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 "chrome/browser/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 26const unsigned char kTrustedCAPublicKeyDER[] = { 27 0x30, 0x82, 0x01, 0x0a, 0x02, 0x82, 0x01, 0x01, 0x00, 0xbc, 0x22, 0x80, 0xbd, 28 0x80, 0xf6, 0x3a, 0x21, 0x00, 0x3b, 0xae, 0x76, 0x5e, 0x35, 0x7f, 0x3d, 0xc3, 29 0x64, 0x5c, 0x55, 0x94, 0x86, 0x34, 0x2f, 0x05, 0x87, 0x28, 0xcd, 0xf7, 0x69, 30 0x8c, 0x17, 0xb3, 0x50, 0xa7, 0xb8, 0x82, 0xfa, 0xdf, 0xc7, 0x43, 0x2d, 0xd6, 31 0x7e, 0xab, 0xa0, 0x6f, 0xb7, 0x13, 0x72, 0x80, 0xa4, 0x47, 0x15, 0xc1, 0x20, 32 0x99, 0x50, 0xcd, 0xec, 0x14, 0x62, 0x09, 0x5b, 0xa4, 0x98, 0xcd, 0xd2, 0x41, 33 0xb6, 0x36, 0x4e, 0xff, 0xe8, 0x2e, 0x32, 0x30, 0x4a, 0x81, 0xa8, 0x42, 0xa3, 34 0x6c, 0x9b, 0x33, 0x6e, 0xca, 0xb2, 0xf5, 0x53, 0x66, 0xe0, 0x27, 0x53, 0x86, 35 0x1a, 0x85, 0x1e, 0xa7, 0x39, 0x3f, 0x4a, 0x77, 0x8e, 0xfb, 0x54, 0x66, 0x66, 36 0xfb, 0x58, 0x54, 0xc0, 0x5e, 0x39, 0xc7, 0xf5, 0x50, 0x06, 0x0b, 0xe0, 0x8a, 37 0xd4, 0xce, 0xe1, 0x6a, 0x55, 0x1f, 0x8b, 0x17, 0x00, 0xe6, 0x69, 0xa3, 0x27, 38 0xe6, 0x08, 0x25, 0x69, 0x3c, 0x12, 0x9d, 0x8d, 0x05, 0x2c, 0xd6, 0x2e, 0xa2, 39 0x31, 0xde, 0xb4, 0x52, 0x50, 0xd6, 0x20, 0x49, 0xde, 0x71, 0xa0, 0xf9, 0xad, 40 0x20, 0x40, 0x12, 0xf1, 0xdd, 0x25, 0xeb, 0xd5, 0xe6, 0xb8, 0x36, 0xf4, 0xd6, 41 0x8f, 0x7f, 0xca, 0x43, 0xdc, 0xd7, 0x10, 0x5b, 0xe6, 0x3f, 0x51, 0x8a, 0x85, 42 0xb3, 0xf3, 0xff, 0xf6, 0x03, 0x2d, 0xcb, 0x23, 0x4f, 0x9c, 0xad, 0x18, 0xe7, 43 0x93, 0x05, 0x8c, 0xac, 0x52, 0x9a, 0xf7, 0x4c, 0xe9, 0x99, 0x7a, 0xbe, 0x6e, 44 0x7e, 0x4d, 0x0a, 0xe3, 0xc6, 0x1c, 0xa9, 0x93, 0xfa, 0x3a, 0xa5, 0x91, 0x5d, 45 0x1c, 0xbd, 0x66, 0xeb, 0xcc, 0x60, 0xdc, 0x86, 0x74, 0xca, 0xcf, 0xf8, 0x92, 46 0x1c, 0x98, 0x7d, 0x57, 0xfa, 0x61, 0x47, 0x9e, 0xab, 0x80, 0xb7, 0xe4, 0x48, 47 0x80, 0x2a, 0x92, 0xc5, 0x1b, 0x02, 0x03, 0x01, 0x00, 0x01 }; 48 49namespace { 50 51// Parses |pem_data| for a PEM block of |pem_type|. 52// Returns true if a |pem_type| block is found, storing the decoded result in 53// |der_output|. 54bool GetDERFromPEM(const std::string& pem_data, 55 const std::string& pem_type, 56 std::string* der_output) { 57 std::vector<std::string> headers; 58 headers.push_back(pem_type); 59 net::PEMTokenizer pem_tok(pem_data, headers); 60 if (!pem_tok.GetNext()) { 61 return false; 62 } 63 64 *der_output = pem_tok.data(); 65 return true; 66} 67 68} // namespace 69 70NetworkingPrivateCrypto::NetworkingPrivateCrypto() {} 71 72NetworkingPrivateCrypto::~NetworkingPrivateCrypto() {} 73 74bool NetworkingPrivateCrypto::VerifyCredentials( 75 const std::string& certificate, 76 const std::string& signature, 77 const std::string& data, 78 const std::string& connected_mac) { 79 crypto::EnsureNSSInit(); 80 81 std::string cert_data; 82 if (!GetDERFromPEM(certificate, "CERTIFICATE", &cert_data)) { 83 LOG(ERROR) << "Failed to parse certificate."; 84 return false; 85 } 86 SECItem der_cert; 87 der_cert.type = siDERCertBuffer; 88 der_cert.data = reinterpret_cast<unsigned char*>( 89 const_cast<char*>(cert_data.c_str())); 90 der_cert.len = cert_data.length(); 91 92 // Parse into a certificate structure. 93 typedef scoped_ptr_malloc< 94 CERTCertificate, 95 crypto::NSSDestroyer<CERTCertificate, 96 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 = const_cast<unsigned char*>( 109 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 = reinterpret_cast<unsigned char*>( 147 const_cast<char*>(signature.c_str())); 148 signature_item.len = static_cast<unsigned int>(signature.size()); 149 verified = VFY_VerifyDataDirect(reinterpret_cast<unsigned char*>( 150 const_cast<char*>(data.c_str())), data.size(), 151 public_key.get(), &signature_item, SEC_OID_PKCS1_RSA_ENCRYPTION, 152 SEC_OID_SHA1, NULL, NULL); 153 if (verified != SECSuccess) { 154 LOG(ERROR) << "Signed blobs did not match."; 155 return false; 156 } 157 return true; 158} 159 160bool NetworkingPrivateCrypto::EncryptByteString(const std::string& pub_key_der, 161 const std::string& data, 162 std::string* encrypted_output) { 163 crypto::EnsureNSSInit(); 164 165 SECItem pub_key_der_item; 166 pub_key_der_item.type = siDERCertBuffer; 167 pub_key_der_item.data = reinterpret_cast<unsigned char*>( 168 const_cast<char*>(pub_key_der.c_str())); 169 pub_key_der_item.len = pub_key_der.size(); 170 171 crypto::ScopedSECKEYPublicKey public_key(SECKEY_ImportDERPublicKey( 172 &pub_key_der_item, CKK_RSA)); 173 if (!public_key.get()) { 174 LOG(ERROR) << "Failed to parse public key."; 175 return false; 176 } 177 178 size_t encrypted_length = SECKEY_PublicKeyStrength(public_key.get()); 179 // RSAES is defined as operating on messages up to a length of k - 11, where 180 // k is the octet length of the RSA modulus. 181 if (encrypted_length < data.size() + 11) { 182 LOG(ERROR) << "Too much data to encrypt."; 183 return false; 184 } 185 186 scoped_ptr<unsigned char[]> rsa_output(new unsigned char[encrypted_length]); 187 SECStatus encrypted = PK11_PubEncryptPKCS1( 188 public_key.get(), 189 rsa_output.get(), 190 reinterpret_cast<unsigned char*>(const_cast<char*>(data.data())), 191 data.length(), 192 NULL); 193 if (encrypted != SECSuccess) { 194 LOG(ERROR) << "Error during encryption."; 195 return false; 196 } 197 encrypted_output->assign(reinterpret_cast<char*>(rsa_output.get()), 198 encrypted_length); 199 return true; 200} 201 202bool NetworkingPrivateCrypto::DecryptByteString( 203 const std::string& private_key_pem, 204 const std::string& encrypted_data, 205 std::string* decrypted_output) { 206 crypto::EnsureNSSInit(); 207 208 std::string private_key_der; 209 if (!GetDERFromPEM(private_key_pem, "PRIVATE KEY", &private_key_der)) { 210 LOG(ERROR) << "Failed to parse private key PEM."; 211 return false; 212 } 213 std::vector<uint8> private_key_data(private_key_der.begin(), 214 private_key_der.end()); 215 scoped_ptr<crypto::RSAPrivateKey> private_key( 216 crypto::RSAPrivateKey::CreateFromPrivateKeyInfo(private_key_data)); 217 if (!private_key || !private_key->public_key()) { 218 LOG(ERROR) << "Failed to parse private key DER."; 219 return false; 220 } 221 222 size_t encrypted_length = SECKEY_SignatureLen(private_key->public_key()); 223 scoped_ptr<unsigned char[]> rsa_output(new unsigned char[encrypted_length]); 224 unsigned int output_length = 0; 225 SECStatus decrypted = 226 PK11_PrivDecryptPKCS1(private_key->key(), 227 rsa_output.get(), 228 &output_length, 229 encrypted_length, 230 reinterpret_cast<unsigned char*>( 231 const_cast<char*>(encrypted_data.data())), 232 encrypted_data.length()); 233 if (decrypted != SECSuccess) { 234 LOG(ERROR) << "Error during decryption."; 235 return false; 236 } 237 decrypted_output->assign(reinterpret_cast<char*>(rsa_output.get()), 238 output_length); 239 return true; 240} 241 242