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Commit | Line | Data |
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3e4311fe DC |
1 | use std::cmp::min; |
2 | use std::collections::HashMap; | |
3 | use std::ffi::{OsStr, OsString}; | |
cfa75e79 | 4 | use std::io::{ErrorKind, Write}; |
3e4311fe DC |
5 | use std::os::unix::io::{AsRawFd, FromRawFd}; |
6 | use std::os::unix::process::CommandExt; | |
7 | use std::process::Command; | |
8 | use std::time::{Duration, Instant}; | |
9 | ||
cfa75e79 | 10 | use anyhow::{bail, format_err, Result}; |
3e4311fe | 11 | use clap::{App, AppSettings, Arg}; |
c2d63828 | 12 | use mio::net::{TcpListener, TcpStream}; |
c2d63828 | 13 | use mio::unix::SourceFd; |
3c586bd8 | 14 | use mio::{Events, Interest, Poll, Token}; |
3e4311fe | 15 | |
cc1dbda3 DC |
16 | use proxmox_io::ByteBuffer; |
17 | use proxmox_sys::{ | |
18 | error::io_err_other, | |
cc1dbda3 DC |
19 | linux::pty::{make_controlling_terminal, PTY}, |
20 | }; | |
3e4311fe DC |
21 | |
22 | const MSG_TYPE_DATA: u8 = 0; | |
23 | const MSG_TYPE_RESIZE: u8 = 1; | |
24 | //const MSG_TYPE_PING: u8 = 2; | |
25 | ||
26 | fn remove_number(buf: &mut ByteBuffer) -> Option<usize> { | |
27 | loop { | |
28 | if let Some(pos) = &buf.iter().position(|&x| x == b':') { | |
29 | let data = buf.remove_data(*pos); | |
30 | buf.consume(1); // the ':' | |
31 | let len = match std::str::from_utf8(&data) { | |
32 | Ok(lenstring) => match lenstring.parse() { | |
33 | Ok(len) => len, | |
34 | Err(err) => { | |
35 | eprintln!("error parsing number: '{}'", err); | |
36 | break; | |
37 | } | |
38 | }, | |
39 | Err(err) => { | |
40 | eprintln!("error parsing number: '{}'", err); | |
41 | break; | |
42 | } | |
43 | }; | |
44 | return Some(len); | |
45 | } else if buf.len() > 20 { | |
46 | buf.consume(20); | |
47 | } else { | |
48 | break; | |
49 | } | |
50 | } | |
51 | None | |
52 | } | |
53 | ||
54 | fn process_queue(buf: &mut ByteBuffer, pty: &mut PTY) -> Option<usize> { | |
55 | if buf.is_empty() { | |
56 | return None; | |
57 | } | |
58 | ||
59 | loop { | |
60 | if buf.len() < 2 { | |
61 | break; | |
62 | } | |
63 | ||
64 | let msgtype = buf[0] - b'0'; | |
65 | ||
66 | if msgtype == MSG_TYPE_DATA { | |
67 | buf.consume(2); | |
68 | if let Some(len) = remove_number(buf) { | |
69 | return Some(len); | |
70 | } | |
71 | } else if msgtype == MSG_TYPE_RESIZE { | |
72 | buf.consume(2); | |
73 | if let Some(cols) = remove_number(buf) { | |
74 | if let Some(rows) = remove_number(buf) { | |
75 | pty.set_size(cols as u16, rows as u16).ok()?; | |
76 | } | |
77 | } | |
78 | // ignore incomplete messages | |
79 | } else { | |
80 | buf.consume(1); | |
81 | // ignore invalid or ping (msgtype 2) | |
82 | } | |
83 | } | |
84 | ||
85 | None | |
86 | } | |
87 | ||
88 | type TicketResult = Result<(Box<[u8]>, Box<[u8]>)>; | |
89 | ||
90 | /// Reads from the stream and returns the first line and the rest | |
91 | fn read_ticket_line( | |
92 | stream: &mut TcpStream, | |
93 | buf: &mut ByteBuffer, | |
94 | timeout: Duration, | |
95 | ) -> TicketResult { | |
