1 |
/* |
2 |
* security/ccsecurity/policy_io.c |
3 |
* |
4 |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
5 |
* |
6 |
* Version: 1.7.0-pre 2009/08/08 |
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 |
/* String table for functionality that takes 2 modes. */ |
19 |
static const char *ccs_mode_2[2] = { |
20 |
"disabled", "enabled" |
21 |
}; |
22 |
|
23 |
static const char *ccs_mode_4[4] = { |
24 |
"disabled", "learning", "permissive", "enforcing" |
25 |
}; |
26 |
|
27 |
static bool ccs_mac_keywords_used[CCS_MAX_MAC_INDEX + |
28 |
CCS_MAX_CAPABILITY_INDEX]; |
29 |
|
30 |
static const char *ccs_mac_keywords[CCS_MAX_MAC_INDEX + |
31 |
CCS_MAX_CAPABILITY_INDEX] = { |
32 |
[CCS_MAC_EXECUTE] = "execute", |
33 |
[CCS_MAC_OPEN] = "open", |
34 |
[CCS_MAC_CREATE] = "create", |
35 |
[CCS_MAC_UNLINK] = "unlink", |
36 |
[CCS_MAC_MKDIR] = "mkdir", |
37 |
[CCS_MAC_RMDIR] = "rmdir", |
38 |
[CCS_MAC_MKFIFO] = "mkfifo", |
39 |
[CCS_MAC_MKSOCK] = "mksock", |
40 |
[CCS_MAC_TRUNCATE] = "truncate", |
41 |
[CCS_MAC_SYMLINK] = "symlink", |
42 |
[CCS_MAC_REWRITE] = "rewrite", |
43 |
[CCS_MAC_MKBLOCK] = "mkblock", |
44 |
[CCS_MAC_MKCHAR] = "mkchar", |
45 |
[CCS_MAC_LINK] = "link", |
46 |
[CCS_MAC_RENAME] = "rename", |
47 |
[CCS_MAC_CHMOD] = "chmod", |
48 |
[CCS_MAC_CHOWN] = "chown", |
49 |
[CCS_MAC_CHGRP] = "chgrp", |
50 |
[CCS_MAC_IOCTL] = "ioctl", |
51 |
[CCS_MAC_CHROOT] = "chroot", |
52 |
[CCS_MAC_MOUNT] = "mount", |
53 |
[CCS_MAC_UMOUNT] = "umount", |
54 |
[CCS_MAC_PIVOT_ROOT] = "pivot_root", |
55 |
[CCS_MAC_ENVIRON] = "env", |
56 |
[CCS_MAC_NETWORK] = "network", |
57 |
[CCS_MAC_SIGNAL] = "signal", |
58 |
[CCS_MAX_MAC_INDEX + CCS_INET_STREAM_SOCKET_CREATE] |
59 |
= "inet_tcp_create", |
60 |
[CCS_MAX_MAC_INDEX + CCS_INET_STREAM_SOCKET_LISTEN] |
61 |
= "inet_tcp_listen", |
62 |
[CCS_MAX_MAC_INDEX + CCS_INET_STREAM_SOCKET_CONNECT] |
63 |
= "inet_tcp_connect", |
64 |
[CCS_MAX_MAC_INDEX + CCS_USE_INET_DGRAM_SOCKET] = "use_inet_udp", |
65 |
[CCS_MAX_MAC_INDEX + CCS_USE_INET_RAW_SOCKET] = "use_inet_ip", |
66 |
[CCS_MAX_MAC_INDEX + CCS_USE_ROUTE_SOCKET] = "use_route", |
67 |
[CCS_MAX_MAC_INDEX + CCS_USE_PACKET_SOCKET] = "use_packet", |
68 |
[CCS_MAX_MAC_INDEX + CCS_SYS_MOUNT] = "SYS_MOUNT", |
69 |
[CCS_MAX_MAC_INDEX + CCS_SYS_UMOUNT] = "SYS_UMOUNT", |
70 |
[CCS_MAX_MAC_INDEX + CCS_SYS_REBOOT] = "SYS_REBOOT", |
71 |
[CCS_MAX_MAC_INDEX + CCS_SYS_CHROOT] = "SYS_CHROOT", |
72 |
[CCS_MAX_MAC_INDEX + CCS_SYS_KILL] = "SYS_KILL", |
73 |
[CCS_MAX_MAC_INDEX + CCS_SYS_VHANGUP] = "SYS_VHANGUP", |
74 |
[CCS_MAX_MAC_INDEX + CCS_SYS_SETTIME] = "SYS_TIME", |
75 |
[CCS_MAX_MAC_INDEX + CCS_SYS_NICE] = "SYS_NICE", |
76 |
[CCS_MAX_MAC_INDEX + CCS_SYS_SETHOSTNAME] = "SYS_SETHOSTNAME", |
77 |
[CCS_MAX_MAC_INDEX + CCS_USE_KERNEL_MODULE] = "use_kernel_module", |
78 |
[CCS_MAX_MAC_INDEX + CCS_CREATE_FIFO] = "create_fifo", |
79 |
[CCS_MAX_MAC_INDEX + CCS_CREATE_BLOCK_DEV] = "create_block_dev", |
80 |
[CCS_MAX_MAC_INDEX + CCS_CREATE_CHAR_DEV] = "create_char_dev", |
81 |
[CCS_MAX_MAC_INDEX + CCS_CREATE_UNIX_SOCKET] = "create_unix_socket", |
82 |
[CCS_MAX_MAC_INDEX + CCS_SYS_LINK] = "SYS_LINK", |
83 |
[CCS_MAX_MAC_INDEX + CCS_SYS_SYMLINK] = "SYS_SYMLINK", |
84 |
[CCS_MAX_MAC_INDEX + CCS_SYS_RENAME] = "SYS_RENAME", |
85 |
[CCS_MAX_MAC_INDEX + CCS_SYS_UNLINK] = "SYS_UNLINK", |
86 |
[CCS_MAX_MAC_INDEX + CCS_SYS_CHMOD] = "SYS_CHMOD", |
87 |
[CCS_MAX_MAC_INDEX + CCS_SYS_CHOWN] = "SYS_CHOWN", |
88 |
[CCS_MAX_MAC_INDEX + CCS_SYS_IOCTL] = "SYS_IOCTL", |
89 |
[CCS_MAX_MAC_INDEX + CCS_SYS_KEXEC_LOAD] = "SYS_KEXEC_LOAD", |
90 |
[CCS_MAX_MAC_INDEX + CCS_SYS_PIVOT_ROOT] = "SYS_PIVOT_ROOT", |
91 |
[CCS_MAX_MAC_INDEX + CCS_SYS_PTRACE] = "SYS_PTRACE", |
92 |
[CCS_MAX_MAC_INDEX + CCS_CONCEAL_MOUNT] = "conceal_mount" |
93 |
}; |
94 |
|
95 |
/* Table for profile. */ |
96 |
static struct { |
97 |
const char *keyword; |
98 |
unsigned int current_value; |
99 |
const unsigned int max_value; |
100 |
} ccs_control_array[CCS_MAX_CONTROL_INDEX] = { |
101 |
[CCS_AUTOLEARN_EXEC_REALPATH] = { "AUTOLEARN_EXEC_REALPATH", 0, 1 }, |
102 |
[CCS_AUTOLEARN_EXEC_ARGV0] = { "AUTOLEARN_EXEC_ARGV0", 0, 1 }, |
103 |
[CCS_MAX_ACCEPT_ENTRY] |
104 |
= { "MAX_ACCEPT_ENTRY", CONFIG_CCSECURITY_MAX_ACCEPT_ENTRY, INT_MAX }, |
105 |
#ifdef CONFIG_CCSECURITY_AUDIT |
106 |
[CCS_MAX_GRANT_LOG] |
107 |
= { "MAX_GRANT_LOG", CONFIG_CCSECURITY_MAX_GRANT_LOG, INT_MAX }, |
108 |
[CCS_MAX_REJECT_LOG] |
109 |
= { "MAX_REJECT_LOG", CONFIG_CCSECURITY_MAX_REJECT_LOG, INT_MAX }, |
110 |
#endif |
111 |
[CCS_VERBOSE] = { "PRINT_VIOLATION", 1, 1 }, |
112 |
[CCS_SLEEP_PERIOD] = { "SLEEP_PERIOD", 0, 3000 }, /* in 0.1 second */ |
113 |
}; |
114 |
|
115 |
/* Permit policy management by non-root user? */ |
116 |
static bool ccs_manage_by_non_root; |
117 |
|
118 |
/** |
119 |
* ccs_cap2keyword - Convert capability operation to capability name. |
120 |
* |
121 |
* @operation: The capability index. |
122 |
* |
123 |
* Returns the name of the specified capability's name. |
124 |
*/ |
125 |
const char *ccs_cap2keyword(const u8 operation) |
126 |
{ |
127 |
return operation < CCS_MAX_CAPABILITY_INDEX |
128 |
? ccs_mac_keywords[CCS_MAX_MAC_INDEX + operation] : NULL; |
129 |
} |
130 |
|
131 |
/** |
132 |
* ccs_quiet_setup - Set CCS_VERBOSE=0 by default. |
133 |
* |
134 |
* @str: Unused. |
135 |
* |
136 |
* Returns 0. |
137 |
*/ |
138 |
static int __init ccs_quiet_setup(char *str) |
139 |
{ |
140 |
ccs_control_array[CCS_VERBOSE].current_value = 0; |
141 |
return 0; |
142 |
} |
143 |
|
144 |
__setup("CCS_QUIET", ccs_quiet_setup); |
145 |
|
146 |
/** |
147 |
* ccs_io_printf - Transactional printf() to "struct ccs_io_buffer" structure. |
148 |
* |
149 |
* @head: Pointer to "struct ccs_io_buffer". |
150 |
* @fmt: The printf()'s format string, followed by parameters. |
151 |
* |
152 |
* Returns true on success, false otherwise. |
153 |
* |
154 |
* The snprintf() will truncate, but ccs_io_printf() won't. |
155 |
*/ |
156 |
bool ccs_io_printf(struct ccs_io_buffer *head, const char *fmt, ...) |
157 |
{ |
158 |
va_list args; |
159 |
int len; |
160 |
int pos = head->read_avail; |
161 |
int size = head->readbuf_size - pos; |
162 |
if (size <= 0) |
163 |
return false; |
164 |
va_start(args, fmt); |
165 |
len = vsnprintf(head->read_buf + pos, size, fmt, args); |
166 |
va_end(args); |
167 |
if (pos + len >= head->readbuf_size) |
168 |
return false; |
169 |
head->read_avail += len; |
170 |
return true; |
171 |
} |
172 |
|
173 |
/** |
174 |
* ccs_find_or_assign_new_profile - Create a new profile. |
175 |
* |
176 |
* @profile: Profile number to create. |
177 |
* |
178 |
* Returns pointer to "struct ccs_profile" on success, NULL otherwise. |
179 |
*/ |
180 |
static struct ccs_profile *ccs_find_or_assign_new_profile(const unsigned int |
181 |
profile) |
182 |
{ |
183 |
struct ccs_profile *ptr; |
184 |
struct ccs_profile *entry; |
185 |
int i; |
186 |
if (profile >= CCS_MAX_PROFILES) |
187 |
return NULL; |
188 |
ptr = ccs_profile_ptr[profile]; |
189 |
if (ptr) |
190 |
return ptr; |
191 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
192 |
mutex_lock(&ccs_policy_lock); |
193 |
ptr = ccs_profile_ptr[profile]; |
194 |
if (!ptr && ccs_memory_ok(entry, sizeof(*entry))) { |
195 |
ptr = entry; |
196 |
for (i = 0; i < CCS_MAX_CONTROL_INDEX; i++) |
197 |
ptr->value[i] = ccs_control_array[i].current_value; |
198 |
mb(); /* Avoid out-of-order execution. */ |
199 |
ccs_profile_ptr[profile] = ptr; |
200 |
entry = NULL; |
201 |
} |
202 |
mutex_unlock(&ccs_policy_lock); |
203 |
kfree(entry); |
204 |
return ptr; |
205 |
} |
206 |
|
207 |
/** |
208 |
* ccs_write_profile - Write profile table. |
209 |
* |
210 |
* @head: Pointer to "struct ccs_io_buffer". |
211 |
* |
212 |
* Returns 0 on success, negative value otherwise. |
213 |
*/ |
214 |
static int ccs_write_profile(struct ccs_io_buffer *head) |
215 |
{ |
216 |
char *data = head->write_buf; |
217 |
unsigned int i; |
218 |
unsigned int value; |
219 |
int index = -1; |
220 |
int mode; |
221 |
char *cp; |
222 |
struct ccs_profile *ccs_profile; |
223 |
i = simple_strtoul(data, &cp, 10); |
224 |
if (data != cp) { |
225 |
if (*cp != '-') |
226 |
return -EINVAL; |
227 |
data = cp + 1; |
228 |
} |
229 |
ccs_profile = ccs_find_or_assign_new_profile(i); |
230 |
if (!ccs_profile) |
231 |
return -EINVAL; |
232 |
cp = strchr(data, '='); |
233 |
if (!cp) |
234 |
return -EINVAL; |
235 |
*cp++ = '\0'; |
236 |
if (!strcmp(data, "COMMENT")) { |
237 |
const struct ccs_path_info *new_comment = ccs_get_name(cp); |
238 |
const struct ccs_path_info *old_comment; |
239 |
/* Protect reader from ccs_put_name(). */ |
240 |
/***** CRITICAL SECTION START *****/ |
241 |
spin_lock(&ccs_profile_comment_lock); |
242 |
old_comment = ccs_profile->comment; |
243 |
ccs_profile->comment = new_comment; |
244 |
spin_unlock(&ccs_profile_comment_lock); |
245 |
/***** CRITICAL SECTION END *****/ |
246 |
ccs_put_name(old_comment); |
247 |
return 0; |
248 |
} |
249 |
if (!ccs_str_starts(&data, "MAC::")) |
250 |
goto not_mac; |
251 |
if (ccs_str_starts(&data, CCS_KEYWORD_CAPABILITY)) |
252 |
for (i = 0; i < CCS_MAX_CAPABILITY_INDEX; i++) { |
253 |
if (strcmp(data, |
254 |
ccs_mac_keywords[CCS_MAX_MAC_INDEX + i])) |
255 |
continue; |
256 |
index = CCS_MAX_MAC_INDEX + i; |
257 |
break; |
258 |
} |
259 |
else |
260 |
for (i = 0; i < CCS_MAX_MAC_INDEX; i++) { |
261 |
if (strcmp(data, ccs_mac_keywords[i])) |
262 |
continue; |
263 |
index = i; |
264 |
break; |
265 |
} |
266 |
if (index < 0) |
267 |
return -EINVAL; |
268 |
ccs_mac_keywords_used[index] = 1; |
269 |
ccs_profile->no_grant_log[index] = !!strstr(cp, "no_grant_log"); |
270 |
ccs_profile->no_reject_log[index] = !!strstr(cp, "no_reject_log"); |
271 |
for (mode = 0; mode < 4; mode++) |
272 |
if (strstr(cp, ccs_mode_4[mode])) |
273 |
ccs_profile->mac_mode[index] = mode; |
274 |
return 0; |
275 |
not_mac: |
276 |
for (i = 0; i < CCS_MAX_CONTROL_INDEX; i++) { |
277 |
if (strcmp(data, ccs_control_array[i].keyword)) |
278 |
continue; |
279 |
if (sscanf(cp, "%u", &value) != 1) { |
280 |
int j; |
281 |
for (j = 0; j < 2; j++) { |
282 |
if (strcmp(cp, ccs_mode_2[j])) |
283 |
continue; |
284 |
value = j; |
285 |
break; |
286 |
} |
287 |
if (j == 2) |
288 |
return -EINVAL; |
289 |
} else if (value > ccs_control_array[i].max_value) { |
290 |
value = ccs_control_array[i].max_value; |
291 |
} |
292 |
ccs_profile->value[i] = value; |
293 |
return 0; |
294 |
} |
295 |
return -EINVAL; |
296 |
} |
297 |
|
298 |
static bool ccs_print_mac_mode(struct ccs_io_buffer *head, u8 index) |
299 |
{ |
300 |
const int pos = head->read_avail; |
301 |
int i; |
302 |
const struct ccs_profile *ccs_profile = ccs_profile_ptr[index]; |
