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/* verify.c - verify signed data
* Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <gcrypt.h>
#include "options.h"
#include "packet.h"
#include "errors.h"
#include "iobuf.h"
#include "keydb.h"
#include "util.h"
#include "main.h"
#include "status.h"
#include "filter.h"
#include "ttyio.h"
#include "i18n.h"
/****************
* Assume that the input is a signature and verify it without
* generating any output. With no arguments, the signature packet
* is read from stdin (it may be a detached signature when not
* used in batch mode). If only a sigfile is given, it may be a complete
* signature or a detached signature in which case the signed stuff
* is expected from stdin. With more than 1 argument, the first should
* be a detached signature and the remaining files are the signed stuff.
*/
int
verify_signatures( int nfiles, char **files )
{
IOBUF fp;
armor_filter_context_t afx;
const char *sigfile;
int i, rc;
STRLIST sl;
memset( &afx, 0, sizeof afx);
sigfile = nfiles? *files : NULL;
/* open the signature file */
fp = iobuf_open(sigfile);
if( !fp ) {
log_error(_("can't open `%s'\n"), print_fname_stdin(sigfile));
return GPGERR_OPEN_FILE;
}
if( !opt.no_armor && use_armor_filter( fp ) )
iobuf_push_filter( fp, armor_filter, &afx );
sl = NULL;
for(i=1 ; i < nfiles; i++ )
add_to_strlist( &sl, files[i] );
rc = proc_signature_packets( NULL, fp, sl, sigfile );
free_strlist(sl);
iobuf_close(fp);
if( afx.no_openpgp_data && rc == -1 ) {
log_error(_("the signature could not be verified.\n"
"Please remember that the signature file (.sig or .asc)\n"
"should be the first file given on the command line.\n") );
rc = 0;
}
return rc;
}
static void
print_file_status( int status, const char *name, int what )
{
char *p = gcry_xmalloc(strlen(name)+10);
sprintf(p, "%d %s", what, name );
write_status_text( status, p );
gcry_free(p);
}
static int
verify_one_file( const char *name )
{
IOBUF fp;
armor_filter_context_t afx;
int rc;
print_file_status( STATUS_FILE_START, name, 1 );
fp = iobuf_open(name);
if( !fp ) {
print_file_status( STATUS_FILE_ERROR, name, 1 );
log_error(_("can't open `%s'\n"), print_fname_stdin(name));
return GPGERR_OPEN_FILE;
}
if( !opt.no_armor ) {
if( use_armor_filter( fp ) ) {
memset( &afx, 0, sizeof afx);
iobuf_push_filter( fp, armor_filter, &afx );
}
}
rc = proc_signature_packets( NULL, fp, NULL, name );
iobuf_close(fp);
write_status( STATUS_FILE_DONE );
return rc;
}
/****************
* Verify each file given in the files array or read the names of the
* files from stdin.
* Note: This function can not handle detached signatures.
*/
int
verify_files( int nfiles, char **files )
{
int i;
if( !nfiles ) { /* read the filenames from stdin */
char line[2048];
unsigned int lno = 0;
while( fgets(line, DIM(line), stdin) ) {
lno++;
if( !*line || line[strlen(line)-1] != '\n' ) {
log_error(_("input line %u too long or missing LF\n"), lno );
return GPGERR_GENERAL;
}
/* This code does not work on MSDOS but how cares there are
* also no script languages available. We don't strip any
* spaces, so that we can process nearly all filenames */
line[strlen(line)-1] = 0;
verify_one_file( line );
}
}
else { /* take filenames from the array */
for(i=0; i < nfiles; i++ )
verify_one_file( files[i] );
}
return 0;
}
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