Audisp-remote - connection refused.
Rituraj Buddhisagar
rituraj at vayana.com
Tue Oct 3 18:40:02 UTC 2017
Hi Steve / Audit List ;
I have this issue because Ubuntu has disabled support for listener in their
distribution !!
On a blog I found that Debian has not disabled it but the Ubuntu
distribution has.
I found this when I ran auditd in foreground with -f option.
Listener support is not enabled, ignoring value at line 25
tcp_listen_queue_parser called with: 5
Listener support is not enabled, ignoring value at line 26
tcp_max_per_addr_parser called with: 1
Listener support is not enabled, ignoring value at line 27
tcp_listen_queue_parser called with: 1024-65535
Listener support is not enabled, ignoring value at line 28
tcp_client_max_idle_parser called with: 0
Steve, I then went to source site ( https://people.redhat.com/sgrubb/audit/
) and downloaded a zip from there.
I am doing a install using below config command : it fails with
python-packages dependency.
./configure --prefix=/usr/local --sbindir=/usr/local/sbin --with-python=yes
--with-libwrap --enable-gssapi-krb5=yes --with-libcap-ng=yes
............
.............
.............
checking for python platform... linux2
checking for python script directory...
${prefix}/lib/python2.7/dist-packages
checking for python extension module directory...
${exec_prefix}/lib/python2.7/dist-packages
configure: error: Python explicitly requested and python headers were not
found
root at guslogs:/usr/src/audit-2.7.8#
Please can you tell me which dependent packages I need to download and
configure apart from python? (with a source link would help).
I see on the site that you have included - "Improved Remote Logging" in the
Roadmap :) Appreciate it and anticipating it !
In the meanwhile I am also thinking of requesting Ubuntu for adding this
support - not sure why they did this, what is their logic behind this. I
hereby request if you can do something from your end to discuss with Ubuntu
maintenars to enable this - as there is a HUGE Linux support base out there
using that distro.
Thanks!
Best Regards,
Rituraj B
On Tue, Oct 3, 2017 at 8:38 PM, Steve Grubb <sgrubb at redhat.com> wrote:
> On Tuesday, October 3, 2017 8:52:48 AM EDT Rituraj Buddhisagar wrote:
> > Hi Steve,
> >
> > I did check IPtables and I am not having any rules in there. I have
> allowed
> > the connections in /etc/hosts.allow. But then I do not see auditd
> listening
> > on port 60.
> > It just shows "ESSTABLISHED" connection on the aggregating server - which
> > is itself!
>
> You should not enable audisp-remote on the aggregating server. Auditd
> handles
> incoming connections itself.
>
> -Steve
>
> > root at guslogs:/etc/audit# lsof -i :60
> > COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
> > audisp-re 2146 root 3u IPv4 20368 0t0 TCP 192.168.103.7:60->
> > 192.168.103.7:60 (ESTABLISHED)
> > root at guslogs:/etc/audit#
> > root at guslogs:/etc/audit# netstat -pan | grep 60
> > tcp 0 0 0.0.0.0:22 0.0.0.0:*
> LISTEN
> > 1260/sshd
> > tcp 10491 1360 192.168.103.7:60 192.168.103.7:60
> > ESTABLISHED 2146/audisp-remote
> > tcp6 0 0 :::22 :::*
> LISTEN
> > 1260/sshd
> > unix 2 [ ACC ] STREAM LISTENING 16055 1925/0
> > /tmp/ssh-h0brbTMA4a/agent.1925
> > unix 3 [ ] STREAM CONNECTED 13777 1260/sshd
> >
> > unix 2 [ ] DGRAM 17760 1897/systemd
> >
> > unix 3 [ ] STREAM CONNECTED 16036 1897/systemd
> >
> > unix 2 [ ] DGRAM 20360 2136/auditd
> >
> > unix 3 [ ] STREAM CONNECTED 13260 1/init
> > /run/systemd/journal/stdout
> > root at guslogs:/etc/audit#
> > root at guslogs:/etc/audit# netstat -tanp | grep auditd
> > root at guslogs:/etc/audit#
> > root at guslogs:/etc/audit# iptables -L
> > Chain INPUT (policy ACCEPT)
> > target prot opt source destination
> >
> > Chain FORWARD (policy ACCEPT)
> > target prot opt source destination
> >
> > Chain OUTPUT (policy ACCEPT)
> > target prot opt source destination
> > root at guslogs:/etc/audit#
> > root at guslogs:/etc/audit# cat /etc/hosts.allow
> > # /etc/hosts.allow: list of hosts that are allowed to access the system.
