/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef NSSCertDBTrustDomain_h
#define NSSCertDBTrustDomain_h

#include "CertVerifier.h"
#include "ScopedNSSTypes.h"
#include "mozilla/BasePrincipal.h"
#include "nsICertBlocklist.h"
#include "nsString.h"
#include "pkix/pkixtypes.h"
#include "secmodt.h"

namespace mozilla { namespace psm {

enum class ValidityCheckingMode {
  CheckingOff = 0,
  CheckForEV = 1,
};

// Policy options for matching id-Netscape-stepUp with id-kp-serverAuth (for CA
// certificates only):
// * Always match: the step-up OID is considered equivalent to serverAuth
// * Match before 23 August 2016: the OID is considered equivalent if the
//   certificate's notBefore is before 23 August 2016
// * Match before 23 August 2015: similarly, but for 23 August 2015
// * Never match: the OID is never considered equivalent to serverAuth
enum class NetscapeStepUpPolicy : uint32_t {
  AlwaysMatch = 0,
  MatchBefore23August2016 = 1,
  MatchBefore23August2015 = 2,
  NeverMatch = 3,
};

SECStatus InitializeNSS(const nsACString& dir, bool readOnly,
                        bool loadPKCS11Modules);

void DisableMD5();

extern const char BUILTIN_ROOTS_MODULE_DEFAULT_NAME[];

// The dir parameter is the path to the directory containing the NSS builtin
// roots module. Usually this is the same as the path to the other NSS shared
// libraries. If it is null then the (library) path will be searched.
//
// The modNameUTF8 parameter should usually be
// BUILTIN_ROOTS_MODULE_DEFAULT_NAME.
SECStatus LoadLoadableRoots(/*optional*/ const char* dir,
                            const char* modNameUTF8);

void UnloadLoadableRoots(const char* modNameUTF8);

nsresult DefaultServerNicknameForCert(const CERTCertificate* cert,
                              /*out*/ nsCString& nickname);

void SaveIntermediateCerts(const UniqueCERTCertList& certList);

class NSSCertDBTrustDomain : public mozilla::pkix::TrustDomain
{

public:
  typedef mozilla::pkix::Result Result;

  enum OCSPFetching {
    NeverFetchOCSP = 0,
    FetchOCSPForDVSoftFail = 1,
    FetchOCSPForDVHardFail = 2,
    FetchOCSPForEV = 3,
    LocalOnlyOCSPForEV = 4,
  };

  NSSCertDBTrustDomain(SECTrustType certDBTrustType, OCSPFetching ocspFetching,
                       OCSPCache& ocspCache, void* pinArg,
                       CertVerifier::OcspGetConfig ocspGETConfig,
                       uint32_t certShortLifetimeInDays,
                       unsigned int minRSABits,
                       ValidityCheckingMode validityCheckingMode,
                       CertVerifier::SHA1Mode sha1Mode,
                       NetscapeStepUpPolicy netscapeStepUpPolicy,
                       const NeckoOriginAttributes& originAttributes,
                       UniqueCERTCertList& builtChain);

  virtual Result FindIssuer(mozilla::pkix::Input encodedIssuerName,
                            IssuerChecker& checker,
                            mozilla::pkix::Time time) override;

  virtual Result GetCertTrust(mozilla::pkix::EndEntityOrCA endEntityOrCA,
                              const mozilla::pkix::CertPolicyId& policy,
                              mozilla::pkix::Input candidateCertDER,
                              /*out*/ mozilla::pkix::TrustLevel& trustLevel)
                              override;

  virtual Result CheckSignatureDigestAlgorithm(
                   mozilla::pkix::DigestAlgorithm digestAlg,
                   mozilla::pkix::EndEntityOrCA endEntityOrCA,
                   mozilla::pkix::Time notBefore) override;

  virtual Result CheckRSAPublicKeyModulusSizeInBits(
                   mozilla::pkix::EndEntityOrCA endEntityOrCA,
                   unsigned int modulusSizeInBits) override;

