Line data    Source code

       1             : /*
       2             :  *  Copyright (C) 2004-2024 Savoir-faire Linux Inc.
       3             :  *
       4             :  *  Author: Pierre-Luc Bacon <pierre-luc.bacon@savoirfairelinux.com>
       5             :  *  Author: Alexandre Savard <alexandre.savard@savoirfairelinux.com>
       6             :  *  Author: Adrien Béraud <adrien.beraud@savoirfairelinux.com>
       7             :  *
       8             :  *  This program is free software; you can redistribute it and/or modify
       9             :  *  it under the terms of the GNU General Public License as published by
      10             :  *  the Free Software Foundation; either version 3 of the License, or
      11             :  *  (at your option) any later version.
      12             :  *
      13             :  *  This program is distributed in the hope that it will be useful,
      14             :  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      16             :  *  GNU General Public License for more details.
      17             :  *
      18             :  *  You should have received a copy of the GNU General Public License
      19             :  *  along with this program; if not, write to the Free Software
      20             :  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
      21             :  */
      22             : #pragma once
      23             : 
      24             : #include "media/media_codec.h"
      25             : 
      26             : #include <stdexcept>
      27             : #include <string>
      28             : #include <vector>
      29             : 
      30             : using namespace std::literals;
      31             : 
      32             : namespace jami {
      33             : 
      34             : /**
      35             :  * General exception object that is thrown when
      36             :  * an error occurred with a regular expression
      37             :  * operation.
      38             :  */
      39             : class ParseError : public std::invalid_argument
      40             : {
      41             : public:
      42           0 :     explicit ParseError(const std::string& error)
      43           0 :         : std::invalid_argument(error)
      44           0 :     {}
      45             : };
      46             : 
      47             : enum CipherMode { AESCounterMode, AESF8Mode };
      48             : 
      49             : enum MACMode { HMACSHA1 };
      50             : 
      51             : enum KeyMethod {
      52             :     Inline
      53             :     // url, maybe at some point
      54             : };
      55             : 
      56             : struct CryptoSuiteDefinition
      57             : {
      58             :     std::string_view name;
      59             :     int masterKeyLength;
      60             :     int masterSaltLength;
      61             :     int srtpLifetime;
      62             :     int srtcpLifetime;
      63             :     CipherMode cipher;
      64             :     int encryptionKeyLength;
      65             :     MACMode mac;
      66             :     int srtpAuthTagLength;
      67             :     int srtcpAuthTagLength;
      68             :     int srtpAuthKeyLength;
      69             :     int srtcpAuthKeyLen;
      70             : };
      71             : 
      72             : /**
      73             :  * List of accepted Crypto-Suites
      74             :  * as defined in RFC4568 (6.2)
      75             :  */
      76             : 
      77             : static std::vector<CryptoSuiteDefinition> CryptoSuites = {
      78             :     {"AES_CM_128_HMAC_SHA1_80"sv, 128, 112, 48, 31, AESCounterMode, 128, HMACSHA1, 80, 80, 160, 160},
      79             : 
      80             :     {"AES_CM_128_HMAC_SHA1_32"sv, 128, 112, 48, 31, AESCounterMode, 128, HMACSHA1, 32, 80, 160, 160},
      81             : 
      82             :     {"F8_128_HMAC_SHA1_80"sv, 128, 112, 48, 31, AESF8Mode, 128, HMACSHA1, 80, 80, 160, 160}};
      83             : 
      84             : class SdesNegotiator
      85             : {
      86             : public:
      87             :     SdesNegotiator();
      88             : 
      89             :     static CryptoAttribute negotiate(const std::vector<std::string>& attributes);
      90             : 
      91             :     inline explicit operator bool() const { return not CryptoSuites.empty(); }
      92             : 
      93             : private:
      94             :     static std::vector<CryptoAttribute> parse(const std::vector<std::string>& attributes);
      95             : };
      96             : 
      97             : } // namespace jami