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boringssl/crypto/x509/x509_lu.c
Adam Langley 28feb92a5b Add |X509_STORE_set0_additional_untrusted|. 
X509_STORE_set0_additional_untrusted allows one to set a stack of
additional untrusted certificates that can be used during chain
building. These will be merged with the untrusted certificates set on
the |X509_STORE_CTX|.

Change-Id: I3f011fb0854e16a883a798356af0a24cbc5a9d68
Reviewed-on: https://boringssl-review.googlesource.com/12980
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
2016-12-21 00:20:43 +00:00

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/* crypto/x509/x509_lu.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* 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 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 acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS 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 AUTHOR OR 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#include <string.h>
#include <openssl/err.h>
#include <openssl/lhash.h>
#include <openssl/mem.h>
#include <openssl/thread.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include "../internal.h"
X509_LOOKUP *X509_LOOKUP_new(X509_LOOKUP_METHOD *method)
{
X509_LOOKUP *ret;
ret = (X509_LOOKUP *)OPENSSL_malloc(sizeof(X509_LOOKUP));
if (ret == NULL)
return NULL;
ret->init = 0;
ret->skip = 0;
ret->method = method;
ret->method_data = NULL;
ret->store_ctx = NULL;
if ((method->new_item != NULL) && !method->new_item(ret)) {
OPENSSL_free(ret);
return NULL;
}
return ret;
}
void X509_LOOKUP_free(X509_LOOKUP *ctx)
{
if (ctx == NULL)
return;
if ((ctx->method != NULL) && (ctx->method->free != NULL))
(*ctx->method->free) (ctx);
OPENSSL_free(ctx);
}
int X509_LOOKUP_init(X509_LOOKUP *ctx)
{
if (ctx->method == NULL)
return 0;
if (ctx->method->init != NULL)
return ctx->method->init(ctx);
else
return 1;
}
int X509_LOOKUP_shutdown(X509_LOOKUP *ctx)
{
if (ctx->method == NULL)
return 0;
if (ctx->method->shutdown != NULL)
return ctx->method->shutdown(ctx);
else
return 1;
}
int X509_LOOKUP_ctrl(X509_LOOKUP *ctx, int cmd, const char *argc, long argl,
char **ret)
{
if (ctx->method == NULL)
return -1;
if (ctx->method->ctrl != NULL)
return ctx->method->ctrl(ctx, cmd, argc, argl, ret);
else
return 1;
}
int X509_LOOKUP_by_subject(X509_LOOKUP *ctx, int type, X509_NAME *name,
X509_OBJECT *ret)
{
if ((ctx->method == NULL) || (ctx->method->get_by_subject == NULL))
return 0;
if (ctx->skip)
return 0;
return ctx->method->get_by_subject(ctx, type, name, ret) > 0;
}
int X509_LOOKUP_by_issuer_serial(X509_LOOKUP *ctx, int type, X509_NAME *name,
ASN1_INTEGER *serial, X509_OBJECT *ret)
{
if ((ctx->method == NULL) || (ctx->method->get_by_issuer_serial == NULL))
return 0;
return ctx->method->get_by_issuer_serial(ctx, type, name, serial, ret) > 0;
}
int X509_LOOKUP_by_fingerprint(X509_LOOKUP *ctx, int type,
unsigned char *bytes, int len,
X509_OBJECT *ret)
{
if ((ctx->method == NULL) || (ctx->method->get_by_fingerprint == NULL))
return 0;
return ctx->method->get_by_fingerprint(ctx, type, bytes, len, ret) > 0;
}
