2 files changed, 2842 insertions, 0 deletions

diff --git a/sys/security/mac_lomac/mac_lomac.c b/sys/security/mac_lomac/mac_lomac.c
new file mode 100644
index 000000000000..07dd1014cb88
--- /dev/null
+++ b/sys/security/mac_lomac/mac_lomac.c
@@ -0,0 +1,2749 @@
+/*-
+ * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
+ * Copyright (c) 2001, 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed by Robert Watson for the TrustedBSD Project.
+ *
+ * This software was developed for the FreeBSD Project in part by NAI Labs,
+ * the Security Research Division of Network Associates, Inc. under
+ * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
+ * CHATS research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * Developed by the TrustedBSD Project.
+ * Low-watermark floating label mandatory integrity policy.
+ */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/acl.h>
+#include <sys/conf.h>
+#include <sys/extattr.h>
+#include <sys/kernel.h>
+#include <sys/mac.h>
+#include <sys/malloc.h>
+#include <sys/mount.h>
+#include <sys/proc.h>
+#include <sys/systm.h>
+#include <sys/sysproto.h>
+#include <sys/sysent.h>
+#include <sys/systm.h>
+#include <sys/vnode.h>
+#include <sys/file.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/pipe.h>
+#include <sys/sysctl.h>
+#include <sys/syslog.h>
+
+#include <fs/devfs/devfs.h>
+
+#include <net/bpfdesc.h>
+#include <net/if.h>
+#include <net/if_types.h>
+#include <net/if_var.h>
+
+#include <netinet/in.h>
+#include <netinet/ip_var.h>
+
+#include <vm/vm.h>
+
+#include <sys/mac_policy.h>
+
+#include <security/mac_lomac/mac_lomac.h>
+
+struct mac_lomac_proc {
+	struct mac_lomac mac_lomac;
+	struct mtx mtx;
+};
+
+SYSCTL_DECL(_security_mac);
+
+SYSCTL_NODE(_security_mac, OID_AUTO, lomac, CTLFLAG_RW, 0,
+    "TrustedBSD mac_lomac policy controls");
+
+static int	mac_lomac_label_size = sizeof(struct mac_lomac);
+SYSCTL_INT(_security_mac_lomac, OID_AUTO, label_size, CTLFLAG_RD,
+    &mac_lomac_label_size, 0, "Size of struct mac_lomac");
+
+static int	mac_lomac_enabled = 0;
+SYSCTL_INT(_security_mac_lomac, OID_AUTO, enabled, CTLFLAG_RW,
+    &mac_lomac_enabled, 0, "Enforce MAC/LOMAC policy");
+TUNABLE_INT("security.mac.lomac.enabled", &mac_lomac_enabled);
+
+static int	destroyed_not_inited;
+SYSCTL_INT(_security_mac_lomac, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
+    &destroyed_not_inited, 0, "Count of labels destroyed but not inited");
+
+static int	trust_all_interfaces = 0;
+SYSCTL_INT(_security_mac_lomac, OID_AUTO, trust_all_interfaces, CTLFLAG_RD,
+    &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/LOMAC");
+TUNABLE_INT("security.mac.lomac.trust_all_interfaces", &trust_all_interfaces);
+
+static char	trusted_interfaces[128];
+SYSCTL_STRING(_security_mac_lomac, OID_AUTO, trusted_interfaces, CTLFLAG_RD,
+    trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/LOMAC");
+TUNABLE_STR("security.mac.lomac.trusted_interfaces", trusted_interfaces,
+    sizeof(trusted_interfaces));
+
+static int	ptys_equal = 0;
+SYSCTL_INT(_security_mac_lomac, OID_AUTO, ptys_equal, CTLFLAG_RW,
+    &ptys_equal, 0, "Label pty devices as lomac/equal on create");
+TUNABLE_INT("security.mac.lomac.ptys_equal", &ptys_equal);
+
+static int	revocation_enabled = 1;
+SYSCTL_INT(_security_mac_lomac, OID_AUTO, revocation_enabled, CTLFLAG_RW,
+    &revocation_enabled, 0, "Revoke access to objects on relabel");
+TUNABLE_INT("security.mac.lomac.revocation_enabled", &revocation_enabled);
+
+static int	mac_lomac_slot;
+#define	SLOT(l)	((struct mac_lomac *)LABEL_TO_SLOT((l), mac_lomac_slot).l_ptr)
+#define	PSLOT(l) ((struct mac_lomac_proc *)				\
+    LABEL_TO_SLOT((l), mac_lomac_slot).l_ptr)
+
+MALLOC_DEFINE(M_MACLOMAC, "lomac label", "MAC/LOMAC labels");
+
+static struct mac_lomac *
+lomac_alloc(int flag)
+{
+	struct mac_lomac *mac_lomac;
+
+	mac_lomac = malloc(sizeof(struct mac_lomac), M_MACLOMAC, M_ZERO | flag);
+
+	return (mac_lomac);
+}
+
+static void
+lomac_free(struct mac_lomac *mac_lomac)
+{
+
+	if (mac_lomac != NULL)
+		free(mac_lomac, M_MACLOMAC);
+	else
+		atomic_add_int(&destroyed_not_inited, 1);
+}
+
+static int
+lomac_atmostflags(struct mac_lomac *mac_lomac, int flags)
+{
+
+	if ((mac_lomac->ml_flags & flags) != mac_lomac->ml_flags)
+		return (EINVAL);
+	return (0);
+}
+
+static int
+mac_lomac_dominate_element(struct mac_lomac_element *a,
+    struct mac_lomac_element *b)
+{
+
+	switch (a->mle_type) {
+	case MAC_LOMAC_TYPE_EQUAL:
+	case MAC_LOMAC_TYPE_HIGH:
+		return (1);
+
+	case MAC_LOMAC_TYPE_LOW:
+		switch (b->mle_type) {
+		case MAC_LOMAC_TYPE_GRADE:
+		case MAC_LOMAC_TYPE_HIGH:
+			return (0);
+
+		case MAC_LOMAC_TYPE_EQUAL:
+		case MAC_LOMAC_TYPE_LOW:
+			return (1);
+
+		default:
+			panic("mac_lomac_dominate_element: b->mle_type invalid");
+		}
+
+	case MAC_LOMAC_TYPE_GRADE:
+		switch (b->mle_type) {
+		case MAC_LOMAC_TYPE_EQUAL:
+		case MAC_LOMAC_TYPE_LOW:
+			return (1);
+
+		case MAC_LOMAC_TYPE_HIGH:
+			return (0);
+
+		case MAC_LOMAC_TYPE_GRADE:
+			return (a->mle_grade >= b->mle_grade);
+
+		default:
+			panic("mac_lomac_dominate_element: b->mle_type invalid");
+		}
+
+	default:
+		panic("mac_lomac_dominate_element: a->mle_type invalid");
+	}
+}
+
+static int
+mac_lomac_range_in_range(struct mac_lomac *rangea, struct mac_lomac *rangeb)
+{
+
+	return (mac_lomac_dominate_element(&rangeb->ml_rangehigh,
+	    &rangea->ml_rangehigh) &&
+	    mac_lomac_dominate_element(&rangea->ml_rangelow,
+	    &rangeb->ml_rangelow));
+}
+
+static int
+mac_lomac_single_in_range(struct mac_lomac *single, struct mac_lomac *range)
+{
+
+	KASSERT((single->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
+	    ("mac_lomac_single_in_range: a not single"));
+	KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
+	    ("mac_lomac_single_in_range: b not range"));
+
+	return (mac_lomac_dominate_element(&range->ml_rangehigh,
+	    &single->ml_single) &&
+	    mac_lomac_dominate_element(&single->ml_single,
+	    &range->ml_rangelow));
+}
+
+static int
+mac_lomac_auxsingle_in_range(struct mac_lomac *single, struct mac_lomac *range)
+{
+
+	KASSERT((single->ml_flags & MAC_LOMAC_FLAG_AUX) != 0,
+	    ("mac_lomac_single_in_range: a not auxsingle"));
+	KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
+	    ("mac_lomac_single_in_range: b not range"));
+
+	return (mac_lomac_dominate_element(&range->ml_rangehigh,
+	    &single->ml_auxsingle) &&
+	    mac_lomac_dominate_element(&single->ml_auxsingle,
+	    &range->ml_rangelow));
+
+	return (1);
+}
+
+static int
+mac_lomac_dominate_single(struct mac_lomac *a, struct mac_lomac *b)
+{
+	KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
+	    ("mac_lomac_dominate_single: a not single"));
+	KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
+	    ("mac_lomac_dominate_single: b not single"));
+
+	return (mac_lomac_dominate_element(&a->ml_single, &b->ml_single));
+}
+
+static int
+mac_lomac_subject_dominate(struct mac_lomac *a, struct mac_lomac *b)
+{
+	KASSERT((~a->ml_flags &
+	    (MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_RANGE)) == 0,
+	    ("mac_lomac_dominate_single: a not subject"));
+	KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
+	    ("mac_lomac_dominate_single: b not single"));
+
+	return (mac_lomac_dominate_element(&a->ml_rangehigh,
+	    &b->ml_single));
+}
+
+static int
+mac_lomac_equal_element(struct mac_lomac_element *a, struct mac_lomac_element *b)
+{
+
+	if (a->mle_type == MAC_LOMAC_TYPE_EQUAL ||
+	    b->mle_type == MAC_LOMAC_TYPE_EQUAL)
+		return (1);
+
+	return (a->mle_type == b->mle_type && a->mle_grade == b->mle_grade);
+}
+
+static int
+mac_lomac_equal_single(struct mac_lomac *a, struct mac_lomac *b)
+{
+
+	KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
+	    ("mac_lomac_equal_single: a not single"));
+	KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
+	    ("mac_lomac_equal_single: b not single"));
+
+	return (mac_lomac_equal_element(&a->ml_single, &b->ml_single));
+}
+
+static int
+mac_lomac_contains_equal(struct mac_lomac *mac_lomac)
+{
+
+	if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_SINGLE)
+		if (mac_lomac->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL)
+			return (1);
+	if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_AUX)
+		if (mac_lomac->ml_auxsingle.mle_type == MAC_LOMAC_TYPE_EQUAL)
+			return (1);
+
+	if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_RANGE) {
+		if (mac_lomac->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL)
+			return (1);
+		if (mac_lomac->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL)
+			return (1);
+	}
+
+	return (0);
+}
+
+static int
