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openssl/crypto/x509/v3_utl.c
Matt Caswell e6623cfbff Fix safestack issues in x509.h 
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12781)
2020-09-13 11:09:45 +01:00

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/*
* Copyright 1999-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/* X509 v3 extension utilities */
#include "e_os.h"
#include "internal/cryptlib.h"
#include <stdio.h>
#include "crypto/ctype.h"
#include <openssl/conf.h>
#include <openssl/crypto.h>
#include <openssl/x509v3.h>
#include "crypto/x509.h"
#include <openssl/bn.h>
#include "ext_dat.h"
#include "x509_local.h"
DEFINE_STACK_OF(CONF_VALUE)
DEFINE_STACK_OF(GENERAL_NAME)
DEFINE_STACK_OF(ACCESS_DESCRIPTION)
DEFINE_STACK_OF_STRING()
static char *strip_spaces(char *name);
static int sk_strcmp(const char *const *a, const char *const *b);
static STACK_OF(OPENSSL_STRING) *get_email(const X509_NAME *name,
GENERAL_NAMES *gens);
static void str_free(OPENSSL_STRING str);
static int append_ia5(STACK_OF(OPENSSL_STRING) **sk,
const 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;
int sk_allocated = (*extlist == NULL);
if (name && (tname = OPENSSL_strdup(name)) == NULL)
goto err;
if (value && (tvalue = OPENSSL_strdup(value)) == NULL)
goto err;
if ((vtmp = OPENSSL_malloc(sizeof(*vtmp))) == NULL)
goto err;
if (sk_allocated && (*extlist = sk_CONF_VALUE_new_null()) == NULL)
goto err;
vtmp->section = NULL;
vtmp->name = tname;
vtmp->value = tvalue;
if (!sk_CONF_VALUE_push(*extlist, vtmp))
goto err;
return 1;
err:
X509V3err(X509V3_F_X509V3_ADD_VALUE, ERR_R_MALLOC_FAILURE);
if (sk_allocated) {
sk_CONF_VALUE_free(*extlist);
*extlist = NULL;
}
OPENSSL_free(vtmp);
OPENSSL_free(tname);
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;
OPENSSL_free(conf->name);
OPENSSL_free(conf->value);
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(const char *name, int asn1_bool,
STACK_OF(CONF_VALUE) **extlist)
{
if (asn1_bool)
return X509V3_add_value(name, "TRUE", extlist);
return 1;
}
static char *bignum_to_string(const BIGNUM *bn)
{
char *tmp, *ret;
size_t len;
/*
* Display large numbers in hex and small numbers in decimal. Converting to
* decimal takes quadratic time and is no more useful than hex for large
* numbers.
*/
if (BN_num_bits(bn) < 128)
return BN_bn2dec(bn);
tmp = BN_bn2hex(bn);
if (tmp == NULL)
return NULL;
len = strlen(tmp) + 3;
ret = OPENSSL_malloc(len);
if (ret == NULL) {
X509V3err(X509V3_F_BIGNUM_TO_STRING, ERR_R_MALLOC_FAILURE);
OPENSSL_free(tmp);
return NULL;
}
/* Prepend "0x", but place it after the "-" if negative. */
if (tmp[0] == '-') {
OPENSSL_strlcpy(ret, "-0x", len);
OPENSSL_strlcat(ret, tmp + 1, len);
} else {
OPENSSL_strlcpy(ret, "0x", len);
OPENSSL_strlcat(ret, tmp, len);
}
OPENSSL_free(tmp);
return ret;
}
char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, const ASN1_ENUMERATED *a)
{
BIGNUM *bntmp = NULL;
char *strtmp = NULL;
if (!a)
return NULL;
if ((bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) == NULL
|| (strtmp = bignum_to_string(bntmp)) == NULL)
X509V3err(X509V3_F_I2S_ASN1_ENUMERATED, ERR_R_MALLOC_FAILURE);
BN_free(bntmp);
return strtmp;
}
char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, const ASN1_INTEGER *a)
{
BIGNUM *bntmp = NULL;
char *strtmp = NULL;
if (!a)
return NULL;
if ((bntmp = ASN1_INTEGER_to_BN(a, NULL)) == NULL
|| (strtmp = bignum_to_string(bntmp)) == NULL)
X509V3err(X509V3_F_I2S_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
BN_free(bntmp);
return strtmp;
}
ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, const char *value)
{
BIGNUM *bn = NULL;
ASN1_INTEGER *aint;
int isneg, ishex;
int ret;
if (value == NULL) {
X509V3err(X509V3_F_S2I_ASN1_INTEGER, X509V3_R_INVALID_NULL_VALUE);
return NULL;
}
bn = BN_new();
if (bn == NULL) {
X509V3err(X509V3_F_S2I_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
return NULL;
}
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);
X509V3err(X509V3_F_S2I_ASN1_INTEGER, X509V3_R_BN_DEC2BN_ERROR);
return NULL;
}
if (isneg && BN_is_zero(bn))
isneg = 0;
aint = BN_to_ASN1_INTEGER(bn, NULL);
BN_free(bn);
if (!aint) {
X509V3err(X509V3_F_S2I_ASN1_INTEGER,
X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
return NULL;
}
if (isneg)
aint->type |= V_ASN1_NEG;
return aint;
}
