1 |
kumaneko |
111 |
/* |
2 |
kumaneko |
2864 |
* security/ccsecurity/domain.c |
3 |
kumaneko |
111 |
* |
4 |
kumaneko |
3360 |
* Copyright (C) 2005-2010 NTT DATA CORPORATION |
5 |
kumaneko |
111 |
* |
6 |
kumaneko |
3701 |
* Version: 1.7.2+ 2010/05/27 |
7 |
kumaneko |
111 |
* |
8 |
|
|
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
9 |
|
|
* See README.ccs for ChangeLog. |
10 |
|
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* |
11 |
|
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*/ |
12 |
|
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|
13 |
kumaneko |
2763 |
#include <linux/slab.h> |
14 |
kumaneko |
115 |
#include <linux/highmem.h> |
15 |
kumaneko |
2763 |
#include <linux/version.h> |
16 |
kumaneko |
1052 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
17 |
|
|
#include <linux/namei.h> |
18 |
|
|
#include <linux/mount.h> |
19 |
|
|
#endif |
20 |
kumaneko |
2402 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) |
21 |
|
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#include <linux/fs_struct.h> |
22 |
|
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#endif |
23 |
kumaneko |
2854 |
#include "internal.h" |
24 |
kumaneko |
115 |
|
25 |
kumaneko |
1052 |
/* Variables definitions.*/ |
26 |
kumaneko |
111 |
|
27 |
kumaneko |
3697 |
/* The global domain. */ |
28 |
|
|
struct ccs_domain_info ccs_global_domain; |
29 |
|
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|
30 |
kumaneko |
111 |
/* The initial domain. */ |
31 |
kumaneko |
2282 |
struct ccs_domain_info ccs_kernel_domain; |
32 |
kumaneko |
111 |
|
33 |
kumaneko |
2282 |
/* The list for "struct ccs_domain_info". */ |
34 |
kumaneko |
2540 |
LIST_HEAD(ccs_domain_list); |
35 |
kumaneko |
708 |
|
36 |
kumaneko |
3689 |
struct list_head ccs_policy_list[CCS_MAX_POLICY]; |
37 |
|
|
struct list_head ccs_group_list[CCS_MAX_GROUP]; |
38 |
|
|
struct list_head ccs_shared_list[CCS_MAX_LIST]; |
39 |
|
|
|
40 |
kumaneko |
1052 |
/** |
41 |
kumaneko |
2002 |
* ccs_audit_execute_handler_log - Audit execute_handler log. |
42 |
kumaneko |
1052 |
* |
43 |
kumaneko |
3693 |
* @ee: Pointer to "struct ccs_execve". |
44 |
kumaneko |
1052 |
* |
45 |
|
|
* Returns 0 on success, negative value otherwise. |
46 |
|
|
*/ |
47 |
kumaneko |
3693 |
static int ccs_audit_execute_handler_log(struct ccs_execve *ee) |
48 |
kumaneko |
1052 |
{ |
49 |
kumaneko |
2037 |
struct ccs_request_info *r = &ee->r; |
50 |
|
|
const char *handler = ee->handler->name; |
51 |
kumaneko |
3626 |
r->type = CCS_MAC_FILE_EXECUTE; |
52 |
kumaneko |
2943 |
r->mode = ccs_get_mode(r->profile, CCS_MAC_FILE_EXECUTE); |
53 |
kumaneko |
3701 |
r->granted = true; |
54 |
|
|
return ccs_write_log(r, "%s %s\n", ee->handler_type == |
55 |
kumaneko |
3694 |
CCS_TYPE_DENIED_EXECUTE_HANDLER ? |
56 |
|
|
CCS_KEYWORD_DENIED_EXECUTE_HANDLER : |
57 |
|
|
CCS_KEYWORD_EXECUTE_HANDLER, handler); |
58 |
kumaneko |
1052 |
} |
59 |
kumaneko |
111 |
|
60 |
kumaneko |
1052 |
/** |
61 |
kumaneko |
2002 |
* ccs_audit_domain_creation_log - Audit domain creation log. |
62 |
kumaneko |
1052 |
* |
63 |
|
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* Returns 0 on success, negative value otherwise. |
64 |
|
|
*/ |
65 |
kumaneko |
3627 |
static int ccs_audit_domain_creation_log(void) |
66 |
kumaneko |
1052 |
{ |
67 |
kumaneko |
1657 |
struct ccs_request_info r; |
68 |
kumaneko |
3627 |
ccs_init_request_info(&r, CCS_MAC_FILE_EXECUTE); |
69 |
kumaneko |
3701 |
r.granted = false; |
70 |
|
|
return ccs_write_log(&r, "use_profile %u\n", r.profile); |
71 |
kumaneko |
1052 |
} |
72 |
|
|
|
73 |
kumaneko |
3689 |
int ccs_update_policy(struct ccs_acl_head *new_entry, const int size, |
74 |
|
|
bool is_delete, const int idx, bool (*check_duplicate) |
75 |
|
|
(const struct ccs_acl_head *, |
76 |
|
|
const struct ccs_acl_head *)) |
77 |
|
|
{ |
78 |
|
|
int error = is_delete ? -ENOENT : -ENOMEM; |
79 |
|
|
struct ccs_acl_head *entry; |
80 |
|
|
if (mutex_lock_interruptible(&ccs_policy_lock)) |
81 |
|
|
return -ENOMEM; |
82 |
|
|
list_for_each_entry_rcu(entry, &ccs_policy_list[idx], list) { |
83 |
|
|
if (!check_duplicate(entry, new_entry)) |
84 |
|
|
continue; |
85 |
|
|
entry->is_deleted = is_delete; |
86 |
|
|
error = 0; |
87 |
|
|
break; |
88 |
|
|
} |
89 |
|
|
if (error && !is_delete) { |
90 |
|
|
entry = ccs_commit_ok(new_entry, size); |
91 |
|
|
if (entry) { |
92 |
|
|
list_add_tail_rcu(&entry->list, &ccs_policy_list[idx]); |
93 |
|
|
error = 0; |
94 |
|
|
} |
95 |
|
|
} |
96 |
|
|
mutex_unlock(&ccs_policy_lock); |
97 |
|
|
return error; |
98 |
|
|
} |
99 |
kumaneko |
111 |
|
100 |
kumaneko |
3689 |
int ccs_update_group(struct ccs_acl_head *new_entry, const int size, |
101 |
|
|
bool is_delete, struct ccs_group *group, |
102 |
|
|
bool (*check_duplicate) (const struct ccs_acl_head *, |
103 |
|
|
const struct ccs_acl_head *)) |
104 |
|
|
{ |
105 |
|
|
int error = is_delete ? -ENOENT : -ENOMEM; |
106 |
|
|
struct ccs_acl_head *entry; |
107 |
|
|
if (mutex_lock_interruptible(&ccs_policy_lock)) |
108 |
|
|
return -ENOMEM; |
109 |
|
|
list_for_each_entry_rcu(entry, &group->member_list, list) { |
110 |
|
|
if (!check_duplicate(entry, new_entry)) |
111 |
|
|
continue; |
112 |
|
|
entry->is_deleted = is_delete; |
113 |
|
|
error = 0; |
114 |
|
|
break; |
115 |
|
|
} |
116 |
|
|
if (!is_delete && error) { |
117 |
|
|
entry = ccs_commit_ok(new_entry, size); |
118 |
|
|
if (entry) { |
119 |
|
|
list_add_tail_rcu(&entry->list, &group->member_list); |
120 |
|
|
error = 0; |
121 |
|
|
} |
122 |
|
|
} |
123 |
|
|
mutex_unlock(&ccs_policy_lock); |
124 |
|
|
return error; |
125 |
|
|
} |
126 |
|
|
|
127 |
kumaneko |
3697 |
static void ccs_delete_type(struct ccs_domain_info *domain, u8 type) |
128 |
|
|
{ |
129 |
|
|
struct ccs_acl_info *ptr; |
130 |
|
|
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
131 |
|
|
if (ptr->type == type) |
132 |
|
|
ptr->is_deleted = true; |
133 |
|
|
} |
134 |
|
|
} |
135 |
|
|
|
136 |
kumaneko |
3693 |
int ccs_update_domain(struct ccs_acl_info *new_entry, const int size, |
137 |
|
|
bool is_delete, struct ccs_domain_info *domain, |
138 |
|
|
bool (*check_duplicate) (const struct ccs_acl_info *, |
139 |
|
|
const struct ccs_acl_info *), |
140 |
|
|
bool (*merge_duplicate) (struct ccs_acl_info *, |
141 |
|
|
struct ccs_acl_info *, |
142 |
|
|
const bool)) |
143 |
kumaneko |
3689 |
{ |
144 |
|
|
int error = is_delete ? -ENOENT : -ENOMEM; |
145 |
|
|
struct ccs_acl_info *entry; |
146 |
kumaneko |
3697 |
/* |
147 |
|
|
* Only one "execute_handler" and "denied_execute_handler" can exist |
148 |
|
|
* in a domain. |
149 |
|
|
*/ |
150 |
|
|
const u8 type = new_entry->type; |
151 |
|
|
const bool exclusive = !is_delete && |
152 |
|
|
(type == CCS_TYPE_EXECUTE_HANDLER || |
153 |
|
|
type == CCS_TYPE_DENIED_EXECUTE_HANDLER); |
154 |
kumaneko |
3689 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
155 |
|
|
return error; |
156 |
|
|
list_for_each_entry_rcu(entry, &domain->acl_info_list, list) { |
157 |
|
|
if (!check_duplicate(entry, new_entry)) |
158 |
|
|
continue; |
159 |
kumaneko |
3697 |
if (exclusive) |
160 |
|
|
ccs_delete_type(domain, type); |
161 |
kumaneko |
3689 |
if (merge_duplicate) |
162 |
|
|
entry->is_deleted = merge_duplicate(entry, new_entry, |
163 |
|
|
is_delete); |
164 |
|
|
else |
165 |
|
|
entry->is_deleted = is_delete; |
166 |
|
|
error = 0; |
