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/* pkclist.c
* Copyright (c) 1997 by Werner Koch (dd9jn)
*
* This file is part of G10.
*
* G10 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.
*
* G10 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 "options.h"
#include "packet.h"
#include "errors.h"
#include "keydb.h"
#include "memory.h"
#include "util.h"
#include "trustdb.h"
#include "ttyio.h"
static int
query_ownertrust( PKT_public_cert *pkc )
{
char *p;
size_t n;
u32 keyid[2];
keyid_from_pkc( pkc, keyid );
tty_printf("No ownertrust specified for:\n"
"%4u%c/%08lX %s \"",
nbits_from_pkc( pkc ), pubkey_letter( pkc->pubkey_algo ),
(ulong)keyid[1], datestr_from_pkc( pkc ) );
p = get_user_id( keyid, &n );
tty_print_string( p, n ),
m_free(p);
tty_printf("\"\n\n"
"Please decide in how far do you trust this user to\n"
"correctly sign other users keys (looking at his passport,\n"
"checking the fingerprints from different sources ...)?\n\n"
" 1 = Don't know\n"
" 2 = I do NOT trust\n"
" 3 = I trust marginally\n"
" 4 = I trust fully\n"
" s = please show me more informations\n\n" );
for(;;) {
p = tty_get("Your decision? ");
trim_spaces(p);
tty_kill_prompt();
if( *p && p[1] )
;
else if( *p == '?' ) {
tty_printf(
"It's up to you to assign a value here; this value will never be exported\n"
"to any 3rd party. We need it to implement the web-of-trust; it has nothing\n"
"to do with the (implicitly created) web-of-certificates.\n");
}
else if( !p[1] && (*p >= '1' && *p <= '4') ) {
/* okay */
break;
}
else if( *p == 's' || *p == 'S' ) {
tty_printf("You will see a list of signators etc. here\n");
}
m_free(p); p = NULL;
}
m_free(p);
return 0;
}
/****************
* Check wether we can trust this pkc which has a trustlevel of TRUSTLEVEL
* Returns: true if we trust.
*/
static int
do_we_trust( PKT_public_cert *pkc, int trustlevel )
{
int rc;
switch( trustlevel ) {
case TRUST_UNKNOWN: /* No pubkey in trustDB: Insert and check again */
rc = insert_trust_record( pkc );
if( rc ) {
log_error("failed to insert it into the trustdb: %s\n",
g10_errstr(rc) );
return 0; /* no */
}
rc = check_trust( pkc, &trustlevel );
if( rc )
log_fatal("trust check after insert failed: %s\n",
g10_errstr(rc) );
if( trustlevel == TRUST_UNKNOWN || trustlevel == TRUST_EXPIRED )
BUG();
return do_we_trust( pkc, trustlevel );
case TRUST_EXPIRED:
log_error("trust has expired: NOT yet implemented\n");
return 0; /* no */
case TRUST_UNDEFINED:
if( opt.batch || opt.answer_no )
log_info("no info to calculate a trust probability\n");
else {
query_ownertrust( pkc );
}
return 0; /* no */
case TRUST_NEVER:
log_info("We do NOT trust this key\n");
return 0; /* no */
case TRUST_MARGINAL:
log_info("I'm not sure wether this keys really belongs to the owner\n"
"but I proceed anyway\n");
return 1; /* yes */
case TRUST_FULLY:
log_info("This key probably belongs to the owner\n");
return 1; /* yes */
case TRUST_ULTIMATE:
log_info("Our own key is always good.\n");
return 1; /* yes */
default: BUG();
}
/* Eventuell fragen falls der trustlevel nicht ausreichend ist */
return 1; /* yes */
}
void
release_pkc_list( PKC_LIST pkc_list )
{
PKC_LIST pkc_rover;
for( ; pkc_list; pkc_list = pkc_rover ) {
pkc_rover = pkc_list->next;
free_public_cert( pkc_list->pkc );
m_free( pkc_list );
}
}
int
build_pkc_list( STRLIST remusr, PKC_LIST *ret_pkc_list )
{
PKC_LIST pkc_list = NULL;
int rc;
if( !remusr ) { /* ask!!! */
log_bug("ask for public key nyi\n");
}
else {
for(; remusr; remusr = remusr->next ) {
PKT_public_cert *pkc;
pkc = m_alloc_clear( sizeof *pkc );
if( (rc = get_pubkey_byname( pkc, remusr->d )) ) {
free_public_cert( pkc ); pkc = NULL;
log_error("skipped '%s': %s\n", remusr->d, g10_errstr(rc) );
}
else if( !(rc=check_pubkey_algo(pkc->pubkey_algo)) ) {
int trustlevel;
rc = check_trust( pkc, &trustlevel );
if( rc ) {
free_public_cert( pkc ); pkc = NULL;
log_error("error checking pkc of '%s': %s\n",
remusr->d, g10_errstr(rc) );
}
else if( do_we_trust( pkc, trustlevel ) ) {
/* note: do_we_trust may have changed the trustlevel */
PKC_LIST r;
r = m_alloc( sizeof *r );
r->pkc = pkc; pkc = NULL;
r->next = pkc_list;
r->mark = 0;
pkc_list = r;
}
else { /* we don't trust this pkc */
free_public_cert( pkc ); pkc = NULL;
}
}
else {
free_public_cert( pkc ); pkc = NULL;
log_error("skipped '%s': %s\n", remusr->d, g10_errstr(rc) );
}
}
}
if( !rc && !pkc_list ) {
log_error("no valid addressees\n");
rc = G10ERR_NO_USER_ID;
}
if( rc )
release_pkc_list( pkc_list );
else
*ret_pkc_list = pkc_list;
return rc;
}
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