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