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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 */
Etienne Bassetecfcc532009-04-08 20:40:06 +020044 SMK_LOGGING = 10, /* logging */
Casey Schauflere114e472008-02-04 22:29:50 -080045};
46
47/*
48 * List locks
49 */
50static DEFINE_MUTEX(smack_list_lock);
51static DEFINE_MUTEX(smack_cipso_lock);
Casey Schaufler4bc87e62008-02-15 15:24:25 -080052static DEFINE_MUTEX(smack_ambient_lock);
Casey Schaufler6d3dc072008-12-31 12:54:12 -050053static DEFINE_MUTEX(smk_netlbladdr_lock);
Casey Schauflere114e472008-02-04 22:29:50 -080054
55/*
56 * This is the "ambient" label for network traffic.
57 * If it isn't somehow marked, use this.
58 * It can be reset via smackfs/ambient
59 */
60char *smack_net_ambient = smack_known_floor.smk_known;
61
62/*
Casey Schauflere114e472008-02-04 22:29:50 -080063 * This is the level in a CIPSO header that indicates a
64 * smack label is contained directly in the category set.
65 * It can be reset via smackfs/direct
66 */
67int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
68
Casey Schaufler15446232008-07-30 15:37:11 -070069/*
70 * Unless a process is running with this label even
71 * having CAP_MAC_OVERRIDE isn't enough to grant
72 * privilege to violate MAC policy. If no label is
73 * designated (the NULL case) capabilities apply to
74 * everyone. It is expected that the hat (^) label
75 * will be used if any label is used.
76 */
77char *smack_onlycap;
78
Casey Schaufler6d3dc072008-12-31 12:54:12 -050079/*
80 * Certain IP addresses may be designated as single label hosts.
81 * Packets are sent there unlabeled, but only from tasks that
82 * can write to the specified label.
83 */
Etienne Basset7198e2e2009-03-24 20:53:24 +010084
85LIST_HEAD(smk_netlbladdr_list);
86LIST_HEAD(smack_rule_list);
Casey Schaufler6d3dc072008-12-31 12:54:12 -050087
Casey Schauflere114e472008-02-04 22:29:50 -080088static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
Casey Schauflere114e472008-02-04 22:29:50 -080089
Etienne Basset43031542009-03-27 17:11:01 -040090const char *smack_cipso_option = SMACK_CIPSO_OPTION;
91
92
Casey Schauflere114e472008-02-04 22:29:50 -080093#define SEQ_READ_FINISHED 1
94
95/*
Casey Schauflere114e472008-02-04 22:29:50 -080096 * Values for parsing cipso rules
97 * SMK_DIGITLEN: Length of a digit field in a rule.
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -070098 * SMK_CIPSOMIN: Minimum possible cipso rule length.
99 * SMK_CIPSOMAX: Maximum possible cipso rule length.
Casey Schauflere114e472008-02-04 22:29:50 -0800100 */
101#define SMK_DIGITLEN 4
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -0700102#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
103#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
104
105/*
106 * Values for parsing MAC rules
107 * SMK_ACCESS: Maximum possible combination of access permissions
108 * SMK_ACCESSLEN: Maximum length for a rule access field
109 * SMK_LOADLEN: Smack rule length
110 */
111#define SMK_ACCESS "rwxa"
112#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
113#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
114
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500115/**
116 * smk_netlabel_audit_set - fill a netlbl_audit struct
117 * @nap: structure to fill
118 */
119static void smk_netlabel_audit_set(struct netlbl_audit *nap)
120{
121 nap->loginuid = audit_get_loginuid(current);
122 nap->sessionid = audit_get_sessionid(current);
123 nap->secid = smack_to_secid(current_security());
124}
125
126/*
127 * Values for parsing single label host rules
128 * "1.2.3.4 X"
129 * "192.168.138.129/32 abcdefghijklmnopqrstuvw"
130 */
131#define SMK_NETLBLADDRMIN 9
132#define SMK_NETLBLADDRMAX 42
Casey Schauflere114e472008-02-04 22:29:50 -0800133
134/*
135 * Seq_file read operations for /smack/load
136 */
137
138static void *load_seq_start(struct seq_file *s, loff_t *pos)
139{
140 if (*pos == SEQ_READ_FINISHED)
141 return NULL;
Etienne Basset7198e2e2009-03-24 20:53:24 +0100142 if (list_empty(&smack_rule_list))
143 return NULL;
144 return smack_rule_list.next;
Casey Schauflere114e472008-02-04 22:29:50 -0800145}
146
147static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
148{
Etienne Basset7198e2e2009-03-24 20:53:24 +0100149 struct list_head *list = v;
Casey Schauflere114e472008-02-04 22:29:50 -0800150
Etienne Basset7198e2e2009-03-24 20:53:24 +0100151 if (list_is_last(list, &smack_rule_list)) {
Casey Schauflere114e472008-02-04 22:29:50 -0800152 *pos = SEQ_READ_FINISHED;
Etienne Basset7198e2e2009-03-24 20:53:24 +0100153 return NULL;
154 }
155 return list->next;
Casey Schauflere114e472008-02-04 22:29:50 -0800156}
157
158static int load_seq_show(struct seq_file *s, void *v)
159{
Etienne Basset7198e2e2009-03-24 20:53:24 +0100160 struct list_head *list = v;
161 struct smack_rule *srp =
162 list_entry(list, struct smack_rule, list);
Casey Schauflere114e472008-02-04 22:29:50 -0800163
164 seq_printf(s, "%s %s", (char *)srp->smk_subject,
165 (char *)srp->smk_object);
166
167 seq_putc(s, ' ');
168
169 if (srp->smk_access & MAY_READ)
170 seq_putc(s, 'r');
171 if (srp->smk_access & MAY_WRITE)
172 seq_putc(s, 'w');
173 if (srp->smk_access & MAY_EXEC)
174 seq_putc(s, 'x');
175 if (srp->smk_access & MAY_APPEND)
176 seq_putc(s, 'a');
177 if (srp->smk_access == 0)
178 seq_putc(s, '-');
179
180 seq_putc(s, '\n');
181
182 return 0;
183}
184
185static void load_seq_stop(struct seq_file *s, void *v)
186{
187 /* No-op */
188}
189
James Morris88e9d342009-09-22 16:43:43 -0700190static const struct seq_operations load_seq_ops = {
Casey Schauflere114e472008-02-04 22:29:50 -0800191 .start = load_seq_start,
192 .next = load_seq_next,
193 .show = load_seq_show,
194 .stop = load_seq_stop,
195};
196
197/**
198 * smk_open_load - open() for /smack/load
199 * @inode: inode structure representing file
200 * @file: "load" file pointer
201 *
202 * For reading, use load_seq_* seq_file reading operations.
