1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
4 *
5 * Authors:
6 * Casey Schaufler <casey@schaufler-ca.com>
7 * Ahmed S. Darwish <darwish.07@gmail.com>
8 *
9 * Special thanks to the authors of selinuxfs.
10 *
11 * Karl MacMillan <kmacmillan@tresys.com>
12 * James Morris <jmorris@redhat.com>
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/vmalloc.h>
17 #include <linux/security.h>
18 #include <linux/mutex.h>
19 #include <linux/slab.h>
20 #include <net/net_namespace.h>
21 #include <net/cipso_ipv4.h>
22 #include <linux/seq_file.h>
23 #include <linux/ctype.h>
24 #include <linux/audit.h>
25 #include <linux/magic.h>
26 #include <linux/fs_context.h>
27 #include "smack.h"
28
29 #define BEBITS (sizeof(__be32) * 8)
30 /*
31 * smackfs pseudo filesystem.
32 */
33
34 enum smk_inos {
35 SMK_ROOT_INO = 2,
36 SMK_LOAD = 3, /* load policy */
37 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
38 SMK_DOI = 5, /* CIPSO DOI */
39 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
40 SMK_AMBIENT = 7, /* internet ambient label */
41 SMK_NET4ADDR = 8, /* single label hosts */
42 SMK_ONLYCAP = 9, /* the only "capable" label */
43 SMK_LOGGING = 10, /* logging */
44 SMK_LOAD_SELF = 11, /* task specific rules */
45 SMK_ACCESSES = 12, /* access policy */
46 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
47 SMK_LOAD2 = 14, /* load policy with long labels */
48 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
49 SMK_ACCESS2 = 16, /* make an access check with long labels */
50 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
51 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
52 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
53 SMK_SYSLOG = 20, /* change syslog label) */
54 SMK_PTRACE = 21, /* set ptrace rule */
55 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
56 SMK_UNCONFINED = 22, /* define an unconfined label */
57 #endif
58 #if IS_ENABLED(CONFIG_IPV6)
59 SMK_NET6ADDR = 23, /* single label IPv6 hosts */
60 #endif /* CONFIG_IPV6 */
61 SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
62 };
63
64 /*
65 * List locks
66 */
67 static DEFINE_MUTEX(smack_cipso_lock);
68 static DEFINE_MUTEX(smack_ambient_lock);
69 static DEFINE_MUTEX(smk_net4addr_lock);
70 #if IS_ENABLED(CONFIG_IPV6)
71 static DEFINE_MUTEX(smk_net6addr_lock);
72 #endif /* CONFIG_IPV6 */
73
74 /*
75 * This is the "ambient" label for network traffic.
76 * If it isn't somehow marked, use this.
77 * It can be reset via smackfs/ambient
78 */
79 struct smack_known *smack_net_ambient;
80
81 /*
82 * This is the level in a CIPSO header that indicates a
83 * smack label is contained directly in the category set.
84 * It can be reset via smackfs/direct
85 */
86 int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
87
88 /*
89 * This is the level in a CIPSO header that indicates a
90 * secid is contained directly in the category set.
91 * It can be reset via smackfs/mapped
92 */
93 int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
94
95 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
96 /*
97 * Allow one label to be unconfined. This is for
98 * debugging and application bring-up purposes only.
99 * It is bad and wrong, but everyone seems to expect
100 * to have it.
101 */
102 struct smack_known *smack_unconfined;
103 #endif
104
105 /*
106 * If this value is set restrict syslog use to the label specified.
107 * It can be reset via smackfs/syslog
108 */
109 struct smack_known *smack_syslog_label;
110
111 /*
112 * Ptrace current rule
113 * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
114 * SMACK_PTRACE_EXACT labels must match, but can be overriden with
115 * CAP_SYS_PTRACE
116 * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect
117 */
118 int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
119
120 /*
121 * Certain IP addresses may be designated as single label hosts.
122 * Packets are sent there unlabeled, but only from tasks that
123 * can write to the specified label.
124 */
125
126 LIST_HEAD(smk_net4addr_list);
127 #if IS_ENABLED(CONFIG_IPV6)
128 LIST_HEAD(smk_net6addr_list);
129 #endif /* CONFIG_IPV6 */
130
131 /*
132 * Rule lists are maintained for each label.
133 */
134 struct smack_parsed_rule {
135 struct smack_known *smk_subject;
136 struct smack_known *smk_object;
137 int smk_access1;
138 int smk_access2;
139 };
140
141 static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
142
143 /*
144 * Values for parsing cipso rules
145 * SMK_DIGITLEN: Length of a digit field in a rule.
146 * SMK_CIPSOMIN: Minimum possible cipso rule length.
147 * SMK_CIPSOMAX: Maximum possible cipso rule length.
148 */
149 #define SMK_DIGITLEN 4
150 #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
151 #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
152
153 /*
154 * Values for parsing MAC rules
155 * SMK_ACCESS: Maximum possible combination of access permissions
156 * SMK_ACCESSLEN: Maximum length for a rule access field
157 * SMK_LOADLEN: Smack rule length
158 */
159 #define SMK_OACCESS "rwxa"
160 #define SMK_ACCESS "rwxatl"
161 #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
162 #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
163 #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
164 #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
165
166 /*
167 * Stricly for CIPSO level manipulation.
168 * Set the category bit number in a smack label sized buffer.
169 */
smack_catset_bit(unsigned int cat,char * catsetp)170 static inline void smack_catset_bit(unsigned int cat, char *catsetp)
171 {
172 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
173 return;
174
175 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
176 }
177
178 /**
179 * smk_netlabel_audit_set - fill a netlbl_audit struct
180 * @nap: structure to fill
181 */
smk_netlabel_audit_set(struct netlbl_audit * nap)182 static void smk_netlabel_audit_set(struct netlbl_audit *nap)
183 {
184 struct smack_known *skp = smk_of_current();
185
186 nap->loginuid = audit_get_loginuid(current);
187 nap->sessionid = audit_get_sessionid(current);
188 nap->secid = skp->smk_secid;
189 }
190
191 /*
192 * Value for parsing single label host rules
193 * "1.2.3.4 X"
194 */
195 #define SMK_NETLBLADDRMIN 9
196
197 /**
198 * smk_set_access - add a rule to the rule list or replace an old rule
199 * @srp: the rule to add or replace
200 * @rule_list: the list of rules
201 * @rule_lock: the rule list lock
202 *
203 * Looks through the current subject/object/access list for
204 * the subject/object pair and replaces the access that was
205 * there. If the pair isn't found add it with the specified
206 * access.
207 *
208 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
209 * during the allocation of the new pair to add.
210 */
smk_set_access(struct smack_parsed_rule * srp,struct list_head * rule_list,struct mutex * rule_lock)211 static int smk_set_access(struct smack_parsed_rule *srp,
212 struct list_head *rule_list,
213 struct mutex *rule_lock)
214 {
215 struct smack_rule *sp;
216 int found = 0;
217 int rc = 0;
218
219 mutex_lock(rule_lock);
220
221 /*
222 * Because the object label is less likely to match
223 * than the subject label check it first
224 */
225 list_for_each_entry_rcu(sp, rule_list, list) {
226 if (sp->smk_object == srp->smk_object &&
227 sp->smk_subject == srp->smk_subject) {
228 found = 1;
229 sp->smk_access |= srp->smk_access1;
230 sp->smk_access &= ~srp->smk_access2;
231 break;
232 }
233 }
234
235 if (found == 0) {
236 sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL);
237 if (sp == NULL) {
238 rc = -ENOMEM;
239 goto out;
240 }
241
242 sp->smk_subject = srp->smk_subject;
243 sp->smk_object = srp->smk_object;
244 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
245
246 list_add_rcu(&sp->list, rule_list);
247 }
248
249 out:
250 mutex_unlock(rule_lock);
251 return rc;
252 }
253
254 /**
255 * smk_perm_from_str - parse smack accesses from a text string
256 * @string: a text string that contains a Smack accesses code
257 *
258 * Returns an integer with respective bits set for specified accesses.
259 */
smk_perm_from_str(const char * string)260 static int smk_perm_from_str(const char *string)
261 {
262 int perm = 0;
263 const char *cp;
264
265 for (cp = string; ; cp++)
266 switch (*cp) {
267 case '-':
268 break;
269 case 'r':
270 case 'R':
271 perm |= MAY_READ;
272 break;
273 case 'w':
274 case 'W':
275 perm |= MAY_WRITE;
276 break;
277 case 'x':
278 case 'X':
279 perm |= MAY_EXEC;
280 break;
281 case 'a':
282 case 'A':
283 perm |= MAY_APPEND;
284 break;
285 case 't':
286 case 'T':
287 perm |= MAY_TRANSMUTE;
288 break;
289 case 'l':
290 case 'L':
291 perm |= MAY_LOCK;
292 break;
293 case 'b':
294 case 'B':
295 perm |= MAY_BRINGUP;
296 break;
297 default:
298 return perm;
299 }
300 }
301
302 /**
303 * smk_fill_rule - Fill Smack rule from strings
304 * @subject: subject label string
305 * @object: object label string
306 * @access1: access string
307 * @access2: string with permissions to be removed
308 * @rule: Smack rule
309 * @import: if non-zero, import labels
310 * @len: label length limit
311 *
312 * Returns 0 on success, appropriate error code on failure.
313 */
smk_fill_rule(const char * subject,const char * object,const char * access1,const char * access2,struct smack_parsed_rule * rule,int import,int len)314 static int smk_fill_rule(const char *subject, const char *object,
315 const char *access1, const char *access2,
316 struct smack_parsed_rule *rule, int import,
317 int len)
318 {
319 const char *cp;
320 struct smack_known *skp;
321
322 if (import) {
323 rule->smk_subject = smk_import_entry(subject, len);
324 if (IS_ERR(rule->smk_subject))
325 return PTR_ERR(rule->smk_subject);
326
327 rule->smk_object = smk_import_entry(object, len);
328 if (IS_ERR(rule->smk_object))
329 return PTR_ERR(rule->smk_object);
330 } else {
331 cp = smk_parse_smack(subject, len);
332 if (IS_ERR(cp))
333 return PTR_ERR(cp);
334 skp = smk_find_entry(cp);
335 kfree(cp);
336 if (skp == NULL)
337 return -ENOENT;
338 rule->smk_subject = skp;
339
340 cp = smk_parse_smack(object, len);
341 if (IS_ERR(cp))
342 return PTR_ERR(cp);
343 skp = smk_find_entry(cp);
344 kfree(cp);
345 if (skp == NULL)
346 return -ENOENT;
347 rule->smk_object = skp;
348 }
349
350 rule->smk_access1 = smk_perm_from_str(access1);
351 if (access2)
352 rule->smk_access2 = smk_perm_from_str(access2);
353 else
354 rule->smk_access2 = ~rule->smk_access1;
355
356 return 0;
357 }
358
359 /**
360 * smk_parse_rule - parse Smack rule from load string
361 * @data: string to be parsed whose size is SMK_LOADLEN
362 * @rule: Smack rule
363 * @import: if non-zero, import labels
364 *
365 * Returns 0 on success, -1 on errors.
366 */
smk_parse_rule(const char * data,struct smack_parsed_rule * rule,int import)367 static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
368 int import)
369 {
370 int rc;
371
372 rc = smk_fill_rule(data, data + SMK_LABELLEN,
373 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
374 import, SMK_LABELLEN);
375 return rc;
376 }
377
378 /**
379 * smk_parse_long_rule - parse Smack rule from rule string
380 * @data: string to be parsed, null terminated
381 * @rule: Will be filled with Smack parsed rule
382 * @import: if non-zero, import labels
383 * @tokens: numer of substrings expected in data
384 *
385 * Returns number of processed bytes on success, -ERRNO on failure.
