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 #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         gpgme_verify_result_t   sigstatus;
  56         gpgme_ctx_t     ctx;
  57 };
  58
  59 static PrivacySystem pgpmime_system;
  60
  61 static gint pgpmime_check_signature(MimeInfo *mimeinfo);
  62
  63 static PrivacyDataPGP *pgpmime_new_privacydata()
  64 {
  65         PrivacyDataPGP *data;
  66         gpgme_error_t err;
  67
  68         data = g_new0(PrivacyDataPGP, 1);
  69         data->data.system = &pgpmime_system;
  70         data->done_sigtest = FALSE;
  71         data->is_signed = FALSE;
  72         data->sigstatus = NULL;
  73         if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
  74                 g_warning("couldn't initialize GPG context: %s", gpgme_strerror(err));
  75         g_free(data);
  76                 return NULL;
  77         }
  78
  79         return data;
  80 }
  81
  82 static void pgpmime_free_privacydata(PrivacyData *_data)
  83 {
  84         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
  85         gpgme_release(data->ctx);
  86         g_free(data);
  87 }
  88
  89 static gboolean pgpmime_is_signed(MimeInfo *mimeinfo)
  90 {
  91         MimeInfo *parent;
  92         MimeInfo *signature;
  93         const gchar *protocol;
  94         PrivacyDataPGP *data = NULL;
  95
  96         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
  97         if (mimeinfo->privacy != NULL) {
  98                 data = (PrivacyDataPGP *) mimeinfo->privacy;
  99                 if (data->done_sigtest)
 100                         return data->is_signed;
 101         }
 102
 103         /* check parent */
 104         parent = procmime_mimeinfo_parent(mimeinfo);
 105         if (parent == NULL)
 106                 return FALSE;
 107         if ((parent->type != MIMETYPE_MULTIPART) ||
 108             g_ascii_strcasecmp(parent->subtype, "signed"))
 109                 return FALSE;
 110         protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
 111         if ((protocol == NULL) ||
 112             (g_ascii_strcasecmp(protocol, "application/pgp-signature")))
 113                 return FALSE;
 114
 115         /* check if mimeinfo is the first child */
 116         if (parent->node->children->data != mimeinfo)
 117                 return FALSE;
 118
 119         /* check signature */
 120         signature = parent->node->children->next != NULL ?
 121             (MimeInfo *) parent->node->children->next->data : NULL;
 122         if (signature == NULL)
 123                 return FALSE;
 124         if ((signature->type != MIMETYPE_APPLICATION) ||
 125             (g_ascii_strcasecmp(signature->subtype, "pgp-signature")))
 126                 return FALSE;
 127
 128         if (data == NULL) {
 129                 data = pgpmime_new_privacydata();
 130                 mimeinfo->privacy = (PrivacyData *) data;
 131         }
 132         if (data != NULL) {
 133                 data->done_sigtest = TRUE;
 134                 data->is_signed = TRUE;
 135         }
 136
 137         return TRUE;
 138 }
 139
 140 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
 141 {
 142         gchar *ret;
 143         GString *textbuffer;
 144         guint boundary_len;
 145         gchar buf[BUFFSIZE];
 146
 147         boundary_len = strlen(boundary);
 148         while (claws_fgets(buf, sizeof(buf), fp) != NULL)
 149                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 150                         break;
 151
 152         textbuffer = g_string_new("");
 153         while (claws_fgets(buf, sizeof(buf), fp) != NULL) {
 154                 gchar *buf2;
 155
 156                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 157                         break;
 158
 159                 buf2 = canonicalize_str(buf);
 160                 g_string_append(textbuffer, buf2);
 161                 g_free(buf2);
 162         }
 163         g_string_truncate(textbuffer, textbuffer->len - 2);
 164
 165         ret = textbuffer->str;
 166         g_string_free(textbuffer, FALSE);
 167
 168         return ret;
 169 }
 170
 171 static gint pgpmime_check_signature(MimeInfo *mimeinfo)
 172 {
 173         PrivacyDataPGP *data;
