Different copies of these classes exist in each security sandbox created by Flash. The separation between security domains also extends into the native ActionScript class definitions in Flash Player that are used by all SWFs. This may be worked around by calling Security.allowDomain.Īny attempt of accessing the loaded SWF's content, even tracing the ntent property as seen above, will fail creating a security error if dealing with content in different security domains. SecurityError: Error #2121: Security sandbox violation: // ntent: // cannot access. The following code shows a SWF which attempts to load another SWF - whose contents are irrelevant - and access its document class instance (main timeline). Attempting to access data in another security domain will create a security error. Both their data, and the code they execute, are cut off from one another in a way that prevents interaction. variables) in one SWF cannot inherently be accessed by another SWF if they exist in separate security domains. More on that is covered in the Non-executable Trust section.įor SWFs, security domains separate both data and code execution. These domains determine how accessibility the content is or even whether the content can be loaded at all. Non-executable (non-SWF) content, such as image or text files, is also separated into security domains, again using their source domains as the determining factor as to which security domain they belong. Example code will also be simplified though complete enough that they should mostly work when used as timeline scripts within the Flash Professional authoring tool. In Flash, different subdomains are seen as different as different top-level domains. Security domain sandboxes in Flash Playerįor examples in this tutorial, you'll see subdomains of the same top-level domain (, to protect the innocent) used to represent different domains. Having two separate security domains causes the each of the SWFs to be run in their own sandboxes within Flash Player. A SWF hosted on the would have a security domain linked to the domain, while a SWF being hosted on would have a separate security domain linked to the domain name. Security domains link themselves to a content's source domain, or the domain from which content (e.g. Security domains in Flash are the top level sandboxes. This separation is handled through Flash Player by sandboxes known as application domains. Keeping them separate allows them to function normally, avoiding any conflict that might have occurred as a result of bringing them together. You may also want to sandbox two pieces of content to prevent conflicts with overlapping naming schemes. Though security is a primary case for sandboxing, it may not be the only reason. Flash Player's security model uses sandboxes known as security domains to separate content this way. Sandboxes are especially important in security where, without the appropriate trust, two separate pieces of content should not be able to interact with each other when they shouldn't. Sandboxing the process of separating groups of data and/or code execution from one another. The following tutorial will cover what security and application domains are and how they're used in Flash Player, both in terms of providing functionality as well as protection through security. Or maybe you're just confused about the difference between Security.allowDomain and crossdomain.xml files or want to know about best practices around security. Maybe there's some external content that you're having trouble accessing. You'll want to have more control over behavior, or enable functionality that's not possible using the default settings. Even if you've loaded external content in the past (which is when they come into play), the defaults probably worked well enough for you then not to have to worry about what they do or mean.īut sometimes you will need a little more. If you haven't yet had to bother with the complexities around security domains or application domains, consider yourself lucky. Pages: 1 | 2 Security Domains, Application Domains, and More in ActionScript 3.0 Date
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |