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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
4 *
5 * Authors:
6 * Casey Schaufler <casey@schaufler-ca.com>
7 * Ahmed S. Darwish <darwish.07@gmail.com>
8 *
9 * Special thanks to the authors of selinuxfs.
10 *
11 * Karl MacMillan <kmacmillan@tresys.com>
12 * James Morris <jmorris@redhat.com>
13 */
14
15#include <linux/kernel.h>
16#include <linux/vmalloc.h>
17#include <linux/security.h>
18#include <linux/mutex.h>
19#include <linux/slab.h>
20#include <net/net_namespace.h>
21#include <net/cipso_ipv4.h>
22#include <linux/seq_file.h>
23#include <linux/ctype.h>
24#include <linux/audit.h>
25#include <linux/magic.h>
26#include <linux/fs_context.h>
27#include "smack.h"
28
29#define BEBITS (sizeof(__be32) * 8)
30/*
31 * smackfs pseudo filesystem.
32 */
33
34enum smk_inos {
35 SMK_ROOT_INO = 2,
36 SMK_LOAD = 3, /* load policy */
37 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
38 SMK_DOI = 5, /* CIPSO DOI */
39 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
40 SMK_AMBIENT = 7, /* internet ambient label */
41 SMK_NET4ADDR = 8, /* single label hosts */
42 SMK_ONLYCAP = 9, /* the only "capable" label */
43 SMK_LOGGING = 10, /* logging */
44 SMK_LOAD_SELF = 11, /* task specific rules */
45 SMK_ACCESSES = 12, /* access policy */
46 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
47 SMK_LOAD2 = 14, /* load policy with long labels */
48 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
49 SMK_ACCESS2 = 16, /* make an access check with long labels */
50 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
51 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
52 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
53 SMK_SYSLOG = 20, /* change syslog label) */
54 SMK_PTRACE = 21, /* set ptrace rule */
55#ifdef CONFIG_SECURITY_SMACK_BRINGUP
56 SMK_UNCONFINED = 22, /* define an unconfined label */
57#endif
58#if IS_ENABLED(CONFIG_IPV6)
59 SMK_NET6ADDR = 23, /* single label IPv6 hosts */
60#endif /* CONFIG_IPV6 */
61 SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
62};
63
64/*
65 * List locks
66 */
67static DEFINE_MUTEX(smack_cipso_lock);
68static DEFINE_MUTEX(smack_ambient_lock);
69static DEFINE_MUTEX(smk_net4addr_lock);
70#if IS_ENABLED(CONFIG_IPV6)
71static DEFINE_MUTEX(smk_net6addr_lock);
72#endif /* CONFIG_IPV6 */
73
74/*
75 * This is the "ambient" label for network traffic.
76 * If it isn't somehow marked, use this.
77 * It can be reset via smackfs/ambient
78 */
79struct smack_known *smack_net_ambient;
80
81/*
82 * This is the level in a CIPSO header that indicates a
83 * smack label is contained directly in the category set.
84 * It can be reset via smackfs/direct
85 */
86int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
87
88/*
89 * This is the level in a CIPSO header that indicates a
90 * secid is contained directly in the category set.
91 * It can be reset via smackfs/mapped
92 */
93int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
94
95#ifdef CONFIG_SECURITY_SMACK_BRINGUP
96/*
97 * Allow one label to be unconfined. This is for
98 * debugging and application bring-up purposes only.
99 * It is bad and wrong, but everyone seems to expect
100 * to have it.
101 */
102struct smack_known *smack_unconfined;
103#endif
104
105/*
106 * If this value is set restrict syslog use to the label specified.
107 * It can be reset via smackfs/syslog
108 */
109struct smack_known *smack_syslog_label;
110
111/*
112 * Ptrace current rule
113 * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
114 * SMACK_PTRACE_EXACT labels must match, but can be overriden with
115 * CAP_SYS_PTRACE
116 * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect
117 */
118int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
119
120/*
121 * Certain IP addresses may be designated as single label hosts.
122 * Packets are sent there unlabeled, but only from tasks that
123 * can write to the specified label.
124 */
125
126LIST_HEAD(smk_net4addr_list);
127#if IS_ENABLED(CONFIG_IPV6)
128LIST_HEAD(smk_net6addr_list);
129#endif /* CONFIG_IPV6 */
130
131/*
132 * Rule lists are maintained for each label.
133 */
134struct smack_parsed_rule {
135 struct smack_known *smk_subject;
136 struct smack_known *smk_object;
137 int smk_access1;
138 int smk_access2;
139};
140
141static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
142
143/*
144 * Values for parsing cipso rules
145 * SMK_DIGITLEN: Length of a digit field in a rule.
146 * SMK_CIPSOMIN: Minimum possible cipso rule length.
147 * SMK_CIPSOMAX: Maximum possible cipso rule length.
148 */
149#define SMK_DIGITLEN 4
150#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
151#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
152
153/*
154 * Values for parsing MAC rules
155 * SMK_ACCESS: Maximum possible combination of access permissions
156 * SMK_ACCESSLEN: Maximum length for a rule access field
157 * SMK_LOADLEN: Smack rule length
158 */
159#define SMK_OACCESS "rwxa"
160#define SMK_ACCESS "rwxatl"
161#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
162#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
163#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
164#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
165
166/*
167 * Stricly for CIPSO level manipulation.
168 * Set the category bit number in a smack label sized buffer.
169 */
170static inline void smack_catset_bit(unsigned int cat, char *catsetp)
171{
172 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
173 return;
174
175 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
176}
177
178/**
179 * smk_netlabel_audit_set - fill a netlbl_audit struct
180 * @nap: structure to fill
181 */
182static void smk_netlabel_audit_set(struct netlbl_audit *nap)
183{
184 struct smack_known *skp = smk_of_current();
185
186 nap->loginuid = audit_get_loginuid(current);
187 nap->sessionid = audit_get_sessionid(current);
188 nap->secid = skp->smk_secid;
189}
190
191/*
192 * Value for parsing single label host rules
193 * "1.2.3.4 X"
194 */
195#define SMK_NETLBLADDRMIN 9
196
197/**
198 * smk_set_access - add a rule to the rule list or replace an old rule
199 * @srp: the rule to add or replace
200 * @rule_list: the list of rules
201 * @rule_lock: the rule list lock
202 *
203 * Looks through the current subject/object/access list for
204 * the subject/object pair and replaces the access that was
205 * there. If the pair isn't found add it with the specified
206 * access.
207 *
208 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
209 * during the allocation of the new pair to add.
210 */
211static int smk_set_access(struct smack_parsed_rule *srp,
212 struct list_head *rule_list,
213 struct mutex *rule_lock)
214{
215 struct smack_rule *sp;
216 int found = 0;
217 int rc = 0;
218
219 mutex_lock(rule_lock);
220
221 /*
222 * Because the object label is less likely to match
223 * than the subject label check it first
224 */
225 list_for_each_entry_rcu(sp, rule_list, list) {
226 if (sp->smk_object == srp->smk_object &&
227 sp->smk_subject == srp->smk_subject) {
228 found = 1;
229 sp->smk_access |= srp->smk_access1;
230 sp->smk_access &= ~srp->smk_access2;
231 break;
232 }
233 }
234
235 if (found == 0) {
236 sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL);
237 if (sp == NULL) {
238 rc = -ENOMEM;
239 goto out;
240 }
241
242 sp->smk_subject = srp->smk_subject;
243 sp->smk_object = srp->smk_object;
244 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
245
246 list_add_rcu(&sp->list, rule_list);
247 }
248
249out:
250 mutex_unlock(rule_lock);
251 return rc;
252}
253
254/**
255 * smk_perm_from_str - parse smack accesses from a text string
256 * @string: a text string that contains a Smack accesses code
257 *
258 * Returns an integer with respective bits set for specified accesses.
259 */
260static int smk_perm_from_str(const char *string)
261{
262 int perm = 0;
263 const char *cp;
264
265 for (cp = string; ; cp++)
266 switch (*cp) {
267 case '-':
268 break;
269 case 'r':
270 case 'R':
271 perm |= MAY_READ;
272 break;
273 case 'w':
274 case 'W':
275 perm |= MAY_WRITE;
276 break;
277 case 'x':
278 case 'X':
279 perm |= MAY_EXEC;
280 break;
281 case 'a':
282 case 'A':
283 perm |= MAY_APPEND;
284 break;
285 case 't':
286 case 'T':
287 perm |= MAY_TRANSMUTE;
288 break;
289 case 'l':
290 case 'L':
291 perm |= MAY_LOCK;
292 break;
293 case 'b':
294 case 'B':
295 perm |= MAY_BRINGUP;
296 break;
297 default:
298 return perm;
299 }
300}
301
302/**
303 * smk_fill_rule - Fill Smack rule from strings
304 * @subject: subject label string
305 * @object: object label string
306 * @access1: access string
307 * @access2: string with permissions to be removed
308 * @rule: Smack rule
309 * @import: if non-zero, import labels
310 * @len: label length limit
311 *
312 * Returns 0 on success, appropriate error code on failure.
313 */
314static int smk_fill_rule(const char *subject, const char *object,
315 const char *access1, const char *access2,
316 struct smack_parsed_rule *rule, int import,
317 int len)
318{
319 const char *cp;
320 struct smack_known *skp;
321
322 if (import) {
323 rule->smk_subject = smk_import_entry(subject, len);
324 if (IS_ERR(rule->smk_subject))
325 return PTR_ERR(rule->smk_subject);
326
327 rule->smk_object = smk_import_entry(object, len);
328 if (IS_ERR(rule->smk_object))
329 return PTR_ERR(rule->smk_object);
330 } else {
331 cp = smk_parse_smack(subject, len);
332 if (IS_ERR(cp))
333 return PTR_ERR(cp);
334 skp = smk_find_entry(cp);
335 kfree(cp);
336 if (skp == NULL)
337 return -ENOENT;
338 rule->smk_subject = skp;
339
340 cp = smk_parse_smack(object, len);
341 if (IS_ERR(cp))
342 return PTR_ERR(cp);
343 skp = smk_find_entry(cp);
344 kfree(cp);
345 if (skp == NULL)
346 return -ENOENT;
347 rule->smk_object = skp;
348 }
349
350 rule->smk_access1 = smk_perm_from_str(access1);
351 if (access2)
352 rule->smk_access2 = smk_perm_from_str(access2);
353 else
354 rule->smk_access2 = ~rule->smk_access1;
355
356 return 0;
357}
358
359/**
360 * smk_parse_rule - parse Smack rule from load string
361 * @data: string to be parsed whose size is SMK_LOADLEN
362 * @rule: Smack rule
363 * @import: if non-zero, import labels
364 *
365 * Returns 0 on success, -1 on errors.
366 */
367static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
368 int import)
369{
370 int rc;
371
372 rc = smk_fill_rule(data, data + SMK_LABELLEN,
373 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
374 import, SMK_LABELLEN);
375 return rc;
376}
377
378/**
379 * smk_parse_long_rule - parse Smack rule from rule string
380 * @data: string to be parsed, null terminated
381 * @rule: Will be filled with Smack parsed rule
382 * @import: if non-zero, import labels
383 * @tokens: numer of substrings expected in data
384 *
385 * Returns number of processed bytes on success, -ERRNO on failure.
386 */
387static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
388 int import, int tokens)
389{
390 ssize_t cnt = 0;
391 char *tok[4];
392 int rc;
393 int i;
394
395 /*
396 * Parsing the rule in-place, filling all white-spaces with '\0'
397 */
398 for (i = 0; i < tokens; ++i) {
399 while (isspace(data[cnt]))
400 data[cnt++] = '\0';
401
402 if (data[cnt] == '\0')
403 /* Unexpected end of data */
404 return -EINVAL;
405
406 tok[i] = data + cnt;
407
408 while (data[cnt] && !isspace(data[cnt]))
409 ++cnt;
410 }
411 while (isspace(data[cnt]))
412 data[cnt++] = '\0';
413
414 while (i < 4)
415 tok[i++] = NULL;
416
417 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
418 return rc == 0 ? cnt : rc;
419}
420
421#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
422#define SMK_LONG_FMT 1 /* Variable long label format */
423#define SMK_CHANGE_FMT 2 /* Rule modification format */
424/**
425 * smk_write_rules_list - write() for any /smack rule file
426 * @file: file pointer, not actually used
427 * @buf: where to get the data from
428 * @count: bytes sent
429 * @ppos: where to start - must be 0
430 * @rule_list: the list of rules to write to
431 * @rule_lock: lock for the rule list
432 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
433 *
434 * Get one smack access rule from above.
435 * The format for SMK_LONG_FMT is:
436 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
437 * The format for SMK_FIXED24_FMT is exactly:
438 * "subject object rwxat"
439 * The format for SMK_CHANGE_FMT is:
440 * "subject<whitespace>object<whitespace>
441 * acc_enable<whitespace>acc_disable[<whitespace>...]"
442 */
443static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
444 size_t count, loff_t *ppos,
445 struct list_head *rule_list,
446 struct mutex *rule_lock, int format)
447{
448 struct smack_parsed_rule rule;
449 char *data;
450 int rc;
451 int trunc = 0;
452 int tokens;
453 ssize_t cnt = 0;
454
455 /*
456 * No partial writes.
457 * Enough data must be present.
458 */
459 if (*ppos != 0)
460 return -EINVAL;
461
462 if (format == SMK_FIXED24_FMT) {
463 /*
464 * Minor hack for backward compatibility
465 */
466 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
467 return -EINVAL;
468 } else {
469 if (count >= PAGE_SIZE) {
470 count = PAGE_SIZE - 1;
471 trunc = 1;
472 }
473 }
474
475 data = memdup_user_nul(buf, count);
476 if (IS_ERR(data))
477 return PTR_ERR(data);
478
479 /*
480 * In case of parsing only part of user buf,
481 * avoid having partial rule at the data buffer
482 */
483 if (trunc) {
484 while (count > 0 && (data[count - 1] != '\n'))
485 --count;
486 if (count == 0) {
487 rc = -EINVAL;
488 goto out;
489 }
490 }
491
492 data[count] = '\0';
493 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
494 while (cnt < count) {
495 if (format == SMK_FIXED24_FMT) {
496 rc = smk_parse_rule(data, &rule, 1);
497 if (rc < 0)
498 goto out;
499 cnt = count;
500 } else {
501 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
502 if (rc < 0)
503 goto out;
504 if (rc == 0) {
505 rc = -EINVAL;
506 goto out;
507 }
508 cnt += rc;
509 }
510
511 if (rule_list == NULL)
512 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
513 &rule.smk_subject->smk_rules_lock);
514 else
515 rc = smk_set_access(&rule, rule_list, rule_lock);
516
517 if (rc)
518 goto out;
519 }
520
521 rc = cnt;
522out:
523 kfree(data);
524 return rc;
525}
526
527/*
528 * Core logic for smackfs seq list operations.
529 */
530
531static void *smk_seq_start(struct seq_file *s, loff_t *pos,
532 struct list_head *head)
533{
534 struct list_head *list;
535 int i = *pos;
536
537 rcu_read_lock();
538 for (list = rcu_dereference(list_next_rcu(head));
539 list != head;
540 list = rcu_dereference(list_next_rcu(list))) {
541 if (i-- == 0)
542 return list;
543 }
544
545 return NULL;
546}
547
548static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
549 struct list_head *head)
550{
551 struct list_head *list = v;
552
553 ++*pos;
554 list = rcu_dereference(list_next_rcu(list));
555
556 return (list == head) ? NULL : list;
557}
558
559static void smk_seq_stop(struct seq_file *s, void *v)
560{
561 rcu_read_unlock();
562}
563
564static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
565{
566 /*
567 * Don't show any rules with label names too long for
568 * interface file (/smack/load or /smack/load2)
569 * because you should expect to be able to write
570 * anything you read back.
