On Wed, Sep 4, 2013 at 12:25 PM, <[email protected]> wrote:
> On Wednesday, September 4, 2013 9:10:11 AM UTC-7, dan (ddpbsd) wrote:
>>
>> On Wed, Sep 4, 2013 at 12:00 PM, <[email protected]> wrote:
>> >
>> >
>> > On Wednesday, September 4, 2013 6:49:26 AM UTC-7, dan (ddpbsd) wrote:
>> >>
>> >> On Tue, Sep 3, 2013 at 11:37 PM, <[email protected]> wrote:
>> >> > I'm running OSSEC 2.7 on CentOS 6.4 (Both Manager and Agent) I'm
>> >> > trying
>> >> > to
>> >> > get a centralized agent configuration going.
>> >> >
>> >> > I've set both the Manager and Agent to run at debug level 2. I have
>> >> > verified
>> >> > that the firewall is disabled on both hosts and they are on the same
>> >> > subnet.
>> >> >
>> >> > I'm attempting to make any modifications to agent.conf on the manager
>> >> > restart the ossec agent on the remote system.
>> >> >
>> >> > When I make a modification to the /var/ossec/etc/shared/agent.conf
>> >> > file
>> >> > and
>> >> > watch the ossec.log on the manager I see the message:
>> >> >
>> >> > ossec-remoted: DEBUG Sending file 'merged.mg' to agent.
>> >> >
>> >> > As soon as the manager sends merged.mg to the Agent I see numerous
>> >> > lines
>> >> > like the following:
>> >> >
>> >> > ossec-agentd: WARN: Unknown message received. No action defined.
>> >> >
>> >>
>> >> Try stopping the ossec processes on the server, moving merged.mg to
>> >> another directory, and starting the processes back up. If I'm
>> >> understanding the code correctly (and there is a good possibility I am
>> >> not right now), there is something in the merged.mg that isn't liked.
>> >> Perhaps make sure there are not odd files in the shared directory.
>> >>
>> > I stopped the ossec processes the manager (/var/ossec/bin/ossec-control
>> > stop) and rm'd the merged.mg in /var/ossec/etc/shared/. After restarting
>> > the
>> > the manager I see the same symptoms.
>> >
>> > On the Manager:
>> > 2013/09/04 08:51:11 ossec-remoted: DEBUG Sending file 'merged.mg' to
>> > agent.
>> >
>> > On the Agent:
>> > 2013/09/04 08:51:11 ossec-agentd: WARN: Unknown message received. No
>> > action
>> > defined.
>> >
>>
>> Is something not working correctly? If everything seems to be working
>> you could ignore the warning. You could also add some debug messages
>> to the code to help debug the issue.
>>
>
> The agent is not being restarted when the new agent.conf is pushed out.
>
Make sure 510010 is firing.
You can modify the line that looks like:
merror("%s: WARN: Unknown message received. No action defined.",
in src/client-agent/receiver.c to print tmp_msg as well.
>>
>> > I don't see any strange items in /var/ossec/etc/shared:
>> > [root@ossec_server shared]# ls -la
>> > total 176
>> > drwxrwx---. 2 root ossec 4096 Sep 4 08:56 .
>> > dr-xr-x---. 3 root ossec 4096 Sep 3 20:26 ..
>> > -rw-r--r--. 1 root ossec 354 Sep 4 08:47 agent.conf
>> > -r--r-----. 1 root ossec 115 Sep 4 08:47 ar.conf
>> > -r--r-----. 1 root ossec 9501 Nov 8 2012 cis_debian_linux_rcl.txt
>> > -r--r-----. 1 root ossec 8192 Nov 8 2012 cis_rhel5_linux_rcl.txt
>> > -r--r-----. 1 root ossec 14251 Nov 8 2012 cis_rhel_linux_rcl.txt
>> > -rw-r--r--. 1 ossecr ossec 70684 Sep 4 08:47 merged.mg
>> > -r--r-----. 1 root ossec 14872 Nov 8 2012 rootkit_files.txt
>> > -r--r-----. 1 root ossec 5193 Nov 8 2012 rootkit_trojans.txt
>> > -r--r-----. 1 root ossec 4457 Nov 8 2012 system_audit_rcl.txt
>> > -r--r-----. 1 root ossec 4682 Nov 8 2012 win_applications_rcl.txt
>> > -r--r-----. 1 root ossec 3859 Nov 8 2012 win_audit_rcl.txt
>> > -r--r-----. 1 root ossec 4929 Nov 8 2012 win_malware_rcl.txt
>> >
>> > I've attached my merged.mg file.