int X509_LOOKUP_by_alias(X509_LOOKUP *ctx, int type, char *str, int len,
X509_OBJECT *ret)
{
if ((ctx->method == NULL) || (ctx->method->get_by_alias == NULL))
return 0;
return ctx->method->get_by_alias(ctx, type, str, len, ret) > 0;
}
static int x509_object_cmp(const X509_OBJECT **a, const X509_OBJECT **b)
{
int ret;
ret = ((*a)->type - (*b)->type);
if (ret)
return ret;
switch ((*a)->type) {
case X509_LU_X509:
ret = X509_subject_name_cmp((*a)->data.x509, (*b)->data.x509);
break;
case X509_LU_CRL:
ret = X509_CRL_cmp((*a)->data.crl, (*b)->data.crl);
break;
default:
/* abort(); */
return 0;
}
return ret;
}
X509_STORE *X509_STORE_new(void)
{
X509_STORE *ret;
if ((ret = (X509_STORE *)OPENSSL_malloc(sizeof(X509_STORE))) == NULL)
return NULL;
memset(ret, 0, sizeof(*ret));
CRYPTO_MUTEX_init(&ret->objs_lock);
ret->objs = sk_X509_OBJECT_new(x509_object_cmp);
if (ret->objs == NULL)
goto err;
ret->cache = 1;
ret->get_cert_methods = sk_X509_LOOKUP_new_null();
if (ret->get_cert_methods == NULL)
goto err;
ret->param = X509_VERIFY_PARAM_new();
if (ret->param == NULL)
goto err;
ret->references = 1;
return ret;
err:
if (ret) {
CRYPTO_MUTEX_cleanup(&ret->objs_lock);
if (ret->param)
X509_VERIFY_PARAM_free(ret->param);
if (ret->get_cert_methods)
sk_X509_LOOKUP_free(ret->get_cert_methods);
if (ret->objs)
sk_X509_OBJECT_free(ret->objs);
OPENSSL_free(ret);
}
return NULL;
}
int X509_STORE_up_ref(X509_STORE *store)
{
CRYPTO_refcount_inc(&store->references);
return 1;
}
static void cleanup(X509_OBJECT *a)
{
if (a == NULL) {
return;
}
if (a->type == X509_LU_X509) {
X509_free(a->data.x509);
} else if (a->type == X509_LU_CRL) {
X509_CRL_free(a->data.crl);
} else {
/* abort(); */
}
OPENSSL_free(a);
}
void X509_STORE_free(X509_STORE *vfy)
{
size_t j;
STACK_OF(X509_LOOKUP) *sk;
X509_LOOKUP *lu;
if (vfy == NULL)
return;
if (!CRYPTO_refcount_dec_and_test_zero(&vfy->references)) {
return;
}
CRYPTO_MUTEX_cleanup(&vfy->objs_lock);
sk = vfy->get_cert_methods;
for (j = 0; j < sk_X509_LOOKUP_num(sk); j++) {
lu = sk_X509_LOOKUP_value(sk, j);
X509_LOOKUP_shutdown(lu);
X509_LOOKUP_free(lu);
}
sk_X509_LOOKUP_free(sk);
sk_X509_OBJECT_pop_free(vfy->objs, cleanup);
if (vfy->param)
X509_VERIFY_PARAM_free(vfy->param);
OPENSSL_free(vfy);
}
X509_LOOKUP *X509_STORE_add_lookup(X509_STORE *v, X509_LOOKUP_METHOD *m)
{
size_t i;
STACK_OF(X509_LOOKUP) *sk;
X509_LOOKUP *lu;
sk = v->get_cert_methods;
for (i = 0; i < sk_X509_LOOKUP_num(sk); i++) {
lu = sk_X509_LOOKUP_value(sk, i);
if (m == lu->method) {
return lu;
}
}
/* a new one */
lu = X509_LOOKUP_new(m);
if (lu == NULL)
return NULL;
else {
lu->store_ctx = v;
if (sk_X509_LOOKUP_push(v->get_cert_methods, lu))
return lu;
else {
X509_LOOKUP_free(lu);
return NULL;
}
}
}
int X509_STORE_get_by_subject(X509_STORE_CTX *vs, int type, X509_NAME *name,
X509_OBJECT *ret)
{
X509_STORE *ctx = vs->ctx;
X509_LOOKUP *lu;
X509_OBJECT stmp, *tmp;
int i;
CRYPTO_MUTEX_lock_write(&ctx->objs_lock);
tmp = X509_OBJECT_retrieve_by_subject(ctx->objs, type, name);
CRYPTO_MUTEX_unlock_write(&ctx->objs_lock);
if (tmp == NULL || type == X509_LU_CRL) {
for (i = 0; i < (int)sk_X509_LOOKUP_num(ctx->get_cert_methods); i++) {
