1 /*
2 * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
3 * Copyright (C) 1999-2016 the Claws Mail team
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #ifdef HAVE_CONFIG_H
20 # include "config.h"
21 #include "claws-features.h"
22 #endif
23
24 #ifdef USE_GPGME
25
26 #include "defs.h"
27 #include <glib.h>
28 #include <glib/gi18n.h>
29 #include <gpgme.h>
30 #include <ctype.h>
31 #include <errno.h>
32
33 #include "utils.h"
34 #include "privacy.h"
35 #include "procmime.h"
36 #include "plugin.h"
37
38 #include "pgpmime.h"
39 #include <plugins/pgpcore/sgpgme.h>
40 #include <plugins/pgpcore/prefs_gpg.h>
41 #include <plugins/pgpcore/passphrase.h>
42 #include <plugins/pgpcore/pgp_utils.h>
43
44 #include "prefs_common.h"
45 #include "file-utils.h"
46
47 typedef struct _PrivacyDataPGP PrivacyDataPGP;
48
49 struct _PrivacyDataPGP
50 {
51 PrivacyData data;
52
53 gboolean done_sigtest;
54 gboolean is_signed;
55 gpgme_verify_result_t sigstatus;
56 gpgme_ctx_t ctx;
57 };
58
59 static PrivacySystem pgpmime_system;
60
61 static gint pgpmime_check_signature(MimeInfo *mimeinfo);
62
pgpmime_new_privacydata()63 static PrivacyDataPGP *pgpmime_new_privacydata()
64 {
65 PrivacyDataPGP *data;
66 gpgme_error_t err;
67
68 data = g_new0(PrivacyDataPGP, 1);
69 data->data.system = &pgpmime_system;
70 data->done_sigtest = FALSE;
71 data->is_signed = FALSE;
72 data->sigstatus = NULL;
73 if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
74 g_warning("Couldn't initialize GPG context: %s", gpgme_strerror(err));
75 return NULL;
76 }
77
78 return data;
79 }
80
pgpmime_free_privacydata(PrivacyData * _data)81 static void pgpmime_free_privacydata(PrivacyData *_data)
82 {
83 PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
84 gpgme_release(data->ctx);
85 g_free(data);
86 }
87
pgpmime_is_signed(MimeInfo * mimeinfo)88 static gboolean pgpmime_is_signed(MimeInfo *mimeinfo)
89 {
90 MimeInfo *parent;
91 MimeInfo *signature;
92 const gchar *protocol;
93 PrivacyDataPGP *data = NULL;
94
95 cm_return_val_if_fail(mimeinfo != NULL, FALSE);
96 if (mimeinfo->privacy != NULL) {
97 data = (PrivacyDataPGP *) mimeinfo->privacy;
98 if (data->done_sigtest)
99 return data->is_signed;
100 }
101
102 /* check parent */
103 parent = procmime_mimeinfo_parent(mimeinfo);
104 if (parent == NULL)
105 return FALSE;
106 if ((parent->type != MIMETYPE_MULTIPART) ||
107 g_ascii_strcasecmp(parent->subtype, "signed"))
108 return FALSE;
109 protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
110 if ((protocol == NULL) ||
111 (g_ascii_strcasecmp(protocol, "application/pgp-signature")))
112 return FALSE;
113
114 /* check if mimeinfo is the first child */
115 if (parent->node->children->data != mimeinfo)
116 return FALSE;
117
118 /* check signature */
119 signature = parent->node->children->next != NULL ?
120 (MimeInfo *) parent->node->children->next->data : NULL;
121 if (signature == NULL)
122 return FALSE;
123 if ((signature->type != MIMETYPE_APPLICATION) ||
124 (g_ascii_strcasecmp(signature->subtype, "pgp-signature")))
125 return FALSE;
126
127 if (data == NULL) {
128 data = pgpmime_new_privacydata();
129 mimeinfo->privacy = (PrivacyData *) data;
130 }
131 if (data != NULL) {
132 data->done_sigtest = TRUE;
133 data->is_signed = TRUE;
134 }
135
136 return TRUE;
137 }
138
get_canonical_content(FILE * fp,const gchar * boundary)139 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
140 {
141 gchar *ret;
142 GString *textbuffer;
143 guint boundary_len;
144 gchar buf[BUFFSIZE];
145
146 boundary_len = strlen(boundary);
147 while (claws_fgets(buf, sizeof(buf), fp) != NULL)
148 if (IS_BOUNDARY(buf, boundary, boundary_len))
149 break;
150
151 textbuffer = g_string_new("");
152 while (claws_fgets(buf, sizeof(buf), fp) != NULL) {
153 gchar *buf2;
154
155 if (IS_BOUNDARY(buf, boundary, boundary_len))
156 break;
157
158 buf2 = canonicalize_str(buf);
159 g_string_append(textbuffer, buf2);
160 g_free(buf2);
161 }
162 g_string_truncate(textbuffer, textbuffer->len - 2);
163
164 ret = textbuffer->str;
165 g_string_free(textbuffer, FALSE);
166
167 return ret;
168 }
169
pgpmime_check_signature(MimeInfo * mimeinfo)170 static gint pgpmime_check_signature(MimeInfo *mimeinfo)
171 {
172 PrivacyDataPGP *data;
173 MimeInfo *parent, *signature;
174 FILE *fp;
175 gchar *boundary;
176 gchar *textstr;
177 gpgme_data_t sigdata = NULL, textdata = NULL;
178 gpgme_error_t err;
179 cm_return_val_if_fail(mimeinfo != NULL, -1);
180 cm_return_val_if_fail(mimeinfo->privacy != NULL, -1);
181 data = (PrivacyDataPGP *) mimeinfo->privacy;
182 if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
183 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
184 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
185 return 0;
186 }
187
188
189 debug_print("Checking PGP/MIME signature\n");
190
191 err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_OpenPGP);
192
193 if (err) {
194 debug_print ("gpgme_set_protocol failed: %s\n",
195 gpgme_strerror (err));
196 }
197 parent = procmime_mimeinfo_parent(mimeinfo);
198
199 fp = claws_fopen(parent->data.filename, "rb");
200 cm_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
201
202 boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
203 if (!boundary) {
204 privacy_set_error(_("Signature boundary not found."));
205 claws_fclose(fp);
206 return 0;
207 }
208 textstr = get_canonical_content(fp, boundary);
209
210 err = gpgme_data_new_from_mem(&textdata, textstr, (size_t)strlen(textstr), 0);
211 if (err) {
212 debug_print ("gpgme_data_new_from_mem failed: %s\n",
213 gpgme_strerror (err));
214 }
215 signature = (MimeInfo *) mimeinfo->node->next->data;
216 sigdata = sgpgme_data_from_mimeinfo(signature);
217
218 err = 0;
219 if (signature->encoding_type == ENC_BASE64) {
220 err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
221 }
222
223 if (err) {
224 debug_print ("gpgme_data_set_encoding failed: %s\n",
225 gpgme_strerror (err));
226 }
227
228 data->sigstatus =
229 sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
230
231 gpgme_data_release(sigdata);
232 gpgme_data_release(textdata);
233 g_free(textstr);
234 claws_fclose(fp);
235
236 return 0;
237 }
238
pgpmime_get_sig_status(MimeInfo * mimeinfo)239 static SignatureStatus pgpmime_get_sig_status(MimeInfo *mimeinfo)
240 {
241 PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
