/* 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,
		STACK_OF(X509_CRL) *crls, ENGINE *e, int show_chain);
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;
	char *CApath=NULL,*CAfile=NULL;
	char *untfile = NULL, *trustfile = NULL, *crlfile = NULL;
	STACK_OF(X509) *untrusted = NULL, *trusted = NULL;
	STACK_OF(X509_CRL) *crls = NULL;
	X509_STORE *cert_ctx=NULL;
	X509_LOOKUP *lookup=NULL;
	X509_VERIFY_PARAM *vpm = NULL;
	int crl_download = 0, show_chain = 0;
#ifndef OPENSSL_NO_ENGINE
	char *engine=NULL;
#endif

	cert_ctx=X509_STORE_new();
	if (cert_ctx == NULL) goto end;
	X509_STORE_set_verify_cb(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);
				}
			else if (strcmp(*argv,"-CRLfile") == 0)
				{
				if (argc-- < 1) goto end;
				crlfile= *(++argv);
				}
			else if (strcmp(*argv,"-crl_download") == 0)
				crl_download = 1;
			else if (strcmp(*argv,"-show_chain") == 0)
				show_chain = 1;
#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)
		{
		untrusted = load_certs(bio_err, untfile, FORMAT_PEM,
					NULL, e, "untrusted certificates");
		if(!untrusted)
			goto end;
		}

	if(trustfile)
		{
		trusted = load_certs(bio_err, trustfile, FORMAT_PEM,
					NULL, e, "trusted certificates");
		if(!trusted)
			goto end;
		}

	if(crlfile)
		{
		crls = load_crls(bio_err, crlfile, FORMAT_PEM,
					NULL, e, "other CRLs");
		if(!crls)
			goto end;
		}

	if (crl_download)
		store_setup_crl_download(cert_ctx);

	ret=0;
	if (argc < 1)
		{ 
		if (1 != check(cert_ctx, NULL, untrusted, trusted, crls, e, show_chain))
			ret=-1;
		}
	else
		{
		for (i=0; i<argc; i++)
			if (1 != check(cert_ctx,argv[i], untrusted, trusted, crls, e, show_chain))
				ret=-1;
		}

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));
			}

		BIO_printf(bio_err,"recognized verify names:\n");
		for(i = 0; i < X509_VERIFY_PARAM_get_count(); i++)
			{
			const X509_VERIFY_PARAM *vptmp;
			vptmp = X509_VERIFY_PARAM_get0(i);
			BIO_printf(bio_err, "\t%-10s\n",
					X509_VERIFY_PARAM_get0_name(vptmp));
			}

	}
	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);
	sk_X509_CRL_pop_free(crls, X509_CRL_free);
	apps_shutdown();
	OPENSSL_EXIT(ret < 0 ? 2 : ret);
	}

static int check(X509_STORE *ctx, char *file,
		STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
		STACK_OF(X509_CRL) *crls, ENGINE *e, int show_chain)
	{
	X509 *x=NULL;
	int i=0,ret=0;
	X509_STORE_CTX *csc;
	STACK_OF(X509) *chain = NULL;

	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 (crls)
		X509_STORE_CTX_set0_crls(csc, crls);
	i=X509_verify_cert(csc);
	if (i > 0 && show_chain)
		chain = X509_STORE_CTX_get1_chain(csc);
	X509_STORE_CTX_free(csc);

	ret=0;
end:
	if (i > 0)
		{
		fprintf(stdout,"OK\n");
		ret=1;
		}
	else
		ERR_print_errors(bio_err);
	if (chain)
		{
		printf("Chain:\n");
		for (i = 0; i < sk_X509_num(chain); i++)
			{
			X509 *cert = sk_X509_value(chain, i);
			printf("depth=%d: ", i);
			X509_NAME_print_ex_fp(stdout,
				X509_get_subject_name(cert),
				0, XN_FLAG_ONELINE);
			printf("\n");
			}
		sk_X509_pop_free(chain, X509_free);
		}
	if (x != NULL) X509_free(x);

	return(ret);
	}

static int MS_CALLBACK cb(int ok, X509_STORE_CTX *ctx)
	{
	int cert_error = X509_STORE_CTX_get_error(ctx);
	X509 *current_cert = X509_STORE_CTX_get_current_cert(ctx);

	if (!ok)
		{
		if (current_cert)
			{
			X509_NAME_print_ex_fp(stdout,
				X509_get_subject_name(current_cert),
				0, XN_FLAG_ONELINE);
			printf("\n");
			}
		printf("%serror %d at %d depth lookup:%s\n",
			X509_STORE_CTX_get0_parent_ctx(ctx) ? "[CRL path]" : "",
			cert_error,
			X509_STORE_CTX_get_error_depth(ctx),
			X509_verify_cert_error_string(cert_error));
		switch(cert_error)
			{
			case X509_V_ERR_NO_EXPLICIT_POLICY:
				policies_print(NULL, ctx);
			case X509_V_ERR_CERT_HAS_EXPIRED:

			/* since we are just checking the certificates, it is
			 * ok if they are self signed. But we should still warn
			 * the user.
			 */

			case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
			/* Continue after extension errors too */
			case X509_V_ERR_INVALID_CA:
			case X509_V_ERR_INVALID_NON_CA:
			case X509_V_ERR_PATH_LENGTH_EXCEEDED:
			case X509_V_ERR_INVALID_PURPOSE:
			case X509_V_ERR_CRL_HAS_EXPIRED:
			case X509_V_ERR_CRL_NOT_YET_VALID:
			case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
			ok = 1;

			}

		return ok;

		}
	if (cert_error == X509_V_OK && ok == 2)
		policies_print(NULL, ctx);
	if (!v_verbose)
		ERR_clear_error();
	return(ok);
	}
