Thanks for the PPA! I currently don't have an impish system at hand, would it be possible to build it for focal as well?
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to openssh in Ubuntu. https://bugs.launchpad.net/bugs/1938144 Title: monitor_read: unpermitted request 48 on server while attempting GSSAPI key exchange Status in portable OpenSSH: Unknown Status in openssh package in Ubuntu: Triaged Bug description: I'm using openssh 1:8.2p1-4ubuntu0.2 on Ubuntu 20.04.2 LTS (client and server) with the option "GSSAPIKeyExchange=yes", and this causes the connection to fail. The server has GSSAPI (Kerberos authentication) enabled, but is is only used for non-root users (root uses SSH keys). Client command: ssh -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex root@server -v -p 2222 -o GSSAPIKeyExchange=yes Client log: OpenSSH_8.2p1 Ubuntu-4ubuntu0.2, OpenSSL 1.1.1f 31 Mar 2020 debug1: Reading configuration data /home/user/.ssh/config debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files debug1: /etc/ssh/ssh_config line 21: Applying options for * debug1: Connecting to compute-test [130.75.80.46] port 2222. debug1: Connection established. debug1: identity file /home/rother/.ssh/id_rsa type 0 debug1: identity file /home/rother/.ssh/id_rsa-cert type -1 debug1: identity file /home/rother/.ssh/id_dsa type -1 debug1: identity file /home/rother/.ssh/id_dsa-cert type -1 debug1: identity file /home/rother/.ssh/id_ecdsa type -1 debug1: identity file /home/rother/.ssh/id_ecdsa-cert type -1 debug1: identity file /home/rother/.ssh/id_ecdsa_sk type -1 debug1: identity file /home/rother/.ssh/id_ecdsa_sk-cert type -1 debug1: identity file /home/rother/.ssh/id_ed25519 type -1 debug1: identity file /home/rother/.ssh/id_ed25519-cert type -1 debug1: identity file /home/rother/.ssh/id_ed25519_sk type -1 debug1: identity file /home/rother/.ssh/id_ed25519_sk-cert type -1 debug1: identity file /home/rother/.ssh/id_xmss type -1 debug1: identity file /home/rother/.ssh/id_xmss-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.2 debug1: Remote protocol version 2.0, remote software version OpenSSH_8.2p1 Ubuntu-4ubuntu0.2 debug1: match: OpenSSH_8.2p1 Ubuntu-4ubuntu0.2 pat OpenSSH* compat 0x04000000 debug1: Authenticating to server:2222 as 'root' debug1: Offering GSSAPI proposal: gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-group14-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-gex-sha1-eipGX3TCiQSrx573bT1o1Q==,gss-group14-sha1-eipGX3TCiQSrx573bT1o1Q== debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: algorithm: gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g== debug1: kex: host key algorithm: ecdsa-sha2-nistp256 debug1: kex: server->client cipher: chacha20-poly1...@openssh.com MAC: <implicit> compression: none debug1: kex: client->server cipher: chacha20-poly1...@openssh.com MAC: <implicit> compression: none debug1: Doing group exchange debug1: Calling gss_init_sec_context debug1: Delegating credentials debug1: Received GSSAPI_COMPLETE debug1: Calling gss_init_sec_context debug1: Delegating credentials debug1: Rekey has happened - updating saved versions debug1: rekey out after 134217728 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: rekey in after 134217728 blocks debug1: Will attempt key: /home/rother/.ssh/id_rsa RSA SHA256:n/EY/cGjgd/r+7JpuqODxIotHHLsYptGXYx9GlKCWSM agent debug1: Will attempt key: /home/rother/.ssh/root_id_rsa RSA SHA256:yCLAID9FMILharHmDpCB8wW8eiA+iHa4oQKLODbbzKw agent debug1: Will attempt key: /home/user/.ssh/id_dsa debug1: Will attempt key: /home/user/.ssh/id_ecdsa debug1: Will attempt key: /home/user/.ssh/id_ecdsa_sk debug1: Will attempt key: /home/user/.ssh/id_ed25519 debug1: Will attempt key: /home/user/.ssh/id_ed25519_sk debug1: Will attempt key: /home/user/.ssh/id_xmss debug1: SSH2_MSG_EXT_INFO received debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,sk-ssh-ed25...@openssh.com,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp...@openssh.com> debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password debug1: Next authentication method: gssapi-with-mic debug1: Delegating credentials debug1: Delegating credentials debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password debug1: Next authentication method: gssapi-keyex Connection closed by 1.2.3.4 port 2222 Server log: debug1: sshd version OpenSSH_8.2, OpenSSL 1.1.1f 31 Mar 2020 debug1: private host key #0: ssh-rsa SHA256:REDACTED debug1: private host key #1: ecdsa-sha2-nistp256 SHA256:REDACTED debug1: private host key #2: ssh-ed25519 SHA256:REDACTED debug1: rexec_argv[0]='/usr/sbin/sshd' debug1: rexec_argv[1]='-d' debug1: rexec_argv[2]='-p' debug1: rexec_argv[3]='2222' debug1: Set /proc/self/oom_score_adj from 0 to -1000 debug1: Bind to port 2222 on 0.0.0.0. Server listening on 0.0.0.0 port 2222. debug1: Bind to port 2222 on ::. Server listening on :: port 2222. debug1: Server will not fork when running in debugging mode. debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8 debug1: sshd version OpenSSH_8.2, OpenSSL 1.1.1f 31 Mar 2020 debug1: private host key #0: ssh-rsa SHA256:REDACTED debug1: private host key #1: ecdsa-sha2-nistp256 SHA256:REDACTED debug1: private host key #2: ssh-ed25519 SHA256:REDACTED debug1: inetd sockets after dupping: 3, 3 Connection from 1.2.3.5 port 53724 on 1.2.3.4 port 2222 rdomain "" debug1: Local version string SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.2 debug1: Remote protocol version 2.0, remote software version OpenSSH_8.2p1 Ubuntu-4ubuntu0.2 debug1: match: OpenSSH_8.2p1 Ubuntu-4ubuntu0.2 pat OpenSSH* compat 0x04000000 debug1: permanently_set_uid: 111/65534 [preauth] debug1: list_hostkey_types: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519 [preauth] debug1: SSH2_MSG_KEXINIT sent [preauth] debug1: SSH2_MSG_KEXINIT received [preauth] debug1: kex: algorithm: gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g== [preauth] debug1: kex: host key algorithm: ecdsa-sha2-nistp256 [preauth] debug1: kex: client->server cipher: chacha20-poly1...@openssh.com MAC: <implicit> compression: none [preauth] debug1: kex: server->client cipher: chacha20-poly1...@openssh.com MAC: <implicit> compression: none [preauth] debug1: Doing group exchange [preauth] debug1: Wait SSH2_MSG_GSSAPI_INIT [preauth] debug1: Received some client credentials debug1: rekey out after 134217728 blocks [preauth] debug1: SSH2_MSG_NEWKEYS sent [preauth] debug1: Sending SSH2_MSG_EXT_INFO [preauth] debug1: expecting SSH2_MSG_NEWKEYS [preauth] debug1: SSH2_MSG_NEWKEYS received [preauth] debug1: rekey in after 134217728 blocks [preauth] debug1: KEX done [preauth] debug1: userauth-request for user root service ssh-connection method none [preauth] debug1: attempt 0 failures 0 [preauth] debug1: PAM: initializing for "root" debug1: PAM: setting PAM_RHOST to "1.2.3.5" debug1: PAM: setting PAM_TTY to "ssh" debug1: userauth-request for user root service ssh-connection method gssapi-with-mic [preauth] debug1: attempt 1 failures 0 [preauth] Postponed gssapi-with-mic for root from 1.2.3.5 port 53724 ssh2 [preauth] debug1: Received some client credentials Failed gssapi-with-mic for root from 1.2.3.5 port 53724 ssh2 debug1: userauth-request for user root service ssh-connection method gssapi-with-mic [preauth] debug1: attempt 2 failures 1 [preauth] debug1: userauth-request for user root service ssh-connection method gssapi-keyex [preauth] debug1: attempt 3 failures 1 [preauth] monitor_read: unpermitted request 48 debug1: do_cleanup debug1: PAM: cleanup debug1: Killing privsep child 5525 debug1: audit_event: unhandled event 12 The important line might be "monitor_read: unpermitted request 48" When disabling GSSAPIKeyExchange=yes, everything works as expected. This bug was discovered using Ansible, which uses "-o PreferredAuthentications=gssapi-with-mic,gssapi- keyex,hostbased,publickey" for it's ssh connections. A similar bugs was reported in RHEL 7: https://bugzilla.redhat.com/show_bug.cgi?id=1162620 Please let me know if you need any further information! To manage notifications about this bug go to: https://bugs.launchpad.net/openssh/+bug/1938144/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
