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Re: ssh Problem using it for SFTP



Hi, Steve.

On 14/01/16 13:10, Steve Matzura wrote:

> Failing connection:
> (...)
> no matching cipher found: client
> aes192-cbc,3des-cbc,blowfish-cbc,aes128-cbc,aes256-cbc,rijndael128-cbc,rijndael192-cbc,rijndael256-cbc,rijndael-cbc@lysator.liu.se,des-cbc,des-cbc@ssh.com
> server
> aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com

> The rest of the lines show connection run-down, omitted.

Hmmmm... Maybe you could fix this by allowing users to choose between
SHA1 and SHA2 hash functions.

Since the openssh-server version used in Jessie (and presumably the
upstreams of SSHD) now has diffie-hellman-group1-sha1 disabled, this
means that connections some clients could fail. A workaround would be to
add the following in /etc/ssh/sshd_config:

KexAlgorithms
curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1

But at some point I think the support for diffie-hellman-group1-sha1
completely disappear instead of being disabled by default.

I hope this helps.

Best regards,
Daniel

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