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Raspi2-3_GenImage
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first public release
Jan Wagner -
r2:d773fd3c878c
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1 #!/bin/sh
2
3 ########################################################################
4 # rpi2-gen-image.sh ver2a 12/2015
5 #
6 # Advanced debian "jessie" bootstrap script for RPi2
7 #
8 # This program is free software; you can redistribute it and/or
9 # modify it under the terms of the GNU General Public License
10 # as published by the Free Software Foundation; either version 2
11 # of the License, or (at your option) any later version.
12 #
13 # some parts based on rpi2-build-image:
14 # Copyright (C) 2015 Ryan Finnie <ryan@finnie.org>
15 # Copyright (C) 2015 Luca Falavigna <dktrkranz@debian.org>
16 ########################################################################
17
18 cleanup (){
19 set +x
20 set +e
21 echo "removing temporary mount points ..."
22 umount -l $R/proc 2> /dev/null
23 umount -l $R/sys 2> /dev/null
24 umount -l $R/dev/pts 2> /dev/null
25 umount "$BUILDDIR/mount/boot/firmware" 2> /dev/null
26 umount "$BUILDDIR/mount" 2> /dev/null
27 losetup -d "$EXT4_LOOP" 2> /dev/null
28 losetup -d "$VFAT_LOOP" 2> /dev/null
29 trap - 0 1 2 3 6
30 }
31
32 set -e
33 set -x
34
35 RELEASE=${RELEASE:=jessie}
36
37 # Build settings
38 BASEDIR=./images/${RELEASE}
39 BUILDDIR=${BASEDIR}/build
40
41 # General settings
42 HOSTNAME=${HOSTNAME:=rpi2-${RELEASE}}
43 PASSWORD=${PASSWORD:=raspberry}
44 DEFLOCAL=${DEFLOCAL:="en_US.UTF-8"}
45 TIMEZONE=${TIMEZONE:="Europe/Berlin"}
46
47 # APT settings
48 APT_PROXY=${APT_PROXY:=""}
49 APT_SERVER=${APT_SERVER:="ftp.debian.org"}
50
51 # Feature settings
52 ENABLE_CONSOLE=${ENABLE_CONSOLE:=true}
53 ENABLE_IPV6=${ENABLE_IPV6:=true}
54 ENABLE_SSHD=${ENABLE_SSHD:=true}
55 ENABLE_SOUND=${ENABLE_SOUND:=true}
56 ENABLE_SYSTEMD=${ENABLE_SYSTEMD:=true}
57 ENABLE_DBUS=${ENABLE_DBUS:=true}
58 ENABLE_HWRANDOM=${ENABLE_HWRANDOM:=true}
59 ENABLE_MINGPU=${ENABLE_MINGPU:=false}
60 ENABLE_XORG=${ENABLE_XORG:=false}
61 ENABLE_FLUXBOX=${ENABLE_FLUXBOX:=false}
62
63 # Advanced settings
64 ENABLE_HARDNET=${ENABLE_HARDNET:=false}
65 ENABLE_IPTABLES=${ENABLE_IPTABLES:=false}
66
67 # Image chroot path
68 R=${BUILDDIR}/chroot
69
70 # Packages required for bootstrapping
71 REQUIRED_PACKAGES="debootstrap debian-archive-keyring qemu-user-static dosfstools rsync bmap-tools whois"
72
73 # Packages required in the chroot build enviroment
74 APT_INCLUDES="apt-transport-https,ca-certificates,debian-archive-keyring,dialog,locales,apt-utils,vim-tiny"
75
76 set +x
77
78 # Are we running as root?
