kafka ValidatorAccessTokenValidator 源码

  • 2022-10-20
  • 浏览 (421)

kafka ValidatorAccessTokenValidator 代码

文件路径:/clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/secured/ValidatorAccessTokenValidator.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.kafka.common.security.oauthbearer.internals.secured;

import static org.jose4j.jwa.AlgorithmConstraints.DISALLOW_NONE;

import java.util.Collection;
import java.util.Collections;
import java.util.Set;
import org.apache.kafka.common.security.oauthbearer.OAuthBearerToken;
import org.jose4j.jwt.JwtClaims;
import org.jose4j.jwt.MalformedClaimException;
import org.jose4j.jwt.NumericDate;
import org.jose4j.jwt.ReservedClaimNames;
import org.jose4j.jwt.consumer.InvalidJwtException;
import org.jose4j.jwt.consumer.JwtConsumer;
import org.jose4j.jwt.consumer.JwtConsumerBuilder;
import org.jose4j.jwt.consumer.JwtContext;
import org.jose4j.keys.resolvers.VerificationKeyResolver;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * ValidatorAccessTokenValidator is an implementation of {@link AccessTokenValidator} that is used
 * by the broker to perform more extensive validation of the JWT access token that is received
 * from the client, but ultimately from posting the client credentials to the OAuth/OIDC provider's
 * token endpoint.
 *
 * The validation steps performed (primary by the jose4j library) are:
 *
 * <ol>
 *     <li>
 *         Basic structural validation of the <code>b64token</code> value as defined in
 *         <a href="https://tools.ietf.org/html/rfc6750#section-2.1">RFC 6750 Section 2.1</a>
 *     </li>
 *     <li>Basic conversion of the token into an in-memory data structure</li>
 *     <li>
 *         Presence of scope, <code>exp</code>, subject, <code>iss</code>, and
 *         <code>iat</code> claims
 *     </li>
 *     <li>
 *         Signature matching validation against the <code>kid</code> and those provided by
 *         the OAuth/OIDC provider's JWKS
 *     </li>
 * </ol>
 */

public class ValidatorAccessTokenValidator implements AccessTokenValidator {

    private static final Logger log = LoggerFactory.getLogger(ValidatorAccessTokenValidator.class);

    private final JwtConsumer jwtConsumer;

    private final String scopeClaimName;

    private final String subClaimName;

    /**
     * Creates a new ValidatorAccessTokenValidator that will be used by the broker for more
     * thorough validation of the JWT.
     *
     * @param clockSkew               The optional value (in seconds) to allow for differences
     *                                between the time of the OAuth/OIDC identity provider and
     *                                the broker. If <code>null</code> is provided, the broker
     *                                and the OAUth/OIDC identity provider are assumed to have
     *                                very close clock settings.
     * @param expectedAudiences       The (optional) set the broker will use to verify that
     *                                the JWT was issued for one of the expected audiences.
     *                                The JWT will be inspected for the standard OAuth
     *                                <code>aud</code> claim and if this value is set, the
     *                                broker will match the value from JWT's <code>aud</code>
     *                                claim to see if there is an <b>exact</b> match. If there is no
     *                                match, the broker will reject the JWT and authentication
     *                                will fail. May be <code>null</code> to not perform any
     *                                check to verify the JWT's <code>aud</code> claim matches any
     *                                fixed set of known/expected audiences.
     * @param expectedIssuer          The (optional) value for the broker to use to verify that
     *                                the JWT was created by the expected issuer. The JWT will
     *                                be inspected for the standard OAuth <code>iss</code> claim
     *                                and if this value is set, the broker will match it
     *                                <b>exactly</b> against what is in the JWT's <code>iss</code>
     *                                claim. If there is no match, the broker will reject the JWT
     *                                and authentication will fail. May be <code>null</code> to not
     *                                perform any check to verify the JWT's <code>iss</code> claim
     *                                matches a specific issuer.
     * @param verificationKeyResolver jose4j-based {@link VerificationKeyResolver} that is used
     *                                to validate the signature matches the contents of the header
     *                                and payload
     * @param scopeClaimName          Name of the scope claim to use; must be non-<code>null</code>
     * @param subClaimName            Name of the subject claim to use; must be
     *                                non-<code>null</code>
     *
     * @see JwtConsumerBuilder
     * @see JwtConsumer
     * @see VerificationKeyResolver
     */

