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         gpgme_error_t err;
  65
  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));
  73                 return NULL;
  74         }
  75
  76         return data;
  77 }
  78
  79 static void pgpmime_free_privacydata(PrivacyData *_data)
  80 {
  81         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
  82         gpgme_release(data->ctx);
  83         g_free(data);
  84 }
  85
  86 static gboolean pgpmime_is_signed(MimeInfo *mimeinfo)
  87 {
  88         MimeInfo *parent;
  89         MimeInfo *signature;
  90         const gchar *protocol;
  91         PrivacyDataPGP *data = NULL;
  92
  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;
  98         }
  99
 100         /* check parent */
 101         parent = procmime_mimeinfo_parent(mimeinfo);
 102         if (parent == NULL)
 103                 return FALSE;
 104         if ((parent->type != MIMETYPE_MULTIPART) ||
 105             g_ascii_strcasecmp(parent->subtype, "signed"))
 106                 return FALSE;
 107         protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
 108         if ((protocol == NULL) ||
 109             (g_ascii_strcasecmp(protocol, "application/pgp-signature")))
 110                 return FALSE;
 111
 112         /* check if mimeinfo is the first child */
 113         if (parent->node->children->data != mimeinfo)
 114                 return FALSE;
 115
 116         /* check signature */
 117         signature = parent->node->children->next != NULL ?
 118             (MimeInfo *) parent->node->children->next->data : NULL;
 119         if (signature == NULL)
 120                 return FALSE;
 121         if ((signature->type != MIMETYPE_APPLICATION) ||
 122             (g_ascii_strcasecmp(signature->subtype, "pgp-signature")))
 123                 return FALSE;
 124
 125         if (data == NULL) {
 126                 data = pgpmime_new_privacydata();
 127                 mimeinfo->privacy = (PrivacyData *) data;
 128         }
 129
 130         data->done_sigtest = TRUE;
 131         data->is_signed = TRUE;
 132
 133         return TRUE;
 134 }
 135
 136 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
 137 {
 138         gchar *ret;
 139         GString *textbuffer;
 140         guint boundary_len;
 141         gchar buf[BUFFSIZE];
 142
 143         boundary_len = strlen(boundary);
 144         while (fgets(buf, sizeof(buf), fp) != NULL)
 145                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 146                         break;
 147
 148         textbuffer = g_string_new("");
 149         while (fgets(buf, sizeof(buf), fp) != NULL) {
 150                 gchar *buf2;
 151
 152                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 153                         break;
 154
 155                 buf2 = canonicalize_str(buf);
 156                 g_string_append(textbuffer, buf2);
 157                 g_free(buf2);
 158         }
 159         g_string_truncate(textbuffer, textbuffer->len - 2);
 160
 161         ret = textbuffer->str;
 162         g_string_free(textbuffer, FALSE);
 163
 164         return ret;
 165 }
 166
 167 static gint pgpmime_check_signature(MimeInfo *mimeinfo)
 168 {
 169         PrivacyDataPGP *data;
 170         MimeInfo *parent, *signature;
 171         FILE *fp;
 172         gchar *boundary;
 173         gchar *textstr;
 174         gpgme_data_t sigdata = NULL, textdata = NULL;
 175         gpgme_error_t err;
 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));
 182                 return 0;
 183         }
 184
 185
 186         debug_print("Checking PGP/MIME signature\n");
 187
 188         err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_OpenPGP);
 189
 190         if (err) {
 191                 debug_print ("gpgme_set_protocol failed: %s\n",
 192                    gpgme_strerror (err));
 193         }
 194         parent = procmime_mimeinfo_parent(mimeinfo);
 195
 196         fp = g_fopen(parent->data.filename, "rb");
 197         g_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
 198
 199         boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
 200         if (!boundary) {
 201                 privacy_set_error(_("Signature boundary not found."));
 202                 return 0;
 203         }
 204         textstr = get_canonical_content(fp, boundary);
 205
 206         err = gpgme_data_new_from_mem(&textdata, textstr, strlen(textstr), 0);
 207         if (err) {
 208                 debug_print ("gpgme_data_new_from_mem failed: %s\n",
 209                    gpgme_strerror (err));
 210         }
 211         signature = (MimeInfo *) mimeinfo->node->next->data;
 212         sigdata = sgpgme_data_from_mimeinfo(signature);
 213
 214         err = 0;
 215         if (signature->encoding_type == ENC_BASE64) {
 216                 err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
