e14ebe0405473e34b9e6d6e89480c7d2a3732157
[claws.git] / src / plugins / pgpmime / pgpmime.c
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
46 typedef struct _PrivacyDataPGP PrivacyDataPGP;
47
48 struct _PrivacyDataPGP
49 {
50         PrivacyData     data;
51         
52         gboolean        done_sigtest;
53         gboolean        is_signed;
54         gpgme_verify_result_t   sigstatus;
55         gpgme_ctx_t     ctx;
56 };
57
58 static PrivacySystem pgpmime_system;
59
60 static gint pgpmime_check_signature(MimeInfo *mimeinfo);
61
62 static PrivacyDataPGP *pgpmime_new_privacydata()
63 {
64         PrivacyDataPGP *data;
65         gpgme_error_t err;
66
67         data = g_new0(PrivacyDataPGP, 1);
68         data->data.system = &pgpmime_system;
69         data->done_sigtest = FALSE;
70         data->is_signed = FALSE;
71         data->sigstatus = NULL;
72         if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
73                 g_warning("Couldn't initialize GPG context: %s", gpgme_strerror(err));
74                 return NULL;
75         }
76         
77         return data;
78 }
79
80 static void pgpmime_free_privacydata(PrivacyData *_data)
81 {
82         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
83         gpgme_release(data->ctx);
84         g_free(data);
85 }
86
87 static gboolean pgpmime_is_signed(MimeInfo *mimeinfo)
88 {
89         MimeInfo *parent;
90         MimeInfo *signature;
91         const gchar *protocol;
92         PrivacyDataPGP *data = NULL;
93         
94         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
95         if (mimeinfo->privacy != NULL) {
96                 data = (PrivacyDataPGP *) mimeinfo->privacy;
97                 if (data->done_sigtest)
98                         return data->is_signed;
99         }
100         
101         /* check parent */
102         parent = procmime_mimeinfo_parent(mimeinfo);
103         if (parent == NULL)
104                 return FALSE;
105         if ((parent->type != MIMETYPE_MULTIPART) ||
106             g_ascii_strcasecmp(parent->subtype, "signed"))
107                 return FALSE;
108         protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
109         if ((protocol == NULL) || 
110             (g_ascii_strcasecmp(protocol, "application/pgp-signature")))
111                 return FALSE;
112
113         /* check if mimeinfo is the first child */
114         if (parent->node->children->data != mimeinfo)
115                 return FALSE;
116
117         /* check signature */
118         signature = parent->node->children->next != NULL ? 
119             (MimeInfo *) parent->node->children->next->data : NULL;
120         if (signature == NULL)
121                 return FALSE;
122         if ((signature->type != MIMETYPE_APPLICATION) ||
123             (g_ascii_strcasecmp(signature->subtype, "pgp-signature")))
124                 return FALSE;
125
126         if (data == NULL) {
127                 data = pgpmime_new_privacydata();
128                 mimeinfo->privacy = (PrivacyData *) data;
129         }
130         if (data != NULL) {
131                 data->done_sigtest = TRUE;
132                 data->is_signed = TRUE;
133         }
134
135         return TRUE;
136 }
137
138 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
139 {
140         gchar *ret;
141         GString *textbuffer;
142         guint boundary_len;
143         gchar buf[BUFFSIZE];
144
145         boundary_len = strlen(boundary);
146         while (fgets(buf, sizeof(buf), fp) != NULL)
147                 if (IS_BOUNDARY(buf, boundary, boundary_len))
148                         break;
149
150         textbuffer = g_string_new("");
151         while (fgets(buf, sizeof(buf), fp) != NULL) {
152                 gchar *buf2;
153
154                 if (IS_BOUNDARY(buf, boundary, boundary_len))
155                         break;
156                 
157                 buf2 = canonicalize_str(buf);
158                 g_string_append(textbuffer, buf2);
159                 g_free(buf2);
160         }
161         g_string_truncate(textbuffer, textbuffer->len - 2);
162                 
163         ret = textbuffer->str;
164         g_string_free(textbuffer, FALSE);
165
166         return ret;
167 }
168
169 static gint pgpmime_check_signature(MimeInfo *mimeinfo)
170 {
171         PrivacyDataPGP *data;
172         MimeInfo *parent, *signature;
173         FILE *fp;
