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1/*
2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, version 2.
7 *
8 * Authors:
9 * Casey Schaufler <casey@schaufler-ca.com>
10 * Ahmed S. Darwish <darwish.07@gmail.com>
11 *
12 * Special thanks to the authors of selinuxfs.
13 *
14 * Karl MacMillan <kmacmillan@tresys.com>
15 * James Morris <jmorris@redhat.com>
16 *
17 */
18
19#include <linux/kernel.h>
20#include <linux/vmalloc.h>
21#include <linux/security.h>
22#include <linux/mutex.h>
23#include <linux/slab.h>
24#include <net/net_namespace.h>
25#include <net/cipso_ipv4.h>
26#include <linux/seq_file.h>
27#include <linux/ctype.h>
28#include <linux/audit.h>
29#include <linux/magic.h>
30#include "smack.h"
31
32#define BEBITS (sizeof(__be32) * 8)
33/*
34 * smackfs pseudo filesystem.
35 */
36
37enum smk_inos {
38 SMK_ROOT_INO = 2,
39 SMK_LOAD = 3, /* load policy */
40 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
41 SMK_DOI = 5, /* CIPSO DOI */
42 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
43 SMK_AMBIENT = 7, /* internet ambient label */
44 SMK_NET4ADDR = 8, /* single label hosts */
45 SMK_ONLYCAP = 9, /* the only "capable" label */
46 SMK_LOGGING = 10, /* logging */
47 SMK_LOAD_SELF = 11, /* task specific rules */
48 SMK_ACCESSES = 12, /* access policy */
49 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
50 SMK_LOAD2 = 14, /* load policy with long labels */
51 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
52 SMK_ACCESS2 = 16, /* make an access check with long labels */
53 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
54 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
55 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
56 SMK_SYSLOG = 20, /* change syslog label) */
57 SMK_PTRACE = 21, /* set ptrace rule */
58#ifdef CONFIG_SECURITY_SMACK_BRINGUP
59 SMK_UNCONFINED = 22, /* define an unconfined label */
60#endif
61#if IS_ENABLED(CONFIG_IPV6)
62 SMK_NET6ADDR = 23, /* single label IPv6 hosts */
63#endif /* CONFIG_IPV6 */
64 SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
65};
66
67/*
68 * List locks
69 */
70static DEFINE_MUTEX(smack_master_list_lock);
71static DEFINE_MUTEX(smack_cipso_lock);
72static DEFINE_MUTEX(smack_ambient_lock);
73static DEFINE_MUTEX(smk_net4addr_lock);
74#if IS_ENABLED(CONFIG_IPV6)
75static DEFINE_MUTEX(smk_net6addr_lock);
76#endif /* CONFIG_IPV6 */
77
78/*
79 * This is the "ambient" label for network traffic.
80 * If it isn't somehow marked, use this.
81 * It can be reset via smackfs/ambient
82 */
83struct smack_known *smack_net_ambient;
84
85/*
86 * This is the level in a CIPSO header that indicates a
87 * smack label is contained directly in the category set.
88 * It can be reset via smackfs/direct
89 */
90int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
91
92/*
93 * This is the level in a CIPSO header that indicates a
94 * secid is contained directly in the category set.
95 * It can be reset via smackfs/mapped
96 */
97int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
98
99#ifdef CONFIG_SECURITY_SMACK_BRINGUP
100/*
101 * Allow one label to be unconfined. This is for
102 * debugging and application bring-up purposes only.
103 * It is bad and wrong, but everyone seems to expect
104 * to have it.
105 */
106struct smack_known *smack_unconfined;
107#endif
108
109/*
110 * If this value is set restrict syslog use to the label specified.
111 * It can be reset via smackfs/syslog
112 */
113struct smack_known *smack_syslog_label;
114
115/*
116 * Ptrace current rule
117 * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
118 * SMACK_PTRACE_EXACT labels must match, but can be overriden with
119 * CAP_SYS_PTRACE
120 * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect
121 */
122int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
123
124/*
125 * Certain IP addresses may be designated as single label hosts.
126 * Packets are sent there unlabeled, but only from tasks that
127 * can write to the specified label.
128 */
129
130LIST_HEAD(smk_net4addr_list);
131#if IS_ENABLED(CONFIG_IPV6)
132LIST_HEAD(smk_net6addr_list);
133#endif /* CONFIG_IPV6 */
134
135/*
136 * Rule lists are maintained for each label.
137 * This master list is just for reading /smack/load and /smack/load2.
138 */
139struct smack_master_list {
140 struct list_head list;
141 struct smack_rule *smk_rule;
142};
143
144static LIST_HEAD(smack_rule_list);
145
146struct smack_parsed_rule {
147 struct smack_known *smk_subject;
148 struct smack_known *smk_object;
149 int smk_access1;
150 int smk_access2;
151};
152
153static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
154
155/*
156 * Values for parsing cipso rules
157 * SMK_DIGITLEN: Length of a digit field in a rule.
158 * SMK_CIPSOMIN: Minimum possible cipso rule length.
159 * SMK_CIPSOMAX: Maximum possible cipso rule length.
160 */
161#define SMK_DIGITLEN 4
162#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
163#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
164
165/*
166 * Values for parsing MAC rules
167 * SMK_ACCESS: Maximum possible combination of access permissions
168 * SMK_ACCESSLEN: Maximum length for a rule access field
169 * SMK_LOADLEN: Smack rule length
170 */
171#define SMK_OACCESS "rwxa"
172#define SMK_ACCESS "rwxatl"
173#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
174#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
175#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
176#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
177
178/*
179 * Stricly for CIPSO level manipulation.
180 * Set the category bit number in a smack label sized buffer.
181 */
182static inline void smack_catset_bit(unsigned int cat, char *catsetp)
183{
184 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
185 return;
186
187 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
188}
189
190/**
191 * smk_netlabel_audit_set - fill a netlbl_audit struct
192 * @nap: structure to fill
193 */
194static void smk_netlabel_audit_set(struct netlbl_audit *nap)
195{
196 struct smack_known *skp = smk_of_current();
197
198 nap->loginuid = audit_get_loginuid(current);
199 nap->sessionid = audit_get_sessionid(current);
200 nap->secid = skp->smk_secid;
201}
202
203/*
204 * Value for parsing single label host rules
205 * "1.2.3.4 X"
206 */
207#define SMK_NETLBLADDRMIN 9
208
209/**
210 * smk_set_access - add a rule to the rule list or replace an old rule
211 * @srp: the rule to add or replace
212 * @rule_list: the list of rules
213 * @rule_lock: the rule list lock
214 * @global: if non-zero, indicates a global rule
215 *
216 * Looks through the current subject/object/access list for
217 * the subject/object pair and replaces the access that was
218 * there. If the pair isn't found add it with the specified
219 * access.
220 *
221 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
222 * during the allocation of the new pair to add.
223 */
224static int smk_set_access(struct smack_parsed_rule *srp,
225 struct list_head *rule_list,
226 struct mutex *rule_lock, int global)
227{
228 struct smack_rule *sp;
229 struct smack_master_list *smlp;
230 int found = 0;
231 int rc = 0;
232
233 mutex_lock(rule_lock);
234
235 /*
236 * Because the object label is less likely to match
237 * than the subject label check it first
238 */
239 list_for_each_entry_rcu(sp, rule_list, list) {
240 if (sp->smk_object == srp->smk_object &&
241 sp->smk_subject == srp->smk_subject) {
242 found = 1;
243 sp->smk_access |= srp->smk_access1;
244 sp->smk_access &= ~srp->smk_access2;
245 break;
246 }
247 }
248
249 if (found == 0) {
250 sp = kzalloc(sizeof(*sp), GFP_KERNEL);
251 if (sp == NULL) {
252 rc = -ENOMEM;
253 goto out;
254 }
255
256 sp->smk_subject = srp->smk_subject;
257 sp->smk_object = srp->smk_object;
258 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
259
260 list_add_rcu(&sp->list, rule_list);
261 /*
262 * If this is a global as opposed to self and a new rule
263 * it needs to get added for reporting.
264 */
265 if (global) {
266 mutex_unlock(rule_lock);
267 smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
268 if (smlp != NULL) {
269 smlp->smk_rule = sp;
270 mutex_lock(&smack_master_list_lock);
271 list_add_rcu(&smlp->list, &smack_rule_list);
272 mutex_unlock(&smack_master_list_lock);
273 } else
274 rc = -ENOMEM;
275 return rc;
276 }
277 }
278
279out:
280 mutex_unlock(rule_lock);
281 return rc;
282}
283
284/**
285 * smk_perm_from_str - parse smack accesses from a text string
286 * @string: a text string that contains a Smack accesses code
287 *
288 * Returns an integer with respective bits set for specified accesses.
289 */
290static int smk_perm_from_str(const char *string)
291{
292 int perm = 0;
293 const char *cp;
294
295 for (cp = string; ; cp++)
296 switch (*cp) {
297 case '-':
298 break;
299 case 'r':
300 case 'R':
301 perm |= MAY_READ;
302 break;
303 case 'w':
304 case 'W':
305 perm |= MAY_WRITE;
306 break;
307 case 'x':
308 case 'X':
309 perm |= MAY_EXEC;
310 break;
311 case 'a':
312 case 'A':
313 perm |= MAY_APPEND;
314 break;
315 case 't':
316 case 'T':
317 perm |= MAY_TRANSMUTE;
318 break;
319 case 'l':
320 case 'L':
321 perm |= MAY_LOCK;
322 break;
323 case 'b':
324 case 'B':
325 perm |= MAY_BRINGUP;
326 break;
327 default:
328 return perm;
329 }
330}
331
332/**
333 * smk_fill_rule - Fill Smack rule from strings
334 * @subject: subject label string
335 * @object: object label string
336 * @access1: access string
337 * @access2: string with permissions to be removed
338 * @rule: Smack rule
339 * @import: if non-zero, import labels
340 * @len: label length limit
341 *
342 * Returns 0 on success, appropriate error code on failure.
