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 |
3560 |
* Version: 1.7.2-rc 2010/03/31 |
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 |
|
|
* |
11 |
|
|
*/ |
12 |
|
|
|
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 |
|
|
#include <linux/fs_struct.h> |
22 |
|
|
#endif |
23 |
kumaneko |
2854 |
#include "internal.h" |
24 |
kumaneko |
115 |
|
25 |
kumaneko |
1052 |
/* Variables definitions.*/ |
26 |
kumaneko |
111 |
|
27 |
|
|
/* The initial domain. */ |
28 |
kumaneko |
2282 |
struct ccs_domain_info ccs_kernel_domain; |
29 |
kumaneko |
111 |
|
30 |
kumaneko |
2282 |
/* The list for "struct ccs_domain_info". */ |
31 |
kumaneko |
2540 |
LIST_HEAD(ccs_domain_list); |
32 |
kumaneko |
708 |
|
33 |
kumaneko |
1052 |
/** |
34 |
kumaneko |
2002 |
* ccs_audit_execute_handler_log - Audit execute_handler log. |
35 |
kumaneko |
1052 |
* |
36 |
kumaneko |
2037 |
* @ee: Pointer to "struct ccs_execve_entry". |
37 |
kumaneko |
1064 |
* @is_default: True if it is "execute_handler" log. |
38 |
kumaneko |
1052 |
* |
39 |
|
|
* Returns 0 on success, negative value otherwise. |
40 |
|
|
*/ |
41 |
kumaneko |
2037 |
static int ccs_audit_execute_handler_log(struct ccs_execve_entry *ee, |
42 |
|
|
const bool is_default) |
43 |
kumaneko |
1052 |
{ |
44 |
kumaneko |
3360 |
int error; |
45 |
kumaneko |
2037 |
struct ccs_request_info *r = &ee->r; |
46 |
kumaneko |
3360 |
struct ccs_domain_info *domain = r->domain; |
47 |
kumaneko |
2037 |
const char *handler = ee->handler->name; |
48 |
kumaneko |
2943 |
r->mode = ccs_get_mode(r->profile, CCS_MAC_FILE_EXECUTE); |
49 |
kumaneko |
3360 |
r->domain = ee->previous_domain; |
50 |
|
|
error = ccs_write_audit_log(true, r, "%s %s\n", |
51 |
|
|
is_default ? CCS_KEYWORD_EXECUTE_HANDLER : |
52 |
|
|
CCS_KEYWORD_DENIED_EXECUTE_HANDLER, |
53 |
|
|
handler); |
54 |
|
|
r->domain = domain; |
55 |
|
|
return error; |
56 |
kumaneko |
1052 |
} |
57 |
kumaneko |
111 |
|
58 |
kumaneko |
1052 |
/** |
59 |
kumaneko |
2002 |
* ccs_audit_domain_creation_log - Audit domain creation log. |
60 |
kumaneko |
1052 |
* |
61 |
kumaneko |
2282 |
* @domain: Pointer to "struct ccs_domain_info". |
62 |
kumaneko |
1052 |
* |
63 |
|
|
* Returns 0 on success, negative value otherwise. |
64 |
|
|
*/ |
65 |
kumaneko |
2282 |
static int ccs_audit_domain_creation_log(struct ccs_domain_info *domain) |
66 |
kumaneko |
1052 |
{ |
67 |
kumaneko |
1657 |
struct ccs_request_info r; |
68 |
kumaneko |
2943 |
ccs_init_request_info(&r, domain, CCS_MAC_FILE_EXECUTE); |
69 |
kumaneko |
3360 |
return ccs_write_audit_log(false, &r, "use_profile %u\n", r.profile); |
70 |
kumaneko |
1052 |
} |
71 |
|
|
|
72 |
kumaneko |
2002 |
/* The list for "struct ccs_domain_initializer_entry". */ |
73 |
kumaneko |
2540 |
LIST_HEAD(ccs_domain_initializer_list); |
74 |
kumaneko |
111 |
|
75 |
kumaneko |
1052 |
/** |
76 |
kumaneko |
2002 |
* ccs_update_domain_initializer_entry - Update "struct ccs_domain_initializer_entry" list. |
77 |
kumaneko |
1052 |
* |
78 |
|
|
* @domainname: The name of domain. May be NULL. |
79 |
|
|
* @program: The name of program. |
80 |
|
|
* @is_not: True if it is "no_initialize_domain" entry. |
81 |
|
|
* @is_delete: True if it is a delete request. |
82 |
|
|
* |
83 |
|
|
* Returns 0 on success, negative value otherwise. |
84 |
|
|
*/ |
85 |
kumaneko |
2002 |
static int ccs_update_domain_initializer_entry(const char *domainname, |
86 |
|
|
const char *program, |
87 |
|
|
const bool is_not, |
88 |
|
|
const bool is_delete) |
89 |
kumaneko |
111 |
{ |
90 |
kumaneko |
2002 |
struct ccs_domain_initializer_entry *ptr; |
91 |
kumaneko |
2900 |
struct ccs_domain_initializer_entry e = { .is_not = is_not }; |
92 |
kumaneko |
2540 |
int error = is_delete ? -ENOENT : -ENOMEM; |
93 |
kumaneko |
2577 |
if (!ccs_is_correct_path(program, 1, -1, -1)) |
94 |
kumaneko |
1052 |
return -EINVAL; /* No patterns allowed. */ |
95 |
kumaneko |
111 |
if (domainname) { |
96 |
kumaneko |
1052 |
if (!ccs_is_domain_def(domainname) && |
97 |
kumaneko |
2577 |
ccs_is_correct_path(domainname, 1, -1, -1)) |
98 |
kumaneko |
2900 |
e.is_last_name = true; |
99 |
kumaneko |
2577 |
else if (!ccs_is_correct_domain(domainname)) |
100 |
kumaneko |
111 |
return -EINVAL; |
101 |
kumaneko |
2900 |
e.domainname = ccs_get_name(domainname); |
102 |
|
|
if (!e.domainname) |
103 |
|
|
goto out; |
104 |
kumaneko |
111 |
} |
105 |
kumaneko |
2900 |
e.program = ccs_get_name(program); |
106 |
|
|
if (!e.program) |
107 |
|
|
goto out; |
108 |
kumaneko |
3534 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
109 |
|
|
goto out; |
110 |
kumaneko |
2690 |
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, list) { |
111 |
kumaneko |
3538 |
if (!ccs_is_same_domain_initializer_entry(ptr, &e)) |
112 |
kumaneko |
1052 |
continue; |
113 |
|
|
ptr->is_deleted = is_delete; |
114 |
|
|
error = 0; |
115 |
kumaneko |
2540 |
break; |
116 |
kumaneko |
111 |
} |
117 |
kumaneko |
3512 |
if (!is_delete && error) { |
118 |
|
|
struct ccs_domain_initializer_entry *entry = |
119 |
|
|
ccs_commit_ok(&e, sizeof(e)); |
120 |
|
|
if (entry) { |
121 |
|
|
list_add_tail_rcu(&entry->list, |
122 |
|
|
&ccs_domain_initializer_list); |
123 |
|
|
error = 0; |
124 |
|
|
} |
125 |
kumaneko |
111 |
} |
126 |
kumaneko |
2690 |
mutex_unlock(&ccs_policy_lock); |
127 |
kumaneko |
2900 |
out: |
128 |
|
|
ccs_put_name(e.domainname); |
129 |
|
|
ccs_put_name(e.program); |
130 |
kumaneko |
111 |
return error; |
131 |
|
|
} |
132 |
|
|
|
133 |
kumaneko |
1052 |
/** |
134 |
kumaneko |
2002 |
* ccs_read_domain_initializer_policy - Read "struct ccs_domain_initializer_entry" list. |
135 |
kumaneko |
1052 |
* |
136 |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
137 |
|
|
* |
138 |
|
|
* Returns true on success, false otherwise. |
139 |
kumaneko |
2690 |
* |
140 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
141 |
kumaneko |
1052 |
*/ |
142 |
|
|
bool ccs_read_domain_initializer_policy(struct ccs_io_buffer *head) |
143 |
kumaneko |
111 |
{ |
144 |
kumaneko |
2540 |
struct list_head *pos; |
145 |
|
|
bool done = true; |
146 |
kumaneko |
2690 |
list_for_each_cookie(pos, head->read_var2, |
147 |
|
|
&ccs_domain_initializer_list) { |
148 |
kumaneko |
1064 |
const char *no; |
149 |
|
|
const char *from = ""; |
150 |
|
|
const char *domain = ""; |
151 |
kumaneko |
2002 |
struct ccs_domain_initializer_entry *ptr; |
152 |
kumaneko |
2540 |
ptr = list_entry(pos, struct ccs_domain_initializer_entry, |
153 |
kumaneko |
2943 |
list); |
154 |
kumaneko |
1052 |
if (ptr->is_deleted) |
155 |
|
|
continue; |
156 |
kumaneko |
1064 |
no = ptr->is_not ? "no_" : ""; |
157 |
kumaneko |
708 |
if (ptr->domainname) { |
158 |
kumaneko |
1064 |
from = " from "; |
159 |
|
|
domain = ptr->domainname->name; |
160 |
|
|
} |
161 |
kumaneko |
2943 |
done = ccs_io_printf(head, "%s" CCS_KEYWORD_INITIALIZE_DOMAIN |
162 |
|
|
"%s%s%s\n", no, ptr->program->name, from, |
163 |
|
|
domain); |
164 |
kumaneko |
2540 |
if (!done) |
165 |
|
|
break; |
166 |
kumaneko |
111 |
} |
167 |
kumaneko |
2540 |
return done; |
168 |
kumaneko |
111 |
} |
169 |
|
|
|
170 |
kumaneko |
1052 |
/** |
171 |
kumaneko |
2002 |
* ccs_write_domain_initializer_policy - Write "struct ccs_domain_initializer_entry" list. |
172 |
