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) ((d << 24) + (c << 16) + (b << 8) + a) 23 24 namespace net { 25 26 typedef std::string ServerConfigID; 27 28 const QuicTag kCHLO = TAG('C', 'H', 'L', 'O'); // Client hello 29 const QuicTag kSHLO = TAG('S', 'H', 'L', 'O'); // Server hello 30 const QuicTag kSCFG = TAG('S', 'C', 'F', 'G'); // Server config 31 const QuicTag kREJ = TAG('R', 'E', 'J', '\0'); // Reject 32 const QuicTag kCETV = TAG('C', 'E', 'T', 'V'); // Client encrypted tag-value 33 // pairs 34 const QuicTag kPRST = TAG('P', 'R', 'S', 'T'); // Public reset 35 36 // Key exchange methods 37 const QuicTag kP256 = TAG('P', '2', '5', '6'); // ECDH, Curve P-256 38 const QuicTag kC255 = TAG('C', '2', '5', '5'); // ECDH, Curve25519 39 40 // AEAD algorithms 41 const QuicTag kNULL = TAG('N', 'U', 'L', 'N'); // null algorithm 42 const QuicTag kAESG = TAG('A', 'E', 'S', 'G'); // AES128 + GCM-12 43 const QuicTag kCC12 = TAG('C', 'C', '1', '2'); // ChaCha20 + Poly1305 44 45 // Congestion control feedback types 46 const QuicTag kQBIC = TAG('Q', 'B', 'I', 'C'); // TCP cubic 47 const QuicTag kPACE = TAG('P', 'A', 'C', 'E'); // Paced TCP cubic 48 const QuicTag kINAR = TAG('I', 'N', 'A', 'R'); // Inter arrival 49 50 // Congestion control options 51 const QuicTag kTBBR = TAG('T', 'B', 'B', 'R'); // Reduced Buffer Bloat TCP 52 53 // Loss detection algorithm types 54 const QuicTag kNACK = TAG('N', 'A', 'C', 'K'); // TCP style nack counting 55 const QuicTag kTIME = TAG('T', 'I', 'M', 'E'); // Time based 56 57 // Proof types (i.e. certificate types) 58 // NOTE: although it would be silly to do so, specifying both kX509 and kX59R 59 // is allowed and is equivalent to specifying only kX509. 60 const QuicTag kX509 = TAG('X', '5', '0', '9'); // X.509 certificate, all key 61 // types 62 const QuicTag kX59R = TAG('X', '5', '9', 'R'); // X.509 certificate, RSA keys 63 // only 64 const QuicTag kCHID = TAG('C', 'H', 'I', 'D'); // Channel ID. 65 66 // Client hello tags 67 const QuicTag kVER = TAG('V', 'E', 'R', '\0'); // Version (new) 68 const QuicTag kNONC = TAG('N', 'O', 'N', 'C'); // The client's nonce 69 const QuicTag kKEXS = TAG('K', 'E', 'X', 'S'); // Key exchange methods 70 const QuicTag kAEAD = TAG('A', 'E', 'A', 'D'); // Authenticated 71 // encryption algorithms 72 const QuicTag kCGST = TAG('C', 'G', 'S', 'T'); // Congestion control 73 // feedback types 74 const QuicTag kCOPT = TAG('C', 'O', 'P', 'T'); // Congestion control options 75 // kLOSS was 'L', 'O', 'S', 'S', but was changed from a tag vector to a tag. 76 const QuicTag kLOSS = TAG('L', 'O', 'S', 'A'); // Loss detection algorithms 77 const QuicTag kICSL = TAG('I', 'C', 'S', 'L'); // Idle connection state 78 // lifetime 79 const QuicTag kKATO = TAG('K', 'A', 'T', 'O'); // Keepalive timeout 80 const QuicTag kMSPC = TAG('M', 'S', 'P', 'C'); // Max streams per connection. 81 const QuicTag kIRTT = TAG('I', 'R', 'T', 'T'); // Estimated initial RTT in us. 82 const QuicTag kSWND = TAG('S', 'W', 'N', 'D'); // Server's Initial congestion 83 // window. 84 const QuicTag kSNI = TAG('S', 'N', 'I', '\0'); // Server name 85 // indication 86 const QuicTag kPUBS = TAG('P', 'U', 'B', 'S'); // Public key values 87 const QuicTag kSCID = TAG('S', 'C', 'I', 'D'); // Server config id 88 const QuicTag kORBT = TAG('O', 'B', 'I', 'T'); // Server orbit. 89 const QuicTag kPDMD = TAG('P', 'D', 'M', 'D'); // Proof demand. 90 const QuicTag kPROF = TAG('P', 'R', 'O', 'F'); // Proof (signature). 