386 */
smk_parse_long_rule(char * data,struct smack_parsed_rule * rule,int import,int tokens)387 static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
388 int import, int tokens)
389 {
390 ssize_t cnt = 0;
391 char *tok[4];
392 int rc;
393 int i;
394
395 /*
396 * Parsing the rule in-place, filling all white-spaces with '\0'
397 */
398 for (i = 0; i < tokens; ++i) {
399 while (isspace(data[cnt]))
400 data[cnt++] = '\0';
401
402 if (data[cnt] == '\0')
403 /* Unexpected end of data */
404 return -EINVAL;
405
406 tok[i] = data + cnt;
407
408 while (data[cnt] && !isspace(data[cnt]))
409 ++cnt;
410 }
411 while (isspace(data[cnt]))
412 data[cnt++] = '\0';
413
414 while (i < 4)
415 tok[i++] = NULL;
416
417 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
418 return rc == 0 ? cnt : rc;
419 }
420
421 #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
422 #define SMK_LONG_FMT 1 /* Variable long label format */
423 #define SMK_CHANGE_FMT 2 /* Rule modification format */
424 /**
425 * smk_write_rules_list - write() for any /smack rule file
426 * @file: file pointer, not actually used
427 * @buf: where to get the data from
428 * @count: bytes sent
429 * @ppos: where to start - must be 0
430 * @rule_list: the list of rules to write to
431 * @rule_lock: lock for the rule list
432 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
433 *
434 * Get one smack access rule from above.
435 * The format for SMK_LONG_FMT is:
436 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
437 * The format for SMK_FIXED24_FMT is exactly:
438 * "subject object rwxat"
439 * The format for SMK_CHANGE_FMT is:
440 * "subject<whitespace>object<whitespace>
441 * acc_enable<whitespace>acc_disable[<whitespace>...]"
442 */
smk_write_rules_list(struct file * file,const char __user * buf,size_t count,loff_t * ppos,struct list_head * rule_list,struct mutex * rule_lock,int format)443 static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
444 size_t count, loff_t *ppos,
445 struct list_head *rule_list,
446 struct mutex *rule_lock, int format)
447 {
448 struct smack_parsed_rule rule;
449 char *data;
450 int rc;
451 int trunc = 0;
452 int tokens;
453 ssize_t cnt = 0;
454
455 /*
456 * No partial writes.
457 * Enough data must be present.
458 */
459 if (*ppos != 0)
460 return -EINVAL;
461
462 if (format == SMK_FIXED24_FMT) {
463 /*
464 * Minor hack for backward compatibility
465 */
466 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
467 return -EINVAL;
468 } else {
469 if (count >= PAGE_SIZE) {
470 count = PAGE_SIZE - 1;
471 trunc = 1;
472 }
473 }
474
475 data = memdup_user_nul(buf, count);
476 if (IS_ERR(data))
477 return PTR_ERR(data);
478
479 /*
480 * In case of parsing only part of user buf,
481 * avoid having partial rule at the data buffer
482 */
483 if (trunc) {
484 while (count > 0 && (data[count - 1] != '\n'))
485 --count;
486 if (count == 0) {
487 rc = -EINVAL;
488 goto out;
489 }
490 }
491
492 data[count] = '\0';
493 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
494 while (cnt < count) {
495 if (format == SMK_FIXED24_FMT) {
496 rc = smk_parse_rule(data, &rule, 1);
497 if (rc < 0)
498 goto out;
499 cnt = count;
500 } else {
501 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
502 if (rc < 0)
503 goto out;
504 if (rc == 0) {
505 rc = -EINVAL;
506 goto out;
507 }
508 cnt += rc;
509 }
510
511 if (rule_list == NULL)
512 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
513 &rule.smk_subject->smk_rules_lock);
514 else
515 rc = smk_set_access(&rule, rule_list, rule_lock);
516
517 if (rc)
518 goto out;
519 }
520
521 rc = cnt;
522 out:
523 kfree(data);
524 return rc;
525 }
526
527 /*
528 * Core logic for smackfs seq list operations.
529 */
530
smk_seq_start(struct seq_file * s,loff_t * pos,struct list_head * head)531 static void *smk_seq_start(struct seq_file *s, loff_t *pos,
532 struct list_head *head)
533 {
534 struct list_head *list;
535 int i = *pos;
536
537 rcu_read_lock();
538 for (list = rcu_dereference(list_next_rcu(head));
539 list != head;
540 list = rcu_dereference(list_next_rcu(list))) {
541 if (i-- == 0)
542 return list;
543 }
544
545 return NULL;
546 }
547
smk_seq_next(struct seq_file * s,void * v,loff_t * pos,struct list_head * head)548 static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
549 struct list_head *head)
550 {
551 struct list_head *list = v;
552
553 ++*pos;
554 list = rcu_dereference(list_next_rcu(list));
555
556 return (list == head) ? NULL : list;
557 }
558
smk_seq_stop(struct seq_file * s,void * v)559 static void smk_seq_stop(struct seq_file *s, void *v)
560 {
561 rcu_read_unlock();
562 }
563
smk_rule_show(struct seq_file * s,struct smack_rule * srp,int max)564 static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
565 {
566 /*
567 * Don't show any rules with label names too long for
568 * interface file (/smack/load or /smack/load2)
569 * because you should expect to be able to write
570 * anything you read back.
571 */
572 if (strlen(srp->smk_subject->smk_known) >= max ||
573 strlen(srp->smk_object->smk_known) >= max)
574 return;
575
576 if (srp->smk_access == 0)
577 return;
578
579 seq_printf(s, "%s %s",
580 srp->smk_subject->smk_known,
581 srp->smk_object->smk_known);
582
583 seq_putc(s, ' ');
584
585 if (srp->smk_access & MAY_READ)
586 seq_putc(s, 'r');
587 if (srp->smk_access & MAY_WRITE)
588 seq_putc(s, 'w');
589 if (srp->smk_access & MAY_EXEC)
590 seq_putc(s, 'x');
591 if (srp->smk_access & MAY_APPEND)
592 seq_putc(s, 'a');
593 if (srp->smk_access & MAY_TRANSMUTE)
594 seq_putc(s, 't');
595 if (srp->smk_access & MAY_LOCK)
596 seq_putc(s, 'l');
597 if (srp->smk_access & MAY_BRINGUP)
598 seq_putc(s, 'b');
599
600 seq_putc(s, '\n');
601 }
602
603 /*
604 * Seq_file read operations for /smack/load
605 */
606
load2_seq_start(struct seq_file * s,loff_t * pos)607 static void *load2_seq_start(struct seq_file *s, loff_t *pos)
608 {
609 return smk_seq_start(s, pos, &smack_known_list);
610 }
611
load2_seq_next(struct seq_file * s,void * v,loff_t * pos)612 static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
613 {
614 return smk_seq_next(s, v, pos, &smack_known_list);
615 }
616
load_seq_show(struct seq_file * s,void * v)617 static int load_seq_show(struct seq_file *s, void *v)
618 {
619 struct list_head *list = v;
620 struct smack_rule *srp;
621 struct smack_known *skp =
622 list_entry_rcu(list, struct smack_known, list);
623
624 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
625 smk_rule_show(s, srp, SMK_LABELLEN);
626
627 return 0;
628 }
629
630 static const struct seq_operations load_seq_ops = {
631 .start = load2_seq_start,
632 .next = load2_seq_next,
633 .show = load_seq_show,
634 .stop = smk_seq_stop,
635 };
636
637 /**
638 * smk_open_load - open() for /smack/load
639 * @inode: inode structure representing file
640 * @file: "load" file pointer
641 *
642 * For reading, use load_seq_* seq_file reading operations.
643 */
smk_open_load(struct inode * inode,struct file * file)644 static int smk_open_load(struct inode *inode, struct file *file)
645 {
646 return seq_open(file, &load_seq_ops);
647 }
648
649 /**
650 * smk_write_load - write() for /smack/load
651 * @file: file pointer, not actually used
652 * @buf: where to get the data from
653 * @count: bytes sent
654 * @ppos: where to start - must be 0
655 *
656 */
smk_write_load(struct file * file,const char __user * buf,size_t count,loff_t * ppos)657 static ssize_t smk_write_load(struct file *file, const char __user *buf,
658 size_t count, loff_t *ppos)
659 {
660 /*
661 * Must have privilege.
662 * No partial writes.
663 * Enough data must be present.
664 */
665 if (!smack_privileged(CAP_MAC_ADMIN))
666 return -EPERM;
667
668 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
669 SMK_FIXED24_FMT);
670 }
671
672 static const struct file_operations smk_load_ops = {
673 .open = smk_open_load,
674 .read = seq_read,
675 .llseek = seq_lseek,
676 .write = smk_write_load,
677 .release = seq_release,
678 };
679
680 /**
681 * smk_cipso_doi - initialize the CIPSO domain
682 */
smk_cipso_doi(void)683 static void smk_cipso_doi(void)
684 {
685 int rc;
686 struct cipso_v4_doi *doip;
687 struct netlbl_audit nai;
688
689 smk_netlabel_audit_set(&nai);
690
691 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
692 if (rc != 0)
693 printk(KERN_WARNING "%s:%d remove rc = %d\n",
694 __func__, __LINE__, rc);
695
696 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
697 if (doip == NULL)
698 panic("smack: Failed to initialize cipso DOI.\n");
699 doip->map.std = NULL;
700 doip->doi = smk_cipso_doi_value;
701 doip->type = CIPSO_V4_MAP_PASS;
702 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
703 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
704 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
705
706 rc = netlbl_cfg_cipsov4_add(doip, &nai);
707 if (rc != 0) {
708 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
709 __func__, __LINE__, rc);
710 kfree(doip);
711 return;
712 }
713 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
714 if (rc != 0) {
715 printk(KERN_WARNING "%s:%d map add rc = %d\n",
716 __func__, __LINE__, rc);
717 kfree(doip);
718 return;
719 }
720 }
721
722 /**
723 * smk_unlbl_ambient - initialize the unlabeled domain
724 * @oldambient: previous domain string
725 */
smk_unlbl_ambient(char * oldambient)726 static void smk_unlbl_ambient(char *oldambient)
727 {
728 int rc;
729 struct netlbl_audit nai;
730
731 smk_netlabel_audit_set(&nai);
732
733 if (oldambient != NULL) {
734 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
735 if (rc != 0)
736 printk(KERN_WARNING "%s:%d remove rc = %d\n",
737 __func__, __LINE__, rc);
738 }
739 if (smack_net_ambient == NULL)
740 smack_net_ambient = &smack_known_floor;
741
742 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
743 NULL, NULL, &nai);
744 if (rc != 0)
745 printk(KERN_WARNING "%s:%d add rc = %d\n",
746 __func__, __LINE__, rc);
747 }
748
749 /*
750 * Seq_file read operations for /smack/cipso
751 */
752
cipso_seq_start(struct seq_file * s,loff_t * pos)753 static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
754 {
755 return smk_seq_start(s, pos, &smack_known_list);
756 }
757
cipso_seq_next(struct seq_file * s,void * v,loff_t * pos)758 static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
759 {
760 return smk_seq_next(s, v, pos, &smack_known_list);
761 }
762
763 /*
764 * Print cipso labels in format:
765 * label level[/cat[,cat]]
766 */
cipso_seq_show(struct seq_file * s,void * v)767 static int cipso_seq_show(struct seq_file *s, void *v)
768 {
769 struct list_head *list = v;
770 struct smack_known *skp =
771 list_entry_rcu(list, struct smack_known, list);
772 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
773 char sep = '/';
774 int i;
775
776 /*
777 * Don't show a label that could not have been set using
778 * /smack/cipso. This is in support of the notion that
779 * anything read from /smack/cipso ought to be writeable
780 * to /smack/cipso.
