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|
//! # client
//!
//! Ssh2-config implementation with a ssh2 client
use std::env::args;
use std::fs::File;
use std::io::BufReader;
use std::net::{SocketAddr, TcpStream, ToSocketAddrs};
use std::path::{Path, PathBuf};
use std::process::exit;
use std::time::Duration;
use dirs::home_dir;
use ssh2::{MethodType, Session};
use ssh2_config::{HostParams, ParseRule, SshConfig};
fn main() {
// get args
let args: Vec<String> = args().collect();
let address = match args.get(1) {
Some(addr) => addr.to_string(),
None => {
usage();
exit(255)
}
};
// check path
let config_path = match args.get(2) {
Some(p) => PathBuf::from(p),
None => {
let mut p = home_dir().expect("Failed to get home_dir for guest OS");
p.extend(Path::new(".ssh/config"));
p
}
};
// Open config file
let config = read_config(config_path.as_path());
let params = config.query(address.as_str());
connect(address.as_str(), ¶ms);
}
fn usage() {
eprintln!("Usage: cargo run --example client -- <address:port> [config-path]");
}
fn read_config(p: &Path) -> SshConfig {
let mut reader = match File::open(p) {
Ok(f) => BufReader::new(f),
Err(err) => panic!("Could not open file '{}': {}", p.display(), err),
};
match SshConfig::default().parse(&mut reader, ParseRule::STRICT) {
Ok(config) => config,
Err(err) => panic!("Failed to parse configuration: {}", err),
}
}
fn connect(host: &str, params: &HostParams) {
// Resolve host
let host = match params.host_name.as_deref() {
Some(h) => h,
None => host,
};
let port = params.port.unwrap_or(22);
let host = match host.contains(':') {
true => host.to_string(),
false => format!("{}:{}", host, port),
};
println!("Connecting to host {}...", host);
let socket_addresses: Vec<SocketAddr> = match host.to_socket_addrs() {
Ok(s) => s.collect(),
Err(err) => {
panic!("Could not parse host: {}", err);
}
};
let mut tcp: Option<TcpStream> = None;
// Try addresses
for socket_addr in socket_addresses.iter() {
match TcpStream::connect_timeout(
socket_addr,
params.connect_timeout.unwrap_or(Duration::from_secs(30)),
) {
Ok(stream) => {
println!("Established connection with {}", socket_addr);
tcp = Some(stream);
break;
}
Err(_) => continue,
}
}
// If stream is None, return connection timeout
let stream: TcpStream = match tcp {
Some(t) => t,
None => {
panic!("No suitable socket address found; connection timeout");
}
};
let mut session: Session = match Session::new() {
Ok(s) => s,
Err(err) => {
panic!("Could not create session: {}", err);
}
};
// Configure session
configure_session(&mut session, params);
// Connect
session.set_tcp_stream(stream);
if let Err(err) = session.handshake() {
panic!("Handshake failed: {}", err);
}
// Get username
let username = match params.user.as_ref() {
Some(u) => {
println!("Using username '{}'", u);
u.clone()
}
None => read_secret("Username: "),
};
let password = read_secret("Password: ");
if let Err(err) = session.userauth_password(username.as_str(), password.as_str()) {
panic!("Authentication failed: {}", err);
}
if let Some(banner) = session.banner() {
println!("{}", banner);
}
println!("Connection OK!");
if let Err(err) = session.disconnect(None, "mandi mandi!", None) {
panic!("Disconnection failed: {}", err);
}
}
fn configure_session(session: &mut Session, params: &HostParams) {
println!("Configuring session...");
if let Some(compress) = params.compression {
println!("compression: {}", compress);
session.set_compress(compress);
}
if params.tcp_keep_alive.unwrap_or(false) && params.server_alive_interval.is_some() {
let interval = params.server_alive_interval.unwrap().as_secs() as u32;
println!("keepalive interval: {} seconds", interval);
session.set_keepalive(true, interval);
}
// KEX
if let Err(err) = session.method_pref(
MethodType::Kex,
params.kex_algorithms.algorithms().join(",").as_str(),
) {
panic!("Could not set KEX algorithms: {}", err);
}
// host key
if let Err(err) = session.method_pref(
MethodType::HostKey,
params.host_key_algorithms.algorithms().join(",").as_str(),
) {
panic!("Could not set host key algorithms: {}", err);
}
// ciphers
if let Err(err) = session.method_pref(
MethodType::CryptCs,
params.ciphers.algorithms().join(",").as_str(),
) {
panic!("Could not set crypt algorithms (client-server): {}", err);
}
if let Err(err) = session.method_pref(
MethodType::CryptSc,
params.ciphers.algorithms().join(",").as_str(),
) {
panic!("Could not set crypt algorithms (server-client): {}", err);
}
// mac
if let Err(err) = session.method_pref(
MethodType::MacCs,
params.mac.algorithms().join(",").as_str(),
) {
panic!("Could not set MAC algorithms (client-server): {}", err);
}
if let Err(err) = session.method_pref(
MethodType::MacSc,
params.mac.algorithms().join(",").as_str(),
) {
panic!("Could not set MAC algorithms (server-client): {}", err);
}
}
fn read_secret(prompt: &str) -> String {
rpassword::prompt_password(prompt).expect("Failed to read from stdin")
}
|