 174         MimeInfo *parent, *signature;
 175         FILE *fp;
 176         gchar *boundary;
 177         gchar *textstr;
 178         gpgme_data_t sigdata = NULL, textdata = NULL;
 179         gpgme_error_t err;
 180         cm_return_val_if_fail(mimeinfo != NULL, -1);
 181         cm_return_val_if_fail(mimeinfo->privacy != NULL, -1);
 182         data = (PrivacyDataPGP *) mimeinfo->privacy;
 183         if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
 184                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 185                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 186                 return 0;
 187         }
 188
 189
 190         debug_print("Checking PGP/MIME signature\n");
 191
 192         err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_OpenPGP);
 193
 194         if (err) {
 195                 debug_print ("gpgme_set_protocol failed: %s\n",
 196                    gpgme_strerror (err));
 197         }
 198         parent = procmime_mimeinfo_parent(mimeinfo);
 199
 200         fp = claws_fopen(parent->data.filename, "rb");
 201         cm_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
 202
 203         boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
 204         if (!boundary) {
 205                 privacy_set_error(_("Signature boundary not found."));
 206                 claws_fclose(fp);
 207                 return 0;
 208         }
 209         textstr = get_canonical_content(fp, boundary);
 210
 211         err = gpgme_data_new_from_mem(&textdata, textstr, (size_t)strlen(textstr), 0);
 212         if (err) {
 213                 debug_print ("gpgme_data_new_from_mem failed: %s\n",
 214                    gpgme_strerror (err));
 215         }
 216         signature = (MimeInfo *) mimeinfo->node->next->data;
 217         sigdata = sgpgme_data_from_mimeinfo(signature);
 218
 219         err = 0;
 220         if (signature->encoding_type == ENC_BASE64) {
 221                 err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
 222         }
 223
 224         if (err) {
 225                 debug_print ("gpgme_data_set_encoding failed: %s\n",
 226                         gpgme_strerror (err));
 227         }
 228
 229         data->sigstatus =
 230                 sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
 231
 232         gpgme_data_release(sigdata);
 233         gpgme_data_release(textdata);
 234         g_free(textstr);
 235         claws_fclose(fp);
 236
 237         return 0;
 238 }
 239
 240 static SignatureStatus pgpmime_get_sig_status(MimeInfo *mimeinfo)
 241 {
 242         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 243
 244         cm_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
 245
 246         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
 247 }
 248
 249 static gchar *pgpmime_get_sig_info_short(MimeInfo *mimeinfo)
 250 {
 251         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 252
 253         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 254
 255         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 256 }
 257
 258 static gchar *pgpmime_get_sig_info_full(MimeInfo *mimeinfo)
 259 {
 260         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 261
 262         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 263
 264         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
 265 }
 266
 267 static gboolean pgpmime_is_encrypted(MimeInfo *mimeinfo)
 268 {
 269         MimeInfo *tmpinfo;
 270         const gchar *tmpstr;
 271         const gchar *begin_indicator = "-----BEGIN PGP MESSAGE-----";
 272         const gchar *end_indicator = "-----END PGP MESSAGE-----";
 273         gchar *textdata;
 274
 275         if (mimeinfo->type != MIMETYPE_MULTIPART)
 276                 return FALSE;
 277         if (g_ascii_strcasecmp(mimeinfo->subtype, "encrypted"))
 278                 return FALSE;
 279         tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "protocol");
 280         if ((tmpstr == NULL) || g_ascii_strcasecmp(tmpstr, "application/pgp-encrypted"))
 281                 return FALSE;
 282         if (g_node_n_children(mimeinfo->node) != 2)
 283                 return FALSE;
 284
 285         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 0)->data;
