io.grpc.TlsChannelCredentials Maven / Gradle / Ivy
/*
* Copyright 2020 The gRPC 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
*
* 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 io.grpc;
import com.google.common.io.ByteStreams;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.EnumSet;
import java.util.List;
import java.util.Set;
import javax.net.ssl.KeyManager;
import javax.net.ssl.TrustManager;
/**
* TLS credentials, providing server authentication and encryption. Consumers of this credential
* must verify they understand the configuration via the {@link #incomprehensible
* incomprehensible()} method. Unless overridden by a {@code Feature}, server verification should
* use customary default root certificates.
*/
public final class TlsChannelCredentials extends ChannelCredentials {
/** Use TLS with its defaults. */
public static ChannelCredentials create() {
return newBuilder().build();
}
private final boolean fakeFeature;
private final byte[] certificateChain;
private final byte[] privateKey;
private final String privateKeyPassword;
private final List keyManagers;
private final byte[] rootCertificates;
private final List trustManagers;
TlsChannelCredentials(Builder builder) {
fakeFeature = builder.fakeFeature;
certificateChain = builder.certificateChain;
privateKey = builder.privateKey;
privateKeyPassword = builder.privateKeyPassword;
keyManagers = builder.keyManagers;
rootCertificates = builder.rootCertificates;
trustManagers = builder.trustManagers;
}
/**
* The certificate chain for the client's identity, as a new byte array. Generally should be
* PEM-encoded. If {@code null}, some feature is providing key manager information via a different
* method or no client identity is available.
*/
public byte[] getCertificateChain() {
if (certificateChain == null) {
return null;
}
return Arrays.copyOf(certificateChain, certificateChain.length);
}
/**
* The private key for the client's identity, as a new byte array. Generally should be in PKCS#8
* format. If encrypted, {@link #getPrivateKeyPassword} is the decryption key. If unencrypted, the
* password will be {@code null}. If {@code null}, some feature is providing key manager
* information via a different method or no client identity is available.
*/
public byte[] getPrivateKey() {
if (privateKey == null) {
return null;
}
return Arrays.copyOf(privateKey, privateKey.length);
}
/** Returns the password to decrypt the private key, or {@code null} if unencrypted. */
public String getPrivateKeyPassword() {
return privateKeyPassword;
}
/**
* Returns the key manager list which provides the client's identity. Entries are scanned checking
* for specific types, like {@link javax.net.ssl.X509KeyManager}. Only a single entry for a type
* is used. Entries earlier in the list are higher priority. If {@code null}, key manager
* information is provided via a different method or no client identity is available.
*/
public List getKeyManagers() {
return keyManagers;
}
/**
* Root trust certificates for verifying the server's identity that override the system's
* defaults. Generally PEM-encoded with multiple certificates concatenated.
*/
public byte[] getRootCertificates() {
if (rootCertificates == null) {
return null;
}
return Arrays.copyOf(rootCertificates, rootCertificates.length);
}
/**
* Returns the trust manager list which verifies the server's identity. Entries are scanned
* checking for specific types, like {@link javax.net.ssl.X509TrustManager}. Only a single entry
* for a type is used. Entries earlier in the list are higher priority. If {@code null}, trust
* manager information is provided via the system's default or a different method.
*/
public List getTrustManagers() {
return trustManagers;
}
/**
* Returns an empty set if this credential can be adequately understood via
* the features listed, otherwise returns a hint of features that are lacking
* to understand the configuration to be used for manual debugging.
*
* An "understood" feature does not imply the caller is able to fully
* handle the feature. It simply means the caller understands the feature
* enough to use the appropriate APIs to read the configuration. The caller
* may support just a subset of a feature, in which case the caller would
* need to look at the configuration to determine if only the supported
* subset is used.
*
*
This method may not be as simple as a set difference. There may be
* multiple features that can independently satisfy a piece of configuration.
* If the configuration is incomprehensible, all such features would be
* returned, even though only one may be necessary.
