2 * Copyright 1999-2021 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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>
24 static char *strip_spaces(char *name);
25 static int sk_strcmp(const char *const *a, const char *const *b);
26 static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
28 static void str_free(OPENSSL_STRING str);
29 static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, const ASN1_IA5STRING *email);
31 static int ipv4_from_asc(unsigned char *v4, const char *in);
32 static int ipv6_from_asc(unsigned char *v6, const char *in);
33 static int ipv6_cb(const char *elem, int len, void *usr);
34 static int ipv6_hex(unsigned char *out, const char *in, int inlen);
36 /* Add a CONF_VALUE name value pair to stack */
38 static int x509v3_add_len_value(const char *name, const char *value,
39 size_t vallen, STACK_OF(CONF_VALUE) **extlist)
41 CONF_VALUE *vtmp = NULL;
42 char *tname = NULL, *tvalue = NULL;
43 int sk_allocated = (*extlist == NULL);
45 if (name != NULL && (tname = OPENSSL_strdup(name)) == NULL)
47 if (value != NULL && vallen > 0) {
49 * We tolerate a single trailing NUL character, but otherwise no
52 if (memchr(value, 0, vallen - 1) != NULL)
54 tvalue = OPENSSL_strndup(value, vallen);
58 if ((vtmp = OPENSSL_malloc(sizeof(*vtmp))) == NULL)
60 if (sk_allocated && (*extlist = sk_CONF_VALUE_new_null()) == NULL)
65 if (!sk_CONF_VALUE_push(*extlist, vtmp))
69 X509V3err(X509V3_F_X509V3_ADD_LEN_VALUE, ERR_R_MALLOC_FAILURE);
71 sk_CONF_VALUE_free(*extlist);
80 int X509V3_add_value(const char *name, const char *value,
81 STACK_OF(CONF_VALUE) **extlist)
83 return x509v3_add_len_value(name, value,
84 value != NULL ? strlen((const char *)value) : 0,
88 int X509V3_add_value_uchar(const char *name, const unsigned char *value,
89 STACK_OF(CONF_VALUE) **extlist)
91 return x509v3_add_len_value(name, (const char *)value,
92 value != NULL ? strlen((const char *)value) : 0,
96 int x509v3_add_len_value_uchar(const char *name, const unsigned char *value,
97 size_t vallen, STACK_OF(CONF_VALUE) **extlist)
99 return x509v3_add_len_value(name, (const char *)value, vallen, extlist);
102 /* Free function for STACK_OF(CONF_VALUE) */
104 void X509V3_conf_free(CONF_VALUE *conf)
108 OPENSSL_free(conf->name);
109 OPENSSL_free(conf->value);
110 OPENSSL_free(conf->section);
114 int X509V3_add_value_bool(const char *name, int asn1_bool,
115 STACK_OF(CONF_VALUE) **extlist)
118 return X509V3_add_value(name, "TRUE", extlist);
119 return X509V3_add_value(name, "FALSE", extlist);
122 int X509V3_add_value_bool_nf(const char *name, int asn1_bool,
123 STACK_OF(CONF_VALUE) **extlist)
126 return X509V3_add_value(name, "TRUE", extlist);
130 static char *bignum_to_string(const BIGNUM *bn)
136 * Display large numbers in hex and small numbers in decimal. Converting to
137 * decimal takes quadratic time and is no more useful than hex for large
140 if (BN_num_bits(bn) < 128)
141 return BN_bn2dec(bn);
147 len = strlen(tmp) + 3;
148 ret = OPENSSL_malloc(len);
150 X509V3err(X509V3_F_BIGNUM_TO_STRING, ERR_R_MALLOC_FAILURE);
155 /* Prepend "0x", but place it after the "-" if negative. */
157 OPENSSL_strlcpy(ret, "-0x", len);
158 OPENSSL_strlcat(ret, tmp + 1, len);
160 OPENSSL_strlcpy(ret, "0x", len);
161 OPENSSL_strlcat(ret, tmp, len);
167 char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, const ASN1_ENUMERATED *a)
169 BIGNUM *bntmp = NULL;
174 if ((bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) == NULL
175 || (strtmp = bignum_to_string(bntmp)) == NULL)
176 X509V3err(X509V3_F_I2S_ASN1_ENUMERATED, ERR_R_MALLOC_FAILURE);
