[kmail2] [Bug 323272] New: Querying a Microsoft Exchange's Active Directory via LDAP is extremely slow

[Thiago Macieira]

https://bugs.kde.org/show_bug.cgi?id=323272

            Bug ID: 323272
           Summary: Querying a Microsoft Exchange's Active Directory via
                    LDAP is extremely slow
    Classification: Unclassified
           Product: kmail2
           Version: Git (master)
          Platform: Compiled Sources
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: composer
          Assignee: kdepim-bugs at kde.org
          Reporter: thiago at kde.org

Whenever an LDAP query is sent to a Microsoft Exchange's Active Directory via
LDAP, the results are extremely slow to come. This is definitely an Exchange
bug -- it appears to timeout in searching and then replies after 120 seconds.
However, there's a specific field of the LDAP query that triggers it and it can
be worked around.

In (kdepim) libkdepim/ldap/ldapclientsearch.cpp, we have:
  const QString filter = QString(
"&(|(objectclass=person)(objectclass=groupOfNames)(mail=*))"
                                 
"(|(cn=%1*)(mail=%2*)(mail=*@%3*)(givenName=%4*)(sn=%5*))" )
                                .arg( d->mSearchText ).arg( d->mSearchText )
                                .arg( d->mSearchText ).arg( d->mSearchText
).arg( d->mSearchText );

The field that causes the slowdown is the (mail=*@%3*) part. In fact, it
appears that Exchange is slow for any query that starts with * in the field. If
that part of the query is removed, the server replies in reasonable time.

Reproducible: Always

Steps to Reproduce:
1. Set up LDAP to an Exchange AD server
2. Open a KMail Composer window
3. Start typing someone's name, surname or email address
Actual Results:  
No search results are shown for 2 minutes. That's because no network traffic
occurs for those 2 minutes: the server does not reply.

Expected Results:  
Search results come quickly.

PS: it's not necessary to have 4 .arg() calls with the same value. Replacing
all of the fields with %1 and using one .arg() call is enough.

-- 
You are receiving this mail because:
You are the assignee for the bug.