303 |
for (i = 0; i < CCS_MAX_MAC_INDEX + CCS_MAX_CAPABILITY_INDEX; i++) { |
304 |
if (!ccs_mac_keywords_used[index]) |
305 |
continue; |
306 |
if (!ccs_io_printf(head, "%u-MAC::%s%s=%s %s %s\n", index, |
307 |
i >= CCS_MAX_MAC_INDEX ? |
308 |
CCS_KEYWORD_CAPABILITY : "", |
309 |
ccs_mac_keywords[i], |
310 |
ccs_mode_4[ccs_profile->mac_mode[i]], |
311 |
ccs_profile->no_grant_log[i] ? |
312 |
"no_grant_log" : "", |
313 |
ccs_profile->no_reject_log[i] ? |
314 |
"no_reject_log" : "")) |
315 |
goto out; |
316 |
} |
317 |
return true; |
318 |
out: |
319 |
head->read_avail = pos; |
320 |
return false; |
321 |
} |
322 |
|
323 |
/** |
324 |
* ccs_read_profile - Read profile table. |
325 |
* |
326 |
* @head: Pointer to "struct ccs_io_buffer". |
327 |
* |
328 |
* Returns 0. |
329 |
*/ |
330 |
static int ccs_read_profile(struct ccs_io_buffer *head) |
331 |
{ |
332 |
static const int ccs_total = CCS_MAX_CONTROL_INDEX + 2; |
333 |
int step; |
334 |
if (head->read_eof) |
335 |
return 0; |
336 |
for (step = head->read_step; step < CCS_MAX_PROFILES * ccs_total; |
337 |
step++) { |
338 |
const u8 index = step / ccs_total; |
339 |
u8 type = step % ccs_total; |
340 |
const struct ccs_profile *ccs_profile = ccs_profile_ptr[index]; |
341 |
head->read_step = step; |
342 |
if (!ccs_profile) |
343 |
continue; |
344 |
if (!type) { /* Print profile' comment tag. */ |
345 |
bool done; |
346 |
/***** CRITICAL SECTION START *****/ |
347 |
spin_lock(&ccs_profile_comment_lock); |
348 |
done = ccs_io_printf(head, "%u-COMMENT=%s\n", |
349 |
index, ccs_profile->comment ? |
350 |
ccs_profile->comment->name : ""); |
351 |
spin_unlock(&ccs_profile_comment_lock); |
352 |
/***** CRITICAL SECTION END *****/ |
353 |
if (!done) |
354 |
break; |
355 |
continue; |
356 |
} else if (type == 1) { |
357 |
if (!ccs_print_mac_mode(head, index)) |
358 |
break; |
359 |
continue; |
360 |
} |
361 |
type -= 2; |
362 |
{ |
363 |
const unsigned int value = ccs_profile->value[type]; |
364 |
const char *keyword = ccs_control_array[type].keyword; |
365 |
if (ccs_control_array[type].max_value == 1) { |
366 |
if (!ccs_io_printf(head, "%u-%s=%s\n", index, |
367 |
keyword, ccs_mode_2[value])) |
368 |
break; |
369 |
} else { |
370 |
if (!ccs_io_printf(head, "%u-%s=%u\n", index, |
371 |
keyword, value)) |
372 |
break; |
373 |
} |
374 |
} |
375 |
} |
376 |
if (step == CCS_MAX_PROFILES * ccs_total) |
377 |
head->read_eof = true; |
378 |
return 0; |
379 |
} |
380 |
|
381 |
/* The list for "struct ccs_policy_manager_entry". */ |
382 |
LIST_HEAD(ccs_policy_manager_list); |
383 |
|
384 |
/** |
385 |
* ccs_update_manager_entry - Add a manager entry. |
386 |
* |
387 |
* @manager: The path to manager or the domainnamme. |
388 |
* @is_delete: True if it is a delete request. |
389 |
* |
390 |
* Returns 0 on success, negative value otherwise. |
391 |
*/ |
392 |
static int ccs_update_manager_entry(const char *manager, const bool is_delete) |
393 |
{ |
394 |
struct ccs_policy_manager_entry *entry = NULL; |
395 |
struct ccs_policy_manager_entry *ptr; |
396 |
struct ccs_policy_manager_entry e = { }; |
397 |
int error = is_delete ? -ENOENT : -ENOMEM; |
398 |
if (ccs_is_domain_def(manager)) { |
399 |
if (!ccs_is_correct_domain(manager)) |
400 |
return -EINVAL; |
401 |
e.is_domain = true; |
402 |
} else { |
403 |
if (!ccs_is_correct_path(manager, 1, -1, -1)) |
404 |
return -EINVAL; |
405 |
} |
406 |
e.manager = ccs_get_name(manager); |
407 |
if (!e.manager) |
408 |
return -ENOMEM; |
409 |
if (!is_delete) |
410 |
entry = kmalloc(sizeof(e), GFP_KERNEL); |
411 |
mutex_lock(&ccs_policy_lock); |
412 |
list_for_each_entry_rcu(ptr, &ccs_policy_manager_list, list) { |
413 |
if (ptr->manager != e.manager) |
414 |
continue; |
415 |
ptr->is_deleted = is_delete; |
416 |
error = 0; |
417 |
break; |
418 |
} |
419 |
if (!is_delete && error && ccs_commit_ok(entry, &e, sizeof(e))) { |
420 |
list_add_tail_rcu(&entry->list, &ccs_policy_manager_list); |
421 |
entry = NULL; |
422 |
error = 0; |
423 |
} |
424 |
mutex_unlock(&ccs_policy_lock); |
425 |
ccs_put_name(e.manager); |
426 |
kfree(entry); |
427 |
return error; |
428 |
} |
429 |
|
430 |
/** |
431 |
* ccs_write_manager_policy - Write manager policy. |
432 |
* |
433 |
* @head: Pointer to "struct ccs_io_buffer". |
434 |
* |
435 |
* Returns 0 on success, negative value otherwise. |
436 |
*/ |
437 |
static int ccs_write_manager_policy(struct ccs_io_buffer *head) |
438 |
{ |
439 |
char *data = head->write_buf; |
440 |
bool is_delete = ccs_str_starts(&data, CCS_KEYWORD_DELETE); |
441 |
if (!strcmp(data, "manage_by_non_root")) { |
442 |
ccs_manage_by_non_root = !is_delete; |
443 |
return 0; |
444 |
} |
445 |
return ccs_update_manager_entry(data, is_delete); |
446 |
} |
447 |
|
448 |
/** |
449 |
* ccs_read_manager_policy - Read manager policy. |
450 |
* |
451 |
* @head: Pointer to "struct ccs_io_buffer". |
452 |
* |
453 |
* Returns 0. |
454 |
* |
455 |
* Caller holds ccs_read_lock(). |
456 |
*/ |
457 |
static int ccs_read_manager_policy(struct ccs_io_buffer *head) |
458 |
{ |
459 |
struct list_head *pos; |
460 |
ccs_assert_read_lock(); |
461 |
if (head->read_eof) |
462 |
return 0; |
463 |
list_for_each_cookie(pos, head->read_var2, &ccs_policy_manager_list) { |
464 |
struct ccs_policy_manager_entry *ptr; |
465 |
ptr = list_entry(pos, struct ccs_policy_manager_entry, list); |
466 |
if (ptr->is_deleted) |
467 |
continue; |
468 |
if (!ccs_io_printf(head, "%s\n", ptr->manager->name)) |
469 |
return 0; |
470 |
} |
471 |
head->read_eof = true; |
472 |
return 0; |
473 |
} |
474 |
|
475 |
/** |
476 |
* ccs_is_policy_manager - Check whether the current process is a policy manager. |
477 |
* |
478 |
* Returns true if the current process is permitted to modify policy |
479 |
* via /proc/ccs/ interface. |
480 |
* |
481 |
* Caller holds ccs_read_lock(). |
482 |
*/ |
483 |
static bool ccs_is_policy_manager(void) |
484 |
{ |
485 |
struct ccs_policy_manager_entry *ptr; |
486 |
const char *exe; |
487 |
struct task_struct *task = current; |
488 |
const struct ccs_path_info *domainname |
489 |
= ccs_current_domain()->domainname; |
490 |
bool found = false; |
491 |
ccs_assert_read_lock(); |
492 |
if (!ccs_policy_loaded) |
493 |
return true; |
494 |
if (task->ccs_flags & CCS_TASK_IS_POLICY_MANAGER) |
495 |
return true; |
496 |
if (!ccs_manage_by_non_root && (current_uid() || current_euid())) |
497 |
return false; |
498 |
list_for_each_entry_rcu(ptr, &ccs_policy_manager_list, list) { |
499 |
if (!ptr->is_deleted && ptr->is_domain |
500 |
&& !ccs_pathcmp(domainname, ptr->manager)) { |
501 |
/* Set manager flag. */ |
502 |
task->ccs_flags |= CCS_TASK_IS_POLICY_MANAGER; |
503 |
return true; |
504 |
} |
505 |
} |
506 |
exe = ccs_get_exe(); |
507 |
if (!exe) |
508 |
return false; |
509 |
list_for_each_entry_rcu(ptr, &ccs_policy_manager_list, list) { |
510 |
if (!ptr->is_deleted && !ptr->is_domain |
511 |
&& !strcmp(exe, ptr->manager->name)) { |
512 |
found = true; |
513 |
/* Set manager flag. */ |
514 |
task->ccs_flags |= CCS_TASK_IS_POLICY_MANAGER; |
515 |
break; |
516 |
} |
517 |
} |
518 |
if (!found) { /* Reduce error messages. */ |
519 |
static pid_t ccs_last_pid; |
520 |
const pid_t pid = current->pid; |
521 |
if (ccs_last_pid != pid) { |
522 |
printk(KERN_WARNING "%s ( %s ) is not permitted to " |
523 |
"update policies.\n", domainname->name, exe); |
524 |
ccs_last_pid = pid; |
525 |
} |
526 |
} |
527 |
kfree(exe); |
528 |
return found; |
529 |
} |
530 |
|
531 |
/** |
532 |
* ccs_find_condition_part - Find condition part from the statement. |
533 |
* |
534 |
* @data: String to parse. |
535 |
* |
536 |
* Returns pointer to the condition part if it was found in the statement, |
537 |
* NULL otherwise. |
538 |
*/ |
539 |
static char *ccs_find_condition_part(char *data) |
540 |
{ |
541 |
char *cp = strstr(data, " if "); |
542 |
if (cp) { |
543 |
while (1) { |
544 |
char *cp2 = strstr(cp + 3, " if "); |
545 |
if (!cp2) |
546 |
break; |
547 |
cp = cp2; |
548 |
} |
549 |
*cp++ = '\0'; |
550 |
} else { |
551 |
cp = strstr(data, " ; set "); |
552 |
if (cp) |
553 |
*cp++ = '\0'; |
554 |
} |
555 |
return cp; |
556 |
} |
557 |
|
558 |
/** |
559 |
* ccs_is_select_one - Parse select command. |
560 |
* |
561 |
* @head: Pointer to "struct ccs_io_buffer". |
562 |
* @data: String to parse. |
563 |
* |
564 |
* Returns true on success, false otherwise. |
565 |
* |
566 |
* Caller holds ccs_read_lock(). |
567 |
*/ |
568 |
static bool ccs_is_select_one(struct ccs_io_buffer *head, const char *data) |
569 |
{ |
570 |
unsigned int pid; |
571 |
struct ccs_domain_info *domain = NULL; |
572 |
ccs_assert_read_lock(); |
573 |
if (!strcmp(data, "allow_execute")) { |
574 |
head->read_execute_only = true; |
575 |
return true; |
576 |
} |
577 |
if (sscanf(data, "pid=%u", &pid) == 1) { |
578 |
struct task_struct *p; |
579 |
/***** CRITICAL SECTION START *****/ |
580 |
read_lock(&tasklist_lock); |
581 |
p = find_task_by_pid(pid); |
582 |
if (p) |
583 |
domain = ccs_task_domain(p); |
584 |
read_unlock(&tasklist_lock); |
585 |
/***** CRITICAL SECTION END *****/ |
586 |
} else if (!strncmp(data, "domain=", 7)) { |
587 |
if (ccs_is_domain_def(data + 7)) |
588 |
domain = ccs_find_domain(data + 7); |
589 |
} else |
590 |
return false; |
591 |
head->write_var1 = domain; |
592 |
/* Accessing read_buf is safe because head->io_sem is held. */ |
593 |
if (!head->read_buf) |
594 |
return true; /* Do nothing if open(O_WRONLY). */ |
595 |
head->read_avail = 0; |
596 |
ccs_io_printf(head, "# select %s\n", data); |
597 |
head->read_single_domain = true; |
598 |
head->read_eof = !domain; |
599 |
if (domain) { |
600 |
struct ccs_domain_info *d; |
601 |
head->read_var1 = NULL; |
602 |
list_for_each_entry_rcu(d, &ccs_domain_list, list) { |
603 |
if (d == domain) |
604 |
break; |
605 |
head->read_var1 = &d->list; |
606 |
} |
607 |
head->read_var2 = NULL; |
608 |
head->read_bit = 0; |
609 |
head->read_step = 0; |
610 |
if (domain->is_deleted) |
611 |
ccs_io_printf(head, "# This is a deleted domain.\n"); |
612 |
} |
613 |
return true; |
614 |
} |
615 |
|
616 |
static int ccs_write_domain_policy2(char *data, struct ccs_domain_info *domain, |
617 |
struct ccs_condition *cond, |
618 |
const bool is_delete) |
619 |
{ |
620 |
if (ccs_str_starts(&data, CCS_KEYWORD_ALLOW_CAPABILITY)) |
621 |
return ccs_write_capability_policy(data, domain, cond, |
622 |
is_delete); |
623 |
if (ccs_str_starts(&data, CCS_KEYWORD_ALLOW_NETWORK)) |
624 |
return ccs_write_network_policy(data, domain, cond, is_delete); |
625 |
if (ccs_str_starts(&data, CCS_KEYWORD_ALLOW_SIGNAL)) |
626 |
return ccs_write_signal_policy(data, domain, cond, is_delete); |
627 |
