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1 files changed, 1387 insertions, 0 deletions
diff --git a/src/lib/libcrypto/x509/x509_utl.c b/src/lib/libcrypto/x509/x509_utl.c
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1/* $OpenBSD: x509_utl.c,v 1.1 2020/06/04 15:19:32 jsing Exp $ */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project.
4 */
5/* ====================================================================
6 * Copyright (c) 1999-2003 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 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58/* X509 v3 extension utilities */
59
60#include <ctype.h>
61#include <stdio.h>
62#include <string.h>
63
64#include <openssl/bn.h>
65#include <openssl/conf.h>
66#include <openssl/err.h>
67#include <openssl/x509v3.h>
68
69char *bn_to_string(const BIGNUM *bn);
70static char *strip_spaces(char *name);
71static int sk_strcmp(const char * const *a, const char * const *b);
72static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
73 GENERAL_NAMES *gens);
74static void str_free(OPENSSL_STRING str);
75static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email);
76
77static int ipv4_from_asc(unsigned char *v4, const char *in);
78static int ipv6_from_asc(unsigned char *v6, const char *in);
79static int ipv6_cb(const char *elem, int len, void *usr);
80static int ipv6_hex(unsigned char *out, const char *in, int inlen);
81
82/* Add a CONF_VALUE name-value pair to stack. */
83int
84X509V3_add_value(const char *name, const char *value,
85 STACK_OF(CONF_VALUE) **extlist)
86{
87 CONF_VALUE *vtmp = NULL;
88 STACK_OF(CONF_VALUE) *free_exts = NULL;
89
90 if ((vtmp = calloc(1, sizeof(CONF_VALUE))) == NULL)
91 goto err;
92 if (name != NULL) {
93 if ((vtmp->name = strdup(name)) == NULL)
94 goto err;
95 }
96 if (value != NULL) {
97 if ((vtmp->value = strdup(value)) == NULL)
98 goto err;
99 }
100
101 if (*extlist == NULL) {
102 if ((free_exts = *extlist = sk_CONF_VALUE_new_null()) == NULL)
103 goto err;
104 }
105
106 if (!sk_CONF_VALUE_push(*extlist, vtmp))
107 goto err;
108
109 return 1;
110
111 err:
112 X509V3error(ERR_R_MALLOC_FAILURE);
113 X509V3_conf_free(vtmp);
114 if (free_exts != NULL) {
115 sk_CONF_VALUE_free(*extlist);
116 *extlist = NULL;
117 }
118 return 0;
119}
120
121int
122X509V3_add_value_uchar(const char *name, const unsigned char *value,
123 STACK_OF(CONF_VALUE) **extlist)
124{
125 return X509V3_add_value(name, (const char *)value, extlist);
126}
127
128/* Free function for STACK_OF(CONF_VALUE) */
129
130void
131X509V3_conf_free(CONF_VALUE *conf)
132{
133 if (!conf)
134 return;
135 free(conf->name);
136 free(conf->value);
137 free(conf->section);
138 free(conf);
139}
140
141int
142X509V3_add_value_bool(const char *name, int asn1_bool,
143 STACK_OF(CONF_VALUE) **extlist)
144{
145 if (asn1_bool)
146 return X509V3_add_value(name, "TRUE", extlist);
147 return X509V3_add_value(name, "FALSE", extlist);
148}
149
150int
151X509V3_add_value_bool_nf(const char *name, int asn1_bool,
152 STACK_OF(CONF_VALUE) **extlist)
153{
154 if (asn1_bool)
155 return X509V3_add_value(name, "TRUE", extlist);
156 return 1;
157}
158
159char *
160bn_to_string(const BIGNUM *bn)
161{
162 const char *sign = "";
163 char *bnstr, *hex;
164 char *ret = NULL;
165
166 /* Only display small numbers in decimal, as conversion is quadratic. */
167 if (BN_num_bits(bn) < 128)
168 return BN_bn2dec(bn);
169
170 if ((hex = bnstr = BN_bn2hex(bn)) == NULL)
171 goto err;
172
173 if (BN_is_negative(bn)) {
174 sign = "-";
175 hex++;
176 }
177
178 if (asprintf(&ret, "%s0x%s", sign, hex) == -1)
179 ret = NULL;
180
181 err:
182 free(bnstr);
183 return ret;
184}
185
186char *
187i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, const ASN1_ENUMERATED *a)
188{
189 BIGNUM *bntmp;
190 char *strtmp = NULL;
191
192 if (a == NULL)
193 return NULL;
194 if ((bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) == NULL ||
195 (strtmp = bn_to_string(bntmp)) == NULL)
196 X509V3error(ERR_R_MALLOC_FAILURE);
197 BN_free(bntmp);
198 return strtmp;
199}
200
201char *
202i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, const ASN1_INTEGER *a)
203{
204 BIGNUM *bntmp;
205 char *strtmp = NULL;
206
207 if (a == NULL)
208 return NULL;
209 if ((bntmp = ASN1_INTEGER_to_BN(a, NULL)) == NULL ||
210 (strtmp = bn_to_string(bntmp)) == NULL)