203 */
204static int smk_open_load(struct inode *inode, struct file *file)
205{
Ahmed S. Darwishcb622bb2008-03-24 12:29:49 -0700206 return seq_open(file, &load_seq_ops);
Casey Schauflere114e472008-02-04 22:29:50 -0800207}
208
209/**
210 * smk_set_access - add a rule to the rule list
211 * @srp: the new rule to add
212 *
213 * Looks through the current subject/object/access list for
214 * the subject/object pair and replaces the access that was
215 * there. If the pair isn't found add it with the specified
216 * access.
Sergio Luis81ea7142008-12-22 01:16:15 -0300217 *
218 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
219 * during the allocation of the new pair to add.
Casey Schauflere114e472008-02-04 22:29:50 -0800220 */
Sergio Luis81ea7142008-12-22 01:16:15 -0300221static int smk_set_access(struct smack_rule *srp)
Casey Schauflere114e472008-02-04 22:29:50 -0800222{
Etienne Basset7198e2e2009-03-24 20:53:24 +0100223 struct smack_rule *sp;
Sergio Luis81ea7142008-12-22 01:16:15 -0300224 int ret = 0;
Etienne Basset7198e2e2009-03-24 20:53:24 +0100225 int found;
Casey Schauflere114e472008-02-04 22:29:50 -0800226 mutex_lock(&smack_list_lock);
227
Etienne Basset7198e2e2009-03-24 20:53:24 +0100228 found = 0;
229 list_for_each_entry_rcu(sp, &smack_rule_list, list) {
230 if (sp->smk_subject == srp->smk_subject &&
231 sp->smk_object == srp->smk_object) {
232 found = 1;
233 sp->smk_access = srp->smk_access;
Casey Schauflere114e472008-02-04 22:29:50 -0800234 break;
235 }
Casey Schauflere114e472008-02-04 22:29:50 -0800236 }
Etienne Basset7198e2e2009-03-24 20:53:24 +0100237 if (found == 0)
238 list_add_rcu(&srp->list, &smack_rule_list);
Casey Schauflere114e472008-02-04 22:29:50 -0800239
240 mutex_unlock(&smack_list_lock);
241
Sergio Luis81ea7142008-12-22 01:16:15 -0300242 return ret;
Casey Schauflere114e472008-02-04 22:29:50 -0800243}
244
245/**
246 * smk_write_load - write() for /smack/load
Randy Dunlap251a2a92009-02-18 11:42:33 -0800247 * @file: file pointer, not actually used
Casey Schauflere114e472008-02-04 22:29:50 -0800248 * @buf: where to get the data from
249 * @count: bytes sent
250 * @ppos: where to start - must be 0
251 *
252 * Get one smack access rule from above.
253 * The format is exactly:
254 * char subject[SMK_LABELLEN]
255 * char object[SMK_LABELLEN]
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -0700256 * char access[SMK_ACCESSLEN]
Casey Schauflere114e472008-02-04 22:29:50 -0800257 *
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -0700258 * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes.
Casey Schauflere114e472008-02-04 22:29:50 -0800259 */
Casey Schauflere114e472008-02-04 22:29:50 -0800260static ssize_t smk_write_load(struct file *file, const char __user *buf,
261 size_t count, loff_t *ppos)
262{
Etienne Basset7198e2e2009-03-24 20:53:24 +0100263 struct smack_rule *rule;
Casey Schauflere114e472008-02-04 22:29:50 -0800264 char *data;
265 int rc = -EINVAL;
266
267 /*
268 * Must have privilege.
269 * No partial writes.
270 * Enough data must be present.
271 */
272 if (!capable(CAP_MAC_ADMIN))
273 return -EPERM;
Etienne Basset7198e2e2009-03-24 20:53:24 +0100274
275 if (*ppos != 0 || count != SMK_LOADLEN)
Casey Schauflere114e472008-02-04 22:29:50 -0800276 return -EINVAL;
277
278 data = kzalloc(count, GFP_KERNEL);
279 if (data == NULL)
280 return -ENOMEM;
281
282 if (copy_from_user(data, buf, count) != 0) {
283 rc = -EFAULT;
284 goto out;
285 }
286
Etienne Basset7198e2e2009-03-24 20:53:24 +0100287 rule = kzalloc(sizeof(*rule), GFP_KERNEL);
288 if (rule == NULL) {
289 rc = -ENOMEM;
Casey Schauflere114e472008-02-04 22:29:50 -0800290 goto out;
Etienne Basset7198e2e2009-03-24 20:53:24 +0100291 }
Casey Schauflere114e472008-02-04 22:29:50 -0800292
Etienne Basset7198e2e2009-03-24 20:53:24 +0100293 rule->smk_subject = smk_import(data, 0);
294 if (rule->smk_subject == NULL)
295 goto out_free_rule;
Casey Schauflere114e472008-02-04 22:29:50 -0800296
Etienne Basset7198e2e2009-03-24 20:53:24 +0100297 rule->smk_object = smk_import(data + SMK_LABELLEN, 0);
298 if (rule->smk_object == NULL)
299 goto out_free_rule;
300
301 rule->smk_access = 0;
Casey Schauflere114e472008-02-04 22:29:50 -0800302
303 switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
304 case '-':
305 break;
306 case 'r':
307 case 'R':
Etienne Basset7198e2e2009-03-24 20:53:24 +0100308 rule->smk_access |= MAY_READ;
Casey Schauflere114e472008-02-04 22:29:50 -0800309 break;
310 default:
Etienne Basset7198e2e2009-03-24 20:53:24 +0100311 goto out_free_rule;
Casey Schauflere114e472008-02-04 22:29:50 -0800312 }
313
314 switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
315 case '-':
316 break;
317 case 'w':
318 case 'W':
Etienne Basset7198e2e2009-03-24 20:53:24 +0100319 rule->smk_access |= MAY_WRITE;
Casey Schauflere114e472008-02-04 22:29:50 -0800320 break;
321 default:
Etienne Basset7198e2e2009-03-24 20:53:24 +0100322 goto out_free_rule;
Casey Schauflere114e472008-02-04 22:29:50 -0800323 }
324
325 switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
326 case '-':
327 break;
328 case 'x':
329 case 'X':
Etienne Basset7198e2e2009-03-24 20:53:24 +0100330 rule->smk_access |= MAY_EXEC;
Casey Schauflere114e472008-02-04 22:29:50 -0800331 break;
332 default:
Etienne Basset7198e2e2009-03-24 20:53:24 +0100333 goto out_free_rule;
Casey Schauflere114e472008-02-04 22:29:50 -0800334 }
335
336 switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
337 case '-':
338 break;
339 case 'a':
340 case 'A':
Etienne Basset7198e2e2009-03-24 20:53:24 +0100341 rule->smk_access |= MAY_APPEND;
