1 /* $OpenBSD: x509_cmp.c,v 1.39 2022/02/24 22:05:06 beck Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <ctype.h>
60 #include <stdio.h>
61 #include <string.h>
62
63 #include <openssl/opensslconf.h>
64
65 #include <openssl/asn1.h>
66 #include <openssl/err.h>
67 #include <openssl/objects.h>
68 #include <openssl/x509.h>
69 #include <openssl/x509v3.h>
70
71 #include "evp_locl.h"
72 #include "x509_lcl.h"
73
74 int
X509_issuer_and_serial_cmp(const X509 * a,const X509 * b)75 X509_issuer_and_serial_cmp(const X509 *a, const X509 *b)
76 {
77 int i;
78 X509_CINF *ai, *bi;
79
80 ai = a->cert_info;
81 bi = b->cert_info;
82 i = ASN1_INTEGER_cmp(ai->serialNumber, bi->serialNumber);
83 if (i)
84 return (i);
85 return (X509_NAME_cmp(ai->issuer, bi->issuer));
86 }
87
88 #ifndef OPENSSL_NO_MD5
89 unsigned long
X509_issuer_and_serial_hash(X509 * a)90 X509_issuer_and_serial_hash(X509 *a)
91 {
92 unsigned long ret = 0;
93 EVP_MD_CTX ctx;
94 unsigned char md[16];
95 char *f;
96
97 EVP_MD_CTX_init(&ctx);
98 f = X509_NAME_oneline(a->cert_info->issuer, NULL, 0);
99 if (f == NULL)
100 goto err;
101 if (!EVP_DigestInit_ex(&ctx, EVP_md5(), NULL))
102 goto err;
103 if (!EVP_DigestUpdate(&ctx, (unsigned char *)f, strlen(f)))
104 goto err;
105 free(f);
106 f = NULL;
107 if (!EVP_DigestUpdate(&ctx,
108 (unsigned char *)a->cert_info->serialNumber->data,
109 (unsigned long)a->cert_info->serialNumber->length))
110 goto err;
111 if (!EVP_DigestFinal_ex(&ctx, &(md[0]), NULL))
112 goto err;
113 ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) |
114 ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)) &
115 0xffffffffL;
116
117 err:
118 EVP_MD_CTX_cleanup(&ctx);
119 free(f);
120 return (ret);
121 }
122 #endif
123
124 int
X509_issuer_name_cmp(const X509 * a,const X509 * b)125 X509_issuer_name_cmp(const X509 *a, const X509 *b)
126 {
127 return (X509_NAME_cmp(a->cert_info->issuer, b->cert_info->issuer));
128 }
129
130 int
X509_subject_name_cmp(const X509 * a,const X509 * b)131 X509_subject_name_cmp(const X509 *a, const X509 *b)
132 {
133 return (X509_NAME_cmp(a->cert_info->subject, b->cert_info->subject));
134 }
135
136 int
X509_CRL_cmp(const X509_CRL * a,const X509_CRL * b)137 X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b)
138 {
139 return (X509_NAME_cmp(a->crl->issuer, b->crl->issuer));
140 }
141
142 #ifndef OPENSSL_NO_SHA
143 int
X509_CRL_match(const X509_CRL * a,const X509_CRL * b)144 X509_CRL_match(const X509_CRL *a, const X509_CRL *b)
145 {
146 return memcmp(a->hash, b->hash, X509_CRL_HASH_LEN);
147 }
148 #endif
149
150 X509_NAME *
X509_get_issuer_name(const X509 * a)151 X509_get_issuer_name(const X509 *a)
152 {
153 return (a->cert_info->issuer);
154 }
155
156 unsigned long
X509_issuer_name_hash(X509 * x)157 X509_issuer_name_hash(X509 *x)
158 {
159 return (X509_NAME_hash(x->cert_info->issuer));
160 }
161
162 #ifndef OPENSSL_NO_MD5
163 unsigned long
X509_issuer_name_hash_old(X509 * x)164 X509_issuer_name_hash_old(X509 *x)
165 {
166 return (X509_NAME_hash_old(x->cert_info->issuer));
167 }
168 #endif
169
170 X509_NAME *
