Re: [Vserver] vserver traceroute

From: Nikolay Kichukov <hijacker_at_oldum.net>
Date: Sun 30 Apr 2006 - 12:53:20 BST
Message-Id: <1146398000.2827.8.camel@ccja.localhost>

Hello Herbert,
I see now. So traceroute cannot be used within a guest environment. I
will try tracepath instead.

One more thing I'd like to comment on is that, every time I issue:

vattribute --set --xid <id> --ccap raw_icmp

on the host, I am getting the following error on the guest when I try to
ssh to it:

fatal: chroot("/var/run/sshd"): Operation not permitted

The only way I go around that is to reboot the guest.

What am I doing wrong when I am setting the --ccap ? Do I reset some
default ccaps or bcaps ? I only have the ccapabilities file and it only
contain raw_icmp. So is the default startup of a vserver initializing
some extra flags/capabilities that are not necessarily predefined
withing flags/ccapabilities/bcapabilities?

Regards,
-Nikolay Kichukov

On Sat, 2006-04-29 at 19:28 +0200, Herbert Poetzl wrote:
> On Fri, Apr 28, 2006 at 10:47:25PM +0300, Nikolay Kichukov wrote:
> > Hello Herbert,
> > Sorry for the long delay in replying again.
> >
> > Here is some further info about the traceroute tool I am
> > using on the GUEST:
>
> ah, obviously confused that because I do not use
> traceroute myself, just verified that traceroute
> tries to open an unlimited raw socket:
>
> socket(PF_INET, SOCK_RAW, IPPROTO_ICMP) = 6
> socket(PF_INET, SOCK_RAW, IPPROTO_RAW) = -1 EPERM (Operation not permitted)
>
> which of course is not permitted inside a guest,
> as it would allow to sniff and spoof arbitrary
> traffic on a guest ...
>
> OTOH, the following works quite fine:
>
> # tracepath 10.0.0.1
> 1: xxxx.test.org (192.168.0.2) 9.773ms pmtu 1500
> 1: 10.0.0.1 (10.0.0.1) 5.306ms reached
> Resume: pmtu 1500 hops 1 back 1
>
> HTH,
> Herbert
>
> > root@vn:/usr/bin# dpkg --status traceroute
> > Package: traceroute
> > Status: install ok installed
> > Priority: important
> > Section: net
> > Installed-Size: 60
> > Maintainer: Graham Wilson <graham@debian.org>
> > Architecture: i386
> > Version: 1.4a12-20
> > Replaces: netstd
> > Depends: libc6 (>= 2.3.5-1)
> > Conflicts: suidmanager (<< 0.50)
> > Description: traces the route taken by packets over a TCP/IP network
> > The traceroute utility displays the route used by IP packets on their way
> > to a
> > specified network (or Internet) host. Traceroute displays the IP number
> > and
> > host name (if possible) of the machines along the route taken by the
> > packets.
> > Traceroute is used as a network debugging tool. If you're having network
> > connectivity problems, traceroute will show you where the trouble is coming
> > from along the route.
> > .
> > Install traceroute if you need a tool for diagnosing network connectivity
> > problems.
> > root@vn:/usr/bin#
> >
> >
> > root@vn:/usr/bin# ls -alh traceroute
> > lrwxrwxrwx 1 root root 28 Mar 17 00:38 traceroute ->
> > /etc/alternatives/traceroute
> >
> >
> > root@vn:/usr/bin# ls -alh /etc/alternatives/traceroute
> > lrwxrwxrwx 1 root root 23 Mar 17 00:38 /etc/alternatives/traceroute ->
> > /usr/bin/traceroute.lbl
> >
> >
> > root@vn:/usr/bin# ls -alh traceroute.lbl
> > -rwsr-xr-x 1 root root 18K Aug 30 2005 traceroute.lbl
> >
> >
> > and again that same error message:
> >
> > root@vn:/usr/bin# traceroute linux-vserver.org
> > traceroute: raw socket: Operation not permitted
> >
> >
> > I do have the raw_icmp ccapability enabled.
> >
> >
> > Further information:
> >