+mac_lomac_subject_privileged(struct mac_lomac *mac_lomac)
+{
+
+	KASSERT((mac_lomac->ml_flags & MAC_LOMAC_FLAGS_BOTH) ==
+	    MAC_LOMAC_FLAGS_BOTH,
+	    ("mac_lomac_subject_privileged: subject doesn't have both labels"));
+
+	/* If the single is EQUAL, it's ok. */
+	if (mac_lomac->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL)
+		return (0);
+
+	/* If either range endpoint is EQUAL, it's ok. */
+	if (mac_lomac->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL ||
+	    mac_lomac->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL)
+		return (0);
+
+	/* If the range is low-high, it's ok. */
+	if (mac_lomac->ml_rangelow.mle_type == MAC_LOMAC_TYPE_LOW &&
+	    mac_lomac->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_HIGH)
+		return (0);
+
+	/* It's not ok. */
+	return (EPERM);
+}
+
+static int
+mac_lomac_high_single(struct mac_lomac *mac_lomac)
+{
+
+	KASSERT((mac_lomac->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
+	    ("mac_lomac_high_single: mac_lomac not single"));
+ 
+	return (mac_lomac->ml_single.mle_type == MAC_LOMAC_TYPE_HIGH);
+}
+
+static int
+mac_lomac_valid(struct mac_lomac *mac_lomac)
+{
+
+	if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
+		switch (mac_lomac->ml_single.mle_type) {
+		case MAC_LOMAC_TYPE_GRADE:
+		case MAC_LOMAC_TYPE_EQUAL:
+		case MAC_LOMAC_TYPE_HIGH:
+		case MAC_LOMAC_TYPE_LOW:
+			break;
+
+		default:
+			return (EINVAL);
+		}
+	} else {
+		if (mac_lomac->ml_single.mle_type != MAC_LOMAC_TYPE_UNDEF)
+			return (EINVAL);
+	}
+
+	if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_AUX) {
+		switch (mac_lomac->ml_auxsingle.mle_type) {
+		case MAC_LOMAC_TYPE_GRADE:
+		case MAC_LOMAC_TYPE_EQUAL:
+		case MAC_LOMAC_TYPE_HIGH:
+		case MAC_LOMAC_TYPE_LOW:
+			break;
+
+		default:
+			return (EINVAL);
+		}
+	} else {
+		if (mac_lomac->ml_auxsingle.mle_type != MAC_LOMAC_TYPE_UNDEF)
+			return (EINVAL);
+	}
+
+	if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_RANGE) {
+		switch (mac_lomac->ml_rangelow.mle_type) {
+		case MAC_LOMAC_TYPE_GRADE:
+		case MAC_LOMAC_TYPE_EQUAL:
+		case MAC_LOMAC_TYPE_HIGH:
+		case MAC_LOMAC_TYPE_LOW:
+			break;
+
+		default:
+			return (EINVAL);
+		}
+
+		switch (mac_lomac->ml_rangehigh.mle_type) {
+		case MAC_LOMAC_TYPE_GRADE:
+		case MAC_LOMAC_TYPE_EQUAL:
+		case MAC_LOMAC_TYPE_HIGH:
+		case MAC_LOMAC_TYPE_LOW:
+			break;
+
+		default:
+			return (EINVAL);
+		}
+		if (!mac_lomac_dominate_element(&mac_lomac->ml_rangehigh,
+		    &mac_lomac->ml_rangelow))
+			return (EINVAL);
+	} else {
+		if (mac_lomac->ml_rangelow.mle_type != MAC_LOMAC_TYPE_UNDEF ||
+		    mac_lomac->ml_rangehigh.mle_type != MAC_LOMAC_TYPE_UNDEF)
+			return (EINVAL);
+	}
+
+	return (0);
+}
+
+static void
+mac_lomac_set_range(struct mac_lomac *mac_lomac, u_short typelow,
+    u_short gradelow, u_short typehigh, u_short gradehigh)
+{
+
+	mac_lomac->ml_rangelow.mle_type = typelow;
+	mac_lomac->ml_rangelow.mle_grade = gradelow;
+	mac_lomac->ml_rangehigh.mle_type = typehigh;
+	mac_lomac->ml_rangehigh.mle_grade = gradehigh;
+	mac_lomac->ml_flags |= MAC_LOMAC_FLAG_RANGE;
+}
+
+static void
+mac_lomac_set_single(struct mac_lomac *mac_lomac, u_short type, u_short grade)
+{
+
+	mac_lomac->ml_single.mle_type = type;
+	mac_lomac->ml_single.mle_grade = grade;
+	mac_lomac->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
+}
+
+static void
+mac_lomac_set_auxsingle(struct mac_lomac *mac_lomac, u_short type,
+    u_short grade)
+{
+
+	mac_lomac->ml_auxsingle.mle_type = type;
+	mac_lomac->ml_auxsingle.mle_grade = grade;
+	mac_lomac->ml_flags |= MAC_LOMAC_FLAG_AUX;
+}
+
+static void
+mac_lomac_copy_range(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
+{
+
+	KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
+	    ("mac_lomac_copy_range: labelfrom not range"));
+
+	labelto->ml_rangelow = labelfrom->ml_rangelow;
+	labelto->ml_rangehigh = labelfrom->ml_rangehigh;
+	labelto->ml_flags |= MAC_LOMAC_FLAG_RANGE;
+}
+
+static void
+mac_lomac_copy_single(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
+{
+
+	KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
+	    ("mac_lomac_copy_single: labelfrom not single"));
+
+	labelto->ml_single = labelfrom->ml_single;
+	labelto->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
+}
+
+static void
+mac_lomac_copy_auxsingle(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
+{
+
+	KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_AUX) != 0,
+	    ("mac_lomac_copy_auxsingle: labelfrom not auxsingle"));
+
+	labelto->ml_auxsingle = labelfrom->ml_auxsingle;
+	labelto->ml_flags |= MAC_LOMAC_FLAG_AUX;
+}
+
+static void
+mac_lomac_copy(struct mac_lomac *source, struct mac_lomac *dest)
+{
+
+	if (source->ml_flags & MAC_LOMAC_FLAG_SINGLE)
+		mac_lomac_copy_single(source, dest);
+	if (source->ml_flags & MAC_LOMAC_FLAG_AUX)
+		mac_lomac_copy_auxsingle(source, dest);
+	if (source->ml_flags & MAC_LOMAC_FLAG_RANGE)
+		mac_lomac_copy_range(source, dest);
+}
+
+static int	mac_lomac_to_string(char *string, size_t size,
+	    size_t *caller_len, struct mac_lomac *mac_lomac);
+
+static int
+maybe_demote(struct mac_lomac *subjlabel, struct mac_lomac *objlabel,
+    const char *actionname, const char *objname, struct vnode *vpq)
+{
+	struct vattr va;
+	static const char xxx[] = "<<XXX>>";
+	struct mac_lomac_proc *subj = PSLOT(&curthread->td_proc->p_label);
+	char *subjlabeltext, *objlabeltext, *subjtext, *text;
+	struct proc *p;
+	size_t len;
+	pid_t pgid;
+
+	p = curthread->td_proc;
+	mtx_lock(&subj->mtx);
+        if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) {
+		/*
+		 * Check to see if the pending demotion would be more or
+		 * less severe than this one, and keep the more severe.
+		 * This can only happen for a multi-threaded application.
+		 */
+		if (mac_lomac_dominate_single(objlabel, &subj->mac_lomac)) {
+			mtx_unlock(&subj->mtx);
+			return (0);
+		}
+	}
+	bzero(&subj->mac_lomac, sizeof(subj->mac_lomac));
+	/*
+	 * Always demote the single label.
+	 */
+	mac_lomac_copy_single(objlabel, &subj->mac_lomac);
+	/*
+	 * Start with the original range, then minimize each side of
+	 * the range to the point of not dominating the object.  The
+	 * high side will always be demoted, of course.
+	 */
+	mac_lomac_copy_range(subjlabel, &subj->mac_lomac);
+	if (!mac_lomac_dominate_element(&objlabel->ml_single,
+	    &subj->mac_lomac.ml_rangelow))
+		subj->mac_lomac.ml_rangelow = objlabel->ml_single;
+	subj->mac_lomac.ml_rangehigh = objlabel->ml_single;
+	subj->mac_lomac.ml_flags |= MAC_LOMAC_FLAG_UPDATE;
+	mtx_lock_spin(&sched_lock);
+	curthread->td_kse->ke_flags |= KEF_ASTPENDING;
+	curthread->td_proc->p_sflag |= PS_MACPEND;
+	mtx_unlock_spin(&sched_lock);
+	subjtext = subjlabeltext = objlabeltext = xxx;
+	if (mac_lomac_to_string(NULL, 0, &len, &subj->mac_lomac) == 0 &&
+	    (text = malloc(len + 1, M_MACLOMAC, M_NOWAIT)) != NULL) {
+		if (mac_lomac_to_string(text, len + 1, &len,
+		    &subj->mac_lomac) == 0)
+			subjtext = text;
+		else
+			free(text, M_MACLOMAC);
+	}
+	mtx_unlock(&subj->mtx);
+	if (mac_lomac_to_string(NULL, 0, &len, subjlabel) == 0 &&
+	    (text = malloc(len + 1, M_MACLOMAC, M_NOWAIT)) != NULL) {
+		if (mac_lomac_to_string(text, len + 1, &len,
+		    subjlabel) == 0)
+			subjlabeltext = text;
+		else
+			free(text, M_MACLOMAC);
+	}
+	if (mac_lomac_to_string(NULL, 0, &len, objlabel) == 0 &&
+	    (text = malloc(len + 1, M_MACLOMAC, M_NOWAIT)) != NULL) {
+		if (mac_lomac_to_string(text, len + 1, &len,
+		    objlabel) == 0)
+			objlabeltext = text;
+		else
+			free(text, M_MACLOMAC);
+	}
+	pgid = p->p_pgrp->pg_id;		/* XXX could be stale? */
+	if (vpq != NULL && VOP_GETATTR(vpq, &va, curthread->td_ucred,
+	    curthread) == 0) {
+		log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to"
+		    " level %s after %s a level-%s %s (inode=%ld, "
+		    "mountpount=%s)\n",
+		    subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid,
+		    p->p_comm, subjtext, actionname, objlabeltext, objname,
+		    va.va_fileid, vpq->v_mount->mnt_stat.f_mntonname);
+	} else {
+		log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to"
+		    " level %s after %s a level-%s %s\n",
+		    subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid,
+		    p->p_comm, subjtext, actionname, objlabeltext, objname);
+	}
+		
+	if (subjlabeltext != xxx)
+		free(subjlabeltext, M_MACLOMAC);
+	if (objlabeltext != xxx)
+		free(objlabeltext, M_MACLOMAC);
+	if (subjtext != xxx)
+		free(subjtext, M_MACLOMAC);
+	return (0);
+}
+
+/*
+ * Relabel "to" to "from" only if "from" is a valid label (contains
+ * at least a single), as for a relabel operation which may or may
+ * not involve a relevant label.
