Tree's Notes
  • Overview
  • Tools & Cheatsheets
  • Hacking Methodology
  • Hands-on Practice
  • Linux
    • Linux Basics
  • Windows
    • Windows Basics
  • MacOS
    • MacOS Basics
  • Web
    • Web Basics
  • Mobile
    • iOS
    • Android
  • OS Agnostic
    • Template
  • Courses
    • Hack The Box
      • Bug Bounty Hunter
        • Module 1: Web Requests
        • Module 2: Introduction to Web Applications
        • Module 3: Using Web Proxies
        • Module 4: Information Gathering - Web Edition
        • Module 5: Attacking Web Applications with Ffuf
        • Module 6: JavaScript Deobfuscation
        • Module 7: Cross-Site Scripting (XSS)
        • Module 8: SQL Injection Fundamentals
        • Module 9: SQLMap Essentials
        • Module 10: Command Injections
        • Module 11: File Upload Attacks
        • Module 12: Server-Side Attacks
        • Module 13: Login Brute Forcing
        • Module 14: Broken Authentication
        • Module 15: Web Attacks
        • Module 16: File Inclusion
        • Module 17: Session Security
        • Module 18: Web Service & API Attacks
        • Module 19: Hacking Wordpress
        • Module 20: Bug Bounty Hunting Process
    • OffSec
      • 🦊EXP-301
        • Module 1: Windows User Mode Exploit Development: General Course Information
        • Module 2: WinDbg and x86 Architecture
        • Module 3: Exploiting Stack Overflows
        • Module 4: Exploiting SEH Overflows
        • Module 5: Introduction to IDA Pro
        • Module 6: Overcoming Space Restrictions: Egghunters
        • Module 7: Creating Custom Shellcode
        • Module 8: Reverse Engineering for Bugs
        • Module 9: Stack Overflows and DEP Bypass
        • Module 10: Stack Overflows and ASLR Bypass
        • Module 11: Format String Specifier Attack Part I
        • Module 12: Format String Specifier Attack Part II
        • Module 13: Trying Harder: The Labs
      • 🐙EXP-312
        • Module 1: macOS Control Bypasses: General Course Information
        • Module 2: Virtual Machine Setup Guide
        • Module 3: Introduction to macOS
        • Module 4: macOS Binary Analysis Tools
        • Module 5: The Art of Crafting Shellcodes
        • Module 6: The Art of Crafting Shellcodes (Apple Silicon Edition)
        • Module 7: Dylib Injection
        • Module 8: The Mach Microkernel
        • Module 9: XPC Attacks
        • Module 10: Function Hooking on macOS
        • Module 11: The macOS Sandbox
        • Module 12: Bypassing Transparency, Consent, and Control (Privacy)
        • Module 13: GateKeeper Internals
        • Module 14: Bypassing GateKeeper
        • Module 15: Symlink and Hardlink Attacks
        • Module 16: Injecting Code into Electron Applications
        • Module 17: Getting Kernel Code Execution
        • Module 18: Mach IPC Exploitation
        • Module 19: macOS Penetration Testing
        • Module 20: Chaining Exploits on macOS Ventura
        • Module 21: Mount(ain) of Bugs (archived)
      • ⚓IR-200
        • Module 1: Incident Response Overview
        • Module 2: Fundamentals of Incident Response
        • Module 3: Phases of Incident Response
        • Module 4: Incident Response Communication Plans
        • Module 5: Common Attack Techniques
        • Module 6: Incident Detection and Identification
        • Module 7: Initial Impact Assessment
        • Module 8: Digital Forensics for Incident Responders
        • Module 9: Incident Response Case Management
        • Module 10: Active Incident Containment
        • Module 11: Incident Eradication and Recovery
        • Module 12: Post-Mortem Reporting
        • Module 13: Incident Response Challenge Labs
      • 🐉PEN-103
      • 🐲PEN-200
        • Module 1: Copyright
        • Module 2: Penetration Testing with Kali Linux: General Course Information
        • Module 3: Introduction to Cybersecurity
        • Module 4: Effective Learning Strategies
        • Module 5: Report Writing for Penetration Testers
        • Module 6: Information Gathering
        • Module 7: Vulnerability Scanning
        • Module 8: Introduction to Web Application Attacks
        • Module 9: Common Web Application Attacks
        • Module 10: SQL Injection Attacks
        • Module 11: Client-side Attacks
        • Module 12: Locating Public Exploits
        • Module 13: Fixing Exploits
        • Module 14: Antivirus Evasion
        • Module 15: Password Attacks
        • Module 16: Windows Privilege Escalation
        • Module 17: Linux Privilege Escalation
        • Module 18: Port Redirection and SSH Tunneling
        • Module 19: Tunneling Through Deep Packet Inspection
        • Module 20: The Metasploit Framework
        • Module 21: Active Directory Introduction and Enumeration
        • Module 22: Attacking Active Directory Authentication
        • Module 23: Lateral Movement in Active Directory
        • Module 24: Enumerating AWS Cloud Infrastructure
        • Module 25: Attacking AWS Cloud Infrastructure
        • Module 26: Assembling the Pieces
        • Module 27: Trying Harder: The Challenge Labs
      • 🛜PEN-210
        • Module 1: IEEE 802.11
        • Module 2: Wireless Networks
        • Module 3: Wi-Fi Encryption
