ct_policy.c revision 1.5 
1/*	$OpenBSD: ct_policy.c,v 1.5 2021/12/18 16:34:52 tb Exp $ */
2/*
3 * Implementations of Certificate Transparency SCT policies.
4 * Written by Rob Percival (robpercival@google.com) for the OpenSSL project.
5 */
6/* ====================================================================
7 * Copyright (c) 2016 The OpenSSL Project.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in
18 *    the documentation and/or other materials provided with the
19 *    distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 *    software must display the following acknowledgment:
23 *    "This product includes software developed by the OpenSSL Project
24 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 *    endorse or promote products derived from this software without
28 *    prior written permission. For written permission, please contact
29 *    licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 *    nor may "OpenSSL" appear in their names without prior written
33 *    permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 *    acknowledgment:
37 *    "This product includes software developed by the OpenSSL Project
38 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 */
54
55#ifdef OPENSSL_NO_CT
56# error "CT is disabled"
57#endif
58
59#include <openssl/ct.h>
60#include <openssl/err.h>
61#include <time.h>
62
63#include "ct_local.h"
64
65/*
66 * Number of seconds in the future that an SCT timestamp can be, by default,
67 * without being considered invalid. This is added to time() when setting a
68 * default value for CT_POLICY_EVAL_CTX.epoch_time_in_ms.
69 * It can be overridden by calling CT_POLICY_EVAL_CTX_set_time().
70 */
71static const time_t SCT_CLOCK_DRIFT_TOLERANCE = 300;
72
73CT_POLICY_EVAL_CTX *
74CT_POLICY_EVAL_CTX_new(void)
75{
76	CT_POLICY_EVAL_CTX *ctx = calloc(1, sizeof(CT_POLICY_EVAL_CTX));
77
78	if (ctx == NULL) {
79		CTerror(ERR_R_MALLOC_FAILURE);
80		return NULL;
81	}
82
83	/* time(NULL) shouldn't ever fail, so don't bother checking for -1. */
84	ctx->epoch_time_in_ms = (uint64_t)(time(NULL) + SCT_CLOCK_DRIFT_TOLERANCE) *
85            1000;
86
87	return ctx;
88}
89
90void
91CT_POLICY_EVAL_CTX_free(CT_POLICY_EVAL_CTX *ctx)
92{
93	if (ctx == NULL)
94		return;
95	X509_free(ctx->cert);
96	X509_free(ctx->issuer);
97	free(ctx);
98}
99
100int
101CT_POLICY_EVAL_CTX_set1_cert(CT_POLICY_EVAL_CTX *ctx, X509 *cert)
102{
103	if (!X509_up_ref(cert))
104		return 0;
105	ctx->cert = cert;
106	return 1;
107}
108
109int
110CT_POLICY_EVAL_CTX_set1_issuer(CT_POLICY_EVAL_CTX *ctx, X509 *issuer)
111{
112	if (!X509_up_ref(issuer))
113		return 0;
114	ctx->issuer = issuer;
115	return 1;
116}
117
118void
119CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE(CT_POLICY_EVAL_CTX *ctx,
120    CTLOG_STORE *log_store)
121{
122	ctx->log_store = log_store;
123}
124
125void
126CT_POLICY_EVAL_CTX_set_time(CT_POLICY_EVAL_CTX *ctx, uint64_t time_in_ms)
127{
128	ctx->epoch_time_in_ms = time_in_ms;
129}
130
131X509 *
132CT_POLICY_EVAL_CTX_get0_cert(const CT_POLICY_EVAL_CTX *ctx)
133{
134	return ctx->cert;
135}
136
137X509 *
138CT_POLICY_EVAL_CTX_get0_issuer(const CT_POLICY_EVAL_CTX *ctx)
139{
140	return ctx->issuer;
141}
142
143const CTLOG_STORE *
144CT_POLICY_EVAL_CTX_get0_log_store(const CT_POLICY_EVAL_CTX *ctx)
145{
146	return ctx->log_store;
147}
148
149uint64_t
150CT_POLICY_EVAL_CTX_get_time(const CT_POLICY_EVAL_CTX *ctx)
151{
152	return ctx->epoch_time_in_ms;
153}
154