src/plugins/pgpcore/sgpgme.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2016 the Claws Mail team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #  include "config.h"
  21 #include "claws-features.h"
  22 #endif
  23
  24 #ifdef USE_GPGME
  25
  26 #include <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 #include "file-utils.h"
  63
  64 static void sgpgme_disable_all(void)
  65 {
  66     /* FIXME: set a flag, so that we don't bother the user with failed
  67      * gpgme messages */
  68 }
  69
  70 gpgme_verify_result_t sgpgme_verify_signature(gpgme_ctx_t ctx, gpgme_data_t sig,
  71                                         gpgme_data_t plain, gpgme_data_t dummy)
  72 {
  73         gpgme_verify_result_t status = NULL;
  74         gpgme_error_t err;
  75
  76         if ((err = gpgme_op_verify(ctx, sig, plain, dummy)) != GPG_ERR_NO_ERROR) {
  77                 debug_print("op_verify err %s\n", gpgme_strerror(err));
  78                 privacy_set_error("%s", gpgme_strerror(err));
  79                 return GINT_TO_POINTER(-GPG_ERR_SYSTEM_ERROR);
  80         }
  81         status = gpgme_op_verify_result(ctx);
  82         if (status && status->signatures == NULL) {
  83                 debug_print("no signature found\n");
  84                 privacy_set_error(_("No signature found"));
  85                 return GINT_TO_POINTER(-GPG_ERR_SYSTEM_ERROR);
  86         }
  87         return status;
  88 }
  89
  90 SignatureStatus sgpgme_sigstat_gpgme_to_privacy(gpgme_ctx_t ctx, gpgme_verify_result_t status)
  91 {
  92         gpgme_signature_t sig = NULL;
  93
  94         if (GPOINTER_TO_INT(status) == -GPG_ERR_SYSTEM_ERROR) {
  95                 debug_print("system error\n");
  96                 return SIGNATURE_CHECK_FAILED;
  97         }
  98
  99         if (status == NULL) {
 100                 debug_print("status == NULL\n");
 101                 return SIGNATURE_UNCHECKED;
 102         }
 103         sig = status->signatures;
 104
 105         if (sig == NULL) {
 106                 debug_print("sig == NULL\n");
 107                 return SIGNATURE_UNCHECKED;
 108         }
 109
 110         debug_print("err code %d\n", gpg_err_code(sig->status));
 111         switch (gpg_err_code(sig->status)) {
 112         case GPG_ERR_NO_ERROR:
 113                 switch (sig->validity) {
 114                 case GPGME_VALIDITY_NEVER:
 115                         return SIGNATURE_INVALID;
 116                 case GPGME_VALIDITY_UNKNOWN:
 117                 case GPGME_VALIDITY_UNDEFINED:
 118                 case GPGME_VALIDITY_MARGINAL:
 119                 case GPGME_VALIDITY_FULL:
 120                 case GPGME_VALIDITY_ULTIMATE:
 121                         return SIGNATURE_OK;
 122                 default:
 123                         return SIGNATURE_CHECK_FAILED;
 124                 }
 125         case GPG_ERR_SIG_EXPIRED:
 126         case GPG_ERR_CERT_REVOKED:
 127                 return SIGNATURE_WARN;
 128         case GPG_ERR_KEY_EXPIRED:
 129                 return SIGNATURE_KEY_EXPIRED;
 130         case GPG_ERR_BAD_SIGNATURE:
 131                 return SIGNATURE_INVALID;
 132         case GPG_ERR_NO_PUBKEY:
 133                 return SIGNATURE_CHECK_FAILED;
 134         default:
 135                 return SIGNATURE_CHECK_FAILED;
 136         }
 137         return SIGNATURE_CHECK_FAILED;
 138 }
 139
 140 static const gchar *get_validity_str(unsigned long validity)
 141 {
 142         switch (gpg_err_code(validity)) {
 143         case GPGME_VALIDITY_UNKNOWN:
 144                 return _("Unknown");
 145         case GPGME_VALIDITY_UNDEFINED:
 146                 return _("Undefined");
 147         case GPGME_VALIDITY_NEVER:
 148                 return _("Never");
 149         case GPGME_VALIDITY_MARGINAL:
 150                 return _("Marginal");
 151         case GPGME_VALIDITY_FULL:
 152                 return _("Full");
 153         case GPGME_VALIDITY_ULTIMATE:
 154                 return _("Ultimate");
 155         default:
 156                 return _("Error");
 157         }
 158 }
 159
 160 static const gchar *get_owner_trust_str(unsigned long owner_trust)
 161 {
 162         switch (gpgme_err_code(owner_trust)) {
 163         case GPGME_VALIDITY_NEVER:
 164                 return _("Untrusted");
 165         case GPGME_VALIDITY_MARGINAL:
 166                 return _("Marginal");
 167         case GPGME_VALIDITY_FULL:
 168                 return _("Full");
 169         case GPGME_VALIDITY_ULTIMATE:
 170                 return _("Ultimate");
 171         default:
 172                 return _("Unknown");
 173         }
 174 }
 175
 176 gchar *get_gpg_executable_name()
 177 {
 178         gpgme_engine_info_t e;
 179
 180         if (!gpgme_get_engine_info(&e)) {
 181                 while (e != NULL) {
 182                         if (e->protocol == GPGME_PROTOCOL_OpenPGP
 183                                         && e->file_name != NULL) {
 184                                 debug_print("Found gpg executable: '%s'\n", e->file_name);
 185                                 return e->file_name;
 186                         }
 187                 }
 188         }
 189
 190         return NULL;
 191 }
 192
 193 static gchar *get_gpg_version_string()
 194 {
 195         gpgme_engine_info_t e;
 196
 197         if (!gpgme_get_engine_info(&e)) {
 198                 while (e != NULL) {
 199                         if (e->protocol == GPGME_PROTOCOL_OpenPGP
 200                                         && e->version != NULL) {
 201                                 debug_print("Got OpenPGP version: '%s'\n", e->version);
 202                                 return e->version;
 203                         }
 204                 }
 205         }
 206
 207         return NULL;
 208 }
 209
 210 static gchar *extract_name(const char *uid)
 211 {
 212         if (uid == NULL)
 213                 return NULL;
 214         if (!strncmp(uid, "CN=", 3)) {
 215                 gchar *result = g_strdup(uid+3);
 216                 if (strstr(result, ","))
 217                         *(strstr(result, ",")) = '\0';
 218                 return result;
 219         } else if (strstr(uid, ",CN=")) {
 220                 gchar *result = g_strdup(strstr(uid, ",CN=")+4);
 221                 if (strstr(result, ","))
 222                         *(strstr(result, ",")) = '\0';
 223                 return result;
 224         } else {
 225                 return g_strdup(uid);
 226         }
 227 }
 228 gchar *sgpgme_sigstat_info_short(gpgme_ctx_t ctx, gpgme_verify_result_t status)
 229 {
 230         gpgme_signature_t sig = NULL;
 231         gchar *uname = NULL;
 232         gpgme_key_t key;
 233         gchar *result = NULL;
 234         gpgme_error_t err = 0;
 235         static gboolean warned = FALSE;
 236
 237         if (GPOINTER_TO_INT(status) == -GPG_ERR_SYSTEM_ERROR) {
 238                 return g_strdup_printf(_("The signature can't be checked - %s"), privacy_get_error());
 239         }
 240
 241         if (status == NULL) {
 242                 return g_strdup(_("The signature has not been checked."));
 243         }
 244         sig = status->signatures;
 245         if (sig == NULL) {
 246                 return g_strdup(_("The signature has not been checked."));
 247         }
 248
 249         err = gpgme_get_key(ctx, sig->fpr, &key, 0);
 250         if (gpg_err_code(err) == GPG_ERR_NO_AGENT) {
 251                 if (!warned)
 252                         alertpanel_error(_("PGP Core: Can't get key - no gpg-agent running."));
 253                 else
 254                         g_warning("PGP Core: Can't get key - no gpg-agent running.");
 255                 warned = TRUE;
 256         } else if (gpg_err_code(err) != GPG_ERR_NO_ERROR && gpg_err_code(err) != GPG_ERR_EOF) {
 257                 return g_strdup_printf(_("The signature can't be checked - %s"),
 258                         gpgme_strerror(err));
 259   }
 260
 261         if (key)
 262                 uname = extract_name(key->uids->uid);
 263         else
 264                 uname = g_strdup("<?>");
 265
 266         switch (gpg_err_code(sig->status)) {
 267         case GPG_ERR_NO_ERROR:
 268                switch ((key && key->uids) ? key->uids->validity : GPGME_VALIDITY_UNKNOWN) {
 269                 case GPGME_VALIDITY_ULTIMATE:
 270                         result = g_strdup_printf(_("Good signature from \"%s\" [ultimate]"), uname);
 271                         break;
 272                 case GPGME_VALIDITY_FULL:
 273                         result = g_strdup_printf(_("Good signature from \"%s\" [full]"), uname);
 274                         break;
 275                 case GPGME_VALIDITY_MARGINAL:
 276                         result = g_strdup_printf(_("Good signature from \"%s\" [marginal]"), uname);
 277                         break;
 278                 case GPGME_VALIDITY_UNKNOWN:
 279                 case GPGME_VALIDITY_UNDEFINED:
 280                 case GPGME_VALIDITY_NEVER:
 281                 default:
 282                         if (key) {
 283                                 result = g_strdup_printf(_("Good signature from \"%s\""), uname);
 284                         } else {
 285                                 result = g_strdup_printf(_("Key 0x%s not available to verify this signature"), sig->fpr);
 286                         }
 287                         break;
 288                }
 289                 break;
 290         case GPG_ERR_SIG_EXPIRED:
 291                 result = g_strdup_printf(_("Expired signature from \"%s\""), uname);
 292                 break;
 293         case GPG_ERR_KEY_EXPIRED:
 294                 result = g_strdup_printf(_("Good signature from \"%s\", but the key has expired"), uname);
 295                 break;
 296         case GPG_ERR_CERT_REVOKED:
 297                 result = g_strdup_printf(_("Good signature from \"%s\", but the key has been revoked"), uname);
 298                 break;
 299         case GPG_ERR_BAD_SIGNATURE:
 300                 result = g_strdup_printf(_("Bad signature from \"%s\""), uname);
 301                 break;
 302         case GPG_ERR_NO_PUBKEY: {
 303                 result = g_strdup_printf(_("Key 0x%s not available to verify this signature"), sig->fpr);
 304                 break;
 305                 }
 306         default:
 307                 result = g_strdup(_("The signature has not been checked"));
 308                 break;
 309         }
 310         if (result == NULL)
 311                 result = g_strdup(_("Error"));
 312         g_free(uname);
 313         return result;
 314 }
 315
 316 gchar *sgpgme_sigstat_info_full(gpgme_ctx_t ctx, gpgme_verify_result_t status)
 317 {
 318         gint i = 0;
 319         gchar *ret;
 320         GString *siginfo;
 321         gpgme_signature_t sig = NULL;
 322
 323         siginfo = g_string_sized_new(64);
 324         if (status == NULL) {
 325                 g_string_append_printf(siginfo,
 326                         _("Error checking signature: no status\n"));
 327                 goto bail;
 328          }
 329
 330         sig = status->signatures;
 331
 332         while (sig) {
 333                 char buf[100];
 334                 struct tm lt;
 335                 gpgme_key_t key;
 336                 gpgme_error_t err;
 337                 const gchar *keytype, *keyid, *uid;
 338
 339                 err = gpgme_get_key(ctx, sig->fpr, &key, 0);
 340
 341                 if (err != GPG_ERR_NO_ERROR) {
 342                         key = NULL;
 343                         g_string_append_printf(siginfo,
 344                                 _("Error checking signature: %s\n"),
 345                                 gpgme_strerror(err));
 346                         goto bail;
 347                 }
 348                 if (key) {
 349                         keytype = gpgme_pubkey_algo_name(
 350                                         key->subkeys->pubkey_algo);
 351                         keyid = key->subkeys->keyid;
 352                         uid = key->uids->uid;
 353                 } else {
 354                         keytype = "?";
 355                         keyid = "?";
 356                         uid = "?";
 357                 }
 358
 359                 memset(buf, 0, sizeof(buf));
 360                 fast_strftime(buf, sizeof(buf)-1, prefs_common_get_prefs()->date_format, localtime_r(&sig->timestamp, &lt));
 361                 g_string_append_printf(siginfo,
 362                         _("Signature made on %s using %s key ID %s\n"),
 363                         buf, keytype, keyid);
 364
 365                 switch (gpg_err_code(sig->status)) {
 366                 case GPG_ERR_NO_ERROR:
 367                         g_string_append_printf(siginfo,
 368                                 _("Good signature from uid \"%s\" (Validity: %s)\n"),
 369                                 uid, get_validity_str((key && key->uids) ? key->uids->validity:GPGME_VALIDITY_UNKNOWN));
 370                         break;
 371                 case GPG_ERR_KEY_EXPIRED:
 372                         g_string_append_printf(siginfo,
 373                                 _("Expired key uid \"%s\"\n"),
 374                                 uid);
 375                         break;
 376                 case GPG_ERR_SIG_EXPIRED:
 377                         g_string_append_printf(siginfo,
 378                                 _("Expired signature from uid \"%s\" (Validity: %s)\n"),
 379                                 uid, get_validity_str((key && key->uids) ? key->uids->validity:GPGME_VALIDITY_UNKNOWN));
 380                         break;
 381                 case GPG_ERR_CERT_REVOKED:
 382                         g_string_append_printf(siginfo,
 383                                 _("Revoked key uid \"%s\"\n"),
 384                                 uid);
 385                         break;
 386                 case GPG_ERR_BAD_SIGNATURE:
 387                         g_string_append_printf(siginfo,
 388                                 _("BAD signature from \"%s\"\n"),
 389                                 uid);
 390                         break;
 391                 default:
 392                         break;
 393                 }
 394                 if (sig->status != GPG_ERR_BAD_SIGNATURE) {
 395                         gint j = 1;
 396                         if (key) {
 397                                 key->uids = key->uids ? key->uids->next : NULL;
 398                                 while (key->uids != NULL) {
 399                                         g_string_append_printf(siginfo,
 400                                                 g_strconcat("                    ",
 401                                                             _("uid \"%s\" (Validity: %s)\n"), NULL),
 402                                                 key->uids->uid,
 403                                                 key->uids->revoked==TRUE?_("Revoked"):get_validity_str(key->uids->validity));
 404                                         j++;
 405                                         key->uids = key->uids->next;
 406                                 }
 407                         }
 408                         g_string_append_printf(siginfo,_("Owner Trust: %s\n"),
 409                                                key ? get_owner_trust_str(key->owner_trust) : _("No key!"));
 410                         g_string_append(siginfo,
 411                                 _("Primary key fingerprint:"));
 412                         const char* primary_fpr = NULL;
 413                         if (key && key->subkeys && key->subkeys->fpr)
 414                                 primary_fpr = key->subkeys->fpr;
 415                         else
 416                                 g_string_append(siginfo, " ?");
 417                         int idx; /* now pretty-print the fingerprint */
 418                         for (idx=0; primary_fpr && *primary_fpr!='\0'; idx++, primary_fpr++) {
 419                                 if (idx%4==0)
 420                                         g_string_append_c(siginfo, ' ');
 421                                 if (idx%20==0)
 422                                         g_string_append_c(siginfo, ' ');
 423                                 g_string_append_c(siginfo, (gchar)*primary_fpr);
 424                         }
 425                         g_string_append_c(siginfo, '\n');
 426 #ifdef HAVE_GPGME_PKA_TRUST
 427                         if (sig->pka_trust == 1 && sig->pka_address) {
 428                                 g_string_append_printf(siginfo,
 429                                    _("WARNING: Signer's address \"%s\" "
 430                                       "does not match DNS entry\n"),
 431                                    sig->pka_address);
 432                         }
 433                         else if (sig->pka_trust == 2 && sig->pka_address) {
 434                                 g_string_append_printf(siginfo,
 435                                    _("Verified signer's address is \"%s\"\n"),
 436                                    sig->pka_address);
 437                                 /* FIXME: Compare the address to the
 438                                  * From: address.  */
 439                         }
 440 #endif /*HAVE_GPGME_PKA_TRUST*/
 441                 }
 442
 443                 g_string_append(siginfo, "\n");
 444                 i++;
 445                 sig = sig->next;
 446         }
 447 bail:
 448         ret = siginfo->str;
 449         g_string_free(siginfo, FALSE);
 450         return ret;
 451 }
 452
 453 gpgme_data_t sgpgme_data_from_mimeinfo(MimeInfo *mimeinfo)
 454 {
 455         gpgme_data_t data = NULL;
 456         gpgme_error_t err;
 457         FILE *fp = claws_fopen(mimeinfo->data.filename, "rb");
 458
 459         if (!fp)
 460                 return NULL;
 461
 462         err = gpgme_data_new_from_filepart(&data, NULL, fp, mimeinfo->offset, mimeinfo->length);
 463         claws_fclose(fp);
 464
 465         debug_print("data %p (%d %d)\n", (void *)&data, mimeinfo->offset, mimeinfo->length);
 466         if (err) {
 467                 debug_print ("gpgme_data_new_from_file failed: %s\n",
 468                              gpgme_strerror (err));
