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Full Discussion: Need to create a restricted user(Centos)
Top Forums UNIX for Dummies Questions & Answers Need to create a restricted user(Centos) Post 302351476 by ankushpandit on Tuesday 8th of September 2009 04:22:34 PM
Old 09-08-2009
Data Need to create a restricted user(Centos)
Hi,
I am a newbie to Linux and I want to create a user which can only execute network config commands like ifconfig and ping(to check the config). The following is what I did but failed.
1) Created a group called 'netconfig'.
2) added a user named 'user'.
3) added user to the 'netconfig' group.
4) Changed the permissions on /bin and /sbin directories so that only groups 'root' and 'netconfig' can Read & execute.
The Result
1) I can execute ping and ifconfig commands when I log on as 'root' and can configure the network(as Default ofcourse).
2) The problem arises when I execute this command and get the following response.
[A]
/bin/ping x.x.x.x [enter]
ping: icmp open socket: Operation not permitted
[B]
/sbin/ifconfig [enter]
eth0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
inet addr:x.x.x.x Bcast:x.x.x.255 Mask:255.255.255.0
inet6 addr: aaaa::aaaa:aaaa:aaaa:9999/00 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1320 errors:0 dropped:0 overruns:0 frame:0
TX packets:991 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:138423 (135.1 KiB) TX bytes:178569 (174.3 KiB)
Memory:d0200000-d0220000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2343 errors:0 dropped:0 overruns:0 frame:0
TX packets:2343 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2709476 (2.5 MiB) TX bytes:2709476 (2.5 MiB)
[this seems to work fine till I dont execute the following line]
[C]
/sbin/ifconfig eth0 down [enter]
SIOCSIFFLAGS: Permission denied
I have 2 questions
a} Am I at a right path for my goal, i.e. Am I doing right steps for creating a user which has only access to 'ifconfig' and 'ping' command?
b} Is there a better way for creating a restricted user with access to only 2 commands?
Please help with this. Any examples and experiences are welcome.
Thanks in advance,
Ankush Pandit.


ps: Sorry I forgot to mention I am using CentOS 5.2 and I also tried jailkit but failed Smilie
 

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LEARN ABOUT PHP

inet_type

inet_type(4)							   File Formats 						      inet_type(4)

NAME

       inet_type - default Internet protocol type

SYNOPSIS

       /etc/default/inet_type

DESCRIPTION

       The inet_type file defines the default IP protocol to use. Currently this file is only used by the ifconfig(1M) and netstat(1M) commands.

       The  inet_type  file  can  contain  a  number of <variable>=<value> lines. Currently, the only variable defined is DEFAULT_IP, which can be
       assigned a value of IP_VERSION4, IP_VERSION6, or BOTH.

       The output displayed by the ifconfig and netstat commands can be controlled by the value of DEFAULT_IP set in inet_type file.  By  default,
       both commands display the IPv4 and IPv6 information available on the system. The user can choose to suppress display of IPv6 information by
       setting the value of DEFAULT_IP.  The following shows the possible values for DEFAULT_IP and the resulting ifconfig and netstat output that
       will be displayed:

       IP_VERSION4     Displays only IPv4 related information. The output displayed is backward compatible with older versions of the ifconfig(1M)
		       and netstat(1M) commands.

       IP_VERSION6     Displays both IPv4 and IPv6 related information for ifconfig and netstat.

       BOTH	       Displays both IPv4 and IPv6 related information for ifconfig and netstat.

       The command-line options to the ifconfig and netstat commands override the effect of DEFAULT_IP as set in the inet_type file. For  example,
       even if the value of DEFAULT_IP is IP_VERSION4, the command

       example% ifconfig -a6

       will display all IPv6 interfaces.

EXAMPLES

       Example 1: Suppressing IPv6 Related Output

       This is what the inet_type file must contain if you want to suppress IPv6 related output:

       DEFAULT_IP=IP_VERSION4

SEE ALSO

       ifconfig(1M), netstat(1M)

SunOS 5.10							    16 Jun 1999 						      inet_type(4)
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