/* crypto/pkcs7/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 <openssl/bio.h>

 #include <openssl/x509.h>

 #include <openssl/pem.h>

 #include <openssl/err.h>

 #include <openssl/asn1.h>

 int verify_callback(int ok, X509_STORE_CTX *ctx);

 BIO *bio_err=NULL;

 int main(argc,argv)

 int argc;

 char *argv[];

 	{

 	char *keyfile=NULL;

 	BIO *in;

 	EVP_PKEY *pkey;

 	X509 *x509;

 	PKCS7 *p7;

 	PKCS7_SIGNER_INFO *si;

 	X509_STORE_CTX cert_ctx;

 	X509_STORE *cert_store=NULL;

 	BIO *data,*detached=NULL,*p7bio=NULL;

 	char buf[1024*4];

 	unsigned char *pp;

 	int i,printit=0;

 	STACK_OF(PKCS7_SIGNER_INFO) *sk;

 	OpenSSL_add_all_algorithms();

 	bio_err=BIO_new_fp(stderr,BIO_NOCLOSE);

 	data=BIO_new(BIO_s_file());

 	pp=NULL;

 	while (argc > 1)

 		{

 		argc--;

 		argv++;

 		if (strcmp(argv[0],"-p") == 0)

 			{

 			printit=1;

 			}

 		else if ((strcmp(argv[0],"-k") == 0) && (argc >= 2)) {

 			keyfile = argv[1];

 			argc-=1;

 			argv+=1;

 		} else if ((strcmp(argv[0],"-d") == 0) && (argc >= 2))

 			{

 			detached=BIO_new(BIO_s_file());

 			if (!BIO_read_filename(detached,argv[1]))

 				goto err;

 			argc-=1;

 			argv+=1;

 			}

 		else break;

 		}

 	 if (!BIO_read_filename(data,argv[0])) goto err; 

 	if(!keyfile) {

 		fprintf(stderr, "No private key file specified\n");

 		goto err;

 	}

         if ((in=BIO_new_file(keyfile,"r")) == NULL) goto err;

         if ((x509=PEM_read_bio_X509(in,NULL,NULL,NULL)) == NULL) goto err;

         BIO_reset(in);

         if ((pkey=PEM_read_bio_PrivateKey(in,NULL,NULL,NULL)) == NULL)

 		goto err;

         BIO_free(in);

 	if (pp == NULL)

 		BIO_set_fp(data,stdin,BIO_NOCLOSE);

 	/* Load the PKCS7 object from a file */

 	if ((p7=PEM_read_bio_PKCS7(data,NULL,NULL,NULL)) == NULL) goto err;

 	/* This stuff is being setup for certificate verification.

 	 * When using SSL, it could be replaced with a 

 	 * cert_stre=SSL_CTX_get_cert_store(ssl_ctx); */

 	cert_store=X509_STORE_new();

 	X509_STORE_set_default_paths(cert_store);

 	X509_STORE_load_locations(cert_store,NULL,"../../certs");

 	X509_STORE_set_verify_cb_func(cert_store,verify_callback);

 	ERR_clear_error();

 	/* We need to process the data */

 	/* We cannot support detached encryption */

 	p7bio=PKCS7_dataDecode(p7,pkey,detached,x509);

 	if (p7bio == NULL)

 		{

 		printf("problems decoding\n");

 		goto err;

 		}

 	/* We now have to 'read' from p7bio to calculate digests etc. */

 	for (;;)

 		{

 		i=BIO_read(p7bio,buf,sizeof(buf));

 		/* print it? */

 		if (i <= 0) break;

 		fwrite(buf,1, i, stdout);

 		}

 	/* We can now verify signatures */

 	sk=PKCS7_get_signer_info(p7);

 	if (sk == NULL)

 		{

 		fprintf(stderr, "there are no signatures on this data\n");

 		}

 	else

 		{

 		/* Ok, first we need to, for each subject entry,

 		 * see if we can verify */

 		ERR_clear_error();

 		for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sk); i++)

 			{

 			si=sk_PKCS7_SIGNER_INFO_value(sk,i);

 			i=PKCS7_dataVerify(cert_store,&cert_ctx,p7bio,p7,si);

 			if (i <= 0)

 				goto err;

 			else

 				fprintf(stderr,"Signature verified\n");

 			}

 		}

 	X509_STORE_free(cert_store);

 	exit(0);

 err:

 	ERR_load_crypto_strings();

 	ERR_print_errors_fp(stderr);

 	exit(1);

 	}

 /* should be X509 * but we can just have them as char *. */

 int verify_callback(int ok, X509_STORE_CTX *ctx)

 	{

 	char buf[256];

 	X509 *err_cert;

 	int err,depth;

 	err_cert=X509_STORE_CTX_get_current_cert(ctx);

 	err=	X509_STORE_CTX_get_error(ctx);

 	depth=	X509_STORE_CTX_get_error_depth(ctx);

 	X509_NAME_oneline(X509_get_subject_name(err_cert),buf,256);

 	BIO_printf(bio_err,"depth=%d %s\n",depth,buf);

 	if (!ok)

 		{

 		BIO_printf(bio_err,"verify error:num=%d:%s\n",err,

 			X509_verify_cert_error_string(err));

 		if (depth < 6)

 			{

 			ok=1;

 			X509_STORE_CTX_set_error(ctx,X509_V_OK);

 			}

 		else

 			{

 			ok=0;

 			X509_STORE_CTX_set_error(ctx,X509_V_ERR_CERT_CHAIN_TOO_LONG);

 			}

 		}

 	switch (ctx->error)

 		{

 	case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:

 		X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert),buf,256);

 		BIO_printf(bio_err,"issuer= %s\n",buf);

 		break;

 	case X509_V_ERR_CERT_NOT_YET_VALID:

 	case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:

 		BIO_printf(bio_err,"notBefore=");

 		ASN1_UTCTIME_print(bio_err,X509_get_notBefore(ctx->current_cert));

 		BIO_printf(bio_err,"\n");

 		break;

 	case X509_V_ERR_CERT_HAS_EXPIRED:

 	case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:

 		BIO_printf(bio_err,"notAfter=");

 		ASN1_UTCTIME_print(bio_err,X509_get_notAfter(ctx->current_cert));

 		BIO_printf(bio_err,"\n");

 		break;

 		}

 	BIO_printf(bio_err,"verify return:%d\n",ok);

 	return(ok);

 	}