 469                 privacy_set_error(_("Couldn't get data from message, %s"), gpgme_strerror(err));
 470                 return NULL;
 471         }
 472         return data;
 473 }
 474
 475 gpgme_data_t sgpgme_decrypt_verify(gpgme_data_t cipher, gpgme_verify_result_t *status, gpgme_ctx_t ctx)
 476 {
 477         struct passphrase_cb_info_s info;
 478         gpgme_data_t plain;
 479         gpgme_error_t err;
 480
 481         memset (&info, 0, sizeof info);
 482
 483         if ((err = gpgme_data_new(&plain)) != GPG_ERR_NO_ERROR) {
 484                 gpgme_release(ctx);
 485                 privacy_set_error(_("Couldn't initialize data, %s"), gpgme_strerror(err));
 486                 return NULL;
 487         }
 488
 489         if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 490                 prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
 491                 if (!g_getenv("GPG_AGENT_INFO") || !prefs_gpg_get_config()->use_gpg_agent) {
 492                         info.c = ctx;
 493                         gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 494                 }
 495         } else {
 496                 prefs_gpg_enable_agent(TRUE);
 497                 info.c = ctx;
 498                 gpgme_set_passphrase_cb (ctx, NULL, &info);
 499         }
 500
 501
 502         if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 503                 err = gpgme_op_decrypt_verify(ctx, cipher, plain);
 504                 if (err != GPG_ERR_NO_ERROR) {
 505                         debug_print("can't decrypt (%s)\n", gpgme_strerror(err));
 506                         privacy_set_error("%s", gpgme_strerror(err));
 507                         gpgmegtk_free_passphrase();
 508                         gpgme_data_release(plain);
 509                         return NULL;
 510                 }
 511
 512                 err = cm_gpgme_data_rewind(plain);
 513                 if (err) {
 514                         debug_print("can't seek (%d %d %s)\n", err, errno, g_strerror(errno));
 515                 }
 516
 517                 debug_print("decrypted.\n");
 518                 *status = gpgme_op_verify_result (ctx);
 519         } else {
 520                 err = gpgme_op_decrypt(ctx, cipher, plain);
 521                 if (err != GPG_ERR_NO_ERROR) {
 522                         debug_print("can't decrypt (%s)\n", gpgme_strerror(err));
 523                         privacy_set_error("%s", gpgme_strerror(err));
 524                         gpgmegtk_free_passphrase();
 525                         gpgme_data_release(plain);
 526                         return NULL;
 527                 }
 528
 529                 err = cm_gpgme_data_rewind(plain);
 530                 if (err) {
 531                         debug_print("can't seek (%d %d %s)\n", err, errno, g_strerror(errno));
 532                 }
 533
 534                 debug_print("decrypted.\n");
 535                 *status = gpgme_op_verify_result (ctx);
 536         }
 537         return plain;
 538 }
 539
 540 gchar *sgpgme_get_encrypt_data(GSList *recp_names, gpgme_protocol_t proto)
 541 {
 542         SelectionResult result = KEY_SELECTION_CANCEL;
 543         gpgme_key_t *keys = gpgmegtk_recipient_selection(recp_names, &result,
 544                                 proto);
 545         gchar *ret = NULL;
 546         int i = 0;
 547
 548         if (!keys) {
 549                 if (result == KEY_SELECTION_DONT)
 550                         return g_strdup("_DONT_ENCRYPT_");
 551                 else
 552                         return NULL;
 553         }
 554         while (keys[i]) {
 555                 gpgme_subkey_t skey = keys[i]->subkeys;
 556                 gchar *fpr = skey->fpr;
 557                 gchar *tmp = NULL;
 558                 debug_print("adding %s\n", fpr);
 559                 tmp = g_strconcat(ret?ret:"", fpr, " ", NULL);
 560                 g_free(ret);
 561                 ret = tmp;
 562                 i++;
 563         }
 564         return ret;
 565 }
 566
 567 gboolean sgpgme_setup_signers(gpgme_ctx_t ctx, PrefsAccount *account,
 568                               const gchar *from_addr)
 569 {
 570         GPGAccountConfig *config;
 571         const gchar *signer_addr = account->address;
 572         SignKeyType sk;
 573         gchar *skid;
 574         gboolean smime = FALSE;
 575
 576         gpgme_signers_clear(ctx);
 577
 578         if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_CMS)
 579                 smime = TRUE;
 580
 581         if (from_addr)
 582                 signer_addr = from_addr;
 583         config = prefs_gpg_account_get_config(account);
 584
 585         if(smime) {
 586                 debug_print("sgpgme_setup_signers: S/MIME protocol\n");
 587                 sk = config->smime_sign_key;
 588                 skid = config->smime_sign_key_id;
 589         } else {
 590                 debug_print("sgpgme_setup_signers: OpenPGP protocol\n");
 591                 sk = config->sign_key;
 592                 skid = config->sign_key_id;
 593         }
 594
 595         switch(sk) {
 596         case SIGN_KEY_DEFAULT:
 597                 debug_print("using default gnupg key\n");
 598                 break;
 599         case SIGN_KEY_BY_FROM:
 600                 debug_print("using key for %s\n", signer_addr);
 601                 break;
 602         case SIGN_KEY_CUSTOM:
 603                 debug_print("using key for %s\n", skid);
 604                 break;
 605         }
 606
 607         if (sk != SIGN_KEY_DEFAULT) {
 608                 const gchar *keyid;
 609                 gpgme_key_t key, found_key;
 610                 gpgme_error_t err;
 611
 612                 if (sk == SIGN_KEY_BY_FROM)
 613                         keyid = signer_addr;
 614                 else if (sk == SIGN_KEY_CUSTOM)
 615                         keyid = skid;
 616                 else
 617                         goto bail;
 618
 619                 found_key = NULL;
 620                 /* Look for any key, not just private ones, or GPGMe doesn't