kumaneko |
1052 |
* |
173 |
|
|
* @data: String to parse. |
174 |
|
|
* @is_not: True if it is "no_initialize_domain" entry. |
175 |
|
|
* @is_delete: True if it is a delete request. |
176 |
|
|
* |
177 |
|
|
* Returns 0 on success, negative value otherwise. |
178 |
|
|
*/ |
179 |
|
|
int ccs_write_domain_initializer_policy(char *data, const bool is_not, |
180 |
|
|
const bool is_delete) |
181 |
kumaneko |
111 |
{ |
182 |
|
|
char *cp = strstr(data, " from "); |
183 |
|
|
if (cp) { |
184 |
|
|
*cp = '\0'; |
185 |
kumaneko |
2002 |
return ccs_update_domain_initializer_entry(cp + 6, data, |
186 |
|
|
is_not, is_delete); |
187 |
kumaneko |
111 |
} |
188 |
kumaneko |
2002 |
return ccs_update_domain_initializer_entry(NULL, data, is_not, |
189 |
|
|
is_delete); |
190 |
kumaneko |
111 |
} |
191 |
|
|
|
192 |
kumaneko |
1052 |
/** |
193 |
kumaneko |
2002 |
* ccs_is_domain_initializer - Check whether the given program causes domainname reinitialization. |
194 |
kumaneko |
1052 |
* |
195 |
|
|
* @domainname: The name of domain. |
196 |
|
|
* @program: The name of program. |
197 |
|
|
* @last_name: The last component of @domainname. |
198 |
|
|
* |
199 |
|
|
* Returns true if executing @program reinitializes domain transition, |
200 |
|
|
* false otherwise. |
201 |
kumaneko |
2690 |
* |
202 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
203 |
kumaneko |
1052 |
*/ |
204 |
kumaneko |
2002 |
static bool ccs_is_domain_initializer(const struct ccs_path_info *domainname, |
205 |
|
|
const struct ccs_path_info *program, |
206 |
|
|
const struct ccs_path_info *last_name) |
207 |
kumaneko |
111 |
{ |
208 |
kumaneko |
2002 |
struct ccs_domain_initializer_entry *ptr; |
209 |
kumaneko |
1016 |
bool flag = false; |
210 |
kumaneko |
2690 |
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, list) { |
211 |
kumaneko |
1052 |
if (ptr->is_deleted) |
212 |
|
|
continue; |
213 |
kumaneko |
111 |
if (ptr->domainname) { |
214 |
|
|
if (!ptr->is_last_name) { |
215 |
kumaneko |
1052 |
if (ptr->domainname != domainname) |
216 |
|
|
continue; |
217 |
kumaneko |
111 |
} else { |
218 |
kumaneko |
1052 |
if (ccs_pathcmp(ptr->domainname, last_name)) |
219 |
|
|
continue; |
220 |
kumaneko |
111 |
} |
221 |
|
|
} |
222 |
kumaneko |
1052 |
if (ccs_pathcmp(ptr->program, program)) |
223 |
|
|
continue; |
224 |
kumaneko |
2540 |
if (ptr->is_not) { |
225 |
|
|
flag = false; |
226 |
|
|
break; |
227 |
|
|
} |
228 |
kumaneko |
1016 |
flag = true; |
229 |
kumaneko |
111 |
} |
230 |
|
|
return flag; |
231 |
|
|
} |
232 |
|
|
|
233 |
kumaneko |
2002 |
/* The list for "struct ccs_domain_keeper_entry". */ |
234 |
kumaneko |
2540 |
LIST_HEAD(ccs_domain_keeper_list); |
235 |
kumaneko |
111 |
|
236 |
kumaneko |
1052 |
/** |
237 |
kumaneko |
2002 |
* ccs_update_domain_keeper_entry - Update "struct ccs_domain_keeper_entry" list. |
238 |
kumaneko |
1052 |
* |
239 |
|
|
* @domainname: The name of domain. |
240 |
|
|
* @program: The name of program. May be NULL. |
241 |
|
|
* @is_not: True if it is "no_keep_domain" entry. |
242 |
|
|
* @is_delete: True if it is a delete request. |
243 |
|
|
* |
244 |
|
|
* Returns 0 on success, negative value otherwise. |
245 |
|
|
*/ |
246 |
kumaneko |
2002 |
static int ccs_update_domain_keeper_entry(const char *domainname, |
247 |
|
|
const char *program, |
248 |
|
|
const bool is_not, |
249 |
|
|
const bool is_delete) |
250 |
kumaneko |
111 |
{ |
251 |
kumaneko |
2002 |
struct ccs_domain_keeper_entry *ptr; |
252 |
kumaneko |
2900 |
struct ccs_domain_keeper_entry e = { .is_not = is_not }; |
253 |
kumaneko |
2540 |
int error = is_delete ? -ENOENT : -ENOMEM; |
254 |
kumaneko |
1052 |
if (!ccs_is_domain_def(domainname) && |
255 |
kumaneko |
2577 |
ccs_is_correct_path(domainname, 1, -1, -1)) |
256 |
kumaneko |
2900 |
e.is_last_name = true; |
257 |
kumaneko |
2577 |
else if (!ccs_is_correct_domain(domainname)) |
258 |
kumaneko |
111 |
return -EINVAL; |
259 |
|
|
if (program) { |
260 |
kumaneko |
2577 |
if (!ccs_is_correct_path(program, 1, -1, -1)) |
261 |
kumaneko |
1052 |
return -EINVAL; |
262 |
kumaneko |
2900 |
e.program = ccs_get_name(program); |
263 |
|
|
if (!e.program) |
264 |
|
|
goto out; |
265 |
kumaneko |
111 |
} |
266 |
kumaneko |
2900 |
e.domainname = ccs_get_name(domainname); |
267 |
|
|
if (!e.domainname) |
268 |
|
|
goto out; |
269 |
kumaneko |
3534 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
270 |
|
|
goto out; |
271 |
kumaneko |
2690 |
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
272 |
kumaneko |
3538 |
if (!ccs_is_same_domain_keeper_entry(ptr, &e)) |
273 |
kumaneko |
1052 |
continue; |
274 |
|
|
ptr->is_deleted = is_delete; |
275 |
|
|
error = 0; |
276 |
kumaneko |
2540 |
break; |
277 |
kumaneko |
111 |
} |
278 |
kumaneko |
3512 |
if (!is_delete && error) { |
279 |
|
|
struct ccs_domain_keeper_entry *entry = |
280 |
|
|
ccs_commit_ok(&e, sizeof(e)); |
281 |
|
|
if (entry) { |
282 |
|
|
list_add_tail_rcu(&entry->list, |
283 |
|
|
&ccs_domain_keeper_list); |
284 |
|
|
error = 0; |
285 |
|
|
} |
286 |
kumaneko |
111 |
} |
287 |
kumaneko |
2690 |
mutex_unlock(&ccs_policy_lock); |
288 |
kumaneko |
2900 |
out: |
289 |
|
|
ccs_put_name(e.domainname); |
290 |
|
|
ccs_put_name(e.program); |
291 |
kumaneko |
111 |
return error; |
292 |
|
|
} |
293 |
|
|
|
294 |
kumaneko |
1052 |
/** |
295 |
kumaneko |
2002 |
* ccs_write_domain_keeper_policy - Write "struct ccs_domain_keeper_entry" list. |
296 |
kumaneko |
1052 |
* |
297 |
|
|
* @data: String to parse. |
298 |
|
|
* @is_not: True if it is "no_keep_domain" entry. |
299 |
|
|
* @is_delete: True if it is a delete request. |
300 |
|
|
* |
301 |
|
|
*/ |
302 |
|
|
int ccs_write_domain_keeper_policy(char *data, const bool is_not, |
303 |
|
|
const bool is_delete) |
304 |
kumaneko |
111 |
{ |
305 |
|
|
char *cp = strstr(data, " from "); |
306 |
|
|
if (cp) { |
307 |
|
|
*cp = '\0'; |
308 |
kumaneko |
2002 |
return ccs_update_domain_keeper_entry(cp + 6, data, |
309 |
|
|
is_not, is_delete); |
310 |
kumaneko |
111 |
} |
311 |
kumaneko |
2002 |
return ccs_update_domain_keeper_entry(data, NULL, is_not, is_delete); |
312 |
kumaneko |
111 |
} |
313 |
|
|
|
314 |
kumaneko |
1052 |
/** |
315 |
kumaneko |
2002 |
* ccs_read_domain_keeper_policy - Read "struct ccs_domain_keeper_entry" list. |
316 |
kumaneko |
1052 |
* |
317 |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
318 |
|
|
* |
319 |
|
|
* Returns true on success, false otherwise. |
320 |
kumaneko |
2690 |
* |
321 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
322 |
kumaneko |
1052 |
*/ |
323 |
|
|
bool ccs_read_domain_keeper_policy(struct ccs_io_buffer *head) |
324 |
kumaneko |
111 |
{ |
325 |
kumaneko |
2540 |
struct list_head *pos; |
326 |
|
|
bool done = true; |
327 |
kumaneko |
2690 |
list_for_each_cookie(pos, head->read_var2, |
328 |
|
|
&ccs_domain_keeper_list) { |
329 |
kumaneko |
2002 |
struct ccs_domain_keeper_entry *ptr; |
330 |
kumaneko |
1064 |
const char *no; |
331 |
|
|
const char *from = ""; |
332 |
|
|
const char *program = ""; |
333 |
kumaneko |
2540 |
ptr = list_entry(pos, struct ccs_domain_keeper_entry, list); |
334 |
kumaneko |
1052 |
if (ptr->is_deleted) |
335 |
|
|
continue; |
336 |
kumaneko |
1064 |
no = ptr->is_not ? "no_" : ""; |
337 |
kumaneko |
