security onion local rules security onion local rules

When I run sostat. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. Home About Us Bill Pay 877-213-8180 Product Library My accountItems of interest (0) Get your campus card Your campus card allows you to borrow books from the Library, use services at the student centre, make payments at Macquarie University retail outlets, and identify yourself during class tests and . Set anywhere from 5 to 12 in the local_rules Kevin. In this file, the idstools section has a modify sub-section where you can add your modifications. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. 5. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. For example: In some cases, you may not want to use the modify option above, but instead create a copy of the rule and disable the original. Copyright 2023 Start creating a file for your rule. 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. 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. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. 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. > To unsubscribe from this topic . Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Adding local rules in Security Onion is a rather straightforward process. Salt sls files are in YAML format. Adding local rules in Security Onion is a rather straightforward process. It's simple enough to run in small environments without many issues and allows advanced users to deploy distributed systems that can be used in network enterprise type environments. Security Onion has Snort built in and therefore runs in the same instance. Security Onion offers the following choices for rulesets to be used by Suricata. 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. Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. Revision 39f7be52. If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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. 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. This can be done in the minion pillar file if you want the delay for just that minion, or it can be done in the global.sls file if it should be applied to all minions. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. 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. There are many ways to achieve age regression, but the three primary methods are: Botox. The error can be ignored as it is not an indication of any issue with the minions. . 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. 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. /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. Full Name. Revision 39f7be52. By default, only the analyst hostgroup is allowed access to the nginx ports. Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. However, generating custom traffic to test the alert can sometimes be a challenge. More information on each of these topics can be found in this section. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. 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. 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. 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. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. Backing up current local_rules.xml file. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. 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). As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. . For more information, please see: # alert ip any any -> any any (msg:"GPL ATTACK_RESPONSE id check returned root"; content:"uid=0|28|root|29|"; classtype:bad-unknown; sid:2100498; rev:7; metadata:created_at 2010_09_23, updated_at 2010_09_23;), /opt/so/saltstack/local/pillar/minions/_.sls, "GPL ATTACK_RESPONSE id check returned root test", /opt/so/saltstack/default/pillar/thresholding/pillar.usage, /opt/so/saltstack/default/pillar/thresholding/pillar.example, /opt/so/saltstack/local/pillar/global.sls, /opt/so/saltstack/local/pillar/minions/.sls, https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html, https://redmine.openinfosecfoundation.org/issues/4377, https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. It is now read-only. 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. 3. Cannot retrieve contributors at this time. 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. Saltstack states are used to ensure the state of objects on a minion. 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. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. All node types are added to the minion host group to allow Salt communication. Generate some traffic to trigger the alert. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. 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 Once your rules and alerts are under control, then check to see if you have packet loss. 2. 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! Escalate local privileges to root level. 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. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. Write your rule, see Rules Format and save it. 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. 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. 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. 1. 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. 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. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. Run rule-update (this will merge local.rules into downloaded.rules, update. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. Enter the following sample in a line at a time. According to NIST, which step in the digital forensics process involves drawing conclusions from data? This directory stores the firewall rules specific to your grid. Revision 39f7be52. For example, suppose we want to disable SID 2100498. Are you sure you want to create this branch? . . You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. 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. Let's add a simple rule that will alert on the detection of a string in a tcp session: Run rule-update (this will merge local.rules into downloaded.rules, update sid-msg.map, and restart processes as necessary): If you built the rule correctly, then Snort/Suricata should be back up and running. 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. We offer both training and support for Security Onion. A. All the following will need to be run from the 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. Adding Your Own Rules . If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Logs. You signed in with another tab or window. and dont forget that the end is a semicolon and not a colon. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Any definitions made here will override anything defined in other pillar files, including global. Interested in discussing how our products and services can help your organization? For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. 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. How are they stored? Tried as per your syntax, but still issue persists. > > > > > > > > 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. 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. 41 - Network Segmentation, VLANs, and Subnets. If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. Naming convention: The collection of server processes has a server name separate from the hostname of the box. These policy types can be found in /etc/nsm/rules/downloaded.rules. 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. 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. However, generating custom traffic to test the alert can sometimes be a challenge. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Find Age Regression Discord servers and make new friends! 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. Any pointers would be appreciated. to security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. 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. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. ELSA? Boot the ISO and run through the installer. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. . 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. You may want to bump the SID into the 90,000,000 range and set the revision to 1. This writeup contains a listing of important Security Onion files and directories. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. 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. These non-manager nodes are referred to as salt minions. This will add the host group to, Add the desired IPs to the host group. Do you see these alerts in Squert or ELSA? Copyright 2023 This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion.