src/plugins/pgpmime/pgpmime.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2007 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 #endif
  23
  24 #ifdef USE_GPGME
  25
  26 #include "defs.h"
  27 #include <glib.h>
  28 #include <glib/gi18n.h>
  29 #include <gpgme.h>
  30 #include <ctype.h>
  31 #include <errno.h>
  32
  33 #include "utils.h"
  34 #include "privacy.h"
  35 #include "procmime.h"
  36 #include "plugin.h"
  37
  38 #include "pgpmime.h"
  39 #include <plugins/pgpcore/sgpgme.h>
  40 #include <plugins/pgpcore/prefs_gpg.h>
  41 #include <plugins/pgpcore/passphrase.h>
  42
  43 #include "prefs_common.h"
  44
  45 typedef struct _PrivacyDataPGP PrivacyDataPGP;
  46
  47 struct _PrivacyDataPGP
  48 {
  49         PrivacyData     data;
  50
  51         gboolean        done_sigtest;
  52         gboolean        is_signed;
  53         gpgme_verify_result_t   sigstatus;
  54         gpgme_ctx_t     ctx;
  55 };
  56
  57 static PrivacySystem pgpmime_system;
  58
  59 static gint pgpmime_check_signature(MimeInfo *mimeinfo);
  60
  61 static PrivacyDataPGP *pgpmime_new_privacydata()
  62 {
  63         PrivacyDataPGP *data;
  64         gpgme_error_t err;
  65
  66         data = g_new0(PrivacyDataPGP, 1);
  67         data->data.system = &pgpmime_system;
  68         data->done_sigtest = FALSE;
  69         data->is_signed = FALSE;
  70         data->sigstatus = NULL;
  71         if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
  72                 g_warning(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
  73                 return NULL;
  74         }
  75
  76         return data;
  77 }
  78
  79 static void pgpmime_free_privacydata(PrivacyData *_data)
  80 {
  81         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
  82         gpgme_release(data->ctx);
  83         g_free(data);
  84 }
  85
  86 static gboolean pgpmime_is_signed(MimeInfo *mimeinfo)
  87 {
  88         MimeInfo *parent;
  89         MimeInfo *signature;
  90         const gchar *protocol;
  91         PrivacyDataPGP *data = NULL;
  92
  93         g_return_val_if_fail(mimeinfo != NULL, FALSE);
  94         if (mimeinfo->privacy != NULL) {
  95                 data = (PrivacyDataPGP *) mimeinfo->privacy;
  96                 if (data->done_sigtest)
  97                         return data->is_signed;
  98         }
  99
 100         /* check parent */
 101         parent = procmime_mimeinfo_parent(mimeinfo);
 102         if (parent == NULL)
 103                 return FALSE;
 104         if ((parent->type != MIMETYPE_MULTIPART) ||
 105             g_ascii_strcasecmp(parent->subtype, "signed"))
 106                 return FALSE;
 107         protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
 108         if ((protocol == NULL) ||
 109             (g_ascii_strcasecmp(protocol, "application/pgp-signature")))
 110                 return FALSE;
 111
 112         /* check if mimeinfo is the first child */
 113         if (parent->node->children->data != mimeinfo)
 114                 return FALSE;
 115
 116         /* check signature */
 117         signature = parent->node->children->next != NULL ?
