Containerfile

@@ -6,38 +6,16 @@ FROM stagex/cpio AS cpio
 FROM stagex/linux-airgap AS linux
 FROM stagex/mtools AS mtools
 FROM stagex/xz AS xz
-FROM stagex/eudev AS eudev
-FROM stagex/keyfork AS keyfork
-FROM stagex/openpgp-card-tools AS openpgp-card-tools
-FROM stagex/gpg AS gpg
-FROM stagex/bash AS bash
 FROM stagex/grub:local AS grub
-FROM stagex/npth AS npth
-FROM stagex/libksba AS libksba
-FROM stagex/libgpg-error AS libgpg-error
-FROM stagex/libassuan AS libassuan
-FROM stagex/libgcrypt AS libgcrypt
-FROM stagex/jq AS jq
-FROM stagex/bc AS bc
-FROM stagex/git AS git
-FROM stagex/zlib AS zlib
-FROM stagex/tpm2-tools AS tpm2-tools
-FROM stagex/tpm2-tss AS tpm2-tss
-FROM stagex/openssl AS openssl
-FROM stagex/pcsc-lite AS pcsc-lite
-FROM stagex/flashtools AS flashtools
 
 FROM scratch AS base
-ARG VERSION development
-ARG GIT_TIMESTAMP null
-ARG GIT_AUTHOR null
-ARG GIT_REF null
-ARG GIT_KEY null
 COPY --from=busybox . /
 COPY --from=musl . /
 COPY --from=xorriso . /
 COPY --from=cpio . /
 COPY --from=mtools . /
+COPY --from=linux . /
+COPY --from=syslinux . /
 COPY --from=xz . /
 COPY --from=grub . /
 
@@ -47,52 +25,38 @@ FROM base AS build
 COPY --from=linux /bzImage iso/boot/vmlinuz
 
 ## Initramfs
-COPY --from=busybox . initramfs
-COPY --from=eudev . initramfs
-COPY --from=musl . initramfs
-COPY --from=zlib . initramfs
-COPY --from=npth . initramfs
-COPY --from=libksba . initramfs
-COPY --from=libgpg-error . initramfs
-COPY --from=libassuan . initramfs
-COPY --from=libgcrypt . initramfs
-COPY --from=keyfork . initramfs
-COPY --from=bash . initramfs
-COPY --from=gpg . initramfs
-COPY --from=jq . initramfs
-COPY --from=bc . initramfs
-COPY --from=git . initramfs
-COPY --from=flashtools . initramfs
-COPY --from=tpm2-tools . initramfs
-COPY --from=tpm2-tss . initramfs
-COPY --from=openssl . initramfs
-COPY --from=pcsc-lite . initramfs
-COPY --from=openpgp-card-tools . initramfs
-COPY rootfs/ initramfs
-COPY <<-EOF initramfs/etc/environment
-    export VERSION="$VERSION"
-    export GIT_TIMESTAMP="$GIT_TIMESTAMP"
-    export GIT_AUTHOR="$GIT_AUTHOR"
-    export GIT_REF="$GIT_REF"
-    export GIT_KEY="$GIT_KEY"
+COPY --from=stagex/busybox . initramfs
+COPY --chmod=0755 <<-EOF initramfs/init
+    #!/bin/sh
+    /bin/sh
 EOF
 RUN <<-EOF
+    set -eux
     cd initramfs
-	find . -print0 \
-	| cpio --null --create --verbose --format=newc \
-	| gzip --best > ../iso/boot/initramfs
+    find . \
+        | cpio -o -H newc \
+        | gzip -9 \
+    > ../iso/boot/initramfs
 EOF
 
