Marc S. Weidner
9221726408
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
118 lines
4.9 KiB
Bash
118 lines
4.9 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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# Hardening accounts: Google TOTP, Wordlists, masking ttys, expiration of accounts.
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# Globals:
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# RECOVERY
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# TARGET
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# VAR_RUN_RECOVERY
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# VAR_SETUP_PATH
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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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accounts_hardening() {
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### Declare Arrays, HashMaps, and Variables.
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declare -a ary_security_pkgs=()
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declare -r var_logfile="/root/.ciss/cdi/log/4510_accounts_hardening.log"
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declare var_target="${TARGET}"
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### Check for TARGET / RECOVERY.
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[[ "${VAR_RUN_RECOVERY}" == "true" ]] && var_target="${RECOVERY}"
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chroot_logger "${var_target}${var_logfile}"
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### Installing Google TOTP, Wordlists.
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ary_security_pkgs=( "libpam-google-authenticator" "wamerican" "wbritish" "wfrench" "wngerman" )
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chroot_script "${var_target}" "
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export INITRD=No
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[[ -r /root/ciss_xdg_tmp.sh ]] && . /root/ciss_xdg_tmp.sh
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apt-get install -y --no-install-recommends --no-install-suggests ${ary_security_pkgs[*]} 2>&1 | tee -a ${var_logfile}
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"
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### Preparing 2fa hardening.
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install -d -m 0755 -o root -g root "${var_target}/etc/ciss"
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insert_header "${var_target}/etc/ciss/2fa.map"
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insert_comments "${var_target}/etc/ciss/2fa.map"
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chmod 0644 "${var_target}/etc/ciss/2fa.map"
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### Keep 'tty1' active, disable the rest.
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# shellcheck disable=SC2016
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chroot_script "${var_target}" '
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systemctl unmask getty@tty1.service
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systemctl enable getty@tty1.service
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for t in tty2 tty3 tty4 tty5 tty6; do
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systemctl mask getty@${t}.service
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done
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systemctl mask serial-getty@.service
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'
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chroot_script "${var_target}" "
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if [[ ! -f /etc/securetty ]]; then
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touch /etc/securetty
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chmod 0600 /etc/securetty
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chown root:root /etc/securetty
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fi
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"
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### Hardening file permissions.
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chown root:root "${var_target}/etc/passwd" "${var_target}/etc/group"
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chown root:shadow "${var_target}/etc/shadow" "${var_target}/etc/gshadow"
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chmod 0644 "${var_target}/etc/passwd" "${var_target}/etc/group"
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chmod 0640 "${var_target}/etc/shadow" "${var_target}/etc/gshadow"
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chmod 0600 "${var_target}/etc/security/access.conf"
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### Hardening '/etc/login.defs'.
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mkdir -p "${var_target}/root/.ciss/cdi/backup/etc"
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mv "${var_target}/etc/login.defs" "${var_target}/root/.ciss/cdi/backup/etc/login.defs.bak"
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insert_header "${var_target}/etc/login.defs"
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insert_comments "${var_target}/etc/login.defs"
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cat "${VAR_SETUP_PATH}/includes/target/etc/login.defs" >> "${var_target}/etc/login.defs"
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### Hardening '/etc/security/pwquality.conf'.
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mkdir -p "${var_target}/root/.ciss/cdi/backup/etc/security"
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mv "${var_target}/etc/security/pwquality.conf" "${var_target}/root/.ciss/cdi/backup/etc/security/pwquality.conf.bak"
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insert_header "${var_target}/etc/security/pwquality.conf"
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insert_comments "${var_target}/etc/security/pwquality.conf"
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cat "${VAR_SETUP_PATH}/includes/target/etc/security/pwquality.cnf" >> "${var_target}/etc/security/pwquality.conf"
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### Hardening '/etc/security/access.conf'.
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mv "${var_target}/etc/security/access.conf" "${var_target}/root/.ciss/cdi/backup/etc/security/access.conf.bak"
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insert_header "${var_target}/etc/security/access.conf"
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insert_comments "${var_target}/etc/security/access.conf"
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cat "${VAR_SETUP_PATH}/includes/target/etc/security/access.cnf" >> "${var_target}/etc/security/access.conf"
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### Hardening password expiration; defaults to 16,384 days.
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install -m 0700 -o root -g root "${VAR_SETUP_PATH}/includes/chroot/hooks/4510_password_expiration.hooks.sh" \
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"${var_target}/root/.ciss/cdi/hooks/4510_password_expiration.hooks.sh"
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if ! chroot_script "${var_target}" "/root/.ciss/cdi/hooks/4510_password_expiration.hooks.sh" "emergency"; then
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do_log "warn" "file_only" "4510() Command: [chroot_script ${var_target} /root/.ciss/cdi/hooks/4510_password_expiration.hooks.sh emergency] failed."
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else
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do_log "debug" "file_only" "4510() Command: [chroot_script ${var_target} /root/.ciss/cdi/hooks/4510_password_expiration.hooks.sh emergency] successful."
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fi
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guard_dir && return 0
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}
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### Prevents accidental 'unset -f'.
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# shellcheck disable=SC2034
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readonly -f accounts_hardening
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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