if (ccs_str_starts(&data, CCS_KEYWORD_ALLOW_ENV)) |
628 |
return ccs_write_env_policy(data, domain, cond, is_delete); |
629 |
if (ccs_str_starts(&data, CCS_KEYWORD_ALLOW_MOUNT)) |
630 |
return ccs_write_mount_policy(data, domain, cond, is_delete); |
631 |
if (ccs_str_starts(&data, CCS_KEYWORD_ALLOW_UNMOUNT)) |
632 |
return ccs_write_umount_policy(data, domain, cond, is_delete); |
633 |
if (ccs_str_starts(&data, CCS_KEYWORD_ALLOW_CHROOT)) |
634 |
return ccs_write_chroot_policy(data, domain, cond, is_delete); |
635 |
if (ccs_str_starts(&data, CCS_KEYWORD_ALLOW_PIVOT_ROOT)) |
636 |
return ccs_write_pivot_root_policy(data, domain, cond, |
637 |
is_delete); |
638 |
return ccs_write_file_policy(data, domain, cond, is_delete); |
639 |
} |
640 |
|
641 |
/** |
642 |
* ccs_write_domain_policy - Write domain policy. |
643 |
* |
644 |
* @head: Pointer to "struct ccs_io_buffer". |
645 |
* |
646 |
* Returns 0 on success, negative value otherwise. |
647 |
*/ |
648 |
static int ccs_write_domain_policy(struct ccs_io_buffer *head) |
649 |
{ |
650 |
char *data = head->write_buf; |
651 |
struct ccs_domain_info *domain = head->write_var1; |
652 |
bool is_delete = false; |
653 |
bool is_select = false; |
654 |
unsigned int profile; |
655 |
struct ccs_condition *cond = NULL; |
656 |
char *cp; |
657 |
int error; |
658 |
if (ccs_str_starts(&data, CCS_KEYWORD_DELETE)) |
659 |
is_delete = true; |
660 |
else if (ccs_str_starts(&data, CCS_KEYWORD_SELECT)) |
661 |
is_select = true; |
662 |
if (is_select && ccs_is_select_one(head, data)) |
663 |
return 0; |
664 |
/* Don't allow updating policies by non manager programs. */ |
665 |
if (!ccs_is_policy_manager()) |
666 |
return -EPERM; |
667 |
if (ccs_is_domain_def(data)) { |
668 |
domain = NULL; |
669 |
if (is_delete) |
670 |
ccs_delete_domain(data); |
671 |
else if (is_select) |
672 |
domain = ccs_find_domain(data); |
673 |
else |
674 |
domain = ccs_find_or_assign_new_domain(data, 0); |
675 |
head->write_var1 = domain; |
676 |
return 0; |
677 |
} |
678 |
if (!domain) |
679 |
return -EINVAL; |
680 |
|
681 |
if (sscanf(data, CCS_KEYWORD_USE_PROFILE "%u", &profile) == 1 |
682 |
&& profile < CCS_MAX_PROFILES) { |
683 |
if (ccs_profile_ptr[profile] || !ccs_policy_loaded) |
684 |
domain->profile = (u8) profile; |
685 |
return 0; |
686 |
} |
687 |
if (!strcmp(data, CCS_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { |
688 |
domain->ignore_global_allow_read = !is_delete; |
689 |
return 0; |
690 |
} |
691 |
if (!strcmp(data, CCS_KEYWORD_IGNORE_GLOBAL_ALLOW_ENV)) { |
692 |
domain->ignore_global_allow_env = !is_delete; |
693 |
return 0; |
694 |
} |
695 |
cp = ccs_find_condition_part(data); |
696 |
if (cp) { |
697 |
cond = ccs_get_condition(cp); |
698 |
if (!cond) |
699 |
return -EINVAL; |
700 |
} |
701 |
error = ccs_write_domain_policy2(data, domain, cond, is_delete); |
702 |
if (cond) |
703 |
ccs_put_condition(cond); |
704 |
return error; |
705 |
} |
706 |
|
707 |
static bool ccs_print_name_union(struct ccs_io_buffer *head, |
708 |
const struct ccs_name_union *ptr) |
709 |
{ |
710 |
int pos = head->read_avail; |
711 |
if (pos && head->read_buf[pos - 1] == ' ') |
712 |
head->read_avail--; |
713 |
if (ptr->is_group) |
714 |
return ccs_io_printf(head, " @%s", |
715 |
ptr->group->group_name->name); |
716 |
return ccs_io_printf(head, " %s", ptr->filename->name); |
717 |
} |
718 |
|
719 |
static bool ccs_print_name_union_quoted(struct ccs_io_buffer *head, |
720 |
const struct ccs_name_union *ptr) |
721 |
{ |
722 |
if (ptr->is_group) |
723 |
return ccs_io_printf(head, "@%s", |
724 |
ptr->group->group_name->name); |
725 |
return ccs_io_printf(head, "\"%s\"", ptr->filename->name); |
726 |
} |
727 |
|
728 |
static bool ccs_print_number_union_common(struct ccs_io_buffer *head, |
729 |
const struct ccs_number_union *ptr, |
730 |
const bool need_space) |
731 |
{ |
732 |
unsigned long min; |
733 |
unsigned long max; |
734 |
u8 min_type; |
735 |
u8 max_type; |
736 |
if (need_space && !ccs_io_printf(head, " ")) |
737 |
return false; |
738 |
if (ptr->is_group) |
739 |
return ccs_io_printf(head, "@%s", |
740 |
ptr->group->group_name->name); |
741 |
min_type = ptr->min_type; |
742 |
max_type = ptr->max_type; |
743 |
min = ptr->values[0]; |
744 |
max = ptr->values[1]; |
745 |
switch (min_type) { |
746 |
case CCS_VALUE_TYPE_HEXADECIMAL: |
747 |
if (!ccs_io_printf(head, "0x%lX", min)) |
748 |
return false; |
749 |
break; |
750 |
case CCS_VALUE_TYPE_OCTAL: |
751 |
if (!ccs_io_printf(head, "0%lo", min)) |
752 |
return false; |
753 |
break; |
754 |
default: |
755 |
if (!ccs_io_printf(head, "%lu", min)) |
756 |
return false; |
757 |
break; |
758 |
} |
759 |
if (min == max && min_type == max_type) |
760 |
return true; |
761 |
switch (max_type) { |
762 |
case CCS_VALUE_TYPE_HEXADECIMAL: |
763 |
return ccs_io_printf(head, "-0x%lX", max); |
764 |
case CCS_VALUE_TYPE_OCTAL: |
765 |
return ccs_io_printf(head, "-0%lo", max); |
766 |
default: |
767 |
return ccs_io_printf(head, "-%lu", max); |
768 |
} |
769 |
} |
770 |
|
771 |
bool ccs_print_number_union(struct ccs_io_buffer *head, |
772 |
const struct ccs_number_union *ptr) |
773 |
{ |
774 |
return ccs_print_number_union_common(head, ptr, true); |
775 |
} |
776 |
|
777 |
static bool ccs_print_number_union_nospace(struct ccs_io_buffer *head, |
778 |
const struct ccs_number_union *ptr) |
779 |
{ |
780 |
return ccs_print_number_union_common(head, ptr, false); |
781 |
} |
782 |
|
783 |
/** |
784 |
* ccs_print_condition - Print condition part. |
785 |
* |
786 |
* @head: Pointer to "struct ccs_io_buffer". |
787 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
788 |
* |
789 |
* Returns true on success, false otherwise. |
790 |
*/ |
791 |
static bool ccs_print_condition(struct ccs_io_buffer *head, |
792 |
const struct ccs_condition *cond) |
793 |
{ |
794 |
const struct ccs_condition_element *condp; |
795 |
const struct ccs_number_union *numbers_p; |
796 |
const struct ccs_name_union *names_p; |
797 |
const struct ccs_argv_entry *argv; |
798 |
const struct ccs_envp_entry *envp; |
799 |
u16 condc; |
800 |
u16 i; |
801 |
u16 j; |
802 |
char buffer[32]; |
803 |
if (!cond) |
804 |
goto no_condition; |
805 |
condc = cond->condc; |
806 |
condp = (const struct ccs_condition_element *) (cond + 1); |
807 |
numbers_p = (const struct ccs_number_union *) (condp + condc); |
808 |
names_p = (const struct ccs_name_union *) |
809 |
(numbers_p + cond->numbers_count); |
810 |
argv = (const struct ccs_argv_entry *) (names_p + cond->names_count); |
811 |
envp = (const struct ccs_envp_entry *) (argv + cond->argc); |
812 |
memset(buffer, 0, sizeof(buffer)); |
813 |
if (condc && !ccs_io_printf(head, "%s", " if")) |
814 |
goto out; |
815 |
for (i = 0; i < condc; i++) { |
816 |
const u8 match = condp->equals; |
817 |
const u8 left = condp->left; |
818 |
const u8 right = condp->right; |
819 |
condp++; |
820 |
switch (left) { |
821 |
case CCS_ARGV_ENTRY: |
822 |
if (!ccs_io_printf(head, " exec.argv[%u]%s\"%s\"", |
823 |
argv->index, argv->is_not ? |
824 |
"!=" : "=", argv->value->name)) |
825 |
goto out; |
826 |
argv++; |
827 |
continue; |
828 |
case CCS_ENVP_ENTRY: |
829 |
if (!ccs_io_printf(head, " exec.envp[\"%s\"]%s", |
830 |
envp->name->name, envp->is_not ? |
831 |
"!=" : "=")) |
832 |
goto out; |
833 |
if (envp->value) { |
834 |
if (!ccs_io_printf(head, "\"%s\"", |
835 |
envp->value->name)) |
836 |
goto out; |
837 |
} else { |
838 |
if (!ccs_io_printf(head, "NULL")) |
839 |
goto out; |
840 |
} |
841 |
envp++; |
842 |
continue; |
843 |
case CCS_NUMBER_UNION: |
844 |
if (!ccs_print_number_union(head, numbers_p++)) |
845 |
goto out; |
846 |
break; |
847 |
default: |
848 |
if (left >= CCS_MAX_CONDITION_KEYWORD) |
849 |
goto out; |
850 |
if (!ccs_io_printf(head, " %s", |
851 |
ccs_condition_keyword[left])) |
852 |
goto out; |
853 |
break; |
854 |
} |
855 |
if (!ccs_io_printf(head, "%s", match ? "=" : "!=")) |
856 |
goto out; |
857 |
switch (right) { |
858 |
case CCS_NAME_UNION: |
859 |
if (!ccs_print_name_union_quoted(head, names_p++)) |
860 |
goto out; |
861 |
break; |
862 |
case CCS_NUMBER_UNION: |
863 |
if (!ccs_print_number_union_nospace(head, numbers_p++)) |
864 |
goto out; |
865 |
break; |
866 |
default: |
867 |
if (right >= CCS_MAX_CONDITION_KEYWORD) |
868 |
goto out; |
869 |
if (!ccs_io_printf(head, "%s", |
870 |
ccs_condition_keyword[right])) |
871 |
goto out; |
872 |
break; |
873 |
} |
874 |
} |
875 |
i = cond->post_state[3]; |
876 |
if (!i) |
877 |
goto no_condition; |
878 |
if (!ccs_io_printf(head, " ; set")) |
879 |
goto out; |
880 |
for (j = 0; j < 3; j++) { |
881 |
if (!(i & (1 << j))) |
882 |
continue; |
883 |
if (!ccs_io_printf(head, " task.state[%u]=%u", j, |
884 |
cond->post_state[j])) |
885 |
goto out; |
886 |
} |
887 |
no_condition: |
888 |
if (ccs_io_printf(head, "\n")) |
889 |
return true; |
890 |
out: |
891 |
return false; |
892 |
} |
893 |
|
894 |
/** |
895 |
* ccs_print_path_acl - Print a single path ACL entry. |
896 |
* |
897 |
* @head: Pointer to "struct ccs_io_buffer". |
898 |
* @ptr: Pointer to "struct ccs_path_acl". |
899 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
900 |
* |
901 |
* Returns true on success, false otherwise. |
902 |
*/ |
903 |
static bool ccs_print_path_acl(struct ccs_io_buffer *head, |
904 |
struct ccs_path_acl *ptr, |
905 |
const struct ccs_condition *cond) |
906 |
{ |
907 |
int pos; |
908 |
u8 bit; |
909 |
const u16 perm = ptr->perm; |
910 |
for (bit = head->read_bit; bit < CCS_MAX_PATH_OPERATION; bit++) { |
911 |
if (!(perm & (1 << bit))) |
912 |
continue; |
913 |
if (head->read_execute_only && bit != CCS_TYPE_EXECUTE) |
914 |
continue; |
915 |
/* Print "read/write" instead of "read" and "write". */ |
916 |
if ((bit == CCS_TYPE_READ || bit == CCS_TYPE_WRITE) |
917 |
&& (perm & (1 << CCS_TYPE_READ_WRITE))) |
918 |
continue; |
919 |
pos = head->read_avail; |
920 |
if (!ccs_io_printf(head, "allow_%s", ccs_path2keyword(bit)) || |
921 |
!ccs_print_name_union(head, &ptr->name) || |
922 |
!ccs_print_condition(head, cond)) { |
923 |
head->read_bit = bit; |
924 |
head->read_avail = pos; |
925 |
return false; |
926 |
} |
927 |
} |
928 |
head->read_bit = 0; |
929 |
return true; |
930 |
} |
931 |
|
932 |
/** |
933 |
* ccs_print_path_number3_acl - Print a path_number3 ACL entry. |
934 |
* |
935 |
* @head: Pointer to "struct ccs_io_buffer". |
936 |
* @ptr: Pointer to "struct ccs_path_number3_acl". |
937 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
938 |
* |
939 |
* Returns true on success, false otherwise. |
940 |
*/ |
941 |
static bool ccs_print_path_number3_acl(struct ccs_io_buffer *head, |
942 |
struct ccs_path_number3_acl *ptr, |
943 |
const struct ccs_condition *cond) |
