1 /* $OpenBSD: x509_utl.c,v 1.2 2020/09/13 15:06:17 beck Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 1999-2003 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
58 /* X509 v3 extension utilities */
64 #include <openssl/bn.h>
65 #include <openssl/conf.h>
66 #include <openssl/err.h>
67 #include <openssl/x509v3.h>
69 char *bn_to_string(const BIGNUM *bn);
70 static char *strip_spaces(char *name);
71 static int sk_strcmp(const char * const *a, const char * const *b);
72 static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
74 static void str_free(OPENSSL_STRING str);
75 static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email);
77 static int ipv4_from_asc(unsigned char *v4, const char *in);
78 static int ipv6_from_asc(unsigned char *v6, const char *in);
79 static int ipv6_cb(const char *elem, int len, void *usr);
80 static int ipv6_hex(unsigned char *out, const char *in, int inlen);
82 /* Add a CONF_VALUE name-value pair to stack. */
84 X509V3_add_value(const char *name, const char *value,
85 STACK_OF(CONF_VALUE) **extlist)
87 CONF_VALUE *vtmp = NULL;
88 STACK_OF(CONF_VALUE) *free_exts = NULL;
90 if ((vtmp = calloc(1, sizeof(CONF_VALUE))) == NULL)
93 if ((vtmp->name = strdup(name)) == NULL)
97 if ((vtmp->value = strdup(value)) == NULL)
101 if (*extlist == NULL) {
102 if ((free_exts = *extlist = sk_CONF_VALUE_new_null()) == NULL)
106 if (!sk_CONF_VALUE_push(*extlist, vtmp))
112 X509V3error(ERR_R_MALLOC_FAILURE);
113 X509V3_conf_free(vtmp);
114 if (free_exts != NULL) {
115 sk_CONF_VALUE_free(*extlist);
122 X509V3_add_value_uchar(const char *name, const unsigned char *value,
123 STACK_OF(CONF_VALUE) **extlist)
125 return X509V3_add_value(name, (const char *)value, extlist);
128 /* Free function for STACK_OF(CONF_VALUE) */
131 X509V3_conf_free(CONF_VALUE *conf)
142 X509V3_add_value_bool(const char *name, int asn1_bool,
143 STACK_OF(CONF_VALUE) **extlist)
146 return X509V3_add_value(name, "TRUE", extlist);
147 return X509V3_add_value(name, "FALSE", extlist);
151 X509V3_add_value_bool_nf(const char *name, int asn1_bool,
152 STACK_OF(CONF_VALUE) **extlist)
155 return X509V3_add_value(name, "TRUE", extlist);
160 bn_to_string(const BIGNUM *bn)
162 const char *sign = "";
166 /* Only display small numbers in decimal, as conversion is quadratic. */
167 if (BN_num_bits(bn) < 128)
168 return BN_bn2dec(bn);
170 if ((hex = bnstr = BN_bn2hex(bn)) == NULL)
173 if (BN_is_negative(bn)) {
178 if (asprintf(&ret, "%s0x%s", sign, hex) == -1)
187 i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, const ASN1_ENUMERATED *a)
194 if ((bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) == NULL ||
195 (strtmp = bn_to_string(bntmp)) == NULL)
196 X509V3error(ERR_R_MALLOC_FAILURE);
202 i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, const ASN1_INTEGER *a)
209 if ((bntmp = ASN1_INTEGER_to_BN(a, NULL)) == NULL ||
210 (strtmp = bn_to_string(bntmp)) == NULL)
211 X509V3error(ERR_R_MALLOC_FAILURE);
217 s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, const char *value)
225 X509V3error(X509V3_R_INVALID_NULL_VALUE);
229 if (value[0] == '-') {
235 if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) {
242 ret = BN_hex2bn(&bn, value);
244 ret = BN_dec2bn(&bn, value);
246 if (!ret || value[ret]) {
248 X509V3error(X509V3_R_BN_DEC2BN_ERROR);
252 if (isneg && BN_is_zero(bn))
255 aint = BN_to_ASN1_INTEGER(bn, NULL);
258 X509V3error(X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
262 aint->type |= V_ASN1_NEG;
267 X509V3_add_value_int(const char *name, const ASN1_INTEGER *aint,
