src/plugins/pgpmime/pgpmime.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2012 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
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #include "claws-features.h"
  23 #endif
  24
  25 #ifdef USE_GPGME
  26
  27 #include "defs.h"
  28 #include <glib.h>
  29 #include <glib/gi18n.h>
  30 #include <gpgme.h>
  31 #include <ctype.h>
  32 #include <errno.h>
  33
  34 #include "utils.h"
  35 #include "privacy.h"
  36 #include "procmime.h"
  37 #include "plugin.h"
  38
  39 #include "pgpmime.h"
  40 #include <plugins/pgpcore/sgpgme.h>
  41 #include <plugins/pgpcore/prefs_gpg.h>
  42 #include <plugins/pgpcore/passphrase.h>
  43 #include <plugins/pgpcore/pgp_utils.h>
  44
  45 #include "prefs_common.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                 return NULL;
  76         }
  77
  78         return data;
  79 }
  80
  81 static void pgpmime_free_privacydata(PrivacyData *_data)
  82 {
  83         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
  84         gpgme_release(data->ctx);
  85         g_free(data);
  86 }
  87
  88 static gboolean pgpmime_is_signed(MimeInfo *mimeinfo)
  89 {
  90         MimeInfo *parent;
  91         MimeInfo *signature;
  92         const gchar *protocol;
  93         PrivacyDataPGP *data = NULL;
  94
  95         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
  96         if (mimeinfo->privacy != NULL) {
  97                 data = (PrivacyDataPGP *) mimeinfo->privacy;
  98                 if (data->done_sigtest)
  99                         return data->is_signed;
 100         }
 101
 102         /* check parent */
 103         parent = procmime_mimeinfo_parent(mimeinfo);
 104         if (parent == NULL)
 105                 return FALSE;
 106         if ((parent->type != MIMETYPE_MULTIPART) ||
 107             g_ascii_strcasecmp(parent->subtype, "signed"))
 108                 return FALSE;
 109         protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
 110         if ((protocol == NULL) ||
 111             (g_ascii_strcasecmp(protocol, "application/pgp-signature")))
 112                 return FALSE;
 113
 114         /* check if mimeinfo is the first child */
 115         if (parent->node->children->data != mimeinfo)
 116                 return FALSE;
 117
 118         /* check signature */
 119         signature = parent->node->children->next != NULL ?
 120             (MimeInfo *) parent->node->children->next->data : NULL;
 121         if (signature == NULL)
 122                 return FALSE;
 123         if ((signature->type != MIMETYPE_APPLICATION) ||
 124             (g_ascii_strcasecmp(signature->subtype, "pgp-signature")))
 125                 return FALSE;
 126
 127         if (data == NULL) {
 128                 data = pgpmime_new_privacydata();
 129                 mimeinfo->privacy = (PrivacyData *) data;
 130         }
 131
 132         data->done_sigtest = TRUE;
 133         data->is_signed = TRUE;
 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"), 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         if (data->sigstatus == NULL &&
 245             prefs_gpg_get_config()->auto_check_signatures)
 246                 pgpmime_check_signature(mimeinfo);
 247
 248         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
 249 }
 250
 251 static gchar *pgpmime_get_sig_info_short(MimeInfo *mimeinfo)
 252 {
 253         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 254
 255         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 256
 257         if (data->sigstatus == NULL &&
 258             prefs_gpg_get_config()->auto_check_signatures)
 259                 pgpmime_check_signature(mimeinfo);
 260
 261         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 262 }
 263
 264 static gchar *pgpmime_get_sig_info_full(MimeInfo *mimeinfo)
 265 {
 266         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 267
 268         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 269
 270         if (data->sigstatus == NULL &&
 271             prefs_gpg_get_config()->auto_check_signatures)
 272                 pgpmime_check_signature(mimeinfo);
 273
 274         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