> > # See the manual pages hosts_access(5) and
> > hosts_options(5).
> > #
> > # Example: ALL: LOCAL @some_netgroup
> > # ALL: .foobar.edu EXCEPT terminalserver.foobar.edu
> > #
> > # If you're going to protect the portmapper use the name "rpcbind" for
> the
> > # daemon name. See rpcbind(8) and rpc.mountd(8) for further information.
> > #
> >
> > ALL: ALL
> > root at guslogs:/etc/audit#
> >
> >
> > Best Regards,
> > Rituraj B
> >
> > On Tue, Oct 3, 2017 at 6:14 PM, Steve Grubb <sgrubb at redhat.com> wrote:
> > > On Monday, October 2, 2017 11:31:15 PM EDT Rituraj Buddhisagar wrote:
> > > > P
> > > > lease see inline-
> > > >
> > > > regards
> > > >
> > > >
> > > > On Tue, Oct 3, 2017 at 3:28 AM, Steve Grubb <sgrubb at redhat.com>
> wrote:
> > > > > On Monday, October 2, 2017 2:55:51 PM EDT Rituraj Buddhisagar
> wrote:
> > > > > > Hi
> > > > > >
> > > > > > I tried my best to configure the audisp-remote.
> > > > > > I am getting below error on the client machine in
> /var/log/syslog.
> > > > > >
> > > > > > Oct 2 14:41:15 xxxxxx audisp-remote: Error connecting to
> > >
> > > 192.168.103.7:
> > > > > > Connection refused
> > > > >
> > > > > On the server, what do you get for:
> > > > >
> > > > > ausearch --start recent -m DAEMON_ACCEPT -i
> > > > >
> > > > > The server side records some information about why it did not
> allow a
> > > > > connection.
> > > >
> > > > I dont see any info in here.
> > > >
> > > > # ausearch --start recent -m DAEMON_ACCEPT -i
> > > > <no matches>
> > >
> > > Then its not connecting at all. Maybe your firewall is blocking it.
> Maybe
> > > selinux is blocking it? Once auditd sees its socket is readable, it
> calls
> > > accept(2) and there is no path through the code that doesn't log an
> event
> > > with
> > > a reason. Every possible failure logs a distinct reason why the
> connection
> > > failed.
> > >
> > > > I tried without --start & -i options as well.
> > >
> > > --start today if you didn't connect within 10 minutes of running the
> > > command.
> > >
> > > > But when I do a tcpdump on central server, I do see requests coming
> in.
> > >
> > > (I
> > >
> > > > changed port to 60).
> > > > # tcpdump -i eth1 '( port 60 )'
> > > > 08:53:56.597946 IP gusm1.60 > 192.168.103.7.60: Flags [S], seq
> > >
> > > 4076269451,
> > >
> > > > win 29200, options [mss 1460,sackOK,TS val 207316 ecr 0,nop,wscale
> 7],
> > > > length 0
> > > > 08:53:56.597980 IP 192.168.103.7.60 > gusm1.60: Flags [R.], seq 0,
> ack
> > > > 4076269452, win 0, length 0
> > > > 08:53:56.598843 IP gusm1.60 > 192.168.103.7.60: Flags [S], seq
> > >
> > > 4076287474,
> > >
> > > > win 29200, options [mss 1460,sackOK,TS val 207316 ecr 0,nop,wscale
> 7],
> > > > length 0
> > > > 08:53:56.598858 IP 192.168.103.7.60 > gusm1.60: Flags [R.], seq 0,
> ack
> > > > 18024, win 0, length 0
> > > > 08:53:56.599164 IP gusm1.60 > 192.168.103.7.60: Flags [S], seq
> > >
> > > 4076300652,
> > >
> > > > win 29200, options [mss 1460,sackOK,TS val 207316 ecr 0,nop,wscale
> 7],
> > > > length 0
> > > > 08:53:56.599175 IP 192.168.103.7.60 > gusm1.60: Flags [R.], seq 0,
> ack
> > > > 31202, win 0, length 0
> > > > 08:53:56.599657 IP gusm1.60 > 192.168.103.7.60: Flags [S], seq
> > >
> > > 4076306151,
> > >
> > > > win 29200, options [mss 1460,sackOK,TS val 207316 ecr 0,nop,wscale
> 7],
> > > > length 0
> > > >
> > > > I think the service is only listening locally and not for remote
> > > > connections?
