src/plugins/pgpcore/sgpgme.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2015 the Claws Mail team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #  include "config.h"
  21 #include "claws-features.h"
  22 #endif
  23
  24 #ifdef USE_GPGME
  25
  26 #include <time.h>
  27 #include <gtk/gtk.h>
  28 #include <gpgme.h>
  29 #include <glib.h>
  30 #include <glib/gi18n.h>
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <stdlib.h>
  34 #include <errno.h>
  35 #include <sys/types.h>
  36 #ifndef G_OS_WIN32
  37 #  include <sys/wait.h>
  38 #else
  39 #  include <pthread.h>
  40 #  include <windows.h>
  41 #endif
  42 #if (defined(__DragonFly__) || defined(SOLARIS) || defined (__NetBSD__) || defined (__FreeBSD__) || defined (__OpenBSD__))
  43 #  include <sys/signal.h>
  44 #endif
  45 #ifndef G_OS_WIN32
  46 #include <sys/mman.h>
  47 #endif
  48 #if HAVE_LOCALE_H
  49 #  include <locale.h>
  50 #endif
  51
  52 #include "sgpgme.h"
  53 #include "privacy.h"
  54 #include "prefs_common.h"
  55 #include "utils.h"
  56 #include "alertpanel.h"
  57 #include "passphrase.h"
  58 #include "prefs_gpg.h"
  59 #include "account.h"
  60 #include "select-keys.h"
  61 #include "claws.h"
  62
  63 static void sgpgme_disable_all(void)
  64 {
  65     /* FIXME: set a flag, so that we don't bother the user with failed
  66      * gpgme messages */
  67 }
  68
  69 gpgme_verify_result_t sgpgme_verify_signature(gpgme_ctx_t ctx, gpgme_data_t sig,
  70                                         gpgme_data_t plain, gpgme_data_t dummy)
  71 {
  72         gpgme_verify_result_t status = NULL;
  73         gpgme_error_t err;
  74
  75         if ((err = gpgme_op_verify(ctx, sig, plain, dummy)) != GPG_ERR_NO_ERROR) {
  76                 debug_print("op_verify err %s\n", gpgme_strerror(err));
  77                 privacy_set_error("%s", gpgme_strerror(err));
  78                 return GINT_TO_POINTER(-GPG_ERR_SYSTEM_ERROR);
  79         }
  80         status = gpgme_op_verify_result(ctx);
  81         if (status && status->signatures == NULL) {
  82                 debug_print("no signature found\n");
  83                 privacy_set_error(_("No signature found"));
  84                 return GINT_TO_POINTER(-GPG_ERR_SYSTEM_ERROR);
  85         }
  86         return status;
  87 }
  88
  89 SignatureStatus sgpgme_sigstat_gpgme_to_privacy(gpgme_ctx_t ctx, gpgme_verify_result_t status)
  90 {
  91         gpgme_signature_t sig = NULL;
  92
  93         if (GPOINTER_TO_INT(status) == -GPG_ERR_SYSTEM_ERROR) {
  94                 debug_print("system error\n");
  95                 return SIGNATURE_CHECK_FAILED;
  96         }
  97
  98         if (status == NULL) {
  99                 debug_print("status == NULL\n");
 100                 return SIGNATURE_UNCHECKED;
 101         }
 102         sig = status->signatures;
 103
 104         if (sig == NULL) {
 105                 debug_print("sig == NULL\n");
 106                 return SIGNATURE_UNCHECKED;
 107         }
 108
 109         debug_print("err code %d\n", gpg_err_code(sig->status));
 110         switch (gpg_err_code(sig->status)) {
 111         case GPG_ERR_NO_ERROR:
 112                 switch (sig->validity) {
 113                 case GPGME_VALIDITY_NEVER:
 114                         return SIGNATURE_INVALID;
 115                 case GPGME_VALIDITY_UNKNOWN:
 116                 case GPGME_VALIDITY_UNDEFINED:
 117                 case GPGME_VALIDITY_MARGINAL:
 118                 case GPGME_VALIDITY_FULL:
 119                 case GPGME_VALIDITY_ULTIMATE:
 120                         return SIGNATURE_OK;
 121                 default:
 122                         return SIGNATURE_CHECK_FAILED;
 123                 }
 124         case GPG_ERR_SIG_EXPIRED:
 125         case GPG_ERR_CERT_REVOKED:
 126                 return SIGNATURE_WARN;
 127         case GPG_ERR_KEY_EXPIRED:
 128                 return SIGNATURE_KEY_EXPIRED;
 129         case GPG_ERR_BAD_SIGNATURE:
 130                 return SIGNATURE_INVALID;
 131         case GPG_ERR_NO_PUBKEY:
 132                 return SIGNATURE_CHECK_FAILED;
 133         default:
 134                 return SIGNATURE_CHECK_FAILED;
 135         }
 136         return SIGNATURE_CHECK_FAILED;
 137 }
 138
 139 static const gchar *get_validity_str(unsigned long validity)
 140 {
 141         switch (gpg_err_code(validity)) {
 142         case GPGME_VALIDITY_UNKNOWN:
 143                 return _("Unknown");
 144         case GPGME_VALIDITY_UNDEFINED:
 145                 return _("Undefined");
 146         case GPGME_VALIDITY_NEVER:
 147                 return _("Never");
 148         case GPGME_VALIDITY_MARGINAL:
 149                 return _("Marginal");
 150         case GPGME_VALIDITY_FULL:
 151                 return _("Full");
 152         case GPGME_VALIDITY_ULTIMATE:
 153                 return _("Ultimate");
 154         default:
 155                 return _("Error");
 156         }
 157 }
 158
 159 static const gchar *get_owner_trust_str(unsigned long owner_trust)
 160 {
 161         switch (gpgme_err_code(owner_trust)) {
 162         case GPGME_VALIDITY_NEVER:
 163                 return _("Untrusted");
 164         case GPGME_VALIDITY_MARGINAL:
 165                 return _("Marginal");
 166         case GPGME_VALIDITY_FULL:
 167                 return _("Full");
 168         case GPGME_VALIDITY_ULTIMATE:
 169                 return _("Ultimate");
 170         default:
 171                 return _("Unknown");
 172         }
 173 }
 174
 175 gchar *get_gpg_executable_name()
 176 {
 177         gpgme_engine_info_t e;
 178
 179         if (!gpgme_get_engine_info(&e)) {
 180                 while (e != NULL) {
 181                         if (e->protocol == GPGME_PROTOCOL_OpenPGP
 182                                         && e->file_name != NULL) {
