EFA Policy Assertion SAML2 Binding

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EFA Policy Assertion SAML2 Binding
EFA Policy Assertion SAML2 Binding
Implementierungsleitfaden
vorgelegt von:
February 2013
Jörg Caumanns, Raik Kuhlisch
Draft
Version: 0.9
Datum: March 2013
Status: xxx
Verfahren: {{{Verfahren}}}
Realm: Flag de.svg Deutschland
Copyright © 2012-2013: HL7 Deutschland


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SAML 2.0 Profile for ECR Policy Assertions

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Information icon.svg This profile applies to scenarios where the eCR Context Manager requests an Access Policy Assertion from the eCR Policy Provider and thus implements a policy push authorization model. There is no specification in the case that the Authorization Decision Provider requests policies from the eCR Policy Provider.
Assertion Element Opt Usage Convention
@Version R MUST be “2.0”
@ID R URN encoded unique identifier (UUID) of the assertion
@IssueInstant R Time instant of issuance in UTC
Issuer R Address URI that identifies the endpoint of the issuing service
Subject R This element defines the subject confirmation method of the user in order to use the Policy Assertion as a supporting token. Moreover, it defines the subject name identifier that accords with the user identity from an Identity Assertion.
NameID R Identifier of the HP given in the Identity Asstertion encoded as an X.509 subject name, an e-Mail address or as a string value (unspecified format). Only identifiers must be used that can be long-term tracked back to an individual person.
@Format R MUST be urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified

or urn:oasis:names:tc:SAML:1.1:nameid-format:X509SubjectName
or urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress
For providing an OID as a subject identifier the unspecified format must be used. The OID must be provided as a string encoded in ISO format.

SubjectConfirmation R
@Method R This element MUST hold a URI reference that identifies a protocol to be used to authenticate the subject.[SAML2.0core] The value of this element MUST be set to

urn:oasis:names:tc:SAML:2.0:cm:holder-of-key

SubjectConfirmationData R
ds:KeyInfo R The XML Signature [XMLSignature] element MUST embed a cryptographic key that is only held by the user. This can be the user’s public key (ds:KeyValue/ds:RSAKeyValue), the complete user’s X.509 certificate (ds:X509Data/ds:X509Certificate), or an encrypted symmetric key (xenc:EncryptedKey [XMLEncryption]). This symmetric key MUST be encrypted by using the public key of the consumer service’s certificate [eFA PKI 1.2].
Conditions R
@NotBefore R time instant from which the assertion is useable. This condition MUST be assessed by the assertion consumer to proof the validity of the assertion.
@NotOnOrAfter R Time instant at which the assertion expires. This condition MUST be assessed by the assertion consumer to proof the validity of the assertion. The maximum validity timespan for a Policy Assertion MUST NOT be more than 4 hours.
XACMLPolicyStatement R
PolicySet R PolicySet that expresses the given authorization (see section below for details).
ds:Signature R Enveloped XML signature of the issuer of the Policy Assertion (see section below for details).

PolicySet Profile

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The ECR 2.0 specification differentiates three kinds of an authorization statement as it is described logically in the security token services section for the Policy Provider. These are:

  • Reference without semantics (policyId) to an access policy which contains the valid authorization rules for an eCR Consumer
  • Reference with semantics (e.g., as per IHE BPPC)
  • Access policy which contains the valid authorization rules for an eCR Consumer

In order to implement such differentiations the <PolicySet> element has different sub-elements.