167 |
|
|
break; |
168 |
|
|
} |
169 |
|
|
if (error && !is_delete) { |
170 |
|
|
entry = ccs_commit_ok(new_entry, size); |
171 |
|
|
if (entry) { |
172 |
kumaneko |
3697 |
if (exclusive) |
173 |
|
|
ccs_delete_type(domain, type); |
174 |
kumaneko |
3689 |
ccs_add_domain_acl(domain, entry); |
175 |
|
|
error = 0; |
176 |
|
|
} |
177 |
|
|
} |
178 |
|
|
mutex_unlock(&ccs_policy_lock); |
179 |
|
|
return error; |
180 |
|
|
} |
181 |
|
|
|
182 |
kumaneko |
3701 |
void ccs_check_acl(struct ccs_request_info *r, |
183 |
|
|
bool (*check_entry) (const struct ccs_request_info *, |
184 |
|
|
const struct ccs_acl_info *)) |
185 |
|
|
{ |
186 |
|
|
const struct ccs_domain_info *domain = ccs_current_domain(); |
187 |
|
|
struct ccs_acl_info *ptr; |
188 |
|
|
retry: |
189 |
|
|
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
190 |
|
|
if (ptr->is_deleted || ptr->type != r->param_type) |
191 |
|
|
continue; |
192 |
|
|
if (check_entry(r, ptr) && ccs_condition(r, ptr->cond)) { |
193 |
|
|
r->cond = ptr->cond; |
194 |
|
|
r->granted = true; |
195 |
|
|
return; |
196 |
|
|
} |
197 |
|
|
} |
198 |
|
|
if (domain != &ccs_global_domain && !domain->ignore_global && |
199 |
|
|
(r->param_type != CCS_TYPE_PATH_ACL || |
200 |
|
|
r->param.path.operation != CCS_TYPE_READ || |
201 |
|
|
!domain->ignore_global_allow_read) && |
202 |
|
|
(r->param_type != CCS_TYPE_ENV_ACL || |
203 |
|
|
!domain->ignore_global_allow_env)) { |
204 |
|
|
domain = &ccs_global_domain; |
205 |
|
|
goto retry; |
206 |
|
|
} |
207 |
|
|
r->granted = false; |
208 |
|
|
} |
209 |
|
|
|
210 |
kumaneko |
3693 |
static bool ccs_same_domain_initializer_entry(const struct ccs_acl_head *a, |
211 |
kumaneko |
3695 |
const struct ccs_acl_head *b) |
212 |
kumaneko |
3689 |
{ |
213 |
kumaneko |
3695 |
const struct ccs_domain_initializer *p1 = container_of(a, typeof(*p1), |
214 |
|
|
head); |
215 |
|
|
const struct ccs_domain_initializer *p2 = container_of(b, typeof(*p2), |
216 |
|
|
head); |
217 |
kumaneko |
3689 |
return p1->is_not == p2->is_not && p1->is_last_name == p2->is_last_name |
218 |
|
|
&& p1->domainname == p2->domainname |
219 |
|
|
&& p1->program == p2->program; |
220 |
|
|
} |
221 |
|
|
|
222 |
kumaneko |
1052 |
/** |
223 |
kumaneko |
3693 |
* ccs_update_domain_initializer_entry - Update "struct ccs_domain_initializer" list. |
224 |
kumaneko |
1052 |
* |
225 |
|
|
* @domainname: The name of domain. May be NULL. |
226 |
|
|
* @program: The name of program. |
227 |
|
|
* @is_not: True if it is "no_initialize_domain" entry. |
228 |
|
|
* @is_delete: True if it is a delete request. |
229 |
|
|
* |
230 |
|
|
* Returns 0 on success, negative value otherwise. |
231 |
|
|
*/ |
232 |
kumaneko |
2002 |
static int ccs_update_domain_initializer_entry(const char *domainname, |
233 |
|
|
const char *program, |
234 |
|
|
const bool is_not, |
235 |
|
|
const bool is_delete) |
236 |
kumaneko |
111 |
{ |
237 |
kumaneko |
3693 |
struct ccs_domain_initializer e = { .is_not = is_not }; |
238 |
kumaneko |
2540 |
int error = is_delete ? -ENOENT : -ENOMEM; |
239 |
kumaneko |
3693 |
if (!ccs_correct_path(program, 1, -1, -1)) |
240 |
kumaneko |
1052 |
return -EINVAL; /* No patterns allowed. */ |
241 |
kumaneko |
111 |
if (domainname) { |
242 |
kumaneko |
3693 |
if (!ccs_domain_def(domainname) && |
243 |
|
|
ccs_correct_path(domainname, 1, -1, -1)) |
244 |
kumaneko |
2900 |
e.is_last_name = true; |
245 |
kumaneko |
3693 |
else if (!ccs_correct_domain(domainname)) |
246 |
kumaneko |
111 |
return -EINVAL; |
247 |
kumaneko |
2900 |
e.domainname = ccs_get_name(domainname); |
248 |
|
|
if (!e.domainname) |
249 |
|
|
goto out; |
250 |
kumaneko |
111 |
} |
251 |
kumaneko |
2900 |
e.program = ccs_get_name(program); |
252 |
|
|
if (!e.program) |
253 |
|
|
goto out; |
254 |
kumaneko |
3689 |
error = ccs_update_policy(&e.head, sizeof(e), is_delete, |
255 |
|
|
CCS_ID_DOMAIN_INITIALIZER, |
256 |
kumaneko |
3693 |
ccs_same_domain_initializer_entry); |
257 |
kumaneko |
2900 |
out: |
258 |
|
|
ccs_put_name(e.domainname); |
259 |
|
|
ccs_put_name(e.program); |
260 |
kumaneko |
111 |
return error; |
261 |
|
|
} |
262 |
|
|
|
263 |
kumaneko |
1052 |
/** |
264 |
kumaneko |
3693 |
* ccs_write_domain_initializer - Write "struct ccs_domain_initializer" list. |
265 |
kumaneko |
1052 |
* |
266 |
|
|
* @data: String to parse. |
267 |
|
|
* @is_delete: True if it is a delete request. |
268 |
|
|
* |
269 |
|
|
* Returns 0 on success, negative value otherwise. |
270 |
|
|
*/ |
271 |
kumaneko |
3693 |
int ccs_write_domain_initializer(char *data, const bool is_delete, const u8 flags) |
272 |
kumaneko |
111 |
{ |
273 |
kumaneko |
3691 |
char *domainname = strstr(data, " from "); |
274 |
|
|
if (domainname) { |
275 |
|
|
*domainname = '\0'; |
276 |
|
|
domainname += 6; |
277 |
kumaneko |
111 |
} |
278 |
kumaneko |
3691 |
return ccs_update_domain_initializer_entry(domainname, data, flags, |
279 |
kumaneko |
2002 |
is_delete); |
280 |
kumaneko |
111 |
} |
281 |
|
|
|
282 |
kumaneko |
1052 |
/** |
283 |
kumaneko |
3693 |
* ccs_domain_initializer - Check whether the given program causes domainname reinitialization. |
284 |
kumaneko |
1052 |
* |
285 |
|
|
* @domainname: The name of domain. |
286 |
|
|
* @program: The name of program. |
287 |
|
|
* @last_name: The last component of @domainname. |
288 |
|
|
* |
289 |
|
|
* Returns true if executing @program reinitializes domain transition, |
290 |
|
|
* false otherwise. |
291 |
kumaneko |
2690 |
* |
292 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
293 |
kumaneko |
1052 |
*/ |
294 |
kumaneko |
3693 |
static bool ccs_domain_initializer(const struct ccs_path_info *domainname, |
295 |
kumaneko |
2002 |
const struct ccs_path_info *program, |
296 |
|
|
const struct ccs_path_info *last_name) |
297 |
kumaneko |
111 |
{ |
298 |
kumaneko |
3693 |
struct ccs_domain_initializer *ptr; |
299 |
kumaneko |
1016 |
bool flag = false; |
300 |
kumaneko |
3689 |
list_for_each_entry_rcu(ptr, &ccs_policy_list |
301 |
|
|
[CCS_ID_DOMAIN_INITIALIZER], head.list) { |
302 |
|
|
if (ptr->head.is_deleted) |
303 |
kumaneko |
1052 |
continue; |
304 |
kumaneko |
111 |
if (ptr->domainname) { |
305 |
|
|
if (!ptr->is_last_name) { |
306 |
kumaneko |
1052 |
if (ptr->domainname != domainname) |
307 |
|
|
continue; |
308 |
kumaneko |
111 |
} else { |
309 |
kumaneko |
1052 |
if (ccs_pathcmp(ptr->domainname, last_name)) |
310 |
|
|
continue; |
311 |
kumaneko |
111 |
} |
312 |
|
|
} |
313 |
kumaneko |
1052 |
if (ccs_pathcmp(ptr->program, program)) |
314 |
|
|
continue; |
315 |
kumaneko |
2540 |
if (ptr->is_not) { |
316 |
|
|
flag = false; |
317 |
|
|
break; |
318 |
|
|
} |
319 |
kumaneko |
1016 |
flag = true; |
320 |
kumaneko |
111 |
} |
321 |
|
|
return flag; |
322 |
|
|
} |
323 |
|
|
|
324 |
kumaneko |
3693 |
static bool ccs_same_domain_keeper_entry(const struct ccs_acl_head *a, |
325 |
kumaneko |
3695 |
const struct ccs_acl_head *b) |
326 |
kumaneko |
3689 |
{ |
327 |
kumaneko |
3695 |
const struct ccs_domain_keeper *p1 = container_of(a, typeof(*p1), |
328 |
|
|
head); |
329 |
|
|
const struct ccs_domain_keeper *p2 = container_of(b, typeof(*p2), |
330 |
|
|
head); |
331 |
kumaneko |
3689 |
return p1->is_not == p2->is_not && p1->is_last_name == p2->is_last_name |
332 |
|
|
&& p1->domainname == p2->domainname |
333 |
|
|
&& p1->program == p2->program; |
334 |
|
|
} |
335 |
kumaneko |
