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/*
* Copyright 2014 gitblit.com.
*
* Licensed 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 com.gitblit.transport.ssh;
import java.io.File;
import java.io.IOException;
import java.security.PublicKey;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.codec.binary.Base64;
import org.apache.sshd.common.util.Buffer;
import org.eclipse.jgit.lib.Constants;
import com.gitblit.Keys;
import com.gitblit.manager.IRuntimeManager;
import com.google.common.base.Charsets;
import com.google.common.base.Joiner;
import com.google.common.io.Files;
/**
* Manages SSH keys on the filesystem.
*
* @author James Moger
*
*/
public class FileKeyManager implements IKeyManager {
protected final IRuntimeManager runtimeManager;
public FileKeyManager(IRuntimeManager runtimeManager) {
this.runtimeManager = runtimeManager;
}
@Override
public String toString() {
File dir = runtimeManager.getFileOrFolder(Keys.git.sshKeysFolder, "${baseFolder}/ssh");
return MessageFormat.format("{0} ({1})", getClass().getSimpleName(), dir);
}
@Override
public FileKeyManager start() {
return this;
}
@Override
public boolean isReady() {
return true;
}
@Override
public FileKeyManager stop() {
return this;
}
@Override
public List<PublicKey> getKeys(String username) {
try {
File keys = getKeystore(username);
if (!keys.exists()) {
return null;
}
if (keys.exists()) {
List<PublicKey> list = new ArrayList<PublicKey>();
for (String entry : Files.readLines(keys, Charsets.ISO_8859_1)) {
if (entry.trim().length() == 0) {
// skip blanks
continue;
}
if (entry.charAt(0) == '#') {
// skip comments
continue;
}
final String[] parts = entry.split(" ");
final byte[] bin = Base64.decodeBase64(Constants.encodeASCII(parts[1]));
list.add(new Buffer(bin).getRawPublicKey());
}
if (list.isEmpty()) {
return null;
}
return list;
}
} catch (IOException e) {
throw new RuntimeException("Canot read ssh keys", e);
}
return null;
}
/**
* Adds a unique key to the keystore. This function determines uniqueness
* by disregarding the comment/description field during key comparisons.
*/
@Override
public boolean addKey(String username, String data) {
try {
String newKey = stripCommentFromKey(data);
List<String> lines = new ArrayList<String>();
File keystore = getKeystore(username);
if (keystore.exists()) {
for (String entry : Files.readLines(keystore, Charsets.ISO_8859_1)) {
String line = entry.trim();
if (line.length() == 0) {
// keep blanks
lines.add(entry);
continue;
}
if (line.charAt(0) == '#') {
// keep comments
lines.add(entry);
continue;
}
// only add keys that do not match the new key
String oldKey = stripCommentFromKey(line);
if (!newKey.equals(oldKey)) {
lines.add(entry);
}
}
}
// add new key
lines.add(data);
// write keystore
String content = Joiner.on("\n").join(lines).trim().concat("\n");
Files.write(content, keystore, Charsets.ISO_8859_1);
return true;
} catch (IOException e) {
throw new RuntimeException("Cannot add ssh key", e);
}
}
/**
* Removes a key from the keystore.
*/
@Override
public boolean removeKey(String username, String data) {
try {
String rmKey = stripCommentFromKey(data);
File keystore = getKeystore(username);
if (keystore.exists()) {
List<String> lines = new ArrayList<String>();
for (String entry : Files.readLines(keystore, Charsets.ISO_8859_1)) {
String line = entry.trim();
if (line.length() == 0) {
// keep blanks
lines.add(entry);
continue;
}
if (line.charAt(0) == '#') {
// keep comments
lines.add(entry);
continue;
}
// only include keys that are NOT rmKey
String oldKey = stripCommentFromKey(line);
if (!rmKey.equals(oldKey)) {
lines.add(entry);
}
}
if (lines.isEmpty()) {
keystore.delete();
} else {
// write keystore
String content = Joiner.on("\n").join(lines).trim().concat("\n");
Files.write(content, keystore, Charsets.ISO_8859_1);
}
return true;
}
} catch (IOException e) {
throw new RuntimeException("Cannot remove ssh key", e);
}
return false;
}
@Override
public boolean removeAllKeys(String username) {
return getKeystore(username).delete();
}
protected File getKeystore(String username) {
File dir = runtimeManager.getFileOrFolder(Keys.git.sshKeysFolder, "${baseFolder}/ssh");
dir.mkdirs();
File keys = new File(dir, username + ".keys");
return keys;
}
/* Strips the comment from the key data and eliminates whitespace diffs */
protected String stripCommentFromKey(String data) {
String [] cols = data.split(" ");
String key = Joiner.on(" ").join(cols[0], cols[1]);
return key;
}
}
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