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