lu = sk_X509_LOOKUP_value(ctx->get_cert_methods, i);
if (X509_LOOKUP_by_subject(lu, type, name, &stmp)) {
tmp = &stmp;
break;
}
}
if (tmp == NULL)
return 0;
}
/*
* if (ret->data.ptr != NULL) X509_OBJECT_free_contents(ret);
*/
ret->type = tmp->type;
ret->data.ptr = tmp->data.ptr;
X509_OBJECT_up_ref_count(ret);
return 1;
}
int X509_STORE_add_cert(X509_STORE *ctx, X509 *x)
{
X509_OBJECT *obj;
int ret = 1;
if (x == NULL)
return 0;
obj = (X509_OBJECT *)OPENSSL_malloc(sizeof(X509_OBJECT));
if (obj == NULL) {
OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
return 0;
}
obj->type = X509_LU_X509;
obj->data.x509 = x;
CRYPTO_MUTEX_lock_write(&ctx->objs_lock);
X509_OBJECT_up_ref_count(obj);
if (X509_OBJECT_retrieve_match(ctx->objs, obj)) {
X509_OBJECT_free_contents(obj);
OPENSSL_free(obj);
OPENSSL_PUT_ERROR(X509, X509_R_CERT_ALREADY_IN_HASH_TABLE);
ret = 0;
} else
sk_X509_OBJECT_push(ctx->objs, obj);
CRYPTO_MUTEX_unlock_write(&ctx->objs_lock);
return ret;
}
int X509_STORE_add_crl(X509_STORE *ctx, X509_CRL *x)
{
X509_OBJECT *obj;
int ret = 1;
if (x == NULL)
return 0;
obj = (X509_OBJECT *)OPENSSL_malloc(sizeof(X509_OBJECT));
if (obj == NULL) {
OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
return 0;
}
obj->type = X509_LU_CRL;
obj->data.crl = x;
CRYPTO_MUTEX_lock_write(&ctx->objs_lock);
X509_OBJECT_up_ref_count(obj);
if (X509_OBJECT_retrieve_match(ctx->objs, obj)) {
X509_OBJECT_free_contents(obj);
OPENSSL_free(obj);
OPENSSL_PUT_ERROR(X509, X509_R_CERT_ALREADY_IN_HASH_TABLE);
ret = 0;
} else
sk_X509_OBJECT_push(ctx->objs, obj);
CRYPTO_MUTEX_unlock_write(&ctx->objs_lock);
return ret;
}
void X509_STORE_set0_additional_untrusted(X509_STORE *ctx,
STACK_OF(X509) *untrusted) {
ctx->additional_untrusted = untrusted;
}
int X509_OBJECT_up_ref_count(X509_OBJECT *a)
{
switch (a->type) {
case X509_LU_X509:
X509_up_ref(a->data.x509);
break;
case X509_LU_CRL:
X509_CRL_up_ref(a->data.crl);
break;
}
return 1;
}
void X509_OBJECT_free_contents(X509_OBJECT *a)
{
switch (a->type) {
case X509_LU_X509:
X509_free(a->data.x509);
break;
case X509_LU_CRL:
X509_CRL_free(a->data.crl);
break;
}
}
static int x509_object_idx_cnt(STACK_OF(X509_OBJECT) *h, int type,
X509_NAME *name, int *pnmatch)
{
X509_OBJECT stmp;
X509 x509_s;
X509_CINF cinf_s;
X509_CRL crl_s;
X509_CRL_INFO crl_info_s;
stmp.type = type;
switch (type) {
case X509_LU_X509:
stmp.data.x509 = &x509_s;
x509_s.cert_info = &cinf_s;
cinf_s.subject = name;
break;
case X509_LU_CRL:
stmp.data.crl = &crl_s;
crl_s.crl = &crl_info_s;
crl_info_s.issuer = name;
break;
default:
/* abort(); */
return -1;
}
size_t idx;
if (!sk_X509_OBJECT_find(h, &idx, &stmp))
return -1;
if (pnmatch != NULL) {
int tidx;
const X509_OBJECT *tobj, *pstmp;
*pnmatch = 1;
pstmp = &stmp;
for (tidx = idx + 1; tidx < (int)sk_X509_OBJECT_num(h); tidx++) {
tobj = sk_X509_OBJECT_value(h, tidx);
if (x509_object_cmp(&tobj, &pstmp))
break;
(*pnmatch)++;
}
}
return idx;
}
int X509_OBJECT_idx_by_subject(STACK_OF(X509_OBJECT) *h, int type,
X509_NAME *name)
{
return x509_object_idx_cnt(h, type, name, NULL);
}