211 X509V3error(ERR_R_MALLOC_FAILURE);
212 BN_free(bntmp);
213 return strtmp;
214}
215
216ASN1_INTEGER *
217s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, const char *value)
218{
219 BIGNUM *bn = NULL;
220 ASN1_INTEGER *aint;
221 int isneg, ishex;
222 int ret;
223
224 if (!value) {
225 X509V3error(X509V3_R_INVALID_NULL_VALUE);
226 return 0;
227 }
228 bn = BN_new();
229 if (value[0] == '-') {
230 value++;
231 isneg = 1;
232 } else
233 isneg = 0;
234
235 if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) {
236 value += 2;
237 ishex = 1;
238 } else
239 ishex = 0;
240
241 if (ishex)
242 ret = BN_hex2bn(&bn, value);
243 else
244 ret = BN_dec2bn(&bn, value);
245
246 if (!ret || value[ret]) {
247 BN_free(bn);
248 X509V3error(X509V3_R_BN_DEC2BN_ERROR);
249 return 0;
250 }
251
252 if (isneg && BN_is_zero(bn))
253 isneg = 0;
254
255 aint = BN_to_ASN1_INTEGER(bn, NULL);
256 BN_free(bn);
257 if (!aint) {
258 X509V3error(X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
259 return 0;
260 }
261 if (isneg)
262 aint->type |= V_ASN1_NEG;
263 return aint;
264}
265
266int
267X509V3_add_value_int(const char *name, const ASN1_INTEGER *aint,
268 STACK_OF(CONF_VALUE) **extlist)
269{
270 char *strtmp;
271 int ret;
272
273 if (!aint)
274 return 1;
275 if (!(strtmp = i2s_ASN1_INTEGER(NULL, aint)))
276 return 0;
277 ret = X509V3_add_value(name, strtmp, extlist);
278 free(strtmp);
279 return ret;
280}
281
282int
283X509V3_get_value_bool(const CONF_VALUE *value, int *asn1_bool)
284{
285 char *btmp;
286
287 if (!(btmp = value->value))
288 goto err;
289 if (!strcmp(btmp, "TRUE") || !strcmp(btmp, "true") ||
290 !strcmp(btmp, "Y") || !strcmp(btmp, "y") ||
291 !strcmp(btmp, "YES") || !strcmp(btmp, "yes")) {
292 *asn1_bool = 0xff;
293 return 1;
294 } else if (!strcmp(btmp, "FALSE") || !strcmp(btmp, "false") ||
295 !strcmp(btmp, "N") || !strcmp(btmp, "n") ||
296 !strcmp(btmp, "NO") || !strcmp(btmp, "no")) {
297 *asn1_bool = 0;
298 return 1;
299 }
300
301 err:
302 X509V3error(X509V3_R_INVALID_BOOLEAN_STRING);
303 X509V3_conf_err(value);
304 return 0;
305}
306
307int
308X509V3_get_value_int(const CONF_VALUE *value, ASN1_INTEGER **aint)
309{
310 ASN1_INTEGER *itmp;
311
312 if (!(itmp = s2i_ASN1_INTEGER(NULL, value->value))) {
313 X509V3_conf_err(value);
314 return 0;
315 }
316 *aint = itmp;
317 return 1;
318}
319
320#define HDR_NAME 1
321#define HDR_VALUE 2
322
323/*#define DEBUG*/
324
325STACK_OF(CONF_VALUE) *
326X509V3_parse_list(const char *line)
327{
328 char *p, *q, c;
329 char *ntmp, *vtmp;
330 STACK_OF(CONF_VALUE) *values = NULL;
331 char *linebuf;
332 int state;
333
334 /* We are going to modify the line so copy it first */
335 if ((linebuf = strdup(line)) == NULL) {
336 X509V3error(ERR_R_MALLOC_FAILURE);
337 goto err;
338 }
339 state = HDR_NAME;
340 ntmp = NULL;
341
342 /* Go through all characters */
343 for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') &&
344 (c != '\n'); p++) {
345
346 switch (state) {
347 case HDR_NAME:
348 if (c == ':') {
349 state = HDR_VALUE;
350 *p = 0;
351 ntmp = strip_spaces(q);
352 if (!ntmp) {
353 X509V3error(X509V3_R_INVALID_NULL_NAME);
354 goto err;
355 }
356 q = p + 1;
357 } else if (c == ',') {
358 *p = 0;
359 ntmp = strip_spaces(q);
360 q = p + 1;
361 if (!ntmp) {
362 X509V3error(X509V3_R_INVALID_NULL_NAME);
363 goto err;
364 }
365 X509V3_add_value(ntmp, NULL, &values);
366 }
367 break;
368
369 case HDR_VALUE:
370 if (c == ',') {
371 state = HDR_NAME;
372 *p = 0;
373 vtmp = strip_spaces(q);
374 if (!vtmp) {
375 X509V3error(X509V3_R_INVALID_NULL_VALUE);
376 goto err;
377 }
378 X509V3_add_value(ntmp, vtmp, &values);
379 ntmp = NULL;
380 q = p + 1;
381 }
382
383 }
384 }
385
386 if (state == HDR_VALUE) {
387 vtmp = strip_spaces(q);
388 if (!vtmp) {
389 X509V3error(X509V3_R_INVALID_NULL_VALUE);
390 goto err;
391 }
392 X509V3_add_value(ntmp, vtmp, &values);
393 } else {
394 ntmp = strip_spaces(q);
395 if (!ntmp) {
396 X509V3error(X509V3_R_INVALID_NULL_NAME);
397 goto err;
398 }
399 X509V3_add_value(ntmp, NULL, &values);
400 }
401 free(linebuf);
402 return values;
403
404 err:
405 free(linebuf);
406 sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
407 return NULL;
408
409}
410
411/* Delete leading and trailing spaces from a string */
412static char *
413strip_spaces(char *name)
414{
415 char *p, *q;
