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hostname.c
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hostname.c
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/* Go-OpenSSL notice:
This file is required for all OpenSSL versions prior to 1.1.0. This simply
provides the new 1.1.0 X509_check_* methods for hostname validation if they
don't already exist.
*/
#include <openssl/x509.h>
#ifndef X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT
/* portions from x509v3.h and v3_utl.c */
/* Written by Dr Stephen N Henson ([email protected]) for the OpenSSL
* project.
*/
/* ====================================================================
* Copyright (c) 1999-2003 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* ([email protected]). This product includes software written by Tim
* Hudson ([email protected]).
*
*/
/* X509 v3 extension utilities */
#include <stdlib.h>
#include <openssl/ssl.h>
#include <openssl/conf.h>
#include <openssl/x509v3.h>
#define X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT 0x1
#define X509_CHECK_FLAG_NO_WILDCARDS 0x2
typedef int (*equal_fn)(const unsigned char *pattern, size_t pattern_len,
const unsigned char *subject, size_t subject_len);
/* Compare while ASCII ignoring case. */
static int equal_nocase(const unsigned char *pattern, size_t pattern_len,
const unsigned char *subject, size_t subject_len)
{
if (pattern_len != subject_len)
return 0;
while (pattern_len)
{
unsigned char l = *pattern;
unsigned char r = *subject;
/* The pattern must not contain NUL characters. */
if (l == 0)
return 0;
if (l != r)
{
if ('A' <= l && l <= 'Z')
l = (l - 'A') + 'a';
if ('A' <= r && r <= 'Z')
r = (r - 'A') + 'a';
if (l != r)
return 0;
}
++pattern;
++subject;
--pattern_len;
}
return 1;
}
/* Compare using memcmp. */
static int equal_case(const unsigned char *pattern, size_t pattern_len,
const unsigned char *subject, size_t subject_len)
{
/* The pattern must not contain NUL characters. */
if (memchr(pattern, '\0', pattern_len) != NULL)
return 0;
if (pattern_len != subject_len)
return 0;
return !memcmp(pattern, subject, pattern_len);
}
/* RFC 5280, section 7.5, requires that only the domain is compared in
a case-insensitive manner. */
static int equal_email(const unsigned char *a, size_t a_len,
const unsigned char *b, size_t b_len)
{
size_t i = a_len;
if (a_len != b_len)
return 0;
/* We search backwards for the '@' character, so that we do
not have to deal with quoted local-parts. The domain part
is compared in a case-insensitive manner. */
while (i > 0)
{
--i;
if (a[i] == '@' || b[i] == '@')
{
if (!equal_nocase(a + i, a_len - i,
b + i, a_len - i))
return 0;
break;
}
}
if (i == 0)
i = a_len;
return equal_case(a, i, b, i);
}
/* Compare the prefix and suffix with the subject, and check that the
characters in-between are valid. */
static int wildcard_match(const unsigned char *prefix, size_t prefix_len,
const unsigned char *suffix, size_t suffix_len,
const unsigned char *subject, size_t subject_len)
{
const unsigned char *wildcard_start;
const unsigned char *wildcard_end;
const unsigned char *p;
if (subject_len < prefix_len + suffix_len)
return 0;
if (!equal_nocase(prefix, prefix_len, subject, prefix_len))
return 0;
wildcard_start = subject + prefix_len;
wildcard_end = subject + (subject_len - suffix_len);
if (!equal_nocase(wildcard_end, suffix_len, suffix, suffix_len))
return 0;
/* The wildcard must match at least one character. */
if (wildcard_start == wildcard_end)
return 0;
/* Check that the part matched by the wildcard contains only
permitted characters and only matches a single label. */
for (p = wildcard_start; p != wildcard_end; ++p)
if (!(('0' <= *p && *p <= '9') ||
('A' <= *p && *p <= 'Z') ||
('a' <= *p && *p <= 'z') ||
*p == '-'))
return 0;
return 1;
}
/* Checks if the memory region consistens of [0-9A-Za-z.-]. */
static int valid_domain_characters(const unsigned char *p, size_t len)
{
while (len)
{
if (!(('0' <= *p && *p <= '9') ||
('A' <= *p && *p <= 'Z') ||
('a' <= *p && *p <= 'z') ||
*p == '-' || *p == '.'))
return 0;
++p;
--len;
}
return 1;
}
/* Find the '*' in a wildcard pattern. If no such character is found
or the pattern is otherwise invalid, returns NULL. */
static const unsigned char *wildcard_find_star(const unsigned char *pattern,
size_t pattern_len)
{
const unsigned char *star = memchr(pattern, '*', pattern_len);
size_t dot_count = 0;
const unsigned char *suffix_start;
size_t suffix_length;
if (star == NULL)
return NULL;
suffix_start = star + 1;
suffix_length = (pattern + pattern_len) - (star + 1);
if (!(valid_domain_characters(pattern, star - pattern) &&
valid_domain_characters(suffix_start, suffix_length)))
return NULL;
/* Check that the suffix matches at least two labels. */
while (suffix_length)
{
if (*suffix_start == '.')
