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/*
* SPDX-FileCopyrightText: 2020 Stalwart Labs Ltd <hello@stalw.art>
*
* SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
*/
use std::str::FromStr;
use common::config::smtp::auth::simple_pem_parse;
use directory::{backend::internal::manage, Permission};
use hyper::Method;
use mail_auth::{
common::crypto::{Ed25519Key, RsaKey, Sha256},
dkim::generate::DkimKeyPair,
};
use mail_builder::encoders::base64::base64_encode;
use mail_parser::DateTime;
use pkcs8::Document;
use rsa::pkcs1::DecodeRsaPublicKey;
use serde::{Deserialize, Serialize};
use serde_json::json;
use store::write::now;
use crate::{
api::{http::ToHttpResponse, HttpRequest, HttpResponse, JsonResponse},
auth::AccessToken,
JMAP,
};
use super::decode_path_element;
#[derive(Debug, Serialize, Deserialize, Copy, Clone, PartialEq, Eq)]
pub enum Algorithm {
Rsa,
Ed25519,
}
#[derive(Debug, Serialize, Deserialize)]
struct DkimSignature {
id: Option<String>,
algorithm: Algorithm,
domain: String,
selector: Option<String>,
}
impl JMAP {
pub async fn handle_manage_dkim(
&self,
req: &HttpRequest,
path: Vec<&str>,
body: Option<Vec<u8>>,
access_token: &AccessToken,
) -> trc::Result<HttpResponse> {
match *req.method() {
Method::GET => {
// Validate the access token
access_token.assert_has_permission(Permission::DkimSignatureGet)?;
self.handle_get_public_key(path).await
}
Method::POST => {
// Validate the access token
access_token.assert_has_permission(Permission::DkimSignatureCreate)?;
self.handle_create_signature(body).await
}
_ => Err(trc::ResourceEvent::NotFound.into_err()),
}
}
async fn handle_get_public_key(&self, path: Vec<&str>) -> trc::Result<HttpResponse> {
let signature_id = match path.get(1) {
Some(signature_id) => decode_path_element(signature_id),
None => {
return Err(trc::ResourceEvent::NotFound.into_err());
}
};
let (pk, algo) = match (
self.core
.storage
.config
.get(&format!("signature.{signature_id}.private-key"))
.await,
self.core
.storage
.config
.get(&format!("signature.{signature_id}.algorithm"))
.await
.map(|algo| algo.and_then(|algo| algo.parse::<Algorithm>().ok())),
) {
(Ok(Some(pk)), Ok(Some(algorithm))) => (pk, algorithm),
(Err(err), _) | (_, Err(err)) => return Err(err.caused_by(trc::location!())),
_ => return Err(trc::ResourceEvent::NotFound.into_err()),
};
Ok(JsonResponse::new(json!({
"data": obtain_dkim_public_key(algo, &pk)?,
}))
.into_http_response())
}
async fn handle_create_signature(&self, body: Option<Vec<u8>>) -> trc::Result<HttpResponse> {
let request =
match serde_json::from_slice::<DkimSignature>(body.as_deref().unwrap_or_default()) {
Ok(request) => request,
Err(err) => {
return Err(
trc::EventType::Resource(trc::ResourceEvent::BadParameters).reason(err)
)
}
};
let algo_str = match request.algorithm {
Algorithm::Rsa => "rsa",
Algorithm::Ed25519 => "ed25519",
};
let id = request
.id
.unwrap_or_else(|| format!("{algo_str}-{}", request.domain));
let selector = request.selector.unwrap_or_else(|| {
let dt = DateTime::from_timestamp(now() as i64);
format!(
"{:04}{:02}{}",
dt.year,
dt.month,
if Algorithm::Rsa == request.algorithm {
"r"
} else {
"e"
}
)
});
// Make sure the signature does not exist already
if let Some(value) = self
.core
.storage
.config
.get(&format!("signature.{id}.private-key"))
.await?
{
return Err(manage::err_exists(
format!("signature.{id}.private-key"),
value,
));
}
// Create signature
self.create_dkim_key(request.algorithm, id, request.domain, selector)
.await?;
Ok(JsonResponse::new(json!({
"data": (),
}))
.into_http_response())
}
async fn create_dkim_key(
&self,
algo: Algorithm,
id: impl AsRef<str>,
domain: impl Into<String>,
selector: impl Into<String>,
) -> trc::Result<()> {
let id = id.as_ref();
let (algorithm, pk_type) = match algo {
Algorithm::Rsa => ("rsa-sha256", "RSA PRIVATE KEY"),
Algorithm::Ed25519 => ("ed25519-sha256", "PRIVATE KEY"),
};
let mut pk = format!("-----BEGIN {pk_type}-----\n").into_bytes();
let mut lf_count = 65;
for ch in base64_encode(
match algo {
Algorithm::Rsa => DkimKeyPair::generate_rsa(2048),
Algorithm::Ed25519 => DkimKeyPair::generate_ed25519(),
}
.map_err(|err| {
manage::error("Failed to generate key", err.to_string().into())
.caused_by(trc::location!())
})?
.private_key(),
)
.unwrap_or_default()
{
pk.push(ch);
lf_count -= 1;
if lf_count == 0 {
pk.push(b'\n');
lf_count = 65;
}
}
if lf_count != 65 {
pk.push(b'\n');
}
pk.extend_from_slice(format!("-----END {pk_type}-----\n").as_bytes());
self.core
.storage
.config
.set([
(
format!("signature.{id}.private-key"),
String::from_utf8(pk).unwrap(),
),
(format!("signature.{id}.domain"), domain.into()),
(format!("signature.{id}.selector"), selector.into()),
(format!("signature.{id}.algorithm"), algorithm.to_string()),
(
format!("signature.{id}.canonicalization"),
"relaxed/relaxed".to_string(),
),
(format!("signature.{id}.headers.0"), "From".to_string()),
(format!("signature.{id}.headers.1"), "To".to_string()),
(format!("signature.{id}.headers.2"), "Date".to_string()),
(format!("signature.{id}.headers.3"), "Subject".to_string()),
(
format!("signature.{id}.headers.4"),
"Message-ID".to_string(),
),
(format!("signature.{id}.report"), "false".to_string()),
])
.await
}
}
pub fn obtain_dkim_public_key(algo: Algorithm, pk: &str) -> trc::Result<String> {
match simple_pem_parse(pk) {
Some(der) => match algo {
Algorithm::Rsa => match RsaKey::<Sha256>::from_der(&der).and_then(|key| {
Document::from_pkcs1_der(&key.public_key())
.map_err(|err| mail_auth::Error::CryptoError(err.to_string()))
}) {
Ok(pk) => Ok(
String::from_utf8(base64_encode(pk.as_bytes()).unwrap_or_default())
.unwrap_or_default(),
),
Err(err) => Err(manage::error(
"Failed to read RSA DER",
err.to_string().into(),
)),
},
Algorithm::Ed25519 => {
match Ed25519Key::from_pkcs8_maybe_unchecked_der(&der)
.map_err(|err| mail_auth::Error::CryptoError(err.to_string()))
{
Ok(pk) => Ok(String::from_utf8(
base64_encode(&pk.public_key()).unwrap_or_default(),
)
.unwrap_or_default()),
Err(err) => Err(manage::error("Crypto error", err.to_string().into())),
}
}
},
None => Err(manage::error("Failed to decode private key", None::<u32>)),
}
}
impl FromStr for Algorithm {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s.split_once('-').map(|(algo, _)| algo) {
Some("rsa") => Ok(Algorithm::Rsa),
Some("ed25519") => Ok(Algorithm::Ed25519),
_ => Err(()),
}
}
}
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