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
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
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
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
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
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
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 *
151 X509_get_issuer_name(const X509 *a)
152 {
153 	return (a->cert_info->issuer);
154 }
155 
156 unsigned long
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
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 *
171 X509_get_subject_name(const X509 *a)
172 {
173 	return (a->cert_info->subject);
174 }
175 
176 ASN1_INTEGER *
177 X509_get_serialNumber(X509 *a)
178 {
179 	return (a->cert_info->serialNumber);
180 }
181 
182 const ASN1_INTEGER *
183 X509_get0_serialNumber(const X509 *a)
184 {
185 	return (a->cert_info->serialNumber);
186 }
187 
188 unsigned long
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
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
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
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
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
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 *
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 *
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 *
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 *
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 *
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
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  */
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