1 // Copyright 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/proof_verifier_chromium.h" 6 7 #include "base/bind.h" 8 #include "base/bind_helpers.h" 9 #include "base/callback_helpers.h" 10 #include "base/compiler_specific.h" 11 #include "base/logging.h" 12 #include "base/strings/stringprintf.h" 13 #include "crypto/signature_verifier.h" 14 #include "net/base/net_errors.h" 15 #include "net/base/net_log.h" 16 #include "net/cert/asn1_util.h" 17 #include "net/cert/cert_status_flags.h" 18 #include "net/cert/cert_verifier.h" 19 #include "net/cert/cert_verify_result.h" 20 #include "net/cert/single_request_cert_verifier.h" 21 #include "net/cert/x509_certificate.h" 22 #include "net/cert/x509_util.h" 23 #include "net/quic/crypto/crypto_protocol.h" 24 #include "net/ssl/ssl_config_service.h" 25 26 using base::StringPiece; 27 using base::StringPrintf; 28 using std::string; 29 using std::vector; 30 31 namespace net { 32 33 ProofVerifierChromium::ProofVerifierChromium(CertVerifier* cert_verifier, 34 const BoundNetLog& net_log) 35 : cert_verifier_(cert_verifier), 36 next_state_(STATE_NONE), 37 net_log_(net_log) { 38 } 39 40 ProofVerifierChromium::~ProofVerifierChromium() { 41 verifier_.reset(); 42 } 43 44 ProofVerifierChromium::Status ProofVerifierChromium::VerifyProof( 45 const string& hostname, 46 const string& server_config, 47 const vector<string>& certs, 48 const string& signature, 49 std::string* error_details, 50 scoped_ptr<ProofVerifyDetails>* details, 51 ProofVerifierCallback* callback) { 52 DCHECK(error_details); 53 DCHECK(details); 54 DCHECK(callback); 55 56 callback_.reset(callback); 57 error_details->clear(); 58 59 DCHECK_EQ(STATE_NONE, next_state_); 60 if (STATE_NONE != next_state_) { 61 *error_details = "Certificate is already set and VerifyProof has begun"; 62 DLOG(WARNING) << *error_details; 63 return FAILURE; 64 } 65 66 verify_details_.reset(new ProofVerifyDetailsChromium); 67 68 if (certs.empty()) { 69 *error_details = "Failed to create certificate chain. Certs are empty."; 70 DLOG(WARNING) << *error_details; 71 verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID; 72 details->reset(verify_details_.release()); 73 return FAILURE; 74 } 75 76 // Convert certs to X509Certificate. 77 vector<StringPiece> cert_pieces(certs.size()); 78 for (unsigned i = 0; i < certs.size(); i++) { 79 cert_pieces[i] = base::StringPiece(certs[i]); 80 } 81 cert_ = X509Certificate::CreateFromDERCertChain(cert_pieces); 82 if (!cert_.get()) { 83 *error_details = "Failed to create certificate chain"; 84 DLOG(WARNING) << *error_details; 85 verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID; 86 details->reset(verify_details_.release()); 87 return FAILURE; 88 } 89 90 // We call VerifySignature first to avoid copying of server_config and 91 // signature. 92 if (!VerifySignature(server_config, signature, certs[0])) { 93 *error_details = "Failed to verify signature of server config"; 94 DLOG(WARNING) << *error_details; 95 verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID; 96 details->reset(verify_details_.release()); 97 return FAILURE; 98 } 99 100 hostname_ = hostname; 101 102 next_state_ = STATE_VERIFY_CERT; 103 switch (DoLoop(OK)) { 104 case OK: 105 details->reset(verify_details_.release()); 106 return SUCCESS; 107 case ERR_IO_PENDING: 108 return PENDING; 109 default: 110 *error_details = error_details_; 111 details->reset(verify_details_.release()); 112 return FAILURE; 113 } 114 } 115 116 int ProofVerifierChromium::DoLoop(int last_result) { 117 int rv = last_result; 118 do { 119 State state = next_state_; 120 next_state_ = STATE_NONE; 121 switch (state) { 122 case STATE_VERIFY_CERT: 123 DCHECK(rv == OK); 124 rv = DoVerifyCert(rv); 125 break; 126 case STATE_VERIFY_CERT_COMPLETE: 127 rv = DoVerifyCertComplete(rv); 128 break; 129 case STATE_NONE: 130 default: 131 rv = ERR_UNEXPECTED; 132 LOG(DFATAL) << "unexpected state " << state; 133 break; 134 } 135 } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE); 136 return rv; 137 } 138 139 void