 183                                 debug_print("Found gpg executable: '%s'\n", e->file_name);
 184                                 return e->file_name;
 185                         }
 186                 }
 187         }
 188
 189         return NULL;
 190 }
 191
 192 static gchar *extract_name(const char *uid)
 193 {
 194         if (uid == NULL)
 195                 return NULL;
 196         if (!strncmp(uid, "CN=", 3)) {
 197                 gchar *result = g_strdup(uid+3);
 198                 if (strstr(result, ","))
 199                         *(strstr(result, ",")) = '\0';
 200                 return result;
 201         } else if (strstr(uid, ",CN=")) {
 202                 gchar *result = g_strdup(strstr(uid, ",CN=")+4);
 203                 if (strstr(result, ","))
 204                         *(strstr(result, ",")) = '\0';
 205                 return result;
 206         } else {
 207                 return g_strdup(uid);
 208         }
 209 }
 210 gchar *sgpgme_sigstat_info_short(gpgme_ctx_t ctx, gpgme_verify_result_t status)
 211 {
 212         gpgme_signature_t sig = NULL;
 213         gchar *uname = NULL;
 214         gpgme_key_t key;
 215         gchar *result = NULL;
 216         gpgme_error_t err = 0;
 217         static gboolean warned = FALSE;
 218
 219         if (GPOINTER_TO_INT(status) == -GPG_ERR_SYSTEM_ERROR) {
 220                 return g_strdup_printf(_("The signature can't be checked - %s"), privacy_get_error());
 221         }
 222
 223         if (status == NULL) {
 224                 return g_strdup(_("The signature has not been checked."));
 225         }
 226         sig = status->signatures;
 227         if (sig == NULL) {
 228                 return g_strdup(_("The signature has not been checked."));
 229         }
 230
 231         err = gpgme_get_key(ctx, sig->fpr, &key, 0);
 232         if (gpg_err_code(err) == GPG_ERR_NO_AGENT) {
 233                 if (!warned)
 234                         alertpanel_error(_("PGP Core: Can't get key - no gpg-agent running."));
 235                 else
 236                         g_warning("PGP Core: Can't get key - no gpg-agent running.");
 237                 warned = TRUE;
 238         } else if (gpg_err_code(err) != GPG_ERR_NO_ERROR && gpg_err_code(err) != GPG_ERR_EOF) {
 239                 return g_strdup_printf(_("The signature can't be checked - %s"),
 240                         gpgme_strerror(err));
 241   }
 242
 243         if (key)
 244                 uname = extract_name(key->uids->uid);
 245         else
 246                 uname = g_strdup("<?>");
 247
 248         switch (gpg_err_code(sig->status)) {
 249         case GPG_ERR_NO_ERROR:
 250                switch ((key && key->uids) ? key->uids->validity : GPGME_VALIDITY_UNKNOWN) {
 251                 case GPGME_VALIDITY_ULTIMATE:
 252                         result = g_strdup_printf(_("Good signature from \"%s\" [ultimate]"), uname);
 253                         break;
 254                 case GPGME_VALIDITY_FULL:
 255                         result = g_strdup_printf(_("Good signature from \"%s\" [full]"), uname);
 256                         break;
 257                 case GPGME_VALIDITY_MARGINAL:
 258                         result = g_strdup_printf(_("Good signature from \"%s\" [marginal]"), uname);
 259                         break;
 260                 case GPGME_VALIDITY_UNKNOWN:
 261                 case GPGME_VALIDITY_UNDEFINED:
 262                 case GPGME_VALIDITY_NEVER:
 263                 default:
 264                         if (key) {
 265                                 result = g_strdup_printf(_("Good signature from \"%s\""), uname);
 266                         } else {
 267                                 gchar *id = g_strdup(sig->fpr + strlen(sig->fpr)-8);
 268                                 result = g_strdup_printf(_("Key 0x%s not available to verify this signature"), id);
 269                                 g_free(id);
 270                         }
 271                         break;
 272                }
 273                 break;
 274         case GPG_ERR_SIG_EXPIRED:
 275                 result = g_strdup_printf(_("Expired signature from \"%s\""), uname);
 276                 break;
 277         case GPG_ERR_KEY_EXPIRED:
 278                 result = g_strdup_printf(_("Good signature from \"%s\", but the key has expired"), uname);
 279                 break;
 280         case GPG_ERR_CERT_REVOKED:
 281                 result = g_strdup_printf(_("Good signature from \"%s\", but the key has been revoked"), uname);
 282                 break;
 283         case GPG_ERR_BAD_SIGNATURE:
 284                 result = g_strdup_printf(_("Bad signature from \"%s\""), uname);
 285                 break;
 286         case GPG_ERR_NO_PUBKEY: {
 287                 gchar *id = g_strdup(sig->fpr + strlen(sig->fpr)-8);
 288                 result = g_strdup_printf(_("Key 0x%s not available to verify this signature"), id);
 289                 g_free(id);
 290                 break;
 291                 }
 292         default:
 293                 result = g_strdup(_("The signature has not been checked"));
 294                 break;
 295         }
 296         if (result == NULL)
 297                 result = g_strdup(_("Error"));
 298         g_free(uname);
 299         return result;
 300 }
 301
 302 gchar *sgpgme_sigstat_info_full(gpgme_ctx_t ctx, gpgme_verify_result_t status)
 303 {
 304         gint i = 0;
 305         gchar *ret;
 306         GString *siginfo;
 307         gpgme_signature_t sig = NULL;
 308
 309         siginfo = g_string_sized_new(64);
 310         if (status == NULL) {
 311                 g_string_append_printf(siginfo,
 312                         _("Error checking signature: no status\n"));