571 */
572 if (strlen(srp->smk_subject->smk_known) >= max ||
573 strlen(srp->smk_object->smk_known) >= max)
574 return;
575
576 if (srp->smk_access == 0)
577 return;
578
579 seq_printf(s, "%s %s",
580 srp->smk_subject->smk_known,
581 srp->smk_object->smk_known);
582
583 seq_putc(s, ' ');
584
585 if (srp->smk_access & MAY_READ)
586 seq_putc(s, 'r');
587 if (srp->smk_access & MAY_WRITE)
588 seq_putc(s, 'w');
589 if (srp->smk_access & MAY_EXEC)
590 seq_putc(s, 'x');
591 if (srp->smk_access & MAY_APPEND)
592 seq_putc(s, 'a');
593 if (srp->smk_access & MAY_TRANSMUTE)
594 seq_putc(s, 't');
595 if (srp->smk_access & MAY_LOCK)
596 seq_putc(s, 'l');
597 if (srp->smk_access & MAY_BRINGUP)
598 seq_putc(s, 'b');
599
600 seq_putc(s, '\n');
601}
602
603/*
604 * Seq_file read operations for /smack/load
605 */
606
607static void *load2_seq_start(struct seq_file *s, loff_t *pos)
608{
609 return smk_seq_start(s, pos, &smack_known_list);
610}
611
612static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
613{
614 return smk_seq_next(s, v, pos, &smack_known_list);
615}
616
617static int load_seq_show(struct seq_file *s, void *v)
618{
619 struct list_head *list = v;
620 struct smack_rule *srp;
621 struct smack_known *skp =
622 list_entry_rcu(list, struct smack_known, list);
623
624 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
625 smk_rule_show(s, srp, SMK_LABELLEN);
626
627 return 0;
628}
629
630static const struct seq_operations load_seq_ops = {
631 .start = load2_seq_start,
632 .next = load2_seq_next,
633 .show = load_seq_show,
634 .stop = smk_seq_stop,
635};
636
637/**
638 * smk_open_load - open() for /smack/load
639 * @inode: inode structure representing file
640 * @file: "load" file pointer
641 *
642 * For reading, use load_seq_* seq_file reading operations.
643 */
644static int smk_open_load(struct inode *inode, struct file *file)
645{
646 return seq_open(file, &load_seq_ops);
647}
648
649/**
650 * smk_write_load - write() for /smack/load
651 * @file: file pointer, not actually used
652 * @buf: where to get the data from
653 * @count: bytes sent
654 * @ppos: where to start - must be 0
655 *
656 */
657static ssize_t smk_write_load(struct file *file, const char __user *buf,
658 size_t count, loff_t *ppos)
659{
660 /*
661 * Must have privilege.
662 * No partial writes.
663 * Enough data must be present.
664 */
665 if (!smack_privileged(CAP_MAC_ADMIN))
666 return -EPERM;
667
668 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
669 SMK_FIXED24_FMT);
670}
671
672static const struct file_operations smk_load_ops = {
673 .open = smk_open_load,
674 .read = seq_read,
675 .llseek = seq_lseek,
676 .write = smk_write_load,
677 .release = seq_release,
678};
679
680/**
681 * smk_cipso_doi - initialize the CIPSO domain
682 */
683static void smk_cipso_doi(void)
684{
685 int rc;
686 struct cipso_v4_doi *doip;
687 struct netlbl_audit nai;
688
689 smk_netlabel_audit_set(&nai);
690
691 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
692 if (rc != 0)
693 printk(KERN_WARNING "%s:%d remove rc = %d\n",
694 __func__, __LINE__, rc);
695
696 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
697 if (doip == NULL)
698 panic("smack: Failed to initialize cipso DOI.\n");
699 doip->map.std = NULL;
700 doip->doi = smk_cipso_doi_value;
701 doip->type = CIPSO_V4_MAP_PASS;
702 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
703 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
704 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
705
706 rc = netlbl_cfg_cipsov4_add(doip, &nai);
707 if (rc != 0) {
708 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
709 __func__, __LINE__, rc);
710 kfree(doip);
711 return;
712 }
713 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
714 if (rc != 0) {
715 printk(KERN_WARNING "%s:%d map add rc = %d\n",
716 __func__, __LINE__, rc);
717 kfree(doip);
718 return;
719 }
720}
721
722/**
723 * smk_unlbl_ambient - initialize the unlabeled domain
724 * @oldambient: previous domain string
725 */
726static void smk_unlbl_ambient(char *oldambient)
727{
728 int rc;
729 struct netlbl_audit nai;
730
731 smk_netlabel_audit_set(&nai);
732
733 if (oldambient != NULL) {
734 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
735 if (rc != 0)
736 printk(KERN_WARNING "%s:%d remove rc = %d\n",
737 __func__, __LINE__, rc);
738 }
739 if (smack_net_ambient == NULL)
740 smack_net_ambient = &smack_known_floor;
741
742 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
743 NULL, NULL, &nai);
744 if (rc != 0)
745 printk(KERN_WARNING "%s:%d add rc = %d\n",
746 __func__, __LINE__, rc);
747}
748
749/*
750 * Seq_file read operations for /smack/cipso
751 */
752
753static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
754{
755 return smk_seq_start(s, pos, &smack_known_list);
756}
757
758static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
759{
760 return smk_seq_next(s, v, pos, &smack_known_list);
761}
762
763/*
764 * Print cipso labels in format:
765 * label level[/cat[,cat]]
766 */
767static int cipso_seq_show(struct seq_file *s, void *v)
768{
769 struct list_head *list = v;
770 struct smack_known *skp =
771 list_entry_rcu(list, struct smack_known, list);
772 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
773 char sep = '/';
774 int i;
775
776 /*
777 * Don't show a label that could not have been set using
778 * /smack/cipso. This is in support of the notion that
779 * anything read from /smack/cipso ought to be writeable
780 * to /smack/cipso.
781 *
782 * /smack/cipso2 should be used instead.
783 */
784 if (strlen(skp->smk_known) >= SMK_LABELLEN)
785 return 0;
786
787 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
788
789 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
790 i = netlbl_catmap_walk(cmp, i + 1)) {
791 seq_printf(s, "%c%d", sep, i);
792 sep = ',';
793 }
794
795 seq_putc(s, '\n');
796
797 return 0;
798}
799
800static const struct seq_operations cipso_seq_ops = {
801 .start = cipso_seq_start,
802 .next = cipso_seq_next,
803 .show = cipso_seq_show,
804 .stop = smk_seq_stop,
805};
806
807/**
808 * smk_open_cipso - open() for /smack/cipso
809 * @inode: inode structure representing file
810 * @file: "cipso" file pointer
811 *
812 * Connect our cipso_seq_* operations with /smack/cipso
813 * file_operations
814 */
815static int smk_open_cipso(struct inode *inode, struct file *file)
816{
817 return seq_open(file, &cipso_seq_ops);
818}
819
820/**
821 * smk_set_cipso - do the work for write() for cipso and cipso2
822 * @file: file pointer, not actually used
823 * @buf: where to get the data from
824 * @count: bytes sent
825 * @ppos: where to start
826 * @format: /smack/cipso or /smack/cipso2
827 *
828 * Accepts only one cipso rule per write call.
829 * Returns number of bytes written or error code, as appropriate
830 */
831static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
832 size_t count, loff_t *ppos, int format)
833{
834 struct smack_known *skp;
835 struct netlbl_lsm_secattr ncats;
836 char mapcatset[SMK_CIPSOLEN];
837 int maplevel;
838 unsigned int cat;
839 int catlen;
840 ssize_t rc = -EINVAL;
841 char *data = NULL;
842 char *rule;
843 int ret;
844 int i;
845
846 /*
847 * Must have privilege.
848 * No partial writes.
849 * Enough data must be present.
850 */
851 if (!smack_privileged(CAP_MAC_ADMIN))
852 return -EPERM;
853 if (*ppos != 0)
854 return -EINVAL;
855 if (format == SMK_FIXED24_FMT &&
856 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
857 return -EINVAL;
858
859 data = memdup_user_nul(buf, count);
860 if (IS_ERR(data))
861 return PTR_ERR(data);
862
863 rule = data;
864 /*
865 * Only allow one writer at a time. Writes should be
866 * quite rare and small in any case.
867 */
868 mutex_lock(&smack_cipso_lock);
869
870 skp = smk_import_entry(rule, 0);
871 if (IS_ERR(skp)) {
872 rc = PTR_ERR(skp);
873 goto out;
874 }
875
876 if (format == SMK_FIXED24_FMT)
877 rule += SMK_LABELLEN;
878 else
879 rule += strlen(skp->smk_known) + 1;
880
881 ret = sscanf(rule, "%d", &maplevel);
882 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
883 goto out;
884
885 rule += SMK_DIGITLEN;
886 ret = sscanf(rule, "%d", &catlen);
887 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
888 goto out;
889
890 if (format == SMK_FIXED24_FMT &&
891 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
892 goto out;
893
894 memset(mapcatset, 0, sizeof(mapcatset));
895
896 for (i = 0; i < catlen; i++) {
897 rule += SMK_DIGITLEN;
898 ret = sscanf(rule, "%u", &cat);
899 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
900 goto out;
901
902 smack_catset_bit(cat, mapcatset);
903 }
904
905 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
906 if (rc >= 0) {
907 netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat);
908 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
909 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
910 rc = count;
911 }
912
913out:
914 mutex_unlock(&smack_cipso_lock);
915 kfree(data);
916 return rc;
917}
918
919/**
920 * smk_write_cipso - write() for /smack/cipso
921 * @file: file pointer, not actually used
922 * @buf: where to get the data from
923 * @count: bytes sent
924 * @ppos: where to start
925 *
926 * Accepts only one cipso rule per write call.
927 * Returns number of bytes written or error code, as appropriate
928 */
929static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
930 size_t count, loff_t *ppos)
931{
932 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
933}
934
935static const struct file_operations smk_cipso_ops = {
936 .open = smk_open_cipso,
937 .read = seq_read,
938 .llseek = seq_lseek,
939 .write = smk_write_cipso,
940 .release = seq_release,
941};
942
943/*
944 * Seq_file read operations for /smack/cipso2
945 */
946
947/*
948 * Print cipso labels in format:
949 * label level[/cat[,cat]]
950 */
951static int cipso2_seq_show(struct seq_file *s, void *v)
952{
953 struct list_head *list = v;
954 struct smack_known *skp =
955 list_entry_rcu(list, struct smack_known, list);
956 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
957 char sep = '/';
958 int i;
959
960 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
961
962 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
963 i = netlbl_catmap_walk(cmp, i + 1)) {
964 seq_printf(s, "%c%d", sep, i);
965 sep = ',';
966 }
967
968 seq_putc(s, '\n');
969
970 return 0;
971}
972
973static const struct seq_operations cipso2_seq_ops = {
974 .start = cipso_seq_start,
975 .next = cipso_seq_next,
976 .show = cipso2_seq_show,
977 .stop = smk_seq_stop,
978};
979
980/**
981 * smk_open_cipso2 - open() for /smack/cipso2
982 * @inode: inode structure representing file
983 * @file: "cipso2" file pointer
984 *
985 * Connect our cipso_seq_* operations with /smack/cipso2
986 * file_operations
987 */
988static int smk_open_cipso2(struct inode *inode, struct file *file)
989{
990 return seq_open(file, &cipso2_seq_ops);
991}
992
993/**
994 * smk_write_cipso2 - write() for /smack/cipso2
995 * @file: file pointer, not actually used
996 * @buf: where to get the data from
997 * @count: bytes sent
998 * @ppos: where to start
999 *
1000 * Accepts only one cipso rule per write call.
1001 * Returns number of bytes written or error code, as appropriate
1002 */
1003static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1004 size_t count, loff_t *ppos)
1005{
1006 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1007}
1008
1009static const struct file_operations smk_cipso2_ops = {
1010 .open = smk_open_cipso2,
1011 .read = seq_read,
1012 .llseek = seq_lseek,
1013 .write = smk_write_cipso2,
1014 .release = seq_release,
1015};
1016
1017/*
1018 * Seq_file read operations for /smack/netlabel
1019 */
1020
1021static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1022{
1023 return smk_seq_start(s, pos, &smk_net4addr_list);
1024}
1025
1026static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1027{
1028 return smk_seq_next(s, v, pos, &smk_net4addr_list);
1029}
1030
1031/*
1032 * Print host/label pairs
1033 */
1034static int net4addr_seq_show(struct seq_file *s, void *v)
1035{
1036 struct list_head *list = v;
1037 struct smk_net4addr *skp =
1038 list_entry_rcu(list, struct smk_net4addr, list);
1039 char *kp = SMACK_CIPSO_OPTION;
1040
1041 if (skp->smk_label != NULL)
1042 kp = skp->smk_label->smk_known;
1043 seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1044 skp->smk_masks, kp);
1045
1046 return 0;
1047}
1048
1049static const struct seq_operations net4addr_seq_ops = {
1050 .start = net4addr_seq_start,
1051 .next = net4addr_seq_next,
1052 .show = net4addr_seq_show,
1053 .stop = smk_seq_stop,
1054};
1055
1056/**
1057 * smk_open_net4addr - open() for /smack/netlabel
1058 * @inode: inode structure representing file
1059 * @file: "netlabel" file pointer
1060 *
1061 * Connect our net4addr_seq_* operations with /smack/netlabel
1062 * file_operations
1063 */
1064static int smk_open_net4addr(struct inode *inode, struct file *file)
1065{
1066 return seq_open(file, &net4addr_seq_ops);
1067}
1068
1069/**
1070 * smk_net4addr_insert
1071 * @new : netlabel to insert
1072 *
1073 * This helper insert netlabel in the smack_net4addrs list
1074 * sorted by netmask length (longest to smallest)
1075 * locked by &smk_net4addr_lock in smk_write_net4addr
1076 *
1077 */
1078static void smk_net4addr_insert(struct smk_net4addr *new)
1079{
1080 struct smk_net4addr *m;
1081 struct smk_net4addr *m_next;
1082
1083 if (list_empty(&smk_net4addr_list)) {
1084 list_add_rcu(&new->list, &smk_net4addr_list);
1085 return;
1086 }
1087
1088 m = list_entry_rcu(smk_net4addr_list.next,
1089 struct smk_net4addr, list);
1090
1091 /* the comparison '>' is a bit hacky, but works */
1092 if (new->smk_masks > m->smk_masks) {
1093 list_add_rcu(&new->list, &smk_net4addr_list);
1094 return;
1095 }
1096
1097 list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1098 if (list_is_last(&m->list, &smk_net4addr_list)) {
1099 list_add_rcu(&new->list, &m->list);
1100 return;
1101 }
1102 m_next = list_entry_rcu(m->list.next,
1103 struct smk_net4addr, list);
1104 if (new->smk_masks > m_next->smk_masks) {
1105 list_add_rcu(&new->list, &m->list);
1106 return;
1107 }
1108 }
1109}
1110
1111
1112/**
1113 * smk_write_net4addr - write() for /smack/netlabel
1114 * @file: file pointer, not actually used
1115 * @buf: where to get the data from
1116 * @count: bytes sent
1117 * @ppos: where to start
1118 *
1119 * Accepts only one net4addr per write call.
1120 * Returns number of bytes written or error code, as appropriate
1121 */
1122static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1123 size_t count, loff_t *ppos)
1124{
1125 struct smk_net4addr *snp;
1126 struct sockaddr_in newname;
1127 char *smack;
1128 struct smack_known *skp = NULL;
1129 char *data;
1130 char *host = (char *)&newname.sin_addr.s_addr;
1131 int rc;
1132 struct netlbl_audit audit_info;
1133 struct in_addr mask;
1134 unsigned int m;
1135 unsigned int masks;
1136 int found;
1137 u32 mask_bits = (1<<31);
1138 __be32 nsa;
1139 u32 temp_mask;
1140
1141 /*
1142 * Must have privilege.
1143 * No partial writes.
1144 * Enough data must be present.
