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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.controller.athenz.filter;
import com.google.inject.Inject;
import com.yahoo.jdisc.Response;
import com.yahoo.jdisc.http.filter.DiscFilterRequest;
import com.yahoo.jdisc.http.filter.security.cors.CorsFilterConfig;
import com.yahoo.jdisc.http.filter.security.cors.CorsRequestFilterBase;
import com.yahoo.vespa.athenz.api.AthenzPrincipal;
import com.yahoo.vespa.athenz.api.NToken;
import com.yahoo.vespa.athenz.utils.AthenzIdentities;
import com.yahoo.vespa.hosted.controller.api.integration.athenz.ZmsKeystore;
import com.yahoo.vespa.hosted.controller.athenz.config.AthenzConfig;
import java.security.cert.X509Certificate;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.Executor;
/**
* Authenticates Athenz principal, either through:
* 1. TLS client authentication (based on Athenz x509 identity certficiate).
* 2. The principal token (NToken) header.
* The TLS authentication is based on the following assumptions:
* - The underlying connector is configured with 'clientAuth' set to either WANT_AUTH or NEED_AUTH.
* - The trust store is configured with the Athenz CA certificates only.
*
* @author bjorncs
*/
// TODO bjorncs: Move this class to vespa-athenz bundle
public class AthenzPrincipalFilter extends CorsRequestFilterBase {
private final NTokenValidator validator;
private final String principalTokenHeader;
/**
* @param executor to preload the ZMS public keys with
*/
@Inject
public AthenzPrincipalFilter(ZmsKeystore zmsKeystore,
Executor executor,
AthenzConfig athenzConfig,
CorsFilterConfig corsConfig) {
this(new NTokenValidator(zmsKeystore), executor, athenzConfig.principalHeaderName(), new HashSet<>(corsConfig.allowedUrls()));
}
AthenzPrincipalFilter(NTokenValidator validator,
Executor executor,
String principalTokenHeader,
Set<String> corsAllowedUrls) {
super(corsAllowedUrls);
this.validator = validator;
this.principalTokenHeader = principalTokenHeader;
executor.execute(validator::preloadPublicKeys);
}
@Override
public Optional<ErrorResponse> filterRequest(DiscFilterRequest request) {
try {
Optional<AthenzPrincipal> certificatePrincipal = getClientCertificate(request)
.map(AthenzIdentities::from)
.map(AthenzPrincipal::new);
Optional<AthenzPrincipal> nTokenPrincipal = getPrincipalToken(request, principalTokenHeader)
.map(validator::validate);
if (!certificatePrincipal.isPresent() && !nTokenPrincipal.isPresent()) {
String errorMessage = "Unable to authenticate Athenz identity. " +
"Either client certificate or principal token is required.";
return Optional.of(new ErrorResponse(Response.Status.UNAUTHORIZED, errorMessage));
}
if (certificatePrincipal.isPresent() && nTokenPrincipal.isPresent()
&& !certificatePrincipal.get().getIdentity().equals(nTokenPrincipal.get().getIdentity())) {
String errorMessage = String.format(
"Identity in principal token does not match x509 CN: token-identity=%s, cert-identity=%s",
nTokenPrincipal.get().getIdentity().getFullName(),
certificatePrincipal.get().getIdentity().getFullName());
return Optional.of(new ErrorResponse(Response.Status.UNAUTHORIZED, errorMessage));
}
AthenzPrincipal principal = nTokenPrincipal.orElseGet(certificatePrincipal::get);
request.setUserPrincipal(principal);
request.setRemoteUser(principal.getName());
return Optional.empty();
} catch (Exception e) {
return Optional.of(new ErrorResponse(Response.Status.UNAUTHORIZED, e.getMessage()));
}
}
private static Optional<X509Certificate> getClientCertificate(DiscFilterRequest request) {
List<X509Certificate> chain = request.getClientCertificateChain();
if (chain.isEmpty()) return Optional.empty();
return Optional.of(chain.get(0));
}
private static Optional<NToken> getPrincipalToken(DiscFilterRequest request, String principalTokenHeaderName) {
return Optional.ofNullable(request.getHeader(principalTokenHeaderName))
.filter(token -> !token.isEmpty())
.map(NToken::new);
}
}
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