7.2. This directory stores the firewall rules specific to your grid. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. To unsubscribe from this group and stop receiving emails from it, send an email to. Answered by weslambert on Dec 15, 2021. 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. 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). . PFA local.rules. Revision 39f7be52. 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 signed in with another tab or window. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: The remainder of this section will cover the host firewall built into Security Onion. Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert Finally, run so-strelka-restart to allow Strelka to pull in the new rules. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). The server is also responsible for ruleset management. When editing these files, please be very careful to respect YAML syntax, especially whitespace. 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. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. This is an advanced case and you most likely wont never need to modify these files. Open /etc/nsm/rules/local.rules using your favorite text editor. Enter the following sample in a line at a time. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. 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. 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. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. 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. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. These non-manager nodes are referred to as salt minions. For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . ET Open optimized for Suricata, but available for Snort as well free For more information, see: https://rules.emergingthreats.net/open/ ET Pro (Proofpoint) optimized for Suricata, but available for Snort as well rules retrievable as released If you built the rule correctly, then snort should be back up and running. Any definitions made here will override anything defined in other pillar files, including global. If you have Internet access and want to have so-yara-update pull YARA rules from a remote Github repo, copy /opt/so/saltstack/local/salt/strelka/rules/, and modify repos.txt to include the repo URL (one per line). 3. MISP Rules. 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. Backing up current local_rules.xml file. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. =========================================================================Top 50 All time Sguil Events=========================================================================Totals GenID:SigID Signature1686 1:1000003 UDP Testing Rule646 1:1000001 ICMP Testing Rule2 1:2019512 ET POLICY Possible IP Check api.ipify.org1 1:2100498 GPL ATTACK_RESPONSE id check returned rootTotal2335, =========================================================================Last update=========================================================================. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. Tried as per your syntax, but still issue persists. 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. 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! /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. It . 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. In a distributed deployment, the manager node controls all other nodes via salt. 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 Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. You can learn more about snort and writing snort signatures from the Snort Manual. Give feedback. 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. Any pointers would be appreciated. Backing up current downloaded.rules file before it gets overwritten. This error now occurs in the log due to a change in the exception handling within Salts event module. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. . 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. There isnt much in here other than anywhere, dockernet, localhost and self. /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. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. 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. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. You may want to bump the SID into the 90,000,000 range and set the revision to 1. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. Have you tried something like this, in case you are not getting traffic to $HOME_NET? (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. This is located at /opt/so/saltstack/local/pillar/minions/.sls. This repository has been archived by the owner on Apr 16, 2021. A. 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. 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. 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 . If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. Cannot retrieve contributors at this time. Salt sls files are in YAML format. > > => I do not know how to do your guilde line. If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. Full Name. Copyright 2023 Some node types get their IP assigned to multiple host groups. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. Once logs are generated by network sniffing processes or endpoints, where do they go? 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). Copyright 2023 For example, suppose we want to disable SID 2100498. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Escalate local privileges to root level. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. And when I check, there are no rules there. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). 1. 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. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. 5. 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. Salt sls files are in YAML format. > > > > > > > > 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. The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . How are they stored? You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. 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. However, generating custom traffic to test the alert can sometimes be a challenge. We can start by listing any currently disabled rules: Once that completes, we can then verify that 2100498 is now disabled with so-rule disabled list: Finally, we can check that 2100498 is commented out in /opt/so/rules/nids/all.rules: If you cant run so-rule, then you can modify configuration manually. Run the following command to get a listing of categories and the number of rules in each: In tuning your sensor, you must first understand whether or not taking corrective actions on this signature will lower your overall security stance. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. At those times, it can be useful to query the database from the commandline. This first sub-section will discuss network firewalls outside of Security Onion. To get the best performance out of Security Onion, youll want to tune it for your environment. This writeup contains a listing of important Security Onion files and directories. 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. Add the following to the sensor minion pillar file located at. Security. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. so-rule allows you to disable, enable, or modify NIDS rules. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. 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 Ingest. Of course, the target IP address will most likely be different in your environment: destination d_tcp { tcp("192.168.3.136" port(514)); }; log { After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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. 1. 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. Adding Your Own Rules . If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. For example, the following threshold IP exceeds the 64-character limit: This results in the following error in the Suricata log: The solution is to break the ip field into multiple entries like this: A suppression rule allows you to make some finer grained decisions about certain rules without the onus of rewriting them. Logs . 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. Identification. How are they parsed? On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? 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. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. Revision 39f7be52. Copyright 2023 Also ensure you run rule-update on the machine. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. This will add the host group to, Add the desired IPs to the host group. Copyright 2023 For more information about Salt, please see https://docs.saltstack.com/en/latest/. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips.