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Casey Schauflere114e472008-02-04 22:29:50 -08001/*
2 * Simplified MAC Kernel (smack) security module
3 *
4 * This file contains the smack hook function implementations.
5 *
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02006 * Authors:
Casey Schauflere114e472008-02-04 22:29:50 -08007 * Casey Schaufler <casey@schaufler-ca.com>
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +03008 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Casey Schauflere114e472008-02-04 22:29:50 -08009 *
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
Paul Moore07feee82009-03-27 17:10:54 -040011 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
Paul Moore82c21bf2011-08-01 11:10:33 +000012 * Paul Moore <paul@paul-moore.com>
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +020013 * Copyright (C) 2010 Nokia Corporation
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +030014 * Copyright (C) 2011 Intel Corporation.
Casey Schauflere114e472008-02-04 22:29:50 -080015 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
19 */
20
21#include <linux/xattr.h>
22#include <linux/pagemap.h>
23#include <linux/mount.h>
24#include <linux/stat.h>
Casey Schauflere114e472008-02-04 22:29:50 -080025#include <linux/kd.h>
26#include <asm/ioctls.h>
Paul Moore07feee82009-03-27 17:10:54 -040027#include <linux/ip.h>
Casey Schauflere114e472008-02-04 22:29:50 -080028#include <linux/tcp.h>
29#include <linux/udp.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090030#include <linux/slab.h>
Casey Schauflere114e472008-02-04 22:29:50 -080031#include <linux/mutex.h>
32#include <linux/pipe_fs_i.h>
Casey Schauflere114e472008-02-04 22:29:50 -080033#include <net/cipso_ipv4.h>
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +100034#include <linux/audit.h>
Nick Black1fd7317d2009-09-22 16:43:33 -070035#include <linux/magic.h>
Eric Paris2a7dba32011-02-01 11:05:39 -050036#include <linux/dcache.h>
Jarkko Sakkinen16014d82011-10-14 13:16:24 +030037#include <linux/personality.h>
Al Viro40401532012-02-13 03:58:52 +000038#include <linux/msg.h>
39#include <linux/shm.h>
40#include <linux/binfmts.h>
Casey Schauflere114e472008-02-04 22:29:50 -080041#include "smack.h"
42
David Howellsc69e8d92008-11-14 10:39:19 +110043#define task_security(task) (task_cred_xxx((task), security))
44
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +020045#define TRANS_TRUE "TRUE"
46#define TRANS_TRUE_SIZE 4
47
Casey Schauflere114e472008-02-04 22:29:50 -080048/**
49 * smk_fetch - Fetch the smack label from a file.
50 * @ip: a pointer to the inode
51 * @dp: a pointer to the dentry
52 *
53 * Returns a pointer to the master list entry for the Smack label
54 * or NULL if there was no label to fetch.
55 */
Casey Schaufler676dac42010-12-02 06:43:39 -080056static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp)
Casey Schauflere114e472008-02-04 22:29:50 -080057{
58 int rc;
Casey Schauflerf7112e62012-05-06 15:22:02 -070059 char *buffer;
60 char *result = NULL;
Casey Schauflere114e472008-02-04 22:29:50 -080061
62 if (ip->i_op->getxattr == NULL)
63 return NULL;
64
Casey Schauflerf7112e62012-05-06 15:22:02 -070065 buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
66 if (buffer == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -080067 return NULL;
68
Casey Schauflerf7112e62012-05-06 15:22:02 -070069 rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
70 if (rc > 0)
71 result = smk_import(buffer, rc);
72
73 kfree(buffer);
74
75 return result;
Casey Schauflere114e472008-02-04 22:29:50 -080076}
77
78/**
79 * new_inode_smack - allocate an inode security blob
80 * @smack: a pointer to the Smack label to use in the blob
81 *
82 * Returns the new blob or NULL if there's no memory available
83 */
84struct inode_smack *new_inode_smack(char *smack)
85{
86 struct inode_smack *isp;
87
Tetsuo Handaceffec552012-03-29 16:19:05 +090088 isp = kzalloc(sizeof(struct inode_smack), GFP_NOFS);
Casey Schauflere114e472008-02-04 22:29:50 -080089 if (isp == NULL)
90 return NULL;
91
92 isp->smk_inode = smack;
93 isp->smk_flags = 0;
94 mutex_init(&isp->smk_lock);
95
96 return isp;
97}
98
Casey Schaufler7898e1f2011-01-17 08:05:27 -080099/**
100 * new_task_smack - allocate a task security blob
101 * @smack: a pointer to the Smack label to use in the blob
102 *
103 * Returns the new blob or NULL if there's no memory available
104 */
105static struct task_smack *new_task_smack(char *task, char *forked, gfp_t gfp)
106{
107 struct task_smack *tsp;
108
109 tsp = kzalloc(sizeof(struct task_smack), gfp);
110 if (tsp == NULL)
111 return NULL;
112
113 tsp->smk_task = task;
114 tsp->smk_forked = forked;
115 INIT_LIST_HEAD(&tsp->smk_rules);
116 mutex_init(&tsp->smk_rules_lock);
117
118 return tsp;
119}
120
121/**
122 * smk_copy_rules - copy a rule set
123 * @nhead - new rules header pointer
124 * @ohead - old rules header pointer
125 *
126 * Returns 0 on success, -ENOMEM on error
127 */
128static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
129 gfp_t gfp)
130{
131 struct smack_rule *nrp;
132 struct smack_rule *orp;
133 int rc = 0;
134
135 INIT_LIST_HEAD(nhead);
136
137 list_for_each_entry_rcu(orp, ohead, list) {
138 nrp = kzalloc(sizeof(struct smack_rule), gfp);
139 if (nrp == NULL) {
140 rc = -ENOMEM;
141 break;
142 }
143 *nrp = *orp;
144 list_add_rcu(&nrp->list, nhead);
145 }
146 return rc;
147}
148
Casey Schauflere114e472008-02-04 22:29:50 -0800149/*
150 * LSM hooks.
151 * We he, that is fun!
152 */
153
154/**
Ingo Molnar9e488582009-05-07 19:26:19 +1000155 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
Casey Schauflere114e472008-02-04 22:29:50 -0800156 * @ctp: child task pointer
Randy Dunlap251a2a92009-02-18 11:42:33 -0800157 * @mode: ptrace attachment mode
Casey Schauflere114e472008-02-04 22:29:50 -0800158 *
159 * Returns 0 if access is OK, an error code otherwise
160 *
161 * Do the capability checks, and require read and write.
162 */
Ingo Molnar9e488582009-05-07 19:26:19 +1000163static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
Casey Schauflere114e472008-02-04 22:29:50 -0800164{
165 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200166 struct smk_audit_info ad;
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800167 char *tsp;
Casey Schauflere114e472008-02-04 22:29:50 -0800168
Ingo Molnar9e488582009-05-07 19:26:19 +1000169 rc = cap_ptrace_access_check(ctp, mode);
Casey Schauflere114e472008-02-04 22:29:50 -0800170 if (rc != 0)
171 return rc;
172
Casey Schaufler676dac42010-12-02 06:43:39 -0800173 tsp = smk_of_task(task_security(ctp));
Etienne Bassetecfcc532009-04-08 20:40:06 +0200174 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
175 smk_ad_setfield_u_tsk(&ad, ctp);
176
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800177 rc = smk_curacc(tsp, MAY_READWRITE, &ad);
David Howells5cd9c582008-08-14 11:37:28 +0100178 return rc;
179}
Casey Schauflere114e472008-02-04 22:29:50 -0800180
David Howells5cd9c582008-08-14 11:37:28 +0100181/**
182 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
183 * @ptp: parent task pointer
184 *
185 * Returns 0 if access is OK, an error code otherwise
186 *
187 * Do the capability checks, and require read and write.
188 */
189static int smack_ptrace_traceme(struct task_struct *ptp)
190{
191 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200192 struct smk_audit_info ad;
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800193 char *tsp;
David Howells5cd9c582008-08-14 11:37:28 +0100194
195 rc = cap_ptrace_traceme(ptp);
196 if (rc != 0)
197 return rc;
198
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800199 tsp = smk_of_task(task_security(ptp));
Etienne Bassetecfcc532009-04-08 20:40:06 +0200200 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
201 smk_ad_setfield_u_tsk(&ad, ptp);
202
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800203 rc = smk_curacc(tsp, MAY_READWRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800204 return rc;
205}
206
207/**
208 * smack_syslog - Smack approval on syslog
209 * @type: message type
210 *
211 * Require that the task has the floor label
212 *
213 * Returns 0 on success, error code otherwise.
214 */
Eric Paris12b30522010-11-15 18:36:29 -0500215static int smack_syslog(int typefrom_file)
Casey Schauflere114e472008-02-04 22:29:50 -0800216{
Eric Paris12b30522010-11-15 18:36:29 -0500217 int rc = 0;
Casey Schaufler676dac42010-12-02 06:43:39 -0800218 char *sp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -0800219
Casey Schauflere114e472008-02-04 22:29:50 -0800220 if (capable(CAP_MAC_OVERRIDE))
221 return 0;
222
223 if (sp != smack_known_floor.smk_known)
224 rc = -EACCES;
225
226 return rc;
227}
228
229
230/*
231 * Superblock Hooks.
232 */
233
234/**
235 * smack_sb_alloc_security - allocate a superblock blob
236 * @sb: the superblock getting the blob
237 *
238 * Returns 0 on success or -ENOMEM on error.
239 */
240static int smack_sb_alloc_security(struct super_block *sb)
241{
242 struct superblock_smack *sbsp;
243
244 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
245
246 if (sbsp == NULL)
247 return -ENOMEM;
248
249 sbsp->smk_root = smack_known_floor.smk_known;
250 sbsp->smk_default = smack_known_floor.smk_known;
251 sbsp->smk_floor = smack_known_floor.smk_known;
252 sbsp->smk_hat = smack_known_hat.smk_known;
253 sbsp->smk_initialized = 0;
254 spin_lock_init(&sbsp->smk_sblock);
255
256 sb->s_security = sbsp;
257
258 return 0;
259}
260
261/**
262 * smack_sb_free_security - free a superblock blob
263 * @sb: the superblock getting the blob
264 *
265 */
266static void smack_sb_free_security(struct super_block *sb)
267{
268 kfree(sb->s_security);
269 sb->s_security = NULL;
270}
271
272/**
273 * smack_sb_copy_data - copy mount options data for processing
Casey Schauflere114e472008-02-04 22:29:50 -0800274 * @orig: where to start
Randy Dunlap251a2a92009-02-18 11:42:33 -0800275 * @smackopts: mount options string
Casey Schauflere114e472008-02-04 22:29:50 -0800276 *
277 * Returns 0 on success or -ENOMEM on error.
278 *
279 * Copy the Smack specific mount options out of the mount
280 * options list.
281 */
Eric Parise0007522008-03-05 10:31:54 -0500282static int smack_sb_copy_data(char *orig, char *smackopts)
Casey Schauflere114e472008-02-04 22:29:50 -0800283{
284 char *cp, *commap, *otheropts, *dp;
285
Casey Schauflere114e472008-02-04 22:29:50 -0800286 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
287 if (otheropts == NULL)
288 return -ENOMEM;
289
290 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
291 if (strstr(cp, SMK_FSDEFAULT) == cp)
292 dp = smackopts;
293 else if (strstr(cp, SMK_FSFLOOR) == cp)
294 dp = smackopts;
295 else if (strstr(cp, SMK_FSHAT) == cp)
296 dp = smackopts;
297 else if (strstr(cp, SMK_FSROOT) == cp)
298 dp = smackopts;
299 else
300 dp = otheropts;
301
302 commap = strchr(cp, ',');
303 if (commap != NULL)
304 *commap = '\0';
305
306 if (*dp != '\0')
307 strcat(dp, ",");
308 strcat(dp, cp);
309 }
310
311 strcpy(orig, otheropts);
312 free_page((unsigned long)otheropts);
313
314 return 0;
315}
316
317/**
318 * smack_sb_kern_mount - Smack specific mount processing
319 * @sb: the file system superblock
James Morris12204e22008-12-19 10:44:42 +1100320 * @flags: the mount flags
Casey Schauflere114e472008-02-04 22:29:50 -0800321 * @data: the smack mount options
322 *
323 * Returns 0 on success, an error code on failure
324 */
James Morris12204e22008-12-19 10:44:42 +1100325static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
Casey Schauflere114e472008-02-04 22:29:50 -0800326{
327 struct dentry *root = sb->s_root;
328 struct inode *inode = root->d_inode;
329 struct superblock_smack *sp = sb->s_security;
330 struct inode_smack *isp;
331 char *op;
332 char *commap;
333 char *nsp;
334
335 spin_lock(&sp->smk_sblock);
336 if (sp->smk_initialized != 0) {
337 spin_unlock(&sp->smk_sblock);
338 return 0;
339 }
340 sp->smk_initialized = 1;
341 spin_unlock(&sp->smk_sblock);
342
343 for (op = data; op != NULL; op = commap) {
344 commap = strchr(op, ',');
345 if (commap != NULL)
346 *commap++ = '\0';
347
348 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
349 op += strlen(SMK_FSHAT);
350 nsp = smk_import(op, 0);
351 if (nsp != NULL)
352 sp->smk_hat = nsp;
353 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
354 op += strlen(SMK_FSFLOOR);
355 nsp = smk_import(op, 0);
356 if (nsp != NULL)
357 sp->smk_floor = nsp;
358 } else if (strncmp(op, SMK_FSDEFAULT,
359 strlen(SMK_FSDEFAULT)) == 0) {
360 op += strlen(SMK_FSDEFAULT);
361 nsp = smk_import(op, 0);
362 if (nsp != NULL)
363 sp->smk_default = nsp;
364 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
365 op += strlen(SMK_FSROOT);
366 nsp = smk_import(op, 0);
367 if (nsp != NULL)
368 sp->smk_root = nsp;
369 }
370 }
371
372 /*
373 * Initialize the root inode.
374 */
375 isp = inode->i_security;
376 if (isp == NULL)
377 inode->i_security = new_inode_smack(sp->smk_root);
378 else
379 isp->smk_inode = sp->smk_root;
380
381 return 0;
382}
383
384/**
385 * smack_sb_statfs - Smack check on statfs
386 * @dentry: identifies the file system in question
387 *
388 * Returns 0 if current can read the floor of the filesystem,
389 * and error code otherwise
390 */
391static int smack_sb_statfs(struct dentry *dentry)
392{
393 struct superblock_smack *sbp = dentry->d_sb->s_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200394 int rc;
395 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800396
Eric Parisa2694342011-04-25 13:10:27 -0400397 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200398 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
399
400 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
401 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -0800402}
403
404/**
405 * smack_sb_mount - Smack check for mounting
406 * @dev_name: unused
Randy Dunlap251a2a92009-02-18 11:42:33 -0800407 * @path: mount point
Casey Schauflere114e472008-02-04 22:29:50 -0800408 * @type: unused
409 * @flags: unused
410 * @data: unused
411 *
412 * Returns 0 if current can write the floor of the filesystem
413 * being mounted on, an error code otherwise.
414 */
Al Virob5266eb2008-03-22 17:48:24 -0400415static int smack_sb_mount(char *dev_name, struct path *path,
Casey Schauflere114e472008-02-04 22:29:50 -0800416 char *type, unsigned long flags, void *data)
417{
Al Virod8c95842011-12-07 18:16:57 -0500418 struct superblock_smack *sbp = path->dentry->d_sb->s_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200419 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800420
Eric Parisf48b7392011-04-25 12:54:27 -0400421 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200422 smk_ad_setfield_u_fs_path(&ad, *path);
423
424 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800425}
426
427/**
428 * smack_sb_umount - Smack check for unmounting
429 * @mnt: file system to unmount
430 * @flags: unused
431 *
432 * Returns 0 if current can write the floor of the filesystem
433 * being unmounted, an error code otherwise.
434 */
435static int smack_sb_umount(struct vfsmount *mnt, int flags)
436{
437 struct superblock_smack *sbp;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200438 struct smk_audit_info ad;
Eric Parisa2694342011-04-25 13:10:27 -0400439 struct path path;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200440
Eric Parisa2694342011-04-25 13:10:27 -0400441 path.dentry = mnt->mnt_root;
442 path.mnt = mnt;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200443
Eric Parisf48b7392011-04-25 12:54:27 -0400444 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
Eric Parisa2694342011-04-25 13:10:27 -0400445 smk_ad_setfield_u_fs_path(&ad, path);
Casey Schauflere114e472008-02-04 22:29:50 -0800446
Al Virod8c95842011-12-07 18:16:57 -0500447 sbp = path.dentry->d_sb->s_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200448 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800449}
450
451/*
Casey Schaufler676dac42010-12-02 06:43:39 -0800452 * BPRM hooks
453 */
454
Casey Schauflerce8a4322011-09-29 18:21:01 -0700455/**
456 * smack_bprm_set_creds - set creds for exec
457 * @bprm: the exec information
458 *
459 * Returns 0 if it gets a blob, -ENOMEM otherwise
460 */
Casey Schaufler676dac42010-12-02 06:43:39 -0800461static int smack_bprm_set_creds(struct linux_binprm *bprm)
462{
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300463 struct inode *inode = bprm->file->f_path.dentry->d_inode;
464 struct task_smack *bsp = bprm->cred->security;
Casey Schaufler676dac42010-12-02 06:43:39 -0800465 struct inode_smack *isp;
Casey Schaufler676dac42010-12-02 06:43:39 -0800466 int rc;
467
468 rc = cap_bprm_set_creds(bprm);
469 if (rc != 0)
470 return rc;
471
472 if (bprm->cred_prepared)
473 return 0;
474
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300475 isp = inode->i_security;
476 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
Casey Schaufler676dac42010-12-02 06:43:39 -0800477 return 0;
478
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300479 if (bprm->unsafe)
480 return -EPERM;
Casey Schaufler676dac42010-12-02 06:43:39 -0800481
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300482 bsp->smk_task = isp->smk_task;
483 bprm->per_clear |= PER_CLEAR_ON_SETID;
Casey Schaufler676dac42010-12-02 06:43:39 -0800484
485 return 0;
486}
487
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300488/**
489 * smack_bprm_committing_creds - Prepare to install the new credentials
490 * from bprm.