1145 * "<addr/mask, as a.b.c.d/e><space><label>"
1146 * "<addr, as a.b.c.d><space><label>"
1147 */
1148 if (!smack_privileged(CAP_MAC_ADMIN))
1149 return -EPERM;
1150 if (*ppos != 0)
1151 return -EINVAL;
1152 if (count < SMK_NETLBLADDRMIN)
1153 return -EINVAL;
1154
1155 data = memdup_user_nul(buf, count);
1156 if (IS_ERR(data))
1157 return PTR_ERR(data);
1158
1159 smack = kzalloc(count + 1, GFP_KERNEL);
1160 if (smack == NULL) {
1161 rc = -ENOMEM;
1162 goto free_data_out;
1163 }
1164
1165 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1166 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1167 if (rc != 6) {
1168 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1169 &host[0], &host[1], &host[2], &host[3], smack);
1170 if (rc != 5) {
1171 rc = -EINVAL;
1172 goto free_out;
1173 }
1174 m = BEBITS;
1175 masks = 32;
1176 }
1177 if (masks > BEBITS) {
1178 rc = -EINVAL;
1179 goto free_out;
1180 }
1181
1182 /*
1183 * If smack begins with '-', it is an option, don't import it
1184 */
1185 if (smack[0] != '-') {
1186 skp = smk_import_entry(smack, 0);
1187 if (IS_ERR(skp)) {
1188 rc = PTR_ERR(skp);
1189 goto free_out;
1190 }
1191 } else {
1192 /*
1193 * Only the -CIPSO option is supported for IPv4
1194 */
1195 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1196 rc = -EINVAL;
1197 goto free_out;
1198 }
1199 }
1200
1201 for (m = masks, temp_mask = 0; m > 0; m--) {
1202 temp_mask |= mask_bits;
1203 mask_bits >>= 1;
1204 }
1205 mask.s_addr = cpu_to_be32(temp_mask);
1206
1207 newname.sin_addr.s_addr &= mask.s_addr;
1208 /*
1209 * Only allow one writer at a time. Writes should be
1210 * quite rare and small in any case.
1211 */
1212 mutex_lock(&smk_net4addr_lock);
1213
1214 nsa = newname.sin_addr.s_addr;
1215 /* try to find if the prefix is already in the list */
1216 found = 0;
1217 list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1218 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1219 found = 1;
1220 break;
1221 }
1222 }
1223 smk_netlabel_audit_set(&audit_info);
1224
1225 if (found == 0) {
1226 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1227 if (snp == NULL)
1228 rc = -ENOMEM;
1229 else {
1230 rc = 0;
1231 snp->smk_host.s_addr = newname.sin_addr.s_addr;
1232 snp->smk_mask.s_addr = mask.s_addr;
1233 snp->smk_label = skp;
1234 snp->smk_masks = masks;
1235 smk_net4addr_insert(snp);
1236 }
1237 } else {
1238 /*
1239 * Delete the unlabeled entry, only if the previous label
1240 * wasn't the special CIPSO option
1241 */
1242 if (snp->smk_label != NULL)
1243 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1244 &snp->smk_host, &snp->smk_mask,
1245 PF_INET, &audit_info);
1246 else
1247 rc = 0;
1248 snp->smk_label = skp;
1249 }
1250
1251 /*
1252 * Now tell netlabel about the single label nature of
1253 * this host so that incoming packets get labeled.
1254 * but only if we didn't get the special CIPSO option
1255 */
1256 if (rc == 0 && skp != NULL)
1257 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1258 &snp->smk_host, &snp->smk_mask, PF_INET,
1259 snp->smk_label->smk_secid, &audit_info);
1260
1261 if (rc == 0)
1262 rc = count;
1263
1264 mutex_unlock(&smk_net4addr_lock);
1265
1266free_out:
1267 kfree(smack);
1268free_data_out:
1269 kfree(data);
1270
1271 return rc;
1272}
1273
1274static const struct file_operations smk_net4addr_ops = {
1275 .open = smk_open_net4addr,
1276 .read = seq_read,
1277 .llseek = seq_lseek,
1278 .write = smk_write_net4addr,
1279 .release = seq_release,
1280};
1281
1282#if IS_ENABLED(CONFIG_IPV6)
1283/*
1284 * Seq_file read operations for /smack/netlabel6
1285 */
1286
1287static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1288{
1289 return smk_seq_start(s, pos, &smk_net6addr_list);
1290}
1291
1292static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1293{
1294 return smk_seq_next(s, v, pos, &smk_net6addr_list);
1295}
1296
1297/*
1298 * Print host/label pairs
1299 */
1300static int net6addr_seq_show(struct seq_file *s, void *v)
1301{
1302 struct list_head *list = v;
1303 struct smk_net6addr *skp =
1304 list_entry(list, struct smk_net6addr, list);
1305
1306 if (skp->smk_label != NULL)
1307 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1308 skp->smk_label->smk_known);
1309
1310 return 0;
1311}
1312
1313static const struct seq_operations net6addr_seq_ops = {
1314 .start = net6addr_seq_start,
1315 .next = net6addr_seq_next,
1316 .show = net6addr_seq_show,
1317 .stop = smk_seq_stop,
1318};
1319
1320/**
1321 * smk_open_net6addr - open() for /smack/netlabel
1322 * @inode: inode structure representing file
1323 * @file: "netlabel" file pointer
1324 *
1325 * Connect our net6addr_seq_* operations with /smack/netlabel
1326 * file_operations
1327 */
1328static int smk_open_net6addr(struct inode *inode, struct file *file)
1329{
1330 return seq_open(file, &net6addr_seq_ops);
1331}
1332
1333/**
1334 * smk_net6addr_insert
1335 * @new : entry to insert
1336 *
1337 * This inserts an entry in the smack_net6addrs list
1338 * sorted by netmask length (longest to smallest)
1339 * locked by &smk_net6addr_lock in smk_write_net6addr
1340 *
1341 */
1342static void smk_net6addr_insert(struct smk_net6addr *new)
1343{
1344 struct smk_net6addr *m_next;
1345 struct smk_net6addr *m;
1346
1347 if (list_empty(&smk_net6addr_list)) {
1348 list_add_rcu(&new->list, &smk_net6addr_list);
1349 return;
1350 }
1351
1352 m = list_entry_rcu(smk_net6addr_list.next,
1353 struct smk_net6addr, list);
1354
1355 if (new->smk_masks > m->smk_masks) {
1356 list_add_rcu(&new->list, &smk_net6addr_list);
1357 return;
1358 }
1359
1360 list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1361 if (list_is_last(&m->list, &smk_net6addr_list)) {
1362 list_add_rcu(&new->list, &m->list);
1363 return;
1364 }
1365 m_next = list_entry_rcu(m->list.next,
1366 struct smk_net6addr, list);
1367 if (new->smk_masks > m_next->smk_masks) {
1368 list_add_rcu(&new->list, &m->list);
1369 return;
1370 }
1371 }
1372}
1373
1374
1375/**
1376 * smk_write_net6addr - write() for /smack/netlabel
1377 * @file: file pointer, not actually used
1378 * @buf: where to get the data from
1379 * @count: bytes sent
1380 * @ppos: where to start
1381 *
1382 * Accepts only one net6addr per write call.
1383 * Returns number of bytes written or error code, as appropriate
1384 */
1385static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1386 size_t count, loff_t *ppos)
1387{
1388 struct smk_net6addr *snp;
1389 struct in6_addr newname;
1390 struct in6_addr fullmask;
1391 struct smack_known *skp = NULL;
1392 char *smack;
1393 char *data;
1394 int rc = 0;
1395 int found = 0;
1396 int i;
1397 unsigned int scanned[8];
1398 unsigned int m;
1399 unsigned int mask = 128;
1400
1401 /*
1402 * Must have privilege.
1403 * No partial writes.
1404 * Enough data must be present.
1405 * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1406 * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1407 */
1408 if (!smack_privileged(CAP_MAC_ADMIN))
1409 return -EPERM;
1410 if (*ppos != 0)
1411 return -EINVAL;
1412 if (count < SMK_NETLBLADDRMIN)
1413 return -EINVAL;
1414
1415 data = memdup_user_nul(buf, count);
1416 if (IS_ERR(data))
1417 return PTR_ERR(data);
1418
1419 smack = kzalloc(count + 1, GFP_KERNEL);
1420 if (smack == NULL) {
1421 rc = -ENOMEM;
1422 goto free_data_out;
1423 }
1424
1425 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1426 &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1427 &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1428 &mask, smack);
1429 if (i != 10) {
1430 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1431 &scanned[0], &scanned[1], &scanned[2],
1432 &scanned[3], &scanned[4], &scanned[5],
1433 &scanned[6], &scanned[7], smack);
1434 if (i != 9) {
1435 rc = -EINVAL;
1436 goto free_out;
1437 }
1438 }
1439 if (mask > 128) {
1440 rc = -EINVAL;
1441 goto free_out;
1442 }
1443 for (i = 0; i < 8; i++) {
1444 if (scanned[i] > 0xffff) {
1445 rc = -EINVAL;
1446 goto free_out;
1447 }
1448 newname.s6_addr16[i] = htons(scanned[i]);
1449 }
1450
1451 /*
1452 * If smack begins with '-', it is an option, don't import it
1453 */
1454 if (smack[0] != '-') {
1455 skp = smk_import_entry(smack, 0);
1456 if (IS_ERR(skp)) {
1457 rc = PTR_ERR(skp);
1458 goto free_out;
1459 }
1460 } else {
1461 /*
1462 * Only -DELETE is supported for IPv6
1463 */
1464 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1465 rc = -EINVAL;
1466 goto free_out;
1467 }
1468 }
1469
1470 for (i = 0, m = mask; i < 8; i++) {
1471 if (m >= 16) {
1472 fullmask.s6_addr16[i] = 0xffff;
1473 m -= 16;
1474 } else if (m > 0) {
1475 fullmask.s6_addr16[i] = (1 << m) - 1;
1476 m = 0;
1477 } else
1478 fullmask.s6_addr16[i] = 0;
1479 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1480 }
1481
1482 /*
1483 * Only allow one writer at a time. Writes should be
1484 * quite rare and small in any case.
1485 */
1486 mutex_lock(&smk_net6addr_lock);
1487 /*
1488 * Try to find the prefix in the list
1489 */
1490 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1491 if (mask != snp->smk_masks)
1492 continue;
1493 for (found = 1, i = 0; i < 8; i++) {
1494 if (newname.s6_addr16[i] !=
1495 snp->smk_host.s6_addr16[i]) {
1496 found = 0;
1497 break;
1498 }
1499 }
1500 if (found == 1)
1501 break;
1502 }
1503 if (found == 0) {
1504 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1505 if (snp == NULL)
1506 rc = -ENOMEM;
1507 else {
1508 snp->smk_host = newname;
1509 snp->smk_mask = fullmask;
1510 snp->smk_masks = mask;
1511 snp->smk_label = skp;
1512 smk_net6addr_insert(snp);
1513 }
1514 } else {
1515 snp->smk_label = skp;
1516 }
1517
1518 if (rc == 0)
1519 rc = count;
1520
1521 mutex_unlock(&smk_net6addr_lock);
1522
1523free_out:
1524 kfree(smack);
1525free_data_out:
1526 kfree(data);
1527
1528 return rc;
1529}
1530
1531static const struct file_operations smk_net6addr_ops = {
1532 .open = smk_open_net6addr,
1533 .read = seq_read,
1534 .llseek = seq_lseek,
1535 .write = smk_write_net6addr,
1536 .release = seq_release,
1537};
1538#endif /* CONFIG_IPV6 */
1539
1540/**
1541 * smk_read_doi - read() for /smack/doi
1542 * @filp: file pointer, not actually used
1543 * @buf: where to put the result
1544 * @count: maximum to send along
1545 * @ppos: where to start
1546 *
1547 * Returns number of bytes read or error code, as appropriate
1548 */
1549static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1550 size_t count, loff_t *ppos)
1551{
1552 char temp[80];
1553 ssize_t rc;
1554
1555 if (*ppos != 0)
1556 return 0;
1557
1558 sprintf(temp, "%d", smk_cipso_doi_value);
1559 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1560
1561 return rc;
1562}
1563
1564/**
1565 * smk_write_doi - write() for /smack/doi
1566 * @file: file pointer, not actually used
1567 * @buf: where to get the data from
1568 * @count: bytes sent
1569 * @ppos: where to start
1570 *
1571 * Returns number of bytes written or error code, as appropriate
1572 */
1573static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1574 size_t count, loff_t *ppos)
1575{
1576 char temp[80];
1577 int i;
1578
1579 if (!smack_privileged(CAP_MAC_ADMIN))
1580 return -EPERM;
1581
1582 if (count >= sizeof(temp) || count == 0)
1583 return -EINVAL;
1584
1585 if (copy_from_user(temp, buf, count) != 0)
1586 return -EFAULT;
1587
1588 temp[count] = '\0';
1589
1590 if (sscanf(temp, "%d", &i) != 1)
1591 return -EINVAL;
1592
1593 smk_cipso_doi_value = i;
1594
1595 smk_cipso_doi();
1596
1597 return count;
1598}
1599
1600static const struct file_operations smk_doi_ops = {
1601 .read = smk_read_doi,
1602 .write = smk_write_doi,
1603 .llseek = default_llseek,
1604};
1605
1606/**
1607 * smk_read_direct - read() for /smack/direct
1608 * @filp: file pointer, not actually used
1609 * @buf: where to put the result
1610 * @count: maximum to send along
1611 * @ppos: where to start
1612 *
1613 * Returns number of bytes read or error code, as appropriate
1614 */
1615static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1616 size_t count, loff_t *ppos)
1617{
1618 char temp[80];
1619 ssize_t rc;
1620
1621 if (*ppos != 0)
1622 return 0;
1623
1624 sprintf(temp, "%d", smack_cipso_direct);
1625 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1626
1627 return rc;
1628}
1629
1630/**
1631 * smk_write_direct - write() for /smack/direct
1632 * @file: file pointer, not actually used
1633 * @buf: where to get the data from
1634 * @count: bytes sent
1635 * @ppos: where to start
1636 *
1637 * Returns number of bytes written or error code, as appropriate
1638 */
1639static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1640 size_t count, loff_t *ppos)
1641{
1642 struct smack_known *skp;
1643 char temp[80];
1644 int i;
1645
1646 if (!smack_privileged(CAP_MAC_ADMIN))
1647 return -EPERM;
1648
1649 if (count >= sizeof(temp) || count == 0)
1650 return -EINVAL;
1651
1652 if (copy_from_user(temp, buf, count) != 0)
1653 return -EFAULT;
1654
1655 temp[count] = '\0';
1656
1657 if (sscanf(temp, "%d", &i) != 1)
1658 return -EINVAL;
1659
1660 /*
1661 * Don't do anything if the value hasn't actually changed.
1662 * If it is changing reset the level on entries that were
1663 * set up to be direct when they were created.
