2 * Copyright 1999-2022 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 if (!X509V3_add_value(ntmp, NULL, &values)) {
362 vtmp = strip_spaces(q);
364 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_NULL_VALUE);
367 if (!X509V3_add_value(ntmp, vtmp, &values)) {
377 if (state == HDR_VALUE) {
378 vtmp = strip_spaces(q);
380 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_NULL_VALUE);
383 if (!X509V3_add_value(ntmp, vtmp, &values)) {
387 ntmp = strip_spaces(q);
389 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_EMPTY_NAME);
392 if (!X509V3_add_value(ntmp, NULL, &values)) {
396 OPENSSL_free(linebuf);
400 OPENSSL_free(linebuf);
401 sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
406 /* Delete leading and trailing spaces from a string */
407 static char *strip_spaces(char *name)
411 /* Skip over leading spaces */
413 while (*p && ossl_isspace(*p))
417 q = p + strlen(p) - 1;
418 while ((q != p) && ossl_isspace(*q))
429 * V2I name comparison function: returns zero if 'name' matches cmp or cmp.*
432 int ossl_v3_name_cmp(const char *name, const char *cmp)
438 if ((ret = strncmp(name, cmp, len)))
441 if (!c || (c == '.'))
446 static int sk_strcmp(const char *const *a, const char *const *b)
448 return strcmp(*a, *b);
451 STACK_OF(OPENSSL_STRING) *X509_get1_email(X509 *x)
454 STACK_OF(OPENSSL_STRING) *ret;
456 gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
457 ret = get_email(X509_get_subject_name(x), gens);
458 sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
462 STACK_OF(OPENSSL_STRING) *X509_get1_ocsp(X509 *x)
464 AUTHORITY_INFO_ACCESS *info;
465 STACK_OF(OPENSSL_STRING) *ret = NULL;
468 info = X509_get_ext_d2i(x, NID_info_access, NULL, NULL);
471 for (i = 0; i < sk_ACCESS_DESCRIPTION_num(info); i++) {
472 ACCESS_DESCRIPTION *ad = sk_ACCESS_DESCRIPTION_value(info, i);
473 if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
474 if (ad->location->type == GEN_URI) {
476 (&ret, ad->location->d.uniformResourceIdentifier))
481 AUTHORITY_INFO_ACCESS_free(info);
485 STACK_OF(OPENSSL_STRING) *X509_REQ_get1_email(X509_REQ *x)
488 STACK_OF(X509_EXTENSION) *exts;
489 STACK_OF(OPENSSL_STRING) *ret;
491 exts = X509_REQ_get_extensions(x);
492 gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);
493 ret = get_email(X509_REQ_get_subject_name(x), gens);
494 sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
495 sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
499 static STACK_OF(OPENSSL_STRING) *get_email(const X509_NAME *name,
502 STACK_OF(OPENSSL_STRING) *ret = NULL;
504 const ASN1_IA5STRING *email;
508 /* Now add any email address(es) to STACK */
509 /* First supplied X509_NAME */
510 while ((i = X509_NAME_get_index_by_NID(name,
511 NID_pkcs9_emailAddress, i)) >= 0) {
512 ne = X509_NAME_get_entry(name, i);
513 email = X509_NAME_ENTRY_get_data(ne);
514 if (!append_ia5(&ret, email))
517 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
518 gen = sk_GENERAL_NAME_value(gens, i);
519 if (gen->type != GEN_EMAIL)
521 if (!append_ia5(&ret, gen->d.ia5))
527 static void str_free(OPENSSL_STRING str)
532 static int append_ia5(STACK_OF(OPENSSL_STRING) **sk,
533 const ASN1_IA5STRING *email)
537 /* First some sanity checks */
538 if (email->type != V_ASN1_IA5STRING)
540 if (email->data == NULL || email->length == 0)
542 if (memchr(email->data, 0, email->length) != NULL)
545 *sk = sk_OPENSSL_STRING_new(sk_strcmp);
