src/plugins/pgpmime/pgpmime.c

   1 /*
   2  * Claws Mail -- a GTK based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2021 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 };
  56
  57 static PrivacySystem pgpmime_system;
  58
  59 static PrivacyDataPGP *pgpmime_new_privacydata()
  60 {
  61         PrivacyDataPGP *data;
  62
  63         data = g_new0(PrivacyDataPGP, 1);
  64         data->data.system = &pgpmime_system;
  65
  66         return data;
  67 }
  68
  69 static void pgpmime_free_privacydata(PrivacyData *data)
  70 {
  71         g_free(data);
  72 }
  73
  74 static gboolean pgpmime_is_signed(MimeInfo *mimeinfo)
  75 {
  76         MimeInfo *parent;
  77         MimeInfo *signature;
  78         const gchar *protocol;
  79         PrivacyDataPGP *data = NULL;
  80
  81         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
  82         if (mimeinfo->privacy != NULL) {
  83                 data = (PrivacyDataPGP *) mimeinfo->privacy;
  84                 if (data->done_sigtest)
  85                         return data->is_signed;
  86         }
  87
  88         /* check parent */
  89         parent = procmime_mimeinfo_parent(mimeinfo);
  90         if (parent == NULL)
  91                 return FALSE;
  92         if ((parent->type != MIMETYPE_MULTIPART) ||
  93             g_ascii_strcasecmp(parent->subtype, "signed"))
  94                 return FALSE;
  95         protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
  96         if ((protocol == NULL) ||
  97             (g_ascii_strcasecmp(protocol, "application/pgp-signature")))
  98                 return FALSE;
  99
 100         /* check if mimeinfo is the first child */
 101         if (parent->node->children->data != mimeinfo)
 102                 return FALSE;
 103
 104         /* check signature */
 105         signature = parent->node->children->next != NULL ?
 106             (MimeInfo *) parent->node->children->next->data : NULL;
 107         if (signature == NULL)
 108                 return FALSE;
 109         if ((signature->type != MIMETYPE_APPLICATION) ||
 110             (g_ascii_strcasecmp(signature->subtype, "pgp-signature")))
 111                 return FALSE;
 112
 113         if (data == NULL) {
 114                 data = pgpmime_new_privacydata();
 115                 mimeinfo->privacy = (PrivacyData *) data;
 116         }
 117         if (data != NULL) {
 118                 data->done_sigtest = TRUE;
 119                 data->is_signed = TRUE;
 120         }
 121
 122         return TRUE;
 123 }
 124
 125 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
 126 {
 127         GString *textbuffer;
 128         guint boundary_len;
 129         gchar buf[BUFFSIZE];
 130
 131         boundary_len = strlen(boundary);
 132         while (claws_fgets(buf, sizeof(buf), fp) != NULL)
 133                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 134                         break;
 135
 136         textbuffer = g_string_new("");
 137         while (claws_fgets(buf, sizeof(buf), fp) != NULL) {
 138                 gchar *buf2;
 139
 140                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 141                         break;
 142
 143                 buf2 = canonicalize_str(buf);
 144                 g_string_append(textbuffer, buf2);
 145                 g_free(buf2);
 146         }
 147         g_string_truncate(textbuffer, textbuffer->len - 2);
 148
 149         return g_string_free(textbuffer, FALSE);
 150 }
 151
 152 static gint pgpmime_check_sig_async(MimeInfo *mimeinfo,
 153         GCancellable *cancellable,
 154         GAsyncReadyCallback callback,
 155         gpointer user_data)
 156 {
 157         return cm_check_detached_sig_async(mimeinfo,
 158                 cancellable,
 159                 callback,
 160                 user_data,
 161                 GPGME_PROTOCOL_OpenPGP,
 162                 get_canonical_content);
 163 }
 164
 165 static gboolean pgpmime_is_encrypted(MimeInfo *mimeinfo)
 166 {
 167         MimeInfo *tmpinfo;
 168         const gchar *tmpstr;
 169         const gchar *begin_indicator = "-----BEGIN PGP MESSAGE-----";
 170         const gchar *end_indicator = "-----END PGP MESSAGE-----";
 171         gchar *textdata;
 172
 173         if (mimeinfo->type != MIMETYPE_MULTIPART)
 174                 return FALSE;
 175         if (g_ascii_strcasecmp(mimeinfo->subtype, "encrypted"))
 176                 return FALSE;
 177         tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "protocol");