 286         if (tmpinfo->type != MIMETYPE_APPLICATION)
 287                 return FALSE;
 288         if (g_ascii_strcasecmp(tmpinfo->subtype, "pgp-encrypted"))
 289                 return FALSE;
 290
 291         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 292         if (tmpinfo->type != MIMETYPE_APPLICATION)
 293                 return FALSE;
 294         if (g_ascii_strcasecmp(tmpinfo->subtype, "octet-stream"))
 295                 return FALSE;
 296
 297         textdata = procmime_get_part_as_string(tmpinfo, TRUE);
 298         if (!textdata)
 299                 return FALSE;
 300
 301         if (!pgp_locate_armor_header(textdata, begin_indicator)) {
 302                 g_free(textdata);
 303                 return FALSE;
 304         }
 305         if (!pgp_locate_armor_header(textdata, end_indicator)) {
 306                 g_free(textdata);
 307                 return FALSE;
 308         }
 309
 310         g_free(textdata);
 311
 312         return TRUE;
 313 }
 314
 315 static MimeInfo *pgpmime_decrypt(MimeInfo *mimeinfo)
 316 {
 317         MimeInfo *encinfo, *decinfo, *parseinfo;
 318         gpgme_data_t cipher = NULL, plain = NULL;
 319         static gint id = 0;
 320         FILE *dstfp;
 321         gchar *fname;
 322         gpgme_verify_result_t sigstat = NULL;
 323         PrivacyDataPGP *data = NULL;
 324         gpgme_ctx_t ctx;
 325         gchar *chars;
 326         size_t len;
 327         gpgme_error_t err;
 328
 329         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 330                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 331                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 332                 return NULL;
 333         }
 334
 335         cm_return_val_if_fail(pgpmime_is_encrypted(mimeinfo), NULL);
 336
 337         encinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 338
 339         cipher = sgpgme_data_from_mimeinfo(encinfo);
 340         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 341
 342         gpgme_data_release(cipher);
 343         if (plain == NULL) {
 344                 debug_print("plain is null!\n");
 345                 gpgme_release(ctx);
 346                 return NULL;
 347         }
 348
 349         fname = g_strdup_printf("%s%cplaintext.%08x",
 350                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 351
 352         if ((dstfp = claws_fopen(fname, "wb")) == NULL) {
 353                 FILE_OP_ERROR(fname, "claws_fopen");
 354                 privacy_set_error(_("Couldn't open decrypted file %s"), fname);
 355                 g_free(fname);
 356                 gpgme_data_release(plain);
 357                 gpgme_release(ctx);
 358                 debug_print("can't open!\n");
 359                 return NULL;
 360         }
 361
 362         if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
 363                 FILE_OP_ERROR(fname, "fprintf");
 364                 claws_fclose(dstfp);
 365                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 366                 g_free(fname);
 367                 gpgme_data_release(plain);
 368                 gpgme_release(ctx);
 369                 debug_print("can't open!\n");
 370                 return NULL;
 371         }
 372
 373         chars = sgpgme_data_release_and_get_mem(plain, &len);
 374         if (len > 0) {
 375                 if (claws_fwrite(chars, 1, len, dstfp) < len) {
 376                         FILE_OP_ERROR(fname, "claws_fwrite");
 377                         g_free(chars);
 378                         claws_fclose(dstfp);
 379                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 380                         g_free(fname);
 381                         gpgme_data_release(plain);
 382                         gpgme_release(ctx);
 383                         debug_print("can't open!\n");
 384                         return NULL;
 385                 }
 386         }
 387         g_free(chars);
 388
 389         if (claws_safe_fclose(dstfp) == EOF) {
 390                 FILE_OP_ERROR(fname, "claws_fclose");
 391                 privacy_set_error(_("Couldn't close decrypted file %s"), fname);
 392                 g_free(fname);
 393                 gpgme_data_release(plain);
