chrome/common/extensions/api/networking_private/networking_private_crypto.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 "chrome/common/extensions/api/networking_private/networking_private_crypto.h"
   6
   7 #include <cert.h>
   8 #include <cryptohi.h>
   9 #include <keyhi.h>
  10 #include <keythi.h>
  11 #include <pk11pub.h>
  12 #include <sechash.h>
  13 #include <secport.h>
  14
  15 #include "base/base64.h"
  16 #include "base/memory/scoped_ptr.h"
  17 #include "base/strings/string_number_conversions.h"
  18 #include "base/strings/string_util.h"
  19 #include "base/strings/stringprintf.h"
  20 #include "crypto/nss_util.h"
  21 #include "crypto/rsa_private_key.h"
  22 #include "crypto/scoped_nss_types.h"
  23 #include "net/cert/pem_tokenizer.h"
  24 #include "net/cert/x509_certificate.h"
  25
  26 const unsigned char kTrustedCAPublicKeyDER[] = {
  27     0x30, 0x82, 0x01, 0x0a, 0x02, 0x82, 0x01, 0x01, 0x00, 0xbc, 0x22, 0x80,
  28     0xbd, 0x80, 0xf6, 0x3a, 0x21, 0x00, 0x3b, 0xae, 0x76, 0x5e, 0x35, 0x7f,
  29     0x3d, 0xc3, 0x64, 0x5c, 0x55, 0x94, 0x86, 0x34, 0x2f, 0x05, 0x87, 0x28,
  30     0xcd, 0xf7, 0x69, 0x8c, 0x17, 0xb3, 0x50, 0xa7, 0xb8, 0x82, 0xfa, 0xdf,
  31     0xc7, 0x43, 0x2d, 0xd6, 0x7e, 0xab, 0xa0, 0x6f, 0xb7, 0x13, 0x72, 0x80,
  32     0xa4, 0x47, 0x15, 0xc1, 0x20, 0x99, 0x50, 0xcd, 0xec, 0x14, 0x62, 0x09,
  33     0x5b, 0xa4, 0x98, 0xcd, 0xd2, 0x41, 0xb6, 0x36, 0x4e, 0xff, 0xe8, 0x2e,
  34     0x32, 0x30, 0x4a, 0x81, 0xa8, 0x42, 0xa3, 0x6c, 0x9b, 0x33, 0x6e, 0xca,
  35     0xb2, 0xf5, 0x53, 0x66, 0xe0, 0x27, 0x53, 0x86, 0x1a, 0x85, 0x1e, 0xa7,
  36     0x39, 0x3f, 0x4a, 0x77, 0x8e, 0xfb, 0x54, 0x66, 0x66, 0xfb, 0x58, 0x54,
  37     0xc0, 0x5e, 0x39, 0xc7, 0xf5, 0x50, 0x06, 0x0b, 0xe0, 0x8a, 0xd4, 0xce,
  38     0xe1, 0x6a, 0x55, 0x1f, 0x8b, 0x17, 0x00, 0xe6, 0x69, 0xa3, 0x27, 0xe6,
  39     0x08, 0x25, 0x69, 0x3c, 0x12, 0x9d, 0x8d, 0x05, 0x2c, 0xd6, 0x2e, 0xa2,
  40     0x31, 0xde, 0xb4, 0x52, 0x50, 0xd6, 0x20, 0x49, 0xde, 0x71, 0xa0, 0xf9,
  41     0xad, 0x20, 0x40, 0x12, 0xf1, 0xdd, 0x25, 0xeb, 0xd5, 0xe6, 0xb8, 0x36,
  42     0xf4, 0xd6, 0x8f, 0x7f, 0xca, 0x43, 0xdc, 0xd7, 0x10, 0x5b, 0xe6, 0x3f,
  43     0x51, 0x8a, 0x85, 0xb3, 0xf3, 0xff, 0xf6, 0x03, 0x2d, 0xcb, 0x23, 0x4f,
  44     0x9c, 0xad, 0x18, 0xe7, 0x93, 0x05, 0x8c, 0xac, 0x52, 0x9a, 0xf7, 0x4c,
  45     0xe9, 0x99, 0x7a, 0xbe, 0x6e, 0x7e, 0x4d, 0x0a, 0xe3, 0xc6, 0x1c, 0xa9,
  46     0x93, 0xfa, 0x3a, 0xa5, 0x91, 0x5d, 0x1c, 0xbd, 0x66, 0xeb, 0xcc, 0x60,
  47     0xdc, 0x86, 0x74, 0xca, 0xcf, 0xf8, 0x92, 0x1c, 0x98, 0x7d, 0x57, 0xfa,
  48     0x61, 0x47, 0x9e, 0xab, 0x80, 0xb7, 0xe4, 0x48, 0x80, 0x2a, 0x92, 0xc5,
  49     0x1b, 0x02, 0x03, 0x01, 0x00, 0x01};
  50
  51 namespace {
  52
  53 // Parses |pem_data| for a PEM block of |pem_type|.
