src/plugins/pgpmime/pgpmime.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2006 Hiroyuki Yamamoto & 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 2 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, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.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
  43 #include "prefs_common.h"
  44
  45 typedef struct _PrivacyDataPGP PrivacyDataPGP;
  46
  47 struct _PrivacyDataPGP
  48 {
  49         PrivacyData     data;
  50
  51         gboolean        done_sigtest;
  52         gboolean        is_signed;
  53         gpgme_verify_result_t   sigstatus;
  54         gpgme_ctx_t     ctx;
  55 };
  56
  57 static PrivacySystem pgpmime_system;
  58
  59 static gint pgpmime_check_signature(MimeInfo *mimeinfo);
  60
  61 static PrivacyDataPGP *pgpmime_new_privacydata()
  62 {
  63         PrivacyDataPGP *data;
  64
  65         data = g_new0(PrivacyDataPGP, 1);
  66         data->data.system = &pgpmime_system;
  67         data->done_sigtest = FALSE;
  68         data->is_signed = FALSE;
  69         data->sigstatus = NULL;
  70         gpgme_new(&data->ctx);
  71
  72         return data;
  73 }
  74
  75 static void pgpmime_free_privacydata(PrivacyData *_data)
  76 {
  77         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
  78         gpgme_release(data->ctx);
  79         g_free(data);
  80 }
  81
  82 static gboolean pgpmime_is_signed(MimeInfo *mimeinfo)
  83 {
  84         MimeInfo *parent;
  85         MimeInfo *signature;
  86         const gchar *protocol;
  87         PrivacyDataPGP *data = NULL;
  88
  89         g_return_val_if_fail(mimeinfo != NULL, FALSE);
  90         if (mimeinfo->privacy != NULL) {
  91                 data = (PrivacyDataPGP *) mimeinfo->privacy;
  92                 if (data->done_sigtest)
  93                         return data->is_signed;
  94         }
  95
  96         /* check parent */
  97         parent = procmime_mimeinfo_parent(mimeinfo);
  98         if (parent == NULL)
  99                 return FALSE;
 100         if ((parent->type != MIMETYPE_MULTIPART) ||
 101             g_ascii_strcasecmp(parent->subtype, "signed"))
 102                 return FALSE;
 103         protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
 104         if ((protocol == NULL) ||
 105             (g_ascii_strcasecmp(protocol, "application/pgp-signature")))
 106                 return FALSE;
 107
 108         /* check if mimeinfo is the first child */
 109         if (parent->node->children->data != mimeinfo)
 110                 return FALSE;
 111
 112         /* check signature */
 113         signature = parent->node->children->next != NULL ?
 114             (MimeInfo *) parent->node->children->next->data : NULL;
 115         if (signature == NULL)
 116                 return FALSE;
 117         if ((signature->type != MIMETYPE_APPLICATION) ||
 118             (g_ascii_strcasecmp(signature->subtype, "pgp-signature")))
 119                 return FALSE;
 120
 121         if (data == NULL) {
 122                 data = pgpmime_new_privacydata();
 123                 mimeinfo->privacy = (PrivacyData *) data;
 124         }
 125
 126         data->done_sigtest = TRUE;
 127         data->is_signed = TRUE;
 128
 129         return TRUE;
 130 }
 131
 132 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
 133 {
 134         gchar *ret;
 135         GString *textbuffer;
 136         guint boundary_len;
 137         gchar buf[BUFFSIZE];
 138
 139         boundary_len = strlen(boundary);
 140         while (fgets(buf, sizeof(buf), fp) != NULL)
 141                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 142                         break;
 143
 144         textbuffer = g_string_new("");
 145         while (fgets(buf, sizeof(buf), fp) != NULL) {
 146                 gchar *buf2;
 147
 148                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 149                         break;
 150
 151                 buf2 = canonicalize_str(buf);
 152                 g_string_append(textbuffer, buf2);
 153                 g_free(buf2);
 154         }
 155         g_string_truncate(textbuffer, textbuffer->len - 2);
 156
 157         ret = textbuffer->str;
 158         g_string_free(textbuffer, FALSE);
 159
 160         return ret;