>> >
>> >> > I assume I have something improperly configured on the agent.
>> >> >
>> >> > Here are the contents of agent.conf and ossec.conf on the Agent:
>> >> >
>> >> > agent.conf:
>> >> > <agent_config>
>> >> > <syscheck>
>> >> > <frequency>3600</frequency>
>> >>
>> >> I don't believe these 2 items do anything on agents.
>> >
>> >
>> > Just to be clear your suggesting that auto_ignore and alert_new_files
>> > don't
>> > belong on agents? Seems to make sense since all the agent does is report
>> > the
>> > changes, I'll update the agent.conf.
>> >
>> >>
>> >> > <auto_ignore>no</auto_ignore>
>> >> > <alert_new_files>yes</alert_new_files>
>> >>
>> >>
>> >> > <scan_on_start>no</scan_on_start>
>> >> > <directories report_changes="yes"
>> >> >
>> >> >
>> >> > check_all="yes">/etc,/usr/bin,/usr/sbin,/opt/ossec/etc/shared</directories>
>> >> > </syscheck>
>> >> >
>> >> > </agent_config>
>> >> >
>> >> > ossec.conf
>> >> > <ossec_config>
>> >> > <client>
>> >> > <server-ip>192.168.140.138</server-ip>
>> >> > </client>
>> >> >
>> >> > </ossec_config>
>> >> >
>> >> >
>> >> > Here is the ossec.conf on the Manager:
>> >> >
>> >> > <ossec_config>
>> >> > <global>
>> >> > <email_notification>no</email_notification>
>> >> > </global>
>> >> >
>> >> > <rules>
>> >> > <include>rules_config.xml</include>
>> >> > <include>pam_rules.xml</include>
>> >> > <include>sshd_rules.xml</include>
>> >> > <include>telnetd_rules.xml</include>
>> >> > <include>syslog_rules.xml</include>
>> >> > <include>arpwatch_rules.xml</include>
>> >> > <include>symantec-av_rules.xml</include>
>> >> > <include>symantec-ws_rules.xml</include>
>> >> > <include>pix_rules.xml</include>
>> >> > <include>named_rules.xml</include>
>> >> > <include>smbd_rules.xml</include>
>> >> > <include>vsftpd_rules.xml</include>
>> >> > <include>pure-ftpd_rules.xml</include>
>> >> > <include>proftpd_rules.xml</include>
>> >> > <include>ms_ftpd_rules.xml</include>
>> >> > <include>ftpd_rules.xml</include>
>> >> > <include>hordeimp_rules.xml</include>
>> >> > <include>roundcube_rules.xml</include>
>> >> > <include>wordpress_rules.xml</include>
>> >> > <include>cimserver_rules.xml</include>
>> >> > <include>vpopmail_rules.xml</include>
>> >> > <include>vmpop3d_rules.xml</include>
>> >> > <include>courier_rules.xml</include>
>> >> > <include>web_rules.xml</include>
>> >> > <include>web_appsec_rules.xml</include>
>> >> > <include>apache_rules.xml</include>
>> >> > <include>nginx_rules.xml</include>
>> >> > <include>php_rules.xml</include>
>> >> > <include>mysql_rules.xml</include>
>> >> > <include>postgresql_rules.xml</include>
>> >> > <include>ids_rules.xml</include>
>> >> > <include>squid_rules.xml</include>
>> >> > <include>firewall_rules.xml</include>
>> >> > <include>cisco-ios_rules.xml</include>
>> >> > <include>netscreenfw_rules.xml</include>
>> >> > <include>sonicwall_rules.xml</include>
>> >> > <include>postfix_rules.xml</include>
>> >> > <include>sendmail_rules.xml</include>
>> >> > <include>imapd_rules.xml</include>
>> >> > <include>mailscanner_rules.xml</include>
>> >> > <include>dovecot_rules.xml</include>
>> >> > <include>ms-exchange_rules.xml</include>
>> >> > <include>racoon_rules.xml</include>
>> >> > <include>vpn_concentrator_rules.xml</include>
>> >> > <include>spamd_rules.xml</include>
>> >> > <include>msauth_rules.xml</include>
>> >> > <include>mcafee_av_rules.xml</include>
>> >> > <include>trend-osce_rules.xml</include>
