153 lines
7.3 KiB
Bash
153 lines
7.3 KiB
Bash
#!/bin/sh
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#
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# Check if user is root
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#
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if [ $(id -u) != "0" ]; then
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echo "Error: You must be root to run this script, please use the root user to install the software."
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exit 1
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fi
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if [ ! -f /etc/debian_version ]; then
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echo "Unsupported Linux Distribution. Prepared for Debian"
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exit 1
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fi
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#
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# Sicherheitskopie der SSH-Serverkonfiguration erstellen
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mv /etc/ssh/{sshd_config,sshd_config.orig}
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# SSH-Key erstellen
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ssh-keygen -o -a 100 -t ed25519 -N "" -f /etc/ssh/ssh_host_ed25519_key -C "$(whoami)@$(hostname)-$(date -I)"
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cat > /etc/ssh/sshd_config <<"EOF"
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#-----------------------------------------------------------
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# General - /etc/ssh/sshd_config
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#-----------------------------------------------------------
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Port 22 # Custom SSH Port
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Protocol 2 # The one and only Protocol
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AddressFamily any # IPv4 and IPv6 Net. Use inet for only IPv4
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#-----------------------------------------------------------
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# HostKey - Only the curvy one
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#-----------------------------------------------------------
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HostKey /etc/ssh/ssh_host_ed25519_key # Allow only the vely vely secure ECDSA Pub-Key Authentication
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#-----------------------------------------------------------
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# Ciphers - Only the ultramodern ones
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#-----------------------------------------------------------
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KexAlgorithms curve25519-sha256@libssh.org # Key exchange methods to generate per-connection keys
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MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-512 # Message authentication codes used to detect traffic modification
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Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com # Allow only sexy Encrypt-Ciphers. For Android-Connection add aes256-ctr
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HostKeyAlgorithms ssh-ed25519-cert-v01@openssh.com,ssh-ed25519 # Accepted Pub-Key algorithms for the SSH-Server to authenticate to a SSH-Client
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#-----------------------------------------------------------
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# Logging
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#-----------------------------------------------------------
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LogLevel INFO # VERBOSE for more like key fingerprint logging
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SyslogFacility AUTHPRIV # Logging Authentication Commands
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#-----------------------------------------------------------
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# Authentication:
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#-----------------------------------------------------------
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MaxSessions 2 # Maximum allowed User Sessions
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MaxAuthTries 3 # Maximum allowed Auth Attempts
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StrictModes yes # Prevents Configuration Errors
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LoginGraceTime 60 # Login Period Time to authenticate
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PermitRootLogin yes # Disable direct root Login
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PubkeyAuthentication yes # Allow Pub-Key Authentication
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PasswordAuthentication no # Allow Password Authentication. Disable if no need
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IgnoreRhosts yes # Disable User Rhost Files
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PermitEmptyPasswords no # Disable Empty Passwords
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HostbasedAuthentication no # Disable Host-based Authentication
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ChallengeResponseAuthentication no
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TCPKeepAlive yes # Prevent from dropping the Connection
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ClientAliveCountMax 2 # Sends 2 times ClientAlive Message till drop
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ClientAliveInterval 1800 # Kills Connection after 30 Min inactivity
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#-----------------------------------------------------------
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# Security
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#-----------------------------------------------------------
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UsePAM yes # Allow PAM Authentication
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Compression no # Disable Compression for better Security
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AllowUsers manager root # Allow special Users.
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# AllowGroups sshuser # Allow special Group.
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# RekeyLimit 1G 1H # Limiting amount of data transmitted with a single session key
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Banner none # Disable Banner
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DebianBanner no # Disable Banner for Debian-based Systems
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VersionAddendum none # Disable SSH Protocol Banner
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PrintMotd no # Disable Message of the Day
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PrintLastLog yes # Enable Date and Time of the last user login
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PermitTunnel no # Disable tun Device forwarding. Only SSH Connections!
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PermitUserRC no # Disable User RC Files
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PermitUserEnvironment no # Disable User Environment Files
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# Disable Forwarding
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GatewayPorts no # Disable Remote Port Forwarding
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X11Forwarding no # Disable X11 Forwarding/Tunneling (GUI)
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AllowTcpForwarding no # Disable TCP Forwarding/Tunneling
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AllowAgentForwarding no # Disable Agent Forwarding/Tunneling
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# Disable Kerberos Authentication # Disable Kerberos Authentication
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KerberosOrLocalPasswd no
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KerberosAuthentication no
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KerberosTicketCleanup yes
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GSSAPIAuthentication no
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GSSAPICleanupCredentials yes
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AuthorizedKeysFile %h/.ssh/authorized_keys # Set AuthorizedKeysFile in a controlled manner
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#-----------------------------------------------------------
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# Misc
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#-----------------------------------------------------------
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UseDNS no # Disables DSN-Lookup for the Love of Speed
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AcceptEnv LANG LC_* # Allow locale environment variables for Clients
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#-----------------------------------------------------------
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# SFTP
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#-----------------------------------------------------------
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# SFTP - Enable if need
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Subsystem sftp /usr/lib/openssh/sftp-server -f AUTHPRIV -l INFO
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# Set special stuff to special SFTP-Users - Enable if you use SFTP
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# Match Group sftp-pimps
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# ChrootDirectory /home/%u
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# PermitTunnel no
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# X11Forwarding no
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# AllowTcpForwarding no
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# AllowAgentForwarding no
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# ForceCommand internal-sftp
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#-----------------------------------------------------------
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# Set special SSH-User/Group options
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#-----------------------------------------------------------
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# Match User manager
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# PasswordAuthentication yes
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# AllowTcpForwarding yes
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# Match Group sshuser
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# PasswordAuthentication yes
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# AllowTcpForwarding yes
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#-----------------------------------------------------------
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# Documentation
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#-----------------------------------------------------------
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# https://man7.org/linux/man-pages/man1/ssh-keygen.1.html
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# https://man7.org/linux/man-pages/man5/sshd_config.5.html
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EOF
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apt autoremove && apt autoclean && apt clean
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