Re: one RADIUS server per realm setup

I appear to have gotten this working by adding the following to my authorize {} section: 

if (Realm == "localdomain.edu") {
   files
   ldap
   }
Obviously removing the reference to "files" and "ldap" from elsewhere in the authorize section. Then I do LDAP group checking in the users file like this: 

# Allow Students
DEFAULT Ldap-Group == 30

# ...and Staff
DEFAULT Ldap-Group == 40

# ...and Faculty
DEFAULT Ldap-Group == 50

# ...and nobody else!
DEFAULT         Auth-Type := Reject
Reply-Message = "Only current faculty, staff or students are allowed to log in."
...and in radiusd.conf, the following non-default config in the ldap section to establish how to find Ldap-Group: 

               base_filter = "(objectclass=posixAccount)"
               groupname_attribute = gidNumber
groupmembership_filter = "(&(objectClass=posixAccount)(uid=%{Stripped-User-Name}))" 
               groupmembership_attribute = gidNumber
And then I have set up my proxy hosts for other realms (domains) in proxy.conf
This seems to accomplish what I want, which is to check LDAP groups during authorization only if the realm is local.
I'm not sure what the syntax rules for the authorize{} section of the config files are; I was unable to find any description in the docs of how one goes about figuring out how to write these conditional statements. What language is it? It seems C-like, but only kindof. Did I miss this in the documentation? And the only way I could tell that I could use the variable "Realm" is because it was in the debugging output of freeradius. I couldn't find a list of available variables on the wiki, other than http://wiki.freeradius.org/Run-time_variables#Conditional_syntax , which is very incomplete non self-explanatory.
I'm just confused as to how I was supposed to figure all this out without doing what I did, which was bang my head against the wall for a long time. I kinda figured there was some default way I was supposed to be doing what I was doing, but I gave up and did what feels like a "hack" to me. Is it OK? Am I missing a clear place where all of this is described?
This is a fabulous piece of software, and I appreciate its license, its functionality, and its highly-configurable nature, I just feel like I'm missing something :) 

All the best,

   -Josiah



Wm. Josiah Erikson wrote:
I see. I can, indeed, remove Auth-Type := LDAP from the users file and it still works. Cool!
However, the behavior described in the documentation is not what I'm seeing, and I'm still getting (contrary to what I said in my previous email) authorization requests not being proxied, even though I have, in my authorize section, the "suffix" directive previous to "files" and "ldap", which is where I check the LDAP group....
If my realm is @hampshire.edu, everything works as I want it to, because it doesn't proxy. But when I try to authenticate as a fake user in my test proxy realm (I just want to see it try to proxy), it looks in the local LDAP database! Huh? It says it's preparing to proxy <authentication>, as it should... how do I make it either proxy authorization as well, or skip authorization for non-local domains? How should I go about this?
I must be misunderstanding something. I don't want it to do anything locally if I've set it to proxy! I get the following relevant output from freeradius -X: 

