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nce a site has a set of basic applications in working order, the next step is to add more advanced functionality to complement the existing behavior. This can sometimes be a matter of simply adding more applications, each providing new features for users and employees alike. Other times, there are ways of enhancing your existing applications so they grow new features directly, without a separate application that can stand on its own. These meta-applications or sub-frameworks are built with the goal of easily integrating into an existing application, using hooks that are already provided. This book has illustrated many such hooks, and they can be used in combination to great effect. It s often possible to write a tool that performs a lot of tasks but only requires adding a single line of code to an existing application.

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One common need among larger companies is surveillance of the company s data. It s important to know who is making changes; if anything goes wrong, there s someone who can be held accountable. This is also useful for smaller businesses, but the need is less urgent with fewer employees who have access to the data in question. Nearly any organization of any size can benefit from knowing who last changed a model instance, but it s often left to those other guys who really need it. It doesn t have to be that way. Combining a few of the tools available in Django, recording the user who last made changes to a model instance doesn t have to be a difficult task. On the surface, it seems ridiculously simple. A standard way to override what values get saved for a field is to override the model s method and set the value there. 10 showed how this can be used to calculate one field s value based on the values of other fields. It seems reasonable that this same technique could be used to insert the current user into a field.

The preceding code generates a random seven-digit salt. The salt is prepended to the password string before hashing; this means that even if two users have the same password, their individual password hashes will be different. However, in order to reproduce that hash, the salt needs to be available. For this reason, the salt is also prepended, unencrypted, to the hash. This way, when a user signs in, you re able to extract the salt from the hash when it s retrieved from the database and use it to recreate the salted hash of the user s password:

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There s just one problem: where does come from Django s models are separated from views, so the request isn t just magically available inside a model method. One possible solution is to pass the user in manually. After all, the request isn t what s really important; it s the user we re after.

$salt = substr($dbhash, 0, 7); // extract salt from stored hash $hash = $salt . sha1($salt . $_POST['password']); if ( $dbhash==$hash ) { echo "Match!"; } else { echo "No match."; }

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Then, when the time comes for a view to save an thing like this:

Using specificity in this manner gives us lots of flexibility with our layouts, without having to adjust the markup one bit.

By adding a salt, rainbow tables are rendered useless. A new table will need to be generated taking the salt into account in order to crack user passwords; while this isn t impossible, it s time-consuming for the attacker and adds an extra layer of security to your app. In most applications (especially those that don t store much in the way of sensitive personal information such as credit card information), a salted password is deterrent enough to ward off potential attackers. As an additional countermeasure, it is also advisable to add a check for repeated failed attempts to log in. This way, an attacker has a finite number of attempts to crack a password before being locked out of the system. This can also prevent denial of service attacks, or attacks in which a huge volume of requests are sent in an attempt to overload a site and take it offline.

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Summary

Creating this function is relatively straightforward, requiring only a few steps: 1. Check whether a salt was supplied; if not, generate a new salt by hashing the current UNIX timestamp, and then take a substring of the returned value at the length specified in $_saltLength and store it as $salt. Otherwise, take a substring of the supplied salted hash from the database at the length specified in $_saltLength and store it as $salt. Prepend the salt to the hash of the salt and the password, and return the new string.

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