sestatus: new SELinux applet (KaiGai Kohei <kaigai@ak.jp.nec.com>)

include/applets.h

@@ -300,6 +300,7 @@ USE_RX(APPLET(rx, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_SED(APPLET(sed, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_SELINUXENABLED(APPLET(selinuxenabled, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_SEQ(APPLET_NOFORK(seq, seq, _BB_DIR_USR_BIN, _BB_SUID_NEVER, seq))
+USE_SESTATUS(APPLET(sestatus, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_SETARCH(APPLET(setarch, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_SETCONSOLE(APPLET(setconsole, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_SETENFORCE(APPLET(setenforce, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))

include/usage.h

@@ -3121,6 +3121,12 @@ USE_FEATURE_RUN_PARTS_FANCY("\n	-l	Prints names of all matching files even when
        "	FIRST LAST\n" \
        "	FIRST INCREMENT LAST"
 
+#define sestatus_trivial_usage \
+       "[-vb]"
+#define sestatus_full_usage \
+       "-v	Verbose\n" \
+       "-b	Display current state of booleans"
+
 #define setconsole_trivial_usage \
        "[-r" USE_FEATURE_SETCONSOLE_LONG_OPTIONS("|--reset") "] [DEVICE]"
 #define setconsole_full_usage \

selinux/Config.in

@@ -112,5 +112,12 @@ config SETSEBOOL
 	  Enable support for change boolean.
 	  semanage and -P option is not supported yet.
 
+config SESTATUS
+	bool "sestatus"
+	default n
+	depends on SELINUX
+	help
+	  Displays the status of SELinux.
+
 endmenu
 

selinux/Kbuild

@@ -17,3 +17,4 @@ lib-$(CONFIG_SETENFORCE)	+= setenforce.o
 lib-$(CONFIG_SETFILES)		+= setfiles.o
 lib-$(CONFIG_RESTORECON)	+= setfiles.o
 lib-$(CONFIG_SETSEBOOL)		+= setsebool.o
+lib-$(CONFIG_SESTATUS)		+= sestatus.o

