Connections established using SASL die after search

[Mark R. <mr...@ok...>]

Hello, all. I've been trying to figure out the cause of a strange bug
and have traced it down to a small example. It seems that searching with
wildcards or using the ! operator cause the ldap connection to die, but
only when using gssapi (possibly other sasl mechanisms, that's the only
one I've tried).

Here is the code that causes the problem, you should be able to cut n'
paste into an interactive interpreter.

Thanks for any suggestions.

Mark Roach

#----------------------------

import ldap
import ldap.sasl

URI = 'ldap://cujo.okmaybe.com'
BASEDN = 'dc=okmaybe,dc=com'
BINDDN = 'cn=admin,dc=okmaybe,dc=com'
PASS = 'mypassword'

def printTree(conn, dn, out, indent=0, run_extra_search=False):
    "recursively prints ou objects to a list"
    # This is the extra bit of searching that kills the ldap connection
    if (run_extra_search):
        resid = conn.search(dn, ldap.SCOPE_ONELEVEL, \
                '(objectClass=*)')
        rescode, res = conn.result(resid, timeout=10)
    # Search for organizationalUnits recursively
    resid = conn.search(dn, ldap.SCOPE_ONELEVEL, \
            '(objectClass=organizationalUnit)', ['ou'])
    rescode, res = conn.result(resid, timeout=10)
    out.append( "    " * indent + dn)
    for c in res: 
        if c[1].has_key('ou'):
            printTree(conn, c[0], out, indent + 1, run_extra_search)

### Try a connection with simple bind (This works fine)
l = ldap.initialize(URI)

l.bind_s(BINDDN, PASS)

for i in xrange(50):
    out = []
    printTree(l, BASEDN, out)

for i in xrange(50):
    out = []
    printTree(l, BASEDN, out, run_extra_search = True)


### Now try a gssapi connection
g = ldap.sasl.gssapi()
l = ldap.initialize(URI)
l.sasl_interactive_bind_s('', g)

# This one works
for i in xrange(50):
    out = []
    try:
        printTree(l, BASEDN, out)
    except:
        print "Died on iteration %d" % (i)
        print out
        break

# Maybe dies, maybe succeeds (mostly dies)
for i in xrange(50):
    out = []
    try:
        printTree(l, BASEDN, out, run_extra_search = True)
    except:
        print "Died on iteration %d" % (i)
        print out
        break