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The final test case, testImagesFromTags, is shown in Listing 16-25. The test can seem rather confusing at first, but the principle is to check that the correct number of image ids is returned for each given tag. To do this, one image is added at a time; then the getIds method is called, and the number of returned ids is compared with the expected result. The entire procedure is described as follows: 1. Add an image with the tags Foo and Bar. 2. Verify that getTags returns two tags. 3. Verify the number of ids returned for Foo, Bar, and Baz; and a list containing Foo and Bar. 4. Add an image with the tag Baz. 5. Verify that getTags returns three tags. 6. Verify the number if ids returned for Foo, Bar, and Baz. 7. Add an image with the tags Bar and Baz. 8. Verify that getTags returns three tags. 9. Verify the number of ids returned for Foo, Bar, and Baz; and a list containing Bar and Baz. To determine the number of expected ids for each set of tags, it is important to remember that getIds is expected to return each image that has at least one of the given tags. This means that when querying for images with Bar or Baz, all three image ids are returned. The first image contains Bar, the second contains Baz, and the third contains both. Listing 16-25. Testing images and tags at once void ImageCollectionTest::testImagesFromTags() { ImageCollection c; QCOMPARE( c.getIds( QStringList() ).count(), 0 ); QImage image( "test.png" );

AuthKit is a complete authentication and authorization framework for WSGI applications and was written specifically to provide Pylons with a flexible approach to authentication and authorization. AuthKit can be used stand-alone with its user management API or integrated with other systems such as a database. You ll see both of these approaches in this chapter and the next. AuthKit consists of three main components: Authentication middleware: Intercepts any permission errors or HTTP responses with a 401 status code and presents a user with a way to sign in. Various authentication methods can be used, and the middleware is also responsible for setting the REMOTE_USER environ variable once a user has signed in. Permission objects: Represent a particular permission that a user may or may not have. Authorization adaptors: Check the permissions, triggering a PermissionError, which is intercepted by the authentication middleware if the permission check doesn t pass. If no PermissionErrors are raised, the user is considered to be authorized. In this chapter, you ll learn about each of these components in turn before looking at AuthKit s more advanced features.

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Of course, AuthKit is just one of the authentication and authorization tools available for Pylons. There may be occasions when you want to handle all authentication yourself in your application rather than delegating responsibility to AuthKit. Although AuthKit provides a basic platform on which to build, you should also be willing to look at the AuthKit source code and use it as a basis for your own ideas.

There are alternative approaches and tools that can be used to find buffer overflows (as well as other security bugs). Static analysis is one such approach. Static analysis is a type of analysis that can be done to programs without running them. With respect to security, there are various types of checks that are interesting for a static analysis tool to conduct. For instance, when a function receives input from a caller, that input can be considered tainted until it is checked (to make sure that it is not null, or that it has been sanitized by a check function prior to further use). Very often, compilers have all the mechanisms required to do such checks, but do not have the specific knowledge of what types of static analysis checks make sense for an application. Dawson Engler s research group at Stanford University identified the opportunity to do meta-level compilation, in which compilers can be extended with declarations that give them such knowledge, and can be used to find security as well as other types of bugs (Engler et al. 2000). Meta-level compilation can also detect frequent patterns and idioms used in code, and report a warning or error when some anomalous part of the code does not follow the pattern, possibly indicating a bug. Synchronization and memory bugs, in addition to security bugs, can be found using static analysis. Companies such as Coverity (www.coverity.com),7 Fortify (www.fortifysoftware.com), Ounce Labs (www.ouncelabs.com), and Klocwork (www.klocwork.com) build static analysis and other tools that allow you to scan through your code to identify security and other types of bugs. It is worthwhile to use them, since such tools have successfully found many bugs in OS and application code that has been tested, reviewed, and deployed. For instance, the Coverity

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