Paranoid Penguin - Linux Filesystem Security, Part II
Save and exit the file.
Now, to do his thing, crash enters the command:
sudo rm /home/biff/extreme_casseroles/pineapple_mushroom_surprise.txt
whereupon he is prompted to enter his password. After he enters this correctly, the command:
is executed as root, and the offending file is gone.
Alternately, the line in /etc/sudoers could look like this:
crash localhost=/bin/rm /home/biff/extreme_casseroles/*
That way, crash can delete anything in extreme_casseroles/, regardless of the sticky bit setting.
As handy as it is, sudo is a powerful tool, so use it wisely; root privileges never should be trifled with. It really is better to use user and group permissions judiciously than to hand out root privileges, even with sudo. Better still, use an RBAC-based system such as SELinux if the stakes are high enough.
That's it for now. I hope you've found this tutorial useful. Until next time, be safe!
Mick Bauer, CISSP, is Linux Journal's security editor and an IS security consultant in Minneapolis, Minnesota. He's the author of Building Secure Servers With Linux (O'Reilly & Associates, 2002).
|PostgreSQL, the NoSQL Database||Jan 29, 2015|
|HPC Cluster Grant Accepting Applications!||Jan 28, 2015|
|Sharing Admin Privileges for Many Hosts Securely||Jan 28, 2015|
|Red Hat Enterprise Linux 7.1 beta available on IBM Power Platform||Jan 23, 2015|
|Designing with Linux||Jan 22, 2015|
|Wondershaper—QOS in a Pinch||Jan 21, 2015|
- PostgreSQL, the NoSQL Database
- Sharing Admin Privileges for Many Hosts Securely
- HPC Cluster Grant Accepting Applications!
- Internet of Things Blows Away CES, and it May Be Hunting for YOU Next
- Designing with Linux
- Wondershaper—QOS in a Pinch
- Ideal Backups with zbackup
- Red Hat Enterprise Linux 7.1 beta available on IBM Power Platform
- Slow System? iotop Is Your Friend
- January 2015 Issue of Linux Journal: Security
Editorial Advisory Panel
Thank you to our 2014 Editorial Advisors!
- Jeff Parent
- Brad Baillio
- Nick Baronian
- Steve Case
- Chadalavada Kalyana
- Caleb Cullen
- Keir Davis
- Michael Eager
- Nick Faltys
- Dennis Frey
- Philip Jacob
- Jay Kruizenga
- Steve Marquez
- Dave McAllister
- Craig Oda
- Mike Roberts
- Chris Stark
- Patrick Swartz
- David Lynch
- Alicia Gibb
- Thomas Quinlan
- Carson McDonald
- Kristen Shoemaker
- Charnell Luchich
- James Walker
- Victor Gregorio
- Hari Boukis
- Brian Conner
- David Lane