/opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. 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. 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. 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 Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. How are they stored? Revision 39f7be52. One of those regular interventions is to ensure that you are tuning properly and proactively attempting to reach an acceptable level of signal to noise. Cleaning up local_rules.xml backup files older than 30 days. Before You Begin. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. First off, I'll briefly explain security onion security Onion is the leading open source operating system for network security monitoring, intrusion detection, log management and threat hunting. 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. You signed in with another tab or window. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. Some node types get their IP assigned to multiple host groups. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. This repository has been archived by the owner on Apr 16, 2021. However, generating custom traffic to test the alert can sometimes be a challenge. 5. Tuning NIDS Rules in Security Onion - YouTube 0:00 / 15:12 Tuning NIDS Rules in Security Onion 1,511 views Jan 10, 2022 This video shows you how to tune Suricata NIDS rules in. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. 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. The format of the pillar file can be seen below, as well as in /opt/so/saltstack/default/pillar/thresholding/pillar.usage and /opt/so/saltstack/default/pillar/thresholding/pillar.example. /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. 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. 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. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. Nodes will be configured to pull from repocache.securityonion.net but this URL does not actually exist on the Internet, it is just a special address for the manager proxy. Our instructors are the only Security Onion Certified Instructors in the world and our course material is the only authorized training material for Security Onion. 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. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. The signature id (SID) must be unique. 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. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. Add the following to the sensor minion pillar file located at. 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. Manager of Support and Professional Services. The server is also responsible for ruleset management. 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 has Snort built in and therefore runs in the same instance. See above for suppress examples. 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. 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. 4. ELSA? Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. If so, then tune the number of AF-PACKET workers for sniffing processes. Are you sure you want to create this branch? All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. If you would like to pull in NIDS rules from a MISP instance, please see: For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . 2. 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. If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. We offer both training and support for Security Onion. 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. 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. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. As you can see I have the Security Onion machine connected within the internal network to a hub. Logs. To configure syslog for Security Onion: Stop the Security Onion service. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. 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, suppose we want to disable SID 2100498. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. A. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: Then tune your IDS rulesets. Open /etc/nsm/rules/local.rules using your favorite text editor. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. 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. You could try testing a 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. so-rule allows you to disable, enable, or modify NIDS rules. The files in this directory should not be modified as they could possibly be overwritten during a soup update in the event we update those files. If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. In syslog-ng, the following configuration forwards all local logs to Security Onion. Our documentation has moved to https://securityonion.net/docs/. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. Launch your Ubuntu Server VM, log on with credentials provided at the beginning of this guide and open a terminal shell by double-clicking the Desktop shortcut. I have 3 simple use cases (1) Detect FTP Connection to our public server 129.x.x.x (2) Detect SSH Connection attempts (3) Detect NMAP scan. This wiki is no longer maintained. It is located at /opt/so/saltstack/local/pillar/global.sls. That's what we'll discuss in this section. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. (Archived 1/22) Tuning NIDS Rules in Security Onion Security Onion 7.5K subscribers 48 Dislike Share 1,465 views Dec 22, 2021 This video has been archived as of January 2022 - the latest. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. In a distributed deployment, the manager node controls all other nodes via salt. 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,. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). Beta Hi @Trash-P4nda , I've just updated the documentation to be clearer. Custom rules can be added to the local.rules file Rule threshold entries can . In the image below, we can see how we define some rules for an eval node. Also ensure you run rule-update on the machine. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. jq; so-allow; so-elastic-auth; so . 137 vi local.rules 138 sudo vi local.rules 139 vi cd .. 140 cd .. 141 vi securityonion.conf 142 sudo vi pulledpork/pulledpork.conf 143 sudo rule-update 144 history 145 vi rules/downloaded.rules 146 sudo vi local.rules 147 sudo vi rules/local.rules 160 sudo passwd david 161 sudo visudo 162 sudo vi rules/local.rules Tracking. Enter the following sample in a line at a time. 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. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. IPS Policy This directory stores the firewall rules specific to your grid. /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. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. /opt/so/saltstack/local/salt/idstools/local.rules, "GPL ATTACK_RESPONSE id check returned root 2", /opt/so/saltstack/local/salt/strelka/rules, /opt/so/saltstack/local/salt/strelka/rules/localrules, /opt/so/saltstack/local/salt/strelka/rules/, https://github.com/Neo23x0/signature-base. Was this translation helpful? After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. When you purchase products and services from us, you're helping to fund development of Security Onion! 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. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. Security Deposit Reliable Up to $5,000 Payments Higher rents as supported by comparable rents Higher Voucher Payment Standards (VPS) 10/1/2021 Signing Bonus 1 - Bedroom = $893 to $1,064 2 - Bedroom = $1,017 to $1,216 3 - Bedroom = $1,283 to $1,530 4 - Bedroom = $1,568 to $1,872 5 - Bedroom = $1,804 to $2,153 6 - Bedroom = $2,038 to . From the Command Line. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. 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. 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. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. 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. We've been teaching Security Onion classes and providing Professional Services since 2014. How are they parsed? Port groups are a way of grouping together ports similar to a firewall port/service alias. The durian (/ d r i n /, / dj r i n /) is the edible fruit of several tree species belonging to the genus Durio.There are 30 recognised Durio species, at least nine of which produce edible fruit. 1. 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. The easiest way to test that our NIDS is working as expected might be to simply access http://testmynids.org/uid/index.html from a machine that is being monitored by Security Onion. Escalate local privileges to root level. I have had issues with Sguil when working with a snapshot and have not found a fix yet.. On Monday, June 26, 2017 at 8:28:44 PM UTC+5:30, KennyWap wrote: security-onion+unsubscribe@googlegroups.com, https://groups.google.com/group/security-onion. If you built the rule correctly, then snort should be back up and running. 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. 41 - Network Segmentation, VLANs, and Subnets. Salt sls files are in YAML format. Data collection Examination The remainder of this section will cover the host firewall built into Security Onion. There are two directories that contain the yaml files for the firewall configuration. This first sub-section will discuss network firewalls outside of Security Onion. Next, run so-yara-update to pull down the rules. 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 After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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). You may want to bump the SID into the 90,000,000 range and set the revision to 1. In this file, the idstools section has a modify sub-section where you can add your modifications. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. Adding local rules in Security Onion is a rather straightforward process. Backing up current downloaded.rules file before it gets overwritten. sigs.securityonion.net (Signature files for Security Onion containers) ghcr.io (Container downloads) rules.emergingthreatspro.com (Emerging Threats IDS rules) rules.emergingthreats.net (Emerging Threats IDS open rules) www.snort.org (Paid Snort Talos ruleset) github.com (Strelka and Sigma rules updates) Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. More information on each of these topics can be found in this section. These are the files that will need to be changed in order to customize nodes. Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. When I run sostat. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. 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. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). Now that the configuration is in place, you can either wait for the sensor to sync with Salt running on the manager, or you can force it to update its firewall by running the following from the manager: Add the required ports to the port group. Once your rules and alerts are under control, then check to see if you have packet loss. 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. 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. Add the following to the minions sls file located at. Files here should not be modified as changes would be lost during a code update. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. 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.
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