/
KnownHostsFileKeyVerificationStrategy.java
106 lines (86 loc) · 4.01 KB
/
KnownHostsFileKeyVerificationStrategy.java
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
/*
* The MIT License
*
* Copyright (c) 2016, Michael Clarke
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package hudson.plugins.sshslaves.verifiers;
import java.io.File;
import java.io.IOException;
import hudson.slaves.ComputerLauncher;
import org.kohsuke.stapler.DataBoundConstructor;
import com.trilead.ssh2.KnownHosts;
import hudson.Extension;
import hudson.model.TaskListener;
import hudson.plugins.sshslaves.Messages;
import hudson.plugins.sshslaves.SSHLauncher;
import hudson.slaves.SlaveComputer;
/**
* A verifier that reads host keys from the Jenkins users' SSH known_hosts file.
*
* @author Michael Clarke
* @since 1.13
*/
public class KnownHostsFileKeyVerificationStrategy extends SshHostKeyVerificationStrategy {
private static final File KNOWN_HOSTS_FILE = new File(new File(new File(System.getProperty("user.home")), ".ssh"), "known_hosts");
@DataBoundConstructor
public KnownHostsFileKeyVerificationStrategy() {
super();
}
@Override
public boolean verify(SlaveComputer computer, HostKey hostKey, TaskListener listener) throws Exception {
ComputerLauncher launcher = computer.getLauncher();
if (!(launcher instanceof SSHLauncher)) {
return false;
}
if (!KNOWN_HOSTS_FILE.exists()) {
listener.getLogger().println(Messages.KnownHostsFileHostKeyVerifier_NoKnownHostsFile(KNOWN_HOSTS_FILE.getAbsolutePath()));
return false;
}
KnownHosts knownHosts = new KnownHosts(KNOWN_HOSTS_FILE);
int result = knownHosts.verifyHostkey(((SSHLauncher)launcher).getHost(), hostKey.getAlgorithm(), hostKey.getKey());
if (KnownHosts.HOSTKEY_IS_OK == result) {
listener.getLogger().println(Messages.KnownHostsFileHostKeyVerifier_KeyTrused(SSHLauncher.getTimestamp()));
return true;
} else if (KnownHosts.HOSTKEY_IS_NEW == result) {
listener.getLogger().println(Messages.KnownHostsFileHostKeyVerifier_NewKeyNotTrusted(SSHLauncher.getTimestamp()));
return false;
} else {
listener.getLogger().println(Messages.KnownHostsFileHostKeyVerifier_ChangedKeyNotTrusted(SSHLauncher.getTimestamp()));
return false;
}
}
@Override
public String[] getPreferredKeyAlgorithms(SlaveComputer computer) throws IOException {
ComputerLauncher launcher = computer.getLauncher();
if (!(launcher instanceof SSHLauncher) || !KNOWN_HOSTS_FILE.exists()) {
return super.getPreferredKeyAlgorithms(computer);
}
KnownHosts knownHosts = new KnownHosts(KNOWN_HOSTS_FILE);
return knownHosts.getPreferredServerHostkeyAlgorithmOrder(((SSHLauncher) launcher).getHost());
}
@Extension
public static class KnownHostsFileKeyVerificationStrategyDescriptor extends SshHostKeyVerificationStrategyDescriptor {
@Override
public String getDisplayName() {
return Messages.KnownHostsFileHostKeyVerifier_DisplayName();
}
}
}