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         SignKeyType sk;
 576         gchar *skid;
 577         gboolean smime = FALSE;
 578
 579         gpgme_signers_clear(ctx);
 580
 581         if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_CMS)
 582                 smime = TRUE;
 583
 584         if (from_addr)
 585                 signer_addr = from_addr;
 586         config = prefs_gpg_account_get_config(account);
 587
 588         if(smime) {
 589                 debug_print("sgpgme_setup_signers: S/MIME protocol\n");
 590                 sk = config->smime_sign_key;
 591                 skid = config->smime_sign_key_id;
 592         } else {
 593                 debug_print("sgpgme_setup_signers: OpenPGP protocol\n");
 594                 sk = config->sign_key;
 595                 skid = config->sign_key_id;
 596         }
 597
 598         switch(sk) {
 599         case SIGN_KEY_DEFAULT:
 600                 debug_print("using default gnupg key\n");
 601                 break;
 602         case SIGN_KEY_BY_FROM:
 603                 debug_print("using key for %s\n", signer_addr);
 604                 break;
 605         case SIGN_KEY_CUSTOM:
 606                 debug_print("using key for %s\n", skid);
 607                 break;
 608         }
 609
 610         if (sk != SIGN_KEY_DEFAULT) {
 611                 const gchar *keyid;
 612                 gpgme_key_t key, found_key;
 613                 gpgme_error_t err;
 614
 615                 if (sk == SIGN_KEY_BY_FROM)
 616                         keyid = signer_addr;
 617                 else if (sk == SIGN_KEY_CUSTOM)
 618                         keyid = skid;
 619                 else
 620                         goto bail;
 621
 622                 found_key = NULL;
 623                 /* Look for any key, not just private ones, or GPGMe doesn't
 624                  * correctly set the revoked flag. */
 625                 err = gpgme_op_keylist_start(ctx, keyid, 0);
 626                 while (err == 0) {
 627                         if ((err = gpgme_op_keylist_next(ctx, &key)) != 0)
 628                                 break;
 629
 630                         if (key == NULL)
 631                                 continue;
 632
 633                         if (!key->can_sign) {
 634                                 debug_print("skipping a key, can not be used for signing\n");
 635                                 gpgme_key_unref(key);
 636                                 continue;
 637                         }
 638
 639                         if (key->protocol != gpgme_get_protocol(ctx)) {
 640                                 debug_print("skipping a key (wrong protocol %d)\n", key->protocol);
 641                                 gpgme_key_unref(key);
 642                                 continue;
 643                         }
 644
 645                         if (key->expired) {
 646                                 debug_print("skipping a key, expired\n");
 647                                 gpgme_key_unref(key);
 648                                 continue;
 649                         }
 650                         if (key->revoked) {
 651                                 debug_print("skipping a key, revoked\n");
 652                                 gpgme_key_unref(key);
 653                                 continue;
 654                         }
 655                         if (key->disabled) {
 656                                 debug_print("skipping a key, disabled\n");
 657                                 gpgme_key_unref(key);
 658                                 continue;
 659                         }
 660
 661                         if (found_key != NULL) {
 662                                 gpgme_key_unref(key);
 663                                 gpgme_op_keylist_end(ctx);
 664                                 g_warning("ambiguous specification of secret key '%s'", keyid);
 665                                 privacy_set_error(_("Secret key specification is ambiguous"));
