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

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Firewalls 357 When the CA issues your certificate, you need to store it on your system and tell your web server where to find it.The final certificate is a text file that looks a lot like the CSR shown here. Auditing and Logging Your operating system enables you to log all sorts of events. Events that you might be interested in from a security point of view include network errors, access to particular data files such as configuration files or the NT Registry, and calls to programs such as su (used to become another user, typically root, on a Unix system). Log files can help you detect erroneous or malicious behavior as it occurs.They can also tell you how a problem or break-in occurred if you check them after noticing problems.The two main problems with log files are their size and veracity. If you set the criteria for detecting and logging problems at their most paranoid levels, you will end up with massive logs that are very difficult to examine.To help with large log files, you really need to either use an existing tool or derive some audit scripts from your security policy to search the logs for “interesting” events.The auditing process could occur in real-time or could be done periodically. In particular, log files are vulnerable to attack. If an intruder has root or administrator access to your system, she is free to alter log files to cover her tracks. Unix provides facilities to log events to a separate machine.This would mean that a cracker would need to compromise at least two machines to cover her tracks. Similar functionality is possible in Windows, but not as easy as in Unix. Your system administrator might do regular audits, but you might like to have an external audit periodically to check the behavior of administrators. Firewalls Firewalls are designed to separate your network from the wider world. In the same way that firewalls in a building or a car stop fire from spreading into other compartments, network firewalls stop chaos from spreading into your network. A firewall is designed to protect machines on your network from outside attack. It filters and denies traffic that does not meet its rules. It also restricts the activities of people and machines outside the firewall. Sometimes, a firewall is also used to restrict the activities of those within it. A firewall can restrict the network protocols people can use, restrict the hosts they can connect to, or force them to use a proxy server to keep bandwidth costs down. A firewall can either be a hardware device, such as a router with filtering rules, or a software program running on a machine. In any case, the firewall needs interfaces to two networks and a set of rules. It monitors all traffic attempting to pass from one network to the other. If the traffic meets the rules, it is routed across to the other network; otherwise, it is stopped or rejected.
358 Chapter 15 E-commerce Security Issues Packets can be filtered by their type, source address, destination address, or port information. Some packets are merely discarded; other events can be set to trigger log entries or alarms. Data Backups You cannot underestimate the importance of backups in any disaster recovery plan. Hardware and buildings can be insured and replaced, or sites hosted elsewhere, but if your custom-developed web software is gone, no insurance company can replace it for you. You need to back up all the components of your website—static pages, scripts, and databases—on a regular basis. Just how often you back up depends on how dynamic your site is. If it is all static, you can get away with backing it up when it has changed. However, the kinds of sites we talk about in this book are likely to change frequently, particularly if you are taking orders online. Most sites of a reasonable size need to be hosted on a server with RAID, which can support mirroring.This covers situations in which you might have a hard disk failure. Consider, however, what might happen in situations in which something happens to the entire array, machine, or building. You should run separate backups at a frequency corresponding to your update volume.These backups should be stored on separate media and preferably in a safe, separate location, in case of fire, theft, or natural disasters. Many resources are available for backup and recovery.We concentrate on how you can back up a site built with PHP and a MySQL database. Backing Up General Files You can back up your HTML, PHP, images, and other nondatabase files fairly simply on most systems by using backup software. The most widely used of the freely available utilities is AMANDA, the Advanced Maryland Automated Network Disk Archiver, developed by the University of Maryland. It ships with many Unix distributions and can also be used to back up Windows machines via SAMBA.You can read more about AMANDA at http://www.amanda. org/. Backing Up and Restoring Your MySQL Database Backing up a live database is more complicated than backing up general files.You need to avoid copying any table data while the database is in the middle of being changed. Instructions on how to back up and restore a MySQL database can be found in Chapter 12,“Advanced MySQL Administration.”
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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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Page 343 and 344: 306 Chapter 12 Advanced MySQL Admin
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Page 348 and 349: 13 Advanced MySQL Programming IN TH
Page 350 and 351: Transactions 313 applications such
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Page 354 and 355: Stored Procedures 317 changes the e
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Page 360: Next 323 +------+ | @l | +------+ |
Page 364 and 365: 14 Running an E-commerce Site THIS
Page 366 and 367: Considering the Types of Commercial
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Page 376: Next 339 Evolving Governmental Poli
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Page 398 and 399: 16 Web Application Security IN THIS
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 410 and 411: Securing Your Code 373 Consider the
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Page 416 and 417: Securing Your Web Server and PHP 37
Page 418 and 419: Securing Your Web Server and PHP 38
Page 420 and 421: Database Server Security 383 n Look
Page 422 and 423: Protecting the Network 385 Internet
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Page 426 and 427: Disaster Planning 389 hosted burned
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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
Page 438 and 439: Using Basic Authentication in PHP 4
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Using mod_auth_mysql Authentication
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18 Implementing Secure Transactions
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Providing Secure Transactions 411 N
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Using Secure Sockets Layer (SSL) 41
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Using Secure Sockets Layer (SSL) 41
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Providing Secure Storage 417 Screen
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Using Encryption in PHP 419 Storing
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Using Encryption in PHP 421 If you
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Using Encryption in PHP 423 and cre
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Using Encryption in PHP 425 Listing
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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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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 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 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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