1 /*
2 * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
3 * Copyright (C) 1999-2016 Colin Leroy and 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 <gpgme.h>
29 #include <ctype.h>
30 #include <glib/gi18n.h>
31
32 #include "utils.h"
33 #include "privacy.h"
34 #include "procmime.h"
35
36 #include "smime.h"
37 #include <plugins/pgpcore/sgpgme.h>
38 #include <plugins/pgpcore/prefs_gpg.h>
39 #include <plugins/pgpcore/pgp_utils.h>
40 #include <plugins/pgpcore/passphrase.h>
41
42 #include "alertpanel.h"
43 #include "prefs_common.h"
44 #include "procmime.h"
45 #include "plugin.h"
46 #include "file-utils.h"
47
48 typedef struct _PrivacyDataPGP PrivacyDataPGP;
49
50 struct _PrivacyDataPGP
51 {
52 PrivacyData data;
53
54 gboolean done_sigtest;
55 gboolean is_signed;
56 gpgme_verify_result_t sigstatus;
57 gpgme_ctx_t ctx;
58 };
59
60 static PrivacySystem smime_system;
61
62 static gint smime_check_signature(MimeInfo *mimeinfo);
63
smime_new_privacydata()64 static PrivacyDataPGP *smime_new_privacydata()
65 {
66 PrivacyDataPGP *data;
67 gpgme_ctx_t ctx;
68
69 if (gpgme_new(&ctx) != GPG_ERR_NO_ERROR) {
70 debug_print("gpgme_new failed\n");
71 return NULL;
72 }
73
74 data = g_new0(PrivacyDataPGP, 1);
75 data->data.system = &smime_system;
76 data->done_sigtest = FALSE;
77 data->is_signed = FALSE;
78 data->sigstatus = NULL;
79 data->ctx = ctx;
80
81 return data;
82 }
83
smime_free_privacydata(PrivacyData * _data)84 static void smime_free_privacydata(PrivacyData *_data)
85 {
86 PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
87 gpgme_release(data->ctx);
88 g_free(data);
89 }
90
smime_is_signed(MimeInfo * mimeinfo)91 static gboolean smime_is_signed(MimeInfo *mimeinfo)
92 {
93 MimeInfo *parent;
94 MimeInfo *signature;
95 const gchar *protocol, *tmpstr;
96 PrivacyDataPGP *data = NULL;
97
98 cm_return_val_if_fail(mimeinfo != NULL, FALSE);
99 if (mimeinfo->privacy != NULL) {
100 data = (PrivacyDataPGP *) mimeinfo->privacy;
101 if (data->done_sigtest)
102 return data->is_signed;
103 }
104
105 if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime") ||
106 !g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
107 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
108 if (tmpstr && !g_ascii_strcasecmp(tmpstr, "signed-data")) {
109 if (data == NULL) {
110 data = smime_new_privacydata();
111 if (!data)
112 return FALSE;
113 mimeinfo->privacy = (PrivacyData *) data;
114 }
115
116 data->done_sigtest = TRUE;
117 data->is_signed = TRUE;
118 smime_check_signature(mimeinfo);
119 return TRUE;
120 }
121 }
122
123 /* check parent */
124 parent = procmime_mimeinfo_parent(mimeinfo);
125 if (parent == NULL)
126 return FALSE;
127
128 if ((parent->type != MIMETYPE_MULTIPART) ||
129 g_ascii_strcasecmp(parent->subtype, "signed"))
130 return FALSE;
131 protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
132 if ((protocol == NULL) ||
133 (g_ascii_strcasecmp(protocol, "application/pkcs7-signature") &&
134 g_ascii_strcasecmp(protocol, "application/x-pkcs7-signature")))
135 return FALSE;
136
137 /* check if mimeinfo is the first child */
138 if (parent->node->children->data != mimeinfo)
139 return FALSE;
140
141
142 /* check signature */
143 signature = parent->node->children->next != NULL ?
