diff options
| author |  vnugent <public@vaughnnugent.com> | 2024-01-28 19:23:18 -0500 |
|---|---|---|
| committer | vnugent <public@vaughnnugent.com> | 2024-01-28 19:23:18 -0500 |
| commit | 626a8d8d3df8880991684d6d1a06b82f6685b51a (patch) | |
| tree | 183c981ac44886445240ad1e1945f325ceaa9298 /include/mbedtls/ssl.h | |
initial commit
Diffstat (limited to 'include/mbedtls/ssl.h')
| -rw-r--r-- | include/mbedtls/ssl.h | 5369 |
1 files changed, 5369 insertions, 0 deletions
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h new file mode 100644 index 0000000..89f7b81 --- /dev/null +++ b/include/mbedtls/ssl.h @@ -0,0 +1,5369 @@ +/** + * \file ssl.h + * + * \brief SSL/TLS functions. + */ +/* + * Copyright The Mbed TLS Contributors + * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later + */ +#ifndef MBEDTLS_SSL_H +#define MBEDTLS_SSL_H +#include "mbedtls/platform_util.h" +#include "mbedtls/private_access.h" + +#include "mbedtls/build_info.h" + +#include "mbedtls/bignum.h" +#include "mbedtls/ecp.h" + +#include "mbedtls/ssl_ciphersuites.h" + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +#include "mbedtls/x509_crt.h" +#include "mbedtls/x509_crl.h" +#endif + +#if defined(MBEDTLS_DHM_C) +#include "mbedtls/dhm.h" +#endif + +#include "mbedtls/md.h" + +#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_ANY_ENABLED) +#include "mbedtls/ecdh.h" +#endif + +#if defined(MBEDTLS_HAVE_TIME) +#include "mbedtls/platform_time.h" +#endif + +#include "psa/crypto.h" + +/* + * SSL Error codes + */ +/** A cryptographic operation is in progress. Try again later. */ +#define MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS -0x7000 +/** The requested feature is not available. */ +#define MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE -0x7080 +/** Bad input parameters to function. */ +#define MBEDTLS_ERR_SSL_BAD_INPUT_DATA -0x7100 +/** Verification of the message MAC failed. */ +#define MBEDTLS_ERR_SSL_INVALID_MAC -0x7180 +/** An invalid SSL record was received. */ +#define MBEDTLS_ERR_SSL_INVALID_RECORD -0x7200 +/** The connection indicated an EOF. */ +#define MBEDTLS_ERR_SSL_CONN_EOF -0x7280 +/** A message could not be parsed due to a syntactic error. */ +#define MBEDTLS_ERR_SSL_DECODE_ERROR -0x7300 +/* Error space gap */ +/** No RNG was provided to the SSL module. */ +#define MBEDTLS_ERR_SSL_NO_RNG -0x7400 +/** No client certification received from the client, but required by the authentication mode. */ +#define MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE -0x7480 +/** Client received an extended server hello containing an unsupported extension */ +#define MBEDTLS_ERR_SSL_UNSUPPORTED_EXTENSION -0x7500 +/** No ALPN protocols supported that the client advertises */ +#define MBEDTLS_ERR_SSL_NO_APPLICATION_PROTOCOL -0x7580 +/** The own private key or pre-shared key is not set, but needed. */ +#define MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED -0x7600 +/** No CA Chain is set, but required to operate. */ +#define MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED -0x7680 +/** An unexpected message was received from our peer. */ +#define MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE -0x7700 +/** A fatal alert message was received from our peer. */ +#define MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE -0x7780 +/** No server could be identified matching the client's SNI. */ +#define MBEDTLS_ERR_SSL_UNRECOGNIZED_NAME -0x7800 +/** The peer notified us that the connection is going to be closed. */ +#define MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY -0x7880 +/* Error space gap */ +/* Error space gap */ +/** Processing of the Certificate handshake message failed. */ +#define MBEDTLS_ERR_SSL_BAD_CERTIFICATE -0x7A00 +/* Error space gap */ +/** + * Received NewSessionTicket Post Handshake Message. + * This error code is experimental and may be changed or removed without notice. + */ +#define MBEDTLS_ERR_SSL_RECEIVED_NEW_SESSION_TICKET -0x7B00 +/** Not possible to read early data */ +#define MBEDTLS_ERR_SSL_CANNOT_READ_EARLY_DATA -0x7B80 +/** Not possible to write early data */ +#define MBEDTLS_ERR_SSL_CANNOT_WRITE_EARLY_DATA -0x7C00 +/* Error space gap */ +/* Error space gap */ +/* Error space gap */ +/* Error space gap */ +/** Cache entry not found */ +#define MBEDTLS_ERR_SSL_CACHE_ENTRY_NOT_FOUND -0x7E80 +/** Memory allocation failed */ +#define MBEDTLS_ERR_SSL_ALLOC_FAILED -0x7F00 +/** Hardware acceleration function returned with error */ +#define MBEDTLS_ERR_SSL_HW_ACCEL_FAILED -0x7F80 +/** Hardware acceleration function skipped / left alone data */ +#define MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH -0x6F80 +/** Handshake protocol not within min/max boundaries */ +#define MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION -0x6E80 +/** The handshake negotiation failed. */ +#define MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE -0x6E00 +/** Session ticket has expired. */ +#define MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED -0x6D80 +/** Public key type mismatch (eg, asked for RSA key exchange and presented EC key) */ +#define MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH -0x6D00 +/** Unknown identity received (eg, PSK identity) */ +#define MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY -0x6C80 +/** Internal error (eg, unexpected failure in lower-level module) */ +#define MBEDTLS_ERR_SSL_INTERNAL_ERROR -0x6C00 +/** A counter would wrap (eg, too many messages exchanged). */ +#define MBEDTLS_ERR_SSL_COUNTER_WRAPPING -0x6B80 +/** Unexpected message at ServerHello in renegotiation. */ +#define MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO -0x6B00 +/** DTLS client must retry for hello verification */ +#define MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED -0x6A80 +/** A buffer is too small to receive or write a message */ +#define MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL -0x6A00 +/* Error space gap */ +/** No data of requested type currently available on underlying transport. */ +#define MBEDTLS_ERR_SSL_WANT_READ -0x6900 +/** Connection requires a write call. */ +#define MBEDTLS_ERR_SSL_WANT_WRITE -0x6880 +/** The operation timed out. */ +#define MBEDTLS_ERR_SSL_TIMEOUT -0x6800 +/** The client initiated a reconnect from the same port. */ +#define MBEDTLS_ERR_SSL_CLIENT_RECONNECT -0x6780 +/** Record header looks valid but is not expected. */ +#define MBEDTLS_ERR_SSL_UNEXPECTED_RECORD -0x6700 +/** The alert message received indicates a non-fatal error. */ +#define MBEDTLS_ERR_SSL_NON_FATAL -0x6680 +/** A field in a message was incorrect or inconsistent with other fields. */ +#define MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER -0x6600 +/** Internal-only message signaling that further message-processing should be done */ +#define MBEDTLS_ERR_SSL_CONTINUE_PROCESSING -0x6580 +/** The asynchronous operation is not completed yet. */ +#define MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS -0x6500 +/** Internal-only message signaling that a message arrived early. */ +#define MBEDTLS_ERR_SSL_EARLY_MESSAGE -0x6480 +/* Error space gap */ +/* Error space gap */ +/* Error space gap */ +/* Error space gap */ +/* Error space gap */ +/* Error space gap */ +/* Error space gap */ +/* Error space gap */ +/** An encrypted DTLS-frame with an unexpected CID was received. */ +#define MBEDTLS_ERR_SSL_UNEXPECTED_CID -0x6000 +/** An operation failed due to an unexpected version or configuration. */ +#define MBEDTLS_ERR_SSL_VERSION_MISMATCH -0x5F00 +/** Invalid value in SSL config */ +#define MBEDTLS_ERR_SSL_BAD_CONFIG -0x5E80 + +/* + * Constants from RFC 8446 for TLS 1.3 PSK modes + * + * Those are used in the Pre-Shared Key Exchange Modes extension. + * See Section 4.2.9 in RFC 8446. + */ +#define MBEDTLS_SSL_TLS1_3_PSK_MODE_PURE 0 /* Pure PSK-based exchange */ +#define MBEDTLS_SSL_TLS1_3_PSK_MODE_ECDHE 1 /* PSK+ECDHE-based exchange */ + +/* + * TLS 1.3 NamedGroup values + * + * From RF 8446 + * enum { + * // Elliptic Curve Groups (ECDHE) + * secp256r1(0x0017), secp384r1(0x0018), secp521r1(0x0019), + * x25519(0x001D), x448(0x001E), + * // Finite Field Groups (DHE) + * ffdhe2048(0x0100), ffdhe3072(0x0101), ffdhe4096(0x0102), + * ffdhe6144(0x0103), ffdhe8192(0x0104), + * // Reserved Code Points + * ffdhe_private_use(0x01FC..0x01FF), + * ecdhe_private_use(0xFE00..0xFEFF), + * (0xFFFF) + * } NamedGroup; + * + */ + +/* Elliptic Curve Groups (ECDHE) */ +#define MBEDTLS_SSL_IANA_TLS_GROUP_NONE 0 +#define MBEDTLS_SSL_IANA_TLS_GROUP_SECP192K1 0x0012 +#define MBEDTLS_SSL_IANA_TLS_GROUP_SECP192R1 0x0013 +#define MBEDTLS_SSL_IANA_TLS_GROUP_SECP224K1 0x0014 +#define MBEDTLS_SSL_IANA_TLS_GROUP_SECP224R1 0x0015 +#define MBEDTLS_SSL_IANA_TLS_GROUP_SECP256K1 0x0016 +#define MBEDTLS_SSL_IANA_TLS_GROUP_SECP256R1 0x0017 +#define MBEDTLS_SSL_IANA_TLS_GROUP_SECP384R1 0x0018 +#define MBEDTLS_SSL_IANA_TLS_GROUP_SECP521R1 0x0019 +#define MBEDTLS_SSL_IANA_TLS_GROUP_BP256R1 0x001A +#define MBEDTLS_SSL_IANA_TLS_GROUP_BP384R1 0x001B +#define MBEDTLS_SSL_IANA_TLS_GROUP_BP512R1 0x001C +#define MBEDTLS_SSL_IANA_TLS_GROUP_X25519 0x001D +#define MBEDTLS_SSL_IANA_TLS_GROUP_X448 0x001E +/* Finite Field Groups (DHE) */ +#define MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE2048 0x0100 +#define MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE3072 0x0101 +#define MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE4096 0x0102 +#define MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE6144 0x0103 +#define MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE8192 0x0104 + +/* + * TLS 1.3 Key Exchange Modes + * + * Mbed TLS internal identifiers for use with the SSL configuration API + * mbedtls_ssl_conf_tls13_key_exchange_modes(). + */ + +#define MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK (1u << 0) /*!< Pure-PSK TLS 1.3 key exchange, + * encompassing both externally agreed PSKs + * as well as resumption PSKs. */ +#define MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL (1u << 1) /*!< Pure-Ephemeral TLS 1.3 key exchanges, + * including for example ECDHE and DHE + * key exchanges. */ +#define MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL (1u << 2) /*!< PSK-Ephemeral TLS 1.3 key exchanges, + * using both a PSK and an ephemeral + * key exchange. */ + +/* Convenience macros for sets of key exchanges. */ +#define MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_ALL \ + (MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK | \ + MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL | \ + MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL) /*!< All TLS 1.3 key exchanges */ +#define MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_ALL \ + (MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK | \ + MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL) /*!< All PSK-based TLS 1.3 key exchanges */ +#define MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ALL \ + (MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL | \ + MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL) /*!< All ephemeral TLS 1.3 key exchanges */ + +#define MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_NONE (0) + +/* + * Various constants + */ + +#if !defined(MBEDTLS_DEPRECATED_REMOVED) +/* These are the high and low bytes of ProtocolVersion as defined by: + * - RFC 5246: ProtocolVersion version = { 3, 3 }; // TLS v1.2 + * - RFC 8446: see section 4.2.1 + */ +#define MBEDTLS_SSL_MAJOR_VERSION_3 3 +#define MBEDTLS_SSL_MINOR_VERSION_3 3 /*!< TLS v1.2 */ +#define MBEDTLS_SSL_MINOR_VERSION_4 4 /*!< TLS v1.3 */ +#endif /* MBEDTLS_DEPRECATED_REMOVED */ + +#define MBEDTLS_SSL_TRANSPORT_STREAM 0 /*!< TLS */ +#define MBEDTLS_SSL_TRANSPORT_DATAGRAM 1 /*!< DTLS */ + +#define MBEDTLS_SSL_MAX_HOST_NAME_LEN 255 /*!< Maximum host name defined in RFC 1035 */ +#define MBEDTLS_SSL_MAX_ALPN_NAME_LEN 255 /*!< Maximum size in bytes of a protocol name in alpn ext., RFC 7301 */ + +#define MBEDTLS_SSL_MAX_ALPN_LIST_LEN 65535 /*!< Maximum size in bytes of list in alpn ext., RFC 7301 */ + +/* RFC 6066 section 4, see also mfl_code_to_length in ssl_tls.c + * NONE must be zero so that memset()ing structure to zero works */ +#define MBEDTLS_SSL_MAX_FRAG_LEN_NONE 0 /*!< don't use this extension */ +#define MBEDTLS_SSL_MAX_FRAG_LEN_512 1 /*!< MaxFragmentLength 2^9 */ +#define MBEDTLS_SSL_MAX_FRAG_LEN_1024 2 /*!< MaxFragmentLength 2^10 */ +#define MBEDTLS_SSL_MAX_FRAG_LEN_2048 3 /*!< MaxFragmentLength 2^11 */ +#define MBEDTLS_SSL_MAX_FRAG_LEN_4096 4 /*!< MaxFragmentLength 2^12 */ +#define MBEDTLS_SSL_MAX_FRAG_LEN_INVALID 5 /*!< first invalid value */ + +#define MBEDTLS_SSL_IS_CLIENT 0 +#define MBEDTLS_SSL_IS_SERVER 1 + +#define MBEDTLS_SSL_EXTENDED_MS_DISABLED 0 +#define MBEDTLS_SSL_EXTENDED_MS_ENABLED 1 + +#define MBEDTLS_SSL_CID_DISABLED 0 +#define MBEDTLS_SSL_CID_ENABLED 1 + +#define MBEDTLS_SSL_ETM_DISABLED 0 +#define MBEDTLS_SSL_ETM_ENABLED 1 + +#define MBEDTLS_SSL_COMPRESS_NULL 0 + +#define MBEDTLS_SSL_VERIFY_NONE 0 +#define MBEDTLS_SSL_VERIFY_OPTIONAL 1 +#define MBEDTLS_SSL_VERIFY_REQUIRED 2 +#define MBEDTLS_SSL_VERIFY_UNSET 3 /* Used only for sni_authmode */ + +#define MBEDTLS_SSL_LEGACY_RENEGOTIATION 0 +#define MBEDTLS_SSL_SECURE_RENEGOTIATION 1 + +#define MBEDTLS_SSL_RENEGOTIATION_DISABLED 0 +#define MBEDTLS_SSL_RENEGOTIATION_ENABLED 1 + +#define MBEDTLS_SSL_ANTI_REPLAY_DISABLED 0 +#define MBEDTLS_SSL_ANTI_REPLAY_ENABLED 1 + +#define MBEDTLS_SSL_RENEGOTIATION_NOT_ENFORCED -1 +#define MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT 16 + +#define MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION 0 +#define MBEDTLS_SSL_LEGACY_ALLOW_RENEGOTIATION 1 +#define MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE 2 + +#define MBEDTLS_SSL_TRUNC_HMAC_DISABLED 0 +#define MBEDTLS_SSL_TRUNC_HMAC_ENABLED 1 +#define MBEDTLS_SSL_TRUNCATED_HMAC_LEN 10 /* 80 bits, rfc 6066 section 7 */ + +#define MBEDTLS_SSL_SESSION_TICKETS_DISABLED 0 +#define MBEDTLS_SSL_SESSION_TICKETS_ENABLED 1 + +#define MBEDTLS_SSL_PRESET_DEFAULT 0 +#define MBEDTLS_SSL_PRESET_SUITEB 2 + +#define MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED 1 +#define MBEDTLS_SSL_CERT_REQ_CA_LIST_DISABLED 0 + +#define MBEDTLS_SSL_EARLY_DATA_DISABLED 0 +#define MBEDTLS_SSL_EARLY_DATA_ENABLED 1 + +#define MBEDTLS_SSL_DTLS_SRTP_MKI_UNSUPPORTED 0 +#define MBEDTLS_SSL_DTLS_SRTP_MKI_SUPPORTED 1 + +#define MBEDTLS_SSL_SRV_CIPHERSUITE_ORDER_CLIENT 1 +#define MBEDTLS_SSL_SRV_CIPHERSUITE_ORDER_SERVER 0 + +#if defined(MBEDTLS_SSL_PROTO_TLS1_3) && defined(MBEDTLS_SSL_SESSION_TICKETS) +#if defined(PSA_WANT_ALG_SHA_384) +#define MBEDTLS_SSL_TLS1_3_TICKET_RESUMPTION_KEY_LEN 48 +#elif defined(PSA_WANT_ALG_SHA_256) +#define MBEDTLS_SSL_TLS1_3_TICKET_RESUMPTION_KEY_LEN 32 +#endif +#endif /* MBEDTLS_SSL_PROTO_TLS1_3 && MBEDTLS_SSL_SESSION_TICKETS */ +/* + * Default range for DTLS retransmission timer value, in milliseconds. + * RFC 6347 4.2.4.1 says from 1 second to 60 seconds. + */ +#define MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN 1000 +#define MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX 60000 + +/** + * \name SECTION: Module settings + * + * The configuration options you can set for this module are in this section. + * Either change them in mbedtls_config.h or define them on the compiler command line. + * \{ + */ + +/* + * Maximum fragment length in bytes, + * determines the size of each of the two internal I/O buffers. + * + * Note: the RFC defines the default size of SSL / TLS messages. If you + * change the value here, other clients / servers may not be able to + * communicate with you anymore. Only change this value if you control + * both sides of the connection and have it reduced at both sides, or + * if you're using the Max Fragment Length extension and you know all your + * peers are using it too! + */ +#if !defined(MBEDTLS_SSL_IN_CONTENT_LEN) +#define MBEDTLS_SSL_IN_CONTENT_LEN 16384 +#endif + +#if !defined(MBEDTLS_SSL_OUT_CONTENT_LEN) +#define MBEDTLS_SSL_OUT_CONTENT_LEN 16384 +#endif + +/* + * Maximum number of heap-allocated bytes for the purpose of + * DTLS handshake message reassembly and future message buffering. + */ +#if !defined(MBEDTLS_SSL_DTLS_MAX_BUFFERING) +#define MBEDTLS_SSL_DTLS_MAX_BUFFERING 32768 +#endif + +/* + * Maximum length of CIDs for incoming and outgoing messages. + */ +#if !defined(MBEDTLS_SSL_CID_IN_LEN_MAX) +#define MBEDTLS_SSL_CID_IN_LEN_MAX 32 +#endif + +#if !defined(MBEDTLS_SSL_CID_OUT_LEN_MAX) +#define MBEDTLS_SSL_CID_OUT_LEN_MAX 32 +#endif + +#if !defined(MBEDTLS_SSL_CID_TLS1_3_PADDING_GRANULARITY) +#define MBEDTLS_SSL_CID_TLS1_3_PADDING_GRANULARITY 16 +#endif + +#if !defined(MBEDTLS_SSL_MAX_EARLY_DATA_SIZE) +#define MBEDTLS_SSL_MAX_EARLY_DATA_SIZE 1024 +#endif + +#if !defined(MBEDTLS_SSL_TLS1_3_TICKET_AGE_TOLERANCE) +#define MBEDTLS_SSL_TLS1_3_TICKET_AGE_TOLERANCE 6000 +#endif + +#if !defined(MBEDTLS_SSL_TLS1_3_TICKET_NONCE_LENGTH) +#define MBEDTLS_SSL_TLS1_3_TICKET_NONCE_LENGTH 32 +#endif + +#if !defined(MBEDTLS_SSL_TLS1_3_DEFAULT_NEW_SESSION_TICKETS) +#define MBEDTLS_SSL_TLS1_3_DEFAULT_NEW_SESSION_TICKETS 1 +#endif + +/** \} name SECTION: Module settings */ + +/* + * Default to standard CID mode + */ +#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) && \ + !defined(MBEDTLS_SSL_DTLS_CONNECTION_ID_COMPAT) +#define MBEDTLS_SSL_DTLS_CONNECTION_ID_COMPAT 0 +#endif + +/* + * Length of the verify data for secure renegotiation + */ +#define MBEDTLS_SSL_VERIFY_DATA_MAX_LEN 12 + +/* + * Signaling ciphersuite values (SCSV) + */ +#define MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO 0xFF /**< renegotiation info ext */ + +/* + * Supported Signature and Hash algorithms (For TLS 1.2) + * RFC 5246 section 7.4.1.4.1 + */ +#define MBEDTLS_SSL_HASH_NONE 0 +#define MBEDTLS_SSL_HASH_MD5 1 +#define MBEDTLS_SSL_HASH_SHA1 2 +#define MBEDTLS_SSL_HASH_SHA224 3 +#define MBEDTLS_SSL_HASH_SHA256 4 +#define MBEDTLS_SSL_HASH_SHA384 5 +#define MBEDTLS_SSL_HASH_SHA512 6 + +#define MBEDTLS_SSL_SIG_ANON 0 +#define MBEDTLS_SSL_SIG_RSA 1 +#define MBEDTLS_SSL_SIG_ECDSA 3 + +/* + * TLS 1.3 signature algorithms + * RFC 8446, Section 4.2.2 + */ + +/* RSASSA-PKCS1-v1_5 algorithms */ +#define MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA256 0x0401 +#define MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA384 0x0501 +#define MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA512 0x0601 + +/* ECDSA algorithms */ +#define MBEDTLS_TLS1_3_SIG_ECDSA_SECP256R1_SHA256 0x0403 +#define MBEDTLS_TLS1_3_SIG_ECDSA_SECP384R1_SHA384 0x0503 +#define MBEDTLS_TLS1_3_SIG_ECDSA_SECP521R1_SHA512 0x0603 + +/* RSASSA-PSS algorithms with public key OID rsaEncryption */ +#define MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256 0x0804 +#define MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384 0x0805 +#define MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512 0x0806 + +/* EdDSA algorithms */ +#define MBEDTLS_TLS1_3_SIG_ED25519 0x0807 +#define MBEDTLS_TLS1_3_SIG_ED448 0x0808 + +/* RSASSA-PSS algorithms with public key OID RSASSA-PSS */ +#define MBEDTLS_TLS1_3_SIG_RSA_PSS_PSS_SHA256 0x0809 +#define MBEDTLS_TLS1_3_SIG_RSA_PSS_PSS_SHA384 0x080A +#define MBEDTLS_TLS1_3_SIG_RSA_PSS_PSS_SHA512 0x080B + +/* LEGACY ALGORITHMS */ +#define MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA1 0x0201 +#define MBEDTLS_TLS1_3_SIG_ECDSA_SHA1 0x0203 + +#define MBEDTLS_TLS1_3_SIG_NONE 0x0 + +/* + * Client Certificate Types + * RFC 5246 section 7.4.4 plus RFC 4492 section 5.5 + */ +#define MBEDTLS_SSL_CERT_TYPE_RSA_SIGN 1 +#define MBEDTLS_SSL_CERT_TYPE_ECDSA_SIGN 64 + +/* + * Message, alert and handshake types + */ +#define MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC 20 +#define MBEDTLS_SSL_MSG_ALERT 21 +#define MBEDTLS_SSL_MSG_HANDSHAKE 22 +#define MBEDTLS_SSL_MSG_APPLICATION_DATA 23 +#define MBEDTLS_SSL_MSG_CID 25 + +#define MBEDTLS_SSL_ALERT_LEVEL_WARNING 1 +#define MBEDTLS_SSL_ALERT_LEVEL_FATAL 2 + +#define MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY 0 /* 0x00 */ +#define MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE 10 /* 0x0A */ +#define MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC 20 /* 0x14 */ +#define MBEDTLS_SSL_ALERT_MSG_DECRYPTION_FAILED 21 /* 0x15 */ +#define MBEDTLS_SSL_ALERT_MSG_RECORD_OVERFLOW 22 /* 0x16 */ +#define MBEDTLS_SSL_ALERT_MSG_DECOMPRESSION_FAILURE 30 /* 0x1E */ +#define MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE 40 /* 0x28 */ +#define MBEDTLS_SSL_ALERT_MSG_NO_CERT 41 /* 0x29 */ +#define MBEDTLS_SSL_ALERT_MSG_BAD_CERT 42 /* 0x2A */ +#define MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT 43 /* 0x2B */ +#define MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED 44 /* 0x2C */ +#define MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED 45 /* 0x2D */ +#define MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN 46 /* 0x2E */ +#define MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER 47 /* 0x2F */ +#define MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA 48 /* 0x30 */ +#define MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED 49 /* 0x31 */ +#define MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR 50 /* 0x32 */ +#define MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR 51 /* 0x33 */ +#define MBEDTLS_SSL_ALERT_MSG_EXPORT_RESTRICTION 60 /* 0x3C */ +#define MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION 70 /* 0x46 */ +#define MBEDTLS_SSL_ALERT_MSG_INSUFFICIENT_SECURITY 71 /* 0x47 */ +#define MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR 80 /* 0x50 */ +#define MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK 86 /* 0x56 */ +#define MBEDTLS_SSL_ALERT_MSG_USER_CANCELED 90 /* 0x5A */ +#define MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION 100 /* 0x64 */ +#define MBEDTLS_SSL_ALERT_MSG_MISSING_EXTENSION 109 /* 0x6d -- new in TLS 1.3 */ +#define MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_EXT 110 /* 0x6E */ +#define MBEDTLS_SSL_ALERT_MSG_UNRECOGNIZED_NAME 112 /* 0x70 */ +#define MBEDTLS_SSL_ALERT_MSG_UNKNOWN_PSK_IDENTITY 115 /* 0x73 */ +#define MBEDTLS_SSL_ALERT_MSG_CERT_REQUIRED 116 /* 0x74 */ +#define MBEDTLS_SSL_ALERT_MSG_NO_APPLICATION_PROTOCOL 120 /* 0x78 */ + +#define MBEDTLS_SSL_HS_HELLO_REQUEST 0 +#define MBEDTLS_SSL_HS_CLIENT_HELLO 1 +#define MBEDTLS_SSL_HS_SERVER_HELLO 2 +#define MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST 3 +#define MBEDTLS_SSL_HS_NEW_SESSION_TICKET 4 +#define MBEDTLS_SSL_HS_END_OF_EARLY_DATA 5 +#define MBEDTLS_SSL_HS_ENCRYPTED_EXTENSIONS 8 +#define MBEDTLS_SSL_HS_CERTIFICATE 11 +#define MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE 12 +#define MBEDTLS_SSL_HS_CERTIFICATE_REQUEST 13 +#define MBEDTLS_SSL_HS_SERVER_HELLO_DONE 14 +#define MBEDTLS_SSL_HS_CERTIFICATE_VERIFY 15 +#define MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE 16 +#define MBEDTLS_SSL_HS_FINISHED 20 +#define MBEDTLS_SSL_HS_MESSAGE_HASH 254 + +/* + * TLS extensions + */ +#define MBEDTLS_TLS_EXT_SERVERNAME 0 +#define MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME 0 + +#define MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH 1 + +#define MBEDTLS_TLS_EXT_TRUNCATED_HMAC 4 +#define MBEDTLS_TLS_EXT_STATUS_REQUEST 5 /* RFC 6066 TLS 1.2 and 1.3 */ + +#define MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES 10 +#define MBEDTLS_TLS_EXT_SUPPORTED_GROUPS 10 /* RFC 8422,7919 TLS 1.2 and 1.3 */ +#define MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS 11 + +#define MBEDTLS_TLS_EXT_SIG_ALG 13 /* RFC 8446 TLS 1.3 */ +#define MBEDTLS_TLS_EXT_USE_SRTP 14 +#define MBEDTLS_TLS_EXT_HEARTBEAT 15 /* RFC 6520 TLS 1.2 and 1.3 */ +#define MBEDTLS_TLS_EXT_ALPN 16 + +#define MBEDTLS_TLS_EXT_SCT 18 /* RFC 6962 TLS 1.2 and 1.3 */ +#define MBEDTLS_TLS_EXT_CLI_CERT_TYPE 19 /* RFC 7250 TLS 1.2 and 1.3 */ +#define MBEDTLS_TLS_EXT_SERV_CERT_TYPE 20 /* RFC 7250 TLS 1.2 and 1.3 */ +#define MBEDTLS_TLS_EXT_PADDING 21 /* RFC 7685 TLS 1.2 and 1.3 */ +#define MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC 22 /* 0x16 */ +#define MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET 0x0017 /* 23 */ + +#define MBEDTLS_TLS_EXT_RECORD_SIZE_LIMIT 28 /* RFC 8449 (implemented for TLS 1.3 only) */ + +#define MBEDTLS_TLS_EXT_SESSION_TICKET 35 + +#define MBEDTLS_TLS_EXT_PRE_SHARED_KEY 41 /* RFC 8446 TLS 1.3 */ +#define MBEDTLS_TLS_EXT_EARLY_DATA 42 /* RFC 8446 TLS 1.3 */ +#define MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS 43 /* RFC 8446 TLS 1.3 */ +#define MBEDTLS_TLS_EXT_COOKIE 44 /* RFC 8446 TLS 1.3 */ +#define MBEDTLS_TLS_EXT_PSK_KEY_EXCHANGE_MODES 45 /* RFC 8446 TLS 1.3 */ + +#define MBEDTLS_TLS_EXT_CERT_AUTH 47 /* RFC 8446 TLS 1.3 */ +#define MBEDTLS_TLS_EXT_OID_FILTERS 48 /* RFC 8446 TLS 1.3 */ +#define MBEDTLS_TLS_EXT_POST_HANDSHAKE_AUTH 49 /* RFC 8446 TLS 1.3 */ +#define MBEDTLS_TLS_EXT_SIG_ALG_CERT 50 /* RFC 8446 TLS 1.3 */ +#define MBEDTLS_TLS_EXT_KEY_SHARE 51 /* RFC 8446 TLS 1.3 */ + +#if MBEDTLS_SSL_DTLS_CONNECTION_ID_COMPAT == 0 +#define MBEDTLS_TLS_EXT_CID 54 /* RFC 9146 DTLS 1.2 CID */ +#else +#define MBEDTLS_TLS_EXT_CID 254 /* Pre-RFC 9146 DTLS 1.2 CID */ +#endif + +#define MBEDTLS_TLS_EXT_ECJPAKE_KKPP 256 /* experimental */ + +#define MBEDTLS_TLS_EXT_RENEGOTIATION_INFO 0xFF01 + +/* + * Size defines + */ +#if !defined(MBEDTLS_PSK_MAX_LEN) +/* + * If the library supports TLS 1.3 tickets and the cipher suite + * TLS1-3-AES-256-GCM-SHA384, set the PSK maximum length to 48 instead of 32. + * That way, the TLS 1.3 client and server are able to resume sessions where + * the cipher suite is TLS1-3-AES-256-GCM-SHA384 (pre-shared keys are 48 + * bytes long in that case). + */ +#if defined(MBEDTLS_SSL_PROTO_TLS1_3) && \ + defined(MBEDTLS_SSL_SESSION_TICKETS) && \ + defined(MBEDTLS_AES_C) && defined(MBEDTLS_GCM_C) && \ + defined(MBEDTLS_MD_CAN_SHA384) +#define MBEDTLS_PSK_MAX_LEN 48 /* 384 bits */ +#else +#define MBEDTLS_PSK_MAX_LEN 32 /* 256 bits */ +#endif +#endif /* !MBEDTLS_PSK_MAX_LEN */ + +/* Dummy type used only for its size */ +union mbedtls_ssl_premaster_secret { + unsigned char dummy; /* Make the union non-empty even with SSL disabled */ +#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) + unsigned char _pms_rsa[48]; /* RFC 5246 8.1.1 */ +#endif +#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) + unsigned char _pms_dhm[MBEDTLS_MPI_MAX_SIZE]; /* RFC 5246 8.1.2 */ +#endif +#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) + unsigned char _pms_ecdh[MBEDTLS_ECP_MAX_BYTES]; /* RFC 4492 5.10 */ +#endif +#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) + unsigned char _pms_psk[4 + 2 * MBEDTLS_PSK_MAX_LEN]; /* RFC 4279 2 */ +#endif +#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) + unsigned char _pms_dhe_psk[4 + MBEDTLS_MPI_MAX_SIZE + + MBEDTLS_PSK_MAX_LEN]; /* RFC 4279 3 */ +#endif +#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) + unsigned char _pms_rsa_psk[52 + MBEDTLS_PSK_MAX_LEN]; /* RFC 4279 4 */ +#endif +#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) + unsigned char _pms_ecdhe_psk[4 + MBEDTLS_ECP_MAX_BYTES + + MBEDTLS_PSK_MAX_LEN]; /* RFC 5489 2 */ +#endif +#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) + unsigned char _pms_ecjpake[32]; /* Thread spec: SHA-256 output */ +#endif +}; + +#define