1 |
/* |
2 |
* security/ccsecurity/policy_io.c |
3 |
* |
4 |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
5 |
* |
6 |
* Version: 1.7.0-pre 2009/07/03 |
7 |
* |
8 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
9 |
* See README.ccs for ChangeLog. |
10 |
* |
11 |
*/ |
12 |
|
13 |
#include "internal.h" |
14 |
|
15 |
/* Lock for protecting ccs_profile->comment */ |
16 |
static DEFINE_SPINLOCK(ccs_profile_comment_lock); |
17 |
|
18 |
static bool ccs_profile_entry_used[CCS_MAX_CONTROL_INDEX + |
19 |
CCS_MAX_CAPABILITY_INDEX + 1]; |
20 |
|
21 |
/* String table for functionality that takes 4 modes. */ |
22 |
static const char *ccs_mode_4[4] = { |
23 |
"disabled", "learning", "permissive", "enforcing" |
24 |
}; |
25 |
/* String table for functionality that takes 2 modes. */ |
26 |
static const char *ccs_mode_2[4] = { |
27 |
"disabled", "enabled", "enabled", "enabled" |
28 |
}; |
29 |
|
30 |
/* Table for profile. */ |
31 |
static struct { |
32 |
const char *keyword; |
33 |
unsigned int current_value; |
34 |
const unsigned int max_value; |
35 |
} ccs_control_array[CCS_MAX_CONTROL_INDEX] = { |
36 |
[CCS_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 }, |
37 |
[CCS_MAC_FOR_IOCTL] = { "MAC_FOR_IOCTL", 0, 3 }, |
38 |
[CCS_MAC_FOR_ARGV0] = { "MAC_FOR_ARGV0", 0, 3 }, |
39 |
[CCS_MAC_FOR_ENV] = { "MAC_FOR_ENV", 0, 3 }, |
40 |
[CCS_MAC_FOR_NETWORK] = { "MAC_FOR_NETWORK", 0, 3 }, |
41 |
[CCS_MAC_FOR_SIGNAL] = { "MAC_FOR_SIGNAL", 0, 3 }, |
42 |
[CCS_MAC_FOR_NAMESPACE] = { "MAC_FOR_NAMESPACE", 0, 3 }, |
43 |
[CCS_RESTRICT_AUTOBIND] = { "RESTRICT_AUTOBIND", 0, 1 }, |
44 |
[CCS_MAX_ACCEPT_ENTRY] |
45 |
= { "MAX_ACCEPT_ENTRY", CONFIG_CCSECURITY_MAX_ACCEPT_ENTRY, INT_MAX }, |
46 |
#ifdef CONFIG_CCSECURITY_AUDIT |
47 |
[CCS_MAX_GRANT_LOG] |
48 |
= { "MAX_GRANT_LOG", CONFIG_CCSECURITY_MAX_GRANT_LOG, INT_MAX }, |
49 |
[CCS_MAX_REJECT_LOG] |
50 |
= { "MAX_REJECT_LOG", CONFIG_CCSECURITY_MAX_REJECT_LOG, INT_MAX }, |
51 |
#endif |
52 |
[CCS_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 }, |
53 |
[CCS_SLEEP_PERIOD] |
54 |
= { "SLEEP_PERIOD", 0, 3000 }, /* in 0.1 second */ |
55 |
}; |
56 |
|
57 |
/* Permit policy management by non-root user? */ |
58 |
static bool ccs_manage_by_non_root; |
59 |
|
60 |
/** |
61 |
* ccs_quiet_setup - Set CCS_VERBOSE=0 by default. |
62 |
* |
63 |
* @str: Unused. |
64 |
* |
65 |
* Returns 0. |
66 |
*/ |
67 |
static int __init ccs_quiet_setup(char *str) |
68 |
{ |
69 |
ccs_control_array[CCS_VERBOSE].current_value = 0; |
70 |
return 0; |
71 |
} |
72 |
|
73 |
__setup("CCS_QUIET", ccs_quiet_setup); |
74 |
|
75 |
/** |
76 |
* ccs_io_printf - Transactional printf() to "struct ccs_io_buffer" structure. |
77 |
* |
78 |
* @head: Pointer to "struct ccs_io_buffer". |
79 |
* @fmt: The printf()'s format string, followed by parameters. |
80 |
* |
81 |
* Returns true on success, false otherwise. |
82 |
* |
83 |
* The snprintf() will truncate, but ccs_io_printf() won't. |
84 |
*/ |
85 |
bool ccs_io_printf(struct ccs_io_buffer *head, const char *fmt, ...) |
86 |
{ |
87 |
va_list args; |
88 |
int len; |
89 |
int pos = head->read_avail; |
90 |
int size = head->readbuf_size - pos; |
91 |
if (size <= 0) |
92 |
return false; |
93 |
va_start(args, fmt); |
94 |
len = vsnprintf(head->read_buf + pos, size, fmt, args); |
95 |
va_end(args); |
96 |
if (pos + len >= head->readbuf_size) |
97 |
return false; |
98 |
head->read_avail += len; |
99 |
return true; |
100 |
} |
101 |
|
102 |
/** |
103 |
* ccs_find_or_assign_new_profile - Create a new profile. |
104 |
* |
105 |
* @profile: Profile number to create. |
106 |
* |
107 |
* Returns pointer to "struct ccs_profile" on success, NULL otherwise. |
108 |
*/ |
109 |
struct ccs_profile *ccs_find_or_assign_new_profile(const unsigned int |
110 |
profile) |
111 |
{ |
112 |
struct ccs_profile *ptr; |
113 |
struct ccs_profile *entry; |
114 |
int i; |
115 |
if (profile >= MAX_PROFILES) |
116 |
return NULL; |
117 |
ptr = ccs_profile_ptr[profile]; |
118 |
if (ptr) |
119 |
return ptr; |
120 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
121 |
mutex_lock(&ccs_policy_lock); |
122 |
ptr = ccs_profile_ptr[profile]; |
123 |
if (!ptr && ccs_memory_ok(entry, sizeof(*entry))) { |
124 |
ptr = entry; |
125 |
for (i = 0; i < CCS_MAX_CONTROL_INDEX; i++) |
126 |
ptr->value[i] = ccs_control_array[i].current_value; |
127 |
/* |
128 |
* Needn't to initialize "ptr->capability_value" |
129 |
* because they are always 0. |
130 |
*/ |
131 |
mb(); /* Avoid out-of-order execution. */ |
132 |
ccs_profile_ptr[profile] = ptr; |
133 |
entry = NULL; |
134 |
} |
135 |
mutex_unlock(&ccs_policy_lock); |
136 |
kfree(entry); |
137 |
return ptr; |
138 |
} |
139 |
|
140 |
/** |
141 |
* ccs_write_profile - Write profile table. |
142 |
* |
143 |
* @head: Pointer to "struct ccs_io_buffer". |
144 |
* |
145 |
* Returns 0 on success, negative value otherwise. |
146 |
*/ |
147 |
static int ccs_write_profile(struct ccs_io_buffer *head) |
148 |
{ |
149 |
char *data = head->write_buf; |
150 |
unsigned int i; |
151 |
unsigned int value; |
152 |
char *cp; |
153 |
struct ccs_profile *ccs_profile; |
154 |
i = simple_strtoul(data, &cp, 10); |
155 |
if (data != cp) { |
156 |
if (*cp != '-') |
157 |
return -EINVAL; |
158 |
data = cp + 1; |
159 |
} |
160 |
ccs_profile = ccs_find_or_assign_new_profile(i); |
161 |
if (!ccs_profile) |
162 |
return -EINVAL; |
163 |
cp = strchr(data, '='); |
164 |
if (!cp) |
165 |
return -EINVAL; |
166 |
*cp = '\0'; |
167 |
if (!strcmp(data, "COMMENT")) { |
168 |
const struct ccs_path_info *new_comment |
169 |
= ccs_get_name(cp + 1); |
170 |
const struct ccs_path_info *old_comment; |
171 |
/* Protect reader from ccs_put_name(). */ |
172 |
/***** CRITICAL SECTION START *****/ |
173 |
spin_lock(&ccs_profile_comment_lock); |
174 |
old_comment = ccs_profile->comment; |
175 |
ccs_profile->comment = new_comment; |
176 |
spin_unlock(&ccs_profile_comment_lock); |
177 |
/***** CRITICAL SECTION END *****/ |
178 |
ccs_put_name(old_comment); |
179 |
ccs_profile_entry_used[0] = true; |
180 |
return 0; |
181 |
} |
182 |
if (ccs_str_starts(&data, KEYWORD_MAC_FOR_CAPABILITY)) { |
183 |
if (sscanf(cp + 1, "%u", &value) != 1) { |
184 |
for (i = 0; i < 4; i++) { |
185 |
if (strcmp(cp + 1, ccs_mode_4[i])) |
186 |
continue; |
187 |
value = i; |
188 |
break; |
189 |
} |
190 |
if (i == 4) |
191 |
return -EINVAL; |
192 |
} |
193 |
if (value > 3) |
194 |
value = 3; |
195 |
for (i = 0; i < CCS_MAX_CAPABILITY_INDEX; i++) { |
196 |
if (strcmp(data, ccs_capability_control_keyword[i])) |
197 |
continue; |
198 |
ccs_profile->capability_value[i] = value; |
199 |
ccs_profile_entry_used[i + 1 + CCS_MAX_CONTROL_INDEX] |
200 |
= true; |
201 |
return 0; |
202 |
} |
203 |
return -EINVAL; |
204 |
} |
205 |
for (i = 0; i < CCS_MAX_CONTROL_INDEX; i++) { |
206 |
if (strcmp(data, ccs_control_array[i].keyword)) |
207 |
continue; |
208 |
if (sscanf(cp + 1, "%u", &value) != 1) { |
209 |
int j; |
210 |
const char **modes; |
211 |
switch (i) { |
212 |
case CCS_RESTRICT_AUTOBIND: |
213 |
case CCS_VERBOSE: |
214 |
modes = ccs_mode_2; |
215 |
break; |
216 |
default: |
217 |
modes = ccs_mode_4; |
218 |
break; |
219 |
} |
220 |
for (j = 0; j < 4; j++) { |
221 |
if (strcmp(cp + 1, modes[j])) |
222 |
continue; |
223 |
value = j; |
224 |
break; |
225 |
} |
226 |
if (j == 4) |
227 |
return -EINVAL; |
228 |
} else if (value > ccs_control_array[i].max_value) { |
229 |
value = ccs_control_array[i].max_value; |
230 |
} |
231 |
ccs_profile->value[i] = value; |
232 |
ccs_profile_entry_used[i + 1] = true; |
233 |
return 0; |
234 |
} |
235 |
return -EINVAL; |
236 |
} |
237 |
|
238 |
/** |
239 |
* ccs_read_profile - Read profile table. |
240 |
* |
241 |
* @head: Pointer to "struct ccs_io_buffer". |
242 |
* |
243 |
* Returns 0. |
244 |
*/ |
245 |
static int ccs_read_profile(struct ccs_io_buffer *head) |
246 |
{ |
247 |
static const int ccs_total |
248 |
= CCS_MAX_CONTROL_INDEX + CCS_MAX_CAPABILITY_INDEX + 1; |
249 |
int step; |
250 |
if (head->read_eof) |
251 |
return 0; |
252 |
for (step = head->read_step; step < MAX_PROFILES * ccs_total; step++) { |
253 |
const u8 index = step / ccs_total; |
254 |
u8 type = step % ccs_total; |
255 |
const struct ccs_profile *ccs_profile = ccs_profile_ptr[index]; |
256 |
head->read_step = step; |
257 |
if (!ccs_profile) |
258 |
continue; |
259 |
if (!ccs_profile_entry_used[type]) |
260 |
continue; |
261 |
if (!type) { /* Print profile' comment tag. */ |
262 |
bool done; |
263 |
/***** CRITICAL SECTION START *****/ |
264 |
spin_lock(&ccs_profile_comment_lock); |
265 |
done = ccs_io_printf(head, "%u-COMMENT=%s\n", |
266 |
index, ccs_profile->comment ? |
267 |
ccs_profile->comment->name : ""); |
268 |
spin_unlock(&ccs_profile_comment_lock); |
269 |
/***** CRITICAL SECTION END *****/ |
270 |
if (!done) |
271 |
break; |
272 |
continue; |
273 |
} |
274 |
type--; |
275 |
if (type >= CCS_MAX_CONTROL_INDEX) { |
276 |
const int i = type - CCS_MAX_CONTROL_INDEX; |
277 |
const u8 value = ccs_profile->capability_value[i]; |
278 |
if (!ccs_io_printf(head, |
279 |
"%u-" KEYWORD_MAC_FOR_CAPABILITY |
280 |
"%s=%s\n", index, |
281 |
ccs_capability_control_keyword[i], |
282 |
ccs_mode_4[value])) |
283 |
break; |
284 |
} else { |
285 |
const unsigned int value = ccs_profile->value[type]; |
286 |
const char **modes = NULL; |
287 |
const char *keyword = ccs_control_array[type].keyword; |
288 |
switch (ccs_control_array[type].max_value) { |
289 |
case 3: |
290 |
modes = ccs_mode_4; |
291 |
break; |
292 |
case 1: |
293 |
modes = ccs_mode_2; |
294 |
break; |
295 |
} |
296 |
if (modes) { |
297 |
if (!ccs_io_printf(head, "%u-%s=%s\n", index, |
298 |
keyword, modes[value])) |
299 |
break; |
300 |
} else { |
301 |
if (!ccs_io_printf(head, "%u-%s=%u\n", index, |
302 |
keyword, value)) |
303 |
break; |
304 |
} |
305 |
} |
306 |
} |
307 |
if (step == MAX_PROFILES * ccs_total) |
308 |
head->read_eof = true; |
309 |
return 0; |
310 |
} |
311 |
|
312 |
/* The list for "struct ccs_policy_manager_entry". */ |
313 |
LIST_HEAD(ccs_policy_manager_list); |
314 |
|
315 |
/** |
316 |
* ccs_update_manager_entry - Add a manager entry. |
317 |
* |
318 |
* @manager: The path to manager or the domainnamme. |
319 |
* @is_delete: True if it is a delete request. |
320 |
* |
321 |
* Returns 0 on success, negative value otherwise. |
322 |
*/ |
323 |
static int ccs_update_manager_entry(const char *manager, const bool is_delete) |
324 |
{ |
325 |
struct ccs_policy_manager_entry *entry = NULL; |
326 |
struct ccs_policy_manager_entry *ptr; |
327 |
const struct ccs_path_info *saved_manager; |
328 |
int error = is_delete ? -ENOENT : -ENOMEM; |
329 |
bool is_domain = false; |
330 |
if (ccs_is_domain_def(manager)) { |
331 |
if (!ccs_is_correct_domain(manager)) |
332 |
return -EINVAL; |
333 |
is_domain = true; |
334 |
} else { |
335 |
if (!ccs_is_correct_path(manager, 1, -1, -1)) |
336 |
return -EINVAL; |
337 |
} |
338 |
saved_manager = ccs_get_name(manager); |
339 |
if (!saved_manager) |
340 |
return -ENOMEM; |
341 |
if (!is_delete) |
342 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
343 |
mutex_lock(&ccs_policy_lock); |
344 |
list_for_each_entry_rcu(ptr, &ccs_policy_manager_list, list) { |
345 |
if (ptr->manager != saved_manager) |
346 |
continue; |
347 |
ptr->is_deleted = is_delete; |
348 |
error = 0; |
349 |
break; |
350 |
} |
351 |
if (!is_delete && error && ccs_memory_ok(entry, sizeof(*entry))) { |
352 |
entry->manager = saved_manager; |
353 |
saved_manager = NULL; |
354 |
entry->is_domain = is_domain; |
355 |
list_add_tail_rcu(&entry->list, &ccs_policy_manager_list); |
356 |
entry = NULL; |
357 |
error = 0; |
358 |
} |
359 |
mutex_unlock(&ccs_policy_lock); |
360 |
ccs_put_name(saved_manager); |
361 |
kfree(entry); |
362 |
return error; |
363 |
} |
364 |
|
365 |
/** |
366 |
* ccs_write_manager_policy - Write manager policy. |
367 |
* |
368 |
* @head: Pointer to "struct ccs_io_buffer". |
369 |
* |
370 |
* Returns 0 on success, negative value otherwise. |
371 |
*/ |
372 |
static int ccs_write_manager_policy(struct ccs_io_buffer *head) |
373 |
{ |
374 |
char *data = head->write_buf; |
375 |
bool is_delete = ccs_str_starts(&data, KEYWORD_DELETE); |
376 |
if (!strcmp(data, "manage_by_non_root")) { |
377 |
ccs_manage_by_non_root = !is_delete; |
378 |
return 0; |
379 |
} |
380 |
return ccs_update_manager_entry(data, is_delete); |
381 |
} |
382 |
|
383 |
/** |
384 |
* ccs_read_manager_policy - Read manager policy. |
385 |
* |
386 |
* @head: Pointer to "struct ccs_io_buffer". |
387 |
* |
388 |
* Returns 0. |
389 |
* |
390 |
* Caller holds ccs_read_lock(). |
391 |
*/ |
392 |
static int ccs_read_manager_policy(struct ccs_io_buffer *head) |
393 |
{ |
394 |
struct list_head *pos; |
395 |
ccs_check_read_lock(); |
396 |
if (head->read_eof) |
397 |
return 0; |
398 |
list_for_each_cookie(pos, head->read_var2, &ccs_policy_manager_list) { |
399 |
struct ccs_policy_manager_entry *ptr; |
400 |
ptr = list_entry(pos, struct ccs_policy_manager_entry, list); |
401 |
if (ptr->is_deleted) |
402 |
continue; |
403 |
if (!ccs_io_printf(head, "%s\n", ptr->manager->name)) |
404 |
return 0; |
405 |
} |
406 |
head->read_eof = true; |
407 |
return 0; |
408 |
} |
409 |
|
410 |
/** |
411 |
* ccs_is_policy_manager - Check whether the current process is a policy manager. |
412 |
* |
413 |
* Returns true if the current process is permitted to modify policy |
414 |
* via /proc/ccs/ interface. |
415 |
* |
416 |
* Caller holds ccs_read_lock(). |
417 |
*/ |
418 |
static bool ccs_is_policy_manager(void) |
419 |
{ |
420 |
struct ccs_policy_manager_entry *ptr; |
421 |
const char *exe; |
422 |
struct task_struct *task = current; |
423 |
const struct ccs_path_info *domainname |
424 |
= ccs_current_domain()->domainname; |
425 |
bool found = false; |
426 |
ccs_check_read_lock(); |
427 |
if (!ccs_policy_loaded) |
428 |
return true; |
429 |
if (task->ccs_flags & CCS_TASK_IS_POLICY_MANAGER) |
430 |
return true; |
431 |
if (!ccs_manage_by_non_root && (current_uid() || current_euid())) |
432 |
return false; |
433 |
list_for_each_entry_rcu(ptr, &ccs_policy_manager_list, list) { |
434 |
if (!ptr->is_deleted && ptr->is_domain |
435 |
&& !ccs_pathcmp(domainname, ptr->manager)) { |
436 |
/* Set manager flag. */ |
437 |
task->ccs_flags |= CCS_TASK_IS_POLICY_MANAGER; |
438 |
return true; |
439 |
} |
440 |
} |
441 |
exe = ccs_get_exe(); |
442 |
if (!exe) |
443 |
return false; |
444 |
list_for_each_entry_rcu(ptr, &ccs_policy_manager_list, list) { |
445 |
if (!ptr->is_deleted && !ptr->is_domain |
446 |
&& !strcmp(exe, ptr->manager->name)) { |
447 |
found = true; |
448 |
/* Set manager flag. */ |
449 |
task->ccs_flags |= CCS_TASK_IS_POLICY_MANAGER; |
450 |
break; |
451 |
} |
452 |
} |
453 |
if (!found) { /* Reduce error messages. */ |
454 |
static pid_t ccs_last_pid; |
455 |
const pid_t pid = current->pid; |
456 |
if (ccs_last_pid != pid) { |
457 |
printk(KERN_WARNING "%s ( %s ) is not permitted to " |
458 |
"update policies.\n", domainname->name, exe); |
459 |
ccs_last_pid = pid; |
460 |
} |
461 |
} |
462 |
kfree(exe); |
463 |
return found; |
464 |
} |
465 |
|
466 |
/** |
467 |
* ccs_find_condition_part - Find condition part from the statement. |
468 |
* |
469 |
* @data: String to parse. |
470 |
* |
471 |
* Returns pointer to the condition part if it was found in the statement, |
472 |
* NULL otherwise. |
473 |
*/ |
474 |
static char *ccs_find_condition_part(char *data) |
475 |
{ |
476 |
char *cp = strstr(data, " if "); |
477 |
if (cp) { |
478 |
while (1) { |
479 |
char *cp2 = strstr(cp + 3, " if "); |
480 |
if (!cp2) |
481 |
break; |
482 |
cp = cp2; |
483 |
} |
484 |
*cp++ = '\0'; |
485 |
} else { |
486 |
cp = strstr(data, " ; set "); |
487 |
if (cp) |
488 |
*cp++ = '\0'; |
489 |
} |
490 |
return cp; |
491 |
} |
492 |
|
493 |
/** |
494 |
* ccs_is_select_one - Parse select command. |
495 |
* |
496 |
* @head: Pointer to "struct ccs_io_buffer". |
497 |
* @data: String to parse. |
498 |
* |
499 |
* Returns true on success, false otherwise. |
500 |
* |
501 |
* Caller holds ccs_read_lock(). |
502 |
*/ |
503 |
static bool ccs_is_select_one(struct ccs_io_buffer *head, const char *data) |
504 |
{ |
505 |
unsigned int pid; |
506 |
struct ccs_domain_info *domain = NULL; |
507 |
ccs_check_read_lock(); |
508 |
if (!strcmp(data, "allow_execute")) { |
509 |
head->read_execute_only = true; |
510 |
return true; |
511 |
} |
512 |
if (sscanf(data, "pid=%u", &pid) == 1) { |
513 |
struct task_struct *p; |
514 |
/***** CRITICAL SECTION START *****/ |
515 |
read_lock(&tasklist_lock); |
516 |
p = find_task_by_pid(pid); |
517 |
if (p) |
518 |
domain = ccs_task_domain(p); |
519 |
read_unlock(&tasklist_lock); |
520 |
/***** CRITICAL SECTION END *****/ |
521 |
} else if (!strncmp(data, "domain=", 7)) { |
522 |
if (ccs_is_domain_def(data + 7)) |
523 |
domain = ccs_find_domain(data + 7); |
524 |
} else |
525 |
return false; |
526 |
head->write_var1 = domain; |
527 |
/* Accessing read_buf is safe because head->io_sem is held. */ |
528 |
if (!head->read_buf) |
529 |
return true; /* Do nothing if open(O_WRONLY). */ |
530 |
head->read_avail = 0; |
531 |
ccs_io_printf(head, "# select %s\n", data); |
532 |
head->read_single_domain = true; |
533 |
head->read_eof = !domain; |
534 |
if (domain) { |
535 |
struct ccs_domain_info *d; |
536 |
head->read_var1 = NULL; |
537 |
list_for_each_entry_rcu(d, &ccs_domain_list, list) { |
538 |
if (d == domain) |
539 |
break; |
540 |
head->read_var1 = &d->list; |
541 |
} |
542 |
head->read_var2 = NULL; |
543 |
head->read_bit = 0; |
544 |
head->read_step = 0; |
545 |
if (domain->is_deleted) |
546 |
ccs_io_printf(head, "# This is a deleted domain.\n"); |
547 |
} |
548 |
return true; |
549 |
} |
550 |
|
551 |
/** |
552 |
* ccs_write_domain_policy - Write domain policy. |
553 |
* |
554 |
* @head: Pointer to "struct ccs_io_buffer". |
555 |
* |
556 |
* Returns 0 on success, negative value otherwise. |
557 |
*/ |
558 |
static int ccs_write_domain_policy(struct ccs_io_buffer *head) |
559 |
{ |
560 |
char *data = head->write_buf; |
561 |
struct ccs_domain_info *domain = head->write_var1; |
562 |
bool is_delete = false; |
563 |
bool is_select = false; |
564 |
unsigned int profile; |
565 |
struct ccs_condition *cond = NULL; |
566 |
char *cp; |
567 |
int error; |
568 |
if (ccs_str_starts(&data, KEYWORD_DELETE)) |
569 |
is_delete = true; |
570 |
else if (ccs_str_starts(&data, KEYWORD_SELECT)) |
571 |
is_select = true; |
572 |
if (is_select && ccs_is_select_one(head, data)) |
573 |
return 0; |
574 |
/* Don't allow updating policies by non manager programs. */ |
575 |
if (!ccs_is_policy_manager()) |
576 |
return -EPERM; |
577 |
if (ccs_is_domain_def(data)) { |
578 |
domain = NULL; |
579 |
if (is_delete) |
580 |
ccs_delete_domain(data); |
581 |
else if (is_select) |
582 |
domain = ccs_find_domain(data); |
583 |
else |
584 |
domain = ccs_find_or_assign_new_domain(data, 0); |
585 |
head->write_var1 = domain; |
586 |
return 0; |
587 |
} |
588 |
if (!domain) |
589 |
return -EINVAL; |
590 |
|
591 |
if (sscanf(data, KEYWORD_USE_PROFILE "%u", &profile) == 1 |
592 |
&& profile < MAX_PROFILES) { |
593 |
if (ccs_profile_ptr[profile] || !ccs_policy_loaded) |
594 |
domain->profile = (u8) profile; |
595 |
return 0; |
596 |
} |
597 |
if (!strcmp(data, KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { |
598 |
domain->ignore_global_allow_read = !is_delete; |
599 |
return 0; |
600 |
} |
601 |
if (!strcmp(data, KEYWORD_IGNORE_GLOBAL_ALLOW_ENV)) { |
602 |
domain->ignore_global_allow_env = !is_delete; |
603 |
return 0; |
604 |
} |
605 |
cp = ccs_find_condition_part(data); |
606 |
if (cp) { |
607 |
cond = ccs_get_condition(cp); |
608 |
if (!cond) |
609 |
return -EINVAL; |
610 |
} |
611 |
if (ccs_str_starts(&data, KEYWORD_ALLOW_CAPABILITY)) |
612 |
error = ccs_write_capability_policy(data, domain, cond, |
613 |
is_delete); |
614 |
else if (ccs_str_starts(&data, KEYWORD_ALLOW_NETWORK)) |
615 |
error = ccs_write_network_policy(data, domain, cond, is_delete); |
616 |
else if (ccs_str_starts(&data, KEYWORD_ALLOW_SIGNAL)) |
617 |
error = ccs_write_signal_policy(data, domain, cond, is_delete); |
618 |
else if (ccs_str_starts(&data, KEYWORD_ALLOW_ARGV0)) |
619 |
error = ccs_write_argv0_policy(data, domain, cond, is_delete); |
620 |
else if (ccs_str_starts(&data, KEYWORD_ALLOW_ENV)) |
621 |
error = ccs_write_env_policy(data, domain, cond, is_delete); |
622 |
else if (ccs_str_starts(&data, KEYWORD_ALLOW_IOCTL)) |
623 |
error = ccs_write_ioctl_policy(data, domain, cond, is_delete); |
624 |
else if (ccs_str_starts(&data, KEYWORD_ALLOW_MOUNT)) |
625 |
error = ccs_write_mount_policy(data, domain, cond, is_delete); |
626 |
else if (ccs_str_starts(&data, KEYWORD_ALLOW_UNMOUNT)) |
627 |
error = ccs_write_umount_policy(data, domain, cond, is_delete); |
628 |
else if (ccs_str_starts(&data, KEYWORD_ALLOW_CHROOT)) |
629 |
error = ccs_write_chroot_policy(data, domain, cond, is_delete); |
630 |
else if (ccs_str_starts(&data, KEYWORD_ALLOW_PIVOT_ROOT)) |
631 |
error = ccs_write_pivot_root_policy(data, domain, cond, |
632 |
is_delete); |
633 |
else |
634 |
error = ccs_write_file_policy(data, domain, cond, is_delete); |
635 |
if (cond) |
636 |
ccs_put_condition(cond); |
637 |
return error; |
638 |
} |
639 |
|
640 |
static bool ccs_print_name_union(struct ccs_io_buffer *head, bool is_group, |
641 |
union ccs_name_union *group) |
642 |
{ |
643 |
const int pos = head->read_avail; |
644 |
if (pos && head->read_buf[pos - 1] == ' ') |
645 |
head->read_avail--; |
646 |
if (is_group) |
647 |
return ccs_io_printf(head, " @%s", group->group->group_name->name); |
648 |
return ccs_io_printf(head, " %s", group->filename->name); |
649 |
} |
650 |
|
651 |
static bool ccs_print_number_union(struct ccs_io_buffer *head, bool is_group, |
652 |
union ccs_number_union *group) |
653 |
{ |
654 |
unsigned int min; |
655 |
unsigned int max; |
656 |
if (is_group) |
657 |
return ccs_io_printf(head, " @%s", group->group->group_name->name); |
658 |
min = group->value.min; |
659 |
max = group->value.max; |
660 |
if (min == max) |
661 |
return ccs_io_printf(head, " %u", min); |
662 |
return ccs_io_printf(head, " %u-%u", min, max); |
663 |
} |
664 |
|
665 |
/** |
666 |
* ccs_print_single_path_acl - Print a single path ACL entry. |
667 |
* |
668 |
* @head: Pointer to "struct ccs_io_buffer". |
669 |
* @ptr: Pointer to "struct ccs_single_path_acl_record". |
670 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
671 |
* |
672 |
* Returns true on success, false otherwise. |
673 |
*/ |
674 |
static bool ccs_print_single_path_acl(struct ccs_io_buffer *head, |
675 |
struct ccs_single_path_acl_record *ptr, |
676 |
const struct ccs_condition *cond) |
677 |
{ |
678 |
int pos; |
679 |
u8 bit; |
680 |
const u16 perm = ptr->perm; |
681 |
for (bit = head->read_bit; bit < MAX_SINGLE_PATH_OPERATION; bit++) { |
682 |
const char *msg; |
683 |
if (!(perm & (1 << bit))) |
684 |
continue; |
685 |
if (head->read_execute_only && bit != TYPE_EXECUTE_ACL) |
686 |
continue; |
687 |
/* Print "read/write" instead of "read" and "write". */ |
688 |
if ((bit == TYPE_READ_ACL || bit == TYPE_WRITE_ACL) |
689 |
&& (perm & (1 << TYPE_READ_WRITE_ACL))) |
690 |
continue; |
691 |
msg = ccs_sp2keyword(bit); |
692 |
pos = head->read_avail; |
693 |
if (!ccs_io_printf(head, "allow_%s", msg) || |
694 |
!ccs_print_name_union(head, ptr->name_is_group, |
695 |
&ptr->name) || |
696 |
!ccs_print_condition(head, cond)) |
697 |
goto out; |
698 |
} |
699 |
head->read_bit = 0; |
700 |
return true; |
701 |
out: |
702 |
head->read_bit = bit; |
703 |
head->read_avail = pos; |
704 |
return false; |
705 |
} |
706 |
|
707 |
/** |
708 |
* ccs_print_mkdev_acl - Print a mkdev ACL entry. |
709 |
* |
710 |
* @head: Pointer to "struct ccs_io_buffer". |
711 |
* @ptr: Pointer to "struct ccs_mkdev_acl_record". |
712 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
713 |
* |
714 |
* Returns true on success, false otherwise. |
715 |
*/ |
716 |
static bool ccs_print_mkdev_acl(struct ccs_io_buffer *head, |
717 |
struct ccs_mkdev_acl_record *ptr, |
718 |
const struct ccs_condition *cond) |
719 |
{ |
720 |
int pos; |
721 |
u8 bit; |
722 |
const u16 perm = ptr->perm; |
723 |
for (bit = head->read_bit; bit < MAX_MKDEV_OPERATION; bit++) { |
724 |
const char *msg; |
725 |
if (!(perm & (1 << bit))) |
726 |
continue; |
727 |
msg = ccs_mkdev2keyword(bit); |
728 |
pos = head->read_avail; |
729 |
if (!ccs_io_printf(head, "allow_%s", msg) || |
730 |
!ccs_print_name_union(head, ptr->name_is_group, |
731 |
&ptr->name) || |
732 |
!ccs_print_number_union(head, ptr->major_is_group, |
733 |
&ptr->major) || |
734 |
!ccs_print_number_union(head, ptr->minor_is_group, |
735 |
&ptr->minor) || |
736 |
!ccs_print_condition(head, cond)) |
737 |
goto out; |
738 |
} |
739 |
head->read_bit = 0; |
740 |
return true; |
741 |
out: |
742 |
head->read_bit = bit; |
743 |
head->read_avail = pos; |
744 |
return false; |
745 |
} |
746 |
|
747 |
/** |
748 |
* ccs_print_double_path_acl - Print a double path ACL entry. |
749 |
* |
750 |
* @head: Pointer to "struct ccs_io_buffer". |
751 |
* @ptr: Pointer to "struct ccs_double_path_acl_record". |
752 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
753 |
* |
754 |
* Returns true on success, false otherwise. |
755 |
*/ |
756 |
static bool ccs_print_double_path_acl(struct ccs_io_buffer *head, |
757 |
struct ccs_double_path_acl_record *ptr, |
758 |
const struct ccs_condition *cond) |
759 |
{ |
760 |
int pos; |
761 |
u8 bit; |
762 |
const u8 perm = ptr->perm; |
763 |
for (bit = head->read_bit; bit < MAX_DOUBLE_PATH_OPERATION; bit++) { |
764 |
const char *msg; |
765 |
if (!(perm & (1 << bit))) |
766 |
continue; |
767 |
msg = ccs_dp2keyword(bit); |
768 |
pos = head->read_avail; |
769 |
if (!ccs_io_printf(head, "allow_%s", msg) || |
770 |
!ccs_print_name_union(head, ptr->name1_is_group, |
771 |
&ptr->name1) || |
772 |
!ccs_print_name_union(head, ptr->name2_is_group, |
773 |
&ptr->name2) || |
774 |
!ccs_print_condition(head, cond)) |
775 |
goto out; |
776 |
} |
777 |
head->read_bit = 0; |
778 |
return true; |
779 |
out: |
780 |
head->read_bit = bit; |
781 |
head->read_avail = pos; |
782 |
return false; |
783 |
} |
784 |
|
785 |
/** |
786 |
* ccs_print_ioctl_acl - Print an ioctl ACL entry. |
787 |
* |
788 |
* @head: Pointer to "struct ccs_io_buffer". |
789 |
* @ptr: Pointer to "struct ccs_ioctl_acl_record". |
790 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
791 |
* |
792 |
* Returns true on success, false otherwise. |
793 |
*/ |
794 |
static bool ccs_print_ioctl_acl(struct ccs_io_buffer *head, |
795 |
struct ccs_ioctl_acl_record *ptr, |
796 |
const struct ccs_condition *cond) |
797 |
{ |
798 |
int pos = head->read_avail; |
799 |
if (!ccs_io_printf(head, KEYWORD_ALLOW_IOCTL) || |
800 |
!ccs_print_name_union(head, ptr->name_is_group, &ptr->name) || |
801 |
!ccs_print_number_union(head, ptr->cmd_is_group, &ptr->cmd) || |
802 |
!ccs_print_condition(head, cond)) |
803 |
goto out; |
804 |
return true; |
805 |
out: |
806 |
head->read_avail = pos; |
807 |
return false; |
808 |
} |
809 |
|
810 |
/** |
811 |
* ccs_print_argv0_acl - Print an argv[0] ACL entry. |
812 |
* |
813 |
* @head: Pointer to "struct ccs_io_buffer". |
814 |
* @ptr: Pointer to "struct ccs_argv0_acl_record". |
815 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
816 |
* |
817 |
* Returns true on success, false otherwise. |
818 |
*/ |
819 |
static bool ccs_print_argv0_acl(struct ccs_io_buffer *head, |
820 |
struct ccs_argv0_acl_record *ptr, |
821 |
const struct ccs_condition *cond) |
822 |
{ |
823 |
int pos = head->read_avail; |
824 |
if (!ccs_io_printf(head, KEYWORD_ALLOW_ARGV0 "%s %s", |
825 |
ptr->filename->name, ptr->argv0->name)) |
