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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.client.config.hosts;
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.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.sshd.common.config.ConfigFileReaderSupport;
import org.apache.sshd.common.config.keys.AuthorizedKeyEntry;
import org.apache.sshd.common.config.keys.PublicKeyEntry;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.ValidateUtils;
import org.apache.sshd.common.util.io.NoCloseInputStream;
import org.apache.sshd.common.util.io.NoCloseReader;
/**
* Contains a representation of an entry in the known_hosts file
*
* @author Apache MINA SSHD Project
* @see sshd(8) man page
*/
public class KnownHostEntry extends HostPatternsHolder {
/**
* Character that denotes that start of a marker
*/
public static final char MARKER_INDICATOR = '@';
/**
* Standard OpenSSH config file name
*/
public static final String STD_HOSTS_FILENAME = "known_hosts";
private static final class LazyDefaultConfigFileHolder {
private static final Path HOSTS_FILE = PublicKeyEntry.getDefaultKeysFolderPath().resolve(STD_HOSTS_FILENAME);
private LazyDefaultConfigFileHolder() {
throw new UnsupportedOperationException("No instance allowed");
}
}
private String line;
private String marker;
private AuthorizedKeyEntry keyEntry;
private KnownHostHashValue hashedEntry;
public KnownHostEntry() {
super();
}
/**
* @param line The original line from which this entry was created
*/
public KnownHostEntry(String line) {
this.line = line;
}
/**
* @return The original line from which this entry was created
*/
public String getConfigLine() {
return line;
}
public void setConfigLine(String line) {
this.line = line;
}
public String getMarker() {
return marker;
}
public void setMarker(String marker) {
this.marker = marker;
}
public AuthorizedKeyEntry getKeyEntry() {
return keyEntry;
}
public void setKeyEntry(AuthorizedKeyEntry keyEntry) {
this.keyEntry = keyEntry;
}
public KnownHostHashValue getHashedEntry() {
return hashedEntry;
}
public void setHashedEntry(KnownHostHashValue hashedEntry) {
this.hashedEntry = hashedEntry;
}
@Override
public boolean isHostMatch(String host, int port) {
if (super.isHostMatch(host, port)) {
return true;
}
KnownHostHashValue hash = getHashedEntry();
return (hash != null) && hash.isHostMatch(host, port);
}
@Override
public String toString() {
return getConfigLine();
}
/**
* @return The default {@link Path} location of the OpenSSH known hosts file
*/
@SuppressWarnings("synthetic-access")
public static Path getDefaultKnownHostsFile() {
return LazyDefaultConfigFileHolder.HOSTS_FILE;
}
public static List readKnownHostEntries(Path path, OpenOption... options) throws IOException {
try (InputStream input = Files.newInputStream(path, options)) {
return readKnownHostEntries(input, true);
}
}
public static List readKnownHostEntries(URL url) throws IOException {
try (InputStream input = url.openStream()) {
return readKnownHostEntries(input, true);
}
}
public static List readKnownHostEntries(InputStream inStream, boolean okToClose) throws IOException {
try (Reader reader
= new InputStreamReader(NoCloseInputStream.resolveInputStream(inStream, okToClose), StandardCharsets.UTF_8)) {
return readKnownHostEntries(reader, true);
}
}
public static List readKnownHostEntries(Reader rdr, boolean okToClose) throws IOException {
try (BufferedReader buf = new BufferedReader(NoCloseReader.resolveReader(rdr, okToClose))) {
return readKnownHostEntries(buf);
}
}
/**
* Reads configuration entries
*
* @param rdr The {@link BufferedReader} to use
* @return The {@link List} of read {@link KnownHostEntry}-ies
* @throws IOException If failed to parse the read configuration
*/
public static List readKnownHostEntries(BufferedReader rdr) throws IOException {
List entries = null;
int lineNumber = 1;
for (String line = rdr.readLine(); line != null; line = rdr.readLine(), lineNumber++) {
line = GenericUtils.trimToEmpty(line);
if (GenericUtils.isEmpty(line)) {
continue;
}
int pos = line.indexOf(ConfigFileReaderSupport.COMMENT_CHAR);
if (pos == 0) {
continue;
}
if (pos > 0) {
line = line.substring(0, pos);
line = line.trim();
}
try {
KnownHostEntry entry = parseKnownHostEntry(line);
if (entry == null) {
continue;
}
if (entries == null) {
entries = new ArrayList<>();
}
entries.add(entry);
} catch (RuntimeException | Error e) { // TODO consider consulting a user callback
throw new StreamCorruptedException(
"Failed (" + e.getClass().getSimpleName() + ")" + " to parse line #" + lineNumber + " '" + line + "': "
+ e.getMessage());
}
}
if (entries == null) {
return Collections.emptyList();
} else {
return entries;
}
}
public static KnownHostEntry parseKnownHostEntry(String line) {
return parseKnownHostEntry(GenericUtils.isEmpty(line) ? null : new KnownHostEntry(), line);
}
public static E parseKnownHostEntry(E entry, String data) {
String line = GenericUtils.replaceWhitespaceAndTrim(data);
if (GenericUtils.isEmpty(line) || (line.charAt(0) == PublicKeyEntry.COMMENT_CHAR)) {
return entry;
}
entry.setConfigLine(line);
if (line.charAt(0) == MARKER_INDICATOR) {
int pos = line.indexOf(' ');
ValidateUtils.checkTrue(pos > 0, "Missing marker name end delimiter in line=%s", data);
ValidateUtils.checkTrue(pos > 1, "No marker name after indicator in line=%s", data);
entry.setMarker(line.substring(1, pos));
line = line.substring(pos + 1).trim();
} else {
entry.setMarker(null);
}
int pos = line.indexOf(' ');
ValidateUtils.checkTrue(pos > 0, "Missing host patterns end delimiter in line=%s", data);
String hostPattern = line.substring(0, pos);
line = line.substring(pos + 1).trim();
if (hostPattern.charAt(0) == KnownHostHashValue.HASHED_HOST_DELIMITER) {
KnownHostHashValue hash = ValidateUtils.checkNotNull(KnownHostHashValue.parse(hostPattern),
"Failed to extract host hash value from line=%s", data);
entry.setHashedEntry(hash);
entry.setPatterns(null);
} else {
entry.setHashedEntry(null);
entry.setPatterns(parsePatterns(GenericUtils.split(hostPattern, ',')));
}
AuthorizedKeyEntry key = ValidateUtils.checkNotNull(AuthorizedKeyEntry.parseAuthorizedKeyEntry(line),
"No valid key entry recovered from line=%s", data);
entry.setKeyEntry(key);
return entry;
}
}