781 *
782 * /smack/cipso2 should be used instead.
783 */
784 if (strlen(skp->smk_known) >= SMK_LABELLEN)
785 return 0;
786
787 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
788
789 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
790 i = netlbl_catmap_walk(cmp, i + 1)) {
791 seq_printf(s, "%c%d", sep, i);
792 sep = ',';
793 }
794
795 seq_putc(s, '\n');
796
797 return 0;
798 }
799
800 static const struct seq_operations cipso_seq_ops = {
801 .start = cipso_seq_start,
802 .next = cipso_seq_next,
803 .show = cipso_seq_show,
804 .stop = smk_seq_stop,
805 };
806
807 /**
808 * smk_open_cipso - open() for /smack/cipso
809 * @inode: inode structure representing file
810 * @file: "cipso" file pointer
811 *
812 * Connect our cipso_seq_* operations with /smack/cipso
813 * file_operations
814 */
smk_open_cipso(struct inode * inode,struct file * file)815 static int smk_open_cipso(struct inode *inode, struct file *file)
816 {
817 return seq_open(file, &cipso_seq_ops);
818 }
819
820 /**
821 * smk_set_cipso - do the work for write() for cipso and cipso2
822 * @file: file pointer, not actually used
823 * @buf: where to get the data from
824 * @count: bytes sent
825 * @ppos: where to start
826 * @format: /smack/cipso or /smack/cipso2
827 *
828 * Accepts only one cipso rule per write call.
829 * Returns number of bytes written or error code, as appropriate
830 */
smk_set_cipso(struct file * file,const char __user * buf,size_t count,loff_t * ppos,int format)831 static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
832 size_t count, loff_t *ppos, int format)
833 {
834 struct smack_known *skp;
835 struct netlbl_lsm_secattr ncats;
836 char mapcatset[SMK_CIPSOLEN];
837 int maplevel;
838 unsigned int cat;
839 int catlen;
840 ssize_t rc = -EINVAL;
841 char *data = NULL;
842 char *rule;
843 int ret;
844 int i;
845
846 /*
847 * Must have privilege.
848 * No partial writes.
849 * Enough data must be present.
850 */
851 if (!smack_privileged(CAP_MAC_ADMIN))
852 return -EPERM;
853 if (*ppos != 0)
854 return -EINVAL;
855 if (format == SMK_FIXED24_FMT &&
856 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
857 return -EINVAL;
858
859 data = memdup_user_nul(buf, count);
860 if (IS_ERR(data))
861 return PTR_ERR(data);
862
863 rule = data;
864 /*
865 * Only allow one writer at a time. Writes should be
866 * quite rare and small in any case.
867 */
868 mutex_lock(&smack_cipso_lock);
869
870 skp = smk_import_entry(rule, 0);
871 if (IS_ERR(skp)) {
872 rc = PTR_ERR(skp);
873 goto out;
874 }
875
876 if (format == SMK_FIXED24_FMT)
877 rule += SMK_LABELLEN;
878 else
879 rule += strlen(skp->smk_known) + 1;
880
881 if (rule > data + count) {
882 rc = -EOVERFLOW;
883 goto out;
884 }
885
886 ret = sscanf(rule, "%d", &maplevel);
887 if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL)
888 goto out;
889
890 rule += SMK_DIGITLEN;
891 if (rule > data + count) {
892 rc = -EOVERFLOW;
893 goto out;
894 }
895
896 ret = sscanf(rule, "%d", &catlen);
897 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
898 goto out;
899
900 if (format == SMK_FIXED24_FMT &&
901 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
902 goto out;
903
904 memset(mapcatset, 0, sizeof(mapcatset));
905
906 for (i = 0; i < catlen; i++) {
907 rule += SMK_DIGITLEN;
908 if (rule > data + count) {
909 rc = -EOVERFLOW;
910 goto out;
911 }
912 ret = sscanf(rule, "%u", &cat);
913 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
914 goto out;
915
916 smack_catset_bit(cat, mapcatset);
917 }
918
919 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
920 if (rc >= 0) {
921 netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat);
922 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
923 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
924 rc = count;
925 /*
926 * This mapping may have been cached, so clear the cache.
927 */
928 netlbl_cache_invalidate();
929 }
930
931 out:
932 mutex_unlock(&smack_cipso_lock);
933 kfree(data);
934 return rc;
935 }
936
937 /**
938 * smk_write_cipso - write() for /smack/cipso
939 * @file: file pointer, not actually used
940 * @buf: where to get the data from
941 * @count: bytes sent
942 * @ppos: where to start
943 *
944 * Accepts only one cipso rule per write call.
945 * Returns number of bytes written or error code, as appropriate
946 */
smk_write_cipso(struct file * file,const char __user * buf,size_t count,loff_t * ppos)947 static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
948 size_t count, loff_t *ppos)
949 {
950 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
951 }
952
953 static const struct file_operations smk_cipso_ops = {
954 .open = smk_open_cipso,
955 .read = seq_read,
956 .llseek = seq_lseek,
957 .write = smk_write_cipso,
958 .release = seq_release,
959 };
960
961 /*
962 * Seq_file read operations for /smack/cipso2
963 */
964
965 /*
966 * Print cipso labels in format:
967 * label level[/cat[,cat]]
968 */
cipso2_seq_show(struct seq_file * s,void * v)969 static int cipso2_seq_show(struct seq_file *s, void *v)
970 {
971 struct list_head *list = v;
972 struct smack_known *skp =
973 list_entry_rcu(list, struct smack_known, list);
974 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
975 char sep = '/';
976 int i;
977
978 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
979
980 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
981 i = netlbl_catmap_walk(cmp, i + 1)) {
982 seq_printf(s, "%c%d", sep, i);
983 sep = ',';
984 }
985
986 seq_putc(s, '\n');
987
988 return 0;
989 }
990
991 static const struct seq_operations cipso2_seq_ops = {
992 .start = cipso_seq_start,
993 .next = cipso_seq_next,
994 .show = cipso2_seq_show,
995 .stop = smk_seq_stop,
996 };
997
998 /**
999 * smk_open_cipso2 - open() for /smack/cipso2
1000 * @inode: inode structure representing file
1001 * @file: "cipso2" file pointer
1002 *
1003 * Connect our cipso_seq_* operations with /smack/cipso2
1004 * file_operations
1005 */
smk_open_cipso2(struct inode * inode,struct file * file)1006 static int smk_open_cipso2(struct inode *inode, struct file *file)
1007 {
1008 return seq_open(file, &cipso2_seq_ops);
1009 }
1010
1011 /**
1012 * smk_write_cipso2 - write() for /smack/cipso2
1013 * @file: file pointer, not actually used
1014 * @buf: where to get the data from
1015 * @count: bytes sent
1016 * @ppos: where to start
1017 *
1018 * Accepts only one cipso rule per write call.
1019 * Returns number of bytes written or error code, as appropriate
1020 */
smk_write_cipso2(struct file * file,const char __user * buf,size_t count,loff_t * ppos)1021 static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1022 size_t count, loff_t *ppos)
1023 {
1024 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1025 }
1026
1027 static const struct file_operations smk_cipso2_ops = {
1028 .open = smk_open_cipso2,
1029 .read = seq_read,
1030 .llseek = seq_lseek,
1031 .write = smk_write_cipso2,
1032 .release = seq_release,
1033 };
1034
1035 /*
1036 * Seq_file read operations for /smack/netlabel
1037 */
1038
net4addr_seq_start(struct seq_file * s,loff_t * pos)1039 static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1040 {
1041 return smk_seq_start(s, pos, &smk_net4addr_list);
1042 }
1043
net4addr_seq_next(struct seq_file * s,void * v,loff_t * pos)1044 static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1045 {
1046 return smk_seq_next(s, v, pos, &smk_net4addr_list);
1047 }
1048
1049 /*
1050 * Print host/label pairs
1051 */
net4addr_seq_show(struct seq_file * s,void * v)1052 static int net4addr_seq_show(struct seq_file *s, void *v)
1053 {
1054 struct list_head *list = v;
1055 struct smk_net4addr *skp =
1056 list_entry_rcu(list, struct smk_net4addr, list);
1057 char *kp = SMACK_CIPSO_OPTION;
1058
1059 if (skp->smk_label != NULL)
1060 kp = skp->smk_label->smk_known;
1061 seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1062 skp->smk_masks, kp);
1063
1064 return 0;
1065 }
1066
1067 static const struct seq_operations net4addr_seq_ops = {
1068 .start = net4addr_seq_start,
1069 .next = net4addr_seq_next,
1070 .show = net4addr_seq_show,
1071 .stop = smk_seq_stop,
1072 };
1073
1074 /**
1075 * smk_open_net4addr - open() for /smack/netlabel
1076 * @inode: inode structure representing file
1077 * @file: "netlabel" file pointer
1078 *
1079 * Connect our net4addr_seq_* operations with /smack/netlabel
1080 * file_operations
1081 */
smk_open_net4addr(struct inode * inode,struct file * file)1082 static int smk_open_net4addr(struct inode *inode, struct file *file)
1083 {
1084 return seq_open(file, &net4addr_seq_ops);
1085 }
1086
1087 /**
1088 * smk_net4addr_insert
1089 * @new : netlabel to insert
1090 *
1091 * This helper insert netlabel in the smack_net4addrs list
1092 * sorted by netmask length (longest to smallest)
1093 * locked by &smk_net4addr_lock in smk_write_net4addr
1094 *
1095 */
smk_net4addr_insert(struct smk_net4addr * new)1096 static void smk_net4addr_insert(struct smk_net4addr *new)
1097 {
1098 struct smk_net4addr *m;
1099 struct smk_net4addr *m_next;
1100
1101 if (list_empty(&smk_net4addr_list)) {
1102 list_add_rcu(&new->list, &smk_net4addr_list);
1103 return;
1104 }
1105
1106 m = list_entry_rcu(smk_net4addr_list.next,
1107 struct smk_net4addr, list);
1108
1109 /* the comparison '>' is a bit hacky, but works */
1110 if (new->smk_masks > m->smk_masks) {
1111 list_add_rcu(&new->list, &smk_net4addr_list);
1112 return;
1113 }
1114
1115 list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1116 if (list_is_last(&m->list, &smk_net4addr_list)) {
1117 list_add_rcu(&new->list, &m->list);
1118 return;
1119 }
1120 m_next = list_entry_rcu(m->list.next,
1121 struct smk_net4addr, list);
1122 if (new->smk_masks > m_next->smk_masks) {
1123 list_add_rcu(&new->list, &m->list);
1124 return;
1125 }
1126 }
1127 }
1128
1129
1130 /**
1131 * smk_write_net4addr - write() for /smack/netlabel
1132 * @file: file pointer, not actually used
1133 * @buf: where to get the data from
1134 * @count: bytes sent
1135 * @ppos: where to start
1136 *
1137 * Accepts only one net4addr per write call.
1138 * Returns number of bytes written or error code, as appropriate
1139 */
smk_write_net4addr(struct file * file,const char __user * buf,size_t count,loff_t * ppos)1140 static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1141 size_t count, loff_t *ppos)
1142 {
1143 struct smk_net4addr *snp;
1144 struct sockaddr_in newname;
1145 char *smack;
1146 struct smack_known *skp = NULL;
1147 char *data;
1148 char *host = (char *)&newname.sin_addr.s_addr;
1149 int rc;
1150 struct netlbl_audit audit_info;
1151 struct in_addr mask;
1152 unsigned int m;
1153 unsigned int masks;
1154 int found;
1155 u32 mask_bits = (1<<31);
1156 __be32 nsa;
1157 u32 temp_mask;
1158
1159 /*
1160 * Must have privilege.
