blob: 8e42800878f468912c56cece9336e7c8c6bfa727 [file] [log] [blame]
Casey Schauflere114e472008-02-04 22:29:50 -08001/*
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>
Casey Schaufler6d3dc072008-12-31 12:54:12 -050023#include <net/net_namespace.h>
Casey Schauflere114e472008-02-04 22:29:50 -080024#include <net/netlabel.h>
25#include <net/cipso_ipv4.h>
26#include <linux/seq_file.h>
27#include <linux/ctype.h>
Casey Schaufler4bc87e62008-02-15 15:24:25 -080028#include <linux/audit.h>
Casey Schauflere114e472008-02-04 22:29:50 -080029#include "smack.h"
30
31/*
32 * smackfs pseudo filesystem.
33 */
34
35enum smk_inos {
36 SMK_ROOT_INO = 2,
37 SMK_LOAD = 3, /* load policy */
38 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
39 SMK_DOI = 5, /* CIPSO DOI */
40 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
41 SMK_AMBIENT = 7, /* internet ambient label */
Casey Schaufler6d3dc072008-12-31 12:54:12 -050042 SMK_NETLBLADDR = 8, /* single label hosts */
Casey Schaufler15446232008-07-30 15:37:11 -070043 SMK_ONLYCAP = 9, /* the only "capable" label */
Casey Schauflere114e472008-02-04 22:29:50 -080044};
45
46/*
47 * List locks
48 */
49static DEFINE_MUTEX(smack_list_lock);
50static DEFINE_MUTEX(smack_cipso_lock);
Casey Schaufler4bc87e62008-02-15 15:24:25 -080051static DEFINE_MUTEX(smack_ambient_lock);
Casey Schaufler6d3dc072008-12-31 12:54:12 -050052static DEFINE_MUTEX(smk_netlbladdr_lock);
Casey Schauflere114e472008-02-04 22:29:50 -080053
54/*
55 * This is the "ambient" label for network traffic.
56 * If it isn't somehow marked, use this.
57 * It can be reset via smackfs/ambient
58 */
59char *smack_net_ambient = smack_known_floor.smk_known;
60
61/*
Casey Schauflere114e472008-02-04 22:29:50 -080062 * This is the level in a CIPSO header that indicates a
63 * smack label is contained directly in the category set.
64 * It can be reset via smackfs/direct
65 */
66int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
67
Casey Schaufler15446232008-07-30 15:37:11 -070068/*
69 * Unless a process is running with this label even
70 * having CAP_MAC_OVERRIDE isn't enough to grant
71 * privilege to violate MAC policy. If no label is
72 * designated (the NULL case) capabilities apply to
73 * everyone. It is expected that the hat (^) label
74 * will be used if any label is used.
75 */
76char *smack_onlycap;
77
Casey Schaufler6d3dc072008-12-31 12:54:12 -050078/*
79 * Certain IP addresses may be designated as single label hosts.
80 * Packets are sent there unlabeled, but only from tasks that
81 * can write to the specified label.
82 */
83struct smk_netlbladdr *smack_netlbladdrs;
84
Casey Schauflere114e472008-02-04 22:29:50 -080085static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
86struct smk_list_entry *smack_list;
87
88#define SEQ_READ_FINISHED 1
89
90/*
Casey Schauflere114e472008-02-04 22:29:50 -080091 * Values for parsing cipso rules
92 * SMK_DIGITLEN: Length of a digit field in a rule.
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -070093 * SMK_CIPSOMIN: Minimum possible cipso rule length.
94 * SMK_CIPSOMAX: Maximum possible cipso rule length.
