Messages in this thread | | | From | Török Edwin <> | Subject | Re: [PATCH 2.6.15.4 1/1][RFC] ipt_owner: inode match supporting both incoming and outgoing packets | Date | Sat, 18 Feb 2006 22:03:41 +0200 |
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On Saturday 18 February 2006 21:28, Patrick McHardy wrote: > Török Edwin wrote: > > First of all this is what I'd like to achieve: > > - filter packets by the program who sent the packet > > - filter packets by the program who is going to receive the packet > > - when multiple programs share a socket (i.e. they listen on the same > > socket), allow the packet only if all programs are allowed to receive the > > packet > > Besides the tasklist_lock issues, there is no 1:1 relationship between > sockets and processes, which is why this can never work. You don't know > which process is going to receive a packet until it calls recvmsg(). Can sockets be "labeled". Like creating a label for each process, and then apply a label to each socket they open. If a socket gets shared, then it gets multiple labels. I see that you talk about SELinux labels below, but is there a way to "label" anything without using SELinux? (Maybe by writing another LSM module that does just this socket labeling?) I could then just check the labels to see if a packet is allowed to pass/ or not. > > There is some work in progress to solve this problem in a different way, > by adding new hooks to the protocols that get the socket as context, > and using SElinux labels instead of process names/inodes/whatever for > matching. Could you tell me on which thread/mailing list this discussion/(work in progress) is taking place? I'd like to follow it.
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