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| 1 // Copyright (c) 2013 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 #include "net/quic/crypto/cert_compressor.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "base/memory/scoped_ptr.h" | |
| 9 #include "net/quic/quic_utils.h" | |
| 10 #include "third_party/zlib/zlib.h" | |
| 11 | |
| 12 using base::StringPiece; | |
| 13 using std::string; | |
| 14 using std::vector; | |
| 15 | |
| 16 namespace net { | |
| 17 | |
| 18 namespace { | |
| 19 | |
| 20 // kCommonCertSubstrings contains ~1500 bytes of common certificate substrings | |
| 21 // in order to help zlib. This was generated via a fairly dumb algorithm from | |
| 22 // the Alexa Top 5000 set - we could probably do better. | |
| 23 static const unsigned char kCommonCertSubstrings[] = { | |
| 24 0x04, 0x02, 0x30, 0x00, 0x30, 0x1d, 0x06, 0x03, 0x55, 0x1d, 0x25, 0x04, | |
| 25 0x16, 0x30, 0x14, 0x06, 0x08, 0x2b, 0x06, 0x01, 0x05, 0x05, 0x07, 0x03, | |
| 26 0x01, 0x06, 0x08, 0x2b, 0x06, 0x01, 0x05, 0x05, 0x07, 0x03, 0x02, 0x30, | |
| 27 0x5f, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x86, 0xf8, 0x42, 0x04, 0x01, | |
| 28 0x06, 0x06, 0x0b, 0x60, 0x86, 0x48, 0x01, 0x86, 0xfd, 0x6d, 0x01, 0x07, | |
| 29 0x17, 0x01, 0x30, 0x33, 0x20, 0x45, 0x78, 0x74, 0x65, 0x6e, 0x64, 0x65, | |
| 30 0x64, 0x20, 0x56, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74, 0x69, 0x6f, 0x6e, | |
| 31 0x20, 0x53, 0x20, 0x4c, 0x69, 0x6d, 0x69, 0x74, 0x65, 0x64, 0x31, 0x34, | |
| 32 0x20, 0x53, 0x53, 0x4c, 0x20, 0x43, 0x41, 0x30, 0x1e, 0x17, 0x0d, 0x31, | |
| 33 0x32, 0x20, 0x53, 0x65, 0x63, 0x75, 0x72, 0x65, 0x20, 0x53, 0x65, 0x72, | |
| 34 0x76, 0x65, 0x72, 0x20, 0x43, 0x41, 0x30, 0x2d, 0x61, 0x69, 0x61, 0x2e, | |
| 35 0x76, 0x65, 0x72, 0x69, 0x73, 0x69, 0x67, 0x6e, 0x2e, 0x63, 0x6f, 0x6d, | |
| 36 0x2f, 0x45, 0x2d, 0x63, 0x72, 0x6c, 0x2e, 0x76, 0x65, 0x72, 0x69, 0x73, | |
| 37 0x69, 0x67, 0x6e, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x45, 0x2e, 0x63, 0x65, | |
| 38 0x72, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, | |
| 39 0x01, 0x05, 0x05, 0x00, 0x03, 0x82, 0x01, 0x01, 0x00, 0x4a, 0x2e, 0x63, | |
| 40 0x6f, 0x6d, 0x2f, 0x72, 0x65, 0x73, 0x6f, 0x75, 0x72, 0x63, 0x65, 0x73, | |
| 41 0x2f, 0x63, 0x70, 0x73, 0x20, 0x28, 0x63, 0x29, 0x30, 0x30, 0x09, 0x06, | |
| 42 0x03, 0x55, 0x1d, 0x13, 0x04, 0x02, 0x30, 0x00, 0x30, 0x1d, 0x30, 0x0d, | |
| 43 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x05, 0x05, | |
| 44 0x00, 0x03, 0x82, 0x01, 0x01, 0x00, 0x7b, 0x30, 0x1d, 0x06, 0x03, 0x55, | |
| 45 0x1d, 0x0e, 0x30, 0x82, 0x01, 0x22, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, | |
| 46 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x01, | |
| 47 0x0f, 0x00, 0x30, 0x82, 0x01, 0x0a, 0x02, 0x82, 0x01, 0x01, 0x00, 0xd2, | |
| 48 0x6f, 0x64, 0x6f, 0x63, 0x61, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x43, 0x2e, | |
| 49 0x63, 0x72, 0x6c, 0x30, 0x1d, 0x06, 0x03, 0x55, 0x1d, 0x0e, 0x04, 0x16, | |
| 50 0x04, 0x14, 0xb4, 0x2e, 0x67, 0x6c, 0x6f, 0x62, 0x61, 0x6c, 0x73, 0x69, | |
| 51 0x67, 0x6e, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x72, 0x30, 0x0b, 0x06, 0x03, | |
| 52 0x55, 0x1d, 0x0f, 0x04, 0x04, 0x03, 0x02, 0x01, 0x30, 0x0d, 0x06, 0x09, | |
| 53 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x05, 0x05, 0x00, 0x30, | |
