2 * Copyright 1999-2021 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 /* X509 v3 extension utilities */
13 #include "internal/cryptlib.h"
16 #include "crypto/ctype.h"
17 #include <openssl/conf.h>
18 #include <openssl/crypto.h>
19 #include <openssl/x509v3.h>
20 #include "crypto/x509.h"
21 #include <openssl/bn.h>
23 #include "x509_local.h"
25 static char *strip_spaces(char *name);
26 static int sk_strcmp(const char *const *a, const char *const *b);
27 static STACK_OF(OPENSSL_STRING) *get_email(const X509_NAME *name,
29 static void str_free(OPENSSL_STRING str);
30 static int append_ia5(STACK_OF(OPENSSL_STRING) **sk,
31 const ASN1_IA5STRING *email);
33 static int ipv4_from_asc(unsigned char *v4, const char *in);
34 static int ipv6_from_asc(unsigned char *v6, const char *in);
35 static int ipv6_cb(const char *elem, int len, void *usr);
36 static int ipv6_hex(unsigned char *out, const char *in, int inlen);
38 /* Add a CONF_VALUE name value pair to stack */
40 static int x509v3_add_len_value(const char *name, const char *value,
41 size_t vallen, STACK_OF(CONF_VALUE) **extlist)
43 CONF_VALUE *vtmp = NULL;
44 char *tname = NULL, *tvalue = NULL;
45 int sk_allocated = (*extlist == NULL);
47 if (name != NULL && (tname = OPENSSL_strdup(name)) == NULL)
50 /* We don't allow embeded NUL characters */
51 if (memchr(value, 0, vallen) != NULL)
53 tvalue = OPENSSL_strndup(value, vallen);
57 if ((vtmp = OPENSSL_malloc(sizeof(*vtmp))) == NULL)
59 if (sk_allocated && (*extlist = sk_CONF_VALUE_new_null()) == NULL)
64 if (!sk_CONF_VALUE_push(*extlist, vtmp))
68 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
70 sk_CONF_VALUE_free(*extlist);
79 int X509V3_add_value(const char *name, const char *value,
80 STACK_OF(CONF_VALUE) **extlist)
82 return x509v3_add_len_value(name, value,
83 value != NULL ? strlen((const char *)value) : 0,
87 int X509V3_add_value_uchar(const char *name, const unsigned char *value,
88 STACK_OF(CONF_VALUE) **extlist)
90 return x509v3_add_len_value(name, (const char *)value,
91 value != NULL ? strlen((const char *)value) : 0,
95 int x509v3_add_len_value_uchar(const char *name, const unsigned char *value,
96 size_t vallen, STACK_OF(CONF_VALUE) **extlist)
98 return x509v3_add_len_value(name, (const char *)value, vallen, extlist);
101 /* Free function for STACK_OF(CONF_VALUE) */
103 void X509V3_conf_free(CONF_VALUE *conf)
107 OPENSSL_free(conf->name);
108 OPENSSL_free(conf->value);
109 OPENSSL_free(conf->section);
113 int X509V3_add_value_bool(const char *name, int asn1_bool,
114 STACK_OF(CONF_VALUE) **extlist)
117 return X509V3_add_value(name, "TRUE", extlist);
118 return X509V3_add_value(name, "FALSE", extlist);
121 int X509V3_add_value_bool_nf(const char *name, int asn1_bool,
122 STACK_OF(CONF_VALUE) **extlist)
125 return X509V3_add_value(name, "TRUE", extlist);
129 static char *bignum_to_string(const BIGNUM *bn)
135 * Display large numbers in hex and small numbers in decimal. Converting to
136 * decimal takes quadratic time and is no more useful than hex for large
139 if (BN_num_bits(bn) < 128)
140 return BN_bn2dec(bn);
146 len = strlen(tmp) + 3;
147 ret = OPENSSL_malloc(len);
149 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
154 /* Prepend "0x", but place it after the "-" if negative. */
156 OPENSSL_strlcpy(ret, "-0x", len);
157 OPENSSL_strlcat(ret, tmp + 1, len);
159 OPENSSL_strlcpy(ret, "0x", len);
160 OPENSSL_strlcat(ret, tmp, len);
166 char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, const ASN1_ENUMERATED *a)
168 BIGNUM *bntmp = NULL;
173 if ((bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) == NULL
174 || (strtmp = bignum_to_string(bntmp)) == NULL)
