2 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
3 * Copyright (C) 1999-2007 Hiroyuki Yamamoto & the Claws Mail team
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 2 of the License, or
8 * (at your option) any later version.
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.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
28 #include <glib/gi18n.h>
39 #include <plugins/pgpcore/sgpgme.h>
40 #include <plugins/pgpcore/prefs_gpg.h>
41 #include <plugins/pgpcore/passphrase.h>
43 #include "prefs_common.h"
45 typedef struct _PrivacyDataPGP PrivacyDataPGP;
47 struct _PrivacyDataPGP
51 gboolean done_sigtest;
53 gpgme_verify_result_t sigstatus;
57 static PrivacySystem pgpmime_system;
59 static gint pgpmime_check_signature(MimeInfo *mimeinfo);
61 static PrivacyDataPGP *pgpmime_new_privacydata()
66 data = g_new0(PrivacyDataPGP, 1);
67 data->data.system = &pgpmime_system;
68 data->done_sigtest = FALSE;
69 data->is_signed = FALSE;
70 data->sigstatus = NULL;
71 if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
72 g_warning(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
79 static void pgpmime_free_privacydata(PrivacyData *_data)
81 PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
82 gpgme_release(data->ctx);
86 static gboolean pgpmime_is_signed(MimeInfo *mimeinfo)
90 const gchar *protocol;
91 PrivacyDataPGP *data = NULL;
93 g_return_val_if_fail(mimeinfo != NULL, FALSE);
94 if (mimeinfo->privacy != NULL) {
95 data = (PrivacyDataPGP *) mimeinfo->privacy;
96 if (data->done_sigtest)
97 return data->is_signed;
101 parent = procmime_mimeinfo_parent(mimeinfo);
104 if ((parent->type != MIMETYPE_MULTIPART) ||
105 g_ascii_strcasecmp(parent->subtype, "signed"))
107 protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
108 if ((protocol == NULL) ||
109 (g_ascii_strcasecmp(protocol, "application/pgp-signature")))
112 /* check if mimeinfo is the first child */
113 if (parent->node->children->data != mimeinfo)
116 /* check signature */
117 signature = parent->node->children->next != NULL ?
118 (MimeInfo *) parent->node->children->next->data : NULL;
119 if (signature == NULL)
121 if ((signature->type != MIMETYPE_APPLICATION) ||
122 (g_ascii_strcasecmp(signature->subtype, "pgp-signature")))
126 data = pgpmime_new_privacydata();
127 mimeinfo->privacy = (PrivacyData *) data;
130 data->done_sigtest = TRUE;
131 data->is_signed = TRUE;
136 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
143 boundary_len = strlen(boundary);
144 while (fgets(buf, sizeof(buf), fp) != NULL)
145 if (IS_BOUNDARY(buf, boundary, boundary_len))
148 textbuffer = g_string_new("");
149 while (fgets(buf, sizeof(buf), fp) != NULL) {
152 if (IS_BOUNDARY(buf, boundary, boundary_len))
155 buf2 = canonicalize_str(buf);
156 g_string_append(textbuffer, buf2);
159 g_string_truncate(textbuffer, textbuffer->len - 2);
161 ret = textbuffer->str;
162 g_string_free(textbuffer, FALSE);
167 static gint pgpmime_check_signature(MimeInfo *mimeinfo)
169 PrivacyDataPGP *data;
170 MimeInfo *parent, *signature;
174 gpgme_data_t sigdata = NULL, textdata = NULL;
176 g_return_val_if_fail(mimeinfo != NULL, -1);
177 g_return_val_if_fail(mimeinfo->privacy != NULL, -1);
178 data = (PrivacyDataPGP *) mimeinfo->privacy;
179 if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
180 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
181 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
186 debug_print("Checking PGP/MIME signature\n");
188 err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_OpenPGP);
191 debug_print ("gpgme_set_protocol failed: %s\n",
192 gpgme_strerror (err));
194 parent = procmime_mimeinfo_parent(mimeinfo);
196 fp = g_fopen(parent->data.filename, "rb");
197 g_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
199 boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
201 privacy_set_error(_("Signature boundary not found."));
