summaryrefslogtreecommitdiff
path: root/src/encrypt.c
blob: 792c25c56d4e1cb51e84a6e2a441c62c70be3519 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
/* encrypt.c - Encrypt function.
   Copyright (C) 2000 Werner Koch (dd9jn)
   Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH

   This file is part of GPGME.

   GPGME is free software; you can redistribute it and/or modify it
   under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of
   the License, or (at your option) any later version.

   GPGME 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
   02111-1307, USA.  */

#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include "gpgme.h"
#include "debug.h"
#include "context.h"
#include "ops.h"


typedef struct
{
  struct _gpgme_op_encrypt_result result;

  /* A pointer to the next pointer of the last invalid recipient in
     the list.  This makes appending new invalid recipients painless
     while preserving the order.  */
  gpgme_invalid_key_t *lastp;
} *op_data_t;


static void
release_op_data (void *hook)
{
  op_data_t opd = (op_data_t) hook;
  gpgme_invalid_key_t invalid_recipient = opd->result.invalid_recipients;

  while (invalid_recipient)
    {
      gpgme_invalid_key_t next = invalid_recipient->next;
      if (invalid_recipient->fpr)
	free (invalid_recipient->fpr);
      free (invalid_recipient);
      invalid_recipient = next;
    }
}


gpgme_encrypt_result_t
gpgme_op_encrypt_result (gpgme_ctx_t ctx)
{
  void *hook;
  op_data_t opd;
  gpgme_error_t err;

  TRACE_BEG (DEBUG_CTX, "gpgme_op_encrypt_result", ctx);

  err = _gpgme_op_data_lookup (ctx, OPDATA_ENCRYPT, &hook, -1, NULL);
  opd = hook;

  if (err || !opd)
    {
      TRACE_SUC0 ("result=(null)");
      return NULL;
    }

  if (_gpgme_debug_trace ())
    {
      gpgme_invalid_key_t invkeys = opd->result.invalid_recipients;
      int i = 0;

      while (invkeys)
	{
	  TRACE_LOG3 ("invalid_recipients[%i] = %s (%s)",
		      i, invkeys->fpr ? invkeys->fpr : "(null)",
		      gpg_strerror (invkeys->reason));
	  invkeys = invkeys->next;
	  i++;
	}
    }

  TRACE_SUC1 ("result=%p", &opd->result);
  return &opd->result;
}


gpgme_error_t
_gpgme_encrypt_status_handler (void *priv, gpgme_status_code_t code,
			       char *args)
{
  gpgme_ctx_t ctx = (gpgme_ctx_t) priv;
  gpgme_error_t err;
  void *hook;
  op_data_t opd;

  err = _gpgme_op_data_lookup (ctx, OPDATA_ENCRYPT, &hook, -1, NULL);
  opd = hook;
  if (err)
    return err;

  switch (code)
    {
    case GPGME_STATUS_EOF:
      if (opd->result.invalid_recipients)
	return gpg_error (GPG_ERR_UNUSABLE_PUBKEY);
      break;

    case GPGME_STATUS_INV_RECP:
      err = _gpgme_parse_inv_recp (args, opd->lastp);
      if (err)
	return err;

      opd->lastp = &(*opd->lastp)->next;
      break;

    case GPGME_STATUS_NO_RECP:
      /* Should not happen, because we require at least one recipient.  */
      return gpg_error (GPG_ERR_GENERAL);

    default:
      break;
    }
  return 0;
}


static gpgme_error_t
encrypt_sym_status_handler (void *priv, gpgme_status_code_t code, char *args)
{
  gpgme_error_t err;

  err = _gpgme_progress_status_handler (priv, code, args);
  if (!err)
    err = _gpgme_passphrase_status_handler (priv, code, args);
  return err;
}


static gpgme_error_t
encrypt_status_handler (void *priv, gpgme_status_code_t code, char *args)
{
  return _gpgme_progress_status_handler (priv, code, args)
    || _gpgme_encrypt_status_handler (priv, code, args);
}


gpgme_error_t
_gpgme_op_encrypt_init_result (gpgme_ctx_t ctx)
{
  gpgme_error_t err;
  void *hook;
  op_data_t opd;

  err = _gpgme_op_data_lookup (ctx, OPDATA_ENCRYPT, &hook, sizeof (*opd),
			       release_op_data);
  opd = hook;
  if (err)
    return err;

  opd->lastp = &opd->result.invalid_recipients;
  return 0;
}


static gpgme_error_t
encrypt_start (gpgme_ctx_t ctx, int synchronous, gpgme_key_t recp[],
	       gpgme_encrypt_flags_t flags,
	       gpgme_data_t plain, gpgme_data_t cipher)
{
  gpgme_error_t err;
  int symmetric = 0;

  err = _gpgme_op_reset (ctx, synchronous);
  if (err)
    return err;

  err = _gpgme_op_encrypt_init_result (ctx);
  if (err)
    return err;

  if (!recp)
    symmetric = 1;

  if (!plain)
    return gpg_error (GPG_ERR_NO_DATA);
  if (!cipher)
    return gpg_error (GPG_ERR_INV_VALUE);
  if (recp && ! *recp)
    return gpg_error (GPG_ERR_INV_VALUE);

  if (symmetric && ctx->passphrase_cb)
    {
      /* Symmetric encryption requires a passphrase.  */
      err = _gpgme_engine_set_command_handler
	(ctx->engine, _gpgme_passphrase_command_handler, ctx, NULL);
      if (err)
	return err;
    }

  _gpgme_engine_set_status_handler (ctx->engine,
				    symmetric
				    ? encrypt_sym_status_handler
				    : encrypt_status_handler,
				    ctx);

  return _gpgme_engine_op_encrypt (ctx->engine, recp, flags, plain, cipher,
				   ctx->use_armor);
}


gpgme_error_t
gpgme_op_encrypt_start (gpgme_ctx_t ctx, gpgme_key_t recp[],
			gpgme_encrypt_flags_t flags,
			gpgme_data_t plain, gpgme_data_t cipher)
{
  gpgme_error_t err;

  TRACE_BEG3 (DEBUG_CTX, "gpgme_op_encrypt_start", ctx,
	      "flags=0x%x, plain=%p, cipher=%p", flags, plain, cipher);

  if (!ctx)
    return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));

  if (_gpgme_debug_trace () && recp)
    {
      int i = 0;

      while (recp[i])
	{
	  TRACE_LOG3 ("recipient[%i] = %p (%s)", i, recp[i],
		      (recp[i]->subkeys && recp[i]->subkeys->fpr) ?
		      recp[i]->subkeys->fpr : "invalid");
	  i++;
	}
    }

  err = encrypt_start (ctx, 0, recp, flags, plain, cipher);
  return TRACE_ERR (err);
}


/* Encrypt plaintext PLAIN within CTX for the recipients RECP and
   store the resulting ciphertext in CIPHER.  */
gpgme_error_t
gpgme_op_encrypt (gpgme_ctx_t ctx, gpgme_key_t recp[],
		  gpgme_encrypt_flags_t flags,
		  gpgme_data_t plain, gpgme_data_t cipher)
{
  gpgme_error_t err;

  TRACE_BEG3 (DEBUG_CTX, "gpgme_op_encrypt", ctx,
	      "flags=0x%x, plain=%p, cipher=%p", flags, plain, cipher);

  if (!ctx)
    return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));

  if (_gpgme_debug_trace () && recp)
    {
      int i = 0;

      while (recp[i])
	{
	  TRACE_LOG3 ("recipient[%i] = %p (%s)", i, recp[i],
		      (recp[i]->subkeys && recp[i]->subkeys->fpr) ?
		      recp[i]->subkeys->fpr : "invalid");
	  i++;
	}
    }

  err = encrypt_start (ctx, 1, recp, flags, plain, cipher);
  if (!err)
    err = _gpgme_wait_one (ctx);
  return TRACE_ERR (err);
}