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openssl/crypto/x509/x509_vpm.c
Christian Heimes dfccfde065 Inherit hostflags verify params even without hosts 
X509_VERIFY_PARAM_inherit() now copies hostflags independently of hosts.

Previously hostflags were only copied when at least one host was set.
Typically applications don't configure hosts on SSL_CTX. The change
enables applications to configure hostflags on SSL_CTX and have OpenSSL
copy the flags from SSL_CTX to SSL.

Fixes: https://github.com/openssl/openssl/issues/14579
Signed-off-by: Christian Heimes <christian@python.org>

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14743)
2021-04-09 08:32:38 +10:00

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/*
* Copyright 2004-2021 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
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/crypto.h>
#include <openssl/buffer.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include "crypto/x509.h"
#include "x509_local.h"
/* X509_VERIFY_PARAM functions */
#define SET_HOST 0
#define ADD_HOST 1
static char *str_copy(const char *s)
{
return OPENSSL_strdup(s);
}
static void str_free(char *s)
{
OPENSSL_free(s);
}
static int int_x509_param_set_hosts(X509_VERIFY_PARAM *vpm, int mode,
const char *name, size_t namelen)
{
char *copy;
/*
* Refuse names with embedded NUL bytes, except perhaps as final byte.
* XXX: Do we need to push an error onto the error stack?
*/
if (namelen == 0 || name == NULL)
namelen = name ? strlen(name) : 0;
else if (name && memchr(name, '\0', namelen > 1 ? namelen - 1 : namelen))
return 0;
if (namelen > 0 && name[namelen - 1] == '\0')
--namelen;
if (mode == SET_HOST) {
sk_OPENSSL_STRING_pop_free(vpm->hosts, str_free);
vpm->hosts = NULL;
}
if (name == NULL || namelen == 0)
return 1;
copy = OPENSSL_strndup(name, namelen);
if (copy == NULL)
return 0;
if (vpm->hosts == NULL &&
(vpm->hosts = sk_OPENSSL_STRING_new_null()) == NULL) {
OPENSSL_free(copy);
return 0;
}
if (!sk_OPENSSL_STRING_push(vpm->hosts, copy)) {
OPENSSL_free(copy);
if (sk_OPENSSL_STRING_num(vpm->hosts) == 0) {
sk_OPENSSL_STRING_free(vpm->hosts);
vpm->hosts = NULL;
}
return 0;
}
return 1;
}
X509_VERIFY_PARAM *X509_VERIFY_PARAM_new(void)
{
X509_VERIFY_PARAM *param;
param = OPENSSL_zalloc(sizeof(*param));
if (param == NULL) {
ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
return NULL;
}
param->trust = X509_TRUST_DEFAULT;
/* param->inh_flags = X509_VP_FLAG_DEFAULT; */
param->depth = -1;
param->auth_level = -1; /* -1 means unset, 0 is explicit */
return param;
}
void X509_VERIFY_PARAM_free(X509_VERIFY_PARAM *param)
{
if (param == NULL)
return;
sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
sk_OPENSSL_STRING_pop_free(param->hosts, str_free);
OPENSSL_free(param->peername);
OPENSSL_free(param->email);
OPENSSL_free(param->ip);
OPENSSL_free(param);
}
/*-
* This function determines how parameters are "inherited" from one structure
* to another. There are several different ways this can happen.
*
* 1. If a child structure needs to have its values initialized from a parent
* they are simply copied across. For example SSL_CTX copied to SSL.
* 2. If the structure should take on values only if they are currently unset.
* For example the values in an SSL structure will take appropriate value
* for SSL servers or clients but only if the application has not set new
* ones.
*
* The "inh_flags" field determines how this function behaves.
*
* Normally any values which are set in the default are not copied from the
* destination and verify flags are ORed together.
*
* If X509_VP_FLAG_DEFAULT is set then anything set in the source is copied
* to the destination. Effectively the values in "to" become default values
* which will be used only if nothing new is set in "from".