*
*
An empty set does not imply that the credentials are fully understood.
* There may be optional configuration that can be ignored if not understood.
*
*
Since {@code Feature} is an {@code enum}, {@code understoodFeatures}
* should generally be an {@link java.util.EnumSet}. {@code
* understoodFeatures} will not be modified.
*
* @param understoodFeatures the features understood by the caller
* @return empty set if the caller can adequately understand the configuration
*/
public Set incomprehensible(Set understoodFeatures) {
Set incomprehensible = EnumSet.noneOf(Feature.class);
if (fakeFeature) {
requiredFeature(understoodFeatures, incomprehensible, Feature.FAKE);
}
if (rootCertificates != null || privateKey != null || keyManagers != null) {
requiredFeature(understoodFeatures, incomprehensible, Feature.MTLS);
}
if (keyManagers != null || trustManagers != null) {
requiredFeature(understoodFeatures, incomprehensible, Feature.CUSTOM_MANAGERS);
}
return Collections.unmodifiableSet(incomprehensible);
}
private static void requiredFeature(
Set understoodFeatures, Set incomprehensible, Feature feature) {
if (!understoodFeatures.contains(feature)) {
incomprehensible.add(feature);
}
}
@Override
public ChannelCredentials withoutBearerTokens() {
return this;
}
/**
* Features to understand TLS configuration. Additional enum values may be added in the future.
*/
public enum Feature {
/**
* A feature that no consumer should understand. It should be used for unit testing to confirm
* a call to {@link #incomprehensible incomprehensible()} is implemented properly.
*/
FAKE,
/**
* Client identity may be provided and server verification can be tuned. This feature requires
* observing {@link #getCertificateChain}, {@link #getPrivateKey}, and {@link
* #getPrivateKeyPassword} as well as {@link #getRootCertificates()}. The certificate chain and
* private key are used to configure a key manager to provide the client's identity. If no
* certificate chain and private key are provided the client will have no identity. The root
* certificates are used to configure a trust manager for verifying the server's identity. If no
* root certificates are provided the trust manager will default to the system's root
* certificates.
*/
MTLS,
/**
* Key managers and trust managers may be specified as {@link KeyManager} and {@link
* TrustManager} objects. This feature requires observing {@link #getKeyManagers()} and {@link
* #getTrustManagers()}. Generally {@link #MTLS} should also be supported, as that is the more
* common method of configuration. When a manager is non-{@code null}, then it is wholly
* responsible for key or trust material and usage; there is no need to check other manager
* sources like {@link #getCertificateChain()} or {@link #getPrivateKey()} (if {@code
* KeyManager} is available), or {@link #getRootCertificates()} (if {@code TrustManager} is
* available).
*
* If other manager sources are available (e.g., {@code getPrivateKey() != null}), then they
* may be alternative representations of the same configuration and the consumer is free to use
* those alternative representations if it prefers. But before doing so it must first
* check that it understands that alternative representation by using {@link #incomprehensible}
* without the {@code CUSTOM_MANAGERS} feature.
*/
CUSTOM_MANAGERS,
;
}
/** Creates a builder for changing default configuration. */
public static Builder newBuilder() {
return new Builder();
}
/** Builder for {@link TlsChannelCredentials}. */
public static final class Builder {
private boolean fakeFeature;
private byte[] certificateChain;
private byte[] privateKey;
private String privateKeyPassword;
private List keyManagers;
private byte[] rootCertificates;
private List trustManagers;
private Builder() {}
/**
* Requires {@link Feature#FAKE} to be understood. For use in testing consumers of this
* credential.
*/
public Builder requireFakeFeature() {
fakeFeature = true;
return this;
}
/**
* Use the provided certificate chain and private key as the client's identity. Generally they
* should be PEM-encoded and the key is an unencrypted PKCS#8 key (file headers have "BEGIN
* CERTIFICATE" and "BEGIN PRIVATE KEY").
