src/plugins/pgpmime/pgpmime.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2016 the Claws Mail team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #  include "config.h"
  21 #include "claws-features.h"
  22 #endif
  23
  24 #ifdef USE_GPGME
  25
  26 #include "defs.h"
  27 #include <glib.h>
  28 #include <glib/gi18n.h>
  29 #include <gpgme.h>
  30 #include <ctype.h>
  31 #include <errno.h>
  32
  33 #include "utils.h"
  34 #include "privacy.h"
  35 #include "procmime.h"
  36 #include "plugin.h"
  37
  38 #include "pgpmime.h"
  39 #include <plugins/pgpcore/sgpgme.h>
  40 #include <plugins/pgpcore/prefs_gpg.h>
  41 #include <plugins/pgpcore/passphrase.h>
  42 #include <plugins/pgpcore/pgp_utils.h>
  43
  44 #include "prefs_common.h"
  45
  46 typedef struct _PrivacyDataPGP PrivacyDataPGP;
  47
  48 struct _PrivacyDataPGP
  49 {
  50         PrivacyData     data;
  51
  52         gboolean        done_sigtest;
  53         gboolean        is_signed;
  54         gpgme_verify_result_t   sigstatus;
  55         gpgme_ctx_t     ctx;
  56 };
  57
  58 static PrivacySystem pgpmime_system;
  59
  60 static gint pgpmime_check_signature(MimeInfo *mimeinfo);
  61
  62 static PrivacyDataPGP *pgpmime_new_privacydata()
  63 {
  64         PrivacyDataPGP *data;
  65         gpgme_error_t err;
  66
  67         data = g_new0(PrivacyDataPGP, 1);
  68         data->data.system = &pgpmime_system;
  69         data->done_sigtest = FALSE;
  70         data->is_signed = FALSE;
  71         data->sigstatus = NULL;
  72         if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
  73                 g_warning("Couldn't initialize GPG context: %s", gpgme_strerror(err));
  74                 return NULL;
  75         }
  76
  77         return data;
  78 }
  79
  80 static void pgpmime_free_privacydata(PrivacyData *_data)
  81 {
  82         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
  83         gpgme_release(data->ctx);
  84         g_free(data);
  85 }
  86
  87 static gboolean pgpmime_is_signed(MimeInfo *mimeinfo)
  88 {
  89         MimeInfo *parent;
  90         MimeInfo *signature;
  91         const gchar *protocol;
  92         PrivacyDataPGP *data = NULL;
  93
  94         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
  95         if (mimeinfo->privacy != NULL) {
  96                 data = (PrivacyDataPGP *) mimeinfo->privacy;
  97                 if (data->done_sigtest)
  98                         return data->is_signed;
  99         }
 100
 101         /* check parent */
 102         parent = procmime_mimeinfo_parent(mimeinfo);
 103         if (parent == NULL)
 104                 return FALSE;
 105         if ((parent->type != MIMETYPE_MULTIPART) ||
 106             g_ascii_strcasecmp(parent->subtype, "signed"))
 107                 return FALSE;
 108         protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
 109         if ((protocol == NULL) ||
 110             (g_ascii_strcasecmp(protocol, "application/pgp-signature")))
 111                 return FALSE;
 112
 113         /* check if mimeinfo is the first child */
 114         if (parent->node->children->data != mimeinfo)
 115                 return FALSE;
 116
 117         /* check signature */
 118         signature = parent->node->children->next != NULL ?
