1 files changed, 109 insertions, 0 deletions
diff --git a/src/libudev/libudev-selinux-private.c b/src/libudev/libudev-selinux-private.c
new file mode 100644
index 0000000000..d68097f991
--- /dev/null
+++ b/src/libudev/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);
+        dbg(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);
+}