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Fix signature verification #48

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Fix signature verification #48

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a6020eb
Fix signature verification
fauresebast Jul 30, 2025
0d0a03e
Add usage of defined constant for WSSE, update to handle one or multi…
fauresebast Aug 1, 2025
07e8524
Add signature verification of decrypted attachments
fauresebast Aug 7, 2025
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11 changes: 10 additions & 1 deletion lib/akami/wsse/verify_signature.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ def initialize(xml)
def namespaces
@namespaces ||= {
wse: Akami::WSSE::WSE_NAMESPACE,
wsse: 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd',
ds: 'http://www.w3.org/2000/09/xmldsig#',
wsu: Akami::WSSE::WSU_NAMESPACE,
ec: Akami::WSSE::Signature::ExclusiveXMLCanonicalizationAlgorithm,
Expand All @@ -33,7 +34,12 @@ def namespaces

# Returns signer's certificate, bundled in signed document
def certificate
certificate_value = document.at_xpath('//wse:Security/wse:BinarySecurityToken', namespaces).text.strip
signature_certificate_id = document.at_xpath(
'//wse:Security/ds:Signature/ds:KeyInfo/wsse:SecurityTokenReference/wsse:Reference',
namespaces
)['URI'][1..-1] # strip leading '#'

certificate_value = document.at_xpath("//wse:Security/wse:BinarySecurityToken[@wsu:Id=\"#{signature_certificate_id}\"]", namespaces).text.strip
OpenSSL::X509::Certificate.new Base64.decode64(certificate_value)
end

Expand Down Expand Up @@ -67,6 +73,8 @@ def digesters

def verify
document.xpath('//wse:Security/ds:Signature/ds:SignedInfo/ds:Reference', namespaces).each do |ref|
next unless ref.attributes['URI'].value.start_with?('#')

digest_algorithm = ref.at_xpath('//ds:DigestMethod', namespaces)['Algorithm']

transform_inclusive_ns = inclusive_namespaces(ref, './/ds:Transforms/ds:Transform/ec:InclusiveNamespaces')
Expand Down Expand Up @@ -139,6 +147,7 @@ def digester_for_signature_method(algorithm_url)
'http://www.w3.org/2000/09/xmldsig#sha1' => lambda { OpenSSL::Digest::SHA1.new },
# SHA 256
'http://www.w3.org/2001/04/xmldsig-more#rsa-sha256' => lambda { OpenSSL::Digest::SHA256.new },
'http://www.w3.org/2001/04/xmlenc#sha256' => lambda { OpenSSL::Digest::SHA256.new },
# GOST R 34.11-94
# You need correctly configured gost engine in your system OpenSSL, requires OpenSSL >= 1.0.0
# see https://github.com/openssl/openssl/blob/master/engines/ccgost/README.gost
Expand Down
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