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# Copyright (C) 2007 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2 or later
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
import re
import urllib
class ACI:
"""
Holds the basic data for an ACI entry, as stored in the cn=accounts
entry in LDAP. Has methods to parse an ACI string and export to an
ACI String.
"""
def __init__(self,acistr=None):
self.name = ''
self.source_group = ''
self.dest_group = ''
self.attrs = []
if acistr is not None:
self.parse_acistr(acistr)
def export_to_string(self):
"""Converts the ACI to a string suitable for an LDAP aci attribute."""
attrs_str = ' || '.join(self.attrs)
# dest_group and source_group are assumed to be pre-escaped.
# dn's aren't typed in, but searched for, and the search results
# will return escaped dns
acistr = ('(targetattr="%s")' +
'(targetfilter="(memberOf=%s)")' +
'(version 3.0;' +
'acl "%s";' +
'allow (write) ' +
'groupdn="ldap:///%s";)') % (attrs_str,
self.dest_group,
self.name,
urllib.quote(self.source_group, "/=, "))
return acistr
def _match(self, prefix, inputstr):
"""Returns inputstr with prefix removed, or else raises a
SyntaxError."""
if inputstr.startswith(prefix):
return inputstr[len(prefix):]
else:
raise SyntaxError, "'%s' not found at '%s'" % (prefix, inputstr)
def _match_str(self, inputstr):
"""Tries to extract a " delimited string from the front of inputstr.
Returns (string, inputstr) where:
- string is the extracted string (minus the enclosing " chars)
- inputstr is the parameter with the string removed.
Raises SyntaxError is a string is not found."""
if not inputstr.startswith('"'):
raise SyntaxError, "string not found at '%s'" % inputstr
found = False
start_index = 1
final_index = 1
while not found and (final_index < len(inputstr)):
if inputstr[final_index] == '\\':
final_index += 2
elif inputstr[final_index] == '"':
found = True
else:
final_index += 1
if not found:
raise SyntaxError, "string not found at '%s'" % inputstr
match = inputstr[start_index:final_index]
inputstr = inputstr[final_index + 1:]
return(match, inputstr)
def parse_acistr(self, acistr):
"""Parses the acistr. If the string isn't recognized, a SyntaxError
is raised."""
acistr = self._match('(targetattr=', acistr)
(attrstr, acistr) = self._match_str(acistr)
self.attrs = attrstr.split(' || ')
acistr = self._match(')(targetfilter=', acistr)
(target_dn_str, acistr) = self._match_str(acistr)
target_dn_str = self._match('(memberOf=', target_dn_str)
if target_dn_str.endswith(')'):
self.dest_group = target_dn_str[:-1]
else:
raise SyntaxError, "illegal dest_group at '%s'" % target_dn_str
acistr = self._match(')(version 3.0;acl ', acistr)
(name_str, acistr) = self._match_str(acistr)
self.name = name_str
acistr = self._match(';allow (write) groupdn=', acistr)
(src_dn_str, acistr) = self._match_str(acistr)
src_dn_str = self._match('ldap:///', src_dn_str)
self.source_group = urllib.unquote(src_dn_str)
acistr = self._match(';)', acistr)
if len(acistr) > 0:
raise SyntaxError, "unexpected aci suffix at '%s'" % acistr
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