Marc S. Weidner
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
139 lines
4.4 KiB
Bash
139 lines
4.4 KiB
Bash
#!/bin/bash
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-10-11; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.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.live.builder
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# SPDX-Security-Contact: security@coresecret.eu
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set -Ceuo pipefail
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#######################################
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# Iterates all '/etc/shadow' entries and sets:
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# 4=min age=0, 5=max age=16384, 6=warn=128, 7=inactive=42, 8=expire=17.09.2102
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# Safe: creates a timestamped backup and (if available) locks '/etc/.pwd.lock'.
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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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# 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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update_shadow() {
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### Declare Arrays, HashMaps, and Variables.
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declare -r var_shadow="/etc/shadow"
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declare -r var_backup="/root/.ciss/cdlb/backup/etc/shadow.$(date +%s).bak"
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declare -r var_temp="${var_shadow}.new.$$"
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declare -r var_exp_dt="17.09.2102"
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declare var_exp_ds=""
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mkdir -p "/root/.ciss/cdlb/backup/etc"
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var_exp_ds="$(
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awk -v d="${var_exp_dt}" 'BEGIN{
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# Force UTC to avoid DST/timezone off-by-one errors
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ENVIRON["TZ"]="UTC";
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if (match(d, /^([0-9]{2})\.([0-9]{2})\.([0-9]{4})$/, a)) {
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dd=a[1]+0; mm=a[2]+0; yyyy=a[3]+0;
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sec = mktime(sprintf("%04d %02d %02d 00 00 00 0", yyyy, mm, dd));
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if (sec < 0) { print "ERR"; exit 1 }
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print int(sec/86400);
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exit 0
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} else { print "ERR"; exit 1 }
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}'
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)" || return 42
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# shellcheck disable=SC2249
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case "${var_exp_ds}" in
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''|*ERR*)
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return 127
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;;
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esac
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umask 0077
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cp --preserve=mode,ownership "${var_shadow}" "${var_backup}"
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### Rewrite fields 4..8 for every line
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### Preserve fields 1..3 and 9, keep password hashes untouched.
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### Pad to 9 fields if shorter; keep empty lines intact (rare but safe).
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awk -v FS=":" -v OFS=":" -v v_exp="${var_exp_ds}" '
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NF==0 { print; next } # preserve blank lines verbatim
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{
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# pad missing trailing fields to 9
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for (i=NF+1; i<=9; i++) $i="";
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$4=0; $5=16384; $6=128; $7=42; $8=v_exp; # set required fields
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print
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}
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' "${var_backup}" >| "${var_temp}"
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### Defensive: ensure non-empty output.
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if [[ ! -s "${var_temp}" ]]; then
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rm -f "${var_temp}"
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return 42
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fi
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### Preserve owner/mode (fallback to 0640 root:shadow if reference fails).
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chown --reference="${var_shadow}" "${var_temp}" 2>/dev/null || chown root:shadow "${var_temp}" 2>/dev/null || true
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chmod --reference="${var_shadow}" "${var_temp}" 2>/dev/null || chmod 0640 "${var_temp}" 2>/dev/null || true
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### Atomic replace.
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mv -f "${var_temp}" "${var_shadow}"
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return 0
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}
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### Prevents accidental 'unset -f'.
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# shellcheck disable=SC2034
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readonly -f update_shadow
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printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 '%s' starting ... \e[0m\n" "${0}"
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if ! command -v chage &>/dev/null; then
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ Info: 'chage' NOT found. Exiting hook ... \e[0m\n"
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ '%s' applied successfully. \e[0m\n" "${0}"
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exit 0
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fi
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declare -i max_days=16384
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# shellcheck disable=SC2312
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mapfile -t users_to_update < <(
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awk -F: '$2 !~ /^[!*]/ { print $1 }' /etc/shadow
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)
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if [[ ${#users_to_update[@]} -eq 0 ]]; then
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ No enabled-login accounts found in /etc/shadow. Exiting hook ... \e[0m\n"
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ '%s' applied successfully. \e[0m\n" "${0}"
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exit 0
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fi
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declare user
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for user in "${users_to_update[@]}"; do
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ Setting max password age for user '%s' to '%s' days. \e[0m\n" "${user}" "${max_days}"
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chage --maxdays "${max_days}" "${user}"
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done
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unset max_days user users_to_update
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awk -F: '$2 !~ /^\$[0-9]/ && length($2)==13 { print $1,$2 }' /etc/shadow
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ All applicable accounts have been updated. \e[0m\n"
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update_shadow
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ '%s' applied successfully. \e[0m\n" "${0}"
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exit 0
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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