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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.sshd.common.config;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StreamCorruptedException;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.OpenOption;
import java.nio.file.Path;
import java.util.Properties;
import java.util.concurrent.TimeUnit;
import org.apache.sshd.common.PropertyResolverUtils;
import org.apache.sshd.common.keyprovider.KeyPairProvider;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.io.NoCloseInputStream;
import org.apache.sshd.common.util.io.NoCloseReader;
import org.apache.sshd.common.util.net.SshdSocketAddress;
/**
* @author Apache MINA SSHD Project
* @see ssh_config(5)
*/
public final class ConfigFileReaderSupport {
public static final char COMMENT_CHAR = '#';
public static final String COMPRESSION_PROP = "Compression";
public static final String DEFAULT_COMPRESSION = CompressionConfigValue.NO.getName();
public static final String MAX_SESSIONS_CONFIG_PROP = "MaxSessions";
public static final int DEFAULT_MAX_SESSIONS = 10;
public static final String PASSWORD_AUTH_CONFIG_PROP = "PasswordAuthentication";
public static final String DEFAULT_PASSWORD_AUTH = "no";
public static final boolean DEFAULT_PASSWORD_AUTH_VALUE = parseBooleanValue(DEFAULT_PASSWORD_AUTH);
public static final String LISTEN_ADDRESS_CONFIG_PROP = "ListenAddress";
public static final String DEFAULT_BIND_ADDRESS = SshdSocketAddress.IPV4_ANYADDR;
public static final String PORT_CONFIG_PROP = "Port";
public static final String KEEP_ALIVE_CONFIG_PROP = "TCPKeepAlive";
public static final boolean DEFAULT_KEEP_ALIVE = true;
public static final String USE_DNS_CONFIG_PROP = "UseDNS";
// NOTE: the usual default is TRUE
public static final boolean DEFAULT_USE_DNS = true;
public static final String PUBKEY_AUTH_CONFIG_PROP = "PubkeyAuthentication";
public static final String DEFAULT_PUBKEY_AUTH = "yes";
public static final boolean DEFAULT_PUBKEY_AUTH_VALUE = parseBooleanValue(DEFAULT_PUBKEY_AUTH);
public static final String AUTH_KEYS_FILE_CONFIG_PROP = "AuthorizedKeysFile";
public static final String MAX_AUTH_TRIES_CONFIG_PROP = "MaxAuthTries";
public static final int DEFAULT_MAX_AUTH_TRIES = 6;
public static final String MAX_STARTUPS_CONFIG_PROP = "MaxStartups";
public static final int DEFAULT_MAX_STARTUPS = 10;
public static final String LOGIN_GRACE_TIME_CONFIG_PROP = "LoginGraceTime";
public static final long DEFAULT_LOGIN_GRACE_TIME = TimeUnit.SECONDS.toMillis(120);
public static final String KEY_REGENERATE_INTERVAL_CONFIG_PROP = "KeyRegenerationInterval";
public static final long DEFAULT_REKEY_TIME_LIMIT = TimeUnit.HOURS.toMillis(1L);
// see http://manpages.ubuntu.com/manpages/precise/en/man5/sshd_config.5.html
public static final String CIPHERS_CONFIG_PROP = "Ciphers";
public static final String DEFAULT_CIPHERS =
"aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour";
// see http://manpages.ubuntu.com/manpages/precise/en/man5/sshd_config.5.html
public static final String MACS_CONFIG_PROP = "MACs";
public static final String DEFAULT_MACS =
"hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,hmac-sha1-96,hmac-md5-96,hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96";
// see http://manpages.ubuntu.com/manpages/precise/en/man5/sshd_config.5.html
public static final String KEX_ALGORITHMS_CONFIG_PROP = "KexAlgorithms";
public static final String DEFAULT_KEX_ALGORITHMS =
"ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521"
+ "," + "diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1"
// RFC-8268 groups
+ "," + "diffie-hellman-group18-sha512,diffie-hellman-group17-sha512"
+ "," + "diffie-hellman-group16-sha512,diffie-hellman-group15-sha512"
+ "," + "diffie-hellman-group14-sha256"
// Legacy groups
