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  */
71 static const time_t SCT_CLOCK_DRIFT_TOLERANCE = 300;
72 
73 CT_POLICY_EVAL_CTX *
74 CT_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 
90 void
91 CT_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 
100 int
101 CT_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 
109 int
110 CT_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 
118 void
119 CT_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 
125 void
126 CT_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 
131 X509 *
132 CT_POLICY_EVAL_CTX_get0_cert(const CT_POLICY_EVAL_CTX *ctx)
133 {
134 	return ctx->cert;
135 }
136 
137 X509 *
138 CT_POLICY_EVAL_CTX_get0_issuer(const CT_POLICY_EVAL_CTX *ctx)
139 {
140 	return ctx->issuer;
141 }
142 
143 const CTLOG_STORE *
144 CT_POLICY_EVAL_CTX_get0_log_store(const CT_POLICY_EVAL_CTX *ctx)
145 {
146 	return ctx->log_store;
147 }
148 
149 uint64_t
150 CT_POLICY_EVAL_CTX_get_time(const CT_POLICY_EVAL_CTX *ctx)
151 {
152 	return ctx->epoch_time_in_ms;
153 }
154