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Commit | Line | Data |
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1da177e4 LT |
1 | /* Updated: Karl MacMillan <kmacmillan@tresys.com> |
2 | * | |
3 | * Added conditional policy language extensions | |
4 | * | |
5 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC | |
6 | * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, version 2. | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/pagemap.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/vmalloc.h> | |
16 | #include <linux/fs.h> | |
bb003079 | 17 | #include <linux/mutex.h> |
1da177e4 LT |
18 | #include <linux/init.h> |
19 | #include <linux/string.h> | |
20 | #include <linux/security.h> | |
21 | #include <linux/major.h> | |
22 | #include <linux/seq_file.h> | |
23 | #include <linux/percpu.h> | |
af601e46 | 24 | #include <linux/audit.h> |
1da177e4 LT |
25 | #include <asm/uaccess.h> |
26 | #include <asm/semaphore.h> | |
27 | ||
28 | /* selinuxfs pseudo filesystem for exporting the security policy API. | |
29 | Based on the proc code and the fs/nfsd/nfsctl.c code. */ | |
30 | ||
31 | #include "flask.h" | |
32 | #include "avc.h" | |
33 | #include "avc_ss.h" | |
34 | #include "security.h" | |
35 | #include "objsec.h" | |
36 | #include "conditional.h" | |
37 | ||
38 | unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; | |
39 | ||
4e5ab4cb JM |
40 | #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT |
41 | #define SELINUX_COMPAT_NET_VALUE 0 | |
42 | #else | |
43 | #define SELINUX_COMPAT_NET_VALUE 1 | |
44 | #endif | |
45 | ||
46 | int selinux_compat_net = SELINUX_COMPAT_NET_VALUE; | |
47 | ||
1da177e4 LT |
48 | static int __init checkreqprot_setup(char *str) |
49 | { | |
50 | selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0; | |
51 | return 1; | |
52 | } | |
53 | __setup("checkreqprot=", checkreqprot_setup); | |
54 | ||
4e5ab4cb JM |
55 | static int __init selinux_compat_net_setup(char *str) |
56 | { | |
57 | selinux_compat_net = simple_strtoul(str,NULL,0) ? 1 : 0; | |
58 | return 1; | |
59 | } | |
60 | __setup("selinux_compat_net=", selinux_compat_net_setup); | |
61 | ||
1da177e4 | 62 | |
bb003079 | 63 | static DEFINE_MUTEX(sel_mutex); |
1da177e4 LT |
64 | |
65 | /* global data for booleans */ | |
66 | static struct dentry *bool_dir = NULL; | |
67 | static int bool_num = 0; | |
68 | static int *bool_pending_values = NULL; | |
69 | ||
e47c8fc5 CP |
70 | /* global data for classes */ |
71 | static struct dentry *class_dir = NULL; | |
72 | static unsigned long last_class_ino; | |
73 | ||
1da177e4 LT |
74 | extern void selnl_notify_setenforce(int val); |
75 | ||
76 | /* Check whether a task is allowed to use a security operation. */ | |
77 | static int task_has_security(struct task_struct *tsk, | |
78 | u32 perms) | |
79 | { | |
80 | struct task_security_struct *tsec; | |
81 | ||
82 | tsec = tsk->security; | |
83 | if (!tsec) | |
84 | return -EACCES; | |
85 | ||
86 | return avc_has_perm(tsec->sid, SECINITSID_SECURITY, | |
87 | SECCLASS_SECURITY, perms, NULL); | |
88 | } | |
89 | ||
90 | enum sel_inos { | |
91 | SEL_ROOT_INO = 2, | |
92 | SEL_LOAD, /* load policy */ | |
93 | SEL_ENFORCE, /* get or set enforcing status */ | |
94 | SEL_CONTEXT, /* validate context */ | |
95 | SEL_ACCESS, /* compute access decision */ | |
96 | SEL_CREATE, /* compute create labeling decision */ | |
97 | SEL_RELABEL, /* compute relabeling decision */ | |
98 | SEL_USER, /* compute reachable user contexts */ | |
99 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
100 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
101 | SEL_MLS, /* return if MLS policy is enabled */ | |
102 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
1da177e4 LT |
103 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
104 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 105 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
3f12070e EP |
106 | SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ |
107 | SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ | |
6174eafc | 108 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
109 | }; |
110 | ||
6174eafc JC |
111 | static unsigned long sel_last_ino = SEL_INO_NEXT - 1; |
112 | ||
f0ee2e46 | 113 | #define SEL_INITCON_INO_OFFSET 0x01000000 |
bce34bc0 | 114 | #define SEL_BOOL_INO_OFFSET 0x02000000 |
e47c8fc5 | 115 | #define SEL_CLASS_INO_OFFSET 0x04000000 |
f0ee2e46 JC |
116 | #define SEL_INO_MASK 0x00ffffff |
117 | ||
1da177e4 LT |
118 | #define TMPBUFLEN 12 |
119 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
120 | size_t count, loff_t *ppos) | |
121 | { | |
122 | char tmpbuf[TMPBUFLEN]; | |
123 | ssize_t length; | |
124 | ||
125 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); | |
126 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
127 | } | |
128 | ||
129 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
130 | static ssize_t sel_write_enforce(struct file * file, const char __user * buf, | |
131 | size_t count, loff_t *ppos) | |
132 | ||
133 | { | |
134 | char *page; | |
135 | ssize_t length; | |
136 | int new_value; | |
137 | ||
bfd51626 | 138 | if (count >= PAGE_SIZE) |
1da177e4 LT |
139 | return -ENOMEM; |
140 | if (*ppos != 0) { | |
141 | /* No partial writes. */ | |
142 | return -EINVAL; | |
143 | } | |
144 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
145 | if (!page) | |
146 | return -ENOMEM; | |
147 | length = -EFAULT; | |
148 | if (copy_from_user(page, buf, count)) | |
149 | goto out; | |
150 | ||
151 | length = -EINVAL; | |
152 | if (sscanf(page, "%d", &new_value) != 1) | |
153 | goto out; | |
154 | ||
155 | if (new_value != selinux_enforcing) { | |
156 | length = task_has_security(current, SECURITY__SETENFORCE); | |
157 | if (length) | |
158 | goto out; | |
af601e46 SG |
159 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
160 | "enforcing=%d old_enforcing=%d auid=%u", new_value, | |
161 | selinux_enforcing, | |
162 | audit_get_loginuid(current->audit_context)); | |
1da177e4 LT |
163 | selinux_enforcing = new_value; |
164 | if (selinux_enforcing) | |
165 | avc_ss_reset(0); | |
166 | selnl_notify_setenforce(selinux_enforcing); | |
167 | } | |
168 | length = count; | |
169 | out: | |
170 | free_page((unsigned long) page); | |
171 | return length; | |
172 | } | |
173 | #else | |
174 | #define sel_write_enforce NULL | |
175 | #endif | |
176 | ||
9c2e08c5 | 177 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
178 | .read = sel_read_enforce, |
179 | .write = sel_write_enforce, | |
180 | }; | |
181 | ||
3f12070e EP |
182 | static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, |
183 | size_t count, loff_t *ppos) | |
184 | { | |
185 | char tmpbuf[TMPBUFLEN]; | |
186 | ssize_t length; | |
