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pkclist.c
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/* pkclist.c
* Copyright (C) 1998 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 "options.h"
#include "packet.h"
#include "errors.h"
#include "keydb.h"
#include "memory.h"
#include "util.h"
#include "trustdb.h"
#include "ttyio.h"
#include "status.h"
#include "i18n.h"
/****************
* Returns true if an ownertrust has changed.
*/
static int
query_ownertrust( ulong lid )
{
char *p;
int rc;
size_t n;
u32 keyid[2];
PKT_public_key *pk ;
int changed=0;
rc = keyid_from_trustdb( lid, keyid );
if( rc ) {
log_error("ooops: can't get keyid for lid %lu\n", lid);
return 0;
}
pk = m_alloc_clear( sizeof *pk );
rc = get_pubkey( pk, keyid );
if( rc ) {
log_error("key %08lX: public key not found: %s\n",
(ulong)keyid[1], g10_errstr(rc) );
return 0;
}
tty_printf(_("No owner trust defined for %lu:\n"
"%4u%c/%08lX %s \""), lid,
nbits_from_pk( pk ), pubkey_letter( pk->pubkey_algo ),
(ulong)keyid[1], datestr_from_pk( pk ) );
p = get_user_id( keyid, &n );
tty_print_string( p, n ),
m_free(p);
tty_printf(_("\"\n\n"
"Please decide how far you trust this user to correctly\n"
"verify other users' keys (by looking at passports,\n"
"checking 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 information\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') ) {
unsigned trust;
switch( *p ) {
case '1': trust = TRUST_UNDEFINED; break;
case '2': trust = TRUST_NEVER ; break;
case '3': trust = TRUST_MARGINAL ; break;
case '4': trust = TRUST_FULLY ; break;
default: BUG();
}
if( !update_ownertrust( lid, trust ) )
changed++;
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);
m_free(pk);
return changed;
}
/****************
* Try to add some more owner trusts (interactive)
* Returns: -1 if no ownertrust were added.
*/
static int
add_ownertrust( PKT_public_key *pk )
{
int rc;
void *context = NULL;
ulong lid;
unsigned trust;
int any=0;
tty_printf(
_("Could not find a valid trust path to the key. Let's see whether we\n"
"can assign some missing owner trust values.\n\n"));
rc = query_trust_record( pk );
if( rc ) {
log_error("Ooops: not in trustdb\n");
return -1;
}
lid = pk->local_id;
while( !(rc=enum_trust_web( &context, &lid )) ) {
rc = get_ownertrust( lid, &trust );
if( rc )
log_fatal("Ooops: couldn't get owner trust for %lu\n", lid);
if( trust == TRUST_UNDEFINED || trust == TRUST_EXPIRED ||
trust == TRUST_UNKNOWN ) {
if( query_ownertrust( lid ) )
any=1;
}
}
if( rc == -1 )
rc = 0;
enum_trust_web( &context, NULL ); /* close */
if( !any )
tty_printf(_("No owner trust values changed.\n\n") );
return rc? rc : any? 0:-1;
}
/****************
* Check whether we can trust this pk which has a trustlevel of TRUSTLEVEL
* Returns: true if we trust.