416
417 /* Skip over leading spaces */
418 p = name;
419 while (*p && isspace((unsigned char)*p))
420 p++;
421 if (!*p)
422 return NULL;
423 q = p + strlen(p) - 1;
424 while ((q != p) && isspace((unsigned char)*q))
425 q--;
426 if (p != q)
427 q[1] = 0;
428 if (!*p)
429 return NULL;
430 return p;
431}
432
433/* hex string utilities */
434
435/* Given a buffer of length 'len' return a malloc'ed string with its
436 * hex representation
437 */
438char *
439hex_to_string(const unsigned char *buffer, long len)
440{
441 char *tmp, *q;
442 const unsigned char *p;
443 int i;
444 static const char hexdig[] = "0123456789ABCDEF";
445
446 if (!buffer || !len)
447 return NULL;
448 if (!(tmp = malloc(len * 3 + 1))) {
449 X509V3error(ERR_R_MALLOC_FAILURE);
450 return NULL;
451 }
452 q = tmp;
453 for (i = 0, p = buffer; i < len; i++, p++) {
454 *q++ = hexdig[(*p >> 4) & 0xf];
455 *q++ = hexdig[*p & 0xf];
456 *q++ = ':';
457 }
458 q[-1] = 0;
459 return tmp;
460}
461
462/* Give a string of hex digits convert to
463 * a buffer
464 */
465
466unsigned char *
467string_to_hex(const char *str, long *len)
468{
469 unsigned char *hexbuf, *q;
470 unsigned char ch, cl, *p;
471 if (!str) {
472 X509V3error(X509V3_R_INVALID_NULL_ARGUMENT);
473 return NULL;
474 }
475 if (!(hexbuf = malloc(strlen(str) >> 1)))
476 goto err;
477 for (p = (unsigned char *)str, q = hexbuf; *p; ) {
478 ch = *p++;
479 if (ch == ':')
480 continue;
481 cl = *p++;
482 if (!cl) {
483 X509V3error(X509V3_R_ODD_NUMBER_OF_DIGITS);
484 free(hexbuf);
485 return NULL;
486 }
487 ch = tolower(ch);
488 cl = tolower(cl);
489
490 if ((ch >= '0') && (ch <= '9'))
491 ch -= '0';
492 else if ((ch >= 'a') && (ch <= 'f'))
493 ch -= 'a' - 10;
494 else
495 goto badhex;
496
497 if ((cl >= '0') && (cl <= '9'))
498 cl -= '0';
499 else if ((cl >= 'a') && (cl <= 'f'))
500 cl -= 'a' - 10;
501 else
502 goto badhex;
503
504 *q++ = (ch << 4) | cl;
505 }
506
507 if (len)
508 *len = q - hexbuf;
509
510 return hexbuf;
511
512 err:
513 free(hexbuf);
514 X509V3error(ERR_R_MALLOC_FAILURE);
515 return NULL;
516
517 badhex:
518 free(hexbuf);
519 X509V3error(X509V3_R_ILLEGAL_HEX_DIGIT);
520 return NULL;
521}
522
523/* V2I name comparison function: returns zero if 'name' matches
524 * cmp or cmp.*
525 */
526
527int
528name_cmp(const char *name, const char *cmp)
529{
530 int len, ret;
531 char c;
532
533 len = strlen(cmp);
534 if ((ret = strncmp(name, cmp, len)))
535 return ret;
536 c = name[len];
537 if (!c || (c=='.'))
538 return 0;
539 return 1;
540}
541
542static int
543sk_strcmp(const char * const *a, const char * const *b)
544{
545 return strcmp(*a, *b);
546}
547
548STACK_OF(OPENSSL_STRING) *
549X509_get1_email(X509 *x)
550{
551 GENERAL_NAMES *gens;
552 STACK_OF(OPENSSL_STRING) *ret;
553
554 gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
555 ret = get_email(X509_get_subject_name(x), gens);
556 sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
557 return ret;
558}
559
560STACK_OF(OPENSSL_STRING) *
561X509_get1_ocsp(X509 *x)
562{
563 AUTHORITY_INFO_ACCESS *info;
564 STACK_OF(OPENSSL_STRING) *ret = NULL;
565 int i;
566
567 info = X509_get_ext_d2i(x, NID_info_access, NULL, NULL);
568 if (!info)
569 return NULL;
570 for (i = 0; i < sk_ACCESS_DESCRIPTION_num(info); i++) {
571 ACCESS_DESCRIPTION *ad = sk_ACCESS_DESCRIPTION_value(info, i);
572 if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
573 if (ad->location->type == GEN_URI) {
574 if (!append_ia5(&ret,
575 ad->location->d.uniformResourceIdentifier))
576 break;
577 }
578 }
579 }
580 AUTHORITY_INFO_ACCESS_free(info);
581 return ret;
582}
583
584STACK_OF(OPENSSL_STRING) *
585X509_REQ_get1_email(X509_REQ *x)
586{
587 GENERAL_NAMES *gens;
588 STACK_OF(X509_EXTENSION) *exts;
589 STACK_OF(OPENSSL_STRING) *ret;
590
591 exts = X509_REQ_get_extensions(x);
592 gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);
593 ret = get_email(X509_REQ_get_subject_name(x), gens);
594 sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
595 sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
596 return ret;
597}
598
599
600static STACK_OF(OPENSSL_STRING) *
601get_email(X509_NAME *name, GENERAL_NAMES *gens)
602{
603 STACK_OF(OPENSSL_STRING) *ret = NULL;
604 X509_NAME_ENTRY *ne;
605 ASN1_IA5STRING *email;
606 GENERAL_NAME *gen;
607 int i;
608
