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52661efd LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
f23c09b0 | 6 | Copyright 2010 Lennart Poettering |
52661efd LP |
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 | |
52661efd 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. |
52661efd | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
52661efd LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <errno.h> | |
24 | #include <string.h> | |
25 | #include <unistd.h> | |
62590f23 | 26 | #include <sys/capability.h> |
52661efd | 27 | |
07e833bc MS |
28 | #ifdef HAVE_SELINUX |
29 | #include <selinux/selinux.h> | |
30 | #endif | |
31 | ||
52661efd LP |
32 | #include "util.h" |
33 | #include "condition.h" | |
8095200d | 34 | #include "virt.h" |
52661efd | 35 | |
267632f0 | 36 | Condition* condition_new(ConditionType type, const char *parameter, bool trigger, bool negate) { |
52661efd LP |
37 | Condition *c; |
38 | ||
8092a428 LP |
39 | assert(type < _CONDITION_TYPE_MAX); |
40 | ||
ab7f148f LP |
41 | c = new0(Condition, 1); |
42 | if (!c) | |
da19d5c1 LP |
43 | return NULL; |
44 | ||
52661efd | 45 | c->type = type; |
267632f0 | 46 | c->trigger = trigger; |
52661efd LP |
47 | c->negate = negate; |
48 | ||
ab7f148f LP |
49 | if (parameter) { |
50 | c->parameter = strdup(parameter); | |
51 | if (!c->parameter) { | |
d257ddef LP |
52 | free(c); |
53 | return NULL; | |
54 | } | |
ab7f148f | 55 | } |
52661efd LP |
56 | |
57 | return c; | |
58 | } | |
59 | ||
60 | void condition_free(Condition *c) { | |
61 | assert(c); | |
62 | ||
63 | free(c->parameter); | |
64 | free(c); | |
65 | } | |
66 | ||
67 | void condition_free_list(Condition *first) { | |
68 | Condition *c, *n; | |
69 | ||
70 | LIST_FOREACH_SAFE(conditions, c, n, first) | |
71 | condition_free(c); | |
72 | } | |
73 | ||
74 | static bool test_kernel_command_line(const char *parameter) { | |
75 | char *line, *w, *state, *word = NULL; | |
76 | bool equal; | |
77 | int r; | |
78 | size_t l, pl; | |
79 | bool found = false; | |
80 | ||
039655a4 LP |
81 | assert(parameter); |
82 | ||
a373b0e7 | 83 | if (detect_container(NULL) > 0) |
2fc97846 LP |
84 | return false; |
85 | ||
ab7f148f LP |
86 | r = read_one_line_file("/proc/cmdline", &line); |
87 | if (r < 0) { | |
52661efd LP |
88 | log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); |
89 | return false; | |
90 | } | |
91 | ||
92 | equal = !!strchr(parameter, '='); | |
93 | pl = strlen(parameter); | |
94 | ||
95 | FOREACH_WORD_QUOTED(w, l, line, state) { | |
96 | ||
97 | free(word); | |
ab7f148f LP |
98 | word = strndup(w, l); |
99 | if (!word) | |
52661efd LP |
100 | break; |
101 | ||
102 | if (equal) { | |
103 | if (streq(word, parameter)) { | |
104 | found = true; | |
105 | break; | |
106 | } | |
107 | } else { | |
108 | if (startswith(word, parameter) && (word[pl] == '=' || word[pl] == 0)) { | |
109 | found = true; | |
110 | break; | |
111 | } | |
112 | } | |
113 | ||
114 | } | |
115 | ||
116 | free(word); | |
117 | free(line); | |
118 | ||
119 | return found; | |
120 | } | |
121 | ||
039655a4 | 122 | static bool test_virtualization(const char *parameter) { |
8095200d LP |
123 | int b; |
124 | Virtualization v; | |
039655a4 LP |
125 | const char *id; |
126 | ||
127 | assert(parameter); | |
128 | ||
8095200d LP |
129 | v = detect_virtualization(&id); |
130 | if (v < 0) { | |
