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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/mount.h>
27#include <linux/fs_context.h>
28#include "smack.h"
29
30#define BEBITS (sizeof(__be32) * 8)
31/*
32 * smackfs pseudo filesystem.
33 */
34
35enum smk_inos {
36 SMK_ROOT_INO = 2,
37 SMK_LOAD = 3, /* load policy */
38 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
39 SMK_DOI = 5, /* CIPSO DOI */
40 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
41 SMK_AMBIENT = 7, /* internet ambient label */
42 SMK_NET4ADDR = 8, /* single label hosts */
43 SMK_ONLYCAP = 9, /* the only "capable" label */
44 SMK_LOGGING = 10, /* logging */
45 SMK_LOAD_SELF = 11, /* task specific rules */
46 SMK_ACCESSES = 12, /* access policy */
47 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
48 SMK_LOAD2 = 14, /* load policy with long labels */
49 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
50 SMK_ACCESS2 = 16, /* make an access check with long labels */
51 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
52 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
53 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
54 SMK_SYSLOG = 20, /* change syslog label) */
55 SMK_PTRACE = 21, /* set ptrace rule */
56#ifdef CONFIG_SECURITY_SMACK_BRINGUP
57 SMK_UNCONFINED = 22, /* define an unconfined label */
58#endif
59#if IS_ENABLED(CONFIG_IPV6)
60 SMK_NET6ADDR = 23, /* single label IPv6 hosts */
61#endif /* CONFIG_IPV6 */
62 SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
63};
64
65/*
66 * List locks
67 */
68static DEFINE_MUTEX(smack_cipso_lock);
69static DEFINE_MUTEX(smack_ambient_lock);
70static DEFINE_MUTEX(smk_net4addr_lock);
71#if IS_ENABLED(CONFIG_IPV6)
72static DEFINE_MUTEX(smk_net6addr_lock);
73#endif /* CONFIG_IPV6 */
74
75/*
76 * This is the "ambient" label for network traffic.
77 * If it isn't somehow marked, use this.
78 * It can be reset via smackfs/ambient
79 */
80struct smack_known *smack_net_ambient;
81
82/*
83 * This is the level in a CIPSO header that indicates a
84 * smack label is contained directly in the category set.
85 * It can be reset via smackfs/direct
86 */
87int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
88
89/*
90 * This is the level in a CIPSO header that indicates a
91 * secid is contained directly in the category set.
92 * It can be reset via smackfs/mapped
93 */
94int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
95
96#ifdef CONFIG_SECURITY_SMACK_BRINGUP
97/*
98 * Allow one label to be unconfined. This is for
99 * debugging and application bring-up purposes only.
100 * It is bad and wrong, but everyone seems to expect
101 * to have it.
102 */
103struct smack_known *smack_unconfined;
104#endif
105
106/*
107 * If this value is set restrict syslog use to the label specified.
108 * It can be reset via smackfs/syslog
109 */
110struct smack_known *smack_syslog_label;
111
112/*
113 * Ptrace current rule
114 * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
115 * SMACK_PTRACE_EXACT labels must match, but can be overriden with
116 * CAP_SYS_PTRACE
117 * SMACK_PTRACE_DRACONIAN labels must match, CAP_SYS_PTRACE has no effect
118 */
119int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
120
121/*
122 * Certain IP addresses may be designated as single label hosts.
123 * Packets are sent there unlabeled, but only from tasks that
124 * can write to the specified label.
125 */
126
127LIST_HEAD(smk_net4addr_list);
128#if IS_ENABLED(CONFIG_IPV6)
129LIST_HEAD(smk_net6addr_list);
130#endif /* CONFIG_IPV6 */
131
132/*
133 * Rule lists are maintained for each label.
134 */
135struct smack_parsed_rule {
136 struct smack_known *smk_subject;
137 struct smack_known *smk_object;
138 int smk_access1;
139 int smk_access2;
140};
141
142static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
143
144/*
145 * Values for parsing cipso rules
146 * SMK_DIGITLEN: Length of a digit field in a rule.
147 * SMK_CIPSOMIN: Minimum possible cipso rule length.
148 * SMK_CIPSOMAX: Maximum possible cipso rule length.
149 */
150#define SMK_DIGITLEN 4
151#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
152#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
153
154/*
155 * Values for parsing MAC rules
156 * SMK_ACCESS: Maximum possible combination of access permissions
157 * SMK_ACCESSLEN: Maximum length for a rule access field
158 * SMK_LOADLEN: Smack rule length
159 */
160#define SMK_OACCESS "rwxa"
161#define SMK_ACCESS "rwxatl"
162#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
163#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
164#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
165#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
166
167/*
168 * Stricly for CIPSO level manipulation.
169 * Set the category bit number in a smack label sized buffer.
170 */
171static inline void smack_catset_bit(unsigned int cat, char *catsetp)
172{
173 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
174 return;
175
176 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
177}
178
179/**
180 * smk_netlabel_audit_set - fill a netlbl_audit struct
181 * @nap: structure to fill
182 */
183static void smk_netlabel_audit_set(struct netlbl_audit *nap)
184{
185 nap->loginuid = audit_get_loginuid(current);
186 nap->sessionid = audit_get_sessionid(current);
187 nap->prop.smack.skp = smk_of_current();
188}
189
190/*
191 * Value for parsing single label host rules
192 * "1.2.3.4 X"
193 */
194#define SMK_NETLBLADDRMIN 9
195
196/**
197 * smk_set_access - add a rule to the rule list or replace an old rule
198 * @srp: the rule to add or replace
199 * @rule_list: the list of rules
200 * @rule_lock: the rule list lock
201 *
202 * Looks through the current subject/object/access list for
203 * the subject/object pair and replaces the access that was
204 * there. If the pair isn't found add it with the specified
205 * access.
206 *
207 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
208 * during the allocation of the new pair to add.
209 */
210static int smk_set_access(struct smack_parsed_rule *srp,
211 struct list_head *rule_list,
212 struct mutex *rule_lock)
213{
214 struct smack_rule *sp;
215 int found = 0;
216 int rc = 0;
217
218 mutex_lock(rule_lock);
219
220 /*
221 * Because the object label is less likely to match
222 * than the subject label check it first
223 */
224 list_for_each_entry_rcu(sp, rule_list, list) {
225 if (sp->smk_object == srp->smk_object &&
226 sp->smk_subject == srp->smk_subject) {
227 found = 1;
228 sp->smk_access |= srp->smk_access1;
229 sp->smk_access &= ~srp->smk_access2;
230 break;
231 }
232 }
233
234 if (found == 0) {
235 sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL);
236 if (sp == NULL) {
237 rc = -ENOMEM;
238 goto out;
239 }
240
241 sp->smk_subject = srp->smk_subject;
242 sp->smk_object = srp->smk_object;
243 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
244
245 list_add_rcu(&sp->list, rule_list);
246 }
247
248out:
249 mutex_unlock(rule_lock);
250 return rc;
251}
252
253/**
254 * smk_perm_from_str - parse smack accesses from a text string
255 * @string: a text string that contains a Smack accesses code
256 *
257 * Returns an integer with respective bits set for specified accesses.
258 */
259static int smk_perm_from_str(const char *string)
260{
261 int perm = 0;
262 const char *cp;
263
264 for (cp = string; ; cp++)
265 switch (*cp) {
266 case '-':
267 break;
268 case 'r':
269 case 'R':
270 perm |= MAY_READ;
271 break;
272 case 'w':
273 case 'W':
274 perm |= MAY_WRITE;
275 break;
276 case 'x':
277 case 'X':
278 perm |= MAY_EXEC;
279 break;
280 case 'a':
281 case 'A':
282 perm |= MAY_APPEND;
283 break;
284 case 't':
285 case 'T':
286 perm |= MAY_TRANSMUTE;
287 break;
288 case 'l':
289 case 'L':
290 perm |= MAY_LOCK;
291 break;
292 case 'b':
293 case 'B':
294 perm |= MAY_BRINGUP;
295 break;
296 default:
297 return perm;
298 }
299}
300
301/**
302 * smk_fill_rule - Fill Smack rule from strings
303 * @subject: subject label string
304 * @object: object label string
305 * @access1: access string
306 * @access2: string with permissions to be removed
307 * @rule: Smack rule
308 * @import: if non-zero, import labels
309 * @len: label length limit
310 *
311 * Returns 0 on success, appropriate error code on failure.
312 */
313static int smk_fill_rule(const char *subject, const char *object,
314 const char *access1, const char *access2,
315 struct smack_parsed_rule *rule, int import,
316 int len)
317{
318 const char *cp;
319 struct smack_known *skp;
320
321 if (import) {
322 rule->smk_subject = smk_import_entry(subject, len);
323 if (IS_ERR(rule->smk_subject))
324 return PTR_ERR(rule->smk_subject);
325
326 rule->smk_object = smk_import_entry(object, len);
327 if (IS_ERR(rule->smk_object))
328 return PTR_ERR(rule->smk_object);
329 } else {
330 cp = smk_parse_smack(subject, len);
331 if (IS_ERR(cp))
332 return PTR_ERR(cp);
333 skp = smk_find_entry(cp);
334 kfree(cp);
335 if (skp == NULL)
336 return -ENOENT;
337 rule->smk_subject = skp;
338
339 cp = smk_parse_smack(object, len);
340 if (IS_ERR(cp))
341 return PTR_ERR(cp);
342 skp = smk_find_entry(cp);
343 kfree(cp);
344 if (skp == NULL)
345 return -ENOENT;
346 rule->smk_object = skp;
347 }
348
349 rule->smk_access1 = smk_perm_from_str(access1);
350 if (access2)
351 rule->smk_access2 = smk_perm_from_str(access2);
352 else
353 rule->smk_access2 = ~rule->smk_access1;
354
355 return 0;
356}
357
358/**
359 * smk_parse_rule - parse Smack rule from load string
360 * @data: string to be parsed whose size is SMK_LOADLEN
361 * @rule: Smack rule
362 * @import: if non-zero, import labels
363 *
364 * Returns 0 on success, -1 on errors.
365 */
366static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
367 int import)
368{
369 int rc;
370
371 rc = smk_fill_rule(data, data + SMK_LABELLEN,
372 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
373 import, SMK_LABELLEN);
374 return rc;
375}
376
377/**
378 * smk_parse_long_rule - parse Smack rule from rule string
379 * @data: string to be parsed, null terminated
380 * @rule: Will be filled with Smack parsed rule
381 * @import: if non-zero, import labels
382 * @tokens: number of substrings expected in data
383 *
384 * Returns number of processed bytes on success, -ERRNO on failure.
385 */
386static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
387 int import, int tokens)
388{
389 ssize_t cnt = 0;
390 char *tok[4];
391 int rc;
392 int i;
393
394 /*
395 * Parsing the rule in-place, filling all white-spaces with '\0'
396 */
397 for (i = 0; i < tokens; ++i) {
398 while (isspace(data[cnt]))
399 data[cnt++] = '\0';
400
401 if (data[cnt] == '\0')
402 /* Unexpected end of data */
403 return -EINVAL;
404
405 tok[i] = data + cnt;
406
407 while (data[cnt] && !isspace(data[cnt]))
408 ++cnt;
409 }
410 while (isspace(data[cnt]))
411 data[cnt++] = '\0';
412
413 while (i < 4)
414 tok[i++] = NULL;
415
416 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
417 return rc == 0 ? cnt : rc;
418}
419
420#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
421#define SMK_LONG_FMT 1 /* Variable long label format */
422#define SMK_CHANGE_FMT 2 /* Rule modification format */
423/**
424 * smk_write_rules_list - write() for any /smack rule file
425 * @file: file pointer, not actually used
426 * @buf: where to get the data from
427 * @count: bytes sent
428 * @ppos: where to start - must be 0
429 * @rule_list: the list of rules to write to
430 * @rule_lock: lock for the rule list
431 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
432 *
433 * Get one smack access rule from above.
434 * The format for SMK_LONG_FMT is:
435 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
436 * The format for SMK_FIXED24_FMT is exactly:
437 * "subject object rwxat"
438 * The format for SMK_CHANGE_FMT is:
439 * "subject<whitespace>object<whitespace>
440 * acc_enable<whitespace>acc_disable[<whitespace>...]"
441 */
442static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
443 size_t count, loff_t *ppos,
444 struct list_head *rule_list,
445 struct mutex *rule_lock, int format)
446{
447 struct smack_parsed_rule rule;
448 char *data;
449 int rc;
450 int trunc = 0;
451 int tokens;
452 ssize_t cnt = 0;
453
454 /*
455 * No partial writes.
456 * Enough data must be present.
457 */
458 if (*ppos != 0)
459 return -EINVAL;
460
461 if (format == SMK_FIXED24_FMT) {
462 /*
463 * Minor hack for backward compatibility
464 */
465 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
466 return -EINVAL;
467 } else {
468 if (count >= PAGE_SIZE) {
469 count = PAGE_SIZE - 1;
470 trunc = 1;
471 }
472 }
473
474 data = memdup_user_nul(buf, count);
475 if (IS_ERR(data))
476 return PTR_ERR(data);
477
478 /*
479 * In case of parsing only part of user buf,
480 * avoid having partial rule at the data buffer
481 */
482 if (trunc) {
483 while (count > 0 && (data[count - 1] != '\n'))
484 --count;
485 if (count == 0) {
486 rc = -EINVAL;
487 goto out;
488 }
489 }
490
491 data[count] = '\0';
492 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
493 while (cnt < count) {
494 if (format == SMK_FIXED24_FMT) {
495 rc = smk_parse_rule(data, &rule, 1);
496 if (rc < 0)
497 goto out;
498 cnt = count;
499 } else {
500 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
501 if (rc < 0)
502 goto out;
503 if (rc == 0) {
504 rc = -EINVAL;
505 goto out;
506 }
507 cnt += rc;
508 }
509
510 if (rule_list == NULL)
511 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
512 &rule.smk_subject->smk_rules_lock);
513 else
514 rc = smk_set_access(&rule, rule_list, rule_lock);
515
516 if (rc)
517 goto out;
518 }
519
520 rc = cnt;
521out:
522 kfree(data);
523 return rc;
524}
525
526/*
527 * Core logic for smackfs seq list operations.
528 */
529
530static void *smk_seq_start(struct seq_file *s, loff_t *pos,
531 struct list_head *head)
532{
533 struct list_head *list;
534 int i = *pos;
535
536 rcu_read_lock();
537 for (list = rcu_dereference(list_next_rcu(head));
538 list != head;
539 list = rcu_dereference(list_next_rcu(list))) {
540 if (i-- == 0)
541 return list;
542 }
543
544 return NULL;
545}
546
547static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
548 struct list_head *head)
549{
550 struct list_head *list = v;
551
552 ++*pos;
553 list = rcu_dereference(list_next_rcu(list));
554
555 return (list == head) ? NULL : list;
556}
557
558static void smk_seq_stop(struct seq_file *s, void *v)
559{
560 rcu_read_unlock();
561}
562
563static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
564{
565 /*
566 * Don't show any rules with label names too long for
567 * interface file (/smack/load or /smack/load2)
568 * because you should expect to be able to write
569 * anything you read back.
570 */
571 if (strlen(srp->smk_subject->smk_known) >= max ||
572 strlen(srp->smk_object->smk_known) >= max)
573 return;
574
575 if (srp->smk_access == 0)
576 return;
577
578 seq_printf(s, "%s %s",
579 srp->smk_subject->smk_known,
580 srp->smk_object->smk_known);
581
582 seq_putc(s, ' ');
583
584 if (srp->smk_access & MAY_READ)
585 seq_putc(s, 'r');
586 if (srp->smk_access & MAY_WRITE)
587 seq_putc(s, 'w');
588 if (srp->smk_access & MAY_EXEC)
589 seq_putc(s, 'x');
590 if (srp->smk_access & MAY_APPEND)
591 seq_putc(s, 'a');
592 if (srp->smk_access & MAY_TRANSMUTE)
593 seq_putc(s, 't');
594 if (srp->smk_access & MAY_LOCK)
595 seq_putc(s, 'l');
596 if (srp->smk_access & MAY_BRINGUP)
597 seq_putc(s, 'b');
598
599 seq_putc(s, '\n');
600}
601
602/*
603 * Seq_file read operations for /smack/load
604 */
605
606static void *load2_seq_start(struct seq_file *s, loff_t *pos)
607{
608 return smk_seq_start(s, pos, &smack_known_list);
609}
610
611static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
612{
613 return smk_seq_next(s, v, pos, &smack_known_list);
614}
615
616static int load_seq_show(struct seq_file *s, void *v)
617{
618 struct list_head *list = v;
619 struct smack_rule *srp;
620 struct smack_known *skp =
621 list_entry_rcu(list, struct smack_known, list);
622
623 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
624 smk_rule_show(s, srp, SMK_LABELLEN);
625
626 return 0;
627}
628
629static const struct seq_operations load_seq_ops = {
630 .start = load2_seq_start,
631 .next = load2_seq_next,
632 .show = load_seq_show,
633 .stop = smk_seq_stop,
634};
635
636/**
637 * smk_open_load - open() for /smack/load
638 * @inode: inode structure representing file
639 * @file: "load" file pointer
640 *
641 * For reading, use load_seq_* seq_file reading operations.
642 */
643static int smk_open_load(struct inode *inode, struct file *file)
644{
645 return seq_open(file, &load_seq_ops);
646}
647
648/**
649 * smk_write_load - write() for /smack/load
650 * @file: file pointer, not actually used
651 * @buf: where to get the data from
652 * @count: bytes sent
653 * @ppos: where to start - must be 0
654 *
655 */
656static ssize_t smk_write_load(struct file *file, const char __user *buf,
657 size_t count, loff_t *ppos)
658{
659 /*
660 * Must have privilege.
661 * No partial writes.
662 * Enough data must be present.