111 |
|
336 |
kumaneko |
1052 |
/** |
337 |
kumaneko |
3693 |
* ccs_update_domain_keeper_entry - Update "struct ccs_domain_keeper" list. |
338 |
kumaneko |
1052 |
* |
339 |
|
|
* @domainname: The name of domain. |
340 |
|
|
* @program: The name of program. May be NULL. |
341 |
|
|
* @is_not: True if it is "no_keep_domain" entry. |
342 |
|
|
* @is_delete: True if it is a delete request. |
343 |
|
|
* |
344 |
|
|
* Returns 0 on success, negative value otherwise. |
345 |
|
|
*/ |
346 |
kumaneko |
2002 |
static int ccs_update_domain_keeper_entry(const char *domainname, |
347 |
|
|
const char *program, |
348 |
|
|
const bool is_not, |
349 |
|
|
const bool is_delete) |
350 |
kumaneko |
111 |
{ |
351 |
kumaneko |
3693 |
struct ccs_domain_keeper e = { .is_not = is_not }; |
352 |
kumaneko |
2540 |
int error = is_delete ? -ENOENT : -ENOMEM; |
353 |
kumaneko |
3693 |
if (!ccs_domain_def(domainname) && |
354 |
|
|
ccs_correct_path(domainname, 1, -1, -1)) |
355 |
kumaneko |
2900 |
e.is_last_name = true; |
356 |
kumaneko |
3693 |
else if (!ccs_correct_domain(domainname)) |
357 |
kumaneko |
111 |
return -EINVAL; |
358 |
|
|
if (program) { |
359 |
kumaneko |
3693 |
if (!ccs_correct_path(program, 1, -1, -1)) |
360 |
kumaneko |
1052 |
return -EINVAL; |
361 |
kumaneko |
2900 |
e.program = ccs_get_name(program); |
362 |
|
|
if (!e.program) |
363 |
|
|
goto out; |
364 |
kumaneko |
111 |
} |
365 |
kumaneko |
2900 |
e.domainname = ccs_get_name(domainname); |
366 |
|
|
if (!e.domainname) |
367 |
|
|
goto out; |
368 |
kumaneko |
3689 |
error = ccs_update_policy(&e.head, sizeof(e), is_delete, |
369 |
|
|
CCS_ID_DOMAIN_KEEPER, |
370 |
kumaneko |
3693 |
ccs_same_domain_keeper_entry); |
371 |
kumaneko |
2900 |
out: |
372 |
|
|
ccs_put_name(e.domainname); |
373 |
|
|
ccs_put_name(e.program); |
374 |
kumaneko |
111 |
return error; |
375 |
|
|
} |
376 |
|
|
|
377 |
kumaneko |
1052 |
/** |
378 |
kumaneko |
3693 |
* ccs_write_domain_keeper - Write "struct ccs_domain_keeper" list. |
379 |
kumaneko |
1052 |
* |
380 |
|
|
* @data: String to parse. |
381 |
|
|
* @is_delete: True if it is a delete request. |
382 |
|
|
* |
383 |
kumaneko |
3691 |
* Returns 0 on success, negative value otherwise. |
384 |
kumaneko |
1052 |
*/ |
385 |
kumaneko |
3693 |
int ccs_write_domain_keeper(char *data, const bool is_delete, const u8 flags) |
386 |
kumaneko |
111 |
{ |
387 |
kumaneko |
3691 |
char *domainname = strstr(data, " from "); |
388 |
|
|
if (domainname) { |
389 |
|
|
*domainname = '\0'; |
390 |
|
|
domainname += 6; |
391 |
|
|
} else { |
392 |
|
|
domainname = data; |
393 |
|
|
data = NULL; |
394 |
kumaneko |
111 |
} |
395 |
kumaneko |
3691 |
return ccs_update_domain_keeper_entry(domainname, data, flags, |
396 |
|
|
is_delete); |
397 |
kumaneko |
111 |
} |
398 |
|
|
|
399 |
kumaneko |
1052 |
/** |
400 |
kumaneko |
3693 |
* ccs_domain_keeper - Check whether the given program causes domain transition suppression. |
401 |
kumaneko |
1052 |
* |
402 |
|
|
* @domainname: The name of domain. |
403 |
|
|
* @program: The name of program. |
404 |
|
|
* @last_name: The last component of @domainname. |
405 |
|
|
* |
406 |
|
|
* Returns true if executing @program supresses domain transition, |
407 |
|
|
* false otherwise. |
408 |
kumaneko |
2690 |
* |
409 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
410 |
kumaneko |
1052 |
*/ |
411 |
kumaneko |
3693 |
static bool ccs_domain_keeper(const struct ccs_path_info *domainname, |
412 |
kumaneko |
2002 |
const struct ccs_path_info *program, |
413 |
|
|
const struct ccs_path_info *last_name) |
414 |
kumaneko |
111 |
{ |
415 |
kumaneko |
3693 |
struct ccs_domain_keeper *ptr; |
416 |
kumaneko |
1016 |
bool flag = false; |
417 |
kumaneko |
3689 |
list_for_each_entry_rcu(ptr, &ccs_policy_list[CCS_ID_DOMAIN_KEEPER], |
418 |
|
|
head.list) { |
419 |
|
|
if (ptr->head.is_deleted) |
420 |
kumaneko |
1052 |
continue; |
421 |
kumaneko |
111 |
if (!ptr->is_last_name) { |
422 |
kumaneko |
1052 |
if (ptr->domainname != domainname) |
423 |
|
|
continue; |
424 |
kumaneko |
111 |
} else { |
425 |
kumaneko |
1052 |
if (ccs_pathcmp(ptr->domainname, last_name)) |
426 |
|
|
continue; |
427 |
kumaneko |
111 |
} |
428 |
kumaneko |
1052 |
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
429 |
|
|
continue; |
430 |
kumaneko |
2540 |
if (ptr->is_not) { |
431 |
|
|
flag = false; |
432 |
|
|
break; |
433 |
|
|
} |
434 |
kumaneko |
1016 |
flag = true; |
435 |
kumaneko |
111 |
} |
436 |
|
|
return flag; |
437 |
|
|
} |
438 |
|
|
|
439 |
kumaneko |
3693 |
static bool ccs_same_aggregator_entry(const struct ccs_acl_head *a, |
440 |
kumaneko |
3695 |
const struct ccs_acl_head *b) |
441 |
kumaneko |
3689 |
{ |
442 |
kumaneko |
3695 |
const struct ccs_aggregator *p1 = container_of(a, typeof(*p1), head); |
443 |
|
|
const struct ccs_aggregator *p2 = container_of(b, typeof(*p2), head); |
444 |
kumaneko |
3689 |
return p1->original_name == p2->original_name && |
445 |
|
|
p1->aggregated_name == p2->aggregated_name; |
446 |
|
|
} |
447 |
kumaneko |
111 |
|
448 |
kumaneko |
1052 |
/** |
449 |
kumaneko |
3693 |
* ccs_update_aggregator_entry - Update "struct ccs_aggregator" list. |
450 |
kumaneko |
1052 |
* |
451 |
|
|
* @original_name: The original program's name. |
452 |
|
|
* @aggregated_name: The aggregated program's name. |
453 |
|
|
* @is_delete: True if it is a delete request. |
454 |
|
|
* |
455 |
|
|
* Returns 0 on success, negative value otherwise. |
456 |
|
|
*/ |
457 |
kumaneko |
2002 |
static int ccs_update_aggregator_entry(const char *original_name, |
458 |
|
|
const char *aggregated_name, |
459 |
|
|
const bool is_delete) |
460 |
kumaneko |
111 |
{ |
461 |
kumaneko |
3693 |
struct ccs_aggregator e = { }; |
462 |
kumaneko |
2540 |
int error = is_delete ? -ENOENT : -ENOMEM; |
463 |
kumaneko |
3693 |
if (!ccs_correct_path(original_name, 1, 0, -1) || |
464 |
|
|
!ccs_correct_path(aggregated_name, 1, -1, -1)) |
465 |
kumaneko |
1052 |
return -EINVAL; |
466 |
kumaneko |
2900 |
e.original_name = ccs_get_name(original_name); |
467 |
|
|
e.aggregated_name = ccs_get_name(aggregated_name); |
468 |
|
|
if (!e.original_name || !e.aggregated_name) |
469 |
|
|
goto out; |
470 |
kumaneko |
3689 |
error = ccs_update_policy(&e.head, sizeof(e), is_delete, |
471 |
|
|
CCS_ID_AGGREGATOR, |
472 |
kumaneko |
3693 |
ccs_same_aggregator_entry); |
473 |
kumaneko |
2900 |
out: |
474 |
|
|
ccs_put_name(e.original_name); |
475 |
|
|
ccs_put_name(e.aggregated_name); |
476 |
kumaneko |
111 |
return error; |
477 |
|
|
} |
478 |
|
|
|
479 |
kumaneko |
1052 |
/** |
480 |
kumaneko |
3693 |
* ccs_write_aggregator - Write "struct ccs_aggregator" list. |
481 |
kumaneko |
1052 |
* |
482 |
|
|
* @data: String to parse. |
483 |
|
|
* @is_delete: True if it is a delete request. |
484 |
|
|
* |
485 |
|
|
* Returns 0 on success, negative value otherwise. |
486 |
|
|
*/ |
487 |
kumaneko |
3693 |
int ccs_write_aggregator(char *data, const bool is_delete, const u8 flags) |
488 |
kumaneko |
111 |
{ |
489 |
kumaneko |
2779 |
char *w[2]; |
490 |
|
|
if (!ccs_tokenize(data, w, sizeof(w)) || !w[1][0]) |
491 |
kumaneko |
2870 |
return -EINVAL; |
492 |
kumaneko |
2779 |
return ccs_update_aggregator_entry(w[0], w[1], is_delete); |
493 |
kumaneko |
111 |
} |
494 |
|
|
|
495 |
kumaneko |
2393 |
/* Domain create/delete handler. */ |
496 |
kumaneko |
111 |
|
497 |
kumaneko |
1052 |
/** |