944 |
{ |
945 |
int pos; |
946 |
u8 bit; |
947 |
const u16 perm = ptr->perm; |
948 |
for (bit = head->read_bit; bit < CCS_MAX_PATH_NUMBER3_OPERATION; |
949 |
bit++) { |
950 |
if (!(perm & (1 << bit))) |
951 |
continue; |
952 |
pos = head->read_avail; |
953 |
if (!ccs_io_printf(head, "allow_%s", |
954 |
ccs_path_number32keyword(bit)) || |
955 |
!ccs_print_name_union(head, &ptr->name) || |
956 |
!ccs_print_number_union(head, &ptr->mode) || |
957 |
!ccs_print_number_union(head, &ptr->major) || |
958 |
!ccs_print_number_union(head, &ptr->minor) || |
959 |
!ccs_print_condition(head, cond)) { |
960 |
head->read_bit = bit; |
961 |
head->read_avail = pos; |
962 |
return false; |
963 |
} |
964 |
} |
965 |
head->read_bit = 0; |
966 |
return true; |
967 |
} |
968 |
|
969 |
/** |
970 |
* ccs_print_path2_acl - Print a double path ACL entry. |
971 |
* |
972 |
* @head: Pointer to "struct ccs_io_buffer". |
973 |
* @ptr: Pointer to "struct ccs_path2_acl". |
974 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
975 |
* |
976 |
* Returns true on success, false otherwise. |
977 |
*/ |
978 |
static bool ccs_print_path2_acl(struct ccs_io_buffer *head, |
979 |
struct ccs_path2_acl *ptr, |
980 |
const struct ccs_condition *cond) |
981 |
{ |
982 |
int pos; |
983 |
u8 bit; |
984 |
const u8 perm = ptr->perm; |
985 |
for (bit = head->read_bit; bit < CCS_MAX_PATH2_OPERATION; bit++) { |
986 |
if (!(perm & (1 << bit))) |
987 |
continue; |
988 |
pos = head->read_avail; |
989 |
if (!ccs_io_printf(head, "allow_%s", |
990 |
ccs_path22keyword(bit)) || |
991 |
!ccs_print_name_union(head, &ptr->name1) || |
992 |
!ccs_print_name_union(head, &ptr->name2) || |
993 |
!ccs_print_condition(head, cond)) { |
994 |
head->read_bit = bit; |
995 |
head->read_avail = pos; |
996 |
return false; |
997 |
} |
998 |
} |
999 |
head->read_bit = 0; |
1000 |
return true; |
1001 |
} |
1002 |
|
1003 |
/** |
1004 |
* ccs_print_path_number_acl - Print an ioctl/chmod/chown/chgrp ACL entry. |
1005 |
* |
1006 |
* @head: Pointer to "struct ccs_io_buffer". |
1007 |
* @ptr: Pointer to "struct ccs_path_number_acl". |
1008 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
1009 |
* |
1010 |
* Returns true on success, false otherwise. |
1011 |
*/ |
1012 |
static bool ccs_print_path_number_acl(struct ccs_io_buffer *head, |
1013 |
struct ccs_path_number_acl *ptr, |
1014 |
const struct ccs_condition *cond) |
1015 |
{ |
1016 |
int pos; |
1017 |
u8 bit; |
1018 |
const u8 perm = ptr->perm; |
1019 |
for (bit = head->read_bit; bit < CCS_MAX_PATH_NUMBER_OPERATION; |
1020 |
bit++) { |
1021 |
if (!(perm & (1 << bit))) |
1022 |
continue; |
1023 |
pos = head->read_avail; |
1024 |
if (!ccs_io_printf(head, "allow_%s", |
1025 |
ccs_path_number2keyword(bit)) || |
1026 |
!ccs_print_name_union(head, &ptr->name) || |
1027 |
!ccs_print_number_union(head, &ptr->number) || |
1028 |
!ccs_print_condition(head, cond)) { |
1029 |
head->read_bit = bit; |
1030 |
head->read_avail = pos; |
1031 |
return false; |
1032 |
} |
1033 |
} |
1034 |
head->read_bit = 0; |
1035 |
return true; |
1036 |
} |
1037 |
|
1038 |
/** |
1039 |
* ccs_print_env_acl - Print an evironment variable name's ACL entry. |
1040 |
* |
1041 |
* @head: Pointer to "struct ccs_io_buffer". |
1042 |
* @ptr: Pointer to "struct ccs_env_acl". |
1043 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
1044 |
* |
1045 |
* Returns true on success, false otherwise. |
1046 |
*/ |
1047 |
static bool ccs_print_env_acl(struct ccs_io_buffer *head, |
1048 |
struct ccs_env_acl *ptr, |
1049 |
const struct ccs_condition *cond) |
1050 |
{ |
1051 |
const int pos = head->read_avail; |
1052 |
if (!ccs_io_printf(head, CCS_KEYWORD_ALLOW_ENV "%s", ptr->env->name) || |
1053 |
!ccs_print_condition(head, cond)) { |
1054 |
head->read_avail = pos; |
1055 |
return false; |
1056 |
} |
1057 |
return true; |
1058 |
} |
1059 |
|
1060 |
/** |
1061 |
* ccs_print_capability_acl - Print a capability ACL entry. |
1062 |
* |
1063 |
* @head: Pointer to "struct ccs_io_buffer". |
1064 |
* @ptr: Pointer to "struct ccs_capability_acl". |
1065 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
1066 |
* |
1067 |
* Returns true on success, false otherwise. |
1068 |
*/ |
1069 |
static bool ccs_print_capability_acl(struct ccs_io_buffer *head, |
1070 |
struct ccs_capability_acl *ptr, |
1071 |
const struct ccs_condition *cond) |
1072 |
{ |
1073 |
const int pos = head->read_avail; |
1074 |
if (!ccs_io_printf(head, CCS_KEYWORD_ALLOW_CAPABILITY "%s", |
1075 |
ccs_cap2keyword(ptr->operation)) || |
1076 |
!ccs_print_condition(head, cond)) { |
1077 |
head->read_avail = pos; |
1078 |
return false; |
1079 |
} |
1080 |
return true; |
1081 |
} |
1082 |
|
1083 |
/** |
1084 |
* ccs_print_ipv4_entry - Print IPv4 address of a network ACL entry. |
1085 |
* |
1086 |
* @head: Pointer to "struct ccs_io_buffer". |
1087 |
* @ptr: Pointer to "struct ccs_ip_network_acl". |
1088 |
* |
1089 |
* Returns true on success, false otherwise. |
1090 |
*/ |
1091 |
static bool ccs_print_ipv4_entry(struct ccs_io_buffer *head, |
1092 |
struct ccs_ip_network_acl *ptr) |
1093 |
{ |
1094 |
const u32 min_address = ptr->address.ipv4.min; |
1095 |
const u32 max_address = ptr->address.ipv4.max; |
1096 |
if (!ccs_io_printf(head, "%u.%u.%u.%u", HIPQUAD(min_address))) |
1097 |
return false; |
1098 |
if (min_address != max_address |
1099 |
&& !ccs_io_printf(head, "-%u.%u.%u.%u", HIPQUAD(max_address))) |
1100 |
return false; |
1101 |
return true; |
1102 |
} |
1103 |
|
1104 |
/** |
1105 |
* ccs_print_ipv6_entry - Print IPv6 address of a network ACL entry. |
1106 |
* |
1107 |
* @head: Pointer to "struct ccs_io_buffer". |
1108 |
* @ptr: Pointer to "struct ccs_ip_network_acl". |
1109 |
* |
1110 |
* Returns true on success, false otherwise. |
1111 |
*/ |
1112 |
static bool ccs_print_ipv6_entry(struct ccs_io_buffer *head, |
1113 |
struct ccs_ip_network_acl *ptr) |
1114 |
{ |
1115 |
char buf[64]; |
1116 |
const struct in6_addr *min_address = ptr->address.ipv6.min; |
1117 |
const struct in6_addr *max_address = ptr->address.ipv6.max; |
1118 |
ccs_print_ipv6(buf, sizeof(buf), min_address); |
1119 |
if (!ccs_io_printf(head, "%s", buf)) |
1120 |
return false; |
1121 |
if (min_address != max_address) { |
1122 |
ccs_print_ipv6(buf, sizeof(buf), max_address); |
1123 |
if (!ccs_io_printf(head, "-%s", buf)) |
1124 |
return false; |
1125 |
} |
1126 |
return true; |
1127 |
} |
1128 |
|
1129 |
/** |
1130 |
* ccs_print_network_acl - Print a network ACL entry. |
1131 |
* |
1132 |
* @head: Pointer to "struct ccs_io_buffer". |
1133 |
* @ptr: Pointer to "struct ccs_ip_network_acl". |
1134 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
1135 |
* |
1136 |
* Returns true on success, false otherwise. |
1137 |
*/ |
1138 |
static bool ccs_print_network_acl(struct ccs_io_buffer *head, |
1139 |
struct ccs_ip_network_acl *ptr, |
1140 |
const struct ccs_condition *cond) |
1141 |
{ |
1142 |
int pos; |
1143 |
u8 bit; |
1144 |
const u16 perm = ptr->perm; |
1145 |
for (bit = head->read_bit; bit < CCS_MAX_NETWORK_OPERATION; bit++) { |
1146 |
if (!(perm & (1 << bit))) |
1147 |
continue; |
1148 |
pos = head->read_avail; |
1149 |
if (!ccs_io_printf(head, CCS_KEYWORD_ALLOW_NETWORK "%s ", |
1150 |
ccs_net2keyword(bit))) |
1151 |
goto out; |
1152 |
switch (ptr->address_type) { |
1153 |
case CCS_IP_ADDRESS_TYPE_ADDRESS_GROUP: |
1154 |
if (!ccs_io_printf(head, "@%s", ptr->address.group-> |
1155 |
group_name->name)) |
1156 |
goto out; |
1157 |
break; |
1158 |
case CCS_IP_ADDRESS_TYPE_IPv4: |
1159 |
if (!ccs_print_ipv4_entry(head, ptr)) |
1160 |
goto out; |
1161 |
break; |
1162 |
case CCS_IP_ADDRESS_TYPE_IPv6: |
1163 |
if (!ccs_print_ipv6_entry(head, ptr)) |
1164 |
goto out; |
1165 |
break; |
1166 |
} |
1167 |
if (!ccs_print_number_union(head, &ptr->port) || |
1168 |
!ccs_print_condition(head, cond)) |
1169 |
goto out; |
1170 |
} |
1171 |
head->read_bit = 0; |
1172 |
return true; |
1173 |
out: |
1174 |
head->read_bit = bit; |
1175 |
head->read_avail = pos; |
1176 |
return false; |
1177 |
} |
1178 |
|
1179 |
/** |
1180 |
* ccs_print_signal_acl - Print a signal ACL entry. |
1181 |
* |
1182 |
* @head: Pointer to "struct ccs_io_buffer". |
1183 |
* @ptr: Pointer to "struct signale_acl". |
1184 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
1185 |
* |
1186 |
* Returns true on success, false otherwise. |
1187 |
*/ |
1188 |
static bool ccs_print_signal_acl(struct ccs_io_buffer *head, |
1189 |
struct ccs_signal_acl *ptr, |
1190 |
const struct ccs_condition *cond) |
1191 |
{ |
1192 |
const int pos = head->read_avail; |
1193 |
if (!ccs_io_printf(head, CCS_KEYWORD_ALLOW_SIGNAL "%u %s", |
1194 |
ptr->sig, ptr->domainname->name) || |
1195 |
!ccs_print_condition(head, cond)) { |
1196 |
head->read_avail = pos; |
1197 |
return false; |
1198 |
} |
1199 |
return true; |
1200 |
} |
1201 |
|
1202 |
/** |
1203 |
* ccs_print_execute_handler_record - Print an execute handler ACL entry. |
1204 |
* |
1205 |
* @head: Pointer to "struct ccs_io_buffer". |
1206 |
* @keyword: Name of the keyword. |
1207 |
* @ptr: Pointer to "struct ccs_execute_handler_record". |
1208 |
* |
1209 |
* Returns true on success, false otherwise. |
1210 |
*/ |
1211 |
static bool ccs_print_execute_handler_record(struct ccs_io_buffer *head, |
1212 |
const char *keyword, |
1213 |
struct ccs_execute_handler_record * |
1214 |
ptr) |
1215 |
{ |
1216 |
return ccs_io_printf(head, "%s %s\n", keyword, ptr->handler->name); |
1217 |
} |
1218 |
|
1219 |
/** |
1220 |
* ccs_print_mount_acl - Print a mount ACL entry. |
1221 |
* |
1222 |
* @head: Pointer to "struct ccs_io_buffer". |
1223 |
* @ptr: Pointer to "struct ccs_mount_acl". |
1224 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
1225 |
* |
1226 |
* Returns true on success, false otherwise. |
1227 |
*/ |
1228 |
static bool ccs_print_mount_acl(struct ccs_io_buffer *head, |
1229 |
struct ccs_mount_acl *ptr, |
1230 |
const struct ccs_condition *cond) |
1231 |
{ |
1232 |
const int pos = head->read_avail; |
1233 |
if (!ccs_io_printf(head, CCS_KEYWORD_ALLOW_MOUNT) || |
1234 |
!ccs_print_name_union(head, &ptr->dev_name) || |
1235 |
!ccs_print_name_union(head, &ptr->dir_name) || |
1236 |
!ccs_print_name_union(head, &ptr->fs_type) || |
1237 |
!ccs_print_number_union(head, &ptr->flags) || |
1238 |
!ccs_print_condition(head, cond)) { |
1239 |
head->read_avail = pos; |
1240 |
return false; |
1241 |
} |
1242 |
return true; |
1243 |
} |
1244 |
|
1245 |
/** |
1246 |
* ccs_print_umount_acl - Print a mount ACL entry. |
1247 |
* |
1248 |
* @head: Pointer to "struct ccs_io_buffer". |
1249 |
* @ptr: Pointer to "struct ccs_umount_acl". |
1250 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
1251 |
* |
1252 |
* Returns true on success, false otherwise. |
1253 |
*/ |
1254 |
static bool ccs_print_umount_acl(struct ccs_io_buffer *head, |
1255 |
struct ccs_umount_acl *ptr, |
1256 |
const struct ccs_condition *cond) |
1257 |
{ |
1258 |
const int pos = head->read_avail; |
1259 |
if (!ccs_io_printf(head, CCS_KEYWORD_ALLOW_UNMOUNT) || |
1260 |
!ccs_print_name_union(head, &ptr->dir) || |
1261 |
!ccs_print_condition(head, cond)) { |
1262 |
head->read_avail = pos; |
1263 |
return false; |
1264 |
} |
1265 |
return true; |
1266 |
} |
1267 |
|
1268 |
/** |
1269 |
* ccs_print_chroot_acl - Print a chroot ACL entry. |
1270 |
* |
1271 |
* @head: Pointer to "struct ccs_io_buffer". |
1272 |
* @ptr: Pointer to "struct ccs_chroot_acl". |
1273 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
1274 |
* |
1275 |
* Returns true on success, false otherwise. |
1276 |
*/ |
1277 |
static bool ccs_print_chroot_acl(struct ccs_io_buffer *head, |
1278 |
struct ccs_chroot_acl *ptr, |
1279 |
const struct ccs_condition *cond) |
1280 |
{ |
1281 |
const int pos = head->read_avail; |
1282 |
if (!ccs_io_printf(head, CCS_KEYWORD_ALLOW_CHROOT) || |
1283 |
!ccs_print_name_union(head, &ptr->dir) || |
1284 |
!ccs_print_condition(head, cond)) { |
1285 |
head->read_avail = pos; |
1286 |
return false; |
1287 |
} |
1288 |
return true; |
1289 |
} |
1290 |
|
1291 |
/** |
1292 |
* ccs_print_pivot_root_acl - Print a pivot_root ACL entry. |
1293 |
* |
1294 |
* @head: Pointer to "struct ccs_io_buffer". |
1295 |
* @ptr: Pointer to "struct ccs_pivot_root_acl". |
1296 |
* @cond: Pointer to "struct ccs_condition". May be NULL. |
1297 |
* |
1298 |
* Returns true on success, false otherwise. |
1299 |
*/ |
1300 |
static bool ccs_print_pivot_root_acl(struct ccs_io_buffer *head, |
1301 |
struct ccs_pivot_root_acl *ptr, |
1302 |
const struct ccs_condition *cond) |
1303 |
{ |
1304 |
const int pos = head->read_avail; |
1305 |
if (!ccs_io_printf(head, CCS_KEYWORD_ALLOW_PIVOT_ROOT) || |
1306 |
!ccs_print_name_union(head, &ptr->new_root) || |
1307 |
!ccs_print_name_union(head, &ptr->old_root) || |
1308 |
!ccs_print_condition(head, cond)) { |
1309 |
head->read_avail = pos; |
1310 |
return false; |
1311 |
} |
1312 |
return true; |
1313 |
} |
1314 |
|
1315 |
/** |
1316 |
* ccs_print_entry - Print an ACL entry. |
1317 |
* |
1318 |
* @head: Pointer to "struct ccs_io_buffer". |
1319 |
* @ptr: Pointer to an ACL entry. |
1320 |
* |
1321 |
* Returns true on success, false otherwise. |
1322 |
*/ |
1323 |
static bool ccs_print_entry(struct ccs_io_buffer *head, |
1324 |
struct ccs_acl_info *ptr) |
1325 |
{ |
1326 |
const struct ccs_condition *cond = ptr->cond; |
1327 |
const u8 acl_type = ptr->type; |
1328 |
if (ptr->is_deleted) |
1329 |
return true; |
1330 |
if (acl_type == CCS_TYPE_PATH_ACL) { |
1331 |
struct ccs_path_acl *acl |
1332 |
= container_of(ptr, struct ccs_path_acl, |
1333 |
head); |
1334 |
return ccs_print_path_acl(head, acl, cond); |
1335 |
} |
1336 |
if (acl_type == CCS_TYPE_EXECUTE_HANDLER) { |
1337 |
struct ccs_execute_handler_record *acl |
1338 |
= container_of(ptr, struct ccs_execute_handler_record, |
1339 |
head); |
1340 |
const char *keyword = CCS_KEYWORD_EXECUTE_HANDLER; |
1341 |
return ccs_print_execute_handler_record(head, keyword, acl); |
1342 |
} |
1343 |
if (acl_type == CCS_TYPE_DENIED_EXECUTE_HANDLER) { |
1344 |
struct ccs_execute_handler_record *acl |
1345 |
= container_of(ptr, struct ccs_execute_handler_record, |
1346 |
head); |
1347 |
const char *keyword = CCS_KEYWORD_DENIED_EXECUTE_HANDLER; |
1348 |
return ccs_print_execute_handler_record(head, keyword, acl); |
1349 |
} |
1350 |
if (head->read_execute_only) |
1351 |
return true; |
1352 |
if (acl_type == CCS_TYPE_PATH_NUMBER3_ACL) { |
1353 |
struct ccs_path_number3_acl *acl |
1354 |
= container_of(ptr, struct ccs_path_number3_acl, head); |
1355 |
return ccs_print_path_number3_acl(head, acl, cond); |
1356 |
} |
1357 |
if (acl_type == CCS_TYPE_PATH2_ACL) { |
1358 |
struct ccs_path2_acl *acl |
1359 |
= container_of(ptr, struct ccs_path2_acl, |
1360 |
head); |
1361 |
return ccs_print_path2_acl(head, acl, cond); |
1362 |
} |
1363 |
if (acl_type == CCS_TYPE_PATH_NUMBER_ACL) { |
1364 |
struct ccs_path_number_acl *acl |
1365 |
= container_of(ptr, struct ccs_path_number_acl, |
1366 |
head); |
1367 |
return ccs_print_path_number_acl(head, acl, cond); |
1368 |
} |
1369 |
if (acl_type == CCS_TYPE_ENV_ACL) { |
1370 |
struct ccs_env_acl *acl |
1371 |
= container_of(ptr, struct ccs_env_acl, head); |
1372 |
return ccs_print_env_acl(head, acl, cond); |
1373 |
} |
1374 |
if (acl_type == CCS_TYPE_CAPABILITY_ACL) { |
1375 |
struct ccs_capability_acl *acl |
1376 |
= container_of(ptr, struct ccs_capability_acl, |
1377 |
head); |
1378 |
return ccs_print_capability_acl(head, acl, cond); |
1379 |
} |
1380 |
if (acl_type == CCS_TYPE_IP_NETWORK_ACL) { |
1381 |
struct ccs_ip_network_acl *acl |
1382 |
= container_of(ptr, struct ccs_ip_network_acl, |
1383 |
head); |
1384 |
return ccs_print_network_acl(head, acl, cond); |
1385 |
} |
1386 |
if (acl_type == CCS_TYPE_SIGNAL_ACL) { |
1387 |
struct ccs_signal_acl *acl |
1388 |
= container_of(ptr, struct ccs_signal_acl, head); |
1389 |
return ccs_print_signal_acl(head, acl, cond); |
1390 |
} |
1391 |
if (acl_type == CCS_TYPE_MOUNT_ACL) { |
1392 |
struct ccs_mount_acl *acl |
1393 |
= container_of(ptr, struct ccs_mount_acl, head); |
1394 |
return ccs_print_mount_acl(head, acl, cond); |
1395 |
} |
1396 |
if (acl_type == CCS_TYPE_UMOUNT_ACL) { |
1397 |
struct ccs_umount_acl *acl |
1398 |
= container_of(ptr, struct ccs_umount_acl, head); |
1399 |
return ccs_print_umount_acl(head, acl, cond); |
1400 |
} |
1401 |
if (acl_type == CCS_TYPE_CHROOT_ACL) { |
1402 |
struct ccs_chroot_acl *acl |
1403 |
= container_of(ptr, struct ccs_chroot_acl, head); |
1404 |
return ccs_print_chroot_acl(head, acl, cond); |
1405 |
} |
1406 |
if (acl_type == CCS_TYPE_PIVOT_ROOT_ACL) { |
1407 |
struct ccs_pivot_root_acl *acl |
1408 |
= container_of(ptr, struct ccs_pivot_root_acl, |
1409 |
head); |
1410 |
return ccs_print_pivot_root_acl(head, acl, cond); |
1411 |
} |
1412 |
BUG(); /* This must not happen. */ |
1413 |
return false; |
1414 |
} |
1415 |
|
1416 |
/** |
1417 |
* ccs_read_domain_policy - Read domain policy. |
1418 |
* |
1419 |
* @head: Pointer to "struct ccs_io_buffer". |
1420 |
* |
1421 |
* Returns 0. |
1422 |
* |
1423 |
* Caller holds ccs_read_lock(). |
1424 |
*/ |
1425 |
static int ccs_read_domain_policy(struct ccs_io_buffer *head) |
1426 |
{ |
1427 |
struct list_head *dpos; |
1428 |
struct list_head *apos; |
1429 |
ccs_assert_read_lock(); |
1430 |
if (head->read_eof) |
1431 |
return 0; |
1432 |
if (head->read_step == 0) |
1433 |
head->read_step = 1; |
1434 |
list_for_each_cookie(dpos, head->read_var1, &ccs_domain_list) { |
1435 |
struct ccs_domain_info *domain; |
1436 |
const char *quota_exceeded = ""; |
1437 |
const char *transition_failed = ""; |
1438 |
const char *ignore_global_allow_read = ""; |
1439 |
const char *ignore_global_allow_env = ""; |
1440 |
domain = list_entry(dpos, struct ccs_domain_info, list); |
1441 |
if (head->read_step != 1) |
1442 |
goto acl_loop; |
1443 |
if (domain->is_deleted && !head->read_single_domain) |
1444 |
continue; |
1445 |
/* Print domainname and flags. */ |
1446 |
if (domain->quota_warned) |
1447 |
quota_exceeded = "quota_exceeded\n"; |
1448 |
if (domain->domain_transition_failed) |
1449 |
transition_failed = "transition_failed\n"; |
1450 |
if (domain->ignore_global_allow_read) |
1451 |
ignore_global_allow_read |
1452 |
= CCS_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; |
1453 |
if (domain->ignore_global_allow_env) |
1454 |
ignore_global_allow_env |
1455 |
= CCS_KEYWORD_IGNORE_GLOBAL_ALLOW_ENV "\n"; |
1456 |
if (!ccs_io_printf(head, "%s\n" CCS_KEYWORD_USE_PROFILE "%u\n" |
1457 |
"%s%s%s%s\n", domain->domainname->name, |
1458 |
domain->profile, quota_exceeded, |
1459 |
transition_failed, |
1460 |
ignore_global_allow_read, |
1461 |
ignore_global_allow_env)) |
1462 |
return 0; |
1463 |
head->read_step = 2; |
1464 |
acl_loop: |
1465 |
if (head->read_step == 3) |
1466 |
goto tail_mark; |
1467 |
/* Print ACL entries in the domain. */ |
1468 |
list_for_each_cookie(apos, head->read_var2, |
1469 |
&domain->acl_info_list) { |
1470 |
struct ccs_acl_info *ptr |
1471 |
= list_entry(apos, struct ccs_acl_info, list); |
1472 |
if (!ccs_print_entry(head, ptr)) |
1473 |
return 0; |
1474 |
} |
1475 |
head->read_step = 3; |
1476 |
tail_mark: |
1477 |
if (!ccs_io_printf(head, "\n")) |
1478 |
return 0; |
1479 |
head->read_step = 1; |
1480 |
if (head->read_single_domain) |
1481 |
break; |
1482 |
} |
1483 |
head->read_eof = true; |
1484 |
return 0; |
1485 |
} |
1486 |
|
1487 |
/** |
1488 |
* ccs_write_domain_profile - Assign profile for specified domain. |
1489 |
* |
1490 |
* @head: Pointer to "struct ccs_io_buffer". |
1491 |
* |
1492 |
* Returns 0 on success, -EINVAL otherwise. |
1493 |
* |
1494 |
* This is equivalent to doing |
1495 |
* |
1496 |
* ( echo "select " $domainname; echo "use_profile " $profile ) | |
1497 |
* /usr/lib/ccs/loadpolicy -d |
1498 |
* |
1499 |
* Caller holds ccs_read_lock(). |
1500 |
*/ |
1501 |
static int ccs_write_domain_profile(struct ccs_io_buffer *head) |
1502 |
{ |
1503 |
char *data = head->write_buf; |
1504 |
char *cp = strchr(data, ' '); |
1505 |
struct ccs_domain_info *domain; |
1506 |
unsigned int profile; |
1507 |
ccs_assert_read_lock(); |
1508 |
if (!cp) |
1509 |
return -EINVAL; |
1510 |
*cp = '\0'; |
1511 |
profile = simple_strtoul(data, NULL, 10); |
1512 |
if (profile >= CCS_MAX_PROFILES) |
1513 |
return -EINVAL; |
1514 |
domain = ccs_find_domain(cp + 1); |
1515 |
if (domain && (ccs_profile_ptr[profile] || !ccs_policy_loaded)) |
1516 |
domain->profile = (u8) profile; |
1517 |
return 0; |
1518 |
} |
1519 |
|
1520 |
/** |
1521 |
* ccs_read_domain_profile - Read only domainname and profile. |
1522 |
* |
1523 |
* @head: Pointer to "struct ccs_io_buffer". |
1524 |
* |
1525 |
* Returns list of profile number and domainname pairs. |
1526 |
* |
1527 |
* This is equivalent to doing |
1528 |
* |
1529 |
* grep -A 1 '^<kernel>' /proc/ccs/domain_policy | |
1530 |
* awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) |
1531 |
* domainname = $0; } else if ( $1 == "use_profile" ) { |
1532 |
* print $2 " " domainname; domainname = ""; } } ; ' |
1533 |
* |
1534 |
* Caller holds ccs_read_lock(). |
1535 |
*/ |
1536 |
static int ccs_read_domain_profile(struct ccs_io_buffer *head) |
1537 |
{ |
1538 |
struct list_head *pos; |
1539 |
ccs_assert_read_lock(); |
1540 |
if (head->read_eof) |
1541 |
return 0; |
1542 |
