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v3_utl.c
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v3_utl.c
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/*
* Copyright 1999-2024 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 "internal/e_os.h"
#include "internal/cryptlib.h"
#include <stdio.h>
#include <string.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"
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 */
static int x509v3_add_len_value(const char *name, const char *value,
size_t vallen, STACK_OF(CONF_VALUE) **extlist)
{
CONF_VALUE *vtmp = NULL;
char *tname = NULL, *tvalue = NULL;
int sk_allocated = (*extlist == NULL);
if (name != NULL && (tname = OPENSSL_strdup(name)) == NULL)
goto err;
if (value != NULL) {
/* We don't allow embedded NUL characters */
if (memchr(value, 0, vallen) != NULL)
goto err;
tvalue = OPENSSL_strndup(value, vallen);
if (tvalue == NULL)
goto err;
}
if ((vtmp = OPENSSL_malloc(sizeof(*vtmp))) == NULL)
goto err;
if (sk_allocated && (*extlist = sk_CONF_VALUE_new_null()) == NULL) {
ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
goto err;
}
vtmp->section = NULL;
vtmp->name = tname;
vtmp->value = tvalue;
if (!sk_CONF_VALUE_push(*extlist, vtmp))
goto err;
return 1;
err:
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(const char *name, const char *value,
STACK_OF(CONF_VALUE) **extlist)
{
return x509v3_add_len_value(name, value,
value != NULL ? strlen((const char *)value) : 0,
extlist);
}
int X509V3_add_value_uchar(const char *name, const unsigned char *value,
STACK_OF(CONF_VALUE) **extlist)
{
return x509v3_add_len_value(name, (const char *)value,
value != NULL ? strlen((const char *)value) : 0,
extlist);
}
int x509v3_add_len_value_uchar(const char *name, const unsigned char *value,
size_t vallen, STACK_OF(CONF_VALUE) **extlist)
{
return x509v3_add_len_value(name, (const char *)value, vallen, 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) {
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)
ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
else if ((strtmp = bignum_to_string(bntmp)) == NULL)
ERR_raise(ERR_LIB_X509V3, ERR_R_X509V3_LIB);
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)
ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
else if ((strtmp = bignum_to_string(bntmp)) == NULL)
ERR_raise(ERR_LIB_X509V3, ERR_R_X509V3_LIB);
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) {
ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_NULL_VALUE);
return NULL;
}
bn = BN_new();
if (bn == NULL) {
ERR_raise(ERR_LIB_X509V3, ERR_R_BN_LIB);
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);
ERR_raise(ERR_LIB_X509V3, 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) {
ERR_raise(ERR_LIB_X509V3, 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:
ERR_raise(ERR_LIB_X509V3, 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)
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) {
ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_EMPTY_NAME);
goto err;
}
q = p + 1;
} else if (c == ',') {
*p = 0;
ntmp = strip_spaces(q);
q = p + 1;
if (!ntmp) {
ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_EMPTY_NAME);
goto err;
}
if (!X509V3_add_value(ntmp, NULL, &values)) {
goto err;
}
}
break;
case HDR_VALUE:
if (c == ',') {
state = HDR_NAME;
*p = 0;
vtmp = strip_spaces(q);
if (!vtmp) {
ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_NULL_VALUE);
goto err;
}
if (!X509V3_add_value(ntmp, vtmp, &values)) {
goto err;
}
ntmp = NULL;
q = p + 1;
}
}
}
if (state == HDR_VALUE) {
vtmp = strip_spaces(q);
if (!vtmp) {
ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_NULL_VALUE);
goto err;
}
if (!X509V3_add_value(ntmp, vtmp, &values)) {
goto err;
}
} else {
ntmp = strip_spaces(q);
if (!ntmp) {
ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_EMPTY_NAME);
goto err;
}
if (!X509V3_add_value(ntmp, NULL, &values)) {
goto err;
}
}
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 ossl_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 == NULL || email->length == 0)
return 1;
if (memchr(email->data, 0, email->length) != NULL)
return 1;
if (*sk == NULL)
*sk = sk_OPENSSL_STRING_new(sk_strcmp);
if (*sk == NULL)
return 0;
emtmp = OPENSSL_strndup((char *)email->data, email->length);
if (emtmp == NULL) {
X509_email_free(*sk);
*sk = NULL;
return 0;
}
/* Don't add duplicates */
if (sk_OPENSSL_STRING_find(*sk, emtmp) != -1) {
OPENSSL_free(emtmp);
return 1;
}
if (!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 && HAS_CASE_PREFIX((const char *)subject, "xn--"))
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 && HAS_CASE_PREFIX((const char *)&p[i], "xn--"))
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 != NULL) {
*peername = OPENSSL_strndup((char *)a->data, a->length);
if (*peername == NULL)
return -1;
}
} 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 != NULL) {
*peername = OPENSSL_strndup((char *)astr, astrlen);
if (*peername == NULL) {
OPENSSL_free(astr);
return -1;
}
}
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);
switch (gen->type) {
default:
continue;
case GEN_OTHERNAME:
switch (OBJ_obj2nid(gen->d.otherName->type_id)) {
default:
continue;
case NID_id_on_SmtpUTF8Mailbox:
/*-
* https://datatracker.ietf.org/doc/html/rfc8398#section-3
*
* Due to name constraint compatibility reasons described
* in Section 6, SmtpUTF8Mailbox subjectAltName MUST NOT
* be used unless the local-part of the email address
* contains non-ASCII characters. When the local-part is
* ASCII, rfc822Name subjectAltName MUST be used instead
* of SmtpUTF8Mailbox. This is compatible with legacy
* software that supports only rfc822Name (and not
* SmtpUTF8Mailbox). [...]
*
* SmtpUTF8Mailbox is encoded as UTF8String.
*
* If it is not a UTF8String then that is unexpected, and
* we ignore the invalid SAN (neither set san_present nor
* consider it a candidate for equality). This does mean
* that the subject CN may be considered, as would be the
* case when the malformed SmtpUtf8Mailbox SAN is instead
* simply absent.
*
* When CN-ID matching is not desirable, applications can
* choose to turn it off, doing so is at this time a best
* practice.
*/
if (check_type != GEN_EMAIL
|| gen->d.otherName->value->type != V_ASN1_UTF8STRING)
continue;
alt_type = 0;
cstr = gen->d.otherName->value->value.utf8string;
break;
}
break;
case GEN_EMAIL:
if (check_type != GEN_EMAIL)
continue;
cstr = gen->d.rfc822Name;
break;
case GEN_DNS:
if (check_type != GEN_DNS)
continue;
cstr = gen->d.dNSName;
break;
case GEN_IPADD:
if (check_type != GEN_IPADD)
continue;
cstr = gen->d.iPAddress;
break;
}
san_present = 1;
/* 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,