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boringssl/crypto/x509v3/v3_utl.c
Steven Valdez e412bbd9a1 Fix wildcard match on punycode/IDNA DNS names 
- bugfix: should not treat '--' as invalid domain substring.
- '-' should not be the first letter of a domain

(Imported from upstream's 15debc128ac13420a4eec9b4a66d72f1dfd69126)

Change-Id: Ifd8ff7cef1aab69da5cade8ff8c76c3a723f3838
Reviewed-on: https://boringssl-review.googlesource.com/7205
Reviewed-by: David Benjamin <davidben@google.com>
2016-02-23 23:31:18 +00:00

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/* v3_utl.c */
/*
* Written by Dr Stephen N Henson (steve@openssl.org) 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
* licensing@OpenSSL.org.
*
* 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
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/* X509 v3 extension utilities */
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <openssl/bn.h>
#include <openssl/buf.h>
#include <openssl/conf.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
#include <openssl/x509v3.h>
#include "../conf/internal.h"
static char *strip_spaces(char *name);
static int sk_strcmp(const OPENSSL_STRING *a, const OPENSSL_STRING *b);
static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
GENERAL_NAMES *gens);
static void str_free(OPENSSL_STRING str);
static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email);
static int ipv4_from_asc(unsigned char *v4, const char *in);
static int ipv6_from_asc(unsigned char *v6, const char *in);
static int ipv6_cb(const char *elem, int len, void *usr);
static int ipv6_hex(unsigned char *out, const char *in, int inlen);
/* Add a CONF_VALUE name value pair to stack */
int X509V3_add_value(const char *name, const char *value,
STACK_OF(CONF_VALUE) **extlist)
{
CONF_VALUE *vtmp = NULL;
char *tname = NULL, *tvalue = NULL;
if (name && !(tname = BUF_strdup(name)))
goto err;
if (value && !(tvalue = BUF_strdup(value)))
goto err;
if (!(vtmp = CONF_VALUE_new()))
goto err;
if (!*extlist && !(*extlist = sk_CONF_VALUE_new_null()))
goto err;
vtmp->section = NULL;
vtmp->name = tname;
vtmp->value = tvalue;
if (!sk_CONF_VALUE_push(*extlist, vtmp))
goto err;
return 1;
err:
OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
if (vtmp)
OPENSSL_free(vtmp);
if (tname)
OPENSSL_free(tname);
if (tvalue)
OPENSSL_free(tvalue);
return 0;
}
int X509V3_add_value_uchar(const char *name, const unsigned char *value,
STACK_OF(CONF_VALUE) **extlist)
{
return X509V3_add_value(name, (const char *)value, extlist);
}
/* Free function for STACK_OF(CONF_VALUE) */
void X509V3_conf_free(CONF_VALUE *conf)
{
if (!conf)
return;
if (conf->name)
OPENSSL_free(conf->name);
if (conf->value)
OPENSSL_free(conf->value);
if (conf->section)
OPENSSL_free(conf->section);
OPENSSL_free(conf);
}
int X509V3_add_value_bool(const char *name, int asn1_bool,
STACK_OF(CONF_VALUE) **extlist)
{
if (asn1_bool)
return X509V3_add_value(name, "TRUE", extlist);
return X509V3_add_value(name, "FALSE", extlist);
}
int X509V3_add_value_bool_nf(char *name, int asn1_bool,
STACK_OF(CONF_VALUE) **extlist)
{
if (asn1_bool)
return X509V3_add_value(name, "TRUE", extlist);
return 1;
}
char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, ASN1_ENUMERATED *a)
{
BIGNUM *bntmp = NULL;
char *strtmp = NULL;
if (!a)
return NULL;
if (!(bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) ||
!(strtmp = BN_bn2dec(bntmp)))
OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
BN_free(bntmp);
return strtmp;
}
char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, ASN1_INTEGER *a)
{
BIGNUM *bntmp = NULL;
char *strtmp = NULL;
if (!a)
return NULL;
if (!(bntmp = ASN1_INTEGER_to_BN(a, NULL)) ||
!(strtmp = BN_bn2dec(bntmp)))
OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
BN_free(bntmp);
return strtmp;
}
ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, char *value)
{
BIGNUM *bn = NULL;
ASN1_INTEGER *aint;
int isneg, ishex;
int ret;
if (!value) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NULL_VALUE);
return 0;
}
bn = BN_new();
if (value[0] == '-') {
value++;
isneg = 1;
} else
isneg = 0;
if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) {
value += 2;
ishex = 1;
} else
ishex = 0;
if (ishex)
ret = BN_hex2bn(&bn, value);
else
ret = BN_dec2bn(&bn, value);
if (!ret || value[ret]) {
BN_free(bn);
OPENSSL_PUT_ERROR(X509V3, X509V3_R_BN_DEC2BN_ERROR);
return 0;
}
if (isneg && BN_is_zero(bn))
isneg = 0;
aint = BN_to_ASN1_INTEGER(bn, NULL);
BN_free(bn);
if (!aint) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
return 0;
}
if (isneg)
aint->type |= V_ASN1_NEG;
return aint;
}
int X509V3_add_value_int(const char *name, ASN1_INTEGER *aint,
STACK_OF(CONF_VALUE) **extlist)
{
char *strtmp;
int ret;
if (!aint)
return 1;
if (!(strtmp = i2s_ASN1_INTEGER(NULL, aint)))
return 0;
ret = X509V3_add_value(name, strtmp, extlist);
OPENSSL_free(strtmp);
return ret;
}
int X509V3_get_value_bool(CONF_VALUE *value, int *asn1_bool)
{
char *btmp;
if (!(btmp = value->value))
goto err;
if (!strcmp(btmp, "TRUE") || !strcmp(btmp, "true")
|| !strcmp(btmp, "Y") || !strcmp(btmp, "y")
|| !strcmp(btmp, "YES") || !strcmp(btmp, "yes")) {
*asn1_bool = 0xff;
return 1;
} else if (!strcmp(btmp, "FALSE") || !strcmp(btmp, "false")
|| !strcmp(btmp, "N") || !strcmp(btmp, "n")
|| !strcmp(btmp, "NO") || !strcmp(btmp, "no")) {
*asn1_bool = 0;
return 1;
}
err:
OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_BOOLEAN_STRING);
X509V3_conf_err(value);
return 0;
}
int X509V3_get_value_int(CONF_VALUE *value, ASN1_INTEGER **aint)
{
ASN1_INTEGER *itmp;
if (!(itmp = s2i_ASN1_INTEGER(NULL, value->value))) {
X509V3_conf_err(value);
return 0;
}
*aint = itmp;
return 1;
}
#define HDR_NAME 1
#define HDR_VALUE 2
/*
* #define DEBUG
*/
STACK_OF(CONF_VALUE) *X509V3_parse_list(const char *line)
{
char *p, *q, c;
char *ntmp, *vtmp;
STACK_OF(CONF_VALUE) *values = NULL;
char *linebuf;
int state;
/* We are going to modify the line so copy it first */
linebuf = BUF_strdup(line);
if (linebuf == NULL) {
OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
goto err;
}
state = HDR_NAME;
ntmp = NULL;
/* Go through all characters */
for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
p++) {
switch (state) {
case HDR_NAME:
if (c == ':') {
state = HDR_VALUE;
*p = 0;
ntmp = strip_spaces(q);
if (!ntmp) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NULL_NAME);
goto err;
}
q = p + 1;
} else if (c == ',') {
*p = 0;
ntmp = strip_spaces(q);
q = p + 1;
#if 0
printf("%s\n", ntmp);
#endif
if (!ntmp) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NULL_NAME);
