mirror of git://git.gnupg.org/gnupg.git
280 lines
7.1 KiB
C
280 lines
7.1 KiB
C
/* skclist.c - Build a list of secret keys
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* Copyright (C) 1998, 1999, 2000, 2001, 2006,
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* 2010 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include "gpg.h"
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#include "options.h"
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#include "packet.h"
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#include "status.h"
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#include "keydb.h"
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#include "util.h"
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#include "i18n.h"
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#include "cipher.h"
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/* Return true if Libgcrypt's RNG is in faked mode. */
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int
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random_is_faked (void)
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{
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return !!gcry_control (GCRYCTL_FAKED_RANDOM_P, 0);
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}
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void
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release_sk_list (SK_LIST sk_list)
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{
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SK_LIST sk_rover;
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for (; sk_list; sk_list = sk_rover)
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{
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sk_rover = sk_list->next;
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if (sk_list->pk)
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free_public_key (sk_list->pk);
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xfree (sk_list);
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}
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}
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/* Check that we are only using keys which don't have
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* the string "(insecure!)" or "not secure" or "do not use"
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* in one of the user ids. */
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static int
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is_insecure (PKT_public_key *pk)
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{
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u32 keyid[2];
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KBNODE node = NULL, u;
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int insecure = 0;
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keyid_from_pk (pk, keyid);
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node = get_pubkeyblock (keyid);
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for (u = node; u; u = u->next)
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{
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if (u->pkt->pkttype == PKT_USER_ID)
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{
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PKT_user_id *id = u->pkt->pkt.user_id;
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if (id->attrib_data)
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continue; /* skip attribute packets */
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if (strstr (id->name, "(insecure!)")
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|| strstr (id->name, "not secure")
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|| strstr (id->name, "do not use")
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|| strstr (id->name, "(INSECURE!)"))
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{
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insecure = 1;
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break;
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}
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}
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}
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release_kbnode (node);
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return insecure;
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}
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static int
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key_present_in_sk_list (SK_LIST sk_list, PKT_public_key *pk)
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{
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for (; sk_list; sk_list = sk_list->next)
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{
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if (!cmp_public_keys (sk_list->pk, pk))
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return 0;
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}
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return -1;
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}
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static int
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is_duplicated_entry (strlist_t list, strlist_t item)
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{
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for (; list && list != item; list = list->next)
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{
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if (!strcmp (list->d, item->d))
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return 1;
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}
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return 0;
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}
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/* FIXME: We ignore the UNLOCK flag - should not be needed anymore. */
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gpg_error_t
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build_sk_list (strlist_t locusr, SK_LIST *ret_sk_list,
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int unlock, unsigned int use)
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{
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gpg_error_t err;
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SK_LIST sk_list = NULL;
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if (!locusr) /* No user ids given - use the default key. */
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{
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PKT_public_key *pk;
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pk = xmalloc_clear (sizeof *pk);
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pk->req_usage = use;
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if ((err = getkey_byname (NULL, pk, NULL, 1, NULL)))
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{
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free_public_key (pk);
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pk = NULL;
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log_error ("no default secret key: %s\n", gpg_strerror (err));
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write_status_text (STATUS_INV_SGNR, get_inv_recpsgnr_code (err));
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}
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else if ((err = openpgp_pk_test_algo2 (pk->pubkey_algo, use)))
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{
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free_public_key (pk);
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pk = NULL;
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log_error ("invalid default secret key: %s\n", gpg_strerror (err));
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write_status_text (STATUS_INV_SGNR, get_inv_recpsgnr_code (err));
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}
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else
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{
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SK_LIST r;
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if (random_is_faked () && !is_insecure (pk))
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{
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log_info (_("key is not flagged as insecure - "
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"can't use it with the faked RNG!\n"));
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free_public_key (pk);
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pk = NULL;
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write_status_text (STATUS_INV_SGNR,
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get_inv_recpsgnr_code (GPG_ERR_NOT_TRUSTED));
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}
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else
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{
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r = xmalloc (sizeof *r);
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r->pk = pk;
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pk = NULL;
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r->next = sk_list;
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r->mark = 0;
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sk_list = r;
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}
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}
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}
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else /* Check the given user ids. */
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{
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strlist_t locusr_orig = locusr;
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for (; locusr; locusr = locusr->next)
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{
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PKT_public_key *pk;
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err = 0;
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/* Do an early check against duplicated entries. However
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* this won't catch all duplicates because the user IDs may
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* be specified in different ways. */
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if (is_duplicated_entry (locusr_orig, locusr))
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{
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log_info (_("skipped \"%s\": duplicated\n"), locusr->d);
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continue;
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}
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pk = xmalloc_clear (sizeof *pk);
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pk->req_usage = use;
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if ((err = getkey_byname (NULL, pk, locusr->d, 1, NULL)))
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{
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free_public_key (pk);
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pk = NULL;
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log_error (_("skipped \"%s\": %s\n"),
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locusr->d, gpg_strerror (err));
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write_status_text_and_buffer
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(STATUS_INV_SGNR, get_inv_recpsgnr_code (err),
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locusr->d, strlen (locusr->d), -1);
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}
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else if (!key_present_in_sk_list (sk_list, pk))
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{
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free_public_key (pk);
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pk = NULL;
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log_info (_("skipped: secret key already present\n"));
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}
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/* Fixme: We could change the next test by a call to gpg-agent which
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would then cache the passphrase. */
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/* else if (unlock && (rc = check_secret_key (sk, 0))) */
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/* { */
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/* free_secret_key (sk); */
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/* sk = NULL; */
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/* log_error (_("skipped \"%s\": %s\n"), */
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/* locusr->d, g10_errstr (rc)); */
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/* write_status_text_and_buffer */
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/* (STATUS_INV_SGNR, get_inv_recpsgnr_code (rc), */
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/* locusr->d, strlen (locusr->d), -1); */
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/* } */
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else if ((err = openpgp_pk_test_algo2 (pk->pubkey_algo, use)))
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{
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free_public_key (pk);
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pk = NULL;
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log_error ("skipped \"%s\": %s\n", locusr->d, gpg_strerror (err));
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write_status_text_and_buffer
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(STATUS_INV_SGNR, get_inv_recpsgnr_code (err),
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locusr->d, strlen (locusr->d), -1);
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}
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else
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{
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SK_LIST r;
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if (pk->version == 4 && (use & PUBKEY_USAGE_SIG)
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&& pk->pubkey_algo == PUBKEY_ALGO_ELGAMAL_E)
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{
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log_info (_("skipped \"%s\": %s\n"), locusr->d,
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_("this is a PGP generated Elgamal key which"
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" is not secure for signatures!"));
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free_public_key (pk);
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pk = NULL;
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write_status_text_and_buffer
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(STATUS_INV_SGNR,
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get_inv_recpsgnr_code (GPG_ERR_WRONG_KEY_USAGE),
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locusr->d, strlen (locusr->d), -1);
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}
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else if (random_is_faked () && !is_insecure (pk))
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{
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log_info (_("key is not flagged as insecure - "
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"can't use it with the faked RNG!\n"));
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free_public_key (pk);
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pk = NULL;
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write_status_text_and_buffer
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(STATUS_INV_SGNR,
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get_inv_recpsgnr_code (GPG_ERR_NOT_TRUSTED),
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locusr->d, strlen (locusr->d), -1);
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}
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else
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{
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r = xmalloc (sizeof *r);
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r->pk = pk;
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pk = NULL;
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r->next = sk_list;
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r->mark = 0;
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sk_list = r;
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}
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}
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}
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}
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if (!err && !sk_list)
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{
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log_error ("no valid signators\n");
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write_status_text (STATUS_NO_SGNR, "0");
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err = gpg_error (GPG_ERR_NO_USER_ID);
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}
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if (err)
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release_sk_list (sk_list);
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else
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*ret_sk_list = sk_list;
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return err;
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}
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