 178         if ((tmpstr == NULL) || g_ascii_strcasecmp(tmpstr, "application/pgp-encrypted"))
 179                 return FALSE;
 180         if (g_node_n_children(mimeinfo->node) != 2)
 181                 return FALSE;
 182
 183         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 0)->data;
 184         if (tmpinfo->type != MIMETYPE_APPLICATION)
 185                 return FALSE;
 186         if (g_ascii_strcasecmp(tmpinfo->subtype, "pgp-encrypted"))
 187                 return FALSE;
 188
 189         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 190         if (tmpinfo->type != MIMETYPE_APPLICATION)
 191                 return FALSE;
 192         if (g_ascii_strcasecmp(tmpinfo->subtype, "octet-stream"))
 193                 return FALSE;
 194
 195         textdata = procmime_get_part_as_string(tmpinfo, TRUE);
 196         if (!textdata)
 197                 return FALSE;
 198
 199         if (!pgp_locate_armor_header(textdata, begin_indicator)) {
 200                 g_free(textdata);
 201                 return FALSE;
 202         }
 203         if (!pgp_locate_armor_header(textdata, end_indicator)) {
 204                 g_free(textdata);
 205                 return FALSE;
 206         }
 207
 208         g_free(textdata);
 209
 210         return TRUE;
 211 }
 212
 213 static MimeInfo *pgpmime_decrypt(MimeInfo *mimeinfo)
 214 {
 215         MimeInfo *encinfo, *decinfo, *parseinfo;
 216         gpgme_data_t cipher = NULL, plain = NULL;
 217         static gint id = 0;
 218         FILE *dstfp;
 219         gchar *fname;
 220         gpgme_verify_result_t sigstat = NULL;
 221         PrivacyDataPGP *data = NULL;
 222         gpgme_ctx_t ctx;
 223         gchar *chars;
 224         size_t len;
 225         gpgme_error_t err;
 226         SignatureData *sig_data = NULL;
 227
 228         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 229                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 230                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 231                 return NULL;
 232         }
 233
 234         cm_return_val_if_fail(pgpmime_is_encrypted(mimeinfo), NULL);
 235
 236         encinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 237
 238         cipher = sgpgme_data_from_mimeinfo(encinfo);
 239         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 240
 241         if (sigstat != NULL && sigstat->signatures != NULL) {
 242                 sig_data = g_new0(SignatureData, 1);
 243                 sig_data->status = sgpgme_sigstat_gpgme_to_privacy(ctx, sigstat);
 244                 sig_data->info_short = sgpgme_sigstat_info_short(ctx, sigstat);
 245                 sig_data->info_full = sgpgme_sigstat_info_full(ctx, sigstat);
 246         }
 247
 248         gpgme_release(ctx);
 249         gpgme_data_release(cipher);
 250         if (plain == NULL) {
 251                 debug_print("plain is null!\n");
 252                 if (sig_data)
 253                         privacy_free_signature_data(sig_data);
 254                 return NULL;
 255         }
 256
 257         fname = g_strdup_printf("%s%cplaintext.%08x",
 258                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 259
 260         if ((dstfp = claws_fopen(fname, "wb")) == NULL) {
 261                 FILE_OP_ERROR(fname, "claws_fopen");
 262                 privacy_set_error(_("Couldn't open decrypted file %s"), fname);
 263                 if (sig_data)
 264                         privacy_free_signature_data(sig_data);
 265                 g_free(fname);
 266                 gpgme_data_release(plain);
 267                 debug_print("can't open!\n");
 268                 return NULL;
 269         }
 270
 271         if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
 272                 FILE_OP_ERROR(fname, "fprintf");
 273                 claws_fclose(dstfp);
 274                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 275                 if (sig_data)
 276                         privacy_free_signature_data(sig_data);
 277                 g_free(fname);
 278                 gpgme_data_release(plain);
 279                 debug_print("can't open!\n");
 280                 return NULL;
 281         }
 282
 283         chars = sgpgme_data_release_and_get_mem(plain, &len);
 284         if (len > 0) {
 285                 if (claws_fwrite(chars, 1, len, dstfp) < len) {
 286                         FILE_OP_ERROR(fname, "claws_fwrite");
