blob: 2874c73167831f6f72cdb8aefffbf29c3aa0f7a2 [file] [log] [blame]
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 Schaufler1880eff2012-06-05 15:28:30 -0700220 if (smack_privileged(CAP_MAC_OVERRIDE))
Casey Schauflere114e472008-02-04 22:29:50 -0800221 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;
Casey Schauflere114e472008-02-04 22:29:50 -0800254
255 sb->s_security = sbsp;
256
257 return 0;
258}
259
260/**
261 * smack_sb_free_security - free a superblock blob
262 * @sb: the superblock getting the blob
263 *
264 */
265static void smack_sb_free_security(struct super_block *sb)
266{
267 kfree(sb->s_security);
268 sb->s_security = NULL;
269}
270
271/**
272 * smack_sb_copy_data - copy mount options data for processing
Casey Schauflere114e472008-02-04 22:29:50 -0800273 * @orig: where to start
Randy Dunlap251a2a92009-02-18 11:42:33 -0800274 * @smackopts: mount options string
Casey Schauflere114e472008-02-04 22:29:50 -0800275 *
276 * Returns 0 on success or -ENOMEM on error.
277 *
278 * Copy the Smack specific mount options out of the mount
279 * options list.
280 */
Eric Parise0007522008-03-05 10:31:54 -0500281static int smack_sb_copy_data(char *orig, char *smackopts)
Casey Schauflere114e472008-02-04 22:29:50 -0800282{
283 char *cp, *commap, *otheropts, *dp;
284
Casey Schauflere114e472008-02-04 22:29:50 -0800285 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
286 if (otheropts == NULL)
287 return -ENOMEM;
288
289 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
290 if (strstr(cp, SMK_FSDEFAULT) == cp)
291 dp = smackopts;
292 else if (strstr(cp, SMK_FSFLOOR) == cp)
293 dp = smackopts;
294 else if (strstr(cp, SMK_FSHAT) == cp)
295 dp = smackopts;
296 else if (strstr(cp, SMK_FSROOT) == cp)
297 dp = smackopts;
298 else
299 dp = otheropts;
300
301 commap = strchr(cp, ',');
302 if (commap != NULL)
303 *commap = '\0';
304
305 if (*dp != '\0')
306 strcat(dp, ",");
307 strcat(dp, cp);
308 }
309
310 strcpy(orig, otheropts);
311 free_page((unsigned long)otheropts);
312
313 return 0;
314}
315
316/**
317 * smack_sb_kern_mount - Smack specific mount processing
318 * @sb: the file system superblock
James Morris12204e22008-12-19 10:44:42 +1100319 * @flags: the mount flags
Casey Schauflere114e472008-02-04 22:29:50 -0800320 * @data: the smack mount options
321 *
322 * Returns 0 on success, an error code on failure
323 */
James Morris12204e22008-12-19 10:44:42 +1100324static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
Casey Schauflere114e472008-02-04 22:29:50 -0800325{
326 struct dentry *root = sb->s_root;
327 struct inode *inode = root->d_inode;
328 struct superblock_smack *sp = sb->s_security;
329 struct inode_smack *isp;
330 char *op;
331 char *commap;
332 char *nsp;
333
Casey Schauflereb982cb2012-05-23 17:46:58 -0700334 if (sp->smk_initialized != 0)
Casey Schauflere114e472008-02-04 22:29:50 -0800335 return 0;
Casey Schauflereb982cb2012-05-23 17:46:58 -0700336
Casey Schauflere114e472008-02-04 22:29:50 -0800337 sp->smk_initialized = 1;
Casey Schauflere114e472008-02-04 22:29:50 -0800338
339 for (op = data; op != NULL; op = commap) {
340 commap = strchr(op, ',');
341 if (commap != NULL)
342 *commap++ = '\0';
343
344 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
345 op += strlen(SMK_FSHAT);
346 nsp = smk_import(op, 0);
347 if (nsp != NULL)
348 sp->smk_hat = nsp;
349 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
350 op += strlen(SMK_FSFLOOR);
351 nsp = smk_import(op, 0);
352 if (nsp != NULL)
353 sp->smk_floor = nsp;
354 } else if (strncmp(op, SMK_FSDEFAULT,
355 strlen(SMK_FSDEFAULT)) == 0) {
356 op += strlen(SMK_FSDEFAULT);
357 nsp = smk_import(op, 0);
358 if (nsp != NULL)
359 sp->smk_default = nsp;
360 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
361 op += strlen(SMK_FSROOT);
362 nsp = smk_import(op, 0);
363 if (nsp != NULL)
364 sp->smk_root = nsp;
365 }
366 }
367
368 /*
369 * Initialize the root inode.
370 */
371 isp = inode->i_security;
372 if (isp == NULL)
373 inode->i_security = new_inode_smack(sp->smk_root);
374 else
375 isp->smk_inode = sp->smk_root;
376
377 return 0;
378}
379
380/**
381 * smack_sb_statfs - Smack check on statfs
382 * @dentry: identifies the file system in question
383 *
384 * Returns 0 if current can read the floor of the filesystem,
385 * and error code otherwise
386 */
387static int smack_sb_statfs(struct dentry *dentry)
388{
389 struct superblock_smack *sbp = dentry->d_sb->s_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200390 int rc;
391 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800392
Eric Parisa2694342011-04-25 13:10:27 -0400393 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200394 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
395
396 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
397 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -0800398}
399
400/**
401 * smack_sb_mount - Smack check for mounting
402 * @dev_name: unused
Randy Dunlap251a2a92009-02-18 11:42:33 -0800403 * @path: mount point
Casey Schauflere114e472008-02-04 22:29:50 -0800404 * @type: unused
405 * @flags: unused
406 * @data: unused
407 *
408 * Returns 0 if current can write the floor of the filesystem
409 * being mounted on, an error code otherwise.
410 */
Al Virob5266eb2008-03-22 17:48:24 -0400411static int smack_sb_mount(char *dev_name, struct path *path,
Casey Schauflere114e472008-02-04 22:29:50 -0800412 char *type, unsigned long flags, void *data)
413{
Al Virod8c95842011-12-07 18:16:57 -0500414 struct superblock_smack *sbp = path->dentry->d_sb->s_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200415 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800416
Eric Parisf48b7392011-04-25 12:54:27 -0400417 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200418 smk_ad_setfield_u_fs_path(&ad, *path);
419
420 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800421}
422
423/**
424 * smack_sb_umount - Smack check for unmounting
425 * @mnt: file system to unmount
426 * @flags: unused
427 *
428 * Returns 0 if current can write the floor of the filesystem
429 * being unmounted, an error code otherwise.
430 */
431static int smack_sb_umount(struct vfsmount *mnt, int flags)
432{
433 struct superblock_smack *sbp;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200434 struct smk_audit_info ad;
Eric Parisa2694342011-04-25 13:10:27 -0400435 struct path path;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200436
Eric Parisa2694342011-04-25 13:10:27 -0400437 path.dentry = mnt->mnt_root;
438 path.mnt = mnt;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200439
Eric Parisf48b7392011-04-25 12:54:27 -0400440 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
Eric Parisa2694342011-04-25 13:10:27 -0400441 smk_ad_setfield_u_fs_path(&ad, path);
Casey Schauflere114e472008-02-04 22:29:50 -0800442
Al Virod8c95842011-12-07 18:16:57 -0500443 sbp = path.dentry->d_sb->s_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200444 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800445}
446
447/*
Casey Schaufler676dac42010-12-02 06:43:39 -0800448 * BPRM hooks
449 */
450
Casey Schauflerce8a4322011-09-29 18:21:01 -0700451/**
452 * smack_bprm_set_creds - set creds for exec
453 * @bprm: the exec information
454 *
455 * Returns 0 if it gets a blob, -ENOMEM otherwise
456 */
Casey Schaufler676dac42010-12-02 06:43:39 -0800457static int smack_bprm_set_creds(struct linux_binprm *bprm)
458{
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300459 struct inode *inode = bprm->file->f_path.dentry->d_inode;
460 struct task_smack *bsp = bprm->cred->security;
Casey Schaufler676dac42010-12-02 06:43:39 -0800461 struct inode_smack *isp;
Casey Schaufler676dac42010-12-02 06:43:39 -0800462 int rc;
463
464 rc = cap_bprm_set_creds(bprm);
465 if (rc != 0)
466 return rc;
467
468 if (bprm->cred_prepared)
469 return 0;
470
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300471 isp = inode->i_security;
472 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
Casey Schaufler676dac42010-12-02 06:43:39 -0800473 return 0;
474
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300475 if (bprm->unsafe)
476 return -EPERM;
Casey Schaufler676dac42010-12-02 06:43:39 -0800477
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300478 bsp->smk_task = isp->smk_task;
479 bprm->per_clear |= PER_CLEAR_ON_SETID;
Casey Schaufler676dac42010-12-02 06:43:39 -0800480
481 return 0;
482}
483
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300484/**
485 * smack_bprm_committing_creds - Prepare to install the new credentials
486 * from bprm.
487 *
488 * @bprm: binprm for exec
489 */
490static void smack_bprm_committing_creds(struct linux_binprm *bprm)
491{
492 struct task_smack *bsp = bprm->cred->security;
493
494 if (bsp->smk_task != bsp->smk_forked)
495 current->pdeath_signal = 0;
496}
497
498/**
499 * smack_bprm_secureexec - Return the decision to use secureexec.
500 * @bprm: binprm for exec
501 *
502 * Returns 0 on success.
503 */
504static int smack_bprm_secureexec(struct linux_binprm *bprm)
505{
506 struct task_smack *tsp = current_security();
507 int ret = cap_bprm_secureexec(bprm);
508
509 if (!ret && (tsp->smk_task != tsp->smk_forked))
510 ret = 1;
511
512 return ret;
513}
514
Casey Schaufler676dac42010-12-02 06:43:39 -0800515/*
Casey Schauflere114e472008-02-04 22:29:50 -0800516 * Inode hooks
517 */
518
519/**
520 * smack_inode_alloc_security - allocate an inode blob
Randy Dunlap251a2a92009-02-18 11:42:33 -0800521 * @inode: the inode in need of a blob
Casey Schauflere114e472008-02-04 22:29:50 -0800522 *
523 * Returns 0 if it gets a blob, -ENOMEM otherwise
524 */
525static int smack_inode_alloc_security(struct inode *inode)
526{
Casey Schaufler676dac42010-12-02 06:43:39 -0800527 inode->i_security = new_inode_smack(smk_of_current());
Casey Schauflere114e472008-02-04 22:29:50 -0800528 if (inode->i_security == NULL)
529 return -ENOMEM;
530 return 0;
531}
532
533/**
534 * smack_inode_free_security - free an inode blob
Randy Dunlap251a2a92009-02-18 11:42:33 -0800535 * @inode: the inode with a blob
Casey Schauflere114e472008-02-04 22:29:50 -0800536 *
537 * Clears the blob pointer in inode
538 */
539static void smack_inode_free_security(struct inode *inode)
540{
541 kfree(inode->i_security);
542 inode->i_security = NULL;
543}
544
545/**
546 * smack_inode_init_security - copy out the smack from an inode
547 * @inode: the inode
548 * @dir: unused
Eric Paris2a7dba32011-02-01 11:05:39 -0500549 * @qstr: unused
Casey Schauflere114e472008-02-04 22:29:50 -0800550 * @name: where to put the attribute name
551 * @value: where to put the attribute value
552 * @len: where to put the length of the attribute
553 *
554 * Returns 0 if it all works out, -ENOMEM if there's no memory
555 */
556static int smack_inode_init_security(struct inode *inode, struct inode *dir,
Eric Paris2a7dba32011-02-01 11:05:39 -0500557 const struct qstr *qstr, char **name,
558 void **value, size_t *len)
Casey Schauflere114e472008-02-04 22:29:50 -0800559{
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700560 struct smack_known *skp;
Casey Schaufler2267b132012-03-13 19:14:19 -0700561 struct inode_smack *issp = inode->i_security;
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700562 char *csp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -0800563 char *isp = smk_of_inode(inode);
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200564 char *dsp = smk_of_inode(dir);
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800565 int may;
Casey Schauflere114e472008-02-04 22:29:50 -0800566
567 if (name) {
Tetsuo Handaceffec552012-03-29 16:19:05 +0900568 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_NOFS);
Casey Schauflere114e472008-02-04 22:29:50 -0800569 if (*name == NULL)
570 return -ENOMEM;
571 }
572
573 if (value) {
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700574 skp = smk_find_entry(csp);
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800575 rcu_read_lock();
Casey Schaufler272cd7a2011-09-20 12:24:36 -0700576 may = smk_access_entry(csp, dsp, &skp->smk_rules);
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800577 rcu_read_unlock();
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200578
579 /*
580 * If the access rule allows transmutation and
581 * the directory requests transmutation then
582 * by all means transmute.
