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Merge pull request #128 from SolidHal/tslilc-pr-crypto
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Merge #127 into master along with fixes
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SolidHal authored Oct 18, 2019
2 parents 677742a + c899575 commit 35913ee
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11 changes: 6 additions & 5 deletions DOCUMENTATION.md
Original file line number Diff line number Diff line change
Expand Up @@ -119,16 +119,17 @@ The initramfs is what runs initialy at boot, and allows us to enter a password a

In a normal system, when dmcrypt/LUKS is setup the initramfs image is modified to enable decrypting of the root partiton

Since we have to have a static initramfs image, and can't change it without recompiling the kernel, we have to be a little crafty to support unencrypted and encrypted root partitons with the same initramfs
Since we have to have a static initramfs image, and can't change it without recompiling the kernel, we detect whether encryption is in use by checking for the tag `crypto_LUKS` on the root device at boot.

This is achieved by placing flags in the /boot partition, aka `/dev/mmcblk2p2` or `/dev/sda2`. The /boot partiton is empty on an unencrypted system. When root encryption is set up, the file `root_encryption` is created, which the initramfs init script uses to determine that it should try and decrypt the root partiton

### debugging the init script
A rescue debug shell is entered when the init script encounters a problem, or if the `debug` flag is set
A rescue debug shell is entered when the init script encounters a problem, or if a device with the partition label `RESCUESHELL` is present

You can enable the debug flag by mounting /boot and creating a file named `debug`
Label any partition on the system with `RESCUESHELL` to enter the initramfs rescue shell before mount and root_switch.

To make the system boot normally, from the debug prompt, run `rm /boot/debug` and `exit` to reboot
You can do this with `cgpt add -i 1 -l RESCUESHELL /dev/sda` for example to label the first partiton of a usb drive.

This is the suggested method, as then debugging can be enabled/disabled by plugging in/removing the usb device.



2 changes: 1 addition & 1 deletion README.md
Original file line number Diff line number Diff line change
Expand Up @@ -99,7 +99,7 @@ _This will show a bunch of scary red warnings that are a result of the emmc (int

#### Setting up root partition encryption
PrawnOS supports encrypting the full root partition with the use of a custom initramfs and dmcrypt/LUKS
Press "Y" at the prompt, type "YES" at the following prompt, then enter the password you would like to use and verify it
Type "Yes" at the prompt, then enter the password you would like to use and verify it
You will then be prompted one more time to enter your encryption password to mount and setup the filesystem
If you are curious how the initramfs, and root partition encryption work on PrawnOS check out the Initramfs and Encryption section in [DOCUMENTATION.md](DOCUMENTATION.md)

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13 changes: 9 additions & 4 deletions makefile
Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,8 @@ clean:
@echo " clean_kernel - which deletes the untar'd kernel folder from build"
@echo " clean_ath - which deletes the untar'd ath9k driver folder from build"
@echo " clean_img - which deletes the built PrawnOS image, this is ran when make image is ran"
@echo " clean_fs - which deletes the built PrawnOS base image"
@echo " clean_basefs - which deletes the built PrawnOS base image"
@echo " clean_initramfs - which deletes the built PrawnOS initramfs image that gets injected into the kernel"
@echo " clean_all - which does all of the above"
@echo " in most cases none of these need to be used manually as most cleanup steps are handled automatically"

Expand All @@ -54,16 +55,21 @@ clean_ath:
clean_img:
rm -f $(OUTNAME)

.PHONY: clean_fs
clean_fs:
.PHONY: clean_basefs
clean_basefs:
rm -r $(BASE)

.PHONY: clean_initramfs
clean_initramfs:
rm -r build/PrawnOS-initramfs.cpio.gz

.PHONY: clean_all
clean_all:
make clean_kernel
make clean_ath
make clean_img
make clean_fs
make clean_initramfs


.PHONY: kernel
Expand Down Expand Up @@ -99,7 +105,6 @@ image:
cp $(BASE) $(OUTNAME)
make kernel_inject


.PHONY: live_image
live_image:
echo "TODO"
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24 changes: 12 additions & 12 deletions resources/BuildResources/initramfs-init
Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@ echo In PrawnOS Init
rescue_shell() {
[ "{$1}" != "debug" ] && echo "Something went wrong. Dropping to a shell." > /dev/tty1
[ "{$1}" == "debug" ] && echo "Debug flag detected, entering debug shell" > /dev/tty1
echo "Something went wrong. Dropping to a shell." > /dev/tty1
exec setsid /bin/sh -c 'exec /bin/sh </dev/tty1 >/dev/tty1 2>&1'
}

