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PKI Policy defines the trusted issuer certificates and CRL/OSCP endpoints used when validating certificates or certificate chains and attributes generated from subject and issuer certificates.

The user's certificate is defined to be included in a SubjectConfirmation of SAML Assertion by defining the Subject element's KeyInfoConfirmationData attribute as true. User's certificate is used by SSO to write the audit log entry “certificate received”.

Attributes to be sent to SSO as SAML Assertion attributes or OpenID Connect id_token claims are defined in the Attributes element. The name of the attribute is defined in the name attribute of the Add element. The content of the attribute is defined in the enclosed elements. In this example the attribute subject.fingerprint is defined as a sha-1 digest (fingerprint) of the certificate and the attribute subject.dn attribute is defined as the subject field (distinguished name) of the certificate.

PKI Policy XML configuration file

An example PKI policy XML configuration file is shown below.

<?xml version="1.0" encoding="iso-8859-1"?>
<Policy 
    xmlns="http://ubisecure.com/schema/certagent.xsd">
  <PKI>
    <Trust crl="ldap://ldap.fineid.fi:389/cn%3dVRK%20Gov.%20CA%20for%20Citizen%20Qualified%20Certificates,ou%3dValtion%20kansalaisvarmenteet,o%3dVaestorekisterikeskus%20CA,dmdName%3dFINEID,c%3dFI?certificateRevocationList??objectClass=cRLDistributionPoint">
      MIIFjDCCBHSgAwIBAgIDAYiZMA0GCSqGSIb3DQEBBQUAMIGjMQswCQYDVQQGEwJG
      STEQMA4GA1UECBMHRmlubGFuZDEhMB8GA1UEChMYVmFlc3RvcmVraXN0ZXJpa2Vz
      a3VzIENBMSkwJwYDVQQLEyBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eSBTZXJ2aWNl
      czEZMBcGA1UECxMQVmFybWVubmVwYWx2ZWx1dDEZMBcGA1UEAxMQVlJLIEdvdi4g
      Um9vdCBDQTAeFw0wMzAxMTAxMjU5MDVaFw0xOTAxMDkxMjU4MzBaMIGhMQswCQYD
      VQQGEwJGSTEQMA4GA1UECBMHRmlubGFuZDEhMB8GA1UEChMYVmFlc3RvcmVraXN0
      ZXJpa2Vza3VzIENBMSQwIgYDVQQLExtWYWx0aW9uIGthbnNhbGFpc3Zhcm1lbnRl
      ZXQxNzA1BgNVBAMTLlZSSyBHb3YuIENBIGZvciBDaXRpemVuIFF1YWxpZmllZCBD
      ZXJ0aWZpY2F0ZXMwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC5Aj52
      7olxDHOtkQQU+BG1FUs0xOy8Qw2z3NmgV7yOkYRwi/C7aAbvaye712q8APGiDa+P
      f0N/XzQNynWWyzC2krv+fQq5YjGypRbnvciAtGbJQSXBoX58eV6sd5CWLKGMo1gH
      xsXNU6L9v9XlSWLUH4xbYvQt+oxfptgJbK5E+71OYC8DL0KU6xmlEfuPNQZ1Rf3p
      qqlEfmQjP24ubcgy3ZAHVTFBh7rT66pw+L5zAVPYBCyUG7rdXHS9hulRa4Y8w3BF
      RBxbChHsc7tuKk9kQmNGhQAJ7CdJx3V5kPsrxnuztOunimeBKoB5X3wgvk9f64n6
      0Jp0qumnY4l9V6oZAgMBAAGjggHHMIIBwzASBgNVHRMBAf8ECDAGAQH/AgEAMBEG
      CWCGSAGG+EIBAQQEAwIBBjCBywYDVR0gBIHDMIHAMIG9BgkqgXaEBQEKAQEwga8w
      gYQGCCsGAQUFBwICMHgadlZhcm1lbm5lcG9saXRpaWtrYSBvbiBzYWF0YXZpbGxh
      IC0gQ2VydGlmaWthdCBwb2xpY3kgZmlubnMgLSBDZXJ0aWZpY2F0ZSBwb2xpY3kg
      aXMgYXZhaWxhYmxlIGh0dHA6Ly93d3cuZmluZWlkLmZpL2NwczEwJgYIKwYBBQUH
      AgEWGmh0dHA6Ly93d3cuZmluZWlkLmZpL2NwczEvMEIGCCsGAQUFBwEBBDYwNDAy
      BggrBgEFBQcwAoYmaHR0cDovL3Byb3h5LmZpbmVpZC5maS9jYS92cmtyb290Yy5j
      cnQwDgYDVR0PAQH/BAQDAgHGMB8GA1UdIwQYMBaAFNvp4ZvS0SQL/KvjoGfqrpxL
      d/SwMDgGA1UdHwQxMC8wLaAroCmGJ2h0dHA6Ly9wcm94eS5maW5laWQuZmkvYXJs
      L3Zya3Jvb3RhLmNybDAdBgNVHQ4EFgQUiFpvHUJHgob91+kNslfPTVAoBBcwDQYJ
      KoZIhvcNAQEFBQADggEBAEXit6ypQO+0RbVTK57SKT1jsqE8dUiwL8oevvdBiFpR
      4HxEZZy8e/OGAvF3Hc/Hjc8cOjlsYToqztg16cOFI4vHZ+yC8rWh4TpuWgvkS80h
      //jcweAayp6E/Z0z928vTNILBD34YJQvpU4u7jyhSaY3tzybKjlSAo5lahiI32a9
      MNZXGoNv+j+MKq1NJkpgpy6/VEa5Z4RdRx43/EZhs45WvxTfER+nUC1loQngFKOS
      jdWG3GhOAh13nM9jYASBtC7ONddvoByfzwUOQ+BOf08R2bvZA+2CDFI8PuYqxCFv
      BMCpQSCdVL6tEYxeWIQb+uIQsfAEfjC3AQuTNh/UiW8=
    </Trust>
  </PKI> 

