Line data Source code
1 : /* delkey.c - delete keys
2 : * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004,
3 : * 2005, 2006 Free Software Foundation, Inc.
4 : * Copyright (C) 2014 Werner Koch
5 : *
6 : * This file is part of GnuPG.
7 : *
8 : * GnuPG is free software; you can redistribute it and/or modify
9 : * it under the terms of the GNU General Public License as published by
10 : * the Free Software Foundation; either version 3 of the License, or
11 : * (at your option) any later version.
12 : *
13 : * GnuPG is distributed in the hope that it will be useful,
14 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 : * GNU General Public License for more details.
17 : *
18 : * You should have received a copy of the GNU General Public License
19 : * along with this program; if not, see <https://www.gnu.org/licenses/>.
20 : */
21 :
22 : #include <config.h>
23 : #include <stdio.h>
24 : #include <stdlib.h>
25 : #include <string.h>
26 : #include <errno.h>
27 : #include <ctype.h>
28 :
29 : #include "gpg.h"
30 : #include "options.h"
31 : #include "packet.h"
32 : #include "status.h"
33 : #include "iobuf.h"
34 : #include "keydb.h"
35 : #include "util.h"
36 : #include "main.h"
37 : #include "trustdb.h"
38 : #include "filter.h"
39 : #include "ttyio.h"
40 : #include "status.h"
41 : #include "i18n.h"
42 : #include "call-agent.h"
43 :
44 :
45 : /****************
46 : * Delete a public or secret key from a keyring.
47 : * r_sec_avail will be set if a secret key is available and the public
48 : * key can't be deleted for that reason.
49 : */
50 : static gpg_error_t
51 92 : do_delete_key( const char *username, int secret, int force, int *r_sec_avail )
52 : {
53 : gpg_error_t err;
54 92 : kbnode_t keyblock = NULL;
55 : kbnode_t node, kbctx;
56 : KEYDB_HANDLE hd;
57 92 : PKT_public_key *pk = NULL;
58 : u32 keyid[2];
59 92 : int okay=0;
60 : int yes;
61 : KEYDB_SEARCH_DESC desc;
62 : int exactmatch;
63 :
64 92 : *r_sec_avail = 0;
65 :
66 92 : hd = keydb_new ();
67 92 : if (!hd)
68 0 : return gpg_error_from_syserror ();
69 :
70 : /* Search the userid. */
71 92 : err = classify_user_id (username, &desc, 1);
72 184 : exactmatch = (desc.mode == KEYDB_SEARCH_MODE_FPR
73 92 : || desc.mode == KEYDB_SEARCH_MODE_FPR16
74 184 : || desc.mode == KEYDB_SEARCH_MODE_FPR20);
75 92 : if (!err)
76 92 : err = keydb_search (hd, &desc, 1, NULL);
77 92 : if (err)
78 : {
79 5 : log_error (_("key \"%s\" not found: %s\n"), username, gpg_strerror (err));
80 5 : write_status_text (STATUS_DELETE_PROBLEM, "1");
81 5 : goto leave;
82 : }
83 :
84 : /* Read the keyblock. */
85 87 : err = keydb_get_keyblock (hd, &keyblock);
86 87 : if (err)
87 : {
88 0 : log_error (_("error reading keyblock: %s\n"), gpg_strerror (err) );
89 0 : goto leave;
90 : }
91 :
92 : /* Get the keyid from the keyblock. */
93 87 : node = find_kbnode( keyblock, PKT_PUBLIC_KEY );
94 87 : if (!node)
95 : {
96 0 : log_error ("Oops; key not found anymore!\n");
97 0 : err = gpg_error (GPG_ERR_GENERAL);
98 0 : goto leave;
99 : }
100 87 : pk = node->pkt->pkt.public_key;
101 87 : keyid_from_pk (pk, keyid);
102 :
103 87 : if (!secret && !force)
104 : {
105 87 : if (have_secret_key_with_kid (keyid))
106 : {
107 0 : *r_sec_avail = 1;
108 0 : err = gpg_error (GPG_ERR_EOF);
109 0 : goto leave;
110 : }
111 : else
112 87 : err = 0;
113 : }
114 :
115 87 : if (secret && !have_secret_key_with_kid (keyid))
116 : {
117 0 : err = gpg_error (GPG_ERR_NOT_FOUND);
118 0 : log_error (_("key \"%s\" not found\n"), username);
119 0 : write_status_text (STATUS_DELETE_PROBLEM, "1");
120 0 : goto leave;
121 : }
122 :
123 :
124 87 : if (opt.batch && exactmatch)
125 84 : okay++;
126 3 : else if (opt.batch && secret)
127 : {
128 0 : log_error(_("can't do this in batch mode\n"));
129 0 : log_info (_("(unless you specify the key by fingerprint)\n"));
130 : }
131 3 : else if (opt.batch && opt.answer_yes)
132 3 : okay++;
133 0 : else if (opt.batch)
134 : {
135 0 : log_error(_("can't do this in batch mode without \"--yes\"\n"));
136 0 : log_info (_("(unless you specify the key by fingerprint)\n"));
137 : }
138 : else
139 : {
140 0 : if (secret)
141 0 : print_seckey_info (pk);
142 : else
143 0 : print_pubkey_info (NULL, pk );
144 0 : tty_printf( "\n" );
145 :
146 0 : yes = cpr_get_answer_is_yes
