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_macros.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       int cert_verify_flags,
  51       const BoundNetLog& net_log);
  52
  53   // Starts the proof verification.  If |QUIC_PENDING| is returned, then
  54   // |callback| will be invoked asynchronously when the verification completes.
  55   QuicAsyncStatus VerifyProof(const std::string& hostname,
  56                               const std::string& server_config,
  57                               const std::vector<std::string>& certs,
  58                               const std::string& signature,
  59                               std::string* error_details,
  60                               scoped_ptr<ProofVerifyDetails>* verify_details,
  61                               ProofVerifierCallback* callback);
  62
  63  private:
  64   enum State {
  65     STATE_NONE,
  66     STATE_VERIFY_CERT,
  67     STATE_VERIFY_CERT_COMPLETE,
  68   };
  69
  70   int DoLoop(int last_io_result);
  71   void OnIOComplete(int result);
  72   int DoVerifyCert(int result);
  73   int DoVerifyCertComplete(int result);
  74
  75   bool VerifySignature(const std::string& signed_data,
  76                        const std::string& signature,
  77                        const std::string& cert);
  78
  79   // Proof verifier to notify when this jobs completes.
  80   ProofVerifierChromium* proof_verifier_;
  81
  82   // The underlying verifier used for verifying certificates.
  83   CertVerifier* verifier_;
  84   scoped_ptr<CertVerifier::Request> cert_verifier_request_;
  85
  86   TransportSecurityState* transport_security_state_;
  87
  88   // |hostname| specifies the hostname for which |certs| is a valid chain.
  89   std::string hostname_;
  90
  91   scoped_ptr<ProofVerifierCallback> callback_;
  92   scoped_ptr<ProofVerifyDetailsChromium> verify_details_;
  93   std::string error_details_;
  94
  95   // X509Certificate from a chain of DER encoded certificates.
  96   scoped_refptr<X509Certificate> cert_;
  97
  98   // |cert_verify_flags| is bitwise OR'd of CertVerifier::VerifyFlags and it is
  99   // passed to CertVerifier::Verify.
 100   int cert_verify_flags_;
 101
 102   State next_state_;
 103
 104   BoundNetLog net_log_;
 105
 106   DISALLOW_COPY_AND_ASSIGN(Job);
 107 };
 108
 109 ProofVerifierChromium::Job::Job(
 110     ProofVerifierChromium* proof_verifier,
 111     CertVerifier* cert_verifier,
 112     TransportSecurityState* transport_security_state,
 113     int cert_verify_flags,
 114     const BoundNetLog& net_log)
 115     : proof_verifier_(proof_verifier),
 116       verifier_(cert_verifier),
 117       transport_security_state_(transport_security_state),
 118       cert_verify_flags_(cert_verify_flags),
 119       next_state_(STATE_NONE),
 120       net_log_(net_log) {
 121 }
 122
 123 QuicAsyncStatus ProofVerifierChromium::Job::VerifyProof(
 124     const string& hostname,
 125     const string& server_config,
 126     const vector<string>& certs,
 127     const string& signature,
 128     std::string* error_details,
 129     scoped_ptr<ProofVerifyDetails>* verify_details,
 130     ProofVerifierCallback* callback) {
 131   DCHECK(error_details);
 132   DCHECK(verify_details);
 133   DCHECK(callback);
 134
 135   error_details->clear();
 136
 137   if (STATE_NONE != next_state_) {
 138     *error_details = "Certificate is already set and VerifyProof has begun";
 139     DLOG(DFATAL) << *error_details;
 140     return QUIC_FAILURE;
 141   }
 142
 143   verify_details_.reset(new ProofVerifyDetailsChromium);
 144
 145   if (certs.empty()) {
 146     *error_details = "Failed to create certificate chain. Certs are empty.";
 147     DLOG(WARNING) << *error_details;
 148     verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID;
 149     *verify_details = verify_details_.Pass();
 150     return QUIC_FAILURE;
 151   }
 152
 153   // Convert certs to X509Certificate.
 154   vector<StringPiece> cert_pieces(certs.size());
 155   for (unsigned i = 0; i < certs.size(); i++) {
 156     cert_pieces[i] = base::StringPiece(certs[i]);
 157   }
 158   cert_ = X509Certificate::CreateFromDERCertChain(cert_pieces);
 159   if (!cert_.get()) {
 160     *error_details = "Failed to create certificate chain";
 161     DLOG(WARNING) << *error_details;
 162     verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID;
 163     *verify_details = verify_details_.Pass();
 164     return QUIC_FAILURE;
 165   }
 166
 167   // We call VerifySignature first to avoid copying of server_config and
 168   // signature.
 169   if (!VerifySignature(server_config, signature, certs[0])) {
 170     *error_details = "Failed to verify signature of server config";
 171     DLOG(WARNING) << *error_details;
 172     verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID;
 173     *verify_details = verify_details_.Pass();
 174     return QUIC_FAILURE;
 175   }
 176
 177   hostname_ = hostname;
 178
 179   next_state_ = STATE_VERIFY_CERT;
 180   switch (DoLoop(OK)) {
 181     case OK:
 182       *verify_details = verify_details_.Pass();
 183       return QUIC_SUCCESS;
 184     case ERR_IO_PENDING:
 185       callback_.reset(callback);
 186       return QUIC_PENDING;
 187     default:
 188       *error_details = error_details_;
 189       *verify_details = verify_details_.Pass();
 190       return QUIC_FAILURE;
 191   }
 192 }
 193
 194 int ProofVerifierChromium::Job::DoLoop(int last_result) {
 195   int rv = last_result;
 196   do {
 197     State state = next_state_;
 198     next_state_ = STATE_NONE;
 199     switch (state) {
 200       case STATE_VERIFY_CERT:
 201         DCHECK(rv == OK);
 202         rv = DoVerifyCert(rv);
 203         break;
 204       case STATE_VERIFY_CERT_COMPLETE:
 205         rv = DoVerifyCertComplete(rv);
 206         break;
 207       case STATE_NONE:
 208       default:
 209         rv = ERR_UNEXPECTED;
 210         LOG(DFATAL) << "unexpected state " << state;
 211         break;
 212     }
 213   } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
 214   return rv;
 215 }
 216
 217 void ProofVerifierChromium::Job::OnIOComplete(int result) {
 218   int rv = DoLoop(result);
 219   if (rv != ERR_IO_PENDING) {
 220     scoped_ptr<ProofVerifierCallback> callback(callback_.Pass());
 221     // Callback expects ProofVerifyDetails not ProofVerifyDetailsChromium.
 222     scoped_ptr<ProofVerifyDetails> verify_details(verify_details_.Pass());
 223     callback->Run(rv == OK, error_details_, &verify_details);
 224     // Will delete |this|.
 225     proof_verifier_->OnJobComplete(this);
 226   }
 227 }
 228
 229 int ProofVerifierChromium::Job::DoVerifyCert(int result) {
 230   next_state_ = STATE_VERIFY_CERT_COMPLETE;
 231
 232   return verifier_->Verify(
 233       cert_.get(), hostname_, std::string(), cert_verify_flags_,
 234       SSLConfigService::GetCRLSet().get(), &verify_details_->cert_verify_result,
 235       base::Bind(&ProofVerifierChromium::Job::OnIOComplete,
 236                  base::Unretained(this)),
 237       &cert_verifier_request_, net_log_);
 238 }
 239
 240 int ProofVerifierChromium::Job::DoVerifyCertComplete(int result) {
 241   cert_verifier_request_.reset();
 242
 243   const CertVerifyResult& cert_verify_result =
 244       verify_details_->cert_verify_result;
 245   const CertStatus cert_status = cert_verify_result.cert_status;
 246   if (transport_security_state_ &&
 247       (result == OK ||
 248        (IsCertificateError(result) && IsCertStatusMinorError(cert_status))) &&
 249       !transport_security_state_->CheckPublicKeyPins(
 250           hostname_,
 251           cert_verify_result.is_issued_by_known_root,
 252           cert_verify_result.public_key_hashes,
 253           &verify_details_->pinning_failure_log)) {
 254     result = ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN;
 255   }
 256
 257   scoped_refptr<ct::EVCertsWhitelist> ev_whitelist =
 258       SSLConfigService::GetEVCertsWhitelist();
 259   if ((cert_status & CERT_STATUS_IS_EV) && ev_whitelist.get() &&
 260       ev_whitelist->IsValid()) {
 261     const SHA256HashValue fingerprint(
 262         X509Certificate::CalculateFingerprint256(cert_->os_cert_handle()));
 263
 264     UMA_HISTOGRAM_BOOLEAN(
 265         "Net.SSL_EVCertificateInWhitelist",
 266         ev_whitelist->ContainsCertificateHash(
 267             std::string(reinterpret_cast<const char*>(fingerprint.data), 8)));
 268   }
 269
 270   if (result != OK) {
 271     std::string error_string = ErrorToString(result);
 272     error_details_ = StringPrintf("Failed to verify certificate chain: %s",
 273                                   error_string.c_str());
 274     DLOG(WARNING) << error_details_;
 275   }
 276
 277   // Exit DoLoop and return the result to the caller to VerifyProof.
 278   DCHECK_EQ(STATE_NONE, next_state_);
 279   return result;
 280 }
 281
 282 bool ProofVerifierChromium::Job::VerifySignature(const string& signed_data,
 283                                                  const string& signature,
 284                                                  const string& cert) {
 285   // TODO(rtenneti): Remove ScopedTracker below once crbug.com/422516 is fixed.
 286   tracked_objects::ScopedTracker tracking_profile(
 287       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 288           "422516 ProofVerifierChromium::Job::VerifySignature"));
 289
 290   StringPiece spki;
 291   if (!asn1::ExtractSPKIFromDERCert(cert, &spki)) {
 292     DLOG(WARNING) << "ExtractSPKIFromDERCert failed";
 293     return false;
 294   }
 295
 296   crypto::SignatureVerifier verifier;
 297
 298   size_t size_bits;
 299   X509Certificate::PublicKeyType type;
 300   X509Certificate::GetPublicKeyInfo(cert_->os_cert_handle(), &size_bits,
 301                                     &type);
 302   if (type == X509Certificate::kPublicKeyTypeRSA) {
 303     crypto::SignatureVerifier::HashAlgorithm hash_alg =
 304         crypto::SignatureVerifier::SHA256;
 305     crypto::SignatureVerifier::HashAlgorithm mask_hash_alg = hash_alg;
 306     unsigned int hash_len = 32;  // 32 is the length of a SHA-256 hash.
