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/*
* Copyright 2017-2020 original authors
*
* Licensed 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
*
* https://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 io.micronaut.security.token.jwt.validator;
import com.nimbusds.jose.EncryptionMethod;
import com.nimbusds.jose.JOSEException;
import com.nimbusds.jose.JWEAlgorithm;
import com.nimbusds.jose.JWEHeader;
import com.nimbusds.jose.JWSAlgorithm;
import com.nimbusds.jwt.EncryptedJWT;
import com.nimbusds.jwt.JWT;
import com.nimbusds.jwt.JWTParser;
import com.nimbusds.jwt.PlainJWT;
import com.nimbusds.jwt.SignedJWT;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.annotation.Nullable;
import io.micronaut.http.HttpRequest;
import io.micronaut.security.token.jwt.encryption.EncryptionConfiguration;
import io.micronaut.security.token.jwt.generator.claims.JwtClaims;
import io.micronaut.security.token.jwt.generator.claims.JwtClaimsSetAdapter;
import io.micronaut.security.token.jwt.signature.SignatureConfiguration;
import io.micronaut.security.token.jwt.signature.jwks.JwksCache;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A builder style class for validating JWT tokens against any number of provided
* encryption or signature configurations and any claim validators.
*
* @author James Kleeh
* @since 1.4.0
*/
public final class JwtValidator {
private static final Logger LOG = LoggerFactory.getLogger(JwtValidator.class);
private static final String DOT = ".";
private final List signatures;
private final List encryptions;
private final List claimsValidators;
private JwtValidator(List signatures,
List encryptions,
List claimsValidators) {
this.signatures = signatures;
this.encryptions = encryptions;
this.claimsValidators = claimsValidators;
}
/**
* Validates the supplied token with any configurations and claim validators present.
*
* @param token The JWT string
* @param request HTTP Request
* @return An optional JWT token if validation succeeds
*/
public Optional validate(String token, @Nullable HttpRequest request) {
try {
if (hasAtLeastTwoDots(token)) {
JWT jwt = JWTParser.parse(token);
return validate(jwt, request);
} else {
if (LOG.isTraceEnabled()) {
LOG.trace("token {} does not contain two dots", token);
}
}
} catch (final ParseException e) {
if (LOG.isTraceEnabled()) {
LOG.trace("Failed to parse JWT: {}", e.getMessage());
}
}
return Optional.empty();
}
/**
*
* @param token The JWT string
* @return {@literal true} if the string has at least two dots. We must have 2 (JWS) or 4 dots (JWE).
*/
private boolean hasAtLeastTwoDots(String token) {
return (token.contains(DOT)) &&
(token.indexOf(DOT, token.indexOf(DOT) + 1) != -1);
}
/**
* Validates the supplied token with any configurations and claim validators present.
*
* @param token The JWT token
* @param request The HTTP Request which contained the JWT token
* @return An optional JWT token if validation succeeds
*/
public Optional validate(@NonNull JWT token, @Nullable HttpRequest request) {
Optional validationResult;
if (token instanceof PlainJWT) {
validationResult = validate((PlainJWT) token);
} else if (token instanceof EncryptedJWT) {
validationResult = validate((EncryptedJWT) token);
} else if (token instanceof SignedJWT) {
validationResult = validate((SignedJWT) token);
} else {
validationResult = Optional.empty();
}
if (claimsValidators.isEmpty()) {
return validationResult;
} else {
return validationResult.filter(jwt -> {
try {
JwtClaims claims = new JwtClaimsSetAdapter(jwt.getJWTClaimsSet());
return claimsValidators.stream().allMatch(validator -> validator.validate(claims, request));
} catch (ParseException e) {
if (LOG.isErrorEnabled()) {
LOG.error("Failed to retrieve the claims set", e);
}
return false;
}
});
}
}
private Optional validate(PlainJWT jwt) {
if (LOG.isDebugEnabled()) {
LOG.debug("Validating plain JWT");
}
if (signatures.isEmpty()) {
if (LOG.isDebugEnabled()) {
LOG.debug("JWT is not signed and no signature configurations -> verified");
}
return Optional.of(jwt);
} else {
if (LOG.isDebugEnabled()) {
LOG.debug("A non-signed JWT cannot be accepted as signature configurations have been defined");
}
return Optional.empty();
}
}
private Optional validate(EncryptedJWT jwt) {
if (LOG.isDebugEnabled()) {