549 emtmp = OPENSSL_strndup((char *)email->data, email->length);
551 X509_email_free(*sk);
556 /* Don't add duplicates */
557 if (sk_OPENSSL_STRING_find(*sk, emtmp) != -1) {
561 if (!sk_OPENSSL_STRING_push(*sk, emtmp)) {
562 OPENSSL_free(emtmp); /* free on push failure */
563 X509_email_free(*sk);
570 void X509_email_free(STACK_OF(OPENSSL_STRING) *sk)
572 sk_OPENSSL_STRING_pop_free(sk, str_free);
575 typedef int (*equal_fn) (const unsigned char *pattern, size_t pattern_len,
576 const unsigned char *subject, size_t subject_len,
579 /* Skip pattern prefix to match "wildcard" subject */
580 static void skip_prefix(const unsigned char **p, size_t *plen,
584 const unsigned char *pattern = *p;
585 size_t pattern_len = *plen;
588 * If subject starts with a leading '.' followed by more octets, and
589 * pattern is longer, compare just an equal-length suffix with the
590 * full subject (starting at the '.'), provided the prefix contains
593 if ((flags & _X509_CHECK_FLAG_DOT_SUBDOMAINS) == 0)
596 while (pattern_len > subject_len && *pattern) {
597 if ((flags & X509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS) &&
604 /* Skip if entire prefix acceptable */
605 if (pattern_len == subject_len) {
611 /* Compare while ASCII ignoring case. */
612 static int equal_nocase(const unsigned char *pattern, size_t pattern_len,
613 const unsigned char *subject, size_t subject_len,
616 skip_prefix(&pattern, &pattern_len, subject_len, flags);
617 if (pattern_len != subject_len)
619 while (pattern_len != 0) {
620 unsigned char l = *pattern;
621 unsigned char r = *subject;
623 /* The pattern must not contain NUL characters. */
627 if ('A' <= l && l <= 'Z')
629 if ('A' <= r && r <= 'Z')
641 /* Compare using memcmp. */
642 static int equal_case(const unsigned char *pattern, size_t pattern_len,
643 const unsigned char *subject, size_t subject_len,
646 skip_prefix(&pattern, &pattern_len, subject_len, flags);
647 if (pattern_len != subject_len)
649 return !memcmp(pattern, subject, pattern_len);
653 * RFC 5280, section 7.5, requires that only the domain is compared in a
654 * case-insensitive manner.
656 static int equal_email(const unsigned char *a, size_t a_len,
657 const unsigned char *b, size_t b_len,
658 unsigned int unused_flags)
665 * We search backwards for the '@' character, so that we do not have to
666 * deal with quoted local-parts. The domain part is compared in a
667 * case-insensitive manner.
671 if (a[i] == '@' || b[i] == '@') {
672 if (!equal_nocase(a + i, a_len - i, b + i, a_len - i, 0))
679 return equal_case(a, i, b, i, 0);
683 * Compare the prefix and suffix with the subject, and check that the
684 * characters in-between are valid.
686 static int wildcard_match(const unsigned char *prefix, size_t prefix_len,
687 const unsigned char *suffix, size_t suffix_len,
688 const unsigned char *subject, size_t subject_len,
691 const unsigned char *wildcard_start;
692 const unsigned char *wildcard_end;
693 const unsigned char *p;
697 if (subject_len < prefix_len + suffix_len)
699 if (!equal_nocase(prefix, prefix_len, subject, prefix_len, flags))
701 wildcard_start = subject + prefix_len;
702 wildcard_end = subject + (subject_len - suffix_len);
703 if (!equal_nocase(wildcard_end, suffix_len, suffix, suffix_len, flags))
706 * If the wildcard makes up the entire first label, it must match at
707 * least one character.
