Line data    Source code

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