.net data matrix reader 17: Network Scanning, Intrusion Detection, and Intrusion Prevention Tools in Objective-C

Draw Data Matrix ECC200 in Objective-C 17: Network Scanning, Intrusion Detection, and Intrusion Prevention Tools

Before we discuss how to configure file-sharing permissions correctly, it s important to examine the differences between peer-to-peer and client-server file-sharing environments. It is common in a networked Mac environment to have a handful of computers, each with file sharing enabled, with users trading files back and forth between each other without a central repository for the files. This type of environment is known as peer-topeer networking (P2P). Security in a P2P environment is generally straightforward and tends to be rather loose. Anyone with access to the computer usually has access to files on that machine. NOTE: Peer-to-peer in this context is not the same as it is when using an application like LimeWire to access files hosted anonymously on the Internet. In this context, peer-to-peer is strictly meant to indicate sharing files over network connections in small environments. As environments mature and grow larger, the distributed file sharing of P2P will give way to centralized file servers in what is typically described as a client-server, or twotier, environment. Client-server environments offer a single and centralized location for users to access files that are needed by multiple users. In a client-server environment, backup and security begin to play a much more critical role, because files are now accessible by multiple users who have access to that repository. File permissions become critical to maintaining security. The permissions and backup strategies are easier to deal with in client-server environments for two reasons. First, because clientserver environments have dedicated servers to handle many of the tasks that clients will handle in P2P environments. Second, because in a client-server environment, most data is stored on a server. There are some inherent challenges to migrating from a P2P to a server-based filesharing environment. Some users might have a hard time moving away from their old method of sharing files. The proper permission controls are often not set up correctly on the centralized data, if they are set up at all. Client machines might continue to share files after the transition simply because they weren t configured to not share them. This can lead to security issues that can be disastrous if not managed appropriately.
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WORKFLOW ENHANCEMENTS WITH FLASH CATALYST
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Listing 8-7. An Implementation of a Simple Mail DAO
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The first objective of Windows Phone Marketplace is to confirm the identity of an application s author. In the Internet era, attempts to claim false identity are extremely common think about millions of emails processed daily that claim to come from an online bank or an African prince. In a similar fashion, without a centralized approval mechanism, any malicious Windows Phone 7 application could claim to be genuine and capture the user s personal information. In software security, the concept of nonrepudiation refers to the guarantee that the application indeed came from the source it claims to have come from. On the Windows Phone 7 platform, the origin and safety of applications are confirmed during the application certification, a required step for all Windows Phone 7 applications. During application certification, the developer submits her application to the Windows Phone Marketplace and pays a fee, at which point Microsoft runs a series of automated and manual tests to confirm application safety and, to some extent, reliability. Currently, no application can be loaded onto the phone without going through Windows Phone Marketplace. While there is a possibility that this policy will be revisited in the future to allow enterprise customers to bypass Windows Phone Marketplace, at the time of this writing it is only a possibility. All Windows Phone 7 developers must sign up for the marketplace and must provide legitimate proof of their identity to the marketplace before any of the applications they create are available for installation on users phones. Once their identity is verified, application developers receive a code-signing certificate. This digital certificate verifies that the application was created by the specified company or individual, fulfilling the concept of non-repudiation mentioned previously.
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namespace WinServerSide { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { // set processing mode to remote reportViewer1.ProcessingMode = ProcessingMode.Remote; // specify report URL // please make sure to replace localhost with server name if needed reportViewer1.ServerReport.ReportServerUrl = new Uri(@"http://localhost/reportserver"); // specify report path, Folder = Accounting Report Pack // Report = Trial Balance reportViewer1.ServerReport.ReportPath = @"/Accounting Report Pack/Trial Balance"; // show the report this.reportViewer1.RefreshReport(); } } }
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Edit Parts (see Figure 6-11).
