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policygen.py
# 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 and algorithms for the generation of SELinux policy. """ import itertools import textwrap import selinux.audit2why as audit2why try: from setools import * except: pass from . import refpolicy from . import objectmodel from . import access from . import interfaces from . import matching from . import util # Constants for the level of explanation from the generation # routines NO_EXPLANATION = 0 SHORT_EXPLANATION = 1 LONG_EXPLANATION = 2 class PolicyGenerator: """Generate a reference policy module from access vectors. PolicyGenerator generates a new reference policy module or updates an existing module based on requested access in the form of access vectors. It generates allow rules and optionally module require statements, reference policy interfaces, and extended permission access vector rules. By default only allow rules are generated. The methods .set_gen_refpol, .set_gen_requires and .set_gen_xperms turns on interface generation, requires generation, and xperms rules genration respectively. PolicyGenerator can also optionally add comments explaining why a particular access was allowed based on the audit messages that generated the access. The access vectors passed in must have the .audit_msgs field set correctly and .explain set to SHORT|LONG_EXPLANATION to enable this feature. The module created by PolicyGenerator can be passed to output.ModuleWriter to output a text representation. """ def __init__(self, module=None): """Initialize a PolicyGenerator with an optional existing module. If the module paramater is not None then access will be added to the passed in module. Otherwise a new reference policy module will be created. """ self.ifgen = None self.explain = NO_EXPLANATION self.gen_requires = False if module: self.module = module else: self.module = refpolicy.Module() self.dontaudit = False self.xperms = False self.domains = None def set_gen_refpol(self, if_set=None, perm_maps=None): """Set whether reference policy interfaces are generated. To turn on interface generation pass in an interface set to use for interface generation. To turn off interface generation pass in None. If interface generation is enabled requires generation will also be enabled. """ if if_set: self.ifgen = InterfaceGenerator(if_set, perm_maps) self.gen_requires = True else: self.ifgen = None self.__set_module_style() def set_gen_requires(self, status=True): """Set whether module requires are generated. Passing in true will turn on requires generation and False will disable generation. If requires generation is disabled interface generation will also be disabled and can only be re-enabled via .set_gen_refpol. """ self.gen_requires = status def set_gen_explain(self, explain=SHORT_EXPLANATION): """Set whether access is explained. """ self.explain = explain def set_gen_dontaudit(self, dontaudit): self.dontaudit = dontaudit def set_gen_xperms(self, xperms): """Set whether extended permission access vector rules are generated. """ self.xperms = xperms def __set_module_style(self): if self.ifgen: refpolicy = True else: refpolicy = False for mod in self.module.module_declarations(): mod.refpolicy = refpolicy def set_module_name(self, name, version="1.0"): """Set the name of the module and optionally the version. """ # find an existing module declaration m = None for mod in self.module.module_declarations(): m = mod if not m: m = refpolicy.ModuleDeclaration() self.module.children.insert(0, m) m.name = name m.version = version if self.ifgen: m.refpolicy = True else: m.refpolicy = False def get_module(self): # Generate the requires if self.gen_requires: gen_requires(self.module) """Return the generated module""" return self.module def __add_av_rule(self, av): """Add access vector rule. """ rule = refpolicy.AVRule(av) if self.dontaudit: rule.rule_type = rule.DONTAUDIT rule.comment = "" if self.explain: rule.comment = str(refpolicy.Comment(explain_access(av, verbosity=self.explain))) if av.type == audit2why.ALLOW: rule.comment += "\n#!!!! This avc is allowed in the current policy" if av.xperms: rule.comment += "\n#!!!! This av rule may have been overridden by an extended permission av rule" if av.type == audit2why.DONTAUDIT: rule.comment += "\n#!!!! This avc has a dontaudit rule in the current policy" if av.type == audit2why.BOOLEAN: if len(av.data) > 1: rule.comment += "\n#!!!! This avc can be allowed using one of the these booleans:\n# %s" % ", ".join([x[0] for x in av.data]) else: rule.comment += "\n#!!!! This avc can be allowed using the boolean '%s'" % av.data[0][0] if av.type == audit2why.CONSTRAINT: rule.comment += "\n#!!!! This avc is a constraint violation. You would need to modify the attributes of either the source or target types to allow this access." rule.comment += "\n#Constraint rule: " rule.comment += "\n#\t" + av.data[0] for reason in av.data[1:]: rule.comment += "\n#\tPossible cause is the source %s and target %s are different." % reason try: if ( av.type == audit2why.TERULE and "write" in av.perms and ( "dir" in av.obj_class or "open" in av.perms )): if not self.domains: self.domains = seinfo(ATTRIBUTE, name="domain")[0]["types"] types=[] for i in [x[TCONTEXT] for x in sesearch([ALLOW], {SCONTEXT: av.src_type, CLASS: av.obj_class, PERMS: av.perms})]: if i not in self.domains: types.append(i) if len(types) == 1: rule.comment += "\n#!!!! The source type '%s' can write to a '%s' of the following type:\n# %s\n" % ( av.src_type, av.obj_class, ", ".join(types)) elif len(types) >= 1: rule.comment += "\n#!!!! The source type '%s' can write to a '%s' of the following types:\n# %s\n" % ( av.src_type, av.obj_class, ", ".join(types)) except: pass self.module.children.append(rule) def __add_ext_av_rules(self, av): """Add extended permission access vector rules. """ for op in av.xperms.keys(): extrule = refpolicy.AVExtRule(av, op) if self.dontaudit: extrule.rule_type = extrule.DONTAUDITXPERM self.module.children.append(extrule) def add_access(self, av_set): """Add the access from the access vector set to this module. """ # Use the interface generator to split the access # into raw allow rules and interfaces. After this # a will contain a list of access that should be # used as raw allow rules and the interfaces will # be added to the module. if self.ifgen: raw_allow, ifcalls = self.ifgen.gen(av_set, self.explain) self.module.children.extend(ifcalls) else: raw_allow = av_set # Generate the raw allow rules from the filtered list for av in raw_allow: self.