175 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
180 char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, const ASN1_INTEGER *a)
182 BIGNUM *bntmp = NULL;
187 if ((bntmp = ASN1_INTEGER_to_BN(a, NULL)) == NULL
188 || (strtmp = bignum_to_string(bntmp)) == NULL)
189 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
194 ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, const char *value)
202 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_NULL_VALUE);
207 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
210 if (value[0] == '-') {
217 if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) {
225 ret = BN_hex2bn(&bn, value);
227 ret = BN_dec2bn(&bn, value);
229 if (!ret || value[ret]) {
231 ERR_raise(ERR_LIB_X509V3, X509V3_R_BN_DEC2BN_ERROR);
235 if (isneg && BN_is_zero(bn))
238 aint = BN_to_ASN1_INTEGER(bn, NULL);
241 ERR_raise(ERR_LIB_X509V3, X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
245 aint->type |= V_ASN1_NEG;
249 int X509V3_add_value_int(const char *name, const ASN1_INTEGER *aint,
250 STACK_OF(CONF_VALUE) **extlist)
257 if ((strtmp = i2s_ASN1_INTEGER(NULL, aint)) == NULL)
259 ret = X509V3_add_value(name, strtmp, extlist);
260 OPENSSL_free(strtmp);
264 int X509V3_get_value_bool(const CONF_VALUE *value, int *asn1_bool)
268 if ((btmp = value->value) == NULL)
270 if (strcmp(btmp, "TRUE") == 0
271 || strcmp(btmp, "true") == 0
272 || strcmp(btmp, "Y") == 0
273 || strcmp(btmp, "y") == 0
274 || strcmp(btmp, "YES") == 0
275 || strcmp(btmp, "yes") == 0) {
279 if (strcmp(btmp, "FALSE") == 0
280 || strcmp(btmp, "false") == 0
281 || strcmp(btmp, "N") == 0
282 || strcmp(btmp, "n") == 0
283 || strcmp(btmp, "NO") == 0
284 || strcmp(btmp, "no") == 0) {
289 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_BOOLEAN_STRING);
290 X509V3_conf_add_error_name_value(value);
294 int X509V3_get_value_int(const CONF_VALUE *value, ASN1_INTEGER **aint)
298 if ((itmp = s2i_ASN1_INTEGER(NULL, value->value)) == NULL) {
299 X509V3_conf_add_error_name_value(value);
313 STACK_OF(CONF_VALUE) *X509V3_parse_list(const char *line)
317 STACK_OF(CONF_VALUE) *values = NULL;
321 /* We are going to modify the line so copy it first */
322 linebuf = OPENSSL_strdup(line);
323 if (linebuf == NULL) {
324 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
329 /* Go through all characters */
330 for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
338 ntmp = strip_spaces(q);
340 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_EMPTY_NAME);
344 } else if (c == ',') {
346 ntmp = strip_spaces(q);
349 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_EMPTY_NAME);
352 X509V3_add_value(ntmp, NULL, &values);
360 vtmp = strip_spaces(q);
362 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_NULL_VALUE);
365 X509V3_add_value(ntmp, vtmp, &values);
373 if (state == HDR_VALUE) {
374 vtmp = strip_spaces(q);
376 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_NULL_VALUE);
379 X509V3_add_value(ntmp, vtmp, &values);
381 ntmp = strip_spaces(q);
383 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_EMPTY_NAME);
386 X509V3_add_value(ntmp, NULL, &values);
388 OPENSSL_free(linebuf);
392 OPENSSL_free(linebuf);
393 sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
398 /* Delete leading and trailing spaces from a string */
399 static char *strip_spaces(char *name)
403 /* Skip over leading spaces */
405 while (*p && ossl_isspace(*p))
409 q = p + strlen(p) - 1;
410 while ((q != p) && ossl_isspace(*q))
421 * V2I name comparison function: returns zero if 'name' matches cmp or cmp.*
424 int ossl_v3_name_cmp(const char *name, const char *cmp)
430 if ((ret = strncmp(name, cmp, len)))
433 if (!c || (c == '.'))