  54 // Returns true if a |pem_type| block is found, storing the decoded result in
  55 // |der_output|.
  56 bool GetDERFromPEM(const std::string& pem_data,
  57                    const std::string& pem_type,
  58                    std::vector<uint8>* der_output) {
  59   std::vector<std::string> headers;
  60   headers.push_back(pem_type);
  61   net::PEMTokenizer pem_tok(pem_data, headers);
  62   if (!pem_tok.GetNext()) {
  63     return false;
  64   }
  65
  66   der_output->assign(pem_tok.data().begin(), pem_tok.data().end());
  67   return true;
  68 }
  69
  70 }  // namespace
  71
  72 NetworkingPrivateCrypto::NetworkingPrivateCrypto() {}
  73
  74 NetworkingPrivateCrypto::~NetworkingPrivateCrypto() {}
  75
  76 bool NetworkingPrivateCrypto::VerifyCredentials(
  77     const std::string& certificate,
  78     const std::string& signature,
  79     const std::string& data,
  80     const std::string& connected_mac) {
  81   crypto::EnsureNSSInit();
  82
  83   std::vector<uint8> cert_data;
  84   if (!GetDERFromPEM(certificate, "CERTIFICATE", &cert_data)) {
  85     LOG(ERROR) << "Failed to parse certificate.";
  86     return false;
  87   }
  88   SECItem der_cert;
  89   der_cert.type = siDERCertBuffer;
  90   der_cert.data = cert_data.data();
  91   der_cert.len = cert_data.size();
  92
  93   // Parse into a certificate structure.
  94   typedef scoped_ptr<
  95       CERTCertificate,
  96       crypto::NSSDestroyer<CERTCertificate, CERT_DestroyCertificate> >
  97       ScopedCERTCertificate;
  98   ScopedCERTCertificate cert(CERT_NewTempCertificate(
  99       CERT_GetDefaultCertDB(), &der_cert, NULL, PR_FALSE, PR_TRUE));
 100   if (!cert.get()) {
 101     LOG(ERROR) << "Failed to parse certificate.";
 102     return false;
 103   }
 104
 105   // Check that the certificate is signed by trusted CA.
 106   SECItem trusted_ca_key_der_item;
 107   trusted_ca_key_der_item.type = siDERCertBuffer;
 108   trusted_ca_key_der_item.data =
 109       const_cast<unsigned char*>(kTrustedCAPublicKeyDER),
 110   trusted_ca_key_der_item.len = sizeof(kTrustedCAPublicKeyDER);
 111   crypto::ScopedSECKEYPublicKey ca_public_key(
 112       SECKEY_ImportDERPublicKey(&trusted_ca_key_der_item, CKK_RSA));
 113   SECStatus verified = CERT_VerifySignedDataWithPublicKey(
 114       &cert->signatureWrap, ca_public_key.get(), NULL);
 115   if (verified != SECSuccess) {
 116     LOG(ERROR) << "Certificate is not issued by the trusted CA.";
 117     return false;
 118   }
 119
 120   // Check that the device listed in the certificate is correct.
 121   // Something like evt_e161 001a11ffacdf
 122   char* common_name = CERT_GetCommonName(&cert->subject);
 123   if (!common_name) {
 124     LOG(ERROR) << "Certificate does not have common name.";
 125     return false;
 126   }
 127
 128   std::string subject_name(common_name);
 129   PORT_Free(common_name);
 130   std::string translated_mac;
 131   base::RemoveChars(connected_mac, ":", &translated_mac);
 132   if (!EndsWith(subject_name, translated_mac, false)) {
 133     LOG(ERROR) << "MAC addresses don't match.";
 134     return false;
 135   }
 136
 137   // Make sure that the certificate matches the unsigned data presented.
 138   // Verify that the |signature| matches |data|.