144 (MimeInfo *) parent->node->children->next->data : NULL;
145 if (signature == NULL)
146 return FALSE;
147 if ((signature->type != MIMETYPE_APPLICATION) ||
148 (g_ascii_strcasecmp(signature->subtype, "pkcs7-signature") &&
149 g_ascii_strcasecmp(signature->subtype, "x-pkcs7-signature")))
150 return FALSE;
151
152 if (data == NULL) {
153 data = smime_new_privacydata();
154 if (!data)
155 return FALSE;
156 mimeinfo->privacy = (PrivacyData *) data;
157 }
158
159 data->done_sigtest = TRUE;
160 data->is_signed = TRUE;
161
162 return TRUE;
163 }
164
get_canonical_content(FILE * fp,const gchar * boundary)165 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
166 {
167 gchar *ret;
168 GString *textbuffer;
169 guint boundary_len = 0;
170 gchar buf[BUFFSIZE];
171
172 if (boundary) {
173 boundary_len = strlen(boundary);
174 while (claws_fgets(buf, sizeof(buf), fp) != NULL)
175 if (IS_BOUNDARY(buf, boundary, boundary_len))
176 break;
177 }
178
179 textbuffer = g_string_new("");
180 while (claws_fgets(buf, sizeof(buf), fp) != NULL) {
181 gchar *buf2;
182
183 if (boundary && IS_BOUNDARY(buf, boundary, boundary_len))
184 break;
185
186 buf2 = canonicalize_str(buf);
187 g_string_append(textbuffer, buf2);
188 g_free(buf2);
189 }
190 g_string_truncate(textbuffer, textbuffer->len - 2);
191
192 ret = textbuffer->str;
193 g_string_free(textbuffer, FALSE);
194
195 return ret;
196 }
197
smime_check_signature(MimeInfo * mimeinfo)198 static gint smime_check_signature(MimeInfo *mimeinfo)
199 {
200 PrivacyDataPGP *data;
201 MimeInfo *parent, *signature;
202 FILE *fp;
203 gchar *boundary;
204 gchar *textstr = NULL;
205 const gchar *tmpstr;
206 gpgme_data_t sigdata = NULL, textdata = NULL;
207 gpgme_error_t err;
208 EncodingType oldenc = ENC_BINARY;
209
210 cm_return_val_if_fail(mimeinfo != NULL, -1);
211 cm_return_val_if_fail(mimeinfo->privacy != NULL, -1);
212
213 data = (PrivacyDataPGP *) mimeinfo->privacy;
214
215 if (!data->ctx) {
216 if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
217 debug_print("gpgme_new failed: %s\n",
218 gpgme_strerror(err));
219 return -1;
220 }
221 }
222
223 debug_print("Checking S/MIME signature\n");
224
225 err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_CMS);
226
227 if (err) {
228 debug_print ("gpgme_set_protocol failed: %s\n",
229 gpgme_strerror (err));
230 }
231 parent = procmime_mimeinfo_parent(mimeinfo);
232
233 fp = claws_fopen(parent->data.filename, "rb");
234 cm_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
235
236 boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
237 if (!boundary) {
238 gchar *tmpfile = get_tmp_file();
239 debug_print("no boundary\n");
240 if (tmpfile) {
241 if (mimeinfo->encoding_type != ENC_BASE64) {
242 procmime_encode_content(mimeinfo, ENC_BASE64);
243 }
244 oldenc = mimeinfo->encoding_type;
245 if (mimeinfo->encoding_type == ENC_BASE64)
246 mimeinfo->encoding_type = ENC_BINARY;
247 if (procmime_get_part(tmpfile, mimeinfo) == 0) {
248 textstr = file_read_to_str(tmpfile);
249 } else {
250 textstr = NULL;
251 }
252 if (mimeinfo->encoding_type != oldenc)
253 mimeinfo->encoding_type = oldenc;
254 }
255 g_free(tmpfile);
256 } else {
257 textstr = get_canonical_content(fp, boundary);
258 }
259 err = gpgme_data_new_from_mem(&textdata, textstr, textstr?strlen(textstr):0, 0);
260
261 if (err) {
262 debug_print ("gpgme_data_new_from_mem failed: %s\n",
263 gpgme_strerror (err));
264 }
265
266 if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime") ||
