1 files changed, 73 insertions, 0 deletions

diff --git a/src/firejail/selinux.c b/src/firejail/selinux.c
new file mode 100644
index 000000000..52d6788ef
--- /dev/null
+++ b/src/firejail/selinux.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2020 Firejail and systemd authors
+ *
+ * This file is part of firejail project, from systemd selinux-util.c
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+#if HAVE_SELINUX
+#include "firejail.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include <selinux/context.h>
+#include <selinux/label.h>
+#include <selinux/selinux.h>
+
+static struct selabel_handle *label_hnd = NULL;
+static int selinux_enabled = -1;
+#endif
+
+void selinux_relabel_path(const char *path, const char *inside_path)
+{
+#if HAVE_SELINUX
+        char procfs_path[64];
+        char *fcon = NULL;
+        int fd;
+        struct stat st;
+
+        if (selinux_enabled == -1)
+                selinux_enabled = is_selinux_enabled();
+
+        if (!selinux_enabled && arg_debug)
+                return;
+
+        if (!label_hnd)
+                label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
+
+        /* Open the file as O_PATH, to pin it while we determine and adjust the label */
+        fd = open(path, O_NOFOLLOW|O_CLOEXEC|O_PATH);
+        if (fd < 0)
+                return;
+        if (fstat(fd, &st) < 0)
+                goto close;
+
+        if (selabel_lookup_raw(label_hnd, &fcon, inside_path, st.st_mode)  == 0) {
+                sprintf(procfs_path, "/proc/self/fd/%i", fd);
+                if (arg_debug)
+                        printf("Relabeling %s as %s (%s)\n", path, inside_path, fcon);
+
+                setfilecon_raw(procfs_path, fcon);
+        }
+        freecon(fcon);
+ close:
+        close(fd);
+#else
+        (void) path;
+        (void) inside_path;
+#endif
+}