Casey Schauflere114e472008-02-04 22:29:50 -0800342 break;
343 default:
Etienne Basset7198e2e2009-03-24 20:53:24 +0100344 goto out_free_rule;
Casey Schauflere114e472008-02-04 22:29:50 -0800345 }
346
Etienne Basset7198e2e2009-03-24 20:53:24 +0100347 rc = smk_set_access(rule);
Sergio Luis81ea7142008-12-22 01:16:15 -0300348
349 if (!rc)
350 rc = count;
Etienne Basset7198e2e2009-03-24 20:53:24 +0100351 goto out;
Casey Schauflere114e472008-02-04 22:29:50 -0800352
Etienne Basset7198e2e2009-03-24 20:53:24 +0100353out_free_rule:
354 kfree(rule);
Casey Schauflere114e472008-02-04 22:29:50 -0800355out:
356 kfree(data);
357 return rc;
358}
359
360static const struct file_operations smk_load_ops = {
361 .open = smk_open_load,
362 .read = seq_read,
363 .llseek = seq_lseek,
364 .write = smk_write_load,
Ahmed S. Darwishcb622bb2008-03-24 12:29:49 -0700365 .release = seq_release,
Casey Schauflere114e472008-02-04 22:29:50 -0800366};
367
368/**
369 * smk_cipso_doi - initialize the CIPSO domain
370 */
Casey Schaufler30aa4fa2008-04-28 02:13:43 -0700371static void smk_cipso_doi(void)
Casey Schauflere114e472008-02-04 22:29:50 -0800372{
373 int rc;
374 struct cipso_v4_doi *doip;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500375 struct netlbl_audit nai;
Casey Schauflere114e472008-02-04 22:29:50 -0800376
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500377 smk_netlabel_audit_set(&nai);
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800378
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500379 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
Casey Schauflere114e472008-02-04 22:29:50 -0800380 if (rc != 0)
381 printk(KERN_WARNING "%s:%d remove rc = %d\n",
382 __func__, __LINE__, rc);
383
384 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
385 if (doip == NULL)
386 panic("smack: Failed to initialize cipso DOI.\n");
387 doip->map.std = NULL;
388 doip->doi = smk_cipso_doi_value;
389 doip->type = CIPSO_V4_MAP_PASS;
390 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
391 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
392 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
393
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500394 rc = netlbl_cfg_cipsov4_add(doip, &nai);
Paul Mooreb1edeb12008-10-10 10:16:31 -0400395 if (rc != 0) {
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500396 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
Casey Schauflere114e472008-02-04 22:29:50 -0800397 __func__, __LINE__, rc);
Paul Mooreb1edeb12008-10-10 10:16:31 -0400398 kfree(doip);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500399 return;
400 }
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500401 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500402 if (rc != 0) {
403 printk(KERN_WARNING "%s:%d map add rc = %d\n",
404 __func__, __LINE__, rc);
405 kfree(doip);
406 return;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400407 }
Casey Schauflere114e472008-02-04 22:29:50 -0800408}
409
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800410/**
411 * smk_unlbl_ambient - initialize the unlabeled domain
Randy Dunlap251a2a92009-02-18 11:42:33 -0800412 * @oldambient: previous domain string
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800413 */
Casey Schaufler30aa4fa2008-04-28 02:13:43 -0700414static void smk_unlbl_ambient(char *oldambient)
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800415{
416 int rc;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500417 struct netlbl_audit nai;
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800418
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500419 smk_netlabel_audit_set(&nai);
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800420
421 if (oldambient != NULL) {
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500422 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800423 if (rc != 0)
424 printk(KERN_WARNING "%s:%d remove rc = %d\n",
425 __func__, __LINE__, rc);
426 }
427
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500428 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET,
429 NULL, NULL, &nai);
Casey Schaufler4bc87e62008-02-15 15:24:25 -0800430 if (rc != 0)
431 printk(KERN_WARNING "%s:%d add rc = %d\n",
432 __func__, __LINE__, rc);
433}
434
Casey Schauflere114e472008-02-04 22:29:50 -0800435/*
436 * Seq_file read operations for /smack/cipso
437 */
438
439static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
440{
441 if (*pos == SEQ_READ_FINISHED)
442 return NULL;
Etienne Basset7198e2e2009-03-24 20:53:24 +0100443 if (list_empty(&smack_known_list))
444 return NULL;
Casey Schauflere114e472008-02-04 22:29:50 -0800445
Etienne Basset7198e2e2009-03-24 20:53:24 +0100446 return smack_known_list.next;
Casey Schauflere114e472008-02-04 22:29:50 -0800447}
448
449static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
450{
Etienne Basset7198e2e2009-03-24 20:53:24 +0100451 struct list_head *list = v;
Casey Schauflere114e472008-02-04 22:29:50 -0800452
453 /*
Etienne Basset7198e2e2009-03-24 20:53:24 +0100454 * labels with no associated cipso value wont be printed
455 * in cipso_seq_show
Casey Schauflere114e472008-02-04 22:29:50 -0800456 */
Etienne Basset7198e2e2009-03-24 20:53:24 +0100457 if (list_is_last(list, &smack_known_list)) {
Casey Schauflere114e472008-02-04 22:29:50 -0800458 *pos = SEQ_READ_FINISHED;
Etienne Basset7198e2e2009-03-24 20:53:24 +0100459 return NULL;
460 }
Casey Schauflere114e472008-02-04 22:29:50 -0800461
Etienne Basset7198e2e2009-03-24 20:53:24 +0100462 return list->next;