708 |
if (ptr->program) { |
338 |
kumaneko |
1064 |
from = " from "; |
339 |
|
|
program = ptr->program->name; |
340 |
|
|
} |
341 |
kumaneko |
2892 |
done = ccs_io_printf(head, "%s" CCS_KEYWORD_KEEP_DOMAIN |
342 |
|
|
"%s%s%s\n", no, program, from, |
343 |
|
|
ptr->domainname->name); |
344 |
kumaneko |
2540 |
if (!done) |
345 |
|
|
break; |
346 |
kumaneko |
111 |
} |
347 |
kumaneko |
2540 |
return done; |
348 |
kumaneko |
111 |
} |
349 |
|
|
|
350 |
kumaneko |
1052 |
/** |
351 |
kumaneko |
2002 |
* ccs_is_domain_keeper - Check whether the given program causes domain transition suppression. |
352 |
kumaneko |
1052 |
* |
353 |
|
|
* @domainname: The name of domain. |
354 |
|
|
* @program: The name of program. |
355 |
|
|
* @last_name: The last component of @domainname. |
356 |
|
|
* |
357 |
|
|
* Returns true if executing @program supresses domain transition, |
358 |
|
|
* false otherwise. |
359 |
kumaneko |
2690 |
* |
360 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
361 |
kumaneko |
1052 |
*/ |
362 |
kumaneko |
2002 |
static bool ccs_is_domain_keeper(const struct ccs_path_info *domainname, |
363 |
|
|
const struct ccs_path_info *program, |
364 |
|
|
const struct ccs_path_info *last_name) |
365 |
kumaneko |
111 |
{ |
366 |
kumaneko |
2002 |
struct ccs_domain_keeper_entry *ptr; |
367 |
kumaneko |
1016 |
bool flag = false; |
368 |
kumaneko |
2690 |
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
369 |
kumaneko |
1052 |
if (ptr->is_deleted) |
370 |
|
|
continue; |
371 |
kumaneko |
111 |
if (!ptr->is_last_name) { |
372 |
kumaneko |
1052 |
if (ptr->domainname != domainname) |
373 |
|
|
continue; |
374 |
kumaneko |
111 |
} else { |
375 |
kumaneko |
1052 |
if (ccs_pathcmp(ptr->domainname, last_name)) |
376 |
|
|
continue; |
377 |
kumaneko |
111 |
} |
378 |
kumaneko |
1052 |
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
379 |
|
|
continue; |
380 |
kumaneko |
2540 |
if (ptr->is_not) { |
381 |
|
|
flag = false; |
382 |
|
|
break; |
383 |
|
|
} |
384 |
kumaneko |
1016 |
flag = true; |
385 |
kumaneko |
111 |
} |
386 |
|
|
return flag; |
387 |
|
|
} |
388 |
|
|
|
389 |
kumaneko |
2002 |
/* The list for "struct ccs_aggregator_entry". */ |
390 |
kumaneko |
2540 |
LIST_HEAD(ccs_aggregator_list); |
391 |
kumaneko |
111 |
|
392 |
kumaneko |
1052 |
/** |
393 |
kumaneko |
2002 |
* ccs_update_aggregator_entry - Update "struct ccs_aggregator_entry" list. |
394 |
kumaneko |
1052 |
* |
395 |
|
|
* @original_name: The original program's name. |
396 |
|
|
* @aggregated_name: The aggregated program's name. |
397 |
|
|
* @is_delete: True if it is a delete request. |
398 |
|
|
* |
399 |
|
|
* Returns 0 on success, negative value otherwise. |
400 |
|
|
*/ |
401 |
kumaneko |
2002 |
static int ccs_update_aggregator_entry(const char *original_name, |
402 |
|
|
const char *aggregated_name, |
403 |
|
|
const bool is_delete) |
404 |
kumaneko |
111 |
{ |
405 |
kumaneko |
2002 |
struct ccs_aggregator_entry *ptr; |
406 |
kumaneko |
2900 |
struct ccs_aggregator_entry e = { }; |
407 |
kumaneko |
2540 |
int error = is_delete ? -ENOENT : -ENOMEM; |
408 |
kumaneko |
2577 |
if (!ccs_is_correct_path(original_name, 1, 0, -1) || |
409 |
|
|
!ccs_is_correct_path(aggregated_name, 1, -1, -1)) |
410 |
kumaneko |
1052 |
return -EINVAL; |
411 |
kumaneko |
2900 |
e.original_name = ccs_get_name(original_name); |
412 |
|
|
e.aggregated_name = ccs_get_name(aggregated_name); |
413 |
|
|
if (!e.original_name || !e.aggregated_name) |
414 |
|
|
goto out; |
415 |
kumaneko |
3534 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
416 |
|
|
goto out; |
417 |
kumaneko |
2690 |
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
418 |
kumaneko |
3538 |
if (!ccs_is_same_aggregator_entry(ptr, &e)) |
419 |
kumaneko |
1052 |
continue; |
420 |
|
|
ptr->is_deleted = is_delete; |
421 |
|
|
error = 0; |
422 |
kumaneko |
2540 |
break; |
423 |
kumaneko |
111 |
} |
424 |
kumaneko |
3512 |
if (!is_delete && error) { |
425 |
|
|
struct ccs_aggregator_entry *entry = |
426 |
|
|
ccs_commit_ok(&e, sizeof(e)); |
427 |
|
|
if (entry) { |
428 |
|
|
list_add_tail_rcu(&entry->list, &ccs_aggregator_list); |
429 |
|
|
error = 0; |
430 |
|
|
} |
431 |
kumaneko |
111 |
} |
432 |
kumaneko |
2690 |
mutex_unlock(&ccs_policy_lock); |
433 |
kumaneko |
2900 |
out: |
434 |
|
|
ccs_put_name(e.original_name); |
435 |
|
|
ccs_put_name(e.aggregated_name); |
436 |
kumaneko |
111 |
return error; |
437 |
|
|
} |
438 |
|
|
|
439 |
kumaneko |
1052 |
/** |
440 |
kumaneko |
2002 |
* ccs_read_aggregator_policy - Read "struct ccs_aggregator_entry" list. |
441 |
kumaneko |
1052 |
* |
442 |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
443 |
|
|
* |
444 |
|
|
* Returns true on success, false otherwise. |
445 |
kumaneko |
2690 |
* |
446 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
447 |
kumaneko |
1052 |
*/ |
448 |
|
|
bool ccs_read_aggregator_policy(struct ccs_io_buffer *head) |
449 |
kumaneko |
111 |
{ |
450 |
kumaneko |
2540 |
struct list_head *pos; |
451 |
|
|
bool done = true; |
452 |
kumaneko |
2690 |
list_for_each_cookie(pos, head->read_var2, &ccs_aggregator_list) { |
453 |
kumaneko |
2002 |
struct ccs_aggregator_entry *ptr; |
454 |
kumaneko |
2540 |
ptr = list_entry(pos, struct ccs_aggregator_entry, list); |
455 |
kumaneko |
1052 |
if (ptr->is_deleted) |
456 |
|
|
continue; |
457 |
kumaneko |
2892 |
done = ccs_io_printf(head, CCS_KEYWORD_AGGREGATOR "%s %s\n", |
458 |
kumaneko |
2540 |
ptr->original_name->name, |
459 |
|
|
ptr->aggregated_name->name); |
460 |
|
|
if (!done) |
461 |
|
|
break; |
462 |
kumaneko |
111 |
} |
463 |
kumaneko |
2540 |
return done; |
464 |
kumaneko |
111 |
} |
465 |
|
|
|
466 |
kumaneko |
1052 |
/** |
467 |
kumaneko |
2002 |
* ccs_write_aggregator_policy - Write "struct ccs_aggregator_entry" list. |
468 |
kumaneko |
1052 |
* |
469 |
|
|
* @data: String to parse. |
470 |
|
|
* @is_delete: True if it is a delete request. |
471 |
|
|
* |
472 |
|
|
* Returns 0 on success, negative value otherwise. |
473 |
|
|
*/ |
474 |
|
|
int ccs_write_aggregator_policy(char *data, const bool is_delete) |
475 |
kumaneko |
111 |
{ |
476 |
kumaneko |
2779 |
char *w[2]; |
477 |
|
|
if (!ccs_tokenize(data, w, sizeof(w)) || !w[1][0]) |
478 |
kumaneko |
2870 |
return -EINVAL; |
479 |
kumaneko |
2779 |
return ccs_update_aggregator_entry(w[0], w[1], is_delete); |
480 |
kumaneko |
111 |
} |
481 |
|
|
|
482 |
kumaneko |
2393 |
/* Domain create/delete handler. */ |
483 |
kumaneko |
111 |
|
484 |
kumaneko |
1052 |
/** |
485 |
|
|
* ccs_delete_domain - Delete a domain. |
486 |
|
|
* |
487 |
|
|
* @domainname: The name of domain. |
488 |
|
|
* |
489 |
|
|
* Returns 0. |
490 |
|
|
*/ |
491 |
|
|
int ccs_delete_domain(char *domainname) |
492 |
kumaneko |
111 |
{ |
493 |
kumaneko |
2282 |
struct ccs_domain_info *domain; |
494 |
kumaneko |
2002 |
struct ccs_path_info name; |
495 |
kumaneko |
1052 |
name.name = domainname; |
496 |
|
|
ccs_fill_path_info(&name); |
497 |
kumaneko |
3534 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
498 |
|
|
return 0; |
499 |
kumaneko |
111 |
/* Is there an active domain? */ |
500 |
kumaneko |
2690 |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
501 |
kumaneko |
2282 |
/* Never delete ccs_kernel_domain */ |