 119             (MimeInfo *) parent->node->children->next->data : NULL;
 120         if (signature == NULL)
 121                 return FALSE;
 122         if ((signature->type != MIMETYPE_APPLICATION) ||
 123             (g_ascii_strcasecmp(signature->subtype, "pgp-signature")))
 124                 return FALSE;
 125
 126         if (data == NULL) {
 127                 data = pgpmime_new_privacydata();
 128                 mimeinfo->privacy = (PrivacyData *) data;
 129         }
 130         if (data != NULL) {
 131                 data->done_sigtest = TRUE;
 132                 data->is_signed = TRUE;
 133         }
 134
 135         return TRUE;
 136 }
 137
 138 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
 139 {
 140         gchar *ret;
 141         GString *textbuffer;
 142         guint boundary_len;
 143         gchar buf[BUFFSIZE];
 144
 145         boundary_len = strlen(boundary);
 146         while (fgets(buf, sizeof(buf), fp) != NULL)
 147                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 148                         break;
 149
 150         textbuffer = g_string_new("");
 151         while (fgets(buf, sizeof(buf), fp) != NULL) {
 152                 gchar *buf2;
 153
 154                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 155                         break;
 156
 157                 buf2 = canonicalize_str(buf);
 158                 g_string_append(textbuffer, buf2);
 159                 g_free(buf2);
 160         }
 161         g_string_truncate(textbuffer, textbuffer->len - 2);
 162
 163         ret = textbuffer->str;
 164         g_string_free(textbuffer, FALSE);
 165
 166         return ret;
 167 }
 168
 169 static gint pgpmime_check_signature(MimeInfo *mimeinfo)
 170 {
 171         PrivacyDataPGP *data;
 172         MimeInfo *parent, *signature;
 173         FILE *fp;
 174         gchar *boundary;
 175         gchar *textstr;
 176         gpgme_data_t sigdata = NULL, textdata = NULL;
 177         gpgme_error_t err;
 178         cm_return_val_if_fail(mimeinfo != NULL, -1);
 179         cm_return_val_if_fail(mimeinfo->privacy != NULL, -1);
 180         data = (PrivacyDataPGP *) mimeinfo->privacy;
 181         if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
 182                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 183                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 184                 return 0;
 185         }
 186
 187
 188         debug_print("Checking PGP/MIME signature\n");
 189
 190         err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_OpenPGP);
 191
 192         if (err) {
 193                 debug_print ("gpgme_set_protocol failed: %s\n",
 194                    gpgme_strerror (err));
 195         }
 196         parent = procmime_mimeinfo_parent(mimeinfo);
 197
 198         fp = g_fopen(parent->data.filename, "rb");
 199         cm_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
 200
 201         boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
 202         if (!boundary) {
 203                 privacy_set_error(_("Signature boundary not found."));
 204                 fclose(fp);
 205                 return 0;
 206         }
 207         textstr = get_canonical_content(fp, boundary);
 208
 209         err = gpgme_data_new_from_mem(&textdata, textstr, (size_t)strlen(textstr), 0);
 210         if (err) {
 211                 debug_print ("gpgme_data_new_from_mem failed: %s\n",
 212                    gpgme_strerror (err));
 213         }
 214         signature = (MimeInfo *) mimeinfo->node->next->data;
 215         sigdata = sgpgme_data_from_mimeinfo(signature);
 216
 217         err = 0;
 218         if (signature->encoding_type == ENC_BASE64) {
 219                 err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
 220         }
 221
 222         if (err) {
 223                 debug_print ("gpgme_data_set_encoding failed: %s\n",
 224                         gpgme_strerror (err));
 225         }
 226
 227         data->sigstatus =
 228                 sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
 229
 230         gpgme_data_release(sigdata);
 231         gpgme_data_release(textdata);
 232         g_free(textstr);
 233         fclose(fp);
 234
 235         return 0;
 236 }
 237
 238 static SignatureStatus pgpmime_get_sig_status(MimeInfo *mimeinfo)
 239 {
 240         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 241
 242         cm_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
 243