826 |
goto out; |
827 |
if (!ccs_print_condition(head, cond)) |
828 |
goto out; |
829 |
return true; |
830 |
out: |
831 |
head->read_avail = pos; |
832 |
return false; |
833 |
} |
834 |
|
835 |
/** |
836 |
* ccs_print_env_acl - Print an evironment variable name's ACL entry. |
837 |
* |
838 |
* @head: Pointer to "struct ccs_io_buffer". |
839 |
* @ptr: Pointer to "struct ccs_env_acl_record". |
840 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
841 |
* |
842 |
* Returns true on success, false otherwise. |
843 |
*/ |
844 |
static bool ccs_print_env_acl(struct ccs_io_buffer *head, |
845 |
struct ccs_env_acl_record *ptr, |
846 |
const struct ccs_condition *cond) |
847 |
{ |
848 |
int pos = head->read_avail; |
849 |
if (!ccs_io_printf(head, KEYWORD_ALLOW_ENV "%s", ptr->env->name)) |
850 |
goto out; |
851 |
if (!ccs_print_condition(head, cond)) |
852 |
goto out; |
853 |
return true; |
854 |
out: |
855 |
head->read_avail = pos; |
856 |
return false; |
857 |
} |
858 |
|
859 |
/** |
860 |
* ccs_print_capability_acl - Print a capability ACL entry. |
861 |
* |
862 |
* @head: Pointer to "struct ccs_io_buffer". |
863 |
* @ptr: Pointer to "struct ccs_capability_acl_record". |
864 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
865 |
* |
866 |
* Returns true on success, false otherwise. |
867 |
*/ |
868 |
static bool ccs_print_capability_acl(struct ccs_io_buffer *head, |
869 |
struct ccs_capability_acl_record *ptr, |
870 |
const struct ccs_condition *cond) |
871 |
{ |
872 |
int pos = head->read_avail; |
873 |
if (!ccs_io_printf(head, KEYWORD_ALLOW_CAPABILITY "%s", |
874 |
ccs_cap2keyword(ptr->operation))) |
875 |
goto out; |
876 |
if (!ccs_print_condition(head, cond)) |
877 |
goto out; |
878 |
return true; |
879 |
out: |
880 |
head->read_avail = pos; |
881 |
return false; |
882 |
} |
883 |
|
884 |
/** |
885 |
* ccs_print_ipv4_entry - Print IPv4 address of a network ACL entry. |
886 |
* |
887 |
* @head: Pointer to "struct ccs_io_buffer". |
888 |
* @ptr: Pointer to "struct ccs_ip_network_acl_record". |
889 |
* |
890 |
* Returns true on success, false otherwise. |
891 |
*/ |
892 |
static bool ccs_print_ipv4_entry(struct ccs_io_buffer *head, |
893 |
struct ccs_ip_network_acl_record *ptr) |
894 |
{ |
895 |
const u32 min_address = ptr->address.ipv4.min; |
896 |
const u32 max_address = ptr->address.ipv4.max; |
897 |
if (!ccs_io_printf(head, "%u.%u.%u.%u", HIPQUAD(min_address))) |
898 |
return false; |
899 |
if (min_address != max_address |
900 |
&& !ccs_io_printf(head, "-%u.%u.%u.%u", HIPQUAD(max_address))) |
901 |
return false; |
902 |
return true; |
903 |
} |
904 |
|
905 |
/** |
906 |
* ccs_print_ipv6_entry - Print IPv6 address of a network ACL entry. |
907 |
* |
908 |
* @head: Pointer to "struct ccs_io_buffer". |
909 |
* @ptr: Pointer to "struct ccs_ip_network_acl_record". |
910 |
* |
911 |
* Returns true on success, false otherwise. |
912 |
*/ |
913 |
static bool ccs_print_ipv6_entry(struct ccs_io_buffer *head, |
914 |
struct ccs_ip_network_acl_record *ptr) |
915 |
{ |
916 |
char buf[64]; |
917 |
const struct in6_addr *min_address = ptr->address.ipv6.min; |
918 |
const struct in6_addr *max_address = ptr->address.ipv6.max; |
919 |
ccs_print_ipv6(buf, sizeof(buf), min_address); |
920 |
if (!ccs_io_printf(head, "%s", buf)) |
921 |
return false; |
922 |
if (min_address != max_address) { |
923 |
ccs_print_ipv6(buf, sizeof(buf), max_address); |
924 |
if (!ccs_io_printf(head, "-%s", buf)) |
925 |
return false; |
926 |
} |
927 |
return true; |
928 |
} |
929 |
|
930 |
/** |
931 |
* ccs_print_network_acl - Print a network ACL entry. |
932 |
* |
933 |
* @head: Pointer to "struct ccs_io_buffer". |
934 |
* @ptr: Pointer to "struct ccs_ip_network_acl_record". |
935 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
936 |
* |
937 |
* Returns true on success, false otherwise. |
938 |
*/ |
939 |
static bool ccs_print_network_acl(struct ccs_io_buffer *head, |
940 |
struct ccs_ip_network_acl_record *ptr, |
941 |
const struct ccs_condition *cond) |
942 |
{ |
943 |
int pos = head->read_avail; |
944 |
if (!ccs_io_printf(head, KEYWORD_ALLOW_NETWORK "%s ", |
945 |
ccs_net2keyword(ptr->operation_type))) |
946 |
goto out; |
947 |
switch (ptr->record_type) { |
948 |
case IP_RECORD_TYPE_ADDRESS_GROUP: |
949 |
if (!ccs_io_printf(head, "@%s", |
950 |
ptr->address.group->group_name->name)) |
951 |
goto out; |
952 |
break; |
953 |
case IP_RECORD_TYPE_IPv4: |
954 |
if (!ccs_print_ipv4_entry(head, ptr)) |
955 |
goto out; |
956 |
break; |
957 |
case IP_RECORD_TYPE_IPv6: |
958 |
if (!ccs_print_ipv6_entry(head, ptr)) |
959 |
goto out; |
960 |
break; |
961 |
} |
962 |
if (!ccs_print_number_union(head, ptr->port_is_group, &ptr->port) || |
963 |
!ccs_print_condition(head, cond)) |
964 |
goto out; |
965 |
return true; |
966 |
out: |
967 |
head->read_avail = pos; |
968 |
return false; |
969 |
} |
970 |
|
971 |
/** |
972 |
* ccs_print_signal_acl - Print a signal ACL entry. |
973 |
* |
974 |
* @head: Pointer to "struct ccs_io_buffer". |
975 |
* @ptr: Pointer to "struct signale_acl_record". |
976 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
977 |
* |
978 |
* Returns true on success, false otherwise. |
979 |
*/ |
980 |
static bool ccs_print_signal_acl(struct ccs_io_buffer *head, |
981 |
struct ccs_signal_acl_record *ptr, |
982 |
const struct ccs_condition *cond) |
983 |
{ |
984 |
int pos = head->read_avail; |
985 |
if (!ccs_io_printf(head, KEYWORD_ALLOW_SIGNAL "%u %s", |
986 |
ptr->sig, ptr->domainname->name)) |
987 |
goto out; |
988 |
if (!ccs_print_condition(head, cond)) |
989 |
goto out; |
990 |
return true; |
991 |
out: |
992 |
head->read_avail = pos; |
993 |
return false; |
994 |
} |
995 |
|
996 |
/** |
997 |
* ccs_print_execute_handler_record - Print an execute handler ACL entry. |
998 |
* |
999 |
* @head: Pointer to "struct ccs_io_buffer". |
1000 |
* @keyword: Name of the keyword. |
1001 |
* @ptr: Pointer to "struct ccs_execute_handler_record". |
1002 |
* |
1003 |
* Returns true on success, false otherwise. |
1004 |
*/ |
1005 |
static bool ccs_print_execute_handler_record(struct ccs_io_buffer *head, |
1006 |
const char *keyword, |
1007 |
struct ccs_execute_handler_record * |
1008 |
ptr) |
1009 |
{ |
1010 |
return ccs_io_printf(head, "%s %s\n", keyword, ptr->handler->name); |
1011 |
} |
1012 |
|
1013 |
/** |
1014 |
* ccs_print_mount_acl - Print a mount ACL entry. |
1015 |
* |
1016 |
* @head: Pointer to "struct ccs_io_buffer". |
1017 |
* @ptr: Pointer to "struct ccs_mount_acl_record". |
1018 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
1019 |
* |
1020 |
* Returns true on success, false otherwise. |
1021 |
*/ |
1022 |
static bool ccs_print_mount_acl(struct ccs_io_buffer *head, |
1023 |
struct ccs_mount_acl_record *ptr, |
1024 |
const struct ccs_condition *cond) |
1025 |
{ |
1026 |
int pos = head->read_avail; |
1027 |
if (!ccs_io_printf(head, KEYWORD_ALLOW_MOUNT "%s %s %s 0x%lX\n", |
1028 |
ptr->dev_name->name, ptr->dir_name->name, |
1029 |
ptr->fs_type->name, ptr->flags)) |
1030 |
goto out; |
1031 |
if (!ccs_print_condition(head, cond)) |
1032 |
goto out; |
1033 |
return true; |
1034 |
out: |
1035 |
head->read_avail = pos; |
1036 |
return false; |
1037 |
} |
1038 |
|
1039 |
/** |
1040 |
* ccs_print_umount_acl - Print a mount ACL entry. |
1041 |
* |
1042 |
* @head: Pointer to "struct ccs_io_buffer". |
1043 |
* @ptr: Pointer to "struct ccs_umount_acl_record". |
1044 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
1045 |
* |
1046 |
* Returns true on success, false otherwise. |
1047 |
*/ |
1048 |
static bool ccs_print_umount_acl(struct ccs_io_buffer *head, |
1049 |
struct ccs_umount_acl_record *ptr, |
1050 |
const struct ccs_condition *cond) |
1051 |
{ |
1052 |
int pos = head->read_avail; |
1053 |
if (!ccs_io_printf(head, KEYWORD_ALLOW_UNMOUNT "%s\n", |
1054 |
ptr->dir->name)) |
1055 |
goto out; |
1056 |
if (!ccs_print_condition(head, cond)) |
1057 |
goto out; |
1058 |
return true; |
1059 |
out: |
1060 |
head->read_avail = pos; |
1061 |
return false; |
1062 |
} |
1063 |
|
1064 |
/** |
1065 |
* ccs_print_chroot_acl - Print a chroot ACL entry. |
1066 |
* |
1067 |
* @head: Pointer to "struct ccs_io_buffer". |
1068 |
* @ptr: Pointer to "struct ccs_chroot_acl_record". |
1069 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
1070 |
* |
1071 |
* Returns true on success, false otherwise. |
1072 |
*/ |
1073 |
static bool ccs_print_chroot_acl(struct ccs_io_buffer *head, |
1074 |
struct ccs_chroot_acl_record *ptr, |
1075 |
const struct ccs_condition *cond) |
1076 |
{ |
1077 |
int pos = head->read_avail; |
1078 |
if (!ccs_io_printf(head, KEYWORD_ALLOW_CHROOT "%s\n", |
1079 |
ptr->dir->name)) |
1080 |
goto out; |
1081 |
if (!ccs_print_condition(head, cond)) |
1082 |
goto out; |
1083 |
return true; |
1084 |
out: |
1085 |
head->read_avail = pos; |
1086 |
return false; |
1087 |
} |
1088 |
|
1089 |
/** |
1090 |
* ccs_print_pivot_root_acl - Print a pivot_root ACL entry. |
1091 |
* |
1092 |
* @head: Pointer to "struct ccs_io_buffer". |
1093 |
* @ptr: Pointer to "struct ccs_pivot_root_acl_record". |
1094 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
1095 |
* |
1096 |
* Returns true on success, false otherwise. |
1097 |
*/ |
1098 |