268 STACK_OF(CONF_VALUE) **extlist)
275 if (!(strtmp = i2s_ASN1_INTEGER(NULL, aint)))
277 ret = X509V3_add_value(name, strtmp, extlist);
283 X509V3_get_value_bool(const CONF_VALUE *value, int *asn1_bool)
287 if (!(btmp = value->value))
289 if (!strcmp(btmp, "TRUE") || !strcmp(btmp, "true") ||
290 !strcmp(btmp, "Y") || !strcmp(btmp, "y") ||
291 !strcmp(btmp, "YES") || !strcmp(btmp, "yes")) {
294 } else if (!strcmp(btmp, "FALSE") || !strcmp(btmp, "false") ||
295 !strcmp(btmp, "N") || !strcmp(btmp, "n") ||
296 !strcmp(btmp, "NO") || !strcmp(btmp, "no")) {
302 X509V3error(X509V3_R_INVALID_BOOLEAN_STRING);
303 X509V3_conf_err(value);
308 X509V3_get_value_int(const CONF_VALUE *value, ASN1_INTEGER **aint)
312 if (!(itmp = s2i_ASN1_INTEGER(NULL, value->value))) {
313 X509V3_conf_err(value);
325 STACK_OF(CONF_VALUE) *
326 X509V3_parse_list(const char *line)
330 STACK_OF(CONF_VALUE) *values = NULL;
334 /* We are going to modify the line so copy it first */
335 if ((linebuf = strdup(line)) == NULL) {
336 X509V3error(ERR_R_MALLOC_FAILURE);
342 /* Go through all characters */
343 for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') &&
351 ntmp = strip_spaces(q);
353 X509V3error(X509V3_R_INVALID_NULL_NAME);
357 } else if (c == ',') {
359 ntmp = strip_spaces(q);
362 X509V3error(X509V3_R_INVALID_NULL_NAME);
365 X509V3_add_value(ntmp, NULL, &values);
373 vtmp = strip_spaces(q);
375 X509V3error(X509V3_R_INVALID_NULL_VALUE);
378 X509V3_add_value(ntmp, vtmp, &values);
386 if (state == HDR_VALUE) {
387 vtmp = strip_spaces(q);
389 X509V3error(X509V3_R_INVALID_NULL_VALUE);
392 X509V3_add_value(ntmp, vtmp, &values);
394 ntmp = strip_spaces(q);
396 X509V3error(X509V3_R_INVALID_NULL_NAME);
399 X509V3_add_value(ntmp, NULL, &values);
406 sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
411 /* Delete leading and trailing spaces from a string */
413 strip_spaces(char *name)
417 /* Skip over leading spaces */
419 while (*p && isspace((unsigned char)*p))
423 q = p + strlen(p) - 1;
424 while ((q != p) && isspace((unsigned char)*q))
433 /* hex string utilities */
435 /* Given a buffer of length 'len' return a malloc'ed string with its
439 hex_to_string(const unsigned char *buffer, long len)
442 const unsigned char *p;
444 static const char hexdig[] = "0123456789ABCDEF";
448 if (!(tmp = malloc(len * 3 + 1))) {
449 X509V3error(ERR_R_MALLOC_FAILURE);
453 for (i = 0, p = buffer; i < len; i++, p++) {
454 *q++ = hexdig[(*p >> 4) & 0xf];
455 *q++ = hexdig[*p & 0xf];
462 /* Give a string of hex digits convert to
467 string_to_hex(const char *str, long *len)
469 unsigned char *hexbuf, *q;
470 unsigned char ch, cl, *p;
472 X509V3error(X509V3_R_INVALID_NULL_ARGUMENT);
475 if (!(hexbuf = malloc(strlen(str) >> 1)))
477 for (p = (unsigned char *)str, q = hexbuf; *p; ) {
483 X509V3error(X509V3_R_ODD_NUMBER_OF_DIGITS);
490 if ((ch >= '0') && (ch <= '9'))
492 else if ((ch >= 'a') && (ch <= 'f'))
497 if ((cl >= '0') && (cl <= '9'))
499 else if ((cl >= 'a') && (cl <= 'f'))
504 *q++ = (ch << 4) | cl;
514 X509V3error(ERR_R_MALLOC_FAILURE);
519 X509V3error(X509V3_R_ILLEGAL_HEX_DIGIT);
523 /* V2I name comparison function: returns zero if 'name' matches
528 name_cmp(const char *name, const char *cmp)
534 if ((ret = strncmp(name, cmp, len)))
543 sk_strcmp(const char * const *a, const char * const *b)
545 return strcmp(*a, *b);
548 STACK_OF(OPENSSL_STRING) *
549 X509_get1_email(X509 *x)
552 STACK_OF(OPENSSL_STRING) *ret;
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);
560 STACK_OF(OPENSSL_STRING) *
561 X509_get1_ocsp(X509 *x)
