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