Casey Schauflere114e472008-02-04 22:29:50 -0800463}
464
465/*
466 * Print cipso labels in format:
467 * label level[/cat[,cat]]
468 */
469static int cipso_seq_show(struct seq_file *s, void *v)
470{
Etienne Basset7198e2e2009-03-24 20:53:24 +0100471 struct list_head *list = v;
472 struct smack_known *skp =
473 list_entry(list, struct smack_known, list);
Casey Schauflere114e472008-02-04 22:29:50 -0800474 struct smack_cipso *scp = skp->smk_cipso;
475 char *cbp;
476 char sep = '/';
477 int cat = 1;
478 int i;
479 unsigned char m;
480
481 if (scp == NULL)
482 return 0;
483
484 seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level);
485
486 cbp = scp->smk_catset;
487 for (i = 0; i < SMK_LABELLEN; i++)
488 for (m = 0x80; m != 0; m >>= 1) {
489 if (m & cbp[i]) {
490 seq_printf(s, "%c%d", sep, cat);
491 sep = ',';
492 }
493 cat++;
494 }
495
496 seq_putc(s, '\n');
497
498 return 0;
499}
500
501static void cipso_seq_stop(struct seq_file *s, void *v)
502{
503 /* No-op */
504}
505
James Morris88e9d342009-09-22 16:43:43 -0700506static const struct seq_operations cipso_seq_ops = {
Casey Schauflere114e472008-02-04 22:29:50 -0800507 .start = cipso_seq_start,
508 .stop = cipso_seq_stop,
509 .next = cipso_seq_next,
510 .show = cipso_seq_show,
511};
512
513/**
514 * smk_open_cipso - open() for /smack/cipso
515 * @inode: inode structure representing file
516 * @file: "cipso" file pointer
517 *
518 * Connect our cipso_seq_* operations with /smack/cipso
519 * file_operations
520 */
521static int smk_open_cipso(struct inode *inode, struct file *file)
522{
523 return seq_open(file, &cipso_seq_ops);
524}
525
526/**
527 * smk_write_cipso - write() for /smack/cipso
Randy Dunlap251a2a92009-02-18 11:42:33 -0800528 * @file: file pointer, not actually used
Casey Schauflere114e472008-02-04 22:29:50 -0800529 * @buf: where to get the data from
530 * @count: bytes sent
531 * @ppos: where to start
532 *
533 * Accepts only one cipso rule per write call.
534 * Returns number of bytes written or error code, as appropriate
535 */
536static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
537 size_t count, loff_t *ppos)
538{
539 struct smack_known *skp;
540 struct smack_cipso *scp = NULL;
541 char mapcatset[SMK_LABELLEN];
542 int maplevel;
543 int cat;
544 int catlen;
545 ssize_t rc = -EINVAL;
546 char *data = NULL;
547 char *rule;
548 int ret;
549 int i;
550
551 /*
552 * Must have privilege.
553 * No partial writes.
554 * Enough data must be present.
555 */
556 if (!capable(CAP_MAC_ADMIN))
557 return -EPERM;
558 if (*ppos != 0)
559 return -EINVAL;
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -0700560 if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)
Casey Schauflere114e472008-02-04 22:29:50 -0800561 return -EINVAL;
562
563 data = kzalloc(count + 1, GFP_KERNEL);
564 if (data == NULL)
565 return -ENOMEM;
566
567 if (copy_from_user(data, buf, count) != 0) {
568 rc = -EFAULT;
569 goto unlockedout;
570 }
571
Etienne Basset43031542009-03-27 17:11:01 -0400572 /* labels cannot begin with a '-' */
573 if (data[0] == '-') {
574 rc = -EINVAL;
575 goto unlockedout;
576 }
Casey Schauflere114e472008-02-04 22:29:50 -0800577 data[count] = '\0';
578 rule = data;
579 /*
580 * Only allow one writer at a time. Writes should be
581 * quite rare and small in any case.
582 */
583 mutex_lock(&smack_cipso_lock);
584
585 skp = smk_import_entry(rule, 0);
586 if (skp == NULL)
587 goto out;
588
Fernando Carrijoc19a28e2009-01-07 18:09:08 -0800589 rule += SMK_LABELLEN;
Casey Schauflere114e472008-02-04 22:29:50 -0800590 ret = sscanf(rule, "%d", &maplevel);
591 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
592 goto out;
593
594 rule += SMK_DIGITLEN;
595 ret = sscanf(rule, "%d", &catlen);
596 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
597 goto out;
598
Ahmed S. Darwishb500ce82008-03-13 12:32:34 -0700599 if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
Casey Schauflere114e472008-02-04 22:29:50 -0800600 goto out;
601
602 memset(mapcatset, 0, sizeof(mapcatset));
603
604 for (i = 0; i < catlen; i++) {
605 rule += SMK_DIGITLEN;
606 ret = sscanf(rule, "%d", &cat);
607 if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
608 goto out;
609
610 smack_catset_bit(cat, mapcatset);
611 }
612
613 if (skp->smk_cipso == NULL) {
614 scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL);
615 if (scp == NULL) {
616 rc = -ENOMEM;
617 goto out;
618 }
619 }
620
621 spin_lock_bh(&skp->smk_cipsolock);
622
623 if (scp == NULL)
624 scp = skp->smk_cipso;
625 else
626 skp->smk_cipso = scp;
627
628 scp->smk_level = maplevel;
629 memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset));
630
631 spin_unlock_bh(&skp->smk_cipsolock);
632
633 rc = count;
634out:
635 mutex_unlock(&smack_cipso_lock);
636unlockedout:
637 kfree(data);
638 return rc;
639}
640
641static const struct file_operations smk_cipso_ops = {
642 .open = smk_open_cipso,
643 .read = seq_read,
644 .llseek = seq_lseek,
645 .write = smk_write_cipso,
646 .release = seq_release,
647};
648
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500649/*
650 * Seq_file read operations for /smack/netlabel
651 */
652
653static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
654{
655 if (*pos == SEQ_READ_FINISHED)
656 return NULL;
Etienne Basset7198e2e2009-03-24 20:53:24 +0100657 if (list_empty(&smk_netlbladdr_list))
658 return NULL;
659 return smk_netlbladdr_list.next;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500660}
661
662static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
663{