131 | log_warning("Failed to detect virtualization, ignoring: %s", strerror(-v)); | |
039655a4 LP |
132 | return false; |
133 | } | |
134 | ||
8095200d | 135 | /* First, compare with yes/no */ |
039655a4 LP |
136 | b = parse_boolean(parameter); |
137 | ||
8095200d LP |
138 | if (v > 0 && b > 0) |
139 | return true; | |
140 | ||
141 | if (v == 0 && b == 0) | |
142 | return true; | |
143 | ||
144 | /* Then, compare categorization */ | |
145 | if (v == VIRTUALIZATION_VM && streq(parameter, "vm")) | |
039655a4 LP |
146 | return true; |
147 | ||
8095200d | 148 | if (v == VIRTUALIZATION_CONTAINER && streq(parameter, "container")) |
039655a4 LP |
149 | return true; |
150 | ||
8095200d | 151 | /* Finally compare id */ |
e5396fed | 152 | return v > 0 && streq(parameter, id); |
039655a4 LP |
153 | } |
154 | ||
07e833bc MS |
155 | static bool test_security(const char *parameter) { |
156 | #ifdef HAVE_SELINUX | |
d24e1b48 | 157 | if (streq(parameter, "selinux")) |
07e833bc MS |
158 | return is_selinux_enabled() > 0; |
159 | #endif | |
160 | return false; | |
161 | } | |
162 | ||
62590f23 LP |
163 | static bool test_capability(const char *parameter) { |
164 | cap_value_t value; | |
165 | FILE *f; | |
166 | char line[LINE_MAX]; | |
167 | unsigned long long capabilities = (unsigned long long) -1; | |
168 | ||
169 | /* If it's an invalid capability, we don't have it */ | |
170 | ||
171 | if (cap_from_name(parameter, &value) < 0) | |
172 | return false; | |
173 | ||
174 | /* If it's a valid capability we default to assume | |
175 | * that we have it */ | |
176 | ||
177 | f = fopen("/proc/self/status", "re"); | |
178 | if (!f) | |
179 | return true; | |
180 | ||
181 | while (fgets(line, sizeof(line), f)) { | |
182 | truncate_nl(line); | |
183 | ||
184 | if (startswith(line, "CapBnd:")) { | |
185 | (void) sscanf(line+7, "%llx", &capabilities); | |
186 | break; | |
187 | } | |
188 | } | |
189 | ||
7670e5a2 TJ |
190 | fclose(f); |
191 | ||
62590f23 LP |
192 | return !!(capabilities & (1ULL << value)); |
193 | } | |
194 | ||
52661efd LP |
195 | bool condition_test(Condition *c) { |
196 | assert(c); | |
197 | ||
198 | switch(c->type) { | |
199 | ||
200 | case CONDITION_PATH_EXISTS: | |
201 | return (access(c->parameter, F_OK) >= 0) == !c->negate; | |
202 | ||
8092a428 LP |
203 | case CONDITION_PATH_EXISTS_GLOB: |
204 | return (glob_exists(c->parameter) > 0) == !c->negate; | |
205 | ||
2b583ce6 KS |
206 | case CONDITION_PATH_IS_DIRECTORY: { |
207 | struct stat st; | |
208 | ||
8571962c | 209 | if (stat(c->parameter, &st) < 0) |
1f8fef5a | 210 | return c->negate; |
2b583ce6 KS |
211 | return S_ISDIR(st.st_mode) == !c->negate; |
212 | } | |
213 | ||
0d60602c MS |
214 | case CONDITION_PATH_IS_SYMBOLIC_LINK: { |
215 | struct stat st; | |
216 | ||
217 | if (lstat(c->parameter, &st) < 0) | |
1f8fef5a | 218 | return c->negate; |
0d60602c MS |
219 | return S_ISLNK(st.st_mode) == !c->negate; |
220 | } | |
221 | ||
ab7f148f LP |
222 | case CONDITION_PATH_IS_MOUNT_POINT: |
223 | return (path_is_mount_point(c->parameter, true) > 0) == !c->negate; | |
224 | ||
36af55d9 LP |
225 | case CONDITION_DIRECTORY_NOT_EMPTY: { |
226 | int k; | |
227 | ||
228 | k = dir_is_empty(c->parameter); | |
229 | return !(k == -ENOENT || k > 0) == !c->negate; | |
230 | } | |
231 | ||
82e487c5 LP |
232 | case CONDITION_FILE_IS_EXECUTABLE: { |