79 if [ "$(id -u)" -ne "0" ] ; then
80 echo "this script must be executed with root privileges"
81 exit 1
82 fi
83
84 # Don't clobber an old build
85 if [ -e "$BUILDDIR" ]; then
86 echo "directory $BUILDDIR already exists, not proceeding"
87 exit 1
88 fi
89
90 set -x
91
92 # Call "cleanup" function on various signals and errors
93 trap cleanup 0 1 2 3 6
94
95 # Set up chroot directory
96 mkdir -p $R
97
98 # Install dependencies
99 apt-get -q -y install ${REQUIRED_PACKAGES}
100
101 # Use traditional SystemV init instead of systemd services
102 if [ "$ENABLE_SYSTEMD" = false ] ; then
103 APT_INCLUDES="${APT_INCLUDES},sysvinit-core"
104 fi
105
106 # Add dbus package, recommended if using systemd
107 if [ "$ENABLE_DBUS" = true ] ; then
108 APT_INCLUDES="${APT_INCLUDES},dbus"
109 fi
110
111 # Add openssh server package
112 if [ "$ENABLE_SSHD" = true ] ; then
113 APT_INCLUDES="${APT_INCLUDES},openssh-server"
114 fi
115
116 # Add rng-tools package
117 if [ "$ENABLE_HWRANDOM" = true ] ; then
118 APT_INCLUDES="${APT_INCLUDES},rng-tools"
119 fi
120
121 # Add xorg package
122 if [ "$ENABLE_XORG" = true ] ; then
123 APT_INCLUDES="${APT_INCLUDES},xorg"
124 fi
125
126 # Add fluxbox package with eterm
127 if [ "$ENABLE_FLUXBOX" = true ] ; then
128 APT_INCLUDES="${APT_INCLUDES},fluxbox,eterm"
129 fi
130
131 if [ -z "$APT_PROXY" ] ; then
132 APT_PROXY="http://"
133 fi
134
135 # Base debootstrap (unpack only)
136 debootstrap --arch=armhf --foreign --include=${APT_INCLUDES} $RELEASE $R ${APT_PROXY}${APT_SERVER}/debian
137 cp /usr/bin/qemu-arm-static $R/usr/bin
138
139 # Remove systemd releated packages from list of packages to be bootsrapped
140 if [ "$ENABLE_SYSTEMD" = false ] ; then
141 chroot $R sed -i -e 's/systemd systemd-sysv //g' /debootstrap/required
142 fi
143
144 # Copy debian-archive-keyring.pgp
145 chroot $R mkdir -p /usr/share/keyrings
146 cp /usr/share/keyrings/debian-archive-keyring.gpg $R/usr/share/keyrings/debian-archive-keyring.gpg
147
148 # Complete the bootstrapping proccess
149 chroot $R /debootstrap/debootstrap --second-stage
150
151 # Mount required filesystems
152 mount -t proc none $R/proc
153 mount -t sysfs none $R/sys
154 mount --bind /dev/pts $R/dev/pts
155
156 # Set up initial sources.list
157 cat <<EOM >$R/etc/apt/sources.list
158 deb http://${APT_SERVER}/debian ${RELEASE} main contrib
159 #deb-src http://${APT_SERVER}/debian ${RELEASE} main contrib
160
161 deb http://${APT_SERVER}/debian/ ${RELEASE}-updates main contrib
162 #deb-src http://${APT_SERVER}/debian/ ${RELEASE}-updates main contrib
163
164 deb http://security.debian.org/ ${RELEASE}/updates main contrib
165 #deb-src http://security.debian.org/ ${RELEASE}/updates main contrib
166
167 deb https://repositories.collabora.co.uk/debian ${RELEASE} rpi2
168 EOM
169
170 # Pin package flash-kernel to repositories.collabora.co.uk
171 cat <<EOM >$R/etc/apt/preferences.d/flash-kernel
172 Package: flash-kernel
173 Pin: origin repositories.collabora.co.uk
174 Pin-Priority: 1000
175 EOM
176
177 # Set up timezone
178 echo ${TIMEZONE} >$R/etc/timezone
179 LANG=C chroot $R dpkg-reconfigure -f noninteractive tzdata
180
181 # Set up default locales to "en_US.UTF-8" default
182 LANG=C chroot $R sed -i '/${DEFLOCAL}/s/^#//' /etc/locale.gen
183 LANG=C chroot $R locale-gen ${DEFLOCAL}
184
185 # Fetch APT public key "Collabora Raspbian Archive Signing Key <daniels@collabora.com>"
186 LANG=C chroot $R apt-key adv --keyserver hkp://pool.sks-keyservers.net --recv-keys ED4BF9140C50B1C5
187
188 # Upgrade package index and update all installed packages and changed dependencies
189 LANG=C chroot $R apt-get -q -y update
190 LANG=C chroot $R apt-get -q -y -u dist-upgrade
191
192 # Kernel installation
193 # Install flash-kernel last so it doesn't try (and fail) to detect the platform in the chroot
194
195 LANG=C chroot $R apt-get -q -y --force-yes --no-install-recommends install linux-image-3.18.0-trunk-rpi2
196 LANG=C chroot $R apt-get -q -y --force-yes install flash-kernel
197
198 VMLINUZ="$(ls -1 $R/boot/vmlinuz-* | sort | tail -n 1)"
199 [ -z "$VMLINUZ" ] && exit 1
200 mkdir -p $R/boot/firmware
201
202 # required boot binaries from raspberry/firmware github (commit: "kernel: Bump to 3.18.10")
203 wget -q -O $R/boot/firmware/bootcode.bin https://github.com/raspberrypi/firmware/raw/cd355a9dd4f1f4de2e79b0c8e102840885cdf1de/boot/bootcode.bin
204 wget -q -O $R/boot/firmware/fixup_cd.dat https://github.com/raspberrypi/firmware/raw/cd355a9dd4f1f4de2e79b0c8e102840885cdf1de/boot/fixup_cd.dat
205 wget -q -O $R/boot/firmware/fixup.dat https://github.com/raspberrypi/firmware/raw/cd355a9dd4f1f4de2e79b0c8e102840885cdf1de/boot/fixup.dat
206 wget -q -O $R/boot/firmware/fixup_x.dat https://github.com/raspberrypi/firmware/raw/cd355a9dd4f1f4de2e79b0c8e102840885cdf1de/boot/fixup_x.dat
207 wget -q -O $R/boot/firmware/start_cd.elf https://github.com/raspberrypi/firmware/raw/cd355a9dd4f1f4de2e79b0c8e102840885cdf1de/boot/start_cd.elf
208 wget -q -O $R/boot/firmware/start.elf https://github.com/raspberrypi/firmware/raw/cd355a9dd4f1f4de2e79b0c8e102840885cdf1de/boot/start.elf
209 wget -q -O $R/boot/firmware/start_x.elf https://github.com/raspberrypi/firmware/raw/cd355a9dd4f1f4de2e79b0c8e102840885cdf1de/boot/start_x.elf
210 cp $VMLINUZ $R/boot/firmware/kernel7.img
211
212 # Set up hosts
213 echo ${HOSTNAME} >$R/etc/hostname
214 cat <<EOM >$R/etc/hosts
215 127.0.0.1 localhost
216 127.0.1.1 ${HOSTNAME}
217 EOM
218
219 if [ "$ENABLE_IPV6" = true ] ; then
220 cat <<EOM >>$R/etc/hosts
221
222 ::1 localhost ip6-localhost ip6-loopback
223 ff02::1 ip6-allnodes
224 ff02::2 ip6-allrouters
225 EOM
226 fi
227
228 # Generate crypt(3) password string
229 ENCRYPTED_PASSWORD=`mkpasswd -m sha-512 ${PASSWORD}`
230
231 # Set up default user