502 |
|
|
if (domain == &ccs_kernel_domain) |
503 |
kumaneko |
1052 |
continue; |
504 |
|
|
if (domain->is_deleted || |
505 |
|
|
ccs_pathcmp(domain->domainname, &name)) |
506 |
|
|
continue; |
507 |
kumaneko |
2393 |
domain->is_deleted = true; |
508 |
kumaneko |
708 |
break; |
509 |
kumaneko |
111 |
} |
510 |
kumaneko |
2690 |
mutex_unlock(&ccs_policy_lock); |
511 |
kumaneko |
111 |
return 0; |
512 |
|
|
} |
513 |
|
|
|
514 |
kumaneko |
1052 |
/** |
515 |
|
|
* ccs_find_or_assign_new_domain - Create a domain. |
516 |
|
|
* |
517 |
|
|
* @domainname: The name of domain. |
518 |
|
|
* @profile: Profile number to assign if the domain was newly created. |
519 |
|
|
* |
520 |
kumaneko |
2690 |
* Returns pointer to "struct ccs_domain_info" on success, NULL otherwise. |
521 |
kumaneko |
1052 |
*/ |
522 |
kumaneko |
2690 |
struct ccs_domain_info *ccs_find_or_assign_new_domain(const char *domainname, |
523 |
|
|
const u8 profile) |
524 |
kumaneko |
111 |
{ |
525 |
kumaneko |
2544 |
struct ccs_domain_info *entry; |
526 |
kumaneko |
3534 |
struct ccs_domain_info *domain = NULL; |
527 |
kumaneko |
2544 |
const struct ccs_path_info *saved_domainname; |
528 |
kumaneko |
2690 |
bool found = false; |
529 |
kumaneko |
2870 |
|
530 |
kumaneko |
2577 |
if (!ccs_is_correct_domain(domainname)) |
531 |
kumaneko |
2690 |
return NULL; |
532 |
kumaneko |
2544 |
saved_domainname = ccs_get_name(domainname); |
533 |
|
|
if (!saved_domainname) |
534 |
kumaneko |
2690 |
return NULL; |
535 |
kumaneko |
3512 |
entry = kzalloc(sizeof(*entry), CCS_GFP_FLAGS); |
536 |
kumaneko |
3534 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
537 |
|
|
goto out; |
538 |
kumaneko |
2690 |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
539 |
kumaneko |
2544 |
if (domain->is_deleted || |
540 |
|
|
ccs_pathcmp(saved_domainname, domain->domainname)) |
541 |
|
|
continue; |
542 |
kumaneko |
2690 |
found = true; |
543 |
kumaneko |
2544 |
break; |
544 |
kumaneko |
111 |
} |
545 |
kumaneko |
2718 |
if (!found && ccs_memory_ok(entry, sizeof(*entry))) { |
546 |
kumaneko |
2544 |
INIT_LIST_HEAD(&entry->acl_info_list); |
547 |
|
|
entry->domainname = saved_domainname; |
548 |
|
|
saved_domainname = NULL; |
549 |
|
|
entry->profile = profile; |
550 |
kumaneko |
2690 |
list_add_tail_rcu(&entry->list, &ccs_domain_list); |
551 |
|
|
domain = entry; |
552 |
kumaneko |
2544 |
entry = NULL; |
553 |
kumaneko |
2690 |
found = true; |
554 |
kumaneko |
2544 |
} |
555 |
kumaneko |
2690 |
mutex_unlock(&ccs_policy_lock); |
556 |
kumaneko |
3534 |
out: |
557 |
kumaneko |
2540 |
ccs_put_name(saved_domainname); |
558 |
kumaneko |
2545 |
kfree(entry); |
559 |
kumaneko |
2690 |
return found ? domain : NULL; |
560 |
kumaneko |
111 |
} |
561 |
|
|
|
562 |
kumaneko |
1052 |
/** |
563 |
kumaneko |
2002 |
* ccs_find_next_domain - Find a domain. |
564 |
kumaneko |
1052 |
* |
565 |
kumaneko |
2075 |
* @ee: Pointer to "struct ccs_execve_entry". |
566 |
kumaneko |
1052 |
* |
567 |
|
|
* Returns 0 on success, negative value otherwise. |
568 |
kumaneko |
2690 |
* |
569 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
570 |
kumaneko |
1052 |
*/ |
571 |
kumaneko |
2037 |
static int ccs_find_next_domain(struct ccs_execve_entry *ee) |
572 |
kumaneko |
115 |
{ |
573 |
kumaneko |
2037 |
struct ccs_request_info *r = &ee->r; |
574 |
|
|
const struct ccs_path_info *handler = ee->handler; |
575 |
kumaneko |
2691 |
struct ccs_domain_info *domain = NULL; |
576 |
kumaneko |
2690 |
const char *old_domain_name = r->domain->domainname->name; |
577 |
kumaneko |
2037 |
struct linux_binprm *bprm = ee->bprm; |
578 |
kumaneko |
2282 |
const u32 ccs_flags = current->ccs_flags; |
579 |
kumaneko |
2932 |
struct ccs_path_info rn = { }; /* real name */ |
580 |
kumaneko |
2002 |
struct ccs_path_info ln; /* last name */ |
581 |
kumaneko |
111 |
int retval; |
582 |
kumaneko |
2932 |
bool need_kfree = false; |
583 |
kumaneko |
2943 |
ln.name = ccs_last_word(old_domain_name); |
584 |
|
|
ccs_fill_path_info(&ln); |
585 |
kumaneko |
1561 |
retry: |
586 |
kumaneko |
2282 |
current->ccs_flags = ccs_flags; |
587 |
kumaneko |
2690 |
r->cond = NULL; |
588 |
kumaneko |
2943 |
if (need_kfree) { |
589 |
|
|
kfree(rn.name); |
590 |
|
|
need_kfree = false; |
591 |
|
|
} |
592 |
|
|
|
593 |
kumaneko |
2738 |
/* Get symlink's pathname of program. */ |
594 |
kumaneko |
2932 |
retval = ccs_symlink_path(bprm->filename, &rn); |
595 |
kumaneko |
2075 |
if (retval < 0) |
596 |
kumaneko |
1052 |
goto out; |
597 |
kumaneko |
2932 |
need_kfree = true; |
598 |
kumaneko |
111 |
|
599 |
kumaneko |
1657 |
if (handler) { |
600 |
|
|
if (ccs_pathcmp(&rn, handler)) { |
601 |
kumaneko |
1064 |
/* Failed to verify execute handler. */ |
602 |
kumaneko |
1029 |
static u8 counter = 20; |
603 |
|
|
if (counter) { |
604 |
|
|
counter--; |
605 |
kumaneko |
1052 |
printk(KERN_WARNING "Failed to verify: %s\n", |
606 |
kumaneko |
1657 |
handler->name); |
607 |
kumaneko |
1029 |
} |
608 |
|
|
goto out; |
609 |
|
|
} |
610 |
kumaneko |
2943 |
} else { |
611 |
kumaneko |
2002 |
struct ccs_aggregator_entry *ptr; |
612 |
kumaneko |
2943 |
/* Check 'aggregator' directive. */ |
613 |
kumaneko |
2690 |
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
614 |
kumaneko |
1052 |
if (ptr->is_deleted || |
615 |
kumaneko |
1657 |
!ccs_path_matches_pattern(&rn, ptr->original_name)) |
616 |
kumaneko |
1052 |
continue; |
617 |
kumaneko |
2932 |
kfree(rn.name); |
618 |
|
|
need_kfree = false; |
619 |
kumaneko |
2943 |
/* This is OK because it is read only. */ |
620 |
kumaneko |
2932 |
rn = *ptr->aggregated_name; |
621 |
kumaneko |
183 |
break; |
622 |
|
|
} |
623 |
kumaneko |
2943 |
|
624 |
|
|
/* Check execute permission. */ |
625 |
|
|
retval = ccs_exec_perm(r, &rn); |
626 |
kumaneko |
3494 |
if (retval == CCS_RETRY_REQUEST) |
627 |
kumaneko |
2943 |
goto retry; |
628 |
|
|
if (retval < 0) |
629 |
|
|
goto out; |
630 |
kumaneko |
183 |
} |
631 |
|
|
|
632 |
kumaneko |
2943 |
/* Calculate domain to transit to. */ |
633 |
kumaneko |
2690 |
if (ccs_is_domain_initializer(r->domain->domainname, &rn, &ln)) { |
634 |
kumaneko |
2282 |
/* Transit to the child of ccs_kernel_domain domain. */ |
635 |
kumaneko |
2932 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, ROOT_NAME " " "%s", |
636 |
|
|
rn.name); |
637 |
kumaneko |
2690 |
} else if (r->domain == &ccs_kernel_domain && !ccs_policy_loaded) { |
638 |
kumaneko |
111 |
/* |
639 |
kumaneko |
1052 |
* Needn't to transit from kernel domain before starting |
640 |
kumaneko |
1064 |
* /sbin/init. But transit from kernel domain if executing |
641 |
|
|
* initializers because they might start before /sbin/init. |
642 |
kumaneko |
111 |
*/ |
643 |
kumaneko |
2690 |
domain = r->domain; |
644 |
|
|
} else if (ccs_is_domain_keeper(r->domain->domainname, &rn, &ln)) { |
645 |
kumaneko |
111 |
/* Keep current domain. */ |
646 |
kumaneko |
2690 |
domain = r->domain; |
647 |
kumaneko |
111 |
} else { |
648 |
|
|
/* Normal domain transition. */ |
649 |
kumaneko |
2932 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s %s", |
650 |
|
|
old_domain_name, rn.name); |
651 |
kumaneko |
111 |
} |
652 |
kumaneko |
2932 |
if (domain || strlen(ee->tmp) >= CCS_EXEC_TMPSIZE - 10) |
653 |
kumaneko |
