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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" | |
8b197c3a | 39 | #include "fileio.h" |
ffbd2c4d NC |
40 | #include "log.h" |
41 | #include "label.h" | |
42 | ||
a4783bd1 | 43 | #define SMACK_CONFIG "/etc/smack/accesses.d/" |
a1c9563c | 44 | #define CIPSO_CONFIG "/etc/smack/cipso.d/" |
ffbd2c4d | 45 | |
2b3e18de KL |
46 | #ifdef HAVE_SMACK |
47 | ||
a4783bd1 ZJS |
48 | static int write_rules(const char* dstpath, const char* srcdir) { |
49 | _cleanup_fclose_ FILE *dst = NULL; | |
ffbd2c4d NC |
50 | _cleanup_closedir_ DIR *dir = NULL; |
51 | struct dirent *entry; | |
52 | char buf[NAME_MAX]; | |
53 | int dfd = -1; | |
a4783bd1 | 54 | int r = 0; |
ffbd2c4d | 55 | |
a4783bd1 ZJS |
56 | dst = fopen(dstpath, "we"); |
57 | if (!dst) { | |
58 | if (errno != ENOENT) | |
56f64d95 | 59 | log_warning_errno(errno, "Failed to open %s: %m", dstpath); |
a4783bd1 | 60 | return -errno; /* negative error */ |
ffbd2c4d NC |
61 | } |
62 | ||
a4783bd1 ZJS |
63 | /* write rules to dst from every file in the directory */ |
64 | dir = opendir(srcdir); | |
ffbd2c4d | 65 | if (!dir) { |
a4783bd1 | 66 | if (errno != ENOENT) |
56f64d95 | 67 | log_warning_errno(errno, "Failed to opendir %s: %m", srcdir); |
a4783bd1 | 68 | return errno; /* positive on purpose */ |
ffbd2c4d NC |
69 | } |
70 | ||
71 | dfd = dirfd(dir); | |
fea7838e | 72 | assert(dfd >= 0); |
ffbd2c4d NC |
73 | |
74 | FOREACH_DIRENT(entry, dir, return 0) { | |
a4783bd1 | 75 | int fd; |
ffbd2c4d | 76 | _cleanup_fclose_ FILE *policy = NULL; |
ffbd2c4d | 77 | |
a4783bd1 ZJS |
78 | fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC); |
79 | if (fd < 0) { | |
80 | if (r == 0) | |
81 | r = -errno; | |
56f64d95 | 82 | log_warning_errno(errno, "Failed to open %s: %m", entry->d_name); |
ffbd2c4d NC |
83 | continue; |
84 | } | |
85 | ||
a4783bd1 | 86 | policy = fdopen(fd, "re"); |
ffbd2c4d | 87 | if (!policy) { |
a4783bd1 ZJS |
88 | if (r == 0) |
89 | r = -errno; | |
03e334a1 | 90 | safe_close(fd); |
56f64d95 | 91 | log_error_errno(errno, "Failed to open %s: %m", entry->d_name); |
ffbd2c4d NC |
92 | continue; |
93 | } | |
94 | ||
ffbd2c4d | 95 | /* load2 write rules in the kernel require a line buffered stream */ |
fea7838e | 96 | FOREACH_LINE(buf, policy, |
56f64d95 | 97 | log_error_errno(errno, "Failed to read line from %s: %m", |
fea7838e | 98 | entry->d_name)) { |
a4783bd1 ZJS |
99 | if (!fputs(buf, dst)) { |
100 | if (r == 0) | |
101 | r = -EINVAL; | |
102 | log_error("Failed to write line to %s", dstpath); | |
103 | break; | |
104 | } | |
105 | if (fflush(dst)) { | |
106 | if (r == 0) | |
107 | r = -errno; | |
56f64d95 | 108 | log_error_errno(errno, "Failed to flush writes to %s: %m", dstpath); |
a4783bd1 ZJS |
109 | break; |
110 | } | |
ffbd2c4d NC |
111 | } |
112 | } | |
113 | ||
a4783bd1 ZJS |
114 | return r; |
115 | } | |
116 | ||
2b3e18de | 117 | #endif |
ffbd2c4d | 118 | |
8a188de9 | 119 | int mac_smack_setup(bool *loaded_policy) { |
2b3e18de KL |
120 | |
121 | #ifdef HAVE_SMACK | |
122 | ||
a4783bd1 ZJS |
123 | int r; |
124 | ||
e49d3c01 ŁS |
125 | assert(loaded_policy); |
126 | ||
a4783bd1 ZJS |
127 | r = write_rules("/sys/fs/smackfs/load2", SMACK_CONFIG); |
128 | switch(r) { | |
129 | case -ENOENT: | |
130 | log_debug("Smack is not enabled in the kernel."); | |
131 | return 0; | |
132 | case ENOENT: | |
133 | log_debug("Smack access rules directory " SMACK_CONFIG " not found"); | |
134 | return 0; | |
135 | case 0: | |
136 | log_info("Successfully loaded Smack policies."); | |
abbacb1d NC |
137 | break; |
138 | default: | |
139 | log_warning("Failed to load Smack access rules: %s, ignoring.", | |
140 | strerror(abs(r))); | |
141 | return 0; | |
142 | } | |
143 | ||
8b197c3a AK |
144 | #ifdef SMACK_RUN_LABEL |
145 | r = write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL); | |
146 | if (r) | |
147 | log_warning("Failed to set SMACK label \"%s\" on self: %s", | |
148 | SMACK_RUN_LABEL, strerror(-r)); | |
149 | #endif | |
150 | ||
abbacb1d NC |
151 | r = write_rules("/sys/fs/smackfs/cipso2", CIPSO_CONFIG); |
152 | switch(r) { | |
153 | case -ENOENT: | |
154 | log_debug("Smack/CIPSO is not enabled in the kernel."); | |
155 | return 0; | |
156 | case ENOENT: | |
157 | log_debug("Smack/CIPSO access rules directory " CIPSO_CONFIG " not found"); | |
158 | return 0; | |
159 | case 0: | |
160 | log_info("Successfully loaded Smack/CIPSO policies."); | |
b9289d4c | 161 | break; |
a4783bd1 | 162 | default: |
abbacb1d | 163 | log_warning("Failed to load Smack/CIPSO access rules: %s, ignoring.", |
a4783bd1 ZJS |
164 | strerror(abs(r))); |
165 | return 0; | |
166 | } | |
2b3e18de | 167 | |
e49d3c01 ŁS |
168 | *loaded_policy = true; |
169 | ||
2b3e18de KL |
170 | #endif |
171 | ||
172 | return 0; | |
ffbd2c4d | 173 | } |