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Diffstat (limited to 'lib/python2.7/site-packages/sepolgen/interfaces.py')
| -rw-r--r-- | lib/python2.7/site-packages/sepolgen/interfaces.py | 509 |
1 files changed, 0 insertions, 509 deletions
diff --git a/lib/python2.7/site-packages/sepolgen/interfaces.py b/lib/python2.7/site-packages/sepolgen/interfaces.py deleted file mode 100644 index 88a6dc3..0000000 --- a/lib/python2.7/site-packages/sepolgen/interfaces.py +++ /dev/null @@ -1,509 +0,0 @@ -# Authors: Karl MacMillan <kmacmillan@mentalrootkit.com> -# -# Copyright (C) 2006 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 only -# -# 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 -# - -""" -Classes for representing and manipulating interfaces. -""" - -import access -import refpolicy -import itertools -import objectmodel -import matching - -from sepolgeni18n import _ - -import copy - -class Param: - """ - Object representing a paramater for an interface. - """ - def __init__(self): - self.__name = "" - self.type = refpolicy.SRC_TYPE - self.obj_classes = refpolicy.IdSet() - self.required = True - - def set_name(self, name): - if not access.is_idparam(name): - raise ValueError("Name [%s] is not a param" % name) - self.__name = name - - def get_name(self): - return self.__name - - name = property(get_name, set_name) - - num = property(fget=lambda self: int(self.name[1:])) - - def __repr__(self): - return "<sepolgen.policygen.Param instance [%s, %s, %s]>" % \ - (self.name, refpolicy.field_to_str[self.type], " ".join(self.obj_classes)) - - -# Helper for extract perms -def __param_insert(name, type, av, params): - ret = 0 - if name in params: - p = params[name] - # The entries are identical - we're done - if type == p.type: - return - # Hanldle implicitly typed objects (like process) - if (type == refpolicy.SRC_TYPE or type == refpolicy.TGT_TYPE) and \ - (p.type == refpolicy.TGT_TYPE or p.type == refpolicy.SRC_TYPE): - #print name, refpolicy.field_to_str[p.type] - # If the object is not implicitly typed, tell the - # caller there is a likely conflict. - ret = 1 - if av: - avobjs = [av.obj_class] - else: - avobjs = [] - for obj in itertools.chain(p.obj_classes, avobjs): - if obj in objectmodel.implicitly_typed_objects: - ret = 0 - break - # "Promote" to a SRC_TYPE as this is the likely usage. - # We do this even if the above test fails on purpose - # as there is really no sane way to resolve the conflict - # here. The caller can take other actions if needed. - p.type = refpolicy.SRC_TYPE - else: - # There is some conflict - no way to resolve it really - # so we just leave the first entry and tell the caller - # there was a conflict. - ret = 1 - else: - p = Param() - p.name = name - p.type = type - params[p.name] = p - - if av: - p.obj_classes.add(av.obj_class) - return ret - - - -def av_extract_params(av, params): - """Extract the paramaters from an access vector. - - Extract the paramaters (in the form $N) from an access - vector, storing them as Param objects in a dictionary. - Some attempt is made at resolving conflicts with other - entries in the dict, but if an unresolvable conflict is - found it is reported to the caller. - - The goal here is to figure out how interface paramaters are - actually used in the interface - e.g., that $1 is a domain used as - a SRC_TYPE. In general an interface will look like this: - - interface(`foo', ` - allow $1 foo : file read; - ') - - This is simple to figure out - $1 is a SRC_TYPE. A few interfaces - are more complex, for example: - - interface(`foo_trans',` - domain_auto_trans($1,fingerd_exec_t,fingerd_t) - - allow $1 fingerd_t:fd use; - allow fingerd_t $1:fd use; - allow fingerd_t $1:fifo_file rw_file_perms; - allow fingerd_t $1:process sigchld; - ') - - Here the usage seems ambigious, but it is not. $1 is still domain - and therefore should be returned as a SRC_TYPE. - - Returns: - 0 - success - 1 - conflict found - """ - ret = 0 - found_src = False - if access.is_idparam(av.src_type): - if __param_insert(av.src_type, refpolicy.SRC_TYPE, av, params) == 1: - ret = 1 - - if access.is_idparam(av.tgt_type): - if __param_insert(av.tgt_type, refpolicy.TGT_TYPE, av, params) == 1: - ret = 1 - - if access.is_idparam(av.obj_class): - if __param_insert(av.obj_class, refpolicy.OBJ_CLASS, av, params) == 1: - ret = 1 - - for perm in av.perms: - if access.is_idparam(perm): - if __param_insert(perm, PERM) == 