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From "Goldstein Lyor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SSHD-771) SFTP server closes the connection when hmac-sha2-512 is used
Date Tue, 12 Sep 2017 05:43:00 GMT

    [ https://issues.apache.org/jira/browse/SSHD-771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16162527#comment-16162527
] 

Goldstein Lyor commented on SSHD-771:
-------------------------------------

Off-by-one value introduced in commit [e0041fc60281b11037384abb79c3a94ef8bf8c5e|https://github.com/apache/mina-sshd/commit/e0041fc60281b11037384abb79c3a94ef8bf8c5e]

> SFTP server closes the connection when hmac-sha2-512 is used
> ------------------------------------------------------------
>
>                 Key: SSHD-771
>                 URL: https://issues.apache.org/jira/browse/SSHD-771
>             Project: MINA SSHD
>          Issue Type: Bug
>    Affects Versions: 1.6.0
>            Reporter: Andreas Bergander
>            Assignee: Goldstein Lyor
>         Attachments: SshdTest.java
>
>
> It seems like the SFTP server in sshd does not handle HMAC SHA-2-512 very well. If I
set up a server which only accepts that HMAC, the server closes the connection as soon as
I connect with a client.
> The server throws an exception in AbstractSession (row 1380) before closing the connection:
> {code}
> // Check the computed result with the received mac (just after the packet data)
> if (!BufferUtils.equals(inMacResult, 0, data, decoderLength + 4, macSize)) {
>   throw new SshException(SshConstants.SSH2_DISCONNECT_MAC_ERROR, "MAC Error");
> }
> {code}
> If I switch the HMAC to SHA-2-256 everything works ok.
> I've attached a sample program which sets up a server. I've tested with a couple of different
clients and all of them exposes the error in the server.



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