goto err;
}
X509V3_add_value(ntmp, NULL, &values);
}
break;
case HDR_VALUE:
if (c == ',') {
state = HDR_NAME;
*p = 0;
vtmp = strip_spaces(q);
#if 0
printf("%s\n", ntmp);
#endif
if (!vtmp) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NULL_VALUE);
goto err;
}
X509V3_add_value(ntmp, vtmp, &values);
ntmp = NULL;
q = p + 1;
}
}
}
if (state == HDR_VALUE) {
vtmp = strip_spaces(q);
#if 0
printf("%s=%s\n", ntmp, vtmp);
#endif
if (!vtmp) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NULL_VALUE);
goto err;
}
X509V3_add_value(ntmp, vtmp, &values);
} else {
ntmp = strip_spaces(q);
#if 0
printf("%s\n", ntmp);
#endif
if (!ntmp) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NULL_NAME);
goto err;
}
X509V3_add_value(ntmp, NULL, &values);
}
OPENSSL_free(linebuf);
return values;
err:
OPENSSL_free(linebuf);
sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
return NULL;
}
/* Delete leading and trailing spaces from a string */
static char *strip_spaces(char *name)
{
char *p, *q;
/* Skip over leading spaces */
p = name;
while (*p && isspace((unsigned char)*p))
p++;
if (!*p)
return NULL;
q = p + strlen(p) - 1;
while ((q != p) && isspace((unsigned char)*q))
q--;
if (p != q)
q[1] = 0;
if (!*p)
return NULL;
return p;
}
/* hex string utilities */
/*
* Given a buffer of length 'len' return a OPENSSL_malloc'ed string with its
* hex representation @@@ (Contents of buffer are always kept in ASCII, also
* on EBCDIC machines)
*/
char *hex_to_string(const unsigned char *buffer, long len)
{
char *tmp, *q;
const unsigned char *p;
int i;
static const char hexdig[] = "0123456789ABCDEF";
if (!buffer || !len)
return NULL;
if (!(tmp = OPENSSL_malloc(len * 3 + 1))) {
OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
return NULL;
}
q = tmp;
for (i = 0, p = buffer; i < len; i++, p++) {
*q++ = hexdig[(*p >> 4) & 0xf];
*q++ = hexdig[*p & 0xf];
*q++ = ':';
}
q[-1] = 0;
return tmp;
}
/*
* Give a string of hex digits convert to a buffer
*/
unsigned char *string_to_hex(const char *str, long *len)
{
unsigned char *hexbuf, *q;
unsigned char ch, cl, *p;
if (!str) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NULL_ARGUMENT);
return NULL;
}
if (!(hexbuf = OPENSSL_malloc(strlen(str) >> 1)))
goto err;
for (p = (unsigned char *)str, q = hexbuf; *p;) {
ch = *p++;
if (ch == ':')
continue;
cl = *p++;
if (!cl) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_ODD_NUMBER_OF_DIGITS);
OPENSSL_free(hexbuf);
return NULL;
}
if (isupper(ch))
ch = tolower(ch);
if (isupper(cl))
cl = tolower(cl);
if ((ch >= '0') && (ch <= '9'))
ch -= '0';
else if ((ch >= 'a') && (ch <= 'f'))
ch -= 'a' - 10;
else
goto badhex;
if ((cl >= '0') && (cl <= '9'))
cl -= '0';
else if ((cl >= 'a') && (cl <= 'f'))
cl -= 'a' - 10;
else
goto badhex;
*q++ = (ch << 4) | cl;
}
if (len)
*len = q - hexbuf;
return hexbuf;
err:
if (hexbuf)
OPENSSL_free(hexbuf);
OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
return NULL;
badhex:
OPENSSL_free(hexbuf);
OPENSSL_PUT_ERROR(X509V3, X509V3_R_ILLEGAL_HEX_DIGIT);
return NULL;
}
/*
* V2I name comparison function: returns zero if 'name' matches cmp or cmp.*
*/
int name_cmp(const char *name, const char *cmp)
{
int len, ret;
char c;
len = strlen(cmp);
if ((ret = strncmp(name, cmp, len)))
return ret;
c = name[len];
if (!c || (c == '.'))
return 0;
return 1;
}
static int sk_strcmp(const OPENSSL_STRING *a, const OPENSSL_STRING *b)
{
return strcmp(*a, *b);
}
STACK_OF(OPENSSL_STRING) *X509_get1_email(X509 *x)
{
GENERAL_NAMES *gens;
STACK_OF(OPENSSL_STRING) *ret;
gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
ret = get_email(X509_get_subject_name(x), gens);
sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
return ret;
}
STACK_OF(OPENSSL_STRING) *X509_get1_ocsp(X509 *x)
{
AUTHORITY_INFO_ACCESS *info;
STACK_OF(OPENSSL_STRING) *ret = NULL;
size_t i;
info = X509_get_ext_d2i(x, NID_info_access, NULL, NULL);
if (!info)
return NULL;
for (i = 0; i < sk_ACCESS_DESCRIPTION_num(info); i++) {
ACCESS_DESCRIPTION *ad = sk_ACCESS_DESCRIPTION_value(info, i);
if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
if (ad->location->type == GEN_URI) {
if (!append_ia5
(&ret, ad->location->d.uniformResourceIdentifier))
break;
}
}
}
AUTHORITY_INFO_ACCESS_free(info);
return ret;
}
STACK_OF(OPENSSL_STRING) *X509_REQ_get1_email(X509_REQ *x)
{
GENERAL_NAMES *gens;
STACK_OF(X509_EXTENSION) *exts;
STACK_OF(OPENSSL_STRING) *ret;
exts = X509_REQ_get_extensions(x);
gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);
ret = get_email(X509_REQ_get_subject_name(x), gens);
sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
return ret;
}
static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
GENERAL_NAMES *gens)
{
STACK_OF(OPENSSL_STRING) *ret = NULL;
X509_NAME_ENTRY *ne;
ASN1_IA5STRING *email;
GENERAL_NAME *gen;
int i;
size_t j;
/* Now add any email address(es) to STACK */
i = -1;
/* First supplied X509_NAME */
while ((i = X509_NAME_get_index_by_NID(name,
NID_pkcs9_emailAddress, i)) >= 0) {
ne = X509_NAME_get_entry(name, i);
email = X509_NAME_ENTRY_get_data(ne);
if (!append_ia5(&ret, email))
return NULL;
}
for (j = 0; j < sk_GENERAL_NAME_num(gens); j++) {
gen = sk_GENERAL_NAME_value(gens, j);
if (gen->type != GEN_EMAIL)
continue;
if (!append_ia5(&ret, gen->d.ia5))
return NULL;
}
return ret;
}
static void str_free(OPENSSL_STRING str)
{
OPENSSL_free(str);
}
static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email)
{
char *emtmp;
/* First some sanity checks */
if (email->type != V_ASN1_IA5STRING)
return 1;
if (!email->data || !email->length)
return 1;
if (!*sk)
*sk = sk_OPENSSL_STRING_new(sk_strcmp);
if (!*sk)
return 0;
/* Don't add duplicates */
if (sk_OPENSSL_STRING_find(*sk, NULL, (char *)email->data))
return 1;
emtmp = BUF_strdup((char *)email->data);
if (!emtmp || !sk_OPENSSL_STRING_push(*sk, emtmp)) {
X509_email_free(*sk);
*sk = NULL;
return 0;
}
return 1;
}
void X509_email_free(STACK_OF(OPENSSL_STRING) *sk)
{
sk_OPENSSL_STRING_pop_free(sk, str_free);
}
typedef int (*equal_fn) (const unsigned char *pattern, size_t pattern_len,
const unsigned char *subject, size_t subject_len,
unsigned int flags);
/* Skip pattern prefix to match "wildcard" subject */
static void skip_prefix(const unsigned char **p, size_t *plen,
const unsigned char *subject, size_t subject_len,
unsigned int flags)
{
const unsigned char *pattern = *p;
size_t pattern_len = *plen;
/*
* If subject starts with a leading '.' followed by more octets, and
* pattern is longer, compare just an equal-length suffix with the
* full subject (starting at the '.'), provided the prefix contains
* no NULs.