181 char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, const ASN1_INTEGER *a)
183 BIGNUM *bntmp = NULL;
188 if ((bntmp = ASN1_INTEGER_to_BN(a, NULL)) == NULL
189 || (strtmp = bignum_to_string(bntmp)) == NULL)
190 X509V3err(X509V3_F_I2S_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
195 ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, const char *value)
202 X509V3err(X509V3_F_S2I_ASN1_INTEGER, X509V3_R_INVALID_NULL_VALUE);
207 X509V3err(X509V3_F_S2I_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
210 if (value[0] == '-') {
216 if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) {
223 ret = BN_hex2bn(&bn, value);
225 ret = BN_dec2bn(&bn, value);
227 if (!ret || value[ret]) {
229 X509V3err(X509V3_F_S2I_ASN1_INTEGER, X509V3_R_BN_DEC2BN_ERROR);
233 if (isneg && BN_is_zero(bn))
236 aint = BN_to_ASN1_INTEGER(bn, NULL);
239 X509V3err(X509V3_F_S2I_ASN1_INTEGER,
240 X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
244 aint->type |= V_ASN1_NEG;
248 int X509V3_add_value_int(const char *name, const ASN1_INTEGER *aint,
249 STACK_OF(CONF_VALUE) **extlist)
256 if ((strtmp = i2s_ASN1_INTEGER(NULL, aint)) == NULL)
258 ret = X509V3_add_value(name, strtmp, extlist);
259 OPENSSL_free(strtmp);
263 int X509V3_get_value_bool(const CONF_VALUE *value, int *asn1_bool)
267 if ((btmp = value->value) == NULL)
269 if (strcmp(btmp, "TRUE") == 0
270 || strcmp(btmp, "true") == 0
271 || strcmp(btmp, "Y") == 0
272 || strcmp(btmp, "y") == 0
273 || strcmp(btmp, "YES") == 0
274 || strcmp(btmp, "yes") == 0) {
278 if (strcmp(btmp, "FALSE") == 0
279 || strcmp(btmp, "false") == 0
280 || strcmp(btmp, "N") == 0
281 || strcmp(btmp, "n") == 0
282 || strcmp(btmp, "NO") == 0
283 || strcmp(btmp, "no") == 0) {
288 X509V3err(X509V3_F_X509V3_GET_VALUE_BOOL,
289 X509V3_R_INVALID_BOOLEAN_STRING);
290 X509V3_conf_err(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_err(value);
313 STACK_OF(CONF_VALUE) *X509V3_parse_list(const char *line)
317 STACK_OF(CONF_VALUE) *values = NULL;
320 /* We are going to modify the line so copy it first */
321 linebuf = OPENSSL_strdup(line);
322 if (linebuf == NULL) {
323 X509V3err(X509V3_F_X509V3_PARSE_LIST, ERR_R_MALLOC_FAILURE);
328 /* Go through all characters */
329 for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
337 ntmp = strip_spaces(q);
339 X509V3err(X509V3_F_X509V3_PARSE_LIST,
340 X509V3_R_INVALID_NULL_NAME);
344 } else if (c == ',') {
346 ntmp = strip_spaces(q);
349 X509V3err(X509V3_F_X509V3_PARSE_LIST,
350 X509V3_R_INVALID_NULL_NAME);
353 X509V3_add_value(ntmp, NULL, &values);
361 vtmp = strip_spaces(q);
363 X509V3err(X509V3_F_X509V3_PARSE_LIST,
364 X509V3_R_INVALID_NULL_VALUE);
367 X509V3_add_value(ntmp, vtmp, &values);
375 if (state == HDR_VALUE) {
376 vtmp = strip_spaces(q);
378 X509V3err(X509V3_F_X509V3_PARSE_LIST,
379 X509V3_R_INVALID_NULL_VALUE);
382 X509V3_add_value(ntmp, vtmp, &values);
384 ntmp = strip_spaces(q);
386 X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
389 X509V3_add_value(ntmp, NULL, &values);
391 OPENSSL_free(linebuf);
395 OPENSSL_free(linebuf);
396 sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
401 /* Delete leading and trailing spaces from a string */
402 static char *strip_spaces(char *name)
405 /* Skip over leading spaces */
407 while (*p && ossl_isspace(*p))
411 q = p + strlen(p) - 1;
412 while ((q != p) && ossl_isspace(*q))
423 * V2I name comparison function: returns zero if 'name' matches cmp or cmp.*
426 int name_cmp(const char *name, const char *cmp)
431 if ((ret = strncmp(name, cmp, len)))
434 if (!c || (c == '.'))
