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1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
2 *
3 * Added conditional policy language extensions
4 *
5 * Updated: Hewlett-Packard <paul@paul-moore.com>
6 *
7 * Added support for the policy capability bitmap
8 *
9 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
10 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
11 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation, version 2.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/pagemap.h>
19 #include <linux/slab.h>
20 #include <linux/vmalloc.h>
21 #include <linux/fs.h>
22 #include <linux/mutex.h>
23 #include <linux/init.h>
24 #include <linux/string.h>
25 #include <linux/security.h>
26 #include <linux/major.h>
27 #include <linux/seq_file.h>
28 #include <linux/percpu.h>
29 #include <linux/audit.h>
30 #include <linux/uaccess.h>
31 #include <linux/kobject.h>
32 #include <linux/ctype.h>
33
34 /* selinuxfs pseudo filesystem for exporting the security policy API.
35 Based on the proc code and the fs/nfsd/nfsctl.c code. */
36
37 #include "flask.h"
38 #include "avc.h"
39 #include "avc_ss.h"
40 #include "security.h"
41 #include "objsec.h"
42 #include "conditional.h"
43
44 /* Policy capability filenames */
45 static char *policycap_names[] = {
46 "network_peer_controls",
47 "open_perms",
48 "redhat1",
49 "always_check_network"
50 };
51
52 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
53
54 static int __init checkreqprot_setup(char *str)
55 {
56 unsigned long checkreqprot;
57 if (!kstrtoul(str, 0, &checkreqprot))
58 selinux_checkreqprot = checkreqprot ? 1 : 0;
59 return 1;
60 }
61 __setup("checkreqprot=", checkreqprot_setup);
62
63 static DEFINE_MUTEX(sel_mutex);
64
65 /* global data for booleans */
66 static struct dentry *bool_dir;
67 static int bool_num;
68 static char **bool_pending_names;
69 static int *bool_pending_values;
70
71 /* global data for classes */
72 static struct dentry *class_dir;
73 static unsigned long last_class_ino;
74
75 static char policy_opened;
76
77 /* global data for policy capabilities */
78 static struct dentry *policycap_dir;
79
80 /* Check whether a task is allowed to use a security operation. */
81 static int task_has_security(struct task_struct *tsk,
82 u32 perms)
83 {
84 const struct task_security_struct *tsec;
85 u32 sid = 0;
86
87 rcu_read_lock();
88 tsec = __task_cred(tsk)->security;
89 if (tsec)
90 sid = tsec->sid;
91 rcu_read_unlock();
92 if (!tsec)
93 return -EACCES;
94
95 return avc_has_perm(sid, SECINITSID_SECURITY,
96 SECCLASS_SECURITY, perms, NULL);
97 }
98
99 enum sel_inos {
100 SEL_ROOT_INO = 2,
101 SEL_LOAD, /* load policy */
102 SEL_ENFORCE, /* get or set enforcing status */
103 SEL_CONTEXT, /* validate context */
104 SEL_ACCESS, /* compute access decision */
105 SEL_CREATE, /* compute create labeling decision */
106 SEL_RELABEL, /* compute relabeling decision */
107 SEL_USER, /* compute reachable user contexts */
108 SEL_POLICYVERS, /* return policy version for this kernel */
109 SEL_COMMIT_BOOLS, /* commit new boolean values */
110 SEL_MLS, /* return if MLS policy is enabled */
111 SEL_DISABLE, /* disable SELinux until next reboot */
112 SEL_MEMBER, /* compute polyinstantiation membership decision */
113 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
114 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
115 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
116 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
117 SEL_STATUS, /* export current status using mmap() */
118 SEL_POLICY, /* allow userspace to read the in kernel policy */
119 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
120 SEL_INO_NEXT, /* The next inode number to use */
121 };
122
123 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
124
125 #define SEL_INITCON_INO_OFFSET 0x01000000
126 #define SEL_BOOL_INO_OFFSET 0x02000000
127 #define SEL_CLASS_INO_OFFSET 0x04000000
128 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
129 #define SEL_INO_MASK 0x00ffffff
130
131 #define TMPBUFLEN 12
132 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
133 size_t count, loff_t *ppos)
134 {
135 char tmpbuf[TMPBUFLEN];
136 ssize_t length;
137
138 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
139 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
140 }
141
142 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
143 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
144 size_t count, loff_t *ppos)
145
146 {
147 char *page = NULL;
148 ssize_t length;
149 int new_value;
150
151 if (count >= PAGE_SIZE)
152 return -ENOMEM;
153
154 /* No partial writes. */
155 if (*ppos != 0)
156 return -EINVAL;
157
158 page = memdup_user_nul(buf, count);
159 if (IS_ERR(page))
160 return PTR_ERR(page);
161
162 length = -EINVAL;
163 if (sscanf(page, "%d", &new_value) != 1)
164 goto out;
165
166 new_value = !!new_value;
167
168 if (new_value != selinux_enforcing) {
169 length = task_has_security(current, SECURITY__SETENFORCE);
170 if (length)
171 goto out;
172 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
173 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
174 new_value, selinux_enforcing,
175 from_kuid(&init_user_ns, audit_get_loginuid(current)),
176 audit_get_sessionid(current));
177 selinux_enforcing = new_value;
178 if (selinux_enforcing)
179 avc_ss_reset(0);
180 selnl_notify_setenforce(selinux_enforcing);
181 selinux_status_update_setenforce(selinux_enforcing);
182 }
183 length = count;
184 out:
185 kfree(page);
186 return length;
187 }
188 #else
189 #define sel_write_enforce NULL
190 #endif
191
192 static const struct file_operations sel_enforce_ops = {
193 .read = sel_read_enforce,
194 .write = sel_write_enforce,
195 .llseek = generic_file_llseek,
196 };
197
198 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
199 size_t count, loff_t *ppos)
200 {
201 char tmpbuf[TMPBUFLEN];
202 ssize_t length;
203 ino_t ino = file_inode(filp)->i_ino;
204 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
205 security_get_reject_unknown() : !security_get_allow_unknown();
206
207 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
208 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
209 }
210
211 static const struct file_operations sel_handle_unknown_ops = {
212 .read = sel_read_handle_unknown,
213 .llseek = generic_file_llseek,
214 };
215
216 static int sel_open_handle_status(struct inode *inode, struct file *filp)
217 {