498 |
|
|
* ccs_delete_domain - Delete a domain. |
499 |
|
|
* |
500 |
|
|
* @domainname: The name of domain. |
501 |
|
|
* |
502 |
|
|
* Returns 0. |
503 |
|
|
*/ |
504 |
|
|
int ccs_delete_domain(char *domainname) |
505 |
kumaneko |
111 |
{ |
506 |
kumaneko |
2282 |
struct ccs_domain_info *domain; |
507 |
kumaneko |
2002 |
struct ccs_path_info name; |
508 |
kumaneko |
1052 |
name.name = domainname; |
509 |
|
|
ccs_fill_path_info(&name); |
510 |
kumaneko |
3534 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
511 |
|
|
return 0; |
512 |
kumaneko |
111 |
/* Is there an active domain? */ |
513 |
kumaneko |
2690 |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
514 |
kumaneko |
2282 |
/* Never delete ccs_kernel_domain */ |
515 |
|
|
if (domain == &ccs_kernel_domain) |
516 |
kumaneko |
1052 |
continue; |
517 |
|
|
if (domain->is_deleted || |
518 |
|
|
ccs_pathcmp(domain->domainname, &name)) |
519 |
|
|
continue; |
520 |
kumaneko |
2393 |
domain->is_deleted = true; |
521 |
kumaneko |
708 |
break; |
522 |
kumaneko |
111 |
} |
523 |
kumaneko |
2690 |
mutex_unlock(&ccs_policy_lock); |
524 |
kumaneko |
111 |
return 0; |
525 |
|
|
} |
526 |
|
|
|
527 |
kumaneko |
1052 |
/** |
528 |
kumaneko |
3694 |
* ccs_assign_domain - Create a domain. |
529 |
kumaneko |
1052 |
* |
530 |
|
|
* @domainname: The name of domain. |
531 |
|
|
* @profile: Profile number to assign if the domain was newly created. |
532 |
|
|
* |
533 |
kumaneko |
2690 |
* Returns pointer to "struct ccs_domain_info" on success, NULL otherwise. |
534 |
kumaneko |
1052 |
*/ |
535 |
kumaneko |
3694 |
struct ccs_domain_info *ccs_assign_domain(const char *domainname, |
536 |
|
|
const u8 profile) |
537 |
kumaneko |
111 |
{ |
538 |
kumaneko |
3697 |
struct ccs_domain_info e = { }; |
539 |
|
|
struct ccs_domain_info *entry = NULL; |
540 |
kumaneko |
2690 |
bool found = false; |
541 |
kumaneko |
2870 |
|
542 |
kumaneko |
3693 |
if (!ccs_correct_domain(domainname)) |
543 |
kumaneko |
2690 |
return NULL; |
544 |
kumaneko |
3697 |
e.profile = profile; |
545 |
|
|
e.domainname = ccs_get_name(domainname); |
546 |
|
|
if (!e.domainname) |
547 |
kumaneko |
2690 |
return NULL; |
548 |
kumaneko |
3534 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
549 |
|
|
goto out; |
550 |
kumaneko |
3697 |
list_for_each_entry_rcu(entry, &ccs_domain_list, list) { |
551 |
|
|
if (entry->is_deleted || |
552 |
|
|
ccs_pathcmp(e.domainname, entry->domainname)) |
553 |
kumaneko |
2544 |
continue; |
554 |
kumaneko |
2690 |
found = true; |
555 |
kumaneko |
2544 |
break; |
556 |
kumaneko |
111 |
} |
557 |
kumaneko |
3697 |
if (!found) { |
558 |
|
|
entry = ccs_commit_ok(&e, sizeof(e)); |
559 |
|
|
if (entry) { |
560 |
|
|
INIT_LIST_HEAD(&entry->acl_info_list); |
561 |
|
|
list_add_tail_rcu(&entry->list, &ccs_domain_list); |
562 |
|
|
found = true; |
563 |
|
|
} |
564 |
kumaneko |
2544 |
} |
565 |
kumaneko |
2690 |
mutex_unlock(&ccs_policy_lock); |
566 |
kumaneko |
3534 |
out: |
567 |
kumaneko |
3697 |
ccs_put_name(e.domainname); |
568 |
|
|
return found ? entry : NULL; |
569 |
kumaneko |
111 |
} |
570 |
|
|
|
571 |
kumaneko |
1052 |
/** |
572 |
kumaneko |
2002 |
* ccs_find_next_domain - Find a domain. |
573 |
kumaneko |
1052 |
* |
574 |
kumaneko |
3693 |
* @ee: Pointer to "struct ccs_execve". |
575 |
kumaneko |
1052 |
* |
576 |
|
|
* Returns 0 on success, negative value otherwise. |
577 |
kumaneko |
2690 |
* |
578 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
579 |
kumaneko |
1052 |
*/ |
580 |
kumaneko |
3693 |
static int ccs_find_next_domain(struct ccs_execve *ee) |
581 |
kumaneko |
115 |
{ |
582 |
kumaneko |
2037 |
struct ccs_request_info *r = &ee->r; |
583 |
|
|
const struct ccs_path_info *handler = ee->handler; |
584 |
kumaneko |
2691 |
struct ccs_domain_info *domain = NULL; |
585 |
kumaneko |
3627 |
struct ccs_domain_info * const old_domain = ccs_current_domain(); |
586 |
|
|
const char *old_domain_name = old_domain->domainname->name; |
587 |
kumaneko |
2037 |
struct linux_binprm *bprm = ee->bprm; |
588 |
kumaneko |
3627 |
struct task_struct *task = current; |
589 |
|
|
const u32 ccs_flags = task->ccs_flags; |
590 |
kumaneko |
2932 |
struct ccs_path_info rn = { }; /* real name */ |
591 |
kumaneko |
2002 |
struct ccs_path_info ln; /* last name */ |
592 |
kumaneko |
111 |
int retval; |
593 |
kumaneko |
2932 |
bool need_kfree = false; |
594 |
kumaneko |
3627 |
bool domain_created = false; |
595 |
kumaneko |
2943 |
ln.name = ccs_last_word(old_domain_name); |
596 |
|
|
ccs_fill_path_info(&ln); |
597 |
kumaneko |
1561 |
retry: |
598 |
kumaneko |
2282 |
current->ccs_flags = ccs_flags; |
599 |
kumaneko |
2690 |
r->cond = NULL; |
600 |
kumaneko |
2943 |
if (need_kfree) { |
601 |
|
|
kfree(rn.name); |
602 |
|
|
need_kfree = false; |
603 |
|
|
} |
604 |
|
|
|
605 |
kumaneko |
2738 |
/* Get symlink's pathname of program. */ |
606 |
kumaneko |
2932 |
retval = ccs_symlink_path(bprm->filename, &rn); |
607 |
kumaneko |
2075 |
if (retval < 0) |
608 |
kumaneko |
1052 |
goto out; |
609 |
kumaneko |
2932 |
need_kfree = true; |
610 |
kumaneko |
111 |
|
611 |
kumaneko |
1657 |
if (handler) { |
612 |
|
|
if (ccs_pathcmp(&rn, handler)) { |
613 |
kumaneko |
1064 |
/* Failed to verify execute handler. */ |
614 |
kumaneko |
1029 |
static u8 counter = 20; |
615 |
|
|
if (counter) { |
616 |
|
|
counter--; |
617 |
kumaneko |
1052 |
printk(KERN_WARNING "Failed to verify: %s\n", |
618 |
kumaneko |
1657 |
handler->name); |
619 |
kumaneko |
1029 |
} |
620 |
|
|
goto out; |
621 |
|
|
} |
622 |
kumaneko |
2943 |
} else { |
623 |
kumaneko |
3693 |
struct ccs_aggregator *ptr; |
624 |
kumaneko |
2943 |
/* Check 'aggregator' directive. */ |
625 |
kumaneko |
3689 |
list_for_each_entry_rcu(ptr, |
626 |
|
|
&ccs_policy_list[CCS_ID_AGGREGATOR], |
627 |
|
|
head.list) { |
628 |
|
|
if (ptr->head.is_deleted || |
629 |
kumaneko |
1657 |
!ccs_path_matches_pattern(&rn, ptr->original_name)) |
630 |
kumaneko |
1052 |
continue; |
631 |
kumaneko |
2932 |
kfree(rn.name); |
632 |
|
|
need_kfree = false; |
633 |
kumaneko |
2943 |
/* This is OK because it is read only. */ |
634 |
kumaneko |
2932 |
rn = *ptr->aggregated_name; |
635 |
kumaneko |
183 |
break; |
636 |
|
|
} |
637 |
kumaneko |
2943 |
|
638 |
|
|
/* Check execute permission. */ |
639 |
kumaneko |
3701 |
retval = ccs_path_permission(r, CCS_TYPE_EXECUTE, &rn); |
640 |
kumaneko |
3494 |
if (retval == CCS_RETRY_REQUEST) |
641 |
kumaneko |
2943 |
goto retry; |
642 |
|
|
if (retval < 0) |
643 |
|
|
goto out; |
644 |
kumaneko |
183 |
} |
645 |
|
|
|
646 |
kumaneko |
2943 |
/* Calculate domain to transit to. */ |
647 |
kumaneko |
3693 |
if (ccs_domain_initializer(old_domain->domainname, &rn, &ln)) { |
648 |
kumaneko |
2282 |
/* Transit to the child of ccs_kernel_domain domain. */ |
649 |
kumaneko |
2932 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, ROOT_NAME " " "%s", |
650 |
|
|
rn.name); |
651 |
kumaneko |
3627 |
} else if (old_domain == &ccs_kernel_domain && !ccs_policy_loaded) { |
652 |
kumaneko |
111 |
/* |
653 |
kumaneko |
1052 |
* Needn't to transit from kernel domain before starting |
654 |
kumaneko |
1064 |
* /sbin/init. But transit from kernel domain if executing |
655 |
|
|
* initializers because they might start before /sbin/init. |
656 |
kumaneko |
111 |
*/ |
657 |
kumaneko |
3627 |
domain = old_domain; |
658 |
kumaneko |
3693 |