 313                 goto bail;
 314          }
 315
 316         sig = status->signatures;
 317
 318         while (sig) {
 319                 char buf[100];
 320                 struct tm lt;
 321                 gpgme_key_t key;
 322                 gpgme_error_t err;
 323                 const gchar *keytype, *keyid, *uid;
 324
 325                 err = gpgme_get_key(ctx, sig->fpr, &key, 0);
 326
 327                 if (err != GPG_ERR_NO_ERROR) {
 328                         key = NULL;
 329                         g_string_append_printf(siginfo,
 330                                 _("Error checking signature: %s\n"),
 331                                 gpgme_strerror(err));
 332                         goto bail;
 333                 }
 334                 if (key) {
 335                         keytype = gpgme_pubkey_algo_name(
 336                                         key->subkeys->pubkey_algo);
 337                         keyid = key->subkeys->keyid;
 338                         uid = key->uids->uid;
 339                 } else {
 340                         keytype = "?";
 341                         keyid = "?";
 342                         uid = "?";
 343                 }
 344
 345                 memset(buf, 0, sizeof(buf));
 346                 fast_strftime(buf, sizeof(buf)-1, prefs_common_get_prefs()->date_format, localtime_r(&sig->timestamp, &lt));
 347                 g_string_append_printf(siginfo,
 348                         _("Signature made on %s using %s key ID %s\n"),
 349                         buf, keytype, keyid);
 350
 351                 switch (gpg_err_code(sig->status)) {
 352                 case GPG_ERR_NO_ERROR:
 353                         g_string_append_printf(siginfo,
 354                                 _("Good signature from uid \"%s\" (Validity: %s)\n"),
 355                                 uid, get_validity_str((key && key->uids) ? key->uids->validity:GPGME_VALIDITY_UNKNOWN));
 356                         break;
 357                 case GPG_ERR_KEY_EXPIRED:
 358                         g_string_append_printf(siginfo,
 359                                 _("Expired key uid \"%s\"\n"),
 360                                 uid);
 361                         break;
 362                 case GPG_ERR_SIG_EXPIRED:
 363                         g_string_append_printf(siginfo,
 364                                 _("Expired signature from uid \"%s\" (Validity: %s)\n"),
 365                                 uid, get_validity_str((key && key->uids) ? key->uids->validity:GPGME_VALIDITY_UNKNOWN));
 366                         break;
 367                 case GPG_ERR_CERT_REVOKED:
 368                         g_string_append_printf(siginfo,
 369                                 _("Revoked key uid \"%s\"\n"),
 370                                 uid);
 371                         break;
 372                 case GPG_ERR_BAD_SIGNATURE:
 373                         g_string_append_printf(siginfo,
 374                                 _("BAD signature from \"%s\"\n"),
 375                                 uid);
 376                         break;
 377                 default:
 378                         break;
 379                 }
 380                 if (sig->status != GPG_ERR_BAD_SIGNATURE) {
 381                         gint j = 1;
 382                         if (key) {
 383                                 key->uids = key->uids ? key->uids->next : NULL;
 384                                 while (key->uids != NULL) {
 385                                         g_string_append_printf(siginfo,
 386                                                 g_strconcat("                    ",
 387                                                             _("uid \"%s\" (Validity: %s)\n"), NULL),
 388                                                 key->uids->uid,
 389                                                 key->uids->revoked==TRUE?_("Revoked"):get_validity_str(key->uids->validity));
 390                                         j++;
 391                                         key->uids = key->uids->next;
 392                                 }
 393                         }
 394                         g_string_append_printf(siginfo,_("Owner Trust: %s\n"),
 395                                                key ? get_owner_trust_str(key->owner_trust) : _("No key!"));
 396                         g_string_append(siginfo,
 397                                 _("Primary key fingerprint:"));
 398                         const char* primary_fpr = NULL;
 399                         if (key && key->subkeys && key->subkeys->fpr)
 400                                 primary_fpr = key->subkeys->fpr;
 401                         else
 402                                 g_string_append(siginfo, " ?");
 403                         int idx; /* now pretty-print the fingerprint */
 404                         for (idx=0; primary_fpr && *primary_fpr!='\0'; idx++, primary_fpr++) {
 405                                 if (idx%4==0)
 406                                         g_string_append_c(siginfo, ' ');
 407                                 if (idx%20==0)
 408                                         g_string_append_c(siginfo, ' ');
 409                                 g_string_append_c(siginfo, (gchar)*primary_fpr);
 410                         }
 411                         g_string_append_c(siginfo, '\n');
 412 #ifdef HAVE_GPGME_PKA_TRUST
 413                         if (sig->pka_trust == 1 && sig->pka_address) {
 414                                 g_string_append_printf(siginfo,
 415                                    _("WARNING: Signer's address \"%s\" "
 416                                       "does not match DNS entry\n"),