218 struct page *status = selinux_kernel_status_page();
219
220 if (!status)
221 return -ENOMEM;
222
223 filp->private_data = status;
224
225 return 0;
226 }
227
228 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
229 size_t count, loff_t *ppos)
230 {
231 struct page *status = filp->private_data;
232
233 BUG_ON(!status);
234
235 return simple_read_from_buffer(buf, count, ppos,
236 page_address(status),
237 sizeof(struct selinux_kernel_status));
238 }
239
240 static int sel_mmap_handle_status(struct file *filp,
241 struct vm_area_struct *vma)
242 {
243 struct page *status = filp->private_data;
244 unsigned long size = vma->vm_end - vma->vm_start;
245
246 BUG_ON(!status);
247
248 /* only allows one page from the head */
249 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
250 return -EIO;
251 /* disallow writable mapping */
252 if (vma->vm_flags & VM_WRITE)
253 return -EPERM;
254 /* disallow mprotect() turns it into writable */
255 vma->vm_flags &= ~VM_MAYWRITE;
256
257 return remap_pfn_range(vma, vma->vm_start,
258 page_to_pfn(status),
259 size, vma->vm_page_prot);
260 }
261
262 static const struct file_operations sel_handle_status_ops = {
263 .open = sel_open_handle_status,
264 .read = sel_read_handle_status,
265 .mmap = sel_mmap_handle_status,
266 .llseek = generic_file_llseek,
267 };
268
269 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
270 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
271 size_t count, loff_t *ppos)
272
273 {
274 char *page;
275 ssize_t length;
276 int new_value;
277
278 if (count >= PAGE_SIZE)
279 return -ENOMEM;
280
281 /* No partial writes. */
282 if (*ppos != 0)
283 return -EINVAL;
284
285 page = memdup_user_nul(buf, count);
286 if (IS_ERR(page))
287 return PTR_ERR(page);
288
289 length = -EINVAL;
290 if (sscanf(page, "%d", &new_value) != 1)
291 goto out;
292
293 if (new_value) {
294 length = selinux_disable();
295 if (length)
296 goto out;
297 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
298 "selinux=0 auid=%u ses=%u",
299 from_kuid(&init_user_ns, audit_get_loginuid(current)),
300 audit_get_sessionid(current));
301 }
302
303 length = count;
304 out:
305 kfree(page);
306 return length;
307 }
308 #else
309 #define sel_write_disable NULL
310 #endif
311
312 static const struct file_operations sel_disable_ops = {
313 .write = sel_write_disable,
314 .llseek = generic_file_llseek,
315 };
316
317 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
318 size_t count, loff_t *ppos)
319 {
320 char tmpbuf[TMPBUFLEN];
321 ssize_t length;
322
323 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
324 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
325 }
326
327 static const struct file_operations sel_policyvers_ops = {
328 .read = sel_read_policyvers,
329 .llseek = generic_file_llseek,
330 };
331
332 /* declaration for sel_write_load */
333 static int sel_make_bools(void);
334 static int sel_make_classes(void);
335 static int sel_make_policycap(void);
336
337 /* declaration for sel_make_class_dirs */
338 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
339 unsigned long *ino);
340
341 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
342 size_t count, loff_t *ppos)
343 {
344 char tmpbuf[TMPBUFLEN];
345 ssize_t length;
346
347 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
348 security_mls_enabled());
349 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
350 }
351
352 static const struct file_operations sel_mls_ops = {
353 .read = sel_read_mls,
354 .llseek = generic_file_llseek,
355 };
356
357 struct policy_load_memory {
358 size_t len;
359 void *data;
360 };
361
362 static int sel_open_policy(struct inode *inode, struct file *filp)
363 {
364 struct policy_load_memory *plm = NULL;
365 int rc;
366
367 BUG_ON(filp->private_data);
368
369 mutex_lock(&sel_mutex);
370
371 rc = task_has_security(current, SECURITY__READ_POLICY);
372 if (rc)
373 goto err;
374
375 rc = -EBUSY;
376 if (policy_opened)
377 goto err;
378
379 rc = -ENOMEM;
380 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
381 if (!plm)
382 goto err;
383
384 if (i_size_read(inode) != security_policydb_len()) {
385 inode_lock(inode);
386 i_size_write(inode, security_policydb_len());
387 inode_unlock(inode);
388 }
389
390 rc = security_read_policy(&plm->data, &plm->len);
391 if (rc)
392 goto err;
393
394 policy_opened = 1;
395
396 filp->private_data = plm;
397
398 mutex_unlock(&sel_mutex);
399
400 return 0;
401 err:
402 mutex_unlock(&sel_mutex);
403
404 if (plm)
405 vfree(plm->data);
406 kfree(plm);
407 return rc;
408 }
409
410 static int sel_release_policy(struct inode *inode, struct file *filp)
411 {
412 struct policy_load_memory *plm = filp->private_data;
413
414 BUG_ON(!plm);
415
416 policy_opened = 0;
417
418 vfree(plm->data);
419 kfree(plm);
420
421 return 0;
422 }
423
424 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
425 size_t count, loff_t *ppos)
426 {
427 struct policy_load_memory *plm = filp->private_data;
428 int ret;
429
430 mutex_lock(&sel_mutex);
431
432 ret = task_has_security(current, SECURITY__READ_POLICY);
433 if (ret)
434 goto out;
435
436 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
437 out:
438 mutex_unlock(&sel_mutex);
439 return ret;
440 }
441
442 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
443 struct vm_fault *vmf)
444 {
445 struct policy_load_memory *plm = vma->vm_file->private_data;
446 unsigned long offset;
447 struct page *page;
448
449 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
450 return VM_FAULT_SIGBUS;
451
452 offset = vmf->pgoff << PAGE_SHIFT;
453 if (offset >= roundup(plm->len, PAGE_SIZE))
454 return VM_FAULT_SIGBUS;
455
456 page = vmalloc_to_page(plm->data + offset);
457 get_page(page);
458
459 vmf->page = page;
460
461 return 0;
462 }
463
464 static const struct vm_operations_struct sel_mmap_policy_ops = {
465 .fault = sel_mmap_policy_fault,
466 .page_mkwrite = sel_mmap_policy_fault,
467 };
468
469 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
470 {
471 if (vma->vm_flags & VM_SHARED) {
472 /* do not allow mprotect to make mapping writable */
473 vma->vm_flags &= ~VM_MAYWRITE;
474
475 if (vma->vm_flags & VM_WRITE)
476 return -EACCES;
477 }
478
479 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
480 vma->vm_ops = &sel_mmap_policy_ops;
481
482 return 0;
483 }
484
485 static const struct file_operations sel_policy_ops = {
486 .open = sel_open_policy,
487 .read = sel_read_policy,
488 .mmap = sel_mmap_policy,
489 .release = sel_release_policy,
