/* apps/crl.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	crl_main

#undef POSTFIX
#define	POSTFIX	".rvk"

static const char *crl_usage[]={
"usage: crl args\n",
"\n",
" -inform arg     - input format - default PEM (DER or PEM)\n",
" -outform arg    - output format - default PEM\n",
" -text           - print out a text format version\n",
" -in arg         - input file - default stdin\n",
" -out arg        - output file - default stdout\n",
" -hash           - print hash value\n",
" -fingerprint    - print the crl fingerprint\n",
" -issuer         - print issuer DN\n",
" -lastupdate     - lastUpdate field\n",
" -nextupdate     - nextUpdate field\n",
" -crlnumber      - print CRL number\n",
" -noout          - no CRL output\n",
" -CAfile  name   - verify CRL using certificates in file \"name\"\n",
" -CApath  dir    - verify CRL using certificates in \"dir\"\n",
" -nameopt arg    - various certificate name options\n",
NULL
};

static BIO *bio_out=NULL;

int MAIN(int, char **);

int MAIN(int argc, char **argv)
	{
	unsigned long nmflag = 0;
	X509_CRL *x=NULL;
	char *CAfile = NULL, *CApath = NULL;
	int ret=1,i,num,badops=0,badsig=0;
	BIO *out=NULL;
	int informat,outformat, keyformat;
	char *infile=NULL,*outfile=NULL, *crldiff = NULL, *keyfile = NULL;
	int hash=0,issuer=0,lastupdate=0,nextupdate=0,noout=0,text=0;
	int fingerprint = 0, crlnumber = 0;
	const char **pp;
	X509_STORE *store = NULL;
	X509_STORE_CTX ctx;
	X509_LOOKUP *lookup = NULL;
	X509_OBJECT xobj;
	EVP_PKEY *pkey;
	int do_ver = 0;
	const EVP_MD *md_alg,*digest=EVP_sha1();

	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;

	if (bio_out == NULL)
		if ((bio_out=BIO_new(BIO_s_file())) != NULL)
			{
			BIO_set_fp(bio_out,stdout,BIO_NOCLOSE);
#ifdef OPENSSL_SYS_VMS
			{
			BIO *tmpbio = BIO_new(BIO_f_linebuffer());
			bio_out = BIO_push(tmpbio, bio_out);
			}
#endif
			}

	informat=FORMAT_PEM;
	outformat=FORMAT_PEM;
	keyformat=FORMAT_PEM;