187 | ino_t ino = filp->f_path.dentry->d_inode->i_ino; | |
188 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? | |
189 | security_get_reject_unknown() : !security_get_allow_unknown(); | |
190 | ||
191 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
192 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
193 | } | |
194 | ||
195 | static const struct file_operations sel_handle_unknown_ops = { | |
196 | .read = sel_read_handle_unknown, | |
197 | }; | |
198 | ||
1da177e4 LT |
199 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
200 | static ssize_t sel_write_disable(struct file * file, const char __user * buf, | |
201 | size_t count, loff_t *ppos) | |
202 | ||
203 | { | |
204 | char *page; | |
205 | ssize_t length; | |
206 | int new_value; | |
207 | extern int selinux_disable(void); | |
208 | ||
bfd51626 | 209 | if (count >= PAGE_SIZE) |
1da177e4 LT |
210 | return -ENOMEM; |
211 | if (*ppos != 0) { | |
212 | /* No partial writes. */ | |
213 | return -EINVAL; | |
214 | } | |
215 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
216 | if (!page) | |
217 | return -ENOMEM; | |
218 | length = -EFAULT; | |
219 | if (copy_from_user(page, buf, count)) | |
220 | goto out; | |
221 | ||
222 | length = -EINVAL; | |
223 | if (sscanf(page, "%d", &new_value) != 1) | |
224 | goto out; | |
225 | ||
226 | if (new_value) { | |
227 | length = selinux_disable(); | |
228 | if (length < 0) | |
229 | goto out; | |
af601e46 SG |
230 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
231 | "selinux=0 auid=%u", | |
232 | audit_get_loginuid(current->audit_context)); | |
1da177e4 LT |
233 | } |
234 | ||
235 | length = count; | |
236 | out: | |
237 | free_page((unsigned long) page); | |
238 | return length; | |
239 | } | |
240 | #else | |
241 | #define sel_write_disable NULL | |
242 | #endif | |
243 | ||
9c2e08c5 | 244 | static const struct file_operations sel_disable_ops = { |
1da177e4 LT |
245 | .write = sel_write_disable, |
246 | }; | |
247 | ||
248 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
249 | size_t count, loff_t *ppos) | |
250 | { | |
251 | char tmpbuf[TMPBUFLEN]; | |
252 | ssize_t length; | |
253 | ||
254 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
255 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
256 | } | |
257 | ||
9c2e08c5 | 258 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 LT |
259 | .read = sel_read_policyvers, |
260 | }; | |
261 | ||
262 | /* declaration for sel_write_load */ | |
263 | static int sel_make_bools(void); | |
e47c8fc5 CP |
264 | static int sel_make_classes(void); |
265 | ||
266 | /* declaration for sel_make_class_dirs */ | |
267 | static int sel_make_dir(struct inode *dir, struct dentry *dentry, | |
268 | unsigned long *ino); | |
1da177e4 LT |
269 | |
270 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
271 | size_t count, loff_t *ppos) | |
272 | { | |
273 | char tmpbuf[TMPBUFLEN]; | |
274 | ssize_t length; | |
275 | ||
276 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled); | |
277 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
278 | } | |
279 | ||
9c2e08c5 | 280 | static const struct file_operations sel_mls_ops = { |
1da177e4 LT |
281 | .read = sel_read_mls, |
282 | }; | |
283 | ||
284 | static ssize_t sel_write_load(struct file * file, const char __user * buf, | |
285 | size_t count, loff_t *ppos) | |
286 | ||
287 | { | |
288 | int ret; | |
289 | ssize_t length; | |
290 | void *data = NULL; | |
291 | ||
bb003079 | 292 | mutex_lock(&sel_mutex); |
1da177e4 LT |
293 | |
294 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
295 | if (length) | |
296 | goto out; | |
297 | ||
298 | if (*ppos != 0) { | |
299 | /* No partial writes. */ | |
300 | length = -EINVAL; | |
301 | goto out; | |
302 | } | |
303 | ||
bfd51626 | 304 | if ((count > 64 * 1024 * 1024) |
1da177e4 LT |
305 | || (data = vmalloc(count)) == NULL) { |
306 | length = -ENOMEM; | |
307 | goto out; | |
308 | } | |
309 | ||
310 | length = -EFAULT; | |
311 | if (copy_from_user(data, buf, count) != 0) | |
312 | goto out; | |
313 | ||
314 | length = security_load_policy(data, count); | |
315 | if (length) | |
316 | goto out; | |
317 | ||
318 | ret = sel_make_bools(); | |
e47c8fc5 CP |
319 | if (ret) { |
320 | length = ret; | |
321 | goto out1; | |
322 | } | |
323 | ||
324 | ret = sel_make_classes(); | |
1da177e4 LT |
325 | if (ret) |
326 | length = ret; | |
327 | else | |
328 | length = count; | |
e47c8fc5 CP |
329 | |
330 | out1: | |
3f12070e EP |
331 | |
332 | printk(KERN_INFO "SELinux: policy loaded with handle_unknown=%s\n", | |
333 | (security_get_reject_unknown() ? "reject" : | |
334 | (security_get_allow_unknown() ? "allow" : "deny"))); | |
335 | ||
af601e46 SG |
336 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
337 | "policy loaded auid=%u", | |
338 | audit_get_loginuid(current->audit_context)); | |
1da177e4 | 339 | out: |
bb003079 | 340 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
341 | vfree(data); |
342 | return length; | |
343 | } | |
344 | ||
9c2e08c5 | 345 | static const struct file_operations sel_load_ops = { |
1da177e4 LT |
346 | .write = sel_write_load, |
347 | }; | |
348 | ||
ce9982d0 | 349 | static ssize_t sel_write_context(struct file * file, char *buf, size_t size) |
1da177e4 | 350 | { |
ce9982d0 SS |
351 | char *canon; |
352 | u32 sid, len; | |
1da177e4 LT |
353 | ssize_t length; |
354 | ||
355 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
356 | if (length) | |
357 | return length; | |
358 | ||
ce9982d0 SS |
359 | length = security_context_to_sid(buf, size, &sid); |
360 | if (length < 0) | |
361 | return length; | |
1da177e4 | 362 | |
ce9982d0 | 363 | length = security_sid_to_context(sid, &canon, &len); |
1da177e4 | 364 | if (length < 0) |
ce9982d0 SS |
365 | return length; |
366 | ||
367 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
368 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
369 | "max\n", __FUNCTION__, len); | |
370 | length = -ERANGE; | |
1da177e4 | 371 | goto out; |
ce9982d0 | 372 | } |
1da177e4 | 373 | |
ce9982d0 SS |
374 | memcpy(buf, canon, len); |
375 | length = len; | |
1da177e4 | 376 | out: |
ce9982d0 | 377 | kfree(canon); |
1da177e4 LT |
378 | return length; |
379 | } | |
380 | ||
1da177e4 LT |
381 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
382 | size_t count, loff_t *ppos) | |
383 | { | |
384 | char tmpbuf[TMPBUFLEN]; | |
385 | ssize_t length; | |
386 | ||
387 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
388 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
389 | } | |
390 | ||
391 | static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf, | |
392 | size_t count, loff_t *ppos) | |
393 | { | |
394 | char *page; | |
395 | ssize_t length; | |
396 | unsigned int new_value; | |
397 | ||
398 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
399 | if (length) | |
400 | return length; | |
401 | ||
bfd51626 | 402 | if (count >= PAGE_SIZE) |
1da177e4 LT |
403 | return -ENOMEM; |
404 | if (*ppos != 0) { | |
405 | /* No partial writes. */ | |
406 | return -EINVAL; | |
407 | } | |
408 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
409 | if (!page) | |
410 | return -ENOMEM; | |
411 | length = -EFAULT; | |
412 | if (copy_from_user(page, buf, count)) | |
413 | goto out; | |
414 | ||
415 | length = -EINVAL; | |
416 | if (sscanf(page, "%u", &new_value) != 1) | |
417 | goto out; | |
418 | ||
419 | selinux_checkreqprot = new_value ? 1 : 0; | |
420 | length = count; | |
421 | out: | |
422 | free_page((unsigned long) page); | |
423 | return length; | |
424 | } | |
9c2e08c5 | 425 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
426 | .read = sel_read_checkreqprot, |
427 | .write = sel_write_checkreqprot, | |
428 | }; | |
429 | ||
4e5ab4cb JM |
430 | static ssize_t sel_read_compat_net(struct file *filp, char __user *buf, |
431 | size_t count, loff_t *ppos) | |
432 | { | |
433 | char tmpbuf[TMPBUFLEN]; | |
434 | ssize_t length; | |
435 | ||
436 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net); | |
437 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
438 | } | |
439 | ||
440 | static ssize_t sel_write_compat_net(struct file * file, const char __user * buf, | |
441 | size_t count, loff_t *ppos) | |
442 | { | |
443 | char *page; | |
444 | ssize_t length; | |
445 | int new_value; | |
446 | ||
447 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
448 | if (length) | |
449 | return length; | |
450 | ||
451 | if (count >= PAGE_SIZE) | |
452 | return -ENOMEM; | |
453 | if (*ppos != 0) { | |
454 | /* No partial writes. */ | |
455 | return -EINVAL; | |
456 | } | |
457 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
458 | if (!page) | |
459 | return -ENOMEM; | |
460 | length = -EFAULT; | |
461 | if (copy_from_user(page, buf, count)) | |
462 | goto out; | |
463 | ||
464 | length = -EINVAL; | |
465 | if (sscanf(page, "%d", &new_value) != 1) | |
466 | goto out; | |
467 | ||
468 | selinux_compat_net = new_value ? 1 : 0; | |
469 | length = count; | |
470 | out: | |
471 | free_page((unsigned long) page); | |
472 | return length; | |
473 | } | |
9c2e08c5 | 474 | static const struct file_operations sel_compat_net_ops = { |
4e5ab4cb JM |
475 | .read = sel_read_compat_net, |
476 | .write = sel_write_compat_net, | |
477 | }; | |
478 | ||
1da177e4 LT |
479 | /* |
480 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
481 | */ | |
482 | static ssize_t sel_write_access(struct file * file, char *buf, size_t size); | |
483 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size); | |
484 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size); | |
485 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size); | |
486 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size); | |
487 | ||
488 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
489 | [SEL_ACCESS] = sel_write_access, | |
490 | [SEL_CREATE] = sel_write_create, | |
491 | [SEL_RELABEL] = sel_write_relabel, | |
492 | [SEL_USER] = sel_write_user, | |
493 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 494 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
495 | }; |
496 | ||
497 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
498 | { | |
3d5ff529 | 499 | ino_t ino = file->f_path.dentry->d_inode->i_ino; |
1da177e4 LT |
500 | char *data; |
501 | ssize_t rv; | |
502 | ||
6e20a64a | 503 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
504 | return -EINVAL; |
505 | ||
506 | data = simple_transaction_get(file, buf, size); | |
507 | if (IS_ERR(data)) | |
508 | return PTR_ERR(data); | |
509 | ||
510 | rv = write_op[ino](file, data, size); | |
511 | if (rv>0) { | |
512 | simple_transaction_set(file, rv); | |
513 | rv = size; | |
514 | } | |
515 | return rv; | |
516 | } | |
517 | ||
9c2e08c5 | 518 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
519 | .write = selinux_transaction_write, |
520 | .read = simple_transaction_read, | |
521 | .release = simple_transaction_release, | |
522 | }; | |
523 | ||
524 | /* | |
525 | * payload - write methods | |
526 | * If the method has a response, the response should be put in buf, | |
527 | * and the length returned. Otherwise return 0 or and -error. | |
528 | */ | |
529 | ||
530 | static ssize_t sel_write_access(struct file * file, char *buf, size_t size) | |
531 | { | |
532 | char *scon, *tcon; | |
533 | u32 ssid, tsid; | |
534 | u16 tclass; | |
535 | u32 req; | |
536 | struct av_decision avd; | |
537 | ssize_t length; | |
538 | ||
539 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
540 | if (length) | |
541 | return length; | |
542 | ||
543 | length = -ENOMEM; | |
89d155ef | 544 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
545 | if (!scon) |
546 | return length; | |
1da177e4 | 547 | |
89d155ef | 548 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
549 | if (!tcon) |
550 | goto out; | |
1da177e4 LT |
551 | |
552 | length = -EINVAL; | |
553 | if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4) | |
554 | goto out2; | |
555 | ||
556 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
557 | if (length < 0) | |
558 | goto out2; | |
559 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
560 | if (length < 0) | |
561 | goto out2; | |
562 | ||
563 | length = security_compute_av(ssid, tsid, tclass, req, &avd); | |
564 | if (length < 0) | |
565 | goto out2; | |
566 | ||
567 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
568 | "%x %x %x %x %u", | |
569 | avd.allowed, avd.decided, | |
570 | avd.auditallow, avd.auditdeny, | |
571 | avd.seqno); | |
572 | out2: | |
573 | kfree(tcon); | |
574 | out: | |
575 | kfree(scon); | |
576 | return length; | |
577 | } | |
578 | ||
579 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size) | |
580 | { | |
581 | char *scon, *tcon; | |
582 | u32 ssid, tsid, newsid; | |
583 | u16 tclass; | |
584 | ssize_t length; | |
585 | char *newcon; | |
586 | u32 len; | |
587 | ||
588 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
589 | if (length) | |
590 | return length; | |
591 | ||
592 | length = -ENOMEM; | |
89d155ef | 593 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
594 | if (!scon) |
595 | return length; | |
1da177e4 | 596 | |
89d155ef | 597 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
598 | if (!tcon) |
599 | goto out; | |
1da177e4 LT |
600 | |
601 | length = -EINVAL; | |
602 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
603 | goto out2; | |
604 | ||
605 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
606 | if (length < 0) | |
607 | goto out2; | |
608 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
609 | if (length < 0) | |
610 | goto out2; | |
611 | ||
612 | length = security_transition_sid(ssid, tsid, tclass, &newsid); | |
613 | if (length < 0) | |
614 | goto out2; | |
615 | ||
616 | length = security_sid_to_context(newsid, &newcon, &len); | |
617 | if (length < 0) | |
618 | goto out2; | |
619 | ||
620 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
621 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
622 | "max\n", __FUNCTION__, len); | |
623 | length = -ERANGE; | |
624 | goto out3; | |
625 | } | |
626 | ||
627 | memcpy(buf, newcon, len); | |
628 | length = len; | |
629 | out3: | |
630 | kfree(newcon); | |
631 | out2: | |
632 | kfree(tcon); | |
633 | out: | |
634 | kfree(scon); | |
635 | return length; | |
636 | } | |
637 | ||
638 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size) | |
639 | { | |
640 | char *scon, *tcon; | |
641 | u32 ssid, tsid, newsid; | |
642 | u16 tclass; | |
643 | ssize_t length; | |
644 | char *newcon; | |
645 | u32 len; | |
646 | ||
647 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
648 | if (length) | |
649 | return length; | |
650 | ||
651 | length = -ENOMEM; | |
89d155ef | 652 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
653 | if (!scon) |
654 | return length; | |
1da177e4 | 655 | |
89d155ef | 656 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
657 | if (!tcon) |
658 | goto out; | |
1da177e4 LT |
659 | |
660 | length = -EINVAL; | |
661 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
662 | goto out2; | |
663 | ||
664 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
665 | if (length < 0) | |
666 | goto out2; | |
667 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
668 | if (length < 0) | |
669 | goto out2; | |
670 | ||
671 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
672 | if (length < 0) | |
673 | goto out2; | |
674 | ||
675 | length = security_sid_to_context(newsid, &newcon, &len); | |
676 | if (length < 0) | |
677 | goto out2; | |
678 | ||
679 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
680 | length = -ERANGE; | |
681 | goto out3; | |
682 | } | |
683 | ||
684 | memcpy(buf, newcon, len); | |
685 | length = len; | |
686 | out3: | |
687 | kfree(newcon); | |
688 | out2: | |
689 | kfree(tcon); | |
690 | out: | |
691 | kfree(scon); | |
692 | return length; | |
693 | } | |
694 | ||
695 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size) | |
696 | { | |
697 | char *con, *user, *ptr; | |
698 | u32 sid, *sids; | |
699 | ssize_t length; | |
700 | char *newcon; | |
701 | int i, rc; | |
702 | u32 len, nsids; | |
703 | ||
704 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
705 | if (length) | |
706 | return length; | |
707 | ||
708 | length = -ENOMEM; | |
89d155ef | 709 | con = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
710 | if (!con) |
711 | return length; | |
1da177e4 | 712 | |
89d155ef | 713 | user = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
714 | if (!user) |
715 | goto out; | |
1da177e4 LT |
716 | |
717 | length = -EINVAL; | |
718 | if (sscanf(buf, "%s %s", con, user) != 2) | |
719 | goto out2; | |
720 | ||
721 | length = security_context_to_sid(con, strlen(con)+1, &sid); | |
722 | if (length < 0) | |
723 | goto out2; | |
724 | ||
725 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
726 | if (length < 0) | |
727 | goto out2; | |
728 | ||
729 | length = sprintf(buf, "%u", nsids) + 1; | |
730 | ptr = buf + length; | |
731 | for (i = 0; i < nsids; i++) { | |
732 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
733 | if (rc) { | |
734 | length = rc; | |
735 | goto out3; | |
736 | } | |
737 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
738 | kfree(newcon); | |
739 | length = -ERANGE; | |
740 | goto out3; | |
741 | } | |
742 | memcpy(ptr, newcon, len); | |
743 | kfree(newcon); | |
744 | ptr += len; | |
745 | length += len; | |
746 | } | |
747 | out3: | |
748 | kfree(sids); | |
749 | out2: | |
750 | kfree(user); | |
751 | out: | |
752 | kfree(con); | |
753 | return length; | |
754 | } | |
755 | ||
756 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size) | |
757 | { | |
758 | char *scon, *tcon; | |
759 | u32 ssid, tsid, newsid; | |
760 | u16 tclass; | |
761 | ssize_t length; | |
762 | char *newcon; | |
763 | u32 len; | |
764 | ||
765 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
766 | if (length) | |
767 | return length; | |
768 | ||
769 | length = -ENOMEM; | |
89d155ef | 770 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
771 | if (!scon) |
772 | return length; | |
1da177e4 | 773 | |
89d155ef | 774 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
775 | if (!tcon) |
776 | goto out; | |
1da177e4 LT |
777 | |
778 | length = -EINVAL; | |
779 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
780 | goto out2; | |
781 | ||
782 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
783 | if (length < 0) | |
784 | goto out2; | |
785 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
786 | if (length < 0) | |
787 | goto out2; | |
788 | ||
789 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
790 | if (length < 0) | |
791 | goto out2; | |
792 | ||
793 | length = security_sid_to_context(newsid, &newcon, &len); | |
794 | if (length < 0) | |
795 | goto out2; | |
796 | ||
797 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
798 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
799 | "max\n", __FUNCTION__, len); | |
800 | length = -ERANGE; | |
801 | goto out3; | |
802 | } | |
803 | ||
804 | memcpy(buf, newcon, len); | |
805 | length = len; | |
806 | out3: | |
807 | kfree(newcon); | |
808 | out2: | |
809 | kfree(tcon); | |
810 | out: | |
811 | kfree(scon); | |
812 | return length; | |
813 | } | |
814 | ||
815 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
816 | { | |
817 | struct inode *ret = new_inode(sb); | |
818 | ||
819 | if (ret) { | |
820 | ret->i_mode = mode; | |
821 | ret->i_uid = ret->i_gid = 0; | |
1da177e4 LT |
822 | ret->i_blocks = 0; |
823 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; | |
824 | } | |
825 | return ret; | |
826 | } | |
827 | ||
1da177e4 LT |
828 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
829 | size_t count, loff_t *ppos) | |
830 | { | |
831 | char *page = NULL; | |
832 | ssize_t length; | |
1da177e4 LT |
833 | ssize_t ret; |
834 | int cur_enforcing; | |
835 | struct inode *inode; | |
836 | ||
bb003079 | 837 | mutex_lock(&sel_mutex); |
1da177e4 LT |
838 | |
839 | ret = -EFAULT; | |
840 | ||
bfd51626 | 841 | if (count > PAGE_SIZE) { |
1da177e4 LT |
842 | ret = -EINVAL; |
843 | goto out; | |
844 | } | |
845 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) { | |
846 | ret = -ENOMEM; | |