Casey Schauflere114e472008-02-04 22:29:50 -080095 */
96#define SMK_DIGITLEN 4
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -070097#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
98#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
99
100/*
101 * Values for parsing MAC rules
102 * SMK_ACCESS: Maximum possible combination of access permissions
103 * SMK_ACCESSLEN: Maximum length for a rule access field
104 * SMK_LOADLEN: Smack rule length
105 */
106#define SMK_ACCESS "rwxa"
107#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
108#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
109
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500110/**
111 * smk_netlabel_audit_set - fill a netlbl_audit struct
112 * @nap: structure to fill
113 */
114static void smk_netlabel_audit_set(struct netlbl_audit *nap)
115{
116 nap->loginuid = audit_get_loginuid(current);
117 nap->sessionid = audit_get_sessionid(current);
118 nap->secid = smack_to_secid(current_security());
119}
120
121/*
122 * Values for parsing single label host rules
123 * "1.2.3.4 X"
124 * "192.168.138.129/32 abcdefghijklmnopqrstuvw"
125 */
126#define SMK_NETLBLADDRMIN 9
127#define SMK_NETLBLADDRMAX 42
Casey Schauflere114e472008-02-04 22:29:50 -0800128
129/*
130 * Seq_file read operations for /smack/load
131 */
132
133static void *load_seq_start(struct seq_file *s, loff_t *pos)
134{
135 if (*pos == SEQ_READ_FINISHED)
136 return NULL;
137
138 return smack_list;
139}
140
141static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
142{
143 struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next;
144
145 if (skp == NULL)
146 *pos = SEQ_READ_FINISHED;
147
148 return skp;
149}
150
151static int load_seq_show(struct seq_file *s, void *v)
152{
153 struct smk_list_entry *slp = (struct smk_list_entry *) v;
154 struct smack_rule *srp = &slp->smk_rule;
155
156 seq_printf(s, "%s %s", (char *)srp->smk_subject,
157 (char *)srp->smk_object);
158
159 seq_putc(s, ' ');
160
161 if (srp->smk_access & MAY_READ)
162 seq_putc(s, 'r');
163 if (srp->smk_access & MAY_WRITE)
164 seq_putc(s, 'w');
165 if (srp->smk_access & MAY_EXEC)
166 seq_putc(s, 'x');
167 if (srp->smk_access & MAY_APPEND)
168 seq_putc(s, 'a');
169 if (srp->smk_access == 0)
170 seq_putc(s, '-');
171
172 seq_putc(s, '\n');
173
174 return 0;
175}
176
177static void load_seq_stop(struct seq_file *s, void *v)
178{
179 /* No-op */
180}
181
182static struct seq_operations load_seq_ops = {
183 .start = load_seq_start,
184 .next = load_seq_next,
185 .show = load_seq_show,
186 .stop = load_seq_stop,
187};
188
189/**
190 * smk_open_load - open() for /smack/load
191 * @inode: inode structure representing file
192 * @file: "load" file pointer
193 *
194 * For reading, use load_seq_* seq_file reading operations.
195 */
196static int smk_open_load(struct inode *inode, struct file *file)
197{
Ahmed S. Darwishcb622bb2008-03-24 12:29:49 -0700198 return seq_open(file, &load_seq_ops);
Casey Schauflere114e472008-02-04 22:29:50 -0800199}
200
201/**
202 * smk_set_access - add a rule to the rule list
203 * @srp: the new rule to add
204 *
205 * Looks through the current subject/object/access list for
206 * the subject/object pair and replaces the access that was
207 * there. If the pair isn't found add it with the specified
208 * access.
Sergio Luis81ea7142008-12-22 01:16:15 -0300209 *
210 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
211 * during the allocation of the new pair to add.
Casey Schauflere114e472008-02-04 22:29:50 -0800212 */
Sergio Luis81ea7142008-12-22 01:16:15 -0300213static int smk_set_access(struct smack_rule *srp)
Casey Schauflere114e472008-02-04 22:29:50 -0800214{
215 struct smk_list_entry *sp;
216 struct smk_list_entry *newp;
Sergio Luis81ea7142008-12-22 01:16:15 -0300217 int ret = 0;
Casey Schauflere114e472008-02-04 22:29:50 -0800218
219 mutex_lock(&smack_list_lock);
220
221 for (sp = smack_list; sp != NULL; sp = sp->smk_next)
222 if (sp->smk_rule.smk_subject == srp->smk_subject &&
223 sp->smk_rule.smk_object == srp->smk_object) {
224 sp->smk_rule.smk_access = srp->smk_access;
225 break;
226 }
227
228 if (sp == NULL) {
229 newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL);
Sergio Luis81ea7142008-12-22 01:16:15 -0300230 if (newp == NULL) {
231 ret = -ENOMEM;
232 goto out;
233 }
234
Casey Schauflere114e472008-02-04 22:29:50 -0800235 newp->smk_rule = *srp;
236 newp->smk_next = smack_list;
237 smack_list = newp;
238 }
239
Sergio Luis81ea7142008-12-22 01:16:15 -0300240out:
Casey Schauflere114e472008-02-04 22:29:50 -0800241 mutex_unlock(&smack_list_lock);
242
Sergio Luis81ea7142008-12-22 01:16:15 -0300243 return ret;
Casey Schauflere114e472008-02-04 22:29:50 -0800244}
245
246/**
247 * smk_write_load - write() for /smack/load
248 * @filp: file pointer, not actually used
249 * @buf: where to get the data from
250 * @count: bytes sent
251 * @ppos: where to start - must be 0
252 *
253 * Get one smack access rule from above.
254 * The format is exactly:
255 * char subject[SMK_LABELLEN]
256 * char object[SMK_LABELLEN]
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -0700257 * char access[SMK_ACCESSLEN]
Casey Schauflere114e472008-02-04 22:29:50 -0800258 *
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -0700259 * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes.
Casey Schauflere114e472008-02-04 22:29:50 -0800260 */
Casey Schauflere114e472008-02-04 22:29:50 -0800261static ssize_t smk_write_load(struct file *file, const char __user *buf,
262 size_t count, loff_t *ppos)
263{
264 struct smack_rule rule;
265 char *data;
266 int rc = -EINVAL;
267
268 /*
269 * Must have privilege.