233 | struct stat st; | |
234 | ||
34a2dc4b | 235 | if (stat(c->parameter, &st) < 0) |
1f8fef5a | 236 | return c->negate; |
82e487c5 LP |
237 | |
238 | return (S_ISREG(st.st_mode) && (st.st_mode & 0111)) == !c->negate; | |
239 | } | |
240 | ||
52661efd | 241 | case CONDITION_KERNEL_COMMAND_LINE: |
cb40c15e | 242 | return test_kernel_command_line(c->parameter) == !c->negate; |
52661efd | 243 | |
039655a4 | 244 | case CONDITION_VIRTUALIZATION: |
cb40c15e | 245 | return test_virtualization(c->parameter) == !c->negate; |
039655a4 | 246 | |
07e833bc MS |
247 | case CONDITION_SECURITY: |
248 | return test_security(c->parameter) == !c->negate; | |
249 | ||
62590f23 LP |
250 | case CONDITION_CAPABILITY: |
251 | return test_capability(c->parameter) == !c->negate; | |
252 | ||
d257ddef LP |
253 | case CONDITION_NULL: |
254 | return !c->negate; | |
255 | ||
52661efd LP |
256 | default: |
257 | assert_not_reached("Invalid condition type."); | |
258 | } | |
259 | } | |
260 | ||
261 | bool condition_test_list(Condition *first) { | |
262 | Condition *c; | |
267632f0 | 263 | int triggered = -1; |
52661efd LP |
264 | |
265 | /* If the condition list is empty, then it is true */ | |
266 | if (!first) | |
267 | return true; | |
268 | ||
267632f0 LP |
269 | /* Otherwise, if all of the non-trigger conditions apply and |
270 | * if any of the trigger conditions apply (unless there are | |
271 | * none) we return true */ | |
272 | LIST_FOREACH(conditions, c, first) { | |
273 | bool b; | |
274 | ||
275 | b = condition_test(c); | |
276 | ||
277 | if (!c->trigger && !b) | |
278 | return false; | |
279 | ||
280 | if (c->trigger && triggered <= 0) | |
281 | triggered = b; | |
282 | } | |
52661efd | 283 | |
267632f0 | 284 | return triggered != 0; |
52661efd LP |
285 | } |
286 | ||
287 | void condition_dump(Condition *c, FILE *f, const char *prefix) { | |
288 | assert(c); | |
289 | assert(f); | |
290 | ||
291 | if (!prefix) | |
292 | prefix = ""; | |
293 | ||
294 | fprintf(f, | |
8fb81fa7 | 295 | "%s\t%s: %s%s%s\n", |
52661efd LP |
296 | prefix, |
297 | condition_type_to_string(c->type), | |
267632f0 | 298 | c->trigger ? "|" : "", |
52661efd LP |
299 | c->negate ? "!" : "", |
300 | c->parameter); | |
301 | } | |
302 | ||
303 | void condition_dump_list(Condition *first, FILE *f, const char *prefix) { | |
304 | Condition *c; | |
305 | ||
306 | LIST_FOREACH(conditions, c, first) | |
307 | condition_dump(c, f, prefix); | |
308 | } | |
309 | ||
310 | static const char* const condition_type_table[_CONDITION_TYPE_MAX] = { | |
d257ddef | 311 | [CONDITION_PATH_EXISTS] = "ConditionPathExists", |
8092a428 | 312 | [CONDITION_PATH_EXISTS_GLOB] = "ConditionPathExistsGlob", |
8fb81fa7 | 313 | [CONDITION_PATH_IS_DIRECTORY] = "ConditionPathIsDirectory", |
0d60602c | 314 | [CONDITION_PATH_IS_SYMBOLIC_LINK] = "ConditionPathIsSymbolicLink", |
ab7f148f | 315 | [CONDITION_PATH_IS_MOUNT_POINT] = "ConditionPathIsMountPoint", |
8fb81fa7 MS |
316 | [CONDITION_DIRECTORY_NOT_EMPTY] = "ConditionDirectoryNotEmpty", |
317 | [CONDITION_KERNEL_COMMAND_LINE] = "ConditionKernelCommandLine", | |
318 | [CONDITION_VIRTUALIZATION] = "ConditionVirtualization", | |
07e833bc | 319 | [CONDITION_SECURITY] = "ConditionSecurity", |
d257ddef | 320 | [CONDITION_NULL] = "ConditionNull" |
52661efd LP |
321 | }; |
322 | ||
323 | DEFINE_STRING_TABLE_LOOKUP(condition_type, ConditionType); |