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                                 result = g_strdup_printf(_("Key 0x%s not available to verify this signature"), sig->fpr);
 285                         }
 286                         break;
 287                }
 288                 break;
 289         case GPG_ERR_SIG_EXPIRED:
 290                 result = g_strdup_printf(_("Expired signature from \"%s\""), uname);
 291                 break;
 292         case GPG_ERR_KEY_EXPIRED:
 293                 result = g_strdup_printf(_("Good signature from \"%s\", but the key has expired"), uname);
 294                 break;
 295         case GPG_ERR_CERT_REVOKED:
 296                 result = g_strdup_printf(_("Good signature from \"%s\", but the key has been revoked"), uname);
 297                 break;
 298         case GPG_ERR_BAD_SIGNATURE:
 299                 result = g_strdup_printf(_("Bad signature from \"%s\""), uname);
 300                 break;
 301         case GPG_ERR_NO_PUBKEY: {
 302                 result = g_strdup_printf(_("Key 0x%s not available to verify this signature"), sig->fpr);
 303                 break;
 304                 }
 305         default:
 306                 result = g_strdup(_("The signature has not been checked"));
 307                 break;
 308         }
 309         if (result == NULL)
 310                 result = g_strdup(_("Error"));
 311         g_free(uname);
 312         return result;
 313 }
 314
 315 gchar *sgpgme_sigstat_info_full(gpgme_ctx_t ctx, gpgme_verify_result_t status)
 316 {
 317         gint i = 0;
 318         gchar *ret;
 319         GString *siginfo;
 320         gpgme_signature_t sig = NULL;
 321
 322         siginfo = g_string_sized_new(64);
 323         if (status == NULL) {
 324                 g_string_append_printf(siginfo,
 325                         _("Error checking signature: no status\n"));
 326                 goto bail;
 327          }
 328
 329         sig = status->signatures;
 330
 331         while (sig) {
 332                 char buf[100];
 333                 struct tm lt;
 334                 gpgme_key_t key;
 335                 gpgme_error_t err;
 336                 const gchar *keytype, *keyid, *uid;
 337
 338                 err = gpgme_get_key(ctx, sig->fpr, &key, 0);
 339
 340                 if (err != GPG_ERR_NO_ERROR) {
 341                         key = NULL;
 342                         g_string_append_printf(siginfo,
 343                                 _("Error checking signature: %s\n"),
 344                                 gpgme_strerror(err));
 345                         goto bail;
 346                 }
 347                 if (key) {
 348                         keytype = gpgme_pubkey_algo_name(
 349                                         key->subkeys->pubkey_algo);
 350                         keyid = key->subkeys->keyid;
 351                         uid = key->uids->uid;
 352                 } else {
 353                         keytype = "?";
 354                         keyid = "?";
 355                         uid = "?";
 356                 }
 357
 358                 memset(buf, 0, sizeof(buf));
 359                 fast_strftime(buf, sizeof(buf)-1, prefs_common_get_prefs()->date_format, localtime_r(&sig->timestamp, &lt));
 360                 g_string_append_printf(siginfo,
 361                         _("Signature made on %s using %s key ID %s\n"),
 362                         buf, keytype, keyid);
 363
 364                 switch (gpg_err_code(sig->status)) {
 365                 case GPG_ERR_NO_ERROR:
 366                         g_string_append_printf(siginfo,
 367                                 _("Good signature from uid \"%s\" (Validity: %s)\n"),
 368                                 uid, get_validity_str((key && key->uids) ? key->uids->validity:GPGME_VALIDITY_UNKNOWN));
 369                         break;
 370                 case GPG_ERR_KEY_EXPIRED:
 371                         g_string_append_printf(siginfo,
 372                                 _("Expired key uid \"%s\"\n"),
 373                                 uid);
 374                         break;
 375                 case GPG_ERR_SIG_EXPIRED:
 376                         g_string_append_printf(siginfo,
 377                                 _("Expired signature from uid \"%s\" (Validity: %s)\n"),
 378                                 uid, get_validity_str((key && key->uids) ? key->uids->validity:GPGME_VALIDITY_UNKNOWN));
 379                         break;
 380                 case GPG_ERR_CERT_REVOKED:
 381                         g_string_append_printf(siginfo,
 382                                 _("Revoked key uid \"%s\"\n"),
 383                                 uid);
 384                         break;
 385                 case GPG_ERR_BAD_SIGNATURE:
 386                         g_string_append_printf(siginfo,
 387                                 _("BAD signature from \"%s\"\n"),
 388                                 uid);
 389                         break;
 390                 default:
 391                         break;
 392                 }
 393                 if (sig->status != GPG_ERR_BAD_SIGNATURE) {