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CHAPTER 13 EXTENDING .NET REMOTING
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Creating a Top-Level Complex Type
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The first step in creating a native web service is to create stored procedures or functions that you want to make web callable. In our example, you need to create a stored procedure named GetEmployees that returns the EmployeeID, FirstName, and LastName columns of the Employees table. The complete script of the stored procedure is given in Listing 10-37. Listing 10-37. Creating the GetEmployees Stored Procedure CREATE PROCEDURE GetEmployees AS SELECT EmployeeID, FirstName, LastName FROM Employees
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CHAPTER 2 THE UNIFIED BUILD ENGINE: MSBUILD
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So far, the weather application that you have created is sending as many requests for weather data as the user types in zip codes. When the data comes back from the weather web service, the order that this data comes back in is not guaranteed. For example, if the user first types in 32207 (Jacksonville) and then types in 10001 (New York City), the weather results for Jacksonville may come in behind New York City, yet the user would not realize that she s seeing Jacksonville s weather when New York s zip code still remains on the screen. It would be great if there were a solution that gave an application the power to cancel out all weather requests that occurred prior to the latest one, i.e., in our example, a request for Jacksonville weather is canceled as soon as request for New York City weather is made. Rx.NET provides such a solution. There are two operators in Rx.NET TakeUntil() and Switch that allow for cancellation of operations that occur prior to the latest operation and are still in-flight so to speak, or are still pending the return values. Through the use of an elegant LINQ query, these operators tie together Observable collections, as you will see shortly. But first, there is some bad news: in the current implementation of .NET framework on Windows Phone 7, it is impossible to link the beginning of the asynchronous web service invocation to the end of that invocation. The root of the problem is the exclusion of the CreateChannel method implementation in the Windows Communication Foundation libraries on Windows Phone 7. Microsoft had to slim down and optimize .NET framework on the phone, and the loss of this method for the time being seems to be due to those optimization efforts. Nevertheless, the technique for canceling in-flight requests still applies to the clients with full.NET framework installed (Windows Forms and WPF applications) and to the Silverlight platform. For the weather application, we will demonstrate the technique of canceling those requests by creating a new Observable collection for the weather service each time a user types in a new zip code. Note, however, that the Observable subscriptions that you will be creating listen for any completed weather service requests, and not the specific ones. In other words, each one of these subscriptions would process both Jacksonville and New York City weather from the example, and the order that this weather data comes in would be irrelevant. This is due to the limitation that we have discussed in the current implementation of Windows Phone 7 framework at present, you cannot link the beginning of the web service call to the end of that service call on this platform. To make the cancellation of operations on the Observable collections possible while those operations are in-flight, you will change the code around to expose Observable collections to LINQ queries. Follow these steps to make operation cancellation possible: 7. At the top of the MainPage class (right above the constructor), paste the following code to declare a module-level Observable collection for the KeyUp events of the zip code text box:
CHAPTER 3 DOCUMENT MAPPING
Note To create concise samples, I will present throughout the book mostly console applications that focus
You may end up working with complex web pages that have many, even dozens, of input controls that belong to different forms on the page (for instance, a web page with a search form, a user registration form, and a contact form). By default, all validators defined on the page run and most likely prohibit your end user from moving to the next page because of validation errors that are seemingly unrelated to the user s chosen action. To solve this problem, you can use validation groups, which specify a set of related controls and their validators. You form a validation group by specifying a common group name (as a string) for the ValidationGroup property of each validator and the input control that triggers a page submission. Doing so ensures that only validators related to the control initiating the page submission run. Finally, you can disable any validation by setting the CausesValidation property of a postback control to false.
to the monitor) goes to sleep.
In the following lines (part of the original file), root and users in the admin group are given access to a Host_Alias of ALL to Runas_Alias for all users and run Cmnd_Alias of ALL. This is unlimited access to the system, and it is what makes root the powerful account that it is. If you want to reduce the access that administrative users (users defined as administrators in the Accounts preference pane) are given, you can edit this setting. Let s take a look at the following two lines that are in the default sudoers file:
CHAPTER 26 IN DEPTH: B ASE
This opens a simple text viewer with the man page displayed. You can move up and down line by line with the cursor keys, or move page by page using the Page Up and Page Down keys (these are sometimes labeled Pg Up and Pg Down). You can search by hitting the forward slash key (/). This will highlight all instances of the word you type. You can search for other examples of the word in the document by hitting the n key. The average man page will include many headings, but the following are the most common: Name: This is the name of the command. There will also be a one-sentence summary of the command. Synopsis: This lists the command along with its various command options (sometimes known as arguments or flags). Effectively, it shows how the command can be used. It looks complicated, but the rules are simple. First is the command itself. This is in bold, which indicates it is mandatory. This rule applies to anything else in bold: it must be included when the command is used. Anything contained within square brackets ([]) is optional, and this is usually where you will find the command options listed. A pipe symbol (|) separates any command options that are exclusive, which means that only one of them can be used. For example, if you see [apple|orange|pear], only one of apple, orange, or pear can be specified. Usually at the end of the Synopsis listing will be the main argument, typically the file(s) that the command is to work on and/or generate. Description: This is a concise overview of the command s purpose. Options: This explains what the various command options do, as first listed in the Synopsis section. Bearing in mind that command options tell the software how to work, this is often the most useful part of the man page. Files: This lists any additional files that the command might require or use, such as configuration files. Notes: If this section is present (and often it isn t), it sometimes attempts to further illuminate aspects of the command or the technology the command is designed to control. Unfortunately, Notes sections can be just as arcane as the rest of the man page. See Also: This refers to the man pages of other commands that are linked to the command in question. If a number appears in brackets, this means the reference is to a specific section within the man page. To access this section, type: man <section no> command. Although there are guidelines for the headings that should appear in man pages, as well as their formatting, the fact is that you may encounter other headings, or you may find nearly all of them omitted. Some man pages are the result of hours if not days of effort; others are written in ten minutes. Their quality can vary tremendously.
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