 ## Grub (EFI Boot)
-COPY config/grub.cfg iso/boot/grub/grub.cfg
-COPY config/grub_early.cfg grub_early.cfg
+COPY <<-EOF iso/boot/grub/grub.cfg
+    menuentry "Linux Airgap" {
+	    linux	/boot/vmlinuz
+		initrd	/boot/initramfs
+    }
+EOF
+COPY <<-EOF grub_early.cfg
+	search --no-floppy --set=root --label "Airgap"
+	set prefix=(\$root)/boot/grub
+EOF
 RUN <<-EOF
     set -eux
-    mkdir -p efi/boot
+    mkdir -p iso/efi/boot
     grub-mkimage \
 		--config="grub_early.cfg" \
 		--prefix="/boot/grub" \
-        --output="efi/boot/bootx64.efi" \
+		--output="iso/efi/boot/bootx64.efi" \
 		--format="x86_64-efi" \
         --compression="xz" \
 		all_video \
@@ -107,24 +71,44 @@ RUN <<-EOF
         efi_gop \
         fat \
         iso9660 \
-        gzio \
-        serial \
-        terminal
+        cat \
+        echo \
+        ls \
+        test \
+        true \
+        help \
+        gzio
+EOF
+RUN <<-EOF
     mformat -i iso/boot/grub/efi.img -C -f 1440 -N 0 ::
-    mcopy -i iso/boot/grub/efi.img -s efi ::
+    mcopy -i iso/boot/grub/efi.img iso/efi
     touch -md "@0" iso/boot/grub/efi.img
 EOF
 
+
 ## Syslinux (BIOS Boot)
-COPY config/syslinux.cfg iso/boot/syslinux/
-COPY --from=syslinux \
-    /usr/share/syslinux/isohdpfx.bin \
-    /usr/share/syslinux/isolinux.bin \
-    /usr/share/syslinux/ldlinux.c32 \
-    /usr/share/syslinux/libutil.c32 \
-    /usr/share/syslinux/libcom32.c32 \
-    /usr/share/syslinux/mboot.c32 \
-    iso/boot/syslinux/
+COPY <<-EOF iso/boot/syslinux/syslinux.cfg
+    TIMEOUT 2
+    PROMPT -1
+    DEFAULT Airgap
+    LABEL Airgap
+        MENU LABEL Linux Airgap
+        KERNEL /boot/vmlinuz
+        INITRD /boot/initramfs
+EOF
+RUN <<-EOF
+    mkdir -p iso/boot/syslinux
+    for file in \
+        isohdpfx.bin \
+        isolinux.bin \
+        ldlinux.c32 \
+        libutil.c32 \
+        libcom32.c32 \
+        mboot.c32; \
+    do
+		mv /usr/share/syslinux/$file iso/boot/syslinux/$file || return 1
+	done
+EOF
 
 ## Build Hybrid EFI/BIOS ISO
 FROM build AS install
@@ -134,7 +118,6 @@ RUN xorrisofs \
     -joliet \
     -rational-rock \
     -sysid LINUX \
-    -volid "airgap" \
     -isohybrid-mbr iso/boot/syslinux/isohdpfx.bin \
     -eltorito-boot boot/syslinux/isolinux.bin \
     -eltorito-catalog boot/syslinux/boot.cat \
@@ -149,5 +132,5 @@ RUN xorrisofs \
    iso/
 
 FROM scratch AS package
-COPY --from=install /initramfs /initramfs
+COPY --from=install /iso /iso
 COPY --from=install /airgap.iso /

Makefile

@@ -1,42 +1,27 @@
-VERSION := $(shell git tag --points-at HEAD)
-GIT_REF := $(shell git log -1 --format=%H)
-GIT_AUTHOR := $(shell git log -1 --format=%an)
-GIT_KEY := $(shell git log -1 --format=%GP)
-GIT_TIMESTAMP := $(shell git log -1 --format=%cd --date=iso)
-
 .DEFAULT_GOAL :=
 .PHONY: default
 default: \
 	out/airgap.iso
 
 .PHONY: vm
-vm: vm-bios
-
-.PHONY: vm-bios
-vm-bios: out/airgap.iso
+vm: out/airgap.iso
 	qemu-system-x86_64 \
-		-m 4G \
+		-m 512M \
 		-machine pc \
-		-serial stdio \
+		-nographic \
 		-cdrom "out/airgap.iso"
 