174         gchar *boundary;
175         gchar *textstr;
176         gpgme_data_t sigdata = NULL, textdata = NULL;
177         gpgme_error_t err;
178         cm_return_val_if_fail(mimeinfo != NULL, -1);
179         cm_return_val_if_fail(mimeinfo->privacy != NULL, -1);
180         data = (PrivacyDataPGP *) mimeinfo->privacy;
181         if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
182                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
183                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
184                 return 0;
185         }
186
187         
188         debug_print("Checking PGP/MIME signature\n");
189
190         err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_OpenPGP);
191
192         if (err) {
193                 debug_print ("gpgme_set_protocol failed: %s\n",
194                    gpgme_strerror (err));
195         }
196         parent = procmime_mimeinfo_parent(mimeinfo);
197
198         fp = g_fopen(parent->data.filename, "rb");
199         cm_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
200         
201         boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
202         if (!boundary) {
203                 privacy_set_error(_("Signature boundary not found."));
204                 fclose(fp);
205                 return 0;
206         }
207         textstr = get_canonical_content(fp, boundary);
208
209         err = gpgme_data_new_from_mem(&textdata, textstr, (size_t)strlen(textstr), 0);
210         if (err) {
211                 debug_print ("gpgme_data_new_from_mem failed: %s\n",
212                    gpgme_strerror (err));
213         }
214         signature = (MimeInfo *) mimeinfo->node->next->data;
215         sigdata = sgpgme_data_from_mimeinfo(signature);
216
217         err = 0;
218         if (signature->encoding_type == ENC_BASE64) {
219                 err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
220         }
221         
222         if (err) {
223                 debug_print ("gpgme_data_set_encoding failed: %s\n",
224                         gpgme_strerror (err));
225         }
226
227         data->sigstatus =
228                 sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
229
230         gpgme_data_release(sigdata);
231         gpgme_data_release(textdata);
232         g_free(textstr);
233         fclose(fp);
234         
235         return 0;
236 }
237
238 static SignatureStatus pgpmime_get_sig_status(MimeInfo *mimeinfo)
239 {
240         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
241         
242         cm_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
243
244         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
245 }
246
247 static gchar *pgpmime_get_sig_info_short(MimeInfo *mimeinfo)
248 {
249         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
250         
251         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
252
253         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
254 }
255
256 static gchar *pgpmime_get_sig_info_full(MimeInfo *mimeinfo)
257 {
258         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
259
260         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
261
262         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
263 }
264
265 static gboolean pgpmime_is_encrypted(MimeInfo *mimeinfo)
266 {
267         MimeInfo *tmpinfo;
268         const gchar *tmpstr;
269         const gchar *begin_indicator = "-----BEGIN PGP MESSAGE-----";
270         const gchar *end_indicator = "-----END PGP MESSAGE-----";
271         gchar *textdata;
272
273         if (mimeinfo->type != MIMETYPE_MULTIPART)
274                 return FALSE;
275         if (g_ascii_strcasecmp(mimeinfo->subtype, "encrypted"))
276                 return FALSE;
277         tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "protocol");
278         if ((tmpstr == NULL) || g_ascii_strcasecmp(tmpstr, "application/pgp-encrypted"))
279                 return FALSE;
280         if (g_node_n_children(mimeinfo->node) != 2)
281                 return FALSE;
282         
283         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 0)->data;
284         if (tmpinfo->type != MIMETYPE_APPLICATION)
285                 return FALSE;
286         if (g_ascii_strcasecmp(tmpinfo->subtype, "pgp-encrypted"))
287                 return FALSE;
288         