static bool ccs_print_pivot_root_acl(struct ccs_io_buffer *head, |
1099 |
struct ccs_pivot_root_acl_record *ptr, |
1100 |
const struct ccs_condition *cond) |
1101 |
{ |
1102 |
int pos = head->read_avail; |
1103 |
if (!ccs_io_printf(head, KEYWORD_ALLOW_PIVOT_ROOT "%s %s\n", |
1104 |
ptr->new_root->name, ptr->old_root->name)) |
1105 |
goto out; |
1106 |
if (!ccs_print_condition(head, cond)) |
1107 |
goto out; |
1108 |
return true; |
1109 |
out: |
1110 |
head->read_avail = pos; |
1111 |
return false; |
1112 |
} |
1113 |
|
1114 |
/** |
1115 |
* ccs_print_entry - Print an ACL entry. |
1116 |
* |
1117 |
* @head: Pointer to "struct ccs_io_buffer". |
1118 |
* @ptr: Pointer to an ACL entry. |
1119 |
* |
1120 |
* Returns true on success, false otherwise. |
1121 |
*/ |
1122 |
static bool ccs_print_entry(struct ccs_io_buffer *head, |
1123 |
struct ccs_acl_info *ptr) |
1124 |
{ |
1125 |
const struct ccs_condition *cond = ptr->cond; |
1126 |
const u8 acl_type = ccs_acl_type2(ptr); |
1127 |
if (acl_type & ACL_DELETED) |
1128 |
return true; |
1129 |
if (acl_type == TYPE_SINGLE_PATH_ACL) { |
1130 |
struct ccs_single_path_acl_record *acl |
1131 |
= container_of(ptr, struct ccs_single_path_acl_record, |
1132 |
head); |
1133 |
return ccs_print_single_path_acl(head, acl, cond); |
1134 |
} |
1135 |
if (acl_type == TYPE_EXECUTE_HANDLER) { |
1136 |
struct ccs_execute_handler_record *acl |
1137 |
= container_of(ptr, struct ccs_execute_handler_record, |
1138 |
head); |
1139 |
const char *keyword = KEYWORD_EXECUTE_HANDLER; |
1140 |
return ccs_print_execute_handler_record(head, keyword, acl); |
1141 |
} |
1142 |
if (acl_type == TYPE_DENIED_EXECUTE_HANDLER) { |
1143 |
struct ccs_execute_handler_record *acl |
1144 |
= container_of(ptr, struct ccs_execute_handler_record, |
1145 |
head); |
1146 |
const char *keyword = KEYWORD_DENIED_EXECUTE_HANDLER; |
1147 |
return ccs_print_execute_handler_record(head, keyword, acl); |
1148 |
} |
1149 |
if (head->read_execute_only) |
1150 |
return true; |
1151 |
if (acl_type == TYPE_MKDEV_ACL) { |
1152 |
struct ccs_mkdev_acl_record *acl |
1153 |
= container_of(ptr, struct ccs_mkdev_acl_record, head); |
1154 |
return ccs_print_mkdev_acl(head, acl, cond); |
1155 |
} |
1156 |
if (acl_type == TYPE_DOUBLE_PATH_ACL) { |
1157 |
struct ccs_double_path_acl_record *acl |
1158 |
= container_of(ptr, struct ccs_double_path_acl_record, |
1159 |
head); |
1160 |
return ccs_print_double_path_acl(head, acl, cond); |
1161 |
} |
1162 |
if (acl_type == TYPE_IOCTL_ACL) { |
1163 |
struct ccs_ioctl_acl_record *acl |
1164 |
= container_of(ptr, struct ccs_ioctl_acl_record, head); |
1165 |
return ccs_print_ioctl_acl(head, acl, cond); |
1166 |
} |
1167 |
if (acl_type == TYPE_ARGV0_ACL) { |
1168 |
struct ccs_argv0_acl_record *acl |
1169 |
= container_of(ptr, struct ccs_argv0_acl_record, head); |
1170 |
return ccs_print_argv0_acl(head, acl, cond); |
1171 |
} |
1172 |
if (acl_type == TYPE_ENV_ACL) { |
1173 |
struct ccs_env_acl_record *acl |
1174 |
= container_of(ptr, struct ccs_env_acl_record, head); |
1175 |
return ccs_print_env_acl(head, acl, cond); |
1176 |
} |
1177 |
if (acl_type == TYPE_CAPABILITY_ACL) { |
1178 |
struct ccs_capability_acl_record *acl |
1179 |
= container_of(ptr, struct ccs_capability_acl_record, |
1180 |
head); |
1181 |
return ccs_print_capability_acl(head, acl, cond); |
1182 |
} |
1183 |
if (acl_type == TYPE_IP_NETWORK_ACL) { |
1184 |
struct ccs_ip_network_acl_record *acl |
1185 |
= container_of(ptr, struct ccs_ip_network_acl_record, |
1186 |
head); |
1187 |
return ccs_print_network_acl(head, acl, cond); |
1188 |
} |
1189 |
if (acl_type == TYPE_SIGNAL_ACL) { |
1190 |
struct ccs_signal_acl_record *acl |
1191 |
= container_of(ptr, struct ccs_signal_acl_record, head); |
1192 |
return ccs_print_signal_acl(head, acl, cond); |
1193 |
} |
1194 |
if (acl_type == TYPE_MOUNT_ACL) { |
1195 |
struct ccs_mount_acl_record *acl |
1196 |
= container_of(ptr, struct ccs_mount_acl_record, head); |
1197 |
return ccs_print_mount_acl(head, acl, cond); |
1198 |
} |
1199 |
if (acl_type == TYPE_UMOUNT_ACL) { |
1200 |
struct ccs_umount_acl_record *acl |
1201 |
= container_of(ptr, struct ccs_umount_acl_record, head); |
1202 |
return ccs_print_umount_acl(head, acl, cond); |
1203 |
} |
1204 |
if (acl_type == TYPE_CHROOT_ACL) { |
1205 |
struct ccs_chroot_acl_record *acl |
1206 |
= container_of(ptr, struct ccs_chroot_acl_record, head); |
1207 |
return ccs_print_chroot_acl(head, acl, cond); |
1208 |
} |
1209 |
if (acl_type == TYPE_PIVOT_ROOT_ACL) { |
1210 |
struct ccs_pivot_root_acl_record *acl |
1211 |
= container_of(ptr, struct ccs_pivot_root_acl_record, |
1212 |
head); |
1213 |
return ccs_print_pivot_root_acl(head, acl, cond); |
1214 |
} |
1215 |
/* Workaround for gcc 3.2.2's inline bug. */ |
1216 |
if (acl_type & ACL_DELETED) |
1217 |
return true; |
1218 |
BUG(); /* This must not happen. */ |
1219 |
return false; |
1220 |
} |
1221 |
|
1222 |
/** |
1223 |
* ccs_read_domain_policy - Read domain policy. |
1224 |
* |
1225 |
* @head: Pointer to "struct ccs_io_buffer". |
1226 |
* |
1227 |
* Returns 0. |
1228 |
* |
1229 |
* Caller holds ccs_read_lock(). |
1230 |
*/ |
1231 |
static int ccs_read_domain_policy(struct ccs_io_buffer *head) |
1232 |
{ |
1233 |
struct list_head *dpos; |
1234 |
struct list_head *apos; |
1235 |
ccs_check_read_lock(); |
1236 |
if (head->read_eof) |
1237 |
return 0; |
1238 |
if (head->read_step == 0) |
1239 |
head->read_step = 1; |
1240 |
list_for_each_cookie(dpos, head->read_var1, &ccs_domain_list) { |
1241 |
struct ccs_domain_info *domain; |
1242 |
const char *quota_exceeded = ""; |
1243 |
const char *transition_failed = ""; |
1244 |
const char *ignore_global_allow_read = ""; |
1245 |
const char *ignore_global_allow_env = ""; |
1246 |
domain = list_entry(dpos, struct ccs_domain_info, list); |
1247 |
if (head->read_step != 1) |
1248 |
goto acl_loop; |
1249 |
if (domain->is_deleted && !head->read_single_domain) |
1250 |
continue; |
1251 |
/* Print domainname and flags. */ |
1252 |
if (domain->quota_warned) |
1253 |
quota_exceeded = "quota_exceeded\n"; |
1254 |
if (domain->domain_transition_failed) |
1255 |
transition_failed = "transition_failed\n"; |
1256 |
if (domain->ignore_global_allow_read) |
1257 |
ignore_global_allow_read |
1258 |
= KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; |
1259 |
if (domain->ignore_global_allow_env) |
1260 |
ignore_global_allow_env |
1261 |
= KEYWORD_IGNORE_GLOBAL_ALLOW_ENV "\n"; |
1262 |
if (!ccs_io_printf(head, "%s\n" KEYWORD_USE_PROFILE "%u\n" |
1263 |
"%s%s%s%s\n", domain->domainname->name, |
1264 |
domain->profile, quota_exceeded, |
1265 |
transition_failed, |
1266 |
ignore_global_allow_read, |
1267 |
ignore_global_allow_env)) |
1268 |
return 0; |
1269 |
head->read_step = 2; |
1270 |
acl_loop: |
1271 |
if (head->read_step == 3) |
1272 |
goto tail_mark; |
1273 |
/* Print ACL entries in the domain. */ |
1274 |
list_for_each_cookie(apos, head->read_var2, |
1275 |
&domain->acl_info_list) { |
1276 |
struct ccs_acl_info *ptr |
1277 |
= list_entry(apos, struct ccs_acl_info, list); |
1278 |
if (!ccs_print_entry(head, ptr)) |
1279 |
return 0; |
1280 |
} |
1281 |
head->read_step = 3; |
1282 |
tail_mark: |
1283 |
if (!ccs_io_printf(head, "\n")) |
1284 |
return 0; |
1285 |
head->read_step = 1; |
1286 |
if (head->read_single_domain) |
1287 |
break; |
1288 |
} |
1289 |
head->read_eof = true; |
1290 |
return 0; |
1291 |
} |
1292 |
|
1293 |
/** |
1294 |
* ccs_write_domain_profile - Assign profile for specified domain. |
1295 |
* |
1296 |
* @head: Pointer to "struct ccs_io_buffer". |
1297 |
* |
1298 |
* Returns 0 on success, -EINVAL otherwise. |
1299 |
* |
1300 |
* This is equivalent to doing |
1301 |
* |
1302 |
* ( echo "select " $domainname; echo "use_profile " $profile ) | |
1303 |
* /usr/lib/ccs/loadpolicy -d |
1304 |
* |
1305 |
* Caller holds ccs_read_lock(). |
1306 |
*/ |
1307 |
static int ccs_write_domain_profile(struct ccs_io_buffer *head) |
1308 |
{ |
1309 |
char *data = head->write_buf; |
1310 |
char *cp = strchr(data, ' '); |
1311 |
struct ccs_domain_info *domain; |
1312 |
unsigned int profile; |
1313 |
ccs_check_read_lock(); |
1314 |
if (!cp) |
1315 |
return -EINVAL; |
1316 |
*cp = '\0'; |
1317 |
profile = simple_strtoul(data, NULL, 10); |
1318 |
if (profile >= MAX_PROFILES) |
1319 |
return -EINVAL; |
1320 |
domain = ccs_find_domain(cp + 1); |
1321 |
if (domain && (ccs_profile_ptr[profile] || !ccs_policy_loaded)) |
1322 |
domain->profile = (u8) profile; |
1323 |
return 0; |
1324 |
} |
1325 |
|
1326 |
/** |
1327 |
* ccs_read_domain_profile - Read only domainname and profile. |
1328 |
* |
1329 |
* @head: Pointer to "struct ccs_io_buffer". |
1330 |
* |
1331 |
* Returns list of profile number and domainname pairs. |
1332 |
* |
1333 |
* This is equivalent to doing |
1334 |
* |
1335 |
* grep -A 1 '^<kernel>' /proc/ccs/domain_policy | |
1336 |
* awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) |
1337 |
* domainname = $0; } else if ( $1 == "use_profile" ) { |
1338 |
* print $2 " " domainname; domainname = ""; } } ; ' |
1339 |
* |
1340 |
* Caller holds ccs_read_lock(). |
1341 |
*/ |
1342 |
static int ccs_read_domain_profile(struct ccs_io_buffer *head) |
1343 |
{ |
1344 |
struct list_head *pos; |
