[ https://issues.apache.org/jira/browse/GUACAMOLE-1619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mike Jumper closed GUACAMOLE-1619. ---------------------------------- Resolution: Invalid > SSH Server > 8.5 - Guacamole > ---------------------------- > > Key: GUACAMOLE-1619 > URL: https://issues.apache.org/jira/browse/GUACAMOLE-1619 > Project: Guacamole > Issue Type: Bug > Components: guacamole > Affects Versions: 1.4.0 > Environment: Ubuntu LTS 22.04 / Docker with latest guacamole image > Reporter: Kenneth D'hoe > Priority: Major > > Not able to SSH to ubuntu 22.04 LTS host from latest dockerized guacamole. > On the remote server i receive the error: Unable to negotiate with > xx.xx.xx.xx port 44138: no matching host key type found. Their offer: > ssh-rsa,ssh-dss [preauth] > SSH Version on remote host: user@hostname:~# ssh -V > OpenSSH_8.9p1 Ubuntu-3, OpenSSL 3.0.2 15 Mar 2022 > Looks like guacamole is not able to use newer key algorithms ? > > Workarround: > Add below to sshd config. > {{HostKeyAlgorithms=ssh-rsa,ssh-rsa-cert-...@openssh.com > PubkeyAcceptedAlgorithms=+ssh-rsa,ssh-rsa-cert-...@openssh.com}} > > Disclaimer: > Warning! As mentioned in the OpenSSH man, enable the old rsa-sha1 algorithm > has a risk. rsa-sha1 is now being classified as breached since it costs less > then 50K to calculate a collision hash. > > Debug Log: > {code:java} > Jun 3 09:36:49 hostname sshd[1053815]: debug1: Forked child 1054212. > Jun 3 09:36:49 hostname sshd[1054212]: debug1: Set /proc/self/oom_score_adj > to 0 > Jun 3 09:36:49 hostname sshd[1054212]: debug1: rexec start in 5 out 5 > newsock 5 pipe 7 sock 8 > Jun 3 09:36:49 hostname sshd[1054212]: debug1: inetd sockets after dupping: > 4, 4 > Jun 3 09:36:49 hostname sshd[1054212]: Connection from 172.23.0.2 port 44142 > on 172.31.15.16 port 22 rdomain "" > Jun 3 09:36:49 hostname sshd[1054212]: debug1: Local version string > SSH-2.0-OpenSSH_8.9p1 Ubuntu-3 > Jun 3 09:36:49 hostname sshd[1054212]: debug1: Remote protocol version 2.0, > remote software version libssh2_1.8.0 > Jun 3 09:36:49 hostname sshd[1054212]: debug1: compat_banner: no match: > libssh2_1.8.0 > Jun 3 09:36:49 hostname sshd[1054212]: debug1: permanently_set_uid: > 106/65534 [preauth] > Jun 3 09:36:49 hostname sshd[1054212]: debug1: list_hostkey_types: > rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519 [preauth] > Jun 3 09:36:49 hostname sshd[1054212]: debug1: SSH2_MSG_KEXINIT sent > [preauth] > Jun 3 09:36:49 hostname sshd[1054212]: debug1: SSH2_MSG_KEXINIT received > [preauth] > Jun 3 09:36:49 hostname sshd[1054212]: debug1: kex: algorithm: > diffie-hellman-group-exchange-sha256 [preauth] > Jun 3 09:36:49 hostname sshd[1054212]: debug1: kex: host key algorithm: (no > match) [preauth] > Jun 3 09:36:49 hostname sshd[1054212]: Unable to negotiate with 172.23.0.2 > port 44142: no matching host key type found. Their offer: ssh-rsa,ssh-dss > [preauth] > Jun 3 09:36:49 hostname sshd[1054212]: debug1: do_cleanup [preauth] > Jun 3 09:36:49 hostname sshd[1054212]: debug1: monitor_read_log: child log > fd closed > Jun 3 09:36:49 hostname sshd[1054212]: debug1: do_cleanup > Jun 3 09:36:49 hostname sshd[1054212]: debug1: Killing privsep child 1054213 > Jun 3 09:36:49 hostname sshd[1054212]: debug1: audit_event: unhandled event > 12{code} -- This message was sent by Atlassian Jira (v8.20.7#820007)