To enable or disable SIDs for Suricata, the Salt idstools pillar can be used in the minion pillar file (/opt/so/saltstack/local/pillar/minions/_.sls). https://securityonion.net/docs/AddingLocalRules. If you try to disable the first two rules without disabling the third rule (which has flowbits:isset,ET.MSSQL) the third rule could never fire due to one of the first two rules needing to fire first. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. Revision 39f7be52. If you need to manually update your rules, you can run the following on your manager node: If you have a distributed deployment and you update the rules on your manager node, then those rules will automatically replicate from the manager node to your sensors within 15 minutes. Security Onion is a intrusion detection and network monitoring tool. If you would like to pull in NIDS rules from a MISP instance, please see: 2GB RAM will provide decent performance for the Sguil client and retrieving packet captures from the server but also enough to run Security Onion in standalone mode for monitoring the local client and testing packet captures with tools like tcpreplay, The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. For example, if you want to modify SID 2009582 and change $EXTERNAL_NET to $HOME_NET: The first string is a regex pattern, while the second is just a raw value. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. We created and maintain Security Onion, so we know it better than anybody else. Beta jq; so-allow; so-elastic-auth; so . You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. Between Zeek logs, alert data from Suricata, and full packet capture from Stenographer, you have enough information to begin identifying areas of interest and making positive changes to your security stance. Set anywhere from 5 to 12 in the local_rules Kevin. The rule categories are Malware-Cnc, Blacklist, SQL injection, Exploit-kit, and rules from the connectivity ruleset Security: CVSS Score of 8 or higher Vulnerability age is four years old and newer The rule categories include Balanced and Connectivity with one additional category being App-detect 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. For example, if you had a web server you could include 80 and 443 tcp into an alias or in this case a port group. Network Security Monitoring, as a practice, is not a solution you can plug into your network, make sure you see blinking lights and tell people you are secure. It requires active intervention from an analyst to qualify the quantity of information presented. Managing firewall rules for all devices should be done from the manager node using either so-allow, so-firewall or, for advanced cases, manually editing the yaml files. If you dont want to wait 15 minutes, you can force the sensors to update immediately by running the following command on your manager node: Security Onion offers the following choices for rulesets to be used by Suricata. For example: If you need to modify a part of a rule that contains a special character, such as a $ in variable names, the special character needs to be escaped in the search part of the modify string. This wiki is no longer maintained. If you dont want to wait for these automatic processes, you can run them manually from the manager (replacing $SENSORNAME_$ROLE as necessary): Lets add a simple rule to /opt/so/saltstack/local/salt/idstools/local.rules thats really just a copy of the traditional id check returned root rule: Restart Suricata (replacing $SENSORNAME_$ROLE as necessary): If you built the rule correctly, then Suricata should be back up and running. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) When you purchase products and services from us, you're helping to fund development of Security Onion! All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. If there are a large number of uncategorized events in the securityonion_db database, sguil can have a hard time of managing the vast amount of data it needs to process to present a comprehensive overview of the alerts. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. Security Onion offers the following choices for rulesets to be used by Suricata. Run rule-update (this will merge local.rules into downloaded.rules, update. The remainder of this section will cover the host firewall built into Security Onion. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. /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. Give feedback. The ip addresses can be random, but I would suggest sticking to RFC1918: Craft the layer 3 information Since we specified port 7789 in our snort rule: Use the / operator to compose our packet and transfer it with the send() method: Check Sguil/Squert/Kibana for the corresponding alert. 5. How are they parsed? Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. Revision 39f7be52. 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. Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. If you built the rule correctly, then snort should be back up and running. These policy types can be found in /etc/nsm/rules/downloaded.rules. 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. IPS Policy There are many ways to achieve age regression, but the three primary methods are: Botox. MISP Rules. This will add the IPs to the host group in, Since we reused the syslog port group that is already defined, we dont need to create a new port group. If you do not see this alert, try checking to see if the rule is enabled in /opt/so/rules/nids/all.rules: Rulesets come with a large number of rules enabled (over 20,000 by default). epic charting system training In a distributed deployment, the manager node controls all other nodes via salt. Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert You can then run curl http://testmynids.org/uid/index.html on the node to generate traffic which should cause this rule to alert (and the original rule that it was copied from, if it is enabled). Can anyone tell me > > > > what I've done wrong please? Saltstack states are used to ensure the state of objects on a minion. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Copyright 2023 Add the following to the minions sls file located at. Though each engine uses its own severity level system, Security Onion converts that to a standardized alert severity: event.severity: 4 ==> event.severity_label: critical, event.severity: 3 ==> event.severity_label: high, event.severity: 2 ==> event.severity_label: medium, event.severity: 1 ==> event.severity_label: low. You may see the following error in the salt-master log located at /opt/so/log/salt/master: The root cause of this error is a state trying to run on a minion when another state is already running. Host groups and port groups can be created or modified from the manager node using either so-allow, so-firewall or manually editing the yaml files. Tracking. You may want to bump the SID into the 90,000,000 range and set the revision to 1. Then tune your IDS rulesets. If we want to allow a host or group of hosts to send syslog to a sensor, then we can do the following: In this example, we will be extending the default nginx port group to include port 8086 for a standalone node. And when I check, there are no rules there. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. There are two directories that contain the yaml files for the firewall configuration. This repository has been archived by the owner on Apr 16, 2021. Integrated into the Security Onion, OSSEC is a host-based intrusion detection system (HIDS) that can conduct file integrity monitoring, local log monitoring, system process monitoring, and rootkit detection. Diagnostic logs can be found in /opt/so/log/salt/. Please review the Salt section to understand pillars and templates. As you can see I have the Security Onion machine connected within the internal network to a hub. This first sub-section will discuss network firewalls outside of Security Onion. . To unsubscribe from this group and stop receiving emails from it, send an email to. All node types are added to the minion host group to allow Salt communication. There are multiple ways to handle overly productive signatures and well try to cover as many as we can without producing a full novel on the subject. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. Previously, in the case of an exception, the code would just pass. How are they stored? If you previously added a host or network to your firewall configuration and now need to remove them, you can use so-firewall with the excludehost option. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. If you cant run so-rule, you can modify the configuration manually in the manager pillar file at /opt/so/saltstack/local/pillar/minions/_.sls (where is manager, managersearch, standalone, or eval depending on the manager type that was chosen during install). Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. Copyright 2023 This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. We can start by listing any rules that are currently modified: Lets first check the syntax for the add option: Now that we understand the syntax, lets add our modification: Once the command completes, we can verify that our modification has been added: Finally, we can check the modified rule in /opt/so/rules/nids/all.rules: To include an escaped $ character in the regex pattern youll need to make sure its properly escaped. Please note! You signed in with another tab or window. A tag already exists with the provided branch name. For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. Boot the ISO and run through the installer. If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. Adding local rules in Security Onion is a rather straightforward process. By default, only the analyst hostgroup is allowed access to the nginx ports. At those times, it can be useful to query the database from the commandline. See above for suppress examples. More information on each of these topics can be found in this section. . Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. The firewall state is designed with the idea of creating port groups and host groups, each with their own alias or name, and associating the two in order to create an allow rule. 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. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. I've just updated the documentation to be clearer. Please update your bookmarks. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. /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. . Security Onion Peel Back the Layers of Your Enterprise Monday, January 26, 2009 Integrating Snort 3.0 (SnortSP) and Sguil in 3 Steps So once you have Snort 3.0 installed, what can you do with it? Copyright 2023 To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. However, generating custom traffic to test the alert can sometimes be a challenge. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. /opt/so/saltstack/default/salt/firewall/portgroups.yaml, /opt/so/saltstack/default/salt/firewall/hostgroups.yaml, /opt/so/saltstack/default/salt/firewall/assigned_hostgroups.map.yaml, /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml, /opt/so/saltstack/local/salt/firewall/hostgroups.local.yaml, /opt/so/saltstack/local/salt/firewall/assigned_hostgroups.local.map.yaml, /opt/so/saltstack/local/pillar/minions/_.sls, Allow hosts to send syslog to a sensor node, raw.githubusercontent.com (Security Onion public key), sigs.securityonion.net (Signature files for Security Onion containers), rules.emergingthreatspro.com (Emerging Threats IDS rules), rules.emergingthreats.net (Emerging Threats IDS open rules), github.com (Strelka and Sigma rules updates), geoip.elastic.co (GeoIP updates for Elasticsearch), storage.googleapis.com (GeoIP updates for Elasticsearch), download.docker.com (Docker packages - Ubuntu only), repo.saltstack.com (Salt packages - Ubuntu only), packages.wazuh.com (Wazuh packages - Ubuntu only), 3142 (Apt-cacher-ng) (if manager proxy enabled, this is repocache.securityonion.net as mentioned above), Create a new host group that will contain the IPs of the hosts that you want to allow to connect to the sensor. Logs. This was implemented to avoid some issues that we have seen regarding Salt states that used the ip_interfaces grain to grab the management interface IP. To get the best performance out of Security Onion, youll want to tune it for your environment.