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#
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# Setup SSH settings and public keys
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#
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# Load utility functions
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. ./functions.sh
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if [ "$SSH_ENABLE" = true ] ; then
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DROPBEAR_ARGS=""
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if [ "$SSH_ENABLE_ROOT" = false ] ; then
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if [ "$ENABLE_REDUCE" = false ] || [ "$REDUCE_SSHD" = false ] ; then
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# User root is not allowed to log in
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sed -i "s|[#]*PermitRootLogin.*|PermitRootLogin no|g" "${ETC_DIR}/ssh/sshd_config"
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else
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# User root is not allowed to log in
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DROPBEAR_ARGS="-w"
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fi
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fi
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if [ "$ENABLE_ROOT" = true ] && [ "$SSH_ENABLE_ROOT" = true ] ; then
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if [ "$ENABLE_REDUCE" = false ] || [ "$REDUCE_SSHD" = false ] ; then
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# Permit SSH root login
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sed -i "s|[#]*PermitRootLogin.*|PermitRootLogin yes|g" "${ETC_DIR}/ssh/sshd_config"
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else
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# Permit SSH root login
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DROPBEAR_ARGS=""
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fi
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# Add SSH (v2) public key for user root
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if [ -n "$SSH_ROOT_PUB_KEY" ] ; then
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# Create root SSH config directory
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mkdir -p "${R}/root/.ssh"
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# Set permissions of root SSH config directory
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chroot_exec chmod 700 "/root/.ssh"
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chroot_exec chown root:root "/root/.ssh"
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# Add SSH (v2) public key(s) to authorized_keys file
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cat "$SSH_ROOT_PUB_KEY" >> "${R}/root/.ssh/authorized_keys"
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# Set permissions of root SSH authorized_keys file
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chroot_exec chmod 600 "/root/.ssh/authorized_keys"
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chroot_exec chown root:root "/root/.ssh/authorized_keys"
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if [ "$ENABLE_REDUCE" = false ] || [ "$REDUCE_SSHD" = false ] ; then
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# Allow SSH public key authentication
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sed -i "s|[#]*PubkeyAuthentication.*|PubkeyAuthentication yes|g" "${ETC_DIR}/ssh/sshd_config"
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fi
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fi
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fi
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if [ "$ENABLE_USER" = true ] ; then
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# Add SSH (v2) public key for user $USER_NAME
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if [ -n "$SSH_USER_PUB_KEY" ] ; then
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# Create $USER_NAME SSH config directory
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mkdir -p "${R}/home/${USER_NAME}/.ssh"
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# Set permissions of $USER_NAME SSH config directory
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chroot_exec chmod 700 "/home/${USER_NAME}/.ssh"
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chroot_exec chown "${USER_NAME}":"${USER_NAME}" "/home/${USER_NAME}/.ssh"
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# Add SSH (v2) public key(s) to authorized_keys file
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cat "$SSH_USER_PUB_KEY" >> "${R}/home/${USER_NAME}/.ssh/authorized_keys"
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# Set permissions of $USER_NAME SSH config directory
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chroot_exec chmod 600 "/home/${USER_NAME}/.ssh/authorized_keys"
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chroot_exec chown "${USER_NAME}":"${USER_NAME}" "/home/${USER_NAME}/.ssh/authorized_keys"
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if [ "$ENABLE_REDUCE" = false ] || [ "$REDUCE_SSHD" = false ] ; then
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# Allow SSH public key authentication
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sed -i "s|[#]*PubkeyAuthentication.*|PubkeyAuthentication yes|g" "${ETC_DIR}/ssh/sshd_config"
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fi
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fi
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fi
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# Limit the users that are allowed to login via SSH
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if [ "$SSH_LIMIT_USERS" = true ] && [ "$ENABLE_REDUCE" = false ] ; then
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allowed_users=""
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if [ "$ENABLE_ROOT" = true ] && [ "$SSH_ENABLE_ROOT" = true ] ; then
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allowed_users="root"
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fi
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if [ "$ENABLE_USER" = true ] ; then
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allowed_users="${allowed_users} ${USER_NAME}"
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fi
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if [ -n "$allowed_users" ] ; then
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echo "AllowUsers ${allowed_users}" >> "${ETC_DIR}/ssh/sshd_config"
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fi
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fi
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# Disable password-based authentication
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if [ "$SSH_DISABLE_PASSWORD_AUTH" = true ] ; then
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if [ "$ENABLE_ROOT" = true ] && [ "$SSH_ENABLE_ROOT" = true ] ; then
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if [ "$ENABLE_REDUCE" = false ] || [ "$REDUCE_SSHD" = false ] ; then
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sed -i "s|[#]*PermitRootLogin.*|PermitRootLogin without-password|g" "${ETC_DIR}/ssh/sshd_config"
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else
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DROPBEAR_ARGS="-g"
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fi
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fi
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if [ "$ENABLE_REDUCE" = false ] || [ "$REDUCE_SSHD" = false ] ; then
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sed -i "s|[#]*PasswordAuthentication.*|PasswordAuthentication no|g" "${ETC_DIR}/ssh/sshd_config"
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sed -i "s|[#]*ChallengeResponseAuthentication no.*|ChallengeResponseAuthentication no|g" "${ETC_DIR}/ssh/sshd_config"
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sed -i "s|[#]*UsePAM.*|UsePAM no|g" "${ETC_DIR}/ssh/sshd_config"
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else
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DROPBEAR_ARGS="${DROPBEAR_ARGS} -s"
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fi
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fi
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# Update dropbear SSH configuration
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if [ "$ENABLE_REDUCE" = true ] && [ "$REDUCE_SSHD" = true ] ; then
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sed "s|^DROPBEAR_EXTRA_ARGS=.*|DROPBEAR_EXTRA_ARGS=\"${DROPBEAR_ARGS}\"|g" "${ETC_DIR}/default/dropbear"
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fi
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fi
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