609 /* Now add any email address(es) to STACK */
610 i = -1;
611
612 /* First supplied X509_NAME */
613 while ((i = X509_NAME_get_index_by_NID(name,
614 NID_pkcs9_emailAddress, i)) >= 0) {
615 ne = X509_NAME_get_entry(name, i);
616 email = X509_NAME_ENTRY_get_data(ne);
617 if (!append_ia5(&ret, email))
618 return NULL;
619 }
620 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
621 gen = sk_GENERAL_NAME_value(gens, i);
622 if (gen->type != GEN_EMAIL)
623 continue;
624 if (!append_ia5(&ret, gen->d.ia5))
625 return NULL;
626 }
627 return ret;
628}
629
630static void
631str_free(OPENSSL_STRING str)
632{
633 free(str);
634}
635
636static int
637append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email)
638{
639 char *emtmp;
640
641 /* First some sanity checks */
642 if (email->type != V_ASN1_IA5STRING)
643 return 1;
644 if (!email->data || !email->length)
645 return 1;
646 if (!*sk)
647 *sk = sk_OPENSSL_STRING_new(sk_strcmp);
648 if (!*sk)
649 return 0;
650 /* Don't add duplicates */
651 if (sk_OPENSSL_STRING_find(*sk, (char *)email->data) != -1)
652 return 1;
653 emtmp = strdup((char *)email->data);
654 if (!emtmp || !sk_OPENSSL_STRING_push(*sk, emtmp)) {
655 X509_email_free(*sk);
656 *sk = NULL;
657 return 0;
658 }
659 return 1;
660}
661
662void
663X509_email_free(STACK_OF(OPENSSL_STRING) *sk)
664{
665 sk_OPENSSL_STRING_pop_free(sk, str_free);
666}
667
668typedef int (*equal_fn)(const unsigned char *pattern, size_t pattern_len,
669 const unsigned char *subject, size_t subject_len, unsigned int flags);
670
671/* Skip pattern prefix to match "wildcard" subject */
672static void
673skip_prefix(const unsigned char **p, size_t *plen, const unsigned char *subject,
674 size_t subject_len, unsigned int flags)
675{
676 const unsigned char *pattern = *p;
677 size_t pattern_len = *plen;
678
679 /*
680 * If subject starts with a leading '.' followed by more octets, and
681 * pattern is longer, compare just an equal-length suffix with the
682 * full subject (starting at the '.'), provided the prefix contains
683 * no NULs.
684 */
685 if ((flags & _X509_CHECK_FLAG_DOT_SUBDOMAINS) == 0)
686 return;
687
688 while (pattern_len > subject_len && *pattern) {
689 if ((flags & X509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS) &&
690 *pattern == '.')
691 break;
692 ++pattern;
693 --pattern_len;
694 }
695
696 /* Skip if entire prefix acceptable */
697 if (pattern_len == subject_len) {
698 *p = pattern;
699 *plen = pattern_len;
700 }
701}
702
703/*
704 * Open/BoringSSL uses memcmp for "equal_case" while their
705 * "equal_nocase" function is a hand-rolled strncasecmp that does not
706 * allow \0 in the pattern. Since an embedded \0 is likely a sign of
707 * problems, we simply don't allow it in either case, and then we use
708 * standard libc funcitons.
709 */
710
711/* Compare using strncasecmp */
712static int
713equal_nocase(const unsigned char *pattern, size_t pattern_len,
714 const unsigned char *subject, size_t subject_len, unsigned int flags)
715{
716 if (memchr(pattern, '\0', pattern_len) != NULL)
717 return 0;
718 if (memchr(subject, '\0', subject_len) != NULL)
719 return 0;
720 skip_prefix(&pattern, &pattern_len, subject, subject_len, flags);
721 if (pattern_len != subject_len)
722 return 0;
723 return (strncasecmp(pattern, subject, pattern_len) == 0);
724}
725
726/* Compare using strncmp. */
727static int
728equal_case(const unsigned char *pattern, size_t pattern_len,
729 const unsigned char *subject, size_t subject_len, unsigned int flags)
730{
731 if (memchr(pattern, 0, pattern_len) != NULL)
732 return 0;
733 if (memchr(subject, 0, subject_len) != NULL)
734 return 0;
735 skip_prefix(&pattern, &pattern_len, subject, subject_len, flags);
736 if (pattern_len != subject_len)
737 return 0;
738 return (strncmp(pattern, subject, pattern_len) == 0);
739}
740
741/*
742 * RFC 5280, section 7.5, requires that only the domain is compared in a
743 * case-insensitive manner.
744 */
745static int
746equal_email(const unsigned char *a, size_t a_len, const unsigned char *b,
747 size_t b_len, unsigned int unused_flags)
748{
749 size_t pos = a_len;
750 if (a_len != b_len)
751 return 0;
752 /*
753 * We search backwards for the '@' character, so that we do not have to
754 * deal with quoted local-parts. The domain part is compared in a
755 * case-insensitive manner.