 394                         gint j = 1;
 395                         if (key) {
 396                                 key->uids = key->uids ? key->uids->next : NULL;
 397                                 while (key->uids != NULL) {
 398                                         g_string_append_printf(siginfo,
 399                                                 g_strconcat("                    ",
 400                                                             _("uid \"%s\" (Validity: %s)\n"), NULL),
 401                                                 key->uids->uid,
 402                                                 key->uids->revoked==TRUE?_("Revoked"):get_validity_str(key->uids->validity));
 403                                         j++;
 404                                         key->uids = key->uids->next;
 405                                 }
 406                         }
 407                         g_string_append_printf(siginfo,_("Owner Trust: %s\n"),
 408                                                key ? get_owner_trust_str(key->owner_trust) : _("No key!"));
 409                         g_string_append(siginfo,
 410                                 _("Primary key fingerprint:"));
 411                         const char* primary_fpr = NULL;
 412                         if (key && key->subkeys && key->subkeys->fpr)
 413                                 primary_fpr = key->subkeys->fpr;
 414                         else
 415                                 g_string_append(siginfo, " ?");
 416                         int idx; /* now pretty-print the fingerprint */
 417                         for (idx=0; primary_fpr && *primary_fpr!='\0'; idx++, primary_fpr++) {
 418                                 if (idx%4==0)
 419                                         g_string_append_c(siginfo, ' ');
 420                                 if (idx%20==0)
 421                                         g_string_append_c(siginfo, ' ');
 422                                 g_string_append_c(siginfo, (gchar)*primary_fpr);
 423                         }
 424                         g_string_append_c(siginfo, '\n');
 425 #ifdef HAVE_GPGME_PKA_TRUST
 426                         if (sig->pka_trust == 1 && sig->pka_address) {
 427                                 g_string_append_printf(siginfo,
 428                                    _("WARNING: Signer's address \"%s\" "
 429                                       "does not match DNS entry\n"),
 430                                    sig->pka_address);
 431                         }
 432                         else if (sig->pka_trust == 2 && sig->pka_address) {
 433                                 g_string_append_printf(siginfo,
 434                                    _("Verified signer's address is \"%s\"\n"),
 435                                    sig->pka_address);
 436                                 /* FIXME: Compare the address to the
 437                                  * From: address.  */
 438                         }
 439 #endif /*HAVE_GPGME_PKA_TRUST*/
 440                 }
 441
 442                 g_string_append(siginfo, "\n");
 443                 i++;
 444                 sig = sig->next;
 445         }
 446 bail:
 447         ret = siginfo->str;
 448         g_string_free(siginfo, FALSE);
 449         return ret;
 450 }
 451
 452 gpgme_data_t sgpgme_data_from_mimeinfo(MimeInfo *mimeinfo)
 453 {
 454         gpgme_data_t data = NULL;
 455         gpgme_error_t err;
 456         FILE *fp = g_fopen(mimeinfo->data.filename, "rb");
 457
 458         if (!fp)
 459                 return NULL;
 460
 461         err = gpgme_data_new_from_filepart(&data, NULL, fp, mimeinfo->offset, mimeinfo->length);
 462         fclose(fp);
 463
 464         debug_print("data %p (%d %d)\n", (void *)&data, mimeinfo->offset, mimeinfo->length);
 465         if (err) {
 466                 debug_print ("gpgme_data_new_from_file failed: %s\n",
 467                              gpgme_strerror (err));
 468                 privacy_set_error(_("Couldn't get data from message, %s"), gpgme_strerror(err));
 469                 return NULL;
 470         }
 471         return data;
 472 }
 473
 474 gpgme_data_t sgpgme_decrypt_verify(gpgme_data_t cipher, gpgme_verify_result_t *status, gpgme_ctx_t ctx)
 475 {
 476         struct passphrase_cb_info_s info;
 477         gpgme_data_t plain;
 478         gpgme_error_t err;
 479
 480         memset (&info, 0, sizeof info);
 481
 482         if ((err = gpgme_data_new(&plain)) != GPG_ERR_NO_ERROR) {
 483                 gpgme_release(ctx);
 484                 privacy_set_error(_("Couldn't initialize data, %s"), gpgme_strerror(err));
 485                 return NULL;
 486         }
 487
 488         if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 489                 prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
 490                 if (!g_getenv("GPG_AGENT_INFO") || !prefs_gpg_get_config()->use_gpg_agent) {
 491                         info.c = ctx;
 492                         gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 493                 }
 494         } else {
 495                 prefs_gpg_enable_agent(TRUE);
