Loading...
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/*
2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, version 2.
7 *
8 * Authors:
9 * Casey Schaufler <casey@schaufler-ca.com>
10 * Ahmed S. Darwish <darwish.07@gmail.com>
11 *
12 * Special thanks to the authors of selinuxfs.
13 *
14 * Karl MacMillan <kmacmillan@tresys.com>
15 * James Morris <jmorris@redhat.com>
16 *
17 */
18
19#include <linux/kernel.h>
20#include <linux/vmalloc.h>
21#include <linux/security.h>
22#include <linux/mutex.h>
23#include <linux/slab.h>
24#include <net/net_namespace.h>
25#include <net/cipso_ipv4.h>
26#include <linux/seq_file.h>
27#include <linux/ctype.h>
28#include <linux/audit.h>
29#include <linux/magic.h>
30#include "smack.h"
31
32#define BEBITS (sizeof(__be32) * 8)
33/*
34 * smackfs pseudo filesystem.
35 */
36
37enum smk_inos {
38 SMK_ROOT_INO = 2,
39 SMK_LOAD = 3, /* load policy */
40 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
41 SMK_DOI = 5, /* CIPSO DOI */
42 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
43 SMK_AMBIENT = 7, /* internet ambient label */
44 SMK_NET4ADDR = 8, /* single label hosts */
45 SMK_ONLYCAP = 9, /* the only "capable" label */
46 SMK_LOGGING = 10, /* logging */
47 SMK_LOAD_SELF = 11, /* task specific rules */
48 SMK_ACCESSES = 12, /* access policy */
49 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
50 SMK_LOAD2 = 14, /* load policy with long labels */
51 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
52 SMK_ACCESS2 = 16, /* make an access check with long labels */
53 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
54 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
55 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
56 SMK_SYSLOG = 20, /* change syslog label) */
57 SMK_PTRACE = 21, /* set ptrace rule */
58#ifdef CONFIG_SECURITY_SMACK_BRINGUP
59 SMK_UNCONFINED = 22, /* define an unconfined label */
60#endif
61#if IS_ENABLED(CONFIG_IPV6)
62 SMK_NET6ADDR = 23, /* single label IPv6 hosts */
63#endif /* CONFIG_IPV6 */
64 SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
65};
66
67/*
68 * List locks
69 */
70static DEFINE_MUTEX(smack_cipso_lock);
71static DEFINE_MUTEX(smack_ambient_lock);
72static DEFINE_MUTEX(smk_net4addr_lock);
73#if IS_ENABLED(CONFIG_IPV6)
74static DEFINE_MUTEX(smk_net6addr_lock);
75#endif /* CONFIG_IPV6 */
76
77/*
78 * This is the "ambient" label for network traffic.
79 * If it isn't somehow marked, use this.
80 * It can be reset via smackfs/ambient
81 */
82struct smack_known *smack_net_ambient;
83
84/*
85 * This is the level in a CIPSO header that indicates a
86 * smack label is contained directly in the category set.
87 * It can be reset via smackfs/direct
88 */
89int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
90
91/*
92 * This is the level in a CIPSO header that indicates a
93 * secid is contained directly in the category set.
94 * It can be reset via smackfs/mapped
95 */
96int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
97
98#ifdef CONFIG_SECURITY_SMACK_BRINGUP
99/*
100 * Allow one label to be unconfined. This is for
101 * debugging and application bring-up purposes only.
102 * It is bad and wrong, but everyone seems to expect
103 * to have it.
104 */
105struct smack_known *smack_unconfined;
106#endif
107
108/*
109 * If this value is set restrict syslog use to the label specified.
110 * It can be reset via smackfs/syslog
111 */
112struct smack_known *smack_syslog_label;
113
114/*
115 * Ptrace current rule
116 * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
117 * SMACK_PTRACE_EXACT labels must match, but can be overriden with
118 * CAP_SYS_PTRACE
119 * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect
120 */
121int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
122
123/*
124 * Certain IP addresses may be designated as single label hosts.
125 * Packets are sent there unlabeled, but only from tasks that
126 * can write to the specified label.
127 */
128
129LIST_HEAD(smk_net4addr_list);
130#if IS_ENABLED(CONFIG_IPV6)
131LIST_HEAD(smk_net6addr_list);
132#endif /* CONFIG_IPV6 */
133
134/*
135 * Rule lists are maintained for each label.
136 * This master list is just for reading /smack/load and /smack/load2.
137 */
138struct smack_master_list {
139 struct list_head list;
140 struct smack_rule *smk_rule;
141};
142
143static LIST_HEAD(smack_rule_list);
144
145struct smack_parsed_rule {
146 struct smack_known *smk_subject;
147 struct smack_known *smk_object;
148 int smk_access1;
149 int smk_access2;
150};
151
152static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
153
154/*
155 * Values for parsing cipso rules
156 * SMK_DIGITLEN: Length of a digit field in a rule.
157 * SMK_CIPSOMIN: Minimum possible cipso rule length.
158 * SMK_CIPSOMAX: Maximum possible cipso rule length.
159 */
160#define SMK_DIGITLEN 4
161#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
162#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
163
164/*
165 * Values for parsing MAC rules
166 * SMK_ACCESS: Maximum possible combination of access permissions
167 * SMK_ACCESSLEN: Maximum length for a rule access field
168 * SMK_LOADLEN: Smack rule length
169 */
170#define SMK_OACCESS "rwxa"
171#define SMK_ACCESS "rwxatl"
172#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
173#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
174#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
175#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
176
177/*
178 * Stricly for CIPSO level manipulation.
179 * Set the category bit number in a smack label sized buffer.
180 */
181static inline void smack_catset_bit(unsigned int cat, char *catsetp)
182{
183 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
184 return;
185
186 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
187}
188
189/**
190 * smk_netlabel_audit_set - fill a netlbl_audit struct
191 * @nap: structure to fill
192 */
193static void smk_netlabel_audit_set(struct netlbl_audit *nap)
194{
195 struct smack_known *skp = smk_of_current();
196
197 nap->loginuid = audit_get_loginuid(current);
198 nap->sessionid = audit_get_sessionid(current);
199 nap->secid = skp->smk_secid;
200}
201
202/*
203 * Value for parsing single label host rules
204 * "1.2.3.4 X"
205 */
206#define SMK_NETLBLADDRMIN 9
207
208/**
209 * smk_set_access - add a rule to the rule list or replace an old rule
210 * @srp: the rule to add or replace
211 * @rule_list: the list of rules
212 * @rule_lock: the rule list lock
213 * @global: if non-zero, indicates a global rule
214 *
215 * Looks through the current subject/object/access list for
216 * the subject/object pair and replaces the access that was
217 * there. If the pair isn't found add it with the specified
218 * access.
219 *
220 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
221 * during the allocation of the new pair to add.
222 */
223static int smk_set_access(struct smack_parsed_rule *srp,
224 struct list_head *rule_list,
225 struct mutex *rule_lock, int global)
226{
227 struct smack_rule *sp;
228 struct smack_master_list *smlp;
229 int found = 0;
230 int rc = 0;
231
232 mutex_lock(rule_lock);
233
234 /*
235 * Because the object label is less likely to match
236 * than the subject label check it first
237 */
238 list_for_each_entry_rcu(sp, rule_list, list) {
239 if (sp->smk_object == srp->smk_object &&
240 sp->smk_subject == srp->smk_subject) {
241 found = 1;
242 sp->smk_access |= srp->smk_access1;
243 sp->smk_access &= ~srp->smk_access2;
244 break;
245 }
246 }
247
248 if (found == 0) {
249 sp = kzalloc(sizeof(*sp), GFP_KERNEL);
250 if (sp == NULL) {
251 rc = -ENOMEM;
252 goto out;
253 }
254
255 sp->smk_subject = srp->smk_subject;
256 sp->smk_object = srp->smk_object;
257 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
258
259 list_add_rcu(&sp->list, rule_list);
260 /*
261 * If this is a global as opposed to self and a new rule
262 * it needs to get added for reporting.
263 */
264 if (global) {
265 smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
266 if (smlp != NULL) {
267 smlp->smk_rule = sp;
268 list_add_rcu(&smlp->list, &smack_rule_list);
269 } else
270 rc = -ENOMEM;
271 }
272 }
273
274out:
275 mutex_unlock(rule_lock);
276 return rc;
277}
278
279/**
280 * smk_perm_from_str - parse smack accesses from a text string
281 * @string: a text string that contains a Smack accesses code
282 *
283 * Returns an integer with respective bits set for specified accesses.
284 */
285static int smk_perm_from_str(const char *string)
286{
287 int perm = 0;
288 const char *cp;
289
290 for (cp = string; ; cp++)
291 switch (*cp) {
292 case '-':
293 break;
294 case 'r':
295 case 'R':
296 perm |= MAY_READ;
297 break;
298 case 'w':
299 case 'W':
300 perm |= MAY_WRITE;
301 break;
302 case 'x':
303 case 'X':
304 perm |= MAY_EXEC;
305 break;
306 case 'a':
307 case 'A':
308 perm |= MAY_APPEND;
309 break;
310 case 't':
311 case 'T':
312 perm |= MAY_TRANSMUTE;
313 break;
314 case 'l':
315 case 'L':
316 perm |= MAY_LOCK;
317 break;
318 case 'b':
319 case 'B':
320 perm |= MAY_BRINGUP;
321 break;
322 default:
323 return perm;
324 }
325}
326
327/**
328 * smk_fill_rule - Fill Smack rule from strings
329 * @subject: subject label string
330 * @object: object label string
331 * @access1: access string
332 * @access2: string with permissions to be removed
333 * @rule: Smack rule
334 * @import: if non-zero, import labels
335 * @len: label length limit
336 *
337 * Returns 0 on success, appropriate error code on failure.
338 */
339static int smk_fill_rule(const char *subject, const char *object,
340 const char *access1, const char *access2,
341 struct smack_parsed_rule *rule, int import,
342 int len)
343{
344 const char *cp;
345 struct smack_known *skp;
346
347 if (import) {
348 rule->smk_subject = smk_import_entry(subject, len);
349 if (IS_ERR(rule->smk_subject))
350 return PTR_ERR(rule->smk_subject);
351
352 rule->smk_object = smk_import_entry(object, len);
353 if (IS_ERR(rule->smk_object))
354 return PTR_ERR(rule->smk_object);
355 } else {
356 cp = smk_parse_smack(subject, len);
357 if (IS_ERR(cp))
358 return PTR_ERR(cp);
359 skp = smk_find_entry(cp);
360 kfree(cp);
361 if (skp == NULL)
362 return -ENOENT;
363 rule->smk_subject = skp;
364
365 cp = smk_parse_smack(object, len);
366 if (IS_ERR(cp))
367 return PTR_ERR(cp);
368 skp = smk_find_entry(cp);
369 kfree(cp);
370 if (skp == NULL)
371 return -ENOENT;
372 rule->smk_object = skp;
373 }
374
375 rule->smk_access1 = smk_perm_from_str(access1);
376 if (access2)
377 rule->smk_access2 = smk_perm_from_str(access2);
378 else
379 rule->smk_access2 = ~rule->smk_access1;
380
381 return 0;
382}
383
384/**
385 * smk_parse_rule - parse Smack rule from load string
386 * @data: string to be parsed whose size is SMK_LOADLEN
387 * @rule: Smack rule
388 * @import: if non-zero, import labels
389 *
390 * Returns 0 on success, -1 on errors.