Policy Assignment

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PolicySet Element Opt Usage Convention
@PolicySetId R UUID or OID of the policy set. The value MUST NOT be URN encoded.
@PolicyCombiningAlgId R This attribute is REQUIRED. Its value is a predefined identifier of the policy-combining algorithm for this policy set (see Appendix C and section B.10 in [XACML2.0Core]). The identifier urn:oasis:names:tc:xacml:1.0:policy-combining-algorithm:deny-overrides MUST be used.
Target R This element is used to specify the resource match (i.e., purpose)
Subjects R This element contains one xacml:Subject element.
Subject R It contains one xacml:SubjectMatch element.
SubjectMatch R It defines matches of the subject attributes.
@MatchId R Its value specifies the matching function. The identifier must refer to the subject nameID format of the Identity Assertion. The following list defines the used identifier for this policy (see Section 7.5 in [XACML2.0Core]):
AttributeValue R It defines the subject value for matching depending on the subject match id format.
@DataType R Its value is either http://www.w3.org/2001/XMLSchema#string, urn:oasis:names:tc:xacml:1.0:data-type:x500Name, or urn:oasis:names:tc:xacml:1.0:data-type:rfc822Name that corresponds to the subject match.
SubjectAttributeDesignator R It defines the designator of a resource attribute.
@SubjectCategory O It specifies the categorized subject from which to match named subject attributes. If set, it MUST have the value urn:oasis:names:tc:xacml:1.0:subject-category:access-subject.
@AttributeId R The value of this attribute is set to urn:oasis:names:tc:xacml:1.0:subject:subject-id.
@DataType R Its value is either http://www.w3.org/2001/XMLSchema#string, urn:oasis:names:tc:xacml:1.0:data-type:x500Name, or urn:oasis:names:tc:xacml:1.0:data-type:rfc822Name that corresponds to the subject match.
Resources R This element contains one xacml:Resource element.
Resource R It contains one xacml:ResourceMatch element.
ResourceMatch R It defines matches of the resource attributes.
@MatchId R Its value specifies the matching function. The identifier urn:oasis:names:tc:xacml:2.0:function:anyURI-regexp-match is defined to use regular expressions (see A.3.13 in [XACML2.0Core]).
AttributeValue R It defines the regular expression for matching.
@DataType R Its value is http://www.w3.org/2001/XMLSchema#string to indicate that the attribute value is of string simple type.
ResourceAttributeDesignator R It defines the designator of a resource attribute.
@AttributeId R It specifies the identifier of the attribute that is used for matching. The value of this attribute is set to urn:oasis:names:tc:xacml:1.0:resource:resource-id.
@DataType R It specifies the type of the values that the resource attribute designator returns. The value of this attribute is set to http://www.w3.org/2001/XMLSchema#anyURI.
PolicySetIdReference R Its value either references an assigned access policy that is expressed in a separate XACML PolicySet or already expresses the given authorization.

Policy Attachment

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It is implementation-specific how the PolicySet with the authorization rules is defined - there are no restrictions made. However, there MUST NOT be used further PolicyIdReference or PolicySetIdReference elements.

Assertion Signature

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Every Policy Assertion MUST be signed by its issuer. The XML signature MUST be applied by using the saml:Assertion/ds:Signature element as defined below.

Signature Parameter Usage Convention
CanonicalizationMethod SHOULD be http://www.w3.org/2001/10/xml-exc-c14n#
Transformation Enveloped signature transform acc. to section 6.6.4 of [W3C XMLDSig] SHOULD be used (http://www.w3.org/2000/09/xmldsig#enveloped-signature). In addition, exclusive canonicalization SHOULD be defined as transformation (http://www.w3.org/2001/10/xml-exc-c14n#, acc. [W3C XMLDSig] and [W3C XML-EXC 1.0]). As inclusive namespaces other prefixes than the ones defined in EFA Namespaces MUST NOT be used.
SignatureMethod For signing assertions the signature method

http://www.w3.org/2001/04/xmldsig-more#rsa-sha256 or
http://www.w3.org/2000/09/xmldsig#rsa-sha1
SHOULD be used. An assertion consumer MAY reject signatures that use SHA-1 for digesting.

DigestMethod For signing assertions the digest method

http://www.w3.org/2000/09/xmldsig#sha1 or
http://www.w3.org/2001/04/xmlenc#sha256
SHOULD be used. An assertion consumer MAY reject SHA-1 digests.