Etienne Basset7198e2e2009-03-24 20:53:24 +0100664 struct list_head *list = v;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500665
Etienne Basset7198e2e2009-03-24 20:53:24 +0100666 if (list_is_last(list, &smk_netlbladdr_list)) {
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500667 *pos = SEQ_READ_FINISHED;
Etienne Basset7198e2e2009-03-24 20:53:24 +0100668 return NULL;
669 }
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500670
Etienne Basset7198e2e2009-03-24 20:53:24 +0100671 return list->next;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500672}
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500673#define BEBITS (sizeof(__be32) * 8)
674
675/*
676 * Print host/label pairs
677 */
678static int netlbladdr_seq_show(struct seq_file *s, void *v)
679{
Etienne Basset7198e2e2009-03-24 20:53:24 +0100680 struct list_head *list = v;
681 struct smk_netlbladdr *skp =
682 list_entry(list, struct smk_netlbladdr, list);
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500683 unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
etienne113a0e42009-03-04 07:33:51 +0100684 int maskn;
685 u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500686
etienne113a0e42009-03-04 07:33:51 +0100687 for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++);
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500688
689 seq_printf(s, "%u.%u.%u.%u/%d %s\n",
690 hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label);
691
692 return 0;
693}
694
695static void netlbladdr_seq_stop(struct seq_file *s, void *v)
696{
697 /* No-op */
698}
699
James Morris88e9d342009-09-22 16:43:43 -0700700static const struct seq_operations netlbladdr_seq_ops = {
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500701 .start = netlbladdr_seq_start,
702 .stop = netlbladdr_seq_stop,
703 .next = netlbladdr_seq_next,
704 .show = netlbladdr_seq_show,
705};
706
707/**
708 * smk_open_netlbladdr - open() for /smack/netlabel
709 * @inode: inode structure representing file
710 * @file: "netlabel" file pointer
711 *
712 * Connect our netlbladdr_seq_* operations with /smack/netlabel
713 * file_operations
714 */
715static int smk_open_netlbladdr(struct inode *inode, struct file *file)
716{
717 return seq_open(file, &netlbladdr_seq_ops);
718}
719
720/**
etienne113a0e42009-03-04 07:33:51 +0100721 * smk_netlbladdr_insert
722 * @new : netlabel to insert
723 *
724 * This helper insert netlabel in the smack_netlbladdrs list
725 * sorted by netmask length (longest to smallest)
Etienne Basset7198e2e2009-03-24 20:53:24 +0100726 * locked by &smk_netlbladdr_lock in smk_write_netlbladdr
727 *
etienne113a0e42009-03-04 07:33:51 +0100728 */
729static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
730{
Etienne Basset7198e2e2009-03-24 20:53:24 +0100731 struct smk_netlbladdr *m, *m_next;
etienne113a0e42009-03-04 07:33:51 +0100732
Etienne Basset7198e2e2009-03-24 20:53:24 +0100733 if (list_empty(&smk_netlbladdr_list)) {
734 list_add_rcu(&new->list, &smk_netlbladdr_list);
etienne113a0e42009-03-04 07:33:51 +0100735 return;
736 }
737
Jiri Pirko05725f72009-04-14 20:17:16 +0200738 m = list_entry_rcu(smk_netlbladdr_list.next,
739 struct smk_netlbladdr, list);
Etienne Basset7198e2e2009-03-24 20:53:24 +0100740
etienne113a0e42009-03-04 07:33:51 +0100741 /* the comparison '>' is a bit hacky, but works */
Etienne Basset7198e2e2009-03-24 20:53:24 +0100742 if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
743 list_add_rcu(&new->list, &smk_netlbladdr_list);
etienne113a0e42009-03-04 07:33:51 +0100744 return;
745 }
Etienne Basset7198e2e2009-03-24 20:53:24 +0100746
747 list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
748 if (list_is_last(&m->list, &smk_netlbladdr_list)) {
749 list_add_rcu(&new->list, &m->list);
etienne113a0e42009-03-04 07:33:51 +0100750 return;
751 }
Jiri Pirko05725f72009-04-14 20:17:16 +0200752 m_next = list_entry_rcu(m->list.next,
753 struct smk_netlbladdr, list);
Etienne Basset7198e2e2009-03-24 20:53:24 +0100754 if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
755 list_add_rcu(&new->list, &m->list);
etienne113a0e42009-03-04 07:33:51 +0100756 return;
757 }
758 }
759}
760
761
762/**
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500763 * smk_write_netlbladdr - write() for /smack/netlabel
Randy Dunlap251a2a92009-02-18 11:42:33 -0800764 * @file: file pointer, not actually used
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500765 * @buf: where to get the data from
766 * @count: bytes sent
767 * @ppos: where to start
768 *
769 * Accepts only one netlbladdr per write call.
770 * Returns number of bytes written or error code, as appropriate
771 */
772static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
773 size_t count, loff_t *ppos)
774{
775 struct smk_netlbladdr *skp;
776 struct sockaddr_in newname;
777 char smack[SMK_LABELLEN];
778 char *sp;
Roel Kluin6470c072009-05-21 18:42:54 +0200779 char data[SMK_NETLBLADDRMAX + 1];
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500780 char *host = (char *)&newname.sin_addr.s_addr;
781 int rc;
782 struct netlbl_audit audit_info;
783 struct in_addr mask;
784 unsigned int m;
Etienne Basset7198e2e2009-03-24 20:53:24 +0100785 int found;
etienne113a0e42009-03-04 07:33:51 +0100786 u32 mask_bits = (1<<31);
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500787 __be32 nsa;
etienne113a0e42009-03-04 07:33:51 +0100788 u32 temp_mask;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500789
790 /*
791 * Must have privilege.
792 * No partial writes.
793 * Enough data must be present.
