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Harden SSH config

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Jake Howard 2025-11-24 22:46:11 +00:00
parent c7c4340732
commit 649903aa94
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1 changed files with 27 additions and 22 deletions
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49
ansible/roles/base/files/sshd_config
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@ -1,10 +1,9 @@
# TCP port to bind to
# Change to a high/odd port if this server is exposed to the internet directly
Port {{ ssh_port }}
AllowUsers {% if hostname_slug in pve_hosts %}{{ me.user }}@{{ pve_hosts.internal_cidr }}{% endif %} {{ me.user }}@{{ tailscale_cidr }} {{ ssh_extra_allowed_users }}
# Bind to all interfaces (change to specific interface if needed)
# Bind to all interfaces
ListenAddress 0.0.0.0
# Force SSHv2 Protocol
@ -13,7 +12,6 @@ Protocol 2
HostKey /etc/ssh/ssh_host_ed25519_key
# Public key authentication + Password authentication
# Two-Factor Authentication in OpenSSH v6.2+
PubkeyAuthentication yes
AuthenticationMethods publickey
@ -22,7 +20,7 @@ PermitRootLogin no
# Client timeout
ClientAliveInterval 60
ClientAliveCountMax 100
ClientAliveCountMax 60
# Compression (only after authentication)
Compression delayed
@ -31,31 +29,21 @@ Compression delayed
SyslogFacility AUTH
LogLevel INFO
# Authentication must happen within 30 seconds
LoginGraceTime 30
# Authentication must happen within 10 seconds
LoginGraceTime 10
MaxAuthTries 3
PermitEmptyPasswords no
# Check user folder permissions before allowing access
StrictModes yes
# Message Authentication Code (Hash, only SHA2-512)
# SHA-256 included for compat with PuTTY-WinCrypt clients
MACs hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,umac-128-etm@openssh.com
# Ciphers (only secure AES-256)
Ciphers aes256-ctr,aes128-gcm@openssh.com,aes128-ctr,aes192-ctr,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com
# Key Exchange algorithms (Elliptic Curve Diffie-Hellman)
# DH-SHA-256 included for compat with PuTTY-WinCrypt clients
KexAlgorithms diffie-hellman-group18-sha512,curve25519-sha256,curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512
# Don't read the user's ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# Disable unused authentication schemes
HostbasedAuthentication no
ChallengeResponseAuthentication no
KbdInteractiveAuthentication no
KerberosAuthentication no
GSSAPIAuthentication no
UsePAM no
@ -63,13 +51,30 @@ UsePAM no
# X11 support
X11Forwarding no
# Don't show Message of the Day
PrintMotd yes
# TCPKeepAlive (non-tunneled, disabled)
TCPKeepAlive no
PrintLastLog yes
# Allow client to pass locale environment variables
AcceptEnv LANG LC_*
Subsystem sftp internal-sftp
# Restrict key exchange, cipher, and MAC algorithms, as per sshaudit.com
# hardening guide.
KexAlgorithms sntrup761x25519-sha512@openssh.com,gss-curve25519-sha256-,curve25519-sha256,curve25519-sha256@libssh.org,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha256,gss-group16-sha512-,diffie-hellman-group16-sha512
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-gcm@openssh.com,aes128-ctr
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com
RequiredRSASize 3072
HostKeyAlgorithms sk-ssh-ed25519-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256
CASignatureAlgorithms sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256
GSSAPIKexAlgorithms gss-curve25519-sha256-,gss-group16-sha512-
HostbasedAcceptedAlgorithms sk-ssh-ed25519-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256
PubkeyAcceptedAlgorithms sk-ssh-ed25519-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256