7739b7e8 | 96 | let mut poll = Poll::new()?; |
3c586bd8 FG |
97 | poll.registry() |
98 | .register(stream, Token(0), Interest::READABLE)?; | |
7739b7e8 | 99 | let mut events = Events::with_capacity(1); |
41f32a28 FG |
100 | |
101 | let now = Instant::now(); | |
102 | let mut elapsed = Duration::new(0, 0); | |
7739b7e8 DC |
103 | |
104 | loop { | |
41f32a28 | 105 | poll.poll(&mut events, Some(timeout - elapsed))?; |
7739b7e8 DC |
106 | if !events.is_empty() { |
107 | match buf.read_from(stream) { | |
108 | Ok(n) => { | |
109 | if n == 0 { | |
cfa75e79 | 110 | bail!("connection closed before authentication"); |
7739b7e8 | 111 | } |
3e4311fe | 112 | } |
7739b7e8 | 113 | Err(err) if err.kind() == ErrorKind::WouldBlock => {} |
cfa75e79 | 114 | Err(err) => return Err(err.into()), |
7739b7e8 DC |
115 | } |
116 | ||
117 | if buf[..].contains(&b'\n') { | |
118 | break; | |
119 | } | |
120 | ||
121 | if buf.is_full() { | |
cfa75e79 | 122 | bail!("authentication data is incomplete: {:?}", &buf[..]); |
3e4311fe | 123 | } |
7739b7e8 DC |
124 | } |
125 | ||
41f32a28 FG |
126 | elapsed = now.elapsed(); |
127 | if elapsed > timeout { | |
cfa75e79 | 128 | bail!("timed out"); |
3e4311fe DC |
129 | } |
130 | } | |
131 | ||
3e4311fe DC |
132 | let newline_idx = &buf[..].iter().position(|&x| x == b'\n').unwrap(); |
133 | ||
134 | let line = buf.remove_data(*newline_idx); | |
135 | buf.consume(1); // discard newline | |
136 | ||
137 | match line.iter().position(|&b| b == b':') { | |
138 | Some(pos) => { | |
139 | let (username, ticket) = line.split_at(pos); | |
140 | Ok((username.into(), ticket[1..].into())) | |
141 | } | |
cfa75e79 | 142 | None => bail!("authentication data is invalid"), |
3e4311fe DC |
143 | } |
144 | } | |
145 | ||
146 | fn authenticate( | |
147 | username: &[u8], | |
148 | ticket: &[u8], | |
149 | path: &str, | |
150 | perm: Option<&str>, | |
151 | authport: u16, | |
152 | port: Option<u16>, | |
153 | ) -> Result<()> { | |
81a288b9 TL |
154 | let mut post_fields: Vec<(&str, &str)> = Vec::with_capacity(5); |
155 | post_fields.push(("username", std::str::from_utf8(username)?)); | |
156 | post_fields.push(("password", std::str::from_utf8(ticket)?)); | |
157 | post_fields.push(("path", path)); | |
3e4311fe | 158 | if let Some(perm) = perm { |
81a288b9 | 159 | post_fields.push(("privs", perm)); |
3e4311fe | 160 | } |
81a288b9 | 161 | let port_str; |
3e4311fe | 162 | if let Some(port) = port { |
81a288b9 TL |
163 | port_str = port.to_string(); |
164 | post_fields.push(("port", &port_str)); | |
3e4311fe DC |
165 | } |
166 | ||
81a288b9 | 167 | let url = format!("http://localhost:{}/api2/json/access/ticket", authport); |
3e4311fe | 168 | |
81a288b9 TL |
169 | match ureq::post(&url).send_form(&post_fields[..]) { |
170 | Ok(res) if res.status() == 200 => Ok(()), | |
171 | Ok(res) | Err(ureq::Error::Status(_, res)) => { | |
172 | let code = res.status(); | |
173 | bail!("invalid authentication - {} {}", code, res.status_text()) | |
174 | } | |
175 | Err(err) => bail!("authentication request failed - {}", err), | |
3e4311fe | 176 | } |
3e4311fe DC |
177 | } |
