Github user mike-jumper commented on a diff in the pull request: https://github.com/apache/incubator-guacamole-client/pull/183#discussion_r143890795 --- Diff: guacamole-ext/src/main/java/org/apache/guacamole/properties/PrivateKeyGuacamoleProperty.java --- @@ -0,0 +1,95 @@ +/* + * 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.guacamole.properties; + +import java.io.BufferedInputStream; +import java.io.File; +import java.io.FileInputStream; +import java.io.FileNotFoundException; +import java.io.InputStream; +import java.io.IOException; +import java.lang.IllegalArgumentException; +import java.security.InvalidKeyException; +import java.security.KeyFactory; +import java.security.NoSuchAlgorithmException; +import java.security.PrivateKey; +import java.security.spec.InvalidKeySpecException; +import java.security.spec.KeySpec; +import java.security.spec.PKCS8EncodedKeySpec; +import org.apache.guacamole.GuacamoleServerException; +import org.apache.guacamole.environment.Environment; +import org.apache.guacamole.environment.LocalEnvironment; + +/** + * A GuacamoleProperty whose value is derived from a private key file. + */ +public abstract class PrivateKeyGuacamoleProperty implements GuacamoleProperty<PrivateKey> { + + @Override + public PrivateKey parseValue(String value) throws GuacamoleServerException { + + if (value == null || value.isEmpty()) + return null; + + try { + + // Open and read the file specified in the configuration. + File keyFile = new File(value); + InputStream keyInput = new BufferedInputStream(new FileInputStream(keyFile)); + int keyLength = (int) keyFile.length(); + final byte[] keyBytes = new byte[keyLength]; + int keyRead = keyInput.read(keyBytes); + + // Error reading any bytes out of the key. + if (keyRead == -1) + throw new GuacamoleServerException("Failed to get any bytes while reading key."); + + // Zero-sized key + else if(keyRead == 0) + throw new GuacamoleServerException("Failed to ready key because key is empty."); + + // Fewer bytes read than contained in the key + else if (keyRead < keyLength) --- End diff -- When reading in data from a file, while it's not guaranteed that each read will fill the buffer, returning fewer bytes than desired does not mean that future reads will fail. As long as end-of-file hasn't been reached (`read()` returns -1), and no error has been indicated (`IOException`), then `read()` should continue to be called until the buffer has been filled.
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