DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (fddffdeab170)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */

#include "NSSCertDBTrustDomain.h"

#include <stdint.h>

#include "ExtendedValidation.h"
#include "OCSPRequestor.h"
#include "OCSPVerificationTrustDomain.h"
#include "certdb.h"
#include "cert.h"
#include "mozilla/UniquePtr.h"
#include "nsNSSCertificate.h"
#include "nss.h"
#include "NSSErrorsService.h"
#include "nsServiceManagerUtils.h"
#include "pk11pub.h"
#include "pkix/pkix.h"
#include "pkix/pkixnss.h"
#include "prerror.h"
#include "prmem.h"
#include "prprf.h"
#include "PublicKeyPinningService.h"
#include "ScopedNSSTypes.h"
#include "secerr.h"

#include "CNNICHashWhitelist.inc"

using namespace mozilla;
using namespace mozilla::pkix;

extern PRLogModuleInfo* gCertVerifierLog;

static const uint64_t ServerFailureDelaySeconds = 5 * 60;

namespace mozilla { namespace psm {

const char BUILTIN_ROOTS_MODULE_DEFAULT_NAME[] = "Builtin Roots Module";

NSSCertDBTrustDomain::NSSCertDBTrustDomain(SECTrustType certDBTrustType,
                                           OCSPFetching ocspFetching,
                                           OCSPCache& ocspCache,
             /*optional but shouldn't be*/ void* pinArg,
                                           CertVerifier::OcspGetConfig ocspGETConfig,
                                           uint32_t certShortLifetimeInDays,
                                           CertVerifier::PinningMode pinningMode,
                                           unsigned int minRSABits,
                                           ValidityCheckingMode validityCheckingMode,
                                           SignatureDigestOption signatureDigestOption,
                                           CertVerifier::SHA1Mode sha1Mode,
                              /*optional*/ PinningTelemetryInfo* pinningTelemetryInfo,
                              /*optional*/ const char* hostname,
                              /*optional*/ ScopedCERTCertList* builtChain)
  : mCertDBTrustType(certDBTrustType)
  , mOCSPFetching(ocspFetching)
  , mOCSPCache(ocspCache)
  , mPinArg(pinArg)
  , mOCSPGetConfig(ocspGETConfig)
  , mCertShortLifetimeInDays(certShortLifetimeInDays)
  , mPinningMode(pinningMode)
  , mMinRSABits(minRSABits)
  , mValidityCheckingMode(validityCheckingMode)
  , mSignatureDigestOption(signatureDigestOption)
  , mSHA1Mode(sha1Mode)
  , mPinningTelemetryInfo(pinningTelemetryInfo)
  , mHostname(hostname)
  , mBuiltChain(builtChain)
  , mCertBlocklist(do_GetService(NS_CERTBLOCKLIST_CONTRACTID))
  , mOCSPStaplingStatus(CertVerifier::OCSP_STAPLING_NEVER_CHECKED)
{
}

// If useRoots is true, we only use root certificates in the candidate list.
// If useRoots is false, we only use non-root certificates in the list.
static Result
FindIssuerInner(ScopedCERTCertList& candidates, bool useRoots,
                Input encodedIssuerName, TrustDomain::IssuerChecker& checker,
                /*out*/ bool& keepGoing)
{
  keepGoing = true;
  for (CERTCertListNode* n = CERT_LIST_HEAD(candidates);
       !CERT_LIST_END(n, candidates); n = CERT_LIST_NEXT(n)) {
    bool candidateIsRoot = !!n->cert->isRoot;
    if (candidateIsRoot != useRoots) {
      continue;
    }
    Input certDER;
    Result rv = certDER.Init(n->cert->derCert.data, n->cert->derCert.len);
    if (rv != Success) {
      continue; // probably too big
    }

    const SECItem encodedIssuerNameItem = {
      siBuffer,
      const_cast<unsigned char*>(encodedIssuerName.UnsafeGetData()),
      encodedIssuerName.GetLength()
    };
    ScopedSECItem nameConstraints(::SECITEM_AllocItem(nullptr, nullptr, 0));
    SECStatus srv = CERT_GetImposedNameConstraints(&encodedIssuerNameItem,
                                                   nameConstraints.get());
    if (srv != SECSuccess) {
      if (PR_GetError() != SEC_ERROR_EXTENSION_NOT_FOUND) {
        return Result::FATAL_ERROR_LIBRARY_FAILURE;
      }

      // If no imposed name constraints were found, continue without them
      rv = checker.Check(certDER, nullptr, keepGoing);
    } else {
      // Otherwise apply the constraints
      Input nameConstraintsInput;
      if (nameConstraintsInput.Init(
              nameConstraints->data,
              nameConstraints->len) != Success) {
        return Result::FATAL_ERROR_LIBRARY_FAILURE;
      }
      rv = checker.Check(certDER, &nameConstraintsInput, keepGoing);
    }
    if (rv != Success) {
      return rv;
    }
    if (!keepGoing) {
      break;
    }
  }

  return Success;
}

Result
NSSCertDBTrustDomain::FindIssuer(Input encodedIssuerName,
                                 IssuerChecker& checker, Time)
{
  // TODO: NSS seems to be ambiguous between "no potential issuers found" and
  // "there was an error trying to retrieve the potential issuers."
  SECItem encodedIssuerNameItem = UnsafeMapInputToSECItem(encodedIssuerName);
  ScopedCERTCertList
    candidates(CERT_CreateSubjectCertList(nullptr, CERT_GetDefaultCertDB(),
                                          &encodedIssuerNameItem, 0,
                                          false));
  if (candidates) {
    // First, try all the root certs; then try all the non-root certs.
    bool keepGoing;
    Result rv = FindIssuerInner(candidates, true, encodedIssuerName, checker,
                                keepGoing);
    if (rv != Success) {
      return rv;
    }
    if (keepGoing) {
      rv = FindIssuerInner(candidates, false, encodedIssuerName, checker,
                           keepGoing);
      if (rv != Success) {
        return rv;
      }
    }
  }

  return Success;
}

Result
NSSCertDBTrustDomain::GetCertTrust(EndEntityOrCA endEntityOrCA,
                                   const CertPolicyId& policy,
                                   Input candidateCertDER,
                                   /*out*/ TrustLevel& trustLevel)
{
#ifdef MOZ_NO_EV_CERTS
  if (!policy.IsAnyPolicy()) {
    return Result::ERROR_POLICY_VALIDATION_FAILED;
  }
#endif

