Re: [Buildroot] OpenSSH login fails on Raspberry Pi

[Romain Naour <romain.naour@gmail.com>]

Hello,

Le 27/08/2021 à 06:41, Matthias a écrit :
> Hi,
> I'm trying to set up OpenSSH on a Raspberry Pi 3 B+ but the server constantly closes connection when trying to log in.
> The system was built by the latest Buildroot (2021.08-rc2) and uses an external toolchain (Arm ARM 2020.11). The root password is set and PermitRootLogin is set to 'yes' in /etc/ssh/sshd_config. I was also replacing OpenSSH_8.6p1 by the latest version (8.7p1) which was released recently and an older version (8.4p1), but nothing changed.

This is an Arm ARM 2020.11 toolchain issue (kernel headers), see:
https://bugs.busybox.net/show_bug.cgi?id=13671

Best regards,
Romain


> 
> When using dropbear instead of OpenSSH, everything works fine right out of the box, btw.
> 
> Any help is being appreciated.
> 
> Here's some debug output of ssh and sshd:
> 
> # ssh -vvv root@localhost
> OpenSSH_8.6p1, OpenSSL 1.1.1l  24 Aug 2021
> debug1: Reading configuration data /etc/ssh/ssh_config
> debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/root/.ssh/known_hosts'
> debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/root/.ssh/known_hosts2'
> debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve; disabling
> debug2: resolving "localhost" port 22
> debug3: ssh_connect_direct: entering
> debug1: Connecting to localhost [127.0.0.1] port 22.
> debug3: set_sock_tos: set socket 3 IP_TOS 0x48
> debug1: Connection established.
> debug1: identity file /root/.ssh/id_rsa type -1
> debug1: identity file /root/.ssh/id_rsa-cert type -1
> debug1: identity file /root/.ssh/id_dsa type -1
> debug1: identity file /root/.ssh/id_dsa-cert type -1
> debug1: identity file /root/.ssh/id_ecdsa type -1
> debug1: identity file /root/.ssh/id_ecdsa-cert type -1
> debug1: identity file /root/.ssh/id_ecdsa_sk type -1
> debug1: identity file /root/.ssh/id_ecdsa_sk-cert type -1
> debug1: identity file /root/.ssh/id_ed25519 type -1
> debug1: identity file /root/.ssh/id_ed25519-cert type -1
> debug1: identity file /root/.ssh/id_ed25519_sk type -1
> debug1: identity file /root/.ssh/id_ed25519_sk-cert type -1
> debug1: identity file /root/.ssh/id_xmss type -1
> debug1: identity file /root/.ssh/id_xmss-cert type -1
> debug1: Local version string SSH-2.0-OpenSSH_8.6
> debug1: Remote protocol version 2.0, remote software version OpenSSH_8.6
> debug1: compat_banner: match: OpenSSH_8.6 pat OpenSSH* compat 0x04000000
> debug2: fd 3 setting O_NONBLOCK
> debug1: Authenticating to localhost:22 as 'root'
> debug3: record_hostkey: found key type ED25519 in file /root/.ssh/known_hosts:1
> debug3: load_hostkeys_file: loaded 1 keys from localhost
> debug1: load_hostkeys: fopen /root/.ssh/known_hosts2: No such file or directory
> debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
> debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
> debug3: order_hostkeyalgs: have matching best-preference key type ssh-ed25519-cert-v01@openssh.com, using HostkeyAlgorithms verbatim
> debug3: send packet: type 20
> debug1: SSH2_MSG_KEXINIT sent
> debug3: receive packet: type 20
> debug1: SSH2_MSG_KEXINIT received
> debug2: local client KEXINIT proposal
> debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c
> debug2: host key algorithms: ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa
> debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
> debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
> debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
> debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
> debug2: compression ctos: none,zlib@openssh.com,zlib
> debug2: compression stoc: none,zlib@openssh.com,zlib
> debug2: languages ctos:
> debug2: languages stoc:
> debug2: first_kex_follows 0
> debug2: reserved 0
> debug2: peer server KEXINIT proposal
> debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256
> debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519
> debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
> debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
> debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
> debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
> debug2: compression ctos: none,zlib@openssh.com
> debug2: compression stoc: none,zlib@openssh.com
> debug2: languages ctos:
> debug2: languages stoc:
> debug2: first_kex_follows 0
> debug2: reserved 0
> debug1: kex: algorithm: curve25519-sha256
> debug1: kex: host key algorithm: ssh-ed25519
> debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
> debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
> debug3: send packet: type 30
> debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
> debug3: receive packet: type 31
> debug1: SSH2_MSG_KEX_ECDH_REPLY received
> debug1: Server host key: ssh-ed25519 SHA256:vWKSulbx2tKNszD+Q4+TWS/7tA5Bq9fT6LBilpodk3U
> debug3: record_hostkey: found key type ED25519 in file /root/.ssh/known_hosts:1
> debug3: load_hostkeys_file: loaded 1 keys from localhost
> debug1: load_hostkeys: fopen /root/.ssh/known_hosts2: No such file or directory
> debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
> debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
> debug1: Host 'localhost' is known and matches the ED25519 host key.