709 if (prefix_len == 0 && *suffix == '.') {
710 if (wildcard_start == wildcard_end)
713 if (flags & X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS)
716 /* IDNA labels cannot match partial wildcards */
718 subject_len >= 4 && strncasecmp((char *)subject, "xn--", 4) == 0)
720 /* The wildcard may match a literal '*' */
721 if (wildcard_end == wildcard_start + 1 && *wildcard_start == '*')
724 * Check that the part matched by the wildcard contains only
725 * permitted characters and only matches a single label unless
726 * allow_multi is set.
728 for (p = wildcard_start; p != wildcard_end; ++p)
729 if (!(('0' <= *p && *p <= '9') ||
730 ('A' <= *p && *p <= 'Z') ||
731 ('a' <= *p && *p <= 'z') ||
732 *p == '-' || (allow_multi && *p == '.')))
737 #define LABEL_START (1 << 0)
738 #define LABEL_END (1 << 1)
739 #define LABEL_HYPHEN (1 << 2)
740 #define LABEL_IDNA (1 << 3)
742 static const unsigned char *valid_star(const unsigned char *p, size_t len,
745 const unsigned char *star = 0;
747 int state = LABEL_START;
750 for (i = 0; i < len; ++i) {
752 * Locate first and only legal wildcard, either at the start
753 * or end of a non-IDNA first and not final label.
756 int atstart = (state & LABEL_START);
757 int atend = (i == len - 1 || p[i + 1] == '.');
759 * At most one wildcard per pattern.
760 * No wildcards in IDNA labels.
761 * No wildcards after the first label.
763 if (star != NULL || (state & LABEL_IDNA) != 0 || dots)
765 /* Only full-label '*.example.com' wildcards? */
766 if ((flags & X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS)
767 && (!atstart || !atend))
769 /* No 'foo*bar' wildcards */
770 if (!atstart && !atend)
773 state &= ~LABEL_START;
774 } else if (('a' <= p[i] && p[i] <= 'z')
775 || ('A' <= p[i] && p[i] <= 'Z')
776 || ('0' <= p[i] && p[i] <= '9')) {
777 if ((state & LABEL_START) != 0
778 && len - i >= 4 && strncasecmp((char *)&p[i], "xn--", 4) == 0)
780 state &= ~(LABEL_HYPHEN | LABEL_START);
781 } else if (p[i] == '.') {
782 if ((state & (LABEL_HYPHEN | LABEL_START)) != 0)
786 } else if (p[i] == '-') {
787 /* no domain/subdomain starts with '-' */
788 if ((state & LABEL_START) != 0)
790 state |= LABEL_HYPHEN;
797 * The final label must not end in a hyphen or ".", and
798 * there must be at least two dots after the star.
800 if ((state & (LABEL_START | LABEL_HYPHEN)) != 0 || dots < 2)
805 /* Compare using wildcards. */
806 static int equal_wildcard(const unsigned char *pattern, size_t pattern_len,
807 const unsigned char *subject, size_t subject_len,
810 const unsigned char *star = NULL;
813 * Subject names starting with '.' can only match a wildcard pattern
814 * via a subject sub-domain pattern suffix match.
816 if (!(subject_len > 1 && subject[0] == '.'))
817 star = valid_star(pattern, pattern_len, flags);
819 return equal_nocase(pattern, pattern_len,
820 subject, subject_len, flags);
821 return wildcard_match(pattern, star - pattern,
822 star + 1, (pattern + pattern_len) - star - 1,
823 subject, subject_len, flags);
827 * Compare an ASN1_STRING to a supplied string. If they match return 1. If
828 * cmp_type > 0 only compare if string matches the type, otherwise convert it
832 static int do_check_string(const ASN1_STRING *a, int cmp_type, equal_fn equal,
833 unsigned int flags, const char *b, size_t blen,
838 if (!a->data || !a->length)
841 if (cmp_type != a->type)
843 if (cmp_type == V_ASN1_IA5STRING)
844 rv = equal(a->data, a->length, (unsigned char *)b, blen, flags);
845 else if (a->length == (int)blen && !memcmp(a->data, b, blen))
847 if (rv > 0 && peername != NULL) {
848 *peername = OPENSSL_strndup((char *)a->data, a->length);
849 if (*peername == NULL)
855 astrlen = ASN1_STRING_to_UTF8(&astr, a);
858 * -1 could be an internal malloc failure or a decoding error from
859 * malformed input; we can't distinguish.
863 rv = equal(astr, astrlen, (unsigned char *)b, blen, flags);
864 if (rv > 0 && peername != NULL) {
865 *peername = OPENSSL_strndup((char *)astr, astrlen);
866 if (*peername == NULL) {
876 static int do_x509_check(X509 *x, const char *chk, size_t chklen,
877 unsigned int flags, int check_type, char **peername)
879 GENERAL_NAMES *gens = NULL;
880 const X509_NAME *name = NULL;
882 int cnid = NID_undef;
888 /* See below, this flag is internal-only */
889 flags &= ~_X509_CHECK_FLAG_DOT_SUBDOMAINS;
890 if (check_type == GEN_EMAIL) {
891 cnid = NID_pkcs9_emailAddress;
892 alt_type = V_ASN1_IA5STRING;
894 } else if (check_type == GEN_DNS) {
895 cnid = NID_commonName;
896 /* Implicit client-side DNS sub-domain pattern */
897 if (chklen > 1 && chk[0] == '.')
898 flags |= _X509_CHECK_FLAG_DOT_SUBDOMAINS;
899 alt_type = V_ASN1_IA5STRING;
900 if (flags & X509_CHECK_FLAG_NO_WILDCARDS)
901 equal = equal_nocase;
903 equal = equal_wildcard;
905 alt_type = V_ASN1_OCTET_STRING;
910 chklen = strlen(chk);
912 gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
914 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
918 gen = sk_GENERAL_NAME_value(gens, i);
919 if ((gen->type == GEN_OTHERNAME) && (check_type == GEN_EMAIL)) {
920 if (OBJ_obj2nid(gen->d.otherName->type_id) ==
921 NID_id_on_SmtpUTF8Mailbox) {
925 * If it is not a UTF8String then that is unexpected and we
926 * treat it as no match
928 if (gen->d.otherName->value->type == V_ASN1_UTF8STRING) {
929 cstr = gen->d.otherName->value->value.utf8string;
931 /* Positive on success, negative on error! */
932 if ((rv = do_check_string(cstr, 0, equal, flags,
933 chk, chklen, peername)) != 0)
939 if ((gen->type != check_type) && (gen->type != GEN_OTHERNAME))
943 if (check_type == GEN_EMAIL)
944 cstr = gen->d.rfc822Name;
945 else if (check_type == GEN_DNS)
946 cstr = gen->d.dNSName;
948 cstr = gen->d.iPAddress;
949 /* Positive on success, negative on error! */
950 if ((rv = do_check_string(cstr, alt_type, equal, flags,
951 chk, chklen, peername)) != 0)
954 GENERAL_NAMES_free(gens);
957 if (san_present && !(flags & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT))
961 /* We're done if CN-ID is not pertinent */
962 if (cnid == NID_undef || (flags & X509_CHECK_FLAG_NEVER_CHECK_SUBJECT))
966 name = X509_get_subject_name(x);
967 while ((i = X509_NAME_get_index_by_NID(name, cnid, i)) >= 0) {
968 const X509_NAME_ENTRY *ne = X509_NAME_get_entry(name, i);
969 const ASN1_STRING *str = X509_NAME_ENTRY_get_data(ne);
971 /* Positive on success, negative on error! */
972 if ((rv = do_check_string(str, -1, equal, flags,
973 chk, chklen, peername)) != 0)
979 int X509_check_host(X509 *x, const char *chk, size_t chklen,
980 unsigned int flags, char **peername)
985 * Embedded NULs are disallowed, except as the last character of a
986 * string of length 2 or more (tolerate caller including terminating
987 * NUL in string length).