1: - ret = 1 - - return ret - -def role_extract_params(role, params): - if access.is_idparam(role.role): - return __param_insert(role.role, refpolicy.ROLE, None, params) - -def type_rule_extract_params(rule, params): - def extract_from_set(set, type): - ret = 0 - for x in set: - if access.is_idparam(x): - if __param_insert(x, type, None, params): - ret = 1 - return ret - - ret = 0 - if extract_from_set(rule.src_types, refpolicy.SRC_TYPE): - ret = 1 - - if extract_from_set(rule.tgt_types, refpolicy.TGT_TYPE): - ret = 1 - - if extract_from_set(rule.obj_classes, refpolicy.OBJ_CLASS): - ret = 1 - - if access.is_idparam(rule.dest_type): - if __param_insert(rule.dest_type, refpolicy.DEST_TYPE, None, params): - ret = 1 - - return ret - -def ifcall_extract_params(ifcall, params): - ret = 0 - for arg in ifcall.args: - if access.is_idparam(arg): - # Assume interface arguments are source types. Fairly safe - # assumption for most interfaces - if __param_insert(arg, refpolicy.SRC_TYPE, None, params): - ret = 1 - - return ret - -class AttributeVector: - def __init__(self): - self.name = "" - self.access = access.AccessVectorSet() - - def add_av(self, av): - self.access.add_av(av) - -class AttributeSet: - def __init__(self): - self.attributes = { } - - def add_attr(self, attr): - self.attributes[attr.name] = attr - - def from_file(self, fd): - def parse_attr(line): - fields = line[1:-1].split() - if len(fields) != 2 or fields[0] != "Attribute": - raise SyntaxError("Syntax error Attribute statement %s" % line) - a = AttributeVector() - a.name = fields[1] - - return a - - a = None - for line in fd: - line = line[:-1] - if line[0] == "[": - if a: - self.add_attr(a) - a = parse_attr(line) - elif a: - l = line.split(",") - av = access.AccessVector(l) - a.add_av(av) - if a: - self.add_attr(a) - -class InterfaceVector: - def __init__(self, interface=None, attributes={}): - # Enabled is a loose concept currently - we are essentially - # not enabling interfaces that we can't handle currently. - # See InterfaceVector.add_ifv for more information. - self.enabled = True - self.name = "" - # The access that is enabled by this interface - eventually - # this will include indirect access from typeattribute - # statements. - self.access = access.AccessVectorSet() - # Paramaters are stored in a dictionary (key: param name - # value: Param object). - self.params = { } - if interface: - self.from_interface(interface, attributes) - self.expanded = False - - def from_interface(self, interface, attributes={}): - self.name = interface.name - - # Add allow rules - for avrule in interface.avrules(): - if avrule.rule_type != refpolicy.AVRule.ALLOW: - continue - # Handle some policy bugs - if "dontaudit" in interface.name: - #print "allow rule in interface: %s" % interface - continue - avs = access.avrule_to_access_vectors(avrule) - for av in avs: - self.add_av(av) - - # Add typeattribute access - if attributes: - for typeattribute in interface.typeattributes(): - for attr in typeattribute.attributes: - if not attributes.attributes.has_key(attr): - # print "missing attribute " + attr - continue - attr_vec = attributes.attributes[attr] - for a in attr_vec.access: - av = copy.copy(a) - if av.src_type == attr_vec.name: - av.src_type = typeattribute.type - if av.tgt_type == attr_vec.name: - av.tgt_type = typeattribute.type - self.add_av(av) - - - # Extract paramaters from roles - for role in interface.roles(): - if role_extract_params(role, self.params): - pass - #print "found conflicting role param %s for interface %s" % \ - # (role.name, interface.name) - # Extract paramaters from type rules - for rule in interface.typerules(): - if type_rule_extract_params(rule, self.params): - pass - #print "found conflicting params in rule %s in interface %s" % \ - # (str(rule), interface.name) - - for ifcall in interface.interface_calls(): - if ifcall_extract_params(ifcall, self.params): - pass - #print "found conflicting params in ifcall %s in interface %s" % \ - # (str(ifcall), interface.name) - - - def add_av(self, av): - if av_extract_params(av, self.params) == 1: - pass - #print "found conflicting perms [%s]" % str(av) - self.access.add_av(av) - - def to_string(self): - s = [] - s.append("[InterfaceVector %s]" % self.name) - for av in self.access: - s.append(str(av)) - return "\n".join(s) - - def __str__(self): - return self.