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92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "RootCertificateTelemetryUtils.h"
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#include "mozilla/Logging.h"
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#include "RootHashes.inc" // Note: Generated by genRootCAHashes.js
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#include "ScopedNSSTypes.h"
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#include "mozilla/ArrayUtils.h"
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namespace mozilla { namespace psm {
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PRLogModuleInfo* gPublicKeyPinningTelemetryLog =
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PR_NewLogModule("PublicKeyPinningTelemetryService");
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// Used in the BinarySearch method, this does a memcmp between the pointer
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// provided to its construtor and whatever the binary search is looking for.
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//
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// This implementation assumes everything to be of HASH_LEN, so it should not
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// be used generically.
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class BinaryHashSearchArrayComparator
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{
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public:
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explicit BinaryHashSearchArrayComparator(const uint8_t* aTarget, size_t len)
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: mTarget(aTarget)
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{
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NS_ASSERTION(len == HASH_LEN, "Hashes should be of the same length.");
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}
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int operator()(const CertAuthorityHash val) const {
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return memcmp(mTarget, val.hash, HASH_LEN);
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}
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private:
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const uint8_t* mTarget;
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};
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// Perform a hash of the provided cert, then search in the RootHashes.inc data
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// structure for a matching bin number.
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int32_t
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RootCABinNumber(const SECItem* cert)
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{
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Digest digest;
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// Compute SHA256 hash of the certificate
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nsresult rv = digest.DigestBuf(SEC_OID_SHA256, cert->data, cert->len);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return ROOT_CERTIFICATE_HASH_FAILURE;
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}
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// Compare against list of stored hashes
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size_t idx;
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MOZ_LOG(gPublicKeyPinningTelemetryLog, LogLevel::Debug,
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("pkpinTelem: First bytes %02hx %02hx %02hx %02hx\n",
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digest.get().data[0], digest.get().data[1], digest.get().data[2], digest.get().data[3]));
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if (mozilla::BinarySearchIf(ROOT_TABLE, 0, ArrayLength(ROOT_TABLE),
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BinaryHashSearchArrayComparator(
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reinterpret_cast<const uint8_t*>(digest.get().data), digest.get().len),
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&idx)) {
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MOZ_LOG(gPublicKeyPinningTelemetryLog, LogLevel::Debug,
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("pkpinTelem: Telemetry index was %lu, bin is %d\n",
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idx, ROOT_TABLE[idx].binNumber));
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return (int32_t) ROOT_TABLE[idx].binNumber;
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}
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// Didn't match.
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return ROOT_CERTIFICATE_UNKNOWN;
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}
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// Attempt to increment the appropriate bin in the provided Telemetry probe ID. If
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// there was a hash failure, we do nothing.
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void
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AccumulateTelemetryForRootCA(mozilla::Telemetry::ID probe,
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const CERTCertificate* cert)
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{
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int32_t binId = RootCABinNumber(&cert->derCert);
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if (binId != ROOT_CERTIFICATE_HASH_FAILURE) {
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Accumulate(probe, binId);
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}
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}
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} // namespace psm
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} // namespace mozilla
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