 244         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
 245 }
 246
 247 static gchar *pgpmime_get_sig_info_short(MimeInfo *mimeinfo)
 248 {
 249         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 250
 251         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 252
 253         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 254 }
 255
 256 static gchar *pgpmime_get_sig_info_full(MimeInfo *mimeinfo)
 257 {
 258         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 259
 260         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 261
 262         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
 263 }
 264
 265 static gboolean pgpmime_is_encrypted(MimeInfo *mimeinfo)
 266 {
 267         MimeInfo *tmpinfo;
 268         const gchar *tmpstr;
 269         const gchar *begin_indicator = "-----BEGIN PGP MESSAGE-----";
 270         const gchar *end_indicator = "-----END PGP MESSAGE-----";
 271         gchar *textdata;
 272
 273         if (mimeinfo->type != MIMETYPE_MULTIPART)
 274                 return FALSE;
 275         if (g_ascii_strcasecmp(mimeinfo->subtype, "encrypted"))
 276                 return FALSE;
 277         tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "protocol");
 278         if ((tmpstr == NULL) || g_ascii_strcasecmp(tmpstr, "application/pgp-encrypted"))
 279                 return FALSE;
 280         if (g_node_n_children(mimeinfo->node) != 2)
 281                 return FALSE;
 282
 283         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 0)->data;
 284         if (tmpinfo->type != MIMETYPE_APPLICATION)
 285                 return FALSE;
 286         if (g_ascii_strcasecmp(tmpinfo->subtype, "pgp-encrypted"))
 287                 return FALSE;
 288
 289         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 290         if (tmpinfo->type != MIMETYPE_APPLICATION)
 291                 return FALSE;
 292         if (g_ascii_strcasecmp(tmpinfo->subtype, "octet-stream"))
 293                 return FALSE;
 294
 295         textdata = get_part_as_string(tmpinfo);
 296         if (!textdata)
 297                 return FALSE;
 298
 299         if (!pgp_locate_armor_header(textdata, begin_indicator)) {
 300                 g_free(textdata);
 301                 return FALSE;
 302         }
 303         if (!pgp_locate_armor_header(textdata, end_indicator)) {
 304                 g_free(textdata);
 305                 return FALSE;
 306         }
 307
 308         g_free(textdata);
 309
 310         return TRUE;
 311 }
 312
 313 static MimeInfo *pgpmime_decrypt(MimeInfo *mimeinfo)
 314 {
 315         MimeInfo *encinfo, *decinfo, *parseinfo;
 316         gpgme_data_t cipher = NULL, plain = NULL;
 317         static gint id = 0;
 318         FILE *dstfp;
 319         gchar *fname;
 320         gpgme_verify_result_t sigstat = NULL;
 321         PrivacyDataPGP *data = NULL;
 322         gpgme_ctx_t ctx;
 323         gchar *chars;
 324         size_t len;
 325         gpgme_error_t err;
 326
 327         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 328                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 329                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 330                 return NULL;
 331         }
 332
 333         cm_return_val_if_fail(pgpmime_is_encrypted(mimeinfo), NULL);
 334
 335         encinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 336
 337         cipher = sgpgme_data_from_mimeinfo(encinfo);
 338         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 339
 340         gpgme_data_release(cipher);
 341         if (plain == NULL) {
 342                 debug_print("plain is null!\n");
 343                 gpgme_release(ctx);
 344                 return NULL;
 345         }
 346
 347         fname = g_strdup_printf("%s%cplaintext.%08x",
 348                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 349
 350         if ((dstfp = g_fopen(fname, "wb")) == NULL) {
 351                 FILE_OP_ERROR(fname, "fopen");
 352                 privacy_set_error(_("Couldn't open decrypted file %s"), fname);
 353                 g_free(fname);
 354                 gpgme_data_release(plain);
 355                 gpgme_release(ctx);
 356                 debug_print("can't open!\n");
 357                 return NULL;
 358         }
 359
 360         if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
 361                 FILE_OP_ERROR(fname, "fprintf");
 362                 fclose(dstfp);