 417                                    sig->pka_address);
 418                         }
 419                         else if (sig->pka_trust == 2 && sig->pka_address) {
 420                                 g_string_append_printf(siginfo,
 421                                    _("Verified signer's address is \"%s\"\n"),
 422                                    sig->pka_address);
 423                                 /* FIXME: Compare the address to the
 424                                  * From: address.  */
 425                         }
 426 #endif /*HAVE_GPGME_PKA_TRUST*/
 427                 }
 428
 429                 g_string_append(siginfo, "\n");
 430                 i++;
 431                 sig = sig->next;
 432         }
 433 bail:
 434         ret = siginfo->str;
 435         g_string_free(siginfo, FALSE);
 436         return ret;
 437 }
 438
 439 gpgme_data_t sgpgme_data_from_mimeinfo(MimeInfo *mimeinfo)
 440 {
 441         gpgme_data_t data = NULL;
 442         gpgme_error_t err;
 443         FILE *fp = g_fopen(mimeinfo->data.filename, "rb");
 444
 445         if (!fp)
 446                 return NULL;
 447
 448         err = gpgme_data_new_from_filepart(&data, NULL, fp, mimeinfo->offset, mimeinfo->length);
 449         fclose(fp);
 450
 451         debug_print("data %p (%d %d)\n", (void *)&data, mimeinfo->offset, mimeinfo->length);
 452         if (err) {
 453                 debug_print ("gpgme_data_new_from_file failed: %s\n",
 454                              gpgme_strerror (err));
 455                 privacy_set_error(_("Couldn't get data from message, %s"), gpgme_strerror(err));
 456                 return NULL;
 457         }
 458         return data;
 459 }
 460
 461 gpgme_data_t sgpgme_decrypt_verify(gpgme_data_t cipher, gpgme_verify_result_t *status, gpgme_ctx_t ctx)
 462 {
 463         struct passphrase_cb_info_s info;
 464         gpgme_data_t plain;
 465         gpgme_error_t err;
 466
 467         memset (&info, 0, sizeof info);
 468
 469         if ((err = gpgme_data_new(&plain)) != GPG_ERR_NO_ERROR) {
 470                 gpgme_release(ctx);
 471                 privacy_set_error(_("Couldn't initialize data, %s"), gpgme_strerror(err));
 472                 return NULL;
 473         }
 474
 475         if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 476                 prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
 477                 if (!g_getenv("GPG_AGENT_INFO") || !prefs_gpg_get_config()->use_gpg_agent) {
 478                         info.c = ctx;
 479                         gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 480                 }
 481         } else {
 482                 prefs_gpg_enable_agent(TRUE);
 483                 info.c = ctx;
 484                 gpgme_set_passphrase_cb (ctx, NULL, &info);
 485         }
 486
 487
 488         if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 489                 err = gpgme_op_decrypt_verify(ctx, cipher, plain);
 490                 if (err != GPG_ERR_NO_ERROR) {
 491                         debug_print("can't decrypt (%s)\n", gpgme_strerror(err));
 492                         privacy_set_error("%s", gpgme_strerror(err));
 493                         gpgmegtk_free_passphrase();
 494                         gpgme_data_release(plain);
 495                         return NULL;
 496                 }
 497
 498                 err = cm_gpgme_data_rewind(plain);
 499                 if (err) {
 500                         debug_print("can't seek (%d %d %s)\n", err, errno, g_strerror(errno));
 501                 }
 502
 503                 debug_print("decrypted.\n");
 504                 *status = gpgme_op_verify_result (ctx);
 505         } else {
 506                 err = gpgme_op_decrypt(ctx, cipher, plain);
 507                 if (err != GPG_ERR_NO_ERROR) {
 508                         debug_print("can't decrypt (%s)\n", gpgme_strerror(err));
 509                         privacy_set_error("%s", gpgme_strerror(err));
 510                         gpgmegtk_free_passphrase();
 511                         gpgme_data_release(plain);
 512                         return NULL;
 513                 }
 514
 515                 err = cm_gpgme_data_rewind(plain);
 516                 if (err) {
 517                         debug_print("can't seek (%d %d %s)\n", err, errno, g_strerror(errno));
 518                 }
 519
 520                 debug_print("decrypted.\n");
 521                 *status = gpgme_op_verify_result (ctx);
 522         }
 523         return plain;
 524 }
 525
 526 gchar *sgpgme_get_encrypt_data(GSList *recp_names, gpgme_protocol_t proto)
 527 {
 528         SelectionResult result = KEY_SELECTION_CANCEL;
 529         gpgme_key_t *keys = gpgmegtk_recipient_selection(recp_names, &result,
 530                                 proto);
 531         gchar *ret = NULL;
 532         int i = 0;
 533
 534         if (!keys) {
 535                 if (result == KEY_SELECTION_DONT)
 536                         return g_strdup("_DONT_ENCRYPT_");
 537                 else
 538                         return NULL;
 539         }
 540         while (keys[i]) {
 541                 gpgme_subkey_t skey = keys[i]->subkeys;
 542                 gchar *fpr = skey->fpr;
 543                 gchar *tmp = NULL;
 544                 debug_print("adding %s\n", fpr);
 545                 tmp = g_strconcat(ret?ret:"", fpr, " ", NULL);
 546                 g_free(ret);
 547                 ret = tmp;
 548                 i++;
 549         }
 550         return ret;
 551 }
 552
 553 gboolean sgpgme_setup_signers(gpgme_ctx_t ctx, PrefsAccount *account,
 554                               const gchar *from_addr)
 555 {
 556         GPGAccountConfig *config;
 557         const gchar *signer_addr = account->address;
 558
