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feat(gateway): mTLS client-certificate listener (Phase 1) #2

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feat(gateway): mTLS client-certificate listener (Phase 1) #2

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105 changes: 105 additions & 0 deletions apps/gateway/Cargo.lock
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3 changes: 3 additions & 0 deletions apps/gateway/Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,9 @@ tokio-rustls = "0.26"
rustls = { version = "0.23", features = ["ring"] }
rustls-pemfile = "2"

# X.509 parsing (mTLS client-certificate identity extraction — CN/URI SANs)
x509-parser = "0.16"

# WebSocket upstream TLS root certificates
webpki-roots = "0.26"

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16 changes: 13 additions & 3 deletions apps/gateway/src/ca.rs
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Expand Up @@ -125,6 +125,14 @@ impl CertificateAuthority {
der_to_pem(self.ca_cert_der.as_ref())
}

/// Return the raw CA certificate DER.
/// Used by `client_ca::MtlsConfig::from_env` to reject a `GATEWAY_CLIENT_CA`
/// that is (accidentally or maliciously) this same CA — see the SECURITY
/// note in `client_ca.rs`.
pub(crate) fn ca_cert_der(&self) -> &CertificateDer<'static> {
&self.ca_cert_der
}

/// Load CA from PEM strings (key + certificate).
/// Used when CA is provided via environment variables (cloud mode).
fn load_from_pem(key_pem: &str, cert_pem: &str) -> Result<Self> {
Expand Down Expand Up @@ -333,9 +341,11 @@ mod tests {

fn ensure_crypto_provider() {
INIT_CRYPTO.call_once(|| {
rustls::crypto::ring::default_provider()
.install_default()
.expect("install CryptoProvider");
// Ignore the error: it just means another test module (e.g.
// `client_ca`) already installed the process-wide default in this
// same test binary — a no-op for our purposes either way, since
// it's the same `ring` provider.
let _ = rustls::crypto::ring::default_provider().install_default();
});
}

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