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Made filesystem read-only
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Sun Knudsen
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@ -2,7 +2,7 @@
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Title: How to create encrypted paper backup
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Description: Learn how to create encrypted paper backup.
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Author: Sun Knudsen <https://github.com/sunknudsen>
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Contributors: Sun Knudsen <https://github.com/sunknudsen>, Alex Anderson <https://github.com/Serpent27>
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Contributors: Sun Knudsen <https://github.com/sunknudsen>, Alex Anderson <https://github.com/Serpent27>, Nico Kaiser <https://github.com/nicokaiser>
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Reviewers:
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Publication date: 2021-02-23T21:53:38.495Z
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Listed: true
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@ -54,6 +54,10 @@ $ git clone https://github.com/adafruit/Raspberry-Pi-Installer-Scripts.git
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$ cd Raspberry-Pi-Installer-Scripts
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$ sudo python3 adafruit-pitft.py --display=28c --rotation=90 --install-type=console
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$ cd ~
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$ rm -fr Raspberry-Pi-Installer-Scripts
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```
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#### Disable console auto login
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@ -87,9 +91,7 @@ $ sudo apt install -y fim imagemagick zbar-tools
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$ pip3 install pillow qrcode --user
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$ echo "export GPG_TTY=\"\$(tty)\"" >> ~/.bashrc
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$ echo "export PATH=\$PATH:/home/pi/.local/bin" >> ~/.bashrc
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$ echo -e "export GPG_TTY=\"\$(tty)\"\nexport PATH=\$PATH:/home/pi/.local/bin" >> ~/.bashrc
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$ source ~/.bashrc
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```
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@ -128,20 +130,127 @@ sudo curl -o /usr/local/sbin/secure-erase.sh https://sunknudsen.com/static/media
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sudo chmod +x /usr/local/sbin/secure-erase.sh
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```
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### Step 10: disable Wi-Fi (if not using ethernet) or disconnect ethernet cable
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### Step 10: make filesystem read-only
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> WARNING: DO NOT CONNECT RASPBERRY PI TO NETWORK EVER AGAIN WITHOUT REINSTALLING RASPBERRY PI OS FIRST (DEVICE IS NOW “COLD”).
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> Heads-up: shout-out to Nico Kaiser for his amazing [guide](https://gist.github.com/nicokaiser/08aa5b7b3958f171cf61549b70e8a34b) on how to configure a read-only Raspberry Pi.
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#### Disable swap
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```shell
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sudo dphys-swapfile swapoff
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sudo dphys-swapfile uninstall
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sudo systemctl disable dphys-swapfile.service
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```
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#### Remove `dphys-swapfile` `fake-hwclock` and `logrotate`
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```shell
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sudo apt remove -y --purge dphys-swapfile fake-hwclock logrotate
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```
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#### Link `/etc/console-setup` to `/tmp/console-setup`
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```shell
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sudo mv /etc/console-setup /tmp/console-setup
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sudo ln -s /tmp/console-setup /etc/console-setup
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```
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#### Link `/etc/resolv.conf` to `/tmp/resolv.conf`
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```shell
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sudo mv /etc/resolv.conf /tmp/resolv.conf
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sudo ln -s /tmp/resolv.conf /etc/resolv.conf
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```
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#### Link `/home/pi/.gnupg` to `/tmp/pi/.gnupg`
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```shell
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mkdir -m 700 /tmp/pi
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mv /home/pi/.gnupg /tmp/pi/.gnupg
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ln -s /tmp/pi/.gnupg /home/pi/.gnupg
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```
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#### Enable `tmp.mount`
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```shell
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echo -e "D /tmp 1777 root root -\nD /tmp/console-setup 1700 root root -\nD /tmp/pi 1700 pi pi -\nD /tmp/pi/.gnupg 1700 pi pi -\nD /var/tmp 1777 root root -" | sudo tee /etc/tmpfiles.d/tmp.conf
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sudo cp /usr/share/systemd/tmp.mount /etc/systemd/system/
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sudo systemctl enable tmp.mount
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```
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#### Edit `/boot/cmdline.txt`
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```shell
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sudo cp /boot/cmdline.txt /boot/cmdline.txt.backup
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sudo sed -i 's/fsck.repair=yes/fsck.repair=skip/' /boot/cmdline.txt
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sudo sed -i '$ s/$/ noswap ro systemd.volatile=state/' /boot/cmdline.txt
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```
