net/cert/x509_util_nss.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/x509_util.h"
   6 #include "net/cert/x509_util_nss.h"
   7
   8 #include <cert.h>  // Must be included before certdb.h
   9 #include <certdb.h>
  10 #include <cryptohi.h>
  11 #include <nss.h>
  12 #include <pk11pub.h>
  13 #include <prerror.h>
  14 #include <secder.h>
  15 #include <secmod.h>
  16 #include <secport.h>
  17
  18 #include "base/debug/leak_annotations.h"
  19 #include "base/logging.h"
  20 #include "base/memory/scoped_ptr.h"
  21 #include "base/memory/singleton.h"
  22 #include "base/pickle.h"
  23 #include "base/strings/stringprintf.h"
  24 #include "crypto/ec_private_key.h"
  25 #include "crypto/nss_util.h"
  26 #include "crypto/nss_util_internal.h"
  27 #include "crypto/rsa_private_key.h"
  28 #include "crypto/scoped_nss_types.h"
  29 #include "crypto/third_party/nss/chromium-nss.h"
  30 #include "net/cert/x509_certificate.h"
  31
  32 namespace net {
  33
  34 namespace {
  35
  36 class ChannelIDOIDWrapper {
  37  public:
  38   static ChannelIDOIDWrapper* GetInstance() {
  39     // Instantiated as a leaky singleton to allow the singleton to be
  40     // constructed on a worker thead that is not joined when a process
  41     // shuts down.
  42     return Singleton<ChannelIDOIDWrapper,
  43                      LeakySingletonTraits<ChannelIDOIDWrapper> >::get();
  44   }
  45
  46   SECOidTag domain_bound_cert_oid_tag() const {
  47     return domain_bound_cert_oid_tag_;
  48   }
  49
  50  private:
  51   friend struct DefaultSingletonTraits<ChannelIDOIDWrapper>;
  52
  53   ChannelIDOIDWrapper();
  54
  55   SECOidTag domain_bound_cert_oid_tag_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(ChannelIDOIDWrapper);
  58 };
  59
  60 ChannelIDOIDWrapper::ChannelIDOIDWrapper()
  61     : domain_bound_cert_oid_tag_(SEC_OID_UNKNOWN) {
  62   // 1.3.6.1.4.1.11129.2.1.6
  63   // (iso.org.dod.internet.private.enterprises.google.googleSecurity.
  64   //  certificateExtensions.originBoundCertificate)
  65   static const uint8 kObCertOID[] = {
  66     0x2b, 0x06, 0x01, 0x04, 0x01, 0xd6, 0x79, 0x02, 0x01, 0x06
  67   };
  68   SECOidData oid_data;
  69   memset(&oid_data, 0, sizeof(oid_data));
  70   oid_data.oid.data = const_cast<uint8*>(kObCertOID);
  71   oid_data.oid.len = sizeof(kObCertOID);
  72   oid_data.offset = SEC_OID_UNKNOWN;
  73   oid_data.desc = "Origin Bound Certificate";
  74   oid_data.mechanism = CKM_INVALID_MECHANISM;
  75   oid_data.supportedExtension = SUPPORTED_CERT_EXTENSION;
  76   domain_bound_cert_oid_tag_ = SECOID_AddEntry(&oid_data);
  77   if (domain_bound_cert_oid_tag_ == SEC_OID_UNKNOWN)
  78     LOG(ERROR) << "OB_CERT OID tag creation failed";
  79 }
  80
  81 // Creates a Certificate object that may be passed to the SignCertificate
  82 // method to generate an X509 certificate.
  83 // Returns NULL if an error is encountered in the certificate creation
  84 // process.
  85 // Caller responsible for freeing returned certificate object.
  86 CERTCertificate* CreateCertificate(
  87     SECKEYPublicKey* public_key,
  88     const std::string& subject,
  89     uint32 serial_number,
  90     base::Time not_valid_before,
  91     base::Time not_valid_after) {
  92   // Create info about public key.
  93   CERTSubjectPublicKeyInfo* spki =
  94       SECKEY_CreateSubjectPublicKeyInfo(public_key);
  95   if (!spki)
  96     return NULL;
  97
  98   // Create the certificate request.
  99   CERTName* subject_name =
 100       CERT_AsciiToName(const_cast<char*>(subject.c_str()));
 101   CERTCertificateRequest* cert_request =
 102       CERT_CreateCertificateRequest(subject_name, spki, NULL);
 103   SECKEY_DestroySubjectPublicKeyInfo(spki);
 104
 105   if (!cert_request) {
 106     PRErrorCode prerr = PR_GetError();
 107     LOG(ERROR) << "Failed to create certificate request: " << prerr;
 108     CERT_DestroyName(subject_name);
 109     return NULL;
 110   }
 111
 112   CERTValidity* validity = CERT_CreateValidity(
 113       crypto::BaseTimeToPRTime(not_valid_before),
 114       crypto::BaseTimeToPRTime(not_valid_after));
 115   if (!validity) {
 116     PRErrorCode prerr = PR_GetError();
 117     LOG(ERROR) << "Failed to create certificate validity object: " << prerr;
 118     CERT_DestroyName(subject_name);
 119     CERT_DestroyCertificateRequest(cert_request);
 120     return NULL;
 121   }
 122   CERTCertificate* cert = CERT_CreateCertificate(serial_number, subject_name,
 123                                                  validity, cert_request);
 124   if (!cert) {
 125     PRErrorCode prerr = PR_GetError();
 126     LOG(ERROR) << "Failed to create certificate: " << prerr;
 127   }
 128
 129   // Cleanup for resources used to generate the cert.
 130   CERT_DestroyName(subject_name);
 131   CERT_DestroyValidity(validity);
 132   CERT_DestroyCertificateRequest(cert_request);
 133
 134   return cert;
 135 }
 136
 137 SECOidTag ToSECOid(x509_util::DigestAlgorithm alg) {
 138   switch (alg) {
 139     case x509_util::DIGEST_SHA1:
 140       return SEC_OID_SHA1;
 141     case x509_util::DIGEST_SHA256:
 142       return SEC_OID_SHA256;
 143   }
 144   return SEC_OID_UNKNOWN;
 145 }
 146
 147 // Signs a certificate object, with |key| generating a new X509Certificate
 148 // and destroying the passed certificate object (even when NULL is returned).
 149 // The logic of this method references SignCert() in NSS utility certutil:
 150 // http://mxr.mozilla.org/security/ident?i=SignCert.
 151 // Returns true on success or false if an error is encountered in the
 152 // certificate signing process.
 153 bool SignCertificate(
 154     CERTCertificate* cert,
 155     SECKEYPrivateKey* key,
 156     SECOidTag hash_algorithm) {
 157   // |arena| is used to encode the cert.
 158   PLArenaPool* arena = cert->arena;
 159   SECOidTag algo_id = SEC_GetSignatureAlgorithmOidTag(key->keyType,
 160                                                       hash_algorithm);
 161   if (algo_id == SEC_OID_UNKNOWN)
 162     return false;
 163
 164   SECStatus rv = SECOID_SetAlgorithmID(arena, &cert->signature, algo_id, 0);
 165   if (rv != SECSuccess)
 166     return false;
 167
 168   // Generate a cert of version 3.
 169   *(cert->version.data) = 2;
 170   cert->version.len = 1;
 171
 172   SECItem der = { siBuffer, NULL, 0 };
 173
 174   // Use ASN1 DER to encode the cert.
 175   void* encode_result = SEC_ASN1EncodeItem(
 176       NULL, &der, cert, SEC_ASN1_GET(CERT_CertificateTemplate));
 177   if (!encode_result)
 178     return false;
 179
 180   // Allocate space to contain the signed cert.
 181   SECItem result = { siBuffer, NULL, 0 };
 182
 183   // Sign the ASN1 encoded cert and save it to |result|.
 184   rv = DerSignData(arena, &result, &der, key, algo_id);
 185   PORT_Free(der.data);
 186   if (rv != SECSuccess) {
 187     DLOG(ERROR) << "DerSignData: " << PORT_GetError();
 188     return false;
 189   }
 190
 191   // Save the signed result to the cert.