Listening on authentication address * port 1812
Listening on accounting address * port 1813
Ready to process requests.
rad_recv: Access-Request packet from host 127.0.0.1 port 34022, id=118, length=66 
       User-Name = "dude@testdomain.edu"
       User-Password = "passwowrd"
       NAS-IP-Address = 172.20.66.104
       NAS-Port = 1
+- entering group authorize
++[preprocess] returns ok
++[chap] returns noop
++[mschap] returns noop
rlm_realm: Looking up realm "testdomain.edu" for User-Name = "dude@testdomain.edu" 
   rlm_realm: Found realm "testdomain.edu"
   rlm_realm: Adding Stripped-User-Name = "dude"
   rlm_realm: Proxying request from user dude to realm testdomain.edu
   rlm_realm: Adding Realm = "testdomain.edu"
rlm_realm: Preparing to proxy authentication request to realm "testdomain.edu" 
++[suffix] returns updated
++[unix] returns notfound
rlm_ldap: Entering ldap_groupcmp()
       expand: dc=hampshire, dc=edu -> dc=hampshire, dc=edu
       expand: (uid=%{Stripped-User-Name}) -> (uid=dude)
rlm_ldap: ldap_get_conn: Checking Id: 0
rlm_ldap: ldap_get_conn: Got Id: 0
rlm_ldap: attempting LDAP reconnection
rlm_ldap: (re)connect to ldap.hampshire.edu:389, authentication 0
rlm_ldap: bind as uid=tu, ou=account, dc=hampshire, dc=edu/tp to ldap.hampshire.edu:389 
rlm_ldap: waiting for bind result ...
rlm_ldap: Bind was successful
rlm_ldap: performing search in dc=hampshire, dc=edu, with filter (uid=dude) 
rlm_ldap: object not found or got ambiguous search result
rlm_ldap::ldap_groupcmp: search failed
rlm_ldap: ldap_release_conn: Release Id: 0
rlm_ldap: Entering ldap_groupcmp()
       expand: dc=hampshire, dc=edu -> dc=hampshire, dc=edu
       expand: (uid=%{Stripped-User-Name}) -> (uid=dude)
rlm_ldap: ldap_get_conn: Checking Id: 0
rlm_ldap: ldap_get_conn: Got Id: 0
rlm_ldap: performing search in dc=hampshire, dc=edu, with filter (uid=dude) 
rlm_ldap: object not found or got ambiguous search result
rlm_ldap::ldap_groupcmp: search failed
rlm_ldap: ldap_release_conn: Release Id: 0
rlm_ldap: Entering ldap_groupcmp()
       expand: dc=hampshire, dc=edu -> dc=hampshire, dc=edu
       expand: (uid=%{Stripped-User-Name}) -> (uid=dude)
rlm_ldap: ldap_get_conn: Checking Id: 0
rlm_ldap: ldap_get_conn: Got Id: 0
rlm_ldap: performing search in dc=hampshire, dc=edu, with filter (uid=dude) 
rlm_ldap: object not found or got ambiguous search result
rlm_ldap::ldap_groupcmp: search failed
rlm_ldap: ldap_release_conn: Release Id: 0
   users: Matched entry DEFAULT at line 219
++[files] returns ok
rlm_ldap: - authorize
rlm_ldap: performing user authorization for dude
       expand: (uid=%{Stripped-User-Name}) -> (uid=dude)
       expand: dc=hampshire, dc=edu -> dc=hampshire, dc=edu
rlm_ldap: ldap_get_conn: Checking Id: 0
rlm_ldap: ldap_get_conn: Got Id: 0
rlm_ldap: performing search in dc=hampshire, dc=edu, with filter (uid=dude) 
rlm_ldap: object not found or got ambiguous search result
rlm_ldap: search failed
rlm_ldap: ldap_release_conn: Release Id: 0
++[ldap] returns notfound
 Found Post-Auth-Type Reject
+- entering group REJECT
       expand: %{User-Name} -> dude@testdomain.edu
attr_filter: Matched entry DEFAULT at line 11
++[attr_filter.access_reject] returns updated
Delaying reject of request 0 for 1 seconds
Going to the next request
Waking up in 0.9 seconds.
Sending delayed reject for request 0
Sending Access-Reject of id 118 to 127.0.0.1 port 34022
Reply-Message = "Only current faculty, staff or students are allowed to log in." 
Waking up in 4.9 seconds.
Cleaning up request 0 ID 118 with timestamp +2
Ready to process requests.



Alan DeKok wrote:

Wm. Josiah Erikson wrote:

       #  Setting "Auth-Type = LDAP" is ALMOST ALWAYS WRONG.  We
       #  really can't emphasize this enough.
Uh. OK. That's exactly what I'm doing, and it's working :) 

  Then it works.  It's fine.

  That message is for the majority of people who force LDAP to be used
for authentication, and the wonder why EAP doesn't work.

  Remember: LDAP is a database.  It's not an authentication server.


However, is there a better way to do this that I'm not understanding?
Why shouldn't I set Auth-Type := LDAP ?


  You probably don't need to set it.  If you simply deleted that from
the "users" file, your configuration would probably still work.

  Alan DeKok.
-
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--
Wm. Josiah Erikson
Computing Support
School of Cognitive Science
Hampshire College
Amherst, MA 01002
(413) 559-6091
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