net/quic/crypto/proof_verifier_chromium.cc

   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/metrics/histogram.h"
  13 #include "base/profiler/scoped_tracker.h"
  14 #include "base/stl_util.h"
  15 #include "base/strings/stringprintf.h"
  16 #include "crypto/signature_verifier.h"
  17 #include "net/base/net_errors.h"
  18 #include "net/cert/asn1_util.h"
  19 #include "net/cert/cert_status_flags.h"
  20 #include "net/cert/cert_verifier.h"
  21 #include "net/cert/cert_verify_result.h"
  22 #include "net/cert/x509_certificate.h"
  23 #include "net/cert/x509_util.h"
  24 #include "net/http/transport_security_state.h"
  25 #include "net/log/net_log.h"
  26 #include "net/quic/crypto/crypto_protocol.h"
  27 #include "net/ssl/ssl_config_service.h"
  28
  29 using base::StringPiece;
  30 using base::StringPrintf;
  31 using std::string;
  32 using std::vector;
  33
  34 namespace net {
  35
  36 ProofVerifyDetails* ProofVerifyDetailsChromium::Clone() const {
  37   ProofVerifyDetailsChromium* other = new ProofVerifyDetailsChromium;
  38   other->cert_verify_result = cert_verify_result;
  39   return other;
  40 }
  41
  42 // A Job handles the verification of a single proof.  It is owned by the
  43 // ProofVerifier. If the verification can not complete synchronously, it
  44 // will notify the ProofVerifier upon completion.
  45 class ProofVerifierChromium::Job {
  46  public:
  47   Job(ProofVerifierChromium* proof_verifier,
  48       CertVerifier* cert_verifier,
  49       TransportSecurityState* transport_security_state,
  50       const BoundNetLog& net_log);
  51
  52   // Starts the proof verification.  If |QUIC_PENDING| is returned, then
  53   // |callback| will be invoked asynchronously when the verification completes.
  54   QuicAsyncStatus VerifyProof(const std::string& hostname,
  55                               const std::string& server_config,
  56                               const std::vector<std::string>& certs,
  57                               const std::string& signature,
  58                               std::string* error_details,
  59                               scoped_ptr<ProofVerifyDetails>* verify_details,
  60                               ProofVerifierCallback* callback);
  61
  62  private:
  63   enum State {
  64     STATE_NONE,
  65     STATE_VERIFY_CERT,
  66     STATE_VERIFY_CERT_COMPLETE,
  67   };
  68
  69   int DoLoop(int last_io_result);
  70   void OnIOComplete(int result);
  71   int DoVerifyCert(int result);
  72   int DoVerifyCertComplete(int result);
  73
  74   bool VerifySignature(const std::string& signed_data,
  75                        const std::string& signature,
  76                        const std::string& cert);
  77
  78   // Proof verifier to notify when this jobs completes.
  79   ProofVerifierChromium* proof_verifier_;
  80
  81   // The underlying verifier used for verifying certificates.
  82   CertVerifier* verifier_;
  83   scoped_ptr<CertVerifier::Request> cert_verifier_request_;
  84
  85   TransportSecurityState* transport_security_state_;
  86
  87   // |hostname| specifies the hostname for which |certs| is a valid chain.
  88   std::string hostname_;
  89
  90   scoped_ptr<ProofVerifierCallback> callback_;
  91   scoped_ptr<ProofVerifyDetailsChromium> verify_details_;
  92   std::string error_details_;
  93
  94   // X509Certificate from a chain of DER encoded certificates.