 666                                 goto bail;
 667                         }
 668
 669                         found_key = key;
 670                 }
 671                 gpgme_op_keylist_end(ctx);
 672
 673                 if (found_key == NULL) {
 674                         g_warning("setup_signers start: %s", gpgme_strerror(err));
 675                         privacy_set_error(_("Secret key not found (%s)"), gpgme_strerror(err));
 676                         goto bail;
 677                 }
 678
 679                 err = gpgme_signers_add(ctx, found_key);
 680                 debug_print("got key (proto %d (pgp %d, smime %d).\n",
 681                             found_key->protocol, GPGME_PROTOCOL_OpenPGP,
 682                             GPGME_PROTOCOL_CMS);
 683                 gpgme_key_unref(found_key);
 684
 685                 if (err) {
 686                         g_warning("error adding secret key: %s",
 687                                   gpgme_strerror(err));
 688                         privacy_set_error(_("Error setting secret key: %s"),
 689                                           gpgme_strerror(err));
 690                         goto bail;
 691                 }
 692         }
 693
 694         prefs_gpg_account_free_config(config);
 695
 696         return TRUE;
 697 bail:
 698         prefs_gpg_account_free_config(config);
 699         return FALSE;
 700 }
 701
 702 void sgpgme_init()
 703 {
 704         gchar *ctype_locale = NULL, *messages_locale = NULL;
 705         gchar *ctype_utf8_locale = NULL, *messages_utf8_locale = NULL;
 706         gpgme_error_t err = 0;
 707
 708         gpgme_engine_info_t engineInfo;
 709
 710         if (strcmp(prefs_gpg_get_config()->gpg_path, "") != 0
 711             && access(prefs_gpg_get_config()->gpg_path, X_OK) != -1) {
 712                 err = gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP, prefs_gpg_get_config()->gpg_path, NULL);
 713                 if (err != GPG_ERR_NO_ERROR)
 714                         g_warning("failed to set crypto engine configuration: %s", gpgme_strerror(err));
 715         }
 716
 717         if (gpgme_check_version("1.0.0")) {
 718 #ifdef LC_CTYPE
 719                 debug_print("setting gpgme CTYPE locale\n");
 720 #ifdef G_OS_WIN32
 721                 ctype_locale = g_win32_getlocale();
 722 #else
 723                 ctype_locale = g_strdup(setlocale(LC_CTYPE, NULL));
 724 #endif
 725                 if (ctype_locale) {
 726                         debug_print("setting gpgme CTYPE locale to: %s\n", ctype_locale);
 727                         if (strchr(ctype_locale, '.'))
 728                                 *(strchr(ctype_locale, '.')) = '\0';
 729                         else if (strchr(ctype_locale, '@'))
 730                                 *(strchr(ctype_locale, '@')) = '\0';
 731                         ctype_utf8_locale = g_strconcat(ctype_locale, ".UTF-8", NULL);
 732
 733                         debug_print("setting gpgme locale to UTF8: %s\n", ctype_utf8_locale ? ctype_utf8_locale : "NULL");
 734                         gpgme_set_locale(NULL, LC_CTYPE, ctype_utf8_locale);
 735
 736                         debug_print("done\n");
 737                         g_free(ctype_utf8_locale);
 738                         g_free(ctype_locale);
 739                 } else {
 740                         debug_print("couldn't set gpgme CTYPE locale\n");
 741                 }
 742 #endif
 743 #ifdef LC_MESSAGES
 744                 debug_print("setting gpgme MESSAGES locale\n");
 745 #ifdef G_OS_WIN32
 746                 messages_locale = g_win32_getlocale();
 747 #else
 748                 messages_locale = g_strdup(setlocale(LC_MESSAGES, NULL));
 749 #endif
 750                 if (messages_locale) {
 751                         debug_print("setting gpgme MESSAGES locale to: %s\n", messages_locale);
 752                         if (strchr(messages_locale, '.'))