list_for_each_cookie(pos, head->read_var1, &ccs_domain_list) { |
1543 |
struct ccs_domain_info *domain; |
1544 |
domain = list_entry(pos, struct ccs_domain_info, list); |
1545 |
if (domain->is_deleted) |
1546 |
continue; |
1547 |
if (!ccs_io_printf(head, "%u %s\n", domain->profile, |
1548 |
domain->domainname->name)) |
1549 |
return 0; |
1550 |
} |
1551 |
head->read_eof = true; |
1552 |
return 0; |
1553 |
} |
1554 |
|
1555 |
/** |
1556 |
* ccs_write_pid: Specify PID to obtain domainname. |
1557 |
* |
1558 |
* @head: Pointer to "struct ccs_io_buffer". |
1559 |
* |
1560 |
* Returns 0. |
1561 |
*/ |
1562 |
static int ccs_write_pid(struct ccs_io_buffer *head) |
1563 |
{ |
1564 |
head->read_eof = false; |
1565 |
return 0; |
1566 |
} |
1567 |
|
1568 |
/** |
1569 |
* ccs_read_pid - Read information of a process. |
1570 |
* |
1571 |
* @head: Pointer to "struct ccs_io_buffer". |
1572 |
* |
1573 |
* Returns the domainname which the specified PID is in or |
1574 |
* process information of the specified PID on success, |
1575 |
* empty string otherwise. |
1576 |
* |
1577 |
* Caller holds ccs_read_lock(). |
1578 |
*/ |
1579 |
static int ccs_read_pid(struct ccs_io_buffer *head) |
1580 |
{ |
1581 |
char *buf = head->write_buf; |
1582 |
bool task_info = false; |
1583 |
unsigned int pid; |
1584 |
struct task_struct *p; |
1585 |
struct ccs_domain_info *domain = NULL; |
1586 |
u32 ccs_flags = 0; |
1587 |
ccs_assert_read_lock(); |
1588 |
/* Accessing write_buf is safe because head->io_sem is held. */ |
1589 |
if (!buf) |
1590 |
goto done; /* Do nothing if open(O_RDONLY). */ |
1591 |
if (head->read_avail || head->read_eof) |
1592 |
goto done; |
1593 |
head->read_eof = true; |
1594 |
if (ccs_str_starts(&buf, "info ")) |
1595 |
task_info = true; |
1596 |
pid = (unsigned int) simple_strtoul(buf, NULL, 10); |
1597 |
/***** CRITICAL SECTION START *****/ |
1598 |
read_lock(&tasklist_lock); |
1599 |
p = find_task_by_pid(pid); |
1600 |
if (p) { |
1601 |
domain = ccs_task_domain(p); |
1602 |
ccs_flags = p->ccs_flags; |
1603 |
} |
1604 |
read_unlock(&tasklist_lock); |
1605 |
/***** CRITICAL SECTION END *****/ |
1606 |
if (!domain) |
1607 |
goto done; |
1608 |
if (!task_info) |
1609 |
ccs_io_printf(head, "%u %u %s", pid, domain->profile, |
1610 |
domain->domainname->name); |
1611 |
else |
1612 |
ccs_io_printf(head, "%u manager=%s execute_handler=%s " |
1613 |
"state[0]=%u state[1]=%u state[2]=%u", pid, |
1614 |
ccs_flags & CCS_TASK_IS_POLICY_MANAGER ? |
1615 |
"yes" : "no", |
1616 |
ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER ? |
1617 |
"yes" : "no", |
1618 |
(u8) (ccs_flags >> 24), |
1619 |
(u8) (ccs_flags >> 16), |
1620 |
(u8) (ccs_flags >> 8)); |
1621 |
done: |
1622 |
return 0; |
1623 |
} |
1624 |
|
1625 |
/** |
1626 |
* ccs_write_exception_policy - Write exception policy. |
1627 |
* |
1628 |
* @head: Pointer to "struct ccs_io_buffer". |
1629 |
* |
1630 |
* Returns 0 on success, negative value otherwise. |
1631 |
*/ |
1632 |
static int ccs_write_exception_policy(struct ccs_io_buffer *head) |
1633 |
{ |
1634 |
char *data = head->write_buf; |
1635 |
bool is_delete = ccs_str_starts(&data, CCS_KEYWORD_DELETE); |
1636 |
if (ccs_str_starts(&data, CCS_KEYWORD_KEEP_DOMAIN)) |
1637 |
return ccs_write_domain_keeper_policy(data, false, is_delete); |
1638 |
if (ccs_str_starts(&data, CCS_KEYWORD_NO_KEEP_DOMAIN)) |
1639 |
return ccs_write_domain_keeper_policy(data, true, is_delete); |
1640 |
if (ccs_str_starts(&data, CCS_KEYWORD_INITIALIZE_DOMAIN)) |
1641 |
return ccs_write_domain_initializer_policy(data, false, |
1642 |
is_delete); |
1643 |
if (ccs_str_starts(&data, CCS_KEYWORD_NO_INITIALIZE_DOMAIN)) |
1644 |
return ccs_write_domain_initializer_policy(data, true, |
1645 |
is_delete); |
1646 |
if (ccs_str_starts(&data, CCS_KEYWORD_AGGREGATOR)) |
1647 |
return ccs_write_aggregator_policy(data, is_delete); |
1648 |
if (ccs_str_starts(&data, CCS_KEYWORD_ALLOW_READ)) |
1649 |
return ccs_write_globally_readable_policy(data, is_delete); |
1650 |
if (ccs_str_starts(&data, CCS_KEYWORD_ALLOW_ENV)) |
1651 |
return ccs_write_globally_usable_env_policy(data, is_delete); |
1652 |
if (ccs_str_starts(&data, CCS_KEYWORD_FILE_PATTERN)) |
1653 |
return ccs_write_pattern_policy(data, is_delete); |
1654 |
if (ccs_str_starts(&data, CCS_KEYWORD_PATH_GROUP)) |
1655 |
return ccs_write_path_group_policy(data, is_delete); |
1656 |
if (ccs_str_starts(&data, CCS_KEYWORD_NUMBER_GROUP)) |
1657 |
return ccs_write_number_group_policy(data, is_delete); |
1658 |
if (ccs_str_starts(&data, CCS_KEYWORD_DENY_REWRITE)) |
1659 |
return ccs_write_no_rewrite_policy(data, is_delete); |
1660 |
if (ccs_str_starts(&data, CCS_KEYWORD_ADDRESS_GROUP)) |
1661 |
return ccs_write_address_group_policy(data, is_delete); |
1662 |
if (ccs_str_starts(&data, CCS_KEYWORD_DENY_AUTOBIND)) |
1663 |
return ccs_write_reserved_port_policy(data, is_delete); |
1664 |
return -EINVAL; |
1665 |
} |
1666 |
|
1667 |
/** |
1668 |
* ccs_read_exception_policy - Read exception policy. |
1669 |
* |
1670 |
* @head: Pointer to "struct ccs_io_buffer". |
1671 |
* |
1672 |
* Returns 0 on success, -EINVAL otherwise. |
1673 |
* |
1674 |
* Caller holds ccs_read_lock(). |
1675 |
*/ |
1676 |
static int ccs_read_exception_policy(struct ccs_io_buffer *head) |
1677 |
{ |
1678 |
ccs_assert_read_lock(); |
1679 |
if (!head->read_eof) { |
1680 |
switch (head->read_step) { |
1681 |
case 0: |
1682 |
head->read_var2 = NULL; |
1683 |
head->read_step = 1; |
1684 |
case 1: |
1685 |
if (!ccs_read_domain_keeper_policy(head)) |
1686 |
break; |
1687 |
head->read_var2 = NULL; |
1688 |
head->read_step = 2; |
1689 |
case 2: |
1690 |
if (!ccs_read_globally_readable_policy(head)) |
1691 |
break; |
1692 |
head->read_var2 = NULL; |
1693 |
head->read_step = 3; |
1694 |
case 3: |
1695 |
if (!ccs_read_globally_usable_env_policy(head)) |
1696 |
break; |
1697 |
head->read_var2 = NULL; |
1698 |
head->read_step = 4; |
1699 |
case 4: |
1700 |
if (!ccs_read_domain_initializer_policy(head)) |
1701 |
break; |
1702 |
head->read_var2 = NULL; |
1703 |
head->read_step = 6; |
1704 |
case 6: |
1705 |
if (!ccs_read_aggregator_policy(head)) |
1706 |
break; |
1707 |
head->read_var2 = NULL; |
1708 |
head->read_step = 7; |
1709 |
case 7: |
1710 |
if (!ccs_read_file_pattern(head)) |
1711 |
break; |
1712 |
head->read_var2 = NULL; |
1713 |
head->read_step = 8; |
1714 |
case 8: |
1715 |
if (!ccs_read_no_rewrite_policy(head)) |
1716 |
break; |
1717 |
head->read_var2 = NULL; |
1718 |
head->read_step = 9; |
1719 |
case 9: |
1720 |
if (!ccs_read_path_group_policy(head)) |
1721 |
break; |
1722 |
head->read_var1 = NULL; |
1723 |
head->read_var2 = NULL; |
1724 |
head->read_step = 10; |
1725 |
case 10: |
1726 |
if (!ccs_read_number_group_policy(head)) |
1727 |
break; |
1728 |
head->read_var1 = NULL; |
1729 |
head->read_var2 = NULL; |
1730 |
head->read_step = 11; |
1731 |
case 11: |
1732 |
if (!ccs_read_address_group_policy(head)) |
1733 |
break; |
1734 |
head->read_var2 = NULL; |
1735 |
head->read_step = 12; |
1736 |
case 12: |
1737 |
if (!ccs_read_reserved_port_policy(head)) |
1738 |
break; |
1739 |
head->read_eof = true; |
1740 |
break; |
1741 |
default: |
1742 |
return -EINVAL; |
1743 |
} |
1744 |
} |
1745 |
return 0; |
1746 |
} |
1747 |
|
1748 |
/** |
1749 |
* ccs_get_argv0 - Get argv[0]. |
1750 |
* |
1751 |
* @ee: Pointer to "struct ccs_execve_entry". |
1752 |
* |
1753 |
* Returns true on success, false otherwise. |
1754 |
*/ |
1755 |
static bool ccs_get_argv0(struct ccs_execve_entry *ee) |
1756 |
{ |
1757 |
struct linux_binprm *bprm = ee->bprm; |
1758 |
char *arg_ptr = ee->tmp; |
1759 |
int arg_len = 0; |
1760 |
unsigned long pos = bprm->p; |
1761 |
int offset = pos % PAGE_SIZE; |
1762 |
bool done = false; |
1763 |
if (!bprm->argc) |
1764 |
goto out; |
1765 |
while (1) { |
1766 |
if (!ccs_dump_page(bprm, pos, &ee->dump)) |
1767 |
goto out; |
1768 |
pos += PAGE_SIZE - offset; |
1769 |
/* Read. */ |
1770 |
while (offset < PAGE_SIZE) { |
1771 |
const char *kaddr = ee->dump.data; |
1772 |
const unsigned char c = kaddr[offset++]; |
1773 |
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
1774 |
if (c == '\\') { |
1775 |
arg_ptr[arg_len++] = '\\'; |
1776 |
arg_ptr[arg_len++] = '\\'; |
1777 |
} else if (c == '/') { |
1778 |
arg_len = 0; |
1779 |
} else if (c > ' ' && c < 127) { |
1780 |
arg_ptr[arg_len++] = c; |
1781 |
} else { |
1782 |
arg_ptr[arg_len++] = '\\'; |
1783 |
arg_ptr[arg_len++] = (c >> 6) + '0'; |
1784 |
arg_ptr[arg_len++] |
1785 |
= ((c >> 3) & 7) + '0'; |
1786 |
arg_ptr[arg_len++] = (c & 7) + '0'; |
1787 |
} |
1788 |
} else { |
1789 |
arg_ptr[arg_len] = '\0'; |
1790 |
done = true; |
1791 |
break; |
1792 |
} |
1793 |
} |
1794 |
offset = 0; |
1795 |
if (done) |
1796 |
break; |
1797 |
} |
1798 |
return true; |
1799 |
out: |
1800 |
return false; |
1801 |
} |
1802 |
|
1803 |
static struct ccs_condition *ccs_get_execute_condition(struct ccs_execve_entry |
1804 |
*ee) |
1805 |
{ |
1806 |
struct ccs_condition *cond; |
1807 |
char *buf; |
1808 |
int len = 256; |
1809 |
char *realpath = NULL; |
1810 |
char *argv0 = NULL; |
1811 |
if (ccs_flags(NULL, CCS_AUTOLEARN_EXEC_REALPATH)) { |
1812 |
struct file *file = ee->bprm->file; |
1813 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) |
1814 |
struct path path = { file->f_vfsmnt, file->f_dentry }; |
1815 |
realpath = ccs_realpath_from_path(&path); |
1816 |
#else |
1817 |
realpath = ccs_realpath_from_path(&file->f_path); |
1818 |
#endif |
1819 |
if (realpath) |
1820 |
len += strlen(realpath) + 17; |
1821 |
} |
1822 |
if (ccs_flags(NULL, CCS_AUTOLEARN_EXEC_REALPATH)) { |
1823 |
if (ccs_get_argv0(ee)) { |
1824 |
argv0 = ee->tmp; |
1825 |
len += strlen(argv0) + 16; |
1826 |
} |
1827 |
} |
1828 |
buf = kmalloc(len, GFP_KERNEL); |
1829 |
if (!buf) |
1830 |
return NULL; |
1831 |
snprintf(buf, len - 1, "if"); |
1832 |
if (current->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER) { |
1833 |
const int pos = strlen(buf); |
1834 |
snprintf(buf + pos, len - pos - 1, |
1835 |
" task.type=execute_handler"); |
1836 |
} |
1837 |
if (realpath) { |
1838 |
const int pos = strlen(buf); |
1839 |
snprintf(buf + pos, len - pos - 1, " exec.realpath=\"%s\"", |
1840 |
realpath); |
1841 |
kfree(realpath); |
1842 |
} |
1843 |
if (argv0) { |
1844 |
const int pos = strlen(buf); |
1845 |
snprintf(buf + pos, len - pos - 1, " exec.argv[0]=\"%s\"", |
1846 |
argv0); |
1847 |
} |
1848 |
cond = ccs_get_condition(buf); |
1849 |
kfree(buf); |
1850 |
return cond; |
1851 |
} |
1852 |
|
1853 |
/* Wait queue for ccs_query_list. */ |
1854 |
static DECLARE_WAIT_QUEUE_HEAD(ccs_query_wait); |
1855 |
|
1856 |
/* Lock for manipulating ccs_query_list. */ |
1857 |
