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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}; | |
9c147346 | 4 | use std::io::{ErrorKind, Result, 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 | ||
10 | use clap::{App, AppSettings, Arg}; | |
11 | use curl::easy::Easy; | |
c2d63828 DC |
12 | use mio::net::{TcpListener, TcpStream}; |
13 | use mio::{Events, Poll, Token, Interest}; | |
14 | use mio::unix::SourceFd; | |
3e4311fe DC |
15 | |
16 | use proxmox::sys::error::io_err_other; | |
17 | use proxmox::sys::linux::pty::{make_controlling_terminal, PTY}; | |
18 | use proxmox::tools::byte_buffer::ByteBuffer; | |
19 | use proxmox::{io_bail, io_format_err}; | |
20 | ||
21 | const MSG_TYPE_DATA: u8 = 0; | |
22 | const MSG_TYPE_RESIZE: u8 = 1; | |
23 | //const MSG_TYPE_PING: u8 = 2; | |
24 | ||
25 | fn remove_number(buf: &mut ByteBuffer) -> Option<usize> { | |
26 | loop { | |
27 | if let Some(pos) = &buf.iter().position(|&x| x == b':') { | |
28 | let data = buf.remove_data(*pos); | |
29 | buf.consume(1); // the ':' | |
30 | let len = match std::str::from_utf8(&data) { | |
31 | Ok(lenstring) => match lenstring.parse() { | |
32 | Ok(len) => len, | |
33 | Err(err) => { | |
34 | eprintln!("error parsing number: '{}'", err); | |
35 | break; | |
36 | } | |
37 | }, | |
38 | Err(err) => { | |
39 | eprintln!("error parsing number: '{}'", err); | |
40 | break; | |
41 | } | |
42 | }; | |
43 | return Some(len); | |
44 | } else if buf.len() > 20 { | |
45 | buf.consume(20); | |
46 | } else { | |
47 | break; | |
48 | } | |
49 | } | |
50 | None | |
51 | } | |
52 | ||
53 | fn process_queue(buf: &mut ByteBuffer, pty: &mut PTY) -> Option<usize> { | |
54 | if buf.is_empty() { | |
55 | return None; | |
56 | } | |
57 | ||
58 | loop { | |
59 | if buf.len() < 2 { | |
60 | break; | |
61 | } | |
62 | ||
63 | let msgtype = buf[0] - b'0'; | |
64 | ||
65 | if msgtype == MSG_TYPE_DATA { | |
66 | buf.consume(2); | |
67 | if let Some(len) = remove_number(buf) { | |
68 | return Some(len); | |
69 | } | |
70 | } else if msgtype == MSG_TYPE_RESIZE { | |
71 | buf.consume(2); | |
72 | if let Some(cols) = remove_number(buf) { | |
73 | if let Some(rows) = remove_number(buf) { | |
74 | pty.set_size(cols as u16, rows as u16).ok()?; | |
75 | } | |
76 | } | |
77 | // ignore incomplete messages | |
78 | } else { | |
79 | buf.consume(1); | |
80 | // ignore invalid or ping (msgtype 2) | |
81 | } | |
82 | } | |
83 | ||
84 | None | |
85 | } | |
86 | ||
87 | type TicketResult = Result<(Box<[u8]>, Box<[u8]>)>; | |
88 | ||
89 | /// Reads from the stream and returns the first line and the rest | |
90 | fn read_ticket_line( | |
91 | stream: &mut TcpStream, | |
92 | buf: &mut ByteBuffer, | |
93 | timeout: Duration, | |
94 | ) -> TicketResult { | |
95 | let now = Instant::now(); | |
96 | while !&buf[..].contains(&b'\n') { | |
97 | if buf.is_full() || now.elapsed() >= timeout { | |
98 | io_bail!("authentication data is incomplete: {:?}", &buf[..]); | |
99 | } | |
3e4311fe DC |
100 | match buf.read_from(stream) { |
101 | Ok(n) => { | |
102 | if n == 0 { | |
103 | io_bail!("connection closed before authentication"); | |
104 | } | |
105 | } | |
106 | Err(err) if err.kind() == ErrorKind::WouldBlock => {} | |
107 | Err(err) => return Err(err), | |
108 | } | |
109 | } | |
110 | ||
3e4311fe DC |
111 | let newline_idx = &buf[..].iter().position(|&x| x == b'\n').unwrap(); |
112 | ||
113 | let line = buf.remove_data(*newline_idx); | |
114 | buf.consume(1); // discard newline | |
115 | ||
116 | match line.iter().position(|&b| b == b':') { | |
