x509_vfy.h

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/* crypto/x509/x509_vfy.h */
/* Copyright (C) 1995-1998 Eric Young ([e-mail])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([e-mail]).
 * 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 ([e-mail]).
 * 
 * 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 ([e-mail])"
 *    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 ([e-mail])"
 * 
 * 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.]
 */

#ifndef HEADER_X509_H
#include <openssl/x509.h>
/* openssl/x509.h ends up #include-ing this file at about the only
 * appropriate moment. */
#endif

#ifndef HEADER_X509_VFY_H
#define HEADER_X509_VFY_H

#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_LHASH
#include <openssl/lhash.h>
#endif
#include <openssl/bio.h>
#include <openssl/crypto.h>
#include <openssl/symhacks.h>

#ifdef  __cplusplus
extern "C" {
#endif

/* Outer object */
typedef struct x509_hash_dir_st
	{
	int num_dirs;
	char **dirs;
	int *dirs_type;
	int num_dirs_alloced;
	} X509_HASH_DIR_CTX;

typedef struct x509_file_st
	{
	int num_paths;	/* number of paths to files or directories */
	int num_alloced;
	char **paths;	/* the list of paths or directories */
	int *path_type;
	} X509_CERT_FILE_CTX;

/*******************************/
/*
SSL_CTX -> X509_STORE    
		-> X509_LOOKUP
			->X509_LOOKUP_METHOD
		-> X509_LOOKUP
			->X509_LOOKUP_METHOD
 
SSL	-> X509_STORE_CTX
		->X509_STORE    

The X509_STORE holds the tables etc for verification stuff.
A X509_STORE_CTX is used while validating a single certificate.
The X509_STORE has X509_LOOKUPs for looking up certs.
The X509_STORE then calls a function to actually verify the
certificate chain.
*/

#define X509_LU_RETRY		-1
#define X509_LU_FAIL		0
#define X509_LU_X509		1
#define X509_LU_CRL		2
#define X509_LU_PKEY		3

typedef struct x509_object_st
	{
	/* one of the above types */
	int type;
	union	{
		char *ptr;
		X509 *x509;
		X509_CRL *crl;
		EVP_PKEY *pkey;
		} data;
	} X509_OBJECT;

typedef struct x509_lookup_st X509_LOOKUP;

DECLARE_STACK_OF(X509_LOOKUP)
DECLARE_STACK_OF(X509_OBJECT)

/* This is a static that defines the function interface */
typedef struct x509_lookup_method_st
	{
	const char *name;
	int (*new_item)(X509_LOOKUP *ctx);
	void (*free)(X509_LOOKUP *ctx);
	int (*init)(X509_LOOKUP *ctx);
	int (*shutdown)(X509_LOOKUP *ctx);
	int (*ctrl)(X509_LOOKUP *ctx,int cmd,const char *argc,long argl,
			char **ret);
	int (*get_by_subject)(X509_LOOKUP *ctx,int type,X509_NAME *name,
			      X509_OBJECT *ret);
	int (*get_by_issuer_serial)(X509_LOOKUP *ctx,int type,X509_NAME *name,
				    ASN1_INTEGER *serial,X509_OBJECT *ret);
	int (*get_by_fingerprint)(X509_LOOKUP *ctx,int type,
				  unsigned char *bytes,int len,
				  X509_OBJECT *ret);
	int (*get_by_alias)(X509_LOOKUP *ctx,int type,char *str,int len,
			    X509_OBJECT *ret);
	} X509_LOOKUP_METHOD;

/* This structure hold all parameters associated with a verify operation
 * by including an X509_VERIFY_PARAM structure in related structures the
 * parameters used can be customized
 */

typedef struct X509_VERIFY_PARAM_st
	{
	char *name;
	time_t check_time;	/* Time to use */
	unsigned long inh_flags; /* Inheritance flags */
	unsigned long flags;	/* Various verify flags */
	int purpose;		/* purpose to check untrusted certificates */
	int trust;		/* trust setting to check */
	int depth;		/* Verify depth */
	STACK_OF(ASN1_OBJECT) *policies;	/* Permissible policies */
	} X509_VERIFY_PARAM;

DECLARE_STACK_OF(X509_VERIFY_PARAM)