  // XXX: This would be cleaner and more efficient if we could get the trust
  // information without constructing a CERTCertificate here, but NSS doesn't
  // expose it in any other easy-to-use fashion. The use of
  // CERT_NewTempCertificate to get a CERTCertificate shouldn't be a
  // performance problem because NSS will just find the existing
  // CERTCertificate in its in-memory cache and return it.
  SECItem candidateCertDERSECItem = UnsafeMapInputToSECItem(candidateCertDER);
  ScopedCERTCertificate candidateCert(
    CERT_NewTempCertificate(CERT_GetDefaultCertDB(), &candidateCertDERSECItem,
                            nullptr, false, true));
  if (!candidateCert) {
    return MapPRErrorCodeToResult(PR_GetError());
  }

  // Check the certificate against the OneCRL cert blocklist
  if (!mCertBlocklist) {
    return Result::FATAL_ERROR_LIBRARY_FAILURE;
  }

  bool isCertRevoked;
  nsresult nsrv = mCertBlocklist->IsCertRevoked(
                    candidateCert->derIssuer.data,
                    candidateCert->derIssuer.len,
                    candidateCert->serialNumber.data,
                    candidateCert->serialNumber.len,
                    candidateCert->derSubject.data,
                    candidateCert->derSubject.len,
                    candidateCert->derPublicKey.data,
                    candidateCert->derPublicKey.len,
                    &isCertRevoked);
  if (NS_FAILED(nsrv)) {
    return Result::FATAL_ERROR_LIBRARY_FAILURE;
  }

  if (isCertRevoked) {
    MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
           ("NSSCertDBTrustDomain: certificate is in blocklist"));
    return Result::ERROR_REVOKED_CERTIFICATE;
  }

  // XXX: CERT_GetCertTrust seems to be abusing SECStatus as a boolean, where
  // SECSuccess means that there is a trust record and SECFailure means there
  // is not a trust record. I looked at NSS's internal uses of
  // CERT_GetCertTrust, and all that code uses the result as a boolean meaning
  // "We have a trust record."
  CERTCertTrust trust;
  if (CERT_GetCertTrust(candidateCert.get(), &trust) == SECSuccess) {
    uint32_t flags = SEC_GET_TRUST_FLAGS(&trust, mCertDBTrustType);

    // For DISTRUST, we use the CERTDB_TRUSTED or CERTDB_TRUSTED_CA bit,
    // because we can have active distrust for either type of cert. Note that
    // CERTDB_TERMINAL_RECORD means "stop trying to inherit trust" so if the
    // relevant trust bit isn't set then that means the cert must be considered
    // distrusted.
    uint32_t relevantTrustBit =
      endEntityOrCA == EndEntityOrCA::MustBeCA ? CERTDB_TRUSTED_CA
                                               : CERTDB_TRUSTED;
    if (((flags & (relevantTrustBit|CERTDB_TERMINAL_RECORD)))
            == CERTDB_TERMINAL_RECORD) {
      trustLevel = TrustLevel::ActivelyDistrusted;
      return Success;
    }

    // For TRUST, we only use the CERTDB_TRUSTED_CA bit, because Gecko hasn't
    // needed to consider end-entity certs to be their own trust anchors since
    // Gecko implemented nsICertOverrideService.
    if (flags & CERTDB_TRUSTED_CA) {
      if (policy.IsAnyPolicy()) {
        trustLevel = TrustLevel::TrustAnchor;
        return Success;
      }
#ifndef MOZ_NO_EV_CERTS
      if (CertIsAuthoritativeForEVPolicy(candidateCert.get(), policy)) {
        trustLevel = TrustLevel::TrustAnchor;
        return Success;
      }
#endif
    }
  }

  trustLevel = TrustLevel::InheritsTrust;
  return Success;
}

Result
NSSCertDBTrustDomain::DigestBuf(Input item, DigestAlgorithm digestAlg,
                                /*out*/ uint8_t* digestBuf, size_t digestBufLen)
{
  return DigestBufNSS(item, digestAlg, digestBuf, digestBufLen);
}


static PRIntervalTime
OCSPFetchingTypeToTimeoutTime(NSSCertDBTrustDomain::OCSPFetching ocspFetching)
{
  switch (ocspFetching) {
    case NSSCertDBTrustDomain::FetchOCSPForDVSoftFail:
      return PR_SecondsToInterval(2);
    case NSSCertDBTrustDomain::FetchOCSPForEV:
    case NSSCertDBTrustDomain::FetchOCSPForDVHardFail:
      return PR_SecondsToInterval(10);
    // The rest of these are error cases. Assert in debug builds, but return
    // the default value corresponding to 2 seconds in release builds.
    case NSSCertDBTrustDomain::NeverFetchOCSP:
    case NSSCertDBTrustDomain::LocalOnlyOCSPForEV:
      PR_NOT_REACHED("we should never see this OCSPFetching type here");
    default:
      PR_NOT_REACHED("we're not handling every OCSPFetching type");
  }
  return PR_SecondsToInterval(2);
}

