mirror of
https://github.com/SELinuxProject/setools
synced 2025-03-18 08:35:19 +00:00
Constraint/Validatetrans: Refactor to load attributes on construction.
This commit is contained in:
Chris PeBenito
parent
d0012dacaa
commit
ded09017d6
@ -39,6 +39,11 @@ cdef class BaseConstraint(PolicySymbol):
|
||||
sepol.constraint_node_t *handle
|
||||
readonly object ruletype
|
||||
readonly object tclass
|
||||
list _postfix_expression
|
||||
list _infix_expression
|
||||
readonly frozenset users
|
||||
readonly frozenset roles
|
||||
readonly frozenset types
|
||||
|
||||
def __str__(self):
|
||||
raise NotImplementedError
|
||||
@ -65,60 +70,63 @@ cdef class BaseConstraint(PolicySymbol):
|
||||
Return: list
|
||||
"""
|
||||
|
||||
_precedence = {
|
||||
"not": 4,
|
||||
"and": 2,
|
||||
"or": 1,
|
||||
"==": 3,
|
||||
"!=": 3,
|
||||
"dom": 3,
|
||||
"domby": 3,
|
||||
"incomp": 3}
|
||||
if self._infix_expression is None:
|
||||
_precedence = {
|
||||
"not": 4,
|
||||
"and": 2,
|
||||
"or": 1,
|
||||
"==": 3,
|
||||
"!=": 3,
|
||||
"dom": 3,
|
||||
"domby": 3,
|
||||
"incomp": 3}
|
||||
|
||||
_max_precedence = 4
|
||||
_max_precedence = 4
|
||||
|
||||
_operands = ["u1", "u2", "u3",
|
||||
"r1", "r2", "r3",
|
||||
"t1", "t2", "t3",
|
||||
"l1", "l2",
|
||||
"h1", "h2"]
|
||||
_operands = ["u1", "u2", "u3",
|
||||
"r1", "r2", "r3",
|
||||
"t1", "t2", "t3",
|
||||
"l1", "l2",
|
||||
"h1", "h2"]
|
||||
|
||||
# qpol representation is in postfix notation. This code
|
||||
# converts it to infix notation. Parentheses are added
|
||||
# to ensure correct expressions, though they may end up
|
||||
# being overused. Set previous operator at start to the
|
||||
# highest precedence (op) so if there is a single binary
|
||||
# operator, no parentheses are output
|
||||
stack = []
|
||||
prev_op_precedence = _max_precedence
|
||||
for op in self.postfix_expression():
|
||||
if isinstance(op, frozenset) or op in _operands:
|
||||
# operands
|
||||
stack.append(op)
|
||||
else:
|
||||
# operators
|
||||
if op == "not":
|
||||
# unary operator
|
||||
operator = op
|
||||
operand = stack.pop()
|
||||
op_precedence = _precedence[op]
|
||||
stack.append([operator, "(", operand, ")"])
|
||||
# sepol representation is in postfix notation. This code
|
||||
# converts it to infix notation. Parentheses are added
|
||||
# to ensure correct expressions, though they may end up
|
||||
# being overused. Set previous operator at start to the
|
||||
# highest precedence (op) so if there is a single binary
|
||||
# operator, no parentheses are output
|
||||
stack = []
|
||||
prev_op_precedence = _max_precedence
|
||||
for op in self.postfix_expression():
|
||||
if isinstance(op, frozenset) or op in _operands:
|
||||
# operands
|
||||
stack.append(op)
|
||||
else:
|
||||
# binary operators
|
||||
operand2 = stack.pop()
|
||||
operand1 = stack.pop()
|
||||
operator = op
|
||||
|
||||
# if previous operator is of higher precedence
|
||||
# no parentheses are needed.
|
||||
if _precedence[op] < prev_op_precedence:
|
||||
stack.append([operand1, operator, operand2])
|
||||
# operators
|
||||
if op == "not":
|
||||
# unary operator
|
||||
operator = op
|
||||
operand = stack.pop()
|
||||
op_precedence = _precedence[op]
|
||||
stack.append([operator, "(", operand, ")"])
|
||||
else:
|
||||
stack.append(["(", operand1, operator, operand2, ")"])
|
||||
# binary operators
|
||||
operand2 = stack.pop()
|
||||
operand1 = stack.pop()
|
||||
operator = op
|
||||
|
||||
prev_op_precedence = _precedence[op]
|
||||
# if previous operator is of higher precedence
|
||||
# no parentheses are needed.
|
||||
if _precedence[op] < prev_op_precedence:
|
||||
stack.append([operand1, operator, operand2])
|
||||
else:
|
||||
stack.append(["(", operand1, operator, operand2, ")"])
|
||||
|
||||
return self._flatten_expression(stack)
|
||||
prev_op_precedence = _precedence[op]
|
||||
|
||||
self._infix_expression = self._flatten_expression(stack)
|
||||
|
||||
return self._infix_expression
|
||||
|
||||
def postfix_expression(self):
|
||||
"""
|
||||
@ -126,41 +134,7 @@ cdef class BaseConstraint(PolicySymbol):
|
||||
|
||||
Return: list
|
||||
"""
|
||||
expression = []
|
||||
for expr_node in ConstraintExprIterator.factory(self.policy, self.handle.expr):
|
||||
expression.extend(expr_node())
|
||||
|
||||
return expression
|
||||
|
||||
@property
|
||||
def roles(self):
|
||||
"""The roles used in the expression."""
|
||||
roles = set()
|
||||
for expr_node in ConstraintExprIterator.factory(self.policy, self.handle.expr):
|
||||
if expr_node.roles:
|
||||
roles.update(expr_node.names)
|
||||
|
||||
return roles
|
||||
|
||||
@property
|
||||
def types(self):
|
||||
"""The types and type attributes used in the expression."""
|
||||
types = set()
|
||||
for expr_node in ConstraintExprIterator.factory(self.policy, self.handle.expr):
|
||||
if expr_node.types:
|
||||
types.update(expr_node.names)
|
||||
|
||||
return types
|
||||
|
||||
@property
|
||||
def users(self):
|
||||
"""The users used in the expression."""
|
||||
users = set()
|
||||
for expr_node in ConstraintExprIterator.factory(self.policy, self.handle.expr):
|
||||
if expr_node.users:
|
||||
users.update(expr_node.names)
|
||||
|
||||
return users
|
||||
return self._postfix_expression
|
||||
|
||||
#
|
||||
# Internal functions
|
||||
@ -198,20 +172,41 @@ cdef class Constraint(BaseConstraint):
|
||||
|
||||
"""A constraint rule (constrain/mlsconstrain)."""
|
||||
|
||||
cdef readonly frozenset perms
|
||||
|
||||
@staticmethod
|
||||
cdef factory(SELinuxPolicy policy, ObjClass tclass, sepol.constraint_node_t *symbol):
|
||||
"""Factory function for creating Constraint objects."""
|
||||
c = Constraint()
|
||||
cdef:
|
||||
Constraint c = Constraint.__new__(Constraint)
|
||||
list users = []
|
||||
list roles = []
|
||||
list types = []
|
||||
|
||||
c.policy = policy
|
||||
c.handle = symbol
|
||||
c.tclass = tclass
|
||||
c.perms = frozenset(PermissionVectorIterator.factory(policy, tclass, symbol.permissions))
|
||||
|
||||
c.ruletype = ConstraintRuletype.constrain
|
||||
c._postfix_expression = []
|
||||
for expr_node in ConstraintExprIterator.factory(policy, symbol.expr):
|
||||
if expr_node.mls:
|
||||
c.ruletype = ConstraintRuletype.mlsconstrain
|
||||
break
|
||||
else:
|
||||
c.ruletype = ConstraintRuletype.constrain
|
||||
|
||||
if expr_node.types:
|
||||
types.extend(expr_node.names)
|
||||
elif expr_node.roles:
|
||||
roles.extend(expr_node.names)
|
||||
elif expr_node.users:
|
||||
users.extend(expr_node.names)
|
||||
|
||||
c._postfix_expression.extend(expr_node())
|
||||
|
||||
c.users = frozenset(users)
|
||||
c.roles = frozenset(roles)
|
||||
c.types = frozenset(types)
|
||||
|
||||
|
||||
return c
|
||||
|
||||
@ -229,12 +224,6 @@ cdef class Constraint(BaseConstraint):
|
||||
|
||||
return rule_string
|
||||
|
||||
@property
|
||||
def perms(self):
|
||||
"""The constraint's permission set."""
|
||||
return set(p for p in PermissionVectorIterator.factory(self.policy, self.tclass,
|
||||
self.handle.permissions))
|
||||
|
||||
|
||||
cdef class Validatetrans(BaseConstraint):
|
||||
|
||||
@ -243,17 +232,34 @@ cdef class Validatetrans(BaseConstraint):
|
||||
@staticmethod
|
||||
cdef factory(SELinuxPolicy policy, ObjClass tclass, sepol.constraint_node_t *symbol):
|
||||
"""Factory function for creating Validatetrans objects."""
|
||||
v = Validatetrans()
|
||||
cdef:
|
||||
Validatetrans v = Validatetrans.__new__(Validatetrans)
|
||||
list users = []
|
||||
list roles = []
|
||||
list types = []
|
||||
|
||||
v.policy = policy
|
||||
v.handle = symbol
|
||||
v.tclass = tclass
|
||||
|
||||
v.ruletype = ConstraintRuletype.validatetrans
|
||||
v._postfix_expression = []
|
||||
for expr_node in ConstraintExprIterator.factory(policy, symbol.expr):
|
||||
if expr_node.mls:
|
||||
v.ruletype = ConstraintRuletype.mlsvalidatetrans
|
||||
break
|
||||
else:
|
||||
v.ruletype = ConstraintRuletype.validatetrans
|
||||
|
||||
if expr_node.types:
|
||||
types.extend(expr_node.names)
|
||||
elif expr_node.roles:
|
||||
roles.extend(expr_node.names)
|
||||
elif expr_node.users:
|
||||
users.extend(expr_node.names)
|
||||
|
||||
v._postfix_expression.extend(expr_node())
|
||||
|
||||
v.users = frozenset(users)
|
||||
v.roles = frozenset(roles)
|
||||
v.types = frozenset(types)
|
||||
|
||||
return v
|
||||
|
||||
|
||||
@ -94,9 +94,9 @@ cdef class Type(BaseType):
|
||||
return _type_cache[<uintptr_t>symbol]
|
||||
except KeyError:
|
||||
t = Type.__new__(Type)
|
||||
_type_cache[<uintptr_t>symbol] = t
|
||||
t.policy = policy
|
||||
t.handle = symbol
|
||||
_type_cache[<uintptr_t>symbol] = t
|
||||
t.value = symbol.s.value
|
||||
t.name = policy.type_value_to_name(symbol.s.value - 1)
|
||||
t.ispermissive = <bint>symbol.flags & sepol.TYPE_FLAGS_PERMISSIVE
|
||||
|
||||
Loading…
Reference in New Issue
Block a user