3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
6 /* ====================================================================
7 * Copyright (c) 1999-2003 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
59 /* X509 v3 extension utilities */
65 #include <openssl/bn.h>
66 #include <openssl/buf.h>
67 #include <openssl/conf.h>
68 #include <openssl/err.h>
69 #include <openssl/mem.h>
70 #include <openssl/obj.h>
71 #include <openssl/x509v3.h>
73 #include "../conf/internal.h"
74 #include "../internal.h"
77 static char *strip_spaces(char *name);
78 static int sk_strcmp(const OPENSSL_STRING *a, const OPENSSL_STRING *b);
79 static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
81 static void str_free(OPENSSL_STRING str);
82 static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email);
84 static int ipv4_from_asc(unsigned char *v4, const char *in);
85 static int ipv6_from_asc(unsigned char *v6, const char *in);
86 static int ipv6_cb(const char *elem, int len, void *usr);
87 static int ipv6_hex(unsigned char *out, const char *in, int inlen);
89 /* Add a CONF_VALUE name value pair to stack */
91 int X509V3_add_value(const char *name, const char *value,
92 STACK_OF(CONF_VALUE) **extlist)
94 CONF_VALUE *vtmp = NULL;
95 char *tname = NULL, *tvalue = NULL;
96 if (name && !(tname = BUF_strdup(name)))
98 if (value && !(tvalue = BUF_strdup(value)))
100 if (!(vtmp = CONF_VALUE_new()))
102 if (!*extlist && !(*extlist = sk_CONF_VALUE_new_null()))
104 vtmp->section = NULL;
106 vtmp->value = tvalue;
107 if (!sk_CONF_VALUE_push(*extlist, vtmp))
111 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
117 OPENSSL_free(tvalue);
121 int X509V3_add_value_uchar(const char *name, const unsigned char *value,
122 STACK_OF(CONF_VALUE) **extlist)
124 return X509V3_add_value(name, (const char *)value, extlist);
127 /* Free function for STACK_OF(CONF_VALUE) */
129 void X509V3_conf_free(CONF_VALUE *conf)
134 OPENSSL_free(conf->name);
136 OPENSSL_free(conf->value);
138 OPENSSL_free(conf->section);
142 int 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);
150 int X509V3_add_value_bool_nf(char *name, int asn1_bool,
151 STACK_OF(CONF_VALUE) **extlist)
154 return X509V3_add_value(name, "TRUE", extlist);
158 static char *bignum_to_string(const BIGNUM *bn)
164 * Display large numbers in hex and small numbers in decimal. Converting to
165 * decimal takes quadratic time and is no more useful than hex for large
168 if (BN_num_bits(bn) < 32) {
169 return BN_bn2dec(bn);
177 len = strlen(tmp) + 3;
178 ret = OPENSSL_malloc(len);
180 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
185 /* Prepend "0x", but place it after the "-" if negative. */
187 BUF_strlcpy(ret, "-0x", len);
188 BUF_strlcat(ret, tmp + 1, len);
190 BUF_strlcpy(ret, "0x", len);
191 BUF_strlcat(ret, tmp, len);
197 char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, ASN1_ENUMERATED *a)
199 BIGNUM *bntmp = NULL;
203 if (!(bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) ||
204 !(strtmp = bignum_to_string(bntmp)))
205 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
210 char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, ASN1_INTEGER *a)
212 BIGNUM *bntmp = NULL;
216 if (!(bntmp = ASN1_INTEGER_to_BN(a, NULL)) ||
217 !(strtmp = bignum_to_string(bntmp)))
218 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
223 ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, char *value)
230 OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NULL_VALUE);
234 if (value[0] == '-') {
240 if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) {
247 ret = BN_hex2bn(&bn, value);
249 ret = BN_dec2bn(&bn, value);
251 if (!ret || value[ret]) {
253 OPENSSL_PUT_ERROR(X509V3, X509V3_R_BN_DEC2BN_ERROR);
257 if (isneg && BN_is_zero(bn))
260 aint = BN_to_ASN1_INTEGER(bn, NULL);
263 OPENSSL_PUT_ERROR(X509V3, X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
267 aint->type |= V_ASN1_NEG;
271 int X509V3_add_value_int(const char *name, ASN1_INTEGER *aint,
272 STACK_OF(CONF_VALUE) **extlist)