343 */
344static int smk_fill_rule(const char *subject, const char *object,
345 const char *access1, const char *access2,
346 struct smack_parsed_rule *rule, int import,
347 int len)
348{
349 const char *cp;
350 struct smack_known *skp;
351
352 if (import) {
353 rule->smk_subject = smk_import_entry(subject, len);
354 if (IS_ERR(rule->smk_subject))
355 return PTR_ERR(rule->smk_subject);
356
357 rule->smk_object = smk_import_entry(object, len);
358 if (IS_ERR(rule->smk_object))
359 return PTR_ERR(rule->smk_object);
360 } else {
361 cp = smk_parse_smack(subject, len);
362 if (IS_ERR(cp))
363 return PTR_ERR(cp);
364 skp = smk_find_entry(cp);
365 kfree(cp);
366 if (skp == NULL)
367 return -ENOENT;
368 rule->smk_subject = skp;
369
370 cp = smk_parse_smack(object, len);
371 if (IS_ERR(cp))
372 return PTR_ERR(cp);
373 skp = smk_find_entry(cp);
374 kfree(cp);
375 if (skp == NULL)
376 return -ENOENT;
377 rule->smk_object = skp;
378 }
379
380 rule->smk_access1 = smk_perm_from_str(access1);
381 if (access2)
382 rule->smk_access2 = smk_perm_from_str(access2);
383 else
384 rule->smk_access2 = ~rule->smk_access1;
385
386 return 0;
387}
388
389/**
390 * smk_parse_rule - parse Smack rule from load string
391 * @data: string to be parsed whose size is SMK_LOADLEN
392 * @rule: Smack rule
393 * @import: if non-zero, import labels
394 *
395 * Returns 0 on success, -1 on errors.
396 */
397static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
398 int import)
399{
400 int rc;
401
402 rc = smk_fill_rule(data, data + SMK_LABELLEN,
403 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
404 import, SMK_LABELLEN);
405 return rc;
406}
407
408/**
409 * smk_parse_long_rule - parse Smack rule from rule string
410 * @data: string to be parsed, null terminated
411 * @rule: Will be filled with Smack parsed rule
412 * @import: if non-zero, import labels
413 * @tokens: numer of substrings expected in data
414 *
415 * Returns number of processed bytes on success, -ERRNO on failure.
416 */
417static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
418 int import, int tokens)
419{
420 ssize_t cnt = 0;
421 char *tok[4];
422 int rc;
423 int i;
424
425 /*
426 * Parsing the rule in-place, filling all white-spaces with '\0'
427 */
428 for (i = 0; i < tokens; ++i) {
429 while (isspace(data[cnt]))
430 data[cnt++] = '\0';
431
432 if (data[cnt] == '\0')
433 /* Unexpected end of data */
434 return -EINVAL;
435
436 tok[i] = data + cnt;
437
438 while (data[cnt] && !isspace(data[cnt]))
439 ++cnt;
440 }
441 while (isspace(data[cnt]))
442 data[cnt++] = '\0';
443
444 while (i < 4)
445 tok[i++] = NULL;
446
447 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
448 return rc == 0 ? cnt : rc;
449}
450
451#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
452#define SMK_LONG_FMT 1 /* Variable long label format */
453#define SMK_CHANGE_FMT 2 /* Rule modification format */
454/**
455 * smk_write_rules_list - write() for any /smack rule file
456 * @file: file pointer, not actually used
457 * @buf: where to get the data from
458 * @count: bytes sent
459 * @ppos: where to start - must be 0
460 * @rule_list: the list of rules to write to
461 * @rule_lock: lock for the rule list
462 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
463 *
464 * Get one smack access rule from above.
465 * The format for SMK_LONG_FMT is:
466 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
467 * The format for SMK_FIXED24_FMT is exactly:
468 * "subject object rwxat"
469 * The format for SMK_CHANGE_FMT is:
470 * "subject<whitespace>object<whitespace>
471 * acc_enable<whitespace>acc_disable[<whitespace>...]"
472 */
473static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
474 size_t count, loff_t *ppos,
475 struct list_head *rule_list,
476 struct mutex *rule_lock, int format)
477{
478 struct smack_parsed_rule rule;
479 char *data;
480 int rc;
481 int trunc = 0;
482 int tokens;
483 ssize_t cnt = 0;
484
485 /*
486 * No partial writes.
487 * Enough data must be present.
488 */
489 if (*ppos != 0)
490 return -EINVAL;
491
492 if (format == SMK_FIXED24_FMT) {
493 /*
494 * Minor hack for backward compatibility
495 */
496 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
497 return -EINVAL;
498 } else {
499 if (count >= PAGE_SIZE) {
500 count = PAGE_SIZE - 1;
501 trunc = 1;
502 }
503 }
504
505 data = memdup_user_nul(buf, count);
506 if (IS_ERR(data))
507 return PTR_ERR(data);
508
509 /*
510 * In case of parsing only part of user buf,
511 * avoid having partial rule at the data buffer
512 */
513 if (trunc) {
514 while (count > 0 && (data[count - 1] != '\n'))
515 --count;
516 if (count == 0) {
517 rc = -EINVAL;
518 goto out;
519 }
520 }
521
522 data[count] = '\0';
523 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
524 while (cnt < count) {
525 if (format == SMK_FIXED24_FMT) {
526 rc = smk_parse_rule(data, &rule, 1);
527 if (rc < 0)
528 goto out;
529 cnt = count;
530 } else {
531 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
532 if (rc < 0)
533 goto out;
534 if (rc == 0) {
535 rc = -EINVAL;
536 goto out;
537 }
538 cnt += rc;
539 }
540
541 if (rule_list == NULL)
542 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
543 &rule.smk_subject->smk_rules_lock, 1);
544 else
545 rc = smk_set_access(&rule, rule_list, rule_lock, 0);
546
547 if (rc)
548 goto out;
549 }
550
551 rc = cnt;
552out:
553 kfree(data);
554 return rc;
555}
556
557/*
558 * Core logic for smackfs seq list operations.
559 */
560
561static void *smk_seq_start(struct seq_file *s, loff_t *pos,
562 struct list_head *head)
563{
564 struct list_head *list;
565 int i = *pos;
566
567 rcu_read_lock();
568 for (list = rcu_dereference(list_next_rcu(head));
569 list != head;
570 list = rcu_dereference(list_next_rcu(list))) {
571 if (i-- == 0)
572 return list;
573 }
574
575 return NULL;
576}
577
578static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
579 struct list_head *head)
580{
581 struct list_head *list = v;
582
583 ++*pos;
584 list = rcu_dereference(list_next_rcu(list));
585
586 return (list == head) ? NULL : list;
587}
588
589static void smk_seq_stop(struct seq_file *s, void *v)
590{
591 rcu_read_unlock();
592}
593
594static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
595{
596 /*
597 * Don't show any rules with label names too long for
598 * interface file (/smack/load or /smack/load2)
599 * because you should expect to be able to write
600 * anything you read back.
601 */
602 if (strlen(srp->smk_subject->smk_known) >= max ||
603 strlen(srp->smk_object->smk_known) >= max)
604 return;
605
606 if (srp->smk_access == 0)
607 return;
608
609 seq_printf(s, "%s %s",
610 srp->smk_subject->smk_known,
611 srp->smk_object->smk_known);
612
613 seq_putc(s, ' ');
614
615 if (srp->smk_access & MAY_READ)
616 seq_putc(s, 'r');
617 if (srp->smk_access & MAY_WRITE)
618 seq_putc(s, 'w');
619 if (srp->smk_access & MAY_EXEC)
620 seq_putc(s, 'x');
621 if (srp->smk_access & MAY_APPEND)
622 seq_putc(s, 'a');
623 if (srp->smk_access & MAY_TRANSMUTE)
624 seq_putc(s, 't');
625 if (srp->smk_access & MAY_LOCK)
626 seq_putc(s, 'l');
627 if (srp->smk_access & MAY_BRINGUP)
628 seq_putc(s, 'b');
629
630 seq_putc(s, '\n');
631}
632
633/*
634 * Seq_file read operations for /smack/load
635 */
636
637static void *load2_seq_start(struct seq_file *s, loff_t *pos)
638{
639 return smk_seq_start(s, pos, &smack_rule_list);
640}
641
642static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
643{
644 return smk_seq_next(s, v, pos, &smack_rule_list);
645}
646
647static int load_seq_show(struct seq_file *s, void *v)
648{
649 struct list_head *list = v;
650 struct smack_master_list *smlp =
651 list_entry_rcu(list, struct smack_master_list, list);
652
653 smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);
654
655 return 0;
656}
657
658static const struct seq_operations load_seq_ops = {
659 .start = load2_seq_start,
660 .next = load2_seq_next,
661 .show = load_seq_show,
662 .stop = smk_seq_stop,
663};
664
665/**
666 * smk_open_load - open() for /smack/load
667 * @inode: inode structure representing file
668 * @file: "load" file pointer
669 *
670 * For reading, use load_seq_* seq_file reading operations.
671 */
672static int smk_open_load(struct inode *inode, struct file *file)
673{
674 return seq_open(file, &load_seq_ops);
675}
676
677/**
678 * smk_write_load - write() for /smack/load
679 * @file: file pointer, not actually used
680 * @buf: where to get the data from
681 * @count: bytes sent
682 * @ppos: where to start - must be 0
683 *
684 */
685static ssize_t smk_write_load(struct file *file, const char __user *buf,
686 size_t count, loff_t *ppos)
687{
688 /*
689 * Must have privilege.
690 * No partial writes.
691 * Enough data must be present.
692 */
693 if (!smack_privileged(CAP_MAC_ADMIN))
694 return -EPERM;
695
696 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
697 SMK_FIXED24_FMT);
698}
699
700static const struct file_operations smk_load_ops = {
701 .open = smk_open_load,
702 .read = seq_read,
703 .llseek = seq_lseek,
704 .write = smk_write_load,
705 .release = seq_release,
706};
707
708/**
709 * smk_cipso_doi - initialize the CIPSO domain
710 */
711static void smk_cipso_doi(void)
712{
713 int rc;
714 struct cipso_v4_doi *doip;
715 struct netlbl_audit nai;
716
717 smk_netlabel_audit_set(&nai);
718
719 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
720 if (rc != 0)
721 printk(KERN_WARNING "%s:%d remove rc = %d\n",
722 __func__, __LINE__, rc);
723
724 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
725 if (doip == NULL)
726 panic("smack: Failed to initialize cipso DOI.\n");
727 doip->map.std = NULL;
728 doip->doi = smk_cipso_doi_value;
729 doip->type = CIPSO_V4_MAP_PASS;
730 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
731 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
732 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
733
734 rc = netlbl_cfg_cipsov4_add(doip, &nai);
735 if (rc != 0) {
736 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
737 __func__, __LINE__, rc);
738 kfree(doip);
739 return;
740 }
741 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
742 if (rc != 0) {
743 printk(KERN_WARNING "%s:%d map add rc = %d\n",
744 __func__, __LINE__, rc);
745 kfree(doip);
746 return;
747 }
748}
749
750/**
751 * smk_unlbl_ambient - initialize the unlabeled domain
752 * @oldambient: previous domain string
753 */
754static void smk_unlbl_ambient(char *oldambient)
755{
756 int rc;
757 struct netlbl_audit nai;
758
759 smk_netlabel_audit_set(&nai);
760
761 if (oldambient != NULL) {
762 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
763 if (rc != 0)
764 printk(KERN_WARNING "%s:%d remove rc = %d\n",
765 __func__, __LINE__, rc);
766 }
767 if (smack_net_ambient == NULL)
768 smack_net_ambient = &smack_known_floor;
769
770 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
771 NULL, NULL, &nai);
772 if (rc != 0)
773 printk(KERN_WARNING "%s:%d add rc = %d\n",
774 __func__, __LINE__, rc);
775}
776
777/*
778 * Seq_file read operations for /smack/cipso
779 */
780
781static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
782{
783 return smk_seq_start(s, pos, &smack_known_list);
784}
785
786static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
787{
788 return smk_seq_next(s, v, pos, &smack_known_list);
789}
790
791/*
792 * Print cipso labels in format:
793 * label level[/cat[,cat]]
794 */
795static int cipso_seq_show(struct seq_file *s, void *v)
796{
797 struct list_head *list = v;
798 struct smack_known *skp =
799 list_entry_rcu(list, struct smack_known, list);
800 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
801 char sep = '/';
802 int i;
803
804 /*
805 * Don't show a label that could not have been set using
806 * /smack/cipso. This is in support of the notion that
807 * anything read from /smack/cipso ought to be writeable
808 * to /smack/cipso.