    public ValidatorAccessTokenValidator(Integer clockSkew,
        Set<String> expectedAudiences,
        String expectedIssuer,
        VerificationKeyResolver verificationKeyResolver,
        String scopeClaimName,
        String subClaimName) {
        final JwtConsumerBuilder jwtConsumerBuilder = new JwtConsumerBuilder();

        if (clockSkew != null)
            jwtConsumerBuilder.setAllowedClockSkewInSeconds(clockSkew);

        if (expectedAudiences != null && !expectedAudiences.isEmpty())
            jwtConsumerBuilder.setExpectedAudience(expectedAudiences.toArray(new String[0]));

        if (expectedIssuer != null)
            jwtConsumerBuilder.setExpectedIssuer(expectedIssuer);

        this.jwtConsumer = jwtConsumerBuilder
            .setJwsAlgorithmConstraints(DISALLOW_NONE)
            .setRequireExpirationTime()
            .setRequireIssuedAt()
            .setVerificationKeyResolver(verificationKeyResolver)
            .build();
        this.scopeClaimName = scopeClaimName;
        this.subClaimName = subClaimName;
    }

    /**
     * Accepts an OAuth JWT access token in base-64 encoded format, validates, and returns an
     * OAuthBearerToken.
     *
     * @param accessToken Non-<code>null</code> JWT access token
     * @return {@link OAuthBearerToken}
     * @throws ValidateException Thrown on errors performing validation of given token
     */

    @SuppressWarnings("unchecked")
    public OAuthBearerToken validate(String accessToken) throws ValidateException {
        SerializedJwt serializedJwt = new SerializedJwt(accessToken);

        JwtContext jwt;

        try {
            jwt = jwtConsumer.process(serializedJwt.getToken());
        } catch (InvalidJwtException e) {
            throw new ValidateException(String.format("Could not validate the access token: %s", e.getMessage()), e);
        }

        JwtClaims claims = jwt.getJwtClaims();

        Object scopeRaw = getClaim(() -> claims.getClaimValue(scopeClaimName), scopeClaimName);
        Collection<String> scopeRawCollection;

        if (scopeRaw instanceof String)
            scopeRawCollection = Collections.singletonList((String) scopeRaw);
        else if (scopeRaw instanceof Collection)
            scopeRawCollection = (Collection<String>) scopeRaw;
        else
            scopeRawCollection = Collections.emptySet();

        NumericDate expirationRaw = getClaim(claims::getExpirationTime, ReservedClaimNames.EXPIRATION_TIME);
        String subRaw = getClaim(() -> claims.getStringClaimValue(subClaimName), subClaimName);
        NumericDate issuedAtRaw = getClaim(claims::getIssuedAt, ReservedClaimNames.ISSUED_AT);

        Set<String> scopes = ClaimValidationUtils.validateScopes(scopeClaimName, scopeRawCollection);
        long expiration = ClaimValidationUtils.validateExpiration(ReservedClaimNames.EXPIRATION_TIME,
            expirationRaw != null ? expirationRaw.getValueInMillis() : null);
        String sub = ClaimValidationUtils.validateSubject(subClaimName, subRaw);
        Long issuedAt = ClaimValidationUtils.validateIssuedAt(ReservedClaimNames.ISSUED_AT,
            issuedAtRaw != null ? issuedAtRaw.getValueInMillis() : null);

        OAuthBearerToken token = new BasicOAuthBearerToken(accessToken,
            scopes,
            expiration,
            sub,
            issuedAt);

        return token;
    }

    private <T> T getClaim(ClaimSupplier<T> supplier, String claimName) throws ValidateException {
        try {
            T value = supplier.get();
            log.debug("getClaim - {}: {}", claimName, value);
            return value;
        } catch (MalformedClaimException e) {
            throw new ValidateException(String.format("Could not extract the '%s' claim from the access token", claimName), e);
        }
    }

    public interface ClaimSupplier<T> {

        T get() throws MalformedClaimException;

    }

}

相关信息

kafka 源码目录

相关文章

kafka AccessTokenRetriever 源码

kafka AccessTokenRetrieverFactory 源码

kafka AccessTokenValidator 源码

kafka AccessTokenValidatorFactory 源码

kafka BasicOAuthBearerToken 源码

kafka ClaimValidationUtils 源码

kafka CloseableVerificationKeyResolver 源码

kafka ConfigurationUtils 源码

kafka FileTokenRetriever 源码

kafka HttpAccessTokenRetriever 源码

0  赞