439 static int sk_strcmp(const char *const *a, const char *const *b)
441 return strcmp(*a, *b);
444 STACK_OF(OPENSSL_STRING) *X509_get1_email(X509 *x)
447 STACK_OF(OPENSSL_STRING) *ret;
449 gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
450 ret = get_email(X509_get_subject_name(x), gens);
451 sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
455 STACK_OF(OPENSSL_STRING) *X509_get1_ocsp(X509 *x)
457 AUTHORITY_INFO_ACCESS *info;
458 STACK_OF(OPENSSL_STRING) *ret = NULL;
461 info = X509_get_ext_d2i(x, NID_info_access, NULL, NULL);
464 for (i = 0; i < sk_ACCESS_DESCRIPTION_num(info); i++) {
465 ACCESS_DESCRIPTION *ad = sk_ACCESS_DESCRIPTION_value(info, i);
466 if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
467 if (ad->location->type == GEN_URI) {
469 (&ret, ad->location->d.uniformResourceIdentifier))
474 AUTHORITY_INFO_ACCESS_free(info);
478 STACK_OF(OPENSSL_STRING) *X509_REQ_get1_email(X509_REQ *x)
481 STACK_OF(X509_EXTENSION) *exts;
482 STACK_OF(OPENSSL_STRING) *ret;
484 exts = X509_REQ_get_extensions(x);
485 gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);
486 ret = get_email(X509_REQ_get_subject_name(x), gens);
487 sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
488 sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
492 static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
495 STACK_OF(OPENSSL_STRING) *ret = NULL;
497 const ASN1_IA5STRING *email;
501 /* Now add any email address(es) to STACK */
502 /* First supplied X509_NAME */
503 while ((i = X509_NAME_get_index_by_NID(name,
504 NID_pkcs9_emailAddress, i)) >= 0) {
505 ne = X509_NAME_get_entry(name, i);
506 email = X509_NAME_ENTRY_get_data(ne);
507 if (!append_ia5(&ret, email))
510 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
511 gen = sk_GENERAL_NAME_value(gens, i);
512 if (gen->type != GEN_EMAIL)
514 if (!append_ia5(&ret, gen->d.ia5))
520 static void str_free(OPENSSL_STRING str)
525 static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, const ASN1_IA5STRING *email)
528 /* First some sanity checks */
529 if (email->type != V_ASN1_IA5STRING)
531 if (email->data == NULL || email->length == 0)
533 if (memchr(email->data, 0, email->length) != NULL)
536 *sk = sk_OPENSSL_STRING_new(sk_strcmp);
540 emtmp = OPENSSL_strndup((char *)email->data, email->length);
544 /* Don't add duplicates */
545 if (sk_OPENSSL_STRING_find(*sk, emtmp) != -1) {
549 if (!sk_OPENSSL_STRING_push(*sk, emtmp)) {
550 OPENSSL_free(emtmp); /* free on push failure */
551 X509_email_free(*sk);
558 void X509_email_free(STACK_OF(OPENSSL_STRING) *sk)
560 sk_OPENSSL_STRING_pop_free(sk, str_free);
563 typedef int (*equal_fn) (const unsigned char *pattern, size_t pattern_len,
564 const unsigned char *subject, size_t subject_len,
567 /* Skip pattern prefix to match "wildcard" subject */
568 static void skip_prefix(const unsigned char **p, size_t *plen,
572 const unsigned char *pattern = *p;
573 size_t pattern_len = *plen;
576 * If subject starts with a leading '.' followed by more octets, and
577 * pattern is longer, compare just an equal-length suffix with the
578 * full subject (starting at the '.'), provided the prefix contains
581 if ((flags & _X509_CHECK_FLAG_DOT_SUBDOMAINS) == 0)
584 while (pattern_len > subject_len && *pattern) {
585 if ((flags & X509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS) &&
592 /* Skip if entire prefix acceptable */
593 if (pattern_len == subject_len) {
599 /* Compare while ASCII ignoring case. */
600 static int equal_nocase(const unsigned char *pattern, size_t pattern_len,
601 const unsigned char *subject, size_t subject_len,
604 skip_prefix(&pattern, &pattern_len, subject_len, flags);
605 if (pattern_len != subject_len)
607 while (pattern_len) {
608 unsigned char l = *pattern;
609 unsigned char r = *subject;
610 /* The pattern must not contain NUL characters. */
614 if ('A' <= l && l <= 'Z')
616 if ('A' <= r && r <= 'Z')
628 /* Compare using memcmp. */
629 static int equal_case(const unsigned char *pattern, size_t pattern_len,
630 const unsigned char *subject, size_t subject_len,
633 skip_prefix(&pattern, &pattern_len, subject_len, flags);
634 if (pattern_len != subject_len)
636 return !memcmp(pattern, subject, pattern_len);
640 * RFC 5280, section 7.5, requires that only the domain is compared in a
641 * case-insensitive manner.
