src/plugins/pgpcore/sgpgme.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2003 Hiroyuki Yamamoto & the Sylpheed-Claws 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 2 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, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.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 <errno.h>
  33
  34 #include "sgpgme.h"
  35 #include "privacy.h"
  36 #include "prefs_common.h"
  37 #include "utils.h"
  38 #include "alertpanel.h"
  39 #include "passphrase.h"
  40 #include "prefs_gpg.h"
  41 #include "select-keys.h"
  42
  43 static void sgpgme_disable_all(void)
  44 {
  45     /* FIXME: set a flag, so that we don't bother the user with failed
  46      * gpgme messages */
  47 }
  48
  49 gpgme_verify_result_t sgpgme_verify_signature(gpgme_ctx_t ctx, gpgme_data_t sig,
  50                                         gpgme_data_t plain, gpgme_data_t dummy)
  51 {
  52         gpgme_verify_result_t status = NULL;
  53         gpgme_error_t err;
  54
  55         if ((err = gpgme_op_verify(ctx, sig, plain, dummy)) != GPG_ERR_NO_ERROR) {
  56                 debug_print("op_verify err %s\n", gpgme_strerror(err));
  57                 return NULL;
  58         }
  59         status = gpgme_op_verify_result(ctx);
  60
  61         return status;
  62 }
  63
  64 SignatureStatus sgpgme_sigstat_gpgme_to_privacy(gpgme_ctx_t ctx, gpgme_verify_result_t status)
  65 {
  66         unsigned long validity = 0;
  67         gpgme_signature_t sig = NULL;
  68
  69         if (status == NULL)
  70                 return SIGNATURE_UNCHECKED;
  71
  72         sig = status->signatures;
  73
  74         if (sig == NULL)
  75                 return SIGNATURE_UNCHECKED;
  76
  77         validity = sig->validity;
  78
  79         switch (gpg_err_code(sig->status)) {
  80         case GPG_ERR_NO_ERROR:
  81                 if ((validity != GPGME_VALIDITY_MARGINAL) &&
  82                     (validity != GPGME_VALIDITY_FULL) &&
  83                     (validity != GPGME_VALIDITY_ULTIMATE))
  84                         return SIGNATURE_WARN;
  85                 return SIGNATURE_OK;
  86         case GPG_ERR_SIG_EXPIRED:
  87         case GPG_ERR_KEY_EXPIRED:
  88                 return SIGNATURE_WARN;
  89         case GPG_ERR_BAD_SIGNATURE:
  90                 return SIGNATURE_INVALID;
  91         case GPG_ERR_NO_PUBKEY:
  92                 return SIGNATURE_CHECK_FAILED;
  93         default:
  94                 return SIGNATURE_CHECK_FAILED;
  95         }
  96         return SIGNATURE_CHECK_FAILED;
  97 }
  98
  99 static const gchar *get_validity_str(unsigned long validity)
 100 {
 101         switch (gpg_err_code(validity)) {
 102         case GPGME_VALIDITY_UNKNOWN:
 103                 return _("Unknown");
 104         case GPGME_VALIDITY_UNDEFINED:
 105                 return _("Undefined");
 106         case GPGME_VALIDITY_NEVER:
 107                 return _("Never");
 108         case GPGME_VALIDITY_MARGINAL:
 109                 return _("Marginal");
 110         case GPGME_VALIDITY_FULL:
 111                 return _("Full");
 112         case GPGME_VALIDITY_ULTIMATE:
 113                 return _("Ultimate");
 114         default:
 115                 return _("Error");
 116         }
 117 }
 118
 119 gchar *sgpgme_sigstat_info_short(gpgme_ctx_t ctx, gpgme_verify_result_t status)
 120 {
 121         gpgme_signature_t sig = NULL;
 122         gchar *uname = NULL;
 123         gpgme_key_t key;
 124
 125         if (status == NULL) {
 126                 return g_strdup(_("The signature has not been checked."));
 127         }
 128         sig = status->signatures;
 129         if (sig == NULL) {
 130                 return g_strdup(_("The signature has not been checked."));
 131         }
 132
 133         gpgme_get_key(ctx, sig->fpr, &key, 0);
 134         if (key)
 135                 uname = key->uids->uid;
 136         else
 137                 uname = "<?>";
 138         switch (gpg_err_code(sig->status)) {
 139         case GPG_ERR_NO_ERROR:
 140         {
 141                 return g_strdup_printf(_("Good signature from %s (Trust: %s)."),
 142                         uname, get_validity_str(sig->validity));
 143         }
 144         case GPG_ERR_SIG_EXPIRED:
 145                 return g_strdup_printf(_("Expired signature from %s."), uname);
 146         case GPG_ERR_KEY_EXPIRED:
 147                 return g_strdup_printf(_("Expired key from %s."), uname);
 148         case GPG_ERR_BAD_SIGNATURE:
 149                 return g_strdup_printf(_("Bad signature from %s."), uname);
 150         case GPG_ERR_NO_PUBKEY:
 151                 return g_strdup(_("No key available to verify this signature."));
 152         default:
 153                 return g_strdup(_("The signature has not been checked."));
 154         }
 155         return g_strdup(_("Error"));
 156 }
 157
 158 gchar *sgpgme_sigstat_info_full(gpgme_ctx_t ctx, gpgme_verify_result_t status)
 159 {
 160         gint i = 0;
 161         gchar *ret;
 162         GString *siginfo;
 163         gpgme_signature_t sig = status->signatures;
 164
 165         siginfo = g_string_sized_new(64);
 166         while (sig) {
 167                 gpgme_user_id_t user = NULL;
 168                 gpgme_key_t key;
 169
 170                 const gchar *keytype, *keyid, *uid;
 171
 172                 gpgme_get_key(ctx, sig->fpr, &key, 0);
 173                 user = key->uids;
 174
 175                 keytype = gpgme_pubkey_algo_name(key->subkeys->pubkey_algo);
 176                 keyid = key->subkeys->keyid;
 177                 g_string_append_printf(siginfo,
 178                         _("Signature made using %s key ID %s\n"),
 179                         keytype, keyid);
 180
 181                 uid = user->uid;
 182                 switch (gpg_err_code(sig->status)) {
 183                 case GPG_ERR_NO_ERROR:
 184                 case GPG_ERR_KEY_EXPIRED:
 185                         g_string_append_printf(siginfo,
 186                                 _("Good signature from \"%s\"\n"),
 187                                 uid);
 188                         break;
 189                 case GPG_ERR_SIG_EXPIRED:
 190                         g_string_append_printf(siginfo,
 191                                 _("Expired signature from \"%s\"\n"),
 192                                 uid);
 193                         break;
 194                 case GPG_ERR_BAD_SIGNATURE:
 195                         g_string_append_printf(siginfo,
 196                                 _("BAD signature from \"%s\"\n"),
 197                                 uid);
 198                         break;
 199                 default:
 200                         break;
 201                 }
 202                 if (sig->status != GPG_ERR_BAD_SIGNATURE) {
 203                         gint j = 1;
 204                         user = user->next;
 205                         while (user != NULL) {
 206                                 g_string_append_printf(siginfo,
 207                                         _("                aka \"%s\"\n"),
 208                                         user->uid);
 209                                 j++;
 210                                 user = user->next;
 211                         }
 212                         g_string_append_printf(siginfo,
 213                                 _("Primary key fingerprint: %s\n"),
 214                                 sig->fpr);
 215                 }
 216
 217                 g_string_append(siginfo, "\n");
 218                 i++;
 219                 sig = sig->next;
 220         }
 221
 222         ret = siginfo->str;
 223         g_string_free(siginfo, FALSE);
 224         return ret;
 225 }
 226
 227 gpgme_data_t sgpgme_data_from_mimeinfo(MimeInfo *mimeinfo)
 228 {
 229         gpgme_data_t data = NULL;
 230         gpgme_error_t err;
 231         FILE *fp = g_fopen(mimeinfo->data.filename, "rb");
 232         gchar *tmp_file = NULL;
 233
 234         if (!fp)
 235                 return NULL;
 236
 237         tmp_file = get_tmp_file();
 238         copy_file_part(fp, mimeinfo->offset, mimeinfo->length, tmp_file);
 239         fclose(fp);
 240         fp = g_fopen(tmp_file, "rb");
 241         debug_print("tmp file %s\n", tmp_file);
 242         if (!fp)
 243                 return NULL;
 244
 245         err = gpgme_data_new_from_file(&data, tmp_file, 1);
 246         g_unlink(tmp_file);
 247         g_free(tmp_file);
 248
 249         debug_print("data %p (%d %d)\n", (void *)&data, mimeinfo->offset, mimeinfo->length);
 250         if (err) {
 251                 debug_print ("gpgme_data_new_from_file failed: %s\n",
 252                              gpgme_strerror (err));
 253                 return NULL;
 254         }
 255         return data;
 256 }
 257
 258 gpgme_data_t sgpgme_decrypt_verify(gpgme_data_t cipher, gpgme_verify_result_t *status, gpgme_ctx_t ctx)
 259 {
 260         struct passphrase_cb_info_s info;
 261         gpgme_data_t plain;
 262         gpgme_error_t err;
 263
 264         memset (&info, 0, sizeof info);
 265
 266         if (gpgme_data_new(&plain) != GPG_ERR_NO_ERROR) {
 267                 gpgme_release(ctx);
