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c4dcdb9f LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
c4dcdb9f LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
c4dcdb9f | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
c4dcdb9f LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <unistd.h> | |
23 | #include <stdio.h> | |
24 | #include <errno.h> | |
c4dcdb9f LP |
25 | |
26 | #ifdef HAVE_SELINUX | |
27 | #include <selinux/selinux.h> | |
28 | #endif | |
29 | ||
30 | #include "selinux-setup.h" | |
cad45ba1 | 31 | #include "selinux-util.h" |
c4dcdb9f LP |
32 | #include "macro.h" |
33 | #include "util.h" | |
34 | #include "log.h" | |
0b3325e7 | 35 | |
f8e9f2cc | 36 | #ifdef HAVE_SELINUX |
82613b14 | 37 | _printf_(2,3) |
dbc655d5 LP |
38 | static int null_log(int type, const char *fmt, ...) { |
39 | return 0; | |
40 | } | |
f8e9f2cc | 41 | #endif |
dbc655d5 | 42 | |
8a188de9 | 43 | int mac_selinux_setup(bool *loaded_policy) { |
c4dcdb9f | 44 | |
c4dcdb9f | 45 | #ifdef HAVE_SELINUX |
4ab72d6f WW |
46 | int enforce = 0; |
47 | usec_t before_load, after_load; | |
48 | security_context_t con; | |
49 | int r; | |
50 | union selinux_callback cb; | |
68d3acac | 51 | bool initialized = false; |
4ab72d6f WW |
52 | |
53 | assert(loaded_policy); | |
54 | ||
55 | /* Turn off all of SELinux' own logging, we want to do that */ | |
56 | cb.func_log = null_log; | |
57 | selinux_set_callback(SELINUX_CB_LOG, cb); | |
58 | ||
59 | /* Don't load policy in the initrd if we don't appear to have | |
60 | * it. For the real root, we check below if we've already | |
61 | * loaded policy, and return gracefully. | |
62 | */ | |
63 | if (in_initrd() && access(selinux_path(), F_OK) < 0) | |
64 | return 0; | |
65 | ||
66 | /* Already initialized by somebody else? */ | |
67 | r = getcon_raw(&con); | |
68 | if (r == 0) { | |
4ab72d6f WW |
69 | initialized = !streq(con, "kernel"); |
70 | freecon(con); | |
4ab72d6f WW |
71 | } |
72 | ||
73 | /* Make sure we have no fds open while loading the policy and | |
74 | * transitioning */ | |
75 | log_close(); | |
76 | ||
77 | /* Now load the policy */ | |
78 | before_load = now(CLOCK_MONOTONIC); | |
79 | r = selinux_init_load_policy(&enforce); | |
80 | if (r == 0) { | |
81 | char timespan[FORMAT_TIMESPAN_MAX]; | |
82 | char *label; | |
83 | ||
6baa7db0 | 84 | mac_selinux_retest(); |
4ab72d6f WW |
85 | |
86 | /* Transition to the new context */ | |
cc56fafe | 87 | r = mac_selinux_get_create_label_from_exe(SYSTEMD_BINARY_PATH, &label); |
4ab72d6f WW |
88 | if (r < 0 || label == NULL) { |
89 | log_open(); | |
90 | log_error("Failed to compute init label, ignoring."); | |
91 | } else { | |
92 | r = setcon(label); | |
93 | ||
94 | log_open(); | |
95 | if (r < 0) | |
96 | log_error("Failed to transition into init label '%s', ignoring.", label); | |
97 | ||
cc56fafe | 98 | mac_selinux_free(label); |
4ab72d6f WW |
99 | } |
100 | ||
101 | after_load = now(CLOCK_MONOTONIC); | |
102 | ||
103 | log_info("Successfully loaded SELinux policy in %s.", | |
104 | format_timespan(timespan, sizeof(timespan), after_load - before_load, 0)); | |
105 | ||
106 | *loaded_policy = true; | |
107 | ||
108 | } else { | |
109 | log_open(); | |
110 | ||
111 | if (enforce > 0) { | |
68d3acac | 112 | if (!initialized) { |
cb6531be | 113 | log_emergency("Failed to load SELinux policy."); |
68d3acac WW |
114 | return -EIO; |
115 | } | |
116 | ||
117 | log_warning("Failed to load new SELinux policy. Continuing with old policy."); | |
4ab72d6f WW |
118 | } else |
119 | log_debug("Unable to load SELinux policy. Ignoring."); | |
120 | } | |
c4dcdb9f LP |
121 | #endif |
122 | ||
4ab72d6f | 123 | return 0; |
c4dcdb9f | 124 | } |