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/mount.h>
27#include <linux/fs_context.h>
28#include "smack.h"
29
30#define BEBITS (sizeof(__be32) * 8)
31/*
32 * smackfs pseudo filesystem.
33 */
34
35enum smk_inos {
36 SMK_ROOT_INO = 2,
37 SMK_LOAD = 3, /* load policy */
38 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
39 SMK_DOI = 5, /* CIPSO DOI */
40 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
41 SMK_AMBIENT = 7, /* internet ambient label */
42 SMK_NET4ADDR = 8, /* single label hosts */
43 SMK_ONLYCAP = 9, /* the only "capable" label */
44 SMK_LOGGING = 10, /* logging */
45 SMK_LOAD_SELF = 11, /* task specific rules */
46 SMK_ACCESSES = 12, /* access policy */
47 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
48 SMK_LOAD2 = 14, /* load policy with long labels */
49 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
50 SMK_ACCESS2 = 16, /* make an access check with long labels */
51 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
52 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
53 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
54 SMK_SYSLOG = 20, /* change syslog label) */
55 SMK_PTRACE = 21, /* set ptrace rule */
56#ifdef CONFIG_SECURITY_SMACK_BRINGUP
57 SMK_UNCONFINED = 22, /* define an unconfined label */
58#endif
59#if IS_ENABLED(CONFIG_IPV6)
60 SMK_NET6ADDR = 23, /* single label IPv6 hosts */
61#endif /* CONFIG_IPV6 */
62 SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
63};
64
65/*
66 * List locks
67 */
68static DEFINE_MUTEX(smack_cipso_lock);
69static DEFINE_MUTEX(smack_ambient_lock);
70static DEFINE_MUTEX(smk_net4addr_lock);
71#if IS_ENABLED(CONFIG_IPV6)
72static DEFINE_MUTEX(smk_net6addr_lock);
73#endif /* CONFIG_IPV6 */
74
75/*
76 * This is the "ambient" label for network traffic.
77 * If it isn't somehow marked, use this.
78 * It can be reset via smackfs/ambient
79 */
80struct smack_known *smack_net_ambient;
81
82/*
83 * This is the level in a CIPSO header that indicates a
84 * smack label is contained directly in the category set.
85 * It can be reset via smackfs/direct
86 */
87int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
88
89/*
90 * This is the level in a CIPSO header that indicates a
91 * secid is contained directly in the category set.
92 * It can be reset via smackfs/mapped
93 */
94int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
95
96#ifdef CONFIG_SECURITY_SMACK_BRINGUP
97/*
98 * Allow one label to be unconfined. This is for
99 * debugging and application bring-up purposes only.
100 * It is bad and wrong, but everyone seems to expect
101 * to have it.
102 */
103struct smack_known *smack_unconfined;
104#endif
105
106/*
107 * If this value is set restrict syslog use to the label specified.
108 * It can be reset via smackfs/syslog
109 */
110struct smack_known *smack_syslog_label;
111
112/*
113 * Ptrace current rule
114 * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
115 * SMACK_PTRACE_EXACT labels must match, but can be overriden with
116 * CAP_SYS_PTRACE
117 * SMACK_PTRACE_DRACONIAN labels must match, CAP_SYS_PTRACE has no effect
118 */
119int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
120
121/*
122 * Certain IP addresses may be designated as single label hosts.
123 * Packets are sent there unlabeled, but only from tasks that
124 * can write to the specified label.
125 */
126
127LIST_HEAD(smk_net4addr_list);
128#if IS_ENABLED(CONFIG_IPV6)
129LIST_HEAD(smk_net6addr_list);
130#endif /* CONFIG_IPV6 */
131
132/*
133 * Rule lists are maintained for each label.
134 */
135struct smack_parsed_rule {
136 struct smack_known *smk_subject;
137 struct smack_known *smk_object;
138 int smk_access1;
139 int smk_access2;
140};
141
142static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
143
144/*
145 * Values for parsing cipso rules
146 * SMK_DIGITLEN: Length of a digit field in a rule.
147 * SMK_CIPSOMIN: Minimum possible cipso rule length.
148 * SMK_CIPSOMAX: Maximum possible cipso rule length.
149 */
150#define SMK_DIGITLEN 4
151#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
152#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
153
154/*
155 * Values for parsing MAC rules
156 * SMK_ACCESS: Maximum possible combination of access permissions
157 * SMK_ACCESSLEN: Maximum length for a rule access field
158 * SMK_LOADLEN: Smack rule length
159 */
160#define SMK_OACCESS "rwxa"
161#define SMK_ACCESS "rwxatl"
162#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
163#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
164#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
165#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
166
167/*
168 * Stricly for CIPSO level manipulation.
169 * Set the category bit number in a smack label sized buffer.
170 */
171static inline void smack_catset_bit(unsigned int cat, char *catsetp)
172{
173 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
174 return;
175
176 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
177}
178
179/**
180 * smk_netlabel_audit_set - fill a netlbl_audit struct
181 * @nap: structure to fill
182 */
183static void smk_netlabel_audit_set(struct netlbl_audit *nap)
184{
185 nap->loginuid = audit_get_loginuid(current);
186 nap->sessionid = audit_get_sessionid(current);
187 nap->prop.smack.skp = smk_of_current();
188}
189
190/*
191 * Value for parsing single label host rules
192 * "1.2.3.4 X"
193 */
194#define SMK_NETLBLADDRMIN 9
195
196/**
197 * smk_set_access - add a rule to the rule list or replace an old rule
198 * @srp: the rule to add or replace
199 * @rule_list: the list of rules
200 * @rule_lock: the rule list lock
201 *
202 * Looks through the current subject/object/access list for
203 * the subject/object pair and replaces the access that was
204 * there. If the pair isn't found add it with the specified
205 * access.
206 *
207 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
208 * during the allocation of the new pair to add.
209 */
210static int smk_set_access(struct smack_parsed_rule *srp,
211 struct list_head *rule_list,
212 struct mutex *rule_lock)
213{
214 struct smack_rule *sp;
215 int found = 0;
216 int rc = 0;
217
218 mutex_lock(rule_lock);
219
220 /*
221 * Because the object label is less likely to match
222 * than the subject label check it first
223 */
224 list_for_each_entry_rcu(sp, rule_list, list) {
225 if (sp->smk_object == srp->smk_object &&
226 sp->smk_subject == srp->smk_subject) {
227 found = 1;
228 sp->smk_access |= srp->smk_access1;
229 sp->smk_access &= ~srp->smk_access2;
230 break;
231 }
232 }
233
234 if (found == 0) {
235 sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL);
236 if (sp == NULL) {
237 rc = -ENOMEM;
238 goto out;
239 }
240
241 sp->smk_subject = srp->smk_subject;
242 sp->smk_object = srp->smk_object;
243 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
244
245 list_add_rcu(&sp->list, rule_list);
246 }
247
248out:
249 mutex_unlock(rule_lock);
250 return rc;
251}
252
253/**
254 * smk_perm_from_str - parse smack accesses from a text string
255 * @string: a text string that contains a Smack accesses code
256 *
257 * Returns an integer with respective bits set for specified accesses.
258 */
259static int smk_perm_from_str(const char *string)
260{
261 int perm = 0;
262 const char *cp;
263
264 for (cp = string; ; cp++)
265 switch (*cp) {
266 case '-':
267 break;
268 case 'r':
269 case 'R':
270 perm |= MAY_READ;
271 break;
272 case 'w':
273 case 'W':
274 perm |= MAY_WRITE;
275 break;
276 case 'x':
277 case 'X':
278 perm |= MAY_EXEC;
279 break;
280 case 'a':
281 case 'A':
282 perm |= MAY_APPEND;
283 break;
284 case 't':
285 case 'T':
286 perm |= MAY_TRANSMUTE;
287 break;
288 case 'l':
289 case 'L':
290 perm |= MAY_LOCK;
291 break;
292 case 'b':
293 case 'B':
294 perm |= MAY_BRINGUP;
295 break;
296 default:
297 return perm;
298 }
299}
300
301/**
302 * smk_fill_rule - Fill Smack rule from strings
303 * @subject: subject label string
304 * @object: object label string
305 * @access1: access string
306 * @access2: string with permissions to be removed
307 * @rule: Smack rule
308 * @import: if non-zero, import labels
309 * @len: label length limit
310 *
311 * Returns 0 on success, appropriate error code on failure.
312 */
313static int smk_fill_rule(const char *subject, const char *object,
314 const char *access1, const char *access2,
315 struct smack_parsed_rule *rule, int import,
316 int len)
317{
318 const char *cp;
319 struct smack_known *skp;
320
321 if (import) {
322 rule->smk_subject = smk_import_entry(subject, len);
323 if (IS_ERR(rule->smk_subject))
324 return PTR_ERR(rule->smk_subject);
325
326 rule->smk_object = smk_import_entry(object, len);
327 if (IS_ERR(rule->smk_object))
328 return PTR_ERR(rule->smk_object);
329 } else {
330 cp = smk_parse_smack(subject, len);
331 if (IS_ERR(cp))
332 return PTR_ERR(cp);
333 skp = smk_find_entry(cp);
334 kfree(cp);
335 if (skp == NULL)
336 return -ENOENT;
337 rule->smk_subject = skp;
338
339 cp = smk_parse_smack(object, len);
340 if (IS_ERR(cp))
341 return PTR_ERR(cp);
342 skp = smk_find_entry(cp);
343 kfree(cp);
344 if (skp == NULL)
345 return -ENOENT;
346 rule->smk_object = skp;
347 }
348
349 rule->smk_access1 = smk_perm_from_str(access1);
350 if (access2)
351 rule->smk_access2 = smk_perm_from_str(access2);
352 else
353 rule->smk_access2 = ~rule->smk_access1;
354
355 return 0;
356}
357
358/**
359 * smk_parse_rule - parse Smack rule from load string
360 * @data: string to be parsed whose size is SMK_LOADLEN
361 * @rule: Smack rule
362 * @import: if non-zero, import labels
363 *
364 * Returns 0 on success, -1 on errors.
365 */
366static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
367 int import)
368{
369 int rc;
370
371 rc = smk_fill_rule(data, data + SMK_LABELLEN,
372 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
373 import, SMK_LABELLEN);
374 return rc;
375}
376
377/**
378 * smk_parse_long_rule - parse Smack rule from rule string
379 * @data: string to be parsed, null terminated
380 * @rule: Will be filled with Smack parsed rule
381 * @import: if non-zero, import labels
382 * @tokens: number of substrings expected in data
383 *
384 * Returns number of processed bytes on success, -ERRNO on failure.
385 */
386static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
387 int import, int tokens)
388{
389 ssize_t cnt = 0;
390 char *tok[4];
391 int rc;
392 int i;
393
394 /*
395 * Parsing the rule in-place, filling all white-spaces with '\0'
396 */
397 for (i = 0; i < tokens; ++i) {
398 while (isspace(data[cnt]))
399 data[cnt++] = '\0';
400
401 if (data[cnt] == '\0')
402 /* Unexpected end of data */
403 return -EINVAL;
404
405 tok[i] = data + cnt;
406
407 while (data[cnt] && !isspace(data[cnt]))
408 ++cnt;
409 }
410 while (isspace(data[cnt]))
411 data[cnt++] = '\0';
412
413 while (i < 4)
414 tok[i++] = NULL;
415
416 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
417 return rc == 0 ? cnt : rc;
418}
419
420#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
421#define SMK_LONG_FMT 1 /* Variable long label format */
422#define SMK_CHANGE_FMT 2 /* Rule modification format */
423/**
424 * smk_write_rules_list - write() for any /smack rule file
425 * @file: file pointer, not actually used
426 * @buf: where to get the data from
427 * @count: bytes sent
428 * @ppos: where to start - must be 0
429 * @rule_list: the list of rules to write to
430 * @rule_lock: lock for the rule list
431 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
432 *
433 * Get one smack access rule from above.
434 * The format for SMK_LONG_FMT is:
435 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
436 * The format for SMK_FIXED24_FMT is exactly:
437 * "subject object rwxat"
438 * The format for SMK_CHANGE_FMT is:
439 * "subject<whitespace>object<whitespace>
440 * acc_enable<whitespace>acc_disable[<whitespace>...]"
441 */
442static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
443 size_t count, loff_t *ppos,
444 struct list_head *rule_list,
445 struct mutex *rule_lock, int format)
446{
447 struct smack_parsed_rule rule;
448 char *data;
449 int rc;
450 int trunc = 0;
451 int tokens;
452 ssize_t cnt = 0;
453
454 /*
455 * No partial writes.
456 * Enough data must be present.
457 */
458 if (*ppos != 0)
459 return -EINVAL;
460
461 if (format == SMK_FIXED24_FMT) {
462 /*
463 * Minor hack for backward compatibility
464 */
465 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
466 return -EINVAL;
467 } else {
468 if (count >= PAGE_SIZE) {
469 count = PAGE_SIZE - 1;
470 trunc = 1;
471 }
472 }
473
474 data = memdup_user_nul(buf, count);
475 if (IS_ERR(data))
476 return PTR_ERR(data);
477
478 /*
479 * In case of parsing only part of user buf,
480 * avoid having partial rule at the data buffer
481 */
482 if (trunc) {
483 while (count > 0 && (data[count - 1] != '\n'))
484 --count;
485 if (count == 0) {
486 rc = -EINVAL;
487 goto out;
488 }
489 }
490
491 data[count] = '\0';
492 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
493 while (cnt < count) {
494 if (format == SMK_FIXED24_FMT) {
495 rc = smk_parse_rule(data, &rule, 1);
496 if (rc < 0)
497 goto out;
498 cnt = count;
499 } else {
500 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
501 if (rc < 0)
502 goto out;
503 if (rc == 0) {
504 rc = -EINVAL;
505 goto out;
506 }
507 cnt += rc;
508 }
509
510 if (rule_list == NULL)
511 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
512 &rule.smk_subject->smk_rules_lock);
513 else
514 rc = smk_set_access(&rule, rule_list, rule_lock);
515
516 if (rc)
517 goto out;
518 }
519
520 rc = cnt;
521out:
522 kfree(data);
523 return rc;
524}
525
526/*
527 * Core logic for smackfs seq list operations.
528 */
529
530static void *smk_seq_start(struct seq_file *s, loff_t *pos,
531 struct list_head *head)
532{
533 struct list_head *list;
534 int i = *pos;
535
536 rcu_read_lock();
537 for (list = rcu_dereference(list_next_rcu(head));
538 list != head;
539 list = rcu_dereference(list_next_rcu(list))) {
540 if (i-- == 0)
541 return list;
542 }
543
544 return NULL;
545}
546
547static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
548 struct list_head *head)
549{
550 struct list_head *list = v;
551
552 ++*pos;
553 list = rcu_dereference(list_next_rcu(list));
554
555 return (list == head) ? NULL : list;
556}
557
558static void smk_seq_stop(struct seq_file *s, void *v)
559{
560 rcu_read_unlock();
561}
562
563static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
564{
565 /*
566 * Don't show any rules with label names too long for
567 * interface file (/smack/load or /smack/load2)
568 * because you should expect to be able to write
569 * anything you read back.
570 */
571 if (strlen(srp->smk_subject->smk_known) >= max ||
572 strlen(srp->smk_object->smk_known) >= max)
573 return;
574
575 if (srp->smk_access == 0)
576 return;
577
578 seq_printf(s, "%s %s",
579 srp->smk_subject->smk_known,
580 srp->smk_object->smk_known);
581
582 seq_putc(s, ' ');
583
584 if (srp->smk_access & MAY_READ)
585 seq_putc(s, 'r');
586 if (srp->smk_access & MAY_WRITE)
587 seq_putc(s, 'w');
588 if (srp->smk_access & MAY_EXEC)
589 seq_putc(s, 'x');
590 if (srp->smk_access & MAY_APPEND)
591 seq_putc(s, 'a');
592 if (srp->smk_access & MAY_TRANSMUTE)
593 seq_putc(s, 't');
594 if (srp->smk_access & MAY_LOCK)
595 seq_putc(s, 'l');
596 if (srp->smk_access & MAY_BRINGUP)
597 seq_putc(s, 'b');
598
599 seq_putc(s, '\n');
600}
601
602/*
603 * Seq_file read operations for /smack/load
604 */
605
606static void *load2_seq_start(struct seq_file *s, loff_t *pos)
607{
608 return smk_seq_start(s, pos, &smack_known_list);
609}
610
611static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
612{
613 return smk_seq_next(s, v, pos, &smack_known_list);
614}
615
616static int load_seq_show(struct seq_file *s, void *v)
617{
618 struct list_head *list = v;
619 struct smack_rule *srp;
620 struct smack_known *skp =
621 list_entry_rcu(list, struct smack_known, list);
622
623 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
624 smk_rule_show(s, srp, SMK_LABELLEN);
625
626 return 0;
627}
628
629static const struct seq_operations load_seq_ops = {
630 .start = load2_seq_start,
631 .next = load2_seq_next,
632 .show = load_seq_show,
633 .stop = smk_seq_stop,
634};
635
636/**
637 * smk_open_load - open() for /smack/load
638 * @inode: inode structure representing file
639 * @file: "load" file pointer
640 *
641 * For reading, use load_seq_* seq_file reading operations.
642 */
643static int smk_open_load(struct inode *inode, struct file *file)
644{
645 return seq_open(file, &load_seq_ops);
646}
647
648/**
649 * smk_write_load - write() for /smack/load
650 * @file: file pointer, not actually used
651 * @buf: where to get the data from
652 * @count: bytes sent
653 * @ppos: where to start - must be 0
654 *
655 */
656static ssize_t smk_write_load(struct file *file, const char __user *buf,
657 size_t count, loff_t *ppos)
658{
659 /*
660 * Must have privilege.
661 * No partial writes.
662 * Enough data must be present.
