net/quic/crypto/crypto_protocol.h

   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
  37 // Key exchange methods
  38 const QuicTag kP256 = TAG('P', '2', '5', '6');   // ECDH, Curve P-256
  39 const QuicTag kC255 = TAG('C', '2', '5', '5');   // ECDH, Curve25519
  40
  41 // AEAD algorithms
  42 const QuicTag kNULL = TAG('N', 'U', 'L', 'N');   // null algorithm
  43 const QuicTag kAESG = TAG('A', 'E', 'S', 'G');   // AES128 + GCM-12
  44 const QuicTag kCC12 = TAG('C', 'C', '1', '2');   // ChaCha20 + Poly1305
  45
  46 // Congestion control feedback types
  47 const QuicTag kQBIC = TAG('Q', 'B', 'I', 'C');   // TCP cubic
  48 const QuicTag kPACE = TAG('P', 'A', 'C', 'E');   // Paced TCP cubic
  49 const QuicTag kINAR = TAG('I', 'N', 'A', 'R');   // Inter arrival
  50
  51 // Congestion control options
  52 const QuicTag kTBBR = TAG('T', 'B', 'B', 'R');   // Reduced Buffer Bloat TCP
  53
  54 // Loss detection algorithm types
  55 const QuicTag kNACK = TAG('N', 'A', 'C', 'K');   // TCP style nack counting
  56 const QuicTag kTIME = TAG('T', 'I', 'M', 'E');   // Time based
  57
  58 // FEC options
  59 const QuicTag kFHDR = TAG('F', 'H', 'D', 'R');   // FEC protect headers
  60
  61 // Proof types (i.e. certificate types)
  62 // NOTE: although it would be silly to do so, specifying both kX509 and kX59R
  63 // is allowed and is equivalent to specifying only kX509.
  64 const QuicTag kX509 = TAG('X', '5', '0', '9');   // X.509 certificate, all key
  65                                                  // types
  66 const QuicTag kX59R = TAG('X', '5', '9', 'R');   // X.509 certificate, RSA keys
  67                                                  // only
  68 const QuicTag kCHID = TAG('C', 'H', 'I', 'D');   // Channel ID.
  69
  70 // Client hello tags
  71 const QuicTag kVER  = TAG('V', 'E', 'R', '\0');  // Version (new)
  72 const QuicTag kNONC = TAG('N', 'O', 'N', 'C');   // The client's nonce
  73 const QuicTag kKEXS = TAG('K', 'E', 'X', 'S');   // Key exchange methods
  74 const QuicTag kAEAD = TAG('A', 'E', 'A', 'D');   // Authenticated
  75                                                  // encryption algorithms
  76 const QuicTag kCGST = TAG('C', 'G', 'S', 'T');   // Congestion control
  77                                                  // feedback types
  78 const QuicTag kCOPT = TAG('C', 'O', 'P', 'T');   // Congestion control options
  79 // kLOSS was 'L', 'O', 'S', 'S', but was changed from a tag vector to a tag.
  80 const QuicTag kLOSS = TAG('L', 'O', 'S', 'A');   // Loss detection algorithms
  81 const QuicTag kICSL = TAG('I', 'C', 'S', 'L');   // Idle connection state
  82                                                  // lifetime
  83 const QuicTag kKATO = TAG('K', 'A', 'T', 'O');   // Keepalive timeout
  84 const QuicTag kMSPC = TAG('M', 'S', 'P', 'C');   // Max streams per connection.
  85 const QuicTag kIRTT = TAG('I', 'R', 'T', 'T');   // Estimated initial RTT in us.
  86 const QuicTag kSWND = TAG('S', 'W', 'N', 'D');   // Server's Initial congestion
  87                                                  // window.
  88 const QuicTag kSNI  = TAG('S', 'N', 'I', '\0');  // Server name
  89                                                  // indication
  90 const QuicTag kPUBS = TAG('P', 'U', 'B', 'S');   // Public key values
  91 const QuicTag kSCID = TAG('S', 'C', 'I', 'D');   // Server config id
  92 const QuicTag kORBT = TAG('O', 'B', 'I', 'T');   // Server orbit.
  93 const QuicTag kPDMD = TAG('P', 'D', 'M', 'D');   // Proof demand.
