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xmpp-proxy
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Fix ejabberd s2s

This commit is contained in:
Travis Burtrum 2021-04-14 02:09:00 -04:00
parent 3871589254
commit c160acb38f
2 changed files with 51 additions and 36 deletions
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51
src/main.rs
View File

@ -103,8 +103,10 @@ impl Config {
} }
} }
fn to_str(buf: &[u8]) -> &str { fn to_str(buf: &[u8]) -> std::borrow::Cow<'_, str> {
std::str::from_utf8(buf).unwrap_or("[invalid utf-8]") //&str {
//std::str::from_utf8(buf).unwrap_or("[invalid utf-8]")
String::from_utf8_lossy(buf)
} }
async fn handle_connection(mut stream: tokio::net::TcpStream, client_addr: SocketAddr, local_addr: SocketAddr, config: CloneableConfig) -> Result<()> { async fn handle_connection(mut stream: tokio::net::TcpStream, client_addr: SocketAddr, local_addr: SocketAddr, config: CloneableConfig) -> Result<()> {
@ -148,7 +150,11 @@ async fn handle_connection(mut stream: tokio::net::TcpStream, client_addr: Socke
if !direct_tls { if !direct_tls {
let mut stream_open = Vec::new(); let mut stream_open = Vec::new();
while let Ok(n) = stream.read(in_filter.current_buf()).await { let (in_rd, mut in_wr) = stream.split();
// we naively read 1 byte at a time, which buffering significantly speeds up
let mut in_rd = tokio::io::BufReader::with_capacity(IN_BUFFER_SIZE, in_rd);
while let Ok(n) = in_rd.read(in_filter.current_buf()).await {
if n == 0 { if n == 0 {
bail!("stream ended before open"); bail!("stream ended before open");
} }
@ -160,32 +166,36 @@ async fn handle_connection(mut stream: tokio::net::TcpStream, client_addr: Socke
continue; continue;
} else if buf.starts_with(b"<stream:stream ") { } else if buf.starts_with(b"<stream:stream ") {
debug!("> {} '{}'", client_addr, to_str(&stream_open)); debug!("> {} '{}'", client_addr, to_str(&stream_open));
stream.write_all(&stream_open).await?; in_wr.write_all(&stream_open).await?;
stream_open.clear(); stream_open.clear();
// gajim seems to REQUIRE an id here... // gajim seems to REQUIRE an id here...
let buf = if buf.contains_seq(b"id=") { let buf = if buf.contains_seq(b"id=") {
buf.replace(b" id='", b" id='xmpp-proxy") buf.replace_first(b" id='", b" id='xmpp-proxy")
.replace(br#" id=""#, br#" id="xmpp-proxy"#) .replace_first(br#" id=""#, br#" id="xmpp-proxy"#)
.replace(b" to=", br#" bla toblala="#) .replace_first(b" to=", br#" bla toblala="#)
.replace(b" from=", b" to=") .replace_first(b" from=", b" to=")
.replace(br#" bla toblala="#, br#" from="#) .replace_first(br#" bla toblala="#, br#" from="#)
} else { } else {
buf.replace(b" to=", br#" bla toblala="#) buf.replace_first(b" to=", br#" bla toblala="#)
.replace(b" from=", b" to=") .replace_first(b" from=", b" to=")
.replace(br#" bla toblala="#, br#" id='xmpp-proxy' from="#) .replace_first(br#" bla toblala="#, br#" id='xmpp-proxy' from="#)
}; };
debug!("> {} '{}'", client_addr, to_str(&buf)); debug!("> {} '{}'", client_addr, to_str(&buf));
stream.write_all(&buf).await?; in_wr.write_all(&buf).await?;
stream // ejabberd never sends <starttls/> with the first, only the second?
.write_all(br###"<features xmlns="http://etherx.jabber.org/streams"><starttls xmlns="urn:ietf:params:xml:ns:xmpp-tls"><required/></starttls></features>"###) //let buf = br###"<features xmlns="http://etherx.jabber.org/streams"><starttls xmlns="urn:ietf:params:xml:ns:xmpp-tls"><required/></starttls></features>"###;
.await?; let buf = br###"<stream:features><starttls xmlns="urn:ietf:params:xml:ns:xmpp-tls"><required/></starttls></stream:features>"###;
stream.flush().await?; debug!("> {} '{}'", client_addr, to_str(buf));
in_wr.write_all(buf).await?;
in_wr.flush().await?;
} else if buf.starts_with(b"<starttls ") { } else if buf.starts_with(b"<starttls ") {
stream.write_all(br###"<proceed xmlns="urn:ietf:params:xml:ns:xmpp-tls" />"###).await?; let buf = br###"<proceed xmlns="urn:ietf:params:xml:ns:xmpp-tls" />"###;
stream.flush().await?; debug!("> {} '{}'", client_addr, to_str(buf));
in_wr.write_all(buf).await?;
in_wr.flush().await?;
break; break;
} else { } else {
bail!("bad pre-tls stanza: {}", to_str(&buf)); bail!("bad pre-tls stanza: {}", to_str(&buf));
@ -197,7 +207,6 @@ async fn handle_connection(mut stream: tokio::net::TcpStream, client_addr: Socke
let stream = config.acceptor.accept(stream).await?; let stream = config.acceptor.accept(stream).await?;
let (in_rd, mut in_wr) = tokio::io::split(stream); let (in_rd, mut in_wr) = tokio::io::split(stream);
// we naively read 1 byte at a time, which buffering significantly speeds up // we naively read 1 byte at a time, which buffering significantly speeds up
let mut in_rd = tokio::io::BufReader::with_capacity(IN_BUFFER_SIZE, in_rd); let mut in_rd = tokio::io::BufReader::with_capacity(IN_BUFFER_SIZE, in_rd);
@ -396,7 +405,7 @@ impl StanzaFilter {
//println!("b: '{}', cnt: {}, tag_cnt: {}, self.buf.len(): {}", b as char, self.cnt, self.tag_cnt, self.buf.len()); //println!("b: '{}', cnt: {}, tag_cnt: {}, self.buf.len(): {}", b as char, self.cnt, self.tag_cnt, self.buf.len());
self.cnt += 1; self.cnt += 1;
if self.cnt == self.buf_size { if self.cnt == self.buf_size {
bail!("stanza too big"); bail!("stanza too big: {}", to_str(&self.buf));
} }
Ok(None) Ok(None)
} }

