...Paper 07/13/2012 Linux Security Technologies In today’s world there are many ways to gain access to the internet. You can go to your local library, a Starbucks, any airport, or even a McDonald’s. With all of these ways to have free access to the Web, the opportunity for hacker’s to get to your personal information is at an all time high. Linux programming has many ways to combat this situation with security technologies such as SELinux, chroot jail, iptables, and virtual private networks (VPN’s) to name a few. The basics of Linux security start with Discretionary Access Control, which is based by users and groups. The process starts with a user, who has access to anything that any other user can have access to. At first, it may seem great to be able to have that access, but the security in it is not so great. The US National Security Agency (NSA) developed the SELinux (Security Enhanced Linux) to combat the lack of strong security. (National Security Agency Central Security Service, 2009) Other organizations behind SELinux include the Network Associate Laboratories (NAI) labs which implemented several additional kernel mandatory access controls, developed the example security policy configuration, ported to the Linux 2.4 kernel, contributed to the development of the Linux Security Modules kernel patch, and adapted the SELinux prototype to LSM. The MITRE Corporation which enhanced several utilities to be SELinux-aware, and developed application security policies. And the...
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...With a world that is vastly growing in size so does our use for technology. With this use of technology come lots of potential threats and hazards. Our world today is ever so growing with its relationship with the internet or World Wide Web (WWW). Many places use the internet to access sites, software, music, book, and so forth, the list goes on. But with this advance in technology come lots of threats to consumers alike. Such as hackers, viruses, people who don’t know what they are doing, and even people who you may call your best friend. Threat comes in many shapes and sizes which is why operating systems such as Linux develop ways to keep your personal files safe from these unwarranted threats. Some of these measures include, but is not limited to; iptables, SELinux, chroot jail, TCP Wrappers, firewalls, PolicyKit, NX or No eXecute, PIE or Position Independent Executables, Netfilter, and the list goes on (“Fedora Projects” & Vepstas). When a user first approaches Linux it looks similar to what a windows operating system would resemble. With Linux a user has the ability to access every file within the operating system through the use of a terminal or command prompt. Through the use of Linux programming potential threats can gain access to you file system and everything housed within it. Linux is free software that comes with many great security features that any user or administrator greater access and control over the system. The choice can be a bit much for most...
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...|Linux Security Technology | | 1. SELinux SELinux, an implementation of Mandatory Access Control (MAC) in the Linux kernel, adds the ability to administratively define policies on all subjects (processes) and objects (devices, files, and signaled processes). This mechanism is in the Linux kernel, checking for allowed operations after standard Linux Discretionary Access Controls DAC are checked. Security-Enhanced Linux (SELinux) is a Linux feature that provides a mechanism for supporting access control security policies, including United States Department of Defense-style mandatory access controls, through the use of Linux Security Modules (LSM) in the Linux kernel. It is not a Linux distribution, but rather a set of Kernel modifications and user-space tools that can be added to various Linux distributions. Its architecture strives to separate enforcement of security decisions from the security policy itself and streamlines the volume of software charged with security policy enforcement. The key concepts underlying SELinux can be traced to several earlier projects by the United States National Security Agency (NSA), It has been integrated into the mainline Linux kernel since version 2.6. NSA, the original primary developer of SELinux, released the first version to the open source development community under the GNU GPL on December 22, 2000. Security-enhanced Linux...
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...different types of Linux Security Technologies. Discretionary Access Control, SELinux (Security Enhanced Linux), chroot jail, and iptables are just a few. This paper is only going to discuss the latter three. Discretionary Access Control is the more traditional, however; DAC is not as secure and will not be discussed here.1 The U.S National Security Agency (NSA) is the organization behind the creation of SELinux. The reason the NSA is involved in this project is because this organization is responsible for carrying out the research and advanced development of technologies needed to enable NSA to provide the solutions, products, and services to achieve Information Assurance for information infrastructures critical to U.S. National Security interests. The NSA implemented a Mandatory Access control within the Linux Kernel. This MAC is named Flask.2 There are three main policies that SELinux uses to apply MAC. There is the Targeted, where the MAC controls will only be used for a specific process or processes, there is the Multilevel Security protection, and the Strict. The strict puts MAC controls to all processes. The targeted is not as secure as the strict, however; the targeted is easier to maintain. If one uses the strict, the administrator will have to customize the policy. Failure to do so could cause other users a significant problem in performing his or her assigned duties. 3 The main reason the MAC has been created is to help prevent security threats to...
