[jira] [Created] (SLING-2572) Redirect validating service

["Jeff Young (JIRA)" <ji...@apache.org>]

Jeff Young created SLING-2572:
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             Summary: Redirect validating service
                 Key: SLING-2572
                 URL: https://issues.apache.org/jira/browse/SLING-2572
             Project: Sling
          Issue Type: Improvement
          Components: General
            Reporter: Jeff Young


Clients need to validate redirects to esure that they point on-site (or perhaps to an authority on a white-list) to prevent phishing attacks.  A Sling service which performed this would allow consistency (and a single point of extension).

There already exists AuthUtil.isRedirectValid() [0], but it doesn't handle URLs (only paths), and disallows relative paths (the second of which, at least, is widely used).

There is also a referrer validating service [1] which might provide a better starting point.

Lastly, if we had backward-compatibility concerns with some of the algorithms encoded in those methods/services, we might choose to provide a very basic default implementation which simply drops any scheme and/or authority from the URL, and let customers do white-lists and/or other more sophisticated checks as customizations.

References:

[0] https://svn.apache.org/repos/asf/sling/trunk/bundles/auth/core/src/main/java/org/apache/sling/auth/core/AuthUtil.java
[1] https://svn.apache.org/repos/asf/sling/trunk/contrib/extensions/security/impl/ReferrerFilter.java


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