Expand All @@ -44,7 +45,7 @@ rootpartuuid() {
[ "${value}" != "" ] && echo "${value}"
}

# mount the bare necesities
# mount the bare necesities
mount -n -t proc proc /proc
mount -n -t sysfs sysfs /sys
mount -n -t devtmpfs devtmpfs /dev
Expand All @@ -65,28 +66,27 @@ echo ${ROOT_DEV} > /dev/tty1
# the next boot stage
CMDLINE='cat /proc/cmdline'

[ -d "/boot" ] || mkdir -p /boot
mount ${ROOT_DEV}2 /boot

#Debugging can be facilitated by creating /boot/debug
[ -f "/boot/debug" ] && rescue_shell debug
# label any partition on the system with RESCUESHELL to enter the initramfs rescue shell before mount and root_switch.
# you can do this with "cgpt add -i 1 -l RESCUESHELL /dev/sda" for example to label the first partiton of a usb drive.
if [ -n "$(blkid | grep RESCUESHELL)" ]
then
rescue_shell debug
fi

if [ -f "/boot/root_encryption" ]
if [ -n "$(blkid ${ROOT_DEV}2 | grep crypto_LUKS)" ]
then
#decrypt and mount the root filesystem
echo "Opening encrypted root partition, this will take 30s..."
cryptsetup --tries 5 luksOpen ${ROOT_DEV}3 luksroot || rescue_shell debug
cryptsetup --tries 5 luksOpen ${ROOT_DEV}2 luksroot || rescue_shell
mount /dev/mapper/luksroot /newroot
else
# mount the unencrypted root filesystem
[ -d "/newroot" ] || mkdir -p /newroot
mount ${ROOT_DEV}3 /newroot
mount ${ROOT_DEV}2 /newroot
fi

umount /sys
umount /proc



#swith to the new rootfs
#switch to the new rootfs
exec switch_root /newroot /sbin/init ${CMDLINE}
142 changes: 142 additions & 0 deletions resources/BuildResources/linux-libre-signing-key.gpg
Original file line number Diff line number Diff line change
@@ -0,0 +1,142 @@
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Version: GnuPG v1.4.9 (GNU/Linux)

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3 changes: 1 addition & 2 deletions resources/InstallResources/mmc.partmap
Original file line number Diff line number Diff line change
Expand Up @@ -6,5 +6,4 @@ first-lba: 34
last-lba: 30785502

/dev/mmcblk2p1 : start= 20480, size= 65536, type=FE3A2A5D-4F32-41A7-B725-ACCC3285A309, uuid=89B31CDB-1147-5241-8271-C1ADBB9BBB44, name="Kernel", attrs="GUID:49,51,52,54,56"
/dev/mmcblk2p2 : start= 86016, size= 976562, name="Boot"
/dev/mmcblk2p3 : start= 1062578, size= 29722924, type=EBD0A0A2-B9E5-4433-87C0-68B6B72699C7, uuid=63DB8E49-63C4-984E-90A0-8AC3222C4771, name="Root"
/dev/mmcblk2p2 : start= 86016, size= 30699486, type=EBD0A0A2-B9E5-4433-87C0-68B6B72699C7, uuid=63DB8E49-63C4-984E-90A0-8AC3222C4771, name="Root"
4 changes: 1 addition & 3 deletions resources/InstallResources/mmc_type2.partmap
Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@

label: gpt
label-id: EBA5A923-2F33-7C4E-AC9A-1555FD600D19
device: /dev/mmcblk2
Expand All @@ -7,5 +6,4 @@ first-lba: 34
last-lba: 30777310

