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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> | |
25 | #include <string.h> | |
26 | #include <stdlib.h> | |
27 | ||
28 | #ifdef HAVE_SELINUX | |
29 | #include <selinux/selinux.h> | |
30 | #endif | |
31 | ||
32 | #include "selinux-setup.h" | |
cad45ba1 LP |
33 | #include "selinux-util.h" |
34 | #include "label.h" | |
4ef31082 | 35 | #include "mount-setup.h" |
c4dcdb9f LP |
36 | #include "macro.h" |
37 | #include "util.h" | |
38 | #include "log.h" | |
0b3325e7 | 39 | |
f8e9f2cc | 40 | #ifdef HAVE_SELINUX |
dbc655d5 LP |
41 | static int null_log(int type, const char *fmt, ...) { |
42 | return 0; | |
43 | } | |
f8e9f2cc | 44 | #endif |
dbc655d5 | 45 | |
0b3325e7 | 46 | int selinux_setup(bool *loaded_policy) { |
c4dcdb9f | 47 | |
c4dcdb9f LP |
48 | #ifdef HAVE_SELINUX |
49 | int enforce = 0; | |
0b3325e7 | 50 | usec_t before_load, after_load; |
0843f2d6 | 51 | security_context_t con; |
0b3325e7 | 52 | int r; |
dbc655d5 | 53 | union selinux_callback cb; |
0b3325e7 LP |
54 | |
55 | assert(loaded_policy); | |
c4dcdb9f | 56 | |
dbc655d5 LP |
57 | /* Turn off all of SELinux' own logging, we want to do that */ |
58 | cb.func_log = null_log; | |
59 | selinux_set_callback(SELINUX_CB_LOG, cb); | |
60 | ||
37f78db2 CW |
61 | /* Don't load policy in the initrd if we don't appear to have |
62 | * it. For the real root, we check below if we've already | |
63 | * loaded policy, and return gracefully. | |
64 | */ | |
65 | if (in_initrd() && access(selinux_path(), F_OK) < 0) | |
66 | return 0; | |
67 | ||
0b3325e7 LP |
68 | /* Already initialized by somebody else? */ |
69 | r = getcon_raw(&con); | |
70 | if (r == 0) { | |
0843f2d6 LP |
71 | bool initialized; |
72 | ||
73 | initialized = !streq(con, "kernel"); | |
74 | freecon(con); | |
75 | ||
76 | if (initialized) | |
77 | return 0; | |
78 | } | |
c4dcdb9f | 79 | |
0b3325e7 LP |
80 | /* Make sure we have no fds open while loading the policy and |
81 | * transitioning */ | |
82 | log_close(); | |
1829dc9d | 83 | |
0b3325e7 LP |
84 | /* Now load the policy */ |
85 | before_load = now(CLOCK_MONOTONIC); | |
86 | r = selinux_init_load_policy(&enforce); | |
0b3325e7 LP |
87 | if (r == 0) { |
88 | char timespan[FORMAT_TIMESPAN_MAX]; | |
89 | char *label; | |
c4dcdb9f | 90 | |
cad45ba1 | 91 | retest_selinux(); |
4d4c7486 | 92 | |
0b3325e7 LP |
93 | /* Transition to the new context */ |
94 | r = label_get_create_label_from_exe(SYSTEMD_BINARY_PATH, &label); | |
4ef31082 | 95 | if (r < 0 || label == NULL) { |
0b3325e7 LP |
96 | log_open(); |
97 | log_error("Failed to compute init label, ignoring."); | |
98 | } else { | |
99 | r = setcon(label); | |
c4dcdb9f | 100 | |
0b3325e7 LP |
101 | log_open(); |
102 | if (r < 0) | |
103 | log_error("Failed to transition into init label '%s', ignoring.", label); | |
c4dcdb9f | 104 | |
0b3325e7 LP |
105 | label_free(label); |
106 | } | |
107 | ||
108 | after_load = now(CLOCK_MONOTONIC); | |
1829dc9d | 109 | |
0b3325e7 | 110 | log_info("Successfully loaded SELinux policy in %s.", |
2fa4092c | 111 | format_timespan(timespan, sizeof(timespan), after_load - before_load, 0)); |
0b3325e7 LP |
112 | |
113 | *loaded_policy = true; | |
114 | ||
115 | } else { | |
878587bd LP |
116 | log_open(); |
117 | ||
25bafad6 | 118 | if (enforce > 0) { |
878587bd | 119 | log_error("Failed to load SELinux policy. Freezing."); |
c4dcdb9f | 120 | return -EIO; |
0b3325e7 | 121 | } else |
878587bd | 122 | log_debug("Unable to load SELinux policy. Ignoring."); |
c4dcdb9f LP |
123 | } |
124 | #endif | |
125 | ||
126 | return 0; | |
127 | } |