 217         }
 218
 219         if (err) {
 220                 debug_print ("gpgme_data_set_encoding failed: %s\n",
 221                         gpgme_strerror (err));
 222         }
 223
 224         data->sigstatus =
 225                 sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
 226
 227         gpgme_data_release(sigdata);
 228         gpgme_data_release(textdata);
 229         g_free(textstr);
 230         fclose(fp);
 231
 232         return 0;
 233 }
 234
 235 static SignatureStatus pgpmime_get_sig_status(MimeInfo *mimeinfo)
 236 {
 237         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 238
 239         g_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
 240
 241         if (data->sigstatus == NULL &&
 242             prefs_gpg_get_config()->auto_check_signatures)
 243                 pgpmime_check_signature(mimeinfo);
 244
 245         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
 246 }
 247
 248 static gchar *pgpmime_get_sig_info_short(MimeInfo *mimeinfo)
 249 {
 250         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 251
 252         g_return_val_if_fail(data != NULL, g_strdup("Error"));
 253
 254         if (data->sigstatus == NULL &&
 255             prefs_gpg_get_config()->auto_check_signatures)
 256                 pgpmime_check_signature(mimeinfo);
 257
 258         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 259 }
 260
 261 static gchar *pgpmime_get_sig_info_full(MimeInfo *mimeinfo)
 262 {
 263         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 264
 265         g_return_val_if_fail(data != NULL, g_strdup("Error"));
 266
 267         if (data->sigstatus == NULL &&
 268             prefs_gpg_get_config()->auto_check_signatures)
 269                 pgpmime_check_signature(mimeinfo);
 270
 271         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
 272 }
 273
 274 static gboolean pgpmime_is_encrypted(MimeInfo *mimeinfo)
 275 {
 276         MimeInfo *tmpinfo;
 277         const gchar *tmpstr;
 278
 279         if (mimeinfo->type != MIMETYPE_MULTIPART)
 280                 return FALSE;
 281         if (g_ascii_strcasecmp(mimeinfo->subtype, "encrypted"))
 282                 return FALSE;
 283         tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "protocol");
 284         if ((tmpstr == NULL) || g_ascii_strcasecmp(tmpstr, "application/pgp-encrypted"))
 285                 return FALSE;
 286         if (g_node_n_children(mimeinfo->node) != 2)
 287                 return FALSE;
 288
 289         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 0)->data;
 290         if (tmpinfo->type != MIMETYPE_APPLICATION)
 291                 return FALSE;
 292         if (g_ascii_strcasecmp(tmpinfo->subtype, "pgp-encrypted"))
 293                 return FALSE;
 294
 295         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 296         if (tmpinfo->type != MIMETYPE_APPLICATION)
 297                 return FALSE;
 298         if (g_ascii_strcasecmp(tmpinfo->subtype, "octet-stream"))
 299                 return FALSE;
 300
 301         return TRUE;
 302 }
 303
 304 static MimeInfo *pgpmime_decrypt(MimeInfo *mimeinfo)
 305 {
 306         MimeInfo *encinfo, *decinfo, *parseinfo;
 307         gpgme_data_t cipher = NULL, plain = NULL;
 308         static gint id = 0;
 309         FILE *dstfp;
 310         gchar *fname;
 311         gpgme_verify_result_t sigstat = NULL;
 312         PrivacyDataPGP *data = NULL;
 313         gpgme_ctx_t ctx;
 314         gchar *chars;
 315         size_t len;
 316         gpgme_error_t err;
 317
 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));
 321                 return NULL;
 322         }
 323
 324         g_return_val_if_fail(pgpmime_is_encrypted(mimeinfo), NULL);
 325
 326         encinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 327
 328         cipher = sgpgme_data_from_mimeinfo(encinfo);
 329         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 330
 331         gpgme_data_release(cipher);
 332         if (plain == NULL) {
 333                 debug_print("plain is null!\n");
 334                 gpgme_release(ctx);
 335                 return NULL;
 336         }
 337
 338         fname = g_strdup_printf("%s%cplaintext.%08x",
 339                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 340
 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);
 344                 g_free(fname);
 345                 gpgme_data_release(plain);
 346                 gpgme_release(ctx);
 347                 debug_print("can't open!\n");
 348                 return NULL;
 349         }
 350
 351         fprintf(dstfp, "MIME-Version: 1.0\n");
 352
 353         chars = gpgme_data_release_and_get_mem(plain, &len);
 354         if (len > 0)
 355                 fwrite(chars, len, 1, dstfp);
 356         fclose(dstfp);
 357
 358         parseinfo = procmime_scan_file(fname);