491 *
492 * @bprm: binprm for exec
493 */
494static void smack_bprm_committing_creds(struct linux_binprm *bprm)
495{
496 struct task_smack *bsp = bprm->cred->security;
497
498 if (bsp->smk_task != bsp->smk_forked)
499 current->pdeath_signal = 0;
500}
501
502/**
503 * smack_bprm_secureexec - Return the decision to use secureexec.
504 * @bprm: binprm for exec
505 *
506 * Returns 0 on success.
507 */
508static int smack_bprm_secureexec(struct linux_binprm *bprm)
509{
510 struct task_smack *tsp = current_security();
511 int ret = cap_bprm_secureexec(bprm);
512
513 if (!ret && (tsp->smk_task != tsp->smk_forked))
514 ret = 1;
515
516 return ret;
517}
518
Casey Schaufler676dac42010-12-02 06:43:39 -0800519/*
Casey Schauflere114e472008-02-04 22:29:50 -0800520 * Inode hooks
521 */
522
523/**
524 * smack_inode_alloc_security - allocate an inode blob
Randy Dunlap251a2a92009-02-18 11:42:33 -0800525 * @inode: the inode in need of a blob
Casey Schauflere114e472008-02-04 22:29:50 -0800526 *
527 * Returns 0 if it gets a blob, -ENOMEM otherwise
528 */
529static int smack_inode_alloc_security(struct inode *inode)
530{
Casey Schaufler676dac42010-12-02 06:43:39 -0800531 inode->i_security = new_inode_smack(smk_of_current());
Casey Schauflere114e472008-02-04 22:29:50 -0800532 if (inode->i_security == NULL)
533 return -ENOMEM;
534 return 0;
535}
536
537/**
538 * smack_inode_free_security - free an inode blob
Randy Dunlap251a2a92009-02-18 11:42:33 -0800539 * @inode: the inode with a blob
Casey Schauflere114e472008-02-04 22:29:50 -0800540 *
541 * Clears the blob pointer in inode
542 */
543static void smack_inode_free_security(struct inode *inode)
544{
545 kfree(inode->i_security);
546 inode->i_security = NULL;
547}
548
549/**
550 * smack_inode_init_security - copy out the smack from an inode
551 * @inode: the inode
552 * @dir: unused
Eric Paris2a7dba32011-02-01 11:05:39 -0500553 * @qstr: unused
Casey Schauflere114e472008-02-04 22:29:50 -0800554 * @name: where to put the attribute name
555 * @value: where to put the attribute value
556 * @len: where to put the length of the attribute
557 *
558 * Returns 0 if it all works out, -ENOMEM if there's no memory
559 */
560static int smack_inode_init_security(struct inode *inode, struct inode *dir,
Eric Paris2a7dba32011-02-01 11:05:39 -0500561 const struct qstr *qstr, char **name,
562 void **value, size_t *len)
Casey Schauflere114e472008-02-04 22:29:50 -0800563{
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700564 struct smack_known *skp;
Casey Schaufler2267b132012-03-13 19:14:19 -0700565 struct inode_smack *issp = inode->i_security;
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700566 char *csp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -0800567 char *isp = smk_of_inode(inode);
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200568 char *dsp = smk_of_inode(dir);
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800569 int may;
Casey Schauflere114e472008-02-04 22:29:50 -0800570
571 if (name) {
Tetsuo Handaceffec552012-03-29 16:19:05 +0900572 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_NOFS);
Casey Schauflere114e472008-02-04 22:29:50 -0800573 if (*name == NULL)
574 return -ENOMEM;
575 }
576
577 if (value) {
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700578 skp = smk_find_entry(csp);
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800579 rcu_read_lock();
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700580 may = smk_access_entry(csp, dsp, &skp->smk_rules);
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800581 rcu_read_unlock();
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200582
583 /*
584 * If the access rule allows transmutation and
585 * the directory requests transmutation then
586 * by all means transmute.
Casey Schaufler2267b132012-03-13 19:14:19 -0700587 * Mark the inode as changed.
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200588 */
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800589 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
Casey Schaufler2267b132012-03-13 19:14:19 -0700590 smk_inode_transmutable(dir)) {
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200591 isp = dsp;
Casey Schaufler2267b132012-03-13 19:14:19 -0700592 issp->smk_flags |= SMK_INODE_CHANGED;
593 }
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200594
Tetsuo Handaceffec552012-03-29 16:19:05 +0900595 *value = kstrdup(isp, GFP_NOFS);
Casey Schauflere114e472008-02-04 22:29:50 -0800596 if (*value == NULL)
597 return -ENOMEM;
598 }
599
600 if (len)
601 *len = strlen(isp) + 1;
602
603 return 0;
604}
605
606/**
607 * smack_inode_link - Smack check on link
608 * @old_dentry: the existing object
609 * @dir: unused
610 * @new_dentry: the new object
611 *
612 * Returns 0 if access is permitted, an error code otherwise
613 */
614static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
615 struct dentry *new_dentry)
616{
Casey Schauflere114e472008-02-04 22:29:50 -0800617 char *isp;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200618 struct smk_audit_info ad;
619 int rc;
620
Eric Parisa2694342011-04-25 13:10:27 -0400621 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200622 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
Casey Schauflere114e472008-02-04 22:29:50 -0800623
624 isp = smk_of_inode(old_dentry->d_inode);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200625 rc = smk_curacc(isp, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800626
627 if (rc == 0 && new_dentry->d_inode != NULL) {
628 isp = smk_of_inode(new_dentry->d_inode);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200629 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
630 rc = smk_curacc(isp, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800631 }
632
633 return rc;
634}
635
636/**
637 * smack_inode_unlink - Smack check on inode deletion
638 * @dir: containing directory object
639 * @dentry: file to unlink
640 *
641 * Returns 0 if current can write the containing directory
642 * and the object, error code otherwise
643 */
644static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
645{
646 struct inode *ip = dentry->d_inode;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200647 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800648 int rc;
649
Eric Parisa2694342011-04-25 13:10:27 -0400650 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200651 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
652
Casey Schauflere114e472008-02-04 22:29:50 -0800653 /*
654 * You need write access to the thing you're unlinking
655 */
Etienne Bassetecfcc532009-04-08 20:40:06 +0200656 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
657 if (rc == 0) {
Casey Schauflere114e472008-02-04 22:29:50 -0800658 /*
659 * You also need write access to the containing directory
660 */
Etienne Bassetecfcc532009-04-08 20:40:06 +0200661 smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
662 smk_ad_setfield_u_fs_inode(&ad, dir);
663 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
664 }
Casey Schauflere114e472008-02-04 22:29:50 -0800665 return rc;
666}
667
668/**
669 * smack_inode_rmdir - Smack check on directory deletion
670 * @dir: containing directory object
671 * @dentry: directory to unlink
672 *
673 * Returns 0 if current can write the containing directory
674 * and the directory, error code otherwise
675 */
676static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
677{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200678 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800679 int rc;
680
Eric Parisa2694342011-04-25 13:10:27 -0400681 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200682 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
683
Casey Schauflere114e472008-02-04 22:29:50 -0800684 /*
685 * You need write access to the thing you're removing
686 */
Etienne Bassetecfcc532009-04-08 20:40:06 +0200687 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
688 if (rc == 0) {
Casey Schauflere114e472008-02-04 22:29:50 -0800689 /*
690 * You also need write access to the containing directory
691 */
Etienne Bassetecfcc532009-04-08 20:40:06 +0200692 smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
693 smk_ad_setfield_u_fs_inode(&ad, dir);
694 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
695 }
Casey Schauflere114e472008-02-04 22:29:50 -0800696
697 return rc;
698}
699
700/**
701 * smack_inode_rename - Smack check on rename
702 * @old_inode: the old directory
703 * @old_dentry: unused
704 * @new_inode: the new directory
705 * @new_dentry: unused
706 *
707 * Read and write access is required on both the old and
708 * new directories.
709 *
710 * Returns 0 if access is permitted, an error code otherwise
711 */
712static int smack_inode_rename(struct inode *old_inode,
713 struct dentry *old_dentry,
714 struct inode *new_inode,
715 struct dentry *new_dentry)
716{
717 int rc;
718 char *isp;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200719 struct smk_audit_info ad;
720
Eric Parisa2694342011-04-25 13:10:27 -0400721 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200722 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
Casey Schauflere114e472008-02-04 22:29:50 -0800723
724 isp = smk_of_inode(old_dentry->d_inode);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200725 rc = smk_curacc(isp, MAY_READWRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800726
727 if (rc == 0 && new_dentry->d_inode != NULL) {
728 isp = smk_of_inode(new_dentry->d_inode);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200729 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
730 rc = smk_curacc(isp, MAY_READWRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800731 }
Casey Schauflere114e472008-02-04 22:29:50 -0800732 return rc;
733}
734
735/**
736 * smack_inode_permission - Smack version of permission()
737 * @inode: the inode in question
738 * @mask: the access requested
Casey Schauflere114e472008-02-04 22:29:50 -0800739 *
740 * This is the important Smack hook.
741 *
742 * Returns 0 if access is permitted, -EACCES otherwise
743 */
Al Viroe74f71e2011-06-20 19:38:15 -0400744static int smack_inode_permission(struct inode *inode, int mask)
Casey Schauflere114e472008-02-04 22:29:50 -0800745{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200746 struct smk_audit_info ad;
Al Viroe74f71e2011-06-20 19:38:15 -0400747 int no_block = mask & MAY_NOT_BLOCK;
Eric Parisd09ca732010-07-23 11:43:57 -0400748
749 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
Casey Schauflere114e472008-02-04 22:29:50 -0800750 /*
751 * No permission to check. Existence test. Yup, it's there.
752 */
753 if (mask == 0)
754 return 0;
Andi Kleen8c9e80e2011-04-21 17:23:19 -0700755
756 /* May be droppable after audit */
Al Viroe74f71e2011-06-20 19:38:15 -0400757 if (no_block)
Andi Kleen8c9e80e2011-04-21 17:23:19 -0700758 return -ECHILD;
Eric Parisf48b7392011-04-25 12:54:27 -0400759 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200760 smk_ad_setfield_u_fs_inode(&ad, inode);
761 return smk_curacc(smk_of_inode(inode), mask, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800762}
763
764/**
765 * smack_inode_setattr - Smack check for setting attributes
766 * @dentry: the object
767 * @iattr: for the force flag
768 *
769 * Returns 0 if access is permitted, an error code otherwise
770 */
771static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
772{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200773 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800774 /*
775 * Need to allow for clearing the setuid bit.
776 */
777 if (iattr->ia_valid & ATTR_FORCE)
778 return 0;
Eric Parisa2694342011-04-25 13:10:27 -0400779 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200780 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
Casey Schauflere114e472008-02-04 22:29:50 -0800781
Etienne Bassetecfcc532009-04-08 20:40:06 +0200782 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800783}
784
785/**
786 * smack_inode_getattr - Smack check for getting attributes
787 * @mnt: unused
788 * @dentry: the object
789 *
790 * Returns 0 if access is permitted, an error code otherwise
791 */
792static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
793{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200794 struct smk_audit_info ad;
Eric Parisa2694342011-04-25 13:10:27 -0400795 struct path path;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200796
Eric Parisa2694342011-04-25 13:10:27 -0400797 path.dentry = dentry;
798 path.mnt = mnt;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200799
Eric Parisf48b7392011-04-25 12:54:27 -0400800 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
Eric Parisa2694342011-04-25 13:10:27 -0400801 smk_ad_setfield_u_fs_path(&ad, path);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200802 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800803}
804
805/**
806 * smack_inode_setxattr - Smack check for setting xattrs
807 * @dentry: the object
808 * @name: name of the attribute
809 * @value: unused
810 * @size: unused
811 * @flags: unused
812 *
813 * This protects the Smack attribute explicitly.
814 *
815 * Returns 0 if access is permitted, an error code otherwise
816 */
David Howells8f0cfa52008-04-29 00:59:41 -0700817static int smack_inode_setxattr(struct dentry *dentry, const char *name,
818 const void *value, size_t size, int flags)
Casey Schauflere114e472008-02-04 22:29:50 -0800819{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200820 struct smk_audit_info ad;
Casey Schauflerbcdca222008-02-23 15:24:04 -0800821 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -0800822
Casey Schauflerbcdca222008-02-23 15:24:04 -0800823 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
824 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
Casey Schaufler676dac42010-12-02 06:43:39 -0800825 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800826 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
827 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
Casey Schauflerbcdca222008-02-23 15:24:04 -0800828 if (!capable(CAP_MAC_ADMIN))
829 rc = -EPERM;
Etienne Bassetdefc4332009-04-16 23:58:42 +0200830 /*
831 * check label validity here so import wont fail on
832 * post_setxattr
833 */
Casey Schauflerf7112e62012-05-06 15:22:02 -0700834 if (size == 0 || size >= SMK_LONGLABEL ||
Etienne Bassetdefc4332009-04-16 23:58:42 +0200835 smk_import(value, size) == NULL)
Etienne Basset43031542009-03-27 17:11:01 -0400836 rc = -EINVAL;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200837 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
838 if (!capable(CAP_MAC_ADMIN))
839 rc = -EPERM;
840 if (size != TRANS_TRUE_SIZE ||
841 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
842 rc = -EINVAL;
Casey Schauflerbcdca222008-02-23 15:24:04 -0800843 } else
844 rc = cap_inode_setxattr(dentry, name, value, size, flags);
845
Eric Parisa2694342011-04-25 13:10:27 -0400846 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200847 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
848
Casey Schauflerbcdca222008-02-23 15:24:04 -0800849 if (rc == 0)
Etienne Bassetecfcc532009-04-08 20:40:06 +0200850 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
Casey Schauflerbcdca222008-02-23 15:24:04 -0800851
852 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -0800853}
854
855/**
856 * smack_inode_post_setxattr - Apply the Smack update approved above
857 * @dentry: object
858 * @name: attribute name
859 * @value: attribute value
860 * @size: attribute size
861 * @flags: unused
862 *
863 * Set the pointer in the inode blob to the entry found
864 * in the master label list.
