/* 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 <stdio.h>

#include "cryptlib.h"

#include <openssl/lhash.h>

#include <openssl/x509.h>

#include <openssl/x509v3.h>

EXPORT_C 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;

	}

EXPORT_C 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);

	}

EXPORT_C 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;

	}

EXPORT_C 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;

	}

EXPORT_C 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;

	}

EXPORT_C 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 X509_LU_FAIL;

	if (ctx->skip) return 0;

	return ctx->method->get_by_subject(ctx,type,name,ret);

	}

EXPORT_C 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 X509_LU_FAIL;

	return ctx->method->get_by_issuer_serial(ctx,type,name,serial,ret);

	}

EXPORT_C 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 X509_LU_FAIL;

	return ctx->method->get_by_fingerprint(ctx,type,bytes,len,ret);

	}

EXPORT_C 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 X509_LU_FAIL;

	return ctx->method->get_by_alias(ctx,type,str,len,ret);

	}

static int x509_object_cmp(const X509_OBJECT * const *a, const X509_OBJECT * const *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;

	}

EXPORT_C X509_STORE *X509_STORE_new(void)

	{

	X509_STORE *ret;

	if ((ret=(X509_STORE *)OPENSSL_malloc(sizeof(X509_STORE))) == NULL)

		return NULL;

	ret->objs = sk_X509_OBJECT_new(x509_object_cmp);

	ret->cache=1;

	ret->get_cert_methods=sk_X509_LOOKUP_new_null();

	ret->verify=0;

	ret->verify_cb=0;

	if ((ret->param = X509_VERIFY_PARAM_new()) == NULL)

		return NULL;

	ret->get_issuer = 0;

	ret->check_issued = 0;

	ret->check_revocation = 0;

	ret->get_crl = 0;

	ret->check_crl = 0;

	ret->cert_crl = 0;

	ret->cleanup = 0;

	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE, ret, &ret->ex_data);

	ret->references=1;

	return ret;

	}

static void cleanup(X509_OBJECT *a)

	{

	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);

	}

EXPORT_C void X509_STORE_free(X509_STORE *vfy)

	{

	int i;

	STACK_OF(X509_LOOKUP) *sk;

	X509_LOOKUP *lu;

	if (vfy == NULL)

	    return;

	sk=vfy->get_cert_methods;

	for (i=0; i<sk_X509_LOOKUP_num(sk); i++)

		{

		lu=sk_X509_LOOKUP_value(sk,i);

		X509_LOOKUP_shutdown(lu);

		X509_LOOKUP_free(lu);

		}

	sk_X509_LOOKUP_free(sk);

	sk_X509_OBJECT_pop_free(vfy->objs, cleanup);

	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE, vfy, &vfy->ex_data);

	if (vfy->param)

		X509_VERIFY_PARAM_free(vfy->param);

	OPENSSL_free(vfy);

	}

EXPORT_C X509_LOOKUP *X509_STORE_add_lookup(X509_STORE *v, X509_LOOKUP_METHOD *m)

	{

	int 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;

			}

		}

	}

EXPORT_C 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,j;

	tmp=X509_OBJECT_retrieve_by_subject(ctx->objs,type,name);

	if (tmp == NULL)

		{

		for (i=vs->current_method; i<sk_X509_LOOKUP_num(ctx->get_cert_methods); i++)

			{

			lu=sk_X509_LOOKUP_value(ctx->get_cert_methods,i);

			j=X509_LOOKUP_by_subject(lu,type,name,&stmp);

			if (j < 0)

				{

				vs->current_method=j;

				return j;

				}

			else if (j)

				{

				tmp= &stmp;

				break;

				}

			}

		vs->current_method=0;

		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;

	}

EXPORT_C 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)

		{

		X509err(X509_F_X509_STORE_ADD_CERT,ERR_R_MALLOC_FAILURE);

		return 0;

		}

	obj->type=X509_LU_X509;

	obj->data.x509=x;

	CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);

	X509_OBJECT_up_ref_count(obj);

	if (X509_OBJECT_retrieve_match(ctx->objs, obj))

		{

		X509_OBJECT_free_contents(obj);

		OPENSSL_free(obj);

		X509err(X509_F_X509_STORE_ADD_CERT,X509_R_CERT_ALREADY_IN_HASH_TABLE);

		ret=0;

		} 

	else sk_X509_OBJECT_push(ctx->objs, obj);

	CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);

	return ret;

	}

EXPORT_C 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)

		{

		X509err(X509_F_X509_STORE_ADD_CRL,ERR_R_MALLOC_FAILURE);

		return 0;

		}

	obj->type=X509_LU_CRL;

	obj->data.crl=x;

	CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);

	X509_OBJECT_up_ref_count(obj);

	if (X509_OBJECT_retrieve_match(ctx->objs, obj))

		{

		X509_OBJECT_free_contents(obj);

		OPENSSL_free(obj);

		X509err(X509_F_X509_STORE_ADD_CRL,X509_R_CERT_ALREADY_IN_HASH_TABLE);

		ret=0;

		}

	else sk_X509_OBJECT_push(ctx->objs, obj);

	CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);

	return ret;

	}

EXPORT_C void X509_OBJECT_up_ref_count(X509_OBJECT *a)

	{

	switch (a->type)

		{

	case X509_LU_X509:

		CRYPTO_add(&a->data.x509->references,1,CRYPTO_LOCK_X509);

		break;

	case X509_LU_CRL:

		CRYPTO_add(&a->data.crl->references,1,CRYPTO_LOCK_X509_CRL);

		break;

		}

	}

EXPORT_C 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;

		}

	}

EXPORT_C int X509_OBJECT_idx_by_subject(STACK_OF(X509_OBJECT) *h, int type,

	     X509_NAME *name)

	{

	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;

		}

	return sk_X509_OBJECT_find(h,&stmp);

	}

EXPORT_C 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);

}

EXPORT_C X509_OBJECT *X509_OBJECT_retrieve_match(STACK_OF(X509_OBJECT) *h, X509_OBJECT *x)

{

	int idx, i;

	X509_OBJECT *obj;

	idx = sk_X509_OBJECT_find(h, x);

	if (idx == -1) return NULL;

	if (x->type != X509_LU_X509) 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) || !X509_cmp(obj->data.x509, x->data.x509))

			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.

 */

EXPORT_C int X509_STORE_CTX_get1_issuer(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)

{

	X509_NAME *xn;

	X509_OBJECT obj, *pobj;

	int i, ok, idx;

	xn=X509_get_issuer_name(x);

	ok=X509_STORE_get_by_subject(ctx,X509_LU_X509,xn,&obj);

	if (ok != X509_LU_X509)

		{

		if (ok == X509_LU_RETRY)

			{

			X509_OBJECT_free_contents(&obj);

			X509err(X509_F_X509_STORE_CTX_GET1_ISSUER,X509_R_SHOULD_RETRY);

			return -1;

			}

		else if (ok != X509_LU_FAIL)

			{

			X509_OBJECT_free_contents(&obj);

			/* not good :-(, break anyway */

			return -1;

			}

		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 matching cert */

	idx = X509_OBJECT_idx_by_subject(ctx->ctx->objs, X509_LU_X509, xn);

	/* This shouldn't normally happen since we already have one match */

	if (idx == -1) return 0;

	/* Look through all matching certificates for a 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 ran out of matches */

		if (pobj->type != X509_LU_X509) return 0;