232 LANG=C chroot $R adduser --gecos "Raspberry PI user" --add_extra_groups --disabled-password pi
233 LANG=C chroot $R usermod -a -G sudo -p "${ENCRYPTED_PASSWORD}" pi
234
235 # Set up root password
236 LANG=C chroot $R usermod -p "${ENCRYPTED_PASSWORD}" root
237
238 # Clean cached downloads
239 LANG=C chroot $R apt-get -y clean
240 LANG=C chroot $R apt-get -y autoclean
241 LANG=C chroot $R apt-get -y autoremove
242
243 # Set up interfaces
244 cat <<EOM >$R/etc/network/interfaces
245 # interfaces(5) file used by ifup(8) and ifdown(8)
246 # Include files from /etc/network/interfaces.d:
247 source-directory /etc/network/interfaces.d
248
249 # The loopback network interface
250 auto lo
251 iface lo inet loopback
252
253 # The primary network interface
254 allow-hotplug eth0
255 iface eth0 inet dhcp
256 EOM
257
258 # Set up firmware boot cmdline
259 CMDLINE="dwc_otg.lpm_enable=0 root=/dev/mmcblk0p2 rootfstype=ext4 rootflags=commit=100,data=writeback elevator=deadline rootwait net.ifnames=1 console=tty1"
260
261 # Set up serial console support (if requested)
262 if [ "$ENABLE_CONSOLE" = true ] ; then
263 CMDLINE="${CMDLINE} console=ttyAMA0,115200 kgdboc=ttyAMA0,115200"
264 fi
265
266 # Set up ipv6 support (if requested)
267 if [ "$ENABLE_IPV6" = false ] ; then
268 CMDLINE="${CMDLINE} ipv6.disable=1"
269 fi
270
271 echo "${CMDLINE}" >$R/boot/firmware/cmdline.txt
272
273 # Set up firmware config
274 cat <<EOM >$R/boot/firmware/config.txt
275 # For more options and information see
276 # http://www.raspberrypi.org/documentation/configuration/config-txt.md
277 # Some settings may impact device functionality. See link above for details
278
279 # uncomment if you get no picture on HDMI for a default "safe" mode
280 #hdmi_safe=1
281
282 # uncomment this if your display has a black border of unused pixels visible
283 # and your display can output without overscan
284 #disable_overscan=1
285
286 # uncomment the following to adjust overscan. Use positive numbers if console
287 # goes off screen, and negative if there is too much border
288 #overscan_left=16
289 #overscan_right=16
290 #overscan_top=16
291 #overscan_bottom=16
292
293 # uncomment to force a console size. By default it will be display's size minus
294 # overscan.
295 #framebuffer_width=1280
296 #framebuffer_height=720
297
298 # uncomment if hdmi display is not detected and composite is being output
299 #hdmi_force_hotplug=1
300
301 # uncomment to force a specific HDMI mode (this will force VGA)
302 #hdmi_group=1
303 #hdmi_mode=1
304
305 # uncomment to force a HDMI mode rather than DVI. This can make audio work in
306 # DMT (computer monitor) modes
307 #hdmi_drive=2
308
309 # uncomment to increase signal to HDMI, if you have interference, blanking, or
310 # no display
311 #config_hdmi_boost=4
312
313 # uncomment for composite PAL
314 #sdtv_mode=2
315
316 #uncomment to overclock the arm. 700 MHz is the default.