847 | goto out; | |
848 | } | |
849 | ||
3d5ff529 | 850 | inode = filep->f_path.dentry->d_inode; |
bce34bc0 | 851 | cur_enforcing = security_get_bool_value(inode->i_ino&SEL_INO_MASK); |
1da177e4 LT |
852 | if (cur_enforcing < 0) { |
853 | ret = cur_enforcing; | |
854 | goto out; | |
855 | } | |
856 | ||
857 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, | |
bce34bc0 | 858 | bool_pending_values[inode->i_ino&SEL_INO_MASK]); |
68bdcf28 | 859 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 860 | out: |
bb003079 | 861 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
862 | if (page) |
863 | free_page((unsigned long)page); | |
864 | return ret; | |
865 | } | |
866 | ||
867 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
868 | size_t count, loff_t *ppos) | |
869 | { | |
870 | char *page = NULL; | |
871 | ssize_t length = -EFAULT; | |
872 | int new_value; | |
873 | struct inode *inode; | |
874 | ||
bb003079 | 875 | mutex_lock(&sel_mutex); |
1da177e4 LT |
876 | |
877 | length = task_has_security(current, SECURITY__SETBOOL); | |
878 | if (length) | |
879 | goto out; | |
880 | ||
bfd51626 | 881 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
882 | length = -ENOMEM; |
883 | goto out; | |
884 | } | |
885 | if (*ppos != 0) { | |
886 | /* No partial writes. */ | |
887 | goto out; | |
888 | } | |
889 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
890 | if (!page) { | |
891 | length = -ENOMEM; | |
892 | goto out; | |
893 | } | |
894 | ||
895 | if (copy_from_user(page, buf, count)) | |
896 | goto out; | |
897 | ||
898 | length = -EINVAL; | |
899 | if (sscanf(page, "%d", &new_value) != 1) | |
900 | goto out; | |
901 | ||
902 | if (new_value) | |
903 | new_value = 1; | |
904 | ||
3d5ff529 | 905 | inode = filep->f_path.dentry->d_inode; |
bce34bc0 | 906 | bool_pending_values[inode->i_ino&SEL_INO_MASK] = new_value; |
1da177e4 LT |
907 | length = count; |
908 | ||
909 | out: | |
bb003079 | 910 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
911 | if (page) |
912 | free_page((unsigned long) page); | |
913 | return length; | |
914 | } | |
915 | ||
9c2e08c5 | 916 | static const struct file_operations sel_bool_ops = { |
1da177e4 LT |
917 | .read = sel_read_bool, |
918 | .write = sel_write_bool, | |
919 | }; | |
920 | ||
921 | static ssize_t sel_commit_bools_write(struct file *filep, | |
922 | const char __user *buf, | |
923 | size_t count, loff_t *ppos) | |
924 | { | |
925 | char *page = NULL; | |
926 | ssize_t length = -EFAULT; | |
927 | int new_value; | |
928 | ||
bb003079 | 929 | mutex_lock(&sel_mutex); |
1da177e4 LT |
930 | |
931 | length = task_has_security(current, SECURITY__SETBOOL); | |
932 | if (length) | |
933 | goto out; | |
934 | ||
bfd51626 | 935 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
936 | length = -ENOMEM; |
937 | goto out; | |
938 | } | |
939 | if (*ppos != 0) { | |
940 | /* No partial writes. */ | |
941 | goto out; | |
942 | } | |
943 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
944 | if (!page) { | |
945 | length = -ENOMEM; | |
946 | goto out; | |
947 | } | |
948 | ||
949 | if (copy_from_user(page, buf, count)) | |
950 | goto out; | |
951 | ||
952 | length = -EINVAL; | |
953 | if (sscanf(page, "%d", &new_value) != 1) | |
954 | goto out; | |
955 | ||
20c19e41 | 956 | if (new_value && bool_pending_values) { |
1da177e4 LT |
957 | security_set_bools(bool_num, bool_pending_values); |
958 | } | |
959 | ||
960 | length = count; | |
961 | ||
962 | out: | |
bb003079 | 963 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
964 | if (page) |
965 | free_page((unsigned long) page); | |
966 | return length; | |
967 | } | |
968 | ||
9c2e08c5 | 969 | static const struct file_operations sel_commit_bools_ops = { |
1da177e4 LT |
970 | .write = sel_commit_bools_write, |
971 | }; | |
972 | ||
0c92d7c7 | 973 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 974 | { |
0955dc03 | 975 | struct list_head *node; |
1da177e4 LT |
976 | |
977 | spin_lock(&dcache_lock); | |
978 | node = de->d_subdirs.next; | |
979 | while (node != &de->d_subdirs) { | |
5160ee6f | 980 | struct dentry *d = list_entry(node, struct dentry, d_u.d_child); |
1da177e4 LT |
981 | list_del_init(node); |
982 | ||
983 | if (d->d_inode) { | |
984 | d = dget_locked(d); | |
985 | spin_unlock(&dcache_lock); | |
986 | d_delete(d); | |
987 | simple_unlink(de->d_inode, d); | |
988 | dput(d); | |
989 | spin_lock(&dcache_lock); | |
990 | } | |
991 | node = de->d_subdirs.next; | |
992 | } | |
993 | ||
994 | spin_unlock(&dcache_lock); | |
1da177e4 LT |
995 | } |
996 | ||
997 | #define BOOL_DIR_NAME "booleans" | |
998 | ||
999 | static int sel_make_bools(void) | |
1000 | { | |
1001 | int i, ret = 0; | |
1002 | ssize_t len; | |
1003 | struct dentry *dentry = NULL; | |
1004 | struct dentry *dir = bool_dir; | |
1005 | struct inode *inode = NULL; | |
1006 | struct inode_security_struct *isec; | |
1007 | char **names = NULL, *page; | |
1008 | int num; | |
1009 | int *values = NULL; | |
1010 | u32 sid; | |
1011 | ||
1012 | /* remove any existing files */ | |
9a5f04bf | 1013 | kfree(bool_pending_values); |
20c19e41 | 1014 | bool_pending_values = NULL; |
1da177e4 | 1015 | |
0c92d7c7 | 1016 | sel_remove_entries(dir); |
1da177e4 LT |
1017 | |
1018 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) | |
1019 | return -ENOMEM; | |
1020 | ||
1021 | ret = security_get_bools(&num, &names, &values); | |
1022 | if (ret != 0) | |
1023 | goto out; | |
1024 | ||
1025 | for (i = 0; i < num; i++) { | |
1026 | dentry = d_alloc_name(dir, names[i]); | |
1027 | if (!dentry) { | |
1028 | ret = -ENOMEM; | |
1029 | goto err; | |
1030 | } | |
1031 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); | |
1032 | if (!inode) { | |
1033 | ret = -ENOMEM; | |
1034 | goto err; | |
1035 | } | |
1036 | ||
1037 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); | |
1038 | if (len < 0) { | |
1039 | ret = -EINVAL; | |
1040 | goto err; | |
1041 | } else if (len >= PAGE_SIZE) { | |
1042 | ret = -ENAMETOOLONG; | |
1043 | goto err; | |
1044 | } | |
1045 | isec = (struct inode_security_struct*)inode->i_security; | |
1046 | if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid))) | |
1047 | goto err; | |
1048 | isec->sid = sid; | |
1049 | isec->initialized = 1; | |
1050 | inode->i_fop = &sel_bool_ops; | |
bce34bc0 | 1051 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1052 | d_add(dentry, inode); |
1053 | } | |
1054 | bool_num = num; | |
1055 | bool_pending_values = values; | |
1056 | out: | |
1057 | free_page((unsigned long)page); | |
1058 | if (names) { | |
9a5f04bf JJ |
1059 | for (i = 0; i < num; i++) |
1060 | kfree(names[i]); | |
1da177e4 LT |
1061 | kfree(names); |
1062 | } | |
1063 | return ret; | |
1064 | err: | |
