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use std::{collections::HashMap, ops::Deref};
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use anyhow::Error;
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use futures_util::Future;
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use giterated_models::model::{
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authenticated::{Authenticated, AuthenticationSource, UserTokenMetadata},
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instance::Instance,
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user::User,
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};
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use jsonwebtoken::{decode, Algorithm, DecodingKey, TokenData, Validation};
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use rsa::{
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pkcs1::{DecodeRsaPrivateKey, DecodeRsaPublicKey},
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pss::{Signature, VerifyingKey},
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sha2::Sha256,
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signature::Verifier,
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RsaPublicKey,
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};
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use serde::{de::DeserializeOwned, Serialize};
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use serde_json::Value;
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use crate::connection::wrapper::ConnectionState;
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pub struct NetworkMessage(pub Vec<u8>);
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impl Deref for NetworkMessage {
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type Target = [u8];
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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pub struct AuthenticatedUser(pub User);
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#[derive(Debug, thiserror::Error)]
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pub enum UserAuthenticationError {
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#[error("user authentication missing")]
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Missing,
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#[error("user token was invalid")]
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InvalidToken,
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#[error("an error has occured")]
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Other(#[from] Error),
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}
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pub struct AuthenticatedInstance(Instance);
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impl AuthenticatedInstance {
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pub fn inner(&self) -> &Instance {
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&self.0
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}
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}
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#[async_trait::async_trait]
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pub trait FromMessage<S: Send + Sync>: Sized + Send + Sync {
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async fn from_message(message: &NetworkMessage, state: &S) -> Result<Self, Error>;
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}
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#[async_trait::async_trait]
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impl FromMessage<ConnectionState> for AuthenticatedUser {
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async fn from_message(
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network_message: &NetworkMessage,
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state: &ConnectionState,
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) -> Result<Self, Error> {
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let message: Authenticated<HashMap<String, Value>> =
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serde_json::from_slice(&network_message).map_err(|e| Error::from(e))?;
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let (auth_user, auth_token) = message
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.source
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.iter()
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.filter_map(|auth| {
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if let AuthenticationSource::User { user, token } = auth {
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Some((user, token))
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} else {
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None
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}
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})
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.next()
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.ok_or_else(|| UserAuthenticationError::Missing)?;
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let authenticated_instance =
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AuthenticatedInstance::from_message(network_message, state).await?;
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let public_key_raw = public_key(&auth_user.instance).await?;
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let verification_key = DecodingKey::from_rsa_pem(public_key_raw.as_bytes()).unwrap();
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let data: TokenData<UserTokenMetadata> = decode(
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auth_token.as_ref(),
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&verification_key,
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&Validation::new(Algorithm::RS256),
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)
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.unwrap();
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if data.claims.user != *auth_user
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|| data.claims.generated_for != *authenticated_instance.inner()
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{
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Err(Error::from(UserAuthenticationError::InvalidToken))
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} else {
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Ok(AuthenticatedUser(data.claims.user))
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}
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}
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}
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#[async_trait::async_trait]
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impl FromMessage<ConnectionState> for AuthenticatedInstance {
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async fn from_message(
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network_message: &NetworkMessage,
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state: &ConnectionState,
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) -> Result<Self, Error> {
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let message: Authenticated<HashMap<String, Value>> =
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serde_json::from_slice(&network_message).map_err(|e| Error::from(e))?;
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let (instance, signature) = message
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.source
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.iter()
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.filter_map(|auth: &AuthenticationSource| {
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if let AuthenticationSource::Instance {
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instance,
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signature,
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} = auth
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{
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Some((instance, signature))
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} else {
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None
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}
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})
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.next()
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.ok_or_else(|| UserAuthenticationError::Missing)?;
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let public_key = {
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let cached_keys = state.cached_keys.read().await;
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if let Some(key) = cached_keys.get(&instance) {
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key.clone()
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} else {
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drop(cached_keys);
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let mut cached_keys = state.cached_keys.write().await;
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let key = public_key(instance).await?;