391 */
392static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
393 int import)
394{
395 int rc;
396
397 rc = smk_fill_rule(data, data + SMK_LABELLEN,
398 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
399 import, SMK_LABELLEN);
400 return rc;
401}
402
403/**
404 * smk_parse_long_rule - parse Smack rule from rule string
405 * @data: string to be parsed, null terminated
406 * @rule: Will be filled with Smack parsed rule
407 * @import: if non-zero, import labels
408 * @tokens: numer of substrings expected in data
409 *
410 * Returns number of processed bytes on success, -ERRNO on failure.
411 */
412static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
413 int import, int tokens)
414{
415 ssize_t cnt = 0;
416 char *tok[4];
417 int rc;
418 int i;
419
420 /*
421 * Parsing the rule in-place, filling all white-spaces with '\0'
422 */
423 for (i = 0; i < tokens; ++i) {
424 while (isspace(data[cnt]))
425 data[cnt++] = '\0';
426
427 if (data[cnt] == '\0')
428 /* Unexpected end of data */
429 return -EINVAL;
430
431 tok[i] = data + cnt;
432
433 while (data[cnt] && !isspace(data[cnt]))
434 ++cnt;
435 }
436 while (isspace(data[cnt]))
437 data[cnt++] = '\0';
438
439 while (i < 4)
440 tok[i++] = NULL;
441
442 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
443 return rc == 0 ? cnt : rc;
444}
445
446#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
447#define SMK_LONG_FMT 1 /* Variable long label format */
448#define SMK_CHANGE_FMT 2 /* Rule modification format */
449/**
450 * smk_write_rules_list - write() for any /smack rule file
451 * @file: file pointer, not actually used
452 * @buf: where to get the data from
453 * @count: bytes sent
454 * @ppos: where to start - must be 0
455 * @rule_list: the list of rules to write to
456 * @rule_lock: lock for the rule list
457 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
458 *
459 * Get one smack access rule from above.
460 * The format for SMK_LONG_FMT is:
461 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
462 * The format for SMK_FIXED24_FMT is exactly:
463 * "subject object rwxat"
464 * The format for SMK_CHANGE_FMT is:
465 * "subject<whitespace>object<whitespace>
466 * acc_enable<whitespace>acc_disable[<whitespace>...]"
467 */
468static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
469 size_t count, loff_t *ppos,
470 struct list_head *rule_list,
471 struct mutex *rule_lock, int format)
472{
473 struct smack_parsed_rule rule;
474 char *data;
475 int rc;
476 int trunc = 0;
477 int tokens;
478 ssize_t cnt = 0;
479
480 /*
481 * No partial writes.
482 * Enough data must be present.
483 */
484 if (*ppos != 0)
485 return -EINVAL;
486
487 if (format == SMK_FIXED24_FMT) {
488 /*
489 * Minor hack for backward compatibility
490 */
491 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
492 return -EINVAL;
493 } else {
494 if (count >= PAGE_SIZE) {
495 count = PAGE_SIZE - 1;
496 trunc = 1;
497 }
498 }
499
500 data = memdup_user_nul(buf, count);
501 if (IS_ERR(data))
502 return PTR_ERR(data);
503
504 /*
505 * In case of parsing only part of user buf,
506 * avoid having partial rule at the data buffer
507 */
508 if (trunc) {
509 while (count > 0 && (data[count - 1] != '\n'))
510 --count;
511 if (count == 0) {
512 rc = -EINVAL;
513 goto out;
514 }
515 }
516
517 data[count] = '\0';
518 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
519 while (cnt < count) {
520 if (format == SMK_FIXED24_FMT) {
521 rc = smk_parse_rule(data, &rule, 1);
522 if (rc < 0)
523 goto out;
524 cnt = count;
525 } else {
526 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
527 if (rc < 0)
528 goto out;
529 if (rc == 0) {
530 rc = -EINVAL;
531 goto out;
532 }
533 cnt += rc;
534 }
535
536 if (rule_list == NULL)
537 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
538 &rule.smk_subject->smk_rules_lock, 1);
539 else
540 rc = smk_set_access(&rule, rule_list, rule_lock, 0);
541
542 if (rc)
543 goto out;
544 }
545
546 rc = cnt;
547out:
548 kfree(data);
549 return rc;
550}
551
552/*
553 * Core logic for smackfs seq list operations.
554 */
555
556static void *smk_seq_start(struct seq_file *s, loff_t *pos,
557 struct list_head *head)
558{
559 struct list_head *list;
560 int i = *pos;
561
562 rcu_read_lock();
563 for (list = rcu_dereference(list_next_rcu(head));
564 list != head;
565 list = rcu_dereference(list_next_rcu(list))) {
566 if (i-- == 0)
567 return list;
568 }
569
570 return NULL;
571}
572
573static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
574 struct list_head *head)
575{
576 struct list_head *list = v;
577
578 ++*pos;
579 list = rcu_dereference(list_next_rcu(list));
580
581 return (list == head) ? NULL : list;
582}
583
584static void smk_seq_stop(struct seq_file *s, void *v)
585{
586 rcu_read_unlock();
587}
588
589static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
590{
591 /*
592 * Don't show any rules with label names too long for
593 * interface file (/smack/load or /smack/load2)
594 * because you should expect to be able to write
595 * anything you read back.
596 */
597 if (strlen(srp->smk_subject->smk_known) >= max ||
598 strlen(srp->smk_object->smk_known) >= max)
599 return;
600
601 if (srp->smk_access == 0)
602 return;
603
604 seq_printf(s, "%s %s",
605 srp->smk_subject->smk_known,
606 srp->smk_object->smk_known);
607
608 seq_putc(s, ' ');
609
610 if (srp->smk_access & MAY_READ)
611 seq_putc(s, 'r');
612 if (srp->smk_access & MAY_WRITE)
613 seq_putc(s, 'w');
614 if (srp->smk_access & MAY_EXEC)
615 seq_putc(s, 'x');
616 if (srp->smk_access & MAY_APPEND)
617 seq_putc(s, 'a');
618 if (srp->smk_access & MAY_TRANSMUTE)
619 seq_putc(s, 't');
620 if (srp->smk_access & MAY_LOCK)
621 seq_putc(s, 'l');
622 if (srp->smk_access & MAY_BRINGUP)
623 seq_putc(s, 'b');
624
625 seq_putc(s, '\n');
626}
627
628/*
629 * Seq_file read operations for /smack/load
630 */
631
632static void *load2_seq_start(struct seq_file *s, loff_t *pos)
633{
634 return smk_seq_start(s, pos, &smack_rule_list);
635}
636
637static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
638{
639 return smk_seq_next(s, v, pos, &smack_rule_list);
640}
641
642static int load_seq_show(struct seq_file *s, void *v)
643{
644 struct list_head *list = v;
645 struct smack_master_list *smlp =
646 list_entry_rcu(list, struct smack_master_list, list);
647
648 smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);
649
650 return 0;
651}
652
653static const struct seq_operations load_seq_ops = {
654 .start = load2_seq_start,
655 .next = load2_seq_next,
656 .show = load_seq_show,
657 .stop = smk_seq_stop,
658};
659
660/**
661 * smk_open_load - open() for /smack/load
662 * @inode: inode structure representing file
663 * @file: "load" file pointer
664 *
665 * For reading, use load_seq_* seq_file reading operations.
666 */
667static int smk_open_load(struct inode *inode, struct file *file)
668{
669 return seq_open(file, &load_seq_ops);
670}
671
672/**
673 * smk_write_load - write() for /smack/load
674 * @file: file pointer, not actually used
675 * @buf: where to get the data from
676 * @count: bytes sent
677 * @ppos: where to start - must be 0
678 *
679 */
680static ssize_t smk_write_load(struct file *file, const char __user *buf,
681 size_t count, loff_t *ppos)
682{
683 /*
684 * Must have privilege.
685 * No partial writes.
686 * Enough data must be present.
687 */
688 if (!smack_privileged(CAP_MAC_ADMIN))
689 return -EPERM;
690
691 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
692 SMK_FIXED24_FMT);
693}
694
695static const struct file_operations smk_load_ops = {
696 .open = smk_open_load,
697 .read = seq_read,
698 .llseek = seq_lseek,
699 .write = smk_write_load,
700 .release = seq_release,
701};
702
703/**
704 * smk_cipso_doi - initialize the CIPSO domain
705 */
706static void smk_cipso_doi(void)
707{
708 int rc;
709 struct cipso_v4_doi *doip;
710 struct netlbl_audit nai;
711
712 smk_netlabel_audit_set(&nai);
713
714 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
715 if (rc != 0)
716 printk(KERN_WARNING "%s:%d remove rc = %d\n",
717 __func__, __LINE__, rc);
718
719 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
720 if (doip == NULL)
721 panic("smack: Failed to initialize cipso DOI.\n");
722 doip->map.std = NULL;
723 doip->doi = smk_cipso_doi_value;
724 doip->type = CIPSO_V4_MAP_PASS;
725 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
726 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
727 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
728
729 rc = netlbl_cfg_cipsov4_add(doip, &nai);
730 if (rc != 0) {
731 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
732 __func__, __LINE__, rc);
733 kfree(doip);
734 return;
735 }
736 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
737 if (rc != 0) {
738 printk(KERN_WARNING "%s:%d map add rc = %d\n",
739 __func__, __LINE__, rc);
740 kfree(doip);
741 return;
742 }
743}
744
745/**
746 * smk_unlbl_ambient - initialize the unlabeled domain
747 * @oldambient: previous domain string
748 */
749static void smk_unlbl_ambient(char *oldambient)
750{
751 int rc;
752 struct netlbl_audit nai;
753
754 smk_netlabel_audit_set(&nai);
755
756 if (oldambient != NULL) {
757 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
758 if (rc != 0)
759 printk(KERN_WARNING "%s:%d remove rc = %d\n",
760 __func__, __LINE__, rc);
761 }
762 if (smack_net_ambient == NULL)
763 smack_net_ambient = &smack_known_floor;
764
765 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
766 NULL, NULL, &nai);
767 if (rc != 0)
768 printk(KERN_WARNING "%s:%d add rc = %d\n",
769 __func__, __LINE__, rc);
770}
771
772/*
773 * Seq_file read operations for /smack/cipso
774 */
775
776static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
777{
778 return smk_seq_start(s, pos, &smack_known_list);
779}
780
781static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
782{
783 return smk_seq_next(s, v, pos, &smack_known_list);
784}
785
786/*
787 * Print cipso labels in format:
788 * label level[/cat[,cat]]
789 */
790static int cipso_seq_show(struct seq_file *s, void *v)
791{
792 struct list_head *list = v;
793 struct smack_known *skp =
794 list_entry_rcu(list, struct smack_known, list);
795 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
796 char sep = '/';
797 int i;
798
799 /*
800 * Don't show a label that could not have been set using
801 * /smack/cipso. This is in support of the notion that
802 * anything read from /smack/cipso ought to be writeable
803 * to /smack/cipso.
804 *
805 * /smack/cipso2 should be used instead.
806 */
807 if (strlen(skp->smk_known) >= SMK_LABELLEN)
808 return 0;
809
810 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
811
812 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
813 i = netlbl_catmap_walk(cmp, i + 1)) {
814 seq_printf(s, "%c%d", sep, i);
815 sep = ',';
816 }
817
818 seq_putc(s, '\n');
819
820 return 0;
821}
822
823static const struct seq_operations cipso_seq_ops = {
824 .start = cipso_seq_start,
825 .next = cipso_seq_next,
826 .show = cipso_seq_show,
827 .stop = smk_seq_stop,
828};
829
830/**
831 * smk_open_cipso - open() for /smack/cipso
832 * @inode: inode structure representing file
833 * @file: "cipso" file pointer
834 *
835 * Connect our cipso_seq_* operations with /smack/cipso
836 * file_operations
837 */
838static int smk_open_cipso(struct inode *inode, struct file *file)
839{
840 return seq_open(file, &cipso_seq_ops);
841}
842
843/**
844 * smk_set_cipso - do the work for write() for cipso and cipso2
845 * @file: file pointer, not actually used
846 * @buf: where to get the data from
847 * @count: bytes sent
848 * @ppos: where to start
849 * @format: /smack/cipso or /smack/cipso2
850 *
851 * Accepts only one cipso rule per write call.
852 * Returns number of bytes written or error code, as appropriate
853 */
854static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
855 size_t count, loff_t *ppos, int format)
856{
857 struct smack_known *skp;
858 struct netlbl_lsm_secattr ncats;
859 char mapcatset[SMK_CIPSOLEN];
860 int maplevel;
861 unsigned int cat;
862 int catlen;
863 ssize_t rc = -EINVAL;
864 char *data = NULL;
865 char *rule;
866 int ret;
867 int i;
868
869 /*
870 * Must have privilege.
871 * No partial writes.
872 * Enough data must be present.
873 */
874 if (!smack_privileged(CAP_MAC_ADMIN))
875 return -EPERM;
876 if (*ppos != 0)
877 return -EINVAL;
878 if (format == SMK_FIXED24_FMT &&
879 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
880 return -EINVAL;
881
882 data = memdup_user_nul(buf, count);
883 if (IS_ERR(data))
884 return PTR_ERR(data);
885
886 rule = data;
887 /*
888 * Only allow one writer at a time. Writes should be
889 * quite rare and small in any case.
890 */
891 mutex_lock(&smack_cipso_lock);
892
893 skp = smk_import_entry(rule, 0);
894 if (IS_ERR(skp)) {
895 rc = PTR_ERR(skp);
896 goto out;
897 }
898
899 if (format == SMK_FIXED24_FMT)
900 rule += SMK_LABELLEN;
901 else
902 rule += strlen(skp->smk_known) + 1;
903
904 ret = sscanf(rule, "%d", &maplevel);
905 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
906 goto out;
907
908 rule += SMK_DIGITLEN;
909 ret = sscanf(rule, "%d", &catlen);
910 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
911 goto out;
912
913 if (format == SMK_FIXED24_FMT &&
914 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
915 goto out;
916
917 memset(mapcatset, 0, sizeof(mapcatset));
918
919 for (i = 0; i < catlen; i++) {
920 rule += SMK_DIGITLEN;
921 ret = sscanf(rule, "%u", &cat);
922 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
923 goto out;
924
925 smack_catset_bit(cat, mapcatset);
926 }
927
928 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
929 if (rc >= 0) {
930 netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat);
931 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
932 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
933 rc = count;
934 }
935
936out:
937 mutex_unlock(&smack_cipso_lock);
938 kfree(data);
939 return rc;
940}
941
942/**
943 * smk_write_cipso - write() for /smack/cipso
944 * @file: file pointer, not actually used
945 * @buf: where to get the data from
946 * @count: bytes sent
947 * @ppos: where to start
948 *
949 * Accepts only one cipso rule per write call.
950 * Returns number of bytes written or error code, as appropriate
951 */
952static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
953 size_t count, loff_t *ppos)
954{
955 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
956}
957
958static const struct file_operations smk_cipso_ops = {
959 .open = smk_open_cipso,
960 .read = seq_read,
961 .llseek = seq_lseek,
962 .write = smk_write_cipso,
963 .release = seq_release,
964};
965
966/*
967 * Seq_file read operations for /smack/cipso2
968 */
969
970/*
971 * Print cipso labels in format:
972 * label level[/cat[,cat]]
973 */
974static int cipso2_seq_show(struct seq_file *s, void *v)
975{
976 struct list_head *list = v;
977 struct smack_known *skp =
978 list_entry_rcu(list, struct smack_known, list);
979 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
980 char sep = '/';
981 int i;
982
983 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
984
985 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
986 i = netlbl_catmap_walk(cmp, i + 1)) {
987 seq_printf(s, "%c%d", sep, i);
988 sep = ',';
989 }
990
991 seq_putc(s, '\n');
992
993 return 0;
994}
995
996static const struct seq_operations cipso2_seq_ops = {
997 .start = cipso_seq_start,
998 .next = cipso_seq_next,
999 .show = cipso2_seq_show,
1000 .stop = smk_seq_stop,
1001};
1002
1003/**
1004 * smk_open_cipso2 - open() for /smack/cipso2
1005 * @inode: inode structure representing file
1006 * @file: "cipso2" file pointer
1007 *
1008 * Connect our cipso_seq_* operations with /smack/cipso2
1009 * file_operations
1010 */
1011static int smk_open_cipso2(struct inode *inode, struct file *file)
1012{
1013 return seq_open(file, &cipso2_seq_ops);
1014}
1015
1016/**
1017 * smk_write_cipso2 - write() for /smack/cipso2
1018 * @file: file pointer, not actually used
1019 * @buf: where to get the data from
1020 * @count: bytes sent
1021 * @ppos: where to start
1022 *
1023 * Accepts only one cipso rule per write call.
1024 * Returns number of bytes written or error code, as appropriate
1025 */
1026static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1027 size_t count, loff_t *ppos)
1028{
1029 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1030}
1031
1032static const struct file_operations smk_cipso2_ops = {
1033 .open = smk_open_cipso2,
1034 .read = seq_read,
1035 .llseek = seq_lseek,
1036 .write = smk_write_cipso2,
1037 .release = seq_release,
1038};
1039
1040/*
1041 * Seq_file read operations for /smack/netlabel
1042 */
1043
1044static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1045{
1046 return smk_seq_start(s, pos, &smk_net4addr_list);
1047}
1048
1049static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1050{
1051 return smk_seq_next(s, v, pos, &smk_net4addr_list);
1052}
1053
1054/*
1055 * Print host/label pairs
1056 */
1057static int net4addr_seq_show(struct seq_file *s, void *v)
1058{
1059 struct list_head *list = v;
1060 struct smk_net4addr *skp =
1061 list_entry_rcu(list, struct smk_net4addr, list);
1062 char *kp = SMACK_CIPSO_OPTION;
1063
1064 if (skp->smk_label != NULL)
1065 kp = skp->smk_label->smk_known;
1066 seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1067 skp->smk_masks, kp);
1068
1069 return 0;
1070}
1071
1072static const struct seq_operations net4addr_seq_ops = {
1073 .start = net4addr_seq_start,
1074 .next = net4addr_seq_next,
1075 .show = net4addr_seq_show,
1076 .stop = smk_seq_stop,
1077};
1078
1079/**
1080 * smk_open_net4addr - open() for /smack/netlabel
1081 * @inode: inode structure representing file
1082 * @file: "netlabel" file pointer
1083 *
1084 * Connect our net4addr_seq_* operations with /smack/netlabel
1085 * file_operations
1086 */
1087static int smk_open_net4addr(struct inode *inode, struct file *file)
1088{
1089 return seq_open(file, &net4addr_seq_ops);
1090}
1091
1092/**
1093 * smk_net4addr_insert
1094 * @new : netlabel to insert
1095 *
1096 * This helper insert netlabel in the smack_net4addrs list
1097 * sorted by netmask length (longest to smallest)
1098 * locked by &smk_net4addr_lock in smk_write_net4addr
1099 *
1100 */
1101static void smk_net4addr_insert(struct smk_net4addr *new)
1102{
1103 struct smk_net4addr *m;
1104 struct smk_net4addr *m_next;
1105
1106 if (list_empty(&smk_net4addr_list)) {
1107 list_add_rcu(&new->list, &smk_net4addr_list);
1108 return;
1109 }
1110
1111 m = list_entry_rcu(smk_net4addr_list.next,
1112 struct smk_net4addr, list);
1113
1114 /* the comparison '>' is a bit hacky, but works */
1115 if (new->smk_masks > m->smk_masks) {
1116 list_add_rcu(&new->list, &smk_net4addr_list);
1117 return;
1118 }
1119
1120 list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1121 if (list_is_last(&m->list, &smk_net4addr_list)) {
1122 list_add_rcu(&new->list, &m->list);
1123 return;
1124 }
1125 m_next = list_entry_rcu(m->list.next,
1126 struct smk_net4addr, list);
1127 if (new->smk_masks > m_next->smk_masks) {
1128 list_add_rcu(&new->list, &m->list);
1129 return;
1130 }
1131 }
1132}
1133
1134
1135/**
1136 * smk_write_net4addr - write() for /smack/netlabel
1137 * @file: file pointer, not actually used
1138 * @buf: where to get the data from
1139 * @count: bytes sent
1140 * @ppos: where to start
1141 *
1142 * Accepts only one net4addr per write call.