*
* If X509_VP_FLAG_OVERWRITE is set then all value are copied across whether
* they are set or not. Flags is still Ored though.
*
* If X509_VP_FLAG_RESET_FLAGS is set then the flags value is copied instead
* of ORed.
*
* If X509_VP_FLAG_LOCKED is set then no values are copied.
*
* If X509_VP_FLAG_ONCE is set then the current inh_flags setting is zeroed
* after the next call.
*/
/* Macro to test if a field should be copied from src to dest */
#define test_x509_verify_param_copy(field, def) \
(to_overwrite \
|| ((src->field != def) && (to_default || (dest->field == def))))
/* Macro to test and copy a field if necessary */
#define x509_verify_param_copy(field, def) \
if (test_x509_verify_param_copy(field, def)) \
dest->field = src->field;
int X509_VERIFY_PARAM_inherit(X509_VERIFY_PARAM *dest,
const X509_VERIFY_PARAM *src)
{
unsigned long inh_flags;
int to_default, to_overwrite;
if (!src)
return 1;
inh_flags = dest->inh_flags | src->inh_flags;
if (inh_flags & X509_VP_FLAG_ONCE)
dest->inh_flags = 0;
if (inh_flags & X509_VP_FLAG_LOCKED)
return 1;
if (inh_flags & X509_VP_FLAG_DEFAULT)
to_default = 1;
else
to_default = 0;
if (inh_flags & X509_VP_FLAG_OVERWRITE)
to_overwrite = 1;
else
to_overwrite = 0;
x509_verify_param_copy(purpose, 0);
x509_verify_param_copy(trust, X509_TRUST_DEFAULT);
x509_verify_param_copy(depth, -1);
x509_verify_param_copy(auth_level, -1);
/* If overwrite or check time not set, copy across */
if (to_overwrite || !(dest->flags & X509_V_FLAG_USE_CHECK_TIME)) {
dest->check_time = src->check_time;
dest->flags &= ~X509_V_FLAG_USE_CHECK_TIME;
/* Don't need to copy flag: that is done below */
}
if (inh_flags & X509_VP_FLAG_RESET_FLAGS)
dest->flags = 0;
dest->flags |= src->flags;
if (test_x509_verify_param_copy(policies, NULL)) {
if (!X509_VERIFY_PARAM_set1_policies(dest, src->policies))
return 0;
}
x509_verify_param_copy(hostflags, 0);
if (test_x509_verify_param_copy(hosts, NULL)) {
sk_OPENSSL_STRING_pop_free(dest->hosts, str_free);
dest->hosts = NULL;
if (src->hosts) {
dest->hosts =
sk_OPENSSL_STRING_deep_copy(src->hosts, str_copy, str_free);
if (dest->hosts == NULL)
return 0;
}
}
if (test_x509_verify_param_copy(email, NULL)) {
if (!X509_VERIFY_PARAM_set1_email(dest, src->email, src->emaillen))
return 0;
}
if (test_x509_verify_param_copy(ip, NULL)) {
if (!X509_VERIFY_PARAM_set1_ip(dest, src->ip, src->iplen))
return 0;
}
return 1;
}
int X509_VERIFY_PARAM_set1(X509_VERIFY_PARAM *to,
const X509_VERIFY_PARAM *from)
{
unsigned long save_flags = to->inh_flags;
int ret;
to->inh_flags |= X509_VP_FLAG_DEFAULT;
ret = X509_VERIFY_PARAM_inherit(to, from);
to->inh_flags = save_flags;
return ret;
}
static int int_x509_param_set1(char **pdest, size_t *pdestlen,
const char *src, size_t srclen)
{
char *tmp;
if (src) {
if (srclen == 0)
srclen = strlen(src);
tmp = OPENSSL_malloc(srclen + 1);
if (tmp == NULL)
return 0;
memcpy(tmp, src, srclen);
tmp[srclen] = '\0'; /* enforce NUL termination */
} else {
tmp = NULL;
srclen = 0;
}
OPENSSL_free(*pdest);
*pdest = tmp;
if (pdestlen != NULL)
*pdestlen = srclen;
return 1;
}
int X509_VERIFY_PARAM_set1_name(X509_VERIFY_PARAM *param, const char *name)
{
OPENSSL_free(param->name);
param->name = OPENSSL_strdup(name);
