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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::time::SystemTime;
use directory::{backend::internal::PrincipalField, QueryBy};
use mail_builder::encoders::base64::base64_encode;
use mail_parser::decoders::base64::base64_decode;
use store::{
blake3,
rand::{thread_rng, Rng},
};
use trc::AddContext;
use utils::codec::leb128::{Leb128Iterator, Leb128Vec};
use crate::Server;
use super::{crypto::SymmetricEncrypt, GrantType, CLIENT_ID_MAX_LEN, RANDOM_CODE_LEN};
pub struct TokenInfo {
pub grant_type: GrantType,
pub account_id: u32,
pub client_id: String,
pub expiry: u64,
pub issued_at: u64,
pub expires_in: u64,
}
const OAUTH_EPOCH: u64 = 946684800; // Jan 1, 2000
impl Server {
pub async fn encode_access_token(
&self,
grant_type: GrantType,
account_id: u32,
client_id: &str,
expiry_in: u64,
) -> trc::Result<String> {
// Build context
if client_id.len() > CLIENT_ID_MAX_LEN {
return Err(trc::AuthEvent::Error
.into_err()
.details("Client id too long"));
}
// Include password hash if expiration is over 1 hour
let password_hash = if expiry_in > 3600 {
self.password_hash(account_id)
.await
.caused_by(trc::location!())?
} else {
String::new()
};
let key = &self.core.jmap.oauth_key;
let context = format!(
"{} {} {} {}",
grant_type.as_str(),
client_id,
account_id,
password_hash
);
// Set expiration time
let issued_at = SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)
.map_or(0, |d| d.as_secs())
.saturating_sub(OAUTH_EPOCH); // Jan 1, 2000
let expiry = issued_at + expiry_in;
// Calculate nonce
let mut hasher = blake3::Hasher::new();
if !password_hash.is_empty() {
hasher.update(password_hash.as_bytes());
}
hasher.update(grant_type.as_str().as_bytes());
hasher.update(issued_at.to_be_bytes().as_slice());
hasher.update(expiry.to_be_bytes().as_slice());
let nonce = hasher
.finalize()
.as_bytes()
.iter()
.take(SymmetricEncrypt::NONCE_LEN)
.copied()
.collect::<Vec<_>>();
// Encrypt random bytes
let mut token = SymmetricEncrypt::new(key.as_bytes(), &context)
.encrypt(&thread_rng().gen::<[u8; RANDOM_CODE_LEN]>(), &nonce)
.map_err(|_| {
trc::AuthEvent::Error
.into_err()
.ctx(trc::Key::Reason, "Failed to encrypt token")
.caused_by(trc::location!())
})?;
token.push_leb128(account_id);
token.push(grant_type.id());
token.push_leb128(issued_at);
token.push_leb128(expiry);
token.extend_from_slice(client_id.as_bytes());
Ok(String::from_utf8(base64_encode(&token).unwrap_or_default()).unwrap())
}
pub async fn validate_access_token(
&self,
expected_grant_type: Option<GrantType>,
token_: &str,
) -> trc::Result<TokenInfo> {
// Base64 decode token
let token = base64_decode(token_.as_bytes()).ok_or_else(|| {
trc::AuthEvent::Error
.into_err()
.ctx(trc::Key::Reason, "Failed to decode token")
.caused_by(trc::location!())
.details(token_.to_string())
})?;
let (account_id, grant_type, issued_at, expiry, client_id) = token
.get((RANDOM_CODE_LEN + SymmetricEncrypt::ENCRYPT_TAG_LEN)..)
.and_then(|bytes| {
let mut bytes = bytes.iter();
(
bytes.next_leb128()?,
GrantType::from_id(bytes.next().copied()?)?,
bytes.next_leb128::<u64>()?,
bytes.next_leb128::<u64>()?,
bytes.copied().map(char::from).collect::<String>(),
)
.into()
})
.ok_or_else(|| {
trc::AuthEvent::Error
.into_err()
.ctx(trc::Key::Reason, "Failed to decode token")
.caused_by(trc::location!())
.details(token_.to_string())
})?;
// Validate expiration
let now = SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)
.map_or(0, |d| d.as_secs())
.saturating_sub(OAUTH_EPOCH); // Jan 1, 2000
if expiry <= now || issued_at > now {
return Err(trc::AuthEvent::TokenExpired.into_err());
}
// Validate grant type
if expected_grant_type.map_or(false, |g| g != grant_type) {
return Err(trc::AuthEvent::Error
.into_err()
.details("Invalid grant type"));
}
// Obtain password hash
let password_hash = if expiry - issued_at > 3600 {
self.password_hash(account_id)
.await
.map_err(|err| trc::AuthEvent::Error.into_err().ctx(trc::Key::Details, err))?
} else {
String::new()
};
// Build context
let key = self.core.jmap.oauth_key.clone();
let context = format!(
"{} {} {} {}",
grant_type.as_str(),
client_id,
account_id,
password_hash
);
// Calculate nonce
let mut hasher = blake3::Hasher::new();
if !password_hash.is_empty() {
hasher.update(password_hash.as_bytes());
}
hasher.update(grant_type.as_str().as_bytes());
hasher.update(issued_at.to_be_bytes().as_slice());
hasher.update(expiry.to_be_bytes().as_slice());
let nonce = hasher
.finalize()
.as_bytes()
.iter()
.take(SymmetricEncrypt::NONCE_LEN)
.copied()
.collect::<Vec<_>>();
// Decrypt
SymmetricEncrypt::new(key.as_bytes(), &context)
.decrypt(
&token[..RANDOM_CODE_LEN + SymmetricEncrypt::ENCRYPT_TAG_LEN],
&nonce,
)
.map_err(|err| {
trc::AuthEvent::Error
.into_err()
.ctx(trc::Key::Details, "Failed to decode token")
.caused_by(trc::location!())
.reason(err)
})?;
// Success
Ok(TokenInfo {
grant_type,
account_id,
client_id,
expiry: expiry + OAUTH_EPOCH,
issued_at: issued_at + OAUTH_EPOCH,
expires_in: expiry - now,
})
}
pub async fn password_hash(&self, account_id: u32) -> trc::Result<String> {
if account_id != u32::MAX {
self.core
.storage
.directory
.query(QueryBy::Id(account_id), false)
.await
.caused_by(trc::location!())?
.ok_or_else(|| {
trc::AuthEvent::Error
.into_err()
.details("Account no longer exists")
})?
.take_str_array(PrincipalField::Secrets)
.unwrap_or_default()
.into_iter()
.next()
.ok_or(
trc::AuthEvent::Error
.into_err()
.details("Account does not contain secrets")
.caused_by(trc::location!()),
)
} else if let Some((_, secret)) = &self.core.jmap.fallback_admin {
Ok(secret.clone())
} else {
Err(trc::AuthEvent::Error
.into_err()
.details("Invalid account ID")
.caused_by(trc::location!()))
}
}
}
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