| 54 0x81, 0xca, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06, 0x13, | |
| 55 0x02, 0x55, 0x53, 0x31, 0x10, 0x30, 0x0e, 0x06, 0x03, 0x55, 0x04, 0x08, | |
| 56 0x13, 0x07, 0x41, 0x72, 0x69, 0x7a, 0x6f, 0x6e, 0x61, 0x31, 0x13, 0x30, | |
| 57 0x11, 0x06, 0x03, 0x55, 0x04, 0x07, 0x13, 0x0a, 0x53, 0x63, 0x6f, 0x74, | |
| 58 0x74, 0x73, 0x64, 0x61, 0x6c, 0x65, 0x31, 0x1a, 0x30, 0x18, 0x06, 0x03, | |
| 59 0x55, 0x04, 0x0a, 0x13, 0x11, 0x47, 0x6f, 0x44, 0x61, 0x64, 0x64, 0x79, | |
| 60 0x2e, 0x63, 0x6f, 0x6d, 0x2c, 0x20, 0x49, 0x6e, 0x63, 0x2e, 0x31, 0x33, | |
| 61 0x30, 0x31, 0x06, 0x03, 0x55, 0x04, 0x0b, 0x13, 0x2a, 0x68, 0x74, 0x74, | |
| 62 0x70, 0x3a, 0x2f, 0x2f, 0x63, 0x65, 0x72, 0x74, 0x69, 0x66, 0x69, 0x63, | |
| 63 0x61, 0x74, 0x65, 0x73, 0x2e, 0x67, 0x6f, 0x64, 0x61, 0x64, 0x64, 0x79, | |
| 64 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x72, 0x65, 0x70, 0x6f, 0x73, 0x69, 0x74, | |
| 65 0x6f, 0x72, 0x79, 0x31, 0x30, 0x30, 0x2e, 0x06, 0x03, 0x55, 0x04, 0x03, | |
| 66 0x13, 0x27, 0x47, 0x6f, 0x20, 0x44, 0x61, 0x64, 0x64, 0x79, 0x20, 0x53, | |
| 67 0x65, 0x63, 0x75, 0x72, 0x65, 0x20, 0x43, 0x65, 0x72, 0x74, 0x69, 0x66, | |
| 68 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x41, 0x75, 0x74, 0x68, | |
| 69 0x6f, 0x72, 0x69, 0x74, 0x79, 0x31, 0x11, 0x30, 0x0f, 0x06, 0x03, 0x55, | |
| 70 0x04, 0x05, 0x13, 0x08, 0x30, 0x37, 0x39, 0x36, 0x39, 0x32, 0x38, 0x37, | |
| 71 0x30, 0x1e, 0x17, 0x0d, 0x31, 0x31, 0x30, 0x0e, 0x06, 0x03, 0x55, 0x1d, | |
| 72 0x0f, 0x01, 0x01, 0xff, 0x04, 0x04, 0x03, 0x02, 0x05, 0xa0, 0x30, 0x0c, | |
| 73 0x06, 0x03, 0x55, 0x1d, 0x13, 0x01, 0x01, 0xff, 0x04, 0x02, 0x30, 0x00, | |
| 74 0x30, 0x1d, 0x30, 0x0f, 0x06, 0x03, 0x55, 0x1d, 0x13, 0x01, 0x01, 0xff, | |
| 75 0x04, 0x05, 0x30, 0x03, 0x01, 0x01, 0x00, 0x30, 0x1d, 0x06, 0x03, 0x55, | |
| 76 0x1d, 0x25, 0x04, 0x16, 0x30, 0x14, 0x06, 0x08, 0x2b, 0x06, 0x01, 0x05, | |
| 77 0x05, 0x07, 0x03, 0x01, 0x06, 0x08, 0x2b, 0x06, 0x01, 0x05, 0x05, 0x07, | |
| 78 0x03, 0x02, 0x30, 0x0e, 0x06, 0x03, 0x55, 0x1d, 0x0f, 0x01, 0x01, 0xff, | |
| 79 0x04, 0x04, 0x03, 0x02, 0x05, 0xa0, 0x30, 0x33, 0x06, 0x03, 0x55, 0x1d, | |
| 80 0x1f, 0x04, 0x2c, 0x30, 0x2a, 0x30, 0x28, 0xa0, 0x26, 0xa0, 0x24, 0x86, | |
| 81 0x22, 0x68, 0x74, 0x74, 0x70, 0x3a, 0x2f, 0x2f, 0x63, 0x72, 0x6c, 0x2e, | |
| 82 0x67, 0x6f, 0x64, 0x61, 0x64, 0x64, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, | |
| 83 0x67, 0x64, 0x73, 0x31, 0x2d, 0x32, 0x30, 0x2a, 0x30, 0x28, 0x06, 0x08, | |
| 84 0x2b, 0x06, 0x01, 0x05, 0x05, 0x07, 0x02, 0x01, 0x16, 0x1c, 0x68, 0x74, | |
| 85 0x74, 0x70, 0x73, 0x3a, 0x2f, 0x2f, 0x77, 0x77, 0x77, 0x2e, 0x76, 0x65, | |
| 86 0x72, 0x69, 0x73, 0x69, 0x67, 0x6e, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, | |
| 87 0x70, 0x73, 0x30, 0x34, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x5a, 0x17, | |
| 88 0x0d, 0x31, 0x33, 0x30, 0x35, 0x30, 0x39, 0x06, 0x08, 0x2b, 0x06, 0x01, | |
| 89 0x05, 0x05, 0x07, 0x30, 0x02, 0x86, 0x2d, 0x68, 0x74, 0x74, 0x70, 0x3a, | |
| 90 0x2f, 0x2f, 0x73, 0x30, 0x39, 0x30, 0x37, 0x06, 0x08, 0x2b, 0x06, 0x01, | |
| 91 0x05, 0x05, 0x07, 0x02, 0x30, 0x44, 0x06, 0x03, 0x55, 0x1d, 0x20, 0x04, | |
| 92 0x3d, 0x30, 0x3b, 0x30, 0x39, 0x06, 0x0b, 0x60, 0x86, 0x48, 0x01, 0x86, | |