// Copied and modified from CERT_GetOCSPAuthorityInfoAccessLocation and
// CERT_GetGeneralNameByType. Returns SECFailure on error, SECSuccess
// with url == nullptr when an OCSP URI was not found, and SECSuccess with
// url != nullptr when an OCSP URI was found. The output url will be owned
// by the arena.
static Result
GetOCSPAuthorityInfoAccessLocation(PLArenaPool* arena,
                                   Input aiaExtension,
                                   /*out*/ char const*& url)
{
  url = nullptr;
  SECItem aiaExtensionSECItem = UnsafeMapInputToSECItem(aiaExtension);
  CERTAuthInfoAccess** aia =
    CERT_DecodeAuthInfoAccessExtension(arena, &aiaExtensionSECItem);
  if (!aia) {
    return Result::ERROR_CERT_BAD_ACCESS_LOCATION;
  }
  for (size_t i = 0; aia[i]; ++i) {
    if (SECOID_FindOIDTag(&aia[i]->method) == SEC_OID_PKIX_OCSP) {
      // NSS chooses the **last** OCSP URL; we choose the **first**
      CERTGeneralName* current = aia[i]->location;
      if (!current) {
        continue;
      }
      do {
        if (current->type == certURI) {
          const SECItem& location = current->name.other;
          // (location.len + 1) must be small enough to fit into a uint32_t,
          // but we limit it to a smaller bound to reduce OOM risk.
          if (location.len > 1024 || memchr(location.data, 0, location.len)) {
            // Reject embedded nulls. (NSS doesn't do this)
            return Result::ERROR_CERT_BAD_ACCESS_LOCATION;
          }
          // Copy the non-null-terminated SECItem into a null-terminated string.
          char* nullTerminatedURL(static_cast<char*>(
                                    PORT_ArenaAlloc(arena, location.len + 1)));
          if (!nullTerminatedURL) {
            return Result::FATAL_ERROR_NO_MEMORY;
          }
          memcpy(nullTerminatedURL, location.data, location.len);
          nullTerminatedURL[location.len] = 0;
          url = nullTerminatedURL;
          return Success;
        }
        current = CERT_GetNextGeneralName(current);
      } while (current != aia[i]->location);
    }
  }

  return Success;
}

Result
NSSCertDBTrustDomain::CheckRevocation(EndEntityOrCA endEntityOrCA,
                                      const CertID& certID, Time time,
                                      Duration validityDuration,
                         /*optional*/ const Input* stapledOCSPResponse,
                         /*optional*/ const Input* aiaExtension)
{
  // Actively distrusted certificates will have already been blocked by
  // GetCertTrust.

  // TODO: need to verify that IsRevoked isn't called for trust anchors AND
  // that that fact is documented in mozillapkix.

  MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
         ("NSSCertDBTrustDomain: Top of CheckRevocation\n"));

  // Bug 991815: The BR allow OCSP for intermediates to be up to one year old.
  // Since this affects EV there is no reason why DV should be more strict
  // so all intermediatates are allowed to have OCSP responses up to one year
  // old.
  uint16_t maxOCSPLifetimeInDays = 10;
  if (endEntityOrCA == EndEntityOrCA::MustBeCA) {
    maxOCSPLifetimeInDays = 365;
  }

  // If we have a stapled OCSP response then the verification of that response
  // determines the result unless the OCSP response is expired. We make an
  // exception for expired responses because some servers, nginx in particular,
  // are known to serve expired responses due to bugs.
  // We keep track of the result of verifying the stapled response but don't
  // immediately return failure if the response has expired.
  //
  // We only set the OCSP stapling status if we're validating the end-entity
  // certificate. Non-end-entity certificates would always be
  // OCSP_STAPLING_NONE unless/until we implement multi-stapling.
  Result stapledOCSPResponseResult = Success;
  if (stapledOCSPResponse) {
    PR_ASSERT(endEntityOrCA == EndEntityOrCA::MustBeEndEntity);
    bool expired;
    stapledOCSPResponseResult =
      VerifyAndMaybeCacheEncodedOCSPResponse(certID, time,
                                             maxOCSPLifetimeInDays,
                                             *stapledOCSPResponse,
                                             ResponseWasStapled, expired);
    if (stapledOCSPResponseResult == Success) {
      // stapled OCSP response present and good
      mOCSPStaplingStatus = CertVerifier::OCSP_STAPLING_GOOD;
      MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
             ("NSSCertDBTrustDomain: stapled OCSP response: good"));
      return Success;
    }
    if (stapledOCSPResponseResult == Result::ERROR_OCSP_OLD_RESPONSE ||
        expired) {
      // stapled OCSP response present but expired
      mOCSPStaplingStatus = CertVerifier::OCSP_STAPLING_EXPIRED;
      MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
             ("NSSCertDBTrustDomain: expired stapled OCSP response"));
    } else {
      // stapled OCSP response present but invalid for some reason
      mOCSPStaplingStatus = CertVerifier::OCSP_STAPLING_INVALID;
      MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
             ("NSSCertDBTrustDomain: stapled OCSP response: failure"));
      return stapledOCSPResponseResult;
    }
  } else if (endEntityOrCA == EndEntityOrCA::MustBeEndEntity) {
    // no stapled OCSP response
    mOCSPStaplingStatus = CertVerifier::OCSP_STAPLING_NONE;
    MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
           ("NSSCertDBTrustDomain: no stapled OCSP response"));
  }

