Impersonation / Surrogate-Authentication

[Matthew Gordon]

I am using only LDAP (AD) as my attribute repository.

https://apereo.github.io/cas/6.5.x/authentication/Surrogate-Authentication.html#surrogate-principal-resolution

I am trying to get it to resolved the impersonated users attributes, but no luck.

It appears that I have to have a groovy script: cas.authn.surrogate.principal.principal-transformation.groovy.location=

Here is my config so far:

cas.authn.surrogate.json.location=file:/etc/cas/config/impersonations.json
cas.authn.surrogate.principal.attribute-resolution-enabled=true
cas.authn.surrogate.principal.active-attribute-repository-ids=core
cas.authn.surrogate.principal.principal-resolution-conflict-strategy=last
cas.authn.surrogate.principal.principal-resolution-failure-fatal=true

If I do need the groovy script, which since it appears to be required, what should it be doing? Any examples?

I can login and the impersonation works, but without attributes it's pretty useless.

Thank you,

Matt

[Jonathon Taylor]

Not sure if this helps, but we use impersonation with LDAP and we did not have to use a groovy script.  We are on 6.5.8.  Here's an example of our configuration:

cas.authn.surrogate.ldap.ldap-url=ldap://<ldap_server>

cas.authn.surrogate.ldap.base-dn=.....

# this filter gets the attributes of the account being impersonated

cas.authn.surrogate.ldap.search-filter=(&(objectClass=eduPerson)(|(cn={0})))

cas.authn.surrogate.ldap.bind-dn=<bind_dn>

cas.authn.surrogate.ldap.bind-credential=<bind_pwd>

cas.authn.surrogate.ldap.use-start-tls=true

# this is the format of the group that a person has to be in

# in order to impersonate the 'surrogate'

cas.custom.properties.surrogate-format=cn=group-{surrogate}

# this builds the list of authorized accounts for impersonation

cas.authn.surrogate.ldap.surrogate-search-filter=(&(cn={user})(isMemberOf=${cas.custom.properties.surrogate-format}))

cas.authn.surrogate.ldap.member-attribute-name=isMemberOf

# this extracts the 'friendly' name of the account to be impersonated

cas.authn.surrogate.ldap.member-attribute-value-regex=cn=group-([^,]+)

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[Matthew Gordon]

Thank you Jonathon. I will have to look at doing it via LDAP. I was just trying to do it via a local JSON file. Is that the entirety of your surrogate config?

Thank you,

Matt

[Matthew Gordon]

Also does it return the surrogate users attributes, or the authenticated users attributes?

Thank you,

Matt

[Jonathon Taylor]

Hi Matt,

That is the entirety of our surrogate configuration.  CAS will return the surrogate user attributes, not the authenticated user. 

Jonathon

[Matthew Gordon]

Thank you Jonathon.

[Jeffrey Ramsay]

Try this as well.

https://fawnoos.com/2018/05/07/cas-impersonation-authn/

-Jeff

To view this discussion on the web visit https://groups.google.com/a/apereo.org/d/msgid/cas-user/e180d6e6-67c7-4d6d-80d3-4ae0f176143dn%40apereo.org.

[Matthew Gordon]

Thank you both for the help! I was able to get it working, albeit with the REST version rather than LDAP. The JSON version would probably work as well.

#========================================
# LDAP ATTRIBUTE REPOSITORY
#========================================
cas.person-directory.active-attribute-repository-ids=attributes
cas.person-directory.attribute-resolution-enabled=true
cas.person-directory.principalAttribute=sAMAccountName
cas.person-directory.return-null=false
cas.person-directory.principal-resolution-failure-fatal=true
cas.person-directory.use-existing-principal-id=false
cas.authn.attribute-repository.core.default-attributes-to-release=cn,givenName,sn,displayName,affiliation
cas.authn.attribute-repository.ldap[0].id=attributes
cas.authn.attribute-repository.ldap[0].order=0
cas.authn.attribute-repository.ldap[0].binary-attributes.objectGUID=objectGUID
cas.authn.attribute-repository.ldap[0].attributes.userPrincipalName=userPrincipalName
cas.authn.attribute-repository.ldap[0].attributes.dn=distinguishedName
cas.authn.attribute-repository.ldap[0].attributes.sn=sn
cas.authn.attribute-repository.ldap[0].attributes.cn=cn
cas.authn.attribute-repository.ldap[0].attributes.givenName=givenName
cas.authn.attribute-repository.ldap[0].attributes.sAMAccountName=sAMAccountName
cas.authn.attribute-repository.ldap[0].attributes.displayName=displayName
cas.authn.attribute-repository.ldap[0].attributes.memberOf=memberOf
cas.authn.attribute-repository.ldap[0].connectTimeout=PT3S
cas.authn.attribute-repository.ldap[0].baseDn=[base_dn]
cas.authn.attribute-repository.ldap[0].subtreeSearch=true
cas.authn.attribute-repository.ldap[0].searchFilter=(sAMAccountName={user})
cas.authn.attribute-repository.ldap[0].bindDn=[bind_user]
cas.authn.attribute-repository.ldap[0].bindCredential=[bind_password]
cas.authn.attribute-repository.ldap[0].ldap-url=[ldap_url]


#========================================
# Impersonation / Surrogate Authentication
#========================================
cas.authn.surrogate.rest.url=[url]
cas.authn.surrogate.principal.active-attribute-repository-ids=attributes
cas.authn.surrogate.principal.attribute-resolution-enabled=true
cas.authn.surrogate.principal.principal-attribute=sAMAccountName
cas.authn.surrogate.principal.principal-resolution-failure-fatal=true