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/*
* SPDX-FileCopyrightText: 2020 Stalwart Labs Ltd <hello@stalw.art>
*
* SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
*/
use std::sync::Arc;
use common::{auth::AuthRequest, listener::limiter::InFlight, Server};
use hyper::header;
use mail_parser::decoders::base64::base64_decode;
use mail_send::Credentials;
use utils::map::ttl_dashmap::TtlMap;
use crate::api::{http::HttpSessionData, HttpRequest};
use common::auth::AccessToken;
use std::future::Future;
use super::rate_limit::RateLimiter;
pub trait Authenticator: Sync + Send {
fn authenticate_headers(
&self,
req: &HttpRequest,
session: &HttpSessionData,
allow_api_access: bool,
) -> impl Future<Output = trc::Result<(InFlight, Arc<AccessToken>)>> + Send;
}
impl Authenticator for Server {
async fn authenticate_headers(
&self,
req: &HttpRequest,
session: &HttpSessionData,
allow_api_access: bool,
) -> trc::Result<(InFlight, Arc<AccessToken>)> {
if let Some((mechanism, token)) = req.authorization() {
let access_token =
if let Some(account_id) = self.inner.data.http_auth_cache.get_with_ttl(token) {
self.get_cached_access_token(account_id).await?
} else {
let credentials = if mechanism.eq_ignore_ascii_case("basic") {
// Throttle authentication requests
self.is_auth_allowed_soft(&session.remote_ip).await?;
// Decode the base64 encoded credentials
decode_plain_auth(token).ok_or_else(|| {
trc::AuthEvent::Error
.into_err()
.details("Failed to decode Basic auth request.")
.id(token.to_string())
.caused_by(trc::location!())
})?
} else if mechanism.eq_ignore_ascii_case("bearer") {
// Enforce anonymous rate limit
self.is_anonymous_allowed(&session.remote_ip).await?;
decode_bearer_token(token, allow_api_access).ok_or_else(|| {
trc::AuthEvent::Error
.into_err()
.details("Failed to decode Bearer token.")
.id(token.to_string())
.caused_by(trc::location!())
})?
} else {
// Enforce anonymous rate limit
self.is_anonymous_allowed(&session.remote_ip).await?;
return Err(trc::AuthEvent::Error
.into_err()
.reason("Unsupported authentication mechanism.")
.details(token.to_string())
.caused_by(trc::location!()));
};
// Authenticate
let access_token = match self
.authenticate(&AuthRequest::from_credentials(
credentials,
session.session_id,
session.remote_ip,
))
.await
{
Ok(access_token) => access_token,
Err(err) => {
if err.matches(trc::EventType::Auth(trc::AuthEvent::Failed)) {
let _ = self.is_auth_allowed_hard(&session.remote_ip).await;
}
return Err(err);
}
};
// Cache session
self.cache_session(token.to_string(), &access_token);
access_token
};
// Enforce authenticated rate limit
self.is_account_allowed(&access_token)
.await
.map(|in_flight| (in_flight, access_token))
} else {
// Enforce anonymous rate limit
self.is_anonymous_allowed(&session.remote_ip).await?;
Err(trc::AuthEvent::Failed
.into_err()
.details("Missing Authorization header.")
.caused_by(trc::location!()))
}
}
}
pub trait HttpHeaders {
fn authorization(&self) -> Option<(&str, &str)>;
fn authorization_basic(&self) -> Option<&str>;
}
impl HttpHeaders for HttpRequest {
fn authorization(&self) -> Option<(&str, &str)> {
self.headers()
.get(header::AUTHORIZATION)
.and_then(|h| h.to_str().ok())
.and_then(|h| h.split_once(' ').map(|(l, t)| (l, t.trim())))
}
fn authorization_basic(&self) -> Option<&str> {
self.authorization().and_then(|(l, t)| {
if l.eq_ignore_ascii_case("basic") {
Some(t)
} else {
None
}
})
}
}
fn decode_plain_auth(token: &str) -> Option<Credentials<String>> {
base64_decode(token.as_bytes())
.and_then(|token| String::from_utf8(token).ok())
.and_then(|token| {
token
.split_once(':')
.map(|(login, secret)| Credentials::Plain {
username: login.trim().to_lowercase(),
secret: secret.to_string(),
})
})
}
fn decode_bearer_token(token: &str, allow_api_access: bool) -> Option<Credentials<String>> {
if allow_api_access {
if let Some(token) = token.strip_prefix("api_") {
return decode_plain_auth(token);
}
}
Some(Credentials::OAuthBearer {
token: token.to_string(),
})
}
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