> debug1: Found key in /root/.ssh/known_hosts:1
> debug3: send packet: type 21
> debug2: set_newkeys: mode 1
> debug1: rekey out after 134217728 blocks
> debug1: SSH2_MSG_NEWKEYS sent
> debug1: expecting S[  354.384103] audit: type=1326 audit(1629986646.781:8): auid=4294967295 uid=1001 gid=1001 ses=4294967295 pid=234 comm="sshd" exe="/usr/sbin/sshd" sig=31 arch=40000028 syscall=407 compat=0 ip=0x76b6b766 code=0x0
> SH2_MSG_NEWKEYS
> debug3: receive packet: type 21
> debug1: SSH2_MSG_NEWKEYS received
> debug2: set_newkeys: mode 0
> debug1: rekey in after 134217728 blocks
> debug1: Will attempt key: /root/.ssh/id[  354.419992] audit: type=1701 audit(1629986646.781:9): auid=4294967295 uid=1001 gid=1001 ses=4294967295 pid=234 comm="sshd" exe="/usr/sbin/sshd" sig=31 res=1
> _rsa
> debug1: Will attempt key: /root/.ssh/id_dsa
> debug1: Will attempt key: /root/.ssh/id_ecdsa
> debug1: Will attempt key: /root/.ssh/id_ecdsa_sk
> debug1: Will attempt key: /root/.ssh/id_ed25519
> debug1: Will attempt key: /root/.ssh/id_ed25519_sk
> debug1: Will attempt key: /root/.ssh/id_xmss
> debug2: pubkey_prepare: done
> debug3: send packet: type 5
> debug3: receive packet: type 7
> debug1: SSH2_MSG_EXT_INFO received
> debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,sk-ssh-ed25519@openssh.com,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp256@openssh.com,webauthn-sk-ecdsa-sha2-nistp256@openssh.com>
> debug3: receive packet: type 6
> debug2: service_accept: ssh-userauth
> debug1: SSH2_MSG_SERVICE_ACCEPT received
> debug3: send packet: type 50
> Connection closed by 127.0.0.1 port 22
> #
> 
> 
> # /usr/sbin/sshd -ddd
> debug2: load_server_config: filename /etc/ssh/sshd_config
> debug2: load_server_config: done config len = 214
> debug2: parse_server_config_depth: config /etc/ssh/sshd_config len 214
> debug3: /etc/ssh/sshd_config:32 setting PermitRootLogin yes
> debug3: /etc/ssh/sshd_config:41 setting AuthorizedKeysFile .ssh/authorized_keys
> debug3: /etc/ssh/sshd_config:109 setting Subsystem sftp	/usr/libexec/sftp-server
> debug1: sshd version OpenSSH_8.6, OpenSSL 1.1.1l  24 Aug 2021
> debug1: private host key #0: ssh-rsa SHA256:bq4fyrJzWs1LhVaHz9YG40yltBoPNkRZXdyNPUrCPMI
> debug1: private host key #1: ecdsa-sha2-nistp256 SHA256:aKEmr4uOGiK2zh6XD8f7a4G4uBoOt2Xu/HQuun8VU8Q
> debug1: private host key #2: ssh-ed25519 SHA256:vWKSulbx2tKNszD+Q4+TWS/7tA5Bq9fT6LBilpodk3U
> debug1: rexec_argv[0]='/usr/sbin/sshd'
> debug1: rexec_argv[1]='-ddd'
> debug3: oom_adjust_setup
> debug1: Set /proc/self/oom_score_adj from 0 to -1000
> debug2: fd 3 setting O_NONBLOCK
> debug1: Bind to port 22 on 0.0.0.0.
