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

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Digital Certificates 355 end, the usual way of creating a digital signature is to create a message digest for the whole message using a fast hash function and then encrypt only the brief digest using a slow public key encryption algorithm.The signature can now be sent with the message via any normal unsecure method. When a signed message is received, it can be checked.The signature is decrypted using the sender’s public key. A hash value is then generated for the message using the same method that the sender used. If the decrypted hash value matches the hash value you generated, the message is from the sender and has not been altered. Digital Certificates Being able to verify that a message has not been altered and that a series of messages all come from a particular user or machine is good. For commercial interactions, being able to tie that user or server to a real legal entity such as a person or company would be even better. A digital certificate combines a public key and an individual’s or organization’s details in a signed digital format. Given a certificate, you have the other party’s public key, in case you want to send an encrypted message, and you have that party’s details, which you know have not been altered. The problem here is that the information is only as trustworthy as the person who signed it. Anybody can generate and sign a certificate claiming to be anybody he likes. For commercial transactions, it would be useful to have a trusted third party verify the identity of participants and the details recorded in their certificates. These third parties are called certifying authorities (CAs).They issue digital certificates to individuals and companies subject to identity checks.The two best known CAs are VeriSign (http://www.verisign.com/)and Thawte (http://www.thawte.com/), but you can use a number of other authorities.VeriSign owns Thawte, and there is little practical difference between the two. Some other authorities, such as Network Solutions (http://www.networksolutions.com) and GoDaddy (http://www.godaddy.com/), are significantly cheaper. The authorities sign a certificate to verify that they have seen proof of the person’s or company’s identity. It is worth noting that the certificate is not a reference or statement of creditworthiness.The certificate does not guarantee that you are dealing with somebody reputable.What it does mean is that if you are ripped off, you have a relatively good chance of having a real physical address and somebody to sue. Certificates provide a network of trust. Assuming you choose to trust the CA, you can then choose to trust the people they choose to trust and then trust the people the certified party chooses to trust. The most common use for digital certificates is to provide an air of respectability to an e-commerce site.With a certificate issued by a well-known CA, web browsers can make SSL connections to your site without bringing up warning dialogs.Web servers that enable SSL connections are often called secure web servers.
356 Chapter 15 E-commerce Security Issues Secure Web Servers You can use the Apache web server, Microsoft IIS, or any number of other free or commercial web servers for secure communication with browsers via Secure Sockets Layer. Using Apache enables you to use a Unix-like operating system, which is almost certainly more reliable but slightly more difficult to set up than IIS.You can also, of course, choose to use Apache on a Windows platform. Using SSL on IIS simply involves installing IIS, generating a key pair, and installing your certificate. Using SSL on Apache requires that the OpenSSL package is also installed and the mod ssl module is enabled during installation of the server software. You can have your cake and eat it too by purchasing a commercial version of Apache. For several years, Red Had sold such a product, called Stronghold, which is now bundled with Red Hat Enterprise Linux products. By purchasing such a solution, you get the reliability of Linux and an easy-to-install product with technical support from the vendor. Installation instructions for the two most popular web servers, Apache and IIS, are in Appendix A,“Installing PHP and MySQL.” You can begin using SSL immediately by generating your own digital certificate, but visitors to your site will be warned by their web browsers that you have signed your own certificate.To use SSL effectively, you also need a certificate issued by a certifying authority. The exact process to get this certificate varies between CAs, but in general, you need to prove to a CA that you are some sort of legally recognized business with a physical address and that the business in question owns the relevant domain name. You also need to generate a certificate signing request (CSR).The process for this varies from server to server.You can find instructions on the CAs’ websites. Stronghold and IIS provide a dialog box–driven process, whereas Apache requires you to type commands. However, the process is essentially the same for all servers.The result is an encrypted CSR.Your CSR should look something like this: ---BEGIN NEW CERTIFICATE REQUEST--- MIIBuwIBAAKBgQCLn1XX8faMHhtzStp9wY6BVTPuEU9bpMmhrb6vgaNZy4dTe6VS 84p7wGepq5CQjfOL4Hjda+g12xzto8uxBkCDO98Xg9q86CY45HZk+q6GyGOLZSOD 8cQHwh1oUP65s5Tz018OFBzpI3bHxfO6aYelWYziDiFKp1BrUdua+pK4SQIVAPLH SV9FSz8Z7IHOg1Zr5H82oQOlAoGAWSPWyfVXPAF8h2GDb+cf97k44VkHZ+Rxpe8G ghlfBn9L3ESWUZNOJMfDLlny7dStYU98VTVNekidYuaBsvyEkFrny7NCUmiuaSnX 4UjtFDkNhX9j5YbCRGLmsc865AT54KRu31O2/dKHLo6NgFPirijHy99HJ4LRY9Z9 HkXVzswCgYBwBFH2QfK88C6JKW3ah+6cHQ4Deoiltxi627WN5HcQLwkPGn+WtYSZ jG5tw4tqqogmJ+IP2F/5G6FI2DQP7QDvKNeAU8jXcuijuWo27S2sbhQtXgZRTZvO jGn89BC0mIHgHQMkI7vz35mx1Skk3VNq3ehwhGCvJlvoeiv2J8X2IQIVAOTRp7zp En7QlXnXw1s7xXbbuKP0 ---END NEW CERTIFICATE REQUEST--- Armed with a CSR, the appropriate fee, and documentation to prove that you exist, and having verified that the domain name you are using is in the same name as in the business documentation, you can sign up for a certificate with a CA.
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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 341 and 342: 304 Chapter 12 Advanced MySQL Admin
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Page 360: Next 323 +------+ | @l | +------+ |
Page 364 and 365: 14 Running an E-commerce Site THIS
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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
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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 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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Using Basic Authentication with Apa
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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 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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