 496                 info.c = ctx;
 497                 gpgme_set_passphrase_cb (ctx, NULL, &info);
 498         }
 499
 500
 501         if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 502                 err = gpgme_op_decrypt_verify(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         } else {
 519                 err = gpgme_op_decrypt(ctx, cipher, plain);
 520                 if (err != GPG_ERR_NO_ERROR) {
 521                         debug_print("can't decrypt (%s)\n", gpgme_strerror(err));
 522                         privacy_set_error("%s", gpgme_strerror(err));
 523                         gpgmegtk_free_passphrase();
 524                         gpgme_data_release(plain);
 525                         return NULL;
 526                 }
 527
 528                 err = cm_gpgme_data_rewind(plain);
 529                 if (err) {
 530                         debug_print("can't seek (%d %d %s)\n", err, errno, g_strerror(errno));
 531                 }
 532
 533                 debug_print("decrypted.\n");
 534                 *status = gpgme_op_verify_result (ctx);
 535         }
 536         return plain;
 537 }
 538
 539 gchar *sgpgme_get_encrypt_data(GSList *recp_names, gpgme_protocol_t proto)
 540 {
 541         SelectionResult result = KEY_SELECTION_CANCEL;
 542         gpgme_key_t *keys = gpgmegtk_recipient_selection(recp_names, &result,
 543                                 proto);
 544         gchar *ret = NULL;
 545         int i = 0;
 546
 547         if (!keys) {
 548                 if (result == KEY_SELECTION_DONT)
 549                         return g_strdup("_DONT_ENCRYPT_");
 550                 else
 551                         return NULL;
 552         }
 553         while (keys[i]) {
 554                 gpgme_subkey_t skey = keys[i]->subkeys;
 555                 gchar *fpr = skey->fpr;
 556                 gchar *tmp = NULL;
 557                 debug_print("adding %s\n", fpr);
 558                 tmp = g_strconcat(ret?ret:"", fpr, " ", NULL);
 559                 g_free(ret);
 560                 ret = tmp;
 561                 i++;
 562         }
 563         return ret;
 564 }
 565
 566 gboolean sgpgme_setup_signers(gpgme_ctx_t ctx, PrefsAccount *account,
 567                               const gchar *from_addr)
 568 {
 569         GPGAccountConfig *config;
 570         const gchar *signer_addr = account->address;
 571         SignKeyType sk;
 572         gchar *skid;
 573         gboolean smime = FALSE;
 574
 575         gpgme_signers_clear(ctx);
 576
 577         if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_CMS)
 578                 smime = TRUE;
 579
 580         if (from_addr)
 581                 signer_addr = from_addr;
 582         config = prefs_gpg_account_get_config(account);
 583
 584         if(smime) {
 585                 debug_print("sgpgme_setup_signers: S/MIME protocol\n");
 586                 sk = config->smime_sign_key;
 587                 skid = config->smime_sign_key_id;
 588         } else {
 589                 debug_print("sgpgme_setup_signers: OpenPGP protocol\n");
 590                 sk = config->sign_key;
 591                 skid = config->sign_key_id;
 592         }
 593
 594         switch(sk) {
 595         case SIGN_KEY_DEFAULT:
 596                 debug_print("using default gnupg key\n");
 597                 break;
 598         case SIGN_KEY_BY_FROM:
 599                 debug_print("using key for %s\n", signer_addr);
 600                 break;
 601         case SIGN_KEY_CUSTOM:
 602                 debug_print("using key for %s\n", skid);
 603                 break;
 604         }
 605
 606         if (sk != SIGN_KEY_DEFAULT) {
 607                 const gchar *keyid;
 608                 gpgme_key_t key, found_key;
 609                 gpgme_error_t err;
 610
 611                 if (sk == SIGN_KEY_BY_FROM)
 612                         keyid = signer_addr;
 613                 else if (sk == SIGN_KEY_CUSTOM)
 614                         keyid = skid;
 615                 else
 616                         goto bail;
 617
 618                 found_key = NULL;
 619                 /* Look for any key, not just private ones, or GPGMe doesn't
 620                  * correctly set the revoked flag. */
 621                 err = gpgme_op_keylist_start(ctx, keyid, 0);
 622                 while (err == 0) {
 623                         if ((err = gpgme_op_keylist_next(ctx, &key)) != 0)
 624                                 break;
 625
 626                         if (key == NULL)
 627                                 continue;
 628
 629                         if (!key->can_sign) {
 630                                 debug_print("skipping a key, can not be used for signing\n");
 631                                 gpgme_key_unref(key);
 632                                 continue;
 633                         }
 634
 635                         if (key->protocol != gpgme_get_protocol(ctx)) {
 636                                 debug_print("skipping a key (wrong protocol %d)\n", key->protocol);
 637                                 gpgme_key_unref(key);
 638                                 continue;