int X509V3_add_value_int(const char *name, const ASN1_INTEGER *aint,
STACK_OF(CONF_VALUE) **extlist)
{
char *strtmp;
int ret;
if (!aint)
return 1;
if ((strtmp = i2s_ASN1_INTEGER(NULL, aint)) == NULL)
return 0;
ret = X509V3_add_value(name, strtmp, extlist);
OPENSSL_free(strtmp);
return ret;
}
int X509V3_get_value_bool(const CONF_VALUE *value, int *asn1_bool)
{
const char *btmp;
if ((btmp = value->value) == NULL)
goto err;
if (strcmp(btmp, "TRUE") == 0
|| strcmp(btmp, "true") == 0
|| strcmp(btmp, "Y") == 0
|| strcmp(btmp, "y") == 0
|| strcmp(btmp, "YES") == 0
|| strcmp(btmp, "yes") == 0) {
*asn1_bool = 0xff;
return 1;
}
if (strcmp(btmp, "FALSE") == 0
|| strcmp(btmp, "false") == 0
|| strcmp(btmp, "N") == 0
|| strcmp(btmp, "n") == 0
|| strcmp(btmp, "NO") == 0
|| strcmp(btmp, "no") == 0) {
*asn1_bool = 0;
return 1;
}
err:
X509V3err(X509V3_F_X509V3_GET_VALUE_BOOL,
X509V3_R_INVALID_BOOLEAN_STRING);
X509V3_conf_add_error_name_value(value);
return 0;
}
int X509V3_get_value_int(const CONF_VALUE *value, ASN1_INTEGER **aint)
{
ASN1_INTEGER *itmp;
if ((itmp = s2i_ASN1_INTEGER(NULL, value->value)) == NULL) {
X509V3_conf_add_error_name_value(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 = OPENSSL_strdup(line);
if (linebuf == NULL) {
X509V3err(X509V3_F_X509V3_PARSE_LIST, 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) {
X509V3err(X509V3_F_X509V3_PARSE_LIST,
X509V3_R_INVALID_EMPTY_NAME);
goto err;
}
q = p + 1;
} else if (c == ',') {
*p = 0;
ntmp = strip_spaces(q);
q = p + 1;
if (!ntmp) {
X509V3err(X509V3_F_X509V3_PARSE_LIST,
X509V3_R_INVALID_EMPTY_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 (!vtmp) {
X509V3err(X509V3_F_X509V3_PARSE_LIST,
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 (!vtmp) {
X509V3err(X509V3_F_X509V3_PARSE_LIST,
X509V3_R_INVALID_NULL_VALUE);
goto err;
}
X509V3_add_value(ntmp, vtmp, &values);
} else {
ntmp = strip_spaces(q);
if (!ntmp) {
X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_EMPTY_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 && ossl_isspace(*p))
p++;
if (*p == '\0')
return NULL;
q = p + strlen(p) - 1;
while ((q != p) && ossl_isspace(*q))
q--;
if (p != q)
q[1] = 0;
if (*p == '\0')
return NULL;
return p;
}
/*
* V2I name comparison function: returns zero if 'name' matches cmp or cmp.*
*/
int v3_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 char *const *a, const char *const *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;
int 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(const X509_NAME *name,
GENERAL_NAMES *gens)
{
STACK_OF(OPENSSL_STRING) *ret = NULL;
X509_NAME_ENTRY *ne;
const ASN1_IA5STRING *email;
GENERAL_NAME *gen;
int i = -1;
/* Now add any email address(es) to STACK */
/* 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 (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
gen = sk_GENERAL_NAME_value(gens, i);
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,
const 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 == NULL)
*sk = sk_OPENSSL_STRING_new(sk_strcmp);
if (*sk == NULL)
return 0;
/* Don't add duplicates */
if (sk_OPENSSL_STRING_find(*sk, (char *)email->data) != -1)
return 1;
emtmp = OPENSSL_strdup((char *)email->data);
if (emtmp == NULL || !sk_OPENSSL_STRING_push(*sk, emtmp)) {
OPENSSL_free(emtmp); /* free on push failure */
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,
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_len, flags);
if (pattern_len != subject_len)
return 0;
while (pattern_len != 0) {
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_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 && 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 (('a' <= p[i] && p[i] <= 'z')
|| ('A' <= p[i] && p[i] <= 'Z')
|| ('0' <= p[i] && p[i] <= '9')) {
if ((state & LABEL_START) != 0
&& len - i >= 4 && strncasecmp((char *)&p[i], "xn--", 4) == 0)
state |= LABEL_IDNA;
state &= ~(LABEL_HYPHEN | LABEL_START);
} else if (p[i] == '.') {
if ((state & (LABEL_HYPHEN | LABEL_START)) != 0)
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(const 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 = OPENSSL_strndup((char *)a->data, a->length);
} else {
int astrlen;
unsigned char *astr;
astrlen = ASN1_STRING_to_UTF8(&astr, a);
if (astrlen < 0) {
/*
* -1 could be an internal malloc failure or a decoding error from
* malformed input; we can't distinguish.
