/* apps/verify.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 <stdlib.h>

#include <string.h>

#include "apps.h"

#include <openssl/bio.h>

#include <openssl/err.h>

#include <openssl/x509.h>

#include <openssl/x509v3.h>

#include <openssl/pem.h>

#undef PROG

#define PROG	verify_main

static int MS_CALLBACK cb(int ok, X509_STORE_CTX *ctx);

static int check(X509_STORE *ctx, char *file, STACK_OF(X509) *uchain, STACK_OF(X509) *tchain, int purpose, ENGINE *e);

static STACK_OF(X509) *load_untrusted(char *file);

static int v_verbose=0, vflags = 0;

int MAIN(int, char **);

int MAIN(int argc, char **argv)

	{

	ENGINE *e = NULL;

	int i,ret=1, badarg = 0;

	int purpose = -1;

	char *CApath=NULL,*CAfile=NULL;

	char *untfile = NULL, *trustfile = NULL;

	STACK_OF(X509) *untrusted = NULL, *trusted = NULL;

	X509_STORE *cert_ctx=NULL;

	X509_LOOKUP *lookup=NULL;

	X509_VERIFY_PARAM *vpm = NULL;

#ifndef OPENSSL_NO_ENGINE

	char *engine=NULL;

#endif

	cert_ctx=X509_STORE_new();

	if (cert_ctx == NULL) goto end;

	X509_STORE_set_verify_cb_func(cert_ctx,cb);

	ERR_load_crypto_strings();

	apps_startup();

	if (bio_err == NULL)

		if ((bio_err=BIO_new(BIO_s_file())) != NULL)

			BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);

	if (!load_config(bio_err, NULL))

		goto end;

	argc--;

	argv++;

	for (;;)

		{

		if (argc >= 1)

			{

			if (strcmp(*argv,"-CApath") == 0)

				{

				if (argc-- < 1) goto end;

				CApath= *(++argv);

				}

			else if (strcmp(*argv,"-CAfile") == 0)

				{

				if (argc-- < 1) goto end;

				CAfile= *(++argv);

				}

			else if (args_verify(&argv, &argc, &badarg, bio_err,

									&vpm))

				{

				if (badarg)

					goto end;

				continue;

				}

			else if (strcmp(*argv,"-untrusted") == 0)

				{

				if (argc-- < 1) goto end;

				untfile= *(++argv);

				}

			else if (strcmp(*argv,"-trusted") == 0)

				{

				if (argc-- < 1) goto end;

				trustfile= *(++argv);

				}

#ifndef OPENSSL_NO_ENGINE

			else if (strcmp(*argv,"-engine") == 0)

				{

				if (--argc < 1) goto end;

				engine= *(++argv);

				}

#endif

			else if (strcmp(*argv,"-help") == 0)

				goto end;

			else if (strcmp(*argv,"-verbose") == 0)

				v_verbose=1;

			else if (argv[0][0] == '-')

				goto end;

			else

				break;

			argc--;

			argv++;

			}

		else

			break;

		}

#ifndef OPENSSL_NO_ENGINE

        e = setup_engine(bio_err, engine, 0);

#endif

	if (vpm)

		X509_STORE_set1_param(cert_ctx, vpm);

	lookup=X509_STORE_add_lookup(cert_ctx,X509_LOOKUP_file());

	if (lookup == NULL) abort();

	if (CAfile) {

		i=X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM);

		if(!i) {

			BIO_printf(bio_err, "Error loading file %s\n", CAfile);

			ERR_print_errors(bio_err);

			goto end;

		}

	} else X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);

	lookup=X509_STORE_add_lookup(cert_ctx,X509_LOOKUP_hash_dir());

	if (lookup == NULL) abort();

	if (CApath) {

		i=X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM);

		if(!i) {

			BIO_printf(bio_err, "Error loading directory %s\n", CApath);

			ERR_print_errors(bio_err);

			goto end;

		}

	} else X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);

	ERR_clear_error();

	if(untfile) {

		if(!(untrusted = load_untrusted(untfile))) {

			BIO_printf(bio_err, "Error loading untrusted file %s\n", untfile);

			ERR_print_errors(bio_err);

			goto end;

		}

	}

	if(trustfile) {

		if(!(trusted = load_untrusted(trustfile))) {

			BIO_printf(bio_err, "Error loading untrusted file %s\n", trustfile);

			ERR_print_errors(bio_err);

			goto end;

		}

	}

	if (argc < 1) check(cert_ctx, NULL, untrusted, trusted, purpose, e);

	else

		for (i=0; i<argc; i++)

			check(cert_ctx,argv[i], untrusted, trusted, purpose, e);

	ret=0;

end:

	if (ret == 1) {

		BIO_printf(bio_err,"usage: verify [-verbose] [-CApath path] [-CAfile file] [-purpose purpose] [-crl_check]");

#ifndef OPENSSL_NO_ENGINE

		BIO_printf(bio_err," [-engine e]");

#endif

		BIO_printf(bio_err," cert1 cert2 ...\n");

		BIO_printf(bio_err,"recognized usages:\n");

		for(i = 0; i < X509_PURPOSE_get_count(); i++) {

			X509_PURPOSE *ptmp;

			ptmp = X509_PURPOSE_get0(i);

