Re: Audisp-remote - connection refused.

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! root@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@guslogs:/etc/audit# root@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@guslogs:/etc/audit# root@guslogs:/etc/audit# netstat -tanp | grep auditd root@guslogs:/etc/audit# root@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@guslogs:/etc/audit# root@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@guslogs:/etc/audit# Best Regards, Rituraj B On Tue, Oct 3, 2017 at 6:14 PM, Steve Grubb <sgrubb(a)redhat.com&gt; 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(a)redhat.com&gt; 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@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@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 > > >