1664 */
1665 if (smack_cipso_direct != i) {
1666 mutex_lock(&smack_known_lock);
1667 list_for_each_entry_rcu(skp, &smack_known_list, list)
1668 if (skp->smk_netlabel.attr.mls.lvl ==
1669 smack_cipso_direct)
1670 skp->smk_netlabel.attr.mls.lvl = i;
1671 smack_cipso_direct = i;
1672 mutex_unlock(&smack_known_lock);
1673 }
1674
1675 return count;
1676}
1677
1678static const struct file_operations smk_direct_ops = {
1679 .read = smk_read_direct,
1680 .write = smk_write_direct,
1681 .llseek = default_llseek,
1682};
1683
1684/**
1685 * smk_read_mapped - read() for /smack/mapped
1686 * @filp: file pointer, not actually used
1687 * @buf: where to put the result
1688 * @count: maximum to send along
1689 * @ppos: where to start
1690 *
1691 * Returns number of bytes read or error code, as appropriate
1692 */
1693static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1694 size_t count, loff_t *ppos)
1695{
1696 char temp[80];
1697 ssize_t rc;
1698
1699 if (*ppos != 0)
1700 return 0;
1701
1702 sprintf(temp, "%d", smack_cipso_mapped);
1703 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1704
1705 return rc;
1706}
1707
1708/**
1709 * smk_write_mapped - write() for /smack/mapped
1710 * @file: file pointer, not actually used
1711 * @buf: where to get the data from
1712 * @count: bytes sent
1713 * @ppos: where to start
1714 *
1715 * Returns number of bytes written or error code, as appropriate
1716 */
1717static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1718 size_t count, loff_t *ppos)
1719{
1720 struct smack_known *skp;
1721 char temp[80];
1722 int i;
1723
1724 if (!smack_privileged(CAP_MAC_ADMIN))
1725 return -EPERM;
1726
1727 if (count >= sizeof(temp) || count == 0)
1728 return -EINVAL;
1729
1730 if (copy_from_user(temp, buf, count) != 0)
1731 return -EFAULT;
1732
1733 temp[count] = '\0';
1734
1735 if (sscanf(temp, "%d", &i) != 1)
1736 return -EINVAL;
1737
1738 /*
1739 * Don't do anything if the value hasn't actually changed.
1740 * If it is changing reset the level on entries that were
1741 * set up to be mapped when they were created.
1742 */
1743 if (smack_cipso_mapped != i) {
1744 mutex_lock(&smack_known_lock);
1745 list_for_each_entry_rcu(skp, &smack_known_list, list)
1746 if (skp->smk_netlabel.attr.mls.lvl ==
1747 smack_cipso_mapped)
1748 skp->smk_netlabel.attr.mls.lvl = i;
1749 smack_cipso_mapped = i;
1750 mutex_unlock(&smack_known_lock);
1751 }
1752
1753 return count;
1754}
1755
1756static const struct file_operations smk_mapped_ops = {
1757 .read = smk_read_mapped,
1758 .write = smk_write_mapped,
1759 .llseek = default_llseek,
1760};
1761
1762/**
1763 * smk_read_ambient - read() for /smack/ambient
1764 * @filp: file pointer, not actually used
1765 * @buf: where to put the result
1766 * @cn: maximum to send along
1767 * @ppos: where to start
1768 *
1769 * Returns number of bytes read or error code, as appropriate
1770 */
1771static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1772 size_t cn, loff_t *ppos)
1773{
1774 ssize_t rc;
1775 int asize;
1776
1777 if (*ppos != 0)
1778 return 0;
1779 /*
1780 * Being careful to avoid a problem in the case where
1781 * smack_net_ambient gets changed in midstream.
1782 */
1783 mutex_lock(&smack_ambient_lock);
1784
1785 asize = strlen(smack_net_ambient->smk_known) + 1;
1786
1787 if (cn >= asize)
1788 rc = simple_read_from_buffer(buf, cn, ppos,
1789 smack_net_ambient->smk_known,
1790 asize);
1791 else
1792 rc = -EINVAL;
1793
1794 mutex_unlock(&smack_ambient_lock);
1795
1796 return rc;
1797}
1798
1799/**
1800 * smk_write_ambient - write() for /smack/ambient
1801 * @file: file pointer, not actually used
1802 * @buf: where to get the data from
1803 * @count: bytes sent
1804 * @ppos: where to start
1805 *
1806 * Returns number of bytes written or error code, as appropriate
1807 */
1808static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1809 size_t count, loff_t *ppos)
1810{
1811 struct smack_known *skp;
1812 char *oldambient;
1813 char *data;
1814 int rc = count;
1815
1816 if (!smack_privileged(CAP_MAC_ADMIN))
1817 return -EPERM;
1818
1819 data = memdup_user_nul(buf, count);
1820 if (IS_ERR(data))
1821 return PTR_ERR(data);
1822
1823 skp = smk_import_entry(data, count);
1824 if (IS_ERR(skp)) {
1825 rc = PTR_ERR(skp);
1826 goto out;
1827 }
1828
1829 mutex_lock(&smack_ambient_lock);
1830
1831 oldambient = smack_net_ambient->smk_known;
1832 smack_net_ambient = skp;
1833 smk_unlbl_ambient(oldambient);
1834
1835 mutex_unlock(&smack_ambient_lock);
1836
1837out:
1838 kfree(data);
1839 return rc;
1840}
1841
1842static const struct file_operations smk_ambient_ops = {
1843 .read = smk_read_ambient,
1844 .write = smk_write_ambient,
1845 .llseek = default_llseek,
1846};
1847
1848/*
1849 * Seq_file operations for /smack/onlycap
1850 */
1851static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1852{
1853 return smk_seq_start(s, pos, &smack_onlycap_list);
1854}
1855
1856static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1857{
1858 return smk_seq_next(s, v, pos, &smack_onlycap_list);
1859}
1860
1861static int onlycap_seq_show(struct seq_file *s, void *v)
1862{
1863 struct list_head *list = v;
1864 struct smack_known_list_elem *sklep =
1865 list_entry_rcu(list, struct smack_known_list_elem, list);
1866
1867 seq_puts(s, sklep->smk_label->smk_known);
1868 seq_putc(s, ' ');
1869
1870 return 0;
1871}
1872
1873static const struct seq_operations onlycap_seq_ops = {
1874 .start = onlycap_seq_start,
1875 .next = onlycap_seq_next,
1876 .show = onlycap_seq_show,
1877 .stop = smk_seq_stop,
1878};
1879
1880static int smk_open_onlycap(struct inode *inode, struct file *file)
1881{
1882 return seq_open(file, &onlycap_seq_ops);
1883}
1884
1885/**
1886 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1887 * The caller must hold appropriate mutex to prevent concurrent modifications
1888 * to the public list.
1889 * Private list is assumed to be not accessible to other threads yet.
1890 *
1891 * @public: public list
1892 * @private: private list
1893 */
1894static void smk_list_swap_rcu(struct list_head *public,
1895 struct list_head *private)
1896{
1897 struct list_head *first, *last;
1898
1899 if (list_empty(public)) {
1900 list_splice_init_rcu(private, public, synchronize_rcu);
1901 } else {
1902 /* Remember public list before replacing it */
1903 first = public->next;
1904 last = public->prev;
1905
1906 /* Publish private list in place of public in RCU-safe way */
1907 private->prev->next = public;
1908 private->next->prev = public;
1909 rcu_assign_pointer(public->next, private->next);
1910 public->prev = private->prev;
1911
1912 synchronize_rcu();
1913
1914 /* When all readers are done with the old public list,
1915 * attach it in place of private */
1916 private->next = first;
1917 private->prev = last;
1918 first->prev = private;
1919 last->next = private;
1920 }
1921}
1922
1923/**
1924 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1925 *
1926 * @data: the string to parse
1927 * @private: destination list
1928 *
1929 * Returns zero on success or error code, as appropriate
1930 */
1931static int smk_parse_label_list(char *data, struct list_head *list)
1932{
1933 char *tok;
1934 struct smack_known *skp;
1935 struct smack_known_list_elem *sklep;
1936
1937 while ((tok = strsep(&data, " ")) != NULL) {
1938 if (!*tok)
1939 continue;
1940
1941 skp = smk_import_entry(tok, 0);
1942 if (IS_ERR(skp))
1943 return PTR_ERR(skp);
1944
1945 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1946 if (sklep == NULL)
1947 return -ENOMEM;
1948
1949 sklep->smk_label = skp;
1950 list_add(&sklep->list, list);
1951 }
1952
1953 return 0;
1954}
1955
1956/**
1957 * smk_destroy_label_list - destroy a list of smack_known_list_elem
1958 * @head: header pointer of the list to destroy
1959 */
1960void smk_destroy_label_list(struct list_head *list)
1961{
1962 struct smack_known_list_elem *sklep;
1963 struct smack_known_list_elem *sklep2;
1964
1965 list_for_each_entry_safe(sklep, sklep2, list, list)
1966 kfree(sklep);
1967
1968 INIT_LIST_HEAD(list);
1969}
1970
1971/**
1972 * smk_write_onlycap - write() for smackfs/onlycap
1973 * @file: file pointer, not actually used
1974 * @buf: where to get the data from
1975 * @count: bytes sent
1976 * @ppos: where to start
1977 *
1978 * Returns number of bytes written or error code, as appropriate
1979 */
1980static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1981 size_t count, loff_t *ppos)
1982{
1983 char *data;
1984 LIST_HEAD(list_tmp);
1985 int rc;
1986
1987 if (!smack_privileged(CAP_MAC_ADMIN))
1988 return -EPERM;
1989
1990 data = memdup_user_nul(buf, count);
1991 if (IS_ERR(data))
1992 return PTR_ERR(data);
1993
1994 rc = smk_parse_label_list(data, &list_tmp);
1995 kfree(data);
1996
1997 /*
1998 * Clear the smack_onlycap on invalid label errors. This means
1999 * that we can pass a null string to unset the onlycap value.
2000 *
2001 * Importing will also reject a label beginning with '-',
2002 * so "-usecapabilities" will also work.
2003 *
2004 * But do so only on invalid label, not on system errors.
2005 * The invalid label must be first to count as clearing attempt.
2006 */
2007 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2008 mutex_lock(&smack_onlycap_lock);
2009 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2010 mutex_unlock(&smack_onlycap_lock);
2011 rc = count;
2012 }
2013
2014 smk_destroy_label_list(&list_tmp);
2015
2016 return rc;
2017}
2018
2019static const struct file_operations smk_onlycap_ops = {
2020 .open = smk_open_onlycap,
2021 .read = seq_read,
2022 .write = smk_write_onlycap,
2023 .llseek = seq_lseek,
2024 .release = seq_release,
2025};
2026
2027#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2028/**
2029 * smk_read_unconfined - read() for smackfs/unconfined
2030 * @filp: file pointer, not actually used
2031 * @buf: where to put the result
2032 * @cn: maximum to send along
2033 * @ppos: where to start
2034 *
2035 * Returns number of bytes read or error code, as appropriate
2036 */
2037static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2038 size_t cn, loff_t *ppos)
2039{
2040 char *smack = "";
2041 ssize_t rc = -EINVAL;
2042 int asize;
2043
2044 if (*ppos != 0)
2045 return 0;
2046
2047 if (smack_unconfined != NULL)
2048 smack = smack_unconfined->smk_known;
2049
2050 asize = strlen(smack) + 1;
2051
2052 if (cn >= asize)
2053 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2054
2055 return rc;
2056}
2057
2058/**
2059 * smk_write_unconfined - write() for smackfs/unconfined
2060 * @file: file pointer, not actually used
2061 * @buf: where to get the data from
2062 * @count: bytes sent
2063 * @ppos: where to start
2064 *
2065 * Returns number of bytes written or error code, as appropriate
2066 */
2067static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2068 size_t count, loff_t *ppos)
2069{
2070 char *data;
2071 struct smack_known *skp;
2072 int rc = count;
2073
2074 if (!smack_privileged(CAP_MAC_ADMIN))
2075 return -EPERM;
2076
2077 data = memdup_user_nul(buf, count);
2078 if (IS_ERR(data))
2079 return PTR_ERR(data);
2080
2081 /*
2082 * Clear the smack_unconfined on invalid label errors. This means
2083 * that we can pass a null string to unset the unconfined value.
2084 *
2085 * Importing will also reject a label beginning with '-',
2086 * so "-confine" will also work.
2087 *
2088 * But do so only on invalid label, not on system errors.
2089 */
2090 skp = smk_import_entry(data, count);
2091 if (PTR_ERR(skp) == -EINVAL)
2092 skp = NULL;
2093 else if (IS_ERR(skp)) {
2094 rc = PTR_ERR(skp);
2095 goto freeout;
2096 }
2097
2098 smack_unconfined = skp;
2099
2100freeout:
2101 kfree(data);
2102 return rc;
2103}
2104
2105static const struct file_operations smk_unconfined_ops = {
2106 .read = smk_read_unconfined,
2107 .write = smk_write_unconfined,
2108 .llseek = default_llseek,
2109};
2110#endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2111
2112/**
2113 * smk_read_logging - read() for /smack/logging
2114 * @filp: file pointer, not actually used
2115 * @buf: where to put the result
2116 * @cn: maximum to send along
2117 * @ppos: where to start
2118 *
2119 * Returns number of bytes read or error code, as appropriate
2120 */
2121static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2122 size_t count, loff_t *ppos)
2123{
2124 char temp[32];
2125 ssize_t rc;
2126
2127 if (*ppos != 0)
2128 return 0;
2129
2130 sprintf(temp, "%d\n", log_policy);
2131 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2132 return rc;
2133}
2134
2135/**
2136 * smk_write_logging - write() for /smack/logging
2137 * @file: file pointer, not actually used
2138 * @buf: where to get the data from
2139 * @count: bytes sent
2140 * @ppos: where to start
2141 *
2142 * Returns number of bytes written or error code, as appropriate
2143 */
2144static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2145 size_t count, loff_t *ppos)
2146{
2147 char temp[32];
2148 int i;
2149
2150 if (!smack_privileged(CAP_MAC_ADMIN))
2151 return -EPERM;
2152
2153 if (count >= sizeof(temp) || count == 0)
2154 return -EINVAL;
2155
2156 if (copy_from_user(temp, buf, count) != 0)
2157 return -EFAULT;
2158
2159 temp[count] = '\0';
2160
2161 if (sscanf(temp, "%d", &i) != 1)
2162 return -EINVAL;
2163 if (i < 0 || i > 3)
2164 return -EINVAL;
2165 log_policy = i;
2166 return count;
2167}
2168
2169
2170
2171static const struct file_operations smk_logging_ops = {
2172 .read = smk_read_logging,
2173 .write = smk_write_logging,
2174 .llseek = default_llseek,
2175};
2176
2177/*
2178 * Seq_file read operations for /smack/load-self
2179 */
2180
2181static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2182{
2183 struct task_smack *tsp = smack_cred(current_cred());
2184
2185 return smk_seq_start(s, pos, &tsp->smk_rules);
2186}
2187
2188static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2189{
2190 struct task_smack *tsp = smack_cred(current_cred());
2191
2192 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2193}
2194
2195static int load_self_seq_show(struct seq_file *s, void *v)
2196{
2197 struct list_head *list = v;
2198 struct smack_rule *srp =
2199 list_entry_rcu(list, struct smack_rule, list);
2200
2201 smk_rule_show(s, srp, SMK_LABELLEN);
2202
2203 return 0;
2204}
2205
2206static const struct seq_operations load_self_seq_ops = {
2207 .start = load_self_seq_start,
2208 .next = load_self_seq_next,
2209 .show = load_self_seq_show,
2210 .stop = smk_seq_stop,
2211};
2212
2213
2214/**
2215 * smk_open_load_self - open() for /smack/load-self2
2216 * @inode: inode structure representing file
2217 * @file: "load" file pointer
2218 *
2219 * For reading, use load_seq_* seq_file reading operations.
2220 */
2221static int smk_open_load_self(struct inode *inode, struct file *file)
2222{
2223 return seq_open(file, &load_self_seq_ops);
2224}
2225
2226/**
2227 * smk_write_load_self - write() for /smack/load-self
2228 * @file: file pointer, not actually used
2229 * @buf: where to get the data from
2230 * @count: bytes sent
2231 * @ppos: where to start - must be 0
2232 *
2233 */
2234static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2235 size_t count, loff_t *ppos)
2236{
2237 struct task_smack *tsp = smack_cred(current_cred());
2238
2239 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2240 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2241}
2242
2243static const struct file_operations smk_load_self_ops = {
2244 .open = smk_open_load_self,
2245 .read = seq_read,
2246 .llseek = seq_lseek,
2247 .write = smk_write_load_self,
2248 .release = seq_release,
2249};
2250
2251/**
2252 * smk_user_access - handle access check transaction
2253 * @file: file pointer
2254 * @buf: data from user space
2255 * @count: bytes sent
2256 * @ppos: where to start - must be 0
2257 */
2258static ssize_t smk_user_access(struct file *file, const char __user *buf,
2259 size_t count, loff_t *ppos, int format)
2260{
2261 struct smack_parsed_rule rule;
2262 char *data;
2263 int res;
2264
2265 data = simple_transaction_get(file, buf, count);
2266 if (IS_ERR(data))
2267 return PTR_ERR(data);
2268
2269 if (format == SMK_FIXED24_FMT) {
2270 if (count < SMK_LOADLEN)
2271 return -EINVAL;
2272 res = smk_parse_rule(data, &rule, 0);
2273 } else {
2274 /*
2275 * simple_transaction_get() returns null-terminated data
2276 */
2277 res = smk_parse_long_rule(data, &rule, 0, 3);
2278 }
2279
2280 if (res >= 0)
2281 res = smk_access(rule.smk_subject, rule.smk_object,
2282 rule.smk_access1, NULL);
2283 else if (res != -ENOENT)
2284 return res;
2285
2286 /*
2287 * smk_access() can return a value > 0 in the "bringup" case.