 753                                 *(strchr(messages_locale, '.')) = '\0';
 754                         else if (strchr(messages_locale, '@'))
 755                                 *(strchr(messages_locale, '@')) = '\0';
 756                         messages_utf8_locale = g_strconcat(messages_locale, ".UTF-8", NULL);
 757                         debug_print("setting gpgme locale to UTF8: %s\n", messages_utf8_locale ? messages_utf8_locale : "NULL");
 758
 759                         gpgme_set_locale(NULL, LC_MESSAGES, messages_utf8_locale);
 760
 761                         debug_print("done\n");
 762                         g_free(messages_utf8_locale);
 763                         g_free(messages_locale);
 764                 } else {
 765                         debug_print("couldn't set gpgme MESSAGES locale\n");
 766                 }
 767 #endif
 768                 if (!gpgme_get_engine_info(&engineInfo)) {
 769                         while (engineInfo) {
 770                                 debug_print("GpgME Protocol: %s\n"
 771                                             "Version: %s (req %s)\n"
 772                                             "Executable: %s\n",
 773                                         gpgme_get_protocol_name(engineInfo->protocol) ? gpgme_get_protocol_name(engineInfo->protocol):"???",
 774                                         engineInfo->version ? engineInfo->version:"???",
 775                                         engineInfo->req_version ? engineInfo->req_version:"???",
 776                                         engineInfo->file_name ? engineInfo->file_name:"???");
 777                                 if (engineInfo->protocol == GPGME_PROTOCOL_OpenPGP
 778                                 &&  gpgme_engine_check_version(engineInfo->protocol) !=
 779                                         GPG_ERR_NO_ERROR) {
 780                                         if (engineInfo->file_name && !engineInfo->version) {
 781                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable: "
 782                                                                    "Engine '%s' isn't installed properly."),
 783                                                                    gpgme_get_protocol_name(engineInfo->protocol),
 784                                                                    engineInfo->file_name);
 785                                         } else if (engineInfo->file_name && engineInfo->version
 786                                           && engineInfo->req_version) {
 787                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable: "
 788                                                                    "Engine '%s' version %s is installed, "
 789                                                                    "but version %s is required.\n"),
 790                                                                    gpgme_get_protocol_name(engineInfo->protocol),
 791                                                                    engineInfo->file_name,
 792                                                                    engineInfo->version,
 793                                                                    engineInfo->req_version);
 794                                         } else {
 795                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable "
 796                                                                    "(unknown problem)"),
 797                                                                    gpgme_get_protocol_name(engineInfo->protocol));
 798                                         }
 799                                 }
 800                                 engineInfo = engineInfo->next;
 801                         }
 802                 }
 803         } else {
 804                 sgpgme_disable_all();
 805
 806                 if (prefs_gpg_get_config()->gpg_warning) {
 807                         AlertValue val;
 808
 809                         val = alertpanel_full
 810                                 (_("Warning"),
 811                                  _("GnuPG is not installed properly, or needs "
 812                                  "to be upgraded.\n"
 813                                  "OpenPGP support disabled."),
 814                                  GTK_STOCK_CLOSE, NULL, NULL, TRUE, NULL,
 815                                  ALERT_WARNING, G_ALERTDEFAULT);
 816                         if (val & G_ALERTDISABLE)
 817                                 prefs_gpg_get_config()->gpg_warning = FALSE;
 818                 }
 819         }
 820 }
 821
 822 void sgpgme_done()
 823 {
 824         gpgmegtk_free_passphrase();
 825 }
 826
 827 #ifdef G_OS_WIN32
 828 struct _ExportCtx {
 829         gboolean done;
 830         gchar *cmd;
 831         DWORD exitcode;
 832 };
 833
 834 static void *_export_threaded(void *arg)
 835 {
 836         struct _ExportCtx *ctx = (struct _ExportCtx *)arg;
 837         gboolean result;
 838
 839         PROCESS_INFORMATION pi = {0};
 840         STARTUPINFO si = {0};
 841
 842         result = CreateProcess(NULL, ctx->cmd, NULL, NULL, FALSE,