 559         gpgme_signers_clear(ctx);
 560
 561         if (from_addr)
 562                 signer_addr = from_addr;
 563         config = prefs_gpg_account_get_config(account);
 564
 565         switch(config->sign_key) {
 566         case SIGN_KEY_DEFAULT:
 567                 debug_print("using default gnupg key\n");
 568                 break;
 569         case SIGN_KEY_BY_FROM:
 570                 debug_print("using key for %s\n", signer_addr);
 571                 break;
 572         case SIGN_KEY_CUSTOM:
 573                 debug_print("using key for %s\n", config->sign_key_id);
 574                 break;
 575         }
 576
 577         if (config->sign_key != SIGN_KEY_DEFAULT) {
 578                 const gchar *keyid;
 579                 gpgme_key_t key, found_key;
 580                 gpgme_error_t err;
 581
 582                 if (config->sign_key == SIGN_KEY_BY_FROM)
 583                         keyid = signer_addr;
 584                 else if (config->sign_key == SIGN_KEY_CUSTOM)
 585                         keyid = config->sign_key_id;
 586                 else
 587                         goto bail;
 588
 589                 found_key = NULL;
 590                 /* Look for any key, not just private ones, or GPGMe doesn't
 591                  * correctly set the revoked flag. */
 592                 err = gpgme_op_keylist_start(ctx, keyid, 0);
 593                 while ((err = gpgme_op_keylist_next(ctx, &key)) == 0) {
 594                         if (key == NULL)
 595                                 continue;
 596
 597                         if (!key->can_sign)
 598                                 continue;
 599
 600                         if (key->protocol != gpgme_get_protocol(ctx)) {
 601                                 debug_print("skipping a key (wrong protocol %d)\n", key->protocol);
 602                                 gpgme_key_release(key);
 603                                 continue;
 604                         }
 605
 606                         if (key->expired) {
 607                                 debug_print("skipping a key, expired");
 608                                 gpgme_key_release(key);
 609                                 continue;
 610                         }
 611                         if (key->revoked) {
 612                                 debug_print("skipping a key, revoked");
 613                                 gpgme_key_release(key);
 614                                 continue;
 615                         }
 616                         if (key->disabled) {
 617                                 debug_print("skipping a key, disabled");
 618                                 gpgme_key_release(key);
 619                                 continue;
 620                         }
 621
 622                         if (found_key != NULL) {
 623                                 gpgme_key_release(key);
 624                                 gpgme_op_keylist_end(ctx);
 625                                 g_warning("ambiguous specification of secret key '%s'", keyid);
 626                                 privacy_set_error(_("Secret key specification is ambiguous"));
 627                                 goto bail;
 628                         }
 629
 630                         found_key = key;
 631                 }
 632                 gpgme_op_keylist_end(ctx);
 633
 634                 if (found_key == NULL) {
 635                         g_warning("setup_signers start: %s", gpgme_strerror(err));
 636                         privacy_set_error(_("Secret key not found (%s)"), gpgme_strerror(err));
 637                         goto bail;
 638                 }
 639
 640                 err = gpgme_signers_add(ctx, found_key);
 641                 debug_print("got key (proto %d (pgp %d, smime %d).\n",
 642                             found_key->protocol, GPGME_PROTOCOL_OpenPGP,
 643                             GPGME_PROTOCOL_CMS);
 644                 gpgme_key_release(found_key);
 645
 646                 if (err) {
 647                         g_warning("error adding secret key: %s",
 648                                   gpgme_strerror(err));
 649                         privacy_set_error(_("Error setting secret key: %s"),
 650                                           gpgme_strerror(err));
 651                         goto bail;
 652                 }
 653         }
 654
 655         prefs_gpg_account_free_config(config);
 656
 657         return TRUE;
 658 bail:
 659         prefs_gpg_account_free_config(config);
 660         return FALSE;
 661 }
 662
 663 void sgpgme_init()
 664 {
 665         gchar *ctype_locale = NULL, *messages_locale = NULL;
 666         gchar *ctype_utf8_locale = NULL, *messages_utf8_locale = NULL;
 667         gpgme_error_t err = 0;
 668
 669         gpgme_engine_info_t engineInfo;
 670
 671         if (strcmp(prefs_gpg_get_config()->gpg_path, "") != 0
 672             && access(prefs_gpg_get_config()->gpg_path, X_OK) != -1) {
 673                 err = gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP, prefs_gpg_get_config()->gpg_path, NULL);
 674                 if (err != GPG_ERR_NO_ERROR)
 675                         g_warning("failed to set crypto engine configuration: %s", gpgme_strerror(err));
 676         }
 677
 678         if (gpgme_check_version("1.0.0")) {
 679 #ifdef LC_CTYPE
 680                 debug_print("setting gpgme CTYPE locale\n");
 681 #ifdef G_OS_WIN32
 682                 ctype_locale = g_win32_getlocale();
 683 #else
 684                 ctype_locale = g_strdup(setlocale(LC_CTYPE, NULL));
 685 #endif
 686                 if (ctype_locale) {
 687                         debug_print("setting gpgme CTYPE locale to: %s\n", ctype_locale);
 688                         if (strchr(ctype_locale, '.'))