MBEDTLS_PREMASTER_SIZE sizeof(union mbedtls_ssl_premaster_secret) + +#define MBEDTLS_TLS1_3_MD_MAX_SIZE PSA_HASH_MAX_SIZE + + +/* Length in number of bytes of the TLS sequence number */ +#define MBEDTLS_SSL_SEQUENCE_NUMBER_LEN 8 + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * SSL state machine + */ +typedef enum { + MBEDTLS_SSL_HELLO_REQUEST, + MBEDTLS_SSL_CLIENT_HELLO, + MBEDTLS_SSL_SERVER_HELLO, + MBEDTLS_SSL_SERVER_CERTIFICATE, + MBEDTLS_SSL_SERVER_KEY_EXCHANGE, + MBEDTLS_SSL_CERTIFICATE_REQUEST, + MBEDTLS_SSL_SERVER_HELLO_DONE, + MBEDTLS_SSL_CLIENT_CERTIFICATE, + MBEDTLS_SSL_CLIENT_KEY_EXCHANGE, + MBEDTLS_SSL_CERTIFICATE_VERIFY, + MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC, + MBEDTLS_SSL_CLIENT_FINISHED, + MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC, + MBEDTLS_SSL_SERVER_FINISHED, + MBEDTLS_SSL_FLUSH_BUFFERS, + MBEDTLS_SSL_HANDSHAKE_WRAPUP, + + MBEDTLS_SSL_NEW_SESSION_TICKET, + MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT, + MBEDTLS_SSL_HELLO_RETRY_REQUEST, + MBEDTLS_SSL_ENCRYPTED_EXTENSIONS, + MBEDTLS_SSL_END_OF_EARLY_DATA, + MBEDTLS_SSL_CLIENT_CERTIFICATE_VERIFY, + MBEDTLS_SSL_CLIENT_CCS_AFTER_SERVER_FINISHED, + MBEDTLS_SSL_CLIENT_CCS_BEFORE_2ND_CLIENT_HELLO, + MBEDTLS_SSL_SERVER_CCS_AFTER_SERVER_HELLO, + MBEDTLS_SSL_CLIENT_CCS_AFTER_CLIENT_HELLO, + MBEDTLS_SSL_SERVER_CCS_AFTER_HELLO_RETRY_REQUEST, + MBEDTLS_SSL_HANDSHAKE_OVER, + MBEDTLS_SSL_TLS1_3_NEW_SESSION_TICKET, + MBEDTLS_SSL_TLS1_3_NEW_SESSION_TICKET_FLUSH, +} +mbedtls_ssl_states; + +/** + * \brief Callback type: send data on the network. + * + * \note That callback may be either blocking or non-blocking. + * + * \param ctx Context for the send callback (typically a file descriptor) + * \param buf Buffer holding the data to send + * \param len Length of the data to send + * + * \return The callback must return the number of bytes sent if any, + * or a non-zero error code. + * If performing non-blocking I/O, \c MBEDTLS_ERR_SSL_WANT_WRITE + * must be returned when the operation would block. + * + * \note The callback is allowed to send fewer bytes than requested. + * It must always return the number of bytes actually sent. + */ +typedef int mbedtls_ssl_send_t(void *ctx, + const unsigned char *buf, + size_t len); + +/** + * \brief Callback type: receive data from the network. + * + * \note That callback may be either blocking or non-blocking. + * + * \param ctx Context for the receive callback (typically a file + * descriptor) + * \param buf Buffer to write the received data to + * \param len Length of the receive buffer + * + * \returns If data has been received, the positive number of bytes received. + * \returns \c 0 if the connection has been closed. + * \returns If performing non-blocking I/O, \c MBEDTLS_ERR_SSL_WANT_READ + * must be returned when the operation would block. + * \returns Another negative error code on other kinds of failures. + * + * \note The callback may receive fewer bytes than the length of the + * buffer. It must always return the number of bytes actually + * received and written to the buffer. + */ +typedef int mbedtls_ssl_recv_t(void *ctx, + unsigned char *buf, + size_t len); + +/** + * \brief Callback type: receive data from the network, with timeout + * + * \note That callback must block until data is received, or the + * timeout delay expires, or the operation is interrupted by a + * signal. + * + * \param ctx Context for the receive callback (typically a file descriptor) + * \param buf Buffer to write the received data to + * \param len Length of the receive buffer + * \param timeout Maximum number of milliseconds to wait for data + * 0 means no timeout (potentially waiting forever) + * + * \return The callback must return the number of bytes received, + * or a non-zero error code: + * \c MBEDTLS_ERR_SSL_TIMEOUT if the operation timed out, + * \c MBEDTLS_ERR_SSL_WANT_READ if interrupted by a signal. + * + * \note The callback may receive fewer bytes than the length of the + * buffer. It must always return the number of bytes actually + * received and written to the buffer. + */ +typedef int mbedtls_ssl_recv_timeout_t(void *ctx, + unsigned char *buf, + size_t len, + uint32_t timeout); +/** + * \brief Callback type: set a pair of timers/delays to watch + * + * \param ctx Context pointer + * \param int_ms Intermediate delay in milliseconds + * \param fin_ms Final delay in milliseconds + * 0 cancels the current timer. + * + * \note This callback must at least store the necessary information + * for the associated \c mbedtls_ssl_get_timer_t callback to + * return correct information. + * + * \note If using an event-driven style of programming, an event must + * be generated when the final delay is passed. The event must + * cause a call to \c mbedtls_ssl_handshake() with the proper + * SSL context to be scheduled. Care must be taken to ensure + * that at most one such call happens at a time. + * + * \note Only one timer at a time must be running. Calling this + * function while a timer is running must cancel it. Cancelled + * timers must not generate any event. + */ +typedef void mbedtls_ssl_set_timer_t(void *ctx, + uint32_t int_ms, + uint32_t fin_ms); + +/** + * \brief Callback type: get status of timers/delays + * + * \param ctx Context pointer + * + * \return This callback must return: + * -1 if cancelled (fin_ms == 0), + * 0 if none of the delays have passed, + * 1 if only the intermediate delay has passed, + * 2 if the final delay has passed. + */ +typedef int mbedtls_ssl_get_timer_t(void *ctx); + +/* Defined below */ +typedef struct mbedtls_ssl_session mbedtls_ssl_session; +typedef struct mbedtls_ssl_context mbedtls_ssl_context; +typedef struct mbedtls_ssl_config mbedtls_ssl_config; + +/* Defined in library/ssl_misc.h */ +typedef struct mbedtls_ssl_transform mbedtls_ssl_transform; +typedef struct mbedtls_ssl_handshake_params mbedtls_ssl_handshake_params; +typedef struct mbedtls_ssl_sig_hash_set_t mbedtls_ssl_sig_hash_set_t; +#if defined(MBEDTLS_X509_CRT_PARSE_C) +typedef struct mbedtls_ssl_key_cert mbedtls_ssl_key_cert; +#endif +#if defined(MBEDTLS_SSL_PROTO_DTLS) +typedef struct mbedtls_ssl_flight_item mbedtls_ssl_flight_item; +#endif + +#if defined(MBEDTLS_SSL_PROTO_TLS1_3) && defined(MBEDTLS_SSL_SESSION_TICKETS) +#define MBEDTLS_SSL_TLS1_3_TICKET_ALLOW_PSK_RESUMPTION \ + MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK /* 1U << 0 */ +#define MBEDTLS_SSL_TLS1_3_TICKET_ALLOW_PSK_EPHEMERAL_RESUMPTION \ + MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL /* 1U << 2 */ +#define MBEDTLS_SSL_TLS1_3_TICKET_ALLOW_EARLY_DATA (1U << 3) + +#define MBEDTLS_SSL_TLS1_3_TICKET_FLAGS_MASK \ + (MBEDTLS_SSL_TLS1_3_TICKET_ALLOW_PSK_RESUMPTION | \ + MBEDTLS_SSL_TLS1_3_TICKET_ALLOW_PSK_EPHEMERAL_RESUMPTION | \ + MBEDTLS_SSL_TLS1_3_TICKET_ALLOW_EARLY_DATA) +#endif /* MBEDTLS_SSL_PROTO_TLS1_3 && MBEDTLS_SSL_SESSION_TICKETS */ + +/** + * \brief Callback type: server-side session cache getter + * + * The session cache is logically a key value store, with + * keys being session IDs and values being instances of + * mbedtls_ssl_session. + * + * This callback retrieves an entry in this key-value store. + * + * \param data The address of the session cache structure to query. + * \param session_id The buffer holding the session ID to query. + * \param session_id_len The length of \p session_id in Bytes. + * \param session The address of the session structure to populate. + * It is initialized with mbdtls_ssl_session_init(), + * and the callback must always leave it in a state + * where it can safely be freed via + * mbedtls_ssl_session_free() independent of the + * return code of this function. + * + * \return \c 0 on success + * \return A non-zero return value on failure. + * + */ +typedef int mbedtls_ssl_cache_get_t(void *data, + unsigned char const *session_id, + size_t session_id_len, + mbedtls_ssl_session *session); +/** + * \brief Callback type: server-side session cache setter + * + * The session cache is logically a key value store, with + * keys being session IDs and values being instances of + * mbedtls_ssl_session. + * + * This callback sets an entry in this key-value store. + * + * \param data The address of the session cache structure to modify. + * \param session_id The buffer holding the session ID to query. + * \param session_id_len The length of \p session_id in Bytes. + * \param session The address of the session to be stored in the + * session cache. + * + * \return \c 0 on success + * \return A non-zero return value on failure. + */ +typedef int mbedtls_ssl_cache_set_t(void *data, + unsigned char const *session_id, + size_t session_id_len, + const mbedtls_ssl_session *session); + +#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) +#if defined(MBEDTLS_X509_CRT_PARSE_C) +/** + * \brief Callback type: start external signature operation. + * + * This callback is called during an SSL handshake to start + * a signature decryption operation using an + * external processor. The parameter \p cert contains + * the public key; it is up to the callback function to + * determine how to access the associated private key. + * + * This function typically sends or enqueues a request, and + * does not wait for the operation to complete. This allows + * the handshake step to be non-blocking. + * + * The parameters \p ssl and \p cert are guaranteed to remain + * valid throughout the handshake. On the other hand, this + * function must save the contents of \p hash if the value + * is needed for later processing, because the \p hash buffer + * is no longer valid after this function returns. + * + * This function may call mbedtls_ssl_set_async_operation_data() + * to store an operation context for later retrieval + * by the resume or cancel callback. + * + * \note For RSA signatures, this function must produce output + * that is consistent with PKCS#1 v1.5 in the same way as + * mbedtls_rsa_pkcs1_sign(). Before the private key operation, + * apply the padding steps described in RFC 8017, section 9.2 + * "EMSA-PKCS1-v1_5" as follows. + * - If \p md_alg is #MBEDTLS_MD_NONE, apply the PKCS#1 v1.5 + * encoding, treating \p hash as the DigestInfo to be + * padded. In other words, apply EMSA-PKCS1-v1_5 starting + * from step 3, with `T = hash` and `tLen = hash_len`. + * - If `md_alg != MBEDTLS_MD_NONE`, apply the PKCS#1 v1.5 + * encoding, treating \p hash as the hash to be encoded and + * padded. In other words, apply EMSA-PKCS1-v1_5 starting + * from step 2, with `digestAlgorithm` obtained by calling + * mbedtls_oid_get_oid_by_md() on \p md_alg. + * + * \note For ECDSA signatures, the output format is the DER encoding + * `Ecdsa-Sig-Value` defined in + * [RFC 4492 section 5.4](https://tools.ietf.org/html/rfc4492#section-5.4). + * + * \param ssl The SSL connection instance. It should not be + * modified other than via + * mbedtls_ssl_set_async_operation_data(). + * \param cert Certificate containing the public key. + * In simple cases, this is one of the pointers passed to + * mbedtls_ssl_conf_own_cert() when configuring the SSL + * connection. However, if other callbacks are used, this + * property may not hold. For example, if an SNI callback + * is registered with mbedtls_ssl_conf_sni(), then + * this callback determines what certificate is used. + * \param md_alg Hash algorithm. + * \param hash Buffer containing the hash. This buffer is + * no longer valid when the function returns. + * \param hash_len Size of the \c hash buffer in bytes. + * + * \return 0 if the operation was started successfully and the SSL + * stack should call the resume callback immediately. + * \return #MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS if the operation + * was started successfully and the SSL stack should return + * immediately without calling the resume callback yet. + * \return #MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH if the external + * processor does not support this key. The SSL stack will + * use the private key object instead. + * \return Any other error indicates a fatal failure and is + * propagated up the call chain. The callback should + * use \c MBEDTLS_ERR_PK_xxx error codes, and <b>must not</b> + * use \c MBEDTLS_ERR_SSL_xxx error codes except as + * directed in the documentation of this callback. + */ +typedef int mbedtls_ssl_async_sign_t(mbedtls_ssl_context *ssl, + mbedtls_x509_crt *cert, + mbedtls_md_type_t md_alg, + const unsigned char *hash, + size_t hash_len); + +/** + * \brief Callback type: start external decryption operation. + * + * This callback is called during an SSL handshake to start + * an RSA decryption operation using an + * external processor. The parameter \p cert contains + * the public key; it is up to the callback function to + * determine how to access the associated private key. + * + * This function typically sends or enqueues a request, and + * does not wait for the operation to complete. This allows + * the handshake step to be non-blocking. + * + * The parameters \p ssl and \p cert are guaranteed to remain + * valid throughout the handshake. On the other hand, this + * function must save the contents of \p input if the value + * is needed for later processing, because the \p input buffer + * is no longer valid after this function returns. + * + * This function may call mbedtls_ssl_set_async_operation_data() + * to store an operation context for later retrieval + * by the resume or cancel callback. + * + * \warning RSA decryption as used in TLS is subject to a potential + * timing side channel attack first discovered by Bleichenbacher + * in 1998. This attack can be remotely exploitable + * in practice. To avoid this attack, you must ensure that + * if the callback performs an RSA decryption, the time it + * takes to execute and return the result does not depend + * on whether the RSA decryption succeeded or reported + * invalid padding. + * + * \param ssl The SSL connection instance. It should not be + * modified other than via + * mbedtls_ssl_set_async_operation_data(). + * \param cert Certificate containing the public key. + * In simple cases, this is one of the pointers passed to + * mbedtls_ssl_conf_own_cert() when configuring the SSL + * connection. However, if other callbacks are used, this + * property may not hold. For example, if an SNI callback + * is registered with mbedtls_ssl_conf_sni(), then + * this callback determines what certificate is used. + * \param input Buffer containing the input ciphertext. This buffer + * is no longer valid when the function returns. + * \param input_len Size of the \p input buffer in bytes. + * + * \return 0 if the operation was started successfully and the SSL + * stack should call the resume callback immediately. + * \return #MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS if the operation + * was started successfully and the SSL stack should return + * immediately without calling the resume callback yet. + * \return #MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH if the external + * processor does not support this key. The SSL stack will + * use the private key object instead. + * \return Any other error indicates a fatal failure and is + * propagated up the call chain. The callback should + * use \c MBEDTLS_ERR_PK_xxx error codes, and <b>must not</b> + * use \c MBEDTLS_ERR_SSL_xxx error codes except as + * directed in the documentation of this callback. + */ +typedef int mbedtls_ssl_async_decrypt_t(mbedtls_ssl_context *ssl, + mbedtls_x509_crt *cert, + const unsigned char *input, + size_t input_len); +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +/** + * \brief Callback type: resume external operation. + * + * This callback is called during an SSL handshake to resume + * an external operation started by the + * ::mbedtls_ssl_async_sign_t or + * ::mbedtls_ssl_async_decrypt_t callback. + * + * This function typically checks the status of a pending + * request or causes the request queue to make progress, and + * does not wait for the operation to complete. This allows + * the handshake step to be non-blocking. + * + * This function may call mbedtls_ssl_get_async_operation_data() + * to retrieve an operation context set by the start callback. + * It may call mbedtls_ssl_set_async_operation_data() to modify + * this context. + * + * Note that when this function returns a status other than + * #MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS, it must free any + * resources associated with the operation. + * + * \param ssl The SSL connection instance. It should not be + * modified other than via + * mbedtls_ssl_set_async_operation_data(). + * \param output Buffer containing the output (signature or decrypted + * data) on success. + * \param output_len On success, number of bytes written to \p output. + * \param output_size Size of the \p output buffer in bytes. + * + * \return 0 if output of the operation is available in the + * \p output buffer. + * \return #MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS if the operation + * is still in progress. Subsequent requests for progress + * on the SSL connection will call the resume callback + * again. + * \return Any other error means that the operation is aborted. + * The SSL handshake is aborted. The callback should + * use \c MBEDTLS_ERR_PK_xxx error codes, and <b>must not</b> + * use \c MBEDTLS_ERR_SSL_xxx error codes except as + * directed in the documentation of this callback. + */ +typedef int mbedtls_ssl_async_resume_t(mbedtls_ssl_context *ssl, + unsigned char *output, + size_t *output_len, + size_t output_size); + +/** + * \brief Callback type: cancel external operation. + * + * This callback is called if an SSL connection is closed + * while an asynchronous operation is in progress. Note that + * this callback is not called if the + * ::mbedtls_ssl_async_resume_t callback has run and has + * returned a value other than + * #MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS, since in that case + * the asynchronous operation has already completed. + * + * This function may call mbedtls_ssl_get_async_operation_data() + * to retrieve an operation context set by the start callback. + * + * \param ssl The SSL connection instance. It should not be + * modified. + */ +typedef void mbedtls_ssl_async_cancel_t(mbedtls_ssl_context *ssl); +#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ + +#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) && \ + !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) +#define MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN 48 +#if defined(MBEDTLS_MD_CAN_SHA256) +#define MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE MBEDTLS_MD_SHA256 +#define MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN 32 +#elif defined(MBEDTLS_MD_CAN_SHA384) +#define MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE MBEDTLS_MD_SHA384 +#define MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN 48 +#elif defined(MBEDTLS_MD_CAN_SHA1) +#define MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE MBEDTLS_MD_SHA1 +#define MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN 20 +#else +/* This is already checked in check_config.h, but be sure. */ +#error "Bad configuration - need SHA-1, SHA-256 or SHA-512 enabled to compute digest of peer CRT." +#endif +#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED && + !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ + +typedef struct { + unsigned char client_application_traffic_secret_N[MBEDTLS_TLS1_3_MD_MAX_SIZE]; + unsigned char server_application_traffic_secret_N[MBEDTLS_TLS1_3_MD_MAX_SIZE]; + unsigned char exporter_master_secret[MBEDTLS_TLS1_3_MD_MAX_SIZE]; + unsigned char resumption_master_secret[MBEDTLS_TLS1_3_MD_MAX_SIZE]; +} mbedtls_ssl_tls13_application_secrets; + +#if defined(MBEDTLS_SSL_DTLS_SRTP) + +#define MBEDTLS_TLS_SRTP_MAX_MKI_LENGTH 255 +#define MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH 4 +/* + * For code readability use a typedef for DTLS-SRTP profiles + * + * Use_srtp extension protection profiles values as defined in + * http://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml + * + * Reminder: if this list is expanded mbedtls_ssl_check_srtp_profile_value + * must be updated too. + */ +#define MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_80 ((uint16_t) 0x0001) +#define MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_32 ((uint16_t) 0x0002) +#define MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_80 ((uint16_t) 0x0005) +#define MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_32 ((uint16_t) 0x0006) +/* This one is not iana defined, but for code readability. */ +#define MBEDTLS_TLS_SRTP_UNSET ((uint16_t) 0x0000) + +typedef uint16_t mbedtls_ssl_srtp_profile; + +typedef struct mbedtls_dtls_srtp_info_t { + /*! The SRTP profile that was negotiated. */ + mbedtls_ssl_srtp_profile MBEDTLS_PRIVATE(chosen_dtls_srtp_profile); + /*! The length of mki_value. */ + uint16_t MBEDTLS_PRIVATE(mki_len); + /*! The mki_value used, with max size of 256 bytes. */ + unsigned char MBEDTLS_PRIVATE(mki_value)[MBEDTLS_TLS_SRTP_MAX_MKI_LENGTH]; +} +mbedtls_dtls_srtp_info; + +#endif /* MBEDTLS_SSL_DTLS_SRTP */ + +/** Human-friendly representation of the (D)TLS protocol version. */ +typedef enum { + MBEDTLS_SSL_VERSION_UNKNOWN, /*!< Context not in use or version not yet negotiated. */ + MBEDTLS_SSL_VERSION_TLS1_2 = 0x0303, /*!< (D)TLS 1.2 */ + MBEDTLS_SSL_VERSION_TLS1_3 = 0x0304, /*!< (D)TLS 1.3 */ +} mbedtls_ssl_protocol_version; + +/* + * This structure is used for storing current session data. + * + * Note: when changing this definition, we need to check and update: + * - in tests/suites/test_suite_ssl.function: + * ssl_populate_session() and ssl_serialize_session_save_load() + * - in library/ssl_tls.c: + * mbedtls_ssl_session_init() and mbedtls_ssl_session_free() + * mbedtls_ssl_session_save() and ssl_session_load() + * ssl_session_copy() + */ +struct mbedtls_ssl_session { +#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) + unsigned char MBEDTLS_PRIVATE(mfl_code); /*!< MaxFragmentLength negotiated by peer */ +#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ + + unsigned char MBEDTLS_PRIVATE(exported); + + /** TLS version negotiated in the session. Used if and when renegotiating + * or resuming a session instead of the configured minor TLS version. + */ + mbedtls_ssl_protocol_version MBEDTLS_PRIVATE(tls_version); + +#if defined(MBEDTLS_HAVE_TIME) + mbedtls_time_t MBEDTLS_PRIVATE(start); /*!< starting time */ +#endif + int MBEDTLS_PRIVATE(ciphersuite); /*!< chosen ciphersuite */ + size_t MBEDTLS_PRIVATE(id_len); /*!< session id length */ + unsigned char MBEDTLS_PRIVATE(id)[32]; /*!< session identifier */ + unsigned char MBEDTLS_PRIVATE(master)[48]; /*!< the master secret */ + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) + mbedtls_x509_crt *MBEDTLS_PRIVATE(peer_cert); /*!< peer X.509 cert chain */ +#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ + /*! The digest of the peer's end-CRT. This must be kept to detect CRT + * changes during renegotiation, mitigating the triple handshake attack. */ + unsigned char *MBEDTLS_PRIVATE(peer_cert_digest); + size_t MBEDTLS_PRIVATE(peer_cert_digest_len); + mbedtls_md_type_t MBEDTLS_PRIVATE(peer_cert_digest_type); +#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + uint32_t MBEDTLS_PRIVATE(verify_result); /*!< verification result */ + +#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) + unsigned char *MBEDTLS_PRIVATE(ticket); /*!< RFC 5077 session ticket */ + size_t MBEDTLS_PRIVATE(ticket_len); /*!< session ticket length */ + uint32_t MBEDTLS_PRIVATE(ticket_lifetime); /*!< ticket lifetime hint */ +#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ + +#if defined(MBEDTLS_SSL_PROTO_TLS1_3) && defined(MBEDTLS_SSL_SESSION_TICKETS) + uint8_t MBEDTLS_PRIVATE(endpoint); /*!< 0: client, 1: server */ + uint8_t MBEDTLS_PRIVATE(ticket_flags); /*!< Ticket flags */ + uint32_t MBEDTLS_PRIVATE(ticket_age_add); /*!< Randomly generated value used to obscure the age of the ticket */ + uint8_t MBEDTLS_PRIVATE(resumption_key_len); /*!< resumption_key length */ + unsigned char MBEDTLS_PRIVATE(resumption_key)[MBEDTLS_SSL_TLS1_3_TICKET_RESUMPTION_KEY_LEN]; + +#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) && defined(MBEDTLS_SSL_CLI_C) + char *MBEDTLS_PRIVATE(hostname); /*!< host name binded with tickets */ +#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION && MBEDTLS_SSL_CLI_C */ + +#if defined(MBEDTLS_HAVE_TIME) && defined(MBEDTLS_SSL_CLI_C) + mbedtls_time_t MBEDTLS_PRIVATE(ticket_received); /*!< time ticket was received */ +#endif /* MBEDTLS_HAVE_TIME && MBEDTLS_SSL_CLI_C */ + +#endif /* MBEDTLS_SSL_PROTO_TLS1_3 && MBEDTLS_SSL_SESSION_TICKETS */ + +#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) + int MBEDTLS_PRIVATE(encrypt_then_mac); /*!< flag for EtM activation */ +#endif + +#if defined(MBEDTLS_SSL_PROTO_TLS1_3) + mbedtls_ssl_tls13_application_secrets MBEDTLS_PRIVATE(app_secrets); +#endif +}; + +/* + * Identifiers for PRFs used in various versions of TLS. + */ +typedef enum { + MBEDTLS_SSL_TLS_PRF_NONE, + MBEDTLS_SSL_TLS_PRF_SHA384, + MBEDTLS_SSL_TLS_PRF_SHA256, + MBEDTLS_SSL_HKDF_EXPAND_SHA384, + MBEDTLS_SSL_HKDF_EXPAND_SHA256 +} +mbedtls_tls_prf_types; + +typedef enum { + MBEDTLS_SSL_KEY_EXPORT_TLS12_MASTER_SECRET = 0, +#if defined(MBEDTLS_SSL_PROTO_TLS1_3) + MBEDTLS_SSL_KEY_EXPORT_TLS1_3_CLIENT_EARLY_SECRET, + MBEDTLS_SSL_KEY_EXPORT_TLS1_3_EARLY_EXPORTER_SECRET, + MBEDTLS_SSL_KEY_EXPORT_TLS1_3_CLIENT_HANDSHAKE_TRAFFIC_SECRET, + MBEDTLS_SSL_KEY_EXPORT_TLS1_3_SERVER_HANDSHAKE_TRAFFIC_SECRET, + MBEDTLS_SSL_KEY_EXPORT_TLS1_3_CLIENT_APPLICATION_TRAFFIC_SECRET, + MBEDTLS_SSL_KEY_EXPORT_TLS1_3_SERVER_APPLICATION_TRAFFIC_SECRET, +#endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ +} mbedtls_ssl_key_export_type; + +/** + * \brief Callback type: Export key alongside random values for + * session identification, and PRF for + * implementation of TLS key exporters. + * + * \param p_expkey Context for the callback. + * \param type The type of the key that is being exported. + * \param secret The address of the buffer holding the secret + * that's being exporterd. + * \param secret_len The length of \p secret in bytes. + * \param client_random The client random bytes. + * \param server_random The server random bytes. + * \param tls_prf_type The identifier for the PRF used in the handshake + * to which the key belongs. + */ +typedef void mbedtls_ssl_export_keys_t(void *p_expkey, + mbedtls_ssl_key_export_type type, + const unsigned char *secret, + size_t secret_len, + const unsigned char client_random[32], + const unsigned char server_random[32], + mbedtls_tls_prf_types tls_prf_type); + +#if defined(MBEDTLS_SSL_SRV_C) +/** + * \brief Callback type: generic handshake callback + * + * \note Callbacks may use user_data funcs to set/get app user data. + * See \c mbedtls_ssl_get_user_data_p() + * \c mbedtls_ssl_get_user_data_n() + * \c mbedtls_ssl_conf_get_user_data_p() + * \c mbedtls_ssl_conf_get_user_data_n() + * + * \param ssl \c mbedtls_ssl_context on which the callback is run + * + * \return The return value of the callback is 0 if successful, + * or a specific MBEDTLS_ERR_XXX code, which will cause + * the handshake to be aborted. + */ +typedef int (*mbedtls_ssl_hs_cb_t)(mbedtls_ssl_context *ssl); +#endif + +/* A type for storing user data in a library structure. + * + * The representation of type may change in future versions of the library. + * Only the behaviors guaranteed by documented accessor functions are + * guaranteed to remain stable. + */ +typedef union { + uintptr_t n; /* typically a handle to an associated object */ + void *p; /* typically a pointer to extra data */ +} mbedtls_ssl_user_data_t; + +/** + * SSL/TLS configuration to be shared between mbedtls_ssl_context structures. + */ +struct mbedtls_ssl_config { + /* Group items mostly by size. This helps to reduce memory wasted to + * padding. It also helps to keep smaller fields early in the structure, + * so that elements tend to be in the 128-element direct access window + * on Arm Thumb, which reduces the code size. */ + + mbedtls_ssl_protocol_version MBEDTLS_PRIVATE(max_tls_version); /*!