LOG.debug("Validating encrypted JWT");
}
final JWEHeader header = jwt.getHeader();
List sortedConfigs = new ArrayList<>(encryptions);
sortedConfigs.sort(comparator(header));
for (EncryptionConfiguration config: sortedConfigs) {
if (LOG.isTraceEnabled()) {
LOG.trace("Using encryption configuration: {}", config);
}
try {
config.decrypt(jwt);
SignedJWT signedJWT = jwt.getPayload().toSignedJWT();
if (signedJWT == null) {
if (LOG.isDebugEnabled()) {
LOG.debug("Encrypted JWT couldn't be converted to a signed JWT.");
}
return Optional.empty();
}
return validate(signedJWT);
} catch (final JOSEException e) {
if (LOG.isDebugEnabled()) {
LOG.debug("Decryption fails with encryption configuration: {}, passing to the next one", config);
}
return Optional.empty();
}
}
if (LOG.isDebugEnabled() && encryptions.isEmpty()) {
LOG.debug("JWT is encrypted and no encryption configurations -> not verified");
}
return Optional.empty();
}
private Optional validate(SignedJWT jwt) {
if (LOG.isDebugEnabled()) {
LOG.debug("Validating signed JWT");
}
final JWSAlgorithm algorithm = jwt.getHeader().getAlgorithm();
List sortedConfigs = new ArrayList<>(signatures);
sortedConfigs.sort(comparator(algorithm, jwt.getHeader().getKeyID()));
Optional optionalJWT = validate(jwt, sortedConfigs);
if (optionalJWT.isPresent()) {
return optionalJWT;
}
// If any of the signature configurations is a JwksCache, evict the cache and attempt to verify again
for (SignatureConfiguration c : sortedConfigs) {
if (c instanceof JwksCache && ((JwksCache) c).isExpired()) {
((JwksCache) c).clear();
optionalJWT = validate(jwt, c);
if (optionalJWT.isPresent()) {
return optionalJWT;
}
}
}
if (LOG.isDebugEnabled() && signatures.isEmpty()) {
LOG.debug("JWT is signed and no signature configurations -> not verified");
}
return Optional.empty();
}
private Optional validate(SignedJWT jwt, SignatureConfiguration signatureConfiguration) {
try {
boolean verified = signatureConfiguration.verify(jwt);
if (!verified) {
if (LOG.isDebugEnabled()) {
LOG.debug("JWT Signature verification failed: {}", jwt.getParsedString());
}
} else {
return Optional.of(jwt);
}
} catch (final JOSEException e) {
if (LOG.isDebugEnabled()) {
LOG.debug("Verification failed with signature configuration: {}, passing to the next one", signatureConfiguration);
}
}
return Optional.empty();
}
private Optional validate(SignedJWT jwt, List signatureConfigurations) {
for (SignatureConfiguration config: signatureConfigurations) {
Optional optionalJWT = validate(jwt, config);
if (optionalJWT.isPresent()) {
return optionalJWT;
}
}
return Optional.empty();
}
private static int compareKeyIds(SignatureConfiguration sig,
SignatureConfiguration otherSig,
@Nullable String keyId) {
if (keyId == null) {
return 0;
}
Optional matchesKeyId = signatureConfigurationMatchesKeyId(sig, keyId);
Optional otherMatchesKeyId = signatureConfigurationMatchesKeyId(otherSig, keyId);
if (matchesKeyId.isPresent() && otherMatchesKeyId.isPresent()) {
return otherMatchesKeyId.get().compareTo(matchesKeyId.get());
} else if (matchesKeyId.isPresent()) {
return Boolean.TRUE.equals(matchesKeyId.get()) ? 1 : -1;
} else if (otherMatchesKeyId.isPresent()) {
return Boolean.TRUE.equals(otherMatchesKeyId.get()) ? 1 : -1;
}
return 0;
}
private static Comparator comparator(JWSAlgorithm algorithm, @Nullable String kid) {
return (sig, otherSig) -> {
int compareKids = compareKeyIds(sig, otherSig, kid);
if (compareKids != 0) {
return compareKids;
}
boolean supports = signatureConfigurationSupportsAlgorithm(sig, algorithm);
boolean otherSupports = signatureConfigurationSupportsAlgorithm(otherSig, algorithm);
if (supports == otherSupports) {
return 0;
} else if (supports) {
return -1;
} else {
return 1;
}
};
}
private static Optional signatureConfigurationMatchesKeyId(@NonNull SignatureConfiguration sig,
@NonNull String keyId) {
if (sig instanceof JwksCache) {
final Optional> keyIds = ((JwksCache) sig).getKeyIds();
return keyIds.map(ids -> ids.contains(keyId));
} else {
return Optional.empty();
}
}
private static boolean signatureConfigurationSupportsAlgorithm(@NonNull SignatureConfiguration sig, @NonNull JWSAlgorithm algorithm) {
// {@link JwksSignature#supports} does an HTTP request if the Json Web Key Set is not present.
// Thus, don't call it unless the keys have been already been fetched.
if (!(sig instanceof JwksCache) || ((JwksCache) sig).isPresent()) {
return sig.supports(algorithm);
}
return false;
}
private static Comparator comparator(JWEHeader header) {
final JWEAlgorithm algorithm = header.getAlgorithm();
final EncryptionMethod method = header.getEncryptionMethod();
return (sig, otherSig) -> {
boolean supports = sig.supports(algorithm, method);
boolean otherSupports = otherSig.supports(algorithm, method);
if (supports == otherSupports) {
return 0;
} else if (supports) {
return -1;
} else {
return 1;
}
};
}
/**
* @return A new JWT validator builder
*/
public static Builder builder() {
return new Builder();
}
/**
* A builder for {@link JwtValidator}.
*/
public static final class Builder {
private List signatures = new ArrayList<>();
private List encryptions = new ArrayList<>();
private List claimsValidators = new ArrayList<>();
private Builder() { }
/**
* Replaces any existing configurations with the ones supplied.
*
* @param signatureConfigurations The signature configurations to validate with
* @return The builder
*/
public Builder withSignatures(SignatureConfiguration... signatureConfigurations) {
signatures = Arrays.asList(signatureConfigurations);
return this;
}
/**
* Replaces any existing configurations with the ones supplied.
*
* @param signatureConfigurations The signature configurations to validate with
* @return The builder
*/
public Builder withSignatures(Collection signatureConfigurations) {
signatures = new ArrayList<>(signatureConfigurations);
return this;
}
/**
* Replaces any existing configurations with the ones supplied.
*
* @param encryptionConfigurations The encryption configurations to validate with
* @return The builder
*/
public Builder withEncryptions(EncryptionConfiguration... encryptionConfigurations) {
encryptions = Arrays.asList(encryptionConfigurations);
return this;
}
/**
* Replaces any existing configurations with the ones supplied.
*
* @param encryptionConfigurations The encryption configurations to validate with
* @return The builder
*/
public Builder withEncryptions(Collection encryptionConfigurations) {
encryptions = new ArrayList<>(encryptionConfigurations);
return this;
}
/**
* Replaces any existing claim validators with the ones supplied.
*
* @param jwtClaimsValidators The claims validators to use
* @return The builder
*/
public Builder withClaimValidators(JwtClaimsValidator... jwtClaimsValidators) {
claimsValidators = Arrays.asList(jwtClaimsValidators);
return this;
}
/**
* Replaces any existing claim validators with the ones supplied.
*
* @param jwtClaimsValidators The claims validators to use
* @return The builder
*/
public Builder withClaimValidators(Collection jwtClaimsValidators) {
claimsValidators = new ArrayList<>(jwtClaimsValidators);
return this;
}
/**
* Builds the validator.
*
* @return The validator
*/
public JwtValidator build() {
return new JwtValidator(signatures, encryptions, claimsValidators);
}
}
}