91 const QuicTag kCCS = TAG('C', 'C', 'S', 0); // Common certificate set 92 const QuicTag kCCRT = TAG('C', 'C', 'R', 'T'); // Cached certificate 93 const QuicTag kEXPY = TAG('E', 'X', 'P', 'Y'); // Expiry 94 // TODO(rjshade): Remove kIFCW when removing QUIC_VERSION_19. 95 const QuicTag kIFCW = TAG('I', 'F', 'C', 'W'); // Initial flow control receive 96 // window. 97 const QuicTag kSFCW = TAG('S', 'F', 'C', 'W'); // Initial stream flow control 98 // receive window. 99 const QuicTag kCFCW = TAG('C', 'F', 'C', 'W'); // Initial session/connection 100 // flow control receive window. 101 const QuicTag kUAID = TAG('U', 'A', 'I', 'D'); // Client's User Agent ID. 102 103 // Server hello tags 104 const QuicTag kCADR = TAG('C', 'A', 'D', 'R'); // Client IP address and port 105 106 // CETV tags 107 const QuicTag kCIDK = TAG('C', 'I', 'D', 'K'); // ChannelID key 108 const QuicTag kCIDS = TAG('C', 'I', 'D', 'S'); // ChannelID signature 109 110 // Public reset tags 111 const QuicTag kRNON = TAG('R', 'N', 'O', 'N'); // Public reset nonce proof 112 const QuicTag kRSEQ = TAG('R', 'S', 'E', 'Q'); // Rejected sequence number 113 114 // Universal tags 115 const QuicTag kPAD = TAG('P', 'A', 'D', '\0'); // Padding 116 117 // Reasons for server sending rejection message tag. 118 const QuicTag kRREJ = TAG('R', 'R', 'E', 'J'); 119 120 // These tags have a special form so that they appear either at the beginning 121 // or the end of a handshake message. Since handshake messages are sorted by 122 // tag value, the tags with 0 at the end will sort first and those with 255 at 123 // the end will sort last. 124 // 125 // The certificate chain should have a tag that will cause it to be sorted at 126 // the end of any handshake messages because it's likely to be large and the 127 // client might be able to get everything that it needs from the small values at 128 // the beginning. 129 // 130 // Likewise tags with random values should be towards the beginning of the 131 // message because the server mightn't hold state for a rejected client hello 132 // and therefore the client may have issues reassembling the rejection message 133 // in the event that it sent two client hellos. 134 const QuicTag kServerNonceTag = 135 TAG('S', 'N', 'O', 0); // The server's nonce 136 const QuicTag kSourceAddressTokenTag = 137 TAG('S', 'T', 'K', 0); // Source-address token 138 const QuicTag kCertificateTag = 139 TAG('C', 'R', 'T', 255); // Certificate chain 140 141 #undef TAG 142 143 const size_t kMaxEntries = 128; // Max number of entries in a message. 144 145 const size_t kNonceSize = 32; // Size in bytes of the connection nonce. 146 147 const size_t kOrbitSize = 8; // Number of bytes in an orbit value. 148 149 // kProofSignatureLabel is prepended to server configs before signing to avoid 150 // any cross-protocol attacks on the signature. 151 const char kProofSignatureLabel[] = "QUIC server config signature"; 152 153 // kClientHelloMinimumSize is the minimum size of a client hello. Client hellos 154 // will have PAD tags added in order to ensure this minimum is met and client 155 // hellos smaller than this will be an error. This minimum size reduces the 156 // amplification factor of any mirror DoS attack. 157 // 158 // A client may pad an inchoate client hello to a size larger than 159 // kClientHelloMinimumSize to make it more likely to receive a complete 160 // rejection message. 161 const size_t kClientHelloMinimumSize = 1024; 162 163 } // namespace net 164 165 #endif // NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_ 166