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# Copyright (C) 2015 Ipsilon project Contributors, for licensee see COPYING
from ipsilon.util.log import Log
import copy
import sys
class Policy(Log):
def __init__(self, mappings=None, allowed=None):
""" A Policy engine to filter attributes.
Mappings is a list of lists where the first value ia a list itself
and the second value is an attribute name or a list if the values
should go in a sub dictionary.
Note that mappings is a list and not a dictionary as this allows
to map the same original attribute to different resulting attributes
if wanted, by simply repeating the 'key list' with different values
or 'value lists'.
Example: [[['extras', 'shoes'], 'shoeNumber']]
A '*' can be used to allow any attribute.
The default mapping is [[['*'], '*']]
This copies all attributes without transformation.
Allowed is a list of allowed attributes.
Normally mapping should be called before filtering, this means
allowed attributes should name the mapped attributes.
Allowed attributes can be multi-element lists
Example: ['fullname', ['groups', 'domain users']]
Allowed is '*' by default.
"""
self.mappings = None
if mappings:
if not isinstance(mappings, list):
raise ValueError("Mappings should be a list not '%s'" %
type(mappings))
for el in mappings:
if not isinstance(el, list):
raise ValueError("Mappings must be lists, not '%s'" %
type(el))
if len(el) != 2:
raise ValueError("Mappings must contain 2 elements, "
"found %d" % len(el))
if isinstance(el[0], list) and len(el[0]) > 2:
raise ValueError("1st Mapping element can contain at "
"most 2 values, found %d" % len(el[0]))
if isinstance(el[1], list) and len(el[1]) > 2:
raise ValueError("2nd Mapping element can contain at "
"most 2 values, found %d" % len(el[1]))
self.mappings = mappings
else:
# default mapping, return all userdata and groups
# but ignore extras
self.mappings = [['*', '*']]
self.allowed = ['*']
if allowed:
if not isinstance(allowed, list):
raise ValueError("Allowed should be a list not '%s'" %
type(allowed))
self.allowed = allowed
def map_attributes(self, attributes):
if not isinstance(attributes, dict):
raise ValueError("Attributes must be dictionary, not %s" %
type(attributes))
not_mapped = copy.deepcopy(attributes)
mapped = dict()
for (key, value) in self.mappings:
if not isinstance(key, list):
key = [key]
if len(key) == 2:
prefix = key[0]
name = key[1]
else:
prefix = None
name = key[0]
if not isinstance(value, list):
value = [value]
if len(value) == 2:
mapprefix = value[0]
mapname = value[1]
else:
mapprefix = None
mapname = value[0]
if prefix:
if prefix in attributes:
attr = attributes[prefix]
else:
# '*' in a prefix matches nothing
continue
else:
attr = attributes
if name in attr:
if isinstance(attr, list):
if mapprefix:
if mapprefix not in mapped:
mapped[mapprefix] = list()
mapped[mapprefix].append(mapname)
if not_mapped:
if prefix in not_mapped:
while name in not_mapped[prefix]:
not_mapped[prefix].remove(name)
else:
if mapname not in mapped:
mapped[mapname] = list()
mapped[mapname].append(attr[name])
if not_mapped:
if prefix in not_mapped:
del not_mapped[prefix]
else:
mapin = copy.deepcopy(attr[name])
if mapname == '*':
mapname = name
if mapprefix:
if mapprefix not in mapped:
mapped[mapprefix] = dict()
mapped[mapprefix].update({mapname: mapin})
else:
mapped.update({mapname: mapin})
if not_mapped:
if prefix:
if prefix in not_mapped:
if name in not_mapped[prefix]:
del not_mapped[prefix][name]
elif name in not_mapped:
del not_mapped[name]
elif name == '*':
mapin = copy.deepcopy(attr)
# mapname is ignored if name == '*'
if mapprefix:
if mapprefix not in mapped:
mapped[mapprefix] = mapin
else:
mapped[mapprefix].update(mapin)
else:
mapped.update(mapin)
if not_mapped:
if prefix in not_mapped:
del not_mapped[prefix]
else:
not_mapped = None
else:
