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|
use futures::Future;
use rand::prelude::*;
use super::types::*;
use super::decode::auth_plain;
#[derive(Debug)]
pub enum AuthRes {
Success(String),
Failed(Option<String>, Option<FailCode>),
}
#[derive(Debug)]
pub enum State {
Error,
Init,
HandshakePart(Version),
HandshakeDone,
AuthPlainProgress { id: u64 },
AuthDone { id: u64, res: AuthRes },
}
const SERVER_MAJOR: u64 = 1;
const SERVER_MINOR: u64 = 2;
const EMPTY_AUTHZ: &[u8] = &[];
impl State {
pub fn new() -> Self {
Self::Init
}
async fn try_auth_plain<X, F>(&self, data: &[u8], login: X) -> AuthRes
where
X: FnOnce(String, String) -> F,
F: Future<Output=bool>,
{
// Check that we can extract user's login+pass
let (ubin, pbin) = match auth_plain(&data) {
Ok(([], (authz, user, pass))) if authz == user || authz == EMPTY_AUTHZ => (user, pass),
Ok(_) => {
tracing::error!("Impersonating user is not supported");
return AuthRes::Failed(None, None);
}
Err(e) => {
tracing::error!(err=?e, "Could not parse the SASL PLAIN data chunk");
return AuthRes::Failed(None, None);
}
};
// Try to convert it to UTF-8
let (user, password) = match (std::str::from_utf8(ubin), std::str::from_utf8(pbin)) {
(Ok(u), Ok(p)) => (u, p),
_ => {
tracing::error!("Username or password contain invalid UTF-8 characters");
return AuthRes::Failed(None, None);
}
};
// Try to connect user
match login(user.to_string(), password.to_string()).await {
true => AuthRes::Success(user.to_string()),
false => {
tracing::warn!("login failed");
AuthRes::Failed(Some(user.to_string()), None)
}
}
}
pub async fn progress<F,X>(&mut self, cmd: ClientCommand, login: X)
where
X: FnOnce(String, String) -> F,
F: Future<Output=bool>,
{
let new_state = 'state: {
match (std::mem::replace(self, State::Error), cmd) {
(Self::Init, ClientCommand::Version(v)) => Self::HandshakePart(v),
(Self::HandshakePart(version), ClientCommand::Cpid(_cpid)) => {
if version.major != SERVER_MAJOR {
tracing::error!(
client_major = version.major,
server_major = SERVER_MAJOR,
"Unsupported client major version"
);
break 'state Self::Error;
}
Self::HandshakeDone
}
(
Self::HandshakeDone { .. },
ClientCommand::Auth {
id, mech, options, ..
},
)
| (
Self::AuthDone { .. },
ClientCommand::Auth {
id, mech, options, ..
},
) => {
if mech != Mechanism::Plain {
tracing::error!(mechanism=?mech, "Unsupported Authentication Mechanism");
break 'state Self::AuthDone {
id,
res: AuthRes::Failed(None, None),
};
}
match options.last() {
Some(AuthOption::Resp(data)) => Self::AuthDone {
id,
res: self.try_auth_plain(&data, login).await,
},
_ => Self::AuthPlainProgress { id },
}
}
(Self::AuthPlainProgress { id }, ClientCommand::Cont { id: cid, data }) => {
// Check that ID matches
if cid != id {
tracing::error!(
auth_id = id,
cont_id = cid,
"CONT id does not match AUTH id"
);
break 'state Self::AuthDone {
id,
res: AuthRes::Failed(None, None),
};
}
Self::AuthDone {
id,
res: self.try_auth_plain(&data, login).await,
}
}
_ => {
tracing::error!("This command is not valid in this context");
Self::Error
}
}
};
tracing::debug!(state=?new_state, "Made progress");
*self = new_state;
}
pub fn response(&self) -> Vec<ServerCommand> {
let mut srv_cmd: Vec<ServerCommand> = Vec::new();
match self {
Self::HandshakeDone { .. } => {
srv_cmd.push(ServerCommand::Version(Version {
major: SERVER_MAJOR,
minor: SERVER_MINOR,
}));
srv_cmd.push(ServerCommand::Mech {
kind: Mechanism::Plain,
parameters: vec![MechanismParameters::PlainText],
});
srv_cmd.push(ServerCommand::Spid(15u64));
srv_cmd.push(ServerCommand::Cuid(19350u64));
let mut cookie = [0u8; 16];
thread_rng().fill(&mut cookie);
srv_cmd.push(ServerCommand::Cookie(cookie));
srv_cmd.push(ServerCommand::Done);
}
Self::AuthPlainProgress { id } => {
srv_cmd.push(ServerCommand::Cont {
id: *id,
data: None,
});
}
Self::AuthDone {
id,
res: AuthRes::Success(user),
} => {
srv_cmd.push(ServerCommand::Ok {
id: *id,
user_id: Some(user.to_string()),
extra_parameters: vec![],
});
}
Self::AuthDone {
id,
res: AuthRes::Failed(maybe_user, maybe_failcode),
} => {
srv_cmd.push(ServerCommand::Fail {
id: *id,
user_id: maybe_user.clone(),
code: maybe_failcode.clone(),
extra_parameters: vec![],
});
}
_ => (),
};
srv_cmd
}
}
|
