tokio_xmpp/client/
login.rs

1use alloc::borrow::Cow;
2use core::str::FromStr;
3use futures::{SinkExt, StreamExt};
4use sasl::client::mechanisms::{Anonymous, Plain, Scram};
5use sasl::client::Mechanism;
6use sasl::common::scram::{Sha1, Sha256};
7use sasl::common::Credentials;
8use std::collections::BTreeSet;
9use std::io;
10use tokio::io::{AsyncBufRead, AsyncWrite};
11use xmpp_parsers::{
12    jid::Jid,
13    ns,
14    sasl::{Auth, Mechanism as XMPPMechanism, Nonza, Response},
15    stream_features::StreamFeatures,
16};
17
18use crate::{
19    connect::ServerConnector,
20    error::{AuthError, Error, ProtocolError},
21    xmlstream::{
22        xmpp::XmppStreamElement, InitiatingStream, ReadError, StreamHeader, Timeouts, XmppStream,
23    },
24};
25
26pub async fn auth<S: AsyncBufRead + AsyncWrite + Unpin>(
27    mut stream: XmppStream<S>,
28    sasl_mechanisms: BTreeSet<String>,
29    creds: Credentials,
30) -> Result<InitiatingStream<S>, Error> {
31    let local_mechs: Vec<Box<dyn Fn() -> Box<dyn Mechanism + Send + Sync> + Send>> = vec![
32        Box::new(|| Box::new(Scram::<Sha256>::from_credentials(creds.clone()).unwrap())),
33        Box::new(|| Box::new(Scram::<Sha1>::from_credentials(creds.clone()).unwrap())),
34        Box::new(|| Box::new(Plain::from_credentials(creds.clone()).unwrap())),
35        Box::new(|| Box::new(Anonymous::new())),
36    ];
37
38    for local_mech in local_mechs {
39        let mut mechanism = local_mech();
40        if sasl_mechanisms.contains(mechanism.name()) {
41            let initial = mechanism.initial();
42            let mechanism_name =
43                XMPPMechanism::from_str(mechanism.name()).map_err(ProtocolError::Parsers)?;
44
45            stream
46                .send(&XmppStreamElement::Sasl(Nonza::Auth(Auth {
47                    mechanism: mechanism_name,
48                    data: initial,
49                })))
50                .await?;
51
52            loop {
53                match stream.next().await {
54                    Some(Ok(XmppStreamElement::Sasl(sasl))) => match sasl {
55                        Nonza::Challenge(challenge) => {
56                            let response = mechanism
57                                .response(&challenge.data)
58                                .map_err(AuthError::Sasl)?;
59
60                            // Send response and loop
61                            stream
62                                .send(&XmppStreamElement::Sasl(Nonza::Response(Response {
63                                    data: response,
64                                })))
65                                .await?;
66                        }
67                        Nonza::Success(_) => return Ok(stream.initiate_reset()),
68                        Nonza::Failure(failure) => {
69                            return Err(Error::Auth(AuthError::Fail(failure.defined_condition)));
70                        }
71                        _ => {
72                            // Ignore?!
73                        }
74                    },
75                    Some(Ok(el)) => {
76                        return Err(io::Error::new(
77                            io::ErrorKind::InvalidData,
78                            format!(
79                                "unexpected stream element during SASL negotiation: {:?}",
80                                el
81                            ),
82                        )
83                        .into())
84                    }
85                    Some(Err(ReadError::HardError(e))) => return Err(e.into()),
86                    Some(Err(ReadError::ParseError(e))) => {
87                        return Err(io::Error::new(io::ErrorKind::InvalidData, e).into())
88                    }
89                    Some(Err(ReadError::SoftTimeout)) => {
90                        // We cannot do anything about soft timeouts here...
91                    }
92                    Some(Err(ReadError::StreamFooterReceived)) | None => {
93                        return Err(Error::Disconnected)
94                    }
95                }
96            }
97        }
98    }
99
100    Err(AuthError::NoMechanism.into())
101}
102
103/// Authenticate to an XMPP server, but do not bind a resource.
104pub async fn client_auth<C: ServerConnector>(
105    server: C,
106    jid: Jid,
107    password: String,
108    timeouts: Timeouts,
109) -> Result<(StreamFeatures, XmppStream<C::Stream>), Error> {
110    let username = jid.node().unwrap().as_str();
111
112    let (xmpp_stream, channel_binding) = server.connect(&jid, ns::JABBER_CLIENT, timeouts).await?;
113    let (features, xmpp_stream) = xmpp_stream.recv_features().await?;
114
115    let creds = Credentials::default()
116        .with_username(username)
117        .with_password(password)
118        .with_channel_binding(channel_binding);
119    // Authenticated (unspecified) stream
120    let stream = auth(xmpp_stream, features.sasl_mechanisms, creds).await?;
121    let stream = stream
122        .send_header(StreamHeader {
123            to: Some(Cow::Borrowed(jid.domain().as_str())),
124            from: None,
125            id: None,
126        })
127        .await?;
128    Ok(stream.recv_features().await?)
129}
tokio_xmpp/client/login.rs

tokio_xmpp/client/
login.rs