 287                         g_free(chars);
 288                         claws_fclose(dstfp);
 289                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 290                         if (sig_data)
 291                                 privacy_free_signature_data(sig_data);
 292                         g_free(fname);
 293                         gpgme_data_release(plain);
 294                         debug_print("can't open!\n");
 295                         return NULL;
 296                 }
 297         }
 298         g_free(chars);
 299
 300         if (claws_safe_fclose(dstfp) == EOF) {
 301                 FILE_OP_ERROR(fname, "claws_fclose");
 302                 privacy_set_error(_("Couldn't close decrypted file %s"), fname);
 303                 if (sig_data)
 304                         privacy_free_signature_data(sig_data);
 305                 g_free(fname);
 306                 gpgme_data_release(plain);
 307                 debug_print("can't open!\n");
 308                 return NULL;
 309         }
 310
 311         parseinfo = procmime_scan_file(fname);
 312         g_free(fname);
 313         if (parseinfo == NULL) {
 314                 privacy_set_error(_("Couldn't parse decrypted file."));
 315                 if (sig_data)
 316                         privacy_free_signature_data(sig_data);
 317                 return NULL;
 318         }
 319         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 320                 g_node_first_child(parseinfo->node)->data : NULL;
 321         if (decinfo == NULL) {
 322                 privacy_set_error(_("Couldn't parse decrypted file parts."));
 323                 if (sig_data)
 324                         privacy_free_signature_data(sig_data);
 325                 return NULL;
 326         }
 327
 328         g_node_unlink(decinfo->node);
 329         procmime_mimeinfo_free_all(&parseinfo);
 330
 331         decinfo->tmp = TRUE;
 332
 333         if (sig_data != NULL) {
 334                 if (decinfo->privacy != NULL) {
 335                         data = (PrivacyDataPGP *) decinfo->privacy;
 336                 } else {
 337                         data = pgpmime_new_privacydata();
 338                         decinfo->privacy = (PrivacyData *) data;
 339                 }
 340
 341                 if (data != NULL) {
 342                         data->done_sigtest = TRUE;
 343                         data->is_signed = TRUE;
 344                         decinfo->sig_data = sig_data;
 345                 }
 346         }
 347
 348         return decinfo;
 349 }
 350
 351 gboolean pgpmime_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 352 {
 353         MimeInfo *msgcontent, *sigmultipart, *newinfo;
 354         gchar *textstr, *micalg = NULL;
 355         FILE *fp;
 356         gchar *boundary = NULL;
 357         gchar *sigcontent;
 358         gpgme_ctx_t ctx;
 359         gpgme_data_t gpgtext, gpgsig;
 360         gpgme_error_t err;
 361         size_t len;
 362         struct passphrase_cb_info_s info;
 363         gpgme_sign_result_t result = NULL;
 364         gchar *test_msg;
 365
 366         fp = my_tmpfile();
 367         if (fp == NULL) {
 368                 perror("my_tmpfile");
 369                 privacy_set_error(_("Couldn't create temporary file: %s"), g_strerror(errno));
 370                 return FALSE;
 371         }
 372         procmime_write_mimeinfo(mimeinfo, fp);
 373         rewind(fp);
 374
 375         /* read temporary file into memory */
 376         test_msg = file_read_stream_to_str(fp);
 377         claws_fclose(fp);
 378
 379         memset (&info, 0, sizeof info);
 380
 381         /* remove content node from message */
 382         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 383         g_node_unlink(msgcontent->node);
 384
 385         /* create temporary multipart for content */
 386         sigmultipart = procmime_mimeinfo_new();
 387         sigmultipart->type = MIMETYPE_MULTIPART;
 388         sigmultipart->subtype = g_strdup("signed");
 389
 390         do {
 391                 g_free(boundary);
 392                 boundary = generate_mime_boundary("Sig");
 393         } while (strstr(test_msg, boundary) != NULL);
 394
 395         g_free(test_msg);
 396
 397         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
 398                             g_strdup(boundary));
 399         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
