From 2faa6ef3b21152cc05b69a84113625dcee63176f Mon Sep 17 00:00:00 2001
From: Dmitry Kasatkin <d.kasatkin@samsung.com>
Date: Thu, 8 May 2014 13:11:29 +0300
Subject: [PATCH] ima: provide 'ima_appraise=log' kernel option
The kernel boot parameter "ima_appraise" currently defines 'off',
'enforce' and 'fix' modes. When designing a policy and labeling
the system, access to files are either blocked in the default
'enforce' mode or automatically fixed in the 'fix' mode. It is
beneficial to be able to run the system in a logging only mode,
without fixing it, in order to properly analyze the system. This
patch adds a 'log' mode to run the system in a permissive mode and
log the appraisal results.
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
---
Documentation/kernel-parameters.txt | 2 +-
security/integrity/ima/ima.h | 5 +++--
security/integrity/ima/ima_appraise.c | 2 ++
3 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 90c12c5911683..2aa1b6e74acad 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1292,7 +1292,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Set number of hash buckets for inode cache.
ima_appraise= [IMA] appraise integrity measurements
- Format: { "off" | "enforce" | "fix" }
+ Format: { "off" | "enforce" | "fix" | "log" }
default: "enforce"
ima_appraise_tcb [IMA]
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 8e4bb883fc133..d61680dcd3650 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -159,8 +159,9 @@ void ima_delete_rules(void);
/* Appraise integrity measurements */
#define IMA_APPRAISE_ENFORCE 0x01
#define IMA_APPRAISE_FIX 0x02
-#define IMA_APPRAISE_MODULES 0x04
-#define IMA_APPRAISE_FIRMWARE 0x08
+#define IMA_APPRAISE_LOG 0x04
+#define IMA_APPRAISE_MODULES 0x08
+#define IMA_APPRAISE_FIRMWARE 0x10
#ifdef CONFIG_IMA_APPRAISE
int ima_appraise_measurement(int func, struct integrity_iint_cache *iint,
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 013ec3f0e42da..2dc13fbb7e91c 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -23,6 +23,8 @@ static int __init default_appraise_setup(char *str)
{
if (strncmp(str, "off", 3) == 0)
ima_appraise = 0;
+ else if (strncmp(str, "log", 3) == 0)
+ ima_appraise = IMA_APPRAISE_LOG;
else if (strncmp(str, "fix", 3) == 0)
ima_appraise = IMA_APPRAISE_FIX;
return 1;
--
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