Allow MAC policy modules to control access to audit configuration system

calls.  Add MAC Framework entry points and MAC policy entry points for
audit(), auditctl(), auditon(), setaudit(), aud setauid().

MAC Framework entry points are only added for audit system calls where
additional argument context may be useful for policy decision-making; other
audit system calls without arguments may be controlled via the priv(9)
entry points.

Update various policy modules to implement audit-related checks, and in
some cases, other missing system-related checks.

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

1 files changed, 46 insertions, 0 deletions

diff --git a/sys/security/mac_biba/mac_biba.c b/sys/security/mac_biba/mac_biba.c
index 202aeed..abb817d 100644
--- a/sys/security/mac_biba/mac_biba.c
+++ b/sys/security/mac_biba/mac_biba.c
@@ -2304,6 +2304,50 @@ mac_biba_check_system_acct(struct ucred *cred, struct vnode *vp,
 }
 
 static int
+mac_biba_check_system_auditctl(struct ucred *cred, struct vnode *vp,
+    struct label *vplabel)
+{
+	struct mac_biba *subj, *obj;
+	int error;
+
+	if (!mac_biba_enabled)
+		return (0);
+
+	subj = SLOT(cred->cr_label);
+
+	error = mac_biba_subject_privileged(subj);
+	if (error)
+		return (error);
+
+	if (vplabel == NULL)
+		return (0);
+
+	obj = SLOT(vplabel);
+	if (!mac_biba_high_effective(obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_biba_check_system_auditon(struct ucred *cred, int cmd)
+{
+	struct mac_biba *subj;
+	int error;
+
+	if (!mac_biba_enabled)
+		return (0);
+
+	subj = SLOT(cred->cr_label);
+
+	error = mac_biba_subject_privileged(subj);
+	if (error)
+		return (error);
+
+	return (0);
+}
+
+static int
 mac_biba_check_system_settime(struct ucred *cred)
 {
 	struct mac_biba *subj;
@@ -3204,6 +3248,8 @@ static struct mac_policy_ops mac_biba_ops =
 	.mpo_check_socket_visible = mac_biba_check_socket_visible,
 	.mpo_check_sysarch_ioperm = mac_biba_check_sysarch_ioperm,
 	.mpo_check_system_acct = mac_biba_check_system_acct,
+	.mpo_check_system_auditctl = mac_biba_check_system_auditctl,
+	.mpo_check_system_auditon = mac_biba_check_system_auditon,
 	.mpo_check_system_settime = mac_biba_check_system_settime,
 	.mpo_check_system_swapon = mac_biba_check_system_swapon,
 	.mpo_check_system_swapoff = mac_biba_check_system_swapoff,