 400                             g_strdup("application/pgp-signature"));
 401         g_node_append(sigmultipart->node, msgcontent->node);
 402         g_node_append(mimeinfo->node, sigmultipart->node);
 403
 404         /* write message content to temporary file */
 405         fp = my_tmpfile();
 406         if (fp == NULL) {
 407                 perror("my_tmpfile");
 408                 privacy_set_error(_("Couldn't create temporary file: %s"), g_strerror(errno));
 409                 g_free(boundary);
 410                 return FALSE;
 411         }
 412         procmime_write_mimeinfo(sigmultipart, fp);
 413         rewind(fp);
 414
 415         /* read temporary file into memory */
 416         textstr = get_canonical_content(fp, boundary);
 417
 418         g_free(boundary);
 419         claws_fclose(fp);
 420
 421         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 422         gpgme_data_new(&gpgsig);
 423         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 424                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 425                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 426                 return FALSE;
 427         }
 428         gpgme_set_textmode(ctx, 1);
 429         gpgme_set_armor(ctx, 1);
 430         gpgme_signers_clear (ctx);
 431
 432         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 433                 gpgme_release(ctx);
 434                 return FALSE;
 435         }
 436
 437         prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
 438         if (g_getenv("GPG_AGENT_INFO") && prefs_gpg_get_config()->use_gpg_agent) {
 439                 debug_print("GPG_AGENT_INFO environment defined, running without passphrase callback\n");
 440         } else {
 441                 info.c = ctx;
 442                 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 443         }
 444
 445         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
 446         if (err != GPG_ERR_NO_ERROR) {
 447                 if (err == GPG_ERR_CANCELED) {
 448                         /* ignore cancelled signing */
 449                         privacy_reset_error();
 450                         debug_print("gpgme_op_sign cancelled\n");
 451                 } else {
 452                         privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
 453                         debug_print("gpgme_op_sign error : %x\n", err);
 454                 }
 455                 gpgme_release(ctx);
 456                 return FALSE;
 457         }
 458         result = gpgme_op_sign_result(ctx);
 459         if (result && result->signatures) {
 460                 gpgme_new_signature_t sig = result->signatures;
 461                 if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 462                         gchar *down_algo = g_ascii_strdown(gpgme_hash_algo_name(
 463                                 result->signatures->hash_algo), -1);
 464                         micalg = g_strdup_printf("pgp-%s", down_algo);
 465                         g_free(down_algo);
 466                 } else {
 467                         micalg = g_strdup(gpgme_hash_algo_name(
 468                                 result->signatures->hash_algo));
 469                 }
 470                 while (sig) {
 471                         debug_print("valid signature: %s\n", sig->fpr);
 472                         sig = sig->next;
 473                 }
 474         } else if (result && result->invalid_signers) {
 475                 gpgme_invalid_key_t invalid = result->invalid_signers;
 476                 while (invalid) {
 477                         g_warning("invalid signer: %s (%s)", invalid->fpr,
 478                                 gpgme_strerror(invalid->reason));
 479                         privacy_set_error(_("Data signing failed due to invalid signer: %s"),
 480                                 gpgme_strerror(invalid->reason));
 481                         invalid = invalid->next;
 482                 }
 483                 gpgme_release(ctx);
 484                 return FALSE;
 485         } else {
 486                 /* can't get result (maybe no signing key?) */
 487                 debug_print("gpgme_op_sign_result error\n");
 488                 privacy_set_error(_("Data signing failed, no results."));
 489                 gpgme_release(ctx);
 490                 return FALSE;
 491         }
 492
 493         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 494         gpgme_data_release(gpgtext);