289         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
290         if (tmpinfo->type != MIMETYPE_APPLICATION)
291                 return FALSE;
292         if (g_ascii_strcasecmp(tmpinfo->subtype, "octet-stream"))
293                 return FALSE;
294         
295         textdata = get_part_as_string(tmpinfo);
296         if (!textdata)
297                 return FALSE;
298         
299         if (!pgp_locate_armor_header(textdata, begin_indicator)) {
300                 g_free(textdata);
301                 return FALSE;
302         }
303         if (!pgp_locate_armor_header(textdata, end_indicator)) {
304                 g_free(textdata);
305                 return FALSE;
306         }
307
308         g_free(textdata);
309
310         return TRUE;
311 }
312
313 static MimeInfo *pgpmime_decrypt(MimeInfo *mimeinfo)
314 {
315         MimeInfo *encinfo, *decinfo, *parseinfo;
316         gpgme_data_t cipher = NULL, plain = NULL;
317         static gint id = 0;
318         FILE *dstfp;
319         gchar *fname;
320         gpgme_verify_result_t sigstat = NULL;
321         PrivacyDataPGP *data = NULL;
322         gpgme_ctx_t ctx;
323         gchar *chars;
324         size_t len;
325         gpgme_error_t err;
326
327         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
328                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
329                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
330                 return NULL;
331         }
332         
333         cm_return_val_if_fail(pgpmime_is_encrypted(mimeinfo), NULL);
334         
335         encinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
336
337         cipher = sgpgme_data_from_mimeinfo(encinfo);
338         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
339
340         gpgme_data_release(cipher);
341         if (plain == NULL) {
342                 debug_print("plain is null!\n");
343                 gpgme_release(ctx);
344                 return NULL;
345         }
346
347         fname = g_strdup_printf("%s%cplaintext.%08x",
348                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
349
350         if ((dstfp = g_fopen(fname, "wb")) == NULL) {
351                 FILE_OP_ERROR(fname, "fopen");
352                 privacy_set_error(_("Couldn't open decrypted file %s"), fname);
353                 g_free(fname);
354                 gpgme_data_release(plain);
355                 gpgme_release(ctx);
356                 debug_print("can't open!\n");
357                 return NULL;
358         }
359
360         if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
361                 FILE_OP_ERROR(fname, "fprintf");
362                 fclose(dstfp);
363                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
364                 g_free(fname);
365                 gpgme_data_release(plain);
366                 gpgme_release(ctx);
367                 debug_print("can't open!\n");
368                 return NULL;
369         }
370
371         chars = sgpgme_data_release_and_get_mem(plain, &len);
372         if (len > 0) {
373                 if (fwrite(chars, 1, len, dstfp) < len) {
374                         FILE_OP_ERROR(fname, "fwrite");
375                         g_free(chars);
376                         fclose(dstfp);
377                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
378                         g_free(fname);
379                         gpgme_data_release(plain);
380                         gpgme_release(ctx);
381                         debug_print("can't open!\n");
382                         return NULL;
383                 }
384         }
385         g_free(chars);
386
387         if (fclose(dstfp) == EOF) {
388                 FILE_OP_ERROR(fname, "fclose");
389                 privacy_set_error(_("Couldn't close decrypted file %s"), fname);
390                 g_free(fname);
391                 gpgme_data_release(plain);
392                 gpgme_release(ctx);
393                 debug_print("can't open!\n");
394                 return NULL;
395         }
396
397         parseinfo = procmime_scan_file(fname);
398         g_free(fname);
399         if (parseinfo == NULL) {
400                 gpgme_release(ctx);
401                 privacy_set_error(_("Couldn't parse decrypted file."));
402                 return NULL;
403         }
404         decinfo = g_node_first_child(parseinfo->node) != NULL ?
