InCommon Federation
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Overview

sn is a user attribute defined in RFC4519→ (Lightweight Directory Access Protocol (LDAP): Schema for User Applications). From RFC4519: "The sn (surname in X.500) attribute type contains name strings for the family names of a person."


OID2.5.4.4
LDAP Syntax

Directory String

# of Valuesmulti-valued
ReferenceseduPerson→, RFC4519→

Use in the InCommon Federation

sn is commonly used to transmit a person's last (family) name. Some IdPs may send multiple permutations of the person's name in the givenName attribute.

sn, in conjunction with givenName, satisfies the REFEDS Research & Scholarship (R&S) entity category's requirement for person name.

SAML Response Example

<samlp:Response xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"         
                xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" 
                ID="..." Version="2.0" IssueInstant="2020-07-17T01:01:48Z" 
                Destination="...." InResponseTo="...">
 ...
 <saml:Assertion ...>
  ...
   <saml:AttributeStatement>
    <saml:Attribute xmlns:x500="urn:oasis:names:tc:SAML:2.0:profiles:attribute:X500"
                    NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
                    Name="urn:oid:2.5.4.4" 
                    FriendlyName="sn"
                    x500:Encoding="LDAP">
      <saml:AttributeValue xsi:type="xsd:string">El-Kabany</saml:AttributeValue>
   </saml:Attribute>
   ...
   </saml:AttributeStatement>
 </saml:Assertion>
</samlp:Response>


See Also



Working with user data

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