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NetMeeting LDAP protocol violations

B. NetMeeting LDAP protocol violations

As mentioned, NetMeeting violates the LDAP protocol in several ways. For the record, NetMeeting:

  • Doesn't structure Distinguished Names (DNs) properly

    NetMeeting puts the most significant elements in the DN first, instead of last, using:

    		C=US, O=Microsoft, CN=xxx@abc.com, OBJECTCLASS=rtperson
                

    instead of the proper formating, which is:

                  CN=xxx@abc.com, O=Microsoft, C=US
                
  • Doesn't include the required "objectclass" attribute

    Instead, it tacks an "OBJECTCLASS" element to the end of the DN, as shown above.

  • Doesn't insert parents into the LDAP server

    This is a clear violation of the LDAP standard, which requires parents to exist before children can be created. I.e, to insert this DN:

                  CN=xxx@abc.com, O=Microsoft, C=US
                

    this DN must already exist:

    		O=Microsoft, C=US
                

    as must this one:

    	      C=US
                
  • Doesn't understand attribute aliases, and is therefore unable to recognize that "sn" and "surname" refer to the same attribute.

  • Requires that attributes in a search request be returned in exactly the same order they were requested, a requirement not guaranteed by the OpenLDAP server.

  • Specifies "base" scope in search requests, when it really should use "sub", since it wants a list of entries, not just one

  • Uses the "%" character as wildcard in search requests, instead of the "*" character specified by the standard.

  • Uses a non-standard means of refreshing dynamic entries.

    The Microsoft server maintains an "sttl" attribute, which is a time to live for the entry in minutes. A search request for attribute "sttl" resets the timer. If the timer goes to zero, the entry is supposed to disappear from the database. NetMeeting 2 supplies an "sttl" attribute, but NetMeeting 3 doesn't actually create the "sttl" attribute at all. Also, the client doesn't bother to give us the whole DN it wants updated, only supplying the "cn" component.

 

 


 
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