security/integrity/ima/ima_mok.c

   1 /*
   2  * Copyright (C) 2015 Juniper Networks, Inc.
   3  *
   4  * Author:
   5  * Petko Manolov <petko.manolov@konsulko.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation, version 2 of the
  10  * License.
  11  *
  12  */
  13
  14 #include <linux/export.h>
  15 #include <linux/kernel.h>
  16 #include <linux/sched.h>
  17 #include <linux/cred.h>
  18 #include <linux/err.h>
  19 #include <linux/init.h>
  20 #include <keys/asymmetric-type.h>
  21
  22
  23 struct key *ima_mok_keyring;
  24 struct key *ima_blacklist_keyring;
  25
  26 /*
  27  * Allocate the IMA MOK and blacklist keyrings
  28  */
  29 __init int ima_mok_init(void)
  30 {
  31         pr_notice("Allocating IMA MOK and blacklist keyrings.\n");
  32
  33         ima_mok_keyring = keyring_alloc(".ima_mok",
  34                               KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
  35                               (KEY_POS_ALL & ~KEY_POS_SETATTR) |
  36                               KEY_USR_VIEW | KEY_USR_READ |
  37                               KEY_USR_WRITE | KEY_USR_SEARCH,
  38                               KEY_ALLOC_NOT_IN_QUOTA, NULL);
  39
  40         ima_blacklist_keyring = keyring_alloc(".ima_blacklist",
  41                                 KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
  42                                 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
  43                                 KEY_USR_VIEW | KEY_USR_READ |
  44                                 KEY_USR_WRITE | KEY_USR_SEARCH,
  45                                 KEY_ALLOC_NOT_IN_QUOTA, NULL);
  46
  47         if (IS_ERR(ima_mok_keyring) || IS_ERR(ima_blacklist_keyring))
  48                 panic("Can't allocate IMA MOK or blacklist keyrings.");
  49         set_bit(KEY_FLAG_TRUSTED_ONLY, &ima_mok_keyring->flags);
  50
  51         set_bit(KEY_FLAG_TRUSTED_ONLY, &ima_blacklist_keyring->flags);
  52         set_bit(KEY_FLAG_KEEP, &ima_blacklist_keyring->flags);
  53         return 0;
  54 }
  55 device_initcall(ima_mok_init);