extensions/browser/api/cast_channel/cast_auth_ica.cc

   1 // Copyright 2014 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 "extensions/browser/api/cast_channel/cast_auth_ica.h"
   6
   7 #include "base/base64.h"
   8 #include "base/lazy_instance.h"
   9 #include "crypto/signature_verifier.h"
  10 #include "extensions/browser/api/cast_channel/cast_auth_util.h"
  11 #include "extensions/common/api/cast_channel/authority_keys.pb.h"
  12 #include "net/base/hash_value.h"
  13 #include "net/cert/x509_certificate.h"
  14
  15 namespace extensions {
  16 namespace api {
  17 namespace cast_channel {
  18 namespace {
  19
  20 // Fingerprint of the default ICA.
  21 static const net::SHA256HashValue kDefaultFingerprintICA = { {
  22     0x52, 0x9D, 0x9C, 0xD6, 0x7F, 0xE5, 0xEB, 0x69, 0x8E, 0x70, 0xDD, 0x26,
  23     0xD7, 0xD8, 0xF1, 0x26, 0x59, 0xF1, 0xE6, 0xE5, 0x23, 0x48, 0xBF, 0x6A,
  24     0x5C, 0xF7, 0x16, 0xE1, 0x3F, 0x41, 0x0E, 0x73
  25 } };
  26
  27 // Built in public key for verifying trusted authorities data.
  28 const uint8 kPublicKey[] = {
  29     0x30, 0x82, 0x01, 0x22, 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86,
  30     0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x01, 0x0F, 0x00,
  31     0x30, 0x82, 0x01, 0x0A, 0x02, 0x82, 0x01, 0x01, 0x00, 0xC3, 0x8D, 0xEC,
  32     0xF5, 0x94, 0x4C, 0x66, 0x90, 0xFC, 0x08, 0xED, 0x6E, 0x7D, 0xD0, 0xD6,
  33     0x93, 0x62, 0x94, 0x86, 0xFB, 0xBA, 0x6F, 0x06, 0xD5, 0x26, 0xAD, 0x52,
  34     0x84, 0x5A, 0x68, 0x52, 0xF1, 0xA9, 0x46, 0x04, 0x78, 0xC0, 0xA1, 0x0F,
  35     0x72, 0xCE, 0x1C, 0xB3, 0xD2, 0x34, 0xFA, 0x28, 0xD0, 0xA6, 0x2D, 0xDF,
  36     0xDF, 0x0C, 0x6C, 0x30, 0xCF, 0xF3, 0x67, 0x0E, 0xCE, 0xDD, 0x2D, 0x02,
  37     0x20, 0x05, 0x7D, 0x7F, 0x81, 0x19, 0xBC, 0x42, 0x74, 0xC0, 0x11, 0xC4,
  38     0x7F, 0x31, 0x0B, 0x63, 0xE7, 0x2E, 0xFE, 0xA4, 0x20, 0xE5, 0xD8, 0x19,
  39     0xE1, 0xBE, 0x25, 0x41, 0x88, 0xFA, 0xBB, 0x51, 0xFF, 0x84, 0x9E, 0x37,
  40     0x03, 0xAE, 0xAF, 0x41, 0x4E, 0x4B, 0x75, 0xF8, 0x73, 0x79, 0x20, 0x2B,
  41     0xA0, 0xE9, 0xFC, 0xD6, 0x03, 0x50, 0x1B, 0x2A, 0x6B, 0x31, 0xE8, 0x75,
  42     0x13, 0xB6, 0xEC, 0xE4, 0x5D, 0x2A, 0x3E, 0xE5, 0x49, 0x44, 0xBF, 0xE2,
  43     0xC2, 0x4A, 0x7B, 0xC8, 0xC2, 0xC9, 0x89, 0xEF, 0x1A, 0x67, 0x37, 0xB7,
  44     0x52, 0x93, 0x86, 0x69, 0xA4, 0x1A, 0x2C, 0x69, 0xD2, 0x03, 0x93, 0x15,
  45     0x02, 0x97, 0xB6, 0xF7, 0x55, 0x87, 0x5B, 0xAA, 0x73, 0x12, 0x3F, 0xDD,
  46     0x32, 0x16, 0x3B, 0x8E, 0xD9, 0xD9, 0x49, 0x06, 0x65, 0xAD, 0x28, 0x49,
  47     0xEA, 0x0F, 0x7E, 0x6A, 0x04, 0xF7, 0x89, 0x79, 0x8F, 0xCE, 0x3E, 0xD2,
  48     0x89, 0x6C, 0x43, 0x4B, 0x34, 0xBF, 0x42, 0x65, 0x2B, 0x09, 0x2F, 0x5C,
  49     0xCA, 0x46, 0x1C, 0x22, 0x36, 0x78, 0xEA, 0x98, 0x49, 0xA4, 0x0E, 0xAB,
  50     0x97, 0x0A, 0x76, 0xCD, 0x52, 0x99, 0x42, 0x44, 0xC2, 0x52, 0x40, 0x62,
  51     0x34, 0xC4, 0xCD, 0xE3, 0x3D, 0xCA, 0xE1, 0x33, 0x99, 0xE9, 0xF4, 0x6E,
  52     0xEB, 0xB0, 0x5D, 0xA5, 0x84, 0xA2, 0x5C, 0xC7, 0xBB, 0x14, 0x67, 0x0C,
  53     0x4F, 0x02, 0x03, 0x01, 0x00, 0x01};
  54
  55 // Verifies signature of the data using built-in public key.