< max. TLS version used */ + mbedtls_ssl_protocol_version MBEDTLS_PRIVATE(min_tls_version); /*!< min. TLS version used */ + + /* + * Flags (could be bit-fields to save RAM, but separate bytes make + * the code smaller on architectures with an instruction for direct + * byte access). + */ + + uint8_t MBEDTLS_PRIVATE(endpoint); /*!< 0: client, 1: server */ + uint8_t MBEDTLS_PRIVATE(transport); /*!< 0: stream (TLS), 1: datagram (DTLS) */ + uint8_t MBEDTLS_PRIVATE(authmode); /*!< MBEDTLS_SSL_VERIFY_XXX */ + /* needed even with renego disabled for LEGACY_BREAK_HANDSHAKE */ + uint8_t MBEDTLS_PRIVATE(allow_legacy_renegotiation); /*!< MBEDTLS_LEGACY_XXX */ +#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) + uint8_t MBEDTLS_PRIVATE(mfl_code); /*!< desired fragment length indicator + (MBEDTLS_SSL_MAX_FRAG_LEN_XXX) */ +#endif +#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) + uint8_t MBEDTLS_PRIVATE(encrypt_then_mac); /*!< negotiate encrypt-then-mac? */ +#endif +#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) + uint8_t MBEDTLS_PRIVATE(extended_ms); /*!< negotiate extended master secret? */ +#endif +#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) + uint8_t MBEDTLS_PRIVATE(anti_replay); /*!< detect and prevent replay? */ +#endif +#if defined(MBEDTLS_SSL_RENEGOTIATION) + uint8_t MBEDTLS_PRIVATE(disable_renegotiation); /*!< disable renegotiation? */ +#endif +#if defined(MBEDTLS_SSL_SESSION_TICKETS) && \ + defined(MBEDTLS_SSL_CLI_C) + uint8_t MBEDTLS_PRIVATE(session_tickets); /*!< use session tickets? */ +#endif + +#if defined(MBEDTLS_SSL_SESSION_TICKETS) && \ + defined(MBEDTLS_SSL_SRV_C) && \ + defined(MBEDTLS_SSL_PROTO_TLS1_3) + uint16_t MBEDTLS_PRIVATE(new_session_tickets_count); /*!< number of NewSessionTicket */ +#endif + +#if defined(MBEDTLS_SSL_SRV_C) + uint8_t MBEDTLS_PRIVATE(cert_req_ca_list); /*!< enable sending CA list in + Certificate Request messages? */ + uint8_t MBEDTLS_PRIVATE(respect_cli_pref); /*!< pick the ciphersuite according to + the client's preferences rather + than ours? */ +#endif +#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) + uint8_t MBEDTLS_PRIVATE(ignore_unexpected_cid); /*!< Should DTLS record with + * unexpected CID + * lead to failure? */ +#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ +#if defined(MBEDTLS_SSL_DTLS_SRTP) + uint8_t MBEDTLS_PRIVATE(dtls_srtp_mki_support); /* support having mki_value + in the use_srtp extension? */ +#endif + + /* + * Pointers + */ + + /** Allowed ciphersuites for (D)TLS 1.2 (0-terminated) */ + const int *MBEDTLS_PRIVATE(ciphersuite_list); + +#if defined(MBEDTLS_SSL_PROTO_TLS1_3) + /** Allowed TLS 1.3 key exchange modes. */ + int MBEDTLS_PRIVATE(tls13_kex_modes); +#endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ + + /** Callback for printing debug output */ + void(*MBEDTLS_PRIVATE(f_dbg))(void *, int, const char *, int, const char *); + void *MBEDTLS_PRIVATE(p_dbg); /*!< context for the debug function */ + + /** Callback for getting (pseudo-)random numbers */ + int(*MBEDTLS_PRIVATE(f_rng))(void *, unsigned char *, size_t); + void *MBEDTLS_PRIVATE(p_rng); /*!< context for the RNG function */ + + /** Callback to retrieve a session from the cache */ + mbedtls_ssl_cache_get_t *MBEDTLS_PRIVATE(f_get_cache); + /** Callback to store a session into the cache */ + mbedtls_ssl_cache_set_t *MBEDTLS_PRIVATE(f_set_cache); + void *MBEDTLS_PRIVATE(p_cache); /*!< context for cache callbacks */ + +#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) + /** Callback for setting cert according to SNI extension */ + int(*MBEDTLS_PRIVATE(f_sni))(void *, mbedtls_ssl_context *, const unsigned char *, size_t); + void *MBEDTLS_PRIVATE(p_sni); /*!< context for SNI callback */ +#endif + +#if defined(MBEDTLS_X509_CRT_PARSE_C) + /** Callback to customize X.509 certificate chain verification */ + int(*MBEDTLS_PRIVATE(f_vrfy))(void *, mbedtls_x509_crt *, int, uint32_t *); + void *MBEDTLS_PRIVATE(p_vrfy); /*!< context for X.509 verify calllback */ +#endif + +#if defined(MBEDTLS_SSL_HANDSHAKE_WITH_PSK_ENABLED) +#if defined(MBEDTLS_SSL_SRV_C) + /** Callback to retrieve PSK key from identity */ + int(*MBEDTLS_PRIVATE(f_psk))(void *, mbedtls_ssl_context *, const unsigned char *, size_t); + void *MBEDTLS_PRIVATE(p_psk); /*!< context for PSK callback */ +#endif +#endif + +#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) + /** Callback to create & write a cookie for ClientHello verification */ + int(*MBEDTLS_PRIVATE(f_cookie_write))(void *, unsigned char **, unsigned char *, + const unsigned char *, size_t); + /** Callback to verify validity of a ClientHello cookie */ + int(*MBEDTLS_PRIVATE(f_cookie_check))(void *, const unsigned char *, size_t, + const unsigned char *, size_t); + void *MBEDTLS_PRIVATE(p_cookie); /*!< context for the cookie callbacks */ +#endif + +#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_SRV_C) + /** Callback to create & write a session ticket */ + int(*MBEDTLS_PRIVATE(f_ticket_write))(void *, const mbedtls_ssl_session *, + unsigned char *, const unsigned char *, size_t *, + uint32_t *); + /** Callback to parse a session ticket into a session structure */ + int(*MBEDTLS_PRIVATE(f_ticket_parse))(void *, mbedtls_ssl_session *, unsigned char *, size_t); + void *MBEDTLS_PRIVATE(p_ticket); /*!< context for the ticket callbacks */ +#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_SRV_C */ +#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) + size_t MBEDTLS_PRIVATE(cid_len); /*!< The length of CIDs for incoming DTLS records. */ +#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ + +#if defined(MBEDTLS_X509_CRT_PARSE_C) + const mbedtls_x509_crt_profile *MBEDTLS_PRIVATE(cert_profile); /*!< verification profile */ + mbedtls_ssl_key_cert *MBEDTLS_PRIVATE(key_cert); /*!< own certificate/key pair(s) */ + mbedtls_x509_crt *MBEDTLS_PRIVATE(ca_chain); /*!< trusted CAs */ + mbedtls_x509_crl *MBEDTLS_PRIVATE(ca_crl); /*!< trusted CAs CRLs */ +#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) + mbedtls_x509_crt_ca_cb_t MBEDTLS_PRIVATE(f_ca_cb); + void *MBEDTLS_PRIVATE(p_ca_cb); +#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) +#if defined(MBEDTLS_X509_CRT_PARSE_C) + mbedtls_ssl_async_sign_t *MBEDTLS_PRIVATE(f_async_sign_start); /*!< start asynchronous signature operation */ + mbedtls_ssl_async_decrypt_t *MBEDTLS_PRIVATE(f_async_decrypt_start); /*!< start asynchronous decryption operation */ +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + mbedtls_ssl_async_resume_t *MBEDTLS_PRIVATE(f_async_resume); /*!< resume asynchronous operation */ + mbedtls_ssl_async_cancel_t *MBEDTLS_PRIVATE(f_async_cancel); /*!< cancel asynchronous operation */ + void *MBEDTLS_PRIVATE(p_async_config_data); /*!< Configuration data set by mbedtls_ssl_conf_async_private_cb(). */ +#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ + +#if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED) + +#if !defined(MBEDTLS_DEPRECATED_REMOVED) + const int *MBEDTLS_PRIVATE(sig_hashes); /*!< allowed signature hashes */ +#endif + const uint16_t *MBEDTLS_PRIVATE(sig_algs); /*!< allowed signature algorithms */ +#endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */ + +#if defined(MBEDTLS_ECP_C) && !defined(MBEDTLS_DEPRECATED_REMOVED) + const mbedtls_ecp_group_id *MBEDTLS_PRIVATE(curve_list); /*!< allowed curves */ +#endif + + const uint16_t *MBEDTLS_PRIVATE(group_list); /*!< allowed IANA NamedGroups */ + +#if defined(MBEDTLS_DHM_C) + mbedtls_mpi MBEDTLS_PRIVATE(dhm_P); /*!< prime modulus for DHM */ + mbedtls_mpi MBEDTLS_PRIVATE(dhm_G); /*!< generator for DHM */ +#endif + +#if defined(MBEDTLS_SSL_HANDSHAKE_WITH_PSK_ENABLED) + +#if defined(MBEDTLS_USE_PSA_CRYPTO) + mbedtls_svc_key_id_t MBEDTLS_PRIVATE(psk_opaque); /*!< PSA key slot holding opaque PSK. This field + * should only be set via + * mbedtls_ssl_conf_psk_opaque(). + * If either no PSK or a raw PSK have been + * configured, this has value \c 0. + */ +#endif /* MBEDTLS_USE_PSA_CRYPTO */ + unsigned char *MBEDTLS_PRIVATE(psk); /*!< The raw pre-shared key. This field should + * only be set via mbedtls_ssl_conf_psk(). + * If either no PSK or an opaque PSK + * have been configured, this has value NULL. */ + size_t MBEDTLS_PRIVATE(psk_len); /*!< The length of the raw pre-shared key. + * This field should only be set via + * mbedtls_ssl_conf_psk(). + * Its value is non-zero if and only if + * \c psk is not \c NULL. */ + + unsigned char *MBEDTLS_PRIVATE(psk_identity); /*!< The PSK identity for PSK negotiation. + * This field should only be set via + * mbedtls_ssl_conf_psk(). + * This is set if and only if either + * \c psk or \c psk_opaque are set. */ + size_t MBEDTLS_PRIVATE(psk_identity_len);/*!< The length of PSK identity. + * This field should only be set via + * mbedtls_ssl_conf_psk(). + * Its value is non-zero if and only if + * \c psk is not \c NULL or \c psk_opaque + * is not \c 0. */ +#endif /* MBEDTLS_SSL_HANDSHAKE_WITH_PSK_ENABLED */ + +#if defined(MBEDTLS_SSL_EARLY_DATA) + int MBEDTLS_PRIVATE(early_data_enabled); /*!< Early data enablement: + * - MBEDTLS_SSL_EARLY_DATA_DISABLED, + * - MBEDTLS_SSL_EARLY_DATA_ENABLED */ + +#if defined(MBEDTLS_SSL_SRV_C) + /* The maximum amount of 0-RTT data. RFC 8446 section 4.6.1 */ + uint32_t MBEDTLS_PRIVATE(max_early_data_size); +#endif /* MBEDTLS_SSL_SRV_C */ + +#endif /* MBEDTLS_SSL_EARLY_DATA */ + +#if defined(MBEDTLS_SSL_ALPN) + const char **MBEDTLS_PRIVATE(alpn_list); /*!< ordered list of protocols */ +#endif + +#if defined(MBEDTLS_SSL_DTLS_SRTP) + /*! ordered list of supported srtp profile */ + const mbedtls_ssl_srtp_profile *MBEDTLS_PRIVATE(dtls_srtp_profile_list); + /*! number of supported profiles */ + size_t MBEDTLS_PRIVATE(dtls_srtp_profile_list_len); +#endif /* MBEDTLS_SSL_DTLS_SRTP */ + + /* + * Numerical settings (int) + */ + + uint32_t MBEDTLS_PRIVATE(read_timeout); /*!< timeout for mbedtls_ssl_read (ms) */ + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + uint32_t MBEDTLS_PRIVATE(hs_timeout_min); /*!< initial value of the handshake + retransmission timeout (ms) */ + uint32_t MBEDTLS_PRIVATE(hs_timeout_max); /*!< maximum value of the handshake + retransmission timeout (ms) */ +#endif + +#if defined(MBEDTLS_SSL_RENEGOTIATION) + int MBEDTLS_PRIVATE(renego_max_records); /*!< grace period for renegotiation */ + unsigned char MBEDTLS_PRIVATE(renego_period)[8]; /*!< value of the record counters + that triggers renegotiation */ +#endif + + unsigned int MBEDTLS_PRIVATE(badmac_limit); /*!< limit of records with a bad MAC */ + +#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C) + unsigned int MBEDTLS_PRIVATE(dhm_min_bitlen); /*!< min. bit length of the DHM prime */ +#endif + + /** User data pointer or handle. + * + * The library sets this to \p 0 when creating a context and does not + * access it afterwards. + */ + mbedtls_ssl_user_data_t MBEDTLS_PRIVATE(user_data); + +#if defined(MBEDTLS_SSL_SRV_C) + mbedtls_ssl_hs_cb_t MBEDTLS_PRIVATE(f_cert_cb); /*!< certificate selection callback */ +#endif /* MBEDTLS_SSL_SRV_C */ + +#if defined(MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED) + const mbedtls_x509_crt *MBEDTLS_PRIVATE(dn_hints);/*!< acceptable client cert issuers */ +#endif +}; + +struct mbedtls_ssl_context { + const mbedtls_ssl_config *MBEDTLS_PRIVATE(conf); /*!< configuration information */ + + /* + * Miscellaneous + */ + int MBEDTLS_PRIVATE(state); /*!< SSL handshake: current state */ +#if defined(MBEDTLS_SSL_RENEGOTIATION) + int MBEDTLS_PRIVATE(renego_status); /*!< Initial, in progress, pending? */ + int MBEDTLS_PRIVATE(renego_records_seen); /*!< Records since renego request, or with DTLS, + number of retransmissions of request if + renego_max_records is < 0 */ +#endif /* MBEDTLS_SSL_RENEGOTIATION */ + + /** + * Maximum TLS version to be negotiated, then negotiated TLS version. + * + * It is initialized as the configured maximum TLS version to be + * negotiated by mbedtls_ssl_setup(). + * + * When renegotiating or resuming a session, it is overwritten in the + * ClientHello writing preparation stage with the previously negotiated + * TLS version. + * + * On client side, it is updated to the TLS version selected by the server + * for the handshake when the ServerHello is received. + * + * On server side, it is updated to the TLS version the server selects for + * the handshake when the ClientHello is received. + */ + mbedtls_ssl_protocol_version MBEDTLS_PRIVATE(tls_version); + + unsigned MBEDTLS_PRIVATE(badmac_seen); /*!< records with a bad MAC received */ + +#if defined(MBEDTLS_X509_CRT_PARSE_C) + /** Callback to customize X.509 certificate chain verification */ + int(*MBEDTLS_PRIVATE(f_vrfy))(void *, mbedtls_x509_crt *, int, uint32_t *); + void *MBEDTLS_PRIVATE(p_vrfy); /*!< context for X.509 verify callback */ +#endif + + mbedtls_ssl_send_t *MBEDTLS_PRIVATE(f_send); /*!< Callback for network send */ + mbedtls_ssl_recv_t *MBEDTLS_PRIVATE(f_recv); /*!< Callback for network receive */ + mbedtls_ssl_recv_timeout_t *MBEDTLS_PRIVATE(f_recv_timeout); + /*!< Callback for network receive with timeout */ + + void *MBEDTLS_PRIVATE(p_bio); /*!< context for I/O operations */ + + /* + * Session layer + */ + mbedtls_ssl_session *MBEDTLS_PRIVATE(session_in); /*!< current session data (in) */ + mbedtls_ssl_session *MBEDTLS_PRIVATE(session_out); /*!< current session data (out) */ + mbedtls_ssl_session *MBEDTLS_PRIVATE(session); /*!< negotiated session data */ + mbedtls_ssl_session *MBEDTLS_PRIVATE(session_negotiate); /*!< session data in negotiation */ + + mbedtls_ssl_handshake_params *MBEDTLS_PRIVATE(handshake); /*!< params required only during + the handshake process */ + + /* + * Record layer transformations + */ + mbedtls_ssl_transform *MBEDTLS_PRIVATE(transform_in); /*!< current transform params (in) + * This is always a reference, + * never an owning pointer. */ + mbedtls_ssl_transform *MBEDTLS_PRIVATE(transform_out); /*!< current transform params (out) + * This is always a reference, + * never an owning pointer. */ + mbedtls_ssl_transform *MBEDTLS_PRIVATE(transform); /*!< negotiated transform params + * This pointer owns the transform + * it references. */ +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) + mbedtls_ssl_transform *MBEDTLS_PRIVATE(transform_negotiate); /*!< transform params in negotiation + * This pointer owns the transform + * it references. */ +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ + +#if defined(MBEDTLS_SSL_PROTO_TLS1_3) + /*! The application data transform in TLS 1.3. + * This pointer owns the transform it references. */ + mbedtls_ssl_transform *MBEDTLS_PRIVATE(transform_application); +#endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ + + /* + * Timers + */ + void *MBEDTLS_PRIVATE(p_timer); /*!< context for the timer callbacks */ + + mbedtls_ssl_set_timer_t *MBEDTLS_PRIVATE(f_set_timer); /*!< set timer callback */ + mbedtls_ssl_get_timer_t *MBEDTLS_PRIVATE(f_get_timer); /*!< get timer callback */ + + /* + * Record layer (incoming data) + */ + unsigned char *MBEDTLS_PRIVATE(in_buf); /*!< input buffer */ + unsigned char *MBEDTLS_PRIVATE(in_ctr); /*!< 64-bit incoming message counter + TLS: maintained by us + DTLS: read from peer */ + unsigned char *MBEDTLS_PRIVATE(in_hdr); /*!< start of record header */ +#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) + unsigned char *MBEDTLS_PRIVATE(in_cid); /*!< The start of the CID; + * (the end is marked by in_len). */ +#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ + unsigned char *MBEDTLS_PRIVATE(in_len); /*!< two-bytes message length field */ + unsigned char *MBEDTLS_PRIVATE(in_iv); /*!< ivlen-byte IV */ + unsigned char *MBEDTLS_PRIVATE(in_msg); /*!< message contents (in_iv+ivlen) */ + unsigned char *MBEDTLS_PRIVATE(in_offt); /*!< read offset in application data */ + + int MBEDTLS_PRIVATE(in_msgtype); /*!< record header: message type */ + size_t MBEDTLS_PRIVATE(in_msglen); /*!< record header: message length */ + size_t MBEDTLS_PRIVATE(in_left); /*!< amount of data read so far */ +#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) + size_t MBEDTLS_PRIVATE(in_buf_len); /*!< length of input buffer */ +#endif +#if defined(MBEDTLS_SSL_PROTO_DTLS) + uint16_t MBEDTLS_PRIVATE(in_epoch); /*!< DTLS epoch for incoming records */ + size_t MBEDTLS_PRIVATE(next_record_offset); /*!< offset of the next record in datagram + (equal to in_left if none) */ +#endif /* MBEDTLS_SSL_PROTO_DTLS */ +#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) + uint64_t MBEDTLS_PRIVATE(in_window_top); /*!< last validated record seq_num */ + uint64_t MBEDTLS_PRIVATE(in_window); /*!< bitmask for replay detection */ +#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ + + size_t MBEDTLS_PRIVATE(in_hslen); /*!< current handshake message length, + including the handshake header */ + int MBEDTLS_PRIVATE(nb_zero); /*!< # of 0-length encrypted messages */ + + int MBEDTLS_PRIVATE(keep_current_message); /*!< drop or reuse current message + on next call to record layer? */ + + /* The following three variables indicate if and, if yes, + * what kind of alert is pending to be sent. + */ + unsigned char MBEDTLS_PRIVATE(send_alert); /*!< Determines if a fatal alert + should be sent. Values: + - \c 0 , no alert is to be sent. + - \c 1 , alert is to be sent. */ + unsigned char MBEDTLS_PRIVATE(alert_type); /*!< Type of alert if send_alert + != 0 */ + int MBEDTLS_PRIVATE(alert_reason); /*!< The error code to be returned + to the user once the fatal alert + has been sent. */ + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + uint8_t MBEDTLS_PRIVATE(disable_datagram_packing); /*!< Disable packing multiple records + * within a single datagram. */ +#endif /* MBEDTLS_SSL_PROTO_DTLS */ + + /* + * Record layer (outgoing data) + */ + unsigned char *MBEDTLS_PRIVATE(out_buf); /*!< output buffer */ + unsigned char *MBEDTLS_PRIVATE(out_ctr); /*!< 64-bit outgoing message counter */ + unsigned char *MBEDTLS_PRIVATE(out_hdr); /*!< start of record header */ +#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) + unsigned char *MBEDTLS_PRIVATE(out_cid); /*!< The start of the CID; + * (the end is marked by in_len). */ +#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ + unsigned char *MBEDTLS_PRIVATE(out_len); /*!< two-bytes message length field */ + unsigned char *MBEDTLS_PRIVATE(out_iv); /*!< ivlen-byte IV */ + unsigned char *MBEDTLS_PRIVATE(out_msg); /*!< message contents (out_iv+ivlen) */ + + int MBEDTLS_PRIVATE(out_msgtype); /*!< record header: message type */ + size_t MBEDTLS_PRIVATE(out_msglen); /*!< record header: message length */ + size_t MBEDTLS_PRIVATE(out_left); /*!< amount of data not yet written */ +#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) + size_t MBEDTLS_PRIVATE(out_buf_len); /*!< length of output buffer */ +#endif + + unsigned char MBEDTLS_PRIVATE(cur_out_ctr)[MBEDTLS_SSL_SEQUENCE_NUMBER_LEN]; /*!< Outgoing record sequence number. */ + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + uint16_t MBEDTLS_PRIVATE(mtu); /*!< path mtu, used to fragment outgoing messages */ +#endif /* MBEDTLS_SSL_PROTO_DTLS */ + + /* + * User settings + */ +#if defined(MBEDTLS_X509_CRT_PARSE_C) + char *MBEDTLS_PRIVATE(hostname); /*!< expected peer CN for verification + (and SNI if available) */ +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +#if defined(MBEDTLS_SSL_ALPN) + const char *MBEDTLS_PRIVATE(alpn_chosen); /*!< negotiated protocol */ +#endif /* MBEDTLS_SSL_ALPN */ + +#if defined(MBEDTLS_SSL_DTLS_SRTP) + /* + * use_srtp extension + */ + mbedtls_dtls_srtp_info MBEDTLS_PRIVATE(dtls_srtp_info); +#endif /* MBEDTLS_SSL_DTLS_SRTP */ + + /* + * Information for DTLS hello verify + */ +#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) + unsigned char *MBEDTLS_PRIVATE(cli_id); /*!< transport-level ID of the client */ + size_t MBEDTLS_PRIVATE(cli_id_len); /*!< length of cli_id */ +#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */ + + /* + * Secure renegotiation + */ + /* needed to know when to send extension on server */ + int MBEDTLS_PRIVATE(secure_renegotiation); /*!< does peer support legacy or + secure renegotiation */ +#if defined(MBEDTLS_SSL_RENEGOTIATION) + size_t MBEDTLS_PRIVATE(verify_data_len); /*!< length of verify data stored */ + char MBEDTLS_PRIVATE(own_verify_data)[MBEDTLS_SSL_VERIFY_DATA_MAX_LEN]; /*!< previous handshake verify data */ + char MBEDTLS_PRIVATE(peer_verify_data)[MBEDTLS_SSL_VERIFY_DATA_MAX_LEN]; /*!< previous handshake verify data */ +#endif /* MBEDTLS_SSL_RENEGOTIATION */ + +#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) + /* CID configuration to use in subsequent handshakes. */ + + /*! The next incoming CID, chosen by the user and applying to + * all subsequent handshakes. This may be different from the + * CID currently used in case the user has re-configured the CID + * after an initial handshake. */ + unsigned char MBEDTLS_PRIVATE(own_cid)[MBEDTLS_SSL_CID_IN_LEN_MAX]; + uint8_t MBEDTLS_PRIVATE(own_cid_len); /*!< The length of \c own_cid. */ + uint8_t MBEDTLS_PRIVATE(negotiate_cid); /*!< This indicates whether the CID extension should + * be negotiated in the next handshake or not. + * Possible values are #MBEDTLS_SSL_CID_ENABLED + * and #MBEDTLS_SSL_CID_DISABLED. */ +#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ + +#if defined(MBEDTLS_SSL_EARLY_DATA) && defined(MBEDTLS_SSL_CLI_C) + int MBEDTLS_PRIVATE(early_data_status); +#endif /* MBEDTLS_SSL_EARLY_DATA && MBEDTLS_SSL_CLI_C */ + + /** Callback to export key block and master secret */ + mbedtls_ssl_export_keys_t *MBEDTLS_PRIVATE(f_export_keys); + void *MBEDTLS_PRIVATE(p_export_keys); /*!< context for key export callback */ + + /** User data pointer or handle. + * + * The library sets this to \p 0 when creating a context and does not + * access it afterwards. + * + * \warning Serializing and restoring an SSL context with + * mbedtls_ssl_context_save() and mbedtls_ssl_context_load() + * does not currently restore the user data. + */ + mbedtls_ssl_user_data_t MBEDTLS_PRIVATE(user_data); +}; + +/** + * \brief Return the name of the ciphersuite associated with the + * given ID + * + * \param ciphersuite_id SSL ciphersuite ID + * + * \return a string containing the ciphersuite name + */ +const char *mbedtls_ssl_get_ciphersuite_name(const int ciphersuite_id); + +/** + * \brief Return the ID of the ciphersuite associated with the + * given name + * + * \param ciphersuite_name SSL ciphersuite name + * + * \return the ID with the ciphersuite or 0 if not found + */ +int mbedtls_ssl_get_ciphersuite_id(const char *ciphersuite_name); + +/** + * \brief Initialize an SSL context + * Just makes the context ready for mbedtls_ssl_setup() or + * mbedtls_ssl_free() + * + * \param ssl SSL context + */ +void mbedtls_ssl_init(mbedtls_ssl_context *ssl); + +/** + * \brief Set up an SSL context for use + * + * \note No copy of the configuration context is made, it can be + * shared by many mbedtls_ssl_context structures. + * + * \warning The conf structure will be accessed during the session. + * It must not be modified or freed as long as the session + * is active. + * + * \warning This function must be called exactly once per context. + * Calling mbedtls_ssl_setup again is not supported, even + * if no session is active. + * + * \note If #MBEDTLS_USE_PSA_CRYPTO is enabled, the PSA crypto + * subsystem must have been initialized by calling + * psa_crypto_init() before calling this function. + * + * \param ssl SSL context + * \param conf SSL configuration to use + * + * \return 0 if successful, or MBEDTLS_ERR_SSL_ALLOC_FAILED if + * memory allocation failed + */ +int mbedtls_ssl_setup(mbedtls_ssl_context *ssl, + const mbedtls_ssl_config *conf); + +/** + * \brief Reset an already initialized SSL context for re-use + * while retaining application-set variables, function + * pointers and data. + * + * \param ssl SSL context + * \return 0 if successful, or MBEDTLS_ERR_SSL_ALLOC_FAILED or + MBEDTLS_ERR_SSL_HW_ACCEL_FAILED + */ +int mbedtls_ssl_session_reset(mbedtls_ssl_context *ssl); + +/** + * \brief Set the current endpoint type + * + * \param conf SSL configuration + * \param endpoint must be MBEDTLS_SSL_IS_CLIENT or MBEDTLS_SSL_IS_SERVER + */ +void mbedtls_ssl_conf_endpoint(mbedtls_ssl_config *conf, int endpoint); + +/** + * \brief Get the current endpoint type + * + * \param conf SSL configuration + * + * \return Endpoint type, either MBEDTLS_SSL_IS_CLIENT + * or MBEDTLS_SSL_IS_SERVER + */ +static inline int mbedtls_ssl_conf_get_endpoint(const mbedtls_ssl_config *conf) +{ + return conf->MBEDTLS_PRIVATE(endpoint); +} + +/** + * \brief Set the transport type (TLS or DTLS). + * Default: TLS + * + * \note For DTLS, you must either provide a recv callback that + * doesn't block, or one that handles timeouts, see + * \c mbedtls_ssl_set_bio(). You also need to provide timer + * callbacks with \c mbedtls_ssl_set_timer_cb(). + * + * \param conf SSL configuration + * \param transport transport type: + * MBEDTLS_SSL_TRANSPORT_STREAM for TLS, + * MBEDTLS_SSL_TRANSPORT_DATAGRAM for DTLS. + */ +void mbedtls_ssl_conf_transport(mbedtls_ssl_config *conf, int transport); + +/** + * \brief Set the certificate verification mode + * Default: NONE on server, REQUIRED on client + * + * \param conf SSL configuration + * \param authmode can be: + * + * MBEDTLS_SSL_VERIFY_NONE: peer certificate is not checked + * (default on server) + * (insecure on client) + * + * MBEDTLS_SSL_VERIFY_OPTIONAL: peer certificate is checked, however the + * handshake continues even if verification failed; + * mbedtls_ssl_get_verify_result() can be called after the + * handshake is complete. + * + * MBEDTLS_SSL_VERIFY_REQUIRED: peer *must* present a valid certificate, + * handshake is aborted if verification failed. + * (default on client) + * + * \note On client, MBEDTLS_SSL_VERIFY_REQUIRED is the recommended mode. + * With MBEDTLS_SSL_VERIFY_OPTIONAL, the user needs to call mbedtls_ssl_get_verify_result() at + * the right time(s), which may not be obvious, while REQUIRED always perform + * the verification as soon as possible. For example, REQUIRED was protecting + * against the "triple handshake" attack even before it was found. + */ +void mbedtls_ssl_conf_authmode(mbedtls_ssl_config *conf, int authmode); + +#if defined(MBEDTLS_SSL_PROTO_TLS1_3) && defined(MBEDTLS_SSL_EARLY_DATA) +/** + * \brief Set the early data mode + * Default: disabled on server and client + * + * \param conf The SSL configuration to use. + * \param early_data_enabled can be: + * + * MBEDTLS_SSL_EARLY_DATA_DISABLED: early data functionality is disabled + * This is the default on client and server. + * + * MBEDTLS_SSL_EARLY_DATA_ENABLED: early data functionality is enabled and + * may be negotiated in the handshake. Application using + * early data functionality needs to be aware of the + * lack of replay protection of the early data application + * payloads. + * + * \warning This interface is experimental and may change without notice. + * + */ +void mbedtls_ssl_tls13_conf_early_data(mbedtls_ssl_config *conf, + int early_data_enabled); + +#if defined(MBEDTLS_SSL_SRV_C) +/** + * \brief Set the maximum amount of 0-RTT data in bytes + * Default: #MBEDTLS_SSL_MAX_EARLY_DATA_SIZE + * + * This function sets the value of the max_early_data_size + * field of the early data indication extension included in + * the NewSessionTicket messages that the server may send. + * + * The value defines the maximum amount of 0-RTT data + * in bytes that a client will be allowed to send when using + * one of the tickets defined by the NewSessionTicket messages. + * + * \note When resuming a session using a ticket, if the server receives more + * early data than allowed for the ticket, it terminates the connection. + * The maximum amount of 0-RTT data should thus be large enough + * to allow a minimum of early data to be exchanged. + * + * \param[in] conf The SSL configuration to use. + * \param[in] max_early_data_size The maximum amount of 0-RTT data. + * + * \warning This interface is experimental and may change without notice. + * + */ +void mbedtls_ssl_tls13_conf_max_early_data_size( + mbedtls_ssl_config *conf, uint32_t max_early_data_size); +#endif /* MBEDTLS_SSL_SRV_C */ + +#endif /* MBEDTLS_SSL_PROTO_TLS1_3 && MBEDTLS_SSL_EARLY_DATA */ + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +/** + * \brief Set the verification callback (Optional). + * + * If set, the provided verify callback is called for each + * certificate in the peer's CRT chain, including the trusted + * root. For more information, please see the documentation of + * \c mbedtls_x509_crt_verify(). + * + * \note For per context callbacks and contexts, please use + * mbedtls_ssl_set_verify() instead. + * + * \param conf The SSL configuration to use. + * \param f_vrfy The verification callback to use during CRT verification. + * \param p_vrfy The opaque context to be passed to the callback. + */ +void mbedtls_ssl_conf_verify(mbedtls_ssl_config *conf, + int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), + void *p_vrfy); +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +/** + * \brief Set the random number generator callback + * + * \param conf SSL configuration + * \param f_rng RNG function (mandatory) + * \param p_rng RNG parameter + */ +void mbedtls_ssl_conf_rng(mbedtls_ssl_config *conf, + int (*f_rng)(void *, unsigned char *, size_t), + void *p_rng); + +/** + * \brief Set the debug callback + * + * The callback has the following argument: + * void * opaque context for the callback + * int debug level + * const char * file name + * int line number + * const char * message + * + * \param conf SSL configuration + * \param f_dbg debug function + * \param p_dbg debug parameter + */ +void mbedtls_ssl_conf_dbg(mbedtls_ssl_config *conf, + void (*f_dbg)(void *, int, const char *, int, const char *), + void *p_dbg); + +/** + * \brief Return the SSL configuration structure associated + * with the given SSL context. + * + * \note The pointer returned by this function is guaranteed to + * remain valid until the context is freed. + * + * \param ssl The SSL context to query. + * \return Pointer to the SSL configuration associated with \p ssl. + */ +static inline const mbedtls_ssl_config *mbedtls_ssl_context_get_config( + const mbedtls_ssl_context *ssl) +{ + return ssl->MBEDTLS_PRIVATE(conf); +} + +/** + * \brief Set the underlying BIO callbacks for write, read and + * read-with-timeout. + * + * \param ssl SSL context + * \param p_bio parameter (context) shared by BIO callbacks + * \param f_send write callback + * \param f_recv read callback + * \param f_recv_timeout blocking read callback with timeout. + * + * \note One of f_recv or f_recv_timeout can be NULL, in which case + * the other is used. If both are non-NULL, f_recv_timeout is + * used and f_recv is ignored (as if it were NULL). + * + * \note The two most common use cases are: + * - non-blocking I/O, f_recv != NULL, f_recv_timeout == NULL + * - blocking I/O, f_recv == NULL, f_recv_timeout != NULL + * + * \note For DTLS, you need to provide either a non-NULL + * f_recv_timeout callback, or a f_recv that doesn't block. + * + * \note See the documentations of \c mbedtls_ssl_send_t, + * \c mbedtls_ssl_recv_t and \c mbedtls_ssl_recv_timeout_t for + * the conventions those callbacks must follow. + * + * \note On some platforms, net_sockets.c provides + * \c mbedtls_net_send(), \c mbedtls_net_recv() and + * \c mbedtls_net_recv_timeout() that are suitable to be used + * here. + */ +void mbedtls_ssl_set_bio(mbedtls_ssl_context *ssl, + void *p_bio, + mbedtls_ssl_send_t *f_send, + mbedtls_ssl_recv_t *f_recv, + mbedtls_ssl_recv_timeout_t *f_recv_timeout); + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + +#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) + + +/** + * \brief Configure the use of the Connection ID (CID) + * extension in the next handshake. + * + * Reference: RFC 9146 (or draft-ietf-tls-dtls-connection-id-05 + * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05 + * for legacy version) + * + * The DTLS CID extension allows the reliable association of + * DTLS records to DTLS connections across changes in the + * underlying transport (changed IP and Port metadata) by + * adding explicit connection identifiers (CIDs) to the + * headers of encrypted DTLS records. The desired CIDs are + * configured by the application layer and are exchanged in + * new `ClientHello` / `ServerHello` extensions during the + * handshake, where each side indicates the CID it wants the + * peer to use when writing encrypted messages. The CIDs are + * put to use once records get encrypted: the stack discards + * any incoming records that don't include the configured CID + * in their header, and adds the peer's requested CID to the + * headers of outgoing messages. + * + * This API enables or disables the use of the CID extension + * in the next handshake and sets the value of the CID to + * be used for incoming messages. + * + * \param ssl The SSL context to configure. This must be initialized. + * \param enable This value determines whether the CID extension should + * be used or not. Possible values are: + * - MBEDTLS_SSL_CID_ENABLED to enable the use of the CID. + * - MBEDTLS_SSL_CID_DISABLED (default) to disable the use + * of the CID. + * \param own_cid The address of the readable buffer holding the CID we want + * the peer to use when sending encrypted messages to us. + * This may be \c NULL if \p own_cid_len is \c 0. + * This parameter is unused if \p enable is set to + * MBEDTLS_SSL_CID_DISABLED. + * \param own_cid_len The length of \p own_cid. + * This parameter is unused if \p enable is set to + * MBEDTLS_SSL_CID_DISABLED. + * + * \note The value of \p own_cid_len must match the value of the + * \c len parameter passed to mbedtls_ssl_conf_cid() + * when configuring the ::mbedtls_ssl_config that \p ssl + * is bound to. + * + * \note This CID configuration applies to subsequent handshakes + * performed on the SSL context \p ssl, but does not trigger + * one. You still have to call `mbedtls_ssl_handshake()` + * (for the initial handshake) or `mbedtls_ssl_renegotiate()` + * (for a renegotiation handshake) explicitly after a + * successful call to this function to run the handshake. + * + * \note This call cannot guarantee that the use of the CID + * will be successfully negotiated in the next handshake, + * because the peer might not support it. Specifically: + * - On the Client, enabling the use of the CID through + * this call implies that the `ClientHello` in the next + * handshake will include the CID extension, thereby + * offering the use of the CID to the server. Only if + * the `ServerHello` contains the CID extension, too, + * the CID extension will actually be put to use. + * - On the Server, enabling the use of the CID through + * this call implies that the server will look for + * the CID extension in a `ClientHello` from the client, + * and, if present, reply with a CID extension in its + * `ServerHello`. + * + * \note To check whether the use of the CID was negotiated + * after the subsequent handshake has completed, please + * use the API mbedtls_ssl_get_peer_cid(). + * + * \warning If the use of the CID extension is enabled in this call + * and the subsequent handshake negotiates its use, Mbed TLS + * will silently drop every packet whose CID does not match + * the CID configured in \p own_cid. It is the responsibility + * of the user to adapt the underlying transport to take care + * of CID-based demultiplexing before handing datagrams to + * Mbed TLS. + * + * \return \c 0 on success. In this case, the CID configuration + * applies to the next handshake. + * \return A negative error code on failure. + */ +int mbedtls_ssl_set_cid(mbedtls_ssl_context *ssl, + int enable, + unsigned char const *own_cid, + size_t own_cid_len); + +/** + * \brief Get information about our request for usage of the CID + * extension in the current connection. + * + * \param ssl The SSL context to query. + * \param enabled The address at which to store whether the CID extension + * is requested to be used or not. If the CID is + * requested, `*enabled` is set to + * MBEDTLS_SSL_CID_ENABLED; otherwise, it is set to + * MBEDTLS_SSL_CID_DISABLED. + * \param own_cid The address of the buffer in which to store our own + * CID (if the CID extension is requested). This may be + * \c NULL in case the value of our CID isn't needed. If + * it is not \c NULL, \p own_cid_len must not be \c NULL. + * \param own_cid_len The address at which to store the size of our own CID + * (if the CID extension is requested). This is also the + * number of Bytes in \p own_cid that have been written. + * This may be \c NULL in case the length of our own CID + * isn't needed. If it is \c NULL, \p own_cid must be + * \c NULL, too. + * + *\note If we are requesting an empty CID this function sets + * `*enabled` to #MBEDTLS_SSL_CID_DISABLED (the rationale + * for this is that the resulting outcome is the + * same as if the CID extensions wasn't requested). + * + * \return \c 0 on success. + * \return A negative error code on failure. + */ +int mbedtls_ssl_get_own_cid(mbedtls_ssl_context *ssl, + int *enabled, + unsigned char own_cid[MBEDTLS_SSL_CID_OUT_LEN_MAX], + size_t *own_cid_len); + +/** + * \brief Get information about the use of the CID extension + * in the current connection. + * + * \param ssl The SSL context to query. + * \param enabled The address at which to store whether the CID extension + * is currently in use or not. If the CID is in use, + * `*enabled` is set to MBEDTLS_SSL_CID_ENABLED; + * otherwise, it is set to MBEDTLS_SSL_CID_DISABLED. + * \param peer_cid The address of the buffer in which to store the CID + * chosen by the peer (if the CID extension is used). + * This may be \c NULL in case the value of peer CID + * isn't needed. If it is not \c NULL, \p peer_cid_len + * must not be \c NULL. + * \param peer_cid_len The address at which to store the size of the CID + * chosen by the peer (if the CID extension is used). + * This is also the number of Bytes in \p peer_cid that + * have been written. + * This may be \c NULL in case the length of the peer CID + * isn't needed. If it is \c NULL, \p peer_cid must be + * \c NULL, too. + * + * \note This applies to the state of the CID negotiated in + * the last complete handshake. If a handshake is in + * progress, this function will attempt to complete + * the handshake first. + * + * \note If CID extensions have been exchanged but both client + * and server chose to use an empty CID, this function + * sets `*enabled` to #MBEDTLS_SSL_CID_DISABLED + * (the rationale for this is that the resulting + * communication is the same as if the CID extensions + * hadn't been used). + * + * \return \c 0 on success. + * \return A negative error code on failure. + */ +int mbedtls_ssl_get_peer_cid(mbedtls_ssl_context *ssl, + int *enabled, + unsigned char peer_cid[MBEDTLS_SSL_CID_OUT_LEN_MAX], + size_t *peer_cid_len); + +#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ + +/** + * \brief Set the Maximum Transport Unit (MTU). + * Special value: 0 means unset (no limit). + * This represents the maximum size of a datagram payload + * handled by the transport layer (usually UDP) as determined + * by the network link and stack. In practice, this controls + * the maximum size datagram the DTLS layer will pass to the + * \c f_send() callback set using \c mbedtls_ssl_set_bio(). + * + * \note The limit on datagram size is converted to a limit on + * record payload by subtracting the current overhead of + * encapsulation and encryption/authentication if any. + * + * \note This can be called at any point during the connection, for + * example when a Path Maximum Transfer Unit (PMTU) + * estimate becomes available from other sources, + * such as lower (or higher) protocol layers. + * + * \note This setting only controls the size of the packets we send, + * and does not restrict the size of the datagrams we're + * willing to receive. Client-side, you can request the + * server to use smaller records with \c + * mbedtls_ssl_conf_max_frag_len(). + * + * \note If both a MTU and a maximum fragment length have been + * configured (or negotiated with the peer), the resulting + * lower limit on record payload (see first note) is used. + * + * \note This can only be used to decrease the maximum size + * of datagrams (hence records, see first note) sent. It + * cannot be used to increase the maximum size of records over + * the limit set by #MBEDTLS_SSL_OUT_CONTENT_LEN. + * + * \note Values lower than the current record layer expansion will + * result in an error when trying to send data. + * + * \param ssl SSL context + * \param mtu Value of the path MTU in bytes + */ +void mbedtls_ssl_set_mtu(mbedtls_ssl_context *ssl, uint16_t mtu); +#endif /* MBEDTLS_SSL_PROTO_DTLS */ + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +/** + * \brief Set a connection-specific verification callback (optional). + * + * If set, the provided verify callback is called for each + * certificate in the peer's CRT chain, including the trusted + * root. For more information, please see the documentation of + * \c mbedtls_x509_crt_verify(). + * + * \note This call is analogous to mbedtls_ssl_conf_verify() but + * binds the verification callback and context to an SSL context + * as opposed to an SSL configuration. + * If mbedtls_ssl_conf_verify() and mbedtls_ssl_set_verify() + * are both used, mbedtls_ssl_set_verify() takes precedence. + * + * \param ssl The SSL context to use. + * \param f_vrfy The verification callback to use during CRT verification. + * \param p_vrfy The opaque context to be passed to the callback. + */ +void mbedtls_ssl_set_verify(mbedtls_ssl_context *ssl, + int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), + void *p_vrfy); +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +/** + * \brief Set the timeout period for mbedtls_ssl_read() + * (Default: no timeout.) + * + * \param conf SSL configuration context + * \param timeout Timeout value in milliseconds. + * Use 0 for no timeout (default). + * + * \note With blocking I/O, this will only work if a non-NULL + * \c f_recv_timeout was set with \c mbedtls_ssl_set_bio(). + * With non-blocking I/O, this will only work if timer + * callbacks were set with \c mbedtls_ssl_set_timer_cb(). + * + * \note With non-blocking I/O, you may also skip this function + * altogether and handle timeouts at the application layer. + */ +void mbedtls_ssl_conf_read_timeout(mbedtls_ssl_config *conf, uint32_t timeout); + +/** + * \brief Check whether a buffer contains a valid and authentic record + * that has not been seen before. (DTLS only). + * + * This function does not change the user-visible state + * of the SSL context. Its sole purpose is to provide + * an indication of the legitimacy of an incoming record. + * + * This can be useful e.g. in distributed server environments + * using the DTLS Connection ID feature, in which connections + * might need to be passed between service instances on a change + * of peer address, but where such disruptive operations should + * only happen after the validity of incoming records has been + * confirmed. + * + * \param ssl The SSL context to use. + * \param buf The address of the buffer holding the record to be checked. + * This must be a read/write buffer of length \p buflen Bytes. + * \param buflen The length of \p buf in Bytes. + * + * \note This routine only checks whether the provided buffer begins + * with a valid and authentic record that has not been seen + * before, but does not check potential data following the + * initial record. In particular, it is possible to pass DTLS + * datagrams containing multiple records, in which case only + * the first record is checked. + * + * \note This function modifies the input buffer \p buf. If you need + * to preserve the original record, you have to maintain a copy. + * + * \return \c 0 if the record is valid and authentic and has not been + * seen before. + * \return MBEDTLS_ERR_SSL_INVALID_MAC if the check completed + * successfully but the record was found to be not authentic. + * \return MBEDTLS_ERR_SSL_INVALID_RECORD if the check completed + * successfully but the record was found to be invalid for + * a reason different from authenticity checking. + * \return MBEDTLS_ERR_SSL_UNEXPECTED_RECORD if the check completed + * successfully but the record was found to be unexpected + * in the state of the SSL context, including replayed records. + * \return Another negative error code on different kinds of failure. + * In this case, the SSL context becomes unusable and needs + * to be freed or reset before reuse. + */ +int mbedtls_ssl_check_record(mbedtls_ssl_context const *ssl, + unsigned char *buf, + size_t buflen); + +/** + * \brief Set the timer callbacks (Mandatory for DTLS.) + * + * \param ssl SSL context + * \param p_timer parameter (context) shared by timer callbacks + * \param f_set_timer set timer callback + * \param f_get_timer get timer callback. Must return: + * + * \note See the documentation of \c mbedtls_ssl_set_timer_t and + * \c mbedtls_ssl_get_timer_t for the conventions this pair of + * callbacks must follow. + * + * \note On some platforms, timing.c provides + * \c mbedtls_timing_set_delay() and + * \c mbedtls_timing_get_delay() that are suitable for using + * here, except if using an event-driven style. + * + * \note See also the "DTLS tutorial" article in our knowledge base. + * https://mbed-tls.readthedocs.io/en/latest/kb/how-to/dtls-tutorial + */ +void mbedtls_ssl_set_timer_cb(mbedtls_ssl_context *ssl, + void *p_timer, + mbedtls_ssl_set_timer_t *f_set_timer, + mbedtls_ssl_get_timer_t *f_get_timer); + +#if defined(MBEDTLS_SSL_SRV_C) +/** + * \brief Set the certificate selection callback (server-side only). + * + * If set, the callback is always called for each handshake, + * after `ClientHello` processing has finished. + * + * \param conf The SSL configuration to register the callback with. + * \param f_cert_cb The callback for selecting server certificate after + * `ClientHello` processing has finished. + */ +static inline void mbedtls_ssl_conf_cert_cb(mbedtls_ssl_config *conf, + mbedtls_ssl_hs_cb_t f_cert_cb) +{ + conf->MBEDTLS_PRIVATE(f_cert_cb) = f_cert_cb; +} +#endif /* MBEDTLS_SSL_SRV_C */ + +/** + * \brief Callback type: generate and write session ticket + * + * \note This describes what a callback implementation should do. + * This callback should generate an encrypted and + * authenticated ticket for the session and write it to the + * output buffer. Here, ticket means the opaque ticket part + * of the NewSessionTicket structure of RFC 5077. + * + * \param p_ticket Context for the callback + * \param session SSL session to be written in the ticket + * \param start Start of the output buffer + * \param end End of the output buffer + * \param tlen On exit, holds the length written + * \param lifetime On exit, holds the lifetime of the ticket in seconds + * + * \return 0 if successful, or + * a specific MBEDTLS_ERR_XXX code. + */ +typedef int mbedtls_ssl_ticket_write_t(void *p_ticket, + const mbedtls_ssl_session *session, + unsigned char *start, + const unsigned char *end, + size_t *tlen, + uint32_t *lifetime); + +/** + * \brief Callback type: parse and load session ticket + * + * \note This describes what a callback implementation should do. + * This callback should parse a session ticket as generated + * by the corresponding mbedtls_ssl_ticket_write_t function, + * and, if the ticket is authentic and valid, load the + * session. + * + * \note The implementation is allowed to modify the first len + * bytes of the input buffer, eg to use it as a temporary + * area for the decrypted ticket contents. + * + * \param p_ticket Context for the callback + * \param session SSL session to be loaded + * \param buf Start of the buffer containing the ticket + * \param len Length of the ticket. + * + * \return 0 if successful, or + * MBEDTLS_ERR_SSL_INVALID_MAC if not authentic, or + * MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED if expired, or + * any other non-zero code for other failures. + */ +typedef int mbedtls_ssl_ticket_parse_t(void *p_ticket, + mbedtls_ssl_session *session, + unsigned char *buf, + size_t len); + +#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_SRV_C) +/** + * \brief Configure SSL session ticket callbacks (server only). + * (Default: none.) + * + * \note On server, session tickets are enabled by providing + * non-NULL callbacks. + * + * \note On client, use \c mbedtls_ssl_conf_session_tickets(). + * + * \param conf SSL configuration context + * \param f_ticket_write Callback for writing a ticket + * \param f_ticket_parse Callback for parsing a ticket + * \param p_ticket Context shared by the two callbacks + */ +void mbedtls_ssl_conf_session_tickets_cb(mbedtls_ssl_config *conf, + mbedtls_ssl_ticket_write_t *f_ticket_write, + mbedtls_ssl_ticket_parse_t *f_ticket_parse, + void *p_ticket); +#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_SRV_C */ + +/** + * \brief Configure a key export callback. + * (Default: none.) + * + * This API can be used for two purposes: + * - Debugging: Use this API to e.g. generate an NSSKeylog + * file and use it to inspect encrypted traffic in tools + * such as Wireshark. + * - Application-specific export: Use this API to implement + * key exporters, e.g. for EAP-TLS or DTLS-SRTP. + * + * + * \param ssl The SSL context to which the export + * callback should be attached. + * \param f_export_keys The callback for the key export. + * \param p_export_keys The opaque context pointer to be passed to the + * callback \p f_export_keys. + */ +void mbedtls_ssl_set_export_keys_cb(mbedtls_ssl_context *ssl, + mbedtls_ssl_export_keys_t *f_export_keys, + void *p_export_keys); + +/** \brief Set the user data in an SSL configuration to a pointer. + * + * You can retrieve this value later with mbedtls_ssl_conf_get_user_data_p(). + * + * \note The library stores \c p without accessing it. It is the responsibility + * of the caller to ensure that the pointer remains valid. + * + * \param conf The SSL configuration context to modify. + * \param p The new value of the user data. + */ +static inline void mbedtls_ssl_conf_set_user_data_p( + mbedtls_ssl_config *conf, + void *p) +{ + conf->MBEDTLS_PRIVATE(user_data).p = p; +} + +/** \brief Set the user data in an SSL configuration to an integer. + * + * You can retrieve this value later with mbedtls_ssl_conf_get_user_data_n(). + * + * \param conf The SSL configuration context to modify. + * \param n The new value of the user data. + */ +static inline void mbedtls_ssl_conf_set_user_data_n( + mbedtls_ssl_config *conf, + uintptr_t n) +{ + conf->MBEDTLS_PRIVATE(user_data).n = n; +} + +/** \brief Retrieve the user data in an SSL configuration as a pointer. + * + * This is the value last set with mbedtls_ssl_conf_set_user_data_p(), or + * \c NULL if mbedtls_ssl_conf_set_user_data_p() has not previously been + * called. The value is undefined if mbedtls_ssl_conf_set_user_data_n() has + * been called without a subsequent call to mbedtls_ssl_conf_set_user_data_p(). + * + * \param conf The SSL configuration context to modify. + * \return The current value of the user data. + */ +static inline void *mbedtls_ssl_conf_get_user_data_p( + mbedtls_ssl_config *conf) +{ + return conf->MBEDTLS_PRIVATE(user_data).p; +} + +/** \brief Retrieve the user data in an SSL configuration as an integer. + * + * This is the value last set with mbedtls_ssl_conf_set_user_data_n(), or + * \c 0 if mbedtls_ssl_conf_set_user_data_n() has not previously been + * called. The value is undefined if mbedtls_ssl_conf_set_user_data_p() has + * been called without a subsequent call to mbedtls_ssl_conf_set_user_data_n(). + * + * \param conf The SSL configuration context to modify. + * \return The current value of the user data. + */ +static inline uintptr_t mbedtls_ssl_conf_get_user_data_n( + mbedtls_ssl_config *conf) +{ + return conf->MBEDTLS_PRIVATE(user_data).n; +} + +/** \brief Set the user data in an SSL context to a pointer. + * + * You can retrieve this value later with mbedtls_ssl_get_user_data_p(). + * + * \note The library stores \c p without accessing it. It is the responsibility + * of the caller to ensure that the pointer remains valid. + * + * \param ssl The SSL context to modify. + * \param p The new value of the user data. + */ +static inline void mbedtls_ssl_set_user_data_p( + mbedtls_ssl_context *ssl, + void *p) +{ + ssl->MBEDTLS_PRIVATE(user_data).p = p; +} + +/** \brief Set the user data in an SSL context to an integer. + * + * You can retrieve this value later with mbedtls_ssl_get_user_data_n(). + * + * \param ssl The SSL context to modify. + * \param n The new value of the user data. + */ +static inline void mbedtls_ssl_set_user_data_n( + mbedtls_ssl_context *ssl, + uintptr_t n) +{ + ssl->MBEDTLS_PRIVATE(user_data).n = n; +} + +/** \brief Retrieve the user data in an SSL context as a pointer. + * + * This is the value last set with mbedtls_ssl_set_user_data_p(), or + * \c NULL if mbedtls_ssl_set_user_data_p() has not previously been + * called. The value is undefined if mbedtls_ssl_set_user_data_n() has + * been called without a subsequent call to mbedtls_ssl_set_user_data_p(). + * + * \param ssl The SSL context to modify. + * \return The current value of the user data. + */ +static inline void *mbedtls_ssl_get_user_data_p( + mbedtls_ssl_context *ssl) +{ + return ssl->MBEDTLS_PRIVATE(user_data).p; +} + +/** \brief Retrieve the user data in an SSL context as an integer. + * + * This is the value last set with mbedtls_ssl_set_user_data_n(), or + * \c 0 if mbedtls_ssl_set_user_data_n() has not previously been + * called. The value is undefined if mbedtls_ssl_set_user_data_p() has + * been called without a subsequent call to mbedtls_ssl_set_user_data_n(). + * + * \param ssl The SSL context to modify. + * \return The current value of the user data. + */ +static inline uintptr_t mbedtls_ssl_get_user_data_n( + mbedtls_ssl_context *ssl) +{ + return ssl->MBEDTLS_PRIVATE(user_data).n; +} + +#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) +/** + * \brief Configure asynchronous private key operation callbacks. + * + * \param conf SSL configuration context + * \param f_async_sign Callback to start a signature operation. See + * the description of ::mbedtls_ssl_async_sign_t + * for more information. This may be \c NULL if the + * external processor does not support any signature + * operation; in this case the private key object + * associated with the certificate will be used. + * \param f_async_decrypt Callback to start a decryption operation. See + * the description of ::mbedtls_ssl_async_decrypt_t + * for more information. This may be \c NULL if the + * external processor does not support any decryption + * operation; in this case the private key object + * associated with the certificate will be used. + * \param f_async_resume Callback to resume an asynchronous operation. See + * the description of ::mbedtls_ssl_async_resume_t + * for more information. This may not be \c NULL unless + * \p f_async_sign and \p f_async_decrypt are both + * \c NULL. + * \param f_async_cancel Callback to cancel an asynchronous operation. See + * the description of ::mbedtls_ssl_async_cancel_t + * for more information. This may be \c NULL if + * no cleanup is needed. + * \param config_data A pointer to configuration data which can be + * retrieved with + * mbedtls_ssl_conf_get_async_config_data(). The + * library stores this value without dereferencing it. + */ +void mbedtls_ssl_conf_async_private_cb(mbedtls_ssl_config *conf, + mbedtls_ssl_async_sign_t *f_async_sign, + mbedtls_ssl_async_decrypt_t *f_async_decrypt, + mbedtls_ssl_async_resume_t *f_async_resume, + mbedtls_ssl_async_cancel_t *f_async_cancel, + void *config_data); + +/** + * \brief Retrieve the configuration data set by + * mbedtls_ssl_conf_async_private_cb(). + * + * \param conf SSL configuration context + * \return The configuration data set by + * mbedtls_ssl_conf_async_private_cb(). + */ +void *mbedtls_ssl_conf_get_async_config_data(const mbedtls_ssl_config *conf); + +/** + * \brief Retrieve the asynchronous operation user context. + * + * \note This function may only be called while a handshake + * is in progress. + * + * \param ssl The SSL context to access. + * + * \return The asynchronous operation user context that was last + * set during the current handshake. If + * mbedtls_ssl_set_async_operation_data() has not yet been + * called during the current handshake, this function returns + * \c NULL. + */ +void *mbedtls_ssl_get_async_operation_data(const mbedtls_ssl_context *ssl); + +/** + * \brief Retrieve the asynchronous operation user context. + * + * \note This function may only be called while a handshake + * is in progress. + * + * \param ssl The SSL context to access. + * \param ctx The new value of the asynchronous operation user context. + * Call mbedtls_ssl_get_async_operation_data() later during the + * same handshake to retrieve this value. + */ +void mbedtls_ssl_set_async_operation_data(mbedtls_ssl_context *ssl, + void *ctx); +#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ + +/** + * \brief Callback type: generate a cookie + * + * \param ctx Context for the callback + * \param p Buffer to write to, + * must be updated to point right after the cookie + * \param end Pointer to one past the end of the output buffer + * \param info Client ID info that was passed to + * \c mbedtls_ssl_set_client_transport_id() + * \param ilen Length of info in bytes + * + * \return The callback must return 0 on success, + * or a negative error code. + */ +typedef int mbedtls_ssl_cookie_write_t(void *ctx, + unsigned char **p, unsigned char *end, + const unsigned char *info, size_t ilen); + +/** + * \brief Callback type: verify a cookie + * + * \param ctx Context for the callback + * \param cookie Cookie to verify + * \param clen Length of cookie + * \param info Client ID info that was passed to + * \c mbedtls_ssl_set_client_transport_id() + * \param ilen Length of info in bytes + * + * \return The callback must return 0 if cookie is valid, + * or a negative error code. + */ +typedef int mbedtls_ssl_cookie_check_t(void *ctx, + const unsigned char *cookie, size_t clen, + const unsigned char *info, size_t ilen); + +#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) +/** + * \brief Register callbacks for DTLS cookies + * (Server only. DTLS only.) + * + * Default: dummy callbacks that fail, in order to force you to + * register working callbacks (and initialize their context). + * + * To disable HelloVerifyRequest, register NULL callbacks. + * + * \warning Disabling hello verification allows your server to be used + * for amplification in DoS attacks against other hosts. + * Only disable if you known this can't happen in your + * particular environment. + * + * \note See comments on \c mbedtls_ssl_handshake() about handling + * the MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED that is expected + * on the first handshake attempt when this is enabled. + * + * \note This is also necessary to handle client reconnection from + * the same port as described in RFC 6347 section 4.2.8 (only + * the variant with cookies is supported currently). See + * comments on \c mbedtls_ssl_read() for details. + * + * \param conf SSL configuration + * \param f_cookie_write Cookie write callback + * \param f_cookie_check Cookie check callback + * \param p_cookie Context for both callbacks + */ +void mbedtls_ssl_conf_dtls_cookies(mbedtls_ssl_config *conf, + mbedtls_ssl_cookie_write_t *f_cookie_write, + mbedtls_ssl_cookie_check_t *f_cookie_check, + void *p_cookie); + +/** + * \brief Set client's transport-level identification info. + * (Server only. DTLS only.) + * + * This is usually the IP address (and port), but could be + * anything identify the client depending on the underlying + * network stack. Used for HelloVerifyRequest with DTLS. + * This is *not* used to route the actual packets. + * + * \param ssl SSL context + * \param info Transport-level info identifying the client (eg IP + port) + * \param ilen Length of info in bytes + * + * \note An internal copy is made, so the info buffer can be reused. + * + * \return 0 on success, + * MBEDTLS_ERR_SSL_BAD_INPUT_DATA if used on client, + * MBEDTLS_ERR_SSL_ALLOC_FAILED if out of memory. + */ +int mbedtls_ssl_set_client_transport_id(mbedtls_ssl_context *ssl, + const unsigned char *info, + size_t ilen); + +#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */ + +#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) +/** + * \brief Enable or disable anti-replay protection for DTLS. + * (DTLS only, no effect on TLS.) + * Default: enabled. + * + * \param conf SSL configuration + * \param mode MBEDTLS_SSL_ANTI_REPLAY_ENABLED or MBEDTLS_SSL_ANTI_REPLAY_DISABLED. + * + * \warning Disabling this is a security risk unless the application + * protocol handles duplicated packets in a safe way. You + * should not disable this without careful consideration. + * However, if your application already detects duplicated + * packets and needs information about them to adjust its + * transmission strategy, then you'll want to disable this. + */ +void mbedtls_ssl_conf_dtls_anti_replay(mbedtls_ssl_config *conf, char mode); +#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ + +/** + * \brief Set a limit on the number of records with a bad MAC + * before terminating the connection. + * (DTLS only, no effect on TLS.) + * Default: 0 (disabled). + * + * \param conf SSL configuration + * \param limit Limit, or 0 to disable. + * + * \note If the limit is N, then the connection is terminated when + * the Nth non-authentic record is seen. + * + * \note Records with an invalid header are not counted, only the + * ones going through the authentication-decryption phase. + * + * \note This is a security trade-off related to the fact that it's + * often relatively easy for an active attacker to inject UDP + * datagrams. On one hand, setting a low limit here makes it + * easier for such an attacker to forcibly terminated a + * connection. On the other hand, a high limit or no limit + * might make us waste resources checking authentication on + * many bogus packets. + */ +void mbedtls_ssl_conf_dtls_badmac_limit(mbedtls_ssl_config *conf, unsigned limit); + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + +/** + * \brief Allow or disallow packing of multiple handshake records + * within a single datagram. + * + * \param ssl The SSL context to configure. + * \param allow_packing This determines whether datagram packing may + * be used or not. A value of \c 0 means that every + * record will be sent in a separate datagram; a + * value of \c 1 means that, if space permits, + * multiple handshake messages (including CCS) belonging to + * a single flight may be packed within a single datagram. + * + * \note This is enabled by default and should only be disabled + * for test purposes, or if datagram packing causes + * interoperability issues with peers that don't support it. + * + * \note Allowing datagram packing reduces the network load since + * there's less overhead if multiple messages share the same + * datagram. Also, it increases the handshake efficiency + * since messages belonging to a single datagram will not + * be reordered in transit, and so future message buffering + * or flight retransmission (if no buffering is used) as + * means to deal with reordering are needed less frequently. + * + * \note Application records are not affected by this option and + * are currently always sent in separate datagrams. + * + */ +void mbedtls_ssl_set_datagram_packing(mbedtls_ssl_context *ssl, + unsigned allow_packing); + +/** + * \brief Set retransmit timeout values for the DTLS handshake. + * (DTLS only, no effect on TLS.) + * + * \param conf SSL configuration + * \param min Initial timeout value in milliseconds. + * Default: 1000 (1 second). + * \param max Maximum timeout value in milliseconds. + * Default: 60000 (60 seconds). + * + * \note Default values are from RFC 6347 section 4.2.4.1. + * + * \note The 'min' value should typically be slightly above the + * expected round-trip time to your peer, plus whatever time + * it takes for the peer to process the message. For example, + * if your RTT is about 600ms and you peer needs up to 1s to + * do the cryptographic operations in the handshake, then you + * should set 'min' slightly above 1600. Lower values of 'min' + * might cause spurious resends which waste network resources, + * while larger value of 'min' will increase overall latency + * on unreliable network links. + * + * \note The more unreliable your network connection is, the larger + * your max / min ratio needs to be in order to achieve + * reliable handshakes. + * + * \note Messages are retransmitted up to log2(ceil(max/min)) times. + * For example, if min = 1s and max = 5s, the retransmit plan + * goes: send ... 1s -> resend ... 2s -> resend ... 4s -> + * resend ... 5s -> give up and return a timeout error. + */ +void mbedtls_ssl_conf_handshake_timeout(mbedtls_ssl_config *conf, uint32_t min, uint32_t max); +#endif /* MBEDTLS_SSL_PROTO_DTLS */ + +#if defined(MBEDTLS_SSL_SRV_C) +/** + * \brief Set the session cache callbacks (server-side only) + * If not set, no session resuming is done (except if session + * tickets are enabled too). + * + * The session cache has the responsibility to check for stale + * entries based on timeout. See RFC 5246 for recommendations. + * + * Warning: session.peer_cert is cleared by the SSL/TLS layer on + * connection shutdown, so do not cache the pointer! Either set + * it to NULL or make a full copy of the certificate. + * + * The get callback is called once during the initial handshake + * to enable session resuming. The get function has the + * following parameters: (void *parameter, mbedtls_ssl_session *session) + * If a valid entry is found, it should fill the master of + * the session object with the cached values and return 0, + * return 1 otherwise. Optionally peer_cert can be set as well + * if it is properly present in cache entry. + * + * The set callback is called once during the initial handshake + * to enable session resuming after the entire handshake has + * been finished. The set function has the following parameters: + * (void *parameter, const mbedtls_ssl_session *session). The function + * should create a cache entry for future retrieval based on + * the data in the session structure and should keep in mind + * that the mbedtls_ssl_session object presented (and all its referenced + * data) is cleared by the SSL/TLS layer when the connection is + * terminated. It is recommended to add metadata to determine if + * an entry is still valid in the future. Return 0 if + * successfully cached, return 1 otherwise. + * + * \param conf SSL configuration + * \param p_cache parameter (context) for both callbacks + * \param f_get_cache session get callback + * \param f_set_cache session set callback + */ +void mbedtls_ssl_conf_session_cache(mbedtls_ssl_config *conf, + void *p_cache, + mbedtls_ssl_cache_get_t *f_get_cache, + mbedtls_ssl_cache_set_t *f_set_cache); +#endif /* MBEDTLS_SSL_SRV_C */ + +#if defined(MBEDTLS_SSL_CLI_C) +/** + * \brief Load a session for session resumption. + * + * Sessions loaded through this call will be considered + * for session resumption in the next handshake. + * + * \note Even if this call succeeds, it is not guaranteed that + * the next handshake will indeed be shortened through the + * use of session resumption: The server is always free + * to reject any attempt for resumption and fall back to + * a full handshake. + * + * \note This function can handle a variety of mechanisms for session + * resumption: For TLS 1.2, both session ID-based resumption and + * ticket-based resumption will be considered. For TLS 1.3, + * once implemented, sessions equate to tickets, and loading + * one or more sessions via this call will lead to their + * corresponding tickets being advertised as resumption PSKs + * by the client. + * + * \note Calling this function multiple times will only be useful + * once TLS 1.3 is supported. For TLS 1.2 connections, this + * function should be called at most once. + * + * \param ssl The SSL context representing the connection which should + * be attempted to be setup using session resumption. This + * must be initialized via mbedtls_ssl_init() and bound to + * an SSL configuration via mbedtls_ssl_setup(), but + * the handshake must not yet have been started. + * \param session The session to be considered for session resumption. + * This must be a session previously exported via + * mbedtls_ssl_get_session(), and potentially serialized and + * deserialized through mbedtls_ssl_session_save() and + * mbedtls_ssl_session_load() in the meantime. + * + * \return \c 0 if successful. + * \return \c MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE if the session + * could not be loaded because of an implementation limitation. + * This error is non-fatal, and has no observable effect on + * the SSL context or the session that was attempted to be loaded. + * \return Another negative error code on other kinds of failure. + * + * \sa mbedtls_ssl_get_session() + * \sa mbedtls_ssl_session_load() + */ +int mbedtls_ssl_set_session(mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session); +#endif /* MBEDTLS_SSL_CLI_C */ + +/** + * \brief Load serialized session data into a session structure. + * On client, this can be used for loading saved sessions + * before resuming them with mbedtls_ssl_set_session(). + * On server, this can be used for alternative implementations + * of session cache or session tickets. + * + * \warning If a peer certificate chain is associated with the session, + * the serialized state will only contain the peer's + * end-entity certificate and the result of the chain + * verification (unless verification was disabled), but not + * the rest of the chain. + * + * \see mbedtls_ssl_session_save() + * \see mbedtls_ssl_set_session() + * + * \param session The session structure to be populated. It must have been + * initialised with mbedtls_ssl_session_init() but not + * populated yet. + * \param buf The buffer holding the serialized session data. It must be a + * readable buffer of at least \p len bytes. + * \param len The size of the serialized data in bytes. + * + * \return \c 0 if successful. + * \return #MBEDTLS_ERR_SSL_ALLOC_FAILED if memory allocation failed. + * \return #MBEDTLS_ERR_SSL_BAD_INPUT_DATA if input data is invalid. + * \return #MBEDTLS_ERR_SSL_VERSION_MISMATCH if the serialized data + * was generated in a different version or configuration of + * Mbed TLS. + * \return Another negative value for other kinds of errors (for + * example, unsupported features in the embedded certificate). + */ +int mbedtls_ssl_session_load(mbedtls_ssl_session *session, + const unsigned char *buf, + size_t len); + +/** + * \brief Save session structure as serialized data in a buffer. + * On client, this can be used for saving session data, + * potentially in non-volatile storage, for resuming later. + * On server, this can be used for alternative implementations + * of session cache or session tickets. + * + * \see mbedtls_ssl_session_load() + * + * \param session The session structure to be saved. + * \param buf The buffer to write the serialized data to. It must be a + * writeable buffer of at least \p buf_len bytes, or may be \c + * NULL if \p buf_len is \c 0. + * \param buf_len The number of bytes available for writing in \p buf. + * \param olen The size in bytes of the data that has been or would have + * been written. It must point to a valid \c size_t. + * + * \note \p olen is updated to the correct value regardless of + * whether \p buf_len was large enough. This makes it possible + * to determine the necessary size by calling this function + * with \p buf set to \c NULL and \p buf_len to \c 0. + * + * \return \c 0 if successful. + * \return #MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL if \p buf is too small. + */ +int mbedtls_ssl_session_save(const mbedtls_ssl_session *session, + unsigned char *buf, + size_t buf_len, + size_t *olen); + +/** + * \brief Set the list of allowed ciphersuites and the preference + * order. First in the list has the highest preference. + * + * For TLS 1.2, the notion of ciphersuite determines both + * the key exchange mechanism and the suite of symmetric + * algorithms to be used during and after the handshake. + * + * For TLS 1.3 (in development), the notion of ciphersuite + * only determines the suite of symmetric algorithms to be + * used during and after the handshake, while key exchange + * mechanisms are configured separately. + * + * In Mbed TLS, ciphersuites for both TLS 1.2 and TLS 1.3 + * are configured via this function. For users of TLS 1.3, + * there will be separate API for the configuration of key + * exchange mechanisms. + * + * The list of ciphersuites passed to this function may + * contain a mixture of TLS 1.2 and TLS 1.3 ciphersuite + * identifiers. This is useful if negotiation of TLS 1.3 + * should be attempted, but a fallback to TLS 1.2 would + * be tolerated. + * + * \note By default, the server chooses its preferred + * ciphersuite among those that the client supports. If + * mbedtls_ssl_conf_preference_order() is called to prefer + * the client's preferences, the server instead chooses + * the client's preferred ciphersuite among those that + * the server supports. + * + * \warning The ciphersuites array \p ciphersuites is not copied. + * It must remain valid for the lifetime of the SSL + * configuration \p conf. + * + * \param conf The SSL configuration to modify. + * \param ciphersuites A 0-terminated list of IANA identifiers of supported + * ciphersuites, accessible through \c MBEDTLS_TLS_XXX + * and \c MBEDTLS_TLS1_3_XXX macros defined in + * ssl_ciphersuites.h. + */ +void mbedtls_ssl_conf_ciphersuites(mbedtls_ssl_config *conf, + const int *ciphersuites); + +#if defined(MBEDTLS_SSL_PROTO_TLS1_3) +/** + * \brief Set the supported key exchange modes for TLS 1.3 connections. + * + * In contrast to TLS 1.2, the ciphersuite concept in TLS 1.3 does not + * include the choice of key exchange mechanism. It is therefore not + * covered by the API mbedtls_ssl_conf_ciphersuites(). See the + * documentation of mbedtls_ssl_conf_ciphersuites() for more + * information on the ciphersuite concept in TLS 1.2 and TLS 1.3. + * + * The present function is specific to TLS 1.3 and allows users to + * configure the set of supported key exchange mechanisms in TLS 1.3. + * + * \param conf The SSL configuration the change should apply to. + * \param kex_modes A bitwise combination of one or more of the following: + * - MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK + * This flag enables pure-PSK key exchanges. + * - MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL + * This flag enables combined PSK-ephemeral key exchanges. + * - MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL + * This flag enables pure-ephemeral key exchanges. + * For convenience, the following pre-defined macros are + * available for combinations of the above: + * - MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_ALL + * Includes all of pure-PSK, PSK-ephemeral and pure-ephemeral. + * - MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_ALL + * Includes both pure-PSK and combined PSK-ephemeral + * key exchanges, but excludes pure-ephemeral key exchanges. + * - MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ALL + * Includes both pure-ephemeral and combined PSK-ephemeral + * key exchanges. + * + * \note If a PSK-based key exchange mode shall be supported, applications + * must also use the APIs mbedtls_ssl_conf_psk() or + * mbedtls_ssl_conf_psk_cb() or mbedtls_ssl_conf_psk_opaque() + * to configure the PSKs to be used. + * + * \note If a pure-ephemeral key exchange mode shall be supported, + * server-side applications must also provide a certificate via + * mbedtls_ssl_conf_own_cert(). + * + */ + +void mbedtls_ssl_conf_tls13_key_exchange_modes(mbedtls_ssl_config *conf, + const int kex_modes); +#endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ + +#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) +#define MBEDTLS_SSL_UNEXPECTED_CID_IGNORE 0 +#define MBEDTLS_SSL_UNEXPECTED_CID_FAIL 1 +/** + * \brief Specify the length of Connection IDs for incoming + * encrypted DTLS records, as well as the behaviour + * on unexpected CIDs. + * + * By default, the CID length is set to \c 0, + * and unexpected CIDs are silently ignored. + * + * \param conf The SSL configuration to modify. + * \param len The length in Bytes of the CID fields in encrypted + * DTLS records using the CID mechanism. This must + * not be larger than #MBEDTLS_SSL_CID_OUT_LEN_MAX. + * \param ignore_other_cids This determines the stack's behaviour when + * receiving a record with an unexpected CID. + * Possible values are: + * - #MBEDTLS_SSL_UNEXPECTED_CID_IGNORE + * In this case, the record is silently ignored. + * - #MBEDTLS_SSL_UNEXPECTED_CID_FAIL + * In this case, the stack fails with the specific + * error code #MBEDTLS_ERR_SSL_UNEXPECTED_CID. + * + * \note The CID specification allows implementations to either + * use a common length for all incoming connection IDs or + * allow variable-length incoming IDs. Mbed TLS currently + * requires a common length for all connections sharing the + * same SSL configuration; this allows simpler parsing of + * record headers. + * + * \return \c 0 on success. + * \return #MBEDTLS_ERR_SSL_BAD_INPUT_DATA if \p len + * is too large. + */ +int mbedtls_ssl_conf_cid(mbedtls_ssl_config *conf, size_t len, + int ignore_other_cids); +#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +/** + * \brief Set the X.509 security profile used for verification + * + * \note The restrictions are enforced for all certificates in the + * chain. However, signatures in the handshake are not covered + * by this setting but by \b mbedtls_ssl_conf_sig_hashes(). + * + * \param conf SSL configuration + * \param profile Profile to use + */ +void mbedtls_ssl_conf_cert_profile(mbedtls_ssl_config *conf, + const mbedtls_x509_crt_profile *profile); + +/** + * \brief Set the data required to verify peer certificate + * + * \note See \c mbedtls_x509_crt_verify() for notes regarding the + * parameters ca_chain (maps to trust_ca for that function) + * and ca_crl. + * + * \param conf SSL configuration + * \param ca_chain trusted CA chain (meaning all fully trusted top-level CAs) + * \param ca_crl trusted CA CRLs + */ +void mbedtls_ssl_conf_ca_chain(mbedtls_ssl_config *conf, + mbedtls_x509_crt *ca_chain, + mbedtls_x509_crl *ca_crl); + +#if defined(MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED) +/** + * \brief Set DN hints sent to client in CertificateRequest message + * + * \note If not set, subject distinguished names (DNs) are taken + * from \c mbedtls_ssl_conf_ca_chain() + * or \c mbedtls_ssl_set_hs_ca_chain()) + * + * \param conf SSL configuration + * \param crt crt chain whose subject DNs are issuer DNs of client certs + * from which the client should select client peer certificate. + */ +static inline +void mbedtls_ssl_conf_dn_hints(mbedtls_ssl_config *conf, + const mbedtls_x509_crt *crt) +{ + conf->MBEDTLS_PRIVATE(dn_hints) = crt; +} +#endif /* MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */ + +#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) +/** + * \brief Set the trusted certificate callback. + * + * This API allows to register the set of trusted certificates + * through a callback, instead of a linked list as configured + * by mbedtls_ssl_conf_ca_chain(). + * + * This is useful for example in contexts where a large number + * of CAs are used, and the inefficiency of maintaining them + * in a linked list cannot be tolerated. It is also useful when + * the set of trusted CAs needs to be modified frequently. + * + * See the documentation of `mbedtls_x509_crt_ca_cb_t` for + * more information. + * + * \param conf The SSL configuration to register the callback with. + * \param f_ca_cb The trusted certificate callback to use when verifying + * certificate chains. + * \param p_ca_cb The context to be passed to \p f_ca_cb (for example, + * a reference to a trusted CA database). + * + * \note This API is incompatible with mbedtls_ssl_conf_ca_chain(): + * Any call to this function overwrites the values set through + * earlier calls to