PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

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Securing Your Web Server and PHP 379 PHP, the Apache HTTP Server, and Microsoft’s Internet Information Server (IIS), this means going to the appropriate website (http://www.php.net, httpd.apache.org, or www.microsoft.com/iis) on a semiregular basis and looking for security advisories, new releases, and browsing through the list of new features to see if any are indeed securityrelated bug fixes. Setting Up the New Version Configuration and installation of some of these software programs can be time consuming and require a good number of steps. Especially on the UNIX versions where you install from sources, there can be a number of other pieces of software you have to install first, and then a good number of command-line switches required to get all the right modules and extensions enabled. This is important: Make yourself a little installation “script” you follow whenever you install a newer version of the software.That way you can be sure you do not forget something important, which will only cause troubles later on.The number of steps is typically such that it is highly unlikely that our brains will remember every exact detail each time we run through an installation. Deploying the New Version Installations should never be done directly on the production server for the first time.You should always have a practice or test server to which you can install the software and web application and make sure everything still works. Especially for a language engine such as PHP, where some of the default settings change between versions, you will absolutely want to run through a series of test suites and practice runs before you can be sure that the new version of the software does not adversely affect your application. Note that you do not necessarily need to go out and spend thousands of dollars on a new machine to practice the setup and configuration. Many programs that allow you to run an operating system within yours, such as VMware, Inc.’s VMware or Microsoft’s VirtualPC software, will let you do this within the current operating system you are running. After you have verified that the new version of the software works well with your web application, you can deploy it to production servers. Here you should be absolutely sure that the process is either automated or again scripted on paper (or disk) so that you can follow an exact sequence of steps to replicate the correct server environment. Some final testing should be done on the live server to make sure that everything has, indeed, gone as expected (see Figure 16.2).
380 Chapter 16 Web Application Security Compile 1. built server 2. build PHP 3. set up configuration files 4. configure docments Test 1. verify basic operation 2. run test suites 3. run unit tests 4. perform stress testing Deploy 1. copy to server 2. verify basic operation 3. run test suites 4. run unit tests 5. perform some ad hoc testing Figure 16.2 The process of upgrading server software. Browse the php.ini file If you have not yet spent much time browsing through the php.ini, now is a good time to load it into a text editor and look through its contents. Most of the entries in the files have adequate comments above them describing their use.They are also organized by feature area/extension name; all mbstring configuration options have names starting with mbstring, whereas those pertaining to sessions (Chapter 23,“Using Session Control in PHP”) have session prefixed. There are a large number of configuration options for modules that we do not ever use, and if those modules are disabled, we do not have to worry about the options—they will be ignored. For those modules we do use, however, it is important to look through the documentation in the PHP Online manual (http://www.php.net/manual) to see what options that extension offers and what the possible values are. Again, it is highly recommended that we either make regular backups of our php.ini file or write down what changes we have made so that when we install new versions, we can be sure that the correct settings are still there. The only trick to these settings it that if you choose to use legacy software written in PHP, it may very well require that register_globals and/or register_long_arrays be turned on. In this case, you must decide whether using the software is worth the security risk.You can mitigate this risk by checking frequently for security patches and other updates for such software. Web Server Configuration After we are comfortable with the way we have configured the PHP language engine, we look next at the web server. Each server tends to have its own security configuration process, and we list those for the most popular two servers: Apache HTTP Server and Microsoft IIS. Apache HTTP Server The httpd server tends to come with a reasonably secure default installation, but there are a few things we will want to double-check before running it in a production environment.The configuration options all go in a file called httpd.conf, which tends to be in the /conf subdirectory of the base installation of httpd (that is, /usr/local/apache/
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PHP and MySQL ® Web Development Fo
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PHP and MySQL ® Web Development, F
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Contents at a Glance Introduction 1
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Table of Contents Introduction 1 I
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xii Contents Writing to a File 67 P
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xiv Contents Comparing Strings 119
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xvi Contents Overriding 170 Prevent
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xviii Contents Looking at the Datab
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xx Contents Using Indexes 305 Using
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xxii Contents Firewalls 357 Data Ba
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xxiv Contents 18 Implementing Secur
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xxvi Contents 22 Generating Images
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xxviii Contents Using a Standard Di
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xxx Contents Implementing Payment 6
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xxxii Contents Using an Existing Sy
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xxxiv Contents Learning More about
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Acknowledgments We would like to th
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Introduction WELCOME TO PHP AND MYS
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Introduction 3 PHP is an Open Sourc
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Introduction 5 Using the Open Datab
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Introduction 7 installing it for ma
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Introduction 9 What Is New in MySQL
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I Using PHP 1 PHP Crash Course 2 St
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14 Chapter 1 PHP Crash Course n n n
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16 Chapter 1 PHP Crash Course Listi
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18 Chapter 1 PHP Crash Course Bob
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20 Chapter 1 PHP Crash Course Notic
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22 Chapter 1 PHP Crash Course Figur
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24 Chapter 1 PHP Crash Course n Lon
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28 Chapter 1 PHP Crash Course Under
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30 Chapter 1 PHP Crash Course This
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32 Chapter 1 PHP Crash Course n n n
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34 Chapter 1 PHP Crash Course You s
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36 Chapter 1 PHP Crash Course If th
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38 Chapter 1 PHP Crash Course Logic
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40 Chapter 1 PHP Crash Course Or, e
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44 Chapter 1 PHP Crash Course We ge
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46 Chapter 1 PHP Crash Course Refre
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48 Chapter 1 PHP Crash Course If yo
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54 Chapter 1 PHP Crash Course Listi
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56 Chapter 1 PHP Crash Course A do.