*/
if ((flags & _X509_CHECK_FLAG_DOT_SUBDOMAINS) == 0)
return;
while (pattern_len > subject_len && *pattern) {
if ((flags & X509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS) &&
*pattern == '.')
break;
++pattern;
--pattern_len;
}
/* Skip if entire prefix acceptable */
if (pattern_len == subject_len) {
*p = pattern;
*plen = pattern_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,
unsigned int flags)
{
skip_prefix(&pattern, &pattern_len, subject, subject_len, flags);
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,
unsigned int flags)
{
skip_prefix(&pattern, &pattern_len, subject, subject_len, flags);
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,
unsigned int unused_flags)
{
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, 0))
return 0;
break;
}
}
if (i == 0)
i = a_len;
return equal_case(a, i, b, i, 0);
}
/*
* 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,
unsigned int flags)
{
const unsigned char *wildcard_start;
const unsigned char *wildcard_end;
const unsigned char *p;
int allow_multi = 0;
int allow_idna = 0;
if (subject_len < prefix_len + suffix_len)
return 0;
if (!equal_nocase(prefix, prefix_len, subject, prefix_len, flags))
return 0;
wildcard_start = subject + prefix_len;
wildcard_end = subject + (subject_len - suffix_len);
if (!equal_nocase(wildcard_end, suffix_len, suffix, suffix_len, flags))
return 0;
/*
* If the wildcard makes up the entire first label, it must match at
* least one character.
*/
if (prefix_len == 0 && *suffix == '.') {
if (wildcard_start == wildcard_end)
return 0;
allow_idna = 1;
if (flags & X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS)
allow_multi = 1;
}
/* IDNA labels cannot match partial wildcards */
if (!allow_idna &&
subject_len >= 4
&& OPENSSL_strncasecmp((char *)subject, "xn--", 4) == 0)
return 0;
/* The wildcard may match a literal '*' */
if (wildcard_end == wildcard_start + 1 && *wildcard_start == '*')
return 1;
/*
* Check that the part matched by the wildcard contains only
* permitted characters and only matches a single label unless
* allow_multi is set.
*/
for (p = wildcard_start; p != wildcard_end; ++p)
if (!(('0' <= *p && *p <= '9') ||
('A' <= *p && *p <= 'Z') ||
('a' <= *p && *p <= 'z') ||
*p == '-' || (allow_multi && *p == '.')))
return 0;
return 1;
}
#define LABEL_START (1 << 0)
#define LABEL_END (1 << 1)
#define LABEL_HYPHEN (1 << 2)
#define LABEL_IDNA (1 << 3)
static const unsigned char *valid_star(const unsigned char *p, size_t len,
unsigned int flags)
{
const unsigned char *star = 0;
size_t i;
int state = LABEL_START;
int dots = 0;
for (i = 0; i < len; ++i) {
/*
* Locate first and only legal wildcard, either at the start
* or end of a non-IDNA first and not final label.
*/
if (p[i] == '*') {
int atstart = (state & LABEL_START);
int atend = (i == len - 1 || p[i + 1] == '.');
/*
* At most one wildcard per pattern.
* No wildcards in IDNA labels.
* No wildcards after the first label.
*/
if (star != NULL || (state & LABEL_IDNA) != 0 || dots)
return NULL;
/* Only full-label '*.example.com' wildcards? */
if ((flags & X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS)
&& (!atstart || !atend))
return NULL;
/* No 'foo*bar' wildcards */
if (!atstart && !atend)
return NULL;
star = &p[i];
state &= ~LABEL_START;
} else if ((state & LABEL_START) != 0) {
/*
* At the start of a label, skip any "xn--" and
* remain in the LABEL_START state, but set the
* IDNA label state
*/
if ((state & LABEL_IDNA) == 0 && len - i >= 4
&& OPENSSL_strncasecmp((char *)&p[i], "xn--", 4) == 0) {
i += 3;
state |= LABEL_IDNA;
continue;
}
/* Labels must start with a letter or digit */
state &= ~LABEL_START;
if (('a' <= p[i] && p[i] <= 'z')
|| ('A' <= p[i] && p[i] <= 'Z')
|| ('0' <= p[i] && p[i] <= '9'))
continue;
return NULL;
} else if (('a' <= p[i] && p[i] <= 'z')
|| ('A' <= p[i] && p[i] <= 'Z')
|| ('0' <= p[i] && p[i] <= '9')) {
state &= LABEL_IDNA;
continue;
} else if (p[i] == '.') {
if (state & (LABEL_HYPHEN | LABEL_START))
return NULL;
state = LABEL_START;
++dots;
} else if (p[i] == '-') {
/* no domain/subdomain starts with '-' */
if ((state & LABEL_START) != 0)
return NULL;
state |= LABEL_HYPHEN;
} else
return NULL;
}
/*
* The final label must not end in a hyphen or ".", and
* there must be at least two dots after the star.
