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
|
/* -*- 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
|