663 */
664 if (!smack_privileged(CAP_MAC_ADMIN))
665 return -EPERM;
666
667 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
668 SMK_FIXED24_FMT);
669}
670
671static const struct file_operations smk_load_ops = {
672 .open = smk_open_load,
673 .read = seq_read,
674 .llseek = seq_lseek,
675 .write = smk_write_load,
676 .release = seq_release,
677};
678
679/**
680 * smk_cipso_doi - initialize the CIPSO domain
681 */
682static void smk_cipso_doi(void)
683{
684 int rc;
685 struct cipso_v4_doi *doip;
686 struct netlbl_audit nai;
687
688 smk_netlabel_audit_set(&nai);
689
690 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
691 if (rc != 0)
692 printk(KERN_WARNING "%s:%d remove rc = %d\n",
693 __func__, __LINE__, rc);
694
695 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL | __GFP_NOFAIL);
696 doip->map.std = NULL;
697 doip->doi = smk_cipso_doi_value;
698 doip->type = CIPSO_V4_MAP_PASS;
699 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
700 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
701 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
702
703 rc = netlbl_cfg_cipsov4_add(doip, &nai);
704 if (rc != 0) {
705 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
706 __func__, __LINE__, rc);
707 kfree(doip);
708 return;
709 }
710 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
711 if (rc != 0) {
712 printk(KERN_WARNING "%s:%d map add rc = %d\n",
713 __func__, __LINE__, rc);
714 netlbl_cfg_cipsov4_del(doip->doi, &nai);
715 return;
716 }
717}
718
719/**
720 * smk_unlbl_ambient - initialize the unlabeled domain
721 * @oldambient: previous domain string
722 */
723static void smk_unlbl_ambient(char *oldambient)
724{
725 int rc;
726 struct netlbl_audit nai;
727
728 smk_netlabel_audit_set(&nai);
729
730 if (oldambient != NULL) {
731 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
732 if (rc != 0)
733 printk(KERN_WARNING "%s:%d remove rc = %d\n",
734 __func__, __LINE__, rc);
735 }
736 if (smack_net_ambient == NULL)
737 smack_net_ambient = &smack_known_floor;
738
739 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
740 NULL, NULL, &nai);
741 if (rc != 0)
742 printk(KERN_WARNING "%s:%d add rc = %d\n",
743 __func__, __LINE__, rc);
744}
745
746/*
747 * Seq_file read operations for /smack/cipso
748 */
749
750static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
751{
752 return smk_seq_start(s, pos, &smack_known_list);
753}
754
755static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
756{
757 return smk_seq_next(s, v, pos, &smack_known_list);
758}
759
760/*
761 * Print cipso labels in format:
762 * label level[/cat[,cat]]
763 */
764static int cipso_seq_show(struct seq_file *s, void *v)
765{
766 struct list_head *list = v;
767 struct smack_known *skp =
768 list_entry_rcu(list, struct smack_known, list);
769 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
770 char sep = '/';
771 int i;
772
773 /*
774 * Don't show a label that could not have been set using
775 * /smack/cipso. This is in support of the notion that
776 * anything read from /smack/cipso ought to be writeable
777 * to /smack/cipso.
778 *
779 * /smack/cipso2 should be used instead.
780 */
781 if (strlen(skp->smk_known) >= SMK_LABELLEN)
782 return 0;
783
784 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
785
786 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
787 i = netlbl_catmap_walk(cmp, i + 1)) {
788 seq_printf(s, "%c%d", sep, i);
789 sep = ',';
790 }
791
792 seq_putc(s, '\n');
793
794 return 0;
795}
796
797static const struct seq_operations cipso_seq_ops = {
798 .start = cipso_seq_start,
799 .next = cipso_seq_next,
800 .show = cipso_seq_show,
801 .stop = smk_seq_stop,
802};
803
804/**
805 * smk_open_cipso - open() for /smack/cipso
806 * @inode: inode structure representing file
807 * @file: "cipso" file pointer
808 *
809 * Connect our cipso_seq_* operations with /smack/cipso
810 * file_operations
811 */
812static int smk_open_cipso(struct inode *inode, struct file *file)
813{
814 return seq_open(file, &cipso_seq_ops);
815}
816
817/**
818 * smk_set_cipso - do the work for write() for cipso and cipso2
819 * @file: file pointer, not actually used
820 * @buf: where to get the data from
821 * @count: bytes sent
822 * @ppos: where to start
823 * @format: /smack/cipso or /smack/cipso2
824 *
825 * Accepts only one cipso rule per write call.
826 * Returns number of bytes written or error code, as appropriate
827 */
828static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
829 size_t count, loff_t *ppos, int format)
830{
831 struct netlbl_lsm_catmap *old_cat, *new_cat = NULL;
832 struct smack_known *skp;
833 struct netlbl_lsm_secattr ncats;
834 char mapcatset[SMK_CIPSOLEN];
835 int maplevel;
836 unsigned int cat;
837 int catlen;
838 ssize_t rc = -EINVAL;
839 char *data = NULL;
840 char *rule;
841 int ret;
842 int i;
843
844 /*
845 * Must have privilege.
846 * No partial writes.
847 * Enough data must be present.
848 */
849 if (!smack_privileged(CAP_MAC_ADMIN))
850 return -EPERM;
851 if (*ppos != 0)
852 return -EINVAL;
853 if (format == SMK_FIXED24_FMT &&
854 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
855 return -EINVAL;
856 if (count > PAGE_SIZE)
857 return -EINVAL;
858
859 data = memdup_user_nul(buf, count);
860 if (IS_ERR(data))
861 return PTR_ERR(data);
862
863 rule = data;
864 /*
865 * Only allow one writer at a time. Writes should be
866 * quite rare and small in any case.
867 */
868 mutex_lock(&smack_cipso_lock);
869
870 skp = smk_import_entry(rule, 0);
871 if (IS_ERR(skp)) {
872 rc = PTR_ERR(skp);
873 goto out;
874 }
875
876 if (format == SMK_FIXED24_FMT)
877 rule += SMK_LABELLEN;
878 else
879 rule += strlen(skp->smk_known) + 1;
880
881 if (rule > data + count) {
882 rc = -EOVERFLOW;
883 goto out;
884 }
885
886 ret = sscanf(rule, "%d", &maplevel);
887 if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL)
888 goto out;
889
890 rule += SMK_DIGITLEN;
891 if (rule > data + count) {
892 rc = -EOVERFLOW;
893 goto out;
894 }
895
896 ret = sscanf(rule, "%d", &catlen);
897 if (ret != 1 || catlen < 0 || catlen > SMACK_CIPSO_MAXCATNUM)
898 goto out;
899
900 if (format == SMK_FIXED24_FMT &&
901 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
902 goto out;
903
904 memset(mapcatset, 0, sizeof(mapcatset));
905
906 for (i = 0; i < catlen; i++) {
907 rule += SMK_DIGITLEN;
908 if (rule > data + count) {
909 rc = -EOVERFLOW;
910 goto out;
911 }
912 ret = sscanf(rule, "%u", &cat);
913 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
914 goto out;
915
916 smack_catset_bit(cat, mapcatset);
917 }
918 ncats.flags = 0;
919 if (catlen == 0) {
920 ncats.attr.mls.cat = NULL;
921 ncats.attr.mls.lvl = maplevel;
922 new_cat = netlbl_catmap_alloc(GFP_ATOMIC);
923 if (new_cat)
924 new_cat->next = ncats.attr.mls.cat;
925 ncats.attr.mls.cat = new_cat;
926 skp->smk_netlabel.flags &= ~(1U << 3);
927 rc = 0;
928 } else {
929 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
930 }
931 if (rc >= 0) {
932 old_cat = skp->smk_netlabel.attr.mls.cat;
933 rcu_assign_pointer(skp->smk_netlabel.attr.mls.cat, ncats.attr.mls.cat);
934 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
935 synchronize_rcu();
936 netlbl_catmap_free(old_cat);
937 rc = count;
938 /*
939 * This mapping may have been cached, so clear the cache.
940 */
941 netlbl_cache_invalidate();
942 }
943
944out:
945 mutex_unlock(&smack_cipso_lock);
946 kfree(data);
947 return rc;
948}
949
950/**
951 * smk_write_cipso - write() for /smack/cipso
952 * @file: file pointer, not actually used
953 * @buf: where to get the data from
954 * @count: bytes sent
955 * @ppos: where to start
956 *
957 * Accepts only one cipso rule per write call.
958 * Returns number of bytes written or error code, as appropriate
959 */
960static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
961 size_t count, loff_t *ppos)
962{
963 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
964}
965
966static const struct file_operations smk_cipso_ops = {
967 .open = smk_open_cipso,
968 .read = seq_read,
969 .llseek = seq_lseek,
970 .write = smk_write_cipso,
971 .release = seq_release,
972};
973
974/*
975 * Seq_file read operations for /smack/cipso2
976 */
977
978/*
979 * Print cipso labels in format:
980 * label level[/cat[,cat]]
981 */
982static int cipso2_seq_show(struct seq_file *s, void *v)
983{
984 struct list_head *list = v;
985 struct smack_known *skp =
986 list_entry_rcu(list, struct smack_known, list);
987 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
988 char sep = '/';
989 int i;
990
991 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
992
993 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
994 i = netlbl_catmap_walk(cmp, i + 1)) {
995 seq_printf(s, "%c%d", sep, i);
996 sep = ',';
997 }
998
999 seq_putc(s, '\n');
1000
1001 return 0;
1002}
1003
1004static const struct seq_operations cipso2_seq_ops = {
1005 .start = cipso_seq_start,
1006 .next = cipso_seq_next,
1007 .show = cipso2_seq_show,
1008 .stop = smk_seq_stop,
1009};
1010
1011/**
1012 * smk_open_cipso2 - open() for /smack/cipso2
1013 * @inode: inode structure representing file
1014 * @file: "cipso2" file pointer
1015 *
1016 * Connect our cipso_seq_* operations with /smack/cipso2
1017 * file_operations
1018 */
1019static int smk_open_cipso2(struct inode *inode, struct file *file)
1020{
1021 return seq_open(file, &cipso2_seq_ops);
1022}
1023
1024/**
1025 * smk_write_cipso2 - write() for /smack/cipso2
1026 * @file: file pointer, not actually used
1027 * @buf: where to get the data from
1028 * @count: bytes sent
1029 * @ppos: where to start
1030 *
1031 * Accepts only one cipso rule per write call.
1032 * Returns number of bytes written or error code, as appropriate
1033 */
1034static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1035 size_t count, loff_t *ppos)
1036{
1037 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1038}
1039
1040static const struct file_operations smk_cipso2_ops = {
1041 .open = smk_open_cipso2,
1042 .read = seq_read,
1043 .llseek = seq_lseek,
1044 .write = smk_write_cipso2,
1045 .release = seq_release,
1046};
1047
1048/*
1049 * Seq_file read operations for /smack/netlabel
1050 */
1051
1052static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1053{
1054 return smk_seq_start(s, pos, &smk_net4addr_list);
1055}
1056
1057static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1058{
1059 return smk_seq_next(s, v, pos, &smk_net4addr_list);
1060}
1061
1062/*
1063 * Print host/label pairs
1064 */
1065static int net4addr_seq_show(struct seq_file *s, void *v)
1066{
1067 struct list_head *list = v;
1068 struct smk_net4addr *skp =
1069 list_entry_rcu(list, struct smk_net4addr, list);
1070 char *kp = SMACK_CIPSO_OPTION;
1071
1072 if (skp->smk_label != NULL)
1073 kp = skp->smk_label->smk_known;
1074 seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1075 skp->smk_masks, kp);
1076
1077 return 0;
1078}
1079
1080static const struct seq_operations net4addr_seq_ops = {
1081 .start = net4addr_seq_start,
1082 .next = net4addr_seq_next,
1083 .show = net4addr_seq_show,
1084 .stop = smk_seq_stop,
1085};
1086
1087/**
1088 * smk_open_net4addr - open() for /smack/netlabel
1089 * @inode: inode structure representing file
1090 * @file: "netlabel" file pointer
1091 *
1092 * Connect our net4addr_seq_* operations with /smack/netlabel
1093 * file_operations
1094 */
1095static int smk_open_net4addr(struct inode *inode, struct file *file)
1096{
1097 return seq_open(file, &net4addr_seq_ops);
1098}
1099
1100/**
1101 * smk_net4addr_insert
1102 * @new : netlabel to insert
1103 *
1104 * This helper insert netlabel in the smack_net4addrs list
1105 * sorted by netmask length (longest to smallest)
1106 * locked by &smk_net4addr_lock in smk_write_net4addr
1107 *
1108 */
1109static void smk_net4addr_insert(struct smk_net4addr *new)
1110{
1111 struct smk_net4addr *m;
1112 struct smk_net4addr *m_next;
1113
1114 if (list_empty(&smk_net4addr_list)) {
1115 list_add_rcu(&new->list, &smk_net4addr_list);
1116 return;
1117 }
1118
1119 m = list_entry_rcu(smk_net4addr_list.next,
1120 struct smk_net4addr, list);
1121
1122 /* the comparison '>' is a bit hacky, but works */
1123 if (new->smk_masks > m->smk_masks) {
1124 list_add_rcu(&new->list, &smk_net4addr_list);
1125 return;
1126 }
1127
1128 list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1129 if (list_is_last(&m->list, &smk_net4addr_list)) {
1130 list_add_rcu(&new->list, &m->list);
1131 return;
1132 }
1133 m_next = list_entry_rcu(m->list.next,
1134 struct smk_net4addr, list);
1135 if (new->smk_masks > m_next->smk_masks) {
1136 list_add_rcu(&new->list, &m->list);
1137 return;
1138 }
1139 }
1140}
1141
1142
1143/**
1144 * smk_write_net4addr - write() for /smack/netlabel
1145 * @file: file pointer, not actually used
1146 * @buf: where to get the data from
1147 * @count: bytes sent
1148 * @ppos: where to start
1149 *
1150 * Accepts only one net4addr per write call.
1151 * Returns number of bytes written or error code, as appropriate
1152 */
1153static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1154 size_t count, loff_t *ppos)
1155{
1156 struct smk_net4addr *snp;
1157 struct sockaddr_in newname;
1158 char *smack;
1159 struct smack_known *skp = NULL;
1160 char *data;
1161 char *host = (char *)&newname.sin_addr.s_addr;
1162 int rc;
1163 struct netlbl_audit audit_info;
1164 struct in_addr mask;
1165 unsigned int m;
1166 unsigned int masks;
1167 int found;
1168 u32 mask_bits = (1<<31);
1169 __be32 nsa;
1170 u32 temp_mask;
1171
1172 /*
1173 * Must have privilege.
1174 * No partial writes.
1175 * Enough data must be present.
1176 * "<addr/mask, as a.b.c.d/e><space><label>"
1177 * "<addr, as a.b.c.d><space><label>"
1178 */
1179 if (!smack_privileged(CAP_MAC_ADMIN))
1180 return -EPERM;
1181 if (*ppos != 0)
1182 return -EINVAL;
1183 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1184 return -EINVAL;
1185
1186 data = memdup_user_nul(buf, count);
1187 if (IS_ERR(data))
1188 return PTR_ERR(data);
1189
1190 smack = kzalloc(count + 1, GFP_KERNEL);
1191 if (smack == NULL) {
1192 rc = -ENOMEM;
1193 goto free_data_out;
1194 }
1195
1196 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1197 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1198 if (rc != 6) {
1199 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1200 &host[0], &host[1], &host[2], &host[3], smack);
1201 if (rc != 5) {
1202 rc = -EINVAL;
1203 goto free_out;
1204 }
1205 masks = 32;
1206 }
1207 if (masks > BEBITS) {
1208 rc = -EINVAL;
1209 goto free_out;
1210 }
1211
1212 /*
1213 * If smack begins with '-', it is an option, don't import it
1214 */
1215 if (smack[0] != '-') {
1216 skp = smk_import_entry(smack, 0);
1217 if (IS_ERR(skp)) {
1218 rc = PTR_ERR(skp);
1219 goto free_out;
1220 }
1221 } else {
1222 /*
1223 * Only the -CIPSO option is supported for IPv4
1224 */
1225 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1226 rc = -EINVAL;
1227 goto free_out;
1228 }
1229 }
1230
1231 for (m = masks, temp_mask = 0; m > 0; m--) {
1232 temp_mask |= mask_bits;
1233 mask_bits >>= 1;
1234 }
1235 mask.s_addr = cpu_to_be32(temp_mask);
1236
1237 newname.sin_addr.s_addr &= mask.s_addr;
1238 /*
1239 * Only allow one writer at a time. Writes should be
1240 * quite rare and small in any case.
1241 */
1242 mutex_lock(&smk_net4addr_lock);
1243
1244 nsa = newname.sin_addr.s_addr;
1245 /* try to find if the prefix is already in the list */
1246 found = 0;
1247 list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1248 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1249 found = 1;
1250 break;
1251 }
1252 }
1253 smk_netlabel_audit_set(&audit_info);
1254
1255 if (found == 0) {
1256 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1257 if (snp == NULL)
1258 rc = -ENOMEM;
1259 else {
1260 rc = 0;
1261 snp->smk_host.s_addr = newname.sin_addr.s_addr;
1262 snp->smk_mask.s_addr = mask.s_addr;
1263 snp->smk_label = skp;
1264 snp->smk_masks = masks;
1265 smk_net4addr_insert(snp);
1266 }
1267 } else {
1268 /*
1269 * Delete the unlabeled entry, only if the previous label
1270 * wasn't the special CIPSO option
1271 */
1272 if (snp->smk_label != NULL)
1273 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1274 &snp->smk_host, &snp->smk_mask,
1275 PF_INET, &audit_info);
1276 else
1277 rc = 0;
1278 snp->smk_label = skp;
1279 }
1280
1281 /*
1282 * Now tell netlabel about the single label nature of
1283 * this host so that incoming packets get labeled.
1284 * but only if we didn't get the special CIPSO option
1285 */
1286 if (rc == 0 && skp != NULL)
1287 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1288 &snp->smk_host, &snp->smk_mask, PF_INET,
1289 snp->smk_label->smk_secid, &audit_info);
1290
1291 if (rc == 0)
1292 rc = count;
1293
1294 mutex_unlock(&smk_net4addr_lock);
1295
1296free_out:
1297 kfree(smack);
1298free_data_out:
1299 kfree(data);
1300
1301 return rc;
1302}
1303
1304static const struct file_operations smk_net4addr_ops = {
1305 .open = smk_open_net4addr,
1306 .read = seq_read,
1307 .llseek = seq_lseek,
1308 .write = smk_write_net4addr,
1309 .release = seq_release,
1310};
1311
1312#if IS_ENABLED(CONFIG_IPV6)
1313/*
1314 * Seq_file read operations for /smack/netlabel6
1315 */
1316
1317static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1318{
1319 return smk_seq_start(s, pos, &smk_net6addr_list);
1320}
1321
1322static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1323{
1324 return smk_seq_next(s, v, pos, &smk_net6addr_list);
1325}
1326
1327/*
1328 * Print host/label pairs
1329 */
1330static int net6addr_seq_show(struct seq_file *s, void *v)
1331{
1332 struct list_head *list = v;
1333 struct smk_net6addr *skp =
1334 list_entry(list, struct smk_net6addr, list);
1335
1336 if (skp->smk_label != NULL)
1337 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1338 skp->smk_label->smk_known);
1339
1340 return 0;
1341}
1342
1343static const struct seq_operations net6addr_seq_ops = {
1344 .start = net6addr_seq_start,
1345 .next = net6addr_seq_next,
1346 .show = net6addr_seq_show,
1347 .stop = smk_seq_stop,
1348};
1349
1350/**
1351 * smk_open_net6addr - open() for /smack/netlabel
1352 * @inode: inode structure representing file
1353 * @file: "netlabel" file pointer
1354 *
1355 * Connect our net6addr_seq_* operations with /smack/netlabel
1356 * file_operations
1357 */
1358static int smk_open_net6addr(struct inode *inode, struct file *file)
1359{
1360 return seq_open(file, &net6addr_seq_ops);
1361}
1362
1363/**
1364 * smk_net6addr_insert
1365 * @new : entry to insert
1366 *
1367 * This inserts an entry in the smack_net6addrs list
1368 * sorted by netmask length (longest to smallest)
1369 * locked by &smk_net6addr_lock in smk_write_net6addr
1370 *
1371 */
1372static void smk_net6addr_insert(struct smk_net6addr *new)
1373{
1374 struct smk_net6addr *m_next;
1375 struct smk_net6addr *m;
1376
1377 if (list_empty(&smk_net6addr_list)) {
1378 list_add_rcu(&new->list, &smk_net6addr_list);
1379 return;
1380 }
1381
1382 m = list_entry_rcu(smk_net6addr_list.next,
1383 struct smk_net6addr, list);
1384
1385 if (new->smk_masks > m->smk_masks) {
1386 list_add_rcu(&new->list, &smk_net6addr_list);
1387 return;
1388 }
1389
1390 list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1391 if (list_is_last(&m->list, &smk_net6addr_list)) {
1392 list_add_rcu(&new->list, &m->list);
1393 return;
1394 }
1395 m_next = list_entry_rcu(m->list.next,
1396 struct smk_net6addr, list);
1397 if (new->smk_masks > m_next->smk_masks) {
1398 list_add_rcu(&new->list, &m->list);
1399 return;
1400 }
1401 }
1402}
1403
1404
1405/**
1406 * smk_write_net6addr - write() for /smack/netlabel
1407 * @file: file pointer, not actually used
1408 * @buf: where to get the data from
1409 * @count: bytes sent
1410 * @ppos: where to start
1411 *
1412 * Accepts only one net6addr per write call.
1413 * Returns number of bytes written or error code, as appropriate
1414 */
1415static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1416 size_t count, loff_t *ppos)
1417{
1418 struct smk_net6addr *snp;
1419 struct in6_addr newname;
1420 struct in6_addr fullmask;
1421 struct smack_known *skp = NULL;
1422 char *smack;
1423 char *data;
1424 int rc = 0;
1425 int found = 0;
1426 int i;
1427 unsigned int scanned[8];
1428 unsigned int m;
1429 unsigned int mask = 128;
1430
1431 /*
1432 * Must have privilege.
1433 * No partial writes.
1434 * Enough data must be present.
1435 * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1436 * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1437 */
1438 if (!smack_privileged(CAP_MAC_ADMIN))
1439 return -EPERM;
1440 if (*ppos != 0)
1441 return -EINVAL;
1442 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1443 return -EINVAL;
1444
1445 data = memdup_user_nul(buf, count);
1446 if (IS_ERR(data))
1447 return PTR_ERR(data);
1448
1449 smack = kzalloc(count + 1, GFP_KERNEL);
1450 if (smack == NULL) {
1451 rc = -ENOMEM;
1452 goto free_data_out;
1453 }
1454
1455 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1456 &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1457 &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1458 &mask, smack);
1459 if (i != 10) {
1460 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1461 &scanned[0], &scanned[1], &scanned[2],
1462 &scanned[3], &scanned[4], &scanned[5],
1463 &scanned[6], &scanned[7], smack);
1464 if (i != 9) {
1465 rc = -EINVAL;
1466 goto free_out;
1467 }
1468 }
1469 if (mask > 128) {
1470 rc = -EINVAL;
1471 goto free_out;
1472 }
1473 for (i = 0; i < 8; i++) {
1474 if (scanned[i] > 0xffff) {
1475 rc = -EINVAL;
1476 goto free_out;
1477 }
1478 newname.s6_addr16[i] = htons(scanned[i]);
1479 }
1480
1481 /*
1482 * If smack begins with '-', it is an option, don't import it
1483 */
1484 if (smack[0] != '-') {
1485 skp = smk_import_entry(smack, 0);
1486 if (IS_ERR(skp)) {
1487 rc = PTR_ERR(skp);
1488 goto free_out;
1489 }
1490 } else {
1491 /*
1492 * Only -DELETE is supported for IPv6
1493 */
1494 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1495 rc = -EINVAL;
1496 goto free_out;
1497 }
1498 }
1499
1500 for (i = 0, m = mask; i < 8; i++) {
1501 if (m >= 16) {
1502 fullmask.s6_addr16[i] = 0xffff;
1503 m -= 16;
1504 } else if (m > 0) {
1505 fullmask.s6_addr16[i] = (1 << m) - 1;
1506 m = 0;
1507 } else
1508 fullmask.s6_addr16[i] = 0;
1509 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1510 }
1511
1512 /*
1513 * Only allow one writer at a time. Writes should be
1514 * quite rare and small in any case.
1515 */
1516 mutex_lock(&smk_net6addr_lock);
1517 /*
1518 * Try to find the prefix in the list
1519 */
1520 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1521 if (mask != snp->smk_masks)
1522 continue;
1523 for (found = 1, i = 0; i < 8; i++) {
1524 if (newname.s6_addr16[i] !=
1525 snp->smk_host.s6_addr16[i]) {
1526 found = 0;
1527 break;
1528 }
1529 }
1530 if (found == 1)
1531 break;
1532 }
1533 if (found == 0) {
1534 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1535 if (snp == NULL)
1536 rc = -ENOMEM;
1537 else {
1538 snp->smk_host = newname;
1539 snp->smk_mask = fullmask;
1540 snp->smk_masks = mask;
1541 snp->smk_label = skp;
1542 smk_net6addr_insert(snp);
1543 }
1544 } else {
1545 snp->smk_label = skp;
1546 }
1547
1548 if (rc == 0)
1549 rc = count;
1550
1551 mutex_unlock(&smk_net6addr_lock);
1552
1553free_out:
1554 kfree(smack);
1555free_data_out:
1556 kfree(data);
1557
1558 return rc;
1559}
1560
1561static const struct file_operations smk_net6addr_ops = {
1562 .open = smk_open_net6addr,
1563 .read = seq_read,
1564 .llseek = seq_lseek,
1565 .write = smk_write_net6addr,
1566 .release = seq_release,
1567};
1568#endif /* CONFIG_IPV6 */
1569
1570/**
1571 * smk_read_doi - read() for /smack/doi
1572 * @filp: file pointer, not actually used
1573 * @buf: where to put the result
1574 * @count: maximum to send along
1575 * @ppos: where to start
1576 *
1577 * Returns number of bytes read or error code, as appropriate
1578 */
1579static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1580 size_t count, loff_t *ppos)
1581{
1582 char temp[80];
1583 ssize_t rc;
1584
1585 if (*ppos != 0)
1586 return 0;
1587
1588 sprintf(temp, "%d", smk_cipso_doi_value);
1589 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1590
1591 return rc;
1592}
1593
1594/**
1595 * smk_write_doi - write() for /smack/doi
1596 * @file: file pointer, not actually used
1597 * @buf: where to get the data from
1598 * @count: bytes sent
1599 * @ppos: where to start
1600 *
1601 * Returns number of bytes written or error code, as appropriate
1602 */
1603static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1604 size_t count, loff_t *ppos)
1605{
1606 char temp[80];
1607 int i;
1608
1609 if (!smack_privileged(CAP_MAC_ADMIN))
1610 return -EPERM;
1611
1612 if (count >= sizeof(temp) || count == 0)
1613 return -EINVAL;
1614
1615 if (copy_from_user(temp, buf, count) != 0)
1616 return -EFAULT;
1617
1618 temp[count] = '\0';
1619
1620 if (sscanf(temp, "%d", &i) != 1)
1621 return -EINVAL;
1622
1623 smk_cipso_doi_value = i;
1624
1625 smk_cipso_doi();
1626
1627 return count;
1628}
1629
1630static const struct file_operations smk_doi_ops = {
1631 .read = smk_read_doi,
1632 .write = smk_write_doi,
1633 .llseek = default_llseek,
1634};
1635
1636/**
1637 * smk_read_direct - read() for /smack/direct
1638 * @filp: file pointer, not actually used
1639 * @buf: where to put the result
1640 * @count: maximum to send along
1641 * @ppos: where to start
1642 *
1643 * Returns number of bytes read or error code, as appropriate
1644 */
1645static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1646 size_t count, loff_t *ppos)
1647{
1648 char temp[80];
1649 ssize_t rc;
1650
1651 if (*ppos != 0)
1652 return 0;
1653
1654 sprintf(temp, "%d", smack_cipso_direct);
1655 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1656
1657 return rc;
1658}
1659
1660/**
1661 * smk_write_direct - write() for /smack/direct
1662 * @file: file pointer, not actually used
1663 * @buf: where to get the data from
1664 * @count: bytes sent
1665 * @ppos: where to start
1666 *
1667 * Returns number of bytes written or error code, as appropriate
1668 */
1669static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1670 size_t count, loff_t *ppos)
1671{
1672 struct smack_known *skp;
1673 char temp[80];
1674 int i;
1675
1676 if (!smack_privileged(CAP_MAC_ADMIN))
1677 return -EPERM;
1678
1679 if (count >= sizeof(temp) || count == 0)
1680 return -EINVAL;
1681
1682 if (copy_from_user(temp, buf, count) != 0)
1683 return -EFAULT;
1684
1685 temp[count] = '\0';
1686
1687 if (sscanf(temp, "%d", &i) != 1)
1688 return -EINVAL;
1689
1690 /*
1691 * Don't do anything if the value hasn't actually changed.
1692 * If it is changing reset the level on entries that were
1693 * set up to be direct when they were created.
1694 */
1695 if (smack_cipso_direct != i) {
1696 mutex_lock(&smack_known_lock);
1697 list_for_each_entry_rcu(skp, &smack_known_list, list)
1698 if (skp->smk_netlabel.attr.mls.lvl ==
1699 smack_cipso_direct)
1700 skp->smk_netlabel.attr.mls.lvl = i;
1701 smack_cipso_direct = i;
1702 mutex_unlock(&smack_known_lock);
1703 }
1704
1705 return count;
1706}
1707
1708static const struct file_operations smk_direct_ops = {
1709 .read = smk_read_direct,
1710 .write = smk_write_direct,
1711 .llseek = default_llseek,
1712};
1713
1714/**
1715 * smk_read_mapped - read() for /smack/mapped
1716 * @filp: file pointer, not actually used
1717 * @buf: where to put the result
1718 * @count: maximum to send along
1719 * @ppos: where to start
1720 *
1721 * Returns number of bytes read or error code, as appropriate
1722 */
1723static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1724 size_t count, loff_t *ppos)
1725{
1726 char temp[80];
1727 ssize_t rc;
1728
1729 if (*ppos != 0)
1730 return 0;
1731
1732 sprintf(temp, "%d", smack_cipso_mapped);
1733 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1734
1735 return rc;
1736}
1737
1738/**
1739 * smk_write_mapped - write() for /smack/mapped
1740 * @file: file pointer, not actually used
1741 * @buf: where to get the data from
1742 * @count: bytes sent
1743 * @ppos: where to start
1744 *
1745 * Returns number of bytes written or error code, as appropriate
1746 */
1747static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1748 size_t count, loff_t *ppos)
1749{
1750 struct smack_known *skp;
1751 char temp[80];
1752 int i;
1753
1754 if (!smack_privileged(CAP_MAC_ADMIN))
1755 return -EPERM;
1756
1757 if (count >= sizeof(temp) || count == 0)
1758 return -EINVAL;
1759
1760 if (copy_from_user(temp, buf, count) != 0)
1761 return -EFAULT;
1762
1763 temp[count] = '\0';
1764
1765 if (sscanf(temp, "%d", &i) != 1)
1766 return -EINVAL;
1767
1768 /*
1769 * Don't do anything if the value hasn't actually changed.
1770 * If it is changing reset the level on entries that were
1771 * set up to be mapped when they were created.
1772 */
1773 if (smack_cipso_mapped != i) {
1774 mutex_lock(&smack_known_lock);
1775 list_for_each_entry_rcu(skp, &smack_known_list, list)
1776 if (skp->smk_netlabel.attr.mls.lvl ==
1777 smack_cipso_mapped)
1778 skp->smk_netlabel.attr.mls.lvl = i;
1779 smack_cipso_mapped = i;
1780 mutex_unlock(&smack_known_lock);
1781 }
1782
1783 return count;
1784}
1785
1786static const struct file_operations smk_mapped_ops = {
1787 .read = smk_read_mapped,
1788 .write = smk_write_mapped,
1789 .llseek = default_llseek,
1790};
1791
1792/**
1793 * smk_read_ambient - read() for /smack/ambient
1794 * @filp: file pointer, not actually used
1795 * @buf: where to put the result
1796 * @cn: maximum to send along
1797 * @ppos: where to start
1798 *
1799 * Returns number of bytes read or error code, as appropriate
1800 */
1801static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1802 size_t cn, loff_t *ppos)
1803{
1804 ssize_t rc;
1805 int asize;
1806
1807 if (*ppos != 0)
1808 return 0;
1809 /*
1810 * Being careful to avoid a problem in the case where
1811 * smack_net_ambient gets changed in midstream.
1812 */
1813 mutex_lock(&smack_ambient_lock);
1814
1815 asize = strlen(smack_net_ambient->smk_known) + 1;
1816
1817 if (cn >= asize)
1818 rc = simple_read_from_buffer(buf, cn, ppos,
1819 smack_net_ambient->smk_known,
1820 asize);
1821 else
1822 rc = -EINVAL;
1823
1824 mutex_unlock(&smack_ambient_lock);
1825
1826 return rc;
1827}
1828
1829/**
1830 * smk_write_ambient - write() for /smack/ambient
1831 * @file: file pointer, not actually used
1832 * @buf: where to get the data from
1833 * @count: bytes sent
1834 * @ppos: where to start
1835 *
1836 * Returns number of bytes written or error code, as appropriate
1837 */
1838static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1839 size_t count, loff_t *ppos)
1840{
1841 struct smack_known *skp;
1842 char *oldambient;
1843 char *data;
1844 int rc = count;
1845
1846 if (!smack_privileged(CAP_MAC_ADMIN))
1847 return -EPERM;
1848
1849 /* Enough data must be present */
1850 if (count == 0 || count > PAGE_SIZE)
1851 return -EINVAL;
1852
1853 data = memdup_user_nul(buf, count);
1854 if (IS_ERR(data))
1855 return PTR_ERR(data);
1856
1857 skp = smk_import_entry(data, count);
1858 if (IS_ERR(skp)) {
1859 rc = PTR_ERR(skp);
1860 goto out;
1861 }
1862
1863 mutex_lock(&smack_ambient_lock);
1864
1865 oldambient = smack_net_ambient->smk_known;
1866 smack_net_ambient = skp;
1867 smk_unlbl_ambient(oldambient);
1868
1869 mutex_unlock(&smack_ambient_lock);
1870
1871out:
1872 kfree(data);
1873 return rc;
1874}
1875
1876static const struct file_operations smk_ambient_ops = {
1877 .read = smk_read_ambient,
1878 .write = smk_write_ambient,
1879 .llseek = default_llseek,
1880};
1881
1882/*
1883 * Seq_file operations for /smack/onlycap
1884 */
1885static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1886{
1887 return smk_seq_start(s, pos, &smack_onlycap_list);
1888}
1889
1890static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1891{
1892 return smk_seq_next(s, v, pos, &smack_onlycap_list);
1893}
1894
1895static int onlycap_seq_show(struct seq_file *s, void *v)
1896{
1897 struct list_head *list = v;
1898 struct smack_known_list_elem *sklep =
1899 list_entry_rcu(list, struct smack_known_list_elem, list);
1900
1901 seq_puts(s, sklep->smk_label->smk_known);
1902 seq_putc(s, ' ');
1903
1904 return 0;
1905}
1906
1907static const struct seq_operations onlycap_seq_ops = {
1908 .start = onlycap_seq_start,
1909 .next = onlycap_seq_next,
1910 .show = onlycap_seq_show,
1911 .stop = smk_seq_stop,
1912};
1913
1914static int smk_open_onlycap(struct inode *inode, struct file *file)
1915{
1916 return seq_open(file, &onlycap_seq_ops);
1917}
1918
1919/**
1920 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1921 * The caller must hold appropriate mutex to prevent concurrent modifications
1922 * to the public list.
1923 * Private list is assumed to be not accessible to other threads yet.
1924 *
1925 * @public: public list
1926 * @private: private list
1927 */
1928static void smk_list_swap_rcu(struct list_head *public,
1929 struct list_head *private)
1930{
1931 struct list_head *first, *last;
1932
1933 if (list_empty(public)) {
1934 list_splice_init_rcu(private, public, synchronize_rcu);
1935 } else {
1936 /* Remember public list before replacing it */
1937 first = public->next;
1938 last = public->prev;
1939
1940 /* Publish private list in place of public in RCU-safe way */
1941 private->prev->next = public;
1942 private->next->prev = public;
1943 rcu_assign_pointer(public->next, private->next);
1944 public->prev = private->prev;
1945
1946 synchronize_rcu();
1947
1948 /* When all readers are done with the old public list,
1949 * attach it in place of private */
1950 private->next = first;
1951 private->prev = last;
1952 first->prev = private;
1953 last->next = private;
1954 }
1955}
1956
1957/**
1958 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1959 *
1960 * @data: the string to parse
1961 * @list: destination list
1962 *
1963 * Returns zero on success or error code, as appropriate
1964 */
1965static int smk_parse_label_list(char *data, struct list_head *list)
1966{
1967 char *tok;
1968 struct smack_known *skp;
1969 struct smack_known_list_elem *sklep;
1970
1971 while ((tok = strsep(&data, " ")) != NULL) {
1972 if (!*tok)
1973 continue;
1974
1975 skp = smk_import_entry(tok, 0);
1976 if (IS_ERR(skp))
1977 return PTR_ERR(skp);
1978
1979 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1980 if (sklep == NULL)
1981 return -ENOMEM;
1982
1983 sklep->smk_label = skp;
1984 list_add(&sklep->list, list);
1985 }
1986
1987 return 0;
1988}
1989
1990/**
1991 * smk_destroy_label_list - destroy a list of smack_known_list_elem
1992 * @list: header pointer of the list to destroy
1993 */
1994void smk_destroy_label_list(struct list_head *list)
1995{
1996 struct smack_known_list_elem *sklep;
1997 struct smack_known_list_elem *sklep2;
1998
1999 list_for_each_entry_safe(sklep, sklep2, list, list)
2000 kfree(sklep);
2001
2002 INIT_LIST_HEAD(list);
2003}
2004
2005/**
2006 * smk_write_onlycap - write() for smackfs/onlycap
2007 * @file: file pointer, not actually used
2008 * @buf: where to get the data from
2009 * @count: bytes sent
2010 * @ppos: where to start
2011 *
2012 * Returns number of bytes written or error code, as appropriate
2013 */
2014static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
2015 size_t count, loff_t *ppos)
2016{
2017 char *data;
2018 LIST_HEAD(list_tmp);
2019 int rc;
2020
2021 if (!smack_privileged(CAP_MAC_ADMIN))
2022 return -EPERM;
2023
2024 if (count > PAGE_SIZE)
2025 return -EINVAL;
2026
2027 data = memdup_user_nul(buf, count);
2028 if (IS_ERR(data))
2029 return PTR_ERR(data);
2030
2031 rc = smk_parse_label_list(data, &list_tmp);
2032 kfree(data);
2033
2034 /*
2035 * Clear the smack_onlycap on invalid label errors. This means
2036 * that we can pass a null string to unset the onlycap value.
2037 *
2038 * Importing will also reject a label beginning with '-',
2039 * so "-usecapabilities" will also work.
2040 *
2041 * But do so only on invalid label, not on system errors.
2042 * The invalid label must be first to count as clearing attempt.
2043 */
2044 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2045 mutex_lock(&smack_onlycap_lock);
2046 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2047 mutex_unlock(&smack_onlycap_lock);
2048 rc = count;
2049 }
2050
2051 smk_destroy_label_list(&list_tmp);
2052
2053 return rc;
2054}
2055
2056static const struct file_operations smk_onlycap_ops = {
2057 .open = smk_open_onlycap,
2058 .read = seq_read,
2059 .write = smk_write_onlycap,
2060 .llseek = seq_lseek,
2061 .release = seq_release,
2062};
2063
2064#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2065/**
2066 * smk_read_unconfined - read() for smackfs/unconfined
2067 * @filp: file pointer, not actually used
2068 * @buf: where to put the result
2069 * @cn: maximum to send along
2070 * @ppos: where to start
2071 *
2072 * Returns number of bytes read or error code, as appropriate
2073 */
2074static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2075 size_t cn, loff_t *ppos)
2076{
2077 char *smack = "";
2078 ssize_t rc = -EINVAL;
2079 int asize;
2080
2081 if (*ppos != 0)
2082 return 0;
2083
2084 if (smack_unconfined != NULL)
2085 smack = smack_unconfined->smk_known;
2086
2087 asize = strlen(smack) + 1;
2088
2089 if (cn >= asize)
2090 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2091
2092 return rc;
2093}
2094
2095/**
2096 * smk_write_unconfined - write() for smackfs/unconfined
2097 * @file: file pointer, not actually used
2098 * @buf: where to get the data from
2099 * @count: bytes sent
2100 * @ppos: where to start
2101 *
2102 * Returns number of bytes written or error code, as appropriate
2103 */
2104static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2105 size_t count, loff_t *ppos)
2106{
2107 char *data;
2108 struct smack_known *skp;
2109 int rc = count;
2110
2111 if (!smack_privileged(CAP_MAC_ADMIN))
2112 return -EPERM;
2113
2114 if (count > PAGE_SIZE)
2115 return -EINVAL;
2116
2117 data = memdup_user_nul(buf, count);
2118 if (IS_ERR(data))
2119 return PTR_ERR(data);
2120
2121 /*
2122 * Clear the smack_unconfined on invalid label errors. This means
2123 * that we can pass a null string to unset the unconfined value.
2124 *
2125 * Importing will also reject a label beginning with '-',
2126 * so "-confine" will also work.
2127 *
2128 * But do so only on invalid label, not on system errors.
2129 */
2130 skp = smk_import_entry(data, count);
2131 if (PTR_ERR(skp) == -EINVAL)
2132 skp = NULL;
2133 else if (IS_ERR(skp)) {
2134 rc = PTR_ERR(skp);
2135 goto freeout;
2136 }
2137
2138 smack_unconfined = skp;
2139
2140freeout:
2141 kfree(data);
2142 return rc;
2143}
2144
2145static const struct file_operations smk_unconfined_ops = {
2146 .read = smk_read_unconfined,
2147 .write = smk_write_unconfined,
2148 .llseek = default_llseek,
2149};
2150#endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2151
2152/**
2153 * smk_read_logging - read() for /smack/logging
2154 * @filp: file pointer, not actually used
2155 * @buf: where to put the result
2156 * @count: maximum to send along
2157 * @ppos: where to start
2158 *
2159 * Returns number of bytes read or error code, as appropriate
2160 */
2161static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2162 size_t count, loff_t *ppos)
2163{
2164 char temp[32];
2165 ssize_t rc;
2166
2167 if (*ppos != 0)
2168 return 0;
2169
2170 sprintf(temp, "%d\n", log_policy);
2171 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2172 return rc;
2173}
2174
2175/**
2176 * smk_write_logging - write() for /smack/logging
2177 * @file: file pointer, not actually used
2178 * @buf: where to get the data from
2179 * @count: bytes sent
2180 * @ppos: where to start
2181 *
2182 * Returns number of bytes written or error code, as appropriate
2183 */
2184static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2185 size_t count, loff_t *ppos)
2186{
2187 char temp[32];
2188 int i;
2189
2190 if (!smack_privileged(CAP_MAC_ADMIN))
2191 return -EPERM;
2192
2193 if (count >= sizeof(temp) || count == 0)
2194 return -EINVAL;
2195
2196 if (copy_from_user(temp, buf, count) != 0)
2197 return -EFAULT;
2198
2199 temp[count] = '\0';
2200
2201 if (sscanf(temp, "%d", &i) != 1)
2202 return -EINVAL;
2203 if (i < 0 || i > 3)
2204 return -EINVAL;
2205 log_policy = i;
2206 return count;
2207}
2208
2209
2210
2211static const struct file_operations smk_logging_ops = {
2212 .read = smk_read_logging,
2213 .write = smk_write_logging,
2214 .llseek = default_llseek,
2215};
2216
2217/*
2218 * Seq_file read operations for /smack/load-self
2219 */
2220
2221static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2222{
2223 struct task_smack *tsp = smack_cred(current_cred());
2224
2225 return smk_seq_start(s, pos, &tsp->smk_rules);
2226}
2227
2228static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2229{
2230 struct task_smack *tsp = smack_cred(current_cred());
2231
2232 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2233}
2234
2235static int load_self_seq_show(struct seq_file *s, void *v)
2236{
2237 struct list_head *list = v;
2238 struct smack_rule *srp =
2239 list_entry_rcu(list, struct smack_rule, list);
2240
2241 smk_rule_show(s, srp, SMK_LABELLEN);
2242
2243 return 0;
2244}
2245
2246static const struct seq_operations load_self_seq_ops = {
2247 .start = load_self_seq_start,
2248 .next = load_self_seq_next,
2249 .show = load_self_seq_show,
2250 .stop = smk_seq_stop,
2251};
2252
2253
2254/**
2255 * smk_open_load_self - open() for /smack/load-self2
2256 * @inode: inode structure representing file
2257 * @file: "load" file pointer
2258 *
2259 * For reading, use load_seq_* seq_file reading operations.
2260 */
2261static int smk_open_load_self(struct inode *inode, struct file *file)
2262{
2263 return seq_open(file, &load_self_seq_ops);
2264}
2265
2266/**
2267 * smk_write_load_self - write() for /smack/load-self
2268 * @file: file pointer, not actually used
2269 * @buf: where to get the data from
2270 * @count: bytes sent
2271 * @ppos: where to start - must be 0
2272 *
2273 */
2274static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2275 size_t count, loff_t *ppos)
2276{
2277 struct task_smack *tsp = smack_cred(current_cred());
2278
2279 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2280 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2281}
2282
2283static const struct file_operations smk_load_self_ops = {
2284 .open = smk_open_load_self,
2285 .read = seq_read,
2286 .llseek = seq_lseek,
2287 .write = smk_write_load_self,
2288 .release = seq_release,
2289};
2290
2291/**
2292 * smk_user_access - handle access check transaction
2293 * @file: file pointer
2294 * @buf: data from user space
2295 * @count: bytes sent
2296 * @ppos: where to start - must be 0
2297 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
2298 */
2299static ssize_t smk_user_access(struct file *file, const char __user *buf,
2300 size_t count, loff_t *ppos, int format)
2301{
2302 struct smack_parsed_rule rule;
2303 char *data;
2304 int res;
2305
2306 data = simple_transaction_get(file, buf, count);
2307 if (IS_ERR(data))
2308 return PTR_ERR(data);
2309
2310 if (format == SMK_FIXED24_FMT) {
2311 if (count < SMK_LOADLEN)
2312 return -EINVAL;
2313 res = smk_parse_rule(data, &rule, 0);
2314 } else {
2315 /*
2316 * simple_transaction_get() returns null-terminated data
2317 */
2318 res = smk_parse_long_rule(data, &rule, 0, 3);
2319 }
2320
2321 if (res >= 0)
2322 res = smk_access(rule.smk_subject, rule.smk_object,
2323 rule.smk_access1, NULL);
2324 else if (res != -ENOENT)
2325 return res;
2326
2327 /*
2328 * smk_access() can return a value > 0 in the "bringup" case.
2329 */
2330 data[0] = res >= 0 ? '1' : '0';
2331 data[1] = '\0';
2332
2333 simple_transaction_set(file, 2);
2334
2335 if (format == SMK_FIXED24_FMT)
2336 return SMK_LOADLEN;
2337 return count;
2338}
2339
2340/**
2341 * smk_write_access - handle access check transaction
2342 * @file: file pointer
2343 * @buf: data from user space
2344 * @count: bytes sent
2345 * @ppos: where to start - must be 0
2346 */
2347static ssize_t smk_write_access(struct file *file, const char __user *buf,
2348 size_t count, loff_t *ppos)
2349{
2350 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2351}
2352
2353static const struct file_operations smk_access_ops = {
2354 .write = smk_write_access,
2355 .read = simple_transaction_read,
2356 .release = simple_transaction_release,
2357 .llseek = generic_file_llseek,
2358};
2359
2360
2361/*
2362 * Seq_file read operations for /smack/load2
2363 */
2364
2365static int load2_seq_show(struct seq_file *s, void *v)
2366{
2367 struct list_head *list = v;
2368 struct smack_rule *srp;
2369 struct smack_known *skp =
2370 list_entry_rcu(list, struct smack_known, list);
2371
2372 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
2373 smk_rule_show(s, srp, SMK_LONGLABEL);
2374
2375 return 0;
2376}
2377
2378static const struct seq_operations load2_seq_ops = {
2379 .start = load2_seq_start,
2380 .next = load2_seq_next,
2381 .show = load2_seq_show,
2382 .stop = smk_seq_stop,
2383};
2384
2385/**
2386 * smk_open_load2 - open() for /smack/load2
2387 * @inode: inode structure representing file
2388 * @file: "load2" file pointer
2389 *
2390 * For reading, use load2_seq_* seq_file reading operations.
2391 */
2392static int smk_open_load2(struct inode *inode, struct file *file)
2393{
2394 return seq_open(file, &load2_seq_ops);
2395}
2396
2397/**
2398 * smk_write_load2 - write() for /smack/load2
2399 * @file: file pointer, not actually used
2400 * @buf: where to get the data from
2401 * @count: bytes sent
2402 * @ppos: where to start - must be 0
2403 *
2404 */
2405static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2406 size_t count, loff_t *ppos)
2407{
2408 /*
2409 * Must have privilege.
2410 */
2411 if (!smack_privileged(CAP_MAC_ADMIN))
2412 return -EPERM;
2413
2414 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2415 SMK_LONG_FMT);
2416}
2417
2418static const struct file_operations smk_load2_ops = {
2419 .open = smk_open_load2,
2420 .read = seq_read,
2421 .llseek = seq_lseek,
2422 .write = smk_write_load2,
2423 .release = seq_release,
2424};
2425
2426/*
2427 * Seq_file read operations for /smack/load-self2
2428 */
2429
2430static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2431{
2432 struct task_smack *tsp = smack_cred(current_cred());
2433
2434 return smk_seq_start(s, pos, &tsp->smk_rules);
2435}
2436
2437static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2438{
2439 struct task_smack *tsp = smack_cred(current_cred());
2440
2441 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2442}
2443
2444static int load_self2_seq_show(struct seq_file *s, void *v)
2445{
2446 struct list_head *list = v;
2447 struct smack_rule *srp =
2448 list_entry_rcu(list, struct smack_rule, list);
2449
2450 smk_rule_show(s, srp, SMK_LONGLABEL);
2451
2452 return 0;
2453}
2454
2455static const struct seq_operations load_self2_seq_ops = {
2456 .start = load_self2_seq_start,
2457 .next = load_self2_seq_next,
2458 .show = load_self2_seq_show,
2459 .stop = smk_seq_stop,
2460};
2461
2462/**
2463 * smk_open_load_self2 - open() for /smack/load-self2
2464 * @inode: inode structure representing file
2465 * @file: "load" file pointer
2466 *
2467 * For reading, use load_seq_* seq_file reading operations.
2468 */
2469static int smk_open_load_self2(struct inode *inode, struct file *file)
2470{
2471 return seq_open(file, &load_self2_seq_ops);
2472}
2473
2474/**
2475 * smk_write_load_self2 - write() for /smack/load-self2
2476 * @file: file pointer, not actually used
2477 * @buf: where to get the data from
2478 * @count: bytes sent
2479 * @ppos: where to start - must be 0
2480 *
2481 */
2482static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2483 size_t count, loff_t *ppos)
2484{
2485 struct task_smack *tsp = smack_cred(current_cred());
2486
2487 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2488 &tsp->smk_rules_lock, SMK_LONG_FMT);
2489}
2490
2491static const struct file_operations smk_load_self2_ops = {
2492 .open = smk_open_load_self2,
2493 .read = seq_read,
2494 .llseek = seq_lseek,
2495 .write = smk_write_load_self2,
2496 .release = seq_release,
2497};
2498
2499/**
2500 * smk_write_access2 - handle access check transaction
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_access2(struct file *file, const char __user *buf,
2507 size_t count, loff_t *ppos)
2508{
2509 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2510}
2511
2512static const struct file_operations smk_access2_ops = {
2513 .write = smk_write_access2,
2514 .read = simple_transaction_read,
2515 .release = simple_transaction_release,
2516 .llseek = generic_file_llseek,
2517};
2518
2519/**
2520 * smk_write_revoke_subj - write() for /smack/revoke-subject
2521 * @file: file pointer
2522 * @buf: data from user space
2523 * @count: bytes sent
2524 * @ppos: where to start - must be 0
2525 */
2526static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2527 size_t count, loff_t *ppos)
2528{
2529 char *data;
2530 const char *cp;
2531 struct smack_known *skp;
2532 struct smack_rule *sp;
2533 struct list_head *rule_list;
2534 struct mutex *rule_lock;
2535 int rc = count;
2536
2537 if (*ppos != 0)
2538 return -EINVAL;
2539
2540 if (!smack_privileged(CAP_MAC_ADMIN))
2541 return -EPERM;
2542
2543 if (count == 0 || count > SMK_LONGLABEL)
2544 return -EINVAL;
2545
2546 data = memdup_user(buf, count);
2547 if (IS_ERR(data))
2548 return PTR_ERR(data);
2549
2550 cp = smk_parse_smack(data, count);
2551 if (IS_ERR(cp)) {
2552 rc = PTR_ERR(cp);
2553 goto out_data;
2554 }
2555
2556 skp = smk_find_entry(cp);
2557 if (skp == NULL)
2558 goto out_cp;
2559
2560 rule_list = &skp->smk_rules;
2561 rule_lock = &skp->smk_rules_lock;
2562
2563 mutex_lock(rule_lock);
2564
2565 list_for_each_entry_rcu(sp, rule_list, list)
2566 sp->smk_access = 0;
2567
2568 mutex_unlock(rule_lock);
2569
2570out_cp:
2571 kfree(cp);
2572out_data:
2573 kfree(data);
2574
2575 return rc;
2576}
2577
2578static const struct file_operations smk_revoke_subj_ops = {
2579 .write = smk_write_revoke_subj,
2580 .read = simple_transaction_read,
2581 .release = simple_transaction_release,
2582 .llseek = generic_file_llseek,
2583};
2584
2585/**
2586 * smk_init_sysfs - initialize /sys/fs/smackfs
2587 *
2588 */
2589static int smk_init_sysfs(void)
2590{
2591 return sysfs_create_mount_point(fs_kobj, "smackfs");
2592}
2593
2594/**
2595 * smk_write_change_rule - write() for /smack/change-rule
2596 * @file: file pointer
2597 * @buf: data from user space
2598 * @count: bytes sent
2599 * @ppos: where to start - must be 0
2600 */
2601static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2602 size_t count, loff_t *ppos)
2603{
2604 /*
2605 * Must have privilege.
2606 */
2607 if (!smack_privileged(CAP_MAC_ADMIN))
2608 return -EPERM;
2609
2610 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2611 SMK_CHANGE_FMT);
2612}
2613
2614static const struct file_operations smk_change_rule_ops = {
2615 .write = smk_write_change_rule,
2616 .read = simple_transaction_read,
2617 .release = simple_transaction_release,
2618 .llseek = generic_file_llseek,
2619};
2620
2621/**
2622 * smk_read_syslog - read() for smackfs/syslog
2623 * @filp: file pointer, not actually used
2624 * @buf: where to put the result
2625 * @cn: maximum to send along
2626 * @ppos: where to start
2627 *
2628 * Returns number of bytes read or error code, as appropriate
2629 */
2630static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2631 size_t cn, loff_t *ppos)
2632{
2633 struct smack_known *skp;
2634 ssize_t rc = -EINVAL;
2635 int asize;
2636
2637 if (*ppos != 0)
2638 return 0;
2639
2640 if (smack_syslog_label == NULL)
2641 skp = &smack_known_star;
2642 else
2643 skp = smack_syslog_label;
2644
2645 asize = strlen(skp->smk_known) + 1;
2646
2647 if (cn >= asize)
2648 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2649 asize);
2650
2651 return rc;
2652}
2653
2654/**
2655 * smk_write_syslog - write() for smackfs/syslog
2656 * @file: file pointer, not actually used
2657 * @buf: where to get the data from
2658 * @count: bytes sent
2659 * @ppos: where to start
2660 *
2661 * Returns number of bytes written or error code, as appropriate
2662 */
2663static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2664 size_t count, loff_t *ppos)
2665{
2666 char *data;
2667 struct smack_known *skp;
2668 int rc = count;
2669
2670 if (!smack_privileged(CAP_MAC_ADMIN))
2671 return -EPERM;
2672
2673 /* Enough data must be present */
2674 if (count == 0 || count > PAGE_SIZE)
2675 return -EINVAL;
2676
2677 data = memdup_user_nul(buf, count);
2678 if (IS_ERR(data))
2679 return PTR_ERR(data);
2680
2681 skp = smk_import_entry(data, count);
2682 if (IS_ERR(skp))
2683 rc = PTR_ERR(skp);
2684 else
2685 smack_syslog_label = skp;
2686
2687 kfree(data);
2688 return rc;
2689}
2690
2691static const struct file_operations smk_syslog_ops = {
2692 .read = smk_read_syslog,
2693 .write = smk_write_syslog,
2694 .llseek = default_llseek,
2695};
2696
2697/*
2698 * Seq_file read operations for /smack/relabel-self
2699 */
2700
2701static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2702{
2703 struct task_smack *tsp = smack_cred(current_cred());
2704
2705 return smk_seq_start(s, pos, &tsp->smk_relabel);
2706}
2707
2708static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2709{
2710 struct task_smack *tsp = smack_cred(current_cred());
2711
2712 return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2713}
2714
2715static int relabel_self_seq_show(struct seq_file *s, void *v)
2716{
2717 struct list_head *list = v;
2718 struct smack_known_list_elem *sklep =
2719 list_entry(list, struct smack_known_list_elem, list);
2720
2721 seq_puts(s, sklep->smk_label->smk_known);
2722 seq_putc(s, ' ');
2723
2724 return 0;
2725}
2726
2727static const struct seq_operations relabel_self_seq_ops = {
2728 .start = relabel_self_seq_start,
2729 .next = relabel_self_seq_next,
2730 .show = relabel_self_seq_show,
2731 .stop = smk_seq_stop,
2732};
2733
2734/**
2735 * smk_open_relabel_self - open() for /smack/relabel-self
2736 * @inode: inode structure representing file
2737 * @file: "relabel-self" file pointer
2738 *
2739 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2740 * file_operations
2741 */
2742static int smk_open_relabel_self(struct inode *inode, struct file *file)
2743{
2744 return seq_open(file, &relabel_self_seq_ops);
2745}
2746
2747/**
2748 * smk_write_relabel_self - write() for /smack/relabel-self
2749 * @file: file pointer, not actually used
2750 * @buf: where to get the data from
2751 * @count: bytes sent
2752 * @ppos: where to start - must be 0
2753 *
2754 */
2755static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2756 size_t count, loff_t *ppos)
2757{
2758 char *data;
2759 int rc;
2760 LIST_HEAD(list_tmp);
2761
2762 /*
2763 * Must have privilege.
2764 */
2765 if (!smack_privileged(CAP_MAC_ADMIN))
2766 return -EPERM;
2767
2768 /*
2769 * No partial write.
2770 * Enough data must be present.
2771 */
2772 if (*ppos != 0)
2773 return -EINVAL;
2774 if (count == 0 || count > PAGE_SIZE)
2775 return -EINVAL;
2776
2777 data = memdup_user_nul(buf, count);
2778 if (IS_ERR(data))
2779 return PTR_ERR(data);
2780
2781 rc = smk_parse_label_list(data, &list_tmp);
2782 kfree(data);
2783
2784 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2785 struct cred *new;
2786 struct task_smack *tsp;
2787
2788 new = prepare_creds();
2789 if (!new) {
2790 rc = -ENOMEM;
2791 goto out;
2792 }
2793 tsp = smack_cred(new);
2794 smk_destroy_label_list(&tsp->smk_relabel);
2795 list_splice(&list_tmp, &tsp->smk_relabel);
2796 commit_creds(new);
2797 return count;
2798 }
2799out:
2800 smk_destroy_label_list(&list_tmp);
2801 return rc;
2802}
2803
2804static const struct file_operations smk_relabel_self_ops = {
2805 .open = smk_open_relabel_self,
2806 .read = seq_read,
2807 .llseek = seq_lseek,
2808 .write = smk_write_relabel_self,
2809 .release = seq_release,
2810};
2811
2812/**
2813 * smk_read_ptrace - read() for /smack/ptrace
2814 * @filp: file pointer, not actually used
2815 * @buf: where to put the result
2816 * @count: maximum to send along
2817 * @ppos: where to start
2818 *
2819 * Returns number of bytes read or error code, as appropriate
2820 */
2821static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2822 size_t count, loff_t *ppos)
2823{
2824 char temp[32];
2825 ssize_t rc;
2826
2827 if (*ppos != 0)
2828 return 0;
2829
2830 sprintf(temp, "%d\n", smack_ptrace_rule);
2831 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2832 return rc;
2833}
2834
2835/**
2836 * smk_write_ptrace - write() for /smack/ptrace
2837 * @file: file pointer
2838 * @buf: data from user space
2839 * @count: bytes sent
2840 * @ppos: where to start - must be 0
2841 */
2842static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2843 size_t count, loff_t *ppos)
2844{
2845 char temp[32];
2846 int i;
2847
2848 if (!smack_privileged(CAP_MAC_ADMIN))
2849 return -EPERM;
2850
2851 if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2852 return -EINVAL;
2853
2854 if (copy_from_user(temp, buf, count) != 0)
2855 return -EFAULT;
2856
2857 temp[count] = '\0';
2858
2859 if (sscanf(temp, "%d", &i) != 1)
2860 return -EINVAL;
2861 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2862 return -EINVAL;
2863 smack_ptrace_rule = i;
2864
2865 return count;
2866}
2867
2868static const struct file_operations smk_ptrace_ops = {
2869 .write = smk_write_ptrace,
2870 .read = smk_read_ptrace,
2871 .llseek = default_llseek,
2872};
2873
2874/**
2875 * smk_fill_super - fill the smackfs superblock
2876 * @sb: the empty superblock
2877 * @fc: unused
2878 *
2879 * Fill in the well known entries for the smack filesystem
2880 *
2881 * Returns 0 on success, an error code on failure
2882 */
2883static int smk_fill_super(struct super_block *sb, struct fs_context *fc)
2884{
2885 int rc;
2886
2887 static const struct tree_descr smack_files[] = {
2888 [SMK_LOAD] = {
2889 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2890 [SMK_CIPSO] = {
2891 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2892 [SMK_DOI] = {
2893 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2894 [SMK_DIRECT] = {
2895 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2896 [SMK_AMBIENT] = {
2897 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2898 [SMK_NET4ADDR] = {
2899 "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2900 [SMK_ONLYCAP] = {
2901 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2902 [SMK_LOGGING] = {
2903 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2904 [SMK_LOAD_SELF] = {
2905 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2906 [SMK_ACCESSES] = {
2907 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2908 [SMK_MAPPED] = {
2909 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2910 [SMK_LOAD2] = {
2911 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2912 [SMK_LOAD_SELF2] = {
2913 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2914 [SMK_ACCESS2] = {
2915 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2916 [SMK_CIPSO2] = {
2917 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2918 [SMK_REVOKE_SUBJ] = {
2919 "revoke-subject", &smk_revoke_subj_ops,
2920 S_IRUGO|S_IWUSR},
2921 [SMK_CHANGE_RULE] = {
2922 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2923 [SMK_SYSLOG] = {
2924 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2925 [SMK_PTRACE] = {
2926 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2927#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2928 [SMK_UNCONFINED] = {
2929 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2930#endif
2931#if IS_ENABLED(CONFIG_IPV6)
2932 [SMK_NET6ADDR] = {
2933 "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2934#endif /* CONFIG_IPV6 */
2935 [SMK_RELABEL_SELF] = {
2936 "relabel-self", &smk_relabel_self_ops,
2937 S_IRUGO|S_IWUGO},
2938 /* last one */
2939 {""}
2940 };
2941
2942 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2943 if (rc != 0) {
2944 printk(KERN_ERR "%s failed %d while creating inodes\n",
2945 __func__, rc);
2946 return rc;
2947 }
2948
2949 return 0;
2950}
2951
2952/**
2953 * smk_get_tree - get the smackfs superblock
2954 * @fc: The mount context, including any options
2955 *
2956 * Just passes everything along.
2957 *
2958 * Returns what the lower level code does.
2959 */
2960static int smk_get_tree(struct fs_context *fc)
2961{
2962 return get_tree_single(fc, smk_fill_super);
2963}
2964
2965static const struct fs_context_operations smk_context_ops = {
2966 .get_tree = smk_get_tree,
2967};
2968
2969/**
2970 * smk_init_fs_context - Initialise a filesystem context for smackfs
2971 * @fc: The blank mount context
2972 */
2973static int smk_init_fs_context(struct fs_context *fc)
2974{
2975 fc->ops = &smk_context_ops;
2976 return 0;
2977}
2978
2979static struct file_system_type smk_fs_type = {
2980 .name = "smackfs",
2981 .init_fs_context = smk_init_fs_context,
2982 .kill_sb = kill_litter_super,
2983};
2984
2985static struct vfsmount *smackfs_mount;
2986
2987/**
2988 * init_smk_fs - get the smackfs superblock
2989 *
2990 * register the smackfs
2991 *
2992 * Do not register smackfs if Smack wasn't enabled
2993 * on boot. We can not put this method normally under the
2994 * smack_init() code path since the security subsystem get
2995 * initialized before the vfs caches.
2996 *
2997 * Returns true if we were not chosen on boot or if
2998 * we were chosen and filesystem registration succeeded.
2999 */
3000static int __init init_smk_fs(void)
3001{
3002 int err;
3003 int rc;
3004
3005 if (smack_enabled == 0)
3006 return 0;
3007
3008 err = smk_init_sysfs();
3009 if (err)
3010 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
3011
3012 err = register_filesystem(&smk_fs_type);
3013 if (!err) {
3014 smackfs_mount = kern_mount(&smk_fs_type);
3015 if (IS_ERR(smackfs_mount)) {
3016 printk(KERN_ERR "smackfs: could not mount!\n");
3017 err = PTR_ERR(smackfs_mount);
3018 smackfs_mount = NULL;
3019 }
3020 }
3021
3022 smk_cipso_doi();
3023 smk_unlbl_ambient(NULL);
3024
3025 rc = smack_populate_secattr(&smack_known_floor);
3026 if (err == 0 && rc < 0)
3027 err = rc;
3028 rc = smack_populate_secattr(&smack_known_hat);
3029 if (err == 0 && rc < 0)
3030 err = rc;
3031 rc = smack_populate_secattr(&smack_known_huh);
3032 if (err == 0 && rc < 0)
3033 err = rc;
3034 rc = smack_populate_secattr(&smack_known_star);
3035 if (err == 0 && rc < 0)
3036 err = rc;
3037 rc = smack_populate_secattr(&smack_known_web);
3038 if (err == 0 && rc < 0)
3039 err = rc;
3040
3041 return err;
3042}
3043
3044__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 "smack.h"
30
31/*
32 * smackfs pseudo filesystem.
33 */
34
35enum smk_inos {
36 SMK_ROOT_INO = 2,
37 SMK_LOAD = 3, /* load policy */
38 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
39 SMK_DOI = 5, /* CIPSO DOI */
40 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
41 SMK_AMBIENT = 7, /* internet ambient label */
42 SMK_NETLBLADDR = 8, /* single label hosts */
43 SMK_ONLYCAP = 9, /* the only "capable" label */
44 SMK_LOGGING = 10, /* logging */
45 SMK_LOAD_SELF = 11, /* task specific rules */
46 SMK_ACCESSES = 12, /* access policy */
47 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
48 SMK_LOAD2 = 14, /* load policy with long labels */
49 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
50 SMK_ACCESS2 = 16, /* make an access check with long labels */
51 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
52};
53
54/*
55 * List locks
56 */
57static DEFINE_MUTEX(smack_list_lock);
58static DEFINE_MUTEX(smack_cipso_lock);
59static DEFINE_MUTEX(smack_ambient_lock);
60static DEFINE_MUTEX(smk_netlbladdr_lock);
61
62/*
63 * This is the "ambient" label for network traffic.
64 * If it isn't somehow marked, use this.
65 * It can be reset via smackfs/ambient
66 */
67char *smack_net_ambient;
68
69/*
70 * This is the level in a CIPSO header that indicates a
71 * smack label is contained directly in the category set.
72 * It can be reset via smackfs/direct
73 */
74int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
75
76/*
77 * This is the level in a CIPSO header that indicates a
78 * secid is contained directly in the category set.
79 * It can be reset via smackfs/mapped
80 */
81int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
82
83/*
84 * Unless a process is running with this label even
85 * having CAP_MAC_OVERRIDE isn't enough to grant
86 * privilege to violate MAC policy. If no label is
87 * designated (the NULL case) capabilities apply to
88 * everyone. It is expected that the hat (^) label
89 * will be used if any label is used.
90 */
91char *smack_onlycap;
92
93/*
94 * Certain IP addresses may be designated as single label hosts.
95 * Packets are sent there unlabeled, but only from tasks that
96 * can write to the specified label.
97 */
98
99LIST_HEAD(smk_netlbladdr_list);
100
101/*
102 * Rule lists are maintained for each label.
103 * This master list is just for reading /smack/load and /smack/load2.
104 */
105struct smack_master_list {
106 struct list_head list;
107 struct smack_rule *smk_rule;
108};
109
110LIST_HEAD(smack_rule_list);
111
112static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
113
114const char *smack_cipso_option = SMACK_CIPSO_OPTION;
115
116/*
117 * Values for parsing cipso rules
118 * SMK_DIGITLEN: Length of a digit field in a rule.
119 * SMK_CIPSOMIN: Minimum possible cipso rule length.
120 * SMK_CIPSOMAX: Maximum possible cipso rule length.
121 */
122#define SMK_DIGITLEN 4
123#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
124#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
125
126/*
127 * Values for parsing MAC rules
128 * SMK_ACCESS: Maximum possible combination of access permissions
129 * SMK_ACCESSLEN: Maximum length for a rule access field
130 * SMK_LOADLEN: Smack rule length
131 */
132#define SMK_OACCESS "rwxa"
133#define SMK_ACCESS "rwxat"
134#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
135#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
136#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
137#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
138
139/*
140 * Stricly for CIPSO level manipulation.
141 * Set the category bit number in a smack label sized buffer.
142 */
143static inline void smack_catset_bit(unsigned int cat, char *catsetp)
144{
145 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
146 return;
147
148 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
149}
150
151/**
152 * smk_netlabel_audit_set - fill a netlbl_audit struct
153 * @nap: structure to fill
154 */
155static void smk_netlabel_audit_set(struct netlbl_audit *nap)
156{
157 nap->loginuid = audit_get_loginuid(current);
158 nap->sessionid = audit_get_sessionid(current);
159 nap->secid = smack_to_secid(smk_of_current());
160}
161
162/*
163 * Value for parsing single label host rules
164 * "1.2.3.4 X"
165 */
166#define SMK_NETLBLADDRMIN 9
167
168/**
169 * smk_set_access - add a rule to the rule list
170 * @srp: the new rule to add
171 * @rule_list: the list of rules
172 * @rule_lock: the rule list lock
173 *
174 * Looks through the current subject/object/access list for
175 * the subject/object pair and replaces the access that was
176 * there. If the pair isn't found add it with the specified
177 * access.
178 *
179 * Returns 1 if a rule was found to exist already, 0 if it is new
180 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
181 * during the allocation of the new pair to add.
182 */
183static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list,
184 struct mutex *rule_lock)
185{
186 struct smack_rule *sp;
187 int found = 0;
188
189 mutex_lock(rule_lock);
190
191 /*
192 * Because the object label is less likely to match
193 * than the subject label check it first
194 */
195 list_for_each_entry_rcu(sp, rule_list, list) {
196 if (sp->smk_object == srp->smk_object &&
197 sp->smk_subject == srp->smk_subject) {
198 found = 1;
199 sp->smk_access = srp->smk_access;
200 break;
201 }
202 }
203 if (found == 0)
204 list_add_rcu(&srp->list, rule_list);
205
206 mutex_unlock(rule_lock);
207
208 return found;
209}
210
211/**
212 * smk_fill_rule - Fill Smack rule from strings
213 * @subject: subject label string
214 * @object: object label string
215 * @access: access string
216 * @rule: Smack rule
217 * @import: if non-zero, import labels
218 *
219 * Returns 0 on success, -1 on failure
220 */
221static int smk_fill_rule(const char *subject, const char *object,
222 const char *access, struct smack_rule *rule,
223 int import)
224{
225 int rc = -1;
226 int done;
227 const char *cp;
228 struct smack_known *skp;
229
230 if (import) {
231 rule->smk_subject = smk_import(subject, 0);
232 if (rule->smk_subject == NULL)
233 return -1;
234
235 rule->smk_object = smk_import(object, 0);
236 if (rule->smk_object == NULL)
237 return -1;
238 } else {
239 cp = smk_parse_smack(subject, 0);
240 if (cp == NULL)
241 return -1;
242 skp = smk_find_entry(cp);
243 kfree(cp);
244 if (skp == NULL)
245 return -1;
246 rule->smk_subject = skp->smk_known;
247
248 cp = smk_parse_smack(object, 0);
249 if (cp == NULL)
250 return -1;
251 skp = smk_find_entry(cp);
252 kfree(cp);
253 if (skp == NULL)
254 return -1;
255 rule->smk_object = skp->smk_known;
256 }
257
258 rule->smk_access = 0;
259
260 for (cp = access, done = 0; *cp && !done; cp++) {
261 switch (*cp) {
262 case '-':
263 break;
264 case 'r':
265 case 'R':
266 rule->smk_access |= MAY_READ;
267 break;
268 case 'w':
269 case 'W':
270 rule->smk_access |= MAY_WRITE;
271 break;
272 case 'x':
273 case 'X':
274 rule->smk_access |= MAY_EXEC;
275 break;
276 case 'a':
277 case 'A':
278 rule->smk_access |= MAY_APPEND;
279 break;
280 case 't':
281 case 'T':
282 rule->smk_access |= MAY_TRANSMUTE;
283 break;
284 default:
285 done = 1;
286 break;
287 }
288 }
289 rc = 0;
290
291 return rc;
292}
293
294/**
295 * smk_parse_rule - parse Smack rule from load string
296 * @data: string to be parsed whose size is SMK_LOADLEN
297 * @rule: Smack rule
298 * @import: if non-zero, import labels
299 *
300 * Returns 0 on success, -1 on errors.
301 */
302static int smk_parse_rule(const char *data, struct smack_rule *rule, int import)
303{
304 int rc;
305
306 rc = smk_fill_rule(data, data + SMK_LABELLEN,
307 data + SMK_LABELLEN + SMK_LABELLEN, rule, import);
308 return rc;
309}
310
311/**
312 * smk_parse_long_rule - parse Smack rule from rule string
313 * @data: string to be parsed, null terminated
314 * @rule: Smack rule
315 * @import: if non-zero, import labels
316 *
317 * Returns 0 on success, -1 on failure
318 */
319static int smk_parse_long_rule(const char *data, struct smack_rule *rule,
320 int import)
321{
322 char *subject;
323 char *object;
324 char *access;
325 int datalen;
326 int rc = -1;
327
328 /* This is inefficient */
329 datalen = strlen(data);
330
331 /* Our first element can be 64 + \0 with no spaces */
332 subject = kzalloc(datalen + 1, GFP_KERNEL);
333 if (subject == NULL)
334 return -1;
335 object = kzalloc(datalen, GFP_KERNEL);
336 if (object == NULL)
337 goto free_out_s;
338 access = kzalloc(datalen, GFP_KERNEL);
339 if (access == NULL)
340 goto free_out_o;
341
342 if (sscanf(data, "%s %s %s", subject, object, access) == 3)
343 rc = smk_fill_rule(subject, object, access, rule, import);
344
345 kfree(access);
346free_out_o:
347 kfree(object);
348free_out_s:
349 kfree(subject);
350 return rc;
351}
352
353#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
354#define SMK_LONG_FMT 1 /* Variable long label format */
355/**
356 * smk_write_rules_list - write() for any /smack rule file
357 * @file: file pointer, not actually used
358 * @buf: where to get the data from
359 * @count: bytes sent
360 * @ppos: where to start - must be 0
361 * @rule_list: the list of rules to write to
362 * @rule_lock: lock for the rule list
363 * @format: /smack/load or /smack/load2 format.
364 *
365 * Get one smack access rule from above.
366 * The format for SMK_LONG_FMT is:
367 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
368 * The format for SMK_FIXED24_FMT is exactly:
369 * "subject object rwxat"
370 */
371static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
372 size_t count, loff_t *ppos,
373 struct list_head *rule_list,
374 struct mutex *rule_lock, int format)
375{
376 struct smack_master_list *smlp;
377 struct smack_known *skp;
378 struct smack_rule *rule;
379 char *data;
380 int datalen;
381 int rc = -EINVAL;
382 int load = 0;
383
384 /*
385 * No partial writes.
386 * Enough data must be present.
387 */
388 if (*ppos != 0)
389 return -EINVAL;
390
391 if (format == SMK_FIXED24_FMT) {
392 /*
393 * Minor hack for backward compatibility
394 */
395 if (count != SMK_OLOADLEN && count != SMK_LOADLEN)
396 return -EINVAL;
397 datalen = SMK_LOADLEN;
398 } else
399 datalen = count + 1;
400
401 data = kzalloc(datalen, GFP_KERNEL);
402 if (data == NULL)
403 return -ENOMEM;
404
405 if (copy_from_user(data, buf, count) != 0) {
406 rc = -EFAULT;
407 goto out;
408 }
409
410 rule = kzalloc(sizeof(*rule), GFP_KERNEL);
411 if (rule == NULL) {
412 rc = -ENOMEM;
413 goto out;
414 }
415
416 if (format == SMK_LONG_FMT) {
417 /*
418 * Be sure the data string is terminated.
419 */
420 data[count] = '\0';
421 if (smk_parse_long_rule(data, rule, 1))
422 goto out_free_rule;
423 } else {
424 /*
425 * More on the minor hack for backward compatibility
426 */
427 if (count == (SMK_OLOADLEN))
428 data[SMK_OLOADLEN] = '-';
429 if (smk_parse_rule(data, rule, 1))
430 goto out_free_rule;
431 }
432
433
434 if (rule_list == NULL) {
435 load = 1;
436 skp = smk_find_entry(rule->smk_subject);
437 rule_list = &skp->smk_rules;
438 rule_lock = &skp->smk_rules_lock;
439 }
440
441 rc = count;
442 /*
443 * If this is a global as opposed to self and a new rule
444 * it needs to get added for reporting.
445 * smk_set_access returns true if there was already a rule
446 * for the subject/object pair, and false if it was new.
447 */
448 if (!smk_set_access(rule, rule_list, rule_lock)) {
449 if (load) {
450 smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
451 if (smlp != NULL) {
452 smlp->smk_rule = rule;
453 list_add_rcu(&smlp->list, &smack_rule_list);
454 } else
455 rc = -ENOMEM;
456 }
457 goto out;
458 }
459
460out_free_rule:
461 kfree(rule);
462out:
463 kfree(data);
464 return rc;
465}
466
467/*
468 * Core logic for smackfs seq list operations.
469 */
470
471static void *smk_seq_start(struct seq_file *s, loff_t *pos,
472 struct list_head *head)
473{
474 struct list_head *list;
475
476 /*
477 * This is 0 the first time through.
478 */
479 if (s->index == 0)
480 s->private = head;
481
482 if (s->private == NULL)
483 return NULL;
484
485 list = s->private;
486 if (list_empty(list))
487 return NULL;
488
489 if (s->index == 0)
490 return list->next;
491 return list;
492}
493
494static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
495 struct list_head *head)
496{
497 struct list_head *list = v;
498
499 if (list_is_last(list, head)) {
500 s->private = NULL;
501 return NULL;
502 }
503 s->private = list->next;
504 return list->next;
505}
506
507static void smk_seq_stop(struct seq_file *s, void *v)
508{
509 /* No-op */
510}
511
512static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
513{
514 /*
515 * Don't show any rules with label names too long for
516 * interface file (/smack/load or /smack/load2)
517 * because you should expect to be able to write
518 * anything you read back.
519 */
520 if (strlen(srp->smk_subject) >= max || strlen(srp->smk_object) >= max)
521 return;
522
523 seq_printf(s, "%s %s", srp->smk_subject, srp->smk_object);
524
525 seq_putc(s, ' ');
526
527 if (srp->smk_access & MAY_READ)
528 seq_putc(s, 'r');
529 if (srp->smk_access & MAY_WRITE)
530 seq_putc(s, 'w');
531 if (srp->smk_access & MAY_EXEC)
532 seq_putc(s, 'x');
533 if (srp->smk_access & MAY_APPEND)
534 seq_putc(s, 'a');
535 if (srp->smk_access & MAY_TRANSMUTE)
536 seq_putc(s, 't');
537 if (srp->smk_access == 0)
538 seq_putc(s, '-');
539
540 seq_putc(s, '\n');
541}
542
543/*
544 * Seq_file read operations for /smack/load
545 */
546
547static void *load2_seq_start(struct seq_file *s, loff_t *pos)
548{
549 return smk_seq_start(s, pos, &smack_rule_list);
550}
551
552static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
553{
554 return smk_seq_next(s, v, pos, &smack_rule_list);
555}
556
557static int load_seq_show(struct seq_file *s, void *v)
558{
559 struct list_head *list = v;
560 struct smack_master_list *smlp =
561 list_entry(list, struct smack_master_list, list);
562
563 smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);
564
565 return 0;
566}
567
568static const struct seq_operations load_seq_ops = {
569 .start = load2_seq_start,
570 .next = load2_seq_next,
571 .show = load_seq_show,
572 .stop = smk_seq_stop,
573};
574
575/**
576 * smk_open_load - open() for /smack/load
577 * @inode: inode structure representing file
578 * @file: "load" file pointer
579 *
580 * For reading, use load_seq_* seq_file reading operations.
581 */
582static int smk_open_load(struct inode *inode, struct file *file)
583{
584 return seq_open(file, &load_seq_ops);
585}
586
587/**
588 * smk_write_load - write() for /smack/load
589 * @file: file pointer, not actually used
590 * @buf: where to get the data from
591 * @count: bytes sent
592 * @ppos: where to start - must be 0
593 *
594 */
595static ssize_t smk_write_load(struct file *file, const char __user *buf,
596 size_t count, loff_t *ppos)
597{
598
599 /*
600 * Must have privilege.
601 * No partial writes.
602 * Enough data must be present.
603 */
604 if (!capable(CAP_MAC_ADMIN))
605 return -EPERM;
606
607 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
608 SMK_FIXED24_FMT);
609}
610
611static const struct file_operations smk_load_ops = {
612 .open = smk_open_load,
613 .read = seq_read,
614 .llseek = seq_lseek,
615 .write = smk_write_load,
616 .release = seq_release,
617};
618
619/**
620 * smk_cipso_doi - initialize the CIPSO domain
621 */
622static void smk_cipso_doi(void)
623{
624 int rc;
625 struct cipso_v4_doi *doip;
626 struct netlbl_audit nai;
627
628 smk_netlabel_audit_set(&nai);
629
630 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
631 if (rc != 0)
632 printk(KERN_WARNING "%s:%d remove rc = %d\n",
633 __func__, __LINE__, rc);
634
635 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
636 if (doip == NULL)
637 panic("smack: Failed to initialize cipso DOI.\n");
638 doip->map.std = NULL;
639 doip->doi = smk_cipso_doi_value;
640 doip->type = CIPSO_V4_MAP_PASS;
641 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
642 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
643 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
644
645 rc = netlbl_cfg_cipsov4_add(doip, &nai);
646 if (rc != 0) {
647 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
648 __func__, __LINE__, rc);
649 kfree(doip);
650 return;
651 }
652 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
653 if (rc != 0) {
654 printk(KERN_WARNING "%s:%d map add rc = %d\n",
655 __func__, __LINE__, rc);
656 kfree(doip);
657 return;
658 }
659}
660
661/**
662 * smk_unlbl_ambient - initialize the unlabeled domain
663 * @oldambient: previous domain string
664 */
665static void smk_unlbl_ambient(char *oldambient)
666{
667 int rc;
668 struct netlbl_audit nai;
669
670 smk_netlabel_audit_set(&nai);
671
672 if (oldambient != NULL) {
673 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
674 if (rc != 0)
675 printk(KERN_WARNING "%s:%d remove rc = %d\n",
676 __func__, __LINE__, rc);
677 }
678 if (smack_net_ambient == NULL)
679 smack_net_ambient = smack_known_floor.smk_known;
680
681 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET,
682 NULL, NULL, &nai);
683 if (rc != 0)
684 printk(KERN_WARNING "%s:%d add rc = %d\n",
685 __func__, __LINE__, rc);
686}
687
688/*
689 * Seq_file read operations for /smack/cipso
690 */
691
692static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
693{
694 return smk_seq_start(s, pos, &smack_known_list);
695}
696
697static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
698{
699 return smk_seq_next(s, v, pos, &smack_known_list);
700}
701
702/*
703 * Print cipso labels in format:
704 * label level[/cat[,cat]]
705 */
706static int cipso_seq_show(struct seq_file *s, void *v)
707{
708 struct list_head *list = v;
709 struct smack_known *skp =
710 list_entry(list, struct smack_known, list);
711 struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
712 char sep = '/';
713 int i;
714
715 /*
716 * Don't show a label that could not have been set using
717 * /smack/cipso. This is in support of the notion that
718 * anything read from /smack/cipso ought to be writeable
719 * to /smack/cipso.
720 *
721 * /smack/cipso2 should be used instead.
722 */
723 if (strlen(skp->smk_known) >= SMK_LABELLEN)
724 return 0;
725
726 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
727
728 for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0;
729 i = netlbl_secattr_catmap_walk(cmp, i + 1)) {
730 seq_printf(s, "%c%d", sep, i);
731 sep = ',';
732 }
733
734 seq_putc(s, '\n');
735
736 return 0;
737}
738
739static const struct seq_operations cipso_seq_ops = {
740 .start = cipso_seq_start,
741 .next = cipso_seq_next,
742 .show = cipso_seq_show,
743 .stop = smk_seq_stop,
744};
745
746/**
747 * smk_open_cipso - open() for /smack/cipso
748 * @inode: inode structure representing file
749 * @file: "cipso" file pointer
750 *
751 * Connect our cipso_seq_* operations with /smack/cipso
752 * file_operations
753 */
754static int smk_open_cipso(struct inode *inode, struct file *file)
755{
756 return seq_open(file, &cipso_seq_ops);
757}
758
759/**
760 * smk_set_cipso - do the work for write() for cipso and cipso2
761 * @file: file pointer, not actually used
762 * @buf: where to get the data from
763 * @count: bytes sent
764 * @ppos: where to start
765 * @format: /smack/cipso or /smack/cipso2
766 *
767 * Accepts only one cipso rule per write call.
768 * Returns number of bytes written or error code, as appropriate
769 */
770static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
771 size_t count, loff_t *ppos, int format)
772{
773 struct smack_known *skp;
774 struct netlbl_lsm_secattr ncats;
775 char mapcatset[SMK_CIPSOLEN];
776 int maplevel;
777 unsigned int cat;
778 int catlen;
779 ssize_t rc = -EINVAL;
780 char *data = NULL;
781 char *rule;
782 int ret;
783 int i;
784
785 /*
786 * Must have privilege.
787 * No partial writes.
788 * Enough data must be present.
789 */
790 if (!capable(CAP_MAC_ADMIN))
791 return -EPERM;
792 if (*ppos != 0)
793 return -EINVAL;
794 if (format == SMK_FIXED24_FMT &&
795 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
796 return -EINVAL;
797
798 data = kzalloc(count + 1, GFP_KERNEL);
799 if (data == NULL)
800 return -ENOMEM;
801
802 if (copy_from_user(data, buf, count) != 0) {
803 rc = -EFAULT;
804 goto unlockedout;
805 }
806
807 data[count] = '\0';
808 rule = data;
809 /*
810 * Only allow one writer at a time. Writes should be
811 * quite rare and small in any case.
812 */
813 mutex_lock(&smack_cipso_lock);
814
815 skp = smk_import_entry(rule, 0);
816 if (skp == NULL)
817 goto out;
818
819 if (format == SMK_FIXED24_FMT)
820 rule += SMK_LABELLEN;
821 else
822 rule += strlen(skp->smk_known);
823
824 ret = sscanf(rule, "%d", &maplevel);
825 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
826 goto out;
827
828 rule += SMK_DIGITLEN;
829 ret = sscanf(rule, "%d", &catlen);
830 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
831 goto out;
832
833 if (format == SMK_FIXED24_FMT &&
834 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
835 goto out;
836
837 memset(mapcatset, 0, sizeof(mapcatset));
838
839 for (i = 0; i < catlen; i++) {
840 rule += SMK_DIGITLEN;
841 ret = sscanf(rule, "%u", &cat);
842 if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
843 goto out;
844
845 smack_catset_bit(cat, mapcatset);
846 }
847
848 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
849 if (rc >= 0) {
850 netlbl_secattr_catmap_free(skp->smk_netlabel.attr.mls.cat);
851 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
852 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
853 rc = count;
854 }
855
856out:
857 mutex_unlock(&smack_cipso_lock);
858unlockedout:
859 kfree(data);
860 return rc;
861}
862
863/**
864 * smk_write_cipso - write() for /smack/cipso
865 * @file: file pointer, not actually used
866 * @buf: where to get the data from
867 * @count: bytes sent
868 * @ppos: where to start
869 *
870 * Accepts only one cipso rule per write call.