663 */
664 if (!smack_privileged(CAP_MAC_ADMIN))
665 return -EPERM;
666
667 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
668 SMK_FIXED24_FMT);
669}
670
671static const struct file_operations smk_load_ops = {
672 .open = smk_open_load,
673 .read = seq_read,
674 .llseek = seq_lseek,
675 .write = smk_write_load,
676 .release = seq_release,
677};
678
679/**
680 * smk_cipso_doi - initialize the CIPSO domain
681 */
682static void smk_cipso_doi(void)
683{
684 int rc;
685 struct cipso_v4_doi *doip;
686 struct netlbl_audit nai;
687
688 smk_netlabel_audit_set(&nai);
689
690 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
691 if (rc != 0)
692 printk(KERN_WARNING "%s:%d remove rc = %d\n",
693 __func__, __LINE__, rc);
694
695 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL | __GFP_NOFAIL);
696 doip->map.std = NULL;
697 doip->doi = smk_cipso_doi_value;
698 doip->type = CIPSO_V4_MAP_PASS;
699 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
700 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
701 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
702
703 rc = netlbl_cfg_cipsov4_add(doip, &nai);
704 if (rc != 0) {
705 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
706 __func__, __LINE__, rc);
707 kfree(doip);
708 return;
709 }
710 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
711 if (rc != 0) {
712 printk(KERN_WARNING "%s:%d map add rc = %d\n",
713 __func__, __LINE__, rc);
714 netlbl_cfg_cipsov4_del(doip->doi, &nai);
715 return;
716 }
717}
718
719/**
720 * smk_unlbl_ambient - initialize the unlabeled domain
721 * @oldambient: previous domain string
722 */
723static void smk_unlbl_ambient(char *oldambient)
724{
725 int rc;
726 struct netlbl_audit nai;
727
728 smk_netlabel_audit_set(&nai);
729
730 if (oldambient != NULL) {
731 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
732 if (rc != 0)
733 printk(KERN_WARNING "%s:%d remove rc = %d\n",
734 __func__, __LINE__, rc);
735 }
736 if (smack_net_ambient == NULL)
737 smack_net_ambient = &smack_known_floor;
738
739 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
740 NULL, NULL, &nai);
741 if (rc != 0)
742 printk(KERN_WARNING "%s:%d add rc = %d\n",
743 __func__, __LINE__, rc);
744}
745
746/*
747 * Seq_file read operations for /smack/cipso
748 */
749
750static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
751{
752 return smk_seq_start(s, pos, &smack_known_list);
753}
754
755static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
756{
757 return smk_seq_next(s, v, pos, &smack_known_list);
758}
759
760/*
761 * Print cipso labels in format:
762 * label level[/cat[,cat]]
763 */
764static int cipso_seq_show(struct seq_file *s, void *v)
765{
766 struct list_head *list = v;
767 struct smack_known *skp =
768 list_entry_rcu(list, struct smack_known, list);
769 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
770 char sep = '/';
771 int i;
772
773 /*
774 * Don't show a label that could not have been set using
775 * /smack/cipso. This is in support of the notion that
776 * anything read from /smack/cipso ought to be writeable
777 * to /smack/cipso.
778 *
779 * /smack/cipso2 should be used instead.
780 */
781 if (strlen(skp->smk_known) >= SMK_LABELLEN)
782 return 0;
783
784 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
785
786 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
787 i = netlbl_catmap_walk(cmp, i + 1)) {
788 seq_printf(s, "%c%d", sep, i);
789 sep = ',';
790 }
791
792 seq_putc(s, '\n');
793
794 return 0;
795}
796
797static const struct seq_operations cipso_seq_ops = {
798 .start = cipso_seq_start,
799 .next = cipso_seq_next,
800 .show = cipso_seq_show,
801 .stop = smk_seq_stop,
802};
803
804/**
805 * smk_open_cipso - open() for /smack/cipso
806 * @inode: inode structure representing file
807 * @file: "cipso" file pointer
808 *
809 * Connect our cipso_seq_* operations with /smack/cipso
810 * file_operations
811 */
812static int smk_open_cipso(struct inode *inode, struct file *file)
813{
814 return seq_open(file, &cipso_seq_ops);
815}
816
817/**
818 * smk_set_cipso - do the work for write() for cipso and cipso2
819 * @file: file pointer, not actually used
820 * @buf: where to get the data from
821 * @count: bytes sent
822 * @ppos: where to start
823 * @format: /smack/cipso or /smack/cipso2
824 *
825 * Accepts only one cipso rule per write call.
826 * Returns number of bytes written or error code, as appropriate
827 */
828static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
829 size_t count, loff_t *ppos, int format)
830{
831 struct netlbl_lsm_catmap *old_cat, *new_cat = NULL;
832 struct smack_known *skp;
833 struct netlbl_lsm_secattr ncats;
834 char mapcatset[SMK_CIPSOLEN];
835 int maplevel;
836 unsigned int cat;
837 int catlen;
838 ssize_t rc = -EINVAL;
839 char *data = NULL;
840 char *rule;
841 int ret;
842 int i;
843
844 /*
845 * Must have privilege.
846 * No partial writes.
847 * Enough data must be present.
848 */
849 if (!smack_privileged(CAP_MAC_ADMIN))
850 return -EPERM;
851 if (*ppos != 0)
852 return -EINVAL;
853 if (format == SMK_FIXED24_FMT &&
854 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
855 return -EINVAL;
856 if (count > PAGE_SIZE)
857 return -EINVAL;
858
859 data = memdup_user_nul(buf, count);
860 if (IS_ERR(data))
861 return PTR_ERR(data);
862
863 rule = data;
864 /*
865 * Only allow one writer at a time. Writes should be
866 * quite rare and small in any case.
867 */
868 mutex_lock(&smack_cipso_lock);
869
870 skp = smk_import_entry(rule, 0);
871 if (IS_ERR(skp)) {
872 rc = PTR_ERR(skp);
873 goto out;
874 }
875
876 if (format == SMK_FIXED24_FMT)
877 rule += SMK_LABELLEN;
878 else
879 rule += strlen(skp->smk_known) + 1;
880
881 if (rule > data + count) {
882 rc = -EOVERFLOW;
883 goto out;
884 }
885
886 ret = sscanf(rule, "%d", &maplevel);
887 if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL)
888 goto out;
889
890 rule += SMK_DIGITLEN;
891 if (rule > data + count) {
892 rc = -EOVERFLOW;
893 goto out;
894 }
895
896 ret = sscanf(rule, "%d", &catlen);
897 if (ret != 1 || catlen < 0 || catlen > SMACK_CIPSO_MAXCATNUM)
898 goto out;
899
900 if (format == SMK_FIXED24_FMT &&
901 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
902 goto out;
903
904 memset(mapcatset, 0, sizeof(mapcatset));
905
906 for (i = 0; i < catlen; i++) {
907 rule += SMK_DIGITLEN;
908 if (rule > data + count) {
909 rc = -EOVERFLOW;
910 goto out;
911 }
912 ret = sscanf(rule, "%u", &cat);
913 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
914 goto out;
915
916 smack_catset_bit(cat, mapcatset);
917 }
918 ncats.flags = 0;
919 if (catlen == 0) {
920 ncats.attr.mls.cat = NULL;
921 ncats.attr.mls.lvl = maplevel;
922 new_cat = netlbl_catmap_alloc(GFP_ATOMIC);
923 if (new_cat)
924 new_cat->next = ncats.attr.mls.cat;
925 ncats.attr.mls.cat = new_cat;
926 skp->smk_netlabel.flags &= ~(1U << 3);
927 rc = 0;
928 } else {
929 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
930 }
931 if (rc >= 0) {
932 old_cat = skp->smk_netlabel.attr.mls.cat;
933 rcu_assign_pointer(skp->smk_netlabel.attr.mls.cat, ncats.attr.mls.cat);
934 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
935 synchronize_rcu();
936 netlbl_catmap_free(old_cat);
937 rc = count;
938 /*
939 * This mapping may have been cached, so clear the cache.
940 */
941 netlbl_cache_invalidate();
942 }
943
944out:
945 mutex_unlock(&smack_cipso_lock);
946 kfree(data);
947 return rc;
948}
949
950/**
951 * smk_write_cipso - write() for /smack/cipso
952 * @file: file pointer, not actually used
953 * @buf: where to get the data from
954 * @count: bytes sent
955 * @ppos: where to start
956 *
957 * Accepts only one cipso rule per write call.
958 * Returns number of bytes written or error code, as appropriate
959 */
960static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
961 size_t count, loff_t *ppos)
962{
963 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
964}
965
966static const struct file_operations smk_cipso_ops = {
967 .open = smk_open_cipso,
968 .read = seq_read,
969 .llseek = seq_lseek,
970 .write = smk_write_cipso,
971 .release = seq_release,
972};
973
974/*
975 * Seq_file read operations for /smack/cipso2
976 */
977
978/*
979 * Print cipso labels in format:
980 * label level[/cat[,cat]]
981 */
982static int cipso2_seq_show(struct seq_file *s, void *v)
983{
984 struct list_head *list = v;
985 struct smack_known *skp =
986 list_entry_rcu(list, struct smack_known, list);
987 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
988 char sep = '/';
989 int i;
990
991 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
992
993 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
994 i = netlbl_catmap_walk(cmp, i + 1)) {
995 seq_printf(s, "%c%d", sep, i);
996 sep = ',';
997 }
998
999 seq_putc(s, '\n');
1000
1001 return 0;
1002}
1003
1004static const struct seq_operations cipso2_seq_ops = {
1005 .start = cipso_seq_start,
1006 .next = cipso_seq_next,
1007 .show = cipso2_seq_show,
1008 .stop = smk_seq_stop,
1009};
1010
1011/**
1012 * smk_open_cipso2 - open() for /smack/cipso2
1013 * @inode: inode structure representing file
1014 * @file: "cipso2" file pointer
1015 *
1016 * Connect our cipso_seq_* operations with /smack/cipso2
1017 * file_operations
1018 */
1019static int smk_open_cipso2(struct inode *inode, struct file *file)
1020{
1021 return seq_open(file, &cipso2_seq_ops);
1022}
1023
1024/**
1025 * smk_write_cipso2 - write() for /smack/cipso2
1026 * @file: file pointer, not actually used
1027 * @buf: where to get the data from
1028 * @count: bytes sent
1029 * @ppos: where to start
1030 *
1031 * Accepts only one cipso rule per write call.
1032 * Returns number of bytes written or error code, as appropriate
1033 */
1034static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1035 size_t count, loff_t *ppos)
1036{
1037 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1038}
1039
1040static const struct file_operations smk_cipso2_ops = {
1041 .open = smk_open_cipso2,
1042 .read = seq_read,
1043 .llseek = seq_lseek,
1044 .write = smk_write_cipso2,
1045 .release = seq_release,
1046};
1047
1048/*
1049 * Seq_file read operations for /smack/netlabel
1050 */
1051
1052static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1053{
1054 return smk_seq_start(s, pos, &smk_net4addr_list);
1055}
1056
1057static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1058{
1059 return smk_seq_next(s, v, pos, &smk_net4addr_list);
1060}
1061
1062/*
1063 * Print host/label pairs
1064 */
1065static int net4addr_seq_show(struct seq_file *s, void *v)
1066{
1067 struct list_head *list = v;
1068 struct smk_net4addr *skp =
1069 list_entry_rcu(list, struct smk_net4addr, list);
1070 char *kp = SMACK_CIPSO_OPTION;
1071
1072 if (skp->smk_label != NULL)
1073 kp = skp->smk_label->smk_known;
1074 seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1075 skp->smk_masks, kp);
1076
1077 return 0;
1078}
1079
1080static const struct seq_operations net4addr_seq_ops = {
1081 .start = net4addr_seq_start,
1082 .next = net4addr_seq_next,
1083 .show = net4addr_seq_show,
1084 .stop = smk_seq_stop,
1085};
1086
1087/**
1088 * smk_open_net4addr - open() for /smack/netlabel
1089 * @inode: inode structure representing file
1090 * @file: "netlabel" file pointer
1091 *
1092 * Connect our net4addr_seq_* operations with /smack/netlabel
1093 * file_operations
1094 */
1095static int smk_open_net4addr(struct inode *inode, struct file *file)
1096{
1097 return seq_open(file, &net4addr_seq_ops);
1098}
1099
1100/**
1101 * smk_net4addr_insert
1102 * @new : netlabel to insert
1103 *
1104 * This helper insert netlabel in the smack_net4addrs list
1105 * sorted by netmask length (longest to smallest)
1106 * locked by &smk_net4addr_lock in smk_write_net4addr
1107 *
1108 */
1109static void smk_net4addr_insert(struct smk_net4addr *new)
1110{
1111 struct smk_net4addr *m;
1112 struct smk_net4addr *m_next;
1113
1114 if (list_empty(&smk_net4addr_list)) {
1115 list_add_rcu(&new->list, &smk_net4addr_list);
1116 return;
1117 }
1118
1119 m = list_entry_rcu(smk_net4addr_list.next,
1120 struct smk_net4addr, list);
1121
1122 /* the comparison '>' is a bit hacky, but works */
1123 if (new->smk_masks > m->smk_masks) {
1124 list_add_rcu(&new->list, &smk_net4addr_list);
1125 return;
1126 }
1127
1128 list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1129 if (list_is_last(&m->list, &smk_net4addr_list)) {
1130 list_add_rcu(&new->list, &m->list);
1131 return;
1132 }
1133 m_next = list_entry_rcu(m->list.next,
1134 struct smk_net4addr, list);
1135 if (new->smk_masks > m_next->smk_masks) {
1136 list_add_rcu(&new->list, &m->list);
1137 return;
1138 }
1139 }
1140}
1141
1142
1143/**
1144 * smk_write_net4addr - write() for /smack/netlabel
1145 * @file: file pointer, not actually used
1146 * @buf: where to get the data from
1147 * @count: bytes sent
1148 * @ppos: where to start
1149 *
1150 * Accepts only one net4addr per write call.
1151 * Returns number of bytes written or error code, as appropriate
1152 */
1153static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1154 size_t count, loff_t *ppos)
1155{
1156 struct smk_net4addr *snp;
1157 struct sockaddr_in newname;
1158 char *smack;
1159 struct smack_known *skp = NULL;
1160 char *data;
1161 char *host = (char *)&newname.sin_addr.s_addr;
1162 int rc;
1163 struct netlbl_audit audit_info;
1164 struct in_addr mask;
1165 unsigned int m;
1166 unsigned int masks;
1167 int found;
1168 u32 mask_bits = (1<<31);
1169 __be32 nsa;
1170 u32 temp_mask;
1171
1172 /*
1173 * Must have privilege.
1174 * No partial writes.
1175 * Enough data must be present.
1176 * "<addr/mask, as a.b.c.d/e><space><label>"
1177 * "<addr, as a.b.c.d><space><label>"
1178 */
1179 if (!smack_privileged(CAP_MAC_ADMIN))
1180 return -EPERM;
1181 if (*ppos != 0)
1182 return -EINVAL;
1183 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1184 return -EINVAL;
1185
1186 data = memdup_user_nul(buf, count);
1187 if (IS_ERR(data))
1188 return PTR_ERR(data);
1189
1190 smack = kzalloc(count + 1, GFP_KERNEL);
1191 if (smack == NULL) {
1192 rc = -ENOMEM;
1193 goto free_data_out;
1194 }
1195
1196 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1197 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1198 if (rc != 6) {
1199 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1200 &host[0], &host[1], &host[2], &host[3], smack);
1201 if (rc != 5) {
1202 rc = -EINVAL;
1203 goto free_out;
1204 }
1205 masks = 32;
1206 }
1207 if (masks > BEBITS) {
1208 rc = -EINVAL;
1209 goto free_out;
1210 }
1211
1212 /*
1213 * If smack begins with '-', it is an option, don't import it
1214 */
1215 if (smack[0] != '-') {
1216 skp = smk_import_entry(smack, 0);
1217 if (IS_ERR(skp)) {
1218 rc = PTR_ERR(skp);
1219 goto free_out;
1220 }
1221 } else {
1222 /*
1223 * Only the -CIPSO option is supported for IPv4
1224 */
1225 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1226 rc = -EINVAL;
1227 goto free_out;
1228 }
1229 }
1230
1231 for (m = masks, temp_mask = 0; m > 0; m--) {
1232 temp_mask |= mask_bits;
1233 mask_bits >>= 1;
1234 }
1235 mask.s_addr = cpu_to_be32(temp_mask);
1236
1237 newname.sin_addr.s_addr &= mask.s_addr;
1238 /*
1239 * Only allow one writer at a time. Writes should be
1240 * quite rare and small in any case.
1241 */
1242 mutex_lock(&smk_net4addr_lock);
1243
1244 nsa = newname.sin_addr.s_addr;
1245 /* try to find if the prefix is already in the list */
1246 found = 0;
1247 list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1248 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1249 found = 1;
1250 break;
1251 }
1252 }
1253 smk_netlabel_audit_set(&audit_info);
1254
1255 if (found == 0) {
1256 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1257 if (snp == NULL)
1258 rc = -ENOMEM;
1259 else {
1260 rc = 0;
1261 snp->smk_host.s_addr = newname.sin_addr.s_addr;
1262 snp->smk_mask.s_addr = mask.s_addr;
1263 snp->smk_label = skp;
1264 snp->smk_masks = masks;
1265 smk_net4addr_insert(snp);
1266 }
1267 } else {
1268 /*
1269 * Delete the unlabeled entry, only if the previous label
1270 * wasn't the special CIPSO option
1271 */
1272 if (snp->smk_label != NULL)
1273 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1274 &snp->smk_host, &snp->smk_mask,
1275 PF_INET, &audit_info);
1276 else
1277 rc = 0;
1278 snp->smk_label = skp;
1279 }
1280
1281 /*
1282 * Now tell netlabel about the single label nature of
1283 * this host so that incoming packets get labeled.
1284 * but only if we didn't get the special CIPSO option
1285 */
1286 if (rc == 0 && skp != NULL)
1287 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1288 &snp->smk_host, &snp->smk_mask, PF_INET,
1289 snp->smk_label->smk_secid, &audit_info);
1290
1291 if (rc == 0)
1292 rc = count;
1293
1294 mutex_unlock(&smk_net4addr_lock);
1295
1296free_out:
1297 kfree(smack);
1298free_data_out:
1299 kfree(data);
1300
1301 return rc;
1302}
1303
1304static const struct file_operations smk_net4addr_ops = {
1305 .open = smk_open_net4addr,
1306 .read = seq_read,
1307 .llseek = seq_lseek,
1308 .write = smk_write_net4addr,
1309 .release = seq_release,
1310};
1311
1312#if IS_ENABLED(CONFIG_IPV6)
1313/*
1314 * Seq_file read operations for /smack/netlabel6
1315 */
1316
1317static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1318{
1319 return smk_seq_start(s, pos, &smk_net6addr_list);
1320}
1321
1322static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1323{
1324 return smk_seq_next(s, v, pos, &smk_net6addr_list);
1325}
1326
1327/*
1328 * Print host/label pairs
1329 */
1330static int net6addr_seq_show(struct seq_file *s, void *v)
1331{
1332 struct list_head *list = v;
1333 struct smk_net6addr *skp =
1334 list_entry(list, struct smk_net6addr, list);
1335
1336 if (skp->smk_label != NULL)
1337 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1338 skp->smk_label->smk_known);
1339
1340 return 0;
1341}
1342
1343static const struct seq_operations net6addr_seq_ops = {
1344 .start = net6addr_seq_start,
1345 .next = net6addr_seq_next,
1346 .show = net6addr_seq_show,
1347 .stop = smk_seq_stop,
1348};
1349
1350/**
1351 * smk_open_net6addr - open() for /smack/netlabel
1352 * @inode: inode structure representing file
1353 * @file: "netlabel" file pointer
1354 *
1355 * Connect our net6addr_seq_* operations with /smack/netlabel
1356 * file_operations
1357 */
1358static int smk_open_net6addr(struct inode *inode, struct file *file)
1359{
1360 return seq_open(file, &net6addr_seq_ops);
1361}
1362
1363/**
1364 * smk_net6addr_insert
1365 * @new : entry to insert
1366 *
1367 * This inserts an entry in the smack_net6addrs list
1368 * sorted by netmask length (longest to smallest)
1369 * locked by &smk_net6addr_lock in smk_write_net6addr
1370 *
1371 */
1372static void smk_net6addr_insert(struct smk_net6addr *new)
1373{
1374 struct smk_net6addr *m_next;
1375 struct smk_net6addr *m;
1376
1377 if (list_empty(&smk_net6addr_list)) {
1378 list_add_rcu(&new->list, &smk_net6addr_list);
1379 return;
1380 }
1381
1382 m = list_entry_rcu(smk_net6addr_list.next,
1383 struct smk_net6addr, list);
1384
1385 if (new->smk_masks > m->smk_masks) {
1386 list_add_rcu(&new->list, &smk_net6addr_list);
1387 return;
1388 }
1389
1390 list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1391 if (list_is_last(&m->list, &smk_net6addr_list)) {
1392 list_add_rcu(&new->list, &m->list);
1393 return;
1394 }
1395 m_next = list_entry_rcu(m->list.next,
1396 struct smk_net6addr, list);
1397 if (new->smk_masks > m_next->smk_masks) {
1398 list_add_rcu(&new->list, &m->list);
1399 return;
1400 }
1401 }
1402}
1403
1404
1405/**
1406 * smk_write_net6addr - write() for /smack/netlabel
1407 * @file: file pointer, not actually used
1408 * @buf: where to get the data from
1409 * @count: bytes sent
1410 * @ppos: where to start
1411 *
1412 * Accepts only one net6addr per write call.