 161 }
 162
 163 static gint pgpmime_check_signature(MimeInfo *mimeinfo)
 164 {
 165         PrivacyDataPGP *data;
 166         MimeInfo *parent, *signature;
 167         FILE *fp;
 168         gchar *boundary;
 169         gchar *textstr;
 170         gpgme_data_t sigdata = NULL, textdata = NULL;
 171         gpgme_error_t err;
 172         g_return_val_if_fail(mimeinfo != NULL, -1);
 173         g_return_val_if_fail(mimeinfo->privacy != NULL, -1);
 174         data = (PrivacyDataPGP *) mimeinfo->privacy;
 175         gpgme_new(&data->ctx);
 176
 177         debug_print("Checking PGP/MIME signature\n");
 178
 179         err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_OpenPGP);
 180
 181         if (err) {
 182                 debug_print ("gpgme_set_protocol failed: %s\n",
 183                    gpgme_strerror (err));
 184         }
 185         parent = procmime_mimeinfo_parent(mimeinfo);
 186
 187         fp = g_fopen(parent->data.filename, "rb");
 188         g_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
 189
 190         boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
 191         if (!boundary) {
 192                 privacy_set_error(_("Signature boundary not found."));
 193                 return 0;
 194         }
 195         textstr = get_canonical_content(fp, boundary);
 196
 197         err = gpgme_data_new_from_mem(&textdata, textstr, strlen(textstr), 0);
 198         if (err) {
 199                 debug_print ("gpgme_data_new_from_mem failed: %s\n",
 200                    gpgme_strerror (err));
 201         }
 202         signature = (MimeInfo *) mimeinfo->node->next->data;
 203         sigdata = sgpgme_data_from_mimeinfo(signature);
 204
 205         err = 0;
 206         if (signature->encoding_type == ENC_BASE64) {
 207                 err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
 208         }
 209
 210         if (err) {
 211                 debug_print ("gpgme_data_set_encoding failed: %s\n",
 212                         gpgme_strerror (err));
 213         }
 214
 215         data->sigstatus =
 216                 sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
 217
 218         gpgme_data_release(sigdata);
 219         gpgme_data_release(textdata);
 220         g_free(textstr);
 221         fclose(fp);
 222
 223         return 0;
 224 }
 225
 226 static SignatureStatus pgpmime_get_sig_status(MimeInfo *mimeinfo)
 227 {
 228         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 229
 230         g_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
 231
 232         if (data->sigstatus == NULL &&
 233             prefs_gpg_get_config()->auto_check_signatures)
 234                 pgpmime_check_signature(mimeinfo);
 235
 236         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
 237 }
 238
 239 static gchar *pgpmime_get_sig_info_short(MimeInfo *mimeinfo)
 240 {
 241         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 242
 243         g_return_val_if_fail(data != NULL, g_strdup("Error"));
 244
 245         if (data->sigstatus == NULL &&
 246             prefs_gpg_get_config()->auto_check_signatures)
 247                 pgpmime_check_signature(mimeinfo);
 248
 249         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 250 }
 251
 252 static gchar *pgpmime_get_sig_info_full(MimeInfo *mimeinfo)
 253 {
 254         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 255
 256         g_return_val_if_fail(data != NULL, g_strdup("Error"));
 257
 258         if (data->sigstatus == NULL &&
 259             prefs_gpg_get_config()->auto_check_signatures)
 260                 pgpmime_check_signature(mimeinfo);
 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
 270         if (mimeinfo->type != MIMETYPE_MULTIPART)
 271                 return FALSE;
 272         if (g_ascii_strcasecmp(mimeinfo->subtype, "encrypted"))
 273                 return FALSE;
 274         tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "protocol");
 275         if ((tmpstr == NULL) || g_ascii_strcasecmp(tmpstr, "application/pgp-encrypted"))
 276                 return FALSE;
 277         if (g_node_n_children(mimeinfo->node) != 2)
 278                 return FALSE;
 279
 280         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 0)->data;