-.PHONY: vm-efi
-vm-efi: out/airgap.iso
+.PHONY: vm-uefi
+vm-uefi:
 	qemu-system-x86_64 \
 		-m 4G \
-		-machine pc \
-		-serial stdio \
+		-machine type=q35 \
 		-bios /usr/share/ovmf/OVMF.fd \
 		-cdrom "out/airgap.iso"
 
-out/airgap.iso: Containerfile $(shell git ls-files rootfs)
+out/airgap.iso: Containerfile
 	docker build \
 		--progress=plain \
 		--output type=local,dest=out \
-		--build-arg VERSION="$(or $(VERSION),"development")" \
-		--build-arg GIT_REF="$(GIT_REF)" \
-		--build-arg GIT_AUTHOR="$(GIT_AUTHOR)" \
-		--build-arg GIT_KEY="$(GIT_KEY)" \
-		--build-arg GIT_TIMESTAMP="$(GIT_TIMESTAMP)" \
 		-f Containerfile \
 		.

config/grub.cfg

@@ -1,5 +0,0 @@
-set timeout=1
-menuentry "Linux Airgap" {
-    linux /boot/vmlinuz init=/init console=ttyS0 console=tty0 ro
-    initrd /boot/initramfs
-}

config/grub_early.cfg

@@ -1,2 +0,0 @@
-search --no-floppy --set=root --label "airgap"
-set prefix=($root)/boot/grub

config/syslinux.cfg

@@ -1,8 +0,0 @@
-TIMEOUT 2
-PROMPT -1
-DEFAULT Airgap
-LABEL Airgap
-	MENU LABEL Linux Airgap
-	KERNEL /boot/vmlinuz
-	INITRD /boot/initramfs
-	APPEND init=/init console=ttyS0 console=tty0 ro

rootfs/etc/init.d/S01syslogd

@@ -1,55 +0,0 @@
-#!/bin/sh
-
-DAEMON="syslogd"
-PIDFILE="/var/run/$DAEMON.pid"
-
-SYSLOGD_ARGS=""
-
-# shellcheck source=/dev/null
-[ -r "/etc/default/$DAEMON" ] && . "/etc/default/$DAEMON"
-
-# BusyBox' syslogd does not create a pidfile, so pass "-n" in the command line
-# and use "-m" to instruct start-stop-daemon to create one.
-start() {
-	printf 'Starting %s: ' "$DAEMON"
-	# shellcheck disable=SC2086 # we need the word splitting
-	start-stop-daemon -b -m -S -q -p "$PIDFILE" -x "/sbin/$DAEMON" \
-		-- -n $SYSLOGD_ARGS
-	status=$?
-	if [ "$status" -eq 0 ]; then
-		echo "OK"
-	else
-		echo "FAIL"
-	fi
-	return "$status"
-}
-
-stop() {
-	printf 'Stopping %s: ' "$DAEMON"
-	start-stop-daemon -K -q -p "$PIDFILE"
-	status=$?
-	if [ "$status" -eq 0 ]; then
-		rm -f "$PIDFILE"
-		echo "OK"
-	else
-		echo "FAIL"
-	fi
-	return "$status"
-}
-
-restart() {
-	stop
-	sleep 1
-	start
-}
-
-case "$1" in
-	start|stop|restart)
-		"$1";;
-	reload)
-		# Restart, since there is no true "reload" feature.
-		restart;;
-	*)
-		echo "Usage: $0 {start|stop|restart|reload}"
-		exit 1
-esac