809 *
810 * /smack/cipso2 should be used instead.
811 */
812 if (strlen(skp->smk_known) >= SMK_LABELLEN)
813 return 0;
814
815 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
816
817 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
818 i = netlbl_catmap_walk(cmp, i + 1)) {
819 seq_printf(s, "%c%d", sep, i);
820 sep = ',';
821 }
822
823 seq_putc(s, '\n');
824
825 return 0;
826}
827
828static const struct seq_operations cipso_seq_ops = {
829 .start = cipso_seq_start,
830 .next = cipso_seq_next,
831 .show = cipso_seq_show,
832 .stop = smk_seq_stop,
833};
834
835/**
836 * smk_open_cipso - open() for /smack/cipso
837 * @inode: inode structure representing file
838 * @file: "cipso" file pointer
839 *
840 * Connect our cipso_seq_* operations with /smack/cipso
841 * file_operations
842 */
843static int smk_open_cipso(struct inode *inode, struct file *file)
844{
845 return seq_open(file, &cipso_seq_ops);
846}
847
848/**
849 * smk_set_cipso - do the work for write() for cipso and cipso2
850 * @file: file pointer, not actually used
851 * @buf: where to get the data from
852 * @count: bytes sent
853 * @ppos: where to start
854 * @format: /smack/cipso or /smack/cipso2
855 *
856 * Accepts only one cipso rule per write call.
857 * Returns number of bytes written or error code, as appropriate
858 */
859static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
860 size_t count, loff_t *ppos, int format)
861{
862 struct smack_known *skp;
863 struct netlbl_lsm_secattr ncats;
864 char mapcatset[SMK_CIPSOLEN];
865 int maplevel;
866 unsigned int cat;
867 int catlen;
868 ssize_t rc = -EINVAL;
869 char *data = NULL;
870 char *rule;
871 int ret;
872 int i;
873
874 /*
875 * Must have privilege.
876 * No partial writes.
877 * Enough data must be present.
878 */
879 if (!smack_privileged(CAP_MAC_ADMIN))
880 return -EPERM;
881 if (*ppos != 0)
882 return -EINVAL;
883 if (format == SMK_FIXED24_FMT &&
884 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
885 return -EINVAL;
886
887 data = memdup_user_nul(buf, count);
888 if (IS_ERR(data))
889 return PTR_ERR(data);
890
891 rule = data;
892 /*
893 * Only allow one writer at a time. Writes should be
894 * quite rare and small in any case.
895 */
896 mutex_lock(&smack_cipso_lock);
897
898 skp = smk_import_entry(rule, 0);
899 if (IS_ERR(skp)) {
900 rc = PTR_ERR(skp);
901 goto out;
902 }
903
904 if (format == SMK_FIXED24_FMT)
905 rule += SMK_LABELLEN;
906 else
907 rule += strlen(skp->smk_known) + 1;
908
909 ret = sscanf(rule, "%d", &maplevel);
910 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
911 goto out;
912
913 rule += SMK_DIGITLEN;
914 ret = sscanf(rule, "%d", &catlen);
915 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
916 goto out;
917
918 if (format == SMK_FIXED24_FMT &&
919 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
920 goto out;
921
922 memset(mapcatset, 0, sizeof(mapcatset));
923
924 for (i = 0; i < catlen; i++) {
925 rule += SMK_DIGITLEN;
926 ret = sscanf(rule, "%u", &cat);
927 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
928 goto out;
929
930 smack_catset_bit(cat, mapcatset);
931 }
932
933 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
934 if (rc >= 0) {
935 netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat);
936 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
937 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
938 rc = count;
939 }
940
941out:
942 mutex_unlock(&smack_cipso_lock);
943 kfree(data);
944 return rc;
945}
946
947/**
948 * smk_write_cipso - write() for /smack/cipso
949 * @file: file pointer, not actually used
950 * @buf: where to get the data from
951 * @count: bytes sent
952 * @ppos: where to start
953 *
954 * Accepts only one cipso rule per write call.
955 * Returns number of bytes written or error code, as appropriate
956 */
957static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
958 size_t count, loff_t *ppos)
959{
960 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
961}
962
963static const struct file_operations smk_cipso_ops = {
964 .open = smk_open_cipso,
965 .read = seq_read,
966 .llseek = seq_lseek,
967 .write = smk_write_cipso,
968 .release = seq_release,
969};
970
971/*
972 * Seq_file read operations for /smack/cipso2
973 */
974
975/*
976 * Print cipso labels in format:
977 * label level[/cat[,cat]]
978 */
979static int cipso2_seq_show(struct seq_file *s, void *v)
980{
981 struct list_head *list = v;
982 struct smack_known *skp =
983 list_entry_rcu(list, struct smack_known, list);
984 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
985 char sep = '/';
986 int i;
987
988 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
989
990 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
991 i = netlbl_catmap_walk(cmp, i + 1)) {
992 seq_printf(s, "%c%d", sep, i);
993 sep = ',';
994 }
995
996 seq_putc(s, '\n');
997
998 return 0;
999}
1000
1001static const struct seq_operations cipso2_seq_ops = {
1002 .start = cipso_seq_start,
1003 .next = cipso_seq_next,
1004 .show = cipso2_seq_show,
1005 .stop = smk_seq_stop,
1006};
1007
1008/**
1009 * smk_open_cipso2 - open() for /smack/cipso2
1010 * @inode: inode structure representing file
1011 * @file: "cipso2" file pointer
1012 *
1013 * Connect our cipso_seq_* operations with /smack/cipso2
1014 * file_operations
1015 */
1016static int smk_open_cipso2(struct inode *inode, struct file *file)
1017{
1018 return seq_open(file, &cipso2_seq_ops);
1019}
1020
1021/**
1022 * smk_write_cipso2 - write() for /smack/cipso2
1023 * @file: file pointer, not actually used
1024 * @buf: where to get the data from
1025 * @count: bytes sent
1026 * @ppos: where to start
1027 *
1028 * Accepts only one cipso rule per write call.
1029 * Returns number of bytes written or error code, as appropriate
1030 */
1031static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1032 size_t count, loff_t *ppos)
1033{
1034 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1035}
1036
1037static const struct file_operations smk_cipso2_ops = {
1038 .open = smk_open_cipso2,
1039 .read = seq_read,
1040 .llseek = seq_lseek,
1041 .write = smk_write_cipso2,
1042 .release = seq_release,
1043};
1044
1045/*
1046 * Seq_file read operations for /smack/netlabel
1047 */
1048
1049static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1050{
1051 return smk_seq_start(s, pos, &smk_net4addr_list);
1052}
1053
1054static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1055{
1056 return smk_seq_next(s, v, pos, &smk_net4addr_list);
1057}
1058
1059/*
1060 * Print host/label pairs
1061 */
1062static int net4addr_seq_show(struct seq_file *s, void *v)
1063{
1064 struct list_head *list = v;
1065 struct smk_net4addr *skp =
1066 list_entry_rcu(list, struct smk_net4addr, list);
1067 char *kp = SMACK_CIPSO_OPTION;
1068
1069 if (skp->smk_label != NULL)
1070 kp = skp->smk_label->smk_known;
1071 seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1072 skp->smk_masks, kp);
1073
1074 return 0;
1075}
1076
1077static const struct seq_operations net4addr_seq_ops = {
1078 .start = net4addr_seq_start,
1079 .next = net4addr_seq_next,
1080 .show = net4addr_seq_show,
1081 .stop = smk_seq_stop,
1082};
1083
1084/**
1085 * smk_open_net4addr - open() for /smack/netlabel
1086 * @inode: inode structure representing file
1087 * @file: "netlabel" file pointer
1088 *
1089 * Connect our net4addr_seq_* operations with /smack/netlabel
1090 * file_operations
1091 */
1092static int smk_open_net4addr(struct inode *inode, struct file *file)
1093{
1094 return seq_open(file, &net4addr_seq_ops);
1095}
1096
1097/**
1098 * smk_net4addr_insert
1099 * @new : netlabel to insert
1100 *
1101 * This helper insert netlabel in the smack_net4addrs list
1102 * sorted by netmask length (longest to smallest)
1103 * locked by &smk_net4addr_lock in smk_write_net4addr
1104 *
1105 */
1106static void smk_net4addr_insert(struct smk_net4addr *new)
1107{
1108 struct smk_net4addr *m;
1109 struct smk_net4addr *m_next;
1110
1111 if (list_empty(&smk_net4addr_list)) {
1112 list_add_rcu(&new->list, &smk_net4addr_list);
1113 return;
1114 }
1115
1116 m = list_entry_rcu(smk_net4addr_list.next,
1117 struct smk_net4addr, list);
1118
1119 /* the comparison '>' is a bit hacky, but works */
1120 if (new->smk_masks > m->smk_masks) {
1121 list_add_rcu(&new->list, &smk_net4addr_list);
1122 return;
1123 }
1124
1125 list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1126 if (list_is_last(&m->list, &smk_net4addr_list)) {
1127 list_add_rcu(&new->list, &m->list);
1128 return;
1129 }
1130 m_next = list_entry_rcu(m->list.next,
1131 struct smk_net4addr, list);
1132 if (new->smk_masks > m_next->smk_masks) {
1133 list_add_rcu(&new->list, &m->list);
1134 return;
1135 }
1136 }
1137}
1138
1139
1140/**
1141 * smk_write_net4addr - write() for /smack/netlabel
1142 * @file: file pointer, not actually used
1143 * @buf: where to get the data from
1144 * @count: bytes sent
1145 * @ppos: where to start
1146 *
1147 * Accepts only one net4addr per write call.