 281         if (tmpinfo->type != MIMETYPE_APPLICATION)
 282                 return FALSE;
 283         if (g_ascii_strcasecmp(tmpinfo->subtype, "pgp-encrypted"))
 284                 return FALSE;
 285
 286         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 287         if (tmpinfo->type != MIMETYPE_APPLICATION)
 288                 return FALSE;
 289         if (g_ascii_strcasecmp(tmpinfo->subtype, "octet-stream"))
 290                 return FALSE;
 291
 292         return TRUE;
 293 }
 294
 295 static MimeInfo *pgpmime_decrypt(MimeInfo *mimeinfo)
 296 {
 297         MimeInfo *encinfo, *decinfo, *parseinfo;
 298         gpgme_data_t cipher = NULL, plain = NULL;
 299         static gint id = 0;
 300         FILE *dstfp;
 301         gchar *fname;
 302         gpgme_verify_result_t sigstat = NULL;
 303         PrivacyDataPGP *data = NULL;
 304         gpgme_ctx_t ctx;
 305         gchar *chars;
 306         size_t len;
 307         gpgme_error_t err;
 308
 309         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 310         privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 311                 return NULL;
 312         }
 313
 314         g_return_val_if_fail(pgpmime_is_encrypted(mimeinfo), NULL);
 315
 316         encinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 317
 318         cipher = sgpgme_data_from_mimeinfo(encinfo);
 319         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 320
 321         gpgme_data_release(cipher);
 322         if (plain == NULL) {
 323                 debug_print("plain is null!\n");
 324                 gpgme_release(ctx);
 325                 return NULL;
 326         }
 327
 328         fname = g_strdup_printf("%s%cplaintext.%08x",
 329                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 330
 331         if ((dstfp = g_fopen(fname, "wb")) == NULL) {
 332                 FILE_OP_ERROR(fname, "fopen");
 333                 privacy_set_error(_("Couldn't open decrypted file %s"), fname);
 334                 g_free(fname);
 335                 gpgme_data_release(plain);
 336                 gpgme_release(ctx);
 337                 debug_print("can't open!\n");
 338                 return NULL;
 339         }
 340
 341         fprintf(dstfp, "MIME-Version: 1.0\n");
 342
 343         chars = gpgme_data_release_and_get_mem(plain, &len);
 344         if (len > 0)
 345                 fwrite(chars, len, 1, dstfp);
 346         fclose(dstfp);
 347
 348         parseinfo = procmime_scan_file(fname);
 349         g_free(fname);
 350         if (parseinfo == NULL) {
 351                 gpgme_release(ctx);
 352                 privacy_set_error(_("Couldn't parse decrypted file."));
 353                 return NULL;
 354         }
 355         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 356                 g_node_first_child(parseinfo->node)->data : NULL;
 357         if (decinfo == NULL) {
 358                 privacy_set_error(_("Couldn't parse decrypted file parts."));
 359                 gpgme_release(ctx);
 360                 return NULL;
 361         }
 362
 363         g_node_unlink(decinfo->node);
 364         procmime_mimeinfo_free_all(parseinfo);
 365
 366         decinfo->tmp = TRUE;
 367
 368         if (sigstat != NULL && sigstat->signatures != NULL) {
 369                 if (decinfo->privacy != NULL) {
 370                         data = (PrivacyDataPGP *) decinfo->privacy;
 371                 } else {
 372                         data = pgpmime_new_privacydata();
 373                         decinfo->privacy = (PrivacyData *) data;
 374                 }
 375                 data->done_sigtest = TRUE;
 376                 data->is_signed = TRUE;
 377                 data->sigstatus = sigstat;
 378                 if (data->ctx)
 379                         gpgme_release(data->ctx);
 380                 data->ctx = ctx;
 381         } else
 382                 gpgme_release(ctx);
 383
 384         return decinfo;
 385 }
 386
 387 gboolean pgpmime_sign(MimeInfo *mimeinfo, PrefsAccount *account)
 388 {
 389         MimeInfo *msgcontent, *sigmultipart, *newinfo;
 390         gchar *textstr, *micalg;
 391         FILE *fp;
 392         gchar *boundary = NULL;
 393         gchar *sigcontent;
 394         gpgme_ctx_t ctx;
 395         gpgme_data_t gpgtext, gpgsig;