  Result cachedResponseResult = Success;
  Time cachedResponseValidThrough(Time::uninitialized);
  bool cachedResponsePresent = mOCSPCache.Get(certID,
                                              cachedResponseResult,
                                              cachedResponseValidThrough);
  if (cachedResponsePresent) {
    if (cachedResponseResult == Success && cachedResponseValidThrough >= time) {
      MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
             ("NSSCertDBTrustDomain: cached OCSP response: good"));
      return Success;
    }
    // If we have a cached revoked response, use it.
    if (cachedResponseResult == Result::ERROR_REVOKED_CERTIFICATE) {
      MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
             ("NSSCertDBTrustDomain: cached OCSP response: revoked"));
      return Result::ERROR_REVOKED_CERTIFICATE;
    }
    // The cached response may indicate an unknown certificate or it may be
    // expired. Don't return with either of these statuses yet - we may be
    // able to fetch a more recent one.
    MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
           ("NSSCertDBTrustDomain: cached OCSP response: error %ld valid "
           "until %lld", cachedResponseResult, cachedResponseValidThrough));
    // When a good cached response has expired, it is more convenient
    // to convert that to an error code and just deal with
    // cachedResponseResult from here on out.
    if (cachedResponseResult == Success && cachedResponseValidThrough < time) {
      cachedResponseResult = Result::ERROR_OCSP_OLD_RESPONSE;
    }
    // We may have a cached indication of server failure. Ignore it if
    // it has expired.
    if (cachedResponseResult != Success &&
        cachedResponseResult != Result::ERROR_OCSP_UNKNOWN_CERT &&
        cachedResponseResult != Result::ERROR_OCSP_OLD_RESPONSE &&
        cachedResponseValidThrough < time) {
      cachedResponseResult = Success;
      cachedResponsePresent = false;
    }
  } else {
    MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
           ("NSSCertDBTrustDomain: no cached OCSP response"));
  }
  // At this point, if and only if cachedErrorResult is Success, there was no
  // cached response.
  PR_ASSERT((!cachedResponsePresent && cachedResponseResult == Success) ||
            (cachedResponsePresent && cachedResponseResult != Success));

  // If we have a fresh OneCRL Blocklist we can skip OCSP for CA certs
  bool blocklistIsFresh;
  nsresult nsrv = mCertBlocklist->IsBlocklistFresh(&blocklistIsFresh);
  if (NS_FAILED(nsrv)) {
    return Result::FATAL_ERROR_LIBRARY_FAILURE;
  }

  // TODO: We still need to handle the fallback for expired responses. But,
  // if/when we disable OCSP fetching by default, it would be ambiguous whether
  // security.OCSP.enable==0 means "I want the default" or "I really never want
  // you to ever fetch OCSP."

  Duration shortLifetime(mCertShortLifetimeInDays * Time::ONE_DAY_IN_SECONDS);

  if ((mOCSPFetching == NeverFetchOCSP) ||
      (validityDuration < shortLifetime) ||
      (endEntityOrCA == EndEntityOrCA::MustBeCA &&
       (mOCSPFetching == FetchOCSPForDVHardFail ||
        mOCSPFetching == FetchOCSPForDVSoftFail ||
        blocklistIsFresh))) {
    // We're not going to be doing any fetching, so if there was a cached
    // "unknown" response, say so.
    if (cachedResponseResult == Result::ERROR_OCSP_UNKNOWN_CERT) {
      return Result::ERROR_OCSP_UNKNOWN_CERT;
    }
    // If we're doing hard-fail, we want to know if we have a cached response
    // that has expired.
    if (mOCSPFetching == FetchOCSPForDVHardFail &&
        cachedResponseResult == Result::ERROR_OCSP_OLD_RESPONSE) {
      return Result::ERROR_OCSP_OLD_RESPONSE;
    }

    return Success;
  }

  if (mOCSPFetching == LocalOnlyOCSPForEV) {
    if (cachedResponseResult != Success) {
      return cachedResponseResult;
    }
    return Result::ERROR_OCSP_UNKNOWN_CERT;
  }

  ScopedPLArenaPool arena(PORT_NewArena(DER_DEFAULT_CHUNKSIZE));
  if (!arena) {
    return Result::FATAL_ERROR_NO_MEMORY;
  }

  Result rv;
  const char* url = nullptr; // owned by the arena

  if (aiaExtension) {
    rv = GetOCSPAuthorityInfoAccessLocation(arena.get(), *aiaExtension, url);
    if (rv != Success) {
      return rv;
    }
  }

  if (!url) {
    if (mOCSPFetching == FetchOCSPForEV ||
        cachedResponseResult == Result::ERROR_OCSP_UNKNOWN_CERT) {
      return Result::ERROR_OCSP_UNKNOWN_CERT;
    }
    if (cachedResponseResult == Result::ERROR_OCSP_OLD_RESPONSE) {
      return Result::ERROR_OCSP_OLD_RESPONSE;
    }
    if (stapledOCSPResponseResult != Success) {
      return stapledOCSPResponseResult;
    }

    // Nothing to do if we don't have an OCSP responder URI for the cert; just
    // assume it is good. Note that this is the confusing, but intended,
    // interpretation of "strict" revocation checking in the face of a
    // certificate that lacks an OCSP responder URI.
    return Success;
  }

  // Only request a response if we didn't have a cached indication of failure
  // (don't keep requesting responses from a failing server).
  Input response;
  bool attemptedRequest;
  if (cachedResponseResult == Success ||
      cachedResponseResult == Result::ERROR_OCSP_UNKNOWN_CERT ||
      cachedResponseResult == Result::ERROR_OCSP_OLD_RESPONSE) {
    uint8_t ocspRequest[OCSP_REQUEST_MAX_LENGTH];
    size_t ocspRequestLength;
    rv = CreateEncodedOCSPRequest(*this, certID, ocspRequest,
                                  ocspRequestLength);
    if (rv != Success) {
      return rv;
    }
    SECItem ocspRequestItem = {
      siBuffer,
      ocspRequest,
      static_cast<unsigned int>(ocspRequestLength)
    };
    // Owned by arena
    const SECItem* responseSECItem =
      DoOCSPRequest(arena.get(), url, &ocspRequestItem,
                    OCSPFetchingTypeToTimeoutTime(mOCSPFetching),
                    mOCSPGetConfig == CertVerifier::ocspGetEnabled);
    if (!responseSECItem) {
      rv = MapPRErrorCodeToResult(PR_GetError());
    } else if (response.Init(responseSECItem->data, responseSECItem->len)
                 != Success) {
      rv = Result::ERROR_OCSP_MALFORMED_RESPONSE; // too big
    }
    attemptedRequest = true;
  } else {
    rv = cachedResponseResult;
    attemptedRequest = false;
  }