| 93 0xf8, 0x45, 0x01, 0x07, 0x17, 0x06, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, | |
| 94 0x55, 0x04, 0x06, 0x13, 0x02, 0x47, 0x42, 0x31, 0x1b, 0x53, 0x31, 0x17, | |
| 95 0x30, 0x15, 0x06, 0x03, 0x55, 0x04, 0x0a, 0x13, 0x0e, 0x56, 0x65, 0x72, | |
| 96 0x69, 0x53, 0x69, 0x67, 0x6e, 0x2c, 0x20, 0x49, 0x6e, 0x63, 0x2e, 0x31, | |
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| 113 0x1f, 0x06, 0x03, 0x55, 0x04, 0x0b, 0x13, 0x18, 0x44, 0x6f, 0x6d, 0x61, | |
| 114 0x69, 0x6e, 0x20, 0x43, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x20, 0x56, | |
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| 116 0x30, 0x2f, 0x06, 0x03, 0x55, 0x04, 0x0b, 0x13, 0x28, 0x53, 0x65, 0x65, | |
| 117 0x20, 0x77, 0x77, 0x77, 0x2e, 0x72, 0x3a, 0x2f, 0x2f, 0x73, 0x65, 0x63, | |
| 118 0x75, 0x72, 0x65, 0x2e, 0x67, 0x47, 0x6c, 0x6f, 0x62, 0x61, 0x6c, 0x53, | |
| 119 0x69, 0x67, 0x6e, 0x31, 0x53, 0x65, 0x72, 0x76, 0x65, 0x72, 0x43, 0x41, | |
| 120 0x2e, 0x63, 0x72, 0x6c, 0x56, 0x65, 0x72, 0x69, 0x53, 0x69, 0x67, 0x6e, | |
| 121 0x20, 0x43, 0x6c, 0x61, 0x73, 0x73, 0x20, 0x33, 0x20, 0x45, 0x63, 0x72, | |
| 122 0x6c, 0x2e, 0x67, 0x65, 0x6f, 0x74, 0x72, 0x75, 0x73, 0x74, 0x2e, 0x63, | |
| 123 0x6f, 0x6d, 0x2f, 0x63, 0x72, 0x6c, 0x73, 0x2f, 0x73, 0x64, 0x31, 0x1a, | |
| 124 0x30, 0x18, 0x06, 0x03, 0x55, 0x04, 0x0a, 0x68, 0x74, 0x74, 0x70, 0x3a, | |
| 125 0x2f, 0x2f, 0x45, 0x56, 0x49, 0x6e, 0x74, 0x6c, 0x2d, 0x63, 0x63, 0x72, | |
| 126 0x74, 0x2e, 0x67, 0x77, 0x77, 0x77, 0x2e, 0x67, 0x69, 0x63, 0x65, 0x72, | |
| 127 0x74, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x31, 0x6f, 0x63, 0x73, 0x70, 0x2e, | |
| 128 0x76, 0x65, 0x72, 0x69, 0x73, 0x69, 0x67, 0x6e, 0x2e, 0x63, 0x6f, 0x6d, | |
| 129 0x30, 0x39, 0x72, 0x61, 0x70, 0x69, 0x64, 0x73, 0x73, 0x6c, 0x2e, 0x63, | |
| 130 0x6f, 0x73, 0x2e, 0x67, 0x6f, 0x64, 0x61, 0x64, 0x64, 0x79, 0x2e, 0x63, | |
| 131 0x6f, 0x6d, 0x2f, 0x72, 0x65, 0x70, 0x6f, 0x73, 0x69, 0x74, 0x6f, 0x72, | |
| 132 0x79, 0x2f, 0x30, 0x81, 0x80, 0x06, 0x08, 0x2b, 0x06, 0x01, 0x05, 0x05, | |
| 133 0x07, 0x01, 0x01, 0x04, 0x74, 0x30, 0x72, 0x30, 0x24, 0x06, 0x08, 0x2b, | |
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| 135 0x70, 0x3a, 0x2f, 0x2f, 0x6f, 0x63, 0x73, 0x70, 0x2e, 0x67, 0x6f, 0x64, | |
| 136 0x61, 0x64, 0x64, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x30, 0x4a, 0x06, | |
| 137 0x08, 0x2b, 0x06, 0x01, 0x05, 0x05, 0x07, 0x30, 0x02, 0x86, 0x3e, 0x68, | |
| 138 0x74, 0x74, 0x70, 0x3a, 0x2f, 0x2f, 0x63, 0x65, 0x72, 0x74, 0x69, 0x66, | |
| 139 0x69, 0x63, 0x61, 0x74, 0x65, 0x73, 0x2e, 0x67, 0x6f, 0x64, 0x61, 0x64, | |
| 140 0x64, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x72, 0x65, 0x70, 0x6f, 0x73, | |
| 141 0x69, 0x74, 0x6f, 0x72, 0x79, 0x2f, 0x67, 0x64, 0x5f, 0x69, 0x6e, 0x74, | |
| 142 0x65, 0x72, 0x6d, 0x65, 0x64, 0x69, 0x61, 0x74, 0x65, 0x2e, 0x63, 0x72, | |
| 143 0x74, 0x30, 0x1f, 0x06, 0x03, 0x55, 0x1d, 0x23, 0x04, 0x18, 0x30, 0x16, | |
| 144 0x80, 0x14, 0xfd, 0xac, 0x61, 0x32, 0x93, 0x6c, 0x45, 0xd6, 0xe2, 0xee, | |
| 145 0x85, 0x5f, 0x9a, 0xba, 0xe7, 0x76, 0x99, 0x68, 0xcc, 0xe7, 0x30, 0x27, | |
| 146 0x86, 0x29, 0x68, 0x74, 0x74, 0x70, 0x3a, 0x2f, 0x2f, 0x63, 0x86, 0x30, | |
| 147 0x68, 0x74, 0x74, 0x70, 0x3a, 0x2f, 0x2f, 0x73, | |
| 148 }; | |
| 149 | |
| 150 // CertEntry represents a certificate in compressed form. Each entry is one of | |
