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https://issues.apache.org/jira/browse/NET-408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16929015#comment-16929015
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Matthias Perktold commented on NET-408:
---------------------------------------
Is there any progress on this?
I am currently using a workaround suggested on Stackoverflow, which is a copy
of cyberduck's code:
[https://stackoverflow.com/a/32404418]
Additionally, on JDK 8u161 or higher, the following System property is required:
{code:java}
System.setProperty("jdk.tls.useExtendedMasterSecret", "false");
{code}
Also, when running on JDK 11, I get the following console output:
{code:java}
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by FTPSClientWithSessionResumption to field
sun.security.ssl.SSLSessionContextImpl.sessionHostPortCache
WARNING: Please consider reporting this to the maintainers of
FTPSClientWithSessionResumption
WARNING: Use --illegal-access=warn to enable warnings of further illegal
reflective access operations
WARNING: All illegal access operations will be denied in a future release
{code}
Which makes it pretty clear that this cannot be a long term solution.
> 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
> Priority: Major
> Attachments: BCFTPSClient.java, FTPSClientWithTLSResumption.zip,
> PTFTPSClient.java, 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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