+ */
+void
+try_relabel(struct mac_lomac *from, struct mac_lomac *to)
+{
+
+	if (from->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
+		bzero(to, sizeof(*to));
+		mac_lomac_copy(from, to);
+	}
+}
+
+/*
+ * Policy module operations.
+ */
+static void
+mac_lomac_destroy(struct mac_policy_conf *conf)
+{
+
+}
+
+static void
+mac_lomac_init(struct mac_policy_conf *conf)
+{
+
+}
+
+/*
+ * Label operations.
+ */
+static void
+mac_lomac_init_label(struct label *label)
+{
+
+	SLOT(label) = lomac_alloc(M_WAITOK);
+}
+
+static int
+mac_lomac_init_label_waitcheck(struct label *label, int flag)
+{
+
+	SLOT(label) = lomac_alloc(flag);
+	if (SLOT(label) == NULL)
+		return (ENOMEM);
+
+	return (0);
+}
+
+static void
+mac_lomac_init_proc_label(struct label *label)
+{
+
+	PSLOT(label) = malloc(sizeof(struct mac_lomac_proc), M_MACLOMAC,
+	    M_ZERO | M_WAITOK);
+	mtx_init(&PSLOT(label)->mtx, "MAC/Lomac proc lock", NULL, MTX_DEF);
+}
+
+static void
+mac_lomac_destroy_label(struct label *label)
+{
+
+	lomac_free(SLOT(label));
+	SLOT(label) = NULL;
+}
+
+static void
+mac_lomac_destroy_proc_label(struct label *label)
+{
+
+	mtx_destroy(&PSLOT(label)->mtx);
+	FREE(PSLOT(label), M_MACLOMAC);
+	PSLOT(label) = NULL;
+}
+
+/*
+ * mac_lomac_element_to_string() is basically an snprintf wrapper with
+ * the same properties as snprintf().  It returns the length it would
+ * have added to the string in the event the string is too short.
+ */
+static size_t
+mac_lomac_element_to_string(char *string, size_t size,
+    struct mac_lomac_element *element)
+{
+
+	switch (element->mle_type) {
+	case MAC_LOMAC_TYPE_HIGH:
+		return (snprintf(string, size, "high"));
+
+	case MAC_LOMAC_TYPE_LOW:
+		return (snprintf(string, size, "low"));
+
+	case MAC_LOMAC_TYPE_EQUAL:
+		return (snprintf(string, size, "equal"));
+
+	case MAC_LOMAC_TYPE_GRADE:
+		return (snprintf(string, size, "%d", element->mle_grade));
+
+	default:
+		panic("mac_lomac_element_to_string: invalid type (%d)",
+		    element->mle_type);
+	}
+}
+
+static int
+mac_lomac_to_string(char *string, size_t size, size_t *caller_len,
+    struct mac_lomac *mac_lomac)
+{
+	size_t left, len, curlen;
+	char *curptr;
+
+	/*
+	 * Also accept NULL string to allow for predetermination of total
+	 * string length.
+	 */
+	if (string != NULL)
+		bzero(string, size);
+	else if (size != 0)
+		return (EINVAL);
+	curptr = string;
+	left = size;
+	curlen = 0;
+
+#define	INCLEN(length, leftover) do {					\
+	if (string != NULL) {						\
+		if (length >= leftover)					\
+			return (EINVAL);				\
+		leftover -= length;					\
+		curptr += length;					\
+	}								\
+	curlen += length;						\
+} while (0)
+	if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
+		len = mac_lomac_element_to_string(curptr, left,
+		    &mac_lomac->ml_single);
+		INCLEN(len, left);
+	}
+
+	if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_AUX) {
+		len = snprintf(curptr, left, "[");
+		INCLEN(len, left);
+
+		len = mac_lomac_element_to_string(curptr, left,
+		    &mac_lomac->ml_auxsingle);
+		INCLEN(len, left);
+
+		len = snprintf(curptr, left, "]");
+		INCLEN(len, left);
+	}
+
+	if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_RANGE) {
+		len = snprintf(curptr, left, "(");
+		INCLEN(len, left);
+
+		len = mac_lomac_element_to_string(curptr, left,
+		    &mac_lomac->ml_rangelow);
+		INCLEN(len, left);
+
+		len = snprintf(curptr, left, "-");
+		INCLEN(len, left);
+
+		len = mac_lomac_element_to_string(curptr, left,
+		    &mac_lomac->ml_rangehigh);
+		INCLEN(len, left);
+
+		len = snprintf(curptr, left, ")");
+		INCLEN(len, left);
+	}
+#undef INCLEN
+
+	*caller_len = curlen;
+	return (0);
+}
+
+static int
+mac_lomac_externalize_label(struct label *label, char *element_name,
+    char *element_data, size_t size, size_t *len, int *claimed)
+{
+	struct mac_lomac *mac_lomac;
+	int error;
+
+	if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0)
+		return (0);
+
+	(*claimed)++;
+
+	mac_lomac = SLOT(label);
+	error = mac_lomac_to_string(element_data, size, len, mac_lomac);
+	if (error)
+		return (error);
+
+	*len = strlen(element_data);
+	return (0);
+}
+
+static int
+mac_lomac_parse_element(struct mac_lomac_element *element, char *string)
+{
+
+	if (strcmp(string, "high") == 0 ||
+	    strcmp(string, "hi") == 0) {
+		element->mle_type = MAC_LOMAC_TYPE_HIGH;
+		element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
+	} else if (strcmp(string, "low") == 0 ||
+	    strcmp(string, "lo") == 0) {
+		element->mle_type = MAC_LOMAC_TYPE_LOW;
+		element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
+	} else if (strcmp(string, "equal") == 0 ||
+	    strcmp(string, "eq") == 0) {
+		element->mle_type = MAC_LOMAC_TYPE_EQUAL;
+		element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
+	} else {
+		char *p0, *p1;
+		int d;
+
+		p0 = string;
+		d = strtol(p0, &p1, 10);
+	
+		if (d < 0 || d > 65535)
+			return (EINVAL);
+		element->mle_type = MAC_LOMAC_TYPE_GRADE;
+		element->mle_grade = d;
+
+		if (p1 == p0 || *p1 != '\0')
+			return (EINVAL);
+	}
+
+	return (0);
+}
+
+/*
+ * Note: destructively consumes the string, make a local copy before
+ * calling if that's a problem.
+ */
+static int
+mac_lomac_parse(struct mac_lomac *mac_lomac, char *string)
+{
+	char *range, *rangeend, *rangehigh, *rangelow, *single, *auxsingle,
+	    *auxsingleend;
+	int error;
+
+	/* Do we have a range? */
+	single = string;
+	range = index(string, '(');
+	if (range == single)
+		single = NULL;
+	auxsingle = index(string, '[');
+	if (auxsingle == single)
+		single = NULL;
+	if (range != NULL && auxsingle != NULL)
+		return (EINVAL);
+	rangelow = rangehigh = NULL;
+	if (range != NULL) {
+		/* Nul terminate the end of the single string. */
+		*range = '\0';
+		range++;
+		rangelow = range;
+		rangehigh = index(rangelow, '-');
+		if (rangehigh == NULL)
+			return (EINVAL);
+		rangehigh++;
+		if (*rangelow == '\0' || *rangehigh == '\0')
+			return (EINVAL);
+		rangeend = index(rangehigh, ')');
+		if (rangeend == NULL)
+			return (EINVAL);
+		if (*(rangeend + 1) != '\0')
+			return (EINVAL);
+		/* Nul terminate the ends of the ranges. */
+		*(rangehigh - 1) = '\0';
+		*rangeend = '\0';
+	}
+	KASSERT((rangelow != NULL && rangehigh != NULL) ||
+	    (rangelow == NULL && rangehigh == NULL),
+	    ("mac_lomac_internalize_label: range mismatch"));
+	if (auxsingle != NULL) {
+		/* Nul terminate the end of the single string. */
+		*auxsingle = '\0';
+		auxsingle++;
+		auxsingleend = index(auxsingle, ']');
+		if (auxsingleend == NULL)
+			return (EINVAL);
+		if (*(auxsingleend + 1) != '\0')
+			return (EINVAL);
+		/* Nul terminate the end of the auxsingle. */
+		*auxsingleend = '\0';
+	}
+
+	bzero(mac_lomac, sizeof(*mac_lomac));
+	if (single != NULL) {
+		error = mac_lomac_parse_element(&mac_lomac->ml_single, single);
+		if (error)
+			return (error);
+		mac_lomac->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
+	}
+
+	if (auxsingle != NULL) {
+		error = mac_lomac_parse_element(&mac_lomac->ml_auxsingle,
+		    auxsingle);
+		if (error)
+			return (error);
+		mac_lomac->ml_flags |= MAC_LOMAC_FLAG_AUX;
+	}
+
+	if (rangelow != NULL) {
+		error = mac_lomac_parse_element(&mac_lomac->ml_rangelow,
+		    rangelow);
+		if (error)
+			return (error);
+		error = mac_lomac_parse_element(&mac_lomac->ml_rangehigh,
+		    rangehigh);
+		if (error)
+			return (error);
+		mac_lomac->ml_flags |= MAC_LOMAC_FLAG_RANGE;
+	}
+
+	error = mac_lomac_valid(mac_lomac);
+	if (error)
+		return (error);
+
+	return (0);
+}
+
+static int
+mac_lomac_internalize_label(struct label *label, char *element_name,
+    char *element_data, int *claimed)
+{
+	struct mac_lomac *mac_lomac, mac_lomac_temp;
+	int error;
+
+	if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0)
+		return (0);
+
+	(*claimed)++;
+
+	error = mac_lomac_parse(&mac_lomac_temp, element_data);
+	if (error)
+		return (error);
+
+	mac_lomac = SLOT(label);
+	*mac_lomac = mac_lomac_temp;
+
+	return (0);
+}
+
+static void
+mac_lomac_copy_label(struct label *src, struct label *dest)
+{
+
+	*SLOT(dest) = *SLOT(src);
+}
+
+/*
+ * Labeling event operations: file system objects, and things that look
+ * a lot like file system objects.
+ */
+static void
+mac_lomac_create_devfs_device(dev_t dev, struct devfs_dirent *devfs_dirent,
+    struct label *label)
+{
+	struct mac_lomac *mac_lomac;
+	int lomac_type;
+
+	mac_lomac = SLOT(label);
+	if (strcmp(dev->si_name, "null") == 0 ||
+	    strcmp(dev->si_name, "zero") == 0 ||
+	    strcmp(dev->si_name, "random") == 0 ||
+	    strncmp(dev->si_name, "fd/", strlen("fd/")) == 0 ||
+	    strncmp(dev->si_name, "ttyv", strlen("ttyv")) == 0)
+		lomac_type = MAC_LOMAC_TYPE_EQUAL;
+	else if (ptys_equal &&
+	    (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 ||
+	    strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0))
+		lomac_type = MAC_LOMAC_TYPE_EQUAL;
+	else
+		lomac_type = MAC_LOMAC_TYPE_HIGH;
+	mac_lomac_set_single(mac_lomac, lomac_type, 0);
+}
+
+static void
+mac_lomac_create_devfs_directory(char *dirname, int dirnamelen,
+    struct devfs_dirent *devfs_dirent, struct label *label)
+{
+	struct mac_lomac *mac_lomac;
+
+	mac_lomac = SLOT(label);
+	mac_lomac_set_single(mac_lomac, MAC_LOMAC_TYPE_HIGH, 0);
+}
+
+static void
+mac_lomac_create_devfs_symlink(struct ucred *cred, struct devfs_dirent *dd,
+    struct label *ddlabel, struct devfs_dirent *de, struct label *delabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(&cred->cr_label);
+	dest = SLOT(delabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static void
+mac_lomac_create_mount(struct ucred *cred, struct mount *mp,
+    struct label *mntlabel, struct label *fslabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(&cred->cr_label);
+	dest = SLOT(mntlabel);
+	mac_lomac_copy_single(source, dest);
+	dest = SLOT(fslabel);
+	mac_lomac_copy_single(source, dest);
+}
+
+static void
+mac_lomac_create_root_mount(struct ucred *cred, struct mount *mp,
+    struct label *mntlabel, struct label *fslabel)
+{
+	struct mac_lomac *mac_lomac;
+
+	/* Always mount root as high integrity. */
+	mac_lomac = SLOT(fslabel);
+	mac_lomac_set_single(mac_lomac, MAC_LOMAC_TYPE_HIGH, 0);
+	mac_lomac = SLOT(mntlabel);
+	mac_lomac_set_single(mac_lomac, MAC_LOMAC_TYPE_HIGH, 0);
+}
+
+static void
+mac_lomac_relabel_vnode(struct ucred *cred, struct vnode *vp,
+    struct label *vnodelabel, struct label *label)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(label);
+	dest = SLOT(vnodelabel);
+
+	try_relabel(source, dest);
+}
+
+static void
+mac_lomac_update_devfsdirent(struct devfs_dirent *devfs_dirent,
+    struct label *direntlabel, struct vnode *vp, struct label *vnodelabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(vnodelabel);
+	dest = SLOT(direntlabel);
+
+	mac_lomac_copy(source, dest);
+}
+
+static void
+mac_lomac_associate_vnode_devfs(struct mount *mp, struct label *fslabel,
+    struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
+    struct label *vlabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(delabel);
+	dest = SLOT(vlabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static int
+mac_lomac_associate_vnode_extattr(struct mount *mp, struct label *fslabel,
+    struct vnode *vp, struct label *vlabel)
+{
+	struct mac_lomac temp, *source, *dest;
+	size_t buflen;
+	int error;
+
+	source = SLOT(fslabel);
+	dest = SLOT(vlabel);
+
+	buflen = sizeof(temp);
+	bzero(&temp, buflen);
+
+	error = vn_extattr_get(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
+	    MAC_LOMAC_EXTATTR_NAME, &buflen, (char *)&temp, curthread);
+	if (error == ENOATTR || error == EOPNOTSUPP) {
+		/* Fall back to the fslabel. */
+		mac_lomac_copy_single(source, dest);
+		return (0);
+	} else if (error)
+		return (error);
+
+	if (buflen != sizeof(temp)) {
+		if (buflen != sizeof(temp) - sizeof(temp.ml_auxsingle)) {
+			printf("mac_lomac_associate_vnode_extattr: bad size %d\n",
+			    buflen);
+			return (EPERM);
+		}
+		bzero(&temp.ml_auxsingle, sizeof(temp.ml_auxsingle));
+		buflen = sizeof(temp);
+		(void)vn_extattr_set(vp, IO_NODELOCKED,
+		    MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME,
+		    buflen, (char *)&temp, curthread);
+	}
+	if (mac_lomac_valid(&temp) != 0) {
+		printf("mac_lomac_associate_vnode_extattr: invalid\n");
+		return (EPERM);
+	}
+	if ((temp.ml_flags & MAC_LOMAC_FLAGS_BOTH) != MAC_LOMAC_FLAG_SINGLE) {
+		printf("mac_lomac_associate_vnode_extattr: not single\n");
+		return (EPERM);
+	}
+
+	mac_lomac_copy_single(&temp, dest);
+	return (0);
+}
+
+static void
+mac_lomac_associate_vnode_singlelabel(struct mount *mp,
+    struct label *fslabel, struct vnode *vp, struct label *vlabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(fslabel);
+	dest = SLOT(vlabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static int
+mac_lomac_create_vnode_extattr(struct ucred *cred, struct mount *mp,
+    struct label *fslabel, struct vnode *dvp, struct label *dlabel,
+    struct vnode *vp, struct label *vlabel, struct componentname *cnp)
+{
+	struct mac_lomac *source, *dest, *dir, temp;
+	size_t buflen;
+	int error;
+
+	buflen = sizeof(temp);
+	bzero(&temp, buflen);
+
+	source = SLOT(&cred->cr_label);
+	dest = SLOT(vlabel);
+	dir = SLOT(dlabel);
+	if (dir->ml_flags & MAC_LOMAC_FLAG_AUX) {
+		mac_lomac_copy_auxsingle(dir, &temp);
+		mac_lomac_set_single(&temp, dir->ml_auxsingle.mle_type,
+		    dir->ml_auxsingle.mle_grade);
+	} else {
+		mac_lomac_copy_single(source, &temp);
+	}
+
+	error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
+	    MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread);
+	if (error == 0)
+		mac_lomac_copy(&temp, dest);
+	return (error);
+}
+
+static int
+mac_lomac_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp,
+    struct label *vlabel, struct label *intlabel)
+{
+	struct mac_lomac *source, temp;
+	size_t buflen;
+	int error;
+
+	buflen = sizeof(temp);
+	bzero(&temp, buflen);
+
+	source = SLOT(intlabel);
+	if ((source->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
+		return (0);
+
+	mac_lomac_copy_single(source, &temp);
+	error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
+	    MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread);
+	return (error);
+}
+
+/*
+ * Labeling event operations: IPC object.
+ */
+static void
+mac_lomac_create_mbuf_from_socket(struct socket *so, struct label *socketlabel,
+    struct mbuf *m, struct label *mbuflabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(socketlabel);
+	dest = SLOT(mbuflabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static void
+mac_lomac_create_socket(struct ucred *cred, struct socket *socket,
+    struct label *socketlabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(&cred->cr_label);
+	dest = SLOT(socketlabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static void
+mac_lomac_create_pipe(struct ucred *cred, struct pipe *pipe,
+    struct label *pipelabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(&cred->cr_label);
+	dest = SLOT(pipelabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static void
+mac_lomac_create_socket_from_socket(struct socket *oldsocket,
+    struct label *oldsocketlabel, struct socket *newsocket,
+    struct label *newsocketlabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(oldsocketlabel);
+	dest = SLOT(newsocketlabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static void
+mac_lomac_relabel_socket(struct ucred *cred, struct socket *socket,
+    struct label *socketlabel, struct label *newlabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(newlabel);
+	dest = SLOT(socketlabel);
+
+	try_relabel(source, dest);
+}
+
+static void
+mac_lomac_relabel_pipe(struct ucred *cred, struct pipe *pipe,
+    struct label *pipelabel, struct label *newlabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(newlabel);
+	dest = SLOT(pipelabel);
+
+	try_relabel(source, dest);
+}
+
+static void
+mac_lomac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct label *mbuflabel,
+    struct socket *socket, struct label *socketpeerlabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(mbuflabel);
+	dest = SLOT(socketpeerlabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+/*
+ * Labeling event operations: network objects.
+ */
+static void
+mac_lomac_set_socket_peer_from_socket(struct socket *oldsocket,
+    struct label *oldsocketlabel, struct socket *newsocket,
+    struct label *newsocketpeerlabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(oldsocketlabel);
+	dest = SLOT(newsocketpeerlabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static void
+mac_lomac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d,
+    struct label *bpflabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(&cred->cr_label);
+	dest = SLOT(bpflabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static void
+mac_lomac_create_ifnet(struct ifnet *ifnet, struct label *ifnetlabel)
+{
+	char tifname[IFNAMSIZ], ifname[IFNAMSIZ], *p, *q;
+	char tiflist[sizeof(trusted_interfaces)];
+	struct mac_lomac *dest;
+	int len, grade;
+
+	dest = SLOT(ifnetlabel);
+
+	if (ifnet->if_type == IFT_LOOP) {
+		grade = MAC_LOMAC_TYPE_EQUAL;
+		goto set;
+	}
+
+	if (trust_all_interfaces) {
+		grade = MAC_LOMAC_TYPE_HIGH;
+		goto set;
+	}
+
+	grade = MAC_LOMAC_TYPE_LOW;
+
+	if (trusted_interfaces[0] == '\0' ||
+	    !strvalid(trusted_interfaces, sizeof(trusted_interfaces)))
+		goto set;
+
+	bzero(tiflist, sizeof(tiflist));
+	for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++)
+		if(*p != ' ' && *p != '\t')
+			*q = *p;
+
+	snprintf(ifname, IFNAMSIZ, "%s%d", ifnet->if_name, ifnet->if_unit);
+
+	for (p = q = tiflist;; p++) {
+		if (*p == ',' || *p == '\0') {
+			len = p - q;
+			if (len < IFNAMSIZ) {
+				bzero(tifname, sizeof(tifname));
+				bcopy(q, tifname, len);
+				if (strcmp(tifname, ifname) == 0) {
+					grade = MAC_LOMAC_TYPE_HIGH;
+					break;
+				}
+			}
+			else {
+				*p = '\0';
+				printf("MAC/LOMAC warning: interface name "
+				    "\"%s\" is too long (must be < %d)\n",
+				    q, IFNAMSIZ);
+			}
+			if (*p == '\0')
+				break;
+			q = p + 1;
+		}
+	}
+set:
+	mac_lomac_set_single(dest, grade, 0);
+	mac_lomac_set_range(dest, grade, 0, grade, 0);
+}
+
+static void
+mac_lomac_create_ipq(struct mbuf *fragment, struct label *fragmentlabel,
+    struct ipq *ipq, struct label *ipqlabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(fragmentlabel);
+	dest = SLOT(ipqlabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static void
+mac_lomac_create_datagram_from_ipq(struct ipq *ipq, struct label *ipqlabel,
+    struct mbuf *datagram, struct label *datagramlabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(ipqlabel);
+	dest = SLOT(datagramlabel);
+
+	/* Just use the head, since we require them all to match. */
+	mac_lomac_copy_single(source, dest);
+}
+
+static void
+mac_lomac_create_fragment(struct mbuf *datagram, struct label *datagramlabel,
+    struct mbuf *fragment, struct label *fragmentlabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(datagramlabel);
+	dest = SLOT(fragmentlabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static void
+mac_lomac_create_mbuf_from_mbuf(struct mbuf *oldmbuf,
+    struct label *oldmbuflabel, struct mbuf *newmbuf,
+    struct label *newmbuflabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(oldmbuflabel);
+	dest = SLOT(newmbuflabel);
+
+	/*
+	 * Because the source mbuf may not yet have been "created",
+	 * just initialized, we do a conditional copy.  Since we don't
+	 * allow mbufs to have ranges, do a KASSERT to make sure that
+	 * doesn't happen.
+	 */
+	KASSERT((source->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0,
+	    ("mac_lomac_create_mbuf_from_mbuf: source mbuf has range"));
+	mac_lomac_copy(source, dest);
+}
+
+static void
+mac_lomac_create_mbuf_linklayer(struct ifnet *ifnet, struct label *ifnetlabel,
+    struct mbuf *mbuf, struct label *mbuflabel)
+{
+	struct mac_lomac *dest;
+
+	dest = SLOT(mbuflabel);
+
+	mac_lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
+}
+
+static void
+mac_lomac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct label *bpflabel,
+    struct mbuf *mbuf, struct label *mbuflabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(bpflabel);
+	dest = SLOT(mbuflabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static void
+mac_lomac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct label *ifnetlabel,
+    struct mbuf *m, struct label *mbuflabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(ifnetlabel);
+	dest = SLOT(mbuflabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static void
+mac_lomac_create_mbuf_multicast_encap(struct mbuf *oldmbuf,
+    struct label *oldmbuflabel, struct ifnet *ifnet, struct label *ifnetlabel,
+    struct mbuf *newmbuf, struct label *newmbuflabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(oldmbuflabel);
+	dest = SLOT(newmbuflabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static void
+mac_lomac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct label *oldmbuflabel,
+    struct mbuf *newmbuf, struct label *newmbuflabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(oldmbuflabel);
+	dest = SLOT(newmbuflabel);
+
+	mac_lomac_copy_single(source, dest);
+}
+
+static int
+mac_lomac_fragment_match(struct mbuf *fragment, struct label *fragmentlabel,
+    struct ipq *ipq, struct label *ipqlabel)
+{
+	struct mac_lomac *a, *b;
+
+	a = SLOT(ipqlabel);
+	b = SLOT(fragmentlabel);
+
+	return (mac_lomac_equal_single(a, b));
+}
+
+static void
+mac_lomac_relabel_ifnet(struct ucred *cred, struct ifnet *ifnet,
+    struct label *ifnetlabel, struct label *newlabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(newlabel);
+	dest = SLOT(ifnetlabel);
+
+	try_relabel(source, dest);
+}
+
+static void
+mac_lomac_update_ipq(struct mbuf *fragment, struct label *fragmentlabel,
+    struct ipq *ipq, struct label *ipqlabel)
+{
+
+	/* NOOP: we only accept matching labels, so no need to update */
+}
+
+/*
+ * Labeling event operations: processes.
+ */
+static void
+mac_lomac_create_cred(struct ucred *cred_parent, struct ucred *cred_child)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(&cred_parent->cr_label);
+	dest = SLOT(&cred_child->cr_label);
+
+	mac_lomac_copy_single(source, dest);
+	mac_lomac_copy_range(source, dest);
+}
+
+static void
+mac_lomac_execve_transition(struct ucred *old, struct ucred *new,
+    struct vnode *vp, struct label *vnodelabel,
+    struct label *interpvnodelabel, struct image_params *imgp,
+    struct label *execlabel)
+{
+	struct mac_lomac *source, *dest, *obj, *robj;
+
+	source = SLOT(&old->cr_label);
+	dest = SLOT(&new->cr_label);
+	obj = SLOT(vnodelabel);
+	robj = interpvnodelabel != NULL ? SLOT(interpvnodelabel) : obj;
+
+	mac_lomac_copy(source, dest);
+	/*
+	 * If there's an auxiliary label on the real object, respect it
+	 * and assume that this level should be assumed immediately if
+	 * a higher level is currently in place.
+	 */
+	if (robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
+	    !mac_lomac_dominate_element(&robj->ml_auxsingle, &dest->ml_single)
+	    && mac_lomac_auxsingle_in_range(robj, dest))
+		mac_lomac_set_single(dest, robj->ml_auxsingle.mle_type,
+		    robj->ml_auxsingle.mle_grade);
+	/*
+	 * Restructuring to use the execve transitioning mechanism
+	 * instead of the normal demotion mechanism here would be
+	 * difficult, so just copy the label over and perform standard
+	 * demotion.  This is also non-optimal because it will result
+	 * in the intermediate label "new" being created and immediately
+	 * recycled.
+	 */
+	if (mac_lomac_enabled && revocation_enabled &&
+	    !mac_lomac_dominate_single(obj, source))
+		(void)maybe_demote(source, obj, "executing", "file", vp);
+}
+
+static int
+mac_lomac_execve_will_transition(struct ucred *old, struct vnode *vp,
+    struct label *vnodelabel, struct label *interpvnodelabel,
+    struct image_params *imgp, struct label *execlabel)
+{
+	struct mac_lomac *subj, *obj, *robj;
+
+	if (!mac_lomac_enabled || !revocation_enabled)
+		return (0);
+
+	subj = SLOT(&old->cr_label);
+	obj = SLOT(vnodelabel);
+	robj = interpvnodelabel != NULL ? SLOT(interpvnodelabel) : obj;
+
+	return ((robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
+	    !mac_lomac_dominate_element(&robj->ml_auxsingle, &subj->ml_single)
+	    && mac_lomac_auxsingle_in_range(robj, subj)) ||
+	    !mac_lomac_dominate_single(obj, subj));
+}
+
+static void
+mac_lomac_create_proc0(struct ucred *cred)
+{
+	struct mac_lomac *dest;
+
+	dest = SLOT(&cred->cr_label);
+
+	mac_lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
+	mac_lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH,
+	    0);
+}
+
+static void
+mac_lomac_create_proc1(struct ucred *cred)
+{
+	struct mac_lomac *dest;
+
+	dest = SLOT(&cred->cr_label);
+
+	mac_lomac_set_single(dest, MAC_LOMAC_TYPE_HIGH, 0);
+	mac_lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH,
+	    0);
+}
+
+static void
+mac_lomac_relabel_cred(struct ucred *cred, struct label *newlabel)
+{
+	struct mac_lomac *source, *dest;
+
+	source = SLOT(newlabel);
+	dest = SLOT(&cred->cr_label);
+
+	try_relabel(source, dest);
+}
+
+/*
+ * Access control checks.
+ */
+static int
+mac_lomac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct label *bpflabel,
+    struct ifnet *ifnet, struct label *ifnetlabel)
+{
+	struct mac_lomac *a, *b;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	a = SLOT(bpflabel);
+	b = SLOT(ifnetlabel);
+
+	if (mac_lomac_equal_single(a, b))
+		return (0);
+	return (EACCES);
+}
+
+static int
+mac_lomac_check_cred_relabel(struct ucred *cred, struct label *newlabel)
+{
+	struct mac_lomac *subj, *new;
+	int error;
+
+	subj = SLOT(&cred->cr_label);
+	new = SLOT(newlabel);
+
+	/*
+	 * If there is a LOMAC label update for the credential, it may
+	 * be an update of the single, range, or both.
+	 */
+	error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH);
+	if (error)
+		return (error);
+
+	/*
+	 * If the LOMAC label is to be changed, authorize as appropriate.
+	 */
+	if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) {
+		/*
+		 * To change the LOMAC single label on a credential, the
+		 * new single label must be in the current range.
+		 */
+		if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE &&
+		    !mac_lomac_single_in_range(new, subj))
+			return (EPERM);
+
+		/*
+		 * To change the LOMAC range on a credential, the new
+		 * range label must be in the current range.