 639                         }
 640
 641                         if (key->expired) {
 642                                 debug_print("skipping a key, expired\n");
 643                                 gpgme_key_unref(key);
 644                                 continue;
 645                         }
 646                         if (key->revoked) {
 647                                 debug_print("skipping a key, revoked\n");
 648                                 gpgme_key_unref(key);
 649                                 continue;
 650                         }
 651                         if (key->disabled) {
 652                                 debug_print("skipping a key, disabled\n");
 653                                 gpgme_key_unref(key);
 654                                 continue;
 655                         }
 656
 657                         if (found_key != NULL) {
 658                                 gpgme_key_unref(key);
 659                                 gpgme_op_keylist_end(ctx);
 660                                 g_warning("ambiguous specification of secret key '%s'", keyid);
 661                                 privacy_set_error(_("Secret key specification is ambiguous"));
 662                                 goto bail;
 663                         }
 664
 665                         found_key = key;
 666                 }
 667                 gpgme_op_keylist_end(ctx);
 668
 669                 if (found_key == NULL) {
 670                         g_warning("setup_signers start: %s", gpgme_strerror(err));
 671                         privacy_set_error(_("Secret key not found (%s)"), gpgme_strerror(err));
 672                         goto bail;
 673                 }
 674
 675                 err = gpgme_signers_add(ctx, found_key);
 676                 debug_print("got key (proto %d (pgp %d, smime %d).\n",
 677                             found_key->protocol, GPGME_PROTOCOL_OpenPGP,
 678                             GPGME_PROTOCOL_CMS);
 679                 gpgme_key_unref(found_key);
 680
 681                 if (err) {
 682                         g_warning("error adding secret key: %s",
 683                                   gpgme_strerror(err));
 684                         privacy_set_error(_("Error setting secret key: %s"),
 685                                           gpgme_strerror(err));
 686                         goto bail;
 687                 }
 688         }
 689
 690         prefs_gpg_account_free_config(config);
 691
 692         return TRUE;
 693 bail:
 694         prefs_gpg_account_free_config(config);
 695         return FALSE;
 696 }
 697
 698 void sgpgme_init()
 699 {
 700         gchar *ctype_locale = NULL, *messages_locale = NULL;
 701         gchar *ctype_utf8_locale = NULL, *messages_utf8_locale = NULL;
 702         gpgme_error_t err = 0;
 703
 704         gpgme_engine_info_t engineInfo;
 705
 706         if (strcmp(prefs_gpg_get_config()->gpg_path, "") != 0
 707             && access(prefs_gpg_get_config()->gpg_path, X_OK) != -1) {
 708                 err = gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP, prefs_gpg_get_config()->gpg_path, NULL);
 709                 if (err != GPG_ERR_NO_ERROR)
 710                         g_warning("failed to set crypto engine configuration: %s", gpgme_strerror(err));
 711         }
 712
 713         if (gpgme_check_version("1.0.0")) {
 714 #ifdef LC_CTYPE
 715                 debug_print("setting gpgme CTYPE locale\n");
 716 #ifdef G_OS_WIN32
 717                 ctype_locale = g_win32_getlocale();
 718 #else
 719                 ctype_locale = g_strdup(setlocale(LC_CTYPE, NULL));
 720 #endif
 721                 if (ctype_locale) {
 722                         debug_print("setting gpgme CTYPE locale to: %s\n", ctype_locale);
 723                         if (strchr(ctype_locale, '.'))
 724                                 *(strchr(ctype_locale, '.')) = '\0';
 725                         else if (strchr(ctype_locale, '@'))
 726                                 *(strchr(ctype_locale, '@')) = '\0';
 727                         ctype_utf8_locale = g_strconcat(ctype_locale, ".UTF-8", NULL);
 728
 729                         debug_print("setting gpgme locale to UTF8: %s\n", ctype_utf8_locale ? ctype_utf8_locale : "NULL");
 730                         gpgme_set_locale(NULL, LC_CTYPE, ctype_utf8_locale);
 731
 732                         debug_print("done\n");
 733                         g_free(ctype_utf8_locale);
 734                         g_free(ctype_locale);
 735                 } else {
 736                         debug_print("couldn't set gpgme CTYPE locale\n");
 737                 }
 738 #endif
 739 #ifdef LC_MESSAGES
 740                 debug_print("setting gpgme MESSAGES locale\n");
 741 #ifdef G_OS_WIN32
 742                 messages_locale = g_win32_getlocale();
 743 #else
 744                 messages_locale = g_strdup(setlocale(LC_MESSAGES, NULL));
 745 #endif
 746                 if (messages_locale) {
 747                         debug_print("setting gpgme MESSAGES locale to: %s\n", messages_locale);
 748                         if (strchr(messages_locale, '.'))