 495         g_free(textstr);
 496
 497         if (sigcontent == NULL || len <= 0) {
 498                 g_warning("sgpgme_data_release_and_get_mem failed");
 499                 privacy_set_error(_("Data signing failed, no contents."));
 500                 g_free(micalg);
 501                 g_free(sigcontent);
 502                 gpgme_release(ctx);
 503                 return FALSE;
 504         }
 505
 506         /* add signature */
 507         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
 508                             micalg);
 509
 510         newinfo = procmime_mimeinfo_new();
 511         newinfo->type = MIMETYPE_APPLICATION;
 512         newinfo->subtype = g_strdup("pgp-signature");
 513         newinfo->description = g_strdup(_("OpenPGP digital signature"));
 514         newinfo->content = MIMECONTENT_MEM;
 515         newinfo->data.mem = g_malloc(len + 1);
 516         memmove(newinfo->data.mem, sigcontent, len);
 517         newinfo->data.mem[len] = '\0';
 518         newinfo->tmp = TRUE;
 519         g_node_append(sigmultipart->node, newinfo->node);
 520
 521         g_free(sigcontent);
 522         gpgme_release(ctx);
 523
 524         return TRUE;
 525 }
 526 gchar *pgpmime_get_encrypt_data(GSList *recp_names)
 527 {
 528         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
 529 }
 530
 531 static const gchar *pgpmime_get_encrypt_warning(void)
 532 {
 533         if (prefs_gpg_should_skip_encryption_warning(pgpmime_system.id))
 534                 return NULL;
 535         else
 536                 return _("Please note that email headers, like Subject, "
 537                          "are not encrypted by the PGP/Mime system.");
 538 }
 539
 540 static void pgpmime_inhibit_encrypt_warning(gboolean inhibit)
 541 {
 542         if (inhibit)
 543                 prefs_gpg_add_skip_encryption_warning(pgpmime_system.id);
 544         else
 545                 prefs_gpg_remove_skip_encryption_warning(pgpmime_system.id);
 546 }
 547
 548 gboolean pgpmime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 549 {
 550         MimeInfo *msgcontent, *encmultipart, *newinfo;
 551         FILE *fp;
 552         gchar *boundary, *enccontent;
 553         size_t len;
 554         gchar *textstr;
 555         gpgme_data_t gpgtext = NULL, gpgenc = NULL;
 556         gpgme_ctx_t ctx = NULL;
 557         gpgme_key_t *kset = NULL;
 558         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 559         gint i = 0;
 560         gpgme_error_t err;
 561
 562         while (fprs[i] && strlen(fprs[i])) {
 563                 i++;
 564         }
 565
 566         kset = g_malloc0(sizeof(gpgme_key_t)*(i+1));
 567         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 568                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 569                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 570                 g_free(kset);
 571                 g_free(fprs);
 572                 return FALSE;
 573         }
 574         i = 0;
 575         while (fprs[i] && strlen(fprs[i])) {
 576                 gpgme_key_t key;
 577                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 578                 if (err) {
 579                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 580                         privacy_set_error(_("Couldn't add GPG key %s, %s"), fprs[i], gpgme_strerror(err));
 581                         for (gint x = 0; x < i; x++)
 582                                 gpgme_key_unref(kset[x]);
 583                         g_free(kset);
 584                         g_free(fprs);
 585                         gpgme_release(ctx);
 586                         return FALSE;
 587                 }
 588                 debug_print("found %s at %d\n", fprs[i], i);
 589                 kset[i] = key;
 590                 i++;
 591         }
 592
 593         debug_print("Encrypting message content\n");
 594
 595         /* remove content node from message */
 596         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 597         g_node_unlink(msgcontent->node);
 598
 599         /* create temporary multipart for content */
 600         encmultipart = procmime_mimeinfo_new();
 601         encmultipart->type = MIMETYPE_MULTIPART;
 602         encmultipart->subtype = g_strdup("encrypted");
 603         boundary = generate_mime_boundary("Encrypt");
 604         g_hash_table_insert(encmultipart->typeparameters, g_strdup("boundary"),