865 */
David Howells8f0cfa52008-04-29 00:59:41 -0700866static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
867 const void *value, size_t size, int flags)
Casey Schauflere114e472008-02-04 22:29:50 -0800868{
Casey Schauflere114e472008-02-04 22:29:50 -0800869 char *nsp;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200870 struct inode_smack *isp = dentry->d_inode->i_security;
Casey Schaufler676dac42010-12-02 06:43:39 -0800871
872 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200873 nsp = smk_import(value, size);
Casey Schaufler676dac42010-12-02 06:43:39 -0800874 if (nsp != NULL)
875 isp->smk_inode = nsp;
876 else
877 isp->smk_inode = smack_known_invalid.smk_known;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200878 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
879 nsp = smk_import(value, size);
Casey Schaufler676dac42010-12-02 06:43:39 -0800880 if (nsp != NULL)
881 isp->smk_task = nsp;
882 else
883 isp->smk_task = smack_known_invalid.smk_known;
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800884 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
885 nsp = smk_import(value, size);
886 if (nsp != NULL)
887 isp->smk_mmap = nsp;
888 else
889 isp->smk_mmap = smack_known_invalid.smk_known;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200890 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
891 isp->smk_flags |= SMK_INODE_TRANSMUTE;
Casey Schauflere114e472008-02-04 22:29:50 -0800892
893 return;
894}
895
Casey Schauflerce8a4322011-09-29 18:21:01 -0700896/**
Casey Schauflere114e472008-02-04 22:29:50 -0800897 * smack_inode_getxattr - Smack check on getxattr
898 * @dentry: the object
899 * @name: unused
900 *
901 * Returns 0 if access is permitted, an error code otherwise
902 */
David Howells8f0cfa52008-04-29 00:59:41 -0700903static int smack_inode_getxattr(struct dentry *dentry, const char *name)
Casey Schauflere114e472008-02-04 22:29:50 -0800904{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200905 struct smk_audit_info ad;
906
Eric Parisa2694342011-04-25 13:10:27 -0400907 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200908 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
909
910 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800911}
912
Casey Schauflerce8a4322011-09-29 18:21:01 -0700913/**
Casey Schauflere114e472008-02-04 22:29:50 -0800914 * smack_inode_removexattr - Smack check on removexattr
915 * @dentry: the object
916 * @name: name of the attribute
917 *
918 * Removing the Smack attribute requires CAP_MAC_ADMIN
919 *
920 * Returns 0 if access is permitted, an error code otherwise
921 */
David Howells8f0cfa52008-04-29 00:59:41 -0700922static int smack_inode_removexattr(struct dentry *dentry, const char *name)
Casey Schauflere114e472008-02-04 22:29:50 -0800923{
Casey Schaufler676dac42010-12-02 06:43:39 -0800924 struct inode_smack *isp;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200925 struct smk_audit_info ad;
Casey Schauflerbcdca222008-02-23 15:24:04 -0800926 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -0800927
Casey Schauflerbcdca222008-02-23 15:24:04 -0800928 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
929 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
Casey Schaufler676dac42010-12-02 06:43:39 -0800930 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200931 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800932 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
933 strcmp(name, XATTR_NAME_SMACKMMAP)) {
Casey Schauflerbcdca222008-02-23 15:24:04 -0800934 if (!capable(CAP_MAC_ADMIN))
935 rc = -EPERM;
936 } else
937 rc = cap_inode_removexattr(dentry, name);
938
Eric Parisa2694342011-04-25 13:10:27 -0400939 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200940 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
Casey Schauflerbcdca222008-02-23 15:24:04 -0800941 if (rc == 0)
Etienne Bassetecfcc532009-04-08 20:40:06 +0200942 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
Casey Schauflerbcdca222008-02-23 15:24:04 -0800943
Casey Schaufler676dac42010-12-02 06:43:39 -0800944 if (rc == 0) {
945 isp = dentry->d_inode->i_security;
946 isp->smk_task = NULL;
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800947 isp->smk_mmap = NULL;
Casey Schaufler676dac42010-12-02 06:43:39 -0800948 }
949
Casey Schauflerbcdca222008-02-23 15:24:04 -0800950 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -0800951}
952
953/**
954 * smack_inode_getsecurity - get smack xattrs
955 * @inode: the object
956 * @name: attribute name
957 * @buffer: where to put the result
Randy Dunlap251a2a92009-02-18 11:42:33 -0800958 * @alloc: unused
Casey Schauflere114e472008-02-04 22:29:50 -0800959 *
960 * Returns the size of the attribute or an error code
961 */
962static int smack_inode_getsecurity(const struct inode *inode,
963 const char *name, void **buffer,
964 bool alloc)
965{
966 struct socket_smack *ssp;
967 struct socket *sock;
968 struct super_block *sbp;
969 struct inode *ip = (struct inode *)inode;
970 char *isp;
971 int ilen;
972 int rc = 0;
973
974 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
975 isp = smk_of_inode(inode);
976 ilen = strlen(isp) + 1;
977 *buffer = isp;
978 return ilen;
979 }
980
981 /*
982 * The rest of the Smack xattrs are only on sockets.
983 */
984 sbp = ip->i_sb;
985 if (sbp->s_magic != SOCKFS_MAGIC)
986 return -EOPNOTSUPP;
987
988 sock = SOCKET_I(ip);
Ahmed S. Darwish2e1d1462008-02-13 15:03:34 -0800989 if (sock == NULL || sock->sk == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -0800990 return -EOPNOTSUPP;
991
992 ssp = sock->sk->sk_security;
993
994 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
995 isp = ssp->smk_in;
996 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
997 isp = ssp->smk_out;
998 else
999 return -EOPNOTSUPP;
1000
1001 ilen = strlen(isp) + 1;
1002 if (rc == 0) {
1003 *buffer = isp;
1004 rc = ilen;
1005 }
1006
1007 return rc;
1008}
1009
1010
1011/**
1012 * smack_inode_listsecurity - list the Smack attributes
1013 * @inode: the object
1014 * @buffer: where they go
1015 * @buffer_size: size of buffer
1016 *
1017 * Returns 0 on success, -EINVAL otherwise
1018 */
1019static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1020 size_t buffer_size)
1021{
1022 int len = strlen(XATTR_NAME_SMACK);
1023
1024 if (buffer != NULL && len <= buffer_size) {
1025 memcpy(buffer, XATTR_NAME_SMACK, len);
1026 return len;
1027 }
1028 return -EINVAL;
1029}
1030
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10001031/**
1032 * smack_inode_getsecid - Extract inode's security id
1033 * @inode: inode to extract the info from
1034 * @secid: where result will be saved
1035 */
1036static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
1037{
1038 struct inode_smack *isp = inode->i_security;
1039
1040 *secid = smack_to_secid(isp->smk_inode);
1041}
1042
Casey Schauflere114e472008-02-04 22:29:50 -08001043/*
1044 * File Hooks
1045 */
1046
1047/**
1048 * smack_file_permission - Smack check on file operations
1049 * @file: unused
1050 * @mask: unused
1051 *
1052 * Returns 0
1053 *
1054 * Should access checks be done on each read or write?
1055 * UNICOS and SELinux say yes.
1056 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1057 *
1058 * I'll say no for now. Smack does not do the frequent
1059 * label changing that SELinux does.
1060 */
1061static int smack_file_permission(struct file *file, int mask)
1062{
1063 return 0;
1064}
1065
1066/**
1067 * smack_file_alloc_security - assign a file security blob
1068 * @file: the object
1069 *
1070 * The security blob for a file is a pointer to the master
1071 * label list, so no allocation is done.
1072 *
1073 * Returns 0
1074 */
1075static int smack_file_alloc_security(struct file *file)
1076{
Casey Schaufler676dac42010-12-02 06:43:39 -08001077 file->f_security = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08001078 return 0;
1079}
1080
1081/**
1082 * smack_file_free_security - clear a file security blob
1083 * @file: the object
1084 *
1085 * The security blob for a file is a pointer to the master
1086 * label list, so no memory is freed.
1087 */
1088static void smack_file_free_security(struct file *file)
1089{
1090 file->f_security = NULL;
1091}
1092
1093/**
1094 * smack_file_ioctl - Smack check on ioctls
1095 * @file: the object
1096 * @cmd: what to do
1097 * @arg: unused
1098 *
1099 * Relies heavily on the correct use of the ioctl command conventions.
1100 *
1101 * Returns 0 if allowed, error code otherwise
1102 */
1103static int smack_file_ioctl(struct file *file, unsigned int cmd,
1104 unsigned long arg)
1105{
1106 int rc = 0;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001107 struct smk_audit_info ad;
1108
Eric Parisf48b7392011-04-25 12:54:27 -04001109 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001110 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Casey Schauflere114e472008-02-04 22:29:50 -08001111
1112 if (_IOC_DIR(cmd) & _IOC_WRITE)
Etienne Bassetecfcc532009-04-08 20:40:06 +02001113 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001114
1115 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
Etienne Bassetecfcc532009-04-08 20:40:06 +02001116 rc = smk_curacc(file->f_security, MAY_READ, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001117
1118 return rc;
1119}
1120
1121/**
1122 * smack_file_lock - Smack check on file locking
1123 * @file: the object
Randy Dunlap251a2a92009-02-18 11:42:33 -08001124 * @cmd: unused
Casey Schauflere114e472008-02-04 22:29:50 -08001125 *
1126 * Returns 0 if current has write access, error code otherwise
1127 */
1128static int smack_file_lock(struct file *file, unsigned int cmd)
1129{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001130 struct smk_audit_info ad;
1131
Eric Paris92f42502011-04-25 13:15:55 -04001132 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1133 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001134 return smk_curacc(file->f_security, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001135}
1136
1137/**
1138 * smack_file_fcntl - Smack check on fcntl
1139 * @file: the object
1140 * @cmd: what action to check
1141 * @arg: unused
1142 *
Casey Schaufler531f1d42011-09-19 12:41:42 -07001143 * Generally these operations are harmless.
1144 * File locking operations present an obvious mechanism
1145 * for passing information, so they require write access.
1146 *
Casey Schauflere114e472008-02-04 22:29:50 -08001147 * Returns 0 if current has access, error code otherwise
1148 */
1149static int smack_file_fcntl(struct file *file, unsigned int cmd,
1150 unsigned long arg)
1151{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001152 struct smk_audit_info ad;
Casey Schaufler531f1d42011-09-19 12:41:42 -07001153 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08001154
Etienne Bassetecfcc532009-04-08 20:40:06 +02001155
Casey Schauflere114e472008-02-04 22:29:50 -08001156 switch (cmd) {
Casey Schauflere114e472008-02-04 22:29:50 -08001157 case F_GETLK:
Casey Schauflere114e472008-02-04 22:29:50 -08001158 case F_SETLK:
1159 case F_SETLKW:
1160 case F_SETOWN:
1161 case F_SETSIG:
Casey Schaufler531f1d42011-09-19 12:41:42 -07001162 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1163 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001164 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001165 break;
1166 default:
Casey Schaufler531f1d42011-09-19 12:41:42 -07001167 break;
Casey Schauflere114e472008-02-04 22:29:50 -08001168 }
1169
1170 return rc;
1171}
1172
1173/**
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001174 * smack_file_mmap :
1175 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1176 * if mapping anonymous memory.
1177 * @file contains the file structure for file to map (may be NULL).
1178 * @reqprot contains the protection requested by the application.
1179 * @prot contains the protection that will be applied by the kernel.
1180 * @flags contains the operational flags.
1181 * Return 0 if permission is granted.
1182 */
1183static int smack_file_mmap(struct file *file,
1184 unsigned long reqprot, unsigned long prot,
1185 unsigned long flags, unsigned long addr,
1186 unsigned long addr_only)
1187{
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001188 struct smack_known *skp;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001189 struct smack_rule *srp;
1190 struct task_smack *tsp;
1191 char *sp;
1192 char *msmack;
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001193 char *osmack;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001194 struct inode_smack *isp;
1195 struct dentry *dp;
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001196 int may;
1197 int mmay;
1198 int tmay;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001199 int rc;
1200
1201 /* do DAC check on address space usage */
1202 rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
1203 if (rc || addr_only)
1204 return rc;
1205
1206 if (file == NULL || file->f_dentry == NULL)
1207 return 0;
1208
1209 dp = file->f_dentry;
1210
1211 if (dp->d_inode == NULL)
1212 return 0;
1213
1214 isp = dp->d_inode->i_security;
1215 if (isp->smk_mmap == NULL)
1216 return 0;
1217 msmack = isp->smk_mmap;
1218
1219 tsp = current_security();
1220 sp = smk_of_current();
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001221 skp = smk_find_entry(sp);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001222 rc = 0;
1223
1224 rcu_read_lock();
1225 /*
1226 * For each Smack rule associated with the subject
1227 * label verify that the SMACK64MMAP also has access
1228 * to that rule's object label.
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001229 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001230 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001231 osmack = srp->smk_object;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001232 /*
1233 * Matching labels always allows access.
1234 */
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001235 if (msmack == osmack)
1236 continue;
1237 /*
1238 * If there is a matching local rule take
1239 * that into account as well.
1240 */
1241 may = smk_access_entry(srp->smk_subject, osmack,
1242 &tsp->smk_rules);
1243 if (may == -ENOENT)
1244 may = srp->smk_access;
1245 else
1246 may &= srp->smk_access;
1247 /*
1248 * If may is zero the SMACK64MMAP subject can't
1249 * possibly have less access.
1250 */
1251 if (may == 0)
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001252 continue;
1253
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001254 /*
1255 * Fetch the global list entry.
1256 * If there isn't one a SMACK64MMAP subject
1257 * can't have as much access as current.
1258 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001259 skp = smk_find_entry(msmack);
1260 mmay = smk_access_entry(msmack, osmack, &skp->smk_rules);
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001261 if (mmay == -ENOENT) {
1262 rc = -EACCES;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001263 break;
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001264 }
1265 /*
1266 * If there is a local entry it modifies the
1267 * potential access, too.
1268 */
1269 tmay = smk_access_entry(msmack, osmack, &tsp->smk_rules);
1270 if (tmay != -ENOENT)
1271 mmay &= tmay;
1272
1273 /*
1274 * If there is any access available to current that is
1275 * not available to a SMACK64MMAP subject
1276 * deny access.
1277 */
Casey Schaufler75a25632011-02-09 19:58:42 -08001278 if ((may | mmay) != mmay) {
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001279 rc = -EACCES;
1280 break;
1281 }
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001282 }
1283
1284 rcu_read_unlock();
1285
1286 return rc;
1287}
1288
1289/**
Casey Schauflere114e472008-02-04 22:29:50 -08001290 * smack_file_set_fowner - set the file security blob value
1291 * @file: object in question
1292 *
1293 * Returns 0
1294 * Further research may be required on this one.
1295 */
1296static int smack_file_set_fowner(struct file *file)
1297{
Casey Schaufler676dac42010-12-02 06:43:39 -08001298 file->f_security = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08001299 return 0;
1300}
1301
1302/**
1303 * smack_file_send_sigiotask - Smack on sigio
1304 * @tsk: The target task
1305 * @fown: the object the signal come from
1306 * @signum: unused
1307 *
1308 * Allow a privileged task to get signals even if it shouldn't
1309 *
1310 * Returns 0 if a subject with the object's smack could
1311 * write to the task, an error code otherwise.
1312 */
1313static int smack_file_send_sigiotask(struct task_struct *tsk,
1314 struct fown_struct *fown, int signum)
1315{
1316 struct file *file;
1317 int rc;
Casey Schaufler676dac42010-12-02 06:43:39 -08001318 char *tsp = smk_of_task(tsk->cred->security);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001319 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -08001320
1321 /*
1322 * struct fown_struct is never outside the context of a struct file
1323 */
1324 file = container_of(fown, struct file, f_owner);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001325
Etienne Bassetecfcc532009-04-08 20:40:06 +02001326 /* we don't log here as rc can be overriden */
1327 rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL);
David Howells5cd9c582008-08-14 11:37:28 +01001328 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
Etienne Bassetecfcc532009-04-08 20:40:06 +02001329 rc = 0;
1330
1331 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1332 smk_ad_setfield_u_tsk(&ad, tsk);
1333 smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001334 return rc;
1335}
1336
1337/**
1338 * smack_file_receive - Smack file receive check
1339 * @file: the object
1340 *
1341 * Returns 0 if current has access, error code otherwise
1342 */
1343static int smack_file_receive(struct file *file)
1344{
1345 int may = 0;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001346 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -08001347
Etienne Bassetecfcc532009-04-08 20:40:06 +02001348 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1349 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Casey Schauflere114e472008-02-04 22:29:50 -08001350 /*
1351 * This code relies on bitmasks.
1352 */
1353 if (file->f_mode & FMODE_READ)
1354 may = MAY_READ;
1355 if (file->f_mode & FMODE_WRITE)
1356 may |= MAY_WRITE;
1357
Etienne Bassetecfcc532009-04-08 20:40:06 +02001358 return smk_curacc(file->f_security, may, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001359}
1360
Casey Schaufler531f1d42011-09-19 12:41:42 -07001361/**
1362 * smack_dentry_open - Smack dentry open processing
1363 * @file: the object
1364 * @cred: unused
1365 *
1366 * Set the security blob in the file structure.
1367 *
1368 * Returns 0
1369 */
1370static int smack_dentry_open(struct file *file, const struct cred *cred)
1371{
1372 struct inode_smack *isp = file->f_path.dentry->d_inode->i_security;
1373
1374 file->f_security = isp->smk_inode;
1375
1376 return 0;
1377}
1378
Casey Schauflere114e472008-02-04 22:29:50 -08001379/*
1380 * Task hooks
1381 */
1382
1383/**
David Howellsee18d642009-09-02 09:14:21 +01001384 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1385 * @new: the new credentials
1386 * @gfp: the atomicity of any memory allocations
1387 *
1388 * Prepare a blank set of credentials for modification. This must allocate all
1389 * the memory the LSM module might require such that cred_transfer() can
1390 * complete without error.
1391 */
1392static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1393{
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001394 struct task_smack *tsp;
1395
1396 tsp = new_task_smack(NULL, NULL, gfp);
1397 if (tsp == NULL)
Casey Schaufler676dac42010-12-02 06:43:39 -08001398 return -ENOMEM;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001399
1400 cred->security = tsp;
1401
David Howellsee18d642009-09-02 09:14:21 +01001402 return 0;
1403}
1404
1405
1406/**
David Howellsf1752ee2008-11-14 10:39:17 +11001407 * smack_cred_free - "free" task-level security credentials
1408 * @cred: the credentials in question
Casey Schauflere114e472008-02-04 22:29:50 -08001409 *
Casey Schauflere114e472008-02-04 22:29:50 -08001410 */
David Howellsf1752ee2008-11-14 10:39:17 +11001411static void smack_cred_free(struct cred *cred)
Casey Schauflere114e472008-02-04 22:29:50 -08001412{
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001413 struct task_smack *tsp = cred->security;
1414 struct smack_rule *rp;
1415 struct list_head *l;
1416 struct list_head *n;
1417
1418 if (tsp == NULL)
1419 return;
1420 cred->security = NULL;
1421
1422 list_for_each_safe(l, n, &tsp->smk_rules) {
1423 rp = list_entry(l, struct smack_rule, list);
1424 list_del(&rp->list);
1425 kfree(rp);
1426 }
1427 kfree(tsp);
Casey Schauflere114e472008-02-04 22:29:50 -08001428}
1429
1430/**
David Howellsd84f4f92008-11-14 10:39:23 +11001431 * smack_cred_prepare - prepare new set of credentials for modification
1432 * @new: the new credentials
1433 * @old: the original credentials
1434 * @gfp: the atomicity of any memory allocations
1435 *
1436 * Prepare a new set of credentials for modification.
1437 */
1438static int smack_cred_prepare(struct cred *new, const struct cred *old,
1439 gfp_t gfp)
1440{
Casey Schaufler676dac42010-12-02 06:43:39 -08001441 struct task_smack *old_tsp = old->security;
1442 struct task_smack *new_tsp;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001443 int rc;
Casey Schaufler676dac42010-12-02 06:43:39 -08001444
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001445 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
Casey Schaufler676dac42010-12-02 06:43:39 -08001446 if (new_tsp == NULL)
1447 return -ENOMEM;
1448
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001449 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1450 if (rc != 0)
1451 return rc;
1452
Casey Schaufler676dac42010-12-02 06:43:39 -08001453 new->security = new_tsp;
David Howellsd84f4f92008-11-14 10:39:23 +11001454 return 0;
1455}
1456
Randy Dunlap251a2a92009-02-18 11:42:33 -08001457/**
David Howellsee18d642009-09-02 09:14:21 +01001458 * smack_cred_transfer - Transfer the old credentials to the new credentials
1459 * @new: the new credentials
1460 * @old: the original credentials
1461 *
1462 * Fill in a set of blank credentials from another set of credentials.
1463 */
1464static void smack_cred_transfer(struct cred *new, const struct cred *old)
1465{
Casey Schaufler676dac42010-12-02 06:43:39 -08001466 struct task_smack *old_tsp = old->security;
1467 struct task_smack *new_tsp = new->security;
1468
1469 new_tsp->smk_task = old_tsp->smk_task;
1470 new_tsp->smk_forked = old_tsp->smk_task;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001471 mutex_init(&new_tsp->smk_rules_lock);
1472 INIT_LIST_HEAD(&new_tsp->smk_rules);
1473
1474
1475 /* cbs copy rule list */
David Howellsee18d642009-09-02 09:14:21 +01001476}
1477
1478/**
David Howells3a3b7ce2008-11-14 10:39:28 +11001479 * smack_kernel_act_as - Set the subjective context in a set of credentials
Randy Dunlap251a2a92009-02-18 11:42:33 -08001480 * @new: points to the set of credentials to be modified.
1481 * @secid: specifies the security ID to be set
David Howells3a3b7ce2008-11-14 10:39:28 +11001482 *
1483 * Set the security data for a kernel service.
1484 */
1485static int smack_kernel_act_as(struct cred *new, u32 secid)
1486{
Casey Schaufler676dac42010-12-02 06:43:39 -08001487 struct task_smack *new_tsp = new->security;
David Howells3a3b7ce2008-11-14 10:39:28 +11001488 char *smack = smack_from_secid(secid);
1489
1490 if (smack == NULL)
1491 return -EINVAL;
1492
Casey Schaufler676dac42010-12-02 06:43:39 -08001493 new_tsp->smk_task = smack;
David Howells3a3b7ce2008-11-14 10:39:28 +11001494 return 0;
1495}
1496
1497/**
1498 * smack_kernel_create_files_as - Set the file creation label in a set of creds
Randy Dunlap251a2a92009-02-18 11:42:33 -08001499 * @new: points to the set of credentials to be modified
1500 * @inode: points to the inode to use as a reference
David Howells3a3b7ce2008-11-14 10:39:28 +11001501 *
1502 * Set the file creation context in a set of credentials to the same
1503 * as the objective context of the specified inode
1504 */
1505static int smack_kernel_create_files_as(struct cred *new,
1506 struct inode *inode)
1507{
1508 struct inode_smack *isp = inode->i_security;
Casey Schaufler676dac42010-12-02 06:43:39 -08001509 struct task_smack *tsp = new->security;
David Howells3a3b7ce2008-11-14 10:39:28 +11001510
Casey Schaufler676dac42010-12-02 06:43:39 -08001511 tsp->smk_forked = isp->smk_inode;
1512 tsp->smk_task = isp->smk_inode;
David Howells3a3b7ce2008-11-14 10:39:28 +11001513 return 0;
1514}
1515
1516/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02001517 * smk_curacc_on_task - helper to log task related access
1518 * @p: the task object
Casey Schaufler531f1d42011-09-19 12:41:42 -07001519 * @access: the access requested
1520 * @caller: name of the calling function for audit
Etienne Bassetecfcc532009-04-08 20:40:06 +02001521 *
1522 * Return 0 if access is permitted
1523 */
Casey Schaufler531f1d42011-09-19 12:41:42 -07001524static int smk_curacc_on_task(struct task_struct *p, int access,
1525 const char *caller)
Etienne Bassetecfcc532009-04-08 20:40:06 +02001526{
1527 struct smk_audit_info ad;
1528
Casey Schaufler531f1d42011-09-19 12:41:42 -07001529 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001530 smk_ad_setfield_u_tsk(&ad, p);
Casey Schaufler676dac42010-12-02 06:43:39 -08001531 return smk_curacc(smk_of_task(task_security(p)), access, &ad);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001532}
1533
1534/**
Casey Schauflere114e472008-02-04 22:29:50 -08001535 * smack_task_setpgid - Smack check on setting pgid
1536 * @p: the task object
1537 * @pgid: unused
1538 *
1539 * Return 0 if write access is permitted
1540 */
1541static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1542{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001543 return smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001544}
1545
1546/**
1547 * smack_task_getpgid - Smack access check for getpgid
1548 * @p: the object task
1549 *
1550 * Returns 0 if current can read the object task, error code otherwise
1551 */
1552static int smack_task_getpgid(struct task_struct *p)
1553{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001554 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001555}
1556
1557/**
1558 * smack_task_getsid - Smack access check for getsid
1559 * @p: the object task
1560 *
1561 * Returns 0 if current can read the object task, error code otherwise
1562 */
1563static int smack_task_getsid(struct task_struct *p)
1564{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001565 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001566}
1567
1568/**
1569 * smack_task_getsecid - get the secid of the task
1570 * @p: the object task
1571 * @secid: where to put the result
1572 *
1573 * Sets the secid to contain a u32 version of the smack label.
1574 */
1575static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1576{
Casey Schaufler676dac42010-12-02 06:43:39 -08001577 *secid = smack_to_secid(smk_of_task(task_security(p)));
Casey Schauflere114e472008-02-04 22:29:50 -08001578}
1579
1580/**
1581 * smack_task_setnice - Smack check on setting nice
1582 * @p: the task object
1583 * @nice: unused
1584 *
1585 * Return 0 if write access is permitted
1586 */
1587static int smack_task_setnice(struct task_struct *p, int nice)
1588{
Casey Schauflerbcdca222008-02-23 15:24:04 -08001589 int rc;
1590
1591 rc = cap_task_setnice(p, nice);
1592 if (rc == 0)
Casey Schaufler531f1d42011-09-19 12:41:42 -07001593 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflerbcdca222008-02-23 15:24:04 -08001594 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001595}
1596
1597/**
1598 * smack_task_setioprio - Smack check on setting ioprio
1599 * @p: the task object
1600 * @ioprio: unused
1601 *
1602 * Return 0 if write access is permitted
1603 */
1604static int smack_task_setioprio(struct task_struct *p, int ioprio)
1605{
Casey Schauflerbcdca222008-02-23 15:24:04 -08001606 int rc;
1607
1608 rc = cap_task_setioprio(p, ioprio);
1609 if (rc == 0)
Casey Schaufler531f1d42011-09-19 12:41:42 -07001610 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflerbcdca222008-02-23 15:24:04 -08001611 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001612}
1613
1614/**
1615 * smack_task_getioprio - Smack check on reading ioprio
1616 * @p: the task object
1617 *
1618 * Return 0 if read access is permitted
1619 */
1620static int smack_task_getioprio(struct task_struct *p)
1621{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001622 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001623}
1624
1625/**
1626 * smack_task_setscheduler - Smack check on setting scheduler
1627 * @p: the task object
1628 * @policy: unused
1629 * @lp: unused
1630 *
1631 * Return 0 if read access is permitted
1632 */
KOSAKI Motohirob0ae1982010-10-15 04:21:18 +09001633static int smack_task_setscheduler(struct task_struct *p)
Casey Schauflere114e472008-02-04 22:29:50 -08001634{
Casey Schauflerbcdca222008-02-23 15:24:04 -08001635 int rc;
1636
KOSAKI Motohirob0ae1982010-10-15 04:21:18 +09001637 rc = cap_task_setscheduler(p);
Casey Schauflerbcdca222008-02-23 15:24:04 -08001638 if (rc == 0)
Casey Schaufler531f1d42011-09-19 12:41:42 -07001639 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflerbcdca222008-02-23 15:24:04 -08001640 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001641}
1642
1643/**
1644 * smack_task_getscheduler - Smack check on reading scheduler
1645 * @p: the task object
1646 *
1647 * Return 0 if read access is permitted
1648 */
1649static int smack_task_getscheduler(struct task_struct *p)
1650{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001651 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001652}
1653
1654/**
1655 * smack_task_movememory - Smack check on moving memory
1656 * @p: the task object
1657 *
1658 * Return 0 if write access is permitted
1659 */
1660static int smack_task_movememory(struct task_struct *p)
1661{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001662 return smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001663}
1664
1665/**
1666 * smack_task_kill - Smack check on signal delivery
1667 * @p: the task object
1668 * @info: unused
1669 * @sig: unused
1670 * @secid: identifies the smack to use in lieu of current's
1671 *
1672 * Return 0 if write access is permitted
1673 *
1674 * The secid behavior is an artifact of an SELinux hack
1675 * in the USB code. Someday it may go away.
1676 */
1677static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1678 int sig, u32 secid)
1679{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001680 struct smk_audit_info ad;
1681
1682 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1683 smk_ad_setfield_u_tsk(&ad, p);
Casey Schauflere114e472008-02-04 22:29:50 -08001684 /*
Casey Schauflere114e472008-02-04 22:29:50 -08001685 * Sending a signal requires that the sender
1686 * can write the receiver.
1687 */
1688 if (secid == 0)
Casey Schaufler676dac42010-12-02 06:43:39 -08001689 return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE,
1690 &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001691 /*
1692 * If the secid isn't 0 we're dealing with some USB IO
1693 * specific behavior. This is not clean. For one thing
1694 * we can't take privilege into account.
1695 */
Casey Schaufler676dac42010-12-02 06:43:39 -08001696 return smk_access(smack_from_secid(secid),
1697 smk_of_task(task_security(p)), MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001698}
1699
1700/**
1701 * smack_task_wait - Smack access check for waiting
1702 * @p: task to wait for
1703 *
1704 * Returns 0 if current can wait for p, error code otherwise
1705 */
1706static int smack_task_wait(struct task_struct *p)
1707{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001708 struct smk_audit_info ad;
Casey Schaufler676dac42010-12-02 06:43:39 -08001709 char *sp = smk_of_current();
1710 char *tsp = smk_of_forked(task_security(p));
Casey Schauflere114e472008-02-04 22:29:50 -08001711 int rc;
1712
Etienne Bassetecfcc532009-04-08 20:40:06 +02001713 /* we don't log here, we can be overriden */
Casey Schaufler676dac42010-12-02 06:43:39 -08001714 rc = smk_access(tsp, sp, MAY_WRITE, NULL);
Casey Schauflere114e472008-02-04 22:29:50 -08001715 if (rc == 0)
Etienne Bassetecfcc532009-04-08 20:40:06 +02001716 goto out_log;
Casey Schauflere114e472008-02-04 22:29:50 -08001717
1718 /*
1719 * Allow the operation to succeed if either task
1720 * has privilege to perform operations that might
1721 * account for the smack labels having gotten to
1722 * be different in the first place.
1723 *
David Howells5cd9c582008-08-14 11:37:28 +01001724 * This breaks the strict subject/object access
Casey Schauflere114e472008-02-04 22:29:50 -08001725 * control ideal, taking the object's privilege
1726 * state into account in the decision as well as
1727 * the smack value.
1728 */
David Howells5cd9c582008-08-14 11:37:28 +01001729 if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE))
Etienne Bassetecfcc532009-04-08 20:40:06 +02001730 rc = 0;
1731 /* we log only if we didn't get overriden */
1732 out_log:
1733 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1734 smk_ad_setfield_u_tsk(&ad, p);
Casey Schaufler676dac42010-12-02 06:43:39 -08001735 smack_log(tsp, sp, MAY_WRITE, rc, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001736 return rc;
1737}
1738
1739/**
1740 * smack_task_to_inode - copy task smack into the inode blob
1741 * @p: task to copy from
Randy Dunlap251a2a92009-02-18 11:42:33 -08001742 * @inode: inode to copy to
Casey Schauflere114e472008-02-04 22:29:50 -08001743 *
1744 * Sets the smack pointer in the inode security blob
1745 */
1746static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1747{
1748 struct inode_smack *isp = inode->i_security;
Casey Schaufler676dac42010-12-02 06:43:39 -08001749 isp->smk_inode = smk_of_task(task_security(p));
Casey Schauflere114e472008-02-04 22:29:50 -08001750}
1751
1752/*
1753 * Socket hooks.
1754 */
1755
1756/**
1757 * smack_sk_alloc_security - Allocate a socket blob
1758 * @sk: the socket
1759 * @family: unused
Randy Dunlap251a2a92009-02-18 11:42:33 -08001760 * @gfp_flags: memory allocation flags
Casey Schauflere114e472008-02-04 22:29:50 -08001761 *
1762 * Assign Smack pointers to current
1763 *
1764 * Returns 0 on success, -ENOMEM is there's no memory
1765 */
1766static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1767{
Casey Schaufler676dac42010-12-02 06:43:39 -08001768 char *csp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08001769 struct socket_smack *ssp;
1770
1771 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1772 if (ssp == NULL)
1773 return -ENOMEM;
1774
1775 ssp->smk_in = csp;
1776 ssp->smk_out = csp;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001777 ssp->smk_packet = NULL;
Casey Schauflere114e472008-02-04 22:29:50 -08001778
1779 sk->sk_security = ssp;
1780
1781 return 0;
1782}
1783
1784/**
1785 * smack_sk_free_security - Free a socket blob
1786 * @sk: the socket
1787 *
1788 * Clears the blob pointer
1789 */
1790static void smack_sk_free_security(struct sock *sk)
1791{
1792 kfree(sk->sk_security);
1793}
1794
1795/**
Paul Moore07feee82009-03-27 17:10:54 -04001796* smack_host_label - check host based restrictions
1797* @sip: the object end
1798*
1799* looks for host based access restrictions
1800*
1801* This version will only be appropriate for really small sets of single label
1802* hosts. The caller is responsible for ensuring that the RCU read lock is
1803* taken before calling this function.
1804*
1805* Returns the label of the far end or NULL if it's not special.
1806*/
1807static char *smack_host_label(struct sockaddr_in *sip)
1808{
1809 struct smk_netlbladdr *snp;
1810 struct in_addr *siap = &sip->sin_addr;
1811
1812 if (siap->s_addr == 0)
1813 return NULL;
1814
1815 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1816 /*
1817 * we break after finding the first match because
1818 * the list is sorted from longest to shortest mask
1819 * so we have found the most specific match
1820 */
1821 if ((&snp->smk_host.sin_addr)->s_addr ==
Etienne Basset43031542009-03-27 17:11:01 -04001822 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1823 /* we have found the special CIPSO option */
1824 if (snp->smk_label == smack_cipso_option)
1825 return NULL;
Paul Moore07feee82009-03-27 17:10:54 -04001826 return snp->smk_label;
Etienne Basset43031542009-03-27 17:11:01 -04001827 }
Paul Moore07feee82009-03-27 17:10:54 -04001828
1829 return NULL;
1830}
1831
1832/**
Casey Schauflere114e472008-02-04 22:29:50 -08001833 * smack_netlabel - Set the secattr on a socket
1834 * @sk: the socket
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001835 * @labeled: socket label scheme
Casey Schauflere114e472008-02-04 22:29:50 -08001836 *
1837 * Convert the outbound smack value (smk_out) to a
1838 * secattr and attach it to the socket.
1839 *
1840 * Returns 0 on success or an error code
1841 */
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001842static int smack_netlabel(struct sock *sk, int labeled)
Casey Schauflere114e472008-02-04 22:29:50 -08001843{
Casey Schauflerf7112e62012-05-06 15:22:02 -07001844 struct smack_known *skp;
Paul Moore07feee82009-03-27 17:10:54 -04001845 struct socket_smack *ssp = sk->sk_security;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001846 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08001847
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001848 /*
1849 * Usually the netlabel code will handle changing the
1850 * packet labeling based on the label.
1851 * The case of a single label host is different, because
1852 * a single label host should never get a labeled packet
1853 * even though the label is usually associated with a packet
1854 * label.
