Commit dba31ee7 authored Jun 04, 2018 by Stefan Berger Committed by Mimi Zohar Jul 18, 2018

ima: Differentiate auditing policy rules from "audit" actions



The AUDIT_INTEGRITY_RULE is used for auditing IMA policy rules and
the IMA "audit" policy action.  This patch defines
AUDIT_INTEGRITY_POLICY_RULE to reflect the IMA policy rules.

Since we defined a new message type we can now also pass the
audit_context and get an associated SYSCALL record. This now produces
the following records when parsing IMA policy's rules:

type=UNKNOWN[1807] msg=audit(1527888965.738:320): action=audit \
  func=MMAP_CHECK mask=MAY_EXEC res=1
type=UNKNOWN[1807] msg=audit(1527888965.738:320): action=audit \
  func=FILE_CHECK mask=MAY_READ res=1
type=SYSCALL msg=audit(1527888965.738:320): arch=c000003e syscall=1 \
  success=yes exit=17 a0=1 a1=55bcfcca9030 a2=11 a3=7fcc1b55fb38 \
  items=0 ppid=1567 pid=1601 auid=0 uid=0 gid=0 euid=0 suid=0 \
  fsuid=0 egid=0 sgid=0 fsgid=0 tty=tty2 ses=2 comm="echo" \
  exe="/usr/bin/echo" \
  subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>

parent 2afd020a

include/uapi/linux/audit.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -148,6 +148,7 @@
		#define AUDIT_INTEGRITY_PCR 1804 /* PCR invalidation msgs */
		#define AUDIT_INTEGRITY_RULE 1805 /* policy rule */
		#define AUDIT_INTEGRITY_EVM_XATTR 1806 /* New EVM-covered xattr */
		#define AUDIT_INTEGRITY_POLICY_RULE 1807 /* IMA policy rules */

		#define AUDIT_KERNEL 2000 /* Asynchronous audit record. NOT A REQUEST. */

security/integrity/ima/ima_policy.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -681,8 +681,8 @@ static int ima_parse_rule(char rule, struct ima_rule_entry entry)
		bool uid_token;
		int result = 0;

		ab = integrity_audit_log_start(NULL, GFP_KERNEL,
		AUDIT_INTEGRITY_RULE);
		ab = integrity_audit_log_start(audit_context(), GFP_KERNEL,
		AUDIT_INTEGRITY_POLICY_RULE);

		entry->uid = INVALID_UID;
		entry->fowner = INVALID_UID;