+		 */
+		if (new->ml_flags & MAC_LOMAC_FLAG_RANGE &&
+		    !mac_lomac_range_in_range(new, subj))
+			return (EPERM);
+
+		/*
+		 * To have EQUAL in any component of the new credential
+		 * LOMAC label, the subject must already have EQUAL in
+		 * their label.
+		 */
+		if (mac_lomac_contains_equal(new)) {
+			error = mac_lomac_subject_privileged(subj);
+			if (error)
+				return (error);
+		}
+
+		/*
+		 * XXXMAC: Additional consistency tests regarding the
+		 * single and range of the new label might be performed
+		 * here.
+		 */
+	}
+
+	return (0);
+}
+
+static int
+mac_lomac_check_cred_visible(struct ucred *u1, struct ucred *u2)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&u1->cr_label);
+	obj = SLOT(&u2->cr_label);
+
+	/* XXX: range */
+	if (!mac_lomac_dominate_single(obj, subj))
+		return (ESRCH);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_ifnet_relabel(struct ucred *cred, struct ifnet *ifnet,
+    struct label *ifnetlabel, struct label *newlabel)
+{
+	struct mac_lomac *subj, *new;
+	int error;
+
+	subj = SLOT(&cred->cr_label);
+	new = SLOT(newlabel);
+
+	/*
+	 * If there is a LOMAC label update for the interface, it may
+	 * be an update of the single, range, or both.
+	 */
+	error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH);
+	if (error)
+		return (error);
+
+	/*
+	 * Relabling network interfaces requires LOMAC privilege.
+	 */
+	error = mac_lomac_subject_privileged(subj);
+	if (error)
+		return (error);
+
+	/*
+	 * If the LOMAC label is to be changed, authorize as appropriate.
+	 */
+	if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) {
+		/*
+		 * Rely on the traditional superuser status for the LOMAC
+		 * interface relabel requirements.  XXXMAC: This will go
+		 * away.
+		 */
+		error = suser_cred(cred, 0);
+		if (error)
+			return (EPERM);
+
+		/*
+		 * XXXMAC: Additional consistency tests regarding the single
+		 * and the range of the new label might be performed here.
+		 */
+	}
+
+	return (0);
+}
+
+static int
+mac_lomac_check_ifnet_transmit(struct ifnet *ifnet, struct label *ifnetlabel,
+    struct mbuf *m, struct label *mbuflabel)
+{
+	struct mac_lomac *p, *i;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	p = SLOT(mbuflabel);
+	i = SLOT(ifnetlabel);
+
+	return (mac_lomac_single_in_range(p, i) ? 0 : EACCES);
+}
+
+static int
+mac_lomac_check_kld_load(struct ucred *cred, struct vnode *vp,
+    struct label *label)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(label);
+
+	if (mac_lomac_subject_privileged(subj))
+		return (EPERM);
+
+	if (!mac_lomac_high_single(obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_kld_unload(struct ucred *cred)
+{
+	struct mac_lomac *subj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+
+	if (mac_lomac_subject_privileged(subj))
+		return (EPERM);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe,
+    struct label *pipelabel, unsigned long cmd, void /* caddr_t */ *data)
+{
+
+	if(!mac_lomac_enabled)
+		return (0);
+
+	/* XXX: This will be implemented soon... */
+
+	return (0);
+}
+
+static int
+mac_lomac_check_pipe_read(struct ucred *cred, struct pipe *pipe,
+    struct label *pipelabel)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT((pipelabel));
+
+	if (!mac_lomac_dominate_single(obj, subj))
+		return (maybe_demote(subj, obj, "reading", "pipe", NULL));
+
+	return (0);
+}
+
+static int
+mac_lomac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
+    struct label *pipelabel, struct label *newlabel)
+{
+	struct mac_lomac *subj, *obj, *new;
+	int error;
+
+	new = SLOT(newlabel);
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(pipelabel);
+
+	/*
+	 * If there is a LOMAC label update for a pipe, it must be a
+	 * single update.
+	 */
+	error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE);
+	if (error)
+		return (error);
+
+	/*
+	 * To perform a relabel of a pipe (LOMAC label or not), LOMAC must
+	 * authorize the relabel.
+	 */
+	if (!mac_lomac_single_in_range(obj, subj))
+		return (EPERM);
+
+	/*
+	 * If the LOMAC label is to be changed, authorize as appropriate.
+	 */
+	if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
+		/*
+		 * To change the LOMAC label on a pipe, the new pipe label
+		 * must be in the subject range.
+		 */
+		if (!mac_lomac_single_in_range(new, subj))
+			return (EPERM);
+
+		/*
+		 * To change the LOMAC label on a pipe to be EQUAL, the
+		 * subject must have appropriate privilege.
+		 */
+		if (mac_lomac_contains_equal(new)) {
+			error = mac_lomac_subject_privileged(subj);
+			if (error)
+				return (error);
+		}
+	}
+
+	return (0);
+}
+
+static int
+mac_lomac_check_pipe_write(struct ucred *cred, struct pipe *pipe,
+    struct label *pipelabel)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT((pipelabel));
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_proc_debug(struct ucred *cred, struct proc *proc)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(&proc->p_ucred->cr_label);
+
+	/* XXX: range checks */
+	if (!mac_lomac_dominate_single(obj, subj))
+		return (ESRCH);
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_proc_sched(struct ucred *cred, struct proc *proc)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(&proc->p_ucred->cr_label);
+
+	/* XXX: range checks */
+	if (!mac_lomac_dominate_single(obj, subj))
+		return (ESRCH);
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(&proc->p_ucred->cr_label);
+
+	/* XXX: range checks */
+	if (!mac_lomac_dominate_single(obj, subj))
+		return (ESRCH);
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_socket_deliver(struct socket *so, struct label *socketlabel,
+    struct mbuf *m, struct label *mbuflabel)
+{
+	struct mac_lomac *p, *s;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	p = SLOT(mbuflabel);
+	s = SLOT(socketlabel);
+
+	return (mac_lomac_equal_single(p, s) ? 0 : EACCES);
+}
+
+static int
+mac_lomac_check_socket_relabel(struct ucred *cred, struct socket *socket,
+    struct label *socketlabel, struct label *newlabel)
+{
+	struct mac_lomac *subj, *obj, *new;
+	int error;
+
+	new = SLOT(newlabel);
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(socketlabel);
+
+	/*
+	 * If there is a LOMAC label update for the socket, it may be
+	 * an update of single.
+	 */
+	error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE);
+	if (error)
+		return (error);
+
+	/*
+	 * To relabel a socket, the old socket single must be in the subject
+	 * range.
+	 */
+	if (!mac_lomac_single_in_range(obj, subj))
+		return (EPERM);
+
+	/*
+	 * If the LOMAC label is to be changed, authorize as appropriate.
+	 */
+	if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
+		/*
+		 * To relabel a socket, the new socket single must be in
+		 * the subject range.
+		 */
+		if (!mac_lomac_single_in_range(new, subj))
+			return (EPERM);
+
+		/*
+		 * To change the LOMAC label on the socket to contain EQUAL,
+		 * the subject must have appropriate privilege.
+		 */
+		if (mac_lomac_contains_equal(new)) {
+			error = mac_lomac_subject_privileged(subj);
+			if (error)
+				return (error);
+		}
+	}
+
+	return (0);
+}
+
+static int
+mac_lomac_check_socket_visible(struct ucred *cred, struct socket *socket,
+    struct label *socketlabel)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(socketlabel);
+
+	if (!mac_lomac_dominate_single(obj, subj))
+		return (ENOENT);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_system_swapon(struct ucred *cred, struct vnode *vp,
+    struct label *label)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(label);
+
+	if (mac_lomac_subject_privileged(subj))
+		return (EPERM);
+
+	if (!mac_lomac_high_single(obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_system_sysctl(struct ucred *cred, int *name, u_int namelen,
+    void *old, size_t *oldlenp, int inkernel, void *new, size_t newlen)
+{
+	struct mac_lomac *subj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+
+	/*
+	 * In general, treat sysctl variables as lomac/high, but also
+	 * require privilege to change them, since they are a
+	 * communications channel between grades.  Exempt MIB
+	 * queries from this due to undocmented sysctl magic.
+	 * XXXMAC: This probably requires some more review.
+	 */
+	if (new != NULL) {
+		if (namelen > 0 && name[0] == 0)
+			return (0);
+
+#ifdef notdef
+		if (!mac_lomac_subject_dominate_high(subj))
+			return (EACCES);
+#endif
+
+		if (mac_lomac_subject_privileged(subj))
+			return (EPERM);
+	}
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_create(struct ucred *cred, struct vnode *dvp,
+    struct label *dlabel, struct componentname *cnp, struct vattr *vap)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(dlabel);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+	if (obj->ml_flags & MAC_LOMAC_FLAG_AUX &&
+	    !mac_lomac_dominate_element(&subj->ml_single, &obj->ml_auxsingle))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_delete(struct ucred *cred, struct vnode *dvp,
+    struct label *dlabel, struct vnode *vp, struct label *label,
+    struct componentname *cnp)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(dlabel);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	obj = SLOT(label);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
+    struct label *label, acl_type_t type)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(label);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_link(struct ucred *cred, struct vnode *dvp,
+    struct label *dlabel, struct vnode *vp, struct label *label,
+    struct componentname *cnp)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(dlabel);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	obj = SLOT(label);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_mmap(struct ucred *cred, struct vnode *vp,
+    struct label *label, int prot)
+{
+	struct mac_lomac *subj, *obj;
+
+	/*
+	 * Rely on the use of open()-time protections to handle
+	 * non-revocation cases.
+	 */
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(label);
+
+	if (prot & VM_PROT_WRITE) {
+		if (!mac_lomac_subject_dominate(subj, obj))
+			return (EACCES);
+	}
+	if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
+		if (!mac_lomac_dominate_single(obj, subj))
+			return (maybe_demote(subj, obj, "mapping", "file", vp));
+	}
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp,
+    struct label *label, int prot)
+{
+	struct mac_lomac *subj, *obj;
+
+	/*
+	 * Rely on the use of open()-time protections to handle
+	 * non-revocation cases.