563 AUTHORITY_INFO_ACCESS *info;
564 STACK_OF(OPENSSL_STRING) *ret = NULL;
567 info = X509_get_ext_d2i(x, NID_info_access, NULL, 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))
580 AUTHORITY_INFO_ACCESS_free(info);
584 STACK_OF(OPENSSL_STRING) *
585 X509_REQ_get1_email(X509_REQ *x)
588 STACK_OF(X509_EXTENSION) *exts;
589 STACK_OF(OPENSSL_STRING) *ret;
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);
600 static STACK_OF(OPENSSL_STRING) *
601 get_email(X509_NAME *name, GENERAL_NAMES *gens)
603 STACK_OF(OPENSSL_STRING) *ret = NULL;
605 ASN1_IA5STRING *email;
609 /* Now add any email address(es) to STACK */
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))
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)
624 if (!append_ia5(&ret, gen->d.ia5))
631 str_free(OPENSSL_STRING str)
637 append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email)
641 /* First some sanity checks */
642 if (email->type != V_ASN1_IA5STRING)
644 if (!email->data || !email->length)
647 *sk = sk_OPENSSL_STRING_new(sk_strcmp);
650 /* Don't add duplicates */
651 if (sk_OPENSSL_STRING_find(*sk, (char *)email->data) != -1)
653 emtmp = strdup((char *)email->data);
654 if (!emtmp || !sk_OPENSSL_STRING_push(*sk, emtmp)) {
655 X509_email_free(*sk);
663 X509_email_free(STACK_OF(OPENSSL_STRING) *sk)
665 sk_OPENSSL_STRING_pop_free(sk, str_free);
668 typedef int (*equal_fn)(const unsigned char *pattern, size_t pattern_len,
669 const unsigned char *subject, size_t subject_len, unsigned int flags);
671 /* Skip pattern prefix to match "wildcard" subject */
673 skip_prefix(const unsigned char **p, size_t *plen, const unsigned char *subject,
674 size_t subject_len, unsigned int flags)
676 const unsigned char *pattern = *p;
677 size_t pattern_len = *plen;
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
685 if ((flags & _X509_CHECK_FLAG_DOT_SUBDOMAINS) == 0)
688 while (pattern_len > subject_len && *pattern) {
689 if ((flags & X509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS) &&
696 /* Skip if entire prefix acceptable */
697 if (pattern_len == subject_len) {
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.
711 /* Compare using strncasecmp */
713 equal_nocase(const unsigned char *pattern, size_t pattern_len,
714 const unsigned char *subject, size_t subject_len, unsigned int flags)
716 if (memchr(pattern, '\0', pattern_len) != NULL)
718 if (memchr(subject, '\0', subject_len) != NULL)
720 skip_prefix(&pattern, &pattern_len, subject, subject_len, flags);
721 if (pattern_len != subject_len)
723 return (strncasecmp(pattern, subject, pattern_len) == 0);
726 /* Compare using strncmp. */
728 equal_case(const unsigned char *pattern, size_t pattern_len,
729 const unsigned char *subject, size_t subject_len, unsigned int flags)
731 if (memchr(pattern, 0, pattern_len) != NULL)
733 if (memchr(subject, 0, subject_len) != NULL)
735 skip_prefix(&pattern, &pattern_len, subject, subject_len, flags);
736 if (pattern_len != subject_len)
738 return (strncmp(pattern, subject, pattern_len) == 0);
742 * RFC 5280, section 7.5, requires that only the domain is compared in a
743 * case-insensitive manner.
746 equal_email(const unsigned char *a, size_t a_len, const unsigned char *b,
747 size_t b_len, unsigned int unused_flags)
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.
759 if (a[pos] == '@' || b[pos] == '@') {
760 if (!equal_nocase(a + pos, a_len - pos, b + pos,
768 return equal_case(a, pos, b, pos, 0);
772 * Compare the prefix and suffix with the subject, and check that the
773 * characters in-between are valid.