 689                                 *(strchr(ctype_locale, '.')) = '\0';
 690                         else if (strchr(ctype_locale, '@'))
 691                                 *(strchr(ctype_locale, '@')) = '\0';
 692                         ctype_utf8_locale = g_strconcat(ctype_locale, ".UTF-8", NULL);
 693
 694                         debug_print("setting gpgme locale to UTF8: %s\n", ctype_utf8_locale ? ctype_utf8_locale : "NULL");
 695                         gpgme_set_locale(NULL, LC_CTYPE, ctype_utf8_locale);
 696
 697                         debug_print("done\n");
 698                         g_free(ctype_utf8_locale);
 699                         g_free(ctype_locale);
 700                 } else {
 701                         debug_print("couldn't set gpgme CTYPE locale\n");
 702                 }
 703 #endif
 704 #ifdef LC_MESSAGES
 705                 debug_print("setting gpgme MESSAGES locale\n");
 706 #ifdef G_OS_WIN32
 707                 messages_locale = g_win32_getlocale();
 708 #else
 709                 messages_locale = g_strdup(setlocale(LC_MESSAGES, NULL));
 710 #endif
 711                 if (messages_locale) {
 712                         debug_print("setting gpgme MESSAGES locale to: %s\n", messages_locale);
 713                         if (strchr(messages_locale, '.'))
 714                                 *(strchr(messages_locale, '.')) = '\0';
 715                         else if (strchr(messages_locale, '@'))
 716                                 *(strchr(messages_locale, '@')) = '\0';
 717                         messages_utf8_locale = g_strconcat(messages_locale, ".UTF-8", NULL);
 718                         debug_print("setting gpgme locale to UTF8: %s\n", messages_utf8_locale ? messages_utf8_locale : "NULL");
 719
 720                         gpgme_set_locale(NULL, LC_MESSAGES, messages_utf8_locale);
 721
 722                         debug_print("done\n");
 723                         g_free(messages_utf8_locale);
 724                         g_free(messages_locale);
 725                 } else {
 726                         debug_print("couldn't set gpgme MESSAGES locale\n");
 727                 }
 728 #endif
 729                 if (!gpgme_get_engine_info(&engineInfo)) {
 730                         while (engineInfo) {
 731                                 debug_print("GpgME Protocol: %s\n"
 732                                             "Version: %s (req %s)\n"
 733                                             "Executable: %s\n",
 734                                         gpgme_get_protocol_name(engineInfo->protocol) ? gpgme_get_protocol_name(engineInfo->protocol):"???",
 735                                         engineInfo->version ? engineInfo->version:"???",
 736                                         engineInfo->req_version ? engineInfo->req_version:"???",
 737                                         engineInfo->file_name ? engineInfo->file_name:"???");
 738                                 if (engineInfo->protocol == GPGME_PROTOCOL_OpenPGP
 739                                 &&  gpgme_engine_check_version(engineInfo->protocol) !=
 740                                         GPG_ERR_NO_ERROR) {
 741                                         if (engineInfo->file_name && !engineInfo->version) {
 742                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable: "
 743                                                                    "Engine '%s' isn't installed properly."),
 744                                                                    gpgme_get_protocol_name(engineInfo->protocol),
 745                                                                    engineInfo->file_name);
 746                                         } else if (engineInfo->file_name && engineInfo->version
 747                                           && engineInfo->req_version) {
 748                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable: "
 749                                                                    "Engine '%s' version %s is installed, "
 750                                                                    "but version %s is required.\n"),
 751                                                                    gpgme_get_protocol_name(engineInfo->protocol),
 752                                                                    engineInfo->file_name,
 753                                                                    engineInfo->version,
 754                                                                    engineInfo->req_version);
 755                                         } else {
 756                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable "
 757                                                                    "(unknown problem)"),
 758                                                                    gpgme_get_protocol_name(engineInfo->protocol));
 759                                         }
 760                                 }
 761                                 engineInfo = engineInfo->next;
 762                         }
 763                 }
 764         } else {
 765                 sgpgme_disable_all();
 766
 767                 if (prefs_gpg_get_config()->gpg_warning) {
 768                         AlertValue val;
 769
 770                         val = alertpanel_full
 771                                 (_("Warning"),
 772                                  _("GnuPG is not installed properly, or needs "
 773                                  "to be upgraded.\n"
 774                                  "OpenPGP support disabled."),
 775                                  GTK_STOCK_CLOSE, NULL, NULL, TRUE, NULL,
 776                                  ALERT_WARNING, G_ALERTDEFAULT);
 777                         if (val & G_ALERTDISABLE)
 778                                 prefs_gpg_get_config()->gpg_warning = FALSE;
 779                 }
 780         }
 781 }
 782
 783 void sgpgme_done()
 784 {
 785         gpgmegtk_free_passphrase();
 786 }
 787
 788 #ifdef G_OS_WIN32
 789 struct _ExportCtx {
 790         gboolean done;
 791         gchar *cmd;
 792         DWORD exitcode;
 793 };
 794
 795 static void *_export_threaded(void *arg)
 796 {
 797         struct _ExportCtx *ctx = (struct _ExportCtx *)arg;
 798         gboolean result;
 799
 800         PROCESS_INFORMATION pi = {0};
 801         STARTUPINFO si = {0};
 802
 803         result = CreateProcess(NULL, ctx->cmd, NULL, NULL, FALSE,
 804                         NORMAL_PRIORITY_CLASS | CREATE_NO_WINDOW,
 805                         NULL, NULL, &si, &pi);
 806
 807         if (!result) {
 808                 debug_print("Couldn't execute '%s'\n", ctx->cmd);
 809         } else {
 810                 WaitForSingleObject(pi.hProcess, 10000);