117 | Some(pos) => { | |
118 | let (username, ticket) = line.split_at(pos); | |
119 | Ok((username.into(), ticket[1..].into())) | |
120 | } | |
121 | None => io_bail!("authentication data is invalid"), | |
122 | } | |
123 | } | |
124 | ||
125 | fn authenticate( | |
126 | username: &[u8], | |
127 | ticket: &[u8], | |
128 | path: &str, | |
129 | perm: Option<&str>, | |
130 | authport: u16, | |
131 | port: Option<u16>, | |
132 | ) -> Result<()> { | |
133 | let mut curl = Easy::new(); | |
134 | curl.url(&format!( | |
135 | "http://localhost:{}/api2/json/access/ticket", | |
136 | authport | |
137 | ))?; | |
138 | ||
139 | let username = curl.url_encode(username); | |
140 | let ticket = curl.url_encode(ticket); | |
141 | let path = curl.url_encode(path.as_bytes()); | |
142 | ||
143 | let mut post_fields = Vec::with_capacity(5); | |
144 | post_fields.push(format!("username={}", username)); | |
145 | post_fields.push(format!("password={}", ticket)); | |
146 | post_fields.push(format!("path={}", path)); | |
147 | ||
148 | if let Some(perm) = perm { | |
149 | let perm = curl.url_encode(perm.as_bytes()); | |
150 | post_fields.push(format!("privs={}", perm)); | |
151 | } | |
152 | ||
153 | if let Some(port) = port { | |
154 | post_fields.push(format!("port={}", port)); | |
155 | } | |
156 | ||
157 | curl.post_fields_copy(post_fields.join("&").as_bytes())?; | |
158 | curl.post(true)?; | |
159 | curl.perform()?; | |
160 | ||
161 | let response_code = curl.response_code()?; | |
162 | ||
163 | if response_code != 200 { | |
164 | io_bail!("invalid authentication, code {}", response_code); | |
165 | } | |
166 | ||
167 | Ok(()) | |
168 | } | |
169 | ||
170 | fn listen_and_accept( | |
171 | hostname: &str, | |
172 | port: u64, | |
173 | port_as_fd: bool, | |
174 | timeout: Duration, | |
175 | ) -> Result<(TcpStream, u16)> { | |
176 | let listener = if port_as_fd { | |
177 | unsafe { std::net::TcpListener::from_raw_fd(port as i32) } | |
178 | } else { | |
179 | std::net::TcpListener::bind((hostname, port as u16))? | |
180 | }; | |
181 | let port = listener.local_addr()?.port(); | |
c2d63828 DC |
182 | let mut listener = TcpListener::from_std(listener); |
183 | let mut poll = Poll::new()?; | |
3e4311fe | 184 | |
c2d63828 | 185 | poll.registry().register(&mut listener, Token(0), Interest::READABLE)?; |
3e4311fe DC |
186 | |
187 | let mut events = Events::with_capacity(1); | |
188 | ||
189 | let mut timeout = timeout; | |
190 | loop { | |
191 | let now = Instant::now(); | |
192 | poll.poll(&mut events, Some(timeout))?; | |
193 | let elapsed = now.elapsed(); | |
194 | if !events.is_empty() { | |
c2d63828 | 195 | let (stream, client) = listener.accept()?; |
3e4311fe DC |
196 | println!("client connection: {:?}", client); |
197 | return Ok((stream, port)); | |
198 | } | |
199 | if timeout >= elapsed { | |
200 | timeout -= elapsed; | |
201 | } else { | |
202 | io_bail!("timed out"); | |
203 | } | |
204 | } | |
205 | } | |
206 | ||
207 | fn run_pty(cmd: &OsStr, params: clap::OsValues) -> Result<PTY> { | |
208 | let (mut pty, secondary_name) = PTY::new().map_err(io_err_other)?; | |
209 | ||
210 | let mut filtered_env: HashMap<OsString, OsString> = std::env::vars_os() | |
211 | .filter(|&(ref k, _)| { | |
212 | k == "PATH" | |
213 | || k == "USER" | |
214 | || k == "HOME" | |
215 | || k == "LANG" | |
216 | || k == "LANGUAGE" | |
217 | || k.to_string_lossy().starts_with("LC_") | |
218 | }) | |
219 | .collect(); | |
220 | filtered_env.insert("TERM".into(), "xterm-256color".into()); | |
221 | ||
222 | let mut command = Command::new(cmd); | |