 139   crypto::ScopedSECKEYPublicKey public_key(CERT_ExtractPublicKey(cert.get()));
 140   if (!public_key.get()) {
 141     LOG(ERROR) << "Unable to extract public key from certificate.";
 142     return false;
 143   }
 144   SECItem signature_item;
 145   signature_item.type = siBuffer;
 146   signature_item.data =
 147       reinterpret_cast<unsigned char*>(const_cast<char*>(signature.c_str()));
 148   signature_item.len = static_cast<unsigned int>(signature.size());
 149   verified = VFY_VerifyDataDirect(
 150       reinterpret_cast<unsigned char*>(const_cast<char*>(data.c_str())),
 151       data.size(),
 152       public_key.get(),
 153       &signature_item,
 154       SEC_OID_PKCS1_RSA_ENCRYPTION,
 155       SEC_OID_SHA1,
 156       NULL,
 157       NULL);
 158   if (verified != SECSuccess) {
 159     LOG(ERROR) << "Signed blobs did not match.";
 160     return false;
 161   }
 162   return true;
 163 }
 164
 165 bool NetworkingPrivateCrypto::EncryptByteString(
 166     const std::vector<uint8>& pub_key_der,
 167     const std::string& data,
 168     std::vector<uint8>* encrypted_output) {
 169   crypto::EnsureNSSInit();
 170
 171   SECItem pub_key_der_item;
 172   pub_key_der_item.type = siDERCertBuffer;
 173   pub_key_der_item.data = const_cast<unsigned char*>(pub_key_der.data());
 174   pub_key_der_item.len = pub_key_der.size();
 175
 176   crypto::ScopedSECKEYPublicKey public_key(
 177       SECKEY_ImportDERPublicKey(&pub_key_der_item, CKK_RSA));
 178   if (!public_key.get()) {
 179     LOG(ERROR) << "Failed to parse public key.";
 180     return false;
 181   }
 182
 183   size_t encrypted_length = SECKEY_PublicKeyStrength(public_key.get());
 184   // RSAES is defined as operating on messages up to a length of k - 11, where
 185   // k is the octet length of the RSA modulus.
 186   if (encrypted_length < data.size() + 11) {
 187     LOG(ERROR) << "Too much data to encrypt.";
 188     return false;
 189   }
 190
 191   scoped_ptr<unsigned char[]> rsa_output(new unsigned char[encrypted_length]);
 192   SECStatus encrypted = PK11_PubEncryptPKCS1(
 193       public_key.get(),
 194       rsa_output.get(),
 195       reinterpret_cast<unsigned char*>(const_cast<char*>(data.data())),
 196       data.length(),
 197       NULL);
 198   if (encrypted != SECSuccess) {
 199     LOG(ERROR) << "Error during encryption.";
 200     return false;
 201   }
 202   encrypted_output->assign(rsa_output.get(),
 203                            rsa_output.get() + encrypted_length);
 204   return true;
 205 }
 206
 207 bool NetworkingPrivateCrypto::DecryptByteString(
 208     const std::string& private_key_pem,
 209     const std::vector<uint8>& encrypted_data,
 210     std::string* decrypted_output) {
 211   crypto::EnsureNSSInit();
 212
 213   std::vector<uint8> private_key_data;
 214   if (!GetDERFromPEM(private_key_pem, "PRIVATE KEY", &private_key_data)) {
 215     LOG(ERROR) << "Failed to parse private key PEM.";
 216     return false;
 217   }
 218   scoped_ptr<crypto::RSAPrivateKey> private_key(
 219       crypto::RSAPrivateKey::CreateFromPrivateKeyInfo(private_key_data));
 220   if (!private_key || !private_key->public_key()) {
 221     LOG(ERROR) << "Failed to parse private key DER.";
 222     return false;
 223   }
 224
 225   size_t encrypted_length = SECKEY_SignatureLen(private_key->public_key());
 226   scoped_ptr<unsigned char[]> rsa_output(new unsigned char[encrypted_length]);
 227   unsigned int output_length = 0;
 228   SECStatus decrypted =
 229       PK11_PrivDecryptPKCS1(private_key->key(),
 230                             rsa_output.get(),
 231                             &output_length,
 232                             encrypted_length,
 233                             const_cast<unsigned char*>(encrypted_data.data()),
 234                             encrypted_data.size());
 235   if (decrypted != SECSuccess) {
 236     LOG(ERROR) << "Error during decryption.";
 237     return false;
 238   }
 239   decrypted_output->assign(reinterpret_cast<char*>(rsa_output.get()),
 240                            output_length);
 241   return true;
 242 }