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constraints.py
# Copyright 2016, Tresys Technology, LLC # Copyright 2018, Chris PeBenito <pebenito@ieee.org> # # This file is part of SETools. # # SETools 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. # # SETools 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 SETools. If not, see # <http://www.gnu.org/licenses/>. # from collections import namedtuple from ..policyrep import ConstraintRuletype from .descriptors import DiffResultDescriptor from .difference import Difference, SymbolWrapper, Wrapper from .objclass import class_wrapper_factory from .types import type_wrapper_factory class ConstraintsDifference(Difference): """ Determine the difference in constraints between two policies. Since the compiler does not union constraints, there may be multiple constraints with the same ruletype, object class, and permission set, so constraints can only be added or removed, not modified. The constraint expressions are compared only on a basic level. Expressions that are logically equivalent but are structurally different, for example, by associativity, will be considered different. Type and role attributes are also not expanded, so if there are changes to attribute members, it will not be reflected as a difference. """ added_constrains = DiffResultDescriptor("diff_constrains") removed_constrains = DiffResultDescriptor("diff_constrains") added_mlsconstrains = DiffResultDescriptor("diff_mlsconstrains") removed_mlsconstrains = DiffResultDescriptor("diff_mlsconstrains") added_validatetrans = DiffResultDescriptor("diff_validatetrans") removed_validatetrans = DiffResultDescriptor("diff_validatetrans") added_mlsvalidatetrans = DiffResultDescriptor("diff_mlsvalidatetrans") removed_mlsvalidatetrans = DiffResultDescriptor("diff_mlsvalidatetrans") # Lists of rules for each policy _left_constrains = None _right_constrains = None _left_mlsconstrains = None _right_mlsconstrains = None _left_validatetrans = None _right_validatetrans = None _left_mlsvalidatetrans = None _right_mlsvalidatetrans = None def diff_constrains(self): """Generate the difference in constraint rules between the policies.""" self.log.info("Generating constraint differences from {0.left_policy} to {0.right_policy}". format(self)) if self._left_constrains is None or self._right_constrains is None: self._create_constrain_lists() self.added_constrains, self.removed_constrains, _ = self._set_diff( (ConstraintWrapper(c) for c in self._left_constrains), (ConstraintWrapper(c) for c in self._right_constrains)) def diff_mlsconstrains(self): """Generate the difference in MLS constraint rules between the policies.""" self.log.info( "Generating MLS constraint differences from {0.left_policy} to {0.right_policy}". format(self)) if self._left_mlsconstrains is None or self._right_mlsconstrains is None: self._create_constrain_lists() self.added_mlsconstrains, self.removed_mlsconstrains, _ = self._set_diff( (ConstraintWrapper(c) for c in self._left_mlsconstrains), (ConstraintWrapper(c) for c in self._right_mlsconstrains)) def diff_validatetrans(self): """Generate the difference in validatetrans rules between the policies.""" self.log.info( "Generating validatetrans differences from {0.left_policy} to {0.right_policy}". format(self)) if self._left_validatetrans is None or self._right_validatetrans is None: self._create_constrain_lists() self.added_validatetrans, self.removed_validatetrans, _ = self._set_diff( (ConstraintWrapper(c) for c in self._left_validatetrans), (ConstraintWrapper(c) for c in self._right_validatetrans)) def diff_mlsvalidatetrans(self): """Generate the difference in MLS validatetrans rules between the policies.""" self.log.info( "Generating mlsvalidatetrans differences from {0.left_policy} to {0.right_policy}". format(self)) if self._left_mlsvalidatetrans is None or self._right_mlsvalidatetrans is None: self._create_constrain_lists() self.added_mlsvalidatetrans, self.removed_mlsvalidatetrans, _ = self._set_diff( (ConstraintWrapper(c) for c in self._left_mlsvalidatetrans), (ConstraintWrapper(c) for c in self._right_mlsvalidatetrans)) # # Internal functions # def _create_constrain_lists(self): """Create rule lists for both policies.""" self._left_constrains = [] self._left_mlsconstrains = [] self._left_validatetrans = [] self._left_mlsvalidatetrans = [] for rule in self.left_policy.constraints(): if rule.ruletype == ConstraintRuletype.constrain: self._left_constrains.append(rule) elif rule.ruletype == ConstraintRuletype.mlsconstrain: self._left_mlsconstrains.append(rule) elif rule.ruletype == ConstraintRuletype.validatetrans: self._left_validatetrans.append(rule) elif rule.ruletype == ConstraintRuletype.mlsvalidatetrans: self._left_mlsvalidatetrans.append(rule) else: self.log.error("Unknown rule type: {0} (This is an SETools bug)". format(rule.ruletype)) self._right_constrains = [] self._right_mlsconstrains = [] self._right_validatetrans = [] self._right_mlsvalidatetrans = [] for rule in self.right_policy.constraints(): if rule.ruletype == ConstraintRuletype.constrain: self._right_constrains.append(rule) elif rule.ruletype == ConstraintRuletype.mlsconstrain: self._right_mlsconstrains.append(rule) elif rule.ruletype == ConstraintRuletype.validatetrans: self._right_validatetrans.append(rule) elif rule.ruletype == ConstraintRuletype.mlsvalidatetrans: self._right_mlsvalidatetrans.append(rule) else: self.log.error("Unknown rule type: {0} (This is an SETools bug)". format(rule.ruletype)) def _reset_diff(self): """Reset diff results on policy changes.""" self.log.debug("Resetting all constraints differences") self.added_constrains = None self.removed_constrains = None self.added_mlsconstrains = None self.removed_mlsconstrains = None self.added_validatetrans = None self.removed_validatetrans = None self.added_mlsvalidatetrans = None self.removed_mlsvalidatetrans = None # Sets of rules for each policy self._left_constrains = None self._left_mlsconstrains = None self._left_validatetrans = None self._left_mlsvalidatetrans = None self._right_constrains = None self._right_mlsconstrains = None self._right_validatetrans = None self._right_mlsvalidatetrans = None class ConstraintWrapper(Wrapper): """Wrap constraints for diff purposes.""" __slots__ = ("ruletype", "tclass", "perms", "expr") def __init__(self, rule): self.origin = rule self.ruletype = rule.ruletype self.tclass = class_wrapper_factory(rule.tclass) try: self.perms = rule.perms except AttributeError: # (mls)validatetrans self.perms = None self.key = hash(rule) self.expr = [] for op in rule.expression: if isinstance(op, frozenset): # lists of types/users/roles self.expr.append(frozenset(SymbolWrapper(item) for item in op)) else: # strings in the expression such as u1/r1/t1 or "==" self.expr.append(op) def __hash__(self): return self.key def __lt__(self, other): return self.key < other.key def __eq__(self, other): return self.ruletype == other.ruletype and \ self.tclass == other.tclass and \ self.perms == other.perms and \ self.expr == other.expr
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