 363                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 364                 g_free(fname);
 365                 gpgme_data_release(plain);
 366                 gpgme_release(ctx);
 367                 debug_print("can't open!\n");
 368                 return NULL;
 369         }
 370
 371         chars = sgpgme_data_release_and_get_mem(plain, &len);
 372         if (len > 0) {
 373                 if (fwrite(chars, 1, len, dstfp) < len) {
 374                         FILE_OP_ERROR(fname, "fwrite");
 375                         g_free(chars);
 376                         fclose(dstfp);
 377                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 378                         g_free(fname);
 379                         gpgme_data_release(plain);
 380                         gpgme_release(ctx);
 381                         debug_print("can't open!\n");
 382                         return NULL;
 383                 }
 384         }
 385         g_free(chars);
 386
 387         if (fclose(dstfp) == EOF) {
 388                 FILE_OP_ERROR(fname, "fclose");
 389                 privacy_set_error(_("Couldn't close decrypted file %s"), fname);
 390                 g_free(fname);
 391                 gpgme_data_release(plain);
 392                 gpgme_release(ctx);
 393                 debug_print("can't open!\n");
 394                 return NULL;
 395         }
 396
 397         parseinfo = procmime_scan_file(fname);
 398         g_free(fname);
 399         if (parseinfo == NULL) {
 400                 gpgme_release(ctx);
 401                 privacy_set_error(_("Couldn't parse decrypted file."));
 402                 return NULL;
 403         }
 404         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 405                 g_node_first_child(parseinfo->node)->data : NULL;
 406         if (decinfo == NULL) {
 407                 privacy_set_error(_("Couldn't parse decrypted file parts."));
 408                 gpgme_release(ctx);
 409                 return NULL;
 410         }
 411
 412         g_node_unlink(decinfo->node);
 413         procmime_mimeinfo_free_all(&parseinfo);
 414
 415         decinfo->tmp = TRUE;
 416
 417         if (sigstat != NULL && sigstat->signatures != NULL) {
 418                 if (decinfo->privacy != NULL) {
 419                         data = (PrivacyDataPGP *) decinfo->privacy;
 420                 } else {
 421                         data = pgpmime_new_privacydata();
 422                         decinfo->privacy = (PrivacyData *) data;
 423                 }
 424                 if (data != NULL) {
 425                         data->done_sigtest = TRUE;
 426                         data->is_signed = TRUE;
 427                         data->sigstatus = sigstat;
 428                         if (data->ctx)
 429                                 gpgme_release(data->ctx);
 430                         data->ctx = ctx;
 431                 }
 432         } else
 433                 gpgme_release(ctx);
 434
 435         return decinfo;
 436 }
 437
 438 gboolean pgpmime_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 439 {
 440         MimeInfo *msgcontent, *sigmultipart, *newinfo;
 441         gchar *textstr, *micalg = NULL;
 442         FILE *fp;
 443         gchar *boundary = NULL;
 444         gchar *sigcontent;
 445         gpgme_ctx_t ctx;
 446         gpgme_data_t gpgtext, gpgsig;
 447         gpgme_error_t err;
 448         size_t len;
 449         struct passphrase_cb_info_s info;
 450         gpgme_sign_result_t result = NULL;
 451         gchar *test_msg;
 452
 453         fp = my_tmpfile();
 454         if (fp == NULL) {
 455                 perror("my_tmpfile");
 456                 privacy_set_error(_("Couldn't create temporary file: %s"), g_strerror(errno));
 457                 return FALSE;
 458         }
 459         procmime_write_mimeinfo(mimeinfo, fp);
 460         rewind(fp);
 461
 462         /* read temporary file into memory */
 463         test_msg = file_read_stream_to_str(fp);
 464         fclose(fp);
 465
 466         memset (&info, 0, sizeof info);
 467
 468         /* remove content node from message */
 469         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 470         g_node_unlink(msgcontent->node);
 471
 472         /* create temporary multipart for content */
 473         sigmultipart = procmime_mimeinfo_new();
 474         sigmultipart->type = MIMETYPE_MULTIPART;
 475         sigmultipart->subtype = g_strdup("signed");
 476
 477         do {
