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

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

     [ https://issues.oasis-open.org/browse/ODATA-1033?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ralf Handl updated ODATA-1033:
------------------------------

    Environment: Applied  (was: Proposed)
    Component/s: Protocol
                     (was: URL Conventions)

> 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: Protocol
>    Affects Versions: V4.0_OS
>         Environment: Applied
>            Reporter: Evan Ireland
>            Assignee: Ralf Handl
>            Priority: Minor
>             Fix For: V4.01_CSD02
>
>
> 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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