The University of Nebraska-Lincoln has deployed an LDAP Directory containing information about UNL faculty, staff and students.
To request access, complete the following PDF and submit it to the Identity Management Team.
The following terms describe the structure of the directory, as defined in Wikipedia :
- A directory is a tree of directory entries
- An entry consists of a set of attributes
- An attribute has a name (an attribute type or attribute description) and one or more values. The attributes are defined in a schema. (Each entry may have a different schema.)
- Each entry has a unique identifier: its Distinguished Name (DN). This consists of its Relative Distinguished Name (RDN) constructed from some attribute(s) in the entry, followed by the parent entry's DN.
Roles and groups are defined in Practices in Directory Groups http://middleware.internet2.edu/dir/groups/draft-internet2-mace-dir-groups-best-practices-01.html.1
Do we, and if so, how do we distinguish future hires? Attribute or group? Do we distinguish enrolled from eligible to enroll? Attribute or group? Need to consider eduPersonScopedAffiliation. e.g. firstname.lastname@example.org Please note that users may have multiple roles (eg. a faculty member who is also a student).
Persons in SAP, holding an active faculty appointment (at UNL)2
Persons in SAP, holding an active staff appointment
Persons in SIS, indicated as eligible to enroll
Persons in SAP, holding an active affiliate appointment
Guest role and mechanism are still under development.
Phase 1 of implementing guest access will focus on the development of a "Sponsored Guest" role. Testing for the Guest role and mechanism will take place during the Spring Term of the 2008/09 Academic Year. As currently defined, creation of a Sponsored Guest will be initiated by the sponsoring UNL faculty or staff member. Guest username will be the guest's email address (after the address is confirmed by the guest).
- Sponsored Guests will be available in Identity Management for a period of 6 months, and are allowed one renewal (by a sponsor) for another 6 month period. If a guest user continues to need access beyond two 6-month periods, it constitutes a long-term relationship with UNL, and they need to be entered as an SAP Affiliate or another more appropriate role
- An automatically-generated email will be sent to the sponsor one month prior to the expiration of the Sponsored Guest account
We're exploring tools for delegating group management. Grouper http://middleware.internet2.edu/dir/groups/grouper/ is an example.
Entries in the directory are organized into organizational units (OUs). The directory is mostly flat, with accounts grouped in OUs by broad type:
|Organizational unit (OU)||Status||Description|
|people||available||UNL faculty, staff, students, and affiliates|
|service||internal use||Service accounts|
The following is an overview of the attributes available for entries in the people OU. Table lists the attributes common to all people. Table and table list attributes for entries from the HR and SIS systems. Currently, persons with multiple roles will have multiple entries. For example, Joe Smith is a faculty member, as well as a student. He would have two accounts, possibly jsmith2 with a faculty role and s-jsmith1 with a student role.
Table 1: People, common attributes
|cn||available||"Joe Smith", "Joe B Smith"|
|displayName||available||Joe B Smith|
|unlAuthority||available||"SIS" or "Human Resources"|
|unlGender||available||"M" or "F"|
|unlPrimaryAffiliation||available||"faculty", "staff", "student", or "affiliate"|
- In the future, we will be putting the published email address into the "mail" attribute (currently called alias). The actual delivery address will be stored in "mailRoutingAddress". Alternate addresses (currently called nicknames) for the person will be stored in mailAlternateAddress.
Table 2: People, HR attributes
|postalAddress||available||29 SEC UNL 68588-0657|
|street||available||29 SEC UNL 68588-0657|
|unlHRAddress||available||29 SEC UNL 68588-0657|
- With improved HR data, we will be changing the format of "postalAddress" and "street". Attributes to consider include "localityName", "stateOrProvinceName", and "postalCode"
Table 3: People, SIS attributes
|unlSISClassLevel||"FR", "SO", "JR", "SR", "2ND", "GR", "P1" to "P6", "UNC"|
|unlSISCollege||"ANR", "ARH", "ASC", etc. (19 three-character codes)|
|unlSISDegree||"BS", "MS", "JD", etc. (over 80 four-character codes)|
|unlSISLocalAddr1||123 Nowhere Drive|
|unlSISPermAddr1||123 Nowhere Drive|
|unlSISStudentStatus||"eligible", "futureEligible", "registered", "graduated", "pastRegistered", "futureRegistered"|
- Should the local and permanent addresses be a single field with a newline between lines? They are not separate data elements.
Security and confidentiality
Applications directly authenticating users against the directory MUST NOT save credentials. Passwords MUST NOT also be saved in a temporary store, such as cookies or sessions. Passwords MUST exist only in memory while the web request is being processed.4
Applications using non-directory information MUST NOT disclose it to unauthorized parties. This applies to non-directory attributes, as well as any information on individuals who have requested privacy.
Saving directory data
It is strongly RECOMMENDED that only directory information be saved to local servers, along with minimal identifying key information like "NUID." This practice is intended to give software providers data that is as up-to-date as possible, as well as to minimize the number of points at which sensitive data may be compromised.
It is understood that other information may be required based on the needs of the software you are using. Please respect the intent of keeping protected data stored in the source (IdM) system whenever possible. Feel free to contact the Identity Management team concerning special needs, questions, or concerns.
Role Hostname Primary ldap.unl.edu Backup ldap-backup.unl.edu Need to add DNS entry for backup server
Secure sockets layer (SSL)
Need a certificate. Get from ipsCA?
Applications using persistent connections MUST set the initial size to one or fewer. The idle timeout MUST be 60 seconds or less. That is, applications may maintain one persistent connection to the directory server, and temporarily create as many additional connections as required. Additional connections that are no longer in use must be closed in 60 seconds. This is to limit the number of unused connections to the directory server. If your application has different requirements, exceptions will be made.
Single sign-on (CAS)
JA-SIG Central Authentication Service (CAS) is a web single sign-on tool. Visit http://login.unl.edu/ for more info on using CAS to authenticate UNL persons accessing your website.
The user is redirected to UNL's Central Authentication Service (CAS) to enter their MyUNL username and password.
OpenID is a decentralized web single sign-on system.
UNL as an IdP (identity provider)
UNL may choose to act as an IdP for OpenID. This would allow UNL community members to authenticate to OpenID protected services. A UNL IdP implementation is not currently on a timeline.
Terms of Service (TOS)
The following resources are well-established at UNL and are RECOMMENDED for establishing Terms of Service for access to your web-based resources:
- Executive Memorandum No. 16: Policy for Responsible Use of University Computers and Information Systems: http://www.nebraska.edu/about/exec_memo16.pdf
- Guidelines for Use of Computing Resources at UNL: http://www.unl.edu/unlpub/special/compuse/guidelines.shtml
- Digital Millennium Copyright Act (DCMA) of 1998: http://www.copyright.gov/legislation/dmca.pdf