794 * "<addr/mask, as a.b.c.d/e><space><label>"
795 * "<addr, as a.b.c.d><space><label>"
796 */
797 if (!capable(CAP_MAC_ADMIN))
798 return -EPERM;
799 if (*ppos != 0)
800 return -EINVAL;
801 if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX)
802 return -EINVAL;
803 if (copy_from_user(data, buf, count) != 0)
804 return -EFAULT;
805
806 data[count] = '\0';
807
808 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
809 &host[0], &host[1], &host[2], &host[3], &m, smack);
810 if (rc != 6) {
811 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
812 &host[0], &host[1], &host[2], &host[3], smack);
813 if (rc != 5)
814 return -EINVAL;
815 m = BEBITS;
816 }
817 if (m > BEBITS)
818 return -EINVAL;
819
Etienne Basset43031542009-03-27 17:11:01 -0400820 /* if smack begins with '-', its an option, don't import it */
821 if (smack[0] != '-') {
822 sp = smk_import(smack, 0);
823 if (sp == NULL)
824 return -EINVAL;
825 } else {
826 /* check known options */
827 if (strcmp(smack, smack_cipso_option) == 0)
828 sp = (char *)smack_cipso_option;
829 else
830 return -EINVAL;
831 }
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500832
etienne113a0e42009-03-04 07:33:51 +0100833 for (temp_mask = 0; m > 0; m--) {
834 temp_mask |= mask_bits;
835 mask_bits >>= 1;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500836 }
etienne113a0e42009-03-04 07:33:51 +0100837 mask.s_addr = cpu_to_be32(temp_mask);
838
839 newname.sin_addr.s_addr &= mask.s_addr;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500840 /*
841 * Only allow one writer at a time. Writes should be
842 * quite rare and small in any case.
843 */
844 mutex_lock(&smk_netlbladdr_lock);
845
846 nsa = newname.sin_addr.s_addr;
etienne113a0e42009-03-04 07:33:51 +0100847 /* try to find if the prefix is already in the list */
Etienne Basset7198e2e2009-03-24 20:53:24 +0100848 found = 0;
849 list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) {
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500850 if (skp->smk_host.sin_addr.s_addr == nsa &&
Etienne Basset7198e2e2009-03-24 20:53:24 +0100851 skp->smk_mask.s_addr == mask.s_addr) {
852 found = 1;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500853 break;
Etienne Basset7198e2e2009-03-24 20:53:24 +0100854 }
855 }
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500856 smk_netlabel_audit_set(&audit_info);
857
Etienne Basset7198e2e2009-03-24 20:53:24 +0100858 if (found == 0) {
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500859 skp = kzalloc(sizeof(*skp), GFP_KERNEL);
860 if (skp == NULL)
861 rc = -ENOMEM;
862 else {
863 rc = 0;
864 skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
865 skp->smk_mask.s_addr = mask.s_addr;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500866 skp->smk_label = sp;
etienne113a0e42009-03-04 07:33:51 +0100867 smk_netlbladdr_insert(skp);
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500868 }
869 } else {
Etienne Basset43031542009-03-27 17:11:01 -0400870 /* we delete the unlabeled entry, only if the previous label
871 * wasnt the special CIPSO option */
872 if (skp->smk_label != smack_cipso_option)
873 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
874 &skp->smk_host.sin_addr, &skp->smk_mask,
875 PF_INET, &audit_info);
876 else
877 rc = 0;
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500878 skp->smk_label = sp;
879 }
880
881 /*
882 * Now tell netlabel about the single label nature of
883 * this host so that incoming packets get labeled.
Etienne Basset43031542009-03-27 17:11:01 -0400884 * but only if we didn't get the special CIPSO option
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500885 */
Etienne Basset43031542009-03-27 17:11:01 -0400886 if (rc == 0 && sp != smack_cipso_option)
Casey Schaufler6d3dc072008-12-31 12:54:12 -0500887 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
888 &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
889 smack_to_secid(skp->smk_label), &audit_info);
890
891 if (rc == 0)
892 rc = count;
893
894 mutex_unlock(&smk_netlbladdr_lock);
895
896 return rc;
897}
898
899static const struct file_operations smk_netlbladdr_ops = {
900 .open = smk_open_netlbladdr,
901 .read = seq_read,
902 .llseek = seq_lseek,
903 .write = smk_write_netlbladdr,
904 .release = seq_release,
905};
906
Casey Schauflere114e472008-02-04 22:29:50 -0800907/**
908 * smk_read_doi - read() for /smack/doi
909 * @filp: file pointer, not actually used
910 * @buf: where to put the result
911 * @count: maximum to send along
912 * @ppos: where to start
913 *
914 * Returns number of bytes read or error code, as appropriate
915 */
916static ssize_t smk_read_doi(struct file *filp, char __user *buf,
917 size_t count, loff_t *ppos)
918{
919 char temp[80];
920 ssize_t rc;
921
922 if (*ppos != 0)
923 return 0;
924
925 sprintf(temp, "%d", smk_cipso_doi_value);
926 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
927
928 return rc;
929}
930
931/**
932 * smk_write_doi - write() for /smack/doi
Randy Dunlap251a2a92009-02-18 11:42:33 -0800933 * @file: file pointer, not actually used
Casey Schauflere114e472008-02-04 22:29:50 -0800934 * @buf: where to get the data from
935 * @count: bytes sent
936 * @ppos: where to start
937 *
938 * Returns number of bytes written or error code, as appropriate
939 */
940static ssize_t smk_write_doi(struct file *file, const char __user *buf,
941 size_t count, loff_t *ppos)
942{
943 char temp[80];
944 int i;
945
946 if (!capable(CAP_MAC_ADMIN))
947 return -EPERM;
948
949 if (count >= sizeof(temp) || count == 0)
950 return -EINVAL;
951
952 if (copy_from_user(temp, buf, count) != 0)
953 return -EFAULT;
954
955 temp[count] = '\0';
956
957 if (sscanf(temp, "%d", &i) != 1)
958 return -EINVAL;
959
960 smk_cipso_doi_value = i;
961
962 smk_cipso_doi();
963
964 return count;
965}
966
967static const struct file_operations smk_doi_ops = {
968 .read = smk_read_doi,
969 .write = smk_write_doi,
970};
971
972/**
973 * smk_read_direct - read() for /smack/direct
974 * @filp: file pointer, not actually used
975 * @buf: where to put the result
976 * @count: maximum to send along
977 * @ppos: where to start
978 *
979 * Returns number of bytes read or error code, as appropriate
980 */
981static ssize_t smk_read_direct(struct file *filp, char __user *buf,
982 size_t count, loff_t *ppos)
983{
984 char temp[80];
985 ssize_t rc;
986
987 if (*ppos != 0)
988 return 0;
989
990 sprintf(temp, "%d", smack_cipso_direct);
991 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
992
993 return rc;
994}
995
996/**
997 * smk_write_direct - write() for /smack/direct
Randy Dunlap251a2a92009-02-18 11:42:33 -0800998 * @file: file pointer, not actually used
Casey Schauflere114e472008-02-04 22:29:50 -0800999 * @buf: where to get the data from
1000 * @count: bytes sent
1001 * @ppos: where to start
1002 *
1003 * Returns number of bytes written or error code, as appropriate
1004 */
1005static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1006 size_t count, loff_t *ppos)
1007{
1008 char temp[80];
1009 int i;
1010
1011 if (!capable(CAP_MAC_ADMIN))
1012 return -EPERM;
1013
1014 if (count >= sizeof(temp) || count == 0)
1015 return -EINVAL;
1016
1017 if (copy_from_user(temp, buf, count) != 0)
1018 return -EFAULT;
1019
1020 temp[count] = '\0';
1021
1022 if (sscanf(temp, "%d", &i) != 1)
1023 return -EINVAL;
1024
1025 smack_cipso_direct = i;
1026
1027 return count;
1028}
1029
1030static const struct file_operations smk_direct_ops = {
1031 .read = smk_read_direct,
1032 .write = smk_write_direct,
1033};
1034
1035/**
1036 * smk_read_ambient - read() for /smack/ambient
1037 * @filp: file pointer, not actually used
1038 * @buf: where to put the result
1039 * @cn: maximum to send along
1040 * @ppos: where to start
1041 *
1042 * Returns number of bytes read or error code, as appropriate
1043 */
1044static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1045 size_t cn, loff_t *ppos)
1046{
1047 ssize_t rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001048 int asize;
1049
1050 if (*ppos != 0)
1051 return 0;
1052 /*
1053 * Being careful to avoid a problem in the case where
1054 * smack_net_ambient gets changed in midstream.