1413 * Returns number of bytes written or error code, as appropriate
1414 */
1415static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1416 size_t count, loff_t *ppos)
1417{
1418 struct smk_net6addr *snp;
1419 struct in6_addr newname;
1420 struct in6_addr fullmask;
1421 struct smack_known *skp = NULL;
1422 char *smack;
1423 char *data;
1424 int rc = 0;
1425 int found = 0;
1426 int i;
1427 unsigned int scanned[8];
1428 unsigned int m;
1429 unsigned int mask = 128;
1430
1431 /*
1432 * Must have privilege.
1433 * No partial writes.
1434 * Enough data must be present.
1435 * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1436 * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1437 */
1438 if (!smack_privileged(CAP_MAC_ADMIN))
1439 return -EPERM;
1440 if (*ppos != 0)
1441 return -EINVAL;
1442 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1443 return -EINVAL;
1444
1445 data = memdup_user_nul(buf, count);
1446 if (IS_ERR(data))
1447 return PTR_ERR(data);
1448
1449 smack = kzalloc(count + 1, GFP_KERNEL);
1450 if (smack == NULL) {
1451 rc = -ENOMEM;
1452 goto free_data_out;
1453 }
1454
1455 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1456 &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1457 &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1458 &mask, smack);
1459 if (i != 10) {
1460 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1461 &scanned[0], &scanned[1], &scanned[2],
1462 &scanned[3], &scanned[4], &scanned[5],
1463 &scanned[6], &scanned[7], smack);
1464 if (i != 9) {
1465 rc = -EINVAL;
1466 goto free_out;
1467 }
1468 }
1469 if (mask > 128) {
1470 rc = -EINVAL;
1471 goto free_out;
1472 }
1473 for (i = 0; i < 8; i++) {
1474 if (scanned[i] > 0xffff) {
1475 rc = -EINVAL;
1476 goto free_out;
1477 }
1478 newname.s6_addr16[i] = htons(scanned[i]);
1479 }
1480
1481 /*
1482 * If smack begins with '-', it is an option, don't import it
1483 */
1484 if (smack[0] != '-') {
1485 skp = smk_import_entry(smack, 0);
1486 if (IS_ERR(skp)) {
1487 rc = PTR_ERR(skp);
1488 goto free_out;
1489 }
1490 } else {
1491 /*
1492 * Only -DELETE is supported for IPv6
1493 */
1494 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1495 rc = -EINVAL;
1496 goto free_out;
1497 }
1498 }
1499
1500 for (i = 0, m = mask; i < 8; i++) {
1501 if (m >= 16) {
1502 fullmask.s6_addr16[i] = 0xffff;
1503 m -= 16;
1504 } else if (m > 0) {
1505 fullmask.s6_addr16[i] = (1 << m) - 1;
1506 m = 0;
1507 } else
1508 fullmask.s6_addr16[i] = 0;
1509 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1510 }
1511
1512 /*
1513 * Only allow one writer at a time. Writes should be
1514 * quite rare and small in any case.
1515 */
1516 mutex_lock(&smk_net6addr_lock);
1517 /*
1518 * Try to find the prefix in the list
1519 */
1520 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1521 if (mask != snp->smk_masks)
1522 continue;
1523 for (found = 1, i = 0; i < 8; i++) {
1524 if (newname.s6_addr16[i] !=
1525 snp->smk_host.s6_addr16[i]) {
1526 found = 0;
1527 break;
1528 }
1529 }
1530 if (found == 1)
1531 break;
1532 }
1533 if (found == 0) {
1534 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1535 if (snp == NULL)
1536 rc = -ENOMEM;
1537 else {
1538 snp->smk_host = newname;
1539 snp->smk_mask = fullmask;
1540 snp->smk_masks = mask;
1541 snp->smk_label = skp;
1542 smk_net6addr_insert(snp);
1543 }
1544 } else {
1545 snp->smk_label = skp;
1546 }
1547
1548 if (rc == 0)
1549 rc = count;
1550
1551 mutex_unlock(&smk_net6addr_lock);
1552
1553free_out:
1554 kfree(smack);
1555free_data_out:
1556 kfree(data);
1557
1558 return rc;
1559}
1560
1561static const struct file_operations smk_net6addr_ops = {
1562 .open = smk_open_net6addr,
1563 .read = seq_read,
1564 .llseek = seq_lseek,
1565 .write = smk_write_net6addr,
1566 .release = seq_release,
1567};
1568#endif /* CONFIG_IPV6 */
1569
1570/**
1571 * smk_read_doi - read() for /smack/doi
1572 * @filp: file pointer, not actually used
1573 * @buf: where to put the result
1574 * @count: maximum to send along
1575 * @ppos: where to start
1576 *
1577 * Returns number of bytes read or error code, as appropriate
1578 */
1579static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1580 size_t count, loff_t *ppos)
1581{
1582 char temp[80];
1583 ssize_t rc;
1584
1585 if (*ppos != 0)
1586 return 0;
1587
1588 sprintf(temp, "%d", smk_cipso_doi_value);
1589 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1590
1591 return rc;
1592}
1593
1594/**
1595 * smk_write_doi - write() for /smack/doi
1596 * @file: file pointer, not actually used
1597 * @buf: where to get the data from
1598 * @count: bytes sent
1599 * @ppos: where to start
1600 *
1601 * Returns number of bytes written or error code, as appropriate
1602 */
1603static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1604 size_t count, loff_t *ppos)
1605{
1606 char temp[80];
1607 int i;
1608
1609 if (!smack_privileged(CAP_MAC_ADMIN))
1610 return -EPERM;
1611
1612 if (count >= sizeof(temp) || count == 0)
1613 return -EINVAL;
1614
1615 if (copy_from_user(temp, buf, count) != 0)
1616 return -EFAULT;
1617
1618 temp[count] = '\0';
1619
1620 if (sscanf(temp, "%d", &i) != 1)
1621 return -EINVAL;
1622
1623 smk_cipso_doi_value = i;
1624
1625 smk_cipso_doi();
1626
1627 return count;
1628}
1629
1630static const struct file_operations smk_doi_ops = {
1631 .read = smk_read_doi,
1632 .write = smk_write_doi,
1633 .llseek = default_llseek,
1634};
1635
1636/**
1637 * smk_read_direct - read() for /smack/direct
1638 * @filp: file pointer, not actually used
1639 * @buf: where to put the result
1640 * @count: maximum to send along
1641 * @ppos: where to start
1642 *
1643 * Returns number of bytes read or error code, as appropriate
1644 */
1645static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1646 size_t count, loff_t *ppos)
1647{
1648 char temp[80];
1649 ssize_t rc;
1650
1651 if (*ppos != 0)
1652 return 0;
1653
1654 sprintf(temp, "%d", smack_cipso_direct);
1655 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1656
1657 return rc;
1658}
1659
1660/**
1661 * smk_write_direct - write() for /smack/direct
1662 * @file: file pointer, not actually used
1663 * @buf: where to get the data from
1664 * @count: bytes sent
1665 * @ppos: where to start
1666 *
1667 * Returns number of bytes written or error code, as appropriate
1668 */
1669static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1670 size_t count, loff_t *ppos)
1671{
1672 struct smack_known *skp;
1673 char temp[80];
1674 int i;
1675
1676 if (!smack_privileged(CAP_MAC_ADMIN))
1677 return -EPERM;
1678
1679 if (count >= sizeof(temp) || count == 0)
1680 return -EINVAL;
1681
1682 if (copy_from_user(temp, buf, count) != 0)
1683 return -EFAULT;
1684
1685 temp[count] = '\0';
1686
1687 if (sscanf(temp, "%d", &i) != 1)
1688 return -EINVAL;
1689
1690 /*
1691 * Don't do anything if the value hasn't actually changed.
1692 * If it is changing reset the level on entries that were
1693 * set up to be direct when they were created.
1694 */
1695 if (smack_cipso_direct != i) {
1696 mutex_lock(&smack_known_lock);
1697 list_for_each_entry_rcu(skp, &smack_known_list, list)
1698 if (skp->smk_netlabel.attr.mls.lvl ==
1699 smack_cipso_direct)
1700 skp->smk_netlabel.attr.mls.lvl = i;
1701 smack_cipso_direct = i;
1702 mutex_unlock(&smack_known_lock);
1703 }
1704
1705 return count;
1706}
1707
1708static const struct file_operations smk_direct_ops = {
1709 .read = smk_read_direct,
1710 .write = smk_write_direct,
1711 .llseek = default_llseek,
1712};
1713
1714/**
1715 * smk_read_mapped - read() for /smack/mapped
1716 * @filp: file pointer, not actually used
1717 * @buf: where to put the result
1718 * @count: maximum to send along
1719 * @ppos: where to start
1720 *
1721 * Returns number of bytes read or error code, as appropriate
1722 */
1723static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1724 size_t count, loff_t *ppos)
1725{
1726 char temp[80];
1727 ssize_t rc;
1728
1729 if (*ppos != 0)
1730 return 0;
1731
1732 sprintf(temp, "%d", smack_cipso_mapped);
1733 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1734
1735 return rc;
1736}
1737
1738/**
1739 * smk_write_mapped - write() for /smack/mapped
1740 * @file: file pointer, not actually used
1741 * @buf: where to get the data from
1742 * @count: bytes sent
1743 * @ppos: where to start
1744 *
1745 * Returns number of bytes written or error code, as appropriate
1746 */
1747static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1748 size_t count, loff_t *ppos)
1749{
1750 struct smack_known *skp;
1751 char temp[80];
1752 int i;
1753
1754 if (!smack_privileged(CAP_MAC_ADMIN))
1755 return -EPERM;
1756
1757 if (count >= sizeof(temp) || count == 0)
1758 return -EINVAL;
1759
1760 if (copy_from_user(temp, buf, count) != 0)
1761 return -EFAULT;
1762
1763 temp[count] = '\0';
1764
1765 if (sscanf(temp, "%d", &i) != 1)
1766 return -EINVAL;
1767
1768 /*
1769 * Don't do anything if the value hasn't actually changed.
1770 * If it is changing reset the level on entries that were
1771 * set up to be mapped when they were created.
1772 */
1773 if (smack_cipso_mapped != i) {
1774 mutex_lock(&smack_known_lock);
1775 list_for_each_entry_rcu(skp, &smack_known_list, list)
1776 if (skp->smk_netlabel.attr.mls.lvl ==
1777 smack_cipso_mapped)
1778 skp->smk_netlabel.attr.mls.lvl = i;
1779 smack_cipso_mapped = i;
1780 mutex_unlock(&smack_known_lock);
1781 }
1782
1783 return count;
1784}
1785
1786static const struct file_operations smk_mapped_ops = {
1787 .read = smk_read_mapped,
1788 .write = smk_write_mapped,
1789 .llseek = default_llseek,
1790};
1791
1792/**
1793 * smk_read_ambient - read() for /smack/ambient
1794 * @filp: file pointer, not actually used
1795 * @buf: where to put the result
1796 * @cn: maximum to send along
1797 * @ppos: where to start
1798 *
1799 * Returns number of bytes read or error code, as appropriate
1800 */
1801static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1802 size_t cn, loff_t *ppos)
1803{
1804 ssize_t rc;
1805 int asize;
1806
1807 if (*ppos != 0)
1808 return 0;
1809 /*
1810 * Being careful to avoid a problem in the case where
1811 * smack_net_ambient gets changed in midstream.
1812 */
1813 mutex_lock(&smack_ambient_lock);
1814
1815 asize = strlen(smack_net_ambient->smk_known) + 1;
1816
1817 if (cn >= asize)
1818 rc = simple_read_from_buffer(buf, cn, ppos,
1819 smack_net_ambient->smk_known,
1820 asize);
1821 else
1822 rc = -EINVAL;
1823
1824 mutex_unlock(&smack_ambient_lock);
1825
1826 return rc;
1827}
1828
1829/**
1830 * smk_write_ambient - write() for /smack/ambient
1831 * @file: file pointer, not actually used
1832 * @buf: where to get the data from
1833 * @count: bytes sent
1834 * @ppos: where to start
1835 *
1836 * Returns number of bytes written or error code, as appropriate
1837 */
1838static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1839 size_t count, loff_t *ppos)
1840{
1841 struct smack_known *skp;
1842 char *oldambient;
1843 char *data;
1844 int rc = count;
1845
1846 if (!smack_privileged(CAP_MAC_ADMIN))
1847 return -EPERM;
1848
1849 /* Enough data must be present */
1850 if (count == 0 || count > PAGE_SIZE)
1851 return -EINVAL;
1852
1853 data = memdup_user_nul(buf, count);
1854 if (IS_ERR(data))
1855 return PTR_ERR(data);
1856
1857 skp = smk_import_entry(data, count);
1858 if (IS_ERR(skp)) {
1859 rc = PTR_ERR(skp);
1860 goto out;
1861 }
1862
1863 mutex_lock(&smack_ambient_lock);
1864
1865 oldambient = smack_net_ambient->smk_known;
1866 smack_net_ambient = skp;
1867 smk_unlbl_ambient(oldambient);
1868
1869 mutex_unlock(&smack_ambient_lock);
1870
1871out:
1872 kfree(data);
1873 return rc;
1874}
1875
1876static const struct file_operations smk_ambient_ops = {
1877 .read = smk_read_ambient,
1878 .write = smk_write_ambient,
1879 .llseek = default_llseek,
1880};
1881
1882/*
1883 * Seq_file operations for /smack/onlycap
1884 */
1885static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1886{
1887 return smk_seq_start(s, pos, &smack_onlycap_list);
1888}
1889
1890static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1891{
1892 return smk_seq_next(s, v, pos, &smack_onlycap_list);
1893}
1894
1895static int onlycap_seq_show(struct seq_file *s, void *v)
1896{
1897 struct list_head *list = v;
1898 struct smack_known_list_elem *sklep =
1899 list_entry_rcu(list, struct smack_known_list_elem, list);
1900
1901 seq_puts(s, sklep->smk_label->smk_known);
1902 seq_putc(s, ' ');
1903
1904 return 0;
1905}
1906
1907static const struct seq_operations onlycap_seq_ops = {
1908 .start = onlycap_seq_start,
1909 .next = onlycap_seq_next,
1910 .show = onlycap_seq_show,
1911 .stop = smk_seq_stop,
1912};
1913
1914static int smk_open_onlycap(struct inode *inode, struct file *file)
1915{
1916 return seq_open(file, &onlycap_seq_ops);
1917}
1918
1919/**
1920 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1921 * The caller must hold appropriate mutex to prevent concurrent modifications
1922 * to the public list.
1923 * Private list is assumed to be not accessible to other threads yet.
1924 *
1925 * @public: public list
1926 * @private: private list
1927 */
1928static void smk_list_swap_rcu(struct list_head *public,
1929 struct list_head *private)
1930{
1931 struct list_head *first, *last;
1932
1933 if (list_empty(public)) {
1934 list_splice_init_rcu(private, public, synchronize_rcu);
1935 } else {
1936 /* Remember public list before replacing it */
1937 first = public->next;
1938 last = public->prev;
1939
1940 /* Publish private list in place of public in RCU-safe way */
1941 private->prev->next = public;
1942 private->next->prev = public;
1943 rcu_assign_pointer(public->next, private->next);
1944 public->prev = private->prev;
1945
1946 synchronize_rcu();
1947
1948 /* When all readers are done with the old public list,
1949 * attach it in place of private */
1950 private->next = first;
1951 private->prev = last;
1952 first->prev = private;
1953 last->next = private;
1954 }
1955}
1956
1957/**
1958 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1959 *
1960 * @data: the string to parse
1961 * @list: destination list
1962 *
1963 * Returns zero on success or error code, as appropriate
1964 */
1965static int smk_parse_label_list(char *data, struct list_head *list)
1966{
1967 char *tok;
1968 struct smack_known *skp;
1969 struct smack_known_list_elem *sklep;
1970
1971 while ((tok = strsep(&data, " ")) != NULL) {
1972 if (!*tok)
1973 continue;
1974
1975 skp = smk_import_entry(tok, 0);
1976 if (IS_ERR(skp))
1977 return PTR_ERR(skp);
1978
1979 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1980 if (sklep == NULL)
1981 return -ENOMEM;
1982
1983 sklep->smk_label = skp;
1984 list_add(&sklep->list, list);
1985 }
1986
1987 return 0;
1988}
1989
1990/**
1991 * smk_destroy_label_list - destroy a list of smack_known_list_elem
1992 * @list: header pointer of the list to destroy
1993 */
1994void smk_destroy_label_list(struct list_head *list)
1995{
1996 struct smack_known_list_elem *sklep;
1997 struct smack_known_list_elem *sklep2;
1998
1999 list_for_each_entry_safe(sklep, sklep2, list, list)
2000 kfree(sklep);
2001
2002 INIT_LIST_HEAD(list);
2003}
2004
2005/**
2006 * smk_write_onlycap - write() for smackfs/onlycap
2007 * @file: file pointer, not actually used
2008 * @buf: where to get the data from
2009 * @count: bytes sent
2010 * @ppos: where to start
2011 *
2012 * Returns number of bytes written or error code, as appropriate
2013 */
2014static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
2015 size_t count, loff_t *ppos)
2016{
2017 char *data;
2018 LIST_HEAD(list_tmp);
2019 int rc;
2020
2021 if (!smack_privileged(CAP_MAC_ADMIN))
2022 return -EPERM;
2023
2024 if (count > PAGE_SIZE)
2025 return -EINVAL;
2026
2027 data = memdup_user_nul(buf, count);
2028 if (IS_ERR(data))
2029 return PTR_ERR(data);
2030
2031 rc = smk_parse_label_list(data, &list_tmp);
2032 kfree(data);
2033
2034 /*
2035 * Clear the smack_onlycap on invalid label errors. This means
2036 * that we can pass a null string to unset the onlycap value.