 605                             g_strdup(boundary));
 606         g_hash_table_insert(encmultipart->typeparameters, g_strdup("protocol"),
 607                             g_strdup("application/pgp-encrypted"));
 608         g_node_append(encmultipart->node, msgcontent->node);
 609
 610         /* write message content to temporary file */
 611         fp = my_tmpfile();
 612         if (fp == NULL) {
 613                 perror("my_tmpfile");
 614                 privacy_set_error(_("Couldn't create temporary file, %s"), g_strerror(errno));
 615                 for (gint x = 0; x < i; x++)
 616                         gpgme_key_unref(kset[x]);
 617                 g_free(kset);
 618                 g_free(boundary);
 619                 g_free(fprs);
 620                 gpgme_release(ctx);
 621                 return FALSE;
 622         }
 623         procmime_write_mimeinfo(encmultipart, fp);
 624         rewind(fp);
 625
 626         /* read temporary file into memory */
 627         textstr = get_canonical_content(fp, boundary);
 628
 629         g_free(boundary);
 630         claws_fclose(fp);
 631
 632         /* encrypt data */
 633         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 634         gpgme_data_new(&gpgenc);
 635         gpgme_set_armor(ctx, 1);
 636         cm_gpgme_data_rewind(gpgtext);
 637
 638         err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 639
 640         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 641         gpgme_data_release(gpgtext);
 642         g_free(textstr);
 643         for (gint x = 0; x < i; x++)
 644                 gpgme_key_unref(kset[x]);
 645         g_free(kset);
 646
 647         if (enccontent == NULL || len <= 0) {
 648                 g_warning("sgpgme_data_release_and_get_mem failed");
 649                 privacy_set_error(_("Encryption failed, %s"), gpgme_strerror(err));
 650                 gpgme_release(ctx);
 651                 g_free(enccontent);
 652                 g_free(fprs);
 653                 return FALSE;
 654         }
 655
 656         /* create encrypted multipart */
 657         g_node_unlink(msgcontent->node);
 658         procmime_mimeinfo_free_all(&msgcontent);
 659         g_node_append(mimeinfo->node, encmultipart->node);
 660
 661         newinfo = procmime_mimeinfo_new();
 662         newinfo->type = MIMETYPE_APPLICATION;
 663         newinfo->subtype = g_strdup("pgp-encrypted");
 664         newinfo->content = MIMECONTENT_MEM;
 665         newinfo->data.mem = g_strdup("Version: 1\n");
 666         newinfo->tmp = TRUE;
 667         g_node_append(encmultipart->node, newinfo->node);
 668
 669         newinfo = procmime_mimeinfo_new();
 670         newinfo->type = MIMETYPE_APPLICATION;
 671         newinfo->subtype = g_strdup("octet-stream");
 672         newinfo->content = MIMECONTENT_MEM;
 673         newinfo->data.mem = g_malloc(len + 1);
 674         newinfo->tmp = TRUE;
 675         memmove(newinfo->data.mem, enccontent, len);
 676         newinfo->data.mem[len] = '\0';
 677         g_node_append(encmultipart->node, newinfo->node);
 678
 679         g_free(enccontent);
 680         gpgme_release(ctx);
 681
 682         g_free(fprs);
 683
 684         return TRUE;
 685 }
 686
 687 static PrivacySystem pgpmime_system = {
 688         "pgpmime",                      /* id */
 689         "PGP MIME",                     /* name */
 690
 691         pgpmime_free_privacydata,       /* free_privacydata */
 692
 693         pgpmime_is_signed,              /* is_signed(MimeInfo *) */
 694         pgpmime_check_sig_async,
 695
 696         pgpmime_is_encrypted,           /* is_encrypted(MimeInfo *) */
 697         pgpmime_decrypt,                /* decrypt(MimeInfo *) */
 698
 699         TRUE,
 700         pgpmime_sign,
 701
 702         TRUE,
 703         pgpmime_get_encrypt_data,
 704         pgpmime_encrypt,
 705         pgpmime_get_encrypt_warning,
 706         pgpmime_inhibit_encrypt_warning,
 707         prefs_gpg_auto_check_signatures,
 708 };
 709
 710 void pgpmime_init()
 711 {
 712         privacy_register_system(&pgpmime_system);
 713 }
 714
 715 void pgpmime_done()
 716 {
 717         privacy_unregister_system(&pgpmime_system);
 718 }
 719
 720 struct PluginFeature *plugin_provides(void)
 721 {
 722         static struct PluginFeature features[] =
 723                 { {PLUGIN_PRIVACY, N_("PGP/Mime")},
 724                   {PLUGIN_NOTHING, NULL}};
 725         return features;
 726 }
 727 #endif /* USE_GPGME */