36
src/slicesubsequence.rs
View File

@ -3,7 +3,7 @@ use anyhow::{anyhow, Result};
pub trait SliceSubsequence<T> { pub trait SliceSubsequence<T> {
fn trim_start(&self, needle: &[T]) -> &[T]; fn trim_start(&self, needle: &[T]) -> &[T];
fn first_index_of(&self, needle: &[T]) -> Result<usize>; fn first_index_of(&self, needle: &[T]) -> Result<usize>;
fn replace(self, needle: &[T], replacement: &[T]) -> Vec<T>; fn replace_first(self, needle: &[T], replacement: &[T]) -> Vec<T>;
fn contains_seq(&self, needle: &[T]) -> bool { fn contains_seq(&self, needle: &[T]) -> bool {
self.first_index_of(needle).is_ok() self.first_index_of(needle).is_ok()
@ -36,8 +36,8 @@ impl<T: PartialEq + Clone> SliceSubsequence<T> for &[T] {
Err(anyhow!("not found")) Err(anyhow!("not found"))
} }
fn replace(self, needle: &[T], replacement: &[T]) -> Vec<T> { fn replace_first(self, needle: &[T], replacement: &[T]) -> Vec<T> {
self.to_vec().replace(needle, replacement) self.to_vec().replace_first(needle, replacement)
} }
} }
@ -50,11 +50,17 @@ impl<T: PartialEq + Clone> SliceSubsequence<T> for Vec<T> {
return (self.as_slice()).first_index_of(needle); return (self.as_slice()).first_index_of(needle);
} }
fn replace(mut self, needle: &[T], replacement: &[T]) -> Vec<T> { fn replace_first(self, needle: &[T], replacement: &[T]) -> Vec<T> {
while let Ok(idx) = self.first_index_of(needle) { if let Ok(idx) = self.first_index_of(needle) {
self.splice(idx..(idx + needle.len()), replacement.iter().cloned()); let second = &self[(idx + needle.len())..];
let mut ret = Vec::with_capacity(idx + replacement.len() + second.len());
ret.extend_from_slice(&self[..idx]);
ret.extend_from_slice(replacement);
ret.extend_from_slice(second);
ret
} else {
self
} }
self
} }
} }
@ -74,23 +80,23 @@ mod tests {
assert_eq!(buf, b"bla"); assert_eq!(buf, b"bla");
} }
#[test] #[test]
fn replace() { fn replace_first() {
let buf = b"bla to='tsnhaou' bla2".replace(b" to=", b" from="); let buf = b"bla to='tsnhaou' bla2".replace_first(b" to=", b" from=");
assert_eq!(buf, b"bla from='tsnhaou' bla2"); assert_eq!(buf, b"bla from='tsnhaou' bla2");
let buf = buf.replace(b" from=", b" to="); let buf = buf.replace_first(b" from=", b" to=");
assert_eq!(buf, b"bla to='tsnhaou' bla2"); assert_eq!(buf, b"bla to='tsnhaou' bla2");
let buf = buf.replace(b" to=", b" from="); let buf = buf.replace_first(b" to=", b" from=");
assert_eq!(buf, b"bla from='tsnhaou' bla2"); assert_eq!(buf, b"bla from='tsnhaou' bla2");
let buf = b"bla to='tsnhaou' bla2".replace(b"bla", b"boo"); let buf = b"bla to='tsnhaou' bla2".replace_first(b"bla", b"boo");
assert_eq!(buf, b"boo to='tsnhaou' boo2"); assert_eq!(buf, b"boo to='tsnhaou' bla2");
let buf = buf.replace(b"boo", b"bla"); let buf = buf.replace_first(b"boo", b"bla");
assert_eq!(buf, b"bla to='tsnhaou' bla2"); assert_eq!(buf, b"bla to='tsnhaou' bla2");
let buf = buf.replace(b" bla2", b""); let buf = buf.replace_first(b" bla2", b"");
assert_eq!(buf, b"bla to='tsnhaou'"); assert_eq!(buf, b"bla to='tsnhaou'");
} }
} }