static DEFINE_SPINLOCK(ccs_query_list_lock); |
1858 |
|
1859 |
/* Structure for query. */ |
1860 |
struct ccs_query_entry { |
1861 |
struct list_head list; |
1862 |
char *query; |
1863 |
int query_len; |
1864 |
unsigned int serial; |
1865 |
int timer; |
1866 |
int answer; |
1867 |
}; |
1868 |
|
1869 |
/* The list for "struct ccs_query_entry". */ |
1870 |
static LIST_HEAD(ccs_query_list); |
1871 |
|
1872 |
/* Number of "struct file" referring /proc/ccs/query interface. */ |
1873 |
static atomic_t ccs_query_observers = ATOMIC_INIT(0); |
1874 |
|
1875 |
/** |
1876 |
* ccs_supervisor - Ask for the supervisor's decision. |
1877 |
* |
1878 |
* @r: Pointer to "struct ccs_request_info". |
1879 |
* @fmt: The printf()'s format string, followed by parameters. |
1880 |
* |
1881 |
* Returns 0 if the supervisor decided to permit the access request which |
1882 |
* violated the policy in enforcing mode, 1 if the supervisor decided to |
1883 |
* retry the access request which violated the policy in enforcing mode, |
1884 |
* 0 if it is not in enforcing mode, -EPERM otherwise. |
1885 |
*/ |
1886 |
int ccs_supervisor(struct ccs_request_info *r, const char *fmt, ...) |
1887 |
{ |
1888 |
va_list args; |
1889 |
int error = -EPERM; |
1890 |
int pos; |
1891 |
int len; |
1892 |
static unsigned int ccs_serial; |
1893 |
struct ccs_query_entry *ccs_query_entry = NULL; |
1894 |
bool quota_exceeded = false; |
1895 |
char *header; |
1896 |
if (!r->domain) |
1897 |
r->domain = ccs_current_domain(); |
1898 |
switch (r->mode) { |
1899 |
char *buffer; |
1900 |
struct ccs_condition *cond; |
1901 |
case 1: |
1902 |
if (!ccs_domain_quota_ok(r)) |
1903 |
return 0; |
1904 |
va_start(args, fmt); |
1905 |
len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4; |
1906 |
va_end(args); |
1907 |
buffer = kmalloc(len, GFP_KERNEL); |
1908 |
if (!buffer) |
1909 |
return 0; |
1910 |
va_start(args, fmt); |
1911 |
vsnprintf(buffer, len - 1, fmt, args); |
1912 |
va_end(args); |
1913 |
ccs_normalize_line(buffer); |
1914 |
if (r->ee && !strncmp(buffer, "allow_execute ", 14)) |
1915 |
cond = ccs_get_execute_condition(r->ee); |
1916 |
else if ((current->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER)) { |
1917 |
char str[] = "if task.type=execute_handler"; |
1918 |
cond = ccs_get_condition(str); |
1919 |
} else |
1920 |
cond = NULL; |
1921 |
ccs_write_domain_policy2(buffer, r->domain, cond, false); |
1922 |
ccs_put_condition(cond); |
1923 |
kfree(buffer); |
1924 |
/* fall through */ |
1925 |
case 2: |
1926 |
return 0; |
1927 |
} |
1928 |
if (!atomic_read(&ccs_query_observers)) { |
1929 |
int i; |
1930 |
if (current->ccs_flags & CCS_DONT_SLEEP_ON_ENFORCE_ERROR) |
1931 |
return -EPERM; |
1932 |
for (i = 0; i < ccs_flags(r->domain, CCS_SLEEP_PERIOD); |
1933 |
i++) { |
1934 |
set_current_state(TASK_INTERRUPTIBLE); |
1935 |
schedule_timeout(HZ / 10); |
1936 |
} |
1937 |
return -EPERM; |
1938 |
} |
1939 |
va_start(args, fmt); |
1940 |
len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; |
1941 |
va_end(args); |
1942 |
header = ccs_init_audit_log(&len, r); |
1943 |
if (!header) |
1944 |
goto out; |
1945 |
ccs_query_entry = kzalloc(sizeof(*ccs_query_entry), GFP_KERNEL); |
1946 |
if (!ccs_query_entry) |
1947 |
goto out; |
1948 |
len = ccs_round2(len); |
1949 |
ccs_query_entry->query = kzalloc(len, GFP_KERNEL); |
1950 |
if (!ccs_query_entry->query) |
1951 |
goto out; |
1952 |
INIT_LIST_HEAD(&ccs_query_entry->list); |
1953 |
/***** CRITICAL SECTION START *****/ |
1954 |
spin_lock(&ccs_query_list_lock); |
1955 |
if (ccs_quota_for_query && ccs_query_memory_size + len + |
1956 |
sizeof(*ccs_query_entry) >= ccs_quota_for_query) { |
1957 |
quota_exceeded = true; |
1958 |
} else { |
1959 |
ccs_query_memory_size += len + sizeof(*ccs_query_entry); |
1960 |
ccs_query_entry->serial = ccs_serial++; |
1961 |
} |
1962 |
spin_unlock(&ccs_query_list_lock); |
1963 |
/***** CRITICAL SECTION END *****/ |
1964 |
if (quota_exceeded) |
1965 |
goto out; |
1966 |
pos = snprintf(ccs_query_entry->query, len - 1, "Q%u-%hu\n%s", |
1967 |
ccs_query_entry->serial, r->retry, header); |
1968 |
kfree(header); |
1969 |
header = NULL; |
1970 |
va_start(args, fmt); |
1971 |
vsnprintf(ccs_query_entry->query + pos, len - 1 - pos, fmt, args); |
1972 |
ccs_query_entry->query_len = strlen(ccs_query_entry->query) + 1; |
1973 |
va_end(args); |
1974 |
/***** CRITICAL SECTION START *****/ |
1975 |
spin_lock(&ccs_query_list_lock); |
1976 |
list_add_tail(&ccs_query_entry->list, &ccs_query_list); |
1977 |
spin_unlock(&ccs_query_list_lock); |
1978 |
/***** CRITICAL SECTION END *****/ |
1979 |
/* Give 10 seconds for supervisor's opinion. */ |
1980 |
for (ccs_query_entry->timer = 0; |
1981 |
atomic_read(&ccs_query_observers) && ccs_query_entry->timer < 100; |
1982 |
ccs_query_entry->timer++) { |
1983 |
wake_up(&ccs_query_wait); |
1984 |
set_current_state(TASK_INTERRUPTIBLE); |
1985 |
schedule_timeout(HZ / 10); |
1986 |
if (ccs_query_entry->answer) |
1987 |
break; |
1988 |
} |
1989 |
/***** CRITICAL SECTION START *****/ |
1990 |
spin_lock(&ccs_query_list_lock); |
1991 |
list_del(&ccs_query_entry->list); |
1992 |
ccs_query_memory_size -= len + sizeof(*ccs_query_entry); |
1993 |
spin_unlock(&ccs_query_list_lock); |
1994 |
/***** CRITICAL SECTION END *****/ |
1995 |
switch (ccs_query_entry->answer) { |
1996 |
case 3: /* Asked to retry by administrator. */ |
1997 |
error = 1; |
1998 |
r->retry++; |
1999 |
break; |
2000 |
case 1: |
2001 |
/* Granted by administrator. */ |
2002 |
error = 0; |
2003 |
break; |
2004 |
case 0: |
2005 |
/* Timed out. */ |
2006 |
break; |
2007 |
default: |
2008 |
/* Rejected by administrator. */ |
2009 |
break; |
2010 |
} |
2011 |
out: |
2012 |
if (ccs_query_entry) |
2013 |
kfree(ccs_query_entry->query); |
2014 |
kfree(ccs_query_entry); |
2015 |
kfree(header); |
2016 |
return error; |
2017 |
} |
2018 |
|
2019 |
/** |
2020 |
* ccs_poll_query - poll() for /proc/ccs/query. |
2021 |
* |
2022 |
* @file: Pointer to "struct file". |
2023 |
* @wait: Pointer to "poll_table". |
2024 |
* |
2025 |
* Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. |
2026 |
* |
2027 |
* Waits for access requests which violated policy in enforcing mode. |
2028 |
*/ |
2029 |
static int ccs_poll_query(struct file *file, poll_table *wait) |
2030 |
{ |
2031 |
struct list_head *tmp; |
2032 |
bool found = false; |
2033 |
u8 i; |
2034 |
for (i = 0; i < 2; i++) { |
2035 |
/***** CRITICAL SECTION START *****/ |
2036 |
spin_lock(&ccs_query_list_lock); |
2037 |
list_for_each(tmp, &ccs_query_list) { |
2038 |
struct ccs_query_entry *ptr |
2039 |
= list_entry(tmp, struct ccs_query_entry, list); |
2040 |
if (ptr->answer) |
2041 |
continue; |
2042 |
found = true; |
2043 |
break; |
2044 |
} |
2045 |
spin_unlock(&ccs_query_list_lock); |
2046 |
/***** CRITICAL SECTION END *****/ |
2047 |
if (found) |
2048 |
return POLLIN | POLLRDNORM; |
2049 |
if (i) |
2050 |
break; |
2051 |
poll_wait(file, &ccs_query_wait, wait); |
2052 |
} |
2053 |
return 0; |
2054 |
} |
2055 |
|
2056 |
/** |
2057 |
* ccs_read_query - Read access requests which violated policy in enforcing mode. |
2058 |
* |
2059 |
* @head: Pointer to "struct ccs_io_buffer". |
2060 |
* |
2061 |
* Returns 0. |
2062 |
*/ |
2063 |
static int ccs_read_query(struct ccs_io_buffer *head) |
2064 |
{ |
2065 |
struct list_head *tmp; |
2066 |
int pos = 0; |
2067 |
int len = 0; |
2068 |
char *buf; |
2069 |
if (head->read_avail) |
2070 |
return 0; |
2071 |
if (head->read_buf) { |
2072 |
kfree(head->read_buf); |
2073 |
head->read_buf = NULL; |
2074 |
head->readbuf_size = 0; |
2075 |
} |
2076 |
/***** CRITICAL SECTION START *****/ |
2077 |
spin_lock(&ccs_query_list_lock); |
2078 |
list_for_each(tmp, &ccs_query_list) { |
2079 |
struct ccs_query_entry *ptr |
2080 |
= list_entry(tmp, struct ccs_query_entry, list); |
2081 |
if (ptr->answer) |
2082 |
continue; |
2083 |
if (pos++ != head->read_step) |
2084 |
continue; |
2085 |
len = ptr->query_len; |
2086 |
break; |
2087 |
} |
2088 |
spin_unlock(&ccs_query_list_lock); |
2089 |
/***** CRITICAL SECTION END *****/ |
2090 |
if (!len) { |
2091 |
head->read_step = 0; |
2092 |
return 0; |
2093 |
} |
2094 |
buf = kzalloc(len, GFP_KERNEL); |
2095 |
if (!buf) |
2096 |
return 0; |
2097 |
pos = 0; |
2098 |
/***** CRITICAL SECTION START *****/ |
2099 |
spin_lock(&ccs_query_list_lock); |
2100 |
list_for_each(tmp, &ccs_query_list) { |
2101 |
struct ccs_query_entry *ptr |
2102 |
= list_entry(tmp, struct ccs_query_entry, list); |
2103 |
if (ptr->answer) |
2104 |
continue; |
2105 |
if (pos++ != head->read_step) |
2106 |
continue; |
2107 |
/* |
2108 |
* Some query can be skipped because ccs_query_list |
2109 |
* can change, but I don't care. |
2110 |
*/ |
2111 |
if (len == ptr->query_len) |
2112 |
memmove(buf, ptr->query, len); |
2113 |
break; |
2114 |
} |
2115 |
spin_unlock(&ccs_query_list_lock); |
2116 |
/***** CRITICAL SECTION END *****/ |
2117 |
if (buf[0]) { |
2118 |
head->read_avail = len; |
2119 |
head->readbuf_size = head->read_avail; |
2120 |
head->read_buf = buf; |
2121 |
head->read_step++; |
2122 |
} else { |
2123 |
kfree(buf); |
2124 |
} |
2125 |
return 0; |
2126 |
} |
2127 |
|
2128 |
/** |
2129 |
* ccs_write_answer - Write the supervisor's decision. |
2130 |
* |
2131 |
* @head: Pointer to "struct ccs_io_buffer". |
2132 |
* |
2133 |
* Returns 0 on success, -EINVAL otherwise. |
2134 |
*/ |
2135 |
static int ccs_write_answer(struct ccs_io_buffer *head) |
2136 |
{ |
2137 |
char *data = head->write_buf; |
2138 |
struct list_head *tmp; |
2139 |
unsigned int serial; |
2140 |
unsigned int answer; |
2141 |
/***** CRITICAL SECTION START *****/ |
2142 |
spin_lock(&ccs_query_list_lock); |
2143 |
list_for_each(tmp, &ccs_query_list) { |
2144 |
struct ccs_query_entry *ptr |
2145 |
= list_entry(tmp, struct ccs_query_entry, list); |
2146 |
ptr->timer = 0; |
2147 |
} |
2148 |
spin_unlock(&ccs_query_list_lock); |
2149 |
/***** CRITICAL SECTION END *****/ |
2150 |
if (sscanf(data, "A%u=%u", &serial, &answer) != 2) |
2151 |
return -EINVAL; |
2152 |
/***** CRITICAL SECTION START *****/ |
2153 |
spin_lock(&ccs_query_list_lock); |
2154 |
list_for_each(tmp, &ccs_query_list) { |
2155 |
struct ccs_query_entry *ptr |
2156 |
= list_entry(tmp, struct ccs_query_entry, list); |
2157 |
if (ptr->serial != serial) |
2158 |
continue; |
2159 |
if (!ptr->answer) |
2160 |
ptr->answer = answer; |
2161 |
break; |
2162 |
} |
2163 |
spin_unlock(&ccs_query_list_lock); |
2164 |
/***** CRITICAL SECTION END *****/ |
2165 |
return 0; |
2166 |
} |
2167 |
|
2168 |
/** |
2169 |
* ccs_read_version: Get version. |
2170 |
* |
2171 |
* @head: Pointer to "struct ccs_io_buffer". |
2172 |
* |
2173 |
* Returns version information. |