  <Subject KeyInfoConfirmationData="true"/> 

  <Attributes>
    <!-- SHA-1 fingerprint -->
    <Add name="subject.fingerprint">
      <Digest source="subject" algorithm="sha1" />
    </Add>
    <!-- Subject's distinguished name -->
    <Add name="subject.dn">
      <Field source="subject"/>
    </Add>
  </Attributes>
</Policy>

Trusted issuers are defined in the Trust elements enclosed in a PKI element. The corresponding CRL distribution point is defined in the crl attribute. Other trusted issuers may be added by defining a new Trust element for each trusted issuer.

In addition to certificate path validation tasks, this configuration also defines the contents of the SAML Assertion and OpenID Connect id_token. For example, the user certificate may be included, specific attributes may be extracted from the certificate and relayed back to service provider, a fingerprint of the certificate may be computed with specified message digest algorithm, and several normalization schemes may be applied for extracted attributes.

The structure and data types of the configuration document are described in the following schema.

Schema Explanation

The <Policy/> element

<xs:element name="Policy" type="PolicyType" />
<xs:complexType name="PolicyType">
	<xs:sequence>
		<xs:element ref="PKI" />
		<xs:element ref="Subject" />
		<xs:element ref="Attributes" />
	</xs:sequence>
</xs:complexType>

The policy element defines three required child elements: PKI, Subject and Attributes.

The <PKI/> element

<xs:element name="PKI" type="PKIType" />
<xs:complexType name="PKIType">
	<xs:sequence minOccurs="1" maxOccurs="unbounded">
		<xs:element ref="Trust" />
	</xs:sequence>
</xs:complexType>

The PKI element encapsulates <Trust/> definitions. At least one certificate authority (CA) must be configured.

The <Trust /> element

<xs:element name="Trust" type="TrustType" /> 
<xs:complexType name="TrustType">
	<xs:simpleContent>
		<xs:extension base="xs:base64Binary">
			<xs:attribute name="crl" type="xs:anyURI" />
		</xs:extension>
	</xs:simpleContent>
</xs:complexType>

The <Trust /> element represents a trusted certificate authority. The element contains an attribute defining a CRL distribution URL and the element contains a Base64-encoded certificate.

The <Subject /> element

<xs:element name="Subject" type="SubjectType" />
<xs:complexType name="SubjectType">
	<xs:attribute name="KeyInfoConfirmationData" type="xs:boolean" />
</xs:complexType>

The <Subject /> element contains a Boolean type attribute called KeyInfoConfirmationData which defines whether the client certificate sent to service provider in SAML Assertion or OpenID Connect id_token.

The <Attributes /> element

<xs:element name="Attributes" type="AttributesType" />
<xs:complexType name="AttributesType">
	<xs:sequence minOccurs="0" maxOccurs="unbounded">
		<xs:element ref="Add" />
	</xs:sequence>
</xs:complexType>

The <Attributes/> element is the container for response attributes. Response attributes are defined using the <Add/> directive.

The <Add /> element

<xs:element name="Add" type="AddType" />
<xs:complexType name="AddType">
	<xs:group ref="ValueGroup" />
	<xs:attribute name="name" type="xs:string" use="required" />
</xs:complexType>

This element is used to add response attributes to the assertion. Each <Add/> element can contain one of the child elements defined in ValueGroup.

