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ffbd2c4d NC |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright (C) 2013 Intel Corporation | |
7 | Authors: | |
8 | Nathaniel Chen <nathaniel.chen@intel.com> | |
9 | ||
10 | systemd is free software; you can redistribute it and/or modify it | |
11 | under the terms of the GNU Lesser General Public License as published | |
12 | by the Free Software Foundation; either version 2.1 of the License, | |
13 | or (at your option) any later version. | |
14 | ||
15 | systemd is distributed in the hope that it will be useful, but | |
16 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | Lesser General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU Lesser General Public License | |
21 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
22 | ***/ | |
23 | ||
24 | #include <stdio.h> | |
25 | #include <errno.h> | |
26 | #include <string.h> | |
27 | #include <unistd.h> | |
28 | #include <stdlib.h> | |
29 | #include <sys/vfs.h> | |
30 | #include <fcntl.h> | |
31 | #include <sys/types.h> | |
32 | #include <dirent.h> | |
33 | #include <sys/mount.h> | |
34 | #include <stdint.h> | |
35 | ||
36 | #include "macro.h" | |
37 | #include "smack-setup.h" | |
38 | #include "util.h" | |
39 | #include "log.h" | |
40 | #include "label.h" | |
41 | ||
a4783bd1 | 42 | #define SMACK_CONFIG "/etc/smack/accesses.d/" |
abbacb1d | 43 | #define CIPSO_CONFIG "/etc/smack/cipso/" |
ffbd2c4d | 44 | |
a4783bd1 ZJS |
45 | static int write_rules(const char* dstpath, const char* srcdir) { |
46 | _cleanup_fclose_ FILE *dst = NULL; | |
ffbd2c4d NC |
47 | _cleanup_closedir_ DIR *dir = NULL; |
48 | struct dirent *entry; | |
49 | char buf[NAME_MAX]; | |
50 | int dfd = -1; | |
a4783bd1 | 51 | int r = 0; |
ffbd2c4d | 52 | |
a4783bd1 ZJS |
53 | dst = fopen(dstpath, "we"); |
54 | if (!dst) { | |
55 | if (errno != ENOENT) | |
56 | log_warning("Failed to open %s: %m", dstpath); | |
57 | return -errno; /* negative error */ | |
ffbd2c4d NC |
58 | } |
59 | ||
a4783bd1 ZJS |
60 | /* write rules to dst from every file in the directory */ |
61 | dir = opendir(srcdir); | |
ffbd2c4d | 62 | if (!dir) { |
a4783bd1 ZJS |
63 | if (errno != ENOENT) |
64 | log_warning("Failed to opendir %s: %m", srcdir); | |
65 | return errno; /* positive on purpose */ | |
ffbd2c4d NC |
66 | } |
67 | ||
68 | dfd = dirfd(dir); | |
fea7838e | 69 | assert(dfd >= 0); |
ffbd2c4d NC |
70 | |
71 | FOREACH_DIRENT(entry, dir, return 0) { | |
a4783bd1 | 72 | int fd; |
ffbd2c4d | 73 | _cleanup_fclose_ FILE *policy = NULL; |
ffbd2c4d | 74 | |
a4783bd1 ZJS |
75 | fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC); |
76 | if (fd < 0) { | |
77 | if (r == 0) | |
78 | r = -errno; | |
79 | log_warning("Failed to open %s: %m", entry->d_name); | |
ffbd2c4d NC |
80 | continue; |
81 | } | |
82 | ||
a4783bd1 | 83 | policy = fdopen(fd, "re"); |
ffbd2c4d | 84 | if (!policy) { |
a4783bd1 ZJS |
85 | if (r == 0) |
86 | r = -errno; | |
87 | close_nointr_nofail(fd); | |
88 | log_error("Failed to open %s: %m", entry->d_name); | |
ffbd2c4d NC |
89 | continue; |
90 | } | |
91 | ||
ffbd2c4d | 92 | /* load2 write rules in the kernel require a line buffered stream */ |
fea7838e | 93 | FOREACH_LINE(buf, policy, |
a4783bd1 | 94 | log_error("Failed to read line from %s: %m", |
fea7838e | 95 | entry->d_name)) { |
a4783bd1 ZJS |
96 | if (!fputs(buf, dst)) { |
97 | if (r == 0) | |
98 | r = -EINVAL; | |
99 | log_error("Failed to write line to %s", dstpath); | |
100 | break; | |
101 | } | |
102 | if (fflush(dst)) { | |
103 | if (r == 0) | |
104 | r = -errno; | |
105 | log_error("Failed to flush writes to %s: %m", dstpath); | |
106 | break; | |
107 | } | |
ffbd2c4d NC |
108 | } |
109 | } | |
110 | ||
a4783bd1 ZJS |
111 | return r; |
112 | } | |
113 | ||
ffbd2c4d | 114 | |
a4783bd1 ZJS |
115 | int smack_setup(void) { |
116 | int r; | |
117 | ||
118 | r = write_rules("/sys/fs/smackfs/load2", SMACK_CONFIG); | |
119 | switch(r) { | |
120 | case -ENOENT: | |
121 | log_debug("Smack is not enabled in the kernel."); | |
122 | return 0; | |
123 | case ENOENT: | |
124 | log_debug("Smack access rules directory " SMACK_CONFIG " not found"); | |
125 | return 0; | |
126 | case 0: | |
127 | log_info("Successfully loaded Smack policies."); | |
abbacb1d NC |
128 | break; |
129 | default: | |
130 | log_warning("Failed to load Smack access rules: %s, ignoring.", | |
131 | strerror(abs(r))); | |
132 | return 0; | |
133 | } | |
134 | ||
135 | r = write_rules("/sys/fs/smackfs/cipso2", CIPSO_CONFIG); | |
136 | switch(r) { | |
137 | case -ENOENT: | |
138 | log_debug("Smack/CIPSO is not enabled in the kernel."); | |
139 | return 0; | |
140 | case ENOENT: | |
141 | log_debug("Smack/CIPSO access rules directory " CIPSO_CONFIG " not found"); | |
142 | return 0; | |
143 | case 0: | |
144 | log_info("Successfully loaded Smack/CIPSO policies."); | |
a4783bd1 ZJS |
145 | return 0; |
146 | default: | |
abbacb1d | 147 | log_warning("Failed to load Smack/CIPSO access rules: %s, ignoring.", |
a4783bd1 ZJS |
148 | strerror(abs(r))); |
149 | return 0; | |
150 | } | |
ffbd2c4d | 151 | } |