1161 * No partial writes.
1162 * Enough data must be present.
1163 * "<addr/mask, as a.b.c.d/e><space><label>"
1164 * "<addr, as a.b.c.d><space><label>"
1165 */
1166 if (!smack_privileged(CAP_MAC_ADMIN))
1167 return -EPERM;
1168 if (*ppos != 0)
1169 return -EINVAL;
1170 if (count < SMK_NETLBLADDRMIN)
1171 return -EINVAL;
1172
1173 data = memdup_user_nul(buf, count);
1174 if (IS_ERR(data))
1175 return PTR_ERR(data);
1176
1177 smack = kzalloc(count + 1, GFP_KERNEL);
1178 if (smack == NULL) {
1179 rc = -ENOMEM;
1180 goto free_data_out;
1181 }
1182
1183 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1184 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1185 if (rc != 6) {
1186 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1187 &host[0], &host[1], &host[2], &host[3], smack);
1188 if (rc != 5) {
1189 rc = -EINVAL;
1190 goto free_out;
1191 }
1192 m = BEBITS;
1193 masks = 32;
1194 }
1195 if (masks > BEBITS) {
1196 rc = -EINVAL;
1197 goto free_out;
1198 }
1199
1200 /*
1201 * If smack begins with '-', it is an option, don't import it
1202 */
1203 if (smack[0] != '-') {
1204 skp = smk_import_entry(smack, 0);
1205 if (IS_ERR(skp)) {
1206 rc = PTR_ERR(skp);
1207 goto free_out;
1208 }
1209 } else {
1210 /*
1211 * Only the -CIPSO option is supported for IPv4
1212 */
1213 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1214 rc = -EINVAL;
1215 goto free_out;
1216 }
1217 }
1218
1219 for (m = masks, temp_mask = 0; m > 0; m--) {
1220 temp_mask |= mask_bits;
1221 mask_bits >>= 1;
1222 }
1223 mask.s_addr = cpu_to_be32(temp_mask);
1224
1225 newname.sin_addr.s_addr &= mask.s_addr;
1226 /*
1227 * Only allow one writer at a time. Writes should be
1228 * quite rare and small in any case.
1229 */
1230 mutex_lock(&smk_net4addr_lock);
1231
1232 nsa = newname.sin_addr.s_addr;
1233 /* try to find if the prefix is already in the list */
1234 found = 0;
1235 list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1236 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1237 found = 1;
1238 break;
1239 }
1240 }
1241 smk_netlabel_audit_set(&audit_info);
1242
1243 if (found == 0) {
1244 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1245 if (snp == NULL)
1246 rc = -ENOMEM;
1247 else {
1248 rc = 0;
1249 snp->smk_host.s_addr = newname.sin_addr.s_addr;
1250 snp->smk_mask.s_addr = mask.s_addr;
1251 snp->smk_label = skp;
1252 snp->smk_masks = masks;
1253 smk_net4addr_insert(snp);
1254 }
1255 } else {
1256 /*
1257 * Delete the unlabeled entry, only if the previous label
1258 * wasn't the special CIPSO option
1259 */
1260 if (snp->smk_label != NULL)
1261 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1262 &snp->smk_host, &snp->smk_mask,
1263 PF_INET, &audit_info);
1264 else
1265 rc = 0;
1266 snp->smk_label = skp;
1267 }
1268
1269 /*
1270 * Now tell netlabel about the single label nature of
1271 * this host so that incoming packets get labeled.
1272 * but only if we didn't get the special CIPSO option
1273 */
1274 if (rc == 0 && skp != NULL)
1275 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1276 &snp->smk_host, &snp->smk_mask, PF_INET,
1277 snp->smk_label->smk_secid, &audit_info);
1278
1279 if (rc == 0)
1280 rc = count;
1281
1282 mutex_unlock(&smk_net4addr_lock);
1283
1284 free_out:
1285 kfree(smack);
1286 free_data_out:
1287 kfree(data);
1288
1289 return rc;
1290 }
1291
1292 static const struct file_operations smk_net4addr_ops = {
1293 .open = smk_open_net4addr,
1294 .read = seq_read,
1295 .llseek = seq_lseek,
1296 .write = smk_write_net4addr,
1297 .release = seq_release,
1298 };
1299
1300 #if IS_ENABLED(CONFIG_IPV6)
1301 /*
1302 * Seq_file read operations for /smack/netlabel6
1303 */
1304
net6addr_seq_start(struct seq_file * s,loff_t * pos)1305 static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1306 {
1307 return smk_seq_start(s, pos, &smk_net6addr_list);
1308 }
1309
net6addr_seq_next(struct seq_file * s,void * v,loff_t * pos)1310 static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1311 {
1312 return smk_seq_next(s, v, pos, &smk_net6addr_list);
1313 }
1314
1315 /*
1316 * Print host/label pairs
1317 */
net6addr_seq_show(struct seq_file * s,void * v)1318 static int net6addr_seq_show(struct seq_file *s, void *v)
1319 {
1320 struct list_head *list = v;
1321 struct smk_net6addr *skp =
1322 list_entry(list, struct smk_net6addr, list);
1323
1324 if (skp->smk_label != NULL)
1325 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1326 skp->smk_label->smk_known);
1327
1328 return 0;
1329 }
1330
1331 static const struct seq_operations net6addr_seq_ops = {
1332 .start = net6addr_seq_start,
1333 .next = net6addr_seq_next,
1334 .show = net6addr_seq_show,
1335 .stop = smk_seq_stop,
1336 };
1337
1338 /**
1339 * smk_open_net6addr - open() for /smack/netlabel
1340 * @inode: inode structure representing file
1341 * @file: "netlabel" file pointer
1342 *
1343 * Connect our net6addr_seq_* operations with /smack/netlabel
1344 * file_operations
1345 */
smk_open_net6addr(struct inode * inode,struct file * file)1346 static int smk_open_net6addr(struct inode *inode, struct file *file)
1347 {
1348 return seq_open(file, &net6addr_seq_ops);
1349 }
1350
1351 /**
1352 * smk_net6addr_insert
1353 * @new : entry to insert
1354 *
1355 * This inserts an entry in the smack_net6addrs list
1356 * sorted by netmask length (longest to smallest)
1357 * locked by &smk_net6addr_lock in smk_write_net6addr
1358 *
1359 */
smk_net6addr_insert(struct smk_net6addr * new)1360 static void smk_net6addr_insert(struct smk_net6addr *new)
1361 {
1362 struct smk_net6addr *m_next;
1363 struct smk_net6addr *m;
1364
1365 if (list_empty(&smk_net6addr_list)) {
1366 list_add_rcu(&new->list, &smk_net6addr_list);
1367 return;
1368 }
1369
1370 m = list_entry_rcu(smk_net6addr_list.next,
1371 struct smk_net6addr, list);
1372
1373 if (new->smk_masks > m->smk_masks) {
1374 list_add_rcu(&new->list, &smk_net6addr_list);
1375 return;
1376 }
1377
1378 list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1379 if (list_is_last(&m->list, &smk_net6addr_list)) {
1380 list_add_rcu(&new->list, &m->list);
1381 return;
1382 }
1383 m_next = list_entry_rcu(m->list.next,
1384 struct smk_net6addr, list);
1385 if (new->smk_masks > m_next->smk_masks) {
1386 list_add_rcu(&new->list, &m->list);
1387 return;
1388 }
1389 }
1390 }
1391
1392
1393 /**
1394 * smk_write_net6addr - write() for /smack/netlabel
1395 * @file: file pointer, not actually used
1396 * @buf: where to get the data from
1397 * @count: bytes sent
1398 * @ppos: where to start
1399 *
1400 * Accepts only one net6addr per write call.
1401 * Returns number of bytes written or error code, as appropriate
1402 */
smk_write_net6addr(struct file * file,const char __user * buf,size_t count,loff_t * ppos)1403 static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1404 size_t count, loff_t *ppos)
1405 {
1406 struct smk_net6addr *snp;
1407 struct in6_addr newname;
1408 struct in6_addr fullmask;
1409 struct smack_known *skp = NULL;
1410 char *smack;
1411 char *data;
1412 int rc = 0;
1413 int found = 0;
1414 int i;
1415 unsigned int scanned[8];
1416 unsigned int m;
1417 unsigned int mask = 128;
1418
1419 /*
1420 * Must have privilege.
1421 * No partial writes.
1422 * Enough data must be present.
1423 * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1424 * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1425 */
1426 if (!smack_privileged(CAP_MAC_ADMIN))
1427 return -EPERM;
1428 if (*ppos != 0)
1429 return -EINVAL;
1430 if (count < SMK_NETLBLADDRMIN)
1431 return -EINVAL;
1432
1433 data = memdup_user_nul(buf, count);
1434 if (IS_ERR(data))
1435 return PTR_ERR(data);
1436
1437 smack = kzalloc(count + 1, GFP_KERNEL);
1438 if (smack == NULL) {
1439 rc = -ENOMEM;
1440 goto free_data_out;
1441 }
1442
1443 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1444 &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1445 &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1446 &mask, smack);
1447 if (i != 10) {
1448 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1449 &scanned[0], &scanned[1], &scanned[2],
1450 &scanned[3], &scanned[4], &scanned[5],
1451 &scanned[6], &scanned[7], smack);
1452 if (i != 9) {
1453 rc = -EINVAL;
1454 goto free_out;
1455 }
1456 }
1457 if (mask > 128) {
1458 rc = -EINVAL;
1459 goto free_out;
1460 }
1461 for (i = 0; i < 8; i++) {
1462 if (scanned[i] > 0xffff) {
1463 rc = -EINVAL;
1464 goto free_out;
1465 }
1466 newname.s6_addr16[i] = htons(scanned[i]);
1467 }
1468
1469 /*
1470 * If smack begins with '-', it is an option, don't import it
1471 */
1472 if (smack[0] != '-') {
1473 skp = smk_import_entry(smack, 0);
1474 if (IS_ERR(skp)) {
1475 rc = PTR_ERR(skp);
1476 goto free_out;
1477 }
1478 } else {
1479 /*
1480 * Only -DELETE is supported for IPv6
1481 */
1482 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1483 rc = -EINVAL;
1484 goto free_out;
1485 }
1486 }
1487
1488 for (i = 0, m = mask; i < 8; i++) {
1489 if (m >= 16) {
1490 fullmask.s6_addr16[i] = 0xffff;
1491 m -= 16;
1492 } else if (m > 0) {
1493 fullmask.s6_addr16[i] = (1 << m) - 1;
1494 m = 0;
1495 } else
1496 fullmask.s6_addr16[i] = 0;
1497 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1498 }
1499
1500 /*
1501 * Only allow one writer at a time. Writes should be
1502 * quite rare and small in any case.
