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. How are they stored? 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 this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. This repository has been archived by the owner on Apr 16, 2021. In this step we are redefining the nginx port group, so be sure to include the default ports as well if you want to keep them: Associate this port group redefinition to a node. As you can see I have the Security Onion machine connected within the internal network to a hub. Give feedback. It is now read-only. 3. You could try testing a rule . After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . If . 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. If so, then tune the number of AF-PACKET workers for sniffing processes. Then tune your IDS rulesets. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. Started by Doug Burks, and first released in 2009, Security Onion has. 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. 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). This writeup contains a listing of important Security Onion files and directories. The county seat is in Evansville. This wiki is no longer maintained. Adding local rules in Security Onion is a rather straightforward process. Previously, in the case of an exception, the code would just pass. Security Onion Solutions, LLC is the creator and maintainer of Security Onion, a free and open platform for threat hunting, network security monitoring, and log management. 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. By default, only the analyst hostgroup is allowed access to the nginx ports. 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. . . Hi @Trash-P4nda , I've just updated the documentation to be clearer. Security Onion is a intrusion detection and network monitoring tool. Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). The error can be ignored as it is not an indication of any issue with the minions. This is an advanced case and you most likely wont never need to modify these files. You can do the reverse unit conversion from MPa to psi, or enter any two units below:LED MSI Optix G242 24 inch IPS Gaming Monitor - Full HD - 144Hz Refresh Rate - 1ms Response time - Adaptive Sync for Esports (9S6-3BA41T-039) LED MSI OPTIX G272 Gaming Monitor 27" FHD IPS 144HZ 1MS Adaptive Sync (9S6-3CB51T-036) LG 27 FHD IPS 1ms 240Hz G . Logs. > To unsubscribe from this topic . alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. We offer both training and support for Security Onion. Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. Logs . For example, to check disk space on all nodes: If you want to force a node to do a full update of all salt states, you can run so-checkin. Open /etc/nsm/rules/local.rules using your favorite text editor. To verify the Snort version, type in snort -Vand hit Enter. 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. Generate some traffic to trigger the alert. 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. To generate traffic we are going to use the python library scapy to craft packets with specific information to ensure we trigger the alert with the information we want: Craft the layer 2 information. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. However, generating custom traffic to test the alert can sometimes be a challenge. 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). For example: By default, if you use so-allow to add a host to the syslog hostgroup, that host will only be allowed to connect to the manager node. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: 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. Been looking to add some custom YARA rules and have been following the docs https://docs.securityonion.net/en/2.3/local-rules.html?#id1 however I'm a little confused. Was this translation helpful? idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. Revision 39f7be52. https://securityonion.net/docs/AddingLocalRules. If SID 4321 is noisy, you can disable it as follows: From the manager, run the following to update the config: If you want to disable multiple rules at one time, you can use a regular expression, but make sure you enclose the full entry in single quotes like this: We can use so-rule to modify an existing NIDS rule. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. A tag already exists with the provided branch name. 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. Set anywhere from 5 to 12 in the local_rules Kevin. 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. Have you tried something like this, in case you are not getting traffic to $HOME_NET? The National Institutes of Standards and Technology (NIST) 800-171 cybersecurity standard has four safeguards that are related to network traffic monitoring: 3.13.1: Monitor, control, and protect organizational communications (i.e., information transmitted or received by organizational information 5. Security Onion is a free and open-source Linux distribution prepared for intrusion detection, security monitoring, and log management with the assistance of security tools namely Snort,. Data collection Examination For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. Revision 39f7be52. We created and maintain Security Onion, so we know it better than anybody else. And when I check, there are no rules there. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. Backing up current downloaded.rules file before it gets overwritten. in Sguil? the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. From the Command Line. These non-manager nodes are referred to as salt minions. When editing these files, please be very careful to respect YAML syntax, especially whitespace. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. These are the files that will need to be changed in order to customize nodes. Security Onion is an open source suite of network security monitoring (NSM) tools for evaluating alerts, providing three core functions to the cybersecurity analyst: Full packet capture and data types Network-based and host-based intrusion detection systems Alert analysis tools 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. Please note! 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. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. 1. Salt sls files are in YAML format. 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? /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. Fresh install of Security Onion 16.04.6.3 ISO to hardware: Two NICs, one facing management network, one monitoring mirrored port for test network Setup for Production Mode, pretty much all defaults, suricata create alert rules for /etc/nsm/local.rules and run rule-update Log into scapy/msf on kalibox, send a few suspicious packets 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. Full Name. Also ensure you run rule-update on the machine. Files here should not be modified as changes would be lost during a code update. The remainder of this section will cover the host firewall built into Security Onion. Disabling all three of those rules by adding the following to disablesid.conf has the obvious negative effect of disabling all three of the rules: When you run sudo so-rule-update, watch the Setting Flowbit State section and you can see that if you disable all three (or however many rules share that flowbit) that the Enabled XX flowbits line is decremented and all three rules should then be disabled in your all.rules. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups.
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