990 chklen = strlen(chk);
991 else if (memchr(chk, '\0', chklen > 1 ? chklen - 1 : chklen))
993 if (chklen > 1 && chk[chklen - 1] == '\0')
995 return do_x509_check(x, chk, chklen, flags, GEN_DNS, peername);
998 int X509_check_email(X509 *x, const char *chk, size_t chklen,
1004 * Embedded NULs are disallowed, except as the last character of a
1005 * string of length 2 or more (tolerate caller including terminating
1006 * NUL in string length).
1009 chklen = strlen((char *)chk);
1010 else if (memchr(chk, '\0', chklen > 1 ? chklen - 1 : chklen))
1012 if (chklen > 1 && chk[chklen - 1] == '\0')
1014 return do_x509_check(x, chk, chklen, flags, GEN_EMAIL, NULL);
1017 int X509_check_ip(X509 *x, const unsigned char *chk, size_t chklen,
1022 return do_x509_check(x, (char *)chk, chklen, flags, GEN_IPADD, NULL);
1025 int X509_check_ip_asc(X509 *x, const char *ipasc, unsigned int flags)
1027 unsigned char ipout[16];
1032 iplen = (size_t)ossl_a2i_ipadd(ipout, ipasc);
1035 return do_x509_check(x, (char *)ipout, iplen, flags, GEN_IPADD, NULL);
1038 char *ossl_ipaddr_to_asc(unsigned char *p, int len)
1041 * 40 is enough space for the longest IPv6 address + nul terminator byte
1042 * XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX\0
1045 int i = 0, remain = 0, bytes = 0;
1049 BIO_snprintf(buf, sizeof(buf), "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
1052 for (out = buf, i = 8, remain = sizeof(buf);
1053 i-- > 0 && bytes >= 0;
1054 remain -= bytes, out += bytes) {
1055 const char *template = (i > 0 ? "%X:" : "%X");
1057 bytes = BIO_snprintf(out, remain, template, p[0] << 8 | p[1]);
1062 BIO_snprintf(buf, sizeof(buf), "<invalid length=%d>", len);
1065 return OPENSSL_strdup(buf);
1069 * Convert IP addresses both IPv4 and IPv6 into an OCTET STRING compatible
1073 ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc)
1075 unsigned char ipout[16];
1076 ASN1_OCTET_STRING *ret;
1079 /* If string contains a ':' assume IPv6 */
1081 iplen = ossl_a2i_ipadd(ipout, ipasc);
1086 ret = ASN1_OCTET_STRING_new();
1089 if (!ASN1_OCTET_STRING_set(ret, ipout, iplen)) {
1090 ASN1_OCTET_STRING_free(ret);
1096 ASN1_OCTET_STRING *a2i_IPADDRESS_NC(const char *ipasc)
1098 ASN1_OCTET_STRING *ret = NULL;
1099 unsigned char ipout[32];
1100 char *iptmp = NULL, *p;
1103 p = strchr(ipasc, '/');
1106 iptmp = OPENSSL_strdup(ipasc);
1109 p = iptmp + (p - ipasc);
1112 iplen1 = ossl_a2i_ipadd(ipout, iptmp);
1117 iplen2 = ossl_a2i_ipadd(ipout + iplen1, p);
1119 OPENSSL_free(iptmp);
1122 if (!iplen2 || (iplen1 != iplen2))
1125 ret = ASN1_OCTET_STRING_new();
1128 if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
1134 OPENSSL_free(iptmp);
1135 ASN1_OCTET_STRING_free(ret);
1139 int ossl_a2i_ipadd(unsigned char *ipout, const char *ipasc)
1141 /* If string contains a ':' assume IPv6 */
1143 if (strchr(ipasc, ':')) {
1144 if (!ipv6_from_asc(ipout, ipasc))
1148 if (!ipv4_from_asc(ipout, ipasc))
1154 static int ipv4_from_asc(unsigned char *v4, const char *in)
1157 int a0, a1, a2, a3, n;
1159 if (sscanf(in, "%d.%d.%d.%d%n", &a0, &a1, &a2, &a3, &n) != 4)
1161 if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255)
1162 || (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
1165 if (!(*p == '\0' || ossl_isspace(*p)))
1175 /* Temporary store for IPV6 output */
1176 unsigned char tmp[16];
1177 /* Total number of bytes in tmp */
1179 /* The position of a zero (corresponding to '::') */
1181 /* Number of zeroes */
1185 static int ipv6_from_asc(unsigned char *v6, const char *in)
1190 v6stat.zero_pos = -1;
1191 v6stat.zero_cnt = 0;
1193 * Treat the IPv6 representation as a list of values separated by ':'.