1503 */
1504 mutex_lock(&smk_net6addr_lock);
1505 /*
1506 * Try to find the prefix in the list
1507 */
1508 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1509 if (mask != snp->smk_masks)
1510 continue;
1511 for (found = 1, i = 0; i < 8; i++) {
1512 if (newname.s6_addr16[i] !=
1513 snp->smk_host.s6_addr16[i]) {
1514 found = 0;
1515 break;
1516 }
1517 }
1518 if (found == 1)
1519 break;
1520 }
1521 if (found == 0) {
1522 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1523 if (snp == NULL)
1524 rc = -ENOMEM;
1525 else {
1526 snp->smk_host = newname;
1527 snp->smk_mask = fullmask;
1528 snp->smk_masks = mask;
1529 snp->smk_label = skp;
1530 smk_net6addr_insert(snp);
1531 }
1532 } else {
1533 snp->smk_label = skp;
1534 }
1535
1536 if (rc == 0)
1537 rc = count;
1538
1539 mutex_unlock(&smk_net6addr_lock);
1540
1541 free_out:
1542 kfree(smack);
1543 free_data_out:
1544 kfree(data);
1545
1546 return rc;
1547 }
1548
1549 static const struct file_operations smk_net6addr_ops = {
1550 .open = smk_open_net6addr,
1551 .read = seq_read,
1552 .llseek = seq_lseek,
1553 .write = smk_write_net6addr,
1554 .release = seq_release,
1555 };
1556 #endif /* CONFIG_IPV6 */
1557
1558 /**
1559 * smk_read_doi - read() for /smack/doi
1560 * @filp: file pointer, not actually used
1561 * @buf: where to put the result
1562 * @count: maximum to send along
1563 * @ppos: where to start
1564 *
1565 * Returns number of bytes read or error code, as appropriate
1566 */
smk_read_doi(struct file * filp,char __user * buf,size_t count,loff_t * ppos)1567 static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1568 size_t count, loff_t *ppos)
1569 {
1570 char temp[80];
1571 ssize_t rc;
1572
1573 if (*ppos != 0)
1574 return 0;
1575
1576 sprintf(temp, "%d", smk_cipso_doi_value);
1577 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1578
1579 return rc;
1580 }
1581
1582 /**
1583 * smk_write_doi - write() for /smack/doi
1584 * @file: file pointer, not actually used
1585 * @buf: where to get the data from
1586 * @count: bytes sent
1587 * @ppos: where to start
1588 *
1589 * Returns number of bytes written or error code, as appropriate
1590 */
smk_write_doi(struct file * file,const char __user * buf,size_t count,loff_t * ppos)1591 static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1592 size_t count, loff_t *ppos)
1593 {
1594 char temp[80];
1595 int i;
1596
1597 if (!smack_privileged(CAP_MAC_ADMIN))
1598 return -EPERM;
1599
1600 if (count >= sizeof(temp) || count == 0)
1601 return -EINVAL;
1602
1603 if (copy_from_user(temp, buf, count) != 0)
1604 return -EFAULT;
1605
1606 temp[count] = '\0';
1607
1608 if (sscanf(temp, "%d", &i) != 1)
1609 return -EINVAL;
1610
1611 smk_cipso_doi_value = i;
1612
1613 smk_cipso_doi();
1614
1615 return count;
1616 }
1617
1618 static const struct file_operations smk_doi_ops = {
1619 .read = smk_read_doi,
1620 .write = smk_write_doi,
1621 .llseek = default_llseek,
1622 };
1623
1624 /**
1625 * smk_read_direct - read() for /smack/direct
1626 * @filp: file pointer, not actually used
1627 * @buf: where to put the result
1628 * @count: maximum to send along
1629 * @ppos: where to start
1630 *
1631 * Returns number of bytes read or error code, as appropriate
1632 */
smk_read_direct(struct file * filp,char __user * buf,size_t count,loff_t * ppos)1633 static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1634 size_t count, loff_t *ppos)
1635 {
1636 char temp[80];
1637 ssize_t rc;
1638
1639 if (*ppos != 0)
1640 return 0;
1641
1642 sprintf(temp, "%d", smack_cipso_direct);
1643 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1644
1645 return rc;
1646 }
1647
1648 /**
1649 * smk_write_direct - write() for /smack/direct
1650 * @file: file pointer, not actually used
1651 * @buf: where to get the data from
1652 * @count: bytes sent
1653 * @ppos: where to start
1654 *
1655 * Returns number of bytes written or error code, as appropriate
1656 */
smk_write_direct(struct file * file,const char __user * buf,size_t count,loff_t * ppos)1657 static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1658 size_t count, loff_t *ppos)
1659 {
1660 struct smack_known *skp;
1661 char temp[80];
1662 int i;
1663
1664 if (!smack_privileged(CAP_MAC_ADMIN))
1665 return -EPERM;
1666
1667 if (count >= sizeof(temp) || count == 0)
1668 return -EINVAL;
1669
1670 if (copy_from_user(temp, buf, count) != 0)
1671 return -EFAULT;
1672
1673 temp[count] = '\0';
1674
1675 if (sscanf(temp, "%d", &i) != 1)
1676 return -EINVAL;
1677
1678 /*
1679 * Don't do anything if the value hasn't actually changed.
1680 * If it is changing reset the level on entries that were
1681 * set up to be direct when they were created.
1682 */
1683 if (smack_cipso_direct != i) {
1684 mutex_lock(&smack_known_lock);
1685 list_for_each_entry_rcu(skp, &smack_known_list, list)
1686 if (skp->smk_netlabel.attr.mls.lvl ==
1687 smack_cipso_direct)
1688 skp->smk_netlabel.attr.mls.lvl = i;
1689 smack_cipso_direct = i;
1690 mutex_unlock(&smack_known_lock);
1691 }
1692
1693 return count;
1694 }
1695
1696 static const struct file_operations smk_direct_ops = {
1697 .read = smk_read_direct,
1698 .write = smk_write_direct,
1699 .llseek = default_llseek,
1700 };
1701
1702 /**
1703 * smk_read_mapped - read() for /smack/mapped
1704 * @filp: file pointer, not actually used
1705 * @buf: where to put the result
1706 * @count: maximum to send along
1707 * @ppos: where to start
1708 *
1709 * Returns number of bytes read or error code, as appropriate
1710 */
smk_read_mapped(struct file * filp,char __user * buf,size_t count,loff_t * ppos)1711 static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1712 size_t count, loff_t *ppos)
1713 {
1714 char temp[80];
1715 ssize_t rc;
1716
1717 if (*ppos != 0)
1718 return 0;
1719
1720 sprintf(temp, "%d", smack_cipso_mapped);
1721 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1722
1723 return rc;
1724 }
1725
1726 /**
1727 * smk_write_mapped - write() for /smack/mapped
1728 * @file: file pointer, not actually used
1729 * @buf: where to get the data from
1730 * @count: bytes sent
1731 * @ppos: where to start
1732 *
1733 * Returns number of bytes written or error code, as appropriate
1734 */
smk_write_mapped(struct file * file,const char __user * buf,size_t count,loff_t * ppos)1735 static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1736 size_t count, loff_t *ppos)
1737 {
1738 struct smack_known *skp;
1739 char temp[80];
1740 int i;
1741
1742 if (!smack_privileged(CAP_MAC_ADMIN))
1743 return -EPERM;
1744
1745 if (count >= sizeof(temp) || count == 0)
1746 return -EINVAL;
1747
1748 if (copy_from_user(temp, buf, count) != 0)
1749 return -EFAULT;
1750
1751 temp[count] = '\0';
1752
1753 if (sscanf(temp, "%d", &i) != 1)
1754 return -EINVAL;
1755
1756 /*
1757 * Don't do anything if the value hasn't actually changed.
1758 * If it is changing reset the level on entries that were
1759 * set up to be mapped when they were created.
1760 */
1761 if (smack_cipso_mapped != i) {
1762 mutex_lock(&smack_known_lock);
1763 list_for_each_entry_rcu(skp, &smack_known_list, list)
1764 if (skp->smk_netlabel.attr.mls.lvl ==
1765 smack_cipso_mapped)
1766 skp->smk_netlabel.attr.mls.lvl = i;
1767 smack_cipso_mapped = i;
1768 mutex_unlock(&smack_known_lock);
1769 }
1770
1771 return count;
1772 }
1773
1774 static const struct file_operations smk_mapped_ops = {
1775 .read = smk_read_mapped,
1776 .write = smk_write_mapped,
1777 .llseek = default_llseek,
1778 };
1779
1780 /**
1781 * smk_read_ambient - read() for /smack/ambient
1782 * @filp: file pointer, not actually used
1783 * @buf: where to put the result
1784 * @cn: maximum to send along
1785 * @ppos: where to start
1786 *
1787 * Returns number of bytes read or error code, as appropriate
1788 */
smk_read_ambient(struct file * filp,char __user * buf,size_t cn,loff_t * ppos)1789 static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1790 size_t cn, loff_t *ppos)
1791 {
1792 ssize_t rc;
1793 int asize;
1794
1795 if (*ppos != 0)
1796 return 0;
1797 /*
1798 * Being careful to avoid a problem in the case where
1799 * smack_net_ambient gets changed in midstream.
1800 */
1801 mutex_lock(&smack_ambient_lock);
1802
1803 asize = strlen(smack_net_ambient->smk_known) + 1;
1804
1805 if (cn >= asize)
1806 rc = simple_read_from_buffer(buf, cn, ppos,
1807 smack_net_ambient->smk_known,
1808 asize);
1809 else
1810 rc = -EINVAL;
1811
1812 mutex_unlock(&smack_ambient_lock);
1813
1814 return rc;
1815 }
1816
1817 /**
1818 * smk_write_ambient - write() for /smack/ambient
1819 * @file: file pointer, not actually used
1820 * @buf: where to get the data from
1821 * @count: bytes sent
1822 * @ppos: where to start
1823 *
1824 * Returns number of bytes written or error code, as appropriate
1825 */
smk_write_ambient(struct file * file,const char __user * buf,size_t count,loff_t * ppos)1826 static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1827 size_t count, loff_t *ppos)
1828 {
1829 struct smack_known *skp;
1830 char *oldambient;
1831 char *data;
1832 int rc = count;
1833
1834 if (!smack_privileged(CAP_MAC_ADMIN))
1835 return -EPERM;
1836
1837 data = memdup_user_nul(buf, count);
1838 if (IS_ERR(data))
1839 return PTR_ERR(data);
1840
1841 skp = smk_import_entry(data, count);
1842 if (IS_ERR(skp)) {
1843 rc = PTR_ERR(skp);
1844 goto out;
1845 }
1846
1847 mutex_lock(&smack_ambient_lock);
1848
1849 oldambient = smack_net_ambient->smk_known;
1850 smack_net_ambient = skp;
1851 smk_unlbl_ambient(oldambient);
1852
1853 mutex_unlock(&smack_ambient_lock);
1854
1855 out:
1856 kfree(data);
1857 return rc;
1858 }
1859
1860 static const struct file_operations smk_ambient_ops = {
1861 .read = smk_read_ambient,
1862 .write = smk_write_ambient,
1863 .llseek = default_llseek,
1864 };
1865
1866 /*
1867 * Seq_file operations for /smack/onlycap
1868 */
onlycap_seq_start(struct seq_file * s,loff_t * pos)1869 static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1870 {
1871 return smk_seq_start(s, pos, &smack_onlycap_list);
1872 }
1873
onlycap_seq_next(struct seq_file * s,void * v,loff_t * pos)1874 static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1875 {
1876 return smk_seq_next(s, v, pos, &smack_onlycap_list);
1877 }
1878
onlycap_seq_show(struct seq_file * s,void * v)1879 static int onlycap_seq_show(struct seq_file *s, void *v)
1880 {
1881 struct list_head *list = v;
1882 struct smack_known_list_elem *sklep =
1883 list_entry_rcu(list, struct smack_known_list_elem, list);
1884
1885 seq_puts(s, sklep->smk_label->smk_known);
1886 seq_putc(s, ' ');
1887
1888 return 0;
1889 }
1890
1891 static const struct seq_operations onlycap_seq_ops = {
1892 .start = onlycap_seq_start,
1893 .next = onlycap_seq_next,
1894 .show = onlycap_seq_show,
1895 .stop = smk_seq_stop,
1896 };
1897
smk_open_onlycap(struct inode * inode,struct file * file)1898 static int smk_open_onlycap(struct inode *inode, struct file *file)
1899 {
1900 return seq_open(file, &onlycap_seq_ops);
1901 }
1902
1903 /**
1904 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1905 * The caller must hold appropriate mutex to prevent concurrent modifications
1906 * to the public list.
