Certificate Transparency: Add the high-level interface for verifying SCTs over multiple logs

net/cert/multi_log_ct_verifier.h

+// Copyright 2013 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.
+
+#ifndef NET_CERT_MULTI_LOG_CT_VERIFIER_H_
+#define NET_CERT_MULTI_LOG_CT_VERIFIER_H_
+
+#include <map>
+#include <string>
+
+#include "base/memory/linked_ptr.h"
+#include "base/memory/scoped_ptr.h"
+#include "net/base/net_export.h"
+#include "net/cert/ct_verifier.h"
+#include "net/cert/signed_certificate_timestamp.h"
+
+namespace net {
+
+namespace ct {
+struct LogEntry;
+}  // namespace ct
+
+class CTLogVerifier;
+
+// A Certificate Transparency verifier that can verify Signed Certificate
+// Timestamps from multiple logs.
+// There should be a global instance of this class and for all known logs,
+// AddLog should be called with a CTLogVerifier (which is created from the
+// log's public key).
+class NET_EXPORT MultiLogCTVerifier : public CTVerifier {
+ public:
+  MultiLogCTVerifier();
+  virtual ~MultiLogCTVerifier();
+
+  void AddLog(scoped_ptr<CTLogVerifier> log_verifier);
+
+  // CTVerifier implementation:
+  virtual int Verify(X509Certificate* cert,
+                     const std::string& sct_list_from_ocsp,
+                     const std::string& sct_list_from_tls_extension,
+                     ct::CTVerifyResult* result) OVERRIDE;
+
+ private:
+  // Mapping from a log's ID to the verifier for this log.
+  // A log's ID is the SHA-256 of the log's key, as defined in section 3.2.
+  // of RFC6962.
+  typedef std::map<std::string, linked_ptr<CTLogVerifier> > IDToLogMap;
+
+  // Verify a list of SCTs from |encoded_sct_list| over |expected_entry|,
+  // placing the verification results in |result|. The SCTs in the list
+  // come from |origin| (as will be indicated in the origin field of each SCT).
+  bool VerifySCTs(const std::string& encoded_sct_list,
+                  const ct::LogEntry& expected_entry,
+                  ct::SignedCertificateTimestamp::Origin origin,
+                  ct::CTVerifyResult* result);
+
+  // Verifies a single, parsed SCT against all logs.
+  bool VerifySingleSCT(
+      scoped_refptr<ct::SignedCertificateTimestamp> sct,
+      const ct::LogEntry& expected_entry,
+      ct::CTVerifyResult* result);
+
+  IDToLogMap logs_;
+
+  DISALLOW_COPY_AND_ASSIGN(MultiLogCTVerifier);
+};
+
+}  // namespace net
+
+#endif  // NET_CERT_MULTI_LOG_CT_VERIFIER_H_