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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 utils::codec::leb128::{Leb128Iterator, Leb128Vec};
use crate::Server;
use super::{crypto::SymmetricEncrypt, CLIENT_ID_MAX_LEN, RANDOM_CODE_LEN};
impl Server {
pub async fn issue_custom_token(
&self,
account_id: u32,
grant_type: &str,
client_id: &str,
expiry_in: u64,
) -> trc::Result<String> {
self.encode_access_token(
grant_type,
account_id,
&self
.password_hash(account_id)
.await
.map_err(|err| trc::StoreEvent::UnexpectedError.into_err().details(err))?,
client_id,
expiry_in,
)
.map_err(|err| trc::StoreEvent::UnexpectedError.into_err().details(err))
}
pub fn encode_access_token(
&self,
grant_type: &str,
account_id: u32,
password_hash: &str,
client_id: &str,
expiry_in: u64,
) -> Result<String, &'static str> {
// Build context
if client_id.len() > CLIENT_ID_MAX_LEN {
return Err("ClientId is too long");
}
let key = self.core.jmap.oauth_key.clone();
let context = format!(
"{} {} {} {}",
grant_type, client_id, account_id, password_hash
);
let context_nonce = format!("{} nonce {}", grant_type, password_hash);
// Set expiration time
let expiry = SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)
.map(|d| d.as_secs())
.unwrap_or(0)
.saturating_sub(946684800) // Jan 1, 2000
+ expiry_in;
// Calculate nonce
let mut hasher = blake3::Hasher::new();
hasher.update(context_nonce.as_bytes());
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(|_| "Failed to encrypt token.")?;
token.push_leb128(account_id);
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,
grant_type: &str,
token_: &str,
) -> trc::Result<(u32, String, u64)> {
// 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, expiry, client_id) = token
.get((RANDOM_CODE_LEN + SymmetricEncrypt::ENCRYPT_TAG_LEN)..)
.and_then(|bytes| {
let mut bytes = bytes.iter();
(
bytes.next_leb128()?,
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(|d| d.as_secs())
.unwrap_or(0)
.saturating_sub(946684800); // Jan 1, 2000
if expiry <= now {
return Err(trc::AuthEvent::TokenExpired.into_err());
}
// Obtain password hash
let password_hash = self
.password_hash(account_id)
.await
.map_err(|err| trc::AuthEvent::Error.into_err().ctx(trc::Key::Details, err))?;
// Build context
let key = self.core.jmap.oauth_key.clone();
let context = format!(
"{} {} {} {}",
grant_type, client_id, account_id, password_hash
);
let context_nonce = format!("{} nonce {}", grant_type, password_hash);
// Calculate nonce
let mut hasher = blake3::Hasher::new();
hasher.update(context_nonce.as_bytes());
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((account_id, client_id, expiry - now))
}
pub async fn password_hash(&self, account_id: u32) -> Result<String, &'static str> {
if account_id != u32::MAX {
self.core
.storage
.directory
.query(QueryBy::Id(account_id), false)
.await
.map_err(|_| "Temporary lookup error")?
.ok_or("Account no longer exists")?
.take_str_array(PrincipalField::Secrets)
.unwrap_or_default()
.into_iter()
.next()
.ok_or("Failed to obtain password hash")
} else if let Some((_, secret)) = &self.core.jmap.fallback_admin {
Ok(secret.clone())
} else {
Err("Invalid account id.")
}
}
}
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