 621                  * correctly set the revoked flag. */
 622                 err = gpgme_op_keylist_start(ctx, keyid, 0);
 623                 while (err == 0) {
 624                         if ((err = gpgme_op_keylist_next(ctx, &key)) != 0)
 625                                 break;
 626
 627                         if (key == NULL)
 628                                 continue;
 629
 630                         if (!key->can_sign) {
 631                                 debug_print("skipping a key, can not be used for signing\n");
 632                                 gpgme_key_unref(key);
 633                                 continue;
 634                         }
 635
 636                         if (key->protocol != gpgme_get_protocol(ctx)) {
 637                                 debug_print("skipping a key (wrong protocol %d)\n", key->protocol);
 638                                 gpgme_key_unref(key);
 639                                 continue;
 640                         }
 641
 642                         if (key->expired) {
 643                                 debug_print("skipping a key, expired\n");
 644                                 gpgme_key_unref(key);
 645                                 continue;
 646                         }
 647                         if (key->revoked) {
 648                                 debug_print("skipping a key, revoked\n");
 649                                 gpgme_key_unref(key);
 650                                 continue;
 651                         }
 652                         if (key->disabled) {
 653                                 debug_print("skipping a key, disabled\n");
 654                                 gpgme_key_unref(key);
 655                                 continue;
 656                         }
 657
 658                         if (found_key != NULL) {
 659                                 gpgme_key_unref(key);
 660                                 gpgme_op_keylist_end(ctx);
 661                                 g_warning("ambiguous specification of secret key '%s'", keyid);
 662                                 privacy_set_error(_("Secret key specification is ambiguous"));
 663                                 goto bail;
 664                         }
 665
 666                         found_key = key;
 667                 }
 668                 gpgme_op_keylist_end(ctx);
 669
 670                 if (found_key == NULL) {
 671                         g_warning("setup_signers start: %s", gpgme_strerror(err));
 672                         privacy_set_error(_("Secret key not found (%s)"), gpgme_strerror(err));
 673                         goto bail;
 674                 }
 675
 676                 err = gpgme_signers_add(ctx, found_key);
 677                 debug_print("got key (proto %d (pgp %d, smime %d).\n",
 678                             found_key->protocol, GPGME_PROTOCOL_OpenPGP,
 679                             GPGME_PROTOCOL_CMS);
 680                 gpgme_key_unref(found_key);
 681
 682                 if (err) {
 683                         g_warning("error adding secret key: %s",
 684                                   gpgme_strerror(err));
 685                         privacy_set_error(_("Error setting secret key: %s"),
 686                                           gpgme_strerror(err));
 687                         goto bail;
 688                 }
 689         }
 690
 691         prefs_gpg_account_free_config(config);
 692
 693         return TRUE;
 694 bail:
 695         prefs_gpg_account_free_config(config);
 696         return FALSE;
 697 }
 698
 699 void sgpgme_init()
 700 {
 701         gchar *ctype_locale = NULL, *messages_locale = NULL;
 702         gchar *ctype_utf8_locale = NULL, *messages_utf8_locale = NULL;
 703         gpgme_error_t err = 0;
 704
 705         gpgme_engine_info_t engineInfo;
 706
 707         if (strcmp(prefs_gpg_get_config()->gpg_path, "") != 0
 708             && access(prefs_gpg_get_config()->gpg_path, X_OK) != -1) {
 709                 err = gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP, prefs_gpg_get_config()->gpg_path, NULL);
 710                 if (err != GPG_ERR_NO_ERROR)
 711                         g_warning("failed to set crypto engine configuration: %s", gpgme_strerror(err));
 712         }
 713
 714         if (gpgme_check_version("1.0.0")) {
 715 #ifdef LC_CTYPE
 716                 debug_print("setting gpgme CTYPE locale\n");
 717 #ifdef G_OS_WIN32
 718                 ctype_locale = g_win32_getlocale();
 719 #else
 720                 ctype_locale = g_strdup(setlocale(LC_CTYPE, NULL));
 721 #endif
 722                 if (ctype_locale) {
 723                         debug_print("setting gpgme CTYPE locale to: %s\n", ctype_locale);
 724                         if (strchr(ctype_locale, '.'))
 725                                 *(strchr(ctype_locale, '.')) = '\0';
 726                         else if (strchr(ctype_locale, '@'))
 727                                 *(strchr(ctype_locale, '@')) = '\0';
 728                         ctype_utf8_locale = g_strconcat(ctype_locale, ".UTF-8", NULL);
 729
 730                         debug_print("setting gpgme locale to UTF8: %s\n", ctype_utf8_locale ? ctype_utf8_locale : "NULL");
 731                         gpgme_set_locale(NULL, LC_CTYPE, ctype_utf8_locale);
 732
 733                         debug_print("done\n");
 734                         g_free(ctype_utf8_locale);
 735                         g_free(ctype_locale);
 736                 } else {
 737                         debug_print("couldn't set gpgme CTYPE locale\n");
 738                 }
 739 #endif
 740 #ifdef LC_MESSAGES
 741                 debug_print("setting gpgme MESSAGES locale\n");
 742 #ifdef G_OS_WIN32
 743                 messages_locale = g_win32_getlocale();
 744 #else
 745                 messages_locale = g_strdup(setlocale(LC_MESSAGES, NULL));
 746 #endif
 747                 if (messages_locale) {
 748                         debug_print("setting gpgme MESSAGES locale to: %s\n", messages_locale);
 749                         if (strchr(messages_locale, '.'))
