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/*
* Copyright (C) 2014, 2015 netblue30 (netblue30@yahoo.com)
*
* 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.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <sys/syscall.h>
#include <errno.h>
#include <unistd.h>
#include <sys/prctl.h>
#include <signal.h>
#include <dirent.h>
#include <string.h>
#include "../include/common.h"
int join_namespace(pid_t pid, char *type) {
char *path;
if (asprintf(&path, "/proc/%u/ns/%s", pid, type) == -1)
errExit("asprintf");
int fd = open(path, O_RDONLY);
if (fd < 0) {
free(path);
fprintf(stderr, "Error: cannot open /proc/%u/ns/%s.\n", pid, type);
return -1;
}
if (syscall(__NR_setns, fd, 0) < 0) {
free(path);
fprintf(stderr, "Error: cannot join namespace %s.\n", type);
close(fd);
return -1;
}
close(fd);
free(path);
return 0;
}
// return 1 if error
int name2pid(const char *name, pid_t *pid) {
pid_t parent = getpid();
DIR *dir;
if (!(dir = opendir("/proc"))) {
// sleep 2 seconds and try again
sleep(2);
if (!(dir = opendir("/proc"))) {
fprintf(stderr, "Error: cannot open /proc directory\n");
exit(1);
}
}
struct dirent *entry;
char *end;
while ((entry = readdir(dir))) {
pid_t newpid = strtol(entry->d_name, &end, 10);
if (end == entry->d_name || *end)
continue;
if (newpid == parent)
continue;
// check if this is a firejail executable
char *comm = pid_proc_comm(newpid);
if (comm) {
// remove \n
char *ptr = strchr(comm, '\n');
if (ptr)
*ptr = '\0';
if (strcmp(comm, "firejail")) {
free(comm);
continue;
}
free(comm);
}
char *cmd = pid_proc_cmdline(newpid);
if (cmd) {
// mark the end of the name
char *ptr = strstr(cmd, "--name=");
char *start = ptr;
if (!ptr) {
free(cmd);
continue;
}
while (*ptr != ' ' && *ptr != '\t' && *ptr != '\0')
ptr++;
*ptr = '\0';
int rv = strcmp(start + 7, name);
if (rv == 0) {
free(cmd);
*pid = newpid;
closedir(dir);
return 0;
}
free(cmd);
}
}
closedir(dir);
return 1;
}
#define BUFLEN 4096
char *pid_proc_comm(const pid_t pid) {
// open /proc/pid/cmdline file
char *fname;
int fd;
if (asprintf(&fname, "/proc/%d//comm", pid) == -1)
return NULL;
if ((fd = open(fname, O_RDONLY)) < 0) {
free(fname);
return NULL;
}
free(fname);
// read file
unsigned char buffer[BUFLEN];
ssize_t len;
if ((len = read(fd, buffer, sizeof(buffer) - 1)) <= 0) {
close(fd);
return NULL;
}
buffer[len] = '\0';
close(fd);
// return a malloc copy of the command line
char *rv = strdup((char *) buffer);
if (strlen(rv) == 0) {
free(rv);
return NULL;
}
return rv;
}
char *pid_proc_cmdline(const pid_t pid) {
// open /proc/pid/cmdline file
char *fname;
int fd;
if (asprintf(&fname, "/proc/%d/cmdline", pid) == -1)
return NULL;
if ((fd = open(fname, O_RDONLY)) < 0) {
free(fname);
return NULL;
}
free(fname);
// read file
unsigned char buffer[BUFLEN];
ssize_t len;
if ((len = read(fd, buffer, sizeof(buffer) - 1)) <= 0) {
close(fd);
return NULL;
}
buffer[len] = '\0';
close(fd);
// clean data
int i;
for (i = 0; i < len; i++) {
if (buffer[i] == '\0')
buffer[i] = ' ';
// if (buffer[i] >= 0x80) // execv in progress!!!
// return NULL;
}
// return a malloc copy of the command line
char *rv = strdup((char *) buffer);
if (strlen(rv) == 0) {
free(rv);
return NULL;
}
return rv;
}
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