490 .llseek = generic_file_llseek,
491 };
492
493 static ssize_t sel_write_load(struct file *file, const char __user *buf,
494 size_t count, loff_t *ppos)
495
496 {
497 ssize_t length;
498 void *data = NULL;
499
500 mutex_lock(&sel_mutex);
501
502 length = task_has_security(current, SECURITY__LOAD_POLICY);
503 if (length)
504 goto out;
505
506 /* No partial writes. */
507 length = -EINVAL;
508 if (*ppos != 0)
509 goto out;
510
511 length = -EFBIG;
512 if (count > 64 * 1024 * 1024)
513 goto out;
514
515 length = -ENOMEM;
516 data = vmalloc(count);
517 if (!data)
518 goto out;
519
520 length = -EFAULT;
521 if (copy_from_user(data, buf, count) != 0)
522 goto out;
523
524 length = security_load_policy(data, count);
525 if (length)
526 goto out;
527
528 length = sel_make_bools();
529 if (length)
530 goto out1;
531
532 length = sel_make_classes();
533 if (length)
534 goto out1;
535
536 length = sel_make_policycap();
537 if (length)
538 goto out1;
539
540 length = count;
541
542 out1:
543 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
544 "policy loaded auid=%u ses=%u",
545 from_kuid(&init_user_ns, audit_get_loginuid(current)),
546 audit_get_sessionid(current));
547 out:
548 mutex_unlock(&sel_mutex);
549 vfree(data);
550 return length;
551 }
552
553 static const struct file_operations sel_load_ops = {
554 .write = sel_write_load,
555 .llseek = generic_file_llseek,
556 };
557
558 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
559 {
560 char *canon = NULL;
561 u32 sid, len;
562 ssize_t length;
563
564 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
565 if (length)
566 goto out;
567
568 length = security_context_to_sid(buf, size, &sid, GFP_KERNEL);
569 if (length)
570 goto out;
571
572 length = security_sid_to_context(sid, &canon, &len);
573 if (length)
574 goto out;
575
576 length = -ERANGE;
577 if (len > SIMPLE_TRANSACTION_LIMIT) {
578 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
579 "payload max\n", __func__, len);
580 goto out;
581 }
582
583 memcpy(buf, canon, len);
584 length = len;
585 out:
586 kfree(canon);
587 return length;
588 }
589
590 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
591 size_t count, loff_t *ppos)
592 {
593 char tmpbuf[TMPBUFLEN];
594 ssize_t length;
595
596 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
597 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
598 }
599
600 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
601 size_t count, loff_t *ppos)
602 {
603 char *page;
604 ssize_t length;
605 unsigned int new_value;
606
607 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
608 if (length)
609 return length;
610
611 if (count >= PAGE_SIZE)
612 return -ENOMEM;
613
614 /* No partial writes. */
615 if (*ppos != 0)
616 return -EINVAL;
617
618 page = memdup_user_nul(buf, count);
619 if (IS_ERR(page))
620 return PTR_ERR(page);
621
622 length = -EINVAL;
623 if (sscanf(page, "%u", &new_value) != 1)
624 goto out;
625
626 selinux_checkreqprot = new_value ? 1 : 0;
627 length = count;
628 out:
629 kfree(page);
630 return length;
631 }
632 static const struct file_operations sel_checkreqprot_ops = {
633 .read = sel_read_checkreqprot,
634 .write = sel_write_checkreqprot,
635 .llseek = generic_file_llseek,
636 };
637
638 static ssize_t sel_write_validatetrans(struct file *file,
639 const char __user *buf,
640 size_t count, loff_t *ppos)
641 {
642 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
643 char *req = NULL;
644 u32 osid, nsid, tsid;
645 u16 tclass;
646 int rc;
647
648 rc = task_has_security(current, SECURITY__VALIDATE_TRANS);
649 if (rc)
650 goto out;
651
652 rc = -ENOMEM;
653 if (count >= PAGE_SIZE)
654 goto out;
655
656 /* No partial writes. */
657 rc = -EINVAL;
658 if (*ppos != 0)
659 goto out;
660
661 rc = -ENOMEM;
662 req = kzalloc(count + 1, GFP_KERNEL);
663 if (!req)
664 goto out;
665
666 rc = -EFAULT;
667 if (copy_from_user(req, buf, count))
668 goto out;
669
670 rc = -ENOMEM;
671 oldcon = kzalloc(count + 1, GFP_KERNEL);
672 if (!oldcon)
673 goto out;
674
675 newcon = kzalloc(count + 1, GFP_KERNEL);
676 if (!newcon)
677 goto out;
678
679 taskcon = kzalloc(count + 1, GFP_KERNEL);
680 if (!taskcon)
681 goto out;
682
683 rc = -EINVAL;
684 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
685 goto out;
686
687 rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL);
688 if (rc)
689 goto out;
690
691 rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL);
692 if (rc)
693 goto out;
694
695 rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL);
696 if (rc)
697 goto out;
698
699 rc = security_validate_transition_user(osid, nsid, tsid, tclass);
700 if (!rc)
701 rc = count;
702 out:
703 kfree(req);
704 kfree(oldcon);
705 kfree(newcon);
706 kfree(taskcon);
707 return rc;
708 }
709
710 static const struct file_operations sel_transition_ops = {
711 .write = sel_write_validatetrans,
712 .llseek = generic_file_llseek,
713 };
714
715 /*
716 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
717 */
718 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
719 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
720 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
721 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
722 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
723
724 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
725 [SEL_ACCESS] = sel_write_access,
726 [SEL_CREATE] = sel_write_create,
727 [SEL_RELABEL] = sel_write_relabel,
728 [SEL_USER] = sel_write_user,
729 [SEL_MEMBER] = sel_write_member,
730 [SEL_CONTEXT] = sel_write_context,
731 };
732
733 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
734 {
735 ino_t ino = file_inode(file)->i_ino;
736 char *data;
737 ssize_t rv;
738
739 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
740 return -EINVAL;
741
742 data = simple_transaction_get(file, buf, size);
743 if (IS_ERR(data))
744 return PTR_ERR(data);
745
746 rv = write_op[ino](file, data, size);
747 if (rv > 0) {
748 simple_transaction_set(file, rv);
749 rv = size;
750 }
751 return rv;
752 }
753
754 static const struct file_operations transaction_ops = {
755 .write = selinux_transaction_write,
756 .read = simple_transaction_read,
757 .release = simple_transaction_release,
758 .llseek = generic_file_llseek,
759 };
760
761 /*
762 * payload - write methods
763 * If the method has a response, the response should be put in buf,
764 * and the length returned. Otherwise return 0 or and -error.
