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Subject: [OASIS Issue Tracker] (ODATA-1033) Interoperability issue when using escaped slash/backslash in URLs


Evan Ireland created ODATA-1033:
-----------------------------------

             Summary: Interoperability issue when using escaped slash/backslash in URLs
                 Key: ODATA-1033
                 URL: https://issues.oasis-open.org/browse/ODATA-1033
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: OData URL Conventions
    Affects Versions: V4.0_OS
            Reporter: Evan Ireland
            Priority: Minor


We have encountered issues with Tomcat servers handling %-encoded slashes (and backslashes) in URLs. In particular, even when getting URL using HttpServletRequest.getRequestURI (which shouldn't do URL decoding) a percent-encoded backslash (e.g. in a quoted string within the URL) will appear in the result of getRequestURI as a forward slash.

Now Tomcat apparently offers an option to permit this, but...

According to http://stackoverflow.com/questions/9719224/coding-forward-and-backward-slashes-in-tomcat-7

*Do not enable non-standard parsing of the URI. Disabled by default, but still in the application for backwards compatibility reasons are two system properties, org.apache.catalina.connector.CoyoteAdapter.ALLOW_BACKSLASH and org.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH, that allow non-standard parsing of the URI. These properties significantly improve your chances of a directory traversal attack and are therefore strongly recommended to avoid using.*

If correct handling of URLs requires the use of web server configurations that are strongly recommended against for security reasons, we might want to consider what recommendations/accommodations should be made in the OData specification to ensure end-to-end interoperability of strings containing 'special' characters.




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