270 * No partial writes.
271 * Enough data must be present.
272 */
273 if (!capable(CAP_MAC_ADMIN))
274 return -EPERM;
275 if (*ppos != 0)
276 return -EINVAL;
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -0700277 if (count != SMK_LOADLEN)
Casey Schauflere114e472008-02-04 22:29:50 -0800278 return -EINVAL;
279
280 data = kzalloc(count, GFP_KERNEL);
281 if (data == NULL)
282 return -ENOMEM;
283
284 if (copy_from_user(data, buf, count) != 0) {
285 rc = -EFAULT;
286 goto out;
287 }
288
289 rule.smk_subject = smk_import(data, 0);
290 if (rule.smk_subject == NULL)
291 goto out;
292
293 rule.smk_object = smk_import(data + SMK_LABELLEN, 0);
294 if (rule.smk_object == NULL)
295 goto out;
296
297 rule.smk_access = 0;
298
299 switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
300 case '-':
301 break;
302 case 'r':
303 case 'R':
304 rule.smk_access |= MAY_READ;
305 break;
306 default:
307 goto out;
308 }
309
310 switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
311 case '-':
312 break;
313 case 'w':
314 case 'W':
315 rule.smk_access |= MAY_WRITE;
316 break;
317 default:
318 goto out;
319 }
320
321 switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
322 case '-':
323 break;
324 case 'x':
325 case 'X':
326 rule.smk_access |= MAY_EXEC;
327 break;
328 default:
329 goto out;
330 }
331
332 switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
333 case '-':
334 break;
335 case 'a':
336 case 'A':
Casey Schaufler152a6492009-01-27 19:56:30 -0800337 rule.smk_access |= MAY_APPEND;
Casey Schauflere114e472008-02-04 22:29:50 -0800338 break;
339 default:
340 goto out;
341 }
342
Sergio Luis81ea7142008-12-22 01:16:15 -0300343 rc = smk_set_access(&rule);
344
345 if (!rc)
346 rc = count;
Casey Schauflere114e472008-02-04 22:29:50 -0800347
348out:
349 kfree(data);
350 return rc;
351}
352
353static const struct file_operations smk_load_ops = {
354 .open = smk_open_load,
355 .read = seq_read,
356 .llseek = seq_lseek,
357 .write = smk_write_load,
Ahmed S. Darwishcb622bb2008-03-24 12:29:49 -0700358 .release = seq_release,
Casey Schauflere114e472008-02-04 22:29:50 -0800359};
360
361/**
362 * smk_cipso_doi - initialize the CIPSO domain
363 */
Casey Schaufler30aa4fa2008-04-28 02:13:43 -0700364static void smk_cipso_doi(void)
Casey Schauflere114e472008-02-04 22:29:50 -0800365{
366 int rc;
367 struct cipso_v4_doi *doip;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500368 struct netlbl_audit nai;
Casey Schauflere114e472008-02-04 22:29:50 -0800369
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500370 smk_netlabel_audit_set(&nai);
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800371
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500372 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
Casey Schauflere114e472008-02-04 22:29:50 -0800373 if (rc != 0)
374 printk(KERN_WARNING "%s:%d remove rc = %d\n",
375 __func__, __LINE__, rc);
376
377 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
378 if (doip == NULL)
379 panic("smack: Failed to initialize cipso DOI.\n");
380 doip->map.std = NULL;
381 doip->doi = smk_cipso_doi_value;
382 doip->type = CIPSO_V4_MAP_PASS;
383 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
384 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
385 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
386
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500387 rc = netlbl_cfg_cipsov4_add(doip, &nai);
Paul Mooreb1edeb12008-10-10 10:16:31 -0400388 if (rc != 0) {
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500389 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
Casey Schauflere114e472008-02-04 22:29:50 -0800390 __func__, __LINE__, rc);
Paul Mooreb1edeb12008-10-10 10:16:31 -0400391 kfree(doip);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500392 return;
393 }
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500394 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500395 if (rc != 0) {
396 printk(KERN_WARNING "%s:%d map add rc = %d\n",
397 __func__, __LINE__, rc);
398 kfree(doip);
399 return;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400400 }
Casey Schauflere114e472008-02-04 22:29:50 -0800401}
402
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800403/**
404 * smk_unlbl_ambient - initialize the unlabeled domain
405 */
Casey Schaufler30aa4fa2008-04-28 02:13:43 -0700406static void smk_unlbl_ambient(char *oldambient)
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800407{
408 int rc;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500409 struct netlbl_audit nai;
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800410
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500411 smk_netlabel_audit_set(&nai);
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800412
413 if (oldambient != NULL) {
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500414 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800415 if (rc != 0)
416 printk(KERN_WARNING "%s:%d remove rc = %d\n",
417 __func__, __LINE__, rc);
418 }
419
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500420 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET,
421 NULL, NULL, &nai);
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800422 if (rc != 0)
423 printk(KERN_WARNING "%s:%d add rc = %d\n",
424 __func__, __LINE__, rc);
425}
426
Casey Schauflere114e472008-02-04 22:29:50 -0800427/*
428 * Seq_file read operations for /smack/cipso
429 */
430
431static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
432{
433 if (*pos == SEQ_READ_FINISHED)
434 return NULL;
435
436 return smack_known;
437}
438
439static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
440{
441 struct smack_known *skp = ((struct smack_known *) v)->smk_next;
442
443 /*
444 * Omit labels with no associated cipso value
445 */
446 while (skp != NULL && !skp->smk_cipso)
447 skp = skp->smk_next;
448
449 if (skp == NULL)
450 *pos = SEQ_READ_FINISHED;
451
452 return skp;
453}
454
455/*
456 * Print cipso labels in format:
457 * label level[/cat[,cat]]
458 */
459static int cipso_seq_show(struct seq_file *s, void *v)
460{
461 struct smack_known *skp = (struct smack_known *) v;
462 struct smack_cipso *scp = skp->smk_cipso;
463 char *cbp;
464 char sep = '/';
465 int cat = 1;
466 int i;
467 unsigned char m;
468
469 if (scp == NULL)
470 return 0;
471
472 seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level);
473
474 cbp = scp->smk_catset;
475 for (i = 0; i < SMK_LABELLEN; i++)
476 for (m = 0x80; m != 0; m >>= 1) {
477 if (m & cbp[i]) {
478 seq_printf(s, "%c%d", sep, cat);
479 sep = ',';
480 }
481 cat++;
482 }
483
484 seq_putc(s, '\n');
485
486 return 0;
487}
488
489static void cipso_seq_stop(struct seq_file *s, void *v)
490{
491 /* No-op */
492}
493
494static struct seq_operations cipso_seq_ops = {
495 .start = cipso_seq_start,
496 .stop = cipso_seq_stop,
497 .next = cipso_seq_next,
498 .show = cipso_seq_show,
499};
500
501/**
502 * smk_open_cipso - open() for /smack/cipso
503 * @inode: inode structure representing file
504 * @file: "cipso" file pointer
505 *
506 * Connect our cipso_seq_* operations with /smack/cipso
507 * file_operations
508 */
509static int smk_open_cipso(struct inode *inode, struct file *file)
510{
511 return seq_open(file, &cipso_seq_ops);
512}
513
514/**
515 * smk_write_cipso - write() for /smack/cipso
516 * @filp: file pointer, not actually used
517 * @buf: where to get the data from
518 * @count: bytes sent
519 * @ppos: where to start
520 *
521 * Accepts only one cipso rule per write call.
522 * Returns number of bytes written or error code, as appropriate
523 */
524static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
525 size_t count, loff_t *ppos)
526{
527 struct smack_known *skp;
528 struct smack_cipso *scp = NULL;
529 char mapcatset[SMK_LABELLEN];
530 int maplevel;
531 int cat;
532 int catlen;
533 ssize_t rc = -EINVAL;
534 char *data = NULL;
535 char *rule;
536 int ret;
537 int i;
538
539 /*
540 * Must have privilege.
541 * No partial writes.
542 * Enough data must be present.
543 */
544 if (!capable(CAP_MAC_ADMIN))
545 return -EPERM;
546 if (*ppos != 0)
547 return -EINVAL;
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -0700548 if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)
Casey Schauflere114e472008-02-04 22:29:50 -0800549 return -EINVAL;
550
551 data = kzalloc(count + 1, GFP_KERNEL);
552 if (data == NULL)
553 return -ENOMEM;
554
555 if (copy_from_user(data, buf, count) != 0) {
556 rc = -EFAULT;
557 goto unlockedout;
558 }
559
560 data[count] = '\0';
561 rule = data;
562 /*
563 * Only allow one writer at a time. Writes should be
564 * quite rare and small in any case.