*/
return -1;
}
rv = equal(astr, astrlen, (unsigned char *)b, blen, flags);
if (rv > 0 && peername)
*peername = OPENSSL_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;
const X509_NAME *name = NULL;
int i;
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;
}
if (chklen == 0)
chklen = strlen(chk);
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 == GEN_OTHERNAME) && (check_type == GEN_EMAIL)) {
if (OBJ_obj2nid(gen->d.otherName->type_id) ==
NID_id_on_SmtpUTF8Mailbox) {
san_present = 1;
cstr = gen->d.otherName->value->value.utf8string;
/* Positive on success, negative on error! */
if ((rv = do_check_string(cstr, 0, equal, flags,
chk, chklen, peername)) != 0)
break;
} else
continue;
} else {
if ((gen->type != check_type) && (gen->type != GEN_OTHERNAME))
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 (san_present && !(flags & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT))
return 0;
}
/* We're done if CN-ID is not pertinent */
if (cnid == NID_undef || (flags & X509_CHECK_FLAG_NEVER_CHECK_SUBJECT))
return 0;
i = -1;
name = X509_get_subject_name(x);
while ((i = X509_NAME_get_index_by_NID(name, cnid, i)) >= 0) {
const X509_NAME_ENTRY *ne = X509_NAME_get_entry(name, i);
const ASN1_STRING *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;
/*
* Embedded NULs are disallowed, except as the last character of a
* string of length 2 or more (tolerate caller including terminating
* NUL in string length).
*/
if (chklen == 0)
chklen = strlen(chk);
else if (memchr(chk, '\0', chklen > 1 ? chklen - 1 : chklen))
return -2;
if (chklen > 1 && chk[chklen - 1] == '\0')
--chklen;
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;
/*
* Embedded NULs are disallowed, except as the last character of a
* string of length 2 or more (tolerate caller including terminating
* NUL in string length).
*/
if (chklen == 0)
chklen = strlen((char *)chk);
else if (memchr(chk, '\0', chklen > 1 ? chklen - 1 : chklen))
return -2;
if (chklen > 1 && chk[chklen - 1] == '\0')
--chklen;
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);
}
char *ipaddr_to_asc(unsigned char *p, int len)
{
/*
* 40 is enough space for the longest IPv6 address + nul terminator byte
* XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX\0
*/
char buf[40], *out;
int i = 0, remain = 0, bytes = 0;
switch (len) {
case 4: /* IPv4 */
BIO_snprintf(buf, sizeof(buf), "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
break;
/* TODO possibly combine with static i2r_address() in v3_addr.c */
case 16: /* IPv6 */
for (out = buf, i = 8, remain = sizeof(buf);
i-- > 0 && bytes >= 0;
remain -= bytes, out += bytes) {
const char *template = (i > 0 ? "%X:" : "%X");
bytes = BIO_snprintf(out, remain, template, p[0] << 8 | p[1]);
p += 2;
}
break;
default:
BIO_snprintf(buf, sizeof(buf), "<invalid length=%d>", len);
break;
}
return OPENSSL_strdup(buf);
}
/*
* 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 == NULL)
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 == NULL)
return NULL;
iptmp = OPENSSL_strdup(ipasc);
if (iptmp == NULL)
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 == NULL)
goto err;
if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
goto err;
return ret;
err:
OPENSSL_free(iptmp);
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;
} else if (v6stat.zero_cnt == 2) {
/* Can only have two zeroes if at start or end */
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;
int x;
if (inlen > 4)
return 0;
while (inlen--) {
c = *in++;
num <<= 4;
x = OPENSSL_hexchar2int(c);
if (x < 0)
return 0;
num |= (char)x;
}
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 i, mval, spec_char, plus_char;
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++) {
#ifndef CHARSET_EBCDIC
spec_char = ((*p == ':') || (*p == ',') || (*p == '.'));
#else
spec_char = ((*p == os_toascii[':']) || (*p == os_toascii[','])
|| (*p == os_toascii['.']));
#endif
if (spec_char) {
p++;
if (*p)
type = p;
break;
}
}
#ifndef CHARSET_EBCDIC
plus_char = (*type == '+');
#else
plus_char = (*type == os_toascii['+']);
#endif
if (plus_char) {
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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