X509_get_subject_name(const X509 * a)171 X509_get_subject_name(const X509 *a)
172 {
173 return (a->cert_info->subject);
174 }
175
176 ASN1_INTEGER *
X509_get_serialNumber(X509 * a)177 X509_get_serialNumber(X509 *a)
178 {
179 return (a->cert_info->serialNumber);
180 }
181
182 const ASN1_INTEGER *
X509_get0_serialNumber(const X509 * a)183 X509_get0_serialNumber(const X509 *a)
184 {
185 return (a->cert_info->serialNumber);
186 }
187
188 unsigned long
X509_subject_name_hash(X509 * x)189 X509_subject_name_hash(X509 *x)
190 {
191 return (X509_NAME_hash(x->cert_info->subject));
192 }
193
194 #ifndef OPENSSL_NO_MD5
195 unsigned long
X509_subject_name_hash_old(X509 * x)196 X509_subject_name_hash_old(X509 *x)
197 {
198 return (X509_NAME_hash_old(x->cert_info->subject));
199 }
200 #endif
201
202 #ifndef OPENSSL_NO_SHA
203 /* Compare two certificates: they must be identical for
204 * this to work. NB: Although "cmp" operations are generally
205 * prototyped to take "const" arguments (eg. for use in
206 * STACKs), the way X509 handling is - these operations may
207 * involve ensuring the hashes are up-to-date and ensuring
208 * certain cert information is cached. So this is the point
209 * where the "depth-first" constification tree has to halt
210 * with an evil cast.
211 */
212 int
X509_cmp(const X509 * a,const X509 * b)213 X509_cmp(const X509 *a, const X509 *b)
214 {
215 /* ensure hash is valid */
216 X509_check_purpose((X509 *)a, -1, 0);
217 X509_check_purpose((X509 *)b, -1, 0);
218
219 return memcmp(a->hash, b->hash, X509_CERT_HASH_LEN);
220 }
221 #endif
222
223 int
X509_NAME_cmp(const X509_NAME * a,const X509_NAME * b)224 X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b)
225 {
226 int ret;
227
228 /* Ensure canonical encoding is present and up to date */
229 if (!a->canon_enc || a->modified) {
230 ret = i2d_X509_NAME((X509_NAME *)a, NULL);
231 if (ret < 0)
232 return -2;
233 }
234 if (!b->canon_enc || b->modified) {
235 ret = i2d_X509_NAME((X509_NAME *)b, NULL);
236 if (ret < 0)
237 return -2;
238 }
239 ret = a->canon_enclen - b->canon_enclen;
240 if (ret)
241 return ret;
242 return memcmp(a->canon_enc, b->canon_enc, a->canon_enclen);
243 }
244
245 unsigned long
X509_NAME_hash(X509_NAME * x)246 X509_NAME_hash(X509_NAME *x)
247 {
248 unsigned long ret = 0;
249 unsigned char md[SHA_DIGEST_LENGTH];
250
251 /* Make sure X509_NAME structure contains valid cached encoding */
252 i2d_X509_NAME(x, NULL);
253 if (!EVP_Digest(x->canon_enc, x->canon_enclen, md, NULL, EVP_sha1(),
254 NULL))
255 return 0;
256
257 ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) |
258 ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)) &
259 0xffffffffL;
260 return (ret);
261 }
262
263
264 #ifndef OPENSSL_NO_MD5
265 /* I now DER encode the name and hash it. Since I cache the DER encoding,
266 * this is reasonably efficient. */
267
268 unsigned long
X509_NAME_hash_old(X509_NAME * x)269 X509_NAME_hash_old(X509_NAME *x)
270 {
271 EVP_MD_CTX md_ctx;
272 unsigned long ret = 0;
273 unsigned char md[16];
274
275 /* Make sure X509_NAME structure contains valid cached encoding */