267 !g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
268 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
269 if (tmpstr && !g_ascii_strcasecmp(tmpstr, "signed-data")) {
270 gpgme_data_t cipher;
271 size_t len;
272 if (oldenc == ENC_BASE64)
273 gpgme_data_set_encoding (textdata, GPGME_DATA_ENCODING_BASE64);
274 gpgme_data_new(&cipher);
275 data->sigstatus =
276 sgpgme_verify_signature (data->ctx, textdata, NULL, cipher);
277 gpgme_data_release(textdata);
278 g_free(textstr);
279 cm_gpgme_data_rewind(cipher);
280 textstr = sgpgme_data_release_and_get_mem(cipher, &len);
281 claws_fclose(fp);
282 if (textstr && len > 0)
283 textstr[len-1]='\0';
284
285 if (textstr && len) {
286 gchar *tmp_file = get_tmp_file();
287 MimeInfo *newinfo = NULL, *decinfo = NULL, *parentinfo = NULL;
288
289 str_write_to_file(textstr, tmp_file, TRUE);
290 newinfo = procmime_scan_file(tmp_file);
291 decinfo = g_node_first_child(newinfo->node) != NULL ?
292 g_node_first_child(newinfo->node)->data : NULL;
293
294 if (decinfo == NULL) {
295 g_free(textstr);
296 return -1;
297 }
298
299 g_node_unlink(decinfo->node);
300 procmime_mimeinfo_free_all(&newinfo);
301 decinfo->tmp = TRUE;
302 parentinfo = procmime_mimeinfo_parent(mimeinfo);
303
304 if (parentinfo->type == MIMETYPE_MESSAGE &&
305 !strcmp(parentinfo->subtype, "rfc822")) {
306 procmime_decode_content(parentinfo);
307 procmime_encode_content(parentinfo, ENC_BASE64);
308 procmime_encode_content(parentinfo, ENC_8BIT);
309 if (parentinfo->content == MIMECONTENT_MEM) {
310 gint newlen =
311 (gint)(strstr(parentinfo->data.mem, "\n\n") - parentinfo->data.mem);
312 if (newlen > 0)
313 parentinfo->length = newlen;
314 }
315 }
316 g_node_prepend(parentinfo->node, decinfo->node);
317 g_free(textstr);
318 return 0;
319 } else {
320 if (textstr)
321 g_free(textstr);
322 return -1;
323 }
324 }
325 }
326
327 signature = (MimeInfo *) mimeinfo->node->next->data;
328 sigdata = sgpgme_data_from_mimeinfo(signature);
329
330 err = 0;
331 if (signature->encoding_type == ENC_BASE64) {
332 err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
333 }
334
335 if (err) {
336 debug_print ("gpgme_data_set_encoding failed: %s\n",
337 gpgme_strerror (err));
338 }
339
340 data->sigstatus =
341 sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
342
343 gpgme_data_release(sigdata);
344 gpgme_data_release(textdata);
345 g_free(textstr);
346 claws_fclose(fp);
347
348 return 0;
349 }
350
smime_get_sig_status(MimeInfo * mimeinfo)351 static SignatureStatus smime_get_sig_status(MimeInfo *mimeinfo)
352 {
353 PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
354
355 cm_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
356
357 return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
358 }
359
smime_get_sig_info_short(MimeInfo * mimeinfo)360 static gchar *smime_get_sig_info_short(MimeInfo *mimeinfo)
361 {
362 PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
363
364 cm_return_val_if_fail(data != NULL, g_strdup("Error"));
365
366 return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
367 }
368
smime_get_sig_info_full(MimeInfo * mimeinfo)369 static gchar *smime_get_sig_info_full(MimeInfo *mimeinfo)
370 {
371 PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
372
373 cm_return_val_if_fail(data != NULL, g_strdup("Error"));
374
375 return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
376 }
377
smime_is_encrypted(MimeInfo * mimeinfo)378 static gboolean smime_is_encrypted(MimeInfo *mimeinfo)
379 {
380 const gchar *tmpstr;
381