X509_OBJECT *X509_OBJECT_retrieve_by_subject(STACK_OF(X509_OBJECT) *h,
int type, X509_NAME *name)
{
int idx;
idx = X509_OBJECT_idx_by_subject(h, type, name);
if (idx == -1)
return NULL;
return sk_X509_OBJECT_value(h, idx);
}
STACK_OF (X509) * X509_STORE_get1_certs(X509_STORE_CTX *ctx, X509_NAME *nm)
{
int i, idx, cnt;
STACK_OF(X509) *sk;
X509 *x;
X509_OBJECT *obj;
sk = sk_X509_new_null();
if (sk == NULL)
return NULL;
CRYPTO_MUTEX_lock_write(&ctx->ctx->objs_lock);
idx = x509_object_idx_cnt(ctx->ctx->objs, X509_LU_X509, nm, &cnt);
if (idx < 0) {
/*
* Nothing found in cache: do lookup to possibly add new objects to
* cache
*/
X509_OBJECT xobj;
CRYPTO_MUTEX_unlock_write(&ctx->ctx->objs_lock);
if (!X509_STORE_get_by_subject(ctx, X509_LU_X509, nm, &xobj)) {
sk_X509_free(sk);
return NULL;
}
X509_OBJECT_free_contents(&xobj);
CRYPTO_MUTEX_lock_write(&ctx->ctx->objs_lock);
idx = x509_object_idx_cnt(ctx->ctx->objs, X509_LU_X509, nm, &cnt);
if (idx < 0) {
CRYPTO_MUTEX_unlock_write(&ctx->ctx->objs_lock);
sk_X509_free(sk);
return NULL;
}
}
for (i = 0; i < cnt; i++, idx++) {
obj = sk_X509_OBJECT_value(ctx->ctx->objs, idx);
x = obj->data.x509;
if (!sk_X509_push(sk, x)) {
CRYPTO_MUTEX_unlock_write(&ctx->ctx->objs_lock);
sk_X509_pop_free(sk, X509_free);
return NULL;
}
X509_up_ref(x);
}
CRYPTO_MUTEX_unlock_write(&ctx->ctx->objs_lock);
return sk;
}
STACK_OF (X509_CRL) * X509_STORE_get1_crls(X509_STORE_CTX *ctx, X509_NAME *nm)
{
int i, idx, cnt;
STACK_OF(X509_CRL) *sk;
X509_CRL *x;
X509_OBJECT *obj, xobj;
sk = sk_X509_CRL_new_null();
if (sk == NULL)
return NULL;
/* Always do lookup to possibly add new CRLs to cache. */
if (!X509_STORE_get_by_subject(ctx, X509_LU_CRL, nm, &xobj)) {
sk_X509_CRL_free(sk);
return NULL;
}
X509_OBJECT_free_contents(&xobj);
CRYPTO_MUTEX_lock_write(&ctx->ctx->objs_lock);
idx = x509_object_idx_cnt(ctx->ctx->objs, X509_LU_CRL, nm, &cnt);
if (idx < 0) {
CRYPTO_MUTEX_unlock_write(&ctx->ctx->objs_lock);
sk_X509_CRL_free(sk);
return NULL;
}
for (i = 0; i < cnt; i++, idx++) {
obj = sk_X509_OBJECT_value(ctx->ctx->objs, idx);
x = obj->data.crl;
X509_CRL_up_ref(x);
if (!sk_X509_CRL_push(sk, x)) {
CRYPTO_MUTEX_unlock_write(&ctx->ctx->objs_lock);
X509_CRL_free(x);
sk_X509_CRL_pop_free(sk, X509_CRL_free);
return NULL;
}
}
CRYPTO_MUTEX_unlock_write(&ctx->ctx->objs_lock);
return sk;
}
X509_OBJECT *X509_OBJECT_retrieve_match(STACK_OF(X509_OBJECT) *h,
X509_OBJECT *x)
{
size_t idx, i;
X509_OBJECT *obj;
if (!sk_X509_OBJECT_find(h, &idx, x)) {
return NULL;
}
if ((x->type != X509_LU_X509) && (x->type != X509_LU_CRL))
return sk_X509_OBJECT_value(h, idx);
for (i = idx; i < sk_X509_OBJECT_num(h); i++) {
obj = sk_X509_OBJECT_value(h, i);
if (x509_object_cmp
((const X509_OBJECT **)&obj, (const X509_OBJECT **)&x))
return NULL;
if (x->type == X509_LU_X509) {
if (!X509_cmp(obj->data.x509, x->data.x509))
return obj;
} else if (x->type == X509_LU_CRL) {
if (!X509_CRL_match(obj->data.crl, x->data.crl))
return obj;
} else
return obj;
}
return NULL;
}
/*
* Try to get issuer certificate from store. Due to limitations of the API
* this can only retrieve a single certificate matching a given subject name.