756 */
757 while (pos > 0) {
758 pos--;
759 if (a[pos] == '@' || b[pos] == '@') {
760 if (!equal_nocase(a + pos, a_len - pos, b + pos,
761 a_len - pos, 0))
762 return 0;
763 break;
764 }
765 }
766 if (pos == 0)
767 pos = a_len;
768 return equal_case(a, pos, b, pos, 0);
769}
770
771/*
772 * Compare the prefix and suffix with the subject, and check that the
773 * characters in-between are valid.
774 */
775static int
776wildcard_match(const unsigned char *prefix, size_t prefix_len,
777 const unsigned char *suffix, size_t suffix_len,
778 const unsigned char *subject, size_t subject_len, unsigned int flags)
779{
780 const unsigned char *wildcard_start;
781 const unsigned char *wildcard_end;
782 const unsigned char *p;
783 int allow_multi = 0;
784 int allow_idna = 0;
785
786 if (subject_len < prefix_len + suffix_len)
787 return 0;
788 if (!equal_nocase(prefix, prefix_len, subject, prefix_len, flags))
789 return 0;
790 wildcard_start = subject + prefix_len;
791 wildcard_end = subject + (subject_len - suffix_len);
792 if (!equal_nocase(wildcard_end, suffix_len, suffix, suffix_len, flags))
793 return 0;
794 /*
795 * If the wildcard makes up the entire first label, it must match at
796 * least one character.
797 */
798 if (prefix_len == 0 && *suffix == '.') {
799 if (wildcard_start == wildcard_end)
800 return 0;
801 allow_idna = 1;
802 if (flags & X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS)
803 allow_multi = 1;
804 }
805 /* IDNA labels cannot match partial wildcards */
806 if (!allow_idna &&
807 subject_len >= 4
808 && strncasecmp((char *)subject, "xn--", 4) == 0)
809 return 0;
810 /* The wildcard may match a literal '*' */
811 if (wildcard_end == wildcard_start + 1 && *wildcard_start == '*')
812 return 1;
813 /*
814 * Check that the part matched by the wildcard contains only
815 * permitted characters and only matches a single label unless
816 * allow_multi is set.
817 */
818 for (p = wildcard_start; p != wildcard_end; ++p)
819 if (!(('0' <= *p && *p <= '9') || ('A' <= *p && *p <= 'Z') ||
820 ('a' <= *p && *p <= 'z') || *p == '-' ||
821 (allow_multi && *p == '.')))
822 return 0;
823 return 1;
824}
825
826#define LABEL_START (1 << 0)
827#define LABEL_END (1 << 1)
828#define LABEL_HYPHEN (1 << 2)
829#define LABEL_IDNA (1 << 3)
830
831static const unsigned char *
832valid_star(const unsigned char *p, size_t len, unsigned int flags)
833{
834 const unsigned char *star = 0;
835 size_t i;
836 int state = LABEL_START;
837 int dots = 0;
838 for (i = 0; i < len; ++i) {
839 /*
840 * Locate first and only legal wildcard, either at the start
841 * or end of a non-IDNA first and not final label.
842 */
843 if (p[i] == '*') {
844 int atstart = (state & LABEL_START);
845 int atend = (i == len - 1 || p[i + 1] == '.');
846 /*
847 * At most one wildcard per pattern.
848 * No wildcards in IDNA labels.
849 * No wildcards after the first label.
850 */
851 if (star != NULL || (state & LABEL_IDNA) != 0 || dots)
852 return NULL;
853 /* Only full-label '*.example.com' wildcards? */
854 if ((flags & X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS)
855 && (!atstart || !atend))
856 return NULL;
857 /* No 'foo*bar' wildcards */
858 if (!atstart && !atend)
859 return NULL;
860 star = &p[i];
861 state &= ~LABEL_START;
862 } else if ((state & LABEL_START) != 0) {
863 /*
864 * At the start of a label, skip any "xn--" and
865 * remain in the LABEL_START state, but set the
866 * IDNA label state
867 */
868 if ((state & LABEL_IDNA) == 0 && len - i >= 4
869 && strncasecmp((char *)&p[i], "xn--", 4) == 0) {
870 i += 3;
871 state |= LABEL_IDNA;
872 continue;
873 }
874 /* Labels must start with a letter or digit */
875 state &= ~LABEL_START;
876 if (('a' <= p[i] && p[i] <= 'z')
877 || ('A' <= p[i] && p[i] <= 'Z')
878 || ('0' <= p[i] && p[i] <= '9'))
879 continue;
880 return NULL;
881 } else if (('a' <= p[i] && p[i] <= 'z')
882 || ('A' <= p[i] && p[i] <= 'Z')
883 || ('0' <= p[i] && p[i] <= '9')) {
884 state &= LABEL_IDNA;
885 continue;
886 } else if (p[i] == '.') {
887 if (state & (LABEL_HYPHEN | LABEL_START))
888 return NULL;
889 state = LABEL_START;
890 ++dots;
891 } else if (p[i] == '-') {
892 /* no domain/subdomain starts with '-' */
893 if ((state & LABEL_START) != 0)
894 return NULL;
895 state |= LABEL_HYPHEN;
896 } else
897 return NULL;
898 }
899
900 /*
901 * The final label must not end in a hyphen or ".", and
902 * there must be at least two dots after the star.