178 | ||
179 | fn listen_and_accept( | |
180 | hostname: &str, | |
181 | port: u64, | |
182 | port_as_fd: bool, | |
183 | timeout: Duration, | |
184 | ) -> Result<(TcpStream, u16)> { | |
185 | let listener = if port_as_fd { | |
186 | unsafe { std::net::TcpListener::from_raw_fd(port as i32) } | |
187 | } else { | |
188 | std::net::TcpListener::bind((hostname, port as u16))? | |
189 | }; | |
190 | let port = listener.local_addr()?.port(); | |
c2d63828 DC |
191 | let mut listener = TcpListener::from_std(listener); |
192 | let mut poll = Poll::new()?; | |
3e4311fe | 193 | |
3c586bd8 FG |
194 | poll.registry() |
195 | .register(&mut listener, Token(0), Interest::READABLE)?; | |
3e4311fe DC |
196 | |
197 | let mut events = Events::with_capacity(1); | |
198 | ||
41f32a28 FG |
199 | let now = Instant::now(); |
200 | let mut elapsed = Duration::new(0, 0); | |
201 | ||
3e4311fe | 202 | loop { |
41f32a28 | 203 | poll.poll(&mut events, Some(timeout - elapsed))?; |
3e4311fe | 204 | if !events.is_empty() { |
c2d63828 | 205 | let (stream, client) = listener.accept()?; |
3e4311fe DC |
206 | println!("client connection: {:?}", client); |
207 | return Ok((stream, port)); | |
208 | } | |
41f32a28 FG |
209 | |
210 | elapsed = now.elapsed(); | |
211 | if elapsed > timeout { | |
cfa75e79 | 212 | bail!("timed out"); |
3e4311fe DC |
213 | } |
214 | } | |
215 | } | |
216 | ||
217 | fn run_pty(cmd: &OsStr, params: clap::OsValues) -> Result<PTY> { | |
218 | let (mut pty, secondary_name) = PTY::new().map_err(io_err_other)?; | |
219 | ||
220 | let mut filtered_env: HashMap<OsString, OsString> = std::env::vars_os() | |
221 | .filter(|&(ref k, _)| { | |
222 | k == "PATH" | |
223 | || k == "USER" | |
224 | || k == "HOME" | |
225 | || k == "LANG" | |
226 | || k == "LANGUAGE" | |
227 | || k.to_string_lossy().starts_with("LC_") | |
228 | }) | |
229 | .collect(); | |
230 | filtered_env.insert("TERM".into(), "xterm-256color".into()); | |
231 | ||
232 | let mut command = Command::new(cmd); | |
233 | ||
234 | command.args(params).env_clear().envs(&filtered_env); | |
235 | ||
236 | unsafe { | |
237 | command.pre_exec(move || { | |
238 | make_controlling_terminal(&secondary_name).map_err(io_err_other)?; | |
239 | Ok(()) | |
240 | }); | |
241 | } | |
242 | ||
243 | command.spawn()?; | |
244 | ||
245 | pty.set_size(80, 20).map_err(|x| x.as_errno().unwrap())?; | |
246 | Ok(pty) | |
247 | } | |
248 | ||
249 | const TCP: Token = Token(0); | |
250 | const PTY: Token = Token(1); | |
251 | ||
252 | fn do_main() -> Result<()> { | |
253 | let matches = App::new("termproxy") | |
254 | .setting(AppSettings::TrailingVarArg) | |
255 | .arg(Arg::with_name("port").takes_value(true).required(true)) | |
256 | .arg( | |
257 | Arg::with_name("authport") | |
258 | .takes_value(true) | |
259 | .long("authport"), | |
260 | ) | |
261 | .arg(Arg::with_name("use-port-as-fd").long("port-as-fd")) | |
262 | .arg( | |
263 | Arg::with_name("path") | |
264 | .takes_value(true) | |
265 | .long("path") | |
266 | .required(true), | |
267 | ) | |
268 | .arg(Arg::with_name("perm").takes_value(true).long("perm")) | |
