Loading...
1/*
2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, version 2.
7 *
8 * Authors:
9 * Casey Schaufler <casey@schaufler-ca.com>
10 * Ahmed S. Darwish <darwish.07@gmail.com>
11 *
12 * Special thanks to the authors of selinuxfs.
13 *
14 * Karl MacMillan <kmacmillan@tresys.com>
15 * James Morris <jmorris@redhat.com>
16 *
17 */
18
19#include <linux/kernel.h>
20#include <linux/vmalloc.h>
21#include <linux/security.h>
22#include <linux/mutex.h>
23#include <linux/slab.h>
24#include <net/net_namespace.h>
25#include <net/netlabel.h>
26#include <net/cipso_ipv4.h>
27#include <linux/seq_file.h>
28#include <linux/ctype.h>
29#include <linux/audit.h>
30#include "smack.h"
31
32/*
33 * smackfs pseudo filesystem.
34 */
35
36enum smk_inos {
37 SMK_ROOT_INO = 2,
38 SMK_LOAD = 3, /* load policy */
39 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
40 SMK_DOI = 5, /* CIPSO DOI */
41 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
42 SMK_AMBIENT = 7, /* internet ambient label */
43 SMK_NETLBLADDR = 8, /* single label hosts */
44 SMK_ONLYCAP = 9, /* the only "capable" label */
45 SMK_LOGGING = 10, /* logging */
46 SMK_LOAD_SELF = 11, /* task specific rules */
47};
48
49/*
50 * List locks
51 */
52static DEFINE_MUTEX(smack_list_lock);
53static DEFINE_MUTEX(smack_cipso_lock);
54static DEFINE_MUTEX(smack_ambient_lock);
55static DEFINE_MUTEX(smk_netlbladdr_lock);
56
57/*
58 * This is the "ambient" label for network traffic.
59 * If it isn't somehow marked, use this.
60 * It can be reset via smackfs/ambient
61 */
62char *smack_net_ambient = smack_known_floor.smk_known;
63
64/*
65 * This is the level in a CIPSO header that indicates a
66 * smack label is contained directly in the category set.
67 * It can be reset via smackfs/direct
68 */
69int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
70
71/*
72 * Unless a process is running with this label even
73 * having CAP_MAC_OVERRIDE isn't enough to grant
74 * privilege to violate MAC policy. If no label is
75 * designated (the NULL case) capabilities apply to
76 * everyone. It is expected that the hat (^) label
77 * will be used if any label is used.
78 */
79char *smack_onlycap;
80
81/*
82 * Certain IP addresses may be designated as single label hosts.
83 * Packets are sent there unlabeled, but only from tasks that
84 * can write to the specified label.
85 */
86
87LIST_HEAD(smk_netlbladdr_list);
88LIST_HEAD(smack_rule_list);
89
90static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
91
92const char *smack_cipso_option = SMACK_CIPSO_OPTION;
93
94
95#define SEQ_READ_FINISHED 1
96
97/*
98 * Values for parsing cipso rules
99 * SMK_DIGITLEN: Length of a digit field in a rule.
100 * SMK_CIPSOMIN: Minimum possible cipso rule length.
101 * SMK_CIPSOMAX: Maximum possible cipso rule length.
102 */
103#define SMK_DIGITLEN 4
104#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
105#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
106
107/*
108 * Values for parsing MAC rules
109 * SMK_ACCESS: Maximum possible combination of access permissions
110 * SMK_ACCESSLEN: Maximum length for a rule access field
111 * SMK_LOADLEN: Smack rule length
112 */
113#define SMK_OACCESS "rwxa"
114#define SMK_ACCESS "rwxat"
115#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
116#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
117#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
118#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
119
120/**
121 * smk_netlabel_audit_set - fill a netlbl_audit struct
122 * @nap: structure to fill
123 */
124static void smk_netlabel_audit_set(struct netlbl_audit *nap)
125{
126 nap->loginuid = audit_get_loginuid(current);
127 nap->sessionid = audit_get_sessionid(current);
128 nap->secid = smack_to_secid(smk_of_current());
129}
130
131/*
132 * Values for parsing single label host rules
133 * "1.2.3.4 X"
134 * "192.168.138.129/32 abcdefghijklmnopqrstuvw"
135 */
136#define SMK_NETLBLADDRMIN 9
137#define SMK_NETLBLADDRMAX 42
138
139/**
140 * smk_set_access - add a rule to the rule list
141 * @srp: the new rule to add
142 * @rule_list: the list of rules
143 * @rule_lock: the rule list lock
144 *
145 * Looks through the current subject/object/access list for
146 * the subject/object pair and replaces the access that was
147 * there. If the pair isn't found add it with the specified
148 * access.
149 *
150 * Returns 1 if a rule was found to exist already, 0 if it is new
151 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
152 * during the allocation of the new pair to add.
153 */
154static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list,
155 struct mutex *rule_lock)
156{
157 struct smack_rule *sp;
158 int found = 0;
159
160 mutex_lock(rule_lock);
161
162 list_for_each_entry_rcu(sp, rule_list, list) {
163 if (sp->smk_subject == srp->smk_subject &&
164 sp->smk_object == srp->smk_object) {
165 found = 1;
166 sp->smk_access = srp->smk_access;
167 break;
168 }
169 }
170 if (found == 0)
171 list_add_rcu(&srp->list, rule_list);
172
173 mutex_unlock(rule_lock);
174
175 return found;
176}
177
178/**
179 * smk_write_load_list - write() for any /smack/load
180 * @file: file pointer, not actually used
181 * @buf: where to get the data from
182 * @count: bytes sent
183 * @ppos: where to start - must be 0
184 * @rule_list: the list of rules to write to
185 * @rule_lock: lock for the rule list
186 *
187 * Get one smack access rule from above.
188 * The format is exactly:
189 * char subject[SMK_LABELLEN]
190 * char object[SMK_LABELLEN]
191 * char access[SMK_ACCESSLEN]
192 *
193 * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes.
194 */
195static ssize_t smk_write_load_list(struct file *file, const char __user *buf,
196 size_t count, loff_t *ppos,
197 struct list_head *rule_list,
198 struct mutex *rule_lock)
199{
200 struct smack_rule *rule;
201 char *data;
202 int rc = -EINVAL;
203
204 /*
205 * No partial writes.
206 * Enough data must be present.
207 */
208 if (*ppos != 0)
209 return -EINVAL;
210 /*
211 * Minor hack for backward compatibility
212 */
213 if (count < (SMK_OLOADLEN) || count > SMK_LOADLEN)
214 return -EINVAL;
215
216 data = kzalloc(SMK_LOADLEN, GFP_KERNEL);
217 if (data == NULL)
218 return -ENOMEM;
219
220 if (copy_from_user(data, buf, count) != 0) {
221 rc = -EFAULT;
222 goto out;
223 }
224
225 /*
226 * More on the minor hack for backward compatibility
227 */
228 if (count == (SMK_OLOADLEN))
229 data[SMK_OLOADLEN] = '-';
230
231 rule = kzalloc(sizeof(*rule), GFP_KERNEL);
232 if (rule == NULL) {
233 rc = -ENOMEM;
234 goto out;
235 }
236
237 rule->smk_subject = smk_import(data, 0);
238 if (rule->smk_subject == NULL)
239 goto out_free_rule;
240
241 rule->smk_object = smk_import(data + SMK_LABELLEN, 0);
242 if (rule->smk_object == NULL)
243 goto out_free_rule;
244
245 rule->smk_access = 0;
246
247 switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
248 case '-':
249 break;
250 case 'r':
251 case 'R':
252 rule->smk_access |= MAY_READ;
253 break;
254 default:
255 goto out_free_rule;
256 }
257
258 switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
259 case '-':
260 break;
261 case 'w':
262 case 'W':
263 rule->smk_access |= MAY_WRITE;
264 break;
265 default:
266 goto out_free_rule;
267 }
268
269 switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
270 case '-':
271 break;
272 case 'x':
273 case 'X':
274 rule->smk_access |= MAY_EXEC;
275 break;
276 default:
277 goto out_free_rule;
278 }
279
280 switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
281 case '-':
282 break;
283 case 'a':
284 case 'A':
285 rule->smk_access |= MAY_APPEND;
286 break;
287 default:
288 goto out_free_rule;
289 }
290
291 switch (data[SMK_LABELLEN + SMK_LABELLEN + 4]) {
292 case '-':
293 break;
294 case 't':
295 case 'T':
296 rule->smk_access |= MAY_TRANSMUTE;
297 break;
298 default:
299 goto out_free_rule;
300 }
301
302 rc = count;
303 /*
304 * smk_set_access returns true if there was already a rule
305 * for the subject/object pair, and false if it was new.
306 */
307 if (!smk_set_access(rule, rule_list, rule_lock))
308 goto out;
309
310out_free_rule:
311 kfree(rule);
312out:
313 kfree(data);
314 return rc;
315}
316
317
318/*
319 * Seq_file read operations for /smack/load
320 */
321
322static void *load_seq_start(struct seq_file *s, loff_t *pos)
323{
324 if (*pos == SEQ_READ_FINISHED)
325 return NULL;
326 if (list_empty(&smack_rule_list))
327 return NULL;
328 return smack_rule_list.next;
329}
330
331static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
332{
333 struct list_head *list = v;
334
335 if (list_is_last(list, &smack_rule_list)) {
336 *pos = SEQ_READ_FINISHED;
337 return NULL;
338 }
339 return list->next;
340}
341
342static int load_seq_show(struct seq_file *s, void *v)
343{
344 struct list_head *list = v;
345 struct smack_rule *srp =
346 list_entry(list, struct smack_rule, list);
347
348 seq_printf(s, "%s %s", (char *)srp->smk_subject,
349 (char *)srp->smk_object);
350
351 seq_putc(s, ' ');
352
353 if (srp->smk_access & MAY_READ)
354 seq_putc(s, 'r');
355 if (srp->smk_access & MAY_WRITE)
356 seq_putc(s, 'w');
357 if (srp->smk_access & MAY_EXEC)
358 seq_putc(s, 'x');
359 if (srp->smk_access & MAY_APPEND)
360 seq_putc(s, 'a');
361 if (srp->smk_access & MAY_TRANSMUTE)
362 seq_putc(s, 't');
363 if (srp->smk_access == 0)
364 seq_putc(s, '-');
365
366 seq_putc(s, '\n');
367
368 return 0;
369}
370
371static void load_seq_stop(struct seq_file *s, void *v)
372{
373 /* No-op */
374}
375
376static const struct seq_operations load_seq_ops = {
377 .start = load_seq_start,
378 .next = load_seq_next,
379 .show = load_seq_show,
380 .stop = load_seq_stop,
381};
382
383/**
384 * smk_open_load - open() for /smack/load
385 * @inode: inode structure representing file
386 * @file: "load" file pointer
387 *
388 * For reading, use load_seq_* seq_file reading operations.
389 */
390static int smk_open_load(struct inode *inode, struct file *file)
391{
392 return seq_open(file, &load_seq_ops);
393}
394
395/**
396 * smk_write_load - write() for /smack/load
397 * @file: file pointer, not actually used
398 * @buf: where to get the data from
399 * @count: bytes sent
400 * @ppos: where to start - must be 0
401 *
402 */
403static ssize_t smk_write_load(struct file *file, const char __user *buf,
404 size_t count, loff_t *ppos)
405{
406
407 /*
408 * Must have privilege.
409 * No partial writes.
410 * Enough data must be present.
411 */
412 if (!capable(CAP_MAC_ADMIN))
413 return -EPERM;
414
415 return smk_write_load_list(file, buf, count, ppos, &smack_rule_list,
416 &smack_list_lock);
417}
418
419static const struct file_operations smk_load_ops = {
420 .open = smk_open_load,
421 .read = seq_read,
422 .llseek = seq_lseek,
423 .write = smk_write_load,
424 .release = seq_release,
425};
426
427/**
428 * smk_cipso_doi - initialize the CIPSO domain
429 */
430static void smk_cipso_doi(void)
431{
432 int rc;
433 struct cipso_v4_doi *doip;
434 struct netlbl_audit nai;
435
436 smk_netlabel_audit_set(&nai);
437
438 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
439 if (rc != 0)
440 printk(KERN_WARNING "%s:%d remove rc = %d\n",
441 __func__, __LINE__, rc);
442
443 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
444 if (doip == NULL)
445 panic("smack: Failed to initialize cipso DOI.\n");
446 doip->map.std = NULL;
447 doip->doi = smk_cipso_doi_value;
448 doip->type = CIPSO_V4_MAP_PASS;
449 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
450 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
451 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
452
453 rc = netlbl_cfg_cipsov4_add(doip, &nai);
454 if (rc != 0) {
455 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
456 __func__, __LINE__, rc);
457 kfree(doip);
458 return;
459 }
460 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
461 if (rc != 0) {
462 printk(KERN_WARNING "%s:%d map add rc = %d\n",
463 __func__, __LINE__, rc);
464 kfree(doip);
465 return;
466 }
467}
468
469/**
470 * smk_unlbl_ambient - initialize the unlabeled domain
471 * @oldambient: previous domain string
472 */
473static void smk_unlbl_ambient(char *oldambient)
474{
475 int rc;
476 struct netlbl_audit nai;
477
478 smk_netlabel_audit_set(&nai);
479
480 if (oldambient != NULL) {
481 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
482 if (rc != 0)
483 printk(KERN_WARNING "%s:%d remove rc = %d\n",
484 __func__, __LINE__, rc);
485 }
486
487 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET,
488 NULL, NULL, &nai);
489 if (rc != 0)
490 printk(KERN_WARNING "%s:%d add rc = %d\n",
491 __func__, __LINE__, rc);
492}
493
494/*
495 * Seq_file read operations for /smack/cipso
496 */
497
498static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
499{
500 if (*pos == SEQ_READ_FINISHED)
501 return NULL;
502 if (list_empty(&smack_known_list))
503 return NULL;
504
505 return smack_known_list.next;
506}
507
508static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
509{
510 struct list_head *list = v;
511
512 /*
513 * labels with no associated cipso value wont be printed
514 * in cipso_seq_show
515 */
516 if (list_is_last(list, &smack_known_list)) {
517 *pos = SEQ_READ_FINISHED;
518 return NULL;
519 }
520
521 return list->next;
522}
523
524/*
525 * Print cipso labels in format:
526 * label level[/cat[,cat]]
527 */
528static int cipso_seq_show(struct seq_file *s, void *v)
529{
530 struct list_head *list = v;
531 struct smack_known *skp =
532 list_entry(list, struct smack_known, list);
533 struct smack_cipso *scp = skp->smk_cipso;
534 char *cbp;
535 char sep = '/';
536 int cat = 1;
537 int i;
538 unsigned char m;
539
540 if (scp == NULL)
541 return 0;
542
543 seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level);
544
545 cbp = scp->smk_catset;
546 for (i = 0; i < SMK_LABELLEN; i++)
547 for (m = 0x80; m != 0; m >>= 1) {
548 if (m & cbp[i]) {
549 seq_printf(s, "%c%d", sep, cat);
550 sep = ',';
551 }
552 cat++;
553 }
554
555 seq_putc(s, '\n');
556
557 return 0;
558}
559
560static void cipso_seq_stop(struct seq_file *s, void *v)
561{
562 /* No-op */
563}
564
565static const struct seq_operations cipso_seq_ops = {
566 .start = cipso_seq_start,
567 .stop = cipso_seq_stop,
568 .next = cipso_seq_next,
569 .show = cipso_seq_show,
570};
571
572/**
573 * smk_open_cipso - open() for /smack/cipso
574 * @inode: inode structure representing file
575 * @file: "cipso" file pointer
576 *
577 * Connect our cipso_seq_* operations with /smack/cipso
578 * file_operations
579 */
580static int smk_open_cipso(struct inode *inode, struct file *file)
581{
582 return seq_open(file, &cipso_seq_ops);
583}
584
585/**
586 * smk_write_cipso - write() for /smack/cipso
587 * @file: file pointer, not actually used
588 * @buf: where to get the data from
589 * @count: bytes sent
590 * @ppos: where to start
591 *
592 * Accepts only one cipso rule per write call.
