Line data Source code
1 : /* encrypt.c - Encrypt function.
2 : Copyright (C) 2000 Werner Koch (dd9jn)
3 : Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
4 :
5 : This file is part of GPGME.
6 :
7 : GPGME is free software; you can redistribute it and/or modify it
8 : under the terms of the GNU Lesser General Public License as
9 : published by the Free Software Foundation; either version 2.1 of
10 : the License, or (at your option) any later version.
11 :
12 : GPGME is distributed in the hope that it will be useful, but
13 : WITHOUT ANY WARRANTY; without even the implied warranty of
14 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 : Lesser General Public License for more details.
16 :
17 : You should have received a copy of the GNU Lesser General Public
18 : License along with this program; if not, write to the Free Software
19 : Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
20 : 02111-1307, USA. */
21 :
22 : #if HAVE_CONFIG_H
23 : #include <config.h>
24 : #endif
25 : #include <stdlib.h>
26 : #include <string.h>
27 : #include <errno.h>
28 :
29 : #include "gpgme.h"
30 : #include "debug.h"
31 : #include "context.h"
32 : #include "ops.h"
33 :
34 :
35 : typedef struct
36 : {
37 : struct _gpgme_op_encrypt_result result;
38 :
39 : /* The error code from a FAILURE status line or 0. */
40 : gpg_error_t failure_code;
41 :
42 : /* The fingerprint from the last KEY_CONSIDERED status line. */
43 : char *kc_fpr;
44 :
45 : /* The flags from the last KEY_CONSIDERED status line. */
46 : unsigned int kc_flags;
47 :
48 : /* A pointer to the next pointer of the last invalid recipient in
49 : the list. This makes appending new invalid recipients painless
50 : while preserving the order. */
51 : gpgme_invalid_key_t *lastp;
52 : } *op_data_t;
53 :
54 :
55 : static void
56 0 : release_op_data (void *hook)
57 : {
58 0 : op_data_t opd = (op_data_t) hook;
59 0 : gpgme_invalid_key_t invalid_recipient = opd->result.invalid_recipients;
60 :
61 0 : while (invalid_recipient)
62 : {
63 0 : gpgme_invalid_key_t next = invalid_recipient->next;
64 0 : if (invalid_recipient->fpr)
65 0 : free (invalid_recipient->fpr);
66 0 : free (invalid_recipient);
67 0 : invalid_recipient = next;
68 : }
69 :
70 0 : free (opd->kc_fpr);
71 0 : }
72 :
73 :
74 : gpgme_encrypt_result_t
75 0 : gpgme_op_encrypt_result (gpgme_ctx_t ctx)
76 : {
77 : void *hook;
78 : op_data_t opd;
79 : gpgme_error_t err;
80 :
81 0 : TRACE_BEG (DEBUG_CTX, "gpgme_op_encrypt_result", ctx);
82 :
83 0 : err = _gpgme_op_data_lookup (ctx, OPDATA_ENCRYPT, &hook, -1, NULL);
84 0 : opd = hook;
85 :
86 0 : if (err || !opd)
87 : {
88 0 : TRACE_SUC0 ("result=(null)");
89 0 : return NULL;
90 : }
91 :
92 : if (_gpgme_debug_trace ())
93 : {
94 0 : gpgme_invalid_key_t invkeys = opd->result.invalid_recipients;
95 0 : int i = 0;
96 :
97 0 : while (invkeys)
98 : {
99 0 : TRACE_LOG3 ("invalid_recipients[%i] = %s (%s)",
100 : i, invkeys->fpr ? invkeys->fpr : "(null)",
101 : gpg_strerror (invkeys->reason));
102 0 : invkeys = invkeys->next;
103 0 : i++;
104 : }