565 */
566 mutex_lock(&smack_cipso_lock);
567
568 skp = smk_import_entry(rule, 0);
569 if (skp == NULL)
570 goto out;
571
Fernando Carrijoc19a28e2009-01-07 18:09:08 -0800572 rule += SMK_LABELLEN;
Casey Schauflere114e472008-02-04 22:29:50 -0800573 ret = sscanf(rule, "%d", &maplevel);
574 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
575 goto out;
576
577 rule += SMK_DIGITLEN;
578 ret = sscanf(rule, "%d", &catlen);
579 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
580 goto out;
581
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -0700582 if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
Casey Schauflere114e472008-02-04 22:29:50 -0800583 goto out;
584
585 memset(mapcatset, 0, sizeof(mapcatset));
586
587 for (i = 0; i < catlen; i++) {
588 rule += SMK_DIGITLEN;
589 ret = sscanf(rule, "%d", &cat);
590 if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
591 goto out;
592
593 smack_catset_bit(cat, mapcatset);
594 }
595
596 if (skp->smk_cipso == NULL) {
597 scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL);
598 if (scp == NULL) {
599 rc = -ENOMEM;
600 goto out;
601 }
602 }
603
604 spin_lock_bh(&skp->smk_cipsolock);
605
606 if (scp == NULL)
607 scp = skp->smk_cipso;
608 else
609 skp->smk_cipso = scp;
610
611 scp->smk_level = maplevel;
612 memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset));
613
614 spin_unlock_bh(&skp->smk_cipsolock);
615
616 rc = count;
617out:
618 mutex_unlock(&smack_cipso_lock);
619unlockedout:
620 kfree(data);
621 return rc;
622}
623
624static const struct file_operations smk_cipso_ops = {
625 .open = smk_open_cipso,
626 .read = seq_read,
627 .llseek = seq_lseek,
628 .write = smk_write_cipso,
629 .release = seq_release,
630};
631
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500632/*
633 * Seq_file read operations for /smack/netlabel
634 */
635
636static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
637{
638 if (*pos == SEQ_READ_FINISHED)
639 return NULL;
640
641 return smack_netlbladdrs;
642}
643
644static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
645{
646 struct smk_netlbladdr *skp = ((struct smk_netlbladdr *) v)->smk_next;
647
648 if (skp == NULL)
649 *pos = SEQ_READ_FINISHED;
650
651 return skp;
652}
653/*
654#define BEMASK 0x80000000
655*/
656#define BEMASK 0x00000001
657#define BEBITS (sizeof(__be32) * 8)
658
659/*
660 * Print host/label pairs
661 */
662static int netlbladdr_seq_show(struct seq_file *s, void *v)
663{
664 struct smk_netlbladdr *skp = (struct smk_netlbladdr *) v;
665 unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
666 __be32 bebits;
667 int maskn = 0;
668
669 for (bebits = BEMASK; bebits != 0; maskn++, bebits <<= 1)
670 if ((skp->smk_mask.s_addr & bebits) == 0)
671 break;
672
673 seq_printf(s, "%u.%u.%u.%u/%d %s\n",
674 hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label);
675
676 return 0;
677}
678
679static void netlbladdr_seq_stop(struct seq_file *s, void *v)
680{
681 /* No-op */
682}
683
684static struct seq_operations netlbladdr_seq_ops = {
685 .start = netlbladdr_seq_start,
686 .stop = netlbladdr_seq_stop,
687 .next = netlbladdr_seq_next,
688 .show = netlbladdr_seq_show,
689};
690
691/**
692 * smk_open_netlbladdr - open() for /smack/netlabel
693 * @inode: inode structure representing file
694 * @file: "netlabel" file pointer
695 *
696 * Connect our netlbladdr_seq_* operations with /smack/netlabel
697 * file_operations
698 */
699static int smk_open_netlbladdr(struct inode *inode, struct file *file)
700{
701 return seq_open(file, &netlbladdr_seq_ops);
702}
703
704/**
705 * smk_write_netlbladdr - write() for /smack/netlabel
706 * @filp: file pointer, not actually used
707 * @buf: where to get the data from
708 * @count: bytes sent
709 * @ppos: where to start
710 *
711 * Accepts only one netlbladdr per write call.
712 * Returns number of bytes written or error code, as appropriate
713 */
714static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
715 size_t count, loff_t *ppos)
716{
717 struct smk_netlbladdr *skp;
718 struct sockaddr_in newname;
719 char smack[SMK_LABELLEN];
720 char *sp;
721 char data[SMK_NETLBLADDRMAX];
722 char *host = (char *)&newname.sin_addr.s_addr;
723 int rc;
724 struct netlbl_audit audit_info;
725 struct in_addr mask;
726 unsigned int m;
727 __be32 bebits = BEMASK;
728 __be32 nsa;
729
730 /*
731 * Must have privilege.
732 * No partial writes.
733 * Enough data must be present.
734 * "<addr/mask, as a.b.c.d/e><space><label>"
735 * "<addr, as a.b.c.d><space><label>"
736 */
737 if (!capable(CAP_MAC_ADMIN))
738 return -EPERM;
739 if (*ppos != 0)
740 return -EINVAL;
741 if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX)
742 return -EINVAL;
743 if (copy_from_user(data, buf, count) != 0)
744 return -EFAULT;
745
746 data[count] = '\0';
747
748 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
749 &host[0], &host[1], &host[2], &host[3], &m, smack);
750 if (rc != 6) {
751 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
752 &host[0], &host[1], &host[2], &host[3], smack);
753 if (rc != 5)
754 return -EINVAL;
755 m = BEBITS;
756 }
757 if (m > BEBITS)
758 return -EINVAL;
759
760 sp = smk_import(smack, 0);
761 if (sp == NULL)
762 return -EINVAL;
763
764 for (mask.s_addr = 0; m > 0; m--) {
765 mask.s_addr |= bebits;
766 bebits <<= 1;
767 }
768 /*
769 * Only allow one writer at a time. Writes should be
770 * quite rare and small in any case.