  94 const QuicTag kPROF = TAG('P', 'R', 'O', 'F');   // Proof (signature).
  95 const QuicTag kCCS  = TAG('C', 'C', 'S', 0);     // Common certificate set
  96 const QuicTag kCCRT = TAG('C', 'C', 'R', 'T');   // Cached certificate
  97 const QuicTag kEXPY = TAG('E', 'X', 'P', 'Y');   // Expiry
  98 // TODO(rjshade): Remove kIFCW when removing QUIC_VERSION_19.
  99 const QuicTag kIFCW = TAG('I', 'F', 'C', 'W');   // Initial flow control receive
 100                                                  // window.
 101 const QuicTag kSFCW = TAG('S', 'F', 'C', 'W');   // Initial stream flow control
 102                                                  // receive window.
 103 const QuicTag kCFCW = TAG('C', 'F', 'C', 'W');   // Initial session/connection
 104                                                  // flow control receive window.
 105 const QuicTag kUAID = TAG('U', 'A', 'I', 'D');   // Client's User Agent ID.
 106
 107 // Rejection tags
 108 const QuicTag kRREJ = TAG('R', 'R', 'E', 'J');   // Reasons for server sending
 109                                                  // rejection message tag.
 110
 111 // Server hello tags
 112 const QuicTag kCADR = TAG('C', 'A', 'D', 'R');   // Client IP address and port
 113
 114 // CETV tags
 115 const QuicTag kCIDK = TAG('C', 'I', 'D', 'K');   // ChannelID key
 116 const QuicTag kCIDS = TAG('C', 'I', 'D', 'S');   // ChannelID signature
 117
 118 // Public reset tags
 119 const QuicTag kRNON = TAG('R', 'N', 'O', 'N');   // Public reset nonce proof
 120 const QuicTag kRSEQ = TAG('R', 'S', 'E', 'Q');   // Rejected sequence number
 121
 122 // Universal tags
 123 const QuicTag kPAD  = TAG('P', 'A', 'D', '\0');  // Padding
 124
 125 // These tags have a special form so that they appear either at the beginning
 126 // or the end of a handshake message. Since handshake messages are sorted by
 127 // tag value, the tags with 0 at the end will sort first and those with 255 at
 128 // the end will sort last.
 129 //
 130 // The certificate chain should have a tag that will cause it to be sorted at
 131 // the end of any handshake messages because it's likely to be large and the
 132 // client might be able to get everything that it needs from the small values at
 133 // the beginning.
 134 //
 135 // Likewise tags with random values should be towards the beginning of the
 136 // message because the server mightn't hold state for a rejected client hello
 137 // and therefore the client may have issues reassembling the rejection message
 138 // in the event that it sent two client hellos.
 139 const QuicTag kServerNonceTag =
 140     TAG('S', 'N', 'O', 0);  // The server's nonce
 141 const QuicTag kSourceAddressTokenTag =
 142     TAG('S', 'T', 'K', 0);  // Source-address token
 143 const QuicTag kCertificateTag =
 144     TAG('C', 'R', 'T', 255);  // Certificate chain
 145
 146 #undef TAG
 147
 148 const size_t kMaxEntries = 128;  // Max number of entries in a message.
 149
 150 const size_t kNonceSize = 32;  // Size in bytes of the connection nonce.
 151
 152 const size_t kOrbitSize = 8;  // Number of bytes in an orbit value.
 153
 154 // kProofSignatureLabel is prepended to server configs before signing to avoid
 155 // any cross-protocol attacks on the signature.
 156 const char kProofSignatureLabel[] = "QUIC server config signature";
 157
 158 // kClientHelloMinimumSize is the minimum size of a client hello. Client hellos
 159 // will have PAD tags added in order to ensure this minimum is met and client
 160 // hellos smaller than this will be an error. This minimum size reduces the
 161 // amplification factor of any mirror DoS attack.
 162 //
 163 // A client may pad an inchoate client hello to a size larger than
 164 // kClientHelloMinimumSize to make it more likely to receive a complete
 165 // rejection message.
 166 const size_t kClientHelloMinimumSize = 1024;
 167
 168 }  // namespace net
 169
 170 #endif  // NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_