776 wildcard_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)
780 const unsigned char *wildcard_start;
781 const unsigned char *wildcard_end;
782 const unsigned char *p;
786 if (subject_len < prefix_len + suffix_len)
788 if (!equal_nocase(prefix, prefix_len, subject, prefix_len, flags))
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))
795 * If the wildcard makes up the entire first label, it must match at
796 * least one character.
798 if (prefix_len == 0 && *suffix == '.') {
799 if (wildcard_start == wildcard_end)
802 if (flags & X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS)
805 /* IDNA labels cannot match partial wildcards */
808 && strncasecmp((char *)subject, "xn--", 4) == 0)
810 /* The wildcard may match a literal '*' */
811 if (wildcard_end == wildcard_start + 1 && *wildcard_start == '*')
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.
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 == '.')))
826 #define LABEL_START (1 << 0)
827 #define LABEL_END (1 << 1)
828 #define LABEL_HYPHEN (1 << 2)
829 #define LABEL_IDNA (1 << 3)
831 static const unsigned char *
832 valid_star(const unsigned char *p, size_t len, unsigned int flags)
834 const unsigned char *star = 0;
836 int state = LABEL_START;
838 for (i = 0; i < len; ++i) {
840 * Locate first and only legal wildcard, either at the start
841 * or end of a non-IDNA first and not final label.
844 int atstart = (state & LABEL_START);
845 int atend = (i == len - 1 || p[i + 1] == '.');
847 * At most one wildcard per pattern.
848 * No wildcards in IDNA labels.
849 * No wildcards after the first label.
851 if (star != NULL || (state & LABEL_IDNA) != 0 || dots)
853 /* Only full-label '*.example.com' wildcards? */
854 if ((flags & X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS)
855 && (!atstart || !atend))
857 /* No 'foo*bar' wildcards */
858 if (!atstart && !atend)
861 state &= ~LABEL_START;
862 } else if ((state & LABEL_START) != 0) {
864 * At the start of a label, skip any "xn--" and
865 * remain in the LABEL_START state, but set the
868 if ((state & LABEL_IDNA) == 0 && len - i >= 4
869 && strncasecmp((char *)&p[i], "xn--", 4) == 0) {
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'))
881 } else if (('a' <= p[i] && p[i] <= 'z')
882 || ('A' <= p[i] && p[i] <= 'Z')
883 || ('0' <= p[i] && p[i] <= '9')) {
886 } else if (p[i] == '.') {
887 if (state & (LABEL_HYPHEN | LABEL_START))
891 } else if (p[i] == '-') {
892 /* no domain/subdomain starts with '-' */
893 if ((state & LABEL_START) != 0)
895 state |= LABEL_HYPHEN;
901 * The final label must not end in a hyphen or ".", and
902 * there must be at least two dots after the star.
904 if ((state & (LABEL_START | LABEL_HYPHEN)) != 0 || dots < 2)
909 /* Compare using wildcards. */
911 equal_wildcard(const unsigned char *pattern, size_t pattern_len,
912 const unsigned char *subject, size_t subject_len, unsigned int flags)
914 const unsigned char *star = NULL;
917 * Subject names starting with '.' can only match a wildcard pattern
918 * via a subject sub-domain pattern suffix match.
920 if (!(subject_len > 1 && subject[0] == '.'))
921 star = valid_star(pattern, pattern_len, flags);
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);
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
937 do_check_string(ASN1_STRING *a, int cmp_type, equal_fn equal,
938 unsigned int flags, const char *b, size_t blen, char **peername)
942 if (!a->data || !a->length)
945 if (cmp_type != a->type)
947 if (cmp_type == V_ASN1_IA5STRING)
948 rv = equal(a->data, a->length, (unsigned char *)b,
950 else if (a->length == (int)blen && !memcmp(a->data, b, blen))
952 if (rv > 0 && peername &&
953 (*peername = strndup((char *)a->data, a->length)) == NULL)
958 astrlen = ASN1_STRING_to_UTF8(&astr, a);
961 rv = equal(astr, astrlen, (unsigned char *)b, blen, flags);
962 if (rv > 0 && peername &&
963 (*peername = strndup((char *)astr, astrlen)) == NULL)
971 do_x509_check(X509 *x, const char *chk, size_t chklen, unsigned int flags,
972 int check_type, char **peername)
974 GENERAL_NAMES *gens = NULL;
975 X509_NAME *name = NULL;
978 int cnid = NID_undef;
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;
990 } else if (check_type == GEN_DNS) {
991 if (!(flags & X509_CHECK_FLAG_NEVER_CHECK_SUBJECT))
992 cnid = NID_commonName;
993 /* Implicit client-side DNS sub-domain pattern */
994 if (chklen > 1 && chk[0] == '.')