Casey Schaufler2267b132012-03-13 19:14:19 -0700583 * Mark the inode as changed.
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200584 */
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800585 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
Casey Schaufler2267b132012-03-13 19:14:19 -0700586 smk_inode_transmutable(dir)) {
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200587 isp = dsp;
Casey Schaufler2267b132012-03-13 19:14:19 -0700588 issp->smk_flags |= SMK_INODE_CHANGED;
589 }
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200590
Tetsuo Handaceffec552012-03-29 16:19:05 +0900591 *value = kstrdup(isp, GFP_NOFS);
Casey Schauflere114e472008-02-04 22:29:50 -0800592 if (*value == NULL)
593 return -ENOMEM;
594 }
595
596 if (len)
597 *len = strlen(isp) + 1;
598
599 return 0;
600}
601
602/**
603 * smack_inode_link - Smack check on link
604 * @old_dentry: the existing object
605 * @dir: unused
606 * @new_dentry: the new object
607 *
608 * Returns 0 if access is permitted, an error code otherwise
609 */
610static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
611 struct dentry *new_dentry)
612{
Casey Schauflere114e472008-02-04 22:29:50 -0800613 char *isp;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200614 struct smk_audit_info ad;
615 int rc;
616
Eric Parisa2694342011-04-25 13:10:27 -0400617 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200618 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
Casey Schauflere114e472008-02-04 22:29:50 -0800619
620 isp = smk_of_inode(old_dentry->d_inode);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200621 rc = smk_curacc(isp, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800622
623 if (rc == 0 && new_dentry->d_inode != NULL) {
624 isp = smk_of_inode(new_dentry->d_inode);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200625 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
626 rc = smk_curacc(isp, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800627 }
628
629 return rc;
630}
631
632/**
633 * smack_inode_unlink - Smack check on inode deletion
634 * @dir: containing directory object
635 * @dentry: file to unlink
636 *
637 * Returns 0 if current can write the containing directory
638 * and the object, error code otherwise
639 */
640static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
641{
642 struct inode *ip = dentry->d_inode;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200643 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800644 int rc;
645
Eric Parisa2694342011-04-25 13:10:27 -0400646 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200647 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
648
Casey Schauflere114e472008-02-04 22:29:50 -0800649 /*
650 * You need write access to the thing you're unlinking
651 */
Etienne Bassetecfcc532009-04-08 20:40:06 +0200652 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
653 if (rc == 0) {
Casey Schauflere114e472008-02-04 22:29:50 -0800654 /*
655 * You also need write access to the containing directory
656 */
Etienne Bassetecfcc532009-04-08 20:40:06 +0200657 smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
658 smk_ad_setfield_u_fs_inode(&ad, dir);
659 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
660 }
Casey Schauflere114e472008-02-04 22:29:50 -0800661 return rc;
662}
663
664/**
665 * smack_inode_rmdir - Smack check on directory deletion
666 * @dir: containing directory object
667 * @dentry: directory to unlink
668 *
669 * Returns 0 if current can write the containing directory
670 * and the directory, error code otherwise
671 */
672static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
673{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200674 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800675 int rc;
676
Eric Parisa2694342011-04-25 13:10:27 -0400677 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200678 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
679
Casey Schauflere114e472008-02-04 22:29:50 -0800680 /*
681 * You need write access to the thing you're removing
682 */
Etienne Bassetecfcc532009-04-08 20:40:06 +0200683 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
684 if (rc == 0) {
Casey Schauflere114e472008-02-04 22:29:50 -0800685 /*
686 * You also need write access to the containing directory
687 */
Etienne Bassetecfcc532009-04-08 20:40:06 +0200688 smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
689 smk_ad_setfield_u_fs_inode(&ad, dir);
690 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
691 }
Casey Schauflere114e472008-02-04 22:29:50 -0800692
693 return rc;
694}
695
696/**
697 * smack_inode_rename - Smack check on rename
698 * @old_inode: the old directory
699 * @old_dentry: unused
700 * @new_inode: the new directory
701 * @new_dentry: unused
702 *
703 * Read and write access is required on both the old and
704 * new directories.
705 *
706 * Returns 0 if access is permitted, an error code otherwise
707 */
708static int smack_inode_rename(struct inode *old_inode,
709 struct dentry *old_dentry,
710 struct inode *new_inode,
711 struct dentry *new_dentry)
712{
713 int rc;
714 char *isp;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200715 struct smk_audit_info ad;
716
Eric Parisa2694342011-04-25 13:10:27 -0400717 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200718 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
Casey Schauflere114e472008-02-04 22:29:50 -0800719
720 isp = smk_of_inode(old_dentry->d_inode);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200721 rc = smk_curacc(isp, MAY_READWRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800722
723 if (rc == 0 && new_dentry->d_inode != NULL) {
724 isp = smk_of_inode(new_dentry->d_inode);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200725 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
726 rc = smk_curacc(isp, MAY_READWRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800727 }
Casey Schauflere114e472008-02-04 22:29:50 -0800728 return rc;
729}
730
731/**
732 * smack_inode_permission - Smack version of permission()
733 * @inode: the inode in question
734 * @mask: the access requested
Casey Schauflere114e472008-02-04 22:29:50 -0800735 *
736 * This is the important Smack hook.
737 *
738 * Returns 0 if access is permitted, -EACCES otherwise
739 */
Al Viroe74f71e2011-06-20 19:38:15 -0400740static int smack_inode_permission(struct inode *inode, int mask)
Casey Schauflere114e472008-02-04 22:29:50 -0800741{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200742 struct smk_audit_info ad;
Al Viroe74f71e2011-06-20 19:38:15 -0400743 int no_block = mask & MAY_NOT_BLOCK;
Eric Parisd09ca732010-07-23 11:43:57 -0400744
745 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
Casey Schauflere114e472008-02-04 22:29:50 -0800746 /*
747 * No permission to check. Existence test. Yup, it's there.
748 */
749 if (mask == 0)
750 return 0;
Andi Kleen8c9e80e2011-04-21 17:23:19 -0700751
752 /* May be droppable after audit */
Al Viroe74f71e2011-06-20 19:38:15 -0400753 if (no_block)
Andi Kleen8c9e80e2011-04-21 17:23:19 -0700754 return -ECHILD;
Eric Parisf48b7392011-04-25 12:54:27 -0400755 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200756 smk_ad_setfield_u_fs_inode(&ad, inode);
757 return smk_curacc(smk_of_inode(inode), mask, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800758}
759
760/**
761 * smack_inode_setattr - Smack check for setting attributes
762 * @dentry: the object
763 * @iattr: for the force flag
764 *
765 * Returns 0 if access is permitted, an error code otherwise
766 */
767static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
768{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200769 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800770 /*
771 * Need to allow for clearing the setuid bit.
772 */
773 if (iattr->ia_valid & ATTR_FORCE)
774 return 0;
Eric Parisa2694342011-04-25 13:10:27 -0400775 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200776 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
Casey Schauflere114e472008-02-04 22:29:50 -0800777
Etienne Bassetecfcc532009-04-08 20:40:06 +0200778 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800779}
780
781/**
782 * smack_inode_getattr - Smack check for getting attributes
783 * @mnt: unused
784 * @dentry: the object
785 *
786 * Returns 0 if access is permitted, an error code otherwise
787 */
788static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
789{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200790 struct smk_audit_info ad;
Eric Parisa2694342011-04-25 13:10:27 -0400791 struct path path;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200792
Eric Parisa2694342011-04-25 13:10:27 -0400793 path.dentry = dentry;
794 path.mnt = mnt;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200795
Eric Parisf48b7392011-04-25 12:54:27 -0400796 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
Eric Parisa2694342011-04-25 13:10:27 -0400797 smk_ad_setfield_u_fs_path(&ad, path);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200798 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800799}
800
801/**
802 * smack_inode_setxattr - Smack check for setting xattrs
803 * @dentry: the object
804 * @name: name of the attribute
805 * @value: unused
806 * @size: unused
807 * @flags: unused
808 *
809 * This protects the Smack attribute explicitly.
810 *
811 * Returns 0 if access is permitted, an error code otherwise
812 */
David Howells8f0cfa52008-04-29 00:59:41 -0700813static int smack_inode_setxattr(struct dentry *dentry, const char *name,
814 const void *value, size_t size, int flags)
Casey Schauflere114e472008-02-04 22:29:50 -0800815{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200816 struct smk_audit_info ad;
Casey Schauflerbcdca222008-02-23 15:24:04 -0800817 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -0800818
Casey Schauflerbcdca222008-02-23 15:24:04 -0800819 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
820 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
Casey Schaufler676dac42010-12-02 06:43:39 -0800821 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800822 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
823 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
Casey Schaufler1880eff2012-06-05 15:28:30 -0700824 if (!smack_privileged(CAP_MAC_ADMIN))
Casey Schauflerbcdca222008-02-23 15:24:04 -0800825 rc = -EPERM;
Etienne Bassetdefc4332009-04-16 23:58:42 +0200826 /*
827 * check label validity here so import wont fail on
828 * post_setxattr
829 */
Casey Schauflerf7112e62012-05-06 15:22:02 -0700830 if (size == 0 || size >= SMK_LONGLABEL ||
Etienne Bassetdefc4332009-04-16 23:58:42 +0200831 smk_import(value, size) == NULL)
Etienne Basset43031542009-03-27 17:11:01 -0400832 rc = -EINVAL;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200833 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
Casey Schaufler1880eff2012-06-05 15:28:30 -0700834 if (!smack_privileged(CAP_MAC_ADMIN))
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200835 rc = -EPERM;
836 if (size != TRANS_TRUE_SIZE ||
837 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
838 rc = -EINVAL;
Casey Schauflerbcdca222008-02-23 15:24:04 -0800839 } else
840 rc = cap_inode_setxattr(dentry, name, value, size, flags);
841
Eric Parisa2694342011-04-25 13:10:27 -0400842 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200843 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
844
Casey Schauflerbcdca222008-02-23 15:24:04 -0800845 if (rc == 0)
Etienne Bassetecfcc532009-04-08 20:40:06 +0200846 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
Casey Schauflerbcdca222008-02-23 15:24:04 -0800847
848 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -0800849}
850
851/**
852 * smack_inode_post_setxattr - Apply the Smack update approved above
853 * @dentry: object
854 * @name: attribute name
855 * @value: attribute value
856 * @size: attribute size
857 * @flags: unused
858 *
859 * Set the pointer in the inode blob to the entry found
860 * in the master label list.