<xs:group name="ValueGroup">
	<xs:choice>
		<xs:element ref="Attribute" />
		<xs:element ref="Concat" />
		<xs:element ref="Digest" />
		<xs:element ref="Field" />
		<xs:element ref="Text" />
	</xs:choice>
</xs:group>

The <Attribute /> element

<xs:element name="Attribute" type="AttributeType" />
<xs:complexType name="AttributeType">
	<xs:complexContent>
		<xs:attribute name="source" type="SourceAttributeType" use="required" />
		<xs:attribute name="oid" type="xs:string" use="required" />
	</xs:complexContent>
</xs:complexType>

The <Attribute /> element contains the source and OID attributes. OID-element represents an object identifier and the source defines if the OID is looked up from the distinguished name of the subject or the issuer.

The <Concat /> element

	<xs:element name="Concat" type="ConcatType" />
	<xs:complexType name="ConcatType">
		<xs:complexContent>
			<xs:group ref="ValueGroup" maxOccurs="unbounded" />
		</xs:complexContent>
	</xs:complexType>

The <Concat/> element concatenates information defined by elements of the ValueGroup definition. Each defined element is individually parsed to a textual representation and concatenated with each other to form a single string.

<xs:group name="ValueGroup">
	<xs:choice>
		<xs:element ref="Attribute" />
		<xs:element ref="Concat" />
		<xs:element ref="Digest" />
		<xs:element ref="Field" />
		<xs:element ref="Text" />
	</xs:choice>
</xs:group>

The <Digest /> element

<xs:element name="Digest" type="DigestType" />
<xs:complexType name="DigestType">
	<xs:complexContent>
		<xs:attribute name="source" type="SourceAttributeType" use="required" />
		<xs:attribute name="algorithm" use="required">
			<xs:simpleType>
				<xs:restriction base="xs:string">
					<xs:enumeration value="md5" />
					<xs:enumeration value="sha1" />
				</xs:restriction>
			</xs:simpleType> 
		</xs:attribute>
	</xs:complexContent>
</xs:complexType>

The <Digest /> element computes the hash of either the client's or CA's certificate. Allowed algorithms are md5 or sha-1, defined with the strings "md5" or "sha1".

The <Field /> element

<xs:element name="Field" type="FieldType" /> 
<xs:complexType name="FieldType">
<xs:complexContent>
<xs:attribute name="source" type="SourceAttributeType" use="required" />
<xs:attribute name="normalize" type="xs:string" use="optional" />
</xs:complexContent>
</xs:complexType>

The <Field /> element allows submitting either the subject's or CA's distinguished name. The names' string representations are, by default, serialized by the JDK X500Principal.toString() –method. The normalization routine can be controlled by defining one of the following values:

Value

Description

RFC1779

http://java.sun.com/j2se/1.5.0/docs/api/javax/security/auth/x500/X500Principal.html#getName(java.lang.String)
This value is case insensitive

RFC2253

http://java.sun.com/j2se/1.5.0/docs/api/javax/security/auth/x500/X500Principal.html#getName(java.lang.String)
This value is case insensitive

CANONICAL

http://java.sun.com/j2se/1.5.0/docs/api/javax/security/auth/x500/X500Principal.html#getName(java.lang.String)
This value is case insensitive

altSecurityIdentities

https://msdn.microsoft.com/en-us/library/ms675221(v=vs.85).aspx
This value is case sensitive. The normalization routine features reversing the subject's and issuer's DNs, replacing DN component names by a certain scheme and finally concatenating them to the form "<I>issuer dn<S>subject dn"
The component name normalization scheme (Active Directory with Windows 2003 Service Pack 1)

OID.2.5.4.3=CN 
OID.2.5.4.6=C 
OID.2.5.4.7=L 
OID.2.5.4.8=S 
OID.2.5.4.10=O 
OID.2.5.4.11=OU 
OID.2.5.4.12=T 
OID.2.5.4.4=SN 
OID.2.5.4.42=G 
OID.2.5.4.5=SERIALNUMBER

The <Text /> element

<xs:element name="Text" type="TextType" />
<xs:complexType name="TextType">
	<xs:complexContent>
		<xs:attribute name="content" type="xs:string" />
	</xs:complexContent>
</xs:complexType>

This element can be used to include arbitrary text in the response attributes or use the text in concatenation with other elements.

The source attribute

<xs:simpleType name="SourceAttributeType">
    <xs:restriction base="xs:string">
        <xs:enumeration value="subject" />
        <xs:enumeration value="issuer" />
    </xs:restriction>
</xs:simpleType>

The value of source attribute for Attribute, Field and Digest elements can be either subject or issuer. It denotes the source certificate for the element being either the subject certificate, or the issuer of subject certificate.

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