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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.filters.cors.CorsSecurityFilterConfig;
import com.yahoo.log.LogLevel;
import com.yahoo.vespa.athenz.api.AthenzPrincipal;
import com.yahoo.vespa.athenz.api.AthenzUser;
import com.yahoo.vespa.athenz.api.NToken;
import com.yahoo.vespa.hosted.controller.api.identifiers.UserId;
import com.yahoo.vespa.hosted.controller.api.integration.athenz.ZmsKeystore;
import com.yahoo.vespa.hosted.controller.athenz.config.AthenzConfig;
import com.yahoo.yolean.chain.After;
import java.security.Principal;
import java.util.Optional;
import java.util.concurrent.Executor;
import java.util.logging.Logger;
import java.util.stream.Stream;
/**
* A variant of the {@link AthenzPrincipalFilter} to be used in combination with a cookie-based
* security filter for user authentication
* Assumes that the user authentication filter configured in the same filter chain and is configured to run before this filter.
*
* @author bjorncs
*/
// TODO Remove this filter once migrated to Okta
@After({"CorsPreflightSecurityRequestFilter", "BouncerFilter"})
public class UserAuthWithAthenzPrincipalFilter extends AthenzPrincipalFilter {
private static final Logger log = Logger.getLogger(UserAuthWithAthenzPrincipalFilter.class.getName());
private final String userAuthenticationPassThruAttribute;
private final String principalHeaderName;
@Inject
public UserAuthWithAthenzPrincipalFilter(ZmsKeystore zmsKeystore,
Executor executor,
AthenzConfig athenzConfig,
CorsSecurityFilterConfig corsConfig) {
super(zmsKeystore, executor, athenzConfig, corsConfig);
this.userAuthenticationPassThruAttribute = athenzConfig.userAuthenticationPassThruAttribute();
this.principalHeaderName = athenzConfig.principalHeaderName();
}
@Override
public Optional<ErrorResponse> filter(DiscFilterRequest request) {
if (request.getMethod().equals("OPTIONS")) return Optional.empty(); // Skip authentication on OPTIONS - required for Javascript CORS
try {
switch (getUserAuthenticationResult(request)) {
case USER_COOKIE_MISSING:
case USER_COOKIE_ALTERNATIVE_MISSING:
return super.filter(request); // Cookie-based authentication failed, delegate to Athenz
case USER_COOKIE_OK:
rewriteUserPrincipalToAthenz(request);
return Optional.empty(); // Authenticated using user cookie
case USER_COOKIE_INVALID:
return Optional.of(new ErrorResponse(Response.Status.UNAUTHORIZED, "Your user cookie is invalid (either expired, tampered or invalid ip)"));
default:
return Optional.empty();
}
} catch (Exception e) {
log.log(LogLevel.WARNING, "Authentication failed: " + e.getMessage(), e);
return Optional.of(new ErrorResponse(Response.Status.INTERNAL_SERVER_ERROR, e.getMessage()));
}
}
private UserAuthenticationResult getUserAuthenticationResult(DiscFilterRequest request) {
if (!request.containsAttribute(userAuthenticationPassThruAttribute)) {
throw new IllegalStateException("User authentication filter passthru attribute missing");
}
Integer statusCode = (Integer) request.getAttribute(userAuthenticationPassThruAttribute);
return Stream.of(UserAuthenticationResult.values())
.filter(uar -> uar.statusCode == statusCode)
.findAny()
.orElseThrow(() -> new IllegalStateException("Invalid status code: " + statusCode));
}
private void rewriteUserPrincipalToAthenz(DiscFilterRequest request) {
Principal userPrincipal = request.getUserPrincipal();
log.log(LogLevel.DEBUG, () -> "Original user principal: " + userPrincipal.toString());
UserId userId = new UserId(userPrincipal.getName());
AthenzUser athenzIdentity = AthenzUser.fromUserId(userId.id());
request.setRemoteUser(athenzIdentity.getFullName());
NToken nToken = Optional.ofNullable(request.getHeader(principalHeaderName)).map(NToken::new).orElse(null);
request.setUserPrincipal(new AthenzPrincipal(athenzIdentity, nToken));
}
private enum UserAuthenticationResult {
USER_COOKIE_MISSING(0),
USER_COOKIE_OK(1),
USER_COOKIE_INVALID(-1),
USER_COOKIE_ALTERNATIVE_MISSING(-2);
final int statusCode;
UserAuthenticationResult(int statusCode) {
this.statusCode = statusCode;
}
}
}
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