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e53f603728
* agent/command.c (cmd_readkey): Add option --no-data and special
handling for $SIGNKEYID and $AUTHKEYID.
* g10/call-agent.c (agent_scd_getattr): Create shadow keys for KEY-FPR
output.
* g10/skclist.c (enum_secret_keys): Automagically get a missing public
key for the current card.
Signed-off-by: Werner Koch <wk@gnupg.org>
Backported-from-master: 50293ec2eb)
638 lines
19 KiB
C
638 lines
19 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 <https://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 "gpg.h"
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#include "options.h"
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#include "packet.h"
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#include "../common/status.h"
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#include "keydb.h"
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#include "../common/util.h"
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#include "../common/i18n.h"
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#include "keyserver-internal.h"
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#include "call-agent.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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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 (ctrl_t ctrl, 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 (ctrl, 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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gpg_error_t
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build_sk_list (ctrl_t ctrl,
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strlist_t locusr, SK_LIST *ret_sk_list, 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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/* XXX: Change this function to use get_pubkeys instead of
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getkey_byname to detect ambiguous key specifications and warn
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about duplicate keyblocks. For ambiguous key specifications on
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the command line or provided interactively, prompt the user to
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select the best key. If a key specification is ambiguous and we
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are in batch mode, die. */
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if (!locusr) /* No user ids given - use the card key or the default key. */
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{
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struct agent_card_info_s info;
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PKT_public_key *pk;
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char *serialno;
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memset (&info, 0, sizeof(info));
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pk = xmalloc_clear (sizeof *pk);
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pk->req_usage = use;
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/* Check if a card is available. If any, use the key as a hint. */
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err = agent_scd_serialno (&serialno, NULL);
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if (!err)
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{
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xfree (serialno);
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err = agent_scd_getattr ("KEY-FPR", &info);
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if (err)
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log_error ("error retrieving key fingerprint from card: %s\n",
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gpg_strerror (err));
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}
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err = get_seckey_default_or_card (ctrl, pk,
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info.fpr1valid? info.fpr1 : NULL, 20);
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if (err)
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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 (ctrl, 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 (ctrl, 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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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 (ctrl, 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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/* Enumerate some secret keys (specifically, those specified with
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* --default-key and --try-secret-key). Use the following procedure:
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*
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* 1) Initialize a void pointer to NULL
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* 2) Pass a reference to this pointer to this function (CONTEXT)
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* and provide space for the secret key (SK)
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* 3) Call this function as long as it does not return an error (or
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* until you are done). The error code GPG_ERR_EOF indicates the
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* end of the listing.
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* 4) Call this function a last time with SK set to NULL,
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* so that can free it's context.
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*
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* TAKE CARE: When the function returns SK belongs to CONTEXT and may
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* not be freed by the caller; neither on success nor on error.
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*
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* In pseudo-code:
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*
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* void *ctx = NULL;
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* PKT_public_key *sk = xmalloc_clear (sizeof (*sk));
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*
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* while ((err = enum_secret_keys (&ctx, sk)))
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* { // Process SK.
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* if (done)
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* break;
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* sk = xmalloc_clear (sizeof (*sk));
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* }
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*
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* // Release any resources used by CTX.
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* enum_secret_keys (&ctx, NULL);
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*
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* if (gpg_err_code (err) != GPG_ERR_EOF)
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* ; // An error occurred.