continue
return mapped, not_mapped
def filter_attributes(self, attributes, whitelist=True):
filtered = dict()
for name in self.allowed:
if isinstance(name, list):
key = name[0]
value = name[1]
if key in attributes:
attr = attributes[key]
if value == '*':
filtered[key] = attr
elif isinstance(attr, dict):
if key not in filtered:
filtered[key] = dict()
if value in attr:
filtered[key][value] = attr[value]
elif isinstance(attr, list):
if key not in filtered:
filtered[key] = list()
if value in attr:
filtered[key].append(value)
else:
continue
else:
if name in attributes:
filtered[name] = attributes[name]
elif name == '*':
filtered = attributes
if whitelist:
allowed = filtered
else:
# filtered contains the blacklisted
allowed = copy.deepcopy(attributes)
for lvl1 in filtered:
attr = filtered[lvl1]
if isinstance(attr, dict):
for lvl2 in attr:
del allowed[lvl1][lvl2]
elif isinstance(attr, list):
for lvl2 in attr:
allowed[lvl1].remove(lvl2)
else:
allowed[lvl1] = {}
if len(allowed[lvl1]) == 0:
del allowed[lvl1]
return allowed
# Unit tests
if __name__ == '__main__':
ret = 0
# Policy
t_attributes = {'onenameone': 'onevalueone',
'onenametwo': 'onevaluetwo',
'two': {'twonameone': 'twovalueone',
'twonametwo': 'twovaluetwo'},
'three': {'threenameone': 'threevalueone',
'threenametwo': 'threevaluetwo'},
'four': {'fournameone': 'fourvalueone',
'fournametwo': 'fourvaluetwo'},
'five': ['one', 'two', 'three'],
'six': ['one', 'two', 'three']}
# test defaults first
p = Policy()
print 'Default attribute mapping'
m, n = p.map_attributes(t_attributes)
if m == t_attributes and n is None:
print 'SUCCESS'
else:
ret += 1
print 'FAIL: Expected %s\nObtained %s' % (t_attributes, m)
print 'Default attribute filtering'
f = p.filter_attributes(t_attributes)
if f == t_attributes:
print 'SUCCESS'
else:
ret += 1
print 'Expected %s\nObtained %s' % (t_attributes, f)
# test custom mappings and filters
t_mappings = [[['onenameone'], 'onemappedone'],
[['onenametwo'], 'onemappedtwo'],
[['two', '*'], '*'],
[['three', 'threenameone'], 'threemappedone'],
[['three', 'threenameone'], 'threemappedbis'],
[['four', '*'], ['four', '*']],
[['five'], 'listfive'],
[['six', 'one'], ['six', 'mapone']]]
m_result = {'onemappedone': 'onevalueone',
'onemappedtwo': 'onevaluetwo',
'twonameone': 'twovalueone',
'twonametwo': 'twovaluetwo',
'threemappedone': 'threevalueone',
'threemappedbis': 'threevalueone',
'four': {'fournameone': 'fourvalueone',
'fournametwo': 'fourvaluetwo'},
'listfive': ['one', 'two', 'three'],
'six': ['mapone']}
n_result = {'three': {'threenametwo': 'threevaluetwo'},
'six': ['two', 'three']}
t_allowed = ['twonameone',
['four', 'fournametwo'],
['listfive', 'three'],
['six', '*']]
f_result = {'twonameone': 'twovalueone',
'four': {'fournametwo': 'fourvaluetwo'},
'listfive': ['three'],
'six': ['mapone']}
p = Policy(t_mappings, t_allowed)
print 'Custom attribute mapping'
m, n = p.map_attributes(t_attributes)
if m == m_result and n == n_result:
print 'SUCCESS'
else:
ret += 1
print 'Expected %s\nObtained %s' % (m_result, m)
print 'Custom attribute filtering'
f = p.filter_attributes(m)
if f == f_result:
print 'SUCCESS'
else:
ret += 1
print 'Expected %s\nObtained %s' % (f_result, f)
t2_allowed = ['onemappedone', 'twonametwo', 'threemappedone',
['listfive', 'two']]
f2_result = {'onemappedtwo': 'onevaluetwo',
'twonameone': 'twovalueone',
'threemappedbis': 'threevalueone',
'four': {'fournameone': 'fourvalueone',
'fournametwo': 'fourvaluetwo'},
'listfive': ['one', 'three'],
'six': ['mapone']}
p = Policy(t_mappings, t2_allowed)
print 'Custom attribute filtering 2'
m, _ = p.map_attributes(t_attributes)
f = p.filter_attributes(m, whitelist=False)
if f == f2_result:
print 'SUCCESS'
else:
ret += 1
print 'Expected %s\nObtained %s' % (f2_result, f)
sys.exit(ret)
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