2037 *
2038 * Importing will also reject a label beginning with '-',
2039 * so "-usecapabilities" will also work.
2040 *
2041 * But do so only on invalid label, not on system errors.
2042 * The invalid label must be first to count as clearing attempt.
2043 */
2044 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2045 mutex_lock(&smack_onlycap_lock);
2046 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2047 mutex_unlock(&smack_onlycap_lock);
2048 rc = count;
2049 }
2050
2051 smk_destroy_label_list(&list_tmp);
2052
2053 return rc;
2054}
2055
2056static const struct file_operations smk_onlycap_ops = {
2057 .open = smk_open_onlycap,
2058 .read = seq_read,
2059 .write = smk_write_onlycap,
2060 .llseek = seq_lseek,
2061 .release = seq_release,
2062};
2063
2064#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2065/**
2066 * smk_read_unconfined - read() for smackfs/unconfined
2067 * @filp: file pointer, not actually used
2068 * @buf: where to put the result
2069 * @cn: maximum to send along
2070 * @ppos: where to start
2071 *
2072 * Returns number of bytes read or error code, as appropriate
2073 */
2074static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2075 size_t cn, loff_t *ppos)
2076{
2077 char *smack = "";
2078 ssize_t rc = -EINVAL;
2079 int asize;
2080
2081 if (*ppos != 0)
2082 return 0;
2083
2084 if (smack_unconfined != NULL)
2085 smack = smack_unconfined->smk_known;
2086
2087 asize = strlen(smack) + 1;
2088
2089 if (cn >= asize)
2090 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2091
2092 return rc;
2093}
2094
2095/**
2096 * smk_write_unconfined - write() for smackfs/unconfined
2097 * @file: file pointer, not actually used
2098 * @buf: where to get the data from
2099 * @count: bytes sent
2100 * @ppos: where to start
2101 *
2102 * Returns number of bytes written or error code, as appropriate
2103 */
2104static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2105 size_t count, loff_t *ppos)
2106{
2107 char *data;
2108 struct smack_known *skp;
2109 int rc = count;
2110
2111 if (!smack_privileged(CAP_MAC_ADMIN))
2112 return -EPERM;
2113
2114 if (count > PAGE_SIZE)
2115 return -EINVAL;
2116
2117 data = memdup_user_nul(buf, count);
2118 if (IS_ERR(data))
2119 return PTR_ERR(data);
2120
2121 /*
2122 * Clear the smack_unconfined on invalid label errors. This means
2123 * that we can pass a null string to unset the unconfined value.
2124 *
2125 * Importing will also reject a label beginning with '-',
2126 * so "-confine" will also work.
2127 *
2128 * But do so only on invalid label, not on system errors.
2129 */
2130 skp = smk_import_entry(data, count);
2131 if (PTR_ERR(skp) == -EINVAL)
2132 skp = NULL;
2133 else if (IS_ERR(skp)) {
2134 rc = PTR_ERR(skp);
2135 goto freeout;
2136 }
2137
2138 smack_unconfined = skp;
2139
2140freeout:
2141 kfree(data);
2142 return rc;
2143}
2144
2145static const struct file_operations smk_unconfined_ops = {
2146 .read = smk_read_unconfined,
2147 .write = smk_write_unconfined,
2148 .llseek = default_llseek,
2149};
2150#endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2151
2152/**
2153 * smk_read_logging - read() for /smack/logging
2154 * @filp: file pointer, not actually used
2155 * @buf: where to put the result
2156 * @count: maximum to send along
2157 * @ppos: where to start
2158 *
2159 * Returns number of bytes read or error code, as appropriate
2160 */
2161static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2162 size_t count, loff_t *ppos)
2163{
2164 char temp[32];
2165 ssize_t rc;
2166
2167 if (*ppos != 0)
2168 return 0;
2169
2170 sprintf(temp, "%d\n", log_policy);
2171 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2172 return rc;
2173}
2174
2175/**
2176 * smk_write_logging - write() for /smack/logging
2177 * @file: file pointer, not actually used
2178 * @buf: where to get the data from
2179 * @count: bytes sent
2180 * @ppos: where to start
2181 *
2182 * Returns number of bytes written or error code, as appropriate
2183 */
2184static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2185 size_t count, loff_t *ppos)
2186{
2187 char temp[32];
2188 int i;
2189
2190 if (!smack_privileged(CAP_MAC_ADMIN))
2191 return -EPERM;
2192
2193 if (count >= sizeof(temp) || count == 0)
2194 return -EINVAL;
2195
2196 if (copy_from_user(temp, buf, count) != 0)
2197 return -EFAULT;
2198
2199 temp[count] = '\0';
2200
2201 if (sscanf(temp, "%d", &i) != 1)
2202 return -EINVAL;
2203 if (i < 0 || i > 3)
2204 return -EINVAL;
2205 log_policy = i;
2206 return count;
2207}
2208
2209
2210
2211static const struct file_operations smk_logging_ops = {
2212 .read = smk_read_logging,
2213 .write = smk_write_logging,
2214 .llseek = default_llseek,
2215};
2216
2217/*
2218 * Seq_file read operations for /smack/load-self
2219 */
2220
2221static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2222{
2223 struct task_smack *tsp = smack_cred(current_cred());
2224
2225 return smk_seq_start(s, pos, &tsp->smk_rules);
2226}
2227
2228static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2229{
2230 struct task_smack *tsp = smack_cred(current_cred());
2231
2232 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2233}
2234
2235static int load_self_seq_show(struct seq_file *s, void *v)
2236{
2237 struct list_head *list = v;
2238 struct smack_rule *srp =
2239 list_entry_rcu(list, struct smack_rule, list);
2240
2241 smk_rule_show(s, srp, SMK_LABELLEN);
2242
2243 return 0;
2244}
2245
2246static const struct seq_operations load_self_seq_ops = {
2247 .start = load_self_seq_start,
2248 .next = load_self_seq_next,
2249 .show = load_self_seq_show,
2250 .stop = smk_seq_stop,
2251};
2252
2253
2254/**
2255 * smk_open_load_self - open() for /smack/load-self2
2256 * @inode: inode structure representing file
2257 * @file: "load" file pointer
2258 *
2259 * For reading, use load_seq_* seq_file reading operations.
2260 */
2261static int smk_open_load_self(struct inode *inode, struct file *file)
2262{
2263 return seq_open(file, &load_self_seq_ops);
2264}
2265
2266/**
2267 * smk_write_load_self - write() for /smack/load-self
2268 * @file: file pointer, not actually used
2269 * @buf: where to get the data from
2270 * @count: bytes sent
2271 * @ppos: where to start - must be 0
2272 *
2273 */
2274static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2275 size_t count, loff_t *ppos)
2276{
2277 struct task_smack *tsp = smack_cred(current_cred());
2278
2279 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2280 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2281}
2282
2283static const struct file_operations smk_load_self_ops = {
2284 .open = smk_open_load_self,
2285 .read = seq_read,
2286 .llseek = seq_lseek,
2287 .write = smk_write_load_self,
2288 .release = seq_release,
2289};
2290
2291/**
2292 * smk_user_access - handle access check transaction
2293 * @file: file pointer
2294 * @buf: data from user space
2295 * @count: bytes sent
2296 * @ppos: where to start - must be 0
2297 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
2298 */
2299static ssize_t smk_user_access(struct file *file, const char __user *buf,
2300 size_t count, loff_t *ppos, int format)
2301{
2302 struct smack_parsed_rule rule;
2303 char *data;
2304 int res;
2305
2306 data = simple_transaction_get(file, buf, count);
2307 if (IS_ERR(data))
2308 return PTR_ERR(data);
2309
2310 if (format == SMK_FIXED24_FMT) {
2311 if (count < SMK_LOADLEN)
2312 return -EINVAL;
2313 res = smk_parse_rule(data, &rule, 0);
2314 } else {
2315 /*
2316 * simple_transaction_get() returns null-terminated data
2317 */
2318 res = smk_parse_long_rule(data, &rule, 0, 3);
2319 }
2320
2321 if (res >= 0)
2322 res = smk_access(rule.smk_subject, rule.smk_object,
2323 rule.smk_access1, NULL);
2324 else if (res != -ENOENT)
2325 return res;
2326
2327 /*
2328 * smk_access() can return a value > 0 in the "bringup" case.
2329 */
2330 data[0] = res >= 0 ? '1' : '0';
2331 data[1] = '\0';
2332
2333 simple_transaction_set(file, 2);
2334
2335 if (format == SMK_FIXED24_FMT)
2336 return SMK_LOADLEN;
2337 return count;
2338}
2339
2340/**
2341 * smk_write_access - handle access check transaction
2342 * @file: file pointer
2343 * @buf: data from user space
2344 * @count: bytes sent
2345 * @ppos: where to start - must be 0
2346 */
2347static ssize_t smk_write_access(struct file *file, const char __user *buf,
2348 size_t count, loff_t *ppos)
2349{
2350 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2351}
2352
2353static const struct file_operations smk_access_ops = {
2354 .write = smk_write_access,
2355 .read = simple_transaction_read,
2356 .release = simple_transaction_release,
2357 .llseek = generic_file_llseek,
2358};
2359
2360
2361/*
2362 * Seq_file read operations for /smack/load2
2363 */
2364
2365static int load2_seq_show(struct seq_file *s, void *v)
2366{
2367 struct list_head *list = v;
2368 struct smack_rule *srp;
2369 struct smack_known *skp =
2370 list_entry_rcu(list, struct smack_known, list);
2371
2372 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
2373 smk_rule_show(s, srp, SMK_LONGLABEL);
2374
2375 return 0;
2376}
2377
2378static const struct seq_operations load2_seq_ops = {
2379 .start = load2_seq_start,
2380 .next = load2_seq_next,
2381 .show = load2_seq_show,
2382 .stop = smk_seq_stop,
2383};
2384
2385/**
2386 * smk_open_load2 - open() for /smack/load2
2387 * @inode: inode structure representing file
2388 * @file: "load2" file pointer
2389 *
2390 * For reading, use load2_seq_* seq_file reading operations.
2391 */
2392static int smk_open_load2(struct inode *inode, struct file *file)
2393{
2394 return seq_open(file, &load2_seq_ops);
2395}
2396
2397/**
2398 * smk_write_load2 - write() for /smack/load2
2399 * @file: file pointer, not actually used
2400 * @buf: where to get the data from
2401 * @count: bytes sent
2402 * @ppos: where to start - must be 0
2403 *
2404 */
2405static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2406 size_t count, loff_t *ppos)
2407{
2408 /*
2409 * Must have privilege.
2410 */
2411 if (!smack_privileged(CAP_MAC_ADMIN))
2412 return -EPERM;
2413
2414 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2415 SMK_LONG_FMT);
2416}
2417
2418static const struct file_operations smk_load2_ops = {
2419 .open = smk_open_load2,
2420 .read = seq_read,
2421 .llseek = seq_lseek,
2422 .write = smk_write_load2,
2423 .release = seq_release,
2424};
2425
2426/*
2427 * Seq_file read operations for /smack/load-self2
2428 */
2429
2430static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2431{
2432 struct task_smack *tsp = smack_cred(current_cred());
2433
2434 return smk_seq_start(s, pos, &tsp->smk_rules);
2435}
2436
2437static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2438{
2439 struct task_smack *tsp = smack_cred(current_cred());
2440
2441 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2442}
2443
2444static int load_self2_seq_show(struct seq_file *s, void *v)
2445{
2446 struct list_head *list = v;
2447 struct smack_rule *srp =
2448 list_entry_rcu(list, struct smack_rule, list);
2449
2450 smk_rule_show(s, srp, SMK_LONGLABEL);
2451
2452 return 0;
2453}
2454
2455static const struct seq_operations load_self2_seq_ops = {
2456 .start = load_self2_seq_start,
2457 .next = load_self2_seq_next,
2458 .show = load_self2_seq_show,
2459 .stop = smk_seq_stop,
2460};
2461
2462/**
2463 * smk_open_load_self2 - open() for /smack/load-self2
2464 * @inode: inode structure representing file
2465 * @file: "load" file pointer
2466 *
2467 * For reading, use load_seq_* seq_file reading operations.
2468 */
2469static int smk_open_load_self2(struct inode *inode, struct file *file)
2470{
2471 return seq_open(file, &load_self2_seq_ops);
2472}
2473
2474/**
2475 * smk_write_load_self2 - write() for /smack/load-self2
2476 * @file: file pointer, not actually used
2477 * @buf: where to get the data from
2478 * @count: bytes sent
2479 * @ppos: where to start - must be 0
2480 *
2481 */
2482static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2483 size_t count, loff_t *ppos)
2484{
2485 struct task_smack *tsp = smack_cred(current_cred());
2486
2487 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2488 &tsp->smk_rules_lock, SMK_LONG_FMT);
2489}
2490
2491static const struct file_operations smk_load_self2_ops = {
2492 .open = smk_open_load_self2,
2493 .read = seq_read,
2494 .llseek = seq_lseek,
2495 .write = smk_write_load_self2,
2496 .release = seq_release,
2497};
2498
2499/**
2500 * smk_write_access2 - handle access check transaction
2501 * @file: file pointer
2502 * @buf: data from user space
2503 * @count: bytes sent
2504 * @ppos: where to start - must be 0
2505 */
2506static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2507 size_t count, loff_t *ppos)
2508{
2509 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2510}
2511
2512static const struct file_operations smk_access2_ops = {
2513 .write = smk_write_access2,
2514 .read = simple_transaction_read,
2515 .release = simple_transaction_release,
2516 .llseek = generic_file_llseek,
2517};
2518
2519/**
2520 * smk_write_revoke_subj - write() for /smack/revoke-subject
2521 * @file: file pointer
2522 * @buf: data from user space
2523 * @count: bytes sent
2524 * @ppos: where to start - must be 0
2525 */
2526static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2527 size_t count, loff_t *ppos)
2528{
2529 char *data;
2530 const char *cp;
2531 struct smack_known *skp;
2532 struct smack_rule *sp;
2533 struct list_head *rule_list;
2534 struct mutex *rule_lock;
2535 int rc = count;
2536
2537 if (*ppos != 0)
2538 return -EINVAL;
2539
2540 if (!smack_privileged(CAP_MAC_ADMIN))
2541 return -EPERM;
2542
2543 if (count == 0 || count > SMK_LONGLABEL)
2544 return -EINVAL;
2545
2546 data = memdup_user(buf, count);
2547 if (IS_ERR(data))
2548 return PTR_ERR(data);
2549
2550 cp = smk_parse_smack(data, count);
2551 if (IS_ERR(cp)) {
2552 rc = PTR_ERR(cp);
2553 goto out_data;
2554 }
2555
2556 skp = smk_find_entry(cp);
2557 if (skp == NULL)
2558 goto out_cp;
2559
2560 rule_list = &skp->smk_rules;
2561 rule_lock = &skp->smk_rules_lock;
2562
2563 mutex_lock(rule_lock);
2564
2565 list_for_each_entry_rcu(sp, rule_list, list)
2566 sp->smk_access = 0;
2567
2568 mutex_unlock(rule_lock);
2569
2570out_cp:
2571 kfree(cp);
2572out_data:
2573 kfree(data);
2574
2575 return rc;
2576}
2577
2578static const struct file_operations smk_revoke_subj_ops = {
2579 .write = smk_write_revoke_subj,
2580 .read = simple_transaction_read,
2581 .release = simple_transaction_release,
2582 .llseek = generic_file_llseek,
2583};
2584
2585/**
2586 * smk_init_sysfs - initialize /sys/fs/smackfs
2587 *
2588 */
2589static int smk_init_sysfs(void)
2590{
2591 return sysfs_create_mount_point(fs_kobj, "smackfs");
2592}
2593
2594/**
2595 * smk_write_change_rule - write() for /smack/change-rule
2596 * @file: file pointer
2597 * @buf: data from user space
2598 * @count: bytes sent
2599 * @ppos: where to start - must be 0
2600 */
2601static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2602 size_t count, loff_t *ppos)
2603{
2604 /*
2605 * Must have privilege.
2606 */
2607 if (!smack_privileged(CAP_MAC_ADMIN))
2608 return -EPERM;
2609
2610 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2611 SMK_CHANGE_FMT);
2612}
2613
2614static const struct file_operations smk_change_rule_ops = {
2615 .write = smk_write_change_rule,
2616 .read = simple_transaction_read,
2617 .release = simple_transaction_release,
2618 .llseek = generic_file_llseek,
2619};
2620
2621/**
2622 * smk_read_syslog - read() for smackfs/syslog
2623 * @filp: file pointer, not actually used
2624 * @buf: where to put the result
2625 * @cn: maximum to send along
2626 * @ppos: where to start
2627 *
2628 * Returns number of bytes read or error code, as appropriate
2629 */
2630static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2631 size_t cn, loff_t *ppos)
2632{
2633 struct smack_known *skp;
2634 ssize_t rc = -EINVAL;
2635 int asize;
2636
2637 if (*ppos != 0)
2638 return 0;
2639
2640 if (smack_syslog_label == NULL)
2641 skp = &smack_known_star;
2642 else
2643 skp = smack_syslog_label;
2644
2645 asize = strlen(skp->smk_known) + 1;
2646
2647 if (cn >= asize)
2648 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2649 asize);
2650
2651 return rc;
2652}
2653
2654/**
2655 * smk_write_syslog - write() for smackfs/syslog
2656 * @file: file pointer, not actually used
2657 * @buf: where to get the data from
2658 * @count: bytes sent
2659 * @ppos: where to start
2660 *
2661 * Returns number of bytes written or error code, as appropriate
2662 */
2663static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2664 size_t count, loff_t *ppos)
2665{
2666 char *data;
2667 struct smack_known *skp;
2668 int rc = count;
2669
2670 if (!smack_privileged(CAP_MAC_ADMIN))
2671 return -EPERM;
2672
2673 /* Enough data must be present */
2674 if (count == 0 || count > PAGE_SIZE)
2675 return -EINVAL;
2676
2677 data = memdup_user_nul(buf, count);
2678 if (IS_ERR(data))
2679 return PTR_ERR(data);
2680
2681 skp = smk_import_entry(data, count);
2682 if (IS_ERR(skp))
2683 rc = PTR_ERR(skp);
2684 else
2685 smack_syslog_label = skp;
2686
2687 kfree(data);
2688 return rc;
2689}
2690
2691static const struct file_operations smk_syslog_ops = {
2692 .read = smk_read_syslog,
2693 .write = smk_write_syslog,
2694 .llseek = default_llseek,
2695};
2696
2697/*
2698 * Seq_file read operations for /smack/relabel-self
2699 */
2700
2701static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2702{
2703 struct task_smack *tsp = smack_cred(current_cred());
2704
2705 return smk_seq_start(s, pos, &tsp->smk_relabel);
2706}
2707
2708static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2709{
2710 struct task_smack *tsp = smack_cred(current_cred());
2711
2712 return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2713}
2714
2715static int relabel_self_seq_show(struct seq_file *s, void *v)
2716{
2717 struct list_head *list = v;
2718 struct smack_known_list_elem *sklep =
2719 list_entry(list, struct smack_known_list_elem, list);
2720
2721 seq_puts(s, sklep->smk_label->smk_known);
2722 seq_putc(s, ' ');
2723
2724 return 0;
2725}
2726
2727static const struct seq_operations relabel_self_seq_ops = {
2728 .start = relabel_self_seq_start,
2729 .next = relabel_self_seq_next,
2730 .show = relabel_self_seq_show,
2731 .stop = smk_seq_stop,
2732};
2733
2734/**
2735 * smk_open_relabel_self - open() for /smack/relabel-self
2736 * @inode: inode structure representing file
2737 * @file: "relabel-self" file pointer
2738 *
2739 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2740 * file_operations
2741 */
2742static int smk_open_relabel_self(struct inode *inode, struct file *file)
2743{
2744 return seq_open(file, &relabel_self_seq_ops);
2745}
2746
2747/**
2748 * smk_write_relabel_self - write() for /smack/relabel-self
2749 * @file: file pointer, not actually used
2750 * @buf: where to get the data from
2751 * @count: bytes sent
2752 * @ppos: where to start - must be 0
2753 *
2754 */
2755static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2756 size_t count, loff_t *ppos)
2757{
2758 char *data;
2759 int rc;
2760 LIST_HEAD(list_tmp);
2761
2762 /*
2763 * Must have privilege.
