Andreas Bergander created SSHD-771:
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Summary: 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
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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