643 static int equal_email(const unsigned char *a, size_t a_len,
644 const unsigned char *b, size_t b_len,
645 unsigned int unused_flags)
651 * We search backwards for the '@' character, so that we do not have to
652 * deal with quoted local-parts. The domain part is compared in a
653 * case-insensitive manner.
657 if (a[i] == '@' || b[i] == '@') {
658 if (!equal_nocase(a + i, a_len - i, b + i, a_len - i, 0))
665 return equal_case(a, i, b, i, 0);
669 * Compare the prefix and suffix with the subject, and check that the
670 * characters in-between are valid.
672 static int wildcard_match(const unsigned char *prefix, size_t prefix_len,
673 const unsigned char *suffix, size_t suffix_len,
674 const unsigned char *subject, size_t subject_len,
677 const unsigned char *wildcard_start;
678 const unsigned char *wildcard_end;
679 const unsigned char *p;
683 if (subject_len < prefix_len + suffix_len)
685 if (!equal_nocase(prefix, prefix_len, subject, prefix_len, flags))
687 wildcard_start = subject + prefix_len;
688 wildcard_end = subject + (subject_len - suffix_len);
689 if (!equal_nocase(wildcard_end, suffix_len, suffix, suffix_len, flags))
692 * If the wildcard makes up the entire first label, it must match at
693 * least one character.
695 if (prefix_len == 0 && *suffix == '.') {
696 if (wildcard_start == wildcard_end)
699 if (flags & X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS)
702 /* IDNA labels cannot match partial wildcards */
704 subject_len >= 4 && strncasecmp((char *)subject, "xn--", 4) == 0)
706 /* The wildcard may match a literal '*' */
707 if (wildcard_end == wildcard_start + 1 && *wildcard_start == '*')
710 * Check that the part matched by the wildcard contains only
711 * permitted characters and only matches a single label unless
712 * allow_multi is set.
714 for (p = wildcard_start; p != wildcard_end; ++p)
715 if (!(('0' <= *p && *p <= '9') ||
716 ('A' <= *p && *p <= 'Z') ||
717 ('a' <= *p && *p <= 'z') ||
718 *p == '-' || (allow_multi && *p == '.')))
723 #define LABEL_START (1 << 0)
724 #define LABEL_END (1 << 1)
725 #define LABEL_HYPHEN (1 << 2)
726 #define LABEL_IDNA (1 << 3)
728 static const unsigned char *valid_star(const unsigned char *p, size_t len,
731 const unsigned char *star = 0;
733 int state = LABEL_START;
735 for (i = 0; i < len; ++i) {
737 * Locate first and only legal wildcard, either at the start
738 * or end of a non-IDNA first and not final label.
741 int atstart = (state & LABEL_START);
742 int atend = (i == len - 1 || p[i + 1] == '.');
744 * At most one wildcard per pattern.
745 * No wildcards in IDNA labels.
746 * No wildcards after the first label.