 750                                 *(strchr(messages_locale, '.')) = '\0';
 751                         else if (strchr(messages_locale, '@'))
 752                                 *(strchr(messages_locale, '@')) = '\0';
 753                         messages_utf8_locale = g_strconcat(messages_locale, ".UTF-8", NULL);
 754                         debug_print("setting gpgme locale to UTF8: %s\n", messages_utf8_locale ? messages_utf8_locale : "NULL");
 755
 756                         gpgme_set_locale(NULL, LC_MESSAGES, messages_utf8_locale);
 757
 758                         debug_print("done\n");
 759                         g_free(messages_utf8_locale);
 760                         g_free(messages_locale);
 761                 } else {
 762                         debug_print("couldn't set gpgme MESSAGES locale\n");
 763                 }
 764 #endif
 765                 if (!gpgme_get_engine_info(&engineInfo)) {
 766                         while (engineInfo) {
 767                                 debug_print("GpgME Protocol: %s\n"
 768                                             "Version: %s (req %s)\n"
 769                                             "Executable: %s\n",
 770                                         gpgme_get_protocol_name(engineInfo->protocol) ? gpgme_get_protocol_name(engineInfo->protocol):"???",
 771                                         engineInfo->version ? engineInfo->version:"???",
 772                                         engineInfo->req_version ? engineInfo->req_version:"???",
 773                                         engineInfo->file_name ? engineInfo->file_name:"???");
 774                                 if (engineInfo->protocol == GPGME_PROTOCOL_OpenPGP
 775                                 &&  gpgme_engine_check_version(engineInfo->protocol) !=
 776                                         GPG_ERR_NO_ERROR) {
 777                                         if (engineInfo->file_name && !engineInfo->version) {
 778                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable: "
 779                                                                    "Engine '%s' isn't installed properly."),
 780                                                                    gpgme_get_protocol_name(engineInfo->protocol),
 781                                                                    engineInfo->file_name);
 782                                         } else if (engineInfo->file_name && engineInfo->version
 783                                           && engineInfo->req_version) {
 784                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable: "
 785                                                                    "Engine '%s' version %s is installed, "
 786                                                                    "but version %s is required.\n"),
 787                                                                    gpgme_get_protocol_name(engineInfo->protocol),
 788                                                                    engineInfo->file_name,
 789                                                                    engineInfo->version,
 790                                                                    engineInfo->req_version);
 791                                         } else {
 792                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable "
 793                                                                    "(unknown problem)"),
 794                                                                    gpgme_get_protocol_name(engineInfo->protocol));
 795                                         }
 796                                 }
 797                                 engineInfo = engineInfo->next;
 798                         }
 799                 }
 800         } else {
 801                 sgpgme_disable_all();
 802
 803                 if (prefs_gpg_get_config()->gpg_warning) {
 804                         AlertValue val;
 805
 806                         val = alertpanel_full
 807                                 (_("Warning"),
 808                                  _("GnuPG is not installed properly, or needs "
 809                                  "to be upgraded.\n"
 810                                  "OpenPGP support disabled."),
 811                                  GTK_STOCK_CLOSE, NULL, NULL, ALERTFOCUS_FIRST, TRUE, NULL,
 812                                  ALERT_WARNING);
 813                         if (val & G_ALERTDISABLE)
 814                                 prefs_gpg_get_config()->gpg_warning = FALSE;
 815                 }
 816         }
 817 }
 818
 819 void sgpgme_done()
 820 {
 821         gpgmegtk_free_passphrase();
 822 }
 823
 824 #ifdef G_OS_WIN32
 825 struct _ExportCtx {
 826         gboolean done;
 827         gchar *cmd;
 828         DWORD exitcode;
 829 };
 830
 831 static void *_export_threaded(void *arg)
 832 {
 833         struct _ExportCtx *ctx = (struct _ExportCtx *)arg;
 834         gboolean result;
 835
 836         PROCESS_INFORMATION pi = {0};
 837         STARTUPINFO si = {0};
 838
 839         result = CreateProcess(NULL, ctx->cmd, NULL, NULL, FALSE,
 840                         NORMAL_PRIORITY_CLASS | CREATE_NO_WINDOW,
 841                         NULL, NULL, &si, &pi);
 842
 843         if (!result) {
 844                 debug_print("Couldn't execute '%s'\n", ctx->cmd);
 845         } else {
 846                 WaitForSingleObject(pi.hProcess, 10000);
 847                 result = GetExitCodeProcess(pi.hProcess, &ctx->exitcode);
 848                 if (ctx->exitcode == STILL_ACTIVE) {
 849                         debug_print("Process still running, terminating it.\n");
 850                         TerminateProcess(pi.hProcess, 255);
 851                 }
 852
 853                 CloseHandle(pi.hProcess);
 854                 CloseHandle(pi.hThread);
 855
 856                 if (!result) {
 857                         debug_print("Process executed, but we couldn't get its exit code (huh?)\n");
 858                 }
 859         }
 860
 861         ctx->done = TRUE;
 862         return NULL;
 863 }
 864 #endif
 865
 866 void sgpgme_create_secret_key(PrefsAccount *account, gboolean ask_create)
 867 {
 868         AlertValue val = G_ALERTDEFAULT;
 869         gchar *key_parms = NULL;
 870         gchar *name = NULL;
 871         gchar *email = NULL;
 872         gchar *passphrase = NULL, *passphrase_second = NULL;
 873         gint prev_bad = 0;
 874         gchar *tmp = NULL, *gpgver;
 875         gpgme_error_t err = 0;
 876         gpgme_ctx_t ctx;
 877         GtkWidget *window = NULL;
 878         gpgme_genkey_result_t key;
 879         gboolean exported = FALSE;
 880
 881         if (account == NULL)
 882                 account = account_get_default();
 883
 884         if (account->address == NULL) {
 885                 alertpanel_error(_("You have to save the account's information with \"OK\" "
