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2b6aa412ff
Replace struct key's restrict_link function pointer with a pointer to the new struct key_restriction. The structure contains pointers to the restriction function as well as relevant data for evaluating the restriction. The garbage collector checks restrict_link->keytype when key types are unregistered. Restrictions involving a removed key type are converted to use restrict_link_reject so that restrictions cannot be removed by unregistering key types. Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/*
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* Copyright (C) 2015 Juniper Networks, Inc.
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*
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* Author:
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* Petko Manolov <petko.manolov@konsulko.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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*/
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/cred.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <keys/system_keyring.h>
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struct key *ima_blacklist_keyring;
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/*
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* Allocate the IMA blacklist keyring
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*/
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__init int ima_mok_init(void)
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{
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struct key_restriction *restriction;
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pr_notice("Allocating IMA blacklist keyring.\n");
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restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
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if (!restriction)
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panic("Can't allocate IMA blacklist restriction.");
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restriction->check = restrict_link_by_builtin_trusted;
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ima_blacklist_keyring = keyring_alloc(".ima_blacklist",
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KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
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(KEY_POS_ALL & ~KEY_POS_SETATTR) |
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KEY_USR_VIEW | KEY_USR_READ |
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KEY_USR_WRITE | KEY_USR_SEARCH,
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KEY_ALLOC_NOT_IN_QUOTA,
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restriction, NULL);
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if (IS_ERR(ima_blacklist_keyring))
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panic("Can't allocate IMA blacklist keyring.");
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set_bit(KEY_FLAG_KEEP, &ima_blacklist_keyring->flags);
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return 0;
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}
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device_initcall(ima_mok_init);
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