1052 |
goto done; |
654 |
kumaneko |
2932 |
domain = ccs_find_domain(ee->tmp); |
655 |
kumaneko |
2690 |
if (domain) |
656 |
kumaneko |
1052 |
goto done; |
657 |
kumaneko |
2958 |
if (r->mode == CCS_CONFIG_ENFORCING) { |
658 |
kumaneko |
2932 |
int error = ccs_supervisor(r, "# wants to create domain\n" |
659 |
|
|
"%s\n", ee->tmp); |
660 |
kumaneko |
3494 |
if (error == CCS_RETRY_REQUEST) |
661 |
kumaneko |
1561 |
goto retry; |
662 |
|
|
if (error < 0) |
663 |
kumaneko |
1052 |
goto done; |
664 |
kumaneko |
1561 |
} |
665 |
kumaneko |
2932 |
domain = ccs_find_or_assign_new_domain(ee->tmp, r->profile); |
666 |
kumaneko |
2690 |
if (domain) |
667 |
kumaneko |
3215 |
ccs_audit_domain_creation_log(domain); |
668 |
kumaneko |
1052 |
done: |
669 |
kumaneko |
2691 |
if (!domain) { |
670 |
kumaneko |
3258 |
retval = (r->mode == CCS_CONFIG_ENFORCING) ? -EPERM : 0; |
671 |
|
|
if (!r->domain->domain_transition_failed) { |
672 |
kumaneko |
2691 |
r->domain->domain_transition_failed = true; |
673 |
kumaneko |
3258 |
ccs_write_audit_log(false, r, |
674 |
|
|
CCS_KEYWORD_TRANSITION_FAILED |
675 |
|
|
"\n"); |
676 |
|
|
printk(KERN_WARNING "ERROR: Domain '%s' not defined.\n", |
677 |
|
|
ee->tmp); |
678 |
kumaneko |
2691 |
} |
679 |
|
|
} else { |
680 |
kumaneko |
111 |
retval = 0; |
681 |
|
|
} |
682 |
kumaneko |
1052 |
out: |
683 |
kumaneko |
2691 |
if (domain) |
684 |
kumaneko |
2870 |
r->domain = domain; |
685 |
kumaneko |
2932 |
if (need_kfree) |
686 |
|
|
kfree(rn.name); |
687 |
kumaneko |
111 |
return retval; |
688 |
|
|
} |
689 |
|
|
|
690 |
kumaneko |
1052 |
/** |
691 |
kumaneko |
2922 |
* ccs_environ - Check permission for environment variable names. |
692 |
kumaneko |
1052 |
* |
693 |
kumaneko |
2037 |
* @ee: Pointer to "struct ccs_execve_entry". |
694 |
kumaneko |
1052 |
* |
695 |
|
|
* Returns 0 on success, negative value otherwise. |
696 |
|
|
*/ |
697 |
kumaneko |
2922 |
static int ccs_environ(struct ccs_execve_entry *ee) |
698 |
kumaneko |
581 |
{ |
699 |
kumaneko |
2037 |
struct ccs_request_info *r = &ee->r; |
700 |
|
|
struct linux_binprm *bprm = ee->bprm; |
701 |
kumaneko |
3128 |
/* env_page->data is allocated by ccs_dump_page(). */ |
702 |
|
|
struct ccs_page_dump env_page = { }; |
703 |
|
|
char *arg_ptr; /* Size is CCS_EXEC_TMPSIZE bytes */ |
704 |
kumaneko |
581 |
int arg_len = 0; |
705 |
|
|
unsigned long pos = bprm->p; |
706 |
kumaneko |
1064 |
int offset = pos % PAGE_SIZE; |
707 |
kumaneko |
581 |
int argv_count = bprm->argc; |
708 |
|
|
int envp_count = bprm->envc; |
709 |
kumaneko |
1052 |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
710 |
kumaneko |
581 |
int error = -ENOMEM; |
711 |
kumaneko |
1657 |
if (!r->mode || !envp_count) |
712 |
kumaneko |
1052 |
return 0; |
713 |
kumaneko |
3512 |
arg_ptr = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); |
714 |
kumaneko |
3128 |
if (!arg_ptr) |
715 |
|
|
goto out; |
716 |
kumaneko |
581 |
while (error == -ENOMEM) { |
717 |
kumaneko |
3128 |
if (!ccs_dump_page(bprm, pos, &env_page)) |
718 |
kumaneko |
1052 |
goto out; |
719 |
kumaneko |
986 |
pos += PAGE_SIZE - offset; |
720 |
kumaneko |
581 |
/* Read. */ |
721 |
|
|
while (argv_count && offset < PAGE_SIZE) { |
722 |
kumaneko |
3128 |
if (!env_page.data[offset++]) |
723 |
kumaneko |
1052 |
argv_count--; |
724 |
kumaneko |
581 |
} |
725 |
kumaneko |
2037 |
if (argv_count) { |
726 |
|
|
offset = 0; |
727 |
|
|
continue; |
728 |
|
|
} |
729 |
kumaneko |
581 |
while (offset < PAGE_SIZE) { |
730 |
kumaneko |
3128 |
const unsigned char c = env_page.data[offset++]; |
731 |
kumaneko |
2932 |
if (c && arg_len < CCS_EXEC_TMPSIZE - 10) { |
732 |
kumaneko |
581 |
if (c == '=') { |
733 |
|
|
arg_ptr[arg_len++] = '\0'; |
734 |
|
|
} else if (c == '\\') { |
735 |
|
|
arg_ptr[arg_len++] = '\\'; |
736 |
|
|
arg_ptr[arg_len++] = '\\'; |
737 |
|
|
} else if (c > ' ' && c < 127) { |
738 |
|
|
arg_ptr[arg_len++] = c; |
739 |
|
|
} else { |
740 |
|
|
arg_ptr[arg_len++] = '\\'; |
741 |
|
|
arg_ptr[arg_len++] = (c >> 6) + '0'; |
742 |
kumaneko |
1052 |
arg_ptr[arg_len++] |
743 |
|
|
= ((c >> 3) & 7) + '0'; |
744 |
kumaneko |
581 |
arg_ptr[arg_len++] = (c & 7) + '0'; |
745 |
|
|
} |
746 |
|
|
} else { |
747 |
|
|
arg_ptr[arg_len] = '\0'; |
748 |
|
|
} |
749 |
kumaneko |
1052 |
if (c) |
750 |
|
|
continue; |
751 |
kumaneko |
2922 |
if (ccs_env_perm(r, arg_ptr)) { |
752 |
kumaneko |
581 |
error = -EPERM; |
753 |
|
|
break; |
754 |
|
|
} |
755 |
|
|
if (!--envp_count) { |
756 |
|
|
error = 0; |
757 |
|
|
break; |
758 |
|
|
} |
759 |
|
|
arg_len = 0; |
760 |
|
|
} |
761 |
|
|
offset = 0; |
762 |
|
|
} |
763 |
|
|
out: |
764 |
kumaneko |
1657 |
if (r->mode != 3) |
765 |
kumaneko |
1052 |
error = 0; |
766 |
kumaneko |
3128 |
kfree(env_page.data); |
767 |
kumaneko |
3272 |
kfree(arg_ptr); |
768 |
kumaneko |
581 |
return error; |
769 |
|
|
} |
770 |
kumaneko |
111 |
|
771 |
kumaneko |
1052 |
/** |
772 |
kumaneko |
2002 |
* ccs_unescape - Unescape escaped string. |
773 |
kumaneko |
1052 |
* |
774 |
kumaneko |
2075 |
* @dest: String to unescape. |
775 |
kumaneko |
1052 |
* |
776 |
|
|
* Returns nothing. |
777 |
|
|
*/ |
778 |
kumaneko |
2002 |
static void ccs_unescape(unsigned char *dest) |
779 |
kumaneko |
708 |
{ |
780 |
|
|
unsigned char *src = dest; |
781 |
kumaneko |
1064 |
unsigned char c; |
782 |
|
|
unsigned char d; |
783 |
|
|
unsigned char e; |
784 |
kumaneko |
1747 |
while (1) { |
785 |
|
|
c = *src++; |
786 |
|
|
if (!c) |
787 |
|
|
break; |
788 |
kumaneko |
708 |
if (c != '\\') { |
789 |
|
|
*dest++ = c; |
790 |
|
|
continue; |
791 |
|
|
} |
792 |
|
|
c = *src++; |
793 |
|
|
if (c == '\\') { |
794 |
|
|
*dest++ = c; |
795 |
kumaneko |
1052 |
continue; |
796 |
|
|
} |
797 |
|
|
if (c < '0' || c > '3') |
798 |
kumaneko |
708 |
break; |
799 |
kumaneko |
1052 |
d = *src++; |
800 |
|
|
if (d < '0' || d > '7') |
801 |
|
|
break; |
802 |
|
|
e = *src++; |
803 |
|
|
if (e < '0' || e > '7') |
804 |
|
|
break; |
805 |
|
|
*dest++ = ((c - '0') << 6) + ((d - '0') << 3) + (e - '0'); |
806 |
kumaneko |
708 |
} |
807 |
|
|
*dest = '\0'; |
808 |
|
|
} |
809 |
|
|
|
810 |
kumaneko |
1052 |
/** |
811 |
kumaneko |
2002 |
* ccs_root_depth - Get number of directories to strip. |
812 |
kumaneko |
1052 |
* |
813 |
|
|
* @dentry: Pointer to "struct dentry". |
814 |
|
|
* @vfsmnt: Pointer to "struct vfsmount". |
815 |
|
|
* |
816 |
|
|
* Returns number of directories to strip. |
817 |
kumaneko |
1029 |
*/ |
818 |
kumaneko |
2002 |
static inline int ccs_root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
819 |
kumaneko |
708 |
{ |
820 |
kumaneko |
1029 |
int depth = 0; |
821 |
kumaneko |
1474 |
ccs_realpath_lock(); |
822 |
kumaneko |
1029 |
for (;;) { |
823 |
|
|
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
824 |
|
|
/* Global root? */ |
825 |
kumaneko |
1052 |
if (vfsmnt->mnt_parent == vfsmnt) |
826 |
|
|
break; |
827 |
kumaneko |
1029 |
dentry = vfsmnt->mnt_mountpoint; |
828 |
|
|
vfsmnt = vfsmnt->mnt_parent; |
829 |
|
|
continue; |
830 |
|
|
} |
831 |
|
|
dentry = dentry->d_parent; |
832 |
|
|
depth++; |
833 |
|
|
} |
834 |
kumaneko |
1474 |
ccs_realpath_unlock(); |
835 |
kumaneko |
1052 |
return depth; |
836 |
|
|
} |
837 |
|
|
|
838 |
|
|
/** |
839 |
kumaneko |
2002 |