  95   scoped_refptr<X509Certificate> cert_;
  96
  97   State next_state_;
  98
  99   BoundNetLog net_log_;
 100
 101   DISALLOW_COPY_AND_ASSIGN(Job);
 102 };
 103
 104 ProofVerifierChromium::Job::Job(
 105     ProofVerifierChromium* proof_verifier,
 106     CertVerifier* cert_verifier,
 107     TransportSecurityState* transport_security_state,
 108     const BoundNetLog& net_log)
 109     : proof_verifier_(proof_verifier),
 110       verifier_(cert_verifier),
 111       transport_security_state_(transport_security_state),
 112       next_state_(STATE_NONE),
 113       net_log_(net_log) {
 114 }
 115
 116 QuicAsyncStatus ProofVerifierChromium::Job::VerifyProof(
 117     const string& hostname,
 118     const string& server_config,
 119     const vector<string>& certs,
 120     const string& signature,
 121     std::string* error_details,
 122     scoped_ptr<ProofVerifyDetails>* verify_details,
 123     ProofVerifierCallback* callback) {
 124   DCHECK(error_details);
 125   DCHECK(verify_details);
 126   DCHECK(callback);
 127
 128   error_details->clear();
 129
 130   if (STATE_NONE != next_state_) {
 131     *error_details = "Certificate is already set and VerifyProof has begun";
 132     DLOG(DFATAL) << *error_details;
 133     return QUIC_FAILURE;
 134   }
 135
 136   verify_details_.reset(new ProofVerifyDetailsChromium);
 137
 138   if (certs.empty()) {
 139     *error_details = "Failed to create certificate chain. Certs are empty.";
 140     DLOG(WARNING) << *error_details;
 141     verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID;
 142     *verify_details = verify_details_.Pass();
 143     return QUIC_FAILURE;
 144   }
 145
 146   // Convert certs to X509Certificate.
 147   vector<StringPiece> cert_pieces(certs.size());
 148   for (unsigned i = 0; i < certs.size(); i++) {
 149     cert_pieces[i] = base::StringPiece(certs[i]);
 150   }
 151   cert_ = X509Certificate::CreateFromDERCertChain(cert_pieces);
 152   if (!cert_.get()) {
 153     *error_details = "Failed to create certificate chain";
 154     DLOG(WARNING) << *error_details;
 155     verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID;
 156     *verify_details = verify_details_.Pass();
 157     return QUIC_FAILURE;
 158   }
 159
 160   // We call VerifySignature first to avoid copying of server_config and
 161   // signature.
 162   if (!VerifySignature(server_config, signature, certs[0])) {
 163     *error_details = "Failed to verify signature of server config";
 164     DLOG(WARNING) << *error_details;
 165     verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID;
 166     *verify_details = verify_details_.Pass();
 167     return QUIC_FAILURE;
 168   }
 169
 170   hostname_ = hostname;
 171
 172   next_state_ = STATE_VERIFY_CERT;
 173   switch (DoLoop(OK)) {
 174     case OK:
 175       *verify_details = verify_details_.Pass();
 176       return QUIC_SUCCESS;
 177     case ERR_IO_PENDING:
 178       callback_.reset(callback);
 179       return QUIC_PENDING;
 180     default:
 181       *error_details = error_details_;
 182       *verify_details = verify_details_.Pass();
 183       return QUIC_FAILURE;
 184   }
 185 }
 186
 187 int ProofVerifierChromium::Job::DoLoop(int last_result) {
 188   int rv = last_result;
 189   do {
 190     State state = next_state_;
 191     next_state_ = STATE_NONE;
 192     switch (state) {
 193       case STATE_VERIFY_CERT:
 194         DCHECK(rv == OK);
 195         rv = DoVerifyCert(rv);
 196         break;
 197       case STATE_VERIFY_CERT_COMPLETE:
 198         rv = DoVerifyCertComplete(rv);
 199         break;
 200       case STATE_NONE:
 201       default:
 202         rv = ERR_UNEXPECTED;
 203         LOG(DFATAL) << "unexpected state " << state;
 204         break;
 205     }
 206   } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
 207   return rv;
 208 }
 209
 210 void ProofVerifierChromium::Job::OnIOComplete(int result) {
 211   int rv = DoLoop(result);
 212   if (rv != ERR_IO_PENDING) {
 213     scoped_ptr<ProofVerifierCallback> callback(callback_.Pass());
 214     // Callback expects ProofVerifyDetails not ProofVerifyDetailsChromium.
 215     scoped_ptr<ProofVerifyDetails> verify_details(verify_details_.Pass());
 216     callback->Run(rv == OK, error_details_, &verify_details);
 217     // Will delete |this|.
