src/plugins/pgpcore/sgpgme.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2016 the Claws Mail team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #  include "config.h"
  21 #include "claws-features.h"
  22 #endif
  23
  24 #ifdef USE_GPGME
  25
  26 #include <time.h>
  27 #include <gtk/gtk.h>
  28 #include <gpgme.h>
  29 #include <glib.h>
  30 #include <glib/gi18n.h>
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <stdlib.h>
  34 #include <errno.h>
  35 #include <sys/types.h>
  36 #ifndef G_OS_WIN32
  37 #  include <sys/wait.h>
  38 #else
  39 #  include <pthread.h>
  40 #  include <windows.h>
  41 #endif
  42 #if (defined(__DragonFly__) || defined(SOLARIS) || defined (__NetBSD__) || defined (__FreeBSD__) || defined (__OpenBSD__))
  43 #  include <sys/signal.h>
  44 #endif
  45 #ifndef G_OS_WIN32
  46 #include <sys/mman.h>
  47 #endif
  48 #if HAVE_LOCALE_H
  49 #  include <locale.h>
  50 #endif
  51
  52 #include "sgpgme.h"
  53 #include "privacy.h"
  54 #include "prefs_common.h"
  55 #include "utils.h"
  56 #include "alertpanel.h"
  57 #include "passphrase.h"
  58 #include "prefs_gpg.h"
  59 #include "account.h"
  60 #include "select-keys.h"
  61 #include "claws.h"
  62 #include "file-utils.h"
  63
  64 static void sgpgme_disable_all(void)
  65 {
  66     /* FIXME: set a flag, so that we don't bother the user with failed
  67      * gpgme messages */
  68 }
  69
  70 gpgme_verify_result_t sgpgme_verify_signature(gpgme_ctx_t ctx, gpgme_data_t sig,
  71                                         gpgme_data_t plain, gpgme_data_t dummy)
  72 {
  73         gpgme_verify_result_t status = NULL;
  74         gpgme_error_t err;
  75
  76         if ((err = gpgme_op_verify(ctx, sig, plain, dummy)) != GPG_ERR_NO_ERROR) {
  77                 debug_print("op_verify err %s\n", gpgme_strerror(err));
  78                 privacy_set_error("%s", gpgme_strerror(err));
  79                 return GINT_TO_POINTER(-GPG_ERR_SYSTEM_ERROR);
  80         }
  81         status = gpgme_op_verify_result(ctx);
  82         if (status && status->signatures == NULL) {
  83                 debug_print("no signature found\n");
  84                 privacy_set_error(_("No signature found"));
  85                 return GINT_TO_POINTER(-GPG_ERR_SYSTEM_ERROR);
  86         }
  87         return status;
  88 }
  89
  90 SignatureStatus sgpgme_sigstat_gpgme_to_privacy(gpgme_ctx_t ctx, gpgme_verify_result_t status)
  91 {
  92         gpgme_signature_t sig = NULL;
  93
  94         if (GPOINTER_TO_INT(status) == -GPG_ERR_SYSTEM_ERROR) {
  95                 debug_print("system error\n");
  96                 return SIGNATURE_CHECK_FAILED;
  97         }
  98
  99         if (status == NULL) {
 100                 debug_print("status == NULL\n");
 101                 return SIGNATURE_UNCHECKED;
 102         }
 103         sig = status->signatures;
 104
 105         if (sig == NULL) {
 106                 debug_print("sig == NULL\n");
 107                 return SIGNATURE_UNCHECKED;
 108         }
 109
 110         debug_print("err code %d\n", gpg_err_code(sig->status));
 111         switch (gpg_err_code(sig->status)) {
 112         case GPG_ERR_NO_ERROR:
 113                 switch (sig->validity) {
 114                 case GPGME_VALIDITY_NEVER:
 115                         return SIGNATURE_INVALID;
 116                 case GPGME_VALIDITY_UNKNOWN:
 117                 case GPGME_VALIDITY_UNDEFINED:
 118                 case GPGME_VALIDITY_MARGINAL:
 119                 case GPGME_VALIDITY_FULL:
 120                 case GPGME_VALIDITY_ULTIMATE:
 121                         return SIGNATURE_OK;
 122                 default:
 123                         return SIGNATURE_CHECK_FAILED;
 124                 }
 125         case GPG_ERR_SIG_EXPIRED:
 126         case GPG_ERR_CERT_REVOKED:
 127                 return SIGNATURE_WARN;
 128         case GPG_ERR_KEY_EXPIRED:
 129                 return SIGNATURE_KEY_EXPIRED;
 130         case GPG_ERR_BAD_SIGNATURE:
 131                 return SIGNATURE_INVALID;
 132         case GPG_ERR_NO_PUBKEY:
 133                 return SIGNATURE_CHECK_FAILED;
 134         default:
 135                 return SIGNATURE_CHECK_FAILED;
 136         }
 137         return SIGNATURE_CHECK_FAILED;
 138 }
 139
 140 static const gchar *get_validity_str(unsigned long validity)
 141 {
 142         switch (gpg_err_code(validity)) {
 143         case GPGME_VALIDITY_UNKNOWN:
 144                 return _("Unknown");
 145         case GPGME_VALIDITY_UNDEFINED:
 146                 return _("Undefined");
 147         case GPGME_VALIDITY_NEVER:
 148                 return _("Never");
 149         case GPGME_VALIDITY_MARGINAL:
 150                 return _("Marginal");
 151         case GPGME_VALIDITY_FULL:
 152                 return _("Full");
 153         case GPGME_VALIDITY_ULTIMATE:
 154                 return _("Ultimate");
 155         default:
 156                 return _("Error");
 157         }
 158 }
 159
 160 static const gchar *get_owner_trust_str(unsigned long owner_trust)
 161 {
 162         switch (gpgme_err_code(owner_trust)) {
 163         case GPGME_VALIDITY_NEVER:
 164                 return _("Untrusted");
 165         case GPGME_VALIDITY_MARGINAL:
 166                 return _("Marginal");
 167         case GPGME_VALIDITY_FULL:
 168                 return _("Full");
 169         case GPGME_VALIDITY_ULTIMATE:
 170                 return _("Ultimate");
 171         default:
 172                 return _("Unknown");
 173         }
 174 }
 175
 176 gchar *get_gpg_executable_name()
 177 {
 178         gpgme_engine_info_t e;
 179
 180         if (!gpgme_get_engine_info(&e)) {
 181                 while (e != NULL) {
 182                         if (e->protocol == GPGME_PROTOCOL_OpenPGP
 183                                         && e->file_name != NULL) {
 184                                 debug_print("Found gpg executable: '%s'\n", e->file_name);
 185                                 return e->file_name;
 186                         }
 187                 }
 188         }
 189
 190         return NULL;
 191 }
 192
 193 static gchar *get_gpg_version_string()
 194 {
 195         gpgme_engine_info_t e;
 196
 197         if (!gpgme_get_engine_info(&e)) {
 198                 while (e != NULL) {