 843                         NORMAL_PRIORITY_CLASS | CREATE_NO_WINDOW,
 844                         NULL, NULL, &si, &pi);
 845
 846         if (!result) {
 847                 debug_print("Couldn't execute '%s'\n", ctx->cmd);
 848         } else {
 849                 WaitForSingleObject(pi.hProcess, 10000);
 850                 result = GetExitCodeProcess(pi.hProcess, &ctx->exitcode);
 851                 if (ctx->exitcode == STILL_ACTIVE) {
 852                         debug_print("Process still running, terminating it.\n");
 853                         TerminateProcess(pi.hProcess, 255);
 854                 }
 855
 856                 CloseHandle(pi.hProcess);
 857                 CloseHandle(pi.hThread);
 858
 859                 if (!result) {
 860                         debug_print("Process executed, but we couldn't get its exit code (huh?)\n");
 861                 }
 862         }
 863
 864         ctx->done = TRUE;
 865         return NULL;
 866 }
 867 #endif
 868
 869 void sgpgme_create_secret_key(PrefsAccount *account, gboolean ask_create)
 870 {
 871         AlertValue val = G_ALERTDEFAULT;
 872         gchar *key_parms = NULL;
 873         gchar *name = NULL;
 874         gchar *email = NULL;
 875         gchar *passphrase = NULL, *passphrase_second = NULL;
 876         gint prev_bad = 0;
 877         gchar *tmp = NULL, *gpgver;
 878         gpgme_error_t err = 0;
 879         gpgme_ctx_t ctx;
 880         GtkWidget *window = NULL;
 881         gpgme_genkey_result_t key;
 882         gboolean exported = FALSE;
 883
 884         if (account == NULL)
 885                 account = account_get_default();
 886
 887         if (account->address == NULL) {
 888                 alertpanel_error(_("You have to save the account's information with \"OK\" "
 889                                    "before being able to generate a key pair.\n"));
 890                 return;
 891         }
 892         if (ask_create) {
 893                 val = alertpanel(_("No PGP key found"),
 894                                 _("Claws Mail did not find a secret PGP key, "
 895                                   "which means that you won't be able to sign "
 896                                   "emails or receive encrypted emails.\n"
 897                                   "Do you want to create a new key pair now?"),
 898                                   GTK_STOCK_NO, "+" GTK_STOCK_YES, NULL);
 899                 if (val == G_ALERTDEFAULT) {
 900                         return;
 901                 }
 902         }
 903
 904         if (account->name) {
 905                 name = g_strdup(account->name);
 906         } else {
 907                 name = g_strdup(account->address);
 908         }
 909         email = g_strdup(account->address);
 910         tmp = g_strdup_printf("%s <%s>", account->name?account->name:account->address, account->address);
 911         gpgver = get_gpg_version_string();
 912         if (gpgver == NULL || !strncmp(gpgver, "1.", 2)) {
 913                 debug_print("Using gpg 1.x, using builtin passphrase dialog.\n");
 914 again:
 915                 passphrase = passphrase_mbox(tmp, NULL, prev_bad, 1);
 916                 if (passphrase == NULL) {
 917                         g_free(tmp);
 918                         g_free(email);
 919                         g_free(name);
 920                         return;
 921                 }
 922                 passphrase_second = passphrase_mbox(tmp, NULL, 0, 2);
 923                 if (passphrase_second == NULL) {
 924                         g_free(tmp);
 925                         g_free(email);
 926                         if (passphrase != NULL) {
 927                                 memset(passphrase, 0, strlen(passphrase));
 928                                 g_free(passphrase);
 929                         }
 930                         g_free(name);
 931                         return;
 932                 }
 933                 if (strcmp(passphrase, passphrase_second)) {
 934                         if (passphrase != NULL) {
 935                                 memset(passphrase, 0, strlen(passphrase));
 936                                 g_free(passphrase);
 937                         }
 938                         if (passphrase_second != NULL) {
 939                                 memset(passphrase_second, 0, strlen(passphrase_second));
 940                                 g_free(passphrase_second);
 941                         }
 942                         prev_bad = 1;
 943                         goto again;
 944                 }
 945         }
 946
 947         key_parms = g_strdup_printf("<GnupgKeyParms format=\"internal\">\n"
 948                                         "Key-Type: RSA\n"
 949                                         "Key-Length: 2048\n"
 950                                         "Subkey-Type: RSA\n"
 951                                         "Subkey-Length: 2048\n"
 952                                         "Name-Real: %s\n"
 953                                         "Name-Email: %s\n"
 954                                         "Expire-Date: 0\n"
 955                                         "%s%s%s"