438 static int sk_strcmp(const char *const *a, const char *const *b)
440 return strcmp(*a, *b);
443 STACK_OF(OPENSSL_STRING) *X509_get1_email(X509 *x)
446 STACK_OF(OPENSSL_STRING) *ret;
448 gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
449 ret = get_email(X509_get_subject_name(x), gens);
450 sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
454 STACK_OF(OPENSSL_STRING) *X509_get1_ocsp(X509 *x)
456 AUTHORITY_INFO_ACCESS *info;
457 STACK_OF(OPENSSL_STRING) *ret = NULL;
460 info = X509_get_ext_d2i(x, NID_info_access, NULL, NULL);
463 for (i = 0; i < sk_ACCESS_DESCRIPTION_num(info); i++) {
464 ACCESS_DESCRIPTION *ad = sk_ACCESS_DESCRIPTION_value(info, i);
465 if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
466 if (ad->location->type == GEN_URI) {
468 (&ret, ad->location->d.uniformResourceIdentifier))
473 AUTHORITY_INFO_ACCESS_free(info);
477 STACK_OF(OPENSSL_STRING) *X509_REQ_get1_email(X509_REQ *x)
480 STACK_OF(X509_EXTENSION) *exts;
481 STACK_OF(OPENSSL_STRING) *ret;
483 exts = X509_REQ_get_extensions(x);
484 gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);
485 ret = get_email(X509_REQ_get_subject_name(x), gens);
486 sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
487 sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
491 static STACK_OF(OPENSSL_STRING) *get_email(const X509_NAME *name,
494 STACK_OF(OPENSSL_STRING) *ret = NULL;
496 const ASN1_IA5STRING *email;
500 /* Now add any email address(es) to STACK */
501 /* First supplied X509_NAME */
502 while ((i = X509_NAME_get_index_by_NID(name,
503 NID_pkcs9_emailAddress, i)) >= 0) {
504 ne = X509_NAME_get_entry(name, i);
505 email = X509_NAME_ENTRY_get_data(ne);
506 if (!append_ia5(&ret, email))
509 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
510 gen = sk_GENERAL_NAME_value(gens, i);
511 if (gen->type != GEN_EMAIL)
513 if (!append_ia5(&ret, gen->d.ia5))
519 static void str_free(OPENSSL_STRING str)
524 static int append_ia5(STACK_OF(OPENSSL_STRING) **sk,
525 const ASN1_IA5STRING *email)
529 /* First some sanity checks */
530 if (email->type != V_ASN1_IA5STRING)
532 if (email->data == NULL || email->length == 0)
534 if (memchr(email->data, 0, email->length) != NULL)
537 *sk = sk_OPENSSL_STRING_new(sk_strcmp);
541 emtmp = OPENSSL_strndup((char *)email->data, email->length);
543 X509_email_free(*sk);
548 /* Don't add duplicates */
549 if (sk_OPENSSL_STRING_find(*sk, emtmp) != -1) {
553 if (!sk_OPENSSL_STRING_push(*sk, emtmp)) {
554 OPENSSL_free(emtmp); /* free on push failure */
555 X509_email_free(*sk);
562 void X509_email_free(STACK_OF(OPENSSL_STRING) *sk)
564 sk_OPENSSL_STRING_pop_free(sk, str_free);
567 typedef int (*equal_fn) (const unsigned char *pattern, size_t pattern_len,
568 const unsigned char *subject, size_t subject_len,
571 /* Skip pattern prefix to match "wildcard" subject */
572 static void skip_prefix(const unsigned char **p, size_t *plen,
576 const unsigned char *pattern = *p;
577 size_t pattern_len = *plen;
580 * If subject starts with a leading '.' followed by more octets, and
581 * pattern is longer, compare just an equal-length suffix with the
582 * full subject (starting at the '.'), provided the prefix contains
585 if ((flags & _X509_CHECK_FLAG_DOT_SUBDOMAINS) == 0)
588 while (pattern_len > subject_len && *pattern) {
589 if ((flags & X509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS) &&
596 /* Skip if entire prefix acceptable */
597 if (pattern_len == subject_len) {
603 /* Compare while ASCII ignoring case. */
604 static int equal_nocase(const unsigned char *pattern, size_t pattern_len,
605 const unsigned char *subject, size_t subject_len,
608 skip_prefix(&pattern, &pattern_len, subject_len, flags);
609 if (pattern_len != subject_len)
611 while (pattern_len != 0) {
612 unsigned char l = *pattern;
613 unsigned char r = *subject;
615 /* The pattern must not contain NUL characters. */
619 if ('A' <= l && l <= 'Z')
621 if ('A' <= r && r <= 'Z')
633 /* Compare using memcmp. */
634 static int equal_case(const unsigned char *pattern, size_t pattern_len,
635 const unsigned char *subject, size_t subject_len,
638 skip_prefix(&pattern, &pattern_len, subject_len, flags);
639 if (pattern_len != subject_len)
641 return !memcmp(pattern, subject, pattern_len);
645 * RFC 5280, section 7.5, requires that only the domain is compared in a
646 * case-insensitive manner.
648 static int equal_email(const unsigned char *a, size_t a_len,
649 const unsigned char *b, size_t b_len,
650 unsigned int unused_flags)
657 * We search backwards for the '@' character, so that we do not have to
658 * deal with quoted local-parts. The domain part is compared in a
659 * case-insensitive manner.
663 if (a[i] == '@' || b[i] == '@') {
664 if (!equal_nocase(a + i, a_len - i, b + i, a_len - i, 0))
671 return equal_case(a, i, b, i, 0);
675 * Compare the prefix and suffix with the subject, and check that the
676 * characters in-between are valid.
678 static int wildcard_match(const unsigned char *prefix, size_t prefix_len,
679 const unsigned char *suffix, size_t suffix_len,
680 const unsigned char *subject, size_t subject_len,
683 const unsigned char *wildcard_start;
684 const unsigned char *wildcard_end;
685 const unsigned char *p;
689 if (subject_len < prefix_len + suffix_len)
691 if (!equal_nocase(prefix, prefix_len, subject, prefix_len, flags))
693 wildcard_start = subject + prefix_len;
694 wildcard_end = subject + (subject_len - suffix_len);
695 if (!equal_nocase(wildcard_end, suffix_len, suffix, suffix_len, flags))
698 * If the wildcard makes up the entire first label, it must match at
699 * least one character.
701 if (prefix_len == 0 && *suffix == '.') {
702 if (wildcard_start == wildcard_end)
705 if (flags & X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS)
708 /* IDNA labels cannot match partial wildcards */
710 subject_len >= 4 && strncasecmp((char *)subject, "xn--", 4) == 0)
712 /* The wildcard may match a literal '*' */
713 if (wildcard_end == wildcard_start + 1 && *wildcard_start == '*')
716 * Check that the part matched by the wildcard contains only
717 * permitted characters and only matches a single label unless
718 * allow_multi is set.
720 for (p = wildcard_start; p != wildcard_end; ++p)
721 if (!(('0' <= *p && *p <= '9') ||
722 ('A' <= *p && *p <= 'Z') ||
723 ('a' <= *p && *p <= 'z') ||
724 *p == '-' || (allow_multi && *p == '.')))
729 #define LABEL_START (1 << 0)
730 #define LABEL_END (1 << 1)
731 #define LABEL_HYPHEN (1 << 2)
732 #define LABEL_IDNA (1 << 3)
734 static const unsigned char *valid_star(const unsigned char *p, size_t len,
737 const unsigned char *star = 0;
739 int state = LABEL_START;
742 for (i = 0; i < len; ++i) {
744 * Locate first and only legal wildcard, either at the start
745 * or end of a non-IDNA first and not final label.
748 int atstart = (state & LABEL_START);
749 int atend = (i == len - 1 || p[i + 1] == '.');
751 * At most one wildcard per pattern.
752 * No wildcards in IDNA labels.
753 * No wildcards after the first label.
755 if (star != NULL || (state & LABEL_IDNA) != 0 || dots)
757 /* Only full-label '*.example.com' wildcards? */
758 if ((flags & X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS)
759 && (!atstart || !atend))
761 /* No 'foo*bar' wildcards */
762 if (!atstart && !atend)
765 state &= ~LABEL_START;
766 } else if (('a' <= p[i] && p[i] <= 'z')
767 || ('A' <= p[i] && p[i] <= 'Z')
768 || ('0' <= p[i] && p[i] <= '9')) {
769 if ((state & LABEL_START) != 0
770 && len - i >= 4 && strncasecmp((char *)&p[i], "xn--", 4) == 0)
772 state &= ~(LABEL_HYPHEN | LABEL_START);
773 } else if (p[i] == '.') {
774 if ((state & (LABEL_HYPHEN | LABEL_START)) != 0)
778 } else if (p[i] == '-') {
779 /* no domain/subdomain starts with '-' */
780 if ((state & LABEL_START) != 0)
782 state |= LABEL_HYPHEN;
789 * The final label must not end in a hyphen or ".", and
790 * there must be at least two dots after the star.
792 if ((state & (LABEL_START | LABEL_HYPHEN)) != 0 || dots < 2)
797 /* Compare using wildcards. */
798 static int equal_wildcard(const unsigned char *pattern, size_t pattern_len,
799 const unsigned char *subject, size_t subject_len,
802 const unsigned char *star = NULL;
805 * Subject names starting with '.' can only match a wildcard pattern
806 * via a subject sub-domain pattern suffix match.
808 if (!(subject_len > 1 && subject[0] == '.'))
809 star = valid_star(pattern, pattern_len, flags);
811 return equal_nocase(pattern, pattern_len,
812 subject, subject_len, flags);
813 return wildcard_match(pattern, star - pattern,
814 star + 1, (pattern + pattern_len) - star - 1,
815 subject, subject_len, flags);
819 * Compare an ASN1_STRING to a supplied string. If they match return 1. If
820 * cmp_type > 0 only compare if string matches the type, otherwise convert it
824 static int do_check_string(const ASN1_STRING *a, int cmp_type, equal_fn equal,
825 unsigned int flags, const char *b, size_t blen,
830 if (!a->data || !a->length)
833 if (cmp_type != a->type)
835 if (cmp_type == V_ASN1_IA5STRING)
836 rv = equal(a->data, a->length, (unsigned char *)b, blen, flags);
837 else if (a->length == (int)blen && !memcmp(a->data, b, blen))
839 if (rv > 0 && peername != NULL) {
840 *peername = OPENSSL_strndup((char *)a->data, a->length);
841 if (*peername == NULL)
847 astrlen = ASN1_STRING_to_UTF8(&astr, a);
850 * -1 could be an internal malloc failure or a decoding error from
851 * malformed input; we can't distinguish.
855 rv = equal(astr, astrlen, (unsigned char *)b, blen, flags);
856 if (rv > 0 && peername != NULL) {
857 *peername = OPENSSL_strndup((char *)astr, astrlen);
858 if (*peername == NULL) {
868 static int do_x509_check(X509 *x, const char *chk, size_t chklen,
869 unsigned int flags, int check_type, char **peername)
871 GENERAL_NAMES *gens = NULL;
872 const X509_NAME *name = NULL;
874 int cnid = NID_undef;
880 /* See below, this flag is internal-only */
881 flags &= ~_X509_CHECK_FLAG_DOT_SUBDOMAINS;
882 if (check_type == GEN_EMAIL) {
883 cnid = NID_pkcs9_emailAddress;
884 alt_type = V_ASN1_IA5STRING;
886 } else if (check_type == GEN_DNS) {
887 cnid = NID_commonName;
888 /* Implicit client-side DNS sub-domain pattern */
889 if (chklen > 1 && chk[0] == '.')
890 flags |= _X509_CHECK_FLAG_DOT_SUBDOMAINS;
891 alt_type = V_ASN1_IA5STRING;
892 if (flags & X509_CHECK_FLAG_NO_WILDCARDS)
893 equal = equal_nocase;
895 equal = equal_wildcard;
897 alt_type = V_ASN1_OCTET_STRING;
902 chklen = strlen(chk);
904 gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
906 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
910 gen = sk_GENERAL_NAME_value(gens, i);
911 if ((gen->type == GEN_OTHERNAME) && (check_type == GEN_EMAIL)) {
912 if (OBJ_obj2nid(gen->d.otherName->type_id) ==
913 NID_id_on_SmtpUTF8Mailbox) {
917 * If it is not a UTF8String then that is unexpected and we
918 * treat it as no match
920 if (gen->d.otherName->value->type == V_ASN1_UTF8STRING) {
921 cstr = gen->d.otherName->value->value.utf8string;
923 /* Positive on success, negative on error! */
924 if ((rv = do_check_string(cstr, 0, equal, flags,
925 chk, chklen, peername)) != 0)
931 if ((gen->type != check_type) && (gen->type != GEN_OTHERNAME))
935 if (check_type == GEN_EMAIL)
936 cstr = gen->d.rfc822Name;
937 else if (check_type == GEN_DNS)
938 cstr = gen->d.dNSName;
940 cstr = gen->d.iPAddress;
941 /* Positive on success, negative on error! */
942 if ((rv = do_check_string(cstr, alt_type, equal, flags,
943 chk, chklen, peername)) != 0)
946 GENERAL_NAMES_free(gens);
949 if (san_present && !(flags & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT))
953 /* We're done if CN-ID is not pertinent */
954 if (cnid == NID_undef || (flags & X509_CHECK_FLAG_NEVER_CHECK_SUBJECT))
958 name = X509_get_subject_name(x);
959 while ((i = X509_NAME_get_index_by_NID(name, cnid, i)) >= 0) {
960 const X509_NAME_ENTRY *ne = X509_NAME_get_entry(name, i);
961 const ASN1_STRING *str = X509_NAME_ENTRY_get_data(ne);
963 /* Positive on success, negative on error! */
964 if ((rv = do_check_string(str, -1, equal, flags,
965 chk, chklen, peername)) != 0)
971 int X509_check_host(X509 *x, const char *chk, size_t chklen,
972 unsigned int flags, char **peername)
977 * Embedded NULs are disallowed, except as the last character of a
978 * string of length 2 or more (tolerate caller including terminating
979 * NUL in string length).
982 chklen = strlen(chk);
983 else if (memchr(chk, '\0', chklen > 1 ? chklen - 1 : chklen))
985 if (chklen > 1 && chk[chklen - 1] == '\0')
987 return do_x509_check(x, chk, chklen, flags, GEN_DNS, peername);
990 int X509_check_email(X509 *x, const char *chk, size_t chklen,
996 * Embedded NULs are disallowed, except as the last character of a
997 * string of length 2 or more (tolerate caller including terminating
998 * NUL in string length).