 478                 g_free(boundary);
 479                 boundary = generate_mime_boundary("Sig");
 480         } while (strstr(test_msg, boundary) != NULL);
 481
 482         g_free(test_msg);
 483
 484         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
 485                             g_strdup(boundary));
 486         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
 487                             g_strdup("application/pgp-signature"));
 488         g_node_append(sigmultipart->node, msgcontent->node);
 489         g_node_append(mimeinfo->node, sigmultipart->node);
 490
 491         /* write message content to temporary file */
 492         fp = my_tmpfile();
 493         if (fp == NULL) {
 494                 perror("my_tmpfile");
 495                 privacy_set_error(_("Couldn't create temporary file: %s"), g_strerror(errno));
 496                 return FALSE;
 497         }
 498         procmime_write_mimeinfo(sigmultipart, fp);
 499         rewind(fp);
 500
 501         /* read temporary file into memory */
 502         textstr = get_canonical_content(fp, boundary);
 503
 504         fclose(fp);
 505
 506         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 507         gpgme_data_new(&gpgsig);
 508         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 509                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 510                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 511                 return FALSE;
 512         }
 513         gpgme_set_textmode(ctx, 1);
 514         gpgme_set_armor(ctx, 1);
 515         gpgme_signers_clear (ctx);
 516
 517         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 518                 gpgme_release(ctx);
 519                 return FALSE;
 520         }
 521
 522         prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
 523         if (g_getenv("GPG_AGENT_INFO") && prefs_gpg_get_config()->use_gpg_agent) {
 524                 debug_print("GPG_AGENT_INFO environment defined, running without passphrase callback\n");
 525         } else {
 526                 info.c = ctx;
 527                 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 528         }
 529
 530         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
 531         if (err != GPG_ERR_NO_ERROR) {
 532                 if (err == GPG_ERR_CANCELED) {
 533                         /* ignore cancelled signing */
 534                         privacy_reset_error();
 535                         debug_print("gpgme_op_sign cancelled\n");
 536                 } else {
 537                         privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
 538                         debug_print("gpgme_op_sign error : %x\n", err);
 539                 }
 540                 gpgme_release(ctx);
 541                 return FALSE;
 542         }
 543         result = gpgme_op_sign_result(ctx);
 544         if (result && result->signatures) {
 545                 gpgme_new_signature_t sig = result->signatures;
 546                 if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 547                         gchar *down_algo = g_ascii_strdown(gpgme_hash_algo_name(
 548                                 result->signatures->hash_algo), -1);
 549                         micalg = g_strdup_printf("pgp-%s", down_algo);
 550                         g_free(down_algo);
 551                 } else {
 552                         micalg = g_strdup(gpgme_hash_algo_name(
 553                                 result->signatures->hash_algo));
 554                 }
 555                 while (sig) {
 556                         debug_print("valid signature: %s\n", sig->fpr);
 557                         sig = sig->next;
 558                 }
 559         } else if (result && result->invalid_signers) {
 560                 gpgme_invalid_key_t invalid = result->invalid_signers;
 561                 while (invalid) {
 562                         g_warning("invalid signer: %s (%s)", invalid->fpr,
 563                                 gpgme_strerror(invalid->reason));
 564                         privacy_set_error(_("Data signing failed due to invalid signer: %s"),
 565                                 gpgme_strerror(invalid->reason));
 566                         invalid = invalid->next;
 567                 }
 568                 gpgme_release(ctx);
 569                 return FALSE;
 570         } else {
 571                 /* can't get result (maybe no signing key?) */
 572                 debug_print("gpgme_op_sign_result error\n");