242
243 cm_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
244
245 return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
246 }
247
pgpmime_get_sig_info_short(MimeInfo * mimeinfo)248 static gchar *pgpmime_get_sig_info_short(MimeInfo *mimeinfo)
249 {
250 PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
251
252 cm_return_val_if_fail(data != NULL, g_strdup("Error"));
253
254 return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
255 }
256
pgpmime_get_sig_info_full(MimeInfo * mimeinfo)257 static gchar *pgpmime_get_sig_info_full(MimeInfo *mimeinfo)
258 {
259 PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
260
261 cm_return_val_if_fail(data != NULL, g_strdup("Error"));
262
263 return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
264 }
265
pgpmime_is_encrypted(MimeInfo * mimeinfo)266 static gboolean pgpmime_is_encrypted(MimeInfo *mimeinfo)
267 {
268 MimeInfo *tmpinfo;
269 const gchar *tmpstr;
270 const gchar *begin_indicator = "-----BEGIN PGP MESSAGE-----";
271 const gchar *end_indicator = "-----END PGP MESSAGE-----";
272 gchar *textdata;
273
274 if (mimeinfo->type != MIMETYPE_MULTIPART)
275 return FALSE;
276 if (g_ascii_strcasecmp(mimeinfo->subtype, "encrypted"))
277 return FALSE;
278 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "protocol");
279 if ((tmpstr == NULL) || g_ascii_strcasecmp(tmpstr, "application/pgp-encrypted"))
280 return FALSE;
281 if (g_node_n_children(mimeinfo->node) != 2)
282 return FALSE;
283
284 tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 0)->data;
285 if (tmpinfo->type != MIMETYPE_APPLICATION)
286 return FALSE;
287 if (g_ascii_strcasecmp(tmpinfo->subtype, "pgp-encrypted"))
288 return FALSE;
289
290 tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
291 if (tmpinfo->type != MIMETYPE_APPLICATION)
292 return FALSE;
293 if (g_ascii_strcasecmp(tmpinfo->subtype, "octet-stream"))
294 return FALSE;
295
296 textdata = procmime_get_part_as_string(tmpinfo, TRUE);
297 if (!textdata)
298 return FALSE;
299
300 if (!pgp_locate_armor_header(textdata, begin_indicator)) {
301 g_free(textdata);
302 return FALSE;
303 }
304 if (!pgp_locate_armor_header(textdata, end_indicator)) {
305 g_free(textdata);
306 return FALSE;
307 }
308
309 g_free(textdata);
310
311 return TRUE;
312 }
313
pgpmime_decrypt(MimeInfo * mimeinfo)314 static MimeInfo *pgpmime_decrypt(MimeInfo *mimeinfo)
315 {
316 MimeInfo *encinfo, *decinfo, *parseinfo;
317 gpgme_data_t cipher = NULL, plain = NULL;
318 static gint id = 0;
319 FILE *dstfp;
320 gchar *fname;
321 gpgme_verify_result_t sigstat = NULL;
322 PrivacyDataPGP *data = NULL;
323 gpgme_ctx_t ctx;
324 gchar *chars;
325 size_t len;
326 gpgme_error_t err;
327
328 if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
329 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
330 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
331 return NULL;
332 }
333
334 cm_return_val_if_fail(pgpmime_is_encrypted(mimeinfo), NULL);
335
336 encinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
337
338 cipher = sgpgme_data_from_mimeinfo(encinfo);
339 plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
340
341 gpgme_data_release(cipher);
342 if (plain == NULL) {
343 debug_print("plain is null!\n");
344 gpgme_release(ctx);
345 return NULL;
346 }
347
348 fname = g_strdup_printf("%s%cplaintext.%08x",
349 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
350
351 if ((dstfp = claws_fopen(fname, "wb")) == NULL) {
352 FILE_OP_ERROR(fname, "claws_fopen");