995 flags |= _X509_CHECK_FLAG_DOT_SUBDOMAINS;
996 alt_type = V_ASN1_IA5STRING;
997 if (flags & X509_CHECK_FLAG_NO_WILDCARDS)
998 equal = equal_nocase;
1000 equal = equal_wildcard;
1002 alt_type = V_ASN1_OCTET_STRING;
1006 gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
1008 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
1011 gen = sk_GENERAL_NAME_value(gens, i);
1012 if (gen->type != check_type)
1015 if (check_type == GEN_EMAIL)
1016 cstr = gen->d.rfc822Name;
1017 else if (check_type == GEN_DNS)
1018 cstr = gen->d.dNSName;
1020 cstr = gen->d.iPAddress;
1021 /* Positive on success, negative on error! */
1022 if ((rv = do_check_string(cstr, alt_type, equal, flags,
1023 chk, chklen, peername)) != 0)
1026 GENERAL_NAMES_free(gens);
1029 if (cnid == NID_undef ||
1031 !(flags & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT)))
1035 /* We're done if CN-ID is not pertinent */
1036 if (cnid == NID_undef)
1040 name = X509_get_subject_name(x);
1041 while ((j = X509_NAME_get_index_by_NID(name, cnid, j)) >= 0) {
1042 X509_NAME_ENTRY *ne;
1044 if ((ne = X509_NAME_get_entry(name, j)) == NULL)
1046 if ((str = X509_NAME_ENTRY_get_data(ne)) == NULL)
1048 /* Positive on success, negative on error! */
1049 if ((rv = do_check_string(str, -1, equal, flags,
1050 chk, chklen, peername)) != 0)
1057 X509_check_host(X509 *x, const char *chk, size_t chklen, unsigned int flags,
1063 chklen = strlen(chk);
1064 else if (memchr(chk, '\0', chklen))
1066 return do_x509_check(x, chk, chklen, flags, GEN_DNS, peername);
1070 X509_check_email(X509 *x, const char *chk, size_t chklen, unsigned int flags)
1075 chklen = strlen(chk);
1076 else if (memchr(chk, '\0', chklen))
1078 return do_x509_check(x, chk, chklen, flags, GEN_EMAIL, NULL);
1082 X509_check_ip(X509 *x, const unsigned char *chk, size_t chklen,
1087 return do_x509_check(x, (char *)chk, chklen, flags, GEN_IPADD, NULL);
1091 X509_check_ip_asc(X509 *x, const char *ipasc, unsigned int flags)
1093 unsigned char ipout[16];
1098 iplen = (size_t)a2i_ipadd(ipout, ipasc);
1101 return do_x509_check(x, (char *)ipout, iplen, flags, GEN_IPADD, NULL);
1104 /* Convert IP addresses both IPv4 and IPv6 into an
1105 * OCTET STRING compatible with RFC3280.