223 | ||
224 | command.args(params).env_clear().envs(&filtered_env); | |
225 | ||
226 | unsafe { | |
227 | command.pre_exec(move || { | |
228 | make_controlling_terminal(&secondary_name).map_err(io_err_other)?; | |
229 | Ok(()) | |
230 | }); | |
231 | } | |
232 | ||
233 | command.spawn()?; | |
234 | ||
235 | pty.set_size(80, 20).map_err(|x| x.as_errno().unwrap())?; | |
236 | Ok(pty) | |
237 | } | |
238 | ||
239 | const TCP: Token = Token(0); | |
240 | const PTY: Token = Token(1); | |
241 | ||
242 | fn do_main() -> Result<()> { | |
243 | let matches = App::new("termproxy") | |
244 | .setting(AppSettings::TrailingVarArg) | |
245 | .arg(Arg::with_name("port").takes_value(true).required(true)) | |
246 | .arg( | |
247 | Arg::with_name("authport") | |
248 | .takes_value(true) | |
249 | .long("authport"), | |
250 | ) | |
251 | .arg(Arg::with_name("use-port-as-fd").long("port-as-fd")) | |
252 | .arg( | |
253 | Arg::with_name("path") | |
254 | .takes_value(true) | |
255 | .long("path") | |
256 | .required(true), | |
257 | ) | |
258 | .arg(Arg::with_name("perm").takes_value(true).long("perm")) | |
259 | .arg(Arg::with_name("cmd").multiple(true).required(true)) | |
260 | .get_matches(); | |
261 | ||
262 | let port: u64 = matches | |
263 | .value_of("port") | |
264 | .unwrap() | |
265 | .parse() | |
266 | .map_err(io_err_other)?; | |
267 | let path = matches.value_of("path").unwrap(); | |
268 | let perm: Option<&str> = matches.value_of("perm"); | |
269 | let mut cmdparams = matches.values_of_os("cmd").unwrap(); | |
270 | let cmd = cmdparams.next().unwrap(); | |
271 | let authport: u16 = matches | |
272 | .value_of("authport") | |
273 | .unwrap_or("85") | |
274 | .parse() | |
275 | .map_err(io_err_other)?; | |
276 | let mut pty_buf = ByteBuffer::new(); | |
277 | let mut tcp_buf = ByteBuffer::new(); | |
278 | ||
279 | let use_port_as_fd = matches.is_present("use-port-as-fd"); | |
280 | ||
281 | if use_port_as_fd && port > u16::MAX as u64 { | |
282 | return Err(io_format_err!("port too big")); | |
283 | } else if port > i32::MAX as u64 { | |
284 | return Err(io_format_err!("Invalid FD number")); | |
285 | } | |
286 | ||
c2d63828 | 287 | let (mut tcp_handle, port) = |
3e4311fe DC |
288 | listen_and_accept("localhost", port, use_port_as_fd, Duration::new(10, 0)) |
289 | .map_err(|err| io_format_err!("failed waiting for client: {}", err))?; | |
290 | ||
c2d63828 | 291 | let (username, ticket) = read_ticket_line(&mut tcp_handle, &mut pty_buf, Duration::new(10, 0)) |
3e4311fe DC |
292 | .map_err(|err| io_format_err!("failed reading ticket: {}", err))?; |
293 | let port = if use_port_as_fd { Some(port) } else { None }; | |
294 | authenticate(&username, &ticket, path, perm, authport, port)?; | |
c2d63828 | 295 | tcp_handle.write_all(b"OK").expect("error writing response"); |
3e4311fe | 296 | |
c2d63828 | 297 | let mut poll = Poll::new()?; |
3e4311fe DC |
298 | let mut events = Events::with_capacity(128); |
299 | ||
300 | let mut pty = run_pty(cmd, cmdparams)?; | |
301 | ||
c2d63828 DC |
302 | poll.registry().register( |
303 | &mut tcp_handle, | |
3e4311fe | 304 | TCP, |
c2d63828 | 305 | Interest::READABLE.add(Interest::WRITABLE) |
3e4311fe | 306 | )?; |
c2d63828 DC |
307 | poll.registry().register( |
308 | &mut SourceFd(&pty.as_raw_fd()), | |
3e4311fe | 309 | PTY, |
c2d63828 | 310 | Interest::READABLE.add(Interest::WRITABLE) |
3e4311fe DC |
311 | )?; |
312 | ||
313 | let mut tcp_writable = true; | |
314 | let mut pty_writable = true; | |
315 | let mut tcp_readable = true; | |
316 | let mut pty_readable = true; | |