+	 */
+	if (!mac_lomac_enabled || !revocation_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(label);
+
+	if (prot & VM_PROT_WRITE) {
+		if (!mac_lomac_subject_dominate(subj, obj))
+			return (EACCES);
+	}
+	if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
+		if (!mac_lomac_dominate_single(obj, subj))
+			return (EACCES);
+	}
+
+	return (0);
+}
+
+static void
+mac_lomac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp,
+    struct label *label, /* XXX vm_prot_t */ int *prot)
+{
+	struct mac_lomac *subj, *obj;
+
+	/*
+	 * Rely on the use of open()-time protections to handle
+	 * non-revocation cases.
+	 */
+	if (!mac_lomac_enabled || !revocation_enabled)
+		return;
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(label);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		*prot &= ~VM_PROT_WRITE;
+}
+
+static int
+mac_lomac_check_vnode_open(struct ucred *cred, struct vnode *vp,
+    struct label *vnodelabel, int acc_mode)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(vnodelabel);
+
+	/* XXX privilege override for admin? */
+	if (acc_mode & (VWRITE | VAPPEND | VADMIN)) {
+		if (!mac_lomac_subject_dominate(subj, obj))
+			return (EACCES);
+	}
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled || !revocation_enabled)
+		return (0);
+
+	subj = SLOT(&active_cred->cr_label);
+	obj = SLOT(label);
+
+	if (!mac_lomac_dominate_single(obj, subj))
+		return (maybe_demote(subj, obj, "reading", "file", vp));
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
+    struct label *vnodelabel, struct label *newlabel)
+{
+	struct mac_lomac *old, *new, *subj;
+	int error;
+
+	old = SLOT(vnodelabel);
+	new = SLOT(newlabel);
+	subj = SLOT(&cred->cr_label);
+
+	/*
+	 * If there is a LOMAC label update for the vnode, it must be a
+	 * single label, with an optional explicit auxiliary single.
+	 */
+	error = lomac_atmostflags(new,
+	    MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_AUX);
+	if (error)
+		return (error);
+
+	/*
+	 * To perform a relabel of the vnode (LOMAC label or not), LOMAC must
+	 * authorize the relabel.
+	 */
+	if (!mac_lomac_single_in_range(old, subj))
+		return (EPERM);
+
+	/*
+	 * If the LOMAC label is to be changed, authorize as appropriate.
+	 */
+	if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
+		/*
+		 * To change the LOMAC label on a vnode, the new vnode label
+		 * must be in the subject range.
+		 */
+		if (!mac_lomac_single_in_range(new, subj))
+			return (EPERM);
+
+		/*
+		 * To change the LOMAC label on the vnode to be EQUAL,
+		 * the subject must have appropriate privilege.
+		 */
+		if (mac_lomac_contains_equal(new)) {
+			error = mac_lomac_subject_privileged(subj);
+			if (error)
+				return (error);
+		}
+	}
+	if (new->ml_flags & MAC_LOMAC_FLAG_AUX) {
+		/*
+		 * To change the auxiliary LOMAC label on a vnode, the new
+		 * vnode label must be in the subject range.
+		 */
+		if (!mac_lomac_auxsingle_in_range(new, subj))
+			return (EPERM);
+
+		/*
+		 * To change the auxiliary LOMAC label on the vnode to be
+		 * EQUAL, the subject must have appropriate privilege.
+		 */
+		if (mac_lomac_contains_equal(new)) {
+			error = mac_lomac_subject_privileged(subj);
+			if (error)
+				return (error);
+		}
+	}
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
+    struct label *dlabel, struct vnode *vp, struct label *label,
+    struct componentname *cnp)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(dlabel);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	obj = SLOT(label);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
+    struct label *dlabel, struct vnode *vp, struct label *label, int samedir,
+    struct componentname *cnp)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(dlabel);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	if (vp != NULL) {
+		obj = SLOT(label);
+
+		if (!mac_lomac_subject_dominate(subj, obj))
+			return (EACCES);
+	}
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_revoke(struct ucred *cred, struct vnode *vp,
+    struct label *label)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(label);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_setacl(struct ucred *cred, struct vnode *vp,
+    struct label *label, acl_type_t type, struct acl *acl)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(label);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
+    struct label *vnodelabel, int attrnamespace, const char *name,
+    struct uio *uio)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(vnodelabel);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	/* XXX: protect the MAC EA in a special way? */
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_setflags(struct ucred *cred, struct vnode *vp,
+    struct label *vnodelabel, u_long flags)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(vnodelabel);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_setmode(struct ucred *cred, struct vnode *vp,
+    struct label *vnodelabel, mode_t mode)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(vnodelabel);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_setowner(struct ucred *cred, struct vnode *vp,
+    struct label *vnodelabel, uid_t uid, gid_t gid)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(vnodelabel);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
+    struct label *vnodelabel, struct timespec atime, struct timespec mtime)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled)
+		return (0);
+
+	subj = SLOT(&cred->cr_label);
+	obj = SLOT(vnodelabel);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static int
+mac_lomac_check_vnode_write(struct ucred *active_cred,
+    struct ucred *file_cred, struct vnode *vp, struct label *label)
+{
+	struct mac_lomac *subj, *obj;
+
+	if (!mac_lomac_enabled || !revocation_enabled)
+		return (0);
+
+	subj = SLOT(&active_cred->cr_label);
+	obj = SLOT(label);
+
+	if (!mac_lomac_subject_dominate(subj, obj))
+		return (EACCES);
+
+	return (0);
+}
+
+static void
+mac_lomac_thread_userret(struct thread *td)
+{
+	struct proc *p = td->td_proc;
+	struct mac_lomac_proc *subj = PSLOT(&p->p_label);
+	struct ucred *newcred, *oldcred;
+	int dodrop;
+
+	mtx_lock(&subj->mtx);
+	if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) {
+		dodrop = 0;
+		mtx_unlock(&subj->mtx);
+		newcred = crget();
+		/*
+		 * Prevent a lock order reversal in
+		 * mac_cred_mmapped_drop_perms; ideally, the other
+		 * user of subj->mtx wouldn't be holding Giant.
+		 */
+		mtx_lock(&Giant);
+		PROC_LOCK(p);
+		mtx_lock(&subj->mtx);
+		/*
+		 * Check if we lost the race while allocating the cred.
+		 */
+		if ((subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) == 0) {
+			crfree(newcred);
+			goto out;
+		}
+		oldcred = p->p_ucred;
+		crcopy(newcred, oldcred);
+		crhold(newcred);
+		mac_lomac_copy(&subj->mac_lomac, SLOT(&newcred->cr_label));
+		p->p_ucred = newcred;
+		crfree(oldcred);
+		dodrop = 1;
+	out:
+		mtx_unlock(&subj->mtx);
+		PROC_UNLOCK(p);
+		if (dodrop)
+			mac_cred_mmapped_drop_perms(curthread, newcred);
+		mtx_unlock(&Giant);
+	} else {
+		mtx_unlock(&subj->mtx);
+	}
+}
+
+static struct mac_policy_ops mac_lomac_ops =
+{
+	.mpo_destroy = mac_lomac_destroy,
+	.mpo_init = mac_lomac_init,
+	.mpo_init_bpfdesc_label = mac_lomac_init_label,
+	.mpo_init_cred_label = mac_lomac_init_label,
+	.mpo_init_devfsdirent_label = mac_lomac_init_label,
+	.mpo_init_ifnet_label = mac_lomac_init_label,
+	.mpo_init_ipq_label = mac_lomac_init_label,
+	.mpo_init_mbuf_label = mac_lomac_init_label_waitcheck,
+	.mpo_init_mount_label = mac_lomac_init_label,
+	.mpo_init_mount_fs_label = mac_lomac_init_label,
+	.mpo_init_pipe_label = mac_lomac_init_label,
+	.mpo_init_proc_label = mac_lomac_init_proc_label,
+	.mpo_init_socket_label = mac_lomac_init_label_waitcheck,
+	.mpo_init_socket_peer_label = mac_lomac_init_label_waitcheck,
+	.mpo_init_vnode_label = mac_lomac_init_label,
+	.mpo_destroy_bpfdesc_label = mac_lomac_destroy_label,
+	.mpo_destroy_cred_label = mac_lomac_destroy_label,
+	.mpo_destroy_devfsdirent_label = mac_lomac_destroy_label,
+	.mpo_destroy_ifnet_label = mac_lomac_destroy_label,
+	.mpo_destroy_ipq_label = mac_lomac_destroy_label,
+	.mpo_destroy_mbuf_label = mac_lomac_destroy_label,
+	.mpo_destroy_mount_label = mac_lomac_destroy_label,
+	.mpo_destroy_mount_fs_label = mac_lomac_destroy_label,
+	.mpo_destroy_pipe_label = mac_lomac_destroy_label,
+	.mpo_destroy_proc_label = mac_lomac_destroy_proc_label,
+	.mpo_destroy_socket_label = mac_lomac_destroy_label,
