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