593 * Returns number of bytes written or error code, as appropriate
594 */
595static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
596 size_t count, loff_t *ppos)
597{
598 struct smack_known *skp;
599 struct smack_cipso *scp = NULL;
600 char mapcatset[SMK_LABELLEN];
601 int maplevel;
602 int cat;
603 int catlen;
604 ssize_t rc = -EINVAL;
605 char *data = NULL;
606 char *rule;
607 int ret;
608 int i;
609
610 /*
611 * Must have privilege.
612 * No partial writes.
613 * Enough data must be present.
614 */
615 if (!capable(CAP_MAC_ADMIN))
616 return -EPERM;
617 if (*ppos != 0)
618 return -EINVAL;
619 if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)
620 return -EINVAL;
621
622 data = kzalloc(count + 1, GFP_KERNEL);
623 if (data == NULL)
624 return -ENOMEM;
625
626 if (copy_from_user(data, buf, count) != 0) {
627 rc = -EFAULT;
628 goto unlockedout;
629 }
630
631 /* labels cannot begin with a '-' */
632 if (data[0] == '-') {
633 rc = -EINVAL;
634 goto unlockedout;
635 }
636 data[count] = '\0';
637 rule = data;
638 /*
639 * Only allow one writer at a time. Writes should be
640 * quite rare and small in any case.
641 */
642 mutex_lock(&smack_cipso_lock);
643
644 skp = smk_import_entry(rule, 0);
645 if (skp == NULL)
646 goto out;
647
648 rule += SMK_LABELLEN;
649 ret = sscanf(rule, "%d", &maplevel);
650 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
651 goto out;
652
653 rule += SMK_DIGITLEN;
654 ret = sscanf(rule, "%d", &catlen);
655 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
656 goto out;
657
658 if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
659 goto out;
660
661 memset(mapcatset, 0, sizeof(mapcatset));
662
663 for (i = 0; i < catlen; i++) {
664 rule += SMK_DIGITLEN;
665 ret = sscanf(rule, "%d", &cat);
666 if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
667 goto out;
668
669 smack_catset_bit(cat, mapcatset);
670 }
671
672 if (skp->smk_cipso == NULL) {
673 scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL);
674 if (scp == NULL) {
675 rc = -ENOMEM;
676 goto out;
677 }
678 }
679
680 spin_lock_bh(&skp->smk_cipsolock);
681
682 if (scp == NULL)
683 scp = skp->smk_cipso;
684 else
685 skp->smk_cipso = scp;
686
687 scp->smk_level = maplevel;
688 memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset));
689
690 spin_unlock_bh(&skp->smk_cipsolock);
691
692 rc = count;
693out:
694 mutex_unlock(&smack_cipso_lock);
695unlockedout:
696 kfree(data);
697 return rc;
698}
699
700static const struct file_operations smk_cipso_ops = {
701 .open = smk_open_cipso,
702 .read = seq_read,
703 .llseek = seq_lseek,
704 .write = smk_write_cipso,
705 .release = seq_release,
706};
707
708/*
709 * Seq_file read operations for /smack/netlabel
710 */
711
712static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
713{
714 if (*pos == SEQ_READ_FINISHED)
715 return NULL;
716 if (list_empty(&smk_netlbladdr_list))
717 return NULL;
718 return smk_netlbladdr_list.next;
719}
720
721static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
722{
723 struct list_head *list = v;
724
725 if (list_is_last(list, &smk_netlbladdr_list)) {
726 *pos = SEQ_READ_FINISHED;
727 return NULL;
728 }
729
730 return list->next;
731}
732#define BEBITS (sizeof(__be32) * 8)
733
734/*
735 * Print host/label pairs
736 */
737static int netlbladdr_seq_show(struct seq_file *s, void *v)
738{
739 struct list_head *list = v;
740 struct smk_netlbladdr *skp =
741 list_entry(list, struct smk_netlbladdr, list);
742 unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
743 int maskn;
744 u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
745
746 for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++);
747
748 seq_printf(s, "%u.%u.%u.%u/%d %s\n",
749 hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label);
750
751 return 0;
752}
753
754static void netlbladdr_seq_stop(struct seq_file *s, void *v)
755{
756 /* No-op */
757}
758
759static const struct seq_operations netlbladdr_seq_ops = {
760 .start = netlbladdr_seq_start,
761 .stop = netlbladdr_seq_stop,
762 .next = netlbladdr_seq_next,
763 .show = netlbladdr_seq_show,
764};
765
766/**
767 * smk_open_netlbladdr - open() for /smack/netlabel
768 * @inode: inode structure representing file
769 * @file: "netlabel" file pointer
770 *
771 * Connect our netlbladdr_seq_* operations with /smack/netlabel
772 * file_operations
773 */
774static int smk_open_netlbladdr(struct inode *inode, struct file *file)
775{
776 return seq_open(file, &netlbladdr_seq_ops);
777}
778
779/**
780 * smk_netlbladdr_insert
781 * @new : netlabel to insert
782 *
783 * This helper insert netlabel in the smack_netlbladdrs list
784 * sorted by netmask length (longest to smallest)
785 * locked by &smk_netlbladdr_lock in smk_write_netlbladdr
786 *
787 */
788static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
789{
790 struct smk_netlbladdr *m, *m_next;
791
792 if (list_empty(&smk_netlbladdr_list)) {
793 list_add_rcu(&new->list, &smk_netlbladdr_list);
794 return;
795 }
796
797 m = list_entry_rcu(smk_netlbladdr_list.next,
798 struct smk_netlbladdr, list);
799
800 /* the comparison '>' is a bit hacky, but works */
801 if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
802 list_add_rcu(&new->list, &smk_netlbladdr_list);
803 return;
804 }
805
806 list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
807 if (list_is_last(&m->list, &smk_netlbladdr_list)) {
808 list_add_rcu(&new->list, &m->list);
809 return;
810 }
811 m_next = list_entry_rcu(m->list.next,
812 struct smk_netlbladdr, list);
813 if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
814 list_add_rcu(&new->list, &m->list);
815 return;
816 }
817 }
818}
819
820
821/**
822 * smk_write_netlbladdr - write() for /smack/netlabel
823 * @file: file pointer, not actually used
824 * @buf: where to get the data from
825 * @count: bytes sent
826 * @ppos: where to start
827 *
828 * Accepts only one netlbladdr per write call.
829 * Returns number of bytes written or error code, as appropriate
830 */
831static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
832 size_t count, loff_t *ppos)
833{
834 struct smk_netlbladdr *skp;
835 struct sockaddr_in newname;
836 char smack[SMK_LABELLEN];
837 char *sp;
838 char data[SMK_NETLBLADDRMAX + 1];
839 char *host = (char *)&newname.sin_addr.s_addr;
840 int rc;
841 struct netlbl_audit audit_info;
842 struct in_addr mask;
843 unsigned int m;
844 int found;
845 u32 mask_bits = (1<<31);
846 __be32 nsa;
847 u32 temp_mask;
848
849 /*
850 * Must have privilege.
851 * No partial writes.
852 * Enough data must be present.
853 * "<addr/mask, as a.b.c.d/e><space><label>"
854 * "<addr, as a.b.c.d><space><label>"
855 */
856 if (!capable(CAP_MAC_ADMIN))
857 return -EPERM;
858 if (*ppos != 0)
859 return -EINVAL;
860 if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX)
861 return -EINVAL;
862 if (copy_from_user(data, buf, count) != 0)
863 return -EFAULT;
864
865 data[count] = '\0';
866
867 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
868 &host[0], &host[1], &host[2], &host[3], &m, smack);
869 if (rc != 6) {
870 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
871 &host[0], &host[1], &host[2], &host[3], smack);
872 if (rc != 5)
873 return -EINVAL;
874 m = BEBITS;
875 }
876 if (m > BEBITS)
877 return -EINVAL;
878
879 /* if smack begins with '-', its an option, don't import it */
880 if (smack[0] != '-') {
881 sp = smk_import(smack, 0);
882 if (sp == NULL)
883 return -EINVAL;
884 } else {
885 /* check known options */
886 if (strcmp(smack, smack_cipso_option) == 0)
887 sp = (char *)smack_cipso_option;
888 else
889 return -EINVAL;
890 }
891
892 for (temp_mask = 0; m > 0; m--) {
893 temp_mask |= mask_bits;
894 mask_bits >>= 1;
895 }
896 mask.s_addr = cpu_to_be32(temp_mask);
897
898 newname.sin_addr.s_addr &= mask.s_addr;
899 /*
900 * Only allow one writer at a time. Writes should be
901 * quite rare and small in any case.
902 */
903 mutex_lock(&smk_netlbladdr_lock);
904
905 nsa = newname.sin_addr.s_addr;
906 /* try to find if the prefix is already in the list */
907 found = 0;
908 list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) {
909 if (skp->smk_host.sin_addr.s_addr == nsa &&
910 skp->smk_mask.s_addr == mask.s_addr) {
911 found = 1;
912 break;
913 }
914 }
915 smk_netlabel_audit_set(&audit_info);
916
917 if (found == 0) {
918 skp = kzalloc(sizeof(*skp), GFP_KERNEL);
919 if (skp == NULL)
920 rc = -ENOMEM;
921 else {
922 rc = 0;
923 skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
924 skp->smk_mask.s_addr = mask.s_addr;
925 skp->smk_label = sp;
926 smk_netlbladdr_insert(skp);
927 }
928 } else {
929 /* we delete the unlabeled entry, only if the previous label
930 * wasn't the special CIPSO option */
931 if (skp->smk_label != smack_cipso_option)
932 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
933 &skp->smk_host.sin_addr, &skp->smk_mask,
934 PF_INET, &audit_info);
935 else
936 rc = 0;
937 skp->smk_label = sp;
938 }
939
940 /*
941 * Now tell netlabel about the single label nature of
942 * this host so that incoming packets get labeled.
943 * but only if we didn't get the special CIPSO option
944 */
945 if (rc == 0 && sp != smack_cipso_option)
946 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
947 &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
948 smack_to_secid(skp->smk_label), &audit_info);
949
950 if (rc == 0)
951 rc = count;
952
953 mutex_unlock(&smk_netlbladdr_lock);
954
955 return rc;
956}
957
958static const struct file_operations smk_netlbladdr_ops = {
959 .open = smk_open_netlbladdr,
960 .read = seq_read,
961 .llseek = seq_lseek,
962 .write = smk_write_netlbladdr,
963 .release = seq_release,
964};
965
966/**
967 * smk_read_doi - read() for /smack/doi
968 * @filp: file pointer, not actually used
969 * @buf: where to put the result
970 * @count: maximum to send along
971 * @ppos: where to start
972 *
973 * Returns number of bytes read or error code, as appropriate
974 */
975static ssize_t smk_read_doi(struct file *filp, char __user *buf,
976 size_t count, loff_t *ppos)
977{
978 char temp[80];
979 ssize_t rc;
980
981 if (*ppos != 0)
982 return 0;
983
984 sprintf(temp, "%d", smk_cipso_doi_value);
985 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
986
987 return rc;
988}
989
990/**
991 * smk_write_doi - write() for /smack/doi
992 * @file: file pointer, not actually used
993 * @buf: where to get the data from
994 * @count: bytes sent
995 * @ppos: where to start
996 *
997 * Returns number of bytes written or error code, as appropriate
998 */
999static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1000 size_t count, loff_t *ppos)
1001{
1002 char temp[80];
1003 int i;
1004
1005 if (!capable(CAP_MAC_ADMIN))
1006 return -EPERM;
1007
1008 if (count >= sizeof(temp) || count == 0)
1009 return -EINVAL;
1010
1011 if (copy_from_user(temp, buf, count) != 0)
1012 return -EFAULT;
1013
1014 temp[count] = '\0';
1015
1016 if (sscanf(temp, "%d", &i) != 1)
1017 return -EINVAL;
1018
1019 smk_cipso_doi_value = i;
1020
1021 smk_cipso_doi();
1022
1023 return count;
1024}
1025
1026static const struct file_operations smk_doi_ops = {
1027 .read = smk_read_doi,
1028 .write = smk_write_doi,
1029 .llseek = default_llseek,
1030};
1031
1032/**
1033 * smk_read_direct - read() for /smack/direct
1034 * @filp: file pointer, not actually used
1035 * @buf: where to put the result
1036 * @count: maximum to send along
1037 * @ppos: where to start
1038 *
1039 * Returns number of bytes read or error code, as appropriate
1040 */
1041static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1042 size_t count, loff_t *ppos)
1043{
1044 char temp[80];
1045 ssize_t rc;
1046
1047 if (*ppos != 0)
1048 return 0;
1049
1050 sprintf(temp, "%d", smack_cipso_direct);
1051 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1052
1053 return rc;
1054}
1055
1056/**
1057 * smk_write_direct - write() for /smack/direct
1058 * @file: file pointer, not actually used
1059 * @buf: where to get the data from
1060 * @count: bytes sent
1061 * @ppos: where to start
1062 *
1063 * Returns number of bytes written or error code, as appropriate
1064 */
1065static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1066 size_t count, loff_t *ppos)
1067{
1068 char temp[80];
1069 int i;
1070
1071 if (!capable(CAP_MAC_ADMIN))
1072 return -EPERM;
1073
1074 if (count >= sizeof(temp) || count == 0)
1075 return -EINVAL;
1076
1077 if (copy_from_user(temp, buf, count) != 0)
1078 return -EFAULT;
1079
1080 temp[count] = '\0';
1081
1082 if (sscanf(temp, "%d", &i) != 1)
1083 return -EINVAL;
1084
1085 smack_cipso_direct = i;
1086
1087 return count;
1088}
1089
1090static const struct file_operations smk_direct_ops = {
1091 .read = smk_read_direct,
1092 .write = smk_write_direct,
1093 .llseek = default_llseek,
1094};
1095
1096/**
1097 * smk_read_ambient - read() for /smack/ambient
1098 * @filp: file pointer, not actually used
1099 * @buf: where to put the result
1100 * @cn: maximum to send along
1101 * @ppos: where to start
1102 *
1103 * Returns number of bytes read or error code, as appropriate
1104 */
1105static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1106 size_t cn, loff_t *ppos)
1107{
1108 ssize_t rc;
1109 int asize;
1110
1111 if (*ppos != 0)
1112 return 0;
1113 /*
1114 * Being careful to avoid a problem in the case where
1115 * smack_net_ambient gets changed in midstream.