2764 */
2765 if (!smack_privileged(CAP_MAC_ADMIN))
2766 return -EPERM;
2767
2768 /*
2769 * No partial write.
2770 * Enough data must be present.
2771 */
2772 if (*ppos != 0)
2773 return -EINVAL;
2774 if (count == 0 || count > PAGE_SIZE)
2775 return -EINVAL;
2776
2777 data = memdup_user_nul(buf, count);
2778 if (IS_ERR(data))
2779 return PTR_ERR(data);
2780
2781 rc = smk_parse_label_list(data, &list_tmp);
2782 kfree(data);
2783
2784 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2785 struct cred *new;
2786 struct task_smack *tsp;
2787
2788 new = prepare_creds();
2789 if (!new) {
2790 rc = -ENOMEM;
2791 goto out;
2792 }
2793 tsp = smack_cred(new);
2794 smk_destroy_label_list(&tsp->smk_relabel);
2795 list_splice(&list_tmp, &tsp->smk_relabel);
2796 commit_creds(new);
2797 return count;
2798 }
2799out:
2800 smk_destroy_label_list(&list_tmp);
2801 return rc;
2802}
2803
2804static const struct file_operations smk_relabel_self_ops = {
2805 .open = smk_open_relabel_self,
2806 .read = seq_read,
2807 .llseek = seq_lseek,
2808 .write = smk_write_relabel_self,
2809 .release = seq_release,
2810};
2811
2812/**
2813 * smk_read_ptrace - read() for /smack/ptrace
2814 * @filp: file pointer, not actually used
2815 * @buf: where to put the result
2816 * @count: maximum to send along
2817 * @ppos: where to start
2818 *
2819 * Returns number of bytes read or error code, as appropriate
2820 */
2821static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2822 size_t count, loff_t *ppos)
2823{
2824 char temp[32];
2825 ssize_t rc;
2826
2827 if (*ppos != 0)
2828 return 0;
2829
2830 sprintf(temp, "%d\n", smack_ptrace_rule);
2831 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2832 return rc;
2833}
2834
2835/**
2836 * smk_write_ptrace - write() for /smack/ptrace
2837 * @file: file pointer
2838 * @buf: data from user space
2839 * @count: bytes sent
2840 * @ppos: where to start - must be 0
2841 */
2842static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2843 size_t count, loff_t *ppos)
2844{
2845 char temp[32];
2846 int i;
2847
2848 if (!smack_privileged(CAP_MAC_ADMIN))
2849 return -EPERM;
2850
2851 if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2852 return -EINVAL;
2853
2854 if (copy_from_user(temp, buf, count) != 0)
2855 return -EFAULT;
2856
2857 temp[count] = '\0';
2858
2859 if (sscanf(temp, "%d", &i) != 1)
2860 return -EINVAL;
2861 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2862 return -EINVAL;
2863 smack_ptrace_rule = i;
2864
2865 return count;
2866}
2867
2868static const struct file_operations smk_ptrace_ops = {
2869 .write = smk_write_ptrace,
2870 .read = smk_read_ptrace,
2871 .llseek = default_llseek,
2872};
2873
2874/**
2875 * smk_fill_super - fill the smackfs superblock
2876 * @sb: the empty superblock
2877 * @fc: unused
2878 *
2879 * Fill in the well known entries for the smack filesystem
2880 *
2881 * Returns 0 on success, an error code on failure
2882 */
2883static int smk_fill_super(struct super_block *sb, struct fs_context *fc)
2884{
2885 int rc;
2886
2887 static const struct tree_descr smack_files[] = {
2888 [SMK_LOAD] = {
2889 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2890 [SMK_CIPSO] = {
2891 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2892 [SMK_DOI] = {
2893 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2894 [SMK_DIRECT] = {
2895 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2896 [SMK_AMBIENT] = {
2897 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2898 [SMK_NET4ADDR] = {
2899 "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2900 [SMK_ONLYCAP] = {
2901 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2902 [SMK_LOGGING] = {
2903 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2904 [SMK_LOAD_SELF] = {
2905 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2906 [SMK_ACCESSES] = {
2907 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2908 [SMK_MAPPED] = {
2909 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2910 [SMK_LOAD2] = {
2911 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2912 [SMK_LOAD_SELF2] = {
2913 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2914 [SMK_ACCESS2] = {
2915 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2916 [SMK_CIPSO2] = {
2917 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2918 [SMK_REVOKE_SUBJ] = {
2919 "revoke-subject", &smk_revoke_subj_ops,
2920 S_IRUGO|S_IWUSR},
2921 [SMK_CHANGE_RULE] = {
2922 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2923 [SMK_SYSLOG] = {
2924 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2925 [SMK_PTRACE] = {
2926 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2927#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2928 [SMK_UNCONFINED] = {
2929 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2930#endif
2931#if IS_ENABLED(CONFIG_IPV6)
2932 [SMK_NET6ADDR] = {
2933 "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2934#endif /* CONFIG_IPV6 */
2935 [SMK_RELABEL_SELF] = {
2936 "relabel-self", &smk_relabel_self_ops,
2937 S_IRUGO|S_IWUGO},
2938 /* last one */
2939 {""}
2940 };
2941
2942 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2943 if (rc != 0) {
2944 printk(KERN_ERR "%s failed %d while creating inodes\n",
2945 __func__, rc);
2946 return rc;
2947 }
2948
2949 return 0;
2950}
2951
2952/**
2953 * smk_get_tree - get the smackfs superblock
2954 * @fc: The mount context, including any options
2955 *
2956 * Just passes everything along.
2957 *
2958 * Returns what the lower level code does.
2959 */
2960static int smk_get_tree(struct fs_context *fc)
2961{
2962 return get_tree_single(fc, smk_fill_super);
2963}
2964
2965static const struct fs_context_operations smk_context_ops = {
2966 .get_tree = smk_get_tree,
2967};
2968
2969/**
2970 * smk_init_fs_context - Initialise a filesystem context for smackfs
2971 * @fc: The blank mount context
2972 */
2973static int smk_init_fs_context(struct fs_context *fc)
2974{
2975 fc->ops = &smk_context_ops;
2976 return 0;
2977}
2978
2979static struct file_system_type smk_fs_type = {
2980 .name = "smackfs",
2981 .init_fs_context = smk_init_fs_context,
2982 .kill_sb = kill_litter_super,
2983};
2984
2985static struct vfsmount *smackfs_mount;
2986
2987/**
2988 * init_smk_fs - get the smackfs superblock
2989 *
2990 * register the smackfs
2991 *
2992 * Do not register smackfs if Smack wasn't enabled
2993 * on boot. We can not put this method normally under the
2994 * smack_init() code path since the security subsystem get
2995 * initialized before the vfs caches.
2996 *
2997 * Returns true if we were not chosen on boot or if
2998 * we were chosen and filesystem registration succeeded.
2999 */
3000static int __init init_smk_fs(void)
3001{
3002 int err;
3003 int rc;
3004
3005 if (smack_enabled == 0)
3006 return 0;
3007
3008 err = smk_init_sysfs();
3009 if (err)
3010 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
3011
3012 err = register_filesystem(&smk_fs_type);
3013 if (!err) {
3014 smackfs_mount = kern_mount(&smk_fs_type);
3015 if (IS_ERR(smackfs_mount)) {
3016 printk(KERN_ERR "smackfs: could not mount!\n");
3017 err = PTR_ERR(smackfs_mount);
3018 smackfs_mount = NULL;
3019 }
3020 }
3021
3022 smk_cipso_doi();
3023 smk_unlbl_ambient(NULL);
3024
3025 rc = smack_populate_secattr(&smack_known_floor);
3026 if (err == 0 && rc < 0)
3027 err = rc;
3028 rc = smack_populate_secattr(&smack_known_hat);
3029 if (err == 0 && rc < 0)
3030 err = rc;
3031 rc = smack_populate_secattr(&smack_known_huh);
3032 if (err == 0 && rc < 0)
3033 err = rc;
3034 rc = smack_populate_secattr(&smack_known_star);
3035 if (err == 0 && rc < 0)
3036 err = rc;
3037 rc = smack_populate_secattr(&smack_known_web);
3038 if (err == 0 && rc < 0)
3039 err = rc;
3040
3041 return err;
3042}
3043
3044__initcall(init_smk_fs);
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/cipso_ipv4.h>
26#include <linux/seq_file.h>
27#include <linux/ctype.h>
28#include <linux/audit.h>
29#include <linux/magic.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 SMK_ACCESSES = 12, /* access policy */
48 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
49 SMK_LOAD2 = 14, /* load policy with long labels */
50 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
51 SMK_ACCESS2 = 16, /* make an access check with long labels */
52 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
53 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
54 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
55 SMK_SYSLOG = 20, /* change syslog label) */
56};
57
58/*
59 * List locks
60 */
61static DEFINE_MUTEX(smack_cipso_lock);
62static DEFINE_MUTEX(smack_ambient_lock);
63static DEFINE_MUTEX(smack_syslog_lock);
64static DEFINE_MUTEX(smk_netlbladdr_lock);
65
66/*
67 * This is the "ambient" label for network traffic.
68 * If it isn't somehow marked, use this.
69 * It can be reset via smackfs/ambient
70 */
71struct smack_known *smack_net_ambient;
72
73/*
74 * This is the level in a CIPSO header that indicates a
75 * smack label is contained directly in the category set.
76 * It can be reset via smackfs/direct
77 */
78int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
79
80/*
81 * This is the level in a CIPSO header that indicates a
82 * secid is contained directly in the category set.
83 * It can be reset via smackfs/mapped
84 */
85int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
86
87/*
88 * Unless a process is running with this label even
89 * having CAP_MAC_OVERRIDE isn't enough to grant
90 * privilege to violate MAC policy. If no label is
91 * designated (the NULL case) capabilities apply to
92 * everyone. It is expected that the hat (^) label
93 * will be used if any label is used.
94 */
95struct smack_known *smack_onlycap;
96
97/*
98 * If this value is set restrict syslog use to the label specified.
99 * It can be reset via smackfs/syslog
100 */
101struct smack_known *smack_syslog_label;
102
103/*
104 * Certain IP addresses may be designated as single label hosts.
105 * Packets are sent there unlabeled, but only from tasks that
106 * can write to the specified label.
107 */
108
109LIST_HEAD(smk_netlbladdr_list);
110
111/*
112 * Rule lists are maintained for each label.
113 * This master list is just for reading /smack/load and /smack/load2.
114 */
115struct smack_master_list {
116 struct list_head list;
117 struct smack_rule *smk_rule;
118};
119
120LIST_HEAD(smack_rule_list);
121
122struct smack_parsed_rule {
123 struct smack_known *smk_subject;
124 char *smk_object;
125 int smk_access1;
126 int smk_access2;
127};
128
129static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
130
131const char *smack_cipso_option = SMACK_CIPSO_OPTION;
132
133/*
134 * Values for parsing cipso rules
135 * SMK_DIGITLEN: Length of a digit field in a rule.
136 * SMK_CIPSOMIN: Minimum possible cipso rule length.
137 * SMK_CIPSOMAX: Maximum possible cipso rule length.
138 */
139#define SMK_DIGITLEN 4
140#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
141#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
142
143/*
144 * Values for parsing MAC rules
145 * SMK_ACCESS: Maximum possible combination of access permissions
146 * SMK_ACCESSLEN: Maximum length for a rule access field
147 * SMK_LOADLEN: Smack rule length
148 */
149#define SMK_OACCESS "rwxa"
150#define SMK_ACCESS "rwxatl"
151#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
152#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
153#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
154#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
155
156/*
157 * Stricly for CIPSO level manipulation.
158 * Set the category bit number in a smack label sized buffer.
159 */
160static inline void smack_catset_bit(unsigned int cat, char *catsetp)
161{
162 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
163 return;
164
165 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
166}
167
168/**
169 * smk_netlabel_audit_set - fill a netlbl_audit struct
170 * @nap: structure to fill
171 */
172static void smk_netlabel_audit_set(struct netlbl_audit *nap)
173{
174 struct smack_known *skp = smk_of_current();
175
176 nap->loginuid = audit_get_loginuid(current);
177 nap->sessionid = audit_get_sessionid(current);
178 nap->secid = skp->smk_secid;
179}
180
181/*
182 * Value for parsing single label host rules
183 * "1.2.3.4 X"
184 */
185#define SMK_NETLBLADDRMIN 9
186
187/**
188 * smk_set_access - add a rule to the rule list or replace an old rule
189 * @srp: the rule to add or replace
190 * @rule_list: the list of rules
191 * @rule_lock: the rule list lock
192 * @global: if non-zero, indicates a global rule
193 *
194 * Looks through the current subject/object/access list for
195 * the subject/object pair and replaces the access that was
196 * there. If the pair isn't found add it with the specified
197 * access.
198 *
199 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
200 * during the allocation of the new pair to add.
201 */
202static int smk_set_access(struct smack_parsed_rule *srp,
203 struct list_head *rule_list,
204 struct mutex *rule_lock, int global)
205{
206 struct smack_rule *sp;
207 struct smack_master_list *smlp;
208 int found = 0;
209 int rc = 0;
210
211 mutex_lock(rule_lock);
212
213 /*
214 * Because the object label is less likely to match
215 * than the subject label check it first
216 */
217 list_for_each_entry_rcu(sp, rule_list, list) {
218 if (sp->smk_object == srp->smk_object &&
219 sp->smk_subject == srp->smk_subject) {
220 found = 1;
221 sp->smk_access |= srp->smk_access1;
222 sp->smk_access &= ~srp->smk_access2;
223 break;
224 }
225 }
226
227 if (found == 0) {
228 sp = kzalloc(sizeof(*sp), GFP_KERNEL);
229 if (sp == NULL) {
230 rc = -ENOMEM;
231 goto out;
232 }
233
234 sp->smk_subject = srp->smk_subject;
235 sp->smk_object = srp->smk_object;
236 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
237
238 list_add_rcu(&sp->list, rule_list);
239 /*
240 * If this is a global as opposed to self and a new rule
241 * it needs to get added for reporting.
242 */
243 if (global) {
244 smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
245 if (smlp != NULL) {
246 smlp->smk_rule = sp;
247 list_add_rcu(&smlp->list, &smack_rule_list);
248 } else
249 rc = -ENOMEM;
250 }
251 }
252
253out:
254 mutex_unlock(rule_lock);
255 return rc;
256}
257
258/**
259 * smk_perm_from_str - parse smack accesses from a text string
260 * @string: a text string that contains a Smack accesses code
261 *
262 * Returns an integer with respective bits set for specified accesses.
263 */
264static int smk_perm_from_str(const char *string)
265{
266 int perm = 0;
267 const char *cp;
268
269 for (cp = string; ; cp++)
270 switch (*cp) {
271 case '-':
272 break;
273 case 'r':
274 case 'R':
275 perm |= MAY_READ;
276 break;
277 case 'w':
278 case 'W':
279 perm |= MAY_WRITE;
280 break;
281 case 'x':
282 case 'X':
283 perm |= MAY_EXEC;
284 break;
285 case 'a':
286 case 'A':
287 perm |= MAY_APPEND;
288 break;
289 case 't':
290 case 'T':
291 perm |= MAY_TRANSMUTE;
292 break;
293 case 'l':
294 case 'L':
295 perm |= MAY_LOCK;
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, -EINVAL on failure and -ENOENT when either subject
313 * or object is missing.
314 */
315static int smk_fill_rule(const char *subject, const char *object,
316 const char *access1, const char *access2,
317 struct smack_parsed_rule *rule, int import,
318 int len)
319{
320 const char *cp;
321 struct smack_known *skp;
322
323 if (import) {
324 rule->smk_subject = smk_import_entry(subject, len);
325 if (rule->smk_subject == NULL)
326 return -EINVAL;
327
328 rule->smk_object = smk_import(object, len);
329 if (rule->smk_object == NULL)
330 return -EINVAL;
331 } else {
332 cp = smk_parse_smack(subject, len);
333 if (cp == NULL)
334 return -EINVAL;
335 skp = smk_find_entry(cp);
336 kfree(cp);
337 if (skp == NULL)
338 return -ENOENT;
339 rule->smk_subject = skp;
340
341 cp = smk_parse_smack(object, len);
342 if (cp == NULL)
343 return -EINVAL;
344 skp = smk_find_entry(cp);
345 kfree(cp);
346 if (skp == NULL)
347 return -ENOENT;
348 rule->smk_object = skp->smk_known;
349 }
350
351 rule->smk_access1 = smk_perm_from_str(access1);
352 if (access2)
353 rule->smk_access2 = smk_perm_from_str(access2);
354 else
355 rule->smk_access2 = ~rule->smk_access1;
356
357 return 0;
358}
359
360/**
361 * smk_parse_rule - parse Smack rule from load string
362 * @data: string to be parsed whose size is SMK_LOADLEN
363 * @rule: Smack rule
364 * @import: if non-zero, import labels
365 *
366 * Returns 0 on success, -1 on errors.
367 */
368static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
369 int import)
370{
371 int rc;
372
373 rc = smk_fill_rule(data, data + SMK_LABELLEN,
374 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
375 import, SMK_LABELLEN);
376 return rc;
377}
378
379/**
380 * smk_parse_long_rule - parse Smack rule from rule string
381 * @data: string to be parsed, null terminated
382 * @rule: Will be filled with Smack parsed rule
383 * @import: if non-zero, import labels
384 * @tokens: numer of substrings expected in data
385 *
386 * Returns number of processed bytes on success, -1 on failure.
387 */
388static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
389 int import, int tokens)
390{
391 ssize_t cnt = 0;
392 char *tok[4];
393 int rc;
394 int i;
395
396 /*
397 * Parsing the rule in-place, filling all white-spaces with '\0'
398 */
399 for (i = 0; i < tokens; ++i) {
400 while (isspace(data[cnt]))
401 data[cnt++] = '\0';
402
403 if (data[cnt] == '\0')
404 /* Unexpected end of data */
405 return -1;
406
407 tok[i] = data + cnt;
408
409 while (data[cnt] && !isspace(data[cnt]))
410 ++cnt;
411 }
412 while (isspace(data[cnt]))
413 data[cnt++] = '\0';
414
415 while (i < 4)
416 tok[i++] = NULL;
417
418 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
419 return rc == 0 ? cnt : rc;
420}
421
422#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
423#define SMK_LONG_FMT 1 /* Variable long label format */
424#define SMK_CHANGE_FMT 2 /* Rule modification format */
425/**
426 * smk_write_rules_list - write() for any /smack rule file
427 * @file: file pointer, not actually used
428 * @buf: where to get the data from
429 * @count: bytes sent
430 * @ppos: where to start - must be 0
431 * @rule_list: the list of rules to write to
432 * @rule_lock: lock for the rule list
433 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
434 *
435 * Get one smack access rule from above.
436 * The format for SMK_LONG_FMT is:
437 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
438 * The format for SMK_FIXED24_FMT is exactly:
439 * "subject object rwxat"
440 * The format for SMK_CHANGE_FMT is:
441 * "subject<whitespace>object<whitespace>
442 * acc_enable<whitespace>acc_disable[<whitespace>...]"
443 */
444static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
445 size_t count, loff_t *ppos,
446 struct list_head *rule_list,
447 struct mutex *rule_lock, int format)
448{
449 struct smack_parsed_rule rule;
450 char *data;
451 int rc;
452 int trunc = 0;
453 int tokens;
454 ssize_t cnt = 0;
455
456 /*
457 * No partial writes.
458 * Enough data must be present.
459 */
460 if (*ppos != 0)
461 return -EINVAL;
462
463 if (format == SMK_FIXED24_FMT) {
464 /*
465 * Minor hack for backward compatibility
466 */
467 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
468 return -EINVAL;
469 } else {
470 if (count >= PAGE_SIZE) {
471 count = PAGE_SIZE - 1;
472 trunc = 1;
473 }
474 }
475
476 data = kmalloc(count + 1, GFP_KERNEL);
477 if (data == NULL)
478 return -ENOMEM;
479
480 if (copy_from_user(data, buf, count) != 0) {
481 rc = -EFAULT;
482 goto out;
483 }
484
485 /*
486 * In case of parsing only part of user buf,
487 * avoid having partial rule at the data buffer
488 */
489 if (trunc) {
490 while (count > 0 && (data[count - 1] != '\n'))
491 --count;
492 if (count == 0) {
493 rc = -EINVAL;
494 goto out;
495 }
496 }
497
498 data[count] = '\0';
499 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
500 while (cnt < count) {
501 if (format == SMK_FIXED24_FMT) {
502 rc = smk_parse_rule(data, &rule, 1);
503 if (rc != 0) {
504 rc = -EINVAL;
505 goto out;
506 }
507 cnt = count;
508 } else {
509 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
510 if (rc <= 0) {
511 rc = -EINVAL;
512 goto out;
513 }
514 cnt += rc;
515 }
516
517 if (rule_list == NULL)
518 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
519 &rule.smk_subject->smk_rules_lock, 1);
520 else
521 rc = smk_set_access(&rule, rule_list, rule_lock, 0);
522
523 if (rc)
524 goto out;
525 }
526
527 rc = cnt;
528out:
529 kfree(data);
530 return rc;
531}
532
533/*
534 * Core logic for smackfs seq list operations.
535 */
536
537static void *smk_seq_start(struct seq_file *s, loff_t *pos,
538 struct list_head *head)
539{
540 struct list_head *list;
541
542 /*
543 * This is 0 the first time through.
544 */
545 if (s->index == 0)
546 s->private = head;
547
548 if (s->private == NULL)
549 return NULL;
550
551 list = s->private;
552 if (list_empty(list))
553 return NULL;
554
555 if (s->index == 0)
556 return list->next;
557 return list;
558}
559
560static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
561 struct list_head *head)
562{
563 struct list_head *list = v;
564
565 if (list_is_last(list, head)) {
566 s->private = NULL;
567 return NULL;
568 }
569 s->private = list->next;
570 return list->next;
571}
572
573static void smk_seq_stop(struct seq_file *s, void *v)
574{
575 /* No-op */
576}
577
578static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
579{
580 /*
581 * Don't show any rules with label names too long for
582 * interface file (/smack/load or /smack/load2)
583 * because you should expect to be able to write
584 * anything you read back.
585 */
586 if (strlen(srp->smk_subject->smk_known) >= max ||
587 strlen(srp->smk_object) >= max)
588 return;
589
590 if (srp->smk_access == 0)
591 return;
592
593 seq_printf(s, "%s %s", srp->smk_subject->smk_known, srp->smk_object);
594
595 seq_putc(s, ' ');
596
597 if (srp->smk_access & MAY_READ)
598 seq_putc(s, 'r');
599 if (srp->smk_access & MAY_WRITE)
600 seq_putc(s, 'w');
601 if (srp->smk_access & MAY_EXEC)
602 seq_putc(s, 'x');
603 if (srp->smk_access & MAY_APPEND)
604 seq_putc(s, 'a');
605 if (srp->smk_access & MAY_TRANSMUTE)
606 seq_putc(s, 't');
607 if (srp->smk_access & MAY_LOCK)
608 seq_putc(s, 'l');
609
610 seq_putc(s, '\n');
611}
612
613/*
614 * Seq_file read operations for /smack/load
615 */
616
617static void *load2_seq_start(struct seq_file *s, loff_t *pos)
618{
619 return smk_seq_start(s, pos, &smack_rule_list);
620}
621
622static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
623{
624 return smk_seq_next(s, v, pos, &smack_rule_list);
625}
626
627static int load_seq_show(struct seq_file *s, void *v)
628{
629 struct list_head *list = v;
630 struct smack_master_list *smlp =
631 list_entry(list, struct smack_master_list, list);
632
633 smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);
634
635 return 0;
636}
637
638static const struct seq_operations load_seq_ops = {
639 .start = load2_seq_start,
640 .next = load2_seq_next,
641 .show = load_seq_show,
642 .stop = smk_seq_stop,
643};
644
645/**
646 * smk_open_load - open() for /smack/load
647 * @inode: inode structure representing file
648 * @file: "load" file pointer
649 *
650 * For reading, use load_seq_* seq_file reading operations.
651 */
652static int smk_open_load(struct inode *inode, struct file *file)
653{
654 return seq_open(file, &load_seq_ops);
655}
656
657/**
658 * smk_write_load - write() for /smack/load
659 * @file: file pointer, not actually used
660 * @buf: where to get the data from
661 * @count: bytes sent
662 * @ppos: where to start - must be 0
663 *
664 */
665static ssize_t smk_write_load(struct file *file, const char __user *buf,
666 size_t count, loff_t *ppos)
667{
668 /*
669 * Must have privilege.
670 * No partial writes.
671 * Enough data must be present.
672 */
673 if (!smack_privileged(CAP_MAC_ADMIN))
674 return -EPERM;
675
676 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
677 SMK_FIXED24_FMT);
678}
679
680static const struct file_operations smk_load_ops = {
681 .open = smk_open_load,
682 .read = seq_read,
683 .llseek = seq_lseek,
684 .write = smk_write_load,
685 .release = seq_release,
686};
687
688/**
689 * smk_cipso_doi - initialize the CIPSO domain
690 */
691static void smk_cipso_doi(void)
692{
693 int rc;
694 struct cipso_v4_doi *doip;
695 struct netlbl_audit nai;
696
697 smk_netlabel_audit_set(&nai);
698
699 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
700 if (rc != 0)
701 printk(KERN_WARNING "%s:%d remove rc = %d\n",
702 __func__, __LINE__, rc);
703
704 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
705 if (doip == NULL)
706 panic("smack: Failed to initialize cipso DOI.\n");
707 doip->map.std = NULL;
708 doip->doi = smk_cipso_doi_value;
709 doip->type = CIPSO_V4_MAP_PASS;
710 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
711 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
712 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
713
714 rc = netlbl_cfg_cipsov4_add(doip, &nai);
715 if (rc != 0) {
716 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
717 __func__, __LINE__, rc);
718 kfree(doip);
719 return;
720 }
721 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
722 if (rc != 0) {
723 printk(KERN_WARNING "%s:%d map add rc = %d\n",
724 __func__, __LINE__, rc);
725 kfree(doip);
726 return;
727 }
728}
729
730/**
731 * smk_unlbl_ambient - initialize the unlabeled domain
732 * @oldambient: previous domain string
733 */
734static void smk_unlbl_ambient(char *oldambient)
735{
736 int rc;
737 struct netlbl_audit nai;
738
739 smk_netlabel_audit_set(&nai);
740
741 if (oldambient != NULL) {
742 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
743 if (rc != 0)
744 printk(KERN_WARNING "%s:%d remove rc = %d\n",
745 __func__, __LINE__, rc);
746 }
747 if (smack_net_ambient == NULL)
748 smack_net_ambient = &smack_known_floor;
749
750 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
751 NULL, NULL, &nai);
752 if (rc != 0)
753 printk(KERN_WARNING "%s:%d add rc = %d\n",
754 __func__, __LINE__, rc);
755}
756
757/*
758 * Seq_file read operations for /smack/cipso
759 */
760
761static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
762{
763 return smk_seq_start(s, pos, &smack_known_list);
764}
765
766static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
767{
768 return smk_seq_next(s, v, pos, &smack_known_list);
769}
770
771/*
772 * Print cipso labels in format:
773 * label level[/cat[,cat]]
774 */
775static int cipso_seq_show(struct seq_file *s, void *v)
776{
777 struct list_head *list = v;
778 struct smack_known *skp =
779 list_entry(list, struct smack_known, list);
780 struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
781 char sep = '/';
782 int i;
783
784 /*
785 * Don't show a label that could not have been set using
786 * /smack/cipso. This is in support of the notion that
787 * anything read from /smack/cipso ought to be writeable
788 * to /smack/cipso.
789 *
790 * /smack/cipso2 should be used instead.
791 */
792 if (strlen(skp->smk_known) >= SMK_LABELLEN)
793 return 0;
794
795 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
796
797 for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0;
798 i = netlbl_secattr_catmap_walk(cmp, i + 1)) {
799 seq_printf(s, "%c%d", sep, i);
800 sep = ',';
801 }
802
803 seq_putc(s, '\n');
804
805 return 0;
806}
807
808static const struct seq_operations cipso_seq_ops = {
809 .start = cipso_seq_start,
810 .next = cipso_seq_next,
811 .show = cipso_seq_show,
812 .stop = smk_seq_stop,
813};
814
815/**
816 * smk_open_cipso - open() for /smack/cipso
817 * @inode: inode structure representing file
818 * @file: "cipso" file pointer
819 *
820 * Connect our cipso_seq_* operations with /smack/cipso
821 * file_operations
822 */
823static int smk_open_cipso(struct inode *inode, struct file *file)
824{
825 return seq_open(file, &cipso_seq_ops);
826}
827
828/**
829 * smk_set_cipso - do the work for write() for cipso and cipso2
830 * @file: file pointer, not actually used
831 * @buf: where to get the data from
832 * @count: bytes sent
833 * @ppos: where to start
834 * @format: /smack/cipso or /smack/cipso2
835 *
836 * Accepts only one cipso rule per write call.
837 * Returns number of bytes written or error code, as appropriate
838 */
839static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
840 size_t count, loff_t *ppos, int format)
841{
842 struct smack_known *skp;
843 struct netlbl_lsm_secattr ncats;
844 char mapcatset[SMK_CIPSOLEN];
845 int maplevel;
846 unsigned int cat;
847 int catlen;
848 ssize_t rc = -EINVAL;
849 char *data = NULL;
850 char *rule;
851 int ret;
852 int i;
853
854 /*
855 * Must have privilege.
856 * No partial writes.
857 * Enough data must be present.
858 */
859 if (!smack_privileged(CAP_MAC_ADMIN))
860 return -EPERM;
861 if (*ppos != 0)
862 return -EINVAL;
863 if (format == SMK_FIXED24_FMT &&
864 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
865 return -EINVAL;
866
867 data = kzalloc(count + 1, GFP_KERNEL);
868 if (data == NULL)
869 return -ENOMEM;
870
871 if (copy_from_user(data, buf, count) != 0) {
872 rc = -EFAULT;
873 goto unlockedout;
874 }
875
876 data[count] = '\0';
877 rule = data;
878 /*
879 * Only allow one writer at a time. Writes should be
880 * quite rare and small in any case.
881 */
882 mutex_lock(&smack_cipso_lock);
883
884 skp = smk_import_entry(rule, 0);
885 if (skp == NULL)
886 goto out;
887
888 if (format == SMK_FIXED24_FMT)
889 rule += SMK_LABELLEN;
890 else
891 rule += strlen(skp->smk_known) + 1;
892
893 ret = sscanf(rule, "%d", &maplevel);
894 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
895 goto out;
896
897 rule += SMK_DIGITLEN;
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 ret = sscanf(rule, "%u", &cat);
911 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
912 goto out;
913
914 smack_catset_bit(cat, mapcatset);
915 }
916
917 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
918 if (rc >= 0) {
919 netlbl_secattr_catmap_free(skp->smk_netlabel.attr.mls.cat);
920 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
921 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
922 rc = count;
923 }
924
925out:
926 mutex_unlock(&smack_cipso_lock);
927unlockedout:
928 kfree(data);
929 return rc;
930}
931
932/**
933 * smk_write_cipso - write() for /smack/cipso
934 * @file: file pointer, not actually used
935 * @buf: where to get the data from
936 * @count: bytes sent
937 * @ppos: where to start
938 *
939 * Accepts only one cipso rule per write call.
940 * Returns number of bytes written or error code, as appropriate
941 */
942static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
943 size_t count, loff_t *ppos)
944{
945 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
946}
947
948static const struct file_operations smk_cipso_ops = {
949 .open = smk_open_cipso,
950 .read = seq_read,
951 .llseek = seq_lseek,
952 .write = smk_write_cipso,
953 .release = seq_release,
954};
955
956/*
957 * Seq_file read operations for /smack/cipso2
958 */
959
960/*
961 * Print cipso labels in format:
962 * label level[/cat[,cat]]
963 */
964static int cipso2_seq_show(struct seq_file *s, void *v)
965{
966 struct list_head *list = v;
967 struct smack_known *skp =
968 list_entry(list, struct smack_known, list);
969 struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
970 char sep = '/';
971 int i;
972
973 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
974
975 for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0;
976 i = netlbl_secattr_catmap_walk(cmp, i + 1)) {
977 seq_printf(s, "%c%d", sep, i);
978 sep = ',';
979 }
980
981 seq_putc(s, '\n');
982
983 return 0;
984}
985
986static const struct seq_operations cipso2_seq_ops = {
987 .start = cipso_seq_start,
988 .next = cipso_seq_next,
989 .show = cipso2_seq_show,
990 .stop = smk_seq_stop,
991};
992
993/**
994 * smk_open_cipso2 - open() for /smack/cipso2
995 * @inode: inode structure representing file
996 * @file: "cipso2" file pointer
997 *
998 * Connect our cipso_seq_* operations with /smack/cipso2
999 * file_operations
1000 */
1001static int smk_open_cipso2(struct inode *inode, struct file *file)
1002{
1003 return seq_open(file, &cipso2_seq_ops);
1004}
1005
1006/**
1007 * smk_write_cipso2 - write() for /smack/cipso2
1008 * @file: file pointer, not actually used
1009 * @buf: where to get the data from
1010 * @count: bytes sent
1011 * @ppos: where to start
1012 *
1013 * Accepts only one cipso rule per write call.
1014 * Returns number of bytes written or error code, as appropriate
1015 */
1016static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1017 size_t count, loff_t *ppos)
1018{
1019 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1020}
1021
1022static const struct file_operations smk_cipso2_ops = {
1023 .open = smk_open_cipso2,
1024 .read = seq_read,
1025 .llseek = seq_lseek,
1026 .write = smk_write_cipso2,
1027 .release = seq_release,
1028};
1029
1030/*
1031 * Seq_file read operations for /smack/netlabel
1032 */
1033
1034static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
1035{
1036 return smk_seq_start(s, pos, &smk_netlbladdr_list);
1037}
1038
1039static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1040{
1041 return smk_seq_next(s, v, pos, &smk_netlbladdr_list);
1042}
1043#define BEBITS (sizeof(__be32) * 8)
1044
1045/*
1046 * Print host/label pairs
1047 */
1048static int netlbladdr_seq_show(struct seq_file *s, void *v)
1049{
1050 struct list_head *list = v;
1051 struct smk_netlbladdr *skp =
1052 list_entry(list, struct smk_netlbladdr, list);
1053 unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
1054 int maskn;
1055 u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
1056
1057 for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++);
1058
1059 seq_printf(s, "%u.%u.%u.%u/%d %s\n",
1060 hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label);
1061
1062 return 0;
1063}
1064
1065static const struct seq_operations netlbladdr_seq_ops = {
1066 .start = netlbladdr_seq_start,
1067 .next = netlbladdr_seq_next,
1068 .show = netlbladdr_seq_show,
1069 .stop = smk_seq_stop,
1070};
1071
1072/**
1073 * smk_open_netlbladdr - open() for /smack/netlabel
1074 * @inode: inode structure representing file
1075 * @file: "netlabel" file pointer
1076 *
1077 * Connect our netlbladdr_seq_* operations with /smack/netlabel
1078 * file_operations
1079 */
1080static int smk_open_netlbladdr(struct inode *inode, struct file *file)
1081{
1082 return seq_open(file, &netlbladdr_seq_ops);
1083}
1084
1085/**
1086 * smk_netlbladdr_insert
1087 * @new : netlabel to insert
1088 *
1089 * This helper insert netlabel in the smack_netlbladdrs list
1090 * sorted by netmask length (longest to smallest)
1091 * locked by &smk_netlbladdr_lock in smk_write_netlbladdr
1092 *
1093 */
1094static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
1095{
1096 struct smk_netlbladdr *m, *m_next;
1097
1098 if (list_empty(&smk_netlbladdr_list)) {
1099 list_add_rcu(&new->list, &smk_netlbladdr_list);
1100 return;
1101 }
1102
1103 m = list_entry_rcu(smk_netlbladdr_list.next,
1104 struct smk_netlbladdr, list);
1105
1106 /* the comparison '>' is a bit hacky, but works */
1107 if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
1108 list_add_rcu(&new->list, &smk_netlbladdr_list);
1109 return;
1110 }
1111
1112 list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
1113 if (list_is_last(&m->list, &smk_netlbladdr_list)) {
1114 list_add_rcu(&new->list, &m->list);
1115 return;
1116 }
1117 m_next = list_entry_rcu(m->list.next,
1118 struct smk_netlbladdr, list);
1119 if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
1120 list_add_rcu(&new->list, &m->list);
1121 return;
1122 }
1123 }
1124}
1125
1126
1127/**
1128 * smk_write_netlbladdr - write() for /smack/netlabel
1129 * @file: file pointer, not actually used
1130 * @buf: where to get the data from
1131 * @count: bytes sent
1132 * @ppos: where to start
1133 *
1134 * Accepts only one netlbladdr per write call.