*/
static int
do_we_trust( PKT_public_key *pk, int trustlevel )
{
int rc;
if( (trustlevel & TRUST_FLAG_REVOKED) ) {
char *answer;
int yes;
log_info("key has been revoked!\n");
if( opt.batch )
return 0;
answer = tty_get("Use this key anyway? ");
tty_kill_prompt();
yes = answer_is_yes(answer);
m_free(answer);
if( !yes )
return 0;
}
switch( (trustlevel & TRUST_MASK) ) {
case TRUST_UNKNOWN: /* No pubkey in trustDB: Insert and check again */
rc = insert_trust_record( pk );
if( rc ) {
log_error("failed to insert it into the trustdb: %s\n",
g10_errstr(rc) );
return 0; /* no */
}
rc = check_trust( pk, &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( pk, trustlevel );
case TRUST_EXPIRED:
log_info("key has expired\n");
return 0; /* no */
case TRUST_UNDEFINED:
if( opt.batch || opt.answer_no )
log_info("no info to calculate a trust probability\n");
else {
rc = add_ownertrust( pk );
if( !rc ) {
rc = check_trust( pk, &trustlevel );
if( rc )
log_fatal("trust check after add_ownertrust failed: %s\n",
g10_errstr(rc) );
/* fixme: this is recursive; we should unroll it */
return do_we_trust( pk, trustlevel );
}
}
return 0;
case TRUST_NEVER:
log_info("We do NOT trust this key\n");
return 0; /* no */
case TRUST_MARGINAL:
log_info("I'm not sure whether this key really belongs to the owner\n"
"but I proceed anyway\n");
return 1; /* yes */
case TRUST_FULLY:
if( opt.verbose )
log_info("This key probably belongs to the owner\n");
return 1; /* yes */
case TRUST_ULTIMATE:
if( opt.verbose )
log_info("This key belongs to us (we have the secret key)\n");
return 1; /* yes */
default: BUG();
}
/* Eventuell fragen falls der trustlevel nicht ausreichend ist */
return 1; /* yes */
}
/****************
* wrapper around do_we_trust, so we can ask whether to use the
* key anyway.
*/
static int
do_we_trust_pre( PKT_public_key *pk, int trustlevel )
{
int rc = do_we_trust( pk, trustlevel );
if( !opt.batch && !rc ) {
char *answer;
tty_printf(_(
"It is NOT certain that the key belongs to its owner.\n"
"If you *really* know what you are doing, you may answer\n"
"the next question with yes\n\n") );
answer = tty_get("Use this key anyway? ");
tty_kill_prompt();
if( answer_is_yes(answer) )
rc = 1;
m_free(answer);
}
else if( opt.always_trust && !rc ) {
log_info(_("WARNING: Using untrusted key!\n"));
rc = 1;
}
return rc;
}
/****************
* Check whether we can trust this signature.
* Returns: Error if we shall not trust this signatures.
*/
int
check_signatures_trust( PKT_signature *sig )
{
PKT_public_key *pk = m_alloc_clear( sizeof *pk );
int trustlevel;
int dont_try = 0;
int rc=0;
rc = get_pubkey( pk, sig->keyid );
if( rc ) { /* this should not happen */
log_error("Ooops; the key vanished - can't check the trust\n");
rc = G10ERR_NO_PUBKEY;
goto leave;
}
retry:
rc = check_trust( pk, &trustlevel );
if( rc ) {
log_error("check trust failed: %s\n", g10_errstr(rc));
goto leave;
}
if( (trustlevel & TRUST_FLAG_REVOKED) ) {
write_status( STATUS_KEYREVOKED );
log_info(_("WARNING: This key has been revoked by its owner!\n"));
log_info(_(" This could mean that the signature is forgery.\n"));
}
switch( (trustlevel & TRUST_MASK) ) {
case TRUST_UNKNOWN: /* No pubkey in trustDB: Insert and check again */
rc = insert_trust_record( pk );
if( rc ) {
log_error("failed to insert it into the trustdb: %s\n",
g10_errstr(rc) );
goto leave;
}
rc = check_trust( pk, &trustlevel );
if( rc )
log_fatal("trust check after insert failed: %s\n",
g10_errstr(rc) );
