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Britto I [britto_can at yahoo.com]
Folks
For some reason i want one my service should use the port < 1024
It says access denied for the users other than root. Can we have any workaround for this
-- Britto
Joey Prestia [joey at linuxamd.com]
Britto I wrote:
> Folks > > For some reason i want one my service should use the port < 1024 > > It says access denied for the users other than root. Can we have any > workaround for this > > -- > Britto >
Britto,
Can you be more descriptive in your question? Try giving us information on what service your referring to what distro (Red Hat, Debian, Slackware) what version of the software your running. Did you do a package install or build the software from source? Stuff like that is very important for the people to know if you want help. Give as many details as you can possibly provide. The people on this list are very knowledgeable and can help but not if you don't help them by telling more about what the specifics are in regards to your problem.
Best,
-- Joey Prestia L. G. Mirror Coordinator http://linuxamd.com Main Site http://linuxgazette.net
Thomas Adam [thomas.adam22 at gmail.com]
Hi --
2008/9/10 Britto I <britto_can@yahoo.com>:
> Folks > > For some reason i want one my service should use the port < 1024
Right -- so configure your warez^H^H^Hservice to listen on this port then.
> It says access denied for the users other than root. Can we have any > workaround for this
Nope, since you've provided absolutely no information on what the service is.
-- Thomas Adam
Britto I [britto_can at yahoo.com]
Thanks Thomas and Joey.
The Operating system what i am using is Centos 5.2
We have our own java based software which is configured to use the port < 1024 for some testing.when i try to start running my process
I see the java exception which says ":: java.net.BindException: Permission denied"
As a root i could start and use without any issue
-- br
Jim Jackson [jj at franjam.org.uk]
On Wed, 10 Sep 2008, Britto I wrote:
> Thanks Thomas and Joey. > > The Operating system what i am using is Centos 5.2 > > We have our own java based software which is configured to use the port < > 1024 for some testing.when i try to start running my process > > I see the java exception which says ":: java.net.BindException: > Permission denied" > > As a root i could start and use without any issue
It is a common "security" feature to only allow root to use ports < 1024
There are a couple of solutions. Use an internet service launcher, like
inetd or xinetd, to listen on the port and launch your application. I think
xinetd can launch your application to run as a non-root user. However you'd
have to alter you appl. to use stdin and stdout files instead of handling
the sockets directly (actually this makes creating an itnernet application
trivial - you don't need to understand sockets 
Alternatively make your application setuid root (see man chmod), so that when it is executed it starts as root, so it can listen on the priveleged port, then it can make a system call to stop being root and alter to a normal user - the C lib function is setuid.
I'm sure you could do a google code search for some example code.
cheers Jim
Ben Okopnik [ben at linuxgazette.net]
On Wed, Sep 10, 2008 at 07:12:53AM -0700, Britto I wrote:
> Folks > > For some reason i want one my service should use the port < 1024 > > It says access denied for the users other than root. Can we have any > workaround for this
Maybe. Depends on what you're doing. You could, for example, start a server on a low port as root and then drop the privileges of the server process - this is a common (and smart, if done right) tactic.
-- * Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET *