Add static DTrace probes for MAC Framework access control checks and

privilege grants so that dtrace can be more easily used to monitor
the security decisions being generated by the MAC Framework following
policy invocation.

Successful access control checks will be reported by:

  mac_framework:kernel:<entrypoint>:mac_check_ok

Failed access control checks will be reported by:

  mac_framework:kernel:<entrypoint>:mac_check_err

Successful privilege grants will be reported by:

  mac_framework:kernel:priv_grant:mac_grant_ok

Failed privilege grants will be reported by:

  mac_framework:kernel:priv_grant:mac_grant_err

In all cases, the return value (always 0 for _ok, otherwise an errno
for _err) will be reported via arg0 on the probe, and subsequent
arguments will hold entrypoint-specific data, in a style similar to
privilege tracing.

Obtained from:	TrustedBSD Project
Sponsored by:	Google, Inc.

1 files changed, 14 insertions, 1 deletions

diff --git a/sys/security/mac/mac_cred.c b/sys/security/mac/mac_cred.c
index 4d46f9a..8cac7b3 100644
--- a/sys/security/mac/mac_cred.c
+++ b/sys/security/mac/mac_cred.c
@@ -1,5 +1,5 @@
 /*-
- * Copyright (c) 1999-2002, 2008 Robert N. M. Watson
+ * Copyright (c) 1999-2002, 2008-2009 Robert N. M. Watson
  * Copyright (c) 2001 Ilmar S. Habibulin
  * Copyright (c) 2001-2003 Networks Associates Technology, Inc.
  * Copyright (c) 2005 Samy Al Bahra
@@ -18,6 +18,9 @@
  * This software was enhanced by SPARTA ISSO under SPAWAR contract
  * N66001-04-C-6019 ("SEFOS").
  *
+ * This software was developed at the University of Cambridge Computer
+ * Laboratory with support from a grant from Google, Inc. 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -43,6 +46,7 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include "opt_kdtrace.h"
 #include "opt_mac.h"
 
 #include <sys/param.h>
@@ -55,6 +59,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/mac.h>
 #include <sys/proc.h>
 #include <sys/sbuf.h>
+#include <sys/sdt.h>
 #include <sys/systm.h>
 #include <sys/vnode.h>
 #include <sys/mount.h>
@@ -192,22 +197,30 @@ mac_cred_relabel(struct ucred *cred, struct label *newlabel)
 	MAC_PERFORM(cred_relabel, cred, newlabel);
 }
 
+MAC_CHECK_PROBE_DEFINE2(cred_check_relabel, "struct ucred *",
+    "struct label *");
+
 int
 mac_cred_check_relabel(struct ucred *cred, struct label *newlabel)
 {
 	int error;
 
 	MAC_CHECK(cred_check_relabel, cred, newlabel);
+	MAC_CHECK_PROBE2(cred_check_relabel, error, cred, newlabel);
 
 	return (error);
 }
 
+MAC_CHECK_PROBE_DEFINE2(cred_check_visible, "struct ucred *",
+    "struct ucred *");
+
 int
 mac_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
 {
 	int error;
 
 	MAC_CHECK(cred_check_visible, cr1, cr2);
+	MAC_CHECK_PROBE2(cred_check_visible, error, cr1, cr2);
 
 	return (error);
 }