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2 Storing and Retrieving Data NOW T
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Opening a File 61 The form field fo
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Opening a File 63 In a Unix environ
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Opening a File 65 Remember that the
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Writing to a File 67 Figure 2.3 Usi
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Closing a File 69 Listing 2.1 order
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Reading from a File 71 Listing 2.2
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Reading from a File 73 Knowing When
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Reading from a File 75 This line re
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Using Other Useful File Functions 7
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A Better Way: Database Management S
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3 Using Arrays THIS CHAPTER SHOWS Y
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Numerically Indexed Arrays 83 This
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Arrays with Different Indices 85 Th
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Array Operators 87 This line uses e
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Multidimensional Arrays 89 You can
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Multidimensional Arrays 91 Truck Pa
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Sorting Multidimensional Arrays 93
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Sorting Multidimensional Arrays 95
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Reordering Arrays 97 Listing 3.1 Co
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Loading Arrays from Files 99 Listin
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Loading Arrays from Files 101 part
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Performing Other Array Manipulation
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Performing Other Array Manipulation
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4 String Manipulation and Regular E
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Creating a Sample Application: Smar
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Formatting Strings 111 Figure 4.2 U
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Formatting Strings 113 Table 4.1 Ty
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Formatting Strings 115 Figure 4.3 A
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Joining and Splitting Strings with
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Comparing Strings 119 The length pa
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Matching and Replacing Substrings w
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Introducing Regular Expressions 123
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Finding Substrings with Regular Exp
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Next 131 Note In general, the regul
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134 Chapter 5 Reusing Code and Writ
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160 Chapter 6 Object-Oriented PHP U
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162 Chapter 6 Object-Oriented PHP I
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164 Chapter 6 Object-Oriented PHP S
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166 Chapter 6 Object-Oriented PHP H
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168 Chapter 6 Object-Oriented PHP f
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170 Chapter 6 Object-Oriented PHP c
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172 Chapter 6 Object-Oriented PHP I
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174 Chapter 6 Object-Oriented PHP }
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176 Chapter 6 Object-Oriented PHP T
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178 Chapter 6 Object-Oriented PHP L
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180 Chapter 6 Object-Oriented PHP L
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182 Chapter 6 Object-Oriented PHP o
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184 Chapter 6 Object-Oriented PHP U
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186 Chapter 6 Object-Oriented PHP F
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7 Error and Exception Handling IN T
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The Exception Class 195 In Listing
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User-Defined Exceptions 197 Listing
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Exceptions in Bob’s Auto Parts 19
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Exceptions in Bob’s Auto Parts 20
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Next 203 pression operator. If it f
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8 Designing Your Web Database NOW T
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Relational Database Concepts 209 Co
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Designing Your Web Database 211 Rel
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Designing Your Web Database 213 Ord
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Designing Your Web Database 215 Thi
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Web Database Architecture 217 Brows
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9 Creating Your Web Database IN THI
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Logging In to MySQL 221 we have use
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Introducing MySQL’s Privilege Sys
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Creating Database Tables 229 Go ahe
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Creating Database Tables 231 Listin
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Creating Database Tables 233 The bo
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Understanding MySQL Identifiers 235
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Choosing Column Data Types 237 For
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Choosing Column Data Types 239 Tabl
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Next 241 Table 9.10 TEXT and BLOB T
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244 Chapter 10 Working with Your My
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11 Accessing Your MySQL Database fr
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How Web Database Architectures Work
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Querying a Database from the Web 27
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Putting New Information in the Data
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Putting New Information in the Data
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Using Prepared Statements 281 Let
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Using Other PHP-Database Interfaces
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Next 285 The advantages of using MD
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288 Chapter 12 Advanced MySQL Admin
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13 Advanced MySQL Programming IN TH
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Transactions 313 applications such
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Foreign Keys 315 You should see the
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Stored Procedures 317 changes the e
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Stored Procedures 319 or drop funct
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Stored Procedures 321 action specif
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Next 323 +------+ | @l | +------+ |
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14 Running an E-commerce Site THIS
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Page 374 and 375: Understanding Risks and Threats 337
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Page 400 and 401: Identifying the Threats We Face 363
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Page 404 and 405: Securing Your Code 367 the security
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Page 418 and 419: Securing Your Web Server and PHP 38
Page 420 and 421: Database Server Security 383 n Look
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Page 430 and 431: Implementing Access Control 393 Fig
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Page 436 and 437: Using Basic Authentication 399 Look