147 : (secret? "delete_key.secret.okay": "delete_key.okay",
148 0 : _("Delete this key from the keyring? (y/N) "));
149 :
150 0 : if (!cpr_enabled() && secret && yes)
151 : {
152 : /* I think it is not required to check a passphrase; if the
153 : * user is so stupid as to let others access his secret
154 : * keyring (and has no backup) - it is up him to read some
155 : * very basic texts about security. */
156 0 : yes = cpr_get_answer_is_yes
157 : ("delete_key.secret.okay",
158 0 : _("This is a secret key! - really delete? (y/N) "));
159 : }
160 :
161 0 : if (yes)
162 0 : okay++;
163 : }
164 :
165 :
166 87 : if (okay)
167 : {
168 87 : if (secret)
169 : {
170 : char *prompt;
171 0 : gpg_error_t firsterr = 0;
172 : char *hexgrip;
173 :
174 0 : setup_main_keyids (keyblock);
175 0 : for (kbctx=NULL; (node = walk_kbnode (keyblock, &kbctx, 0)); )
176 : {
177 0 : if (!(node->pkt->pkttype == PKT_PUBLIC_KEY
178 0 : || node->pkt->pkttype == PKT_PUBLIC_SUBKEY))
179 0 : continue;
180 :
181 0 : if (agent_probe_secret_key (NULL, node->pkt->pkt.public_key))
182 0 : continue; /* No secret key for that public (sub)key. */
183 :
184 0 : prompt = gpg_format_keydesc (node->pkt->pkt.public_key,
185 : FORMAT_KEYDESC_DELKEY, 1);
186 0 : err = hexkeygrip_from_pk (node->pkt->pkt.public_key, &hexgrip);
187 : /* NB: We require --yes to advise the agent not to
188 : * request a confirmation. The rationale for this extra
189 : * pre-caution is that since 2.1 the secret key may also
190 : * be used for other protocols and thus deleting it from
191 : * the gpg would also delete the key for other tools. */
192 0 : if (!err)
193 0 : err = agent_delete_key (NULL, hexgrip, prompt,
194 : opt.answer_yes);
195 0 : xfree (prompt);
196 0 : xfree (hexgrip);
197 0 : if (err)
198 : {
199 0 : if (gpg_err_code (err) == GPG_ERR_KEY_ON_CARD)
200 0 : write_status_text (STATUS_DELETE_PROBLEM, "1");
201 0 : log_error (_("deleting secret %s failed: %s\n"),
202 0 : (node->pkt->pkttype == PKT_PUBLIC_KEY
203 : ? _("key"):_("subkey")),
204 : gpg_strerror (err));
205 0 : if (!firsterr)
206 0 : firsterr = err;
207 0 : if (gpg_err_code (err) == GPG_ERR_CANCELED
208 0 : || gpg_err_code (err) == GPG_ERR_FULLY_CANCELED)
209 : {
210 0 : write_status_error ("delete_key.secret", err);
211 0 : break;
212 : }
213 : }
214 :
215 : }
216 :
217 0 : err = firsterr;
218 0 : if (firsterr)
219 0 : goto leave;
220 : }
221 : else
222 : {
223 87 : err = keydb_delete_keyblock (hd);
224 87 : if (err)
225 : {
226 0 : log_error (_("deleting keyblock failed: %s\n"),
227 : gpg_strerror (err));
228 0 : goto leave;
229 : }
230 : }
231 :
232 : /* Note that the ownertrust being cleared will trigger a
233 : revalidation_mark(). This makes sense - only deleting keys
234 : that have ownertrust set should trigger this. */
235 :
236 87 : if (!secret && pk && clear_ownertrusts (pk))
237 : {
238 1 : if (opt.verbose)
239 0 : log_info (_("ownertrust information cleared\n"));
240 : }
241 : }
242 :
243 : leave:
244 92 : keydb_release (hd);
245 92 : release_kbnode (keyblock);
246 92 : return err;
247 : }
248 :
249 : /****************
250 : * Delete a public or secret key from a keyring.
251 : */
252 : gpg_error_t
253 43 : delete_keys (strlist_t names, int secret, int allow_both)
254 : {
255 : gpg_error_t err;
256 : int avail;
257 43 : int force = (!allow_both && !secret && opt.expert);
258 :
259 : /* Force allows us to delete a public key even if a secret key
260 : exists. */
261 :
262 130 : for ( ;names ; names=names->next )
263 : {
264 92 : err = do_delete_key (names->d, secret, force, &avail);
265 92 : if (err && avail)
266 : {
267 0 : if (allow_both)
268 : {
269 0 : err = do_delete_key (names->d, 1, 0, &avail);
270 0 : if (!err)
271 0 : err = do_delete_key (names->d, 0, 0, &avail);
272 : }
273 : else
274 : {
275 0 : log_error (_("there is a secret key for public key \"%s\"!\n"),
276 0 : names->d);
277 0 : log_info(_("use option \"--delete-secret-keys\" to delete"
278 : " it first.\n"));
279 0 : write_status_text (STATUS_DELETE_PROBLEM, "2");
280 0 : return err;
281 : }
282 : }
283 :
284 92 : if (err)
285 : {
286 10 : log_error ("%s: delete key failed: %s\n",
287 5 : names->d, gpg_strerror (err));
288 5 : return err;
289 : }
290 : }
291 :
292 38 : return 0;
293 : }
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