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/* skclist.c - Build a list of secret keys
* Copyright (C) 1998, 1999, 2000, 2001, 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include "gpg.h"
#include "options.h"
#include "packet.h"
#include "errors.h"
#include "keydb.h"
#include "util.h"
#include "i18n.h"
#include "cipher.h"
#ifndef GCRYCTL_FAKED_RANDOM_P
#define GCRYCTL_FAKED_RANDOM_P 51
#endif
/* Return true if Libgcrypt's RNG is in faked mode. */
int
random_is_faked (void)
{
/* We use a runtime check to allow for slow migrattion of libgcrypt.
We can't use the constant becuase that one is actually an enum
value. */
gpg_error_t err = gcry_control ( 51 /*GCRYCTL_FAKED_RANDOM_P*/, 0);
if (!err)
return 0;
if (gpg_err_code (err) != GPG_ERR_INV_OP)
return 1;
log_info ("WARNING: libgcrypt too old.\n");
log_info (" can't check whether we are in faked RNG mode\n");
return 0; /* Need to return false. */
}
void
release_sk_list( SK_LIST sk_list )
{
SK_LIST sk_rover;
for( ; sk_list; sk_list = sk_rover ) {
sk_rover = sk_list->next;
free_secret_key( sk_list->sk );
xfree( sk_list );
}
}
/* Check that we are only using keys which don't have
* the string "(insecure!)" or "not secure" or "do not use"
* in one of the user ids
*/
static int
is_insecure( PKT_secret_key *sk )
{
u32 keyid[2];
KBNODE node = NULL, u;
int insecure = 0;
keyid_from_sk( sk, keyid );
node = get_pubkeyblock( keyid );
for ( u = node; u; u = u->next ) {
if ( u->pkt->pkttype == PKT_USER_ID ) {
PKT_user_id *id = u->pkt->pkt.user_id;
if ( id->attrib_data )
continue; /* skip attribute packets */
if ( strstr( id->name, "(insecure!)" )
|| strstr( id->name, "not secure" )
|| strstr( id->name, "do not use" )
|| strstr( id->name, "(INSECURE!)" ) ) {
insecure = 1;
break;
}
}
}
release_kbnode( node );
return insecure;
}
static int
key_present_in_sk_list(SK_LIST sk_list, PKT_secret_key *sk)
{
for (; sk_list; sk_list = sk_list->next) {
if ( !cmp_secret_keys(sk_list->sk, sk) )
return 0;
}
return -1;
}
static int
is_duplicated_entry (strlist_t list, strlist_t item)
{
for(; list && list != item; list = list->next) {
if ( !strcmp (list->d, item->d) )
return 1;
}
return 0;
}
int
build_sk_list( strlist_t locusr, SK_LIST *ret_sk_list,
int unlock, unsigned int use )
{
SK_LIST sk_list = NULL;
int rc;
if( !locusr )
{ /* use the default one */
PKT_secret_key *sk;
sk = xmalloc_clear( sizeof *sk );
sk->req_usage = use;
if( (rc = get_seckey_byname( sk, NULL, unlock )) ) {
free_secret_key( sk ); sk = NULL;
log_error("no default secret key: %s\n", g10_errstr(rc) );
}
else if( !(rc=openpgp_pk_test_algo2 (sk->pubkey_algo, use)) )
{
SK_LIST r;
if( random_is_faked() && !is_insecure( sk ) )
{
log_info(_("key is not flagged as insecure - "
"can't use it with the faked RNG!\n"));
free_secret_key( sk ); sk = NULL;
}
else
{
r = xmalloc( sizeof *r );
r->sk = sk; sk = NULL;
r->next = sk_list;
r->mark = 0;
sk_list = r;
}
}
else
{
free_secret_key( sk ); sk = NULL;
log_error("invalid default secret key: %s\n", g10_errstr(rc) );
}
}
else {
strlist_t locusr_orig = locusr;
for(; locusr; locusr = locusr->next ) {
PKT_secret_key *sk;
rc = 0;
/* Do an early check agains duplicated entries. However this
* won't catch all duplicates because the user IDs may be
* specified in different ways.
*/
if ( is_duplicated_entry ( locusr_orig, locusr ) )
{
log_error(_("skipped \"%s\": duplicated\n"), locusr->d );
continue;
}
sk = xmalloc_clear( sizeof *sk );
sk->req_usage = use;
if( (rc = get_seckey_byname( sk, locusr->d, 0 )) )
{
free_secret_key( sk ); sk = NULL;
log_error(_("skipped \"%s\": %s\n"),
locusr->d, g10_errstr(rc) );
}
else if ( key_present_in_sk_list(sk_list, sk) == 0) {
free_secret_key(sk); sk = NULL;
log_info(_("skipped: secret key already present\n"));
}
else if ( unlock && (rc = check_secret_key( sk, 0 )) )
{
free_secret_key( sk ); sk = NULL;
log_error(_("skipped \"%s\": %s\n"),
locusr->d, g10_errstr(rc) );
}
else if( !(rc=openpgp_pk_test_algo2 (sk->pubkey_algo, use)) ) {
SK_LIST r;
if( sk->version == 4 && (use & PUBKEY_USAGE_SIG)
&& sk->pubkey_algo == PUBKEY_ALGO_ELGAMAL_E )
{
log_info(_("skipped \"%s\": %s\n"),locusr->d,
_("this is a PGP generated Elgamal key which"
" is not secure for signatures!"));
free_secret_key( sk ); sk = NULL;
}
else if( random_is_faked() && !is_insecure( sk ) ) {
log_info(_("key is not flagged as insecure - "
"can't use it with the faked RNG!\n"));
free_secret_key( sk ); sk = NULL;
}
else {
r = xmalloc( sizeof *r );
r->sk = sk; sk = NULL;
r->next = sk_list;
r->mark = 0;
sk_list = r;
}
}
else {
free_secret_key( sk ); sk = NULL;
log_error("skipped \"%s\": %s\n", locusr->d, g10_errstr(rc) );
}
}
}
if( !rc && !sk_list ) {
log_error("no valid signators\n");
rc = G10ERR_NO_USER_ID;
}
if( rc )
release_sk_list( sk_list );
else
*ret_sk_list = sk_list;
return rc;
}
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