++dot_count;
++suffix_start;
--suffix_length;
}
if (dot_count < 2)
return NULL;
return star;
}
/* Compare using wildcards. */
static int equal_wildcard(const unsigned char *pattern, size_t pattern_len,
const unsigned char *subject, size_t subject_len)
{
const unsigned char *star = wildcard_find_star(pattern, pattern_len);
if (star == NULL)
return equal_nocase(pattern, pattern_len,
subject, subject_len);
return wildcard_match(pattern, star - pattern,
star + 1, (pattern + pattern_len) - star - 1,
subject, subject_len);
}
/* Compare an ASN1_STRING to a supplied string. If they match
* return 1. If cmp_type > 0 only compare if string matches the
* type, otherwise convert it to UTF8.
*/
static int do_check_string(ASN1_STRING *a, int cmp_type, equal_fn equal,
const unsigned char *b, size_t blen)
{
if (!a->data || !a->length)
return 0;
if (cmp_type > 0)
{
if (cmp_type != a->type)
return 0;
if (cmp_type == V_ASN1_IA5STRING)
return equal(a->data, a->length, b, blen);
if (a->length == (int)blen && !memcmp(a->data, b, blen))
return 1;
else
return 0;
}
else
{
int astrlen, rv;
unsigned char *astr;
astrlen = ASN1_STRING_to_UTF8(&astr, a);
if (astrlen < 0)
return -1;
rv = equal(astr, astrlen, b, blen);
OPENSSL_free(astr);
return rv;
}
}
static int do_x509_check(X509 *x, const unsigned char *chk, size_t chklen,
unsigned int flags, int check_type)
{
STACK_OF(GENERAL_NAME) *gens = NULL;
X509_NAME *name = NULL;
int i;
int cnid;
int alt_type;
equal_fn equal;
if (check_type == GEN_EMAIL)
{
cnid = NID_pkcs9_emailAddress;
alt_type = V_ASN1_IA5STRING;
equal = equal_email;
}
else if (check_type == GEN_DNS)
{
cnid = NID_commonName;
alt_type = V_ASN1_IA5STRING;
if (flags & X509_CHECK_FLAG_NO_WILDCARDS)
equal = equal_nocase;
else
equal = equal_wildcard;
}
else
{
cnid = 0;
alt_type = V_ASN1_OCTET_STRING;
equal = equal_case;
}
if (chklen == 0)
chklen = strlen((const char *)chk);
gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
if (gens)
{
int rv = 0;
for (i = 0; i < sk_GENERAL_NAME_num(gens); i++)
{
GENERAL_NAME *gen;
ASN1_STRING *cstr;
gen = sk_GENERAL_NAME_value(gens, i);
if(gen->type != check_type)
continue;
if (check_type == GEN_EMAIL)
cstr = gen->d.rfc822Name;
else if (check_type == GEN_DNS)
cstr = gen->d.dNSName;
else
cstr = gen->d.iPAddress;
if (do_check_string(cstr, alt_type, equal, chk, chklen))
{
rv = 1;
break;
}
}
GENERAL_NAMES_free(gens);
if (rv)
return 1;
if (!(flags & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT) || !cnid)
return 0;
}
i = -1;
name = X509_get_subject_name(x);
while((i = X509_NAME_get_index_by_NID(name, cnid, i)) >= 0)
{
X509_NAME_ENTRY *ne;
ASN1_STRING *str;
ne = X509_NAME_get_entry(name, i);
str = X509_NAME_ENTRY_get_data(ne);
if (do_check_string(str, -1, equal, chk, chklen))
return 1;
}
return 0;
}
#if OPENSSL_VERSION_NUMBER < 0x1000200fL
int X509_check_host(X509 *x, const unsigned char *chk, size_t chklen,
unsigned int flags)
{
return do_x509_check(x, chk, chklen, flags, GEN_DNS);
}
int X509_check_email(X509 *x, const unsigned char *chk, size_t chklen,
unsigned int flags)
{
return do_x509_check(x, chk, chklen, flags, GEN_EMAIL);
}
int X509_check_ip(X509 *x, const unsigned char *chk, size_t chklen,
unsigned int flags)
{
return do_x509_check(x, chk, chklen, flags, GEN_IPADD);
}
#endif /* OPENSSL_VERSION_NUMBER < 0x1000200fL */
#endif