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104 lines
3.2 KiB
Rust
104 lines
3.2 KiB
Rust
use crate::APUB_JSON_CONTENT_TYPE;
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use actix_web::HttpRequest;
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use anyhow::anyhow;
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use http::{header::HeaderName, HeaderMap, HeaderValue};
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use http_signature_normalization_actix::Config as ConfigActix;
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use http_signature_normalization_reqwest::prelude::{Config, SignExt};
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use lemmy_utils::LemmyError;
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use once_cell::sync::Lazy;
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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 reqwest::Response;
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use reqwest_middleware::ClientWithMiddleware;
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use serde::{Deserialize, Serialize};
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use sha2::{Digest, Sha256};
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use std::str::FromStr;
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use tracing::debug;
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use url::Url;
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static CONFIG2: Lazy<ConfigActix> = Lazy::new(ConfigActix::new);
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static HTTP_SIG_CONFIG: Lazy<Config> = Lazy::new(Config::new);
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/// Creates an HTTP post request to `inbox_url`, with the given `client` and `headers`, and
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/// `activity` as request body. The request is signed with `private_key` and then sent.
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pub async fn sign_and_send(
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client: &ClientWithMiddleware,
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inbox_url: &Url,
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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<Response, LemmyError> {
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let signing_key_id = format!("{}#main-key", actor_id);
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let mut headers = HeaderMap::new();
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let mut host = inbox_url.domain().expect("read inbox domain").to_string();
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if let Some(port) = inbox_url.port() {
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host = format!("{}:{}", host, port);
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}
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headers.insert(
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HeaderName::from_str("Content-Type")?,
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HeaderValue::from_str(APUB_JSON_CONTENT_TYPE)?,
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);
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headers.insert(HeaderName::from_str("Host")?, HeaderValue::from_str(&host)?);
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let request = client
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.post(&inbox_url.to_string())
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.headers(headers)
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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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let response = client.execute(request).await?;
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Ok(response)
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}
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/// Verifies the HTTP signature on an incoming inbox request.
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pub fn verify_signature(request: &HttpRequest, public_key: &str) -> Result<(), LemmyError> {
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let verified = CONFIG2
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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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#[derive(Clone, Debug, Deserialize, Serialize)]
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#[serde(rename_all = "camelCase")]
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pub struct PublicKey {
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pub(crate) id: String,
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pub(crate) owner: Box<Url>,
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pub public_key_pem: String,
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}
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