903 */
904 if ((state & (LABEL_START | LABEL_HYPHEN)) != 0 || dots < 2)
905 return NULL;
906 return star;
907}
908
909/* Compare using wildcards. */
910static int
911equal_wildcard(const unsigned char *pattern, size_t pattern_len,
912 const unsigned char *subject, size_t subject_len, unsigned int flags)
913{
914 const unsigned char *star = NULL;
915
916 /*
917 * Subject names starting with '.' can only match a wildcard pattern
918 * via a subject sub-domain pattern suffix match.
919 */
920 if (!(subject_len > 1 && subject[0] == '.'))
921 star = valid_star(pattern, pattern_len, flags);
922 if (star == NULL)
923 return equal_nocase(pattern, pattern_len,
924 subject, subject_len, flags);
925 return wildcard_match(pattern, star - pattern,
926 star + 1, (pattern + pattern_len) - star - 1,
927 subject, subject_len, flags);
928}
929
930/*
931 * Compare an ASN1_STRING to a supplied string. If they match return 1. If
932 * cmp_type > 0 only compare if string matches the type, otherwise convert it
933 * to UTF8.
934 */
935
936static int
937do_check_string(ASN1_STRING *a, int cmp_type, equal_fn equal,
938 unsigned int flags, const char *b, size_t blen, char **peername)
939{
940 int rv = 0;
941
942 if (!a->data || !a->length)
943 return 0;
944 if (cmp_type > 0) {
945 if (cmp_type != a->type)
946 return 0;
947 if (cmp_type == V_ASN1_IA5STRING)
948 rv = equal(a->data, a->length, (unsigned char *)b,
949 blen, flags);
950 else if (a->length == (int)blen && !memcmp(a->data, b, blen))
951 rv = 1;
952 if (rv > 0 && peername &&
953 (*peername = strndup((char *)a->data, a->length)) == NULL)
954 rv = -1;
955 } else {
956 int astrlen;
957 unsigned char *astr;
958 astrlen = ASN1_STRING_to_UTF8(&astr, a);
959 if (astrlen < 0)
960 return -1;
961 rv = equal(astr, astrlen, (unsigned char *)b, blen, flags);
962 if (rv > 0 && peername &&
963 (*peername = strndup((char *)astr, astrlen)) == NULL)
964 rv = -1;
965 free(astr);
966 }
967 return rv;
968}
969
970static int
971do_x509_check(X509 *x, const char *chk, size_t chklen, unsigned int flags,
972 int check_type, char **peername)
973{
974 GENERAL_NAMES *gens = NULL;
975 X509_NAME *name = NULL;
976 size_t i;
977 int j;
978 int cnid = NID_undef;
979 int alt_type;
980 int san_present = 0;
981 int rv = 0;
982 equal_fn equal;
983
984 /* See below, this flag is internal-only */
985 flags &= ~_X509_CHECK_FLAG_DOT_SUBDOMAINS;
986 if (check_type == GEN_EMAIL) {
987 cnid = NID_pkcs9_emailAddress;
988 alt_type = V_ASN1_IA5STRING;
989 equal = equal_email;
990 } else if (check_type == GEN_DNS) {
991 cnid = NID_commonName;
992 /* Implicit client-side DNS sub-domain pattern */
993 if (chklen > 1 && chk[0] == '.')
994 flags |= _X509_CHECK_FLAG_DOT_SUBDOMAINS;
995 alt_type = V_ASN1_IA5STRING;
996 if (flags & X509_CHECK_FLAG_NO_WILDCARDS)
997 equal = equal_nocase;
998 else
999 equal = equal_wildcard;
1000 } else {
1001 alt_type = V_ASN1_OCTET_STRING;
1002 equal = equal_case;
1003 }
1004
1005 gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
1006 if (gens != NULL) {
1007 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
1008 GENERAL_NAME *gen;
1009 ASN1_STRING *cstr;
1010 gen = sk_GENERAL_NAME_value(gens, i);
1011 if (gen->type != check_type)
1012 continue;
1013 san_present = 1;
1014 if (check_type == GEN_EMAIL)
1015 cstr = gen->d.rfc822Name;
1016 else if (check_type == GEN_DNS)
1017 cstr = gen->d.dNSName;
1018 else
1019 cstr = gen->d.iPAddress;
1020 /* Positive on success, negative on error! */
1021 if ((rv = do_check_string(cstr, alt_type, equal, flags,
1022 chk, chklen, peername)) != 0)
1023 break;
1024 }
1025 GENERAL_NAMES_free(gens);
1026 if (rv != 0)
1027 return rv;
1028 if (cnid == NID_undef ||
1029 (san_present &&
1030 !(flags & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT)))
1031 return 0;
1032 }
1033
1034 /* We're done if CN-ID is not pertinent */
1035 if (cnid == NID_undef)
1036 return 0;
1037
1038 j = -1;
1039 name = X509_get_subject_name(x);
1040 while ((j = X509_NAME_get_index_by_NID(name, cnid, j)) >= 0) {
1041 X509_NAME_ENTRY *ne;
1042 ASN1_STRING *str;
1043 if ((ne = X509_NAME_get_entry(name, j)) == NULL)
1044 return -1;
1045 if ((str = X509_NAME_ENTRY_get_data(ne)) == NULL)
1046 return -1;
1047 /* Positive on success, negative on error! */
