spiffe_rustls/
server.rs

1use crate::error::Result;
2use crate::resolve::MaterialWatcher;
3use crate::types::{authorize_any, AuthorizeSpiffeId};
4use crate::verifier::SpiffeClientCertVerifier;
5use rustls::server::ResolvesServerCert;
6use rustls::ServerConfig;
7use spiffe::{TrustDomain, X509Source};
8use std::sync::Arc;
9
10/// Options for building a SPIFFE-aware `rustls::ServerConfig`.
11#[derive(Clone)]
12pub struct ServerConfigOptions {
13    /// Trust domain whose bundle is used as the verification root set.
14    pub trust_domain: TrustDomain,
15
16    /// Authorization hook invoked with the client SPIFFE ID.
17    ///
18    /// Returning `false` rejects the peer even if the certificate chain is valid.
19    pub authorize_client: AuthorizeSpiffeId,
20}
21
22impl ServerConfigOptions {
23    /// Creates options that accept any client SPIFFE ID for the given trust domain.
24    ///
25    /// Authentication still happens via bundle verification; only authorization is permissive.
26    pub fn allow_any(trust_domain: TrustDomain) -> Self {
27        Self {
28            trust_domain,
29            authorize_client: authorize_any(),
30        }
31    }
32}
33
34/// Builds a `rustls::ServerConfig` backed by an [`spiffe::X509Source`].
35///
36/// The resulting config:
37/// - presents the current SVID as the server certificate
38/// - requires and verifies client certificates (mTLS) using the trust domain bundle
39/// - authorizes the client by SPIFFE ID (URI SAN)
40///
41/// New handshakes use the latest SVID/bundle material after rotations.
42pub struct ServerConfigBuilder {
43    source: Arc<X509Source>,
44    opts: ServerConfigOptions,
45}
46
47impl ServerConfigBuilder {
48    /// Creates a new builder from an `X509Source` and options.
49    pub fn new(source: Arc<X509Source>, opts: ServerConfigOptions) -> Self {
50        Self { source, opts }
51    }
52
53    /// Builds the `rustls::ServerConfig`.
54    pub async fn build(self) -> Result<ServerConfig> {
55        crate::crypto::ensure_crypto_provider_installed();
56
57        let watcher = MaterialWatcher::new(self.source, self.opts.trust_domain).await?;
58
59        let resolver: Arc<dyn ResolvesServerCert> =
60            Arc::new(resolve_server::SpiffeServerCertResolver {
61                watcher: watcher.clone(),
62            });
63
64        let verifier = Arc::new(SpiffeClientCertVerifier::new(
65            Arc::new(watcher.clone()),
66            self.opts.authorize_client,
67        )?);
68
69        let cfg = ServerConfig::builder()
70            .with_client_cert_verifier(verifier)
71            .with_cert_resolver(resolver);
72
73        Ok(cfg)
74    }
75}
76
77mod resolve_server {
78    use crate::resolve::MaterialWatcher;
79    use rustls::server::ResolvesServerCert;
80    use rustls::sign::CertifiedKey;
81    use std::sync::Arc;
82
83    #[derive(Clone, Debug)]
84    pub(crate) struct SpiffeServerCertResolver {
85        pub watcher: MaterialWatcher,
86    }
87
88    impl ResolvesServerCert for SpiffeServerCertResolver {
89        fn resolve(
90            &self,
91            _client_hello: rustls::server::ClientHello<'_>,
92        ) -> Option<Arc<CertifiedKey>> {
93            Some(self.watcher.current().certified_key.clone())
94        }
95    }
96}
spiffe_rustls/server.rs

spiffe_rustls/
server.rs
