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/**
* 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.hadoop.security;
import org.apache.hadoop.thirdparty.protobuf.ByteString;
import java.io.BufferedInputStream;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableUtils;
import org.apache.hadoop.ipc.ProtobufHelper;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.security.token.TokenIdentifier;
import org.apache.hadoop.security.proto.SecurityProtos.CredentialsKVProto;
import org.apache.hadoop.security.proto.SecurityProtos.CredentialsProto;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A class that provides the facilities of reading and writing
* secret keys and Tokens.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class Credentials implements Writable {
public enum SerializedFormat {
WRITABLE((byte) 0x00),
PROTOBUF((byte) 0x01);
// Caching to avoid reconstructing the array each time.
private static final SerializedFormat[] FORMATS = values();
final byte value;
SerializedFormat(byte val) {
this.value = val;
}
public static SerializedFormat valueOf(int val) {
try {
return FORMATS[val];
} catch (ArrayIndexOutOfBoundsException e) {
throw new IllegalArgumentException("Unknown credential format: " + val);
}
}
}
private static final Logger LOG = LoggerFactory.getLogger(Credentials.class);
private Map secretKeysMap = new HashMap();
private Map> tokenMap =
new HashMap>();
/**
* Create an empty credentials instance.
*/
public Credentials() {
}
/**
* Create a copy of the given credentials.
* @param credentials to copy
*/
public Credentials(Credentials credentials) {
this.addAll(credentials);
}
/**
* Returns the Token object for the alias.
* @param alias the alias for the Token
* @return token for this alias
*/
public Token getToken(Text alias) {
return tokenMap.get(alias);
}
/**
* Add a token in the storage (in memory).
* @param alias the alias for the key
* @param t the token object
*/
public void addToken(Text alias, Token t) {
if (t == null) {
LOG.warn("Null token ignored for " + alias);
} else if (tokenMap.put(alias, t) != null) {
// Update private tokens
Map> tokensToAdd =
new HashMap<>();
for (Map.Entry> e :
tokenMap.entrySet()) {
Token token = e.getValue();
if (token.isPrivateCloneOf(alias)) {
tokensToAdd.put(e.getKey(), t.privateClone(token.getService()));
}
}
tokenMap.putAll(tokensToAdd);
}
}
/**
* Return all the tokens in the in-memory map.
*/
public Collection> getAllTokens() {
return tokenMap.values();
}
/**
* Returns an unmodifiable version of the full map of aliases to Tokens.
*/
public Map> getTokenMap() {
return Collections.unmodifiableMap(tokenMap);
}
/**
* @return number of Tokens in the in-memory map
*/
public int numberOfTokens() {
return tokenMap.size();
}
/**
* Returns the key bytes for the alias.
* @param alias the alias for the key
* @return key for this alias
*/
public byte[] getSecretKey(Text alias) {
return secretKeysMap.get(alias);
}
/**
* @return number of keys in the in-memory map
*/
public int numberOfSecretKeys() {
return secretKeysMap.size();
}
/**
* Set the key for an alias.
* @param alias the alias for the key
* @param key the key bytes
*/
public void addSecretKey(Text alias, byte[] key) {
secretKeysMap.put(alias, key);
}
/**
* Remove the key for a given alias.
* @param alias the alias for the key
*/
public void removeSecretKey(Text alias) {
secretKeysMap.remove(alias);
}
/**
* Return all the secret key entries in the in-memory map.
*/
public List getAllSecretKeys() {
List list = new java.util.ArrayList();
list.addAll(secretKeysMap.keySet());
return list;
}
/**
* Returns an unmodifiable version of the full map of aliases to secret keys.
*/
public Map getSecretKeyMap() {
return Collections.unmodifiableMap(secretKeysMap);
}
/**
* Convenience method for reading a token storage file and loading its Tokens.
* @param filename
* @param conf
* @throws IOException
*/
public static Credentials readTokenStorageFile(Path filename,
Configuration conf)
throws IOException {
FSDataInputStream in = null;
Credentials credentials = new Credentials();
try {
in = filename.getFileSystem(conf).open(filename);
credentials.readTokenStorageStream(in);
in.close();
return credentials;
} catch(IOException ioe) {
throw IOUtils.wrapException(filename.toString(), "Credentials"
+ ".readTokenStorageFile", ioe);
} finally {
IOUtils.cleanupWithLogger(LOG, in);
}
}
/**
* Convenience method for reading a token storage file and loading its Tokens.
* @param filename
* @param conf
* @throws IOException
*/
public static Credentials readTokenStorageFile(File filename,
Configuration conf)
throws IOException {
DataInputStream in = null;
Credentials credentials = new Credentials();
try {
in = new DataInputStream(new BufferedInputStream(
Files.newInputStream(filename.toPath())));
credentials.readTokenStorageStream(in);
return credentials;
} catch(IOException ioe) {
throw new IOException("Exception reading " + filename, ioe);
} finally {
IOUtils.cleanupWithLogger(LOG, in);
}
}
/**
* Convenience method for reading a token from a DataInputStream.
