2015/11/12 7:20 "Paulo Roberto" <betobrandao@gmail.com>:
>
> Dear list,
>
> I need some help.
>
>
> After upgrading the openssh-server package to the version:
>
> ii openssh-server 1:6.9p1-2+b1 amd64 secure shell (SSH) server, for secure access from remote machines
>
> The option AllowUsers of /etc/ssh/sshd_config stopped working.
> Any user can log through ssh even not present in this option.
AllowUsers assumes you have set the default to deny, I think. If that got changed when you merged settings, it would result in what you are seeing.
If you need more information, I tend to use the archives at marc.info for the openssh and openbsd lists. Check the archives before you post to the lists.
> Before the upgrade everything worked fine.
>
> I tested the same sshd_config file in my OpenBSD box and there everything worked as expected.
>
> OpenSSH_6.7, LibreSSL 2.0
>
> Could it be a BUG?
>
> Below follow the sshd debug and my /etc/ssh/sshd_config
>
> Thanks in advance for your time and help.
>
>
> # /usr/sbin/sshd -D -f /etc/ssh/sshd_config -d
> debug1: sshd version OpenSSH_6.9, OpenSSL 1.0.2d 9 Jul 2015
> debug1: private host key #0: ssh-rsa SHA256:*************************
> debug1: private host key #1: ssh-dss SHA256:*************************
> debug1: private host key #2: ecdsa-sha2-nistp521 SHA256:*****************************
> debug1: rexec_argv[0]='/usr/sbin/sshd'
> debug1: rexec_argv[1]='-D'
> debug1: rexec_argv[2]='-f'
> debug1: rexec_argv[3]='/etc/ssh/sshd_config'
> debug1: rexec_argv[4]='-d'
> Set /proc/self/oom_score_adj from 0 to -1000
> debug1: Bind to port 22 on 0.0.0.0.
> Server listening on 0.0.0.0 port 22.
> debug1: Bind to port 22 on ::.
> Server listening on :: port 22.
> debug1: Server will not fork when running in debugging mode.
> debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
> debug1: inetd sockets after dupping: 3, 3
> Connection from 200.137.21.34 port 53540 on 192.168.1.3 port 22
> debug1: Client protocol version 2.0; client software version OpenSSH_6.6.1p1 Ubuntu-2ubuntu2
> debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 pat OpenSSH_6.6.1* compat 0x04000000
> debug1: Enabling compatibility mode for protocol 2.0
> debug1: Local version string SSH-2.0-OpenSSH_6.9p1 Debian-2+b1
> debug1: permanently_set_uid: 112/65534 [preauth]
> debug1: list_hostkey_types: ssh-rsa,ssh-dss,ecdsa-sha2-nistp521 [preauth]
> debug1: SSH2_MSG_KEXINIT sent [preauth]
> debug1: SSH2_MSG_KEXINIT received [preauth]
> debug1: kex: client->server aes256-gcm@openssh.com <implicit> none [preauth]
> debug1: kex: server->client aes256-gcm@openssh.com <implicit> none [preauth]
> debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
> debug1: SSH2_MSG_NEWKEYS sent [preauth]
> debug1: expecting SSH2_MSG_NEWKEYS [preauth]
> debug1: SSH2_MSG_NEWKEYS received [preauth]
> debug1: KEX done [preauth]
> debug1: userauth-request for user user1 service ssh-connection method none [preauth]
> debug1: attempt 0 failures 0 [preauth]
> debug1: user user1 does not match group list hg-users at line 93
> debug1: PAM: initializing for "user1"
> debug1: PAM: setting PAM_RHOST to "200.137.21.34"
> debug1: PAM: setting PAM_TTY to "ssh"
> debug1: userauth-request for user user1 service ssh-connection method publickey [preauth]
> debug1: attempt 1 failures 0 [preauth]
> debug1: test whether pkalg/pkblob are acceptable [preauth]
> debug1: temporarily_use_uid: 1000/1000 (e=0/0)
> debug1: trying public key file /home/user1/.ssh/authorized_keys
> debug1: fd 4 clearing O_NONBLOCK
> debug1: restore_uid: 0/0
> debug1: temporarily_use_uid: 1000/1000 (e=0/0)
> debug1: trying public key file /home/user1/.ssh/authorized_keys2
> debug1: Could not open authorized keys '/home/user1/.ssh/authorized_keys2': No such file or directory
> debug1: restore_uid: 0/0
> Failed publickey for user1 from 200.137.21.34 port 53540 ssh2: RSA SHA256:***************************
> debug1: userauth-request for user user1 service ssh-connection method password [preauth]
> debug1: attempt 2 failures 1 [preauth]
> debug1: PAM: password authentication accepted for user1
> debug1: do_pam_account: called
> Accepted password for user1 from 200.137.21.34 port 53540 ssh2
> debug1: monitor_child_preauth: user1 has been authenticated by privileged process
> debug1: monitor_read_log: child log fd closed
> debug1: PAM: establishing credentials
> User child is on pid 13122
> debug1: SELinux support disabled
> debug1: PAM: establishing credentials
> debug1: permanently_set_uid: 1000/1000
> debug1: ssh_packet_set_postauth: called
> debug1: Entering interactive session for SSH2.