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...Linux Security Technologies SELinux (Security Enhanced Linux) is a mandatory access control in the Linux kernel that was originally developed by NSA (National Security Agency) with direct contributions provided by Red Hat Enterprise Linux (RHEL) via the Fedora Project. In the day and age of identity theft and attempted sabotage from terrorists against our country, it should be very apparent why an organization like NSA had such an interest in heading up development of a more secure way to better protect our nation’s computer systems. In a world so largely dependent on computer systems, inadequate security measures could lead to anything from having a single person’s financial information compromised to an electronic 9/11 against some of our country’s most secure federal computer networks. In the modern computer based society we live in, security is essential to protecting everything from personal desktops all the way up to the most secure federal databases. And many corporate and government level computers are based on the Linux kernel. SELinux has 3 states it can be in if on a system: Enabled, Disabled, and Permissive. Enforcing means SELinux security policy is active, Disabled means SELinux security policy is not active, and Permissive is a diagnostic state commonly used for troubleshooting. To better understand what improvements Mandatory Access Control (MAC) can provide for security, one needs to know about the standard Linux security provision called Discretionary...
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...critical research problem. Linux has several security developments included in its open source operating system. Among these are SELinux, chroot jail, and iptables to name a few. SELinux is Security Enhanced Linux. The National Information Assurance Research Laboratory of the National Security Agency was in charge of carrying out the research and advanced development of technologies needed to enable the NSA to provide the solutions, products, and services to achieve Information Assurance for information infrastructures essential to the security of the U.S. National Security. The Security-enhanced Linux prototype was developed by the NSA along with research partners from NAI Labs, Secure Computing Corporation (SCC), and the MITRE Corporation. Many other contributions have followed since the initial release.(NSA-National Security Agency, 2009) Researchers in the National Information Assurance Research Laboratory of NSA worked with Secure Computing Corporation (SCC) to develop a strong, flexible mandatory access control architecture based on a mechanism first developed for the LOCK system called Type Enforcement. The NSA and SCC then worked with the University of Utah’s Flux research group to transfer the architecture to the Fluke research operating system. The architecture was enhanced, when it was transferred, to provide better support for dynamic security policies. This enhanced architecture was named Flask. SELinux implements the Flask security architecture which uses flexible...
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...Research Assignment Linux Security Technologies Kristy Graves ITT Tech – Dayton Linux II IT302 Mandatory Access Control Mandatory Access Control (MAC) is a system wide policy that relies on the current system to control access (Syracuse University, 2009). Users cannot alter or make any changes to this policy. Only the administrator has the clearance and authorization to make changes (The Computer Language Company Inc., 2012). Mandatory access control mechanisms are more than Discretionary Access Control (DAC) but have trade offs in performance and convenience to all users (The Open Web Application Security Project, 2002). Users can access lower level documentation, but they cannot access higher level without the process of declassification. Access is authorized or restricted based on the security characteristics of the HTTP client. This can be due to SSL bit length, version information, originating IP address or domain, etc. Systems supporting flexible security models can be SELinux, Trusted Solaris, TrustedBSD, etc. DAC checks the validity of the credentials given by the user. MAC validate aspects which are out of the hands of the user (Coar, 2000). If there is no DAC list on an object, full access is granted to any user (Microsoft, 2012). SELinux SELinux has three states of operation. These states are enforcing, permissive, and disabled. SELinux was developed by the U.S. National Security Agency (NSA) and implements MAC in a Linux kernel (Sobell, 2011). Enforcing...