861 */
David Howells8f0cfa52008-04-29 00:59:41 -0700862static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
863 const void *value, size_t size, int flags)
Casey Schauflere114e472008-02-04 22:29:50 -0800864{
Casey Schauflere114e472008-02-04 22:29:50 -0800865 char *nsp;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200866 struct inode_smack *isp = dentry->d_inode->i_security;
Casey Schaufler676dac42010-12-02 06:43:39 -0800867
868 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200869 nsp = smk_import(value, size);
Casey Schaufler676dac42010-12-02 06:43:39 -0800870 if (nsp != NULL)
871 isp->smk_inode = nsp;
872 else
873 isp->smk_inode = smack_known_invalid.smk_known;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200874 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
875 nsp = smk_import(value, size);
Casey Schaufler676dac42010-12-02 06:43:39 -0800876 if (nsp != NULL)
877 isp->smk_task = nsp;
878 else
879 isp->smk_task = smack_known_invalid.smk_known;
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800880 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
881 nsp = smk_import(value, size);
882 if (nsp != NULL)
883 isp->smk_mmap = nsp;
884 else
885 isp->smk_mmap = smack_known_invalid.smk_known;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200886 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
887 isp->smk_flags |= SMK_INODE_TRANSMUTE;
Casey Schauflere114e472008-02-04 22:29:50 -0800888
889 return;
890}
891
Casey Schauflerce8a4322011-09-29 18:21:01 -0700892/**
Casey Schauflere114e472008-02-04 22:29:50 -0800893 * smack_inode_getxattr - Smack check on getxattr
894 * @dentry: the object
895 * @name: unused
896 *
897 * Returns 0 if access is permitted, an error code otherwise
898 */
David Howells8f0cfa52008-04-29 00:59:41 -0700899static int smack_inode_getxattr(struct dentry *dentry, const char *name)
Casey Schauflere114e472008-02-04 22:29:50 -0800900{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200901 struct smk_audit_info ad;
902
Eric Parisa2694342011-04-25 13:10:27 -0400903 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200904 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
905
906 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800907}
908
Casey Schauflerce8a4322011-09-29 18:21:01 -0700909/**
Casey Schauflere114e472008-02-04 22:29:50 -0800910 * smack_inode_removexattr - Smack check on removexattr
911 * @dentry: the object
912 * @name: name of the attribute
913 *
914 * Removing the Smack attribute requires CAP_MAC_ADMIN
915 *
916 * Returns 0 if access is permitted, an error code otherwise
917 */
David Howells8f0cfa52008-04-29 00:59:41 -0700918static int smack_inode_removexattr(struct dentry *dentry, const char *name)
Casey Schauflere114e472008-02-04 22:29:50 -0800919{
Casey Schaufler676dac42010-12-02 06:43:39 -0800920 struct inode_smack *isp;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200921 struct smk_audit_info ad;
Casey Schauflerbcdca222008-02-23 15:24:04 -0800922 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -0800923
Casey Schauflerbcdca222008-02-23 15:24:04 -0800924 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
925 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
Casey Schaufler676dac42010-12-02 06:43:39 -0800926 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200927 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800928 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
929 strcmp(name, XATTR_NAME_SMACKMMAP)) {
Casey Schaufler1880eff2012-06-05 15:28:30 -0700930 if (!smack_privileged(CAP_MAC_ADMIN))
Casey Schauflerbcdca222008-02-23 15:24:04 -0800931 rc = -EPERM;
932 } else
933 rc = cap_inode_removexattr(dentry, name);
934
Eric Parisa2694342011-04-25 13:10:27 -0400935 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200936 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
Casey Schauflerbcdca222008-02-23 15:24:04 -0800937 if (rc == 0)
Etienne Bassetecfcc532009-04-08 20:40:06 +0200938 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
Casey Schauflerbcdca222008-02-23 15:24:04 -0800939
Casey Schaufler676dac42010-12-02 06:43:39 -0800940 if (rc == 0) {
941 isp = dentry->d_inode->i_security;
942 isp->smk_task = NULL;
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800943 isp->smk_mmap = NULL;
Casey Schaufler676dac42010-12-02 06:43:39 -0800944 }
945
Casey Schauflerbcdca222008-02-23 15:24:04 -0800946 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -0800947}
948
949/**
950 * smack_inode_getsecurity - get smack xattrs
951 * @inode: the object
952 * @name: attribute name
953 * @buffer: where to put the result
Randy Dunlap251a2a92009-02-18 11:42:33 -0800954 * @alloc: unused
Casey Schauflere114e472008-02-04 22:29:50 -0800955 *
956 * Returns the size of the attribute or an error code
957 */
958static int smack_inode_getsecurity(const struct inode *inode,
959 const char *name, void **buffer,
960 bool alloc)
961{
962 struct socket_smack *ssp;
963 struct socket *sock;
964 struct super_block *sbp;
965 struct inode *ip = (struct inode *)inode;
966 char *isp;
967 int ilen;
968 int rc = 0;
969
970 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
971 isp = smk_of_inode(inode);
972 ilen = strlen(isp) + 1;
973 *buffer = isp;
974 return ilen;
975 }
976
977 /*
978 * The rest of the Smack xattrs are only on sockets.
979 */
980 sbp = ip->i_sb;
981 if (sbp->s_magic != SOCKFS_MAGIC)
982 return -EOPNOTSUPP;
983
984 sock = SOCKET_I(ip);
Ahmed S. Darwish2e1d1462008-02-13 15:03:34 -0800985 if (sock == NULL || sock->sk == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -0800986 return -EOPNOTSUPP;
987
988 ssp = sock->sk->sk_security;
989
990 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
991 isp = ssp->smk_in;
992 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
993 isp = ssp->smk_out;
994 else
995 return -EOPNOTSUPP;
996
997 ilen = strlen(isp) + 1;
998 if (rc == 0) {
999 *buffer = isp;
1000 rc = ilen;
1001 }
1002
1003 return rc;
1004}
1005
1006
1007/**
1008 * smack_inode_listsecurity - list the Smack attributes
1009 * @inode: the object
1010 * @buffer: where they go
1011 * @buffer_size: size of buffer
1012 *
1013 * Returns 0 on success, -EINVAL otherwise
1014 */
1015static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1016 size_t buffer_size)
1017{
1018 int len = strlen(XATTR_NAME_SMACK);
1019
1020 if (buffer != NULL && len <= buffer_size) {
1021 memcpy(buffer, XATTR_NAME_SMACK, len);
1022 return len;
1023 }
1024 return -EINVAL;
1025}
1026
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10001027/**
1028 * smack_inode_getsecid - Extract inode's security id
1029 * @inode: inode to extract the info from
1030 * @secid: where result will be saved
1031 */
1032static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
1033{
1034 struct inode_smack *isp = inode->i_security;
1035
1036 *secid = smack_to_secid(isp->smk_inode);
1037}
1038
Casey Schauflere114e472008-02-04 22:29:50 -08001039/*
1040 * File Hooks
1041 */
1042
1043/**
1044 * smack_file_permission - Smack check on file operations
1045 * @file: unused
1046 * @mask: unused
1047 *
1048 * Returns 0
1049 *
1050 * Should access checks be done on each read or write?
1051 * UNICOS and SELinux say yes.
1052 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1053 *
1054 * I'll say no for now. Smack does not do the frequent
1055 * label changing that SELinux does.
1056 */
1057static int smack_file_permission(struct file *file, int mask)
1058{
1059 return 0;
1060}
1061
1062/**
1063 * smack_file_alloc_security - assign a file security blob
1064 * @file: the object
1065 *
1066 * The security blob for a file is a pointer to the master
1067 * label list, so no allocation is done.
1068 *
1069 * Returns 0
1070 */
1071static int smack_file_alloc_security(struct file *file)
1072{
Casey Schaufler676dac42010-12-02 06:43:39 -08001073 file->f_security = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08001074 return 0;
1075}
1076
1077/**
1078 * smack_file_free_security - clear a file security blob
1079 * @file: the object
1080 *
1081 * The security blob for a file is a pointer to the master
1082 * label list, so no memory is freed.
1083 */
1084static void smack_file_free_security(struct file *file)
1085{
1086 file->f_security = NULL;
1087}
1088
1089/**
1090 * smack_file_ioctl - Smack check on ioctls
1091 * @file: the object
1092 * @cmd: what to do
1093 * @arg: unused
1094 *
1095 * Relies heavily on the correct use of the ioctl command conventions.
1096 *
1097 * Returns 0 if allowed, error code otherwise
1098 */
1099static int smack_file_ioctl(struct file *file, unsigned int cmd,
1100 unsigned long arg)
1101{
1102 int rc = 0;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001103 struct smk_audit_info ad;
1104
Eric Parisf48b7392011-04-25 12:54:27 -04001105 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001106 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Casey Schauflere114e472008-02-04 22:29:50 -08001107
1108 if (_IOC_DIR(cmd) & _IOC_WRITE)
Etienne Bassetecfcc532009-04-08 20:40:06 +02001109 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001110
1111 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
Etienne Bassetecfcc532009-04-08 20:40:06 +02001112 rc = smk_curacc(file->f_security, MAY_READ, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001113
1114 return rc;
1115}
1116
1117/**
1118 * smack_file_lock - Smack check on file locking
1119 * @file: the object
Randy Dunlap251a2a92009-02-18 11:42:33 -08001120 * @cmd: unused
Casey Schauflere114e472008-02-04 22:29:50 -08001121 *
1122 * Returns 0 if current has write access, error code otherwise
1123 */
1124static int smack_file_lock(struct file *file, unsigned int cmd)
1125{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001126 struct smk_audit_info ad;
1127
Eric Paris92f42502011-04-25 13:15:55 -04001128 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1129 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001130 return smk_curacc(file->f_security, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001131}
1132
1133/**
1134 * smack_file_fcntl - Smack check on fcntl
1135 * @file: the object
1136 * @cmd: what action to check
1137 * @arg: unused
1138 *
Casey Schaufler531f1d42011-09-19 12:41:42 -07001139 * Generally these operations are harmless.
1140 * File locking operations present an obvious mechanism
1141 * for passing information, so they require write access.
1142 *
Casey Schauflere114e472008-02-04 22:29:50 -08001143 * Returns 0 if current has access, error code otherwise
1144 */
1145static int smack_file_fcntl(struct file *file, unsigned int cmd,
1146 unsigned long arg)
1147{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001148 struct smk_audit_info ad;
Casey Schaufler531f1d42011-09-19 12:41:42 -07001149 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08001150
Etienne Bassetecfcc532009-04-08 20:40:06 +02001151
Casey Schauflere114e472008-02-04 22:29:50 -08001152 switch (cmd) {
Casey Schauflere114e472008-02-04 22:29:50 -08001153 case F_GETLK:
Casey Schauflere114e472008-02-04 22:29:50 -08001154 case F_SETLK:
1155 case F_SETLKW:
1156 case F_SETOWN:
1157 case F_SETSIG:
Casey Schaufler531f1d42011-09-19 12:41:42 -07001158 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1159 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001160 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001161 break;
1162 default:
Casey Schaufler531f1d42011-09-19 12:41:42 -07001163 break;
Casey Schauflere114e472008-02-04 22:29:50 -08001164 }
1165
1166 return rc;
1167}
1168
1169/**
Al Viroe5467852012-05-30 13:30:51 -04001170 * smack_mmap_file :
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001171 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1172 * if mapping anonymous memory.
1173 * @file contains the file structure for file to map (may be NULL).
1174 * @reqprot contains the protection requested by the application.
1175 * @prot contains the protection that will be applied by the kernel.
1176 * @flags contains the operational flags.
1177 * Return 0 if permission is granted.
1178 */
Al Viroe5467852012-05-30 13:30:51 -04001179static int smack_mmap_file(struct file *file,
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001180 unsigned long reqprot, unsigned long prot,
Al Viroe5467852012-05-30 13:30:51 -04001181 unsigned long flags)
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001182{
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001183 struct smack_known *skp;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001184 struct smack_rule *srp;
1185 struct task_smack *tsp;
1186 char *sp;
1187 char *msmack;
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001188 char *osmack;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001189 struct inode_smack *isp;
1190 struct dentry *dp;
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001191 int may;
1192 int mmay;
1193 int tmay;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001194 int rc;
1195
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001196 if (file == NULL || file->f_dentry == NULL)
1197 return 0;
1198
1199 dp = file->f_dentry;
1200
1201 if (dp->d_inode == NULL)
1202 return 0;
1203
1204 isp = dp->d_inode->i_security;
1205 if (isp->smk_mmap == NULL)
1206 return 0;
1207 msmack = isp->smk_mmap;
1208
1209 tsp = current_security();
1210 sp = smk_of_current();
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001211 skp = smk_find_entry(sp);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001212 rc = 0;
1213
1214 rcu_read_lock();
1215 /*
1216 * For each Smack rule associated with the subject
1217 * label verify that the SMACK64MMAP also has access
1218 * to that rule's object label.