871 * Returns number of bytes written or error code, as appropriate
872 */
873static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
874 size_t count, loff_t *ppos)
875{
876 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
877}
878
879static const struct file_operations smk_cipso_ops = {
880 .open = smk_open_cipso,
881 .read = seq_read,
882 .llseek = seq_lseek,
883 .write = smk_write_cipso,
884 .release = seq_release,
885};
886
887/*
888 * Seq_file read operations for /smack/cipso2
889 */
890
891/*
892 * Print cipso labels in format:
893 * label level[/cat[,cat]]
894 */
895static int cipso2_seq_show(struct seq_file *s, void *v)
896{
897 struct list_head *list = v;
898 struct smack_known *skp =
899 list_entry(list, struct smack_known, list);
900 struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
901 char sep = '/';
902 int i;
903
904 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
905
906 for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0;
907 i = netlbl_secattr_catmap_walk(cmp, i + 1)) {
908 seq_printf(s, "%c%d", sep, i);
909 sep = ',';
910 }
911
912 seq_putc(s, '\n');
913
914 return 0;
915}
916
917static const struct seq_operations cipso2_seq_ops = {
918 .start = cipso_seq_start,
919 .next = cipso_seq_next,
920 .show = cipso2_seq_show,
921 .stop = smk_seq_stop,
922};
923
924/**
925 * smk_open_cipso2 - open() for /smack/cipso2
926 * @inode: inode structure representing file
927 * @file: "cipso2" file pointer
928 *
929 * Connect our cipso_seq_* operations with /smack/cipso2
930 * file_operations
931 */
932static int smk_open_cipso2(struct inode *inode, struct file *file)
933{
934 return seq_open(file, &cipso2_seq_ops);
935}
936
937/**
938 * smk_write_cipso2 - write() for /smack/cipso2
939 * @file: file pointer, not actually used
940 * @buf: where to get the data from
941 * @count: bytes sent
942 * @ppos: where to start
943 *
944 * Accepts only one cipso rule per write call.
945 * Returns number of bytes written or error code, as appropriate
946 */
947static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
948 size_t count, loff_t *ppos)
949{
950 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
951}
952
953static const struct file_operations smk_cipso2_ops = {
954 .open = smk_open_cipso2,
955 .read = seq_read,
956 .llseek = seq_lseek,
957 .write = smk_write_cipso2,
958 .release = seq_release,
959};
960
961/*
962 * Seq_file read operations for /smack/netlabel
963 */
964
965static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
966{
967 return smk_seq_start(s, pos, &smk_netlbladdr_list);
968}
969
970static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
971{
972 return smk_seq_next(s, v, pos, &smk_netlbladdr_list);
973}
974#define BEBITS (sizeof(__be32) * 8)
975
976/*
977 * Print host/label pairs
978 */
979static int netlbladdr_seq_show(struct seq_file *s, void *v)
980{
981 struct list_head *list = v;
982 struct smk_netlbladdr *skp =
983 list_entry(list, struct smk_netlbladdr, list);
984 unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
985 int maskn;
986 u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
987
988 for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++);
989
990 seq_printf(s, "%u.%u.%u.%u/%d %s\n",
991 hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label);
992
993 return 0;
994}
995
996static const struct seq_operations netlbladdr_seq_ops = {
997 .start = netlbladdr_seq_start,
998 .next = netlbladdr_seq_next,
999 .show = netlbladdr_seq_show,
1000 .stop = smk_seq_stop,
1001};
1002
1003/**
1004 * smk_open_netlbladdr - open() for /smack/netlabel
1005 * @inode: inode structure representing file
1006 * @file: "netlabel" file pointer
1007 *
1008 * Connect our netlbladdr_seq_* operations with /smack/netlabel
1009 * file_operations
1010 */
1011static int smk_open_netlbladdr(struct inode *inode, struct file *file)
1012{
1013 return seq_open(file, &netlbladdr_seq_ops);
1014}
1015
1016/**
1017 * smk_netlbladdr_insert
1018 * @new : netlabel to insert
1019 *
1020 * This helper insert netlabel in the smack_netlbladdrs list
1021 * sorted by netmask length (longest to smallest)
1022 * locked by &smk_netlbladdr_lock in smk_write_netlbladdr
1023 *
1024 */
1025static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
1026{
1027 struct smk_netlbladdr *m, *m_next;
1028
1029 if (list_empty(&smk_netlbladdr_list)) {
1030 list_add_rcu(&new->list, &smk_netlbladdr_list);
1031 return;
1032 }
1033
1034 m = list_entry_rcu(smk_netlbladdr_list.next,
1035 struct smk_netlbladdr, list);
1036
1037 /* the comparison '>' is a bit hacky, but works */
1038 if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
1039 list_add_rcu(&new->list, &smk_netlbladdr_list);
1040 return;
1041 }
1042
1043 list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
1044 if (list_is_last(&m->list, &smk_netlbladdr_list)) {
1045 list_add_rcu(&new->list, &m->list);
1046 return;
1047 }
1048 m_next = list_entry_rcu(m->list.next,
1049 struct smk_netlbladdr, list);
1050 if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
1051 list_add_rcu(&new->list, &m->list);
1052 return;
1053 }
1054 }
1055}
1056
1057
1058/**
1059 * smk_write_netlbladdr - write() for /smack/netlabel
1060 * @file: file pointer, not actually used
1061 * @buf: where to get the data from
1062 * @count: bytes sent
1063 * @ppos: where to start
1064 *
1065 * Accepts only one netlbladdr per write call.
1066 * Returns number of bytes written or error code, as appropriate
1067 */
1068static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
1069 size_t count, loff_t *ppos)
1070{
1071 struct smk_netlbladdr *skp;
1072 struct sockaddr_in newname;
1073 char *smack;
1074 char *sp;
1075 char *data;
1076 char *host = (char *)&newname.sin_addr.s_addr;
1077 int rc;
1078 struct netlbl_audit audit_info;
1079 struct in_addr mask;
1080 unsigned int m;
1081 int found;
1082 u32 mask_bits = (1<<31);
1083 __be32 nsa;
1084 u32 temp_mask;
1085
1086 /*
1087 * Must have privilege.
1088 * No partial writes.
1089 * Enough data must be present.
1090 * "<addr/mask, as a.b.c.d/e><space><label>"
1091 * "<addr, as a.b.c.d><space><label>"
1092 */
1093 if (!capable(CAP_MAC_ADMIN))
1094 return -EPERM;
1095 if (*ppos != 0)
1096 return -EINVAL;
1097 if (count < SMK_NETLBLADDRMIN)
1098 return -EINVAL;
1099
1100 data = kzalloc(count + 1, GFP_KERNEL);
1101 if (data == NULL)
1102 return -ENOMEM;
1103
1104 if (copy_from_user(data, buf, count) != 0) {
1105 rc = -EFAULT;
1106 goto free_data_out;
1107 }
1108
1109 smack = kzalloc(count + 1, GFP_KERNEL);
1110 if (smack == NULL) {
1111 rc = -ENOMEM;
1112 goto free_data_out;
1113 }
1114
1115 data[count] = '\0';
1116
1117 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
1118 &host[0], &host[1], &host[2], &host[3], &m, smack);
1119 if (rc != 6) {
1120 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1121 &host[0], &host[1], &host[2], &host[3], smack);
1122 if (rc != 5) {
1123 rc = -EINVAL;
1124 goto free_out;
1125 }
1126 m = BEBITS;
1127 }
1128 if (m > BEBITS) {
1129 rc = -EINVAL;
1130 goto free_out;
1131 }
1132
1133 /*
1134 * If smack begins with '-', it is an option, don't import it
1135 */
1136 if (smack[0] != '-') {
1137 sp = smk_import(smack, 0);
1138 if (sp == NULL) {
1139 rc = -EINVAL;
1140 goto free_out;
1141 }
1142 } else {
1143 /* check known options */
1144 if (strcmp(smack, smack_cipso_option) == 0)
1145 sp = (char *)smack_cipso_option;
1146 else {
1147 rc = -EINVAL;
1148 goto free_out;
1149 }
1150 }
1151
1152 for (temp_mask = 0; m > 0; m--) {
1153 temp_mask |= mask_bits;
1154 mask_bits >>= 1;
1155 }
1156 mask.s_addr = cpu_to_be32(temp_mask);
1157
1158 newname.sin_addr.s_addr &= mask.s_addr;
1159 /*
1160 * Only allow one writer at a time. Writes should be
1161 * quite rare and small in any case.
1162 */
1163 mutex_lock(&smk_netlbladdr_lock);
1164
1165 nsa = newname.sin_addr.s_addr;
1166 /* try to find if the prefix is already in the list */
1167 found = 0;
1168 list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) {
1169 if (skp->smk_host.sin_addr.s_addr == nsa &&
1170 skp->smk_mask.s_addr == mask.s_addr) {
1171 found = 1;
1172 break;
1173 }
1174 }
1175 smk_netlabel_audit_set(&audit_info);
1176
1177 if (found == 0) {
1178 skp = kzalloc(sizeof(*skp), GFP_KERNEL);
1179 if (skp == NULL)
1180 rc = -ENOMEM;
1181 else {
1182 rc = 0;
1183 skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
1184 skp->smk_mask.s_addr = mask.s_addr;
1185 skp->smk_label = sp;
1186 smk_netlbladdr_insert(skp);
1187 }
1188 } else {
1189 /* we delete the unlabeled entry, only if the previous label
1190 * wasn't the special CIPSO option */
1191 if (skp->smk_label != smack_cipso_option)
1192 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1193 &skp->smk_host.sin_addr, &skp->smk_mask,
1194 PF_INET, &audit_info);
1195 else
1196 rc = 0;
1197 skp->smk_label = sp;
1198 }
1199
1200 /*
1201 * Now tell netlabel about the single label nature of
1202 * this host so that incoming packets get labeled.
1203 * but only if we didn't get the special CIPSO option
1204 */
1205 if (rc == 0 && sp != smack_cipso_option)
1206 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1207 &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
1208 smack_to_secid(skp->smk_label), &audit_info);
1209
1210 if (rc == 0)
1211 rc = count;
1212
1213 mutex_unlock(&smk_netlbladdr_lock);
1214
1215free_out:
1216 kfree(smack);
1217free_data_out:
1218 kfree(data);
1219
1220 return rc;
1221}
1222
1223static const struct file_operations smk_netlbladdr_ops = {
1224 .open = smk_open_netlbladdr,
1225 .read = seq_read,
1226 .llseek = seq_lseek,
1227 .write = smk_write_netlbladdr,
1228 .release = seq_release,
1229};
1230
1231/**
1232 * smk_read_doi - read() for /smack/doi
1233 * @filp: file pointer, not actually used
1234 * @buf: where to put the result
1235 * @count: maximum to send along
1236 * @ppos: where to start
1237 *
1238 * Returns number of bytes read or error code, as appropriate
1239 */
1240static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1241 size_t count, loff_t *ppos)
1242{
1243 char temp[80];
1244 ssize_t rc;
1245
1246 if (*ppos != 0)
1247 return 0;
1248
1249 sprintf(temp, "%d", smk_cipso_doi_value);
1250 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1251
1252 return rc;
1253}
1254
1255/**
1256 * smk_write_doi - write() for /smack/doi
1257 * @file: file pointer, not actually used
1258 * @buf: where to get the data from
1259 * @count: bytes sent
1260 * @ppos: where to start
1261 *
1262 * Returns number of bytes written or error code, as appropriate
1263 */
1264static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1265 size_t count, loff_t *ppos)
1266{
1267 char temp[80];
1268 int i;
1269
1270 if (!capable(CAP_MAC_ADMIN))
1271 return -EPERM;
1272
1273 if (count >= sizeof(temp) || count == 0)
1274 return -EINVAL;
1275
1276 if (copy_from_user(temp, buf, count) != 0)
1277 return -EFAULT;
1278
1279 temp[count] = '\0';
1280
1281 if (sscanf(temp, "%d", &i) != 1)
1282 return -EINVAL;
1283
1284 smk_cipso_doi_value = i;
1285
1286 smk_cipso_doi();
1287
1288 return count;
1289}
1290
1291static const struct file_operations smk_doi_ops = {
1292 .read = smk_read_doi,
1293 .write = smk_write_doi,
1294 .llseek = default_llseek,
1295};
1296
1297/**
1298 * smk_read_direct - read() for /smack/direct
1299 * @filp: file pointer, not actually used
1300 * @buf: where to put the result
1301 * @count: maximum to send along
1302 * @ppos: where to start
1303 *
1304 * Returns number of bytes read or error code, as appropriate
1305 */
1306static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1307 size_t count, loff_t *ppos)
1308{
1309 char temp[80];
1310 ssize_t rc;
1311
1312 if (*ppos != 0)
1313 return 0;
1314
1315 sprintf(temp, "%d", smack_cipso_direct);
1316 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1317
1318 return rc;
1319}
1320
1321/**
1322 * smk_write_direct - write() for /smack/direct
1323 * @file: file pointer, not actually used
1324 * @buf: where to get the data from
1325 * @count: bytes sent
1326 * @ppos: where to start
1327 *
1328 * Returns number of bytes written or error code, as appropriate
1329 */
1330static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1331 size_t count, loff_t *ppos)
1332{
1333 struct smack_known *skp;
1334 char temp[80];
1335 int i;
1336
1337 if (!capable(CAP_MAC_ADMIN))
1338 return -EPERM;
1339
1340 if (count >= sizeof(temp) || count == 0)
1341 return -EINVAL;
1342
1343 if (copy_from_user(temp, buf, count) != 0)
1344 return -EFAULT;
1345
1346 temp[count] = '\0';
1347
1348 if (sscanf(temp, "%d", &i) != 1)
1349 return -EINVAL;
1350
1351 /*
1352 * Don't do anything if the value hasn't actually changed.
1353 * If it is changing reset the level on entries that were
1354 * set up to be direct when they were created.
1355 */
1356 if (smack_cipso_direct != i) {
1357 mutex_lock(&smack_known_lock);
1358 list_for_each_entry_rcu(skp, &smack_known_list, list)
1359 if (skp->smk_netlabel.attr.mls.lvl ==
1360 smack_cipso_direct)
1361 skp->smk_netlabel.attr.mls.lvl = i;
1362 smack_cipso_direct = i;
1363 mutex_unlock(&smack_known_lock);
1364 }
1365
1366 return count;
1367}
1368
1369static const struct file_operations smk_direct_ops = {
1370 .read = smk_read_direct,
1371 .write = smk_write_direct,
1372 .llseek = default_llseek,
1373};
1374
1375/**
1376 * smk_read_mapped - read() for /smack/mapped
1377 * @filp: file pointer, not actually used
1378 * @buf: where to put the result
1379 * @count: maximum to send along
1380 * @ppos: where to start
1381 *
1382 * Returns number of bytes read or error code, as appropriate
1383 */
1384static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1385 size_t count, loff_t *ppos)
1386{
1387 char temp[80];
1388 ssize_t rc;
1389
1390 if (*ppos != 0)
1391 return 0;
1392
1393 sprintf(temp, "%d", smack_cipso_mapped);
1394 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1395
1396 return rc;
1397}
1398
1399/**
1400 * smk_write_mapped - write() for /smack/mapped
1401 * @file: file pointer, not actually used
1402 * @buf: where to get the data from
1403 * @count: bytes sent
1404 * @ppos: where to start
1405 *
1406 * Returns number of bytes written or error code, as appropriate
1407 */
1408static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1409 size_t count, loff_t *ppos)
1410{
1411 struct smack_known *skp;
1412 char temp[80];
1413 int i;
1414
1415 if (!capable(CAP_MAC_ADMIN))
1416 return -EPERM;
1417
1418 if (count >= sizeof(temp) || count == 0)
1419 return -EINVAL;
1420
1421 if (copy_from_user(temp, buf, count) != 0)
1422 return -EFAULT;
1423
1424 temp[count] = '\0';
1425
1426 if (sscanf(temp, "%d", &i) != 1)
1427 return -EINVAL;
1428
1429 /*
1430 * Don't do anything if the value hasn't actually changed.
1431 * If it is changing reset the level on entries that were
1432 * set up to be mapped when they were created.
1433 */
1434 if (smack_cipso_mapped != i) {
1435 mutex_lock(&smack_known_lock);
1436 list_for_each_entry_rcu(skp, &smack_known_list, list)
1437 if (skp->smk_netlabel.attr.mls.lvl ==
1438 smack_cipso_mapped)
1439 skp->smk_netlabel.attr.mls.lvl = i;
1440 smack_cipso_mapped = i;
1441 mutex_unlock(&smack_known_lock);
1442 }
1443
1444 return count;
1445}
1446
1447static const struct file_operations smk_mapped_ops = {
1448 .read = smk_read_mapped,
1449 .write = smk_write_mapped,
1450 .llseek = default_llseek,
1451};
1452
1453/**
1454 * smk_read_ambient - read() for /smack/ambient
1455 * @filp: file pointer, not actually used
1456 * @buf: where to put the result
1457 * @cn: maximum to send along
1458 * @ppos: where to start
1459 *
1460 * Returns number of bytes read or error code, as appropriate
1461 */
1462static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1463 size_t cn, loff_t *ppos)
1464{
1465 ssize_t rc;
1466 int asize;
1467
1468 if (*ppos != 0)
1469 return 0;
1470 /*
1471 * Being careful to avoid a problem in the case where
1472 * smack_net_ambient gets changed in midstream.
