operating system linux and unix

... LESSON 9 Linux Operating System Vulnerabilities and security Objectives ♦ Describe the fundamentals of the Linux operating system ♦ Describe the vulnerabilities of the Linux operating system ... system ♦ Describe Linux remote attacks ♦ Explain countermeasures for protecting the Linux operating system 2 Review of Linux Security Fundamentals ♦ Linux is a version of UNIX – Usually available ... Ubuntu – Mandrak – Sambian – Knoppix 3 4 5 Crack Password ♦ /etc/passwd ♦ sc/etc/shadow Root:2bcadvr345:0:0:root: /root: /bin/bash - John The Ripper - Viper - Slurple 6 7 Linux File System ♦ Ls

Ngày tải lên: 29/07/2014, 08:20

... Automating Linux and Unix System Administration Second Edition Nate Campi and Kirk Bauer Automating Linux and Unix System Administration, Second Edition Copyright ... strengths of UNIX and UNIX- like operating systems is the fact that almost everything on the system is represented to the user as a file Both real and pseudo devices (such as , , and so on) can ... open source and therefore usable on commercial UNIX systems In addition to consistent commands, a consistent filesystem layout can be helpful As we already mentioned, placing custom commands in the

Ngày tải lên: 13/08/2014, 04:21

... checks and fixes the ownership and permissions on , , and It also calculates and records the MD5 checksum of On any system in the class , the permissions on are checked because that is the standard ... would recommend, though, that you start out with just two systems Once you get cfengine up and running on those systems, expanding the system to other hosts is easy enough In later chapters we’ll ... other systems (because those systems don’t have the files there to copy) All systems, however, can benefit from allowing remote execution, because it allows you to execute on demand from remote systems

Ngày tải lên: 13/08/2014, 04:21

... master, system upgrade, and patching procedures is easy before the systems and procedures are put into use Once you’ve been deploying and updating systems using automated means, reorganizing and ... example: On all systems, the command is executed to synchronize the system? ??s clock Cfengine terminates this command in 30 seconds if it has not completed On systems running Red Hat Linux, a script ... our new systems will be booted from the network, and during the imaging process they will have cfengine installed and configured to use our cfengine master system Cfengine will handle all system

Ngày tải lên: 13/08/2014, 04:21

... (goldmaster.campin.net) and our Red Hat Kickstart system (rhmaster.campin.net) as the two systems that sync to an external NTP source Note There is no reason to choose Linux over Solaris systems to handle this ... , and we set up two filesystems and a swap slice : The keyword is required in every profile Besides , other possible values for that keyword include and for upgrades and installations via a flash ... SYSIDCFG AND IP ADDRESS ASSIGNMENT Note that you cannot specify the IP address of a Solaris system in the file after the system gets its IP address from Reverse Address Resolution Protocol (RARP) and

Ngày tải lên: 13/08/2014, 04:21

... ฀ ฀ and On Solaris, the files are and The and files map filesystem paths to files that contain the commands to mount a remote share at that path The and files have the actual mount commands ... handles routing, Network Address Translation (NAT), and DNS-caching services After we get DNS up and running on one or more of our UNIX systems, we’ll have cfengine configure the rest of our systems ... (and often does) result in a major change to the local system? ??s time, basically a jump forward or backward in the system? ??s clock By contrast, when sees a gap between the local system? ??s time and

Ngày tải lên: 13/08/2014, 04:21

... a network, and to make the choice that best suits your needs Even sites running similar operating systems and applications might have very different requirements around performance and 251 ... such as , , and so on In Chapter 5, we installed these on the rhmaster system in order to compile cfengine First we’ll download the latest Apache and PHP sources, place them in , and extract ... on Linux and on We’ll modify our master automounter files ( Solaris) to import a new map file, and use cfengine to automatically create the file with the appropriate contents for that type of system

Ngày tải lên: 13/08/2014, 04:21

... don’t want to keep an explicit list of all your systems and have one system try to pull the directory contents from each You’d rather have each system be responsible for pushing its directory ... ฀ command using the command ฀ ฀ ฀ ฀ ฀ Note The pipe to the mail command is outside the for loop, so we don’t get a separate mail for each directory under If you’re not sure you understand why ... account we created, and we were presented with the Nagios web interface If you click Service Detail in the left-hand frame, you’ll see details for the system ฀ ฀ ฀right-hand frame It should look

Ngày tải lên: 13/08/2014, 04:21

... MERGING CRASH COURSE Most system administrators are familiar with the and commands The command is used to compare text files line by line and show the differences The command takes a file containing ... the cfengine repository We logged into the system goldmaster as our own user account and checked out a working copy with these commands: These commands will give us a working copy at Since our ... source files If merging is entirely new to you and you’re still struggling to understand the concepts, you’re not alone Revision control system tools and concepts are best learned by working with

Ngày tải lên: 13/08/2014, 04:21

... managing the contents and permission of files is the core of UNIX /Linux system administration UNIX /Linux security is also almost entirely concerned with file contents and permissions... ... since most modern UNIX systems support ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ents, take a ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ well as client libraries and compiles on a wide variety of systems A second, newer ... work to set up, and you have to make sure your systems can take advantage of... manage ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀look at LDAP System Administration ฀ ฀ ฀ ฀ ฀ ฀ CHAPTER 12 ฀ IMPROVING SYSTEM SECURITY

