1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
// 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.client.Account;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.config.CanonicalWebUrl;
import com.google.gerrit.server.ssh.SshInfo;
import com.google.gerrit.sshd.SshScope.Context;
import com.google.inject.Inject;
import com.google.inject.Provider;
import org.apache.sshd.common.Factory;
import org.apache.sshd.server.Command;
import org.apache.sshd.server.Environment;
import org.apache.sshd.server.ExitCallback;
import org.apache.sshd.server.SessionAware;
import org.apache.sshd.server.session.ServerSession;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.util.SystemReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;
/**
* Dummy shell which prints a message and terminates.
* <p>
* This implementation is used to ensure clients who try to SSH directly to this
* server without supplying a command will get a reasonable error message, but
* cannot continue further.
*/
class NoShell implements Factory<Command> {
private final Provider<SendMessage> shell;
@Inject
NoShell(Provider<SendMessage> shell) {
this.shell = shell;
}
public Command create() {
return shell.get();
}
static class SendMessage implements Command, SessionAware {
private final Provider<MessageFactory> messageFactory;
private InputStream in;
private OutputStream out;
private OutputStream err;
private ExitCallback exit;
private Context context;
@Inject
SendMessage(Provider<MessageFactory> messageFactory) {
this.messageFactory = messageFactory;
}
public void setInputStream(final InputStream in) {
this.in = in;
}
public void setOutputStream(final OutputStream out) {
this.out = out;
}
public void setErrorStream(final OutputStream err) {
this.err = err;
}
public void setExitCallback(final ExitCallback callback) {
this.exit = callback;
}
public void setSession(final ServerSession session) {
this.context = new Context(session.getAttribute(SshSession.KEY), "");
}
public void start(final Environment env) throws IOException {
Context old = SshScope.set(context);
String message;
try {
message = messageFactory.get().getMessage();
} finally {
SshScope.set(old);
}
err.write(Constants.encode(message.toString()));
err.flush();
in.close();
out.close();
err.close();
exit.onExit(127);
}
public void destroy() {
}
}
static class MessageFactory {
private final IdentifiedUser user;
private final SshInfo sshInfo;
private final Provider<String> urlProvider;
@Inject
MessageFactory(IdentifiedUser user, SshInfo sshInfo,
@CanonicalWebUrl Provider<String> urlProvider) {
this.user = user;
this.sshInfo = sshInfo;
this.urlProvider = urlProvider;
}
String getMessage() {
StringBuilder msg = new StringBuilder();
msg.append("\r\n");
msg.append(" **** Welcome to Gerrit Code Review ****\r\n");
msg.append("\r\n");
Account account = user.getAccount();
String name = account.getFullName();
if (name == null || name.isEmpty()) {
name = user.getUserName();
}
msg.append(" Hi ");
msg.append(name);
msg.append(", you have successfully connected over SSH.");
msg.append("\r\n");
msg.append("\r\n");
msg.append(" Unfortunately, interactive shells are disabled.\r\n");
msg.append(" To clone a hosted Git repository, use:\r\n");
msg.append("\r\n");
if (!sshInfo.getHostKeys().isEmpty()) {
String host = sshInfo.getHostKeys().get(0).getHost();
if (host.startsWith("*:")) {
host = getGerritHost() + host.substring(1);
}
msg.append(" git clone ssh://");
msg.append(user.getUserName());
msg.append("@");
msg.append(host);
msg.append("/");
msg.append("REPOSITORY_NAME.git");
msg.append("\r\n");
}
msg.append("\r\n");
return msg.toString();
}
private String getGerritHost() {
String url = urlProvider.get();
if (url != null) {
try {
return new URL(url).getHost();
} catch (MalformedURLException e) {
}
}
return SystemReader.getInstance().getHostname();
}
}
}
|