765 */
766
767 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
768 {
769 char *scon = NULL, *tcon = NULL;
770 u32 ssid, tsid;
771 u16 tclass;
772 struct av_decision avd;
773 ssize_t length;
774
775 length = task_has_security(current, SECURITY__COMPUTE_AV);
776 if (length)
777 goto out;
778
779 length = -ENOMEM;
780 scon = kzalloc(size + 1, GFP_KERNEL);
781 if (!scon)
782 goto out;
783
784 length = -ENOMEM;
785 tcon = kzalloc(size + 1, GFP_KERNEL);
786 if (!tcon)
787 goto out;
788
789 length = -EINVAL;
790 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
791 goto out;
792
793 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
794 if (length)
795 goto out;
796
797 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
798 if (length)
799 goto out;
800
801 security_compute_av_user(ssid, tsid, tclass, &avd);
802
803 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
804 "%x %x %x %x %u %x",
805 avd.allowed, 0xffffffff,
806 avd.auditallow, avd.auditdeny,
807 avd.seqno, avd.flags);
808 out:
809 kfree(tcon);
810 kfree(scon);
811 return length;
812 }
813
814 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
815 {
816 char *scon = NULL, *tcon = NULL;
817 char *namebuf = NULL, *objname = NULL;
818 u32 ssid, tsid, newsid;
819 u16 tclass;
820 ssize_t length;
821 char *newcon = NULL;
822 u32 len;
823 int nargs;
824
825 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
826 if (length)
827 goto out;
828
829 length = -ENOMEM;
830 scon = kzalloc(size + 1, GFP_KERNEL);
831 if (!scon)
832 goto out;
833
834 length = -ENOMEM;
835 tcon = kzalloc(size + 1, GFP_KERNEL);
836 if (!tcon)
837 goto out;
838
839 length = -ENOMEM;
840 namebuf = kzalloc(size + 1, GFP_KERNEL);
841 if (!namebuf)
842 goto out;
843
844 length = -EINVAL;
845 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
846 if (nargs < 3 || nargs > 4)
847 goto out;
848 if (nargs == 4) {
849 /*
850 * If and when the name of new object to be queried contains
851 * either whitespace or multibyte characters, they shall be
852 * encoded based on the percentage-encoding rule.
853 * If not encoded, the sscanf logic picks up only left-half
854 * of the supplied name; splitted by a whitespace unexpectedly.
855 */
856 char *r, *w;
857 int c1, c2;
858
859 r = w = namebuf;
860 do {
861 c1 = *r++;
862 if (c1 == '+')
863 c1 = ' ';
864 else if (c1 == '%') {
865 c1 = hex_to_bin(*r++);
866 if (c1 < 0)
867 goto out;
868 c2 = hex_to_bin(*r++);
869 if (c2 < 0)
870 goto out;
871 c1 = (c1 << 4) | c2;
872 }
873 *w++ = c1;
874 } while (c1 != '\0');
875
876 objname = namebuf;
877 }
878
879 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
880 if (length)
881 goto out;
882
883 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
884 if (length)
885 goto out;
886
887 length = security_transition_sid_user(ssid, tsid, tclass,
888 objname, &newsid);
889 if (length)
890 goto out;
891
892 length = security_sid_to_context(newsid, &newcon, &len);
893 if (length)
894 goto out;
895
896 length = -ERANGE;
897 if (len > SIMPLE_TRANSACTION_LIMIT) {
898 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
899 "payload max\n", __func__, len);
900 goto out;
901 }
902
903 memcpy(buf, newcon, len);
904 length = len;
905 out:
906 kfree(newcon);
907 kfree(namebuf);
908 kfree(tcon);
909 kfree(scon);
910 return length;
911 }
912
913 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
914 {
915 char *scon = NULL, *tcon = NULL;
916 u32 ssid, tsid, newsid;
917 u16 tclass;
918 ssize_t length;
919 char *newcon = NULL;
920 u32 len;
921
922 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
923 if (length)
924 goto out;
925
926 length = -ENOMEM;
927 scon = kzalloc(size + 1, GFP_KERNEL);
928 if (!scon)
929 goto out;
930
931 length = -ENOMEM;
932 tcon = kzalloc(size + 1, GFP_KERNEL);
933 if (!tcon)
934 goto out;
935
936 length = -EINVAL;
937 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
938 goto out;
939
940 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
941 if (length)
942 goto out;
943
944 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
945 if (length)
946 goto out;
947
948 length = security_change_sid(ssid, tsid, tclass, &newsid);
949 if (length)
950 goto out;
951
952 length = security_sid_to_context(newsid, &newcon, &len);
953 if (length)
954 goto out;
955
956 length = -ERANGE;
957 if (len > SIMPLE_TRANSACTION_LIMIT)
958 goto out;
959
960 memcpy(buf, newcon, len);
961 length = len;
962 out:
963 kfree(newcon);
964 kfree(tcon);
965 kfree(scon);
966 return length;
967 }
968
969 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
970 {
971 char *con = NULL, *user = NULL, *ptr;
972 u32 sid, *sids = NULL;
973 ssize_t length;
974 char *newcon;
975 int i, rc;
976 u32 len, nsids;
977
978 length = task_has_security(current, SECURITY__COMPUTE_USER);
979 if (length)
980 goto out;
981
982 length = -ENOMEM;
983 con = kzalloc(size + 1, GFP_KERNEL);
984 if (!con)
985 goto out;
986
987 length = -ENOMEM;
988 user = kzalloc(size + 1, GFP_KERNEL);
989 if (!user)
990 goto out;
991
992 length = -EINVAL;
993 if (sscanf(buf, "%s %s", con, user) != 2)
994 goto out;
995
996 length = security_context_str_to_sid(con, &sid, GFP_KERNEL);
997 if (length)
998 goto out;
999
1000 length = security_get_user_sids(sid, user, &sids, &nsids);
1001 if (length)
1002 goto out;
1003
1004 length = sprintf(buf, "%u", nsids) + 1;
1005 ptr = buf + length;
1006 for (i = 0; i < nsids; i++) {
1007 rc = security_sid_to_context(sids[i], &newcon, &len);
1008 if (rc) {
1009 length = rc;
1010 goto out;
1011 }
1012 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1013 kfree(newcon);
1014 length = -ERANGE;
1015 goto out;
1016 }
1017 memcpy(ptr, newcon, len);
1018 kfree(newcon);
1019 ptr += len;
1020 length += len;
1021 }
1022 out:
1023 kfree(sids);
1024 kfree(user);