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*/
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gpg_error_t
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enum_secret_keys (ctrl_t ctrl, void **context, PKT_public_key *sk)
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{
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gpg_error_t err = 0;
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const char *name;
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int cardkey; /* We got an encryption fingerprint from the card */
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/* in c->info.fpr2. */
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kbnode_t keyblock;
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struct
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{
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int eof;
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int state;
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int cardkey_done;
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strlist_t sl;
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strlist_t card_list;
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char *serialno;
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char fpr2[2 * MAX_FINGERPRINT_LEN + 3 ];
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struct agent_card_info_s info;
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kbnode_t keyblock;
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kbnode_t node;
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getkey_ctx_t ctx;
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SK_LIST results;
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} *c = *context;
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#if MAX_FINGERPRINT_LEN < KEYGRIP_LEN
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# error buffer too short for this configuration
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#endif
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if (!c)
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{
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/* Make a new context. */
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c = xtrycalloc (1, sizeof *c);
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if (!c)
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{
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err = gpg_error_from_syserror ();
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free_public_key (sk);
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return err;
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}
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*context = c;
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}
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if (!sk)
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{
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/* Free the context. */
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xfree (c->serialno);
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free_strlist (c->card_list);
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release_sk_list (c->results);
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release_kbnode (c->keyblock);
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getkey_end (ctrl, c->ctx);
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xfree (c);
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*context = NULL;
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return 0;
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}
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if (c->eof)
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{
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free_public_key (sk);
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return gpg_error (GPG_ERR_EOF);
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}
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for (;;)
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{
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/* Loop until we have a keyblock. */
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while (!c->keyblock)
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{
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/* Loop over the list of secret keys. */
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do
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{
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char *serialno;
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name = NULL;
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cardkey = 0;
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keyblock = NULL;
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switch (c->state)
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{
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case 0: /* First try to use the --default-key. */
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name = parse_def_secret_key (ctrl);
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c->state = 1;
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break;
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case 1: /* Init list of keys to try. */
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c->sl = opt.secret_keys_to_try;
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c->state++;
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break;
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case 2: /* Get next item from list. */
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if (c->sl)
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{
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name = c->sl->d;
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c->sl = c->sl->next;
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}
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else
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c->state++;
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break;
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case 3: /* Init list of card keys to try. */
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err = agent_scd_cardlist (&c->card_list);
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if (!err)
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agent_scd_serialno (&c->serialno, NULL);
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c->sl = c->card_list;
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c->state++;
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break;
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case 4: /* Get next item from card list. */
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if (c->sl)
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{
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err = agent_scd_serialno (&serialno, c->sl->d);
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if (err)
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{
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if (opt.verbose)
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log_info (_("error getting serial number of card: %s\n"),
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gpg_strerror (err));
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c->sl = c->sl->next;
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continue;
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}
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xfree (serialno);
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err = agent_scd_getattr ("KEY-FPR", &c->info);
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if (!err)
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{
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if (c->info.fpr2valid)
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{
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c->fpr2[0] = '0';
