Lession1 Linux Preview
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The document discusses Linux file systems and permissions. It describes the Virtual File System (VFS) interface and how it interacts with filesystems, inodes, and open files. It then discusses the EXT2 filesystem in more detail, describing how inodes store file metadata and how hard and soft links work. It also covers common Linux permissions and how to manage users, groups, and permissions using commands like chmod, chown, useradd, and others.
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File Input/output, Database Access, Data Analysis with Pandas
The presentation starts with File Input and Output. Then the concepts of Database Access is detailed. Atlast the concepts data analysis with Pandas is covered
QSpiders - Unix Operating Systems and Commands
Operating System
Resources
Unix Architecture
Unix File Attributes
File Handling commands
Basic Regular Expression
Extended Regular Expression
Searching for a pattern in UINIX
Basics of Linux
This document provides an overview of the basics of Linux, including Linux distributions, components other than the kernel, popular distributions, getting connected via command line and SSH, common directories, the shell, command line vs GUI, basic commands, file permissions, and copying/moving files. It discusses key topics like the Linux kernel, distributions, directories, shells, commands, permissions, and file operations.
Basic Linux day 2
The document provides information on basic Linux commands for working with files, permissions, users and running levels. Some key points:
- Commands like ls, du, df, free are used to view disk usage, files, permissions and available memory. chmod, chown, chgrp change file/folder permissions and ownership.
- Permissions are represented by rwx for read, write and execute for the user, group and others. Numerical values like 755 can set complex permission schemes.
- Linux has 7 run levels from 0-6 for different system states like shutdown, single-user mode, multi-user with networking. Services are started via links in run level directories.
- Common commands
Linux Security
Linux originally released in 1991 for personal computers, has since met ever increasing popularity.
4_Users_and_File_Permission_and_Directory_Commands
This document provides an overview of Unix users and file permissions. It discusses the different types of users in Unix including root, system, and general users. It also covers file permissions in terms of ownership levels, permission types, and how to change permissions using the chmod command in both symbolic and octal modes. Examples are provided for managing users and groups as well as setting permissions on files and directories. The document contains content for a training course on Unix users and file permissions.
File Access Permission
The document discusses file access permissions in Linux operating systems. It explains that there are three types of permissions - read, write and execute - that can be assigned to a file's owner, group and others. These permissions determine who can access the file and what actions they can take. The ls -l command displays the permissions in the form of 10 characters that show the file type and permissions for each user category. The chmod command can be used to change these permissions using either absolute numeric modes or symbolic modes.
Host security
Host security measures aim to comprehensively protect individual hosts through host-centric approaches tailored to the host's architecture and configuration. This involves securing configurations, access controls, permissions and services on Unix-like systems. Common weaknesses include password issues, exploitable services and improper permissions. Unix uses users, groups and world permissions on files and directories to control access. Proper configuration of these permissions and use of setuid programs is important for security. The Unix password system has evolved from storing passwords in plaintext to using shadow files and stronger encryption.
Host security
Host security measures aim to comprehensively protect individual hosts through host-centric approaches tailored to the host's architecture and configuration. This involves securing configurations, access controls, permissions and services on Unix-like systems. Common weaknesses include password issues, exploitable services and improper permissions. Unix uses users, groups and world permissions on files and directories to control access. Sensitive system directories must have proper permissions to balance security and usability. Remote access utilities like rlogin pose risks if not properly configured, so disabling them in favor of SSH is recommended. The Unix password system has evolved from insecure early implementations to more secure modern schemes that hash passwords and store them separately from account details.
40 basic linux command
The document provides 40 tips for using basic Linux command line commands and tricks. Some key points include: everything in Linux is a file; # and $ denote superuser and normal users respectively; Ctrl+Alt+F1-F6 switch between terminals while Ctrl+Alt+F7 switches to the GUI; tilde ~ denotes the user's home directory; hidden files start with dot; ls -a views hidden files; file permissions use rwx scheme; and variables can store long text for repeated use.
Operating System Practice : Meeting 4 - operasi file dan struktur direktori-s...
This document discusses file operations and directory structure in Linux operating systems. It describes the hierarchical tree structure of the Linux file system with the root directory at the top. It also defines standard directories like /bin, /etc, and /home and explains directory descriptions. The document outlines file types, properties, naming conventions, and symbolic links. It provides examples of commands to view file contents and search files.
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File Input/output, Database Access, Data Analysis with Pandas
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4_Users_and_File_Permission_and_Directory_Commands
4_Users_and_File_Permission_and_Directory_Commands
Operating System Practice : Meeting 4 - operasi file dan struktur direktori-s...