*/
public Builder keyManager(File certChain, File privateKey) throws IOException {
return keyManager(certChain, privateKey, null);
}
/**
* Use the provided certificate chain and possibly-encrypted private key as the client's
* identity. Generally they should be PEM-encoded and the key is a PKCS#8 key. If the private
* key is unencrypted, then password must be {@code null}.
*/
public Builder keyManager(File certChain, File privateKey, String privateKeyPassword)
throws IOException {
InputStream certChainIs = new FileInputStream(certChain);
try {
InputStream privateKeyIs = new FileInputStream(privateKey);
try {
return keyManager(certChainIs, privateKeyIs, privateKeyPassword);
} finally {
privateKeyIs.close();
}
} finally {
certChainIs.close();
}
}
/**
* Use the provided certificate chain and private key as the client's identity. Generally they
* should be PEM-encoded and the key is an unencrypted PKCS#8 key (file headers have "BEGIN
* CERTIFICATE" and "BEGIN PRIVATE KEY").
*/
public Builder keyManager(InputStream certChain, InputStream privateKey) throws IOException {
return keyManager(certChain, privateKey, null);
}
/**
* Use the provided certificate chain and possibly-encrypted private key as the client's
* identity. Generally they should be PEM-encoded and the key is a PKCS#8 key. If the private
* key is unencrypted, then password must be {@code null}.
*/
public Builder keyManager(
InputStream certChain, InputStream privateKey, String privateKeyPassword)
throws IOException {
byte[] certChainBytes = ByteStreams.toByteArray(certChain);
byte[] privateKeyBytes = ByteStreams.toByteArray(privateKey);
clearKeyManagers();
this.certificateChain = certChainBytes;
this.privateKey = privateKeyBytes;
this.privateKeyPassword = privateKeyPassword;
return this;
}
/**
* Have the provided key manager select the client's identity. Although multiple are allowed,
* only the first instance implementing a particular interface is used. So generally there will
* just be a single entry and it implements {@link javax.net.ssl.X509KeyManager}.
*/
public Builder keyManager(KeyManager... keyManagers) {
List keyManagerList = Collections.unmodifiableList(new ArrayList<>(
Arrays.asList(keyManagers)));
clearKeyManagers();
this.keyManagers = keyManagerList;
return this;
}
private void clearKeyManagers() {
this.certificateChain = null;
this.privateKey = null;
this.privateKeyPassword = null;
this.keyManagers = null;
}
/**
* Use the provided root certificates to verify the server's identity instead of the system's
* default. Generally they should be PEM-encoded with all the certificates concatenated together
* (file header has "BEGIN CERTIFICATE", and would occur once per certificate).
*/
public Builder trustManager(File rootCerts) throws IOException {
InputStream rootCertsIs = new FileInputStream(rootCerts);
try {
return trustManager(rootCertsIs);
} finally {
rootCertsIs.close();
}
}
/**
* Use the provided root certificates to verify the server's identity instead of the system's
* default. Generally they should be PEM-encoded with all the certificates concatenated together
* (file header has "BEGIN CERTIFICATE", and would occur once per certificate).
*/
public Builder trustManager(InputStream rootCerts) throws IOException {
byte[] rootCertsBytes = ByteStreams.toByteArray(rootCerts);
clearTrustManagers();
this.rootCertificates = rootCertsBytes;
return this;
}
/**
* Have the provided trust manager verify the server's identity instead of the system's default.
* Although multiple are allowed, only the first instance implementing a particular interface is
* used. So generally there will just be a single entry and it implements {@link
* javax.net.ssl.X509TrustManager}.
*/
public Builder trustManager(TrustManager... trustManagers) {
List trustManagerList = Collections.unmodifiableList(new ArrayList<>(
Arrays.asList(trustManagers)));
clearTrustManagers();
this.trustManagers = trustManagerList;
return this;
}
private void clearTrustManagers() {
this.rootCertificates = null;
this.trustManagers = null;
}
/** Construct the credentials. */
public ChannelCredentials build() {
return new TlsChannelCredentials(this);
}
}
}