Ngày tải lên: 13/08/2014, 04:21

... repetition operators (and others support XwXy instead). The acnal command can also be found on many systems. If you find yourself limited by the standard cnal command and the differences ... Sun systems, patching, 360 svn_access file, 245 svnadmin hotcopy command, 346 svn.campin.net file, 244–245 svn commit command, 330 svn copy command, 331 svn import command, 249 svn log command, ... section, we ran the command and piped the output into the com฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ and commands enabled us to find the systems that are running the Niagara T1 processor and then to set the class

Ngày tải lên: 13/08/2014, 04:21

... ฀฀฀฀฀฀฀฀฀฀฀฀ 1. Boot server: This system provides network clients with the information they need to boot and install the operating system. 2. Profile server: This system hosts what the JumpStart ... installed on a system. A pro- file describes aspects of the configuration such as the software group to install and the disk partition (slice) layout. The format is easy to understand, and because ... include qlcn]`a and bh]od[ejop]hh for upgrades and installations via a flash archive, respectively (a flash archive is a system image, not unlike a tarball snapshot of a system) . The Ouopai[pula

Ngày tải lên: 14/08/2014, 02:20

... managing the contents and permission of files is the core of UNIX /Linux system administration UNIX /Linux security is also almost entirely concerned with file contents and permissions... ... administrators to execute commands that require root privileges with single command like this: This way, root commands are logged via syslog by the command, so our log host gets the logs, and the regular ... commands run as root There is a problem, though Nothing stops our administrators from running a command that gives them a root shell: ฀ ฀ ฀ ฀ ฀ ฀ ฀... Linux systems through cfengine, and

Ngày tải lên: 14/08/2014, 02:21

... repetition operators (and others support XwXy instead). The acnal command can also be found on many systems. If you find yourself limited by the standard cnal command and the differences ... Sun systems, patching, 360 svn_access file, 245 svnadmin hotcopy command, 346 svn.campin.net file, 244–245 svn commit command, 330 svn copy command, 331 svn import command, 249 svn log command, ... section, we ran the command and piped the output into the com฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ and commands enabled us to find the systems that are running the Niagara T1 processor and then to set the class

Ngày tải lên: 14/08/2014, 02:21

... [2001], and Anonymous [1999]. For Linux systems (and eventually other Unix- like systems), you may want to examine the Bastille Hardening System, which attempts to “harden” or “tighten” the Linux operating ... random input) 2.1.5 Comparing Linux and Unix This book uses the term Unix- like” to describe systems intentionally like Unix In particular, the term Unix- like” includes all major Unix ... model of Unix- like systems, and the C programming language. This book does include some information about the Linux and Unix programming model for security. This book covers all Unix- like systems,

Ngày tải lên: 24/03/2014, 04:20

... Windows NT operating system is rather complex and different from other operating systems It has many unique features and mechanisms which impact on understanding, monitoring and security ... and Fedora Linux, the Debian package management system for Debian and Ubuntu Linux 14 CHAPTER 2 BACKGROUND AND RELATED WORK Mobile operating systems such Apple’s iOS and Google’s... ... knowledge on operating system monitoring and Windows We also show and some existing monitoring systems and tools Chapter 3 presents our monitoring infrastructures LBox and WinResMon

Ngày tải lên: 10/09/2015, 08:35

... driver, I2C subsystem, and USB gadgets. vi Embedded Linux System Design and Development Ⅲ Borland is a registered trademark of Borland Software Corporation in the United States and other countries. ... Sriram Neelakandan xx Embedded Linux System Design and Development Linux- based embedded system does not stop with the OS but has to do a lot with writing and building applications. And applications ... Understand and create Linux BSP for a hardware platform. Ⅲ Understand the Linux model for embedded storage and write drivers and applications for the same. Ⅲ Understand various embedded Linux drivers...

Ngày tải lên: 04/08/2012, 14:23

... size, scope and complexity. The Alto operating system [22], a workstation operating system of the early 70’s, occupied approximately 19K bytes, including code and data. A typical UNIX implemention ... of an extensible operating system is once again gaining acceptance this time as the solution to the unconstrained growth of UNIX. During the last 20 years operating systems and their environments ... with four CPUs and a number of MicroVAX IIs and IBM RT PCs interconnected via several Ethernets and IBM token rings. 20 [18] Ritchie, D.M. and Thompson, K. The Unix Time-Sharing System. Communications...

Ngày tải lên: 12/09/2012, 15:05

... *message, BHandler *handler, BHandler *replyHandler = NULL) The first parameter, message, is the BMessage object to post. The second parame- ter, handler, names the target handler—the BHandler object ... looper and then dispatched to a handler. Posting and dispatching a message Once created, a message needs to be placed in the message loop of a looper’s thread and then delivered to a handler. ... entirety (recall that the text-editing commands B_CUT, B_COPY, B_PASTE, and B_SELECT_ALL are standard messages that are automatically handled by the system) : void MyHelloWindow::MessageReceived(BMessage*...

Ngày tải lên: 17/10/2013, 19:15