1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_ 6 #define NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_ 7 8 #include <string> 9 10 #include "net/base/net_export.h" 11 #include "net/quic/quic_protocol.h" 12 13 // Version and Crypto tags are written to the wire with a big-endian 14 // representation of the name of the tag. For example 15 // the client hello tag (CHLO) will be written as the 16 // following 4 bytes: 'C' 'H' 'L' 'O'. Since it is 17 // stored in memory as a little endian uint32, we need 18 // to reverse the order of the bytes. 19 // 20 // We use a macro to ensure that no static initialisers are created. Use the 21 // MakeQuicTag function in normal code. 22 #define TAG(a, b, c, d) \ 23 static_cast<QuicTag>((d << 24) + (c << 16) + (b << 8) + a) 24 25 namespace net { 26 27 typedef std::string ServerConfigID; 28 29 const QuicTag kCHLO = TAG('C', 'H', 'L', 'O'); // Client hello 30 const QuicTag kSHLO = TAG('S', 'H', 'L', 'O'); // Server hello 31 const QuicTag kSCFG = TAG('S', 'C', 'F', 'G'); // Server config 32 const QuicTag kREJ = TAG('R', 'E', 'J', '\0'); // Reject 33 const QuicTag kCETV = TAG('C', 'E', 'T', 'V'); // Client encrypted tag-value 34 // pairs 35 const QuicTag kPRST = TAG('P', 'R', 'S', 'T'); // Public reset 36 const QuicTag kSCUP = TAG('S', 'C', 'U', 'P'); // Server config update. 37 38 // Key exchange methods 39 const QuicTag kP256 = TAG('P', '2', '5', '6'); // ECDH, Curve P-256 40 const QuicTag kC255 = TAG('C', '2', '5', '5'); // ECDH, Curve25519 41 42 // AEAD algorithms 43 const QuicTag kNULL = TAG('N', 'U', 'L', 'N'); // null algorithm 44 const QuicTag kAESG = TAG('A', 'E', 'S', 'G'); // AES128 + GCM-12 45 const QuicTag kCC12 = TAG('C', 'C', '1', '2'); // ChaCha20 + Poly1305 46 47 // Socket receive buffer 48 const QuicTag kSRBF = TAG('S', 'R', 'B', 'F'); // Socket receive buffer 49 50 // Congestion control feedback types 51 const QuicTag kQBIC = TAG('Q', 'B', 'I', 'C'); // TCP cubic 52 53 // Connection options (COPT) values 54 const QuicTag kTBBR = TAG('T', 'B', 'B', 'R'); // Reduced Buffer Bloat TCP 55 const QuicTag kRENO = TAG('R', 'E', 'N', 'O'); // Reno Congestion Control 56 const QuicTag kIW10 = TAG('I', 'W', '1', '0'); // Force ICWND to 10 57 const QuicTag kPACE = TAG('P', 'A', 'C', 'E'); // Paced TCP cubic 58 59 // Loss detection algorithm types 60 const QuicTag kNACK = TAG('N', 'A', 'C', 'K'); // TCP style nack counting 61 const QuicTag kTIME = TAG('T', 'I', 'M', 'E'); // Time based 62 63 // FEC options 64 const QuicTag kFHDR = TAG('F', 'H', 'D', 'R'); // FEC protect headers 65 66 // Proof types (i.e. certificate types) 67 // NOTE: although it would be silly to do so, specifying both kX509 and kX59R 68 // is allowed and is equivalent to specifying only kX509. 69 const QuicTag kX509 = TAG('X', '5', '0', '9'); // X.509 certificate, all key 70 // types 71 const QuicTag kX59R = TAG('X', '5', '9', 'R'); // X.509 certificate, RSA keys 72 // only 73 const QuicTag kCHID = TAG('C', 'H', 'I', 'D'); // Channel ID. 74 75 // Client hello tags 76 const QuicTag kVER = TAG('V', 'E', 'R', '\0'); // Version (new) 77 const QuicTag kNONC = TAG('N', 'O', 'N', 'C'); // The client's nonce 78 const QuicTag kKEXS = TAG('K', 'E', 'X', 'S'); // Key exchange methods 79 const QuicTag kAEAD = TAG('A', 'E', 'A', 'D'); // Authenticated 80 // encryption algorithms 81 const QuicTag kCGST = TAG('C', 'G', 'S', 'T'); // Congestion control 82 // feedback types 83 const QuicTag kCOPT = TAG('C', 'O', 'P', 'T'); // Connection options 84 // kLOSS was 'L', 'O', 'S', 'S', but was changed from a tag vector to a tag. 85 const QuicTag kLOSS = TAG('L', 'O', 'S', 'A'); // Loss detection algorithms 86 const QuicTag kICSL = TAG('I', 'C', 'S', 'L'); // Idle connection state 87 // lifetime 88 const QuicTag kKATO = TAG('K', 'A', 'T', 'O'); // Keepalive timeout 89 const QuicTag kMSPC = TAG('M', 'S', 'P', 'C'); // Max streams per connection. 90 const QuicTag kIRTT = TAG('I', 'R', 'T', 'T'); // Estimated initial RTT in us. 91 const QuicTag kSWND = TAG('S', 'W', 'N', 'D'); // Server's Initial congestion 92 // window. 