382 if (mimeinfo->type != MIMETYPE_APPLICATION)
383 return FALSE;
384 if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime")) {
385 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
386 if (tmpstr && g_ascii_strcasecmp(tmpstr, "enveloped-data"))
387 return FALSE;
388 else
389 return TRUE;
390
391 } else if (!g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
392 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
393 if (tmpstr && g_ascii_strcasecmp(tmpstr, "enveloped-data"))
394 return FALSE;
395 else
396 return TRUE;
397 }
398 return FALSE;
399 }
400
smime_decrypt(MimeInfo * mimeinfo)401 static MimeInfo *smime_decrypt(MimeInfo *mimeinfo)
402 {
403 MimeInfo *encinfo, *decinfo, *parseinfo;
404 gpgme_data_t cipher = NULL, plain = NULL;
405 static gint id = 0;
406 FILE *dstfp;
407 gchar *fname;
408 gpgme_verify_result_t sigstat = NULL;
409 PrivacyDataPGP *data = NULL;
410 gpgme_ctx_t ctx;
411 gpgme_error_t err;
412 gchar *chars;
413 size_t len;
414
415 cm_return_val_if_fail(smime_is_encrypted(mimeinfo), NULL);
416
417 if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
418 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
419 return NULL;
420 }
421
422 err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
423 if (err) {
424 debug_print ("gpgme_set_protocol failed: %s\n",
425 gpgme_strerror (err));
426 privacy_set_error(_("Couldn't set GPG protocol, %s"), gpgme_strerror(err));
427 gpgme_release(ctx);
428 return NULL;
429 }
430 gpgme_set_armor(ctx, TRUE);
431
432 encinfo = mimeinfo;
433
434 cipher = sgpgme_data_from_mimeinfo(encinfo);
435
436 plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
437
438 gpgme_data_release(cipher);
439 if (plain == NULL) {
440 debug_print("plain is null!\n");
441 gpgme_release(ctx);
442 return NULL;
443 }
444
445 fname = g_strdup_printf("%s%cplaintext.%08x",
446 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
447
448 if ((dstfp = claws_fopen(fname, "wb")) == NULL) {
449 FILE_OP_ERROR(fname, "claws_fopen");
450 g_free(fname);
451 gpgme_data_release(plain);
452 gpgme_release(ctx);
453 debug_print("can't open!\n");
454 privacy_set_error(_("Couldn't open temporary file"));
455 return NULL;
456 }
457
458 if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
459 FILE_OP_ERROR(fname, "fprintf");
460 g_free(fname);
461 claws_fclose(dstfp);
462 gpgme_data_release(plain);
463 gpgme_release(ctx);
464 debug_print("can't close!\n");
465 privacy_set_error(_("Couldn't write to temporary file"));
466 return NULL;
467 }
468
469 chars = sgpgme_data_release_and_get_mem(plain, &len);
470
471 if (len > 0) {
472 if (claws_fwrite(chars, 1, len, dstfp) < len) {
473 FILE_OP_ERROR(fname, "claws_fwrite");
474 claws_fclose(dstfp);
475 g_free(fname);
476 g_free(chars);
477 gpgme_data_release(plain);
478 gpgme_release(ctx);
479 debug_print("can't write!\n");
480 privacy_set_error(_("Couldn't write to temporary file"));
481 return NULL;
482 }
483 }
484 if (claws_safe_fclose(dstfp) == EOF) {
485 FILE_OP_ERROR(fname, "claws_fclose");
486 g_free(fname);
487 g_free(chars);
488 gpgme_data_release(plain);
489 gpgme_release(ctx);
490 debug_print("can't close!\n");
491 privacy_set_error(_("Couldn't close temporary file"));
492 return NULL;
493 }
494 g_free(chars);
495
496 parseinfo = procmime_scan_file(fname);
497 g_free(fname);
498 if (parseinfo == NULL) {
499 privacy_set_error(_("Couldn't parse decrypted file."));
500 gpgme_release(ctx);
501 return NULL;
502 }
503 decinfo = g_node_first_child(parseinfo->node) != NULL ?
