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Old 02-28-2010, 05:25 AM
lakshmi pathi
 
Default ext3 file hide

Hi all,
I was thinking about file hiding in ext3 and thought about this method. I want know whether this will work or not.

1. creat an immutable file (/usr/share/exthide/file1.txt)* with content "Tool to hide files"


2. Now creat an symbolic link (exthide.tmp) to (/usr/share/exthide/file1.txt)

3. Now get file that needs to be hidden from user. (/home/laks/userfile.txt)

4. Get user files (/home/laks/userfile.txt) inode,assume it is small-sized file( that if i_block[13] !=0 , then exit)* copy block number at i_block[0]* to i_block[13] and i_size to i_block[14]


5. Now Get exthide.tmp's (symbolic link) i_block[0] value and assign it to i_block[0]* of /home/laks/userfile.txt
** and assign exthide.tmp i_size and i_mode to /home/laks/userfile.txt inode's size and mode.

* ( or should i leave /home/laks/userfile.txt inode's i_size to its original value ?)

6. Now move to /home/laks/userfile.txt* 's directory (ie /home/laks) and change this userfile.txt file type as 7 and write this parent inode.


Thus the file /home/laks/userfile.txt content is hidden now,Since* /home/laks/userfile.txt file type is set as symbolic link and points to (/usr/share/exthide/file1.txt).

If user wants to view hidden file , then again copy back blocks number from i_block[13] to i_block[0] and set file type as regular in inode and pareant inode.


Do you think , this method will work ? or It has serious issues ?
--
----
Cheers,
Lakshmipathi.G
FOSS Programmer.
www.giis.co.in

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