[XML-SIG] Re: bug in c14n.py

Wed, 17 Apr 2002 15:18:19 -0400

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I include a c14n.py that fixes the bug that I speak of below, and a 
test_c14n.py that has a more consistent treatment of the "withComments" 
option, and also permits additional prefixes to be passed as a command line 
parameter under exclusive canonicalization.

However, I also discovered a bug from Gregor's example 1 [a]. Presently, 
c14n.py does the following:
1. takes any xml_attrs (e.g., xml:lang) from previous recursions not 
rendered and adds them to local xml_attrs.
2. if the element we are processing is in the subset, it renders the 
accumulated xml_attrs as part of that element and and resets xml_attrs=[] 
3. it recurses.

This has the effect of rendering all XML attributes that are "in affect" 
since the last ancestor was rendered. Sounds sensible, but it's not correct 
according to the the spec [b]. To fix this, I think we'd have to test 
whether the immediate parent was in the nodeset and keep a dictionary 
(instead of a list) of *all* ancestors' xml:foo attributes (not just since 
the nearest rendered one), with the *nearest* value. (Moving from a list to 
a dictionary is akin to what I did for the namespace bug.) This bug exists 
on in c14n, not exc-c14n. 

[a] 
http://lists.w3.org/Archives/Public/w3c-ietf-xmldsig/2002JanMar/0259.html
[b] http://www.w3.org/TR/2001/REC-xml-c14n-20010315
"The processing of an element node E MUST be modified slightly when an 
XPath node-set is given as input and the element's parent is omitted from 
the node-set. The method for processing the attribute axis of an element E 
in the node-set is enhanced. All element nodes along E's ancestor axis are 
examined for nearest occurrences of attributes in the xml namespace, such 
as xml:lang and xml:space (whether or not they are in the node-set). From 
this list of attributes, remove any that are in E's attribute axis (whether 
or not they are in the node-set)."

On Monday 08 April 2002 17:44, Joseph Reagle wrote:
> I think there's a pretty big bug in c14n.py. I've attached a simple
> example [0] that when run with [1] produces [2]. (I started out thinking
> this was a problem with default namespaces, but it's something else.) I
> don't think e3 should emmit any declaration, but since the ns code only
> compares with pvalue (e2's value for the prefix f is different), it
> incorrectly emits it.
>
> However, I've made lots of tweaks. I wonder if I've introduced this
> error? I've tried to fix it, but I find the ns code rather hard to
> understand. Additionally, I think the solution is to actually keep a
> (stack of) dictionary with rendered prefix and value. ns_rendered will
> need to be a dictionary of rendered ns prefixes and values, not just the
> prefixes.
>
>
>
>
> [0] <?xml version="1.0" encoding="UTF-8"?>
> <e0>
>   <e1 f:xmlns="">
>     <e2 f:xmlns="b">
>       <e3 f:xmlns=""/>
>     </e2>
>   </e1>
> </e0>
>
> [1] test_c14n.py -i egj1.xml -x "(//. | //@* | //namespace::*)[self::e1
> or self::e3]"
>
> [2] <e1 xmlns:f=""><e3 xmlns:f=""></e3></e1>

-- 

Joseph Reagle Jr.                 http://www.w3.org/People/Reagle/
W3C Policy Analyst                mailto:reagle@w3.org
IETF/W3C XML-Signature Co-Chair   http://www.w3.org/Signature/
W3C XML Encryption Chair          http://www.w3.org/Encryption/2001/
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