} else if (ccs_domain_keeper(old_domain->domainname, &rn, &ln)) { |
659 |
kumaneko |
111 |
/* Keep current domain. */ |
660 |
kumaneko |
3627 |
domain = old_domain; |
661 |
kumaneko |
111 |
} else { |
662 |
|
|
/* Normal domain transition. */ |
663 |
kumaneko |
2932 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s %s", |
664 |
|
|
old_domain_name, rn.name); |
665 |
kumaneko |
111 |
} |
666 |
kumaneko |
2932 |
if (domain || strlen(ee->tmp) >= CCS_EXEC_TMPSIZE - 10) |
667 |
kumaneko |
1052 |
goto done; |
668 |
kumaneko |
2932 |
domain = ccs_find_domain(ee->tmp); |
669 |
kumaneko |
2690 |
if (domain) |
670 |
kumaneko |
1052 |
goto done; |
671 |
kumaneko |
2958 |
if (r->mode == CCS_CONFIG_ENFORCING) { |
672 |
kumaneko |
2932 |
int error = ccs_supervisor(r, "# wants to create domain\n" |
673 |
|
|
"%s\n", ee->tmp); |
674 |
kumaneko |
3494 |
if (error == CCS_RETRY_REQUEST) |
675 |
kumaneko |
1561 |
goto retry; |
676 |
|
|
if (error < 0) |
677 |
kumaneko |
1052 |
goto done; |
678 |
kumaneko |
1561 |
} |
679 |
kumaneko |
3694 |
domain = ccs_assign_domain(ee->tmp, r->profile); |
680 |
kumaneko |
2690 |
if (domain) |
681 |
kumaneko |
3627 |
domain_created = true; |
682 |
kumaneko |
1052 |
done: |
683 |
kumaneko |
2691 |
if (!domain) { |
684 |
kumaneko |
3258 |
retval = (r->mode == CCS_CONFIG_ENFORCING) ? -EPERM : 0; |
685 |
kumaneko |
3627 |
if (!old_domain->domain_transition_failed) { |
686 |
|
|
old_domain->domain_transition_failed = true; |
687 |
kumaneko |
3701 |
r->granted = false; |
688 |
|
|
ccs_write_log(r, CCS_KEYWORD_TRANSITION_FAILED "\n"); |
689 |
kumaneko |
3694 |
printk(KERN_WARNING |
690 |
|
|
"ERROR: Domain '%s' not defined.\n", ee->tmp); |
691 |
kumaneko |
2691 |
} |
692 |
|
|
} else { |
693 |
kumaneko |
111 |
retval = 0; |
694 |
|
|
} |
695 |
kumaneko |
3627 |
if (!retval && handler) |
696 |
|
|
ccs_audit_execute_handler_log(ee); |
697 |
|
|
/* |
698 |
|
|
* Tell GC that I started execve(). |
699 |
|
|
* Also, tell open_exec() to check read permission. |
700 |
|
|
*/ |
701 |
|
|
task->ccs_flags |= CCS_TASK_IS_IN_EXECVE; |
702 |
|
|
/* |
703 |
|
|
* Make task->ccs_flags visible to GC before changing |
704 |
|
|
* task->ccs_domain_info . |
705 |
|
|
*/ |
706 |
|
|
smp_mb(); |
707 |
|
|
/* |
708 |
|
|
* Proceed to the next domain in order to allow reaching via PID. |
709 |
|
|
* It will be reverted if execve() failed. Reverting is not good. |
710 |
|
|
* But it is better than being unable to reach via PID in interactive |
711 |
|
|
* enforcing mode. |
712 |
|
|
*/ |
713 |
|
|
if (domain) |
714 |
|
|
task->ccs_domain_info = domain; |
715 |
|
|
if (domain_created) |
716 |
|
|
ccs_audit_domain_creation_log(); |
717 |
kumaneko |
1052 |
out: |
718 |
kumaneko |
2932 |
if (need_kfree) |
719 |
|
|
kfree(rn.name); |
720 |
kumaneko |
111 |
return retval; |
721 |
|
|
} |
722 |
|
|
|
723 |
kumaneko |
1052 |
/** |
724 |
kumaneko |
2922 |
* ccs_environ - Check permission for environment variable names. |
725 |
kumaneko |
1052 |
* |
726 |
kumaneko |
3693 |
* @ee: Pointer to "struct ccs_execve". |
727 |
kumaneko |
1052 |
* |
728 |
|
|
* Returns 0 on success, negative value otherwise. |
729 |
|
|
*/ |
730 |
kumaneko |
3693 |
static int ccs_environ(struct ccs_execve *ee) |
731 |
kumaneko |
581 |
{ |
732 |
kumaneko |
2037 |
struct ccs_request_info *r = &ee->r; |
733 |
|
|
struct linux_binprm *bprm = ee->bprm; |
734 |
kumaneko |
3128 |
/* env_page->data is allocated by ccs_dump_page(). */ |
735 |
|
|
struct ccs_page_dump env_page = { }; |
736 |
|
|
char *arg_ptr; /* Size is CCS_EXEC_TMPSIZE bytes */ |
737 |
kumaneko |
581 |
int arg_len = 0; |
738 |
|
|
unsigned long pos = bprm->p; |
739 |
kumaneko |
1064 |
int offset = pos % PAGE_SIZE; |
740 |
kumaneko |
581 |
int argv_count = bprm->argc; |
741 |
|
|
int envp_count = bprm->envc; |
742 |
kumaneko |
1052 |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
743 |
kumaneko |
581 |
int error = -ENOMEM; |
744 |
kumaneko |
3627 |
ee->r.type = CCS_MAC_ENVIRON; |
745 |
|
|
ee->r.mode = ccs_get_mode(ccs_current_domain()->profile, |
746 |
|
|
CCS_MAC_ENVIRON); |
747 |
kumaneko |
1657 |
if (!r->mode || !envp_count) |
748 |
kumaneko |
1052 |
return 0; |
749 |
kumaneko |
3512 |
arg_ptr = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); |
750 |
kumaneko |
3128 |
if (!arg_ptr) |
751 |
|
|
goto out; |
752 |
kumaneko |
581 |
while (error == -ENOMEM) { |
753 |
kumaneko |
3128 |
if (!ccs_dump_page(bprm, pos, &env_page)) |
754 |
kumaneko |
1052 |
goto out; |
755 |
kumaneko |
986 |
pos += PAGE_SIZE - offset; |
756 |
kumaneko |
581 |
/* Read. */ |
757 |
|
|
while (argv_count && offset < PAGE_SIZE) { |
758 |
kumaneko |
3128 |
if (!env_page.data[offset++]) |
759 |
kumaneko |
1052 |
argv_count--; |
760 |
kumaneko |
581 |
} |
761 |
kumaneko |
2037 |
if (argv_count) { |
762 |
|
|
offset = 0; |
763 |
|
|
continue; |
764 |
|
|
} |
765 |
kumaneko |
581 |
while (offset < PAGE_SIZE) { |
766 |
kumaneko |
3128 |
const unsigned char c = env_page.data[offset++]; |
767 |
kumaneko |
2932 |
if (c && arg_len < CCS_EXEC_TMPSIZE - 10) { |
768 |
kumaneko |
581 |
if (c == '=') { |
769 |
|
|
arg_ptr[arg_len++] = '\0'; |
770 |
|
|
} else if (c == '\\') { |
771 |
|
|
arg_ptr[arg_len++] = '\\'; |
772 |
|
|
arg_ptr[arg_len++] = '\\'; |
773 |
|
|
} else if (c > ' ' && c < 127) { |
774 |
|
|
arg_ptr[arg_len++] = c; |
775 |
|
|
} else { |
776 |
|
|
arg_ptr[arg_len++] = '\\'; |
777 |
|
|
arg_ptr[arg_len++] = (c >> 6) + '0'; |
778 |
kumaneko |
1052 |
arg_ptr[arg_len++] |
779 |
|
|
= ((c >> 3) & 7) + '0'; |
780 |
kumaneko |
581 |
arg_ptr[arg_len++] = (c & 7) + '0'; |
781 |
|
|
} |
782 |
|
|
} else { |
783 |
|
|
arg_ptr[arg_len] = '\0'; |
784 |
|
|
} |
785 |
kumaneko |
1052 |
if (c) |
786 |
|
|
continue; |
787 |
kumaneko |
2922 |
if (ccs_env_perm(r, arg_ptr)) { |
788 |
kumaneko |
581 |
error = -EPERM; |
789 |
|
|
break; |
790 |
|
|
} |
791 |
|
|
if (!--envp_count) { |
792 |
|
|
error = 0; |
793 |
|
|
break; |
794 |
|
|
} |
795 |
|
|
arg_len = 0; |
796 |
|
|
} |
797 |
|
|
offset = 0; |
798 |
|
|
} |
799 |
|
|
out: |
800 |
kumaneko |
1657 |
if (r->mode != 3) |
801 |
kumaneko |
1052 |
error = 0; |
802 |
kumaneko |
3128 |
kfree(env_page.data); |
803 |
kumaneko |
3272 |
kfree(arg_ptr); |
804 |
kumaneko |
581 |
return error; |
805 |
|
|
} |
806 |
kumaneko |
111 |
|
807 |
kumaneko |
1052 |
/** |
808 |
kumaneko |
2002 |
* ccs_unescape - Unescape escaped string. |
809 |
kumaneko |
1052 |
* |
810 |
kumaneko |
2075 |
* @dest: String to unescape. |
811 |
kumaneko |
1052 |
* |
812 |
|
|
* Returns nothing. |
813 |
|
|
*/ |
814 |
kumaneko |
2002 |
static void ccs_unescape(unsigned char *dest) |
815 |
kumaneko |
708 |
{ |
816 |
|
|
unsigned char *src = dest; |
817 |
kumaneko |
1064 |
unsigned char c; |
818 |
|
|
unsigned char d; |
819 |
|
|
unsigned char e; |
820 |
kumaneko |
1747 |
while (1) { |
821 |
|
|
c = *src++; |
822 |
|
|
if (!c) |
823 |
|
|
break; |
824 |
kumaneko |
708 |
if (c != '\\') { |
825 |
|
|
*dest++ = c; |
826 |
|
|
continue; |
827 |
|
|
} |
828 |
|
|
c = *src++; |
829 |
|
|
if (c == '\\') { |
830 |
|
|
*dest++ = c; |
831 |
kumaneko |
1052 |
continue; |
832 |
|
|
} |
833 |
|
|
if (c < '0' || c > '3') |
834 |
kumaneko |
708 |
break; |
835 |
kumaneko |
1052 |
d = *src++; |
836 |
|
|
if (d < '0' || d > '7') |
837 |
|
|
break; |
838 |
|
|
e = *src++; |
839 |
|
|
if (e < '0' || e > '7') |
840 |
|
|
break; |
841 |
|
|
