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/*
* 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);
}
if (stat(RUN_MNT_DIR, &s)) {
create_empty_dir_as_root(RUN_MNT_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) {
// 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);
// create all seccomp files
// as root, create RUN_SECCOMP_I386 file
create_empty_file_as_root(RUN_SECCOMP_I386, 0644);
if (set_perms(RUN_SECCOMP_I386, getuid(), getgid(), 0644))
errExit("set_perms");
// as root, create RUN_SECCOMP_AMD64 file
create_empty_file_as_root(RUN_SECCOMP_AMD64, 0644);
if (set_perms(RUN_SECCOMP_AMD64, getuid(), getgid(), 0644))
errExit("set_perms");
// as root, create RUN_SECCOMP file
create_empty_file_as_root(RUN_SECCOMP_CFG, 0644);
if (set_perms(RUN_SECCOMP_CFG, getuid(), getgid(), 0644))
errExit("set_perms");
// as root, create RUN_SECCOMP_PROTOCOL file
create_empty_file_as_root(RUN_SECCOMP_PROTOCOL, 0644);
if (set_perms(RUN_SECCOMP_PROTOCOL, getuid(), getgid(), 0644))
errExit("set_perms");
}
}
// 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);
}
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