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let public_key = RsaPublicKey::from_pkcs1_pem(&key).unwrap();
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cached_keys.insert(instance.clone(), public_key.clone());
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public_key
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}
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};
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let verifying_key: VerifyingKey<Sha256> = VerifyingKey::new(public_key);
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let message_json = serde_json::to_vec(&message.message).unwrap();
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info!(
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"Verification against: {}",
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std::str::from_utf8(&message_json).unwrap()
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);
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verifying_key.verify(
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&message_json,
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&Signature::try_from(signature.as_ref()).unwrap(),
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)?;
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Ok(AuthenticatedInstance(instance.clone()))
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}
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}
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#[async_trait::async_trait]
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impl<S, T> FromMessage<S> for Option<T>
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where
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T: FromMessage<S>,
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S: Send + Sync + 'static,
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{
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async fn from_message(message: &NetworkMessage, state: &S) -> Result<Self, Error> {
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Ok(T::from_message(message, state).await.ok())
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}
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}
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#[async_trait::async_trait]
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pub trait MessageHandler<T, S, R> {
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async fn handle_message(self, message: &NetworkMessage, state: &S) -> Result<R, Error>;
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}
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#[async_trait::async_trait]
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impl<F, R, S, T1, T, E> MessageHandler<(T1,), S, R> for T
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where
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T: FnOnce(T1) -> F + Clone + Send + 'static,
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F: Future<Output = Result<R, E>> + Send,
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T1: FromMessage<S> + Send,
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S: Send + Sync,
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E: std::error::Error + Send + Sync + 'static,
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{
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async fn handle_message(self, message: &NetworkMessage, state: &S) -> Result<R, Error> {
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let value = T1::from_message(message, state).await?;
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self(value).await.map_err(|e| Error::from(e))
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}
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}
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#[async_trait::async_trait]
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impl<F, R, S, T1, T2, T, E> MessageHandler<(T1, T2), S, R> for T
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where
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T: FnOnce(T1, T2) -> F + Clone + Send + 'static,
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F: Future<Output = Result<R, E>> + Send,
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T1: FromMessage<S> + Send,
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T2: FromMessage<S> + Send,
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S: Send + Sync,
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E: std::error::Error + Send + Sync + 'static,
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{
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async fn handle_message(self, message: &NetworkMessage, state: &S) -> Result<R, Error> {
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let value = T1::from_message(message, state).await?;
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let value_2 = T2::from_message(message, state).await?;
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self(value, value_2).await.map_err(|e| Error::from(e))
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}
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}
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#[async_trait::async_trait]
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impl<F, R, S, T1, T2, T3, T, E> MessageHandler<(T1, T2, T3), S, R> for T
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where
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T: FnOnce(T1, T2, T3) -> F + Clone + Send + 'static,
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F: Future<Output = Result<R, E>> + Send,
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T1: FromMessage<S> + Send,
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T2: FromMessage<S> + Send,
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T3: FromMessage<S> + Send,
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S: Send + Sync,
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E: std::error::Error + Send + Sync + 'static,
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{
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async fn handle_message(self, message: &NetworkMessage, state: &S) -> Result<R, Error> {
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let value = T1::from_message(message, state).await?;
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let value_2 = T2::from_message(message, state).await?;
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let value_3 = T3::from_message(message, state).await?;
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self(value, value_2, value_3)
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.await
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.map_err(|e| Error::from(e))
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}
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}
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pub struct State<T>(pub T);
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#[async_trait::async_trait]
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impl<T> FromMessage<T> for State<T>
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where
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T: Clone + Send + Sync,
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{
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async fn from_message(_: &NetworkMessage, state: &T) -> Result<Self, Error> {
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Ok(Self(state.clone()))
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}
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}
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#[async_trait::async_trait]
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impl<T, S> FromMessage<S> for Message<T>
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where
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T: DeserializeOwned + Send + Sync + Serialize,
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S: Clone + Send + Sync,
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{
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async fn from_message(message: &NetworkMessage, _: &S) -> Result<Self, Error> {
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Ok(Message(serde_json::from_slice(&message)?))
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}
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}
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pub struct Message<T: Serialize + DeserializeOwned>(pub T);
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async fn public_key(instance: &Instance) -> Result<String, Error> {
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let key = reqwest::get(format!("https://{}/.giterated/pubkey.pem", instance.url))
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.await?
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.text()
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.await?;
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Ok(key)
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}
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|