 811                 result = GetExitCodeProcess(pi.hProcess, &ctx->exitcode);
 812                 if (ctx->exitcode == STILL_ACTIVE) {
 813                         debug_print("Process still running, terminating it.\n");
 814                         TerminateProcess(pi.hProcess, 255);
 815                 }
 816
 817                 CloseHandle(pi.hProcess);
 818                 CloseHandle(pi.hThread);
 819
 820                 if (!result) {
 821                         debug_print("Process executed, but we couldn't get its exit code (huh?)\n");
 822                 }
 823         }
 824
 825         ctx->done = TRUE;
 826         return NULL;
 827 }
 828 #endif
 829
 830 void sgpgme_create_secret_key(PrefsAccount *account, gboolean ask_create)
 831 {
 832         AlertValue val = G_ALERTDEFAULT;
 833         gchar *key_parms = NULL;
 834         gchar *name = NULL;
 835         gchar *email = NULL;
 836         gchar *passphrase = NULL, *passphrase_second = NULL;
 837         gint prev_bad = 0;
 838         gchar *tmp = NULL;
 839         gpgme_error_t err = 0;
 840         gpgme_ctx_t ctx;
 841         GtkWidget *window = NULL;
 842         gpgme_genkey_result_t key;
 843         gboolean exported = FALSE;
 844
 845         if (account == NULL)
 846                 account = account_get_default();
 847
 848         if (account->address == NULL) {
 849                 alertpanel_error(_("You have to save the account's information with \"OK\" "
 850                                    "before being able to generate a key pair.\n"));
 851                 return;
 852         }
 853         if (ask_create) {
 854                 val = alertpanel(_("No PGP key found"),
 855                                 _("Claws Mail did not find a secret PGP key, "
 856                                   "which means that you won't be able to sign "
 857                                   "emails or receive encrypted emails.\n"
 858                                   "Do you want to create a new key pair now?"),
 859                                   GTK_STOCK_NO, "+" GTK_STOCK_YES, NULL);
 860                 if (val == G_ALERTDEFAULT) {
 861                         return;
 862                 }
 863         }
 864
 865         if (account->name) {
 866                 name = g_strdup(account->name);
 867         } else {
 868                 name = g_strdup(account->address);
 869         }
 870         email = g_strdup(account->address);
 871         tmp = g_strdup_printf("%s <%s>", account->name?account->name:account->address, account->address);
 872 again:
 873         passphrase = passphrase_mbox(tmp, NULL, prev_bad, 1);
 874         if (passphrase == NULL) {
 875                 g_free(tmp);
 876                 g_free(email);
 877                 g_free(name);
 878                 return;
 879         }
 880         passphrase_second = passphrase_mbox(tmp, NULL, 0, 2);
 881         if (passphrase_second == NULL) {
 882                 g_free(tmp);
 883                 g_free(email);
 884                 g_free(passphrase);
 885                 g_free(name);
 886                 return;
 887         }
 888         if (strcmp(passphrase, passphrase_second)) {
 889                 g_free(passphrase);
 890                 g_free(passphrase_second);
 891                 prev_bad = 1;
 892                 goto again;
 893         }
 894
 895         key_parms = g_strdup_printf("<GnupgKeyParms format=\"internal\">\n"
 896                                         "Key-Type: RSA\n"
 897                                         "Key-Length: 2048\n"
 898                                         "Subkey-Type: RSA\n"
 899                                         "Subkey-Length: 2048\n"
 900                                         "Name-Real: %s\n"
 901                                         "Name-Email: %s\n"
 902                                         "Expire-Date: 0\n"
 903                                         "%s%s%s"
 904                                         "</GnupgKeyParms>\n",
 905                                         name, email,
 906                                         strlen(passphrase)?"Passphrase: ":"",
 907                                         passphrase,
 908                                         strlen(passphrase)?"\n":"");
 909 #ifndef G_PLATFORM_WIN32
 910         if (mlock(passphrase, strlen(passphrase)) == -1)
 911                 debug_print("couldn't lock passphrase\n");
 912         if (mlock(passphrase_second, strlen(passphrase_second)) == -1)
 913                 debug_print("couldn't lock passphrase2\n");
 914 #endif
 915         g_free(tmp);
 916         g_free(email);
 917         g_free(name);
 918         g_free(passphrase_second);
 919         g_free(passphrase);
 920
 921         err = gpgme_new (&ctx);
 922         if (err) {
 923                 alertpanel_error(_("Couldn't generate a new key pair: %s"),
 924                                  gpgme_strerror(err));
 925                 g_free(key_parms);
 926                 return;
 927         }
 928
 929
 930         window = label_window_create(_("Generating your new key pair... Please move the mouse "
 931                               "around to help generate entropy..."));
 932
 933         err = gpgme_op_genkey(ctx, key_parms, NULL, NULL);
 934         g_free(key_parms);
 935
 936         label_window_destroy(window);
 937
 938         if (err) {
 939                 alertpanel_error(_("Couldn't generate a new key pair: %s"), gpgme_strerror(err));
 940                 gpgme_release(ctx);
 941                 return;
 942         }
 943         key = gpgme_op_genkey_result(ctx);
 944         if (key == NULL) {
 945                 alertpanel_error(_("Couldn't generate a new key pair: unknown error"));
 946                 gpgme_release(ctx);
 947                 return;
 948         } else {
 949                 gchar *buf = g_strdup_printf(_("Your new key pair has been generated. "
 950                                     "Its fingerprint is:\n%s\n\nDo you want to export it "
 951                                     "to a keyserver?"),
 952                                     key->fpr ? key->fpr:"null");
 953                 AlertValue val = alertpanel(_("Key generated"), buf,
 954                                   GTK_STOCK_NO, "+" GTK_STOCK_YES, NULL);
 955                 g_free(buf);
 956                 if (val == G_ALERTALTERNATE) {
 957                         gchar *gpgbin = get_gpg_executable_name();
 958                         gchar *cmd = g_strdup_printf("\"%s\" --batch --no-tty --send-keys %s",
 959                                 (gpgbin ? gpgbin : "gpg"), key->fpr);
 960                         debug_print("Executing command: %s\n", cmd);
 961