Casey Schauflere114e472008-02-04 22:29:50 -08001055 */
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001056 mutex_lock(&smack_ambient_lock);
Casey Schauflere114e472008-02-04 22:29:50 -08001057
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001058 asize = strlen(smack_net_ambient) + 1;
Casey Schauflere114e472008-02-04 22:29:50 -08001059
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001060 if (cn >= asize)
1061 rc = simple_read_from_buffer(buf, cn, ppos,
1062 smack_net_ambient, asize);
1063 else
1064 rc = -EINVAL;
1065
1066 mutex_unlock(&smack_ambient_lock);
Casey Schauflere114e472008-02-04 22:29:50 -08001067
1068 return rc;
1069}
1070
1071/**
1072 * smk_write_ambient - write() for /smack/ambient
Randy Dunlap251a2a92009-02-18 11:42:33 -08001073 * @file: file pointer, not actually used
Casey Schauflere114e472008-02-04 22:29:50 -08001074 * @buf: where to get the data from
1075 * @count: bytes sent
1076 * @ppos: where to start
1077 *
1078 * Returns number of bytes written or error code, as appropriate
1079 */
1080static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1081 size_t count, loff_t *ppos)
1082{
1083 char in[SMK_LABELLEN];
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001084 char *oldambient;
Casey Schauflere114e472008-02-04 22:29:50 -08001085 char *smack;
1086
1087 if (!capable(CAP_MAC_ADMIN))
1088 return -EPERM;
1089
1090 if (count >= SMK_LABELLEN)
1091 return -EINVAL;
1092
1093 if (copy_from_user(in, buf, count) != 0)
1094 return -EFAULT;
1095
1096 smack = smk_import(in, count);
1097 if (smack == NULL)
1098 return -EINVAL;
1099
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001100 mutex_lock(&smack_ambient_lock);
1101
1102 oldambient = smack_net_ambient;
Casey Schauflere114e472008-02-04 22:29:50 -08001103 smack_net_ambient = smack;
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001104 smk_unlbl_ambient(oldambient);
1105
1106 mutex_unlock(&smack_ambient_lock);
Casey Schauflere114e472008-02-04 22:29:50 -08001107
1108 return count;
1109}
1110
1111static const struct file_operations smk_ambient_ops = {
1112 .read = smk_read_ambient,
1113 .write = smk_write_ambient,
1114};
1115
Casey Schaufler15446232008-07-30 15:37:11 -07001116/**
1117 * smk_read_onlycap - read() for /smack/onlycap
1118 * @filp: file pointer, not actually used
1119 * @buf: where to put the result
1120 * @cn: maximum to send along
1121 * @ppos: where to start
1122 *
1123 * Returns number of bytes read or error code, as appropriate
1124 */
1125static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
1126 size_t cn, loff_t *ppos)
1127{
1128 char *smack = "";
1129 ssize_t rc = -EINVAL;
1130 int asize;
1131
1132 if (*ppos != 0)
1133 return 0;
1134
1135 if (smack_onlycap != NULL)
1136 smack = smack_onlycap;
1137
1138 asize = strlen(smack) + 1;
1139
1140 if (cn >= asize)
1141 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
1142
1143 return rc;
1144}
1145
1146/**
1147 * smk_write_onlycap - write() for /smack/onlycap
Randy Dunlap251a2a92009-02-18 11:42:33 -08001148 * @file: file pointer, not actually used
Casey Schaufler15446232008-07-30 15:37:11 -07001149 * @buf: where to get the data from
1150 * @count: bytes sent
1151 * @ppos: where to start
1152 *
1153 * Returns number of bytes written or error code, as appropriate
1154 */
1155static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1156 size_t count, loff_t *ppos)
1157{
1158 char in[SMK_LABELLEN];
David Howellsb6dff3e2008-11-14 10:39:16 +11001159 char *sp = current->cred->security;
Casey Schaufler15446232008-07-30 15:37:11 -07001160
1161 if (!capable(CAP_MAC_ADMIN))
1162 return -EPERM;
1163
1164 /*
1165 * This can be done using smk_access() but is done
1166 * explicitly for clarity. The smk_access() implementation
1167 * would use smk_access(smack_onlycap, MAY_WRITE)
1168 */
1169 if (smack_onlycap != NULL && smack_onlycap != sp)
1170 return -EPERM;
1171
1172 if (count >= SMK_LABELLEN)
1173 return -EINVAL;
1174
1175 if (copy_from_user(in, buf, count) != 0)
1176 return -EFAULT;
1177
1178 /*
1179 * Should the null string be passed in unset the onlycap value.
1180 * This seems like something to be careful with as usually
1181 * smk_import only expects to return NULL for errors. It
1182 * is usually the case that a nullstring or "\n" would be
1183 * bad to pass to smk_import but in fact this is useful here.
