LDAP group membership verification crashes with UnicodeDecodeError when username contains non-ASCII chars

[Morten Brekkevold]

If a user's login name contains non-ASCII characters, and the "required_group" option is set in the `ldap` section of `webfront.conf`, that user will experience a crash at login time.

The group verification step raises a UnicodeDecodeError, traceback looking like this:

Traceback (most recent call last):

  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 111, in get_response
    response = callback(request, *callback_args, **callback_kwargs)

  File "/usr/lib/python2.7/dist-packages/django/views/decorators/debug.py", line 69, in sensitive_post_parameters_wrapper
    return view(request, *args, **kwargs)

  File "/usr/lib/pymodules/python2.7/nav/web/webfront/views.py", line 92, in login
    return do_login(request)

  File "/usr/lib/python2.7/dist-packages/django/views/decorators/debug.py", line 34, in sensitive_variables_wrapper
    return func(*args, **kwargs)

  File "/usr/lib/pymodules/python2.7/nav/web/webfront/views.py", line 127, in do_login
    account = auth.authenticate(username, password)

  File "/usr/lib/pymodules/python2.7/nav/web/auth.py", line 79, in authenticate
    user = ldapauth.authenticate(username, password)

  File "/usr/lib/pymodules/python2.7/nav/web/ldapauth.py", line 151, in authenticate
    if user.is_group_member(group_dn):

  File "/usr/lib/pymodules/python2.7/nav/web/ldapauth.py", line 280, in is_group_member
    result = self.ldap.search_s(group_dn, ldap.SCOPE_BASE, filterstr)

  File "/usr/lib/python2.7/dist-packages/ldap/ldapobject.py", line 552, in search_s
    return self.search_ext_s(base,scope,filterstr,attrlist,attrsonly,None,None,timeout=self.timeout)

  File "/usr/lib/python2.7/dist-packages/ldap/ldapobject.py", line 545, in search_ext_s
    msgid = self.search_ext(base,scope,filterstr,attrlist,attrsonly,serverctrls,clientctrls,timeout,sizelimit)

  File "/usr/lib/python2.7/dist-packages/ldap/ldapobject.py", line 541, in search_ext
    timeout,sizelimit,

  File "/usr/lib/python2.7/dist-packages/ldap/ldapobject.py", line 99, in _ldap_call
    result = func(*args,**kwargs)

UnicodeEncodeError: 'ascii' codec can't encode character u'\xfc' in position 26: ordinal not in range(128)

[Morten Brekkevold (mbrekkevold)]

fix here: https://nav.uninett.no/hg/stable/rev/08eaf8c0338c