1148 * Returns number of bytes written or error code, as appropriate
1149 */
1150static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1151 size_t count, loff_t *ppos)
1152{
1153 struct smk_net4addr *snp;
1154 struct sockaddr_in newname;
1155 char *smack;
1156 struct smack_known *skp = NULL;
1157 char *data;
1158 char *host = (char *)&newname.sin_addr.s_addr;
1159 int rc;
1160 struct netlbl_audit audit_info;
1161 struct in_addr mask;
1162 unsigned int m;
1163 unsigned int masks;
1164 int found;
1165 u32 mask_bits = (1<<31);
1166 __be32 nsa;
1167 u32 temp_mask;
1168
1169 /*
1170 * Must have privilege.
1171 * No partial writes.
1172 * Enough data must be present.
1173 * "<addr/mask, as a.b.c.d/e><space><label>"
1174 * "<addr, as a.b.c.d><space><label>"
1175 */
1176 if (!smack_privileged(CAP_MAC_ADMIN))
1177 return -EPERM;
1178 if (*ppos != 0)
1179 return -EINVAL;
1180 if (count < SMK_NETLBLADDRMIN)
1181 return -EINVAL;
1182
1183 data = memdup_user_nul(buf, count);
1184 if (IS_ERR(data))
1185 return PTR_ERR(data);
1186
1187 smack = kzalloc(count + 1, GFP_KERNEL);
1188 if (smack == NULL) {
1189 rc = -ENOMEM;
1190 goto free_data_out;
1191 }
1192
1193 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1194 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1195 if (rc != 6) {
1196 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1197 &host[0], &host[1], &host[2], &host[3], smack);
1198 if (rc != 5) {
1199 rc = -EINVAL;
1200 goto free_out;
1201 }
1202 m = BEBITS;
1203 masks = 32;
1204 }
1205 if (masks > BEBITS) {
1206 rc = -EINVAL;
1207 goto free_out;
1208 }
1209
1210 /*
1211 * If smack begins with '-', it is an option, don't import it
1212 */
1213 if (smack[0] != '-') {
1214 skp = smk_import_entry(smack, 0);
1215 if (IS_ERR(skp)) {
1216 rc = PTR_ERR(skp);
1217 goto free_out;
1218 }
1219 } else {
1220 /*
1221 * Only the -CIPSO option is supported for IPv4
1222 */
1223 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1224 rc = -EINVAL;
1225 goto free_out;
1226 }
1227 }
1228
1229 for (m = masks, temp_mask = 0; m > 0; m--) {
1230 temp_mask |= mask_bits;
1231 mask_bits >>= 1;
1232 }
1233 mask.s_addr = cpu_to_be32(temp_mask);
1234
1235 newname.sin_addr.s_addr &= mask.s_addr;
1236 /*
1237 * Only allow one writer at a time. Writes should be
1238 * quite rare and small in any case.
1239 */
1240 mutex_lock(&smk_net4addr_lock);
1241
1242 nsa = newname.sin_addr.s_addr;
1243 /* try to find if the prefix is already in the list */
1244 found = 0;
1245 list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1246 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1247 found = 1;
1248 break;
1249 }
1250 }
1251 smk_netlabel_audit_set(&audit_info);
1252
1253 if (found == 0) {
1254 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1255 if (snp == NULL)
1256 rc = -ENOMEM;
1257 else {
1258 rc = 0;
1259 snp->smk_host.s_addr = newname.sin_addr.s_addr;
1260 snp->smk_mask.s_addr = mask.s_addr;
1261 snp->smk_label = skp;
1262 snp->smk_masks = masks;
1263 smk_net4addr_insert(snp);
1264 }
1265 } else {
1266 /*
1267 * Delete the unlabeled entry, only if the previous label
1268 * wasn't the special CIPSO option
1269 */
1270 if (snp->smk_label != NULL)
1271 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1272 &snp->smk_host, &snp->smk_mask,
1273 PF_INET, &audit_info);
1274 else
1275 rc = 0;
1276 snp->smk_label = skp;
1277 }
1278
1279 /*
1280 * Now tell netlabel about the single label nature of
1281 * this host so that incoming packets get labeled.
1282 * but only if we didn't get the special CIPSO option
1283 */
1284 if (rc == 0 && skp != NULL)
1285 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1286 &snp->smk_host, &snp->smk_mask, PF_INET,
1287 snp->smk_label->smk_secid, &audit_info);
1288
1289 if (rc == 0)
1290 rc = count;
1291
1292 mutex_unlock(&smk_net4addr_lock);
1293
1294free_out:
1295 kfree(smack);
1296free_data_out:
1297 kfree(data);
1298
1299 return rc;
1300}
1301
1302static const struct file_operations smk_net4addr_ops = {
1303 .open = smk_open_net4addr,
1304 .read = seq_read,
1305 .llseek = seq_lseek,
1306 .write = smk_write_net4addr,
1307 .release = seq_release,
1308};
1309
1310#if IS_ENABLED(CONFIG_IPV6)
1311/*
1312 * Seq_file read operations for /smack/netlabel6
1313 */
1314
1315static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1316{
1317 return smk_seq_start(s, pos, &smk_net6addr_list);
1318}
1319
1320static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1321{
1322 return smk_seq_next(s, v, pos, &smk_net6addr_list);
1323}
1324
1325/*
1326 * Print host/label pairs
1327 */
1328static int net6addr_seq_show(struct seq_file *s, void *v)
1329{
1330 struct list_head *list = v;
1331 struct smk_net6addr *skp =
1332 list_entry(list, struct smk_net6addr, list);
1333
1334 if (skp->smk_label != NULL)
1335 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1336 skp->smk_label->smk_known);
1337
1338 return 0;
1339}
1340
1341static const struct seq_operations net6addr_seq_ops = {
1342 .start = net6addr_seq_start,
1343 .next = net6addr_seq_next,
1344 .show = net6addr_seq_show,
1345 .stop = smk_seq_stop,
1346};
1347
1348/**
1349 * smk_open_net6addr - open() for /smack/netlabel
1350 * @inode: inode structure representing file
1351 * @file: "netlabel" file pointer
1352 *
1353 * Connect our net6addr_seq_* operations with /smack/netlabel
1354 * file_operations
1355 */
1356static int smk_open_net6addr(struct inode *inode, struct file *file)
1357{
1358 return seq_open(file, &net6addr_seq_ops);
1359}
1360
1361/**
1362 * smk_net6addr_insert
1363 * @new : entry to insert
1364 *
1365 * This inserts an entry in the smack_net6addrs list
1366 * sorted by netmask length (longest to smallest)
1367 * locked by &smk_net6addr_lock in smk_write_net6addr
1368 *
1369 */
1370static void smk_net6addr_insert(struct smk_net6addr *new)
1371{
1372 struct smk_net6addr *m_next;
1373 struct smk_net6addr *m;
1374
1375 if (list_empty(&smk_net6addr_list)) {
1376 list_add_rcu(&new->list, &smk_net6addr_list);
1377 return;
1378 }
1379
1380 m = list_entry_rcu(smk_net6addr_list.next,
1381 struct smk_net6addr, list);
1382
1383 if (new->smk_masks > m->smk_masks) {
1384 list_add_rcu(&new->list, &smk_net6addr_list);
1385 return;
1386 }
1387
1388 list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1389 if (list_is_last(&m->list, &smk_net6addr_list)) {
1390 list_add_rcu(&new->list, &m->list);
1391 return;
1392 }
1393 m_next = list_entry_rcu(m->list.next,
1394 struct smk_net6addr, list);
1395 if (new->smk_masks > m_next->smk_masks) {
1396 list_add_rcu(&new->list, &m->list);
1397 return;
1398 }
1399 }
1400}
1401
1402
1403/**
1404 * smk_write_net6addr - write() for /smack/netlabel
1405 * @file: file pointer, not actually used
1406 * @buf: where to get the data from
1407 * @count: bytes sent
1408 * @ppos: where to start
1409 *
1410 * Accepts only one net6addr per write call.
1411 * Returns number of bytes written or error code, as appropriate
1412 */
1413static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1414 size_t count, loff_t *ppos)
1415{
1416 struct smk_net6addr *snp;
1417 struct in6_addr newname;
1418 struct in6_addr fullmask;
1419 struct smack_known *skp = NULL;
1420 char *smack;
1421 char *data;
1422 int rc = 0;
1423 int found = 0;
1424 int i;
1425 unsigned int scanned[8];
1426 unsigned int m;
1427 unsigned int mask = 128;
1428
1429 /*
1430 * Must have privilege.
1431 * No partial writes.
1432 * Enough data must be present.
1433 * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1434 * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1435 */
1436 if (!smack_privileged(CAP_MAC_ADMIN))
1437 return -EPERM;
1438 if (*ppos != 0)
1439 return -EINVAL;
1440 if (count < SMK_NETLBLADDRMIN)
1441 return -EINVAL;
1442
1443 data = memdup_user_nul(buf, count);
1444 if (IS_ERR(data))
1445 return PTR_ERR(data);
1446
1447 smack = kzalloc(count + 1, GFP_KERNEL);
1448 if (smack == NULL) {
1449 rc = -ENOMEM;
1450 goto free_data_out;
1451 }
1452
1453 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1454 &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1455 &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1456 &mask, smack);
1457 if (i != 10) {
1458 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1459 &scanned[0], &scanned[1], &scanned[2],
1460 &scanned[3], &scanned[4], &scanned[5],
1461 &scanned[6], &scanned[7], smack);
1462 if (i != 9) {
1463 rc = -EINVAL;
1464 goto free_out;
1465 }
1466 }
1467 if (mask > 128) {
1468 rc = -EINVAL;
1469 goto free_out;
1470 }
1471 for (i = 0; i < 8; i++) {
1472 if (scanned[i] > 0xffff) {
1473 rc = -EINVAL;
1474 goto free_out;
1475 }
1476 newname.s6_addr16[i] = htons(scanned[i]);
1477 }
1478
1479 /*
1480 * If smack begins with '-', it is an option, don't import it
1481 */
1482 if (smack[0] != '-') {
1483 skp = smk_import_entry(smack, 0);
1484 if (IS_ERR(skp)) {
1485 rc = PTR_ERR(skp);
1486 goto free_out;
1487 }
1488 } else {
1489 /*
1490 * Only -DELETE is supported for IPv6
1491 */
1492 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1493 rc = -EINVAL;
1494 goto free_out;
1495 }
1496 }
1497
1498 for (i = 0, m = mask; i < 8; i++) {
1499 if (m >= 16) {
1500 fullmask.s6_addr16[i] = 0xffff;
1501 m -= 16;
1502 } else if (m > 0) {
1503 fullmask.s6_addr16[i] = (1 << m) - 1;
1504 m = 0;
1505 } else
1506 fullmask.s6_addr16[i] = 0;
1507 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1508 }
1509
1510 /*
1511 * Only allow one writer at a time. Writes should be
1512 * quite rare and small in any case.