278 if (!(strtmp = i2s_ASN1_INTEGER(NULL, aint)))
280 ret = X509V3_add_value(name, strtmp, extlist);
281 OPENSSL_free(strtmp);
285 int X509V3_get_value_bool(CONF_VALUE *value, int *asn1_bool)
288 if (!(btmp = value->value))
290 if (!strcmp(btmp, "TRUE") || !strcmp(btmp, "true")
291 || !strcmp(btmp, "Y") || !strcmp(btmp, "y")
292 || !strcmp(btmp, "YES") || !strcmp(btmp, "yes")) {
295 } else if (!strcmp(btmp, "FALSE") || !strcmp(btmp, "false")
296 || !strcmp(btmp, "N") || !strcmp(btmp, "n")
297 || !strcmp(btmp, "NO") || !strcmp(btmp, "no")) {
302 OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_BOOLEAN_STRING);
303 X509V3_conf_err(value);
307 int X509V3_get_value_int(CONF_VALUE *value, ASN1_INTEGER **aint)
310 if (!(itmp = s2i_ASN1_INTEGER(NULL, value->value))) {
311 X509V3_conf_err(value);
325 STACK_OF(CONF_VALUE) *X509V3_parse_list(const char *line)
329 STACK_OF(CONF_VALUE) *values = NULL;
332 /* We are going to modify the line so copy it first */
333 linebuf = BUF_strdup(line);
334 if (linebuf == NULL) {
335 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
340 /* Go through all characters */
341 for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
349 ntmp = strip_spaces(q);
351 OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NULL_NAME);
355 } else if (c == ',') {
357 ntmp = strip_spaces(q);
360 printf("%s\n", ntmp);
363 OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NULL_NAME);
366 X509V3_add_value(ntmp, NULL, &values);
374 vtmp = strip_spaces(q);
376 printf("%s\n", ntmp);
379 OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NULL_VALUE);
382 X509V3_add_value(ntmp, vtmp, &values);
390 if (state == HDR_VALUE) {
391 vtmp = strip_spaces(q);
393 printf("%s=%s\n", ntmp, vtmp);
396 OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NULL_VALUE);
399 X509V3_add_value(ntmp, vtmp, &values);
401 ntmp = strip_spaces(q);
403 printf("%s\n", ntmp);
406 OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NULL_NAME);
409 X509V3_add_value(ntmp, NULL, &values);
411 OPENSSL_free(linebuf);
415 OPENSSL_free(linebuf);
416 sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
421 /* Delete leading and trailing spaces from a string */
422 static char *strip_spaces(char *name)
425 /* Skip over leading spaces */
427 while (*p && isspace((unsigned char)*p))
431 q = p + strlen(p) - 1;
432 while ((q != p) && isspace((unsigned char)*q))
441 /* hex string utilities */
444 * Given a buffer of length 'len' return a OPENSSL_malloc'ed string with its
445 * hex representation @@@ (Contents of buffer are always kept in ASCII, also
446 * on EBCDIC machines)
449 char *hex_to_string(const unsigned char *buffer, long len)
452 const unsigned char *p;
454 static const char hexdig[] = "0123456789ABCDEF";
457 if (!(tmp = OPENSSL_malloc(len * 3 + 1))) {
458 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
462 for (i = 0, p = buffer; i < len; i++, p++) {
463 *q++ = hexdig[(*p >> 4) & 0xf];
464 *q++ = hexdig[*p & 0xf];
473 * Give a string of hex digits convert to a buffer
476 unsigned char *string_to_hex(const char *str, long *len)
478 unsigned char *hexbuf, *q;
479 unsigned char ch, cl, *p;
481 OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NULL_ARGUMENT);
484 if (!(hexbuf = OPENSSL_malloc(strlen(str) >> 1)))
486 for (p = (unsigned char *)str, q = hexbuf; *p;) {
492 OPENSSL_PUT_ERROR(X509V3, X509V3_R_ODD_NUMBER_OF_DIGITS);
493 OPENSSL_free(hexbuf);
497 if ((ch >= '0') && (ch <= '9'))
499 else if ((ch >= 'a') && (ch <= 'f'))
501 else if ((ch >= 'A') && (ch <= 'F'))
506 if ((cl >= '0') && (cl <= '9'))
508 else if ((cl >= 'a') && (cl <= 'f'))
510 else if ((cl >= 'A') && (cl <= 'F'))
515 *q++ = (ch << 4) | cl;
525 OPENSSL_free(hexbuf);
526 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
530 OPENSSL_free(hexbuf);
531 OPENSSL_PUT_ERROR(X509V3, X509V3_R_ILLEGAL_HEX_DIGIT);
537 * V2I name comparison function: returns zero if 'name' matches cmp or cmp.*
540 int name_cmp(const char *name, const char *cmp)
545 if ((ret = strncmp(name, cmp, len)))
548 if (!c || (c == '.'))