276 i2d_X509_NAME(x, NULL);
277 EVP_MD_CTX_init(&md_ctx);
278 if (EVP_DigestInit_ex(&md_ctx, EVP_md5(), NULL) &&
279 EVP_DigestUpdate(&md_ctx, x->bytes->data, x->bytes->length) &&
280 EVP_DigestFinal_ex(&md_ctx, md, NULL))
281 ret = (((unsigned long)md[0]) |
282 ((unsigned long)md[1] << 8L) |
283 ((unsigned long)md[2] << 16L) |
284 ((unsigned long)md[3] << 24L)) &
285 0xffffffffL;
286 EVP_MD_CTX_cleanup(&md_ctx);
287
288 return (ret);
289 }
290 #endif
291
292 /* Search a stack of X509 for a match */
293 X509 *
X509_find_by_issuer_and_serial(STACK_OF (X509)* sk,X509_NAME * name,ASN1_INTEGER * serial)294 X509_find_by_issuer_and_serial(STACK_OF(X509) *sk, X509_NAME *name,
295 ASN1_INTEGER *serial)
296 {
297 int i;
298 X509_CINF cinf;
299 X509 x, *x509 = NULL;
300
301 if (!sk)
302 return NULL;
303
304 x.cert_info = &cinf;
305 cinf.serialNumber = serial;
306 cinf.issuer = name;
307
308 for (i = 0; i < sk_X509_num(sk); i++) {
309 x509 = sk_X509_value(sk, i);
310 if (X509_issuer_and_serial_cmp(x509, &x) == 0)
311 return (x509);
312 }
313 return (NULL);
314 }
315
316 X509 *
X509_find_by_subject(STACK_OF (X509)* sk,X509_NAME * name)317 X509_find_by_subject(STACK_OF(X509) *sk, X509_NAME *name)
318 {
319 X509 *x509;
320 int i;
321
322 for (i = 0; i < sk_X509_num(sk); i++) {
323 x509 = sk_X509_value(sk, i);
324 if (X509_NAME_cmp(X509_get_subject_name(x509), name) == 0)
325 return (x509);
326 }
327 return (NULL);
328 }
329
330 EVP_PKEY *
X509_get_pubkey(X509 * x)331 X509_get_pubkey(X509 *x)
332 {
333 if (x == NULL || x->cert_info == NULL)
334 return (NULL);
335 return (X509_PUBKEY_get(x->cert_info->key));
336 }
337
338 EVP_PKEY *
X509_get0_pubkey(const X509 * x)339 X509_get0_pubkey(const X509 *x)
340 {
341 if (x == NULL || x->cert_info == NULL)
342 return (NULL);
343 return (X509_PUBKEY_get0(x->cert_info->key));
344 }
345
346 ASN1_BIT_STRING *
X509_get0_pubkey_bitstr(const X509 * x)347 X509_get0_pubkey_bitstr(const X509 *x)
348 {
349 if (!x)
350 return NULL;
351 return x->cert_info->key->public_key;
352 }
353
354 int
X509_check_private_key(const X509 * x,const EVP_PKEY * k)355 X509_check_private_key(const X509 *x, const EVP_PKEY *k)
356 {
357 const EVP_PKEY *xk;
358 int ret;
359
360 xk = X509_get0_pubkey(x);
361
362 if (xk)
363 ret = EVP_PKEY_cmp(xk, k);
364 else
365 ret = -2;
366
367 switch (ret) {
368 case 1:
369 break;
370 case 0:
371 X509error(X509_R_KEY_VALUES_MISMATCH);
372 break;
373 case -1:
374 X509error(X509_R_KEY_TYPE_MISMATCH);
375 break;
376 case -2:
377 X509error(X509_R_UNKNOWN_KEY_TYPE);
378 }
379 if (ret > 0)
380 return 1;
381 return 0;
382 }
383
384 /*
385 * Not strictly speaking an "up_ref" as a STACK doesn't have a reference
386 * count but it has the same effect by duping the STACK and upping the ref of
387 * each X509 structure.
388 */
STACK_OF(X509)389 STACK_OF(X509) *
390 X509_chain_up_ref(STACK_OF(X509) *chain)
391 {
392 STACK_OF(X509) *ret;
393 size_t i;
394
395 ret = sk_X509_dup(chain);
396 for (i = 0; i < sk_X509_num(ret); i++)
397 X509_up_ref(sk_X509_value(ret, i));
398
399 return ret;
400 }
401