			BIO_printf(bio_err, "\t%-10s\t%s\n", X509_PURPOSE_get0_sname(ptmp),

								X509_PURPOSE_get0_name(ptmp));

		}

	}

	if (vpm) X509_VERIFY_PARAM_free(vpm);

	if (cert_ctx != NULL) X509_STORE_free(cert_ctx);

	sk_X509_pop_free(untrusted, X509_free);

	sk_X509_pop_free(trusted, X509_free);

	apps_shutdown();

	OPENSSL_EXIT(ret);

	}

static int check(X509_STORE *ctx, char *file, STACK_OF(X509) *uchain, STACK_OF(X509) *tchain, int purpose, ENGINE *e)

	{

	X509 *x=NULL;

	int i=0,ret=0;

	X509_STORE_CTX *csc;

	x = load_cert(bio_err, file, FORMAT_PEM, NULL, e, "certificate file");

	if (x == NULL)

		goto end;

	fprintf(stdout,"%s: ",(file == NULL)?"stdin":file);

	csc = X509_STORE_CTX_new();

	if (csc == NULL)

		{

		ERR_print_errors(bio_err);

		goto end;

		}

	X509_STORE_set_flags(ctx, vflags);

	if(!X509_STORE_CTX_init(csc,ctx,x,uchain))

		{

		ERR_print_errors(bio_err);

		goto end;

		}

	if(tchain) X509_STORE_CTX_trusted_stack(csc, tchain);

	if(purpose >= 0) X509_STORE_CTX_set_purpose(csc, purpose);

	i=X509_verify_cert(csc);

	X509_STORE_CTX_free(csc);

	ret=0;

end:

	if (i)

		{

		fprintf(stdout,"OK\n");

  	ret=1;

		}

	else

		ERR_print_errors(bio_err);

	if (x != NULL) X509_free(x);

	return(ret);

	}

static STACK_OF(X509) *load_untrusted(char *certfile)

{

	STACK_OF(X509_INFO) *sk=NULL;

	STACK_OF(X509) *stack=NULL, *ret=NULL;

	BIO *in=NULL;

	X509_INFO *xi;

	if(!(stack = sk_X509_new_null())) {

		BIO_printf(bio_err,"memory allocation failure\n");

		goto end;

	}

	if(!(in=BIO_new_file(certfile, "r"))) {

		BIO_printf(bio_err,"error opening the file, %s\n",certfile);

		goto end;

	}

	/* This loads from a file, a stack of x509/crl/pkey sets */

	if(!(sk=PEM_X509_INFO_read_bio(in,NULL,NULL,NULL))) {

		BIO_printf(bio_err,"error reading the file, %s\n",certfile);

		goto end;

	}

	/* scan over it and pull out the certs */

	while (sk_X509_INFO_num(sk))

		{

		xi=sk_X509_INFO_shift(sk);

		if (xi->x509 != NULL)

			{

			sk_X509_push(stack,xi->x509);

			xi->x509=NULL;

			}

		X509_INFO_free(xi);

		}

	if(!sk_X509_num(stack)) {

		BIO_printf(bio_err,"no certificates in file, %s\n",certfile);

		sk_X509_free(stack);

		goto end;

	}

	ret=stack;

end:

	BIO_free(in);

	sk_X509_INFO_free(sk);

	return(ret);

	}

static int MS_CALLBACK cb(int ok, X509_STORE_CTX *ctx)

	{

	char buf[256];

	if (!ok)

		{

		if (ctx->current_cert)

			{

			X509_NAME_oneline(

				X509_get_subject_name(ctx->current_cert),buf,

				sizeof buf);

			printf("%s\n",buf);

			}

		printf("error %d at %d depth lookup:%s\n",ctx->error,

			ctx->error_depth,

			X509_verify_cert_error_string(ctx->error));

		if (ctx->error == X509_V_ERR_CERT_HAS_EXPIRED) ok=1;

		/* since we are just checking the certificates, it is

		 * ok if they are self signed. But we should still warn

		 * the user.

 		 */

		if (ctx->error == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT) ok=1;

		/* Continue after extension errors too */

		if (ctx->error == X509_V_ERR_INVALID_CA) ok=1;

		if (ctx->error == X509_V_ERR_INVALID_NON_CA) ok=1;

		if (ctx->error == X509_V_ERR_PATH_LENGTH_EXCEEDED) ok=1;

		if (ctx->error == X509_V_ERR_INVALID_PURPOSE) ok=1;

		if (ctx->error == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT) ok=1;

		if (ctx->error == X509_V_ERR_CRL_HAS_EXPIRED) ok=1;

		if (ctx->error == X509_V_ERR_CRL_NOT_YET_VALID) ok=1;

		if (ctx->error == X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION) ok=1;

		if (ctx->error == X509_V_ERR_NO_EXPLICIT_POLICY)

			policies_print(NULL, ctx);

		return ok;

		}

	if ((ctx->error == X509_V_OK) && (ok == 2))

		policies_print(NULL, ctx);

	if (!v_verbose)

		ERR_clear_error();

	return(ok);

	}