* ccs_get_root_depth - return the depth of root directory. |
840 |
kumaneko |
1052 |
* |
841 |
|
|
* Returns number of directories to strip. |
842 |
|
|
*/ |
843 |
kumaneko |
2002 |
static int ccs_get_root_depth(void) |
844 |
kumaneko |
1052 |
{ |
845 |
|
|
int depth; |
846 |
|
|
struct dentry *dentry; |
847 |
|
|
struct vfsmount *vfsmnt; |
848 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
849 |
|
|
struct path root; |
850 |
|
|
#endif |
851 |
|
|
read_lock(¤t->fs->lock); |
852 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
853 |
|
|
root = current->fs->root; |
854 |
|
|
path_get(¤t->fs->root); |
855 |
|
|
dentry = root.dentry; |
856 |
|
|
vfsmnt = root.mnt; |
857 |
|
|
#else |
858 |
|
|
dentry = dget(current->fs->root); |
859 |
|
|
vfsmnt = mntget(current->fs->rootmnt); |
860 |
|
|
#endif |
861 |
|
|
read_unlock(¤t->fs->lock); |
862 |
kumaneko |
2002 |
depth = ccs_root_depth(dentry, vfsmnt); |
863 |
kumaneko |
1052 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
864 |
kumaneko |
1029 |
path_put(&root); |
865 |
|
|
#else |
866 |
kumaneko |
1052 |
dput(dentry); |
867 |
|
|
mntput(vfsmnt); |
868 |
kumaneko |
1029 |
#endif |
869 |
|
|
return depth; |
870 |
|
|
} |
871 |
|
|
|
872 |
kumaneko |
1052 |
/** |
873 |
kumaneko |
2002 |
* ccs_try_alt_exec - Try to start execute handler. |
874 |
kumaneko |
1052 |
* |
875 |
kumaneko |
2075 |
* @ee: Pointer to "struct ccs_execve_entry". |
876 |
kumaneko |
1052 |
* |
877 |
|
|
* Returns 0 on success, negative value otherwise. |
878 |
|
|
*/ |
879 |
kumaneko |
2037 |
static int ccs_try_alt_exec(struct ccs_execve_entry *ee) |
880 |
kumaneko |
1029 |
{ |
881 |
kumaneko |
1005 |
/* |
882 |
|
|
* Contents of modified bprm. |
883 |
|
|
* The envp[] in original bprm is moved to argv[] so that |
884 |
|
|
* the alternatively executed program won't be affected by |
885 |
kumaneko |
1064 |
* some dangerous environment variables like LD_PRELOAD. |
886 |
kumaneko |
1005 |
* |
887 |
|
|
* modified bprm->argc |
888 |
|
|
* = original bprm->argc + original bprm->envc + 7 |
889 |
|
|
* modified bprm->envc |
890 |
|
|
* = 0 |
891 |
|
|
* |
892 |
|
|
* modified bprm->argv[0] |
893 |
kumaneko |
1029 |
* = the program's name specified by execute_handler |
894 |
kumaneko |
1005 |
* modified bprm->argv[1] |
895 |
kumaneko |
2282 |
* = ccs_current_domain()->domainname->name |
896 |
kumaneko |
1005 |
* modified bprm->argv[2] |
897 |
|
|
* = the current process's name |
898 |
|
|
* modified bprm->argv[3] |
899 |
|
|
* = the current process's information (e.g. uid/gid). |
900 |
|
|
* modified bprm->argv[4] |
901 |
|
|
* = original bprm->filename |
902 |
|
|
* modified bprm->argv[5] |
903 |
|
|
* = original bprm->argc in string expression |
904 |
|
|
* modified bprm->argv[6] |
905 |
|
|
* = original bprm->envc in string expression |
906 |
|
|
* modified bprm->argv[7] |
907 |
|
|
* = original bprm->argv[0] |
908 |
|
|
* ... |
909 |
|
|
* modified bprm->argv[bprm->argc + 6] |
910 |
|
|
* = original bprm->argv[bprm->argc - 1] |
911 |
|
|
* modified bprm->argv[bprm->argc + 7] |
912 |
|
|
* = original bprm->envp[0] |
913 |
|
|
* ... |
914 |
|
|
* modified bprm->argv[bprm->envc + bprm->argc + 6] |
915 |
|
|
* = original bprm->envp[bprm->envc - 1] |
916 |
|
|
*/ |
917 |
kumaneko |
2037 |
struct linux_binprm *bprm = ee->bprm; |
918 |
kumaneko |
708 |
struct file *filp; |
919 |
|
|
int retval; |
920 |
kumaneko |
1005 |
const int original_argc = bprm->argc; |
921 |
|
|
const int original_envc = bprm->envc; |
922 |
|
|
struct task_struct *task = current; |
923 |
kumaneko |
1032 |
|
924 |
kumaneko |
1029 |
/* Close the requested program's dentry. */ |
925 |
kumaneko |
3064 |
ee->obj.path1.dentry = NULL; |
926 |
|
|
ee->obj.path1.mnt = NULL; |
927 |
|
|
ee->obj.validate_done = false; |
928 |
kumaneko |
708 |
allow_write_access(bprm->file); |
929 |
|
|
fput(bprm->file); |
930 |
|
|
bprm->file = NULL; |
931 |
kumaneko |
1005 |
|
932 |
kumaneko |
2037 |
/* Invalidate page dump cache. */ |
933 |
|
|
ee->dump.page = NULL; |
934 |
kumaneko |
1029 |
|
935 |
kumaneko |
1005 |
/* Move envp[] to argv[] */ |
936 |
|
|
bprm->argc += bprm->envc; |
937 |
|
|
bprm->envc = 0; |
938 |
|
|
|
939 |
|
|
/* Set argv[6] */ |
940 |
|
|
{ |
941 |
kumaneko |
2037 |
char *cp = ee->tmp; |
942 |
|
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_envc); |
943 |
|
|
retval = copy_strings_kernel(1, &cp, bprm); |
944 |
kumaneko |
1052 |
if (retval < 0) |
945 |
|
|
goto out; |
946 |
kumaneko |
1005 |
bprm->argc++; |
947 |
|
|
} |
948 |
|
|
|
949 |
|
|
/* Set argv[5] */ |
950 |
|
|
{ |
951 |
kumaneko |
2037 |
char *cp = ee->tmp; |
952 |
|
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_argc); |
953 |
|
|
retval = copy_strings_kernel(1, &cp, bprm); |
954 |
kumaneko |
1052 |
if (retval < 0) |
955 |
|
|
goto out; |
956 |
kumaneko |
1005 |
bprm->argc++; |
957 |
|
|
} |
958 |
|
|
|
959 |
|
|
/* Set argv[4] */ |
960 |
|
|
{ |
961 |
kumaneko |
2075 |
retval = copy_strings_kernel(1, &bprm->filename, bprm); |
962 |
kumaneko |
1052 |
if (retval < 0) |
963 |
|
|
goto out; |
964 |
kumaneko |
1005 |
bprm->argc++; |
965 |
|
|
} |
966 |
|
|
|
967 |
|
|
/* Set argv[3] */ |
968 |
|
|
{ |
969 |
kumaneko |
2037 |
char *cp = ee->tmp; |
970 |
kumaneko |
2282 |
const u32 ccs_flags = task->ccs_flags; |
971 |
kumaneko |
2037 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, |
972 |
kumaneko |
1052 |
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
973 |
|
|
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
974 |
|
|
"state[1]=%u state[2]=%u", |
975 |
kumaneko |
3502 |
(pid_t) ccsecurity_exports.sys_getpid(), |
976 |
|
|
current_uid(), current_gid(), current_euid(), |
977 |
|
|
current_egid(), current_suid(), current_sgid(), |
978 |
|
|
current_fsuid(), current_fsgid(), |
979 |
kumaneko |
2282 |
(u8) (ccs_flags >> 24), (u8) (ccs_flags >> 16), |
980 |
|
|
(u8) (ccs_flags >> 8)); |
981 |
kumaneko |
2037 |
retval = copy_strings_kernel(1, &cp, bprm); |
982 |
kumaneko |
1052 |
if (retval < 0) |
983 |
|
|
goto out; |
984 |
kumaneko |
1005 |
bprm->argc++; |
985 |
|
|
} |
986 |
|
|
|
987 |
|
|
/* Set argv[2] */ |
988 |
|
|
{ |
989 |
kumaneko |
1052 |
char *exe = (char *) ccs_get_exe(); |
990 |
kumaneko |
1005 |
if (exe) { |
991 |
|
|
retval = copy_strings_kernel(1, &exe, bprm); |
992 |
kumaneko |
2711 |
kfree(exe); |
993 |
kumaneko |
1005 |
} else { |
994 |
kumaneko |
2037 |
exe = ee->tmp; |
995 |
kumaneko |
2932 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "<unknown>"); |
996 |
kumaneko |
2037 |
retval = copy_strings_kernel(1, &exe, bprm); |
997 |
kumaneko |
1005 |
} |
998 |
kumaneko |
1052 |
if (retval < 0) |
999 |
|
|
goto out; |
1000 |
kumaneko |
1005 |
bprm->argc++; |
1001 |
|
|
} |
1002 |
|
|
|
1003 |
|
|
/* Set argv[1] */ |
1004 |
|
|
{ |
1005 |
kumaneko |
2037 |
char *cp = ee->tmp; |
1006 |
kumaneko |
2932 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s", |
1007 |
|
|
ccs_current_domain()->domainname->name); |
1008 |
kumaneko |
2037 |
retval = copy_strings_kernel(1, &cp, bprm); |
1009 |
kumaneko |
1052 |
if (retval < 0) |
1010 |
|
|
goto out; |
1011 |
kumaneko |
1005 |
bprm->argc++; |
1012 |
|
|
} |
1013 |
|
|
|
1014 |
|
|
/* Set argv[0] */ |
1015 |
|
|
{ |
1016 |
kumaneko |
2037 |