 275 }
 276
 277 static gboolean pgpmime_is_encrypted(MimeInfo *mimeinfo)
 278 {
 279         MimeInfo *tmpinfo;
 280         const gchar *tmpstr;
 281         const gchar *begin_indicator = "-----BEGIN PGP MESSAGE-----";
 282         const gchar *end_indicator = "-----END PGP MESSAGE-----";
 283         gchar *textdata;
 284
 285         if (mimeinfo->type != MIMETYPE_MULTIPART)
 286                 return FALSE;
 287         if (g_ascii_strcasecmp(mimeinfo->subtype, "encrypted"))
 288                 return FALSE;
 289         tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "protocol");
 290         if ((tmpstr == NULL) || g_ascii_strcasecmp(tmpstr, "application/pgp-encrypted"))
 291                 return FALSE;
 292         if (g_node_n_children(mimeinfo->node) != 2)
 293                 return FALSE;
 294
 295         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 0)->data;
 296         if (tmpinfo->type != MIMETYPE_APPLICATION)
 297                 return FALSE;
 298         if (g_ascii_strcasecmp(tmpinfo->subtype, "pgp-encrypted"))
 299                 return FALSE;
 300
 301         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 302         if (tmpinfo->type != MIMETYPE_APPLICATION)
 303                 return FALSE;
 304         if (g_ascii_strcasecmp(tmpinfo->subtype, "octet-stream"))
 305                 return FALSE;
 306
 307         textdata = get_part_as_string(tmpinfo);
 308         if (!textdata)
 309                 return FALSE;
 310
 311         if (!pgp_locate_armor_header(textdata, begin_indicator)) {
 312                 g_free(textdata);
 313                 return FALSE;
 314         }
 315         if (!pgp_locate_armor_header(textdata, end_indicator)) {
 316                 g_free(textdata);
 317                 return FALSE;
 318         }
 319
 320         g_free(textdata);
 321
 322         return TRUE;
 323 }
 324
 325 static MimeInfo *pgpmime_decrypt(MimeInfo *mimeinfo)
 326 {
 327         MimeInfo *encinfo, *decinfo, *parseinfo;
 328         gpgme_data_t cipher = NULL, plain = NULL;
 329         static gint id = 0;
 330         FILE *dstfp;
 331         gchar *fname;
 332         gpgme_verify_result_t sigstat = NULL;
 333         PrivacyDataPGP *data = NULL;
 334         gpgme_ctx_t ctx;
 335         gchar *chars;
 336         size_t len;
 337         gpgme_error_t err;
 338
 339         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 340                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 341                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 342                 return NULL;
 343         }
 344
 345         cm_return_val_if_fail(pgpmime_is_encrypted(mimeinfo), NULL);
 346
 347         encinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 348
 349         cipher = sgpgme_data_from_mimeinfo(encinfo);
 350         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 351
 352         gpgme_data_release(cipher);
 353         if (plain == NULL) {
 354                 debug_print("plain is null!\n");
 355                 gpgme_release(ctx);
 356                 return NULL;
 357         }
 358
 359         fname = g_strdup_printf("%s%cplaintext.%08x",
 360                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 361
 362         if ((dstfp = g_fopen(fname, "wb")) == NULL) {
 363                 FILE_OP_ERROR(fname, "fopen");
 364                 privacy_set_error(_("Couldn't open decrypted file %s"), fname);
 365                 g_free(fname);
 366                 gpgme_data_release(plain);
 367                 gpgme_release(ctx);
 368                 debug_print("can't open!\n");
 369                 return NULL;
 370         }
 371
 372         if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
 373                 FILE_OP_ERROR(fname, "fprintf");
 374                 fclose(dstfp);
 375                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 376                 g_free(fname);
 377                 gpgme_data_release(plain);
 378                 gpgme_release(ctx);
 379                 debug_print("can't open!\n");
 380                 return NULL;
 381         }
 382
 383         chars = sgpgme_data_release_and_get_mem(plain, &len);
 384         if (len > 0) {
 385                 if (fwrite(chars, 1, len, dstfp) < len) {
 386                         FILE_OP_ERROR(fname, "fwrite");
 387                         g_free(chars);
 388                         fclose(dstfp);
 389                         privacy_set_error(_("Couldn't write to 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         g_free(chars);
 398
 399         if (fclose(dstfp) == EOF) {
 400                 FILE_OP_ERROR(fname, "fclose");
 401                 privacy_set_error(_("Couldn't close decrypted file %s"), fname);
 402                 g_free(fname);
 403                 gpgme_data_release(plain);
 404                 gpgme_release(ctx);
 405                 debug_print("can't open!\n");
 406                 return NULL;
 407         }
 408
 409         parseinfo = procmime_scan_file(fname);
 410         g_free(fname);
 411         if (parseinfo == NULL) {
 412                 gpgme_release(ctx);
 413                 privacy_set_error(_("Couldn't parse decrypted file."));
 414                 return NULL;
 415         }
 416         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 417                 g_node_first_child(parseinfo->node)->data : NULL;
 418         if (decinfo == NULL) {
 419                 privacy_set_error(_("Couldn't parse decrypted file parts."));
 420                 gpgme_release(ctx);
 421                 return NULL;
 422         }
 423
 424         g_node_unlink(decinfo->node);
 425         procmime_mimeinfo_free_all(parseinfo);
 426
 427         decinfo->tmp = TRUE;
 428
 429         if (sigstat != NULL && sigstat->signatures != NULL) {
 430                 if (decinfo->privacy != NULL) {
 431                         data = (PrivacyDataPGP *) decinfo->privacy;
 432                 } else {
 433                         data = pgpmime_new_privacydata();
 434                         decinfo->privacy = (PrivacyData *) data;
 435                 }
 436                 data->done_sigtest = TRUE;
 437                 data->is_signed = TRUE;
 438                 data->sigstatus = sigstat;
 439                 if (data->ctx)
 440                         gpgme_release(data->ctx);
 441                 data->ctx = ctx;
 442         } else
 443                 gpgme_release(ctx);
 444
 445         return decinfo;
 446 }
 447
 448 gboolean pgpmime_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 449 {
 450         MimeInfo *msgcontent, *sigmultipart, *newinfo;
 451         gchar *textstr, *micalg = NULL;
 452         FILE *fp;
 453         gchar *boundary = NULL;
 454         gchar *sigcontent;
 455         gpgme_ctx_t ctx;
 456         gpgme_data_t gpgtext, gpgsig;
 457         gpgme_error_t err;
 458         size_t len;
 459         struct passphrase_cb_info_s info;
 460         gpgme_sign_result_t result = NULL;
 461         gchar *test_msg;
 462
 463         fp = my_tmpfile();
 464         if (fp == NULL) {
 465                 privacy_set_error(_("Couldn't create temporary file: %s"), strerror(errno));
 466                 return FALSE;
 467         }
 468         procmime_write_mimeinfo(mimeinfo, fp);
 469         rewind(fp);
 470
 471         /* read temporary file into memory */
 472         test_msg = file_read_stream_to_str(fp);
 473         fclose(fp);
 474
 475         memset (&info, 0, sizeof info);
 476
 477         /* remove content node from message */
 478         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 479         g_node_unlink(msgcontent->node);
 480
 481         /* create temporary multipart for content */
 482         sigmultipart = procmime_mimeinfo_new();
 483         sigmultipart->type = MIMETYPE_MULTIPART;
 484         sigmultipart->subtype = g_strdup("signed");
 485
 486         do {
 487                 g_free(boundary);
 488                 boundary = generate_mime_boundary("Sig");
 489         } while (strstr(test_msg, boundary) != NULL);
 490
 491         g_free(test_msg);
 492
 493         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
 494                             g_strdup(boundary));
 495         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
 496                             g_strdup("application/pgp-signature"));