KeyInfo This element MUST either contain a wsse:SecurityTokenReference element which references the X.509 certificate of the assertion’s issuer by using a subject key identifier OR contain a ds:X509Data element which contains the X.509 certificate of the assertion issuer.

Example Assertion

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 <soap12:Envelope … >
 <soap12:Header … >
  <wsse:Security … > 
   <saml:Assertion xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
     ID="uuid-6dbb391c-20d3-4568-8c04-ff9d91d049c1" 
     IssueInstant="2013-04-05T08:14:28.788Z" Version="2.0">
   <saml:Issuer>urn:de:berlin:hp:pap</saml:Issuer>
    <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
     <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="#urn:uuid:7102AC72154DCFD1F51253534608780">
        <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#">
          <ec:InclusiveNamespaces 
           xmlns:ec="http://www.w3.org/2001/10/xml-exc-c14n#" 
           PrefixList="ds saml xs" />
         </ds:Transform>
        </ds:Transforms>
        <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
        <ds:DigestValue>A1LyLvFHRrYaOJ28YVFd3MfKGSI=</ds:DigestValue>
       </ds:Reference>
      </ds:SignedInfo>
      <ds:SignatureValue>ggyn … LQ==</ds:SignatureValue>
      <ds:KeyInfo>
       <ds:X509Data>
        <ds:X509Certificate> … </ds:X509Certificate>
       </ds:X509Data>
      </ds:KeyInfo>
     </ds:Signature>
     <saml:Subject>
      <saml:NameID 
       Format="urn:oasis:names:tc:SAML:1.1:nameid-format:X509SubjectName">
       ...
      </saml:NameID>
      <saml:SubjectConfirmation 
       Method="urn:oasis:names:tc:SAML:2.0:cm:holder-of-key">
       <saml:SubjectConfirmationData>
         <ds:KeyInfo>
           <ds:X509Data>
             <ds:X509Certificate> … </ds:X509Certificate>
           </ds:X509Data>
         </ds:KeyInfo>
        </saml:SubjectConfirmationData/>
      </saml:SubjectConfirmation>
     </saml:Subject>
     <saml:Conditions 
      NotBefore="2013-04-05T08:14:28.788Z" 
      NotOnOrAfter="2013-04-05T12:14:28.788Z">
    </saml:Conditions>
    <xacml-saml:XACMLPolicyStatement>
      <xacml:PolicySet>
        <xacml:Target>
          <xacml:Subjects>
             <xacml:Subject>
               <xacml:SubjectMatch MatchId="urn:oasis:names:tc:xacml:1.0:function:x500Name-equal">
                 <xacml:AttributeValue 
                   DataType="http://www.w3.org/2001/XMLSchema#string">CN= ...</AttributeValue>
                 <xacml:SubjectAttributeDesignator 
                   AttributeId="urn:oasis:names:tc:xacml:1.0:subject:subject-id" 
                   DataType="urn:oasis:names:tc:xacml:1.0:data-type:x500Name"/>
               </xacml:SubjectMatch>
             </xacml:Subject>
           </xacml:Subjects>
           <xacml:Resources>
             <xacml:Resource>
               <xacml:ResourceMatch MatchId="urn:oasis:names:tc:xacml:2.0:function:anyURI-regexp-match">
                 <xacml:AttributeValue 
                   DataType="http://www.w3.org/2001/XMLSchema#string">...</AttributeValue>
                 <xacml:ResourceAttributeDesignator 
                   AttributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-id"
                   DataType="http://www.w3.org/2001/XMLSchema#anyURI"/>
               </xacml:ResourceMatch>
             </xacml:Resource>   
           </xacml:Resources>
         </xacml:Target>
         <xacml:PolicySetIdReference>urn:ecr:names:xacml:2.0:default:policyid:permit-all</xacml:PolicySetIdReference>
       </xacml:PolicySet>
      </xacml-saml:XACMLPolicyStatement>
 </saml:Assertion>
</wsse:Security>
</soap12:Header>
<soap12:Body/>
</soap12:Envelope>

Querverweise und Referenzen

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