 118             (MimeInfo *) parent->node->children->next->data : NULL;
 119         if (signature == NULL)
 120                 return FALSE;
 121         if ((signature->type != MIMETYPE_APPLICATION) ||
 122             (g_ascii_strcasecmp(signature->subtype, "pgp-signature")))
 123                 return FALSE;
 124
 125         if (data == NULL) {
 126                 data = pgpmime_new_privacydata();
 127                 mimeinfo->privacy = (PrivacyData *) data;
 128         }
 129
 130         data->done_sigtest = TRUE;
 131         data->is_signed = TRUE;
 132
 133         return TRUE;
 134 }
 135
 136 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
 137 {
 138         gchar *ret;
 139         GString *textbuffer;
 140         guint boundary_len;
 141         gchar buf[BUFFSIZE];
 142
 143         boundary_len = strlen(boundary);
 144         while (fgets(buf, sizeof(buf), fp) != NULL)
 145                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 146                         break;
 147
 148         textbuffer = g_string_new("");
 149         while (fgets(buf, sizeof(buf), fp) != NULL) {
 150                 gchar *buf2;
 151
 152                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 153                         break;
 154
 155                 buf2 = canonicalize_str(buf);
 156                 g_string_append(textbuffer, buf2);
 157                 g_free(buf2);
 158         }
 159         g_string_truncate(textbuffer, textbuffer->len - 2);
 160
 161         ret = textbuffer->str;
 162         g_string_free(textbuffer, FALSE);
 163
 164         return ret;
 165 }
 166
 167 static gint pgpmime_check_signature(MimeInfo *mimeinfo)
 168 {
 169         PrivacyDataPGP *data;
 170         MimeInfo *parent, *signature;
 171         FILE *fp;
 172         gchar *boundary;
 173         gchar *textstr;
 174         gpgme_data_t sigdata = NULL, textdata = NULL;
 175         gpgme_error_t err;
 176         g_return_val_if_fail(mimeinfo != NULL, -1);
 177         g_return_val_if_fail(mimeinfo->privacy != NULL, -1);
 178         data = (PrivacyDataPGP *) mimeinfo->privacy;
 179         if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
 180                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 181                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 182                 return 0;
 183         }
 184
 185
 186         debug_print("Checking PGP/MIME signature\n");
 187
 188         err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_OpenPGP);
 189
 190         if (err) {
 191                 debug_print ("gpgme_set_protocol failed: %s\n",
 192                    gpgme_strerror (err));
 193         }
 194         parent = procmime_mimeinfo_parent(mimeinfo);
 195
 196         fp = g_fopen(parent->data.filename, "rb");
 197         g_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
 198
 199         boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
 200         if (!boundary) {
 201                 privacy_set_error(_("Signature boundary not found."));
 202                 return 0;
 203         }
 204         textstr = get_canonical_content(fp, boundary);
 205
 206         err = gpgme_data_new_from_mem(&textdata, textstr, (size_t)strlen(textstr), 0);
 207         if (err) {
 208                 debug_print ("gpgme_data_new_from_mem failed: %s\n",
 209                    gpgme_strerror (err));
 210         }
 211         signature = (MimeInfo *) mimeinfo->node->next->data;
 212         sigdata = sgpgme_data_from_mimeinfo(signature);
 213
 214         err = 0;
 215         if (signature->encoding_type == ENC_BASE64) {
 216                 err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
 217         }
 218
 219         if (err) {
 220                 debug_print ("gpgme_data_set_encoding failed: %s\n",
 221                         gpgme_strerror (err));
 222         }
 223
 224         data->sigstatus =
 225                 sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
 226
 227         gpgme_data_release(sigdata);
 228         gpgme_data_release(textdata);
 229         g_free(textstr);
 230         fclose(fp);
 231
 232         return 0;
 233 }
 234
 235 static SignatureStatus pgpmime_get_sig_status(MimeInfo *mimeinfo)
 236 {
 237         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 238
 239         g_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
 240
 241         if (data->sigstatus == NULL &&
 242             prefs_gpg_get_config()->auto_check_signatures)
 243                 pgpmime_check_signature(mimeinfo);
 244
 245         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
 246 }
 247
 248 static gchar *pgpmime_get_sig_info_short(MimeInfo *mimeinfo)
 249 {
 250         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 251
 252         g_return_val_if_fail(data != NULL, g_strdup("Error"));
 253
 254         if (data->sigstatus == NULL &&
 255             prefs_gpg_get_config()->auto_check_signatures)
 256                 pgpmime_check_signature(mimeinfo);
 257
 258         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 259 }