  if (response.GetLength() == 0) {
    Result error = rv;
    if (attemptedRequest) {
      Time timeout(time);
      if (timeout.AddSeconds(ServerFailureDelaySeconds) != Success) {
        return Result::FATAL_ERROR_LIBRARY_FAILURE; // integer overflow
      }
      rv = mOCSPCache.Put(certID, error, time, timeout);
      if (rv != Success) {
        return rv;
      }
    }
    if (mOCSPFetching != FetchOCSPForDVSoftFail) {
      MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
             ("NSSCertDBTrustDomain: returning SECFailure after "
              "OCSP request failure"));
      return error;
    }
    if (cachedResponseResult == Result::ERROR_OCSP_UNKNOWN_CERT) {
      MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
             ("NSSCertDBTrustDomain: returning SECFailure from cached "
              "response after OCSP request failure"));
      return cachedResponseResult;
    }
    if (stapledOCSPResponseResult != Success) {
      MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
             ("NSSCertDBTrustDomain: returning SECFailure from expired "
              "stapled response after OCSP request failure"));
      return stapledOCSPResponseResult;
    }

    MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
           ("NSSCertDBTrustDomain: returning SECSuccess after "
            "OCSP request failure"));
    return Success; // Soft fail -> success :(
  }

  // If the response from the network has expired but indicates a revoked
  // or unknown certificate, PR_GetError() will return the appropriate error.
  // We actually ignore expired here.
  bool expired;
  rv = VerifyAndMaybeCacheEncodedOCSPResponse(certID, time,
                                              maxOCSPLifetimeInDays,
                                              response, ResponseIsFromNetwork,
                                              expired);
  if (rv == Success || mOCSPFetching != FetchOCSPForDVSoftFail) {
    MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
      ("NSSCertDBTrustDomain: returning after VerifyEncodedOCSPResponse"));
    return rv;
  }

  if (rv == Result::ERROR_OCSP_UNKNOWN_CERT ||
      rv == Result::ERROR_REVOKED_CERTIFICATE) {
    return rv;
  }
  if (stapledOCSPResponseResult != Success) {
    MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
           ("NSSCertDBTrustDomain: returning SECFailure from expired stapled "
            "response after OCSP request verification failure"));
    return stapledOCSPResponseResult;
  }

  MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
         ("NSSCertDBTrustDomain: end of CheckRevocation"));

  return Success; // Soft fail -> success :(
}

Result
NSSCertDBTrustDomain::VerifyAndMaybeCacheEncodedOCSPResponse(
  const CertID& certID, Time time, uint16_t maxLifetimeInDays,
  Input encodedResponse, EncodedResponseSource responseSource,
  /*out*/ bool& expired)
{
  Time thisUpdate(Time::uninitialized);
  Time validThrough(Time::uninitialized);

  // We use a try and fallback approach which first mandates good signature
  // digest algorithms, then falls back to SHA-1 if this fails. If a delegated
  // OCSP response signing certificate was issued with a SHA-1 signature,
  // verification initially fails. We cache the failure and then re-use that
  // result even when doing fallback (i.e. when weak signature digest algorithms
  // should succeed). To address this we use an OCSPVerificationTrustDomain
  // here, rather than using *this, to ensure verification succeeds for all
  // allowed signature digest algorithms.
  OCSPVerificationTrustDomain trustDomain(*this);
  Result rv = VerifyEncodedOCSPResponse(trustDomain, certID, time,
                                        maxLifetimeInDays, encodedResponse,
                                        expired, &thisUpdate, &validThrough);
  // If a response was stapled and expired, we don't want to cache it. Return
  // early to simplify the logic here.
  if (responseSource == ResponseWasStapled && expired) {
    PR_ASSERT(rv != Success);
    return rv;
  }
  // validThrough is only trustworthy if the response successfully verifies
  // or it indicates a revoked or unknown certificate.
  // If this isn't the case, store an indication of failure (to prevent
  // repeatedly requesting a response from a failing server).
  if (rv != Success && rv != Result::ERROR_REVOKED_CERTIFICATE &&
      rv != Result::ERROR_OCSP_UNKNOWN_CERT) {
    validThrough = time;
    if (validThrough.AddSeconds(ServerFailureDelaySeconds) != Success) {
      return Result::FATAL_ERROR_LIBRARY_FAILURE; // integer overflow
    }
  }
  if (responseSource == ResponseIsFromNetwork ||
      rv == Success ||
      rv == Result::ERROR_REVOKED_CERTIFICATE ||
      rv == Result::ERROR_OCSP_UNKNOWN_CERT) {
    MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
           ("NSSCertDBTrustDomain: caching OCSP response"));
    Result putRV = mOCSPCache.Put(certID, rv, thisUpdate, validThrough);
    if (putRV != Success) {
      return putRV;
    }
  }

  return rv;
}

static const uint8_t CNNIC_ROOT_CA_SUBJECT_DATA[] =
  "\x30\x32\x31\x0B\x30\x09\x06\x03\x55\x04\x06\x13\x02\x43\x4E\x31\x0E\x30"
  "\x0C\x06\x03\x55\x04\x0A\x13\x05\x43\x4E\x4E\x49\x43\x31\x13\x30\x11\x06"
  "\x03\x55\x04\x03\x13\x0A\x43\x4E\x4E\x49\x43\x20\x52\x4F\x4F\x54";