 199                         if (e->protocol == GPGME_PROTOCOL_OpenPGP
 200                                         && e->version != NULL) {
 201                                 debug_print("Got OpenPGP version: '%s'\n", e->version);
 202                                 return e->version;
 203                         }
 204                 }
 205         }
 206
 207         return NULL;
 208 }
 209
 210 static gchar *extract_name(const char *uid)
 211 {
 212         if (uid == NULL)
 213                 return NULL;
 214         if (!strncmp(uid, "CN=", 3)) {
 215                 gchar *result = g_strdup(uid+3);
 216                 if (strstr(result, ","))
 217                         *(strstr(result, ",")) = '\0';
 218                 return result;
 219         } else if (strstr(uid, ",CN=")) {
 220                 gchar *result = g_strdup(strstr(uid, ",CN=")+4);
 221                 if (strstr(result, ","))
 222                         *(strstr(result, ",")) = '\0';
 223                 return result;
 224         } else {
 225                 return g_strdup(uid);
 226         }
 227 }
 228 gchar *sgpgme_sigstat_info_short(gpgme_ctx_t ctx, gpgme_verify_result_t status)
 229 {
 230         gpgme_signature_t sig = NULL;
 231         gchar *uname = NULL;
 232         gpgme_key_t key;
 233         gchar *result = NULL;
 234         gpgme_error_t err = 0;
 235         static gboolean warned = FALSE;
 236
 237         if (GPOINTER_TO_INT(status) == -GPG_ERR_SYSTEM_ERROR) {
 238                 return g_strdup_printf(_("The signature can't be checked - %s"), privacy_get_error());
 239         }
 240
 241         if (status == NULL) {
 242                 return g_strdup(_("The signature has not been checked."));
 243         }
 244         sig = status->signatures;
 245         if (sig == NULL) {
 246                 return g_strdup(_("The signature has not been checked."));
 247         }
 248
 249         err = gpgme_get_key(ctx, sig->fpr, &key, 0);
 250         if (gpg_err_code(err) == GPG_ERR_NO_AGENT) {
 251                 if (!warned)
 252                         alertpanel_error(_("PGP Core: Can't get key - no gpg-agent running."));
 253                 else
 254                         g_warning("PGP Core: Can't get key - no gpg-agent running.");
 255                 warned = TRUE;
 256         } else if (gpg_err_code(err) != GPG_ERR_NO_ERROR && gpg_err_code(err) != GPG_ERR_EOF) {
 257                 return g_strdup_printf(_("The signature can't be checked - %s"),
 258                         gpgme_strerror(err));
 259   }
 260
 261         if (key)
 262                 uname = extract_name(key->uids->uid);
 263         else
 264                 uname = g_strdup("<?>");
 265
 266         switch (gpg_err_code(sig->status)) {
 267         case GPG_ERR_NO_ERROR:
 268                switch ((key && key->uids) ? key->uids->validity : GPGME_VALIDITY_UNKNOWN) {
 269                 case GPGME_VALIDITY_ULTIMATE:
 270                         result = g_strdup_printf(_("Good signature from \"%s\" [ultimate]"), uname);
 271                         break;
 272                 case GPGME_VALIDITY_FULL:
 273                         result = g_strdup_printf(_("Good signature from \"%s\" [full]"), uname);
 274                         break;
 275                 case GPGME_VALIDITY_MARGINAL:
 276                         result = g_strdup_printf(_("Good signature from \"%s\" [marginal]"), uname);
 277                         break;
 278                 case GPGME_VALIDITY_UNKNOWN:
 279                 case GPGME_VALIDITY_UNDEFINED:
 280                 case GPGME_VALIDITY_NEVER:
 281                 default:
 282                         if (key) {
 283                                 result = g_strdup_printf(_("Good signature from \"%s\""), uname);
 284                         } else {
 285                                 result = g_strdup_printf(_("Key 0x%s not available to verify this signature"), sig->fpr);
 286                         }
 287                         break;
 288                }
 289                 break;
 290         case GPG_ERR_SIG_EXPIRED:
 291                 result = g_strdup_printf(_("Expired signature from \"%s\""), uname);
 292                 break;
 293         case GPG_ERR_KEY_EXPIRED:
 294                 result = g_strdup_printf(_("Good signature from \"%s\", but the key has expired"), uname);
 295                 break;
 296         case GPG_ERR_CERT_REVOKED:
 297                 result = g_strdup_printf(_("Good signature from \"%s\", but the key has been revoked"), uname);
 298                 break;
 299         case GPG_ERR_BAD_SIGNATURE:
 300                 result = g_strdup_printf(_("Bad signature from \"%s\""), uname);
 301                 break;
 302         case GPG_ERR_NO_PUBKEY: {
 303                 result = g_strdup_printf(_("Key 0x%s not available to verify this signature"), sig->fpr);
 304                 break;
 305                 }
 306         default:
 307                 result = g_strdup(_("The signature has not been checked"));
 308                 break;
 309         }
 310         if (result == NULL)
 311                 result = g_strdup(_("Error"));
 312         g_free(uname);
 313
 314         if (key)
 315                 gpgme_key_release(key);
 316
 317         return result;
 318 }
 319
 320 gchar *sgpgme_sigstat_info_full(gpgme_ctx_t ctx, gpgme_verify_result_t status)
 321 {
 322         gint i = 0;
 323         gchar *ret;
 324         GString *siginfo;
 325         gpgme_signature_t sig = NULL;
 326
 327         siginfo = g_string_sized_new(64);
 328         if (status == NULL) {
 329                 g_string_append_printf(siginfo,
 330                         _("Error checking signature: no status\n"));
 331                 goto bail;
 332          }
 333
 334         sig = status->signatures;
 335
 336         while (sig) {
 337                 char buf[100];
 338                 struct tm lt;
 339                 gpgme_key_t key;
 340                 gpgme_error_t err;
 341                 const gchar *keytype, *keyid, *uid;
 342
 343                 err = gpgme_get_key(ctx, sig->fpr, &key, 0);
 344
 345                 if (err != GPG_ERR_NO_ERROR) {
 346                         key = NULL;
 347                         g_string_append_printf(siginfo,
