[X2Go-Dev] Bug#1373: Bug#1373: kex error : no match for method mac algo
Control: reassign -1 x2goclient Control: forcemerge #1374 -1 On Mo 18 Feb 2019 10:07:37 CET, Danie de Jager 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. [...] Doing some bts major domo work... Mike -- DAS-NETZWERKTEAM c\o Technik- und Ökologiezentrum Eckernförde Mike Gabriel, Marienthaler str. 17, 24340 Eckernförde mobile: +49 (1520) 1976 148 landline: +49 (4354) 8390 139 GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22 0782 9AF4 6B30 2577 1B31 mail: mike.gabr...@das-netzwerkteam.de, http://das-netzwerkteam.de pgpvgQr1QnZ2I.pgp Description: Digitale PGP-Signatur ___ x2go-dev mailing list x2go-dev@lists.x2go.org https://lists.x2go.org/listinfo/x2go-dev
[X2Go-Dev] Bug#1373: Bug#1373: kex error : no match for method mac algo
Thanks for your input. Maybe the client ships in a way where it is compiled to only support MACs of hmac-sha1-...@openssh.com,hmac-sha1 When I add these to my server I can SSH to it and see remote screen with X2GO client. If I change the server's SSHD config and remove the 2 sha1 MACs I can still shh to the server but X2Go client stops working. To get the libssh updated for my OS won't necissarily allow the client to use it if the client was statically compiled using an older version. On Mon, 18 Feb 2019 at 12:22, Antenore wrote: > Package: client > > 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 18 February 2019 10:07:37 CET, 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
[X2Go-Dev] Bug#1373: Bug#1373: kex error : no match for method mac algo
Package: client 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 18 February 2019 10:07:37 CET, Danie de Jager 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
