security/ct/CTLogVerifier.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef CTLogVerifier_h
   8 #define CTLogVerifier_h
   9
  10 #include <memory>
  11
  12 #include "CTKnownLogs.h"
  13 #include "CTLog.h"
  14 #include "CTUtils.h"
  15 #include "SignedCertificateTimestamp.h"
  16 #include "mozpkix/Input.h"
  17 #include "mozpkix/Result.h"
  18 #include "mozpkix/pkix.h"
  19
  20 namespace mozilla {
  21 namespace ct {
  22
  23 // Verifies Signed Certificate Timestamps (SCTs) provided by a specific log
  24 // using the public key of that log. Assumes the SCT being verified
  25 // matches the log by log key ID and signature parameters (an error is returned
  26 // otherwise).
  27 // The verification functions return Success if the provided SCT has passed
  28 // verification, ERROR_BAD_SIGNATURE if failed verification, or other result
  29 // on error.
  30 class CTLogVerifier {
  31  public:
  32   // |operatorId| The numeric ID of the log operator.
  33   // |logState| "Qualified", "Usable", "ReadOnly", or "Retired".
  34   // |timestamp| timestamp associated with logState.
  35   CTLogVerifier(CTLogOperatorId operatorId, CTLogState logState,
  36                 uint64_t timestamp);
  37
  38   // Initializes the verifier with the given subjectPublicKeyInfo.
  39   // |subjectPublicKeyInfo| is a DER-encoded SubjectPublicKeyInfo.
  40   // An error is returned if |subjectPublicKeyInfo| refers to an unsupported
  41   // public key.
  42   pkix::Result Init(pkix::Input subjectPublicKeyInfo);
  43
  44   // Returns the log's key ID, which is a SHA256 hash of its public key.
  45   // See RFC 6962, Section 3.2.
  46   const Buffer& keyId() const { return mKeyId; }
  47
  48   CTLogOperatorId operatorId() const { return mOperatorId; }
  49   CTLogState state() const { return mState; }
  50   uint64_t timestamp() const { return mTimestamp; }
  51
  52   // Verifies that |sct| contains a valid signature for |entry|.
  53   // |sct| must be signed by the verifier's log.
  54   pkix::Result Verify(const LogEntry& entry,
  55                       const SignedCertificateTimestamp& sct);
  56
  57   // Returns true if the signature and hash algorithms in |signature|
  58   // match those of the log.
  59   bool SignatureParametersMatch(const DigitallySigned& signature);
  60
  61  private:
  62   // Performs the underlying verification using the log's public key. Note
  63   // that |signature| contains the raw signature data (i.e. without any
  64   // DigitallySigned struct encoding).
  65   // Returns Success if passed verification, ERROR_BAD_SIGNATURE if failed
  66   // verification, or other result on error.
  67   pkix::Result VerifySignature(pkix::Input data, pkix::Input signature);
  68   pkix::Result VerifySignature(const Buffer& data, const Buffer& signature);
  69
  70   // mPublicECKey works around an architectural deficiency in NSS. In the case
  71   // of EC, if we don't create, import, and cache this key, NSS will import and
  72   // verify it every signature verification, which is slow. For RSA, this is
  73   // unused and will be null.
  74   UniqueSECKEYPublicKey mPublicECKey;
  75   Buffer mSubjectPublicKeyInfo;
  76   Buffer mKeyId;
  77   DigitallySigned::SignatureAlgorithm mSignatureAlgorithm;
  78   CTLogOperatorId mOperatorId;
  79   CTLogState mState;
  80   uint64_t mTimestamp;
  81 };
  82
  83 }  // namespace ct
  84 }  // namespace mozilla
  85
  86 #endif  // CTLogVerifier_h