 348                                 _("Error checking signature: %s\n"),
 349                                 gpgme_strerror(err));
 350                         goto bail;
 351                 }
 352                 if (key) {
 353                         keytype = gpgme_pubkey_algo_name(
 354                                         key->subkeys->pubkey_algo);
 355                         keyid = key->subkeys->keyid;
 356                         uid = key->uids->uid;
 357                 } else {
 358                         keytype = "?";
 359                         keyid = "?";
 360                         uid = "?";
 361                 }
 362
 363                 memset(buf, 0, sizeof(buf));
 364                 fast_strftime(buf, sizeof(buf)-1, prefs_common_get_prefs()->date_format, localtime_r((time_t *)&sig->timestamp, &lt));
 365                 g_string_append_printf(siginfo,
 366                         _("Signature made on %s using %s key ID %s\n"),
 367                         buf, keytype, keyid);
 368
 369                 switch (gpg_err_code(sig->status)) {
 370                 case GPG_ERR_NO_ERROR:
 371                         g_string_append_printf(siginfo,
 372                                 _("Good signature from uid \"%s\" (Validity: %s)\n"),
 373                                 uid, get_validity_str((key && key->uids) ? key->uids->validity:GPGME_VALIDITY_UNKNOWN));
 374                         break;
 375                 case GPG_ERR_KEY_EXPIRED:
 376                         g_string_append_printf(siginfo,
 377                                 _("Expired key uid \"%s\"\n"),
 378                                 uid);
 379                         break;
 380                 case GPG_ERR_SIG_EXPIRED:
 381                         g_string_append_printf(siginfo,
 382                                 _("Expired signature from uid \"%s\" (Validity: %s)\n"),
 383                                 uid, get_validity_str((key && key->uids) ? key->uids->validity:GPGME_VALIDITY_UNKNOWN));
 384                         break;
 385                 case GPG_ERR_CERT_REVOKED:
 386                         g_string_append_printf(siginfo,
 387                                 _("Revoked key uid \"%s\"\n"),
 388                                 uid);
 389                         break;
 390                 case GPG_ERR_BAD_SIGNATURE:
 391                         g_string_append_printf(siginfo,
 392                                 _("BAD signature from \"%s\"\n"),
 393                                 uid);
 394                         break;
 395                 default:
 396                         break;
 397                 }
 398                 if (sig->status != GPG_ERR_BAD_SIGNATURE) {
 399                         gint j = 1;
 400                         if (key) {
 401                                 key->uids = key->uids ? key->uids->next : NULL;
 402                                 while (key->uids != NULL) {
 403                                         g_string_append_printf(siginfo,
 404                                                 g_strconcat("                    ",
 405                                                             _("uid \"%s\" (Validity: %s)\n"), NULL),
 406                                                 key->uids->uid,
 407                                                 key->uids->revoked==TRUE?_("Revoked"):get_validity_str(key->uids->validity));
 408                                         j++;
 409                                         key->uids = key->uids->next;
 410                                 }
 411                         }
 412                         g_string_append_printf(siginfo,_("Owner Trust: %s\n"),
 413                                                key ? get_owner_trust_str(key->owner_trust) : _("No key!"));
 414                         g_string_append(siginfo,
 415                                 _("Primary key fingerprint:"));
 416                         const char* primary_fpr = NULL;
 417                         if (key && key->subkeys && key->subkeys->fpr)
 418                                 primary_fpr = key->subkeys->fpr;
 419                         else
 420                                 g_string_append(siginfo, " ?");
 421                         int idx; /* now pretty-print the fingerprint */
 422                         for (idx=0; primary_fpr && *primary_fpr!='\0'; idx++, primary_fpr++) {
 423                                 if (idx%4==0)
 424                                         g_string_append_c(siginfo, ' ');
 425                                 if (idx%20==0)
 426                                         g_string_append_c(siginfo, ' ');
 427                                 g_string_append_c(siginfo, (gchar)*primary_fpr);
 428                         }
 429                         g_string_append_c(siginfo, '\n');
 430 #ifdef HAVE_GPGME_PKA_TRUST
 431                         if (sig->pka_trust == 1 && sig->pka_address) {
 432                                 g_string_append_printf(siginfo,
 433                                    _("WARNING: Signer's address \"%s\" "
 434                                       "does not match DNS entry\n"),
 435                                    sig->pka_address);
 436                         }
 437                         else if (sig->pka_trust == 2 && sig->pka_address) {
 438                                 g_string_append_printf(siginfo,
 439                                    _("Verified signer's address is \"%s\"\n"),
 440                                    sig->pka_address);
 441                                 /* FIXME: Compare the address to the
 442                                  * From: address.  */
 443                         }
 444 #endif /*HAVE_GPGME_PKA_TRUST*/
 445                 }
 446
 447                 g_string_append(siginfo, "\n");
 448                 i++;
 449                 sig = sig->next;
 450         }
 451 bail:
 452         ret = siginfo->str;
 453         g_string_free(siginfo, FALSE);
 454         return ret;
 455 }
 456
 457 gpgme_data_t sgpgme_data_from_mimeinfo(MimeInfo *mimeinfo)
 458 {
 459         gpgme_data_t data = NULL;
 460         gpgme_error_t err;
 461         FILE *fp = claws_fopen(mimeinfo->data.filename, "rb");
 462
 463         if (!fp)
 464                 return NULL;