 394                 gpgme_release(ctx);
 395                 debug_print("can't open!\n");
 396                 return NULL;
 397         }
 398
 399         parseinfo = procmime_scan_file(fname);
 400         g_free(fname);
 401         if (parseinfo == NULL) {
 402                 gpgme_release(ctx);
 403                 privacy_set_error(_("Couldn't parse decrypted file."));
 404                 return NULL;
 405         }
 406         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 407                 g_node_first_child(parseinfo->node)->data : NULL;
 408         if (decinfo == NULL) {
 409                 privacy_set_error(_("Couldn't parse decrypted file parts."));
 410                 gpgme_release(ctx);
 411                 return NULL;
 412         }
 413
 414         g_node_unlink(decinfo->node);
 415         procmime_mimeinfo_free_all(&parseinfo);
 416
 417         decinfo->tmp = TRUE;
 418
 419         if (sigstat != NULL && sigstat->signatures != NULL) {
 420                 if (decinfo->privacy != NULL) {
 421                         data = (PrivacyDataPGP *) decinfo->privacy;
 422                 } else {
 423                         data = pgpmime_new_privacydata();
 424                         decinfo->privacy = (PrivacyData *) data;
 425                 }
 426                 if (data != NULL) {
 427                         data->done_sigtest = TRUE;
 428                         data->is_signed = TRUE;
 429                         data->sigstatus = sigstat;
 430                         if (data->ctx)
 431                                 gpgme_release(data->ctx);
 432                         data->ctx = ctx;
 433                 }
 434         } else
 435                 gpgme_release(ctx);
 436
 437         return decinfo;
 438 }
 439
 440 gboolean pgpmime_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 441 {
 442         MimeInfo *msgcontent, *sigmultipart, *newinfo;
 443         gchar *textstr, *micalg = NULL;
 444         FILE *fp;
 445         gchar *boundary = NULL;
 446         gchar *sigcontent;
 447         gpgme_ctx_t ctx;
 448         gpgme_data_t gpgtext, gpgsig;
 449         gpgme_error_t err;
 450         size_t len;
 451         struct passphrase_cb_info_s info;
 452         gpgme_sign_result_t result = NULL;
 453         gchar *test_msg;
 454
 455         fp = my_tmpfile();
 456         if (fp == NULL) {
 457                 perror("my_tmpfile");
 458                 privacy_set_error(_("Couldn't create temporary file: %s"), g_strerror(errno));
 459                 return FALSE;
 460         }
 461         procmime_write_mimeinfo(mimeinfo, fp);
 462         rewind(fp);
 463
 464         /* read temporary file into memory */
 465         test_msg = file_read_stream_to_str(fp);
 466         claws_fclose(fp);
 467
 468         memset (&info, 0, sizeof info);
 469
 470         /* remove content node from message */
 471         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 472         g_node_unlink(msgcontent->node);
 473
 474         /* create temporary multipart for content */
 475         sigmultipart = procmime_mimeinfo_new();
 476         sigmultipart->type = MIMETYPE_MULTIPART;
 477         sigmultipart->subtype = g_strdup("signed");
 478
 479         do {
 480                 g_free(boundary);
 481                 boundary = generate_mime_boundary("Sig");
 482         } while (strstr(test_msg, boundary) != NULL);
 483
 484         g_free(test_msg);
 485
 486         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
 487                             g_strdup(boundary));
 488         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
 489                             g_strdup("application/pgp-signature"));
 490         g_node_append(sigmultipart->node, msgcontent->node);
 491         g_node_append(mimeinfo->node, sigmultipart->node);
 492
 493         /* write message content to temporary file */
 494         fp = my_tmpfile();
 495         if (fp == NULL) {
 496                 perror("my_tmpfile");
 497                 privacy_set_error(_("Couldn't create temporary file: %s"), g_strerror(errno));
 498                 g_free(boundary);
 499                 return FALSE;
 500         }
 501         procmime_write_mimeinfo(sigmultipart, fp);
