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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::listener::{limiter::ConcurrencyLimiter, SessionStream};
use directory::Permission;
use imap::op::authenticate::{decode_challenge_oauth, decode_challenge_plain};
use imap_proto::{
protocol::authenticate::Mechanism,
receiver::{self, Request},
};
use jmap::auth::rate_limit::ConcurrencyLimiters;
use mail_parser::decoders::base64::base64_decode;
use mail_send::Credentials;
use std::sync::Arc;
use crate::core::{Command, Session, State, StatusResponse};
impl<T: SessionStream> Session<T> {
pub async fn handle_authenticate(&mut self, request: Request<Command>) -> trc::Result<Vec<u8>> {
if request.tokens.is_empty() {
return Err(trc::AuthEvent::Error
.into_err()
.details("Authentication mechanism missing."));
}
let mut tokens = request.tokens.into_iter();
let mechanism = Mechanism::parse(&tokens.next().unwrap().unwrap_bytes())
.map_err(|err| trc::AuthEvent::Error.into_err().details(err))?;
let mut params: Vec<String> = tokens
.filter_map(|token| token.unwrap_string().ok())
.collect();
let credentials = match mechanism {
Mechanism::Plain | Mechanism::OAuthBearer => {
if !params.is_empty() {
let challenge =
base64_decode(params.pop().unwrap().as_bytes()).ok_or_else(|| {
trc::AuthEvent::Error
.into_err()
.details("Failed to decode challenge.")
})?;
(if mechanism == Mechanism::Plain {
decode_challenge_plain(&challenge)
} else {
decode_challenge_oauth(&challenge)
}
.map_err(|err| trc::AuthEvent::Error.into_err().details(err)))?
} else {
self.receiver.request = receiver::Request {
tag: String::new(),
command: Command::Authenticate,
tokens: vec![receiver::Token::Argument(mechanism.into_bytes())],
};
self.receiver.state = receiver::State::Argument { last_ch: b' ' };
return Ok(b"{0}\r\n".to_vec());
}
}
_ => {
return Err(trc::AuthEvent::Error
.into_err()
.details("Authentication mechanism not supported."))
}
};
// Throttle authentication requests
self.jmap.is_auth_allowed_soft(&self.remote_addr).await?;
// Authenticate
let access_token = match credentials {
Credentials::Plain { username, secret } | Credentials::XOauth2 { username, secret } => {
self.jmap
.authenticate_plain(&username, &secret, self.remote_addr, self.session_id)
.await
}
Credentials::OAuthBearer { token } => {
match self
.jmap
.validate_access_token("access_token", &token)
.await
{
Ok((account_id, _, _)) => self.jmap.core.get_access_token(account_id).await,
Err(err) => Err(err),
}
}
}
.map_err(|err| {
if err.matches(trc::EventType::Auth(trc::AuthEvent::Failed)) {
match &self.state {
State::NotAuthenticated { auth_failures }
if *auth_failures < self.jmap.core.imap.max_auth_failures =>
{
self.state = State::NotAuthenticated {
auth_failures: auth_failures + 1,
};
}
_ => {
return trc::AuthEvent::TooManyAttempts.into_err().caused_by(err);
}
}
}
err
})?;
// 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());
}
};
// Validate access
access_token.assert_has_permission(Permission::SieveAuthenticate)?;
// Cache access token
let access_token = Arc::new(access_token);
self.jmap.core.cache_access_token(access_token.clone());
// Create session
self.state = State::Authenticated {
access_token,
in_flight,
};
Ok(StatusResponse::ok("Authentication successful").into_bytes())
}
pub async fn handle_unauthenticate(&mut self) -> trc::Result<Vec<u8>> {
self.state = State::NotAuthenticated { auth_failures: 0 };
trc::event!(
ManageSieve(trc::ManageSieveEvent::Unauthenticate),
SpanId = self.session_id,
Elapsed = trc::Value::Duration(0)
);
Ok(StatusResponse::ok("Unauthenticate successful.").into_bytes())
}
pub fn get_concurrency_limiter(&self, account_id: u32) -> Option<Arc<ConcurrencyLimiters>> {
let rate = self.jmap.core.imap.rate_concurrent?;
self.imap
.rate_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.imap.rate_limiter.insert(account_id, limiter.clone());
limiter
})
.into()
}
}
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