Certificate Transparency: Code for unpacking EV cert hashes whitelist

net/socket/ssl_client_socket_openssl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // OpenSSL binding for SSLClientSocket. The class layout and general principle
 // of operation is derived from SSLClientSocketNSS.
 
 #include "net/socket/ssl_client_socket_openssl.h"
 
 #include <errno.h>
 #include <openssl/bio.h>
 #include <openssl/err.h>
 #include <openssl/ssl.h>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/environment.h"
 #include "base/memory/singleton.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_piece.h"
 #include "base/synchronization/lock.h"
 #include "crypto/ec_private_key.h"
 #include "crypto/openssl_util.h"
 #include "crypto/scoped_openssl_types.h"
 #include "net/base/net_errors.h"
 #include "net/cert/cert_verifier.h"
+#include "net/cert/ct_ev_whitelist.h"
 #include "net/cert/ct_verifier.h"
 #include "net/cert/single_request_cert_verifier.h"
 #include "net/cert/x509_certificate_net_log_param.h"
 #include "net/cert/x509_util_openssl.h"
 #include "net/http/transport_security_state.h"
 #include "net/socket/ssl_session_cache_openssl.h"
 #include "net/ssl/openssl_ssl_util.h"
 #include "net/ssl/ssl_cert_request_info.h"
 #include "net/ssl/ssl_connection_status_flags.h"
 #include "net/ssl/ssl_info.h"
@@ skipping 1059 matching lines @@
       (result == OK ||
        (IsCertificateError(result) && IsCertStatusMinorError(cert_status))) &&
       !transport_security_state_->CheckPublicKeyPins(
           host_and_port_.host(),
           server_cert_verify_result_.is_issued_by_known_root,
           server_cert_verify_result_.public_key_hashes,
           &pinning_failure_log_)) {
     result = ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN;
   }
 
+  scoped_refptr<ct::EVCertsWhitelist> ev_whitelist =
+      SSLConfigService::GetEVCertsWhitelist();
+  if (server_cert_verify_result_.cert_status & CERT_STATUS_IS_EV) {
+    if (ev_whitelist.get() && ev_whitelist->IsValid()) {
+      const SHA256HashValue fingerprint(
+          X509Certificate::CalculateFingerprint256(
+              server_cert_verify_result_.verified_cert->os_cert_handle()));
+
+      UMA_HISTOGRAM_BOOLEAN(
+          "Net.SSL_EVCertificateInWhitelist",
+          ev_whitelist->ContainsCertificateHash(
+              std::string(reinterpret_cast<const char*>(fingerprint.data), 8)));
+    }
+  }
+
   if (result == OK) {
     // Only check Certificate Transparency if there were no other errors with
     // the connection.
     VerifyCT();
 
     // TODO(joth): Work out if we need to remember the intermediate CA certs
     // when the server sends them to us, and do so here.
     SSLContext::GetInstance()->session_cache()->MarkSSLSessionAsGood(ssl_);
     marked_session_as_good_ = true;
     CheckIfHandshakeFinished();
@@ skipping 664 matching lines @@
                                             ct::SCT_STATUS_LOG_UNKNOWN));
   }
 }
 
 scoped_refptr<X509Certificate>
 SSLClientSocketOpenSSL::GetUnverifiedServerCertificateChain() const {
   return server_cert_;
 }
 
 }  // namespace net