	argc--;
	argv++;
	num=0;
	while (argc >= 1)
		{
#ifdef undef
		if	(strcmp(*argv,"-p") == 0)
			{
			if (--argc < 1) goto bad;
			if (!args_from_file(++argv,Nargc,Nargv)) { goto end; }*/
			}
#endif
		if 	(strcmp(*argv,"-inform") == 0)
			{
			if (--argc < 1) goto bad;
			informat=str2fmt(*(++argv));
			}
		else if (strcmp(*argv,"-outform") == 0)
			{
			if (--argc < 1) goto bad;
			outformat=str2fmt(*(++argv));
			}
		else if (strcmp(*argv,"-in") == 0)
			{
			if (--argc < 1) goto bad;
			infile= *(++argv);
			}
		else if (strcmp(*argv,"-gendelta") == 0)
			{
			if (--argc < 1) goto bad;
			crldiff= *(++argv);
			}
		else if (strcmp(*argv,"-key") == 0)
			{
			if (--argc < 1) goto bad;
			keyfile= *(++argv);
			}
		else if (strcmp(*argv,"-keyform") == 0)
			{
			if (--argc < 1) goto bad;
			keyformat=str2fmt(*(++argv));
			}
		else if (strcmp(*argv,"-out") == 0)
			{
			if (--argc < 1) goto bad;
			outfile= *(++argv);
			}
		else if (strcmp(*argv,"-CApath") == 0)
			{
			if (--argc < 1) goto bad;
			CApath = *(++argv);
			do_ver = 1;
			}
		else if (strcmp(*argv,"-CAfile") == 0)
			{
			if (--argc < 1) goto bad;
			CAfile = *(++argv);
			do_ver = 1;
			}
		else if (strcmp(*argv,"-verify") == 0)
			do_ver = 1;
		else if (strcmp(*argv,"-text") == 0)
			text = 1;
		else if (strcmp(*argv,"-hash") == 0)
			hash= ++num;
		else if (strcmp(*argv,"-nameopt") == 0)
			{
			if (--argc < 1) goto bad;
			if (!set_name_ex(&nmflag, *(++argv))) goto bad;
			}
		else if (strcmp(*argv,"-issuer") == 0)
			issuer= ++num;
		else if (strcmp(*argv,"-lastupdate") == 0)
			lastupdate= ++num;
		else if (strcmp(*argv,"-nextupdate") == 0)
			nextupdate= ++num;
		else if (strcmp(*argv,"-noout") == 0)
			noout= ++num;
		else if (strcmp(*argv,"-fingerprint") == 0)
			fingerprint= ++num;
		else if (strcmp(*argv,"-crlnumber") == 0)
			crlnumber= ++num;
		else if (strcmp(*argv,"-badsig") == 0)
			badsig = 1;
		else if ((md_alg=EVP_get_digestbyname(*argv + 1)))
			{
			/* ok */
			digest=md_alg;
			}
		else
			{
			BIO_printf(bio_err,"unknown option %s\n",*argv);
			badops=1;
			break;
			}
		argc--;
		argv++;
		}

	if (badops)
		{
bad:
		for (pp=crl_usage; (*pp != NULL); pp++)
			BIO_printf(bio_err,"%s",*pp);
		goto end;
		}

	ERR_load_crypto_strings();
	x=load_crl(infile,informat);
	if (x == NULL) { goto end; }

	if(do_ver) {
		store = X509_STORE_new();
		lookup=X509_STORE_add_lookup(store,X509_LOOKUP_file());
		if (lookup == NULL) goto end;
		if (!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM))
			X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
			
		lookup=X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
		if (lookup == NULL) goto end;
		if (!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM))
			X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
		ERR_clear_error();

		if(!X509_STORE_CTX_init(&ctx, store, NULL, NULL)) {
			BIO_printf(bio_err,
				"Error initialising X509 store\n");
			goto end;
		}

		i = X509_STORE_get_by_subject(&ctx, X509_LU_X509, 
					X509_CRL_get_issuer(x), &xobj);
		if(i <= 0) {
			BIO_printf(bio_err,
				"Error getting CRL issuer certificate\n");
			goto end;
		}
		pkey = X509_get_pubkey(xobj.data.x509);
		X509_OBJECT_free_contents(&xobj);
		if(!pkey) {
			BIO_printf(bio_err,
				"Error getting CRL issuer public key\n");
			goto end;
		}
		i = X509_CRL_verify(x, pkey);
		EVP_PKEY_free(pkey);
		if(i < 0) goto end;
		if(i == 0) BIO_printf(bio_err, "verify failure\n");
		else BIO_printf(bio_err, "verify OK\n");
	}

	if (crldiff)
		{
		X509_CRL *newcrl, *delta;
		if (!keyfile)
			{
			BIO_puts(bio_err, "Missing CRL signing key\n");
			goto end;
			}
		newcrl = load_crl(crldiff,informat);
		if (!newcrl)
			goto end;
		pkey = load_key(bio_err, keyfile, keyformat, 0, NULL, NULL,
					"CRL signing key");
		if (!pkey)
			{
			X509_CRL_free(newcrl);
			goto end;
			}	
		delta = X509_CRL_diff(x, newcrl, pkey, digest, 0);
		X509_CRL_free(newcrl);
		EVP_PKEY_free(pkey);
		if (delta)
			{
			X509_CRL_free(x);
			x = delta;
			}
		else
			{
			BIO_puts(bio_err, "Error creating delta CRL\n");
			goto end;
			}
		}