1116 */
1117 mutex_lock(&smack_ambient_lock);
1118
1119 asize = strlen(smack_net_ambient) + 1;
1120
1121 if (cn >= asize)
1122 rc = simple_read_from_buffer(buf, cn, ppos,
1123 smack_net_ambient, asize);
1124 else
1125 rc = -EINVAL;
1126
1127 mutex_unlock(&smack_ambient_lock);
1128
1129 return rc;
1130}
1131
1132/**
1133 * smk_write_ambient - write() for /smack/ambient
1134 * @file: file pointer, not actually used
1135 * @buf: where to get the data from
1136 * @count: bytes sent
1137 * @ppos: where to start
1138 *
1139 * Returns number of bytes written or error code, as appropriate
1140 */
1141static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1142 size_t count, loff_t *ppos)
1143{
1144 char in[SMK_LABELLEN];
1145 char *oldambient;
1146 char *smack;
1147
1148 if (!capable(CAP_MAC_ADMIN))
1149 return -EPERM;
1150
1151 if (count >= SMK_LABELLEN)
1152 return -EINVAL;
1153
1154 if (copy_from_user(in, buf, count) != 0)
1155 return -EFAULT;
1156
1157 smack = smk_import(in, count);
1158 if (smack == NULL)
1159 return -EINVAL;
1160
1161 mutex_lock(&smack_ambient_lock);
1162
1163 oldambient = smack_net_ambient;
1164 smack_net_ambient = smack;
1165 smk_unlbl_ambient(oldambient);
1166
1167 mutex_unlock(&smack_ambient_lock);
1168
1169 return count;
1170}
1171
1172static const struct file_operations smk_ambient_ops = {
1173 .read = smk_read_ambient,
1174 .write = smk_write_ambient,
1175 .llseek = default_llseek,
1176};
1177
1178/**
1179 * smk_read_onlycap - read() for /smack/onlycap
1180 * @filp: file pointer, not actually used
1181 * @buf: where to put the result
1182 * @cn: maximum to send along
1183 * @ppos: where to start
1184 *
1185 * Returns number of bytes read or error code, as appropriate
1186 */
1187static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
1188 size_t cn, loff_t *ppos)
1189{
1190 char *smack = "";
1191 ssize_t rc = -EINVAL;
1192 int asize;
1193
1194 if (*ppos != 0)
1195 return 0;
1196
1197 if (smack_onlycap != NULL)
1198 smack = smack_onlycap;
1199
1200 asize = strlen(smack) + 1;
1201
1202 if (cn >= asize)
1203 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
1204
1205 return rc;
1206}
1207
1208/**
1209 * smk_write_onlycap - write() for /smack/onlycap
1210 * @file: file pointer, not actually used
1211 * @buf: where to get the data from
1212 * @count: bytes sent
1213 * @ppos: where to start
1214 *
1215 * Returns number of bytes written or error code, as appropriate
1216 */
1217static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1218 size_t count, loff_t *ppos)
1219{
1220 char in[SMK_LABELLEN];
1221 char *sp = smk_of_task(current->cred->security);
1222
1223 if (!capable(CAP_MAC_ADMIN))
1224 return -EPERM;
1225
1226 /*
1227 * This can be done using smk_access() but is done
1228 * explicitly for clarity. The smk_access() implementation
1229 * would use smk_access(smack_onlycap, MAY_WRITE)
1230 */
1231 if (smack_onlycap != NULL && smack_onlycap != sp)
1232 return -EPERM;
1233
1234 if (count >= SMK_LABELLEN)
1235 return -EINVAL;
1236
1237 if (copy_from_user(in, buf, count) != 0)
1238 return -EFAULT;
1239
1240 /*
1241 * Should the null string be passed in unset the onlycap value.
1242 * This seems like something to be careful with as usually
1243 * smk_import only expects to return NULL for errors. It
1244 * is usually the case that a nullstring or "\n" would be
1245 * bad to pass to smk_import but in fact this is useful here.
1246 */
1247 smack_onlycap = smk_import(in, count);
1248
1249 return count;
1250}
1251
1252static const struct file_operations smk_onlycap_ops = {
1253 .read = smk_read_onlycap,
1254 .write = smk_write_onlycap,
1255 .llseek = default_llseek,
1256};
1257
1258/**
1259 * smk_read_logging - read() for /smack/logging
1260 * @filp: file pointer, not actually used
1261 * @buf: where to put the result
1262 * @cn: maximum to send along
1263 * @ppos: where to start
1264 *
1265 * Returns number of bytes read or error code, as appropriate
1266 */
1267static ssize_t smk_read_logging(struct file *filp, char __user *buf,
1268 size_t count, loff_t *ppos)
1269{
1270 char temp[32];
1271 ssize_t rc;
1272
1273 if (*ppos != 0)
1274 return 0;
1275
1276 sprintf(temp, "%d\n", log_policy);
1277 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1278 return rc;
1279}
1280
1281/**
1282 * smk_write_logging - write() for /smack/logging
1283 * @file: file pointer, not actually used
1284 * @buf: where to get the data from
1285 * @count: bytes sent
1286 * @ppos: where to start
1287 *
1288 * Returns number of bytes written or error code, as appropriate
1289 */
1290static ssize_t smk_write_logging(struct file *file, const char __user *buf,
1291 size_t count, loff_t *ppos)
1292{
1293 char temp[32];
1294 int i;
1295
1296 if (!capable(CAP_MAC_ADMIN))
1297 return -EPERM;
1298
1299 if (count >= sizeof(temp) || count == 0)
1300 return -EINVAL;
1301
1302 if (copy_from_user(temp, buf, count) != 0)
1303 return -EFAULT;
1304
1305 temp[count] = '\0';
1306
1307 if (sscanf(temp, "%d", &i) != 1)
1308 return -EINVAL;
1309 if (i < 0 || i > 3)
1310 return -EINVAL;
1311 log_policy = i;
1312 return count;
1313}
1314
1315
1316
1317static const struct file_operations smk_logging_ops = {
1318 .read = smk_read_logging,
1319 .write = smk_write_logging,
1320 .llseek = default_llseek,
1321};
1322
1323/*
1324 * Seq_file read operations for /smack/load-self
1325 */
1326
1327static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
1328{
1329 struct task_smack *tsp = current_security();
1330
1331 if (*pos == SEQ_READ_FINISHED)
1332 return NULL;
1333 if (list_empty(&tsp->smk_rules))
1334 return NULL;
1335 return tsp->smk_rules.next;
1336}
1337
1338static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
1339{
1340 struct task_smack *tsp = current_security();
1341 struct list_head *list = v;
1342
1343 if (list_is_last(list, &tsp->smk_rules)) {
1344 *pos = SEQ_READ_FINISHED;
1345 return NULL;
1346 }
1347 return list->next;
1348}
1349
1350static int load_self_seq_show(struct seq_file *s, void *v)
1351{
1352 struct list_head *list = v;
1353 struct smack_rule *srp =
1354 list_entry(list, struct smack_rule, list);
1355
1356 seq_printf(s, "%s %s", (char *)srp->smk_subject,
1357 (char *)srp->smk_object);
1358
1359 seq_putc(s, ' ');
1360
1361 if (srp->smk_access & MAY_READ)
1362 seq_putc(s, 'r');
1363 if (srp->smk_access & MAY_WRITE)
1364 seq_putc(s, 'w');
1365 if (srp->smk_access & MAY_EXEC)
1366 seq_putc(s, 'x');
1367 if (srp->smk_access & MAY_APPEND)
1368 seq_putc(s, 'a');
1369 if (srp->smk_access & MAY_TRANSMUTE)
1370 seq_putc(s, 't');
1371 if (srp->smk_access == 0)
1372 seq_putc(s, '-');
1373
1374 seq_putc(s, '\n');
1375
1376 return 0;
1377}
1378
1379static void load_self_seq_stop(struct seq_file *s, void *v)
1380{
1381 /* No-op */
1382}
1383
1384static const struct seq_operations load_self_seq_ops = {
1385 .start = load_self_seq_start,
1386 .next = load_self_seq_next,
1387 .show = load_self_seq_show,
1388 .stop = load_self_seq_stop,
1389};
1390
1391
1392/**
1393 * smk_open_load_self - open() for /smack/load-self
1394 * @inode: inode structure representing file
1395 * @file: "load" file pointer
1396 *
1397 * For reading, use load_seq_* seq_file reading operations.
1398 */
1399static int smk_open_load_self(struct inode *inode, struct file *file)
1400{
1401 return seq_open(file, &load_self_seq_ops);
1402}
1403
1404/**
1405 * smk_write_load_self - write() for /smack/load-self
1406 * @file: file pointer, not actually used
1407 * @buf: where to get the data from
1408 * @count: bytes sent
1409 * @ppos: where to start - must be 0
1410 *
1411 */
1412static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
1413 size_t count, loff_t *ppos)
1414{
1415 struct task_smack *tsp = current_security();
1416
1417 return smk_write_load_list(file, buf, count, ppos, &tsp->smk_rules,
1418 &tsp->smk_rules_lock);
1419}
1420
1421static const struct file_operations smk_load_self_ops = {
1422 .open = smk_open_load_self,
1423 .read = seq_read,
1424 .llseek = seq_lseek,
1425 .write = smk_write_load_self,
1426 .release = seq_release,
1427};
1428/**
1429 * smk_fill_super - fill the /smackfs superblock
1430 * @sb: the empty superblock
1431 * @data: unused
1432 * @silent: unused
1433 *
1434 * Fill in the well known entries for /smack
1435 *
1436 * Returns 0 on success, an error code on failure
1437 */
1438static int smk_fill_super(struct super_block *sb, void *data, int silent)
1439{
1440 int rc;
1441 struct inode *root_inode;
1442
1443 static struct tree_descr smack_files[] = {
1444 [SMK_LOAD] = {
1445 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
1446 [SMK_CIPSO] = {
1447 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
1448 [SMK_DOI] = {
1449 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
1450 [SMK_DIRECT] = {
1451 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
1452 [SMK_AMBIENT] = {
1453 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
1454 [SMK_NETLBLADDR] = {
1455 "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
1456 [SMK_ONLYCAP] = {
1457 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
1458 [SMK_LOGGING] = {
1459 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
1460 [SMK_LOAD_SELF] = {
1461 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
1462 /* last one */
1463 {""}
1464 };
1465
1466 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
1467 if (rc != 0) {
1468 printk(KERN_ERR "%s failed %d while creating inodes\n",
1469 __func__, rc);
1470 return rc;
1471 }
1472
1473 root_inode = sb->s_root->d_inode;
1474 root_inode->i_security = new_inode_smack(smack_known_floor.smk_known);
1475
1476 return 0;
1477}
1478
1479/**
1480 * smk_mount - get the smackfs superblock
1481 * @fs_type: passed along without comment
1482 * @flags: passed along without comment
1483 * @dev_name: passed along without comment
1484 * @data: passed along without comment
1485 *
1486 * Just passes everything along.
1487 *
1488 * Returns what the lower level code does.
1489 */
1490static struct dentry *smk_mount(struct file_system_type *fs_type,
1491 int flags, const char *dev_name, void *data)
1492{
1493 return mount_single(fs_type, flags, data, smk_fill_super);
1494}
1495
1496static struct file_system_type smk_fs_type = {
1497 .name = "smackfs",
1498 .mount = smk_mount,
1499 .kill_sb = kill_litter_super,
1500};
1501
1502static struct vfsmount *smackfs_mount;
1503
1504/**
1505 * init_smk_fs - get the smackfs superblock
1506 *
1507 * register the smackfs
1508 *
1509 * Do not register smackfs if Smack wasn't enabled
1510 * on boot. We can not put this method normally under the
1511 * smack_init() code path since the security subsystem get
1512 * initialized before the vfs caches.
1513 *
1514 * Returns true if we were not chosen on boot or if
1515 * we were chosen and filesystem registration succeeded.
1516 */
1517static int __init init_smk_fs(void)
1518{
1519 int err;
1520
1521 if (!security_module_enable(&smack_ops))
1522 return 0;
1523
1524 err = register_filesystem(&smk_fs_type);
1525 if (!err) {
1526 smackfs_mount = kern_mount(&smk_fs_type);
1527 if (IS_ERR(smackfs_mount)) {
1528 printk(KERN_ERR "smackfs: could not mount!\n");
1529 err = PTR_ERR(smackfs_mount);
1530 smackfs_mount = NULL;
1531 }
1532 }
1533
1534 smk_cipso_doi();
1535 smk_unlbl_ambient(NULL);
1536
1537 return err;
1538}
1539
1540__initcall(init_smk_fs);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
4 *
5 * Authors:
6 * Casey Schaufler <casey@schaufler-ca.com>
7 * Ahmed S. Darwish <darwish.07@gmail.com>
8 *
9 * Special thanks to the authors of selinuxfs.
10 *
11 * Karl MacMillan <kmacmillan@tresys.com>
12 * James Morris <jmorris@redhat.com>
13 */
14
15#include <linux/kernel.h>
16#include <linux/vmalloc.h>
17#include <linux/security.h>
18#include <linux/mutex.h>
19#include <linux/slab.h>
20#include <net/net_namespace.h>
21#include <net/cipso_ipv4.h>
22#include <linux/seq_file.h>
23#include <linux/ctype.h>
24#include <linux/audit.h>
25#include <linux/magic.h>
26#include <linux/fs_context.h>
27#include "smack.h"
28
29#define BEBITS (sizeof(__be32) * 8)
30/*
31 * smackfs pseudo filesystem.
32 */
33
34enum smk_inos {
35 SMK_ROOT_INO = 2,
36 SMK_LOAD = 3, /* load policy */
37 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
38 SMK_DOI = 5, /* CIPSO DOI */
39 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
40 SMK_AMBIENT = 7, /* internet ambient label */
41 SMK_NET4ADDR = 8, /* single label hosts */
42 SMK_ONLYCAP = 9, /* the only "capable" label */
43 SMK_LOGGING = 10, /* logging */
44 SMK_LOAD_SELF = 11, /* task specific rules */
45 SMK_ACCESSES = 12, /* access policy */
46 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
47 SMK_LOAD2 = 14, /* load policy with long labels */
48 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
49 SMK_ACCESS2 = 16, /* make an access check with long labels */
50 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
51 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
52 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
53 SMK_SYSLOG = 20, /* change syslog label) */
54 SMK_PTRACE = 21, /* set ptrace rule */
55#ifdef CONFIG_SECURITY_SMACK_BRINGUP
56 SMK_UNCONFINED = 22, /* define an unconfined label */
57#endif
58#if IS_ENABLED(CONFIG_IPV6)
59 SMK_NET6ADDR = 23, /* single label IPv6 hosts */
60#endif /* CONFIG_IPV6 */
61 SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
62};
63
64/*
65 * List locks
66 */
67static DEFINE_MUTEX(smack_cipso_lock);
68static DEFINE_MUTEX(smack_ambient_lock);
69static DEFINE_MUTEX(smk_net4addr_lock);
70#if IS_ENABLED(CONFIG_IPV6)
71static DEFINE_MUTEX(smk_net6addr_lock);
72#endif /* CONFIG_IPV6 */
73
74/*
75 * This is the "ambient" label for network traffic.
76 * If it isn't somehow marked, use this.
77 * It can be reset via smackfs/ambient
78 */
79struct smack_known *smack_net_ambient;
80
81/*
82 * This is the level in a CIPSO header that indicates a
83 * smack label is contained directly in the category set.
84 * It can be reset via smackfs/direct
85 */
86int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
87
88/*
89 * This is the level in a CIPSO header that indicates a
90 * secid is contained directly in the category set.
91 * It can be reset via smackfs/mapped
92 */
93int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
94
95#ifdef CONFIG_SECURITY_SMACK_BRINGUP
96/*
97 * Allow one label to be unconfined. This is for
98 * debugging and application bring-up purposes only.
99 * It is bad and wrong, but everyone seems to expect
100 * to have it.
101 */
102struct smack_known *smack_unconfined;
103#endif
104
105/*
106 * If this value is set restrict syslog use to the label specified.
107 * It can be reset via smackfs/syslog
108 */
109struct smack_known *smack_syslog_label;
110
111/*
112 * Ptrace current rule
113 * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
114 * SMACK_PTRACE_EXACT labels must match, but can be overriden with
115 * CAP_SYS_PTRACE
116 * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect
117 */
118int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
119
120/*
121 * Certain IP addresses may be designated as single label hosts.
122 * Packets are sent there unlabeled, but only from tasks that
123 * can write to the specified label.
124 */
125
126LIST_HEAD(smk_net4addr_list);
127#if IS_ENABLED(CONFIG_IPV6)
128LIST_HEAD(smk_net6addr_list);
129#endif /* CONFIG_IPV6 */
130
131/*
132 * Rule lists are maintained for each label.
133 */
134struct smack_parsed_rule {
135 struct smack_known *smk_subject;
136 struct smack_known *smk_object;
137 int smk_access1;
138 int smk_access2;
139};
140
141static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
142
143/*
144 * Values for parsing cipso rules
145 * SMK_DIGITLEN: Length of a digit field in a rule.
146 * SMK_CIPSOMIN: Minimum possible cipso rule length.
147 * SMK_CIPSOMAX: Maximum possible cipso rule length.
148 */
149#define SMK_DIGITLEN 4
150#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
151#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
152
153/*
154 * Values for parsing MAC rules
155 * SMK_ACCESS: Maximum possible combination of access permissions
156 * SMK_ACCESSLEN: Maximum length for a rule access field
157 * SMK_LOADLEN: Smack rule length
158 */
159#define SMK_OACCESS "rwxa"
160#define SMK_ACCESS "rwxatl"
161#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
162#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
163#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
164#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
165
166/*
167 * Stricly for CIPSO level manipulation.
168 * Set the category bit number in a smack label sized buffer.
169 */
170static inline void smack_catset_bit(unsigned int cat, char *catsetp)
171{
172 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
173 return;
174
175 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
176}
177
178/**
179 * smk_netlabel_audit_set - fill a netlbl_audit struct
180 * @nap: structure to fill
181 */
182static void smk_netlabel_audit_set(struct netlbl_audit *nap)
183{
184 struct smack_known *skp = smk_of_current();
185
186 nap->loginuid = audit_get_loginuid(current);
187 nap->sessionid = audit_get_sessionid(current);
188 nap->secid = skp->smk_secid;
189}
190
191/*
192 * Value for parsing single label host rules
193 * "1.2.3.4 X"
194 */
195#define SMK_NETLBLADDRMIN 9
196
197/**
198 * smk_set_access - add a rule to the rule list or replace an old rule
199 * @srp: the rule to add or replace
200 * @rule_list: the list of rules
201 * @rule_lock: the rule list lock
202 *
203 * Looks through the current subject/object/access list for
204 * the subject/object pair and replaces the access that was
205 * there. If the pair isn't found add it with the specified
206 * access.
207 *
208 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
209 * during the allocation of the new pair to add.
210 */
211static int smk_set_access(struct smack_parsed_rule *srp,
212 struct list_head *rule_list,
213 struct mutex *rule_lock)
214{
215 struct smack_rule *sp;
216 int found = 0;
217 int rc = 0;
218
219 mutex_lock(rule_lock);
220
221 /*
222 * Because the object label is less likely to match
223 * than the subject label check it first
224 */
225 list_for_each_entry_rcu(sp, rule_list, list) {
226 if (sp->smk_object == srp->smk_object &&
227 sp->smk_subject == srp->smk_subject) {
228 found = 1;
229 sp->smk_access |= srp->smk_access1;
230 sp->smk_access &= ~srp->smk_access2;
231 break;
232 }
233 }
234
235 if (found == 0) {
236 sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL);
237 if (sp == NULL) {
238 rc = -ENOMEM;
239 goto out;
240 }
241
242 sp->smk_subject = srp->smk_subject;
243 sp->smk_object = srp->smk_object;
244 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
245
246 list_add_rcu(&sp->list, rule_list);
247 }
248
249out:
250 mutex_unlock(rule_lock);
251 return rc;
252}
253
254/**
255 * smk_perm_from_str - parse smack accesses from a text string
256 * @string: a text string that contains a Smack accesses code
257 *
258 * Returns an integer with respective bits set for specified accesses.
259 */
260static int smk_perm_from_str(const char *string)
261{
262 int perm = 0;
263 const char *cp;
264
265 for (cp = string; ; cp++)
266 switch (*cp) {
267 case '-':
268 break;
269 case 'r':
270 case 'R':
271 perm |= MAY_READ;
272 break;
273 case 'w':
274 case 'W':
275 perm |= MAY_WRITE;
276 break;
277 case 'x':
278 case 'X':
279 perm |= MAY_EXEC;
280 break;
281 case 'a':
282 case 'A':
283 perm |= MAY_APPEND;
284 break;
285 case 't':
286 case 'T':
287 perm |= MAY_TRANSMUTE;
288 break;
289 case 'l':
290 case 'L':
291 perm |= MAY_LOCK;
292 break;
293 case 'b':
294 case 'B':
295 perm |= MAY_BRINGUP;
296 break;
297 default:
298 return perm;
299 }
300}
301
302/**
303 * smk_fill_rule - Fill Smack rule from strings
304 * @subject: subject label string
305 * @object: object label string
306 * @access1: access string
307 * @access2: string with permissions to be removed
308 * @rule: Smack rule
309 * @import: if non-zero, import labels
310 * @len: label length limit
311 *
312 * Returns 0 on success, appropriate error code on failure.
313 */
314static int smk_fill_rule(const char *subject, const char *object,
315 const char *access1, const char *access2,
316 struct smack_parsed_rule *rule, int import,
317 int len)
318{
319 const char *cp;
320 struct smack_known *skp;
321
322 if (import) {
323 rule->smk_subject = smk_import_entry(subject, len);
324 if (IS_ERR(rule->smk_subject))
325 return PTR_ERR(rule->smk_subject);
326
327 rule->smk_object = smk_import_entry(object, len);
328 if (IS_ERR(rule->smk_object))
329 return PTR_ERR(rule->smk_object);
330 } else {
331 cp = smk_parse_smack(subject, len);
332 if (IS_ERR(cp))
333 return PTR_ERR(cp);
334 skp = smk_find_entry(cp);
335 kfree(cp);
336 if (skp == NULL)
337 return -ENOENT;
338 rule->smk_subject = skp;
339
340 cp = smk_parse_smack(object, len);
341 if (IS_ERR(cp))
342 return PTR_ERR(cp);
343 skp = smk_find_entry(cp);
344 kfree(cp);
345 if (skp == NULL)
346 return -ENOENT;
347 rule->smk_object = skp;
348 }
349
350 rule->smk_access1 = smk_perm_from_str(access1);
351 if (access2)
352 rule->smk_access2 = smk_perm_from_str(access2);
353 else
354 rule->smk_access2 = ~rule->smk_access1;
355
356 return 0;
357}
358
359/**
360 * smk_parse_rule - parse Smack rule from load string
361 * @data: string to be parsed whose size is SMK_LOADLEN
362 * @rule: Smack rule
363 * @import: if non-zero, import labels
364 *
365 * Returns 0 on success, -1 on errors.
366 */
367static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
368 int import)
369{
370 int rc;
371
372 rc = smk_fill_rule(data, data + SMK_LABELLEN,
373 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
374 import, SMK_LABELLEN);
375 return rc;
376}
377
378/**
379 * smk_parse_long_rule - parse Smack rule from rule string
380 * @data: string to be parsed, null terminated
381 * @rule: Will be filled with Smack parsed rule
382 * @import: if non-zero, import labels
383 * @tokens: number of substrings expected in data
384 *
385 * Returns number of processed bytes on success, -ERRNO on failure.
386 */
387static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
388 int import, int tokens)
389{
390 ssize_t cnt = 0;
391 char *tok[4];
392 int rc;
393 int i;
394
395 /*
396 * Parsing the rule in-place, filling all white-spaces with '\0'
397 */
398 for (i = 0; i < tokens; ++i) {
399 while (isspace(data[cnt]))
400 data[cnt++] = '\0';
401
402 if (data[cnt] == '\0')
403 /* Unexpected end of data */
404 return -EINVAL;
405
406 tok[i] = data + cnt;
407
408 while (data[cnt] && !isspace(data[cnt]))
409 ++cnt;
410 }
411 while (isspace(data[cnt]))
412 data[cnt++] = '\0';
413
414 while (i < 4)
415 tok[i++] = NULL;
416
417 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
418 return rc == 0 ? cnt : rc;
419}
420
421#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
422#define SMK_LONG_FMT 1 /* Variable long label format */
423#define SMK_CHANGE_FMT 2 /* Rule modification format */
424/**
425 * smk_write_rules_list - write() for any /smack rule file
426 * @file: file pointer, not actually used
427 * @buf: where to get the data from
428 * @count: bytes sent
429 * @ppos: where to start - must be 0
430 * @rule_list: the list of rules to write to
431 * @rule_lock: lock for the rule list
432 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
433 *
434 * Get one smack access rule from above.
435 * The format for SMK_LONG_FMT is:
436 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
437 * The format for SMK_FIXED24_FMT is exactly:
438 * "subject object rwxat"
439 * The format for SMK_CHANGE_FMT is:
440 * "subject<whitespace>object<whitespace>
441 * acc_enable<whitespace>acc_disable[<whitespace>...]"
442 */
443static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
444 size_t count, loff_t *ppos,
445 struct list_head *rule_list,
446 struct mutex *rule_lock, int format)
447{
448 struct smack_parsed_rule rule;
449 char *data;
450 int rc;
451 int trunc = 0;
452 int tokens;
453 ssize_t cnt = 0;
454
455 /*
456 * No partial writes.
457 * Enough data must be present.
458 */
459 if (*ppos != 0)
460 return -EINVAL;
461
462 if (format == SMK_FIXED24_FMT) {
463 /*
464 * Minor hack for backward compatibility
465 */
466 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
467 return -EINVAL;
468 } else {
469 if (count >= PAGE_SIZE) {
470 count = PAGE_SIZE - 1;
471 trunc = 1;
472 }
473 }
474
475 data = memdup_user_nul(buf, count);
476 if (IS_ERR(data))
477 return PTR_ERR(data);
478
479 /*
480 * In case of parsing only part of user buf,
481 * avoid having partial rule at the data buffer
482 */
483 if (trunc) {
484 while (count > 0 && (data[count - 1] != '\n'))
485 --count;
486 if (count == 0) {
487 rc = -EINVAL;
488 goto out;
489 }
490 }
491
492 data[count] = '\0';
493 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
494 while (cnt < count) {
495 if (format == SMK_FIXED24_FMT) {
496 rc = smk_parse_rule(data, &rule, 1);
497 if (rc < 0)
498 goto out;
499 cnt = count;
500 } else {
501 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
502 if (rc < 0)
503 goto out;
504 if (rc == 0) {
505 rc = -EINVAL;
506 goto out;
507 }
508 cnt += rc;
509 }
510
511 if (rule_list == NULL)
512 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
513 &rule.smk_subject->smk_rules_lock);
514 else
515 rc = smk_set_access(&rule, rule_list, rule_lock);
516
517 if (rc)
518 goto out;
519 }
520
521 rc = cnt;
522out:
523 kfree(data);
524 return rc;
525}
526
527/*
528 * Core logic for smackfs seq list operations.
529 */
530
531static void *smk_seq_start(struct seq_file *s, loff_t *pos,
532 struct list_head *head)
533{
534 struct list_head *list;
535 int i = *pos;
536
537 rcu_read_lock();
538 for (list = rcu_dereference(list_next_rcu(head));
539 list != head;
540 list = rcu_dereference(list_next_rcu(list))) {
541 if (i-- == 0)
542 return list;
543 }
544
545 return NULL;
546}
547
548static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
549 struct list_head *head)
550{
551 struct list_head *list = v;
552
553 ++*pos;
554 list = rcu_dereference(list_next_rcu(list));
555
556 return (list == head) ? NULL : list;
557}
558
559static void smk_seq_stop(struct seq_file *s, void *v)
560{
561 rcu_read_unlock();
562}
563
564static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
565{
566 /*
567 * Don't show any rules with label names too long for
568 * interface file (/smack/load or /smack/load2)
569 * because you should expect to be able to write
570 * anything you read back.
571 */
572 if (strlen(srp->smk_subject->smk_known) >= max ||
573 strlen(srp->smk_object->smk_known) >= max)
574 return;
575
576 if (srp->smk_access == 0)
577 return;
578
579 seq_printf(s, "%s %s",
580 srp->smk_subject->smk_known,
581 srp->smk_object->smk_known);
582
583 seq_putc(s, ' ');
584
585 if (srp->smk_access & MAY_READ)
586 seq_putc(s, 'r');
587 if (srp->smk_access & MAY_WRITE)
588 seq_putc(s, 'w');
589 if (srp->smk_access & MAY_EXEC)
590 seq_putc(s, 'x');
591 if (srp->smk_access & MAY_APPEND)
592 seq_putc(s, 'a');
593 if (srp->smk_access & MAY_TRANSMUTE)
594 seq_putc(s, 't');
595 if (srp->smk_access & MAY_LOCK)
596 seq_putc(s, 'l');
597 if (srp->smk_access & MAY_BRINGUP)
598 seq_putc(s, 'b');
599
600 seq_putc(s, '\n');
601}
602
603/*
604 * Seq_file read operations for /smack/load
605 */
606
607static void *load2_seq_start(struct seq_file *s, loff_t *pos)
608{
609 return smk_seq_start(s, pos, &smack_known_list);
610}
611
612static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
613{
614 return smk_seq_next(s, v, pos, &smack_known_list);
615}
616
617static int load_seq_show(struct seq_file *s, void *v)
618{
619 struct list_head *list = v;
620 struct smack_rule *srp;
621 struct smack_known *skp =
622 list_entry_rcu(list, struct smack_known, list);
623
624 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
625 smk_rule_show(s, srp, SMK_LABELLEN);
626
627 return 0;
628}
629
630static const struct seq_operations load_seq_ops = {
631 .start = load2_seq_start,
632 .next = load2_seq_next,
633 .show = load_seq_show,
634 .stop = smk_seq_stop,
635};
636
637/**
638 * smk_open_load - open() for /smack/load
639 * @inode: inode structure representing file
640 * @file: "load" file pointer
641 *
642 * For reading, use load_seq_* seq_file reading operations.
643 */
644static int smk_open_load(struct inode *inode, struct file *file)
645{
646 return seq_open(file, &load_seq_ops);
647}
648
649/**
650 * smk_write_load - write() for /smack/load
651 * @file: file pointer, not actually used
652 * @buf: where to get the data from
653 * @count: bytes sent
654 * @ppos: where to start - must be 0
655 *
656 */
657static ssize_t smk_write_load(struct file *file, const char __user *buf,
658 size_t count, loff_t *ppos)
659{
660 /*
661 * Must have privilege.
662 * No partial writes.
663 * Enough data must be present.
664 */
665 if (!smack_privileged(CAP_MAC_ADMIN))
666 return -EPERM;
667
668 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
669 SMK_FIXED24_FMT);
670}
671
672static const struct file_operations smk_load_ops = {
673 .open = smk_open_load,
674 .read = seq_read,
675 .llseek = seq_lseek,
676 .write = smk_write_load,
677 .release = seq_release,
678};
679
680/**
681 * smk_cipso_doi - initialize the CIPSO domain
682 */
683static void smk_cipso_doi(void)
684{
685 int rc;
686 struct cipso_v4_doi *doip;
687 struct netlbl_audit nai;
688
689 smk_netlabel_audit_set(&nai);
690
691 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
692 if (rc != 0)
693 printk(KERN_WARNING "%s:%d remove rc = %d\n",
694 __func__, __LINE__, rc);
695
696 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
697 if (doip == NULL)
698 panic("smack: Failed to initialize cipso DOI.\n");
699 doip->map.std = NULL;
700 doip->doi = smk_cipso_doi_value;
701 doip->type = CIPSO_V4_MAP_PASS;
702 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
703 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
704 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
705
706 rc = netlbl_cfg_cipsov4_add(doip, &nai);
707 if (rc != 0) {
708 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
709 __func__, __LINE__, rc);
710 kfree(doip);
711 return;
712 }
713 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
714 if (rc != 0) {
715 printk(KERN_WARNING "%s:%d map add rc = %d\n",
716 __func__, __LINE__, rc);
717 kfree(doip);
718 return;
719 }
720}
721
722/**
723 * smk_unlbl_ambient - initialize the unlabeled domain
724 * @oldambient: previous domain string
725 */
726static void smk_unlbl_ambient(char *oldambient)
727{
728 int rc;
729 struct netlbl_audit nai;
730
731 smk_netlabel_audit_set(&nai);
732
733 if (oldambient != NULL) {
734 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
735 if (rc != 0)
736 printk(KERN_WARNING "%s:%d remove rc = %d\n",
737 __func__, __LINE__, rc);
738 }
739 if (smack_net_ambient == NULL)
740 smack_net_ambient = &smack_known_floor;
741
742 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
743 NULL, NULL, &nai);
744 if (rc != 0)
745 printk(KERN_WARNING "%s:%d add rc = %d\n",
746 __func__, __LINE__, rc);
747}
748
749/*
750 * Seq_file read operations for /smack/cipso
751 */
752
753static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
754{
755 return smk_seq_start(s, pos, &smack_known_list);
756}
757
758static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
759{
760 return smk_seq_next(s, v, pos, &smack_known_list);
761}
762
763/*
764 * Print cipso labels in format:
765 * label level[/cat[,cat]]
766 */
767static int cipso_seq_show(struct seq_file *s, void *v)
768{
769 struct list_head *list = v;
770 struct smack_known *skp =
771 list_entry_rcu(list, struct smack_known, list);
772 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
773 char sep = '/';
774 int i;
775
776 /*
777 * Don't show a label that could not have been set using
778 * /smack/cipso. This is in support of the notion that
779 * anything read from /smack/cipso ought to be writeable
780 * to /smack/cipso.
781 *
782 * /smack/cipso2 should be used instead.
783 */
784 if (strlen(skp->smk_known) >= SMK_LABELLEN)
785 return 0;
786
787 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
788
789 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
790 i = netlbl_catmap_walk(cmp, i + 1)) {
791 seq_printf(s, "%c%d", sep, i);
792 sep = ',';
793 }
794
795 seq_putc(s, '\n');
796
797 return 0;
798}
799
800static const struct seq_operations cipso_seq_ops = {
801 .start = cipso_seq_start,
802 .next = cipso_seq_next,
803 .show = cipso_seq_show,
804 .stop = smk_seq_stop,
805};
806
807/**
808 * smk_open_cipso - open() for /smack/cipso
809 * @inode: inode structure representing file
810 * @file: "cipso" file pointer
811 *
812 * Connect our cipso_seq_* operations with /smack/cipso
813 * file_operations
814 */
815static int smk_open_cipso(struct inode *inode, struct file *file)
816{
817 return seq_open(file, &cipso_seq_ops);
818}
819
820/**
821 * smk_set_cipso - do the work for write() for cipso and cipso2
822 * @file: file pointer, not actually used
823 * @buf: where to get the data from
824 * @count: bytes sent
825 * @ppos: where to start
826 * @format: /smack/cipso or /smack/cipso2
827 *
828 * Accepts only one cipso rule per write call.
829 * Returns number of bytes written or error code, as appropriate
830 */
831static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
832 size_t count, loff_t *ppos, int format)
833{
834 struct smack_known *skp;
835 struct netlbl_lsm_secattr ncats;
836 char mapcatset[SMK_CIPSOLEN];
837 int maplevel;
838 unsigned int cat;
839 int catlen;
840 ssize_t rc = -EINVAL;
841 char *data = NULL;
842 char *rule;
843 int ret;
844 int i;
845
846 /*
847 * Must have privilege.
848 * No partial writes.
849 * Enough data must be present.
850 */
851 if (!smack_privileged(CAP_MAC_ADMIN))
852 return -EPERM;
853 if (*ppos != 0)
854 return -EINVAL;
855 if (format == SMK_FIXED24_FMT &&
856 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
857 return -EINVAL;
858 if (count > PAGE_SIZE)
859 return -EINVAL;
860
861 data = memdup_user_nul(buf, count);
862 if (IS_ERR(data))
863 return PTR_ERR(data);
864
865 rule = data;
866 /*
867 * Only allow one writer at a time. Writes should be
868 * quite rare and small in any case.
869 */
870 mutex_lock(&smack_cipso_lock);
871
872 skp = smk_import_entry(rule, 0);
873 if (IS_ERR(skp)) {
874 rc = PTR_ERR(skp);
875 goto out;
876 }
877
878 if (format == SMK_FIXED24_FMT)
879 rule += SMK_LABELLEN;
880 else
881 rule += strlen(skp->smk_known) + 1;
882
883 if (rule > data + count) {
884 rc = -EOVERFLOW;
885 goto out;
886 }
887
888 ret = sscanf(rule, "%d", &maplevel);
889 if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL)
890 goto out;
891
892 rule += SMK_DIGITLEN;
893 if (rule > data + count) {
894 rc = -EOVERFLOW;
895 goto out;
896 }
897
898 ret = sscanf(rule, "%d", &catlen);
899 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
900 goto out;
901
902 if (format == SMK_FIXED24_FMT &&
903 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
904 goto out;
905
906 memset(mapcatset, 0, sizeof(mapcatset));
907
908 for (i = 0; i < catlen; i++) {
909 rule += SMK_DIGITLEN;
910 if (rule > data + count) {
911 rc = -EOVERFLOW;
912 goto out;
913 }
914 ret = sscanf(rule, "%u", &cat);
915 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
916 goto out;
917
918 smack_catset_bit(cat, mapcatset);
919 }
920
921 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
922 if (rc >= 0) {
923 netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat);
924 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
925 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
926 rc = count;
927 /*
928 * This mapping may have been cached, so clear the cache.
929 */
930 netlbl_cache_invalidate();
931 }
932
933out:
934 mutex_unlock(&smack_cipso_lock);
935 kfree(data);
936 return rc;
937}
938
939/**
940 * smk_write_cipso - write() for /smack/cipso
941 * @file: file pointer, not actually used
942 * @buf: where to get the data from
943 * @count: bytes sent
944 * @ppos: where to start
945 *
946 * Accepts only one cipso rule per write call.
947 * Returns number of bytes written or error code, as appropriate
948 */
949static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
950 size_t count, loff_t *ppos)
951{
952 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
953}
954
955static const struct file_operations smk_cipso_ops = {
956 .open = smk_open_cipso,
957 .read = seq_read,
958 .llseek = seq_lseek,
959 .write = smk_write_cipso,
960 .release = seq_release,
961};
962
963/*
964 * Seq_file read operations for /smack/cipso2
965 */
966
967/*
968 * Print cipso labels in format:
969 * label level[/cat[,cat]]
970 */
971static int cipso2_seq_show(struct seq_file *s, void *v)
972{
973 struct list_head *list = v;
974 struct smack_known *skp =
975 list_entry_rcu(list, struct smack_known, list);
976 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
977 char sep = '/';
978 int i;
979
980 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
981
982 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
983 i = netlbl_catmap_walk(cmp, i + 1)) {
984 seq_printf(s, "%c%d", sep, i);
985 sep = ',';
986 }
987
988 seq_putc(s, '\n');
989
990 return 0;
991}
992
993static const struct seq_operations cipso2_seq_ops = {
994 .start = cipso_seq_start,
995 .next = cipso_seq_next,
996 .show = cipso2_seq_show,
997 .stop = smk_seq_stop,
998};
999
1000/**
1001 * smk_open_cipso2 - open() for /smack/cipso2
1002 * @inode: inode structure representing file
1003 * @file: "cipso2" file pointer
1004 *
1005 * Connect our cipso_seq_* operations with /smack/cipso2
1006 * file_operations
1007 */
1008static int smk_open_cipso2(struct inode *inode, struct file *file)
1009{
1010 return seq_open(file, &cipso2_seq_ops);
1011}
1012
1013/**
1014 * smk_write_cipso2 - write() for /smack/cipso2
1015 * @file: file pointer, not actually used
1016 * @buf: where to get the data from
1017 * @count: bytes sent
1018 * @ppos: where to start
1019 *
1020 * Accepts only one cipso rule per write call.
1021 * Returns number of bytes written or error code, as appropriate
1022 */
1023static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1024 size_t count, loff_t *ppos)
1025{
1026 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1027}
1028
1029static const struct file_operations smk_cipso2_ops = {
1030 .open = smk_open_cipso2,
1031 .read = seq_read,
1032 .llseek = seq_lseek,
1033 .write = smk_write_cipso2,
1034 .release = seq_release,
1035};
1036
1037/*
1038 * Seq_file read operations for /smack/netlabel
1039 */
1040
1041static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1042{
1043 return smk_seq_start(s, pos, &smk_net4addr_list);
1044}
1045
1046static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1047{
1048 return smk_seq_next(s, v, pos, &smk_net4addr_list);
1049}
1050
1051/*
1052 * Print host/label pairs
1053 */
1054static int net4addr_seq_show(struct seq_file *s, void *v)
1055{
1056 struct list_head *list = v;
1057 struct smk_net4addr *skp =
1058 list_entry_rcu(list, struct smk_net4addr, list);
1059 char *kp = SMACK_CIPSO_OPTION;
1060
1061 if (skp->smk_label != NULL)
1062 kp = skp->smk_label->smk_known;
1063 seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1064 skp->smk_masks, kp);
1065
1066 return 0;
1067}
1068
1069static const struct seq_operations net4addr_seq_ops = {
1070 .start = net4addr_seq_start,
1071 .next = net4addr_seq_next,
1072 .show = net4addr_seq_show,
1073 .stop = smk_seq_stop,
1074};
1075
1076/**
1077 * smk_open_net4addr - open() for /smack/netlabel
1078 * @inode: inode structure representing file
1079 * @file: "netlabel" file pointer
1080 *
1081 * Connect our net4addr_seq_* operations with /smack/netlabel
1082 * file_operations
1083 */
1084static int smk_open_net4addr(struct inode *inode, struct file *file)
1085{
1086 return seq_open(file, &net4addr_seq_ops);
1087}
1088
1089/**
1090 * smk_net4addr_insert
1091 * @new : netlabel to insert
1092 *
1093 * This helper insert netlabel in the smack_net4addrs list
1094 * sorted by netmask length (longest to smallest)
1095 * locked by &smk_net4addr_lock in smk_write_net4addr
1096 *
1097 */
1098static void smk_net4addr_insert(struct smk_net4addr *new)
1099{
1100 struct smk_net4addr *m;
1101 struct smk_net4addr *m_next;
1102
1103 if (list_empty(&smk_net4addr_list)) {
1104 list_add_rcu(&new->list, &smk_net4addr_list);
1105 return;
1106 }
1107
1108 m = list_entry_rcu(smk_net4addr_list.next,
1109 struct smk_net4addr, list);
1110
1111 /* the comparison '>' is a bit hacky, but works */
1112 if (new->smk_masks > m->smk_masks) {
1113 list_add_rcu(&new->list, &smk_net4addr_list);
1114 return;
1115 }
1116
1117 list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1118 if (list_is_last(&m->list, &smk_net4addr_list)) {
1119 list_add_rcu(&new->list, &m->list);
1120 return;
1121 }
1122 m_next = list_entry_rcu(m->list.next,
1123 struct smk_net4addr, list);
1124 if (new->smk_masks > m_next->smk_masks) {
1125 list_add_rcu(&new->list, &m->list);
1126 return;
1127 }
1128 }
1129}
1130
1131
1132/**
1133 * smk_write_net4addr - write() for /smack/netlabel
1134 * @file: file pointer, not actually used
1135 * @buf: where to get the data from
1136 * @count: bytes sent
1137 * @ppos: where to start
1138 *
1139 * Accepts only one net4addr per write call.
1140 * Returns number of bytes written or error code, as appropriate
1141 */
1142static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1143 size_t count, loff_t *ppos)
1144{
1145 struct smk_net4addr *snp;
1146 struct sockaddr_in newname;
1147 char *smack;
1148 struct smack_known *skp = NULL;
1149 char *data;
1150 char *host = (char *)&newname.sin_addr.s_addr;
1151 int rc;
1152 struct netlbl_audit audit_info;
1153 struct in_addr mask;
1154 unsigned int m;
1155 unsigned int masks;
1156 int found;
1157 u32 mask_bits = (1<<31);
1158 __be32 nsa;
1159 u32 temp_mask;
1160
1161 /*
1162 * Must have privilege.
1163 * No partial writes.
1164 * Enough data must be present.
1165 * "<addr/mask, as a.b.c.d/e><space><label>"
1166 * "<addr, as a.b.c.d><space><label>"
1167 */
1168 if (!smack_privileged(CAP_MAC_ADMIN))
1169 return -EPERM;
1170 if (*ppos != 0)
1171 return -EINVAL;
1172 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1173 return -EINVAL;
1174
1175 data = memdup_user_nul(buf, count);
1176 if (IS_ERR(data))
1177 return PTR_ERR(data);
1178
1179 smack = kzalloc(count + 1, GFP_KERNEL);
1180 if (smack == NULL) {
1181 rc = -ENOMEM;
1182 goto free_data_out;
1183 }
1184
1185 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1186 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1187 if (rc != 6) {
1188 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1189 &host[0], &host[1], &host[2], &host[3], smack);
1190 if (rc != 5) {
1191 rc = -EINVAL;
1192 goto free_out;
1193 }
1194 m = BEBITS;
1195 masks = 32;
1196 }
1197 if (masks > BEBITS) {
1198 rc = -EINVAL;
1199 goto free_out;
1200 }
1201
1202 /*
1203 * If smack begins with '-', it is an option, don't import it
1204 */
1205 if (smack[0] != '-') {
1206 skp = smk_import_entry(smack, 0);
1207 if (IS_ERR(skp)) {
1208 rc = PTR_ERR(skp);
1209 goto free_out;
1210 }
1211 } else {
1212 /*
1213 * Only the -CIPSO option is supported for IPv4
1214 */
1215 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1216 rc = -EINVAL;
1217 goto free_out;
1218 }
1219 }
1220
1221 for (m = masks, temp_mask = 0; m > 0; m--) {
1222 temp_mask |= mask_bits;
1223 mask_bits >>= 1;
1224 }
1225 mask.s_addr = cpu_to_be32(temp_mask);
1226
1227 newname.sin_addr.s_addr &= mask.s_addr;
1228 /*
1229 * Only allow one writer at a time. Writes should be
1230 * quite rare and small in any case.
1231 */
1232 mutex_lock(&smk_net4addr_lock);
1233
1234 nsa = newname.sin_addr.s_addr;
1235 /* try to find if the prefix is already in the list */
1236 found = 0;
1237 list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1238 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1239 found = 1;
1240 break;
1241 }
1242 }
1243 smk_netlabel_audit_set(&audit_info);
1244
1245 if (found == 0) {
1246 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1247 if (snp == NULL)
1248 rc = -ENOMEM;
1249 else {
1250 rc = 0;
1251 snp->smk_host.s_addr = newname.sin_addr.s_addr;
1252 snp->smk_mask.s_addr = mask.s_addr;
1253 snp->smk_label = skp;
1254 snp->smk_masks = masks;
1255 smk_net4addr_insert(snp);
1256 }
1257 } else {
1258 /*
1259 * Delete the unlabeled entry, only if the previous label
1260 * wasn't the special CIPSO option
1261 */
1262 if (snp->smk_label != NULL)
1263 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1264 &snp->smk_host, &snp->smk_mask,
1265 PF_INET, &audit_info);
1266 else
1267 rc = 0;
1268 snp->smk_label = skp;
1269 }
1270
1271 /*
1272 * Now tell netlabel about the single label nature of
1273 * this host so that incoming packets get labeled.
1274 * but only if we didn't get the special CIPSO option
1275 */
1276 if (rc == 0 && skp != NULL)
1277 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1278 &snp->smk_host, &snp->smk_mask, PF_INET,
1279 snp->smk_label->smk_secid, &audit_info);
1280
1281 if (rc == 0)
1282 rc = count;
1283
1284 mutex_unlock(&smk_net4addr_lock);
1285
1286free_out:
1287 kfree(smack);
1288free_data_out:
1289 kfree(data);
1290
1291 return rc;
1292}
1293
1294static const struct file_operations smk_net4addr_ops = {
1295 .open = smk_open_net4addr,
1296 .read = seq_read,
1297 .llseek = seq_lseek,
1298 .write = smk_write_net4addr,
1299 .release = seq_release,
1300};
1301
1302#if IS_ENABLED(CONFIG_IPV6)
1303/*
1304 * Seq_file read operations for /smack/netlabel6
1305 */
1306
1307static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1308{
1309 return smk_seq_start(s, pos, &smk_net6addr_list);
1310}
1311
1312static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1313{
1314 return smk_seq_next(s, v, pos, &smk_net6addr_list);
1315}
1316
1317/*
1318 * Print host/label pairs
1319 */
1320static int net6addr_seq_show(struct seq_file *s, void *v)
1321{
1322 struct list_head *list = v;
1323 struct smk_net6addr *skp =
1324 list_entry(list, struct smk_net6addr, list);
1325
1326 if (skp->smk_label != NULL)
1327 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1328 skp->smk_label->smk_known);
1329
1330 return 0;
1331}
1332
1333static const struct seq_operations net6addr_seq_ops = {
1334 .start = net6addr_seq_start,
1335 .next = net6addr_seq_next,
1336 .show = net6addr_seq_show,
1337 .stop = smk_seq_stop,
1338};
1339
1340/**
1341 * smk_open_net6addr - open() for /smack/netlabel
1342 * @inode: inode structure representing file
1343 * @file: "netlabel" file pointer
1344 *
1345 * Connect our net6addr_seq_* operations with /smack/netlabel
1346 * file_operations
1347 */
1348static int smk_open_net6addr(struct inode *inode, struct file *file)
1349{
1350 return seq_open(file, &net6addr_seq_ops);
1351}
1352
1353/**
1354 * smk_net6addr_insert
1355 * @new : entry to insert
1356 *
1357 * This inserts an entry in the smack_net6addrs list
1358 * sorted by netmask length (longest to smallest)
1359 * locked by &smk_net6addr_lock in smk_write_net6addr
1360 *
1361 */
1362static void smk_net6addr_insert(struct smk_net6addr *new)
1363{
1364 struct smk_net6addr *m_next;
1365 struct smk_net6addr *m;
1366
1367 if (list_empty(&smk_net6addr_list)) {
1368 list_add_rcu(&new->list, &smk_net6addr_list);
1369 return;
1370 }
1371
1372 m = list_entry_rcu(smk_net6addr_list.next,
1373 struct smk_net6addr, list);
1374
1375 if (new->smk_masks > m->smk_masks) {
1376 list_add_rcu(&new->list, &smk_net6addr_list);
1377 return;
1378 }
1379
1380 list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1381 if (list_is_last(&m->list, &smk_net6addr_list)) {
1382 list_add_rcu(&new->list, &m->list);
1383 return;
1384 }
1385 m_next = list_entry_rcu(m->list.next,
1386 struct smk_net6addr, list);
1387 if (new->smk_masks > m_next->smk_masks) {
1388 list_add_rcu(&new->list, &m->list);
1389 return;
1390 }
1391 }
1392}
1393
1394
1395/**
1396 * smk_write_net6addr - write() for /smack/netlabel
1397 * @file: file pointer, not actually used
1398 * @buf: where to get the data from
1399 * @count: bytes sent
1400 * @ppos: where to start
1401 *
1402 * Accepts only one net6addr per write call.
1403 * Returns number of bytes written or error code, as appropriate
1404 */
1405static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1406 size_t count, loff_t *ppos)
1407{
1408 struct smk_net6addr *snp;
1409 struct in6_addr newname;
1410 struct in6_addr fullmask;
1411 struct smack_known *skp = NULL;
1412 char *smack;
1413 char *data;
1414 int rc = 0;
1415 int found = 0;
1416 int i;
1417 unsigned int scanned[8];
1418 unsigned int m;
1419 unsigned int mask = 128;
1420
1421 /*
1422 * Must have privilege.
1423 * No partial writes.
1424 * Enough data must be present.
1425 * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1426 * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1427 */
1428 if (!smack_privileged(CAP_MAC_ADMIN))
1429 return -EPERM;
1430 if (*ppos != 0)
1431 return -EINVAL;
1432 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1433 return -EINVAL;
1434
1435 data = memdup_user_nul(buf, count);
1436 if (IS_ERR(data))
1437 return PTR_ERR(data);
1438
1439 smack = kzalloc(count + 1, GFP_KERNEL);
1440 if (smack == NULL) {
1441 rc = -ENOMEM;
1442 goto free_data_out;
1443 }
1444
1445 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1446 &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1447 &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1448 &mask, smack);
1449 if (i != 10) {
1450 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1451 &scanned[0], &scanned[1], &scanned[2],
1452 &scanned[3], &scanned[4], &scanned[5],
1453 &scanned[6], &scanned[7], smack);
1454 if (i != 9) {
1455 rc = -EINVAL;
1456 goto free_out;
1457 }
1458 }
1459 if (mask > 128) {
1460 rc = -EINVAL;
1461 goto free_out;
1462 }
1463 for (i = 0; i < 8; i++) {
1464 if (scanned[i] > 0xffff) {
1465 rc = -EINVAL;
1466 goto free_out;
1467 }
1468 newname.s6_addr16[i] = htons(scanned[i]);
1469 }
1470
1471 /*
1472 * If smack begins with '-', it is an option, don't import it
1473 */
1474 if (smack[0] != '-') {
1475 skp = smk_import_entry(smack, 0);
1476 if (IS_ERR(skp)) {
1477 rc = PTR_ERR(skp);
1478 goto free_out;
1479 }
1480 } else {
1481 /*
1482 * Only -DELETE is supported for IPv6
1483 */
1484 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1485 rc = -EINVAL;
1486 goto free_out;
1487 }
1488 }
1489
1490 for (i = 0, m = mask; i < 8; i++) {
1491 if (m >= 16) {
1492 fullmask.s6_addr16[i] = 0xffff;
1493 m -= 16;
1494 } else if (m > 0) {
1495 fullmask.s6_addr16[i] = (1 << m) - 1;
1496 m = 0;
1497 } else
1498 fullmask.s6_addr16[i] = 0;
1499 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1500 }
1501
1502 /*
1503 * Only allow one writer at a time. Writes should be
1504 * quite rare and small in any case.
1505 */
1506 mutex_lock(&smk_net6addr_lock);
1507 /*
1508 * Try to find the prefix in the list
1509 */
1510 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1511 if (mask != snp->smk_masks)
1512 continue;
1513 for (found = 1, i = 0; i < 8; i++) {
1514 if (newname.s6_addr16[i] !=
1515 snp->smk_host.s6_addr16[i]) {
1516 found = 0;
1517 break;
1518 }
1519 }
1520 if (found == 1)
1521 break;
1522 }
1523 if (found == 0) {
1524 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1525 if (snp == NULL)
1526 rc = -ENOMEM;
1527 else {
1528 snp->smk_host = newname;
1529 snp->smk_mask = fullmask;
1530 snp->smk_masks = mask;
1531 snp->smk_label = skp;
1532 smk_net6addr_insert(snp);
1533 }
1534 } else {
1535 snp->smk_label = skp;
1536 }
1537
1538 if (rc == 0)
1539 rc = count;
1540
1541 mutex_unlock(&smk_net6addr_lock);
1542
1543free_out:
1544 kfree(smack);
1545free_data_out:
1546 kfree(data);
1547
1548 return rc;
1549}
1550
1551static const struct file_operations smk_net6addr_ops = {
1552 .open = smk_open_net6addr,
1553 .read = seq_read,
1554 .llseek = seq_lseek,
1555 .write = smk_write_net6addr,
1556 .release = seq_release,
1557};
1558#endif /* CONFIG_IPV6 */
1559
1560/**
1561 * smk_read_doi - read() for /smack/doi
1562 * @filp: file pointer, not actually used
1563 * @buf: where to put the result
1564 * @count: maximum to send along
1565 * @ppos: where to start
1566 *
1567 * Returns number of bytes read or error code, as appropriate
1568 */
1569static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1570 size_t count, loff_t *ppos)
1571{
1572 char temp[80];
1573 ssize_t rc;
1574
1575 if (*ppos != 0)
1576 return 0;
1577
1578 sprintf(temp, "%d", smk_cipso_doi_value);
1579 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1580
1581 return rc;
1582}
1583
1584/**
1585 * smk_write_doi - write() for /smack/doi
1586 * @file: file pointer, not actually used
1587 * @buf: where to get the data from
1588 * @count: bytes sent
1589 * @ppos: where to start
1590 *
1591 * Returns number of bytes written or error code, as appropriate
1592 */
1593static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1594 size_t count, loff_t *ppos)
1595{
1596 char temp[80];
1597 int i;
1598
1599 if (!smack_privileged(CAP_MAC_ADMIN))
1600 return -EPERM;
1601
1602 if (count >= sizeof(temp) || count == 0)
1603 return -EINVAL;
1604
1605 if (copy_from_user(temp, buf, count) != 0)
1606 return -EFAULT;
1607
1608 temp[count] = '\0';
1609
1610 if (sscanf(temp, "%d", &i) != 1)
1611 return -EINVAL;
1612
1613 smk_cipso_doi_value = i;
1614
1615 smk_cipso_doi();
1616
1617 return count;
1618}
1619
1620static const struct file_operations smk_doi_ops = {
1621 .read = smk_read_doi,
1622 .write = smk_write_doi,
1623 .llseek = default_llseek,
1624};
1625
1626/**
1627 * smk_read_direct - read() for /smack/direct
1628 * @filp: file pointer, not actually used
1629 * @buf: where to put the result
1630 * @count: maximum to send along
1631 * @ppos: where to start
1632 *
1633 * Returns number of bytes read or error code, as appropriate
1634 */
1635static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1636 size_t count, loff_t *ppos)
1637{
1638 char temp[80];
1639 ssize_t rc;
1640
1641 if (*ppos != 0)
1642 return 0;
1643
1644 sprintf(temp, "%d", smack_cipso_direct);
1645 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1646
1647 return rc;
1648}
1649
1650/**
1651 * smk_write_direct - write() for /smack/direct
1652 * @file: file pointer, not actually used
1653 * @buf: where to get the data from
1654 * @count: bytes sent
1655 * @ppos: where to start
1656 *
1657 * Returns number of bytes written or error code, as appropriate
1658 */
1659static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1660 size_t count, loff_t *ppos)
1661{
1662 struct smack_known *skp;
1663 char temp[80];
1664 int i;
1665
1666 if (!smack_privileged(CAP_MAC_ADMIN))
1667 return -EPERM;
1668
1669 if (count >= sizeof(temp) || count == 0)
1670 return -EINVAL;
1671
1672 if (copy_from_user(temp, buf, count) != 0)
1673 return -EFAULT;
1674
1675 temp[count] = '\0';
1676
1677 if (sscanf(temp, "%d", &i) != 1)
1678 return -EINVAL;
1679
1680 /*
1681 * Don't do anything if the value hasn't actually changed.
1682 * If it is changing reset the level on entries that were
1683 * set up to be direct when they were created.
1684 */
1685 if (smack_cipso_direct != i) {
1686 mutex_lock(&smack_known_lock);
1687 list_for_each_entry_rcu(skp, &smack_known_list, list)
1688 if (skp->smk_netlabel.attr.mls.lvl ==
1689 smack_cipso_direct)
1690 skp->smk_netlabel.attr.mls.lvl = i;
1691 smack_cipso_direct = i;
1692 mutex_unlock(&smack_known_lock);
1693 }
1694
1695 return count;
1696}
1697
1698static const struct file_operations smk_direct_ops = {
1699 .read = smk_read_direct,
1700 .write = smk_write_direct,
1701 .llseek = default_llseek,
1702};
1703
1704/**
1705 * smk_read_mapped - read() for /smack/mapped
1706 * @filp: file pointer, not actually used
1707 * @buf: where to put the result
1708 * @count: maximum to send along
1709 * @ppos: where to start
1710 *
1711 * Returns number of bytes read or error code, as appropriate
1712 */
1713static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1714 size_t count, loff_t *ppos)
1715{
1716 char temp[80];
1717 ssize_t rc;
1718
1719 if (*ppos != 0)
1720 return 0;
1721
1722 sprintf(temp, "%d", smack_cipso_mapped);
1723 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1724
1725 return rc;
1726}
1727
1728/**
1729 * smk_write_mapped - write() for /smack/mapped
1730 * @file: file pointer, not actually used
1731 * @buf: where to get the data from
1732 * @count: bytes sent
1733 * @ppos: where to start
1734 *
1735 * Returns number of bytes written or error code, as appropriate
1736 */
1737static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1738 size_t count, loff_t *ppos)
1739{
1740 struct smack_known *skp;
1741 char temp[80];
1742 int i;
1743
1744 if (!smack_privileged(CAP_MAC_ADMIN))
1745 return -EPERM;
1746
1747 if (count >= sizeof(temp) || count == 0)
1748 return -EINVAL;
1749
1750 if (copy_from_user(temp, buf, count) != 0)
1751 return -EFAULT;
1752
1753 temp[count] = '\0';
1754
1755 if (sscanf(temp, "%d", &i) != 1)
1756 return -EINVAL;
1757
1758 /*
1759 * Don't do anything if the value hasn't actually changed.
1760 * If it is changing reset the level on entries that were
1761 * set up to be mapped when they were created.
1762 */
1763 if (smack_cipso_mapped != i) {
1764 mutex_lock(&smack_known_lock);
1765 list_for_each_entry_rcu(skp, &smack_known_list, list)
1766 if (skp->smk_netlabel.attr.mls.lvl ==
1767 smack_cipso_mapped)
1768 skp->smk_netlabel.attr.mls.lvl = i;
1769 smack_cipso_mapped = i;
1770 mutex_unlock(&smack_known_lock);
1771 }
1772
1773 return count;
1774}
1775
1776static const struct file_operations smk_mapped_ops = {
1777 .read = smk_read_mapped,
1778 .write = smk_write_mapped,
1779 .llseek = default_llseek,
1780};
1781
1782/**
1783 * smk_read_ambient - read() for /smack/ambient
1784 * @filp: file pointer, not actually used
1785 * @buf: where to put the result
1786 * @cn: maximum to send along
1787 * @ppos: where to start
1788 *
1789 * Returns number of bytes read or error code, as appropriate
1790 */
1791static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1792 size_t cn, loff_t *ppos)
1793{
1794 ssize_t rc;
1795 int asize;
1796
1797 if (*ppos != 0)
1798 return 0;
1799 /*
1800 * Being careful to avoid a problem in the case where
1801 * smack_net_ambient gets changed in midstream.
1802 */
1803 mutex_lock(&smack_ambient_lock);
1804
1805 asize = strlen(smack_net_ambient->smk_known) + 1;
1806
1807 if (cn >= asize)
1808 rc = simple_read_from_buffer(buf, cn, ppos,
1809 smack_net_ambient->smk_known,
1810 asize);
1811 else
1812 rc = -EINVAL;
1813
1814 mutex_unlock(&smack_ambient_lock);
1815
1816 return rc;
1817}
1818
1819/**
1820 * smk_write_ambient - write() for /smack/ambient
1821 * @file: file pointer, not actually used
1822 * @buf: where to get the data from
1823 * @count: bytes sent
1824 * @ppos: where to start
1825 *
1826 * Returns number of bytes written or error code, as appropriate
1827 */
1828static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1829 size_t count, loff_t *ppos)
1830{
1831 struct smack_known *skp;
1832 char *oldambient;
1833 char *data;
1834 int rc = count;
1835
1836 if (!smack_privileged(CAP_MAC_ADMIN))
1837 return -EPERM;
1838
1839 /* Enough data must be present */
1840 if (count == 0 || count > PAGE_SIZE)
1841 return -EINVAL;
1842
1843 data = memdup_user_nul(buf, count);
1844 if (IS_ERR(data))
1845 return PTR_ERR(data);
1846
1847 skp = smk_import_entry(data, count);
1848 if (IS_ERR(skp)) {
1849 rc = PTR_ERR(skp);
1850 goto out;
1851 }
1852
1853 mutex_lock(&smack_ambient_lock);
1854
1855 oldambient = smack_net_ambient->smk_known;
1856 smack_net_ambient = skp;
1857 smk_unlbl_ambient(oldambient);
1858
1859 mutex_unlock(&smack_ambient_lock);
1860
1861out:
1862 kfree(data);
1863 return rc;
1864}
1865
1866static const struct file_operations smk_ambient_ops = {
1867 .read = smk_read_ambient,
1868 .write = smk_write_ambient,
1869 .llseek = default_llseek,
1870};
1871
1872/*
1873 * Seq_file operations for /smack/onlycap
1874 */
1875static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1876{
1877 return smk_seq_start(s, pos, &smack_onlycap_list);
1878}
1879
1880static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1881{
1882 return smk_seq_next(s, v, pos, &smack_onlycap_list);
1883}
1884
1885static int onlycap_seq_show(struct seq_file *s, void *v)
1886{
1887 struct list_head *list = v;
1888 struct smack_known_list_elem *sklep =
1889 list_entry_rcu(list, struct smack_known_list_elem, list);
1890
1891 seq_puts(s, sklep->smk_label->smk_known);
1892 seq_putc(s, ' ');
1893
1894 return 0;
1895}
1896
1897static const struct seq_operations onlycap_seq_ops = {
1898 .start = onlycap_seq_start,
1899 .next = onlycap_seq_next,
1900 .show = onlycap_seq_show,
1901 .stop = smk_seq_stop,
1902};
1903
1904static int smk_open_onlycap(struct inode *inode, struct file *file)
1905{
1906 return seq_open(file, &onlycap_seq_ops);
1907}
1908
1909/**
1910 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1911 * The caller must hold appropriate mutex to prevent concurrent modifications
1912 * to the public list.