*dest++ = ((c - '0') << 6) + ((d - '0') << 3) + (e - '0'); |
842 |
kumaneko |
708 |
} |
843 |
|
|
*dest = '\0'; |
844 |
|
|
} |
845 |
|
|
|
846 |
kumaneko |
1052 |
/** |
847 |
kumaneko |
2002 |
* ccs_root_depth - Get number of directories to strip. |
848 |
kumaneko |
1052 |
* |
849 |
|
|
* @dentry: Pointer to "struct dentry". |
850 |
|
|
* @vfsmnt: Pointer to "struct vfsmount". |
851 |
|
|
* |
852 |
|
|
* Returns number of directories to strip. |
853 |
kumaneko |
1029 |
*/ |
854 |
kumaneko |
3625 |
static int ccs_root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
855 |
kumaneko |
708 |
{ |
856 |
kumaneko |
1029 |
int depth = 0; |
857 |
kumaneko |
1474 |
ccs_realpath_lock(); |
858 |
kumaneko |
1029 |
for (;;) { |
859 |
|
|
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
860 |
|
|
/* Global root? */ |
861 |
kumaneko |
1052 |
if (vfsmnt->mnt_parent == vfsmnt) |
862 |
|
|
break; |
863 |
kumaneko |
1029 |
dentry = vfsmnt->mnt_mountpoint; |
864 |
|
|
vfsmnt = vfsmnt->mnt_parent; |
865 |
|
|
continue; |
866 |
|
|
} |
867 |
|
|
dentry = dentry->d_parent; |
868 |
|
|
depth++; |
869 |
|
|
} |
870 |
kumaneko |
1474 |
ccs_realpath_unlock(); |
871 |
kumaneko |
1052 |
return depth; |
872 |
|
|
} |
873 |
|
|
|
874 |
|
|
/** |
875 |
kumaneko |
2002 |
* ccs_get_root_depth - return the depth of root directory. |
876 |
kumaneko |
1052 |
* |
877 |
|
|
* Returns number of directories to strip. |
878 |
|
|
*/ |
879 |
kumaneko |
2002 |
static int ccs_get_root_depth(void) |
880 |
kumaneko |
1052 |
{ |
881 |
|
|
int depth; |
882 |
|
|
struct dentry *dentry; |
883 |
|
|
struct vfsmount *vfsmnt; |
884 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
885 |
|
|
struct path root; |
886 |
|
|
#endif |
887 |
|
|
read_lock(¤t->fs->lock); |
888 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
889 |
|
|
root = current->fs->root; |
890 |
|
|
path_get(¤t->fs->root); |
891 |
|
|
dentry = root.dentry; |
892 |
|
|
vfsmnt = root.mnt; |
893 |
|
|
#else |
894 |
|
|
dentry = dget(current->fs->root); |
895 |
|
|
vfsmnt = mntget(current->fs->rootmnt); |
896 |
|
|
#endif |
897 |
|
|
read_unlock(¤t->fs->lock); |
898 |
kumaneko |
2002 |
depth = ccs_root_depth(dentry, vfsmnt); |
899 |
kumaneko |
1052 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
900 |
kumaneko |
1029 |
path_put(&root); |
901 |
|
|
#else |
902 |
kumaneko |
1052 |
dput(dentry); |
903 |
|
|
mntput(vfsmnt); |
904 |
kumaneko |
1029 |
#endif |
905 |
|
|
return depth; |
906 |
|
|
} |
907 |
|
|
|
908 |
kumaneko |
1052 |
/** |
909 |
kumaneko |
2002 |
* ccs_try_alt_exec - Try to start execute handler. |
910 |
kumaneko |
1052 |
* |
911 |
kumaneko |
3693 |
* @ee: Pointer to "struct ccs_execve". |
912 |
kumaneko |
1052 |
* |
913 |
|
|
* Returns 0 on success, negative value otherwise. |
914 |
|
|
*/ |
915 |
kumaneko |
3693 |
static int ccs_try_alt_exec(struct ccs_execve *ee) |
916 |
kumaneko |
1029 |
{ |
917 |
kumaneko |
1005 |
/* |
918 |
|
|
* Contents of modified bprm. |
919 |
|
|
* The envp[] in original bprm is moved to argv[] so that |
920 |
|
|
* the alternatively executed program won't be affected by |
921 |
kumaneko |
1064 |
* some dangerous environment variables like LD_PRELOAD. |
922 |
kumaneko |
1005 |
* |
923 |
|
|
* modified bprm->argc |
924 |
|
|
* = original bprm->argc + original bprm->envc + 7 |
925 |
|
|
* modified bprm->envc |
926 |
|
|
* = 0 |
927 |
|
|
* |
928 |
|
|
* modified bprm->argv[0] |
929 |
kumaneko |
1029 |
* = the program's name specified by execute_handler |
930 |
kumaneko |
1005 |
* modified bprm->argv[1] |
931 |
kumaneko |
2282 |
* = ccs_current_domain()->domainname->name |
932 |
kumaneko |
1005 |
* modified bprm->argv[2] |
933 |
|
|
* = the current process's name |
934 |
|
|
* modified bprm->argv[3] |
935 |
|
|
* = the current process's information (e.g. uid/gid). |
936 |
|
|
* modified bprm->argv[4] |
937 |
|
|
* = original bprm->filename |
938 |
|
|
* modified bprm->argv[5] |
939 |
|
|
* = original bprm->argc in string expression |
940 |
|
|
* modified bprm->argv[6] |
941 |
|
|
* = original bprm->envc in string expression |
942 |
|
|
* modified bprm->argv[7] |
943 |
|
|
* = original bprm->argv[0] |
944 |
|
|
* ... |
945 |
|
|
* modified bprm->argv[bprm->argc + 6] |
946 |
|
|
* = original bprm->argv[bprm->argc - 1] |
947 |
|
|
* modified bprm->argv[bprm->argc + 7] |
948 |
|
|
* = original bprm->envp[0] |
949 |
|
|
* ... |
950 |
|
|
* modified bprm->argv[bprm->envc + bprm->argc + 6] |
951 |
|
|
* = original bprm->envp[bprm->envc - 1] |
952 |
|
|
*/ |
953 |
kumaneko |
2037 |
struct linux_binprm *bprm = ee->bprm; |
954 |
kumaneko |
708 |
struct file *filp; |
955 |
|
|
int retval; |
956 |
kumaneko |
1005 |
const int original_argc = bprm->argc; |
957 |
|
|
const int original_envc = bprm->envc; |
958 |
|
|
struct task_struct *task = current; |
959 |
kumaneko |
1032 |
|
960 |
kumaneko |
1029 |
/* Close the requested program's dentry. */ |
961 |
kumaneko |
3064 |
ee->obj.path1.dentry = NULL; |
962 |
|
|
ee->obj.path1.mnt = NULL; |
963 |
|
|
ee->obj.validate_done = false; |
964 |
kumaneko |
708 |
allow_write_access(bprm->file); |
965 |
|
|
fput(bprm->file); |
966 |
|
|
bprm->file = NULL; |
967 |
kumaneko |
1005 |
|
968 |
kumaneko |
2037 |
/* Invalidate page dump cache. */ |
969 |
|
|
ee->dump.page = NULL; |
970 |
kumaneko |
1029 |
|
971 |
kumaneko |
1005 |
/* Move envp[] to argv[] */ |
972 |
|
|
bprm->argc += bprm->envc; |
973 |
|
|
bprm->envc = 0; |
974 |
|
|
|
975 |
|
|
/* Set argv[6] */ |
976 |
|
|
{ |
977 |
kumaneko |
2037 |
char *cp = ee->tmp; |
978 |
|
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_envc); |
979 |
|
|
retval = copy_strings_kernel(1, &cp, bprm); |
980 |
kumaneko |
1052 |
if (retval < 0) |
981 |
|
|
goto out; |
982 |
kumaneko |
1005 |
bprm->argc++; |
983 |
|
|
} |
984 |
|
|
|
985 |
|
|
/* Set argv[5] */ |
986 |
|
|
{ |
987 |
kumaneko |
2037 |
char *cp = ee->tmp; |
988 |
|
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_argc); |
989 |
|
|
retval = copy_strings_kernel(1, &cp, bprm); |
990 |
kumaneko |
1052 |
if (retval < 0) |
991 |
|
|
goto out; |
992 |
kumaneko |
1005 |
bprm->argc++; |
993 |
|
|
} |
994 |
|
|
|
995 |
|
|
/* Set argv[4] */ |
996 |
|
|
{ |
997 |
kumaneko |
2075 |
retval = copy_strings_kernel(1, &bprm->filename, bprm); |
998 |
kumaneko |
1052 |
if (retval < 0) |
999 |
|
|
goto out; |
1000 |
kumaneko |
1005 |
bprm->argc++; |
1001 |
|
|
} |
1002 |
|
|
|
1003 |
|
|
/* Set argv[3] */ |
1004 |
|
|
{ |
1005 |
kumaneko |
2037 |
char *cp = ee->tmp; |
1006 |
kumaneko |
2282 |
const u32 ccs_flags = task->ccs_flags; |
1007 |
kumaneko |
2037 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, |
1008 |
kumaneko |
1052 |
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
1009 |
|
|
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
1010 |
|
|
"state[1]=%u state[2]=%u", |
1011 |
kumaneko |
3502 |
(pid_t) ccsecurity_exports.sys_getpid(), |
1012 |
|
|
current_uid(), current_gid(), current_euid(), |
1013 |
|
|
current_egid(), current_suid(), current_sgid(), |
1014 |
|
|
current_fsuid(), current_fsgid(), |
1015 |
kumaneko |
2282 |
(u8) (ccs_flags >> 24), (u8) (ccs_flags >> 16), |
1016 |
|
|
(u8) (ccs_flags >> 8)); |
1017 |
kumaneko |
2037 |
retval = copy_strings_kernel(1, &cp, bprm); |
1018 |
kumaneko |
1052 |
if (retval < 0) |
1019 |
|
|
goto out; |
1020 |
kumaneko |
1005 |
bprm->argc++; |
1021 |
|
|
} |
