1 /*
2 * Copyright (C) 2018, Thomas Wolf <thomas.wolf@paranor.ch>
3 * and other copyright owners as documented in the project's IP log.
4 *
5 * This program and the accompanying materials are made available
6 * under the terms of the Eclipse Distribution License v1.0 which
7 * accompanies this distribution, is reproduced below, and is
8 * available at http://www.eclipse.org/org/documents/edl-v10.php
9 *
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials provided
22 * with the distribution.
23 *
24 * - Neither the name of the Eclipse Foundation, Inc. nor the
25 * names of its contributors may be used to endorse or promote
26 * products derived from this software without specific prior
27 * written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
30 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
31 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
34 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
37 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
38 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
41 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 */
43 package org.eclipse.jgit.internal.transport.sshd;
44
45 import java.util.concurrent.CancellationException;
46
47 import org.apache.sshd.client.ClientAuthenticationManager;
48 import org.apache.sshd.client.auth.keyboard.UserInteraction;
49 import org.apache.sshd.client.auth.password.UserAuthPassword;
50 import org.apache.sshd.client.session.ClientSession;
51
52 /**
53 * A password authentication handler that uses the {@link JGitUserInteraction}
54 * to ask the user for the password. It also respects the
55 * {@code NumberOfPasswordPrompts} ssh config.
56 */
57 public class JGitPasswordAuthentication extends UserAuthPassword {
58
59 private int maxAttempts;
60
61 private int attempts;
62
63 @Override
64 public void init(ClientSession session, String service) throws Exception {
65 super.init(session, service);
66 maxAttempts = Math.max(1,
67 session.getIntProperty(
68 ClientAuthenticationManager.PASSWORD_PROMPTS,
69 ClientAuthenticationManager.DEFAULT_PASSWORD_PROMPTS));
70 attempts = 0;
71 }
72
73 @Override
74 protected boolean sendAuthDataRequest(ClientSession session, String service)
75 throws Exception {
76 if (++attempts > maxAttempts) {
77 return false;
78 }
79 UserInteraction interaction = session.getUserInteraction();
80 if (!interaction.isInteractionAllowed(session)) {
81 return false;
82 }
83 String password = getPassword(session, interaction);
84 if (password == null) {
85 throw new CancellationException();
86 }
87 // sendPassword takes a buffer as first argument, but actually doesn't
88 // use it and creates its own buffer...
89 sendPassword(null, session, password, password);
90 return true;
91 }
92
93 private String getPassword(ClientSession session,
94 UserInteraction interaction) {
95 String[] results = interaction.interactive(session, null, null, "", //$NON-NLS-1$
96 new String[] { SshdText.get().passwordPrompt },
97 new boolean[] { false });
98 return (results == null || results.length == 0) ? null : results[0];
99 }
100 }