	if (num)
		{
		for (i=1; i<=num; i++)
			{
			if (issuer == i)
				{
				print_name(bio_out, "issuer=", X509_CRL_get_issuer(x), nmflag);
				}
			if (crlnumber == i)
				{
				ASN1_INTEGER *crlnum;
				crlnum = X509_CRL_get_ext_d2i(x, NID_crl_number,
							      NULL, NULL);
				BIO_printf(bio_out,"crlNumber=");
				if (crlnum)
					{
					i2a_ASN1_INTEGER(bio_out, crlnum);
					ASN1_INTEGER_free(crlnum);
					}
				else
					BIO_puts(bio_out, "<NONE>");
				BIO_printf(bio_out,"\n");
				}
			if (hash == i)
				{
				BIO_printf(bio_out,"%08lx\n",
					X509_NAME_hash(X509_CRL_get_issuer(x)));
				}
			if (lastupdate == i)
				{
				BIO_printf(bio_out,"lastUpdate=");
				ASN1_TIME_print(bio_out,
						X509_CRL_get_lastUpdate(x));
				BIO_printf(bio_out,"\n");
				}
			if (nextupdate == i)
				{
				BIO_printf(bio_out,"nextUpdate=");
				if (X509_CRL_get_nextUpdate(x)) 
					ASN1_TIME_print(bio_out,
						X509_CRL_get_nextUpdate(x));
				else
					BIO_printf(bio_out,"NONE");
				BIO_printf(bio_out,"\n");
				}
			if (fingerprint == i)
				{
				int j;
				unsigned int n;
				unsigned char md[EVP_MAX_MD_SIZE];

				if (!X509_CRL_digest(x,digest,md,&n))
					{
					BIO_printf(bio_err,"out of memory\n");
					goto end;
					}
				BIO_printf(bio_out,"%s Fingerprint=",
						OBJ_nid2sn(EVP_MD_type(digest)));
				for (j=0; j<(int)n; j++)
					{
					BIO_printf(bio_out,"%02X%c",md[j],
						(j+1 == (int)n)
						?'\n':':');
					}
				}
			}
		}

	out=BIO_new(BIO_s_file());
	if (out == NULL)
		{
		ERR_print_errors(bio_err);
		goto end;
		}

	if (outfile == NULL)
		{
		BIO_set_fp(out,stdout,BIO_NOCLOSE);
#ifdef OPENSSL_SYS_VMS
		{
		BIO *tmpbio = BIO_new(BIO_f_linebuffer());
		out = BIO_push(tmpbio, out);
		}
#endif
		}
	else
		{
		if (BIO_write_filename(out,outfile) <= 0)
			{
			perror(outfile);
			goto end;
			}
		}

	if (text) X509_CRL_print(out, x);

	if (noout) 
		{
		ret = 0;
		goto end;
		}

	if (badsig)
		x->signature->data[x->signature->length - 1] ^= 0x1;

	if 	(outformat == FORMAT_ASN1)
		i=(int)i2d_X509_CRL_bio(out,x);
	else if (outformat == FORMAT_PEM)
		i=PEM_write_bio_X509_CRL(out,x);
	else	
		{
		BIO_printf(bio_err,"bad output format specified for outfile\n");
		goto end;
		}
	if (!i) { BIO_printf(bio_err,"unable to write CRL\n"); goto end; }
	ret=0;
end:
	if (ret != 0)
		ERR_print_errors(bio_err);
	BIO_free_all(out);
	BIO_free_all(bio_out);
	bio_out=NULL;
	X509_CRL_free(x);
	if(store) {
		X509_STORE_CTX_cleanup(&ctx);
		X509_STORE_free(store);
	}
	apps_shutdown();
	OPENSSL_EXIT(ret);
	}