553 static int sk_strcmp(const OPENSSL_STRING *a, const OPENSSL_STRING *b)
555 return strcmp(*a, *b);
558 STACK_OF(OPENSSL_STRING) *X509_get1_email(X509 *x)
561 STACK_OF(OPENSSL_STRING) *ret;
563 gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
564 ret = get_email(X509_get_subject_name(x), gens);
565 sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
569 STACK_OF(OPENSSL_STRING) *X509_get1_ocsp(X509 *x)
571 AUTHORITY_INFO_ACCESS *info;
572 STACK_OF(OPENSSL_STRING) *ret = NULL;
575 info = X509_get_ext_d2i(x, NID_info_access, NULL, NULL);
578 for (i = 0; i < sk_ACCESS_DESCRIPTION_num(info); i++) {
579 ACCESS_DESCRIPTION *ad = sk_ACCESS_DESCRIPTION_value(info, i);
580 if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
581 if (ad->location->type == GEN_URI) {
583 (&ret, ad->location->d.uniformResourceIdentifier))
588 AUTHORITY_INFO_ACCESS_free(info);
592 STACK_OF(OPENSSL_STRING) *X509_REQ_get1_email(X509_REQ *x)
595 STACK_OF(X509_EXTENSION) *exts;
596 STACK_OF(OPENSSL_STRING) *ret;
598 exts = X509_REQ_get_extensions(x);
599 gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);
600 ret = get_email(X509_REQ_get_subject_name(x), gens);
601 sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
602 sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
606 static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
609 STACK_OF(OPENSSL_STRING) *ret = NULL;
611 ASN1_IA5STRING *email;
615 /* Now add any email address(es) to STACK */
617 /* First supplied X509_NAME */
618 while ((i = X509_NAME_get_index_by_NID(name,
619 NID_pkcs9_emailAddress, i)) >= 0) {
620 ne = X509_NAME_get_entry(name, i);
621 email = X509_NAME_ENTRY_get_data(ne);
622 if (!append_ia5(&ret, email))
625 for (j = 0; j < sk_GENERAL_NAME_num(gens); j++) {
626 gen = sk_GENERAL_NAME_value(gens, j);
627 if (gen->type != GEN_EMAIL)
629 if (!append_ia5(&ret, gen->d.ia5))
635 static void str_free(OPENSSL_STRING str)
640 static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email)
643 /* First some sanity checks */
644 if (email->type != V_ASN1_IA5STRING)
646 if (!email->data || !email->length)
649 *sk = sk_OPENSSL_STRING_new(sk_strcmp);
652 /* Don't add duplicates */
653 if (sk_OPENSSL_STRING_find(*sk, NULL, (char *)email->data))
655 emtmp = BUF_strdup((char *)email->data);
656 if (!emtmp || !sk_OPENSSL_STRING_push(*sk, emtmp)) {
657 X509_email_free(*sk);
664 void X509_email_free(STACK_OF(OPENSSL_STRING) *sk)
666 sk_OPENSSL_STRING_pop_free(sk, str_free);
669 typedef int (*equal_fn) (const unsigned char *pattern, size_t pattern_len,
670 const unsigned char *subject, size_t subject_len,
673 /* Skip pattern prefix to match "wildcard" subject */
674 static void skip_prefix(const unsigned char **p, size_t *plen,
675 const unsigned char *subject, size_t subject_len,
678 const unsigned char *pattern = *p;
679 size_t pattern_len = *plen;
682 * If subject starts with a leading '.' followed by more octets, and
683 * pattern is longer, compare just an equal-length suffix with the
684 * full subject (starting at the '.'), provided the prefix contains
687 if ((flags & _X509_CHECK_FLAG_DOT_SUBDOMAINS) == 0)