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Dns
The document discusses the Domain Name System (DNS) and how it works. It explains that DNS associates domain names with IP addresses, allowing hosts to connect using names instead of hard-to-remember numbers. DNS uses a hierarchical system of servers, including root servers, TLD servers, and authoritative name servers that manage domain records and refer queries to other servers as needed to resolve domain names to IP addresses.
Lession4 Dhcp
DHCP is a protocol that automatically assigns IP addresses and other network configuration settings to clients. It allows administrators to change network settings centrally on the DHCP server rather than having to configure each client individually. The DHCP server stores lease information in /var/lib/dhcp/dhcpd.leases and is configured using /etc/dhcpd.conf which defines IP pools, default routes, DNS servers and other options. The DHCP relay agent forwards requests from clients without a local DHCP server to servers on other subnets.
Lession3 Routing
This document summarizes basic Linux routing concepts including enabling IP forwarding, configuring routing tables, displaying routing and ARP tables, and examples of routing rules. Key points are:
1) IP forwarding can be enabled by editing /etc/sysctl.conf or /proc/sys/net/ipv4/ip_forward.
2) The routing table contains rules with destination, interface, and optional gateway to route packets.
3) Example commands demonstrate adding routing rules for different networks through specific interfaces.
Module 1 Introduction
Phase 1 involves reconnaissance where the hacker gathers information about the target without directly interacting with it. Phase 2 is scanning where the hacker scans the network to find specific information like open ports and operating systems. Phase 3 is gaining access where the hacker exploits a vulnerability to penetrate the system. Phase 4 is maintaining access where the hacker tries to retain ownership and may install backdoors. Phase 5 is covering tracks where the hacker hides evidence of the attack.
Net Security Intro
The document outlines a 15-module network security course taught by Phạm Văn Tính, PhD. The course covers ethical hacking theory over 45 hours and practice over 30 hours. Topics include footprinting, scanning, enumeration, system hacking, trojans, sniffers, denial of service attacks, social engineering, session hijacking, hacking web servers, SQL injection, wireless hacking, Linux hacking, and evading intrusion detection systems. The course material is based on CEH curriculums and references four literature sources on ethical hacking, Linux/Unix security, network security secrets and solutions, and web security.
Module 10 Physical Security
Physical security involves preventing unauthorized access to computer systems and protecting data. It includes securing the company surroundings with fences, gates, and guards. Within premises, CCTV cameras, intruder alarms, and window/door bars provide security. Servers should be locked in enclosed rooms, and workstations in open areas need locks and CCTV monitoring. Access controls like smart cards, biometrics, and entry logs restrict access to sensitive areas. Wireless networks and other equipment also require security measures like encryption and locked storage to protect physical integrity of systems and data.
Module 9 Dos
The document discusses denial of service (DoS) and distributed denial of service (DDoS) attacks. It defines DoS and DDoS attacks, describes different types of DoS attacks like SYN flooding and Smurf attacks. It also explains how botnets and tools are used to launch DDoS attacks, and discusses some common DDoS countermeasures like detection, mitigation and traceback.
Module 8 System Hacking
The document discusses various techniques for hacking systems, including password cracking, privilege escalation, executing applications remotely, and using keyloggers and spyware. It provides an overview of tools that can perform functions like password cracking, sniffing network traffic, capturing credentials, escalating privileges, executing code remotely, and logging keystrokes covertly. Countermeasures to these techniques, like disabling LM hashes, changing passwords regularly, and using antivirus software, are also covered.
Module 6 Session Hijacking
Session hijacking involves an attacker taking over an existing TCP connection between two machines by predicting sequence numbers and spoofing IP addresses. The document discusses the difference between spoofing and hijacking, the steps an attacker takes to hijack a session including predicting sequence numbers and killing the original connection, types of session hijacking techniques, and tools that can be used for session hijacking like Juggernaut, Hunt, IP Watcher, and T-Sight. It also provides countermeasures like using encryption, secure protocols, limiting connections, and educating employees.
Module 5 Sniffers
This document provides an overview of network sniffing including definitions, vulnerable protocols, types of sniffing attacks, tools used for sniffing, and countermeasures. It discusses passive and active sniffing, ARP spoofing, MAC flooding, DNS poisoning techniques, and popular sniffing tools like Wireshark, Arpspoof, and Dsniff. It also outlines methods for detecting sniffing activity on a network such as monitoring for changed MAC addresses and unusual packets, as well as recommendations for implementing countermeasures like encryption, static ARP tables, port security, and intrusion detection systems.
Module 4 Enumeration
The document discusses techniques for enumerating information from systems during the hacking process. It describes establishing null sessions to extract user names, shares, and other details without authentication. Tools like DumpSec, Netview, Nbtstat, GetAcct, and PS Tools are also covered as ways to enumerate users, groups, shares, permissions, and more from Windows and UNIX systems. The document also provides countermeasures like restricting null sessions and the anonymous user to protect against enumeration attacks.
Module 3 Scanning
The document discusses scanning techniques used during penetration testing and hacking. It defines different types of scanning like port scanning, network scanning, and vulnerability scanning. It describes tools like Nmap that can be used to perform these scans and examines techniques like SYN scanning, XMAS scanning, NULL scanning, and IDLE scanning. The document also discusses using proxies and anonymizers to hide one's location while scanning and ways to document results like creating network diagrams of vulnerable systems.
Module 2 Foot Printing
The document provides an overview of footprinting, which is the first stage of reconnaissance during a cyber attack. It involves gathering open-source information about a target organization to understand its security profile and map its network. Some of the tools mentioned for footprinting include Whois, Nslookup, traceroute, Google Earth and various online databases to find domain information, network details, employee names and more. The goal is to learn as much as possible about the target before launching an actual attack.
Call Back
The document discusses using remote method invocation (RMI) in Java to implement callbacks. It describes defining a listener interface that other classes can implement to be notified of events. An event source interface is defined to allow listeners to register and receive notifications. The event source is implemented as an RMI server that notifies all registered listeners when temperature changes. A client implements the listener interface and registers with the server to receive remote callbacks of temperature changes.
Module 1 Introduction
The document discusses how to implement callbacks in Java RMI using remote method invocation. It describes defining a listener interface and event source interface, implementing the event source to notify listeners, implementing a listener client, and registering the listener with the event source. It provides code examples for implementing the event source and listener interfaces, starting the event source server, and having the listener client look up and register with the event source.
Call Back
The document discusses how to implement callbacks in Java RMI using remote method invocation. It describes defining a listener interface and event source interface, implementing the event source to notify listeners, implementing a listener client, and registering the listener with the event source. It provides code examples for implementing the event source and listener interfaces, starting the event source server, and having the listener client look up and register with the event source.
Call Back
The document discusses how to implement callbacks in Java RMI using remote method invocation. It describes defining a listener interface and event source interface, implementing the event source to notify listeners, implementing a listener client, and registering the listener with the event source. It provides code examples for implementing and registering both the event source and listener.
Url Connection
The document discusses how to retrieve and process information from remote URLs using the URL and URLConnection classes in Java. It provides examples of opening a URLConnection, reading response headers, and getting input streams to access the resource content. Key methods like openConnection(), getInputStream(), getHeaderFields() are explained.
Udp Programming
The document provides an overview of UDP programming in Java. It discusses how UDP can be more efficient than TCP for small, frequent data transfers with less overhead. It then covers creating and using DatagramPacket and DatagramSocket classes to send and receive UDP packets. Key points include initializing DatagramPacket with a byte buffer to store packet data, and using DatagramSocket's receive and send methods along with connect/disconnect for client/server functionality.
Socket Programming
The document discusses socket programming and networking basics. It provides three key points:
1) Computers communicate over the internet using either TCP or UDP. TCP provides reliable, connection-based communication while UDP provides best-effort datagram delivery.
2) Ports allow multiple applications to communicate simultaneously on the same machine. Well-known ports are associated with common network services like HTTP and FTP.
3) Sockets represent a connection between hosts and can perform operations like connecting, sending/receiving data, and closing connections. The Socket and ServerSocket classes in Java implement client-server socket programming.
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Mind map of terminologies used in context of Generative AI
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Lession1 Linux Preview
- 1. NETWORK ADMINISTRATION LINUX PREVIEW
- 4. I-Node and Data block in EXT2 FS
- 7. Directories in EXT2 FS Directories are implemented as a special type of files . Actually, a directory is a file containing a list of entries . Each entry contains an inode number and a file name .
- 11. Permissions The first item, which specifies the file type, can show one of the following: d : a directory - (dash) : a regular file (rather than directory or link) l : a symbolic link to another program or file Beyond the first item, in each of the following three sets, you will see one of the following: r : file can be read w : file can be written to x : file can be executed (if it is a program) - ( rw- ) ( rw- ) ( r-- ) 1 sam sam | | | | Type owner group others
- 42. Linux Networking
- 64. Managing Hosts
- 69. Activating Devices To verify that the alias has been activated, use the command ifconfig. The output should show the device and the device alias with different IP address