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When users log into the system, they expect an environment that can help them be productive This first program that users encounter is called a shell If you re used to the Windows side of the world, you might equate this with commandcom, Program Manager, or Windows Explorer (not to be confused with Internet Explorer, which is a web browser) Under UNIX/Linux, most shells are text-based A popular default user shell in Linux is the Bourne Again Shell, or BASH for short Linux comes with several shells from which to choose you can see most of them listed in the /etc/shells file Deciding which shell is right for you is kind of like choosing a favorite beer what s right for you isn t right for everyone, but still, everyone tends to get defensive about their choice! What makes Linux so interesting is that you do not have to stick with the list of shells provided in /etc/shells In the strictest of definitions, the password entry for each user doesn t list what shell to run so much as it lists what program to run first for the user Of course, most users prefer that the first program run be a shell, such as BASH

Official Objective Study Guide Coverage Ch # Pg #

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Note that the isValid( ) method calls UserRegistrygetUserByUserid( ) This method causes JPA actions to be taken Because the User class is a JPA Entity, and also has a JSR-303 Constraint applied to it, care must be taken when using JPA within the actual constraint implementation, as we do here To prevent nested transactions, we have added a <validationmode>NONE</validation-mode> element to the persistencexml This file is shown later in the chapter We can now look to the submit button for the form, whose value attribute is #{registerBackingregisterUser} The JSF lifecycle ensures that registerUser( ) will only be called if all the submitted values are valid and in the proper Java language type Before reviewing the registerUser( ) method, a very important subtlety becomes apparent when we examine the value attribute for all of the input fields on the registerxhtml page For example, <h:inputText label="First Name" id="fname" value="#{userfirstName}" required="true"/> This stores a value to the firstName property on a managed bean called user Recall from Figure 10-14 that the User entity also is declared as a managed bean This approach allows the JSF managed bean facility to instantiate the entity so that it can be persisted in the registerUser( ) method To do so, we simply can get it out from request scope, store the password into it, and call the addUser( ) method on UserRegistry If the persistence attempt fails, we add a message and redirect to the main page

Identify different Linux Intrusion Detection Systems (IDS) (for example, Snort, PortSentry) (47) Given security requirements, implement basic IP tables/chains (note: requires knowledge of common ports) (48) Implement security auditing for files and authentication (49) Identify whether a package or file has been corrupted/altered (for example, checksum, Tripwire) (410) Given a set of security requirements, set password policies to match (complexity/aging/shadowed passwords) (for example, identify systems not shadow passwords) (411) Identify security vulnerabilities within Linux services (412) Set up user-level security (for example, limits on logins, memory usage, and processes) (413) Documentation (50) Establish and monitor system performance baseline (for example, top, sar, vmstat, pstree) (51) Create written procedures for installation, configuration, security, and management (52) Document installed configuration (for example, installed packages, package options, TCP/IP assignment list, changes, configuration, and maintenance) (53)

This is the encrypted password file It stores the encrypted password information for user accounts In addition to the encrypted password, the /etc/shadow file stores optional password aging or expiration information The introduction of the shadow file came about because of the need to separate encrypted passwords from the /etc/passwd file This was necessary because the ease with which the encrypted passwords could be cracked was growing with the increase in the processing power of commodity computers (home PCs) The idea was to keep the /etc/passwd file readable by all users without storing the encrypted passwords in it and then make the /etc/shadow file only readable by root or other privileged programs that require access to that information An example of such a program would be the login program One might wonder, Why not just make the regular /etc/passwd file readable by root only or other privileged programs Well, it isn t that simple By having the password file open for so many years, the rest of the system software that grew up around it relied on the fact that the password file was always readable by all users Changing this would simply cause software to fail

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