rootfs/etc/init.d/S02klogd

@@ -1,55 +0,0 @@
-#!/bin/sh
-
-DAEMON="klogd"
-PIDFILE="/var/run/$DAEMON.pid"
-
-KLOGD_ARGS=""
-
-# shellcheck source=/dev/null
-[ -r "/etc/default/$DAEMON" ] && . "/etc/default/$DAEMON"
-
-# BusyBox' klogd does not create a pidfile, so pass "-n" in the command line
-# and use "-m" to instruct start-stop-daemon to create one.
-start() {
-	printf 'Starting %s: ' "$DAEMON"
-	# shellcheck disable=SC2086 # we need the word splitting
-	start-stop-daemon -b -m -S -q -p "$PIDFILE" -x "/sbin/$DAEMON" \
-		-- -n $KLOGD_ARGS
-	status=$?
-	if [ "$status" -eq 0 ]; then
-		echo "OK"
-	else
-		echo "FAIL"
-	fi
-	return "$status"
-}
-
-stop() {
-	printf 'Stopping %s: ' "$DAEMON"
-	start-stop-daemon -K -q -p "$PIDFILE"
-	status=$?
-	if [ "$status" -eq 0 ]; then
-		rm -f "$PIDFILE"
-		echo "OK"
-	else
-		echo "FAIL"
-	fi
-	return "$status"
-}
-
-restart() {
-	stop
-	sleep 1
-	start
-}
-
-case "$1" in
-	start|stop|restart)
-		"$1";;
-	reload)
-		# Restart, since there is no true "reload" feature.
-		restart;;
-	*)
-		echo "Usage: $0 {start|stop|restart|reload}"
-		exit 1
-esac

rootfs/etc/init.d/S02sysctl

@@ -1,94 +0,0 @@
-#!/bin/sh
-#
-# This script is used by busybox and procps-ng.
-#
-# With procps-ng, the "--system" option of sysctl also enables "--ignore", so
-# errors are not reported via syslog. Use the run_logger function to mimic the
-# --system behavior, still reporting errors via syslog. Users not interested
-# on error reports can add "-e" to SYSCTL_ARGS.
-#
-# busybox does not have a "--system" option neither reports errors via syslog,
-# so the scripting provides a consistent behavior between the implementations.
-# Testing the busybox sysctl exit code is fruitless, as at the moment, since
-# its exit status is zero even if errors happen. Hopefully this will be fixed
-# in a future busybox version.
-
-PROGRAM="sysctl"
-
-SYSCTL_ARGS=""
-
-# shellcheck source=/dev/null
-[ -r "/etc/default/$PROGRAM" ] && . "/etc/default/$PROGRAM"
-
-# Files are read from directories in the SYSCTL_SOURCES list, in the given
-# order. A file may be used more than once, since there can be multiple
-# symlinks to it. No attempt is made to prevent this.
-SYSCTL_SOURCES="/etc/sysctl.d/ /usr/local/lib/sysctl.d/ /usr/lib/sysctl.d/ /lib/sysctl.d/ /etc/sysctl.conf"
-
-# If the logger utility is available all messages are sent to syslog, except
-# for the final status. The file redirections do the following:
-#
-# - stdout is redirected to syslog with facility.level "kern.info"
-# - stderr is redirected to syslog with facility.level "kern.err"
-# - file dscriptor 4 is used to pass the result to the "start" function.
-#
-run_logger() {
-	# shellcheck disable=SC2086 # we need the word splitting
-	find $SYSCTL_SOURCES -maxdepth 1 -name '*.conf' -print0 2> /dev/null | \
-	xargs -0 -r -n 1 readlink -f | {
-		prog_status="OK"
-		while :; do
-			read -r file || {
-				echo "$prog_status" >&4
-				break
-			}
-			echo "* Applying $file ..."
-			/sbin/sysctl -p "$file" $SYSCTL_ARGS || prog_status="FAIL"
-		done 2>&1 >&3 | /usr/bin/logger -t sysctl -p kern.err
-	} 3>&1 | /usr/bin/logger -t sysctl -p kern.info
-}
-
-# If logger is not available all messages are sent to stdout/stderr.
-run_std() {
-	# shellcheck disable=SC2086 # we need the word splitting
-	find $SYSCTL_SOURCES -maxdepth 1 -name '*.conf' -print0 2> /dev/null | \
-	xargs -0 -r -n 1 readlink -f | {
-		prog_status="OK"
-		while :; do
-			read -r file || {
-				echo "$prog_status" >&4
-				break
-			}
-			echo "* Applying $file ..."
-			/sbin/sysctl -p "$file" $SYSCTL_ARGS || prog_status="FAIL"
-		done
-	}
-}
-
-if [ -x /usr/bin/logger ]; then
-	run_program="run_logger"
-else
-	run_program="run_std"
-fi
-
-start() {
-	printf '%s %s: ' "$1" "$PROGRAM"
-	status=$("$run_program" 4>&1)
-	echo "$status"
-	if [ "$status" = "OK" ]; then
-		return 0
-	fi
-	return 1
-}
-
-case "$1" in
-	start)
-		start "Running";;
-	restart|reload)
-		start "Rerunning";;
-	stop)
-		:;;
-	*)
-		echo "Usage: $0 {start|stop|restart|reload}"
-		exit 1
-esac

rootfs/etc/init.d/S10udev

@@ -1,29 +0,0 @@
-#!/bin/sh
-
-# Check for config file and read it
-UDEV_CONFIG=/etc/udev/udev.conf
-test -r $UDEV_CONFIG || exit 6
-. $UDEV_CONFIG
-
-case "$1" in
-    start)
-        printf "Populating %s using udev: " "${udev_root:-/dev}"
-        [ -e /proc/sys/kernel/hotplug ] && printf '\000\000\000\000' > /proc/sys/kernel/hotplug
-        /sbin/udevd -d || { echo "FAIL"; exit 1; }
-        udevadm trigger --type=subsystems --action=add
-        udevadm trigger --type=devices --action=add
-        udevadm settle --timeout=30 || echo "udevadm settle failed"
-        echo "done"
-        ;;
-    stop)
-        # Stop execution of events
-        udevadm control --stop-exec-queue
-        killall udevd
-        ;;
-    *)
-        echo "Usage: $0 {start|stop}"
-        exit 1
-        ;;
-esac
-
-exit 0

rootfs/etc/init.d/S20urandom

@@ -1,70 +0,0 @@
-#! /bin/sh
-#
-# Preserve the random seed between reboots. See urandom(4).
-#
-
-# Quietly do nothing if /dev/urandom does not exist
-[ -c /dev/urandom ] || exit 0
-
-URANDOM_SEED="/var/lib/random-seed"
-
-# shellcheck source=/dev/null
-[ -r "/etc/default/urandom" ] && . "/etc/default/urandom"
-
-if pool_bits=$(cat /proc/sys/kernel/random/poolsize 2> /dev/null); then
-	pool_size=$((pool_bits/8))
-else
-	pool_size=512
-fi
-
-init_rng() {
-	[ -f "$URANDOM_SEED" ] || return 0
-	printf 'Initializing random number generator: '
-	dd if="$URANDOM_SEED" bs="$pool_size" of=/dev/urandom count=1 2> /dev/null
-	status=$?
-	if [ "$status" -eq 0 ]; then
-		echo "OK"
-	else
-		echo "FAIL"
-	fi
-	return "$status"
-}
-
-save_random_seed() {
-	printf 'Saving random seed: '
-	status=1
-	if touch "$URANDOM_SEED.new" 2> /dev/null; then
-		old_umask=$(umask)
-		umask 077
-		dd if=/dev/urandom of="$URANDOM_SEED.tmp" bs="$pool_size" count=1 2> /dev/null
-		cat "$URANDOM_SEED" "$URANDOM_SEED.tmp" 2>/dev/null \
-			| sha256sum \
-			| cut -d ' ' -f 1 > "$URANDOM_SEED.new" && \
-		mv "$URANDOM_SEED.new" "$URANDOM_SEED" && status=0
-		rm -f "$URANDOM_SEED.tmp"
-		umask "$old_umask"
-		if [ "$status" -eq 0 ]; then
-			echo "OK"
-		else
-			echo "FAIL"
-		fi
-
-	else
-		echo "SKIP (read-only file system detected)"
-	fi
-	return "$status"
-}
-
-case "$1" in
-	start|restart|reload)
-		# Carry a random seed from start-up to start-up
-		# Load and then save the whole entropy pool
-		init_rng && save_random_seed;;
-	stop)
-		# Carry a random seed from shut-down to start-up
-		# Save the whole entropy pool
-		save_random_seed;;
-	*)
-		echo "Usage: $0 {start|stop|restart|reload}"
-		exit 1
-esac