2288 */
2289 data[0] = res >= 0 ? '1' : '0';
2290 data[1] = '\0';
2291
2292 simple_transaction_set(file, 2);
2293
2294 if (format == SMK_FIXED24_FMT)
2295 return SMK_LOADLEN;
2296 return count;
2297}
2298
2299/**
2300 * smk_write_access - handle access check transaction
2301 * @file: file pointer
2302 * @buf: data from user space
2303 * @count: bytes sent
2304 * @ppos: where to start - must be 0
2305 */
2306static ssize_t smk_write_access(struct file *file, const char __user *buf,
2307 size_t count, loff_t *ppos)
2308{
2309 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2310}
2311
2312static const struct file_operations smk_access_ops = {
2313 .write = smk_write_access,
2314 .read = simple_transaction_read,
2315 .release = simple_transaction_release,
2316 .llseek = generic_file_llseek,
2317};
2318
2319
2320/*
2321 * Seq_file read operations for /smack/load2
2322 */
2323
2324static int load2_seq_show(struct seq_file *s, void *v)
2325{
2326 struct list_head *list = v;
2327 struct smack_rule *srp;
2328 struct smack_known *skp =
2329 list_entry_rcu(list, struct smack_known, list);
2330
2331 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
2332 smk_rule_show(s, srp, SMK_LONGLABEL);
2333
2334 return 0;
2335}
2336
2337static const struct seq_operations load2_seq_ops = {
2338 .start = load2_seq_start,
2339 .next = load2_seq_next,
2340 .show = load2_seq_show,
2341 .stop = smk_seq_stop,
2342};
2343
2344/**
2345 * smk_open_load2 - open() for /smack/load2
2346 * @inode: inode structure representing file
2347 * @file: "load2" file pointer
2348 *
2349 * For reading, use load2_seq_* seq_file reading operations.
2350 */
2351static int smk_open_load2(struct inode *inode, struct file *file)
2352{
2353 return seq_open(file, &load2_seq_ops);
2354}
2355
2356/**
2357 * smk_write_load2 - write() for /smack/load2
2358 * @file: file pointer, not actually used
2359 * @buf: where to get the data from
2360 * @count: bytes sent
2361 * @ppos: where to start - must be 0
2362 *
2363 */
2364static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2365 size_t count, loff_t *ppos)
2366{
2367 /*
2368 * Must have privilege.
2369 */
2370 if (!smack_privileged(CAP_MAC_ADMIN))
2371 return -EPERM;
2372
2373 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2374 SMK_LONG_FMT);
2375}
2376
2377static const struct file_operations smk_load2_ops = {
2378 .open = smk_open_load2,
2379 .read = seq_read,
2380 .llseek = seq_lseek,
2381 .write = smk_write_load2,
2382 .release = seq_release,
2383};
2384
2385/*
2386 * Seq_file read operations for /smack/load-self2
2387 */
2388
2389static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2390{
2391 struct task_smack *tsp = smack_cred(current_cred());
2392
2393 return smk_seq_start(s, pos, &tsp->smk_rules);
2394}
2395
2396static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2397{
2398 struct task_smack *tsp = smack_cred(current_cred());
2399
2400 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2401}
2402
2403static int load_self2_seq_show(struct seq_file *s, void *v)
2404{
2405 struct list_head *list = v;
2406 struct smack_rule *srp =
2407 list_entry_rcu(list, struct smack_rule, list);
2408
2409 smk_rule_show(s, srp, SMK_LONGLABEL);
2410
2411 return 0;
2412}
2413
2414static const struct seq_operations load_self2_seq_ops = {
2415 .start = load_self2_seq_start,
2416 .next = load_self2_seq_next,
2417 .show = load_self2_seq_show,
2418 .stop = smk_seq_stop,
2419};
2420
2421/**
2422 * smk_open_load_self2 - open() for /smack/load-self2
2423 * @inode: inode structure representing file
2424 * @file: "load" file pointer
2425 *
2426 * For reading, use load_seq_* seq_file reading operations.
2427 */
2428static int smk_open_load_self2(struct inode *inode, struct file *file)
2429{
2430 return seq_open(file, &load_self2_seq_ops);
2431}
2432
2433/**
2434 * smk_write_load_self2 - write() for /smack/load-self2
2435 * @file: file pointer, not actually used
2436 * @buf: where to get the data from
2437 * @count: bytes sent
2438 * @ppos: where to start - must be 0
2439 *
2440 */
2441static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2442 size_t count, loff_t *ppos)
2443{
2444 struct task_smack *tsp = smack_cred(current_cred());
2445
2446 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2447 &tsp->smk_rules_lock, SMK_LONG_FMT);
2448}
2449
2450static const struct file_operations smk_load_self2_ops = {
2451 .open = smk_open_load_self2,
2452 .read = seq_read,
2453 .llseek = seq_lseek,
2454 .write = smk_write_load_self2,
2455 .release = seq_release,
2456};
2457
2458/**
2459 * smk_write_access2 - handle access check transaction
2460 * @file: file pointer
2461 * @buf: data from user space
2462 * @count: bytes sent
2463 * @ppos: where to start - must be 0
2464 */
2465static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2466 size_t count, loff_t *ppos)
2467{
2468 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2469}
2470
2471static const struct file_operations smk_access2_ops = {
2472 .write = smk_write_access2,
2473 .read = simple_transaction_read,
2474 .release = simple_transaction_release,
2475 .llseek = generic_file_llseek,
2476};
2477
2478/**
2479 * smk_write_revoke_subj - write() for /smack/revoke-subject
2480 * @file: file pointer
2481 * @buf: data from user space
2482 * @count: bytes sent
2483 * @ppos: where to start - must be 0
2484 */
2485static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2486 size_t count, loff_t *ppos)
2487{
2488 char *data;
2489 const char *cp;
2490 struct smack_known *skp;
2491 struct smack_rule *sp;
2492 struct list_head *rule_list;
2493 struct mutex *rule_lock;
2494 int rc = count;
2495
2496 if (*ppos != 0)
2497 return -EINVAL;
2498
2499 if (!smack_privileged(CAP_MAC_ADMIN))
2500 return -EPERM;
2501
2502 if (count == 0 || count > SMK_LONGLABEL)
2503 return -EINVAL;
2504
2505 data = memdup_user(buf, count);
2506 if (IS_ERR(data))
2507 return PTR_ERR(data);
2508
2509 cp = smk_parse_smack(data, count);
2510 if (IS_ERR(cp)) {
2511 rc = PTR_ERR(cp);
2512 goto out_data;
2513 }
2514
2515 skp = smk_find_entry(cp);
2516 if (skp == NULL)
2517 goto out_cp;
2518
2519 rule_list = &skp->smk_rules;
2520 rule_lock = &skp->smk_rules_lock;
2521
2522 mutex_lock(rule_lock);
2523
2524 list_for_each_entry_rcu(sp, rule_list, list)
2525 sp->smk_access = 0;
2526
2527 mutex_unlock(rule_lock);
2528
2529out_cp:
2530 kfree(cp);
2531out_data:
2532 kfree(data);
2533
2534 return rc;
2535}
2536
2537static const struct file_operations smk_revoke_subj_ops = {
2538 .write = smk_write_revoke_subj,
2539 .read = simple_transaction_read,
2540 .release = simple_transaction_release,
2541 .llseek = generic_file_llseek,
2542};
2543
2544/**
2545 * smk_init_sysfs - initialize /sys/fs/smackfs
2546 *
2547 */
2548static int smk_init_sysfs(void)
2549{
2550 return sysfs_create_mount_point(fs_kobj, "smackfs");
2551}
2552
2553/**
2554 * smk_write_change_rule - write() for /smack/change-rule
2555 * @file: file pointer
2556 * @buf: data from user space
2557 * @count: bytes sent
2558 * @ppos: where to start - must be 0
2559 */
2560static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2561 size_t count, loff_t *ppos)
2562{
2563 /*
2564 * Must have privilege.
2565 */
2566 if (!smack_privileged(CAP_MAC_ADMIN))
2567 return -EPERM;
2568
2569 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2570 SMK_CHANGE_FMT);
2571}
2572
2573static const struct file_operations smk_change_rule_ops = {
2574 .write = smk_write_change_rule,
2575 .read = simple_transaction_read,
2576 .release = simple_transaction_release,
2577 .llseek = generic_file_llseek,
2578};
2579
2580/**
2581 * smk_read_syslog - read() for smackfs/syslog
2582 * @filp: file pointer, not actually used
2583 * @buf: where to put the result
2584 * @cn: maximum to send along
2585 * @ppos: where to start
2586 *
2587 * Returns number of bytes read or error code, as appropriate
2588 */
2589static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2590 size_t cn, loff_t *ppos)
2591{
2592 struct smack_known *skp;
2593 ssize_t rc = -EINVAL;
2594 int asize;
2595
2596 if (*ppos != 0)
2597 return 0;
2598
2599 if (smack_syslog_label == NULL)
2600 skp = &smack_known_star;
2601 else
2602 skp = smack_syslog_label;
2603
2604 asize = strlen(skp->smk_known) + 1;
2605
2606 if (cn >= asize)
2607 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2608 asize);
2609
2610 return rc;
2611}
2612
2613/**
2614 * smk_write_syslog - write() for smackfs/syslog
2615 * @file: file pointer, not actually used
2616 * @buf: where to get the data from
2617 * @count: bytes sent
2618 * @ppos: where to start
2619 *
2620 * Returns number of bytes written or error code, as appropriate
2621 */
2622static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2623 size_t count, loff_t *ppos)
2624{
2625 char *data;
2626 struct smack_known *skp;
2627 int rc = count;
2628
2629 if (!smack_privileged(CAP_MAC_ADMIN))
2630 return -EPERM;
2631
2632 data = memdup_user_nul(buf, count);
2633 if (IS_ERR(data))
2634 return PTR_ERR(data);
2635
2636 skp = smk_import_entry(data, count);
2637 if (IS_ERR(skp))
2638 rc = PTR_ERR(skp);
2639 else
2640 smack_syslog_label = skp;
2641
2642 kfree(data);
2643 return rc;
2644}
2645
2646static const struct file_operations smk_syslog_ops = {
2647 .read = smk_read_syslog,
2648 .write = smk_write_syslog,
2649 .llseek = default_llseek,
2650};
2651
2652/*
2653 * Seq_file read operations for /smack/relabel-self
2654 */
2655
2656static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2657{
2658 struct task_smack *tsp = smack_cred(current_cred());
2659
2660 return smk_seq_start(s, pos, &tsp->smk_relabel);
2661}
2662
2663static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2664{
2665 struct task_smack *tsp = smack_cred(current_cred());
2666
2667 return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2668}
2669
2670static int relabel_self_seq_show(struct seq_file *s, void *v)
2671{
2672 struct list_head *list = v;
2673 struct smack_known_list_elem *sklep =
2674 list_entry(list, struct smack_known_list_elem, list);
2675
2676 seq_puts(s, sklep->smk_label->smk_known);
2677 seq_putc(s, ' ');
2678
2679 return 0;
2680}
2681
2682static const struct seq_operations relabel_self_seq_ops = {
2683 .start = relabel_self_seq_start,
2684 .next = relabel_self_seq_next,
2685 .show = relabel_self_seq_show,
2686 .stop = smk_seq_stop,
2687};
2688
2689/**
2690 * smk_open_relabel_self - open() for /smack/relabel-self
2691 * @inode: inode structure representing file
2692 * @file: "relabel-self" file pointer
2693 *
2694 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2695 * file_operations
2696 */
2697static int smk_open_relabel_self(struct inode *inode, struct file *file)
2698{
2699 return seq_open(file, &relabel_self_seq_ops);
2700}
2701
2702/**
2703 * smk_write_relabel_self - write() for /smack/relabel-self
2704 * @file: file pointer, not actually used
2705 * @buf: where to get the data from
2706 * @count: bytes sent
2707 * @ppos: where to start - must be 0
2708 *
2709 */
2710static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2711 size_t count, loff_t *ppos)
2712{
2713 struct task_smack *tsp = smack_cred(current_cred());
2714 char *data;
2715 int rc;
2716 LIST_HEAD(list_tmp);
2717
2718 /*
2719 * Must have privilege.
2720 */
2721 if (!smack_privileged(CAP_MAC_ADMIN))
2722 return -EPERM;
2723
2724 /*
2725 * Enough data must be present.
2726 */
2727 if (*ppos != 0)
2728 return -EINVAL;
2729
2730 data = memdup_user_nul(buf, count);
2731 if (IS_ERR(data))
2732 return PTR_ERR(data);
2733
2734 rc = smk_parse_label_list(data, &list_tmp);
2735 kfree(data);
2736
2737 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2738 smk_destroy_label_list(&tsp->smk_relabel);
2739 list_splice(&list_tmp, &tsp->smk_relabel);
2740 return count;
2741 }
2742
2743 smk_destroy_label_list(&list_tmp);
2744 return rc;
2745}
2746
2747static const struct file_operations smk_relabel_self_ops = {
2748 .open = smk_open_relabel_self,
2749 .read = seq_read,
2750 .llseek = seq_lseek,
2751 .write = smk_write_relabel_self,
2752 .release = seq_release,
2753};
2754
2755/**
2756 * smk_read_ptrace - read() for /smack/ptrace
2757 * @filp: file pointer, not actually used
2758 * @buf: where to put the result
2759 * @count: maximum to send along
2760 * @ppos: where to start
2761 *
2762 * Returns number of bytes read or error code, as appropriate
2763 */
2764static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2765 size_t count, loff_t *ppos)
2766{
2767 char temp[32];
2768 ssize_t rc;
2769
2770 if (*ppos != 0)
2771 return 0;
2772
2773 sprintf(temp, "%d\n", smack_ptrace_rule);
2774 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2775 return rc;
2776}
2777
2778/**
2779 * smk_write_ptrace - write() for /smack/ptrace
2780 * @file: file pointer
2781 * @buf: data from user space
2782 * @count: bytes sent
2783 * @ppos: where to start - must be 0
2784 */
2785static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2786 size_t count, loff_t *ppos)
2787{
2788 char temp[32];
2789 int i;
2790
2791 if (!smack_privileged(CAP_MAC_ADMIN))
2792 return -EPERM;
2793
2794 if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2795 return -EINVAL;
2796
2797 if (copy_from_user(temp, buf, count) != 0)
2798 return -EFAULT;
2799
2800 temp[count] = '\0';
2801
2802 if (sscanf(temp, "%d", &i) != 1)
2803 return -EINVAL;
2804 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2805 return -EINVAL;
2806 smack_ptrace_rule = i;
2807
2808 return count;
2809}
2810
2811static const struct file_operations smk_ptrace_ops = {
2812 .write = smk_write_ptrace,
2813 .read = smk_read_ptrace,
2814 .llseek = default_llseek,
2815};
2816
2817/**
2818 * smk_fill_super - fill the smackfs superblock
2819 * @sb: the empty superblock
2820 * @fc: unused
2821 *
2822 * Fill in the well known entries for the smack filesystem
2823 *
2824 * Returns 0 on success, an error code on failure
2825 */
2826static int smk_fill_super(struct super_block *sb, struct fs_context *fc)
2827{
2828 int rc;
2829
2830 static const struct tree_descr smack_files[] = {
2831 [SMK_LOAD] = {
2832 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2833 [SMK_CIPSO] = {
2834 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2835 [SMK_DOI] = {
2836 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2837 [SMK_DIRECT] = {
2838 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2839 [SMK_AMBIENT] = {
2840 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2841 [SMK_NET4ADDR] = {
2842 "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2843 [SMK_ONLYCAP] = {
2844 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2845 [SMK_LOGGING] = {
2846 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2847 [SMK_LOAD_SELF] = {
2848 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2849 [SMK_ACCESSES] = {
2850 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2851 [SMK_MAPPED] = {
2852 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2853 [SMK_LOAD2] = {
2854 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2855 [SMK_LOAD_SELF2] = {
2856 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2857 [SMK_ACCESS2] = {
2858 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2859 [SMK_CIPSO2] = {
2860 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2861 [SMK_REVOKE_SUBJ] = {
2862 "revoke-subject", &smk_revoke_subj_ops,
2863 S_IRUGO|S_IWUSR},
2864 [SMK_CHANGE_RULE] = {
2865 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2866 [SMK_SYSLOG] = {
2867 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2868 [SMK_PTRACE] = {
2869 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2870#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2871 [SMK_UNCONFINED] = {
2872 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2873#endif
2874#if IS_ENABLED(CONFIG_IPV6)
2875 [SMK_NET6ADDR] = {
2876 "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2877#endif /* CONFIG_IPV6 */
2878 [SMK_RELABEL_SELF] = {
2879 "relabel-self", &smk_relabel_self_ops,
2880 S_IRUGO|S_IWUGO},
2881 /* last one */
2882 {""}
2883 };
2884
2885 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2886 if (rc != 0) {
2887 printk(KERN_ERR "%s failed %d while creating inodes\n",
2888 __func__, rc);
2889 return rc;
2890 }
2891
2892 return 0;
2893}
2894
2895/**
2896 * smk_get_tree - get the smackfs superblock
2897 * @fc: The mount context, including any options
2898 *
2899 * Just passes everything along.