 956                                         "</GnupgKeyParms>\n",
 957                                         name, email,
 958                                         passphrase?"Passphrase: ":"",
 959                                         passphrase?passphrase:"",
 960                                         passphrase?"\n":"");
 961 #ifndef G_PLATFORM_WIN32
 962         if (passphrase &&
 963                         mlock(passphrase, strlen(passphrase)) == -1)
 964                 debug_print("couldn't lock passphrase\n");
 965         if (passphrase_second &&
 966                         mlock(passphrase_second, strlen(passphrase_second)) == -1)
 967                 debug_print("couldn't lock passphrase2\n");
 968 #endif
 969         g_free(tmp);
 970         g_free(email);
 971         g_free(name);
 972         if (passphrase_second != NULL) {
 973                 memset(passphrase_second, 0, strlen(passphrase_second));
 974                 g_free(passphrase_second);
 975         }
 976         if (passphrase != NULL) {
 977                 memset(passphrase, 0, strlen(passphrase));
 978                 g_free(passphrase);
 979         }
 980
 981         err = gpgme_new (&ctx);
 982         if (err) {
 983                 alertpanel_error(_("Couldn't generate a new key pair: %s"),
 984                                  gpgme_strerror(err));
 985                 if (key_parms != NULL) {
 986                         memset(key_parms, 0, strlen(key_parms));
 987                         g_free(key_parms);
 988                 }
 989                 return;
 990         }
 991
 992
 993         window = label_window_create(_("Generating your new key pair... Please move the mouse "
 994                               "around to help generate entropy..."));
 995
 996         err = gpgme_op_genkey(ctx, key_parms, NULL, NULL);
 997         if (key_parms != NULL) {
 998                 memset(key_parms, 0, strlen(key_parms));
 999                 g_free(key_parms);
1000         }
1001
1002         label_window_destroy(window);
1003
1004         if (err) {
1005                 alertpanel_error(_("Couldn't generate a new key pair: %s"), gpgme_strerror(err));
1006                 gpgme_release(ctx);
1007                 return;
1008         }
1009         key = gpgme_op_genkey_result(ctx);
1010         if (key == NULL) {
1011                 alertpanel_error(_("Couldn't generate a new key pair: unknown error"));
1012                 gpgme_release(ctx);
1013                 return;
1014         } else {
1015                 gchar *buf = g_strdup_printf(_("Your new key pair has been generated. "
1016                                     "Its fingerprint is:\n%s\n\nDo you want to export it "
1017                                     "to a keyserver?"),
1018                                     key->fpr ? key->fpr:"null");
1019                 AlertValue val = alertpanel(_("Key generated"), buf,
1020                                   GTK_STOCK_NO, "+" GTK_STOCK_YES, NULL);
1021                 g_free(buf);
1022                 if (val == G_ALERTALTERNATE) {
1023                         gchar *gpgbin = get_gpg_executable_name();
1024                         gchar *cmd = g_strdup_printf("\"%s\" --batch --no-tty --send-keys %s",
1025                                 (gpgbin ? gpgbin : "gpg"), key->fpr);
1026                         debug_print("Executing command: %s\n", cmd);
1027
1028 #ifndef G_OS_WIN32
1029                         int res = 0;
1030                         pid_t pid = 0;
1031                         pid = fork();
1032                         if (pid == -1) {
1033                                 res = -1;
1034                         } else if (pid == 0) {
1035                                 /* son */
1036                                 res = system(cmd);
1037                                 res = WEXITSTATUS(res);
1038                                 _exit(res);
1039                         } else {
1040                                 int status = 0;
1041                                 time_t start_wait = time(NULL);
1042                                 res = -1;
1043                                 do {
1044                                         if (waitpid(pid, &status, WNOHANG) == 0 || !WIFEXITED(status)) {
1045                                                 usleep(200000);
1046                                         } else {
1047                                                 res = WEXITSTATUS(status);
1048                                                 break;
1049                                         }
1050                                         if (time(NULL) - start_wait > 5) {
1051                                                 debug_print("SIGTERM'ing gpg\n");
1052                                                 kill(pid, SIGTERM);
1053                                         }
1054                                         if (time(NULL) - start_wait > 6) {
1055                                                 debug_print("SIGKILL'ing gpg\n");
1056                                                 kill(pid, SIGKILL);
1057                                                 break;