ProofVerifierChromium::OnIOComplete(int result) { 140 int rv = DoLoop(result); 141 if (rv != ERR_IO_PENDING) { 142 scoped_ptr<ProofVerifyDetails> scoped_details(verify_details_.release()); 143 callback_->Run(rv == OK, error_details_, &scoped_details); 144 callback_.reset(); 145 } 146 } 147 148 int ProofVerifierChromium::DoVerifyCert(int result) { 149 next_state_ = STATE_VERIFY_CERT_COMPLETE; 150 151 int flags = 0; 152 verifier_.reset(new SingleRequestCertVerifier(cert_verifier_)); 153 return verifier_->Verify( 154 cert_.get(), 155 hostname_, 156 flags, 157 SSLConfigService::GetCRLSet().get(), 158 &verify_details_->cert_verify_result, 159 base::Bind(&ProofVerifierChromium::OnIOComplete, 160 base::Unretained(this)), 161 net_log_); 162 } 163 164 int ProofVerifierChromium::DoVerifyCertComplete(int result) { 165 verifier_.reset(); 166 167 if (result <= ERR_FAILED) { 168 error_details_ = StringPrintf("Failed to verify certificate chain: %s", 169 ErrorToString(result)); 170 DLOG(WARNING) << error_details_; 171 result = ERR_FAILED; 172 } 173 174 // Exit DoLoop and return the result to the caller to VerifyProof. 175 DCHECK_EQ(STATE_NONE, next_state_); 176 return result; 177 } 178 179 bool ProofVerifierChromium::VerifySignature(const string& signed_data, 180 const string& signature, 181 const string& cert) { 182 StringPiece spki; 183 if (!asn1::ExtractSPKIFromDERCert(cert, &spki)) { 184 DLOG(WARNING) << "ExtractSPKIFromDERCert failed"; 185 return false; 186 } 187 188 crypto::SignatureVerifier verifier; 189 190 size_t size_bits; 191 X509Certificate::PublicKeyType type; 192 X509Certificate::GetPublicKeyInfo(cert_->os_cert_handle(), &size_bits, 193 &type); 194 if (type == X509Certificate::kPublicKeyTypeRSA) { 195 crypto::SignatureVerifier::HashAlgorithm hash_alg = 196 crypto::SignatureVerifier::SHA256; 197 crypto::SignatureVerifier::HashAlgorithm mask_hash_alg = hash_alg; 198 unsigned int hash_len = 32; // 32 is the length of a SHA-256 hash. 199 200 bool ok = verifier.VerifyInitRSAPSS( 201 hash_alg, mask_hash_alg, hash_len, 202 reinterpret_cast<const uint8*>(signature.data()), signature.size(), 203 reinterpret_cast<const uint8*>(spki.data()), spki.size()); 204 if (!ok) { 205 DLOG(WARNING) << "VerifyInitRSAPSS failed"; 206 return false; 207 } 208 } else if (type == X509Certificate::kPublicKeyTypeECDSA) { 209 // This is the algorithm ID for ECDSA with SHA-256. Parameters are ABSENT. 210 // RFC 5758: 211 // ecdsa-with-SHA256 OBJECT IDENTIFIER ::= { iso(1) member-body(2) 212 // us(840) ansi-X9-62(10045) signatures(4) ecdsa-with-SHA2(3) 2 } 213 // ... 214 // When the ecdsa-with-SHA224, ecdsa-with-SHA256, ecdsa-with-SHA384, or 215 // ecdsa-with-SHA512 algorithm identifier appears in the algorithm field 216 // as an AlgorithmIdentifier, the encoding MUST omit the parameters 217 // field. That is, the AlgorithmIdentifier SHALL be a SEQUENCE of one 218 // component, the OID ecdsa-with-SHA224, ecdsa-with-SHA256, ecdsa-with- 219 // SHA384, or ecdsa-with-SHA512. 220 // See also RFC 5480, Appendix A. 221 static const uint8 kECDSAWithSHA256AlgorithmID[] = { 222 0x30, 0x0a, 223 0x06, 0x08, 224 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x04, 0x03, 0x02, 225 }; 226 227 if (!verifier.VerifyInit( 228 kECDSAWithSHA256AlgorithmID, sizeof(kECDSAWithSHA256AlgorithmID), 229 reinterpret_cast<const uint8*>(signature.data()), 230 signature.size(), 231 reinterpret_cast<const uint8*>(spki.data()), 232 spki.size())) { 233 DLOG(WARNING) << "VerifyInit failed"; 234 return false; 235 } 236 } else { 237 LOG(ERROR) << "Unsupported public key type " << type; 238 return false; 239 } 240 241 verifier.VerifyUpdate(reinterpret_cast<const uint8*>(kProofSignatureLabel), 242 sizeof(kProofSignatureLabel)); 243 verifier.VerifyUpdate(reinterpret_cast<const uint8*>(signed_data.data()), 244 signed_data.size()); 245 246 if (!verifier.VerifyFinal()) { 247 DLOG(WARNING) << "VerifyFinal failed"; 248 return false; 249 } 250 251 DVLOG(1) << "VerifyFinal success"; 252 return true; 253 } 254 255 } // namespace net 256