* However it will fill the cache with all matching certificates, so we can
* examine the cache for all matches. Return values are: 1 lookup
* successful. 0 certificate not found. -1 some other error.
*/
int X509_STORE_CTX_get1_issuer(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
{
X509_NAME *xn;
X509_OBJECT obj, *pobj;
int idx, ret;
size_t i;
xn = X509_get_issuer_name(x);
if (!X509_STORE_get_by_subject(ctx, X509_LU_X509, xn, &obj))
return 0;
/* If certificate matches all OK */
if (ctx->check_issued(ctx, x, obj.data.x509)) {
*issuer = obj.data.x509;
return 1;
}
X509_OBJECT_free_contents(&obj);
/* Else find index of first cert accepted by 'check_issued' */
ret = 0;
CRYPTO_MUTEX_lock_write(&ctx->ctx->objs_lock);
idx = X509_OBJECT_idx_by_subject(ctx->ctx->objs, X509_LU_X509, xn);
if (idx != -1) { /* should be true as we've had at least one
* match */
/* Look through all matching certs for suitable issuer */
for (i = idx; i < sk_X509_OBJECT_num(ctx->ctx->objs); i++) {
pobj = sk_X509_OBJECT_value(ctx->ctx->objs, i);
/* See if we've run past the matches */
if (pobj->type != X509_LU_X509)
break;
if (X509_NAME_cmp(xn, X509_get_subject_name(pobj->data.x509)))
break;
if (ctx->check_issued(ctx, x, pobj->data.x509)) {
*issuer = pobj->data.x509;
X509_OBJECT_up_ref_count(pobj);
ret = 1;
break;
}
}
}
CRYPTO_MUTEX_unlock_write(&ctx->ctx->objs_lock);
return ret;
}
int X509_STORE_set_flags(X509_STORE *ctx, unsigned long flags)
{
return X509_VERIFY_PARAM_set_flags(ctx->param, flags);
}
int X509_STORE_set_depth(X509_STORE *ctx, int depth)
{
X509_VERIFY_PARAM_set_depth(ctx->param, depth);
return 1;
}
int X509_STORE_set_purpose(X509_STORE *ctx, int purpose)
{
return X509_VERIFY_PARAM_set_purpose(ctx->param, purpose);
}
int X509_STORE_set_trust(X509_STORE *ctx, int trust)
{
return X509_VERIFY_PARAM_set_trust(ctx->param, trust);
}
int X509_STORE_set1_param(X509_STORE *ctx, X509_VERIFY_PARAM *param)
{
return X509_VERIFY_PARAM_set1(ctx->param, param);
}
void X509_STORE_set_verify_cb(X509_STORE *ctx,
int (*verify_cb) (int, X509_STORE_CTX *))
{
ctx->verify_cb = verify_cb;
}
void X509_STORE_set_lookup_crls_cb(X509_STORE *ctx,
STACK_OF (X509_CRL) *
(*cb) (X509_STORE_CTX *ctx, X509_NAME *nm))
{
ctx->lookup_crls = cb;
}
X509_STORE *X509_STORE_CTX_get0_store(X509_STORE_CTX *ctx)
{
return ctx->ctx;
}
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