  56 bool VerifySignature(const std::string& signature, const std::string& data) {
  57   if (signature.size() != 256)
  58     return false;
  59
  60   crypto::SignatureVerifier verifier;
  61   crypto::SignatureVerifier::HashAlgorithm hash_alg =
  62       crypto::SignatureVerifier::SHA256;
  63   crypto::SignatureVerifier::HashAlgorithm mask_hash_alg = hash_alg;
  64   unsigned int hash_len = 32;
  65
  66   if (!verifier.VerifyInitRSAPSS(
  67           hash_alg,
  68           mask_hash_alg,
  69           hash_len,
  70           reinterpret_cast<const uint8*>(signature.data()),
  71           signature.size(),
  72           kPublicKey,
  73           sizeof(kPublicKey))) {
  74     return false;
  75   }
  76
  77   verifier.VerifyUpdate(reinterpret_cast<const uint8*>(data.data()),
  78                         data.size());
  79
  80   return verifier.VerifyFinal();
  81 }
  82
  83 }  // namespace
  84
  85 AuthorityKeyStore::AuthorityKeyStore() {
  86 }
  87
  88 AuthorityKeyStore::~AuthorityKeyStore() {
  89 }
  90
  91 base::StringPiece AuthorityKeyStore::GetICAPublicKeyFromFingerprint(
  92     const net::SHA256HashValue& fingerprint) {
  93   AuthorityKeysMap::const_iterator it =
  94       certificate_authorities_.find(fingerprint);
  95   return (it == certificate_authorities_.end()) ? base::StringPiece()
  96                                                 : (*it).second;
  97 }
  98
  99 base::StringPiece AuthorityKeyStore::GetDefaultICAPublicKey() {
 100   return GetICAPublicKeyFromFingerprint(kDefaultFingerprintICA);
 101 }
 102
 103 bool AuthorityKeyStore::Load(const std::string& keys) {
 104   certificate_authorities_.clear();
 105   authority_keys_.reset(new proto::AuthorityKeys());
 106
 107   if (!authority_keys_->ParseFromString(keys))
 108     return false;
 109
 110   for (int i = 0; i < authority_keys_->keys_size(); i++) {
 111     const std::string& fingerprint = authority_keys_->keys(i).fingerprint();
 112     net::SHA256HashValue hash;
 113     // Ensure it's the size of SHA-256 fingerprint data.
 114     if (fingerprint.size() != sizeof(hash.data)) {
 115       return false;
 116     }
 117     memcpy(hash.data, fingerprint.data(), sizeof(hash.data));
 118     const std::string& public_key = authority_keys_->keys(i).public_key();
 119     certificate_authorities_.insert(
 120         make_pair(hash, base::StringPiece(public_key)));
 121   }
 122
 123   return true;
 124 }
 125
 126 // Trusted certificate authorities.
 127 static base::LazyInstance<AuthorityKeyStore>::Leaky g_authority_keys_store =
 128     LAZY_INSTANCE_INITIALIZER;
 129
 130 bool SetTrustedCertificateAuthorities(const std::string& keys,
 131                                       const std::string& signature) {
 132   std::string decoded_keys;
 133   if (!base::Base64Decode(keys, &decoded_keys))
 134     return false;
 135
 136   std::string decoded_signature;
 137   if (!base::Base64Decode(signature, &decoded_signature))
 138     return false;
 139
 140   if (!VerifySignature(decoded_signature, decoded_keys))
 141     return false;
 142
 143   return g_authority_keys_store.Get().Load(decoded_keys);
 144 }
 145
 146 base::StringPiece GetTrustedICAPublicKey(const base::StringPiece& data) {
 147   AuthorityKeyStore& authority_keys_store = g_authority_keys_store.Get();
 148   scoped_refptr<net::X509Certificate> ica_cert =
 149       net::X509Certificate::CreateFromBytes(data.data(), data.size());
 150   if (!ica_cert.get()) {
 151     LOG(ERROR) << "Invalid ICA certificate.";
 152     return "";
 153   }
 154   return authority_keys_store.GetICAPublicKeyFromFingerprint(
 155       net::X509Certificate::CalculateFingerprint256(
 156           ica_cert->os_cert_handle()));
 157 }
 158
 159 base::StringPiece GetDefaultTrustedICAPublicKey() {
 160   AuthorityKeyStore& authority_keys_store = g_authority_keys_store.Get();
 161   return authority_keys_store.GetDefaultICAPublicKey();
 162 }
 163
 164 }  // namespace cast_channel
 165 }  // namespace api
 166 }  // namespace extensions