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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
24search = sepolicy.search
25info = sepolicy.info
26__all__ = ['setrans', ]
27
28
29def _entrypoint(src):
30    trans = search([sepolicy.ALLOW], {sepolicy.SOURCE: src})
31    return map(lambda y: y[sepolicy.TARGET], filter(lambda x: "entrypoint" in x[sepolicy.PERMS], trans))
32
33
34def _get_trans(src):
35    return search([sepolicy.TRANSITION], {sepolicy.SOURCE: src, sepolicy.CLASS: "process"})
36
37
38class 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"] = map(lambda y: y, filter(lambda x: x["transtype"] == self.dest, trans))
59            self.sdict[source]["child"] = 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