504 g_node_first_child(parseinfo->node)->data : NULL;
505 if (decinfo == NULL) {
506 privacy_set_error(_("Couldn't parse decrypted file parts."));
507 gpgme_release(ctx);
508 return NULL;
509 }
510
511 g_node_unlink(decinfo->node);
512 procmime_mimeinfo_free_all(&parseinfo);
513
514 decinfo->tmp = TRUE;
515
516 if (sigstat != NULL && sigstat->signatures != NULL) {
517 if (decinfo->privacy != NULL) {
518 data = (PrivacyDataPGP *) decinfo->privacy;
519 } else {
520 data = smime_new_privacydata();
521 if (!data) {
522 gpgme_release(ctx);
523 return NULL;
524 }
525 decinfo->privacy = (PrivacyData *) data;
526 }
527 data->done_sigtest = TRUE;
528 data->is_signed = TRUE;
529 data->sigstatus = sigstat;
530 if (data->ctx)
531 gpgme_release(data->ctx);
532 data->ctx = ctx;
533 } else
534 gpgme_release(ctx);
535
536
537
538 return decinfo;
539 }
540
smime_sign(MimeInfo * mimeinfo,PrefsAccount * account,const gchar * from_addr)541 gboolean smime_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
542 {
543 MimeInfo *msgcontent, *sigmultipart, *newinfo;
544 gchar *textstr, *micalg = NULL;
545 FILE *fp;
546 gchar *boundary = NULL;
547 gchar *sigcontent;
548 gpgme_ctx_t ctx;
549 gpgme_data_t gpgtext, gpgsig;
550 gpgme_error_t err;
551 size_t len;
552 struct passphrase_cb_info_s info;
553 gpgme_sign_result_t result = NULL;
554 gchar *test_msg;
555 gchar *real_content = NULL;
556
557 fp = my_tmpfile();
558 if (fp == NULL) {
559 perror("my_tmpfile");
560 return FALSE;
561 }
562 procmime_write_mimeinfo(mimeinfo, fp);
563 rewind(fp);
564
565 /* read temporary file into memory */
566 test_msg = file_read_stream_to_str(fp);
567 claws_fclose(fp);
568
569 memset (&info, 0, sizeof info);
570
571 /* remove content node from message */
572 msgcontent = (MimeInfo *) mimeinfo->node->children->data;
573 g_node_unlink(msgcontent->node);
574
575 /* create temporary multipart for content */
576 sigmultipart = procmime_mimeinfo_new();
577 sigmultipart->type = MIMETYPE_MULTIPART;
578 sigmultipart->subtype = g_strdup("signed");
579
580 do {
581 if (boundary)
582 g_free(boundary);
583 boundary = generate_mime_boundary("Sig");
584 } while (strstr(test_msg, boundary) != NULL);
585
586 g_free(test_msg);
587
588 g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
589 g_strdup(boundary));
590 g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
591 g_strdup("application/pkcs7-signature"));
592 g_node_append(sigmultipart->node, msgcontent->node);
593 g_node_append(mimeinfo->node, sigmultipart->node);
594
595 /* write message content to temporary file */
596 fp = my_tmpfile();
597 if (fp == NULL) {
598 perror("my_tmpfile");
599 return FALSE;
600 }
601 procmime_write_mimeinfo(sigmultipart, fp);
602 rewind(fp);
603
604 /* read temporary file into memory */
605 textstr = get_canonical_content(fp, boundary);
606
607 g_free(boundary);
608
609 claws_fclose(fp);
610
611 gpgme_data_new_from_mem(&gpgtext, textstr, textstr?strlen(textstr):0, 0);
612 gpgme_data_new(&gpgsig);
613 gpgme_new(&ctx);
614 gpgme_set_armor(ctx, TRUE);