>> >> > <include>ms-se_rules.xml</include>
>> >> > <!-- <include>policy_rules.xml</include> -->
>> >> > <include>zeus_rules.xml</include>
>> >> > <include>solaris_bsm_rules.xml</include>
>> >> > <include>vmware_rules.xml</include>
>> >> > <include>ms_dhcp_rules.xml</include>
>> >> > <include>asterisk_rules.xml</include>
>> >> > <include>ossec_rules.xml</include>
>> >> > <include>attack_rules.xml</include>
>> >> > <include>openbsd_rules.xml</include>
>> >> > <include>clam_av_rules.xml</include>
>> >> > <include>bro-ids_rules.xml</include>
>> >> > <include>dropbear_rules.xml</include>
>> >> > <include>local_rules.xml</include>
>> >> > </rules>
>> >> >
>> >> > <syscheck>
>> >> > <frequency>79200</frequency>
>> >> >
>> >> > <directories
>> >> > check_all="yes">/etc,/usr/bin,/usr/sbin</directories>
>> >> > <directories check_all="yes">/bin,/sbin</directories>
>> >> >
>> >> > <ignore>/etc/mtab</ignore>
>> >> > <ignore>/etc/mnttab</ignore>
>> >> > <ignore>/etc/hosts.deny</ignore>
>> >> > <ignore>/etc/mail/statistics</ignore>
>> >> > <ignore>/etc/random-seed</ignore>
>> >> > <ignore>/etc/adjtime</ignore>
>> >> > <ignore>/etc/httpd/logs</ignore>
>> >> > <ignore>/etc/utmpx</ignore>
>> >> > <ignore>/etc/wtmpx</ignore>
>> >> > <ignore>/etc/cups/certs</ignore>
>> >> > <ignore>/etc/dumpdates</ignore>
>> >> > <ignore>/etc/svc/volatile</ignore>
>> >> > </syscheck>
>> >> >
>> >> > <rootcheck>
>> >> > <disabled>yes</disabled>
>> >> >
>> >> >
>> >> > <rootkit_files>/var/ossec/etc/shared/rootkit_files.txt</rootkit_files>
>> >> >
>> >> >
>> >> >
>> >> > <rootkit_trojans>/var/ossec/etc/shared/rootkit_trojans.txt</rootkit_trojans>
>> >> >
>> >> >
>> >> > <system_audit>/var/ossec/etc/shared/system_audit_rcl.txt</system_audit>
>> >> >
>> >> >
>> >> >
>> >> > <system_audit>/var/ossec/etc/shared/cis_debian_linux_rcl.txt</system_audit>
>> >> >
>> >> >
>> >> >
>> >> > <system_audit>/var/ossec/etc/shared/cis_rhel_linux_rcl.txt</system_audit>
>> >> >
>> >> >
>> >> >
>> >> > <system_audit>/var/ossec/etc/shared/cis_rhel5_linux_rcl.txt</system_audit>
>> >> > </rootcheck>
>> >> >
>> >> > <global>
>> >> > <white_list>127.0.0.1</white_list>
>> >> > <white_list>^localhost.localdomain$</white_list>
>> >> > <white_list>192.168.140.2</white_list>
>> >> > </global>
>> >> >
>> >> > <remote>
>> >> > <connection>syslog</connection>
>> >> > </remote>
>> >> >
>> >> > <remote>
>> >> > <connection>secure</connection>
>> >> > </remote>
>> >> >
>> >> > <alerts>
>> >> > <log_alert_level>1</log_alert_level>
>> >> > </alerts>
>> >> >
>> >> > <command>
>> >> > <name>restart-ossec</name>
>> >> > <executable>restart-ossec.sh</executable>
>> >> > <expect></expect>
>> >> > </command>
>> >> >
>> >> > <active-response>
>> >> > <command>restart-ossec</command>
>> >> > <location>local</location>
>> >> > <rules_id>510010</rules_id>
>> >> > </active-response>
>> >> >
>> >> > </ossec_config>
>> >> >
>> >> > I have the following rule defined in
>> >> > /var/ossec/rules/local_rules.xml:
>> >> >
>> >> > <rule id="510010" level="10">
>> >> > <if_sid>550</if_sid>
>> >> > <match>/var/ossec/etc/shared/agent.conf</match>
>> >> > <description>agent.conf has been modified.</description>
>> >> > </rule>
>> >> >
>> >> >
>> >> > Here are the permissions of /var/ossec/etc/shared on the Manager:
>> >> >
>> >> > [root@ossec_server shared]# ls -la
>> >> > total 176
>> >> > drwxrwx---. 2 root ossec 4096 Sep 3 20:34 .