1025 kfree(con);
1026 return length;
1027 }
1028
1029 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1030 {
1031 char *scon = NULL, *tcon = NULL;
1032 u32 ssid, tsid, newsid;
1033 u16 tclass;
1034 ssize_t length;
1035 char *newcon = NULL;
1036 u32 len;
1037
1038 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
1039 if (length)
1040 goto out;
1041
1042 length = -ENOMEM;
1043 scon = kzalloc(size + 1, GFP_KERNEL);
1044 if (!scon)
1045 goto out;
1046
1047 length = -ENOMEM;
1048 tcon = kzalloc(size + 1, GFP_KERNEL);
1049 if (!tcon)
1050 goto out;
1051
1052 length = -EINVAL;
1053 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1054 goto out;
1055
1056 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
1057 if (length)
1058 goto out;
1059
1060 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
1061 if (length)
1062 goto out;
1063
1064 length = security_member_sid(ssid, tsid, tclass, &newsid);
1065 if (length)
1066 goto out;
1067
1068 length = security_sid_to_context(newsid, &newcon, &len);
1069 if (length)
1070 goto out;
1071
1072 length = -ERANGE;
1073 if (len > SIMPLE_TRANSACTION_LIMIT) {
1074 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
1075 "payload max\n", __func__, len);
1076 goto out;
1077 }
1078
1079 memcpy(buf, newcon, len);
1080 length = len;
1081 out:
1082 kfree(newcon);
1083 kfree(tcon);
1084 kfree(scon);
1085 return length;
1086 }
1087
1088 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1089 {
1090 struct inode *ret = new_inode(sb);
1091
1092 if (ret) {
1093 ret->i_mode = mode;
1094 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1095 }
1096 return ret;
1097 }
1098
1099 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1100 size_t count, loff_t *ppos)
1101 {
1102 char *page = NULL;
1103 ssize_t length;
1104 ssize_t ret;
1105 int cur_enforcing;
1106 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1107 const char *name = filep->f_path.dentry->d_name.name;
1108
1109 mutex_lock(&sel_mutex);
1110
1111 ret = -EINVAL;
1112 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1113 goto out;
1114
1115 ret = -ENOMEM;
1116 page = (char *)get_zeroed_page(GFP_KERNEL);
1117 if (!page)
1118 goto out;
1119
1120 cur_enforcing = security_get_bool_value(index);
1121 if (cur_enforcing < 0) {
1122 ret = cur_enforcing;
1123 goto out;
1124 }
1125 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1126 bool_pending_values[index]);
1127 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1128 out:
1129 mutex_unlock(&sel_mutex);
1130 free_page((unsigned long)page);
1131 return ret;
1132 }
1133
1134 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1135 size_t count, loff_t *ppos)
1136 {
1137 char *page = NULL;
1138 ssize_t length;
1139 int new_value;
1140 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1141 const char *name = filep->f_path.dentry->d_name.name;
1142
1143 mutex_lock(&sel_mutex);
1144
1145 length = task_has_security(current, SECURITY__SETBOOL);
1146 if (length)
1147 goto out;
1148
1149 length = -EINVAL;
1150 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1151 goto out;
1152
1153 length = -ENOMEM;
1154 if (count >= PAGE_SIZE)
1155 goto out;
1156
1157 /* No partial writes. */
1158 length = -EINVAL;
1159 if (*ppos != 0)
1160 goto out;
1161
1162 page = memdup_user_nul(buf, count);
1163 if (IS_ERR(page)) {
1164 length = PTR_ERR(page);
1165 page = NULL;
1166 goto out;
1167 }
1168
1169 length = -EINVAL;
1170 if (sscanf(page, "%d", &new_value) != 1)
1171 goto out;
1172
1173 if (new_value)
1174 new_value = 1;
1175
1176 bool_pending_values[index] = new_value;
1177 length = count;
1178
1179 out:
1180 mutex_unlock(&sel_mutex);
1181 kfree(page);
1182 return length;
1183 }
1184
1185 static const struct file_operations sel_bool_ops = {
1186 .read = sel_read_bool,
1187 .write = sel_write_bool,
1188 .llseek = generic_file_llseek,
1189 };
1190
1191 static ssize_t sel_commit_bools_write(struct file *filep,
1192 const char __user *buf,
1193 size_t count, loff_t *ppos)
1194 {
1195 char *page = NULL;
1196 ssize_t length;
1197 int new_value;
1198
1199 mutex_lock(&sel_mutex);
1200
1201 length = task_has_security(current, SECURITY__SETBOOL);
1202 if (length)
1203 goto out;
1204
1205 length = -ENOMEM;
1206 if (count >= PAGE_SIZE)
1207 goto out;
1208
1209 /* No partial writes. */
1210 length = -EINVAL;
1211 if (*ppos != 0)
1212 goto out;
1213
1214 page = memdup_user_nul(buf, count);
1215 if (IS_ERR(page)) {
1216 length = PTR_ERR(page);
1217 page = NULL;
1218 goto out;
1219 }
1220
1221 length = -EINVAL;
1222 if (sscanf(page, "%d", &new_value) != 1)
1223 goto out;
1224
1225 length = 0;
1226 if (new_value && bool_pending_values)
1227 length = security_set_bools(bool_num, bool_pending_values);
1228
1229 if (!length)
1230 length = count;
1231
1232 out:
1233 mutex_unlock(&sel_mutex);
1234 kfree(page);
1235 return length;
1236 }
1237
1238 static const struct file_operations sel_commit_bools_ops = {
1239 .write = sel_commit_bools_write,
1240 .llseek = generic_file_llseek,
1241 };
1242
1243 static void sel_remove_entries(struct dentry *de)
1244 {
1245 d_genocide(de);
1246 shrink_dcache_parent(de);
1247 }
1248
1249 #define BOOL_DIR_NAME "booleans"
1250
1251 static int sel_make_bools(void)
1252 {
1253 int i, ret;
1254 ssize_t len;
1255 struct dentry *dentry = NULL;
1256 struct dentry *dir = bool_dir;
1257 struct inode *inode = NULL;
1258 struct inode_security_struct *isec;
1259 char **names = NULL, *page;
1260 int num;
1261 int *values = NULL;
1262 u32 sid;
1263
1264 /* remove any existing files */
1265 for (i = 0; i < bool_num; i++)
1266 kfree(bool_pending_names[i]);
1267 kfree(bool_pending_names);
1268 kfree(bool_pending_values);
1269 bool_num = 0;
1270 bool_pending_names = NULL;
1271 bool_pending_values = NULL;
1272