1513 */
1514 mutex_lock(&smk_net6addr_lock);
1515 /*
1516 * Try to find the prefix in the list
1517 */
1518 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1519 if (mask != snp->smk_masks)
1520 continue;
1521 for (found = 1, i = 0; i < 8; i++) {
1522 if (newname.s6_addr16[i] !=
1523 snp->smk_host.s6_addr16[i]) {
1524 found = 0;
1525 break;
1526 }
1527 }
1528 if (found == 1)
1529 break;
1530 }
1531 if (found == 0) {
1532 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1533 if (snp == NULL)
1534 rc = -ENOMEM;
1535 else {
1536 snp->smk_host = newname;
1537 snp->smk_mask = fullmask;
1538 snp->smk_masks = mask;
1539 snp->smk_label = skp;
1540 smk_net6addr_insert(snp);
1541 }
1542 } else {
1543 snp->smk_label = skp;
1544 }
1545
1546 if (rc == 0)
1547 rc = count;
1548
1549 mutex_unlock(&smk_net6addr_lock);
1550
1551free_out:
1552 kfree(smack);
1553free_data_out:
1554 kfree(data);
1555
1556 return rc;
1557}
1558
1559static const struct file_operations smk_net6addr_ops = {
1560 .open = smk_open_net6addr,
1561 .read = seq_read,
1562 .llseek = seq_lseek,
1563 .write = smk_write_net6addr,
1564 .release = seq_release,
1565};
1566#endif /* CONFIG_IPV6 */
1567
1568/**
1569 * smk_read_doi - read() for /smack/doi
1570 * @filp: file pointer, not actually used
1571 * @buf: where to put the result
1572 * @count: maximum to send along
1573 * @ppos: where to start
1574 *
1575 * Returns number of bytes read or error code, as appropriate
1576 */
1577static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1578 size_t count, loff_t *ppos)
1579{
1580 char temp[80];
1581 ssize_t rc;
1582
1583 if (*ppos != 0)
1584 return 0;
1585
1586 sprintf(temp, "%d", smk_cipso_doi_value);
1587 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1588
1589 return rc;
1590}
1591
1592/**
1593 * smk_write_doi - write() for /smack/doi
1594 * @file: file pointer, not actually used
1595 * @buf: where to get the data from
1596 * @count: bytes sent
1597 * @ppos: where to start
1598 *
1599 * Returns number of bytes written or error code, as appropriate
1600 */
1601static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1602 size_t count, loff_t *ppos)
1603{
1604 char temp[80];
1605 int i;
1606
1607 if (!smack_privileged(CAP_MAC_ADMIN))
1608 return -EPERM;
1609
1610 if (count >= sizeof(temp) || count == 0)
1611 return -EINVAL;
1612
1613 if (copy_from_user(temp, buf, count) != 0)
1614 return -EFAULT;
1615
1616 temp[count] = '\0';
1617
1618 if (sscanf(temp, "%d", &i) != 1)
1619 return -EINVAL;
1620
1621 smk_cipso_doi_value = i;
1622
1623 smk_cipso_doi();
1624
1625 return count;
1626}
1627
1628static const struct file_operations smk_doi_ops = {
1629 .read = smk_read_doi,
1630 .write = smk_write_doi,
1631 .llseek = default_llseek,
1632};
1633
1634/**
1635 * smk_read_direct - read() for /smack/direct
1636 * @filp: file pointer, not actually used
1637 * @buf: where to put the result
1638 * @count: maximum to send along
1639 * @ppos: where to start
1640 *
1641 * Returns number of bytes read or error code, as appropriate
1642 */
1643static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1644 size_t count, loff_t *ppos)
1645{
1646 char temp[80];
1647 ssize_t rc;
1648
1649 if (*ppos != 0)
1650 return 0;
1651
1652 sprintf(temp, "%d", smack_cipso_direct);
1653 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1654
1655 return rc;
1656}
1657
1658/**
1659 * smk_write_direct - write() for /smack/direct
1660 * @file: file pointer, not actually used
1661 * @buf: where to get the data from
1662 * @count: bytes sent
1663 * @ppos: where to start
1664 *
1665 * Returns number of bytes written or error code, as appropriate
1666 */
1667static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1668 size_t count, loff_t *ppos)
1669{
1670 struct smack_known *skp;
1671 char temp[80];
1672 int i;
1673
1674 if (!smack_privileged(CAP_MAC_ADMIN))
1675 return -EPERM;
1676
1677 if (count >= sizeof(temp) || count == 0)
1678 return -EINVAL;
1679
1680 if (copy_from_user(temp, buf, count) != 0)
1681 return -EFAULT;
1682
1683 temp[count] = '\0';
1684
1685 if (sscanf(temp, "%d", &i) != 1)
1686 return -EINVAL;
1687
1688 /*
1689 * Don't do anything if the value hasn't actually changed.
1690 * If it is changing reset the level on entries that were
1691 * set up to be direct when they were created.
1692 */
1693 if (smack_cipso_direct != i) {
1694 mutex_lock(&smack_known_lock);
1695 list_for_each_entry_rcu(skp, &smack_known_list, list)
1696 if (skp->smk_netlabel.attr.mls.lvl ==
1697 smack_cipso_direct)
1698 skp->smk_netlabel.attr.mls.lvl = i;
1699 smack_cipso_direct = i;
1700 mutex_unlock(&smack_known_lock);
1701 }
1702
1703 return count;
1704}
1705
1706static const struct file_operations smk_direct_ops = {
1707 .read = smk_read_direct,
1708 .write = smk_write_direct,
1709 .llseek = default_llseek,
1710};
1711
1712/**
1713 * smk_read_mapped - read() for /smack/mapped
1714 * @filp: file pointer, not actually used
1715 * @buf: where to put the result
1716 * @count: maximum to send along
1717 * @ppos: where to start
1718 *
1719 * Returns number of bytes read or error code, as appropriate
1720 */
1721static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1722 size_t count, loff_t *ppos)
1723{
1724 char temp[80];
1725 ssize_t rc;
1726
1727 if (*ppos != 0)
1728 return 0;
1729
1730 sprintf(temp, "%d", smack_cipso_mapped);
1731 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1732
1733 return rc;
1734}
1735
1736/**
1737 * smk_write_mapped - write() for /smack/mapped
1738 * @file: file pointer, not actually used
1739 * @buf: where to get the data from
1740 * @count: bytes sent
1741 * @ppos: where to start
1742 *
1743 * Returns number of bytes written or error code, as appropriate
1744 */
1745static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1746 size_t count, loff_t *ppos)
1747{
1748 struct smack_known *skp;
1749 char temp[80];
1750 int i;
1751
1752 if (!smack_privileged(CAP_MAC_ADMIN))
1753 return -EPERM;
1754
1755 if (count >= sizeof(temp) || count == 0)
1756 return -EINVAL;
1757
1758 if (copy_from_user(temp, buf, count) != 0)
1759 return -EFAULT;
1760
1761 temp[count] = '\0';
1762
1763 if (sscanf(temp, "%d", &i) != 1)
1764 return -EINVAL;
1765
1766 /*
1767 * Don't do anything if the value hasn't actually changed.
1768 * If it is changing reset the level on entries that were
1769 * set up to be mapped when they were created.
1770 */
1771 if (smack_cipso_mapped != i) {
1772 mutex_lock(&smack_known_lock);
1773 list_for_each_entry_rcu(skp, &smack_known_list, list)
1774 if (skp->smk_netlabel.attr.mls.lvl ==
1775 smack_cipso_mapped)
1776 skp->smk_netlabel.attr.mls.lvl = i;
1777 smack_cipso_mapped = i;
1778 mutex_unlock(&smack_known_lock);
1779 }
1780
1781 return count;
1782}
1783
1784static const struct file_operations smk_mapped_ops = {
1785 .read = smk_read_mapped,
1786 .write = smk_write_mapped,
1787 .llseek = default_llseek,
1788};
1789
1790/**
1791 * smk_read_ambient - read() for /smack/ambient
1792 * @filp: file pointer, not actually used
1793 * @buf: where to put the result
1794 * @cn: maximum to send along
1795 * @ppos: where to start
1796 *
1797 * Returns number of bytes read or error code, as appropriate
1798 */
1799static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1800 size_t cn, loff_t *ppos)
1801{
1802 ssize_t rc;
1803 int asize;
1804
1805 if (*ppos != 0)
1806 return 0;
1807 /*
1808 * Being careful to avoid a problem in the case where
1809 * smack_net_ambient gets changed in midstream.
1810 */
1811 mutex_lock(&smack_ambient_lock);
1812
1813 asize = strlen(smack_net_ambient->smk_known) + 1;
1814
1815 if (cn >= asize)
1816 rc = simple_read_from_buffer(buf, cn, ppos,
1817 smack_net_ambient->smk_known,
1818 asize);
1819 else
1820 rc = -EINVAL;
1821
1822 mutex_unlock(&smack_ambient_lock);
1823
1824 return rc;
1825}
1826
1827/**
1828 * smk_write_ambient - write() for /smack/ambient
1829 * @file: file pointer, not actually used
1830 * @buf: where to get the data from
1831 * @count: bytes sent
1832 * @ppos: where to start
1833 *
1834 * Returns number of bytes written or error code, as appropriate
1835 */
1836static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1837 size_t count, loff_t *ppos)
1838{
1839 struct smack_known *skp;
1840 char *oldambient;
1841 char *data;
1842 int rc = count;
1843
1844 if (!smack_privileged(CAP_MAC_ADMIN))
1845 return -EPERM;
1846
1847 data = memdup_user_nul(buf, count);
1848 if (IS_ERR(data))
1849 return PTR_ERR(data);
1850
1851 skp = smk_import_entry(data, count);
1852 if (IS_ERR(skp)) {
1853 rc = PTR_ERR(skp);
1854 goto out;
1855 }
1856
1857 mutex_lock(&smack_ambient_lock);
1858
1859 oldambient = smack_net_ambient->smk_known;
1860 smack_net_ambient = skp;
1861 smk_unlbl_ambient(oldambient);
1862
1863 mutex_unlock(&smack_ambient_lock);
1864
1865out:
1866 kfree(data);
1867 return rc;
1868}
1869
1870static const struct file_operations smk_ambient_ops = {
1871 .read = smk_read_ambient,
1872 .write = smk_write_ambient,
1873 .llseek = default_llseek,
1874};
1875
1876/*
1877 * Seq_file operations for /smack/onlycap
1878 */
1879static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1880{
1881 return smk_seq_start(s, pos, &smack_onlycap_list);
1882}
1883
1884static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1885{
1886 return smk_seq_next(s, v, pos, &smack_onlycap_list);
1887}
1888
1889static int onlycap_seq_show(struct seq_file *s, void *v)
1890{
1891 struct list_head *list = v;
1892 struct smack_known_list_elem *sklep =
1893 list_entry_rcu(list, struct smack_known_list_elem, list);
1894
1895 seq_puts(s, sklep->smk_label->smk_known);
1896 seq_putc(s, ' ');
1897
1898 return 0;
1899}
1900
1901static const struct seq_operations onlycap_seq_ops = {
1902 .start = onlycap_seq_start,
1903 .next = onlycap_seq_next,
1904 .show = onlycap_seq_show,
1905 .stop = smk_seq_stop,
1906};
1907
1908static int smk_open_onlycap(struct inode *inode, struct file *file)
1909{
1910 return seq_open(file, &onlycap_seq_ops);
1911}
1912
1913/**
1914 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1915 * The caller must hold appropriate mutex to prevent concurrent modifications
1916 * to the public list.
