This will execute salt-call state.highstate -l info which outputs to the terminal with the log level set to info so that you can see exactly whats happening: Many of the options that are configurable in Security Onion 2 are done via pillar assignments in either the global or minion pillar files. In this file, the idstools section has a modify sub-section where you can add your modifications. How are they parsed? This first sub-section will discuss network firewalls outside of Security Onion. You may want to bump the SID into the 90,000,000 range and set the revision to 1. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. Once your rules and alerts are under control, then check to see if you have packet loss. At the end of this example IPs in the analyst host group, will be able to connect to 80, 443 and 8086 on our standalone node. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. 5. Security Onion offers the following choices for rulesets to be used by Snort/Suricata: ET Open optimized for Suricata, but available for Snort as well free For more information, see: https://rules.emergingthreats.net/open/ ET Pro (Proofpoint) optimized for Suricata, but available for Snort as well rules retrievable as released You are an adult, at least 18 years of age, you are familiar with and understand the standards and laws of your local community regarding sexually-oriented media. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. to security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. I've just updated the documentation to be clearer. Find Age Regression Discord servers and make new friends! Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. When configuring network firewalls for Internet-connected deployments (non-Airgap), youll want to ensure that the deployment can connect outbound to the following: In the case of a distributed deployment, you can configure your nodes to pull everything from the manager so that only the manager requires Internet access. In the image below, we can see how we define some rules for an eval node. To enable the Talos Subscriber ruleset in an already installed grid, modify the /opt/so/saltstack/local/pillar/minions/ file as follows: To add other remotely-accessible rulesets, add an entry under urls for the ruleset URL in /opt/so/saltstack/local/pillar/minions/: Copyright 2023 Copyright 2023 Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: Set anywhere from 5 to 12 in the local_rules Kevin. For example, consider the following rules that reference the ET.MSSQL flowbit. The second only needs the $ character escaped to prevent bash from treating that as a variable. Its important to note that with this functionality, care should be given to the suppressions being written to make sure they do not suppress legitimate alerts. Full Name. 3. If you have multiple entries for the same SID, it will cause an error in salt resulting in all of the nodes in your grid to error out when checking in. For example, if ips_policy was set to security, you would add the following to each rule: The whole rule would then look something like: alert tcp any any -> $HOME_NET 7789 (msg: "Vote for Security Onion Toolsmith Tool of 2011! Revision 39f7be52. For example, if ips_policy was set to security, you would add the following to each rule: The whole rule would then look something like: These policy types can be found in /etc/nsm/rules/downloaded.rules. This way, you still have the basic ruleset, but the situations in which they fire are altered. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. If so, then tune the number of AF-PACKET workers for sniffing processes. The server is also responsible for ruleset management. It is now read-only. Was this translation helpful? /opt/so/saltstack/default/salt/firewall/assigned_hostgroups.map.yaml is where the default allow rules come together and pair hostgroups and portgroups and assign that pairing to a node based on its role in the grid. Revision 39f7be52. in Sguil? Adding local rules in Security Onion is a rather straightforward process. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. In many of the use cases below, we are providing the ability to modify a configuration file by editing either the global or minion pillar file. You can do so via the command line using curl: Alternatively, you could also test for additional hits with a utility called tmNIDS, running the tool in interactive mode: If everything is working correctly, you should see a corresponding alert (GPL ATTACK_RESPONSE id check returned root) in Alerts, Dashboards, Hunt, or Kibana. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Revision 39f7be52. To enabled them, either revert the policy by remarking the ips_policy line (and run rule-update), or add the policy type to the rules in local.rules. Some of these refer to areas where data is stored, while others point to configuration files that can be modified to change how Security Onion interacts with various tools. A new version of our securityonion-rule-update package is now available that distributes OSSEC's local_rules.xml from master server to slave sensors by default and also allows for NIDS/HIDS rule tuning per physical sensor. In a distributed Security Onion environment, you only need to change the configuration in the manager pillar and then all other nodes will get the updated rules automatically. If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. There may be entire categories of rules that you want to disable first and then look at the remaining enabled rules to see if there are individual rules that can be disabled. For example, suppose we want to disable SID 2100498. You signed in with another tab or window. But after I run the rule-update command, no alert is generated in Sguil based on that rule.It was working when I first installed Security Onion. Please note if you are using a ruleset that enables an IPS policy in /etc/nsm/pulledpork/pulledpork.conf, your local rules will be disabled. It . Security Onion is a intrusion detection and network monitoring tool. Where is it that you cannot view them? . If you pivot from that alert to the corresponding pcap you can verify the payload we sent. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. When editing these files, please be very careful to respect YAML syntax, especially whitespace. To enable the ET Pro ruleset in an already installed grid, modify the /opt/so/saltstack/local/pillar/minions/ file as follows: Since Shared Object rules wont work with Suricata, you may want to disable them using a regex like 're:soid [0-9]+' as described in the Managing Alerts section. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. Logs. Copyright 2023 Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. This writeup contains a listing of important Security Onion files and directories. If you would like to pull in NIDS rules from a MISP instance, please see: Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. In a distributed deployment, the manager node controls all other nodes via salt. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. When setup is run on a new node, it will SSH to the manager using the soremote account and add itself to the appropriate host groups. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. Are you sure you want to create this branch? 1. Security Onion is a platform that allows you to monitor your network for security alerts. Open /etc/nsm/rules/local.rules using your favorite text editor. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. to security-onion yes it is set to 5, I have also played with the alert levels in the rules to see if the number was changing anything. Let's add a simple rule that will alert on the detection of a string in a tcp session. /opt/so/saltstack/local/pillar/minions/, https://www.proofpoint.com/us/threat-insight/et-pro-ruleset, https://www.snort.org/downloads/#rule-downloads, https://www.snort.org/faq/what-are-community-rules, https://snort.org/documents/registered-vs-subscriber, license fee per sensor (users are responsible for purchasing enough licenses for their entire deployment), Snort SO (Shared Object) rules only work with Snort not, same rules as Snort Subscriber ruleset, except rules only retrievable after 30 days past release, not officially managed/supported by Security Onion. Please note if you are using a ruleset that enables an IPS policy in /etc/nsm/pulledpork/pulledpork.conf, your local rules will be disabled. Adding Local Rules Security Onion 2.3 documentation Docs Tuning Adding Local Rules Edit on GitHub Adding Local Rules NIDS You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: sudo vi /opt/so/rules/nids/local.rules Paste the rule. > > > > > > > > Cheers, Andi > > > > > > > > > > -- Mit besten Gren Shane Castle > > > > -- > Mit besten Gren > Shane Castle > > -- > You received this message because you are subscribed to a topic in the > Google Groups "security-onion" group. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. To unsubscribe from this group and stop receiving emails from it, send an email to. > > => I do not know how to do your guilde line. If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. Please review the Salt section to understand pillars and templates. we run SO in a distributed deployment and the manager doesn't run strelka but does run on the sensor, the paths however (/opt/so/saltstack/local/salt/strelka/rules) exist on the manger but not the sensor, I did find the default repo under opt/so/saltstack/default/salt/strelka/rules/ on the manager and I can run so-yara-update but not so-strelka-restart because its not running on the manager so I'm a little confused on where I should be putting the custom YARA rules because things don't line up with the documentation or I'm just getting super confused. 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