 260
 261 static gchar *pgpmime_get_sig_info_full(MimeInfo *mimeinfo)
 262 {
 263         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 264
 265         g_return_val_if_fail(data != NULL, g_strdup("Error"));
 266
 267         if (data->sigstatus == NULL &&
 268             prefs_gpg_get_config()->auto_check_signatures)
 269                 pgpmime_check_signature(mimeinfo);
 270
 271         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
 272 }
 273
 274 static gboolean pgpmime_is_encrypted(MimeInfo *mimeinfo)
 275 {
 276         MimeInfo *tmpinfo;
 277         const gchar *tmpstr;
 278
 279         if (mimeinfo->type != MIMETYPE_MULTIPART)
 280                 return FALSE;
 281         if (g_ascii_strcasecmp(mimeinfo->subtype, "encrypted"))
 282                 return FALSE;
 283         tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "protocol");
 284         if ((tmpstr == NULL) || g_ascii_strcasecmp(tmpstr, "application/pgp-encrypted"))
 285                 return FALSE;
 286         if (g_node_n_children(mimeinfo->node) != 2)
 287                 return FALSE;
 288
 289         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 0)->data;
 290         if (tmpinfo->type != MIMETYPE_APPLICATION)
 291                 return FALSE;
 292         if (g_ascii_strcasecmp(tmpinfo->subtype, "pgp-encrypted"))
 293                 return FALSE;
 294
 295         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 296         if (tmpinfo->type != MIMETYPE_APPLICATION)
 297                 return FALSE;
 298         if (g_ascii_strcasecmp(tmpinfo->subtype, "octet-stream"))
 299                 return FALSE;
 300
 301         return TRUE;
 302 }
 303
 304 static MimeInfo *pgpmime_decrypt(MimeInfo *mimeinfo)
 305 {
 306         MimeInfo *encinfo, *decinfo, *parseinfo;
 307         gpgme_data_t cipher = NULL, plain = NULL;
 308         static gint id = 0;
 309         FILE *dstfp;
 310         gchar *fname;
 311         gpgme_verify_result_t sigstat = NULL;
 312         PrivacyDataPGP *data = NULL;
 313         gpgme_ctx_t ctx;
 314         gchar *chars;
 315         size_t len;
 316         gpgme_error_t err;
 317
 318         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 319                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 320                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 321                 return NULL;
 322         }
 323
 324         g_return_val_if_fail(pgpmime_is_encrypted(mimeinfo), NULL);
 325
 326         encinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 327
 328         cipher = sgpgme_data_from_mimeinfo(encinfo);
 329         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 330
 331         gpgme_data_release(cipher);
 332         if (plain == NULL) {
 333                 debug_print("plain is null!\n");
 334                 gpgme_release(ctx);
 335                 return NULL;
 336         }
 337
 338         fname = g_strdup_printf("%s%cplaintext.%08x",
 339                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 340
 341         if ((dstfp = g_fopen(fname, "wb")) == NULL) {
 342                 FILE_OP_ERROR(fname, "fopen");
 343                 privacy_set_error(_("Couldn't open decrypted file %s"), fname);
 344                 g_free(fname);
 345                 gpgme_data_release(plain);
 346                 gpgme_release(ctx);
 347                 debug_print("can't open!\n");
 348                 return NULL;
 349         }
 350
 351         if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
 352                 FILE_OP_ERROR(fname, "fprintf");
 353                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 354                 g_free(fname);
 355                 gpgme_data_release(plain);
 356                 gpgme_release(ctx);
 357                 debug_print("can't open!\n");
 358                 return NULL;
 359         }
 360
 361         chars = sgpgme_data_release_and_get_mem(plain, &len);
 362         if (len > 0) {
 363                 if (fwrite(chars, 1, len, dstfp) < len) {
 364                         FILE_OP_ERROR(fname, "fwrite");
 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         if (fclose(dstfp) == EOF) {
 374                 FILE_OP_ERROR(fname, "fclose");
 375                 privacy_set_error(_("Couldn't close 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         parseinfo = procmime_scan_file(fname);
 384         g_free(fname);
 385         if (parseinfo == NULL) {
 386                 gpgme_release(ctx);
 387                 privacy_set_error(_("Couldn't parse decrypted file."));
 388                 return NULL;
 389         }
 390         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 391                 g_node_first_child(parseinfo->node)->data : NULL;
 392         if (decinfo == NULL) {
 393                 privacy_set_error(_("Couldn't parse decrypted file parts."));
 394                 gpgme_release(ctx);
 395                 return NULL;
 396         }
 397
 398         g_node_unlink(decinfo->node);
 399         procmime_mimeinfo_free_all(parseinfo);
 400
 401         decinfo->tmp = TRUE;
 402
 403         if (sigstat != NULL && sigstat->signatures != NULL) {
 404                 if (decinfo->privacy != NULL) {
 405                         data = (PrivacyDataPGP *) decinfo->privacy;
 406                 } else {
 407                         data = pgpmime_new_privacydata();
 408                         decinfo->privacy = (PrivacyData *) data;
 409                 }
 410                 data->done_sigtest = TRUE;
 411                 data->is_signed = TRUE;
 412                 data->sigstatus = sigstat;
 413                 if (data->ctx)
 414                         gpgme_release(data->ctx);
 415                 data->ctx = ctx;
 416         } else
 417                 gpgme_release(ctx);
 418
 419         return decinfo;
 420 }
 421
 422 gboolean pgpmime_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 423 {
 424         MimeInfo *msgcontent, *sigmultipart, *newinfo;
 425         gchar *textstr, *micalg;
 426         FILE *fp;
 427         gchar *boundary = NULL;
 428         gchar *sigcontent;
 429         gpgme_ctx_t ctx;
 430         gpgme_data_t gpgtext, gpgsig;
 431         gpgme_error_t err;
 432         size_t len;
 433         struct passphrase_cb_info_s info;
 434         gpgme_sign_result_t result = NULL;
 435         gchar *test_msg;
 436
 437         fp = my_tmpfile();
 438         if (fp == NULL) {
 439                 privacy_set_error(_("Couldn't create temporary file: %s"), strerror(errno));
 440                 return FALSE;
 441         }
 442         procmime_write_mimeinfo(mimeinfo, fp);
 443         rewind(fp);
 444
 445         /* read temporary file into memory */
 446         test_msg = file_read_stream_to_str(fp);
 447         fclose(fp);
 448
 449         memset (&info, 0, sizeof info);
 450
 451         /* remove content node from message */
 452         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 453         g_node_unlink(msgcontent->node);
 454
 455         /* create temporary multipart for content */
 456         sigmultipart = procmime_mimeinfo_new();
 457         sigmultipart->type = MIMETYPE_MULTIPART;
 458         sigmultipart->subtype = g_strdup("signed");
 459
 460         do {
 461                 g_free(boundary);
 462                 boundary = generate_mime_boundary("Sig");
 463         } while (strstr(test_msg, boundary) != NULL);
 464
 465         g_free(test_msg);
 466
 467         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
 468                             g_strdup(boundary));
 469         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
 470                             g_strdup("application/pgp-signature"));
 471         g_node_append(sigmultipart->node, msgcontent->node);
 472         g_node_append(mimeinfo->node, sigmultipart->node);
 473
 474         /* write message content to temporary file */
 475         fp = my_tmpfile();
 476         if (fp == NULL) {
 477                 perror("my_tmpfile");
 478                 privacy_set_error(_("Couldn't create temporary file: %s"), strerror(errno));
 479                 return FALSE;
 480         }
 481         procmime_write_mimeinfo(sigmultipart, fp);
 482         rewind(fp);
 483
 484         /* read temporary file into memory */
 485         textstr = get_canonical_content(fp, boundary);
 486
 487         fclose(fp);
 488
 489         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 490         gpgme_data_new(&gpgsig);
 491         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 492                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 493                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 494                 return FALSE;
 495         }
 496         gpgme_set_textmode(ctx, 1);
 497         gpgme_set_armor(ctx, 1);
 498         gpgme_signers_clear (ctx);
 499
 500         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 501                 gpgme_release(ctx);
 502                 return FALSE;
 503         }
 504
 505         prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
 506         if (getenv("GPG_AGENT_INFO") && prefs_gpg_get_config()->use_gpg_agent) {
 507                 debug_print("GPG_AGENT_INFO environment defined, running without passphrase callback\n");
 508         } else {
 509                 info.c = ctx;
 510                 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 511         }
 512
 513         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
 514         if (err != GPG_ERR_NO_ERROR) {
 515                 if (err == GPG_ERR_CANCELED) {
 516                         /* ignore cancelled signing */
 517                         privacy_reset_error();
 518                         debug_print("gpgme_op_sign cancelled\n");
 519                 } else {
 520                         privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
 521                         debug_print("gpgme_op_sign error : %x\n", err);
 522                 }
 523                 gpgme_release(ctx);
 524                 return FALSE;
 525         }
 526         result = gpgme_op_sign_result(ctx);
 527         if (result && result->signatures) {
 528                 gpgme_new_signature_t sig = result->signatures;
 529                 if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 530                         micalg = g_strdup_printf("PGP-%s", gpgme_hash_algo_name(
 531                                 result->signatures->hash_algo));
 532                 } else {
 533                         micalg = g_strdup(gpgme_hash_algo_name(
 534                                 result->signatures->hash_algo));
 535                 }
 536                 while (sig) {
 537                         debug_print("valid signature: %s\n", sig->fpr);
 538                         sig = sig->next;
 539                 }
 540         } else if (result && result->invalid_signers) {
 541                 gpgme_invalid_key_t invalid = result->invalid_signers;
 542                 while (invalid) {
 543                         g_warning("invalid signer: %s (%s)", invalid->fpr,
 544                                 gpgme_strerror(invalid->reason));
 545                         privacy_set_error(_("Data signing failed due to invalid signer: %s"),
 546                                 gpgme_strerror(invalid->reason));
 547                         invalid = invalid->next;
 548                 }
 549                 gpgme_release(ctx);
 550                 return FALSE;
 551         } else {
 552                 /* can't get result (maybe no signing key?) */
 553                 debug_print("gpgme_op_sign_result error\n");
 554                 privacy_set_error(_("Data signing failed, no results."));
 555                 gpgme_release(ctx);
 556                 return FALSE;
 557         }
 558
 559         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 560         gpgme_data_release(gpgtext);
 561         g_free(textstr);
 562
 563         if (sigcontent == NULL || len <= 0) {
 564                 g_warning("sgpgme_data_release_and_get_mem failed");
 565                 privacy_set_error(_("Data signing failed, no contents."));
 566                 return FALSE;
 567         }
 568
 569         /* add signature */
 570         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
 571                             micalg);
 572
 573         newinfo = procmime_mimeinfo_new();
 574         newinfo->type = MIMETYPE_APPLICATION;
 575         newinfo->subtype = g_strdup("pgp-signature");
 576         g_hash_table_insert(newinfo->typeparameters, g_strdup("name"),
 577                              g_strdup("signature.asc"));
 578         newinfo->content = MIMECONTENT_MEM;
 579         newinfo->disposition = DISPOSITIONTYPE_ATTACHMENT;
 580         g_hash_table_insert(newinfo->dispositionparameters, g_strdup("filename"),
 581                             g_strdup("signature.asc"));
 582         newinfo->data.mem = g_malloc(len + 1);
 583         g_memmove(newinfo->data.mem, sigcontent, len);
 584         newinfo->data.mem[len] = '\0';
 585         g_node_append(sigmultipart->node, newinfo->node);
 586
 587         g_free(sigcontent);
 588         gpgme_release(ctx);
 589
 590         return TRUE;
 591 }
 592 gchar *pgpmime_get_encrypt_data(GSList *recp_names)
 593 {
 594         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
 595 }
 596
 597 static const gchar *pgpmime_get_encrypt_warning(void)
 598 {
 599         if (prefs_gpg_should_skip_encryption_warning(pgpmime_system.id))
 600                 return NULL;
 601         else
 602                 return _("Please note that email headers, like Subject, "
 603                          "are not encrypted by the PGP/Mime system.");
 604 }
 605
 606 static void pgpmime_inhibit_encrypt_warning(gboolean inhibit)
 607 {
 608         if (inhibit)
 609                 prefs_gpg_add_skip_encryption_warning(pgpmime_system.id);
 610         else
 611                 prefs_gpg_remove_skip_encryption_warning(pgpmime_system.id);
 612 }
 613
 614 gboolean pgpmime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 615 {
 616         MimeInfo *msgcontent, *encmultipart, *newinfo;
 617         FILE *fp;
 618         gchar *boundary, *enccontent;
 619         size_t len;
 620         gchar *textstr;
 621         gpgme_data_t gpgtext = NULL, gpgenc = NULL;
 622         gpgme_ctx_t ctx = NULL;
 623         gpgme_key_t *kset = NULL;
 624         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 625         gint i = 0;
 626         gpgme_error_t err;
 627
 628         while (fprs[i] && strlen(fprs[i])) {
 629                 i++;
 630         }
 631
 632         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 633         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 634         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 635                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 636                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 637                 return FALSE;
 638         }
 639         i = 0;
 640         while (fprs[i] && strlen(fprs[i])) {
 641                 gpgme_key_t key;
 642                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 643                 if (err) {