 359         g_free(fname);
 360         if (parseinfo == NULL) {
 361                 gpgme_release(ctx);
 362                 privacy_set_error(_("Couldn't parse decrypted file."));
 363                 return NULL;
 364         }
 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."));
 369                 gpgme_release(ctx);
 370                 return NULL;
 371         }
 372
 373         g_node_unlink(decinfo->node);
 374         procmime_mimeinfo_free_all(parseinfo);
 375
 376         decinfo->tmp = TRUE;
 377
 378         if (sigstat != NULL && sigstat->signatures != NULL) {
 379                 if (decinfo->privacy != NULL) {
 380                         data = (PrivacyDataPGP *) decinfo->privacy;
 381                 } else {
 382                         data = pgpmime_new_privacydata();
 383                         decinfo->privacy = (PrivacyData *) data;
 384                 }
 385                 data->done_sigtest = TRUE;
 386                 data->is_signed = TRUE;
 387                 data->sigstatus = sigstat;
 388                 if (data->ctx)
 389                         gpgme_release(data->ctx);
 390                 data->ctx = ctx;
 391         } else
 392                 gpgme_release(ctx);
 393
 394         return decinfo;
 395 }
 396
 397 gboolean pgpmime_sign(MimeInfo *mimeinfo, PrefsAccount *account)
 398 {
 399         MimeInfo *msgcontent, *sigmultipart, *newinfo;
 400         gchar *textstr, *micalg;
 401         FILE *fp;
 402         gchar *boundary = NULL;
 403         gchar *sigcontent;
 404         gpgme_ctx_t ctx;
 405         gpgme_data_t gpgtext, gpgsig;
 406         gpgme_error_t err;
 407         size_t len;
 408         struct passphrase_cb_info_s info;
 409         gpgme_sign_result_t result = NULL;
 410         gchar *test_msg;
 411
 412         fp = my_tmpfile();
 413         if (fp == NULL) {
 414                 privacy_set_error(_("Couldn't create temporary file: %s"), strerror(errno));
 415                 return FALSE;
 416         }
 417         procmime_write_mimeinfo(mimeinfo, fp);
 418         rewind(fp);
 419
 420         /* read temporary file into memory */
 421         test_msg = file_read_stream_to_str(fp);
 422         fclose(fp);
 423
 424         memset (&info, 0, sizeof info);
 425
 426         /* remove content node from message */
 427         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 428         g_node_unlink(msgcontent->node);
 429
 430         /* create temporary multipart for content */
 431         sigmultipart = procmime_mimeinfo_new();
 432         sigmultipart->type = MIMETYPE_MULTIPART;
 433         sigmultipart->subtype = g_strdup("signed");
 434
 435         do {
 436                 g_free(boundary);
 437                 boundary = generate_mime_boundary("Sig");
 438         } while (strstr(test_msg, boundary) != NULL);
 439
 440         g_free(test_msg);
 441
 442         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
 443                             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);
 448
 449         /* write message content to temporary file */
 450         fp = my_tmpfile();
 451         if (fp == NULL) {
 452                 perror("my_tmpfile");
 453                 privacy_set_error(_("Couldn't create temporary file: %s"), strerror(errno));
 454                 return FALSE;
 455         }
 456         procmime_write_mimeinfo(sigmultipart, fp);
 457         rewind(fp);
 458
 459         /* read temporary file into memory */
 460         textstr = get_canonical_content(fp, boundary);
 461
 462         fclose(fp);
 463
 464         gpgme_data_new_from_mem(&gpgtext, textstr, 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));
 469                 return FALSE;
 470         }
 471         gpgme_set_textmode(ctx, 1);
 472         gpgme_set_armor(ctx, 1);
 473         gpgme_signers_clear (ctx);
 474
 475         if (!sgpgme_setup_signers(ctx, account)) {
 476                 gpgme_release(ctx);
 477                 return FALSE;
 478         }
 479
 480         if (getenv("GPG_AGENT_INFO")) {
 481                 debug_print("GPG_AGENT_INFO environment defined, running without passphrase callback\n");
 482         } else {
 483                 info.c = ctx;
 484                 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 485         }
 486
 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");
 493                 } else {
 494                         privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
 495                         debug_print("gpgme_op_sign error : %x\n", err);
 496                 }
 497                 gpgme_release(ctx);
 498                 return FALSE;
 499         }
 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));
 506                 } else {
 507                         micalg = g_strdup(gpgme_hash_algo_name(