 218     proof_verifier_->OnJobComplete(this);
 219   }
 220 }
 221
 222 int ProofVerifierChromium::Job::DoVerifyCert(int result) {
 223   next_state_ = STATE_VERIFY_CERT_COMPLETE;
 224
 225   int flags = 0;
 226   return verifier_->Verify(cert_.get(), hostname_, std::string(), flags,
 227                            SSLConfigService::GetCRLSet().get(),
 228                            &verify_details_->cert_verify_result,
 229                            base::Bind(&ProofVerifierChromium::Job::OnIOComplete,
 230                                       base::Unretained(this)),
 231                            &cert_verifier_request_, net_log_);
 232 }
 233
 234 int ProofVerifierChromium::Job::DoVerifyCertComplete(int result) {
 235   cert_verifier_request_.reset();
 236
 237   const CertVerifyResult& cert_verify_result =
 238       verify_details_->cert_verify_result;
 239   const CertStatus cert_status = cert_verify_result.cert_status;
 240   if (transport_security_state_ &&
 241       (result == OK ||
 242        (IsCertificateError(result) && IsCertStatusMinorError(cert_status))) &&
 243       !transport_security_state_->CheckPublicKeyPins(
 244           hostname_,
 245           cert_verify_result.is_issued_by_known_root,
 246           cert_verify_result.public_key_hashes,
 247           &verify_details_->pinning_failure_log)) {
 248     result = ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN;
 249   }
 250
 251   scoped_refptr<ct::EVCertsWhitelist> ev_whitelist =
 252       SSLConfigService::GetEVCertsWhitelist();
 253   if ((cert_status & CERT_STATUS_IS_EV) && ev_whitelist.get() &&
 254       ev_whitelist->IsValid()) {
 255     const SHA256HashValue fingerprint(
 256         X509Certificate::CalculateFingerprint256(cert_->os_cert_handle()));
 257
 258     UMA_HISTOGRAM_BOOLEAN(
 259         "Net.SSL_EVCertificateInWhitelist",
 260         ev_whitelist->ContainsCertificateHash(
 261             std::string(reinterpret_cast<const char*>(fingerprint.data), 8)));
 262   }
 263
 264   if (result != OK) {
 265     std::string error_string = ErrorToString(result);
 266     error_details_ = StringPrintf("Failed to verify certificate chain: %s",
 267                                   error_string.c_str());
 268     DLOG(WARNING) << error_details_;
 269   }
 270
 271   // Exit DoLoop and return the result to the caller to VerifyProof.
 272   DCHECK_EQ(STATE_NONE, next_state_);
 273   return result;
 274 }
 275
 276 bool ProofVerifierChromium::Job::VerifySignature(const string& signed_data,
 277                                                  const string& signature,
 278                                                  const string& cert) {
 279   // TODO(rtenneti): Remove ScopedTracker below once crbug.com/422516 is fixed.
 280   tracked_objects::ScopedTracker tracking_profile(
 281       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 282           "422516 ProofVerifierChromium::Job::VerifySignature"));
 283
 284   StringPiece spki;
 285   if (!asn1::ExtractSPKIFromDERCert(cert, &spki)) {
 286     DLOG(WARNING) << "ExtractSPKIFromDERCert failed";
 287     return false;
 288   }
 289
 290   crypto::SignatureVerifier verifier;
 291
 292   size_t size_bits;
 293   X509Certificate::PublicKeyType type;
 294   X509Certificate::GetPublicKeyInfo(cert_->os_cert_handle(), &size_bits,
 295                                     &type);
 296   if (type == X509Certificate::kPublicKeyTypeRSA) {
 297     crypto::SignatureVerifier::HashAlgorithm hash_alg =
 298         crypto::SignatureVerifier::SHA256;
 299     crypto::SignatureVerifier::HashAlgorithm mask_hash_alg = hash_alg;
 300     unsigned int hash_len = 32;  // 32 is the length of a SHA-256 hash.
 301
 302     bool ok = verifier.VerifyInitRSAPSS(
 303         hash_alg, mask_hash_alg, hash_len,
 304         reinterpret_cast<const uint8*>(signature.data()), signature.size(),
 305         reinterpret_cast<const uint8*>(spki.data()), spki.size());
 306     if (!ok) {
 307       DLOG(WARNING) << "VerifyInitRSAPSS failed";
 308       return false;
 309     }
 310   } else if (type == X509Certificate::kPublicKeyTypeECDSA) {
 311     // This is the algorithm ID for ECDSA with SHA-256. Parameters are ABSENT.