 497         g_node_append(sigmultipart->node, msgcontent->node);
 498         g_node_append(mimeinfo->node, sigmultipart->node);
 499
 500         /* write message content to temporary file */
 501         fp = my_tmpfile();
 502         if (fp == NULL) {
 503                 perror("my_tmpfile");
 504                 privacy_set_error(_("Couldn't create temporary file: %s"), strerror(errno));
 505                 return FALSE;
 506         }
 507         procmime_write_mimeinfo(sigmultipart, fp);
 508         rewind(fp);
 509
 510         /* read temporary file into memory */
 511         textstr = get_canonical_content(fp, boundary);
 512
 513         fclose(fp);
 514
 515         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 516         gpgme_data_new(&gpgsig);
 517         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 518                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 519                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 520                 return FALSE;
 521         }
 522         gpgme_set_textmode(ctx, 1);
 523         gpgme_set_armor(ctx, 1);
 524         gpgme_signers_clear (ctx);
 525
 526         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 527                 gpgme_release(ctx);
 528                 return FALSE;
 529         }
 530
 531         prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
 532         if (getenv("GPG_AGENT_INFO") && prefs_gpg_get_config()->use_gpg_agent) {
 533                 debug_print("GPG_AGENT_INFO environment defined, running without passphrase callback\n");
 534         } else {
 535                 info.c = ctx;
 536                 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 537         }
 538
 539         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
 540         if (err != GPG_ERR_NO_ERROR) {
 541                 if (err == GPG_ERR_CANCELED) {
 542                         /* ignore cancelled signing */
 543                         privacy_reset_error();
 544                         debug_print("gpgme_op_sign cancelled\n");
 545                 } else {
 546                         privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
 547                         debug_print("gpgme_op_sign error : %x\n", err);
 548                 }
 549                 gpgme_release(ctx);
 550                 return FALSE;
 551         }
 552         result = gpgme_op_sign_result(ctx);
 553         if (result && result->signatures) {
 554                 gpgme_new_signature_t sig = result->signatures;
 555                 if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 556                         micalg = g_strdup_printf("pgp-%s", g_ascii_strdown(gpgme_hash_algo_name(
 557                                 result->signatures->hash_algo),-1));
 558                 } else {
 559                         micalg = g_strdup(gpgme_hash_algo_name(
 560                                 result->signatures->hash_algo));
 561                 }
 562                 while (sig) {
 563                         debug_print("valid signature: %s\n", sig->fpr);
 564                         sig = sig->next;
 565                 }
 566         } else if (result && result->invalid_signers) {
 567                 gpgme_invalid_key_t invalid = result->invalid_signers;
 568                 while (invalid) {
 569                         g_warning("invalid signer: %s (%s)", invalid->fpr,
 570                                 gpgme_strerror(invalid->reason));
 571                         privacy_set_error(_("Data signing failed due to invalid signer: %s"),
 572                                 gpgme_strerror(invalid->reason));
 573                         invalid = invalid->next;
 574                 }
 575                 gpgme_release(ctx);
 576                 return FALSE;
 577         } else {
 578                 /* can't get result (maybe no signing key?) */
 579                 debug_print("gpgme_op_sign_result error\n");
 580                 privacy_set_error(_("Data signing failed, no results."));
 581                 gpgme_release(ctx);
 582                 return FALSE;
 583         }
 584
 585         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 586         gpgme_data_release(gpgtext);
 587         g_free(textstr);
 588
 589         if (sigcontent == NULL || len <= 0) {
 590                 g_warning("sgpgme_data_release_and_get_mem failed");
 591                 privacy_set_error(_("Data signing failed, no contents."));
 592                 g_free(micalg);
 593                 return FALSE;
 594         }
 595
 596         /* add signature */
 597         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
 598                             micalg);
 599
 600         newinfo = procmime_mimeinfo_new();
 601         newinfo->type = MIMETYPE_APPLICATION;
 602         newinfo->subtype = g_strdup("pgp-signature");
 603         g_hash_table_insert(newinfo->typeparameters, g_strdup("name"),
 604                              g_strdup("signature.asc"));
 605         newinfo->content = MIMECONTENT_MEM;
 606         newinfo->disposition = DISPOSITIONTYPE_ATTACHMENT;
 607         g_hash_table_insert(newinfo->dispositionparameters, g_strdup("filename"),
 608                             g_strdup("signature.asc"));
 609         newinfo->data.mem = g_malloc(len + 1);
 610         g_memmove(newinfo->data.mem, sigcontent, len);
 611         newinfo->data.mem[len] = '\0';
 612         g_node_append(sigmultipart->node, newinfo->node);
 613
 614         g_free(sigcontent);
 615         gpgme_release(ctx);
 616
 617         return TRUE;
 618 }
 619 gchar *pgpmime_get_encrypt_data(GSList *recp_names)
 620 {
 621         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
 622 }
 623
 624 static const gchar *pgpmime_get_encrypt_warning(void)
 625 {
 626         if (prefs_gpg_should_skip_encryption_warning(pgpmime_system.id))
 627                 return NULL;
 628         else
 629                 return _("Please note that email headers, like Subject, "
 630                          "are not encrypted by the PGP/Mime system.");
 631 }
 632
 633 static void pgpmime_inhibit_encrypt_warning(gboolean inhibit)
 634 {
 635         if (inhibit)
 636                 prefs_gpg_add_skip_encryption_warning(pgpmime_system.id);
 637         else
 638                 prefs_gpg_remove_skip_encryption_warning(pgpmime_system.id);
 639 }
 640
 641 gboolean pgpmime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 642 {
 643         MimeInfo *msgcontent, *encmultipart, *newinfo;
 644         FILE *fp;
 645         gchar *boundary, *enccontent;
 646         size_t len;
 647         gchar *textstr;
 648         gpgme_data_t gpgtext = NULL, gpgenc = NULL;
 649         gpgme_ctx_t ctx = NULL;
 650         gpgme_key_t *kset = NULL;
 651         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 652         gint i = 0;
 653         gpgme_error_t err;
 654
 655         while (fprs[i] && strlen(fprs[i])) {
 656                 i++;
 657         }
 658
 659         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 660         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 661         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 662                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 663                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 664                 g_free(kset);
 665                 return FALSE;
 666         }
 667         i = 0;
 668         while (fprs[i] && strlen(fprs[i])) {
 669                 gpgme_key_t key;
 670                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 671                 if (err) {
 672                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 673                         privacy_set_error(_("Couldn't add GPG key %s, %s"), fprs[i], gpgme_strerror(err));
 674                         g_free(kset);
 675                         return FALSE;
 676                 }
 677                 debug_print("found %s at %d\n", fprs[i], i);
 678                 kset[i] = key;
 679                 i++;
 680         }
 681
 682         debug_print("Encrypting message content\n");
 683
 684         /* remove content node from message */
 685         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 686         g_node_unlink(msgcontent->node);
 687
 688         /* create temporary multipart for content */
 689         encmultipart = procmime_mimeinfo_new();
