On Thu, Sep 8, 2022 at 4:15 PM Ted Toth <txtoth@xxxxxxxxx> wrote: > > On Thu, Sep 8, 2022 at 8:43 AM Ted Toth <txtoth@xxxxxxxxx> wrote: > > > > On Wed, Sep 7, 2022 at 5:48 PM Paul Moore <paul@xxxxxxxxxxxxxx> wrote: > > > > > > On Wed, Sep 7, 2022 at 4:56 PM Dominick Grift > > > <dominick.grift@xxxxxxxxxxx> wrote: > > > > Ted Toth <txtoth@xxxxxxxxx> writes: > > > > > systemd uses a helper process (sd-listen) to create sockets and pass > > > > > their fds back to its parent. I've patched systemd to call semanage to > > > > > get the context for the port if it exists and create a context using > > > > > the returned type when calling setsockcreatecon. Everything looks > > > > > right i.e. the port type is retrieved, the context is created and > > > > > setsockcreatecon is called without errors. However 'netstat -Z' shows > > > > > the listening sockets type as init_t and not the type in the > > > > > setsockcreatecon call, is this the expected behavior? Can anyone help > > > > > me understand why this is happening? > > > > > > > > It is probably the context of the process listening on the port and not > > > > the context of the socket that binds to the port > > > > > > That's a good point, I would have thought it would have looked at the > > > socket itself but perhaps it is the calling process' label. Actually, > > > it might be the fd's label associated with the socket; that would > > > explain it. Someone would need to look at the netstat sources to > > > confirm. > > > > Is there an API to query the context of a socket fd? > > I wrote a client which connects and calls getpeercon and indeed the > context is what was set via setsockcreatecon so that's reassuring. > Unfortunately it seems that netstat, ss and lsof don't have a way to > query the context of the listening socket :( I'd like to see a > getsockcon function (taking an fd as its argument) added to libselinux > if it can be written. There is a way to see a socket's context, though it's a bit obscure: ls -ZL /proc/<PID>/fd/<FD> -- Ondrej Mosnacek Senior Software Engineer, Linux Security - SELinux kernel Red Hat, Inc.