317 #arm_freq=800
318 EOM
319
320 # Set smallest possible GPU memory allocation size: 16MB (no X)
321 if [ "$ENABLE_MINGPU" = true ] ; then
322 echo "gpu_mem=16" >>$R/boot/firmware/config.txt
323 fi
324
325 # Create symlinks
326 ln -sf firmware/config.txt $R/boot/config.txt
327 ln -sf firmware/cmdline.txt $R/boot/cmdline.txt
328
329 # Prepare modules-load.d directory
330 mkdir -p $R/lib/modules-load.d/
331
332 # Load random module on boot
333 if [ "$ENABLE_HWRANDOM" = true ] ; then
334 cat <<EOM >$R/lib/modules-load.d/rpi2.conf
335 bcm2708_rng
336 EOM
337 fi
338
339 # Prepare modprobe.d directory
340 mkdir -p $R/etc/modprobe.d/
341
342 # Blacklist sound modules
343 cat <<EOM >$R/etc/modprobe.d/raspi-blacklist.conf
344 blacklist snd_soc_core
345 blacklist snd_pcm
346 blacklist snd_pcm_dmaengine
347 blacklist snd_timer
348 blacklist snd_compress
349 blacklist snd_soc_pcm512x_i2c
350 blacklist snd_soc_pcm512x
351 blacklist snd_soc_tas5713
352 blacklist snd_soc_wm8804
353 EOM
354
355 # Create default fstab
356 cat <<EOM >$R/etc/fstab
357 /dev/mmcblk0p2 / ext4 noatime,nodiratime,errors=remount-ro,discard,data=writeback,commit=100 0 1
358 /dev/mmcblk0p1 /boot/firmware vfat defaults,noatime,nodiratime 0 2
359 EOM
360
361 # Avoid swapping and increase cache sizes
362 cat <<EOM >>$R/etc/sysctl.d/99-sysctl.conf
363
364 # Avoid swapping and increase cache sizes
365 vm.swappiness=1
366 vm.dirty_background_ratio=20
367 vm.dirty_ratio=40
368 vm.dirty_writeback_centisecs=500
369 vm.dirty_expire_centisecs=6000
370 EOM
371
372 # Enable network stack hardening
373 if [ "$ENABLE_HARDNET" = true ] ; then
374 cat <<EOM >>$R/etc/sysctl.d/99-sysctl.conf
375
376 # Enable network stack hardening
377 net.ipv4.tcp_timestamps=0
378 net.ipv4.tcp_syncookies=1
379 net.ipv4.conf.all.rp_filter=1
380 net.ipv4.conf.all.accept_redirects=0
381 net.ipv4.conf.all.send_redirects=0
382 net.ipv4.conf.all.accept_source_route=0
383 net.ipv4.conf.default.rp_filter=1
384 net.ipv4.conf.default.accept_redirects=0
385 net.ipv4.conf.default.send_redirects=0
386 net.ipv4.conf.default.accept_source_route=0
387 net.ipv4.conf.lo.accept_redirects=0
388 net.ipv4.conf.lo.send_redirects=0
389 net.ipv4.conf.lo.accept_source_route=0
390 net.ipv4.conf.eth0.accept_redirects=0
391 net.ipv4.conf.eth0.send_redirects=0
392 net.ipv4.conf.eth0.accept_source_route=0
393 net.ipv4.icmp_echo_ignore_broadcasts=1
394 net.ipv4.icmp_ignore_bogus_error_responses=1
395
396 net.ipv6.conf.all.accept_redirects=0
397 net.ipv6.conf.all.accept_source_route=0
398 net.ipv6.conf.all.router_solicitations=0
399 net.ipv6.conf.all.accept_ra_rtr_pref=0
400 net.ipv6.conf.all.accept_ra_pinfo=0
401 net.ipv6.conf.all.accept_ra_defrtr=0
402 net.ipv6.conf.all.autoconf=0
403 net.ipv6.conf.all.dad_transmits=0
404 net.ipv6.conf.all.max_addresses=1
405
406 net.ipv6.conf.default.accept_redirects=0
407 net.ipv6.conf.default.accept_source_route=0
408 net.ipv6.conf.default.router_solicitations=0
409 net.ipv6.conf.default.accept_ra_rtr_pref=0
410 net.ipv6.conf.default.accept_ra_pinfo=0
411 net.ipv6.conf.default.accept_ra_defrtr=0
412 net.ipv6.conf.default.autoconf=0