/* This is used to hold everything.  It is used for all certificate
 * validation.  Once we have a certificate chain, the 'verify'
 * function is then called to actually check the cert chain. */
struct x509_store_st
	{
	/* The following is a cache of trusted certs */
	int cache; 	/* if true, stash any hits */
	STACK_OF(X509_OBJECT) *objs;	/* Cache of all objects */

	/* These are external lookup methods */
	STACK_OF(X509_LOOKUP) *get_cert_methods;

	X509_VERIFY_PARAM *param;

	/* Callbacks for various operations */
	int (*verify)(X509_STORE_CTX *ctx);	/* called to verify a certificate */
	int (*verify_cb)(int ok,X509_STORE_CTX *ctx);	/* error callback */
	int (*get_issuer)(X509 **issuer, X509_STORE_CTX *ctx, X509 *x);	/* get issuers cert from ctx */
	int (*check_issued)(X509_STORE_CTX *ctx, X509 *x, X509 *issuer); /* check issued */
	int (*check_revocation)(X509_STORE_CTX *ctx); /* Check revocation status of chain */
	int (*get_crl)(X509_STORE_CTX *ctx, X509_CRL **crl, X509 *x); /* retrieve CRL */
	int (*check_crl)(X509_STORE_CTX *ctx, X509_CRL *crl); /* Check CRL validity */
	int (*cert_crl)(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x); /* Check certificate against CRL */
	int (*cleanup)(X509_STORE_CTX *ctx);

	CRYPTO_EX_DATA ex_data;
	int references;
	} /* X509_STORE */;

int X509_STORE_set_depth(X509_STORE *store, int depth);

#define X509_STORE_set_verify_cb_func(ctx,func) ((ctx)->verify_cb=(func))
#define X509_STORE_set_verify_func(ctx,func)	((ctx)->verify=(func))

/* This is the functions plus an instance of the local variables. */
struct x509_lookup_st
	{
	int init;			/* have we been started */
	int skip;			/* don't use us. */
	X509_LOOKUP_METHOD *method;	/* the functions */
	char *method_data;		/* method data */

	X509_STORE *store_ctx;	/* who owns us */
	} /* X509_LOOKUP */;

/* This is a used when verifying cert chains.  Since the
 * gathering of the cert chain can take some time (and have to be
 * 'retried', this needs to be kept and passed around. */
struct x509_store_ctx_st      /* X509_STORE_CTX */
	{
	X509_STORE *ctx;
	int current_method;	/* used when looking up certs */

	/* The following are set by the caller */
	X509 *cert;		/* The cert to check */
	STACK_OF(X509) *untrusted;	/* chain of X509s - untrusted - passed in */
	STACK_OF(X509_CRL) *crls;	/* set of CRLs passed in */

	X509_VERIFY_PARAM *param;
	void *other_ctx;	/* Other info for use with get_issuer() */

	/* Callbacks for various operations */
	int (*verify)(X509_STORE_CTX *ctx);	/* called to verify a certificate */
	int (*verify_cb)(int ok,X509_STORE_CTX *ctx);		/* error callback */
	int (*get_issuer)(X509 **issuer, X509_STORE_CTX *ctx, X509 *x);	/* get issuers cert from ctx */
	int (*check_issued)(X509_STORE_CTX *ctx, X509 *x, X509 *issuer); /* check issued */
	int (*check_revocation)(X509_STORE_CTX *ctx); /* Check revocation status of chain */
	int (*get_crl)(X509_STORE_CTX *ctx, X509_CRL **crl, X509 *x); /* retrieve CRL */
	int (*check_crl)(X509_STORE_CTX *ctx, X509_CRL *crl); /* Check CRL validity */
	int (*cert_crl)(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x); /* Check certificate against CRL */
	int (*check_policy)(X509_STORE_CTX *ctx);
	int (*cleanup)(X509_STORE_CTX *ctx);

	/* The following is built up */
	int valid;		/* if 0, rebuild chain */
	int last_untrusted;	/* index of last untrusted cert */
	STACK_OF(X509) *chain; 		/* chain of X509s - built up and trusted */
	X509_POLICY_TREE *tree;	/* Valid policy tree */

	int explicit_policy;	/* Require explicit policy value */

	/* When something goes wrong, this is why */
	int error_depth;
	int error;
	X509 *current_cert;
	X509 *current_issuer;	/* cert currently being tested as valid issuer */
	X509_CRL *current_crl;	/* current CRL */

	CRYPTO_EX_DATA ex_data;