1273 sel_remove_entries(dir);
1274
1275 ret = -ENOMEM;
1276 page = (char *)get_zeroed_page(GFP_KERNEL);
1277 if (!page)
1278 goto out;
1279
1280 ret = security_get_bools(&num, &names, &values);
1281 if (ret)
1282 goto out;
1283
1284 for (i = 0; i < num; i++) {
1285 ret = -ENOMEM;
1286 dentry = d_alloc_name(dir, names[i]);
1287 if (!dentry)
1288 goto out;
1289
1290 ret = -ENOMEM;
1291 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1292 if (!inode)
1293 goto out;
1294
1295 ret = -ENAMETOOLONG;
1296 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1297 if (len >= PAGE_SIZE)
1298 goto out;
1299
1300 isec = (struct inode_security_struct *)inode->i_security;
1301 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1302 if (ret)
1303 goto out;
1304
1305 isec->sid = sid;
1306 isec->initialized = LABEL_INITIALIZED;
1307 inode->i_fop = &sel_bool_ops;
1308 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1309 d_add(dentry, inode);
1310 }
1311 bool_num = num;
1312 bool_pending_names = names;
1313 bool_pending_values = values;
1314
1315 free_page((unsigned long)page);
1316 return 0;
1317 out:
1318 free_page((unsigned long)page);
1319
1320 if (names) {
1321 for (i = 0; i < num; i++)
1322 kfree(names[i]);
1323 kfree(names);
1324 }
1325 kfree(values);
1326 sel_remove_entries(dir);
1327
1328 return ret;
1329 }
1330
1331 #define NULL_FILE_NAME "null"
1332
1333 struct path selinux_null;
1334
1335 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1336 size_t count, loff_t *ppos)
1337 {
1338 char tmpbuf[TMPBUFLEN];
1339 ssize_t length;
1340
1341 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1342 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1343 }
1344
1345 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1346 const char __user *buf,
1347 size_t count, loff_t *ppos)
1348
1349 {
1350 char *page;
1351 ssize_t ret;
1352 unsigned int new_value;
1353
1354 ret = task_has_security(current, SECURITY__SETSECPARAM);
1355 if (ret)
1356 return ret;
1357
1358 if (count >= PAGE_SIZE)
1359 return -ENOMEM;
1360
1361 /* No partial writes. */
1362 if (*ppos != 0)
1363 return -EINVAL;
1364
1365 page = memdup_user_nul(buf, count);
1366 if (IS_ERR(page))
1367 return PTR_ERR(page);
1368
1369 ret = -EINVAL;
1370 if (sscanf(page, "%u", &new_value) != 1)
1371 goto out;
1372
1373 avc_cache_threshold = new_value;
1374
1375 ret = count;
1376 out:
1377 kfree(page);
1378 return ret;
1379 }
1380
1381 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1382 size_t count, loff_t *ppos)
1383 {
1384 char *page;
1385 ssize_t length;
1386
1387 page = (char *)__get_free_page(GFP_KERNEL);
1388 if (!page)
1389 return -ENOMEM;
1390
1391 length = avc_get_hash_stats(page);
1392 if (length >= 0)
1393 length = simple_read_from_buffer(buf, count, ppos, page, length);
1394 free_page((unsigned long)page);
1395
1396 return length;
1397 }
1398
1399 static const struct file_operations sel_avc_cache_threshold_ops = {
1400 .read = sel_read_avc_cache_threshold,
1401 .write = sel_write_avc_cache_threshold,
1402 .llseek = generic_file_llseek,
1403 };
1404
1405 static const struct file_operations sel_avc_hash_stats_ops = {
1406 .read = sel_read_avc_hash_stats,
1407 .llseek = generic_file_llseek,
1408 };
1409
1410 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1411 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1412 {
1413 int cpu;
1414
1415 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1416 if (!cpu_possible(cpu))
1417 continue;
1418 *idx = cpu + 1;
1419 return &per_cpu(avc_cache_stats, cpu);
1420 }
1421 return NULL;
1422 }
1423
1424 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1425 {
1426 loff_t n = *pos - 1;
1427
1428 if (*pos == 0)
1429 return SEQ_START_TOKEN;
1430
1431 return sel_avc_get_stat_idx(&n);
1432 }
1433
1434 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1435 {
1436 return sel_avc_get_stat_idx(pos);
1437 }
1438
1439 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1440 {
1441 struct avc_cache_stats *st = v;
1442
1443 if (v == SEQ_START_TOKEN)
1444 seq_printf(seq, "lookups hits misses allocations reclaims "
1445 "frees\n");
1446 else {
1447 unsigned int lookups = st->lookups;
1448 unsigned int misses = st->misses;
1449 unsigned int hits = lookups - misses;
1450 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1451 hits, misses, st->allocations,
1452 st->reclaims, st->frees);
1453 }
1454 return 0;
1455 }
1456
1457 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1458 { }
1459
1460 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1461 .start = sel_avc_stats_seq_start,
1462 .next = sel_avc_stats_seq_next,
1463 .show = sel_avc_stats_seq_show,
1464 .stop = sel_avc_stats_seq_stop,
1465 };
1466
1467 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1468 {
1469 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1470 }
1471
1472 static const struct file_operations sel_avc_cache_stats_ops = {
1473 .open = sel_open_avc_cache_stats,
1474 .read = seq_read,
1475 .llseek = seq_lseek,
1476 .release = seq_release,
1477 };
1478 #endif
1479
1480 static int sel_make_avc_files(struct dentry *dir)
1481 {
1482 int i;
1483 static struct tree_descr files[] = {
1484 { "cache_threshold",
1485 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1486 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1487 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1488 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1489 #endif
1490 };
1491
1492 for (i = 0; i < ARRAY_SIZE(files); i++) {
1493 struct inode *inode;
1494 struct dentry *dentry;
1495
1496 dentry = d_alloc_name(dir, files[i].name);
1497 if (!dentry)
1498 return -ENOMEM;
1499
1500 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1501 if (!inode)
1502 return -ENOMEM;
1503
1504 inode->i_fop = files[i].ops;