1135 * Returns number of bytes written or error code, as appropriate
1136 */
1137static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
1138 size_t count, loff_t *ppos)
1139{
1140 struct smk_netlbladdr *skp;
1141 struct sockaddr_in newname;
1142 char *smack;
1143 char *sp;
1144 char *data;
1145 char *host = (char *)&newname.sin_addr.s_addr;
1146 int rc;
1147 struct netlbl_audit audit_info;
1148 struct in_addr mask;
1149 unsigned int m;
1150 int found;
1151 u32 mask_bits = (1<<31);
1152 __be32 nsa;
1153 u32 temp_mask;
1154
1155 /*
1156 * Must have privilege.
1157 * No partial writes.
1158 * Enough data must be present.
1159 * "<addr/mask, as a.b.c.d/e><space><label>"
1160 * "<addr, as a.b.c.d><space><label>"
1161 */
1162 if (!smack_privileged(CAP_MAC_ADMIN))
1163 return -EPERM;
1164 if (*ppos != 0)
1165 return -EINVAL;
1166 if (count < SMK_NETLBLADDRMIN)
1167 return -EINVAL;
1168
1169 data = kzalloc(count + 1, GFP_KERNEL);
1170 if (data == NULL)
1171 return -ENOMEM;
1172
1173 if (copy_from_user(data, buf, count) != 0) {
1174 rc = -EFAULT;
1175 goto free_data_out;
1176 }
1177
1178 smack = kzalloc(count + 1, GFP_KERNEL);
1179 if (smack == NULL) {
1180 rc = -ENOMEM;
1181 goto free_data_out;
1182 }
1183
1184 data[count] = '\0';
1185
1186 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
1187 &host[0], &host[1], &host[2], &host[3], &m, smack);
1188 if (rc != 6) {
1189 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1190 &host[0], &host[1], &host[2], &host[3], smack);
1191 if (rc != 5) {
1192 rc = -EINVAL;
1193 goto free_out;
1194 }
1195 m = BEBITS;
1196 }
1197 if (m > 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 sp = smk_import(smack, 0);
1207 if (sp == NULL) {
1208 rc = -EINVAL;
1209 goto free_out;
1210 }
1211 } else {
1212 /* check known options */
1213 if (strcmp(smack, smack_cipso_option) == 0)
1214 sp = (char *)smack_cipso_option;
1215 else {
1216 rc = -EINVAL;
1217 goto free_out;
1218 }
1219 }
1220
1221 for (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_netlbladdr_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(skp, &smk_netlbladdr_list, list) {
1238 if (skp->smk_host.sin_addr.s_addr == nsa &&
1239 skp->smk_mask.s_addr == mask.s_addr) {
1240 found = 1;
1241 break;
1242 }
1243 }
1244 smk_netlabel_audit_set(&audit_info);
1245
1246 if (found == 0) {
1247 skp = kzalloc(sizeof(*skp), GFP_KERNEL);
1248 if (skp == NULL)
1249 rc = -ENOMEM;
1250 else {
1251 rc = 0;
1252 skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
1253 skp->smk_mask.s_addr = mask.s_addr;
1254 skp->smk_label = sp;
1255 smk_netlbladdr_insert(skp);
1256 }
1257 } else {
1258 /* we delete the unlabeled entry, only if the previous label
1259 * wasn't the special CIPSO option */
1260 if (skp->smk_label != smack_cipso_option)
1261 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1262 &skp->smk_host.sin_addr, &skp->smk_mask,
1263 PF_INET, &audit_info);
1264 else
1265 rc = 0;
1266 skp->smk_label = sp;
1267 }
1268
1269 /*
1270 * Now tell netlabel about the single label nature of
1271 * this host so that incoming packets get labeled.
1272 * but only if we didn't get the special CIPSO option
1273 */
1274 if (rc == 0 && sp != smack_cipso_option)
1275 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1276 &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
1277 smack_to_secid(skp->smk_label), &audit_info);
1278
1279 if (rc == 0)
1280 rc = count;
1281
1282 mutex_unlock(&smk_netlbladdr_lock);
1283
1284free_out:
1285 kfree(smack);
1286free_data_out:
1287 kfree(data);
1288
1289 return rc;
1290}
1291
1292static const struct file_operations smk_netlbladdr_ops = {
1293 .open = smk_open_netlbladdr,
1294 .read = seq_read,
1295 .llseek = seq_lseek,
1296 .write = smk_write_netlbladdr,
1297 .release = seq_release,
1298};
1299
1300/**
1301 * smk_read_doi - read() for /smack/doi
1302 * @filp: file pointer, not actually used
1303 * @buf: where to put the result
1304 * @count: maximum to send along
1305 * @ppos: where to start
1306 *
1307 * Returns number of bytes read or error code, as appropriate
1308 */
1309static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1310 size_t count, loff_t *ppos)
1311{
1312 char temp[80];
1313 ssize_t rc;
1314
1315 if (*ppos != 0)
1316 return 0;
1317
1318 sprintf(temp, "%d", smk_cipso_doi_value);
1319 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1320
1321 return rc;
1322}
1323
1324/**
1325 * smk_write_doi - write() for /smack/doi
1326 * @file: file pointer, not actually used
1327 * @buf: where to get the data from
1328 * @count: bytes sent
1329 * @ppos: where to start
1330 *
1331 * Returns number of bytes written or error code, as appropriate
1332 */
1333static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1334 size_t count, loff_t *ppos)
1335{
1336 char temp[80];
1337 int i;
1338
1339 if (!smack_privileged(CAP_MAC_ADMIN))
1340 return -EPERM;
1341
1342 if (count >= sizeof(temp) || count == 0)
1343 return -EINVAL;
1344
1345 if (copy_from_user(temp, buf, count) != 0)
1346 return -EFAULT;
1347
1348 temp[count] = '\0';
1349
1350 if (sscanf(temp, "%d", &i) != 1)
1351 return -EINVAL;
1352
1353 smk_cipso_doi_value = i;
1354
1355 smk_cipso_doi();
1356
1357 return count;
1358}
1359
1360static const struct file_operations smk_doi_ops = {
1361 .read = smk_read_doi,
1362 .write = smk_write_doi,
1363 .llseek = default_llseek,
1364};
1365
1366/**
1367 * smk_read_direct - read() for /smack/direct
1368 * @filp: file pointer, not actually used
1369 * @buf: where to put the result
1370 * @count: maximum to send along
1371 * @ppos: where to start
1372 *
1373 * Returns number of bytes read or error code, as appropriate
1374 */
1375static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1376 size_t count, loff_t *ppos)
1377{
1378 char temp[80];
1379 ssize_t rc;
1380
1381 if (*ppos != 0)
1382 return 0;
1383
1384 sprintf(temp, "%d", smack_cipso_direct);
1385 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1386
1387 return rc;
1388}
1389
1390/**
1391 * smk_write_direct - write() for /smack/direct
1392 * @file: file pointer, not actually used
1393 * @buf: where to get the data from
1394 * @count: bytes sent
1395 * @ppos: where to start
1396 *
1397 * Returns number of bytes written or error code, as appropriate
1398 */
1399static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1400 size_t count, loff_t *ppos)
1401{
1402 struct smack_known *skp;
1403 char temp[80];
1404 int i;
1405
1406 if (!smack_privileged(CAP_MAC_ADMIN))
1407 return -EPERM;
1408
1409 if (count >= sizeof(temp) || count == 0)
1410 return -EINVAL;
1411
1412 if (copy_from_user(temp, buf, count) != 0)
1413 return -EFAULT;
1414
1415 temp[count] = '\0';
1416
1417 if (sscanf(temp, "%d", &i) != 1)
1418 return -EINVAL;
1419
1420 /*
1421 * Don't do anything if the value hasn't actually changed.
1422 * If it is changing reset the level on entries that were
1423 * set up to be direct when they were created.
1424 */
1425 if (smack_cipso_direct != i) {
1426 mutex_lock(&smack_known_lock);
1427 list_for_each_entry_rcu(skp, &smack_known_list, list)
1428 if (skp->smk_netlabel.attr.mls.lvl ==
1429 smack_cipso_direct)
1430 skp->smk_netlabel.attr.mls.lvl = i;
1431 smack_cipso_direct = i;
1432 mutex_unlock(&smack_known_lock);
1433 }
1434
1435 return count;
1436}
1437
1438static const struct file_operations smk_direct_ops = {
1439 .read = smk_read_direct,
1440 .write = smk_write_direct,
1441 .llseek = default_llseek,
1442};
1443
1444/**
1445 * smk_read_mapped - read() for /smack/mapped
1446 * @filp: file pointer, not actually used
1447 * @buf: where to put the result
1448 * @count: maximum to send along
1449 * @ppos: where to start
1450 *
1451 * Returns number of bytes read or error code, as appropriate
1452 */
1453static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1454 size_t count, loff_t *ppos)
1455{
1456 char temp[80];
1457 ssize_t rc;
1458
1459 if (*ppos != 0)
1460 return 0;
1461
1462 sprintf(temp, "%d", smack_cipso_mapped);
1463 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1464
1465 return rc;
1466}
1467
1468/**
1469 * smk_write_mapped - write() for /smack/mapped
1470 * @file: file pointer, not actually used
1471 * @buf: where to get the data from
1472 * @count: bytes sent
1473 * @ppos: where to start
1474 *
1475 * Returns number of bytes written or error code, as appropriate
1476 */
1477static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1478 size_t count, loff_t *ppos)
1479{
1480 struct smack_known *skp;
1481 char temp[80];
1482 int i;
1483
1484 if (!smack_privileged(CAP_MAC_ADMIN))
1485 return -EPERM;
1486
1487 if (count >= sizeof(temp) || count == 0)
1488 return -EINVAL;
1489
1490 if (copy_from_user(temp, buf, count) != 0)
1491 return -EFAULT;
1492
1493 temp[count] = '\0';
1494
1495 if (sscanf(temp, "%d", &i) != 1)
1496 return -EINVAL;
1497
1498 /*
1499 * Don't do anything if the value hasn't actually changed.
1500 * If it is changing reset the level on entries that were
1501 * set up to be mapped when they were created.
1502 */
1503 if (smack_cipso_mapped != i) {
1504 mutex_lock(&smack_known_lock);
1505 list_for_each_entry_rcu(skp, &smack_known_list, list)
1506 if (skp->smk_netlabel.attr.mls.lvl ==
1507 smack_cipso_mapped)
1508 skp->smk_netlabel.attr.mls.lvl = i;
1509 smack_cipso_mapped = i;
1510 mutex_unlock(&smack_known_lock);
1511 }
1512
1513 return count;
1514}
1515
1516static const struct file_operations smk_mapped_ops = {
1517 .read = smk_read_mapped,
1518 .write = smk_write_mapped,
1519 .llseek = default_llseek,
1520};
1521
1522/**
1523 * smk_read_ambient - read() for /smack/ambient
1524 * @filp: file pointer, not actually used
1525 * @buf: where to put the result
1526 * @cn: maximum to send along
1527 * @ppos: where to start
1528 *
1529 * Returns number of bytes read or error code, as appropriate
1530 */
1531static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1532 size_t cn, loff_t *ppos)
1533{
1534 ssize_t rc;
1535 int asize;
1536
1537 if (*ppos != 0)
1538 return 0;
1539 /*
1540 * Being careful to avoid a problem in the case where
1541 * smack_net_ambient gets changed in midstream.
1542 */
1543 mutex_lock(&smack_ambient_lock);
1544
1545 asize = strlen(smack_net_ambient->smk_known) + 1;
1546
1547 if (cn >= asize)
1548 rc = simple_read_from_buffer(buf, cn, ppos,
1549 smack_net_ambient->smk_known,
1550 asize);
1551 else
1552 rc = -EINVAL;
1553
1554 mutex_unlock(&smack_ambient_lock);
1555
1556 return rc;
1557}
1558
1559/**
1560 * smk_write_ambient - write() for /smack/ambient
1561 * @file: file pointer, not actually used
1562 * @buf: where to get the data from
1563 * @count: bytes sent
1564 * @ppos: where to start
1565 *
1566 * Returns number of bytes written or error code, as appropriate
1567 */
1568static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1569 size_t count, loff_t *ppos)
1570{
1571 struct smack_known *skp;
1572 char *oldambient;
1573 char *data;
1574 int rc = count;
1575
1576 if (!smack_privileged(CAP_MAC_ADMIN))
1577 return -EPERM;
1578
1579 data = kzalloc(count + 1, GFP_KERNEL);
1580 if (data == NULL)
1581 return -ENOMEM;
1582
1583 if (copy_from_user(data, buf, count) != 0) {
1584 rc = -EFAULT;
1585 goto out;
1586 }
1587
1588 skp = smk_import_entry(data, count);
1589 if (skp == NULL) {
1590 rc = -EINVAL;
1591 goto out;
1592 }
1593
1594 mutex_lock(&smack_ambient_lock);
1595
1596 oldambient = smack_net_ambient->smk_known;
1597 smack_net_ambient = skp;
1598 smk_unlbl_ambient(oldambient);
1599
1600 mutex_unlock(&smack_ambient_lock);
1601
1602out:
1603 kfree(data);
1604 return rc;
1605}
1606
1607static const struct file_operations smk_ambient_ops = {
1608 .read = smk_read_ambient,
1609 .write = smk_write_ambient,
1610 .llseek = default_llseek,
1611};
1612
1613/**
1614 * smk_read_onlycap - read() for smackfs/onlycap
1615 * @filp: file pointer, not actually used
1616 * @buf: where to put the result
1617 * @cn: maximum to send along
1618 * @ppos: where to start
1619 *
1620 * Returns number of bytes read or error code, as appropriate
1621 */
1622static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
1623 size_t cn, loff_t *ppos)
1624{
1625 char *smack = "";
1626 ssize_t rc = -EINVAL;
1627 int asize;
1628
1629 if (*ppos != 0)
1630 return 0;
1631
1632 if (smack_onlycap != NULL)
1633 smack = smack_onlycap->smk_known;
1634
1635 asize = strlen(smack) + 1;
1636
1637 if (cn >= asize)
1638 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
1639
1640 return rc;
1641}
1642
1643/**
1644 * smk_write_onlycap - write() for smackfs/onlycap
1645 * @file: file pointer, not actually used
1646 * @buf: where to get the data from
1647 * @count: bytes sent
1648 * @ppos: where to start
1649 *
1650 * Returns number of bytes written or error code, as appropriate
1651 */
1652static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1653 size_t count, loff_t *ppos)
1654{
1655 char *data;
1656 struct smack_known *skp = smk_of_task(current->cred->security);
1657 int rc = count;
1658
1659 if (!smack_privileged(CAP_MAC_ADMIN))
1660 return -EPERM;
1661
1662 /*
1663 * This can be done using smk_access() but is done
1664 * explicitly for clarity. The smk_access() implementation
1665 * would use smk_access(smack_onlycap, MAY_WRITE)
1666 */
1667 if (smack_onlycap != NULL && smack_onlycap != skp)
1668 return -EPERM;
1669
1670 data = kzalloc(count, GFP_KERNEL);
1671 if (data == NULL)
1672 return -ENOMEM;
1673
1674 /*
1675 * Should the null string be passed in unset the onlycap value.
1676 * This seems like something to be careful with as usually
1677 * smk_import only expects to return NULL for errors. It
1678 * is usually the case that a nullstring or "\n" would be
1679 * bad to pass to smk_import but in fact this is useful here.
1680 *
1681 * smk_import will also reject a label beginning with '-',
1682 * so "-usecapabilities" will also work.
1683 */
1684 if (copy_from_user(data, buf, count) != 0)
1685 rc = -EFAULT;
1686 else
1687 smack_onlycap = smk_import_entry(data, count);
1688
1689 kfree(data);
1690 return rc;
1691}
1692
1693static const struct file_operations smk_onlycap_ops = {
1694 .read = smk_read_onlycap,
1695 .write = smk_write_onlycap,
1696 .llseek = default_llseek,
1697};
1698
1699/**
1700 * smk_read_logging - read() for /smack/logging
1701 * @filp: file pointer, not actually used
1702 * @buf: where to put the result
1703 * @cn: maximum to send along
1704 * @ppos: where to start
1705 *
1706 * Returns number of bytes read or error code, as appropriate
1707 */
1708static ssize_t smk_read_logging(struct file *filp, char __user *buf,
1709 size_t count, loff_t *ppos)
1710{
1711 char temp[32];
1712 ssize_t rc;
1713
1714 if (*ppos != 0)
1715 return 0;
1716
1717 sprintf(temp, "%d\n", log_policy);
1718 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1719 return rc;
1720}
1721
1722/**
1723 * smk_write_logging - write() for /smack/logging
1724 * @file: file pointer, not actually used
1725 * @buf: where to get the data from
1726 * @count: bytes sent
1727 * @ppos: where to start
1728 *
1729 * Returns number of bytes written or error code, as appropriate
1730 */
1731static ssize_t smk_write_logging(struct file *file, const char __user *buf,
1732 size_t count, loff_t *ppos)
1733{
1734 char temp[32];
1735 int i;
1736
1737 if (!smack_privileged(CAP_MAC_ADMIN))
1738 return -EPERM;
1739
1740 if (count >= sizeof(temp) || count == 0)
1741 return -EINVAL;
1742
1743 if (copy_from_user(temp, buf, count) != 0)
1744 return -EFAULT;
1745
1746 temp[count] = '\0';
1747
1748 if (sscanf(temp, "%d", &i) != 1)
1749 return -EINVAL;
1750 if (i < 0 || i > 3)
1751 return -EINVAL;
1752 log_policy = i;
1753 return count;
1754}
1755
1756
1757
1758static const struct file_operations smk_logging_ops = {
1759 .read = smk_read_logging,
1760 .write = smk_write_logging,
1761 .llseek = default_llseek,
1762};
1763
1764/*
1765 * Seq_file read operations for /smack/load-self
1766 */
1767
1768static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
1769{
1770 struct task_smack *tsp = current_security();
1771
1772 return smk_seq_start(s, pos, &tsp->smk_rules);
1773}
1774
1775static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
1776{
1777 struct task_smack *tsp = current_security();
1778
1779 return smk_seq_next(s, v, pos, &tsp->smk_rules);
1780}
1781
1782static int load_self_seq_show(struct seq_file *s, void *v)
1783{
1784 struct list_head *list = v;
1785 struct smack_rule *srp =
1786 list_entry(list, struct smack_rule, list);
1787
1788 smk_rule_show(s, srp, SMK_LABELLEN);
1789
1790 return 0;
1791}
1792
1793static const struct seq_operations load_self_seq_ops = {
1794 .start = load_self_seq_start,
1795 .next = load_self_seq_next,
1796 .show = load_self_seq_show,
1797 .stop = smk_seq_stop,
1798};
1799
1800
1801/**
1802 * smk_open_load_self - open() for /smack/load-self2
1803 * @inode: inode structure representing file
1804 * @file: "load" file pointer
1805 *
1806 * For reading, use load_seq_* seq_file reading operations.
