V9.14.022.2026.06.10

Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
2026-06-10 17:57:31 +01:00
parent ae87d7ac54
commit 800cd175fc
55 changed files with 379 additions and 75 deletions
@@ -13,6 +13,8 @@
 set -Ceuo pipefail
 umask 0077

+declare -gx   VAR_RDNS_DOMAIN=""             # Forward-confirmed reverse DNS domain.
+declare -gx   VAR_RDNS_IPV4=""               # IPv4 address used for RDNS verification.
 declare -grx  VAR_SEMAPHORE="/root/cdi.ciss" # Semaphore to appear.
 declare -girx VAR_TIMEOUT=3600               # Semaphore timer in seconds.

@@ -90,6 +92,238 @@ net_wait() {
 # shellcheck disable=SC2034
 readonly -f net_wait

+#######################################
+# Validate an IPv4 address.
+# Globals:
+#   None
+# Arguments:
+#   $1: IPv4 address
+# Returns:
+#   0: valid IPv4 address
+#   1: invalid IPv4 address
+#######################################
+is_ipv4() {
+  ### Declare Arrays, HashMaps, and Variables.
+  declare -r var_ip="${1:-}"
+  declare -a ary_octets=()
+  declare     var_octet=""
+
+  [[ "${var_ip}" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}$ ]] || return 1
+
+  IFS='.' read -r -a ary_octets <<< "${var_ip}"
+
+  for var_octet in "${ary_octets[@]}"; do
+
+    if ! ((10#${var_octet} <= 255)); then
+
+      return 1
+
+    fi
+
+  done
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f is_ipv4
+
+#######################################
+# Validate a DNS domain name returned by RDNS.
+# Globals:
+#   None
+# Arguments:
+#   $1: domain name
+# Returns:
+#   0: valid domain name
+#   1: invalid domain name
+#######################################
+is_dns_name() {
+  ### Declare Arrays, HashMaps, and Variables.
+  declare -r var_name="${1:-}"
+
+  [[ "${#var_name}" -le 253 ]] || return 1
+  [[ "${var_name}" =~ ^[A-Za-z0-9]([A-Za-z0-9-]{0,61}[A-Za-z0-9])?(\.[A-Za-z0-9]([A-Za-z0-9-]{0,61}[A-Za-z0-9])?)+$ ]] \
+    || return 1
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f is_dns_name
+
+#######################################
+# Retrieve and forward-confirm reverse DNS for the active IPv4 route.
+# Globals:
+#   VAR_RDNS_DOMAIN
+#   VAR_RDNS_IPV4
+# Arguments:
+#   $1: module log file
+# Returns:
+#   0: on confirmed RDNS
+#   1: on missing or unconfirmed RDNS
+#######################################
+# retrieve_rdns() intentionally probes optional resolver tools and validation helpers inside conditionals.
+# shellcheck disable=SC2310,SC2312
+retrieve_rdns() {
+  ### Declare Arrays, HashMaps, and Variables.
+  declare -r var_log="${1:-}"
+  declare -a ary_a=()
+  declare -a ary_rdns=()
+  declare -a ary_targets=()
+  declare    var_a="" var_ipv4="" var_rdns="" var_target=""
+
+  VAR_RDNS_DOMAIN=""
+  VAR_RDNS_IPV4=""
+
+  mapfile -t ary_targets < <(
+    getent ahostsv4 git.coresecret.dev 2>/dev/null \
+      | awk '/^([0-9]{1,3}\.){3}[0-9]{1,3}[[:space:]]/ && !seen[$1]++ { print $1 }'
+  )
+  ary_targets+=( "1.1.1.1" "9.9.9.9" "8.8.8.8" )
+
+  if command -v ip >/dev/null 2>&1; then
+
+    for var_target in "${ary_targets[@]}"; do
+
+      if var_ipv4="$(
+        ip -o -4 route get "${var_target}" 2>/dev/null \
+          | awk '{ for (i = 1; i <= NF; i++) { if ($i == "src") { print $(i + 1); exit } } }'
+      )" && is_ipv4 "${var_ipv4}"; then
+
+        break
+
+      fi
+
+      var_ipv4=""
+
+    done
+
+    if [[ -z "${var_ipv4}" ]]; then
+
+      mapfile -t ary_targets < <(
+        ip -o -4 addr show scope global up 2>/dev/null \
+          | awk '{ split($4, addr, "/"); if (!seen[addr[1]]++) { print addr[1] } }'
+      )
+
+      for var_target in "${ary_targets[@]}"; do
+
+        if is_ipv4 "${var_target}"; then
+
+          var_ipv4="${var_target}"
+          break
+
+        fi
+
+      done
+
+    fi
+
+  fi
+
+  if [[ -z "${var_ipv4}" ]]; then
+
+    logger -t cdi-watcher "retrieve_rdns(): no active IPv4 address found; continuing without RDNS."
+    printf "Command: [retrieve_rdns] no active IPv4 address found; continuing without RDNS.\n" >> "${var_log}"
+    return 1
+
+  fi
+
+  if command -v dig >/dev/null 2>&1; then
+
+    mapfile -t ary_rdns < <(
+      dig +time=3 +tries=1 +short -x "${var_ipv4}" 2>/dev/null \
+        | sed 's/[.]$//' \
+        | awk 'NF && !seen[$0]++ { print $0 }'
+    )
+
+  fi
+
+  if ((${#ary_rdns[@]} == 0)) && command -v host >/dev/null 2>&1; then
+
+    mapfile -t ary_rdns < <(
+      host "${var_ipv4}" 2>/dev/null \
+        | awk '/domain name pointer/ { sub(/[.]$/, "", $NF); if (!seen[$NF]++) { print $NF } }'
+    )
+
+  fi
+
+  if ((${#ary_rdns[@]} == 0)); then
+
+    mapfile -t ary_rdns < <(
+      getent hosts "${var_ipv4}" 2>/dev/null \
+        | awk '{ for (i = 2; i <= NF; i++) { sub(/[.]$/, "", $i); if (!seen[$i]++) { print $i } } }'
+    )
+
+  fi
+
+  for var_rdns in "${ary_rdns[@]}"; do
+
+    var_rdns="${var_rdns%.}"
+    var_rdns="${var_rdns,,}"
+
+    if ! is_dns_name "${var_rdns}"; then
+
+      continue
+
+    fi
+
+    ary_a=()
+
+    if command -v dig >/dev/null 2>&1; then
+
+      mapfile -t ary_a < <(
+        dig +time=3 +tries=1 +short A "${var_rdns}" 2>/dev/null \
+          | awk '/^([0-9]{1,3}\.){3}[0-9]{1,3}$/ && !seen[$0]++ { print $0 }'
+      )
+
+    fi
+
+    if ((${#ary_a[@]} == 0)) && command -v host >/dev/null 2>&1; then
+
+      mapfile -t ary_a < <(
+        host -t A "${var_rdns}" 2>/dev/null \
+          | awk '/ has address / && !seen[$NF]++ { print $NF }'
+      )
+
+    fi
+
+    if ((${#ary_a[@]} == 0)); then
+
+      mapfile -t ary_a < <(
+        getent ahostsv4 "${var_rdns}" 2>/dev/null \
+          | awk '!seen[$1]++ { print $1 }'
+      )
+
+    fi
+
+    for var_a in "${ary_a[@]}"; do
+
+      if is_ipv4 "${var_a}" && [[ "${var_a}" == "${var_ipv4}" ]]; then
+
+        VAR_RDNS_IPV4="${var_ipv4}"
+        VAR_RDNS_DOMAIN="${var_rdns}"
+        logger -t cdi-watcher "retrieve_rdns(): confirmed IPv4 ${VAR_RDNS_IPV4} RDNS ${VAR_RDNS_DOMAIN}."
+        printf "Command: [retrieve_rdns] confirmed IPv4 [%s] RDNS [%s].\n" \
+          "${VAR_RDNS_IPV4}" "${VAR_RDNS_DOMAIN}" >> "${var_log}"
+        return 0
+
+      fi
+
+    done
+
+  done
+
+  logger -t cdi-watcher "retrieve_rdns(): no forward-confirmed RDNS for IPv4 ${var_ipv4}; continuing without RDNS."
+  printf "Command: [retrieve_rdns] no forward-confirmed RDNS for IPv4 [%s]; continuing without RDNS.\n" \
+    "${var_ipv4}" >> "${var_log}"
+
+  return 1
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f retrieve_rdns
+
 #######################################
 # Wrapper for loading CISS hardened Kernel Parameters.
 # Globals:
@@ -130,7 +364,7 @@ main() {
  touch "${var_log}"


