186 lines
6.9 KiB
Bash
186 lines
6.9 KiB
Bash
#!/bin/bash
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-06-17; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.installer.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.installer
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# SPDX-Security-Contact: security@coresecret.eu
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guard_sourcing || return "${ERR_GUARD_SOURCE}"
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#######################################
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# Build Ultra Hardened dropbear from sources.
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# Globals:
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# TARGET
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# VAR_SETUP_PATH
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# Arguments:
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# None
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# Returns:
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# 0: on success
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# 126: on permission, noexec, or interpreter execution failure
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# 127: on missing build command
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# ERR_PATH_NOT_VALID: on failure
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#######################################
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dropbear_build() {
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### Declare Arrays, HashMaps, and Variables.
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declare var_dropbear_version="2026.91"
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declare var_tar="${VAR_SETUP_PATH}/upgrades/dropbear/dropbear-${var_dropbear_version}.tar.bz2"
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declare var_build_root="/opt/.ciss/build"
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declare var_build_dir="${var_build_root}/dropbear-${var_dropbear_version}"
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declare -r var_logfile="/root/.ciss/cdi/log/4310_dropbear_build.log"
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declare -r var_build_log="${TARGET}${var_logfile}"
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declare -r var_build_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
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declare var_command="" var_command_path="" var_configure_interpreter="" var_configure_shebang=""
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declare var_mount_options="" var_mount_target=""
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declare -a ary_required_commands=(bash setsid musl-gcc make nproc)
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chroot_logger "${var_build_log}"
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mkdir -p "${var_build_root}"
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chmod 0700 "${var_build_root}"
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if ! PATH="${var_build_path}" command -v findmnt >/dev/null 2>&1; then
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do_log "error" "file_only" "4310() Required Dropbear build command missing from sterile PATH: 'findmnt'."
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return 127
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fi
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case "${var_build_dir}" in
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/opt/.ciss/build/dropbear-*) ;;
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*)
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do_log "error" "file_only" "4310() Refusing to clean unexpected Dropbear build directory: '${var_build_dir}'."
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return "${ERR_PATH_NOT_VALID}"
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;;
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esac
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rm -rf -- "${var_build_dir}"
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tar xjf "${var_tar}" -C "${var_build_root}" || return "${ERR_PATH_NOT_VALID}"
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if [[ ! -d "${var_build_dir}" ]]; then
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do_log "error" "file_only" "4310() Dropbear build directory missing: '${var_build_dir}'."
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return "${ERR_PATH_NOT_VALID}"
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fi
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cp "${VAR_SETUP_PATH}/upgrades/dropbear/localoptions.h" "${var_build_dir}"
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if ! var_mount_target="$(PATH="${var_build_path}" findmnt -T "${var_build_dir}" -no TARGET)"; then
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do_log "error" "file_only" "4310() Cannot determine mount target for Dropbear build directory: '${var_build_dir}'."
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return "${ERR_PATH_NOT_VALID}"
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fi
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if ! var_mount_options="$(PATH="${var_build_path}" findmnt -T "${var_build_dir}" -no OPTIONS)"; then
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do_log "error" "file_only" "4310() Cannot determine mount options for Dropbear build directory: '${var_build_dir}'."
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return "${ERR_PATH_NOT_VALID}"
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fi
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if [[ ! -f "${var_build_dir}/configure" ]]; then
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do_log "error" "file_only" "4310() Dropbear configure script missing: '${var_build_dir}/configure'."
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return "${ERR_PATH_NOT_VALID}"
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fi
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if ! IFS= read -r var_configure_shebang < "${var_build_dir}/configure"; then
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do_log "error" "file_only" "4310() Cannot read Dropbear configure script: '${var_build_dir}/configure'."
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return "${ERR_PATH_NOT_VALID}"
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fi
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if [[ ! -x "${var_build_dir}/configure" ]]; then
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do_log "warn" "file_only" "4310() Dropbear configure script is not executable; correcting trusted source tree mode."
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chmod u+x "${var_build_dir}/configure" || return 126
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fi
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if [[ ! -x "${var_build_dir}/configure" ]]; then
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do_log "error" "file_only" "4310() Dropbear configure script is not executable: '${var_build_dir}/configure'."
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return 126
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fi
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(
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set -Ceuo pipefail
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PATH="${var_build_path}"
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export PATH
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cd "${var_build_dir}"
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printf '4310 Dropbear build preflight diagnostics\n'
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pwd
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id
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for var_command in bash setsid musl-gcc make nproc; do
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if var_command_path="$(command -v "${var_command}")"; then
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printf 'command -v %s: %s\n' "${var_command}" "${var_command_path}"
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else
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printf 'command -v %s: not found\n' "${var_command}"
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fi
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done
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findmnt -T .
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ls -ld .
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ls -l ./configure
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stat ./configure
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head -n 1 ./configure
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) >> "${var_build_log}" 2>&1
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if [[ ",${var_mount_options}," == *,noexec,* ]]; then
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do_log "error" "file_only" "4310() Dropbear build directory is on a noexec mount: '${var_mount_target}' options '${var_mount_options}'. Use an exec-capable build directory."
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return 126
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fi
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if [[ "${var_configure_shebang}" != "#!"* ]]; then
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do_log "error" "file_only" "4310() Dropbear configure script has no interpreter line: '${var_build_dir}/configure'."
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return 126
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fi
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read -r var_configure_interpreter _ <<< "${var_configure_shebang#\#!}"
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if [[ "${var_configure_interpreter}" != /* || ! -x "${var_configure_interpreter}" ]]; then
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do_log "error" "file_only" "4310() Dropbear configure interpreter is not executable: '${var_configure_interpreter}'."
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return 126
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fi
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for var_command in "${ary_required_commands[@]}"; do
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if ! PATH="${var_build_path}" command -v "${var_command}" >/dev/null 2>&1; then
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do_log "error" "file_only" "4310() Required Dropbear build command missing from sterile PATH: '${var_command}'."
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return 127
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fi
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done
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### Flag Purpose:
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# -fPIE : Generate position-independent executable code
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# -pie : Link the executable as PIE (so that ASLR works)
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# -static : Fully statically linked against musl
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# -s : Strip unnecessary symbols directly during linking
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# -Wl,-z,relro,-z,now: Enables full RELRO (symbol resolution at program startup)
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guard_trace on
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# shellcheck disable=SC2016,SC2312
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PATH="${var_build_path}" setsid bash -c '
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set -Ceuo pipefail
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### Sterile environment for the build-process.
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export -n SHELLOPTS
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unset PATH_SEPARATOR
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PATH_SEPARATOR=":"
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export PATH_SEPARATOR
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PATH="${1}"
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export PATH
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cd "${2}"
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CC=musl-gcc \
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CFLAGS="-Os -fPIE -Wno-undef -fstack-protector-strong -D_FORTIFY_SOURCE=2" \
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LDFLAGS="-static -pie -s -Wl,-z,relro,-z,now" \
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./configure \
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--enable-static \
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--enable-openpty \
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--disable-pam \
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--disable-zlib
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# shellcheck disable=2312
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make -j"$(nproc)"
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' bash "${var_build_path}" "${var_build_dir}" >> "${var_build_log}" 2>&1
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guard_trace off
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guard_dir; 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 dropbear_build
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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