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
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "WebTransportCertificateVerifier.h"
#include "ScopedNSSTypes.h"
#include "nss/mozpkix/pkixutil.h"
#include "nss/mozpkix/pkixcheck.h"
#include "hasht.h"
namespace mozilla::psm {
class ServerCertHashesTrustDomain : public mozilla::pkix::TrustDomain {
public:
ServerCertHashesTrustDomain() = default;
virtual mozilla::pkix::Result FindIssuer(
mozilla::pkix::Input encodedIssuerName, IssuerChecker& checker,
mozilla::pkix::Time time) override;
virtual mozilla::pkix::Result GetCertTrust(
mozilla::pkix::EndEntityOrCA endEntityOrCA,
const mozilla::pkix::CertPolicyId& policy,
mozilla::pkix::Input candidateCertDER,
/*out*/ mozilla::pkix::TrustLevel& trustLevel) override;
virtual mozilla::pkix::Result CheckSignatureDigestAlgorithm(
mozilla::pkix::DigestAlgorithm digestAlg,
mozilla::pkix::EndEntityOrCA endEntityOrCA,
mozilla::pkix::Time notBefore) override;
virtual mozilla::pkix::Result CheckRSAPublicKeyModulusSizeInBits(
mozilla::pkix::EndEntityOrCA endEntityOrCA,
unsigned int modulusSizeInBits) override;
virtual mozilla::pkix::Result VerifyRSAPKCS1SignedData(
mozilla::pkix::Input data, mozilla::pkix::DigestAlgorithm digestAlgorithm,
mozilla::pkix::Input signature,
mozilla::pkix::Input subjectPublicKeyInfo) override;
virtual mozilla::pkix::Result VerifyRSAPSSSignedData(
mozilla::pkix::Input data, mozilla::pkix::DigestAlgorithm digestAlgorithm,
mozilla::pkix::Input signature,
mozilla::pkix::Input subjectPublicKeyInfo) override;
virtual mozilla::pkix::Result CheckECDSACurveIsAcceptable(
mozilla::pkix::EndEntityOrCA endEntityOrCA,
mozilla::pkix::NamedCurve curve) override;
virtual mozilla::pkix::Result VerifyECDSASignedData(
mozilla::pkix::Input data, mozilla::pkix::DigestAlgorithm digestAlgorithm,
mozilla::pkix::Input signature,
mozilla::pkix::Input subjectPublicKeyInfo) override;
virtual mozilla::pkix::Result DigestBuf(
mozilla::pkix::Input item, mozilla::pkix::DigestAlgorithm digestAlg,
/*out*/ uint8_t* digestBuf, size_t digestBufLen) override;
virtual mozilla::pkix::Result CheckValidityIsAcceptable(
mozilla::pkix::Time notBefore, mozilla::pkix::Time notAfter,
mozilla::pkix::EndEntityOrCA endEntityOrCA,
mozilla::pkix::KeyPurposeId keyPurpose) override;
virtual mozilla::pkix::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 mozilla::pkix::Result IsChainValid(
const mozilla::pkix::DERArray& certChain, mozilla::pkix::Time time,
const mozilla::pkix::CertPolicyId& requiredPolicy) override;
virtual void NoteAuxiliaryExtension(
mozilla::pkix::AuxiliaryExtension extension,
mozilla::pkix::Input extensionData) override;
};
mozilla::pkix::Result ServerCertHashesTrustDomain::FindIssuer(
mozilla::pkix::Input encodedIssuerName, IssuerChecker& checker,
mozilla::pkix::Time time) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::GetCertTrust(
mozilla::pkix::EndEntityOrCA endEntityOrCA,
const mozilla::pkix::CertPolicyId& policy,
mozilla::pkix::Input candidateCertDER,
/*out*/ mozilla::pkix::TrustLevel& trustLevel) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result
ServerCertHashesTrustDomain::CheckSignatureDigestAlgorithm(
mozilla::pkix::DigestAlgorithm digestAlg,
mozilla::pkix::EndEntityOrCA endEntityOrCA, mozilla::pkix::Time notBefore) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result
ServerCertHashesTrustDomain::CheckRSAPublicKeyModulusSizeInBits(
mozilla::pkix::EndEntityOrCA endEntityOrCA,
unsigned int modulusSizeInBits) {
return mozilla::pkix::Result::
ERROR_UNSUPPORTED_KEYALG; // RSA is not supported for
// serverCertificateHashes,
// Chromium does only support it for an intermediate period due to spec
// change, we do not support it.
