Tools that will display group and user permissions on a set of folder:
– Suramya
May 11, 2005
May 8, 2005
Monitor Per protocol/port bandwidth usage
These programs will generate a per protocol/port bandwidth usage information on a given server:
– Suramya
May 7, 2005
How to log shell sessions?
Use a program called script, it makes a typescript of terminal session, meaning it logs everything printed on your terminal. Use `man script` to get more information about it.
– Suramya
How to see which programs are opening ports
These tools will help you identify which programs are opening what ports on the system.
1. lsof | grep ‘IPv.’
lsof shows the list of open files, piping it through grep and searching for IPv will give you a list of ports used by a program
lsof -i TCP:<PORT>
where PORT is the one you need to know about the program behind it.
2. netstat -anp
Should display open ports, machines connected to the ports as well as which application has that port open.
If you know of any other ways let me know.
– Suramya
May 5, 2005
The Coroner Toolkit
Linux Magazine has a really good article on The Coroner Tool kit which allows a sysadmin to perform forensics analysis on a compromized system.
Article: Linux Magazine
The Coroner Toolkit: Download Page
– Suramya
April 28, 2005
Forum on computer security
Cool forum that touches on every aspect of computer security:
April 27, 2005
Detecting suspicious network traffic with psad
These are light weight tools that alert you to suspicious network activity by analyzing iptables log files. This article contains information on how to install and configure psad.
– Suramya
April 24, 2005
Allow non administrators to run Autocad etc
Some applications like autocad require the current user to be logged in as an administrator in order to use them and as you can imagine thats not a good idea. Esp if this makes you give admin access to users who are likely to install random software and otherwise mess up a perfectly good system.
To avoid this situation follow the following instructions by Anomic Anomaly posted on the Security Basics mailing list:
1. Grab ‘FileMon’ and ‘RegMon’ (both free) from SysInternals
2. Run AutoCad and monitor the changes made to the filesystem and registry.
3. Modify permissions only on those specific areas and give the user access to them
4. Watch your users happily run AutoCad as a User.
– Suramya
April 22, 2005
Setting up encrypted tunnels
Sometimes its desireable to setup an encrypted tunnel between two networked computers so that you can transfer data between them without letting anyone snoop the traffic.
The following are some of the programs that enable you to setup secure tunnels:
Cryptcat is the standard netcat enhanced with twofish encryption.
Stunnel is a program that allows you to encrypt arbitrary TCP connections inside SSL. It allows you to secure non-SSL aware daemons and protocols (like POP, IMAP, LDAP, etc) by having Stunnel provide the encryption, requiring no changes to the daemon’s code.
Zebedee is a simple program to establish an encrypted, compressed â??tunnelâ?? for TCP/IP or UDP data transfer between two systems.
SSH allows you to redirect local and remote ports over a secure SSH connection. The main advantage of this is that no extra software needs to be installed on the systems in order to use it.
In you know of others let me know and I will add them.
– Suramya
April 21, 2005
How to map network
If you ever had to find all of the IP’s of the routers and computers on a network then these programs are for you. I havn’t tried them myself yet but they look promising. (The descriptions are taken verbatin from their respective websites)
Angry IP scanner is a very fast IP scanner for Windows. It can scan IPs in any range. Its binary file size is very small compared to other IP scanners. Angry IP scanner simply pings each IP address to check if it’s alive, then optionally it is resolving hostname, scans ports, etc.
A powerful connect-based TCP port scanner, pinger and hostname resolver. Multithreaded and asynchronous techniques make this program extremely fast and versatile. Perform ping scans and port scans using any IP range or specify a text file to extract addresses from.
Cheops is an Open Source Network User Interface. It is designed to be the network equivalent of a swiss-army knife, unifying your network utilities.
As usual if you know of any others let me know.
– Suramya