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vpncloud/src/main.rs

342 lines
12 KiB

// VpnCloud - Peer-to-Peer VPN
// Copyright (C) 2015-2021 Dennis Schwerdel
// This software is licensed under GPL-3 or newer (see LICENSE.md)
#[macro_use]
extern crate log;
#[macro_use]
extern crate serde;
#[cfg(test)]
extern crate tempfile;
#[macro_use]
pub mod util;
#[cfg(test)]
#[macro_use]
mod tests;
pub mod beacon;
pub mod cloud;
pub mod config;
pub mod crypto;
pub mod device;
pub mod error;
#[cfg(feature = "installer")]
pub mod installer;
pub mod messages;
pub mod net;
pub mod oldconfig;
pub mod payload;
pub mod poll;
pub mod port_forwarding;
pub mod table;
pub mod traffic;
pub mod types;
#[cfg(feature = "wizard")]
pub mod wizard;
#[cfg(feature = "websocket")]
pub mod wsproxy;
use structopt::StructOpt;
use std::{
fs::{self, File, Permissions},
io::{self, Write},
net::{Ipv4Addr, UdpSocket},
os::unix::fs::PermissionsExt,
path::Path,
process,
str::FromStr,
sync::Mutex,
thread,
};
use crate::{
cloud::GenericCloud,
config::{Args, Command, Config, DEFAULT_PORT},
crypto::Crypto,
device::{Device, TunTapDevice, Type},
net::Socket,
oldconfig::OldConfigFile,
payload::Protocol,
util::SystemTimeSource,
};
#[cfg(feature = "websocket")]
use crate::wsproxy::ProxyConnection;
struct DualLogger {
file: Option<Mutex<File>>,
}
impl DualLogger {
pub fn new<P: AsRef<Path>>(path: Option<P>) -> Result<Self, io::Error> {
if let Some(path) = path {
let path = path.as_ref();
if path.exists() {
fs::remove_file(path)?
}
let file = File::create(path)?;
Ok(DualLogger { file: Some(Mutex::new(file)) })
} else {
Ok(DualLogger { file: None })
}
}
}
impl log::Log for DualLogger {
#[inline]
fn enabled(&self, _metadata: &log::Metadata) -> bool {
true
}
#[inline]
fn log(&self, record: &log::Record) {
if self.enabled(record.metadata()) {
println!("{} - {}", record.level(), record.args());
if let Some(ref file) = self.file {
let mut file = file.lock().expect("Lock poisoned");
let time = chrono::Local::now().format("%F %H:%M:%S");
writeln!(file, "{} - {} - {}", time, record.level(), record.args())
.expect("Failed to write to logfile");
}
}
}
#[inline]
fn flush(&self) {
if let Some(ref file) = self.file {
let mut file = file.lock().expect("Lock poisoned");
try_fail!(file.flush(), "Logging error: {}");
}
}
}
fn run_script(script: &str, ifname: &str) {
let mut cmd = process::Command::new("sh");
cmd.arg("-c").arg(&script).env("IFNAME", ifname);
debug!("Running script: {:?}", cmd);
match cmd.status() {
Ok(status) => {
if !status.success() {
error!("Script returned with error: {:?}", status.code())
}
}
Err(e) => error!("Failed to execute script {:?}: {}", script, e),
}
}
fn parse_ip_netmask(addr: &str) -> Result<(Ipv4Addr, Ipv4Addr), String> {
let (ip_str, len_str) = match addr.find('/') {
Some(pos) => (&addr[..pos], &addr[pos + 1..]),
None => (addr, "24"),
};
let prefix_len = u8::from_str(len_str).map_err(|_| format!("Invalid prefix length: {}", len_str))?;
if prefix_len > 32 {
return Err(format!("Invalid prefix length: {}", prefix_len));
}
let ip = Ipv4Addr::from_str(ip_str).map_err(|_| format!("Invalid ip address: {}", ip_str))?;
let netmask = Ipv4Addr::from(u32::max_value().checked_shl(32 - prefix_len as u32).unwrap());
Ok((ip, netmask))
}
fn setup_device(config: &Config) -> TunTapDevice {
let device = try_fail!(
TunTapDevice::new(&config.device_name, config.device_type, config.device_path.as_ref().map(|s| s as &str)),
"Failed to open virtual {} interface {}: {}",
config.device_type,
config.device_name
);
info!("Opened device {}", device.ifname());
config.call_hook("device_setup", vec![("IFNAME", device.ifname())], true);
if let Err(err) = device.set_mtu(None) {
