Hexbear is the engine that powers Chapochat. It is a customization of the Lemmy project.
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use crate::apub::ActorType;
use activitystreams::unparsed::UnparsedMutExt;
use activitystreams_ext::UnparsedExtension;
use actix_web::HttpRequest;
use awc::ClientRequest;
use anyhow::{anyhow, Context};
use http_signature_normalization_actix::{
digest::{DigestClient, SignExt},
Config,
};
use lemmy_utils::{location_info, LemmyError};
use log::debug;
use openssl::{
hash::MessageDigest,
pkey::PKey,
sign::{Signer, Verifier},
};
use serde::{Deserialize, Serialize};
use sha2::{Digest, Sha256};
use url::Url;
lazy_static! {
static ref HTTP_SIG_CONFIG: Config = Config::new();
}
/// Signs request headers with the given keypair.
pub async fn sign(
request: ClientRequest,
activity: String,
actor_id: &Url,
private_key: String,
) -> Result<DigestClient<String>, LemmyError> {
let signing_key_id = format!("{}#main-key", actor_id);
let digest_client = request
.signature_with_digest(
HTTP_SIG_CONFIG.clone(),
signing_key_id,
Sha256::new(),
activity,
move |signing_string| {
let private_key = PKey::private_key_from_pem(private_key.as_bytes())?;
let mut signer = Signer::new(MessageDigest::sha256(), &private_key)?;
signer.update(signing_string.as_bytes())?;
Ok(base64::encode(signer.sign_to_vec()?)) as Result<_, LemmyError>
},
)
.await?;
Ok(digest_client)
}
pub fn verify(request: &HttpRequest, actor: &dyn ActorType) -> Result<(), LemmyError> {
let public_key = actor.public_key().context(location_info!())?;
let verified = HTTP_SIG_CONFIG
.begin_verify(
request.method(),
request.uri().path_and_query(),
request.headers().clone(),
)?
.verify(|signature, signing_string| -> Result<bool, LemmyError> {
debug!(
"Verifying with key {}, message {}",
&public_key, &signing_string
);
let public_key = PKey::public_key_from_pem(public_key.as_bytes())?;
let mut verifier = Verifier::new(MessageDigest::sha256(), &public_key)?;
verifier.update(&signing_string.as_bytes())?;
Ok(verifier.verify(&base64::decode(signature)?)?)
})?;
if verified {
debug!("verified signature for {}", &request.uri());
Ok(())
} else {
Err(anyhow!("Invalid signature on request: {}", &request.uri()).into())
}
}
// The following is taken from here:
// https://docs.rs/activitystreams/0.5.0-alpha.17/activitystreams/ext/index.html
#[derive(Clone, Debug, Default, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct PublicKey {
pub id: String,
pub owner: String,
pub public_key_pem: String,
}
#[derive(Clone, Debug, Default, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct PublicKeyExtension {
pub public_key: PublicKey,
}
impl PublicKey {
pub fn to_ext(&self) -> PublicKeyExtension {
PublicKeyExtension {
public_key: self.to_owned(),
}
}
}
impl<U> UnparsedExtension<U> for PublicKeyExtension
where
U: UnparsedMutExt,
{
type Error = serde_json::Error;
fn try_from_unparsed(unparsed_mut: &mut U) -> Result<Self, Self::Error> {
Ok(PublicKeyExtension {
public_key: unparsed_mut.remove("publicKey")?,
})
}
fn try_into_unparsed(self, unparsed_mut: &mut U) -> Result<(), Self::Error> {
unparsed_mut.insert("publicKey", self.public_key)?;
Ok(())
}
}