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...Linux Security Technology Security of a system is important in our today’s use of the internet. That is why Linux with its many layers that are always evolving in security to protect against all kinds of hackers or othe types of attacks . SELinux, Chroot Jail, IPTables, Mandatory Access Control and Discrestionary Access Control, just to name a few. SELinux is an access control implementation for the Linux kernel. Take for instants that you are the administrator and you define rules in user space and if the Linux kernel has been added with SELinux support, then those rules will be followed by the kernel. SELinux is a NSA Security-Enhanced Linux, in which the mandatory access control is flexible. The structure of SELinux supports against all kinds of mandatory access control policies. Some of which are Role-Based Access Control and Multi-Level Security. It was designed by NSA for the purpose of protecting a server against malicious daemons, by telling the daemons what they can and can’t do. This type of technology was created by Secure Computing Corporation, but was supported by the U.S. National Security Agency. In 1992, the thought for a more intense security system was needed and a project called Distributed Trusted Match was created. Some good solutions evolved from this, some of which were a part of the Fluke operating system. Which then became the Flux and finally led to the creation of the Flask architecture. Eventually it was combined with the Linux kernel, which...
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...Assignment 1 IT 302 Linux System Administration January 21, 2013 The purpose of this paper is to secure UNIX/Linux operating systems from unscrupulous people. It shall be focused on SELinux, chroot jail, and iptables. Each of the three focus areas will be detailed, with specific interest in the following. What organization is behind it and reason entity is involved. How each technology changes the operating system to enforce security, and if the security measure can be easily bypassed. And finally, describe the types of threats each of the technologies is designed to eliminate. Since no two UNIX-based operating system builds are exactly alike, it is important to note that each build may have its own inherent security flaws. SELinux was developed by The United States National Security Agency (NSA). The first version was made available to the open source development community under the GNU GPL on December 22, 2000. The software merged into the mainline Linux kernel 2.6.0-test3, released on 8 August 2003. Other significant contributors include Network Associates, Red Hat, Secure Computing Corporation, Tresys Technology, and Trusted Computer Solutions. Experimental ports of the FLASK/TE implementation have been made available via the TrustedBSD Project for the FreeBSD and Darwin operating systems. The reason NSA is involved in this project is because this organization is responsible for carrying out the research and advanced development of technologies needed to enable...
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...qwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmrtyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmrtyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmrtyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmrtyuiopasdfghjklzxcvbnmqwer...
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...Security in Linux Linux, like any other computing platform, is constantly changing. There are a few major focus points for new and upgraded platforms, one of which is how user friendly it is. User friendliness goes beyond the ability to simply point and click, it also goes behind the lines deep into the inner workings of the system. Security is one of the most important functions of any operating system, very commonly overlooked and taken for granted. A system administrator can configure tables that are provided by the Linux kernel firewall in a program called iptables. Iptables has the ability to redirect, modify or stop packets of data all based on the state of a connection at any given time. There are many different tables that can be defined and each table contains built in chains or user defined chains. Every chain is essentially a list of rules that matches a set of packets and it specifies what to do with a packet that matches the rules. For the casual user it is best to use the predefined rules, they are often more than adequate. In an enterprise situation the administrator would likely want to define additional rules in order to best suit the business needs. Before iptables Linux mainly used ipchains as a firewall package. Iptables is an improvement on ipchains because it monitors the state of connections. Iptables can use the state of the connection as opposed to ipchains using the source destination and content only, to redirect, modify or drop a packet. At least...
