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

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Securing Your Web Server and PHP 381 conf or C:\Program Files\Apache Software Foundation\Apache2.2\conf).You should definitely make sure that you have read the appropriate security sections in the online documentation for the server (http://httpd.apache.org/docs-project). In addition, you should do the following: n Make sure that httpd runs as a user without super-user privileges (such as nobody or httpd on UNIX).This is controlled by the User and Group settings in httpd.conf. n Make sure that the file permissions on the Apache installation directory are set correctly. On UNIX, this involves making sure that all the directories except for the document root (which defaults to using the htdocs/ subdirectory) are owned by root and have permissions of 755. n Make sure the server is set up to handle the correct number of connections. For users of the 1.3.x versions of httpd, you will want to set the value of MaxClients to some reasonable number of clients that can be processed at one time (the default value of 150 is reasonable, but if you expect a higher load, you may want to increase it). For Apache 2.x versions, where there is multithreading, you will want to check the value of ThreadsPerChild (the default of 50 is reasonable). n Hide files that you do not want seen by including appropriate directives in httpd.conf. For example, to exclude .inc files from being seen, you could add the following: Order allow, deny Deny from all Of course, as mentioned previously, we will want to move these files out of the document root for the specified website outright. Microsoft IIS Configuring IIS does not revolve around settings files as much as the Apache HTTP Server does, but there are still a number of things we should do to help secure our IIS installation: n Avoid having websites reside on the same drive as the operating system. n Use the NTFS file system and spend the time to remove write permissions from appropriate locations. n Delete all the files that are installed by IIS into the document root by default. Chances are you will not use a vast majority of these files (if not all of them). Large amounts of content are installed in the \inetpub directory, which, if you do not use the online configuration tools (and you should not—use the iisadmin utility instead), you will not need.
382 Chapter 16 Web Application Security n Avoid using common names. Large numbers of automated programs out there look for scripts and programs in obvious subdirectories of our document root, such as Scripts/, cgi-bin/, bin/, and so on. Again, reading the documentation for IIS to learn more about recommended security procedures is highly recommended. Commercially Hosted Web Applications There is one group of users for whom the problem of security on virtual servers is a bit more problematic—those users running their web applications on a commercial PHP/MySQL hosting service. On these servers, you likely will not have access to php.ini, and you will not be able to set all the options you would like. In extreme cases, some services will not even allow you to create directories outside of your document root directory, depriving us of a safe place to put our include files. Fortunately, most of these companies want to remain in business, and having an insecure design is not a good way to keep customers. To be certain, you can and should do a number of things as you look into a service and deploy your web applications with them: n Before you even select the service, look through their support listings. Better services will have complete online documentation (we even found a few with excellent dynamic tutorials) that show you exactly how your private space is configured.You can get a feel for what restrictions and support you will have by browsing through these. n Look for hosting services that give you entire directory trees, not just a document root. Although some will state that the root directory of your private space is the document root, others will give you a complete directory hierarchy, where public_html/ is where you place your content and executable PHP scripts. On these, you could safely create an includes/ directory.This will help us ensure that people cannot see the contents of our .inc files. n Try to find out what values they have used in php.ini. Although many will probably not print these on a web page or email you the file, you can ask their support personnel questions such as whether safe mode is turned on, and which functions and classes are disabled.You can also use the ini_get function to see setting values. Sites not using safe mode or without any functions at all disabled will worry us more than those with some reasonable sounding configuration. n Look at what versions of the various pieces of software they are running. Are they the most recent ones? If you cannot see the output of something such as phpinfo, use a service such as Netcraft (http://www.netcraft.com), which will tell you which software a particular site is running. Make sure that they are indeed running PHP5!
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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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Considering the Types of Commercial
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Page 374 and 375: Understanding Risks and Threats 337
Page 376: Next 339 Evolving Governmental Poli
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Page 400 and 401: Identifying the Threats We Face 363
Page 402 and 403: Understanding Who We’re Dealing W
Page 404 and 405: Securing Your Code 367 the security
Page 406 and 407: Securing Your Code 369 However, the
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Page 414 and 415: Securing Your Code 377 n n Have you
Page 416 and 417: Securing Your Web Server and PHP 37
Page 420 and 421: Database Server Security 383 n Look
Page 422 and 423: Protecting the Network 385 Internet
Page 424 and 425: Computer and Operating System Secur
Page 426 and 427: Disaster Planning 389 hosted burned
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Page 430 and 431: Implementing Access Control 393 Fig
Page 432 and 433: Implementing Access Control 395 Lis
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Page 436 and 437: Using Basic Authentication 399 Look
Page 438 and 439: Using Basic Authentication in PHP 4
Page 440 and 441: Using Basic Authentication with Apa
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Page 444 and 445: Using mod_auth_mysql Authentication
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Page 448 and 449: Providing Secure Transactions 411 N
Page 450 and 451: Using Secure Sockets Layer (SSL) 41
Page 452 and 453: Using Secure Sockets Layer (SSL) 41
Page 454 and 455: Providing Secure Storage 417 Screen
Page 456 and 457: Using Encryption in PHP 419 Storing
Page 458 and 459: Using Encryption in PHP 421 If you
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Page 462 and 463: Using Encryption in PHP 425 Listing
Page 464 and 465: Further Reading 427 The script you
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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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Fundamental Ajax 869 Figure 34.2 Th
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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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