353 privacy_set_error(_("Couldn't open decrypted file %s"), fname);
354 g_free(fname);
355 gpgme_data_release(plain);
356 gpgme_release(ctx);
357 debug_print("can't open!\n");
358 return NULL;
359 }
360
361 if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
362 FILE_OP_ERROR(fname, "fprintf");
363 claws_fclose(dstfp);
364 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
365 g_free(fname);
366 gpgme_data_release(plain);
367 gpgme_release(ctx);
368 debug_print("can't open!\n");
369 return NULL;
370 }
371
372 chars = sgpgme_data_release_and_get_mem(plain, &len);
373 if (len > 0) {
374 if (claws_fwrite(chars, 1, len, dstfp) < len) {
375 FILE_OP_ERROR(fname, "claws_fwrite");
376 g_free(chars);
377 claws_fclose(dstfp);
378 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
379 g_free(fname);
380 gpgme_data_release(plain);
381 gpgme_release(ctx);
382 debug_print("can't open!\n");
383 return NULL;
384 }
385 }
386 g_free(chars);
387
388 if (claws_safe_fclose(dstfp) == EOF) {
389 FILE_OP_ERROR(fname, "claws_fclose");
390 privacy_set_error(_("Couldn't close decrypted file %s"), fname);
391 g_free(fname);
392 gpgme_data_release(plain);
393 gpgme_release(ctx);
394 debug_print("can't open!\n");
395 return NULL;
396 }
397
398 parseinfo = procmime_scan_file(fname);
399 g_free(fname);
400 if (parseinfo == NULL) {
401 gpgme_release(ctx);
402 privacy_set_error(_("Couldn't parse decrypted file."));
403 return NULL;
404 }
405 decinfo = g_node_first_child(parseinfo->node) != NULL ?
406 g_node_first_child(parseinfo->node)->data : NULL;
407 if (decinfo == NULL) {
408 privacy_set_error(_("Couldn't parse decrypted file parts."));
409 gpgme_release(ctx);
410 return NULL;
411 }
412
413 g_node_unlink(decinfo->node);
414 procmime_mimeinfo_free_all(&parseinfo);
415
416 decinfo->tmp = TRUE;
417
418 if (sigstat != NULL && sigstat->signatures != NULL) {
419 if (decinfo->privacy != NULL) {
420 data = (PrivacyDataPGP *) decinfo->privacy;
421 } else {
422 data = pgpmime_new_privacydata();
423 decinfo->privacy = (PrivacyData *) data;
424 }
425 if (data != NULL) {
426 data->done_sigtest = TRUE;
427 data->is_signed = TRUE;
428 data->sigstatus = sigstat;
429 if (data->ctx)
430 gpgme_release(data->ctx);
431 data->ctx = ctx;
432 }
433 } else
434 gpgme_release(ctx);
435
436 return decinfo;
437 }
438
pgpmime_sign(MimeInfo * mimeinfo,PrefsAccount * account,const gchar * from_addr)439 gboolean pgpmime_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
440 {
441 MimeInfo *msgcontent, *sigmultipart, *newinfo;
442 gchar *textstr, *micalg = NULL;
443 FILE *fp;
444 gchar *boundary = NULL;
445 gchar *sigcontent;
446 gpgme_ctx_t ctx;
447 gpgme_data_t gpgtext, gpgsig;
448 gpgme_error_t err;
449 size_t len;
450 struct passphrase_cb_info_s info;
451 gpgme_sign_result_t result = NULL;
452 gchar *test_msg;
453
454 fp = my_tmpfile();
455 if (fp == NULL) {
456 perror("my_tmpfile");
457 privacy_set_error(_("Couldn't create temporary file: %s"), g_strerror(errno));
458 return FALSE;
459 }
460 procmime_write_mimeinfo(mimeinfo, fp);
461 rewind(fp);
462
463 /* read temporary file into memory */
464 test_msg = file_read_stream_to_str(fp);
465 claws_fclose(fp);
466
467 memset (&info, 0, sizeof info);
468
469 /* remove content node from message */
470 msgcontent = (MimeInfo *) mimeinfo->node->children->data;
471 g_node_unlink(msgcontent->node);
472
473 /* create temporary multipart for content */
474 sigmultipart = procmime_mimeinfo_new();
