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81611586 RS |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | Copyright (C) 2012 Roberto Sassu - Politecnico di Torino, Italy | |
ccddd104 | 6 | TORSEC group — http://security.polito.it |
81611586 RS |
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 | |
81611586 RS |
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. |
81611586 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
81611586 RS |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
81611586 | 22 | #include <errno.h> |
cf0fbc49 | 23 | #include <unistd.h> |
81611586 | 24 | |
3ffd4af2 | 25 | #include "fd-util.h" |
0d39fa9c | 26 | #include "fileio.h" |
81611586 | 27 | #include "ima-setup.h" |
81611586 | 28 | #include "log.h" |
3ffd4af2 | 29 | #include "util.h" |
81611586 RS |
30 | |
31 | #define IMA_SECFS_DIR "/sys/kernel/security/ima" | |
32 | #define IMA_SECFS_POLICY IMA_SECFS_DIR "/policy" | |
33 | #define IMA_POLICY_PATH "/etc/ima/ima-policy" | |
34 | ||
35 | int ima_setup(void) { | |
349cc4a5 | 36 | #if HAVE_IMA |
92994160 ZJS |
37 | _cleanup_fclose_ FILE *input = NULL; |
38 | _cleanup_close_ int imafd = -1; | |
39 | unsigned lineno = 0; | |
40 | char line[page_size()]; | |
4ab72d6f | 41 | |
4dfb1892 | 42 | if (access(IMA_SECFS_DIR, F_OK) < 0) { |
4ab72d6f WW |
43 | log_debug("IMA support is disabled in the kernel, ignoring."); |
44 | return 0; | |
45 | } | |
46 | ||
e8e42b31 SB |
47 | if (access(IMA_SECFS_POLICY, W_OK) < 0) { |
48 | log_warning("Another IMA custom policy has already been loaded, ignoring."); | |
49 | return 0; | |
50 | } | |
51 | ||
a2c74c0c BG |
52 | if (access(IMA_POLICY_PATH, F_OK) < 0) { |
53 | log_debug("No IMA custom policy file "IMA_POLICY_PATH", ignoring."); | |
54 | return 0; | |
55 | } | |
56 | ||
e8e42b31 SB |
57 | imafd = open(IMA_SECFS_POLICY, O_WRONLY|O_CLOEXEC); |
58 | if (imafd < 0) { | |
59 | log_error_errno(errno, "Failed to open the IMA kernel interface "IMA_SECFS_POLICY", ignoring: %m"); | |
60 | return 0; | |
61 | } | |
62 | ||
63 | /* attempt to write the name of the policy file into sysfs file */ | |
64 | if (write(imafd, IMA_POLICY_PATH, strlen(IMA_POLICY_PATH)) > 0) | |
65 | goto done; | |
66 | ||
67 | /* fall back to copying the policy line-by-line */ | |
92994160 ZJS |
68 | input = fopen(IMA_POLICY_PATH, "re"); |
69 | if (!input) { | |
a2c74c0c | 70 | log_warning_errno(errno, "Failed to open the IMA custom policy file "IMA_POLICY_PATH", ignoring: %m"); |
4ab72d6f WW |
71 | return 0; |
72 | } | |
73 | ||
e8e42b31 | 74 | close(imafd); |
4ab72d6f WW |
75 | |
76 | imafd = open(IMA_SECFS_POLICY, O_WRONLY|O_CLOEXEC); | |
77 | if (imafd < 0) { | |
4dfb1892 ZJS |
78 | log_error_errno(errno, "Failed to open the IMA kernel interface "IMA_SECFS_POLICY", ignoring: %m"); |
79 | return 0; | |
4ab72d6f WW |
80 | } |
81 | ||
92994160 ZJS |
82 | FOREACH_LINE(line, input, |
83 | return log_error_errno(errno, "Failed to read the IMA custom policy file "IMA_POLICY_PATH": %m")) { | |
84 | size_t len; | |
116b6c86 | 85 | |
92994160 ZJS |
86 | len = strlen(line); |
87 | lineno++; | |
116b6c86 | 88 | |
92994160 ZJS |
89 | if (len > 0 && write(imafd, line, len) < 0) |
90 | return log_error_errno(errno, "Failed to load the IMA custom policy file "IMA_POLICY_PATH"%u: %m", | |
91 | lineno); | |
92 | } | |
4ab72d6f | 93 | |
e8e42b31 | 94 | done: |
92994160 | 95 | log_info("Successfully loaded the IMA custom policy "IMA_POLICY_PATH"."); |
81611586 | 96 | #endif /* HAVE_IMA */ |
92994160 | 97 | return 0; |
81611586 | 98 | } |