V8.13.404.2025.11.10

Signed-off-by: Marc S. Weidner <msw@coresecret.dev>

config/hooks/live/9992_password_expiration.chroot

@@ -10,6 +10,87 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu
 set -Ceuo pipefail
+#######################################
+# Iterates all '/etc/shadow' entries and sets:
+#   4=min age=0, 5=max age=16384, 6=warn=128, 7=inactive=42, 8=expire=17.09.2102
+#   Safe: creates a timestamped backup and (if available) locks '/etc/.pwd.lock'.
+# Globals:
+#   RECOVERY
+#   TARGET
+#   VAR_RUN_RECOVERY
+# Arguments:
+#   None
+# Returns:
+#   0: on success
+#######################################
+update_shadow() {
+  ### Declare Arrays, HashMaps, and Variables.
+
+  declare -r  var_shadow="/etc/shadow"
+  declare -r  var_backup="/root/.ciss/cdlb/backup/etc/shadow.$(date +%s).bak"
+  declare -r  var_temp="${var_shadow}.new.$$"
+  declare -r  var_exp_dt="17.09.2102"
+  declare     var_exp_ds=""
+
+  mkdir -p "/root/.ciss/cdlb/backup/etc"
+
+  var_exp_ds="$(
+    awk -v d="${var_exp_dt}" 'BEGIN{
+      # Force UTC to avoid DST/timezone off-by-one errors
+      ENVIRON["TZ"]="UTC";
+      if (match(d, /^([0-9]{2})\.([0-9]{2})\.([0-9]{4})$/, a)) {
+        dd=a[1]+0; mm=a[2]+0; yyyy=a[3]+0;
+        sec = mktime(sprintf("%04d %02d %02d 00 00 00 0", yyyy, mm, dd));
+        if (sec < 0) { print "ERR"; exit 1 }
+        print int(sec/86400);
+        exit 0
+      } else { print "ERR"; exit 1 }
+    }'
+  )" || return 42
+
+  # shellcheck disable=SC2249
+  case "${var_exp_ds}" in
+
+    ''|*ERR*)
+      return 127
+      ;;
+
+  esac
+
+  umask 0077
+  cp --preserve=mode,ownership "${var_shadow}" "${var_backup}"
+
+  ### Rewrite fields 4..8 for every line
+  ### Preserve fields 1..3 and 9, keep password hashes untouched.
+  ### Pad to 9 fields if shorter; keep empty lines intact (rare but safe).
+  awk -v FS=":" -v OFS=":" -v v_exp="${var_exp_ds}" '
+    NF==0 { print; next }                      # preserve blank lines verbatim
+    {
+      # pad missing trailing fields to 9
+      for (i=NF+1; i<=9; i++) $i="";
+      $4=0; $5=16384; $6=128; $7=42; $8=v_exp; # set required fields
+      print
+    }
+  ' "${var_backup}" >| "${var_temp}"
+
+  ### Defensive: ensure non-empty output.
+  if [[ ! -s "${var_temp}" ]]; then
+    rm -f "${var_temp}"
+    return 42
+  fi
+
+  ### Preserve owner/mode (fallback to 0640 root:shadow if reference fails).
+  chown --reference="${var_shadow}" "${var_temp}" 2>/dev/null || chown root:shadow "${var_temp}" 2>/dev/null || true
+  chmod --reference="${var_shadow}" "${var_temp}" 2>/dev/null || chmod 0640 "${var_temp}" 2>/dev/null || true
+
+  ### Atomic replace.
+  mv -f "${var_temp}" "${var_shadow}"
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f update_shadow
 
 printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 '%s' starting ... \e[0m\n" "${0}"
 
@@ -49,6 +130,8 @@ awk -F: '$2 !~ /^\$[0-9]/ && length($2)==13 { print $1,$2 }' /etc/shadow
 
 printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ All applicable accounts have been updated. \e[0m\n"
 
+update_shadow
+
 printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ '%s' applied successfully. \e[0m\n" "${0}"
 
 exit 0