if (param->name)
return 1;
return 0;
}
int X509_VERIFY_PARAM_set_flags(X509_VERIFY_PARAM *param, unsigned long flags)
{
param->flags |= flags;
if (flags & X509_V_FLAG_POLICY_MASK)
param->flags |= X509_V_FLAG_POLICY_CHECK;
return 1;
}
int X509_VERIFY_PARAM_clear_flags(X509_VERIFY_PARAM *param,
unsigned long flags)
{
param->flags &= ~flags;
return 1;
}
unsigned long X509_VERIFY_PARAM_get_flags(const X509_VERIFY_PARAM *param)
{
return param->flags;
}
uint32_t X509_VERIFY_PARAM_get_inh_flags(const X509_VERIFY_PARAM *param)
{
return param->inh_flags;
}
int X509_VERIFY_PARAM_set_inh_flags(X509_VERIFY_PARAM *param, uint32_t flags)
{
param->inh_flags = flags;
return 1;
}
int X509_VERIFY_PARAM_set_purpose(X509_VERIFY_PARAM *param, int purpose)
{
return X509_PURPOSE_set(&param->purpose, purpose);
}
int X509_VERIFY_PARAM_set_trust(X509_VERIFY_PARAM *param, int trust)
{
return X509_TRUST_set(&param->trust, trust);
}
void X509_VERIFY_PARAM_set_depth(X509_VERIFY_PARAM *param, int depth)
{
param->depth = depth;
}
void X509_VERIFY_PARAM_set_auth_level(X509_VERIFY_PARAM *param, int auth_level)
{
param->auth_level = auth_level;
}
time_t X509_VERIFY_PARAM_get_time(const X509_VERIFY_PARAM *param)
{
return param->check_time;
}
void X509_VERIFY_PARAM_set_time(X509_VERIFY_PARAM *param, time_t t)
{
param->check_time = t;
param->flags |= X509_V_FLAG_USE_CHECK_TIME;
}
int X509_VERIFY_PARAM_add0_policy(X509_VERIFY_PARAM *param,
ASN1_OBJECT *policy)
{
if (param->policies == NULL) {
param->policies = sk_ASN1_OBJECT_new_null();
if (param->policies == NULL)
return 0;
}
if (!sk_ASN1_OBJECT_push(param->policies, policy))
return 0;
return 1;
}
int X509_VERIFY_PARAM_set1_policies(X509_VERIFY_PARAM *param,
STACK_OF(ASN1_OBJECT) *policies)
{
int i;
ASN1_OBJECT *oid, *doid;
if (param == NULL)
return 0;
sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
if (policies == NULL) {
param->policies = NULL;
return 1;
}
param->policies = sk_ASN1_OBJECT_new_null();
if (param->policies == NULL)
return 0;
for (i = 0; i < sk_ASN1_OBJECT_num(policies); i++) {
oid = sk_ASN1_OBJECT_value(policies, i);
doid = OBJ_dup(oid);
if (!doid)
return 0;
if (!sk_ASN1_OBJECT_push(param->policies, doid)) {
ASN1_OBJECT_free(doid);
return 0;
}
}
param->flags |= X509_V_FLAG_POLICY_CHECK;
return 1;
}
char *X509_VERIFY_PARAM_get0_host(X509_VERIFY_PARAM *param, int idx)
{
return sk_OPENSSL_STRING_value(param->hosts, idx);
}
int X509_VERIFY_PARAM_set1_host(X509_VERIFY_PARAM *param,
const char *name, size_t namelen)
{
return int_x509_param_set_hosts(param, SET_HOST, name, namelen);
}
int X509_VERIFY_PARAM_add1_host(X509_VERIFY_PARAM *param,
const char *name, size_t namelen)
{
return int_x509_param_set_hosts(param, ADD_HOST, name, namelen);
}
void X509_VERIFY_PARAM_set_hostflags(X509_VERIFY_PARAM *param,
unsigned int flags)
{
param->hostflags = flags;
}
unsigned int X509_VERIFY_PARAM_get_hostflags(const X509_VERIFY_PARAM *param)
{
return param->hostflags;
}
char *X509_VERIFY_PARAM_get0_peername(const X509_VERIFY_PARAM *param)
{
return param->peername;
}
/*
* Move peername from one param structure to another, freeing any name present
* at the target. If the source is a NULL parameter structure, free and zero
* the target peername.