405                 g_node_first_child(parseinfo->node)->data : NULL;
406         if (decinfo == NULL) {
407                 privacy_set_error(_("Couldn't parse decrypted file parts."));
408                 gpgme_release(ctx);
409                 return NULL;
410         }
411
412         g_node_unlink(decinfo->node);
413         procmime_mimeinfo_free_all(&parseinfo);
414
415         decinfo->tmp = TRUE;
416
417         if (sigstat != NULL && sigstat->signatures != NULL) {
418                 if (decinfo->privacy != NULL) {
419                         data = (PrivacyDataPGP *) decinfo->privacy;
420                 } else {
421                         data = pgpmime_new_privacydata();
422                         decinfo->privacy = (PrivacyData *) data;        
423                 }
424                 if (data != NULL) {
425                         data->done_sigtest = TRUE;
426                         data->is_signed = TRUE;
427                         data->sigstatus = sigstat;
428                         if (data->ctx)
429                                 gpgme_release(data->ctx);
430                         data->ctx = ctx;
431                 }
432         } else
433                 gpgme_release(ctx);
434
435         return decinfo;
436 }
437
438 gboolean pgpmime_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
439 {
440         MimeInfo *msgcontent, *sigmultipart, *newinfo;
441         gchar *textstr, *micalg = NULL;
442         FILE *fp;
443         gchar *boundary = NULL;
444         gchar *sigcontent;
445         gpgme_ctx_t ctx;
446         gpgme_data_t gpgtext, gpgsig;
447         gpgme_error_t err;
448         size_t len;
449         struct passphrase_cb_info_s info;
450         gpgme_sign_result_t result = NULL;
451         gchar *test_msg;
452         
453         fp = my_tmpfile();
454         if (fp == NULL) {
455                 perror("my_tmpfile");
456                 privacy_set_error(_("Couldn't create temporary file: %s"), g_strerror(errno));
457                 return FALSE;
458         }
459         procmime_write_mimeinfo(mimeinfo, fp);
460         rewind(fp);
461
462         /* read temporary file into memory */
463         test_msg = file_read_stream_to_str(fp);
464         fclose(fp);
465         
466         memset (&info, 0, sizeof info);
467
468         /* remove content node from message */
469         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
470         g_node_unlink(msgcontent->node);
471
472         /* create temporary multipart for content */
473         sigmultipart = procmime_mimeinfo_new();
474         sigmultipart->type = MIMETYPE_MULTIPART;
475         sigmultipart->subtype = g_strdup("signed");
476         
477         do {
478                 g_free(boundary);
479                 boundary = generate_mime_boundary("Sig");
480         } while (strstr(test_msg, boundary) != NULL);
481         
482         g_free(test_msg);
483
484         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
485                             g_strdup(boundary));
486         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
487                             g_strdup("application/pgp-signature"));
488         g_node_append(sigmultipart->node, msgcontent->node);
489         g_node_append(mimeinfo->node, sigmultipart->node);
490
491         /* write message content to temporary file */
492         fp = my_tmpfile();
493         if (fp == NULL) {
494                 perror("my_tmpfile");
495                 privacy_set_error(_("Couldn't create temporary file: %s"), g_strerror(errno));
496                 return FALSE;
497         }
498         procmime_write_mimeinfo(sigmultipart, fp);
499         rewind(fp);
500
501         /* read temporary file into memory */
502         textstr = get_canonical_content(fp, boundary);
503
504         fclose(fp);
505
506         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
507         gpgme_data_new(&gpgsig);
508         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
509                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
510                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
511                 return FALSE;
512         }
513         gpgme_set_textmode(ctx, 1);
514         gpgme_set_armor(ctx, 1);
515         gpgme_signers_clear (ctx);
516
517         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
518                 gpgme_release(ctx);
519                 return FALSE;
520         }
521
522         prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
523         if (g_getenv("GPG_AGENT_INFO") && prefs_gpg_get_config()->use_gpg_agent) {
524                 debug_print("GPG_AGENT_INFO environment defined, running without passphrase callback\n");
525         } else {
526                 info.c = ctx;
527                 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
528         }
529
530         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
531         if (err != GPG_ERR_NO_ERROR) {
532                 if (err == GPG_ERR_CANCELED) {
533                         /* ignore cancelled signing */
534                         privacy_reset_error();
535                         debug_print("gpgme_op_sign cancelled\n");
536                 } else {