1807 */
1808static int smk_open_load_self(struct inode *inode, struct file *file)
1809{
1810 return seq_open(file, &load_self_seq_ops);
1811}
1812
1813/**
1814 * smk_write_load_self - write() for /smack/load-self
1815 * @file: file pointer, not actually used
1816 * @buf: where to get the data from
1817 * @count: bytes sent
1818 * @ppos: where to start - must be 0
1819 *
1820 */
1821static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
1822 size_t count, loff_t *ppos)
1823{
1824 struct task_smack *tsp = current_security();
1825
1826 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
1827 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
1828}
1829
1830static const struct file_operations smk_load_self_ops = {
1831 .open = smk_open_load_self,
1832 .read = seq_read,
1833 .llseek = seq_lseek,
1834 .write = smk_write_load_self,
1835 .release = seq_release,
1836};
1837
1838/**
1839 * smk_user_access - handle access check transaction
1840 * @file: file pointer
1841 * @buf: data from user space
1842 * @count: bytes sent
1843 * @ppos: where to start - must be 0
1844 */
1845static ssize_t smk_user_access(struct file *file, const char __user *buf,
1846 size_t count, loff_t *ppos, int format)
1847{
1848 struct smack_parsed_rule rule;
1849 char *data;
1850 int res;
1851
1852 data = simple_transaction_get(file, buf, count);
1853 if (IS_ERR(data))
1854 return PTR_ERR(data);
1855
1856 if (format == SMK_FIXED24_FMT) {
1857 if (count < SMK_LOADLEN)
1858 return -EINVAL;
1859 res = smk_parse_rule(data, &rule, 0);
1860 } else {
1861 /*
1862 * simple_transaction_get() returns null-terminated data
1863 */
1864 res = smk_parse_long_rule(data, &rule, 0, 3);
1865 }
1866
1867 if (res >= 0)
1868 res = smk_access(rule.smk_subject, rule.smk_object,
1869 rule.smk_access1, NULL);
1870 else if (res != -ENOENT)
1871 return -EINVAL;
1872
1873 data[0] = res == 0 ? '1' : '0';
1874 data[1] = '\0';
1875
1876 simple_transaction_set(file, 2);
1877
1878 if (format == SMK_FIXED24_FMT)
1879 return SMK_LOADLEN;
1880 return count;
1881}
1882
1883/**
1884 * smk_write_access - handle access check transaction
1885 * @file: file pointer
1886 * @buf: data from user space
1887 * @count: bytes sent
1888 * @ppos: where to start - must be 0
1889 */
1890static ssize_t smk_write_access(struct file *file, const char __user *buf,
1891 size_t count, loff_t *ppos)
1892{
1893 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
1894}
1895
1896static const struct file_operations smk_access_ops = {
1897 .write = smk_write_access,
1898 .read = simple_transaction_read,
1899 .release = simple_transaction_release,
1900 .llseek = generic_file_llseek,
1901};
1902
1903
1904/*
1905 * Seq_file read operations for /smack/load2
1906 */
1907
1908static int load2_seq_show(struct seq_file *s, void *v)
1909{
1910 struct list_head *list = v;
1911 struct smack_master_list *smlp =
1912 list_entry(list, struct smack_master_list, list);
1913
1914 smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);
1915
1916 return 0;
1917}
1918
1919static const struct seq_operations load2_seq_ops = {
1920 .start = load2_seq_start,
1921 .next = load2_seq_next,
1922 .show = load2_seq_show,
1923 .stop = smk_seq_stop,
1924};
1925
1926/**
1927 * smk_open_load2 - open() for /smack/load2
1928 * @inode: inode structure representing file
1929 * @file: "load2" file pointer
1930 *
1931 * For reading, use load2_seq_* seq_file reading operations.
1932 */
1933static int smk_open_load2(struct inode *inode, struct file *file)
1934{
1935 return seq_open(file, &load2_seq_ops);
1936}
1937
1938/**
1939 * smk_write_load2 - write() for /smack/load2
1940 * @file: file pointer, not actually used
1941 * @buf: where to get the data from
1942 * @count: bytes sent
1943 * @ppos: where to start - must be 0
1944 *
1945 */
1946static ssize_t smk_write_load2(struct file *file, const char __user *buf,
1947 size_t count, loff_t *ppos)
1948{
1949 /*
1950 * Must have privilege.
1951 */
1952 if (!smack_privileged(CAP_MAC_ADMIN))
1953 return -EPERM;
1954
1955 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
1956 SMK_LONG_FMT);
1957}
1958
1959static const struct file_operations smk_load2_ops = {
1960 .open = smk_open_load2,
1961 .read = seq_read,
1962 .llseek = seq_lseek,
1963 .write = smk_write_load2,
1964 .release = seq_release,
1965};
1966
1967/*
1968 * Seq_file read operations for /smack/load-self2
1969 */
1970
1971static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
1972{
1973 struct task_smack *tsp = current_security();
1974
1975 return smk_seq_start(s, pos, &tsp->smk_rules);
1976}
1977
1978static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
1979{
1980 struct task_smack *tsp = current_security();
1981
1982 return smk_seq_next(s, v, pos, &tsp->smk_rules);
1983}
1984
1985static int load_self2_seq_show(struct seq_file *s, void *v)
1986{
1987 struct list_head *list = v;
1988 struct smack_rule *srp =
1989 list_entry(list, struct smack_rule, list);
1990
1991 smk_rule_show(s, srp, SMK_LONGLABEL);
1992
1993 return 0;
1994}
1995
1996static const struct seq_operations load_self2_seq_ops = {
1997 .start = load_self2_seq_start,
1998 .next = load_self2_seq_next,
1999 .show = load_self2_seq_show,
2000 .stop = smk_seq_stop,
2001};
2002
2003/**
2004 * smk_open_load_self2 - open() for /smack/load-self2
2005 * @inode: inode structure representing file
2006 * @file: "load" file pointer
2007 *
2008 * For reading, use load_seq_* seq_file reading operations.
2009 */
2010static int smk_open_load_self2(struct inode *inode, struct file *file)
2011{
2012 return seq_open(file, &load_self2_seq_ops);
2013}
2014
2015/**
2016 * smk_write_load_self2 - write() for /smack/load-self2
2017 * @file: file pointer, not actually used
2018 * @buf: where to get the data from
2019 * @count: bytes sent
2020 * @ppos: where to start - must be 0
2021 *
2022 */
2023static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2024 size_t count, loff_t *ppos)
2025{
2026 struct task_smack *tsp = current_security();
2027
2028 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2029 &tsp->smk_rules_lock, SMK_LONG_FMT);
2030}
2031
2032static const struct file_operations smk_load_self2_ops = {
2033 .open = smk_open_load_self2,
2034 .read = seq_read,
2035 .llseek = seq_lseek,
2036 .write = smk_write_load_self2,
2037 .release = seq_release,
2038};
2039
2040/**
2041 * smk_write_access2 - handle access check transaction
2042 * @file: file pointer
2043 * @buf: data from user space
2044 * @count: bytes sent
2045 * @ppos: where to start - must be 0
2046 */
2047static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2048 size_t count, loff_t *ppos)
2049{
2050 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2051}
2052
2053static const struct file_operations smk_access2_ops = {
2054 .write = smk_write_access2,
2055 .read = simple_transaction_read,
2056 .release = simple_transaction_release,
2057 .llseek = generic_file_llseek,
2058};
2059
2060/**
2061 * smk_write_revoke_subj - write() for /smack/revoke-subject
2062 * @file: file pointer
2063 * @buf: data from user space
2064 * @count: bytes sent
2065 * @ppos: where to start - must be 0
2066 */
2067static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2068 size_t count, loff_t *ppos)
2069{
2070 char *data = NULL;
2071 const char *cp = NULL;
2072 struct smack_known *skp;
2073 struct smack_rule *sp;
2074 struct list_head *rule_list;
2075 struct mutex *rule_lock;
2076 int rc = count;
2077
2078 if (*ppos != 0)
2079 return -EINVAL;
2080
2081 if (!smack_privileged(CAP_MAC_ADMIN))
2082 return -EPERM;
2083
2084 if (count == 0 || count > SMK_LONGLABEL)
2085 return -EINVAL;
2086
2087 data = kzalloc(count, GFP_KERNEL);
2088 if (data == NULL)
2089 return -ENOMEM;
2090
2091 if (copy_from_user(data, buf, count) != 0) {
2092 rc = -EFAULT;
2093 goto free_out;
2094 }
2095
2096 cp = smk_parse_smack(data, count);
2097 if (cp == NULL) {
2098 rc = -EINVAL;
2099 goto free_out;
2100 }
2101
2102 skp = smk_find_entry(cp);
2103 if (skp == NULL)
2104 goto free_out;
2105
2106 rule_list = &skp->smk_rules;
2107 rule_lock = &skp->smk_rules_lock;
2108
2109 mutex_lock(rule_lock);
2110
2111 list_for_each_entry_rcu(sp, rule_list, list)
2112 sp->smk_access = 0;
2113
2114 mutex_unlock(rule_lock);
2115
2116free_out:
2117 kfree(data);
2118 kfree(cp);
2119 return rc;
2120}
2121
2122static const struct file_operations smk_revoke_subj_ops = {
2123 .write = smk_write_revoke_subj,
2124 .read = simple_transaction_read,
2125 .release = simple_transaction_release,
2126 .llseek = generic_file_llseek,
2127};
2128
2129static struct kset *smackfs_kset;
2130/**
2131 * smk_init_sysfs - initialize /sys/fs/smackfs
2132 *
2133 */
2134static int smk_init_sysfs(void)
2135{
2136 smackfs_kset = kset_create_and_add("smackfs", NULL, fs_kobj);
2137 if (!smackfs_kset)
2138 return -ENOMEM;
2139 return 0;
2140}
2141
2142/**
2143 * smk_write_change_rule - write() for /smack/change-rule
2144 * @file: file pointer
2145 * @buf: data from user space
2146 * @count: bytes sent
2147 * @ppos: where to start - must be 0
2148 */
2149static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2150 size_t count, loff_t *ppos)
2151{
2152 /*
2153 * Must have privilege.
2154 */
2155 if (!smack_privileged(CAP_MAC_ADMIN))
2156 return -EPERM;
2157
2158 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2159 SMK_CHANGE_FMT);
2160}
2161
2162static const struct file_operations smk_change_rule_ops = {
2163 .write = smk_write_change_rule,
2164 .read = simple_transaction_read,
2165 .release = simple_transaction_release,
2166 .llseek = generic_file_llseek,
2167};
2168
2169/**
2170 * smk_read_syslog - read() for smackfs/syslog
2171 * @filp: file pointer, not actually used
2172 * @buf: where to put the result
2173 * @cn: maximum to send along
2174 * @ppos: where to start
2175 *
2176 * Returns number of bytes read or error code, as appropriate
2177 */
2178static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2179 size_t cn, loff_t *ppos)
2180{
2181 struct smack_known *skp;
2182 ssize_t rc = -EINVAL;
2183 int asize;
2184
2185 if (*ppos != 0)
2186 return 0;
2187
2188 if (smack_syslog_label == NULL)
2189 skp = &smack_known_star;
2190 else
2191 skp = smack_syslog_label;
2192
2193 asize = strlen(skp->smk_known) + 1;
2194
2195 if (cn >= asize)
2196 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2197 asize);
2198
2199 return rc;
2200}
2201
2202/**
2203 * smk_write_syslog - write() for smackfs/syslog
2204 * @file: file pointer, not actually used
2205 * @buf: where to get the data from
2206 * @count: bytes sent
2207 * @ppos: where to start
2208 *
2209 * Returns number of bytes written or error code, as appropriate
2210 */
2211static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2212 size_t count, loff_t *ppos)
2213{
2214 char *data;
2215 struct smack_known *skp;
2216 int rc = count;
2217
2218 if (!smack_privileged(CAP_MAC_ADMIN))
2219 return -EPERM;
2220
2221 data = kzalloc(count, GFP_KERNEL);
2222 if (data == NULL)
2223 return -ENOMEM;
2224
2225 if (copy_from_user(data, buf, count) != 0)
2226 rc = -EFAULT;
2227 else {
2228 skp = smk_import_entry(data, count);
2229 if (skp == NULL)
2230 rc = -EINVAL;
2231 else
2232 smack_syslog_label = smk_import_entry(data, count);
2233 }
2234
2235 kfree(data);
2236 return rc;
2237}
2238
2239static const struct file_operations smk_syslog_ops = {
2240 .read = smk_read_syslog,
2241 .write = smk_write_syslog,
2242 .llseek = default_llseek,
2243};
2244
2245
2246/**
2247 * smk_fill_super - fill the smackfs superblock
2248 * @sb: the empty superblock
2249 * @data: unused
2250 * @silent: unused
2251 *
2252 * Fill in the well known entries for the smack filesystem
2253 *
2254 * Returns 0 on success, an error code on failure
2255 */
2256static int smk_fill_super(struct super_block *sb, void *data, int silent)
2257{
2258 int rc;
2259 struct inode *root_inode;
2260
2261 static struct tree_descr smack_files[] = {
2262 [SMK_LOAD] = {
2263 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2264 [SMK_CIPSO] = {
2265 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2266 [SMK_DOI] = {
2267 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2268 [SMK_DIRECT] = {
2269 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2270 [SMK_AMBIENT] = {
2271 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2272 [SMK_NETLBLADDR] = {
2273 "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
2274 [SMK_ONLYCAP] = {
2275 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2276 [SMK_LOGGING] = {
2277 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2278 [SMK_LOAD_SELF] = {
2279 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2280 [SMK_ACCESSES] = {
2281 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2282 [SMK_MAPPED] = {
2283 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2284 [SMK_LOAD2] = {
2285 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2286 [SMK_LOAD_SELF2] = {
2287 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2288 [SMK_ACCESS2] = {
2289 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2290 [SMK_CIPSO2] = {
2291 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2292 [SMK_REVOKE_SUBJ] = {
2293 "revoke-subject", &smk_revoke_subj_ops,
2294 S_IRUGO|S_IWUSR},
2295 [SMK_CHANGE_RULE] = {
2296 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2297 [SMK_SYSLOG] = {
2298 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2299 /* last one */
2300 {""}
2301 };
2302
2303 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2304 if (rc != 0) {
2305 printk(KERN_ERR "%s failed %d while creating inodes\n",
2306 __func__, rc);
2307 return rc;
2308 }
2309
2310 root_inode = sb->s_root->d_inode;
2311
2312 return 0;
2313}
2314
2315/**
2316 * smk_mount - get the smackfs superblock
2317 * @fs_type: passed along without comment
2318 * @flags: passed along without comment
2319 * @dev_name: passed along without comment
2320 * @data: passed along without comment
2321 *
2322 * Just passes everything along.
2323 *
2324 * Returns what the lower level code does.
2325 */
2326static struct dentry *smk_mount(struct file_system_type *fs_type,
2327 int flags, const char *dev_name, void *data)
2328{
2329 return mount_single(fs_type, flags, data, smk_fill_super);
2330}
2331
2332static struct file_system_type smk_fs_type = {
2333 .name = "smackfs",
2334 .mount = smk_mount,
2335 .kill_sb = kill_litter_super,
2336};
2337
2338static struct vfsmount *smackfs_mount;
2339
2340static int __init smk_preset_netlabel(struct smack_known *skp)
2341{
2342 skp->smk_netlabel.domain = skp->smk_known;
2343 skp->smk_netlabel.flags =
2344 NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2345 return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2346 &skp->smk_netlabel, strlen(skp->smk_known));
2347}
2348
2349/**
2350 * init_smk_fs - get the smackfs superblock
2351 *
2352 * register the smackfs
2353 *
2354 * Do not register smackfs if Smack wasn't enabled
2355 * on boot. We can not put this method normally under the
2356 * smack_init() code path since the security subsystem get
2357 * initialized before the vfs caches.
2358 *
2359 * Returns true if we were not chosen on boot or if
2360 * we were chosen and filesystem registration succeeded.
2361 */
2362static int __init init_smk_fs(void)
2363{
2364 int err;
2365 int rc;
2366
2367 if (!security_module_enable(&smack_ops))
2368 return 0;
2369
2370 err = smk_init_sysfs();
2371 if (err)
2372 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
2373
2374 err = register_filesystem(&smk_fs_type);
2375 if (!err) {
2376 smackfs_mount = kern_mount(&smk_fs_type);
2377 if (IS_ERR(smackfs_mount)) {
2378 printk(KERN_ERR "smackfs: could not mount!\n");
2379 err = PTR_ERR(smackfs_mount);
2380 smackfs_mount = NULL;
2381 }
2382 }
2383
2384 smk_cipso_doi();
2385 smk_unlbl_ambient(NULL);
2386
2387 rc = smk_preset_netlabel(&smack_known_floor);
2388 if (err == 0 && rc < 0)
2389 err = rc;
2390 rc = smk_preset_netlabel(&smack_known_hat);
2391 if (err == 0 && rc < 0)
2392 err = rc;
2393 rc = smk_preset_netlabel(&smack_known_huh);
2394 if (err == 0 && rc < 0)
2395 err = rc;
2396 rc = smk_preset_netlabel(&smack_known_invalid);
2397 if (err == 0 && rc < 0)
2398 err = rc;
2399 rc = smk_preset_netlabel(&smack_known_star);
2400 if (err == 0 && rc < 0)
2401 err = rc;
2402 rc = smk_preset_netlabel(&smack_known_web);
2403 if (err == 0 && rc < 0)
2404 err = rc;
2405
2406 return err;
2407}
2408
2409__initcall(init_smk_fs);