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...Term paper Linux Security Technologies There are many ways to have internet access these days. Coffee shops, libraries, airports and even public buses have free wireless access. With all these free accesses to the World Wide Web, there is also many potential ways for hackers to potentially get your personal information and use it for their gain. There are many ways to combat this situation by using several security measures with Linux programming, which the majority of the software is free. Some of those security technologies are SELinux, TCP Wrappers, IPtables and Chroot Jail to name a few. In basic Linux security, Discretionary Access Control is based practically by users and groups. The process is ran by a user and then has access to anything other users has access to, making it not so secure. The U.S. National Security Agency (NSA) developed the SELinux (Security Enhanced Linux) to combat the lack of strong security. The SELinux implements Mandatory Access Control (MAC) in the Linux kernel which enforces policies that limits the user or a program of what they can do. It is designed to prevent process from reading and/or tampering of data and programs. MAC is an important tool for containing security threats made by user errors, hackers or software errors. It’s pretty hard to bypass the security measure since the kernel is checking the MAC rules right after checking the DAC rules on a constant basis. There are three states you can place SELinux to run in; Enforcing...
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...| Linux Security | A review of some current technologies | | | | | In the pre-Internet world you have criminals looking for “hard” assets: money, jewelry and other items that could be easily turned into hard currency. We have always had “white-collar” crime such as embezzlement, fraud and insider trading. With the proliferation of the Internet and our personal and professional lives stored in the cloud; criminals can now take one ubiquitous piece of information and turn themselves into a whole other person. The ease in which such information can be used has turned people who would never think of ever holding up a bank, mugging someone or other physical crime, into criminals. This type crime has spawned a whole new “industry”: cyber security. One of the most important aspects of a network administrator’s job is to secure the system from any person who wishes to do criminal activities. These people are both within and outside the organization. With the Linux system there are three main technologies that are in use today. They are SELinux, chroot jail, and iptables. The first line of defense in a Linux system is chroot jail. Chroot is a process or application that changes the root directory for a user. To the user it appears that they are in their root directory, but they are actually in a modified root directory. This modified root directory is called jail. Without a chroot jail, a user with limited file permissions would still be able to navigate...
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...The Linux security technologies I researched are SELinux, chroot jail and iptables. SELinux (Security-Enhanced Linux) is a Linux feature that provides the mechanism for supporting access control security policies, including United States Department of Defense-style mandatory access controls, through the use of Linux Security Modules (LSM) in the Linux kernel. It is not a Linux distribution, but rather a set of kernel modifications and user-space tools that can be added to various Linux distributions. Its architecture strives to separate enforcement of security decisions from the security policy itself and streamlines the volume of software charged with security policy enforcement. The key concepts underlying SELinux can be traced to several earlier projects by the United States National Security Agency. The United States National Security Agency (NSA), the original primary developer of SELinux, released the first version to the open source development community under the GNU GPL on December 22, 2000. The software merged into the mainline Linux kernel 2.6.0-test3, released on 8 August 2003. Other significant contributors include Network Associates, Red Hat, Secure Computing Corporation, Tresys Technology, and Trusted Computer Solutions. Experimental ports of the FLASK/TE implementation have been made available via the TrustedBSD Project for the FreeBSD and Darwin operating systems. It provides an enhanced mechanism to enforce the separation of information based on confidentiality...
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...several security measures with Linux programming, which the majority of the software is free. Some of those security technologies are SELinux, TCP Wrappers, IPtables and Chroot Jail to name a few. In basic Linux security, Discretionary Access Control is based practically by users and groups. The process is run by a user and then has access to anything other users has access to, making it not so secure. The U.S. National Security Agency (NSA) developed the SELinux (Security Enhanced Linux) to combat the lack of strong security. The SELinux implements Mandatory Access Control (MAC) in the Linux kernel which enforces policies that limits the user or a program of what they can do. It is designed to prevent process from reading and/or tampering of data and programs. MAC is an important tool for containing security threats made by user errors, hackers or software errors. It’s pretty hard to bypass the security measure since the kernel is checking the MAC rules right after checking the DAC rules on a constant basis. There are three states you can place SELinux to run in; Enforcing, Permissive and Disabled. Enforcing is the default setting where no program or user can do anything not permitted by the security policy. Permissive is a diagnostic state where it sends warning but does not enforce the policy but you can use to build a new security policy. Disabled is where it does not enforce any security policies at all. Another Linux based security program...
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