1001 chklen = strlen((char *)chk);
1002 else if (memchr(chk, '\0', chklen > 1 ? chklen - 1 : chklen))
1004 if (chklen > 1 && chk[chklen - 1] == '\0')
1006 return do_x509_check(x, chk, chklen, flags, GEN_EMAIL, NULL);
1009 int X509_check_ip(X509 *x, const unsigned char *chk, size_t chklen,
1014 return do_x509_check(x, (char *)chk, chklen, flags, GEN_IPADD, NULL);
1017 int X509_check_ip_asc(X509 *x, const char *ipasc, unsigned int flags)
1019 unsigned char ipout[16];
1024 iplen = (size_t)ossl_a2i_ipadd(ipout, ipasc);
1027 return do_x509_check(x, (char *)ipout, iplen, flags, GEN_IPADD, NULL);
1030 char *ossl_ipaddr_to_asc(unsigned char *p, int len)
1033 * 40 is enough space for the longest IPv6 address + nul terminator byte
1034 * XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX\0
1037 int i = 0, remain = 0, bytes = 0;
1041 BIO_snprintf(buf, sizeof(buf), "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
1044 for (out = buf, i = 8, remain = sizeof(buf);
1045 i-- > 0 && bytes >= 0;
1046 remain -= bytes, out += bytes) {
1047 const char *template = (i > 0 ? "%X:" : "%X");
1049 bytes = BIO_snprintf(out, remain, template, p[0] << 8 | p[1]);
1054 BIO_snprintf(buf, sizeof(buf), "<invalid length=%d>", len);
1057 return OPENSSL_strdup(buf);
1061 * Convert IP addresses both IPv4 and IPv6 into an OCTET STRING compatible
1065 ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc)
1067 unsigned char ipout[16];
1068 ASN1_OCTET_STRING *ret;
1071 /* If string contains a ':' assume IPv6 */
1073 iplen = ossl_a2i_ipadd(ipout, ipasc);
1078 ret = ASN1_OCTET_STRING_new();
1081 if (!ASN1_OCTET_STRING_set(ret, ipout, iplen)) {
1082 ASN1_OCTET_STRING_free(ret);
1088 ASN1_OCTET_STRING *a2i_IPADDRESS_NC(const char *ipasc)
1090 ASN1_OCTET_STRING *ret = NULL;
1091 unsigned char ipout[32];
1092 char *iptmp = NULL, *p;
1095 p = strchr(ipasc, '/');
1098 iptmp = OPENSSL_strdup(ipasc);
1101 p = iptmp + (p - ipasc);
1104 iplen1 = ossl_a2i_ipadd(ipout, iptmp);
1109 iplen2 = ossl_a2i_ipadd(ipout + iplen1, p);
1111 OPENSSL_free(iptmp);
1114 if (!iplen2 || (iplen1 != iplen2))
1117 ret = ASN1_OCTET_STRING_new();
1120 if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
1126 OPENSSL_free(iptmp);
1127 ASN1_OCTET_STRING_free(ret);
1131 int ossl_a2i_ipadd(unsigned char *ipout, const char *ipasc)
1133 /* If string contains a ':' assume IPv6 */
1135 if (strchr(ipasc, ':')) {
1136 if (!ipv6_from_asc(ipout, ipasc))
1140 if (!ipv4_from_asc(ipout, ipasc))
1146 static int ipv4_from_asc(unsigned char *v4, const char *in)
1149 int a0, a1, a2, a3, n;
1151 if (sscanf(in, "%d.%d.%d.%d%n", &a0, &a1, &a2, &a3, &n) != 4)
1153 if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255)
1154 || (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
1157 if (!(*p == '\0' || ossl_isspace(*p)))
1167 /* Temporary store for IPV6 output */
1168 unsigned char tmp[16];
1169 /* Total number of bytes in tmp */
1171 /* The position of a zero (corresponding to '::') */
1173 /* Number of zeroes */
1177 static int ipv6_from_asc(unsigned char *v6, const char *in)
1182 v6stat.zero_pos = -1;
1183 v6stat.zero_cnt = 0;
1185 * Treat the IPv6 representation as a list of values separated by ':'.
