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feat: verify inbox http signatures

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əlemi 2024-04-13 01:49:23 +02:00
parent d66f09d130
commit 46bbeea3ab
Signed by: alemi
GPG key ID: A4895B84D311642C
1 changed files with 63 additions and 38 deletions
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101
src/server/auth.rs
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@ -1,10 +1,13 @@
use std::collections::BTreeMap; use std::collections::BTreeMap;
use axum::{extract::{FromRef, FromRequestParts}, http::{header, request::Parts, StatusCode}}; use axum::{extract::{FromRef, FromRequestParts}, http::{header, request::Parts, HeaderMap, StatusCode}};
use openssl::hash::MessageDigest; use base64::Engine;
use http_signature_normalization::Config;
use openssl::{hash::MessageDigest, pkey::PKey, sign::Verifier};
use reqwest::Method;
use sea_orm::{ColumnTrait, Condition, EntityTrait, QueryFilter}; use sea_orm::{ColumnTrait, Condition, EntityTrait, QueryFilter};
use crate::{model, server::Context}; use crate::{errors::UpubError, model, server::Context};
#[derive(Debug, Clone)] #[derive(Debug, Clone)]
pub enum Identity { pub enum Identity {
@ -33,7 +36,7 @@ where
Context: FromRef<S>, Context: FromRef<S>,
S: Send + Sync, S: Send + Sync,
{ {
type Rejection = StatusCode; type Rejection = UpubError;
async fn from_request_parts(parts: &mut Parts, state: &S) -> Result<Self, Self::Rejection> { async fn from_request_parts(parts: &mut Parts, state: &S) -> Result<Self, Self::Rejection> {
let ctx = Context::from_ref(state); let ctx = Context::from_ref(state);
@ -52,47 +55,65 @@ where
.await .await
{ {
Ok(Some(x)) => identity = Identity::Local(x.actor), Ok(Some(x)) => identity = Identity::Local(x.actor),
Ok(None) => return Err(StatusCode::UNAUTHORIZED), Ok(None) => return Err(UpubError::unauthorized()),
Err(e) => { Err(e) => {
tracing::error!("failed querying user session: {e}"); tracing::error!("failed querying user session: {e}");
return Err(StatusCode::INTERNAL_SERVER_ERROR) return Err(UpubError::internal_server_error())
}, },
} }
} }
// if let Some(sig) = parts if let Some(sig) = parts
// .headers .headers
// .get("Signature") .get("Signature")
// .map(|v| v.to_str().unwrap_or("")) .map(|v| v.to_str().unwrap_or(""))
// { {
// let signature = HttpSignature::try_from(sig)?; let mut signature_cfg = Config::new()
// let user_id = signature.key_id.split('#').next().unwrap_or("").to_string(); .dont_use_created_field()
// let data : String = signature.headers.iter() .require_header("host")
// .map(|header| { .require_header("date");
// if header == "(request-target)" { let mut headers : BTreeMap<String, String> = [
// format!("(request-target): {} {}", parts.method, parts.uri) ("Signature".to_string(), sig.to_string()),
// } else { ("Host".to_string(), header_get(&parts.headers, "Host")),
// format!( ("Date".to_string(), header_get(&parts.headers, "Date")),
// "{header}: {}", ].into();
// parts.headers.get(header)
// .map(|h| h.to_str().unwrap_or(""))
// .unwrap_or("")
// )
// }
// })
// .collect::<Vec<String>>() // TODO can we avoid this unneeded allocation?
// .join("\n");
// let user = ctx.fetch().user(&user_id).await.map_err(|_e| StatusCode::UNAUTHORIZED)?; if parts.method == Method::POST {
// let pubkey = PKey::public_key_from_pem(user.public_key.as_bytes()).map_err(|_e| StatusCode::INTERNAL_SERVER_ERROR)?; signature_cfg = signature_cfg.require_header("digest");
// let mut verifier = Verifier::new(signature.digest(), &pubkey).map_err(|_e| StatusCode::INTERNAL_SERVER_ERROR)?; headers.insert("Digest".to_string(), header_get(&parts.headers, "Digest"));
// verifier.update(data.as_bytes()).map_err(|_e| StatusCode::INTERNAL_SERVER_ERROR)?; }
// if verifier.verify(signature.signature.as_bytes()).map_err(|_e| StatusCode::INTERNAL_SERVER_ERROR)? {
// identity = Identity::Remote(user_id); let unverified = match signature_cfg.begin_verify(
// } else { parts.method.as_str(),
// return Err(StatusCode::FORBIDDEN); parts.uri.path_and_query().map(|x| x.as_str()).unwrap_or("/"),
// } headers
// } ) {
Ok(x) => x,
Err(e) => {
tracing::error!("failed preparing signature verification context: {e}");
return Err(UpubError::internal_server_error());
}
};
let user_id = unverified.key_id().replace("#main-key", "");
let user = ctx.fetch().user(&user_id).await?;
let pubkey = PKey::public_key_from_pem(user.public_key.as_bytes())?;
let valid = unverified.verify(|sig, to_sign| {
let mut verifier = Verifier::new(MessageDigest::sha256(), &pubkey).unwrap();
verifier.update(to_sign.as_bytes())?;
Ok(verifier.verify(&base64::prelude::BASE64_URL_SAFE.decode(sig).unwrap_or_default())?) as crate::Result<bool>
})?;
if !valid {
return Err(UpubError::unauthorized());
}
// TODO assert payload's digest is equal to signature's
// TODO introduce hardened mode which identifies remotes by user and not server
identity = Identity::Remote(Context::server(&user_id));
}
Ok(AuthIdentity(identity)) Ok(AuthIdentity(identity))
} }
@ -146,3 +167,7 @@ impl TryFrom<&str> for HttpSignature {
} }
} }
pub fn header_get(headers: &HeaderMap, k: &str) -> String {
headers.get(k).map(|x| x.to_str().unwrap_or("")).unwrap_or("").to_string()
}