        • Module 4: Linux Wireless Tools, Drivers, and Stacks
        • Module 5: Wireshark Essentials
        • Module 6: Frames and Network Interaction
        • Module 7: Aircrack-ng Essentials
        • Module 8: Cracking Authentication Hashes
        • Module 9: Attacking WPS Networks
        • Module 10: Rogue Access Points
        • Module 11: Attacking Captive Portals
        • Module 12: Attacking WPA Enterprise
        • Module 13: bettercap Essentials
        • Module 14: Determining Chipsets and Drivers
        • Module 15: Kismet Essentials
        • Module 16: Manual Network Connections
      • 🔗PEN-300
        • Module 1: Evasion Techniques and Breaching Defenses: General Course Information
        • Module 2: Operating System and Programming Theory
        • Module 3: Client Side Code Execution With Office
        • Module 4: Phishing with Microsoft Office
        • Module 5: Client Side Code Execution With Windows Script Host
        • Module 6: Reflective PowerShell
        • Module 7: Process Injection and Migration
        • Module 8: Introduction to Antivirus Evasion
        • Module 9: Advanced Antivirus Evasion
        • Module 10: Application Whitelisting
        • Module 11: Bypassing Network Filters
        • Module 12: Linux Post-Exploitation
        • Module 13: Kiosk Breakouts
        • Module 14: Windows Credentials
        • Module 15: Windows Lateral Movement
        • Module 16: Linux Lateral Movement
        • Module 17: Microsoft SQL Attacks
        • Module 18: Active Directory Exploitation
        • Module 19: Attacking Active Directory
        • Module 20: Combining the Pieces
        • Module 21: Trying Harder: The Labs
      • ⚛️SEC-100
      • 🛡️SOC-200
        • Module 1: Introduction to SOC-200
        • Module 2: Attacker Methodology Introduction
        • Module 3: Windows Endpoint Introduction
        • Module 4: Windows Server Side Attacks
        • Module 5: Windows Client-Side Attacks
        • Module 6: Windows Privilege Escalation
        • Module 7: Windows Persistence
        • Module 8: Linux Endpoint Introduction
        • Module 9: Linux Server Side Attacks
        • Module 10: Linux Privilege Escalation
        • Module 11: Network Detections
        • Module 12: Antivirus Alerts and Evasion
        • Module 13: Active Directory Enumeration
        • Module 14: Network Evasion and Tunneling
        • Module 15: Windows Lateral Movement
        • Module 16: Active Directory Persistence
        • Module 17: SIEM Part One: Intro to ELK
        • Module 18: SIEM Part Two: Combining the Logs
        • Module 19: Trying Harder: The Labs
      • TH-200
        • Module 1: Threat Hunting Concepts and Practices
        • Module 2: Threat Actor Landscape Overview
        • Module 3: Communication and Reporting for Threat Hunters
        • Module 4: Hunting With Network Data
        • Module 5: Hunting on Endpoints
        • Module 6: Theat Hunting Without IoCs
        • Module 7: Threat Hunting Challenge Labs
      • 🦉WEB-200
        • Module 1: Introduction to WEB-200
        • Module 2: Tools (archived)
        • Module 3: Web Application Enumeration Methodology
        • Module 4: Introduction to Burp Suite
        • Module 5: Cross-Site Scripting Introduction and Discovery
        • Module 6: Cross-Site Scripting Exploitation and Case Study
        • Module 7: Cross-Origin Attacks
        • Module 8: Introduction to SQL
        • Module 9: SQL Injection
        • Module 10: Directory Traversal Attacks
        • Module 11: XML External Entities
        • Module 12: Server-side Template Injection - Discovery and Exploitation
        • Module 13: Command Injection
        • Module 14: Server-side Request Forgery
        • Module 15: Insecure Direct Object Referencing
        • Module 16: Assembling the Pieces: Web Application Assessment Breakdown
      • 🕷️WEB-300
        • Module 1: Introduction
        • Module 2: Tools & Methodologies
        • Module 3: ManageEngine Applications Manager AMUserResourcesSyncServlet SSQL Injection RCE
        • Module 4: DotNetNuke Cookie Deserialization RCE
        • Module 5: ERPNext Authentication Bypass and Remote Code Execution
        • Module 6: openCRX Authentication Bypass and Remote Code Execution
        • Module 7: openITCOCKPIT XSS and OS Command Injection - Blackbox
        • Module 8: Concord Authentication Bypass to RCE
        • Module 9: Server-Side Request Forgery
        • Module 10: Guacamole Lite Prototype Pollution
        • Module 11: Dolibarr Eval Filter Bypass RCE
        • Module 12: RudderStack SQLi and Coraza WAF Bypass
        • Module 13: Conclusion
        • Module 14: ATutor Authentication Bypass and RCE (archived)
        • Module 15: ATutor LMS Type Juggling Vulnerability (archived)
        • Module 16: Atmail Mail Server Appliance: from XSS to RCE (archived)
        • Module 17: Bassmaster NodeJS Arbitrary JavaScript Injection Vulnerability (archived)
    • SANS
      • FOR572
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On this page
  • Preseeding
  • Preseed Config
  • Overcoming limitations
  • Creating a Preseed File
  • Services
  • Postgresql
Edit on GitHub
  1. Linux

