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/*
* Copyright (C) 2018, Thomas Wolf <thomas.wolf@paranor.ch> and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.internal.transport.sshd;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.text.MessageFormat.format;
import static org.apache.sshd.client.config.hosts.HostPatternsHolder.NON_STANDARD_PORT_PATTERN_ENCLOSURE_END_DELIM;
import static org.apache.sshd.client.config.hosts.HostPatternsHolder.NON_STANDARD_PORT_PATTERN_ENCLOSURE_START_DELIM;
import java.io.BufferedReader;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;
import org.apache.sshd.client.config.hosts.HostPatternValue;
import org.apache.sshd.client.config.hosts.HostPatternsHolder;
import org.apache.sshd.client.config.hosts.KnownHostEntry;
import org.apache.sshd.client.config.hosts.KnownHostHashValue;
import org.apache.sshd.common.config.keys.AuthorizedKeyEntry;
import org.apache.sshd.common.config.keys.PublicKeyEntry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Apache MINA sshd 2.0.0 KnownHostEntry cannot read a host entry line like
* "host:port ssh-rsa <key>"; it complains about an illegal character in
* the host name (correct would be "[host]:port"). The default known_hosts
* reader also aborts reading on the first error.
* <p>
* This reader is a bit more robust and tries to handle this case if there is
* only one colon (otherwise it might be an IPv6 address (without port)), and it
* skips and logs invalid entries, but still returns all other valid entries
* from the file.
* </p>
*/
public class KnownHostEntryReader {
private static final Logger LOG = LoggerFactory
.getLogger(KnownHostEntryReader.class);
private KnownHostEntryReader() {
// No instantiation
}
/**
* Reads a known_hosts file and returns all valid entries. Invalid entries
* are skipped (and a message is logged).
*
* @param path
* of the file to read
* @return a {@link List} of all valid entries read from the file
* @throws IOException
* if the file cannot be read.
*/
public static List<KnownHostEntry> readFromFile(Path path)
throws IOException {
List<KnownHostEntry> result = new ArrayList<>();
try (BufferedReader r = Files.newBufferedReader(path, UTF_8)) {
r.lines().forEachOrdered(l -> {
if (l == null) {
return;
}
String line = clean(l);
if (line.isEmpty()) {
return;
}
try {
KnownHostEntry entry = parseHostEntry(line);
if (entry != null) {
result.add(entry);
} else {
LOG.warn(format(SshdText.get().knownHostsInvalidLine,
path, line));
}
} catch (RuntimeException e) {
LOG.warn(format(SshdText.get().knownHostsInvalidLine, path,
line), e);
}
});
}
return result;
}
private static String clean(String line) {
int i = line.indexOf('#');
return i < 0 ? line.trim() : line.substring(0, i).trim();
}
static KnownHostEntry parseHostEntry(String line) {
KnownHostEntry entry = new KnownHostEntry();
entry.setConfigLine(line);
String tmp = line;
int i = 0;
if (tmp.charAt(0) == KnownHostEntry.MARKER_INDICATOR) {
// A marker
i = tmp.indexOf(' ', 1);
if (i < 0) {
return null;
}
entry.setMarker(tmp.substring(1, i));
tmp = tmp.substring(i + 1).trim();
}
i = tmp.indexOf(' ');
if (i < 0) {
return null;
}
// Hash, or host patterns
if (tmp.charAt(0) == KnownHostHashValue.HASHED_HOST_DELIMITER) {
// Hashed host entry
KnownHostHashValue hash = KnownHostHashValue
.parse(tmp.substring(0, i));
if (hash == null) {
return null;
}
entry.setHashedEntry(hash);
entry.setPatterns(null);
} else {
Collection<HostPatternValue> patterns = parsePatterns(
tmp.substring(0, i));
if (patterns == null || patterns.isEmpty()) {
return null;
}
entry.setHashedEntry(null);
entry.setPatterns(patterns);
}
tmp = tmp.substring(i + 1).trim();
AuthorizedKeyEntry key = PublicKeyEntry
.parsePublicKeyEntry(new AuthorizedKeyEntry(), tmp);
if (key == null) {
return null;
}
entry.setKeyEntry(key);
return entry;
}
private static Collection<HostPatternValue> parsePatterns(String text) {
if (text.isEmpty()) {
return null;
}
List<String> items = Arrays.stream(text.split(",")) //$NON-NLS-1$
.filter(item -> item != null && !item.isEmpty()).map(item -> {
if (NON_STANDARD_PORT_PATTERN_ENCLOSURE_START_DELIM == item
.charAt(0)) {
return item;
}
int firstColon = item.indexOf(':');
if (firstColon < 0) {
return item;
}
int secondColon = item.indexOf(':', firstColon + 1);
if (secondColon > 0) {
// Assume an IPv6 address (without port).
return item;
}
// We have "host:port", should be "[host]:port"
return NON_STANDARD_PORT_PATTERN_ENCLOSURE_START_DELIM
+ item.substring(0, firstColon)
+ NON_STANDARD_PORT_PATTERN_ENCLOSURE_END_DELIM
+ item.substring(firstColon);
}).collect(Collectors.toList());
return items.isEmpty() ? null : HostPatternsHolder.parsePatterns(items);
}
}
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