 502         rewind(fp);
 503
 504         /* read temporary file into memory */
 505         textstr = get_canonical_content(fp, boundary);
 506
 507         g_free(boundary);
 508         claws_fclose(fp);
 509
 510         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 511         gpgme_data_new(&gpgsig);
 512         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 513                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 514                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 515                 return FALSE;
 516         }
 517         gpgme_set_textmode(ctx, 1);
 518         gpgme_set_armor(ctx, 1);
 519         gpgme_signers_clear (ctx);
 520
 521         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 522                 gpgme_release(ctx);
 523                 return FALSE;
 524         }
 525
 526         prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
 527         if (g_getenv("GPG_AGENT_INFO") && prefs_gpg_get_config()->use_gpg_agent) {
 528                 debug_print("GPG_AGENT_INFO environment defined, running without passphrase callback\n");
 529         } else {
 530                 info.c = ctx;
 531                 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 532         }
 533
 534         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
 535         if (err != GPG_ERR_NO_ERROR) {
 536                 if (err == GPG_ERR_CANCELED) {
 537                         /* ignore cancelled signing */
 538                         privacy_reset_error();
 539                         debug_print("gpgme_op_sign cancelled\n");
 540                 } else {
 541                         privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
 542                         debug_print("gpgme_op_sign error : %x\n", err);
 543                 }
 544                 gpgme_release(ctx);
 545                 return FALSE;
 546         }
 547         result = gpgme_op_sign_result(ctx);
 548         if (result && result->signatures) {
 549                 gpgme_new_signature_t sig = result->signatures;
 550                 if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 551                         gchar *down_algo = g_ascii_strdown(gpgme_hash_algo_name(
 552                                 result->signatures->hash_algo), -1);
 553                         micalg = g_strdup_printf("pgp-%s", down_algo);
 554                         g_free(down_algo);
 555                 } else {
 556                         micalg = g_strdup(gpgme_hash_algo_name(
 557                                 result->signatures->hash_algo));
 558                 }
 559                 while (sig) {
 560                         debug_print("valid signature: %s\n", sig->fpr);
 561                         sig = sig->next;
 562                 }
 563         } else if (result && result->invalid_signers) {
 564                 gpgme_invalid_key_t invalid = result->invalid_signers;
 565                 while (invalid) {
 566                         g_warning("invalid signer: %s (%s)", invalid->fpr,
 567                                 gpgme_strerror(invalid->reason));
 568                         privacy_set_error(_("Data signing failed due to invalid signer: %s"),
 569                                 gpgme_strerror(invalid->reason));
 570                         invalid = invalid->next;
 571                 }
 572                 gpgme_release(ctx);
 573                 return FALSE;
 574         } else {
 575                 /* can't get result (maybe no signing key?) */
 576                 debug_print("gpgme_op_sign_result error\n");
 577                 privacy_set_error(_("Data signing failed, no results."));
 578                 gpgme_release(ctx);
 579                 return FALSE;
 580         }
 581
 582         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 583         gpgme_data_release(gpgtext);
 584         g_free(textstr);
 585
 586         if (sigcontent == NULL || len <= 0) {
 587                 g_warning("sgpgme_data_release_and_get_mem failed");
 588                 privacy_set_error(_("Data signing failed, no contents."));
 589                 g_free(micalg);
 590                 g_free(sigcontent);
 591                 return FALSE;