 465
 466         err = gpgme_data_new_from_filepart(&data, NULL, fp, mimeinfo->offset, mimeinfo->length);
 467         claws_fclose(fp);
 468
 469         debug_print("data %p (%d %d)\n", (void *)&data, mimeinfo->offset, mimeinfo->length);
 470         if (err) {
 471                 debug_print ("gpgme_data_new_from_file failed: %s\n",
 472                              gpgme_strerror (err));
 473                 privacy_set_error(_("Couldn't get data from message, %s"), gpgme_strerror(err));
 474                 return NULL;
 475         }
 476         return data;
 477 }
 478
 479 gpgme_data_t sgpgme_decrypt_verify(gpgme_data_t cipher, gpgme_verify_result_t *status, gpgme_ctx_t ctx)
 480 {
 481         struct passphrase_cb_info_s info;
 482         gpgme_data_t plain;
 483         gpgme_error_t err;
 484
 485         memset (&info, 0, sizeof info);
 486
 487         if ((err = gpgme_data_new(&plain)) != GPG_ERR_NO_ERROR) {
 488                 gpgme_release(ctx);
 489                 privacy_set_error(_("Couldn't initialize data, %s"), gpgme_strerror(err));
 490                 return NULL;
 491         }
 492
 493         if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 494                 prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
 495                 if (!g_getenv("GPG_AGENT_INFO") || !prefs_gpg_get_config()->use_gpg_agent) {
 496                         info.c = ctx;
 497                         gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 498                 }
 499         } else {
 500                 prefs_gpg_enable_agent(TRUE);
 501                 info.c = ctx;
 502                 gpgme_set_passphrase_cb (ctx, NULL, &info);
 503         }
 504
 505
 506         if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 507                 err = gpgme_op_decrypt_verify(ctx, cipher, plain);
 508                 if (err != GPG_ERR_NO_ERROR) {
 509                         debug_print("can't decrypt (%s)\n", gpgme_strerror(err));
 510                         privacy_set_error("%s", gpgme_strerror(err));
 511                         gpgmegtk_free_passphrase();
 512                         gpgme_data_release(plain);
 513                         return NULL;
 514                 }
 515
 516                 err = cm_gpgme_data_rewind(plain);
 517                 if (err) {
 518                         debug_print("can't seek (%d %d %s)\n", err, errno, g_strerror(errno));
 519                 }
 520
 521                 debug_print("decrypted.\n");
 522                 *status = gpgme_op_verify_result (ctx);
 523         } else {
 524                 err = gpgme_op_decrypt(ctx, cipher, plain);
 525                 if (err != GPG_ERR_NO_ERROR) {
 526                         debug_print("can't decrypt (%s)\n", gpgme_strerror(err));
 527                         privacy_set_error("%s", gpgme_strerror(err));
 528                         gpgmegtk_free_passphrase();
 529                         gpgme_data_release(plain);
 530                         return NULL;
 531                 }
 532
 533                 err = cm_gpgme_data_rewind(plain);
 534                 if (err) {
 535                         debug_print("can't seek (%d %d %s)\n", err, errno, g_strerror(errno));
 536                 }
 537
 538                 debug_print("decrypted.\n");
 539                 *status = gpgme_op_verify_result (ctx);
 540         }
 541         return plain;
 542 }
 543
 544 gchar *sgpgme_get_encrypt_data(GSList *recp_names, gpgme_protocol_t proto)
 545 {
 546         SelectionResult result = KEY_SELECTION_CANCEL;
 547         gpgme_key_t *keys = gpgmegtk_recipient_selection(recp_names, &result,
 548                                 proto);
 549         gchar *ret = NULL;
 550         int i = 0;
 551
 552         if (!keys) {
 553                 if (result == KEY_SELECTION_DONT)
 554                         return g_strdup("_DONT_ENCRYPT_");
 555                 else
 556                         return NULL;
 557         }
 558         while (keys[i]) {
 559                 gpgme_subkey_t skey = keys[i]->subkeys;
 560                 gchar *fpr = skey->fpr;
 561                 gchar *tmp = NULL;
 562                 debug_print("adding %s\n", fpr);
 563                 tmp = g_strconcat(ret?ret:"", fpr, " ", NULL);
 564                 g_free(ret);
 565                 ret = tmp;
 566                 i++;
 567         }
 568         return ret;
 569 }
 570
 571 gboolean sgpgme_setup_signers(gpgme_ctx_t ctx, PrefsAccount *account,
 572                               const gchar *from_addr)
 573 {
 574         GPGAccountConfig *config;
 575         const gchar *signer_addr = account->address;
 576         SignKeyType sk;
 577         gchar *skid;
 578         gboolean smime = FALSE;
 579
 580         gpgme_signers_clear(ctx);
 581
 582         if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_CMS)
 583                 smime = TRUE;
 584
 585         if (from_addr)
 586                 signer_addr = from_addr;
 587         config = prefs_gpg_account_get_config(account);
 588
 589         if(smime) {
 590                 debug_print("sgpgme_setup_signers: S/MIME protocol\n");
 591                 sk = config->smime_sign_key;
 592                 skid = config->smime_sign_key_id;
 593         } else {
 594                 debug_print("sgpgme_setup_signers: OpenPGP protocol\n");
 595                 sk = config->sign_key;
 596                 skid = config->sign_key_id;
 597         }
 598
 599         switch(sk) {
 600         case SIGN_KEY_DEFAULT:
 601                 debug_print("using default gnupg key\n");
 602                 break;
 603         case SIGN_KEY_BY_FROM:
 604                 debug_print("using key for %s\n", signer_addr);
 605                 break;
 606         case SIGN_KEY_CUSTOM:
 607                 debug_print("using key for %s\n", skid);
 608                 break;
 609         }
 610
 611         if (sk != SIGN_KEY_DEFAULT) {
 612                 const gchar *keyid;
 613                 gpgme_key_t key, found_key;
 614                 gpgme_error_t err;
 615
 616                 if (sk == SIGN_KEY_BY_FROM)
 617                         keyid = signer_addr;
 618                 else if (sk == SIGN_KEY_CUSTOM)
 619                         keyid = skid;