475 sigmultipart->type = MIMETYPE_MULTIPART;
476 sigmultipart->subtype = g_strdup("signed");
477
478 do {
479 g_free(boundary);
480 boundary = generate_mime_boundary("Sig");
481 } while (strstr(test_msg, boundary) != NULL);
482
483 g_free(test_msg);
484
485 g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
486 g_strdup(boundary));
487 g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
488 g_strdup("application/pgp-signature"));
489 g_node_append(sigmultipart->node, msgcontent->node);
490 g_node_append(mimeinfo->node, sigmultipart->node);
491
492 /* write message content to temporary file */
493 fp = my_tmpfile();
494 if (fp == NULL) {
495 perror("my_tmpfile");
496 privacy_set_error(_("Couldn't create temporary file: %s"), g_strerror(errno));
497 return FALSE;
498 }
499 procmime_write_mimeinfo(sigmultipart, fp);
500 rewind(fp);
501
502 /* read temporary file into memory */
503 textstr = get_canonical_content(fp, boundary);
504
505 g_free(boundary);
506 claws_fclose(fp);
507
508 gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
509 gpgme_data_new(&gpgsig);
510 if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
511 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
512 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
513 return FALSE;
514 }
515 gpgme_set_textmode(ctx, 1);
516 gpgme_set_armor(ctx, 1);
517 gpgme_signers_clear (ctx);
518
519 if (!sgpgme_setup_signers(ctx, account, from_addr)) {
520 gpgme_release(ctx);
521 return FALSE;
522 }
523
524 prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
525 if (g_getenv("GPG_AGENT_INFO") && prefs_gpg_get_config()->use_gpg_agent) {
526 debug_print("GPG_AGENT_INFO environment defined, running without passphrase callback\n");
527 } else {
528 info.c = ctx;
529 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
530 }
531
532 err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
533 if (err != GPG_ERR_NO_ERROR) {
534 if (err == GPG_ERR_CANCELED) {
535 /* ignore cancelled signing */
536 privacy_reset_error();
537 debug_print("gpgme_op_sign cancelled\n");
538 } else {
539 privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
540 debug_print("gpgme_op_sign error : %x\n", err);
541 }
542 gpgme_release(ctx);
543 return FALSE;
544 }
545 result = gpgme_op_sign_result(ctx);
546 if (result && result->signatures) {
547 gpgme_new_signature_t sig = result->signatures;
548 if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
549 gchar *down_algo = g_ascii_strdown(gpgme_hash_algo_name(
550 result->signatures->hash_algo), -1);
551 micalg = g_strdup_printf("pgp-%s", down_algo);
552 g_free(down_algo);
553 } else {
554 micalg = g_strdup(gpgme_hash_algo_name(
555 result->signatures->hash_algo));
556 }
557 while (sig) {
558 debug_print("valid signature: %s\n", sig->fpr);
559 sig = sig->next;
560 }
561 } else if (result && result->invalid_signers) {
562 gpgme_invalid_key_t invalid = result->invalid_signers;
563 while (invalid) {
564 g_warning("invalid signer: %s (%s)", invalid->fpr,
565 gpgme_strerror(invalid->reason));
566 privacy_set_error(_("Data signing failed due to invalid signer: %s"),
567 gpgme_strerror(invalid->reason));
568 invalid = invalid->next;
569 }
570 gpgme_release(ctx);
571 return FALSE;
572 } else {
573 /* can't get result (maybe no signing key?) */
574 debug_print("gpgme_op_sign_result error\n");
575 privacy_set_error(_("Data signing failed, no results."));
576 gpgme_release(ctx);
577 return FALSE;
578 }
579
580 sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
