V8.00.000.2025.06.17

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

includes/target/etc/chrony/chrony.cnf

@@ -30,4 +30,6 @@ maxupdateskew 100.0
 
 rtcsync
 
-makestep 1 3
+makestep 0.25 3
+
+# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=conf

includes/target/etc/skel/.ciss/check_chrony.sh

@@ -0,0 +1,142 @@
+#!/bin/bash
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2025-10-10; WEIDNER, Marc S.; <msw@coresecret.dev>
+# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.git
+# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
+# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
+# SPDX-FileType: SOURCE
+# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
+# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
+# SPDX-PackageName: CISS.debian.live.builder
+# SPDX-Security-Contact: security@coresecret.eu
+
+set -Ceuo pipefail
+
+#######################################
+# Minimal leap-second probe for Debian/chrony systems.
+# - Prints kernel leap flags & TAI offset (ΔAT).
+# - Reads tzdata's leap-seconds list (authoritative TAI-UTC).
+# - Shows chrony tracking summary (incl. leap status).
+# - Demonstrates 23:59:60 rendering via TZ=right/UTC.
+# Globals:
+#   None
+# Arguments:
+#   None
+# Returns:
+#   0: on success
+#######################################
+main() {
+  ### 1) System TZ and tzdata source.
+  printf "System TZ link: [%s]\n\n" "$(readlink -f /etc/localtime || true)"
+
+  if [[ -f /usr/share/zoneinfo/leap-seconds.list ]]; then
+
+    declare tz_leap_line tz_tai tz_ntp ts_human
+
+    tz_leap_line="$(awk '($1 !~ /^#/) {L=$0} END{print L}' /usr/share/zoneinfo/leap-seconds.list)"
+    tz_ntp="$(awk '{print $1}' <<<"${tz_leap_line}")"
+    tz_tai="$(awk '{print $2}' <<<"${tz_leap_line}")"
+    ts_human="$(awk -F'#' '{gsub(/^[[:space:]]+/, "", $2); print $2}' <<<"${tz_leap_line}")"
+
+    printf "tzdata ΔAT (TAI-UTC): %s s [last change at: %s; NTP ts: %s]\n\n" "${tz_tai:-?}" "${ts_human:-?}" "${tz_ntp:-?}"
+
+  else
+
+    printf "tzdata leap-seconds.list not found.\n"
+
+  fi
+
+  ### 2) Kernel view (requires adjtimex).
+  if command -v adjtimex >/dev/null 2>&1; then
+
+    printf "Kernel time status (adjtimex -p):\n"
+    adjtimex -p | sed 's/^/  /'
+    declare k_tai
+    k_tai="$(adjtimex -p | awk '/^tai:/ {print $2}')"
+
+    if [[ -n "${k_tai:-}" ]]; then
+
+      printf "Kernel-exported ΔAT [tai]: %s s\n" "${k_tai}"
+
+    fi
+
+  else
+
+    printf "Package: 'adjtimex' not found. Install 'adjtimex' for kernel leap/TAI details.\n\n"
+
+  fi
+
+  ### 3) Chrony summary.
+  if command -v chronyc >/dev/null 2>&1; then
+
+    printf "\n"
+    printf "chronyc tracking:\n"
+    chronyc -n tracking | sed 's/^/  /'
+
+  else
+
+    printf "Package: 'chronyc' not found. Skipping chrony status.\n\n"
+
+  fi
+
+  ### 4) right/UTC demonstration of 23:59:60 (uses 2016-12-31 leap).
+  if [[ -f /usr/share/zoneinfo/right/UTC ]]; then
+
+    printf "\n"
+    printf "right/UTC leap rendering check (expect 23:59:60):\n\n"
+    TZ=right/UTC date -ud '2017-01-01 00:00:00 -1 second' || true
+
+  else
+
+    printf "\n"
+    printf "File: 'tzdata right/UTC' zone not installed; skipping 23:59:60 demo.\n\n"
+
+  fi
+
+  printf "\n"
+  printf "Hint:\n"
+
+  printf "  • ΔAT (TAI-UTC) should match tzdata and kernel (chrony sets kernel TAI if leapsectz/leapseclist is used).\n"
+  printf "  • For monotonic intervals, apps must use CLOCK_MONOTONIC, not CLOCK_REALTIME.\n"
+
+  return 0
+}
+
+### Build right/UTC from tzdata leap table if missing.
+if [[ ! -e /usr/share/zoneinfo/right/UTC ]]; then
+
+  install -d -m 0755 /usr/share/zoneinfo/right
+
+  ### Minimal zic source for a fixed UTC zone.
+  declare -r tmp_src="/tmp/UTC.src"
+  printf 'Zone UTC  0  -  UTC\n' > "${tmp_src}"
+
+  ### Prefer the zic-format leapseconds file.
+  declare leap_zic="/usr/share/zoneinfo/leapseconds"
+
+  if [[ -s "${leap_zic}" ]]; then
+
+    zic -d /usr/share/zoneinfo/right -L "${leap_zic}" "${tmp_src}"
+
+  else
+
+    echo "WARNING: ${leap_zic} not found; building right/UTC without leap info." >&2
+    zic -d /usr/share/zoneinfo/right -L /dev/null "${tmp_src}"
+
+  fi
+
+  rm -f "${tmp_src}"
+
+fi
+
+if [[ -e /usr/share/zoneinfo/right/UTC ]]; then
+
+  ### Expect to see 'Sat Dec 31 23:59:60 UTC 2016' rendered in right/UTC
+  TZ=right/UTC date -ud '2017-01-01 00:00:00 -1 second' || true
+
+fi
+
+main "$@"
+
+exit 0
+# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh

includes/target/etc/ssh/sshd_config

@@ -64,12 +64,12 @@ GatewayPorts                 no
 ### A+ Rating 100/100
 RequiredRSASize              4096
 Ciphers                      aes256-gcm@openssh.com
-KexAlgorithms                sntrup761x25519-sha512@openssh.com,sntrup761x25519-sha512,gss-curve25519-sha256-
-HostKeyAlgorithms            sk-ssh-ed25519-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-256
+KexAlgorithms                mlkem768x25519-sha256,sntrup761x25519-sha512@openssh.com,sntrup761x25519-sha512
+HostKeyAlgorithms            ssh-ed25519-cert-v01@openssh.com,ssh-ed25519,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-256
 MACs                         hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com
-CASignatureAlgorithms        rsa-sha2-512,rsa-sha2-256,ssh-ed25519,sk-ssh-ed25519@openssh.com
+CASignatureAlgorithms        rsa-sha2-512,rsa-sha2-256,ssh-ed25519
 GSSAPIKexAlgorithms          gss-curve25519-sha256-,gss-group16-sha512-
-HostbasedAcceptedAlgorithms  sk-ssh-ed25519-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-256
+HostbasedAcceptedAlgorithms  ssh-ed25519-cert-v01@openssh.com,ssh-ed25519,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-256
 PubkeyAcceptedAlgorithms     sk-ssh-ed25519-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-256
 
 ### Change to yes to enable challenge-response passwords (beware issues with some PAM modules and threads)