 749                                 *(strchr(messages_locale, '.')) = '\0';
 750                         else if (strchr(messages_locale, '@'))
 751                                 *(strchr(messages_locale, '@')) = '\0';
 752                         messages_utf8_locale = g_strconcat(messages_locale, ".UTF-8", NULL);
 753                         debug_print("setting gpgme locale to UTF8: %s\n", messages_utf8_locale ? messages_utf8_locale : "NULL");
 754
 755                         gpgme_set_locale(NULL, LC_MESSAGES, messages_utf8_locale);
 756
 757                         debug_print("done\n");
 758                         g_free(messages_utf8_locale);
 759                         g_free(messages_locale);
 760                 } else {
 761                         debug_print("couldn't set gpgme MESSAGES locale\n");
 762                 }
 763 #endif
 764                 if (!gpgme_get_engine_info(&engineInfo)) {
 765                         while (engineInfo) {
 766                                 debug_print("GpgME Protocol: %s\n"
 767                                             "Version: %s (req %s)\n"
 768                                             "Executable: %s\n",
 769                                         gpgme_get_protocol_name(engineInfo->protocol) ? gpgme_get_protocol_name(engineInfo->protocol):"???",
 770                                         engineInfo->version ? engineInfo->version:"???",
 771                                         engineInfo->req_version ? engineInfo->req_version:"???",
 772                                         engineInfo->file_name ? engineInfo->file_name:"???");
 773                                 if (engineInfo->protocol == GPGME_PROTOCOL_OpenPGP
 774                                 &&  gpgme_engine_check_version(engineInfo->protocol) !=
 775                                         GPG_ERR_NO_ERROR) {
 776                                         if (engineInfo->file_name && !engineInfo->version) {
 777                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable: "
 778                                                                    "Engine '%s' isn't installed properly."),
 779                                                                    gpgme_get_protocol_name(engineInfo->protocol),
 780                                                                    engineInfo->file_name);
 781                                         } else if (engineInfo->file_name && engineInfo->version
 782                                           && engineInfo->req_version) {
 783                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable: "
 784                                                                    "Engine '%s' version %s is installed, "
 785                                                                    "but version %s is required.\n"),
 786                                                                    gpgme_get_protocol_name(engineInfo->protocol),
 787                                                                    engineInfo->file_name,
 788                                                                    engineInfo->version,
 789                                                                    engineInfo->req_version);
 790                                         } else {
 791                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable "
 792                                                                    "(unknown problem)"),
 793                                                                    gpgme_get_protocol_name(engineInfo->protocol));
 794                                         }
 795                                 }
 796                                 engineInfo = engineInfo->next;
 797                         }
 798                 }
 799         } else {
 800                 sgpgme_disable_all();
 801
 802                 if (prefs_gpg_get_config()->gpg_warning) {
 803                         AlertValue val;
 804
 805                         val = alertpanel_full
 806                                 (_("Warning"),
 807                                  _("GnuPG is not installed properly, or needs "
 808                                  "to be upgraded.\n"
 809                                  "OpenPGP support disabled."),
 810                                  GTK_STOCK_CLOSE, NULL, NULL, ALERTFOCUS_FIRST, TRUE, NULL,
 811                                  ALERT_WARNING);
 812                         if (val & G_ALERTDISABLE)
 813                                 prefs_gpg_get_config()->gpg_warning = FALSE;
 814                 }
 815         }
 816 }
 817
 818 void sgpgme_done()
 819 {
 820         gpgmegtk_free_passphrase();
 821 }
 822
 823 #ifdef G_OS_WIN32
 824 struct _ExportCtx {
 825         gboolean done;
 826         gchar *cmd;
 827         DWORD exitcode;
 828 };
 829
 830 static void *_export_threaded(void *arg)
 831 {
 832         struct _ExportCtx *ctx = (struct _ExportCtx *)arg;
 833         gboolean result;
 834
 835         PROCESS_INFORMATION pi = {0};
 836         STARTUPINFO si = {0};
 837
 838         result = CreateProcess(NULL, ctx->cmd, NULL, NULL, FALSE,