771 */
772 mutex_lock(&smk_netlbladdr_lock);
773
774 nsa = newname.sin_addr.s_addr;
775 for (skp = smack_netlbladdrs; skp != NULL; skp = skp->smk_next)
776 if (skp->smk_host.sin_addr.s_addr == nsa &&
777 skp->smk_mask.s_addr == mask.s_addr)
778 break;
779
780 smk_netlabel_audit_set(&audit_info);
781
782 if (skp == NULL) {
783 skp = kzalloc(sizeof(*skp), GFP_KERNEL);
784 if (skp == NULL)
785 rc = -ENOMEM;
786 else {
787 rc = 0;
788 skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
789 skp->smk_mask.s_addr = mask.s_addr;
790 skp->smk_next = smack_netlbladdrs;
791 skp->smk_label = sp;
792 smack_netlbladdrs = skp;
793 }
794 } else {
795 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
796 &skp->smk_host.sin_addr, &skp->smk_mask,
797 PF_INET, &audit_info);
798 skp->smk_label = sp;
799 }
800
801 /*
802 * Now tell netlabel about the single label nature of
803 * this host so that incoming packets get labeled.
804 */
805
806 if (rc == 0)
807 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
808 &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
809 smack_to_secid(skp->smk_label), &audit_info);
810
811 if (rc == 0)
812 rc = count;
813
814 mutex_unlock(&smk_netlbladdr_lock);
815
816 return rc;
817}
818
819static const struct file_operations smk_netlbladdr_ops = {
820 .open = smk_open_netlbladdr,
821 .read = seq_read,
822 .llseek = seq_lseek,
823 .write = smk_write_netlbladdr,
824 .release = seq_release,
825};
826
Casey Schauflere114e472008-02-04 22:29:50 -0800827/**
828 * smk_read_doi - read() for /smack/doi
829 * @filp: file pointer, not actually used
830 * @buf: where to put the result
831 * @count: maximum to send along
832 * @ppos: where to start
833 *
834 * Returns number of bytes read or error code, as appropriate
835 */
836static ssize_t smk_read_doi(struct file *filp, char __user *buf,
837 size_t count, loff_t *ppos)
838{
839 char temp[80];
840 ssize_t rc;
841
842 if (*ppos != 0)
843 return 0;
844
845 sprintf(temp, "%d", smk_cipso_doi_value);
846 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
847
848 return rc;
849}
850
851/**
852 * smk_write_doi - write() for /smack/doi
853 * @filp: file pointer, not actually used
854 * @buf: where to get the data from
855 * @count: bytes sent
856 * @ppos: where to start
857 *
858 * Returns number of bytes written or error code, as appropriate
859 */
860static ssize_t smk_write_doi(struct file *file, const char __user *buf,
861 size_t count, loff_t *ppos)
862{
863 char temp[80];
864 int i;
865
866 if (!capable(CAP_MAC_ADMIN))
867 return -EPERM;
868
869 if (count >= sizeof(temp) || count == 0)
870 return -EINVAL;
871
872 if (copy_from_user(temp, buf, count) != 0)
873 return -EFAULT;
874
875 temp[count] = '\0';
876
877 if (sscanf(temp, "%d", &i) != 1)
878 return -EINVAL;
879
880 smk_cipso_doi_value = i;
881
882 smk_cipso_doi();
883
884 return count;
885}
886
887static const struct file_operations smk_doi_ops = {
888 .read = smk_read_doi,
889 .write = smk_write_doi,
890};
891
892/**
893 * smk_read_direct - read() for /smack/direct
894 * @filp: file pointer, not actually used
895 * @buf: where to put the result
896 * @count: maximum to send along
897 * @ppos: where to start
898 *
899 * Returns number of bytes read or error code, as appropriate
900 */
901static ssize_t smk_read_direct(struct file *filp, char __user *buf,
902 size_t count, loff_t *ppos)
903{
904 char temp[80];
905 ssize_t rc;
906
907 if (*ppos != 0)
908 return 0;
909
910 sprintf(temp, "%d", smack_cipso_direct);
911 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
912
913 return rc;
914}
915
916/**
917 * smk_write_direct - write() for /smack/direct
918 * @filp: file pointer, not actually used
919 * @buf: where to get the data from
920 * @count: bytes sent
921 * @ppos: where to start
922 *
923 * Returns number of bytes written or error code, as appropriate
924 */
925static ssize_t smk_write_direct(struct file *file, const char __user *buf,
926 size_t count, loff_t *ppos)
927{
928 char temp[80];
929 int i;
930
931 if (!capable(CAP_MAC_ADMIN))
932 return -EPERM;
933
934 if (count >= sizeof(temp) || count == 0)
935 return -EINVAL;
936
937 if (copy_from_user(temp, buf, count) != 0)
938 return -EFAULT;
939
940 temp[count] = '\0';
941
942 if (sscanf(temp, "%d", &i) != 1)
943 return -EINVAL;
944
945 smack_cipso_direct = i;
946
947 return count;
948}
949
950static const struct file_operations smk_direct_ops = {
951 .read = smk_read_direct,
952 .write = smk_write_direct,
953};
954
955/**
956 * smk_read_ambient - read() for /smack/ambient
957 * @filp: file pointer, not actually used
958 * @buf: where to put the result
959 * @cn: maximum to send along
960 * @ppos: where to start
961 *
962 * Returns number of bytes read or error code, as appropriate
963 */
964static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
965 size_t cn, loff_t *ppos)
966{
967 ssize_t rc;
Casey Schauflere114e472008-02-04 22:29:50 -0800968 int asize;
969
970 if (*ppos != 0)
971 return 0;
972 /*
973 * Being careful to avoid a problem in the case where
974 * smack_net_ambient gets changed in midstream.