1917 * Private list is assumed to be not accessible to other threads yet.
1918 *
1919 * @public: public list
1920 * @private: private list
1921 */
1922static void smk_list_swap_rcu(struct list_head *public,
1923 struct list_head *private)
1924{
1925 struct list_head *first, *last;
1926
1927 if (list_empty(public)) {
1928 list_splice_init_rcu(private, public, synchronize_rcu);
1929 } else {
1930 /* Remember public list before replacing it */
1931 first = public->next;
1932 last = public->prev;
1933
1934 /* Publish private list in place of public in RCU-safe way */
1935 private->prev->next = public;
1936 private->next->prev = public;
1937 rcu_assign_pointer(public->next, private->next);
1938 public->prev = private->prev;
1939
1940 synchronize_rcu();
1941
1942 /* When all readers are done with the old public list,
1943 * attach it in place of private */
1944 private->next = first;
1945 private->prev = last;
1946 first->prev = private;
1947 last->next = private;
1948 }
1949}
1950
1951/**
1952 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1953 *
1954 * @data: the string to parse
1955 * @private: destination list
1956 *
1957 * Returns zero on success or error code, as appropriate
1958 */
1959static int smk_parse_label_list(char *data, struct list_head *list)
1960{
1961 char *tok;
1962 struct smack_known *skp;
1963 struct smack_known_list_elem *sklep;
1964
1965 while ((tok = strsep(&data, " ")) != NULL) {
1966 if (!*tok)
1967 continue;
1968
1969 skp = smk_import_entry(tok, 0);
1970 if (IS_ERR(skp))
1971 return PTR_ERR(skp);
1972
1973 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1974 if (sklep == NULL)
1975 return -ENOMEM;
1976
1977 sklep->smk_label = skp;
1978 list_add(&sklep->list, list);
1979 }
1980
1981 return 0;
1982}
1983
1984/**
1985 * smk_destroy_label_list - destroy a list of smack_known_list_elem
1986 * @head: header pointer of the list to destroy
1987 */
1988void smk_destroy_label_list(struct list_head *list)
1989{
1990 struct smack_known_list_elem *sklep;
1991 struct smack_known_list_elem *sklep2;
1992
1993 list_for_each_entry_safe(sklep, sklep2, list, list)
1994 kfree(sklep);
1995
1996 INIT_LIST_HEAD(list);
1997}
1998
1999/**
2000 * smk_write_onlycap - write() for smackfs/onlycap
2001 * @file: file pointer, not actually used
2002 * @buf: where to get the data from
2003 * @count: bytes sent
2004 * @ppos: where to start
2005 *
2006 * Returns number of bytes written or error code, as appropriate
2007 */
2008static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
2009 size_t count, loff_t *ppos)
2010{
2011 char *data;
2012 LIST_HEAD(list_tmp);
2013 int rc;
2014
2015 if (!smack_privileged(CAP_MAC_ADMIN))
2016 return -EPERM;
2017
2018 data = memdup_user_nul(buf, count);
2019 if (IS_ERR(data))
2020 return PTR_ERR(data);
2021
2022 rc = smk_parse_label_list(data, &list_tmp);
2023 kfree(data);
2024
2025 /*
2026 * Clear the smack_onlycap on invalid label errors. This means
2027 * that we can pass a null string to unset the onlycap value.
2028 *
2029 * Importing will also reject a label beginning with '-',
2030 * so "-usecapabilities" will also work.
2031 *
2032 * But do so only on invalid label, not on system errors.
2033 * The invalid label must be first to count as clearing attempt.
2034 */
2035 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2036 mutex_lock(&smack_onlycap_lock);
2037 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2038 mutex_unlock(&smack_onlycap_lock);
2039 rc = count;
2040 }
2041
2042 smk_destroy_label_list(&list_tmp);
2043
2044 return rc;
2045}
2046
2047static const struct file_operations smk_onlycap_ops = {
2048 .open = smk_open_onlycap,
2049 .read = seq_read,
2050 .write = smk_write_onlycap,
2051 .llseek = seq_lseek,
2052 .release = seq_release,
2053};
2054
2055#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2056/**
2057 * smk_read_unconfined - read() for smackfs/unconfined
2058 * @filp: file pointer, not actually used
2059 * @buf: where to put the result
2060 * @cn: maximum to send along
2061 * @ppos: where to start
2062 *
2063 * Returns number of bytes read or error code, as appropriate
2064 */
2065static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2066 size_t cn, loff_t *ppos)
2067{
2068 char *smack = "";
2069 ssize_t rc = -EINVAL;
2070 int asize;
2071
2072 if (*ppos != 0)
2073 return 0;
2074
2075 if (smack_unconfined != NULL)
2076 smack = smack_unconfined->smk_known;
2077
2078 asize = strlen(smack) + 1;
2079
2080 if (cn >= asize)
2081 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2082
2083 return rc;
2084}
2085
2086/**
2087 * smk_write_unconfined - write() for smackfs/unconfined
2088 * @file: file pointer, not actually used
2089 * @buf: where to get the data from
2090 * @count: bytes sent
2091 * @ppos: where to start
2092 *
2093 * Returns number of bytes written or error code, as appropriate
2094 */
2095static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2096 size_t count, loff_t *ppos)
2097{
2098 char *data;
2099 struct smack_known *skp;
2100 int rc = count;
2101
2102 if (!smack_privileged(CAP_MAC_ADMIN))
2103 return -EPERM;
2104
2105 data = memdup_user_nul(buf, count);
2106 if (IS_ERR(data))
2107 return PTR_ERR(data);
2108
2109 /*
2110 * Clear the smack_unconfined on invalid label errors. This means
2111 * that we can pass a null string to unset the unconfined value.
2112 *
2113 * Importing will also reject a label beginning with '-',
2114 * so "-confine" will also work.
2115 *
2116 * But do so only on invalid label, not on system errors.
2117 */
2118 skp = smk_import_entry(data, count);
2119 if (PTR_ERR(skp) == -EINVAL)
2120 skp = NULL;
2121 else if (IS_ERR(skp)) {
2122 rc = PTR_ERR(skp);
2123 goto freeout;
2124 }
2125
2126 smack_unconfined = skp;
2127
2128freeout:
2129 kfree(data);
2130 return rc;
2131}
2132
2133static const struct file_operations smk_unconfined_ops = {
2134 .read = smk_read_unconfined,
2135 .write = smk_write_unconfined,
2136 .llseek = default_llseek,
2137};
2138#endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2139
2140/**
2141 * smk_read_logging - read() for /smack/logging
2142 * @filp: file pointer, not actually used
2143 * @buf: where to put the result
2144 * @cn: maximum to send along
2145 * @ppos: where to start
2146 *
2147 * Returns number of bytes read or error code, as appropriate
2148 */
2149static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2150 size_t count, loff_t *ppos)
2151{
2152 char temp[32];
2153 ssize_t rc;
2154
2155 if (*ppos != 0)
2156 return 0;
2157
2158 sprintf(temp, "%d\n", log_policy);
2159 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2160 return rc;
2161}
2162
2163/**
2164 * smk_write_logging - write() for /smack/logging
2165 * @file: file pointer, not actually used
2166 * @buf: where to get the data from
2167 * @count: bytes sent
2168 * @ppos: where to start
2169 *
2170 * Returns number of bytes written or error code, as appropriate
2171 */
2172static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2173 size_t count, loff_t *ppos)
2174{
2175 char temp[32];
2176 int i;
2177
2178 if (!smack_privileged(CAP_MAC_ADMIN))
2179 return -EPERM;
2180
2181 if (count >= sizeof(temp) || count == 0)
2182 return -EINVAL;
2183
2184 if (copy_from_user(temp, buf, count) != 0)
2185 return -EFAULT;
2186
2187 temp[count] = '\0';
2188
2189 if (sscanf(temp, "%d", &i) != 1)
2190 return -EINVAL;
2191 if (i < 0 || i > 3)
2192 return -EINVAL;
2193 log_policy = i;
2194 return count;
2195}
2196
2197
2198
2199static const struct file_operations smk_logging_ops = {
2200 .read = smk_read_logging,
2201 .write = smk_write_logging,
2202 .llseek = default_llseek,
2203};
2204
2205/*
2206 * Seq_file read operations for /smack/load-self
2207 */
2208
2209static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2210{
2211 struct task_smack *tsp = current_security();
2212
2213 return smk_seq_start(s, pos, &tsp->smk_rules);
2214}
2215
2216static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2217{
2218 struct task_smack *tsp = current_security();
2219
2220 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2221}
2222
2223static int load_self_seq_show(struct seq_file *s, void *v)
2224{
2225 struct list_head *list = v;
2226 struct smack_rule *srp =
2227 list_entry_rcu(list, struct smack_rule, list);
2228
2229 smk_rule_show(s, srp, SMK_LABELLEN);
2230
2231 return 0;
2232}
2233
2234static const struct seq_operations load_self_seq_ops = {
2235 .start = load_self_seq_start,
2236 .next = load_self_seq_next,
2237 .show = load_self_seq_show,
2238 .stop = smk_seq_stop,
2239};
2240
2241
2242/**
2243 * smk_open_load_self - open() for /smack/load-self2
2244 * @inode: inode structure representing file
2245 * @file: "load" file pointer
2246 *
2247 * For reading, use load_seq_* seq_file reading operations.