 396         gpgme_error_t err;
 397         size_t len;
 398         struct passphrase_cb_info_s info;
 399         gpgme_sign_result_t result = NULL;
 400         gchar *test_msg;
 401
 402         fp = my_tmpfile();
 403         if (fp == NULL) {
 404                 privacy_set_error(_("Couldn't create temporary file: %s"), strerror(errno));
 405                 return FALSE;
 406         }
 407         procmime_write_mimeinfo(mimeinfo, fp);
 408         rewind(fp);
 409
 410         /* read temporary file into memory */
 411         test_msg = file_read_stream_to_str(fp);
 412         fclose(fp);
 413
 414         memset (&info, 0, sizeof info);
 415
 416         /* remove content node from message */
 417         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 418         g_node_unlink(msgcontent->node);
 419
 420         /* create temporary multipart for content */
 421         sigmultipart = procmime_mimeinfo_new();
 422         sigmultipart->type = MIMETYPE_MULTIPART;
 423         sigmultipart->subtype = g_strdup("signed");
 424
 425         do {
 426                 g_free(boundary);
 427                 boundary = generate_mime_boundary("Sig");
 428         } while (strstr(test_msg, boundary) != NULL);
 429
 430         g_free(test_msg);
 431
 432         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
 433                             g_strdup(boundary));
 434         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
 435                             g_strdup("application/pgp-signature"));
 436         g_node_append(sigmultipart->node, msgcontent->node);
 437         g_node_append(mimeinfo->node, sigmultipart->node);
 438
 439         /* write message content to temporary file */
 440         fp = my_tmpfile();
 441         if (fp == NULL) {
 442                 perror("my_tmpfile");
 443                 privacy_set_error(_("Couldn't create temporary file: %s"), strerror(errno));
 444                 return FALSE;
 445         }
 446         procmime_write_mimeinfo(sigmultipart, fp);
 447         rewind(fp);
 448
 449         /* read temporary file into memory */
 450         textstr = get_canonical_content(fp, boundary);
 451
 452         fclose(fp);
 453
 454         gpgme_data_new_from_mem(&gpgtext, textstr, strlen(textstr), 0);
 455         gpgme_data_new(&gpgsig);
 456         gpgme_new(&ctx);
 457         gpgme_set_textmode(ctx, 1);
 458         gpgme_set_armor(ctx, 1);
 459         gpgme_signers_clear (ctx);
 460
 461         if (!sgpgme_setup_signers(ctx, account)) {
 462                 gpgme_release(ctx);
 463                 return FALSE;
 464         }
 465
 466         if (getenv("GPG_AGENT_INFO")) {
 467                 debug_print("GPG_AGENT_INFO environment defined, running without passphrase callback\n");
 468         } else {
 469                 info.c = ctx;
 470                 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 471         }
 472
 473         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
 474         if (err != GPG_ERR_NO_ERROR) {
 475                 if (err == GPG_ERR_CANCELED) {
 476                         /* ignore cancelled signing */
 477                         privacy_reset_error();
 478                         debug_print("gpgme_op_sign cancelled\n");
 479                 } else {
 480                         privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
 481                         debug_print("gpgme_op_sign error : %x\n", err);
 482                 }
 483                 gpgme_release(ctx);
 484                 return FALSE;
 485         }
 486         result = gpgme_op_sign_result(ctx);
 487         if (result && result->signatures) {
 488                 gpgme_new_signature_t sig = result->signatures;
 489                 if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 490                         micalg = g_strdup_printf("PGP-%s", gpgme_hash_algo_name(
 491                                 result->signatures->hash_algo));
 492                 } else {
 493                         micalg = g_strdup(gpgme_hash_algo_name(
 494                                 result->signatures->hash_algo));
 495                 }
 496                 while (sig) {
 497                         debug_print("valid signature: %s\n", sig->fpr);