204 textstr = get_canonical_content(fp, boundary);
206 err = gpgme_data_new_from_mem(&textdata, textstr, (size_t)strlen(textstr), 0);
208 debug_print ("gpgme_data_new_from_mem failed: %s\n",
209 gpgme_strerror (err));
211 signature = (MimeInfo *) mimeinfo->node->next->data;
212 sigdata = sgpgme_data_from_mimeinfo(signature);
215 if (signature->encoding_type == ENC_BASE64) {
216 err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
220 debug_print ("gpgme_data_set_encoding failed: %s\n",
221 gpgme_strerror (err));
225 sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
227 gpgme_data_release(sigdata);
228 gpgme_data_release(textdata);
235 static SignatureStatus pgpmime_get_sig_status(MimeInfo *mimeinfo)
237 PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
239 g_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
241 if (data->sigstatus == NULL &&
242 prefs_gpg_get_config()->auto_check_signatures)
243 pgpmime_check_signature(mimeinfo);
245 return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
248 static gchar *pgpmime_get_sig_info_short(MimeInfo *mimeinfo)
250 PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
252 g_return_val_if_fail(data != NULL, g_strdup("Error"));
254 if (data->sigstatus == NULL &&
255 prefs_gpg_get_config()->auto_check_signatures)
256 pgpmime_check_signature(mimeinfo);
258 return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
261 static gchar *pgpmime_get_sig_info_full(MimeInfo *mimeinfo)
263 PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
265 g_return_val_if_fail(data != NULL, g_strdup("Error"));
267 if (data->sigstatus == NULL &&
268 prefs_gpg_get_config()->auto_check_signatures)
269 pgpmime_check_signature(mimeinfo);
271 return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
274 static gboolean pgpmime_is_encrypted(MimeInfo *mimeinfo)
279 if (mimeinfo->type != MIMETYPE_MULTIPART)
281 if (g_ascii_strcasecmp(mimeinfo->subtype, "encrypted"))
283 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "protocol");
284 if ((tmpstr == NULL) || g_ascii_strcasecmp(tmpstr, "application/pgp-encrypted"))
286 if (g_node_n_children(mimeinfo->node) != 2)
289 tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 0)->data;
290 if (tmpinfo->type != MIMETYPE_APPLICATION)
292 if (g_ascii_strcasecmp(tmpinfo->subtype, "pgp-encrypted"))
295 tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
296 if (tmpinfo->type != MIMETYPE_APPLICATION)
298 if (g_ascii_strcasecmp(tmpinfo->subtype, "octet-stream"))
304 static MimeInfo *pgpmime_decrypt(MimeInfo *mimeinfo)
306 MimeInfo *encinfo, *decinfo, *parseinfo;
307 gpgme_data_t cipher = NULL, plain = NULL;
311 gpgme_verify_result_t sigstat = NULL;
312 PrivacyDataPGP *data = NULL;
318 if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
319 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
320 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
324 g_return_val_if_fail(pgpmime_is_encrypted(mimeinfo), NULL);
326 encinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
328 cipher = sgpgme_data_from_mimeinfo(encinfo);
329 plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
331 gpgme_data_release(cipher);
333 debug_print("plain is null!\n");
338 fname = g_strdup_printf("%s%cplaintext.%08x",
339 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
341 if ((dstfp = g_fopen(fname, "wb")) == NULL) {
342 FILE_OP_ERROR(fname, "fopen");
343 privacy_set_error(_("Couldn't open decrypted file %s"), fname);
345 gpgme_data_release(plain);
347 debug_print("can't open!\n");
351 fprintf(dstfp, "MIME-Version: 1.0\n");
353 chars = gpgme_data_release_and_get_mem(plain, &len);
355 fwrite(chars, len, 1, dstfp);
358 parseinfo = procmime_scan_file(fname);
360 if (parseinfo == NULL) {
362 privacy_set_error(_("Couldn't parse decrypted file."));
365 decinfo = g_node_first_child(parseinfo->node) != NULL ?