int depth = ccs_get_root_depth(); |
1017 |
kumaneko |
2932 |
int len = ee->handler->total_len + 1; |
1018 |
kumaneko |
3512 |
char *cp = kmalloc(len, CCS_GFP_FLAGS); |
1019 |
kumaneko |
2932 |
if (!cp) { |
1020 |
kumaneko |
2998 |
retval = -ENOMEM; |
1021 |
kumaneko |
2932 |
goto out; |
1022 |
|
|
} |
1023 |
|
|
ee->handler_path = cp; |
1024 |
|
|
memmove(cp, ee->handler->name, len); |
1025 |
kumaneko |
2037 |
ccs_unescape(cp); |
1026 |
|
|
retval = -ENOENT; |
1027 |
|
|
if (!*cp || *cp != '/') |
1028 |
|
|
goto out; |
1029 |
|
|
/* Adjust root directory for open_exec(). */ |
1030 |
|
|
while (depth) { |
1031 |
|
|
cp = strchr(cp + 1, '/'); |
1032 |
|
|
if (!cp) |
1033 |
|
|
goto out; |
1034 |
|
|
depth--; |
1035 |
|
|
} |
1036 |
kumaneko |
2932 |
memmove(ee->handler_path, cp, strlen(cp) + 1); |
1037 |
|
|
cp = ee->handler_path; |
1038 |
kumaneko |
2037 |
retval = copy_strings_kernel(1, &cp, bprm); |
1039 |
kumaneko |
1052 |
if (retval < 0) |
1040 |
|
|
goto out; |
1041 |
kumaneko |
1005 |
bprm->argc++; |
1042 |
|
|
} |
1043 |
kumaneko |
1052 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
1044 |
|
|
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) |
1045 |
kumaneko |
1007 |
bprm->argv_len = bprm->exec - bprm->p; |
1046 |
|
|
#endif |
1047 |
kumaneko |
1052 |
#endif |
1048 |
kumaneko |
1005 |
|
1049 |
kumaneko |
1029 |
/* OK, now restart the process with execute handler program's dentry. */ |
1050 |
kumaneko |
2932 |
filp = open_exec(ee->handler_path); |
1051 |
kumaneko |
1005 |
if (IS_ERR(filp)) { |
1052 |
|
|
retval = PTR_ERR(filp); |
1053 |
|
|
goto out; |
1054 |
|
|
} |
1055 |
kumaneko |
3064 |
ee->obj.path1.dentry = filp->f_dentry; |
1056 |
|
|
ee->obj.path1.mnt = filp->f_vfsmnt; |
1057 |
kumaneko |
1052 |
bprm->file = filp; |
1058 |
kumaneko |
2932 |
bprm->filename = ee->handler_path; |
1059 |
kumaneko |
1052 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1060 |
kumaneko |
2076 |
bprm->interp = bprm->filename; |
1061 |
kumaneko |
708 |
#endif |
1062 |
kumaneko |
1029 |
retval = prepare_binprm(bprm); |
1063 |
kumaneko |
1052 |
if (retval < 0) |
1064 |
|
|
goto out; |
1065 |
kumaneko |
2932 |
task->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1066 |
|
|
retval = ccs_find_next_domain(ee); |
1067 |
|
|
task->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1068 |
kumaneko |
1005 |
out: |
1069 |
|
|
return retval; |
1070 |
kumaneko |
708 |
} |
1071 |
kumaneko |
581 |
|
1072 |
kumaneko |
1052 |
/** |
1073 |
kumaneko |
2002 |
* ccs_find_execute_handler - Find an execute handler. |
1074 |
kumaneko |
1052 |
* |
1075 |
kumaneko |
2037 |
* @ee: Pointer to "struct ccs_execve_entry". |
1076 |
kumaneko |
1052 |
* @type: Type of execute handler. |
1077 |
|
|
* |
1078 |
kumaneko |
2075 |
* Returns true if found, false otherwise. |
1079 |
kumaneko |
2690 |
* |
1080 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
1081 |
kumaneko |
1052 |
*/ |
1082 |
kumaneko |
2037 |
static bool ccs_find_execute_handler(struct ccs_execve_entry *ee, |
1083 |
|
|
const u8 type) |
1084 |
kumaneko |
1029 |
{ |
1085 |
kumaneko |
1064 |
struct task_struct *task = current; |
1086 |
kumaneko |
2282 |
const struct ccs_domain_info *domain = ccs_current_domain(); |
1087 |
kumaneko |
2002 |
struct ccs_acl_info *ptr; |
1088 |
kumaneko |
2540 |
bool found = false; |
1089 |
kumaneko |
1064 |
/* |
1090 |
|
|
* Don't use execute handler if the current process is |
1091 |
|
|
* marked as execute handler to avoid infinite execute handler loop. |
1092 |
|
|
*/ |
1093 |
kumaneko |
2282 |
if (task->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER) |
1094 |
kumaneko |
2037 |
return false; |
1095 |
kumaneko |
2540 |
list_for_each_entry(ptr, &domain->acl_info_list, list) { |
1096 |
kumaneko |
2002 |
struct ccs_execute_handler_record *acl; |
1097 |
kumaneko |
1058 |
if (ptr->type != type) |
1098 |
kumaneko |
1052 |
continue; |
1099 |
kumaneko |
2002 |
acl = container_of(ptr, struct ccs_execute_handler_record, |
1100 |
|
|
head); |
1101 |
kumaneko |
2037 |
ee->handler = acl->handler; |
1102 |
kumaneko |
2540 |
found = true; |
1103 |
|
|
break; |
1104 |
kumaneko |
1029 |
} |
1105 |
kumaneko |
2540 |
return found; |
1106 |
kumaneko |
1029 |
} |
1107 |
|
|
|
1108 |
kumaneko |
1052 |
/** |
1109 |
kumaneko |
2037 |
* ccs_dump_page - Dump a page to buffer. |
1110 |
kumaneko |
1657 |
* |
1111 |
kumaneko |
2037 |
* @bprm: Pointer to "struct linux_binprm". |
1112 |
|
|
* @pos: Location to dump. |
1113 |
|
|
* @dump: Poiner to "struct ccs_page_dump". |
1114 |
kumaneko |
1657 |
* |
1115 |
kumaneko |
2037 |
* Returns true on success, false otherwise. |
1116 |
kumaneko |
1657 |
*/ |
1117 |
kumaneko |
2037 |
bool ccs_dump_page(struct linux_binprm *bprm, unsigned long pos, |
1118 |
|
|
struct ccs_page_dump *dump) |
1119 |
kumaneko |
1657 |
{ |
1120 |
kumaneko |
2037 |
struct page *page; |
1121 |
kumaneko |
3056 |
/* dump->data is released by ccs_finish_execve(). */ |
1122 |
kumaneko |
2037 |
if (!dump->data) { |
1123 |
kumaneko |
3512 |
dump->data = kzalloc(PAGE_SIZE, CCS_GFP_FLAGS); |
1124 |
kumaneko |
2037 |
if (!dump->data) |
1125 |
|
|
return false; |
1126 |
|
|
} |
1127 |
|
|
/* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ |
1128 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1129 |
|
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1130 |
|
|
return false; |
1131 |
kumaneko |
2996 |
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR >= 3 && defined(CONFIG_MMU) |
1132 |
kumaneko |
2346 |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1133 |
|
|
return false; |
1134 |
kumaneko |
3018 |
#elif defined(AX_MAJOR) && AX_MAJOR == 3 && defined(AX_MINOR) && AX_MINOR >= 2 && defined(CONFIG_MMU) |
1135 |
|
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1136 |
|
|
return false; |
1137 |
kumaneko |
2037 |
#else |
1138 |
|
|
page = bprm->page[pos / PAGE_SIZE]; |
1139 |
|
|
#endif |
1140 |
|
|
if (page != dump->page) { |
1141 |
|
|
const unsigned int offset = pos % PAGE_SIZE; |
1142 |
|
|
/* |
1143 |
|
|
* Maybe kmap()/kunmap() should be used here. |
1144 |
|
|
* But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). |
1145 |
|
|
* So do I. |
1146 |
|
|
*/ |
1147 |
|
|
char *kaddr = kmap_atomic(page, KM_USER0); |
1148 |
|
|
dump->page = page; |
1149 |
|
|
memcpy(dump->data + offset, kaddr + offset, PAGE_SIZE - offset); |
1150 |
|
|
kunmap_atomic(kaddr, KM_USER0); |
1151 |
|
|
} |
1152 |
|
|
/* Same with put_arg_page(page) in fs/exec.c */ |
1153 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1154 |
|
|
put_page(page); |
1155 |
kumaneko |
2996 |
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR >= 3 && defined(CONFIG_MMU) |
1156 |
kumaneko |
2346 |
put_page(page); |
1157 |
kumaneko |
3018 |
#elif defined(AX_MAJOR) && AX_MAJOR == 3 && defined(AX_MINOR) && AX_MINOR >= 2 && defined(CONFIG_MMU) |
1158 |
|
|
put_page(page); |
1159 |
kumaneko |
2037 |
#endif |
1160 |
|
|
return true; |
1161 |
kumaneko |
1657 |
} |
1162 |
|
|
|
1163 |
|
|
/** |
1164 |
kumaneko |
2037 |
* ccs_start_execve - Prepare for execve() operation. |
1165 |
kumaneko |
1052 |
* |
1166 |
|
|
* @bprm: Pointer to "struct linux_binprm". |
1167 |
kumaneko |
3056 |
* @eep: Pointer to "struct ccs_execve_entry *". |