 573                 privacy_set_error(_("Data signing failed, no results."));
 574                 gpgme_release(ctx);
 575                 return FALSE;
 576         }
 577
 578         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 579         gpgme_data_release(gpgtext);
 580         g_free(textstr);
 581
 582         if (sigcontent == NULL || len <= 0) {
 583                 g_warning("sgpgme_data_release_and_get_mem failed");
 584                 privacy_set_error(_("Data signing failed, no contents."));
 585                 g_free(micalg);
 586                 g_free(sigcontent);
 587                 return FALSE;
 588         }
 589
 590         /* add signature */
 591         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
 592                             micalg);
 593
 594         newinfo = procmime_mimeinfo_new();
 595         newinfo->type = MIMETYPE_APPLICATION;
 596         newinfo->subtype = g_strdup("pgp-signature");
 597         newinfo->description = g_strdup(_("OpenPGP digital signature"));
 598         newinfo->content = MIMECONTENT_MEM;
 599         newinfo->data.mem = g_malloc(len + 1);
 600         g_memmove(newinfo->data.mem, sigcontent, len);
 601         newinfo->data.mem[len] = '\0';
 602         newinfo->disposition = DISPOSITIONTYPE_INLINE;
 603         g_hash_table_insert(newinfo->dispositionparameters,
 604                         g_strdup("filename"), g_strdup("signature.asc"));
 605
 606         g_node_append(sigmultipart->node, newinfo->node);
 607
 608         g_free(sigcontent);
 609         gpgme_release(ctx);
 610
 611         return TRUE;
 612 }
 613 gchar *pgpmime_get_encrypt_data(GSList *recp_names)
 614 {
 615         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
 616 }
 617
 618 static const gchar *pgpmime_get_encrypt_warning(void)
 619 {
 620         if (prefs_gpg_should_skip_encryption_warning(pgpmime_system.id))
 621                 return NULL;
 622         else
 623                 return _("Please note that email headers, like Subject, "
 624                          "are not encrypted by the PGP/Mime system.");
 625 }
 626
 627 static void pgpmime_inhibit_encrypt_warning(gboolean inhibit)
 628 {
 629         if (inhibit)
 630                 prefs_gpg_add_skip_encryption_warning(pgpmime_system.id);
 631         else
 632                 prefs_gpg_remove_skip_encryption_warning(pgpmime_system.id);
 633 }
 634
 635 gboolean pgpmime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 636 {
 637         MimeInfo *msgcontent, *encmultipart, *newinfo;
 638         FILE *fp;
 639         gchar *boundary, *enccontent;
 640         size_t len;
 641         gchar *textstr;
 642         gpgme_data_t gpgtext = NULL, gpgenc = NULL;
 643         gpgme_ctx_t ctx = NULL;
 644         gpgme_key_t *kset = NULL;
 645         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 646         gint i = 0;
 647         gpgme_error_t err;
 648
 649         while (fprs[i] && strlen(fprs[i])) {
 650                 i++;
 651         }
 652
 653         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 654         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 655         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 656                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 657                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 658                 g_free(kset);
 659                 return FALSE;
 660         }
 661         i = 0;
 662         while (fprs[i] && strlen(fprs[i])) {
 663                 gpgme_key_t key;
 664                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 665                 if (err) {
 666                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 667                         privacy_set_error(_("Couldn't add GPG key %s, %s"), fprs[i], gpgme_strerror(err));
 668                         g_free(kset);
 669                         return FALSE;
 670                 }
 671                 debug_print("found %s at %d\n", fprs[i], i);
 672                 kset[i] = key;
 673                 i++;
 674         }
 675
 676         debug_print("Encrypting message content\n");
 677
 678         /* remove content node from message */
 679         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 680         g_node_unlink(msgcontent->node);
 681
 682         /* create temporary multipart for content */
 683         encmultipart = procmime_mimeinfo_new();
 684         encmultipart->type = MIMETYPE_MULTIPART;