366 g_node_first_child(parseinfo->node)->data : NULL;
367 if (decinfo == NULL) {
368 privacy_set_error(_("Couldn't parse decrypted file parts."));
373 g_node_unlink(decinfo->node);
374 procmime_mimeinfo_free_all(parseinfo);
378 if (sigstat != NULL && sigstat->signatures != NULL) {
379 if (decinfo->privacy != NULL) {
380 data = (PrivacyDataPGP *) decinfo->privacy;
382 data = pgpmime_new_privacydata();
383 decinfo->privacy = (PrivacyData *) data;
385 data->done_sigtest = TRUE;
386 data->is_signed = TRUE;
387 data->sigstatus = sigstat;
389 gpgme_release(data->ctx);
397 gboolean pgpmime_sign(MimeInfo *mimeinfo, PrefsAccount *account)
399 MimeInfo *msgcontent, *sigmultipart, *newinfo;
400 gchar *textstr, *micalg;
402 gchar *boundary = NULL;
405 gpgme_data_t gpgtext, gpgsig;
408 struct passphrase_cb_info_s info;
409 gpgme_sign_result_t result = NULL;
414 privacy_set_error(_("Couldn't create temporary file: %s"), strerror(errno));
417 procmime_write_mimeinfo(mimeinfo, fp);
420 /* read temporary file into memory */
421 test_msg = file_read_stream_to_str(fp);
424 memset (&info, 0, sizeof info);
426 /* remove content node from message */
427 msgcontent = (MimeInfo *) mimeinfo->node->children->data;
428 g_node_unlink(msgcontent->node);
430 /* create temporary multipart for content */
431 sigmultipart = procmime_mimeinfo_new();
432 sigmultipart->type = MIMETYPE_MULTIPART;
433 sigmultipart->subtype = g_strdup("signed");
437 boundary = generate_mime_boundary("Sig");
438 } while (strstr(test_msg, boundary) != NULL);
442 g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
444 g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
445 g_strdup("application/pgp-signature"));
446 g_node_append(sigmultipart->node, msgcontent->node);
447 g_node_append(mimeinfo->node, sigmultipart->node);
449 /* write message content to temporary file */
452 perror("my_tmpfile");
453 privacy_set_error(_("Couldn't create temporary file: %s"), strerror(errno));
456 procmime_write_mimeinfo(sigmultipart, fp);
459 /* read temporary file into memory */
460 textstr = get_canonical_content(fp, boundary);
464 gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
465 gpgme_data_new(&gpgsig);
466 if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
467 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
468 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
471 gpgme_set_textmode(ctx, 1);
472 gpgme_set_armor(ctx, 1);
473 gpgme_signers_clear (ctx);
475 if (!sgpgme_setup_signers(ctx, account)) {
480 if (getenv("GPG_AGENT_INFO")) {
481 debug_print("GPG_AGENT_INFO environment defined, running without passphrase callback\n");
484 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
487 err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
488 if (err != GPG_ERR_NO_ERROR) {
489 if (err == GPG_ERR_CANCELED) {
490 /* ignore cancelled signing */
491 privacy_reset_error();
492 debug_print("gpgme_op_sign cancelled\n");
494 privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
495 debug_print("gpgme_op_sign error : %x\n", err);
500 result = gpgme_op_sign_result(ctx);
501 if (result && result->signatures) {
502 gpgme_new_signature_t sig = result->signatures;
503 if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
504 micalg = g_strdup_printf("PGP-%s", gpgme_hash_algo_name(
505 result->signatures->hash_algo));
507 micalg = g_strdup(gpgme_hash_algo_name(
508 result->signatures->hash_algo));
511 debug_print("valid signature: %s\n", sig->fpr);
514 } else if (result && result->invalid_signers) {
515 gpgme_invalid_key_t invalid = result->invalid_signers;
517 g_warning("invalid signer: %s (%s)", invalid->fpr,
518 gpgme_strerror(invalid->reason));
519 privacy_set_error(_("Data signing failed due to invalid signer: %s"),
520 gpgme_strerror(invalid->reason));
521 invalid = invalid->next;
526 /* can't get result (maybe no signing key?) */
527 debug_print("gpgme_op_sign_result error\n");
528 privacy_set_error(_("Data signing failed, no results."));
533 sigcontent = gpgme_data_release_and_get_mem(gpgsig, &len);
534 gpgme_data_release(gpgtext);
537 if (sigcontent == NULL || len <= 0) {
538 g_warning("gpgme_data_release_and_get_mem failed");
539 privacy_set_error(_("Data signing failed, no contents."));
544 g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
547 newinfo = procmime_mimeinfo_new();
548 newinfo->type = MIMETYPE_APPLICATION;
549 newinfo->subtype = g_strdup("pgp-signature");
550 g_hash_table_insert(newinfo->typeparameters, g_strdup("name"),
551 g_strdup("signature.asc"));