*/
void X509_VERIFY_PARAM_move_peername(X509_VERIFY_PARAM *to,
X509_VERIFY_PARAM *from)
{
char *peername = (from != NULL) ? from->peername : NULL;
if (to->peername != peername) {
OPENSSL_free(to->peername);
to->peername = peername;
}
if (from)
from->peername = NULL;
}
char *X509_VERIFY_PARAM_get0_email(X509_VERIFY_PARAM *param)
{
return param->email;
}
int X509_VERIFY_PARAM_set1_email(X509_VERIFY_PARAM *param,
const char *email, size_t emaillen)
{
return int_x509_param_set1(&param->email, &param->emaillen,
email, emaillen);
}
static unsigned char
*int_X509_VERIFY_PARAM_get0_ip(X509_VERIFY_PARAM *param, size_t *plen)
{
if (param == NULL || param->ip == NULL)
return NULL;
if (plen != NULL)
*plen = param->iplen;
return param->ip;
}
char *X509_VERIFY_PARAM_get1_ip_asc(X509_VERIFY_PARAM *param)
{
size_t iplen;
unsigned char *ip = int_X509_VERIFY_PARAM_get0_ip(param, &iplen);
return ip == NULL ? NULL : ossl_ipaddr_to_asc(ip, iplen);
}
int X509_VERIFY_PARAM_set1_ip(X509_VERIFY_PARAM *param,
const unsigned char *ip, size_t iplen)
{
if (iplen != 0 && iplen != 4 && iplen != 16)
return 0;
return int_x509_param_set1((char **)&param->ip, &param->iplen,
(char *)ip, iplen);
}
int X509_VERIFY_PARAM_set1_ip_asc(X509_VERIFY_PARAM *param, const char *ipasc)
{
unsigned char ipout[16];
size_t iplen;
iplen = (size_t)ossl_a2i_ipadd(ipout, ipasc);
if (iplen == 0)
return 0;
return X509_VERIFY_PARAM_set1_ip(param, ipout, iplen);
}
int X509_VERIFY_PARAM_get_depth(const X509_VERIFY_PARAM *param)
{
return param->depth;
}
int X509_VERIFY_PARAM_get_auth_level(const X509_VERIFY_PARAM *param)
{
return param->auth_level;
}
const char *X509_VERIFY_PARAM_get0_name(const X509_VERIFY_PARAM *param)
{
return param->name;
}
#define vpm_empty_id NULL, 0U, NULL, NULL, 0, NULL, 0
/*
* Default verify parameters: these are used for various applications and can
* be overridden by the user specified table. NB: the 'name' field *must* be
* in alphabetical order because it will be searched using OBJ_search.