1907 * Private list is assumed to be not accessible to other threads yet.
1908 *
1909 * @public: public list
1910 * @private: private list
1911 */
smk_list_swap_rcu(struct list_head * public,struct list_head * private)1912 static void smk_list_swap_rcu(struct list_head *public,
1913 struct list_head *private)
1914 {
1915 struct list_head *first, *last;
1916
1917 if (list_empty(public)) {
1918 list_splice_init_rcu(private, public, synchronize_rcu);
1919 } else {
1920 /* Remember public list before replacing it */
1921 first = public->next;
1922 last = public->prev;
1923
1924 /* Publish private list in place of public in RCU-safe way */
1925 private->prev->next = public;
1926 private->next->prev = public;
1927 rcu_assign_pointer(public->next, private->next);
1928 public->prev = private->prev;
1929
1930 synchronize_rcu();
1931
1932 /* When all readers are done with the old public list,
1933 * attach it in place of private */
1934 private->next = first;
1935 private->prev = last;
1936 first->prev = private;
1937 last->next = private;
1938 }
1939 }
1940
1941 /**
1942 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1943 *
1944 * @data: the string to parse
1945 * @private: destination list
1946 *
1947 * Returns zero on success or error code, as appropriate
1948 */
smk_parse_label_list(char * data,struct list_head * list)1949 static int smk_parse_label_list(char *data, struct list_head *list)
1950 {
1951 char *tok;
1952 struct smack_known *skp;
1953 struct smack_known_list_elem *sklep;
1954
1955 while ((tok = strsep(&data, " ")) != NULL) {
1956 if (!*tok)
1957 continue;
1958
1959 skp = smk_import_entry(tok, 0);
1960 if (IS_ERR(skp))
1961 return PTR_ERR(skp);
1962
1963 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1964 if (sklep == NULL)
1965 return -ENOMEM;
1966
1967 sklep->smk_label = skp;
1968 list_add(&sklep->list, list);
1969 }
1970
1971 return 0;
1972 }
1973
1974 /**
1975 * smk_destroy_label_list - destroy a list of smack_known_list_elem
1976 * @head: header pointer of the list to destroy
1977 */
smk_destroy_label_list(struct list_head * list)1978 void smk_destroy_label_list(struct list_head *list)
1979 {
1980 struct smack_known_list_elem *sklep;
1981 struct smack_known_list_elem *sklep2;
1982
1983 list_for_each_entry_safe(sklep, sklep2, list, list)
1984 kfree(sklep);
1985
1986 INIT_LIST_HEAD(list);
1987 }
1988
1989 /**
1990 * smk_write_onlycap - write() for smackfs/onlycap
1991 * @file: file pointer, not actually used
1992 * @buf: where to get the data from
1993 * @count: bytes sent
1994 * @ppos: where to start
1995 *
1996 * Returns number of bytes written or error code, as appropriate
1997 */
smk_write_onlycap(struct file * file,const char __user * buf,size_t count,loff_t * ppos)1998 static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1999 size_t count, loff_t *ppos)
2000 {
2001 char *data;
2002 LIST_HEAD(list_tmp);
2003 int rc;
2004
2005 if (!smack_privileged(CAP_MAC_ADMIN))
2006 return -EPERM;
2007
2008 data = memdup_user_nul(buf, count);
2009 if (IS_ERR(data))
2010 return PTR_ERR(data);
2011
2012 rc = smk_parse_label_list(data, &list_tmp);
2013 kfree(data);
2014
2015 /*
2016 * Clear the smack_onlycap on invalid label errors. This means
2017 * that we can pass a null string to unset the onlycap value.
2018 *
2019 * Importing will also reject a label beginning with '-',
2020 * so "-usecapabilities" will also work.
2021 *
2022 * But do so only on invalid label, not on system errors.
2023 * The invalid label must be first to count as clearing attempt.
2024 */
2025 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2026 mutex_lock(&smack_onlycap_lock);
2027 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2028 mutex_unlock(&smack_onlycap_lock);
2029 rc = count;
2030 }
2031
2032 smk_destroy_label_list(&list_tmp);
2033
2034 return rc;
2035 }
2036
2037 static const struct file_operations smk_onlycap_ops = {
2038 .open = smk_open_onlycap,
2039 .read = seq_read,
2040 .write = smk_write_onlycap,
2041 .llseek = seq_lseek,
2042 .release = seq_release,
2043 };
2044
2045 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
2046 /**
2047 * smk_read_unconfined - read() for smackfs/unconfined
2048 * @filp: file pointer, not actually used
2049 * @buf: where to put the result
2050 * @cn: maximum to send along
2051 * @ppos: where to start
2052 *
2053 * Returns number of bytes read or error code, as appropriate
2054 */
smk_read_unconfined(struct file * filp,char __user * buf,size_t cn,loff_t * ppos)2055 static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2056 size_t cn, loff_t *ppos)
2057 {
2058 char *smack = "";
2059 ssize_t rc = -EINVAL;
2060 int asize;
2061
2062 if (*ppos != 0)
2063 return 0;
2064
2065 if (smack_unconfined != NULL)
2066 smack = smack_unconfined->smk_known;
2067
2068 asize = strlen(smack) + 1;
2069
2070 if (cn >= asize)
2071 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2072
2073 return rc;
2074 }
2075
2076 /**
2077 * smk_write_unconfined - write() for smackfs/unconfined
2078 * @file: file pointer, not actually used
2079 * @buf: where to get the data from
2080 * @count: bytes sent
2081 * @ppos: where to start
2082 *
2083 * Returns number of bytes written or error code, as appropriate
2084 */
smk_write_unconfined(struct file * file,const char __user * buf,size_t count,loff_t * ppos)2085 static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2086 size_t count, loff_t *ppos)
2087 {
2088 char *data;
2089 struct smack_known *skp;
2090 int rc = count;
2091
2092 if (!smack_privileged(CAP_MAC_ADMIN))
2093 return -EPERM;
2094
2095 data = memdup_user_nul(buf, count);
2096 if (IS_ERR(data))
2097 return PTR_ERR(data);
2098
2099 /*
2100 * Clear the smack_unconfined on invalid label errors. This means
2101 * that we can pass a null string to unset the unconfined value.
2102 *
2103 * Importing will also reject a label beginning with '-',
2104 * so "-confine" will also work.
2105 *
2106 * But do so only on invalid label, not on system errors.
2107 */
2108 skp = smk_import_entry(data, count);
2109 if (PTR_ERR(skp) == -EINVAL)
2110 skp = NULL;
2111 else if (IS_ERR(skp)) {
2112 rc = PTR_ERR(skp);
2113 goto freeout;
2114 }
2115
2116 smack_unconfined = skp;
2117
2118 freeout:
2119 kfree(data);
2120 return rc;
2121 }
2122
2123 static const struct file_operations smk_unconfined_ops = {
2124 .read = smk_read_unconfined,
2125 .write = smk_write_unconfined,
2126 .llseek = default_llseek,
2127 };
2128 #endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2129
2130 /**
2131 * smk_read_logging - read() for /smack/logging
2132 * @filp: file pointer, not actually used
2133 * @buf: where to put the result
2134 * @cn: maximum to send along
2135 * @ppos: where to start
2136 *
2137 * Returns number of bytes read or error code, as appropriate
2138 */
smk_read_logging(struct file * filp,char __user * buf,size_t count,loff_t * ppos)2139 static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2140 size_t count, loff_t *ppos)
2141 {
2142 char temp[32];
2143 ssize_t rc;
2144
2145 if (*ppos != 0)
2146 return 0;
2147
2148 sprintf(temp, "%d\n", log_policy);
2149 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2150 return rc;
2151 }
2152
2153 /**
2154 * smk_write_logging - write() for /smack/logging
2155 * @file: file pointer, not actually used
2156 * @buf: where to get the data from
2157 * @count: bytes sent
2158 * @ppos: where to start
2159 *
2160 * Returns number of bytes written or error code, as appropriate
2161 */
smk_write_logging(struct file * file,const char __user * buf,size_t count,loff_t * ppos)2162 static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2163 size_t count, loff_t *ppos)
2164 {
2165 char temp[32];
2166 int i;
2167
2168 if (!smack_privileged(CAP_MAC_ADMIN))
2169 return -EPERM;
2170
2171 if (count >= sizeof(temp) || count == 0)
2172 return -EINVAL;
2173
2174 if (copy_from_user(temp, buf, count) != 0)
2175 return -EFAULT;
2176
2177 temp[count] = '\0';
2178
2179 if (sscanf(temp, "%d", &i) != 1)
2180 return -EINVAL;
2181 if (i < 0 || i > 3)
2182 return -EINVAL;
2183 log_policy = i;
2184 return count;
2185 }
2186
2187
2188
2189 static const struct file_operations smk_logging_ops = {
2190 .read = smk_read_logging,
2191 .write = smk_write_logging,
2192 .llseek = default_llseek,
2193 };
2194
2195 /*
2196 * Seq_file read operations for /smack/load-self
2197 */
2198
load_self_seq_start(struct seq_file * s,loff_t * pos)2199 static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2200 {
2201 struct task_smack *tsp = smack_cred(current_cred());
2202
2203 return smk_seq_start(s, pos, &tsp->smk_rules);
2204 }
2205
load_self_seq_next(struct seq_file * s,void * v,loff_t * pos)2206 static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2207 {
2208 struct task_smack *tsp = smack_cred(current_cred());
2209
2210 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2211 }
2212
load_self_seq_show(struct seq_file * s,void * v)2213 static int load_self_seq_show(struct seq_file *s, void *v)
2214 {
2215 struct list_head *list = v;
2216 struct smack_rule *srp =
2217 list_entry_rcu(list, struct smack_rule, list);
2218
2219 smk_rule_show(s, srp, SMK_LABELLEN);
2220
2221 return 0;
2222 }
2223
2224 static const struct seq_operations load_self_seq_ops = {
2225 .start = load_self_seq_start,
2226 .next = load_self_seq_next,
2227 .show = load_self_seq_show,
2228 .stop = smk_seq_stop,
2229 };
2230
2231
2232 /**
2233 * smk_open_load_self - open() for /smack/load-self2
2234 * @inode: inode structure representing file
2235 * @file: "load" file pointer
2236 *
2237 * For reading, use load_seq_* seq_file reading operations.
2238 */
smk_open_load_self(struct inode * inode,struct file * file)2239 static int smk_open_load_self(struct inode *inode, struct file *file)
2240 {
2241 return seq_open(file, &load_self_seq_ops);
2242 }
2243
2244 /**
2245 * smk_write_load_self - write() for /smack/load-self
2246 * @file: file pointer, not actually used
2247 * @buf: where to get the data from
2248 * @count: bytes sent
2249 * @ppos: where to start - must be 0
2250 *
2251 */
smk_write_load_self(struct file * file,const char __user * buf,size_t count,loff_t * ppos)2252 static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2253 size_t count, loff_t *ppos)
2254 {
2255 struct task_smack *tsp = smack_cred(current_cred());
2256
2257 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2258 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2259 }
2260
2261 static const struct file_operations smk_load_self_ops = {
2262 .open = smk_open_load_self,
2263 .read = seq_read,
2264 .llseek = seq_lseek,
2265 .write = smk_write_load_self,
2266 .release = seq_release,
2267 };
2268
2269 /**
2270 * smk_user_access - handle access check transaction
2271 * @file: file pointer
2272 * @buf: data from user space
2273 * @count: bytes sent
2274 * @ppos: where to start - must be 0
2275 */
smk_user_access(struct file * file,const char __user * buf,size_t count,loff_t * ppos,int format)2276 static ssize_t smk_user_access(struct file *file, const char __user *buf,
2277 size_t count, loff_t *ppos, int format)
2278 {
2279 struct smack_parsed_rule rule;
2280 char *data;
2281 int res;
2282
2283 data = simple_transaction_get(file, buf, count);
2284 if (IS_ERR(data))
2285 return PTR_ERR(data);
2286
2287 if (format == SMK_FIXED24_FMT) {
2288 if (count < SMK_LOADLEN)
2289 return -EINVAL;
2290 res = smk_parse_rule(data, &rule, 0);
2291 } else {
2292 /*
2293 * simple_transaction_get() returns null-terminated data
2294 */
2295 res = smk_parse_long_rule(data, &rule, 0, 3);
2296 }
2297
2298 if (res >= 0)
2299 res = smk_access(rule.smk_subject, rule.smk_object,
2300 rule.smk_access1, NULL);
2301 else if (res != -ENOENT)
2302 return res;
2303
2304 /*
2305 * smk_access() can return a value > 0 in the "bringup" case.
2306 */
2307 data[0] = res >= 0 ? '1' : '0';
2308 data[1] = '\0';
2309
2310 simple_transaction_set(file, 2);
2311
2312 if (format == SMK_FIXED24_FMT)
2313 return SMK_LOADLEN;
2314 return count;
2315 }
2316
2317 /**
2318 * smk_write_access - handle access check transaction
2319 * @file: file pointer
2320 * @buf: data from user space
2321 * @count: bytes sent
2322 * @ppos: where to start - must be 0
2323 */
smk_write_access(struct file * file,const char __user * buf,size_t count,loff_t * ppos)2324 static ssize_t smk_write_access(struct file *file, const char __user *buf,
2325 size_t count, loff_t *ppos)
2326 {
2327 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2328 }
2329
2330 static const struct file_operations smk_access_ops = {
2331 .write = smk_write_access,
2332 .read = simple_transaction_read,
2333 .release = simple_transaction_release,
2334 .llseek = generic_file_llseek,
2335 };
2336
2337
2338 /*
2339 * Seq_file read operations for /smack/load2
2340 */
2341
load2_seq_show(struct seq_file * s,void * v)2342 static int load2_seq_show(struct seq_file *s, void *v)
2343 {
2344 struct list_head *list = v;
2345 struct smack_rule *srp;
2346 struct smack_known *skp =
2347 list_entry_rcu(list, struct smack_known, list);
2348
2349 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
2350 smk_rule_show(s, srp, SMK_LONGLABEL);
2351
2352 return 0;
2353 }
2354
2355 static const struct seq_operations load2_seq_ops = {
2356 .start = load2_seq_start,
2357 .next = load2_seq_next,
2358 .show = load2_seq_show,
2359 .stop = smk_seq_stop,
2360 };
2361
2362 /**
2363 * smk_open_load2 - open() for /smack/load2
2364 * @inode: inode structure representing file
2365 * @file: "load2" file pointer
2366 *
2367 * For reading, use load2_seq_* seq_file reading operations.
2368 */
smk_open_load2(struct inode * inode,struct file * file)2369 static int smk_open_load2(struct inode *inode, struct file *file)
2370 {
2371 return seq_open(file, &load2_seq_ops);
2372 }
2373
2374 /**
2375 * smk_write_load2 - write() for /smack/load2
2376 * @file: file pointer, not actually used
2377 * @buf: where to get the data from
2378 * @count: bytes sent
2379 * @ppos: where to start - must be 0
2380 *
2381 */
smk_write_load2(struct file * file,const char __user * buf,size_t count,loff_t * ppos)2382 static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2383 size_t count, loff_t *ppos)
2384 {
2385 /*
2386 * Must have privilege.
2387 */
2388 if (!smack_privileged(CAP_MAC_ADMIN))
2389 return -EPERM;
2390
2391 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2392 SMK_LONG_FMT);
2393 }
2394
2395 static const struct file_operations smk_load2_ops = {
2396 .open = smk_open_load2,
2397 .read = seq_read,
2398 .llseek = seq_lseek,
2399 .write = smk_write_load2,
2400 .release = seq_release,
2401 };
2402
2403 /*
2404 * Seq_file read operations for /smack/load-self2
2405 */
2406
load_self2_seq_start(struct seq_file * s,loff_t * pos)2407 static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2408 {
2409 struct task_smack *tsp = smack_cred(current_cred());
2410
2411 return smk_seq_start(s, pos, &tsp->smk_rules);
2412 }
2413
load_self2_seq_next(struct seq_file * s,void * v,loff_t * pos)2414 static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2415 {
2416 struct task_smack *tsp = smack_cred(current_cred());
2417
2418 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2419 }
2420
load_self2_seq_show(struct seq_file * s,void * v)2421 static int load_self2_seq_show(struct seq_file *s, void *v)
2422 {
2423 struct list_head *list = v;
2424 struct smack_rule *srp =
2425 list_entry_rcu(list, struct smack_rule, list);
2426
2427 smk_rule_show(s, srp, SMK_LONGLABEL);
2428
2429 return 0;
2430 }
2431
2432 static const struct seq_operations load_self2_seq_ops = {
2433 .start = load_self2_seq_start,
2434 .next = load_self2_seq_next,
2435 .show = load_self2_seq_show,
2436 .stop = smk_seq_stop,
2437 };
2438
2439 /**
2440 * smk_open_load_self2 - open() for /smack/load-self2
2441 * @inode: inode structure representing file
2442 * @file: "load" file pointer
2443 *
2444 * For reading, use load_seq_* seq_file reading operations.
2445 */
smk_open_load_self2(struct inode * inode,struct file * file)2446 static int smk_open_load_self2(struct inode *inode, struct file *file)
2447 {
2448 return seq_open(file, &load_self2_seq_ops);
2449 }
2450
2451 /**
2452 * smk_write_load_self2 - write() for /smack/load-self2
2453 * @file: file pointer, not actually used
2454 * @buf: where to get the data from
2455 * @count: bytes sent
2456 * @ppos: where to start - must be 0
2457 *
2458 */
smk_write_load_self2(struct file * file,const char __user * buf,size_t count,loff_t * ppos)2459 static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2460 size_t count, loff_t *ppos)
2461 {
2462 struct task_smack *tsp = smack_cred(current_cred());
2463
2464 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2465 &tsp->smk_rules_lock, SMK_LONG_FMT);
2466 }
2467
2468 static const struct file_operations smk_load_self2_ops = {
2469 .open = smk_open_load_self2,
2470 .read = seq_read,
2471 .llseek = seq_lseek,
2472 .write = smk_write_load_self2,
2473 .release = seq_release,
2474 };
2475
2476 /**
2477 * smk_write_access2 - handle access check transaction
2478 * @file: file pointer
2479 * @buf: data from user space
2480 * @count: bytes sent
2481 * @ppos: where to start - must be 0
2482 */
smk_write_access2(struct file * file,const char __user * buf,size_t count,loff_t * ppos)2483 static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2484 size_t count, loff_t *ppos)
2485 {
2486 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2487 }
2488
2489 static const struct file_operations smk_access2_ops = {
2490 .write = smk_write_access2,
2491 .read = simple_transaction_read,
2492 .release = simple_transaction_release,
2493 .llseek = generic_file_llseek,
2494 };
2495
2496 /**
2497 * smk_write_revoke_subj - write() for /smack/revoke-subject
2498 * @file: file pointer
2499 * @buf: data from user space
2500 * @count: bytes sent
2501 * @ppos: where to start - must be 0
2502 */
smk_write_revoke_subj(struct file * file,const char __user * buf,size_t count,loff_t * ppos)2503 static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2504 size_t count, loff_t *ppos)
2505 {
2506 char *data;
2507 const char *cp;
2508 struct smack_known *skp;
2509 struct smack_rule *sp;
2510 struct list_head *rule_list;
2511 struct mutex *rule_lock;
2512 int rc = count;
2513
2514 if (*ppos != 0)
2515 return -EINVAL;
2516
2517 if (!smack_privileged(CAP_MAC_ADMIN))
2518 return -EPERM;
2519
2520 if (count == 0 || count > SMK_LONGLABEL)
2521 return -EINVAL;
2522
2523 data = memdup_user(buf, count);
2524 if (IS_ERR(data))
2525 return PTR_ERR(data);
2526
2527 cp = smk_parse_smack(data, count);
2528 if (IS_ERR(cp)) {
2529 rc = PTR_ERR(cp);
2530 goto out_data;
2531 }
2532
2533 skp = smk_find_entry(cp);
2534 if (skp == NULL)
2535 goto out_cp;
2536
2537 rule_list = &skp->smk_rules;
2538 rule_lock = &skp->smk_rules_lock;
2539
2540 mutex_lock(rule_lock);
2541
2542 list_for_each_entry_rcu(sp, rule_list, list)
2543 sp->smk_access = 0;
2544
2545 mutex_unlock(rule_lock);
2546
2547 out_cp:
2548 kfree(cp);
2549 out_data:
2550 kfree(data);
2551
2552 return rc;
2553 }
2554
2555 static const struct file_operations smk_revoke_subj_ops = {
2556 .write = smk_write_revoke_subj,
2557 .read = simple_transaction_read,
2558 .release = simple_transaction_release,
2559 .llseek = generic_file_llseek,
2560 };
2561
2562 /**
2563 * smk_init_sysfs - initialize /sys/fs/smackfs
2564 *
2565 */
smk_init_sysfs(void)2566 static int smk_init_sysfs(void)
2567 {
2568 return sysfs_create_mount_point(fs_kobj, "smackfs");
2569 }
2570
2571 /**
2572 * smk_write_change_rule - write() for /smack/change-rule
2573 * @file: file pointer
2574 * @buf: data from user space
2575 * @count: bytes sent
2576 * @ppos: where to start - must be 0
2577 */
smk_write_change_rule(struct file * file,const char __user * buf,size_t count,loff_t * ppos)2578 static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2579 size_t count, loff_t *ppos)
2580 {
2581 /*
2582 * Must have privilege.
