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/*
* Copyright (C) 2014-2021 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 "faudit.h"
#include <sys/socket.h>
#include <arpa/inet.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
static void check_ssh(void) {
// open socket
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock == -1) {
printf("GOOD: SSH server not available on localhost.\n");
return;
}
// connect to localhost
struct sockaddr_in server;
server.sin_addr.s_addr = inet_addr("127.0.0.1");
server.sin_family = AF_INET;
server.sin_port = htons(22);
if (connect(sock , (struct sockaddr *)&server , sizeof(server)) < 0)
printf("GOOD: SSH server not available on localhost.\n");
else {
printf("MAYBE: an SSH server is accessible on localhost. ");
printf("It could be a good idea to create a new network namespace using \"--net=none\" or \"--net=eth0\".\n");
}
close(sock);
}
static void check_http(void) {
// open socket
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock == -1) {
printf("GOOD: HTTP server not available on localhost.\n");
return;
}
// connect to localhost
struct sockaddr_in server;
server.sin_addr.s_addr = inet_addr("127.0.0.1");
server.sin_family = AF_INET;
server.sin_port = htons(80);
if (connect(sock , (struct sockaddr *)&server , sizeof(server)) < 0)
printf("GOOD: HTTP server not available on localhost.\n");
else {
printf("MAYBE: an HTTP server is accessible on localhost. ");
printf("It could be a good idea to create a new network namespace using \"--net=none\" or \"--net=eth0\".\n");
}
close(sock);
}
void check_netlink(void) {
int sock = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, 0);
if (sock == -1) {
printf("GOOD: I cannot connect to netlink socket. Network utilities such as iproute2 will not work in the sandbox.\n");
return;
}
struct sockaddr_nl local;
memset(&local, 0, sizeof(local));
local.nl_family = AF_NETLINK;
local.nl_groups = 0; //subscriptions;
if (bind(sock, (struct sockaddr*)&local, sizeof(local)) < 0) {
printf("GOOD: I cannot connect to netlink socket. Network utilities such as iproute2 will not work in the sandbox.\n");
close(sock);
return;
}
close(sock);
printf("MAYBE: I can connect to netlink socket. Network utilities such as iproute2 will work fine in the sandbox. ");
printf("You can use \"--protocol\" to disable the socket.\n");
}
void network_test(void) {
check_ssh();
check_http();
check_netlink();
}
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