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1/* $OpenBSD: ct_local.h,v 1.8 2021/12/20 17:19:19 jsing Exp $ */
2/*
3 * Written by Rob Percival (robpercival@google.com) for the OpenSSL project.
4 */
5/* ====================================================================
6 * Copyright (c) 2016 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 */
53
54#include <stddef.h>
55
56#include <openssl/ct.h>
57#include <openssl/evp.h>
58#include <openssl/safestack.h>
59#include <openssl/x509.h>
60#include <openssl/x509v3.h>
61
62#include "bytestring.h"
63
64/* Number of bytes in an SCT v1 LogID - see RFC 6962 section 3.2. */
65#define CT_V1_LOG_ID_LEN 32
66
67/* Maximum size of an SCT - see RFC 6962 section 3.3. */
68#define MAX_SCT_SIZE 65535
69#define MAX_SCT_LIST_SIZE MAX_SCT_SIZE
70
71/*
72 * Macros to write integers in network-byte order.
73 */
74
75#define s2n(s,c) ((c[0]=(unsigned char)(((s)>> 8)&0xff), \
76 c[1]=(unsigned char)(((s) )&0xff)),c+=2)
77
78#define l2n3(l,c) ((c[0]=(unsigned char)(((l)>>16)&0xff), \
79 c[1]=(unsigned char)(((l)>> 8)&0xff), \
80 c[2]=(unsigned char)(((l) )&0xff)),c+=3)
81
82#define l2n8(l,c) (*((c)++)=(unsigned char)(((l)>>56)&0xff), \
83 *((c)++)=(unsigned char)(((l)>>48)&0xff), \
84 *((c)++)=(unsigned char)(((l)>>40)&0xff), \
85 *((c)++)=(unsigned char)(((l)>>32)&0xff), \
86 *((c)++)=(unsigned char)(((l)>>24)&0xff), \
87 *((c)++)=(unsigned char)(((l)>>16)&0xff), \
88 *((c)++)=(unsigned char)(((l)>> 8)&0xff), \
89 *((c)++)=(unsigned char)(((l) )&0xff))
90
91/* Signed Certificate Timestamp */
92struct sct_st {
93 sct_version_t version;
94 /* If version is not SCT_VERSION_V1, this contains the encoded SCT */
95 unsigned char *sct;
96 size_t sct_len;
97 /*
98 * If version is SCT_VERSION_V1, fields below contain components of
99 * the SCT
100 */
101 unsigned char *log_id;
102 size_t log_id_len;
103 /*
104 * Note, we cannot distinguish between an unset timestamp, and one
105 * that is set to 0. However since CT didn't exist in 1970, no real
106 * SCT should ever be set as such.
107 */
108 uint64_t timestamp;
109 unsigned char *ext;
110 size_t ext_len;
111 unsigned char hash_alg;
112 unsigned char sig_alg;
113 unsigned char *sig;
114 size_t sig_len;
115 /* Log entry type */
116 ct_log_entry_type_t entry_type;
117 /* Where this SCT was found, e.g. certificate, OCSP response, etc. */
118 sct_source_t source;
119 /* The result of the last attempt to validate this SCT. */
120 sct_validation_status_t validation_status;
121};
122
123/* Miscellaneous data that is useful when verifying an SCT */
124struct sct_ctx_st {
125 /* Public key */
126 EVP_PKEY *pkey;
127 /* Hash of public key */
128 unsigned char *pkeyhash;
129 size_t pkeyhashlen;
130 /* For pre-certificate: issuer public key hash */
131 unsigned char *ihash;
132 size_t ihashlen;
133 /* certificate encoding */
134 unsigned char *certder;
135 size_t certderlen;
136 /* pre-certificate encoding */
137 unsigned char *preder;
138 size_t prederlen;
139 /*
140 * milliseconds since epoch (to check that the SCT isn't from the
141 * future)
142 */
143 uint64_t epoch_time_in_ms;
144};
145
146/* Context when evaluating whether a Certificate Transparency policy is met */
147struct ct_policy_eval_ctx_st {
148 X509 *cert;
149 X509 *issuer;
150 CTLOG_STORE *log_store;
151 /*
152 * milliseconds since epoch (to check that the SCT isn't from the
153 * future)
154 */
155 uint64_t epoch_time_in_ms;
156};
157
158/*
159 * Creates a new context for verifying an SCT.