  virtual Result VerifyRSAPKCS1SignedDigest(
                   const mozilla::pkix::SignedDigest& signedDigest,
                   mozilla::pkix::Input subjectPublicKeyInfo) override;

  virtual Result CheckECDSACurveIsAcceptable(
                   mozilla::pkix::EndEntityOrCA endEntityOrCA,
                   mozilla::pkix::NamedCurve curve) override;

  virtual Result VerifyECDSASignedDigest(
                   const mozilla::pkix::SignedDigest& signedDigest,
                   mozilla::pkix::Input subjectPublicKeyInfo) override;

  virtual Result DigestBuf(mozilla::pkix::Input item,
                           mozilla::pkix::DigestAlgorithm digestAlg,
                           /*out*/ uint8_t* digestBuf,
                           size_t digestBufLen) override;

  virtual Result CheckValidityIsAcceptable(
                   mozilla::pkix::Time notBefore, mozilla::pkix::Time notAfter,
                   mozilla::pkix::EndEntityOrCA endEntityOrCA,
                   mozilla::pkix::KeyPurposeId keyPurpose) override;

  virtual Result NetscapeStepUpMatchesServerAuth(
                   mozilla::pkix::Time notBefore,
                   /*out*/ bool& matches) override;

  virtual Result CheckRevocation(
                   mozilla::pkix::EndEntityOrCA endEntityOrCA,
                   const mozilla::pkix::CertID& certID,
                   mozilla::pkix::Time time,
                   mozilla::pkix::Duration validityDuration,
      /*optional*/ const mozilla::pkix::Input* stapledOCSPResponse,
      /*optional*/ const mozilla::pkix::Input* aiaExtension)
                   override;

  virtual Result IsChainValid(const mozilla::pkix::DERArray& certChain,
                              mozilla::pkix::Time time) override;

  virtual void NoteAuxiliaryExtension(
                   mozilla::pkix::AuxiliaryExtension extension,
                   mozilla::pkix::Input extensionData) override;

  // Resets the OCSP stapling status and SCT lists accumulated during
  // the chain building.
  void ResetAccumulatedState();

  CertVerifier::OCSPStaplingStatus GetOCSPStaplingStatus() const
  {
    return mOCSPStaplingStatus;
  }

  // SCT lists (see Certificate Transparency) extracted during
  // certificate verification. Note that the returned Inputs are invalidated
  // the next time a chain is built and by ResetAccumulatedState method
  // (and when the TrustDomain object is destroyed).

  mozilla::pkix::Input GetSCTListFromCertificate() const;
  mozilla::pkix::Input GetSCTListFromOCSPStapling() const;

private:
  enum EncodedResponseSource {
    ResponseIsFromNetwork = 1,
    ResponseWasStapled = 2
  };
  Result VerifyAndMaybeCacheEncodedOCSPResponse(
    const mozilla::pkix::CertID& certID, mozilla::pkix::Time time,
    uint16_t maxLifetimeInDays, mozilla::pkix::Input encodedResponse,
    EncodedResponseSource responseSource, /*out*/ bool& expired);

  const SECTrustType mCertDBTrustType;
  const OCSPFetching mOCSPFetching;
  OCSPCache& mOCSPCache; // non-owning!
  void* mPinArg; // non-owning!
  const CertVerifier::OcspGetConfig mOCSPGetConfig;
  const uint32_t mCertShortLifetimeInDays;
  const unsigned int mMinRSABits;
  ValidityCheckingMode mValidityCheckingMode;
  CertVerifier::SHA1Mode mSHA1Mode;
  NetscapeStepUpPolicy mNetscapeStepUpPolicy;
  const NeckoOriginAttributes& mOriginAttributes;
  UniqueCERTCertList& mBuiltChain; // non-owning
  nsCOMPtr<nsICertBlocklist> mCertBlocklist;
  CertVerifier::OCSPStaplingStatus mOCSPStaplingStatus;
  // Certificate Transparency data extracted during certificate verification
  UniqueSECItem mSCTListFromCertificate;
  UniqueSECItem mSCTListFromOCSPStapling;
};

} } // namespace mozilla::psm

#endif // NSSCertDBTrustDomain_h