*/
public void readTokenStorageStream(DataInputStream in) throws IOException {
byte[] magic = new byte[TOKEN_STORAGE_MAGIC.length];
in.readFully(magic);
if (!Arrays.equals(magic, TOKEN_STORAGE_MAGIC)) {
throw new IOException("Bad header found in token storage.");
}
SerializedFormat format;
try {
format = SerializedFormat.valueOf(in.readByte());
} catch (IllegalArgumentException e) {
throw new IOException(e);
}
switch (format) {
case WRITABLE:
readFields(in);
break;
case PROTOBUF:
readProto(in);
break;
default:
throw new IOException("Unsupported format " + format);
}
}
private static final byte[] TOKEN_STORAGE_MAGIC =
"HDTS".getBytes(StandardCharsets.UTF_8);
public void writeTokenStorageToStream(DataOutputStream os)
throws IOException {
// by default store in the oldest supported format for compatibility
writeTokenStorageToStream(os, SerializedFormat.WRITABLE);
}
public void writeTokenStorageToStream(DataOutputStream os,
SerializedFormat format) throws IOException {
switch (format) {
case WRITABLE:
writeWritableOutputStream(os);
break;
case PROTOBUF:
writeProtobufOutputStream(os);
break;
default:
throw new IllegalArgumentException("Unsupported serialized format: "
+ format);
}
}
private void writeWritableOutputStream(DataOutputStream os)
throws IOException {
os.write(TOKEN_STORAGE_MAGIC);
os.write(SerializedFormat.WRITABLE.value);
write(os);
}
private void writeProtobufOutputStream(DataOutputStream os)
throws IOException {
os.write(TOKEN_STORAGE_MAGIC);
os.write(SerializedFormat.PROTOBUF.value);
writeProto(os);
}
public void writeTokenStorageFile(Path filename,
Configuration conf) throws IOException {
// by default store in the oldest supported format for compatibility
writeTokenStorageFile(filename, conf, SerializedFormat.WRITABLE);
}
public void writeTokenStorageFile(Path filename, Configuration conf,
SerializedFormat format) throws IOException {
try (FSDataOutputStream os =
filename.getFileSystem(conf).create(filename)) {
writeTokenStorageToStream(os, format);
}
}
/**
* Stores all the keys to DataOutput.
* @param out
* @throws IOException
*/
@Override
public void write(DataOutput out) throws IOException {
// write out tokens first
WritableUtils.writeVInt(out, tokenMap.size());
for(Map.Entry> e: tokenMap.entrySet()) {
e.getKey().write(out);
e.getValue().write(out);
}
// now write out secret keys
WritableUtils.writeVInt(out, secretKeysMap.size());
for(Map.Entry e : secretKeysMap.entrySet()) {
e.getKey().write(out);
WritableUtils.writeVInt(out, e.getValue().length);
out.write(e.getValue());
}
}
/**
* Write contents of this instance as CredentialsProto message to DataOutput.
* @param out
* @throws IOException
*/
void writeProto(DataOutput out) throws IOException {
CredentialsProto.Builder storage = CredentialsProto.newBuilder();
for (Map.Entry> e :
tokenMap.entrySet()) {
CredentialsKVProto.Builder kv = CredentialsKVProto.newBuilder().
setAliasBytes(ByteString.copyFrom(
e.getKey().getBytes(), 0, e.getKey().getLength())).
setToken(ProtobufHelper.protoFromToken(e.getValue()));
storage.addTokens(kv.build());
}
for(Map.Entry e : secretKeysMap.entrySet()) {
CredentialsKVProto.Builder kv = CredentialsKVProto.newBuilder().
setAliasBytes(ByteString.copyFrom(
e.getKey().getBytes(), 0, e.getKey().getLength())).
setSecret(ByteString.copyFrom(e.getValue()));
storage.addSecrets(kv.build());
}
storage.build().writeDelimitedTo((DataOutputStream)out);
}
/**
* Populates keys/values from proto buffer storage.
* @param in - stream ready to read a serialized proto buffer message
*/
void readProto(DataInput in) throws IOException {
CredentialsProto storage = CredentialsProto.parseDelimitedFrom((DataInputStream)in);
for (CredentialsKVProto kv : storage.getTokensList()) {
addToken(new Text(kv.getAliasBytes().toByteArray()),
ProtobufHelper.tokenFromProto(kv.getToken()));
}
for (CredentialsKVProto kv : storage.getSecretsList()) {
addSecretKey(new Text(kv.getAliasBytes().toByteArray()),
kv.getSecret().toByteArray());
}
}
/**
* Loads all the keys.
* @param in
* @throws IOException
*/
@Override
public void readFields(DataInput in) throws IOException {
secretKeysMap.clear();
tokenMap.clear();
int size = WritableUtils.readVInt(in);
for(int i=0; i t = new Token();
t.readFields(in);
tokenMap.put(alias, t);
}
size = WritableUtils.readVInt(in);
for(int i=0; i secret: other.secretKeysMap.entrySet()) {
Text key = secret.getKey();
if (!secretKeysMap.containsKey(key) || overwrite) {
secretKeysMap.put(key, secret.getValue());
}
}
for(Map.Entry> token: other.tokenMap.entrySet()){
Text key = token.getKey();
if (!tokenMap.containsKey(key) || overwrite) {
addToken(key, token.getValue());
}
}
}
}