 592         }
 593
 594         /* add signature */
 595         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
 596                             micalg);
 597
 598         newinfo = procmime_mimeinfo_new();
 599         newinfo->type = MIMETYPE_APPLICATION;
 600         newinfo->subtype = g_strdup("pgp-signature");
 601         newinfo->description = g_strdup(_("OpenPGP digital signature"));
 602         newinfo->content = MIMECONTENT_MEM;
 603         newinfo->data.mem = g_malloc(len + 1);
 604         memmove(newinfo->data.mem, sigcontent, len);
 605         newinfo->data.mem[len] = '\0';
 606         newinfo->tmp = TRUE;
 607         g_node_append(sigmultipart->node, newinfo->node);
 608
 609         g_free(sigcontent);
 610         gpgme_release(ctx);
 611
 612         return TRUE;
 613 }
 614 gchar *pgpmime_get_encrypt_data(GSList *recp_names)
 615 {
 616         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
 617 }
 618
 619 static const gchar *pgpmime_get_encrypt_warning(void)
 620 {
 621         if (prefs_gpg_should_skip_encryption_warning(pgpmime_system.id))
 622                 return NULL;
 623         else
 624                 return _("Please note that email headers, like Subject, "
 625                          "are not encrypted by the PGP/Mime system.");
 626 }
 627
 628 static void pgpmime_inhibit_encrypt_warning(gboolean inhibit)
 629 {
 630         if (inhibit)
 631                 prefs_gpg_add_skip_encryption_warning(pgpmime_system.id);
 632         else
 633                 prefs_gpg_remove_skip_encryption_warning(pgpmime_system.id);
 634 }
 635
 636 gboolean pgpmime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 637 {
 638         MimeInfo *msgcontent, *encmultipart, *newinfo;
 639         FILE *fp;
 640         gchar *boundary, *enccontent;
 641         size_t len;
 642         gchar *textstr;
 643         gpgme_data_t gpgtext = NULL, gpgenc = NULL;
 644         gpgme_ctx_t ctx = NULL;
 645         gpgme_key_t *kset = NULL;
 646         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 647         gint i = 0;
 648         gpgme_error_t err;
 649
 650         while (fprs[i] && strlen(fprs[i])) {
 651                 i++;
 652         }
 653
 654         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 655         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 656         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 657                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 658                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 659                 g_free(kset);
 660                 g_free(fprs);
 661                 return FALSE;
 662         }
 663         i = 0;
 664         while (fprs[i] && strlen(fprs[i])) {
 665                 gpgme_key_t key;
 666                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 667                 if (err) {
 668                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 669                         privacy_set_error(_("Couldn't add GPG key %s, %s"), fprs[i], gpgme_strerror(err));
 670                         g_free(kset);
 671                         g_free(fprs);
 672                         return FALSE;
 673                 }
 674                 debug_print("found %s at %d\n", fprs[i], i);
 675                 kset[i] = key;
 676                 i++;
 677         }
 678
 679         debug_print("Encrypting message content\n");
 680
 681         /* remove content node from message */
 682         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 683         g_node_unlink(msgcontent->node);
 684
 685         /* create temporary multipart for content */
 686         encmultipart = procmime_mimeinfo_new();
 687         encmultipart->type = MIMETYPE_MULTIPART;
 688         encmultipart->subtype = g_strdup("encrypted");
 689         boundary = generate_mime_boundary("Encrypt");
 690         g_hash_table_insert(encmultipart->typeparameters, g_strdup("boundary"),
 691                             g_strdup(boundary));
 692         g_hash_table_insert(encmultipart->typeparameters, g_strdup("protocol"),
 693                             g_strdup("application/pgp-encrypted"));
 694         g_node_append(encmultipart->node, msgcontent->node);
