/*
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* Copyright 2014 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.gitblit.transport.ssh;
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import java.io.File;
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import java.io.IOException;
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import java.security.PublicKey;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Locale;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.TimeUnit;
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import org.apache.commons.codec.binary.Base64;
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import org.apache.sshd.common.util.Buffer;
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import org.apache.sshd.server.PublickeyAuthenticator;
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import org.apache.sshd.server.session.ServerSession;
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import org.eclipse.jgit.lib.Constants;
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import com.gitblit.Keys;
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import com.gitblit.manager.IGitblit;
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import com.gitblit.models.UserModel;
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import com.google.common.base.Charsets;
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import com.google.common.cache.CacheBuilder;
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import com.google.common.cache.CacheLoader;
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import com.google.common.cache.LoadingCache;
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import com.google.common.io.Files;
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/**
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*
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* @author Eric Myrhe
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*
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*/
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public class SshKeyAuthenticator implements PublickeyAuthenticator {
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protected final IGitblit gitblit;
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LoadingCache<String, List<PublicKey>> sshKeyCache = CacheBuilder
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.newBuilder().
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expireAfterAccess(15, TimeUnit.MINUTES).
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maximumSize(100)
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.build(new CacheLoader<String, List<PublicKey>>() {
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public List<PublicKey> load(String username) {
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try {
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File dir = gitblit.getFileOrFolder(Keys.git.sshKeysFolder, "${baseFolder}/ssh");
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dir.mkdirs();
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File keys = new File(dir, username + ".keys");
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if (!keys.exists()) {
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return null;
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}
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if (keys.exists()) {
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String str = Files.toString(keys, Charsets.ISO_8859_1);
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String [] entries = str.split("\n");
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List<PublicKey> list = new ArrayList<PublicKey>();
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for (String entry : entries) {
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final String[] parts = entry.split(" ");
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final byte[] bin = Base64.decodeBase64(Constants.encodeASCII(parts[1]));
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list.add(new Buffer(bin).getRawPublicKey());
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}
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if (list.isEmpty()) {
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return null;
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}
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return list;
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}
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} catch (IOException e) {
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throw new RuntimeException("Canot read public key", e);
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}
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return null;
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}
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});
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public SshKeyAuthenticator(IGitblit gitblit) {
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this.gitblit = gitblit;
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}
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@Override
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public boolean authenticate(String username, final PublicKey suppliedKey,
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final ServerSession session) {
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final SshSession sd = session.getAttribute(SshSession.KEY);
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username = username.toLowerCase(Locale.US);
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try {
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List<PublicKey> keys = sshKeyCache.get(username);
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if (keys == null || keys.isEmpty()) {
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sd.authenticationError(username, "no-matching-key");
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return false;
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}
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for (PublicKey key : keys) {
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if (key.equals(suppliedKey)) {
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return validate(username, sd);
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}
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}
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return false;
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} catch (ExecutionException e) {
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sd.authenticationError(username, "user-not-found");
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return false;
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}
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}
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boolean validate(String username, SshSession sd) {
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// now that the key has been validated, check with the authentication
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// manager to ensure that this user exists and can authenticate
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sd.authenticationSuccess(username);
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UserModel user = gitblit.authenticate(sd);
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if (user != null) {
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return true;
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}
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sd.authenticationError(username, "user-not-found");
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return false;
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}
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}
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