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Top Forums Shell Programming and Scripting auto encryption and decryption of files during log in and log off Post 302707753 by jim mcnamara on Saturday 29th of September 2012 10:46:53 PM
Old 09-29-2012
How about an encrypted file system? You need a password to work on the files.
This is a far more sensible approach. We had this long ago at Los Alamos National Labs (NM, USA) where security followed Orange book B requirements. That is FAR more stringent than anything you can afford to implement.

What you are doing is probably ill-conceived, and motivations are good, but Don Cragun was too polite to say that.

consider this free toolkit for Linux, other OS software exists, too:

Filesystem Encryption Tools for Linux

The probability of you getting this requirement to work is low, and getting it to work flawlessly is very low, IMO. It has to be done at a very low level (kernel mode or in filesystem drivers), not with shell scripts. The probability is high that you will irreversibly damage files. And if accidentally you do that to system files, you lose the whole system. If you do proceed with your shell script approach, be very scrupulous about backing up files, because you will definitely have problems.

Just my opinion, trying to prevent big problems for you. Not trying to squash innovation.
 

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BF_TAR(1)																 BF_TAR(1)

NAME
bf_tar - shell script to write a tar file of a bogofilter directory to stdout SYNOPSIS
bf_tar [-r] [-R] bogofilter_directory DESCRIPTION
bf_tar bundles a bogofilter working directory in tar format and copies it to standard output (your console, or where you redirect it, see EXAMPLES below). OPTIONS
The -r option causes bf_tar to remove inactive log files after the archive has been written successfully. The default is to leave log files. The -R option causes bf_tar to remove inactive log files before the archive is written. This may reduce chances that the resulting archive is recoverable should it become damaged. The archive may be smaller though. The default is to leave log files. EXIT STATUS
The script exits with status code 0 if everything went well, and nonzero if it encountered trouble. EXAMPLES
o bf_tar ~/.bogofilter > outfile.tar Writes a standard .tar file containing the essential files from ~/.bogofilter to outfile.tar. o bf_tar ~/.bogofilter | gzip -9 -c > outfile.tar.gz Writes a gzipped .tar.gz file containing the essential files from ~/.bogofilter to outfile.tar.gz. o bf_tar `pwd`/mydirectory > outfile.tar Prepend $(pwd)/ or `pwd`/ if you want to specify an absolute path instead of a relative path. NOTES
This script is meant for use with Berkeley DB based bogofilter versions. This script requires a SUSv2 compliant pax utility. This script expects a SUSv2 compliant shell. Solaris systems should have the SUNWxcu4 package installed (when bogofilter is configured) so that /usr/xpg4/bin/sh can be used. 07/23/2007 BF_TAR(1)
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