diff --git a/sepolgen-1.2.2/src/sepolgen/access.py b/sepolgen-1.2.2/src/sepolgen/access.py index cf13210..9154887 100644 --- a/sepolgen-1.2.2/src/sepolgen/access.py +++ b/sepolgen-1.2.2/src/sepolgen/access.py @@ -88,6 +88,8 @@ class AccessVector: self.audit_msgs = [] self.type = audit2why.TERULE self.data = [] + self.obj_path = None + self.base_type = None # The direction of the information flow represented by this # access vector - used for matching @@ -133,6 +135,11 @@ class AccessVector: return "allow %s %s:%s %s;" % (self.src_type, self.tgt_type, self.obj_class, self.perms.to_space_str()) + def base_file_type(self): + base_type_array = [] + base_type_array = [self.base_type, self.tgt_type, self.src_type] + return base_type_array + def __cmp__(self, other): if self.src_type != other.src_type: return cmp(self.src_type, other.src_type) @@ -256,7 +263,8 @@ class AccessVectorSet: for av in l: self.add_av(AccessVector(av)) - def add(self, src_type, tgt_type, obj_class, perms, audit_msg=None, avc_type=audit2why.TERULE, data=[]): + def add(self, src_type, tgt_type, obj_class, perms, obj_path=None, + base_type=None, audit_msg=None, avc_type=audit2why.TERULE, data=[]): """Add an access vector to the set. """ tgt = self.src.setdefault(src_type, { }) @@ -269,7 +277,9 @@ class AccessVectorSet: access.src_type = src_type access.tgt_type = tgt_type access.obj_class = obj_class + access.obj_path = obj_path access.data = data + access.base_type = base_type access.type = avc_type cls[obj_class, avc_type] = access diff --git a/sepolgen-1.2.2/src/sepolgen/audit.py b/sepolgen-1.2.2/src/sepolgen/audit.py index 56919be..57263d0 100644 --- a/sepolgen-1.2.2/src/sepolgen/audit.py +++ b/sepolgen-1.2.2/src/sepolgen/audit.py @@ -169,6 +169,7 @@ class AVCMessage(AuditMessage): self.exe = "" self.path = "" self.name = "" + self.ino = "" self.accesses = [] self.denial = True self.type = audit2why.TERULE @@ -230,6 +231,10 @@ class AVCMessage(AuditMessage): self.exe = fields[1][1:-1] elif fields[0] == "name": self.name = fields[1][1:-1] + elif fields[0] == "path": + self.path = fields[1][1:-1] + elif fields[0] == "ino": + self.ino = fields[1] if not found_src or not found_tgt or not found_class or not found_access: raise ValueError("AVC message in invalid format [%s]\n" % self.message) @@ -354,7 +359,9 @@ class AuditParser: self.path_msgs = [] self.by_header = { } self.check_input_file = False - + self.inode_dict = { } + self.__store_base_types() + # Low-level parsing function - tries to determine if this audit # message is an SELinux related message and then parses it into # the appropriate AuditMessage subclass. This function deliberately @@ -492,6 +499,60 @@ class AuditParser: return role_types + def __restore_path(self, name, inode): + import subprocess + import os + path = "" + # Optimizing + if name == "" or inode == "": + return path + for d in self.inode_dict: + if d == inode and self.inode_dict[d] == name: + return path + if d == inode and self.inode_dict[d] != name: + return self.inode_dict[d] + if inode not in self.inode_dict.keys(): + self.inode_dict[inode] = name + + command = "locate -b '\%s'" % name + try: + output = subprocess.check_output(command, + stderr=subprocess.STDOUT, + shell=True) + try: + ino = int(inode) + except ValueError: + pass + for file in output.split("\n"): + try: + if int(os.lstat(file).st_ino) == ino: + self.inode_dict[inode] = path = file + return path + except: + pass + except subprocess.CalledProcessError as e: + pass + return path + + def __store_base_types(self): + import sepolicy + self.base_types = sepolicy.get_types_from_attribute("base_file_type") + + def __get_base_type(self, tcontext, scontext): + import sepolicy + # Prevent unnecessary searching + if (self.old_scontext == scontext and + self.old_tcontext == tcontext): + return + self.old_scontext = scontext + self.old_tcontext = tcontext + for btype in self.base_types: + if btype == tcontext: + for writable in sepolicy.get_writable_files(scontext): + if writable.endswith(tcontext) and writable.startswith(scontext.rstrip("_t")): + return writable + return 0 + def to_access(self, avc_filter=None, only_denials=True): """Convert the audit logs access into a an access vector set. @@ -510,16 +571,23 @@ class AuditParser: audit logs parsed by this object. """ av_set = access.AccessVectorSet() + self.old_scontext = "" + self.old_tcontext = "" for avc in self.avc_msgs: if avc.denial != True and only_denials: continue + base_type = self.