selinux/sestatus.c

@@ -0,0 +1,219 @@
+/*
+ * sestatus -- displays the status of SELinux
+ *
+ * Ported to busybox: KaiGai Kohei <kaigai@ak.jp.nec.com>
+ *
+ * Copyright (C) KaiGai Kohei <kaigai@ak.jp.nec.com>
+ */
+
+#include "libbb.h"
+
+extern char *selinux_mnt;
+
+#define OPT_VERBOSE	(1 << 0)
+#define OPT_BOOLEAN	(1 << 1)
+
+#define COL_FMT		"%-31s "
+
+static void display_boolean(void)
+{
+	char **bools;
+	int i, active, pending, nbool;
+
+	if (security_get_boolean_names(&bools, &nbool) < 0)
+		return;
+
+	puts("\nPolicy booleans:");
+
+	for (i = 0; i < nbool; i++) {
+		active = security_get_boolean_active(bools[i]);
+		if (active < 0)
+			goto skip;
+		pending = security_get_boolean_pending(bools[i]);
+		if (pending < 0)
+			goto skip;
+		printf(COL_FMT "%s",
+		       bools[i], active == 0 ? "off" : "on");
+		if (active != pending)
+			printf(" (%sactivate pending)", pending == 0 ? "in" : "");
+		bb_putchar('\n');
+ skip:
+		if (ENABLE_FEATURE_CLEAN_UP)
+			free(bools[i]);
+	}
+	if (ENABLE_FEATURE_CLEAN_UP)
+		free(bools);
+}
+
+static void read_config(char **pc, int npc, char **fc, int nfc)
+{
+	char buf[256];
+	FILE *fp;
+	int pc_ofs = 0, fc_ofs = 0, section = -1;
+
+	pc[0] = fc[0] = NULL;
+
+	fp = fopen("/etc/sestatus.conf", "rb");
+	if (fp == NULL)
+		return;
+
+	while (fgets(buf, sizeof(buf), fp) != NULL) {
+		int i, c;
+
+		/* kills comments */
+		for (i = 0; (c = buf[i]) != '\0'; i++) {
+			if (c == '#') {
+				buf[i] = '\0';
+				break;
+			}
+		}
+		trim(buf);
+
+		if (buf[0] == '\0')
+			continue;
+
+		if (strcmp(buf, "[process]") == 0) {
+			section = 1;
+		} else if (strcmp(buf, "[files]") == 0) {
+			section = 2;
+		} else {
+			if (section == 1 && pc_ofs < npc -1) {
+				pc[pc_ofs++] = strdup(buf);
+				pc[pc_ofs] = NULL;
+			} else if (section == 2 && fc_ofs < nfc - 1) {
+				fc[fc_ofs++] = strdup(buf);
+				fc[fc_ofs] = NULL;
+			}
+		}
+	}
+	fclose(fp);
+}
+
+static void display_verbose(void)
+{
+	security_context_t con, _con;
+	char *fc[50], *pc[50], *cterm;
+	pid_t *pidList;
+	int i;
+
+	read_config(pc, ARRAY_SIZE(pc), fc, ARRAY_SIZE(fc));
+
+	/* process contexts */
+	puts("\nProcess contexts:");
+
+	/* current context */
+	if (getcon(&con) == 0) {
+		printf(COL_FMT "%s\n", "Current context:", con);
+		if (ENABLE_FEATURE_CLEAN_UP)
+			freecon(con);
+	}
+	/* /sbin/init context */
+	if (getpidcon(1, &con) == 0) {
+		printf(COL_FMT "%s\n", "Init context:", con);
+		if (ENABLE_FEATURE_CLEAN_UP)
+			freecon(con);
+	}
+
+	/* [process] context */
+	for (i = 0; pc[i] != NULL; i++) {
+		pidList = find_pid_by_name(bb_basename(pc[i]));
+		if (pidList[0] > 0 && getpidcon(pidList[0], &con) == 0) {
+			printf(COL_FMT "%s\n", pc[i], con);
+			if (ENABLE_FEATURE_CLEAN_UP)
+				freecon(con);
+		}
+		if (ENABLE_FEATURE_CLEAN_UP)
+			free(pidList);
+	}
+
+	/* files contexts */
+	puts("\nFile contexts:");
+
+	cterm = ttyname(0);
+	puts(cterm);
+	if (cterm && lgetfilecon(cterm, &con) >= 0) {
+		printf(COL_FMT "%s\n", "Controlling term:", con);
+		if (ENABLE_FEATURE_CLEAN_UP)
+			freecon(con);
+	}
+
+	for (i=0; fc[i] != NULL; i++) {
+		struct stat stbuf;
+
+		if (lgetfilecon(fc[i], &con) < 0)
+			continue;
+		if (lstat(fc[i], &stbuf) == 0) {
+			if (S_ISLNK(stbuf.st_mode)) {
+				if (getfilecon(fc[i], &_con) >= 0) {
+					printf(COL_FMT "%s -> %s\n", fc[i], _con, con);
+					if (ENABLE_FEATURE_CLEAN_UP)
+						freecon(_con);
+				}
+			} else {
+				printf(COL_FMT "%s\n", fc[i], con);
+			}
+		}
+		if (ENABLE_FEATURE_CLEAN_UP)
+			freecon(con);
+	}
+}
+
+int sestatus_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int sestatus_main(int argc, char **argv)
+{
+	unsigned opts;
+	const char *pol_path;
+	int rc;
+
+	opt_complementary = "?0";	/* no arguments are required. */
+	opts = getopt32(argv, "vb");
+
+	/* SELinux status: line */
+	rc = is_selinux_enabled();
+	if (rc < 0)
+		goto error;
+	printf(COL_FMT "%s\n", "SELinux status:",
+	       rc == 1 ? "enabled" : "disabled");
+
+	/* SELinuxfs mount: line */
+	if (!selinux_mnt)
+		goto error;
+	printf(COL_FMT "%s\n", "SELinuxfs mount:",
+	       selinux_mnt);
+
+	/* Current mode: line */
+	rc = security_getenforce();
+	if (rc < 0)
+		goto error;
+	printf(COL_FMT "%s\n", "Current mode:",
+	       rc == 0 ? "permissive" : "enforcing");
+
+	/* Mode from config file: line */
+	if (selinux_getenforcemode(&rc) != 0)
+		goto error;
+	printf(COL_FMT "%s\n", "Mode from config file:",
+	       rc < 0 ? "disabled" : (rc == 0 ? "permissive" : "enforcing"));
+
+	/* Policy version: line */
+	rc = security_policyvers();
+	if (rc < 0)
+		goto error;
+	printf(COL_FMT "%u\n", "Policy version:", rc);
+
+	/* Policy from config file: line */
+	pol_path = selinux_policy_root();
+	if (!pol_path)
+		goto error;
+	printf(COL_FMT "%s\n", "Policy from config file:",
+	       bb_basename(pol_path));
+
+	if (opts & OPT_BOOLEAN)
+		display_boolean();
+	if (opts & OPT_VERBOSE)
+		display_verbose();
+
+	return 0;
+
+  error:
+	bb_perror_msg_and_die("libselinux returns unknown state");
+}