>> >> > dr-xr-x---. 3 root ossec 4096 Sep 3 20:26 ..
>> >> > -rw-r--r--. 1 root ossec 344 Sep 3 20:34 agent.conf
>> >> > -r--r-----. 1 root ossec 115 Sep 3 20:34 ar.conf
>> >> > -r--r-----. 1 root ossec 9501 Nov 8 2012
>> >> > cis_debian_linux_rcl.txt
>> >> > -r--r-----. 1 root ossec 8192 Nov 8 2012 cis_rhel5_linux_rcl.txt
>> >> > -r--r-----. 1 root ossec 14251 Nov 8 2012 cis_rhel_linux_rcl.txt
>> >> > -rw-r--r--. 1 ossecr ossec 70680 Sep 3 20:34 merged.mg
>> >> > -r--r-----. 1 root ossec 14872 Nov 8 2012 rootkit_files.txt
>> >> > -r--r-----. 1 root ossec 5193 Nov 8 2012 rootkit_trojans.txt
>> >> > -r--r-----. 1 root ossec 4457 Nov 8 2012 system_audit_rcl.txt
>> >> > -r--r-----. 1 root ossec 4682 Nov 8 2012
>> >> > win_applications_rcl.txt
>> >> > -r--r-----. 1 root ossec 3859 Nov 8 2012 win_audit_rcl.txt
>> >> > -r--r-----. 1 root ossec 4929 Nov 8 2012 win_malware_rcl.txt
>> >> >
>> >> > Here they are on the Agent:
>> >> > [root@CentOS1 shared]# ls -la
>> >> > total 176
>> >> > drwxrwx---. 2 root ossec 4096 Sep 3 19:51 .
>> >> > dr-xr-x---. 3 root ossec 4096 Sep 3 20:03 ..
>> >> > -rw-r--r--. 1 ossec ossec 344 Sep 3 20:21 agent.conf
>> >> > -rw-r--r--. 1 ossec ossec 115 Sep 3 20:21 ar.conf
>> >> > -rwxrwx---. 1 root ossec 9501 Sep 3 20:21 cis_debian_linux_rcl.txt
>> >> > -rwxrwx---. 1 root ossec 8192 Sep 3 20:21 cis_rhel5_linux_rcl.txt
>> >> > -rwxrwx---. 1 root ossec 14251 Sep 3 20:21 cis_rhel_linux_rcl.txt
>> >> > -rw-r--r--. 1 ossec ossec 70674 Sep 3 20:21 merged.mg
>> >> > -rwxrwx---. 1 root ossec 14872 Sep 3 20:21 rootkit_files.txt
>> >> > -rwxrwx---. 1 root ossec 5193 Sep 3 20:21 rootkit_trojans.txt
>> >> > -rwxrwx---. 1 root ossec 4457 Sep 3 20:21 system_audit_rcl.txt
>> >> > -rwxrwx---. 1 root ossec 4682 Sep 3 20:21 win_applications_rcl.txt
>> >> > -rwxrwx---. 1 root ossec 3859 Sep 3 20:21 win_audit_rcl.txt
>> >> > -rwxrwx---. 1 root ossec 4929 Sep 3 20:21 win_malware_rcl.txt
>> >> >
>> >> >
>> >> > The remote agent responds to /var/ossec/bin/agent-control -R 1024
>> >> > right
>> >> > away
>> >> > and without issue because of this I assume Active Response is working
>> >> > in
>> >> > some fashion.
>> >> >
>> >> > Please let me know if you have any idea what is causing the "Unknown
>> >> > message
>> >> > received. No action defined." message or why the remote agents are
>> >> > not
>> >> > restarting when receiving a new agent.conf.
>> >> >
>> >> > Thanks,
>> >> > -AMM
>> >> >
>> >> > --
>> >> >
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