__add_av_rule(av) if self.xperms and av.xperms: self.__add_ext_av_rules(av) def add_role_types(self, role_type_set): for role_type in role_type_set: self.module.children.append(role_type) def explain_access(av, ml=None, verbosity=SHORT_EXPLANATION): """Explain why a policy statement was generated. Return a string containing a text explanation of why a policy statement was generated. The string is commented and wrapped and can be directly inserted into a policy. Params: av - access vector representing the access. Should have .audit_msgs set appropriately. verbosity - the amount of explanation provided. Should be set to NO_EXPLANATION, SHORT_EXPLANATION, or LONG_EXPLANATION. Returns: list of strings - strings explaining the access or an empty string if verbosity=NO_EXPLANATION or there is not sufficient information to provide an explanation. """ s = [] def explain_interfaces(): if not ml: return s.append(" Interface options:") for match in ml.all(): ifcall = call_interface(match.interface, ml.av) s.append(' %s # [%d]' % (ifcall.to_string(), match.dist)) # Format the raw audit data to explain why the # access was requested - either long or short. if verbosity == LONG_EXPLANATION: for msg in av.audit_msgs: s.append(' %s' % msg.header) s.append(' scontext="%s" tcontext="%s"' % (str(msg.scontext), str(msg.tcontext))) s.append(' class="%s" perms="%s"' % (msg.tclass, refpolicy.list_to_space_str(msg.accesses))) s.append(' comm="%s" exe="%s" path="%s"' % (msg.comm, msg.exe, msg.path)) s.extend(textwrap.wrap('message="' + msg.message + '"', 80, initial_indent=" ", subsequent_indent=" ")) explain_interfaces() elif verbosity: s.append(' src="%s" tgt="%s" class="%s", perms="%s"' % (av.src_type, av.tgt_type, av.obj_class, av.perms.to_space_str())) # For the short display we are only going to use the additional information # from the first audit message. For the vast majority of cases this info # will always be the same anyway. if len(av.audit_msgs) > 0: msg = av.audit_msgs[0] s.append(' comm="%s" exe="%s" path="%s"' % (msg.comm, msg.exe, msg.path)) explain_interfaces() return s def call_interface(interface, av): params = [] args = [] params.extend(interface.params.values()) params.sort(key=lambda param: param.num, reverse=True) ifcall = refpolicy.InterfaceCall() ifcall.ifname = interface.name for i in range(len(params)): if params[i].type == refpolicy.SRC_TYPE: ifcall.args.append(av.src_type) elif params[i].type == refpolicy.TGT_TYPE: ifcall.args.append(av.tgt_type) elif params[i].type == refpolicy.OBJ_CLASS: ifcall.args.append(av.obj_class) else: print(params[i].type) assert(0) assert(len(ifcall.args) > 0) return ifcall class InterfaceGenerator: def __init__(self, ifs, perm_maps=None): self.ifs = ifs self.hack_check_ifs(ifs) self.matcher = matching.AccessMatcher(perm_maps) self.calls = [] def hack_check_ifs(self, ifs): # FIXME: Disable interfaces we can't call - this is a hack. # Because we don't handle roles, multiple paramaters, etc., # etc., we must make certain we can actually use a returned # interface. for x in ifs.interfaces.values(): params = [] params.extend(x.params.values()) params.sort(key=lambda param: param.num, reverse=True) for i in range(len(params)): # Check that the paramater position matches # the number (e.g., $1 is the first arg). This # will fail if the parser missed something. if (i + 1) != params[i].num: x.enabled = False break # Check that we can handle the param type (currently excludes # roles. if params[i].type not in [refpolicy.SRC_TYPE, refpolicy.TGT_TYPE, refpolicy.OBJ_CLASS]: x.enabled = False break def gen(self, avs, verbosity): raw_av = self.match(avs) ifcalls = [] for ml in self.calls: ifcall = call_interface(ml.best().interface, ml.av) if verbosity: ifcall.comment = refpolicy.Comment(explain_access(ml.av, ml, verbosity)) ifcalls.append((ifcall, ml)) d = [] for ifcall, ifs in ifcalls: found = False for o_ifcall in d: if o_ifcall.matches(ifcall): if o_ifcall.comment and ifcall.comment: o_ifcall.comment.merge(ifcall.comment) found = True if not found: d.append(ifcall) return (raw_av, d) def match(self, avs): raw_av = [] for av in avs: ans = matching.MatchList() self.matcher.search_ifs(self.ifs, av, ans) if len(ans): self.calls.append(ans) else: raw_av.append(av) return raw_av def gen_requires(module): """Add require statements to the module. """ def collect_requires(node): r = refpolicy.Require() for avrule in node.avrules(): r.types.update(avrule.src_types) r.types.update(avrule.tgt_types) for obj in avrule.obj_classes: r.add_obj_class(obj, avrule.perms) for ifcall in node.interface_calls(): for arg in ifcall.args: # FIXME - handle non-type arguments when we # can actually figure those out. r.types.add(arg) for role_type in node.role_types(): r.roles.add(role_type.role) r.types.update(role_type.types) r.types.discard("self") node.children.insert(0, r) # FUTURE - this is untested on modules with any sort of # nesting for node in module.nodes(): collect_requires(node)
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