1505 inode->i_ino = ++sel_last_ino;
1506 d_add(dentry, inode);
1507 }
1508
1509 return 0;
1510 }
1511
1512 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1513 size_t count, loff_t *ppos)
1514 {
1515 char *con;
1516 u32 sid, len;
1517 ssize_t ret;
1518
1519 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1520 ret = security_sid_to_context(sid, &con, &len);
1521 if (ret)
1522 return ret;
1523
1524 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1525 kfree(con);
1526 return ret;
1527 }
1528
1529 static const struct file_operations sel_initcon_ops = {
1530 .read = sel_read_initcon,
1531 .llseek = generic_file_llseek,
1532 };
1533
1534 static int sel_make_initcon_files(struct dentry *dir)
1535 {
1536 int i;
1537
1538 for (i = 1; i <= SECINITSID_NUM; i++) {
1539 struct inode *inode;
1540 struct dentry *dentry;
1541 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1542 if (!dentry)
1543 return -ENOMEM;
1544
1545 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1546 if (!inode)
1547 return -ENOMEM;
1548
1549 inode->i_fop = &sel_initcon_ops;
1550 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1551 d_add(dentry, inode);
1552 }
1553
1554 return 0;
1555 }
1556
1557 static inline unsigned long sel_class_to_ino(u16 class)
1558 {
1559 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1560 }
1561
1562 static inline u16 sel_ino_to_class(unsigned long ino)
1563 {
1564 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1565 }
1566
1567 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1568 {
1569 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1570 }
1571
1572 static inline u32 sel_ino_to_perm(unsigned long ino)
1573 {
1574 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1575 }
1576
1577 static ssize_t sel_read_class(struct file *file, char __user *buf,
1578 size_t count, loff_t *ppos)
1579 {
1580 unsigned long ino = file_inode(file)->i_ino;
1581 char res[TMPBUFLEN];
1582 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1583 return simple_read_from_buffer(buf, count, ppos, res, len);
1584 }
1585
1586 static const struct file_operations sel_class_ops = {
1587 .read = sel_read_class,
1588 .llseek = generic_file_llseek,
1589 };
1590
1591 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1592 size_t count, loff_t *ppos)
1593 {
1594 unsigned long ino = file_inode(file)->i_ino;
1595 char res[TMPBUFLEN];
1596 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1597 return simple_read_from_buffer(buf, count, ppos, res, len);
1598 }
1599
1600 static const struct file_operations sel_perm_ops = {
1601 .read = sel_read_perm,
1602 .llseek = generic_file_llseek,
1603 };
1604
1605 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1606 size_t count, loff_t *ppos)
1607 {
1608 int value;
1609 char tmpbuf[TMPBUFLEN];
1610 ssize_t length;
1611 unsigned long i_ino = file_inode(file)->i_ino;
1612
1613 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1614 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1615
1616 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1617 }
1618
1619 static const struct file_operations sel_policycap_ops = {
1620 .read = sel_read_policycap,
1621 .llseek = generic_file_llseek,
1622 };
1623
1624 static int sel_make_perm_files(char *objclass, int classvalue,
1625 struct dentry *dir)
1626 {
1627 int i, rc, nperms;
1628 char **perms;
1629
1630 rc = security_get_permissions(objclass, &perms, &nperms);
1631 if (rc)
1632 return rc;
1633
1634 for (i = 0; i < nperms; i++) {
1635 struct inode *inode;
1636 struct dentry *dentry;
1637
1638 rc = -ENOMEM;
1639 dentry = d_alloc_name(dir, perms[i]);
1640 if (!dentry)
1641 goto out;
1642
1643 rc = -ENOMEM;
1644 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1645 if (!inode)
1646 goto out;
1647
1648 inode->i_fop = &sel_perm_ops;
1649 /* i+1 since perm values are 1-indexed */
1650 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1651 d_add(dentry, inode);
1652 }
1653 rc = 0;
1654 out:
1655 for (i = 0; i < nperms; i++)
1656 kfree(perms[i]);
1657 kfree(perms);
1658 return rc;
1659 }
1660
1661 static int sel_make_class_dir_entries(char *classname, int index,
1662 struct dentry *dir)
1663 {
1664 struct dentry *dentry = NULL;
1665 struct inode *inode = NULL;
1666 int rc;
1667
1668 dentry = d_alloc_name(dir, "index");
1669 if (!dentry)
1670 return -ENOMEM;
1671
1672 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1673 if (!inode)
1674 return -ENOMEM;
1675
1676 inode->i_fop = &sel_class_ops;
1677 inode->i_ino = sel_class_to_ino(index);
1678 d_add(dentry, inode);
1679
1680 dentry = sel_make_dir(dir, "perms", &last_class_ino);
1681 if (IS_ERR(dentry))
1682 return PTR_ERR(dentry);
1683
1684 rc = sel_make_perm_files(classname, index, dentry);
1685
1686 return rc;
1687 }
1688
1689 static int sel_make_classes(void)
1690 {
1691 int rc, nclasses, i;
1692 char **classes;
1693
1694 /* delete any existing entries */
1695 sel_remove_entries(class_dir);
1696
1697 rc = security_get_classes(&classes, &nclasses);
1698 if (rc)
1699 return rc;
1700
1701 /* +2 since classes are 1-indexed */
1702 last_class_ino = sel_class_to_ino(nclasses + 2);
1703
1704 for (i = 0; i < nclasses; i++) {
1705 struct dentry *class_name_dir;
1706
1707 class_name_dir = sel_make_dir(class_dir, classes[i],
1708 &last_class_ino);
1709 if (IS_ERR(class_name_dir)) {
1710 rc = PTR_ERR(class_name_dir);
1711 goto out;
1712 }
1713
1714 /* i+1 since class values are 1-indexed */
1715 rc = sel_make_class_dir_entries(classes[i], i + 1,
1716 class_name_dir);
1717 if (rc)
1718 goto out;
1719 }
1720 rc = 0;
1721 out:
1722 for (i = 0; i < nclasses; i++)
1723 kfree(classes[i]);
1724 kfree(classes);
1725 return rc;
1726 }
1727
1728 static int sel_make_policycap(void)
1729 {
1730 unsigned int iter;
1731 struct dentry *dentry = NULL;
1732 struct inode *inode = NULL;
1733
1734 sel_remove_entries(policycap_dir);
1735
1736 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1737 if (iter < ARRAY_SIZE(policycap_names))
1738 dentry = d_alloc_name(policycap_dir,
1739 policycap_names[iter]);
1740 else
1741 dentry = d_alloc_name(policycap_dir, "unknown");
1742
1743 if (dentry == NULL)
1744 return -ENOMEM;
1745
1746 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1747 if (inode == NULL)
1748 return -ENOMEM;
1749
1750 inode->i_fop = &sel_policycap_ops;
1751 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1752 d_add(dentry, inode);
1753 }
1754
1755 return 0;
1756 }
1757
1758 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1759 unsigned long *ino)
1760 {
1761 struct dentry *dentry = d_alloc_name(dir, name);
1762 struct inode *inode;
1763
1764 if (!dentry)
1765 return ERR_PTR(-ENOMEM);
1766
1767 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1768 if (!inode) {
1769 dput(dentry);
1770 return ERR_PTR(-ENOMEM);
1771 }
1772
1773 inode->i_op = &simple_dir_inode_operations;
1774 inode->i_fop = &simple_dir_operations;
1775 inode->i_ino = ++(*ino);
1776 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1777 inc_nlink(inode);
1778 d_add(dentry, inode);
1779 /* bump link count on parent directory, too */
1780 inc_nlink(d_inode(dir));
1781
1782 return dentry;
1783 }
1784
1785 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1786 {
1787 int ret;
1788 struct dentry *dentry;
1789 struct inode *inode;
1790 struct inode_security_struct *isec;
1791
1792 static struct tree_descr selinux_files[] = {
1793 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1794 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1795 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1796 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1797 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1798 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1799 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1800 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1801 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1802 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1803 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1804 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1805 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1806 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1807 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1808 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1809 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1810 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1811 S_IWUGO},
1812 /* last one */ {""}
1813 };
1814 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1815 if (ret)
1816 goto err;
1817
1818 bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
1819 if (IS_ERR(bool_dir)) {
1820 ret = PTR_ERR(bool_dir);
1821 bool_dir = NULL;
1822 goto err;
1823 }
1824
1825 ret = -ENOMEM;
1826 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1827 if (!dentry)
1828 goto err;
1829
1830 ret = -ENOMEM;
1831 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1832 if (!inode)
1833 goto err;
1834
1835 inode->i_ino = ++sel_last_ino;
1836 isec = (struct inode_security_struct *)inode->i_security;
1837 isec->sid = SECINITSID_DEVNULL;
1838 isec->sclass = SECCLASS_CHR_FILE;
1839 isec->initialized = LABEL_INITIALIZED;
1840
1841 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1842 d_add(dentry, inode);
1843 selinux_null.dentry = dentry;
1844
1845 dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
1846 if (IS_ERR(dentry)) {
1847 ret = PTR_ERR(dentry);
1848 goto err;
1849 }
1850
1851 ret = sel_make_avc_files(dentry);
1852 if (ret)
1853 goto err;
1854
1855 dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
1856 if (IS_ERR(dentry)) {
1857 ret = PTR_ERR(dentry);
1858 goto err;
1859 }
1860
1861 ret = sel_make_initcon_files(dentry);
1862 if (ret)
1863 goto err;
1864
1865 class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
1866 if (IS_ERR(class_dir)) {
1867 ret = PTR_ERR(class_dir);
1868 class_dir = NULL;
1869 goto err;
1870 }
1871
1872 policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
1873 if (IS_ERR(policycap_dir)) {
1874 ret = PTR_ERR(policycap_dir);
1875 policycap_dir = NULL;
1876 goto err;
1877 }
1878 return 0;
1879 err:
1880 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1881 __func__);
1882 return ret;
1883 }
1884
1885 static struct dentry *sel_mount(struct file_system_type *fs_type,
1886 int flags, const char *dev_name, void *data)
1887 {
1888 return mount_single(fs_type, flags, data, sel_fill_super);
1889 }
1890
1891 static struct file_system_type sel_fs_type = {
1892 .name = "selinuxfs",
1893 .mount = sel_mount,
1894 .kill_sb = kill_litter_super,
1895 };
1896
1897 struct vfsmount *selinuxfs_mount;
1898
1899 static int __init init_sel_fs(void)
1900 {
1901 int err;
1902
1903 if (!selinux_enabled)
1904 return 0;
1905
1906 err = sysfs_create_mount_point(fs_kobj, "selinux");
1907 if (err)
1908 return err;
1909
1910 err = register_filesystem(&sel_fs_type);
1911 if (err) {
1912 sysfs_remove_mount_point(fs_kobj, "selinux");
1913 return err;
1914 }
1915
1916 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
1917 if (IS_ERR(selinuxfs_mount)) {
1918 printk(KERN_ERR "selinuxfs: could not mount!\n");
1919 err = PTR_ERR(selinuxfs_mount);
1920 selinuxfs_mount = NULL;
1921 }
1922
1923 return err;
1924 }
1925
1926 __initcall(init_sel_fs);
1927
1928 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1929 void exit_sel_fs(void)
1930 {
1931 sysfs_remove_mount_point(fs_kobj, "selinux");
1932 kern_unmount(selinuxfs_mount);
1933 unregister_filesystem(&sel_fs_type);
1934 }
1935 #endif