Introduce support for Mandatory Access Control and extensible

kernel access control.

Provide ugidfw, a utility to manage the ruleset provided by
mac_bsdextended.  Similar to ipfw, only for uids/gids and files.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs

usr.sbin/Makefile

@@ -108,6 +108,7 @@ SUBDIR=	IPXrouted \
 	traceroute6 \
 	trpt \
 	tzsetup \
+	ugidfw \
 	usbd \
 	usbdevs \
 	vidcontrol \

usr.sbin/ugidfw/Makefile

@@ -0,0 +1,7 @@
+# $FreeBSD$
+
+PROG=	ugidfw
+NOMAN=	yes
+LDADD=	-lugidfw
+
+.include <bsd.prog.mk>

usr.sbin/ugidfw/ugidfw.c

@@ -0,0 +1,183 @@
+/*-
+ * Copyright (c) 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project 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.
+ *
+ * $FreeBSD$
+ */
+#include <sys/param.h>
+#include <sys/errno.h>
+#include <sys/time.h>
+#include <sys/sysctl.h>
+#include <sys/vnode.h>
+
+#include <security/mac_bsdextended/mac_bsdextended.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ugidfw.h>
+
+void
+usage(void)
+{
+
+	fprintf(stderr, "ugidfw list\n");
+	fprintf(stderr, "ugidfw set rulenum [subject [not] [uid uid] [gid gid]]"
+	    " [object [not] \\\n");
+	fprintf(stderr, "    [uid uid] [gid gid]] mode arswxn\n");
+	fprintf(stderr, "ugidfw remove rulenum\n");
+
+	exit(-1);
+}
+
+void
+list_rules(void)
+{
+	char errstr[BUFSIZ], charstr[BUFSIZ];
+	struct mac_bsdextended_rule rule;
+	int error, i, rule_count, rule_slots;
+
+	rule_slots = bsde_get_rule_slots(BUFSIZ, errstr);
+	if (rule_slots == -1) {
+		fprintf(stderr, "Unable to get rule slots; mac_bsdextended.ko "
+		    "may not be loaded.\n");
+		fprintf(stderr, "bsde_get_rule_slots: %s\n", errstr);
+		exit (-1);
+	}
+
+	rule_count = bsde_get_rule_count(BUFSIZ, errstr);
+	if (rule_count == -1) {
+		fprintf(stderr, "bsde_get_rule_count: %s\n", errstr);
+		exit (-1);
+	}
+
+	printf("%d slots, %d rules\n", rule_slots, rule_count);
+
+	for (i = 0; i <= rule_slots; i++) {
+		error = bsde_get_rule(i, &rule, BUFSIZ, errstr);
+		switch (error) {
+		case -2:
+			continue;
+		case -1:
+			fprintf(stderr, "rule %d: %s\n", i, errstr);
+			continue;
+		case 0:
+			break;
+		}
+
+		if (bsde_rule_to_string(&rule, charstr, BUFSIZ) == -1)
+			fprintf(stderr,
+			    "Unable to translate rule %d to string\n", i);
+		else
+			printf("%d %s\n", i, charstr);
+	}
+}
+
+void
+set_rule(int argc, char *argv[])
+{
+	char errstr[BUFSIZ];
+	struct mac_bsdextended_rule rule;
+	long value;
+	int error, rulenum;
+	char *endp;
+
+	if (argc < 1)
+		usage();
+
+	value = strtol(argv[0], &endp, 10);
+	if (*endp != '\0')
+		usage();
+
+	if ((long) value != (int) value || value < 0)
+		usage();
+
+	rulenum = value;
+
+	error = bsde_parse_rule(argc - 1, argv + 1, &rule, BUFSIZ, errstr);
+	if (error) {
+		fprintf(stderr, "%s\n", errstr);
+		return;
+	}
+
+	error = bsde_set_rule(rulenum, &rule, BUFSIZ, errstr);
+	if (error) {
+		fprintf(stderr, "%s\n", errstr);
+		return;
+	}
+}
+
+void
+remove_rule(int argc, char *argv[])
+{
+	char errstr[BUFSIZ];
+	long value;
+	int error, rulenum;
+	char *endp;
+
+	if (argc != 1)
+		usage();
+
+	value = strtol(argv[0], &endp, 10);
+	if (*endp != '\0')  
+		usage();
+
+	if ((long) value != (int) value || value < 0)
+		usage();
+
+	rulenum = value;
+
+	error = bsde_delete_rule(rulenum, BUFSIZ, errstr);
+	if (error)
+		fprintf(stderr, "%s\n", errstr);
+}
+
+int
+main(int argc, char *argv[])
+{
+
+	if (argc < 2)
+		usage();
+
+	if (strcmp("list", argv[1]) == 0) {
+		if (argc != 2)
+			usage();
+		list_rules();
+	} else if (strcmp("set", argv[1]) == 0) {
+		set_rule(argc-2, argv+2);
+	} else if (strcmp("remove", argv[1]) == 0) {
+		remove_rule(argc-2, argv+2);
+	} else
+		usage();
+
+	return (0);
+}