> > root@nevir:~# vserver-info
> > Versions:
> > Kernel: 2.6.14.4-vs2.1.0nevir
> > VS-API: 0x00020001
> > util-vserver: 0.30.209; Jan 8 2006, 12:24:41
> >
> > Features:
> > CC: gcc, gcc (GCC) 4.0.3 20051201 (prerelease)
> > (Debian 4.0.2-5)
> > CXX: g++, g++ (GCC) 4.0.3 20051201 (prerelease)
> > (Debian 4.0.2-5)
> > CPPFLAGS: ''
> > CFLAGS:
> > '-Wall -g -O2 -std=c99 -Wall -pedantic -W -funit-at-a-time'
> > CXXFLAGS:
> > '-g -O2 -ansi -Wall -pedantic -W -fmessage-length=0 -funit-at-a-time'
> > build/host: i486-pc-linux-gnu/i486-pc-linux-gnu
> > Use dietlibc: yes
> > Build C++ programs: yes
> > Build C99 programs: yes
> > Available APIs: compat,v11,v13,fscompat,net,oldproc,olduts
> > ext2fs Source: e2fsprogs
> > syscall(2) invocation: alternative
> > vserver(2) syscall#: 273/glibc
> >
> > Paths:
> > prefix: /usr
> > sysconf-Directory: /etc
> > cfg-Directory: /etc/vservers
> > initrd-Directory: $(sysconfdir)/init.d
> > pkgstate-Directory: /var/run/vservers
> > vserver-Rootdir: /var/lib/vservers
> >
> >
> > Assumed 'SYSINFO' as no other option given; try '--help' for more
> > information.
> >
> >
> > root@nevir:~# uname -a
> > Linux nevir 2.6.14.4-vs2.1.0nevir #4 Thu Mar 16 19:43:43 EET 2006 i686
> > GNU/Linux
> >
> >
> > Let me know if you need any more information to troubleshoot that matter.
> >
> > Thanks,
> > -Nikolay Kichukov
> >
> > ----- Original Message -----
> > From: "Herbert Poetzl" <herbert@13thfloor.at>
> > To: "Nikolay Kichukov" <hijacker@oldum.net>
> > Cc: <vserver@list.linux-vserver.org>
> > Sent: Friday, April 21, 2006 8:08 PM
> > Subject: Re: [Vserver] vserver traceroute
> >
> >
> > > On Fri, Apr 21, 2006 at 05:30:53PM +0300, Nikolay Kichukov wrote:
> > > > hi, the version is:
> > > >
> > > > util-vserver 0.30.209-2
> > > >
> > > > Would you suggest an upgrade to get the traceroute going? It is not so
> > > > important to make traceroute working. It is the idea that stays behind
> > > > that. ;-) To have the guest at full operational power as if it is a
> > > > real machine.
> > >
> > > can you provide a static binary of that traceroute tool
> > > for testing? it is supposed to work with ram_icmp
> > > capability enabled ...
> > >
> > > TIA,
> > > Herbert
> > >
> > > >
> > > > Thanks and regards,
> > > > -Nikolay Kichukov
> > > >
> > > >
> > > > ----- Original Message -----
> > > > From: "Herbert Poetzl" <herbert@13thfloor.at>
> > > > To: "Nikolay Kichukov" <hijacker@oldum.net>
> > > > Cc: <vserver@list.linux-vserver.org>
> > > > Sent: Thursday, April 20, 2006 9:43 PM
> > > > Subject: Re: [Vserver] vserver traceroute
> > > >
> > > >
> > > > > On Thu, Apr 20, 2006 at 05:24:00PM +0300, Nikolay Kichukov wrote:
> > > > > > hello,
> > > > > > even trying to traceroute -I is still giving that same error
> > message.
> > > > > > What could be wrong? Do I need to set some extra ccapabilities?
> > > > > >
> > > > > > Also, what does the --secure option of the vattribute do ?
> > > > >
> > > > > that really depends on the tool version, which
> > > > > one do you have?
> > > > >
> > > > > usually it removes most capabilites from the guest
> > > > >
> > > > > best,
> > > > > Herbert
> > > > >
> > > > > >
> > > > > > Regards,
> > > > > > -Nikolay Kichukov
> > > > > >
> > > > > > ----- Original Message -----
> > > > > > From: "Xavier Montagutelli" <xavier.montagutelli@unilim.fr>
> > > > > > To: <vserver@list.linux-vserver.org>
> > > > > > Sent: Thursday, April 20, 2006 3:33 PM
> > > > > > Subject: Re: [Vserver] vserver traceroute
> > > > > >
> > > > > >