413 net.ipv6.conf.default.dad_transmits=0
414 net.ipv6.conf.default.max_addresses=1
415
416 net.ipv6.conf.lo.accept_redirects=0
417 net.ipv6.conf.lo.accept_source_route=0
418 net.ipv6.conf.lo.router_solicitations=0
419 net.ipv6.conf.lo.accept_ra_rtr_pref=0
420 net.ipv6.conf.lo.accept_ra_pinfo=0
421 net.ipv6.conf.lo.accept_ra_defrtr=0
422 net.ipv6.conf.lo.autoconf=0
423 net.ipv6.conf.lo.dad_transmits=0
424 net.ipv6.conf.lo.max_addresses=1
425
426 net.ipv6.conf.eth0.accept_redirects=0
427 net.ipv6.conf.eth0.accept_source_route=0
428 net.ipv6.conf.eth0.router_solicitations=0
429 net.ipv6.conf.eth0.accept_ra_rtr_pref=0
430 net.ipv6.conf.eth0.accept_ra_pinfo=0
431 net.ipv6.conf.eth0.accept_ra_defrtr=0
432 net.ipv6.conf.eth0.autoconf=0
433 net.ipv6.conf.eth0.dad_transmits=0
434 net.ipv6.conf.eth0.max_addresses=1
435 EOM
436
437 # Enable resolver warnings about spoofed addresses
438 cat <<EOM >>$R/etc/host.conf
439 spoof warn
440 EOM
441 fi
442
443 # Regenerate openssh server host keys
444 if [ "$ENABLE_SSHD" = true ] ; then
445 rm -fr $R/etc/ssh/ssh_host_*
446 LANG=C chroot $R dpkg-reconfigure openssh-server
447 fi
448
449 # Enable serial console systemd style
450 if [ "$ENABLE_CONSOLE" = true ] ; then
451 LANG=C chroot $R systemctl enable serial-getty\@ttyAMA0.service
452 fi
453
454 # Enable firewall based on iptables started by systemd service
455 if [ "$ENABLE_IPTABLES" = true ] ; then
456 # Create iptables configuration directory
457 mkdir -p "$R/etc/iptables"
458
459 # Create iptables systemd service
460 cat <<EOM >$R/etc/systemd/system/iptables.service
461 [Unit]
462 Description=Packet Filtering Framework
463 DefaultDependencies=no
464 After=systemd-sysctl.service
465 Before=sysinit.target
466 [Service]
467 Type=oneshot
468 ExecStart=/sbin/iptables-restore /etc/iptables/iptables.rules
469 ExecReload=/sbin/iptables-restore /etc/iptables/iptables.rules
470 ExecStop=/etc/iptables/flush-iptables.sh
471 RemainAfterExit=yes
472 [Install]
473 WantedBy=multi-user.target
474 EOM
475
476 # Create flush-table script called by iptables service
477 cat <<EOM >$R/etc/iptables/flush-iptables.sh
478 #!/bin/sh
479 iptables -F
480 iptables -X
481 iptables -t nat -F
482 iptables -t nat -X
483 iptables -t mangle -F
484 iptables -t mangle -X
485 iptables -P INPUT ACCEPT
486 iptables -P FORWARD ACCEPT
487 iptables -P OUTPUT ACCEPT
488 EOM
489
490 # Create iptables rule file
491 cat <<EOM >$R/etc/iptables/iptables.rules
492 *filter
493 :INPUT DROP [0:0]
494 :FORWARD DROP [0:0]
495 :OUTPUT ACCEPT [0:0]
496 :TCP - [0:0]
497 :UDP - [0:0]
498 :SSH - [0:0]
499
500 # Rate limit ping requests
501 -A INPUT -p icmp --icmp-type echo-request -m limit --limit 30/min --limit-burst 8 -j ACCEPT
502 -A INPUT -p icmp --icmp-type echo-request -j DROP
503
504 # Accept established connections
505 -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
506
507 # Accept all traffic on loopback interface
508 -A INPUT -i lo -j ACCEPT
509
510 # Drop packets declared invalid
511 -A INPUT -m conntrack --ctstate INVALID -j DROP
512
513 # SSH rate limiting
514 -A INPUT -p tcp --dport ssh -m conntrack --ctstate NEW -j SSH