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#### Edit `/etc/fstab`
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```shell
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sudo cp /etc/fstab /etc/fstab.backup
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sudo sed -i -e 's/vfat\s*defaults\s/vfat defaults,ro/' /etc/fstab
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sudo sed -i -e 's/ext4\s*defaults,noatime\s/ext4 defaults,noatime,ro,noload/' /etc/fstab
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```
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#### Disable `/boot` macOS `fseventsd` logging and Spotlight indexing
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```shell
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sudo touch /boot/.metadata_never_index
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sudo mkdir -p /boot/.fseventsd
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sudo touch /boot/.fseventsd/no_log
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```
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### Step 11: disable Wi-Fi (if not using ethernet) or disconnect ethernet cable
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```shell
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echo "dtoverlay=disable-wifi" | sudo tee -a /boot/config.txt
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```
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### Step 11: reboot
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### Step 12: reboot
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```shell
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sudo systemctl reboot
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```
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> WARNING: DO NOT CONNECT RASPBERRY PI TO NETWORK EVER AGAIN WITHOUT REINSTALLING RASPBERRY PI OS FIRST (DEVICE IS NOW "READ-ONLY" AND “COLD”).
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### Step 13 (optional): compute SHA512 hash of SD card and store in password manager (on macOS)
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Run `diskutil list` to find disk ID of SD card with “Raspberry Pi OS Lite” installed (`disk2` in the following example).
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```console
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$ diskutil list
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/dev/disk0 (internal, physical):
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#: TYPE NAME SIZE IDENTIFIER
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0: GUID_partition_scheme *500.3 GB disk0
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1: EFI EFI 209.7 MB disk0s1
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2: Apple_APFS Container disk1 500.1 GB disk0s2
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/dev/disk1 (synthesized):
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#: TYPE NAME SIZE IDENTIFIER
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0: APFS Container Scheme - +500.1 GB disk1
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Physical Store disk0s2
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1: APFS Volume Macintosh HD - Data 340.9 GB disk1s1
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2: APFS Volume Preboot 85.9 MB disk1s2
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3: APFS Volume Recovery 529.0 MB disk1s3
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4: APFS Volume VM 3.2 GB disk1s4
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5: APFS Volume Macintosh HD 11.3 GB disk1s5
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/dev/disk2 (internal, physical):
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#: TYPE NAME SIZE IDENTIFIER
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0: FDisk_partition_scheme *15.9 GB disk2
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1: Windows_FAT_32 boot 268.4 MB disk2s1
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2: Linux 15.7 GB disk2s2
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$ sudo diskutil unmountDisk /dev/diskn (if previous step fails)
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Unmount of all volumes on disk2 was successful
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$ sudo openssl dgst -sha512 /dev/rdisk2
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SHA512(/dev/rdisk3)= 353af7e9bd78d7d98875f0e2a58da3d7cdfc494f2ab5474b2ab4a8fd212ac6a37c996d54f6c650838adb61e4b30801bcf1150081f6dbb51998cf33a74fa7f0fe
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```
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👍
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---
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@ -35,8 +35,8 @@ normal=$(tput sgr0)
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basedir=$(dirname "$0")
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dev="/dev/sda1"
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tmp="/home/pi/tmp"
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usb="/home/pi/usb"
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tmp="/tmp/pi"
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usb="/tmp/usb"
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tput reset
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@ -60,11 +60,6 @@ if [ "$answer" = "y" ]; then
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sudo mkfs -t vfat $dev
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fi
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sudo mkdir -p $tmp
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if ! mount | grep $tmp > /dev/null; then
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sudo mount -t tmpfs -o size=100m tmp $tmp
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fi
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sudo mkdir -p $usb
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if ! mount | grep $usb > /dev/null; then
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sudo mount $dev $usb -o uid=pi,gid=pi
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@ -131,8 +126,6 @@ if [ "$answer" = "y" ]; then
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sudo fim --autozoom --quiet --vt 1 "$tmp/secret-hash.png"
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fi
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sudo umount $tmp
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sudo umount $usb
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printf "%s\n" "Done"
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