1143 * Returns number of bytes written or error code, as appropriate
1144 */
1145static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1146 size_t count, loff_t *ppos)
1147{
1148 struct smk_net4addr *snp;
1149 struct sockaddr_in newname;
1150 char *smack;
1151 struct smack_known *skp = NULL;
1152 char *data;
1153 char *host = (char *)&newname.sin_addr.s_addr;
1154 int rc;
1155 struct netlbl_audit audit_info;
1156 struct in_addr mask;
1157 unsigned int m;
1158 unsigned int masks;
1159 int found;
1160 u32 mask_bits = (1<<31);
1161 __be32 nsa;
1162 u32 temp_mask;
1163
1164 /*
1165 * Must have privilege.
1166 * No partial writes.
1167 * Enough data must be present.
1168 * "<addr/mask, as a.b.c.d/e><space><label>"
1169 * "<addr, as a.b.c.d><space><label>"
1170 */
1171 if (!smack_privileged(CAP_MAC_ADMIN))
1172 return -EPERM;
1173 if (*ppos != 0)
1174 return -EINVAL;
1175 if (count < SMK_NETLBLADDRMIN)
1176 return -EINVAL;
1177
1178 data = memdup_user_nul(buf, count);
1179 if (IS_ERR(data))
1180 return PTR_ERR(data);
1181
1182 smack = kzalloc(count + 1, GFP_KERNEL);
1183 if (smack == NULL) {
1184 rc = -ENOMEM;
1185 goto free_data_out;
1186 }
1187
1188 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1189 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1190 if (rc != 6) {
1191 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1192 &host[0], &host[1], &host[2], &host[3], smack);
1193 if (rc != 5) {
1194 rc = -EINVAL;
1195 goto free_out;
1196 }
1197 m = BEBITS;
1198 masks = 32;
1199 }
1200 if (masks > BEBITS) {
1201 rc = -EINVAL;
1202 goto free_out;
1203 }
1204
1205 /*
1206 * If smack begins with '-', it is an option, don't import it
1207 */
1208 if (smack[0] != '-') {
1209 skp = smk_import_entry(smack, 0);
1210 if (IS_ERR(skp)) {
1211 rc = PTR_ERR(skp);
1212 goto free_out;
1213 }
1214 } else {
1215 /*
1216 * Only the -CIPSO option is supported for IPv4
1217 */
1218 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1219 rc = -EINVAL;
1220 goto free_out;
1221 }
1222 }
1223
1224 for (m = masks, temp_mask = 0; m > 0; m--) {
1225 temp_mask |= mask_bits;
1226 mask_bits >>= 1;
1227 }
1228 mask.s_addr = cpu_to_be32(temp_mask);
1229
1230 newname.sin_addr.s_addr &= mask.s_addr;
1231 /*
1232 * Only allow one writer at a time. Writes should be
1233 * quite rare and small in any case.
1234 */
1235 mutex_lock(&smk_net4addr_lock);
1236
1237 nsa = newname.sin_addr.s_addr;
1238 /* try to find if the prefix is already in the list */
1239 found = 0;
1240 list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1241 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1242 found = 1;
1243 break;
1244 }
1245 }
1246 smk_netlabel_audit_set(&audit_info);
1247
1248 if (found == 0) {
1249 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1250 if (snp == NULL)
1251 rc = -ENOMEM;
1252 else {
1253 rc = 0;
1254 snp->smk_host.s_addr = newname.sin_addr.s_addr;
1255 snp->smk_mask.s_addr = mask.s_addr;
1256 snp->smk_label = skp;
1257 snp->smk_masks = masks;
1258 smk_net4addr_insert(snp);
1259 }
1260 } else {
1261 /*
1262 * Delete the unlabeled entry, only if the previous label
1263 * wasn't the special CIPSO option
1264 */
1265 if (snp->smk_label != NULL)
1266 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1267 &snp->smk_host, &snp->smk_mask,
1268 PF_INET, &audit_info);
1269 else
1270 rc = 0;
1271 snp->smk_label = skp;
1272 }
1273
1274 /*
1275 * Now tell netlabel about the single label nature of
1276 * this host so that incoming packets get labeled.
1277 * but only if we didn't get the special CIPSO option
1278 */
1279 if (rc == 0 && skp != NULL)
1280 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1281 &snp->smk_host, &snp->smk_mask, PF_INET,
1282 snp->smk_label->smk_secid, &audit_info);
1283
1284 if (rc == 0)
1285 rc = count;
1286
1287 mutex_unlock(&smk_net4addr_lock);
1288
1289free_out:
1290 kfree(smack);
1291free_data_out:
1292 kfree(data);
1293
1294 return rc;
1295}
1296
1297static const struct file_operations smk_net4addr_ops = {
1298 .open = smk_open_net4addr,
1299 .read = seq_read,
1300 .llseek = seq_lseek,
1301 .write = smk_write_net4addr,
1302 .release = seq_release,
1303};
1304
1305#if IS_ENABLED(CONFIG_IPV6)
1306/*
1307 * Seq_file read operations for /smack/netlabel6
1308 */
1309
1310static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1311{
1312 return smk_seq_start(s, pos, &smk_net6addr_list);
1313}
1314
1315static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1316{
1317 return smk_seq_next(s, v, pos, &smk_net6addr_list);
1318}
1319
1320/*
1321 * Print host/label pairs
1322 */
1323static int net6addr_seq_show(struct seq_file *s, void *v)
1324{
1325 struct list_head *list = v;
1326 struct smk_net6addr *skp =
1327 list_entry(list, struct smk_net6addr, list);
1328
1329 if (skp->smk_label != NULL)
1330 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1331 skp->smk_label->smk_known);
1332
1333 return 0;
1334}
1335
1336static const struct seq_operations net6addr_seq_ops = {
1337 .start = net6addr_seq_start,
1338 .next = net6addr_seq_next,
1339 .show = net6addr_seq_show,
1340 .stop = smk_seq_stop,
1341};
1342
1343/**
1344 * smk_open_net6addr - open() for /smack/netlabel
1345 * @inode: inode structure representing file
1346 * @file: "netlabel" file pointer
1347 *
1348 * Connect our net6addr_seq_* operations with /smack/netlabel
1349 * file_operations
1350 */
1351static int smk_open_net6addr(struct inode *inode, struct file *file)
1352{
1353 return seq_open(file, &net6addr_seq_ops);
1354}
1355
1356/**
1357 * smk_net6addr_insert
1358 * @new : entry to insert
1359 *
1360 * This inserts an entry in the smack_net6addrs list
1361 * sorted by netmask length (longest to smallest)
1362 * locked by &smk_net6addr_lock in smk_write_net6addr
1363 *
1364 */
1365static void smk_net6addr_insert(struct smk_net6addr *new)
1366{
1367 struct smk_net6addr *m_next;
1368 struct smk_net6addr *m;
1369
1370 if (list_empty(&smk_net6addr_list)) {
1371 list_add_rcu(&new->list, &smk_net6addr_list);
1372 return;
1373 }
1374
1375 m = list_entry_rcu(smk_net6addr_list.next,
1376 struct smk_net6addr, list);
1377
1378 if (new->smk_masks > m->smk_masks) {
1379 list_add_rcu(&new->list, &smk_net6addr_list);
1380 return;
1381 }
1382
1383 list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1384 if (list_is_last(&m->list, &smk_net6addr_list)) {
1385 list_add_rcu(&new->list, &m->list);
1386 return;
1387 }
1388 m_next = list_entry_rcu(m->list.next,
1389 struct smk_net6addr, list);
1390 if (new->smk_masks > m_next->smk_masks) {
1391 list_add_rcu(&new->list, &m->list);
1392 return;
1393 }
1394 }
1395}
1396
1397
1398/**
1399 * smk_write_net6addr - write() for /smack/netlabel
1400 * @file: file pointer, not actually used
1401 * @buf: where to get the data from
1402 * @count: bytes sent
1403 * @ppos: where to start
1404 *
1405 * Accepts only one net6addr per write call.
1406 * Returns number of bytes written or error code, as appropriate
1407 */
1408static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1409 size_t count, loff_t *ppos)
1410{
1411 struct smk_net6addr *snp;
1412 struct in6_addr newname;
1413 struct in6_addr fullmask;
1414 struct smack_known *skp = NULL;
1415 char *smack;
1416 char *data;
1417 int rc = 0;
1418 int found = 0;
1419 int i;
1420 unsigned int scanned[8];
1421 unsigned int m;
1422 unsigned int mask = 128;
1423
1424 /*
1425 * Must have privilege.
1426 * No partial writes.
1427 * Enough data must be present.
1428 * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1429 * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1430 */
1431 if (!smack_privileged(CAP_MAC_ADMIN))
1432 return -EPERM;
1433 if (*ppos != 0)
1434 return -EINVAL;
1435 if (count < SMK_NETLBLADDRMIN)
1436 return -EINVAL;
1437
1438 data = memdup_user_nul(buf, count);
1439 if (IS_ERR(data))
1440 return PTR_ERR(data);
1441
1442 smack = kzalloc(count + 1, GFP_KERNEL);
1443 if (smack == NULL) {
1444 rc = -ENOMEM;
1445 goto free_data_out;
1446 }
1447
1448 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1449 &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1450 &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1451 &mask, smack);
1452 if (i != 10) {
1453 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1454 &scanned[0], &scanned[1], &scanned[2],
1455 &scanned[3], &scanned[4], &scanned[5],
1456 &scanned[6], &scanned[7], smack);
1457 if (i != 9) {
1458 rc = -EINVAL;
1459 goto free_out;
1460 }
1461 }
1462 if (mask > 128) {
1463 rc = -EINVAL;
1464 goto free_out;
1465 }
1466 for (i = 0; i < 8; i++) {
1467 if (scanned[i] > 0xffff) {
1468 rc = -EINVAL;
1469 goto free_out;
1470 }
1471 newname.s6_addr16[i] = htons(scanned[i]);
1472 }
1473
1474 /*
1475 * If smack begins with '-', it is an option, don't import it
1476 */
1477 if (smack[0] != '-') {
1478 skp = smk_import_entry(smack, 0);
1479 if (IS_ERR(skp)) {
1480 rc = PTR_ERR(skp);
1481 goto free_out;
1482 }
1483 } else {
1484 /*
1485 * Only -DELETE is supported for IPv6
1486 */
1487 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1488 rc = -EINVAL;
1489 goto free_out;
1490 }
1491 }
1492
1493 for (i = 0, m = mask; i < 8; i++) {
1494 if (m >= 16) {
1495 fullmask.s6_addr16[i] = 0xffff;
1496 m -= 16;
1497 } else if (m > 0) {
1498 fullmask.s6_addr16[i] = (1 << m) - 1;
1499 m = 0;
1500 } else
1501 fullmask.s6_addr16[i] = 0;
1502 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1503 }
1504
1505 /*
1506 * Only allow one writer at a time. Writes should be
1507 * quite rare and small in any case.
1508 */
1509 mutex_lock(&smk_net6addr_lock);
1510 /*
1511 * Try to find the prefix in the list
1512 */
1513 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1514 if (mask != snp->smk_masks)
1515 continue;
1516 for (found = 1, i = 0; i < 8; i++) {
1517 if (newname.s6_addr16[i] !=
1518 snp->smk_host.s6_addr16[i]) {
1519 found = 0;
1520 break;
1521 }
1522 }
1523 if (found == 1)
1524 break;
1525 }
1526 if (found == 0) {
1527 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1528 if (snp == NULL)
1529 rc = -ENOMEM;
1530 else {
1531 snp->smk_host = newname;
1532 snp->smk_mask = fullmask;
1533 snp->smk_masks = mask;
1534 snp->smk_label = skp;
1535 smk_net6addr_insert(snp);
1536 }
1537 } else {
1538 snp->smk_label = skp;
1539 }
1540
1541 if (rc == 0)
1542 rc = count;
1543
1544 mutex_unlock(&smk_net6addr_lock);
1545
1546free_out:
1547 kfree(smack);
1548free_data_out:
1549 kfree(data);
1550
1551 return rc;
1552}
1553
1554static const struct file_operations smk_net6addr_ops = {
1555 .open = smk_open_net6addr,
1556 .read = seq_read,
1557 .llseek = seq_lseek,
1558 .write = smk_write_net6addr,
1559 .release = seq_release,
1560};
1561#endif /* CONFIG_IPV6 */
1562
1563/**
1564 * smk_read_doi - read() for /smack/doi
1565 * @filp: file pointer, not actually used
1566 * @buf: where to put the result
1567 * @count: maximum to send along
1568 * @ppos: where to start
1569 *
1570 * Returns number of bytes read or error code, as appropriate
1571 */
1572static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1573 size_t count, loff_t *ppos)
1574{
1575 char temp[80];
1576 ssize_t rc;
1577
1578 if (*ppos != 0)
1579 return 0;
1580
1581 sprintf(temp, "%d", smk_cipso_doi_value);
1582 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1583
1584 return rc;
1585}
1586
1587/**
1588 * smk_write_doi - write() for /smack/doi
1589 * @file: file pointer, not actually used
1590 * @buf: where to get the data from
1591 * @count: bytes sent
1592 * @ppos: where to start
1593 *
1594 * Returns number of bytes written or error code, as appropriate
1595 */
1596static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1597 size_t count, loff_t *ppos)
1598{
1599 char temp[80];
1600 int i;
1601
1602 if (!smack_privileged(CAP_MAC_ADMIN))
1603 return -EPERM;
1604
1605 if (count >= sizeof(temp) || count == 0)
1606 return -EINVAL;
1607
1608 if (copy_from_user(temp, buf, count) != 0)
1609 return -EFAULT;
1610
1611 temp[count] = '\0';
1612
1613 if (sscanf(temp, "%d", &i) != 1)
1614 return -EINVAL;
1615
1616 smk_cipso_doi_value = i;
1617
1618 smk_cipso_doi();
1619
1620 return count;
1621}
1622
1623static const struct file_operations smk_doi_ops = {
1624 .read = smk_read_doi,
1625 .write = smk_write_doi,
1626 .llseek = default_llseek,
1627};
1628
1629/**
1630 * smk_read_direct - read() for /smack/direct
1631 * @filp: file pointer, not actually used
1632 * @buf: where to put the result
1633 * @count: maximum to send along
1634 * @ppos: where to start
1635 *
1636 * Returns number of bytes read or error code, as appropriate
1637 */
1638static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1639 size_t count, loff_t *ppos)
1640{
1641 char temp[80];
1642 ssize_t rc;
1643
1644 if (*ppos != 0)
1645 return 0;
1646
1647 sprintf(temp, "%d", smack_cipso_direct);
1648 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1649
1650 return rc;
1651}
1652
1653/**
1654 * smk_write_direct - write() for /smack/direct
1655 * @file: file pointer, not actually used
1656 * @buf: where to get the data from
1657 * @count: bytes sent
1658 * @ppos: where to start
1659 *
1660 * Returns number of bytes written or error code, as appropriate
1661 */
1662static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1663 size_t count, loff_t *ppos)
1664{
1665 struct smack_known *skp;
1666 char temp[80];
1667 int i;
1668
1669 if (!smack_privileged(CAP_MAC_ADMIN))
1670 return -EPERM;
1671
1672 if (count >= sizeof(temp) || count == 0)
1673 return -EINVAL;
1674
1675 if (copy_from_user(temp, buf, count) != 0)
1676 return -EFAULT;
1677
1678 temp[count] = '\0';
1679
1680 if (sscanf(temp, "%d", &i) != 1)
1681 return -EINVAL;
1682
1683 /*
1684 * Don't do anything if the value hasn't actually changed.
1685 * If it is changing reset the level on entries that were
1686 * set up to be direct when they were created.
1687 */
1688 if (smack_cipso_direct != i) {
1689 mutex_lock(&smack_known_lock);
1690 list_for_each_entry_rcu(skp, &smack_known_list, list)
1691 if (skp->smk_netlabel.attr.mls.lvl ==
1692 smack_cipso_direct)
1693 skp->smk_netlabel.attr.mls.lvl = i;
1694 smack_cipso_direct = i;
1695 mutex_unlock(&smack_known_lock);
1696 }
1697
1698 return count;
1699}
1700
1701static const struct file_operations smk_direct_ops = {
1702 .read = smk_read_direct,
1703 .write = smk_write_direct,
1704 .llseek = default_llseek,
1705};
1706
1707/**
1708 * smk_read_mapped - read() for /smack/mapped
1709 * @filp: file pointer, not actually used
1710 * @buf: where to put the result
1711 * @count: maximum to send along
1712 * @ppos: where to start
1713 *
1714 * Returns number of bytes read or error code, as appropriate
1715 */
1716static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1717 size_t count, loff_t *ppos)
1718{
1719 char temp[80];
1720 ssize_t rc;
1721
1722 if (*ppos != 0)
1723 return 0;
1724
1725 sprintf(temp, "%d", smack_cipso_mapped);
1726 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1727
1728 return rc;
1729}
1730
1731/**
1732 * smk_write_mapped - write() for /smack/mapped
1733 * @file: file pointer, not actually used
1734 * @buf: where to get the data from
1735 * @count: bytes sent
1736 * @ppos: where to start
1737 *
1738 * Returns number of bytes written or error code, as appropriate
1739 */
1740static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1741 size_t count, loff_t *ppos)
1742{
1743 struct smack_known *skp;
1744 char temp[80];
1745 int i;
1746
1747 if (!smack_privileged(CAP_MAC_ADMIN))
1748 return -EPERM;
1749
1750 if (count >= sizeof(temp) || count == 0)
1751 return -EINVAL;
1752
1753 if (copy_from_user(temp, buf, count) != 0)
1754 return -EFAULT;
1755
1756 temp[count] = '\0';
1757
1758 if (sscanf(temp, "%d", &i) != 1)
1759 return -EINVAL;
1760
1761 /*
1762 * Don't do anything if the value hasn't actually changed.
1763 * If it is changing reset the level on entries that were
1764 * set up to be mapped when they were created.
1765 */
1766 if (smack_cipso_mapped != i) {
1767 mutex_lock(&smack_known_lock);
1768 list_for_each_entry_rcu(skp, &smack_known_list, list)
1769 if (skp->smk_netlabel.attr.mls.lvl ==
1770 smack_cipso_mapped)
1771 skp->smk_netlabel.attr.mls.lvl = i;
1772 smack_cipso_mapped = i;
1773 mutex_unlock(&smack_known_lock);
1774 }
1775
1776 return count;
1777}
1778
1779static const struct file_operations smk_mapped_ops = {
1780 .read = smk_read_mapped,
1781 .write = smk_write_mapped,
1782 .llseek = default_llseek,
1783};
1784
1785/**
1786 * smk_read_ambient - read() for /smack/ambient
1787 * @filp: file pointer, not actually used
1788 * @buf: where to put the result
1789 * @cn: maximum to send along
1790 * @ppos: where to start
1791 *
1792 * Returns number of bytes read or error code, as appropriate
1793 */
1794static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1795 size_t cn, loff_t *ppos)
1796{
1797 ssize_t rc;
1798 int asize;
1799
1800 if (*ppos != 0)
1801 return 0;
1802 /*
1803 * Being careful to avoid a problem in the case where
1804 * smack_net_ambient gets changed in midstream.
1805 */
1806 mutex_lock(&smack_ambient_lock);
1807
1808 asize = strlen(smack_net_ambient->smk_known) + 1;
1809
1810 if (cn >= asize)
1811 rc = simple_read_from_buffer(buf, cn, ppos,
1812 smack_net_ambient->smk_known,
1813 asize);
1814 else
1815 rc = -EINVAL;
1816
1817 mutex_unlock(&smack_ambient_lock);
1818
1819 return rc;
1820}
1821
1822/**
1823 * smk_write_ambient - write() for /smack/ambient
1824 * @file: file pointer, not actually used
1825 * @buf: where to get the data from
1826 * @count: bytes sent
1827 * @ppos: where to start
1828 *
1829 * Returns number of bytes written or error code, as appropriate
1830 */
1831static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1832 size_t count, loff_t *ppos)
1833{
1834 struct smack_known *skp;
1835 char *oldambient;
1836 char *data;
1837 int rc = count;
1838
1839 if (!smack_privileged(CAP_MAC_ADMIN))
1840 return -EPERM;
1841
1842 data = memdup_user_nul(buf, count);
1843 if (IS_ERR(data))
1844 return PTR_ERR(data);
1845
1846 skp = smk_import_entry(data, count);
1847 if (IS_ERR(skp)) {
1848 rc = PTR_ERR(skp);
1849 goto out;
1850 }
1851
1852 mutex_lock(&smack_ambient_lock);
1853
1854 oldambient = smack_net_ambient->smk_known;
1855 smack_net_ambient = skp;
1856 smk_unlbl_ambient(oldambient);
1857
1858 mutex_unlock(&smack_ambient_lock);
1859
1860out:
1861 kfree(data);
1862 return rc;
1863}
1864
1865static const struct file_operations smk_ambient_ops = {
1866 .read = smk_read_ambient,
1867 .write = smk_write_ambient,
1868 .llseek = default_llseek,
1869};
1870
1871/*
1872 * Seq_file operations for /smack/onlycap
1873 */
1874static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1875{
1876 return smk_seq_start(s, pos, &smack_onlycap_list);
1877}
1878
1879static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1880{
1881 return smk_seq_next(s, v, pos, &smack_onlycap_list);
1882}
1883
1884static int onlycap_seq_show(struct seq_file *s, void *v)
1885{
1886 struct list_head *list = v;
1887 struct smack_known_list_elem *sklep =
1888 list_entry_rcu(list, struct smack_known_list_elem, list);
1889
1890 seq_puts(s, sklep->smk_label->smk_known);
1891 seq_putc(s, ' ');
1892
1893 return 0;
1894}
1895
1896static const struct seq_operations onlycap_seq_ops = {
1897 .start = onlycap_seq_start,
1898 .next = onlycap_seq_next,
1899 .show = onlycap_seq_show,
1900 .stop = smk_seq_stop,
1901};
1902
1903static int smk_open_onlycap(struct inode *inode, struct file *file)
1904{
1905 return seq_open(file, &onlycap_seq_ops);
1906}
1907
1908/**
1909 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1910 * The caller must hold appropriate mutex to prevent concurrent modifications
1911 * to the public list.