269 | .arg(Arg::with_name("cmd").multiple(true).required(true)) | |
270 | .get_matches(); | |
271 | ||
272 | let port: u64 = matches | |
273 | .value_of("port") | |
274 | .unwrap() | |
275 | .parse() | |
276 | .map_err(io_err_other)?; | |
277 | let path = matches.value_of("path").unwrap(); | |
278 | let perm: Option<&str> = matches.value_of("perm"); | |
279 | let mut cmdparams = matches.values_of_os("cmd").unwrap(); | |
280 | let cmd = cmdparams.next().unwrap(); | |
281 | let authport: u16 = matches | |
282 | .value_of("authport") | |
283 | .unwrap_or("85") | |
284 | .parse() | |
285 | .map_err(io_err_other)?; | |
286 | let mut pty_buf = ByteBuffer::new(); | |
287 | let mut tcp_buf = ByteBuffer::new(); | |
288 | ||
289 | let use_port_as_fd = matches.is_present("use-port-as-fd"); | |
290 | ||
291 | if use_port_as_fd && port > u16::MAX as u64 { | |
cfa75e79 | 292 | return Err(format_err!("port too big")); |
3e4311fe | 293 | } else if port > i32::MAX as u64 { |
cfa75e79 | 294 | return Err(format_err!("Invalid FD number")); |
3e4311fe DC |
295 | } |
296 | ||
c2d63828 | 297 | let (mut tcp_handle, port) = |
3e4311fe | 298 | listen_and_accept("localhost", port, use_port_as_fd, Duration::new(10, 0)) |
cfa75e79 | 299 | .map_err(|err| format_err!("failed waiting for client: {}", err))?; |
3e4311fe | 300 | |
c2d63828 | 301 | let (username, ticket) = read_ticket_line(&mut tcp_handle, &mut pty_buf, Duration::new(10, 0)) |
cfa75e79 | 302 | .map_err(|err| format_err!("failed reading ticket: {}", err))?; |
3e4311fe DC |
303 | let port = if use_port_as_fd { Some(port) } else { None }; |
304 | authenticate(&username, &ticket, path, perm, authport, port)?; | |
c2d63828 | 305 | tcp_handle.write_all(b"OK").expect("error writing response"); |
3e4311fe | 306 | |
c2d63828 | 307 | let mut poll = Poll::new()?; |
3e4311fe DC |
308 | let mut events = Events::with_capacity(128); |
309 | ||
310 | let mut pty = run_pty(cmd, cmdparams)?; | |
311 | ||
c2d63828 DC |
312 | poll.registry().register( |
313 | &mut tcp_handle, | |
3e4311fe | 314 | TCP, |
bb32b0c6 | 315 | Interest::READABLE | Interest::WRITABLE, |
3e4311fe | 316 | )?; |
c2d63828 DC |
317 | poll.registry().register( |
318 | &mut SourceFd(&pty.as_raw_fd()), | |
3e4311fe | 319 | PTY, |
bb32b0c6 | 320 | Interest::READABLE | Interest::WRITABLE, |
3e4311fe DC |
321 | )?; |
322 | ||
323 | let mut tcp_writable = true; | |
324 | let mut pty_writable = true; | |
325 | let mut tcp_readable = true; | |
326 | let mut pty_readable = true; | |
327 | let mut remaining = 0; | |
328 | let mut finished = false; | |
329 | ||
330 | while !finished { | |
331 | if tcp_readable && !pty_buf.is_full() || pty_readable && !tcp_buf.is_full() { | |
332 | poll.poll(&mut events, Some(Duration::new(0, 0)))?; | |
333 | } else { | |
334 | poll.poll(&mut events, None)?; | |
335 | } | |
336 | ||
337 | for event in &events { | |
c2d63828 DC |
338 | let writable = event.is_writable(); |
339 | let readable = event.is_readable(); | |
340 | if event.is_read_closed() { | |
3e4311fe DC |
341 | finished = true; |