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001219 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001220 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001221 osmack = srp->smk_object;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001222 /*
1223 * Matching labels always allows access.
1224 */
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001225 if (msmack == osmack)
1226 continue;
1227 /*
1228 * If there is a matching local rule take
1229 * that into account as well.
1230 */
1231 may = smk_access_entry(srp->smk_subject, osmack,
1232 &tsp->smk_rules);
1233 if (may == -ENOENT)
1234 may = srp->smk_access;
1235 else
1236 may &= srp->smk_access;
1237 /*
1238 * If may is zero the SMACK64MMAP subject can't
1239 * possibly have less access.
1240 */
1241 if (may == 0)
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001242 continue;
1243
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001244 /*
1245 * Fetch the global list entry.
1246 * If there isn't one a SMACK64MMAP subject
1247 * can't have as much access as current.
1248 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001249 skp = smk_find_entry(msmack);
1250 mmay = smk_access_entry(msmack, osmack, &skp->smk_rules);
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001251 if (mmay == -ENOENT) {
1252 rc = -EACCES;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001253 break;
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001254 }
1255 /*
1256 * If there is a local entry it modifies the
1257 * potential access, too.
1258 */
1259 tmay = smk_access_entry(msmack, osmack, &tsp->smk_rules);
1260 if (tmay != -ENOENT)
1261 mmay &= tmay;
1262
1263 /*
1264 * If there is any access available to current that is
1265 * not available to a SMACK64MMAP subject
1266 * deny access.
1267 */
Casey Schaufler75a25632011-02-09 19:58:42 -08001268 if ((may | mmay) != mmay) {
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001269 rc = -EACCES;
1270 break;
1271 }
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001272 }
1273
1274 rcu_read_unlock();
1275
1276 return rc;
1277}
1278
1279/**
Casey Schauflere114e472008-02-04 22:29:50 -08001280 * smack_file_set_fowner - set the file security blob value
1281 * @file: object in question
1282 *
1283 * Returns 0
1284 * Further research may be required on this one.
1285 */
1286static int smack_file_set_fowner(struct file *file)
1287{
Casey Schaufler676dac42010-12-02 06:43:39 -08001288 file->f_security = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08001289 return 0;
1290}
1291
1292/**
1293 * smack_file_send_sigiotask - Smack on sigio
1294 * @tsk: The target task
1295 * @fown: the object the signal come from
1296 * @signum: unused
1297 *
1298 * Allow a privileged task to get signals even if it shouldn't
1299 *
1300 * Returns 0 if a subject with the object's smack could
1301 * write to the task, an error code otherwise.
1302 */
1303static int smack_file_send_sigiotask(struct task_struct *tsk,
1304 struct fown_struct *fown, int signum)
1305{
1306 struct file *file;
1307 int rc;
Casey Schaufler676dac42010-12-02 06:43:39 -08001308 char *tsp = smk_of_task(tsk->cred->security);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001309 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -08001310
1311 /*
1312 * struct fown_struct is never outside the context of a struct file
1313 */
1314 file = container_of(fown, struct file, f_owner);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001315
Etienne Bassetecfcc532009-04-08 20:40:06 +02001316 /* we don't log here as rc can be overriden */
1317 rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL);
David Howells5cd9c582008-08-14 11:37:28 +01001318 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
Etienne Bassetecfcc532009-04-08 20:40:06 +02001319 rc = 0;
1320
1321 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1322 smk_ad_setfield_u_tsk(&ad, tsk);
1323 smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001324 return rc;
1325}
1326
1327/**
1328 * smack_file_receive - Smack file receive check
1329 * @file: the object
1330 *
1331 * Returns 0 if current has access, error code otherwise
1332 */
1333static int smack_file_receive(struct file *file)
1334{
1335 int may = 0;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001336 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -08001337
Etienne Bassetecfcc532009-04-08 20:40:06 +02001338 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1339 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Casey Schauflere114e472008-02-04 22:29:50 -08001340 /*
1341 * This code relies on bitmasks.
1342 */
1343 if (file->f_mode & FMODE_READ)
1344 may = MAY_READ;
1345 if (file->f_mode & FMODE_WRITE)
1346 may |= MAY_WRITE;
1347
Etienne Bassetecfcc532009-04-08 20:40:06 +02001348 return smk_curacc(file->f_security, may, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001349}
1350
Casey Schaufler531f1d42011-09-19 12:41:42 -07001351/**
Eric Paris83d49852012-04-04 13:45:40 -04001352 * smack_file_open - Smack dentry open processing
Casey Schaufler531f1d42011-09-19 12:41:42 -07001353 * @file: the object
1354 * @cred: unused
1355 *
1356 * Set the security blob in the file structure.
1357 *
1358 * Returns 0
1359 */
Eric Paris83d49852012-04-04 13:45:40 -04001360static int smack_file_open(struct file *file, const struct cred *cred)
Casey Schaufler531f1d42011-09-19 12:41:42 -07001361{
1362 struct inode_smack *isp = file->f_path.dentry->d_inode->i_security;
1363
1364 file->f_security = isp->smk_inode;
1365
1366 return 0;
1367}
1368
Casey Schauflere114e472008-02-04 22:29:50 -08001369/*
1370 * Task hooks
1371 */
1372
1373/**
David Howellsee18d642009-09-02 09:14:21 +01001374 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1375 * @new: the new credentials
1376 * @gfp: the atomicity of any memory allocations
1377 *
1378 * Prepare a blank set of credentials for modification. This must allocate all
1379 * the memory the LSM module might require such that cred_transfer() can
1380 * complete without error.
1381 */
1382static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1383{
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001384 struct task_smack *tsp;
1385
1386 tsp = new_task_smack(NULL, NULL, gfp);
1387 if (tsp == NULL)
Casey Schaufler676dac42010-12-02 06:43:39 -08001388 return -ENOMEM;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001389
1390 cred->security = tsp;
1391
David Howellsee18d642009-09-02 09:14:21 +01001392 return 0;
1393}
1394
1395
1396/**
David Howellsf1752ee2008-11-14 10:39:17 +11001397 * smack_cred_free - "free" task-level security credentials
1398 * @cred: the credentials in question
Casey Schauflere114e472008-02-04 22:29:50 -08001399 *
Casey Schauflere114e472008-02-04 22:29:50 -08001400 */
David Howellsf1752ee2008-11-14 10:39:17 +11001401static void smack_cred_free(struct cred *cred)
Casey Schauflere114e472008-02-04 22:29:50 -08001402{
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001403 struct task_smack *tsp = cred->security;
1404 struct smack_rule *rp;
1405 struct list_head *l;
1406 struct list_head *n;
1407
1408 if (tsp == NULL)
1409 return;
1410 cred->security = NULL;
1411
1412 list_for_each_safe(l, n, &tsp->smk_rules) {
1413 rp = list_entry(l, struct smack_rule, list);
1414 list_del(&rp->list);
1415 kfree(rp);
1416 }
1417 kfree(tsp);
Casey Schauflere114e472008-02-04 22:29:50 -08001418}
1419
1420/**
David Howellsd84f4f92008-11-14 10:39:23 +11001421 * smack_cred_prepare - prepare new set of credentials for modification
1422 * @new: the new credentials
1423 * @old: the original credentials
1424 * @gfp: the atomicity of any memory allocations
1425 *
1426 * Prepare a new set of credentials for modification.
1427 */
1428static int smack_cred_prepare(struct cred *new, const struct cred *old,
1429 gfp_t gfp)
1430{
Casey Schaufler676dac42010-12-02 06:43:39 -08001431 struct task_smack *old_tsp = old->security;
1432 struct task_smack *new_tsp;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001433 int rc;
Casey Schaufler676dac42010-12-02 06:43:39 -08001434
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001435 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
Casey Schaufler676dac42010-12-02 06:43:39 -08001436 if (new_tsp == NULL)
1437 return -ENOMEM;
1438
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001439 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1440 if (rc != 0)
1441 return rc;
1442
Casey Schaufler676dac42010-12-02 06:43:39 -08001443 new->security = new_tsp;
David Howellsd84f4f92008-11-14 10:39:23 +11001444 return 0;
1445}
1446
Randy Dunlap251a2a92009-02-18 11:42:33 -08001447/**
David Howellsee18d642009-09-02 09:14:21 +01001448 * smack_cred_transfer - Transfer the old credentials to the new credentials
1449 * @new: the new credentials
1450 * @old: the original credentials
1451 *
1452 * Fill in a set of blank credentials from another set of credentials.
1453 */
1454static void smack_cred_transfer(struct cred *new, const struct cred *old)
1455{
Casey Schaufler676dac42010-12-02 06:43:39 -08001456 struct task_smack *old_tsp = old->security;
1457 struct task_smack *new_tsp = new->security;
1458
1459 new_tsp->smk_task = old_tsp->smk_task;
1460 new_tsp->smk_forked = old_tsp->smk_task;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001461 mutex_init(&new_tsp->smk_rules_lock);
1462 INIT_LIST_HEAD(&new_tsp->smk_rules);
1463
1464
1465 /* cbs copy rule list */
David Howellsee18d642009-09-02 09:14:21 +01001466}
1467
1468/**
David Howells3a3b7ce2008-11-14 10:39:28 +11001469 * smack_kernel_act_as - Set the subjective context in a set of credentials
Randy Dunlap251a2a92009-02-18 11:42:33 -08001470 * @new: points to the set of credentials to be modified.
1471 * @secid: specifies the security ID to be set
David Howells3a3b7ce2008-11-14 10:39:28 +11001472 *
1473 * Set the security data for a kernel service.
1474 */
1475static int smack_kernel_act_as(struct cred *new, u32 secid)
1476{
Casey Schaufler676dac42010-12-02 06:43:39 -08001477 struct task_smack *new_tsp = new->security;
David Howells3a3b7ce2008-11-14 10:39:28 +11001478 char *smack = smack_from_secid(secid);
1479
1480 if (smack == NULL)
1481 return -EINVAL;
1482
Casey Schaufler676dac42010-12-02 06:43:39 -08001483 new_tsp->smk_task = smack;
David Howells3a3b7ce2008-11-14 10:39:28 +11001484 return 0;
1485}
1486
1487/**
1488 * smack_kernel_create_files_as - Set the file creation label in a set of creds
Randy Dunlap251a2a92009-02-18 11:42:33 -08001489 * @new: points to the set of credentials to be modified
1490 * @inode: points to the inode to use as a reference
David Howells3a3b7ce2008-11-14 10:39:28 +11001491 *
1492 * Set the file creation context in a set of credentials to the same
1493 * as the objective context of the specified inode
1494 */
1495static int smack_kernel_create_files_as(struct cred *new,
1496 struct inode *inode)
1497{
1498 struct inode_smack *isp = inode->i_security;
Casey Schaufler676dac42010-12-02 06:43:39 -08001499 struct task_smack *tsp = new->security;
David Howells3a3b7ce2008-11-14 10:39:28 +11001500
Casey Schaufler676dac42010-12-02 06:43:39 -08001501 tsp->smk_forked = isp->smk_inode;
1502 tsp->smk_task = isp->smk_inode;
David Howells3a3b7ce2008-11-14 10:39:28 +11001503 return 0;
1504}
1505
1506/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02001507 * smk_curacc_on_task - helper to log task related access
1508 * @p: the task object
Casey Schaufler531f1d42011-09-19 12:41:42 -07001509 * @access: the access requested
1510 * @caller: name of the calling function for audit
Etienne Bassetecfcc532009-04-08 20:40:06 +02001511 *
1512 * Return 0 if access is permitted
1513 */
Casey Schaufler531f1d42011-09-19 12:41:42 -07001514static int smk_curacc_on_task(struct task_struct *p, int access,
1515 const char *caller)
Etienne Bassetecfcc532009-04-08 20:40:06 +02001516{
1517 struct smk_audit_info ad;
1518
Casey Schaufler531f1d42011-09-19 12:41:42 -07001519 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001520 smk_ad_setfield_u_tsk(&ad, p);
Casey Schaufler676dac42010-12-02 06:43:39 -08001521 return smk_curacc(smk_of_task(task_security(p)), access, &ad);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001522}
1523
1524/**
Casey Schauflere114e472008-02-04 22:29:50 -08001525 * smack_task_setpgid - Smack check on setting pgid
1526 * @p: the task object
1527 * @pgid: unused
1528 *
1529 * Return 0 if write access is permitted
1530 */
1531static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1532{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001533 return smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001534}
1535
1536/**
1537 * smack_task_getpgid - Smack access check for getpgid
1538 * @p: the object task
1539 *
1540 * Returns 0 if current can read the object task, error code otherwise
1541 */
1542static int smack_task_getpgid(struct task_struct *p)
1543{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001544 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001545}
1546
1547/**
1548 * smack_task_getsid - Smack access check for getsid
1549 * @p: the object task
1550 *
1551 * Returns 0 if current can read the object task, error code otherwise
1552 */
1553static int smack_task_getsid(struct task_struct *p)
1554{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001555 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001556}
1557
1558/**
1559 * smack_task_getsecid - get the secid of the task
1560 * @p: the object task
1561 * @secid: where to put the result
1562 *
1563 * Sets the secid to contain a u32 version of the smack label.
