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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#
23import sepolicy
24__all__ = ['setrans']
25
26
27def _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
32def _get_trans(src):
33    return sepolicy.search([sepolicy.TRANSITION], {sepolicy.SOURCE: src, sepolicy.CLASS: "process"})
34
35
36class setrans:
37
38    def __init__(self, source, dest=None):
39        self.seen = []
40        self.sdict = {}
41        self.source = source
42        self.dest = dest
43        self._process(self.source)
44
45    def _process(self, source):
46        if source in self.sdict:
47            return self.sdict[source]
48        self.sdict[source] = {}
49        trans = _get_trans(source)
50        if not trans:
51            return
52        self.sdict[source]["name"] = source
53        if not self.dest:
54            self.sdict[source]["map"] = trans
55        else:
56            self.sdict[source]["map"] = map(lambda y: y, filter(lambda x: x["transtype"] == self.dest, trans))
57            self.sdict[source]["child"] = map(lambda y: y["transtype"], filter(lambda x: x["transtype"] not in [self.dest, source], trans))
58            for s in self.sdict[source]["child"]:
59                self._process(s)
60
61    def out(self, name, header=""):
62        buf = ""
63        if name in self.seen:
64            return buf
65        self.seen.append(name)
66
67        if "map" in self.sdict[name]:
68            for t in self.sdict[name]["map"]:
69                cond = sepolicy.get_conditionals(t["source"], t["transtype"], "process", ["transition"])
70                if cond:
71                    buf += "%s%s @ %s --> %s %s\n" % (header, t["source"], t["target"], t["transtype"], sepolicy.get_conditionals_format_text(cond))
72                else:
73                    buf += "%s%s @ %s --> %s\n" % (header, t["source"], t["target"], t["transtype"])
74
75        if "child" in self.sdict[name]:
76            for x in self.sdict[name]["child"]:
77                buf += self.out(x, "%s%s ... " % (header, name))
78        return buf
79
80    def output(self):
81        self.seen = []
82        print(self.out(self.source))
83