690 while (pattern_len > subject_len && *pattern) {
691 if ((flags & X509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS) &&
698 /* Skip if entire prefix acceptable */
699 if (pattern_len == subject_len) {
705 /* Compare while ASCII ignoring case. */
706 static int equal_nocase(const unsigned char *pattern, size_t pattern_len,
707 const unsigned char *subject, size_t subject_len,
710 skip_prefix(&pattern, &pattern_len, subject, subject_len, flags);
711 if (pattern_len != subject_len)
713 while (pattern_len) {
714 unsigned char l = *pattern;
715 unsigned char r = *subject;
716 /* The pattern must not contain NUL characters. */
720 if ('A' <= l && l <= 'Z')
722 if ('A' <= r && r <= 'Z')
734 /* Compare using OPENSSL_memcmp. */
735 static int equal_case(const unsigned char *pattern, size_t pattern_len,
736 const unsigned char *subject, size_t subject_len,
739 skip_prefix(&pattern, &pattern_len, subject, subject_len, flags);
740 if (pattern_len != subject_len)
742 return !OPENSSL_memcmp(pattern, subject, pattern_len);
746 * RFC 5280, section 7.5, requires that only the domain is compared in a
747 * case-insensitive manner.
749 static int equal_email(const unsigned char *a, size_t a_len,
750 const unsigned char *b, size_t b_len,
751 unsigned int unused_flags)
757 * We search backwards for the '@' character, so that we do not have to
758 * deal with quoted local-parts. The domain part is compared in a
759 * case-insensitive manner.
763 if (a[i] == '@' || b[i] == '@') {
764 if (!equal_nocase(a + i, a_len - i, b + i, a_len - i, 0))
771 return equal_case(a, i, b, i, 0);
775 * Compare the prefix and suffix with the subject, and check that the
776 * characters in-between are valid.
778 static int wildcard_match(const unsigned char *prefix, size_t prefix_len,
779 const unsigned char *suffix, size_t suffix_len,
780 const unsigned char *subject, size_t subject_len,
783 const unsigned char *wildcard_start;
784 const unsigned char *wildcard_end;
785 const unsigned char *p;
789 if (subject_len < prefix_len + suffix_len)
791 if (!equal_nocase(prefix, prefix_len, subject, prefix_len, flags))
793 wildcard_start = subject + prefix_len;
794 wildcard_end = subject + (subject_len - suffix_len);
795 if (!equal_nocase(wildcard_end, suffix_len, suffix, suffix_len, flags))
798 * If the wildcard makes up the entire first label, it must match at
799 * least one character.
801 if (prefix_len == 0 && *suffix == '.') {
802 if (wildcard_start == wildcard_end)
805 if (flags & X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS)
808 /* IDNA labels cannot match partial wildcards */
811 && OPENSSL_strncasecmp((char *)subject, "xn--", 4) == 0)
813 /* The wildcard may match a literal '*' */
814 if (wildcard_end == wildcard_start + 1 && *wildcard_start == '*')
817 * Check that the part matched by the wildcard contains only
818 * permitted characters and only matches a single label unless
819 * allow_multi is set.
821 for (p = wildcard_start; p != wildcard_end; ++p)
822 if (!(('0' <= *p && *p <= '9') ||
823 ('A' <= *p && *p <= 'Z') ||
824 ('a' <= *p && *p <= 'z') ||
825 *p == '-' || (allow_multi && *p == '.')))