1564 */
1565static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1566{
Casey Schaufler676dac42010-12-02 06:43:39 -08001567 *secid = smack_to_secid(smk_of_task(task_security(p)));
Casey Schauflere114e472008-02-04 22:29:50 -08001568}
1569
1570/**
1571 * smack_task_setnice - Smack check on setting nice
1572 * @p: the task object
1573 * @nice: unused
1574 *
1575 * Return 0 if write access is permitted
1576 */
1577static int smack_task_setnice(struct task_struct *p, int nice)
1578{
Casey Schauflerbcdca222008-02-23 15:24:04 -08001579 int rc;
1580
1581 rc = cap_task_setnice(p, nice);
1582 if (rc == 0)
Casey Schaufler531f1d42011-09-19 12:41:42 -07001583 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflerbcdca222008-02-23 15:24:04 -08001584 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001585}
1586
1587/**
1588 * smack_task_setioprio - Smack check on setting ioprio
1589 * @p: the task object
1590 * @ioprio: unused
1591 *
1592 * Return 0 if write access is permitted
1593 */
1594static int smack_task_setioprio(struct task_struct *p, int ioprio)
1595{
Casey Schauflerbcdca222008-02-23 15:24:04 -08001596 int rc;
1597
1598 rc = cap_task_setioprio(p, ioprio);
1599 if (rc == 0)
Casey Schaufler531f1d42011-09-19 12:41:42 -07001600 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflerbcdca222008-02-23 15:24:04 -08001601 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001602}
1603
1604/**
1605 * smack_task_getioprio - Smack check on reading ioprio
1606 * @p: the task object
1607 *
1608 * Return 0 if read access is permitted
1609 */
1610static int smack_task_getioprio(struct task_struct *p)
1611{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001612 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001613}
1614
1615/**
1616 * smack_task_setscheduler - Smack check on setting scheduler
1617 * @p: the task object
1618 * @policy: unused
1619 * @lp: unused
1620 *
1621 * Return 0 if read access is permitted
1622 */
KOSAKI Motohirob0ae1982010-10-15 04:21:18 +09001623static int smack_task_setscheduler(struct task_struct *p)
Casey Schauflere114e472008-02-04 22:29:50 -08001624{
Casey Schauflerbcdca222008-02-23 15:24:04 -08001625 int rc;
1626
KOSAKI Motohirob0ae1982010-10-15 04:21:18 +09001627 rc = cap_task_setscheduler(p);
Casey Schauflerbcdca222008-02-23 15:24:04 -08001628 if (rc == 0)
Casey Schaufler531f1d42011-09-19 12:41:42 -07001629 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflerbcdca222008-02-23 15:24:04 -08001630 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001631}
1632
1633/**
1634 * smack_task_getscheduler - Smack check on reading scheduler
1635 * @p: the task object
1636 *
1637 * Return 0 if read access is permitted
1638 */
1639static int smack_task_getscheduler(struct task_struct *p)
1640{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001641 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001642}
1643
1644/**
1645 * smack_task_movememory - Smack check on moving memory
1646 * @p: the task object
1647 *
1648 * Return 0 if write access is permitted
1649 */
1650static int smack_task_movememory(struct task_struct *p)
1651{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001652 return smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001653}
1654
1655/**
1656 * smack_task_kill - Smack check on signal delivery
1657 * @p: the task object
1658 * @info: unused
1659 * @sig: unused
1660 * @secid: identifies the smack to use in lieu of current's
1661 *
1662 * Return 0 if write access is permitted
1663 *
1664 * The secid behavior is an artifact of an SELinux hack
1665 * in the USB code. Someday it may go away.
1666 */
1667static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1668 int sig, u32 secid)
1669{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001670 struct smk_audit_info ad;
1671
1672 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1673 smk_ad_setfield_u_tsk(&ad, p);
Casey Schauflere114e472008-02-04 22:29:50 -08001674 /*
Casey Schauflere114e472008-02-04 22:29:50 -08001675 * Sending a signal requires that the sender
1676 * can write the receiver.
1677 */
1678 if (secid == 0)
Casey Schaufler676dac42010-12-02 06:43:39 -08001679 return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE,
1680 &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001681 /*
1682 * If the secid isn't 0 we're dealing with some USB IO
1683 * specific behavior. This is not clean. For one thing
1684 * we can't take privilege into account.
1685 */
Casey Schaufler676dac42010-12-02 06:43:39 -08001686 return smk_access(smack_from_secid(secid),
1687 smk_of_task(task_security(p)), MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001688}
1689
1690/**
1691 * smack_task_wait - Smack access check for waiting
1692 * @p: task to wait for
1693 *
Casey Schauflerc00bedb2012-08-09 17:46:38 -07001694 * Returns 0
Casey Schauflere114e472008-02-04 22:29:50 -08001695 */
1696static int smack_task_wait(struct task_struct *p)
1697{
Casey Schauflere114e472008-02-04 22:29:50 -08001698 /*
Casey Schauflerc00bedb2012-08-09 17:46:38 -07001699 * Allow the operation to succeed.
1700 * Zombies are bad.
1701 * In userless environments (e.g. phones) programs
1702 * get marked with SMACK64EXEC and even if the parent
1703 * and child shouldn't be talking the parent still
1704 * may expect to know when the child exits.
Casey Schauflere114e472008-02-04 22:29:50 -08001705 */
Casey Schauflerc00bedb2012-08-09 17:46:38 -07001706 return 0;
Casey Schauflere114e472008-02-04 22:29:50 -08001707}
1708
1709/**
1710 * smack_task_to_inode - copy task smack into the inode blob
1711 * @p: task to copy from
Randy Dunlap251a2a92009-02-18 11:42:33 -08001712 * @inode: inode to copy to
Casey Schauflere114e472008-02-04 22:29:50 -08001713 *
1714 * Sets the smack pointer in the inode security blob
1715 */
1716static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1717{
1718 struct inode_smack *isp = inode->i_security;
Casey Schaufler676dac42010-12-02 06:43:39 -08001719 isp->smk_inode = smk_of_task(task_security(p));
Casey Schauflere114e472008-02-04 22:29:50 -08001720}
1721
1722/*
1723 * Socket hooks.
1724 */
1725
1726/**
1727 * smack_sk_alloc_security - Allocate a socket blob
1728 * @sk: the socket
1729 * @family: unused
Randy Dunlap251a2a92009-02-18 11:42:33 -08001730 * @gfp_flags: memory allocation flags
Casey Schauflere114e472008-02-04 22:29:50 -08001731 *
1732 * Assign Smack pointers to current
1733 *
1734 * Returns 0 on success, -ENOMEM is there's no memory
1735 */
1736static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1737{
Casey Schaufler676dac42010-12-02 06:43:39 -08001738 char *csp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08001739 struct socket_smack *ssp;
1740
1741 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1742 if (ssp == NULL)
1743 return -ENOMEM;
1744
1745 ssp->smk_in = csp;
1746 ssp->smk_out = csp;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001747 ssp->smk_packet = NULL;
Casey Schauflere114e472008-02-04 22:29:50 -08001748
1749 sk->sk_security = ssp;
1750
1751 return 0;
1752}
1753
1754/**
1755 * smack_sk_free_security - Free a socket blob
1756 * @sk: the socket
1757 *
1758 * Clears the blob pointer
1759 */
1760static void smack_sk_free_security(struct sock *sk)
1761{
1762 kfree(sk->sk_security);
1763}
1764
1765/**
Paul Moore07feee82009-03-27 17:10:54 -04001766* smack_host_label - check host based restrictions
1767* @sip: the object end
1768*
1769* looks for host based access restrictions
1770*
1771* This version will only be appropriate for really small sets of single label
1772* hosts. The caller is responsible for ensuring that the RCU read lock is
1773* taken before calling this function.
1774*
1775* Returns the label of the far end or NULL if it's not special.
1776*/
1777static char *smack_host_label(struct sockaddr_in *sip)
1778{
1779 struct smk_netlbladdr *snp;
1780 struct in_addr *siap = &sip->sin_addr;
1781
1782 if (siap->s_addr == 0)
1783 return NULL;
1784
1785 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1786 /*
1787 * we break after finding the first match because
1788 * the list is sorted from longest to shortest mask
1789 * so we have found the most specific match
1790 */
1791 if ((&snp->smk_host.sin_addr)->s_addr ==
Etienne Basset43031542009-03-27 17:11:01 -04001792 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1793 /* we have found the special CIPSO option */
1794 if (snp->smk_label == smack_cipso_option)
1795 return NULL;
Paul Moore07feee82009-03-27 17:10:54 -04001796 return snp->smk_label;
Etienne Basset43031542009-03-27 17:11:01 -04001797 }
Paul Moore07feee82009-03-27 17:10:54 -04001798
1799 return NULL;
1800}
1801
1802/**
Casey Schauflere114e472008-02-04 22:29:50 -08001803 * smack_netlabel - Set the secattr on a socket
1804 * @sk: the socket
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001805 * @labeled: socket label scheme
Casey Schauflere114e472008-02-04 22:29:50 -08001806 *
1807 * Convert the outbound smack value (smk_out) to a
1808 * secattr and attach it to the socket.
1809 *
1810 * Returns 0 on success or an error code
1811 */
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001812static int smack_netlabel(struct sock *sk, int labeled)
Casey Schauflere114e472008-02-04 22:29:50 -08001813{
Casey Schauflerf7112e62012-05-06 15:22:02 -07001814 struct smack_known *skp;
Paul Moore07feee82009-03-27 17:10:54 -04001815 struct socket_smack *ssp = sk->sk_security;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001816 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08001817
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001818 /*
1819 * Usually the netlabel code will handle changing the
1820 * packet labeling based on the label.
1821 * The case of a single label host is different, because
1822 * a single label host should never get a labeled packet
1823 * even though the label is usually associated with a packet
1824 * label.
1825 */
1826 local_bh_disable();
1827 bh_lock_sock_nested(sk);
1828
1829 if (ssp->smk_out == smack_net_ambient ||
1830 labeled == SMACK_UNLABELED_SOCKET)
1831 netlbl_sock_delattr(sk);
1832 else {
Casey Schauflerf7112e62012-05-06 15:22:02 -07001833 skp = smk_find_entry(ssp->smk_out);
1834 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001835 }
1836
1837 bh_unlock_sock(sk);
1838 local_bh_enable();
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001839
Casey Schauflere114e472008-02-04 22:29:50 -08001840 return rc;
1841}
1842
1843/**
Paul Moore07feee82009-03-27 17:10:54 -04001844 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1845 * @sk: the socket
1846 * @sap: the destination address
1847 *
1848 * Set the correct secattr for the given socket based on the destination
1849 * address and perform any outbound access checks needed.
1850 *
1851 * Returns 0 on success or an error code.