*/
if ((state & (LABEL_START | LABEL_HYPHEN)) != 0 || dots < 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,
unsigned int flags)
{
const unsigned char *star = NULL;
/*
* Subject names starting with '.' can only match a wildcard pattern
* via a subject sub-domain pattern suffix match.
*/
if (!(subject_len > 1 && subject[0] == '.'))
star = valid_star(pattern, pattern_len, flags);
if (star == NULL)
return equal_nocase(pattern, pattern_len,
subject, subject_len, flags);
return wildcard_match(pattern, star - pattern,
star + 1, (pattern + pattern_len) - star - 1,
subject, subject_len, flags);
}
/*
* 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,
unsigned int flags, const char *b, size_t blen,
char **peername)
{
int rv = 0;
if (!a->data || !a->length)
return 0;
if (cmp_type > 0) {
if (cmp_type != a->type)
return 0;
if (cmp_type == V_ASN1_IA5STRING)
rv = equal(a->data, a->length, (unsigned char *)b, blen, flags);
else if (a->length == (int)blen && !memcmp(a->data, b, blen))
rv = 1;
if (rv > 0 && peername)
*peername = BUF_strndup((char *)a->data, a->length);
} else {
int astrlen;
unsigned char *astr;
astrlen = ASN1_STRING_to_UTF8(&astr, a);
if (astrlen < 0)
return -1;
rv = equal(astr, astrlen, (unsigned char *)b, blen, flags);
if (rv > 0 && peername)
*peername = BUF_strndup((char *)astr, astrlen);
OPENSSL_free(astr);
}
return rv;
}
static int do_x509_check(X509 *x, const char *chk, size_t chklen,
unsigned int flags, int check_type, char **peername)
{
GENERAL_NAMES *gens = NULL;
X509_NAME *name = NULL;
size_t i;
int j;
int cnid = NID_undef;
int alt_type;
int san_present = 0;
int rv = 0;
equal_fn equal;
/* See below, this flag is internal-only */
flags &= ~_X509_CHECK_FLAG_DOT_SUBDOMAINS;
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;
/* Implicit client-side DNS sub-domain pattern */
if (chklen > 1 && chk[0] == '.')
flags |= _X509_CHECK_FLAG_DOT_SUBDOMAINS;
alt_type = V_ASN1_IA5STRING;
if (flags & X509_CHECK_FLAG_NO_WILDCARDS)
equal = equal_nocase;
else
equal = equal_wildcard;
} else {
alt_type = V_ASN1_OCTET_STRING;
equal = equal_case;
}
gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
if (gens) {
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;
san_present = 1;
if (check_type == GEN_EMAIL)
cstr = gen->d.rfc822Name;
else if (check_type == GEN_DNS)
cstr = gen->d.dNSName;
else
cstr = gen->d.iPAddress;
/* Positive on success, negative on error! */
if ((rv = do_check_string(cstr, alt_type, equal, flags,
chk, chklen, peername)) != 0)
break;
}
GENERAL_NAMES_free(gens);
if (rv != 0)
return rv;
if (cnid == NID_undef
|| (san_present
&& !(flags & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT)))
return 0;
}
/* We're done if CN-ID is not pertinent */
if (cnid == NID_undef)
return 0;
j = -1;
name = X509_get_subject_name(x);
while ((j = X509_NAME_get_index_by_NID(name, cnid, j)) >= 0) {
X509_NAME_ENTRY *ne;
ASN1_STRING *str;
ne = X509_NAME_get_entry(name, j);
str = X509_NAME_ENTRY_get_data(ne);
/* Positive on success, negative on error! */
if ((rv = do_check_string(str, -1, equal, flags,
chk, chklen, peername)) != 0)
return rv;
}
return 0;
}