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Page 454 and 455: Providing Secure Storage 417 Screen
Page 456 and 457: Using Encryption in PHP 419 Storing
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Page 464 and 465: Further Reading 427 The script you
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IV Advanced PHP Techniques 19 Inter
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432 Chapter 19 Interacting with the
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452 Chapter 20 Using Network and Pr
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470 Chapter 21 Managing the Date an
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22 Generating Images ONE OF THE USE
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Understanding Image Formats 485 JPE
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Creating Images 487 Figure 22.1 The
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Creating Images 489 It takes as par
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Using Text and Fonts to Create Imag
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Drawing Figures and Graphing Data 4
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Further Reading 507 Listing 22.5.4
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23 Using Session Control in PHP IN
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Understanding Basic Session Functio
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Implementing Simple Sessions 513 Re
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Creating a Simple Session Example 5
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Implementing Authentication with Se
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24 Other Useful Features SOME USEFU
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Serializing Variables and Objects 5
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Temporarily Altering the Runtime En
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Using PHP on the Command Line 531 h
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V Building Practical PHP and MySQL
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536 Chapter 25 Using PHP and MySQL
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26 Debugging THIS CHAPTER DEALS WIT
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Programming Errors 553 run into thi
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Programming Errors 555 That same st
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Programming Errors 557 A SQL query
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Variable Debugging Aid 559 Logic er
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Variable Debugging Aid 561 This cod
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Altering the Error Reporting Settin
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Handling Errors Gracefully 565 You
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Next 567 Figure 26.1 You can give f
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570 Chapter 27 Building User Authen
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608 Chapter 28 Building a Shopping
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652 Chapter 29 Building a Web-Based
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688 Chapter 30 Building a Mailing L
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742 Chapter 31 Building Web Forums
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772 Chapter 32 Generating Personali
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33 Connecting to Web Services with
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Project Overview: Working with XML
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Project Overview: Working with XML
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Solution Components 813 If you woul
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Solution Overview 815 Caching As we
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Solution Overview 817 Although it d
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Solution Overview 819 Figure 33.5 B
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Solution Overview 821 Listing 33.3
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Solution Overview 823 Let’s work
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Solution Overview 825 if(!eregi('^[
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Solution Overview 839 data, but bec
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Solution Overview 845 Using SOAP to
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Solution Overview 847 } if($type ==
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Solution Overview 849 in memory. No
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Installing the Project Code 853 for
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34 Building Web 2.0 Applications wi
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What Is Ajax? 857 n Other common me
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What Is Ajax? 859 display the h1 te
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Fundamental Ajax 861 Note For secur
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Fundamental Ajax 863 function getSe
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Fundamental Ajax 865 The next step
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Fundamental Ajax 867 Listing 34.3 C
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Adding Ajax Elements to Earlier Pro
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For More Information 885 Some popul
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A Installing PHP and MySQL APACHE,
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Installing Apache, PHP, and MySQL U
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B Web Resources THIS APPENDIX LISTS
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Apache Resources 909 The PHP Resour
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Index SYMBOLS ! (logical operator),
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array_count_values() function 913 c
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ottom.php files (Tahuayo applicatio
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collapsing threads (Web forum appli
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CVS (Concurrent Versions System) 91
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date and time 921 user table, 289 W
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downloading 923 directories browsin
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escaping characters 925 reading, 45
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files 927 FILE privilege, 226-227,
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functions 929 foreign keys database
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functions 931 escapeshellcmd(), 378
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functions 933 prototypes, 144 puten
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images 935 hardware failure (commer
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keys 937 INSERT statement, 244 inse
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MaxClients parameter (Apache) 939 l
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mysqli_query() function 941 multidi
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operators 943 O Object data type (v
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PHP 945 paths absolute, 62 file, 44
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php.ini file 947 gethostbyaddr(), 4
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purchase.php script (Shopping Cart
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eturning 951 Perl, 123 slash (\), 1
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security 953 buttons, calling, 493
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Shopping Cart application 955 Warm
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statements 957 special characters l
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tab control sequence (\t) 959 print
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time and date 961 limitations, 79 l
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usort() function 963 UPDATE privile
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Web databases 965 views, File Detai
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word processor formats 967 JPEG (Jo
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What’s on the CD? The book’s co
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