 620                 else
 621                         goto bail;
 622
 623                 found_key = NULL;
 624                 /* Look for any key, not just private ones, or GPGMe doesn't
 625                  * correctly set the revoked flag. */
 626                 err = gpgme_op_keylist_start(ctx, keyid, 0);
 627                 while (err == 0) {
 628                         if ((err = gpgme_op_keylist_next(ctx, &key)) != 0)
 629                                 break;
 630
 631                         if (key == NULL)
 632                                 continue;
 633
 634                         if (!key->can_sign) {
 635                                 debug_print("skipping a key, can not be used for signing\n");
 636                                 gpgme_key_unref(key);
 637                                 continue;
 638                         }
 639
 640                         if (key->protocol != gpgme_get_protocol(ctx)) {
 641                                 debug_print("skipping a key (wrong protocol %d)\n", key->protocol);
 642                                 gpgme_key_unref(key);
 643                                 continue;
 644                         }
 645
 646                         if (key->expired) {
 647                                 debug_print("skipping a key, expired\n");
 648                                 gpgme_key_unref(key);
 649                                 continue;
 650                         }
 651                         if (key->revoked) {
 652                                 debug_print("skipping a key, revoked\n");
 653                                 gpgme_key_unref(key);
 654                                 continue;
 655                         }
 656                         if (key->disabled) {
 657                                 debug_print("skipping a key, disabled\n");
 658                                 gpgme_key_unref(key);
 659                                 continue;
 660                         }
 661
 662                         if (found_key != NULL) {
 663                                 gpgme_key_unref(key);
 664                                 gpgme_op_keylist_end(ctx);
 665                                 g_warning("ambiguous specification of secret key '%s'", keyid);
 666                                 privacy_set_error(_("Secret key specification is ambiguous"));
 667                                 goto bail;
 668                         }
 669
 670                         found_key = key;
 671                 }
 672                 gpgme_op_keylist_end(ctx);
 673
 674                 if (found_key == NULL) {
 675                         g_warning("setup_signers start: %s", gpgme_strerror(err));
 676                         privacy_set_error(_("Secret key not found (%s)"), gpgme_strerror(err));
 677                         goto bail;
 678                 }
 679
 680                 err = gpgme_signers_add(ctx, found_key);
 681                 debug_print("got key (proto %d (pgp %d, smime %d).\n",
 682                             found_key->protocol, GPGME_PROTOCOL_OpenPGP,
 683                             GPGME_PROTOCOL_CMS);
 684                 gpgme_key_unref(found_key);
 685
 686                 if (err) {
 687                         g_warning("error adding secret key: %s",
 688                                   gpgme_strerror(err));
 689                         privacy_set_error(_("Error setting secret key: %s"),
 690                                           gpgme_strerror(err));
 691                         goto bail;
 692                 }
 693         }
 694
 695         prefs_gpg_account_free_config(config);
 696
 697         return TRUE;
 698 bail:
 699         prefs_gpg_account_free_config(config);
 700         return FALSE;
 701 }
 702
 703 void sgpgme_init()
 704 {
 705         gchar *ctype_locale = NULL, *messages_locale = NULL;
 706         gchar *ctype_utf8_locale = NULL, *messages_utf8_locale = NULL;
 707         gpgme_error_t err = 0;
 708
 709         gpgme_engine_info_t engineInfo;
 710
 711         if (strcmp(prefs_gpg_get_config()->gpg_path, "") != 0
 712             && access(prefs_gpg_get_config()->gpg_path, X_OK) != -1) {
 713                 err = gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP, prefs_gpg_get_config()->gpg_path, NULL);
 714                 if (err != GPG_ERR_NO_ERROR)
 715                         g_warning("failed to set crypto engine configuration: %s", gpgme_strerror(err));
 716         }
 717
 718         if (gpgme_check_version("1.0.0")) {
 719 #ifdef LC_CTYPE
 720                 debug_print("setting gpgme CTYPE locale\n");
 721 #ifdef G_OS_WIN32
 722                 ctype_locale = g_win32_getlocale();
 723 #else
 724                 ctype_locale = g_strdup(setlocale(LC_CTYPE, NULL));
 725 #endif
 726                 if (ctype_locale) {
 727                         debug_print("setting gpgme CTYPE locale to: %s\n", ctype_locale);
 728                         if (strchr(ctype_locale, '.'))
 729                                 *(strchr(ctype_locale, '.')) = '\0';
 730                         else if (strchr(ctype_locale, '@'))
 731                                 *(strchr(ctype_locale, '@')) = '\0';
 732                         ctype_utf8_locale = g_strconcat(ctype_locale, ".UTF-8", NULL);
 733
 734                         debug_print("setting gpgme locale to UTF8: %s\n", ctype_utf8_locale ? ctype_utf8_locale : "NULL");
 735                         gpgme_set_locale(NULL, LC_CTYPE, ctype_utf8_locale);
 736
 737                         debug_print("done\n");
 738                         g_free(ctype_utf8_locale);
 739                         g_free(ctype_locale);
 740                 } else {
 741                         debug_print("couldn't set gpgme CTYPE locale\n");
 742                 }
 743 #endif
 744 #ifdef LC_MESSAGES
 745                 debug_print("setting gpgme MESSAGES locale\n");
 746 #ifdef G_OS_WIN32
 747                 messages_locale = g_win32_getlocale();
 748 #else
 749                 messages_locale = g_strdup(setlocale(LC_MESSAGES, NULL));
 750 #endif
 751                 if (messages_locale) {
 752                         debug_print("setting gpgme MESSAGES locale to: %s\n", messages_locale);
 753                         if (strchr(messages_locale, '.'))