 962 #ifndef G_OS_WIN32
 963                         int res = 0;
 964                         pid_t pid = 0;
 965                         pid = fork();
 966                         if (pid == -1) {
 967                                 res = -1;
 968                         } else if (pid == 0) {
 969                                 /* son */
 970                                 res = system(cmd);
 971                                 res = WEXITSTATUS(res);
 972                                 _exit(res);
 973                         } else {
 974                                 int status = 0;
 975                                 time_t start_wait = time(NULL);
 976                                 res = -1;
 977                                 do {
 978                                         if (waitpid(pid, &status, WNOHANG) == 0 || !WIFEXITED(status)) {
 979                                                 usleep(200000);
 980                                         } else {
 981                                                 res = WEXITSTATUS(status);
 982                                                 break;
 983                                         }
 984                                         if (time(NULL) - start_wait > 5) {
 985                                                 debug_print("SIGTERM'ing gpg\n");
 986                                                 kill(pid, SIGTERM);
 987                                         }
 988                                         if (time(NULL) - start_wait > 6) {
 989                                                 debug_print("SIGKILL'ing gpg\n");
 990                                                 kill(pid, SIGKILL);
 991                                                 break;
 992                                         }
 993                                 } while(1);
 994                         }
 995
 996                         if (res == 0)
 997                                 exported = TRUE;
 998 #else
 999                         /* We need to call gpg in a separate thread, so that waiting for
1000                          * it to finish does not block the UI. */
1001                         pthread_t pt;
1002                         struct _ExportCtx *ectx = malloc(sizeof(struct _ExportCtx));
1003
1004                         ectx->done = FALSE;
1005                         ectx->exitcode = STILL_ACTIVE;
1006                         ectx->cmd = cmd;
1007
1008                         if (pthread_create(&pt, PTHREAD_CREATE_JOINABLE,
1009                                                 _export_threaded, (void *)ectx) != 0) {
1010                                 debug_print("Couldn't create thread, continuing unthreaded.\n");
1011                                 _export_threaded(ctx);
1012                         } else {
1013                                 debug_print("Thread created, waiting for it to finish...\n");
1014                                 while (!ectx->done)
1015                                         claws_do_idle();
1016                         }
1017
1018                         debug_print("Thread finished.\n");
1019                         pthread_join(pt, NULL);
1020
1021                         if (ectx->exitcode == 0)
1022                                 exported = TRUE;
1023
1024                         g_free(ectx);
1025 #endif
1026                         g_free(cmd);
1027
1028                         if (exported) {
1029                                 alertpanel_notice(_("Key exported."));
1030                         } else {
1031                                 alertpanel_error(_("Couldn't export key."));
1032                         }
1033                 }
1034         }
1035         gpgme_release(ctx);
1036 }
1037
1038 gboolean sgpgme_has_secret_key(void)
1039 {
1040         gpgme_error_t err = 0;
1041         gpgme_ctx_t ctx;
1042         gpgme_key_t key;
1043
1044         err = gpgme_new (&ctx);
1045         if (err) {
1046                 debug_print("err : %s\n", gpgme_strerror(err));
1047                 return TRUE;
1048         }
1049 check_again:
1050         err = gpgme_op_keylist_start(ctx, NULL, TRUE);
1051         if (!err)
1052                 err = gpgme_op_keylist_next(ctx, &key);
1053         gpgme_op_keylist_end(ctx);
1054         if (gpg_err_code(err) == GPG_ERR_EOF) {
1055                 if (gpgme_get_protocol(ctx) != GPGME_PROTOCOL_CMS) {
1056                         gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
1057                         goto check_again;
1058                 }
1059                 gpgme_release(ctx);
1060                 return FALSE;
1061         } else {
1062                 gpgme_release(ctx);
1063                 return TRUE;
1064         }
1065 }
1066
1067 void sgpgme_check_create_key(void)
1068 {
1069         if (prefs_gpg_get_config()->gpg_ask_create_key &&
1070             !sgpgme_has_secret_key()) {
1071                 sgpgme_create_secret_key(NULL, TRUE);
1072         }
1073
1074         prefs_gpg_get_config()->gpg_ask_create_key = FALSE;
1075         prefs_gpg_save_config();
1076 }
1077
1078 void *sgpgme_data_release_and_get_mem(gpgme_data_t data, size_t *len)
1079 {
1080         char buf[BUFSIZ];
1081         void *result = NULL;
1082         ssize_t r = 0;
1083         size_t w = 0;
1084
1085         if (data == NULL)
1086                 return NULL;
1087         if (len == NULL)
1088                 return NULL;
1089
1090         /* I know it's deprecated, but we don't compile with _LARGEFILE */
1091         cm_gpgme_data_rewind(data);
1092         while ((r = gpgme_data_read(data, buf, BUFSIZ)) > 0) {
1093                 void *rresult = realloc(result, r + w);
1094                 if (rresult == NULL) {
1095                         g_warning("can't allocate memory");
1096                         if (result != NULL)
1097                                 free(result);
1098                         return NULL;
1099                 }
1100                 result = rresult;
1101                 memcpy(result+w, buf, r);
1102                 w += r;
1103         }
1104
1105         *len = w;
1106
1107         gpgme_data_release(data);
1108         if (r < 0) {
1109                 free(result);
1110                 *len = 0;
1111                 return NULL;
1112         }
1113         return result;
1114 }
1115
1116 gpgme_error_t cm_gpgme_data_rewind(gpgme_data_t dh)
1117 {
1118 #if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64
1119         if (gpgme_data_seek(dh, (off_t)0, SEEK_SET) == -1)
1120                 return gpg_error_from_errno(errno);
1121         else
1122                 return 0;
1123 #else
1124         return gpgme_data_rewind(dh);
1125 #endif
1126 }
1127
1128 #endif /* USE_GPGME */