515 -A SSH -m recent --name sshbf --rttl --rcheck --hitcount 3 --seconds 10 -j DROP
516 -A SSH -m recent --name sshbf --rttl --rcheck --hitcount 20 --seconds 1800 -j DROP
517 -A SSH -m recent --name sshbf --set -j ACCEPT
518
519 # Send TCP and UDP connections to their respective rules chain
520 -A INPUT -p udp -m conntrack --ctstate NEW -j UDP
521 -A INPUT -p tcp --syn -m conntrack --ctstate NEW -j TCP
522
523 # Reject dropped packets with a RFC compliant responce
524 -A INPUT -p udp -j REJECT --reject-with icmp-port-unreachable
525 -A INPUT -p tcp -j REJECT --reject-with tcp-rst
526 -A INPUT -j REJECT --reject-with icmp-proto-unreachable
527
528 ## TCP PORT RULES
529 # -A TCP -p tcp -j LOG
530
531 ## UDP PORT RULES
532 # -A UDP -p udp -j LOG
533
534 COMMIT
535 EOM
536
537 # Reload systemd configuration and enable iptables service
538 LANG=C chroot $R systemctl daemon-reload
539 LANG=C chroot $R systemctl enable iptables.service
540
541 if [ "$ENABLE_IPV6" = true ] ; then
542 # Create ip6tables systemd service
543 cat <<EOM >$R/etc/systemd/system/ip6tables.service
544 [Unit]
545 Description=Packet Filtering Framework
546 DefaultDependencies=no
547 After=systemd-sysctl.service
548 Before=sysinit.target
549 [Service]
550 Type=oneshot
551 ExecStart=/sbin/ip6tables-restore /etc/iptables/ip6tables.rules
552 ExecReload=/sbin/ip6tables-restore /etc/iptables/ip6tables.rules
553 ExecStop=/etc/iptables/flush-ip6tables.sh
554 RemainAfterExit=yes
555 [Install]
556 WantedBy=multi-user.target
557 EOM
558
559 # Create ip6tables file
560 cat <<EOM >$R/etc/iptables/flush-ip6tables.sh
561 #!/bin/sh
562 ip6tables -F
563 ip6tables -X
564 ip6tables -Z
565 for table in $(</proc/net/ip6_tables_names)
566 do
567 ip6tables -t \$table -F
568 ip6tables -t \$table -X
569 ip6tables -t \$table -Z
570 done
571 ip6tables -P INPUT ACCEPT
572 ip6tables -P OUTPUT ACCEPT
573 ip6tables -P FORWARD ACCEPT
574 EOM
575
576 # Create ip6tables rule file
577 cat <<EOM >$R/etc/iptables/ip6tables.rules
578 *filter
579 :INPUT DROP [0:0]
580 :FORWARD DROP [0:0]
581 :OUTPUT ACCEPT [0:0]
582 :TCP - [0:0]
583 :UDP - [0:0]
584 :SSH - [0:0]
585
586 # Drop packets with RH0 headers
587 -A INPUT -m rt --rt-type 0 -j DROP
588 -A OUTPUT -m rt --rt-type 0 -j DROP
589 -A FORWARD -m rt --rt-type 0 -j DROP
590
591 # Rate limit ping requests
592 -A INPUT -p icmpv6 --icmpv6-type echo-request -m limit --limit 30/min --limit-burst 8 -j ACCEPT
593 -A INPUT -p icmpv6 --icmpv6-type echo-request -j DROP
594
595 # Accept established connections
596 -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
597
598 # Accept all traffic on loopback interface
599 -A INPUT -i lo -j ACCEPT
600
601 # Drop packets declared invalid
602 -A INPUT -m conntrack --ctstate INVALID -j DROP
603
604 # SSH rate limiting
605 -A INPUT -p tcp --dport ssh -m conntrack --ctstate NEW -j SSH
606 -A SSH -m recent --name sshbf --rttl --rcheck --hitcount 3 --seconds 10 -j DROP
607 -A SSH -m recent --name sshbf --rttl --rcheck --hitcount 20 --seconds 1800 -j DROP
608 -A SSH -m recent --name sshbf --set -j ACCEPT
609
610 # Send TCP and UDP connections to their respective rules chain