 307
 308     bool ok = verifier.VerifyInitRSAPSS(
 309         hash_alg, mask_hash_alg, hash_len,
 310         reinterpret_cast<const uint8*>(signature.data()), signature.size(),
 311         reinterpret_cast<const uint8*>(spki.data()), spki.size());
 312     if (!ok) {
 313       DLOG(WARNING) << "VerifyInitRSAPSS failed";
 314       return false;
 315     }
 316   } else if (type == X509Certificate::kPublicKeyTypeECDSA) {
 317     // This is the algorithm ID for ECDSA with SHA-256. Parameters are ABSENT.
 318     // RFC 5758:
 319     //   ecdsa-with-SHA256 OBJECT IDENTIFIER ::= { iso(1) member-body(2)
 320     //        us(840) ansi-X9-62(10045) signatures(4) ecdsa-with-SHA2(3) 2 }
 321     //   ...
 322     //   When the ecdsa-with-SHA224, ecdsa-with-SHA256, ecdsa-with-SHA384, or
 323     //   ecdsa-with-SHA512 algorithm identifier appears in the algorithm field
 324     //   as an AlgorithmIdentifier, the encoding MUST omit the parameters
 325     //   field.  That is, the AlgorithmIdentifier SHALL be a SEQUENCE of one
 326     //   component, the OID ecdsa-with-SHA224, ecdsa-with-SHA256, ecdsa-with-
 327     //   SHA384, or ecdsa-with-SHA512.
 328     // See also RFC 5480, Appendix A.
 329     static const uint8 kECDSAWithSHA256AlgorithmID[] = {
 330       0x30, 0x0a,
 331         0x06, 0x08,
 332           0x2a, 0x86, 0x48, 0xce, 0x3d, 0x04, 0x03, 0x02,
 333     };
 334
 335     if (!verifier.VerifyInit(
 336             kECDSAWithSHA256AlgorithmID, sizeof(kECDSAWithSHA256AlgorithmID),
 337             reinterpret_cast<const uint8*>(signature.data()),
 338             signature.size(),
 339             reinterpret_cast<const uint8*>(spki.data()),
 340             spki.size())) {
 341       DLOG(WARNING) << "VerifyInit failed";
 342       return false;
 343     }
 344   } else {
 345     LOG(ERROR) << "Unsupported public key type " << type;
 346     return false;
 347   }
 348
 349   verifier.VerifyUpdate(reinterpret_cast<const uint8*>(kProofSignatureLabel),
 350                         sizeof(kProofSignatureLabel));
 351   verifier.VerifyUpdate(reinterpret_cast<const uint8*>(signed_data.data()),
 352                         signed_data.size());
 353
 354   if (!verifier.VerifyFinal()) {
 355     DLOG(WARNING) << "VerifyFinal failed";
 356     return false;
 357   }
 358
 359   DVLOG(1) << "VerifyFinal success";
 360   return true;
 361 }
 362
 363 ProofVerifierChromium::ProofVerifierChromium(
 364     CertVerifier* cert_verifier,
 365     TransportSecurityState* transport_security_state)
 366     : cert_verifier_(cert_verifier),
 367       transport_security_state_(transport_security_state) {
 368 }
 369
 370 ProofVerifierChromium::~ProofVerifierChromium() {
 371   STLDeleteElements(&active_jobs_);
 372 }
 373
 374 QuicAsyncStatus ProofVerifierChromium::VerifyProof(
 375     const std::string& hostname,
 376     const std::string& server_config,
 377     const std::vector<std::string>& certs,
 378     const std::string& signature,
 379     const ProofVerifyContext* verify_context,
 380     std::string* error_details,
 381     scoped_ptr<ProofVerifyDetails>* verify_details,
 382     ProofVerifierCallback* callback) {
 383   if (!verify_context) {
 384     *error_details = "Missing context";
 385     return QUIC_FAILURE;
 386   }
 387   const ProofVerifyContextChromium* chromium_context =
 388       reinterpret_cast<const ProofVerifyContextChromium*>(verify_context);
 389   scoped_ptr<Job> job(new Job(this, cert_verifier_, transport_security_state_,
 390                               chromium_context->cert_verify_flags,
 391                               chromium_context->net_log));
 392   QuicAsyncStatus status =
 393       job->VerifyProof(hostname, server_config, certs, signature, error_details,
 394                        verify_details, callback);
 395   if (status == QUIC_PENDING) {
 396     active_jobs_.insert(job.release());
 397   }
 398   return status;
 399 }
 400
 401 void ProofVerifierChromium::OnJobComplete(Job* job) {
 402   active_jobs_.erase(job);
 403   delete job;
 404 }
 405
 406 }  // namespace net