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From "David Kocher (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NET-408) problem connecting to ProFTPD with FTPES
Date Fri, 20 May 2011 12:10:47 GMT

    [ https://issues.apache.org/jira/browse/NET-408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13036791#comment-13036791
] 

David Kocher commented on NET-408:
----------------------------------

Does anyone here have an expertise how the caching per hostname and port in the SSL context
could be altered to provide interoperability with the requirement to use the same SSL session
for the data channel?

> problem connecting to ProFTPD with FTPES
> ----------------------------------------
>
>                 Key: NET-408
>                 URL: https://issues.apache.org/jira/browse/NET-408
>             Project: Commons Net
>          Issue Type: Bug
>          Components: FTP
>    Affects Versions: 2.2, 3.0
>         Environment: ProFTPD 1.3.3d on SUSE Linux Enterprise Server 10.1 32bit, Kernel
2.6.16.46-0.12-default (config file attached)
> ProFTPD 1.3.3d on OpenSUSE 64bit Linux 2.6.34.8-0.2-desktop
> Java 1.5
>            Reporter: Michael Voigt
>         Attachments: ftpes.jpg, proftpd.conf
>
>
> I have a problem with the FTPClient connecting to a ProFTPD server.
> If the server uses the configuration option "TLSProtocol TLSv1", I
> cannot connect to it at all. I recieve the following error message:
> - javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection
> On the server side I see in the log:
> unable to accept TLS connection: protocol error:
> -  (1) error:14094416:SSL routines:SSL3_READ_BYTES:sslv3 alert
> certificate unknown
> - TLS/TLS-C negotiation failed on control channel
> If the server uses the configuration option "TLSProtocol SSLv23", I
> can connect to it but I cant transfer any files. In the server log I
> see:
> - starting TLS negotiation on data connection
> - TLSv1/SSLv3 renegotiation accepted, using cipher RC4-MD5 (128 bits)
> - client did not reuse SSL session, rejecting data connection (see
> TLSOption NoSessionReuseRequired)
> - unable to open data connection: TLS negotiation failed
> If I add the NoSessionReuseRequired parameter to the ProFTPD config
> everything works fine.
> Here is my code:
>                FTPClient ftpClient = new FTPClient();
>                ftpClient = new FTPSClient("TLS");
>                // this throws an exception with TLSProtocol TLSv1
>                ftpClient.connect(host, port);
>                int reply = ftpClient.getReplyCode();
>                if (!FTPReply.isPositiveCompletion(reply)) {
>                        ftpClient.disconnect();
>                        log.error("The FTP Server did not return a positive completion
reply!");
>                        throw new FtpTransferException(ECCUtils.ERROR_FTP_CONNECTION);
>                }
>                boolean loginSuccessful = ftpClient.login(userName, password);
>                if (!loginSuccessful) {
>                        log.error("Login to the FTP Server failed! The credentials are
not valid.");
>                        throw new FtpTransferException(ECCUtils.ERROR_FTP_LOGIN);
>                }
>                ftpClient.execPBSZ(0);
>                ftpClient.execPROT("P");
>                boolean success = ftpClient.storeFile(fileName, fis);
>                if (!success) {
>                        // this is false if "NoSessionReuseRequired" is not set
>                }
> Now my question is if it is generally possible to connect to a server
> with "TLSProtocol TLSv1" or "TLSProtocol SSLv23" without the
> "NoSessionReuseRequired" parameter? Could someone provide a piece of
> example code for this?

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