1345 |
ccs_check_read_lock(); |
1346 |
if (head->read_eof) |
1347 |
return 0; |
1348 |
list_for_each_cookie(pos, head->read_var1, &ccs_domain_list) { |
1349 |
struct ccs_domain_info *domain; |
1350 |
domain = list_entry(pos, struct ccs_domain_info, list); |
1351 |
if (domain->is_deleted) |
1352 |
continue; |
1353 |
if (!ccs_io_printf(head, "%u %s\n", domain->profile, |
1354 |
domain->domainname->name)) |
1355 |
return 0; |
1356 |
} |
1357 |
head->read_eof = true; |
1358 |
return 0; |
1359 |
} |
1360 |
|
1361 |
/** |
1362 |
* ccs_write_pid: Specify PID to obtain domainname. |
1363 |
* |
1364 |
* @head: Pointer to "struct ccs_io_buffer". |
1365 |
* |
1366 |
* Returns 0. |
1367 |
*/ |
1368 |
static int ccs_write_pid(struct ccs_io_buffer *head) |
1369 |
{ |
1370 |
head->read_eof = false; |
1371 |
return 0; |
1372 |
} |
1373 |
|
1374 |
/** |
1375 |
* ccs_read_pid - Read information of a process. |
1376 |
* |
1377 |
* @head: Pointer to "struct ccs_io_buffer". |
1378 |
* |
1379 |
* Returns the domainname which the specified PID is in or |
1380 |
* process information of the specified PID on success, |
1381 |
* empty string otherwise. |
1382 |
* |
1383 |
* Caller holds ccs_read_lock(). |
1384 |
*/ |
1385 |
static int ccs_read_pid(struct ccs_io_buffer *head) |
1386 |
{ |
1387 |
char *buf = head->write_buf; |
1388 |
bool task_info = false; |
1389 |
unsigned int pid; |
1390 |
struct task_struct *p; |
1391 |
struct ccs_domain_info *domain = NULL; |
1392 |
u32 ccs_flags = 0; |
1393 |
ccs_check_read_lock(); |
1394 |
/* Accessing write_buf is safe because head->io_sem is held. */ |
1395 |
if (!buf) |
1396 |
goto done; /* Do nothing if open(O_RDONLY). */ |
1397 |
if (head->read_avail || head->read_eof) |
1398 |
goto done; |
1399 |
head->read_eof = true; |
1400 |
if (ccs_str_starts(&buf, "info ")) |
1401 |
task_info = true; |
1402 |
pid = (unsigned int) simple_strtoul(buf, NULL, 10); |
1403 |
/***** CRITICAL SECTION START *****/ |
1404 |
read_lock(&tasklist_lock); |
1405 |
p = find_task_by_pid(pid); |
1406 |
if (p) { |
1407 |
domain = ccs_task_domain(p); |
1408 |
ccs_flags = p->ccs_flags; |
1409 |
} |
1410 |
read_unlock(&tasklist_lock); |
1411 |
/***** CRITICAL SECTION END *****/ |
1412 |
if (!domain) |
1413 |
goto done; |
1414 |
if (!task_info) |
1415 |
ccs_io_printf(head, "%u %u %s", pid, domain->profile, |
1416 |
domain->domainname->name); |
1417 |
else |
1418 |
ccs_io_printf(head, "%u manager=%s execute_handler=%s " |
1419 |
"state[0]=%u state[1]=%u state[2]=%u", pid, |
1420 |
ccs_flags & CCS_TASK_IS_POLICY_MANAGER ? |
1421 |
"yes" : "no", |
1422 |
ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER ? |
1423 |
"yes" : "no", |
1424 |
(u8) (ccs_flags >> 24), |
1425 |
(u8) (ccs_flags >> 16), |
1426 |
(u8) (ccs_flags >> 8)); |
1427 |
done: |
1428 |
return 0; |
1429 |
} |
1430 |
|
1431 |
/** |
1432 |
* ccs_write_exception_policy - Write exception policy. |
1433 |
* |
1434 |
* @head: Pointer to "struct ccs_io_buffer". |
1435 |
* |
1436 |
* Returns 0 on success, negative value otherwise. |
1437 |
*/ |
1438 |
static int ccs_write_exception_policy(struct ccs_io_buffer *head) |
1439 |
{ |
1440 |
char *data = head->write_buf; |
1441 |
bool is_delete = ccs_str_starts(&data, KEYWORD_DELETE); |
1442 |
if (ccs_str_starts(&data, KEYWORD_KEEP_DOMAIN)) |
1443 |
return ccs_write_domain_keeper_policy(data, false, is_delete); |
1444 |
if (ccs_str_starts(&data, KEYWORD_NO_KEEP_DOMAIN)) |
1445 |
return ccs_write_domain_keeper_policy(data, true, is_delete); |
1446 |
if (ccs_str_starts(&data, KEYWORD_INITIALIZE_DOMAIN)) |
1447 |
return ccs_write_domain_initializer_policy(data, false, |
1448 |
is_delete); |
1449 |
if (ccs_str_starts(&data, KEYWORD_NO_INITIALIZE_DOMAIN)) |
1450 |
return ccs_write_domain_initializer_policy(data, true, |
1451 |
is_delete); |
1452 |
if (ccs_str_starts(&data, KEYWORD_AGGREGATOR)) |
1453 |
return ccs_write_aggregator_policy(data, is_delete); |
1454 |
if (ccs_str_starts(&data, KEYWORD_ALLOW_READ)) |
1455 |
return ccs_write_globally_readable_policy(data, is_delete); |
1456 |
if (ccs_str_starts(&data, KEYWORD_ALLOW_ENV)) |
1457 |
return ccs_write_globally_usable_env_policy(data, is_delete); |
1458 |
if (ccs_str_starts(&data, KEYWORD_FILE_PATTERN)) |
1459 |
return ccs_write_pattern_policy(data, is_delete); |
1460 |
if (ccs_str_starts(&data, KEYWORD_PATH_GROUP)) |
1461 |
return ccs_write_path_group_policy(data, is_delete); |
1462 |
if (ccs_str_starts(&data, KEYWORD_NUMBER_GROUP)) |
1463 |
return ccs_write_number_group_policy(data, is_delete); |
1464 |
if (ccs_str_starts(&data, KEYWORD_DENY_REWRITE)) |
1465 |
return ccs_write_no_rewrite_policy(data, is_delete); |
1466 |
if (ccs_str_starts(&data, KEYWORD_ADDRESS_GROUP)) |
1467 |
return ccs_write_address_group_policy(data, is_delete); |
1468 |
if (ccs_str_starts(&data, KEYWORD_DENY_AUTOBIND)) |
1469 |
return ccs_write_reserved_port_policy(data, is_delete); |
1470 |
return -EINVAL; |
1471 |
} |
1472 |
|
1473 |
/** |
1474 |
* ccs_read_exception_policy - Read exception policy. |
1475 |
* |
1476 |
* @head: Pointer to "struct ccs_io_buffer". |
1477 |
* |
1478 |
* Returns 0 on success, -EINVAL otherwise. |
1479 |
* |
1480 |
* Caller holds ccs_read_lock(). |
1481 |
*/ |
1482 |
static int ccs_read_exception_policy(struct ccs_io_buffer *head) |
1483 |
{ |
1484 |
ccs_check_read_lock(); |
1485 |
if (!head->read_eof) { |
1486 |
switch (head->read_step) { |
1487 |
case 0: |
1488 |
head->read_var2 = NULL; |
1489 |
head->read_step = 1; |
1490 |
case 1: |
1491 |
if (!ccs_read_domain_keeper_policy(head)) |
1492 |
break; |
1493 |
head->read_var2 = NULL; |
1494 |
head->read_step = 2; |
1495 |
case 2: |
1496 |
if (!ccs_read_globally_readable_policy(head)) |
1497 |
break; |
1498 |
head->read_var2 = NULL; |
1499 |
head->read_step = 3; |
1500 |
case 3: |
1501 |
if (!ccs_read_globally_usable_env_policy(head)) |
1502 |
break; |
1503 |
head->read_var2 = NULL; |
1504 |
head->read_step = 4; |
1505 |
case 4: |
1506 |
if (!ccs_read_domain_initializer_policy(head)) |
1507 |
break; |
1508 |
head->read_var2 = NULL; |
1509 |
head->read_step = 6; |
1510 |
case 6: |
1511 |
if (!ccs_read_aggregator_policy(head)) |
1512 |
break; |
1513 |
head->read_var2 = NULL; |
1514 |
head->read_step = 7; |
1515 |
case 7: |
1516 |
if (!ccs_read_file_pattern(head)) |
1517 |
break; |
1518 |
head->read_var2 = NULL; |
1519 |
head->read_step = 8; |
1520 |
case 8: |
1521 |
if (!ccs_read_no_rewrite_policy(head)) |
1522 |
break; |
1523 |
head->read_var2 = NULL; |
1524 |
head->read_step = 9; |
1525 |
case 9: |
1526 |
if (!ccs_read_path_group_policy(head)) |
1527 |
break; |
1528 |
head->read_var1 = NULL; |
1529 |
head->read_var2 = NULL; |
1530 |
head->read_step = 10; |
1531 |
case 10: |
1532 |
if (!ccs_read_number_group_policy(head)) |
1533 |
break; |
1534 |
head->read_var1 = NULL; |
1535 |
head->read_var2 = NULL; |
1536 |
head->read_step = 11; |
1537 |
case 11: |
1538 |
if (!ccs_read_address_group_policy(head)) |
1539 |
break; |
1540 |
head->read_var2 = NULL; |
1541 |
head->read_step = 12; |
1542 |
case 12: |
1543 |
if (!ccs_read_reserved_port_policy(head)) |
1544 |
break; |
1545 |
head->read_eof = true; |
1546 |
break; |
1547 |
default: |
1548 |
return -EINVAL; |
1549 |
} |
1550 |
} |
1551 |
return 0; |
1552 |
} |
1553 |
|
1554 |
/* Wait queue for ccs_query_list. */ |
1555 |
static DECLARE_WAIT_QUEUE_HEAD(ccs_query_wait); |
1556 |
|
1557 |
/* Lock for manipulating ccs_query_list. */ |
1558 |
static DEFINE_SPINLOCK(ccs_query_list_lock); |
1559 |
|
1560 |
/* Structure for query. */ |
1561 |
struct ccs_query_entry { |
1562 |
struct list_head list; |
1563 |
char *query; |
1564 |
int query_len; |
1565 |
unsigned int serial; |
1566 |
int timer; |
1567 |
int answer; |
1568 |
}; |
1569 |
|
1570 |
/* The list for "struct ccs_query_entry". */ |
1571 |
static LIST_HEAD(ccs_query_list); |
1572 |
|
1573 |
/* Number of "struct file" referring /proc/ccs/query interface. */ |
1574 |
static atomic_t ccs_query_observers = ATOMIC_INIT(0); |
1575 |
|
1576 |
/** |
1577 |
* ccs_check_supervisor - Ask for the supervisor's decision. |
1578 |
* |
1579 |
* @r: Pointer to "struct ccs_request_info". |
1580 |
* @fmt: The printf()'s format string, followed by parameters. |
1581 |
* |
1582 |
* Returns 0 if the supervisor decided to permit the access request which |
1583 |
* violated the policy in enforcing mode, 1 if the supervisor decided to |
1584 |
* retry the access request which violated the policy in enforcing mode, |
1585 |
* -EPERM otherwise. |
1586 |
*/ |
1587 |
int ccs_check_supervisor(struct ccs_request_info *r, const char *fmt, ...) |
1588 |
{ |
1589 |
va_list args; |
1590 |
int error = -EPERM; |
1591 |
int pos; |
1592 |
int len; |
1593 |
static unsigned int ccs_serial; |
1594 |
struct ccs_query_entry *ccs_query_entry = NULL; |
1595 |
bool quota_exceeded = false; |
1596 |
char *header; |
1597 |
if (!r->domain) |
1598 |
r->domain = ccs_current_domain(); |
1599 |
if (!atomic_read(&ccs_query_observers)) { |
1600 |
int i; |
1601 |
if (current->ccs_flags & CCS_DONT_SLEEP_ON_ENFORCE_ERROR) |
1602 |
return -EPERM; |
1603 |
for (i = 0; i < ccs_check_flags(r->domain, CCS_SLEEP_PERIOD); |
1604 |
i++) { |
1605 |
set_current_state(TASK_INTERRUPTIBLE); |
1606 |
