git.notmuchmail.org Git - notmuch/blob - util/crypto.c

   1 /* notmuch - Not much of an email program, (just index and search)
   2  *
   3  * Copyright © 2012 Jameson Rollins
   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 https://www.gnu.org/licenses/ .
  17  *
  18  * Authors: Jameson Rollins <jrollins@finestructure.net>
  19  */
  20
  21 #include "crypto.h"
  22 #include <strings.h>
  23 #define unused(x) x __attribute__ ((unused))
  24
  25 #define ARRAY_SIZE(arr) (sizeof (arr) / sizeof (arr[0]))
  26
  27 void _notmuch_crypto_cleanup (unused(_notmuch_crypto_t *crypto))
  28 {
  29 }
  30
  31 GMimeObject *
  32 _notmuch_crypto_decrypt (bool *attempted,
  33                          notmuch_decryption_policy_t decrypt,
  34                          notmuch_message_t *message,
  35                          GMimeMultipartEncrypted *part,
  36                          GMimeDecryptResult **decrypt_result,
  37                          GError **err)
  38 {
  39     GMimeObject *ret = NULL;
  40     if (decrypt == NOTMUCH_DECRYPT_FALSE)
  41         return NULL;
  42
  43     /* try decryption with session key if one is stashed */
  44     if (message) {
  45         notmuch_message_properties_t *list = NULL;
  46
  47         for (list = notmuch_message_get_properties (message, "session-key", TRUE);
  48              notmuch_message_properties_valid (list); notmuch_message_properties_move_to_next (list)) {
  49             if (err && *err) {
  50                 g_error_free (*err);
  51                 *err = NULL;
  52             }
  53             if (attempted)
  54                 *attempted = true;
  55             ret = g_mime_multipart_encrypted_decrypt (part,
  56                                                       GMIME_DECRYPT_NONE,
  57                                                       notmuch_message_properties_value (list),
  58                                                       decrypt_result, err);
  59             if (ret)
  60                 break;
  61         }
  62         if (list)
  63             notmuch_message_properties_destroy (list);
  64         if (ret)
  65             return ret;
  66     }
  67
  68     if (err && *err) {
  69         g_error_free (*err);
  70         *err = NULL;
  71     }
  72
  73     if (decrypt == NOTMUCH_DECRYPT_AUTO)
  74         return ret;
  75
  76     if (attempted)
  77         *attempted = true;
  78     GMimeDecryptFlags flags = GMIME_DECRYPT_NONE;
  79     if (decrypt == NOTMUCH_DECRYPT_TRUE && decrypt_result)
  80         flags |= GMIME_DECRYPT_EXPORT_SESSION_KEY;
  81     ret = g_mime_multipart_encrypted_decrypt(part, flags, NULL,
  82                                              decrypt_result, err);
  83     return ret;
  84 }