1168 |
kumaneko |
1052 |
* |
1169 |
kumaneko |
2037 |
* Returns 0 on success, negative value otherwise. |
1170 |
kumaneko |
1052 |
*/ |
1171 |
kumaneko |
3502 |
static int ccs_start_execve(struct linux_binprm *bprm, |
1172 |
|
|
struct ccs_execve_entry **eep) |
1173 |
kumaneko |
115 |
{ |
1174 |
kumaneko |
1657 |
int retval; |
1175 |
kumaneko |
1029 |
struct task_struct *task = current; |
1176 |
kumaneko |
3056 |
struct ccs_execve_entry *ee; |
1177 |
|
|
*eep = NULL; |
1178 |
kumaneko |
3512 |
ee = kzalloc(sizeof(*ee), CCS_GFP_FLAGS); |
1179 |
kumaneko |
2037 |
if (!ee) |
1180 |
kumaneko |
1052 |
return -ENOMEM; |
1181 |
kumaneko |
3512 |
ee->tmp = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); |
1182 |
kumaneko |
3056 |
if (!ee->tmp) { |
1183 |
|
|
kfree(ee); |
1184 |
|
|
return -ENOMEM; |
1185 |
|
|
} |
1186 |
|
|
ee->reader_idx = ccs_read_lock(); |
1187 |
|
|
/* ee->dump->data is allocated by ccs_dump_page(). */ |
1188 |
|
|
ee->previous_domain = task->ccs_domain_info; |
1189 |
|
|
/* Clear manager flag. */ |
1190 |
|
|
task->ccs_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
1191 |
|
|
*eep = ee; |
1192 |
kumaneko |
2943 |
ccs_init_request_info(&ee->r, NULL, CCS_MAC_FILE_EXECUTE); |
1193 |
kumaneko |
2037 |
ee->r.ee = ee; |
1194 |
|
|
ee->bprm = bprm; |
1195 |
|
|
ee->r.obj = &ee->obj; |
1196 |
kumaneko |
2915 |
ee->obj.path1.dentry = bprm->file->f_dentry; |
1197 |
|
|
ee->obj.path1.mnt = bprm->file->f_vfsmnt; |
1198 |
kumaneko |
2892 |
if (ccs_find_execute_handler(ee, CCS_TYPE_EXECUTE_HANDLER)) { |
1199 |
kumaneko |
2037 |
retval = ccs_try_alt_exec(ee); |
1200 |
kumaneko |
1052 |
if (!retval) |
1201 |
kumaneko |
2037 |
ccs_audit_execute_handler_log(ee, true); |
1202 |
kumaneko |
1052 |
goto ok; |
1203 |
kumaneko |
708 |
} |
1204 |
kumaneko |
2037 |
retval = ccs_find_next_domain(ee); |
1205 |
kumaneko |
1052 |
if (retval != -EPERM) |
1206 |
|
|
goto ok; |
1207 |
kumaneko |
2892 |
if (ccs_find_execute_handler(ee, CCS_TYPE_DENIED_EXECUTE_HANDLER)) { |
1208 |
kumaneko |
2037 |
retval = ccs_try_alt_exec(ee); |
1209 |
kumaneko |
1052 |
if (!retval) |
1210 |
kumaneko |
2037 |
ccs_audit_execute_handler_log(ee, false); |
1211 |
kumaneko |
1052 |
} |
1212 |
|
|
ok: |
1213 |
kumaneko |
1561 |
if (retval < 0) |
1214 |
kumaneko |
1052 |
goto out; |
1215 |
kumaneko |
2968 |
/* |
1216 |
kumaneko |
3261 |
* Tell GC that I started execve(). |
1217 |
|
|
* Also, tell open_exec() to check read permission. |
1218 |
|
|
*/ |
1219 |
|
|
task->ccs_flags |= CCS_TASK_IS_IN_EXECVE; |
1220 |
|
|
/* |
1221 |
|
|
* Make task->ccs_flags visible to GC before changing |
1222 |
|
|
* task->ccs_domain_info . |
1223 |
|
|
*/ |
1224 |
|
|
smp_mb(); |
1225 |
|
|
/* |
1226 |
kumaneko |
2968 |
* Proceed to the next domain in order to allow reaching via PID. |
1227 |
|
|
* It will be reverted if execve() failed. Reverting is not good. |
1228 |
|
|
* But it is better than being unable to reach via PID in interactive |
1229 |
|
|
* enforcing mode. |
1230 |
|
|
*/ |
1231 |
|
|
task->ccs_domain_info = ee->r.domain; |
1232 |
kumaneko |
2960 |
ee->r.mode = ccs_get_mode(ee->r.domain->profile, CCS_MAC_ENVIRON); |
1233 |
kumaneko |
2922 |
retval = ccs_environ(ee); |
1234 |
kumaneko |
1561 |
if (retval < 0) |
1235 |
kumaneko |
1052 |
goto out; |
1236 |
kumaneko |
2037 |
retval = 0; |
1237 |
|
|
out: |
1238 |
|
|
return retval; |
1239 |
|
|
} |
1240 |
|
|
|
1241 |
|
|
/** |
1242 |
|
|
* ccs_finish_execve - Clean up execve() operation. |
1243 |
kumaneko |
2076 |
* |
1244 |
|
|
* @retval: Return code of an execve() operation. |
1245 |
kumaneko |
3056 |
* @ee: Pointer to "struct ccs_execve_entry". |
1246 |
kumaneko |
2690 |
* |
1247 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
1248 |
kumaneko |
2037 |
*/ |
1249 |
kumaneko |
3502 |
static void ccs_finish_execve(int retval, struct ccs_execve_entry *ee) |
1250 |
kumaneko |
2037 |
{ |
1251 |
|
|
struct task_struct *task = current; |
1252 |
|
|
if (!ee) |
1253 |
|
|
return; |
1254 |
kumaneko |
2968 |
if (retval < 0) { |
1255 |
|
|
task->ccs_domain_info = ee->previous_domain; |
1256 |
kumaneko |
3056 |
/* |
1257 |
|
|
* Make task->ccs_domain_info visible to GC before changing |
1258 |
|
|
* task->ccs_flags . |
1259 |
|
|
*/ |
1260 |
|
|
smp_mb(); |
1261 |
|
|
} else { |
1262 |
|
|
/* Mark the current process as execute handler. */ |
1263 |
|
|
if (ee->handler) |
1264 |
|
|
task->ccs_flags |= CCS_TASK_IS_EXECUTE_HANDLER; |
1265 |
|
|
/* Mark the current process as normal process. */ |
1266 |
|
|
else |
1267 |
|
|
task->ccs_flags &= ~CCS_TASK_IS_EXECUTE_HANDLER; |
1268 |
kumaneko |
2968 |
} |
1269 |
kumaneko |
3056 |
/* Tell GC that I finished execve(). */ |
1270 |
|
|
task->ccs_flags &= ~CCS_TASK_IS_IN_EXECVE; |
1271 |
|
|
ccs_read_unlock(ee->reader_idx); |
1272 |
|
|
kfree(ee->handler_path); |
1273 |
|
|
kfree(ee->tmp); |
1274 |
|
|
kfree(ee->dump.data); |
1275 |
|
|
kfree(ee); |
1276 |
kumaneko |
115 |
} |
1277 |
kumaneko |
3484 |
|
1278 |
|
|
/** |
1279 |
|
|
* ccs_may_transit - Check permission and do domain transition without execve(). |
1280 |
|
|
* |
1281 |
|
|
* @domainname: Domainname to transit to. |
1282 |
|
|
* @pathname: Pathname to check. |
1283 |
|
|
* |
1284 |
|
|
* Returns 0 on success, negative value otherwise. |
1285 |
|
|
* |
1286 |
|
|
* Caller holds ccs_read_lock(). |
1287 |
|
|
*/ |
1288 |
kumaneko |
3512 |
int ccs_may_transit(const char *domainname, const char *pathname) |
1289 |
|
|
{ |
1290 |
kumaneko |
3484 |
struct ccs_path_info name; |
1291 |
|
|
struct ccs_request_info r; |
1292 |
|
|
struct ccs_domain_info *domain; |
1293 |
|
|
int error; |
1294 |
|
|
name.name = pathname; |
1295 |
|
|
ccs_fill_path_info(&name); |
1296 |
|
|
/* Check allow_transit permission. */ |
1297 |
|
|
ccs_init_request_info(&r, NULL, CCS_MAC_FILE_TRANSIT); |
1298 |
|
|
error = ccs_path_permission(&r, CCS_TYPE_TRANSIT, &name); |
1299 |
|
|
if (error) |
1300 |
|
|
return error; |
1301 |
|
|
/* Check destination domain. */ |
1302 |
|
|
domain = ccs_find_domain(domainname); |
1303 |
|
|
if (!domain && r.mode != CCS_CONFIG_ENFORCING && |
1304 |
|
|
strlen(domainname) < CCS_EXEC_TMPSIZE - 10) { |
1305 |
|
|
domain = ccs_find_or_assign_new_domain(domainname, r.profile); |
1306 |
|
|
if (domain) |
1307 |
|
|
ccs_audit_domain_creation_log(domain); |
1308 |
|
|
} |
1309 |
|
|
if (domain) { |
1310 |
|
|
error = 0; |
1311 |
|
|
current->ccs_domain_info = domain; |
1312 |
|
|
} else { |
1313 |
|
|
error = -ENOENT; |
1314 |
|
|
} |
1315 |
|
|
return error; |
1316 |
|
|
} |
1317 |
kumaneko |
3502 |
|
1318 |
|
|
static int __ccs_search_binary_handler(struct linux_binprm *bprm, |
1319 |
|
|
struct pt_regs *regs) |
1320 |
|
|
{ |
1321 |
|
|
struct ccs_execve_entry *ee; |
1322 |
|
|
int retval; |
1323 |
|
|
if (!ccs_policy_loaded) |
1324 |
|
|
ccsecurity_exports.load_policy(bprm->filename); |
1325 |
|
|
retval = ccs_start_execve(bprm, &ee); |
1326 |
|
|
if (!retval) |
1327 |
|
|
retval = search_binary_handler(bprm, regs); |
1328 |
|
|
ccs_finish_execve(retval, ee); |
1329 |
|
|
return retval; |
1330 |
|
|
} |
1331 |
|
|
|
1332 |
|
|
void __init ccs_domain_init(void) |
1333 |
|
|
{ |
1334 |
|
|
ccsecurity_ops.search_binary_handler = __ccs_search_binary_handler; |
1335 |
|
|
} |