*/
static const X509_VERIFY_PARAM default_table[] = {
{
"default", /* X509 default parameters */
0, /* check time to use */
0, /* inheritance flags */
X509_V_FLAG_TRUSTED_FIRST, /* flags */
0, /* purpose */
0, /* trust */
100, /* depth */
-1, /* auth_level */
NULL, /* policies */
vpm_empty_id},
{
"pkcs7", /* S/MIME sign parameters */
0, /* check time to use */
0, /* inheritance flags */
0, /* flags */
X509_PURPOSE_SMIME_SIGN, /* purpose */
X509_TRUST_EMAIL, /* trust */
-1, /* depth */
-1, /* auth_level */
NULL, /* policies */
vpm_empty_id},
{
"smime_sign", /* S/MIME sign parameters */
0, /* check time to use */
0, /* inheritance flags */
0, /* flags */
X509_PURPOSE_SMIME_SIGN, /* purpose */
X509_TRUST_EMAIL, /* trust */
-1, /* depth */
-1, /* auth_level */
NULL, /* policies */
vpm_empty_id},
{
"ssl_client", /* SSL/TLS client parameters */
0, /* check time to use */
0, /* inheritance flags */
0, /* flags */
X509_PURPOSE_SSL_CLIENT, /* purpose */
X509_TRUST_SSL_CLIENT, /* trust */
-1, /* depth */
-1, /* auth_level */
NULL, /* policies */
vpm_empty_id},
{
"ssl_server", /* SSL/TLS server parameters */
0, /* check time to use */
0, /* inheritance flags */
0, /* flags */
X509_PURPOSE_SSL_SERVER, /* purpose */
X509_TRUST_SSL_SERVER, /* trust */
-1, /* depth */
-1, /* auth_level */
NULL, /* policies */
vpm_empty_id}
};
static STACK_OF(X509_VERIFY_PARAM) *param_table = NULL;
static int table_cmp(const X509_VERIFY_PARAM *a, const X509_VERIFY_PARAM *b)
{
return strcmp(a->name, b->name);
}
DECLARE_OBJ_BSEARCH_CMP_FN(X509_VERIFY_PARAM, X509_VERIFY_PARAM, table);
IMPLEMENT_OBJ_BSEARCH_CMP_FN(X509_VERIFY_PARAM, X509_VERIFY_PARAM, table);
static int param_cmp(const X509_VERIFY_PARAM *const *a,
const X509_VERIFY_PARAM *const *b)
{
return strcmp((*a)->name, (*b)->name);
}
int X509_VERIFY_PARAM_add0_table(X509_VERIFY_PARAM *param)
{
int idx;
X509_VERIFY_PARAM *ptmp;
if (param_table == NULL) {
param_table = sk_X509_VERIFY_PARAM_new(param_cmp);
if (param_table == NULL)
return 0;
} else {
idx = sk_X509_VERIFY_PARAM_find(param_table, param);
if (idx >= 0) {
ptmp = sk_X509_VERIFY_PARAM_delete(param_table, idx);
X509_VERIFY_PARAM_free(ptmp);
}
}
if (!sk_X509_VERIFY_PARAM_push(param_table, param))
return 0;
return 1;
}
int X509_VERIFY_PARAM_get_count(void)
{
int num = OSSL_NELEM(default_table);
if (param_table)
num += sk_X509_VERIFY_PARAM_num(param_table);
return num;
}
const X509_VERIFY_PARAM *X509_VERIFY_PARAM_get0(int id)
{
int num = OSSL_NELEM(default_table);
if (id < num)
return default_table + id;
return sk_X509_VERIFY_PARAM_value(param_table, id - num);
}
const X509_VERIFY_PARAM *X509_VERIFY_PARAM_lookup(const char *name)
{
int idx;
X509_VERIFY_PARAM pm;
pm.name = (char *)name;
if (param_table != NULL) {
idx = sk_X509_VERIFY_PARAM_find(param_table, &pm);
if (idx >= 0)
return sk_X509_VERIFY_PARAM_value(param_table, idx);
}
return OBJ_bsearch_table(&pm, default_table, OSSL_NELEM(default_table));
}
void X509_VERIFY_PARAM_table_cleanup(void)
{
sk_X509_VERIFY_PARAM_pop_free(param_table, X509_VERIFY_PARAM_free);
param_table = NULL;
}
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