20c19e41 | 1065 | kfree(values); |
0c92d7c7 | 1066 | sel_remove_entries(dir); |
1da177e4 LT |
1067 | ret = -ENOMEM; |
1068 | goto out; | |
1069 | } | |
1070 | ||
1071 | #define NULL_FILE_NAME "null" | |
1072 | ||
1073 | struct dentry *selinux_null = NULL; | |
1074 | ||
1075 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1076 | size_t count, loff_t *ppos) | |
1077 | { | |
1078 | char tmpbuf[TMPBUFLEN]; | |
1079 | ssize_t length; | |
1080 | ||
1081 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1082 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1083 | } | |
1084 | ||
1085 | static ssize_t sel_write_avc_cache_threshold(struct file * file, | |
1086 | const char __user * buf, | |
1087 | size_t count, loff_t *ppos) | |
1088 | ||
1089 | { | |
1090 | char *page; | |
1091 | ssize_t ret; | |
1092 | int new_value; | |
1093 | ||
bfd51626 | 1094 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
1095 | ret = -ENOMEM; |
1096 | goto out; | |
1097 | } | |
1098 | ||
1099 | if (*ppos != 0) { | |
1100 | /* No partial writes. */ | |
1101 | ret = -EINVAL; | |
1102 | goto out; | |
1103 | } | |
1104 | ||
1105 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
1106 | if (!page) { | |
1107 | ret = -ENOMEM; | |
1108 | goto out; | |
1109 | } | |
1110 | ||
1111 | if (copy_from_user(page, buf, count)) { | |
1112 | ret = -EFAULT; | |
1113 | goto out_free; | |
1114 | } | |
1115 | ||
1116 | if (sscanf(page, "%u", &new_value) != 1) { | |
1117 | ret = -EINVAL; | |
1118 | goto out; | |
1119 | } | |
1120 | ||
1121 | if (new_value != avc_cache_threshold) { | |
1122 | ret = task_has_security(current, SECURITY__SETSECPARAM); | |
1123 | if (ret) | |
1124 | goto out_free; | |
1125 | avc_cache_threshold = new_value; | |
1126 | } | |
1127 | ret = count; | |
1128 | out_free: | |
1129 | free_page((unsigned long)page); | |
1130 | out: | |
1131 | return ret; | |
1132 | } | |
1133 | ||
1134 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1135 | size_t count, loff_t *ppos) | |
1136 | { | |
1137 | char *page; | |
1138 | ssize_t ret = 0; | |
1139 | ||
1140 | page = (char *)__get_free_page(GFP_KERNEL); | |
1141 | if (!page) { | |
1142 | ret = -ENOMEM; | |
1143 | goto out; | |
1144 | } | |
1145 | ret = avc_get_hash_stats(page); | |
1146 | if (ret >= 0) | |
1147 | ret = simple_read_from_buffer(buf, count, ppos, page, ret); | |
1148 | free_page((unsigned long)page); | |
1149 | out: | |
1150 | return ret; | |
1151 | } | |
1152 | ||
9c2e08c5 | 1153 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1154 | .read = sel_read_avc_cache_threshold, |
1155 | .write = sel_write_avc_cache_threshold, | |
1156 | }; | |
1157 | ||
9c2e08c5 | 1158 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 LT |
1159 | .read = sel_read_avc_hash_stats, |
1160 | }; | |
1161 | ||
1162 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1163 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1164 | { | |
1165 | int cpu; | |
1166 | ||
1167 | for (cpu = *idx; cpu < NR_CPUS; ++cpu) { | |
1168 | if (!cpu_possible(cpu)) | |
1169 | continue; | |
1170 | *idx = cpu + 1; | |
1171 | return &per_cpu(avc_cache_stats, cpu); | |
1172 | } | |
1173 | return NULL; | |
1174 | } | |
1175 | ||
1176 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1177 | { | |
1178 | loff_t n = *pos - 1; | |
1179 | ||
1180 | if (*pos == 0) | |
1181 | return SEQ_START_TOKEN; | |
1182 | ||
1183 | return sel_avc_get_stat_idx(&n); | |
1184 | } | |
1185 | ||
1186 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1187 | { | |
1188 | return sel_avc_get_stat_idx(pos); | |
1189 | } | |
1190 | ||
1191 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1192 | { | |
1193 | struct avc_cache_stats *st = v; | |
1194 | ||
1195 | if (v == SEQ_START_TOKEN) | |
1196 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1197 | "frees\n"); | |
1198 | else | |
1199 | seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, | |
1200 | st->hits, st->misses, st->allocations, | |
1201 | st->reclaims, st->frees); | |
1202 | return 0; | |
1203 | } | |
1204 | ||
1205 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1206 | { } | |
1207 | ||
1208 | static struct seq_operations sel_avc_cache_stats_seq_ops = { | |
1209 | .start = sel_avc_stats_seq_start, | |
1210 | .next = sel_avc_stats_seq_next, | |
1211 | .show = sel_avc_stats_seq_show, | |
1212 | .stop = sel_avc_stats_seq_stop, | |
1213 | }; | |
1214 | ||
1215 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1216 | { | |
1217 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1218 | } | |
1219 | ||
9c2e08c5 | 1220 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1221 | .open = sel_open_avc_cache_stats, |
1222 | .read = seq_read, | |
1223 | .llseek = seq_lseek, | |
1224 | .release = seq_release, | |
1225 | }; | |
1226 | #endif | |
1227 | ||
1228 | static int sel_make_avc_files(struct dentry *dir) | |
1229 | { | |
1230 | int i, ret = 0; | |
1231 | static struct tree_descr files[] = { | |
1232 | { "cache_threshold", | |
1233 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1234 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1235 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1236 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1237 | #endif | |
1238 | }; | |
1239 | ||
6e20a64a | 1240 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1241 | struct inode *inode; |
1242 | struct dentry *dentry; | |
1243 | ||
1244 | dentry = d_alloc_name(dir, files[i].name); | |
1245 | if (!dentry) { | |
1246 | ret = -ENOMEM; | |
d6aafa65 | 1247 | goto out; |
1da177e4 LT |
1248 | } |
1249 | ||
1250 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
1251 | if (!inode) { | |
1252 | ret = -ENOMEM; | |
d6aafa65 | 1253 | goto out; |
1da177e4 LT |
1254 | } |
1255 | inode->i_fop = files[i].ops; | |
6174eafc | 1256 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1257 | d_add(dentry, inode); |
1258 | } | |
1259 | out: | |
1260 | return ret; | |
1da177e4 LT |
1261 | } |
1262 | ||
f0ee2e46 JC |
1263 | static ssize_t sel_read_initcon(struct file * file, char __user *buf, |
1264 | size_t count, loff_t *ppos) | |
1265 | { | |
1266 | struct inode *inode; | |
1267 | char *con; | |
1268 | u32 sid, len; | |
1269 | ssize_t ret; | |
1270 | ||
1271 | inode = file->f_path.dentry->d_inode; | |
1272 | sid = inode->i_ino&SEL_INO_MASK; | |
1273 | ret = security_sid_to_context(sid, &con, &len); | |
1274 | if (ret < 0) | |
1275 | return ret; | |
1276 | ||
1277 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1278 | kfree(con); | |
1279 | return ret; | |
1280 | } | |
1281 | ||
1282 | static const struct file_operations sel_initcon_ops = { | |
1283 | .read = sel_read_initcon, | |
1284 | }; | |
1285 | ||
1286 | static int sel_make_initcon_files(struct dentry *dir) | |