317 | let mut remaining = 0; | |
318 | let mut finished = false; | |
319 | ||
320 | while !finished { | |
321 | if tcp_readable && !pty_buf.is_full() || pty_readable && !tcp_buf.is_full() { | |
322 | poll.poll(&mut events, Some(Duration::new(0, 0)))?; | |
323 | } else { | |
324 | poll.poll(&mut events, None)?; | |
325 | } | |
326 | ||
327 | for event in &events { | |
c2d63828 DC |
328 | let writable = event.is_writable(); |
329 | let readable = event.is_readable(); | |
330 | if event.is_read_closed() { | |
3e4311fe DC |
331 | finished = true; |
332 | } | |
333 | match event.token() { | |
334 | TCP => { | |
335 | if readable { | |
336 | tcp_readable = true; | |
337 | } | |
338 | if writable { | |
339 | tcp_writable = true; | |
340 | } | |
341 | } | |
342 | PTY => { | |
343 | if readable { | |
344 | pty_readable = true; | |
345 | } | |
346 | if writable { | |
347 | pty_writable = true; | |
348 | } | |
349 | } | |
350 | _ => unreachable!(), | |
351 | } | |
352 | } | |
353 | ||
354 | while tcp_readable && !pty_buf.is_full() { | |
355 | let bytes = match pty_buf.read_from(&mut tcp_handle) { | |
356 | Ok(bytes) => bytes, | |
357 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
358 | tcp_readable = false; | |
359 | break; | |
360 | } | |
361 | Err(err) => { | |
362 | if !finished { | |
363 | return Err(io_format_err!("error reading from tcp: {}", err)); | |
364 | } | |
365 | break; | |
366 | } | |
367 | }; | |
368 | if bytes == 0 { | |
369 | finished = true; | |
370 | break; | |
371 | } | |
372 | } | |
373 | ||
374 | while pty_readable && !tcp_buf.is_full() { | |
375 | let bytes = match tcp_buf.read_from(&mut pty) { | |
376 | Ok(bytes) => bytes, | |
377 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
378 | pty_readable = false; | |
379 | break; | |
380 | } | |
381 | Err(err) => { | |
382 | if !finished { | |
383 | return Err(io_format_err!("error reading from pty: {}", err)); | |
384 | } | |
385 | break; | |
386 | } | |
387 | }; | |
388 | if bytes == 0 { | |
389 | finished = true; | |
390 | break; | |
391 | } | |
392 | } | |
393 | ||
394 | while !tcp_buf.is_empty() && tcp_writable { | |
395 | let bytes = match tcp_handle.write(&tcp_buf[..]) { | |
396 | Ok(bytes) => bytes, | |
397 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
398 | tcp_writable = false; | |
399 | break; | |
400 | } | |
401 | Err(err) => { | |
402 | if !finished { | |
403 | return Err(io_format_err!("error writing to tcp : {}", err)); | |
404 | } | |
405 | break; | |
406 | } | |
407 | }; | |
408 | tcp_buf.consume(bytes); | |
409 | } | |
410 | ||
411 | while !pty_buf.is_empty() && pty_writable { | |
412 | if remaining == 0 { | |
413 | remaining = match process_queue(&mut pty_buf, &mut pty) { | |
414 | Some(val) => val, | |
415 | None => break, | |
416 | }; | |
417 | } | |
418 | let len = min(remaining, pty_buf.len()); | |
419 | let bytes = match pty.write(&pty_buf[..len]) { | |
420 | Ok(bytes) => bytes, | |
421 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
422 | pty_writable = false; | |
423 | break; | |
424 | } | |
425 | Err(err) => { | |
426 | if !finished { | |
427 | return Err(io_format_err!("error writing to pty : {}", err)); | |
428 | } | |
429 | break; | |
430 | } | |
431 | }; | |
432 | remaining -= bytes; | |
433 | pty_buf.consume(bytes); | |
434 | } | |
435 | } | |
436 | ||
437 | Ok(()) | |
438 | } | |
439 | ||
440 | fn main() { | |
441 | std::process::exit(match do_main() { | |
442 | Ok(_) => 0, | |
443 | Err(err) => { | |
444 | eprintln!("{}", err); | |
445 | 1 | |
446 | } | |
447 | }); | |
448 | } |