537                         privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
538                         debug_print("gpgme_op_sign error : %x\n", err);
539                 }
540                 gpgme_release(ctx);
541                 return FALSE;
542         }
543         result = gpgme_op_sign_result(ctx);
544         if (result && result->signatures) {
545                 gpgme_new_signature_t sig = result->signatures;
546                 if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
547                         gchar *down_algo = g_ascii_strdown(gpgme_hash_algo_name(
548                                 result->signatures->hash_algo), -1);
549                         micalg = g_strdup_printf("pgp-%s", down_algo);
550                         g_free(down_algo);
551                 } else {
552                         micalg = g_strdup(gpgme_hash_algo_name(
553                                 result->signatures->hash_algo));
554                 }
555                 while (sig) {
556                         debug_print("valid signature: %s\n", sig->fpr);
557                         sig = sig->next;
558                 }
559         } else if (result && result->invalid_signers) {
560                 gpgme_invalid_key_t invalid = result->invalid_signers;
561                 while (invalid) {
562                         g_warning("invalid signer: %s (%s)", invalid->fpr, 
563                                 gpgme_strerror(invalid->reason));
564                         privacy_set_error(_("Data signing failed due to invalid signer: %s"), 
565                                 gpgme_strerror(invalid->reason));
566                         invalid = invalid->next;
567                 }
568                 gpgme_release(ctx);
569                 return FALSE;
570         } else {
571                 /* can't get result (maybe no signing key?) */
572                 debug_print("gpgme_op_sign_result error\n");
573                 privacy_set_error(_("Data signing failed, no results."));
574                 gpgme_release(ctx);
575                 return FALSE;
576         }
577
578         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
579         gpgme_data_release(gpgtext);
580         g_free(textstr);
581
582         if (sigcontent == NULL || len <= 0) {
583                 g_warning("sgpgme_data_release_and_get_mem failed");
584                 privacy_set_error(_("Data signing failed, no contents."));
585                 g_free(micalg);
586                 g_free(sigcontent);
587                 return FALSE;
588         }
589
590         /* add signature */
591         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
592                             micalg);
593
594         newinfo = procmime_mimeinfo_new();
595         newinfo->type = MIMETYPE_APPLICATION;
596         newinfo->subtype = g_strdup("pgp-signature");
597         newinfo->description = g_strdup(_("OpenPGP digital signature"));
598         newinfo->content = MIMECONTENT_MEM;
599         newinfo->data.mem = g_malloc(len + 1);
600         g_memmove(newinfo->data.mem, sigcontent, len);
601         newinfo->data.mem[len] = '\0';
602         g_node_append(sigmultipart->node, newinfo->node);
603
604         g_free(sigcontent);
605         gpgme_release(ctx);
606
607         return TRUE;
608 }
609 gchar *pgpmime_get_encrypt_data(GSList *recp_names)
610 {
611         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
612 }
613
614 static const gchar *pgpmime_get_encrypt_warning(void)
615 {
616         if (prefs_gpg_should_skip_encryption_warning(pgpmime_system.id))
617                 return NULL;
618         else
619                 return _("Please note that email headers, like Subject, "
620                          "are not encrypted by the PGP/Mime system.");
621 }
622
623 static void pgpmime_inhibit_encrypt_warning(gboolean inhibit)
624 {
625         if (inhibit)
626                 prefs_gpg_add_skip_encryption_warning(pgpmime_system.id);
627         else
628                 prefs_gpg_remove_skip_encryption_warning(pgpmime_system.id);
629 }
630
631 gboolean pgpmime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
632 {
633         MimeInfo *msgcontent, *encmultipart, *newinfo;
634         FILE *fp;
635         gchar *boundary, *enccontent;
636         size_t len;
637         gchar *textstr;
638         gpgme_data_t gpgtext = NULL, gpgenc = NULL;
639         gpgme_ctx_t ctx = NULL;
640         gpgme_key_t *kset = NULL;
641         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
642         gint i = 0;
643         gpgme_error_t err;
644         
645         while (fprs[i] && strlen(fprs[i])) {
646                 i++;
647         }
648         
649         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
650         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
651         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
652                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
653                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
654                 g_free(kset);
655                 return FALSE;
656         }
657         i = 0;
658         while (fprs[i] && strlen(fprs[i])) {
659                 gpgme_key_t key;
660                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
