163 lines
4.7 KiB
Bash
Executable File
163 lines
4.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -e
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# enable debug mode if desired
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if [[ "${DEBUG}" == "true" ]]; then
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set -x
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fi
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log() {
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LEVEL="${1}"
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TO_LOG="${2}"
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WHITE='\033[1;37m'
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YELLOW='\033[1;33m'
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RED='\033[1;31m'
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NO_COLOR='\033[0m'
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if [[ "${LEVEL}" == "warning" ]]; then
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LOG_LEVEL="${YELLOW}WARN${NO_COLOR}"
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elif [[ "${LEVEL}" == "error" ]]; then
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LOG_LEVEL="${RED}ERROR${NO_COLOR}"
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else
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LOG_LEVEL="${WHITE}INFO${NO_COLOR}"
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if [[ -z "${TO_LOG}" ]]; then
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TO_LOG="${1}"
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fi
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fi
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echo -e "[${LOG_LEVEL}] ${TO_LOG}"
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}
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ensure_mod() {
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FILE="${1}"
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MOD="${2}"
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U_ID="${3}"
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G_ID="${4}"
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chmod "${MOD}" "${FILE}"
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chown "${U_ID}"."${G_ID}" "${FILE}"
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}
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generate_passwd() {
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hexdump -e '"%02x"' -n 16 /dev/urandom
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}
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# ensure backward comaptibility for earlier versions of this image
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if [[ -n "${KEYPAIR_LOGIN}" ]] && [[ "${KEYPAIR_LOGIN}" == "true" ]]; then
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ROOT_KEYPAIR_LOGIN_ENABLED="${KEYPAIR_LOGIN}"
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fi
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if [[ -n "${ROOT_PASSWORD}" ]]; then
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ROOT_LOGIN_UNLOCKED="true"
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fi
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# enable root login if keypair login is enabled
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if [[ "${ROOT_KEYPAIR_LOGIN_ENABLED}" == "true" ]]; then
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ROOT_LOGIN_UNLOCKED="true"
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fi
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# initiate default sshd-config if there is none available
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if [[ ! "$(ls -A /etc/ssh)" ]]; then
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cp -a "${CACHED_SSH_DIRECTORY}"/* /etc/ssh/.
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fi
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rm -rf "${CACHED_SSH_DIRECTORY}"
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# generate host keys if not present
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ssh-keygen -A 1>/dev/null
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log "Applying configuration for 'root' user ..."
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if [[ "${ROOT_LOGIN_UNLOCKED}" == "true" ]] ; then
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# generate random root password
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if [[ -z "${ROOT_PASSWORD}" ]]; then
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log " generating random password for user 'root'"
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ROOT_PASSWORD="$(generate_passwd)"
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fi
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echo "root:${ROOT_PASSWORD}" | chpasswd &>/dev/null
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log " password for user 'root' set"
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log "warning" " user 'root' is now UNLOCKED"
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# set root login mode by password or keypair
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if [[ "${ROOT_KEYPAIR_LOGIN_ENABLED}" == "true" ]] && [[ -f "${HOME}/.ssh/authorized_keys" ]]; then
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sed -i "s/#PermitRootLogin.*/PermitRootLogin without-password/" /etc/ssh/sshd_config
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sed -i "s/#PasswordAuthentication.*/PasswordAuthentication no/" /etc/ssh/sshd_config
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ensure_mod "${HOME}/.ssh/authorized_keys" "0600" "root" "root"
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log " enabled login by keypair and disabled password-login for user 'root'"
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else
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sed -i "s/#PermitRootLogin.*/PermitRootLogin\ yes/" /etc/ssh/sshd_config
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log " enabled login by password for user 'root'"
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fi
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else
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sed -i "s/#PermitRootLogin.*/PermitRootLogin no/" /etc/ssh/sshd_config
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log " disabled login for user 'root'"
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log " user 'root' is now LOCKED"
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fi
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printf "\n"
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log "Applying configuration for additional users ..."
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if [[ ! -x "${USER_LOGIN_SHELL}" ]]; then
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log "error" " can not allocate desired shell '${USER_LOGIN_SHELL}', falling back to '${USER_LOGIN_SHELL_FALLBACK}' ..."
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USER_LOGIN_SHELL="${USER_LOGIN_SHELL_FALLBACK}"
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fi
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log " desired shell is ${USER_LOGIN_SHELL}"
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if [[ -n "${SSH_USERS}" ]]; then
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IFS=","
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for USER in ${SSH_USERS}; do
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log " '${USER}'"
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USER_NAME="$(echo "${USER}" | cut -d ':' -f 1)"
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USER_UID="$(echo "${USER}" | cut -d ':' -f 2)"
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USER_GID="$(echo "${USER}" | cut -d ':' -f 3)"
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if [[ -z "${USER_NAME}" ]] || [[ -z "${USER_UID}" ]] || [[ -z "${USER_GID}" ]]; then
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log "error" " skipping invalid data '${USER_NAME}' - UID: '${USER_UID}' GID: '${USER_GID}'"
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continue
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fi
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getent group "${USER_GID}" &>/dev/null || addgroup -g "${USER_GID}" "${USER_NAME}"
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getent passwd "${USER_NAME}" &>/dev/null || adduser -s "${USER_LOGIN_SHELL}" -D -u "${USER_UID}" -G "${USER_NAME}" "${USER_NAME}"
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passwd -u "${USER_NAME}" &>/dev/null
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mkdir -p "/home/${USER_NAME}/.ssh"
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log " user '${USER_NAME}' created - UID: '${USER_UID}' GID: '${USER_GID}'"
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MOUNTED_AUTHORIZED_KEYS="${AUTHORIZED_KEYS_VOLUME}/${USER_NAME}"
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LOCAL_AUTHORIZED_KEYS="/home/${USER_NAME}/.ssh/authorized_keys"
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if [[ ! -e "${MOUNTED_AUTHORIZED_KEYS}" ]]; then
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log "warning" " no SSH authorized_keys found for user '${USER_NAME}'"
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else
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cp "${MOUNTED_AUTHORIZED_KEYS}" "${LOCAL_AUTHORIZED_KEYS}"
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log " copied ${MOUNTED_AUTHORIZED_KEYS} to ${LOCAL_AUTHORIZED_KEYS}"
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ensure_mod "${LOCAL_AUTHORIZED_KEYS}" "0600" "${USER_NAME}" "${USER_GID}"
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log " set mod 0600 on ${LOCAL_AUTHORIZED_KEYS}"
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fi
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printf "\n"
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done
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unset IFS
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else
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log " no additional SSH-users set"
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fi
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echo ""
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# do not detach (-D), log to stderr (-e), passthrough other arguments
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exec /usr/sbin/sshd -D -e "$@" |