mbedtls_ssl_conf_ca_chain() or + * mbedtls_ssl_conf_ca_cb(). + * + * \note This API is incompatible with CA indication in + * CertificateRequest messages: A server-side SSL context which + * is bound to an SSL configuration that uses a CA callback + * configured via mbedtls_ssl_conf_ca_cb(), and which requires + * client authentication, will send an empty CA list in the + * corresponding CertificateRequest message. + * + * \note This API is incompatible with mbedtls_ssl_set_hs_ca_chain(): + * If an SSL context is bound to an SSL configuration which uses + * CA callbacks configured via mbedtls_ssl_conf_ca_cb(), then + * calls to mbedtls_ssl_set_hs_ca_chain() have no effect. + * + * \note The use of this API disables the use of restartable ECC + * during X.509 CRT signature verification (but doesn't affect + * other uses). + * + * \warning This API is incompatible with the use of CRLs. Any call to + * mbedtls_ssl_conf_ca_cb() unsets CRLs configured through + * earlier calls to mbedtls_ssl_conf_ca_chain(). + * + * \warning In multi-threaded environments, the callback \p f_ca_cb + * must be thread-safe, and it is the user's responsibility + * to guarantee this (for example through a mutex + * contained in the callback context pointed to by \p p_ca_cb). + */ +void mbedtls_ssl_conf_ca_cb(mbedtls_ssl_config *conf, + mbedtls_x509_crt_ca_cb_t f_ca_cb, + void *p_ca_cb); +#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ + +/** + * \brief Set own certificate chain and private key + * + * \note own_cert should contain in order from the bottom up your + * certificate chain. The top certificate (self-signed) + * can be omitted. + * + * \note On server, this function can be called multiple times to + * provision more than one cert/key pair (eg one ECDSA, one + * RSA with SHA-256, one RSA with SHA-1). An adequate + * certificate will be selected according to the client's + * advertised capabilities. In case multiple certificates are + * adequate, preference is given to the one set by the first + * call to this function, then second, etc. + * + * \note On client, only the first call has any effect. That is, + * only one client certificate can be provisioned. The + * server's preferences in its CertificateRequest message will + * be ignored and our only cert will be sent regardless of + * whether it matches those preferences - the server can then + * decide what it wants to do with it. + * + * \note The provided \p pk_key needs to match the public key in the + * first certificate in \p own_cert, or all handshakes using + * that certificate will fail. It is your responsibility + * to ensure that; this function will not perform any check. + * You may use mbedtls_pk_check_pair() in order to perform + * this check yourself, but be aware that this function can + * be computationally expensive on some key types. + * + * \param conf SSL configuration + * \param own_cert own public certificate chain + * \param pk_key own private key + * + * \return 0 on success or MBEDTLS_ERR_SSL_ALLOC_FAILED + */ +int mbedtls_ssl_conf_own_cert(mbedtls_ssl_config *conf, + mbedtls_x509_crt *own_cert, + mbedtls_pk_context *pk_key); +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +#if defined(MBEDTLS_SSL_HANDSHAKE_WITH_PSK_ENABLED) +/** + * \brief Configure pre-shared keys (PSKs) and their + * identities to be used in PSK-based ciphersuites. + * + * Only one PSK can be registered, through either + * mbedtls_ssl_conf_psk() or mbedtls_ssl_conf_psk_opaque(). + * If you attempt to register more than one PSK, this function + * fails, though this may change in future versions, which + * may add support for multiple PSKs. + * + * \note This is mainly useful for clients. Servers will usually + * want to use \c mbedtls_ssl_conf_psk_cb() instead. + * + * \note A PSK set by \c mbedtls_ssl_set_hs_psk() in the PSK callback + * takes precedence over a PSK configured by this function. + * + * \param conf The SSL configuration to register the PSK with. + * \param psk The pointer to the pre-shared key to use. + * \param psk_len The length of the pre-shared key in bytes. + * \param psk_identity The pointer to the pre-shared key identity. + * \param psk_identity_len The length of the pre-shared key identity + * in bytes. + * + * \note The PSK and its identity are copied internally and + * hence need not be preserved by the caller for the lifetime + * of the SSL configuration. + * + * \return \c 0 if successful. + * \return #MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE if no more PSKs + * can be configured. In this case, the old PSK(s) remain intact. + * \return Another negative error code on other kinds of failure. + */ +int mbedtls_ssl_conf_psk(mbedtls_ssl_config *conf, + const unsigned char *psk, size_t psk_len, + const unsigned char *psk_identity, size_t psk_identity_len); + +#if defined(MBEDTLS_USE_PSA_CRYPTO) +/** + * \brief Configure one or more opaque pre-shared keys (PSKs) and + * their identities to be used in PSK-based ciphersuites. + * + * Only one PSK can be registered, through either + * mbedtls_ssl_conf_psk() or mbedtls_ssl_conf_psk_opaque(). + * If you attempt to register more than one PSK, this function + * fails, though this may change in future versions, which + * may add support for multiple PSKs. + * + * \note This is mainly useful for clients. Servers will usually + * want to use \c mbedtls_ssl_conf_psk_cb() instead. + * + * \note An opaque PSK set by \c mbedtls_ssl_set_hs_psk_opaque() in + * the PSK callback takes precedence over an opaque PSK + * configured by this function. + * + * \param conf The SSL configuration to register the PSK with. + * \param psk The identifier of the key slot holding the PSK. + * Until \p conf is destroyed or this function is successfully + * called again, the key slot \p psk must be populated with a + * key of type PSA_ALG_CATEGORY_KEY_DERIVATION whose policy + * allows its use for the key derivation algorithm applied + * in the handshake. + * \param psk_identity The pointer to the pre-shared key identity. + * \param psk_identity_len The length of the pre-shared key identity + * in bytes. + * + * \note The PSK identity hint is copied internally and hence need + * not be preserved by the caller for the lifetime of the + * SSL configuration. + * + * \return \c 0 if successful. + * \return #MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE if no more PSKs + * can be configured. In this case, the old PSK(s) remain intact. + * \return Another negative error code on other kinds of failure. + */ +int mbedtls_ssl_conf_psk_opaque(mbedtls_ssl_config *conf, + mbedtls_svc_key_id_t psk, + const unsigned char *psk_identity, + size_t psk_identity_len); +#endif /* MBEDTLS_USE_PSA_CRYPTO */ + +/** + * \brief Set the pre-shared Key (PSK) for the current handshake. + * + * \note This should only be called inside the PSK callback, + * i.e. the function passed to \c mbedtls_ssl_conf_psk_cb(). + * + * \note A PSK set by this function takes precedence over a PSK + * configured by \c mbedtls_ssl_conf_psk(). + * + * \param ssl The SSL context to configure a PSK for. + * \param psk The pointer to the pre-shared key. + * \param psk_len The length of the pre-shared key in bytes. + * + * \return \c 0 if successful. + * \return An \c MBEDTLS_ERR_SSL_XXX error code on failure. + */ +int mbedtls_ssl_set_hs_psk(mbedtls_ssl_context *ssl, + const unsigned char *psk, size_t psk_len); + +#if defined(MBEDTLS_USE_PSA_CRYPTO) +/** + * \brief Set an opaque pre-shared Key (PSK) for the current handshake. + * + * \note This should only be called inside the PSK callback, + * i.e. the function passed to \c mbedtls_ssl_conf_psk_cb(). + * + * \note An opaque PSK set by this function takes precedence over an + * opaque PSK configured by \c mbedtls_ssl_conf_psk_opaque(). + * + * \param ssl The SSL context to configure a PSK for. + * \param psk The identifier of the key slot holding the PSK. + * For the duration of the current handshake, the key slot + * must be populated with a key of type + * PSA_ALG_CATEGORY_KEY_DERIVATION whose policy allows its + * use for the key derivation algorithm + * applied in the handshake. + * + * \return \c 0 if successful. + * \return An \c MBEDTLS_ERR_SSL_XXX error code on failure. + */ +int mbedtls_ssl_set_hs_psk_opaque(mbedtls_ssl_context *ssl, + mbedtls_svc_key_id_t psk); +#endif /* MBEDTLS_USE_PSA_CRYPTO */ + +#if defined(MBEDTLS_SSL_SRV_C) +/** + * \brief Set the PSK callback (server-side only). + * + * If set, the PSK callback is called for each + * handshake where a PSK-based ciphersuite was negotiated. + * The caller provides the identity received and wants to + * receive the actual PSK data and length. + * + * The callback has the following parameters: + * - \c void*: The opaque pointer \p p_psk. + * - \c mbedtls_ssl_context*: The SSL context to which + * the operation applies. + * - \c const unsigned char*: The PSK identity + * selected by the client. + * - \c size_t: The length of the PSK identity + * selected by the client. + * + * If a valid PSK identity is found, the callback should use + * \c mbedtls_ssl_set_hs_psk() or + * \c mbedtls_ssl_set_hs_psk_opaque() + * on the SSL context to set the correct PSK and return \c 0. + * Any other return value will result in a denied PSK identity. + * + * \note A dynamic PSK (i.e. set by the PSK callback) takes + * precedence over a static PSK (i.e. set by + * \c mbedtls_ssl_conf_psk() or + * \c mbedtls_ssl_conf_psk_opaque()). + * This means that if you set a PSK callback using this + * function, you don't need to set a PSK using + * \c mbedtls_ssl_conf_psk() or + * \c mbedtls_ssl_conf_psk_opaque()). + * + * \param conf The SSL configuration to register the callback with. + * \param f_psk The callback for selecting and setting the PSK based + * in the PSK identity chosen by the client. + * \param p_psk A pointer to an opaque structure to be passed to + * the callback, for example a PSK store. + */ +void mbedtls_ssl_conf_psk_cb(mbedtls_ssl_config *conf, + int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *, + size_t), + void *p_psk); +#endif /* MBEDTLS_SSL_SRV_C */ +#endif /* MBEDTLS_SSL_HANDSHAKE_WITH_PSK_ENABLED */ + +#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) +/** + * \brief Set the Diffie-Hellman public P and G values + * from big-endian binary presentations. + * (Default values: MBEDTLS_DHM_RFC3526_MODP_2048_[PG]_BIN) + * + * \param conf SSL configuration + * \param dhm_P Diffie-Hellman-Merkle modulus in big-endian binary form + * \param P_len Length of DHM modulus + * \param dhm_G Diffie-Hellman-Merkle generator in big-endian binary form + * \param G_len Length of DHM generator + * + * \return 0 if successful + */ +int mbedtls_ssl_conf_dh_param_bin(mbedtls_ssl_config *conf, + const unsigned char *dhm_P, size_t P_len, + const unsigned char *dhm_G, size_t G_len); + +/** + * \brief Set the Diffie-Hellman public P and G values, + * read from existing context (server-side only) + * + * \param conf SSL configuration + * \param dhm_ctx Diffie-Hellman-Merkle context + * + * \return 0 if successful + */ +int mbedtls_ssl_conf_dh_param_ctx(mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx); +#endif /* MBEDTLS_DHM_C && defined(MBEDTLS_SSL_SRV_C) */ + +#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C) +/** + * \brief Set the minimum length for Diffie-Hellman parameters. + * (Client-side only.) + * (Default: 1024 bits.) + * + * \param conf SSL configuration + * \param bitlen Minimum bit length of the DHM prime + */ +void mbedtls_ssl_conf_dhm_min_bitlen(mbedtls_ssl_config *conf, + unsigned int bitlen); +#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */ + +#if defined(MBEDTLS_ECP_C) +#if !defined(MBEDTLS_DEPRECATED_REMOVED) +/** + * \brief Set the allowed curves in order of preference. + * + * On server: this only affects selection of the ECDHE curve; + * the curves used for ECDH and ECDSA are determined by the + * list of available certificates instead. + * + * On client: this affects the list of curves offered for any + * use. The server can override our preference order. + * + * Both sides: limits the set of curves accepted for use in + * ECDHE and in the peer's end-entity certificate. + * + * \deprecated Superseded by mbedtls_ssl_conf_groups(). + * + * \note This has no influence on which curves are allowed inside the + * certificate chains, see \c mbedtls_ssl_conf_cert_profile() + * for that. For the end-entity certificate however, the key + * will be accepted only if it is allowed both by this list + * and by the cert profile. + * + * \note This list should be ordered by decreasing preference + * (preferred curve first). + * + * \note The default list is the same set of curves that + * #mbedtls_x509_crt_profile_default allows, plus + * ECDHE-only curves selected according to the same criteria. + * The order favors curves with the lowest resource usage. + * + * \note New minor versions of Mbed TLS may extend this list, + * for example if new curves are added to the library. + * New minor versions of Mbed TLS will not remove items + * from this list unless serious security concerns require it. + * New minor versions of Mbed TLS may change the order in + * keeping with the general principle of favoring the lowest + * resource usage. + * + * \param conf SSL configuration + * \param curves Ordered list of allowed curves, + * terminated by MBEDTLS_ECP_DP_NONE. + */ +void MBEDTLS_DEPRECATED mbedtls_ssl_conf_curves(mbedtls_ssl_config *conf, + const mbedtls_ecp_group_id *curves); +#endif /* MBEDTLS_DEPRECATED_REMOVED */ +#endif /* MBEDTLS_ECP_C */ + +/** + * \brief Set the allowed groups in order of preference. + * + * On server: This only affects the choice of key agreement mechanism + * + * On client: this affects the list of groups offered for any + * use. The server can override our preference order. + * + * Both sides: limits the set of groups accepted for use in + * key sharing. + * + * \note This function replaces the deprecated mbedtls_ssl_conf_curves(), + * which only allows ECP curves to be configured. + * + * \note The most recent invocation of either mbedtls_ssl_conf_curves() + * or mbedtls_ssl_conf_groups() nullifies all previous invocations + * of both. + * + * \note This list should be ordered by decreasing preference + * (preferred group first). + * + * \note When this function is not called, a default list is used, + * consisting of all supported curves at 255 bits and above, + * and all supported finite fields at 2048 bits and above. + * The order favors groups with the lowest resource usage. + * + * \note New minor versions of Mbed TLS will not remove items + * from the default list unless serious security concerns require it. + * New minor versions of Mbed TLS may change the order in + * keeping with the general principle of favoring the lowest + * resource usage. + * + * \param conf SSL configuration + * \param groups List of allowed groups ordered by preference, terminated by 0. + * Must contain valid IANA NamedGroup IDs (provided via either an integer + * or using MBEDTLS_TLS1_3_NAMED_GROUP_XXX macros). + */ +void mbedtls_ssl_conf_groups(mbedtls_ssl_config *conf, + const uint16_t *groups); + +#if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED) +#if !defined(MBEDTLS_DEPRECATED_REMOVED) && defined(MBEDTLS_SSL_PROTO_TLS1_2) +/** + * \brief Set the allowed hashes for signatures during the handshake. + * + * \note This only affects which hashes are offered and can be used + * for signatures during the handshake. Hashes for message + * authentication and the TLS PRF are controlled by the + * ciphersuite, see \c mbedtls_ssl_conf_ciphersuites(). Hashes + * used for certificate signature are controlled by the + * verification profile, see \c mbedtls_ssl_conf_cert_profile(). + * + * \note This list should be ordered by decreasing preference + * (preferred hash first). + * + * \note By default, all supported hashes whose length is at least + * 256 bits are allowed. This is the same set as the default + * for certificate verification + * (#mbedtls_x509_crt_profile_default). + * The preference order is currently unspecified and may + * change in future versions. + * + * \note New minor versions of Mbed TLS may extend this list, + * for example if new curves are added to the library. + * New minor versions of Mbed TLS will not remove items + * from this list unless serious security concerns require it. + * + * \param conf SSL configuration + * \param hashes Ordered list of allowed signature hashes, + * terminated by \c MBEDTLS_MD_NONE. + */ +void MBEDTLS_DEPRECATED mbedtls_ssl_conf_sig_hashes(mbedtls_ssl_config *conf, + const int *hashes); +#endif /* !MBEDTLS_DEPRECATED_REMOVED && MBEDTLS_SSL_PROTO_TLS1_2 */ + +/** + * \brief Configure allowed signature algorithms for use in TLS 1.3 + * + * \param conf The SSL configuration to use. + * \param sig_algs List of allowed IANA values for TLS 1.3 signature algorithms, + * terminated by \c MBEDTLS_TLS1_3_SIG_NONE. The list must remain + * available throughout the lifetime of the conf object. Supported + * values are available as \c MBEDTLS_TLS1_3_SIG_XXXX + */ +void mbedtls_ssl_conf_sig_algs(mbedtls_ssl_config *conf, + const uint16_t *sig_algs); +#endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */ + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +/** + * \brief Set or reset the hostname to check against the received + * server certificate. It sets the ServerName TLS extension, + * too, if that extension is enabled. (client-side only) + * + * \param ssl SSL context + * \param hostname the server hostname, may be NULL to clear hostname + + * \note Maximum hostname length MBEDTLS_SSL_MAX_HOST_NAME_LEN. + * + * \return 0 if successful, MBEDTLS_ERR_SSL_ALLOC_FAILED on + * allocation failure, MBEDTLS_ERR_SSL_BAD_INPUT_DATA on + * too long input hostname. + * + * Hostname set to the one provided on success (cleared + * when NULL). On allocation failure hostname is cleared. + * On too long input failure, old hostname is unchanged. + */ +int mbedtls_ssl_set_hostname(mbedtls_ssl_context *ssl, const char *hostname); + +/** + * \brief Get the hostname that checked against the received + * server certificate. It is used to set the ServerName + * TLS extension, too, if that extension is enabled. + * (client-side only) + * + * \param ssl SSL context + * + * \return const pointer to the hostname value + */ +static inline const char *mbedtls_ssl_get_hostname(mbedtls_ssl_context *ssl) +{ + return ssl->MBEDTLS_PRIVATE(hostname); +} +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) +/** + * \brief Retrieve SNI extension value for the current handshake. + * Available in \c f_cert_cb of \c mbedtls_ssl_conf_cert_cb(), + * this is the same value passed to \c f_sni callback of + * \c mbedtls_ssl_conf_sni() and may be used instead of + * \c mbedtls_ssl_conf_sni(). + * + * \param ssl SSL context + * \param name_len pointer into which to store length of returned value. + * 0 if SNI extension is not present or not yet processed. + * + * \return const pointer to SNI extension value. + * - value is valid only when called in \c f_cert_cb + * registered with \c mbedtls_ssl_conf_cert_cb(). + * - value is NULL if SNI extension is not present. + * - value is not '\0'-terminated. Use \c name_len for len. + * - value must not be freed. + */ +const unsigned char *mbedtls_ssl_get_hs_sni(mbedtls_ssl_context *ssl, + size_t *name_len); + +/** + * \brief Set own certificate and key for the current handshake + * + * \note Same as \c mbedtls_ssl_conf_own_cert() but for use within + * the SNI callback or the certificate selection callback. + * + * \note Passing null \c own_cert clears the certificate list for + * the current handshake. + * + * \param ssl SSL context + * \param own_cert own public certificate chain + * \param pk_key own private key + * + * \return 0 on success or MBEDTLS_ERR_SSL_ALLOC_FAILED + */ +int mbedtls_ssl_set_hs_own_cert(mbedtls_ssl_context *ssl, + mbedtls_x509_crt *own_cert, + mbedtls_pk_context *pk_key); + +/** + * \brief Set the data required to verify peer certificate for the + * current handshake + * + * \note Same as \c mbedtls_ssl_conf_ca_chain() but for use within + * the SNI callback or the certificate selection callback. + * + * \param ssl SSL context + * \param ca_chain trusted CA chain (meaning all fully trusted top-level CAs) + * \param ca_crl trusted CA CRLs + */ +void mbedtls_ssl_set_hs_ca_chain(mbedtls_ssl_context *ssl, + mbedtls_x509_crt *ca_chain, + mbedtls_x509_crl *ca_crl); + +#if defined(MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED) +/** + * \brief Set DN hints sent to client in CertificateRequest message + * + * \note Same as \c mbedtls_ssl_conf_dn_hints() but for use within + * the SNI callback or the certificate selection callback. + * + * \param ssl SSL context + * \param crt crt chain whose subject DNs are issuer DNs of client certs + * from which the client should select client peer certificate. + */ +void mbedtls_ssl_set_hs_dn_hints(mbedtls_ssl_context *ssl, + const mbedtls_x509_crt *crt); +#endif /* MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */ + +/** + * \brief Set authmode for the current handshake. + * + * \note Same as \c mbedtls_ssl_conf_authmode() but for use within + * the SNI callback or the certificate selection callback. + * + * \param ssl SSL context + * \param authmode MBEDTLS_SSL_VERIFY_NONE, MBEDTLS_SSL_VERIFY_OPTIONAL or + * MBEDTLS_SSL_VERIFY_REQUIRED + */ +void mbedtls_ssl_set_hs_authmode(mbedtls_ssl_context *ssl, + int authmode); + +/** + * \brief Set server side ServerName TLS extension callback + * (optional, server-side only). + * + * If set, the ServerName callback is called whenever the + * server receives a ServerName TLS extension from the client + * during a handshake. The ServerName callback has the + * following parameters: (void *parameter, mbedtls_ssl_context *ssl, + * const unsigned char *hostname, size_t len). If a suitable + * certificate is found, the callback must set the + * certificate(s) and key(s) to use with \c + * mbedtls_ssl_set_hs_own_cert() (can be called repeatedly), + * and may optionally adjust the CA and associated CRL with \c + * mbedtls_ssl_set_hs_ca_chain() as well as the client + * authentication mode with \c mbedtls_ssl_set_hs_authmode(), + * then must return 0. If no matching name is found, the + * callback may return non-zero to abort the handshake. + * + * \param conf SSL configuration + * \param f_sni verification function + * \param p_sni verification parameter + */ +void mbedtls_ssl_conf_sni(mbedtls_ssl_config *conf, + int (*f_sni)(void *, mbedtls_ssl_context *, const unsigned char *, + size_t), + void *p_sni); +#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ + +#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) +/** + * \brief Set the EC J-PAKE password for current handshake. + * + * \note An internal copy is made, and destroyed as soon as the + * handshake is completed, or when the SSL context is reset or + * freed. + * + * \note The SSL context needs to be already set up. The right place + * to call this function is between \c mbedtls_ssl_setup() or + * \c mbedtls_ssl_reset() and \c mbedtls_ssl_handshake(). + * Password cannot be empty (see RFC 8236). + * + * \param ssl SSL context + * \param pw EC J-PAKE password (pre-shared secret). It cannot be empty + * \param pw_len length of pw in bytes + * + * \return 0 on success, or a negative error code. + */ +int mbedtls_ssl_set_hs_ecjpake_password(mbedtls_ssl_context *ssl, + const unsigned char *pw, + size_t pw_len); + +/** + * \brief Set the EC J-PAKE opaque password for current handshake. + * + * \note The key must remain valid until the handshake is over. + * + * \note The SSL context needs to be already set up. The right place + * to call this function is between \c mbedtls_ssl_setup() or + * \c mbedtls_ssl_reset() and \c mbedtls_ssl_handshake(). + * + * \param ssl SSL context + * \param pwd EC J-PAKE opaque password + * + * \return 0 on success, or a negative error code. + */ +int mbedtls_ssl_set_hs_ecjpake_password_opaque(mbedtls_ssl_context *ssl, + mbedtls_svc_key_id_t pwd); +#endif /*MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ + +#if defined(MBEDTLS_SSL_ALPN) +/** + * \brief Set the supported Application Layer Protocols. + * + * \param conf SSL configuration + * \param protos Pointer to a NULL-terminated list of supported protocols, + * in decreasing preference order. The pointer to the list is + * recorded by the library for later reference as required, so + * the lifetime of the table must be at least as long as the + * lifetime of the SSL configuration structure. + * + * \return 0 on success, or MBEDTLS_ERR_SSL_BAD_INPUT_DATA. + */ +int mbedtls_ssl_conf_alpn_protocols(mbedtls_ssl_config *conf, const char **protos); + +/** + * \brief Get the name of the negotiated Application Layer Protocol. + * This function should be called after the handshake is + * completed. + * + * \param ssl SSL context + * + * \return Protocol name, or NULL if no protocol was negotiated. + */ +const char *mbedtls_ssl_get_alpn_protocol(const mbedtls_ssl_context *ssl); +#endif /* MBEDTLS_SSL_ALPN */ + +#if defined(MBEDTLS_SSL_DTLS_SRTP) +#if defined(MBEDTLS_DEBUG_C) +static inline const char *mbedtls_ssl_get_srtp_profile_as_string(mbedtls_ssl_srtp_profile profile) +{ + switch (profile) { + case MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_80: + return "MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_80"; + case MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_32: + return "MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_32"; + case MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_80: + return "MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_80"; + case MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_32: + return "MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_32"; + default: break; + } + return ""; +} +#endif /* MBEDTLS_DEBUG_C */ +/** + * \brief Manage support for mki(master key id) value + * in use_srtp extension. + * MKI is an optional part of SRTP used for key management + * and re-keying. See RFC3711 section 3.1 for details. + * The default value is + * #MBEDTLS_SSL_DTLS_SRTP_MKI_UNSUPPORTED. + * + * \param conf The SSL configuration to manage mki support. + * \param support_mki_value Enable or disable mki usage. Values are + * #MBEDTLS_SSL_DTLS_SRTP_MKI_UNSUPPORTED + * or #MBEDTLS_SSL_DTLS_SRTP_MKI_SUPPORTED. + */ +void mbedtls_ssl_conf_srtp_mki_value_supported(mbedtls_ssl_config *conf, + int support_mki_value); + +/** + * \brief Set the supported DTLS-SRTP protection profiles. + * + * \param conf SSL configuration + * \param profiles Pointer to a List of MBEDTLS_TLS_SRTP_UNSET terminated + * supported protection profiles + * in decreasing preference order. + * The pointer to the list is recorded by the library + * for later reference as required, so the lifetime + * of the table must be at least as long as the lifetime + * of the SSL configuration structure. + * The list must not hold more than + * MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH elements + * (excluding the terminating MBEDTLS_TLS_SRTP_UNSET). + * + * \return 0 on success + * \return #MBEDTLS_ERR_SSL_BAD_INPUT_DATA when the list of + * protection profiles is incorrect. + */ +int mbedtls_ssl_conf_dtls_srtp_protection_profiles + (mbedtls_ssl_config *conf, + const mbedtls_ssl_srtp_profile *profiles); + +/** + * \brief Set the mki_value for the current DTLS-SRTP session. + * + * \param ssl SSL context to use. + * \param mki_value The MKI value to set. + * \param mki_len The length of the MKI value. + * + * \note This function is relevant on client side only. + * The server discovers the mki value during handshake. + * A mki value set on server side using this function + * is ignored. + * + * \return 0 on success + * \return #MBEDTLS_ERR_SSL_BAD_INPUT_DATA + * \return #MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE + */ +int mbedtls_ssl_dtls_srtp_set_mki_value(mbedtls_ssl_context *ssl, + unsigned char *mki_value, + uint16_t mki_len); +/** + * \brief Get the negotiated DTLS-SRTP information: + * Protection profile and MKI value. + * + * \warning This function must be called after the handshake is + * completed. The value returned by this function must + * not be trusted or acted upon before the handshake completes. + * + * \param ssl The SSL context to query. + * \param dtls_srtp_info The negotiated DTLS-SRTP information: + * - Protection profile in use. + * A direct mapping of the iana defined value for protection + * profile on an uint16_t. + http://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml + * #MBEDTLS_TLS_SRTP_UNSET if the use of SRTP was not negotiated + * or peer's Hello packet was not parsed yet. + * - mki size and value( if size is > 0 ). + */ +void mbedtls_ssl_get_dtls_srtp_negotiation_result(const mbedtls_ssl_context *ssl, + mbedtls_dtls_srtp_info *dtls_srtp_info); +#endif /* MBEDTLS_SSL_DTLS_SRTP */ + +#if !defined(MBEDTLS_DEPRECATED_REMOVED) +/** + * \brief Set the maximum supported version sent from the client side + * and/or accepted at the server side. + * + * See also the documentation of mbedtls_ssl_conf_min_version(). + * + * \note This ignores ciphersuites from higher versions. + * + * \note This function is deprecated and has been replaced by + * \c mbedtls_ssl_conf_max_tls_version(). + * + * \param conf SSL configuration + * \param major Major version number (#MBEDTLS_SSL_MAJOR_VERSION_3) + * \param minor Minor version number + * (#MBEDTLS_SSL_MINOR_VERSION_3 for (D)TLS 1.2, + * #MBEDTLS_SSL_MINOR_VERSION_4 for TLS 1.3) + */ +void MBEDTLS_DEPRECATED mbedtls_ssl_conf_max_version(mbedtls_ssl_config *conf, int major, + int minor); +#endif /* MBEDTLS_DEPRECATED_REMOVED */ + +/** + * \brief Set the maximum supported version sent from the client side + * and/or accepted at the server side. + * + * \note After the handshake, you can call + * mbedtls_ssl_get_version_number() to see what version was + * negotiated. + * + * \param conf SSL configuration + * \param tls_version TLS protocol version number (\c mbedtls_ssl_protocol_version) + * (#MBEDTLS_SSL_VERSION_UNKNOWN is not valid) + */ +static inline void mbedtls_ssl_conf_max_tls_version(mbedtls_ssl_config *conf, + mbedtls_ssl_protocol_version tls_version) +{ + conf->MBEDTLS_PRIVATE(max_tls_version) = tls_version; +} + +#if !defined(MBEDTLS_DEPRECATED_REMOVED) +/** + * \brief Set the minimum accepted SSL/TLS protocol version + * + * \note By default, all supported versions are accepted. + * Future versions of the library may disable older + * protocol versions by default if they become deprecated. + * + * \note The following versions are supported (if enabled at + * compile time): + * - (D)TLS 1.2: \p major = #MBEDTLS_SSL_MAJOR_VERSION_3, + * \p minor = #MBEDTLS_SSL_MINOR_VERSION_3 + * - TLS 1.3: \p major = #MBEDTLS_SSL_MAJOR_VERSION_3, + * \p minor = #MBEDTLS_SSL_MINOR_VERSION_4 + * + * Note that the numbers in the constant names are the + * TLS internal protocol numbers, and the minor versions + * differ by one from the human-readable versions! + * + * \note Input outside of the SSL_MAX_XXXXX_VERSION and + * SSL_MIN_XXXXX_VERSION range is ignored. + * + * \note After the handshake, you can call + * mbedtls_ssl_get_version_number() to see what version was + * negotiated. + * + * \note This function is deprecated and has been replaced by + * \c mbedtls_ssl_conf_min_tls_version(). + * + * \param conf SSL configuration + * \param major Major version number (#MBEDTLS_SSL_MAJOR_VERSION_3) + * \param minor Minor version number + * (#MBEDTLS_SSL_MINOR_VERSION_3 for (D)TLS 1.2, + * #MBEDTLS_SSL_MINOR_VERSION_4 for TLS 1.3) + */ +void MBEDTLS_DEPRECATED mbedtls_ssl_conf_min_version(mbedtls_ssl_config *conf, int major, + int minor); +#endif /* MBEDTLS_DEPRECATED_REMOVED */ + +/** + * \brief Set the minimum supported version sent from the client side + * and/or accepted at the server side. + * + * \note After the handshake, you can call + * mbedtls_ssl_get_version_number() to see what version was + * negotiated. + * + * \param conf SSL configuration + * \param tls_version TLS protocol version number (\c mbedtls_ssl_protocol_version) + * (#MBEDTLS_SSL_VERSION_UNKNOWN is not valid) + */ +static inline void mbedtls_ssl_conf_min_tls_version(mbedtls_ssl_config *conf, + mbedtls_ssl_protocol_version tls_version) +{ + conf->MBEDTLS_PRIVATE(min_tls_version) = tls_version; +} + +#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) +/** + * \brief Enable or disable Encrypt-then-MAC + * (Default: MBEDTLS_SSL_ETM_ENABLED) + * + * \note This should always be enabled, it is a security + * improvement, and should not cause any interoperability + * issue (used only if the peer supports it too). + * + * \param conf SSL configuration + * \param etm MBEDTLS_SSL_ETM_ENABLED or MBEDTLS_SSL_ETM_DISABLED + */ +void mbedtls_ssl_conf_encrypt_then_mac(mbedtls_ssl_config *conf, char etm); +#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ + +#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) +/** + * \brief Enable or disable Extended Master Secret negotiation. + * (Default: MBEDTLS_SSL_EXTENDED_MS_ENABLED) + * + * \note This should always be enabled, it is a security fix to the + * protocol, and should not cause any interoperability issue + * (used only if the peer supports it too). + * + * \param conf SSL configuration + * \param ems MBEDTLS_SSL_EXTENDED_MS_ENABLED or MBEDTLS_SSL_EXTENDED_MS_DISABLED + */ +void mbedtls_ssl_conf_extended_master_secret(mbedtls_ssl_config *conf, char ems); +#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ + +#if defined(MBEDTLS_SSL_SRV_C) +/** + * \brief Whether to send a list of acceptable CAs in + * CertificateRequest messages. + * (Default: do send) + * + * \param conf SSL configuration + * \param cert_req_ca_list MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED or + * MBEDTLS_SSL_CERT_REQ_CA_LIST_DISABLED + */ +void mbedtls_ssl_conf_cert_req_ca_list(mbedtls_ssl_config *conf, + char cert_req_ca_list); +#endif /* MBEDTLS_SSL_SRV_C */ + +#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) +/** + * \brief Set the maximum fragment length to emit and/or negotiate. + * (Typical: the smaller of #MBEDTLS_SSL_IN_CONTENT_LEN and + * #MBEDTLS_SSL_OUT_CONTENT_LEN, usually `2^14` bytes) + * (Server: set maximum fragment length to emit, + * usually negotiated by the client during handshake) + * (Client: set maximum fragment length to emit *and* + * negotiate with the server during handshake) + * (Default: #MBEDTLS_SSL_MAX_FRAG_LEN_NONE) + * + * \note On the client side, the maximum fragment length extension + * *will not* be used, unless the maximum fragment length has + * been set via this function to a value different than + * #MBEDTLS_SSL_MAX_FRAG_LEN_NONE. + * + * \note With TLS, this currently only affects ApplicationData (sent + * with \c mbedtls_ssl_read()), not handshake messages. + * With DTLS, this affects both ApplicationData and handshake. + * + * \note This sets the maximum length for a record's payload, + * excluding record overhead that will be added to it, see + * \c mbedtls_ssl_get_record_expansion(). + * + * \note For DTLS, it is also possible to set a limit for the total + * size of datagrams passed to the transport layer, including + * record overhead, see \c mbedtls_ssl_set_mtu(). + * + * \param conf SSL configuration + * \param mfl_code Code for maximum fragment length (allowed values: + * MBEDTLS_SSL_MAX_FRAG_LEN_512, MBEDTLS_SSL_MAX_FRAG_LEN_1024, + * MBEDTLS_SSL_MAX_FRAG_LEN_2048, MBEDTLS_SSL_MAX_FRAG_LEN_4096) + * + * \return 0 if successful or MBEDTLS_ERR_SSL_BAD_INPUT_DATA + */ +int mbedtls_ssl_conf_max_frag_len(mbedtls_ssl_config *conf, unsigned char mfl_code); +#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ + +#if defined(MBEDTLS_SSL_SRV_C) +/** + * \brief Pick the ciphersuites order according to the second parameter + * in the SSL Server module (MBEDTLS_SSL_SRV_C). + * (Default, if never called: MBEDTLS_SSL_SRV_CIPHERSUITE_ORDER_SERVER) + * + * \param conf SSL configuration + * \param order Server or client (MBEDTLS_SSL_SRV_CIPHERSUITE_ORDER_SERVER + * or MBEDTLS_SSL_SRV_CIPHERSUITE_ORDER_CLIENT) + */ +void mbedtls_ssl_conf_preference_order(mbedtls_ssl_config *conf, int order); +#endif /* MBEDTLS_SSL_SRV_C */ + +#if defined(MBEDTLS_SSL_SESSION_TICKETS) && \ + defined(MBEDTLS_SSL_CLI_C) +/** + * \brief Enable / Disable session tickets (client only). + * (Default: MBEDTLS_SSL_SESSION_TICKETS_ENABLED.) + * + * \note On server, use \c mbedtls_ssl_conf_session_tickets_cb(). + * + * \param conf SSL configuration + * \param use_tickets Enable or disable (MBEDTLS_SSL_SESSION_TICKETS_ENABLED or + * MBEDTLS_SSL_SESSION_TICKETS_DISABLED) + */ +void mbedtls_ssl_conf_session_tickets(mbedtls_ssl_config *conf, int use_tickets); +#endif /* MBEDTLS_SSL_SESSION_TICKETS && + MBEDTLS_SSL_CLI_C */ + +#if defined(MBEDTLS_SSL_SESSION_TICKETS) && \ + defined(MBEDTLS_SSL_SRV_C) && \ + defined(MBEDTLS_SSL_PROTO_TLS1_3) +/** + * \brief Number of NewSessionTicket messages for the server to send + * after handshake completion. + * + * \note The default value is + * \c MBEDTLS_SSL_TLS1_3_DEFAULT_NEW_SESSION_TICKETS. + * + * \note In case of a session resumption, this setting only partially apply. + * At most one ticket is sent in that case to just renew the pool of + * tickets of the client. The rationale is to avoid the number of + * tickets on the server to become rapidly out of control when the + * server has the same configuration for all its connection instances. + * + * \param conf SSL configuration + * \param num_tickets Number of NewSessionTicket. + * + */ +void mbedtls_ssl_conf_new_session_tickets(mbedtls_ssl_config *conf, + uint16_t num_tickets); +#endif /* MBEDTLS_SSL_SESSION_TICKETS && + MBEDTLS_SSL_SRV_C && + MBEDTLS_SSL_PROTO_TLS1_3*/ + +#if defined(MBEDTLS_SSL_RENEGOTIATION) +/** + * \brief Enable / Disable renegotiation support for connection when + * initiated by peer + * (Default: MBEDTLS_SSL_RENEGOTIATION_DISABLED) + * + * \warning It is recommended to always disable renegotiation unless you + * know you need it and you know what you're doing. In the + * past, there have been several issues associated with + * renegotiation or a poor understanding of its properties. + * + * \note Server-side, enabling renegotiation also makes the server + * susceptible to a resource DoS by a malicious client. + * + * \param conf SSL configuration + * \param renegotiation Enable or disable (MBEDTLS_SSL_RENEGOTIATION_ENABLED or + * MBEDTLS_SSL_RENEGOTIATION_DISABLED) + */ +void mbedtls_ssl_conf_renegotiation(mbedtls_ssl_config *conf, int renegotiation); +#endif /* MBEDTLS_SSL_RENEGOTIATION */ + +/** + * \brief Prevent or allow legacy renegotiation. + * (Default: MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION) + * + * MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION allows connections to + * be established even if the peer does not support + * secure renegotiation, but does not allow renegotiation + * to take place if not secure. + * (Interoperable and secure option) + * + * MBEDTLS_SSL_LEGACY_ALLOW_RENEGOTIATION allows renegotiations + * with non-upgraded peers. Allowing legacy renegotiation + * makes the connection vulnerable to specific man in the + * middle attacks. (See RFC 5746) + * (Most interoperable and least secure option) + * + * MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE breaks off connections + * if peer does not support secure renegotiation. Results + * in interoperability issues with non-upgraded peers + * that do not support renegotiation altogether. + * (Most secure option, interoperability issues) + * + * \param conf SSL configuration + * \param allow_legacy Prevent or allow (SSL_NO_LEGACY_RENEGOTIATION, + * SSL_ALLOW_LEGACY_RENEGOTIATION or + * MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE) + */ +void mbedtls_ssl_conf_legacy_renegotiation(mbedtls_ssl_config *conf, int allow_legacy); + +#if defined(MBEDTLS_SSL_RENEGOTIATION) +/** + * \brief Enforce renegotiation requests. + * (Default: enforced, max_records = 16) + * + * When we request a renegotiation, the peer can comply or + * ignore the request. This function allows us to decide + * whether to enforce our renegotiation requests by closing + * the connection if the peer doesn't comply. + * + * However, records could already be in transit from the peer + * when the request is emitted. In order to increase + * reliability, we can accept a number of records before the + * expected handshake records. + * + * The optimal value is highly dependent on the specific usage + * scenario. + * + * \note With DTLS and server-initiated renegotiation, the + * HelloRequest is retransmitted every time mbedtls_ssl_read() times + * out or receives Application Data, until: + * - max_records records have beens seen, if it is >= 0, or + * - the number of retransmits that would happen during an + * actual handshake has been reached. + * Please remember the request might be lost a few times + * if you consider setting max_records to a really low value. + * + * \warning On client, the grace period can only happen during + * mbedtls_ssl_read(), as opposed to mbedtls_ssl_write() and mbedtls_ssl_renegotiate() + * which always behave as if max_record was 0. The reason is, + * if we receive application data from the server, we need a + * place to write it, which only happens during mbedtls_ssl_read(). + * + * \param conf SSL configuration + * \param max_records Use MBEDTLS_SSL_RENEGOTIATION_NOT_ENFORCED if you don't want to + * enforce renegotiation, or a non-negative value to enforce + * it but allow for a grace period of max_records records. + */ +void mbedtls_ssl_conf_renegotiation_enforced(mbedtls_ssl_config *conf, int max_records); + +/** + * \brief Set record counter threshold for periodic renegotiation. + * (Default: 2^48 - 1) + * + * Renegotiation is automatically triggered when a record + * counter (outgoing or incoming) crosses the defined + * threshold. The default value is meant to prevent the + * connection from being closed when the counter is about to + * reached its maximal value (it is not allowed to wrap). + * + * Lower values can be used to enforce policies such as "keys + * must be refreshed every N packets with cipher X". + * + * The renegotiation period can be disabled by setting + * conf->disable_renegotiation to + * MBEDTLS_SSL_RENEGOTIATION_DISABLED. + * + * \note When the configured transport is + * MBEDTLS_SSL_TRANSPORT_DATAGRAM the maximum renegotiation + * period is 2^48 - 1, and for MBEDTLS_SSL_TRANSPORT_STREAM, + * the maximum renegotiation period is 2^64 - 1. + * + * \param conf SSL configuration + * \param period The threshold value: a big-endian 64-bit number. + */ +void mbedtls_ssl_conf_renegotiation_period(mbedtls_ssl_config *conf, + const unsigned char period[8]); +#endif /* MBEDTLS_SSL_RENEGOTIATION */ + +/** + * \brief Check if there is data already read from the + * underlying transport but not yet processed. + * + * \param ssl SSL context + * + * \return 0 if nothing's pending, 1 otherwise. + * + * \note This is different in purpose and behaviour from + * \c mbedtls_ssl_get_bytes_avail in that it considers + * any kind of unprocessed data, not only unread + * application data. If \c mbedtls_ssl_get_bytes + * returns a non-zero value, this function will + * also signal pending data, but the converse does + * not hold. For example, in DTLS there might be + * further records waiting to be processed from + * the current underlying transport's datagram. + * + * \note If this function returns 1 (data pending), this + * does not imply that a subsequent call to + * \c mbedtls_ssl_read will provide any data; + * e.g., the unprocessed data might turn out + * to be an alert or a handshake message. + * + * \note This function is useful in the following situation: + * If the SSL/TLS module successfully returns from an + * operation - e.g. a handshake or an application record + * read - and you're awaiting incoming data next, you + * must not immediately idle on the underlying transport + * to have data ready, but you need to check the value + * of this function first. The reason is that the desired + * data might already be read but not yet processed. + * If, in contrast, a previous call to the SSL/TLS module + * returned MBEDTLS_ERR_SSL_WANT_READ, it is not necessary + * to call this function, as the latter error code entails + * that all internal data has been processed. + * + */ +int mbedtls_ssl_check_pending(const mbedtls_ssl_context *ssl); + +/** + * \brief Return the number of application data bytes + * remaining to be read from the current record. + * + * \param ssl SSL context + * + * \return How many bytes are available in the application + * data record read buffer. + * + * \note When working over a datagram transport, this is + * useful to detect the current datagram's boundary + * in case \c mbedtls_ssl_read has written the maximal + * amount of data fitting into the input buffer. + * + */ +size_t mbedtls_ssl_get_bytes_avail(const mbedtls_ssl_context *ssl); + +/** + * \brief Return the result of the certificate verification + * + * \param ssl The SSL context to use. + * + * \return \c 0 if the certificate verification was successful. + * \return \c -1u if the result is not available. This may happen + * e.g. if the handshake aborts early, or a verification + * callback returned a fatal error. + * \return A bitwise combination of \c MBEDTLS_X509_BADCERT_XXX + * and \c MBEDTLS_X509_BADCRL_XXX failure flags; see x509.h. + */ +uint32_t mbedtls_ssl_get_verify_result(const mbedtls_ssl_context *ssl); + +/** + * \brief Return the id of the current ciphersuite + * + * \param ssl SSL context + * + * \return a ciphersuite id + */ +int mbedtls_ssl_get_ciphersuite_id_from_ssl(const mbedtls_ssl_context *ssl); + +/** + * \brief Return the name of the current ciphersuite + * + * \param ssl SSL context + * + * \return a string containing the ciphersuite name + */ +const char *mbedtls_ssl_get_ciphersuite(const mbedtls_ssl_context *ssl); + + +/** + * \brief Return the (D)TLS protocol version negotiated in the + * given connection. + * + * \note If you call this function too early during the initial + * handshake, before the two sides have agreed on a version, + * this function returns #MBEDTLS_SSL_VERSION_UNKNOWN. + * + * \param ssl The SSL context to query. + * \return The negotiated protocol version. + */ +static inline mbedtls_ssl_protocol_version mbedtls_ssl_get_version_number( + const mbedtls_ssl_context *ssl) +{ + return ssl->MBEDTLS_PRIVATE(tls_version); +} + +/** + * \brief Return the current TLS version + * + * \param ssl SSL context + * + * \return a string containing the TLS version + */ +const char *mbedtls_ssl_get_version(const mbedtls_ssl_context *ssl); + +/** + * \brief Return the (maximum) number of bytes added by the record + * layer: header + encryption/MAC overhead (inc. padding) + * + * \param ssl SSL context + * + * \return Current maximum record expansion in bytes + */ +int mbedtls_ssl_get_record_expansion(const mbedtls_ssl_context *ssl); + +/** + * \brief Return the current maximum outgoing record payload in bytes. + * + * \note The logic to determine the maximum outgoing record payload is + * version-specific. It takes into account various factors, such as + * the mbedtls_config.h setting \c MBEDTLS_SSL_OUT_CONTENT_LEN, extensions + * such as the max fragment length or record size limit extension if + * used, and for DTLS the path MTU as configured and current + * record expansion. + * + * \note With DTLS, \c mbedtls_ssl_write() will return an error if + * called with a larger length value. + * With TLS, \c mbedtls_ssl_write() will fragment the input if + * necessary and return the number of bytes written; it is up + * to the caller to call \c mbedtls_ssl_write() again in + * order to send the remaining bytes if any. + * + * \sa mbedtls_ssl_get_max_out_record_payload() + * \sa mbedtls_ssl_get_record_expansion() + * + * \param ssl SSL context + * + * \return Current maximum payload for an outgoing record, + * or a negative error code. + */ +int mbedtls_ssl_get_max_out_record_payload(const mbedtls_ssl_context *ssl); + +/** + * \brief Return the current maximum incoming record payload in bytes. + * + * \note The logic to determine the maximum incoming record payload is + * version-specific. It takes into account various factors, such as + * the mbedtls_config.h setting \c MBEDTLS_SSL_IN_CONTENT_LEN, extensions + * such as the max fragment length extension or record size limit + * extension if used, and the current record expansion. + * + * \sa mbedtls_ssl_set_mtu() + * \sa mbedtls_ssl_get_max_in_record_payload() + * \sa mbedtls_ssl_get_record_expansion() + * + * \param ssl SSL context + * + * \return Current maximum payload for an incoming record, + * or a negative error code. + */ +int mbedtls_ssl_get_max_in_record_payload(const mbedtls_ssl_context *ssl); + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +/** + * \brief Return the peer certificate from the current connection. + * + * \param ssl The SSL context to use. This must be initialized and setup. + * + * \return The current peer certificate, if available. + * The returned certificate is owned by the SSL context and + * is valid only until the next call to the SSL API. + * \return \c NULL if no peer certificate is available. This might + * be because the chosen ciphersuite doesn't use CRTs + * (PSK-based ciphersuites, for example), or because + * #MBEDTLS_SSL_KEEP_PEER_CERTIFICATE has been disabled, + * allowing the stack to free the peer's CRT to save memory. + * + * \note For one-time inspection of the peer's certificate during + * the handshake, consider registering an X.509 CRT verification + * callback through mbedtls_ssl_conf_verify() instead of calling + * this function. Using mbedtls_ssl_conf_verify() also comes at + * the benefit of allowing you to influence the verification + * process, for example by masking expected and tolerated + * verification failures. + * + * \warning You must not use the pointer returned by this function + * after any further call to the SSL API, including + * mbedtls_ssl_read() and mbedtls_ssl_write(); this is + * because the pointer might change during renegotiation, + * which happens transparently to the user. + * If you want to use the certificate across API calls, + * you must make a copy. + */ +const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert(const mbedtls_ssl_context *ssl); +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +#if defined(MBEDTLS_SSL_CLI_C) +/** + * \brief Export a session in order to resume it later. + * + * \param ssl The SSL context representing the connection for which to + * to export a session structure for later resumption. + * \param session The target structure in which to store the exported session. + * This must have been initialized with mbedtls_ssl_init_session() + * but otherwise be unused. + * + * \note This function can handle a variety of mechanisms for session + * resumption: For TLS 1.2, both session ID-based resumption and + * ticket-based resumption will be considered. For TLS 1.3, + * once implemented, sessions equate to tickets, and calling + * this function multiple times will export the available + * tickets one a time until no further tickets are available, + * in which case MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE will + * be returned. + * + * \note Calling this function multiple times will only be useful + * once TLS 1.3 is supported. For TLS 1.2 connections, this + * function should be called at most once. + * + * \return \c 0 if successful. In this case, \p session can be used for + * session resumption by passing it to mbedtls_ssl_set_session(), + * and serialized for storage via mbedtls_ssl_session_save(). + * \return #MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE if no further session + * is available for export. + * This error is a non-fatal, and has no observable effect on + * the SSL context or the destination session. + * \return Another negative error code on other kinds of failure. + * + * \sa mbedtls_ssl_set_session() + * \sa mbedtls_ssl_session_save() + */ +int mbedtls_ssl_get_session(const mbedtls_ssl_context *ssl, + mbedtls_ssl_session *session); +#endif /* MBEDTLS_SSL_CLI_C */ + +/** + * \brief Perform the SSL handshake + * + * \param ssl SSL context + * + * \return \c 0 if successful. + * \return #MBEDTLS_ERR_SSL_WANT_READ or #MBEDTLS_ERR_SSL_WANT_WRITE + * if the handshake is incomplete and waiting for data to + * be available for reading from or writing to the underlying + * transport - in this case you must call this function again + * when the underlying transport is ready for the operation. + * \return #MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS if an asynchronous + * operation is in progress (see + * mbedtls_ssl_conf_async_private_cb()) - in this case you + * must call this function again when the operation is ready. + * \return #MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS if a cryptographic + * operation is in progress (see mbedtls_ecp_set_max_ops()) - + * in this case you must call this function again to complete + * the handshake when you're done attending other tasks. + * \return #MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED if DTLS is in use + * and the client did not demonstrate reachability yet - in + * this case you must stop using the context (see below). + * \return Another SSL error code - in this case you must stop using + * the context (see below). + * + * \warning If this function returns something other than + * \c 0, + * #MBEDTLS_ERR_SSL_WANT_READ, + * #MBEDTLS_ERR_SSL_WANT_WRITE, + * #MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS or + * #MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS, + * you must stop using the SSL context for reading or writing, + * and either free it or call \c mbedtls_ssl_session_reset() + * on it before re-using it for a new connection; the current + * connection must be closed. + * + * \note If DTLS is in use, then you may choose to handle + * #MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED specially for logging + * purposes, as it is an expected return value rather than an + * actual error, but you still need to