linux/security/integrity/integrity.h
Mimi Zohar d79d72e024 ima: per hook cache integrity appraisal status
With the new IMA policy 'appraise_type=' option, different hooks
can require different methods for appraising a file's integrity.

For example, the existing 'ima_appraise_tcb' policy defines a
generic rule, requiring all root files to be appraised, without
specfying the appraisal method.  A more specific rule could require
all kernel modules, for example, to be signed.

appraise fowner=0 func=MODULE_CHECK appraise_type=imasig
appraise fowner=0

As a result, the integrity appraisal results for the same inode, but
for different hooks, could differ.  This patch caches the integrity
appraisal results on a per hook basis.

Changelog v2:
- Rename ima_cache_status() to ima_set_cache_status()
- Rename and move get_appraise_status() to ima_get_cache_status()
Changelog v0:
- include IMA_APPRAISE/APPRAISED_SUBMASK in IMA_DO/DONE_MASK (Dmitry)
- Support independent MODULE_CHECK appraise status.
- fixed IMA_XXXX_APPRAISE/APPRAISED flags

Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
2013-01-22 16:10:36 -05:00

106 lines
3.1 KiB
C

/*
* Copyright (C) 2009-2010 IBM Corporation
*
* Authors:
* Mimi Zohar <zohar@us.ibm.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.
*
*/
#include <linux/types.h>
#include <linux/integrity.h>
#include <crypto/sha.h>
/* iint action cache flags */
#define IMA_MEASURE 0x00000001
#define IMA_MEASURED 0x00000002
#define IMA_APPRAISE 0x00000004
#define IMA_APPRAISED 0x00000008
/*#define IMA_COLLECT 0x00000010 do not use this flag */
#define IMA_COLLECTED 0x00000020
#define IMA_AUDIT 0x00000040
#define IMA_AUDITED 0x00000080
/* iint cache flags */
#define IMA_ACTION_FLAGS 0xff000000
#define IMA_DIGSIG 0x01000000
#define IMA_DIGSIG_REQUIRED 0x02000000
#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
IMA_APPRAISE_SUBMASK)
#define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
IMA_COLLECTED | IMA_APPRAISED_SUBMASK)
/* iint subaction appraise cache flags */
#define IMA_FILE_APPRAISE 0x00000100
#define IMA_FILE_APPRAISED 0x00000200
#define IMA_MMAP_APPRAISE 0x00000400
#define IMA_MMAP_APPRAISED 0x00000800
#define IMA_BPRM_APPRAISE 0x00001000
#define IMA_BPRM_APPRAISED 0x00002000
#define IMA_MODULE_APPRAISE 0x00004000
#define IMA_MODULE_APPRAISED 0x00008000
#define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE)
#define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED)
enum evm_ima_xattr_type {
IMA_XATTR_DIGEST = 0x01,
EVM_XATTR_HMAC,
EVM_IMA_XATTR_DIGSIG,
};
struct evm_ima_xattr_data {
u8 type;
u8 digest[SHA1_DIGEST_SIZE];
} __attribute__((packed));
/* integrity data associated with an inode */
struct integrity_iint_cache {
struct rb_node rb_node; /* rooted in integrity_iint_tree */
struct inode *inode; /* back pointer to inode in question */
u64 version; /* track inode changes */
unsigned long flags;
struct evm_ima_xattr_data ima_xattr;
enum integrity_status ima_file_status:4;
enum integrity_status ima_mmap_status:4;
enum integrity_status ima_bprm_status:4;
enum integrity_status ima_module_status:4;
enum integrity_status evm_status:4;
};
/* rbtree tree calls to lookup, insert, delete
* integrity data associated with an inode.
*/
struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
#define INTEGRITY_KEYRING_EVM 0
#define INTEGRITY_KEYRING_MODULE 1
#define INTEGRITY_KEYRING_IMA 2
#define INTEGRITY_KEYRING_MAX 3
#ifdef CONFIG_INTEGRITY_SIGNATURE
int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
const char *digest, int digestlen);
#else
static inline int integrity_digsig_verify(const unsigned int id,
const char *sig, int siglen,
const char *digest, int digestlen)
{
return -EOPNOTSUPP;
}
#endif /* CONFIG_INTEGRITY_SIGNATURE */
/* set during initialization */
extern int iint_initialized;