 839                         NORMAL_PRIORITY_CLASS | CREATE_NO_WINDOW,
 840                         NULL, NULL, &si, &pi);
 841
 842         if (!result) {
 843                 debug_print("Couldn't execute '%s'\n", ctx->cmd);
 844         } else {
 845                 WaitForSingleObject(pi.hProcess, 10000);
 846                 result = GetExitCodeProcess(pi.hProcess, &ctx->exitcode);
 847                 if (ctx->exitcode == STILL_ACTIVE) {
 848                         debug_print("Process still running, terminating it.\n");
 849                         TerminateProcess(pi.hProcess, 255);
 850                 }
 851
 852                 CloseHandle(pi.hProcess);
 853                 CloseHandle(pi.hThread);
 854
 855                 if (!result) {
 856                         debug_print("Process executed, but we couldn't get its exit code (huh?)\n");
 857                 }
 858         }
 859
 860         ctx->done = TRUE;
 861         return NULL;
 862 }
 863 #endif
 864
 865 void sgpgme_create_secret_key(PrefsAccount *account, gboolean ask_create)
 866 {
 867         AlertValue val = G_ALERTDEFAULT;
 868         gchar *key_parms = NULL;
 869         gchar *name = NULL;
 870         gchar *email = NULL;
 871         gchar *passphrase = NULL, *passphrase_second = NULL;
 872         gint prev_bad = 0;
 873         gchar *tmp = NULL, *gpgver;
 874         gpgme_error_t err = 0;
 875         gpgme_ctx_t ctx;
 876         GtkWidget *window = NULL;
 877         gpgme_genkey_result_t key;
 878         gboolean exported = FALSE;
 879
 880         if (account == NULL)
 881                 account = account_get_default();
 882
 883         if (account->address == NULL) {
 884                 alertpanel_error(_("You have to save the account's information with \"OK\" "
 885                                    "before being able to generate a key pair.\n"));
 886                 return;
 887         }
 888         if (ask_create) {
 889                 val = alertpanel(_("No PGP key found"),
 890                                 _("Claws Mail did not find a secret PGP key, "
 891                                   "which means that you won't be able to sign "
 892                                   "emails or receive encrypted emails.\n"
 893                                   "Do you want to create a new key pair now?"),
 894                                   GTK_STOCK_NO, GTK_STOCK_YES, NULL, ALERTFOCUS_SECOND);
 895                 if (val == G_ALERTDEFAULT) {
 896                         return;
 897                 }
 898         }
 899
 900         if (account->name) {
 901                 name = g_strdup(account->name);
 902         } else {
 903                 name = g_strdup(account->address);
 904         }
 905         email = g_strdup(account->address);
 906         tmp = g_strdup_printf("%s <%s>", account->name?account->name:account->address, account->address);
 907         gpgver = get_gpg_version_string();
 908         if (gpgver == NULL || !strncmp(gpgver, "1.", 2)) {
 909                 debug_print("Using gpg 1.x, using builtin passphrase dialog.\n");
 910 again:
 911                 passphrase = passphrase_mbox(tmp, NULL, prev_bad, 1);
 912                 if (passphrase == NULL) {
 913                         g_free(tmp);
 914                         g_free(email);
 915                         g_free(name);
 916                         return;
 917                 }
 918                 passphrase_second = passphrase_mbox(tmp, NULL, 0, 2);
 919                 if (passphrase_second == NULL) {
 920                         g_free(tmp);
 921                         g_free(email);
 922                         if (passphrase != NULL) {
 923                                 memset(passphrase, 0, strlen(passphrase));
 924                                 g_free(passphrase);
 925                         }
 926                         g_free(name);
 927                         return;
 928                 }
 929                 if (strcmp(passphrase, passphrase_second)) {
 930                         if (passphrase != NULL) {
 931                                 memset(passphrase, 0, strlen(passphrase));
 932                                 g_free(passphrase);
 933                         }
 934                         if (passphrase_second != NULL) {
 935                                 memset(passphrase_second, 0, strlen(passphrase_second));
 936                                 g_free(passphrase_second);
 937                         }
 938                         prev_bad = 1;
 939                         goto again;
 940                 }
 941         }
 942
 943         key_parms = g_strdup_printf("<GnupgKeyParms format=\"internal\">\n"
 944                                         "Key-Type: RSA\n"
 945                                         "Key-Length: 2048\n"
 946                                         "Subkey-Type: RSA\n"
 947                                         "Subkey-Length: 2048\n"
 948                                         "Name-Real: %s\n"
 949                                         "Name-Email: %s\n"
 950                                         "Expire-Date: 0\n"
 951                                         "%s%s%s"