1194 * The presence of a '::' will parse as one, two or three zero length
1197 if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
1200 /* Now for some sanity checks */
1202 if (v6stat.zero_pos == -1) {
1203 /* If no '::' must have exactly 16 bytes */
1204 if (v6stat.total != 16)
1207 /* If '::' must have less than 16 bytes */
1208 if (v6stat.total == 16)
1210 /* More than three zeroes is an error */
1211 if (v6stat.zero_cnt > 3) {
1213 /* Can only have three zeroes if nothing else present */
1214 } else if (v6stat.zero_cnt == 3) {
1215 if (v6stat.total > 0)
1217 } else if (v6stat.zero_cnt == 2) {
1218 /* Can only have two zeroes if at start or end */
1219 if ((v6stat.zero_pos != 0)
1220 && (v6stat.zero_pos != v6stat.total))
1223 /* Can only have one zero if *not* start or end */
1224 if ((v6stat.zero_pos == 0)
1225 || (v6stat.zero_pos == v6stat.total))
1232 if (v6stat.zero_pos >= 0) {
1233 /* Copy initial part */
1234 memcpy(v6, v6stat.tmp, v6stat.zero_pos);
1236 memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
1237 /* Copy final part */
1238 if (v6stat.total != v6stat.zero_pos)
1239 memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
1240 v6stat.tmp + v6stat.zero_pos,
1241 v6stat.total - v6stat.zero_pos);
1243 memcpy(v6, v6stat.tmp, 16);
1249 static int ipv6_cb(const char *elem, int len, void *usr)
1253 /* Error if 16 bytes written */
1257 /* Zero length element, corresponds to '::' */
1258 if (s->zero_pos == -1)
1259 s->zero_pos = s->total;
1260 /* If we've already got a :: its an error */
1261 else if (s->zero_pos != s->total)
1265 /* If more than 4 characters could be final a.b.c.d form */
1267 /* Need at least 4 bytes left */
1270 /* Must be end of string */
1273 if (!ipv4_from_asc(s->tmp + s->total, elem))
1277 if (!ipv6_hex(s->tmp + s->total, elem, len))
1286 * Convert a string of up to 4 hex digits into the corresponding IPv6 form.
1289 static int ipv6_hex(unsigned char *out, const char *in, int inlen)
1292 unsigned int num = 0;
1300 x = OPENSSL_hexchar2int(c);
1306 out[1] = num & 0xff;
1310 int X509V3_NAME_from_section(X509_NAME *nm, STACK_OF(CONF_VALUE) *dn_sk,
1311 unsigned long chtype)
1314 int i, mval, spec_char, plus_char;
1320 for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++) {
1321 v = sk_CONF_VALUE_value(dn_sk, i);
1324 * Skip past any leading X. X: X, etc to allow for multiple instances
1326 for (p = type; *p; p++) {
1327 #ifndef CHARSET_EBCDIC
1328 spec_char = ((*p == ':') || (*p == ',') || (*p == '.'));
1330 spec_char = ((*p == os_toascii[':']) || (*p == os_toascii[','])
1331 || (*p == os_toascii['.']));
1340 #ifndef CHARSET_EBCDIC
1341 plus_char = (*type == '+');
1343 plus_char = (*type == os_toascii['+']);
1351 if (!X509_NAME_add_entry_by_txt(nm, type, chtype,
1352 (unsigned char *)v->value, -1, -1,