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[xsl] Including/importing digitally signed XSLT documents?

2010-05-21 11:21:45
Hi Folks,

Imagine an XSLT program that uses <xsl:include> to gain access to an XSLT 
document from an external location (say, a W3C XSLT document). It wouldn't be 
difficult for an evil person to intercept the ensuing message exchange and 
return an XSLT document designed to disrupt the proper functioning of the 
original XSLT program, perhaps even resulting in a denial of service. 

One approach to prevent this would be to digitally sign the included XSLT 
document. Of course, it would be horrific if the XSLT programmer had to write 
code to check the digital signature of every XSLT document he includes/imports. 

I envision XSLT processors automatically checking the digital signatures and 
triggering an error to the XSLT programs if the digital signatures fail. Thus, 
the checking is transparent to the XSLT programmer. 

Are there any plans to provide this functionality in XSLT 2.1? 

What other approaches are there for ensuring the safe include/import of XSLT 
documents at external locations?

/Roger

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