> > >
> > > It opens a socket on all addresses.
> > > # netstat -tanp | grep auditd
> > > tcp 0 0 0.0.0.0:60 0.0.0.0:*
> LISTEN
> > > 893/auditd
> > >
> > > > root at logs:/etc/audit# lsof -i :60
> > > > COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
> > > > audisp-re 1713 root 3u IPv4 17433 0t0 TCP 192.168.103.7:60
> ->
> > > > 192.168.103.7:60 (ESTABLISHED)
> > > >
> > > >
> > > > How do I see that I am using libwrap?
> > >
> > > It should have a config line in auditd.conf. If you do not, it
> defaults to
> > > yes. That means it looks in /etc/hosts.allow and hosts.deny to decide.
> > > Odds
> > > are you put nothing there and the connection proceeds. If I were to
> guess,
> > > I'd
> > > say iptables is blocking your connection.
> > >
> > > > I have enable_krb5=no in the
> > > > auditd.conf on the aggregative server.
> > >
> > > Good. Cause doing a krb5 connection without setting that up will cause
> it
> > > to
> > > fail also. I'd bet on iptables being the problem.
> > >
> > > -Steve
> > >
> > > > > > 192.168.103.7 is the IP address of the central log server.
> > > > > >
> > > > > > Notes: My settings are below:
> > > > > >
> > > > > > on server as well on client:
> > > > > > /etc/audisp/audisp-remote
> > > > > >
> > > > > > remote_server = 192.168.103.7
> > > > > > port = 6999
> > > > > > local_port = 6999
> > > > > > transport = tcp
> > > > > > queue_file = /var/spool/audit/remote.log
> > > > > > mode = immediate
> > > > > > queue_depth = 2048
> > > > > > format = ascii
> > > > > > network_retry_time = 100
> > > > >
> > > > > This is probably not your problem but managed is the normal setting
> > > > > for
> > > > > format. And do you have enable_krb5 set to no?
> > > > >
> > > > > > I have enabled name_format=HOSTNAME only in one place (in
> > > > > > /etc/audisp/audispd.conf - and not in /etc/audit/auditd.conf
> > > > > >
> > > > > > entries in auditd.conf:
> > > > > >
> > > > > > rtcp_listen_port = 6999
> > > > > > tcp_listen_queue = 5
> > > > > > tcp_max_per_addr = 10
> > > > > > tcp_client_ports = 0-65535
> > > > > > tcp_client_max_idle = 0
> > > > >
> > > > > What do you have for use_libwrap and enable_krb5?
> > > > >
> > > > > The ausearcn info from the aggregating server should tell the
> reason
> > >
> > > why
> > >
> > > > > the
> > > > > connection is rejected.
> > > > >
> > > > > -Steve
> > > > >
> > > > > > I see the server is listening on the port 6999 as below but its
> not
> > > > > > accepting client request.
> > > > > > root at logs:/etc# lsof -i :6999
> > > > > > COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
> > > > > > audisp-re 9091 root 3u IPv4 33671 0t0 TCP
> > >
> > > 192.168.103.7:6999
> > >
> > > > > ->
> > > > >
> > > > > > 192.168.103.7:6999 (ESTABLISHED)
> > > > > >
> > > > > >
> > > > > >
> > > > > > Best Regards,
> > > > > > Rituraj B
>
>
>
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