 268                 return NULL;
 269         }
 270
 271         if (!getenv("GPG_AGENT_INFO")) {
 272                 info.c = ctx;
 273                 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 274         }
 275
 276         err = gpgme_op_decrypt_verify(ctx, cipher, plain);
 277         if (err != GPG_ERR_NO_ERROR) {
 278                 debug_print("can't decrypt (%s)\n", gpgme_strerror(err));
 279                 gpgmegtk_free_passphrase();
 280                 gpgme_data_release(plain);
 281                 return NULL;
 282         }
 283
 284         err = gpgme_data_rewind(plain);
 285         if (err) {
 286                 debug_print("can't seek (%d %d %s)\n", err, errno, strerror(errno));
 287         }
 288
 289         debug_print("decrypted.\n");
 290         *status = gpgme_op_verify_result (ctx);
 291
 292         return plain;
 293 }
 294
 295 gchar *sgpgme_get_encrypt_data(GSList *recp_names)
 296 {
 297         SelectionResult result = KEY_SELECTION_CANCEL;
 298         gpgme_key_t *keys = gpgmegtk_recipient_selection(recp_names, &result);
 299         gchar *ret = NULL;
 300         int i = 0;
 301
 302         if (!keys) {
 303                 if (result == KEY_SELECTION_DONT)
 304                         return g_strdup("_DONT_ENCRYPT_");
 305                 else
 306                         return NULL;
 307         }
 308         while (keys[i]) {
 309                 gpgme_subkey_t skey = keys[i]->subkeys;
 310                 gchar *fpr = skey->fpr;
 311                 gchar *tmp = NULL;
 312                 debug_print("adding %s\n", fpr);
 313                 tmp = g_strconcat(ret?ret:"", fpr, " ", NULL);
 314                 g_free(ret);
 315                 ret = tmp;
 316                 i++;
 317         }
 318         return ret;
 319 }
 320
 321 gboolean sgpgme_setup_signers(gpgme_ctx_t ctx, PrefsAccount *account)
 322 {
 323         GPGAccountConfig *config;
 324
 325         gpgme_signers_clear(ctx);
 326
 327         config = prefs_gpg_account_get_config(account);
 328
 329         if (config->sign_key != SIGN_KEY_DEFAULT) {
 330                 gchar *keyid;
 331                 gpgme_key_t key;
 332
 333                 if (config->sign_key == SIGN_KEY_BY_FROM)
 334                         keyid = account->address;
 335                 else if (config->sign_key == SIGN_KEY_CUSTOM)
 336                         keyid = config->sign_key_id;
 337                 else
 338                         return FALSE;
 339
 340                 gpgme_op_keylist_start(ctx, keyid, 1);
 341                 while (!gpgme_op_keylist_next(ctx, &key)) {
 342                         gpgme_signers_add(ctx, key);
 343                         gpgme_key_release(key);
 344                 }
 345                 gpgme_op_keylist_end(ctx);
 346         }
 347
 348         prefs_gpg_account_free_config(config);
 349
 350         return TRUE;
 351 }
 352
 353 void sgpgme_init()
 354 {
 355         gpgme_engine_info_t engineInfo;
 356         if (gpgme_check_version("0.4.5")) {
 357                 gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL));
 358                 gpgme_set_locale(NULL, LC_MESSAGES, setlocale(LC_MESSAGES, NULL));
 359                 if (!gpgme_get_engine_info(&engineInfo)) {
 360                         while (engineInfo) {
 361                                 debug_print("GpgME Protocol: %s\n      Version: %s\n",
 362                                         gpgme_get_protocol_name(engineInfo->protocol),
 363                                         engineInfo->version);
 364                                 engineInfo = engineInfo->next;
 365                         }
 366                 }
 367         } else {
 368                 sgpgme_disable_all();
 369
 370                 if (prefs_gpg_get_config()->gpg_warning) {
 371                         AlertValue val;
 372
 373                         val = alertpanel_full
 374                                 (_("Warning"),
 375                                  _("GnuPG is not installed properly, or needs "
 376                                  "to be upgraded.\n"
 377                                  "OpenPGP support disabled."),
 378                                  GTK_STOCK_CLOSE, NULL, NULL, TRUE, NULL,
 379                                  ALERT_WARNING, G_ALERTDEFAULT);
 380                         if (val & G_ALERTDISABLE)
 381                                 prefs_gpg_get_config()->gpg_warning = FALSE;
 382                 }
 383         }
 384 }
 385
 386 void sgpgme_done()
 387 {
 388         gpgmegtk_free_passphrase();
 389 }
 390
 391 #endif /* USE_GPGME */