static const uint8_t CNNIC_EV_ROOT_CA_SUBJECT_DATA[] =
  "\x30\x81\x8A\x31\x0B\x30\x09\x06\x03\x55\x04\x06\x13\x02\x43\x4E\x31\x32"
  "\x30\x30\x06\x03\x55\x04\x0A\x0C\x29\x43\x68\x69\x6E\x61\x20\x49\x6E\x74"
  "\x65\x72\x6E\x65\x74\x20\x4E\x65\x74\x77\x6F\x72\x6B\x20\x49\x6E\x66\x6F"
  "\x72\x6D\x61\x74\x69\x6F\x6E\x20\x43\x65\x6E\x74\x65\x72\x31\x47\x30\x45"
  "\x06\x03\x55\x04\x03\x0C\x3E\x43\x68\x69\x6E\x61\x20\x49\x6E\x74\x65\x72"
  "\x6E\x65\x74\x20\x4E\x65\x74\x77\x6F\x72\x6B\x20\x49\x6E\x66\x6F\x72\x6D"
  "\x61\x74\x69\x6F\x6E\x20\x43\x65\x6E\x74\x65\x72\x20\x45\x56\x20\x43\x65"
  "\x72\x74\x69\x66\x69\x63\x61\x74\x65\x73\x20\x52\x6F\x6F\x74";

class WhitelistedCNNICHashBinarySearchComparator
{
public:
  explicit WhitelistedCNNICHashBinarySearchComparator(const uint8_t* aTarget,
                                                      size_t aTargetLength)
    : mTarget(aTarget)
  {
    MOZ_ASSERT(aTargetLength == CNNIC_WHITELIST_HASH_LEN,
               "Hashes should be of the same length.");
  }

  int operator()(const WhitelistedCNNICHash val) const {
    return memcmp(mTarget, val.hash, CNNIC_WHITELIST_HASH_LEN);
  }

private:
  const uint8_t* mTarget;
};

Result
NSSCertDBTrustDomain::IsChainValid(const DERArray& certArray, Time time)
{
  MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
         ("NSSCertDBTrustDomain: IsChainValid"));

  ScopedCERTCertList certList;
  SECStatus srv = ConstructCERTCertListFromReversedDERArray(certArray,
                                                            certList);
  if (srv != SECSuccess) {
    return MapPRErrorCodeToResult(PR_GetError());
  }
  if (CERT_LIST_EMPTY(certList)) {
    return Result::FATAL_ERROR_LIBRARY_FAILURE;
  }

  // If the certificate appears to have been issued by a CNNIC root, only allow
  // it if it is on the whitelist.
  CERTCertListNode* rootNode = CERT_LIST_TAIL(certList);
  if (!rootNode) {
    return Result::FATAL_ERROR_LIBRARY_FAILURE;
  }
  CERTCertificate* root = rootNode->cert;
  if (!root) {
    return Result::FATAL_ERROR_LIBRARY_FAILURE;
  }
  if ((root->derSubject.len == sizeof(CNNIC_ROOT_CA_SUBJECT_DATA) - 1 &&
       memcmp(root->derSubject.data, CNNIC_ROOT_CA_SUBJECT_DATA,
              root->derSubject.len) == 0) ||
      (root->derSubject.len == sizeof(CNNIC_EV_ROOT_CA_SUBJECT_DATA) - 1 &&
       memcmp(root->derSubject.data, CNNIC_EV_ROOT_CA_SUBJECT_DATA,
              root->derSubject.len) == 0)) {
    CERTCertListNode* certNode = CERT_LIST_HEAD(certList);
    if (!certNode) {
      return Result::FATAL_ERROR_LIBRARY_FAILURE;
    }
    CERTCertificate* cert = certNode->cert;
    if (!cert) {
      return Result::FATAL_ERROR_LIBRARY_FAILURE;
    }
    Digest digest;
    nsresult nsrv = digest.DigestBuf(SEC_OID_SHA256, cert->derCert.data,
                                     cert->derCert.len);
    if (NS_FAILED(nsrv)) {
      return Result::FATAL_ERROR_LIBRARY_FAILURE;
    }
    const uint8_t* certHash(
      reinterpret_cast<const uint8_t*>(digest.get().data));
    size_t certHashLen = digest.get().len;
    size_t unused;
    if (!mozilla::BinarySearchIf(WhitelistedCNNICHashes, 0,
                                 ArrayLength(WhitelistedCNNICHashes),
                                 WhitelistedCNNICHashBinarySearchComparator(
                                   certHash, certHashLen),
                                 &unused)) {
      return Result::ERROR_REVOKED_CERTIFICATE;
    }
  }

  bool isBuiltInRoot = false;
  srv = IsCertBuiltInRoot(root, isBuiltInRoot);
  if (srv != SECSuccess) {
    return MapPRErrorCodeToResult(PR_GetError());
  }
  bool skipPinningChecksBecauseOfMITMMode =
    (!isBuiltInRoot && mPinningMode == CertVerifier::pinningAllowUserCAMITM);
  // If mHostname isn't set, we're not verifying in the context of a TLS
  // handshake, so don't verify HPKP in those cases.
  if (mHostname && (mPinningMode != CertVerifier::pinningDisabled) &&
      !skipPinningChecksBecauseOfMITMMode) {
    bool enforceTestMode =
      (mPinningMode == CertVerifier::pinningEnforceTestMode);
    bool chainHasValidPins;
    nsresult nsrv = PublicKeyPinningService::ChainHasValidPins(
      certList, mHostname, time, enforceTestMode, chainHasValidPins,
      mPinningTelemetryInfo);
    if (NS_FAILED(nsrv)) {
      return Result::FATAL_ERROR_LIBRARY_FAILURE;
    }
    if (!chainHasValidPins) {
      return Result::ERROR_KEY_PINNING_FAILURE;
    }
  }

  if (mBuiltChain) {
    *mBuiltChain = certList.forget();
  }

  return Success;
}

Result
NSSCertDBTrustDomain::CheckSignatureDigestAlgorithm(DigestAlgorithm aAlg,
                                                    EndEntityOrCA endEntityOrCA,
                                                    Time notBefore)
{
  // (new Date("2016-01-01T00:00:00Z")).getTime() / 1000
  static const Time JANUARY_FIRST_2016 = TimeFromEpochInSeconds(1451606400);

  MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
          ("NSSCertDBTrustDomain: CheckSignatureDigestAlgorithm"));
  if (aAlg == DigestAlgorithm::sha1) {
    // First check based on SHA1Mode
    switch (mSHA1Mode) {
      case CertVerifier::SHA1Mode::Forbidden:
        MOZ_LOG(gCertVerifierLog, LogLevel::Debug, ("SHA-1 certificate rejected"));
        return Result::ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED;
      case CertVerifier::SHA1Mode::OnlyBefore2016:
        if (JANUARY_FIRST_2016 <= notBefore) {
          MOZ_LOG(gCertVerifierLog, LogLevel::Debug, ("Post-2015 SHA-1 certificate rejected"));
          return Result::ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED;
        }
        break;
      case CertVerifier::SHA1Mode::Allowed:
      default:
        break;
    }

    // Then check the signatureDigestOption values
    if (mSignatureDigestOption == DisableSHA1Everywhere) {
      MOZ_LOG(gCertVerifierLog, LogLevel::Debug, ("SHA-1 certificate rejected"));
      return Result::ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED;
    }

    if (endEntityOrCA == EndEntityOrCA::MustBeCA) {
      MOZ_LOG(gCertVerifierLog, LogLevel::Debug, ("CA cert is SHA-1"));
      return mSignatureDigestOption == DisableSHA1ForCA
             ? Result::ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED
             : Success;
    } else {
      MOZ_LOG(gCertVerifierLog, LogLevel::Debug, ("EE cert is SHA-1"));
      return mSignatureDigestOption == DisableSHA1ForEE
             ? Result::ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED
             : Success;
    }
  }
  return Success;
}

Result
NSSCertDBTrustDomain::CheckRSAPublicKeyModulusSizeInBits(
  EndEntityOrCA /*endEntityOrCA*/, unsigned int modulusSizeInBits)
{
  if (modulusSizeInBits < mMinRSABits) {
    return Result::ERROR_INADEQUATE_KEY_SIZE;
  }
  return Success;
}

Result
NSSCertDBTrustDomain::VerifyRSAPKCS1SignedDigest(
  const SignedDigest& signedDigest,
  Input subjectPublicKeyInfo)
{
  return VerifyRSAPKCS1SignedDigestNSS(signedDigest, subjectPublicKeyInfo,
                                       mPinArg);
}

Result
NSSCertDBTrustDomain::CheckECDSACurveIsAcceptable(
  EndEntityOrCA /*endEntityOrCA*/, NamedCurve curve)
{
  switch (curve) {
    case NamedCurve::secp256r1: // fall through
    case NamedCurve::secp384r1: // fall through
    case NamedCurve::secp521r1:
      return Success;
  }

  return Result::ERROR_UNSUPPORTED_ELLIPTIC_CURVE;
}

Result
NSSCertDBTrustDomain::VerifyECDSASignedDigest(const SignedDigest& signedDigest,
                                              Input subjectPublicKeyInfo)
{
  return VerifyECDSASignedDigestNSS(signedDigest, subjectPublicKeyInfo,
                                    mPinArg);
}

Result
NSSCertDBTrustDomain::CheckValidityIsAcceptable(Time notBefore, Time notAfter,
                                                EndEntityOrCA endEntityOrCA,
                                                KeyPurposeId keyPurpose)
{
  if (endEntityOrCA != EndEntityOrCA::MustBeEndEntity) {
    return Success;
  }
  if (keyPurpose == KeyPurposeId::id_kp_OCSPSigning) {
    return Success;
  }

  Duration DURATION_39_MONTHS((3 * 365 + 3 * 31) * Time::ONE_DAY_IN_SECONDS);
  Duration maxValidityDuration(UINT64_MAX);
  Duration validityDuration(notBefore, notAfter);

  switch (mValidityCheckingMode) {
    case ValidityCheckingMode::CheckingOff:
      return Success;
    case ValidityCheckingMode::CheckForEV:
      // The EV Guidelines say the maximum is 27 months, but we use a higher
      // limit here:
      //  a) To (hopefully) minimize compatibility breakage.
      //  b) Because there was some talk about raising the limit to 39 months to
      //     match the BR limit.
      maxValidityDuration = DURATION_39_MONTHS;
      break;
    default:
      PR_NOT_REACHED("We're not handling every ValidityCheckingMode type");
  }

  if (validityDuration > maxValidityDuration) {
    return Result::ERROR_VALIDITY_TOO_LONG;
  }

  return Success;
}

namespace {

static char*
nss_addEscape(const char* string, char quote)
{
  char* newString = 0;
  size_t escapes = 0, size = 0;
  const char* src;
  char* dest;

  for (src = string; *src; src++) {
  if ((*src == quote) || (*src == '\\')) {
    escapes++;
  }
  size++;
  }

  newString = (char*) PORT_ZAlloc(escapes + size + 1u);
  if (!newString) {
    return nullptr;
  }

  for (src = string, dest = newString; *src; src++, dest++) {
    if ((*src == quote) || (*src == '\\')) {
      *dest++ = '\\';
    }
    *dest = *src;
  }

