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
|
/* -*- 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 code is made available to you under your choice of the following sets
* of licensing terms:
*/
/* 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/.
*/
/* Copyright 2013 Mozilla Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef mozilla_pkix_pkix_h
#define mozilla_pkix_pkix_h
#include "mozpkix/pkixtypes.h"
namespace mozilla {
namespace pkix {
// ----------------------------------------------------------------------------
// LIMITED SUPPORT FOR CERTIFICATE POLICIES
//
// If SEC_OID_X509_ANY_POLICY is passed as the value of the requiredPolicy
// parameter then all policy validation will be skipped. Otherwise, path
// building and validation will be done for the given policy.
//
// In RFC 5280 terms:
//
// * user-initial-policy-set = { requiredPolicy }.
// * initial-explicit-policy = true
// * initial-any-policy-inhibit = false
//
// We allow intermediate cerificates to use this extension but since
// we do not process the inhibit anyPolicy extesion we will fail if this
// extension is present. TODO(bug 989051)
// Because we force explicit policy and because we prohibit policy mapping, we
// do not bother processing the policy mapping, or policy constraint.
//
// ----------------------------------------------------------------------------
// ERROR RANKING
//
// BuildCertChain prioritizes certain checks ahead of others so that when a
// certificate chain has multiple errors, the "most serious" error is
// returned. In practice, this ranking of seriousness is tied directly to how
// Firefox's certificate error override mechanism.
//
// The ranking is:
//
// 1. Active distrust (Result::ERROR_UNTRUSTED_CERT).
// 2. Problems with issuer-independent properties for CA certificates.
// 3. Unknown issuer (Result::ERROR_UNKNOWN_ISSUER).
// 4. Problems with issuer-independent properties for EE certificates.
// 5. Revocation.
//
// In particular, if BuildCertChain returns Result::ERROR_UNKNOWN_ISSUER then
// the caller can call CERT_CheckCertValidTimes to determine if the certificate
// is ALSO expired.
//
// It would be better if revocation were prioritized above expiration and
// unknown issuer. However, it is impossible to do revocation checking without
// knowing the issuer, since the issuer information is needed to validate the
// revocation information. Also, generally revocation checking only works
// during the validity period of the certificate.
//
// In general, when path building fails, BuildCertChain will return
// Result::ERROR_UNKNOWN_ISSUER. However, if all attempted paths resulted in
// the same error (which is trivially true when there is only one potential
// path), more specific errors will be returned.
//
// ----------------------------------------------------------------------------
// Meanings of specific error codes can be found in Result.h
// This function attempts to find a trustworthy path from the supplied
// certificate to a trust anchor. In the event that no trusted path is found,
// the method returns an error result; the error ranking is described above.
//
// Parameters:
// time:
// Timestamp for which the chain should be valid; this is useful to
// analyze whether a record was trustworthy when it was made.
// requiredKeyUsageIfPresent:
// What key usage bits must be set, if the extension is present at all,
// to be considered a valid chain. Multiple values should be OR'd
// together. If you don't want to specify anything, use
// KeyUsage::noParticularKeyUsageRequired.
// requiredEKUIfPresent:
// What extended key usage bits must be set, if the EKU extension
// exists, to be considered a valid chain. Multiple values should be
// OR'd together. If you don't want to specify anything, use
// KeyPurposeId::anyExtendedKeyUsage.
// requiredPolicy:
// This is the policy to apply; typically included in EV certificates.
// If there is no policy, pass in CertPolicyId::anyPolicy.
Result BuildCertChain(TrustDomain& trustDomain, Input cert, Time time,
EndEntityOrCA endEntityOrCA,
KeyUsage requiredKeyUsageIfPresent,
KeyPurposeId requiredEKUIfPresent,
const CertPolicyId& requiredPolicy,
/*optional*/ const Input* stapledOCSPResponse);
// Verify that the given end-entity cert, which is assumed to have been already
// validated with BuildCertChain, is valid for the given hostname. The matching
// function attempts to implement RFC 6125 with a couple of differences:
// - IP addresses are out of scope of RFC 6125, but this method accepts them for
// backward compatibility (see SearchNames in pkixnames.cpp)
// - A wildcard in a DNS-ID may only appear as the entirety of the first label.
Result CheckCertHostname(Input cert, Input hostname,
NameMatchingPolicy& nameMatchingPolicy);
// Construct an RFC-6960-encoded OCSP request, ready for submission to a
// responder, for the provided CertID. The request has no extensions.
static const size_t OCSP_REQUEST_MAX_LENGTH = 127;
Result CreateEncodedOCSPRequest(TrustDomain& trustDomain, const CertID& certID,
/*out*/ uint8_t (&out)[OCSP_REQUEST_MAX_LENGTH],
/*out*/ size_t& outLen);
// The out parameter expired will be true if the response has expired. If the
// response also indicates a revoked or unknown certificate, that error
// will be returned. Otherwise, Result::ERROR_OCSP_OLD_RESPONSE will be
// returned for an expired response.
//
// The optional parameter thisUpdate will be the thisUpdate value of
// the encoded response if it is considered trustworthy. Only
// good, unknown, or revoked responses that verify correctly are considered
// trustworthy. If the response is not trustworthy, thisUpdate will be 0.
// Similarly, the optional parameter validThrough will be the time through
// which the encoded response is considered trustworthy (that is, as long as
// the given time at which to validate is less than or equal to validThrough,
// the response will be considered trustworthy).
Result VerifyEncodedOCSPResponse(
TrustDomain& trustDomain, const CertID& certID, Time time,
uint16_t maxLifetimeInDays, Input encodedResponse,
/* out */ bool& expired,
/* optional out */ Time* thisUpdate = nullptr,
/* optional out */ Time* validThrough = nullptr);
// Check that the TLSFeature extensions in a given end-entity cert (which is
// assumed to have been already validated with BuildCertChain) are satisfied.
// The only feature which we cancurrently process a requirement for is
// status_request (OCSP stapling) so we reject any extension that specifies a
// requirement for another value. Empty extensions are also rejected.
Result CheckTLSFeaturesAreSatisfied(Input& cert,
const Input* stapledOCSPResponse);
}
} // namespace mozilla::pkix
#endif // mozilla_pkix_pkix_h
|