> debug1: server_init_dispatch_20
> debug1: server_input_channel_open: ctype session rchan 0 win 1048576 max 16384
> debug1: input_session_request
> debug1: channel 0: new [server-session]
> debug1: session_new: session 0
> debug1: session_open: channel 0
> debug1: session_open: session 0: link with channel 0
> debug1: server_input_channel_open: confirm session
> debug1: server_input_global_request: rtype no-more-sessions@openssh.com want_reply 0
> debug1: server_input_channel_req: channel 0 request pty-req reply 1
> debug1: session_by_channel: session 0 channel 0
> debug1: session_input_channel_req: session 0 req pty-req
> debug1: Allocating pty.
> debug1: session_new: session 0
> debug1: SELinux support disabled
> debug1: session_pty_req: session 0 alloc /dev/pts/4
> debug1: server_input_channel_req: channel 0 request env reply 0
> debug1: session_by_channel: session 0 channel 0
> debug1: session_input_channel_req: session 0 req env
> debug1: server_input_channel_req: channel 0 request shell reply 1
> debug1: session_by_channel: session 0 channel 0
> debug1: session_input_channel_req: session 0 req shell
> Starting session: shell on pts/4 for user1 from 200.137.21.34 port 53540
> debug1: Setting controlling tty using TIOCSCTTY.
> debug1: Received SIGCHLD.
> debug1: session_by_pid: pid 13123
> debug1: session_exit_message: session 0 channel 0 pid 13123
> debug1: session_exit_message: release channel 0
> debug1: session_by_tty: session 0 tty /dev/pts/4
> debug1: session_pty_cleanup: session 0 release /dev/pts/4
> debug1: session_by_channel: session 0 channel 0
> debug1: session_close_by_channel: channel 0 child 0
> debug1: session_close: session 0 pid 0
> debug1: channel 0: free: server-session, nchannels 1
> Received disconnect from 200.137.21.34: 11: disconnected by user
> Disconnected from 200.137.21.34
> debug1: do_cleanup
> debug1: do_cleanup
> debug1: PAM: cleanup
> debug1: PAM: closing session
> debug1: PAM: deleting credentials
> debug1: audit_event: unhandled event 12
>
> ==============================================================
> sshd_config:
>
>
> # Package generated configuration file
> # See the sshd_config(5) manpage for details
>
> # What ports, IPs and protocols we listen for
> Port 22
> # Use these options to restrict which interfaces/protocols sshd will bind to
> #ListenAddress ::
> #ListenAddress 0.0.0.0
> Protocol 2
> # HostKeys for protocol version 2
> HostKey /etc/ssh/ssh_host_rsa_key
> HostKey /etc/ssh/ssh_host_dsa_key
> HostKey /etc/ssh/ssh_host_ecdsa_key
> #Privilege Separation is turned on for security
> UsePrivilegeSeparation yes
>
> # Lifetime and size of ephemeral version 1 server key
> KeyRegenerationInterval 3600
> ServerKeyBits 4096
>
> # Logging
> SyslogFacility AUTH
> LogLevel INFO
>
> # Authentication:
> LoginGraceTime 120
> #PermitRootLogin without-password
> PermitRootLogin no
> StrictModes yes
>
> RSAAuthentication yes
> PubkeyAuthentication yes
> #AuthorizedKeysFile %h/.ssh/authorized_keys
>
> # Don't read the user's ~/.rhosts and ~/.shosts files
> IgnoreRhosts yes
> # For this to work you will also need host keys in /etc/ssh_known_hosts
> RhostsRSAAuthentication no
> # similar for protocol version 2
> HostbasedAuthentication no
> # Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
> #IgnoreUserKnownHosts yes
>
> # To enable empty passwords, change to yes (NOT RECOMMENDED)
> PermitEmptyPasswords no
>
> # Change to yes to enable challenge-response passwords (beware issues with
> # some PAM modules and threads)
> ChallengeResponseAuthentication no
>
> # Change to no to disable tunnelled clear text passwords
> #PasswordAuthentication yes
>
> # Kerberos options
> #KerberosAuthentication no
> #KerberosGetAFSToken no
> #KerberosOrLocalPasswd yes
> #KerberosTicketCleanup yes
>
> # GSSAPI options
> #GSSAPIAuthentication no
> #GSSAPICleanupCredentials yes
>
> X11Forwarding yes
> X11DisplayOffset 10
> PrintMotd no
> PrintLastLog yes
> TCPKeepAlive yes
> Ciphers aes256-cbc,aes256-gcm@openssh.com,aes256-cbc
> MACs hmac-sha2-512,hmac-sha2-256
> #UseLogin no
>
> #MaxStartups 10:30:60
> #Banner /etc/issue.net
>
> # Allow client to pass locale environment variables
> AcceptEnv LANG LC_*
>
> Subsystem sftp /usr/lib/openssh/sftp-server
>
> # Set this to 'yes' to enable PAM authentication, account processing,
> # and session processing. If this is enabled, PAM authentication will
> # be allowed through the ChallengeResponseAuthentication and
> # PasswordAuthentication. Depending on your PAM configuration,
> # PAM authentication via ChallengeResponseAuthentication may bypass
> # the setting of "PermitRootLogin without-password".
> # If you just want the PAM account and session checks to run without
> # PAM authentication, then enable this but set PasswordAuthentication
> # and ChallengeResponseAuthentication to 'no'.
> UsePAM yes
>
> AllowUsers remoteguest
>
>
>