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. In the image below, we can see how we define some rules for an eval node. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. "; reference: url,http://holisticinfosec.blogspot.com/2011/12/choose-2011-toolsmith-tool-of-year.html; content: "toolsmith"; flow:to_server; nocase; sid:9000547; metadata:policy security-ips; rev:1). The reason I have a hub and not a switch is so that all traffic is forwarded to every device connected to it so security onion can see the traffic sent from the attacking kali linux machine, to the windows machines. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. Enter the following sample in a line at a time. Revision 39f7be52. All node types are added to the minion host group to allow Salt communication. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. 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. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. Data collection Examination 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. In this file, the idstools section has a modify sub-section where you can add your modifications. 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. Also ensure you run rule-update on the machine. If you built the rule correctly, then snort should be back up and running. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) However, generating custom traffic to test the alert can sometimes be a challenge. We created and maintain Security Onion, so we know it better than anybody else. This first sub-section will discuss network firewalls outside of Security Onion. You can use salts test.ping to verify that all your nodes are up: Similarly, you can use salts cmd.run to execute a command on all your nodes at once. Taiwan, officially the Republic of China (ROC), is a country in East Asia.It is located at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the northeast, and the Philippines to the south. All the following will need to be run from the manager. ELSA? For more information about Salt, please see https://docs.saltstack.com/en/latest/. This is located at /opt/so/saltstack/local/pillar/minions/.sls. In a distributed deployment, the manager node controls all other nodes via salt. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. Backing up current local_rules.xml file. Security Onion is a platform that allows you to monitor your network for security alerts. /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. All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. 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). 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. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. /opt/so/saltstack/local/salt/firewall/hostgroups.local.yaml is where many default named hostgroups get populated with IPs that are specific to your environment. 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. 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. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. Logs . This directory contains the default firewall rules. 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 Revision 39f7be52. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. At those times, it can be useful to query the database from the commandline. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. Copyright 2023 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) These non-manager nodes are referred to as salt minions. 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. Please update your bookmarks. 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. . See above for suppress examples. 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 . In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. 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. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. Hi @Trash-P4nda , I've just updated the documentation to be clearer. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. 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 a free and open platform for intrusion detection, enterprise security monitoring, and log management. 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. Copyright 2023 You could try testing a rule . This writeup contains a listing of important Security Onion files and directories. This directory stores the firewall rules specific to your grid. Any line beginning with "#" can be ignored as it is a comment. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. 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. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. 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. Previously, in the case of an exception, the code would just pass. The next run of idstools should then merge /opt/so/rules/nids/local.rules into /opt/so/rules/nids/all.rules which is what Suricata reads from. 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. If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. You received this message because you are subscribed to the Google Groups "security-onion" group. Salt minions must be able to connect to the manager node on ports, /opt/so/saltstack/local/pillar/global.sls, /opt/so/saltstack/local/pillar/minions/.sls, https://docs.saltproject.io/en/getstarted/system/communication.html, https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. How are they stored? There are many ways to achieve age regression, but the three primary methods are: Botox. These policy types can be found in /etc/nsm/rules/downloaded.rules. We've been teaching Security Onion classes and providing Professional Services since 2014. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. in Sguil? Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. /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. Escalate local privileges to root level. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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. 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. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. Please note! Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert 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, Durio zibethinus, native to Borneo and Sumatra, is the only species available in the international market.It has over 300 named varieties in Thailand and 100 in Malaysia, as of 1987. You can learn more about snort and writing snort signatures from the Snort Manual. Once logs are generated by network sniffing processes or endpoints, where do they go? In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. 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 Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. If . Adding local rules in Security Onion is a rather straightforward process. Revision 39f7be52. 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. so-rule allows you to disable, enable, or modify NIDS rules. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. By default, only the analyst hostgroup is allowed access to the nginx ports. Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. When you purchase products and services from us, you're helping to fund development of Security Onion! Salt is a core component of Security Onion 2 as it manages all processes on all nodes. 3. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. If so, then tune the number of AF-PACKET workers for sniffing processes. 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. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: 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. Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. Started by Doug Burks, and first released in 2009, Security Onion has. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. 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. These are the files that will need to be changed in order to customize nodes. For example, suppose we want to disable SID 2100498. and dont forget that the end is a semicolon and not a colon. 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. A node that has a port group and host group association assigned to it will allow those hosts to connect to those ports on that node. The server is also responsible for ruleset management. 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. jq; so-allow; so-elastic-auth; so . That's what we'll discuss in this section. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. Backing up current downloaded.rules file before it gets overwritten. 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.
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