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/*
* SPDX-FileCopyrightText: 2020 Stalwart Labs Ltd <hello@stalw.art>
*
* SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
*/
use common::{
auth::{
sasl::{sasl_decode_challenge_oauth, sasl_decode_challenge_plain},
AuthRequest,
},
listener::{limiter::ConcurrencyLimiter, SessionStream},
ConcurrencyLimiters,
};
use directory::Permission;
use jmap::auth::rate_limit::RateLimiter;
use mail_parser::decoders::base64::base64_decode;
use mail_send::Credentials;
use std::sync::Arc;
use crate::{
protocol::{request, Command, Mechanism},
Session, State,
};
impl<T: SessionStream> Session<T> {
pub async fn handle_sasl(
&mut self,
mechanism: Mechanism,
mut params: Vec<String>,
) -> trc::Result<()> {
match mechanism {
Mechanism::Plain | Mechanism::OAuthBearer => {
if !params.is_empty() {
let credentials = base64_decode(params.pop().unwrap().as_bytes())
.and_then(|challenge| {
if mechanism == Mechanism::Plain {
sasl_decode_challenge_plain(&challenge)
} else {
sasl_decode_challenge_oauth(&challenge)
}
})
.ok_or_else(|| {
trc::AuthEvent::Error
.into_err()
.details("Invalid SASL challenge")
})?;
self.handle_auth(credentials).await
} else {
// TODO: This hack is temporary until the SASL library is developed
self.receiver.state = request::State::Argument {
request: Command::Auth {
mechanism: mechanism.as_str().as_bytes().to_vec(),
params: vec![],
},
num: 1,
last_is_space: true,
};
self.write_bytes("+\r\n").await
}
}
_ => Err(trc::AuthEvent::Error
.into_err()
.details("Authentication mechanism not supported.")),
}
}
pub async fn handle_auth(&mut self, credentials: Credentials<String>) -> trc::Result<()> {
// Throttle authentication requests
self.server.is_auth_allowed_soft(&self.remote_addr).await?;
// Authenticate
let access_token = self
.server
.authenticate(&AuthRequest::from_credentials(
credentials,
self.session_id,
self.remote_addr,
))
.await
.map_err(|err| {
if err.matches(trc::EventType::Auth(trc::AuthEvent::Failed)) {
match &self.state {
State::NotAuthenticated {
auth_failures,
username,
} if *auth_failures < self.server.core.imap.max_auth_failures => {
self.state = State::NotAuthenticated {
auth_failures: auth_failures + 1,
username: username.clone(),
};
}
_ => {
return trc::AuthEvent::TooManyAttempts.into_err().caused_by(err);
}
}
}
err
})
.and_then(|token| {
token
.assert_has_permission(Permission::Pop3Authenticate)
.map(|_| token)
})?;
// Enforce concurrency limits
let in_flight = match self
.get_concurrency_limiter(access_token.primary_id())
.map(|limiter| limiter.concurrent_requests.is_allowed())
{
Some(Some(limiter)) => Some(limiter),
None => None,
Some(None) => {
return Err(trc::LimitEvent::ConcurrentRequest.into_err());
}
};
// Fetch mailbox
let mailbox = self.fetch_mailbox(access_token.primary_id()).await?;
// Create session
self.state = State::Authenticated {
in_flight,
mailbox,
access_token,
};
self.write_ok("Authentication successful").await
}
pub fn get_concurrency_limiter(&self, account_id: u32) -> Option<Arc<ConcurrencyLimiters>> {
let rate = self.server.core.imap.rate_concurrent?;
self.server
.inner
.data
.imap_limiter
.get(&account_id)
.map(|limiter| limiter.clone())
.unwrap_or_else(|| {
let limiter = Arc::new(ConcurrencyLimiters {
concurrent_requests: ConcurrencyLimiter::new(rate),
concurrent_uploads: ConcurrencyLimiter::new(rate),
});
self.server
.inner
.data
.imap_limiter
.insert(account_id, limiter.clone());
limiter
})
.into()
}
}
|
