Info
RFC4511 allows LDAP searches to return empty attributes which have no values:
4.1.7. Attribute and PartialAttribute
Attributes and partial attributes consist of an attribute description
and attribute values. A PartialAttribute allows zero values, while
Attribute requires at least one value.
PartialAttribute ::= SEQUENCE {
type
AttributeDescription,
vals
SET OF value AttributeValue }
4.5.2. Search Result
The results of the Search operation are returned as zero or more
SearchResultEntry and/or SearchResultReference messages, followed by
a single SearchResultDone message.
SearchResultEntry ::= [APPLICATION 4] SEQUENCE {
objectName
LDAPDN,
attributes
PartialAttributeList }
PartialAttributeList ::= SEQUENCE OF
partialAttribute PartialAttribute
SearchResultReference ::= [APPLICATION 19] SEQUENCE
SIZE (1..MAX) OF uri URI
SearchResultDone ::= [APPLICATION 5] LDAPResult
Servers conforming to this specification do not need to return any values for a particular attribute.
libldap appears to return a NULL pointer when ldap_get_values_len is called for an attribute without values, instead of an array containing a NULL pointer. libldap more commonly returns a NULL pointer on error. However, this condition is not considered an error, so no result code is set on the LDAP session handle.
We should correctly handle this case.
Top User Comments
xgen-internal-githook commented on Fri, 17 Mar 2017 21:16:48 +0000:
Author:
{u'username': u'spencerjackson', u'name': u'Spencer Jackson', u'email': u'spencer.jackson@mongodb.com'}
Message: SERVER-28370: Avoid crash when parsing null valued LDAP attributes
(cherry picked from commit 37c0edb1a50590e7591412b1fcc308dd85348f24)
Branch: v3.4
https://github.com/10gen/mongo-enterprise-modules/commit/ddbfcdc097d658293caabdf2506222c43803c51d
xgen-internal-githook commented on Fri, 17 Mar 2017 19:37:38 +0000:
Author:
{u'username': u'spencerjackson', u'name': u'Spencer Jackson', u'email': u'spencer.jackson@mongodb.com'}
Message: SERVER-28370: Avoid crash when parsing null valued LDAP attributes
Branch: master
https://github.com/10gen/mongo-enterprise-modules/commit/37c0edb1a50590e7591412b1fcc308dd85348f24