105 : }
106 :
107 0 : TRACE_SUC1 ("result=%p", &opd->result);
108 0 : return &opd->result;
109 : }
110 :
111 :
112 : gpgme_error_t
113 0 : _gpgme_encrypt_status_handler (void *priv, gpgme_status_code_t code,
114 : char *args)
115 : {
116 0 : gpgme_ctx_t ctx = (gpgme_ctx_t) priv;
117 : gpgme_error_t err;
118 : void *hook;
119 : op_data_t opd;
120 :
121 0 : err = _gpgme_op_data_lookup (ctx, OPDATA_ENCRYPT, &hook, -1, NULL);
122 0 : opd = hook;
123 0 : if (err)
124 0 : return err;
125 :
126 0 : switch (code)
127 : {
128 : case GPGME_STATUS_FAILURE:
129 0 : opd->failure_code = _gpgme_parse_failure (args);
130 0 : break;
131 :
132 : case GPGME_STATUS_EOF:
133 0 : if (opd->result.invalid_recipients)
134 0 : return gpg_error (GPG_ERR_UNUSABLE_PUBKEY);
135 0 : if (opd->failure_code)
136 0 : return opd->failure_code;
137 0 : break;
138 :
139 : case GPGME_STATUS_KEY_CONSIDERED:
140 : /* This is emitted during gpg's key lookup to give information
141 : * about the lookup results. We store the last one so it can be
142 : * used in connection with INV_RECP. */
143 0 : free (opd->kc_fpr);
144 0 : opd->kc_fpr = NULL;
145 0 : err = _gpgme_parse_key_considered (args, &opd->kc_fpr, &opd->kc_flags);
146 0 : if (err)
147 0 : return err;
148 0 : break;
149 :
150 : case GPGME_STATUS_INV_RECP:
151 0 : err = _gpgme_parse_inv_recp (args, 0, opd->kc_fpr, opd->kc_flags,
152 : opd->lastp);
153 0 : if (err)
154 0 : return err;
155 :
156 0 : opd->lastp = &(*opd->lastp)->next;
157 0 : free (opd->kc_fpr);
158 0 : opd->kc_fpr = NULL;
159 0 : break;
160 :
161 : case GPGME_STATUS_NO_RECP:
162 : /* Should not happen, because we require at least one recipient. */
163 0 : return gpg_error (GPG_ERR_GENERAL);
164 :
165 : default:
166 0 : break;
167 : }
168 0 : return 0;
169 : }
170 :
171 :
172 : static gpgme_error_t
173 0 : encrypt_sym_status_handler (void *priv, gpgme_status_code_t code, char *args)
174 : {
175 : gpgme_error_t err;
176 :
177 0 : err = _gpgme_progress_status_handler (priv, code, args);
178 0 : if (!err)
179 0 : err = _gpgme_passphrase_status_handler (priv, code, args);
180 0 : return err;
181 : }
182 :
183 :
184 : static gpgme_error_t
185 0 : encrypt_status_handler (void *priv, gpgme_status_code_t code, char *args)
186 : {
187 : gpgme_error_t err;
188 :
189 0 : err = _gpgme_progress_status_handler (priv, code, args);
190 0 : if (!err)
191 0 : err = _gpgme_encrypt_status_handler (priv, code, args);
192 :
193 0 : return err;
194 : }
195 :
196 :
197 : gpgme_error_t
198 0 : _gpgme_op_encrypt_init_result (gpgme_ctx_t ctx)
199 : {
200 : gpgme_error_t err;
201 : void *hook;
202 : op_data_t opd;
203 :
204 0 : err = _gpgme_op_data_lookup (ctx, OPDATA_ENCRYPT, &hook, sizeof (*opd),
205 : release_op_data);
206 0 : opd = hook;
207 0 : if (err)
208 0 : return err;
209 :
210 0 : opd->lastp = &opd->result.invalid_recipients;
211 0 : return 0;
212 : }
213 :
214 :
215 : static gpgme_error_t
216 0 : encrypt_start (gpgme_ctx_t ctx, int synchronous, gpgme_key_t recp[],
217 : gpgme_encrypt_flags_t flags,
