[lkml]   [2003]   [Dec]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: allow process or user to listen on priviledged ports?
    On Wed, Dec 24, 2003 at 05:43:09PM +0100, Sven K?hler wrote:
    > my problem is, that i want an application to listen on a priviledged
    > port (e.g. port 80) and to run as a "normal" unpriviledged user

    I would give your application this capability (from #include "linux/capability.h")

    /* Allows binding to TCP/UDP sockets below 1024 */
    /* Allows binding to ATM VCIs below 32 */

    #define CAP_NET_BIND_SERVICE 10

    You do this with a setuid wrapper which drops all capabilities but
    that one and then runs your application.

    One day there will be a way of doing this in the filing system, so
    instead of doing a chmod u+s you do a chmod +CAP_NET_BIND_SERVICE or
    something! Until then use a setuid wrapper....

    Here is a FAQ

    Actually the FAQ mentions sucap which seems to be a fairly standard
    program (its in Debian anyway!). You could use this too...

    Nick Craig-Wood
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 13:59    [W:0.025 / U:3.120 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site