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# common.py - functions that are used by different modules
#
# Copyright (C) 2010 Arthur de Jong
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
import cfg
import constants
import re
import ldap
import ldap.dn
_validname_re = re.compile(r'^[A-Za-z0-9._@$][A-Za-z0-9._@$ \\~-]{0,98}[A-Za-z0-9._@$~-]$')
def isvalidname(name):
"""Checks to see if the specified name seems to be a valid user or group
name.
This test is based on the definition from POSIX (IEEE Std 1003.1, 2004,
3.426 User Name, 3.189 Group Name and 3.276 Portable Filename Character Set):
http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_426
http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_189
http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_276
The standard defines user names valid if they contain characters from
the set [A-Za-z0-9._-] where the hyphen should not be used as first
character. As an extension this test allows some more characters."""
return bool(_validname_re.match(name))
def validate_name(name):
"""Checks to see if the specified name seems to be a valid user or group
name. See isvalidname()."""
if not _validname_re.match(name):
raise ValueError('%r: invalid user name' % name)
class Request(object):
"""
Request handler class. Subclasses are expected to handle actual requests
and should implement the following members:
action: the NSLCD_ACTION_* action that should trigger this handler
read_parameters: a function that reads the request parameters of the
request stream
filter: LDAP search filter
mk_filter (optional): function that returns the LDAP search filter
write: function that writes a single LDAP entry to the result stream
"""
bases = cfg.bases
scope = cfg.scope
def __init__(self, fp, conn, calleruid):
self.fp = fp
self.conn = conn
self.calleruid = calleruid
# have default empty values for these
self.name = None
self.uid = None
self.gid = None
self.address = None
def read_parameters(self):
"""This method should read the parameters from ths stream and
store them in self."""
pass
def mk_filter(self):
"""Return the active search filter (based on the read parameters)."""
return self.filter
def handle_request(self):
"""This method handles the request based on the parameters read
with read_parameters()."""
# get search results
for base in self.bases:
# do the LDAP search
try:
res = self.conn.search_s(base, self.scope, self.mk_filter(), self.attributes)
for entry in res:
if entry[0]:
self.write(entry)
except ldap.NO_SUCH_OBJECT:
# FIXME: log message
pass
# write the final result code
self.fp.write_int32(constants.NSLCD_RESULT_END)
def __call__(self):
self.read_parameters()
# TODO: log call with parameters
self.fp.write_int32(constants.NSLCD_VERSION)
self.fp.write_int32(self.action)
self.handle_request()
def get_handlers(module):
"""Return a dictionary mapping actions to Request classes."""
import inspect
res = {}
if isinstance(module, basestring):
module = __import__(module, globals())
for name, cls in inspect.getmembers(module, inspect.isclass):
if issubclass(cls, Request) and hasattr(cls, 'action'):
res[cls.action] = cls
return res
def get_rdn_value(entry, attribute):
dn, attributes = entry
return dict((x, y) for x, y, z in ldap.dn.str2dn(dn)[0])[attribute]
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