+	.mpo_destroy_socket_peer_label = mac_lomac_destroy_label,
+	.mpo_destroy_vnode_label = mac_lomac_destroy_label,
+	.mpo_copy_pipe_label = mac_lomac_copy_label,
+	.mpo_copy_vnode_label = mac_lomac_copy_label,
+	.mpo_externalize_cred_label = mac_lomac_externalize_label,
+	.mpo_externalize_ifnet_label = mac_lomac_externalize_label,
+	.mpo_externalize_pipe_label = mac_lomac_externalize_label,
+	.mpo_externalize_socket_label = mac_lomac_externalize_label,
+	.mpo_externalize_socket_peer_label = mac_lomac_externalize_label,
+	.mpo_externalize_vnode_label = mac_lomac_externalize_label,
+	.mpo_internalize_cred_label = mac_lomac_internalize_label,
+	.mpo_internalize_ifnet_label = mac_lomac_internalize_label,
+	.mpo_internalize_pipe_label = mac_lomac_internalize_label,
+	.mpo_internalize_socket_label = mac_lomac_internalize_label,
+	.mpo_internalize_vnode_label = mac_lomac_internalize_label,
+	.mpo_create_devfs_device = mac_lomac_create_devfs_device,
+	.mpo_create_devfs_directory = mac_lomac_create_devfs_directory,
+	.mpo_create_devfs_symlink = mac_lomac_create_devfs_symlink,
+	.mpo_create_mount = mac_lomac_create_mount,
+	.mpo_create_root_mount = mac_lomac_create_root_mount,
+	.mpo_relabel_vnode = mac_lomac_relabel_vnode,
+	.mpo_update_devfsdirent = mac_lomac_update_devfsdirent,
+	.mpo_associate_vnode_devfs = mac_lomac_associate_vnode_devfs,
+	.mpo_associate_vnode_extattr = mac_lomac_associate_vnode_extattr,
+	.mpo_associate_vnode_singlelabel =
+	    mac_lomac_associate_vnode_singlelabel,
+	.mpo_create_vnode_extattr = mac_lomac_create_vnode_extattr,
+	.mpo_setlabel_vnode_extattr = mac_lomac_setlabel_vnode_extattr,
+	.mpo_create_mbuf_from_socket = mac_lomac_create_mbuf_from_socket,
+	.mpo_create_pipe = mac_lomac_create_pipe,
+	.mpo_create_socket = mac_lomac_create_socket,
+	.mpo_create_socket_from_socket = mac_lomac_create_socket_from_socket,
+	.mpo_relabel_pipe = mac_lomac_relabel_pipe,
+	.mpo_relabel_socket = mac_lomac_relabel_socket,
+	.mpo_set_socket_peer_from_mbuf = mac_lomac_set_socket_peer_from_mbuf,
+	.mpo_set_socket_peer_from_socket =
+	    mac_lomac_set_socket_peer_from_socket,
+	.mpo_create_bpfdesc = mac_lomac_create_bpfdesc,
+	.mpo_create_datagram_from_ipq = mac_lomac_create_datagram_from_ipq,
+	.mpo_create_fragment = mac_lomac_create_fragment,
+	.mpo_create_ifnet = mac_lomac_create_ifnet,
+	.mpo_create_ipq = mac_lomac_create_ipq,
+	.mpo_create_mbuf_from_mbuf = mac_lomac_create_mbuf_from_mbuf,
+	.mpo_create_mbuf_linklayer = mac_lomac_create_mbuf_linklayer,
+	.mpo_create_mbuf_from_bpfdesc = mac_lomac_create_mbuf_from_bpfdesc,
+	.mpo_create_mbuf_from_ifnet = mac_lomac_create_mbuf_from_ifnet,
+	.mpo_create_mbuf_multicast_encap =
+	    mac_lomac_create_mbuf_multicast_encap,
+	.mpo_create_mbuf_netlayer = mac_lomac_create_mbuf_netlayer,
+	.mpo_fragment_match = mac_lomac_fragment_match,
+	.mpo_relabel_ifnet = mac_lomac_relabel_ifnet,
+	.mpo_update_ipq = mac_lomac_update_ipq,
+	.mpo_create_cred = mac_lomac_create_cred,
+	.mpo_execve_transition = mac_lomac_execve_transition,
+	.mpo_execve_will_transition = mac_lomac_execve_will_transition,
+	.mpo_create_proc0 = mac_lomac_create_proc0,
+	.mpo_create_proc1 = mac_lomac_create_proc1,
+	.mpo_relabel_cred = mac_lomac_relabel_cred,
+	.mpo_check_bpfdesc_receive = mac_lomac_check_bpfdesc_receive,
+	.mpo_check_cred_relabel = mac_lomac_check_cred_relabel,
+	.mpo_check_cred_visible = mac_lomac_check_cred_visible,
+	.mpo_check_ifnet_relabel = mac_lomac_check_ifnet_relabel,
+	.mpo_check_ifnet_transmit = mac_lomac_check_ifnet_transmit,
+	.mpo_check_kld_load = mac_lomac_check_kld_load,
+	.mpo_check_kld_unload = mac_lomac_check_kld_unload,
+	.mpo_check_pipe_ioctl = mac_lomac_check_pipe_ioctl,
+	.mpo_check_pipe_read = mac_lomac_check_pipe_read,
+	.mpo_check_pipe_relabel = mac_lomac_check_pipe_relabel,
+	.mpo_check_pipe_write = mac_lomac_check_pipe_write,
+	.mpo_check_proc_debug = mac_lomac_check_proc_debug,
+	.mpo_check_proc_sched = mac_lomac_check_proc_sched,
+	.mpo_check_proc_signal = mac_lomac_check_proc_signal,
+	.mpo_check_socket_deliver = mac_lomac_check_socket_deliver,
+	.mpo_check_socket_relabel = mac_lomac_check_socket_relabel,
+	.mpo_check_socket_visible = mac_lomac_check_socket_visible,
+	.mpo_check_system_swapon = mac_lomac_check_system_swapon,
+	.mpo_check_system_sysctl = mac_lomac_check_system_sysctl,
+	.mpo_check_vnode_access = mac_lomac_check_vnode_open,
+	.mpo_check_vnode_create = mac_lomac_check_vnode_create,
+	.mpo_check_vnode_delete = mac_lomac_check_vnode_delete,
+	.mpo_check_vnode_deleteacl = mac_lomac_check_vnode_deleteacl,
+	.mpo_check_vnode_link = mac_lomac_check_vnode_link,
+	.mpo_check_vnode_mmap = mac_lomac_check_vnode_mmap,
+	.mpo_check_vnode_mmap_downgrade = mac_lomac_check_vnode_mmap_downgrade,
+	.mpo_check_vnode_mprotect = mac_lomac_check_vnode_mprotect,
+	.mpo_check_vnode_open = mac_lomac_check_vnode_open,
+	.mpo_check_vnode_read = mac_lomac_check_vnode_read,
+	.mpo_check_vnode_relabel = mac_lomac_check_vnode_relabel,
+	.mpo_check_vnode_rename_from = mac_lomac_check_vnode_rename_from,
+	.mpo_check_vnode_rename_to = mac_lomac_check_vnode_rename_to,
+	.mpo_check_vnode_revoke = mac_lomac_check_vnode_revoke,
+	.mpo_check_vnode_setacl = mac_lomac_check_vnode_setacl,
+	.mpo_check_vnode_setextattr = mac_lomac_check_vnode_setextattr,
+	.mpo_check_vnode_setflags = mac_lomac_check_vnode_setflags,
+	.mpo_check_vnode_setmode = mac_lomac_check_vnode_setmode,
+	.mpo_check_vnode_setowner = mac_lomac_check_vnode_setowner,
+	.mpo_check_vnode_setutimes = mac_lomac_check_vnode_setutimes,
+	.mpo_check_vnode_write = mac_lomac_check_vnode_write,
+	.mpo_thread_userret = mac_lomac_thread_userret,
+};
+
+MAC_POLICY_SET(&mac_lomac_ops, mac_lomac, "TrustedBSD MAC/LOMAC",
+    MPC_LOADTIME_FLAG_NOTLATE, &mac_lomac_slot);
diff --git a/sys/security/mac_lomac/mac_lomac.h b/sys/security/mac_lomac/mac_lomac.h
new file mode 100644
index 000000000000..605821d61d6e
--- /dev/null
+++ b/sys/security/mac_lomac/mac_lomac.h
@@ -0,0 +1,93 @@
+/*-
+ * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
+ * Copyright (c) 2001, 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed by Robert Watson for the TrustedBSD Project.
+ *
+ * This software was developed for the FreeBSD Project in part by NAI Labs,
+ * the Security Research Division of Network Associates, Inc. under
+ * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
+ * CHATS research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+/*
+ * Definitions for the TrustedBSD LOMAC integrity policy module.
+ */
+#ifndef _SYS_SECURITY_MAC_LOMAC_H
+#define	_SYS_SECURITY_MAC_LOMAC_H
+
+#define	MAC_LOMAC_EXTATTR_NAMESPACE	EXTATTR_NAMESPACE_SYSTEM
+#define	MAC_LOMAC_EXTATTR_NAME		"mac_lomac"
+
+#define	MAC_LOMAC_LABEL_NAME		"lomac"
+
+#define	MAC_LOMAC_FLAG_SINGLE	0x00000001	/* ml_single initialized */
+#define	MAC_LOMAC_FLAG_RANGE	0x00000002	/* ml_range* initialized */
+#define	MAC_LOMAC_FLAG_AUX	0x00000004	/* ml_auxsingle initialized */
+#define	MAC_LOMAC_FLAGS_BOTH	(MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_RANGE)
+#define	MAC_LOMAC_FLAG_UPDATE	0x00000008	/* must demote this process */
+
+#define	MAC_LOMAC_TYPE_UNDEF	0	/* Undefined */
+#define	MAC_LOMAC_TYPE_GRADE	1	/* Hierarchal grade with mb_grade. */
+#define	MAC_LOMAC_TYPE_LOW	2	/* Dominated by any
+					 * MAC_LOMAC_TYPE_LABEL. */
+#define	MAC_LOMAC_TYPE_HIGH	3	/* Dominates any
+					 * MAC_LOMAC_TYPE_LABEL. */
+#define	MAC_LOMAC_TYPE_EQUAL	4	/* Equivilent to any
+					 * MAC_LOMAC_TYPE_LABEL. */
+
+/* XXXMAC: temporarily disabled because we still need struct oldmac. */
+/*
+ * Structures and constants associated with a LOMAC Integrity policy.
+ * mac_lomac represents a LOMAC label, with mb_type determining its properties,
+ * and mb_grade represents the hierarchal grade if valid for the current
+ * mb_type.
+ */
+
+struct mac_lomac_element {
+	u_short	mle_type;
+	u_short	mle_grade;
+};
+
+/*
+ * LOMAC labels start with two components: a single label, and a label
+ * range.  Depending on the context, one or both may be used; the ml_flags
+ * field permits the provider to indicate what fields are intended for
+ * use.  The auxiliary label works the same way, but is only valid on
+ * filesystem objects to provide inheritance semantics on directories
+ * and "non-demoting" execution on executable files.
+ */
+struct mac_lomac {
+	int				ml_flags;
+	struct mac_lomac_element	ml_single;
+	struct mac_lomac_element	ml_rangelow, ml_rangehigh;
+	struct mac_lomac_element	ml_auxsingle;
+};
+
+#endif /* !_SYS_SECURITY_MAC_LOMAC_H */