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ima: generic IMA action flag handling 

Make the IMA action flag handling generic in order to support
additional new actions, without requiring changes to the base
implementation.  New actions, like audit logging, will only
need to modify the define statements.

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
Dmitry Kasatkin 2012-09-12 20:51:32 +03:00 committed by Mimi Zohar
parent d9d300cdb6
commit 45e2472e67
4 changed files with 26 additions and 19 deletions
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2
security/integrity/ima/ima_appraise.c
View File

@ -232,7 +232,7 @@ static void ima_reset_appraise_flags(struct inode *inode)
if (!iint)
return;
iint->flags &= ~(IMA_COLLECTED | IMA_APPRAISED | IMA_MEASURED);
iint->flags &= ~IMA_DONE_MASK;
return;
}

4
security/integrity/ima/ima_main.c
View File

@ -117,7 +117,7 @@ static void ima_check_last_writer(struct integrity_iint_cache *iint,
mutex_lock(&inode->i_mutex);
if (atomic_read(&inode->i_writecount) == 1 &&
iint->version != inode->i_version) {
iint->flags &= ~(IMA_COLLECTED | IMA_APPRAISED | IMA_MEASURED);
iint->flags &= ~IMA_DONE_MASK;
if (iint->flags & IMA_APPRAISE)
ima_update_xattr(iint, file);
}
@ -173,7 +173,7 @@ static int process_measurement(struct file *file, const unsigned char *filename,
/* Determine if already appraised/measured based on bitmask
* (IMA_MEASURE, IMA_MEASURED, IMA_APPRAISE, IMA_APPRAISED) */
iint->flags |= action;
action &= ~((iint->flags & (IMA_MEASURED | IMA_APPRAISED)) >> 1);
action &= ~((iint->flags & IMA_DONE_MASK) >> 1);
/* Nothing to do, just return existing appraised status */
if (!action) {

21
security/integrity/ima/ima_policy.c
View File

@ -26,13 +26,11 @@
#define IMA_UID 0x0008
#define IMA_FOWNER 0x0010
#define UNKNOWN 0
#define MEASURE 1 /* same as IMA_MEASURE */
#define DONT_MEASURE 2
#define MEASURE_MASK 3
#define APPRAISE 4 /* same as IMA_APPRAISE */
#define DONT_APPRAISE 8
#define APPRAISE_MASK 12
#define UNKNOWN 0
#define MEASURE 0x0001 /* same as IMA_MEASURE */
#define DONT_MEASURE 0x0002
#define APPRAISE 0x0004 /* same as IMA_APPRAISE */
#define DONT_APPRAISE 0x0008
#define MAX_LSM_RULES 6
enum lsm_rule_types { LSM_OBJ_USER, LSM_OBJ_ROLE, LSM_OBJ_TYPE,
@ -209,9 +207,12 @@ int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
if (!ima_match_rules(entry, inode, func, mask))
continue;
action |= (entry->action & (IMA_APPRAISE | IMA_MEASURE));
actmask &= (entry->action & APPRAISE_MASK) ?
~APPRAISE_MASK : ~MEASURE_MASK;
action |= entry->action & IMA_DO_MASK;
if (entry->action & IMA_DO_MASK)
actmask &= ~(entry->action | entry->action << 1);
else
actmask &= ~(entry->action | entry->action >> 1);
if (!actmask)
break;
}

18
security/integrity/integrity.h
View File

@ -15,13 +15,19 @@
#include <linux/integrity.h>
#include <crypto/sha.h>
/* iint action cache flags */
#define IMA_MEASURE 0x0001
#define IMA_MEASURED 0x0002
#define IMA_APPRAISE 0x0004
#define IMA_APPRAISED 0x0008
/*#define IMA_COLLECT 0x0010 do not use this flag */
#define IMA_COLLECTED 0x0020
/* iint cache flags */
#define IMA_MEASURE 0x01
#define IMA_MEASURED 0x02
#define IMA_APPRAISE 0x04
#define IMA_APPRAISED 0x08
#define IMA_COLLECTED 0x10
#define IMA_DIGSIG 0x20
#define IMA_DIGSIG 0x0100
#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE)
#define IMA_DONE_MASK (IMA_MEASURED | IMA_APPRAISED | IMA_COLLECTED)
enum evm_ima_xattr_type {
IMA_XATTR_DIGEST = 0x01,