rootfs/etc/init.d/rcK

@@ -1,27 +0,0 @@
-#!/bin/sh
-
-
-# Stop all init scripts in /etc/init.d
-# executing them in reversed numerical order.
-#
-for i in $(ls -r /etc/init.d/S??*) ;do
-
-     # Ignore dangling symlinks (if any).
-     [ ! -f "$i" ] && continue
-
-     case "$i" in
-	*.sh)
-	    # Source shell script for speed.
-	    (
-		trap - INT QUIT TSTP
-		set stop
-		. $i
-	    )
-	    ;;
-	*)
-	    # No sh extension, so fork subprocess.
-	    $i stop
-	    ;;
-    esac
-done
-

rootfs/etc/init.d/rcS

@@ -1,27 +0,0 @@
-#!/bin/sh
-
-
-# Start all init scripts in /etc/init.d
-# executing them in numerical order.
-#
-for i in /etc/init.d/S??* ;do
-
-     # Ignore dangling symlinks (if any).
-     [ ! -f "$i" ] && continue
-
-     case "$i" in
-	*.sh)
-	    # Source shell script for speed.
-	    (
-		trap - INT QUIT TSTP
-		set start
-		. $i
-	    )
-	    ;;
-	*)
-	    # No sh extension, so fork subprocess.
-	    $i start
-	    ;;
-    esac
-done
-

rootfs/etc/inittab

@@ -1,5 +1,11 @@
 # /etc/inittab
-
+#
+# Copyright (C) 2001 Erik Andersen <andersen@codepoet.org>
+#
+# Note: BusyBox init doesn't support runlevels.  The runlevels field is
+# completely ignored by BusyBox init. If you want runlevels, use
+# sysvinit.
+#
 # Format for each entry: <id>:<runlevels>:<action>:<process>
 #
 # id        == tty to run on, or empty for /dev/console
@@ -8,15 +14,16 @@
 # process   == program to run
 
 # Startup the system
-::sysinit:/bin/mount -t devtmpfs devtmpfs /dev
-::sysinit:/bin/mkdir -p /proc /run /dev/pts /dev/shm
 ::sysinit:/bin/mount -t proc proc /proc
 ::sysinit:/bin/mount -o remount,rw /
+::sysinit:/bin/mkdir -p /dev/pts /dev/shm
 ::sysinit:/bin/mount -a
+::sysinit:/sbin/swapon -a
 null::sysinit:/bin/ln -sf /proc/self/fd /dev/fd
 null::sysinit:/bin/ln -sf /proc/self/fd/0 /dev/stdin
 null::sysinit:/bin/ln -sf /proc/self/fd/1 /dev/stdout
 null::sysinit:/bin/ln -sf /proc/self/fd/2 /dev/stderr
+::sysinit:/bin/hostname -F /etc/hostname
 # now run any rc scripts
 ::sysinit:/etc/init.d/rcS
 
@@ -29,4 +36,5 @@ null::sysinit:/bin/ln -sf /proc/self/fd/2 /dev/stderr
 
 # Stuff to do before rebooting
 ::shutdown:/etc/init.d/rcK
+::shutdown:/sbin/swapoff -a
 ::shutdown:/bin/umount -a -r

rootfs/etc/profile

@@ -3,7 +3,8 @@ export PATH="/usr/local/bin:/bin:/sbin:/usr/bin:/usr/sbin"
 export PS1="[\h \t] \\$ "
 export GNUPGHOME=/.gnupg
 source /etc/environment
-cd /root
+
+dmesg -n1
 clear
 cat << "EOF"
       _    _                        ___  ____

rootfs/init

@@ -1,2 +0,0 @@
-#!/bin/sh
-exec /bin/init