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