-  printf "CISS.debian.installer Master V9.14.020.2026.06.08 is up! \n" >> "${var_log}"
+  printf "CISS.debian.live.builder V9.14.022.2026.06.10 calling CISS.debian.installer ... \n" >> "${var_log}"

  ### Sleep a moment to settle boot artifacts.
  sleep 8
@@ -153,6 +387,12 @@ main() {
  fi
  printf "Command: [net_wait] executed.\n" >> "${var_log}"

+  ### Retrieve forward-confirmed reverse DNS.
+  printf "Command: [retrieve_rdns] to be executed ... \n" >> "${var_log}"
+  # shellcheck disable=SC2310
+  retrieve_rdns "${var_log}" || true
+  printf "Command: [retrieve_rdns] executed.\n" >> "${var_log}"
+
  ### apt update.
  if ! apt-get update >> "${var_log}"; then

@@ -209,7 +449,7 @@ main() {

  ### Timeout reached without acceptable semaphore.
  logger -t cdi-watcher "No valid semaphore ${VAR_SEMAPHORE} (mode 0600) within ${VAR_TIMEOUT}s; exiting idle."
-  printf "CISS.debian.installer Master V9.14.020.2026.06.08: No valid semaphore [%s] within [%s]s.\n" "${VAR_SEMAPHORE}" "${VAR_TIMEOUT}" >> "${var_log}"
+  printf "CISS.debian.live.builder V9.14.022.2026.06.10: No valid semaphore [%s] within [%s]s.\n" "${VAR_SEMAPHORE}" "${VAR_TIMEOUT}" >> "${var_log}"

  exit 0
 }