1022 |
|
|
|
1023 |
|
|
/* Set argv[2] */ |
1024 |
|
|
{ |
1025 |
kumaneko |
1052 |
char *exe = (char *) ccs_get_exe(); |
1026 |
kumaneko |
1005 |
if (exe) { |
1027 |
|
|
retval = copy_strings_kernel(1, &exe, bprm); |
1028 |
kumaneko |
2711 |
kfree(exe); |
1029 |
kumaneko |
1005 |
} else { |
1030 |
kumaneko |
2037 |
exe = ee->tmp; |
1031 |
kumaneko |
2932 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "<unknown>"); |
1032 |
kumaneko |
2037 |
retval = copy_strings_kernel(1, &exe, bprm); |
1033 |
kumaneko |
1005 |
} |
1034 |
kumaneko |
1052 |
if (retval < 0) |
1035 |
|
|
goto out; |
1036 |
kumaneko |
1005 |
bprm->argc++; |
1037 |
|
|
} |
1038 |
|
|
|
1039 |
|
|
/* Set argv[1] */ |
1040 |
|
|
{ |
1041 |
kumaneko |
2037 |
char *cp = ee->tmp; |
1042 |
kumaneko |
2932 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s", |
1043 |
|
|
ccs_current_domain()->domainname->name); |
1044 |
kumaneko |
2037 |
retval = copy_strings_kernel(1, &cp, bprm); |
1045 |
kumaneko |
1052 |
if (retval < 0) |
1046 |
|
|
goto out; |
1047 |
kumaneko |
1005 |
bprm->argc++; |
1048 |
|
|
} |
1049 |
|
|
|
1050 |
|
|
/* Set argv[0] */ |
1051 |
|
|
{ |
1052 |
kumaneko |
2037 |
int depth = ccs_get_root_depth(); |
1053 |
kumaneko |
2932 |
int len = ee->handler->total_len + 1; |
1054 |
kumaneko |
3512 |
char *cp = kmalloc(len, CCS_GFP_FLAGS); |
1055 |
kumaneko |
2932 |
if (!cp) { |
1056 |
kumaneko |
2998 |
retval = -ENOMEM; |
1057 |
kumaneko |
2932 |
goto out; |
1058 |
|
|
} |
1059 |
|
|
ee->handler_path = cp; |
1060 |
|
|
memmove(cp, ee->handler->name, len); |
1061 |
kumaneko |
2037 |
ccs_unescape(cp); |
1062 |
|
|
retval = -ENOENT; |
1063 |
|
|
if (!*cp || *cp != '/') |
1064 |
|
|
goto out; |
1065 |
|
|
/* Adjust root directory for open_exec(). */ |
1066 |
|
|
while (depth) { |
1067 |
|
|
cp = strchr(cp + 1, '/'); |
1068 |
|
|
if (!cp) |
1069 |
|
|
goto out; |
1070 |
|
|
depth--; |
1071 |
|
|
} |
1072 |
kumaneko |
2932 |
memmove(ee->handler_path, cp, strlen(cp) + 1); |
1073 |
|
|
cp = ee->handler_path; |
1074 |
kumaneko |
2037 |
retval = copy_strings_kernel(1, &cp, bprm); |
1075 |
kumaneko |
1052 |
if (retval < 0) |
1076 |
|
|
goto out; |
1077 |
kumaneko |
1005 |
bprm->argc++; |
1078 |
|
|
} |
1079 |
kumaneko |
1052 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
1080 |
|
|
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) |
1081 |
kumaneko |
1007 |
bprm->argv_len = bprm->exec - bprm->p; |
1082 |
|
|
#endif |
1083 |
kumaneko |
1052 |
#endif |
1084 |
kumaneko |
1005 |
|
1085 |
kumaneko |
3625 |
/* |
1086 |
|
|
* OK, now restart the process with execute handler program's dentry. |
1087 |
|
|
*/ |
1088 |
kumaneko |
2932 |
filp = open_exec(ee->handler_path); |
1089 |
kumaneko |
1005 |
if (IS_ERR(filp)) { |
1090 |
|
|
retval = PTR_ERR(filp); |
1091 |
|
|
goto out; |
1092 |
|
|
} |
1093 |
kumaneko |
3064 |
ee->obj.path1.dentry = filp->f_dentry; |
1094 |
|
|
ee->obj.path1.mnt = filp->f_vfsmnt; |
1095 |
kumaneko |
1052 |
bprm->file = filp; |
1096 |
kumaneko |
2932 |
bprm->filename = ee->handler_path; |
1097 |
kumaneko |
1052 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1098 |
kumaneko |
2076 |
bprm->interp = bprm->filename; |
1099 |
kumaneko |
708 |
#endif |
1100 |
kumaneko |
1029 |
retval = prepare_binprm(bprm); |
1101 |
kumaneko |
1052 |
if (retval < 0) |
1102 |
|
|
goto out; |
1103 |
kumaneko |
2932 |
task->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1104 |
|
|
retval = ccs_find_next_domain(ee); |
1105 |
|
|
task->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1106 |
kumaneko |
1005 |
out: |
1107 |
|
|
return retval; |
1108 |
kumaneko |
708 |
} |
1109 |
kumaneko |
581 |
|
1110 |
kumaneko |
1052 |
/** |
1111 |
kumaneko |
2002 |
* ccs_find_execute_handler - Find an execute handler. |
1112 |
kumaneko |
1052 |
* |
1113 |
kumaneko |
3693 |
* @ee: Pointer to "struct ccs_execve". |
1114 |
kumaneko |
1052 |
* @type: Type of execute handler. |
1115 |
|
|
* |
1116 |
kumaneko |
2075 |
* Returns true if found, false otherwise. |
1117 |
kumaneko |
2690 |
* |
1118 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
1119 |
kumaneko |
1052 |
*/ |
1120 |
kumaneko |
3697 |
static bool ccs_find_execute_handler(struct ccs_execve *ee, const u8 type) |
1121 |
kumaneko |
1029 |
{ |
1122 |
kumaneko |
1064 |
struct task_struct *task = current; |
1123 |
kumaneko |
3627 |
const struct ccs_domain_info * const domain = ccs_current_domain(); |
1124 |
kumaneko |
2002 |
struct ccs_acl_info *ptr; |
1125 |
kumaneko |
2540 |
bool found = false; |
1126 |
kumaneko |
1064 |
/* |
1127 |
|
|
* Don't use execute handler if the current process is |
1128 |
|
|
* marked as execute handler to avoid infinite execute handler loop. |
1129 |
|
|
*/ |
1130 |
kumaneko |
2282 |
if (task->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER) |
1131 |
kumaneko |
2037 |
return false; |
1132 |
kumaneko |
3697 |
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
1133 |
|
|
struct ccs_execute_handler *acl; |
1134 |
kumaneko |
1058 |
if (ptr->type != type) |
1135 |
kumaneko |
1052 |
continue; |
1136 |
kumaneko |
3697 |
acl = container_of(ptr, struct ccs_execute_handler, head); |
1137 |
kumaneko |
2037 |
ee->handler = acl->handler; |
1138 |
kumaneko |
3627 |
ee->handler_type = type; |
1139 |
kumaneko |
2540 |
found = true; |
1140 |
|
|
break; |
1141 |
kumaneko |
1029 |
} |
1142 |
kumaneko |
2540 |
return found; |
1143 |
kumaneko |
1029 |
} |
1144 |
|
|
|
1145 |
kumaneko |
1052 |
/** |
1146 |
kumaneko |
2037 |
* ccs_dump_page - Dump a page to buffer. |
1147 |
kumaneko |
1657 |
* |
1148 |
kumaneko |
2037 |
* @bprm: Pointer to "struct linux_binprm". |
1149 |
|
|
* @pos: Location to dump. |
1150 |
|
|
* @dump: Poiner to "struct ccs_page_dump". |
1151 |
kumaneko |
1657 |
* |
1152 |
kumaneko |
2037 |
* Returns true on success, false otherwise. |
1153 |
kumaneko |
1657 |
*/ |
1154 |
kumaneko |
2037 |
bool ccs_dump_page(struct linux_binprm *bprm, unsigned long pos, |
1155 |
|
|
struct ccs_page_dump *dump) |
1156 |
kumaneko |
1657 |
{ |
1157 |
kumaneko |
2037 |
struct page *page; |
1158 |
kumaneko |
3056 |
/* dump->data is released by ccs_finish_execve(). */ |
1159 |
kumaneko |
2037 |
if (!dump->data) { |
1160 |
kumaneko |
3512 |
dump->data = kzalloc(PAGE_SIZE, CCS_GFP_FLAGS); |
1161 |
kumaneko |
2037 |
if (!dump->data) |
1162 |
|
|
return false; |
1163 |
|
|
} |
1164 |
|
|
/* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ |
1165 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1166 |
|
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1167 |
|
|
return false; |
1168 |
kumaneko |
2996 |
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR >= 3 && defined(CONFIG_MMU) |
1169 |
kumaneko |
2346 |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1170 |
|
|
return false; |
1171 |
kumaneko |
3018 |
#elif defined(AX_MAJOR) && AX_MAJOR == 3 && defined(AX_MINOR) && AX_MINOR >= 2 && defined(CONFIG_MMU) |
1172 |
|
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1173 |
|
|
return false; |
1174 |
kumaneko |
2037 |
#else |
1175 |
|
|
page = bprm->page[pos / PAGE_SIZE]; |
1176 |
|
|
#endif |
1177 |
|
|
if (page != dump->page) { |
1178 |
|
|
const unsigned int offset = pos % PAGE_SIZE; |
1179 |
|
|
/* |
1180 |
|
|
* Maybe kmap()/kunmap() should be used here. |
1181 |
|
|
* But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). |
1182 |
|
|
* So do I. |