 192   cert->derCert = result;
 193
 194   return true;
 195 }
 196
 197 }  // namespace
 198
 199 namespace x509_util {
 200
 201 bool CreateSelfSignedCert(crypto::RSAPrivateKey* key,
 202                           DigestAlgorithm alg,
 203                           const std::string& subject,
 204                           uint32 serial_number,
 205                           base::Time not_valid_before,
 206                           base::Time not_valid_after,
 207                           std::string* der_cert) {
 208   DCHECK(key);
 209   DCHECK(!strncmp(subject.c_str(), "CN=", 3U));
 210   CERTCertificate* cert = CreateCertificate(key->public_key(),
 211                                             subject,
 212                                             serial_number,
 213                                             not_valid_before,
 214                                             not_valid_after);
 215   if (!cert)
 216     return false;
 217
 218   if (!SignCertificate(cert, key->key(), ToSECOid(alg))) {
 219     CERT_DestroyCertificate(cert);
 220     return false;
 221   }
 222
 223   der_cert->assign(reinterpret_cast<char*>(cert->derCert.data),
 224                    cert->derCert.len);
 225   CERT_DestroyCertificate(cert);
 226   return true;
 227 }
 228
 229 bool IsSupportedValidityRange(base::Time not_valid_before,
 230                               base::Time not_valid_after) {
 231   CERTValidity* validity = CERT_CreateValidity(
 232       crypto::BaseTimeToPRTime(not_valid_before),
 233       crypto::BaseTimeToPRTime(not_valid_after));
 234
 235   if (!validity)
 236     return false;
 237
 238   CERT_DestroyValidity(validity);
 239   return true;
 240 }
 241
 242 bool CreateChannelIDEC(crypto::ECPrivateKey* key,
 243                        DigestAlgorithm alg,
 244                        const std::string& domain,
 245                        uint32 serial_number,
 246                        base::Time not_valid_before,
 247                        base::Time not_valid_after,
 248                        std::string* der_cert) {
 249   DCHECK(key);
 250
 251   CERTCertificate* cert = CreateCertificate(key->public_key(),
 252                                             "CN=anonymous.invalid",
 253                                             serial_number,
 254                                             not_valid_before,
 255                                             not_valid_after);
 256
 257   if (!cert)
 258     return false;
 259
 260   // Create opaque handle used to add extensions later.
 261   void* cert_handle;
 262   if ((cert_handle = CERT_StartCertExtensions(cert)) == NULL) {
 263     LOG(ERROR) << "Unable to get opaque handle for adding extensions";
 264     CERT_DestroyCertificate(cert);
 265     return false;
 266   }
 267
 268   // Create SECItem for IA5String encoding.
 269   SECItem domain_string_item = {
 270     siAsciiString,
 271     (unsigned char*)domain.data(),
 272     static_cast<unsigned>(domain.size())
 273   };
 274
 275   // IA5Encode and arena allocate SECItem
 276   SECItem* asn1_domain_string = SEC_ASN1EncodeItem(
 277       cert->arena, NULL, &domain_string_item,
 278       SEC_ASN1_GET(SEC_IA5StringTemplate));
 279   if (asn1_domain_string == NULL) {
 280     LOG(ERROR) << "Unable to get ASN1 encoding for domain in domain_bound_cert"
 281                   " extension";
 282     CERT_DestroyCertificate(cert);
 283     return false;
 284   }
 285
 286   // Add the extension to the opaque handle
 287   if (CERT_AddExtension(
 288       cert_handle,
 289       ChannelIDOIDWrapper::GetInstance()->domain_bound_cert_oid_tag(),
 290       asn1_domain_string,
 291       PR_TRUE,
 292       PR_TRUE) != SECSuccess){
 293     LOG(ERROR) << "Unable to add domain bound cert extension to opaque handle";
 294     CERT_DestroyCertificate(cert);
 295     return false;
 296   }
 297
 298   // Copy extension into x509 cert
 299   if (CERT_FinishExtensions(cert_handle) != SECSuccess){
 300     LOG(ERROR) << "Unable to copy extension to X509 cert";
 301     CERT_DestroyCertificate(cert);
 302     return false;
 303   }
 304
 305   if (!SignCertificate(cert, key->key(), ToSECOid(alg))) {
 306     CERT_DestroyCertificate(cert);
 307     return false;
 308   }
 309
 310   DCHECK(cert->derCert.len);
 311   // XXX copied from X509Certificate::GetDEREncoded
 312   der_cert->clear();
 313   der_cert->append(reinterpret_cast<char*>(cert->derCert.data),
 314                    cert->derCert.len);
 315   CERT_DestroyCertificate(cert);
 316   return true;
 317 }
 318
 319 } // namespace x509_util
 320
 321 } // namespace net