1186 * The presence of a '::' will parse as one, two or three zero length
1189 if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
1192 /* Now for some sanity checks */
1194 if (v6stat.zero_pos == -1) {
1195 /* If no '::' must have exactly 16 bytes */
1196 if (v6stat.total != 16)
1199 /* If '::' must have less than 16 bytes */
1200 if (v6stat.total == 16)
1202 /* More than three zeroes is an error */
1203 if (v6stat.zero_cnt > 3) {
1205 /* Can only have three zeroes if nothing else present */
1206 } else if (v6stat.zero_cnt == 3) {
1207 if (v6stat.total > 0)
1209 } else if (v6stat.zero_cnt == 2) {
1210 /* Can only have two zeroes if at start or end */
1211 if ((v6stat.zero_pos != 0)
1212 && (v6stat.zero_pos != v6stat.total))
1215 /* Can only have one zero if *not* start or end */
1216 if ((v6stat.zero_pos == 0)
1217 || (v6stat.zero_pos == v6stat.total))
1224 if (v6stat.zero_pos >= 0) {
1225 /* Copy initial part */
1226 memcpy(v6, v6stat.tmp, v6stat.zero_pos);
1228 memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
1229 /* Copy final part */
1230 if (v6stat.total != v6stat.zero_pos)
1231 memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
1232 v6stat.tmp + v6stat.zero_pos,
1233 v6stat.total - v6stat.zero_pos);
1235 memcpy(v6, v6stat.tmp, 16);
1241 static int ipv6_cb(const char *elem, int len, void *usr)
1245 /* Error if 16 bytes written */
1249 /* Zero length element, corresponds to '::' */
1250 if (s->zero_pos == -1)
1251 s->zero_pos = s->total;
1252 /* If we've already got a :: its an error */
1253 else if (s->zero_pos != s->total)
1257 /* If more than 4 characters could be final a.b.c.d form */
1259 /* Need at least 4 bytes left */
1262 /* Must be end of string */
1265 if (!ipv4_from_asc(s->tmp + s->total, elem))
1269 if (!ipv6_hex(s->tmp + s->total, elem, len))
1278 * Convert a string of up to 4 hex digits into the corresponding IPv6 form.
1281 static int ipv6_hex(unsigned char *out, const char *in, int inlen)
1284 unsigned int num = 0;
1292 x = OPENSSL_hexchar2int(c);
1298 out[1] = num & 0xff;
1302 int X509V3_NAME_from_section(X509_NAME *nm, STACK_OF(CONF_VALUE) *dn_sk,
1303 unsigned long chtype)
1306 int i, mval, spec_char, plus_char;
1312 for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++) {
1313 v = sk_CONF_VALUE_value(dn_sk, i);
1316 * Skip past any leading X. X: X, etc to allow for multiple instances
1318 for (p = type; *p; p++) {
1319 #ifndef CHARSET_EBCDIC
1320 spec_char = ((*p == ':') || (*p == ',') || (*p == '.'));
1322 spec_char = ((*p == os_toascii[':']) || (*p == os_toascii[','])
1323 || (*p == os_toascii['.']));
1332 #ifndef CHARSET_EBCDIC
1333 plus_char = (*type == '+');
1335 plus_char = (*type == os_toascii['+']);
1343 if (!X509_NAME_add_entry_by_txt(nm, type, chtype,
1344 (unsigned char *)v->value, -1, -1,