1048 if ((rv = do_check_string(str, -1, equal, flags,
1049 chk, chklen, peername)) != 0)
1050 return rv;
1051 }
1052 return 0;
1053}
1054
1055int
1056X509_check_host(X509 *x, const char *chk, size_t chklen, unsigned int flags,
1057 char **peername)
1058{
1059 if (chk == NULL)
1060 return -2;
1061 if (chklen == 0)
1062 chklen = strlen(chk);
1063 else if (memchr(chk, '\0', chklen))
1064 return -2;
1065 return do_x509_check(x, chk, chklen, flags, GEN_DNS, peername);
1066}
1067
1068int
1069X509_check_email(X509 *x, const char *chk, size_t chklen, unsigned int flags)
1070{
1071 if (chk == NULL)
1072 return -2;
1073 if (chklen == 0)
1074 chklen = strlen(chk);
1075 else if (memchr(chk, '\0', chklen))
1076 return -2;
1077 return do_x509_check(x, chk, chklen, flags, GEN_EMAIL, NULL);
1078}
1079
1080int
1081X509_check_ip(X509 *x, const unsigned char *chk, size_t chklen,
1082 unsigned int flags)
1083{
1084 if (chk == NULL)
1085 return -2;
1086 return do_x509_check(x, (char *)chk, chklen, flags, GEN_IPADD, NULL);
1087}
1088
1089int
1090X509_check_ip_asc(X509 *x, const char *ipasc, unsigned int flags)
1091{
1092 unsigned char ipout[16];
1093 size_t iplen;
1094
1095 if (ipasc == NULL)
1096 return -2;
1097 iplen = (size_t)a2i_ipadd(ipout, ipasc);
1098 if (iplen == 0)
1099 return -2;
1100 return do_x509_check(x, (char *)ipout, iplen, flags, GEN_IPADD, NULL);
1101}
1102
1103/* Convert IP addresses both IPv4 and IPv6 into an
1104 * OCTET STRING compatible with RFC3280.
1105 */
1106
1107ASN1_OCTET_STRING *
1108a2i_IPADDRESS(const char *ipasc)
1109{
1110 unsigned char ipout[16];
1111 ASN1_OCTET_STRING *ret;
1112 int iplen;
1113
1114 /* If string contains a ':' assume IPv6 */
1115
1116 iplen = a2i_ipadd(ipout, ipasc);
1117
1118 if (!iplen)
1119 return NULL;
1120
1121 ret = ASN1_OCTET_STRING_new();
1122 if (!ret)
1123 return NULL;
1124 if (!ASN1_OCTET_STRING_set(ret, ipout, iplen)) {
1125 ASN1_OCTET_STRING_free(ret);
1126 return NULL;
1127 }
1128 return ret;
1129}
1130
1131ASN1_OCTET_STRING *
1132a2i_IPADDRESS_NC(const char *ipasc)
1133{
1134 ASN1_OCTET_STRING *ret = NULL;
1135 unsigned char ipout[32];
1136 char *iptmp = NULL, *p;
1137 int iplen1, iplen2;
1138
1139 p = strchr(ipasc, '/');
1140 if (!p)
1141 return NULL;
1142 iptmp = strdup(ipasc);
1143 if (!iptmp)
1144 return NULL;
1145 p = iptmp + (p - ipasc);
1146 *p++ = 0;
1147
1148 iplen1 = a2i_ipadd(ipout, iptmp);
1149
1150 if (!iplen1)
1151 goto err;
1152
1153 iplen2 = a2i_ipadd(ipout + iplen1, p);
1154
1155 free(iptmp);
1156 iptmp = NULL;
1157
1158 if (!iplen2 || (iplen1 != iplen2))
1159 goto err;
1160
1161 ret = ASN1_OCTET_STRING_new();
1162 if (!ret)
1163 goto err;
1164 if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
1165 goto err;
1166
1167 return ret;
1168
1169 err:
1170 free(iptmp);
1171 if (ret)
1172 ASN1_OCTET_STRING_free(ret);
1173 return NULL;
1174}
1175
1176
1177int
1178a2i_ipadd(unsigned char *ipout, const char *ipasc)
1179{
1180 /* If string contains a ':' assume IPv6 */
1181
1182 if (strchr(ipasc, ':')) {
1183 if (!ipv6_from_asc(ipout, ipasc))
1184 return 0;
1185 return 16;
1186 } else {
1187 if (!ipv4_from_asc(ipout, ipasc))
1188 return 0;
1189 return 4;
1190 }
1191}
1192
1193static int
1194ipv4_from_asc(unsigned char *v4, const char *in)
1195{
1196 int a0, a1, a2, a3;
1197 if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4)
1198 return 0;
1199 if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255) ||
1200 (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
1201 return 0;
1202 v4[0] = a0;
1203 v4[1] = a1;
1204 v4[2] = a2;
1205 v4[3] = a3;
1206 return 1;
1207}
1208
1209typedef struct {
1210 /* Temporary store for IPV6 output */
1211 unsigned char tmp[16];
1212 /* Total number of bytes in tmp */
1213 int total;
1214 /* The position of a zero (corresponding to '::') */
1215 int zero_pos;
1216 /* Number of zeroes */
1217 int zero_cnt;
1218} IPV6_STAT;
1219
1220
1221static int
1222ipv6_from_asc(unsigned char *v6, const char *in)
1223{
1224 IPV6_STAT v6stat;
1225
1226 v6stat.total = 0;
1227 v6stat.zero_pos = -1;
1228 v6stat.zero_cnt = 0;
1229
1230 /* Treat the IPv6 representation as a list of values
1231 * separated by ':'. The presence of a '::' will parse
1232 * as one, two or three zero length elements.
1233 */
1234 if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
1235 return 0;
1236
1237 /* Now for some sanity checks */
1238
1239 if (v6stat.zero_pos == -1) {
1240 /* If no '::' must have exactly 16 bytes */
1241 if (v6stat.total != 16)
1242 return 0;
1243 } else {
1244 /* If '::' must have less than 16 bytes */
1245 if (v6stat.total == 16)
1246 return 0;
1247 /* More than three zeroes is an error */
1248 if (v6stat.zero_cnt > 3)
1249 return 0;
1250 /* Can only have three zeroes if nothing else present */
1251 else if (v6stat.zero_cnt == 3) {
1252 if (v6stat.total > 0)
1253 return 0;
1254 }
1255 /* Can only have two zeroes if at start or end */
1256 else if (v6stat.zero_cnt == 2) {
1257 if ((v6stat.zero_pos != 0) &&
1258 (v6stat.zero_pos != v6stat.total))
1259 return 0;
1260 } else
1261 /* Can only have one zero if *not* start or end */
1262 {
1263 if ((v6stat.zero_pos == 0) ||
1264 (v6stat.zero_pos == v6stat.total))
1265 return 0;
1266 }
1267 }
1268
1269 /* Format result */
1270
1271 if (v6stat.zero_pos >= 0) {
1272 /* Copy initial part */
1273 memcpy(v6, v6stat.tmp, v6stat.zero_pos);
1274 /* Zero middle */
1275 memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
1276 /* Copy final part */
1277 if (v6stat.total != v6stat.zero_pos)
1278 memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
1279 v6stat.tmp + v6stat.zero_pos,
1280 v6stat.total - v6stat.zero_pos);
1281 } else
1282 memcpy(v6, v6stat.tmp, 16);
1283
1284 return 1;
1285}
1286
1287static int
1288ipv6_cb(const char *elem, int len, void *usr)
1289{
1290 IPV6_STAT *s = usr;
1291
1292 /* Error if 16 bytes written */
1293 if (s->total == 16)
1294 return 0;
1295 if (len == 0) {
1296 /* Zero length element, corresponds to '::' */
1297 if (s->zero_pos == -1)
1298 s->zero_pos = s->total;
1299 /* If we've already got a :: its an error */
1300 else if (s->zero_pos != s->total)
1301 return 0;
1302 s->zero_cnt++;
1303 } else {
1304 /* If more than 4 characters could be final a.b.c.d form */
1305 if (len > 4) {
1306 /* Need at least 4 bytes left */
1307 if (s->total > 12)
1308 return 0;
1309 /* Must be end of string */
1310 if (elem[len])
1311 return 0;
1312 if (!ipv4_from_asc(s->tmp + s->total, elem))
1313 return 0;
1314 s->total += 4;
1315 } else {
1316 if (!ipv6_hex(s->tmp + s->total, elem, len))
1317 return 0;
1318 s->total += 2;
1319 }
1320 }
1321 return 1;
1322}
1323
1324/* Convert a string of up to 4 hex digits into the corresponding
1325 * IPv6 form.
1326 */
1327
1328static int
1329ipv6_hex(unsigned char *out, const char *in, int inlen)
1330{
1331 unsigned char c;
1332 unsigned int num = 0;
1333
1334 if (inlen > 4)
1335 return 0;
1336 while (inlen--) {
1337 c = *in++;
1338 num <<= 4;
1339 if ((c >= '0') && (c <= '9'))
1340 num |= c - '0';
1341 else if ((c >= 'A') && (c <= 'F'))
1342 num |= c - 'A' + 10;
1343 else if ((c >= 'a') && (c <= 'f'))
1344 num |= c - 'a' + 10;
1345 else
1346 return 0;
1347 }
1348 out[0] = num >> 8;
1349 out[1] = num & 0xff;
1350 return 1;
1351}
1352
1353int
1354X509V3_NAME_from_section(X509_NAME *nm, STACK_OF(CONF_VALUE)*dn_sk,
1355 unsigned long chtype)
1356{
1357 CONF_VALUE *v;
1358 int i, mval;
1359 char *p, *type;
1360
1361 if (!nm)
1362 return 0;
1363
1364 for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++) {
1365 v = sk_CONF_VALUE_value(dn_sk, i);
1366 type = v->name;
1367 /* Skip past any leading X. X: X, etc to allow for
1368 * multiple instances
1369 */
1370 for (p = type; *p; p++)
1371 if ((*p == ':') || (*p == ',') || (*p == '.')) {
1372 p++;
1373 if (*p)
1374 type = p;
1375 break;
1376 }
1377 if (*type == '+') {
1378 mval = -1;
1379 type++;
1380 } else
1381 mval = 0;
1382 if (!X509_NAME_add_entry_by_txt(nm, type, chtype,
1383 (unsigned char *) v->value, -1, -1, mval))
1384 return 0;
1385 }
1386 return 1;
1387}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-12-08 01:38:43 +0000