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      1 #! /usr/bin/python -Es
      2 # Copyright (C) 2011 Red Hat
      3 # see file 'COPYING' for use and warranty information
      4 #
      5 # setrans is a tool for analyzing process transistions in SELinux policy
      6 #
      7 #    This program is free software; you can redistribute it and/or
      8 #    modify it under the terms of the GNU General Public License as
      9 #    published by the Free Software Foundation; either version 2 of
     10 #    the License, or (at your option) any later version.
     11 #
     12 #    This program is distributed in the hope that it will be useful,
     13 #    but WITHOUT ANY WARRANTY; without even the implied warranty of
     14 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15 #    GNU General Public License for more details.
     16 #
     17 #    You should have received a copy of the GNU General Public License
     18 #    along with this program; if not, write to the Free Software
     19 #    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     20 #                                        02111-1307  USA
     21 #
     22 #
     23 import sepolicy
     24 __all__ = ['setrans']
     25 
     26 
     27 def _entrypoint(src):
     28     trans = sepolicy.search([sepolicy.ALLOW], {sepolicy.SOURCE: src})
     29     return map(lambda y: y[sepolicy.TARGET], filter(lambda x: "entrypoint" in x[sepolicy.PERMS], trans))
     30 
     31 
     32 def _get_trans(src):
     33     src_list = [src] + list(filter(lambda x: x['name'] == src, sepolicy.get_all_types_info()))[0]['attributes']
     34     trans_list = list(filter(lambda x: x['source'] in src_list and x['class'] == 'process', sepolicy.get_all_transitions()))
     35     return trans_list
     36 
     37 
     38 class setrans:
     39 
     40     def __init__(self, source, dest=None):
     41         self.seen = []
     42         self.sdict = {}
     43         self.source = source
     44         self.dest = dest
     45         self._process(self.source)
     46 
     47     def _process(self, source):
     48         if source in self.sdict:
     49             return self.sdict[source]
     50         self.sdict[source] = {}
     51         trans = _get_trans(source)
     52         if not trans:
     53             return
     54         self.sdict[source]["name"] = source
     55         if not self.dest:
     56             self.sdict[source]["map"] = trans
     57         else:
     58             self.sdict[source]["map"] = list(map(lambda y: y, filter(lambda x: x["transtype"] == self.dest, trans)))
     59             self.sdict[source]["child"] = list(map(lambda y: y["transtype"], filter(lambda x: x["transtype"] not in [self.dest, source], trans)))
     60             for s in self.sdict[source]["child"]:
     61                 self._process(s)
     62 
     63     def out(self, name, header=""):
     64         buf = ""
     65         if name in self.seen:
     66             return buf
     67         self.seen.append(name)
     68 
     69         if "map" in self.sdict[name]:
     70             for t in self.sdict[name]["map"]:
     71                 cond = sepolicy.get_conditionals(t["source"], t["transtype"], "process", ["transition"])
     72                 if cond:
     73                     buf += "%s%s @ %s --> %s %s\n" % (header, t["source"], t["target"], t["transtype"], sepolicy.get_conditionals_format_text(cond))
     74                 else:
     75                     buf += "%s%s @ %s --> %s\n" % (header, t["source"], t["target"], t["transtype"])
     76 
     77         if "child" in self.sdict[name]:
     78             for x in self.sdict[name]["child"]:
     79                 buf += self.out(x, "%s%s ... " % (header, name))
     80         return buf
     81 
     82     def output(self):
     83         self.seen = []
     84         print(self.out(self.source))
     85