 498                         sig = sig->next;
 499                 }
 500         } else if (result && result->invalid_signers) {
 501                 gpgme_invalid_key_t invalid = result->invalid_signers;
 502                 while (invalid) {
 503                         g_warning("invalid signer: %s (%s)", invalid->fpr,
 504                                 gpgme_strerror(invalid->reason));
 505                         privacy_set_error(_("Data signing failed due to invalid signer: %s"),
 506                                 gpgme_strerror(invalid->reason));
 507                         invalid = invalid->next;
 508                 }
 509                 gpgme_release(ctx);
 510                 return FALSE;
 511         } else {
 512                 /* can't get result (maybe no signing key?) */
 513                 debug_print("gpgme_op_sign_result error\n");
 514                 privacy_set_error(_("Data signing failed, no results."));
 515                 gpgme_release(ctx);
 516                 return FALSE;
 517         }
 518
 519         gpgme_release(ctx);
 520         sigcontent = gpgme_data_release_and_get_mem(gpgsig, &len);
 521         gpgme_data_release(gpgtext);
 522         g_free(textstr);
 523
 524         if (sigcontent == NULL || len <= 0) {
 525                 g_warning("gpgme_data_release_and_get_mem failed");
 526                 privacy_set_error(_("Data signing failed, no contents."));
 527                 return FALSE;
 528         }
 529
 530         /* add signature */
 531         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
 532                             micalg);
 533
 534         newinfo = procmime_mimeinfo_new();
 535         newinfo->type = MIMETYPE_APPLICATION;
 536         newinfo->subtype = g_strdup("pgp-signature");
 537         g_hash_table_insert(newinfo->typeparameters, g_strdup("name"),
 538                              g_strdup("signature.asc"));
 539         newinfo->content = MIMECONTENT_MEM;
 540         newinfo->disposition = DISPOSITIONTYPE_ATTACHMENT;
 541         g_hash_table_insert(newinfo->dispositionparameters, g_strdup("filename"),
 542                             g_strdup("signature.asc"));
 543         newinfo->data.mem = g_malloc(len + 1);
 544         g_memmove(newinfo->data.mem, sigcontent, len);
 545         newinfo->data.mem[len] = '\0';
 546         g_node_append(sigmultipart->node, newinfo->node);
 547
 548         g_free(sigcontent);
 549
 550         return TRUE;
 551 }
 552 gchar *pgpmime_get_encrypt_data(GSList *recp_names)
 553 {
 554         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
 555 }
 556
 557 gboolean pgpmime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 558 {
 559         MimeInfo *msgcontent, *encmultipart, *newinfo;
 560         FILE *fp;
 561         gchar *boundary, *enccontent;
 562         size_t len;
 563         gchar *textstr;
 564         gpgme_data_t gpgtext = NULL, gpgenc = NULL;
 565         gpgme_ctx_t ctx = NULL;
 566         gpgme_key_t *kset = NULL;
 567         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 568         gint i = 0;
 569         gpgme_error_t err;
 570
 571         while (fprs[i] && strlen(fprs[i])) {
 572                 i++;
 573         }
 574
 575         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 576         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 577         gpgme_new(&ctx);
 578         i = 0;
 579         while (fprs[i] && strlen(fprs[i])) {
 580                 gpgme_key_t key;
 581                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 582                 if (err) {
 583                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 584                         privacy_set_error(_("Couldn't add GPG key %s, %s"), fprs[i], gpgme_strerror(err));
 585                         return FALSE;
 586                 }
 587                 debug_print("found %s at %d\n", fprs[i], i);
 588                 kset[i] = key;
 589                 i++;
 590         }
 591
 592         debug_print("Encrypting message content\n");
 593
 594         /* remove content node from message */
 595         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 596         g_node_unlink(msgcontent->node);
 597
 598         /* create temporary multipart for content */