2174 |
*/ |
2175 |
static int ccs_read_version(struct ccs_io_buffer *head) |
2176 |
{ |
2177 |
if (!head->read_eof) { |
2178 |
ccs_io_printf(head, "1.7.0-pre"); |
2179 |
head->read_eof = true; |
2180 |
} |
2181 |
return 0; |
2182 |
} |
2183 |
|
2184 |
/** |
2185 |
* ccs_read_self_domain - Get the current process's domainname. |
2186 |
* |
2187 |
* @head: Pointer to "struct ccs_io_buffer". |
2188 |
* |
2189 |
* Returns the current process's domainname. |
2190 |
*/ |
2191 |
static int ccs_read_self_domain(struct ccs_io_buffer *head) |
2192 |
{ |
2193 |
if (!head->read_eof) { |
2194 |
/* |
2195 |
* ccs_current_domain()->domainname != NULL |
2196 |
* because every process belongs to a domain and |
2197 |
* the domain's name cannot be NULL. |
2198 |
*/ |
2199 |
ccs_io_printf(head, "%s", |
2200 |
ccs_current_domain()->domainname->name); |
2201 |
head->read_eof = true; |
2202 |
} |
2203 |
return 0; |
2204 |
} |
2205 |
|
2206 |
/** |
2207 |
* ccs_open_control - open() for /proc/ccs/ interface. |
2208 |
* |
2209 |
* @type: Type of interface. |
2210 |
* @file: Pointer to "struct file". |
2211 |
* |
2212 |
* Associates policy handler and returns 0 on success, -ENOMEM otherwise. |
2213 |
*/ |
2214 |
int ccs_open_control(const u8 type, struct file *file) |
2215 |
{ |
2216 |
struct ccs_io_buffer *head = kzalloc(sizeof(*head), GFP_KERNEL); |
2217 |
if (!head) |
2218 |
return -ENOMEM; |
2219 |
mutex_init(&head->io_sem); |
2220 |
head->type = type; |
2221 |
switch (type) { |
2222 |
case CCS_DOMAINPOLICY: /* /proc/ccs/domain_policy */ |
2223 |
head->write = ccs_write_domain_policy; |
2224 |
head->read = ccs_read_domain_policy; |
2225 |
break; |
2226 |
case CCS_EXCEPTIONPOLICY: /* /proc/ccs/exception_policy */ |
2227 |
head->write = ccs_write_exception_policy; |
2228 |
head->read = ccs_read_exception_policy; |
2229 |
break; |
2230 |
#ifdef CONFIG_CCSECURITY_AUDIT |
2231 |
case CCS_GRANTLOG: /* /proc/ccs/grant_log */ |
2232 |
head->poll = ccs_poll_grant_log; |
2233 |
head->read = ccs_read_grant_log; |
2234 |
break; |
2235 |
case CCS_REJECTLOG: /* /proc/ccs/reject_log */ |
2236 |
head->poll = ccs_poll_reject_log; |
2237 |
head->read = ccs_read_reject_log; |
2238 |
break; |
2239 |
#endif |
2240 |
case CCS_SELFDOMAIN: /* /proc/ccs/self_domain */ |
2241 |
head->read = ccs_read_self_domain; |
2242 |
break; |
2243 |
case CCS_DOMAIN_STATUS: /* /proc/ccs/.domain_status */ |
2244 |
head->write = ccs_write_domain_profile; |
2245 |
head->read = ccs_read_domain_profile; |
2246 |
break; |
2247 |
case CCS_EXECUTE_HANDLER: /* /proc/ccs/.execute_handler */ |
2248 |
/* Allow execute_handler to read process's status. */ |
2249 |
if (!(current->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER)) { |
2250 |
kfree(head); |
2251 |
return -EPERM; |
2252 |
} |
2253 |
/* fall through */ |
2254 |
case CCS_PROCESS_STATUS: /* /proc/ccs/.process_status */ |
2255 |
head->write = ccs_write_pid; |
2256 |
head->read = ccs_read_pid; |
2257 |
break; |
2258 |
case CCS_VERSION: /* /proc/ccs/version */ |
2259 |
head->read = ccs_read_version; |
2260 |
head->readbuf_size = 128; |
2261 |
break; |
2262 |
case CCS_MEMINFO: /* /proc/ccs/meminfo */ |
2263 |
head->write = ccs_write_memory_quota; |
2264 |
head->read = ccs_read_memory_counter; |
2265 |
head->readbuf_size = 512; |
2266 |
break; |
2267 |
case CCS_PROFILE: /* /proc/ccs/profile */ |
2268 |
head->write = ccs_write_profile; |
2269 |
head->read = ccs_read_profile; |
2270 |
break; |
2271 |
case CCS_QUERY: /* /proc/ccs/query */ |
2272 |
head->poll = ccs_poll_query; |
2273 |
head->write = ccs_write_answer; |
2274 |
head->read = ccs_read_query; |
2275 |
break; |
2276 |
case CCS_MANAGER: /* /proc/ccs/manager */ |
2277 |
head->write = ccs_write_manager_policy; |
2278 |
head->read = ccs_read_manager_policy; |
2279 |
break; |
2280 |
} |
2281 |
if (!(file->f_mode & FMODE_READ)) { |
2282 |
/* |
2283 |
* No need to allocate read_buf since it is not opened |
2284 |
* for reading. |
2285 |
*/ |
2286 |
head->read = NULL; |
2287 |
head->poll = NULL; |
2288 |
} else if (type != CCS_QUERY && |
2289 |
type != CCS_GRANTLOG && type != CCS_REJECTLOG) { |
2290 |
/* |
2291 |
* Don't allocate buffer for reading if the file is one of |
2292 |
* /proc/ccs/grant_log , /proc/ccs/reject_log , /proc/ccs/query. |
2293 |
*/ |
2294 |
if (!head->readbuf_size) |
2295 |
head->readbuf_size = 4096 * 2; |
2296 |
head->read_buf = kzalloc(head->readbuf_size, GFP_KERNEL); |
2297 |
if (!head->read_buf) { |
2298 |
kfree(head); |
2299 |
return -ENOMEM; |
2300 |
} |
2301 |
} |
2302 |
if (!(file->f_mode & FMODE_WRITE)) { |
2303 |
/* |
2304 |
* No need to allocate write_buf since it is not opened |
2305 |
* for writing. |
2306 |
*/ |
2307 |
head->write = NULL; |
2308 |
} else if (head->write) { |
2309 |
head->writebuf_size = 4096 * 2; |
2310 |
head->write_buf = kzalloc(head->writebuf_size, GFP_KERNEL); |
2311 |
if (!head->write_buf) { |
2312 |
kfree(head->read_buf); |
2313 |
kfree(head); |
2314 |
return -ENOMEM; |
2315 |
} |
2316 |
} |
2317 |
if (type != CCS_QUERY && |
2318 |
type != CCS_GRANTLOG && type != CCS_REJECTLOG) |
2319 |
head->reader_idx = ccs_read_lock(); |
2320 |
file->private_data = head; |
2321 |
/* |
2322 |
* Call the handler now if the file is /proc/ccs/self_domain |
2323 |
* so that the user can use "cat < /proc/ccs/self_domain" to |
2324 |
* know the current process's domainname. |
2325 |
*/ |
2326 |
if (type == CCS_SELFDOMAIN) |
2327 |
ccs_read_control(file, NULL, 0); |
2328 |
/* |
2329 |
* If the file is /proc/ccs/query , increment the observer counter. |
2330 |
* The obserber counter is used by ccs_supervisor() to see if |
2331 |
* there is some process monitoring /proc/ccs/query. |
2332 |
*/ |
2333 |
else if (type == CCS_QUERY) |
2334 |
atomic_inc(&ccs_query_observers); |
2335 |
return 0; |
2336 |
} |
2337 |
|
2338 |
/** |
2339 |
* ccs_poll_control - poll() for /proc/ccs/ interface. |
2340 |
* |
2341 |
* @file: Pointer to "struct file". |
2342 |
* @wait: Pointer to "poll_table". |
2343 |
* |
2344 |
* Waits for read readiness. |
2345 |
* /proc/ccs/query is handled by /usr/lib/ccs/ccs-queryd and |
2346 |
* /proc/ccs/grant_log and /proc/ccs/reject_log are handled by |
2347 |
* /usr/lib/ccs/ccs-auditd. |
2348 |
*/ |
2349 |
int ccs_poll_control(struct file *file, poll_table *wait) |
2350 |
{ |
2351 |
struct ccs_io_buffer *head = file->private_data; |
2352 |
if (!head->poll) |
2353 |
return -ENOSYS; |
2354 |
return head->poll(file, wait); |
2355 |
} |
2356 |
|
2357 |
/** |
2358 |
* ccs_read_control - read() for /proc/ccs/ interface. |
2359 |
* |
2360 |
* @file: Pointer to "struct file". |
2361 |
* @buffer: Poiner to buffer to write to. |
2362 |
* @buffer_len: Size of @buffer. |
2363 |
* |
2364 |
* Returns bytes read on success, negative value otherwise. |
2365 |
*/ |
2366 |
int ccs_read_control(struct file *file, char __user *buffer, |
2367 |
const int buffer_len) |
2368 |
{ |
2369 |
int len = 0; |
2370 |
struct ccs_io_buffer *head = file->private_data; |
2371 |
char *cp; |
2372 |
if (!head->read) |
2373 |
return -ENOSYS; |
2374 |
if (!access_ok(VERIFY_WRITE, buffer, buffer_len)) |
2375 |
return -EFAULT; |
2376 |
if (mutex_lock_interruptible(&head->io_sem)) |
2377 |
return -EINTR; |
2378 |
/* Call the policy handler. */ |
2379 |
len = head->read(head); |
2380 |
if (len < 0) |
2381 |
goto out; |
2382 |
/* Write to buffer. */ |
2383 |
len = head->read_avail; |
2384 |
if (len > buffer_len) |
2385 |
len = buffer_len; |
2386 |
if (!len) |
2387 |
goto out; |
2388 |
/* head->read_buf changes by some functions. */ |
2389 |
cp = head->read_buf; |
2390 |
if (copy_to_user(buffer, cp, len)) { |
2391 |
len = -EFAULT; |
2392 |
goto out; |
2393 |
} |
2394 |
head->read_avail -= len; |
2395 |
memmove(cp, cp + len, head->read_avail); |
2396 |
out: |
2397 |
mutex_unlock(&head->io_sem); |
2398 |
return len; |
2399 |
} |
2400 |
|
2401 |
/** |
2402 |
* ccs_write_control - write() for /proc/ccs/ interface. |
2403 |
* |
2404 |
* @file: Pointer to "struct file". |
2405 |
* @buffer: Pointer to buffer to read from. |
2406 |
* @buffer_len: Size of @buffer. |
2407 |
* |
2408 |
* Returns @buffer_len on success, negative value otherwise. |
2409 |
*/ |
2410 |
int ccs_write_control(struct file *file, const char __user *buffer, |
2411 |
const int buffer_len) |
2412 |
{ |
2413 |
struct ccs_io_buffer *head = file->private_data; |
2414 |
int error = buffer_len; |
2415 |
int avail_len = buffer_len; |
2416 |
char *cp0 = head->write_buf; |
2417 |
if (!head->write) |
2418 |
return -ENOSYS; |
2419 |
if (!access_ok(VERIFY_READ, buffer, buffer_len)) |
2420 |
return -EFAULT; |
2421 |
/* Don't allow updating policies by non manager programs. */ |
2422 |
if (head->write != ccs_write_pid && |
2423 |
head->write != ccs_write_domain_policy && |
2424 |
!ccs_is_policy_manager()) |
2425 |
return -EPERM; |
2426 |
if (mutex_lock_interruptible(&head->io_sem)) |
2427 |
return -EINTR; |
2428 |
/* Read a line and dispatch it to the policy handler. */ |
2429 |
while (avail_len > 0) { |
2430 |
char c; |
2431 |
if (head->write_avail >= head->writebuf_size - 1) { |
2432 |
error = -ENOMEM; |
2433 |
break; |
2434 |
} else if (get_user(c, buffer)) { |
2435 |
error = -EFAULT; |
2436 |
break; |
2437 |
} |
2438 |
buffer++; |
2439 |
avail_len--; |
2440 |
cp0[head->write_avail++] = c; |
2441 |
if (c != '\n') |
2442 |
continue; |
2443 |
cp0[head->write_avail - 1] = '\0'; |
2444 |
head->write_avail = 0; |
2445 |
ccs_normalize_line(cp0); |
2446 |
head->write(head); |
2447 |
} |
2448 |
mutex_unlock(&head->io_sem); |
2449 |
return error; |
2450 |
} |
2451 |
|
2452 |
/** |
2453 |
* ccs_close_control - close() for /proc/ccs/ interface. |
2454 |
* |
2455 |
* @file: Pointer to "struct file". |
2456 |
* |
2457 |
* Releases memory and returns 0. |
2458 |
*/ |
2459 |
int ccs_close_control(struct file *file) |
2460 |
{ |
2461 |
struct ccs_io_buffer *head = file->private_data; |
2462 |
const bool is_write = head->write_buf != NULL; |
2463 |
const u8 type = head->type; |
2464 |
/* |
2465 |
* If the file is /proc/ccs/query , decrement the observer counter. |
2466 |
*/ |
2467 |
if (type == CCS_QUERY) |
2468 |
atomic_dec(&ccs_query_observers); |
2469 |
if (type != CCS_QUERY && |
2470 |
type != CCS_GRANTLOG && type != CCS_REJECTLOG) |
2471 |
ccs_read_unlock(head->reader_idx); |
2472 |
/* Release memory used for policy I/O. */ |
2473 |
kfree(head->read_buf); |
2474 |
head->read_buf = NULL; |
2475 |
kfree(head->write_buf); |
2476 |
head->write_buf = NULL; |
2477 |
kfree(head); |
2478 |
head = NULL; |
2479 |
file->private_data = NULL; |
2480 |
if (is_write) |
2481 |
ccs_run_gc(); |
2482 |
return 0; |
2483 |
} |