1852 *
1853 */
1854static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1855{
1856 int rc;
1857 int sk_lbl;
1858 char *hostsp;
1859 struct socket_smack *ssp = sk->sk_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001860 struct smk_audit_info ad;
Paul Moore07feee82009-03-27 17:10:54 -04001861
1862 rcu_read_lock();
1863 hostsp = smack_host_label(sap);
1864 if (hostsp != NULL) {
Etienne Bassetecfcc532009-04-08 20:40:06 +02001865#ifdef CONFIG_AUDIT
Kees Cook923e9a12012-04-10 13:26:44 -07001866 struct lsm_network_audit net;
1867
Eric Paris48c62af2012-04-02 13:15:44 -04001868 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
1869 ad.a.u.net->family = sap->sin_family;
1870 ad.a.u.net->dport = sap->sin_port;
1871 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001872#endif
Kees Cook923e9a12012-04-10 13:26:44 -07001873 sk_lbl = SMACK_UNLABELED_SOCKET;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001874 rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad);
Paul Moore07feee82009-03-27 17:10:54 -04001875 } else {
1876 sk_lbl = SMACK_CIPSO_SOCKET;
1877 rc = 0;
1878 }
1879 rcu_read_unlock();
1880 if (rc != 0)
1881 return rc;
1882
1883 return smack_netlabel(sk, sk_lbl);
1884}
1885
1886/**
Casey Schauflere114e472008-02-04 22:29:50 -08001887 * smack_inode_setsecurity - set smack xattrs
1888 * @inode: the object
1889 * @name: attribute name
1890 * @value: attribute value
1891 * @size: size of the attribute
1892 * @flags: unused
1893 *
1894 * Sets the named attribute in the appropriate blob
1895 *
1896 * Returns 0 on success, or an error code
1897 */
1898static int smack_inode_setsecurity(struct inode *inode, const char *name,
1899 const void *value, size_t size, int flags)
1900{
1901 char *sp;
1902 struct inode_smack *nsp = inode->i_security;
1903 struct socket_smack *ssp;
1904 struct socket *sock;
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001905 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08001906
Casey Schauflerf7112e62012-05-06 15:22:02 -07001907 if (value == NULL || size > SMK_LONGLABEL || size == 0)
Casey Schauflere114e472008-02-04 22:29:50 -08001908 return -EACCES;
1909
1910 sp = smk_import(value, size);
1911 if (sp == NULL)
1912 return -EINVAL;
1913
1914 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1915 nsp->smk_inode = sp;
David P. Quigleyddd29ec2009-09-09 14:25:37 -04001916 nsp->smk_flags |= SMK_INODE_INSTANT;
Casey Schauflere114e472008-02-04 22:29:50 -08001917 return 0;
1918 }
1919 /*
1920 * The rest of the Smack xattrs are only on sockets.
1921 */
1922 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
1923 return -EOPNOTSUPP;
1924
1925 sock = SOCKET_I(inode);
Ahmed S. Darwish2e1d1462008-02-13 15:03:34 -08001926 if (sock == NULL || sock->sk == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08001927 return -EOPNOTSUPP;
1928
1929 ssp = sock->sk->sk_security;
1930
1931 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1932 ssp->smk_in = sp;
1933 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
1934 ssp->smk_out = sp;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08001935 if (sock->sk->sk_family != PF_UNIX) {
1936 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1937 if (rc != 0)
1938 printk(KERN_WARNING
1939 "Smack: \"%s\" netlbl error %d.\n",
1940 __func__, -rc);
1941 }
Casey Schauflere114e472008-02-04 22:29:50 -08001942 } else
1943 return -EOPNOTSUPP;
1944
1945 return 0;
1946}
1947
1948/**
1949 * smack_socket_post_create - finish socket setup
1950 * @sock: the socket
1951 * @family: protocol family
1952 * @type: unused
1953 * @protocol: unused
1954 * @kern: unused
1955 *
1956 * Sets the netlabel information on the socket
1957 *
1958 * Returns 0 on success, and error code otherwise
1959 */
1960static int smack_socket_post_create(struct socket *sock, int family,
1961 int type, int protocol, int kern)
1962{
Ahmed S. Darwish2e1d1462008-02-13 15:03:34 -08001963 if (family != PF_INET || sock->sk == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08001964 return 0;
1965 /*
1966 * Set the outbound netlbl.
1967 */
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001968 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1969}
1970
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001971/**
1972 * smack_socket_connect - connect access check
1973 * @sock: the socket
1974 * @sap: the other end
1975 * @addrlen: size of sap
1976 *
1977 * Verifies that a connection may be possible
1978 *
1979 * Returns 0 on success, and error code otherwise
1980 */
1981static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
1982 int addrlen)
1983{
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001984 if (sock->sk == NULL || sock->sk->sk_family != PF_INET)
1985 return 0;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001986 if (addrlen < sizeof(struct sockaddr_in))
1987 return -EINVAL;
1988
Paul Moore07feee82009-03-27 17:10:54 -04001989 return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
Casey Schauflere114e472008-02-04 22:29:50 -08001990}
1991
1992/**
1993 * smack_flags_to_may - convert S_ to MAY_ values
1994 * @flags: the S_ value
1995 *
1996 * Returns the equivalent MAY_ value
1997 */
1998static int smack_flags_to_may(int flags)
1999{
2000 int may = 0;
2001
2002 if (flags & S_IRUGO)
2003 may |= MAY_READ;
2004 if (flags & S_IWUGO)
2005 may |= MAY_WRITE;
2006 if (flags & S_IXUGO)
2007 may |= MAY_EXEC;
2008
2009 return may;
2010}
2011
2012/**
2013 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2014 * @msg: the object
2015 *
2016 * Returns 0
2017 */
2018static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2019{
Casey Schaufler676dac42010-12-02 06:43:39 -08002020 msg->security = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002021 return 0;
2022}
2023
2024/**
2025 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2026 * @msg: the object
2027 *
2028 * Clears the blob pointer
2029 */
2030static void smack_msg_msg_free_security(struct msg_msg *msg)
2031{
2032 msg->security = NULL;
2033}
2034
2035/**
2036 * smack_of_shm - the smack pointer for the shm
2037 * @shp: the object
2038 *
2039 * Returns a pointer to the smack value
2040 */
2041static char *smack_of_shm(struct shmid_kernel *shp)
2042{
2043 return (char *)shp->shm_perm.security;
2044}
2045
2046/**
2047 * smack_shm_alloc_security - Set the security blob for shm
2048 * @shp: the object
2049 *
2050 * Returns 0
2051 */
2052static int smack_shm_alloc_security(struct shmid_kernel *shp)
2053{
2054 struct kern_ipc_perm *isp = &shp->shm_perm;
2055
Casey Schaufler676dac42010-12-02 06:43:39 -08002056 isp->security = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002057 return 0;
2058}
2059
2060/**
2061 * smack_shm_free_security - Clear the security blob for shm
2062 * @shp: the object
2063 *
2064 * Clears the blob pointer
2065 */
2066static void smack_shm_free_security(struct shmid_kernel *shp)
2067{
2068 struct kern_ipc_perm *isp = &shp->shm_perm;
2069
2070 isp->security = NULL;
2071}
2072
2073/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02002074 * smk_curacc_shm : check if current has access on shm
2075 * @shp : the object
2076 * @access : access requested
2077 *
2078 * Returns 0 if current has the requested access, error code otherwise
2079 */
2080static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2081{
2082 char *ssp = smack_of_shm(shp);
2083 struct smk_audit_info ad;
2084
2085#ifdef CONFIG_AUDIT
2086 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2087 ad.a.u.ipc_id = shp->shm_perm.id;
2088#endif
2089 return smk_curacc(ssp, access, &ad);
2090}
2091
2092/**
Casey Schauflere114e472008-02-04 22:29:50 -08002093 * smack_shm_associate - Smack access check for shm
2094 * @shp: the object
2095 * @shmflg: access requested
2096 *
2097 * Returns 0 if current has the requested access, error code otherwise
2098 */
2099static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2100{
Casey Schauflere114e472008-02-04 22:29:50 -08002101 int may;
2102
2103 may = smack_flags_to_may(shmflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002104 return smk_curacc_shm(shp, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002105}
2106
2107/**
2108 * smack_shm_shmctl - Smack access check for shm
2109 * @shp: the object
2110 * @cmd: what it wants to do
2111 *
2112 * Returns 0 if current has the requested access, error code otherwise
2113 */
2114static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2115{
Casey Schauflere114e472008-02-04 22:29:50 -08002116 int may;
2117
2118 switch (cmd) {
2119 case IPC_STAT:
2120 case SHM_STAT:
2121 may = MAY_READ;
2122 break;
2123 case IPC_SET:
2124 case SHM_LOCK:
2125 case SHM_UNLOCK:
2126 case IPC_RMID:
2127 may = MAY_READWRITE;
2128 break;
2129 case IPC_INFO:
2130 case SHM_INFO:
2131 /*
2132 * System level information.
2133 */
2134 return 0;
2135 default:
2136 return -EINVAL;
2137 }
Etienne Bassetecfcc532009-04-08 20:40:06 +02002138 return smk_curacc_shm(shp, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002139}
2140
2141/**
2142 * smack_shm_shmat - Smack access for shmat
2143 * @shp: the object
2144 * @shmaddr: unused
2145 * @shmflg: access requested
2146 *
2147 * Returns 0 if current has the requested access, error code otherwise
2148 */
2149static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2150 int shmflg)
2151{
Casey Schauflere114e472008-02-04 22:29:50 -08002152 int may;
2153
2154 may = smack_flags_to_may(shmflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002155 return smk_curacc_shm(shp, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002156}
2157
2158/**
2159 * smack_of_sem - the smack pointer for the sem
2160 * @sma: the object
2161 *
2162 * Returns a pointer to the smack value
2163 */
2164static char *smack_of_sem(struct sem_array *sma)
2165{
2166 return (char *)sma->sem_perm.security;
2167}
2168
2169/**
2170 * smack_sem_alloc_security - Set the security blob for sem
2171 * @sma: the object
2172 *
2173 * Returns 0
2174 */
2175static int smack_sem_alloc_security(struct sem_array *sma)
2176{
2177 struct kern_ipc_perm *isp = &sma->sem_perm;
2178
Casey Schaufler676dac42010-12-02 06:43:39 -08002179 isp->security = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002180 return 0;
2181}
2182
2183/**
2184 * smack_sem_free_security - Clear the security blob for sem
2185 * @sma: the object
2186 *
2187 * Clears the blob pointer
2188 */
2189static void smack_sem_free_security(struct sem_array *sma)
2190{
2191 struct kern_ipc_perm *isp = &sma->sem_perm;
2192
2193 isp->security = NULL;
2194}
2195
2196/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02002197 * smk_curacc_sem : check if current has access on sem
2198 * @sma : the object
2199 * @access : access requested
2200 *
2201 * Returns 0 if current has the requested access, error code otherwise
2202 */
2203static int smk_curacc_sem(struct sem_array *sma, int access)
2204{
2205 char *ssp = smack_of_sem(sma);
2206 struct smk_audit_info ad;
2207
2208#ifdef CONFIG_AUDIT
2209 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2210 ad.a.u.ipc_id = sma->sem_perm.id;
2211#endif
2212 return smk_curacc(ssp, access, &ad);
2213}
2214
2215/**
Casey Schauflere114e472008-02-04 22:29:50 -08002216 * smack_sem_associate - Smack access check for sem
2217 * @sma: the object
2218 * @semflg: access requested
2219 *
2220 * Returns 0 if current has the requested access, error code otherwise
2221 */
2222static int smack_sem_associate(struct sem_array *sma, int semflg)
2223{
Casey Schauflere114e472008-02-04 22:29:50 -08002224 int may;
2225
2226 may = smack_flags_to_may(semflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002227 return smk_curacc_sem(sma, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002228}
2229
2230/**
2231 * smack_sem_shmctl - Smack access check for sem
2232 * @sma: the object
2233 * @cmd: what it wants to do
2234 *
2235 * Returns 0 if current has the requested access, error code otherwise
2236 */
2237static int smack_sem_semctl(struct sem_array *sma, int cmd)
2238{
Casey Schauflere114e472008-02-04 22:29:50 -08002239 int may;
2240
2241 switch (cmd) {
2242 case GETPID:
2243 case GETNCNT:
2244 case GETZCNT:
2245 case GETVAL:
2246 case GETALL:
2247 case IPC_STAT:
2248 case SEM_STAT:
2249 may = MAY_READ;
2250 break;
2251 case SETVAL:
2252 case SETALL:
2253 case IPC_RMID:
2254 case IPC_SET:
2255 may = MAY_READWRITE;
2256 break;
2257 case IPC_INFO:
2258 case SEM_INFO:
2259 /*
2260 * System level information
2261 */
2262 return 0;
2263 default:
2264 return -EINVAL;
2265 }
2266
Etienne Bassetecfcc532009-04-08 20:40:06 +02002267 return smk_curacc_sem(sma, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002268}
2269
2270/**
2271 * smack_sem_semop - Smack checks of semaphore operations
2272 * @sma: the object
2273 * @sops: unused
2274 * @nsops: unused
2275 * @alter: unused
2276 *
2277 * Treated as read and write in all cases.
