[PATCH 7/8] busybox -- libselinux utilities applets

[KaiGai Kohei <kaigai@kaigai.gr.jp>]

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[7/8] busybox-libselinux-07-matchpathcon.patch
  matchpathcon - get the default security context for
  the specified path from the file contexts configuration.
  Security context is a identifier for SELinux.
  Any files has a own security context, and SELinux use it
  to evaluate the attribute of the file.
  When we are setting up a system, we have to attach a security
  context for each files. so, we can obtain the most appropriate
  security context by using matchpathcon.

Signed-off-by: KaiGai Kohei <kaigai@kaigai.gr.jp>

--
KaiGai Kohei <kaigai@kaigai.gr.jp>


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Index: selinux/matchpathcon.c
===================================================================
--- selinux/matchpathcon.c	(revision 0)
+++ selinux/matchpathcon.c	(revision 0)
@@ -0,0 +1,108 @@
+/* matchpathcon  -  get the default security context for the specified
+ *                  path from the file contexts configuration.
+ *                  based on libselinux-1.32
+ * Port to busybox: KaiGai Kohei <kaigai@kaigai.gr.jp>
+ *
+ */
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <errno.h>
+#include <string.h>
+#include <selinux/selinux.h>
+#include "busybox.h"
+
+static int printmatchpathcon(char *path, int header)
+{
+	char *buf;
+	int rc = matchpathcon(path, 0, &buf);
+	if (rc < 0) {
+		fprintf(stderr, "matchpathcon(%s) failed: %s\n", path,
+			strerror(errno));
+		return 1;
+	}
+	if (header)
+		printf("%s\t%s\n", path, buf);
+	else
+		printf("%s\n", buf);
+
+	freecon(buf);
+	return 0;
+}
+
+#define MATCHPATHCON_OPT_NOT_PRINT	(1<<0)	/* -n */
+#define MATCHPATHCON_OPT_NOT_TRANS	(1<<1)	/* -N */
+#define MATCHPATHCON_OPT_FCONTEXT	(1<<2)	/* -f */
+#define MATCHPATHCON_OPT_PREFIX		(1<<3)	/* -p */
+#define MATCHPATHCON_OPT_VERIFY		(1<<4)	/* -V */
+
+int matchpathcon_main(int argc, char **argv)
+{
+	int i;
+	int header = 1;
+	int verify = 0;
+	int notrans = 0;
+	int error = 0;
+	unsigned long opts;
+	char *fcontext, *prefix;
+
+	if (argc < 2)
+		bb_show_usage();
+
+	opts = getopt32(argc, argv, "nNf:p:V", &fcontext, &prefix);
+	if (opts & BB_GETOPT_ERROR)
+		bb_show_usage();
+	if (opts & MATCHPATHCON_OPT_NOT_PRINT)
+		header = 0;
+	if (opts & MATCHPATHCON_OPT_NOT_TRANS) {
+		notrans = 1;
+		set_matchpathcon_flags(MATCHPATHCON_NOTRANS);
+	}
+	if ((opts & MATCHPATHCON_OPT_FCONTEXT) && (opts & MATCHPATHCON_OPT_PREFIX))
+		bb_error_msg_and_die("-f and -p are exclusive");
+
+	if (opts & MATCHPATHCON_OPT_FCONTEXT) {
+		if (matchpathcon_init(fcontext))
+			bb_error_msg_and_die("Error while processing %s: %s",
+					     fcontext, errno ? strerror(errno) : "invalid");
+	}
+	if (opts & MATCHPATHCON_OPT_PREFIX) {
+		if (matchpathcon_init_prefix(NULL, prefix))
+			bb_error_msg_and_die("Error while processing %s:  %s",
+					     prefix, errno ? strerror(errno) : "invalid");
+	}
+	if (opts & MATCHPATHCON_OPT_VERIFY)
+		verify = 1;
+
+	for (i = optind; i < argc; i++) {
+		if (verify) {
+			if (selinux_file_context_verify(argv[i], 0)) {
+				printf("%s verified.\n", argv[i]);
+			} else {
+				security_context_t con;
+				int rc;
+				if (notrans)
+					rc = lgetfilecon_raw(argv[i], &con);
+				else
+					rc = lgetfilecon(argv[i], &con);
+
+				if (rc >= 0) {
+					printf("%s has context %s, should be ",
+					       argv[i], con);
+					error += printmatchpathcon(argv[i], 0);
+					freecon(con);
+				} else {
+					printf
+					    ("actual context unknown: %s, should be ",
+					     strerror(errno));
+					error += printmatchpathcon(argv[i], 0);
+				}
+			}
+		} else {
+			error += printmatchpathcon(argv[i], header);
+		}
+	}
+	matchpathcon_fini();
+	return error;
+}