 312     // RFC 5758:
 313     //   ecdsa-with-SHA256 OBJECT IDENTIFIER ::= { iso(1) member-body(2)
 314     //        us(840) ansi-X9-62(10045) signatures(4) ecdsa-with-SHA2(3) 2 }
 315     //   ...
 316     //   When the ecdsa-with-SHA224, ecdsa-with-SHA256, ecdsa-with-SHA384, or
 317     //   ecdsa-with-SHA512 algorithm identifier appears in the algorithm field
 318     //   as an AlgorithmIdentifier, the encoding MUST omit the parameters
 319     //   field.  That is, the AlgorithmIdentifier SHALL be a SEQUENCE of one
 320     //   component, the OID ecdsa-with-SHA224, ecdsa-with-SHA256, ecdsa-with-
 321     //   SHA384, or ecdsa-with-SHA512.
 322     // See also RFC 5480, Appendix A.
 323     static const uint8 kECDSAWithSHA256AlgorithmID[] = {
 324       0x30, 0x0a,
 325         0x06, 0x08,
 326           0x2a, 0x86, 0x48, 0xce, 0x3d, 0x04, 0x03, 0x02,
 327     };
 328
 329     if (!verifier.VerifyInit(
 330             kECDSAWithSHA256AlgorithmID, sizeof(kECDSAWithSHA256AlgorithmID),
 331             reinterpret_cast<const uint8*>(signature.data()),
 332             signature.size(),
 333             reinterpret_cast<const uint8*>(spki.data()),
 334             spki.size())) {
 335       DLOG(WARNING) << "VerifyInit failed";
 336       return false;
 337     }
 338   } else {
 339     LOG(ERROR) << "Unsupported public key type " << type;
 340     return false;
 341   }
 342
 343   verifier.VerifyUpdate(reinterpret_cast<const uint8*>(kProofSignatureLabel),
 344                         sizeof(kProofSignatureLabel));
 345   verifier.VerifyUpdate(reinterpret_cast<const uint8*>(signed_data.data()),
 346                         signed_data.size());
 347
 348   if (!verifier.VerifyFinal()) {
 349     DLOG(WARNING) << "VerifyFinal failed";
 350     return false;
 351   }
 352
 353   DVLOG(1) << "VerifyFinal success";
 354   return true;
 355 }
 356
 357 ProofVerifierChromium::ProofVerifierChromium(
 358     CertVerifier* cert_verifier,
 359     TransportSecurityState* transport_security_state)
 360     : cert_verifier_(cert_verifier),
 361       transport_security_state_(transport_security_state) {
 362 }
 363
 364 ProofVerifierChromium::~ProofVerifierChromium() {
 365   STLDeleteElements(&active_jobs_);
 366 }
 367
 368 QuicAsyncStatus ProofVerifierChromium::VerifyProof(
 369     const std::string& hostname,
 370     const std::string& server_config,
 371     const std::vector<std::string>& certs,
 372     const std::string& signature,
 373     const ProofVerifyContext* verify_context,
 374     std::string* error_details,
 375     scoped_ptr<ProofVerifyDetails>* verify_details,
 376     ProofVerifierCallback* callback) {
 377   if (!verify_context) {
 378     *error_details = "Missing context";
 379     return QUIC_FAILURE;
 380   }
 381   const ProofVerifyContextChromium* chromium_context =
 382       reinterpret_cast<const ProofVerifyContextChromium*>(verify_context);
 383   scoped_ptr<Job> job(new Job(this,
 384                               cert_verifier_,
 385                               transport_security_state_,
 386                               chromium_context->net_log));
 387   QuicAsyncStatus status = job->VerifyProof(hostname, server_config, certs,
 388                                             signature, error_details,
 389                                             verify_details, callback);
 390   if (status == QUIC_PENDING) {
 391     active_jobs_.insert(job.release());
 392   }
 393   return status;
 394 }
 395
 396 void ProofVerifierChromium::OnJobComplete(Job* job) {
 397   active_jobs_.erase(job);
 398   delete job;
 399 }
 400
 401 }  // namespace net