Casey Schauflere114e472008-02-04 22:29:50 -0800975 */
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800976 mutex_lock(&smack_ambient_lock);
Casey Schauflere114e472008-02-04 22:29:50 -0800977
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800978 asize = strlen(smack_net_ambient) + 1;
Casey Schauflere114e472008-02-04 22:29:50 -0800979
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800980 if (cn >= asize)
981 rc = simple_read_from_buffer(buf, cn, ppos,
982 smack_net_ambient, asize);
983 else
984 rc = -EINVAL;
985
986 mutex_unlock(&smack_ambient_lock);
Casey Schauflere114e472008-02-04 22:29:50 -0800987
988 return rc;
989}
990
991/**
992 * smk_write_ambient - write() for /smack/ambient
993 * @filp: file pointer, not actually used
994 * @buf: where to get the data from
995 * @count: bytes sent
996 * @ppos: where to start
997 *
998 * Returns number of bytes written or error code, as appropriate
999 */
1000static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1001 size_t count, loff_t *ppos)
1002{
1003 char in[SMK_LABELLEN];
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001004 char *oldambient;
Casey Schauflere114e472008-02-04 22:29:50 -08001005 char *smack;
1006
1007 if (!capable(CAP_MAC_ADMIN))
1008 return -EPERM;
1009
1010 if (count >= SMK_LABELLEN)
1011 return -EINVAL;
1012
1013 if (copy_from_user(in, buf, count) != 0)
1014 return -EFAULT;
1015
1016 smack = smk_import(in, count);
1017 if (smack == NULL)
1018 return -EINVAL;
1019
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001020 mutex_lock(&smack_ambient_lock);
1021
1022 oldambient = smack_net_ambient;
Casey Schauflere114e472008-02-04 22:29:50 -08001023 smack_net_ambient = smack;
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001024 smk_unlbl_ambient(oldambient);
1025
1026 mutex_unlock(&smack_ambient_lock);
Casey Schauflere114e472008-02-04 22:29:50 -08001027
1028 return count;
1029}
1030
1031static const struct file_operations smk_ambient_ops = {
1032 .read = smk_read_ambient,
1033 .write = smk_write_ambient,
1034};
1035
Casey Schaufler15446232008-07-30 15:37:11 -07001036/**
1037 * smk_read_onlycap - read() for /smack/onlycap
1038 * @filp: file pointer, not actually used
1039 * @buf: where to put the result
1040 * @cn: maximum to send along
1041 * @ppos: where to start
1042 *
1043 * Returns number of bytes read or error code, as appropriate
1044 */
1045static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
1046 size_t cn, loff_t *ppos)
1047{
1048 char *smack = "";
1049 ssize_t rc = -EINVAL;
1050 int asize;
1051
1052 if (*ppos != 0)
1053 return 0;
1054
1055 if (smack_onlycap != NULL)
1056 smack = smack_onlycap;
1057
1058 asize = strlen(smack) + 1;
1059
1060 if (cn >= asize)
1061 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
1062
1063 return rc;
1064}
1065
1066/**
1067 * smk_write_onlycap - write() for /smack/onlycap
1068 * @filp: file pointer, not actually used
1069 * @buf: where to get the data from
1070 * @count: bytes sent
1071 * @ppos: where to start
1072 *
1073 * Returns number of bytes written or error code, as appropriate
1074 */
1075static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1076 size_t count, loff_t *ppos)
1077{
1078 char in[SMK_LABELLEN];
David Howellsb6dff3e2008-11-14 10:39:16 +11001079 char *sp = current->cred->security;
Casey Schaufler15446232008-07-30 15:37:11 -07001080
1081 if (!capable(CAP_MAC_ADMIN))
1082 return -EPERM;
1083
1084 /*
1085 * This can be done using smk_access() but is done
1086 * explicitly for clarity. The smk_access() implementation
1087 * would use smk_access(smack_onlycap, MAY_WRITE)
1088 */
1089 if (smack_onlycap != NULL && smack_onlycap != sp)
1090 return -EPERM;
1091
1092 if (count >= SMK_LABELLEN)
1093 return -EINVAL;
1094
1095 if (copy_from_user(in, buf, count) != 0)
1096 return -EFAULT;
1097
1098 /*
1099 * Should the null string be passed in unset the onlycap value.
1100 * This seems like something to be careful with as usually
1101 * smk_import only expects to return NULL for errors. It
1102 * is usually the case that a nullstring or "\n" would be
1103 * bad to pass to smk_import but in fact this is useful here.
1104 */
1105 smack_onlycap = smk_import(in, count);
1106
1107 return count;
1108}
1109
1110static const struct file_operations smk_onlycap_ops = {
1111 .read = smk_read_onlycap,
1112 .write = smk_write_onlycap,
1113};
1114
Casey Schauflere114e472008-02-04 22:29:50 -08001115/**
1116 * smk_fill_super - fill the /smackfs superblock
1117 * @sb: the empty superblock
1118 * @data: unused
1119 * @silent: unused
1120 *
1121 * Fill in the well known entries for /smack
1122 *
1123 * Returns 0 on success, an error code on failure
1124 */
1125static int smk_fill_super(struct super_block *sb, void *data, int silent)
1126{
1127 int rc;
1128 struct inode *root_inode;
1129
1130 static struct tree_descr smack_files[] = {
1131 [SMK_LOAD] =
1132 {"load", &smk_load_ops, S_IRUGO|S_IWUSR},
1133 [SMK_CIPSO] =
1134 {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
1135 [SMK_DOI] =
1136 {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
1137 [SMK_DIRECT] =
1138 {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
1139 [SMK_AMBIENT] =
1140 {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001141 [SMK_NETLBLADDR] =
1142 {"netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
Casey Schaufler15446232008-07-30 15:37:11 -07001143 [SMK_ONLYCAP] =
1144 {"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
Casey Schauflere114e472008-02-04 22:29:50 -08001145 /* last one */ {""}
1146 };
1147
1148 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
1149 if (rc != 0) {
1150 printk(KERN_ERR "%s failed %d while creating inodes\n",
1151 __func__, rc);
1152 return rc;
1153 }
1154
1155 root_inode = sb->s_root->d_inode;
1156 root_inode->i_security = new_inode_smack(smack_known_floor.smk_known);
1157
1158 return 0;
1159}
1160
1161/**
1162 * smk_get_sb - get the smackfs superblock
1163 * @fs_type: passed along without comment
1164 * @flags: passed along without comment
1165 * @dev_name: passed along without comment
1166 * @data: passed along without comment
1167 * @mnt: passed along without comment
1168 *
1169 * Just passes everything along.
1170 *
1171 * Returns what the lower level code does.
1172 */
1173static int smk_get_sb(struct file_system_type *fs_type,
1174 int flags, const char *dev_name, void *data,
1175 struct vfsmount *mnt)
1176{
1177 return get_sb_single(fs_type, flags, data, smk_fill_super, mnt);
1178}
1179
1180static struct file_system_type smk_fs_type = {
1181 .name = "smackfs",
1182 .get_sb = smk_get_sb,
1183 .kill_sb = kill_litter_super,
1184};
1185
1186static struct vfsmount *smackfs_mount;
1187
1188/**
1189 * init_smk_fs - get the smackfs superblock
1190 *
1191 * register the smackfs
1192 *
Ahmed S. Darwish076c54c2008-03-06 18:09:10 +02001193 * Do not register smackfs if Smack wasn't enabled
1194 * on boot. We can not put this method normally under the
1195 * smack_init() code path since the security subsystem get
1196 * initialized before the vfs caches.
1197 *
1198 * Returns true if we were not chosen on boot or if
1199 * we were chosen and filesystem registration succeeded.
Casey Schauflere114e472008-02-04 22:29:50 -08001200 */
1201static int __init init_smk_fs(void)
1202{
1203 int err;
1204
Ahmed S. Darwish076c54c2008-03-06 18:09:10 +02001205 if (!security_module_enable(&smack_ops))
1206 return 0;
1207
Casey Schauflere114e472008-02-04 22:29:50 -08001208 err = register_filesystem(&smk_fs_type);
1209 if (!err) {
1210 smackfs_mount = kern_mount(&smk_fs_type);
1211 if (IS_ERR(smackfs_mount)) {
1212 printk(KERN_ERR "smackfs: could not mount!\n");
1213 err = PTR_ERR(smackfs_mount);
1214 smackfs_mount = NULL;
1215 }
1216 }
1217
Casey Schauflere114e472008-02-04 22:29:50 -08001218 smk_cipso_doi();
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001219 smk_unlbl_ambient(NULL);
Casey Schauflere114e472008-02-04 22:29:50 -08001220
1221 return err;
1222}
1223
1224__initcall(init_smk_fs);