  return newString;
}

} // unnamed namespace

SECStatus
InitializeNSS(const char* dir, bool readOnly)
{
  // The NSS_INIT_NOROOTINIT flag turns off the loading of the root certs
  // module by NSS_Initialize because we will load it in InstallLoadableRoots
  // later.  It also allows us to work around a bug in the system NSS in
  // Ubuntu 8.04, which loads any nonexistent "<configdir>/libnssckbi.so" as
  // "/usr/lib/nss/libnssckbi.so".
  uint32_t flags = NSS_INIT_NOROOTINIT | NSS_INIT_OPTIMIZESPACE;
  if (readOnly) {
    flags |= NSS_INIT_READONLY;
  }
  return ::NSS_Initialize(dir, "", "", SECMOD_DB, flags);
}

void
DisableMD5()
{
  NSS_SetAlgorithmPolicy(SEC_OID_MD5,
    0, NSS_USE_ALG_IN_CERT_SIGNATURE | NSS_USE_ALG_IN_CMS_SIGNATURE);
  NSS_SetAlgorithmPolicy(SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION,
    0, NSS_USE_ALG_IN_CERT_SIGNATURE | NSS_USE_ALG_IN_CMS_SIGNATURE);
  NSS_SetAlgorithmPolicy(SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC,
    0, NSS_USE_ALG_IN_CERT_SIGNATURE | NSS_USE_ALG_IN_CMS_SIGNATURE);
}

SECStatus
LoadLoadableRoots(/*optional*/ const char* dir, const char* modNameUTF8)
{
  PR_ASSERT(modNameUTF8);

  if (!modNameUTF8) {
    PR_SetError(SEC_ERROR_INVALID_ARGS, 0);
    return SECFailure;
  }

  UniquePtr<char, void(&)(char*)>
    fullLibraryPath(PR_GetLibraryName(dir, "nssckbi"), PR_FreeLibraryName);
  if (!fullLibraryPath) {
    return SECFailure;
  }

  UniquePtr<char, void(&)(void*)>
    escaped_fullLibraryPath(nss_addEscape(fullLibraryPath.get(), '\"'),
                            PORT_Free);
  if (!escaped_fullLibraryPath) {
    return SECFailure;
  }

  // If a module exists with the same name, delete it.
  int modType;
  SECMOD_DeleteModule(modNameUTF8, &modType);

  UniquePtr<char, void(&)(char*)>
    pkcs11ModuleSpec(PR_smprintf("name=\"%s\" library=\"%s\"", modNameUTF8,
                                 escaped_fullLibraryPath.get()),
                     PR_smprintf_free);
  if (!pkcs11ModuleSpec) {
    return SECFailure;
  }

  ScopedSECMODModule rootsModule(SECMOD_LoadUserModule(pkcs11ModuleSpec.get(),
                                                       nullptr, false));
  if (!rootsModule) {
    return SECFailure;
  }

  if (!rootsModule->loaded) {
    PR_SetError(PR_INVALID_STATE_ERROR, 0);
    return SECFailure;
  }

  return SECSuccess;
}

void
UnloadLoadableRoots(const char* modNameUTF8)
{
  PR_ASSERT(modNameUTF8);
  ScopedSECMODModule rootsModule(SECMOD_FindModule(modNameUTF8));

  if (rootsModule) {
    SECMOD_UnloadUserModule(rootsModule.get());
  }
}

char*
DefaultServerNicknameForCert(CERTCertificate* cert)
{
  char* nickname = nullptr;
  int count;
  bool conflict;
  char* servername = nullptr;

  servername = CERT_GetCommonName(&cert->subject);
  if (!servername) {
    // Certs without common names are strange, but they do exist...
    // Let's try to use another string for the nickname
    servername = CERT_GetOrgUnitName(&cert->subject);
    if (!servername) {
      servername = CERT_GetOrgName(&cert->subject);
      if (!servername) {
        servername = CERT_GetLocalityName(&cert->subject);
        if (!servername) {
          servername = CERT_GetStateName(&cert->subject);
          if (!servername) {
            servername = CERT_GetCountryName(&cert->subject);
            if (!servername) {
              // We tried hard, there is nothing more we can do.
              // A cert without any names doesn't really make sense.
              return nullptr;
            }
          }
        }
      }
    }
  }

  count = 1;
  while (1) {
    if (count == 1) {
      nickname = PR_smprintf("%s", servername);
    }
    else {
      nickname = PR_smprintf("%s #%d", servername, count);
    }
    if (!nickname) {
      break;
    }

    conflict = SEC_CertNicknameConflict(nickname, &cert->derSubject,
                                        cert->dbhandle);
    if (!conflict) {
      break;
    }
    PR_Free(nickname);
    count++;
  }
  PR_FREEIF(servername);
  return nickname;
}

void
SaveIntermediateCerts(const ScopedCERTCertList& certList)
{
  if (!certList) {
    return;
  }

  bool isEndEntity = true;
  for (CERTCertListNode* node = CERT_LIST_HEAD(certList);
        !CERT_LIST_END(node, certList);
        node = CERT_LIST_NEXT(node)) {
    if (isEndEntity) {
      // Skip the end-entity; we only want to store intermediates
      isEndEntity = false;
      continue;
    }

    if (node->cert->slot) {
      // This cert was found on a token, no need to remember it in the temp db.
      continue;
    }

    if (node->cert->isperm) {
      // We don't need to remember certs already stored in perm db.
      continue;
    }

    // We have found a signer cert that we want to remember.
    char* nickname = DefaultServerNicknameForCert(node->cert);
    if (nickname && *nickname) {
      ScopedPK11SlotInfo slot(PK11_GetInternalKeySlot());
      if (slot) {
        PK11_ImportCert(slot.get(), node->cert, CK_INVALID_HANDLE,
                        nickname, false);
      }
    }
    PR_FREEIF(nickname);
  }
}

} } // namespace mozilla::psm