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 Forum index » Advanced Topics » Cutting edge
creating and mounting of encrypted savefiles in ext3 + ext4
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Karl Godt


Joined: 20 Jun 2010
Posts: 3972
Location: Kiel,Germany

PostPosted: Sun 23 Oct 2011, 21:22    Post_subject:  creating and mounting of encrypted savefiles in ext3 + ext4  

I am not the fastest and the brightest , but it seems that i got it working to run on aes heavy encrypted savefiles .

[edit=2011-10-27]
TARBALL deleted due to the BUG in POST #2
ACTUAL TARBALL @ POST #3

The tarball is modified to create also ext4 savefiles and to create both ext3 and ext4 savefiles in both encryptions : '-E 1' and '-e aes' at shutdown from PUPMODE=5 .

and to mount these correctly at boot .
[/edit]

rc.shutdown and init are from DISTRO_NAME='Drake Puppy' DISTRO_VERSION=0.3 from summer this year -- so not the newest !!

I have only tested it several boots for an aes encrypted ext3 savefile today and it works .
I still have to test the three other possibilities aes|ext4 cryptoloop|ext3|ext4 and of course would need on ext2 again also .

Bug reports welcome !

Edited_time_total
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Karl Godt


Joined: 20 Jun 2010
Posts: 3972
Location: Kiel,Germany

PostPosted: Mon 24 Oct 2011, 07:35    Post_subject:  

BUG for ext4 :

The saving to the save file did not work due to the default definitions in the PUPMODE=128 case :

Code:
@@ -883,11 +939,13 @@ case $PUPMODE in
   echo "Saving session to $SAVEFILE file on $SAVEPART partition..." >/dev/console
   mkdir /tmp/save1stpup
   echo -n "Mounting ${SAVEFILE}..."
-  FILEFS="ext3"
+  FILEFS="ext4"
+  [ ! "`echo -n "$SAVEFILE" | grep "3fs"`" = "" ] && FILEFS="ext3"
   [ ! "`echo -n "$SAVEFILE" | grep "2fs"`" = "" ] && FILEFS="ext2"
 
   if [ "$CRYPTO" = "" ];then

The line numbers 883/939 may not be correct , due to other added lines by me .

I just add this short notice for preventing disappointments Laughing

I now know how it is to boot an empty save-file with the
^update feature of /etc/rc.d/rc.update ^ :
no wallpaper because rox refuses to work with .jpg , only few icons in /usr/local/lib/X11/pixmaps , only few icons show in /usr/share/applications ... Shocked Laughing

NeverTheLess :
/dev/loop1 on /initrd/pup_rw type ext4 (rw,noatime,user_xattr,barrier=1,data=ordered)
PREVUNIONRECORD=''
LASTUNIONRECORD='drakesave_crypta-ext4_II.4fs puppy_drake_0.3.sfs'
EXTRASFSLIST='devx_drake_0.3.sfs'

[edit=2011-10-27]
Newer Tarball in Post #3 below
[/edit]

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Karl Godt


Joined: 20 Jun 2010
Posts: 3972
Location: Kiel,Germany

PostPosted: Wed 26 Oct 2011, 12:24    Post_subject:  

So far everything sorks :
Booted an one year old puppy-luma-001
PREVUNIONRECORD='lumasave_cryptx-ext3_x_I.3fs puppy_luma_0.0.1.sfs'
LASTUNIONRECORD='lumasave_cryptx-ext3_x_I.3fs puppy_luma_0.0.1.sfs'
/dev/loop1 on /initrd/pup_rw type ext3 (rw,noatime,errors=continue,barrier=0,data=ordered)

The namings had changed in the DISTRO_SPECS file and it took me some time to figure it out .

What I can tell is , that the cryptx file gets mounted , even if no cryptoloop.ko inserted ( /etc/modules/DOTconfig-k2.6.33.2-27MAY2010-LUPU-SMP-TICKLESS ) . I could `ls` the files in the cryptx save-file with no problems from the pfix=rdsh ( used the drake-initrd.gz without adjusting the modules )
After I changed the kernel to the drake kernel :
# lsmod
Module Size Used by
cryptoloop 1523 0
fuse 47824 0
aufs 120713 33
squashfs 19321 1
floppy 42115 0
# mount
rootfs on / type rootfs (rw,relatime)
/dev/sda1 on /initrd/mnt/dev_save type ext2 (rw,noatime,errors=continue)
/dev/loop1 on /initrd/pup_rw type ext3 (rw,noatime,errors=continue,barrier=0,data=ordered)
/dev/loop0 on /initrd/pup_ro2 type squashfs (ro,noatime)
unionfs on / type aufs (rw,relatime,si=4c078e37)
tmpfs on /tmp type tmpfs (rw,relatime,size=622264k)
none on /proc type proc (rw,relatime)
none on /dev/pts type devpts (rw,relatime,gid=2,mode=620)
none on /sys type sysfs (rw,relatime)
shmfs on /dev/shm type tmpfs (rw,relatime,size=107716k)

it booted to desktop Very Happy

below the fixed files needed for all this , will delete the two attachments in the posts above tomorrow
Encrypted_files-FIXED-II.tar.bz2
Description  tar -tjf /root/Encrypted_files-FIXED-II.tar.bz2 | sort -d | cut -f 2 -d '/
init
init.FIXED-II.diff
init-orig
rc.shutdown
rc.shutdown.FIXED-II.diff
rc.shutdown-orig
bz2

 Download 
Filename  Encrypted_files-FIXED-II.tar.bz2 
Filesize  47 KB 
Downloaded  172 Time(s) 
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