 754                                 *(strchr(messages_locale, '.')) = '\0';
 755                         else if (strchr(messages_locale, '@'))
 756                                 *(strchr(messages_locale, '@')) = '\0';
 757                         messages_utf8_locale = g_strconcat(messages_locale, ".UTF-8", NULL);
 758                         debug_print("setting gpgme locale to UTF8: %s\n", messages_utf8_locale ? messages_utf8_locale : "NULL");
 759
 760                         gpgme_set_locale(NULL, LC_MESSAGES, messages_utf8_locale);
 761
 762                         debug_print("done\n");
 763                         g_free(messages_utf8_locale);
 764                         g_free(messages_locale);
 765                 } else {
 766                         debug_print("couldn't set gpgme MESSAGES locale\n");
 767                 }
 768 #endif
 769                 if (!gpgme_get_engine_info(&engineInfo)) {
 770                         while (engineInfo) {
 771                                 debug_print("GpgME Protocol: %s\n"
 772                                             "Version: %s (req %s)\n"
 773                                             "Executable: %s\n",
 774                                         gpgme_get_protocol_name(engineInfo->protocol) ? gpgme_get_protocol_name(engineInfo->protocol):"???",
 775                                         engineInfo->version ? engineInfo->version:"???",
 776                                         engineInfo->req_version ? engineInfo->req_version:"???",
 777                                         engineInfo->file_name ? engineInfo->file_name:"???");
 778                                 if (engineInfo->protocol == GPGME_PROTOCOL_OpenPGP
 779                                 &&  gpgme_engine_check_version(engineInfo->protocol) !=
 780                                         GPG_ERR_NO_ERROR) {
 781                                         if (engineInfo->file_name && !engineInfo->version) {
 782                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable: "
 783                                                                    "Engine '%s' isn't installed properly."),
 784                                                                    gpgme_get_protocol_name(engineInfo->protocol),
 785                                                                    engineInfo->file_name);
 786                                         } else if (engineInfo->file_name && engineInfo->version
 787                                           && engineInfo->req_version) {
 788                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable: "
 789                                                                    "Engine '%s' version %s is installed, "
 790                                                                    "but version %s is required.\n"),
 791                                                                    gpgme_get_protocol_name(engineInfo->protocol),
 792                                                                    engineInfo->file_name,
 793                                                                    engineInfo->version,
 794                                                                    engineInfo->req_version);
 795                                         } else {
 796                                                 alertpanel_error(_("Gpgme protocol '%s' is unusable "
 797                                                                    "(unknown problem)"),
 798                                                                    gpgme_get_protocol_name(engineInfo->protocol));
 799                                         }
 800                                 }
 801                                 engineInfo = engineInfo->next;
 802                         }
 803                 }
 804         } else {
 805                 sgpgme_disable_all();
 806
 807                 if (prefs_gpg_get_config()->gpg_warning) {
 808                         AlertValue val;
 809
 810                         val = alertpanel_full
 811                                 (_("Warning"),
 812                                  _("GnuPG is not installed properly, or needs "
 813                                  "to be upgraded.\n"
 814                                  "OpenPGP support disabled."),
 815                                  GTK_STOCK_CLOSE, NULL, NULL, ALERTFOCUS_FIRST, TRUE, NULL,
 816                                  ALERT_WARNING);
 817                         if (val & G_ALERTDISABLE)
 818                                 prefs_gpg_get_config()->gpg_warning = FALSE;
 819                 }
 820         }
 821 }
 822
 823 void sgpgme_done()
 824 {
 825         gpgmegtk_free_passphrase();
 826 }
 827
 828 #ifdef G_OS_WIN32
 829 struct _ExportCtx {
 830         gboolean done;
 831         gchar *cmd;
 832         DWORD exitcode;
 833 };
 834
 835 static void *_export_threaded(void *arg)
 836 {
 837         struct _ExportCtx *ctx = (struct _ExportCtx *)arg;
 838         gboolean result;
 839
 840         PROCESS_INFORMATION pi = {0};
 841         STARTUPINFO si = {0};
 842
 843         result = CreateProcess(NULL, ctx->cmd, NULL, NULL, FALSE,
 844                         NORMAL_PRIORITY_CLASS | CREATE_NO_WINDOW,
 845                         NULL, NULL, &si, &pi);
 846
 847         if (!result) {
 848                 debug_print("Couldn't execute '%s'\n", ctx->cmd);
 849         } else {
 850                 WaitForSingleObject(pi.hProcess, 10000);
 851                 result = GetExitCodeProcess(pi.hProcess, &ctx->exitcode);
 852                 if (ctx->exitcode == STILL_ACTIVE) {
 853                         debug_print("Process still running, terminating it.\n");
 854                         TerminateProcess(pi.hProcess, 255);
 855                 }
 856
 857                 CloseHandle(pi.hProcess);
 858                 CloseHandle(pi.hThread);
 859
 860                 if (!result) {
 861                         debug_print("Process executed, but we couldn't get its exit code (huh?)\n");
 862                 }
 863         }
 864
 865         ctx->done = TRUE;
 866         return NULL;
 867 }
 868 #endif
 869
 870 void sgpgme_create_secret_key(PrefsAccount *account, gboolean ask_create)
 871 {
 872         AlertValue val = G_ALERTDEFAULT;
 873         gchar *key_parms = NULL;
 874         gchar *name = NULL;
 875         gchar *email = NULL;
 876         gchar *passphrase = NULL, *passphrase_second = NULL;
 877         gint prev_bad = 0;
 878         gchar *tmp = NULL, *gpgver;
 879         gpgme_error_t err = 0;
 880         gpgme_ctx_t ctx;
 881         GtkWidget *window = NULL;
 882         gpgme_genkey_result_t key;
 883         gboolean exported = FALSE;
 884
 885         if (account == NULL)
 886                 account = account_get_default();
 887
 888         if (account->address == NULL) {
