[xmlsec] xmlsec1 can't verify a signature (problem with --id-attr or --node-id ?)
pfx
pf.prologue at gmail.com
Mon Nov 10 07:32:51 PST 2014
I'm not sure ... Even if the signature is not valid, xmlsec can displays
the PreDidest data
After a lot of debug, I found the reason (but not the solution)
The file I want to check is strange ...
It contains 2 references in <ds:SignedInfo>
The first reference is correct (#B01201438 references an id of a parent
element)
<ds:Reference URI="#B01201438">
<ds:Transforms>
<ds:Transform
Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
<ds:Transform
Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
</ds:Transforms>
[...]
The second reference also contains a <ds:Transform
Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
(#IDC1141029105704p0100_SP references a Xades SignedProperties element
=> Signature/Object/QualifyingProperties/SignedProperties, therefore
it's a child element of ds:Signature)
<ds:Reference URI="#IDC1141029105704p0100_SP">
<ds:Transforms>
<ds:Transform
Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
<ds:Transform
Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
</ds:Transforms>
[...]
When xmlsec processes this reference, the output of C14N is empty
If I remove the <ds:Transform
Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>, the
output of C14N is correct
my knowledge is that "enveloped-signature" removes the node "Signature"
from the tree of signed data
I do not understand the side effect of "enveloped-signature". In the
best case, xmlsec should ignore the additional <ds:Transform ...
enveloped-signature"/> (ie returns the whole sub tree)
what is your opinion ?
Le 07/11/2014 17:25, Aleksey Sanin a écrit :
> Well, according to the output.txt file, xmlsec simply stops on the
> first failed Reference element since the signature will not be valid
> anyway (see while() loop at the end of the
> xmlSecDSigCtxProcessSignedInfoNode() function).
>
> Aleksey
>
> On 11/7/14 4:31 AM, pfx wrote:
>> Hi!
>>
>> I have a signed xml file with Xades information
>> I try to verify the signature with:
>>
>> $ xmlsec1 --verify --id-attr:Id Bordereau --id-attr:Id Signature
>> --id-attr:Id SignedProperties --node-id IDC1141029105800p0100 test.xml
>> func=xmlSecOpenSSLEvpDigestVerify:file=digests.c:line=229:obj=sha1:subj=unknown:error=12:invalid
>> data:data and digest do not match
>> FAIL
>> SignedInfo References (ok/all): 1/2
>>
>> The first part of the signature is validate by xmlsec1
>> but it seems that xmlsec1 can't access to the second part (Xades
>> information)
>>
>> If I use the "--store-references" flags, I can see the "PreDigest data"
>> of the first part, but xmlsec1 never displays the "PreDigest data" of
>> the second part
>>
>> Here an extract of the file
>> <Bordereau Id="*B01201462*">
>> <BlocBordereau>
>> ...
>> <ds:Signature Id="IDC1141029105800p0100">
>> <ds:SignedInfo>
>> <ds:CanonicalizationMethod
>> Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
>> <ds:SignatureMethod
>> Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
>> <ds:Reference URI="#*B01201462*">
>> <ds:Transforms>
>> <ds:Transform
>> Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
>> <ds:Transform
>> Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
>> </ds:Transforms>
>> <ds:DigestMethod
>> Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
>>
>> <ds:DigestValue>m24cE8pHsEwYBbVnCcUGUT49i3g=</ds:DigestValue>
>> </ds:Reference>
>> <ds:Reference URI="#*IDC1141029105800p0100_SP*">
>> <ds:Transforms>
>> <ds:Transform
>> Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
>> <ds:Transform
>> Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
>> </ds:Transforms>
>> <ds:DigestMethod
>> Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
>>
>> <ds:DigestValue>OgLDEJDln8+bp7jX1pxs5j/0poM=</ds:DigestValue>
>> </ds:Reference>
>> </ds:SignedInfo>
>> ...
>> <ds:Object Id="IDC1141029105800p0100_QI">
>> <xad:QualifyingProperties
>> Target="IDC1141029105800p0100">
>> <xad:SignedProperties
>> Id="*IDC1141029105800p0100_SP*">
>> <xad:SignedSignatureProperties>
>>
>> <xad:SigningTime>2014-10-29T09:58:00.191Z</xad:SigningTime>
>> </ds:Signature>
>> </Bordereau>
>>
>> And an extract of the output
>> = REFERENCE VERIFICATION CONTEXT
>> == Status: succeeded
>> == URI: "#B01201462"
>> [...]
>> === uri:
>> === uri xpointer expr: #B01201462
>> === Transform: xpointer
>> (href=http://www.w3.org/2001/04/xmldsig-more/xptr)
>> === Transform: enveloped-signature
>> (href=http://www.w3.org/2000/09/xmldsig#enveloped-signature)
>> === Transform: exc-c14n (href=http://www.w3.org/2001/10/xml-exc-c14n#)
>> === Transform: membuf-transform (href=NULL)
>> === Transform: sha1 (href=http://www.w3.org/2000/09/xmldsig#sha1)
>> === Transform: membuf-transform (href=NULL)
>> == Digest Method:
>> === Transform: sha1 (href=http://www.w3.org/2000/09/xmldsig#sha1)
>> == PreDigest data - start buffer:
>> <Bordereau Id="B01201462"><BlocBordereau><Exer
>> V="2014"></Exer>.........</Bordereau>
>> == PreDigest data - end buffer
>> = REFERENCE VERIFICATION CONTEXT
>> == Status: invalid
>> == URI: "#IDC1141029105800p0100_SP"
>> [...]
>> === uri:
>> === uri xpointer expr: #IDC1141029105800p0100_SP
>> === Transform: xpointer
>> (href=http://www.w3.org/2001/04/xmldsig-more/xptr)
>> === Transform: enveloped-signature
>> (href=http://www.w3.org/2000/09/xmldsig#enveloped-signature)
>> === Transform: exc-c14n (href=http://www.w3.org/2001/10/xml-exc-c14n#)
>> === Transform: membuf-transform (href=NULL)
>> === Transform: sha1 (href=http://www.w3.org/2000/09/xmldsig#sha1)
>> === Transform: membuf-transform (href=NULL)
>> == Digest Method:
>> === Transform: sha1 (href=http://www.w3.org/2000/09/xmldsig#sha1)
>> => No PreDigest data here !
>>
>> where is my mistake ?
>>
>> I use xmlsec 1.2.18 (openssl)
>> (here the full xml file and xmlsec output => http://dl.free.fr/ekDbPkF63)
>>
>> Regards,
>>
>>
>>
>> _______________________________________________
>> xmlsec mailing list
>> xmlsec at aleksey.com
>> http://www.aleksey.com/mailman/listinfo/xmlsec
>>
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