1473 */
1474 mutex_lock(&smack_ambient_lock);
1475
1476 asize = strlen(smack_net_ambient) + 1;
1477
1478 if (cn >= asize)
1479 rc = simple_read_from_buffer(buf, cn, ppos,
1480 smack_net_ambient, asize);
1481 else
1482 rc = -EINVAL;
1483
1484 mutex_unlock(&smack_ambient_lock);
1485
1486 return rc;
1487}
1488
1489/**
1490 * smk_write_ambient - write() for /smack/ambient
1491 * @file: file pointer, not actually used
1492 * @buf: where to get the data from
1493 * @count: bytes sent
1494 * @ppos: where to start
1495 *
1496 * Returns number of bytes written or error code, as appropriate
1497 */
1498static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1499 size_t count, loff_t *ppos)
1500{
1501 char *oldambient;
1502 char *smack = NULL;
1503 char *data;
1504 int rc = count;
1505
1506 if (!capable(CAP_MAC_ADMIN))
1507 return -EPERM;
1508
1509 data = kzalloc(count + 1, GFP_KERNEL);
1510 if (data == NULL)
1511 return -ENOMEM;
1512
1513 if (copy_from_user(data, buf, count) != 0) {
1514 rc = -EFAULT;
1515 goto out;
1516 }
1517
1518 smack = smk_import(data, count);
1519 if (smack == NULL) {
1520 rc = -EINVAL;
1521 goto out;
1522 }
1523
1524 mutex_lock(&smack_ambient_lock);
1525
1526 oldambient = smack_net_ambient;
1527 smack_net_ambient = smack;
1528 smk_unlbl_ambient(oldambient);
1529
1530 mutex_unlock(&smack_ambient_lock);
1531
1532out:
1533 kfree(data);
1534 return rc;
1535}
1536
1537static const struct file_operations smk_ambient_ops = {
1538 .read = smk_read_ambient,
1539 .write = smk_write_ambient,
1540 .llseek = default_llseek,
1541};
1542
1543/**
1544 * smk_read_onlycap - read() for /smack/onlycap
1545 * @filp: file pointer, not actually used
1546 * @buf: where to put the result
1547 * @cn: maximum to send along
1548 * @ppos: where to start
1549 *
1550 * Returns number of bytes read or error code, as appropriate
1551 */
1552static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
1553 size_t cn, loff_t *ppos)
1554{
1555 char *smack = "";
1556 ssize_t rc = -EINVAL;
1557 int asize;
1558
1559 if (*ppos != 0)
1560 return 0;
1561
1562 if (smack_onlycap != NULL)
1563 smack = smack_onlycap;
1564
1565 asize = strlen(smack) + 1;
1566
1567 if (cn >= asize)
1568 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
1569
1570 return rc;
1571}
1572
1573/**
1574 * smk_write_onlycap - write() for /smack/onlycap
1575 * @file: file pointer, not actually used
1576 * @buf: where to get the data from
1577 * @count: bytes sent
1578 * @ppos: where to start
1579 *
1580 * Returns number of bytes written or error code, as appropriate
1581 */
1582static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1583 size_t count, loff_t *ppos)
1584{
1585 char *data;
1586 char *sp = smk_of_task(current->cred->security);
1587 int rc = count;
1588
1589 if (!capable(CAP_MAC_ADMIN))
1590 return -EPERM;
1591
1592 /*
1593 * This can be done using smk_access() but is done
1594 * explicitly for clarity. The smk_access() implementation
1595 * would use smk_access(smack_onlycap, MAY_WRITE)
1596 */
1597 if (smack_onlycap != NULL && smack_onlycap != sp)
1598 return -EPERM;
1599
1600 data = kzalloc(count, GFP_KERNEL);
1601 if (data == NULL)
1602 return -ENOMEM;
1603
1604 /*
1605 * Should the null string be passed in unset the onlycap value.
1606 * This seems like something to be careful with as usually
1607 * smk_import only expects to return NULL for errors. It
1608 * is usually the case that a nullstring or "\n" would be
1609 * bad to pass to smk_import but in fact this is useful here.
1610 *
1611 * smk_import will also reject a label beginning with '-',
1612 * so "-usecapabilities" will also work.
1613 */
1614 if (copy_from_user(data, buf, count) != 0)
1615 rc = -EFAULT;
1616 else
1617 smack_onlycap = smk_import(data, count);
1618
1619 kfree(data);
1620 return rc;
1621}
1622
1623static const struct file_operations smk_onlycap_ops = {
1624 .read = smk_read_onlycap,
1625 .write = smk_write_onlycap,
1626 .llseek = default_llseek,
1627};
1628
1629/**
1630 * smk_read_logging - read() for /smack/logging
1631 * @filp: file pointer, not actually used
1632 * @buf: where to put the result
1633 * @cn: 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_logging(struct file *filp, char __user *buf,
1639 size_t count, loff_t *ppos)
1640{
1641 char temp[32];
1642 ssize_t rc;
1643
1644 if (*ppos != 0)
1645 return 0;
1646
1647 sprintf(temp, "%d\n", log_policy);
1648 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1649 return rc;
1650}
1651
1652/**
1653 * smk_write_logging - write() for /smack/logging
1654 * @file: file pointer, not actually used
1655 * @buf: where to get the data from
1656 * @count: bytes sent
1657 * @ppos: where to start
1658 *
1659 * Returns number of bytes written or error code, as appropriate
1660 */
1661static ssize_t smk_write_logging(struct file *file, const char __user *buf,
1662 size_t count, loff_t *ppos)
1663{
1664 char temp[32];
1665 int i;
1666
1667 if (!capable(CAP_MAC_ADMIN))
1668 return -EPERM;
1669
1670 if (count >= sizeof(temp) || count == 0)
1671 return -EINVAL;
1672
1673 if (copy_from_user(temp, buf, count) != 0)
1674 return -EFAULT;
1675
1676 temp[count] = '\0';
1677
1678 if (sscanf(temp, "%d", &i) != 1)
1679 return -EINVAL;
1680 if (i < 0 || i > 3)
1681 return -EINVAL;
1682 log_policy = i;
1683 return count;
1684}
1685
1686
1687
1688static const struct file_operations smk_logging_ops = {
1689 .read = smk_read_logging,
1690 .write = smk_write_logging,
1691 .llseek = default_llseek,
1692};
1693
1694/*
1695 * Seq_file read operations for /smack/load-self
1696 */
1697
1698static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
1699{
1700 struct task_smack *tsp = current_security();
1701
1702 return smk_seq_start(s, pos, &tsp->smk_rules);
1703}
1704
1705static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
1706{
1707 struct task_smack *tsp = current_security();
1708
1709 return smk_seq_next(s, v, pos, &tsp->smk_rules);
1710}
1711
1712static int load_self_seq_show(struct seq_file *s, void *v)
1713{
1714 struct list_head *list = v;
1715 struct smack_rule *srp =
1716 list_entry(list, struct smack_rule, list);
1717
1718 smk_rule_show(s, srp, SMK_LABELLEN);
1719
1720 return 0;
1721}
1722
1723static const struct seq_operations load_self_seq_ops = {
1724 .start = load_self_seq_start,
1725 .next = load_self_seq_next,
1726 .show = load_self_seq_show,
1727 .stop = smk_seq_stop,
1728};
1729
1730
1731/**
1732 * smk_open_load_self - open() for /smack/load-self2
1733 * @inode: inode structure representing file
1734 * @file: "load" file pointer
1735 *
1736 * For reading, use load_seq_* seq_file reading operations.
1737 */
1738static int smk_open_load_self(struct inode *inode, struct file *file)
1739{
1740 return seq_open(file, &load_self_seq_ops);
1741}
1742
1743/**
1744 * smk_write_load_self - write() for /smack/load-self
1745 * @file: file pointer, not actually used
1746 * @buf: where to get the data from
1747 * @count: bytes sent
1748 * @ppos: where to start - must be 0
1749 *
1750 */
1751static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
1752 size_t count, loff_t *ppos)
1753{
1754 struct task_smack *tsp = current_security();
1755
1756 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
1757 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
1758}
1759
1760static const struct file_operations smk_load_self_ops = {
1761 .open = smk_open_load_self,
1762 .read = seq_read,
1763 .llseek = seq_lseek,
1764 .write = smk_write_load_self,
1765 .release = seq_release,
1766};
1767
1768/**
1769 * smk_user_access - handle access check transaction
1770 * @file: file pointer
1771 * @buf: data from user space
1772 * @count: bytes sent
1773 * @ppos: where to start - must be 0
1774 */
1775static ssize_t smk_user_access(struct file *file, const char __user *buf,
1776 size_t count, loff_t *ppos, int format)
1777{
1778 struct smack_rule rule;
1779 char *data;
1780 char *cod;
1781 int res;
1782
1783 data = simple_transaction_get(file, buf, count);
1784 if (IS_ERR(data))
1785 return PTR_ERR(data);
1786
1787 if (format == SMK_FIXED24_FMT) {
1788 if (count < SMK_LOADLEN)
1789 return -EINVAL;
1790 res = smk_parse_rule(data, &rule, 0);
1791 } else {
1792 /*
1793 * Copy the data to make sure the string is terminated.
1794 */
1795 cod = kzalloc(count + 1, GFP_KERNEL);
1796 if (cod == NULL)
1797 return -ENOMEM;
1798 memcpy(cod, data, count);
1799 cod[count] = '\0';
1800 res = smk_parse_long_rule(cod, &rule, 0);
1801 kfree(cod);
1802 }
1803
1804 if (res)
1805 return -EINVAL;
1806
1807 res = smk_access(rule.smk_subject, rule.smk_object, rule.smk_access,
1808 NULL);
1809 data[0] = res == 0 ? '1' : '0';
1810 data[1] = '\0';
1811
1812 simple_transaction_set(file, 2);
1813
1814 if (format == SMK_FIXED24_FMT)
1815 return SMK_LOADLEN;
1816 return count;
1817}
1818
1819/**
1820 * smk_write_access - handle access check transaction
1821 * @file: file pointer
1822 * @buf: data from user space
1823 * @count: bytes sent
1824 * @ppos: where to start - must be 0
1825 */
1826static ssize_t smk_write_access(struct file *file, const char __user *buf,
1827 size_t count, loff_t *ppos)
1828{
1829 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
1830}
1831
1832static const struct file_operations smk_access_ops = {
1833 .write = smk_write_access,
1834 .read = simple_transaction_read,
1835 .release = simple_transaction_release,
1836 .llseek = generic_file_llseek,
1837};
1838
1839
1840/*
1841 * Seq_file read operations for /smack/load2
1842 */
1843
1844static int load2_seq_show(struct seq_file *s, void *v)
1845{
1846 struct list_head *list = v;
1847 struct smack_master_list *smlp =
1848 list_entry(list, struct smack_master_list, list);
1849
1850 smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);
1851
1852 return 0;
1853}
1854
1855static const struct seq_operations load2_seq_ops = {
1856 .start = load2_seq_start,
1857 .next = load2_seq_next,
1858 .show = load2_seq_show,
1859 .stop = smk_seq_stop,
1860};
1861
1862/**
1863 * smk_open_load2 - open() for /smack/load2
1864 * @inode: inode structure representing file
1865 * @file: "load2" file pointer
1866 *
1867 * For reading, use load2_seq_* seq_file reading operations.
1868 */
1869static int smk_open_load2(struct inode *inode, struct file *file)
1870{
1871 return seq_open(file, &load2_seq_ops);
1872}
1873
1874/**
1875 * smk_write_load2 - write() for /smack/load2
1876 * @file: file pointer, not actually used
1877 * @buf: where to get the data from
1878 * @count: bytes sent
1879 * @ppos: where to start - must be 0
1880 *
1881 */
1882static ssize_t smk_write_load2(struct file *file, const char __user *buf,
1883 size_t count, loff_t *ppos)
1884{
1885 /*
1886 * Must have privilege.
1887 */
1888 if (!capable(CAP_MAC_ADMIN))
1889 return -EPERM;
1890
1891 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
1892 SMK_LONG_FMT);
1893}
1894
1895static const struct file_operations smk_load2_ops = {
1896 .open = smk_open_load2,
1897 .read = seq_read,
1898 .llseek = seq_lseek,
1899 .write = smk_write_load2,
1900 .release = seq_release,
1901};
1902
1903/*
1904 * Seq_file read operations for /smack/load-self2
1905 */
1906
1907static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
1908{
1909 struct task_smack *tsp = current_security();
1910
1911 return smk_seq_start(s, pos, &tsp->smk_rules);
1912}
1913
1914static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
1915{
1916 struct task_smack *tsp = current_security();
1917
1918 return smk_seq_next(s, v, pos, &tsp->smk_rules);
1919}
1920
1921static int load_self2_seq_show(struct seq_file *s, void *v)
1922{
1923 struct list_head *list = v;
1924 struct smack_rule *srp =
1925 list_entry(list, struct smack_rule, list);
1926
1927 smk_rule_show(s, srp, SMK_LONGLABEL);
1928
1929 return 0;
1930}
1931
1932static const struct seq_operations load_self2_seq_ops = {
1933 .start = load_self2_seq_start,
1934 .next = load_self2_seq_next,
1935 .show = load_self2_seq_show,
1936 .stop = smk_seq_stop,
1937};
1938
1939/**
1940 * smk_open_load_self2 - open() for /smack/load-self2
1941 * @inode: inode structure representing file
1942 * @file: "load" file pointer
1943 *
1944 * For reading, use load_seq_* seq_file reading operations.
1945 */
1946static int smk_open_load_self2(struct inode *inode, struct file *file)
1947{
1948 return seq_open(file, &load_self2_seq_ops);
1949}
1950
1951/**
1952 * smk_write_load_self2 - write() for /smack/load-self2
1953 * @file: file pointer, not actually used
1954 * @buf: where to get the data from
1955 * @count: bytes sent
1956 * @ppos: where to start - must be 0
1957 *
1958 */
1959static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
1960 size_t count, loff_t *ppos)
1961{
1962 struct task_smack *tsp = current_security();
1963
1964 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
1965 &tsp->smk_rules_lock, SMK_LONG_FMT);
1966}
1967
1968static const struct file_operations smk_load_self2_ops = {
1969 .open = smk_open_load_self2,
1970 .read = seq_read,
1971 .llseek = seq_lseek,
1972 .write = smk_write_load_self2,
1973 .release = seq_release,
1974};
1975
1976/**
1977 * smk_write_access2 - handle access check transaction
1978 * @file: file pointer
1979 * @buf: data from user space
1980 * @count: bytes sent
1981 * @ppos: where to start - must be 0
1982 */
1983static ssize_t smk_write_access2(struct file *file, const char __user *buf,
1984 size_t count, loff_t *ppos)
1985{
1986 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
1987}
1988
1989static const struct file_operations smk_access2_ops = {
1990 .write = smk_write_access2,
1991 .read = simple_transaction_read,
1992 .release = simple_transaction_release,
1993 .llseek = generic_file_llseek,
1994};
1995
1996/**
1997 * smk_fill_super - fill the /smackfs superblock
1998 * @sb: the empty superblock
1999 * @data: unused
2000 * @silent: unused
2001 *
2002 * Fill in the well known entries for /smack
2003 *
2004 * Returns 0 on success, an error code on failure
2005 */
2006static int smk_fill_super(struct super_block *sb, void *data, int silent)
2007{
2008 int rc;
2009 struct inode *root_inode;
2010
2011 static struct tree_descr smack_files[] = {
2012 [SMK_LOAD] = {
2013 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2014 [SMK_CIPSO] = {
2015 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2016 [SMK_DOI] = {
2017 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2018 [SMK_DIRECT] = {
2019 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2020 [SMK_AMBIENT] = {
2021 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2022 [SMK_NETLBLADDR] = {
2023 "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
2024 [SMK_ONLYCAP] = {
2025 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2026 [SMK_LOGGING] = {
2027 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2028 [SMK_LOAD_SELF] = {
2029 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2030 [SMK_ACCESSES] = {
2031 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2032 [SMK_MAPPED] = {
2033 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2034 [SMK_LOAD2] = {
2035 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2036 [SMK_LOAD_SELF2] = {
2037 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2038 [SMK_ACCESS2] = {
2039 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2040 [SMK_CIPSO2] = {
2041 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2042 /* last one */
2043 {""}
2044 };
2045
2046 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2047 if (rc != 0) {
2048 printk(KERN_ERR "%s failed %d while creating inodes\n",
2049 __func__, rc);
2050 return rc;
2051 }
2052
2053 root_inode = sb->s_root->d_inode;
2054 root_inode->i_security = new_inode_smack(smack_known_floor.smk_known);
2055
2056 return 0;
2057}
2058
2059/**
2060 * smk_mount - get the smackfs superblock
2061 * @fs_type: passed along without comment
2062 * @flags: passed along without comment
2063 * @dev_name: passed along without comment
2064 * @data: passed along without comment
2065 *
2066 * Just passes everything along.
2067 *
2068 * Returns what the lower level code does.
2069 */
2070static struct dentry *smk_mount(struct file_system_type *fs_type,
2071 int flags, const char *dev_name, void *data)
2072{
2073 return mount_single(fs_type, flags, data, smk_fill_super);
2074}
2075
2076static struct file_system_type smk_fs_type = {
2077 .name = "smackfs",
2078 .mount = smk_mount,
2079 .kill_sb = kill_litter_super,
2080};
2081
2082static struct vfsmount *smackfs_mount;
2083
2084static int __init smk_preset_netlabel(struct smack_known *skp)
2085{
2086 skp->smk_netlabel.domain = skp->smk_known;
2087 skp->smk_netlabel.flags =
2088 NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2089 return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2090 &skp->smk_netlabel, strlen(skp->smk_known));
2091}
2092
2093/**
2094 * init_smk_fs - get the smackfs superblock
2095 *
2096 * register the smackfs
2097 *
2098 * Do not register smackfs if Smack wasn't enabled
2099 * on boot. We can not put this method normally under the
2100 * smack_init() code path since the security subsystem get
2101 * initialized before the vfs caches.
2102 *
2103 * Returns true if we were not chosen on boot or if
2104 * we were chosen and filesystem registration succeeded.
2105 */
2106static int __init init_smk_fs(void)
2107{
2108 int err;
2109 int rc;
2110
2111 if (!security_module_enable(&smack_ops))
2112 return 0;
2113
2114 err = register_filesystem(&smk_fs_type);
2115 if (!err) {
2116 smackfs_mount = kern_mount(&smk_fs_type);
2117 if (IS_ERR(smackfs_mount)) {
2118 printk(KERN_ERR "smackfs: could not mount!\n");
2119 err = PTR_ERR(smackfs_mount);
2120 smackfs_mount = NULL;
2121 }
2122 }
2123
2124 smk_cipso_doi();
2125 smk_unlbl_ambient(NULL);
2126
2127 rc = smk_preset_netlabel(&smack_known_floor);
2128 if (err == 0 && rc < 0)
2129 err = rc;
2130 rc = smk_preset_netlabel(&smack_known_hat);
2131 if (err == 0 && rc < 0)
2132 err = rc;
2133 rc = smk_preset_netlabel(&smack_known_huh);
2134 if (err == 0 && rc < 0)
2135 err = rc;
2136 rc = smk_preset_netlabel(&smack_known_invalid);
2137 if (err == 0 && rc < 0)
2138 err = rc;
2139 rc = smk_preset_netlabel(&smack_known_star);
2140 if (err == 0 && rc < 0)
2141 err = rc;
2142 rc = smk_preset_netlabel(&smack_known_web);
2143 if (err == 0 && rc < 0)
2144 err = rc;
2145
2146 return err;
2147}
2148
2149__initcall(init_smk_fs);