 889                 alertpanel_error(_("You have to save the account's information with \"OK\" "
 890                                    "before being able to generate a key pair.\n"));
 891                 return;
 892         }
 893         if (ask_create) {
 894                 val = alertpanel(_("No PGP key found"),
 895                                 _("Claws Mail did not find a secret PGP key, "
 896                                   "which means that you won't be able to sign "
 897                                   "emails or receive encrypted emails.\n"
 898                                   "Do you want to create a new key pair now?"),
 899                                   GTK_STOCK_NO, GTK_STOCK_YES, NULL, ALERTFOCUS_SECOND);
 900                 if (val == G_ALERTDEFAULT) {
 901                         return;
 902                 }
 903         }
 904
 905         if (account->name) {
 906                 name = g_strdup(account->name);
 907         } else {
 908                 name = g_strdup(account->address);
 909         }
 910         email = g_strdup(account->address);
 911         tmp = g_strdup_printf("%s <%s>", account->name?account->name:account->address, account->address);
 912         gpgver = get_gpg_version_string();
 913         if (gpgver == NULL || !strncmp(gpgver, "1.", 2)) {
 914                 debug_print("Using gpg 1.x, using builtin passphrase dialog.\n");
 915 again:
 916                 passphrase = passphrase_mbox(tmp, NULL, prev_bad, 1);
 917                 if (passphrase == NULL) {
 918                         g_free(tmp);
 919                         g_free(email);
 920                         g_free(name);
 921                         return;
 922                 }
 923                 passphrase_second = passphrase_mbox(tmp, NULL, 0, 2);
 924                 if (passphrase_second == NULL) {
 925                         g_free(tmp);
 926                         g_free(email);
 927                         if (passphrase != NULL) {
 928                                 memset(passphrase, 0, strlen(passphrase));
 929                                 g_free(passphrase);
 930                         }
 931                         g_free(name);
 932                         return;
 933                 }
 934                 if (strcmp(passphrase, passphrase_second)) {
 935                         if (passphrase != NULL) {
 936                                 memset(passphrase, 0, strlen(passphrase));
 937                                 g_free(passphrase);
 938                         }
 939                         if (passphrase_second != NULL) {
 940                                 memset(passphrase_second, 0, strlen(passphrase_second));
 941                                 g_free(passphrase_second);
 942                         }
 943                         prev_bad = 1;
 944                         goto again;
 945                 }
 946         }
 947
 948         key_parms = g_strdup_printf("<GnupgKeyParms format=\"internal\">\n"
 949                                         "Key-Type: RSA\n"
 950                                         "Key-Length: 2048\n"
 951                                         "Subkey-Type: RSA\n"
 952                                         "Subkey-Length: 2048\n"
 953                                         "Name-Real: %s\n"
 954                                         "Name-Email: %s\n"
 955                                         "Expire-Date: 0\n"
 956                                         "%s%s%s"
 957                                         "</GnupgKeyParms>\n",
 958                                         name, email,
 959                                         passphrase?"Passphrase: ":"",
 960                                         passphrase?passphrase:"",
 961                                         passphrase?"\n":"");
 962 #ifndef G_PLATFORM_WIN32
 963         if (passphrase &&
 964                         mlock(passphrase, strlen(passphrase)) == -1)
 965                 debug_print("couldn't lock passphrase\n");
 966         if (passphrase_second &&
 967                         mlock(passphrase_second, strlen(passphrase_second)) == -1)
 968                 debug_print("couldn't lock passphrase2\n");
 969 #endif
 970         g_free(tmp);
 971         g_free(email);
 972         g_free(name);
 973         if (passphrase_second != NULL) {
 974                 memset(passphrase_second, 0, strlen(passphrase_second));
 975                 g_free(passphrase_second);
 976         }
 977         if (passphrase != NULL) {
 978                 memset(passphrase, 0, strlen(passphrase));
 979                 g_free(passphrase);
 980         }
 981
 982         err = gpgme_new (&ctx);
 983         if (err) {
 984                 alertpanel_error(_("Couldn't generate a new key pair: %s"),
 985                                  gpgme_strerror(err));
 986                 if (key_parms != NULL) {
 987                         memset(key_parms, 0, strlen(key_parms));
 988                         g_free(key_parms);
 989                 }
 990                 return;
 991         }
 992
 993
 994         window = label_window_create(_("Generating your new key pair... Please move the mouse "
 995                               "around to help generate entropy..."));
 996
 997         err = gpgme_op_genkey(ctx, key_parms, NULL, NULL);
 998         if (key_parms != NULL) {
 999                 memset(key_parms, 0, strlen(key_parms));
1000                 g_free(key_parms);
1001         }
1002
1003         label_window_destroy(window);
1004
1005         if (err) {
1006                 alertpanel_error(_("Couldn't generate a new key pair: %s"), gpgme_strerror(err));
1007                 gpgme_release(ctx);
1008                 return;
1009         }
1010         key = gpgme_op_genkey_result(ctx);
1011         if (key == NULL) {
1012                 alertpanel_error(_("Couldn't generate a new key pair: unknown error"));
1013                 gpgme_release(ctx);
1014                 return;
1015         } else {
1016                 gchar *buf = g_strdup_printf(_("Your new key pair has been generated. "
1017                                     "Its fingerprint is:\n%s\n\nDo you want to export it "
1018                                     "to a keyserver?"),
1019                                     key->fpr ? key->fpr:"null");
1020                 AlertValue val = alertpanel(_("Key generated"), buf,
1021                                   GTK_STOCK_NO, GTK_STOCK_YES, NULL, ALERTFOCUS_SECOND);
1022                 g_free(buf);
1023                 if (val == G_ALERTALTERNATE) {
1024                         gchar *gpgbin = get_gpg_executable_name();
1025                         gchar *cmd = g_strdup_printf("\"%s\" --batch --no-tty --send-keys %s",
1026                                 (gpgbin ? gpgbin : "gpg"), key->fpr);
1027                         debug_print("Executing command: %s\n", cmd);
1028