218 : gpgme_data_t plain, gpgme_data_t cipher)
219 : {
220 : gpgme_error_t err;
221 0 : int symmetric = 0;
222 :
223 0 : err = _gpgme_op_reset (ctx, synchronous);
224 0 : if (err)
225 0 : return err;
226 :
227 0 : err = _gpgme_op_encrypt_init_result (ctx);
228 0 : if (err)
229 0 : return err;
230 :
231 0 : symmetric = !recp || (flags & GPGME_ENCRYPT_SYMMETRIC);
232 :
233 0 : if (!plain)
234 0 : return gpg_error (GPG_ERR_NO_DATA);
235 0 : if (!cipher)
236 0 : return gpg_error (GPG_ERR_INV_VALUE);
237 0 : if (recp && ! *recp)
238 0 : return gpg_error (GPG_ERR_INV_VALUE);
239 :
240 0 : if (symmetric && ctx->passphrase_cb)
241 : {
242 : /* Symmetric encryption requires a passphrase. */
243 0 : err = _gpgme_engine_set_command_handler
244 : (ctx->engine, _gpgme_passphrase_command_handler, ctx, NULL);
245 0 : if (err)
246 0 : return err;
247 : }
248 :
249 0 : _gpgme_engine_set_status_handler (ctx->engine,
250 : symmetric
251 : ? encrypt_sym_status_handler
252 : : encrypt_status_handler,
253 : ctx);
254 :
255 0 : return _gpgme_engine_op_encrypt (ctx->engine, recp, flags, plain, cipher,
256 0 : ctx->use_armor);
257 : }
258 :
259 :
260 : gpgme_error_t
261 0 : gpgme_op_encrypt_start (gpgme_ctx_t ctx, gpgme_key_t recp[],
262 : gpgme_encrypt_flags_t flags,
263 : gpgme_data_t plain, gpgme_data_t cipher)
264 : {
265 : gpgme_error_t err;
266 :
267 0 : TRACE_BEG3 (DEBUG_CTX, "gpgme_op_encrypt_start", ctx,
268 : "flags=0x%x, plain=%p, cipher=%p", flags, plain, cipher);
269 :
270 0 : if (!ctx)
271 0 : return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
272 :
273 0 : if (_gpgme_debug_trace () && recp)
274 : {
275 0 : int i = 0;
276 :
277 0 : while (recp[i])
278 : {
279 0 : TRACE_LOG3 ("recipient[%i] = %p (%s)", i, recp[i],
280 : (recp[i]->subkeys && recp[i]->subkeys->fpr) ?
281 : recp[i]->subkeys->fpr : "invalid");
282 0 : i++;
283 : }
284 : }
285 :
286 0 : err = encrypt_start (ctx, 0, recp, flags, plain, cipher);
287 0 : return TRACE_ERR (err);
288 : }
289 :
290 :
291 : /* Encrypt plaintext PLAIN within CTX for the recipients RECP and
292 : store the resulting ciphertext in CIPHER. */
293 : gpgme_error_t
294 0 : gpgme_op_encrypt (gpgme_ctx_t ctx, gpgme_key_t recp[],
295 : gpgme_encrypt_flags_t flags,
296 : gpgme_data_t plain, gpgme_data_t cipher)
297 : {
298 : gpgme_error_t err;
299 :
300 0 : TRACE_BEG3 (DEBUG_CTX, "gpgme_op_encrypt", ctx,
301 : "flags=0x%x, plain=%p, cipher=%p", flags, plain, cipher);
302 :
303 0 : if (!ctx)
304 0 : return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
305 :
306 0 : if (_gpgme_debug_trace () && recp)
307 : {
308 0 : int i = 0;
309 :
310 0 : while (recp[i])
311 : {
312 0 : TRACE_LOG3 ("recipient[%i] = %p (%s)", i, recp[i],
313 : (recp[i]->subkeys && recp[i]->subkeys->fpr) ?
314 : recp[i]->subkeys->fpr : "invalid");
315 0 : i++;
316 : }
317 : }
318 :
319 0 : err = encrypt_start (ctx, 1, recp, flags, plain, cipher);
320 0 : if (!err)
321 0 : err = _gpgme_wait_one (ctx);
322 0 : return TRACE_ERR (err);
323 : }
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