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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},
ConcurrencyLimiters,
};
use directory::Permission;
use imap::op::authenticate::{decode_challenge_oauth, decode_challenge_plain};
use jmap::auth::{
authenticate::Authenticator, oauth::token::TokenHandler, 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())
.ok_or("Failed to decode challenge.")
.and_then(|challenge| {
if mechanism == Mechanism::Plain {
decode_challenge_plain(&challenge)
} else {
decode_challenge_oauth(&challenge)
}
})
.map_err(|err| trc::AuthEvent::Error.into_err().details(err))?;
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 = match credentials {
Credentials::Plain { username, secret } | Credentials::XOauth2 { username, secret } => {
self.server
.authenticate_plain(&username, &secret, self.remote_addr, self.session_id)
.await
}
Credentials::OAuthBearer { token } => {
match self
.server
.validate_access_token("access_token", &token)
.await
{
Ok((account_id, _, _)) => self.server.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,
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
})?;
// 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::Pop3Authenticate)?;
// Cache access token
let access_token = Arc::new(access_token);
self.server.cache_access_token(access_token.clone());
// 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()
}
}
|