schedule_timeout(HZ / 10); |
1607 |
} |
1608 |
return -EPERM; |
1609 |
} |
1610 |
va_start(args, fmt); |
1611 |
len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; |
1612 |
va_end(args); |
1613 |
header = ccs_init_audit_log(&len, r); |
1614 |
if (!header) |
1615 |
goto out; |
1616 |
ccs_query_entry = kzalloc(sizeof(*ccs_query_entry), GFP_KERNEL); |
1617 |
if (!ccs_query_entry) |
1618 |
goto out; |
1619 |
ccs_query_entry->query = kzalloc(len, GFP_KERNEL); |
1620 |
if (!ccs_query_entry->query) |
1621 |
goto out; |
1622 |
INIT_LIST_HEAD(&ccs_query_entry->list); |
1623 |
/***** CRITICAL SECTION START *****/ |
1624 |
spin_lock(&ccs_query_list_lock); |
1625 |
if (ccs_quota_for_query && ccs_query_memory_size + len + |
1626 |
sizeof(*ccs_query_entry) >= ccs_quota_for_query) { |
1627 |
quota_exceeded = true; |
1628 |
} else { |
1629 |
ccs_query_memory_size += len + sizeof(*ccs_query_entry); |
1630 |
ccs_query_entry->serial = ccs_serial++; |
1631 |
} |
1632 |
spin_unlock(&ccs_query_list_lock); |
1633 |
/***** CRITICAL SECTION END *****/ |
1634 |
if (quota_exceeded) |
1635 |
goto out; |
1636 |
pos = snprintf(ccs_query_entry->query, len - 1, "Q%u-%hu\n%s", |
1637 |
ccs_query_entry->serial, r->retry, header); |
1638 |
kfree(header); |
1639 |
header = NULL; |
1640 |
va_start(args, fmt); |
1641 |
vsnprintf(ccs_query_entry->query + pos, len - 1 - pos, fmt, args); |
1642 |
ccs_query_entry->query_len = strlen(ccs_query_entry->query) + 1; |
1643 |
va_end(args); |
1644 |
/***** CRITICAL SECTION START *****/ |
1645 |
spin_lock(&ccs_query_list_lock); |
1646 |
list_add_tail(&ccs_query_entry->list, &ccs_query_list); |
1647 |
spin_unlock(&ccs_query_list_lock); |
1648 |
/***** CRITICAL SECTION END *****/ |
1649 |
/* Give 10 seconds for supervisor's opinion. */ |
1650 |
for (ccs_query_entry->timer = 0; |
1651 |
atomic_read(&ccs_query_observers) && ccs_query_entry->timer < 100; |
1652 |
ccs_query_entry->timer++) { |
1653 |
wake_up(&ccs_query_wait); |
1654 |
set_current_state(TASK_INTERRUPTIBLE); |
1655 |
schedule_timeout(HZ / 10); |
1656 |
if (ccs_query_entry->answer) |
1657 |
break; |
1658 |
} |
1659 |
/***** CRITICAL SECTION START *****/ |
1660 |
spin_lock(&ccs_query_list_lock); |
1661 |
list_del(&ccs_query_entry->list); |
1662 |
ccs_query_memory_size -= len + sizeof(*ccs_query_entry); |
1663 |
spin_unlock(&ccs_query_list_lock); |
1664 |
/***** CRITICAL SECTION END *****/ |
1665 |
switch (ccs_query_entry->answer) { |
1666 |
case 3: /* Asked to retry by administrator. */ |
1667 |
error = 1; |
1668 |
r->retry++; |
1669 |
break; |
1670 |
case 1: |
1671 |
/* Granted by administrator. */ |
1672 |
error = 0; |
1673 |
break; |
1674 |
case 0: |
1675 |
/* Timed out. */ |
1676 |
break; |
1677 |
default: |
1678 |
/* Rejected by administrator. */ |
1679 |
break; |
1680 |
} |
1681 |
out: |
1682 |
if (ccs_query_entry) |
1683 |
kfree(ccs_query_entry->query); |
1684 |
kfree(ccs_query_entry); |
1685 |
kfree(header); |
1686 |
return error; |
1687 |
} |
1688 |
|
1689 |
/** |
1690 |
* ccs_poll_query - poll() for /proc/ccs/query. |
1691 |
* |
1692 |
* @file: Pointer to "struct file". |
1693 |
* @wait: Pointer to "poll_table". |
1694 |
* |
1695 |
* Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. |
1696 |
* |
1697 |
* Waits for access requests which violated policy in enforcing mode. |
1698 |
*/ |
1699 |
static int ccs_poll_query(struct file *file, poll_table *wait) |
1700 |
{ |
1701 |
struct list_head *tmp; |
1702 |
bool found = false; |
1703 |
u8 i; |
1704 |
for (i = 0; i < 2; i++) { |
1705 |
/***** CRITICAL SECTION START *****/ |
1706 |
spin_lock(&ccs_query_list_lock); |
1707 |
list_for_each(tmp, &ccs_query_list) { |
1708 |
struct ccs_query_entry *ptr |
1709 |
= list_entry(tmp, struct ccs_query_entry, list); |
1710 |
if (ptr->answer) |
1711 |
continue; |
1712 |
found = true; |
1713 |
break; |
1714 |
} |
1715 |
spin_unlock(&ccs_query_list_lock); |
1716 |
/***** CRITICAL SECTION END *****/ |
1717 |
if (found) |
1718 |
return POLLIN | POLLRDNORM; |
1719 |
if (i) |
1720 |
break; |
1721 |
poll_wait(file, &ccs_query_wait, wait); |
1722 |
} |
1723 |
return 0; |
1724 |
} |
1725 |
|
1726 |
/** |
1727 |
* ccs_read_query - Read access requests which violated policy in enforcing mode. |
1728 |
* |
1729 |
* @head: Pointer to "struct ccs_io_buffer". |
1730 |
* |
1731 |
* Returns 0. |
1732 |
*/ |
1733 |
static int ccs_read_query(struct ccs_io_buffer *head) |
1734 |
{ |
1735 |
struct list_head *tmp; |
1736 |
int pos = 0; |
1737 |
int len = 0; |
1738 |
char *buf; |
1739 |
if (head->read_avail) |
1740 |
return 0; |
1741 |
if (head->read_buf) { |
1742 |
kfree(head->read_buf); |
1743 |
head->read_buf = NULL; |
1744 |
head->readbuf_size = 0; |
1745 |
} |
1746 |
/***** CRITICAL SECTION START *****/ |
1747 |
spin_lock(&ccs_query_list_lock); |
1748 |
list_for_each(tmp, &ccs_query_list) { |
1749 |
struct ccs_query_entry *ptr |
1750 |
= list_entry(tmp, struct ccs_query_entry, list); |
1751 |
if (ptr->answer) |
1752 |
continue; |
1753 |
if (pos++ != head->read_step) |
1754 |
continue; |
1755 |
len = ptr->query_len; |
1756 |
break; |
1757 |
} |
1758 |
spin_unlock(&ccs_query_list_lock); |
1759 |
/***** CRITICAL SECTION END *****/ |
1760 |
if (!len) { |
1761 |
head->read_step = 0; |
1762 |
return 0; |
1763 |
} |
1764 |
buf = kzalloc(len, GFP_KERNEL); |
1765 |
if (!buf) |
1766 |
return 0; |
1767 |
pos = 0; |
1768 |
/***** CRITICAL SECTION START *****/ |
1769 |
spin_lock(&ccs_query_list_lock); |
1770 |
list_for_each(tmp, &ccs_query_list) { |
1771 |
struct ccs_query_entry *ptr |
1772 |
= list_entry(tmp, struct ccs_query_entry, list); |
1773 |
if (ptr->answer) |
1774 |
continue; |
1775 |
if (pos++ != head->read_step) |
1776 |
continue; |
1777 |
/* |
1778 |
* Some query can be skipped because ccs_query_list |
1779 |
* can change, but I don't care. |
1780 |
*/ |
1781 |
if (len == ptr->query_len) |
1782 |
memmove(buf, ptr->query, len); |
1783 |
break; |
1784 |
} |
1785 |
spin_unlock(&ccs_query_list_lock); |
1786 |
/***** CRITICAL SECTION END *****/ |
1787 |
if (buf[0]) { |
1788 |
head->read_avail = len; |
1789 |
head->readbuf_size = head->read_avail; |
1790 |
head->read_buf = buf; |
1791 |
head->read_step++; |
1792 |
} else { |
1793 |
kfree(buf); |
1794 |
} |
1795 |
return 0; |
1796 |
} |
1797 |
|
1798 |
/** |
1799 |
* ccs_write_answer - Write the supervisor's decision. |
1800 |
* |
1801 |
* @head: Pointer to "struct ccs_io_buffer". |
1802 |
* |
1803 |
* Returns 0 on success, -EINVAL otherwise. |
1804 |
*/ |
1805 |
static int ccs_write_answer(struct ccs_io_buffer *head) |
1806 |
{ |
1807 |
char *data = head->write_buf; |
1808 |
struct list_head *tmp; |
1809 |
unsigned int serial; |
1810 |
unsigned int answer; |
1811 |
/***** CRITICAL SECTION START *****/ |
1812 |
spin_lock(&ccs_query_list_lock); |
1813 |
list_for_each(tmp, &ccs_query_list) { |
1814 |
struct ccs_query_entry *ptr |
1815 |
= list_entry(tmp, struct ccs_query_entry, list); |
1816 |
ptr->timer = 0; |
1817 |
} |
1818 |
spin_unlock(&ccs_query_list_lock); |
1819 |
/***** CRITICAL SECTION END *****/ |
1820 |
if (sscanf(data, "A%u=%u", &serial, &answer) != 2) |
1821 |
return -EINVAL; |
1822 |
/***** CRITICAL SECTION START *****/ |
1823 |
spin_lock(&ccs_query_list_lock); |
1824 |
list_for_each(tmp, &ccs_query_list) { |
1825 |
struct ccs_query_entry *ptr |
1826 |
= list_entry(tmp, struct ccs_query_entry, list); |
1827 |
if (ptr->serial != serial) |
1828 |
continue; |
1829 |
if (!ptr->answer) |
1830 |
ptr->answer = answer; |
1831 |
break; |
1832 |
} |
1833 |
spin_unlock(&ccs_query_list_lock); |
1834 |
/***** CRITICAL SECTION END *****/ |
1835 |
return 0; |
1836 |
} |
1837 |
|
1838 |
/** |
1839 |
* ccs_read_version: Get version. |
1840 |
* |
1841 |
* @head: Pointer to "struct ccs_io_buffer". |
1842 |
* |
1843 |
* Returns version information. |
1844 |
*/ |
1845 |
static int ccs_read_version(struct ccs_io_buffer *head) |
1846 |
{ |
1847 |
if (!head->read_eof) { |
1848 |
ccs_io_printf(head, "1.7.0-pre"); |
1849 |
head->read_eof = true; |
1850 |
} |
1851 |
return 0; |
1852 |
} |
1853 |
|
1854 |
/** |
1855 |
* ccs_read_self_domain - Get the current process's domainname. |
1856 |
* |
1857 |
* @head: Pointer to "struct ccs_io_buffer". |
1858 |
* |
1859 |
* Returns the current process's domainname. |
1860 |
*/ |
1861 |
static int ccs_read_self_domain(struct ccs_io_buffer *head) |
1862 |
{ |
1863 |
if (!head->read_eof) { |
1864 |
/* |
1865 |
* ccs_current_domain()->domainname != NULL |
1866 |
* because every process belongs to a domain and |
1867 |
* the domain's name cannot be NULL. |
1868 |
*/ |
1869 |
ccs_io_printf(head, "%s", |
1870 |
ccs_current_domain()->domainname->name); |
1871 |
head->read_eof = true; |
1872 |
} |
1873 |
return 0; |
1874 |
} |
1875 |
|
1876 |
/** |
1877 |
* ccs_open_control - open() for /proc/ccs/ interface. |
1878 |
* |
1879 |
* @type: Type of interface. |
1880 |
* @file: Pointer to "struct file". |
1881 |
* |
1882 |
* Associates policy handler and returns 0 on success, -ENOMEM otherwise. |
1883 |
*/ |
1884 |
int ccs_open_control(const u8 type, struct file *file) |
1885 |
{ |
1886 |
struct ccs_io_buffer *head = kzalloc(sizeof(*head), GFP_KERNEL); |
1887 |
if (!head) |
1888 |
return -ENOMEM; |
1889 |
