mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 03:56:44 +07:00
7d2ce2320e
Require all keys added to the IMA keyring be signed by an existing trusted key on the system trusted keyring. Changelog v6: - remove ifdef CONFIG_IMA_TRUSTED_KEYRING in C code - Dmitry - update Kconfig dependency and help - select KEYS_DEBUG_PROC_KEYS - Dmitry Changelog v5: - Move integrity_init_keyring() to init_ima() - Dmitry - reset keyring[id] on failure - Dmitry Changelog v1: - don't link IMA trusted keyring to user 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) - only make the IMA keyring a trusted keyring (reported-by D. Kastatkin) - define stub integrity_init_keyring() definition based on CONFIG_INTEGRITY_SIGNATURE, not CONFIG_INTEGRITY_ASYMMETRIC_KEYS. (reported-by Jim Davis) Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com> Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com> Acked-by: David Howells <dhowells@redhat.com>
87 lines
2.0 KiB
C
87 lines
2.0 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];
|
|
|
|
static const char *keyring_name[INTEGRITY_KEYRING_MAX] = {
|
|
"_evm",
|
|
"_module",
|
|
#ifndef CONFIG_IMA_TRUSTED_KEYRING
|
|
"_ima",
|
|
#else
|
|
".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();
|
|
int err = 0;
|
|
|
|
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_USR_WRITE | KEY_USR_SEARCH),
|
|
KEY_ALLOC_NOT_IN_QUOTA, NULL);
|
|
if (!IS_ERR(keyring[id]))
|
|
set_bit(KEY_FLAG_TRUSTED_ONLY, &keyring[id]->flags);
|
|
else {
|
|
err = PTR_ERR(keyring[id]);
|
|
pr_info("Can't allocate %s keyring (%d)\n",
|
|
keyring_name[id], err);
|
|
keyring[id] = NULL;
|
|
}
|
|
return err;
|
|
}
|