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 ?
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Cheers,
Lakshmipathi.G
FOSS Programmer.
www.giis.co.in
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