 886                                    "before being able to generate a key pair.\n"));
 887                 return;
 888         }
 889         if (ask_create) {
 890                 val = alertpanel(_("No PGP key found"),
 891                                 _("Claws Mail did not find a secret PGP key, "
 892                                   "which means that you won't be able to sign "
 893                                   "emails or receive encrypted emails.\n"
 894                                   "Do you want to create a new key pair now?"),
 895                                   GTK_STOCK_NO, GTK_STOCK_YES, NULL, ALERTFOCUS_SECOND);
 896                 if (val == G_ALERTDEFAULT) {
 897                         return;
 898                 }
 899         }
 900
 901         if (account->name) {
 902                 name = g_strdup(account->name);
 903         } else {
 904                 name = g_strdup(account->address);
 905         }
 906         email = g_strdup(account->address);
 907         tmp = g_strdup_printf("%s <%s>", account->name?account->name:account->address, account->address);
 908         gpgver = get_gpg_version_string();
 909         if (gpgver == NULL || !strncmp(gpgver, "1.", 2)) {
 910                 debug_print("Using gpg 1.x, using builtin passphrase dialog.\n");
 911 again:
 912                 passphrase = passphrase_mbox(tmp, NULL, prev_bad, 1);
 913                 if (passphrase == NULL) {
 914                         g_free(tmp);
 915                         g_free(email);
 916                         g_free(name);
 917                         return;
 918                 }
 919                 passphrase_second = passphrase_mbox(tmp, NULL, 0, 2);
 920                 if (passphrase_second == NULL) {
 921                         g_free(tmp);
 922                         g_free(email);
 923                         if (passphrase != NULL) {
 924                                 memset(passphrase, 0, strlen(passphrase));
 925                                 g_free(passphrase);
 926                         }
 927                         g_free(name);
 928                         return;
 929                 }
 930                 if (strcmp(passphrase, passphrase_second)) {
 931                         if (passphrase != NULL) {
 932                                 memset(passphrase, 0, strlen(passphrase));
 933                                 g_free(passphrase);
 934                         }
 935                         if (passphrase_second != NULL) {
 936                                 memset(passphrase_second, 0, strlen(passphrase_second));
 937                                 g_free(passphrase_second);
 938                         }
 939                         prev_bad = 1;
 940                         goto again;
 941                 }
 942         }
 943
 944         key_parms = g_strdup_printf("<GnupgKeyParms format=\"internal\">\n"
 945                                         "Key-Type: RSA\n"
 946                                         "Key-Length: 2048\n"
 947                                         "Subkey-Type: RSA\n"
 948                                         "Subkey-Length: 2048\n"
 949                                         "Name-Real: %s\n"
 950                                         "Name-Email: %s\n"
 951                                         "Expire-Date: 0\n"
 952                                         "%s%s%s"
 953                                         "</GnupgKeyParms>\n",
 954                                         name, email,
 955                                         passphrase?"Passphrase: ":"",
 956                                         passphrase?passphrase:"",
 957                                         passphrase?"\n":"");
 958 #ifndef G_PLATFORM_WIN32
 959         if (passphrase &&
 960                         mlock(passphrase, strlen(passphrase)) == -1)
 961                 debug_print("couldn't lock passphrase\n");
 962         if (passphrase_second &&
 963                         mlock(passphrase_second, strlen(passphrase_second)) == -1)
 964                 debug_print("couldn't lock passphrase2\n");
 965 #endif
 966         g_free(tmp);
 967         g_free(email);
 968         g_free(name);
 969         if (passphrase_second != NULL) {
 970                 memset(passphrase_second, 0, strlen(passphrase_second));
 971                 g_free(passphrase_second);
 972         }
 973         if (passphrase != NULL) {
 974                 memset(passphrase, 0, strlen(passphrase));
 975                 g_free(passphrase);
 976         }
 977
 978         err = gpgme_new (&ctx);
 979         if (err) {
 980                 alertpanel_error(_("Couldn't generate a new key pair: %s"),
 981                                  gpgme_strerror(err));
 982                 if (key_parms != NULL) {
 983                         memset(key_parms, 0, strlen(key_parms));
 984                         g_free(key_parms);
 985                 }
 986                 return;
 987         }
 988
 989
 990         window = label_window_create(_("Generating your new key pair... Please move the mouse "
 991                               "around to help generate entropy..."));
 992
 993         err = gpgme_op_genkey(ctx, key_parms, NULL, NULL);
 994         if (key_parms != NULL) {
 995                 memset(key_parms, 0, strlen(key_parms));
 996                 g_free(key_parms);
 997         }
 998
 999         label_window_destroy(window);
1000
1001         if (err) {
1002                 alertpanel_error(_("Couldn't generate a new key pair: %s"), gpgme_strerror(err));
1003                 gpgme_release(ctx);
1004                 return;
1005         }
1006         key = gpgme_op_genkey_result(ctx);
1007         if (key == NULL) {
1008                 alertpanel_error(_("Couldn't generate a new key pair: unknown error"));
1009                 gpgme_release(ctx);
1010                 return;
1011         } else {
1012                 gchar *buf = g_strdup_printf(_("Your new key pair has been generated. "
1013                                     "Its fingerprint is:\n%s\n\nDo you want to export it "
1014                                     "to a keyserver?"),
1015                                     key->fpr ? key->fpr:"null");
1016                 AlertValue val = alertpanel(_("Key generated"), buf,
1017                                   GTK_STOCK_NO, GTK_STOCK_YES, NULL, ALERTFOCUS_SECOND);
1018                 g_free(buf);
1019                 if (val == G_ALERTALTERNATE) {
1020                         gchar *gpgbin = get_gpg_executable_name();
1021                         gchar *cmd = g_strdup_printf("\"%s\" --batch --no-tty --send-keys %s",
1022                                 (gpgbin ? gpgbin : "gpg"), key->fpr);
1023                         debug_print("Executing command: %s\n", cmd);
1024