int X509_check_host(X509 *x, const char *chk, size_t chklen,
unsigned int flags, char **peername)
{
if (chk == NULL)
return -2;
if (memchr(chk, '\0', chklen))
return -2;
return do_x509_check(x, chk, chklen, flags, GEN_DNS, peername);
}
int X509_check_email(X509 *x, const char *chk, size_t chklen,
unsigned int flags)
{
if (chk == NULL)
return -2;
if (memchr(chk, '\0', chklen))
return -2;
return do_x509_check(x, chk, chklen, flags, GEN_EMAIL, NULL);
}
int X509_check_ip(X509 *x, const unsigned char *chk, size_t chklen,
unsigned int flags)
{
if (chk == NULL)
return -2;
return do_x509_check(x, (char *)chk, chklen, flags, GEN_IPADD, NULL);
}
int X509_check_ip_asc(X509 *x, const char *ipasc, unsigned int flags)
{
unsigned char ipout[16];
size_t iplen;
if (ipasc == NULL)
return -2;
iplen = (size_t)a2i_ipadd(ipout, ipasc);
if (iplen == 0)
return -2;
return do_x509_check(x, (char *)ipout, iplen, flags, GEN_IPADD, NULL);
}
/*
* Convert IP addresses both IPv4 and IPv6 into an OCTET STRING compatible
* with RFC3280.
*/
ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc)
{
unsigned char ipout[16];
ASN1_OCTET_STRING *ret;
int iplen;
/* If string contains a ':' assume IPv6 */
iplen = a2i_ipadd(ipout, ipasc);
if (!iplen)
return NULL;
ret = ASN1_OCTET_STRING_new();
if (!ret)
return NULL;
if (!ASN1_OCTET_STRING_set(ret, ipout, iplen)) {
ASN1_OCTET_STRING_free(ret);
return NULL;
}
return ret;
}
ASN1_OCTET_STRING *a2i_IPADDRESS_NC(const char *ipasc)
{
ASN1_OCTET_STRING *ret = NULL;
unsigned char ipout[32];
char *iptmp = NULL, *p;
int iplen1, iplen2;
p = strchr(ipasc, '/');
if (!p)
return NULL;
iptmp = BUF_strdup(ipasc);
if (!iptmp)
return NULL;
p = iptmp + (p - ipasc);
*p++ = 0;
iplen1 = a2i_ipadd(ipout, iptmp);
if (!iplen1)
goto err;
iplen2 = a2i_ipadd(ipout + iplen1, p);
OPENSSL_free(iptmp);
iptmp = NULL;
if (!iplen2 || (iplen1 != iplen2))
goto err;
ret = ASN1_OCTET_STRING_new();
if (!ret)
goto err;
if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
goto err;
return ret;
err:
if (iptmp)
OPENSSL_free(iptmp);
if (ret)
ASN1_OCTET_STRING_free(ret);
return NULL;
}
int a2i_ipadd(unsigned char *ipout, const char *ipasc)
{
/* If string contains a ':' assume IPv6 */
if (strchr(ipasc, ':')) {
if (!ipv6_from_asc(ipout, ipasc))
return 0;
return 16;
} else {
if (!ipv4_from_asc(ipout, ipasc))
return 0;
return 4;
}
}
static int ipv4_from_asc(unsigned char *v4, const char *in)
{
int a0, a1, a2, a3;
if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4)
return 0;
if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255)
|| (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
return 0;
v4[0] = a0;
v4[1] = a1;
v4[2] = a2;
v4[3] = a3;
return 1;
}
typedef struct {
/* Temporary store for IPV6 output */
unsigned char tmp[16];
/* Total number of bytes in tmp */
int total;
/* The position of a zero (corresponding to '::') */
int zero_pos;
/* Number of zeroes */
int zero_cnt;
} IPV6_STAT;
static int ipv6_from_asc(unsigned char *v6, const char *in)
{
IPV6_STAT v6stat;
v6stat.total = 0;
v6stat.zero_pos = -1;
v6stat.zero_cnt = 0;
/*
* Treat the IPv6 representation as a list of values separated by ':'.
