1#!/usr/bin/python
2
3import dbus
4import dbus.service
5import dbus.mainloop.glib
6import gobject
7import slip.dbus.service
8from slip.dbus import polkit
9import os
10import selinux
11from subprocess import Popen, PIPE, STDOUT
12
13
14class selinux_server(slip.dbus.service.Object):
15    default_polkit_auth_required = "org.selinux.semanage"
16
17    def __init__(self, *p, **k):
18        super(selinux_server, self).__init__(*p, **k)
19
20    #
21    # The semanage method runs a transaction on a series of semanage commands,
22    # these commnds can take the output of customized
23    #
24    @slip.dbus.polkit.require_auth("org.selinux.semanage")
25    @dbus.service.method("org.selinux", in_signature='s')
26    def semanage(self, buf):
27        p = Popen(["/usr/sbin/semanage", "import"], stdout=PIPE, stderr=PIPE, stdin=PIPE)
28        p.stdin.write(buf)
29        output = p.communicate()
30        if p.returncode and p.returncode != 0:
31            raise dbus.exceptions.DBusException(output[1])
32
33    #
34    # The customized method will return all of the custommizations for policy
35    # on the server.  This output can be used with the semanage method on
36    # another server to make the two systems have duplicate policy.
37    #
38    @slip.dbus.polkit.require_auth("org.selinux.customized")
39    @dbus.service.method("org.selinux", in_signature='', out_signature='s')
40    def customized(self):
41        p = Popen(["/usr/sbin/semanage", "export"], stdout=PIPE, stderr=PIPE)
42        buf = p.stdout.read()
43        output = p.communicate()
44        if p.returncode and p.returncode != 0:
45            raise OSError("Failed to read SELinux configuration: %s", output)
46        return buf
47
48    #
49    # The semodule_list method will return the output of semodule -l, using the customized polkit,
50    # since this is a readonly behaviour
51    #
52    @slip.dbus.polkit.require_auth("org.selinux.semodule_list")
53    @dbus.service.method("org.selinux", in_signature='', out_signature='s')
54    def semodule_list(self):
55        p = Popen(["/usr/sbin/semodule", "-l"], stdout=PIPE, stderr=PIPE)
56        buf = p.stdout.read()
57        output = p.communicate()
58        if p.returncode and p.returncode != 0:
59            raise OSError("Failed to list SELinux modules: %s", output)
60        return buf
61
62    #
63    # The restorecon method modifies any file path to the default system label
64    #
65    @slip.dbus.polkit.require_auth("org.selinux.restorecon")
66    @dbus.service.method("org.selinux", in_signature='s')
67    def restorecon(self, path):
68        selinux.restorecon(str(path), recursive=1)
69
70    #
71    # The setenforce method turns off the current enforcement of SELinux
72    #
73    @slip.dbus.polkit.require_auth("org.selinux.setenforce")
74    @dbus.service.method("org.selinux", in_signature='i')
75    def setenforce(self, value):
76        selinux.security_setenforce(value)
77
78    #
79    # The setenforce method turns off the current enforcement of SELinux
80    #
81    @slip.dbus.polkit.require_auth("org.selinux.relabel_on_boot")
82    @dbus.service.method("org.selinux", in_signature='i')
83    def relabel_on_boot(self, value):
84        if value == 1:
85            fd = open("/.autorelabel", "w")
86            fd.close()
87        else:
88            os.unlink("/.autorelabel")
89
90    def write_selinux_config(self, enforcing=None, policy=None):
91        path = selinux.selinux_path() + "config"
92        backup_path = path + ".bck"
93        fd = open(path)
94        lines = fd.readlines()
95        fd.close()
96        fd = open(backup_path, "w")
97        for l in lines:
98            if enforcing and l.startswith("SELINUX="):
99                fd.write("SELINUX=%s\n" % enforcing)
100                continue
101            if policy and l.startswith("SELINUXTYPE="):
102                fd.write("SELINUXTYPE=%s\n" % policy)
103                continue
104            fd.write(l)
105        fd.close()
106        os.rename(backup_path, path)
107
108    #
109    # The change_default_enforcement modifies the current enforcement mode
110    #
111    @slip.dbus.polkit.require_auth("org.selinux.change_default_mode")
112    @dbus.service.method("org.selinux", in_signature='s')
113    def change_default_mode(self, value):
114        values = ["enforcing", "permissive", "disabled"]
115        if value not in values:
116            raise ValueError("Enforcement mode must be %s" % ", ".join(values))
117        self.write_selinux_config(enforcing=value)
118
119    #
120    # The change_default_policy method modifies the policy type
121    #
122    @slip.dbus.polkit.require_auth("org.selinux.change_default_policy")
123    @dbus.service.method("org.selinux", in_signature='s')
124    def change_default_policy(self, value):
125        path = selinux.selinux_path() + value
126        if os.path.isdir(path):
127            return self.write_selinux_config(policy=value)
128        raise ValueError("%s does not exist" % path)
129
130if __name__ == "__main__":
131    mainloop = gobject.MainLoop()
132    dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
133    system_bus = dbus.SystemBus()
134    name = dbus.service.BusName("org.selinux", system_bus)
135    object = selinux_server(system_bus, "/org/selinux/object")
136    slip.dbus.service.set_mainloop(mainloop)
137    mainloop.run()
138