2278 *
2279 * Returns 0 if access is allowed, error code otherwise
2280 */
2281static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2282 unsigned nsops, int alter)
2283{
Etienne Bassetecfcc532009-04-08 20:40:06 +02002284 return smk_curacc_sem(sma, MAY_READWRITE);
Casey Schauflere114e472008-02-04 22:29:50 -08002285}
2286
2287/**
2288 * smack_msg_alloc_security - Set the security blob for msg
2289 * @msq: the object
2290 *
2291 * Returns 0
2292 */
2293static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2294{
2295 struct kern_ipc_perm *kisp = &msq->q_perm;
2296
Casey Schaufler676dac42010-12-02 06:43:39 -08002297 kisp->security = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002298 return 0;
2299}
2300
2301/**
2302 * smack_msg_free_security - Clear the security blob for msg
2303 * @msq: the object
2304 *
2305 * Clears the blob pointer
2306 */
2307static void smack_msg_queue_free_security(struct msg_queue *msq)
2308{
2309 struct kern_ipc_perm *kisp = &msq->q_perm;
2310
2311 kisp->security = NULL;
2312}
2313
2314/**
2315 * smack_of_msq - the smack pointer for the msq
2316 * @msq: the object
2317 *
2318 * Returns a pointer to the smack value
2319 */
2320static char *smack_of_msq(struct msg_queue *msq)
2321{
2322 return (char *)msq->q_perm.security;
2323}
2324
2325/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02002326 * smk_curacc_msq : helper to check if current has access on msq
2327 * @msq : the msq
2328 * @access : access requested
2329 *
2330 * return 0 if current has access, error otherwise
2331 */
2332static int smk_curacc_msq(struct msg_queue *msq, int access)
2333{
2334 char *msp = smack_of_msq(msq);
2335 struct smk_audit_info ad;
2336
2337#ifdef CONFIG_AUDIT
2338 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2339 ad.a.u.ipc_id = msq->q_perm.id;
2340#endif
2341 return smk_curacc(msp, access, &ad);
2342}
2343
2344/**
Casey Schauflere114e472008-02-04 22:29:50 -08002345 * smack_msg_queue_associate - Smack access check for msg_queue
2346 * @msq: the object
2347 * @msqflg: access requested
2348 *
2349 * Returns 0 if current has the requested access, error code otherwise
2350 */
2351static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2352{
Casey Schauflere114e472008-02-04 22:29:50 -08002353 int may;
2354
2355 may = smack_flags_to_may(msqflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002356 return smk_curacc_msq(msq, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002357}
2358
2359/**
2360 * smack_msg_queue_msgctl - Smack access check for msg_queue
2361 * @msq: the object
2362 * @cmd: what it wants to do
2363 *
2364 * Returns 0 if current has the requested access, error code otherwise
2365 */
2366static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2367{
Casey Schauflere114e472008-02-04 22:29:50 -08002368 int may;
2369
2370 switch (cmd) {
2371 case IPC_STAT:
2372 case MSG_STAT:
2373 may = MAY_READ;
2374 break;
2375 case IPC_SET:
2376 case IPC_RMID:
2377 may = MAY_READWRITE;
2378 break;
2379 case IPC_INFO:
2380 case MSG_INFO:
2381 /*
2382 * System level information
2383 */
2384 return 0;
2385 default:
2386 return -EINVAL;
2387 }
2388
Etienne Bassetecfcc532009-04-08 20:40:06 +02002389 return smk_curacc_msq(msq, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002390}
2391
2392/**
2393 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2394 * @msq: the object
2395 * @msg: unused
2396 * @msqflg: access requested
2397 *
2398 * Returns 0 if current has the requested access, error code otherwise
2399 */
2400static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2401 int msqflg)
2402{
Etienne Bassetecfcc532009-04-08 20:40:06 +02002403 int may;
Casey Schauflere114e472008-02-04 22:29:50 -08002404
Etienne Bassetecfcc532009-04-08 20:40:06 +02002405 may = smack_flags_to_may(msqflg);
2406 return smk_curacc_msq(msq, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002407}
2408
2409/**
2410 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2411 * @msq: the object
2412 * @msg: unused
2413 * @target: unused
2414 * @type: unused
2415 * @mode: unused
2416 *
2417 * Returns 0 if current has read and write access, error code otherwise
2418 */
2419static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2420 struct task_struct *target, long type, int mode)
2421{
Etienne Bassetecfcc532009-04-08 20:40:06 +02002422 return smk_curacc_msq(msq, MAY_READWRITE);
Casey Schauflere114e472008-02-04 22:29:50 -08002423}
2424
2425/**
2426 * smack_ipc_permission - Smack access for ipc_permission()
2427 * @ipp: the object permissions
2428 * @flag: access requested
2429 *
2430 * Returns 0 if current has read and write access, error code otherwise
2431 */
2432static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2433{
2434 char *isp = ipp->security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002435 int may = smack_flags_to_may(flag);
2436 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -08002437
Etienne Bassetecfcc532009-04-08 20:40:06 +02002438#ifdef CONFIG_AUDIT
2439 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2440 ad.a.u.ipc_id = ipp->id;
2441#endif
2442 return smk_curacc(isp, may, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08002443}
2444
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10002445/**
2446 * smack_ipc_getsecid - Extract smack security id
Randy Dunlap251a2a92009-02-18 11:42:33 -08002447 * @ipp: the object permissions
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10002448 * @secid: where result will be saved
2449 */
2450static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2451{
2452 char *smack = ipp->security;
2453
2454 *secid = smack_to_secid(smack);
2455}
2456
Casey Schauflere114e472008-02-04 22:29:50 -08002457/**
2458 * smack_d_instantiate - Make sure the blob is correct on an inode
Dan Carpenter3e62cbb2010-06-01 09:14:04 +02002459 * @opt_dentry: dentry where inode will be attached
Casey Schauflere114e472008-02-04 22:29:50 -08002460 * @inode: the object
2461 *
2462 * Set the inode's security blob if it hasn't been done already.
2463 */
2464static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2465{
2466 struct super_block *sbp;
2467 struct superblock_smack *sbsp;
2468 struct inode_smack *isp;
Casey Schaufler676dac42010-12-02 06:43:39 -08002469 char *csp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002470 char *fetched;
2471 char *final;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002472 char trattr[TRANS_TRUE_SIZE];
2473 int transflag = 0;
Casey Schaufler2267b132012-03-13 19:14:19 -07002474 int rc;
Casey Schauflere114e472008-02-04 22:29:50 -08002475 struct dentry *dp;
2476
2477 if (inode == NULL)
2478 return;
2479
2480 isp = inode->i_security;
2481
2482 mutex_lock(&isp->smk_lock);
2483 /*
2484 * If the inode is already instantiated
2485 * take the quick way out
2486 */
2487 if (isp->smk_flags & SMK_INODE_INSTANT)
2488 goto unlockandout;
2489
2490 sbp = inode->i_sb;
2491 sbsp = sbp->s_security;
2492 /*
2493 * We're going to use the superblock default label
2494 * if there's no label on the file.
2495 */
2496 final = sbsp->smk_default;
2497
2498 /*
Casey Schauflere97dcb02008-06-02 10:04:32 -07002499 * If this is the root inode the superblock
2500 * may be in the process of initialization.
2501 * If that is the case use the root value out
2502 * of the superblock.
2503 */
2504 if (opt_dentry->d_parent == opt_dentry) {
2505 isp->smk_inode = sbsp->smk_root;
2506 isp->smk_flags |= SMK_INODE_INSTANT;
2507 goto unlockandout;
2508 }
2509
2510 /*
Casey Schauflere114e472008-02-04 22:29:50 -08002511 * This is pretty hackish.
2512 * Casey says that we shouldn't have to do
2513 * file system specific code, but it does help
2514 * with keeping it simple.
2515 */
2516 switch (sbp->s_magic) {
2517 case SMACK_MAGIC:
2518 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002519 * Casey says that it's a little embarrassing
Casey Schauflere114e472008-02-04 22:29:50 -08002520 * that the smack file system doesn't do
2521 * extended attributes.
2522 */
2523 final = smack_known_star.smk_known;
2524 break;
2525 case PIPEFS_MAGIC:
2526 /*
2527 * Casey says pipes are easy (?)
2528 */
2529 final = smack_known_star.smk_known;
2530 break;
2531 case DEVPTS_SUPER_MAGIC:
2532 /*
2533 * devpts seems content with the label of the task.
2534 * Programs that change smack have to treat the
2535 * pty with respect.
2536 */
2537 final = csp;
2538 break;
2539 case SOCKFS_MAGIC:
2540 /*
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002541 * Socket access is controlled by the socket
2542 * structures associated with the task involved.
Casey Schauflere114e472008-02-04 22:29:50 -08002543 */
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002544 final = smack_known_star.smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08002545 break;
2546 case PROC_SUPER_MAGIC:
2547 /*
2548 * Casey says procfs appears not to care.
2549 * The superblock default suffices.
2550 */
2551 break;
2552 case TMPFS_MAGIC:
2553 /*
2554 * Device labels should come from the filesystem,
2555 * but watch out, because they're volitile,
2556 * getting recreated on every reboot.
2557 */
2558 final = smack_known_star.smk_known;
2559 /*
2560 * No break.
2561 *
2562 * If a smack value has been set we want to use it,
2563 * but since tmpfs isn't giving us the opportunity
2564 * to set mount options simulate setting the
2565 * superblock default.
2566 */
2567 default:
2568 /*
2569 * This isn't an understood special case.
2570 * Get the value from the xattr.
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002571 */
2572
2573 /*
2574 * UNIX domain sockets use lower level socket data.
2575 */
2576 if (S_ISSOCK(inode->i_mode)) {
2577 final = smack_known_star.smk_known;
2578 break;
2579 }
2580 /*
Casey Schauflere114e472008-02-04 22:29:50 -08002581 * No xattr support means, alas, no SMACK label.
2582 * Use the aforeapplied default.
2583 * It would be curious if the label of the task
2584 * does not match that assigned.
2585 */
2586 if (inode->i_op->getxattr == NULL)
2587 break;
2588 /*
2589 * Get the dentry for xattr.
2590 */
Dan Carpenter3e62cbb2010-06-01 09:14:04 +02002591 dp = dget(opt_dentry);
Casey Schaufler676dac42010-12-02 06:43:39 -08002592 fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp);
Casey Schaufler2267b132012-03-13 19:14:19 -07002593 if (fetched != NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08002594 final = fetched;
Casey Schaufler2267b132012-03-13 19:14:19 -07002595
2596 /*
2597 * Transmuting directory
2598 */
2599 if (S_ISDIR(inode->i_mode)) {
2600 /*
2601 * If this is a new directory and the label was
2602 * transmuted when the inode was initialized
2603 * set the transmute attribute on the directory
2604 * and mark the inode.
2605 *
2606 * If there is a transmute attribute on the
2607 * directory mark the inode.
