Add 'setcon', 'getcon' commands to set and get the SELinux context.

3 files changed, 93 insertions, 0 deletions

diff --git a/daemon/Makefile.am b/daemon/Makefile.am
index 43cc7527..94069440 100644
--- a/daemon/Makefile.am
+++ b/daemon/Makefile.am
@@ -61,6 +61,7 @@ guestfsd_SOURCES = \
 	readdir.c \
 	realpath.c \
 	scrub.c \
+	selinux.c \
 	sfdisk.c \
 	sleep.c \
 	stat.c \
diff --git a/daemon/configure.ac b/daemon/configure.ac
index 43e331bf..62c28eec 100644
--- a/daemon/configure.ac
+++ b/daemon/configure.ac
@@ -64,6 +64,17 @@ if test "x$have_augeas" = "xyes"; then
         AC_DEFINE([HAVE_AUGEAS],[1],[Define to 1 if you have Augeas])
 fi
 
+dnl Check for libselinux (optional).
+AC_CHECK_HEADERS([selinux/selinux.h])
+AC_CHECK_LIB([selinux],[setexeccon],[
+        LIBS="-lselinux $LIBS"
+	have_libselinux="$ac_cv_header_selinux_selinux_h"
+        AC_CHECK_FUNCS([setcon getcon])
+        ],[have_libselinux=no])
+if test "x$have_libselinux" = "xyes"; then
+        AC_DEFINE([HAVE_LIBSELINUX],[1],[Define to 1 if you have libselinux])
+fi
+
 dnl Check for XDR library.
 AC_CHECK_LIB([portablexdr],[xdrmem_create],[],[
         AC_SEARCH_LIBS([xdrmem_create],[rpc xdr nsl])
diff --git a/daemon/selinux.c b/daemon/selinux.c
new file mode 100644
index 00000000..6e2b347e
--- /dev/null
+++ b/daemon/selinux.c
@@ -0,0 +1,81 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef HAVE_SELINUX_SELINUX_H
+#include <selinux/selinux.h>
+#endif
+
+#include "../src/guestfs_protocol.h"
+#include "daemon.h"
+#include "actions.h"
+
+#ifdef HAVE_LIBSELINUX
+
+/* setcon is only valid under the following circumstances:
+ * - single threaded
+ * - enforcing=0
+ */
+int
+do_setcon (char *context)
+{
+#ifdef HAVE_SETCON
+  if (setcon ((char *) context) == -1) {
+    reply_with_perror ("setcon");
+    return -1;
+  }
+
+  return 0;
+#else
+  reply_with_error ("%s is not available", __func__);
+  return -1;
+#endif
+}
+
+char *
+do_getcon (void)
+{
+#ifdef HAVE_GETCON
+  security_context_t context;
+  char *r;
+
+  if (getcon (&context) == -1) {
+    reply_with_perror ("getcon");
+    return NULL;
+  }
+
+  r = strdup (context);
+  freecon (context);
+  if (r == NULL) {
+    reply_with_perror ("strdup");
+    return NULL;
+  }
+
+  return r;                     /* caller frees */
+#else
+  reply_with_error ("%s is not available", __func__);
+  return -1;
+#endif
+}
+
+#endif /* HAVE_LIBSELINUX */