 695
 696         /* write message content to temporary file */
 697         fp = my_tmpfile();
 698         if (fp == NULL) {
 699                 perror("my_tmpfile");
 700                 privacy_set_error(_("Couldn't create temporary file, %s"), g_strerror(errno));
 701                 g_free(kset);
 702                 g_free(boundary);
 703                 g_free(fprs);
 704                 return FALSE;
 705         }
 706         procmime_write_mimeinfo(encmultipart, fp);
 707         rewind(fp);
 708
 709         /* read temporary file into memory */
 710         textstr = get_canonical_content(fp, boundary);
 711
 712         g_free(boundary);
 713         claws_fclose(fp);
 714
 715         /* encrypt data */
 716         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 717         gpgme_data_new(&gpgenc);
 718         gpgme_set_armor(ctx, 1);
 719         cm_gpgme_data_rewind(gpgtext);
 720
 721         err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 722
 723         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 724         gpgme_data_release(gpgtext);
 725         g_free(textstr);
 726         g_free(kset);
 727
 728         if (enccontent == NULL || len <= 0) {
 729                 g_warning("sgpgme_data_release_and_get_mem failed");
 730                 privacy_set_error(_("Encryption failed, %s"), gpgme_strerror(err));
 731                 gpgme_release(ctx);
 732                 g_free(enccontent);
 733                 g_free(fprs);
 734                 return FALSE;
 735         }
 736
 737         /* create encrypted multipart */
 738         g_node_unlink(msgcontent->node);
 739         procmime_mimeinfo_free_all(&msgcontent);
 740         g_node_append(mimeinfo->node, encmultipart->node);
 741
 742         newinfo = procmime_mimeinfo_new();
 743         newinfo->type = MIMETYPE_APPLICATION;
 744         newinfo->subtype = g_strdup("pgp-encrypted");
 745         newinfo->content = MIMECONTENT_MEM;
 746         newinfo->data.mem = g_strdup("Version: 1\n");
 747         newinfo->tmp = TRUE;
 748         g_node_append(encmultipart->node, newinfo->node);
 749
 750         newinfo = procmime_mimeinfo_new();
 751         newinfo->type = MIMETYPE_APPLICATION;
 752         newinfo->subtype = g_strdup("octet-stream");
 753         newinfo->content = MIMECONTENT_MEM;
 754         newinfo->data.mem = g_malloc(len + 1);
 755         newinfo->tmp = TRUE;
 756         memmove(newinfo->data.mem, enccontent, len);
 757         newinfo->data.mem[len] = '\0';
 758         g_node_append(encmultipart->node, newinfo->node);
 759
 760         g_free(enccontent);
 761         gpgme_release(ctx);
 762
 763         g_free(fprs);
 764
 765         return TRUE;
 766 }
 767
 768 static PrivacySystem pgpmime_system = {
 769         "pgpmime",                      /* id */
 770         "PGP MIME",                     /* name */
 771
 772         pgpmime_free_privacydata,       /* free_privacydata */
 773
 774         pgpmime_is_signed,              /* is_signed(MimeInfo *) */
 775         pgpmime_check_signature,        /* check_signature(MimeInfo *) */
 776         pgpmime_get_sig_status,         /* get_sig_status(MimeInfo *) */
 777         pgpmime_get_sig_info_short,     /* get_sig_info_short(MimeInfo *) */
 778         pgpmime_get_sig_info_full,      /* get_sig_info_full(MimeInfo *) */
 779
 780         pgpmime_is_encrypted,           /* is_encrypted(MimeInfo *) */
 781         pgpmime_decrypt,                /* decrypt(MimeInfo *) */
 782
 783         TRUE,
 784         pgpmime_sign,
 785
 786         TRUE,
 787         pgpmime_get_encrypt_data,
 788         pgpmime_encrypt,
 789         pgpmime_get_encrypt_warning,
 790         pgpmime_inhibit_encrypt_warning,
 791         prefs_gpg_auto_check_signatures,
 792 };
 793
 794 void pgpmime_init()
 795 {
 796         privacy_register_system(&pgpmime_system);
 797 }
 798
 799 void pgpmime_done()
 800 {
 801         privacy_unregister_system(&pgpmime_system);
 802 }
 803
 804 struct PluginFeature *plugin_provides(void)
 805 {
 806         static struct PluginFeature features[] =
 807                 { {PLUGIN_PRIVACY, N_("PGP/Mime")},
 808                   {PLUGIN_NOTHING, NULL}};
 809         return features;
 810 }
 811 #endif /* USE_GPGME */