April 2005
Intermediate to advanced
344 pages
11h 59m
English
Content preview from Network Security Tools
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Scope of a Web Application
Depending on its architecture and size, a production web application can reside on a single server or span across many different servers and tiers, as shown in Figure 6-1. Ideally, a production web application’s source is grouped logically into presentation, business, and data layers and is separated physically across tiers. Anyone with experience testing web application security knows this is rarely the case. Table 6-1 provides a brief description of the types of code commonly found at each tier.
Table 6-1. Typical web application architecture
|
Tier |
Code description |
Example code |
|---|---|---|
|
Client |
Client-side/mobile code. |
JavaScript, VBScript, ActiveX, Java applets |
|
Frontend |
Hosts the user interface (UI)/presentation code. Can also contain business logic and data access code. |
ASP (VBScript), ASPX (C#/VB.NET), Java/JSP, PHP, Perl |
|
Middle tier |
Hosts code implementing a company’s business logic and data access code. |
C, C++, C#, VB.NET, Java |
|
Backend |
Hosts code for the retrieval and storage of application data. Code can also implement business logic rules. |
T-SQL, PL/SQL, MySQL dialect |
Figure 6-1. Typical web application architecture
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