2900 *
2901 * Returns what the lower level code does.
2902 */
2903static int smk_get_tree(struct fs_context *fc)
2904{
2905 return get_tree_single(fc, smk_fill_super);
2906}
2907
2908static const struct fs_context_operations smk_context_ops = {
2909 .get_tree = smk_get_tree,
2910};
2911
2912/**
2913 * smk_init_fs_context - Initialise a filesystem context for smackfs
2914 * @fc: The blank mount context
2915 */
2916static int smk_init_fs_context(struct fs_context *fc)
2917{
2918 fc->ops = &smk_context_ops;
2919 return 0;
2920}
2921
2922static struct file_system_type smk_fs_type = {
2923 .name = "smackfs",
2924 .init_fs_context = smk_init_fs_context,
2925 .kill_sb = kill_litter_super,
2926};
2927
2928static struct vfsmount *smackfs_mount;
2929
2930static int __init smk_preset_netlabel(struct smack_known *skp)
2931{
2932 skp->smk_netlabel.domain = skp->smk_known;
2933 skp->smk_netlabel.flags =
2934 NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2935 return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2936 &skp->smk_netlabel, strlen(skp->smk_known));
2937}
2938
2939/**
2940 * init_smk_fs - get the smackfs superblock
2941 *
2942 * register the smackfs
2943 *
2944 * Do not register smackfs if Smack wasn't enabled
2945 * on boot. We can not put this method normally under the
2946 * smack_init() code path since the security subsystem get
2947 * initialized before the vfs caches.
2948 *
2949 * Returns true if we were not chosen on boot or if
2950 * we were chosen and filesystem registration succeeded.
2951 */
2952static int __init init_smk_fs(void)
2953{
2954 int err;
2955 int rc;
2956
2957 if (smack_enabled == 0)
2958 return 0;
2959
2960 err = smk_init_sysfs();
2961 if (err)
2962 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
2963
2964 err = register_filesystem(&smk_fs_type);
2965 if (!err) {
2966 smackfs_mount = kern_mount(&smk_fs_type);
2967 if (IS_ERR(smackfs_mount)) {
2968 printk(KERN_ERR "smackfs: could not mount!\n");
2969 err = PTR_ERR(smackfs_mount);
2970 smackfs_mount = NULL;
2971 }
2972 }
2973
2974 smk_cipso_doi();
2975 smk_unlbl_ambient(NULL);
2976
2977 rc = smk_preset_netlabel(&smack_known_floor);
2978 if (err == 0 && rc < 0)
2979 err = rc;
2980 rc = smk_preset_netlabel(&smack_known_hat);
2981 if (err == 0 && rc < 0)
2982 err = rc;
2983 rc = smk_preset_netlabel(&smack_known_huh);
2984 if (err == 0 && rc < 0)
2985 err = rc;
2986 rc = smk_preset_netlabel(&smack_known_star);
2987 if (err == 0 && rc < 0)
2988 err = rc;
2989 rc = smk_preset_netlabel(&smack_known_web);
2990 if (err == 0 && rc < 0)
2991 err = rc;
2992
2993 return err;
2994}
2995
2996__initcall(init_smk_fs);
1/*
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/netlabel.h>
26#include <net/cipso_ipv4.h>
27#include <linux/seq_file.h>
28#include <linux/ctype.h>
29#include <linux/audit.h>
30#include "smack.h"
31
32/*
33 * smackfs pseudo filesystem.
34 */
35
36enum smk_inos {
37 SMK_ROOT_INO = 2,
38 SMK_LOAD = 3, /* load policy */
39 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
40 SMK_DOI = 5, /* CIPSO DOI */
41 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
42 SMK_AMBIENT = 7, /* internet ambient label */
43 SMK_NETLBLADDR = 8, /* single label hosts */
44 SMK_ONLYCAP = 9, /* the only "capable" label */
45 SMK_LOGGING = 10, /* logging */
46 SMK_LOAD_SELF = 11, /* task specific rules */
47};
48
49/*
50 * List locks
51 */
52static DEFINE_MUTEX(smack_list_lock);
53static DEFINE_MUTEX(smack_cipso_lock);
54static DEFINE_MUTEX(smack_ambient_lock);
55static DEFINE_MUTEX(smk_netlbladdr_lock);
56
57/*
58 * This is the "ambient" label for network traffic.
59 * If it isn't somehow marked, use this.
60 * It can be reset via smackfs/ambient
61 */
62char *smack_net_ambient = smack_known_floor.smk_known;
63
64/*
65 * This is the level in a CIPSO header that indicates a
66 * smack label is contained directly in the category set.
67 * It can be reset via smackfs/direct
68 */
69int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
70
71/*
72 * Unless a process is running with this label even
73 * having CAP_MAC_OVERRIDE isn't enough to grant
74 * privilege to violate MAC policy. If no label is
75 * designated (the NULL case) capabilities apply to
76 * everyone. It is expected that the hat (^) label
77 * will be used if any label is used.
78 */
79char *smack_onlycap;
80
81/*
82 * Certain IP addresses may be designated as single label hosts.
83 * Packets are sent there unlabeled, but only from tasks that
84 * can write to the specified label.
85 */
86
87LIST_HEAD(smk_netlbladdr_list);
88LIST_HEAD(smack_rule_list);
89
90static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
91
92const char *smack_cipso_option = SMACK_CIPSO_OPTION;
93
94
95#define SEQ_READ_FINISHED 1
96
97/*
98 * Values for parsing cipso rules
99 * SMK_DIGITLEN: Length of a digit field in a rule.
100 * SMK_CIPSOMIN: Minimum possible cipso rule length.
101 * SMK_CIPSOMAX: Maximum possible cipso rule length.
102 */
103#define SMK_DIGITLEN 4
104#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
105#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
106
107/*
108 * Values for parsing MAC rules
109 * SMK_ACCESS: Maximum possible combination of access permissions
110 * SMK_ACCESSLEN: Maximum length for a rule access field
111 * SMK_LOADLEN: Smack rule length
112 */
113#define SMK_OACCESS "rwxa"
114#define SMK_ACCESS "rwxat"
115#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
116#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
117#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
118#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
119
120/**
121 * smk_netlabel_audit_set - fill a netlbl_audit struct
122 * @nap: structure to fill
123 */
124static void smk_netlabel_audit_set(struct netlbl_audit *nap)
125{
126 nap->loginuid = audit_get_loginuid(current);
127 nap->sessionid = audit_get_sessionid(current);
128 nap->secid = smack_to_secid(smk_of_current());
129}
130
131/*
132 * Values for parsing single label host rules
133 * "1.2.3.4 X"
134 * "192.168.138.129/32 abcdefghijklmnopqrstuvw"
135 */
136#define SMK_NETLBLADDRMIN 9
137#define SMK_NETLBLADDRMAX 42
138
139/**
140 * smk_set_access - add a rule to the rule list
141 * @srp: the new rule to add
142 * @rule_list: the list of rules
143 * @rule_lock: the rule list lock
144 *
145 * Looks through the current subject/object/access list for
146 * the subject/object pair and replaces the access that was
147 * there. If the pair isn't found add it with the specified
148 * access.
149 *
150 * Returns 1 if a rule was found to exist already, 0 if it is new
151 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
152 * during the allocation of the new pair to add.
153 */
154static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list,
155 struct mutex *rule_lock)
156{
157 struct smack_rule *sp;
158 int found = 0;
159
160 mutex_lock(rule_lock);
161
162 list_for_each_entry_rcu(sp, rule_list, list) {
163 if (sp->smk_subject == srp->smk_subject &&
164 sp->smk_object == srp->smk_object) {
165 found = 1;
166 sp->smk_access = srp->smk_access;
167 break;
168 }
169 }
170 if (found == 0)
171 list_add_rcu(&srp->list, rule_list);
172
173 mutex_unlock(rule_lock);
174
175 return found;
176}
177
178/**
179 * smk_write_load_list - write() for any /smack/load
180 * @file: file pointer, not actually used
181 * @buf: where to get the data from
182 * @count: bytes sent
183 * @ppos: where to start - must be 0
184 * @rule_list: the list of rules to write to
185 * @rule_lock: lock for the rule list
186 *
187 * Get one smack access rule from above.
188 * The format is exactly:
189 * char subject[SMK_LABELLEN]
190 * char object[SMK_LABELLEN]
191 * char access[SMK_ACCESSLEN]
192 *
193 * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes.
194 */
195static ssize_t smk_write_load_list(struct file *file, const char __user *buf,
196 size_t count, loff_t *ppos,
197 struct list_head *rule_list,
198 struct mutex *rule_lock)
199{
200 struct smack_rule *rule;
201 char *data;
202 int rc = -EINVAL;
203
204 /*
205 * No partial writes.
206 * Enough data must be present.
207 */
208 if (*ppos != 0)
209 return -EINVAL;
210 /*
211 * Minor hack for backward compatibility
212 */
213 if (count < (SMK_OLOADLEN) || count > SMK_LOADLEN)
214 return -EINVAL;
215
216 data = kzalloc(SMK_LOADLEN, GFP_KERNEL);
217 if (data == NULL)
218 return -ENOMEM;
219
220 if (copy_from_user(data, buf, count) != 0) {
221 rc = -EFAULT;
222 goto out;
223 }
224
225 /*
226 * More on the minor hack for backward compatibility
227 */
228 if (count == (SMK_OLOADLEN))
229 data[SMK_OLOADLEN] = '-';
230
231 rule = kzalloc(sizeof(*rule), GFP_KERNEL);
232 if (rule == NULL) {
233 rc = -ENOMEM;
234 goto out;
235 }
236
237 rule->smk_subject = smk_import(data, 0);
238 if (rule->smk_subject == NULL)
239 goto out_free_rule;
240
241 rule->smk_object = smk_import(data + SMK_LABELLEN, 0);
242 if (rule->smk_object == NULL)
243 goto out_free_rule;
244
245 rule->smk_access = 0;
246
247 switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
248 case '-':
249 break;
250 case 'r':
251 case 'R':
252 rule->smk_access |= MAY_READ;
253 break;
254 default:
255 goto out_free_rule;
256 }
257
258 switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
259 case '-':
260 break;
261 case 'w':
262 case 'W':
263 rule->smk_access |= MAY_WRITE;
264 break;
265 default:
266 goto out_free_rule;
267 }
268
269 switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
270 case '-':
271 break;
272 case 'x':
273 case 'X':
274 rule->smk_access |= MAY_EXEC;
275 break;
276 default:
277 goto out_free_rule;
278 }
279
280 switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
281 case '-':
282 break;
283 case 'a':
284 case 'A':
285 rule->smk_access |= MAY_APPEND;
286 break;
287 default:
288 goto out_free_rule;
289 }
290
291 switch (data[SMK_LABELLEN + SMK_LABELLEN + 4]) {
292 case '-':
293 break;
294 case 't':
295 case 'T':
296 rule->smk_access |= MAY_TRANSMUTE;
297 break;
298 default:
299 goto out_free_rule;
300 }
301
302 rc = count;
303 /*
304 * smk_set_access returns true if there was already a rule
305 * for the subject/object pair, and false if it was new.
306 */
307 if (!smk_set_access(rule, rule_list, rule_lock))
308 goto out;
309
310out_free_rule:
311 kfree(rule);
312out:
313 kfree(data);
314 return rc;
315}
316
317
318/*
319 * Seq_file read operations for /smack/load
320 */
321
322static void *load_seq_start(struct seq_file *s, loff_t *pos)
323{
324 if (*pos == SEQ_READ_FINISHED)
325 return NULL;
326 if (list_empty(&smack_rule_list))
327 return NULL;
328 return smack_rule_list.next;
329}
330
331static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
332{
333 struct list_head *list = v;
334
335 if (list_is_last(list, &smack_rule_list)) {
336 *pos = SEQ_READ_FINISHED;
337 return NULL;
338 }
339 return list->next;
340}
341
342static int load_seq_show(struct seq_file *s, void *v)
343{
344 struct list_head *list = v;
345 struct smack_rule *srp =
346 list_entry(list, struct smack_rule, list);
347
348 seq_printf(s, "%s %s", (char *)srp->smk_subject,
349 (char *)srp->smk_object);
350
351 seq_putc(s, ' ');
352
353 if (srp->smk_access & MAY_READ)
354 seq_putc(s, 'r');
355 if (srp->smk_access & MAY_WRITE)
356 seq_putc(s, 'w');
357 if (srp->smk_access & MAY_EXEC)
358 seq_putc(s, 'x');
359 if (srp->smk_access & MAY_APPEND)
360 seq_putc(s, 'a');
361 if (srp->smk_access & MAY_TRANSMUTE)
362 seq_putc(s, 't');
363 if (srp->smk_access == 0)
364 seq_putc(s, '-');
365
366 seq_putc(s, '\n');
367
368 return 0;
369}
370
371static void load_seq_stop(struct seq_file *s, void *v)
372{
373 /* No-op */
374}
375
376static const struct seq_operations load_seq_ops = {
377 .start = load_seq_start,
378 .next = load_seq_next,
379 .show = load_seq_show,
380 .stop = load_seq_stop,
381};
382
383/**
384 * smk_open_load - open() for /smack/load
385 * @inode: inode structure representing file
386 * @file: "load" file pointer
387 *
388 * For reading, use load_seq_* seq_file reading operations.
389 */
390static int smk_open_load(struct inode *inode, struct file *file)
391{
392 return seq_open(file, &load_seq_ops);
393}
394
395/**
396 * smk_write_load - write() for /smack/load
397 * @file: file pointer, not actually used
398 * @buf: where to get the data from
399 * @count: bytes sent
400 * @ppos: where to start - must be 0
401 *
402 */
403static ssize_t smk_write_load(struct file *file, const char __user *buf,
404 size_t count, loff_t *ppos)
405{
406
407 /*
408 * Must have privilege.
409 * No partial writes.
410 * Enough data must be present.
411 */
412 if (!capable(CAP_MAC_ADMIN))
413 return -EPERM;
414
415 return smk_write_load_list(file, buf, count, ppos, &smack_rule_list,
416 &smack_list_lock);
417}
418
419static const struct file_operations smk_load_ops = {
420 .open = smk_open_load,
421 .read = seq_read,
422 .llseek = seq_lseek,
423 .write = smk_write_load,
424 .release = seq_release,
425};
426
427/**
428 * smk_cipso_doi - initialize the CIPSO domain
429 */
430static void smk_cipso_doi(void)
431{
432 int rc;
433 struct cipso_v4_doi *doip;
434 struct netlbl_audit nai;
435
436 smk_netlabel_audit_set(&nai);
437
438 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
439 if (rc != 0)
440 printk(KERN_WARNING "%s:%d remove rc = %d\n",
441 __func__, __LINE__, rc);
442
443 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
444 if (doip == NULL)
445 panic("smack: Failed to initialize cipso DOI.\n");
446 doip->map.std = NULL;
447 doip->doi = smk_cipso_doi_value;
448 doip->type = CIPSO_V4_MAP_PASS;
449 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
450 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
451 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
452
453 rc = netlbl_cfg_cipsov4_add(doip, &nai);
454 if (rc != 0) {
455 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
456 __func__, __LINE__, rc);
457 kfree(doip);
458 return;
459 }
460 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
461 if (rc != 0) {
462 printk(KERN_WARNING "%s:%d map add rc = %d\n",
463 __func__, __LINE__, rc);
464 kfree(doip);
465 return;
466 }
467}
468
469/**
470 * smk_unlbl_ambient - initialize the unlabeled domain
471 * @oldambient: previous domain string
472 */
473static void smk_unlbl_ambient(char *oldambient)
474{
475 int rc;
476 struct netlbl_audit nai;
477
478 smk_netlabel_audit_set(&nai);
479
480 if (oldambient != NULL) {
481 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
482 if (rc != 0)
483 printk(KERN_WARNING "%s:%d remove rc = %d\n",
484 __func__, __LINE__, rc);
485 }
486
487 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET,
488 NULL, NULL, &nai);
489 if (rc != 0)
490 printk(KERN_WARNING "%s:%d add rc = %d\n",
491 __func__, __LINE__, rc);
492}
493
494/*
495 * Seq_file read operations for /smack/cipso
496 */
497
498static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
499{
500 if (*pos == SEQ_READ_FINISHED)
501 return NULL;
502 if (list_empty(&smack_known_list))
503 return NULL;
504
505 return smack_known_list.next;
506}
507
508static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
509{
510 struct list_head *list = v;
511
512 /*
513 * labels with no associated cipso value wont be printed
514 * in cipso_seq_show
515 */
516 if (list_is_last(list, &smack_known_list)) {
517 *pos = SEQ_READ_FINISHED;
518 return NULL;
519 }
520
521 return list->next;
522}
523
524/*
525 * Print cipso labels in format:
526 * label level[/cat[,cat]]
527 */
528static int cipso_seq_show(struct seq_file *s, void *v)
529{
530 struct list_head *list = v;
531 struct smack_known *skp =
532 list_entry(list, struct smack_known, list);
533 struct smack_cipso *scp = skp->smk_cipso;
534 char *cbp;
535 char sep = '/';
536 int cat = 1;
537 int i;
538 unsigned char m;
539
540 if (scp == NULL)
541 return 0;
542
543 seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level);
544
545 cbp = scp->smk_catset;
546 for (i = 0; i < SMK_LABELLEN; i++)
547 for (m = 0x80; m != 0; m >>= 1) {
548 if (m & cbp[i]) {
549 seq_printf(s, "%c%d", sep, cat);
550 sep = ',';
551 }
552 cat++;
553 }
554
555 seq_putc(s, '\n');
556
557 return 0;
558}
559
560static void cipso_seq_stop(struct seq_file *s, void *v)
561{
562 /* No-op */
563}
564
565static const struct seq_operations cipso_seq_ops = {
566 .start = cipso_seq_start,
567 .stop = cipso_seq_stop,
568 .next = cipso_seq_next,
569 .show = cipso_seq_show,
570};
571
572/**
573 * smk_open_cipso - open() for /smack/cipso
574 * @inode: inode structure representing file
575 * @file: "cipso" file pointer
576 *
577 * Connect our cipso_seq_* operations with /smack/cipso
578 * file_operations
579 */
580static int smk_open_cipso(struct inode *inode, struct file *file)
581{
582 return seq_open(file, &cipso_seq_ops);
583}
584
585/**
586 * smk_write_cipso - write() for /smack/cipso
587 * @file: file pointer, not actually used
588 * @buf: where to get the data from
589 * @count: bytes sent
590 * @ppos: where to start
591 *
592 * Accepts only one cipso rule per write call.
593 * Returns number of bytes written or error code, as appropriate
594 */
595static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
596 size_t count, loff_t *ppos)
597{
598 struct smack_known *skp;
599 struct smack_cipso *scp = NULL;
600 char mapcatset[SMK_LABELLEN];
601 int maplevel;
602 int cat;
603 int catlen;
604 ssize_t rc = -EINVAL;
605 char *data = NULL;
606 char *rule;
607 int ret;
608 int i;
609
610 /*
611 * Must have privilege.
612 * No partial writes.
613 * Enough data must be present.
614 */
615 if (!capable(CAP_MAC_ADMIN))
616 return -EPERM;
617 if (*ppos != 0)
618 return -EINVAL;
619 if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)
620 return -EINVAL;
621
622 data = kzalloc(count + 1, GFP_KERNEL);
623 if (data == NULL)
624 return -ENOMEM;
625
626 if (copy_from_user(data, buf, count) != 0) {
627 rc = -EFAULT;
628 goto unlockedout;
629 }
630
631 /* labels cannot begin with a '-' */
632 if (data[0] == '-') {
633 rc = -EINVAL;
634 goto unlockedout;
635 }
636 data[count] = '\0';
637 rule = data;
638 /*
639 * Only allow one writer at a time. Writes should be
640 * quite rare and small in any case.
641 */
642 mutex_lock(&smack_cipso_lock);
643
644 skp = smk_import_entry(rule, 0);
645 if (skp == NULL)
646 goto out;
647
648 rule += SMK_LABELLEN;
649 ret = sscanf(rule, "%d", &maplevel);
650 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
651 goto out;
652
653 rule += SMK_DIGITLEN;
654 ret = sscanf(rule, "%d", &catlen);
655 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
656 goto out;
657
658 if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
659 goto out;
660
661 memset(mapcatset, 0, sizeof(mapcatset));
662
663 for (i = 0; i < catlen; i++) {
664 rule += SMK_DIGITLEN;
665 ret = sscanf(rule, "%d", &cat);
666 if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
667 goto out;
668
669 smack_catset_bit(cat, mapcatset);
670 }
671
672 if (skp->smk_cipso == NULL) {
673 scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL);
674 if (scp == NULL) {
675 rc = -ENOMEM;
676 goto out;
677 }
678 }
679
680 spin_lock_bh(&skp->smk_cipsolock);
681
682 if (scp == NULL)
683 scp = skp->smk_cipso;
684 else
685 skp->smk_cipso = scp;
686
687 scp->smk_level = maplevel;
688 memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset));
689
690 spin_unlock_bh(&skp->smk_cipsolock);
691
692 rc = count;
693out:
694 mutex_unlock(&smack_cipso_lock);
695unlockedout:
696 kfree(data);
697 return rc;
698}
699
700static const struct file_operations smk_cipso_ops = {
701 .open = smk_open_cipso,
702 .read = seq_read,
703 .llseek = seq_lseek,
704 .write = smk_write_cipso,
705 .release = seq_release,
706};
707
708/*
709 * Seq_file read operations for /smack/netlabel
710 */
711
712static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
713{
714 if (*pos == SEQ_READ_FINISHED)
715 return NULL;
716 if (list_empty(&smk_netlbladdr_list))
717 return NULL;
718 return smk_netlbladdr_list.next;
719}
720
721static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
722{
723 struct list_head *list = v;
724
725 if (list_is_last(list, &smk_netlbladdr_list)) {
726 *pos = SEQ_READ_FINISHED;
727 return NULL;
728 }
729
730 return list->next;
731}
732#define BEBITS (sizeof(__be32) * 8)
733
734/*
735 * Print host/label pairs
736 */
737static int netlbladdr_seq_show(struct seq_file *s, void *v)
738{
739 struct list_head *list = v;
740 struct smk_netlbladdr *skp =
741 list_entry(list, struct smk_netlbladdr, list);
742 unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
743 int maskn;
744 u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
745
746 for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++);
747
748 seq_printf(s, "%u.%u.%u.%u/%d %s\n",
749 hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label);
750
751 return 0;
752}
753
754static void netlbladdr_seq_stop(struct seq_file *s, void *v)
755{
756 /* No-op */
757}
758
759static const struct seq_operations netlbladdr_seq_ops = {
760 .start = netlbladdr_seq_start,
761 .stop = netlbladdr_seq_stop,
762 .next = netlbladdr_seq_next,
763 .show = netlbladdr_seq_show,
764};
765
766/**
767 * smk_open_netlbladdr - open() for /smack/netlabel
768 * @inode: inode structure representing file
769 * @file: "netlabel" file pointer
770 *
771 * Connect our netlbladdr_seq_* operations with /smack/netlabel
772 * file_operations
773 */
774static int smk_open_netlbladdr(struct inode *inode, struct file *file)
775{
776 return seq_open(file, &netlbladdr_seq_ops);
777}
778
779/**
780 * smk_netlbladdr_insert
781 * @new : netlabel to insert
782 *
783 * This helper insert netlabel in the smack_netlbladdrs list
784 * sorted by netmask length (longest to smallest)
785 * locked by &smk_netlbladdr_lock in smk_write_netlbladdr
786 *
787 */
788static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
789{
790 struct smk_netlbladdr *m, *m_next;
791
792 if (list_empty(&smk_netlbladdr_list)) {
793 list_add_rcu(&new->list, &smk_netlbladdr_list);
794 return;
795 }
796
797 m = list_entry_rcu(smk_netlbladdr_list.next,
798 struct smk_netlbladdr, list);
799
800 /* the comparison '>' is a bit hacky, but works */
801 if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
802 list_add_rcu(&new->list, &smk_netlbladdr_list);
803 return;
804 }
805
806 list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
807 if (list_is_last(&m->list, &smk_netlbladdr_list)) {
808 list_add_rcu(&new->list, &m->list);
809 return;
810 }
811 m_next = list_entry_rcu(m->list.next,
812 struct smk_netlbladdr, list);
813 if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
814 list_add_rcu(&new->list, &m->list);
815 return;
816 }
817 }
818}
819
820
821/**
822 * smk_write_netlbladdr - write() for /smack/netlabel
823 * @file: file pointer, not actually used
824 * @buf: where to get the data from
825 * @count: bytes sent
826 * @ppos: where to start
827 *
828 * Accepts only one netlbladdr per write call.
829 * Returns number of bytes written or error code, as appropriate
830 */
831static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
832 size_t count, loff_t *ppos)
833{
834 struct smk_netlbladdr *skp;
835 struct sockaddr_in newname;
836 char smack[SMK_LABELLEN];
837 char *sp;
838 char data[SMK_NETLBLADDRMAX + 1];
839 char *host = (char *)&newname.sin_addr.s_addr;
840 int rc;
841 struct netlbl_audit audit_info;
842 struct in_addr mask;
843 unsigned int m;
844 int found;
845 u32 mask_bits = (1<<31);
846 __be32 nsa;
847 u32 temp_mask;
848
849 /*
850 * Must have privilege.
851 * No partial writes.
852 * Enough data must be present.
853 * "<addr/mask, as a.b.c.d/e><space><label>"
854 * "<addr, as a.b.c.d><space><label>"
855 */
856 if (!capable(CAP_MAC_ADMIN))
857 return -EPERM;
858 if (*ppos != 0)
859 return -EINVAL;
860 if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX)
861 return -EINVAL;
862 if (copy_from_user(data, buf, count) != 0)
863 return -EFAULT;
864
865 data[count] = '\0';
866
867 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
868 &host[0], &host[1], &host[2], &host[3], &m, smack);
869 if (rc != 6) {
870 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
871 &host[0], &host[1], &host[2], &host[3], smack);
872 if (rc != 5)
873 return -EINVAL;
874 m = BEBITS;
875 }
876 if (m > BEBITS)
877 return -EINVAL;
878
879 /* if smack begins with '-', its an option, don't import it */
880 if (smack[0] != '-') {
881 sp = smk_import(smack, 0);
882 if (sp == NULL)
883 return -EINVAL;
884 } else {
885 /* check known options */
886 if (strcmp(smack, smack_cipso_option) == 0)
887 sp = (char *)smack_cipso_option;
888 else
889 return -EINVAL;
890 }
891
892 for (temp_mask = 0; m > 0; m--) {
893 temp_mask |= mask_bits;
894 mask_bits >>= 1;
895 }
896 mask.s_addr = cpu_to_be32(temp_mask);
897
898 newname.sin_addr.s_addr &= mask.s_addr;
899 /*
900 * Only allow one writer at a time. Writes should be
901 * quite rare and small in any case.
902 */
903 mutex_lock(&smk_netlbladdr_lock);
904
905 nsa = newname.sin_addr.s_addr;
906 /* try to find if the prefix is already in the list */
907 found = 0;
908 list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) {
909 if (skp->smk_host.sin_addr.s_addr == nsa &&
910 skp->smk_mask.s_addr == mask.s_addr) {
911 found = 1;
912 break;
913 }
914 }
915 smk_netlabel_audit_set(&audit_info);
916
917 if (found == 0) {
918 skp = kzalloc(sizeof(*skp), GFP_KERNEL);
919 if (skp == NULL)
920 rc = -ENOMEM;
921 else {
922 rc = 0;
923 skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
924 skp->smk_mask.s_addr = mask.s_addr;
925 skp->smk_label = sp;
926 smk_netlbladdr_insert(skp);
927 }
928 } else {
929 /* we delete the unlabeled entry, only if the previous label
930 * wasn't the special CIPSO option */
931 if (skp->smk_label != smack_cipso_option)
932 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
933 &skp->smk_host.sin_addr, &skp->smk_mask,
934 PF_INET, &audit_info);
935 else
936 rc = 0;
937 skp->smk_label = sp;
938 }
939
940 /*
941 * Now tell netlabel about the single label nature of
942 * this host so that incoming packets get labeled.
943 * but only if we didn't get the special CIPSO option
944 */
945 if (rc == 0 && sp != smack_cipso_option)
946 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
947 &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
948 smack_to_secid(skp->smk_label), &audit_info);
949
950 if (rc == 0)
951 rc = count;
952
953 mutex_unlock(&smk_netlbladdr_lock);
954
955 return rc;
956}
957
958static const struct file_operations smk_netlbladdr_ops = {
959 .open = smk_open_netlbladdr,
960 .read = seq_read,
961 .llseek = seq_lseek,
962 .write = smk_write_netlbladdr,
963 .release = seq_release,
964};
965
966/**
967 * smk_read_doi - read() for /smack/doi
968 * @filp: file pointer, not actually used
969 * @buf: where to put the result
970 * @count: maximum to send along
971 * @ppos: where to start
972 *
973 * Returns number of bytes read or error code, as appropriate
974 */
975static ssize_t smk_read_doi(struct file *filp, char __user *buf,
976 size_t count, loff_t *ppos)
977{
978 char temp[80];
979 ssize_t rc;
980
981 if (*ppos != 0)
982 return 0;
983
984 sprintf(temp, "%d", smk_cipso_doi_value);
985 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
986
987 return rc;
988}
989
990/**
991 * smk_write_doi - write() for /smack/doi
992 * @file: file pointer, not actually used
993 * @buf: where to get the data from
994 * @count: bytes sent
995 * @ppos: where to start
996 *
997 * Returns number of bytes written or error code, as appropriate
998 */
999static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1000 size_t count, loff_t *ppos)
1001{
1002 char temp[80];
1003 int i;
1004
1005 if (!capable(CAP_MAC_ADMIN))
1006 return -EPERM;
1007
1008 if (count >= sizeof(temp) || count == 0)
1009 return -EINVAL;
1010
1011 if (copy_from_user(temp, buf, count) != 0)
1012 return -EFAULT;
1013
1014 temp[count] = '\0';
1015
1016 if (sscanf(temp, "%d", &i) != 1)
1017 return -EINVAL;
1018
1019 smk_cipso_doi_value = i;
1020
1021 smk_cipso_doi();
1022
1023 return count;
1024}
1025
1026static const struct file_operations smk_doi_ops = {
1027 .read = smk_read_doi,
1028 .write = smk_write_doi,
1029 .llseek = default_llseek,
1030};
1031
1032/**
1033 * smk_read_direct - read() for /smack/direct
1034 * @filp: file pointer, not actually used
1035 * @buf: where to put the result
1036 * @count: maximum to send along
1037 * @ppos: where to start
1038 *
1039 * Returns number of bytes read or error code, as appropriate
1040 */
1041static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1042 size_t count, loff_t *ppos)
1043{
1044 char temp[80];
1045 ssize_t rc;
1046
1047 if (*ppos != 0)
1048 return 0;
1049
1050 sprintf(temp, "%d", smack_cipso_direct);
1051 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1052
1053 return rc;
1054}
1055
1056/**
1057 * smk_write_direct - write() for /smack/direct
1058 * @file: file pointer, not actually used
1059 * @buf: where to get the data from
1060 * @count: bytes sent
1061 * @ppos: where to start
1062 *
1063 * Returns number of bytes written or error code, as appropriate
1064 */
1065static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1066 size_t count, loff_t *ppos)
1067{
1068 char temp[80];
1069 int i;
1070
1071 if (!capable(CAP_MAC_ADMIN))
1072 return -EPERM;
1073
1074 if (count >= sizeof(temp) || count == 0)
1075 return -EINVAL;
1076
1077 if (copy_from_user(temp, buf, count) != 0)
1078 return -EFAULT;
1079
1080 temp[count] = '\0';
1081
1082 if (sscanf(temp, "%d", &i) != 1)
1083 return -EINVAL;
1084
1085 smack_cipso_direct = i;
1086
1087 return count;
1088}
1089
1090static const struct file_operations smk_direct_ops = {
1091 .read = smk_read_direct,
1092 .write = smk_write_direct,
1093 .llseek = default_llseek,
1094};
1095
1096/**
1097 * smk_read_ambient - read() for /smack/ambient
1098 * @filp: file pointer, not actually used
1099 * @buf: where to put the result
1100 * @cn: maximum to send along
1101 * @ppos: where to start
1102 *
1103 * Returns number of bytes read or error code, as appropriate
1104 */
1105static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1106 size_t cn, loff_t *ppos)
1107{
1108 ssize_t rc;
1109 int asize;
1110
1111 if (*ppos != 0)
1112 return 0;
1113 /*
1114 * Being careful to avoid a problem in the case where
1115 * smack_net_ambient gets changed in midstream.
1116 */
1117 mutex_lock(&smack_ambient_lock);
1118
1119 asize = strlen(smack_net_ambient) + 1;
1120
1121 if (cn >= asize)
1122 rc = simple_read_from_buffer(buf, cn, ppos,
1123 smack_net_ambient, asize);
1124 else
1125 rc = -EINVAL;
1126
1127 mutex_unlock(&smack_ambient_lock);
1128
1129 return rc;
1130}
1131
1132/**
1133 * smk_write_ambient - write() for /smack/ambient
1134 * @file: file pointer, not actually used
1135 * @buf: where to get the data from
1136 * @count: bytes sent
1137 * @ppos: where to start
1138 *
1139 * Returns number of bytes written or error code, as appropriate
1140 */
1141static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1142 size_t count, loff_t *ppos)
1143{
1144 char in[SMK_LABELLEN];
1145 char *oldambient;
1146 char *smack;
1147
1148 if (!capable(CAP_MAC_ADMIN))
1149 return -EPERM;
1150
1151 if (count >= SMK_LABELLEN)
1152 return -EINVAL;
1153
1154 if (copy_from_user(in, buf, count) != 0)
1155 return -EFAULT;
1156
1157 smack = smk_import(in, count);
1158 if (smack == NULL)
1159 return -EINVAL;
1160
1161 mutex_lock(&smack_ambient_lock);
1162
1163 oldambient = smack_net_ambient;
1164 smack_net_ambient = smack;
1165 smk_unlbl_ambient(oldambient);
1166
1167 mutex_unlock(&smack_ambient_lock);
1168
1169 return count;
1170}
1171
1172static const struct file_operations smk_ambient_ops = {
1173 .read = smk_read_ambient,
1174 .write = smk_write_ambient,
1175 .llseek = default_llseek,
1176};
1177
1178/**
1179 * smk_read_onlycap - read() for /smack/onlycap
1180 * @filp: file pointer, not actually used
1181 * @buf: where to put the result
1182 * @cn: maximum to send along
1183 * @ppos: where to start
1184 *
1185 * Returns number of bytes read or error code, as appropriate
1186 */
1187static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
1188 size_t cn, loff_t *ppos)
1189{
1190 char *smack = "";
1191 ssize_t rc = -EINVAL;
1192 int asize;
1193
1194 if (*ppos != 0)
1195 return 0;
1196
1197 if (smack_onlycap != NULL)
1198 smack = smack_onlycap;
1199
1200 asize = strlen(smack) + 1;
1201
1202 if (cn >= asize)
1203 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
1204
1205 return rc;
1206}
1207
1208/**
1209 * smk_write_onlycap - write() for /smack/onlycap
1210 * @file: file pointer, not actually used
1211 * @buf: where to get the data from
1212 * @count: bytes sent
1213 * @ppos: where to start
1214 *
1215 * Returns number of bytes written or error code, as appropriate
1216 */
1217static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1218 size_t count, loff_t *ppos)
1219{
1220 char in[SMK_LABELLEN];
1221 char *sp = smk_of_task(current->cred->security);
1222
1223 if (!capable(CAP_MAC_ADMIN))
1224 return -EPERM;
1225
1226 /*
1227 * This can be done using smk_access() but is done
1228 * explicitly for clarity. The smk_access() implementation
1229 * would use smk_access(smack_onlycap, MAY_WRITE)
1230 */
1231 if (smack_onlycap != NULL && smack_onlycap != sp)
1232 return -EPERM;
1233
1234 if (count >= SMK_LABELLEN)
1235 return -EINVAL;
1236
1237 if (copy_from_user(in, buf, count) != 0)
1238 return -EFAULT;
1239
1240 /*
1241 * Should the null string be passed in unset the onlycap value.
1242 * This seems like something to be careful with as usually
1243 * smk_import only expects to return NULL for errors. It
1244 * is usually the case that a nullstring or "\n" would be
1245 * bad to pass to smk_import but in fact this is useful here.
1246 */
1247 smack_onlycap = smk_import(in, count);
1248
1249 return count;
1250}
1251
1252static const struct file_operations smk_onlycap_ops = {
1253 .read = smk_read_onlycap,
1254 .write = smk_write_onlycap,
1255 .llseek = default_llseek,
1256};
1257
1258/**
1259 * smk_read_logging - read() for /smack/logging
1260 * @filp: file pointer, not actually used
1261 * @buf: where to put the result
1262 * @cn: maximum to send along
1263 * @ppos: where to start
1264 *
1265 * Returns number of bytes read or error code, as appropriate
1266 */
1267static ssize_t smk_read_logging(struct file *filp, char __user *buf,
1268 size_t count, loff_t *ppos)
1269{
1270 char temp[32];
1271 ssize_t rc;
1272
1273 if (*ppos != 0)
1274 return 0;
1275
1276 sprintf(temp, "%d\n", log_policy);
1277 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1278 return rc;
1279}
1280
1281/**
1282 * smk_write_logging - write() for /smack/logging
1283 * @file: file pointer, not actually used
1284 * @buf: where to get the data from
1285 * @count: bytes sent
1286 * @ppos: where to start
1287 *
1288 * Returns number of bytes written or error code, as appropriate
1289 */
1290static ssize_t smk_write_logging(struct file *file, const char __user *buf,
1291 size_t count, loff_t *ppos)
1292{
1293 char temp[32];
1294 int i;
1295
1296 if (!capable(CAP_MAC_ADMIN))
1297 return -EPERM;
1298
1299 if (count >= sizeof(temp) || count == 0)
1300 return -EINVAL;
1301
1302 if (copy_from_user(temp, buf, count) != 0)
1303 return -EFAULT;
1304
1305 temp[count] = '\0';
1306
1307 if (sscanf(temp, "%d", &i) != 1)
1308 return -EINVAL;
1309 if (i < 0 || i > 3)
1310 return -EINVAL;
1311 log_policy = i;
1312 return count;
1313}
1314
1315
1316
1317static const struct file_operations smk_logging_ops = {
1318 .read = smk_read_logging,
1319 .write = smk_write_logging,
1320 .llseek = default_llseek,
1321};
1322
1323/*
1324 * Seq_file read operations for /smack/load-self
1325 */
1326
1327static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
1328{
1329 struct task_smack *tsp = current_security();
1330
1331 if (*pos == SEQ_READ_FINISHED)
1332 return NULL;
1333 if (list_empty(&tsp->smk_rules))
1334 return NULL;
1335 return tsp->smk_rules.next;
1336}
1337
1338static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
1339{
1340 struct task_smack *tsp = current_security();
1341 struct list_head *list = v;
1342
1343 if (list_is_last(list, &tsp->smk_rules)) {
1344 *pos = SEQ_READ_FINISHED;
1345 return NULL;
1346 }
1347 return list->next;
1348}
1349
1350static int load_self_seq_show(struct seq_file *s, void *v)
1351{
1352 struct list_head *list = v;
1353 struct smack_rule *srp =
1354 list_entry(list, struct smack_rule, list);
1355
1356 seq_printf(s, "%s %s", (char *)srp->smk_subject,
1357 (char *)srp->smk_object);
1358
1359 seq_putc(s, ' ');
1360
1361 if (srp->smk_access & MAY_READ)
1362 seq_putc(s, 'r');
1363 if (srp->smk_access & MAY_WRITE)
1364 seq_putc(s, 'w');
1365 if (srp->smk_access & MAY_EXEC)
1366 seq_putc(s, 'x');
1367 if (srp->smk_access & MAY_APPEND)
1368 seq_putc(s, 'a');
1369 if (srp->smk_access & MAY_TRANSMUTE)
1370 seq_putc(s, 't');
1371 if (srp->smk_access == 0)
1372 seq_putc(s, '-');
1373
1374 seq_putc(s, '\n');
1375
1376 return 0;
1377}
1378
1379static void load_self_seq_stop(struct seq_file *s, void *v)
1380{
1381 /* No-op */
1382}
1383
1384static const struct seq_operations load_self_seq_ops = {
1385 .start = load_self_seq_start,
1386 .next = load_self_seq_next,
1387 .show = load_self_seq_show,
1388 .stop = load_self_seq_stop,
1389};
1390
1391
1392/**
1393 * smk_open_load_self - open() for /smack/load-self
1394 * @inode: inode structure representing file
1395 * @file: "load" file pointer
1396 *
1397 * For reading, use load_seq_* seq_file reading operations.
1398 */
1399static int smk_open_load_self(struct inode *inode, struct file *file)
1400{
1401 return seq_open(file, &load_self_seq_ops);
1402}
1403
1404/**
1405 * smk_write_load_self - write() for /smack/load-self
1406 * @file: file pointer, not actually used
1407 * @buf: where to get the data from
1408 * @count: bytes sent
1409 * @ppos: where to start - must be 0
1410 *
1411 */
1412static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
1413 size_t count, loff_t *ppos)
1414{
1415 struct task_smack *tsp = current_security();
1416
1417 return smk_write_load_list(file, buf, count, ppos, &tsp->smk_rules,
1418 &tsp->smk_rules_lock);
1419}
1420
1421static const struct file_operations smk_load_self_ops = {
1422 .open = smk_open_load_self,
1423 .read = seq_read,
1424 .llseek = seq_lseek,
1425 .write = smk_write_load_self,
1426 .release = seq_release,
1427};
1428/**
1429 * smk_fill_super - fill the /smackfs superblock
1430 * @sb: the empty superblock
1431 * @data: unused
1432 * @silent: unused
1433 *
1434 * Fill in the well known entries for /smack
1435 *
1436 * Returns 0 on success, an error code on failure
1437 */
1438static int smk_fill_super(struct super_block *sb, void *data, int silent)
1439{
1440 int rc;
1441 struct inode *root_inode;
1442
1443 static struct tree_descr smack_files[] = {
1444 [SMK_LOAD] = {
1445 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
1446 [SMK_CIPSO] = {
1447 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
1448 [SMK_DOI] = {
1449 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
1450 [SMK_DIRECT] = {
1451 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
1452 [SMK_AMBIENT] = {
1453 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
1454 [SMK_NETLBLADDR] = {
1455 "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
1456 [SMK_ONLYCAP] = {
1457 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
1458 [SMK_LOGGING] = {
1459 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
1460 [SMK_LOAD_SELF] = {
1461 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
1462 /* last one */
1463 {""}
1464 };
1465
1466 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
1467 if (rc != 0) {
1468 printk(KERN_ERR "%s failed %d while creating inodes\n",
1469 __func__, rc);
1470 return rc;
1471 }
1472
1473 root_inode = sb->s_root->d_inode;
1474 root_inode->i_security = new_inode_smack(smack_known_floor.smk_known);
1475
1476 return 0;
1477}
1478
1479/**
1480 * smk_mount - get the smackfs superblock
1481 * @fs_type: passed along without comment
1482 * @flags: passed along without comment
1483 * @dev_name: passed along without comment
1484 * @data: passed along without comment
1485 *
1486 * Just passes everything along.
1487 *
1488 * Returns what the lower level code does.
1489 */
1490static struct dentry *smk_mount(struct file_system_type *fs_type,
1491 int flags, const char *dev_name, void *data)
1492{
1493 return mount_single(fs_type, flags, data, smk_fill_super);
1494}
1495
1496static struct file_system_type smk_fs_type = {
1497 .name = "smackfs",
1498 .mount = smk_mount,
1499 .kill_sb = kill_litter_super,
1500};
1501
1502static struct vfsmount *smackfs_mount;
1503
1504/**
1505 * init_smk_fs - get the smackfs superblock
1506 *
1507 * register the smackfs
1508 *
1509 * Do not register smackfs if Smack wasn't enabled
1510 * on boot. We can not put this method normally under the
1511 * smack_init() code path since the security subsystem get
1512 * initialized before the vfs caches.
1513 *
1514 * Returns true if we were not chosen on boot or if
1515 * we were chosen and filesystem registration succeeded.
1516 */
1517static int __init init_smk_fs(void)
1518{
1519 int err;
1520
1521 if (!security_module_enable(&smack_ops))
1522 return 0;
1523
1524 err = register_filesystem(&smk_fs_type);
1525 if (!err) {
1526 smackfs_mount = kern_mount(&smk_fs_type);
1527 if (IS_ERR(smackfs_mount)) {
1528 printk(KERN_ERR "smackfs: could not mount!\n");
1529 err = PTR_ERR(smackfs_mount);
1530 smackfs_mount = NULL;
1531 }
1532 }
1533
1534 smk_cipso_doi();
1535 smk_unlbl_ambient(NULL);
1536
1537 return err;
1538}
1539
1540__initcall(init_smk_fs);