RHCE experiment: xinetd-Based Access Control in Linux

 

Requirements: configure the telnet server and use xinetd to implement the following access control functions

1. the maximum number of connections to the telnet server is 20.

2. If the number of telnet requests per second reaches 4, the service will automatically stop for 1 minute.

3. Only hosts from the trust.com domain and 192.168.0.0/24 can access your telnet server.

4. Deny access to your telnet server from hosts 192.168.0.100 and bad.trust.com

5. Allow the above clients to access the telnet server from PM to PM

6. Each client can have up to two telnet connections to the server at the same time.

Lab environment:

1. Windows XP host, IP = 192.168.0.2

2. Redhat Linux5 Vm, IP = 192.168.0.1

[Root @ localhost ~] # Cat/etc/hosts

127.0.0.1 localhost. localdomain localhost

192.168.0.1 ns.trust.com ns

192.168.0.2 bad.trust.com bad

Solution:

[Root @ localhost ~] # Vi/etc/xinetd. d/telnet

Instances = 20

Cps = 4 60

Only_from = 192.168.0.0/24 .trust.com

No_access = 192.168.0.1 bad.trust.com

Access_times = --

Per_source = 2

[Root @ localhost ~] # Service xinetd restart