2248 */
2249static int smk_open_load_self(struct inode *inode, struct file *file)
2250{
2251 return seq_open(file, &load_self_seq_ops);
2252}
2253
2254/**
2255 * smk_write_load_self - write() for /smack/load-self
2256 * @file: file pointer, not actually used
2257 * @buf: where to get the data from
2258 * @count: bytes sent
2259 * @ppos: where to start - must be 0
2260 *
2261 */
2262static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2263 size_t count, loff_t *ppos)
2264{
2265 struct task_smack *tsp = current_security();
2266
2267 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2268 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2269}
2270
2271static const struct file_operations smk_load_self_ops = {
2272 .open = smk_open_load_self,
2273 .read = seq_read,
2274 .llseek = seq_lseek,
2275 .write = smk_write_load_self,
2276 .release = seq_release,
2277};
2278
2279/**
2280 * smk_user_access - handle access check transaction
2281 * @file: file pointer
2282 * @buf: data from user space
2283 * @count: bytes sent
2284 * @ppos: where to start - must be 0
2285 */
2286static ssize_t smk_user_access(struct file *file, const char __user *buf,
2287 size_t count, loff_t *ppos, int format)
2288{
2289 struct smack_parsed_rule rule;
2290 char *data;
2291 int res;
2292
2293 data = simple_transaction_get(file, buf, count);
2294 if (IS_ERR(data))
2295 return PTR_ERR(data);
2296
2297 if (format == SMK_FIXED24_FMT) {
2298 if (count < SMK_LOADLEN)
2299 return -EINVAL;
2300 res = smk_parse_rule(data, &rule, 0);
2301 } else {
2302 /*
2303 * simple_transaction_get() returns null-terminated data
2304 */
2305 res = smk_parse_long_rule(data, &rule, 0, 3);
2306 }
2307
2308 if (res >= 0)
2309 res = smk_access(rule.smk_subject, rule.smk_object,
2310 rule.smk_access1, NULL);
2311 else if (res != -ENOENT)
2312 return res;
2313
2314 /*
2315 * smk_access() can return a value > 0 in the "bringup" case.
2316 */
2317 data[0] = res >= 0 ? '1' : '0';
2318 data[1] = '\0';
2319
2320 simple_transaction_set(file, 2);
2321
2322 if (format == SMK_FIXED24_FMT)
2323 return SMK_LOADLEN;
2324 return count;
2325}
2326
2327/**
2328 * smk_write_access - handle access check transaction
2329 * @file: file pointer
2330 * @buf: data from user space
2331 * @count: bytes sent
2332 * @ppos: where to start - must be 0
2333 */
2334static ssize_t smk_write_access(struct file *file, const char __user *buf,
2335 size_t count, loff_t *ppos)
2336{
2337 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2338}
2339
2340static const struct file_operations smk_access_ops = {
2341 .write = smk_write_access,
2342 .read = simple_transaction_read,
2343 .release = simple_transaction_release,
2344 .llseek = generic_file_llseek,
2345};
2346
2347
2348/*
2349 * Seq_file read operations for /smack/load2
2350 */
2351
2352static int load2_seq_show(struct seq_file *s, void *v)
2353{
2354 struct list_head *list = v;
2355 struct smack_master_list *smlp =
2356 list_entry_rcu(list, struct smack_master_list, list);
2357
2358 smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);
2359
2360 return 0;
2361}
2362
2363static const struct seq_operations load2_seq_ops = {
2364 .start = load2_seq_start,
2365 .next = load2_seq_next,
2366 .show = load2_seq_show,
2367 .stop = smk_seq_stop,
2368};
2369
2370/**
2371 * smk_open_load2 - open() for /smack/load2
2372 * @inode: inode structure representing file
2373 * @file: "load2" file pointer
2374 *
2375 * For reading, use load2_seq_* seq_file reading operations.
2376 */
2377static int smk_open_load2(struct inode *inode, struct file *file)
2378{
2379 return seq_open(file, &load2_seq_ops);
2380}
2381
2382/**
2383 * smk_write_load2 - write() for /smack/load2
2384 * @file: file pointer, not actually used
2385 * @buf: where to get the data from
2386 * @count: bytes sent
2387 * @ppos: where to start - must be 0
2388 *
2389 */
2390static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2391 size_t count, loff_t *ppos)
2392{
2393 /*
2394 * Must have privilege.
2395 */
2396 if (!smack_privileged(CAP_MAC_ADMIN))
2397 return -EPERM;
2398
2399 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2400 SMK_LONG_FMT);
2401}
2402
2403static const struct file_operations smk_load2_ops = {
2404 .open = smk_open_load2,
2405 .read = seq_read,
2406 .llseek = seq_lseek,
2407 .write = smk_write_load2,
2408 .release = seq_release,
2409};
2410
2411/*
2412 * Seq_file read operations for /smack/load-self2
2413 */
2414
2415static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2416{
2417 struct task_smack *tsp = current_security();
2418
2419 return smk_seq_start(s, pos, &tsp->smk_rules);
2420}
2421
2422static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2423{
2424 struct task_smack *tsp = current_security();
2425
2426 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2427}
2428
2429static int load_self2_seq_show(struct seq_file *s, void *v)
2430{
2431 struct list_head *list = v;
2432 struct smack_rule *srp =
2433 list_entry_rcu(list, struct smack_rule, list);
2434
2435 smk_rule_show(s, srp, SMK_LONGLABEL);
2436
2437 return 0;
2438}
2439
2440static const struct seq_operations load_self2_seq_ops = {
2441 .start = load_self2_seq_start,
2442 .next = load_self2_seq_next,
2443 .show = load_self2_seq_show,
2444 .stop = smk_seq_stop,
2445};
2446
2447/**
2448 * smk_open_load_self2 - open() for /smack/load-self2
2449 * @inode: inode structure representing file
2450 * @file: "load" file pointer
2451 *
2452 * For reading, use load_seq_* seq_file reading operations.
2453 */
2454static int smk_open_load_self2(struct inode *inode, struct file *file)
2455{
2456 return seq_open(file, &load_self2_seq_ops);
2457}
2458
2459/**
2460 * smk_write_load_self2 - write() for /smack/load-self2
2461 * @file: file pointer, not actually used
2462 * @buf: where to get the data from
2463 * @count: bytes sent
2464 * @ppos: where to start - must be 0
2465 *
2466 */
2467static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2468 size_t count, loff_t *ppos)
2469{
2470 struct task_smack *tsp = current_security();
2471
2472 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2473 &tsp->smk_rules_lock, SMK_LONG_FMT);
2474}
2475
2476static const struct file_operations smk_load_self2_ops = {
2477 .open = smk_open_load_self2,
2478 .read = seq_read,
2479 .llseek = seq_lseek,
2480 .write = smk_write_load_self2,
2481 .release = seq_release,
2482};
2483
2484/**
2485 * smk_write_access2 - handle access check transaction
2486 * @file: file pointer
2487 * @buf: data from user space
2488 * @count: bytes sent
2489 * @ppos: where to start - must be 0
2490 */
2491static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2492 size_t count, loff_t *ppos)
2493{
2494 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2495}
2496
2497static const struct file_operations smk_access2_ops = {
2498 .write = smk_write_access2,
2499 .read = simple_transaction_read,
2500 .release = simple_transaction_release,
2501 .llseek = generic_file_llseek,
2502};
2503
2504/**
2505 * smk_write_revoke_subj - write() for /smack/revoke-subject
2506 * @file: file pointer
2507 * @buf: data from user space
2508 * @count: bytes sent
2509 * @ppos: where to start - must be 0
2510 */
2511static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2512 size_t count, loff_t *ppos)
2513{
2514 char *data;
2515 const char *cp;
2516 struct smack_known *skp;
2517 struct smack_rule *sp;
2518 struct list_head *rule_list;
2519 struct mutex *rule_lock;
2520 int rc = count;
2521
2522 if (*ppos != 0)
2523 return -EINVAL;
2524
2525 if (!smack_privileged(CAP_MAC_ADMIN))
2526 return -EPERM;
2527
2528 if (count == 0 || count > SMK_LONGLABEL)
2529 return -EINVAL;
2530
2531 data = memdup_user(buf, count);
2532 if (IS_ERR(data))
2533 return PTR_ERR(data);
2534
2535 cp = smk_parse_smack(data, count);
2536 if (IS_ERR(cp)) {
2537 rc = PTR_ERR(cp);
2538 goto out_data;
2539 }
2540
2541 skp = smk_find_entry(cp);
2542 if (skp == NULL)
2543 goto out_cp;
2544
2545 rule_list = &skp->smk_rules;
2546 rule_lock = &skp->smk_rules_lock;
2547
2548 mutex_lock(rule_lock);
2549
2550 list_for_each_entry_rcu(sp, rule_list, list)
2551 sp->smk_access = 0;
2552
2553 mutex_unlock(rule_lock);
2554
2555out_cp:
2556 kfree(cp);
2557out_data:
2558 kfree(data);
2559
2560 return rc;
2561}
2562
2563static const struct file_operations smk_revoke_subj_ops = {
2564 .write = smk_write_revoke_subj,
2565 .read = simple_transaction_read,
2566 .release = simple_transaction_release,
2567 .llseek = generic_file_llseek,
2568};
2569
2570/**
2571 * smk_init_sysfs - initialize /sys/fs/smackfs
2572 *
2573 */
2574static int smk_init_sysfs(void)
2575{
2576 return sysfs_create_mount_point(fs_kobj, "smackfs");
2577}
2578
2579/**
2580 * smk_write_change_rule - write() for /smack/change-rule
2581 * @file: file pointer
2582 * @buf: data from user space
2583 * @count: bytes sent
2584 * @ppos: where to start - must be 0
2585 */
2586static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2587 size_t count, loff_t *ppos)
2588{
2589 /*
2590 * Must have privilege.