1025 #ifndef G_OS_WIN32
1026                         int res = 0;
1027                         pid_t pid = 0;
1028                         pid = fork();
1029                         if (pid == -1) {
1030                                 res = -1;
1031                         } else if (pid == 0) {
1032                                 /* son */
1033                                 res = system(cmd);
1034                                 res = WEXITSTATUS(res);
1035                                 _exit(res);
1036                         } else {
1037                                 int status = 0;
1038                                 time_t start_wait = time(NULL);
1039                                 res = -1;
1040                                 do {
1041                                         if (waitpid(pid, &status, WNOHANG) == 0 || !WIFEXITED(status)) {
1042                                                 usleep(200000);
1043                                         } else {
1044                                                 res = WEXITSTATUS(status);
1045                                                 break;
1046                                         }
1047                                         if (time(NULL) - start_wait > 5) {
1048                                                 debug_print("SIGTERM'ing gpg\n");
1049                                                 kill(pid, SIGTERM);
1050                                         }
1051                                         if (time(NULL) - start_wait > 6) {
1052                                                 debug_print("SIGKILL'ing gpg\n");
1053                                                 kill(pid, SIGKILL);
1054                                                 break;
1055                                         }
1056                                 } while(1);
1057                         }
1058
1059                         if (res == 0)
1060                                 exported = TRUE;
1061 #else
1062                         /* We need to call gpg in a separate thread, so that waiting for
1063                          * it to finish does not block the UI. */
1064                         pthread_t pt;
1065                         struct _ExportCtx *ectx = malloc(sizeof(struct _ExportCtx));
1066
1067                         ectx->done = FALSE;
1068                         ectx->exitcode = STILL_ACTIVE;
1069                         ectx->cmd = cmd;
1070
1071                         if (pthread_create(&pt, NULL,
1072                                                 _export_threaded, (void *)ectx) != 0) {
1073                                 debug_print("Couldn't create thread, continuing unthreaded.\n");
1074                                 _export_threaded(ctx);
1075                         } else {
1076                                 debug_print("Thread created, waiting for it to finish...\n");
1077                                 while (!ectx->done)
1078                                         claws_do_idle();
1079                         }
1080
1081                         debug_print("Thread finished.\n");
1082                         pthread_join(pt, NULL);
1083
1084                         if (ectx->exitcode == 0)
1085                                 exported = TRUE;
1086
1087                         g_free(ectx);
1088 #endif
1089                         g_free(cmd);
1090
1091                         if (exported) {
1092                                 alertpanel_notice(_("Key exported."));
1093                         } else {
1094                                 alertpanel_error(_("Couldn't export key."));
1095                         }
1096                 }
1097         }
1098         gpgme_release(ctx);
1099 }
1100
1101 gboolean sgpgme_has_secret_key(void)
1102 {
1103         gpgme_error_t err = 0;
1104         gpgme_ctx_t ctx;
1105         gpgme_key_t key;
1106
1107         err = gpgme_new (&ctx);
1108         if (err) {
1109                 debug_print("err : %s\n", gpgme_strerror(err));
1110                 return TRUE;
1111         }
1112 check_again:
1113         err = gpgme_op_keylist_start(ctx, NULL, TRUE);
1114         if (!err) {
1115                 err = gpgme_op_keylist_next(ctx, &key);
1116                 gpgme_key_unref(key); /* We're not interested in the key itself. */
1117         }
1118         gpgme_op_keylist_end(ctx);
1119         if (gpg_err_code(err) == GPG_ERR_EOF) {
1120                 if (gpgme_get_protocol(ctx) != GPGME_PROTOCOL_CMS) {
1121                         gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
1122                         goto check_again;
1123                 }
1124                 gpgme_release(ctx);
1125                 return FALSE;
1126         } else {
1127                 gpgme_release(ctx);
1128                 return TRUE;
1129         }
1130 }
1131
1132 void sgpgme_check_create_key(void)
1133 {
1134         if (prefs_gpg_get_config()->gpg_ask_create_key &&
1135             !sgpgme_has_secret_key()) {
1136                 sgpgme_create_secret_key(NULL, TRUE);
1137         }
1138
1139         prefs_gpg_get_config()->gpg_ask_create_key = FALSE;
1140         prefs_gpg_save_config();
1141 }
1142
1143 void *sgpgme_data_release_and_get_mem(gpgme_data_t data, size_t *len)
1144 {
1145         char buf[BUFSIZ];
1146         void *result = NULL;
1147         ssize_t r = 0;
1148         size_t w = 0;
1149
1150         cm_return_val_if_fail(data != NULL, NULL);
1151         cm_return_val_if_fail(len != NULL, NULL);
1152
1153         /* I know it's deprecated, but we don't compile with _LARGEFILE */
1154         cm_gpgme_data_rewind(data);
1155         while ((r = gpgme_data_read(data, buf, BUFSIZ)) > 0) {
1156                 void *rresult = realloc(result, r + w);
1157                 if (rresult == NULL) {
1158                         g_warning("can't allocate memory");
1159                         if (result != NULL)
1160                                 free(result);
1161                         return NULL;
1162                 }
1163                 result = rresult;
1164                 memcpy(result+w, buf, r);
1165                 w += r;
1166         }
1167
1168         *len = w;
1169
1170         gpgme_data_release(data);
1171         if (r < 0) {
1172                 g_warning("gpgme_data_read() returned an error: %d", (int)r);
1173                 free(result);
1174                 *len = 0;
1175                 return NULL;
1176         }
1177         return result;
1178 }
1179
1180 gpgme_error_t cm_gpgme_data_rewind(gpgme_data_t dh)
1181 {
1182 #if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64
1183         if (gpgme_data_seek(dh, (off_t)0, SEEK_SET) == -1)
1184                 return gpg_error_from_errno(errno);
1185         else
1186                 return 0;
1187 #else
1188         return gpgme_data_rewind(dh);
1189 #endif
1190 }
1191
1192 #endif /* USE_GPGME */