}
mozilla::pkix::Result ServerCertHashesTrustDomain::VerifyRSAPKCS1SignedData(
mozilla::pkix::Input data, mozilla::pkix::DigestAlgorithm digestAlgorithm,
mozilla::pkix::Input signature, mozilla::pkix::Input subjectPublicKeyInfo) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::VerifyRSAPSSSignedData(
mozilla::pkix::Input data, mozilla::pkix::DigestAlgorithm digestAlgorithm,
mozilla::pkix::Input signature, mozilla::pkix::Input subjectPublicKeyInfo) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::CheckECDSACurveIsAcceptable(
mozilla::pkix::EndEntityOrCA endEntityOrCA,
mozilla::pkix::NamedCurve curve) {
return mozilla::pkix::Result::Success;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::VerifyECDSASignedData(
mozilla::pkix::Input data, mozilla::pkix::DigestAlgorithm digestAlgorithm,
mozilla::pkix::Input signature, mozilla::pkix::Input subjectPublicKeyInfo) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::DigestBuf(
mozilla::pkix::Input item, mozilla::pkix::DigestAlgorithm digestAlg,
/*out*/ uint8_t* digestBuf, size_t digestBufLen) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::CheckValidityIsAcceptable(
mozilla::pkix::Time notBefore, mozilla::pkix::Time notAfter,
mozilla::pkix::EndEntityOrCA endEntityOrCA,
mozilla::pkix::KeyPurposeId keyPurpose) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::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) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::IsChainValid(
const mozilla::pkix::DERArray& certChain, mozilla::pkix::Time time,
const mozilla::pkix::CertPolicyId& requiredPolicy) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
void ServerCertHashesTrustDomain::NoteAuxiliaryExtension(
mozilla::pkix::AuxiliaryExtension extension,
mozilla::pkix::Input extensionData) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
}
} // namespace mozilla::psm
namespace mozilla::net {
// Does certificate verificate as required for serverCertificateHashes
// This function is currently only used for Quic, but may be used later also for
// http/2
mozilla::pkix::Result AuthCertificateWithServerCertificateHashes(
nsTArray<uint8_t>& peerCert,
const nsTArray<RefPtr<nsIWebTransportHash>>& aServerCertHashes) {
using namespace mozilla::pkix;
Input certDER;
mozilla::pkix::Result rv =
certDER.Init(peerCert.Elements(), peerCert.Length());
if (rv != Success) {
return rv;
}
BackCert cert(certDER, EndEntityOrCA::MustBeEndEntity, nullptr);
rv = cert.Init();
if (rv != Success) {
return rv;
}
Time notBefore(Time::uninitialized);
Time notAfter(Time::uninitialized);
rv = ParseValidity(cert.GetValidity(), ¬Before, ¬After);
if (rv != Success) {
return rv;
}
// now we check that validity is not greater than 14 days
Duration certDuration(notBefore, notAfter);
if (certDuration > Duration(60 * 60 * 24 * 14)) {
return mozilla::pkix::Result::ERROR_VALIDITY_TOO_LONG;
}
Time now = Now();
// and if the certificate is actually valid?
rv = CheckValidity(now, notBefore, notAfter);
if (rv != Success) {
return rv;
}
mozilla::psm::ServerCertHashesTrustDomain trustDomain;
rv = CheckSubjectPublicKeyInfo(
cert.GetSubjectPublicKeyInfo(), trustDomain,
EndEntityOrCA::MustBeEndEntity /* should be ignored*/);
if (rv != Success) {
return rv;
}
// ok now the final check, calculate the hash and compare it:
// https://w3c.github.io/webtransport/#compute-a-certificate-hash
nsTArray<uint8_t> certHash;
if (NS_FAILED(Digest::DigestBuf(SEC_OID_SHA256, peerCert, certHash)) ||
certHash.Length() != SHA256_LENGTH) {
return mozilla::pkix::Result::ERROR_INVALID_ALGORITHM;
}
// https://w3c.github.io/webtransport/#verify-a-certificate-hash
for (const auto& hash : aServerCertHashes) {
nsCString algorithm;
if (NS_FAILED(hash->GetAlgorithm(algorithm)) || algorithm != "sha-256") {
continue;
}
nsTArray<uint8_t> value;
if (NS_FAILED(hash->GetValue(value))) {
continue;
}
if (certHash == value) {
return Success;
}
}
return mozilla::pkix::Result::ERROR_UNTRUSTED_CERT;
}
} // namespace mozilla::net
|
