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/*
* Copyright (C) 2014-2022 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 "../include/pid.h"
#include <fcntl.h>
#define BUFLEN 4096
static void delete_sandbox_run_file(pid_t pid) {
char *fname;
if (asprintf(&fname, "%s/%d", RUN_FIREJAIL_SANDBOX_DIR, pid) == -1)
errExit("asprintf");
int rv = unlink(fname);
(void) rv;
free(fname);
}
static void delete_x11_run_file(pid_t pid) {
char *fname;
if (asprintf(&fname, "%s/%d", RUN_FIREJAIL_X11_DIR, pid) == -1)
errExit("asprintf");
int rv = unlink(fname);
(void) rv;
free(fname);
}
static void delete_profile_run_file(pid_t pid) {
char *fname;
if (asprintf(&fname, "%s/%d", RUN_FIREJAIL_PROFILE_DIR, pid) == -1)
errExit("asprintf");
int rv = unlink(fname);
(void) rv;
free(fname);
}
static void delete_name_run_file(pid_t pid) {
char *fname;
if (asprintf(&fname, "%s/%d", RUN_FIREJAIL_NAME_DIR, pid) == -1)
errExit("asprintf");
int rv = unlink(fname);
(void) rv;
free(fname);
}
void delete_bandwidth_run_file(pid_t pid) {
char *fname;
if (asprintf(&fname, "%s/%d-bandwidth", RUN_FIREJAIL_BANDWIDTH_DIR, (int) pid) == -1)
errExit("asprintf");
unlink(fname);
free(fname);
}
static void delete_network_run_file(pid_t pid) {
char *fname;
if (asprintf(&fname, "%s/%d-netmap", RUN_FIREJAIL_NETWORK_DIR, (int) pid) == -1)
errExit("asprintf");
unlink(fname);
free(fname);
}
void delete_run_files(pid_t pid) {
delete_sandbox_run_file(pid);
delete_bandwidth_run_file(pid);
delete_network_run_file(pid);
delete_name_run_file(pid);
delete_x11_run_file(pid);
delete_profile_run_file(pid);
}
static char *newname(char *name) {
char *rv = name;
pid_t pid;
if (checkcfg(CFG_NAME_CHANGE)) {
// try the name
if (name2pid(name, &pid))
return name;
// return name-pid
if (asprintf(&rv, "%s-%d", name, getpid()) == -1)
errExit("asprintf");
}
return rv;
}
void set_name_run_file(pid_t pid) {
cfg.name = newname(cfg.name);
char *fname;
if (asprintf(&fname, "%s/%d", RUN_FIREJAIL_NAME_DIR, pid) == -1)
errExit("asprintf");
// the file is deleted first
FILE *fp = fopen(fname, "we");
if (!fp) {
fprintf(stderr, "Error: cannot create %s\n", fname);
exit(1);
}
fprintf(fp, "%s\n", cfg.name);
// mode and ownership
SET_PERMS_STREAM(fp, 0, 0, 0644);
fclose(fp);
}
void set_x11_run_file(pid_t pid, int display) {
char *fname;
if (asprintf(&fname, "%s/%d", RUN_FIREJAIL_X11_DIR, pid) == -1)
errExit("asprintf");
// the file is deleted first
FILE *fp = fopen(fname, "we");
if (!fp) {
fprintf(stderr, "Error: cannot create %s\n", fname);
exit(1);
}
fprintf(fp, "%d\n", display);
// mode and ownership
SET_PERMS_STREAM(fp, 0, 0, 0644);
fclose(fp);
}
void set_profile_run_file(pid_t pid, const char *fname) {
char *runfile;
if (asprintf(&runfile, "%s/%d", RUN_FIREJAIL_PROFILE_DIR, pid) == -1)
errExit("asprintf");
EUID_ROOT();
// the file is deleted first
FILE *fp = fopen(runfile, "we");
if (!fp) {
fprintf(stderr, "Error: cannot create %s\n", runfile);
exit(1);
}
fprintf(fp, "%s\n", fname);
// mode and ownership
SET_PERMS_STREAM(fp, 0, 0, 0644);
fclose(fp);
EUID_USER();
free(runfile);
}
int set_sandbox_run_file(pid_t pid, pid_t child) {
char *runfile;
if (asprintf(&runfile, "%s/%d", RUN_FIREJAIL_SANDBOX_DIR, pid) == -1)
errExit("asprintf");
EUID_ROOT();
// the file is deleted first
// this file should be opened with O_CLOEXEC set
int fd = open(runfile, O_CREAT | O_WRONLY | O_TRUNC | O_CLOEXEC, S_IRUSR | S_IWUSR);
if (fd < 0) {
fprintf(stderr, "Error: cannot create %s\n", runfile);
exit(1);
}
free(runfile);
EUID_USER();
char buf[64];
snprintf(buf, sizeof(buf), "%d\n", child);
size_t len = strlen(buf);
size_t done = 0;
while (done != len) {
ssize_t rv = write(fd, buf + done, len - done);
if (rv < 0)
errExit("write");
done += rv;
}
// set exclusive lock on the file
// the lock is never inherited, and is released if this process dies ungracefully
struct flock sandboxlock = {
.l_type = F_WRLCK,
.l_whence = SEEK_SET,
.l_start = 0,
.l_len = 0,
};
if (fcntl(fd, F_SETLK, &sandboxlock) < 0)
errExit("fcntl");
return fd;
}
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