reset/free the context. + * + * \note Remarks regarding event-driven DTLS: + * If the function returns #MBEDTLS_ERR_SSL_WANT_READ, no datagram + * from the underlying transport layer is currently being processed, + * and it is safe to idle until the timer or the underlying transport + * signal a new event. This is not true for a successful handshake, + * in which case the datagram of the underlying transport that is + * currently being processed might or might not contain further + * DTLS records. + * + * \note If the context is configured to allow TLS 1.3, or if + * #MBEDTLS_USE_PSA_CRYPTO is enabled, the PSA crypto + * subsystem must have been initialized by calling + * psa_crypto_init() before calling this function. + */ +int mbedtls_ssl_handshake(mbedtls_ssl_context *ssl); + +/** + * \brief After calling mbedtls_ssl_handshake() to start the SSL + * handshake you can call this function to check whether the + * handshake is over for a given SSL context. This function + * should be also used to determine when to stop calling + * mbedtls_handshake_step() for that context. + * + * \param ssl SSL context + * + * \return \c 1 if handshake is over, \c 0 if it is still ongoing. + */ +static inline int mbedtls_ssl_is_handshake_over(mbedtls_ssl_context *ssl) +{ + return ssl->MBEDTLS_PRIVATE(state) >= MBEDTLS_SSL_HANDSHAKE_OVER; +} + +/** + * \brief Perform a single step of the SSL handshake + * + * \note The state of the context (ssl->state) will be at + * the next state after this function returns \c 0. Do not + * call this function if mbedtls_ssl_is_handshake_over() + * returns \c 1. + * + * \warning Whilst in the past you may have used direct access to the + * context state (ssl->state) in order to ascertain when to + * stop calling this function and although you can still do + * so with something like ssl->MBEDTLS_PRIVATE(state) or by + * defining MBEDTLS_ALLOW_PRIVATE_ACCESS, this is now + * considered deprecated and could be broken in any future + * release. If you still find you have good reason for such + * direct access, then please do contact the team to explain + * this (raise an issue or post to the mailing list), so that + * we can add a solution to your problem that will be + * guaranteed to work in the future. + * + * \param ssl SSL context + * + * \return See mbedtls_ssl_handshake(). + * + * \warning If this function returns something other than \c 0, + * #MBEDTLS_ERR_SSL_WANT_READ, #MBEDTLS_ERR_SSL_WANT_WRITE, + * #MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS or + * #MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS, you must stop using + * the SSL context for reading or writing, and either free it + * or call \c mbedtls_ssl_session_reset() on it before + * re-using it for a new connection; the current connection + * must be closed. + */ +int mbedtls_ssl_handshake_step(mbedtls_ssl_context *ssl); + +#if defined(MBEDTLS_SSL_RENEGOTIATION) +/** + * \brief Initiate an SSL renegotiation on the running connection. + * Client: perform the renegotiation right now. + * Server: request renegotiation, which will be performed + * during the next call to mbedtls_ssl_read() if honored by + * client. + * + * \param ssl SSL context + * + * \return 0 if successful, or any mbedtls_ssl_handshake() return + * value except #MBEDTLS_ERR_SSL_CLIENT_RECONNECT that can't + * happen during a renegotiation. + * + * \warning If this function returns something other than \c 0, + * #MBEDTLS_ERR_SSL_WANT_READ, #MBEDTLS_ERR_SSL_WANT_WRITE, + * #MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS or + * #MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS, you must stop using + * the SSL context for reading or writing, and either free it + * or call \c mbedtls_ssl_session_reset() on it before + * re-using it for a new connection; the current connection + * must be closed. + * + */ +int mbedtls_ssl_renegotiate(mbedtls_ssl_context *ssl); +#endif /* MBEDTLS_SSL_RENEGOTIATION */ + +/** + * \brief Read at most 'len' application data bytes + * + * \param ssl SSL context + * \param buf buffer that will hold the data + * \param len maximum number of bytes to read + * + * \return The (positive) number of bytes read if successful. + * \return \c 0 if the read end of the underlying transport was closed + * without sending a CloseNotify beforehand, which might happen + * because of various reasons (internal error of an underlying + * stack, non-conformant peer not sending a CloseNotify and + * such) - in this case you must stop using the context + * (see below). + * \return #MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY if the underlying + * transport is still functional, but the peer has + * acknowledged to not send anything anymore. + * \return #MBEDTLS_ERR_SSL_WANT_READ or #MBEDTLS_ERR_SSL_WANT_WRITE + * if the handshake is incomplete and waiting for data to + * be available for reading from or writing to the underlying + * transport - in this case you must call this function again + * when the underlying transport is ready for the operation. + * \return #MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS if an asynchronous + * operation is in progress (see + * mbedtls_ssl_conf_async_private_cb()) - in this case you + * must call this function again when the operation is ready. + * \return #MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS if a cryptographic + * operation is in progress (see mbedtls_ecp_set_max_ops()) - + * in this case you must call this function again to complete + * the handshake when you're done attending other tasks. + * \return #MBEDTLS_ERR_SSL_CLIENT_RECONNECT if we're at the server + * side of a DTLS connection and the client is initiating a + * new connection using the same source port. See below. + * \return Another SSL error code - in this case you must stop using + * the context (see below). + * + * \warning If this function returns something other than + * a positive value, + * #MBEDTLS_ERR_SSL_WANT_READ, + * #MBEDTLS_ERR_SSL_WANT_WRITE, + * #MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS, + * #MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS or + * #MBEDTLS_ERR_SSL_CLIENT_RECONNECT, + * you must stop using the SSL context for reading or writing, + * and either free it or call \c mbedtls_ssl_session_reset() + * on it before re-using it for a new connection; the current + * connection must be closed. + * + * \note When this function returns #MBEDTLS_ERR_SSL_CLIENT_RECONNECT + * (which can only happen server-side), it means that a client + * is initiating a new connection using the same source port. + * You can either treat that as a connection close and wait + * for the client to resend a ClientHello, or directly + * continue with \c mbedtls_ssl_handshake() with the same + * context (as it has been reset internally). Either way, you + * must make sure this is seen by the application as a new + * connection: application state, if any, should be reset, and + * most importantly the identity of the client must be checked + * again. WARNING: not validating the identity of the client + * again, or not transmitting the new identity to the + * application layer, would allow authentication bypass! + * + * \note Remarks regarding event-driven DTLS: + * - If the function returns #MBEDTLS_ERR_SSL_WANT_READ, no datagram + * from the underlying transport layer is currently being processed, + * and it is safe to idle until the timer or the underlying transport + * signal a new event. + * - This function may return MBEDTLS_ERR_SSL_WANT_READ even if data was + * initially available on the underlying transport, as this data may have + * been only e.g. duplicated messages or a renegotiation request. + * Therefore, you must be prepared to receive MBEDTLS_ERR_SSL_WANT_READ even + * when reacting to an incoming-data event from the underlying transport. + * - On success, the datagram of the underlying transport that is currently + * being processed may contain further DTLS records. You should call + * \c mbedtls_ssl_check_pending to check for remaining records. + * + */ +int mbedtls_ssl_read(mbedtls_ssl_context *ssl, unsigned char *buf, size_t len); + +/** + * \brief Try to write exactly 'len' application data bytes + * + * \warning This function will do partial writes in some cases. If the + * return value is non-negative but less than length, the + * function must be called again with updated arguments: + * buf + ret, len - ret (if ret is the return value) until + * it returns a value equal to the last 'len' argument. + * + * \param ssl SSL context + * \param buf buffer holding the data + * \param len how many bytes must be written + * + * \return The (non-negative) number of bytes actually written if + * successful (may be less than \p len). + * \return #MBEDTLS_ERR_SSL_WANT_READ or #MBEDTLS_ERR_SSL_WANT_WRITE + * if the handshake is incomplete and waiting for data to + * be available for reading from or writing to the underlying + * transport - in this case you must call this function again + * when the underlying transport is ready for the operation. + * \return #MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS if an asynchronous + * operation is in progress (see + * mbedtls_ssl_conf_async_private_cb()) - in this case you + * must call this function again when the operation is ready. + * \return #MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS if a cryptographic + * operation is in progress (see mbedtls_ecp_set_max_ops()) - + * in this case you must call this function again to complete + * the handshake when you're done attending other tasks. + * \return Another SSL error code - in this case you must stop using + * the context (see below). + * + * \warning If this function returns something other than + * a non-negative value, + * #MBEDTLS_ERR_SSL_WANT_READ, + * #MBEDTLS_ERR_SSL_WANT_WRITE, + * #MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS or + * #MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS, + * you must stop using the SSL context for reading or writing, + * and either free it or call \c mbedtls_ssl_session_reset() + * on it before re-using it for a new connection; the current + * connection must be closed. + * + * \note When this function returns #MBEDTLS_ERR_SSL_WANT_WRITE/READ, + * it must be called later with the *same* arguments, + * until it returns a value greater than or equal to 0. When + * the function returns #MBEDTLS_ERR_SSL_WANT_WRITE there may be + * some partial data in the output buffer, however this is not + * yet sent. + * + * \note If the requested length is greater than the maximum + * fragment length (either the built-in limit or the one set + * or negotiated with the peer), then: + * - with TLS, less bytes than requested are written. + * - with DTLS, MBEDTLS_ERR_SSL_BAD_INPUT_DATA is returned. + * \c mbedtls_ssl_get_max_out_record_payload() may be used to + * query the active maximum fragment length. + * + * \note Attempting to write 0 bytes will result in an empty TLS + * application record being sent. + */ +int mbedtls_ssl_write(mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len); + +/** + * \brief Send an alert message + * + * \param ssl SSL context + * \param level The alert level of the message + * (MBEDTLS_SSL_ALERT_LEVEL_WARNING or MBEDTLS_SSL_ALERT_LEVEL_FATAL) + * \param message The alert message (SSL_ALERT_MSG_*) + * + * \return 0 if successful, or a specific SSL error code. + * + * \note If this function returns something other than 0 or + * MBEDTLS_ERR_SSL_WANT_READ/WRITE, you must stop using + * the SSL context for reading or writing, and either free it or + * call \c mbedtls_ssl_session_reset() on it before re-using it + * for a new connection; the current connection must be closed. + */ +int mbedtls_ssl_send_alert_message(mbedtls_ssl_context *ssl, + unsigned char level, + unsigned char message); +/** + * \brief Notify the peer that the connection is being closed + * + * \param ssl SSL context + * + * \return 0 if successful, or a specific SSL error code. + * + * \note If this function returns something other than 0 or + * MBEDTLS_ERR_SSL_WANT_READ/WRITE, you must stop using + * the SSL context for reading or writing, and either free it or + * call \c mbedtls_ssl_session_reset() on it before re-using it + * for a new connection; the current connection must be closed. + */ +int mbedtls_ssl_close_notify(mbedtls_ssl_context *ssl); + +#if defined(MBEDTLS_SSL_EARLY_DATA) + +#if defined(MBEDTLS_SSL_SRV_C) +/** + * \brief Read at most 'len' application data bytes while performing + * the handshake (early data). + * + * \note This function behaves mainly as mbedtls_ssl_read(). The + * specification of mbedtls_ssl_read() relevant to TLS 1.3 + * (thus not the parts specific to (D)TLS 1.2) applies to this + * function and the present documentation is restricted to the + * differences with mbedtls_ssl_read(). + * + * \param ssl SSL context + * \param buf buffer that will hold the data + * \param len maximum number of bytes to read + * + * \return One additional specific return value: + * #MBEDTLS_ERR_SSL_CANNOT_READ_EARLY_DATA. + * + * #MBEDTLS_ERR_SSL_CANNOT_READ_EARLY_DATA is returned when it + * is not possible to read early data for the SSL context + * \p ssl. + * + * It may have been possible and it is not possible + * anymore because the server received the End of Early Data + * message or the maximum number of allowed early data for the + * PSK in use has been reached. + * + * It may never have been possible and will never be possible + * for the SSL context \p ssl because the use of early data + * is disabled for that context or more generally the context + * is not suitably configured to enable early data or the + * client does not use early data or the first call to the + * function was done while the handshake was already too + * advanced to gather and accept early data. + * + * It is not possible to read early data for the SSL context + * \p ssl but this does not preclude for using it with + * mbedtls_ssl_write(), mbedtls_ssl_read() or + * mbedtls_ssl_handshake(). + * + * \note When a server wants to retrieve early data, it is expected + * that this function starts the handshake for the SSL context + * \p ssl. But this is not mandatory. + * + */ +int mbedtls_ssl_read_early_data(mbedtls_ssl_context *ssl, + unsigned char *buf, size_t len); +#endif /* MBEDTLS_SSL_SRV_C */ + +#if defined(MBEDTLS_SSL_CLI_C) +/** + * \brief Try to write exactly 'len' application data bytes while + * performing the handshake (early data). + * + * \note This function behaves mainly as mbedtls_ssl_write(). The + * specification of mbedtls_ssl_write() relevant to TLS 1.3 + * (thus not the parts specific to (D)TLS1.2) applies to this + * function and the present documentation is restricted to the + * differences with mbedtls_ssl_write(). + * + * \param ssl SSL context + * \param buf buffer holding the data + * \param len how many bytes must be written + * + * \return One additional specific return value: + * #MBEDTLS_ERR_SSL_CANNOT_WRITE_EARLY_DATA. + * + * #MBEDTLS_ERR_SSL_CANNOT_WRITE_EARLY_DATA is returned when it + * is not possible to write early data for the SSL context + * \p ssl. + * + * It may have been possible and it is not possible + * anymore because the client received the server Finished + * message, the server rejected early data or the maximum + * number of allowed early data for the PSK in use has been + * reached. + * + * It may never have been possible and will never be possible + * for the SSL context \p ssl because the use of early data + * is disabled for that context or more generally the context + * is not suitably configured to enable early data or the first + * call to the function was done while the handshake was + * already completed. + * + * It is not possible to write early data for the SSL context + * \p ssl but this does not preclude for using it with + * mbedtls_ssl_write(), mbedtls_ssl_read() or + * mbedtls_ssl_handshake(). + * + * \note This function may write early data only if the SSL context + * has been configured for the handshake with a PSK for which + * early data is allowed. + * + * \note To maximize the number of early data that can be written in + * the course of the handshake, it is expected that this + * function starts the handshake for the SSL context \p ssl. + * But this is not mandatory. + * + * \note This function does not provide any information on whether + * the server has accepted or will accept early data or not. + * When it returns a positive value, it just means that it + * has written early data to the server. To know whether the + * server has accepted early data or not, you should call + * mbedtls_ssl_get_early_data_status() with the handshake + * completed. + */ +int mbedtls_ssl_write_early_data(mbedtls_ssl_context *ssl, + const unsigned char *buf, size_t len); + +#define MBEDTLS_SSL_EARLY_DATA_STATUS_NOT_SENT 0 +#define MBEDTLS_SSL_EARLY_DATA_STATUS_ACCEPTED 1 +#define MBEDTLS_SSL_EARLY_DATA_STATUS_REJECTED 2 +/** + * \brief Get the status of the negotiation of the use of early data. + * + * \param ssl The SSL context to query + * + * \return #MBEDTLS_ERR_SSL_BAD_INPUT_DATA if this function is called + * from the server-side. + * + * \return #MBEDTLS_ERR_SSL_BAD_INPUT_DATA if this function is called + * prior to completion of the handshake. + * + * \return #MBEDTLS_SSL_EARLY_DATA_STATUS_NOT_SENT if the client has + * not indicated the use of early data to the server. + * + * \return #MBEDTLS_SSL_EARLY_DATA_STATUS_ACCEPTED if the client has + * indicated the use of early data and the server has accepted + * it. + * + * \return #MBEDTLS_SSL_EARLY_DATA_STATUS_REJECTED if the client has + * indicated the use of early data but the server has rejected + * it. In this situation, the client may want to re-send the + * early data it may have tried to send by calling + * mbedtls_ssl_write_early_data() as ordinary post-handshake + * application data by calling mbedtls_ssl_write(). + * + */ +int mbedtls_ssl_get_early_data_status(mbedtls_ssl_context *ssl); +#endif /* MBEDTLS_SSL_CLI_C */ + +#endif /* MBEDTLS_SSL_EARLY_DATA */ + +/** + * \brief Free referenced items in an SSL context and clear memory + * + * \param ssl SSL context + */ +void mbedtls_ssl_free(mbedtls_ssl_context *ssl); + +#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION) +/** + * \brief Save an active connection as serialized data in a buffer. + * This allows the freeing or re-using of the SSL context + * while still picking up the connection later in a way that + * it entirely transparent to the peer. + * + * \see mbedtls_ssl_context_load() + * + * \note The serialized data only contains the data that is + * necessary to resume the connection: negotiated protocol + * options, session identifier, keys, etc. + * Loading a saved SSL context does not restore settings and + * state related to how the application accesses the context, + * such as configured callback functions, user data, pending + * incoming or outgoing data, etc. + * + * \note This feature is currently only available under certain + * conditions, see the documentation of the return value + * #MBEDTLS_ERR_SSL_BAD_INPUT_DATA for details. + * + * \note When this function succeeds, it calls + * mbedtls_ssl_session_reset() on \p ssl which as a result is + * no longer associated with the connection that has been + * serialized. This avoids creating copies of the connection + * state. You're then free to either re-use the context + * structure for a different connection, or call + * mbedtls_ssl_free() on it. See the documentation of + * mbedtls_ssl_session_reset() for more details. + * + * \param ssl The SSL context to save. On success, it is no longer + * associated with the connection that has been serialized. + * \param buf The buffer to write the serialized data to. It must be a + * writeable buffer of at least \p buf_len bytes, or may be \c + * NULL if \p buf_len is \c 0. + * \param buf_len The number of bytes available for writing in \p buf. + * \param olen The size in bytes of the data that has been or would have + * been written. It must point to a valid \c size_t. + * + * \note \p olen is updated to the correct value regardless of + * whether \p buf_len was large enough. This makes it possible + * to determine the necessary size by calling this function + * with \p buf set to \c NULL and \p buf_len to \c 0. However, + * the value of \p olen is only guaranteed to be correct when + * the function returns #MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL or + * \c 0. If the return value is different, then the value of + * \p olen is undefined. + * + * \return \c 0 if successful. + * \return #MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL if \p buf is too small. + * \return #MBEDTLS_ERR_SSL_ALLOC_FAILED if memory allocation failed + * while resetting the context. + * \return #MBEDTLS_ERR_SSL_BAD_INPUT_DATA if a handshake is in + * progress, or there is pending data for reading or sending, + * or the connection does not use DTLS 1.2 with an AEAD + * ciphersuite, or renegotiation is enabled. + */ +int mbedtls_ssl_context_save(mbedtls_ssl_context *ssl, + unsigned char *buf, + size_t buf_len, + size_t *olen); + +/** + * \brief Load serialized connection data to an SSL context. + * + * \see mbedtls_ssl_context_save() + * + * \warning The same serialized data must never be loaded into more + * that one context. In order to ensure that, after + * successfully loading serialized data to an SSL context, you + * should immediately destroy or invalidate all copies of the + * serialized data that was loaded. Loading the same data in + * more than one context would cause severe security failures + * including but not limited to loss of confidentiality. + * + * \note Before calling this function, the SSL context must be + * prepared in one of the two following ways. The first way is + * to take a context freshly initialised with + * mbedtls_ssl_init() and call mbedtls_ssl_setup() on it with + * the same ::mbedtls_ssl_config structure that was used in + * the original connection. The second way is to + * call mbedtls_ssl_session_reset() on a context that was + * previously prepared as above but used in the meantime. + * Either way, you must not use the context to perform a + * handshake between calling mbedtls_ssl_setup() or + * mbedtls_ssl_session_reset() and calling this function. You + * may however call other setter functions in that time frame + * as indicated in the note below. + * + * \note Before or after calling this function successfully, you + * also need to configure some connection-specific callbacks + * and settings before you can use the connection again + * (unless they were already set before calling + * mbedtls_ssl_session_reset() and the values are suitable for + * the present connection). Specifically, you want to call + * at least mbedtls_ssl_set_bio(), + * mbedtls_ssl_set_timer_cb(), and + * mbedtls_ssl_set_user_data_n() or + * mbedtls_ssl_set_user_data_p() if they were set originally. + * All other SSL setter functions + * are not necessary to call, either because they're only used + * in handshakes, or because the setting is already saved. You + * might choose to call them anyway, for example in order to + * share code between the cases of establishing a new + * connection and the case of loading an already-established + * connection. + * + * \note If you have new information about the path MTU, you want to + * call mbedtls_ssl_set_mtu() after calling this function, as + * otherwise this function would overwrite your + * newly-configured value with the value that was active when + * the context was saved. + * + * \note When this function returns an error code, it calls + * mbedtls_ssl_free() on \p ssl. In this case, you need to + * prepare the context with the usual sequence starting with a + * call to mbedtls_ssl_init() if you want to use it again. + * + * \param ssl The SSL context structure to be populated. It must have + * been prepared as described in the note above. + * \param buf The buffer holding the serialized connection data. It must + * be a readable buffer of at least \p len bytes. + * \param len The size of the serialized data in bytes. + * + * \return \c 0 if successful. + * \return #MBEDTLS_ERR_SSL_ALLOC_FAILED if memory allocation failed. + * \return #MBEDTLS_ERR_SSL_VERSION_MISMATCH if the serialized data + * comes from a different Mbed TLS version or build. + * \return #MBEDTLS_ERR_SSL_BAD_INPUT_DATA if input data is invalid. + */ +int mbedtls_ssl_context_load(mbedtls_ssl_context *ssl, + const unsigned char *buf, + size_t len); +#endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */ + +/** + * \brief Initialize an SSL configuration context + * Just makes the context ready for + * mbedtls_ssl_config_defaults() or mbedtls_ssl_config_free(). + * + * \note You need to call mbedtls_ssl_config_defaults() unless you + * manually set all of the relevant fields yourself. + * + * \param conf SSL configuration context + */ +void mbedtls_ssl_config_init(mbedtls_ssl_config *conf); + +/** + * \brief Load reasonable default SSL configuration values. + * (You need to call mbedtls_ssl_config_init() first.) + * + * \param conf SSL configuration context + * \param endpoint MBEDTLS_SSL_IS_CLIENT or MBEDTLS_SSL_IS_SERVER + * \param transport MBEDTLS_SSL_TRANSPORT_STREAM for TLS, or + * MBEDTLS_SSL_TRANSPORT_DATAGRAM for DTLS + * \param preset a MBEDTLS_SSL_PRESET_XXX value + * + * \note See \c mbedtls_ssl_conf_transport() for notes on DTLS. + * + * \return 0 if successful, or + * MBEDTLS_ERR_XXX_ALLOC_FAILED on memory allocation error. + */ +int mbedtls_ssl_config_defaults(mbedtls_ssl_config *conf, + int endpoint, int transport, int preset); + +/** + * \brief Free an SSL configuration context + * + * \param conf SSL configuration context + */ +void mbedtls_ssl_config_free(mbedtls_ssl_config *conf); + +/** + * \brief Initialize SSL session structure + * + * \param session SSL session + */ +void mbedtls_ssl_session_init(mbedtls_ssl_session *session); + +/** + * \brief Free referenced items in an SSL session including the + * peer certificate and clear memory + * + * \note A session object can be freed even if the SSL context + * that was used to retrieve the session is still in use. + * + * \param session SSL session + */ +void mbedtls_ssl_session_free(mbedtls_ssl_session *session); + +/** + * \brief TLS-PRF function for key derivation. + * + * \param prf The tls_prf type function type to be used. + * \param secret Secret for the key derivation function. + * \param slen Length of the secret. + * \param label String label for the key derivation function, + * terminated with null character. + * \param random Random bytes. + * \param rlen Length of the random bytes buffer. + * \param dstbuf The buffer holding the derived key. + * \param dlen Length of the output buffer. + * + * \return 0 on success. An SSL specific error on failure. + */ +int mbedtls_ssl_tls_prf(const mbedtls_tls_prf_types prf, + const unsigned char *secret, size_t slen, + const char *label, + const unsigned char *random, size_t rlen, + unsigned char *dstbuf, size_t dlen); + +#ifdef __cplusplus +} +#endif + +#endif /* ssl.h */ |