748 if (star != NULL || (state & LABEL_IDNA) != 0 || dots)
750 /* Only full-label '*.example.com' wildcards? */
751 if ((flags & X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS)
752 && (!atstart || !atend))
754 /* No 'foo*bar' wildcards */
755 if (!atstart && !atend)
758 state &= ~LABEL_START;
759 } else if (('a' <= p[i] && p[i] <= 'z')
760 || ('A' <= p[i] && p[i] <= 'Z')
761 || ('0' <= p[i] && p[i] <= '9')) {
762 if ((state & LABEL_START) != 0
763 && len - i >= 4 && strncasecmp((char *)&p[i], "xn--", 4) == 0)
765 state &= ~(LABEL_HYPHEN | LABEL_START);
766 } else if (p[i] == '.') {
767 if ((state & (LABEL_HYPHEN | LABEL_START)) != 0)
771 } else if (p[i] == '-') {
772 /* no domain/subdomain starts with '-' */
773 if ((state & LABEL_START) != 0)
775 state |= LABEL_HYPHEN;
781 * The final label must not end in a hyphen or ".", and
782 * there must be at least two dots after the star.
784 if ((state & (LABEL_START | LABEL_HYPHEN)) != 0 || dots < 2)
789 /* Compare using wildcards. */
790 static int equal_wildcard(const unsigned char *pattern, size_t pattern_len,
791 const unsigned char *subject, size_t subject_len,
794 const unsigned char *star = NULL;
797 * Subject names starting with '.' can only match a wildcard pattern
798 * via a subject sub-domain pattern suffix match.
800 if (!(subject_len > 1 && subject[0] == '.'))
801 star = valid_star(pattern, pattern_len, flags);
803 return equal_nocase(pattern, pattern_len,
804 subject, subject_len, flags);
805 return wildcard_match(pattern, star - pattern,
806 star + 1, (pattern + pattern_len) - star - 1,
807 subject, subject_len, flags);
811 * Compare an ASN1_STRING to a supplied string. If they match return 1. If
812 * cmp_type > 0 only compare if string matches the type, otherwise convert it
816 static int do_check_string(const ASN1_STRING *a, int cmp_type, equal_fn equal,
817 unsigned int flags, const char *b, size_t blen,
822 if (!a->data || !a->length)
825 if (cmp_type != a->type)
827 if (cmp_type == V_ASN1_IA5STRING)
828 rv = equal(a->data, a->length, (unsigned char *)b, blen, flags);
829 else if (a->length == (int)blen && !memcmp(a->data, b, blen))
831 if (rv > 0 && peername)
832 *peername = OPENSSL_strndup((char *)a->data, a->length);
836 astrlen = ASN1_STRING_to_UTF8(&astr, a);
839 * -1 could be an internal malloc failure or a decoding error from
840 * malformed input; we can't distinguish.
844 rv = equal(astr, astrlen, (unsigned char *)b, blen, flags);
845 if (rv > 0 && peername)
846 *peername = OPENSSL_strndup((char *)astr, astrlen);
852 static int do_x509_check(X509 *x, const char *chk, size_t chklen,
853 unsigned int flags, int check_type, char **peername)
855 GENERAL_NAMES *gens = NULL;
856 X509_NAME *name = NULL;
858 int cnid = NID_undef;
864 /* See below, this flag is internal-only */
865 flags &= ~_X509_CHECK_FLAG_DOT_SUBDOMAINS;
866 if (check_type == GEN_EMAIL) {
867 cnid = NID_pkcs9_emailAddress;
868 alt_type = V_ASN1_IA5STRING;
870 } else if (check_type == GEN_DNS) {
871 cnid = NID_commonName;
872 /* Implicit client-side DNS sub-domain pattern */
873 if (chklen > 1 && chk[0] == '.')