552 newinfo->content = MIMECONTENT_MEM;
553 newinfo->disposition = DISPOSITIONTYPE_ATTACHMENT;
554 g_hash_table_insert(newinfo->dispositionparameters, g_strdup("filename"),
555 g_strdup("signature.asc"));
556 newinfo->data.mem = g_malloc(len + 1);
557 g_memmove(newinfo->data.mem, sigcontent, len);
558 newinfo->data.mem[len] = '\0';
559 g_node_append(sigmultipart->node, newinfo->node);
566 gchar *pgpmime_get_encrypt_data(GSList *recp_names)
568 return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
571 gboolean pgpmime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
573 MimeInfo *msgcontent, *encmultipart, *newinfo;
575 gchar *boundary, *enccontent;
578 gpgme_data_t gpgtext = NULL, gpgenc = NULL;
579 gpgme_ctx_t ctx = NULL;
580 gpgme_key_t *kset = NULL;
581 gchar **fprs = g_strsplit(encrypt_data, " ", -1);
585 while (fprs[i] && strlen(fprs[i])) {
589 kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
590 memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
591 if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
592 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
593 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
597 while (fprs[i] && strlen(fprs[i])) {
599 err = gpgme_get_key(ctx, fprs[i], &key, 0);
601 debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
602 privacy_set_error(_("Couldn't add GPG key %s, %s"), fprs[i], gpgme_strerror(err));
605 debug_print("found %s at %d\n", fprs[i], i);
610 debug_print("Encrypting message content\n");
612 /* remove content node from message */
613 msgcontent = (MimeInfo *) mimeinfo->node->children->data;
614 g_node_unlink(msgcontent->node);
616 /* create temporary multipart for content */
617 encmultipart = procmime_mimeinfo_new();
618 encmultipart->type = MIMETYPE_MULTIPART;
619 encmultipart->subtype = g_strdup("encrypted");
620 boundary = generate_mime_boundary("Encrypt");
621 g_hash_table_insert(encmultipart->typeparameters, g_strdup("boundary"),
623 g_hash_table_insert(encmultipart->typeparameters, g_strdup("protocol"),
624 g_strdup("application/pgp-encrypted"));
625 g_node_append(encmultipart->node, msgcontent->node);
627 /* write message content to temporary file */
630 privacy_set_error(_("Couldn't create temporary file, %s"), strerror(errno));
633 procmime_write_mimeinfo(encmultipart, fp);
636 /* read temporary file into memory */
637 textstr = get_canonical_content(fp, boundary);
642 gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
643 gpgme_data_new(&gpgenc);
644 gpgme_set_armor(ctx, 1);
645 gpgme_data_rewind(gpgtext);
647 err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
649 enccontent = gpgme_data_release_and_get_mem(gpgenc, &len);
650 gpgme_data_release(gpgtext);
653 if (enccontent == NULL || len <= 0) {
654 g_warning("gpgme_data_release_and_get_mem failed");
655 privacy_set_error(_("Encryption failed, %s"), gpgme_strerror(err));
660 /* create encrypted multipart */
661 g_node_unlink(msgcontent->node);
662 procmime_mimeinfo_free_all(msgcontent);
663 g_node_append(mimeinfo->node, encmultipart->node);
665 newinfo = procmime_mimeinfo_new();
666 newinfo->type = MIMETYPE_APPLICATION;
667 newinfo->subtype = g_strdup("pgp-encrypted");
668 newinfo->content = MIMECONTENT_MEM;
669 newinfo->data.mem = g_strdup("Version: 1\n");
670 g_node_append(encmultipart->node, newinfo->node);
672 newinfo = procmime_mimeinfo_new();
673 newinfo->type = MIMETYPE_APPLICATION;
674 newinfo->subtype = g_strdup("octet-stream");
675 newinfo->content = MIMECONTENT_MEM;
676 newinfo->data.mem = g_malloc(len + 1);
677 g_memmove(newinfo->data.mem, enccontent, len);
678 newinfo->data.mem[len] = '\0';
679 g_node_append(encmultipart->node, newinfo->node);
687 static PrivacySystem pgpmime_system = {
689 "PGP MIME", /* name */
691 pgpmime_free_privacydata, /* free_privacydata */
693 pgpmime_is_signed, /* is_signed(MimeInfo *) */
694 pgpmime_check_signature, /* check_signature(MimeInfo *) */
695 pgpmime_get_sig_status, /* get_sig_status(MimeInfo *) */
696 pgpmime_get_sig_info_short, /* get_sig_info_short(MimeInfo *) */
697 pgpmime_get_sig_info_full, /* get_sig_info_full(MimeInfo *) */
699 pgpmime_is_encrypted, /* is_encrypted(MimeInfo *) */
700 pgpmime_decrypt, /* decrypt(MimeInfo *) */
706 pgpmime_get_encrypt_data,
712 privacy_register_system(&pgpmime_system);
717 privacy_unregister_system(&pgpmime_system);
720 struct PluginFeature *plugin_provides(void)
722 static struct PluginFeature features[] =
723 { {PLUGIN_PRIVACY, N_("PGP/Mime")},
724 {PLUGIN_NOTHING, NULL}};
727 #endif /* USE_GPGME */