text: /* 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>
  
  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 X509_LU_FAIL;
  	if (ctx->skip) return 0;
  	return ctx->method->get_by_subject(ctx,type,name,ret);
  	}
  
  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);
  	}
  
  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);
  	}
  
  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;
  	}
  
  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;
  
  	ret->purpose = 0;
  	ret->trust = 0;
  
  	ret->flags = 0;
  
  	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;
  	ret->depth=0;
  	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);
  	}
  
  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);
  	OPENSSL_free(vfy);
  	}
  
  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;
  			}
  		}
  	}
  
  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;
  	}
  
  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;
  	}
  
  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;
  	}
  
  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;
  		}
  	}
  
  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;
  		}
  	}
  
  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);
  	}
  
  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);
  }
  
  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.
   */
  
  
  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_VERIFY_CERT,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;
  		if (X509_NAME_cmp(xn, X509_get_subject_name(pobj->data.x509))) return 0;
  		if (ctx->check_issued(ctx, x, pobj->data.x509))
  			{
  			*issuer = pobj->data.x509;
  			X509_OBJECT_up_ref_count(pobj);
  			return 1;
  			}
  		}
  	return 0;
  }
  
  void X509_STORE_set_flags(X509_STORE *ctx, long flags)
  	{
  	ctx->flags |= flags;
  	}
  
  int X509_STORE_set_purpose(X509_STORE *ctx, int purpose)
  	{
  	return X509_PURPOSE_set(&ctx->purpose, purpose);
  	}
  
  int X509_STORE_set_trust(X509_STORE *ctx, int trust)
  	{
  	return X509_TRUST_set(&ctx->trust, trust);
  	}
  
  IMPLEMENT_STACK_OF(X509_LOOKUP)
  IMPLEMENT_STACK_OF(X509_OBJECT)
  