+ "," + "diffie-hellman-group14-sha1,diffie-hellman-group1-sha1";
// see http://linux.die.net/man/5/ssh_config
public static final String HOST_KEY_ALGORITHMS_CONFIG_PROP = "HostKeyAlgorithms";
// see https://tools.ietf.org/html/rfc5656
public static final String DEFAULT_HOST_KEY_ALGORITHMS =
KeyPairProvider.SSH_RSA + "," + KeyPairProvider.SSH_DSS;
// see http://manpages.ubuntu.com/manpages/precise/en/man5/sshd_config.5.html
public static final String LOG_LEVEL_CONFIG_PROP = "LogLevel";
public static final LogLevelValue DEFAULT_LOG_LEVEL = LogLevelValue.INFO;
// see https://www.freebsd.org/cgi/man.cgi?query=sshd_config&sektion=5
public static final String SYSLOG_FACILITY_CONFIG_PROP = "SyslogFacility";
public static final SyslogFacilityValue DEFAULT_SYSLOG_FACILITY = SyslogFacilityValue.AUTH;
public static final String SUBSYSTEM_CONFIG_PROP = "Subsystem";
private ConfigFileReaderSupport() {
throw new UnsupportedOperationException("No instance");
}
public static Properties readConfigFile(Path path, OpenOption... options) throws IOException {
try (InputStream input = Files.newInputStream(path, options)) {
return readConfigFile(input, true);
}
}
public static Properties readConfigFile(URL url) throws IOException {
try (InputStream input = url.openStream()) {
return readConfigFile(input, true);
}
}
public static Properties readConfigFile(InputStream input, boolean okToClose) throws IOException {
try (Reader reader = new InputStreamReader(NoCloseInputStream.resolveInputStream(input, okToClose), StandardCharsets.UTF_8)) {
return readConfigFile(reader, true);
}
}
public static Properties readConfigFile(Reader reader, boolean okToClose) throws IOException {
try (BufferedReader buf = new BufferedReader(NoCloseReader.resolveReader(reader, okToClose))) {
return readConfigFile(buf);
}
}
/**
* Reads the configuration file contents into a {@link Properties} instance.
* Note: multiple keys value are concatenated using a comma - it is up to
* the caller to know which keys are expected to have multiple values and handle
* the split accordingly
*
* @param rdr The {@link BufferedReader} for reading the file
* @return The read properties
* @throws IOException If failed to read or malformed content
*/
public static Properties readConfigFile(BufferedReader rdr) throws IOException {
Properties props = new Properties();
int lineNumber = 1;
for (String line = rdr.readLine(); line != null; line = rdr.readLine(), lineNumber++) {
line = GenericUtils.replaceWhitespaceAndTrim(line);
if (GenericUtils.isEmpty(line)) {
continue;
}
int pos = line.indexOf(COMMENT_CHAR);
if (pos == 0) {
continue;
}
if (pos > 0) {
line = line.substring(0, pos);
line = line.trim();
}
/*
* Some options use '=', others use ' ' - try both
* NOTE: we do not validate the format for each option separately
*/
pos = line.indexOf(' ');
if (pos < 0) {
pos = line.indexOf('=');
}
if (pos < 0) {
throw new StreamCorruptedException("No delimiter at line " + lineNumber + ": " + line);
}
String key = line.substring(0, pos);
String value = line.substring(pos + 1).trim();
// see if need to concatenate multi-valued keys
String prev = props.getProperty(key);
if (!GenericUtils.isEmpty(prev)) {
value = prev + "," + value;
}
props.setProperty(key, value);
}
return props;
}
/**
* @param v Checks if the value is "yes", "y",
* "on", "t" or "true".
* @return The result - Note: {@code null}/empty values are
* interpreted as {@code false}
* @see PropertyResolverUtils#TRUE_VALUES
*/
public static boolean parseBooleanValue(String v) {
if (GenericUtils.isEmpty(v)) {
return false;
}
return PropertyResolverUtils.TRUE_VALUES.contains(v);
}
/**
* Returns a "yes" or "no" value based on the input
* parameter
*
* @param flag The required state
* @return "yes" if {@code true}, "no" otherwise
*/
public static String yesNoValueOf(boolean flag) {
return flag ? "yes" : "no";
}
}