1855 */
1856 local_bh_disable();
1857 bh_lock_sock_nested(sk);
1858
1859 if (ssp->smk_out == smack_net_ambient ||
1860 labeled == SMACK_UNLABELED_SOCKET)
1861 netlbl_sock_delattr(sk);
1862 else {
Casey Schauflerf7112e62012-05-06 15:22:02 -07001863 skp = smk_find_entry(ssp->smk_out);
1864 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001865 }
1866
1867 bh_unlock_sock(sk);
1868 local_bh_enable();
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001869
Casey Schauflere114e472008-02-04 22:29:50 -08001870 return rc;
1871}
1872
1873/**
Paul Moore07feee82009-03-27 17:10:54 -04001874 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1875 * @sk: the socket
1876 * @sap: the destination address
1877 *
1878 * Set the correct secattr for the given socket based on the destination
1879 * address and perform any outbound access checks needed.
1880 *
1881 * Returns 0 on success or an error code.
1882 *
1883 */
1884static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1885{
1886 int rc;
1887 int sk_lbl;
1888 char *hostsp;
1889 struct socket_smack *ssp = sk->sk_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001890 struct smk_audit_info ad;
Paul Moore07feee82009-03-27 17:10:54 -04001891
1892 rcu_read_lock();
1893 hostsp = smack_host_label(sap);
1894 if (hostsp != NULL) {
Etienne Bassetecfcc532009-04-08 20:40:06 +02001895#ifdef CONFIG_AUDIT
Kees Cook923e9a12012-04-10 13:26:44 -07001896 struct lsm_network_audit net;
1897
Eric Paris48c62af2012-04-02 13:15:44 -04001898 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
1899 ad.a.u.net->family = sap->sin_family;
1900 ad.a.u.net->dport = sap->sin_port;
1901 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001902#endif
Kees Cook923e9a12012-04-10 13:26:44 -07001903 sk_lbl = SMACK_UNLABELED_SOCKET;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001904 rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad);
Paul Moore07feee82009-03-27 17:10:54 -04001905 } else {
1906 sk_lbl = SMACK_CIPSO_SOCKET;
1907 rc = 0;
1908 }
1909 rcu_read_unlock();
1910 if (rc != 0)
1911 return rc;
1912
1913 return smack_netlabel(sk, sk_lbl);
1914}
1915
1916/**
Casey Schauflere114e472008-02-04 22:29:50 -08001917 * smack_inode_setsecurity - set smack xattrs
1918 * @inode: the object
1919 * @name: attribute name
1920 * @value: attribute value
1921 * @size: size of the attribute
1922 * @flags: unused
1923 *
1924 * Sets the named attribute in the appropriate blob
1925 *
1926 * Returns 0 on success, or an error code
1927 */
1928static int smack_inode_setsecurity(struct inode *inode, const char *name,
1929 const void *value, size_t size, int flags)
1930{
1931 char *sp;
1932 struct inode_smack *nsp = inode->i_security;
1933 struct socket_smack *ssp;
1934 struct socket *sock;
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001935 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08001936
Casey Schauflerf7112e62012-05-06 15:22:02 -07001937 if (value == NULL || size > SMK_LONGLABEL || size == 0)
Casey Schauflere114e472008-02-04 22:29:50 -08001938 return -EACCES;
1939
1940 sp = smk_import(value, size);
1941 if (sp == NULL)
1942 return -EINVAL;
1943
1944 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1945 nsp->smk_inode = sp;
David P. Quigleyddd29ec2009-09-09 14:25:37 -04001946 nsp->smk_flags |= SMK_INODE_INSTANT;
Casey Schauflere114e472008-02-04 22:29:50 -08001947 return 0;
1948 }
1949 /*
1950 * The rest of the Smack xattrs are only on sockets.
1951 */
1952 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
1953 return -EOPNOTSUPP;
1954
1955 sock = SOCKET_I(inode);
Ahmed S. Darwish2e1d1462008-02-13 15:03:34 -08001956 if (sock == NULL || sock->sk == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08001957 return -EOPNOTSUPP;
1958
1959 ssp = sock->sk->sk_security;
1960
1961 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1962 ssp->smk_in = sp;
1963 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
1964 ssp->smk_out = sp;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08001965 if (sock->sk->sk_family != PF_UNIX) {
1966 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1967 if (rc != 0)
1968 printk(KERN_WARNING
1969 "Smack: \"%s\" netlbl error %d.\n",
1970 __func__, -rc);
1971 }
Casey Schauflere114e472008-02-04 22:29:50 -08001972 } else
1973 return -EOPNOTSUPP;
1974
1975 return 0;
1976}
1977
1978/**
1979 * smack_socket_post_create - finish socket setup
1980 * @sock: the socket
1981 * @family: protocol family
1982 * @type: unused
1983 * @protocol: unused
1984 * @kern: unused
1985 *
1986 * Sets the netlabel information on the socket
1987 *
1988 * Returns 0 on success, and error code otherwise
1989 */
1990static int smack_socket_post_create(struct socket *sock, int family,
1991 int type, int protocol, int kern)
1992{
Ahmed S. Darwish2e1d1462008-02-13 15:03:34 -08001993 if (family != PF_INET || sock->sk == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08001994 return 0;
1995 /*
1996 * Set the outbound netlbl.
1997 */
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001998 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1999}
2000
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002001/**
2002 * smack_socket_connect - connect access check
2003 * @sock: the socket
2004 * @sap: the other end
2005 * @addrlen: size of sap
2006 *
2007 * Verifies that a connection may be possible
2008 *
2009 * Returns 0 on success, and error code otherwise
2010 */
2011static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2012 int addrlen)
2013{
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002014 if (sock->sk == NULL || sock->sk->sk_family != PF_INET)
2015 return 0;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002016 if (addrlen < sizeof(struct sockaddr_in))
2017 return -EINVAL;
2018
Paul Moore07feee82009-03-27 17:10:54 -04002019 return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
Casey Schauflere114e472008-02-04 22:29:50 -08002020}
2021
2022/**
2023 * smack_flags_to_may - convert S_ to MAY_ values
2024 * @flags: the S_ value
2025 *
2026 * Returns the equivalent MAY_ value
2027 */
2028static int smack_flags_to_may(int flags)
2029{
2030 int may = 0;
2031
2032 if (flags & S_IRUGO)
2033 may |= MAY_READ;
2034 if (flags & S_IWUGO)
2035 may |= MAY_WRITE;
2036 if (flags & S_IXUGO)
2037 may |= MAY_EXEC;
2038
2039 return may;
2040}
2041
2042/**
2043 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2044 * @msg: the object
2045 *
2046 * Returns 0
2047 */
2048static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2049{
Casey Schaufler676dac42010-12-02 06:43:39 -08002050 msg->security = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002051 return 0;
2052}
2053
2054/**
2055 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2056 * @msg: the object
2057 *
2058 * Clears the blob pointer
2059 */
2060static void smack_msg_msg_free_security(struct msg_msg *msg)
2061{
2062 msg->security = NULL;
2063}
2064
2065/**
2066 * smack_of_shm - the smack pointer for the shm
2067 * @shp: the object
2068 *
2069 * Returns a pointer to the smack value
2070 */
2071static char *smack_of_shm(struct shmid_kernel *shp)
2072{
2073 return (char *)shp->shm_perm.security;
2074}
2075
2076/**
2077 * smack_shm_alloc_security - Set the security blob for shm
2078 * @shp: the object
2079 *
2080 * Returns 0
2081 */
2082static int smack_shm_alloc_security(struct shmid_kernel *shp)
2083{
2084 struct kern_ipc_perm *isp = &shp->shm_perm;
2085
Casey Schaufler676dac42010-12-02 06:43:39 -08002086 isp->security = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002087 return 0;
2088}
2089
2090/**
2091 * smack_shm_free_security - Clear the security blob for shm
2092 * @shp: the object
2093 *
2094 * Clears the blob pointer
2095 */
2096static void smack_shm_free_security(struct shmid_kernel *shp)
2097{
2098 struct kern_ipc_perm *isp = &shp->shm_perm;
2099
2100 isp->security = NULL;
2101}
2102
2103/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02002104 * smk_curacc_shm : check if current has access on shm
2105 * @shp : the object
2106 * @access : access requested
2107 *
2108 * Returns 0 if current has the requested access, error code otherwise
2109 */
2110static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2111{
2112 char *ssp = smack_of_shm(shp);
2113 struct smk_audit_info ad;
2114
2115#ifdef CONFIG_AUDIT
2116 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2117 ad.a.u.ipc_id = shp->shm_perm.id;
2118#endif
2119 return smk_curacc(ssp, access, &ad);
2120}
2121
2122/**
Casey Schauflere114e472008-02-04 22:29:50 -08002123 * smack_shm_associate - Smack access check for shm
2124 * @shp: the object
2125 * @shmflg: access requested
2126 *
2127 * Returns 0 if current has the requested access, error code otherwise
2128 */
2129static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2130{
Casey Schauflere114e472008-02-04 22:29:50 -08002131 int may;
2132
2133 may = smack_flags_to_may(shmflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002134 return smk_curacc_shm(shp, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002135}
2136
2137/**
2138 * smack_shm_shmctl - Smack access check for shm
2139 * @shp: the object
2140 * @cmd: what it wants to do
2141 *
2142 * Returns 0 if current has the requested access, error code otherwise
2143 */
2144static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2145{
Casey Schauflere114e472008-02-04 22:29:50 -08002146 int may;
2147
2148 switch (cmd) {
2149 case IPC_STAT:
2150 case SHM_STAT:
2151 may = MAY_READ;
2152 break;
2153 case IPC_SET:
2154 case SHM_LOCK:
2155 case SHM_UNLOCK:
2156 case IPC_RMID:
2157 may = MAY_READWRITE;
2158 break;
2159 case IPC_INFO:
2160 case SHM_INFO:
2161 /*
2162 * System level information.
2163 */
2164 return 0;
2165 default:
2166 return -EINVAL;
2167 }
Etienne Bassetecfcc532009-04-08 20:40:06 +02002168 return smk_curacc_shm(shp, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002169}
2170
2171/**
2172 * smack_shm_shmat - Smack access for shmat
2173 * @shp: the object
2174 * @shmaddr: unused
2175 * @shmflg: access requested
2176 *
2177 * Returns 0 if current has the requested access, error code otherwise
2178 */
2179static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2180 int shmflg)
2181{
Casey Schauflere114e472008-02-04 22:29:50 -08002182 int may;
2183
2184 may = smack_flags_to_may(shmflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002185 return smk_curacc_shm(shp, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002186}
2187
2188/**
2189 * smack_of_sem - the smack pointer for the sem
2190 * @sma: the object
2191 *
2192 * Returns a pointer to the smack value
2193 */
2194static char *smack_of_sem(struct sem_array *sma)
2195{
2196 return (char *)sma->sem_perm.security;
2197}
2198
2199/**
2200 * smack_sem_alloc_security - Set the security blob for sem
2201 * @sma: the object
2202 *
2203 * Returns 0
2204 */
2205static int smack_sem_alloc_security(struct sem_array *sma)
2206{
2207 struct kern_ipc_perm *isp = &sma->sem_perm;
2208
Casey Schaufler676dac42010-12-02 06:43:39 -08002209 isp->security = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002210 return 0;
2211}
2212
2213/**
2214 * smack_sem_free_security - Clear the security blob for sem
2215 * @sma: the object
2216 *
2217 * Clears the blob pointer
2218 */
2219static void smack_sem_free_security(struct sem_array *sma)
2220{
2221 struct kern_ipc_perm *isp = &sma->sem_perm;
2222
2223 isp->security = NULL;
2224}
2225
2226/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02002227 * smk_curacc_sem : check if current has access on sem
2228 * @sma : the object
2229 * @access : access requested
2230 *
2231 * Returns 0 if current has the requested access, error code otherwise
2232 */
2233static int smk_curacc_sem(struct sem_array *sma, int access)
2234{
2235 char *ssp = smack_of_sem(sma);
2236 struct smk_audit_info ad;
2237
2238#ifdef CONFIG_AUDIT
2239 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2240 ad.a.u.ipc_id = sma->sem_perm.id;
2241#endif
2242 return smk_curacc(ssp, access, &ad);
2243}
2244
2245/**
Casey Schauflere114e472008-02-04 22:29:50 -08002246 * smack_sem_associate - Smack access check for sem
2247 * @sma: the object
2248 * @semflg: access requested
2249 *
2250 * Returns 0 if current has the requested access, error code otherwise
2251 */
2252static int smack_sem_associate(struct sem_array *sma, int semflg)
2253{
Casey Schauflere114e472008-02-04 22:29:50 -08002254 int may;
2255
2256 may = smack_flags_to_may(semflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002257 return smk_curacc_sem(sma, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002258}
2259
2260/**
2261 * smack_sem_shmctl - Smack access check for sem
2262 * @sma: the object
2263 * @cmd: what it wants to do
2264 *
2265 * Returns 0 if current has the requested access, error code otherwise
2266 */
2267static int smack_sem_semctl(struct sem_array *sma, int cmd)
2268{
Casey Schauflere114e472008-02-04 22:29:50 -08002269 int may;
2270
2271 switch (cmd) {
2272 case GETPID:
2273 case GETNCNT:
2274 case GETZCNT:
2275 case GETVAL:
2276 case GETALL:
2277 case IPC_STAT:
2278 case SEM_STAT:
2279 may = MAY_READ;
2280 break;
2281 case SETVAL:
2282 case SETALL:
2283 case IPC_RMID:
2284 case IPC_SET:
2285 may = MAY_READWRITE;
2286 break;
2287 case IPC_INFO:
2288 case SEM_INFO:
2289 /*
2290 * System level information
2291 */
2292 return 0;
2293 default:
2294 return -EINVAL;
2295 }
2296
Etienne Bassetecfcc532009-04-08 20:40:06 +02002297 return smk_curacc_sem(sma, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002298}
2299
2300/**
2301 * smack_sem_semop - Smack checks of semaphore operations
2302 * @sma: the object
2303 * @sops: unused
2304 * @nsops: unused
2305 * @alter: unused
2306 *
2307 * Treated as read and write in all cases.
2308 *
2309 * Returns 0 if access is allowed, error code otherwise
2310 */
2311static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2312 unsigned nsops, int alter)
2313{
Etienne Bassetecfcc532009-04-08 20:40:06 +02002314 return smk_curacc_sem(sma, MAY_READWRITE);
Casey Schauflere114e472008-02-04 22:29:50 -08002315}
2316
2317/**
2318 * smack_msg_alloc_security - Set the security blob for msg
2319 * @msq: the object
2320 *
2321 * Returns 0
2322 */
2323static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2324{
2325 struct kern_ipc_perm *kisp = &msq->q_perm;
2326
Casey Schaufler676dac42010-12-02 06:43:39 -08002327 kisp->security = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002328 return 0;
2329}
2330
2331/**
2332 * smack_msg_free_security - Clear the security blob for msg
2333 * @msq: the object
2334 *
2335 * Clears the blob pointer
2336 */
2337static void smack_msg_queue_free_security(struct msg_queue *msq)
2338{
2339 struct kern_ipc_perm *kisp = &msq->q_perm;
2340
2341 kisp->security = NULL;
2342}
2343
2344/**
2345 * smack_of_msq - the smack pointer for the msq
2346 * @msq: the object
2347 *
2348 * Returns a pointer to the smack value
2349 */
2350static char *smack_of_msq(struct msg_queue *msq)
2351{
2352 return (char *)msq->q_perm.security;
2353}
2354
2355/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02002356 * smk_curacc_msq : helper to check if current has access on msq
2357 * @msq : the msq
2358 * @access : access requested
2359 *
2360 * return 0 if current has access, error otherwise
2361 */
2362static int smk_curacc_msq(struct msg_queue *msq, int access)
2363{
2364 char *msp = smack_of_msq(msq);
2365 struct smk_audit_info ad;
2366
2367#ifdef CONFIG_AUDIT
2368 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2369 ad.a.u.ipc_id = msq->q_perm.id;
2370#endif
2371 return smk_curacc(msp, access, &ad);
2372}
2373
2374/**
Casey Schauflere114e472008-02-04 22:29:50 -08002375 * smack_msg_queue_associate - Smack access check for msg_queue
2376 * @msq: the object
2377 * @msqflg: access requested
2378 *
2379 * Returns 0 if current has the requested access, error code otherwise
2380 */
2381static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2382{
Casey Schauflere114e472008-02-04 22:29:50 -08002383 int may;
2384
2385 may = smack_flags_to_may(msqflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002386 return smk_curacc_msq(msq, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002387}
2388
2389/**
2390 * smack_msg_queue_msgctl - Smack access check for msg_queue
2391 * @msq: the object
2392 * @cmd: what it wants to do
2393 *
2394 * Returns 0 if current has the requested access, error code otherwise
2395 */
2396static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2397{
Casey Schauflere114e472008-02-04 22:29:50 -08002398 int may;
2399
2400 switch (cmd) {
2401 case IPC_STAT:
2402 case MSG_STAT:
2403 may = MAY_READ;
2404 break;
2405 case IPC_SET:
2406 case IPC_RMID:
2407 may = MAY_READWRITE;
2408 break;
2409 case IPC_INFO:
2410 case MSG_INFO:
2411 /*
2412 * System level information
2413 */
2414 return 0;
2415 default:
2416 return -EINVAL;
2417 }
2418
Etienne Bassetecfcc532009-04-08 20:40:06 +02002419 return smk_curacc_msq(msq, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002420}
2421
2422/**
2423 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2424 * @msq: the object
2425 * @msg: unused
2426 * @msqflg: access requested
2427 *
2428 * Returns 0 if current has the requested access, error code otherwise
2429 */
2430static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2431 int msqflg)
2432{
Etienne Bassetecfcc532009-04-08 20:40:06 +02002433 int may;
Casey Schauflere114e472008-02-04 22:29:50 -08002434
Etienne Bassetecfcc532009-04-08 20:40:06 +02002435 may = smack_flags_to_may(msqflg);
2436 return smk_curacc_msq(msq, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002437}
2438
2439/**
2440 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2441 * @msq: the object
2442 * @msg: unused
2443 * @target: unused
2444 * @type: unused
2445 * @mode: unused
2446 *
2447 * Returns 0 if current has read and write access, error code otherwise
2448 */
2449static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2450 struct task_struct *target, long type, int mode)
2451{
Etienne Bassetecfcc532009-04-08 20:40:06 +02002452 return smk_curacc_msq(msq, MAY_READWRITE);
Casey Schauflere114e472008-02-04 22:29:50 -08002453}
2454
2455/**
2456 * smack_ipc_permission - Smack access for ipc_permission()
2457 * @ipp: the object permissions
2458 * @flag: access requested
2459 *
2460 * Returns 0 if current has read and write access, error code otherwise
2461 */
2462static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2463{
2464 char *isp = ipp->security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002465 int may = smack_flags_to_may(flag);
2466 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -08002467
Etienne Bassetecfcc532009-04-08 20:40:06 +02002468#ifdef CONFIG_AUDIT
2469 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2470 ad.a.u.ipc_id = ipp->id;
2471#endif
2472 return smk_curacc(isp, may, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08002473}
2474
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10002475/**
2476 * smack_ipc_getsecid - Extract smack security id
Randy Dunlap251a2a92009-02-18 11:42:33 -08002477 * @ipp: the object permissions
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10002478 * @secid: where result will be saved
2479 */
2480static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2481{
2482 char *smack = ipp->security;
2483
2484 *secid = smack_to_secid(smack);
2485}
2486
Casey Schauflere114e472008-02-04 22:29:50 -08002487/**
2488 * smack_d_instantiate - Make sure the blob is correct on an inode
Dan Carpenter3e62cbb2010-06-01 09:14:04 +02002489 * @opt_dentry: dentry where inode will be attached
Casey Schauflere114e472008-02-04 22:29:50 -08002490 * @inode: the object
2491 *
2492 * Set the inode's security blob if it hasn't been done already.
