linux-kernel - [PATCH v2 18/23] ima: add audit log support for larger hashes

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Message-Id: <1382395388-8108-19-git-send-email-zohar@linux.vnet.ibm.com>
Date:	Mon, 21 Oct 2013 18:43:03 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	linux-security-module@...r.kernel.org
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, James Morris <jmorris@...ei.org>,
	David Howells <dhowells@...hat.com>,
	Peter Moody <pmoody@...gle.com>,
	Roberto Sassu <roberto.sassu@...ito.it>
Subject: [PATCH v2 18/23] ima: add audit log support for larger hashes

Different files might be signed based on different hash algorithms.
This patch prefixes the audit log measurement hash with the hash
algorithm.

Changelog:
- use generic HASH_ALGO defintions
- use ':' as delimiter between the hash algorithm and the digest
  (Roberto Sassu)

Signed-off-by: Mimi Zohar <zohar@...ux.vnet.ibm.com>
Signed-off-by: Roberto Sassu <roberto.sassu@...ito.it>
---
 security/integrity/ima/ima_api.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index baa3481..f22725e 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -287,6 +287,12 @@ void ima_audit_measurement(struct integrity_iint_cache *iint,
 	audit_log_format(ab, "file=");
 	audit_log_untrustedstring(ab, filename);
 	audit_log_format(ab, " hash=");
+	if (iint->ima_hash->algo != HASH_ALGO_SHA1 &&
+	    iint->ima_hash->algo != HASH_ALGO_MD5) {
+		audit_log_untrustedstring(ab,
+					  hash_algo_name[iint->ima_hash->algo]);
+		audit_log_format(ab, ":");
+	}
 	audit_log_untrustedstring(ab, hash);
 
 	audit_log_task_info(ab, current);
-- 
1.8.1.4

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