 508                                 result->signatures->hash_algo));
 509                 }
 510                 while (sig) {
 511                         debug_print("valid signature: %s\n", sig->fpr);
 512                         sig = sig->next;
 513                 }
 514         } else if (result && result->invalid_signers) {
 515                 gpgme_invalid_key_t invalid = result->invalid_signers;
 516                 while (invalid) {
 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;
 522                 }
 523                 gpgme_release(ctx);
 524                 return FALSE;
 525         } else {
 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."));
 529                 gpgme_release(ctx);
 530                 return FALSE;
 531         }
 532
 533         sigcontent = gpgme_data_release_and_get_mem(gpgsig, &len);
 534         gpgme_data_release(gpgtext);
 535         g_free(textstr);
 536
 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."));
 540                 return FALSE;
 541         }
 542
 543         /* add signature */
 544         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
 545                             micalg);
 546
 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);
 560
 561         g_free(sigcontent);
 562         gpgme_release(ctx);
 563
 564         return TRUE;
 565 }
 566 gchar *pgpmime_get_encrypt_data(GSList *recp_names)
 567 {
 568         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
 569 }
 570
 571 gboolean pgpmime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 572 {
 573         MimeInfo *msgcontent, *encmultipart, *newinfo;
 574         FILE *fp;
 575         gchar *boundary, *enccontent;
 576         size_t len;
 577         gchar *textstr;
 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);
 582         gint i = 0;
 583         gpgme_error_t err;
 584
 585         while (fprs[i] && strlen(fprs[i])) {
 586                 i++;
 587         }
 588
 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));
 594                 return FALSE;
 595         }
 596         i = 0;
 597         while (fprs[i] && strlen(fprs[i])) {
 598                 gpgme_key_t key;
 599                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 600                 if (err) {
 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));
 603                         return FALSE;
 604                 }
 605                 debug_print("found %s at %d\n", fprs[i], i);
 606                 kset[i] = key;
 607                 i++;
 608         }
 609
 610         debug_print("Encrypting message content\n");
 611
 612         /* remove content node from message */
 613         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 614         g_node_unlink(msgcontent->node);
 615
 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"),
 622                             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);
 626
 627         /* write message content to temporary file */
 628         fp = my_tmpfile();
 629         if (fp == NULL) {
 630                 privacy_set_error(_("Couldn't create temporary file, %s"), strerror(errno));
 631                 return FALSE;
 632         }
 633         procmime_write_mimeinfo(encmultipart, fp);
 634         rewind(fp);
 635
 636         /* read temporary file into memory */
 637         textstr = get_canonical_content(fp, boundary);
 638
 639         fclose(fp);
 640
 641         /* encrypt data */
 642         gpgme_data_new_from_mem(&gpgtext, textstr, strlen(textstr), 0);
 643         gpgme_data_new(&gpgenc);
 644         gpgme_set_armor(ctx, 1);
 645         gpgme_data_rewind(gpgtext);
 646
 647         err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 648
 649         enccontent = gpgme_data_release_and_get_mem(gpgenc, &len);
 650         gpgme_data_release(gpgtext);
 651         g_free(textstr);
 652
 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));
 656                 gpgme_release(ctx);
 657                 return FALSE;
 658         }
 659
 660         /* create encrypted multipart */
 661         g_node_unlink(msgcontent->node);
 662         procmime_mimeinfo_free_all(msgcontent);
 663         g_node_append(mimeinfo->node, encmultipart->node);
 664
 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);
 671
 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);
 680
 681         g_free(enccontent);
 682         gpgme_release(ctx);
 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_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 *) */
 698
 699         pgpmime_is_encrypted,           /* is_encrypted(MimeInfo *) */
 700         pgpmime_decrypt,                /* decrypt(MimeInfo *) */
 701
 702         TRUE,
 703         pgpmime_sign,
 704
 705         TRUE,
 706         pgpmime_get_encrypt_data,
 707         pgpmime_encrypt,
 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 */