Linux Basics

Hack Responsibly.

Always ensure you have explicit permission to access any computer system before using any of the techniques contained in these documents. You accept full responsibility for your actions by applying any knowledge gained here.‌

Preseeding

You can pressed any installer question with boot parameters which are accessible through /proc/cmdline.

You can directly use the full identifier of the debconf questions, such as debian-installer/language=en, language=en, or hostname=kali

Preseed Config

File presence locations

  • Media

    • /cdrom/preseed.cfg

    • /hdmedia/preseed.cfg

  • Network

    • preseed/url=http://server/preseed.cfg

Overcoming limitations

To overcome the limitation of not being able to preseed the language, country, and keyboard questions, you can add the boot parameter auto-install/enable=true (or auto=true)

Creating a Preseed File

The simplest way to write a preseed file is to install a system by hand. Then the debconf-get-selections --installer command will provide the answers you provided. You can get answers directed to other packages with debconf-get-selections. The cleaner solution is to write the preseed file by hand, starting from an example and then going through the documentation. This way only questions where the default answer needs to be overwritten can be preseeded. Provide the priority=critical boot parameter to instruct Debconf to only ask critical questions, and to use default answers for others. Examples:

  • d-i mirror/suite string kali-rolling

Services

Postgresql

This service listens on port 5432 and on file-based socket /var/run/postgresql/.s.PGSQL.5432, additional clusters get assigned next available port number (usually 5433 for the second cluster). Configuration files are found in /etc/postgresql/version/cluster-name/. The postgres user is special and has full administrative privileges over all databases.

Creating Users and Databases

Each command acts on the default cluster, but you can pass --port=port to modify users/databases on an alternate cluster. createuser - adds a new user dropuser - removes a user createdb - adds a new database dropdb - removes a database

Example 1: creating a new user and database, then assigning the new user as the owner of the new database.

# su - postgres
postgres@kali:~$ creatuser -P king_phisher
postgres@kali:~$ createdb -T template0 -E UTF-8 -O king_phisher king_phisher
postgres@kali:~$ exit

Example 2: Test connecting to the database over the socket as king_phisher.

# psql -h localhost -U king_phisher king_phisher
king_phisher=>
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Last updated 9 months ago