581 gpgme_data_release(gpgtext);
582 g_free(textstr);
583
584 if (sigcontent == NULL || len <= 0) {
585 g_warning("sgpgme_data_release_and_get_mem failed");
586 privacy_set_error(_("Data signing failed, no contents."));
587 g_free(micalg);
588 g_free(sigcontent);
589 return FALSE;
590 }
591
592 /* add signature */
593 g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
594 micalg);
595
596 newinfo = procmime_mimeinfo_new();
597 newinfo->type = MIMETYPE_APPLICATION;
598 newinfo->subtype = g_strdup("pgp-signature");
599 newinfo->description = g_strdup(_("OpenPGP digital signature"));
600 newinfo->content = MIMECONTENT_MEM;
601 newinfo->data.mem = g_malloc(len + 1);
602 memmove(newinfo->data.mem, sigcontent, len);
603 newinfo->data.mem[len] = '\0';
604 newinfo->tmp = TRUE;
605 g_node_append(sigmultipart->node, newinfo->node);
606
607 g_free(sigcontent);
608 gpgme_release(ctx);
609
610 return TRUE;
611 }
pgpmime_get_encrypt_data(GSList * recp_names)612 gchar *pgpmime_get_encrypt_data(GSList *recp_names)
613 {
614 return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
615 }
616
pgpmime_get_encrypt_warning(void)617 static const gchar *pgpmime_get_encrypt_warning(void)
618 {
619 if (prefs_gpg_should_skip_encryption_warning(pgpmime_system.id))
620 return NULL;
621 else
622 return _("Please note that email headers, like Subject, "
623 "are not encrypted by the PGP/Mime system.");
624 }
625
pgpmime_inhibit_encrypt_warning(gboolean inhibit)626 static void pgpmime_inhibit_encrypt_warning(gboolean inhibit)
627 {
628 if (inhibit)
629 prefs_gpg_add_skip_encryption_warning(pgpmime_system.id);
630 else
631 prefs_gpg_remove_skip_encryption_warning(pgpmime_system.id);
632 }
633
pgpmime_encrypt(MimeInfo * mimeinfo,const gchar * encrypt_data)634 gboolean pgpmime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
635 {
636 MimeInfo *msgcontent, *encmultipart, *newinfo;
637 FILE *fp;
638 gchar *boundary, *enccontent;
639 size_t len;
640 gchar *textstr;
641 gpgme_data_t gpgtext = NULL, gpgenc = NULL;
642 gpgme_ctx_t ctx = NULL;
643 gpgme_key_t *kset = NULL;
644 gchar **fprs = g_strsplit(encrypt_data, " ", -1);
645 gint i = 0;
646 gpgme_error_t err;
647
648 while (fprs[i] && strlen(fprs[i])) {
649 i++;
650 }
651
652 kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
653 memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
654 if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
655 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
656 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
657 g_free(kset);
658 return FALSE;
659 }
660 i = 0;
661 while (fprs[i] && strlen(fprs[i])) {
662 gpgme_key_t key;
663 err = gpgme_get_key(ctx, fprs[i], &key, 0);
664 if (err) {
665 debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
666 privacy_set_error(_("Couldn't add GPG key %s, %s"), fprs[i], gpgme_strerror(err));
667 g_free(kset);
668 return FALSE;
669 }
670 debug_print("found %s at %d\n", fprs[i], i);
671 kset[i] = key;
672 i++;
673 }
674
675 debug_print("Encrypting message content\n");
676
677 /* remove content node from message */
678 msgcontent = (MimeInfo *) mimeinfo->node->children->data;
679 g_node_unlink(msgcontent->node);
680
681 /* create temporary multipart for content */
682 encmultipart = procmime_mimeinfo_new();
683 encmultipart->type = MIMETYPE_MULTIPART;
684 encmultipart->subtype = g_strdup("encrypted");
685 boundary = generate_mime_boundary("Encrypt");
686 g_hash_table_insert(encmultipart->typeparameters, g_strdup("boundary"),
