113 lines
4.7 KiB
Bash
113 lines
4.7 KiB
Bash
#!/bin/bash
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-06-17; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.installer.git
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# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
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# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-FileType: SOURCE
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# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
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# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
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# SPDX-PackageName: CISS.debian.installer
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# SPDX-Security-Contact: security@coresecret.eu
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guard_sourcing
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#######################################
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# Setup ssh server.
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# Globals:
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# BASH_REMATCH
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# DIR_BAK
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# DIR_LOG
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# TARGET
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# VAR_FINAL_FQDN
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# VAR_FINAL_IPV4
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# VAR_FINAL_IPV6
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# VAR_SETUP_PATH
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# ssh_port
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# ssh_root_ca
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# Arguments:
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# None
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# Returns:
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# 0: on success
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#######################################
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setup_ssh() {
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do_in_target "${TARGET}" apt-get install -y ssh
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#######################################
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# Variable declaration
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#######################################
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declare -a ary_user=()
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declare -i i
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declare var_auth="" var_name=""
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install -D -m 0644 -o root -g root "${VAR_SETUP_PATH}/includes/etc/banner" "${TARGET}/etc/"
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install -D -m 0644 -o root -g root "${VAR_SETUP_PATH}/includes/etc/motd" "${TARGET}/etc/"
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do_log "info" "true" "Installed SSH banner and motd to '${TARGET}/etc/'."
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### Only process those for which both *_name and *_authentication_access_ssh are set.
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for ((i = 0; i <= VAR_USER_MAX; i++)); do
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var_auth="user_user${i}_authentication_access_ssh"
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var_name="user_user${i}_name"
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if [[ -v "${var_auth}" && -v "${var_name}" && "${!var_auth}" == "true" ]]; then
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ary_user+=("${!var_name}")
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fi
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done
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rm -rf "${TARGET}"/etc/ssh/ssh_host_*key*
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#shellcheck disable=SC2312
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do_in_target "${TARGET}" ssh-keygen -o -N "" -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -C "root@${VAR_FINAL_FQDN}-$(date -I)"
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#shellcheck disable=SC2312
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do_in_target "${TARGET}" ssh-keygen -o -N "" -t rsa -b 4096 -f /etc/ssh/ssh_host_rsa_key -C "root@${VAR_FINAL_FQDN}-$(date -I)"
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mkdir -p "${DIR_BAK}/etc/ssh"
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cp "${TARGET}/etc/ssh/sshd_config" "${DIR_BAK}/etc/ssh/sshd_config.bak"
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chmod 0644 "${DIR_BAK}/etc/ssh/sshd_config.bak"
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cp "${TARGET}/etc/ssh/ssh_config" "${DIR_BAK}/etc/ssh/ssh_config.bak"
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chmod 0644 "${DIR_BAK}/etc/ssh/ssh_config.bak"
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rm -f "${TARGET}/etc/ssh/sshd_config"
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install -D -m 0600 -o root -g root "${VAR_SETUP_PATH}/includes/etc/ssh/sshd_config" "${TARGET}/etc/ssh/sshd_config"
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chmod 0600 "${TARGET}/etc/ssh/ssh_config"
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# shellcheck disable=SC2153
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sed -i -E "s|^\s*ListenAddress\s+.*$|$(printf '%-30s%s' 'ListenAddress' "${VAR_FINAL_IPV4}")|" "${TARGET}/etc/ssh/sshd_config"
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if [[ -n "${VAR_FINAL_IPV6}" ]]; then
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sed -i -E "s|^\s*ListenAddress\s+::.*$|$(printf '%-30s%s' 'ListenAddress' "${VAR_FINAL_IPV6}")|" "${TARGET}/etc/ssh/sshd_config"
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else
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sed -i "/^\s*ListenAddress\s*::/d" "${TARGET}/etc/ssh/sshd_config"
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fi
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sed -i -E "s|^\s*Port\s+.*$|$(printf '%-30s%s' 'Port' "${ssh_port}")|" "${TARGET}/etc/ssh/sshd_config"
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if (( ${#ary_user[@]} > 0 )); then
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sed -i -E "s|^\s*AllowUsers\s+.*$|$(printf '%-30s%s' 'AllowUsers' "root ${ary_user[*]}")|" "${TARGET}/etc/ssh/sshd_config"
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fi
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if [[ -n "${ssh_root_ca}" ]]; then
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install -D -m 0644 -o root -g root "${VAR_SETUP_PATH}${ssh_root_ca}" "${TARGET}/etc/ssh/"
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sed -i -E "s|^\s*TrustedUserCAKeys\s+.*$|$(printf '%-30s%s' 'TrustedUserCAKeys' "/etc/ssh/${ssh_root_ca}")|" "${TARGET}/etc/ssh/sshd_config"
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fi
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do_in_target_script "${TARGET}" "sshd -T >| ${DIR_LOG}/sshd_config.log"
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do_in_target_script "${TARGET}" "ssh-keygen -r ${VAR_FINAL_FQDN}. >| ${DIR_LOG}/ssh.log"
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###########################################################################################
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# The file /etc/profile.d/idle-users.sh is created to set two read-only #
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# environment variables: TMOUT and HISTFILE. #
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# TMOUT=14400 ensures that users are automatically logged out after 4 hours of inactivity.#
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# readonly HISTFILE ensures that the command history cannot be changed. #
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# The chmod +x command ensures that the file is executed in every shell session. #
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###########################################################################################
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echo "readonly TMOUT=14400" >| "${TARGET}/etc/profile.d/idle-users.sh"
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# TODO: Decide: set HISTFILE=/dev/null or leave unset (readonly var requires value!)
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#echo "readonly HISTFILE" >> "${TARGET}/etc/profile.d/idle-users.sh"
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chmod +x "${TARGET}/etc/profile.d/idle-users.sh"
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return 0
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}
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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