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c->fpr2[1] = 'x';
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bin2hex (c->info.fpr2, sizeof c->info.fpr2,
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c->fpr2 + 2);
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name = c->fpr2;
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cardkey = 1;
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}
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}
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else if (gpg_err_code (err) == GPG_ERR_INV_NAME)
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{
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/* KEY-FPR not supported by the card - get
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* the key using the keygrip. */
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char *keyref;
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strlist_t kplist, sl;
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const char *s;
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int i;
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err = agent_scd_getattr_one ("$ENCRKEYID", &keyref);
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if (!err)
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{
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err = agent_scd_keypairinfo (ctrl, &kplist);
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if (!err)
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{
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for (sl = kplist; sl; sl = sl->next)
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if ((s = strchr (sl->d, ' '))
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&& !strcmp (s+1, keyref))
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break;
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if (sl)
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{
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c->fpr2[0] = '&';
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for (i=1, s=sl->d;
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(*s && *s != ' '
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&& i < sizeof c->fpr2 - 3);
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s++, i++)
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c->fpr2[i] = *s;
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c->fpr2[i] = 0;
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name = c->fpr2;
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}
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else /* Restore error. */
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err = gpg_error (GPG_ERR_INV_NAME);
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free_strlist (kplist);
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}
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}
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xfree (keyref);
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}
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if (err)
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log_error ("error retrieving key from card: %s\n",
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gpg_strerror (err));
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c->sl = c->sl->next;
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}
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else
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{
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serialno = c->serialno;
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if (serialno)
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{
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/* Select the original card again. */
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agent_scd_serialno (&c->serialno, serialno);
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xfree (serialno);
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}
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c->state++;
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}
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break;
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case 5: /* Init search context to enum all secret keys. */
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err = getkey_bynames (ctrl, &c->ctx, NULL, NULL, 1,
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&keyblock);
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if (err)
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{
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release_kbnode (keyblock);
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keyblock = NULL;
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getkey_end (ctrl, c->ctx);
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c->ctx = NULL;
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}
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c->state++;
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break;
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case 6: /* Get next item from the context. */
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if (c->ctx)
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|
{
|
|
err = getkey_next (ctrl, c->ctx, NULL, &keyblock);
|
|
if (err)
|
|
{
|
|
release_kbnode (keyblock);
|
|
keyblock = NULL;
|
|
getkey_end (ctrl, c->ctx);
|
|
c->ctx = NULL;
|
|
}
|
|
}
|
|
else
|
|
c->state++;
|
|
break;
|
|
|
|
default: /* No more names to check - stop. */
|
|
c->eof = 1;
|
|
free_public_key (sk);
|
|
return gpg_error (GPG_ERR_EOF);
|
|
}
|
|
}
|
|
while ((!name || !*name) && !keyblock);
|
|
|
|
if (keyblock)
|
|
c->node = c->keyblock = keyblock;
|
|
else
|
|
{
|
|
err = getkey_byname (ctrl, NULL, NULL, name, 1, &c->keyblock);
|
|
if (err)
|
|
{
|
|
/* getkey_byname might return a keyblock even in the
|
|
error case - I have not checked. Thus better release
|
|
it. */
|
|
release_kbnode (c->keyblock);
|
|
c->keyblock = NULL;
|
|
/* If this was a card key we might not yet have the
|
|
* public key for it. Thus check whether the card
|
|
* can return the fingerprint of the encryption key
|
|
* and we can then find the public key via LDAP. */
|
|
if (cardkey && !c->cardkey_done
|
|
&& gpg_err_code (err) == GPG_ERR_NO_SECKEY)
|
|
{
|
|
/* Note that this code does not handle the case
|
|
* for two readers having both openpgp
|
|
* encryption keys. Only one will be tried. */
|
|
c->cardkey_done = 1;
|
|
if (opt.debug)
|
|
log_debug ("using LDAP to find public key"
|
|
" for current card\n");
|
|
if (!keyserver_import_fprint
|
|
(ctrl, c->info.fpr2, sizeof c->info.fpr2,
|
|
opt.keyserver, KEYSERVER_IMPORT_FLAG_LDAP))
|
|
{
|
|
char fpr_string[MAX_FINGERPRINT_LEN * 2 + 1];
|
|
|
|
bin2hex (c->info.fpr2, sizeof c->info.fpr2,
|
|
fpr_string);
|
|
err = getkey_byname (ctrl, NULL, NULL, fpr_string, 1,
|
|
&c->keyblock);
|
|
if (err)
|
|
{
|
|
release_kbnode (c->keyblock);
|
|
c->keyblock = NULL;
|
|
}
|
|
else
|
|
c->node = c->keyblock;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
c->node = c->keyblock;
|
|
}
|
|
}
|
|
|
|
/* Get the next key from the current keyblock. */
|
|
for (; c->node; c->node = c->node->next)
|
|
{
|
|
if (c->node->pkt->pkttype == PKT_PUBLIC_KEY
|
|
|| c->node->pkt->pkttype == PKT_PUBLIC_SUBKEY)
|
|
{
|
|
SK_LIST r;
|
|
|
|
/* Skip this candidate if it's already enumerated. */
|
|
for (r = c->results; r; r = r->next)
|
|
if (!cmp_public_keys (r->pk, c->node->pkt->pkt.public_key))
|
|
break;
|
|
if (r)
|
|
continue;
|
|
|
|
copy_public_key (sk, c->node->pkt->pkt.public_key);
|
|
c->node = c->node->next;
|
|
|
|
r = xtrycalloc (1, sizeof (*r));
|
|
if (!r)
|
|
{
|
|
err = gpg_error_from_syserror ();
|
|
free_public_key (sk);
|
|
return err;
|
|
}
|
|
|
|
r->pk = sk;
|
|
r->next = c->results;
|
|
c->results = r;
|
|
|
|
return 0; /* Found. */
|
|
}
|
|
}
|
|
|
|
/* Dispose the keyblock and continue. */
|
|
release_kbnode (c->keyblock);
|
|
c->keyblock = NULL;
|
|
}
|
|
}
|