1912 * Private list is assumed to be not accessible to other threads yet.
1913 *
1914 * @public: public list
1915 * @private: private list
1916 */
1917static void smk_list_swap_rcu(struct list_head *public,
1918 struct list_head *private)
1919{
1920 struct list_head *first, *last;
1921
1922 if (list_empty(public)) {
1923 list_splice_init_rcu(private, public, synchronize_rcu);
1924 } else {
1925 /* Remember public list before replacing it */
1926 first = public->next;
1927 last = public->prev;
1928
1929 /* Publish private list in place of public in RCU-safe way */
1930 private->prev->next = public;
1931 private->next->prev = public;
1932 rcu_assign_pointer(public->next, private->next);
1933 public->prev = private->prev;
1934
1935 synchronize_rcu();
1936
1937 /* When all readers are done with the old public list,
1938 * attach it in place of private */
1939 private->next = first;
1940 private->prev = last;
1941 first->prev = private;
1942 last->next = private;
1943 }
1944}
1945
1946/**
1947 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1948 *
1949 * @data: the string to parse
1950 * @private: destination list
1951 *
1952 * Returns zero on success or error code, as appropriate
1953 */
1954static int smk_parse_label_list(char *data, struct list_head *list)
1955{
1956 char *tok;
1957 struct smack_known *skp;
1958 struct smack_known_list_elem *sklep;
1959
1960 while ((tok = strsep(&data, " ")) != NULL) {
1961 if (!*tok)
1962 continue;
1963
1964 skp = smk_import_entry(tok, 0);
1965 if (IS_ERR(skp))
1966 return PTR_ERR(skp);
1967
1968 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1969 if (sklep == NULL)
1970 return -ENOMEM;
1971
1972 sklep->smk_label = skp;
1973 list_add(&sklep->list, list);
1974 }
1975
1976 return 0;
1977}
1978
1979/**
1980 * smk_destroy_label_list - destroy a list of smack_known_list_elem
1981 * @head: header pointer of the list to destroy
1982 */
1983void smk_destroy_label_list(struct list_head *list)
1984{
1985 struct smack_known_list_elem *sklep;
1986 struct smack_known_list_elem *sklep2;
1987
1988 list_for_each_entry_safe(sklep, sklep2, list, list)
1989 kfree(sklep);
1990
1991 INIT_LIST_HEAD(list);
1992}
1993
1994/**
1995 * smk_write_onlycap - write() for smackfs/onlycap
1996 * @file: file pointer, not actually used
1997 * @buf: where to get the data from
1998 * @count: bytes sent
1999 * @ppos: where to start
2000 *
2001 * Returns number of bytes written or error code, as appropriate
2002 */
2003static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
2004 size_t count, loff_t *ppos)
2005{
2006 char *data;
2007 LIST_HEAD(list_tmp);
2008 int rc;
2009
2010 if (!smack_privileged(CAP_MAC_ADMIN))
2011 return -EPERM;
2012
2013 data = memdup_user_nul(buf, count);
2014 if (IS_ERR(data))
2015 return PTR_ERR(data);
2016
2017 rc = smk_parse_label_list(data, &list_tmp);
2018 kfree(data);
2019
2020 /*
2021 * Clear the smack_onlycap on invalid label errors. This means
2022 * that we can pass a null string to unset the onlycap value.
2023 *
2024 * Importing will also reject a label beginning with '-',
2025 * so "-usecapabilities" will also work.
2026 *
2027 * But do so only on invalid label, not on system errors.
2028 * The invalid label must be first to count as clearing attempt.
2029 */
2030 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2031 mutex_lock(&smack_onlycap_lock);
2032 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2033 mutex_unlock(&smack_onlycap_lock);
2034 rc = count;
2035 }
2036
2037 smk_destroy_label_list(&list_tmp);
2038
2039 return rc;
2040}
2041
2042static const struct file_operations smk_onlycap_ops = {
2043 .open = smk_open_onlycap,
2044 .read = seq_read,
2045 .write = smk_write_onlycap,
2046 .llseek = seq_lseek,
2047 .release = seq_release,
2048};
2049
2050#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2051/**
2052 * smk_read_unconfined - read() for smackfs/unconfined
2053 * @filp: file pointer, not actually used
2054 * @buf: where to put the result
2055 * @cn: maximum to send along
2056 * @ppos: where to start
2057 *
2058 * Returns number of bytes read or error code, as appropriate
2059 */
2060static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2061 size_t cn, loff_t *ppos)
2062{
2063 char *smack = "";
2064 ssize_t rc = -EINVAL;
2065 int asize;
2066
2067 if (*ppos != 0)
2068 return 0;
2069
2070 if (smack_unconfined != NULL)
2071 smack = smack_unconfined->smk_known;
2072
2073 asize = strlen(smack) + 1;
2074
2075 if (cn >= asize)
2076 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2077
2078 return rc;
2079}
2080
2081/**
2082 * smk_write_unconfined - write() for smackfs/unconfined
2083 * @file: file pointer, not actually used
2084 * @buf: where to get the data from
2085 * @count: bytes sent
2086 * @ppos: where to start
2087 *
2088 * Returns number of bytes written or error code, as appropriate
2089 */
2090static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2091 size_t count, loff_t *ppos)
2092{
2093 char *data;
2094 struct smack_known *skp;
2095 int rc = count;
2096
2097 if (!smack_privileged(CAP_MAC_ADMIN))
2098 return -EPERM;
2099
2100 data = memdup_user_nul(buf, count);
2101 if (IS_ERR(data))
2102 return PTR_ERR(data);
2103
2104 /*
2105 * Clear the smack_unconfined on invalid label errors. This means
2106 * that we can pass a null string to unset the unconfined value.
2107 *
2108 * Importing will also reject a label beginning with '-',
2109 * so "-confine" will also work.
2110 *
2111 * But do so only on invalid label, not on system errors.
2112 */
2113 skp = smk_import_entry(data, count);
2114 if (PTR_ERR(skp) == -EINVAL)
2115 skp = NULL;
2116 else if (IS_ERR(skp)) {
2117 rc = PTR_ERR(skp);
2118 goto freeout;
2119 }
2120
2121 smack_unconfined = skp;
2122
2123freeout:
2124 kfree(data);
2125 return rc;
2126}
2127
2128static const struct file_operations smk_unconfined_ops = {
2129 .read = smk_read_unconfined,
2130 .write = smk_write_unconfined,
2131 .llseek = default_llseek,
2132};
2133#endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2134
2135/**
2136 * smk_read_logging - read() for /smack/logging
2137 * @filp: file pointer, not actually used
2138 * @buf: where to put the result
2139 * @cn: maximum to send along
2140 * @ppos: where to start
2141 *
2142 * Returns number of bytes read or error code, as appropriate
2143 */
2144static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2145 size_t count, loff_t *ppos)
2146{
2147 char temp[32];
2148 ssize_t rc;
2149
2150 if (*ppos != 0)
2151 return 0;
2152
2153 sprintf(temp, "%d\n", log_policy);
2154 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2155 return rc;
2156}
2157
2158/**
2159 * smk_write_logging - write() for /smack/logging
2160 * @file: file pointer, not actually used
2161 * @buf: where to get the data from
2162 * @count: bytes sent
2163 * @ppos: where to start
2164 *
2165 * Returns number of bytes written or error code, as appropriate
2166 */
2167static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2168 size_t count, loff_t *ppos)
2169{
2170 char temp[32];
2171 int i;
2172
2173 if (!smack_privileged(CAP_MAC_ADMIN))
2174 return -EPERM;
2175
2176 if (count >= sizeof(temp) || count == 0)
2177 return -EINVAL;
2178
2179 if (copy_from_user(temp, buf, count) != 0)
2180 return -EFAULT;
2181
2182 temp[count] = '\0';
2183
2184 if (sscanf(temp, "%d", &i) != 1)
2185 return -EINVAL;
2186 if (i < 0 || i > 3)
2187 return -EINVAL;
2188 log_policy = i;
2189 return count;
2190}
2191
2192
2193
2194static const struct file_operations smk_logging_ops = {
2195 .read = smk_read_logging,
2196 .write = smk_write_logging,
2197 .llseek = default_llseek,
2198};
2199
2200/*
2201 * Seq_file read operations for /smack/load-self
2202 */
2203
2204static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2205{
2206 struct task_smack *tsp = current_security();
2207
2208 return smk_seq_start(s, pos, &tsp->smk_rules);
2209}
2210
2211static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2212{
2213 struct task_smack *tsp = current_security();
2214
2215 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2216}
2217
2218static int load_self_seq_show(struct seq_file *s, void *v)
2219{
2220 struct list_head *list = v;
2221 struct smack_rule *srp =
2222 list_entry_rcu(list, struct smack_rule, list);
2223
2224 smk_rule_show(s, srp, SMK_LABELLEN);
2225
2226 return 0;
2227}
2228
2229static const struct seq_operations load_self_seq_ops = {
2230 .start = load_self_seq_start,
2231 .next = load_self_seq_next,
2232 .show = load_self_seq_show,
2233 .stop = smk_seq_stop,
2234};
2235
2236
2237/**
2238 * smk_open_load_self - open() for /smack/load-self2
2239 * @inode: inode structure representing file
2240 * @file: "load" file pointer
2241 *
2242 * For reading, use load_seq_* seq_file reading operations.
2243 */
2244static int smk_open_load_self(struct inode *inode, struct file *file)
2245{
2246 return seq_open(file, &load_self_seq_ops);
2247}
2248
2249/**
2250 * smk_write_load_self - write() for /smack/load-self
2251 * @file: file pointer, not actually used
2252 * @buf: where to get the data from
2253 * @count: bytes sent
2254 * @ppos: where to start - must be 0
2255 *
2256 */
2257static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2258 size_t count, loff_t *ppos)
2259{
2260 struct task_smack *tsp = current_security();
2261
2262 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2263 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2264}
2265
2266static const struct file_operations smk_load_self_ops = {
2267 .open = smk_open_load_self,
2268 .read = seq_read,
2269 .llseek = seq_lseek,
2270 .write = smk_write_load_self,
2271 .release = seq_release,
2272};
2273
2274/**
2275 * smk_user_access - handle access check transaction
2276 * @file: file pointer
2277 * @buf: data from user space
2278 * @count: bytes sent
2279 * @ppos: where to start - must be 0
2280 */
2281static ssize_t smk_user_access(struct file *file, const char __user *buf,
2282 size_t count, loff_t *ppos, int format)
2283{
2284 struct smack_parsed_rule rule;
2285 char *data;
2286 int res;
2287
2288 data = simple_transaction_get(file, buf, count);
2289 if (IS_ERR(data))
2290 return PTR_ERR(data);
2291
2292 if (format == SMK_FIXED24_FMT) {
2293 if (count < SMK_LOADLEN)
2294 return -EINVAL;
2295 res = smk_parse_rule(data, &rule, 0);
2296 } else {
2297 /*
2298 * simple_transaction_get() returns null-terminated data
2299 */
2300 res = smk_parse_long_rule(data, &rule, 0, 3);
2301 }
2302
2303 if (res >= 0)
2304 res = smk_access(rule.smk_subject, rule.smk_object,
2305 rule.smk_access1, NULL);
2306 else if (res != -ENOENT)
2307 return res;
2308
2309 /*
2310 * smk_access() can return a value > 0 in the "bringup" case.
2311 */
2312 data[0] = res >= 0 ? '1' : '0';
2313 data[1] = '\0';
2314
2315 simple_transaction_set(file, 2);
2316
2317 if (format == SMK_FIXED24_FMT)
2318 return SMK_LOADLEN;
2319 return count;
2320}
2321
2322/**
2323 * smk_write_access - handle access check transaction
2324 * @file: file pointer
2325 * @buf: data from user space
2326 * @count: bytes sent
2327 * @ppos: where to start - must be 0
2328 */
2329static ssize_t smk_write_access(struct file *file, const char __user *buf,
2330 size_t count, loff_t *ppos)
2331{
2332 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2333}
2334
2335static const struct file_operations smk_access_ops = {
2336 .write = smk_write_access,
2337 .read = simple_transaction_read,
2338 .release = simple_transaction_release,
2339 .llseek = generic_file_llseek,
2340};
2341
2342
2343/*
2344 * Seq_file read operations for /smack/load2
2345 */
2346
2347static int load2_seq_show(struct seq_file *s, void *v)
2348{
2349 struct list_head *list = v;
2350 struct smack_master_list *smlp =
2351 list_entry_rcu(list, struct smack_master_list, list);
2352
2353 smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);
2354
2355 return 0;
2356}
2357
2358static const struct seq_operations load2_seq_ops = {
2359 .start = load2_seq_start,
2360 .next = load2_seq_next,
2361 .show = load2_seq_show,
2362 .stop = smk_seq_stop,
2363};
2364
2365/**
2366 * smk_open_load2 - open() for /smack/load2
2367 * @inode: inode structure representing file
2368 * @file: "load2" file pointer
2369 *
2370 * For reading, use load2_seq_* seq_file reading operations.
2371 */
2372static int smk_open_load2(struct inode *inode, struct file *file)
2373{
2374 return seq_open(file, &load2_seq_ops);
2375}
2376
2377/**
2378 * smk_write_load2 - write() for /smack/load2
2379 * @file: file pointer, not actually used
2380 * @buf: where to get the data from
2381 * @count: bytes sent
2382 * @ppos: where to start - must be 0
2383 *
2384 */
2385static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2386 size_t count, loff_t *ppos)
2387{
2388 /*
2389 * Must have privilege.
2390 */
2391 if (!smack_privileged(CAP_MAC_ADMIN))
2392 return -EPERM;
2393
2394 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2395 SMK_LONG_FMT);
2396}
2397
2398static const struct file_operations smk_load2_ops = {
2399 .open = smk_open_load2,
2400 .read = seq_read,
2401 .llseek = seq_lseek,
2402 .write = smk_write_load2,
2403 .release = seq_release,
2404};
2405
2406/*
2407 * Seq_file read operations for /smack/load-self2
2408 */
2409
2410static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2411{
2412 struct task_smack *tsp = current_security();
2413
2414 return smk_seq_start(s, pos, &tsp->smk_rules);
2415}
2416
2417static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2418{
2419 struct task_smack *tsp = current_security();
2420
2421 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2422}
2423
2424static int load_self2_seq_show(struct seq_file *s, void *v)
2425{
2426 struct list_head *list = v;
2427 struct smack_rule *srp =
2428 list_entry_rcu(list, struct smack_rule, list);
2429
2430 smk_rule_show(s, srp, SMK_LONGLABEL);
2431
2432 return 0;
2433}
2434
2435static const struct seq_operations load_self2_seq_ops = {
2436 .start = load_self2_seq_start,
2437 .next = load_self2_seq_next,
2438 .show = load_self2_seq_show,
2439 .stop = smk_seq_stop,
2440};
2441
2442/**
2443 * smk_open_load_self2 - open() for /smack/load-self2
2444 * @inode: inode structure representing file
2445 * @file: "load" file pointer
2446 *
2447 * For reading, use load_seq_* seq_file reading operations.
2448 */
2449static int smk_open_load_self2(struct inode *inode, struct file *file)
2450{
2451 return seq_open(file, &load_self2_seq_ops);
2452}
2453
2454/**
2455 * smk_write_load_self2 - write() for /smack/load-self2
2456 * @file: file pointer, not actually used
2457 * @buf: where to get the data from
2458 * @count: bytes sent
2459 * @ppos: where to start - must be 0
2460 *
2461 */
2462static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2463 size_t count, loff_t *ppos)
2464{
2465 struct task_smack *tsp = current_security();
2466
2467 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2468 &tsp->smk_rules_lock, SMK_LONG_FMT);
2469}
2470
2471static const struct file_operations smk_load_self2_ops = {
2472 .open = smk_open_load_self2,
2473 .read = seq_read,
2474 .llseek = seq_lseek,
2475 .write = smk_write_load_self2,
2476 .release = seq_release,
2477};
2478
2479/**
2480 * smk_write_access2 - handle access check transaction
2481 * @file: file pointer
2482 * @buf: data from user space
2483 * @count: bytes sent
2484 * @ppos: where to start - must be 0
2485 */
2486static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2487 size_t count, loff_t *ppos)
2488{
2489 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2490}
2491
2492static const struct file_operations smk_access2_ops = {
2493 .write = smk_write_access2,
2494 .read = simple_transaction_read,
2495 .release = simple_transaction_release,
2496 .llseek = generic_file_llseek,
2497};
2498
2499/**
2500 * smk_write_revoke_subj - write() for /smack/revoke-subject
2501 * @file: file pointer
2502 * @buf: data from user space
2503 * @count: bytes sent
2504 * @ppos: where to start - must be 0
2505 */
2506static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2507 size_t count, loff_t *ppos)
2508{
2509 char *data;
2510 const char *cp;
2511 struct smack_known *skp;
2512 struct smack_rule *sp;
2513 struct list_head *rule_list;
2514 struct mutex *rule_lock;
2515 int rc = count;
2516
2517 if (*ppos != 0)
2518 return -EINVAL;
2519
2520 if (!smack_privileged(CAP_MAC_ADMIN))
2521 return -EPERM;
2522
2523 if (count == 0 || count > SMK_LONGLABEL)
2524 return -EINVAL;
2525
2526 data = kzalloc(count, GFP_KERNEL);
2527 if (data == NULL)
2528 return -ENOMEM;
2529
2530 if (copy_from_user(data, buf, count) != 0) {
2531 rc = -EFAULT;
2532 goto out_data;
2533 }
2534
2535 cp = smk_parse_smack(data, count);
2536 if (IS_ERR(cp)) {
2537 rc = PTR_ERR(cp);
2538 goto out_data;
2539 }
2540
2541 skp = smk_find_entry(cp);
2542 if (skp == NULL)
2543 goto out_cp;
2544
2545 rule_list = &skp->smk_rules;
2546 rule_lock = &skp->smk_rules_lock;
2547
2548 mutex_lock(rule_lock);
2549
2550 list_for_each_entry_rcu(sp, rule_list, list)
2551 sp->smk_access = 0;
2552
2553 mutex_unlock(rule_lock);
2554
2555out_cp:
2556 kfree(cp);
2557out_data:
2558 kfree(data);
2559
2560 return rc;
2561}
2562
2563static const struct file_operations smk_revoke_subj_ops = {
2564 .write = smk_write_revoke_subj,
2565 .read = simple_transaction_read,
2566 .release = simple_transaction_release,
2567 .llseek = generic_file_llseek,
2568};
2569
2570/**
2571 * smk_init_sysfs - initialize /sys/fs/smackfs
2572 *
2573 */
2574static int smk_init_sysfs(void)
2575{
2576 return sysfs_create_mount_point(fs_kobj, "smackfs");
2577}
2578
2579/**
2580 * smk_write_change_rule - write() for /smack/change-rule
2581 * @file: file pointer
2582 * @buf: data from user space
2583 * @count: bytes sent
2584 * @ppos: where to start - must be 0
2585 */
2586static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2587 size_t count, loff_t *ppos)
2588{
2589 /*
2590 * Must have privilege.
2591 */
2592 if (!smack_privileged(CAP_MAC_ADMIN))
2593 return -EPERM;
2594
2595 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2596 SMK_CHANGE_FMT);
2597}
2598
2599static const struct file_operations smk_change_rule_ops = {
2600 .write = smk_write_change_rule,
2601 .read = simple_transaction_read,
2602 .release = simple_transaction_release,
2603 .llseek = generic_file_llseek,
2604};
2605
2606/**
2607 * smk_read_syslog - read() for smackfs/syslog
2608 * @filp: file pointer, not actually used
2609 * @buf: where to put the result
2610 * @cn: maximum to send along
2611 * @ppos: where to start
2612 *
2613 * Returns number of bytes read or error code, as appropriate
2614 */
2615static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2616 size_t cn, loff_t *ppos)
2617{
2618 struct smack_known *skp;
2619 ssize_t rc = -EINVAL;
2620 int asize;
2621
2622 if (*ppos != 0)
2623 return 0;
2624
2625 if (smack_syslog_label == NULL)
2626 skp = &smack_known_star;
2627 else
2628 skp = smack_syslog_label;
2629
2630 asize = strlen(skp->smk_known) + 1;
2631
2632 if (cn >= asize)
2633 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2634 asize);
2635
2636 return rc;
2637}
2638
2639/**
2640 * smk_write_syslog - write() for smackfs/syslog
2641 * @file: file pointer, not actually used
2642 * @buf: where to get the data from
2643 * @count: bytes sent
2644 * @ppos: where to start
2645 *
2646 * Returns number of bytes written or error code, as appropriate
2647 */
2648static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2649 size_t count, loff_t *ppos)
2650{
2651 char *data;
2652 struct smack_known *skp;
2653 int rc = count;
2654
2655 if (!smack_privileged(CAP_MAC_ADMIN))
2656 return -EPERM;
2657
2658 data = memdup_user_nul(buf, count);
2659 if (IS_ERR(data))
2660 return PTR_ERR(data);
2661
2662 skp = smk_import_entry(data, count);
2663 if (IS_ERR(skp))
2664 rc = PTR_ERR(skp);
2665 else
2666 smack_syslog_label = skp;
2667
2668 kfree(data);
2669 return rc;
2670}
2671
2672static const struct file_operations smk_syslog_ops = {
2673 .read = smk_read_syslog,
2674 .write = smk_write_syslog,
2675 .llseek = default_llseek,
2676};
2677
2678/*
2679 * Seq_file read operations for /smack/relabel-self
2680 */
2681
2682static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2683{
2684 struct task_smack *tsp = current_security();
2685
2686 return smk_seq_start(s, pos, &tsp->smk_relabel);
2687}
2688
2689static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2690{
2691 struct task_smack *tsp = current_security();
2692
2693 return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2694}
2695
2696static int relabel_self_seq_show(struct seq_file *s, void *v)
2697{
2698 struct list_head *list = v;
2699 struct smack_known_list_elem *sklep =
2700 list_entry(list, struct smack_known_list_elem, list);
2701
2702 seq_puts(s, sklep->smk_label->smk_known);
2703 seq_putc(s, ' ');
2704
2705 return 0;
2706}
2707
2708static const struct seq_operations relabel_self_seq_ops = {
2709 .start = relabel_self_seq_start,
2710 .next = relabel_self_seq_next,
2711 .show = relabel_self_seq_show,
2712 .stop = smk_seq_stop,
2713};
2714
2715/**
2716 * smk_open_relabel_self - open() for /smack/relabel-self
2717 * @inode: inode structure representing file
2718 * @file: "relabel-self" file pointer
2719 *
2720 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2721 * file_operations
2722 */
2723static int smk_open_relabel_self(struct inode *inode, struct file *file)
2724{
2725 return seq_open(file, &relabel_self_seq_ops);
2726}
2727
2728/**
2729 * smk_write_relabel_self - write() for /smack/relabel-self
2730 * @file: file pointer, not actually used
2731 * @buf: where to get the data from
2732 * @count: bytes sent
2733 * @ppos: where to start - must be 0
2734 *
2735 */
2736static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2737 size_t count, loff_t *ppos)
2738{
2739 struct task_smack *tsp = current_security();
2740 char *data;
2741 int rc;
2742 LIST_HEAD(list_tmp);
2743
2744 /*
2745 * Must have privilege.
2746 */
2747 if (!smack_privileged(CAP_MAC_ADMIN))
2748 return -EPERM;
2749
2750 /*
2751 * Enough data must be present.
2752 */
2753 if (*ppos != 0)
2754 return -EINVAL;
2755
2756 data = memdup_user_nul(buf, count);
2757 if (IS_ERR(data))
2758 return PTR_ERR(data);
2759
2760 rc = smk_parse_label_list(data, &list_tmp);
2761 kfree(data);
2762
2763 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2764 smk_destroy_label_list(&tsp->smk_relabel);
2765 list_splice(&list_tmp, &tsp->smk_relabel);
2766 return count;
2767 }
2768
2769 smk_destroy_label_list(&list_tmp);
2770 return rc;
2771}
2772
2773static const struct file_operations smk_relabel_self_ops = {
2774 .open = smk_open_relabel_self,
2775 .read = seq_read,
2776 .llseek = seq_lseek,
2777 .write = smk_write_relabel_self,
2778 .release = seq_release,
2779};
2780
2781/**
2782 * smk_read_ptrace - read() for /smack/ptrace
2783 * @filp: file pointer, not actually used
2784 * @buf: where to put the result
2785 * @count: maximum to send along
2786 * @ppos: where to start
2787 *
2788 * Returns number of bytes read or error code, as appropriate
2789 */
2790static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2791 size_t count, loff_t *ppos)
2792{
2793 char temp[32];
2794 ssize_t rc;
2795
2796 if (*ppos != 0)
2797 return 0;
2798
2799 sprintf(temp, "%d\n", smack_ptrace_rule);
2800 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2801 return rc;
2802}
2803
2804/**
2805 * smk_write_ptrace - write() for /smack/ptrace
2806 * @file: file pointer
2807 * @buf: data from user space
2808 * @count: bytes sent
2809 * @ppos: where to start - must be 0
2810 */
2811static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2812 size_t count, loff_t *ppos)
2813{
2814 char temp[32];
2815 int i;
2816
2817 if (!smack_privileged(CAP_MAC_ADMIN))
2818 return -EPERM;
2819
2820 if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2821 return -EINVAL;
2822
2823 if (copy_from_user(temp, buf, count) != 0)
2824 return -EFAULT;
2825
2826 temp[count] = '\0';
2827
2828 if (sscanf(temp, "%d", &i) != 1)
2829 return -EINVAL;
2830 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2831 return -EINVAL;
2832 smack_ptrace_rule = i;
2833
2834 return count;
2835}
2836
2837static const struct file_operations smk_ptrace_ops = {
2838 .write = smk_write_ptrace,
2839 .read = smk_read_ptrace,
2840 .llseek = default_llseek,
2841};
2842
2843/**
2844 * smk_fill_super - fill the smackfs superblock
2845 * @sb: the empty superblock
2846 * @data: unused
2847 * @silent: unused
2848 *
2849 * Fill in the well known entries for the smack filesystem
2850 *
2851 * Returns 0 on success, an error code on failure
2852 */
2853static int smk_fill_super(struct super_block *sb, void *data, int silent)
2854{
2855 int rc;
2856 struct inode *root_inode;
2857
2858 static struct tree_descr smack_files[] = {
2859 [SMK_LOAD] = {
2860 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2861 [SMK_CIPSO] = {
2862 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2863 [SMK_DOI] = {
2864 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2865 [SMK_DIRECT] = {
2866 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2867 [SMK_AMBIENT] = {
2868 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2869 [SMK_NET4ADDR] = {
2870 "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2871 [SMK_ONLYCAP] = {
2872 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2873 [SMK_LOGGING] = {
2874 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2875 [SMK_LOAD_SELF] = {
2876 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2877 [SMK_ACCESSES] = {
2878 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2879 [SMK_MAPPED] = {
2880 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2881 [SMK_LOAD2] = {
2882 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2883 [SMK_LOAD_SELF2] = {
2884 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2885 [SMK_ACCESS2] = {
2886 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2887 [SMK_CIPSO2] = {
2888 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2889 [SMK_REVOKE_SUBJ] = {
2890 "revoke-subject", &smk_revoke_subj_ops,
2891 S_IRUGO|S_IWUSR},
2892 [SMK_CHANGE_RULE] = {
2893 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2894 [SMK_SYSLOG] = {
2895 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2896 [SMK_PTRACE] = {
2897 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2898#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2899 [SMK_UNCONFINED] = {
2900 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2901#endif
2902#if IS_ENABLED(CONFIG_IPV6)
2903 [SMK_NET6ADDR] = {
2904 "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2905#endif /* CONFIG_IPV6 */
2906 [SMK_RELABEL_SELF] = {
2907 "relabel-self", &smk_relabel_self_ops,
2908 S_IRUGO|S_IWUGO},
2909 /* last one */
2910 {""}
2911 };
2912
2913 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2914 if (rc != 0) {
2915 printk(KERN_ERR "%s failed %d while creating inodes\n",
2916 __func__, rc);
2917 return rc;
2918 }
2919
2920 root_inode = d_inode(sb->s_root);
2921
2922 return 0;
2923}
2924
2925/**
2926 * smk_mount - get the smackfs superblock
2927 * @fs_type: passed along without comment
2928 * @flags: passed along without comment
2929 * @dev_name: passed along without comment
2930 * @data: passed along without comment
2931 *
2932 * Just passes everything along.
2933 *
2934 * Returns what the lower level code does.
2935 */
2936static struct dentry *smk_mount(struct file_system_type *fs_type,
2937 int flags, const char *dev_name, void *data)
2938{
2939 return mount_single(fs_type, flags, data, smk_fill_super);
2940}
2941
2942static struct file_system_type smk_fs_type = {
2943 .name = "smackfs",
2944 .mount = smk_mount,
2945 .kill_sb = kill_litter_super,
2946};
2947
2948static struct vfsmount *smackfs_mount;
2949
2950static int __init smk_preset_netlabel(struct smack_known *skp)
2951{
2952 skp->smk_netlabel.domain = skp->smk_known;
2953 skp->smk_netlabel.flags =
2954 NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2955 return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2956 &skp->smk_netlabel, strlen(skp->smk_known));
2957}
2958
2959/**
2960 * init_smk_fs - get the smackfs superblock
2961 *
2962 * register the smackfs
2963 *
2964 * Do not register smackfs if Smack wasn't enabled
2965 * on boot. We can not put this method normally under the
2966 * smack_init() code path since the security subsystem get
2967 * initialized before the vfs caches.
2968 *
2969 * Returns true if we were not chosen on boot or if
2970 * we were chosen and filesystem registration succeeded.
2971 */
2972static int __init init_smk_fs(void)
2973{
2974 int err;
2975 int rc;
2976
2977 if (smack_enabled == 0)
2978 return 0;
2979
2980 err = smk_init_sysfs();
2981 if (err)
2982 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
2983
2984 err = register_filesystem(&smk_fs_type);
2985 if (!err) {
2986 smackfs_mount = kern_mount(&smk_fs_type);
2987 if (IS_ERR(smackfs_mount)) {
2988 printk(KERN_ERR "smackfs: could not mount!\n");
2989 err = PTR_ERR(smackfs_mount);
2990 smackfs_mount = NULL;
2991 }
2992 }
2993
2994 smk_cipso_doi();
2995 smk_unlbl_ambient(NULL);
2996
2997 rc = smk_preset_netlabel(&smack_known_floor);
2998 if (err == 0 && rc < 0)
2999 err = rc;
3000 rc = smk_preset_netlabel(&smack_known_hat);
3001 if (err == 0 && rc < 0)
3002 err = rc;
3003 rc = smk_preset_netlabel(&smack_known_huh);
3004 if (err == 0 && rc < 0)
3005 err = rc;
3006 rc = smk_preset_netlabel(&smack_known_invalid);
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);