crypto/x509/x509_lu.c - boringssl - Git at Google

 /* 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;
 }

 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;
 }
	/* 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;
	}

	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;
	}