__get_base_type(avc.tcontext.type, avc.scontext.type) + if avc.path == "": + avc.path = self.__restore_path(avc.name, avc.ino) if avc_filter: if avc_filter.filter(avc): av_set.add(avc.scontext.type, avc.tcontext.type, avc.tclass, - avc.accesses, avc, avc_type=avc.type, data=avc.data) + avc.accesses, avc.path, base_type, avc, + avc_type=avc.type, data=avc.data) else: av_set.add(avc.scontext.type, avc.tcontext.type, avc.tclass, - avc.accesses, avc, avc_type=avc.type, data=avc.data) + avc.accesses, avc.path, base_type, avc, + avc_type=avc.type, data=avc.data) return av_set class AVCTypeFilter: diff --git a/sepolgen-1.2.2/src/sepolgen/policygen.py b/sepolgen-1.2.2/src/sepolgen/policygen.py index 5f38577..3b9e9f4 100644 --- a/sepolgen-1.2.2/src/sepolgen/policygen.py +++ b/sepolgen-1.2.2/src/sepolgen/policygen.py @@ -81,8 +81,9 @@ class PolicyGenerator: self.module = refpolicy.Module() self.dontaudit = False - + self.mislabled = None self.domains = None + def set_gen_refpol(self, if_set=None, perm_maps=None): """Set whether reference policy interfaces are generated. @@ -152,6 +153,18 @@ class PolicyGenerator: """Return the generated module""" return self.module + def __restore_label(self, av): + import selinux + try: + context = selinux.matchpathcon(av.obj_path, 0) + split = context[1].split(":")[2] + if split != av.tgt_type: + self.mislabled = split + return + except OSError: + pass + self.mislabled = None + def __add_allow_rules(self, avs): for av in avs: rule = refpolicy.AVRule(av) @@ -160,6 +173,34 @@ class PolicyGenerator: rule.comment = "" if self.explain: rule.comment = str(refpolicy.Comment(explain_access(av, verbosity=self.explain))) + # base_type[0] == 0 means there exists a base type but not the path + # base_type[0] == None means user isn't using base type + # base_type[1] contains the target context + # base_type[2] contains the source type + base_type = av.base_file_type() + if base_type[0] == 0 and av.type != audit2why.ALLOW: + rule.comment += "\n#!!!! WARNING: '%s' is a base type." % "".join(base_type[1]) + for perm in av.perms: + if perm == "write" or perm == "create": + permission = True + break + else: + permission = False + + # Catch perms 'write' and 'create' for base types + if (base_type[0] is not None and base_type[0] != 0 + and permission and av.type != audit2why.ALLOW): + if av.obj_class == dir: + comp = "(/.*?)" + else: + comp = "" + rule.comment += "\n#!!!! WARNING '%s' is not allowed to write or create to %s. Change the label to %s." % ("".join(base_type[2]), "".join(base_type[1]), "".join(base_type[0])) + if av.obj_path != "": + rule.comment += "\n#!!!! $ semange fcontext -a -t %s %s%s \n#!!!! $ restorecon -R -v %s" % ("".join(base_type[0]), "".join(av.obj_path), "".join(comp) ,"".join(av.obj_path)) + + self.__restore_label(av) + if self.mislabled is not None and av.type != audit2why.ALLOW: + rule.comment += "\n#!!!! The file '%s' is mislabeled on your system. \n#!!!! Fix with $ restorecon -R -v %s" % ("".join(av.obj_path), "".join(av.obj_path)) if av.type == audit2why.ALLOW: rule.comment += "\n#!!!! This avc is allowed in the current policy" if av.type == audit2why.DONTAUDIT: @@ -174,7 +215,7 @@ class PolicyGenerator: 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] + 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