611 -A INPUT -p udp -m conntrack --ctstate NEW -j UDP
612 -A INPUT -p tcp --syn -m conntrack --ctstate NEW -j TCP
613
614 # Reject dropped packets with a RFC compliant responce
615 -A INPUT -p udp -j REJECT --reject-with icmp6-adm-prohibited
616 -A INPUT -p tcp -j REJECT --reject-with icmp6-adm-prohibited
617 -A INPUT -j REJECT --reject-with icmp6-adm-prohibited
618
619 ## TCP PORT RULES
620 # -A TCP -p tcp -j LOG
621
622 ## UDP PORT RULES
623 # -A UDP -p udp -j LOG
624
625 COMMIT
626 EOM
627
628 # Reload systemd configuration and enable iptables service
629 LANG=C chroot $R systemctl daemon-reload
630 LANG=C chroot $R systemctl enable ip6tables.service
631
632 fi
633 fi
634
635 # Unmount mounted filesystems
636 umount -l $R/proc
637 umount -l $R/sys
638
639 # Clean up files
640 rm -f $R/etc/apt/sources.list.save
641 rm -f $R/etc/resolvconf/resolv.conf.d/original
642 rm -rf $R/run
643 mkdir -p $R/run
644 rm -f $R/etc/*-
645 rm -f $R/root/.bash_history
646 rm -rf $R/tmp/*
647 rm -f $R/var/lib/urandom/random-seed
648 [ -L $R/var/lib/dbus/machine-id ] || rm -f $R/var/lib/dbus/machine-id
649 rm -f $R/etc/machine-id
650
651 # Calculate size of the chroot directory
652 CHROOT_SIZE=$(expr `du -s $R | awk '{ print $1 }'` / 1024)
653
654 # Calculate required image size
655 IMAGE_SIZE=`expr $(expr ${CHROOT_SIZE} / 1024 + 1) \* 1024`
656
657 # Calculate number of sectors for the partition
658 IMAGE_SECTORS=`expr $(expr ${IMAGE_SIZE} \* 1048576) / 512 - 133120`
659
660 # Prepare date string for image file name
661 DATE="$(date +%Y-%m-%d)"
662
663 # Prepare image file
664 dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}.img" bs=1M count=1
665 dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}.img" bs=1M count=0 seek=${IMAGE_SIZE}
666
667 # Write partition table
668 sfdisk -q -L -f "$BASEDIR/${DATE}-debian-${RELEASE}.img" <<EOM
669 unit: sectors
670
671 1 : start= 2048, size= 131072, Id= c, bootable
672 2 : start= 133120, size= ${IMAGE_SECTORS}, Id=83
673 3 : start= 0, size= 0, Id= 0
674 4 : start= 0, size= 0, Id= 0
675 EOM
676
677 # Set up temporary loop devices and build filesystems
678 VFAT_LOOP="$(losetup -o 1M --sizelimit 64M -f --show $BASEDIR/${DATE}-debian-${RELEASE}.img)"
679 EXT4_LOOP="$(losetup -o 65M --sizelimit `expr ${IMAGE_SIZE} - 64`M -f --show $BASEDIR/${DATE}-debian-${RELEASE}.img)"
680 mkfs.vfat "$VFAT_LOOP"
681 mkfs.ext4 "$EXT4_LOOP"
682
683 # Mount the temporary loop devices
684 mkdir -p "$BUILDDIR/mount"
685 mount "$EXT4_LOOP" "$BUILDDIR/mount"
686
687 mkdir -p "$BUILDDIR/mount/boot/firmware"
688 mount "$VFAT_LOOP" "$BUILDDIR/mount/boot/firmware"
689
690 # Copy all files from the chroot to the loop device mount point directory
691 rsync -a "$R/" "$BUILDDIR/mount/"
692
693 # Unmount all temporary loop devices and mount points
694 cleanup
695
696 # (optinal) create block map file for "bmaptool"
697 bmaptool create -o "$BASEDIR/${DATE}-debian-${RELEASE}.bmap" "$BASEDIR/${DATE}-debian-${RELEASE}.img"
698
699 # Image was successfully created
700 echo "$BASEDIR/${DATE}-debian-${RELEASE}.img (${IMAGE_SIZE})" ": successfully created"
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