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/*
* Copyright (C) 2014-2017 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.
*/
#ifdef HAVE_GIT_INSTALL
#include "firejail.h"
#include <sys/utsname.h>
#include <sched.h>
#include <sys/mount.h>
// install a very simple mount namespace sandbox with a tmpfs on top of /tmp
// and drop privileges
static void sbox_ns(void) {
if (unshare(CLONE_NEWNS) < 0)
errExit("unshare");
// mount events are not forwarded between the host the sandbox
if (mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL) < 0) {
errExit("mount");
}
// mount a tmpfs on top of /tmp
if (mount(NULL, "/tmp", "tmpfs", 0, NULL) < 0)
errExit("mount");
// drop privileges
if (setgid(getgid()) < 0)
errExit("setgid/getgid");
if (setuid(getuid()) < 0)
errExit("setuid/getuid");
assert(getenv("LD_PRELOAD") == NULL);
printf("Running as "); fflush(0);
int rv = system("whoami");
(void) rv;
printf("/tmp directory: "); fflush(0);
rv = system("ls -l /tmp");
(void) rv;
}
void git_install(void) {
// redirect to "/usr/bin/firejail --noprofile --private-tmp /usr/lib/firejail/fgit-install.sh"
EUID_ASSERT();
EUID_ROOT();
// install a mount namespace with a tmpfs on top of /tmp
sbox_ns();
// run command
const char *cmd = LIBDIR "/firejail/fgit-install.sh";
int rv = system(cmd);
(void) rv;
exit(0);
}
void git_uninstall(void) {
// redirect to "/usr/bin/firejail --noprofile --private-tmp /usr/lib/firejail/fgit-install.sh"
EUID_ASSERT();
EUID_ROOT();
// install a mount namespace with a tmpfs on top of /tmp
sbox_ns();
// run command
const char *cmd = LIBDIR "/firejail/fgit-uninstall.sh";
int rv = system(cmd);
(void) rv;
exit(0);
}
#endif // HAVE_GIT_INSTALL
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