mirror of
https://github.com/kevinveenbirkenbach/computer-playbook.git
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Kevin Veen-Birkenbach
73ba09fbe2
- Added 'GSSAPIAuthentication no' to prevent unnecessary Kerberos negotiation delays. - Added 'UseDNS no' to skip reverse DNS resolution during SSH login, improving connection speed. - Both changes improve SSH responsiveness, especially in non-domain environments. Reference: https://chatgpt.com/share/68efc179-1a10-800f-9656-1e8731b40546
134 lines
3.8 KiB
Django/Jinja
134 lines
3.8 KiB
Django/Jinja
# $OpenBSD: sshd_config,v 1.101 2017/03/14 07:19:07 djm Exp $
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# This is the sshd server system-wide configuration file. See
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# sshd_config(5) for more information.
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# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin
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# The strategy used for options in the default sshd_config shipped with
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# OpenSSH is to specify options with their default value where
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# possible, but leave them commented. Uncommented options override the
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# default value.
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#Port 22
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#AddressFamily any
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#ListenAddress 0.0.0.0
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#ListenAddress ::
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#HostKey /etc/ssh/ssh_host_rsa_key
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#HostKey /etc/ssh/ssh_host_dsa_key
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#HostKey /etc/ssh/ssh_host_ecdsa_key
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#HostKey /etc/ssh/ssh_host_ed25519_key
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# Ciphers and keying
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#RekeyLimit default none
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# Logging
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#SyslogFacility AUTH
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LogLevel {% if MODE_DEBUG | bool %}DEBUG3{% else %}INFO{% endif %}
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# Authentication:
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#LoginGraceTime 2m
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PermitRootLogin no
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#StrictModes yes
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#MaxAuthTries 6
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#MaxSessions 10
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PubkeyAuthentication yes
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# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
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# but this is overridden so installations will only check .ssh/authorized_keys
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AuthorizedKeysFile .ssh/authorized_keys
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#AuthorizedPrincipalsFile none
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#AuthorizedKeysCommand none
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#AuthorizedKeysCommandUser nobody
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# For this to work you will also need host keys in /etc/ssh/ssh_known
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#HostbasedAuthentication no
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# Change to yes if you don't trust ~/.ssh/known for
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# HostbasedAuthentication
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#IgnoreUserKnownHosts no
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# Don't read the user's ~/.rhosts and ~/.shosts files
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#IgnoreRhosts yes
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# To disable tunneled clear text passwords, change to no here!
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PasswordAuthentication no
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#PermitEmptyPasswords no
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# Change to no to disable s/key passwords
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ChallengeResponseAuthentication no
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# Kerberos options
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#KerberosAuthentication no
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#KerberosOrLocalPasswd yes
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#KerberosTicketCleanup yes
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#KerberosGetAFSToken no
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# GSSAPI options
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# Disable GSSAPI (Kerberos) authentication to avoid unnecessary negotiation delays.
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# This setting is useful for non-domain environments where GSSAPI is not used,
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# improving SSH connection startup time and reducing overhead.
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# See: https://chatgpt.com/share/68efc179-1a10-800f-9656-1e8731b40546
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GSSAPIAuthentication no
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#GSSAPICleanupCredentials yes
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# Set this to 'yes' to enable PAM authentication, account processing,
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# and session processing. If this is enabled, PAM authentication will
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# be allowed through the ChallengeResponseAuthentication and
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# PasswordAuthentication. Depending on your PAM configuration,
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# PAM authentication via ChallengeResponseAuthentication may bypass
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# the setting of "PermitRootLogin without-password".
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# If you just want the PAM account and session checks to run without
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# PAM authentication, then enable this but set PasswordAuthentication
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# and ChallengeResponseAuthentication to 'no'.
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UsePAM yes
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#AllowAgentForwarding yes
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#AllowTcpForwarding yes
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#GatewayPorts no
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#X11Forwarding no
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#X11DisplayOffset 10
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#X11UseLocalhost yes
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#PermitTTY yes
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PrintMotd no # pam does that
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#PrintLastLog yes
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#TCPKeepAlive yes
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#UseLogin no
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#PermitUserEnvironment no
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#Compression delayed
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#ClientAliveInterval 0
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#ClientAliveCountMax 3
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# Disable reverse DNS lookups to speed up SSH logins.
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# When UseDNS is enabled, sshd performs a reverse DNS lookup for each connecting client,
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# which can significantly delay authentication if DNS resolution is slow or misconfigured.
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# See: https://chatgpt.com/share/68efc179-1a10-800f-9656-1e8731b40546
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UseDNS no
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#PidFile /run/sshd.pid
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#MaxStartups 10:30:100
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#PermitTunnel no
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#ChrootDirectory none
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#VersionAddendum none
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# no default banner path
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#Banner none
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# override default of no subsystems
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{% if ansible_os_family == "Archlinux" %}
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Subsystem sftp /usr/lib/ssh/sftp-server
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{% else%}
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Subsystem sftp /usr/lib/openssh/sftp-server
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{% endif %}
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# Example of overriding settings on a per-user basis
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#Match User anoncvs
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# X11Forwarding no
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# AllowTcpForwarding no
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# PermitTTY no
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# ForceCommand cvs server
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