615 gpgme_signers_clear (ctx);
616
617 err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
618
619 if (err) {
620 debug_print ("gpgme_set_protocol failed: %s\n",
621 gpgme_strerror (err));
622 gpgme_data_release(gpgtext);
623 gpgme_release(ctx);
624 return FALSE;
625 }
626
627 if (!sgpgme_setup_signers(ctx, account, from_addr)) {
628 debug_print("setup_signers failed\n");
629 gpgme_data_release(gpgtext);
630 gpgme_release(ctx);
631 return FALSE;
632 }
633
634 info.c = ctx;
635 prefs_gpg_enable_agent(TRUE);
636 gpgme_set_passphrase_cb (ctx, NULL, &info);
637
638 err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
639 if (err != GPG_ERR_NO_ERROR) {
640 alertpanel_error("S/MIME : Cannot sign, %s (%d)", gpg_strerror(err), gpg_err_code(err));
641 gpgme_data_release(gpgtext);
642 gpgme_release(ctx);
643 return FALSE;
644 }
645 result = gpgme_op_sign_result(ctx);
646 if (result && result->signatures) {
647 if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
648 gchar *down_algo = g_ascii_strdown(gpgme_hash_algo_name(
649 result->signatures->hash_algo), -1);
650 micalg = g_strdup_printf("pgp-%s", down_algo);
651 g_free(down_algo);
652 } else {
653 micalg = g_strdup(gpgme_hash_algo_name(
654 result->signatures->hash_algo));
655 }
656 } else {
657 /* can't get result (maybe no signing key?) */
658 debug_print("gpgme_op_sign_result error\n");
659 return FALSE;
660 }
661
662 gpgme_release(ctx);
663 sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
664 gpgme_data_release(gpgtext);
665 g_free(textstr);
666
667 if (!sigcontent) {
668 gpgme_release(ctx);
669 g_free(micalg);
670 return FALSE;
671 }
672 real_content = sigcontent+strlen("-----BEGIN SIGNED MESSAGE-----\n");
673 if (!strstr(real_content, "-----END SIGNED MESSAGE-----")) {
674 debug_print("missing end\n");
675 gpgme_release(ctx);
676 g_free(micalg);
677 return FALSE;
678 }
679 *strstr(real_content, "-----END SIGNED MESSAGE-----") = '\0';
680 /* add signature */
681 g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
682 micalg);
683
684 newinfo = procmime_mimeinfo_new();
685 newinfo->type = MIMETYPE_APPLICATION;
686 newinfo->subtype = g_strdup("pkcs7-signature");
687 g_hash_table_insert(newinfo->typeparameters, g_strdup("name"),
688 g_strdup("smime.p7s"));
689 newinfo->content = MIMECONTENT_MEM;
690 newinfo->disposition = DISPOSITIONTYPE_ATTACHMENT;
691 g_hash_table_insert(newinfo->dispositionparameters, g_strdup("filename"),
692 g_strdup("smime.p7s"));
693 newinfo->data.mem = g_malloc(len + 1);
694 newinfo->tmp = TRUE;
695 memmove(newinfo->data.mem, real_content, len);
696 newinfo->data.mem[len] = '\0';
697 newinfo->encoding_type = ENC_BASE64;
698 g_node_append(sigmultipart->node, newinfo->node);
699
700 g_free(sigcontent);
701
702 return TRUE;
703 }
smime_get_encrypt_data(GSList * recp_names)704 gchar *smime_get_encrypt_data(GSList *recp_names)
705 {
706 return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_CMS);
707 }
708
smime_get_encrypt_warning(void)709 static const gchar *smime_get_encrypt_warning(void)
