![]() ![]() sudo add-apt-repository "deb xenial main".Since there’s no installable package in the official Ubuntu repository, you’ll have to add the project’s official Ubuntu repository to the system. You can install osquery by compiling it from source, or by using the package manager. Step 1 – Installing osquery on the Server You should also have a basic understanding of SQL and a fundamental knowledge of Linux system security. Follow the Initial Setup Guide for Ubuntu 16.04 to set this up. An Ubuntu 16.04 server, configured with a non-root user with sudo privileges and a firewall.To complete this tutorial, you’ll need to have the following in place: This tutorial will not cover that configuration, but you’ll learn how to configure and run the daemon and save results locally. Logs generated by osqueryd, the daemon, are intended to be shipped off to external logging endpoints that require additional expertise to set up and use properly. Start the daemon so that it can run queries automatically.Perform ad-hoc queries using osqueryi to look for security issues.Work with osquery packs, which are groups of predefined queries you can add to a schedule.Set up a configuration file that can be used by both osqueryi and osqueryd.Configure aspects of the operating system, like Rsyslog, that osquery needs to function properly.Most of the flags and options needed to run each are the same, and you can launch osqueryi using osqueryd’s configuration file so you can customize the environment without using lots of command-line switches. They don’t communicate, and you can use one without the other. Osqueryi and osqueryd are independent tools. It can also be used instead of the operating system’s service manager to start/stop/restart osqueryd. osqueryctl: A helper script for testing a deployment or configuration of osquery.osqueryd: A daemon for scheduling and running queries in the background.osqueryi: The interactive osquery shell, for performing ad-hoc queries.Installing osquery gives you access to the following components: If this appeals to you, you’ll love using osquery as a system security monitoring and intrusion detection tool for your server. | type | user | tty | host | time | pid | If we use a regular JOIN it is possible that reordering could result in the original error being encountered (because the chrome_extensions table generates with no uid in its context).Output+-+-+-+-+-+-+ Note: It is important to use CROSS JOIN as this tells the query optimizer not to reorder the evaluation of the tables. Writing the query with this JOIN ensures that osquery first generates the list of users, and then provides the user uids to the chrome_extensions table when generating that data. Typically this is achieved by a JOIN against the users table to retrieve data for every user on the system: SELECT uid, name FROM users CROSS JOIN chrome_extensions USING (uid) Show osquery which users to retrieve the data for. A query running as root does not know which directories to check. When run as a normal user, the implementations know to look in paths relative to the user’s home directories. This same issue manifests on many tables that include a uid column:Īs stated in the error message, these tables return “data based on the current user by default”. Our query runs as expected when osqueryi is run as a normal user, but returns a warning message and no results when run as root via sudo osqueryi. Need help, type '.help' osquery> SELECT uid, name FROM chrome_extensions LIMIT 3 W0519 09:35:27.624747 415233472 virtual_table.cpp:959] The chrome_extensions table returns data based on the current user by default, consider JOINing against the users table W0519 09:35:27.625207 415233472 virtual_table.cpp:974] Please see the table documentation: Need help, type '.help' osquery> SELECT uid, name FROM chrome_extensions LIMIT 3 +-+-+ | uid | name | +-+-+ | 501 | Slides | | 501 | Docs | | 501 | 1Password extension (desktop app required) | +-+-+ osquery> $ sudo osqueryi Using a virtual database. ![]() Many an osquery user has encountered a situation like the following: $ osqueryi Using a virtual database. ![]()
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