 599         encmultipart = procmime_mimeinfo_new();
 600         encmultipart->type = MIMETYPE_MULTIPART;
 601         encmultipart->subtype = g_strdup("encrypted");
 602         boundary = generate_mime_boundary("Encrypt");
 603         g_hash_table_insert(encmultipart->typeparameters, g_strdup("boundary"),
 604                             g_strdup(boundary));
 605         g_hash_table_insert(encmultipart->typeparameters, g_strdup("protocol"),
 606                             g_strdup("application/pgp-encrypted"));
 607         g_node_append(encmultipart->node, msgcontent->node);
 608
 609         /* write message content to temporary file */
 610         fp = my_tmpfile();
 611         if (fp == NULL) {
 612                 privacy_set_error(_("Couldn't create temporary file, %s"), strerror(errno));
 613                 return FALSE;
 614         }
 615         procmime_write_mimeinfo(encmultipart, fp);
 616         rewind(fp);
 617
 618         /* read temporary file into memory */
 619         textstr = get_canonical_content(fp, boundary);
 620
 621         fclose(fp);
 622
 623         /* encrypt data */
 624         gpgme_data_new_from_mem(&gpgtext, textstr, strlen(textstr), 0);
 625         gpgme_data_new(&gpgenc);
 626         gpgme_set_armor(ctx, 1);
 627         gpgme_data_rewind(gpgtext);
 628
 629         err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 630
 631         gpgme_release(ctx);
 632         enccontent = gpgme_data_release_and_get_mem(gpgenc, &len);
 633         gpgme_data_release(gpgtext);
 634         g_free(textstr);
 635
 636         if (enccontent == NULL || len <= 0) {
 637                 g_warning("gpgme_data_release_and_get_mem failed");
 638                 privacy_set_error(_("Encryption failed, %s"), gpgme_strerror(err));
 639                 return FALSE;
 640         }
 641
 642         /* create encrypted multipart */
 643         g_node_unlink(msgcontent->node);
 644         procmime_mimeinfo_free_all(msgcontent);
 645         g_node_append(mimeinfo->node, encmultipart->node);
 646
 647         newinfo = procmime_mimeinfo_new();
 648         newinfo->type = MIMETYPE_APPLICATION;
 649         newinfo->subtype = g_strdup("pgp-encrypted");
 650         newinfo->content = MIMECONTENT_MEM;
 651         newinfo->data.mem = g_strdup("Version: 1\n");
 652         g_node_append(encmultipart->node, newinfo->node);
 653
 654         newinfo = procmime_mimeinfo_new();
 655         newinfo->type = MIMETYPE_APPLICATION;
 656         newinfo->subtype = g_strdup("octet-stream");
 657         newinfo->content = MIMECONTENT_MEM;
 658         newinfo->data.mem = g_malloc(len + 1);
 659         g_memmove(newinfo->data.mem, enccontent, len);
 660         newinfo->data.mem[len] = '\0';
 661         g_node_append(encmultipart->node, newinfo->node);
 662
 663         g_free(enccontent);
 664
 665         return TRUE;
 666 }
 667
 668 static PrivacySystem pgpmime_system = {
 669         "pgpmime",                      /* id */
 670         "PGP MIME",                     /* name */
 671
 672         pgpmime_free_privacydata,       /* free_privacydata */
 673
 674         pgpmime_is_signed,              /* is_signed(MimeInfo *) */
 675         pgpmime_check_signature,        /* check_signature(MimeInfo *) */
 676         pgpmime_get_sig_status,         /* get_sig_status(MimeInfo *) */
 677         pgpmime_get_sig_info_short,     /* get_sig_info_short(MimeInfo *) */
 678         pgpmime_get_sig_info_full,      /* get_sig_info_full(MimeInfo *) */
 679
 680         pgpmime_is_encrypted,           /* is_encrypted(MimeInfo *) */
 681         pgpmime_decrypt,                /* decrypt(MimeInfo *) */
 682
 683         TRUE,
 684         pgpmime_sign,
 685
 686         TRUE,
 687         pgpmime_get_encrypt_data,
 688         pgpmime_encrypt,
 689 };
 690
 691 void pgpmime_init()
 692 {
 693         privacy_register_system(&pgpmime_system);
 694 }
 695
 696 void pgpmime_done()
 697 {
 698         privacy_unregister_system(&pgpmime_system);
 699 }
 700
 701 struct PluginFeature *plugin_provides(void)
 702 {
 703         static struct PluginFeature features[] =
 704                 { {PLUGIN_PRIVACY, N_("PGP/Mime")},
 705                   {PLUGIN_NOTHING, NULL}};
 706         return features;
 707 }
 708 #endif /* USE_GPGME */