| 151 // the three types enumerated in |Type|. | |
| 152 struct CertEntry { | |
| 153 public: | |
| 154 enum Type { | |
| 155 // Type 0 is reserved to mean "end of list" in the wire format. | |
| 156 | |
| 157 // COMPRESSED means that the certificate is included in the trailing zlib | |
| 158 // data. | |
| 159 COMPRESSED = 1, | |
| 160 // CACHED means that the certificate is already known to the peer and will | |
| 161 // be replaced by its 64-bit hash (in |hash|). | |
| 162 CACHED = 2, | |
| 163 // COMMON means that the certificate is in a common certificate set known | |
| 164 // to the peer with hash |set_hash| and certificate index |index|. | |
| 165 COMMON = 3, | |
| 166 }; | |
| 167 | |
| 168 Type type; | |
| 169 uint64 hash; | |
| 170 uint64 set_hash; | |
| 171 uint32 index; | |
| 172 }; | |
| 173 | |
| 174 // MatchCerts returns a vector of CertEntries describing how to most | |
| 175 // efficiently represent |certs| to a peer who has the common sets identified | |
| 176 // by |client_common_set_hashes| and who has cached the certificates with the | |
| 177 // 64-bit, FNV-1a hashes in |client_cached_cert_hashes|. | |
| 178 vector<CertEntry> MatchCerts(const vector<string>& certs, | |
| 179 StringPiece client_common_set_hashes, | |
| 180 StringPiece client_cached_cert_hashes, | |
| 181 const CommonCertSets* common_sets) { | |
| 182 vector<CertEntry> entries; | |
| 183 entries.reserve(certs.size()); | |
| 184 | |
| 185 const bool cached_valid = | |
| 186 client_cached_cert_hashes.size() % sizeof(uint64) == 0 && | |
| 187 !client_cached_cert_hashes.empty(); | |
| 188 | |
| 189 for (vector<string>::const_iterator i = certs.begin(); | |
| 190 i != certs.end(); ++i) { | |
| 191 CertEntry entry; | |
| 192 | |
| 193 if (cached_valid) { | |
| 194 bool cached = false; | |
| 195 | |
| 196 uint64 hash = QuicUtils::FNV1a_64_Hash(i->data(), i->size()); | |
| 197 // This assumes that the machine is little-endian. | |
| 198 for (size_t i = 0; i < client_cached_cert_hashes.size(); | |
| 199 i += sizeof(uint64)) { | |
| 200 uint64 cached_hash; | |
| 201 memcpy(&cached_hash, client_cached_cert_hashes.data() + i, | |
| 202 sizeof(uint64)); | |
| 203 if (hash != cached_hash) { | |
| 204 continue; | |
| 205 } | |
| 206 | |
| 207 entry.type = CertEntry::CACHED; | |
| 208 entry.hash = hash; | |
| 209 entries.push_back(entry); | |
| 210 cached = true; | |
| 211 break; | |
| 212 } | |
| 213 | |
| 214 if (cached) { | |
| 215 continue; | |
| 216 } | |
| 217 } | |
| 218 | |
| 219 if (common_sets && common_sets->MatchCert(*i, client_common_set_hashes, | |
| 220 &entry.set_hash, &entry.index)) { | |
| 221 entry.type = CertEntry::COMMON; | |
| 222 entries.push_back(entry); | |
| 223 continue; | |
| 224 } | |
| 225 | |
| 226 entry.type = CertEntry::COMPRESSED; | |
| 227 entries.push_back(entry); | |
| 228 } | |
| 229 | |
| 230 return entries; | |
| 231 } | |
| 232 | |
| 233 // CertEntriesSize returns the size, in bytes, of the serialised form of | |
| 234 // |entries|. | |
| 235 size_t CertEntriesSize(const vector<CertEntry>& entries) { | |
| 236 size_t entries_size = 0; | |
| 237 | |
| 238 for (vector<CertEntry>::const_iterator i = entries.begin(); | |
| 239 i != entries.end(); ++i) { | |
| 240 entries_size++; | |
| 241 switch (i->type) { | |
