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/*
* Copyright (c) 2022 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.Accounts
* File: MFAConfig.cs
*
* MFAConfig.cs is part of VNLib.Plugins.Essentials.Accounts which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Essentials.Accounts is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Essentials.Accounts is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System;
using System.Linq;
using System.Text.Json;
using System.Collections.Generic;
using VNLib.Hashing;
using VNLib.Utils.Extensions;
using VNLib.Hashing.IdentityUtility;
namespace VNLib.Plugins.Essentials.Accounts.MFA
{
internal class MFAConfig
{
public ReadOnlyJsonWebKey? MFASecret { get; set; }
public bool TOTPEnabled { get; }
public string? IssuerName { get; }
public TimeSpan TOTPPeriod { get; }
public HashAlg TOTPAlg { get; }
public int TOTPDigits { get; }
public int TOTPSecretBytes { get; }
public int TOTPTimeWindowSteps { get; }
public bool FIDOEnabled { get; }
public int FIDOChallangeSize { get; }
public int FIDOTimeout { get; }
public string? FIDOSiteName { get; }
public string? FIDOAttestationType { get; }
public FidoAuthenticatorSelection? FIDOAuthSelection { get; }
public TimeSpan UpgradeValidFor { get; }
public int NonceLenBytes { get; }
public MFAConfig(IReadOnlyDictionary<string, JsonElement> conf)
{
UpgradeValidFor = conf["upgrade_expires_secs"].GetTimeSpan(TimeParseType.Seconds);
NonceLenBytes = conf["nonce_size"].GetInt32();
string siteName = conf["site_name"].GetString() ?? throw new KeyNotFoundException("Missing required key 'site_name' in 'mfa' config");
//Totp setup
if (conf.TryGetValue("totp", out JsonElement totpEl))
{
IReadOnlyDictionary<string, JsonElement> totp = totpEl.EnumerateObject().ToDictionary(k => k.Name, k => k.Value);
//Get totp config
IssuerName = siteName;
//Get alg name
string TOTPAlgName = totp["algorithm"].GetString()?.ToUpper() ?? throw new KeyNotFoundException("Missing required key 'algorithm' in plugin 'mfa' config");
//Parse from enum string
TOTPAlg = Enum.Parse<HashAlg>(TOTPAlgName);
TOTPDigits = totp["digits"].GetInt32();
TOTPPeriod = TimeSpan.FromSeconds(totp["period_secs"].GetInt32());
TOTPSecretBytes = totp["secret_size"].GetInt32();
TOTPTimeWindowSteps = totp["window_size"].GetInt32();
//Set enabled flag
TOTPEnabled = true;
}
//Fido setup
if(conf.TryGetValue("fido", out JsonElement fidoEl))
{
IReadOnlyDictionary<string, JsonElement> fido = fidoEl.EnumerateObject().ToDictionary(k => k.Name, k => k.Value);
FIDOChallangeSize = fido["challenge_size"].GetInt32();
FIDOAttestationType = fido["attestation"].GetString();
FIDOTimeout = fido["timeout"].GetInt32();
FIDOSiteName = siteName;
//Deserailze a
if(fido.TryGetValue("authenticatorSelection", out JsonElement authSel))
{
FIDOAuthSelection = authSel.Deserialize<FidoAuthenticatorSelection>();
}
//Set enabled flag
FIDOEnabled = true;
}
}
}
}
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