| // Copyright (C) 2008 The Android Open Source Project |
| // |
| // 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.google.gerrit.sshd; |
| |
| import com.google.gerrit.reviewdb.AccountSshKey; |
| import com.google.gerrit.reviewdb.ReviewDb; |
| import com.google.gwtorm.client.SchemaFactory; |
| import com.google.inject.Inject; |
| import com.google.inject.Singleton; |
| |
| import org.apache.sshd.server.PublickeyAuthenticator; |
| import org.apache.sshd.server.session.ServerSession; |
| |
| import java.security.PublicKey; |
| |
| /** |
| * Authenticates by public key through {@link AccountSshKey} entities. |
| * <p> |
| * The username supplied by the client must be the user's preferred email |
| * address, as listed in their Account entity. Only keys listed under that |
| * account as authorized keys are permitted to access the account. |
| */ |
| @Singleton |
| class DatabasePubKeyAuth implements PublickeyAuthenticator { |
| private final SshKeyCacheImpl sshKeyCache; |
| private final SchemaFactory<ReviewDb> schema; |
| |
| @Inject |
| DatabasePubKeyAuth(final SshKeyCacheImpl skc, final SchemaFactory<ReviewDb> sf) { |
| sshKeyCache = skc; |
| schema = sf; |
| } |
| |
| public boolean authenticate(final String username, |
| final PublicKey suppliedKey, final ServerSession session) { |
| final Iterable<SshKeyCacheEntry> keyList = sshKeyCache.get(username); |
| final SshKeyCacheEntry key = find(keyList, suppliedKey); |
| if (key == null) { |
| return false; |
| } |
| |
| // Double check that all of the keys are for the same user account. |
| // This should have been true when the cache factory method loaded |
| // the list into memory, but we want to be extra paranoid about our |
| // security check to ensure there aren't two users sharing the same |
| // user name on the server. |
| // |
| for (final SshKeyCacheEntry otherKey : keyList) { |
| if (!key.getAccount().equals(otherKey.getAccount())) { |
| return false; |
| } |
| } |
| |
| key.updateLastUsed(schema); |
| session.setAttribute(SshUtil.CURRENT_ACCOUNT, key.getAccount()); |
| return true; |
| } |
| |
| private SshKeyCacheEntry find(final Iterable<SshKeyCacheEntry> keyList, |
| final PublicKey suppliedKey) { |
| for (final SshKeyCacheEntry k : keyList) { |
| if (k.match(suppliedKey)) { |
| return k; |
| } |
| } |
| return null; |
| } |
| } |