1913 * Private list is assumed to be not accessible to other threads yet.
1914 *
1915 * @public: public list
1916 * @private: private list
1917 */
1918static void smk_list_swap_rcu(struct list_head *public,
1919 struct list_head *private)
1920{
1921 struct list_head *first, *last;
1922
1923 if (list_empty(public)) {
1924 list_splice_init_rcu(private, public, synchronize_rcu);
1925 } else {
1926 /* Remember public list before replacing it */
1927 first = public->next;
1928 last = public->prev;
1929
1930 /* Publish private list in place of public in RCU-safe way */
1931 private->prev->next = public;
1932 private->next->prev = public;
1933 rcu_assign_pointer(public->next, private->next);
1934 public->prev = private->prev;
1935
1936 synchronize_rcu();
1937
1938 /* When all readers are done with the old public list,
1939 * attach it in place of private */
1940 private->next = first;
1941 private->prev = last;
1942 first->prev = private;
1943 last->next = private;
1944 }
1945}
1946
1947/**
1948 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1949 *
1950 * @data: the string to parse
1951 * @list: destination list
1952 *
1953 * Returns zero on success or error code, as appropriate
1954 */
1955static int smk_parse_label_list(char *data, struct list_head *list)
1956{
1957 char *tok;
1958 struct smack_known *skp;
1959 struct smack_known_list_elem *sklep;
1960
1961 while ((tok = strsep(&data, " ")) != NULL) {
1962 if (!*tok)
1963 continue;
1964
1965 skp = smk_import_entry(tok, 0);
1966 if (IS_ERR(skp))
1967 return PTR_ERR(skp);
1968
1969 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1970 if (sklep == NULL)
1971 return -ENOMEM;
1972
1973 sklep->smk_label = skp;
1974 list_add(&sklep->list, list);
1975 }
1976
1977 return 0;
1978}
1979
1980/**
1981 * smk_destroy_label_list - destroy a list of smack_known_list_elem
1982 * @list: header pointer of the list to destroy
1983 */
1984void smk_destroy_label_list(struct list_head *list)
1985{
1986 struct smack_known_list_elem *sklep;
1987 struct smack_known_list_elem *sklep2;
1988
1989 list_for_each_entry_safe(sklep, sklep2, list, list)
1990 kfree(sklep);
1991
1992 INIT_LIST_HEAD(list);
1993}
1994
1995/**
1996 * smk_write_onlycap - write() for smackfs/onlycap
1997 * @file: file pointer, not actually used
1998 * @buf: where to get the data from
1999 * @count: bytes sent
2000 * @ppos: where to start
2001 *
2002 * Returns number of bytes written or error code, as appropriate
2003 */
2004static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
2005 size_t count, loff_t *ppos)
2006{
2007 char *data;
2008 LIST_HEAD(list_tmp);
2009 int rc;
2010
2011 if (!smack_privileged(CAP_MAC_ADMIN))
2012 return -EPERM;
2013
2014 if (count > PAGE_SIZE)
2015 return -EINVAL;
2016
2017 data = memdup_user_nul(buf, count);
2018 if (IS_ERR(data))
2019 return PTR_ERR(data);
2020
2021 rc = smk_parse_label_list(data, &list_tmp);
2022 kfree(data);
2023
2024 /*
2025 * Clear the smack_onlycap on invalid label errors. This means
2026 * that we can pass a null string to unset the onlycap value.
2027 *
2028 * Importing will also reject a label beginning with '-',
2029 * so "-usecapabilities" will also work.
2030 *
2031 * But do so only on invalid label, not on system errors.
2032 * The invalid label must be first to count as clearing attempt.
2033 */
2034 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2035 mutex_lock(&smack_onlycap_lock);
2036 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2037 mutex_unlock(&smack_onlycap_lock);
2038 rc = count;
2039 }
2040
2041 smk_destroy_label_list(&list_tmp);
2042
2043 return rc;
2044}
2045
2046static const struct file_operations smk_onlycap_ops = {
2047 .open = smk_open_onlycap,
2048 .read = seq_read,
2049 .write = smk_write_onlycap,
2050 .llseek = seq_lseek,
2051 .release = seq_release,
2052};
2053
2054#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2055/**
2056 * smk_read_unconfined - read() for smackfs/unconfined
2057 * @filp: file pointer, not actually used
2058 * @buf: where to put the result
2059 * @cn: maximum to send along
2060 * @ppos: where to start
2061 *
2062 * Returns number of bytes read or error code, as appropriate
2063 */
2064static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2065 size_t cn, loff_t *ppos)
2066{
2067 char *smack = "";
2068 ssize_t rc = -EINVAL;
2069 int asize;
2070
2071 if (*ppos != 0)
2072 return 0;
2073
2074 if (smack_unconfined != NULL)
2075 smack = smack_unconfined->smk_known;
2076
2077 asize = strlen(smack) + 1;
2078
2079 if (cn >= asize)
2080 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2081
2082 return rc;
2083}
2084
2085/**
2086 * smk_write_unconfined - write() for smackfs/unconfined
2087 * @file: file pointer, not actually used
2088 * @buf: where to get the data from
2089 * @count: bytes sent
2090 * @ppos: where to start
2091 *
2092 * Returns number of bytes written or error code, as appropriate
2093 */
2094static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2095 size_t count, loff_t *ppos)
2096{
2097 char *data;
2098 struct smack_known *skp;
2099 int rc = count;
2100
2101 if (!smack_privileged(CAP_MAC_ADMIN))
2102 return -EPERM;
2103
2104 if (count > PAGE_SIZE)
2105 return -EINVAL;
2106
2107 data = memdup_user_nul(buf, count);
2108 if (IS_ERR(data))
2109 return PTR_ERR(data);
2110
2111 /*
2112 * Clear the smack_unconfined on invalid label errors. This means
2113 * that we can pass a null string to unset the unconfined value.
2114 *
2115 * Importing will also reject a label beginning with '-',
2116 * so "-confine" will also work.
2117 *
2118 * But do so only on invalid label, not on system errors.
2119 */
2120 skp = smk_import_entry(data, count);
2121 if (PTR_ERR(skp) == -EINVAL)
2122 skp = NULL;
2123 else if (IS_ERR(skp)) {
2124 rc = PTR_ERR(skp);
2125 goto freeout;
2126 }
2127
2128 smack_unconfined = skp;
2129
2130freeout:
2131 kfree(data);
2132 return rc;
2133}
2134
2135static const struct file_operations smk_unconfined_ops = {
2136 .read = smk_read_unconfined,
2137 .write = smk_write_unconfined,
2138 .llseek = default_llseek,
2139};
2140#endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2141
2142/**
2143 * smk_read_logging - read() for /smack/logging
2144 * @filp: file pointer, not actually used
2145 * @buf: where to put the result
2146 * @count: maximum to send along
2147 * @ppos: where to start
2148 *
2149 * Returns number of bytes read or error code, as appropriate
2150 */
2151static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2152 size_t count, loff_t *ppos)
2153{
2154 char temp[32];
2155 ssize_t rc;
2156
2157 if (*ppos != 0)
2158 return 0;
2159
2160 sprintf(temp, "%d\n", log_policy);
2161 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2162 return rc;
2163}
2164
2165/**
2166 * smk_write_logging - write() for /smack/logging
2167 * @file: file pointer, not actually used
2168 * @buf: where to get the data from
2169 * @count: bytes sent
2170 * @ppos: where to start
2171 *
2172 * Returns number of bytes written or error code, as appropriate
2173 */
2174static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2175 size_t count, loff_t *ppos)
2176{
2177 char temp[32];
2178 int i;
2179
2180 if (!smack_privileged(CAP_MAC_ADMIN))
2181 return -EPERM;
2182
2183 if (count >= sizeof(temp) || count == 0)
2184 return -EINVAL;
2185
2186 if (copy_from_user(temp, buf, count) != 0)
2187 return -EFAULT;
2188
2189 temp[count] = '\0';
2190
2191 if (sscanf(temp, "%d", &i) != 1)
2192 return -EINVAL;
2193 if (i < 0 || i > 3)
2194 return -EINVAL;
2195 log_policy = i;
2196 return count;
2197}
2198
2199
2200
2201static const struct file_operations smk_logging_ops = {
2202 .read = smk_read_logging,
2203 .write = smk_write_logging,
2204 .llseek = default_llseek,
2205};
2206
2207/*
2208 * Seq_file read operations for /smack/load-self
2209 */
2210
2211static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2212{
2213 struct task_smack *tsp = smack_cred(current_cred());
2214
2215 return smk_seq_start(s, pos, &tsp->smk_rules);
2216}
2217
2218static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2219{
2220 struct task_smack *tsp = smack_cred(current_cred());
2221
2222 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2223}
2224
2225static int load_self_seq_show(struct seq_file *s, void *v)
2226{
2227 struct list_head *list = v;
2228 struct smack_rule *srp =
2229 list_entry_rcu(list, struct smack_rule, list);
2230
2231 smk_rule_show(s, srp, SMK_LABELLEN);
2232
2233 return 0;
2234}
2235
2236static const struct seq_operations load_self_seq_ops = {
2237 .start = load_self_seq_start,
2238 .next = load_self_seq_next,
2239 .show = load_self_seq_show,
2240 .stop = smk_seq_stop,
2241};
2242
2243
2244/**
2245 * smk_open_load_self - open() for /smack/load-self2
2246 * @inode: inode structure representing file
2247 * @file: "load" file pointer
2248 *
2249 * For reading, use load_seq_* seq_file reading operations.
2250 */
2251static int smk_open_load_self(struct inode *inode, struct file *file)
2252{
2253 return seq_open(file, &load_self_seq_ops);
2254}
2255
2256/**
2257 * smk_write_load_self - write() for /smack/load-self
2258 * @file: file pointer, not actually used
2259 * @buf: where to get the data from
2260 * @count: bytes sent
2261 * @ppos: where to start - must be 0
2262 *
2263 */
2264static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2265 size_t count, loff_t *ppos)
2266{
2267 struct task_smack *tsp = smack_cred(current_cred());
2268
2269 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2270 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2271}
2272
2273static const struct file_operations smk_load_self_ops = {
2274 .open = smk_open_load_self,
2275 .read = seq_read,
2276 .llseek = seq_lseek,
2277 .write = smk_write_load_self,
2278 .release = seq_release,
2279};
2280
2281/**
2282 * smk_user_access - handle access check transaction
2283 * @file: file pointer
2284 * @buf: data from user space
2285 * @count: bytes sent
2286 * @ppos: where to start - must be 0
2287 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
2288 */
2289static ssize_t smk_user_access(struct file *file, const char __user *buf,
2290 size_t count, loff_t *ppos, int format)
2291{
2292 struct smack_parsed_rule rule;
2293 char *data;
2294 int res;
2295
2296 data = simple_transaction_get(file, buf, count);
2297 if (IS_ERR(data))
2298 return PTR_ERR(data);
2299
2300 if (format == SMK_FIXED24_FMT) {
2301 if (count < SMK_LOADLEN)
2302 return -EINVAL;
2303 res = smk_parse_rule(data, &rule, 0);
2304 } else {
2305 /*
2306 * simple_transaction_get() returns null-terminated data
2307 */
2308 res = smk_parse_long_rule(data, &rule, 0, 3);
2309 }
2310
2311 if (res >= 0)
2312 res = smk_access(rule.smk_subject, rule.smk_object,
2313 rule.smk_access1, NULL);
2314 else if (res != -ENOENT)
2315 return res;
2316
2317 /*
2318 * smk_access() can return a value > 0 in the "bringup" case.
2319 */
2320 data[0] = res >= 0 ? '1' : '0';
2321 data[1] = '\0';
2322
2323 simple_transaction_set(file, 2);
2324
2325 if (format == SMK_FIXED24_FMT)
2326 return SMK_LOADLEN;
2327 return count;
2328}
2329
2330/**
2331 * smk_write_access - handle access check transaction
2332 * @file: file pointer
2333 * @buf: data from user space
2334 * @count: bytes sent
2335 * @ppos: where to start - must be 0
2336 */
2337static ssize_t smk_write_access(struct file *file, const char __user *buf,
2338 size_t count, loff_t *ppos)
2339{
2340 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2341}
2342
2343static const struct file_operations smk_access_ops = {
2344 .write = smk_write_access,
2345 .read = simple_transaction_read,
2346 .release = simple_transaction_release,
2347 .llseek = generic_file_llseek,
2348};
2349
2350
2351/*
2352 * Seq_file read operations for /smack/load2
2353 */
2354
2355static int load2_seq_show(struct seq_file *s, void *v)
2356{
2357 struct list_head *list = v;
2358 struct smack_rule *srp;
2359 struct smack_known *skp =
2360 list_entry_rcu(list, struct smack_known, list);
2361
2362 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
2363 smk_rule_show(s, srp, SMK_LONGLABEL);
2364
2365 return 0;
2366}
2367
2368static const struct seq_operations load2_seq_ops = {
2369 .start = load2_seq_start,
2370 .next = load2_seq_next,
2371 .show = load2_seq_show,
2372 .stop = smk_seq_stop,
2373};
2374
2375/**
2376 * smk_open_load2 - open() for /smack/load2
2377 * @inode: inode structure representing file
2378 * @file: "load2" file pointer
2379 *
2380 * For reading, use load2_seq_* seq_file reading operations.
2381 */
2382static int smk_open_load2(struct inode *inode, struct file *file)
2383{
2384 return seq_open(file, &load2_seq_ops);
2385}
2386
2387/**
2388 * smk_write_load2 - write() for /smack/load2
2389 * @file: file pointer, not actually used
2390 * @buf: where to get the data from
2391 * @count: bytes sent
2392 * @ppos: where to start - must be 0
2393 *
2394 */
2395static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2396 size_t count, loff_t *ppos)
2397{
2398 /*
2399 * Must have privilege.
2400 */
2401 if (!smack_privileged(CAP_MAC_ADMIN))
2402 return -EPERM;
2403
2404 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2405 SMK_LONG_FMT);
2406}
2407
2408static const struct file_operations smk_load2_ops = {
2409 .open = smk_open_load2,
2410 .read = seq_read,
2411 .llseek = seq_lseek,
2412 .write = smk_write_load2,
2413 .release = seq_release,
2414};
2415
2416/*
2417 * Seq_file read operations for /smack/load-self2
2418 */
2419
2420static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2421{
2422 struct task_smack *tsp = smack_cred(current_cred());
2423
2424 return smk_seq_start(s, pos, &tsp->smk_rules);
2425}
2426
2427static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2428{
2429 struct task_smack *tsp = smack_cred(current_cred());
2430
2431 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2432}
2433
2434static int load_self2_seq_show(struct seq_file *s, void *v)
2435{
2436 struct list_head *list = v;
2437 struct smack_rule *srp =
2438 list_entry_rcu(list, struct smack_rule, list);
2439
2440 smk_rule_show(s, srp, SMK_LONGLABEL);
2441
2442 return 0;
2443}
2444
2445static const struct seq_operations load_self2_seq_ops = {
2446 .start = load_self2_seq_start,
2447 .next = load_self2_seq_next,
2448 .show = load_self2_seq_show,
2449 .stop = smk_seq_stop,
2450};
2451
2452/**
2453 * smk_open_load_self2 - open() for /smack/load-self2
2454 * @inode: inode structure representing file
2455 * @file: "load" file pointer
2456 *
2457 * For reading, use load_seq_* seq_file reading operations.