1287 | { | |
1288 | int i, ret = 0; | |
1289 | ||
1290 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1291 | struct inode *inode; | |
1292 | struct dentry *dentry; | |
1293 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
1294 | if (!dentry) { | |
1295 | ret = -ENOMEM; | |
1296 | goto out; | |
1297 | } | |
1298 | ||
1299 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
1300 | if (!inode) { | |
1301 | ret = -ENOMEM; | |
1302 | goto out; | |
1303 | } | |
1304 | inode->i_fop = &sel_initcon_ops; | |
1305 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1306 | d_add(dentry, inode); | |
1307 | } | |
1308 | out: | |
1309 | return ret; | |
1310 | } | |
1311 | ||
e47c8fc5 CP |
1312 | static inline unsigned int sel_div(unsigned long a, unsigned long b) |
1313 | { | |
1314 | return a / b - (a % b < 0); | |
1315 | } | |
1316 | ||
1317 | static inline unsigned long sel_class_to_ino(u16 class) | |
1318 | { | |
1319 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1320 | } | |
1321 | ||
1322 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1323 | { | |
1324 | return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1); | |
1325 | } | |
1326 | ||
1327 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1328 | { | |
1329 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1330 | } | |
1331 | ||
1332 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1333 | { | |
1334 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1335 | } | |
1336 | ||
1337 | static ssize_t sel_read_class(struct file * file, char __user *buf, | |
1338 | size_t count, loff_t *ppos) | |
1339 | { | |
1340 | ssize_t rc, len; | |
1341 | char *page; | |
1342 | unsigned long ino = file->f_path.dentry->d_inode->i_ino; | |
1343 | ||
1344 | page = (char *)__get_free_page(GFP_KERNEL); | |
1345 | if (!page) { | |
1346 | rc = -ENOMEM; | |
1347 | goto out; | |
1348 | } | |
1349 | ||
1350 | len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino)); | |
1351 | rc = simple_read_from_buffer(buf, count, ppos, page, len); | |
1352 | free_page((unsigned long)page); | |
1353 | out: | |
1354 | return rc; | |
1355 | } | |
1356 | ||
1357 | static const struct file_operations sel_class_ops = { | |
1358 | .read = sel_read_class, | |
1359 | }; | |
1360 | ||
1361 | static ssize_t sel_read_perm(struct file * file, char __user *buf, | |
1362 | size_t count, loff_t *ppos) | |
1363 | { | |
1364 | ssize_t rc, len; | |
1365 | char *page; | |
1366 | unsigned long ino = file->f_path.dentry->d_inode->i_ino; | |
1367 | ||
1368 | page = (char *)__get_free_page(GFP_KERNEL); | |
1369 | if (!page) { | |
1370 | rc = -ENOMEM; | |
1371 | goto out; | |
1372 | } | |
1373 | ||
1374 | len = snprintf(page, PAGE_SIZE,"%d", sel_ino_to_perm(ino)); | |
1375 | rc = simple_read_from_buffer(buf, count, ppos, page, len); | |
1376 | free_page((unsigned long)page); | |
1377 | out: | |
1378 | return rc; | |
1379 | } | |
1380 | ||
1381 | static const struct file_operations sel_perm_ops = { | |
1382 | .read = sel_read_perm, | |
1383 | }; | |
1384 | ||
1385 | static int sel_make_perm_files(char *objclass, int classvalue, | |
1386 | struct dentry *dir) | |
1387 | { | |
1388 | int i, rc = 0, nperms; | |
1389 | char **perms; | |
1390 | ||
1391 | rc = security_get_permissions(objclass, &perms, &nperms); | |
1392 | if (rc) | |
1393 | goto out; | |
1394 | ||
1395 | for (i = 0; i < nperms; i++) { | |
1396 | struct inode *inode; | |
1397 | struct dentry *dentry; | |
1398 | ||
1399 | dentry = d_alloc_name(dir, perms[i]); | |
1400 | if (!dentry) { | |
1401 | rc = -ENOMEM; | |
1402 | goto out1; | |
1403 | } | |
1404 | ||
1405 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
1406 | if (!inode) { | |
1407 | rc = -ENOMEM; | |
1408 | goto out1; | |
1409 | } | |
1410 | inode->i_fop = &sel_perm_ops; | |
1411 | /* i+1 since perm values are 1-indexed */ | |
1412 | inode->i_ino = sel_perm_to_ino(classvalue, i+1); | |
1413 | d_add(dentry, inode); | |
1414 | } | |
1415 | ||
1416 | out1: | |
1417 | for (i = 0; i < nperms; i++) | |
1418 | kfree(perms[i]); | |
1419 | kfree(perms); | |
1420 | out: | |
1421 | return rc; | |
1422 | } | |
1423 | ||
1424 | static int sel_make_class_dir_entries(char *classname, int index, | |
1425 | struct dentry *dir) | |
1426 | { | |
1427 | struct dentry *dentry = NULL; | |
1428 | struct inode *inode = NULL; | |
1429 | int rc; | |
1430 | ||
1431 | dentry = d_alloc_name(dir, "index"); | |
1432 | if (!dentry) { | |
1433 | rc = -ENOMEM; | |
1434 | goto out; | |
1435 | } | |
1436 | ||
1437 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
1438 | if (!inode) { | |
1439 | rc = -ENOMEM; | |
1440 | goto out; | |
1441 | } | |
1442 | ||
1443 | inode->i_fop = &sel_class_ops; | |
1444 | inode->i_ino = sel_class_to_ino(index); | |
1445 | d_add(dentry, inode); | |
1446 | ||
1447 | dentry = d_alloc_name(dir, "perms"); | |
1448 | if (!dentry) { | |
1449 | rc = -ENOMEM; | |
1450 | goto out; | |
1451 | } | |
1452 | ||
1453 | rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino); | |
1454 | if (rc) | |
1455 | goto out; | |
1456 | ||
1457 | rc = sel_make_perm_files(classname, index, dentry); | |
1458 | ||
1459 | out: | |
1460 | return rc; | |
1461 | } | |
1462 | ||
1463 | static void sel_remove_classes(void) | |
1464 | { | |
1465 | struct list_head *class_node; | |
1466 | ||
1467 | list_for_each(class_node, &class_dir->d_subdirs) { | |
1468 | struct dentry *class_subdir = list_entry(class_node, | |
1469 | struct dentry, d_u.d_child); | |
1470 | struct list_head *class_subdir_node; | |
1471 | ||
1472 | list_for_each(class_subdir_node, &class_subdir->d_subdirs) { | |
1473 | struct dentry *d = list_entry(class_subdir_node, | |
1474 | struct dentry, d_u.d_child); | |
1475 | ||
1476 | if (d->d_inode) | |
1477 | if (d->d_inode->i_mode & S_IFDIR) | |
1478 | sel_remove_entries(d); | |
1479 | } | |
1480 | ||
1481 | sel_remove_entries(class_subdir); | |
1482 | } | |
1483 | ||
1484 | sel_remove_entries(class_dir); | |
1485 | } | |
1486 | ||
1487 | static int sel_make_classes(void) | |
1488 | { | |
1489 | int rc = 0, nclasses, i; | |
1490 | char **classes; | |
1491 | ||
1492 | /* delete any existing entries */ | |
1493 | sel_remove_classes(); | |
1494 | ||
1495 | rc = security_get_classes(&classes, &nclasses); | |
1496 | if (rc < 0) | |
1497 | goto out; | |
1498 | ||
1499 | /* +2 since classes are 1-indexed */ | |
1500 | last_class_ino = sel_class_to_ino(nclasses+2); | |
1501 | ||
1502 | for (i = 0; i < nclasses; i++) { | |
1503 | struct dentry *class_name_dir; | |
1504 | ||
1505 | class_name_dir = d_alloc_name(class_dir, classes[i]); | |
1506 | if (!class_name_dir) { | |
1507 | rc = -ENOMEM; | |
1508 | goto out1; | |
1509 | } | |
1510 | ||
1511 | rc = sel_make_dir(class_dir->d_inode, class_name_dir, | |