error!("Error setting optimal MTU on {}: {}", device.ifname(), err);
}
if let Some(ip) = &config.ip {
let (ip, netmask) = try_fail!(parse_ip_netmask(ip), "Invalid ip address given: {}");
info!("Configuring device with ip {}, netmask {}", ip, netmask);
try_fail!(device.configure(ip, netmask), "Failed to configure device: {}");
}
if let Some(script) = &config.ifup {
run_script(script, device.ifname());
}
if config.fix_rp_filter {
try_fail!(device.fix_rp_filter(), "Failed to change rp_filter settings: {}");
}
if let Ok(val) = device.get_rp_filter() {
if val != 1 {
warn!("Your networking configuration might be affected by a vulnerability (https://vpncloud.ddswd.de/docs/security/cve-2019-14899/), please change your rp_filter setting to 1 (currently {}).", val);
}
}
config.call_hook("device_configured", vec![("IFNAME", device.ifname())], true);
device
}
#[allow(clippy::cognitive_complexity)]
fn run<P: Protocol, S: Socket>(config: Config, socket: S) {
let device = setup_device(&config);
let port_forwarding = if config.port_forwarding { socket.create_port_forwarding() } else { None };
let stats_file = match config.stats_file {
None => None,
Some(ref name) => {
let path = Path::new(name);
if path.exists() {
try_fail!(fs::remove_file(path), "Failed to remove file {}: {}", name);
}
let file = try_fail!(File::create(name), "Failed to create stats file: {}");
try_fail!(
fs::set_permissions(name, Permissions::from_mode(0o644)),
"Failed to set permissions on stats file: {}"
);
Some(file)
}
};
let mut cloud =
GenericCloud::<TunTapDevice, P, S, SystemTimeSource>::new(&config, socket, device, port_forwarding, stats_file);
for mut addr in config.peers {
if addr.find(':').unwrap_or(0) <= addr.find(']').unwrap_or(0) {
// : not present or only in IPv6 address
addr = format!("{}:{}", addr, DEFAULT_PORT)
}
try_fail!(cloud.connect(&addr as &str), "Failed to send message to {}: {}", &addr);
cloud.add_reconnect_peer(addr);
}
if config.daemonize {
info!("Running process as daemon");
let mut daemonize = daemonize::Daemonize::new();
if let Some(user) = config.user {
daemonize = daemonize.user(&user as &str);
}
if let Some(group) = config.group {
daemonize = daemonize.group(&group as &str);
}
if let Some(pid_file) = config.pid_file {
daemonize = daemonize.pid_file(pid_file).chown_pid_file(true);
// Give child process some time to write PID file
daemonize = daemonize.exit_action(|| thread::sleep(std::time::Duration::from_millis(10)));
}
try_fail!(daemonize.start(), "Failed to daemonize: {}");
} else if config.user.is_some() || config.group.is_some() {
info!("Dropping privileges");
let mut pd = privdrop::PrivDrop::default();
if let Some(user) = config.user {
pd = pd.user(user);
}
if let Some(group) = config.group {
pd = pd.group(group);
}
try_fail!(pd.apply(), "Failed to drop privileges: {}");
}
cloud.run();
if let Some(script) = config.ifdown {
run_script(&script, cloud.ifname());
}
}
fn main() {
let args: Args = Args::from_args();
if args.version {
println!("VpnCloud v{}", env!("CARGO_PKG_VERSION"));
return;
}
let logger = try_fail!(DualLogger::new(args.log_file.as_ref()), "Failed to open logfile: {}");
log::set_boxed_logger(Box::new(logger)).unwrap();
assert!(!args.verbose || !args.quiet);
log::set_max_level(if args.verbose {
log::LevelFilter::Debug
} else if args.quiet {
log::LevelFilter::Error
} else {
log::LevelFilter::Info
});
if let Some(cmd) = args.cmd {
match cmd {
Command::GenKey { password } => {
let (privkey, pubkey) = Crypto::generate_keypair(password.as_deref());
println!("Private key: {}\nPublic key: {}\n", privkey, pubkey);
println!(
"Attention: Keep the private key secret and use only the public key on other nodes to establish trust."
);
}
Command::MigrateConfig { config_file } => {
info!("Trying to convert from old config format");
let f = try_fail!(File::open(&config_file), "Failed to open config file: {:?}");
let config_file_old: OldConfigFile =
try_fail!(serde_yaml::from_reader(f), "Config file not valid for version 1: {:?}");
let new_config = config_file_old.convert();
info!("Successfully converted from old format");
info!("Renaming original file to {}.orig", config_file);
try_fail!(
fs::rename(&config_file, format!("{}.orig", config_file)),
"Failed to rename original file: {:?}"
);
info!("Writing new config back into {}", config_file);
let f = try_fail!(File::create(&config_file), "Failed to open config file: {:?}");
try_fail!(
fs::set_permissions(&config_file, fs::Permissions::from_mode(0o600)),
"Failed to set permissions on file: {:?}"
);
try_fail!(serde_yaml::to_writer(f, &new_config), "Failed to write converted config: {:?}");
}
Command::Completion { shell } => {
Args::clap().gen_completions_to(env!("CARGO_PKG_NAME"), shell, &mut io::stdout());
}
#[cfg(feature = "websocket")]
Command::WsProxy { listen } => {
try_fail!(wsproxy::run_proxy(&listen), "Failed to run websocket proxy: {:?}");
}
#[cfg(feature = "wizard")]
Command::Config { name } => {
try_fail!(wizard::configure(name), "Wizard failed: {}");
}
#[cfg(feature = "installer")]
Command::Install { uninstall } => {
if uninstall {
try_fail!(installer::uninstall(), "Uninstall failed: {}");
} else {
try_fail!(installer::install(), "Install failed: {}");
}
}
}
return;
}
let mut config = Config::default();
if let Some(ref file) = args.config {
info!("Reading config file '{}'", file);
let f = try_fail!(File::open(file), "Failed to open config file: {:?}");
let config_file = match serde_yaml::from_reader(f) {
Ok(config) => config,
Err(err) => {
error!("Failed to read config file: {}", err);
info!("Trying to convert from old config format");
let f = try_fail!(File::open(file), "Failed to open config file: {:?}");
let config_file_old: OldConfigFile =
try_fail!(serde_yaml::from_reader(f), "Config file is neither version 2 nor version 1: {:?}");
let new_config = config_file_old.convert();
info!("Successfully converted from old format, please migrate your config using migrate-config");
new_config
}
};
config.merge_file(config_file)
}
config.merge_args(args);
debug!("Config: {:?}", config);
if config.crypto.password.is_none() && config.crypto.private_key.is_none() {
error!("Either password or private key must be set in config or given as parameter");
return;
}
#[cfg(feature = "websocket")]
if config.listen.starts_with("ws://") {
let socket = try_fail!(ProxyConnection::listen(&config.listen), "Failed to open socket {}: {}", config.listen);
match config.device_type {
Type::Tap => run::<payload::Frame, _>(config, socket),
Type::Tun => run::<payload::Packet, _>(config, socket),
}
return;
}
let socket = try_fail!(UdpSocket::listen(&config.listen), "Failed to open socket {}: {}", config.listen);
match config.device_type {
Type::Tap => run::<payload::Frame, _>(config, socket),
Type::Tun => run::<payload::Packet, _>(config, socket),
}
}