2458 */
2459static int smk_open_load_self2(struct inode *inode, struct file *file)
2460{
2461 return seq_open(file, &load_self2_seq_ops);
2462}
2463
2464/**
2465 * smk_write_load_self2 - write() for /smack/load-self2
2466 * @file: file pointer, not actually used
2467 * @buf: where to get the data from
2468 * @count: bytes sent
2469 * @ppos: where to start - must be 0
2470 *
2471 */
2472static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2473 size_t count, loff_t *ppos)
2474{
2475 struct task_smack *tsp = smack_cred(current_cred());
2476
2477 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2478 &tsp->smk_rules_lock, SMK_LONG_FMT);
2479}
2480
2481static const struct file_operations smk_load_self2_ops = {
2482 .open = smk_open_load_self2,
2483 .read = seq_read,
2484 .llseek = seq_lseek,
2485 .write = smk_write_load_self2,
2486 .release = seq_release,
2487};
2488
2489/**
2490 * smk_write_access2 - handle access check transaction
2491 * @file: file pointer
2492 * @buf: data from user space
2493 * @count: bytes sent
2494 * @ppos: where to start - must be 0
2495 */
2496static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2497 size_t count, loff_t *ppos)
2498{
2499 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2500}
2501
2502static const struct file_operations smk_access2_ops = {
2503 .write = smk_write_access2,
2504 .read = simple_transaction_read,
2505 .release = simple_transaction_release,
2506 .llseek = generic_file_llseek,
2507};
2508
2509/**
2510 * smk_write_revoke_subj - write() for /smack/revoke-subject
2511 * @file: file pointer
2512 * @buf: data from user space
2513 * @count: bytes sent
2514 * @ppos: where to start - must be 0
2515 */
2516static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2517 size_t count, loff_t *ppos)
2518{
2519 char *data;
2520 const char *cp;
2521 struct smack_known *skp;
2522 struct smack_rule *sp;
2523 struct list_head *rule_list;
2524 struct mutex *rule_lock;
2525 int rc = count;
2526
2527 if (*ppos != 0)
2528 return -EINVAL;
2529
2530 if (!smack_privileged(CAP_MAC_ADMIN))
2531 return -EPERM;
2532
2533 if (count == 0 || count > SMK_LONGLABEL)
2534 return -EINVAL;
2535
2536 data = memdup_user(buf, count);
2537 if (IS_ERR(data))
2538 return PTR_ERR(data);
2539
2540 cp = smk_parse_smack(data, count);
2541 if (IS_ERR(cp)) {
2542 rc = PTR_ERR(cp);
2543 goto out_data;
2544 }
2545
2546 skp = smk_find_entry(cp);
2547 if (skp == NULL)
2548 goto out_cp;
2549
2550 rule_list = &skp->smk_rules;
2551 rule_lock = &skp->smk_rules_lock;
2552
2553 mutex_lock(rule_lock);
2554
2555 list_for_each_entry_rcu(sp, rule_list, list)
2556 sp->smk_access = 0;
2557
2558 mutex_unlock(rule_lock);
2559
2560out_cp:
2561 kfree(cp);
2562out_data:
2563 kfree(data);
2564
2565 return rc;
2566}
2567
2568static const struct file_operations smk_revoke_subj_ops = {
2569 .write = smk_write_revoke_subj,
2570 .read = simple_transaction_read,
2571 .release = simple_transaction_release,
2572 .llseek = generic_file_llseek,
2573};
2574
2575/**
2576 * smk_init_sysfs - initialize /sys/fs/smackfs
2577 *
2578 */
2579static int smk_init_sysfs(void)
2580{
2581 return sysfs_create_mount_point(fs_kobj, "smackfs");
2582}
2583
2584/**
2585 * smk_write_change_rule - write() for /smack/change-rule
2586 * @file: file pointer
2587 * @buf: data from user space
2588 * @count: bytes sent
2589 * @ppos: where to start - must be 0
2590 */
2591static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2592 size_t count, loff_t *ppos)
2593{
2594 /*
2595 * Must have privilege.
2596 */
2597 if (!smack_privileged(CAP_MAC_ADMIN))
2598 return -EPERM;
2599
2600 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2601 SMK_CHANGE_FMT);
2602}
2603
2604static const struct file_operations smk_change_rule_ops = {
2605 .write = smk_write_change_rule,
2606 .read = simple_transaction_read,
2607 .release = simple_transaction_release,
2608 .llseek = generic_file_llseek,
2609};
2610
2611/**
2612 * smk_read_syslog - read() for smackfs/syslog
2613 * @filp: file pointer, not actually used
2614 * @buf: where to put the result
2615 * @cn: maximum to send along
2616 * @ppos: where to start
2617 *
2618 * Returns number of bytes read or error code, as appropriate
2619 */
2620static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2621 size_t cn, loff_t *ppos)
2622{
2623 struct smack_known *skp;
2624 ssize_t rc = -EINVAL;
2625 int asize;
2626
2627 if (*ppos != 0)
2628 return 0;
2629
2630 if (smack_syslog_label == NULL)
2631 skp = &smack_known_star;
2632 else
2633 skp = smack_syslog_label;
2634
2635 asize = strlen(skp->smk_known) + 1;
2636
2637 if (cn >= asize)
2638 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2639 asize);
2640
2641 return rc;
2642}
2643
2644/**
2645 * smk_write_syslog - write() for smackfs/syslog
2646 * @file: file pointer, not actually used
2647 * @buf: where to get the data from
2648 * @count: bytes sent
2649 * @ppos: where to start
2650 *
2651 * Returns number of bytes written or error code, as appropriate
2652 */
2653static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2654 size_t count, loff_t *ppos)
2655{
2656 char *data;
2657 struct smack_known *skp;
2658 int rc = count;
2659
2660 if (!smack_privileged(CAP_MAC_ADMIN))
2661 return -EPERM;
2662
2663 /* Enough data must be present */
2664 if (count == 0 || count > PAGE_SIZE)
2665 return -EINVAL;
2666
2667 data = memdup_user_nul(buf, count);
2668 if (IS_ERR(data))
2669 return PTR_ERR(data);
2670
2671 skp = smk_import_entry(data, count);
2672 if (IS_ERR(skp))
2673 rc = PTR_ERR(skp);
2674 else
2675 smack_syslog_label = skp;
2676
2677 kfree(data);
2678 return rc;
2679}
2680
2681static const struct file_operations smk_syslog_ops = {
2682 .read = smk_read_syslog,
2683 .write = smk_write_syslog,
2684 .llseek = default_llseek,
2685};
2686
2687/*
2688 * Seq_file read operations for /smack/relabel-self
2689 */
2690
2691static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2692{
2693 struct task_smack *tsp = smack_cred(current_cred());
2694
2695 return smk_seq_start(s, pos, &tsp->smk_relabel);
2696}
2697
2698static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2699{
2700 struct task_smack *tsp = smack_cred(current_cred());
2701
2702 return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2703}
2704
2705static int relabel_self_seq_show(struct seq_file *s, void *v)
2706{
2707 struct list_head *list = v;
2708 struct smack_known_list_elem *sklep =
2709 list_entry(list, struct smack_known_list_elem, list);
2710
2711 seq_puts(s, sklep->smk_label->smk_known);
2712 seq_putc(s, ' ');
2713
2714 return 0;
2715}
2716
2717static const struct seq_operations relabel_self_seq_ops = {
2718 .start = relabel_self_seq_start,
2719 .next = relabel_self_seq_next,
2720 .show = relabel_self_seq_show,
2721 .stop = smk_seq_stop,
2722};
2723
2724/**
2725 * smk_open_relabel_self - open() for /smack/relabel-self
2726 * @inode: inode structure representing file
2727 * @file: "relabel-self" file pointer
2728 *
2729 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2730 * file_operations
2731 */
2732static int smk_open_relabel_self(struct inode *inode, struct file *file)
2733{
2734 return seq_open(file, &relabel_self_seq_ops);
2735}
2736
2737/**
2738 * smk_write_relabel_self - write() for /smack/relabel-self
2739 * @file: file pointer, not actually used
2740 * @buf: where to get the data from
2741 * @count: bytes sent
2742 * @ppos: where to start - must be 0
2743 *
2744 */
2745static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2746 size_t count, loff_t *ppos)
2747{
2748 char *data;
2749 int rc;
2750 LIST_HEAD(list_tmp);
2751
2752 /*
2753 * Must have privilege.
2754 */
2755 if (!smack_privileged(CAP_MAC_ADMIN))
2756 return -EPERM;
2757
2758 /*
2759 * No partial write.
2760 * Enough data must be present.
2761 */
2762 if (*ppos != 0)
2763 return -EINVAL;
2764 if (count == 0 || count > PAGE_SIZE)
2765 return -EINVAL;
2766
2767 data = memdup_user_nul(buf, count);
2768 if (IS_ERR(data))
2769 return PTR_ERR(data);
2770
2771 rc = smk_parse_label_list(data, &list_tmp);
2772 kfree(data);
2773
2774 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2775 struct cred *new;
2776 struct task_smack *tsp;
2777
2778 new = prepare_creds();
2779 if (!new) {
2780 rc = -ENOMEM;
2781 goto out;
2782 }
2783 tsp = smack_cred(new);
2784 smk_destroy_label_list(&tsp->smk_relabel);
2785 list_splice(&list_tmp, &tsp->smk_relabel);
2786 commit_creds(new);
2787 return count;
2788 }
2789out:
2790 smk_destroy_label_list(&list_tmp);
2791 return rc;
2792}
2793
2794static const struct file_operations smk_relabel_self_ops = {
2795 .open = smk_open_relabel_self,
2796 .read = seq_read,
2797 .llseek = seq_lseek,
2798 .write = smk_write_relabel_self,
2799 .release = seq_release,
2800};
2801
2802/**
2803 * smk_read_ptrace - read() for /smack/ptrace
2804 * @filp: file pointer, not actually used
2805 * @buf: where to put the result
2806 * @count: maximum to send along
2807 * @ppos: where to start
2808 *
2809 * Returns number of bytes read or error code, as appropriate
2810 */
2811static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2812 size_t count, loff_t *ppos)
2813{
2814 char temp[32];
2815 ssize_t rc;
2816
2817 if (*ppos != 0)
2818 return 0;
2819
2820 sprintf(temp, "%d\n", smack_ptrace_rule);
2821 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2822 return rc;
2823}
2824
2825/**
2826 * smk_write_ptrace - write() for /smack/ptrace
2827 * @file: file pointer
2828 * @buf: data from user space
2829 * @count: bytes sent
2830 * @ppos: where to start - must be 0
2831 */
2832static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2833 size_t count, loff_t *ppos)
2834{
2835 char temp[32];
2836 int i;
2837
2838 if (!smack_privileged(CAP_MAC_ADMIN))
2839 return -EPERM;
2840
2841 if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2842 return -EINVAL;
2843
2844 if (copy_from_user(temp, buf, count) != 0)
2845 return -EFAULT;
2846
2847 temp[count] = '\0';
2848
2849 if (sscanf(temp, "%d", &i) != 1)
2850 return -EINVAL;
2851 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2852 return -EINVAL;
2853 smack_ptrace_rule = i;
2854
2855 return count;
2856}
2857
2858static const struct file_operations smk_ptrace_ops = {
2859 .write = smk_write_ptrace,
2860 .read = smk_read_ptrace,
2861 .llseek = default_llseek,
2862};
2863
2864/**
2865 * smk_fill_super - fill the smackfs superblock
2866 * @sb: the empty superblock
2867 * @fc: unused
2868 *
2869 * Fill in the well known entries for the smack filesystem
2870 *
2871 * Returns 0 on success, an error code on failure
2872 */
2873static int smk_fill_super(struct super_block *sb, struct fs_context *fc)
2874{
2875 int rc;
2876
2877 static const struct tree_descr smack_files[] = {
2878 [SMK_LOAD] = {
2879 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2880 [SMK_CIPSO] = {
2881 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2882 [SMK_DOI] = {
2883 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2884 [SMK_DIRECT] = {
2885 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2886 [SMK_AMBIENT] = {
2887 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2888 [SMK_NET4ADDR] = {
2889 "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2890 [SMK_ONLYCAP] = {
2891 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2892 [SMK_LOGGING] = {
2893 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2894 [SMK_LOAD_SELF] = {
2895 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2896 [SMK_ACCESSES] = {
2897 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2898 [SMK_MAPPED] = {
2899 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2900 [SMK_LOAD2] = {
2901 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2902 [SMK_LOAD_SELF2] = {
2903 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2904 [SMK_ACCESS2] = {
2905 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2906 [SMK_CIPSO2] = {
2907 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2908 [SMK_REVOKE_SUBJ] = {
2909 "revoke-subject", &smk_revoke_subj_ops,
2910 S_IRUGO|S_IWUSR},
2911 [SMK_CHANGE_RULE] = {
2912 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2913 [SMK_SYSLOG] = {
2914 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2915 [SMK_PTRACE] = {
2916 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2917#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2918 [SMK_UNCONFINED] = {
2919 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2920#endif
2921#if IS_ENABLED(CONFIG_IPV6)
2922 [SMK_NET6ADDR] = {
2923 "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2924#endif /* CONFIG_IPV6 */
2925 [SMK_RELABEL_SELF] = {
2926 "relabel-self", &smk_relabel_self_ops,
2927 S_IRUGO|S_IWUGO},
2928 /* last one */
2929 {""}
2930 };
2931
2932 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2933 if (rc != 0) {
2934 printk(KERN_ERR "%s failed %d while creating inodes\n",
2935 __func__, rc);
2936 return rc;
2937 }
2938
2939 return 0;
2940}
2941
2942/**
2943 * smk_get_tree - get the smackfs superblock
2944 * @fc: The mount context, including any options
2945 *
2946 * Just passes everything along.
2947 *
2948 * Returns what the lower level code does.
2949 */
2950static int smk_get_tree(struct fs_context *fc)
2951{
2952 return get_tree_single(fc, smk_fill_super);
2953}
2954
2955static const struct fs_context_operations smk_context_ops = {
2956 .get_tree = smk_get_tree,
2957};
2958
2959/**
2960 * smk_init_fs_context - Initialise a filesystem context for smackfs
2961 * @fc: The blank mount context
2962 */
2963static int smk_init_fs_context(struct fs_context *fc)
2964{
2965 fc->ops = &smk_context_ops;
2966 return 0;
2967}
2968
2969static struct file_system_type smk_fs_type = {
2970 .name = "smackfs",
2971 .init_fs_context = smk_init_fs_context,
2972 .kill_sb = kill_litter_super,
2973};
2974
2975static struct vfsmount *smackfs_mount;
2976
2977/**
2978 * init_smk_fs - get the smackfs superblock
2979 *
2980 * register the smackfs
2981 *
2982 * Do not register smackfs if Smack wasn't enabled
2983 * on boot. We can not put this method normally under the
2984 * smack_init() code path since the security subsystem get
2985 * initialized before the vfs caches.
2986 *
2987 * Returns true if we were not chosen on boot or if
2988 * we were chosen and filesystem registration succeeded.
2989 */
2990static int __init init_smk_fs(void)
2991{
2992 int err;
2993 int rc;
2994
2995 if (smack_enabled == 0)
2996 return 0;
2997
2998 err = smk_init_sysfs();
2999 if (err)
3000 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
3001
3002 err = register_filesystem(&smk_fs_type);
3003 if (!err) {
3004 smackfs_mount = kern_mount(&smk_fs_type);
3005 if (IS_ERR(smackfs_mount)) {
3006 printk(KERN_ERR "smackfs: could not mount!\n");
3007 err = PTR_ERR(smackfs_mount);
3008 smackfs_mount = NULL;
3009 }
3010 }
3011
3012 smk_cipso_doi();
3013 smk_unlbl_ambient(NULL);
3014
3015 rc = smack_populate_secattr(&smack_known_floor);
3016 if (err == 0 && rc < 0)
3017 err = rc;
3018 rc = smack_populate_secattr(&smack_known_hat);
3019 if (err == 0 && rc < 0)
3020 err = rc;
3021 rc = smack_populate_secattr(&smack_known_huh);
3022 if (err == 0 && rc < 0)
3023 err = rc;
3024 rc = smack_populate_secattr(&smack_known_star);
3025 if (err == 0 && rc < 0)
3026 err = rc;
3027 rc = smack_populate_secattr(&smack_known_web);
3028 if (err == 0 && rc < 0)
3029 err = rc;
3030
3031 return err;
3032}
3033
3034__initcall(init_smk_fs);