> > > > > > > On Thursday 20 April 2006 13:29, Nikolay Kichukov wrote:
> > > > > > > > Hello guys,
> > > > > > > > Thanks for the advice, and sorry for taking me so long to
> > respond.
> > > > > > > >
> > > > > > > > I tried setting:
> > > > > > > >
> > > > > > > > host# vattribute --set --xid <xid> --secure --ccap raw_icmp
> > > > > > > >
> > > > > > > > and when i try to traceroute a host I am again getting:
> > > > > > > >
> > > > > > > > traceroute: raw socket: Operation not permitted
> > > > > > >
> > > > > > > On my debian box, traceroute use by default UDP packets, not ICMP
> > > > packets.
> > > > > > >
> > > > > > > Try "-I icmp" to use icmp.
> > > > > > >
> > > > > > > >
> > > > > > > > Any further ideas?
> > > > > > > >
> > > > > > > > Another problem has now appeared:
> > > > > > > > When i try to ssh to the guest sshd, i am getting the following
> > > > error:
> > > > > > > >
> > > > > > > > fatal: chroot("/var/run/sshd"): Operation not permitted
> > > > > > > >
> > > > > > > > /var/run/sshd is rwx for root and r-x for the group and others
> > > > > > > >
> > > > > > > > Any ideas?
> > > > > > > >
> > > > > > > > Additional info:
> > > > > > > >
> > > > > > > > util-vserver 0.30.209-2 debian package
> > > > > > > > kernel 1.6.14.4-vs2.1.0
> > > > > > > >
> > > > > > > > On Tue, 2006-04-11 at 13:17 +0200, Daniel Hokka Zakrisson wrote:
> > > > > > > > > Nikolay Kichukov wrote:
> > > > > > > > > > Hi,
> > > > > > > > > > Thanks for the advise,
> > > > > > > > > > I'd like to test that and I already have raw_icmp in the
> > flags
> > > > file
> > > > > > for
> > > > > > > > > > the vserver, but is there a way i can set that without
> > rebooting
> > > > the
> > > > > > > > > > vserver?
> > > > > > > > >
> > > > > > > > > It's a context capability, so you should put it in
> > ccapabilities
> > > > file.
> > > > > > > > >
> > > > > > > > > > I've searched for information about chcontext and did not
> > find a
> > > > lot
> > > > > > > > > > about setting those caps and flags dynamically. Is that
> > > > possible? If
> > > > > > > > > > yes, how?
> > > > > > > > >
> > > > > > > > > vattribute --set --xid <name or xid of the
> > guest> --secure --ccap
> > > > > > > > > raw_icmp (add additional --bcaps here if you have any, as
> > they'll
> > > > be
> > > > > > > > > reset otherwise)
> > > > > > > > >
> > > > > > > > > > Also, another question is, i have already created(built) the
> > > > vserver
> > > > > > > > > > without --context NNN, and now I would like to get the
> > vserver
> > > > > > running
> > > > > > > > > > only in a specified context, ie. 444. How can i implement
> > that?
> > > > > > > > >
> > > > > > > > > echo NNN > /etc/vservers/<name>/context
> > > > > > > > >
> > > > > > > > > http://www.nongnu.org/util-vserver/doc/conf/configuration.html
> > > > > > > >
> > > > > > > > _______________________________________________
> > > > > > > > Vserver mailing list
> > > > > > > > Vserver@list.linux-vserver.org
> > > > > > > > http://list.linux-vserver.org/mailman/listinfo/vserver
> > > > > > >
> > > > > > > --
> > > > > > > Xavier Montagutelli Tel : +33 (0)5 55 45 77
> > 20
> > > > > > > Service Commun Informatique Fax : +33 (0)5 55 45 77
> > 60
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> > > > > > > 123, avenue Albert Thomas
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> > > > > > >
> > > > > >
> > > > > > _______________________________________________
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