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