2583 */
2584 if (!smack_privileged(CAP_MAC_ADMIN))
2585 return -EPERM;
2586
2587 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2588 SMK_CHANGE_FMT);
2589 }
2590
2591 static const struct file_operations smk_change_rule_ops = {
2592 .write = smk_write_change_rule,
2593 .read = simple_transaction_read,
2594 .release = simple_transaction_release,
2595 .llseek = generic_file_llseek,
2596 };
2597
2598 /**
2599 * smk_read_syslog - read() for smackfs/syslog
2600 * @filp: file pointer, not actually used
2601 * @buf: where to put the result
2602 * @cn: maximum to send along
2603 * @ppos: where to start
2604 *
2605 * Returns number of bytes read or error code, as appropriate
2606 */
smk_read_syslog(struct file * filp,char __user * buf,size_t cn,loff_t * ppos)2607 static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2608 size_t cn, loff_t *ppos)
2609 {
2610 struct smack_known *skp;
2611 ssize_t rc = -EINVAL;
2612 int asize;
2613
2614 if (*ppos != 0)
2615 return 0;
2616
2617 if (smack_syslog_label == NULL)
2618 skp = &smack_known_star;
2619 else
2620 skp = smack_syslog_label;
2621
2622 asize = strlen(skp->smk_known) + 1;
2623
2624 if (cn >= asize)
2625 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2626 asize);
2627
2628 return rc;
2629 }
2630
2631 /**
2632 * smk_write_syslog - write() for smackfs/syslog
2633 * @file: file pointer, not actually used
2634 * @buf: where to get the data from
2635 * @count: bytes sent
2636 * @ppos: where to start
2637 *
2638 * Returns number of bytes written or error code, as appropriate
2639 */
smk_write_syslog(struct file * file,const char __user * buf,size_t count,loff_t * ppos)2640 static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2641 size_t count, loff_t *ppos)
2642 {
2643 char *data;
2644 struct smack_known *skp;
2645 int rc = count;
2646
2647 if (!smack_privileged(CAP_MAC_ADMIN))
2648 return -EPERM;
2649
2650 data = memdup_user_nul(buf, count);
2651 if (IS_ERR(data))
2652 return PTR_ERR(data);
2653
2654 skp = smk_import_entry(data, count);
2655 if (IS_ERR(skp))
2656 rc = PTR_ERR(skp);
2657 else
2658 smack_syslog_label = skp;
2659
2660 kfree(data);
2661 return rc;
2662 }
2663
2664 static const struct file_operations smk_syslog_ops = {
2665 .read = smk_read_syslog,
2666 .write = smk_write_syslog,
2667 .llseek = default_llseek,
2668 };
2669
2670 /*
2671 * Seq_file read operations for /smack/relabel-self
2672 */
2673
relabel_self_seq_start(struct seq_file * s,loff_t * pos)2674 static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2675 {
2676 struct task_smack *tsp = smack_cred(current_cred());
2677
2678 return smk_seq_start(s, pos, &tsp->smk_relabel);
2679 }
2680
relabel_self_seq_next(struct seq_file * s,void * v,loff_t * pos)2681 static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2682 {
2683 struct task_smack *tsp = smack_cred(current_cred());
2684
2685 return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2686 }
2687
relabel_self_seq_show(struct seq_file * s,void * v)2688 static int relabel_self_seq_show(struct seq_file *s, void *v)
2689 {
2690 struct list_head *list = v;
2691 struct smack_known_list_elem *sklep =
2692 list_entry(list, struct smack_known_list_elem, list);
2693
2694 seq_puts(s, sklep->smk_label->smk_known);
2695 seq_putc(s, ' ');
2696
2697 return 0;
2698 }
2699
2700 static const struct seq_operations relabel_self_seq_ops = {
2701 .start = relabel_self_seq_start,
2702 .next = relabel_self_seq_next,
2703 .show = relabel_self_seq_show,
2704 .stop = smk_seq_stop,
2705 };
2706
2707 /**
2708 * smk_open_relabel_self - open() for /smack/relabel-self
2709 * @inode: inode structure representing file
2710 * @file: "relabel-self" file pointer
2711 *
2712 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2713 * file_operations
2714 */
smk_open_relabel_self(struct inode * inode,struct file * file)2715 static int smk_open_relabel_self(struct inode *inode, struct file *file)
2716 {
2717 return seq_open(file, &relabel_self_seq_ops);
2718 }
2719
2720 /**
2721 * smk_write_relabel_self - write() for /smack/relabel-self
2722 * @file: file pointer, not actually used
2723 * @buf: where to get the data from
2724 * @count: bytes sent
2725 * @ppos: where to start - must be 0
2726 *
2727 */
smk_write_relabel_self(struct file * file,const char __user * buf,size_t count,loff_t * ppos)2728 static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2729 size_t count, loff_t *ppos)
2730 {
2731 char *data;
2732 int rc;
2733 LIST_HEAD(list_tmp);
2734
2735 /*
2736 * Must have privilege.
2737 */
2738 if (!smack_privileged(CAP_MAC_ADMIN))
2739 return -EPERM;
2740
2741 /*
2742 * Enough data must be present.
2743 */
2744 if (*ppos != 0)
2745 return -EINVAL;
2746
2747 data = memdup_user_nul(buf, count);
2748 if (IS_ERR(data))
2749 return PTR_ERR(data);
2750
2751 rc = smk_parse_label_list(data, &list_tmp);
2752 kfree(data);
2753
2754 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2755 struct cred *new;
2756 struct task_smack *tsp;
2757
2758 new = prepare_creds();
2759 if (!new) {
2760 rc = -ENOMEM;
2761 goto out;
2762 }
2763 tsp = smack_cred(new);
2764 smk_destroy_label_list(&tsp->smk_relabel);
2765 list_splice(&list_tmp, &tsp->smk_relabel);
2766 commit_creds(new);
2767 return count;
2768 }
2769 out:
2770 smk_destroy_label_list(&list_tmp);
2771 return rc;
2772 }
2773
2774 static const struct file_operations smk_relabel_self_ops = {
2775 .open = smk_open_relabel_self,
2776 .read = seq_read,
2777 .llseek = seq_lseek,
2778 .write = smk_write_relabel_self,
2779 .release = seq_release,
2780 };
2781
2782 /**
2783 * smk_read_ptrace - read() for /smack/ptrace
2784 * @filp: file pointer, not actually used
2785 * @buf: where to put the result
2786 * @count: maximum to send along
2787 * @ppos: where to start
2788 *
2789 * Returns number of bytes read or error code, as appropriate
2790 */
smk_read_ptrace(struct file * filp,char __user * buf,size_t count,loff_t * ppos)2791 static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2792 size_t count, loff_t *ppos)
2793 {
2794 char temp[32];
2795 ssize_t rc;
2796
2797 if (*ppos != 0)
2798 return 0;
2799
2800 sprintf(temp, "%d\n", smack_ptrace_rule);
2801 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2802 return rc;
2803 }
2804
2805 /**
2806 * smk_write_ptrace - write() for /smack/ptrace
2807 * @file: file pointer
2808 * @buf: data from user space
2809 * @count: bytes sent
2810 * @ppos: where to start - must be 0
2811 */
smk_write_ptrace(struct file * file,const char __user * buf,size_t count,loff_t * ppos)2812 static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2813 size_t count, loff_t *ppos)
2814 {
2815 char temp[32];
2816 int i;
2817
2818 if (!smack_privileged(CAP_MAC_ADMIN))
2819 return -EPERM;
2820
2821 if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2822 return -EINVAL;
2823
2824 if (copy_from_user(temp, buf, count) != 0)
2825 return -EFAULT;
2826
2827 temp[count] = '\0';
2828
2829 if (sscanf(temp, "%d", &i) != 1)
2830 return -EINVAL;
2831 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2832 return -EINVAL;
2833 smack_ptrace_rule = i;
2834
2835 return count;
2836 }
2837
2838 static const struct file_operations smk_ptrace_ops = {
2839 .write = smk_write_ptrace,
2840 .read = smk_read_ptrace,
2841 .llseek = default_llseek,
2842 };
2843
2844 /**
2845 * smk_fill_super - fill the smackfs superblock
2846 * @sb: the empty superblock
2847 * @fc: 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 */
smk_fill_super(struct super_block * sb,struct fs_context * fc)2853 static int smk_fill_super(struct super_block *sb, struct fs_context *fc)
2854 {
2855 int rc;
2856
2857 static const struct tree_descr smack_files[] = {
2858 [SMK_LOAD] = {
2859 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2860 [SMK_CIPSO] = {
2861 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2862 [SMK_DOI] = {
2863 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2864 [SMK_DIRECT] = {
2865 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2866 [SMK_AMBIENT] = {
2867 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2868 [SMK_NET4ADDR] = {
2869 "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2870 [SMK_ONLYCAP] = {
2871 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2872 [SMK_LOGGING] = {
2873 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2874 [SMK_LOAD_SELF] = {
2875 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2876 [SMK_ACCESSES] = {
2877 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2878 [SMK_MAPPED] = {
2879 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2880 [SMK_LOAD2] = {
2881 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2882 [SMK_LOAD_SELF2] = {
2883 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2884 [SMK_ACCESS2] = {
2885 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2886 [SMK_CIPSO2] = {
2887 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2888 [SMK_REVOKE_SUBJ] = {
2889 "revoke-subject", &smk_revoke_subj_ops,
2890 S_IRUGO|S_IWUSR},
2891 [SMK_CHANGE_RULE] = {
2892 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2893 [SMK_SYSLOG] = {
2894 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2895 [SMK_PTRACE] = {
2896 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2897 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
2898 [SMK_UNCONFINED] = {
2899 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2900 #endif
2901 #if IS_ENABLED(CONFIG_IPV6)
2902 [SMK_NET6ADDR] = {
2903 "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2904 #endif /* CONFIG_IPV6 */
2905 [SMK_RELABEL_SELF] = {
2906 "relabel-self", &smk_relabel_self_ops,
2907 S_IRUGO|S_IWUGO},
2908 /* last one */
2909 {""}
2910 };
2911
2912 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2913 if (rc != 0) {
2914 printk(KERN_ERR "%s failed %d while creating inodes\n",
2915 __func__, rc);
2916 return rc;
2917 }
2918
2919 return 0;
2920 }
2921
2922 /**
2923 * smk_get_tree - get the smackfs superblock
2924 * @fc: The mount context, including any options
2925 *
2926 * Just passes everything along.
2927 *
2928 * Returns what the lower level code does.
2929 */
smk_get_tree(struct fs_context * fc)2930 static int smk_get_tree(struct fs_context *fc)
2931 {
2932 return get_tree_single(fc, smk_fill_super);
2933 }
2934
2935 static const struct fs_context_operations smk_context_ops = {
2936 .get_tree = smk_get_tree,
2937 };
2938
2939 /**
2940 * smk_init_fs_context - Initialise a filesystem context for smackfs
2941 * @fc: The blank mount context
2942 */
smk_init_fs_context(struct fs_context * fc)2943 static int smk_init_fs_context(struct fs_context *fc)
2944 {
2945 fc->ops = &smk_context_ops;
2946 return 0;
2947 }
2948
2949 static struct file_system_type smk_fs_type = {
2950 .name = "smackfs",
2951 .init_fs_context = smk_init_fs_context,
2952 .kill_sb = kill_litter_super,
2953 };
2954
2955 static struct vfsmount *smackfs_mount;
2956
2957 /**
2958 * init_smk_fs - get the smackfs superblock
2959 *
2960 * register the smackfs
2961 *
2962 * Do not register smackfs if Smack wasn't enabled
2963 * on boot. We can not put this method normally under the
2964 * smack_init() code path since the security subsystem get
2965 * initialized before the vfs caches.
2966 *
2967 * Returns true if we were not chosen on boot or if
2968 * we were chosen and filesystem registration succeeded.
2969 */
init_smk_fs(void)2970 static int __init init_smk_fs(void)
2971 {
2972 int err;
2973 int rc;
2974
2975 if (smack_enabled == 0)
2976 return 0;
2977
2978 err = smk_init_sysfs();
2979 if (err)
2980 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
2981
2982 err = register_filesystem(&smk_fs_type);
2983 if (!err) {
2984 smackfs_mount = kern_mount(&smk_fs_type);
2985 if (IS_ERR(smackfs_mount)) {
2986 printk(KERN_ERR "smackfs: could not mount!\n");
2987 err = PTR_ERR(smackfs_mount);
2988 smackfs_mount = NULL;
2989 }
2990 }
2991
2992 smk_cipso_doi();
2993 smk_unlbl_ambient(NULL);
2994
2995 rc = smack_populate_secattr(&smack_known_floor);
2996 if (err == 0 && rc < 0)
2997 err = rc;
2998 rc = smack_populate_secattr(&smack_known_hat);
2999 if (err == 0 && rc < 0)
3000 err = rc;
3001 rc = smack_populate_secattr(&smack_known_huh);
3002 if (err == 0 && rc < 0)
3003 err = rc;
3004 rc = smack_populate_secattr(&smack_known_star);
3005 if (err == 0 && rc < 0)
3006 err = rc;
3007 rc = smack_populate_secattr(&smack_known_web);
3008 if (err == 0 && rc < 0)
3009 err = rc;
3010
3011 return err;
3012 }
3013
3014 __initcall(init_smk_fs);
3015
