119 lines
3 KiB
Bash
Executable file
119 lines
3 KiB
Bash
Executable file
#!/bin/sh
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UNAME=$(uname)
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case ${UNAME} in
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Linux)
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if [ ${EUID} -ne 0 ]; then
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echo "error: this script must be run as root" 1>&2
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exit 1
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fi
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;;
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OpenBSD|FreeBSD)
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if [ $(id -u) -ne 0 ]; then
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echo "error: this script must be run as root" 1>&2
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exit 1
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fi
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;;
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esac
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echo "warning: this script will disable ssh password authentication"
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read -p "continue? [y/N] " answer
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if [ "${answer}" != "y" ]; then
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exit 0
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fi
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echo "generating safe moduli"
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if [ -f /etc/ssh/moduli ]; then
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awk '$5 > 2000' /etc/ssh/moduli > /tmp/moduli
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mv /tmp/moduli /etc/ssh/moduli
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else
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ssh-keygen -G /etc/ssh/moduli.all -b 4096
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ssh-keygen -T /etc/ssh/moduli.safe -f /etc/ssh/moduli.all
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mv /etc/ssh/moduli.safe /etc/ssh/moduli
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rm /etc/ssh/moduli.all
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fi
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echo "cleaning ssh host keys"
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rm /etc/ssh/ssh_host_*key*
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ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key < /dev/null
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ssh-keygen -t rsa -b 4096 -f /etc/ssh/ssh_host_rsa_key < /dev/null
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echo "writing ssh config"
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if [ -f /etc/ssh/sshd_config ]; then
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mv /etc/ssh/sshd_config /etc/ssh/sshd_config.bak
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fi
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cat << EOF > /etc/ssh/sshd_config
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Port 22
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Protocol 2
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HostKey /etc/ssh/ssh_host_ed25519_key
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HostKey /etc/ssh/ssh_host_rsa_key
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KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256
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Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
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MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-ripemd160-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,hmac-ripemd160,umac-128@openssh.com
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UsePrivilegeSeparation sandbox
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PermitRootLogin no
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RSAAuthentication no
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PubkeyAuthentication yes
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ChallengeResponseAuthentication no
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PasswordAuthentication no
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PrintMotd no
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EOF
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case ${UNAME} in
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Linux)
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cat << EOF >> /etc/ssh/sshd_config
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AuthorizedKeysFile %h/.ssh/authorized_keys
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Subsystem sftp /usr/lib/openssh/sftp-server
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UsePAM yes
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EOF
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;;
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OpenBSD|FreeBSD)
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cat << EOF >> /etc/ssh/sshd_config
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Subsystem sftp /usr/libexec/sftp-server
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AuthorizedKeysFile .ssh/authorized_keys
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EOF
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;;
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esac
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read -p "enter your username " user
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if [ -z "${user}" ]; then
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echo "error: no user submitted" 1>&2
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mv /etc/ssh/sshd_config.bak /etc/ssh/sshd_config
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exit 1
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fi
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if [ ! -d /home/${user}/.ssh ]; then
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mkdir /home/${user}/.ssh
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fi
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chmod 700 /home/${user}/.ssh
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chown ${user}: /home/${user}/.ssh
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read -p "paste your ssh public key " sshkey
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if [ -z "${sshkey}" ]; then
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echo "error: no ssh key submitted" 1>&2
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mv /etc/ssh/sshd_config.bak /etc/ssh/sshd_config
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exit 1
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fi
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echo "${sshkey}" > /home/${user}/.ssh/authorized_keys
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chmod 600 /home/${user}/.ssh/authorized_keys
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chown ${user}:root /home/${user}/.ssh/authorized_keys
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case ${UNAME} in
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Linux)
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service ssh restart
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;;
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OpenBSD|FreeBSD)
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/etc/rc.d/sshd restart
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;;
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esac
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if [ -z "$(ps aux | awk '/\/usr\/s?bin\/sshd/')" ]; then
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echo "error: ssh service failed to restart" 1>&2
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echo "please check for sshd config errors manually" 1>&2
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exit 1
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fi
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