> Server listening on 0.0.0.0 port 22.
> debug2: fd 4 setting O_NONBLOCK
> debug3: sock_set_v6only: set socket 4 IPV6_V6ONLY
> debug1: Bind to port 22 on ::.
> Server listening on :: port 22.
> debug3: fd 5 is not O_NONBLOCK
> debug1: Server will not fork when running in debugging mode.
> debug3: send_rexec_state: entering fd = 8 config len 214
> debug3: ssh_msg_send: type 0
> debug3: send_rexec_state: done
> debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
> debug3: recv_rexec_state: entering fd = 5
> debug3: ssh_msg_recv entering
> debug3: recv_rexec_state: done
> debug2: parse_server_config_depth: config rexec len 214
> debug3: rexec:32 setting PermitRootLogin yes
> debug3: rexec:41 setting AuthorizedKeysFile .ssh/authorized_keys
> debug3: rexec:109 setting Subsystem sftp	/usr/libexec/sftp-server
> debug1: sshd version OpenSSH_8.6, OpenSSL 1.1.1l  24 Aug 2021
> debug1: private host key #0: ssh-rsa SHA256:bq4fyrJzWs1LhVaHz9YG40yltBoPNkRZXdyNPUrCPMI
> debug1: private host key #1: ecdsa-sha2-nistp256 SHA256:aKEmr4uOGiK2zh6XD8f7a4G4uBoOt2Xu/HQuun8VU8Q
> debug1: private host key #2: ssh-ed25519 SHA256:vWKSulbx2tKNszD+Q4+TWS/7tA5Bq9fT6LBilpodk3U
> debug1: inetd sockets after dupping: 3, 3
> Connection from 10.0.0.64 port 37910 on 10.0.0.192 port 22 rdomain ""
> debug1: Local version string SSH-2.0-OpenSSH_8.6
> debug1: Remote protocol version 2.0, remote software version OpenSSH_8.4p1 Debian-5
> debug1: compat_banner: match: OpenSSH_8.4p1 Debian-5 pat OpenSSH* compat 0x04000000
> debug2: fd 3 setting O_NONBLOCK
> debug3: ssh_sandbox_init: preparing seccomp filter sandbox
> debug2: Network child is on pid 245
> debug3: preauth child monitor started
> debug3: privsep user:group 1001:1001 [preauth]
> debug1: permanently_set_uid: 1001/1001 [preauth]
> debug3: ssh_sandbox_child: setting PR_SET_NO_NEW_PRIVS [preauth]
> debug3: ssh_sandbox_child: attaching seccomp filter program [preauth]
> debug1: list_hostkey_types: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519 [preauth]
> debug3: send packet: type 20 [preauth]
> debug1: SSH2_MSG_KEXINIT sent [preauth]
> debug3: receive packet: type 20 [preauth]
> debug1: SSH2_MSG_KEXINIT received [preauth]
> debug2: local server KEXINIT proposal [preauth]
> debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256 [preauth]
> debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519 [preauth]
> debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com [preauth]
> debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com [preauth]
> debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 [preauth]
> debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 [preauth]
> debug2: compression ctos: none,zlib@openssh.com [preauth]
> debug2: compression stoc: none,zlib@openssh.com [preauth]
> debug2: languages ctos:  [preauth]
> debug2: languages stoc:  [preauth]
> debug2: first_kex_follows 0  [preauth]
> debug2: reserved 0  [preauth]
> debug2: peer client KEXINIT proposal [preauth]
> debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c [preauth]
> debug2: host key algorithms: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp256@openssh.com,ssh-ed25519,sk-ssh-ed25519@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa [preauth]
> debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com [preauth]
> debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com [preauth]
> debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 [preauth]
> debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 [preauth]
> debug2: compression ctos: none,zlib@openssh.com,zlib [preauth]
> debug2: compression stoc: none,zlib@openssh.com,zlib [preauth]
> debug2: languages ctos:  [preauth]
> debug2: languages stoc:  [preauth]
> debug2: first_kex_follows 0  [preauth]
