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R3600/modules/webaccess/lib/access_control_engine.py
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access_control_engine.py
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## $Id$
## CDSware Access Control Engine in mod_python.
## This file is part of the CERN Document Server Software (CDSware).
## Copyright (C) 2002, 2003, 2004, 2005 CERN.
##
## The CDSware 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; either version 2 of the
## License, or (at your option) any later version.
##
## The CDSware 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 CDSware; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""CDSware Access Control Engine in mod_python."""
<protect> ## okay, rest of the Python code goes below #######
__version__ = "$Id$"
## import interesting modules:
from config import *
from dbquery import run_sql
from MySQLdb import ProgrammingError
from access_control_config import SUPERADMINROLE, cfg_webaccess_warning_msgs, cfg_webaccess_msgs, CFG_ACCESS_CONTROL_LEVEL_GUESTS, CFG_ACCESS_CONTROL_LEVEL_ACCOUNTS#, CFG_EXTERNAL_ACCESS_CONTROL
called_from = 1 #1=web,0=cli
try:
import _apache
except ImportError, e:
called_from = 0
## access controle engine function
def acc_authorize_action(id_user, name_action, verbose=0, **arguments):
"""Check if user is allowed to perform action
with given list of arguments.
Return (0, message) if authentication succeeds, (error code, error message) if it fails.
The arguments are as follows:
id_user - id of the user in the database
name_action - the name of the action
arguments - dictionary with keyword=value pairs created automatically
by python on the extra arguments. these depend on the
given action.
"""
#TASK -1: Checking external source if user is authorized:
#if CFG_:
# em_pw = run_sql("SELECT email, password FROM user WHERE id=%s", (id_user,))
# if em_pw:
# if not CFG_EXTERNAL_ACCESS_CONTROL.loginUser(em_pw[0][0], em_pw[0][1]):
# return (10, "%s %s" % (cfg_webaccess_warning_msgs[10], (called_from and cfg_webaccess_msgs[1] or "")))
# TASK 0: find id and allowedkeywords of action
if verbose: print 'task 0 - get action info'
query1 = """select a.id, a.allowedkeywords, a.optional
from accACTION a
where a.name = '%s'""" % (name_action)
try: id_action, aallowedkeywords, optional = run_sql(query1)[0]
except (ProgrammingError, IndexError): return (3, "%s %s" % (cfg_webaccess_warning_msgs[3] % name_action, (called_from and cfg_webaccess_msgs[1] or "")))
defkeys = aallowedkeywords.split(',')
for key in arguments.keys():
if key not in defkeys: return (8, "%s %s" % (cfg_webaccess_warning_msgs[8], (called_from and "%s %s" % (cfg_webaccess_msgs[0] % name_action[3:], cfg_webaccess_msgs[1]) or ""))) #incorrect arguments?
# -------------------------------------------
# TASK 1: check if user is a superadmin
# we know the action exists. no connection with role is necessary
# passed arguments must have allowed keywords
# no check to see if the argument exists
if verbose: print 'task 1 - is user %s' % (SUPERADMINROLE, )
if run_sql("""SELECT *
FROM accROLE r LEFT JOIN user_accROLE ur
ON r.id = ur.id_accROLE
WHERE r.name = '%s' AND
ur.id_user = '%s' """ % (SUPERADMINROLE, id_user)):
return (0, cfg_webaccess_warning_msgs[0])
# ------------------------------------------
# TASK 2: check if user exists and find all the user's roles and create or-string
if verbose: print 'task 2 - find user and userroles'
try:
query2 = """SELECT email, note from user where id=%s""" % id_user
res2 = run_sql(query2)
if not res2:
raise Exception
if CFG_ACCESS_CONTROL_LEVEL_ACCOUNTS >= 1 and res2[0][1] not in [1, "1"]:
if res[0][1]:
return (9, "%s %s" % (cfg_webaccess_warning_msgs[9] % res[0][1], (called_from and "%s %s" % (cfg_webaccess_msgs[0] % name_action[3:], cfg_webaccess_msgs[1]) or "")))
else:
raise Exception
query2 = """SELECT ur.id_accROLE FROM user_accROLE ur WHERE ur.id_user=%s ORDER BY ur.id_accROLE """ % id_user
res2 = run_sql(query2)
except Exception: return (6, "%s %s" % (cfg_webaccess_warning_msgs[6], (called_from and "%s %s" % (cfg_webaccess_msgs[0] % name_action[3:], cfg_webaccess_msgs[1]) or "")))
if not res2: return (2, "%s %s" % (cfg_webaccess_warning_msgs[2], (called_from and "%s %s" % (cfg_webaccess_msgs[0] % name_action[3:], cfg_webaccess_msgs[1]) or ""))) #user has no roles
# -------------------------------------------
# create role string (add default value? roles='(raa.id_accROLE='def' or ')
str_roles = ''
for (role, ) in res2:
if str_roles: str_roles += ','
