Hi Daniel, I'm just a reader, but X2GO uses libssh, that support the Kex you are using, so first of all, you have to install an updated version of libssh and eventually check if it has been compiled with the support of these algorithms.
Normally, I think, on the X2GO side there is nothing more to do. Have a look here: https://www.libssh.org/features/ On Mon, 18 Feb 2019 11:07:37 +0200 Danie de Jager <danie.deja...@striata.com> wrote: > Package: client > > The client does not support chacha20 as I get this error when I try to > connect to the X2Go server. I did harden my SSH configuration as > guided by Mozzila > https://infosec.mozilla.org/guidelines/openssh > > When I use defaults it works fine. It seems that the library used by > X2Go is missing some newer methods. > > Config: > server ssh config: > KexAlgorithms curve25519-sha...@libssh.org > ,ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256 > Ciphers chacha20-poly1...@openssh.com,aes256-...@openssh.com, > aes128-...@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr > MACs hmac-sha2-512-...@openssh.com,hmac-sha2-256-...@openssh.com, > umac-128-...@openssh.com,hmac-sha2-512,hmac-sha2-256,umac-...@openssh.com > > Client sshd config: > Client using default sshd config > > or > > HashKnownHosts yes > HostKeyAlgorithms ssh-ed25519-cert-...@openssh.com, > ssh-rsa-cert-...@openssh.com,ssh-ed25519,ssh-rsa, > ecdsa-sha2-nistp521-cert-...@openssh.com, > ecdsa-sha2-nistp384-cert-...@openssh.com, > ecdsa-sha2-nistp256-cert-...@openssh.com > ,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256 > KexAlgorithms curve25519-sha...@libssh.org > ,ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256 > MACs hmac-sha2-512-...@openssh.com,hmac-sha2-256-...@openssh.com, > umac-128-...@openssh.com,hmac-sha2-512,hmac-sha2-256,umac-...@openssh.com > Ciphers chacha20-poly1...@openssh.com,aes256-...@openssh.com, > aes128-...@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr > > Error: > "kex error : no match for method mac algo client->server: server [ > hmac-sha2-512-...@openssh.com,hmac-sha2-256-...@openssh.com, > umac-128-...@openssh.com,hmac-sha2-512,hmac-sha2-256,umac-...@openssh.com], > client [hmac-sha1]" > > or sometimes > > "crypt_set_algorithms2: no crypto algorithm function found for > chacha20-poly1...@openssh.com" > > Let me know if I can provide more information. > > Regards, > *Danie de Jager* _______________________________________________ x2go-dev mailing list x2go-dev@lists.x2go.org https://lists.x2go.org/listinfo/x2go-dev