874 flags |= _X509_CHECK_FLAG_DOT_SUBDOMAINS;
875 alt_type = V_ASN1_IA5STRING;
876 if (flags & X509_CHECK_FLAG_NO_WILDCARDS)
877 equal = equal_nocase;
879 equal = equal_wildcard;
881 alt_type = V_ASN1_OCTET_STRING;
886 chklen = strlen(chk);
888 gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
890 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
893 gen = sk_GENERAL_NAME_value(gens, i);
894 if (gen->type != check_type)
897 if (check_type == GEN_EMAIL)
898 cstr = gen->d.rfc822Name;
899 else if (check_type == GEN_DNS)
900 cstr = gen->d.dNSName;
902 cstr = gen->d.iPAddress;
903 /* Positive on success, negative on error! */
904 if ((rv = do_check_string(cstr, alt_type, equal, flags,
905 chk, chklen, peername)) != 0)
908 GENERAL_NAMES_free(gens);
911 if (san_present && !(flags & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT))
915 /* We're done if CN-ID is not pertinent */
916 if (cnid == NID_undef || (flags & X509_CHECK_FLAG_NEVER_CHECK_SUBJECT))
920 name = X509_get_subject_name(x);
921 while ((i = X509_NAME_get_index_by_NID(name, cnid, i)) >= 0) {
922 const X509_NAME_ENTRY *ne = X509_NAME_get_entry(name, i);
923 const ASN1_STRING *str = X509_NAME_ENTRY_get_data(ne);
925 /* Positive on success, negative on error! */
926 if ((rv = do_check_string(str, -1, equal, flags,
927 chk, chklen, peername)) != 0)
933 int X509_check_host(X509 *x, const char *chk, size_t chklen,
934 unsigned int flags, char **peername)
939 * Embedded NULs are disallowed, except as the last character of a
940 * string of length 2 or more (tolerate caller including terminating
941 * NUL in string length).
944 chklen = strlen(chk);
945 else if (memchr(chk, '\0', chklen > 1 ? chklen - 1 : chklen))
947 if (chklen > 1 && chk[chklen - 1] == '\0')
949 return do_x509_check(x, chk, chklen, flags, GEN_DNS, peername);
952 int X509_check_email(X509 *x, const char *chk, size_t chklen,
958 * Embedded NULs are disallowed, except as the last character of a
959 * string of length 2 or more (tolerate caller including terminating
960 * NUL in string length).
963 chklen = strlen((char *)chk);
964 else if (memchr(chk, '\0', chklen > 1 ? chklen - 1 : chklen))
966 if (chklen > 1 && chk[chklen - 1] == '\0')
968 return do_x509_check(x, chk, chklen, flags, GEN_EMAIL, NULL);
971 int X509_check_ip(X509 *x, const unsigned char *chk, size_t chklen,
976 return do_x509_check(x, (char *)chk, chklen, flags, GEN_IPADD, NULL);
979 int X509_check_ip_asc(X509 *x, const char *ipasc, unsigned int flags)
981 unsigned char ipout[16];
986 iplen = (size_t)a2i_ipadd(ipout, ipasc);
989 return do_x509_check(x, (char *)ipout, iplen, flags, GEN_IPADD, NULL);
993 * Convert IP addresses both IPv4 and IPv6 into an OCTET STRING compatible
997 ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc)
999 unsigned char ipout[16];
1000 ASN1_OCTET_STRING *ret;
1003 /* If string contains a ':' assume IPv6 */
1005 iplen = a2i_ipadd(ipout, ipasc);
1010 ret = ASN1_OCTET_STRING_new();
1013 if (!ASN1_OCTET_STRING_set(ret, ipout, iplen)) {
1014 ASN1_OCTET_STRING_free(ret);
1020 ASN1_OCTET_STRING *a2i_IPADDRESS_NC(const char *ipasc)
1022 ASN1_OCTET_STRING *ret = NULL;
1023 unsigned char ipout[32];
1024 char *iptmp = NULL, *p;
1026 p = strchr(ipasc, '/');
1029 iptmp = OPENSSL_strdup(ipasc);
1032 p = iptmp + (p - ipasc);
1035 iplen1 = a2i_ipadd(ipout, iptmp);
1040 iplen2 = a2i_ipadd(ipout + iplen1, p);
1042 OPENSSL_free(iptmp);
1045 if (!iplen2 || (iplen1 != iplen2))
1048 ret = ASN1_OCTET_STRING_new();
1051 if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
1057 OPENSSL_free(iptmp);
1058 ASN1_OCTET_STRING_free(ret);
1062 int a2i_ipadd(unsigned char *ipout, const char *ipasc)
1064 /* If string contains a ':' assume IPv6 */
1066 if (strchr(ipasc, ':')) {
1067 if (!ipv6_from_asc(ipout, ipasc))
1071 if (!ipv4_from_asc(ipout, ipasc))
1077 static int ipv4_from_asc(unsigned char *v4, const char *in)
1080 if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4)
1082 if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255)
1083 || (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
1093 /* Temporary store for IPV6 output */
1094 unsigned char tmp[16];
1095 /* Total number of bytes in tmp */
1097 /* The position of a zero (corresponding to '::') */
1099 /* Number of zeroes */
1103 static int ipv6_from_asc(unsigned char *v6, const char *in)
1107 v6stat.zero_pos = -1;
1108 v6stat.zero_cnt = 0;
1110 * Treat the IPv6 representation as a list of values separated by ':'.