/dev/mmcblk2p1 : start= 20480, size= 65536, type=FE3A2A5D-4F32-41A7-B725-ACCC3285A309, uuid=89B31CDB-1147-5241-8271-C1ADBB9BBB44, name="Kernel", attrs="GUID:49,51,52,54,56"
/dev/mmcblk2p2 : start= 86016, size= 976562, name="Boot"
/dev/mmcblk2p3 : start= 1062578, size= 29714732, type=EBD0A0A2-B9E5-4433-87C0-68B6B72699C7, uuid=63DB8E49-63C4-984E-90A0-8AC3222C4771, name="Root"
/dev/mmcblk2p2 : start= 86016, size= 30691294, type=EBD0A0A2-B9E5-4433-87C0-68B6B72699C7, uuid=63DB8E49-63C4-984E-90A0-8AC3222C4771, name="Root"
6 changes: 4 additions & 2 deletions scripts/InstallScripts/ExpandExternalInstall.sh
Original file line number Diff line number Diff line change
Expand Up @@ -39,12 +39,13 @@ then
sgdisk -N 2 /dev/sda
#Set the type to "data"
sgdisk -t 2:0700 /dev/sda
#Name is "properly" - Probably not required, but looks nice
#Name it "properly" - Probably not required, but looks nice
sgdisk -c 2:Root /dev/sda
#Reload the partition mapping
partprobe /dev/sda
#Force the filesystem to fill the new partition
resize2fs -f /dev/sda2
echo "/dev/sda2 / ext4 defaults,noatime 0 1" > /etc/fstab
fi

if [ "$TARGET" = "SD" ]
Expand All @@ -56,10 +57,11 @@ then
sgdisk -N 2 /dev/mmcblk0
#Set the type to "data"
sgdisk -t 2:0700 /dev/mmcblk0
#Name is "properly" - Probably not required, but looks nice
#Name it "properly" - Probably not required, but looks nice
sgdisk -c 2:Root /dev/mmcblk0
#Reload the partition mapping
partprobe /dev/mmcblk0
#Force the filesystem to fill the new partition
resize2fs -f /dev/mmcblk0p2
echo "/dev/mmcblk1p2 / ext4 defaults,noatime 0 1" > /etc/fstab
fi
15 changes: 3 additions & 12 deletions scripts/InstallScripts/InstallToInternal.sh
Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,7 @@

RESOURCES=/InstallResources
# Grab the boot device, which is either /dev/sda for usb or /dev/mmcblk0 for an sd card
BOOT_DEVICE=$(mount | head -n 1 | cut -d '3' -f 1)
BOOT_DEVICE=$(mount | head -n 1 | cut -d '2' -f 1)

echo "--------------------------------------------------------------------------------------------------------"
echo "PrawnOS Install To Internal Emmc Script"
Expand All @@ -36,7 +36,6 @@ then
dmesg -D
umount /dev/mmcblk2p1 || /bin/true
umount /dev/mmcblk2p2 || /bin/true
umount /dev/mmcblk2p3 || /bin/true

echo Writing partition map
DISK_SZ="$(blockdev --getsz /dev/mmcblk2)"
Expand Down Expand Up @@ -73,15 +72,9 @@ then
dd if=/dev/zero of=/dev/mmcblk2p1 bs=512 count=65536
dd if="$BOOT_DEVICE"1 of=/dev/mmcblk2p1

BOOT_DEV_NAME=mmcblk2p2
ROOT_DEV_NAME=mmcblk2p3
ROOT_DEV_NAME=mmcblk2p2
CRYPTO=false

#ready /boot
mkfs.ext4 -F -b 1024 /dev/$BOOT_DEV_NAME
mkdir -p /mnt/boot
mount /dev/$BOOT_DEV_NAME /mnt/boot

#Handle full disk encryption
echo "Would you like to setup full disk encrytion using LUKs/DmCrypt?"
select yn in "Yes" "No"
Expand All @@ -96,8 +89,6 @@ then
echo "Now unlock the newly created encrypted root partition so we can mount it and install the filesystem"
cryptsetup luksOpen /dev/$ROOT_DEV_NAME luksroot || exit 1
ROOT_DEV_NAME=mapper/luksroot
#set the root encryption flag
touch /mnt/boot/root_encryption
break
;;
No,*|*,No )
Expand All @@ -120,7 +111,7 @@ then
then
echo "/dev/mapper/luksroot / ext4 defaults,noatime 0 1" > /mnt/mmc/etc/fstab
else
echo "/dev/mmcblk2p3 / ext4 defaults,noatime 0 1" > /mnt/mmc/etc/fstab
echo "/dev/mmcblk2p2 / ext4 defaults,noatime 0 1" > /mnt/mmc/etc/fstab
fi
umount /dev/$ROOT_DEV_NAME
echo Running fsck
Expand Down
1 change: 1 addition & 0 deletions scripts/InstallScripts/UpgradeKernel.sh
Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@ echo
if [[ $REPLY =~ ^[Yy]$ ]]
then
echo Writing kernel partition
dd if=/dev/zero of=/dev/mmcblk2p1 bs=512 count=65536
dd if="$BOOT_DEVICE"1 of=/dev/mmcblk2p1
echo You can now reboot
fi
Expand Down
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