| 242 case CertEntry::COMPRESSED: | |
| 243 break; | |
| 244 case CertEntry::CACHED: | |
| 245 entries_size += sizeof(uint64); | |
| 246 break; | |
| 247 case CertEntry::COMMON: | |
| 248 entries_size += sizeof(uint64) + sizeof(uint32); | |
| 249 break; | |
| 250 } | |
| 251 } | |
| 252 | |
| 253 entries_size++; // for end marker | |
| 254 | |
| 255 return entries_size; | |
| 256 } | |
| 257 | |
| 258 // SerializeCertEntries serialises |entries| to |out|, which must have enough | |
| 259 // space to contain them. | |
| 260 void SerializeCertEntries(uint8* out, const vector<CertEntry>& entries) { | |
| 261 for (vector<CertEntry>::const_iterator i = entries.begin(); | |
| 262 i != entries.end(); ++i) { | |
| 263 *out++ = static_cast<uint8>(i->type); | |
| 264 switch (i->type) { | |
| 265 case CertEntry::COMPRESSED: | |
| 266 break; | |
| 267 case CertEntry::CACHED: | |
| 268 memcpy(out, &i->hash, sizeof(i->hash)); | |
| 269 out += sizeof(uint64); | |
| 270 break; | |
| 271 case CertEntry::COMMON: | |
| 272 // Assumes a little-endian machine. | |
| 273 memcpy(out, &i->set_hash, sizeof(i->set_hash)); | |
| 274 out += sizeof(i->set_hash); | |
| 275 memcpy(out, &i->index, sizeof(uint32)); | |
| 276 out += sizeof(uint32); | |
| 277 break; | |
| 278 } | |
| 279 } | |
| 280 | |
| 281 *out++ = 0; // end marker | |
| 282 } | |
| 283 | |
| 284 // ZlibDictForEntries returns a string that contains the zlib pre-shared | |
| 285 // dictionary to use in order to decompress a zlib block following |entries|. | |
| 286 // |certs| is one-to-one with |entries| and contains the certificates for those | |
| 287 // entries that are CACHED or COMMON. | |
| 288 string ZlibDictForEntries(const vector<CertEntry>& entries, | |
| 289 const vector<string>& certs) { | |
| 290 string zlib_dict; | |
| 291 | |
| 292 // The dictionary starts with the common and cached certs in reverse order. | |
| 293 size_t zlib_dict_size = 0; | |
| 294 for (size_t i = certs.size() - 1; i < certs.size(); i--) { | |
| 295 if (entries[i].type != CertEntry::COMPRESSED) { | |
| 296 zlib_dict_size += certs[i].size(); | |
| 297 } | |
| 298 } | |
| 299 | |
| 300 // At the end of the dictionary is a block of common certificate substrings. | |
| 301 zlib_dict_size += sizeof(kCommonCertSubstrings); | |
| 302 | |
| 303 zlib_dict.reserve(zlib_dict_size); | |
| 304 | |
| 305 for (size_t i = certs.size() - 1; i < certs.size(); i--) { | |
| 306 if (entries[i].type != CertEntry::COMPRESSED) { | |
| 307 zlib_dict += certs[i]; | |
| 308 } | |
| 309 } | |
| 310 | |
| 311 zlib_dict += string(reinterpret_cast<const char*>(kCommonCertSubstrings), | |
| 312 sizeof(kCommonCertSubstrings)); | |
| 313 | |
| 314 DCHECK_EQ(zlib_dict.size(), zlib_dict_size); | |
| 315 | |
| 316 return zlib_dict; | |
| 317 } | |
| 318 | |
| 319 // HashCerts returns the FNV-1a hashes of |certs|. | |
| 320 vector<uint64> HashCerts(const vector<string>& certs) { | |
| 321 vector<uint64> ret; | |
| 322 ret.reserve(certs.size()); | |
| 323 | |
| 324 for (vector<string>::const_iterator i = certs.begin(); | |
| 325 i != certs.end(); ++i) { | |
| 326 ret.push_back(QuicUtils::FNV1a_64_Hash(i->data(), i->size())); | |
| 327 } | |
| 328 | |
| 329 return ret; | |
| 330 } | |
| 331 | |
| 332 // ParseEntries parses the serialised form of a vector of CertEntries from | |
| 333 // |in_out| and writes them to |out_entries|. CACHED and COMMON entries are | |
| 334 // resolved using |cached_certs| and |common_sets| and written to |out_certs|. | |
| 335 // |in_out| is updated to contain the trailing data. | |
| 336 bool ParseEntries(StringPiece* in_out, | |
| 337 const vector<string>& cached_certs, | |
| 338 const CommonCertSets* common_sets, | |
| 339 vector<CertEntry>* out_entries, | |
| 340 vector<string>* out_certs) { | |
| 341 StringPiece in = *in_out; | |
| 342 vector<uint64> cached_hashes; | |
| 343 | |
| 344 out_entries->clear(); | |
| 345 out_certs->clear(); | |
| 346 | |
| 347 for (;;) { | |
| 348 if (in.empty()) { | |
| 349 return false; | |
| 350 } | |
| 351 CertEntry entry; | |
| 352 const uint8 type_byte = in[0]; | |
| 353 in.remove_prefix(1); | |
| 354 | |
| 355 if (type_byte == 0) { | |
| 356 break; | |
| 357 } | |
| 358 | |
| 359 entry.type = static_cast<CertEntry::Type>(type_byte); | |
| 360 | |
| 361 switch (entry.type) { | |
| 362 case CertEntry::COMPRESSED: | |
| 363 out_certs->push_back(string()); | |
| 364 break; | |
| 365 case CertEntry::CACHED: { | |
| 366 if (in.size() < sizeof(uint64)) { | |
| 367 return false; | |
| 368 } | |
| 369 memcpy(&entry.hash, in.data(), sizeof(uint64)); | |
| 370 in.remove_prefix(sizeof(uint64)); | |
| 371 | |
| 372 if (cached_hashes.size() != cached_certs.size()) { | |
| 373 cached_hashes = HashCerts(cached_certs); | |
| 374 } | |
| 375 bool found = false; | |
| 376 for (size_t i = 0; i < cached_hashes.size(); i++) { | |
| 377 if (cached_hashes[i] == entry.hash) { | |
| 378 out_certs->push_back(cached_certs[i]); | |
| 379 found = true; | |
| 380 break; | |
| 381 } | |
| 382 } | |
| 383 if (!found) { | |
| 384 return false; | |
| 385 } | |
| 386 break; | |
| 387 } | |
| 388 case CertEntry::COMMON: { | |
| 389 if (!common_sets) { | |
| 390 return false; | |
| 391 } | |
| 392 if (in.size() < sizeof(uint64) + sizeof(uint32)) { | |
| 393 return false; | |
| 394 } | |
| 395 memcpy(&entry.set_hash, in.data(), sizeof(uint64)); | |
| 396 in.remove_prefix(sizeof(uint64)); | |
| 397 memcpy(&entry.index, in.data(), sizeof(uint32)); | |
| 398 in.remove_prefix(sizeof(uint32)); | |
| 399 | |
| 400 StringPiece cert = common_sets->GetCert(entry.set_hash, entry.index); | |
| 401 if (cert.empty()) { | |
| 402 return false; | |
| 403 } | |
| 404 out_certs->push_back(cert.as_string()); | |
| 405 break; | |
| 406 } | |
| 407 default: | |
| 408 return false; | |
| 409 } | |
| 410 out_entries->push_back(entry); | |
| 411 } | |
| 412 | |
| 413 *in_out = in; | |
| 414 return true; | |
| 415 } | |
| 416 | |
| 417 // ScopedZLib deals with the automatic destruction of a zlib context. | |
| 418 class ScopedZLib { | |
| 419 public: | |
| 420 enum Type { | |
| 421 INFLATE, | |
| 422 DEFLATE, | |
| 423 }; | |
| 424 | |
| 425 explicit ScopedZLib(Type type) : z_(nullptr), type_(type) {} | |
| 426 | |
| 427 void reset(z_stream* z) { | |
| 428 Clear(); | |
| 429 z_ = z; | |
| 430 } | |
| 431 | |
| 432 ~ScopedZLib() { | |
| 433 Clear(); | |
| 434 } | |
| 435 | |
| 436 private: | |
| 437 void Clear() { | |
| 438 if (!z_) { | |
| 439 return; | |
| 440 } | |
| 441 | |
| 442 if (type_ == DEFLATE) { | |
| 443 deflateEnd(z_); | |
| 444 } else { | |
| 445 inflateEnd(z_); | |
| 446 } | |
| 447 z_ = nullptr; | |
