certificate chain verification test

Cargo.lock

@@ -7765,6 +7765,13 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "x509test"
+version = "0.1.0"
+dependencies = [
+ "rustls",
+]
+
 [[package]]
 name = "xshell"
 version = "0.2.2"

labs/x509test/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "x509test"
+version = "0.1.0"
+edition = "2024"
+rust-version.workspace = true
+
+[dependencies]
+rustls = "^0.23.4"
+
+[lints]
+workspace = true

labs/x509test/src/cacert.pem

@@ -0,0 +1,31 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

labs/x509test/src/cert.pem

@@ -0,0 +1,25 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

labs/x509test/src/key.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----

labs/x509test/src/main.rs

@@ -0,0 +1,42 @@
+use std::sync::Arc;
+
+use rustls::{
+    RootCertStore,
+    pki_types::{CertificateDer, UnixTime, pem::PemObject},
+    server::WebPkiClientVerifier,
+};
+
+// TODO: how to load from a PKCS12 bundle? cms::encrypted_data, I think
+const KEY_BUNDLE: &[u8] = include_bytes!("bundle.p12");
+
+const CA_CERT: &[u8] = include_bytes!("cacert.pem");
+const CERT_BUNDLE_PEM: &[u8] = include_bytes!("cert.pem");
+const PRIVATE_KEY_PEM: &[u8] = include_bytes!("key.pem");
+
+fn main() {
+    // Load the trusted root certificates into a verifier. These would come from
+    // local configuration.
+    let mut root_store = RootCertStore::empty();
+    for result in CertificateDer::pem_slice_iter(CA_CERT) {
+        root_store
+            .add(result.expect("Unable to parse certificate in root store"))
+            .expect("Unable to add certificate to root store");
+    }
+    let verifier = WebPkiClientVerifier::builder(Arc::new(root_store))
+        //.with_crls(...)
+        .build()
+        .unwrap();
+
+    // Verify the certificate chain presented by the device
+    let mut cert_iter = CertificateDer::pem_slice_iter(CERT_BUNDLE_PEM)
+        .map(|r| r.expect("Unable to parse cert in cert chain"));
+    let end_cert = cert_iter.next().expect("Empty certificate chain");
+    let intermediate_certs: Vec<_> = cert_iter.collect();
+
+    verifier
+        .verify_client_cert(&end_cert, intermediate_certs.as_ref(), UnixTime::now())
+        .expect("Unable to verify client certificate");
+
+    // TODO: verify that the end cert is valid for the user id in question
+    // TODO: verify a signature from the end cert
+}