 685         encmultipart->subtype = g_strdup("encrypted");
 686         boundary = generate_mime_boundary("Encrypt");
 687         g_hash_table_insert(encmultipart->typeparameters, g_strdup("boundary"),
 688                             g_strdup(boundary));
 689         g_hash_table_insert(encmultipart->typeparameters, g_strdup("protocol"),
 690                             g_strdup("application/pgp-encrypted"));
 691         g_node_append(encmultipart->node, msgcontent->node);
 692
 693         /* write message content to temporary file */
 694         fp = my_tmpfile();
 695         if (fp == NULL) {
 696                 perror("my_tmpfile");
 697                 privacy_set_error(_("Couldn't create temporary file, %s"), g_strerror(errno));
 698                 g_free(kset);
 699                 return FALSE;
 700         }
 701         procmime_write_mimeinfo(encmultipart, fp);
 702         rewind(fp);
 703
 704         /* read temporary file into memory */
 705         textstr = get_canonical_content(fp, boundary);
 706
 707         fclose(fp);
 708
 709         /* encrypt data */
 710         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 711         gpgme_data_new(&gpgenc);
 712         gpgme_set_armor(ctx, 1);
 713         cm_gpgme_data_rewind(gpgtext);
 714
 715         err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 716
 717         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 718         gpgme_data_release(gpgtext);
 719         g_free(textstr);
 720         g_free(kset);
 721
 722         if (enccontent == NULL || len <= 0) {
 723                 g_warning("sgpgme_data_release_and_get_mem failed");
 724                 privacy_set_error(_("Encryption failed, %s"), gpgme_strerror(err));
 725                 gpgme_release(ctx);
 726                 g_free(enccontent);
 727                 return FALSE;
 728         }
 729
 730         /* create encrypted multipart */
 731         g_node_unlink(msgcontent->node);
 732         procmime_mimeinfo_free_all(&msgcontent);
 733         g_node_append(mimeinfo->node, encmultipart->node);
 734
 735         newinfo = procmime_mimeinfo_new();
 736         newinfo->type = MIMETYPE_APPLICATION;
 737         newinfo->subtype = g_strdup("pgp-encrypted");
 738         newinfo->content = MIMECONTENT_MEM;
 739         newinfo->data.mem = g_strdup("Version: 1\n");
 740         g_node_append(encmultipart->node, newinfo->node);
 741
 742         newinfo = procmime_mimeinfo_new();
 743         newinfo->type = MIMETYPE_APPLICATION;
 744         newinfo->subtype = g_strdup("octet-stream");
 745         newinfo->content = MIMECONTENT_MEM;
 746         newinfo->data.mem = g_malloc(len + 1);
 747         g_memmove(newinfo->data.mem, enccontent, len);
 748         newinfo->data.mem[len] = '\0';
 749         g_node_append(encmultipart->node, newinfo->node);
 750
 751         g_free(enccontent);
 752         gpgme_release(ctx);
 753
 754         return TRUE;
 755 }
 756
 757 static PrivacySystem pgpmime_system = {
 758         "pgpmime",                      /* id */
 759         "PGP MIME",                     /* name */
 760
 761         pgpmime_free_privacydata,       /* free_privacydata */
 762
 763         pgpmime_is_signed,              /* is_signed(MimeInfo *) */
 764         pgpmime_check_signature,        /* check_signature(MimeInfo *) */
 765         pgpmime_get_sig_status,         /* get_sig_status(MimeInfo *) */
 766         pgpmime_get_sig_info_short,     /* get_sig_info_short(MimeInfo *) */
 767         pgpmime_get_sig_info_full,      /* get_sig_info_full(MimeInfo *) */
 768
 769         pgpmime_is_encrypted,           /* is_encrypted(MimeInfo *) */
 770         pgpmime_decrypt,                /* decrypt(MimeInfo *) */
 771
 772         TRUE,
 773         pgpmime_sign,
 774
 775         TRUE,
 776         pgpmime_get_encrypt_data,
 777         pgpmime_encrypt,
 778         pgpmime_get_encrypt_warning,
 779         pgpmime_inhibit_encrypt_warning,
 780         prefs_gpg_auto_check_signatures,
 781 };
 782
 783 void pgpmime_init()
 784 {
 785         privacy_register_system(&pgpmime_system);
 786 }
 787
 788 void pgpmime_done()
 789 {
 790         privacy_unregister_system(&pgpmime_system);
 791 }
 792
 793 struct PluginFeature *plugin_provides(void)
 794 {
 795         static struct PluginFeature features[] =
 796                 { {PLUGIN_PRIVACY, N_("PGP/Mime")},
 797                   {PLUGIN_NOTHING, NULL}};
 798         return features;
 799 }
 800 #endif /* USE_GPGME */