1058                                         }
1059                                 } while(1);
1060                         }
1061
1062                         if (res == 0)
1063                                 exported = TRUE;
1064 #else
1065                         /* We need to call gpg in a separate thread, so that waiting for
1066                          * it to finish does not block the UI. */
1067                         pthread_t pt;
1068                         struct _ExportCtx *ectx = malloc(sizeof(struct _ExportCtx));
1069
1070                         ectx->done = FALSE;
1071                         ectx->exitcode = STILL_ACTIVE;
1072                         ectx->cmd = cmd;
1073
1074                         if (pthread_create(&pt, NULL,
1075                                                 _export_threaded, (void *)ectx) != 0) {
1076                                 debug_print("Couldn't create thread, continuing unthreaded.\n");
1077                                 _export_threaded(ctx);
1078                         } else {
1079                                 debug_print("Thread created, waiting for it to finish...\n");
1080                                 while (!ectx->done)
1081                                         claws_do_idle();
1082                         }
1083
1084                         debug_print("Thread finished.\n");
1085                         pthread_join(pt, NULL);
1086
1087                         if (ectx->exitcode == 0)
1088                                 exported = TRUE;
1089
1090                         g_free(ectx);
1091 #endif
1092                         g_free(cmd);
1093
1094                         if (exported) {
1095                                 alertpanel_notice(_("Key exported."));
1096                         } else {
1097                                 alertpanel_error(_("Couldn't export key."));
1098                         }
1099                 }
1100         }
1101         gpgme_release(ctx);
1102 }
1103
1104 gboolean sgpgme_has_secret_key(void)
1105 {
1106         gpgme_error_t err = 0;
1107         gpgme_ctx_t ctx;
1108         gpgme_key_t key;
1109
1110         err = gpgme_new (&ctx);
1111         if (err) {
1112                 debug_print("err : %s\n", gpgme_strerror(err));
1113                 return TRUE;
1114         }
1115 check_again:
1116         err = gpgme_op_keylist_start(ctx, NULL, TRUE);
1117         if (!err) {
1118                 err = gpgme_op_keylist_next(ctx, &key);
1119                 gpgme_key_unref(key); /* We're not interested in the key itself. */
1120         }
1121         gpgme_op_keylist_end(ctx);
1122         if (gpg_err_code(err) == GPG_ERR_EOF) {
1123                 if (gpgme_get_protocol(ctx) != GPGME_PROTOCOL_CMS) {
1124                         gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
1125                         goto check_again;
1126                 }
1127                 gpgme_release(ctx);
1128                 return FALSE;
1129         } else {
1130                 gpgme_release(ctx);
1131                 return TRUE;
1132         }
1133 }
1134
1135 void sgpgme_check_create_key(void)
1136 {
1137         if (prefs_gpg_get_config()->gpg_ask_create_key &&
1138             !sgpgme_has_secret_key()) {
1139                 sgpgme_create_secret_key(NULL, TRUE);
1140         }
1141
1142         prefs_gpg_get_config()->gpg_ask_create_key = FALSE;
1143         prefs_gpg_save_config();
1144 }
1145
1146 void *sgpgme_data_release_and_get_mem(gpgme_data_t data, size_t *len)
1147 {
1148         char buf[BUFSIZ];
1149         void *result = NULL;
1150         ssize_t r = 0;
1151         size_t w = 0;
1152
1153         cm_return_val_if_fail(data != NULL, NULL);
1154         cm_return_val_if_fail(len != NULL, NULL);
1155
1156         /* I know it's deprecated, but we don't compile with _LARGEFILE */
1157         cm_gpgme_data_rewind(data);
1158         while ((r = gpgme_data_read(data, buf, BUFSIZ)) > 0) {
1159                 void *rresult = realloc(result, r + w);
1160                 if (rresult == NULL) {
1161                         g_warning("can't allocate memory");
1162                         if (result != NULL)
1163                                 free(result);
1164                         return NULL;
1165                 }
1166                 result = rresult;
1167                 memcpy(result+w, buf, r);
1168                 w += r;
1169         }
1170
1171         *len = w;
1172
1173         gpgme_data_release(data);
1174         if (r < 0) {
1175                 g_warning("gpgme_data_read() returned an error: %d", (int)r);
1176                 free(result);
1177                 *len = 0;
1178                 return NULL;
1179         }
1180         return result;
1181 }
1182
1183 gpgme_error_t cm_gpgme_data_rewind(gpgme_data_t dh)
1184 {
1185 #if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64
1186         if (gpgme_data_seek(dh, (off_t)0, SEEK_SET) == -1)
1187                 return gpg_error_from_errno(errno);
1188         else
1189                 return 0;
1190 #else
1191         return gpgme_data_rewind(dh);
1192 #endif
1193 }
1194
1195 #endif /* USE_GPGME */