1109 a2i_IPADDRESS(const char *ipasc)
1111 unsigned char ipout[16];
1112 ASN1_OCTET_STRING *ret;
1115 /* If string contains a ':' assume IPv6 */
1117 iplen = a2i_ipadd(ipout, ipasc);
1122 ret = ASN1_OCTET_STRING_new();
1125 if (!ASN1_OCTET_STRING_set(ret, ipout, iplen)) {
1126 ASN1_OCTET_STRING_free(ret);
1133 a2i_IPADDRESS_NC(const char *ipasc)
1135 ASN1_OCTET_STRING *ret = NULL;
1136 unsigned char ipout[32];
1137 char *iptmp = NULL, *p;
1140 p = strchr(ipasc, '/');
1143 iptmp = strdup(ipasc);
1146 p = iptmp + (p - ipasc);
1149 iplen1 = a2i_ipadd(ipout, iptmp);
1154 iplen2 = a2i_ipadd(ipout + iplen1, p);
1159 if (!iplen2 || (iplen1 != iplen2))
1162 ret = ASN1_OCTET_STRING_new();
1165 if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
1173 ASN1_OCTET_STRING_free(ret);
1179 a2i_ipadd(unsigned char *ipout, const char *ipasc)
1181 /* If string contains a ':' assume IPv6 */
1183 if (strchr(ipasc, ':')) {
1184 if (!ipv6_from_asc(ipout, ipasc))
1188 if (!ipv4_from_asc(ipout, ipasc))
1195 ipv4_from_asc(unsigned char *v4, const char *in)
1198 if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4)
1200 if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255) ||
1201 (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
1211 /* Temporary store for IPV6 output */
1212 unsigned char tmp[16];
1213 /* Total number of bytes in tmp */
1215 /* The position of a zero (corresponding to '::') */
1217 /* Number of zeroes */
1223 ipv6_from_asc(unsigned char *v6, const char *in)
1228 v6stat.zero_pos = -1;
1229 v6stat.zero_cnt = 0;
1231 /* Treat the IPv6 representation as a list of values
1232 * separated by ':'. The presence of a '::' will parse
1233 * as one, two or three zero length elements.
1235 if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
1238 /* Now for some sanity checks */
1240 if (v6stat.zero_pos == -1) {
1241 /* If no '::' must have exactly 16 bytes */
1242 if (v6stat.total != 16)
1245 /* If '::' must have less than 16 bytes */
1246 if (v6stat.total == 16)
1248 /* More than three zeroes is an error */
1249 if (v6stat.zero_cnt > 3)
1251 /* Can only have three zeroes if nothing else present */
1252 else if (v6stat.zero_cnt == 3) {
1253 if (v6stat.total > 0)
1256 /* Can only have two zeroes if at start or end */
1257 else if (v6stat.zero_cnt == 2) {
1258 if ((v6stat.zero_pos != 0) &&
1259 (v6stat.zero_pos != v6stat.total))
1262 /* Can only have one zero if *not* start or end */
1264 if ((v6stat.zero_pos == 0) ||
1265 (v6stat.zero_pos == v6stat.total))
1272 if (v6stat.zero_pos >= 0) {
1273 /* Copy initial part */
1274 memcpy(v6, v6stat.tmp, v6stat.zero_pos);
1276 memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
1277 /* Copy final part */
1278 if (v6stat.total != v6stat.zero_pos)
1279 memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
1280 v6stat.tmp + v6stat.zero_pos,
1281 v6stat.total - v6stat.zero_pos);
1283 memcpy(v6, v6stat.tmp, 16);
1289 ipv6_cb(const char *elem, int len, void *usr)
1293 /* Error if 16 bytes written */
1297 /* Zero length element, corresponds to '::' */
1298 if (s->zero_pos == -1)
1299 s->zero_pos = s->total;
1300 /* If we've already got a :: its an error */
1301 else if (s->zero_pos != s->total)
1305 /* If more than 4 characters could be final a.b.c.d form */
1307 /* Need at least 4 bytes left */
1310 /* Must be end of string */
1313 if (!ipv4_from_asc(s->tmp + s->total, elem))
1317 if (!ipv6_hex(s->tmp + s->total, elem, len))
1325 /* Convert a string of up to 4 hex digits into the corresponding
1330 ipv6_hex(unsigned char *out, const char *in, int inlen)
1333 unsigned int num = 0;
1340 if ((c >= '0') && (c <= '9'))
1342 else if ((c >= 'A') && (c <= 'F'))
1343 num |= c - 'A' + 10;
1344 else if ((c >= 'a') && (c <= 'f'))
1345 num |= c - 'a' + 10;
1350 out[1] = num & 0xff;
1355 X509V3_NAME_from_section(X509_NAME *nm, STACK_OF(CONF_VALUE)*dn_sk,
1356 unsigned long chtype)
1365 for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++) {
1366 v = sk_CONF_VALUE_value(dn_sk, i);
1368 /* Skip past any leading X. X: X, etc to allow for
1369 * multiple instances
1371 for (p = type; *p; p++)
1372 if ((*p == ':') || (*p == ',') || (*p == '.')) {
1383 if (!X509_NAME_add_entry_by_txt(nm, type, chtype,
1384 (unsigned char *) v->value, -1, -1, mval))