1184 */
1185 smack_onlycap = smk_import(in, count);
1186
1187 return count;
1188}
1189
1190static const struct file_operations smk_onlycap_ops = {
1191 .read = smk_read_onlycap,
1192 .write = smk_write_onlycap,
1193};
1194
Casey Schauflere114e472008-02-04 22:29:50 -08001195/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02001196 * smk_read_logging - read() for /smack/logging
1197 * @filp: file pointer, not actually used
1198 * @buf: where to put the result
1199 * @cn: maximum to send along
1200 * @ppos: where to start
1201 *
1202 * Returns number of bytes read or error code, as appropriate
1203 */
1204static ssize_t smk_read_logging(struct file *filp, char __user *buf,
1205 size_t count, loff_t *ppos)
1206{
1207 char temp[32];
1208 ssize_t rc;
1209
1210 if (*ppos != 0)
1211 return 0;
1212
1213 sprintf(temp, "%d\n", log_policy);
1214 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1215 return rc;
1216}
1217
1218/**
1219 * smk_write_logging - write() for /smack/logging
1220 * @file: file pointer, not actually used
1221 * @buf: where to get the data from
1222 * @count: bytes sent
1223 * @ppos: where to start
1224 *
1225 * Returns number of bytes written or error code, as appropriate
1226 */
1227static ssize_t smk_write_logging(struct file *file, const char __user *buf,
1228 size_t count, loff_t *ppos)
1229{
1230 char temp[32];
1231 int i;
1232
1233 if (!capable(CAP_MAC_ADMIN))
1234 return -EPERM;
1235
1236 if (count >= sizeof(temp) || count == 0)
1237 return -EINVAL;
1238
1239 if (copy_from_user(temp, buf, count) != 0)
1240 return -EFAULT;
1241
1242 temp[count] = '\0';
1243
1244 if (sscanf(temp, "%d", &i) != 1)
1245 return -EINVAL;
1246 if (i < 0 || i > 3)
1247 return -EINVAL;
1248 log_policy = i;
1249 return count;
1250}
1251
1252
1253
1254static const struct file_operations smk_logging_ops = {
1255 .read = smk_read_logging,
1256 .write = smk_write_logging,
1257};
1258/**
Casey Schauflere114e472008-02-04 22:29:50 -08001259 * smk_fill_super - fill the /smackfs superblock
1260 * @sb: the empty superblock
1261 * @data: unused
1262 * @silent: unused
1263 *
1264 * Fill in the well known entries for /smack
1265 *
1266 * Returns 0 on success, an error code on failure
1267 */
1268static int smk_fill_super(struct super_block *sb, void *data, int silent)
1269{
1270 int rc;
1271 struct inode *root_inode;
1272
1273 static struct tree_descr smack_files[] = {
1274 [SMK_LOAD] =
1275 {"load", &smk_load_ops, S_IRUGO|S_IWUSR},
1276 [SMK_CIPSO] =
1277 {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
1278 [SMK_DOI] =
1279 {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
1280 [SMK_DIRECT] =
1281 {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
1282 [SMK_AMBIENT] =
1283 {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001284 [SMK_NETLBLADDR] =
1285 {"netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
Casey Schaufler15446232008-07-30 15:37:11 -07001286 [SMK_ONLYCAP] =
1287 {"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
Etienne Bassetecfcc532009-04-08 20:40:06 +02001288 [SMK_LOGGING] =
1289 {"logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
Casey Schauflere114e472008-02-04 22:29:50 -08001290 /* last one */ {""}
1291 };
1292
1293 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
1294 if (rc != 0) {
1295 printk(KERN_ERR "%s failed %d while creating inodes\n",
1296 __func__, rc);
1297 return rc;
1298 }
1299
1300 root_inode = sb->s_root->d_inode;
1301 root_inode->i_security = new_inode_smack(smack_known_floor.smk_known);
1302
1303 return 0;
1304}
1305
1306/**
1307 * smk_get_sb - get the smackfs superblock
1308 * @fs_type: passed along without comment
1309 * @flags: passed along without comment
1310 * @dev_name: passed along without comment
1311 * @data: passed along without comment
1312 * @mnt: passed along without comment
1313 *
1314 * Just passes everything along.
1315 *
1316 * Returns what the lower level code does.
1317 */
1318static int smk_get_sb(struct file_system_type *fs_type,
1319 int flags, const char *dev_name, void *data,
1320 struct vfsmount *mnt)
1321{
1322 return get_sb_single(fs_type, flags, data, smk_fill_super, mnt);
1323}
1324
1325static struct file_system_type smk_fs_type = {
1326 .name = "smackfs",
1327 .get_sb = smk_get_sb,
1328 .kill_sb = kill_litter_super,
1329};
1330
1331static struct vfsmount *smackfs_mount;
1332
1333/**
1334 * init_smk_fs - get the smackfs superblock
1335 *
1336 * register the smackfs
1337 *
Ahmed S. Darwish076c54c2008-03-06 18:09:10 +02001338 * Do not register smackfs if Smack wasn't enabled
1339 * on boot. We can not put this method normally under the
1340 * smack_init() code path since the security subsystem get
1341 * initialized before the vfs caches.
1342 *
1343 * Returns true if we were not chosen on boot or if
1344 * we were chosen and filesystem registration succeeded.
Casey Schauflere114e472008-02-04 22:29:50 -08001345 */
1346static int __init init_smk_fs(void)
1347{
1348 int err;
1349
Ahmed S. Darwish076c54c2008-03-06 18:09:10 +02001350 if (!security_module_enable(&smack_ops))
1351 return 0;
1352
Casey Schauflere114e472008-02-04 22:29:50 -08001353 err = register_filesystem(&smk_fs_type);
1354 if (!err) {
1355 smackfs_mount = kern_mount(&smk_fs_type);
1356 if (IS_ERR(smackfs_mount)) {
1357 printk(KERN_ERR "smackfs: could not mount!\n");
1358 err = PTR_ERR(smackfs_mount);
1359 smackfs_mount = NULL;
1360 }
1361 }
1362
Casey Schauflere114e472008-02-04 22:29:50 -08001363 smk_cipso_doi();
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001364 smk_unlbl_ambient(NULL);
Casey Schauflere114e472008-02-04 22:29:50 -08001365
1366 return err;
1367}
1368
1369__initcall(init_smk_fs);