2493 */
2494static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2495{
2496 struct super_block *sbp;
2497 struct superblock_smack *sbsp;
2498 struct inode_smack *isp;
Casey Schaufler676dac42010-12-02 06:43:39 -08002499 char *csp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002500 char *fetched;
2501 char *final;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002502 char trattr[TRANS_TRUE_SIZE];
2503 int transflag = 0;
Casey Schaufler2267b132012-03-13 19:14:19 -07002504 int rc;
Casey Schauflere114e472008-02-04 22:29:50 -08002505 struct dentry *dp;
2506
2507 if (inode == NULL)
2508 return;
2509
2510 isp = inode->i_security;
2511
2512 mutex_lock(&isp->smk_lock);
2513 /*
2514 * If the inode is already instantiated
2515 * take the quick way out
2516 */
2517 if (isp->smk_flags & SMK_INODE_INSTANT)
2518 goto unlockandout;
2519
2520 sbp = inode->i_sb;
2521 sbsp = sbp->s_security;
2522 /*
2523 * We're going to use the superblock default label
2524 * if there's no label on the file.
2525 */
2526 final = sbsp->smk_default;
2527
2528 /*
Casey Schauflere97dcb02008-06-02 10:04:32 -07002529 * If this is the root inode the superblock
2530 * may be in the process of initialization.
2531 * If that is the case use the root value out
2532 * of the superblock.
2533 */
2534 if (opt_dentry->d_parent == opt_dentry) {
2535 isp->smk_inode = sbsp->smk_root;
2536 isp->smk_flags |= SMK_INODE_INSTANT;
2537 goto unlockandout;
2538 }
2539
2540 /*
Casey Schauflere114e472008-02-04 22:29:50 -08002541 * This is pretty hackish.
2542 * Casey says that we shouldn't have to do
2543 * file system specific code, but it does help
2544 * with keeping it simple.
2545 */
2546 switch (sbp->s_magic) {
2547 case SMACK_MAGIC:
2548 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002549 * Casey says that it's a little embarrassing
Casey Schauflere114e472008-02-04 22:29:50 -08002550 * that the smack file system doesn't do
2551 * extended attributes.
2552 */
2553 final = smack_known_star.smk_known;
2554 break;
2555 case PIPEFS_MAGIC:
2556 /*
2557 * Casey says pipes are easy (?)
2558 */
2559 final = smack_known_star.smk_known;
2560 break;
2561 case DEVPTS_SUPER_MAGIC:
2562 /*
2563 * devpts seems content with the label of the task.
2564 * Programs that change smack have to treat the
2565 * pty with respect.
2566 */
2567 final = csp;
2568 break;
2569 case SOCKFS_MAGIC:
2570 /*
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002571 * Socket access is controlled by the socket
2572 * structures associated with the task involved.
Casey Schauflere114e472008-02-04 22:29:50 -08002573 */
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002574 final = smack_known_star.smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08002575 break;
2576 case PROC_SUPER_MAGIC:
2577 /*
2578 * Casey says procfs appears not to care.
2579 * The superblock default suffices.
2580 */
2581 break;
2582 case TMPFS_MAGIC:
2583 /*
2584 * Device labels should come from the filesystem,
2585 * but watch out, because they're volitile,
2586 * getting recreated on every reboot.
2587 */
2588 final = smack_known_star.smk_known;
2589 /*
2590 * No break.
2591 *
2592 * If a smack value has been set we want to use it,
2593 * but since tmpfs isn't giving us the opportunity
2594 * to set mount options simulate setting the
2595 * superblock default.
2596 */
2597 default:
2598 /*
2599 * This isn't an understood special case.
2600 * Get the value from the xattr.
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002601 */
2602
2603 /*
2604 * UNIX domain sockets use lower level socket data.
2605 */
2606 if (S_ISSOCK(inode->i_mode)) {
2607 final = smack_known_star.smk_known;
2608 break;
2609 }
2610 /*
Casey Schauflere114e472008-02-04 22:29:50 -08002611 * No xattr support means, alas, no SMACK label.
2612 * Use the aforeapplied default.
2613 * It would be curious if the label of the task
2614 * does not match that assigned.
2615 */
2616 if (inode->i_op->getxattr == NULL)
2617 break;
2618 /*
2619 * Get the dentry for xattr.
2620 */
Dan Carpenter3e62cbb2010-06-01 09:14:04 +02002621 dp = dget(opt_dentry);
Casey Schaufler676dac42010-12-02 06:43:39 -08002622 fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp);
Casey Schaufler2267b132012-03-13 19:14:19 -07002623 if (fetched != NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08002624 final = fetched;
Casey Schaufler2267b132012-03-13 19:14:19 -07002625
2626 /*
2627 * Transmuting directory
2628 */
2629 if (S_ISDIR(inode->i_mode)) {
2630 /*
2631 * If this is a new directory and the label was
2632 * transmuted when the inode was initialized
2633 * set the transmute attribute on the directory
2634 * and mark the inode.
2635 *
2636 * If there is a transmute attribute on the
2637 * directory mark the inode.
2638 */
2639 if (isp->smk_flags & SMK_INODE_CHANGED) {
2640 isp->smk_flags &= ~SMK_INODE_CHANGED;
2641 rc = inode->i_op->setxattr(dp,
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002642 XATTR_NAME_SMACKTRANSMUTE,
Casey Schaufler2267b132012-03-13 19:14:19 -07002643 TRANS_TRUE, TRANS_TRUE_SIZE,
2644 0);
2645 } else {
2646 rc = inode->i_op->getxattr(dp,
2647 XATTR_NAME_SMACKTRANSMUTE, trattr,
2648 TRANS_TRUE_SIZE);
2649 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
2650 TRANS_TRUE_SIZE) != 0)
2651 rc = -EINVAL;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002652 }
Casey Schaufler2267b132012-03-13 19:14:19 -07002653 if (rc >= 0)
2654 transflag = SMK_INODE_TRANSMUTE;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002655 }
2656 isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002657 isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
Casey Schaufler676dac42010-12-02 06:43:39 -08002658
Casey Schauflere114e472008-02-04 22:29:50 -08002659 dput(dp);
2660 break;
2661 }
2662
2663 if (final == NULL)
2664 isp->smk_inode = csp;
2665 else
2666 isp->smk_inode = final;
2667
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002668 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
Casey Schauflere114e472008-02-04 22:29:50 -08002669
2670unlockandout:
2671 mutex_unlock(&isp->smk_lock);
2672 return;
2673}
2674
2675/**
2676 * smack_getprocattr - Smack process attribute access
2677 * @p: the object task
2678 * @name: the name of the attribute in /proc/.../attr
2679 * @value: where to put the result
2680 *
2681 * Places a copy of the task Smack into value
2682 *
2683 * Returns the length of the smack label or an error code
2684 */
2685static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2686{
2687 char *cp;
2688 int slen;
2689
2690 if (strcmp(name, "current") != 0)
2691 return -EINVAL;
2692
Casey Schaufler676dac42010-12-02 06:43:39 -08002693 cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL);
Casey Schauflere114e472008-02-04 22:29:50 -08002694 if (cp == NULL)
2695 return -ENOMEM;
2696
2697 slen = strlen(cp);
2698 *value = cp;
2699 return slen;
2700}
2701
2702/**
2703 * smack_setprocattr - Smack process attribute setting
2704 * @p: the object task
2705 * @name: the name of the attribute in /proc/.../attr
2706 * @value: the value to set
2707 * @size: the size of the value
2708 *
2709 * Sets the Smack value of the task. Only setting self
2710 * is permitted and only with privilege
2711 *
2712 * Returns the length of the smack label or an error code
2713 */
2714static int smack_setprocattr(struct task_struct *p, char *name,
2715 void *value, size_t size)
2716{
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002717 int rc;
Casey Schaufler676dac42010-12-02 06:43:39 -08002718 struct task_smack *tsp;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002719 struct task_smack *oldtsp;
David Howellsd84f4f92008-11-14 10:39:23 +11002720 struct cred *new;
Casey Schauflere114e472008-02-04 22:29:50 -08002721 char *newsmack;
2722
Casey Schauflere114e472008-02-04 22:29:50 -08002723 /*
2724 * Changing another process' Smack value is too dangerous
2725 * and supports no sane use case.
2726 */
2727 if (p != current)
2728 return -EPERM;
2729
David Howells5cd9c582008-08-14 11:37:28 +01002730 if (!capable(CAP_MAC_ADMIN))
2731 return -EPERM;
2732
Casey Schauflerf7112e62012-05-06 15:22:02 -07002733 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
Casey Schauflere114e472008-02-04 22:29:50 -08002734 return -EINVAL;
2735
2736 if (strcmp(name, "current") != 0)
2737 return -EINVAL;
2738
2739 newsmack = smk_import(value, size);
2740 if (newsmack == NULL)
2741 return -EINVAL;
2742
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002743 /*
2744 * No process is ever allowed the web ("@") label.
2745 */
2746 if (newsmack == smack_known_web.smk_known)
2747 return -EPERM;
2748
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002749 oldtsp = p->cred->security;
David Howellsd84f4f92008-11-14 10:39:23 +11002750 new = prepare_creds();
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002751 if (new == NULL)
David Howellsd84f4f92008-11-14 10:39:23 +11002752 return -ENOMEM;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002753
2754 tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL);
Casey Schaufler676dac42010-12-02 06:43:39 -08002755 if (tsp == NULL) {
2756 kfree(new);
2757 return -ENOMEM;
2758 }
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002759 rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL);
2760 if (rc != 0)
2761 return rc;
2762
Casey Schaufler676dac42010-12-02 06:43:39 -08002763 new->security = tsp;
David Howellsd84f4f92008-11-14 10:39:23 +11002764 commit_creds(new);
Casey Schauflere114e472008-02-04 22:29:50 -08002765 return size;
2766}
2767
2768/**
2769 * smack_unix_stream_connect - Smack access on UDS
David S. Miller3610cda2011-01-05 15:38:53 -08002770 * @sock: one sock
2771 * @other: the other sock
Casey Schauflere114e472008-02-04 22:29:50 -08002772 * @newsk: unused
2773 *
2774 * Return 0 if a subject with the smack of sock could access
2775 * an object with the smack of other, otherwise an error code
2776 */
David S. Miller3610cda2011-01-05 15:38:53 -08002777static int smack_unix_stream_connect(struct sock *sock,
2778 struct sock *other, struct sock *newsk)
Casey Schauflere114e472008-02-04 22:29:50 -08002779{
James Morrisd2e7ad12011-01-10 09:46:24 +11002780 struct socket_smack *ssp = sock->sk_security;
2781 struct socket_smack *osp = other->sk_security;
Casey Schaufler975d5e52011-09-26 14:43:39 -07002782 struct socket_smack *nsp = newsk->sk_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002783 struct smk_audit_info ad;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002784 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08002785
Kees Cook923e9a12012-04-10 13:26:44 -07002786#ifdef CONFIG_AUDIT
2787 struct lsm_network_audit net;
2788
Eric Paris48c62af2012-04-02 13:15:44 -04002789 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
David S. Miller3610cda2011-01-05 15:38:53 -08002790 smk_ad_setfield_u_net_sk(&ad, other);
Kees Cook923e9a12012-04-10 13:26:44 -07002791#endif
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002792
2793 if (!capable(CAP_MAC_OVERRIDE))
2794 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2795
Casey Schaufler975d5e52011-09-26 14:43:39 -07002796 /*
2797 * Cross reference the peer labels for SO_PEERSEC.
2798 */
2799 if (rc == 0) {
2800 nsp->smk_packet = ssp->smk_out;
2801 ssp->smk_packet = osp->smk_out;
2802 }
2803
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002804 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08002805}
2806
2807/**
2808 * smack_unix_may_send - Smack access on UDS
2809 * @sock: one socket
2810 * @other: the other socket
2811 *
2812 * Return 0 if a subject with the smack of sock could access
2813 * an object with the smack of other, otherwise an error code
2814 */
2815static int smack_unix_may_send(struct socket *sock, struct socket *other)
2816{
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002817 struct socket_smack *ssp = sock->sk->sk_security;
2818 struct socket_smack *osp = other->sk->sk_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002819 struct smk_audit_info ad;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002820 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08002821
Kees Cook923e9a12012-04-10 13:26:44 -07002822#ifdef CONFIG_AUDIT
2823 struct lsm_network_audit net;
2824
Eric Paris48c62af2012-04-02 13:15:44 -04002825 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002826 smk_ad_setfield_u_net_sk(&ad, other->sk);
Kees Cook923e9a12012-04-10 13:26:44 -07002827#endif
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002828
2829 if (!capable(CAP_MAC_OVERRIDE))
2830 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2831
2832 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08002833}
2834
2835/**
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002836 * smack_socket_sendmsg - Smack check based on destination host
2837 * @sock: the socket
Randy Dunlap251a2a92009-02-18 11:42:33 -08002838 * @msg: the message
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002839 * @size: the size of the message
2840 *
2841 * Return 0 if the current subject can write to the destination
2842 * host. This is only a question if the destination is a single
2843 * label host.
2844 */
2845static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
2846 int size)
2847{
2848 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002849
2850 /*
2851 * Perfectly reasonable for this to be NULL
2852 */
Julia Lawallda34d422009-08-05 14:34:55 +02002853 if (sip == NULL || sip->sin_family != AF_INET)
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002854 return 0;
2855
Paul Moore07feee82009-03-27 17:10:54 -04002856 return smack_netlabel_send(sock->sk, sip);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002857}
2858
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002859/**
Randy Dunlap251a2a92009-02-18 11:42:33 -08002860 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
Casey Schauflere114e472008-02-04 22:29:50 -08002861 * @sap: netlabel secattr
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002862 * @ssp: socket security information
Casey Schauflere114e472008-02-04 22:29:50 -08002863 *
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002864 * Returns a pointer to a Smack label found on the label list.
Casey Schauflere114e472008-02-04 22:29:50 -08002865 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002866static char *smack_from_secattr(struct netlbl_lsm_secattr *sap,
2867 struct socket_smack *ssp)
Casey Schauflere114e472008-02-04 22:29:50 -08002868{
Casey Schauflerf7112e62012-05-06 15:22:02 -07002869 struct smack_known *kp;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002870 char *sp;
Casey Schauflerf7112e62012-05-06 15:22:02 -07002871 int found = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08002872
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002873 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
Casey Schauflere114e472008-02-04 22:29:50 -08002874 /*
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002875 * Looks like a CIPSO packet.
Casey Schauflere114e472008-02-04 22:29:50 -08002876 * If there are flags but no level netlabel isn't
2877 * behaving the way we expect it to.
