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