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 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 const QuicTag k1CON = TAG('1', 'C', 'O', 'N');   // Emulate a single connection
  59 const QuicTag kNTLP = TAG('N', 'T', 'L', 'P');   // No tail loss probe
  60 const QuicTag kNCON = TAG('N', 'C', 'O', 'N');   // N Connection Congestion Ctrl
  61 const QuicTag kNRTO = TAG('N', 'R', 'T', 'O');   // CWND reduction on loss
  62
  63 // Loss detection algorithm types
  64 const QuicTag kNACK = TAG('N', 'A', 'C', 'K');   // TCP style nack counting
  65 const QuicTag kTIME = TAG('T', 'I', 'M', 'E');   // Time based
  66
  67 // Optional support of truncated Connection IDs.  If sent by a peer, the value
  68 // is the minimum number of bytes allowed for the connection ID sent to the
  69 // peer.
  70 const QuicTag kTCID = TAG('T', 'C', 'I', 'D');   // Connection ID truncation.
  71
  72 // FEC options
  73 const QuicTag kFHDR = TAG('F', 'H', 'D', 'R');   // FEC protect headers
  74
  75 // Enable bandwidth resumption experiment.
  76 const QuicTag kBWRE = TAG('B', 'W', 'R', 'E');  // Bandwidth resumption.
  77
  78 // Proof types (i.e. certificate types)
  79 // NOTE: although it would be silly to do so, specifying both kX509 and kX59R
  80 // is allowed and is equivalent to specifying only kX509.
  81 const QuicTag kX509 = TAG('X', '5', '0', '9');   // X.509 certificate, all key
  82                                                  // types
  83 const QuicTag kX59R = TAG('X', '5', '9', 'R');   // X.509 certificate, RSA keys
  84                                                  // only
  85 const QuicTag kCHID = TAG('C', 'H', 'I', 'D');   // Channel ID.
  86
  87 // Client hello tags
  88 const QuicTag kVER  = TAG('V', 'E', 'R', '\0');  // Version (new)
  89 const QuicTag kNONC = TAG('N', 'O', 'N', 'C');   // The client's nonce
  90 const QuicTag kKEXS = TAG('K', 'E', 'X', 'S');   // Key exchange methods
  91 const QuicTag kAEAD = TAG('A', 'E', 'A', 'D');   // Authenticated
  92                                                  // encryption algorithms
  93 const QuicTag kCGST = TAG('C', 'G', 'S', 'T');   // Congestion control
  94                                                  // feedback types
  95 const QuicTag kCOPT = TAG('C', 'O', 'P', 'T');   // Connection options
  96 const QuicTag kICSL = TAG('I', 'C', 'S', 'L');   // Idle connection state
  97                                                  // lifetime
  98 const QuicTag kSCLS = TAG('S', 'C', 'L', 'S');   // Silently close on timeout
  99 const QuicTag kMSPC = TAG('M', 'S', 'P', 'C');   // Max streams per connection.
 100 const QuicTag kIRTT = TAG('I', 'R', 'T', 'T');   // Estimated initial RTT in us.
 101 const QuicTag kSWND = TAG('S', 'W', 'N', 'D');   // Server's Initial congestion
 102                                                  // window.
 103 const QuicTag kSNI  = TAG('S', 'N', 'I', '\0');  // Server name
 104                                                  // indication
 105 const QuicTag kPUBS = TAG('P', 'U', 'B', 'S');   // Public key values
 106 const QuicTag kSCID = TAG('S', 'C', 'I', 'D');   // Server config id
 107 const QuicTag kORBT = TAG('O', 'B', 'I', 'T');   // Server orbit.
 108 const QuicTag kPDMD = TAG('P', 'D', 'M', 'D');   // Proof demand.
 109 const QuicTag kPROF = TAG('P', 'R', 'O', 'F');   // Proof (signature).
 110 const QuicTag kCCS  = TAG('C', 'C', 'S', 0);     // Common certificate set
 111 const QuicTag kCCRT = TAG('C', 'C', 'R', 'T');   // Cached certificate
 112 const QuicTag kEXPY = TAG('E', 'X', 'P', 'Y');   // Expiry
 113 const QuicTag kSFCW = TAG('S', 'F', 'C', 'W');   // Initial stream flow control
 114                                                  // receive window.
 115 const QuicTag kCFCW = TAG('C', 'F', 'C', 'W');   // Initial session/connection
 116                                                  // flow control receive window.
 117 const QuicTag kUAID = TAG('U', 'A', 'I', 'D');   // Client's User Agent ID.
 118
 119 // Rejection tags
 120 const QuicTag kRREJ = TAG('R', 'R', 'E', 'J');   // Reasons for server sending
 121                                                  // rejection message tag.
 122
 123 // Server hello tags
 124 const QuicTag kCADR = TAG('C', 'A', 'D', 'R');   // Client IP address and port
 125
 126 // CETV tags
 127 const QuicTag kCIDK = TAG('C', 'I', 'D', 'K');   // ChannelID key
 128 const QuicTag kCIDS = TAG('C', 'I', 'D', 'S');   // ChannelID signature
 129
 130 // Public reset tags
 131 const QuicTag kRNON = TAG('R', 'N', 'O', 'N');   // Public reset nonce proof
 132 const QuicTag kRSEQ = TAG('R', 'S', 'E', 'Q');   // Rejected sequence number
 133
 134 // Universal tags
 135 const QuicTag kPAD  = TAG('P', 'A', 'D', '\0');  // Padding
 136
 137 // These tags have a special form so that they appear either at the beginning
 138 // or the end of a handshake message. Since handshake messages are sorted by
 139 // tag value, the tags with 0 at the end will sort first and those with 255 at
 140 // the end will sort last.
 141 //
 142 // The certificate chain should have a tag that will cause it to be sorted at
 143 // the end of any handshake messages because it's likely to be large and the
 144 // client might be able to get everything that it needs from the small values at
 145 // the beginning.
 146 //
 147 // Likewise tags with random values should be towards the beginning of the
 148 // message because the server mightn't hold state for a rejected client hello
 149 // and therefore the client may have issues reassembling the rejection message
 150 // in the event that it sent two client hellos.
 151 const QuicTag kServerNonceTag =
 152     TAG('S', 'N', 'O', 0);  // The server's nonce
 153 const QuicTag kSourceAddressTokenTag =
 154     TAG('S', 'T', 'K', 0);  // Source-address token
 155 const QuicTag kCertificateTag =
 156     TAG('C', 'R', 'T', 255);  // Certificate chain
 157
 158 #undef TAG
 159
 160 const size_t kMaxEntries = 128;  // Max number of entries in a message.
 161
 162 const size_t kNonceSize = 32;  // Size in bytes of the connection nonce.
 163
 164 const size_t kOrbitSize = 8;  // Number of bytes in an orbit value.
 165
 166 // kProofSignatureLabel is prepended to server configs before signing to avoid
 167 // any cross-protocol attacks on the signature.
 168 const char kProofSignatureLabel[] = "QUIC server config signature";
 169
 170 // kClientHelloMinimumSize is the minimum size of a client hello. Client hellos
 171 // will have PAD tags added in order to ensure this minimum is met and client
 172 // hellos smaller than this will be an error. This minimum size reduces the
 173 // amplification factor of any mirror DoS attack.
 174 //
 175 // A client may pad an inchoate client hello to a size larger than
 176 // kClientHelloMinimumSize to make it more likely to receive a complete
 177 // rejection message.
 178 const size_t kClientHelloMinimumSize = 1024;
 179
 180 }  // namespace net
 181
 182 #endif  // NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_