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) ((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 // Proof types (i.e. certificate types)
  51 // NOTE: although it would be silly to do so, specifying both kX509 and kX59R
  52 // is allowed and is equivalent to specifying only kX509.
  53 const QuicTag kX509 = TAG('X', '5', '0', '9');  // X.509 certificate, all key
  54                                                 // types
  55 const QuicTag kX59R = TAG('X', '5', '9', 'R');  // X.509 certificate, RSA keys
  56                                                 // only
  57 const QuicTag kCHID = TAG('C', 'H', 'I', 'D');  // Channel ID.
  58
  59 // Client hello tags
  60 const QuicTag kVER  = TAG('V', 'E', 'R', '\0'); // Version (new)
  61 const QuicTag kNONC = TAG('N', 'O', 'N', 'C');  // The client's nonce
  62 const QuicTag kKEXS = TAG('K', 'E', 'X', 'S');  // Key exchange methods
  63 const QuicTag kAEAD = TAG('A', 'E', 'A', 'D');  // Authenticated
  64                                                 // encryption algorithms
  65 const QuicTag kCGST = TAG('C', 'G', 'S', 'T');  // Congestion control
  66                                                 // feedback types
  67 const QuicTag kICSL = TAG('I', 'C', 'S', 'L');  // Idle connection state
  68                                                 // lifetime
  69 const QuicTag kKATO = TAG('K', 'A', 'T', 'O');  // Keepalive timeout
  70 const QuicTag kMSPC = TAG('M', 'S', 'P', 'C');  // Max streams per connection.
  71 const QuicTag kIRTT = TAG('I', 'R', 'T', 'T');  // Estimated initial RTT in us.
  72 const QuicTag kSWND = TAG('S', 'W', 'N', 'D');  // Server's Initial congestion
  73                                                 // window.
  74 const QuicTag kSNI  = TAG('S', 'N', 'I', '\0'); // Server name
  75                                                 // indication
  76 const QuicTag kPUBS = TAG('P', 'U', 'B', 'S');  // Public key values
  77 const QuicTag kSCID = TAG('S', 'C', 'I', 'D');  // Server config id
  78 const QuicTag kORBT = TAG('O', 'B', 'I', 'T');  // Server orbit.
  79 const QuicTag kPDMD = TAG('P', 'D', 'M', 'D');  // Proof demand.
  80 const QuicTag kPROF = TAG('P', 'R', 'O', 'F');  // Proof (signature).
  81 const QuicTag kCCS  = TAG('C', 'C', 'S', 0);    // Common certificate set
  82 const QuicTag kCCRT = TAG('C', 'C', 'R', 'T');  // Cached certificate
  83 const QuicTag kEXPY = TAG('E', 'X', 'P', 'Y');  // Expiry
  84 const QuicTag kIFCW = TAG('I', 'F', 'C', 'W');  // Initial flow control receive
  85                                                 // window.
  86
  87 // Server hello tags
  88 const QuicTag kCADR = TAG('C', 'A', 'D', 'R');  // Client IP address and port
  89
  90 // CETV tags
  91 const QuicTag kCIDK = TAG('C', 'I', 'D', 'K');  // ChannelID key
  92 const QuicTag kCIDS = TAG('C', 'I', 'D', 'S');  // ChannelID signature
  93
  94 // Public reset tags
  95 const QuicTag kRNON = TAG('R', 'N', 'O', 'N');  // Public reset nonce proof
  96 const QuicTag kRSEQ = TAG('R', 'S', 'E', 'Q');  // Rejected sequence number
  97
  98 // Universal tags
  99 const QuicTag kPAD  = TAG('P', 'A', 'D', '\0'); // Padding
 100
 101 // These tags have a special form so that they appear either at the beginning
 102 // or the end of a handshake message. Since handshake messages are sorted by
 103 // tag value, the tags with 0 at the end will sort first and those with 255 at
 104 // the end will sort last.
 105 //
 106 // The certificate chain should have a tag that will cause it to be sorted at
 107 // the end of any handshake messages because it's likely to be large and the
 108 // client might be able to get everything that it needs from the small values at
 109 // the beginning.
 110 //
 111 // Likewise tags with random values should be towards the beginning of the
 112 // message because the server mightn't hold state for a rejected client hello
 113 // and therefore the client may have issues reassembling the rejection message
 114 // in the event that it sent two client hellos.
 115 const QuicTag kServerNonceTag =
 116     TAG('S', 'N', 'O', 0);  // The server's nonce
 117 const QuicTag kSourceAddressTokenTag =
 118     TAG('S', 'T', 'K', 0);  // Source-address token
 119 const QuicTag kCertificateTag =
 120     TAG('C', 'R', 'T', 255);  // Certificate chain
 121
 122 #undef TAG
 123
 124 const size_t kMaxEntries = 128;  // Max number of entries in a message.
 125
 126 const size_t kNonceSize = 32;  // Size in bytes of the connection nonce.
 127
 128 const size_t kOrbitSize = 8;  // Number of bytes in an orbit value.
 129
 130 // kProofSignatureLabel is prepended to server configs before signing to avoid
 131 // any cross-protocol attacks on the signature.
 132 const char kProofSignatureLabel[] = "QUIC server config signature";
 133
 134 // kClientHelloMinimumSize is the minimum size of a client hello. Client hellos
 135 // will have PAD tags added in order to ensure this minimum is met and client
 136 // hellos smaller than this will be an error. This minimum size reduces the
 137 // amplification factor of any mirror DoS attack.
 138 //
 139 // A client may pad an inchoate client hello to a size larger than
 140 // kClientHelloMinimumSize to make it more likely to receive a complete
 141 // rejection message.
 142 const size_t kClientHelloMinimumSize = 1024;
 143
 144 }  // namespace net
 145
 146 #endif  // NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_