EFA Policy Assertion SAML2 Binding

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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
  • 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 at least 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 refers to the subject nameID format of the Identity Assertion. The following list defines the used matching functions (see Section 7.5 in [XACML2.0Core]):

Alternatively, the following HCP attributes MAY be used:

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 If the nameID is provided for the XACML subject, then the value of this attribute is set to urn:oasis:names:tc:xacml:1.0:subject:subject-id. Otherwhise the following attribute IDs SHALL be used:
@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:hl7-org:v3:function:CV-equal (see IHE DE Cookbook, XACML Binding).
AttributeValue R It defines the regular expression for matching.
@DataType R SHALL be urn:hl7-org:v3#CV.
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:ihe:iti:xds-b:2007:folder:code.
@DataType R It specifies the type of the values that the resource attribute designator returns. The value of this attribute is set to urn:hl7-org:v3#CV (HL7v3 "Coded Value" data type, see HL7v3 Abstract Data Type Specification - ANSI/HL7 V3 DT, R1-2004 11/29/2004; section 2.9). This custom data type holds a code and its associated code system using the following format: code@code-system. Example: <CodedValue code="ECR" codeSystem="IHE-D-Cookbook-FolderClassCode" /> is mapped to "ECR@IHE-D-Cookbook-FolderClassCode".
ResourceMatch R Defines the matches of the patient ID.
@MatchId R Its value specifies the matching function. The identifier urn:hl7-org:v3:function:II-equal (see IHE DE Cookbook, XACML Binding).
AttributeValue R It defines the regular expression for matching.
@DataType R SHALL be urn:hl7-org:v3#II.
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:ihe:iti:xds-b:2007:patient-id.
@DataType R It specifies the type of the values that the resource attribute designator returns. The value of this attribute is set to urn:hl7-org:v3#II (see IHE DE Cookbook, XACML Binding).
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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The ECR's lifecycle is represented by means of interaction patterns and communication patterns. These patterns are bound to XACML actions. The following XACML Action element SHALL be used in a separate XACML Policy which shares the definition of the Policy Assignment.

Policy Element Opt Usage Convention
@PolicyId R UUID or OID of the policy. The value MUST NOT be URN encoded.
@RuleCombiningAlgId R This attribute is REQUIRED. Its value is a predefined identifier of the rule-combining algorithm for this policy (see Appendix C and section B.10 in [XACML2.0Core]). The identifier urn:oasis:names:tc:xacml:1.0:rule-combining-algorithm:deny-overrides MUST be used.
Target R This element is used to specify the resource match (i.e., purpose)
Subjects R see Policy Assignment
Resources R see Policy Assignment
Actions R This element contains at least one xacml:Action element.
Action R It contains one xacml:ActionMatch element.
ActionMatch R It defines matches of the action attributes.
@MatchId R Its value specifies the matching function. The following matching function SHALL be used:

urn:oasis:names:tc:xacml:1.0:function:string-equal

AttributeValue R It defines the action value for matching depending on the action match id format. The action value refers to the EFA transaction as defined in EFA Audit Trail Binding.
@DataType R The value of this attribute is set to urn:hl7-org:v3#CV (HL7v3 "Coded Value" data type, see HL7v3 Abstract Data Type Specification - ANSI/HL7 V3 DT, R1-2004 11/29/2004; section 2.9). This custom data type holds a code and its associated code system name using the following format: code@code-system-name. Example: <CodedValue code="EFA-01" codeSystem="EFAv2 Transaction" /> is mapped to "ECR-01@EFAv2 Transaction".
ActionAttributeDesignator R It defines the designator of a resource attribute.
@AttributeId R The following attribute ID SHALL be used:

urn:oasis:names:tc:xacml:1.0:action:action-id

@DataType R Its value is http://www.w3.org/2001/XMLSchema#string that corresponds to the action match.

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>



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