830 #define LABEL_START (1 << 0)
831 #define LABEL_END (1 << 1)
832 #define LABEL_HYPHEN (1 << 2)
833 #define LABEL_IDNA (1 << 3)
835 static const unsigned char *valid_star(const unsigned char *p, size_t len,
838 const unsigned char *star = 0;
840 int state = LABEL_START;
842 for (i = 0; i < len; ++i) {
844 * Locate first and only legal wildcard, either at the start
845 * or end of a non-IDNA first and not final label.
848 int atstart = (state & LABEL_START);
849 int atend = (i == len - 1 || p[i + 1] == '.');
851 * At most one wildcard per pattern.
852 * No wildcards in IDNA labels.
853 * No wildcards after the first label.
855 if (star != NULL || (state & LABEL_IDNA) != 0 || dots)
857 /* Only full-label '*.example.com' wildcards? */
858 if ((flags & X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS)
859 && (!atstart || !atend))
861 /* No 'foo*bar' wildcards */
862 if (!atstart && !atend)
865 state &= ~LABEL_START;
866 } else if (('a' <= p[i] && p[i] <= 'z')
867 || ('A' <= p[i] && p[i] <= 'Z')
868 || ('0' <= p[i] && p[i] <= '9')) {
869 if ((state & LABEL_START) != 0
871 && OPENSSL_strncasecmp((char *)&p[i], "xn--", 4) == 0)
873 state &= ~(LABEL_HYPHEN | LABEL_START);
874 } else if (p[i] == '.') {
875 if ((state & (LABEL_HYPHEN | LABEL_START)) != 0)
879 } else if (p[i] == '-') {
880 /* no domain/subdomain starts with '-' */
881 if ((state & LABEL_START) != 0)
883 state |= LABEL_HYPHEN;
889 * The final label must not end in a hyphen or ".", and
890 * there must be at least two dots after the star.
892 if ((state & (LABEL_START | LABEL_HYPHEN)) != 0 || dots < 2)
897 /* Compare using wildcards. */
898 static int equal_wildcard(const unsigned char *pattern, size_t pattern_len,
899 const unsigned char *subject, size_t subject_len,
902 const unsigned char *star = NULL;
905 * Subject names starting with '.' can only match a wildcard pattern
906 * via a subject sub-domain pattern suffix match.
908 if (!(subject_len > 1 && subject[0] == '.'))
909 star = valid_star(pattern, pattern_len, flags);
911 return equal_nocase(pattern, pattern_len,
912 subject, subject_len, flags);
913 return wildcard_match(pattern, star - pattern,
914 star + 1, (pattern + pattern_len) - star - 1,
915 subject, subject_len, flags);
919 * Compare an ASN1_STRING to a supplied string. If they match return 1. If
920 * cmp_type > 0 only compare if string matches the type, otherwise convert it
924 static int do_check_string(ASN1_STRING *a, int cmp_type, equal_fn equal,
925 unsigned int flags, const char *b, size_t blen,
930 if (!a->data || !a->length)
933 if (cmp_type != a->type)
935 if (cmp_type == V_ASN1_IA5STRING)
936 rv = equal(a->data, a->length, (unsigned char *)b, blen, flags);
937 else if (a->length == (int)blen && !OPENSSL_memcmp(a->data, b, blen))
939 if (rv > 0 && peername)
940 *peername = BUF_strndup((char *)a->data, a->length);
944 astrlen = ASN1_STRING_to_UTF8(&astr, a);
947 rv = equal(astr, astrlen, (unsigned char *)b, blen, flags);
948 if (rv > 0 && peername)
949 *peername = BUF_strndup((char *)astr, astrlen);
955 static int do_x509_check(X509 *x, const char *chk, size_t chklen,
956 unsigned int flags, int check_type, char **peername)
958 GENERAL_NAMES *gens = NULL;
959 X509_NAME *name = NULL;
962 int cnid = NID_undef;
968 /* See below, this flag is internal-only */
969 flags &= ~_X509_CHECK_FLAG_DOT_SUBDOMAINS;
970 if (check_type == GEN_EMAIL) {
971 cnid = NID_pkcs9_emailAddress;
972 alt_type = V_ASN1_IA5STRING;
974 } else if (check_type == GEN_DNS) {
975 cnid = NID_commonName;
976 /* Implicit client-side DNS sub-domain pattern */
977 if (chklen > 1 && chk[0] == '.')
978 flags |= _X509_CHECK_FLAG_DOT_SUBDOMAINS;
979 alt_type = V_ASN1_IA5STRING;
980 if (flags & X509_CHECK_FLAG_NO_WILDCARDS)
981 equal = equal_nocase;
983 equal = equal_wildcard;
985 alt_type = V_ASN1_OCTET_STRING;
989 gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
991 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
994 gen = sk_GENERAL_NAME_value(gens, i);
995 if (gen->type != check_type)
998 if (check_type == GEN_EMAIL)
999 cstr = gen->d.rfc822Name;
1000 else if (check_type == GEN_DNS)
1001 cstr = gen->d.dNSName;
1003 cstr = gen->d.iPAddress;
1004 /* Positive on success, negative on error! */
1005 if ((rv = do_check_string(cstr, alt_type, equal, flags,
1006 chk, chklen, peername)) != 0)
1009 GENERAL_NAMES_free(gens);
1012 if (cnid == NID_undef
1014 && !(flags & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT)))
1018 /* We're done if CN-ID is not pertinent */
1019 if (cnid == NID_undef)
1023 name = X509_get_subject_name(x);
1024 while ((j = X509_NAME_get_index_by_NID(name, cnid, j)) >= 0) {
1025 X509_NAME_ENTRY *ne;
1027 ne = X509_NAME_get_entry(name, j);
1028 str = X509_NAME_ENTRY_get_data(ne);
1029 /* Positive on success, negative on error! */
1030 if ((rv = do_check_string(str, -1, equal, flags,
1031 chk, chklen, peername)) != 0)
1037 int X509_check_host(X509 *x, const char *chk, size_t chklen,
1038 unsigned int flags, char **peername)
1042 if (OPENSSL_memchr(chk, '\0', chklen))
1044 return do_x509_check(x, chk, chklen, flags, GEN_DNS, peername);
1047 int X509_check_email(X509 *x, const char *chk, size_t chklen,
1052 if (OPENSSL_memchr(chk, '\0', chklen))
1054 return do_x509_check(x, chk, chklen, flags, GEN_EMAIL, NULL);
1057 int X509_check_ip(X509 *x, const unsigned char *chk, size_t chklen,
1062 return do_x509_check(x, (char *)chk, chklen, flags, GEN_IPADD, NULL);
1065 int X509_check_ip_asc(X509 *x, const char *ipasc, unsigned int flags)
1067 unsigned char ipout[16];
1072 iplen = (size_t)a2i_ipadd(ipout, ipasc);
1075 return do_x509_check(x, (char *)ipout, iplen, flags, GEN_IPADD, NULL);
1079 * Convert IP addresses both IPv4 and IPv6 into an OCTET STRING compatible
1083 ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc)
1085 unsigned char ipout[16];
1086 ASN1_OCTET_STRING *ret;
1089 /* If string contains a ':' assume IPv6 */
1091 iplen = a2i_ipadd(ipout, ipasc);
1096 ret = ASN1_OCTET_STRING_new();
1099 if (!ASN1_OCTET_STRING_set(ret, ipout, iplen)) {
1100 ASN1_OCTET_STRING_free(ret);
1106 ASN1_OCTET_STRING *a2i_IPADDRESS_NC(const char *ipasc)
1108 ASN1_OCTET_STRING *ret = NULL;
1109 unsigned char ipout[32];
1110 char *iptmp = NULL, *p;
1112 p = strchr(ipasc, '/');
1115 iptmp = BUF_strdup(ipasc);
1118 p = iptmp + (p - ipasc);
1121 iplen1 = a2i_ipadd(ipout, iptmp);
1126 iplen2 = a2i_ipadd(ipout + iplen1, p);
1128 OPENSSL_free(iptmp);
1131 if (!iplen2 || (iplen1 != iplen2))
1134 ret = ASN1_OCTET_STRING_new();
1137 if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
1144 OPENSSL_free(iptmp);
1146 ASN1_OCTET_STRING_free(ret);
1150 int a2i_ipadd(unsigned char *ipout, const char *ipasc)
1152 /* If string contains a ':' assume IPv6 */
1154 if (strchr(ipasc, ':')) {
1155 if (!ipv6_from_asc(ipout, ipasc))
1159 if (!ipv4_from_asc(ipout, ipasc))
1165 static int ipv4_from_asc(unsigned char *v4, const char *in)
1168 if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4)
1170 if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255)
1171 || (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
1181 /* Temporary store for IPV6 output */
1182 unsigned char tmp[16];
1183 /* Total number of bytes in tmp */
1185 /* The position of a zero (corresponding to '::') */
1187 /* Number of zeroes */
1191 static int ipv6_from_asc(unsigned char *v6, const char *in)
1195 v6stat.zero_pos = -1;
1196 v6stat.zero_cnt = 0;
1198 * Treat the IPv6 representation as a list of values separated by ':'.