2591 */
2592 if (!smack_privileged(CAP_MAC_ADMIN))
2593 return -EPERM;
2594
2595 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2596 SMK_CHANGE_FMT);
2597}
2598
2599static const struct file_operations smk_change_rule_ops = {
2600 .write = smk_write_change_rule,
2601 .read = simple_transaction_read,
2602 .release = simple_transaction_release,
2603 .llseek = generic_file_llseek,
2604};
2605
2606/**
2607 * smk_read_syslog - read() for smackfs/syslog
2608 * @filp: file pointer, not actually used
2609 * @buf: where to put the result
2610 * @cn: maximum to send along
2611 * @ppos: where to start
2612 *
2613 * Returns number of bytes read or error code, as appropriate
2614 */
2615static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2616 size_t cn, loff_t *ppos)
2617{
2618 struct smack_known *skp;
2619 ssize_t rc = -EINVAL;
2620 int asize;
2621
2622 if (*ppos != 0)
2623 return 0;
2624
2625 if (smack_syslog_label == NULL)
2626 skp = &smack_known_star;
2627 else
2628 skp = smack_syslog_label;
2629
2630 asize = strlen(skp->smk_known) + 1;
2631
2632 if (cn >= asize)
2633 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2634 asize);
2635
2636 return rc;
2637}
2638
2639/**
2640 * smk_write_syslog - write() for smackfs/syslog
2641 * @file: file pointer, not actually used
2642 * @buf: where to get the data from
2643 * @count: bytes sent
2644 * @ppos: where to start
2645 *
2646 * Returns number of bytes written or error code, as appropriate
2647 */
2648static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2649 size_t count, loff_t *ppos)
2650{
2651 char *data;
2652 struct smack_known *skp;
2653 int rc = count;
2654
2655 if (!smack_privileged(CAP_MAC_ADMIN))
2656 return -EPERM;
2657
2658 data = memdup_user_nul(buf, count);
2659 if (IS_ERR(data))
2660 return PTR_ERR(data);
2661
2662 skp = smk_import_entry(data, count);
2663 if (IS_ERR(skp))
2664 rc = PTR_ERR(skp);
2665 else
2666 smack_syslog_label = skp;
2667
2668 kfree(data);
2669 return rc;
2670}
2671
2672static const struct file_operations smk_syslog_ops = {
2673 .read = smk_read_syslog,
2674 .write = smk_write_syslog,
2675 .llseek = default_llseek,
2676};
2677
2678/*
2679 * Seq_file read operations for /smack/relabel-self
2680 */
2681
2682static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2683{
2684 struct task_smack *tsp = current_security();
2685
2686 return smk_seq_start(s, pos, &tsp->smk_relabel);
2687}
2688
2689static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2690{
2691 struct task_smack *tsp = current_security();
2692
2693 return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2694}
2695
2696static int relabel_self_seq_show(struct seq_file *s, void *v)
2697{
2698 struct list_head *list = v;
2699 struct smack_known_list_elem *sklep =
2700 list_entry(list, struct smack_known_list_elem, list);
2701
2702 seq_puts(s, sklep->smk_label->smk_known);
2703 seq_putc(s, ' ');
2704
2705 return 0;
2706}
2707
2708static const struct seq_operations relabel_self_seq_ops = {
2709 .start = relabel_self_seq_start,
2710 .next = relabel_self_seq_next,
2711 .show = relabel_self_seq_show,
2712 .stop = smk_seq_stop,
2713};
2714
2715/**
2716 * smk_open_relabel_self - open() for /smack/relabel-self
2717 * @inode: inode structure representing file
2718 * @file: "relabel-self" file pointer
2719 *
2720 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2721 * file_operations
2722 */
2723static int smk_open_relabel_self(struct inode *inode, struct file *file)
2724{
2725 return seq_open(file, &relabel_self_seq_ops);
2726}
2727
2728/**
2729 * smk_write_relabel_self - write() for /smack/relabel-self
2730 * @file: file pointer, not actually used
2731 * @buf: where to get the data from
2732 * @count: bytes sent
2733 * @ppos: where to start - must be 0
2734 *
2735 */
2736static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2737 size_t count, loff_t *ppos)
2738{
2739 struct task_smack *tsp = current_security();
2740 char *data;
2741 int rc;
2742 LIST_HEAD(list_tmp);
2743
2744 /*
2745 * Must have privilege.
2746 */
2747 if (!smack_privileged(CAP_MAC_ADMIN))
2748 return -EPERM;
2749
2750 /*
2751 * Enough data must be present.
2752 */
2753 if (*ppos != 0)
2754 return -EINVAL;
2755
2756 data = memdup_user_nul(buf, count);
2757 if (IS_ERR(data))
2758 return PTR_ERR(data);
2759
2760 rc = smk_parse_label_list(data, &list_tmp);
2761 kfree(data);
2762
2763 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2764 smk_destroy_label_list(&tsp->smk_relabel);
2765 list_splice(&list_tmp, &tsp->smk_relabel);
2766 return count;
2767 }
2768
2769 smk_destroy_label_list(&list_tmp);
2770 return rc;
2771}
2772
2773static const struct file_operations smk_relabel_self_ops = {
2774 .open = smk_open_relabel_self,
2775 .read = seq_read,
2776 .llseek = seq_lseek,
2777 .write = smk_write_relabel_self,
2778 .release = seq_release,
2779};
2780
2781/**
2782 * smk_read_ptrace - read() for /smack/ptrace
2783 * @filp: file pointer, not actually used
2784 * @buf: where to put the result
2785 * @count: maximum to send along
2786 * @ppos: where to start
2787 *
2788 * Returns number of bytes read or error code, as appropriate
2789 */
2790static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2791 size_t count, loff_t *ppos)
2792{
2793 char temp[32];
2794 ssize_t rc;
2795
2796 if (*ppos != 0)
2797 return 0;
2798
2799 sprintf(temp, "%d\n", smack_ptrace_rule);
2800 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2801 return rc;
2802}
2803
2804/**
2805 * smk_write_ptrace - write() for /smack/ptrace
2806 * @file: file pointer
2807 * @buf: data from user space
2808 * @count: bytes sent
2809 * @ppos: where to start - must be 0
2810 */
2811static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2812 size_t count, loff_t *ppos)
2813{
2814 char temp[32];
2815 int i;
2816
2817 if (!smack_privileged(CAP_MAC_ADMIN))
2818 return -EPERM;
2819
2820 if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2821 return -EINVAL;
2822
2823 if (copy_from_user(temp, buf, count) != 0)
2824 return -EFAULT;
2825
2826 temp[count] = '\0';
2827
2828 if (sscanf(temp, "%d", &i) != 1)
2829 return -EINVAL;
2830 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2831 return -EINVAL;
2832 smack_ptrace_rule = i;
2833
2834 return count;
2835}
2836
2837static const struct file_operations smk_ptrace_ops = {
2838 .write = smk_write_ptrace,
2839 .read = smk_read_ptrace,
2840 .llseek = default_llseek,
2841};
2842
2843/**
2844 * smk_fill_super - fill the smackfs superblock
2845 * @sb: the empty superblock
2846 * @data: unused
2847 * @silent: unused
2848 *
2849 * Fill in the well known entries for the smack filesystem
2850 *
2851 * Returns 0 on success, an error code on failure
2852 */
2853static int smk_fill_super(struct super_block *sb, void *data, int silent)
2854{
2855 int rc;
2856 struct inode *root_inode;
2857
2858 static const struct tree_descr smack_files[] = {
2859 [SMK_LOAD] = {
2860 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2861 [SMK_CIPSO] = {
2862 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2863 [SMK_DOI] = {
2864 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2865 [SMK_DIRECT] = {
2866 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2867 [SMK_AMBIENT] = {
2868 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2869 [SMK_NET4ADDR] = {
2870 "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2871 [SMK_ONLYCAP] = {
2872 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2873 [SMK_LOGGING] = {
2874 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2875 [SMK_LOAD_SELF] = {
2876 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2877 [SMK_ACCESSES] = {
2878 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2879 [SMK_MAPPED] = {
2880 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2881 [SMK_LOAD2] = {
2882 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2883 [SMK_LOAD_SELF2] = {
2884 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2885 [SMK_ACCESS2] = {
2886 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2887 [SMK_CIPSO2] = {
2888 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2889 [SMK_REVOKE_SUBJ] = {
2890 "revoke-subject", &smk_revoke_subj_ops,
2891 S_IRUGO|S_IWUSR},
2892 [SMK_CHANGE_RULE] = {
2893 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2894 [SMK_SYSLOG] = {
2895 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2896 [SMK_PTRACE] = {
2897 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2898#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2899 [SMK_UNCONFINED] = {
2900 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2901#endif
2902#if IS_ENABLED(CONFIG_IPV6)
2903 [SMK_NET6ADDR] = {
2904 "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2905#endif /* CONFIG_IPV6 */
2906 [SMK_RELABEL_SELF] = {
2907 "relabel-self", &smk_relabel_self_ops,
2908 S_IRUGO|S_IWUGO},
2909 /* last one */
2910 {""}
2911 };
2912
2913 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2914 if (rc != 0) {
2915 printk(KERN_ERR "%s failed %d while creating inodes\n",
2916 __func__, rc);
2917 return rc;
2918 }
2919
2920 root_inode = d_inode(sb->s_root);
2921
2922 return 0;
2923}
2924
2925/**
2926 * smk_mount - get the smackfs superblock
2927 * @fs_type: passed along without comment
2928 * @flags: passed along without comment
2929 * @dev_name: passed along without comment
2930 * @data: passed along without comment
2931 *
2932 * Just passes everything along.
2933 *
2934 * Returns what the lower level code does.
2935 */
2936static struct dentry *smk_mount(struct file_system_type *fs_type,
2937 int flags, const char *dev_name, void *data)
2938{
2939 return mount_single(fs_type, flags, data, smk_fill_super);
2940}
2941
2942static struct file_system_type smk_fs_type = {
2943 .name = "smackfs",
2944 .mount = smk_mount,
2945 .kill_sb = kill_litter_super,
2946};
2947
2948static struct vfsmount *smackfs_mount;
2949
2950static int __init smk_preset_netlabel(struct smack_known *skp)
2951{
2952 skp->smk_netlabel.domain = skp->smk_known;
2953 skp->smk_netlabel.flags =
2954 NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2955 return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2956 &skp->smk_netlabel, strlen(skp->smk_known));
2957}
2958
2959/**
2960 * init_smk_fs - get the smackfs superblock
2961 *
2962 * register the smackfs
2963 *
2964 * Do not register smackfs if Smack wasn't enabled
2965 * on boot. We can not put this method normally under the
2966 * smack_init() code path since the security subsystem get
2967 * initialized before the vfs caches.
2968 *
2969 * Returns true if we were not chosen on boot or if
2970 * we were chosen and filesystem registration succeeded.
2971 */
2972static int __init init_smk_fs(void)
2973{
2974 int err;
2975 int rc;
2976
2977 if (smack_enabled == 0)
2978 return 0;
2979
2980 err = smk_init_sysfs();
2981 if (err)
2982 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
2983
2984 err = register_filesystem(&smk_fs_type);
2985 if (!err) {
2986 smackfs_mount = kern_mount(&smk_fs_type);
2987 if (IS_ERR(smackfs_mount)) {
2988 printk(KERN_ERR "smackfs: could not mount!\n");
2989 err = PTR_ERR(smackfs_mount);
2990 smackfs_mount = NULL;
2991 }
2992 }
2993
2994 smk_cipso_doi();
2995 smk_unlbl_ambient(NULL);
2996
2997 rc = smk_preset_netlabel(&smack_known_floor);
2998 if (err == 0 && rc < 0)
2999 err = rc;
3000 rc = smk_preset_netlabel(&smack_known_hat);
3001 if (err == 0 && rc < 0)
3002 err = rc;
3003 rc = smk_preset_netlabel(&smack_known_huh);
3004 if (err == 0 && rc < 0)
3005 err = rc;
3006 rc = smk_preset_netlabel(&smack_known_star);
3007 if (err == 0 && rc < 0)
3008 err = rc;
3009 rc = smk_preset_netlabel(&smack_known_web);
3010 if (err == 0 && rc < 0)
3011 err = rc;
3012
3013 return err;
3014}
3015
3016__initcall(init_smk_fs);
1/*
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);