str_roles += '%s' % (role, )
# TASK 3: authorizations with no arguments given
if verbose: print 'task 3 - checks with no arguments'
if not arguments:
# 3.1
if optional == 'no':
if verbose: print ' - action with zero arguments'
connection = run_sql("""SELECT * FROM accROLE_accACTION_accARGUMENT
WHERE id_accROLE IN (%s) AND
id_accACTION = %s AND
argumentlistid = 0 AND
id_accARGUMENT = 0 """ % (str_roles, id_action))
if connection and 1:
return (0, cfg_webaccess_warning_msgs[0])
else:
return (1, "%s %s" % (cfg_webaccess_warning_msgs[1], (called_from and "%s %s" % (cfg_webaccess_msgs[0] % name_action[3:], cfg_webaccess_msgs[1]) or "")))
# 3.2
if optional == 'yes':
if verbose: print ' - action with optional arguments'
connection = run_sql("""SELECT * FROM accROLE_accACTION_accARGUMENT
WHERE id_accROLE IN (%s) AND
id_accACTION = %s AND
id_accARGUMENT = -1 AND
argumentlistid = -1 """ % (str_roles, id_action))
if connection and 1:
return (0, cfg_webaccess_warning_msgs[0])
else:
return (1, "%s %s" % (cfg_webaccess_warning_msgs[1], (called_from and "%s %s" % (cfg_webaccess_msgs[0] % name_action[3:], cfg_webaccess_msgs[1]) or "")))
# none of the zeroargs tests succeded
if verbose: print ' - not authorization without arguments'
return (5, "%s %s" % (cfg_webaccess_warning_msgs[5], (called_from and "%s" % (cfg_webaccess_msgs[1] or ""))))
# TASK 4: create list of keyword and values that satisfy part of the authentication and create or-string
if verbose: print 'task 4 - create keyword=value pairs'
# create dictionary with default values and replace entries from input arguments
defdict = {}
for key in defkeys:
try: defdict[key] = arguments[key]
except KeyError: return (5, "%s %s" % (cfg_webaccess_warning_msgs[5], (called_from and "%s" % (cfg_webaccess_msgs[1] or "")))) # all keywords must be present
# except KeyError: defdict[key] = 'x' # default value, this is not in use...
# create or-string from arguments
str_args = ''
for key in defkeys:
if str_args: str_args += ' OR '
str_args += """(arg.keyword = '%s' AND arg.value = '%s')""" % (key, defdict[key])
# TASK 5: find all the table entries that partially authorize the action in question
if verbose: print 'task 5 - find table entries that are part of the result'
query4 = """SELECT DISTINCT raa.id_accROLE, raa.id_accACTION, raa.argumentlistid,
raa.id_accARGUMENT, arg.keyword, arg.value
FROM accROLE_accACTION_accARGUMENT raa, accARGUMENT arg
WHERE raa.id_accACTION = %s AND
raa.id_accROLE IN (%s) AND
(%s) AND
raa.id_accARGUMENT = arg.id """ % (id_action, str_roles, str_args)
try: res4 = run_sql(query4)
except ProgrammingError: return (3, "%s %s" % (cfg_webaccess_warning_msgs[3], (called_from and "%s" % (cfg_webaccess_msgs[1] or ""))))
if not res4: return (1, "%s %s" % (cfg_webaccess_warning_msgs[1], (called_from and "%s %s" % (cfg_webaccess_msgs[0] % name_action[3:], cfg_webaccess_msgs[1]) or ""))) # no entries at all
res5 = []
for res in res4:
res5.append(res)
res5.sort()
# USER AUTHENTICATED TO PERFORM ACTION WITH ONE ARGUMENT
if len(defdict) == 1: return (0, cfg_webaccess_warning_msgs[0])
# CHECK WITH MORE THAN 1 ARGUMENT
# TASK 6: run through the result and try to satisfy authentication
if verbose: print 'task 6 - combine results and try to satisfy'
cur_role = cur_action = cur_arglistid = 0
booldict = {}
for key in defkeys: booldict[key] = 0
# run through the results
for (role, action, arglistid, arg, keyword, val) in res5 + [(-1, -1, -1, -1, -1, -1)]:
# not the same role or argumentlist (authorization group), i.e. check if thing are satisfied
# if cur_arglistid != arglistid or cur_role != role or cur_action != action:
if (cur_arglistid, cur_role, cur_action) != (arglistid, role, action):
if verbose: print ' : checking new combination',
# test if all keywords are satisfied
for value in booldict.values():
if not value: break
else:
if verbose: print '-> found satisfying combination'
return (0, cfg_webaccess_warning_msgs[0]) # USER AUTHENTICATED TO PERFORM ACTION
if verbose: print '-> not this one'
# assign the values for the current tuple from the query
cur_arglistid, cur_role, cur_action = arglistid, role, action
for key in booldict.keys():
booldict[key] = 0
# set keyword qualified for the action, (whatever result of the test)
booldict[keyword] = 1
if verbose: print 'finished'
# authentication failed
return (4, "%s %s" % (cfg_webaccess_warning_msgs[4], (called_from and "%s %s" % (cfg_webaccess_msgs[0] % name_action[3:], cfg_webaccess_msgs[1]) or "")))
</protect>
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