1199 * The presence of a '::' will parse as one, two or three zero length
1202 if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
1205 /* Now for some sanity checks */
1207 if (v6stat.zero_pos == -1) {
1208 /* If no '::' must have exactly 16 bytes */
1209 if (v6stat.total != 16)
1212 /* If '::' must have less than 16 bytes */
1213 if (v6stat.total == 16)
1215 /* More than three zeroes is an error */
1216 if (v6stat.zero_cnt > 3)
1218 /* Can only have three zeroes if nothing else present */
1219 else if (v6stat.zero_cnt == 3) {
1220 if (v6stat.total > 0)
1223 /* Can only have two zeroes if at start or end */
1224 else if (v6stat.zero_cnt == 2) {
1225 if ((v6stat.zero_pos != 0)
1226 && (v6stat.zero_pos != v6stat.total))
1229 /* Can only have one zero if *not* start or end */
1231 if ((v6stat.zero_pos == 0)
1232 || (v6stat.zero_pos == v6stat.total))
1239 if (v6stat.zero_pos >= 0) {
1240 /* Copy initial part */
1241 OPENSSL_memcpy(v6, v6stat.tmp, v6stat.zero_pos);
1243 OPENSSL_memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
1244 /* Copy final part */
1245 if (v6stat.total != v6stat.zero_pos)
1246 OPENSSL_memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
1247 v6stat.tmp + v6stat.zero_pos,
1248 v6stat.total - v6stat.zero_pos);
1250 OPENSSL_memcpy(v6, v6stat.tmp, 16);
1255 static int ipv6_cb(const char *elem, int len, void *usr)
1258 /* Error if 16 bytes written */
1262 /* Zero length element, corresponds to '::' */
1263 if (s->zero_pos == -1)
1264 s->zero_pos = s->total;
1265 /* If we've already got a :: its an error */
1266 else if (s->zero_pos != s->total)
1270 /* If more than 4 characters could be final a.b.c.d form */
1272 /* Need at least 4 bytes left */
1275 /* Must be end of string */
1278 if (!ipv4_from_asc(s->tmp + s->total, elem))
1282 if (!ipv6_hex(s->tmp + s->total, elem, len))
1291 * Convert a string of up to 4 hex digits into the corresponding IPv6 form.
1294 static int ipv6_hex(unsigned char *out, const char *in, int inlen)
1297 unsigned int num = 0;
1303 if ((c >= '0') && (c <= '9'))
1305 else if ((c >= 'A') && (c <= 'F'))
1306 num |= c - 'A' + 10;
1307 else if ((c >= 'a') && (c <= 'f'))
1308 num |= c - 'a' + 10;
1313 out[1] = num & 0xff;
1317 int X509V3_NAME_from_section(X509_NAME *nm, STACK_OF (CONF_VALUE) * dn_sk,
1318 unsigned long chtype)
1327 for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++) {
1328 v = sk_CONF_VALUE_value(dn_sk, i);
1331 * Skip past any leading X. X: X, etc to allow for multiple instances
1333 for (p = type; *p; p++)
1334 if ((*p == ':') || (*p == ',') || (*p == '.')) {
1345 if (!X509_NAME_add_entry_by_txt(nm, type, chtype,
1346 (unsigned char *)v->value, -1, -1,