 952                                         "</GnupgKeyParms>\n",
 953                                         name, email,
 954                                         passphrase?"Passphrase: ":"",
 955                                         passphrase?passphrase:"",
 956                                         passphrase?"\n":"");
 957 #ifndef G_PLATFORM_WIN32
 958         if (passphrase &&
 959                         mlock(passphrase, strlen(passphrase)) == -1)
 960                 debug_print("couldn't lock passphrase\n");
 961         if (passphrase_second &&
 962                         mlock(passphrase_second, strlen(passphrase_second)) == -1)
 963                 debug_print("couldn't lock passphrase2\n");
 964 #endif
 965         g_free(tmp);
 966         g_free(email);
 967         g_free(name);
 968         if (passphrase_second != NULL) {
 969                 memset(passphrase_second, 0, strlen(passphrase_second));
 970                 g_free(passphrase_second);
 971         }
 972         if (passphrase != NULL) {
 973                 memset(passphrase, 0, strlen(passphrase));
 974                 g_free(passphrase);
 975         }
 976
 977         err = gpgme_new (&ctx);
 978         if (err) {
 979                 alertpanel_error(_("Couldn't generate a new key pair: %s"),
 980                                  gpgme_strerror(err));
 981                 if (key_parms != NULL) {
 982                         memset(key_parms, 0, strlen(key_parms));
 983                         g_free(key_parms);
 984                 }
 985                 return;
 986         }
 987
 988
 989         window = label_window_create(_("Generating your new key pair... Please move the mouse "
 990                               "around to help generate entropy..."));
 991
 992         err = gpgme_op_genkey(ctx, key_parms, NULL, NULL);
 993         if (key_parms != NULL) {
 994                 memset(key_parms, 0, strlen(key_parms));
 995                 g_free(key_parms);
 996         }
 997
 998         label_window_destroy(window);
 999
1000         if (err) {
1001                 alertpanel_error(_("Couldn't generate a new key pair: %s"), gpgme_strerror(err));
1002                 gpgme_release(ctx);
1003                 return;
1004         }
1005         key = gpgme_op_genkey_result(ctx);
1006         if (key == NULL) {
1007                 alertpanel_error(_("Couldn't generate a new key pair: unknown error"));
1008                 gpgme_release(ctx);
1009                 return;
1010         } else {
1011                 gchar *buf = g_strdup_printf(_("Your new key pair has been generated. "
1012                                     "Its fingerprint is:\n%s\n\nDo you want to export it "
1013                                     "to a keyserver?"),
1014                                     key->fpr ? key->fpr:"null");
1015                 AlertValue val = alertpanel(_("Key generated"), buf,
1016                                   GTK_STOCK_NO, GTK_STOCK_YES, NULL, ALERTFOCUS_SECOND);
1017                 g_free(buf);
1018                 if (val == G_ALERTALTERNATE) {
1019                         gchar *gpgbin = get_gpg_executable_name();
1020                         gchar *cmd = g_strdup_printf("\"%s\" --batch --no-tty --send-keys %s",
1021                                 (gpgbin ? gpgbin : "gpg"), key->fpr);
1022                         debug_print("Executing command: %s\n", cmd);
1023
1024 #ifndef G_OS_WIN32
1025                         int res = 0;
1026                         pid_t pid = 0;
1027                         pid = fork();
1028                         if (pid == -1) {
1029                                 res = -1;
1030                         } else if (pid == 0) {
1031                                 /* son */
1032                                 res = system(cmd);
1033                                 res = WEXITSTATUS(res);
1034                                 _exit(res);
1035                         } else {
1036                                 int status = 0;
1037                                 time_t start_wait = time(NULL);
1038                                 res = -1;
1039                                 do {
1040                                         if (waitpid(pid, &status, WNOHANG) == 0 || !WIFEXITED(status)) {
1041                                                 usleep(200000);
1042                                         } else {
1043                                                 res = WEXITSTATUS(status);
1044                                                 break;
1045                                         }
1046                                         if (time(NULL) - start_wait > 5) {
1047                                                 debug_print("SIGTERM'ing gpg\n");
1048                                                 kill(pid, SIGTERM);
1049                                         }
1050                                         if (time(NULL) - start_wait > 6) {
1051                                                 debug_print("SIGKILL'ing gpg\n");
1052                                                 kill(pid, SIGKILL);
1053                                                 break;
1054                                         }
1055                                 } while(1);
1056                         }
1057
1058                         if (res == 0)
1059                                 exported = TRUE;
1060 #else
1061                         /* We need to call gpg in a separate thread, so that waiting for
1062                          * it to finish does not block the UI. */
1063                         pthread_t pt;
1064                         struct _ExportCtx *ectx = malloc(sizeof(struct _ExportCtx));
1065
1066                         ectx->done = FALSE;
1067                         ectx->exitcode = STILL_ACTIVE;
1068                         ectx->cmd = cmd;
1069
1070                         if (pthread_create(&pt, NULL,
1071                                                 _export_threaded, (void *)ectx) != 0) {
1072                                 debug_print("Couldn't create thread, continuing unthreaded.\n");
1073                                 _export_threaded(ctx);
1074                         } else {
1075                                 debug_print("Thread created, waiting for it to finish...\n");
1076                                 while (!ectx->done)
1077                                         claws_do_idle();
1078                         }
1079
1080                         debug_print("Thread finished.\n");
1081                         pthread_join(pt, NULL);
1082
1083                         if (ectx->exitcode == 0)
1084                                 exported = TRUE;
1085
1086                         g_free(ectx);
1087 #endif
1088                         g_free(cmd);
1089
1090                         if (exported) {
1091                                 alertpanel_notice(_("Key exported."));
1092                         } else {
1093                                 alertpanel_error(_("Couldn't export key."));
1094                         }
1095                 }
1096         }
1097         gpgme_release(ctx);
1098 }
1099
1100 gboolean sgpgme_has_secret_key(void)
1101 {
1102         gpgme_error_t err = 0;
1103         gpgme_ctx_t ctx;
1104         gpgme_key_t key;
1105
1106         err = gpgme_new (&ctx);
1107         if (err) {
1108                 debug_print("err : %s\n", gpgme_strerror(err));
1109                 return TRUE;
1110         }
1111 check_again:
1112         err = gpgme_op_keylist_start(ctx, NULL, TRUE);
1113         if (!err) {
1114                 err = gpgme_op_keylist_next(ctx, &key);
1115                 gpgme_key_unref(key); /* We're not interested in the key itself. */
1116         }
1117         gpgme_op_keylist_end(ctx);
1118         if (gpg_err_code(err) == GPG_ERR_EOF) {
1119                 if (gpgme_get_protocol(ctx) != GPGME_PROTOCOL_CMS) {
1120                         gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
1121                         goto check_again;
1122                 }
1123                 gpgme_release(ctx);
1124                 return FALSE;
1125         } else {
1126                 gpgme_release(ctx);
1127                 return TRUE;
1128         }
1129 }
1130
1131 void sgpgme_check_create_key(void)
1132 {
1133         if (prefs_gpg_get_config()->gpg_ask_create_key &&
1134             !sgpgme_has_secret_key()) {
1135                 sgpgme_create_secret_key(NULL, TRUE);
1136         }
1137
1138         prefs_gpg_get_config()->gpg_ask_create_key = FALSE;
1139         prefs_gpg_save_config();
1140 }
1141
1142 void *sgpgme_data_release_and_get_mem(gpgme_data_t data, size_t *len)
1143 {
1144         char buf[BUFSIZ];
1145         void *result = NULL;
1146         ssize_t r = 0;
1147         size_t w = 0;
1148
1149         cm_return_val_if_fail(data != NULL, NULL);
1150         cm_return_val_if_fail(len != NULL, NULL);
1151
1152         /* I know it's deprecated, but we don't compile with _LARGEFILE */
1153         cm_gpgme_data_rewind(data);
1154         while ((r = gpgme_data_read(data, buf, BUFSIZ)) > 0) {
1155                 void *rresult = realloc(result, r + w);
1156                 if (rresult == NULL) {
1157                         g_warning("can't allocate memory");
1158                         if (result != NULL)
1159                                 free(result);
1160                         return NULL;
1161                 }
1162                 result = rresult;
1163                 memcpy(result+w, buf, r);
1164                 w += r;
1165         }
1166
1167         *len = w;
1168
1169         gpgme_data_release(data);
1170         if (r < 0) {
1171                 g_warning("gpgme_data_read() returned an error: %d", (int)r);
1172                 free(result);
1173                 *len = 0;
1174                 return NULL;
1175         }
1176         return result;
1177 }
1178
1179 gpgme_error_t cm_gpgme_data_rewind(gpgme_data_t dh)
1180 {
1181 #if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64
1182         if (gpgme_data_seek(dh, (off_t)0, SEEK_SET) == -1)
1183                 return gpg_error_from_errno(errno);
1184         else
1185                 return 0;
1186 #else
1187         return gpgme_data_rewind(dh);
1188 #endif
1189 }
1190
1191 #endif /* USE_GPGME */