1512 | &last_class_ino); | |
1513 | if (rc) | |
1514 | goto out1; | |
1515 | ||
1516 | /* i+1 since class values are 1-indexed */ | |
1517 | rc = sel_make_class_dir_entries(classes[i], i+1, | |
1518 | class_name_dir); | |
1519 | if (rc) | |
1520 | goto out1; | |
1521 | } | |
1522 | ||
1523 | out1: | |
1524 | for (i = 0; i < nclasses; i++) | |
1525 | kfree(classes[i]); | |
1526 | kfree(classes); | |
1527 | out: | |
1528 | return rc; | |
1529 | } | |
1530 | ||
0dd4ae51 CP |
1531 | static int sel_make_dir(struct inode *dir, struct dentry *dentry, |
1532 | unsigned long *ino) | |
1da177e4 LT |
1533 | { |
1534 | int ret = 0; | |
1535 | struct inode *inode; | |
1536 | ||
edb20fb5 | 1537 | inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); |
1da177e4 LT |
1538 | if (!inode) { |
1539 | ret = -ENOMEM; | |
1540 | goto out; | |
1541 | } | |
1542 | inode->i_op = &simple_dir_inode_operations; | |
1543 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1544 | inode->i_ino = ++(*ino); |
40e906f8 | 1545 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1546 | inc_nlink(inode); |
1da177e4 | 1547 | d_add(dentry, inode); |
edb20fb5 | 1548 | /* bump link count on parent directory, too */ |
d8c76e6f | 1549 | inc_nlink(dir); |
1da177e4 LT |
1550 | out: |
1551 | return ret; | |
1552 | } | |
1553 | ||
1554 | static int sel_fill_super(struct super_block * sb, void * data, int silent) | |
1555 | { | |
1556 | int ret; | |
1557 | struct dentry *dentry; | |
edb20fb5 | 1558 | struct inode *inode, *root_inode; |
1da177e4 LT |
1559 | struct inode_security_struct *isec; |
1560 | ||
1561 | static struct tree_descr selinux_files[] = { | |
1562 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1563 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1564 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1565 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1566 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1567 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1568 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1569 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1570 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1571 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1572 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1573 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1574 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
4e5ab4cb | 1575 | [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR}, |
3f12070e EP |
1576 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1577 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
1da177e4 LT |
1578 | /* last one */ {""} |
1579 | }; | |
1580 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1581 | if (ret) | |
161ce45a | 1582 | goto err; |
1da177e4 | 1583 | |
edb20fb5 JM |
1584 | root_inode = sb->s_root->d_inode; |
1585 | ||
1da177e4 | 1586 | dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); |
161ce45a JM |
1587 | if (!dentry) { |
1588 | ret = -ENOMEM; | |
1589 | goto err; | |
1590 | } | |
1da177e4 | 1591 | |
0dd4ae51 | 1592 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
cde174a8 | 1593 | if (ret) |
161ce45a | 1594 | goto err; |
cde174a8 | 1595 | |
1da177e4 | 1596 | bool_dir = dentry; |
1da177e4 LT |
1597 | |
1598 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); | |
161ce45a JM |
1599 | if (!dentry) { |
1600 | ret = -ENOMEM; | |
1601 | goto err; | |
1602 | } | |
1da177e4 LT |
1603 | |
1604 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); | |
161ce45a JM |
1605 | if (!inode) { |
1606 | ret = -ENOMEM; | |
1607 | goto err; | |
1608 | } | |
6174eafc | 1609 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1610 | isec = (struct inode_security_struct*)inode->i_security; |
1611 | isec->sid = SECINITSID_DEVNULL; | |
1612 | isec->sclass = SECCLASS_CHR_FILE; | |
1613 | isec->initialized = 1; | |
1614 | ||
1615 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1616 | d_add(dentry, inode); | |
1617 | selinux_null = dentry; | |
1618 | ||
1619 | dentry = d_alloc_name(sb->s_root, "avc"); | |
161ce45a JM |
1620 | if (!dentry) { |
1621 | ret = -ENOMEM; | |
1622 | goto err; | |
1623 | } | |
1da177e4 | 1624 | |
0dd4ae51 | 1625 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
1da177e4 | 1626 | if (ret) |
161ce45a | 1627 | goto err; |
1da177e4 LT |
1628 | |
1629 | ret = sel_make_avc_files(dentry); | |
1630 | if (ret) | |
161ce45a | 1631 | goto err; |
f0ee2e46 JC |
1632 | |
1633 | dentry = d_alloc_name(sb->s_root, "initial_contexts"); | |
1634 | if (!dentry) { | |
1635 | ret = -ENOMEM; | |
1636 | goto err; | |
1637 | } | |
1638 | ||
0dd4ae51 | 1639 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
f0ee2e46 JC |
1640 | if (ret) |
1641 | goto err; | |
1642 | ||
1643 | ret = sel_make_initcon_files(dentry); | |
1644 | if (ret) | |
1645 | goto err; | |
1646 | ||
e47c8fc5 CP |
1647 | dentry = d_alloc_name(sb->s_root, "class"); |
1648 | if (!dentry) { | |
1649 | ret = -ENOMEM; | |
1650 | goto err; | |
1651 | } | |
1652 | ||
1653 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); | |
1654 | if (ret) | |
1655 | goto err; | |
1656 | ||
1657 | class_dir = dentry; | |
1658 | ||
1da177e4 | 1659 | out: |
161ce45a JM |
1660 | return ret; |
1661 | err: | |
1da177e4 | 1662 | printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__); |
161ce45a | 1663 | goto out; |
1da177e4 LT |
1664 | } |
1665 | ||
454e2398 DH |
1666 | static int sel_get_sb(struct file_system_type *fs_type, |
1667 | int flags, const char *dev_name, void *data, | |
1668 | struct vfsmount *mnt) | |
1da177e4 | 1669 | { |
454e2398 | 1670 | return get_sb_single(fs_type, flags, data, sel_fill_super, mnt); |
1da177e4 LT |
1671 | } |
1672 | ||
1673 | static struct file_system_type sel_fs_type = { | |
1674 | .name = "selinuxfs", | |
1675 | .get_sb = sel_get_sb, | |
1676 | .kill_sb = kill_litter_super, | |
1677 | }; | |
1678 | ||
1679 | struct vfsmount *selinuxfs_mount; | |
1680 | ||
1681 | static int __init init_sel_fs(void) | |
1682 | { | |
1683 | int err; | |
1684 | ||
1685 | if (!selinux_enabled) | |
1686 | return 0; | |
1687 | err = register_filesystem(&sel_fs_type); | |
1688 | if (!err) { | |
1689 | selinuxfs_mount = kern_mount(&sel_fs_type); | |
1690 | if (IS_ERR(selinuxfs_mount)) { | |
1691 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1692 | err = PTR_ERR(selinuxfs_mount); | |
1693 | selinuxfs_mount = NULL; | |
1694 | } | |
1695 | } | |
1696 | return err; | |
1697 | } | |
1698 | ||
1699 | __initcall(init_sel_fs); | |
1700 | ||
1701 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1702 | void exit_sel_fs(void) | |
1703 | { | |
1704 | unregister_filesystem(&sel_fs_type); | |
1705 | } | |
1706 | #endif |