V8.00.000.2025.06.17

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

func/4180_setup_ssh.sh

@@ -0,0 +1,86 @@
+#!/bin/bash
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2025-06-17; WEIDNER, Marc S.; <msw@coresecret.dev>
+# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.installer.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.installer
+# SPDX-Security-Contact: security@coresecret.eu
+
+guard_sourcing
+
+#######################################
+# Setup ssh server.
+# Globals:
+#   DIR_BAK
+#   DIR_LOG
+#   TARGET
+#   VAR_FINAL_FQDN
+#   VAR_FINAL_IPV4
+#   VAR_FINAL_IPV6
+#   VAR_SETUP_PATH
+#   user_ssh_port
+#   user_user0_name
+# Arguments:
+#   None
+# Returns:
+#   0: Successfully executed commands.
+#######################################
+setup_ssh() {
+  do_in_target "${TARGET}" apt-get install -y ssh
+
+  rm -rf "${TARGET}/etc/ssh/ssh_host_*key*"
+
+  do_in_target "${TARGET}" ssh-keygen -o -N "" -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -C "root@${VAR_FINAL_FQDN}-$(date -I)"
+  do_log "info" "true" "Generated ed25519 SSH Key, executed in: '${TARGET}'."
+
+  do_in_target "${TARGET}" ssh-keygen -o -N "" -t rsa -b 4096 -f /etc/ssh/ssh_host_rsa_key -C "root@${VAR_FINAL_FQDN}-$(date -I)"
+  do_log "info" "true" "Generated RSA4096 SSH Key, executed in: '${TARGET}'."
+
+
+  mkdir -p "${DIR_BAK}/etc/ssh"
+  cp "${TARGET}/etc/ssh/sshd_config" "${DIR_BAK}/etc/ssh/sshd_config.bak"
+  chmod 0644 "${DIR_BAK}/etc/ssh/sshd_config.bak"
+  cp "${TARGET}/etc/ssh/ssh_config" "${DIR_BAK}/etc/ssh/ssh_config.bak"
+  chmod 0644 "${DIR_BAK}/etc/ssh/ssh_config.bak"
+
+  rm "${TARGET}/etc/ssh/sshd_config"
+
+  cp "${VAR_SETUP_PATH}/includes/etc/ssh/sshd_config" "${TARGET}/etc/ssh/sshd_config"
+  chmod 0600 "${TARGET}/etc/ssh/sshd_config"
+  chmod 0600 "${TARGET}/etc/ssh/ssh_config"
+
+  sed -i "s/ListenAddress                0.0.0.0/ListenAddress                ${VAR_FINAL_IPV4}/" "${TARGET}/etc/ssh/sshd_config"
+
+  if [[ -n "${VAR_FINAL_IPV6}" ]]; then
+    sed -i "s/ListenAddress                ::/ListenAddress                ${VAR_FINAL_IPV6}/" "${TARGET}/etc/ssh/sshd_config"
+  else
+    sed -i "/^\s*ListenAddress\s*::/d" "${TARGET}/etc/ssh/sshd_config"
+  fi
+
+  sed -i "s/Port                         MUST_BE_CHANGED/Port                         ${user_ssh_port}/" "${TARGET}/etc/ssh/sshd_config"
+
+  if [[ -n "${user_user0_name,,}" ]]; then
+    sed -i "s/AllowUsers                   root/AllowUsers                   root ${user_user0_name}/" "${TARGET}/etc/ssh/sshd_config"
+  fi
+
+  do_in_target "${TARGET}" sshd -T >| "${DIR_LOG}/sshd_config.log"
+  do_in_target "${TARGET}" ssh-keygen -r "${VAR_FINAL_FQDN}." >| "${DIR_LOG}/ssh.log"
+
+  ###########################################################################################
+  # The file /etc/profile.d/idle-users.sh is created to set two read-only                   #
+  # environment variables: TMOUT and HISTFILE.                                              #
+  # TMOUT=14400 ensures that users are automatically logged out after 4 hours of inactivity.#
+  # readonly HISTFILE ensures that the command history cannot be changed.                   #
+  # The chmod +x command ensures that the file is executed in every shell session.          #
+  ###########################################################################################
+  echo "readonly TMOUT=14400" >| "${TARGET}/etc/profile.d/idle-users.sh"
+  #echo "readonly HISTFILE" >> "${TARGET}/etc/profile.d/idle-users.sh"
+  chmod +x "${TARGET}/etc/profile.d/idle-users.sh"
+
+  return 0
+}
+# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh