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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.security.tls;
import com.yahoo.security.SubjectAlternativeName;
import com.yahoo.security.X509CertificateUtils;
import java.security.cert.X509Certificate;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.logging.Logger;
import static com.yahoo.security.SubjectAlternativeName.Type.DNS;
import static com.yahoo.security.SubjectAlternativeName.Type.IP;
import static com.yahoo.security.SubjectAlternativeName.Type.URI;
/**
* Uses rules from {@link AuthorizedPeers} to evaluate X509 certificates
*
* @author bjorncs
*/
public class PeerAuthorizer {
private static final Logger log = Logger.getLogger(PeerAuthorizer.class.getName());
private final AuthorizedPeers authorizedPeers;
public PeerAuthorizer(AuthorizedPeers authorizedPeers) {
this.authorizedPeers = authorizedPeers;
}
public ConnectionAuthContext authorizePeer(X509Certificate cert) { return authorizePeer(List.of(cert)); }
public ConnectionAuthContext authorizePeer(List<X509Certificate> certChain) {
if (authorizedPeers.isEmpty()) return ConnectionAuthContext.defaultAllCapabilities(certChain);
X509Certificate cert = certChain.get(0);
Set<String> matchedPolicies = new HashSet<>();
Set<CapabilitySet> grantedCapabilities = new HashSet<>();
String cn = X509CertificateUtils.getSubjectCommonName(cert).orElse(null);
List<String> sans = getSubjectAlternativeNames(cert);
log.fine(() -> String.format("Subject info from x509 certificate: CN=[%s], 'SAN=%s", cn, sans));
for (PeerPolicy peerPolicy : authorizedPeers.peerPolicies()) {
if (matchesPolicy(peerPolicy, cn, sans)) {
matchedPolicies.add(peerPolicy.policyName());
grantedCapabilities.add(peerPolicy.capabilities());
}
}
// TODO Pass this through constructor
CapabilityMode capabilityMode = TransportSecurityUtils.getCapabilityMode();
return new ConnectionAuthContext(
certChain, CapabilitySet.ofSets(grantedCapabilities), matchedPolicies, capabilityMode);
}
private static boolean matchesPolicy(PeerPolicy peerPolicy, String cn, List<String> sans) {
return peerPolicy.requiredCredentials().stream()
.allMatch(requiredCredential -> matchesRequiredCredentials(requiredCredential, cn, sans));
}
private static boolean matchesRequiredCredentials(RequiredPeerCredential requiredCredential, String cn, List<String> sans) {
return switch (requiredCredential.field()) {
case CN -> cn != null && requiredCredential.pattern().matches(cn);
case SAN_DNS, SAN_URI -> sans.stream().anyMatch(san -> requiredCredential.pattern().matches(san));
};
}
private static List<String> getSubjectAlternativeNames(X509Certificate peerCertificate) {
return X509CertificateUtils.getSubjectAlternativeNames(peerCertificate).stream()
.filter(san -> san.getType() == DNS || san.getType() == IP || san.getType() == URI)
.map(SubjectAlternativeName::getValue)
.toList();
}
}
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