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/// Configuration options for [`ServerConfigBuilder`].
11///
12/// These options control trust bundle selection and client authorization.
13#[derive(Clone)]
14pub struct ServerConfigOptions {
15    /// Trust domain whose bundle is used as the verification root set.
16    pub trust_domain: TrustDomain,
17
18    /// Authorization hook invoked with the client SPIFFE ID.
19    ///
20    /// The hook receives the SPIFFE ID extracted from the client certificate’s
21    /// URI SAN and must return `true` to allow the connection.
22    pub authorize_client: AuthorizeSpiffeId,
23}
24
25impl ServerConfigOptions {
26    /// Creates options that authenticate clients but allow any SPIFFE ID.
27    ///
28    /// This disables authorization while retaining full TLS authentication.
29    /// Use only if authorization is performed at another layer.
30    pub fn allow_any(trust_domain: TrustDomain) -> Self {
31        Self {
32            trust_domain,
33            authorize_client: authorize_any(),
34        }
35    }
36}
37
38/// Builds a [`rustls::ServerConfig`] backed by a live SPIFFE `X509Source`.
39///
40/// The resulting server configuration:
41///
42/// * presents the current SPIFFE X.509 SVID as the server certificate
43/// * requires and validates client certificates (mTLS)
44/// * authorizes the client by SPIFFE ID (URI SAN)
45///
46/// The builder retains an `Arc<X509Source>`. When the underlying SVID or trust
47/// bundle is rotated by the SPIRE agent, **new TLS handshakes automatically use
48/// the updated material**.
49///
50/// ## Authorization
51///
52/// Client authorization is performed by invoking the provided
53/// [`AuthorizeSpiffeId`] hook with the client’s SPIFFE ID extracted from the
54/// certificate’s URI SAN.
55///
56/// Use [`ServerConfigOptions::allow_any`] to disable authorization while
57/// retaining full TLS authentication.
58pub struct ServerConfigBuilder {
59    source: Arc<X509Source>,
60    opts: ServerConfigOptions,
61}
62
63impl ServerConfigBuilder {
64    /// Creates a new builder from an `X509Source` and options.
65    pub fn new(source: Arc<X509Source>, opts: ServerConfigOptions) -> Self {
66        Self { source, opts }
67    }
68
69    /// Builds the `rustls::ServerConfig`.
70    pub async fn build(self) -> Result<ServerConfig> {
71        crate::crypto::ensure_crypto_provider_installed();
72
73        let watcher = MaterialWatcher::new(self.source, self.opts.trust_domain).await?;
74
75        let resolver: Arc<dyn ResolvesServerCert> =
76            Arc::new(resolve_server::SpiffeServerCertResolver {
77                watcher: watcher.clone(),
78            });
79
80        let verifier = Arc::new(SpiffeClientCertVerifier::new(
81            Arc::new(watcher.clone()),
82            self.opts.authorize_client,
83        )?);
84
85        let cfg = ServerConfig::builder()
86            .with_client_cert_verifier(verifier)
87            .with_cert_resolver(resolver);
88
89        Ok(cfg)
90    }
91}
92
93mod resolve_server {
94    use crate::resolve::MaterialWatcher;
95    use rustls::server::ResolvesServerCert;
96    use rustls::sign::CertifiedKey;
97    use std::sync::Arc;
98
99    #[derive(Clone, Debug)]
100    pub(crate) struct SpiffeServerCertResolver {
101        pub watcher: MaterialWatcher,
102    }
103
104    impl ResolvesServerCert for SpiffeServerCertResolver {
105        fn resolve(
106            &self,
107            _client_hello: rustls::server::ClientHello<'_>,
108        ) -> Option<Arc<CertifiedKey>> {
109            Some(self.watcher.current().certified_key.clone())
110        }
111    }
112}
spiffe_rustls/server.rs

spiffe_rustls/
server.rs