__repr__() - - def __repr__(self): - return "<InterfaceVector %s:%s>" % (self.name, self.enabled) - - -class InterfaceSet: - def __init__(self, output=None): - self.interfaces = { } - self.tgt_type_map = { } - self.tgt_type_all = [] - self.output = output - - def o(self, str): - if self.output: - self.output.write(str + "\n") - - def to_file(self, fd): - for iv in self.interfaces.values(): - fd.write("[InterfaceVector %s " % iv.name) - for param in iv.params.values(): - fd.write("%s:%s " % (param.name, refpolicy.field_to_str[param.type])) - fd.write("]\n") - avl = iv.access.to_list() - for av in avl: - fd.write(",".join(av)) - fd.write("\n") - - def from_file(self, fd): - def parse_ifv(line): - fields = line[1:-1].split() - if len(fields) < 2 or fields[0] != "InterfaceVector": - raise SyntaxError("Syntax error InterfaceVector statement %s" % line) - ifv = InterfaceVector() - ifv.name = fields[1] - if len(fields) == 2: - return - for field in fields[2:]: - p = field.split(":") - if len(p) != 2: - raise SyntaxError("Invalid param in InterfaceVector statement %s" % line) - param = Param() - param.name = p[0] - param.type = refpolicy.str_to_field[p[1]] - ifv.params[param.name] = param - return ifv - - ifv = None - for line in fd: - line = line[:-1] - if line[0] == "[": - if ifv: - self.add_ifv(ifv) - ifv = parse_ifv(line) - elif ifv: - l = line.split(",") - av = access.AccessVector(l) - ifv.add_av(av) - if ifv: - self.add_ifv(ifv) - - self.index() - - def add_ifv(self, ifv): - self.interfaces[ifv.name] = ifv - - def index(self): - for ifv in self.interfaces.values(): - tgt_types = set() - for av in ifv.access: - if access.is_idparam(av.tgt_type): - self.tgt_type_all.append(ifv) - tgt_types = set() - break - tgt_types.add(av.tgt_type) - - for type in tgt_types: - l = self.tgt_type_map.setdefault(type, []) - l.append(ifv) - - def add(self, interface, attributes={}): - ifv = InterfaceVector(interface, attributes) - self.add_ifv(ifv) - - def add_headers(self, headers, output=None, attributes={}): - for i in itertools.chain(headers.interfaces(), headers.templates()): - self.add(i, attributes) - - self.expand_ifcalls(headers) - self.index() - - def map_param(self, id, ifcall): - if access.is_idparam(id): - num = int(id[1:]) - if num > len(ifcall.args): - # Tell caller to drop this because it must have - # been generated from an optional param. - return None - else: - arg = ifcall.args[num - 1] - if isinstance(arg, list): - return arg - else: - return [arg] - else: - return [id] - - def map_add_av(self, ifv, av, ifcall): - src_types = self.map_param(av.src_type, ifcall) - if src_types is None: - return - - tgt_types = self.map_param(av.tgt_type, ifcall) - if tgt_types is None: - return - - obj_classes = self.map_param(av.obj_class, ifcall) - if obj_classes is None: - return - - new_perms = refpolicy.IdSet() - for perm in av.perms: - p = self.map_param(perm, ifcall) - if p is None: - continue - else: - new_perms.update(p) - if len(new_perms) == 0: - return - - for src_type in src_types: - for tgt_type in tgt_types: - for obj_class in obj_classes: - ifv.access.add(src_type, tgt_type, obj_class, new_perms) - - def do_expand_ifcalls(self, interface, if_by_name): - # Descend an interface call tree adding the access - # from each interface. This is a depth first walk - # of the tree. - - stack = [(interface, None)] - ifv = self.interfaces[interface.name] - ifv.expanded = True - - while len(stack) > 0: - cur, cur_ifcall = stack.pop(-1) - - cur_ifv = self.interfaces[cur.name] - if cur != interface: - - for av in cur_ifv.access: - self.map_add_av(ifv, av, cur_ifcall) - - # If we have already fully expanded this interface - # there is no reason to descend further. - if cur_ifv.expanded: - continue - - for ifcall in cur.interface_calls(): - if ifcall.ifname == interface.name: - self.o(_("Found circular interface class")) - return - try: - newif = if_by_name[ifcall.ifname] - except KeyError: - self.o(_("Missing interface definition for %s" % ifcall.ifname)) - continue - - stack.append((newif, ifcall)) - - - def expand_ifcalls(self, headers): - # Create a map of interface names to interfaces - - # this mirrors the interface vector map we already - # have. - if_by_name = { } - - for i in itertools.chain(headers.interfaces(), headers.templates()): - if_by_name[i.name] = i - - - for interface in itertools.chain(headers.interfaces(), headers.templates()): - self.do_expand_ifcalls(interface, if_by_name) - |