On Thu, Sep 01 2016 at 46:18, Vincent Gross wrote:
> On Thu, 1 Sep 2016 18:02:14 +0200
> Claer <[email protected]> wrote:
>
> > Hello,
> >
> > In some production systems, I'm still using an old patch to isakmpd for
> > Nat-t. When negociating SAs with ASA peers and OpenBSD is nated, you have
> > issues during negociation. The following discutions explain the issue
> >
> > http://openbsd.7691.n7.nabble.com/isakmpd-NAT-T-interoperability-td173004.html
> > http://marc.info/?l=openbsd-tech&m=139140140105433&w=2
> >
> > I think the patch is related to the parts of the code you are working on.
> >
>
> Actually it is not. The issue you are referencing is in isakmpd,
> whereas the diff below is in the OpenBSD kernel. Totally different
> stuff. I do not plan to look at isakmpd at the moment, as it only
> supports IKEv1, and its code is nearly twice the size of iked.
>
> I do not have Cisco gear available to test, is this issue present when
> opening NAT-T tunnels with iked ?
Sorry I overlooked your diff. Unfortunately I didn't have the opportunity
to test with an ASA and iked. I don't have any ASA on hand (usually they are
on the client's side :))
> Cheers
Thanks for your time!
Claer
> > Would you mind looking at this issue also? :)
> >
> > Thanks!
> >
> > Claer
> >
> > On Thu, Sep 01 2016 at 31:10, Vincent Gross wrote:
> >
> > > Our IPSec stack rejects UDP-encapsulated traffic using a non
> > > encapsulating SA, but not the other way around. This diff adds
> > > the missing check and the corresponding stat counter.
> > >
> > > Ok ?
> > >
> > > Index: sys/netinet/ip_esp.h
> > > ===================================================================
> > > RCS file: /cvs/src/sys/netinet/ip_esp.h,v
> > > retrieving revision 1.42
> > > diff -u -p -r1.42 ip_esp.h
> > > --- sys/netinet/ip_esp.h 10 Jan 2010 12:43:07 -0000
> > > 1.42 +++ sys/netinet/ip_esp.h 1 Sep 2016 08:24:15 -0000
> > > @@ -62,6 +62,7 @@ struct espstat
> > > u_int32_t esps_udpencin; /* Input ESP-in-UDP packets */
> > > u_int32_t esps_udpencout; /* Output ESP-in-UDP packets
> > > */ u_int32_t esps_udpinval; /* Invalid input ESP-in-UDP
> > > packets */
> > > + u_int32_t esps_udpneeded; /* Trying to use a ESP-in-UDP
> > > TDB */ };
> > >
> > > /*
> > > Index: sys/netinet/ipsec_input.c
> > > ===================================================================
> > > RCS file: /cvs/src/sys/netinet/ipsec_input.c,v
> > > retrieving revision 1.135
> > > diff -u -p -r1.135 ipsec_input.c
> > > --- sys/netinet/ipsec_input.c 10 Sep 2015 17:52:05
> > > -0000 1.135 +++ sys/netinet/ipsec_input.c 1 Sep 2016
> > > 08:24:16 -0000 @@ -262,6 +262,16 @@ ipsec_common_input(struct mbuf
> > > *m, int s return EINVAL;
> > > }
> > >
> > > + if (!udpencap && (tdbp->tdb_flags & TDBF_UDPENCAP)) {
> > > + splx(s);
> > > + DPRINTF(("ipsec_common_input(): attempted to use
> > > udpencap "
> > > + "SA %s/%08x/%u\n", ipsp_address(&dst_address,
> > > buf,
> > > + sizeof(buf)), ntohl(spi), tdbp->tdb_sproto));
> > > + m_freem(m);
> > > + espstat.esps_udpneeded++;
> > > + return EINVAL;
> > > + }
> > > +
> > > if (tdbp->tdb_xform == NULL) {
> > > splx(s);
> > > DPRINTF(("ipsec_common_input(): attempted to use
> > > uninitialized " Index: usr.bin/netstat/inet.c
> > > ===================================================================
> > > RCS file: /cvs/src/usr.bin/netstat/inet.c,v
> > > retrieving revision 1.150
> > > diff -u -p -r1.150 inet.c
> > > --- usr.bin/netstat/inet.c 27 Aug 2016 04:13:43 -0000
> > > 1.150 +++ usr.bin/netstat/inet.c 1 Sep 2016 08:24:16 -0000
> > > @@ -1073,6 +1073,7 @@ esp_stats(char *name)
> > > p(esps_udpencin, "\t%u input UDP encapsulated ESP
> > > packet%s\n"); p(esps_udpencout, "\t%u output UDP encapsulated ESP
> > > packet%s\n"); p(esps_udpinval, "\t%u UDP packet%s for
> > > non-encapsulating TDB received\n");
> > > + p(esps_udpneeded, "\t%u raw ESP packet%s for encapsulating
> > > TDB received\n"); p(esps_ibytes, "\t%llu input byte%s\n");
> > > p(esps_obytes, "\t%llu output byte%s\n");
> > >
> > >
>
