1 files changed, 110 insertions, 0 deletions

diff --git a/src/firejail/preproc.c b/src/firejail/preproc.c
new file mode 100644
index 000000000..6784ff5ac
--- /dev/null
+++ b/src/firejail/preproc.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2014-2016 Firejail Authors
+ *
+ * This file is part of firejail project
+ *
+ * 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.
+*/
+#include "firejail.h"
+#include <sys/mount.h>
+#include <sys/stat.h>
+
+static int tmpfs_mounted = 0;
+
+// build /run/firejail directory
+void preproc_build_firejail_dir(void) {
+        struct stat s;
+
+        // CentOS 6 doesn't have /run directory
+        if (stat(RUN_FIREJAIL_BASEDIR, &s)) {
+                create_empty_dir_as_root(RUN_FIREJAIL_BASEDIR, 0755);
+        }
+
+        if (stat(RUN_FIREJAIL_DIR, &s)) {
+                create_empty_dir_as_root(RUN_FIREJAIL_DIR, 0755);
+        }
+        
+        if (stat(RUN_FIREJAIL_NETWORK_DIR, &s)) {
+                create_empty_dir_as_root(RUN_FIREJAIL_NETWORK_DIR, 0755);
+        }
+        
+        if (stat(RUN_FIREJAIL_BANDWIDTH_DIR, &s)) {
+                create_empty_dir_as_root(RUN_FIREJAIL_BANDWIDTH_DIR, 0755);
+        }
+                
+        if (stat(RUN_FIREJAIL_NAME_DIR, &s)) {
+                create_empty_dir_as_root(RUN_FIREJAIL_NAME_DIR, 0755);
+        }
+        
+        if (stat(RUN_FIREJAIL_X11_DIR, &s)) {
+                create_empty_dir_as_root(RUN_FIREJAIL_X11_DIR, 0755);
+        }
+        
+        if (stat(RUN_FIREJAIL_APPIMAGE_DIR, &s)) {
+                create_empty_dir_as_root(RUN_FIREJAIL_APPIMAGE_DIR, 0755);
+        }
+        
+        create_empty_file_as_root(RUN_RO_FILE, S_IRUSR);
+        create_empty_dir_as_root(RUN_RO_DIR, S_IRUSR);
+}
+
+// build /run/firejail/mnt directory
+void preproc_mount_mnt_dir(void) {
+        struct stat s;
+        
+        // mount tmpfs on top of /run/firejail/mnt
+        if (!tmpfs_mounted) {
+                if (arg_debug)
+                        printf("Mounting tmpfs on %s directory\n", RUN_MNT_DIR);
+                if (mount("tmpfs", RUN_MNT_DIR, "tmpfs", MS_NOSUID | MS_STRICTATIME | MS_REC,  "mode=755,gid=0") < 0)
+                        errExit("mounting /run/firejail/mnt");
+                tmpfs_mounted = 1;
+                fs_logger2("tmpfs", RUN_MNT_DIR);
+        }
+}
+
+// grab a copy of cp command
+void preproc_build_cp_command(void) {
+        struct stat s;
+        preproc_mount_mnt_dir();
+        if (stat(RUN_CP_COMMAND, &s)) {
+                char* fname = realpath("/bin/cp", NULL);
+                if (fname == NULL) {
+                        fprintf(stderr, "Error: /bin/cp not found\n");
+                        exit(1);
+                }
+                if (stat(fname, &s)) {
+                        fprintf(stderr, "Error: /bin/cp not found\n");
+                        exit(1);
+                }
+                if (is_link(fname)) {
+                        fprintf(stderr, "Error: invalid /bin/cp file\n");
+                        exit(1);
+                }
+                int rv = copy_file(fname, RUN_CP_COMMAND, 0, 0, 0755);
+                if (rv) {
+                        fprintf(stderr, "Error: cannot access /bin/cp\n");
+                        exit(1);
+                }
+                ASSERT_PERMS(RUN_CP_COMMAND, 0, 0, 0755);
+                        
+                free(fname);
+        }
+}
+
+// delete the temporary cp command
+void preproc_delete_cp_command(void) {
+        unlink(RUN_CP_COMMAND);
+}