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Likewise, we should be able to see the public key in our current directory (where the server was run from) as [username].127.0.0.1.pub, where [username] is the name of the user who ran the client. If the same user runs the client again, the server should come back with success and we will not be prompted for our password, as authentication was done through the PKI verification process.

For now, though, we ll concentrate on the authentication side of things, which is unaffected by the type of connection used to transmit the email address and password of the customer Another issue related to security concerns storing user passwords It isn t a good idea to store user passwords in your database in plain text because this information is a potential target for attack Instead, you should store what is known as the hash of the password A hash is a unique string that represents the password but cannot be converted back into the password itself To validate the password entered by the user, then, you simply need to generate a hash for the password entered and compare it with the hash stored in your database If the hashes match, then the passwords entered match as well, so you can be sure that the customer is genuine.

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With all the code in place, it s time to analyze our own code and look for weaknesses, things that we may want to change in the future, and so on. First we ll examine the result of running a tool such as Flawfinder on the source. Then we ll look at some things we can do with our code in the future to enhance its value.

This leads to another important task you need to supply a way for new users to register The result of registration is to add a new customer to your database, including username and password hash information To implement this scheme in your application, you ll complete the following tasks: Create two new database tables, the first called customer to hold customer details, and the second called shipping_region, which stores possible shipping regions that a customer can reside in Implement the associated methods in data and business tiers that add, modify, and retrieve information from customer and shipping_region..

oCheckAccount.AccountNumber = 1000 dblBalance = oCheckAccount.GetBalance() oCheckAccount.Withdraw(500)

Flawfinder will then run recursively on that directory and examine all our source files automatically. The result of the run is something like the following:

Implementing a three-tiered architecture for the HatShop web site will help achieve the goals listed at the beginning of the chapter. The coding discipline imposed by a system that might seem rigid at first sight allows for excellent levels of flexibility and extensibility in the long run. Splitting major parts of the application into separate smaller components encourages reusability. More than once when adding new features to the site, you ll see that you can reuse some of the already existing bits. Adding a new feature without needing to change much of what already exists is, in itself, a good example of reusability. Another advantage of the three-tiered architecture is that, if properly implemented, the overall system is resistant to changes. When bits in one of the tiers change, the other tiers usually remain unaffected, sometimes even in extreme cases. For example, if for some reason the backend database system is changed (say, the manager decides to use Oracle instead of PostgreSQL), you only need to update the data tier and maybe just a little bit of the business tier.

Flawfinder version 1.24, (C) 2001-2003 David A. Wheeler. Number of dangerous functions in C/C++ ruleset: 128 Examining ./client/auth_client.c Examining ./client/auth_client.h Examining ./common/common.h Examining ./common/common.c Examining ./server/auth_server.h Examining ./server/auth_server.c ./client/auth_client.c:29: ./client/auth_client.c:154: [4] (buffer) sprintf: [2] (misc) fopen: Does not check for buffer overflows. Use snprintf or vsnprintf. Check when opening files - can an attacker redirect it (via symlinks), force the opening of special file type (e.g., device files), move things around to create a race condition, control its ancestors, or change its contents . ./client/auth_client.c:213: [2] (buffer) char: Statically-sized arrays can be overflowed. Perform bounds checking, use functions that limit length, or ensure that the size is larger than the maximum possible length.

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The three-tier architecture we ve been talking about so far is a particular (and the most popular) version of the n-Tier Architecture. n-Tier Architecture refers to splitting the solution into a

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