mirror of
https://github.com/torvalds/linux.git
synced 2024-10-31 17:21:49 +00:00
217091dd7a
Require all keys added to the IMA keyring be signed by an existing trusted key on the system trusted keyring. Changelog: - define stub integrity_init_keyring() function (reported-by Fengguang Wu) - differentiate between regular and trusted keyring names. - replace printk with pr_info (D. Kasatkin) Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
/*
|
|
* Copyright (C) 2011 Intel Corporation
|
|
*
|
|
* Author:
|
|
* Dmitry Kasatkin <dmitry.kasatkin@intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, version 2 of the License.
|
|
*
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/rbtree.h>
|
|
#include <linux/cred.h>
|
|
#include <linux/key-type.h>
|
|
#include <linux/digsig.h>
|
|
|
|
#include "integrity.h"
|
|
|
|
static struct key *keyring[INTEGRITY_KEYRING_MAX];
|
|
|
|
#ifdef CONFIG_IMA_TRUSTED_KEYRING
|
|
static const char *keyring_name[INTEGRITY_KEYRING_MAX] = {
|
|
".evm",
|
|
".module",
|
|
".ima",
|
|
};
|
|
#else
|
|
static const char *keyring_name[INTEGRITY_KEYRING_MAX] = {
|
|
"_evm",
|
|
"_module",
|
|
"_ima",
|
|
};
|
|
#endif
|
|
|
|
int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
|
|
const char *digest, int digestlen)
|
|
{
|
|
if (id >= INTEGRITY_KEYRING_MAX)
|
|
return -EINVAL;
|
|
|
|
if (!keyring[id]) {
|
|
keyring[id] =
|
|
request_key(&key_type_keyring, keyring_name[id], NULL);
|
|
if (IS_ERR(keyring[id])) {
|
|
int err = PTR_ERR(keyring[id]);
|
|
pr_err("no %s keyring: %d\n", keyring_name[id], err);
|
|
keyring[id] = NULL;
|
|
return err;
|
|
}
|
|
}
|
|
|
|
switch (sig[1]) {
|
|
case 1:
|
|
/* v1 API expect signature without xattr type */
|
|
return digsig_verify(keyring[id], sig + 1, siglen - 1,
|
|
digest, digestlen);
|
|
case 2:
|
|
return asymmetric_verify(keyring[id], sig, siglen,
|
|
digest, digestlen);
|
|
}
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
int integrity_init_keyring(const unsigned int id)
|
|
{
|
|
const struct cred *cred = current_cred();
|
|
const struct user_struct *user = cred->user;
|
|
|
|
keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
|
|
KGIDT_INIT(0), cred,
|
|
((KEY_POS_ALL & ~KEY_POS_SETATTR) |
|
|
KEY_USR_VIEW | KEY_USR_READ),
|
|
KEY_ALLOC_NOT_IN_QUOTA, user->uid_keyring);
|
|
if (!IS_ERR(keyring[id]))
|
|
set_bit(KEY_FLAG_TRUSTED_ONLY, &keyring[id]->flags);
|
|
else
|
|
pr_info("Can't allocate %s keyring (%ld)\n",
|
|
keyring_name[id], PTR_ERR(keyring[id]));
|
|
return 0;
|
|
}
|