1 files changed, 90 insertions, 0 deletions
diff --git a/security/manager/ssl/RootCertificateTelemetryUtils.cpp b/security/manager/ssl/RootCertificateTelemetryUtils.cpp
new file mode 100644
index 000000000..3f9ea3eb6
--- /dev/null
+++ b/security/manager/ssl/RootCertificateTelemetryUtils.cpp
@@ -0,0 +1,90 @@
+/* -*- 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 "RootCertificateTelemetryUtils.h"
+
+#include "mozilla/Logging.h"
+#include "RootHashes.inc" // Note: Generated by genRootCAHashes.js
+#include "ScopedNSSTypes.h"
+#include "mozilla/ArrayUtils.h"
+
+namespace mozilla { namespace psm {
+
+mozilla::LazyLogModule gPublicKeyPinningTelemetryLog("PublicKeyPinningTelemetryService");
+
+// Used in the BinarySearch method, this does a memcmp between the pointer
+// provided to its construtor and whatever the binary search is looking for.
+//
+// This implementation assumes everything to be of HASH_LEN, so it should not
+// be used generically.
+class BinaryHashSearchArrayComparator
+{
+public:
+  explicit BinaryHashSearchArrayComparator(const uint8_t* aTarget, size_t len)
+    : mTarget(aTarget)
+  {
+    NS_ASSERTION(len == HASH_LEN, "Hashes should be of the same length.");
+  }
+
+  int operator()(const CertAuthorityHash val) const {
+    return memcmp(mTarget, val.hash, HASH_LEN);
+  }
+
+private:
+  const uint8_t* mTarget;
+};
+
+// Perform a hash of the provided cert, then search in the RootHashes.inc data
+// structure for a matching bin number.
+int32_t
+RootCABinNumber(const SECItem* cert)
+{
+  Digest digest;
+
+  // Compute SHA256 hash of the certificate
+  nsresult rv = digest.DigestBuf(SEC_OID_SHA256, cert->data, cert->len);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return ROOT_CERTIFICATE_HASH_FAILURE;
+  }
+
+  // Compare against list of stored hashes
+  size_t idx;
+
+  MOZ_LOG(gPublicKeyPinningTelemetryLog, LogLevel::Debug,
+           ("pkpinTelem: First bytes %02hx %02hx %02hx %02hx\n",
+            digest.get().data[0], digest.get().data[1], digest.get().data[2], digest.get().data[3]));
+
+  if (mozilla::BinarySearchIf(ROOT_TABLE, 0, ArrayLength(ROOT_TABLE),
+        BinaryHashSearchArrayComparator(static_cast<uint8_t*>(digest.get().data),
+                                        digest.get().len),
+        &idx)) {
+
+    MOZ_LOG(gPublicKeyPinningTelemetryLog, LogLevel::Debug,
+          ("pkpinTelem: Telemetry index was %lu, bin is %d\n",
+           idx, ROOT_TABLE[idx].binNumber));
+    return (int32_t) ROOT_TABLE[idx].binNumber;
+  }
+
+  // Didn't match.
+  return ROOT_CERTIFICATE_UNKNOWN;
+}
+
+
+// Attempt to increment the appropriate bin in the provided Telemetry probe ID. If
+// there was a hash failure, we do nothing.
+void
+AccumulateTelemetryForRootCA(mozilla::Telemetry::ID probe, 
+  const CERTCertificate* cert)
+{
+  int32_t binId = RootCABinNumber(&cert->derCert);
+
+  if (binId != ROOT_CERTIFICATE_HASH_FAILURE) {
+    Accumulate(probe, binId);
+  }
+}
+
+} // namespace psm
+} // namespace mozilla