1183 |
|
|
*/ |
1184 |
|
|
char *kaddr = kmap_atomic(page, KM_USER0); |
1185 |
|
|
dump->page = page; |
1186 |
kumaneko |
3625 |
memcpy(dump->data + offset, kaddr + offset, |
1187 |
|
|
PAGE_SIZE - offset); |
1188 |
kumaneko |
2037 |
kunmap_atomic(kaddr, KM_USER0); |
1189 |
|
|
} |
1190 |
|
|
/* Same with put_arg_page(page) in fs/exec.c */ |
1191 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1192 |
|
|
put_page(page); |
1193 |
kumaneko |
2996 |
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR >= 3 && defined(CONFIG_MMU) |
1194 |
kumaneko |
2346 |
put_page(page); |
1195 |
kumaneko |
3018 |
#elif defined(AX_MAJOR) && AX_MAJOR == 3 && defined(AX_MINOR) && AX_MINOR >= 2 && defined(CONFIG_MMU) |
1196 |
|
|
put_page(page); |
1197 |
kumaneko |
2037 |
#endif |
1198 |
|
|
return true; |
1199 |
kumaneko |
1657 |
} |
1200 |
|
|
|
1201 |
|
|
/** |
1202 |
kumaneko |
2037 |
* ccs_start_execve - Prepare for execve() operation. |
1203 |
kumaneko |
1052 |
* |
1204 |
|
|
* @bprm: Pointer to "struct linux_binprm". |
1205 |
kumaneko |
3693 |
* @eep: Pointer to "struct ccs_execve *". |
1206 |
kumaneko |
1052 |
* |
1207 |
kumaneko |
2037 |
* Returns 0 on success, negative value otherwise. |
1208 |
kumaneko |
1052 |
*/ |
1209 |
kumaneko |
3502 |
static int ccs_start_execve(struct linux_binprm *bprm, |
1210 |
kumaneko |
3693 |
struct ccs_execve **eep) |
1211 |
kumaneko |
115 |
{ |
1212 |
kumaneko |
1657 |
int retval; |
1213 |
kumaneko |
1029 |
struct task_struct *task = current; |
1214 |
kumaneko |
3693 |
struct ccs_execve *ee; |
1215 |
kumaneko |
3056 |
*eep = NULL; |
1216 |
kumaneko |
3512 |
ee = kzalloc(sizeof(*ee), CCS_GFP_FLAGS); |
1217 |
kumaneko |
2037 |
if (!ee) |
1218 |
kumaneko |
1052 |
return -ENOMEM; |
1219 |
kumaneko |
3512 |
ee->tmp = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); |
1220 |
kumaneko |
3056 |
if (!ee->tmp) { |
1221 |
|
|
kfree(ee); |
1222 |
|
|
return -ENOMEM; |
1223 |
|
|
} |
1224 |
|
|
ee->reader_idx = ccs_read_lock(); |
1225 |
|
|
/* ee->dump->data is allocated by ccs_dump_page(). */ |
1226 |
|
|
ee->previous_domain = task->ccs_domain_info; |
1227 |
|
|
/* Clear manager flag. */ |
1228 |
kumaneko |
3693 |
task->ccs_flags &= ~CCS_TASK_IS_MANAGER; |
1229 |
kumaneko |
3056 |
*eep = ee; |
1230 |
kumaneko |
3627 |
ccs_init_request_info(&ee->r, CCS_MAC_FILE_EXECUTE); |
1231 |
kumaneko |
2037 |
ee->r.ee = ee; |
1232 |
|
|
ee->bprm = bprm; |
1233 |
|
|
ee->r.obj = &ee->obj; |
1234 |
kumaneko |
2915 |
ee->obj.path1.dentry = bprm->file->f_dentry; |
1235 |
|
|
ee->obj.path1.mnt = bprm->file->f_vfsmnt; |
1236 |
kumaneko |
3627 |
/* |
1237 |
|
|
* No need to call ccs_environ() for execute handler because envp[] is |
1238 |
|
|
* moved to argv[]. |
1239 |
|
|
*/ |
1240 |
|
|
if (ccs_find_execute_handler(ee, CCS_TYPE_EXECUTE_HANDLER)) |
1241 |
|
|
return ccs_try_alt_exec(ee); |
1242 |
kumaneko |
2037 |
retval = ccs_find_next_domain(ee); |
1243 |
kumaneko |
3627 |
if (retval == -EPERM) { |
1244 |
|
|
if (ccs_find_execute_handler(ee, |
1245 |
|
|
CCS_TYPE_DENIED_EXECUTE_HANDLER)) |
1246 |
|
|
return ccs_try_alt_exec(ee); |
1247 |
kumaneko |
1052 |
} |
1248 |
kumaneko |
3627 |
if (!retval) |
1249 |
|
|
retval = ccs_environ(ee); |
1250 |
kumaneko |
2037 |
return retval; |
1251 |
|
|
} |
1252 |
|
|
|
1253 |
|
|
/** |
1254 |
|
|
* ccs_finish_execve - Clean up execve() operation. |
1255 |
kumaneko |
2076 |
* |
1256 |
|
|
* @retval: Return code of an execve() operation. |
1257 |
kumaneko |
3693 |
* @ee: Pointer to "struct ccs_execve". |
1258 |
kumaneko |
2690 |
* |
1259 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
1260 |
kumaneko |
2037 |
*/ |
1261 |
kumaneko |
3693 |
static void ccs_finish_execve(int retval, struct ccs_execve *ee) |
1262 |
kumaneko |
2037 |
{ |
1263 |
|
|
struct task_struct *task = current; |
1264 |
|
|
if (!ee) |
1265 |
|
|
return; |
1266 |
kumaneko |
2968 |
if (retval < 0) { |
1267 |
|
|
task->ccs_domain_info = ee->previous_domain; |
1268 |
kumaneko |
3056 |
/* |
1269 |
|
|
* Make task->ccs_domain_info visible to GC before changing |
1270 |
|
|
* task->ccs_flags . |
1271 |
|
|
*/ |
1272 |
|
|
smp_mb(); |
1273 |
|
|
} else { |
1274 |
|
|
/* Mark the current process as execute handler. */ |
1275 |
|
|
if (ee->handler) |
1276 |
|
|
task->ccs_flags |= CCS_TASK_IS_EXECUTE_HANDLER; |
1277 |
|
|
/* Mark the current process as normal process. */ |
1278 |
|
|
else |
1279 |
|
|
task->ccs_flags &= ~CCS_TASK_IS_EXECUTE_HANDLER; |
1280 |
kumaneko |
2968 |
} |
1281 |
kumaneko |
3056 |
/* Tell GC that I finished execve(). */ |
1282 |
|
|
task->ccs_flags &= ~CCS_TASK_IS_IN_EXECVE; |
1283 |
|
|
ccs_read_unlock(ee->reader_idx); |
1284 |
|
|
kfree(ee->handler_path); |
1285 |
|
|
kfree(ee->tmp); |
1286 |
|
|
kfree(ee->dump.data); |
1287 |
|
|
kfree(ee); |
1288 |
kumaneko |
115 |
} |
1289 |
kumaneko |
3484 |
|
1290 |
|
|
/** |
1291 |
|
|
* ccs_may_transit - Check permission and do domain transition without execve(). |
1292 |
|
|
* |
1293 |
|
|
* @domainname: Domainname to transit to. |
1294 |
|
|
* @pathname: Pathname to check. |
1295 |
|
|
* |
1296 |
|
|
* Returns 0 on success, negative value otherwise. |
1297 |
|
|
* |
1298 |
|
|
* Caller holds ccs_read_lock(). |
1299 |
|
|
*/ |
1300 |
kumaneko |
3512 |
int ccs_may_transit(const char *domainname, const char *pathname) |
1301 |
|
|
{ |
1302 |
kumaneko |
3484 |
struct ccs_path_info name; |
1303 |
|
|
struct ccs_request_info r; |
1304 |
|
|
struct ccs_domain_info *domain; |
1305 |
|
|
int error; |
1306 |
kumaneko |
3627 |
bool domain_created = false; |
1307 |
kumaneko |
3484 |
name.name = pathname; |
1308 |
|
|
ccs_fill_path_info(&name); |
1309 |
|
|
/* Check allow_transit permission. */ |
1310 |
kumaneko |
3627 |
ccs_init_request_info(&r, CCS_MAC_FILE_TRANSIT); |
1311 |
kumaneko |
3484 |
error = ccs_path_permission(&r, CCS_TYPE_TRANSIT, &name); |
1312 |
|
|
if (error) |
1313 |
|
|
return error; |
1314 |
|
|
/* Check destination domain. */ |
1315 |
|
|
domain = ccs_find_domain(domainname); |
1316 |
|
|
if (!domain && r.mode != CCS_CONFIG_ENFORCING && |
1317 |
|
|
strlen(domainname) < CCS_EXEC_TMPSIZE - 10) { |
1318 |
kumaneko |
3694 |
domain = ccs_assign_domain(domainname, r.profile); |
1319 |
kumaneko |
3484 |
if (domain) |
1320 |
kumaneko |
3627 |
domain_created = true; |
1321 |
kumaneko |
3484 |
} |
1322 |
|
|
if (domain) { |
1323 |
|
|
error = 0; |
1324 |
|
|
current->ccs_domain_info = domain; |
1325 |
kumaneko |
3627 |
if (domain_created) |
1326 |
|
|
ccs_audit_domain_creation_log(); |
1327 |
kumaneko |
3484 |
} else { |
1328 |
|
|
error = -ENOENT; |
1329 |
|
|
} |
1330 |
|
|
return error; |
1331 |
|
|
} |
1332 |
kumaneko |
3502 |
|
1333 |
|
|
static int __ccs_search_binary_handler(struct linux_binprm *bprm, |
1334 |
|
|
struct pt_regs *regs) |
1335 |
|
|
{ |
1336 |
kumaneko |
3693 |
struct ccs_execve *ee; |
1337 |
kumaneko |
3502 |
int retval; |
1338 |
|
|
if (!ccs_policy_loaded) |
1339 |
|
|
ccsecurity_exports.load_policy(bprm->filename); |
1340 |
|
|
retval = ccs_start_execve(bprm, &ee); |
1341 |
|
|
if (!retval) |
1342 |
|
|
retval = search_binary_handler(bprm, regs); |
1343 |
|
|
ccs_finish_execve(retval, ee); |
1344 |
|
|
return retval; |
1345 |
|
|
} |
1346 |
|
|
|
1347 |
|
|
void __init ccs_domain_init(void) |
1348 |
|
|
{ |
1349 |
|
|
ccsecurity_ops.search_binary_handler = __ccs_search_binary_handler; |
1350 |
|
|
} |