mutex_init(&head->io_sem); |
1890 |
head->type = type; |
1891 |
switch (type) { |
1892 |
case CCS_DOMAINPOLICY: /* /proc/ccs/domain_policy */ |
1893 |
head->write = ccs_write_domain_policy; |
1894 |
head->read = ccs_read_domain_policy; |
1895 |
break; |
1896 |
case CCS_EXCEPTIONPOLICY: /* /proc/ccs/exception_policy */ |
1897 |
head->write = ccs_write_exception_policy; |
1898 |
head->read = ccs_read_exception_policy; |
1899 |
break; |
1900 |
#ifdef CONFIG_CCSECURITY_AUDIT |
1901 |
case CCS_GRANTLOG: /* /proc/ccs/grant_log */ |
1902 |
head->poll = ccs_poll_grant_log; |
1903 |
head->read = ccs_read_grant_log; |
1904 |
break; |
1905 |
case CCS_REJECTLOG: /* /proc/ccs/reject_log */ |
1906 |
head->poll = ccs_poll_reject_log; |
1907 |
head->read = ccs_read_reject_log; |
1908 |
break; |
1909 |
#endif |
1910 |
case CCS_SELFDOMAIN: /* /proc/ccs/self_domain */ |
1911 |
head->read = ccs_read_self_domain; |
1912 |
break; |
1913 |
case CCS_DOMAIN_STATUS: /* /proc/ccs/.domain_status */ |
1914 |
head->write = ccs_write_domain_profile; |
1915 |
head->read = ccs_read_domain_profile; |
1916 |
break; |
1917 |
case CCS_EXECUTE_HANDLER: /* /proc/ccs/.execute_handler */ |
1918 |
/* Allow execute_handler to read process's status. */ |
1919 |
if (!(current->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER)) { |
1920 |
kfree(head); |
1921 |
return -EPERM; |
1922 |
} |
1923 |
/* fall through */ |
1924 |
case CCS_PROCESS_STATUS: /* /proc/ccs/.process_status */ |
1925 |
head->write = ccs_write_pid; |
1926 |
head->read = ccs_read_pid; |
1927 |
break; |
1928 |
case CCS_VERSION: /* /proc/ccs/version */ |
1929 |
head->read = ccs_read_version; |
1930 |
head->readbuf_size = 128; |
1931 |
break; |
1932 |
case CCS_MEMINFO: /* /proc/ccs/meminfo */ |
1933 |
head->write = ccs_write_memory_quota; |
1934 |
head->read = ccs_read_memory_counter; |
1935 |
head->readbuf_size = 512; |
1936 |
break; |
1937 |
case CCS_PROFILE: /* /proc/ccs/profile */ |
1938 |
head->write = ccs_write_profile; |
1939 |
head->read = ccs_read_profile; |
1940 |
break; |
1941 |
case CCS_QUERY: /* /proc/ccs/query */ |
1942 |
head->poll = ccs_poll_query; |
1943 |
head->write = ccs_write_answer; |
1944 |
head->read = ccs_read_query; |
1945 |
break; |
1946 |
case CCS_MANAGER: /* /proc/ccs/manager */ |
1947 |
head->write = ccs_write_manager_policy; |
1948 |
head->read = ccs_read_manager_policy; |
1949 |
break; |
1950 |
} |
1951 |
if (!(file->f_mode & FMODE_READ)) { |
1952 |
/* |
1953 |
* No need to allocate read_buf since it is not opened |
1954 |
* for reading. |
1955 |
*/ |
1956 |
head->read = NULL; |
1957 |
head->poll = NULL; |
1958 |
} else if (type != CCS_QUERY && |
1959 |
type != CCS_GRANTLOG && type != CCS_REJECTLOG) { |
1960 |
/* |
1961 |
* Don't allocate buffer for reading if the file is one of |
1962 |
* /proc/ccs/grant_log , /proc/ccs/reject_log , /proc/ccs/query. |
1963 |
*/ |
1964 |
if (!head->readbuf_size) |
1965 |
head->readbuf_size = 4096 * 2; |
1966 |
head->read_buf = kzalloc(head->readbuf_size, GFP_KERNEL); |
1967 |
if (!head->read_buf) { |
1968 |
kfree(head); |
1969 |
return -ENOMEM; |
1970 |
} |
1971 |
} |
1972 |
if (!(file->f_mode & FMODE_WRITE)) { |
1973 |
/* |
1974 |
* No need to allocate write_buf since it is not opened |
1975 |
* for writing. |
1976 |
*/ |
1977 |
head->write = NULL; |
1978 |
} else if (head->write) { |
1979 |
head->writebuf_size = 4096 * 2; |
1980 |
head->write_buf = kzalloc(head->writebuf_size, GFP_KERNEL); |
1981 |
if (!head->write_buf) { |
1982 |
kfree(head->read_buf); |
1983 |
kfree(head); |
1984 |
return -ENOMEM; |
1985 |
} |
1986 |
} |
1987 |
if (type != CCS_QUERY && |
1988 |
type != CCS_GRANTLOG && type != CCS_REJECTLOG) |
1989 |
head->reader_idx = ccs_read_lock(); |
1990 |
file->private_data = head; |
1991 |
/* |
1992 |
* Call the handler now if the file is /proc/ccs/self_domain |
1993 |
* so that the user can use "cat < /proc/ccs/self_domain" to |
1994 |
* know the current process's domainname. |
1995 |
*/ |
1996 |
if (type == CCS_SELFDOMAIN) |
1997 |
ccs_read_control(file, NULL, 0); |
1998 |
/* |
1999 |
* If the file is /proc/ccs/query , increment the observer counter. |
2000 |
* The obserber counter is used by ccs_check_supervisor() to see if |
2001 |
* there is some process monitoring /proc/ccs/query. |
2002 |
*/ |
2003 |
else if (type == CCS_QUERY) |
2004 |
atomic_inc(&ccs_query_observers); |
2005 |
return 0; |
2006 |
} |
2007 |
|
2008 |
/** |
2009 |
* ccs_poll_control - poll() for /proc/ccs/ interface. |
2010 |
* |
2011 |
* @file: Pointer to "struct file". |
2012 |
* @wait: Pointer to "poll_table". |
2013 |
* |
2014 |
* Waits for read readiness. |
2015 |
* /proc/ccs/query is handled by /usr/lib/ccs/ccs-queryd and |
2016 |
* /proc/ccs/grant_log and /proc/ccs/reject_log are handled by |
2017 |
* /usr/lib/ccs/ccs-auditd. |
2018 |
*/ |
2019 |
int ccs_poll_control(struct file *file, poll_table *wait) |
2020 |
{ |
2021 |
struct ccs_io_buffer *head = file->private_data; |
2022 |
if (!head->poll) |
2023 |
return -ENOSYS; |
2024 |
return head->poll(file, wait); |
2025 |
} |
2026 |
|
2027 |
/** |
2028 |
* ccs_read_control - read() for /proc/ccs/ interface. |
2029 |
* |
2030 |
* @file: Pointer to "struct file". |
2031 |
* @buffer: Poiner to buffer to write to. |
2032 |
* @buffer_len: Size of @buffer. |
2033 |
* |
2034 |
* Returns bytes read on success, negative value otherwise. |
2035 |
*/ |
2036 |
int ccs_read_control(struct file *file, char __user *buffer, |
2037 |
const int buffer_len) |
2038 |
{ |
2039 |
int len = 0; |
2040 |
struct ccs_io_buffer *head = file->private_data; |
2041 |
char *cp; |
2042 |
if (!head->read) |
2043 |
return -ENOSYS; |
2044 |
if (!access_ok(VERIFY_WRITE, buffer, buffer_len)) |
2045 |
return -EFAULT; |
2046 |
if (mutex_lock_interruptible(&head->io_sem)) |
2047 |
return -EINTR; |
2048 |
/* Call the policy handler. */ |
2049 |
len = head->read(head); |
2050 |
if (len < 0) |
2051 |
goto out; |
2052 |
/* Write to buffer. */ |
2053 |
len = head->read_avail; |
2054 |
if (len > buffer_len) |
2055 |
len = buffer_len; |
2056 |
if (!len) |
2057 |
goto out; |
2058 |
/* head->read_buf changes by some functions. */ |
2059 |
cp = head->read_buf; |
2060 |
if (copy_to_user(buffer, cp, len)) { |
2061 |
len = -EFAULT; |
2062 |
goto out; |
2063 |
} |
2064 |
head->read_avail -= len; |
2065 |
memmove(cp, cp + len, head->read_avail); |
2066 |
out: |
2067 |
mutex_unlock(&head->io_sem); |
2068 |
return len; |
2069 |
} |
2070 |
|
2071 |
/** |
2072 |
* ccs_write_control - write() for /proc/ccs/ interface. |
2073 |
* |
2074 |
* @file: Pointer to "struct file". |
2075 |
* @buffer: Pointer to buffer to read from. |
2076 |
* @buffer_len: Size of @buffer. |
2077 |
* |
2078 |
* Returns @buffer_len on success, negative value otherwise. |
2079 |
*/ |
2080 |
int ccs_write_control(struct file *file, const char __user *buffer, |
2081 |
const int buffer_len) |
2082 |
{ |
2083 |
struct ccs_io_buffer *head = file->private_data; |
2084 |
int error = buffer_len; |
2085 |
int avail_len = buffer_len; |
2086 |
char *cp0 = head->write_buf; |
2087 |
if (!head->write) |
2088 |
return -ENOSYS; |
2089 |
if (!access_ok(VERIFY_READ, buffer, buffer_len)) |
2090 |
return -EFAULT; |
2091 |
/* Don't allow updating policies by non manager programs. */ |
2092 |
if (head->write != ccs_write_pid && |
2093 |
head->write != ccs_write_domain_policy && |
2094 |
!ccs_is_policy_manager()) |
2095 |
return -EPERM; |
2096 |
if (mutex_lock_interruptible(&head->io_sem)) |
2097 |
return -EINTR; |
2098 |
/* Read a line and dispatch it to the policy handler. */ |
2099 |
while (avail_len > 0) { |
2100 |
char c; |
2101 |
if (head->write_avail >= head->writebuf_size - 1) { |
2102 |
error = -ENOMEM; |
2103 |
break; |
2104 |
} else if (get_user(c, buffer)) { |
2105 |
error = -EFAULT; |
2106 |
break; |
2107 |
} |
2108 |
buffer++; |
2109 |
avail_len--; |
2110 |
cp0[head->write_avail++] = c; |
2111 |
if (c != '\n') |
2112 |
continue; |
2113 |
cp0[head->write_avail - 1] = '\0'; |
2114 |
head->write_avail = 0; |
2115 |
ccs_normalize_line(cp0); |
2116 |
head->write(head); |
2117 |
} |
2118 |
mutex_unlock(&head->io_sem); |
2119 |
return error; |
2120 |
} |
2121 |
|
2122 |
/** |
2123 |
* ccs_close_control - close() for /proc/ccs/ interface. |
2124 |
* |
2125 |
* @file: Pointer to "struct file". |
2126 |
* |
2127 |
* Releases memory and returns 0. |
2128 |
*/ |
2129 |
int ccs_close_control(struct file *file) |
2130 |
{ |
2131 |
struct ccs_io_buffer *head = file->private_data; |
2132 |
const bool is_write = head->write_buf != NULL; |
2133 |
const u8 type = head->type; |
2134 |
/* |
2135 |
* If the file is /proc/ccs/query , decrement the observer counter. |
2136 |
*/ |
2137 |
if (type == CCS_QUERY) |
2138 |
atomic_dec(&ccs_query_observers); |
2139 |
if (type != CCS_QUERY && |
2140 |
type != CCS_GRANTLOG && type != CCS_REJECTLOG) |
2141 |
ccs_read_unlock(head->reader_idx); |
2142 |
/* Release memory used for policy I/O. */ |
2143 |
kfree(head->read_buf); |
2144 |
head->read_buf = NULL; |
2145 |
kfree(head->write_buf); |
2146 |
head->write_buf = NULL; |
2147 |
kfree(head); |
2148 |
head = NULL; |
2149 |
file->private_data = NULL; |
2150 |
if (is_write) |
2151 |
ccs_run_gc(); |
2152 |
return 0; |
2153 |
} |