2878 *
Casey Schauflerf7112e62012-05-06 15:22:02 -07002879 * Look it up in the label table
Casey Schauflere114e472008-02-04 22:29:50 -08002880 * Without guidance regarding the smack value
2881 * for the packet fall back on the network
2882 * ambient value.
2883 */
Casey Schauflerf7112e62012-05-06 15:22:02 -07002884 rcu_read_lock();
2885 list_for_each_entry(kp, &smack_known_list, list) {
2886 if (sap->attr.mls.lvl != kp->smk_netlabel.attr.mls.lvl)
2887 continue;
2888 if (memcmp(sap->attr.mls.cat,
2889 kp->smk_netlabel.attr.mls.cat,
2890 SMK_CIPSOLEN) != 0)
2891 continue;
2892 found = 1;
2893 break;
Casey Schauflere114e472008-02-04 22:29:50 -08002894 }
Casey Schauflerf7112e62012-05-06 15:22:02 -07002895 rcu_read_unlock();
2896
2897 if (found)
2898 return kp->smk_known;
2899
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002900 if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known)
2901 return smack_known_web.smk_known;
2902 return smack_known_star.smk_known;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002903 }
2904 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
2905 /*
2906 * Looks like a fallback, which gives us a secid.
2907 */
2908 sp = smack_from_secid(sap->attr.secid);
2909 /*
2910 * This has got to be a bug because it is
2911 * impossible to specify a fallback without
2912 * specifying the label, which will ensure
2913 * it has a secid, and the only way to get a
2914 * secid is from a fallback.
2915 */
2916 BUG_ON(sp == NULL);
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002917 return sp;
Casey Schauflere114e472008-02-04 22:29:50 -08002918 }
2919 /*
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002920 * Without guidance regarding the smack value
2921 * for the packet fall back on the network
2922 * ambient value.
Casey Schauflere114e472008-02-04 22:29:50 -08002923 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002924 return smack_net_ambient;
Casey Schauflere114e472008-02-04 22:29:50 -08002925}
2926
2927/**
2928 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2929 * @sk: socket
2930 * @skb: packet
2931 *
2932 * Returns 0 if the packet should be delivered, an error code otherwise
2933 */
2934static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
2935{
2936 struct netlbl_lsm_secattr secattr;
2937 struct socket_smack *ssp = sk->sk_security;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002938 char *csp;
Casey Schauflere114e472008-02-04 22:29:50 -08002939 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002940 struct smk_audit_info ad;
Kees Cook923e9a12012-04-10 13:26:44 -07002941#ifdef CONFIG_AUDIT
Eric Paris48c62af2012-04-02 13:15:44 -04002942 struct lsm_network_audit net;
Kees Cook923e9a12012-04-10 13:26:44 -07002943#endif
Casey Schauflere114e472008-02-04 22:29:50 -08002944 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2945 return 0;
2946
2947 /*
2948 * Translate what netlabel gave us.
2949 */
Casey Schauflere114e472008-02-04 22:29:50 -08002950 netlbl_secattr_init(&secattr);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002951
Casey Schauflere114e472008-02-04 22:29:50 -08002952 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002953 if (rc == 0)
2954 csp = smack_from_secattr(&secattr, ssp);
2955 else
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002956 csp = smack_net_ambient;
2957
Casey Schauflere114e472008-02-04 22:29:50 -08002958 netlbl_secattr_destroy(&secattr);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002959
Etienne Bassetecfcc532009-04-08 20:40:06 +02002960#ifdef CONFIG_AUDIT
Eric Paris48c62af2012-04-02 13:15:44 -04002961 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2962 ad.a.u.net->family = sk->sk_family;
2963 ad.a.u.net->netif = skb->skb_iif;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002964 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
2965#endif
Casey Schauflere114e472008-02-04 22:29:50 -08002966 /*
2967 * Receiving a packet requires that the other end
2968 * be able to write here. Read access is not required.
2969 * This is the simplist possible security model
2970 * for networking.
2971 */
Etienne Bassetecfcc532009-04-08 20:40:06 +02002972 rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad);
Paul Moorea8134292008-10-10 10:16:31 -04002973 if (rc != 0)
2974 netlbl_skbuff_err(skb, rc, 0);
2975 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08002976}
2977
2978/**
2979 * smack_socket_getpeersec_stream - pull in packet label
2980 * @sock: the socket
2981 * @optval: user's destination
2982 * @optlen: size thereof
Randy Dunlap251a2a92009-02-18 11:42:33 -08002983 * @len: max thereof
Casey Schauflere114e472008-02-04 22:29:50 -08002984 *
2985 * returns zero on success, an error code otherwise
2986 */
2987static int smack_socket_getpeersec_stream(struct socket *sock,
2988 char __user *optval,
2989 int __user *optlen, unsigned len)
2990{
2991 struct socket_smack *ssp;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002992 char *rcp = "";
2993 int slen = 1;
Casey Schauflere114e472008-02-04 22:29:50 -08002994 int rc = 0;
2995
2996 ssp = sock->sk->sk_security;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002997 if (ssp->smk_packet != NULL) {
2998 rcp = ssp->smk_packet;
2999 slen = strlen(rcp) + 1;
3000 }
Casey Schauflere114e472008-02-04 22:29:50 -08003001
3002 if (slen > len)
3003 rc = -ERANGE;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003004 else if (copy_to_user(optval, rcp, slen) != 0)
Casey Schauflere114e472008-02-04 22:29:50 -08003005 rc = -EFAULT;
3006
3007 if (put_user(slen, optlen) != 0)
3008 rc = -EFAULT;
3009
3010 return rc;
3011}
3012
3013
3014/**
3015 * smack_socket_getpeersec_dgram - pull in packet label
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003016 * @sock: the peer socket
Casey Schauflere114e472008-02-04 22:29:50 -08003017 * @skb: packet data
3018 * @secid: pointer to where to put the secid of the packet
3019 *
3020 * Sets the netlabel socket state on sk from parent
3021 */
3022static int smack_socket_getpeersec_dgram(struct socket *sock,
3023 struct sk_buff *skb, u32 *secid)
3024
3025{
3026 struct netlbl_lsm_secattr secattr;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003027 struct socket_smack *ssp = NULL;
3028 char *sp;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003029 int family = PF_UNSPEC;
3030 u32 s = 0; /* 0 is the invalid secid */
Casey Schauflere114e472008-02-04 22:29:50 -08003031 int rc;
3032
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003033 if (skb != NULL) {
3034 if (skb->protocol == htons(ETH_P_IP))
3035 family = PF_INET;
3036 else if (skb->protocol == htons(ETH_P_IPV6))
3037 family = PF_INET6;
Casey Schauflere114e472008-02-04 22:29:50 -08003038 }
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003039 if (family == PF_UNSPEC && sock != NULL)
3040 family = sock->sk->sk_family;
Casey Schauflere114e472008-02-04 22:29:50 -08003041
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003042 if (family == PF_UNIX) {
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003043 ssp = sock->sk->sk_security;
3044 s = smack_to_secid(ssp->smk_out);
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003045 } else if (family == PF_INET || family == PF_INET6) {
3046 /*
3047 * Translate what netlabel gave us.
3048 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003049 if (sock != NULL && sock->sk != NULL)
3050 ssp = sock->sk->sk_security;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003051 netlbl_secattr_init(&secattr);
3052 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3053 if (rc == 0) {
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003054 sp = smack_from_secattr(&secattr, ssp);
3055 s = smack_to_secid(sp);
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003056 }
3057 netlbl_secattr_destroy(&secattr);
3058 }
3059 *secid = s;
Casey Schauflere114e472008-02-04 22:29:50 -08003060 if (s == 0)
3061 return -EINVAL;
Casey Schauflere114e472008-02-04 22:29:50 -08003062 return 0;
3063}
3064
3065/**
Paul Moore07feee82009-03-27 17:10:54 -04003066 * smack_sock_graft - Initialize a newly created socket with an existing sock
3067 * @sk: child sock
3068 * @parent: parent socket
Casey Schauflere114e472008-02-04 22:29:50 -08003069 *
Paul Moore07feee82009-03-27 17:10:54 -04003070 * Set the smk_{in,out} state of an existing sock based on the process that
3071 * is creating the new socket.
Casey Schauflere114e472008-02-04 22:29:50 -08003072 */
3073static void smack_sock_graft(struct sock *sk, struct socket *parent)
3074{
3075 struct socket_smack *ssp;
Casey Schauflere114e472008-02-04 22:29:50 -08003076
Paul Moore07feee82009-03-27 17:10:54 -04003077 if (sk == NULL ||
3078 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
Casey Schauflere114e472008-02-04 22:29:50 -08003079 return;
3080
3081 ssp = sk->sk_security;
Casey Schaufler676dac42010-12-02 06:43:39 -08003082 ssp->smk_in = ssp->smk_out = smk_of_current();
Paul Moore07feee82009-03-27 17:10:54 -04003083 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
Casey Schauflere114e472008-02-04 22:29:50 -08003084}
3085
3086/**
3087 * smack_inet_conn_request - Smack access check on connect
3088 * @sk: socket involved
3089 * @skb: packet
3090 * @req: unused
3091 *
3092 * Returns 0 if a task with the packet label could write to
3093 * the socket, otherwise an error code
3094 */
3095static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3096 struct request_sock *req)
3097{
Paul Moore07feee82009-03-27 17:10:54 -04003098 u16 family = sk->sk_family;
Casey Schauflerf7112e62012-05-06 15:22:02 -07003099 struct smack_known *skp;
Casey Schauflere114e472008-02-04 22:29:50 -08003100 struct socket_smack *ssp = sk->sk_security;
Paul Moore07feee82009-03-27 17:10:54 -04003101 struct netlbl_lsm_secattr secattr;
3102 struct sockaddr_in addr;
3103 struct iphdr *hdr;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003104 char *sp;
Casey Schauflerf7112e62012-05-06 15:22:02 -07003105 char *hsp;
Casey Schauflere114e472008-02-04 22:29:50 -08003106 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003107 struct smk_audit_info ad;
Kees Cook923e9a12012-04-10 13:26:44 -07003108#ifdef CONFIG_AUDIT
Eric Paris48c62af2012-04-02 13:15:44 -04003109 struct lsm_network_audit net;
Kees Cook923e9a12012-04-10 13:26:44 -07003110#endif
Casey Schauflere114e472008-02-04 22:29:50 -08003111
Paul Moore07feee82009-03-27 17:10:54 -04003112 /* handle mapped IPv4 packets arriving via IPv6 sockets */
3113 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
3114 family = PF_INET;
Casey Schauflere114e472008-02-04 22:29:50 -08003115
Paul Moore07feee82009-03-27 17:10:54 -04003116 netlbl_secattr_init(&secattr);
3117 rc = netlbl_skbuff_getattr(skb, family, &secattr);
Casey Schauflere114e472008-02-04 22:29:50 -08003118 if (rc == 0)
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003119 sp = smack_from_secattr(&secattr, ssp);
Casey Schauflere114e472008-02-04 22:29:50 -08003120 else
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003121 sp = smack_known_huh.smk_known;
Paul Moore07feee82009-03-27 17:10:54 -04003122 netlbl_secattr_destroy(&secattr);
3123
Etienne Bassetecfcc532009-04-08 20:40:06 +02003124#ifdef CONFIG_AUDIT
Eric Paris48c62af2012-04-02 13:15:44 -04003125 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3126 ad.a.u.net->family = family;
3127 ad.a.u.net->netif = skb->skb_iif;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003128 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3129#endif
Casey Schauflere114e472008-02-04 22:29:50 -08003130 /*
Paul Moore07feee82009-03-27 17:10:54 -04003131 * Receiving a packet requires that the other end be able to write
3132 * here. Read access is not required.
Casey Schauflere114e472008-02-04 22:29:50 -08003133 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003134 rc = smk_access(sp, ssp->smk_in, MAY_WRITE, &ad);
Paul Moore07feee82009-03-27 17:10:54 -04003135 if (rc != 0)
3136 return rc;
3137
3138 /*
3139 * Save the peer's label in the request_sock so we can later setup
3140 * smk_packet in the child socket so that SO_PEERCRED can report it.
3141 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003142 req->peer_secid = smack_to_secid(sp);
Paul Moore07feee82009-03-27 17:10:54 -04003143
3144 /*
3145 * We need to decide if we want to label the incoming connection here
3146 * if we do we only need to label the request_sock and the stack will
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003147 * propagate the wire-label to the sock when it is created.
Paul Moore07feee82009-03-27 17:10:54 -04003148 */
3149 hdr = ip_hdr(skb);
3150 addr.sin_addr.s_addr = hdr->saddr;
3151 rcu_read_lock();
Casey Schauflerf7112e62012-05-06 15:22:02 -07003152 hsp = smack_host_label(&addr);
3153 rcu_read_unlock();
3154
3155 if (hsp == NULL) {
3156 skp = smk_find_entry(sp);
3157 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
3158 } else
Paul Moore07feee82009-03-27 17:10:54 -04003159 netlbl_req_delattr(req);
Casey Schauflere114e472008-02-04 22:29:50 -08003160
3161 return rc;
3162}
3163
Paul Moore07feee82009-03-27 17:10:54 -04003164/**
3165 * smack_inet_csk_clone - Copy the connection information to the new socket
3166 * @sk: the new socket
3167 * @req: the connection's request_sock
3168 *
3169 * Transfer the connection's peer label to the newly created socket.
3170 */
3171static void smack_inet_csk_clone(struct sock *sk,
3172 const struct request_sock *req)
3173{
3174 struct socket_smack *ssp = sk->sk_security;
Paul Moore07feee82009-03-27 17:10:54 -04003175
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003176 if (req->peer_secid != 0)
3177 ssp->smk_packet = smack_from_secid(req->peer_secid);
3178 else
3179 ssp->smk_packet = NULL;
Paul Moore07feee82009-03-27 17:10:54 -04003180}
3181
Casey Schauflere114e472008-02-04 22:29:50 -08003182/*
3183 * Key management security hooks
3184 *
3185 * Casey has not tested key support very heavily.
3186 * The permission check is most likely too restrictive.
3187 * If you care about keys please have a look.
3188 */
3189#ifdef CONFIG_KEYS
3190
3191/**
3192 * smack_key_alloc - Set the key security blob
3193 * @key: object
David Howellsd84f4f92008-11-14 10:39:23 +11003194 * @cred: the credentials to use
Casey Schauflere114e472008-02-04 22:29:50 -08003195 * @flags: unused
3196 *
3197 * No allocation required
3198 *
3199 * Returns 0
3200 */
David Howellsd84f4f92008-11-14 10:39:23 +11003201static int smack_key_alloc(struct key *key, const struct cred *cred,
Casey Schauflere114e472008-02-04 22:29:50 -08003202 unsigned long flags)
3203{
Casey Schaufler676dac42010-12-02 06:43:39 -08003204 key->security = smk_of_task(cred->security);
Casey Schauflere114e472008-02-04 22:29:50 -08003205 return 0;
3206}
3207
3208/**
3209 * smack_key_free - Clear the key security blob
3210 * @key: the object
3211 *
3212 * Clear the blob pointer
3213 */
3214static void smack_key_free(struct key *key)
3215{
3216 key->security = NULL;
3217}
3218
3219/*
3220 * smack_key_permission - Smack access on a key
3221 * @key_ref: gets to the object
David Howellsd84f4f92008-11-14 10:39:23 +11003222 * @cred: the credentials to use
Casey Schauflere114e472008-02-04 22:29:50 -08003223 * @perm: unused
3224 *
3225 * Return 0 if the task has read and write to the object,
3226 * an error code otherwise
3227 */
3228static int smack_key_permission(key_ref_t key_ref,
David Howellsd84f4f92008-11-14 10:39:23 +11003229 const struct cred *cred, key_perm_t perm)
Casey Schauflere114e472008-02-04 22:29:50 -08003230{
3231 struct key *keyp;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003232 struct smk_audit_info ad;
Casey Schaufler676dac42010-12-02 06:43:39 -08003233 char *tsp = smk_of_task(cred->security);
Casey Schauflere114e472008-02-04 22:29:50 -08003234
3235 keyp = key_ref_to_ptr(key_ref);
3236 if (keyp == NULL)
3237 return -EINVAL;
3238 /*
3239 * If the key hasn't been initialized give it access so that
3240 * it may do so.
3241 */
3242 if (keyp->security == NULL)
3243 return 0;
3244 /*
3245 * This should not occur
3246 */
Casey Schaufler676dac42010-12-02 06:43:39 -08003247 if (tsp == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08003248 return -EACCES;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003249#ifdef CONFIG_AUDIT
3250 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3251 ad.a.u.key_struct.key = keyp->serial;
3252 ad.a.u.key_struct.key_desc = keyp->description;
3253#endif
Casey Schaufler676dac42010-12-02 06:43:39 -08003254 return smk_access(tsp, keyp->security,
Etienne Bassetecfcc532009-04-08 20:40:06 +02003255 MAY_READWRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08003256}
3257#endif /* CONFIG_KEYS */
3258
3259/*
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003260 * Smack Audit hooks
3261 *
3262 * Audit requires a unique representation of each Smack specific
3263 * rule. This unique representation is used to distinguish the
3264 * object to be audited from remaining kernel objects and also
3265 * works as a glue between the audit hooks.