710 {
711 if (prefs_gpg_should_skip_encryption_warning(smime_system.id))
712 return NULL;
713 else
714 return _("Please note that email headers, like Subject, "
715 "are not encrypted by the S/MIME system.");
716 }
717
smime_inhibit_encrypt_warning(gboolean inhibit)718 static void smime_inhibit_encrypt_warning(gboolean inhibit)
719 {
720 if (inhibit)
721 prefs_gpg_add_skip_encryption_warning(smime_system.id);
722 else
723 prefs_gpg_remove_skip_encryption_warning(smime_system.id);
724 }
725
smime_encrypt(MimeInfo * mimeinfo,const gchar * encrypt_data)726 gboolean smime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
727 {
728 MimeInfo *msgcontent, *encmultipart;
729 FILE *fp;
730 gchar *enccontent;
731 size_t len;
732 gchar *textstr = NULL;
733 gpgme_data_t gpgtext = NULL, gpgenc = NULL;
734 gpgme_ctx_t ctx = NULL;
735 gpgme_key_t *kset = NULL;
736 gchar **fprs = g_strsplit(encrypt_data, " ", -1);
737 gint i = 0;
738 gpgme_error_t err;
739 gchar *tmpfile = NULL;
740
741 while (fprs[i] && strlen(fprs[i])) {
742 i++;
743 }
744
745 if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
746 debug_print ("gpgme_new failed: %s\n", gpgme_strerror(err));
747 return FALSE;
748 }
749
750 err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
751
752 if (err) {
753 debug_print ("gpgme_set_protocol failed: %s\n",
754 gpgme_strerror (err));
755 return FALSE;
756 }
757
758 kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
759 memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
760 i = 0;
761
762 while (fprs[i] && strlen(fprs[i])) {
763 gpgme_key_t key;
764 gpgme_error_t err;
765 err = gpgme_get_key(ctx, fprs[i], &key, 0);
766 if (err) {
767 debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
768 break;
769 }
770 debug_print("found %s at %d\n", fprs[i], i);
771 kset[i] = key;
772 i++;
773 }
774
775 debug_print("Encrypting message content\n");
776
777 /* remove content node from message */
778 msgcontent = (MimeInfo *) mimeinfo->node->children->data;
779 g_node_unlink(msgcontent->node);
780
781
782 /* create temporary multipart for content */
783 encmultipart = procmime_mimeinfo_new();
784 encmultipart->type = MIMETYPE_APPLICATION;
785 encmultipart->subtype = g_strdup("x-pkcs7-mime");
786 g_hash_table_insert(encmultipart->typeparameters, g_strdup("name"),
787 g_strdup("smime.p7m"));
788 g_hash_table_insert(encmultipart->typeparameters,
789 g_strdup("smime-type"),
790 g_strdup("enveloped-data"));
791
792 encmultipart->disposition = DISPOSITIONTYPE_ATTACHMENT;
793 g_hash_table_insert(encmultipart->dispositionparameters, g_strdup("filename"),
794 g_strdup("smime.p7m"));
795
796 g_node_append(encmultipart->node, msgcontent->node);
797
798 /* write message content to temporary file */
799 tmpfile = get_tmp_file();
800 fp = claws_fopen(tmpfile, "wb");
801 if (fp == NULL) {
802 FILE_OP_ERROR(tmpfile, "create");
803 g_free(kset);
804 return FALSE;
805 }
806 procmime_decode_content(msgcontent);
807 procmime_write_mime_header(msgcontent, fp);