 644                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 645                         privacy_set_error(_("Couldn't add GPG key %s, %s"), fprs[i], gpgme_strerror(err));
 646                         return FALSE;
 647                 }
 648                 debug_print("found %s at %d\n", fprs[i], i);
 649                 kset[i] = key;
 650                 i++;
 651         }
 652
 653         debug_print("Encrypting message content\n");
 654
 655         /* remove content node from message */
 656         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 657         g_node_unlink(msgcontent->node);
 658
 659         /* create temporary multipart for content */
 660         encmultipart = procmime_mimeinfo_new();
 661         encmultipart->type = MIMETYPE_MULTIPART;
 662         encmultipart->subtype = g_strdup("encrypted");
 663         boundary = generate_mime_boundary("Encrypt");
 664         g_hash_table_insert(encmultipart->typeparameters, g_strdup("boundary"),
 665                             g_strdup(boundary));
 666         g_hash_table_insert(encmultipart->typeparameters, g_strdup("protocol"),
 667                             g_strdup("application/pgp-encrypted"));
 668         g_node_append(encmultipart->node, msgcontent->node);
 669
 670         /* write message content to temporary file */
 671         fp = my_tmpfile();
 672         if (fp == NULL) {
 673                 privacy_set_error(_("Couldn't create temporary file, %s"), strerror(errno));
 674                 return FALSE;
 675         }
 676         procmime_write_mimeinfo(encmultipart, fp);
 677         rewind(fp);
 678
 679         /* read temporary file into memory */
 680         textstr = get_canonical_content(fp, boundary);
 681
 682         fclose(fp);
 683
 684         /* encrypt data */
 685         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 686         gpgme_data_new(&gpgenc);
 687         gpgme_set_armor(ctx, 1);
 688         gpgme_data_rewind(gpgtext);
 689
 690         err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 691
 692         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 693         gpgme_data_release(gpgtext);
 694         g_free(textstr);
 695
 696         if (enccontent == NULL || len <= 0) {
 697                 g_warning("sgpgme_data_release_and_get_mem failed");
 698                 privacy_set_error(_("Encryption failed, %s"), gpgme_strerror(err));
 699                 gpgme_release(ctx);
 700                 return FALSE;
 701         }
 702
 703         /* create encrypted multipart */
 704         g_node_unlink(msgcontent->node);
 705         procmime_mimeinfo_free_all(msgcontent);
 706         g_node_append(mimeinfo->node, encmultipart->node);
 707
 708         newinfo = procmime_mimeinfo_new();
 709         newinfo->type = MIMETYPE_APPLICATION;
 710         newinfo->subtype = g_strdup("pgp-encrypted");
 711         newinfo->content = MIMECONTENT_MEM;
 712         newinfo->data.mem = g_strdup("Version: 1\n");
 713         g_node_append(encmultipart->node, newinfo->node);
 714
 715         newinfo = procmime_mimeinfo_new();
 716         newinfo->type = MIMETYPE_APPLICATION;
 717         newinfo->subtype = g_strdup("octet-stream");
 718         newinfo->content = MIMECONTENT_MEM;
 719         newinfo->data.mem = g_malloc(len + 1);
 720         g_memmove(newinfo->data.mem, enccontent, len);
 721         newinfo->data.mem[len] = '\0';
 722         g_node_append(encmultipart->node, newinfo->node);
 723
 724         g_free(enccontent);
 725         gpgme_release(ctx);
 726
 727         return TRUE;
 728 }
 729
 730 static PrivacySystem pgpmime_system = {
 731         "pgpmime",                      /* id */
 732         "PGP MIME",                     /* name */
 733
 734         pgpmime_free_privacydata,       /* free_privacydata */
 735
 736         pgpmime_is_signed,              /* is_signed(MimeInfo *) */
 737         pgpmime_check_signature,        /* check_signature(MimeInfo *) */
 738         pgpmime_get_sig_status,         /* get_sig_status(MimeInfo *) */
 739         pgpmime_get_sig_info_short,     /* get_sig_info_short(MimeInfo *) */
 740         pgpmime_get_sig_info_full,      /* get_sig_info_full(MimeInfo *) */
 741
 742         pgpmime_is_encrypted,           /* is_encrypted(MimeInfo *) */
 743         pgpmime_decrypt,                /* decrypt(MimeInfo *) */
 744
 745         TRUE,
 746         pgpmime_sign,
 747
 748         TRUE,
 749         pgpmime_get_encrypt_data,
 750         pgpmime_encrypt,
 751         pgpmime_get_encrypt_warning,
 752         pgpmime_inhibit_encrypt_warning,
 753 };
 754
 755 void pgpmime_init()
 756 {
 757         privacy_register_system(&pgpmime_system);
 758 }
 759
 760 void pgpmime_done()
 761 {
 762         privacy_unregister_system(&pgpmime_system);
 763 }
 764
 765 struct PluginFeature *plugin_provides(void)
 766 {
 767         static struct PluginFeature features[] =
 768                 { {PLUGIN_PRIVACY, N_("PGP/Mime")},
 769                   {PLUGIN_NOTHING, NULL}};
 770         return features;
 771 }
 772 #endif /* USE_GPGME */