if( trustlevel == TRUST_UNKNOWN || trustlevel == TRUST_EXPIRED )
BUG();
goto retry;
case TRUST_EXPIRED:
log_info(_("Note: This key has expired!\n"));
break;
case TRUST_UNDEFINED:
if( dont_try || opt.batch || opt.answer_no ) {
write_status( STATUS_TRUST_UNDEFINED );
log_info(_(
"WARNING: This key is not certified with a trusted signature!\n"));
log_info(_(
" There is no indication that the "
"signature belongs to the owner.\n" ));
}
else {
rc = add_ownertrust( pk );
if( rc ) {
dont_try = 1;
rc = 0;
}
goto retry;
}
break;
case TRUST_NEVER:
write_status( STATUS_TRUST_NEVER );
log_info(_("WARNING: We do NOT trust this key!\n"));
log_info(_(" The signature is probably a FORGERY.\n"));
rc = G10ERR_BAD_SIGN;
break;
case TRUST_MARGINAL:
write_status( STATUS_TRUST_MARGINAL );
log_info(_(
"WARNING: This key is not certified with sufficiently trusted signatures!\n"
));
log_info(_(
" It is not certain that the signature belongs to the owner.\n"
));
break;
case TRUST_FULLY:
write_status( STATUS_TRUST_FULLY );
break;
case TRUST_ULTIMATE:
write_status( STATUS_TRUST_ULTIMATE );
break;
default: BUG();
}
leave:
free_public_key( pk );
return rc;
}
void
release_pk_list( PK_LIST pk_list )
{
PK_LIST pk_rover;
for( ; pk_list; pk_list = pk_rover ) {
pk_rover = pk_list->next;
free_public_key( pk_list->pk );
m_free( pk_list );
}
}
int
build_pk_list( STRLIST remusr, PK_LIST *ret_pk_list, unsigned usage )
{
PK_LIST pk_list = NULL;
PKT_public_key *pk=NULL;
int rc=0;
if( !remusr && !opt.batch ) { /* ask */
char *answer=NULL;
tty_printf(_(
"You did not specify a user ID. (you may use \"-r\")\n\n"));
for(;;) {
rc = 0;
m_free(answer);
answer = tty_get(_("Enter the user ID: "));
trim_spaces(answer);
tty_kill_prompt();
if( !*answer )
break;
if( pk )
free_public_key( pk );
pk = m_alloc_clear( sizeof *pk );
pk->pubkey_usage = usage;
rc = get_pubkey_byname( pk, answer );
if( rc )
tty_printf(_("No such user ID.\n"));
else if( !(rc=check_pubkey_algo2(pk->pubkey_algo, usage)) ) {
int trustlevel;
rc = check_trust( pk, &trustlevel );
if( rc ) {
log_error("error checking pk of '%s': %s\n",
answer, g10_errstr(rc) );
}
else if( do_we_trust_pre( pk, trustlevel ) ) {
PK_LIST r;
r = m_alloc( sizeof *r );
r->pk = pk; pk = NULL;
r->next = pk_list;
r->mark = 0;
pk_list = r;
break;
}
}
}
m_free(answer);
if( pk ) {
free_public_key( pk );
pk = NULL;
}
}
else {
for(; remusr; remusr = remusr->next ) {
pk = m_alloc_clear( sizeof *pk );
pk->pubkey_usage = usage;
if( (rc = get_pubkey_byname( pk, remusr->d )) ) {
free_public_key( pk ); pk = NULL;
log_error(_("%s: skipped: %s\n"), remusr->d, g10_errstr(rc) );
}
else if( !(rc=check_pubkey_algo2(pk->pubkey_algo, usage )) ) {
int trustlevel;
rc = check_trust( pk, &trustlevel );
if( rc ) {
free_public_key( pk ); pk = NULL;
log_error(_("%s: error checking key: %s\n"),
remusr->d, g10_errstr(rc) );
}
else if( do_we_trust_pre( pk, trustlevel ) ) {
/* note: do_we_trust may have changed the trustlevel */
PK_LIST r;
r = m_alloc( sizeof *r );
r->pk = pk; pk = NULL;
r->next = pk_list;
r->mark = 0;
pk_list = r;
}
else { /* we don't trust this pk */
free_public_key( pk ); pk = NULL;
}
}
else {
free_public_key( pk ); pk = NULL;
log_error(_("%s: skipped: %s\n"), remusr->d, g10_errstr(rc) );
}
}
}
if( !rc && !pk_list ) {
log_error(_("no valid addressees\n"));
rc = G10ERR_NO_USER_ID;
}
if( rc )
release_pk_list( pk_list );
else
*ret_pk_list = pk_list;
return rc;
}

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