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/*
* Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
* Please refer to the LICENSE.txt for licensing details.
*/
import ch.ethz.ssh2.KnownHosts;
import ch.ethz.ssh2.ServerHostKeyVerifier;
class SimpleVerifier implements ServerHostKeyVerifier
{
KnownHosts database;
/*
* This class is being used by the UsingKnownHosts.java example.
*/
public SimpleVerifier(KnownHosts database)
{
if (database == null)
throw new IllegalArgumentException();
this.database = database;
}
public boolean verifyServerHostKey(String hostname, int port, String serverHostKeyAlgorithm, byte[] serverHostKey)
throws Exception
{
int result = database.verifyHostkey(hostname, serverHostKeyAlgorithm, serverHostKey);
switch (result)
{
case KnownHosts.HOSTKEY_IS_OK:
return true; // We are happy
case KnownHosts.HOSTKEY_IS_NEW:
// Unknown host? Blindly accept the key and put it into the cache.
// Well, you definitely can do better (e.g., ask the user).
// The following call will ONLY put the key into the memory cache!
// To save it in a known hosts file, also call "KnownHosts.addHostkeyToFile(...)"
database.addHostkey(new String[] { hostname }, serverHostKeyAlgorithm, serverHostKey);
return true;
case KnownHosts.HOSTKEY_HAS_CHANGED:
// Close the connection if the hostkey has changed.
// Better: ask user and add new key to database.
return false;
default:
throw new IllegalStateException();
}
}
}
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