JSAGA

Hi Akos,
If you do not want the "KnownHosts" attribute, remove it from the context:

context.removeAttribute("KnownHosts");

Nothing has changed recently in the SSH adaptor code.

HTH
Lionel

Dear Lionel,

Sorry, I was not clear enough.

Here is my example that does not work:

import org.ogf.saga.context.*;
import org.ogf.saga.namespace.*;
import org.ogf.saga.session.*;
import org.ogf.saga.url.*;

public class Ssh {
    public static void main(String[] args) throws Exception {
        try {
            URL url = URLFactory.createURL("sftp://192.168.153.100");
            Session session = SessionFactory.createSession(false);
            Context ctx = ContextFactory.createContext("UserPass"); 
            ctx.setAttribute(Context.USERID, "root");
            ctx.setAttribute(Context.USERPASS, "***");
            //ctx.setAttribute("KnownHosts", "./myknown_hosts"); no effect
            session.addContext(ctx);
            NSDirectory dir = NSFactory.createNSDirectory(session, url);
            for (URL dirEntry: dir.list()) System.out.println(dirEntry.getPath());
            dir.close();
        } catch (Exception e) { e.printStackTrace(); }
    }
}

My default known_hosts file (C:\Documents and Settings\Akos Hajnal\.ssh\known_hosts) does not know the server 192.168.153.100, so I get the excption:

NoSuccess: Unable to connect to server
    at fr.in2p3.jsaga.adaptor.ssh.SSHAdaptorAbstract.connect(SSHAdaptorAbstract.java:166)
    at fr.in2p3.jsaga.adaptor.ssh.data.SFTPDataAdaptor.connect(SFTPDataAdaptor.java:58)
    at fr.in2p3.jsaga.engine.factories.DataAdaptorFactory.getDataAdaptorAndConnect(DataAdaptorFactory.java:101)
    at fr.in2p3.jsaga.impl.namespace.AbstractSyncNSFactoryImpl.doCreateNSDirectorySync(AbstractSyncNSFactoryImpl.java:61)
    at fr.in2p3.jsaga.impl.namespace.NSFactoryImpl.doCreateNSDirectory(NSFactoryImpl.java:48)
    at org.ogf.saga.namespace.NSFactory.createNSDirectory(NSFactory.java:667)
    at org.ogf.saga.namespace.NSFactory.createNSDirectory(NSFactory.java:606)
    at org.ogf.saga.namespace.NSFactory.createNSDirectory(NSFactory.java:722)
    at Ssh.main(Ssh.java:16)
Caused by: com.jcraft.jsch.JSchException: UnknownHostKey: 192.168.153.100. RSA key fingerprint is e1:0d:e1:2a:05:9c:ad:f8:52:4a:ca:08:ba:08:0c:c9
    at com.jcraft.jsch.Session.checkHost(Session.java:730)
    at com.jcraft.jsch.Session.connect(Session.java:317)
    at com.jcraft.jsch.Session.connect(Session.java:158)
    at fr.in2p3.jsaga.adaptor.ssh.SSHAdaptorAbstract.connect(SSHAdaptorAbstract.java:159)
    ... 8 more

Assume that I cannot change my known_hosts file, so I would like to switch off "StrictHostKeyChecking" to avoid this exception/checking. Is it possible somehow?

Thanks,
Akos Hajnal

Akos, if you do not want StrictHostKeyChecking, then you do not need any KnownHosts file. So remove the attribute from the context (it is set by default to the value ".ssh/known_hosts"):

ctx.removeAttribute("KnownHosts");

Lionel

I get exception for the code below:

DoesNotExist: Attribute KnownHosts does not exist
    at fr.in2p3.jsaga.impl.attributes.AbstractAttributesImpl.removeAttribute(AbstractAttributesImpl.java:118)
    at Ssh.main(Ssh.java:14)

            Context ctx = ContextFactory.createContext("UserPass"); 
            ctx.setAttribute(Context.USERID, "root");
            ctx.setAttribute(Context.USERPASS, "***");
            ctx.removeAttribute("KnownHosts");
            session.addContext(ctx);

Maybe I still missing something...

Akos

Sorry, the code shown in previous messages:

ctx.removeAttribute("KnownHosts");

does not work since "KnownHosts" is not an attribute of the security context, but an attribute of the data service associated with the context.

With the latest 0.9.16-SNAPSHOT, it is possible to disable the use of the known_hosts file with:

ctx.setVectorAttribute("DataServiceAttributes", new String[]{"sftp.KnownHosts="});

Lionel

Thanks, the new version works fine!

Akos