src/plugins/pgpcore/sgpgme.c

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