Date: Wed, 2 May 2012 10:27:13 -0659 From: David Thiel <lx@redundancy.redundancy.org> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: freebsd-stable@freebsd.org Subject: Re: Jails can't get routing info Message-ID: <20120502172649.GE66263@redundancy.redundancy.org> In-Reply-To: <597C92B2-02AA-4093-B6A3-B871CCDB70F8@lists.zabbadoz.net> References: <20120501194101.GD66263@redundancy.redundancy.org> <597C92B2-02AA-4093-B6A3-B871CCDB70F8@lists.zabbadoz.net>
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On Tue, May 01, 2012 at 09:01:09PM +0000, Bjoern A. Zeeb wrote: > > So, I've been trying to debug an issue running nmap scans within jails, > > partially documented here: > > > > http://seclists.org/nmap-dev/2012/q2/220 > > > > On further debugging, it's seeming like jails can't read routing > > information directly at all: > > > > # route get 69.163.203.254 > > route: writing to routing socket: No such process > > > > Now, this is normally done via reading the routing table via something like > > socket(PF_ROUTE, SOCK_RAW, AF_INET), so one would suspect that this is a > > problem with raw sockets; but raw sockets are enabled within the jail. > > netstat is able to read routing information just fine, but I don't think > > it's doing it via the socket() call. > > hmm, sure you don't have /dev/mem in the jail? netstat -rn I think is still > using libkvm *sigh* and not the sysctl API. Actually I do - in desperation I put a "add path '*' unhide" in the devfs.rules. Now that I think of it, that is what makes netstat work. But, I still don't understand why "route get" doesn't work, given that the very existence of the "security.jail.socket_unixiproute_only" sysctl implies that by default, you should be able to open routing sockets in a jail (presuming raw sockets are enabled, which they are). > > Anyone know why this behavior might be happening? > > Without thinking too much (as in if I got the right case) I think you are > hitting this one: > > http://svnweb.freebsd.org/base/head/sys/net/rtsock.c?annotate=234572#l792 Hmm, that seems to relate to pulling via sysctl, which the "route" command doesn't do. It sounds useful for fixing netstat, though. Thanks, Davidhome | help
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