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-rw-r--r--src/libudev-selinux-private.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/src/libudev-selinux-private.c b/src/libudev-selinux-private.c
new file mode 100644
index 0000000000..cb06a280f7
--- /dev/null
+++ b/src/libudev-selinux-private.c
@@ -0,0 +1,109 @@
+/*
+ * libudev - interface to udev device information
+ *
+ * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <selinux/selinux.h>
+
+#include "libudev.h"
+#include "libudev-private.h"
+
+static int selinux_enabled;
+security_context_t selinux_prev_scontext;
+
+void udev_selinux_init(struct udev *udev)
+{
+ /* record the present security context */
+ selinux_enabled = (is_selinux_enabled() > 0);
+ info(udev, "selinux=%i\n", selinux_enabled);
+ if (!selinux_enabled)
+ return;
+ matchpathcon_init_prefix(NULL, udev_get_dev_path(udev));
+ if (getfscreatecon(&selinux_prev_scontext) < 0) {
+ err(udev, "getfscreatecon failed\n");
+ selinux_prev_scontext = NULL;
+ }
+}
+
+void udev_selinux_exit(struct udev *udev)
+{
+ if (!selinux_enabled)
+ return;
+ freecon(selinux_prev_scontext);
+ selinux_prev_scontext = NULL;
+}
+
+void udev_selinux_lsetfilecon(struct udev *udev, const char *file, unsigned int mode)
+{
+ security_context_t scontext = NULL;
+
+ if (!selinux_enabled)
+ return;
+ if (matchpathcon(file, mode, &scontext) < 0) {
+ err(udev, "matchpathcon(%s) failed\n", file);
+ return;
+ }
+ if (lsetfilecon(file, scontext) < 0)
+ err(udev, "setfilecon %s failed: %m\n", file);
+ freecon(scontext);
+}
+
+void udev_selinux_setfscreatecon(struct udev *udev, const char *file, unsigned int mode)
+{
+ security_context_t scontext = NULL;
+
+ if (!selinux_enabled)
+ return;
+
+ if (matchpathcon(file, mode, &scontext) < 0) {
+ err(udev, "matchpathcon(%s) failed\n", file);
+ return;
+ }
+ if (setfscreatecon(scontext) < 0)
+ err(udev, "setfscreatecon %s failed: %m\n", file);
+ freecon(scontext);
+}
+
+void udev_selinux_resetfscreatecon(struct udev *udev)
+{
+ if (!selinux_enabled)
+ return;
+ if (setfscreatecon(selinux_prev_scontext) < 0)
+ err(udev, "setfscreatecon failed: %m\n");
+}
+
+void udev_selinux_setfscreateconat(struct udev *udev, int dfd, const char *file, unsigned int mode)
+{
+ char filename[UTIL_PATH_SIZE];
+
+ if (!selinux_enabled)
+ return;
+
+ /* resolve relative filename */
+ if (file[0] != '/') {
+ char procfd[UTIL_PATH_SIZE];
+ char target[UTIL_PATH_SIZE];
+ ssize_t len;
+
+ snprintf(procfd, sizeof(procfd), "/proc/%u/fd/%u", getpid(), dfd);
+ len = readlink(procfd, target, sizeof(target));
+ if (len <= 0 || len == sizeof(target))
+ return;
+ target[len] = '\0';
+
+ util_strscpyl(filename, sizeof(filename), target, "/", file, NULL);
+ file = filename;
+ }
+ udev_selinux_setfscreatecon(udev, file, mode);
+}