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