3266 *
3267 * Since repository entries are added but never deleted, we'll use
3268 * the smack_known label address related to the given audit rule as
3269 * the needed unique representation. This also better fits the smack
3270 * model where nearly everything is a label.
3271 */
3272#ifdef CONFIG_AUDIT
3273
3274/**
3275 * smack_audit_rule_init - Initialize a smack audit rule
3276 * @field: audit rule fields given from user-space (audit.h)
3277 * @op: required testing operator (=, !=, >, <, ...)
3278 * @rulestr: smack label to be audited
3279 * @vrule: pointer to save our own audit rule representation
3280 *
3281 * Prepare to audit cases where (@field @op @rulestr) is true.
3282 * The label to be audited is created if necessay.
3283 */
3284static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3285{
3286 char **rule = (char **)vrule;
3287 *rule = NULL;
3288
3289 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3290 return -EINVAL;
3291
Al Viro5af75d82008-12-16 05:59:26 -05003292 if (op != Audit_equal && op != Audit_not_equal)
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003293 return -EINVAL;
3294
3295 *rule = smk_import(rulestr, 0);
3296
3297 return 0;
3298}
3299
3300/**
3301 * smack_audit_rule_known - Distinguish Smack audit rules
3302 * @krule: rule of interest, in Audit kernel representation format
3303 *
3304 * This is used to filter Smack rules from remaining Audit ones.
3305 * If it's proved that this rule belongs to us, the
3306 * audit_rule_match hook will be called to do the final judgement.
3307 */
3308static int smack_audit_rule_known(struct audit_krule *krule)
3309{
3310 struct audit_field *f;
3311 int i;
3312
3313 for (i = 0; i < krule->field_count; i++) {
3314 f = &krule->fields[i];
3315
3316 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3317 return 1;
3318 }
3319
3320 return 0;
3321}
3322
3323/**
3324 * smack_audit_rule_match - Audit given object ?
3325 * @secid: security id for identifying the object to test
3326 * @field: audit rule flags given from user-space
3327 * @op: required testing operator
3328 * @vrule: smack internal rule presentation
3329 * @actx: audit context associated with the check
3330 *
3331 * The core Audit hook. It's used to take the decision of
3332 * whether to audit or not to audit a given object.
3333 */
3334static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3335 struct audit_context *actx)
3336{
3337 char *smack;
3338 char *rule = vrule;
3339
3340 if (!rule) {
Tetsuo Handaceffec552012-03-29 16:19:05 +09003341 audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003342 "Smack: missing rule\n");
3343 return -ENOENT;
3344 }
3345
3346 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3347 return 0;
3348
3349 smack = smack_from_secid(secid);
3350
3351 /*
3352 * No need to do string comparisons. If a match occurs,
3353 * both pointers will point to the same smack_known
3354 * label.
3355 */
Al Viro5af75d82008-12-16 05:59:26 -05003356 if (op == Audit_equal)
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003357 return (rule == smack);
Al Viro5af75d82008-12-16 05:59:26 -05003358 if (op == Audit_not_equal)
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003359 return (rule != smack);
3360
3361 return 0;
3362}
3363
3364/**
3365 * smack_audit_rule_free - free smack rule representation
3366 * @vrule: rule to be freed.
3367 *
3368 * No memory was allocated.
3369 */
3370static void smack_audit_rule_free(void *vrule)
3371{
3372 /* No-op */
3373}
3374
3375#endif /* CONFIG_AUDIT */
3376
Randy Dunlap251a2a92009-02-18 11:42:33 -08003377/**
Casey Schauflere114e472008-02-04 22:29:50 -08003378 * smack_secid_to_secctx - return the smack label for a secid
3379 * @secid: incoming integer
3380 * @secdata: destination
3381 * @seclen: how long it is
3382 *
3383 * Exists for networking code.
3384 */
3385static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3386{
3387 char *sp = smack_from_secid(secid);
3388
Eric Parisd5630b92010-10-13 16:24:48 -04003389 if (secdata)
3390 *secdata = sp;
Casey Schauflere114e472008-02-04 22:29:50 -08003391 *seclen = strlen(sp);
3392 return 0;
3393}
3394
Randy Dunlap251a2a92009-02-18 11:42:33 -08003395/**
Casey Schaufler4bc87e62008-02-15 15:24:25 -08003396 * smack_secctx_to_secid - return the secid for a smack label
3397 * @secdata: smack label
3398 * @seclen: how long result is
3399 * @secid: outgoing integer
3400 *
3401 * Exists for audit and networking code.
3402 */
David Howellse52c17642008-04-29 20:52:51 +01003403static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
Casey Schaufler4bc87e62008-02-15 15:24:25 -08003404{
3405 *secid = smack_to_secid(secdata);
3406 return 0;
3407}
3408
Randy Dunlap251a2a92009-02-18 11:42:33 -08003409/**
Casey Schauflere114e472008-02-04 22:29:50 -08003410 * smack_release_secctx - don't do anything.
Randy Dunlap251a2a92009-02-18 11:42:33 -08003411 * @secdata: unused
3412 * @seclen: unused
Casey Schauflere114e472008-02-04 22:29:50 -08003413 *
3414 * Exists to make sure nothing gets done, and properly
3415 */
3416static void smack_release_secctx(char *secdata, u32 seclen)
3417{
3418}
3419
David P. Quigley1ee65e32009-09-03 14:25:57 -04003420static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3421{
3422 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3423}
3424
3425static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3426{
3427 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3428}
3429
3430static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3431{
3432 int len = 0;
3433 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3434
3435 if (len < 0)
3436 return len;
3437 *ctxlen = len;
3438 return 0;
3439}
3440
Ahmed S. Darwish076c54c2008-03-06 18:09:10 +02003441struct security_operations smack_ops = {
3442 .name = "smack",
3443
Ingo Molnar9e488582009-05-07 19:26:19 +10003444 .ptrace_access_check = smack_ptrace_access_check,
David Howells5cd9c582008-08-14 11:37:28 +01003445 .ptrace_traceme = smack_ptrace_traceme,
Casey Schauflere114e472008-02-04 22:29:50 -08003446 .syslog = smack_syslog,
Casey Schauflere114e472008-02-04 22:29:50 -08003447
3448 .sb_alloc_security = smack_sb_alloc_security,
3449 .sb_free_security = smack_sb_free_security,
3450 .sb_copy_data = smack_sb_copy_data,
3451 .sb_kern_mount = smack_sb_kern_mount,
3452 .sb_statfs = smack_sb_statfs,
3453 .sb_mount = smack_sb_mount,
3454 .sb_umount = smack_sb_umount,
3455
Casey Schaufler676dac42010-12-02 06:43:39 -08003456 .bprm_set_creds = smack_bprm_set_creds,
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +03003457 .bprm_committing_creds = smack_bprm_committing_creds,
3458 .bprm_secureexec = smack_bprm_secureexec,
Casey Schaufler676dac42010-12-02 06:43:39 -08003459
Casey Schauflere114e472008-02-04 22:29:50 -08003460 .inode_alloc_security = smack_inode_alloc_security,
3461 .inode_free_security = smack_inode_free_security,
3462 .inode_init_security = smack_inode_init_security,
3463 .inode_link = smack_inode_link,
3464 .inode_unlink = smack_inode_unlink,
3465 .inode_rmdir = smack_inode_rmdir,
3466 .inode_rename = smack_inode_rename,
3467 .inode_permission = smack_inode_permission,
3468 .inode_setattr = smack_inode_setattr,
3469 .inode_getattr = smack_inode_getattr,
3470 .inode_setxattr = smack_inode_setxattr,
3471 .inode_post_setxattr = smack_inode_post_setxattr,
3472 .inode_getxattr = smack_inode_getxattr,
3473 .inode_removexattr = smack_inode_removexattr,
3474 .inode_getsecurity = smack_inode_getsecurity,
3475 .inode_setsecurity = smack_inode_setsecurity,
3476 .inode_listsecurity = smack_inode_listsecurity,
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003477 .inode_getsecid = smack_inode_getsecid,
Casey Schauflere114e472008-02-04 22:29:50 -08003478
3479 .file_permission = smack_file_permission,
3480 .file_alloc_security = smack_file_alloc_security,
3481 .file_free_security = smack_file_free_security,
3482 .file_ioctl = smack_file_ioctl,
3483 .file_lock = smack_file_lock,
3484 .file_fcntl = smack_file_fcntl,
Casey Schaufler7898e1f2011-01-17 08:05:27 -08003485 .file_mmap = smack_file_mmap,
Casey Schauflere114e472008-02-04 22:29:50 -08003486 .file_set_fowner = smack_file_set_fowner,
3487 .file_send_sigiotask = smack_file_send_sigiotask,
3488 .file_receive = smack_file_receive,
3489
Casey Schaufler531f1d42011-09-19 12:41:42 -07003490 .dentry_open = smack_dentry_open,
3491
David Howellsee18d642009-09-02 09:14:21 +01003492 .cred_alloc_blank = smack_cred_alloc_blank,
David Howellsf1752ee2008-11-14 10:39:17 +11003493 .cred_free = smack_cred_free,
David Howellsd84f4f92008-11-14 10:39:23 +11003494 .cred_prepare = smack_cred_prepare,
David Howellsee18d642009-09-02 09:14:21 +01003495 .cred_transfer = smack_cred_transfer,
David Howells3a3b7ce2008-11-14 10:39:28 +11003496 .kernel_act_as = smack_kernel_act_as,
3497 .kernel_create_files_as = smack_kernel_create_files_as,
Casey Schauflere114e472008-02-04 22:29:50 -08003498 .task_setpgid = smack_task_setpgid,
3499 .task_getpgid = smack_task_getpgid,
3500 .task_getsid = smack_task_getsid,
3501 .task_getsecid = smack_task_getsecid,
3502 .task_setnice = smack_task_setnice,
3503 .task_setioprio = smack_task_setioprio,
3504 .task_getioprio = smack_task_getioprio,
3505 .task_setscheduler = smack_task_setscheduler,
3506 .task_getscheduler = smack_task_getscheduler,
3507 .task_movememory = smack_task_movememory,
3508 .task_kill = smack_task_kill,
3509 .task_wait = smack_task_wait,
Casey Schauflere114e472008-02-04 22:29:50 -08003510 .task_to_inode = smack_task_to_inode,
3511
3512 .ipc_permission = smack_ipc_permission,
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003513 .ipc_getsecid = smack_ipc_getsecid,
Casey Schauflere114e472008-02-04 22:29:50 -08003514
3515 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
3516 .msg_msg_free_security = smack_msg_msg_free_security,
3517
3518 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
3519 .msg_queue_free_security = smack_msg_queue_free_security,
3520 .msg_queue_associate = smack_msg_queue_associate,
3521 .msg_queue_msgctl = smack_msg_queue_msgctl,
3522 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
3523 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
3524
3525 .shm_alloc_security = smack_shm_alloc_security,
3526 .shm_free_security = smack_shm_free_security,
3527 .shm_associate = smack_shm_associate,
3528 .shm_shmctl = smack_shm_shmctl,
3529 .shm_shmat = smack_shm_shmat,
3530
3531 .sem_alloc_security = smack_sem_alloc_security,
3532 .sem_free_security = smack_sem_free_security,
3533 .sem_associate = smack_sem_associate,
3534 .sem_semctl = smack_sem_semctl,
3535 .sem_semop = smack_sem_semop,
3536
Casey Schauflere114e472008-02-04 22:29:50 -08003537 .d_instantiate = smack_d_instantiate,
3538
3539 .getprocattr = smack_getprocattr,
3540 .setprocattr = smack_setprocattr,
3541
3542 .unix_stream_connect = smack_unix_stream_connect,
3543 .unix_may_send = smack_unix_may_send,
3544
3545 .socket_post_create = smack_socket_post_create,
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003546 .socket_connect = smack_socket_connect,
3547 .socket_sendmsg = smack_socket_sendmsg,
Casey Schauflere114e472008-02-04 22:29:50 -08003548 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
3549 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
3550 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
3551 .sk_alloc_security = smack_sk_alloc_security,
3552 .sk_free_security = smack_sk_free_security,
3553 .sock_graft = smack_sock_graft,
3554 .inet_conn_request = smack_inet_conn_request,
Paul Moore07feee82009-03-27 17:10:54 -04003555 .inet_csk_clone = smack_inet_csk_clone,
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003556
Casey Schauflere114e472008-02-04 22:29:50 -08003557 /* key management security hooks */
3558#ifdef CONFIG_KEYS
3559 .key_alloc = smack_key_alloc,
3560 .key_free = smack_key_free,
3561 .key_permission = smack_key_permission,
3562#endif /* CONFIG_KEYS */
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003563
3564 /* Audit hooks */
3565#ifdef CONFIG_AUDIT
3566 .audit_rule_init = smack_audit_rule_init,
3567 .audit_rule_known = smack_audit_rule_known,
3568 .audit_rule_match = smack_audit_rule_match,
3569 .audit_rule_free = smack_audit_rule_free,
3570#endif /* CONFIG_AUDIT */
3571
Casey Schauflere114e472008-02-04 22:29:50 -08003572 .secid_to_secctx = smack_secid_to_secctx,
Casey Schaufler4bc87e62008-02-15 15:24:25 -08003573 .secctx_to_secid = smack_secctx_to_secid,
Casey Schauflere114e472008-02-04 22:29:50 -08003574 .release_secctx = smack_release_secctx,
David P. Quigley1ee65e32009-09-03 14:25:57 -04003575 .inode_notifysecctx = smack_inode_notifysecctx,
3576 .inode_setsecctx = smack_inode_setsecctx,
3577 .inode_getsecctx = smack_inode_getsecctx,
Casey Schauflere114e472008-02-04 22:29:50 -08003578};
3579
Etienne Basset7198e2e2009-03-24 20:53:24 +01003580
Casey Schaufler86812bb2012-04-17 18:55:46 -07003581static __init void init_smack_known_list(void)
Etienne Basset7198e2e2009-03-24 20:53:24 +01003582{
Casey Schaufler86812bb2012-04-17 18:55:46 -07003583 /*
Casey Schaufler86812bb2012-04-17 18:55:46 -07003584 * Initialize rule list locks
3585 */
3586 mutex_init(&smack_known_huh.smk_rules_lock);
3587 mutex_init(&smack_known_hat.smk_rules_lock);
3588 mutex_init(&smack_known_floor.smk_rules_lock);
3589 mutex_init(&smack_known_star.smk_rules_lock);
3590 mutex_init(&smack_known_invalid.smk_rules_lock);
3591 mutex_init(&smack_known_web.smk_rules_lock);
3592 /*
3593 * Initialize rule lists
3594 */
3595 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
3596 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
3597 INIT_LIST_HEAD(&smack_known_star.smk_rules);
3598 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
3599 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
3600 INIT_LIST_HEAD(&smack_known_web.smk_rules);
3601 /*
3602 * Create the known labels list
3603 */
Etienne Basset7198e2e2009-03-24 20:53:24 +01003604 list_add(&smack_known_huh.list, &smack_known_list);
3605 list_add(&smack_known_hat.list, &smack_known_list);
3606 list_add(&smack_known_star.list, &smack_known_list);
3607 list_add(&smack_known_floor.list, &smack_known_list);
3608 list_add(&smack_known_invalid.list, &smack_known_list);
3609 list_add(&smack_known_web.list, &smack_known_list);
3610}
3611
Casey Schauflere114e472008-02-04 22:29:50 -08003612/**
3613 * smack_init - initialize the smack system
3614 *
3615 * Returns 0
3616 */
3617static __init int smack_init(void)
3618{
David Howellsd84f4f92008-11-14 10:39:23 +11003619 struct cred *cred;
Casey Schaufler676dac42010-12-02 06:43:39 -08003620 struct task_smack *tsp;
David Howellsd84f4f92008-11-14 10:39:23 +11003621
Casey Schaufler7898e1f2011-01-17 08:05:27 -08003622 if (!security_module_enable(&smack_ops))
3623 return 0;
3624
3625 tsp = new_task_smack(smack_known_floor.smk_known,
3626 smack_known_floor.smk_known, GFP_KERNEL);
Casey Schaufler676dac42010-12-02 06:43:39 -08003627 if (tsp == NULL)
3628 return -ENOMEM;
3629
Casey Schauflere114e472008-02-04 22:29:50 -08003630 printk(KERN_INFO "Smack: Initializing.\n");
3631
3632 /*
3633 * Set the security state for the initial task.
3634 */
David Howellsd84f4f92008-11-14 10:39:23 +11003635 cred = (struct cred *) current->cred;
Casey Schaufler676dac42010-12-02 06:43:39 -08003636 cred->security = tsp;
Casey Schauflere114e472008-02-04 22:29:50 -08003637
Casey Schaufler86812bb2012-04-17 18:55:46 -07003638 /* initialize the smack_known_list */
3639 init_smack_known_list();
Casey Schauflere114e472008-02-04 22:29:50 -08003640
3641 /*
3642 * Register with LSM
3643 */
3644 if (register_security(&smack_ops))
3645 panic("smack: Unable to register with kernel.\n");
3646
3647 return 0;
3648}
3649
3650/*
3651 * Smack requires early initialization in order to label
3652 * all processes and objects when they are created.
3653 */
3654security_initcall(smack_init);