* The presence of a '::' will parse as one, two or three zero length
* elements.
*/
if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
return 0;
/* Now for some sanity checks */
if (v6stat.zero_pos == -1) {
/* If no '::' must have exactly 16 bytes */
if (v6stat.total != 16)
return 0;
} else {
/* If '::' must have less than 16 bytes */
if (v6stat.total == 16)
return 0;
/* More than three zeroes is an error */
if (v6stat.zero_cnt > 3)
return 0;
/* Can only have three zeroes if nothing else present */
else if (v6stat.zero_cnt == 3) {
if (v6stat.total > 0)
return 0;
}
/* Can only have two zeroes if at start or end */
else if (v6stat.zero_cnt == 2) {
if ((v6stat.zero_pos != 0)
&& (v6stat.zero_pos != v6stat.total))
return 0;
} else
/* Can only have one zero if *not* start or end */
{
if ((v6stat.zero_pos == 0)
|| (v6stat.zero_pos == v6stat.total))
return 0;
}
}
/* Format result */
if (v6stat.zero_pos >= 0) {
/* Copy initial part */
memcpy(v6, v6stat.tmp, v6stat.zero_pos);
/* Zero middle */
memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
/* Copy final part */
if (v6stat.total != v6stat.zero_pos)
memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
v6stat.tmp + v6stat.zero_pos,
v6stat.total - v6stat.zero_pos);
} else
memcpy(v6, v6stat.tmp, 16);
return 1;
}
static int ipv6_cb(const char *elem, int len, void *usr)
{
IPV6_STAT *s = usr;
/* Error if 16 bytes written */
if (s->total == 16)
return 0;
if (len == 0) {
/* Zero length element, corresponds to '::' */
if (s->zero_pos == -1)
s->zero_pos = s->total;
/* If we've already got a :: its an error */
else if (s->zero_pos != s->total)
return 0;
s->zero_cnt++;
} else {
/* If more than 4 characters could be final a.b.c.d form */
if (len > 4) {
/* Need at least 4 bytes left */
if (s->total > 12)
return 0;
/* Must be end of string */
if (elem[len])
return 0;
if (!ipv4_from_asc(s->tmp + s->total, elem))
return 0;
s->total += 4;
} else {
if (!ipv6_hex(s->tmp + s->total, elem, len))
return 0;
s->total += 2;
}
}
return 1;
}
/*
* Convert a string of up to 4 hex digits into the corresponding IPv6 form.
*/
static int ipv6_hex(unsigned char *out, const char *in, int inlen)
{
unsigned char c;
unsigned int num = 0;
if (inlen > 4)
return 0;
while (inlen--) {
c = *in++;
num <<= 4;
if ((c >= '0') && (c <= '9'))
num |= c - '0';
else if ((c >= 'A') && (c <= 'F'))
num |= c - 'A' + 10;
else if ((c >= 'a') && (c <= 'f'))
num |= c - 'a' + 10;
else
return 0;
}
out[0] = num >> 8;
out[1] = num & 0xff;
return 1;
}
int X509V3_NAME_from_section(X509_NAME *nm, STACK_OF (CONF_VALUE) * dn_sk,
unsigned long chtype)
{
CONF_VALUE *v;
int mval;
size_t i;
char *p, *type;
if (!nm)
return 0;
for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++) {
v = sk_CONF_VALUE_value(dn_sk, i);
type = v->name;
/*
* Skip past any leading X. X: X, etc to allow for multiple instances
*/
for (p = type; *p; p++)
if ((*p == ':') || (*p == ',') || (*p == '.')) {
p++;
if (*p)
type = p;
break;
}
if (*type == '+') {
mval = -1;
type++;
} else
mval = 0;
if (!X509_NAME_add_entry_by_txt(nm, type, chtype,
(unsigned char *)v->value, -1, -1,
mval))
return 0;
}
return 1;
}
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