342 | } | |
343 | match event.token() { | |
344 | TCP => { | |
345 | if readable { | |
346 | tcp_readable = true; | |
347 | } | |
348 | if writable { | |
349 | tcp_writable = true; | |
350 | } | |
351 | } | |
352 | PTY => { | |
353 | if readable { | |
354 | pty_readable = true; | |
355 | } | |
356 | if writable { | |
357 | pty_writable = true; | |
358 | } | |
359 | } | |
360 | _ => unreachable!(), | |
361 | } | |
362 | } | |
363 | ||
364 | while tcp_readable && !pty_buf.is_full() { | |
365 | let bytes = match pty_buf.read_from(&mut tcp_handle) { | |
366 | Ok(bytes) => bytes, | |
367 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
368 | tcp_readable = false; | |
369 | break; | |
370 | } | |
371 | Err(err) => { | |
372 | if !finished { | |
cfa75e79 | 373 | return Err(format_err!("error reading from tcp: {}", err)); |
3e4311fe DC |
374 | } |
375 | break; | |
376 | } | |
377 | }; | |
378 | if bytes == 0 { | |
379 | finished = true; | |
380 | break; | |
381 | } | |
382 | } | |
383 | ||
384 | while pty_readable && !tcp_buf.is_full() { | |
385 | let bytes = match tcp_buf.read_from(&mut pty) { | |
386 | Ok(bytes) => bytes, | |
387 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
388 | pty_readable = false; | |
389 | break; | |
390 | } | |
391 | Err(err) => { | |
392 | if !finished { | |
cfa75e79 | 393 | return Err(format_err!("error reading from pty: {}", err)); |
3e4311fe DC |
394 | } |
395 | break; | |
396 | } | |
397 | }; | |
398 | if bytes == 0 { | |
399 | finished = true; | |
400 | break; | |
401 | } | |
402 | } | |
403 | ||
404 | while !tcp_buf.is_empty() && tcp_writable { | |
405 | let bytes = match tcp_handle.write(&tcp_buf[..]) { | |
406 | Ok(bytes) => bytes, | |
407 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
408 | tcp_writable = false; | |
409 | break; | |
410 | } | |
411 | Err(err) => { | |
412 | if !finished { | |
cfa75e79 | 413 | return Err(format_err!("error writing to tcp : {}", err)); |
3e4311fe DC |
414 | } |
415 | break; | |
416 | } | |
417 | }; | |
418 | tcp_buf.consume(bytes); | |
419 | } | |
420 | ||
421 | while !pty_buf.is_empty() && pty_writable { | |
422 | if remaining == 0 { | |
423 | remaining = match process_queue(&mut pty_buf, &mut pty) { | |
424 | Some(val) => val, | |
425 | None => break, | |
426 | }; | |
427 | } | |
428 | let len = min(remaining, pty_buf.len()); | |
429 | let bytes = match pty.write(&pty_buf[..len]) { | |
430 | Ok(bytes) => bytes, | |
431 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
432 | pty_writable = false; | |
433 | break; | |
434 | } | |
435 | Err(err) => { | |
436 | if !finished { | |
cfa75e79 | 437 | return Err(format_err!("error writing to pty : {}", err)); |
3e4311fe DC |
438 | } |
439 | break; | |
440 | } | |
441 | }; | |
442 | remaining -= bytes; | |
443 | pty_buf.consume(bytes); | |
444 | } | |
445 | } | |
446 | ||
447 | Ok(()) | |
448 | } | |
449 | ||
450 | fn main() { | |
451 | std::process::exit(match do_main() { | |
452 | Ok(_) => 0, | |
453 | Err(err) => { | |
454 | eprintln!("{}", err); | |
455 | 1 | |
456 | } | |
457 | }); | |
458 | } |