661                 if (err) {
662                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
663                         privacy_set_error(_("Couldn't add GPG key %s, %s"), fprs[i], gpgme_strerror(err));
664                         g_free(kset);
665                         return FALSE;
666                 }
667                 debug_print("found %s at %d\n", fprs[i], i);
668                 kset[i] = key;
669                 i++;
670         }
671         
672         debug_print("Encrypting message content\n");
673
674         /* remove content node from message */
675         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
676         g_node_unlink(msgcontent->node);
677
678         /* create temporary multipart for content */
679         encmultipart = procmime_mimeinfo_new();
680         encmultipart->type = MIMETYPE_MULTIPART;
681         encmultipart->subtype = g_strdup("encrypted");
682         boundary = generate_mime_boundary("Encrypt");
683         g_hash_table_insert(encmultipart->typeparameters, g_strdup("boundary"),
684                             g_strdup(boundary));
685         g_hash_table_insert(encmultipart->typeparameters, g_strdup("protocol"),
686                             g_strdup("application/pgp-encrypted"));
687         g_node_append(encmultipart->node, msgcontent->node);
688
689         /* write message content to temporary file */
690         fp = my_tmpfile();
691         if (fp == NULL) {
692                 perror("my_tmpfile");
693                 privacy_set_error(_("Couldn't create temporary file, %s"), g_strerror(errno));
694                 g_free(kset);
695                 return FALSE;
696         }
697         procmime_write_mimeinfo(encmultipart, fp);
698         rewind(fp);
699
700         /* read temporary file into memory */
701         textstr = get_canonical_content(fp, boundary);
702
703         fclose(fp);
704
705         /* encrypt data */
706         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
707         gpgme_data_new(&gpgenc);
708         gpgme_set_armor(ctx, 1);
709         cm_gpgme_data_rewind(gpgtext);
710         
711         err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
712
713         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
714         gpgme_data_release(gpgtext);
715         g_free(textstr);
716         g_free(kset);
717
718         if (enccontent == NULL || len <= 0) {
719                 g_warning("sgpgme_data_release_and_get_mem failed");
720                 privacy_set_error(_("Encryption failed, %s"), gpgme_strerror(err));
721                 gpgme_release(ctx);
722                 g_free(enccontent);
723                 return FALSE;
724         }
725
726         /* create encrypted multipart */
727         g_node_unlink(msgcontent->node);
728         procmime_mimeinfo_free_all(&msgcontent);
729         g_node_append(mimeinfo->node, encmultipart->node);
730
731         newinfo = procmime_mimeinfo_new();
732         newinfo->type = MIMETYPE_APPLICATION;
733         newinfo->subtype = g_strdup("pgp-encrypted");
734         newinfo->content = MIMECONTENT_MEM;
735         newinfo->data.mem = g_strdup("Version: 1\n");
736         g_node_append(encmultipart->node, newinfo->node);
737
738         newinfo = procmime_mimeinfo_new();
739         newinfo->type = MIMETYPE_APPLICATION;
740         newinfo->subtype = g_strdup("octet-stream");
741         newinfo->content = MIMECONTENT_MEM;
742         newinfo->data.mem = g_malloc(len + 1);
743         g_memmove(newinfo->data.mem, enccontent, len);
744         newinfo->data.mem[len] = '\0';
745         g_node_append(encmultipart->node, newinfo->node);
746
747         g_free(enccontent);
748         gpgme_release(ctx);
749
750         return TRUE;
751 }
752
753 static PrivacySystem pgpmime_system = {
754         "pgpmime",                      /* id */
755         "PGP MIME",                     /* name */
756
757         pgpmime_free_privacydata,       /* free_privacydata */
758
759         pgpmime_is_signed,              /* is_signed(MimeInfo *) */
760         pgpmime_check_signature,        /* check_signature(MimeInfo *) */
761         pgpmime_get_sig_status,         /* get_sig_status(MimeInfo *) */
762         pgpmime_get_sig_info_short,     /* get_sig_info_short(MimeInfo *) */
763         pgpmime_get_sig_info_full,      /* get_sig_info_full(MimeInfo *) */
764
765         pgpmime_is_encrypted,           /* is_encrypted(MimeInfo *) */
766         pgpmime_decrypt,                /* decrypt(MimeInfo *) */
767
768         TRUE,
769         pgpmime_sign,
770
771         TRUE,
772         pgpmime_get_encrypt_data,
773         pgpmime_encrypt,
774         pgpmime_get_encrypt_warning,
775         pgpmime_inhibit_encrypt_warning,
776         prefs_gpg_auto_check_signatures,
777 };
778
779 void pgpmime_init()
780 {
781         privacy_register_system(&pgpmime_system);
782 }
783
784 void pgpmime_done()
785 {
786         privacy_unregister_system(&pgpmime_system);
787 }
788
789 struct PluginFeature *plugin_provides(void)
790 {
791         static struct PluginFeature features[] = 
792                 { {PLUGIN_PRIVACY, N_("PGP/Mime")},
793                   {PLUGIN_NOTHING, NULL}};
794         return features;
795 }
796 #endif /* USE_GPGME */