1029 #ifndef G_OS_WIN32
1030                         int res = 0;
1031                         pid_t pid = 0;
1032                         pid = fork();
1033                         if (pid == -1) {
1034                                 res = -1;
1035                         } else if (pid == 0) {
1036                                 /* son */
1037                                 res = system(cmd);
1038                                 res = WEXITSTATUS(res);
1039                                 _exit(res);
1040                         } else {
1041                                 int status = 0;
1042                                 time_t start_wait = time(NULL);
1043                                 res = -1;
1044                                 do {
1045                                         if (waitpid(pid, &status, WNOHANG) == 0 || !WIFEXITED(status)) {
1046                                                 usleep(200000);
1047                                         } else {
1048                                                 res = WEXITSTATUS(status);
1049                                                 break;
1050                                         }
1051                                         if (time(NULL) - start_wait > 5) {
1052                                                 debug_print("SIGTERM'ing gpg\n");
1053                                                 kill(pid, SIGTERM);
1054                                         }
1055                                         if (time(NULL) - start_wait > 6) {
1056                                                 debug_print("SIGKILL'ing gpg\n");
1057                                                 kill(pid, SIGKILL);
1058                                                 break;
1059                                         }
1060                                 } while(1);
1061                         }
1062
1063                         if (res == 0)
1064                                 exported = TRUE;
1065 #else
1066                         /* We need to call gpg in a separate thread, so that waiting for
1067                          * it to finish does not block the UI. */
1068                         pthread_t pt;
1069                         struct _ExportCtx *ectx = malloc(sizeof(struct _ExportCtx));
1070
1071                         ectx->done = FALSE;
1072                         ectx->exitcode = STILL_ACTIVE;
1073                         ectx->cmd = cmd;
1074
1075                         if (pthread_create(&pt, NULL,
1076                                                 _export_threaded, (void *)ectx) != 0) {
1077                                 debug_print("Couldn't create thread, continuing unthreaded.\n");
1078                                 _export_threaded(ctx);
1079                         } else {
1080                                 debug_print("Thread created, waiting for it to finish...\n");
1081                                 while (!ectx->done)
1082                                         claws_do_idle();
1083                         }
1084
1085                         debug_print("Thread finished.\n");
1086                         pthread_join(pt, NULL);
1087
1088                         if (ectx->exitcode == 0)
1089                                 exported = TRUE;
1090
1091                         g_free(ectx);
1092 #endif
1093                         g_free(cmd);
1094
1095                         if (exported) {
1096                                 alertpanel_notice(_("Key exported."));
1097                         } else {
1098                                 alertpanel_error(_("Couldn't export key."));
1099                         }
1100                 }
1101         }
1102         gpgme_release(ctx);
1103 }
1104
1105 gboolean sgpgme_has_secret_key(void)
1106 {
1107         gpgme_error_t err = 0;
1108         gpgme_ctx_t ctx;
1109         gpgme_key_t key;
1110
1111         err = gpgme_new (&ctx);
1112         if (err) {
1113                 debug_print("err : %s\n", gpgme_strerror(err));
1114                 return TRUE;
1115         }
1116 check_again:
1117         err = gpgme_op_keylist_start(ctx, NULL, TRUE);
1118         if (!err) {
1119                 err = gpgme_op_keylist_next(ctx, &key);
1120                 gpgme_key_unref(key); /* We're not interested in the key itself. */
1121         }
1122         gpgme_op_keylist_end(ctx);
1123         if (gpg_err_code(err) == GPG_ERR_EOF) {
1124                 if (gpgme_get_protocol(ctx) != GPGME_PROTOCOL_CMS) {
1125                         gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
1126                         goto check_again;
1127                 }
1128                 gpgme_release(ctx);
1129                 return FALSE;
1130         } else {
1131                 gpgme_release(ctx);
1132                 return TRUE;
1133         }
1134 }
1135
1136 void sgpgme_check_create_key(void)
1137 {
1138         if (prefs_gpg_get_config()->gpg_ask_create_key &&
1139             !sgpgme_has_secret_key()) {
1140                 sgpgme_create_secret_key(NULL, TRUE);
1141         }
1142
1143         prefs_gpg_get_config()->gpg_ask_create_key = FALSE;
1144         prefs_gpg_save_config();
1145 }
1146
1147 void *sgpgme_data_release_and_get_mem(gpgme_data_t data, size_t *len)
1148 {
1149         char buf[BUFSIZ];
1150         void *result = NULL;
1151         ssize_t r = 0;
1152         size_t w = 0;
1153
1154         cm_return_val_if_fail(data != NULL, NULL);
1155         cm_return_val_if_fail(len != NULL, NULL);
1156
1157         /* I know it's deprecated, but we don't compile with _LARGEFILE */
1158         cm_gpgme_data_rewind(data);
1159         while ((r = gpgme_data_read(data, buf, BUFSIZ)) > 0) {
1160                 void *rresult = realloc(result, r + w);
1161                 if (rresult == NULL) {
1162                         g_warning("can't allocate memory");
1163                         if (result != NULL)
1164                                 free(result);
1165                         return NULL;
1166                 }
1167                 result = rresult;
1168                 memcpy(result+w, buf, r);
1169                 w += r;
1170         }
1171
1172         *len = w;
1173
1174         gpgme_data_release(data);
1175         if (r < 0) {
1176                 g_warning("gpgme_data_read() returned an error: %d", (int)r);
1177                 free(result);
1178                 *len = 0;
1179                 return NULL;
1180         }
1181         return result;
1182 }
1183
1184 gpgme_error_t cm_gpgme_data_rewind(gpgme_data_t dh)
1185 {
1186 #if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64
1187         if (gpgme_data_seek(dh, (off_t)0, SEEK_SET) == -1)
1188                 return gpg_error_from_errno(errno);
1189         else
1190                 return 0;
1191 #else
1192         return gpgme_data_rewind(dh);
1193 #endif
1194 }
1195
1196 #endif /* USE_GPGME */