687 g_strdup(boundary));
688 g_hash_table_insert(encmultipart->typeparameters, g_strdup("protocol"),
689 g_strdup("application/pgp-encrypted"));
690 g_node_append(encmultipart->node, msgcontent->node);
691
692 /* write message content to temporary file */
693 fp = my_tmpfile();
694 if (fp == NULL) {
695 perror("my_tmpfile");
696 privacy_set_error(_("Couldn't create temporary file, %s"), g_strerror(errno));
697 g_free(kset);
698 return FALSE;
699 }
700 procmime_write_mimeinfo(encmultipart, fp);
701 rewind(fp);
702
703 /* read temporary file into memory */
704 textstr = get_canonical_content(fp, boundary);
705
706 g_free(boundary);
707 claws_fclose(fp);
708
709 /* encrypt data */
710 gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
711 gpgme_data_new(&gpgenc);
712 gpgme_set_armor(ctx, 1);
713 cm_gpgme_data_rewind(gpgtext);
714
715 err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
716
717 enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
718 gpgme_data_release(gpgtext);
719 g_free(textstr);
720 g_free(kset);
721
722 if (enccontent == NULL || len <= 0) {
723 g_warning("sgpgme_data_release_and_get_mem failed");
724 privacy_set_error(_("Encryption failed, %s"), gpgme_strerror(err));
725 gpgme_release(ctx);
726 g_free(enccontent);
727 return FALSE;
728 }
729
730 /* create encrypted multipart */
731 g_node_unlink(msgcontent->node);
732 procmime_mimeinfo_free_all(&msgcontent);
733 g_node_append(mimeinfo->node, encmultipart->node);
734
735 newinfo = procmime_mimeinfo_new();
736 newinfo->type = MIMETYPE_APPLICATION;
737 newinfo->subtype = g_strdup("pgp-encrypted");
738 newinfo->content = MIMECONTENT_MEM;
739 newinfo->data.mem = g_strdup("Version: 1\n");
740 newinfo->tmp = TRUE;
741 g_node_append(encmultipart->node, newinfo->node);
742
743 newinfo = procmime_mimeinfo_new();
744 newinfo->type = MIMETYPE_APPLICATION;
745 newinfo->subtype = g_strdup("octet-stream");
746 newinfo->content = MIMECONTENT_MEM;
747 newinfo->data.mem = g_malloc(len + 1);
748 newinfo->tmp = TRUE;
749 memmove(newinfo->data.mem, enccontent, len);
750 newinfo->data.mem[len] = '\0';
751 g_node_append(encmultipart->node, newinfo->node);
752
753 g_free(enccontent);
754 gpgme_release(ctx);
755
756 return TRUE;
757 }
758
759 static PrivacySystem pgpmime_system = {
760 "pgpmime", /* id */
761 "PGP MIME", /* name */
762
763 pgpmime_free_privacydata, /* free_privacydata */
764
765 pgpmime_is_signed, /* is_signed(MimeInfo *) */
766 pgpmime_check_signature, /* check_signature(MimeInfo *) */
767 pgpmime_get_sig_status, /* get_sig_status(MimeInfo *) */
768 pgpmime_get_sig_info_short, /* get_sig_info_short(MimeInfo *) */
769 pgpmime_get_sig_info_full, /* get_sig_info_full(MimeInfo *) */
770
771 pgpmime_is_encrypted, /* is_encrypted(MimeInfo *) */
772 pgpmime_decrypt, /* decrypt(MimeInfo *) */
773
774 TRUE,
775 pgpmime_sign,
776
777 TRUE,
778 pgpmime_get_encrypt_data,
779 pgpmime_encrypt,
780 pgpmime_get_encrypt_warning,
781 pgpmime_inhibit_encrypt_warning,
782 prefs_gpg_auto_check_signatures,
783 };
784
pgpmime_init()785 void pgpmime_init()
786 {
787 privacy_register_system(&pgpmime_system);
788 }
789
pgpmime_done()790 void pgpmime_done()
791 {
792 privacy_unregister_system(&pgpmime_system);
793 }
794
plugin_provides(void)795 struct PluginFeature *plugin_provides(void)
796 {
797 static struct PluginFeature features[] =
798 { {PLUGIN_PRIVACY, N_("PGP/Mime")},
799 {PLUGIN_NOTHING, NULL}};
800 return features;
801 }
802 #endif /* USE_GPGME */
803