 690         encmultipart->type = MIMETYPE_MULTIPART;
 691         encmultipart->subtype = g_strdup("encrypted");
 692         boundary = generate_mime_boundary("Encrypt");
 693         g_hash_table_insert(encmultipart->typeparameters, g_strdup("boundary"),
 694                             g_strdup(boundary));
 695         g_hash_table_insert(encmultipart->typeparameters, g_strdup("protocol"),
 696                             g_strdup("application/pgp-encrypted"));
 697         g_node_append(encmultipart->node, msgcontent->node);
 698
 699         /* write message content to temporary file */
 700         fp = my_tmpfile();
 701         if (fp == NULL) {
 702                 privacy_set_error(_("Couldn't create temporary file, %s"), strerror(errno));
 703                 g_free(kset);
 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         fclose(fp);
 713
 714         /* encrypt data */
 715         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 716         gpgme_data_new(&gpgenc);
 717         gpgme_set_armor(ctx, 1);
 718         cm_gpgme_data_rewind(gpgtext);
 719
 720         err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 721
 722         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 723         gpgme_data_release(gpgtext);
 724         g_free(textstr);
 725         g_free(kset);
 726
 727         if (enccontent == NULL || len <= 0) {
 728                 g_warning("sgpgme_data_release_and_get_mem failed");
 729                 privacy_set_error(_("Encryption failed, %s"), gpgme_strerror(err));
 730                 gpgme_release(ctx);
 731                 return FALSE;
 732         }
 733
 734         /* create encrypted multipart */
 735         g_node_unlink(msgcontent->node);
 736         procmime_mimeinfo_free_all(msgcontent);
 737         g_node_append(mimeinfo->node, encmultipart->node);
 738
 739         newinfo = procmime_mimeinfo_new();
 740         newinfo->type = MIMETYPE_APPLICATION;
 741         newinfo->subtype = g_strdup("pgp-encrypted");
 742         newinfo->content = MIMECONTENT_MEM;
 743         newinfo->data.mem = g_strdup("Version: 1\n");
 744         g_node_append(encmultipart->node, newinfo->node);
 745
 746         newinfo = procmime_mimeinfo_new();
 747         newinfo->type = MIMETYPE_APPLICATION;
 748         newinfo->subtype = g_strdup("octet-stream");
 749         newinfo->content = MIMECONTENT_MEM;
 750         newinfo->data.mem = g_malloc(len + 1);
 751         g_memmove(newinfo->data.mem, enccontent, len);
 752         newinfo->data.mem[len] = '\0';
 753         g_node_append(encmultipart->node, newinfo->node);
 754
 755         g_free(enccontent);
 756         gpgme_release(ctx);
 757
 758         return TRUE;
 759 }
 760
 761 static PrivacySystem pgpmime_system = {
 762         "pgpmime",                      /* id */
 763         "PGP MIME",                     /* name */
 764
 765         pgpmime_free_privacydata,       /* free_privacydata */
 766
 767         pgpmime_is_signed,              /* is_signed(MimeInfo *) */
 768         pgpmime_check_signature,        /* check_signature(MimeInfo *) */
 769         pgpmime_get_sig_status,         /* get_sig_status(MimeInfo *) */
 770         pgpmime_get_sig_info_short,     /* get_sig_info_short(MimeInfo *) */
 771         pgpmime_get_sig_info_full,      /* get_sig_info_full(MimeInfo *) */
 772
 773         pgpmime_is_encrypted,           /* is_encrypted(MimeInfo *) */
 774         pgpmime_decrypt,                /* decrypt(MimeInfo *) */
 775
 776         TRUE,
 777         pgpmime_sign,
 778
 779         TRUE,
 780         pgpmime_get_encrypt_data,
 781         pgpmime_encrypt,
 782         pgpmime_get_encrypt_warning,
 783         pgpmime_inhibit_encrypt_warning,
 784 };
 785
 786 void pgpmime_init()
 787 {
 788         privacy_register_system(&pgpmime_system);
 789 }
 790
 791 void pgpmime_done()
 792 {
 793         privacy_unregister_system(&pgpmime_system);
 794 }
 795
 796 struct PluginFeature *plugin_provides(void)
 797 {
 798         static struct PluginFeature features[] =
 799                 { {PLUGIN_PRIVACY, N_("PGP/Mime")},
 800                   {PLUGIN_NOTHING, NULL}};
 801         return features;
 802 }
 803 #endif /* USE_GPGME */