808 procmime_write_mimeinfo(msgcontent, fp);
809 claws_safe_fclose(fp);
810 canonicalize_file_replace(tmpfile);
811 fp = claws_fopen(tmpfile, "rb");
812 if (fp == NULL) {
813 FILE_OP_ERROR(tmpfile, "open");
814 g_free(kset);
815 return FALSE;
816 }
817 g_free(tmpfile);
818
819 /* read temporary file into memory */
820 textstr = file_read_stream_to_str_no_recode(fp);
821
822 claws_fclose(fp);
823
824 /* encrypt data */
825 gpgme_data_new_from_mem(&gpgtext, textstr, textstr?strlen(textstr):0, 0);
826 gpgme_data_new(&gpgenc);
827 cm_gpgme_data_rewind(gpgtext);
828
829 gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
830
831 gpgme_release(ctx);
832 g_free(kset);
833 enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
834
835 if (!enccontent) {
836 g_warning("no enccontent");
837 return FALSE;
838 }
839
840 tmpfile = get_tmp_file();
841 fp = claws_fopen(tmpfile, "wb");
842 if (fp) {
843 if (claws_fwrite(enccontent, 1, len, fp) < len) {
844 FILE_OP_ERROR(tmpfile, "claws_fwrite");
845 claws_fclose(fp);
846 claws_unlink(tmpfile);
847 g_free(tmpfile);
848 g_free(enccontent);
849 return FALSE;
850 }
851 if (claws_safe_fclose(fp) == EOF) {
852 FILE_OP_ERROR(tmpfile, "claws_fclose");
853 claws_unlink(tmpfile);
854 g_free(tmpfile);
855 g_free(enccontent);
856 return FALSE;
857 }
858 } else {
859 FILE_OP_ERROR(tmpfile, "create");
860 g_free(tmpfile);
861 g_free(enccontent);
862 return FALSE;
863 }
864 gpgme_data_release(gpgtext);
865 g_free(textstr);
866
867 /* create encrypted multipart */
868 procmime_mimeinfo_free_all(&msgcontent);
869 g_node_append(mimeinfo->node, encmultipart->node);
870
871 encmultipart->content = MIMECONTENT_FILE;
872 encmultipart->data.filename = tmpfile;
873 encmultipart->tmp = TRUE;
874 procmime_encode_content(encmultipart, ENC_BASE64);
875
876 g_free(enccontent);
877
878 return TRUE;
879 }
880
881 static PrivacySystem smime_system = {
882 "smime", /* id */
883 "S-MIME", /* name */
884
885 smime_free_privacydata, /* free_privacydata */
886
887 smime_is_signed, /* is_signed(MimeInfo *) */
888 smime_check_signature, /* check_signature(MimeInfo *) */
889 smime_get_sig_status, /* get_sig_status(MimeInfo *) */
890 smime_get_sig_info_short, /* get_sig_info_short(MimeInfo *) */
891 smime_get_sig_info_full, /* get_sig_info_full(MimeInfo *) */
892
893 smime_is_encrypted, /* is_encrypted(MimeInfo *) */
894 smime_decrypt, /* decrypt(MimeInfo *) */
895
896 TRUE,
897 smime_sign,
898
899 TRUE,
900 smime_get_encrypt_data,
901 smime_encrypt,
902 smime_get_encrypt_warning,
903 smime_inhibit_encrypt_warning,
904 prefs_gpg_auto_check_signatures,
905 };
906
smime_init()907 void smime_init()
908 {
909 privacy_register_system(&smime_system);
910 }
911
smime_done()912 void smime_done()
913 {
914 privacy_unregister_system(&smime_system);
915 }
916
plugin_provides(void)917 struct PluginFeature *plugin_provides(void)
918 {
919 static struct PluginFeature features[] =
920 { {PLUGIN_PRIVACY, N_("S/MIME")},
921 {PLUGIN_NOTHING, NULL}};
922 return features;
923 }
924 #endif /* USE_GPGME */
925