[ossec-list] SSH brute force and firewall drop.

["Fletch Hasues" <hasues@xxxxxxxxx>]

Greetings,
  I am trying to configure a host to prevent access via firewall drop by using the rules that I see firing, and lately those are of multiple authentication failures.  So far, I have not been able to get active response to make use of the 
firewall-drop.sh script to block access.  if I login with a false user and try to login, I see the logs noting that this is happening, and it does send out e-mail, but the active-response fails to firewall the IP.

Received From: myhost->/var/log/everything/current
Rule: 40111 fired (level 10) -> "Multiple authentication failures."
Portion of the log(s):

Jul 16 21:37:18 [sshd(pam_unix)] authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=remoteIP
Jul 16 21:37:16 [sshd] error: PAM: Authentication failure for illegal user fred from  remoteIP
Jul 16 21:37:14 [sshd(pam_unix)] authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost= remoteIP
Jul 16 21:37:10 [sshd] error: PAM: Authentication failure for illegal user fred from remoteIP


My ossec.conf file appears as:

<ossec_config>
  <global>
    <email_notification>yes</email_notification>
    <email_to>myemail</email_to>
    <smtp_servermysmtp</smtp_server>
    <email_from>
ossecm@myhost</email_from>
  </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>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>hordeimp_rules.xml</include>
    <include>vpopmail_rules.xml</include>
    <include>web_rules.xml</include>
    <include>apache_rules.xml</include>
    <include>ids_rules.xml</include>
    <include>squid_rules.xml</include>
    <include>firewall_rules.xml</include>
    <include>netscreenfw_rules.xml</include>
    <include>postfix_rules.xml</include>
    <include>sendmail_rules.xml</include>
    <include>imapd_rules.xml</include>
    <include>mailscanner_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>policy_rules.xml</include> -->
    <include>attack_rules.xml</include>
    <include>zeus_rules.xml</include>
    <include>ossec_rules.xml</include>
    <include>local_rules.xml</include>
  </rules>

  <syscheck>
    <!-- Frequency that syscheck is executed - default to every 6 hours -->
    <frequency>21600</frequency>

    <!-- Directories to check  (perform all possible verifications) -->
    <directories check_all="yes">/etc,/usr/bin,/usr/sbin</directories>
    <directories check_all="yes">/bin,/sbin</directories>

    <!-- Files/directories to ignore -->
    <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>

    <!-- Windows files to ignore -->
    <ignore>C:\WINDOWS/System32/LogFiles</ignore>
    <ignore>C:\WINDOWS/Debug</ignore>
    <ignore>C:\WINDOWS/WindowsUpdate.log</ignore>
    <ignore>C:\WINDOWS/iis6.log</ignore>
    <ignore>C:\WINDOWS/system32/wbem/Logs</ignore>
    <ignore>C:\WINDOWS/system32/wbem/Repository</ignore>
    <ignore>C:\WINDOWS/Prefetch</ignore>
    <ignore>C:\WINDOWS/PCHEALTH/HELPCTR/DataColl</ignore>
    <ignore>C:\WINDOWS/SoftwareDistribution</ignore>
    <ignore>C:\WINDOWS/Temp</ignore>
    <ignore>C:\WINDOWS/system32/config</ignore>
    <ignore>C:\WINDOWS/system32/spool</ignore>
    <ignore>C:\WINDOWS/system32/CatRoot</ignore>
  </syscheck>

  <rootcheck>
    <rootkit_files>/var/ossec/etc/shared/rootkit_files.txt</rootkit_files>
    <rootkit_trojans>/var/ossec/etc/shared/rootkit_trojans.txt</rootkit_trojans>
  </rootcheck>

  <global>
    <white_list>127.0.0.1</white_list>
    <white_list>^localhost.localdomain$</white_list>
    <white_list>
192.168.74.1</white_list>
    <white_list>192.168.74.85</white_list>
    <white_list>192.168.74.15
</white_list>
  </global>

  <alerts>
    <log_alert_level>1</log_alert_level>
    <email_alert_level>7</email_alert_level>
  </alerts>

  <command>
    <name>host-deny</name>
    <executable>host-deny.sh</executable>
    <expect>srcip</expect>
    <timeout_allowed>yes</timeout_allowed>
  </command>

  <command>
    <name>firewall-drop</name>
    <executable>firewall-drop.sh</executable>
    <expect>srcip</expect>
    <timeout_allowed>yes</timeout_allowed>
  </command>

  <command>
    <name>disable-account</name>
    <executable>disable-account.sh</executable>
    <expect>user</expect>
    <timeout_allowed>yes</timeout_allowed>
  </command>

  <command>
    <name>route-null</name>
    <executable>route-null.sh</executable>
    <expect>srcip</expect>
    <timeout_allowed>yes</timeout_allowed>
  </command>


  <!-- Active Response Config -->
  <active-response>
    <!-- This response is going to execute the host-deny
       - command for every event that fires a rule with
       - level (severity) >= 6.
       - The IP is going to be blocked for  600 seconds.
      -->
    <command>host-deny</command>
    <location>local</location>
    <level>6</level>
    <timeout>600</timeout>
  </active-response>

  <active-response>
    <!-- Firewall Drop response. Block the IP for
       - 600 seconds on the firewall (iptables,
       - ipfilter, etc).
      -->
    <command>firewall-drop</command>
    <location>local</location>
    <level>6</level>
    <timeout>600</timeout>
  </active-response>

  <!-- Files to monitor (localfiles) -->
    <localfile>
      <location>/var/log/everything/current</location>
      <log_format>syslog</log_format>
    </localfile>
</ossec_config>

What am I missing?  Anyone?

Fletch