net/cert/cert_verify_proc_android.cc

   1 // Copyright (c) 2012 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/cert/cert_verify_proc_android.h"
   6
   7 #include <string>
   8 #include <vector>
   9
  10 #include "base/logging.h"
  11 #include "base/sha1.h"
  12 #include "base/strings/string_piece.h"
  13 #include "crypto/sha2.h"
  14 #include "net/android/cert_verify_result_android.h"
  15 #include "net/android/network_library.h"
  16 #include "net/base/net_errors.h"
  17 #include "net/cert/asn1_util.h"
  18 #include "net/cert/cert_status_flags.h"
  19 #include "net/cert/cert_verify_result.h"
  20 #include "net/cert/x509_certificate.h"
  21
  22 namespace net {
  23
  24 namespace {
  25
  26 // Returns true if the certificate verification call was successful (regardless
  27 // of its result), i.e. if |verify_result| was set. Otherwise returns false.
  28 bool VerifyFromAndroidTrustManager(const std::vector<std::string>& cert_bytes,
  29                                    const std::string& hostname,
  30                                    CertVerifyResult* verify_result) {
  31   android::CertVerifyStatusAndroid status;
  32   std::vector<std::string> verified_chain;
  33
  34   // TODO(joth): Fetch the authentication type from SSL rather than hardcode.
  35   android::VerifyX509CertChain(cert_bytes, "RSA", hostname,
  36                                &status, &verify_result->is_issued_by_known_root,
  37                                &verified_chain);
  38   switch (status) {
  39     case android::VERIFY_FAILED:
  40       return false;
  41     case android::VERIFY_OK:
  42       break;
  43     case android::VERIFY_NO_TRUSTED_ROOT:
  44       verify_result->cert_status |= CERT_STATUS_AUTHORITY_INVALID;
  45       break;
  46     case android::VERIFY_EXPIRED:
  47     case android::VERIFY_NOT_YET_VALID:
  48       verify_result->cert_status |= CERT_STATUS_DATE_INVALID;
  49       break;
  50     case android::VERIFY_UNABLE_TO_PARSE:
  51       verify_result->cert_status |= CERT_STATUS_INVALID;
  52       break;
  53     case android::VERIFY_INCORRECT_KEY_USAGE:
  54       verify_result->cert_status |= CERT_STATUS_INVALID;
  55       break;
  56     default:
  57       NOTREACHED();
  58       verify_result->cert_status |= CERT_STATUS_INVALID;
  59       break;
  60   }
  61
  62   // Save the verified chain.
  63   if (!verified_chain.empty()) {
  64     std::vector<base::StringPiece> verified_chain_pieces(verified_chain.size());
  65     for (size_t i = 0; i < verified_chain.size(); i++) {
  66       verified_chain_pieces[i] = base::StringPiece(verified_chain[i]);
  67     }
  68     scoped_refptr<X509Certificate> verified_cert =
  69         X509Certificate::CreateFromDERCertChain(verified_chain_pieces);
  70     if (verified_cert)
  71       verify_result->verified_cert = verified_cert;
  72   }
  73
  74   // Extract the public key hashes.
  75   for (size_t i = 0; i < verified_chain.size(); i++) {
  76     base::StringPiece spki_bytes;
  77     if (!asn1::ExtractSPKIFromDERCert(verified_chain[i], &spki_bytes))
  78       continue;
  79
  80     HashValue sha1(HASH_VALUE_SHA1);
  81     base::SHA1HashBytes(reinterpret_cast<const uint8*>(spki_bytes.data()),
  82                         spki_bytes.size(), sha1.data());
  83     verify_result->public_key_hashes.push_back(sha1);
  84
  85     HashValue sha256(HASH_VALUE_SHA256);
  86     crypto::SHA256HashString(spki_bytes, sha256.data(), crypto::kSHA256Length);
  87     verify_result->public_key_hashes.push_back(sha256);
  88   }
  89
  90   return true;
  91 }
  92
  93 bool GetChainDEREncodedBytes(X509Certificate* cert,
  94                              std::vector<std::string>* chain_bytes) {
  95   X509Certificate::OSCertHandle cert_handle = cert->os_cert_handle();
  96   X509Certificate::OSCertHandles cert_handles =
  97       cert->GetIntermediateCertificates();
  98
  99   // Make sure the peer's own cert is the first in the chain, if it's not
 100   // already there.
 101   if (cert_handles.empty() || cert_handles[0] != cert_handle)
 102     cert_handles.insert(cert_handles.begin(), cert_handle);
 103
 104   chain_bytes->reserve(cert_handles.size());
 105   for (X509Certificate::OSCertHandles::const_iterator it =
 106        cert_handles.begin(); it != cert_handles.end(); ++it) {
 107     std::string cert_bytes;
 108     if(!X509Certificate::GetDEREncoded(*it, &cert_bytes))
 109       return false;
 110     chain_bytes->push_back(cert_bytes);
 111   }
 112   return true;
 113 }
 114
 115 }  // namespace
 116
 117 CertVerifyProcAndroid::CertVerifyProcAndroid() {}
 118
 119 CertVerifyProcAndroid::~CertVerifyProcAndroid() {}
 120
 121 bool CertVerifyProcAndroid::SupportsAdditionalTrustAnchors() const {
 122   return false;
 123 }
 124
 125 int CertVerifyProcAndroid::VerifyInternal(
 126     X509Certificate* cert,
 127     const std::string& hostname,
 128     int flags,
 129     CRLSet* crl_set,
 130     const CertificateList& additional_trust_anchors,
 131     CertVerifyResult* verify_result) {
 132   if (!cert->VerifyNameMatch(hostname,
 133                              &verify_result->common_name_fallback_used)) {
 134     verify_result->cert_status |= CERT_STATUS_COMMON_NAME_INVALID;
 135   }
 136
 137   std::vector<std::string> cert_bytes;
 138   if (!GetChainDEREncodedBytes(cert, &cert_bytes))
 139     return ERR_CERT_INVALID;
 140   if (!VerifyFromAndroidTrustManager(cert_bytes, hostname, verify_result)) {
 141     NOTREACHED();
 142     return ERR_FAILED;
 143   }
 144   if (IsCertStatusError(verify_result->cert_status))
 145     return MapCertStatusToNetError(verify_result->cert_status);
 146
 147   return OK;
 148 }
 149
 150 }  // namespace net