93 const QuicTag kSNI = TAG('S', 'N', 'I', '\0'); // Server name 94 // indication 95 const QuicTag kPUBS = TAG('P', 'U', 'B', 'S'); // Public key values 96 const QuicTag kSCID = TAG('S', 'C', 'I', 'D'); // Server config id 97 const QuicTag kORBT = TAG('O', 'B', 'I', 'T'); // Server orbit. 98 const QuicTag kPDMD = TAG('P', 'D', 'M', 'D'); // Proof demand. 99 const QuicTag kPROF = TAG('P', 'R', 'O', 'F'); // Proof (signature). 100 const QuicTag kCCS = TAG('C', 'C', 'S', 0); // Common certificate set 101 const QuicTag kCCRT = TAG('C', 'C', 'R', 'T'); // Cached certificate 102 const QuicTag kEXPY = TAG('E', 'X', 'P', 'Y'); // Expiry 103 // TODO(rjshade): Remove kIFCW when removing QUIC_VERSION_19. 104 const QuicTag kIFCW = TAG('I', 'F', 'C', 'W'); // Initial flow control receive 105 // window. 106 const QuicTag kSFCW = TAG('S', 'F', 'C', 'W'); // Initial stream flow control 107 // receive window. 108 const QuicTag kCFCW = TAG('C', 'F', 'C', 'W'); // Initial session/connection 109 // flow control receive window. 110 const QuicTag kUAID = TAG('U', 'A', 'I', 'D'); // Client's User Agent ID. 111 112 // Rejection tags 113 const QuicTag kRREJ = TAG('R', 'R', 'E', 'J'); // Reasons for server sending 114 // rejection message tag. 115 116 // Server hello tags 117 const QuicTag kCADR = TAG('C', 'A', 'D', 'R'); // Client IP address and port 118 119 // CETV tags 120 const QuicTag kCIDK = TAG('C', 'I', 'D', 'K'); // ChannelID key 121 const QuicTag kCIDS = TAG('C', 'I', 'D', 'S'); // ChannelID signature 122 123 // Public reset tags 124 const QuicTag kRNON = TAG('R', 'N', 'O', 'N'); // Public reset nonce proof 125 const QuicTag kRSEQ = TAG('R', 'S', 'E', 'Q'); // Rejected sequence number 126 127 // Universal tags 128 const QuicTag kPAD = TAG('P', 'A', 'D', '\0'); // Padding 129 130 // These tags have a special form so that they appear either at the beginning 131 // or the end of a handshake message. Since handshake messages are sorted by 132 // tag value, the tags with 0 at the end will sort first and those with 255 at 133 // the end will sort last. 134 // 135 // The certificate chain should have a tag that will cause it to be sorted at 136 // the end of any handshake messages because it's likely to be large and the 137 // client might be able to get everything that it needs from the small values at 138 // the beginning. 139 // 140 // Likewise tags with random values should be towards the beginning of the 141 // message because the server mightn't hold state for a rejected client hello 142 // and therefore the client may have issues reassembling the rejection message 143 // in the event that it sent two client hellos. 144 const QuicTag kServerNonceTag = 145 TAG('S', 'N', 'O', 0); // The server's nonce 146 const QuicTag kSourceAddressTokenTag = 147 TAG('S', 'T', 'K', 0); // Source-address token 148 const QuicTag kCertificateTag = 149 TAG('C', 'R', 'T', 255); // Certificate chain 150 151 #undef TAG 152 153 const size_t kMaxEntries = 128; // Max number of entries in a message. 154 155 const size_t kNonceSize = 32; // Size in bytes of the connection nonce. 156 157 const size_t kOrbitSize = 8; // Number of bytes in an orbit value. 158 159 // kProofSignatureLabel is prepended to server configs before signing to avoid 160 // any cross-protocol attacks on the signature. 161 const char kProofSignatureLabel[] = "QUIC server config signature"; 162 163 // kClientHelloMinimumSize is the minimum size of a client hello. Client hellos 164 // will have PAD tags added in order to ensure this minimum is met and client 165 // hellos smaller than this will be an error. This minimum size reduces the 166 // amplification factor of any mirror DoS attack. 167 // 168 // A client may pad an inchoate client hello to a size larger than 169 // kClientHelloMinimumSize to make it more likely to receive a complete 170 // rejection message. 171 const size_t kClientHelloMinimumSize = 1024; 172 173 } // namespace net 174 175 #endif // NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_ 176