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I installed wireshark (tshark) using

sudo apt-get install tshark

this installed the tshark executable in /usr/bin/tshark.

The problem now is that I am unable to run it without root permissions. How can I execute this command using the permissions of a normal user?

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migrated from stackoverflow.com Dec 10 '09 at 6:26

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3 Answers 3

The Wireshark wiki discusses permissions and ways to "circumvent" them if needed - although I'm pretty sure that any packet capturing on Linux would require root at some level.

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I had a similar issue with not being able to see any network interfaces when running Wireshark (tshark's GUI cousin) as a non-root user. Nowadays, Ubuntu and Debian support file capabilities with which I was able to get Wireshark (and tshark) running as non-root.

First, create a wireshark group

:~$ sudo groupadd wireshark

Second, add your username to the wireshark group

:~$ sudo usermod -a -G wireshark yourusername

Third, change group ownership of dumpcap to wireshark group

:~$ sudo chgrp wireshark /usr/bin/dumpcap

Fourth, set file permissions of dumpcap to 754 (rwx for user, r-x for group)

:~$ sudo chmod 754 /usr/bin/dumpcap

Fifth, enable file capabilities for dumpcap

:~$ sudo setcap 'CAP_NET_RAW+eip CAP_NET_ADMIN+eip' /usr/bin/dumpcap

You may also need to run dpkg-reconfigure for wireshark-common if you install wireshark or tshark as a package through Synaptic and enable packet capture for non-root users

:~$ sudo dpkg-reconfigure wireshark-common
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refer to the great wireshark wiki regarding capture privileges. Look at the section titled, "Limiting capture permission to only one group"... –  Jun_in_Jeju Jul 3 '12 at 13:03

It will probably need root credential to put the network card into premiscious mode. You need to set the user id http://www.zzee.com/solutions/linux-permissions.shtml#setuid or run it with sudo. Sudo is the better, more secure, option.

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