| 448 } | |
| 449 | |
| 450 z_stream* z_; | |
| 451 const Type type_; | |
| 452 }; | |
| 453 | |
| 454 } // anonymous namespace | |
| 455 | |
| 456 | |
| 457 // static | |
| 458 string CertCompressor::CompressChain(const vector<string>& certs, | |
| 459 StringPiece client_common_set_hashes, | |
| 460 StringPiece client_cached_cert_hashes, | |
| 461 const CommonCertSets* common_sets) { | |
| 462 const vector<CertEntry> entries = MatchCerts( | |
| 463 certs, client_common_set_hashes, client_cached_cert_hashes, common_sets); | |
| 464 DCHECK_EQ(entries.size(), certs.size()); | |
| 465 | |
| 466 size_t uncompressed_size = 0; | |
| 467 for (size_t i = 0; i < entries.size(); i++) { | |
| 468 if (entries[i].type == CertEntry::COMPRESSED) { | |
| 469 uncompressed_size += 4 /* uint32 length */ + certs[i].size(); | |
| 470 } | |
| 471 } | |
| 472 | |
| 473 size_t compressed_size = 0; | |
| 474 z_stream z; | |
| 475 ScopedZLib scoped_z(ScopedZLib::DEFLATE); | |
| 476 | |
| 477 if (uncompressed_size > 0) { | |
| 478 memset(&z, 0, sizeof(z)); | |
| 479 int rv = deflateInit(&z, Z_DEFAULT_COMPRESSION); | |
| 480 DCHECK_EQ(Z_OK, rv); | |
| 481 if (rv != Z_OK) { | |
| 482 return ""; | |
| 483 } | |
| 484 scoped_z.reset(&z); | |
| 485 | |
| 486 string zlib_dict = ZlibDictForEntries(entries, certs); | |
| 487 | |
| 488 rv = deflateSetDictionary(&z, reinterpret_cast<const uint8*>(&zlib_dict[0]), | |
| 489 zlib_dict.size()); | |
| 490 DCHECK_EQ(Z_OK, rv); | |
| 491 if (rv != Z_OK) { | |
| 492 return ""; | |
| 493 } | |
| 494 | |
| 495 compressed_size = deflateBound(&z, uncompressed_size); | |
| 496 } | |
| 497 | |
| 498 const size_t entries_size = CertEntriesSize(entries); | |
| 499 | |
| 500 string result; | |
| 501 result.resize(entries_size + (uncompressed_size > 0 ? 4 : 0) + | |
| 502 compressed_size); | |
| 503 | |
| 504 uint8* j = reinterpret_cast<uint8*>(&result[0]); | |
| 505 SerializeCertEntries(j, entries); | |
| 506 j += entries_size; | |
| 507 | |
| 508 if (uncompressed_size == 0) { | |
| 509 return result; | |
| 510 } | |
| 511 | |
| 512 uint32 uncompressed_size_32 = uncompressed_size; | |
| 513 memcpy(j, &uncompressed_size_32, sizeof(uint32)); | |
| 514 j += sizeof(uint32); | |
| 515 | |
| 516 int rv; | |
| 517 | |
| 518 z.next_out = j; | |
| 519 z.avail_out = compressed_size; | |
| 520 | |
| 521 for (size_t i = 0; i < certs.size(); i++) { | |
| 522 if (entries[i].type != CertEntry::COMPRESSED) { | |
| 523 continue; | |
| 524 } | |
| 525 | |
| 526 uint32 length32 = certs[i].size(); | |
| 527 z.next_in = reinterpret_cast<uint8*>(&length32); | |
| 528 z.avail_in = sizeof(length32); | |
| 529 rv = deflate(&z, Z_NO_FLUSH); | |
| 530 DCHECK_EQ(Z_OK, rv); | |
| 531 DCHECK_EQ(0u, z.avail_in); | |
| 532 if (rv != Z_OK || z.avail_in) { | |
| 533 return ""; | |
| 534 } | |
| 535 | |
| 536 z.next_in = | |
| 537 const_cast<uint8*>(reinterpret_cast<const uint8*>(certs[i].data())); | |
| 538 z.avail_in = certs[i].size(); | |
| 539 rv = deflate(&z, Z_NO_FLUSH); | |
| 540 DCHECK_EQ(Z_OK, rv); | |
| 541 DCHECK_EQ(0u, z.avail_in); | |
| 542 if (rv != Z_OK || z.avail_in) { | |
| 543 return ""; | |
| 544 } | |
| 545 } | |
| 546 | |
| 547 z.avail_in = 0; | |
| 548 rv = deflate(&z, Z_FINISH); | |
| 549 DCHECK_EQ(Z_STREAM_END, rv); | |
| 550 if (rv != Z_STREAM_END) { | |
| 551 return ""; | |
| 552 } | |
| 553 | |
| 554 result.resize(result.size() - z.avail_out); | |
| 555 return result; | |
| 556 } | |
| 557 | |
| 558 // static | |
| 559 bool CertCompressor::DecompressChain(StringPiece in, | |
| 560 const vector<string>& cached_certs, | |
| 561 const CommonCertSets* common_sets, | |
| 562 vector<string>* out_certs) { | |
| 563 vector<CertEntry> entries; | |
| 564 if (!ParseEntries(&in, cached_certs, common_sets, &entries, out_certs)) { | |
| 565 return false; | |
| 566 } | |
| 567 DCHECK_EQ(entries.size(), out_certs->size()); | |
| 568 | |
| 569 scoped_ptr<uint8[]> uncompressed_data; | |
| 570 StringPiece uncompressed; | |
| 571 | |
| 572 if (!in.empty()) { | |
| 573 if (in.size() < sizeof(uint32)) { | |
| 574 return false; | |
| 575 } | |
| 576 | |
| 577 uint32 uncompressed_size; | |
| 578 memcpy(&uncompressed_size, in.data(), sizeof(uncompressed_size)); | |
| 579 in.remove_prefix(sizeof(uint32)); | |
| 580 | |
| 581 if (uncompressed_size > 128 * 1024) { | |
| 582 return false; | |
| 583 } | |
| 584 | |
| 585 uncompressed_data.reset(new uint8[uncompressed_size]); | |
| 586 z_stream z; | |
| 587 ScopedZLib scoped_z(ScopedZLib::INFLATE); | |
| 588 | |
| 589 memset(&z, 0, sizeof(z)); | |
| 590 z.next_out = uncompressed_data.get(); | |
| 591 z.avail_out = uncompressed_size; | |
| 592 z.next_in = const_cast<uint8*>(reinterpret_cast<const uint8*>(in.data())); | |
| 593 z.avail_in = in.size(); | |
| 594 | |
| 595 if (Z_OK != inflateInit(&z)) { | |
| 596 return false; | |
| 597 } | |
| 598 scoped_z.reset(&z); | |
| 599 | |
| 600 int rv = inflate(&z, Z_FINISH); | |
| 601 if (rv == Z_NEED_DICT) { | |
| 602 string zlib_dict = ZlibDictForEntries(entries, *out_certs); | |
| 603 const uint8* dict = reinterpret_cast<const uint8*>(zlib_dict.data()); | |
| 604 if (Z_OK != inflateSetDictionary(&z, dict, zlib_dict.size())) { | |
| 605 return false; | |
| 606 } | |
| 607 rv = inflate(&z, Z_FINISH); | |
| 608 } | |
| 609 | |
| 610 if (Z_STREAM_END != rv || z.avail_out > 0 || z.avail_in > 0) { | |
| 611 return false; | |
| 612 } | |
| 613 | |
| 614 uncompressed = StringPiece(reinterpret_cast<char*>(uncompressed_data.get()), | |
| 615 uncompressed_size); | |
| 616 } | |
| 617 | |
| 618 for (size_t i = 0; i < entries.size(); i++) { | |
| 619 switch (entries[i].type) { | |
| 620 case CertEntry::COMPRESSED: | |
| 621 if (uncompressed.size() < sizeof(uint32)) { | |
| 622 return false; | |
| 623 } | |
| 624 uint32 cert_len; | |
| 625 memcpy(&cert_len, uncompressed.data(), sizeof(cert_len)); | |
| 626 uncompressed.remove_prefix(sizeof(uint32)); | |
| 627 if (uncompressed.size() < cert_len) { | |
| 628 return false; | |
| 629 } | |
| 630 (*out_certs)[i] = uncompressed.substr(0, cert_len).as_string(); | |
| 631 uncompressed.remove_prefix(cert_len); | |
| 632 break; | |
| 633 case CertEntry::CACHED: | |
| 634 case CertEntry::COMMON: | |
| 635 break; | |
| 636 } | |
| 637 } | |
| 638 | |
| 639 if (!uncompressed.empty()) { | |
| 640 return false; | |
| 641 } | |
| 642 | |
| 643 return true; | |
| 644 } | |
| 645 | |
| 646 } // namespace net | |
| OLD | NEW |
|---|
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Issue 992733002:
Remove //net (except for Android test stuff) and sdch (Closed)
Base URL: git@github.com:domokit/mojo.git@master