160 */
161SCT_CTX *SCT_CTX_new(void);
162/*
163 * Deletes an SCT verification context.
164 */
165void SCT_CTX_free(SCT_CTX *sctx);
166
167/*
168 * Sets the certificate that the SCT was created for.
169 * If *cert does not have a poison extension, presigner must be NULL.
170 * If *cert does not have a poison extension, it may have a single SCT
171 * (NID_ct_precert_scts) extension.
172 * If either *cert or *presigner have an AKID (NID_authority_key_identifier)
173 * extension, both must have one.
174 * Returns 1 on success, 0 on failure.
175 */
176int SCT_CTX_set1_cert(SCT_CTX *sctx, X509 *cert, X509 *presigner);
177
178/*
179 * Sets the issuer of the certificate that the SCT was created for.
180 * This is just a convenience method to save extracting the public key and
181 * calling SCT_CTX_set1_issuer_pubkey().
182 * Issuer must not be NULL.
183 * Returns 1 on success, 0 on failure.
184 */
185int SCT_CTX_set1_issuer(SCT_CTX *sctx, const X509 *issuer);
186
187/*
188 * Sets the public key of the issuer of the certificate that the SCT was created
189 * for.
190 * The public key must not be NULL.
191 * Returns 1 on success, 0 on failure.
192 */
193int SCT_CTX_set1_issuer_pubkey(SCT_CTX *sctx, X509_PUBKEY *pubkey);
194
195/*
196 * Sets the public key of the CT log that the SCT is from.
197 * Returns 1 on success, 0 on failure.
198 */
199int SCT_CTX_set1_pubkey(SCT_CTX *sctx, X509_PUBKEY *pubkey);
200
201/*
202 * Sets the time to evaluate the SCT against, in milliseconds since the Unix
203 * epoch. If the SCT's timestamp is after this time, it will be interpreted as
204 * having been issued in the future. RFC6962 states that "TLS clients MUST
205 * reject SCTs whose timestamp is in the future", so an SCT will not validate
206 * in this case.
207 */
208void SCT_CTX_set_time(SCT_CTX *sctx, uint64_t time_in_ms);
209
210/*
211 * Verifies an SCT with the given context.
212 * Returns 1 if the SCT verifies successfully; any other value indicates
213 * failure. See EVP_DigestVerifyFinal() for the meaning of those values.
214 */
215int SCT_CTX_verify(const SCT_CTX *sctx, const SCT *sct);
216
217/*
218 * Does this SCT have the minimum fields populated to be usable?
219 * Returns 1 if so, 0 otherwise.
220 */
221int SCT_is_complete(const SCT *sct);
222
223/*
224 * Does this SCT have the signature-related fields populated?
225 * Returns 1 if so, 0 otherwise.
226 * This checks that the signature and hash algorithms are set to supported
227 * values and that the signature field is set.
228 */
229int SCT_signature_is_complete(const SCT *sct);
230
231/*
232 * TODO(RJPercival): Create an SCT_signature struct and make i2o_SCT_signature
233 * and o2i_SCT_signature conform to the i2d/d2i conventions.
234 */
235
236/*
237 * Serialize (to TLS format) an |sct| signature and write it to |out|.
238 * If |out| is null, no signature will be output but the length will be returned.
239 * If |out| points to a null pointer, a string will be allocated to hold the
240 * TLS-format signature. It is the responsibility of the caller to free it.
241 * If |out| points to an allocated string, the signature will be written to it.
242 * The length of the signature in TLS format will be returned.
243 */
244int i2o_SCT_signature(const SCT *sct, unsigned char **out);
245
246/*
247 * Parses an SCT signature in TLS format and populates the |sct| with it.
248 * |in| should be a pointer to a string containing the TLS-format signature.
249 * |in| will be advanced to the end of the signature if parsing succeeds.
250 * |len| should be the length of the signature in |in|.
251 * Returns the number of bytes parsed, or a negative integer if an error occurs.
252 * If an error occurs, the SCT's signature NID may be updated whilst the
253 * signature field itself remains unset.
254 */
255int o2i_SCT_signature(SCT *sct, CBS *cbs);
256
257/*
258 * Handlers for Certificate Transparency X509v3/OCSP extensions
259 */
260extern const X509V3_EXT_METHOD v3_ct_scts[3];
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