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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::SessionStream,
};
use directory::Permission;
use imap_proto::{
protocol::{authenticate::Mechanism, capability::Capability},
receiver::{self, Request},
Command, ResponseCode, StatusResponse,
};
use jmap::auth::rate_limit::RateLimiter;
use mail_parser::decoders::base64::base64_decode;
use mail_send::Credentials;
use std::sync::Arc;
use crate::core::{Session, SessionData, State};
impl<T: SessionStream> Session<T> {
pub async fn handle_authenticate(&mut self, request: Request<Command>) -> trc::Result<()> {
let mut args = request.parse_authenticate()?;
match args.mechanism {
Mechanism::Plain | Mechanism::OAuthBearer => {
if !args.params.is_empty() {
let challenge = base64_decode(args.params.pop().unwrap().as_bytes())
.ok_or_else(|| {
trc::AuthEvent::Error
.into_err()
.details("Failed to decode challenge.")
.id(args.tag.clone())
.code(ResponseCode::Parse)
})?;
let credentials = if args.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.")
.id(args.tag.clone())
})?;
self.authenticate(credentials, args.tag).await
} else {
self.receiver.request = receiver::Request {
tag: args.tag,
command: Command::Authenticate,
tokens: vec![receiver::Token::Argument(args.mechanism.into_bytes())],
};
self.receiver.state = receiver::State::Argument { last_ch: b' ' };
self.write_bytes(b"+ \"\"\r\n".to_vec()).await
}
}
_ => Err(trc::AuthEvent::Error
.into_err()
.details("Authentication mechanism not supported.")
.id(args.tag)
.code(ResponseCode::Cannot)),
}
}
pub async fn authenticate(
&mut self,
credentials: Credentials<String>,
tag: String,
) -> trc::Result<()> {
// Throttle authentication requests
self.server
.is_auth_allowed_soft(&self.remote_addr)
.await
.map_err(|err| err.id(tag.clone()))?;
// 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)) {
let auth_failures = self.state.auth_failures();
if auth_failures < self.server.core.imap.max_auth_failures {
self.state = State::NotAuthenticated {
auth_failures: auth_failures + 1,
};
} else {
return trc::AuthEvent::TooManyAttempts.into_err().caused_by(err);
}
}
err.id(tag.clone())
})
.and_then(|token| {
token
.assert_has_permission(Permission::ImapAuthenticate)
.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()
.id(tag.clone()));
}
};
// Create session
self.state = State::Authenticated {
data: Arc::new(
SessionData::new(self, access_token, in_flight)
.await
.map_err(|err| err.id(tag.clone()))?,
),
};
self.write_bytes(
StatusResponse::ok("Authentication successful")
.with_code(ResponseCode::Capability {
capabilities: Capability::all_capabilities(
true,
!self.is_tls && self.instance.acceptor.is_tls(),
),
})
.with_tag(tag)
.into_bytes(),
)
.await
}
pub async fn handle_unauthenticate(&mut self, request: Request<Command>) -> trc::Result<()> {
self.state = State::NotAuthenticated { auth_failures: 0 };
self.write_bytes(
StatusResponse::completed(Command::Unauthenticate)
.with_tag(request.tag)
.into_bytes(),
)
.await
}
}
|