1111 * The presence of a '::' will parse as one, two or three zero length
1114 if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
1117 /* Now for some sanity checks */
1119 if (v6stat.zero_pos == -1) {
1120 /* If no '::' must have exactly 16 bytes */
1121 if (v6stat.total != 16)
1124 /* If '::' must have less than 16 bytes */
1125 if (v6stat.total == 16)
1127 /* More than three zeroes is an error */
1128 if (v6stat.zero_cnt > 3)
1130 /* Can only have three zeroes if nothing else present */
1131 else if (v6stat.zero_cnt == 3) {
1132 if (v6stat.total > 0)
1135 /* Can only have two zeroes if at start or end */
1136 else if (v6stat.zero_cnt == 2) {
1137 if ((v6stat.zero_pos != 0)
1138 && (v6stat.zero_pos != v6stat.total))
1141 /* Can only have one zero if *not* start or end */
1143 if ((v6stat.zero_pos == 0)
1144 || (v6stat.zero_pos == v6stat.total))
1151 if (v6stat.zero_pos >= 0) {
1152 /* Copy initial part */
1153 memcpy(v6, v6stat.tmp, v6stat.zero_pos);
1155 memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
1156 /* Copy final part */
1157 if (v6stat.total != v6stat.zero_pos)
1158 memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
1159 v6stat.tmp + v6stat.zero_pos,
1160 v6stat.total - v6stat.zero_pos);
1162 memcpy(v6, v6stat.tmp, 16);
1167 static int ipv6_cb(const char *elem, int len, void *usr)
1170 /* Error if 16 bytes written */
1174 /* Zero length element, corresponds to '::' */
1175 if (s->zero_pos == -1)
1176 s->zero_pos = s->total;
1177 /* If we've already got a :: its an error */
1178 else if (s->zero_pos != s->total)
1182 /* If more than 4 characters could be final a.b.c.d form */
1184 /* Need at least 4 bytes left */
1187 /* Must be end of string */
1190 if (!ipv4_from_asc(s->tmp + s->total, elem))
1194 if (!ipv6_hex(s->tmp + s->total, elem, len))
1203 * Convert a string of up to 4 hex digits into the corresponding IPv6 form.
1206 static int ipv6_hex(unsigned char *out, const char *in, int inlen)
1209 unsigned int num = 0;
1217 x = OPENSSL_hexchar2int(c);
1223 out[1] = num & 0xff;
1227 int X509V3_NAME_from_section(X509_NAME *nm, STACK_OF(CONF_VALUE) *dn_sk,
1228 unsigned long chtype)
1231 int i, mval, spec_char, plus_char;
1236 for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++) {
1237 v = sk_CONF_VALUE_value(dn_sk, i);
1240 * Skip past any leading X. X: X, etc to allow for multiple instances
1242 for (p = type; *p; p++) {
1243 #ifndef CHARSET_EBCDIC
1244 spec_char = ((*p == ':') || (*p == ',') || (*p == '.'));
1246 spec_char = ((*p == os_toascii[':']) || (*p == os_toascii[','])
1247 || (*p == os_toascii['.']));
1256 #ifndef CHARSET_EBCDIC
1257 plus_char = (*type == '+');
1259 plus_char = (*type == os_toascii['+']);
1266 if (!X509_NAME_add_entry_by_txt(nm, type, chtype,
1267 (unsigned char *)v->value, -1, -1,