> debug2: reserved 0  [preauth]
> debug1: kex: algorithm: curve25519-sha256 [preauth]
> debug1: kex: host key algorithm: ecdsa-sha2-nistp256 [preauth]
> debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none [preauth]
> debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none [preauth]
> debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
> debug3: receive packet: type 30 [preauth]
> debug1: SSH2_MSG_KEX_ECDH_INIT received [preauth]
> debug3: mm_sshkey_sign: entering [preauth]
> debug3: mm_request_send: entering, type 6 [preauth]
> debug3: mm_sshkey_sign: waiting for MONITOR_ANS_SIGN [preauth]
> debug3: mm_request_receive_expect: entering, type 7 [preauth]
> debug3: mm_request_receive: entering [preauth]
> debug3: mm_request_receive: entering
> debug3: monitor_read: checking request 6
> debug3: mm_answer_sign: entering
> debug3: mm_answer_sign: KEX signature 0x1040a18(100)
> debug3: mm_request_send: entering, type 7
> debug2: monitor_read: 6 used once, disabling now
> debug3: send packet: type 31 [preauth]
> debug3: send packet: type 21 [preauth]
> debug2: set_newkeys: mode 1 [preauth]
> debug1: rekey out after 134217728 blocks [preauth]
> debug1: SSH2_MSG_NEWKEYS sent [preauth]
> debug1: Sending SSH2_MSG_EXT_INFO [preauth]
> debug3: send packet: type 7 [preauth]
> debug1: expecting SSH2_MSG_NEWKEYS [preauth]
> debug3: receive packet: type 21 [preauth]
> debug1: SSH2_MSG_NEWKEYS received [preauth]
> debug2: set_newkeys: mode 0 [preauth]
> debug1: rekey in after 134217728 blocks [preauth]
> debug1: KEX done [[  627.067180] audit: type=1326 audit(1629986919.461:10): auid=4294967295 uid=1001 gid=1001 ses=4294967295 pid=245 comm="sshd" exe="/usr/sbin/sshd" sig=31 arch=40000028 syscall=407 compat=0 ip=0x76ade766 code=0x0
> preauth]
> debug3: receive packet: type 5 [preauth]
> debug3: send packet: type 6 [preauth]
> debug3: receive packet: type 50 [preauth]
> debug1: userauth-request for user root service ssh-connection method [  627.103651] audit: type=1701 audit(1629986919.461:11): auid=4294967295 uid=1001 gid=1001 ses=4294967295 pid=245 comm="sshd" exe="/usr/sbin/sshd" sig=31 res=1
> none [preauth]
> debug1: attempt 0 failures 0 [preauth]
> debug3: mm_getpwnamallow: entering [preauth]
> debug3: mm_request_send: entering, type 8 [preauth]
> debug3: mm_getpwnamallow: waiting for MONITOR_ANS_PWNAM [preauth]
> debug3: mm_request_receive_expect: entering, type 9 [preauth]
> debug3: mm_request_receive: entering [preauth]
> debug3: mm_request_receive: entering
> debug3: monitor_read: checking request 8
> debug3: mm_answer_pwnamallow: entering
> debug2: parse_server_config_depth: config reprocess config len 214
> debug3: auth_shadow_acctexpired: today 18865 sp_expire -1 days left -18866
> debug3: account expiration disabled
> debug3: mm_answer_pwnamallow: sending MONITOR_ANS_PWNAM: 1
> debug3: mm_request_send: entering, type 9
> debug2: monitor_read: 8 used once, disabling now
> debug2: input_userauth_request: setting up authctxt for root [preauth]
> debug3: mm_inform_authserv: entering [preauth]
> debug3: mm_request_send: entering, type 4 [preauth]
> debug2: input_userauth_request: try method none [preauth]
> debug3: user_specific_delay: user specific delay 0.000ms [preauth]
> debug3: ensure_minimum_time_since: elapsed 10.980ms, delaying 9.319ms (requested 5.075ms) [preauth]
> debug1: monitor_read_log: child log fd closed
> debug3: mm_request_receive: entering
> debug3: monitor_read: checking request 4
> debug3: mm_answer_authserv: service=ssh-connection, style=
> debug2: monitor_read: 4 used once, disabling now
> debug3: mm_request_receive: entering
> debug1: do_cleanup
> debug1: Killing privsep child 245
> #
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