2608 */
2609 if (isp->smk_flags & SMK_INODE_CHANGED) {
2610 isp->smk_flags &= ~SMK_INODE_CHANGED;
2611 rc = inode->i_op->setxattr(dp,
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002612 XATTR_NAME_SMACKTRANSMUTE,
Casey Schaufler2267b132012-03-13 19:14:19 -07002613 TRANS_TRUE, TRANS_TRUE_SIZE,
2614 0);
2615 } else {
2616 rc = inode->i_op->getxattr(dp,
2617 XATTR_NAME_SMACKTRANSMUTE, trattr,
2618 TRANS_TRUE_SIZE);
2619 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
2620 TRANS_TRUE_SIZE) != 0)
2621 rc = -EINVAL;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002622 }
Casey Schaufler2267b132012-03-13 19:14:19 -07002623 if (rc >= 0)
2624 transflag = SMK_INODE_TRANSMUTE;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002625 }
2626 isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002627 isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
Casey Schaufler676dac42010-12-02 06:43:39 -08002628
Casey Schauflere114e472008-02-04 22:29:50 -08002629 dput(dp);
2630 break;
2631 }
2632
2633 if (final == NULL)
2634 isp->smk_inode = csp;
2635 else
2636 isp->smk_inode = final;
2637
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002638 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
Casey Schauflere114e472008-02-04 22:29:50 -08002639
2640unlockandout:
2641 mutex_unlock(&isp->smk_lock);
2642 return;
2643}
2644
2645/**
2646 * smack_getprocattr - Smack process attribute access
2647 * @p: the object task
2648 * @name: the name of the attribute in /proc/.../attr
2649 * @value: where to put the result
2650 *
2651 * Places a copy of the task Smack into value
2652 *
2653 * Returns the length of the smack label or an error code
2654 */
2655static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2656{
2657 char *cp;
2658 int slen;
2659
2660 if (strcmp(name, "current") != 0)
2661 return -EINVAL;
2662
Casey Schaufler676dac42010-12-02 06:43:39 -08002663 cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL);
Casey Schauflere114e472008-02-04 22:29:50 -08002664 if (cp == NULL)
2665 return -ENOMEM;
2666
2667 slen = strlen(cp);
2668 *value = cp;
2669 return slen;
2670}
2671
2672/**
2673 * smack_setprocattr - Smack process attribute setting
2674 * @p: the object task
2675 * @name: the name of the attribute in /proc/.../attr
2676 * @value: the value to set
2677 * @size: the size of the value
2678 *
2679 * Sets the Smack value of the task. Only setting self
2680 * is permitted and only with privilege
2681 *
2682 * Returns the length of the smack label or an error code
2683 */
2684static int smack_setprocattr(struct task_struct *p, char *name,
2685 void *value, size_t size)
2686{
Casey Schaufler676dac42010-12-02 06:43:39 -08002687 struct task_smack *tsp;
David Howellsd84f4f92008-11-14 10:39:23 +11002688 struct cred *new;
Casey Schauflere114e472008-02-04 22:29:50 -08002689 char *newsmack;
2690
Casey Schauflere114e472008-02-04 22:29:50 -08002691 /*
2692 * Changing another process' Smack value is too dangerous
2693 * and supports no sane use case.
2694 */
2695 if (p != current)
2696 return -EPERM;
2697
Casey Schaufler1880eff2012-06-05 15:28:30 -07002698 if (!smack_privileged(CAP_MAC_ADMIN))
David Howells5cd9c582008-08-14 11:37:28 +01002699 return -EPERM;
2700
Casey Schauflerf7112e62012-05-06 15:22:02 -07002701 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
Casey Schauflere114e472008-02-04 22:29:50 -08002702 return -EINVAL;
2703
2704 if (strcmp(name, "current") != 0)
2705 return -EINVAL;
2706
2707 newsmack = smk_import(value, size);
2708 if (newsmack == NULL)
2709 return -EINVAL;
2710
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002711 /*
2712 * No process is ever allowed the web ("@") label.
2713 */
2714 if (newsmack == smack_known_web.smk_known)
2715 return -EPERM;
2716
David Howellsd84f4f92008-11-14 10:39:23 +11002717 new = prepare_creds();
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002718 if (new == NULL)
David Howellsd84f4f92008-11-14 10:39:23 +11002719 return -ENOMEM;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002720
Casey Schaufler46a2f3b2012-08-22 11:44:03 -07002721 tsp = new->security;
2722 tsp->smk_task = newsmack;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002723
David Howellsd84f4f92008-11-14 10:39:23 +11002724 commit_creds(new);
Casey Schauflere114e472008-02-04 22:29:50 -08002725 return size;
2726}
2727
2728/**
2729 * smack_unix_stream_connect - Smack access on UDS
David S. Miller3610cda2011-01-05 15:38:53 -08002730 * @sock: one sock
2731 * @other: the other sock
Casey Schauflere114e472008-02-04 22:29:50 -08002732 * @newsk: unused
2733 *
2734 * Return 0 if a subject with the smack of sock could access
2735 * an object with the smack of other, otherwise an error code
2736 */
David S. Miller3610cda2011-01-05 15:38:53 -08002737static int smack_unix_stream_connect(struct sock *sock,
2738 struct sock *other, struct sock *newsk)
Casey Schauflere114e472008-02-04 22:29:50 -08002739{
James Morrisd2e7ad12011-01-10 09:46:24 +11002740 struct socket_smack *ssp = sock->sk_security;
2741 struct socket_smack *osp = other->sk_security;
Casey Schaufler975d5e52011-09-26 14:43:39 -07002742 struct socket_smack *nsp = newsk->sk_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002743 struct smk_audit_info ad;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002744 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08002745
Kees Cook923e9a12012-04-10 13:26:44 -07002746#ifdef CONFIG_AUDIT
2747 struct lsm_network_audit net;
2748
Eric Paris48c62af2012-04-02 13:15:44 -04002749 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
David S. Miller3610cda2011-01-05 15:38:53 -08002750 smk_ad_setfield_u_net_sk(&ad, other);
Kees Cook923e9a12012-04-10 13:26:44 -07002751#endif
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002752
Casey Schaufler1880eff2012-06-05 15:28:30 -07002753 if (!smack_privileged(CAP_MAC_OVERRIDE))
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002754 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2755
Casey Schaufler975d5e52011-09-26 14:43:39 -07002756 /*
2757 * Cross reference the peer labels for SO_PEERSEC.
2758 */
2759 if (rc == 0) {
2760 nsp->smk_packet = ssp->smk_out;
2761 ssp->smk_packet = osp->smk_out;
2762 }
2763
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002764 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08002765}
2766
2767/**
2768 * smack_unix_may_send - Smack access on UDS
2769 * @sock: one socket
2770 * @other: the other socket
2771 *
2772 * Return 0 if a subject with the smack of sock could access
2773 * an object with the smack of other, otherwise an error code
2774 */
2775static int smack_unix_may_send(struct socket *sock, struct socket *other)
2776{
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002777 struct socket_smack *ssp = sock->sk->sk_security;
2778 struct socket_smack *osp = other->sk->sk_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002779 struct smk_audit_info ad;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002780 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08002781
Kees Cook923e9a12012-04-10 13:26:44 -07002782#ifdef CONFIG_AUDIT
2783 struct lsm_network_audit net;
2784
Eric Paris48c62af2012-04-02 13:15:44 -04002785 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002786 smk_ad_setfield_u_net_sk(&ad, other->sk);
Kees Cook923e9a12012-04-10 13:26:44 -07002787#endif
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002788
Casey Schaufler1880eff2012-06-05 15:28:30 -07002789 if (!smack_privileged(CAP_MAC_OVERRIDE))
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002790 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2791
2792 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08002793}
2794
2795/**
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002796 * smack_socket_sendmsg - Smack check based on destination host
2797 * @sock: the socket
Randy Dunlap251a2a92009-02-18 11:42:33 -08002798 * @msg: the message
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002799 * @size: the size of the message
2800 *
2801 * Return 0 if the current subject can write to the destination
2802 * host. This is only a question if the destination is a single
2803 * label host.
2804 */
2805static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
2806 int size)
2807{
2808 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002809
2810 /*
2811 * Perfectly reasonable for this to be NULL
2812 */
Julia Lawallda34d422009-08-05 14:34:55 +02002813 if (sip == NULL || sip->sin_family != AF_INET)
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002814 return 0;
2815
Paul Moore07feee82009-03-27 17:10:54 -04002816 return smack_netlabel_send(sock->sk, sip);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002817}
2818
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002819/**
Randy Dunlap251a2a92009-02-18 11:42:33 -08002820 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
Casey Schauflere114e472008-02-04 22:29:50 -08002821 * @sap: netlabel secattr
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002822 * @ssp: socket security information
Casey Schauflere114e472008-02-04 22:29:50 -08002823 *
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002824 * Returns a pointer to a Smack label found on the label list.
Casey Schauflere114e472008-02-04 22:29:50 -08002825 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002826static char *smack_from_secattr(struct netlbl_lsm_secattr *sap,
2827 struct socket_smack *ssp)
Casey Schauflere114e472008-02-04 22:29:50 -08002828{
Casey Schauflerf7112e62012-05-06 15:22:02 -07002829 struct smack_known *kp;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002830 char *sp;
Casey Schauflerf7112e62012-05-06 15:22:02 -07002831 int found = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08002832
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002833 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
Casey Schauflere114e472008-02-04 22:29:50 -08002834 /*
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002835 * Looks like a CIPSO packet.
Casey Schauflere114e472008-02-04 22:29:50 -08002836 * If there are flags but no level netlabel isn't
2837 * behaving the way we expect it to.
2838 *
Casey Schauflerf7112e62012-05-06 15:22:02 -07002839 * Look it up in the label table
Casey Schauflere114e472008-02-04 22:29:50 -08002840 * Without guidance regarding the smack value
2841 * for the packet fall back on the network
2842 * ambient value.
2843 */
Casey Schauflerf7112e62012-05-06 15:22:02 -07002844 rcu_read_lock();
2845 list_for_each_entry(kp, &smack_known_list, list) {
2846 if (sap->attr.mls.lvl != kp->smk_netlabel.attr.mls.lvl)
2847 continue;
2848 if (memcmp(sap->attr.mls.cat,
2849 kp->smk_netlabel.attr.mls.cat,
2850 SMK_CIPSOLEN) != 0)
2851 continue;
2852 found = 1;
2853 break;
Casey Schauflere114e472008-02-04 22:29:50 -08002854 }
Casey Schauflerf7112e62012-05-06 15:22:02 -07002855 rcu_read_unlock();
2856
2857 if (found)
2858 return kp->smk_known;
2859
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002860 if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known)
2861 return smack_known_web.smk_known;
2862 return smack_known_star.smk_known;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002863 }
2864 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
2865 /*
2866 * Looks like a fallback, which gives us a secid.
2867 */
2868 sp = smack_from_secid(sap->attr.secid);
2869 /*
2870 * This has got to be a bug because it is
2871 * impossible to specify a fallback without
2872 * specifying the label, which will ensure
2873 * it has a secid, and the only way to get a
2874 * secid is from a fallback.
2875 */
2876 BUG_ON(sp == NULL);
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002877 return sp;
Casey Schauflere114e472008-02-04 22:29:50 -08002878 }
2879 /*
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002880 * Without guidance regarding the smack value
2881 * for the packet fall back on the network
2882 * ambient value.
Casey Schauflere114e472008-02-04 22:29:50 -08002883 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002884 return smack_net_ambient;
Casey Schauflere114e472008-02-04 22:29:50 -08002885}
2886
2887/**
2888 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2889 * @sk: socket
2890 * @skb: packet
2891 *
2892 * Returns 0 if the packet should be delivered, an error code otherwise
2893 */
2894static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
2895{
2896 struct netlbl_lsm_secattr secattr;
2897 struct socket_smack *ssp = sk->sk_security;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002898 char *csp;
Casey Schauflere114e472008-02-04 22:29:50 -08002899 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002900 struct smk_audit_info ad;
Kees Cook923e9a12012-04-10 13:26:44 -07002901#ifdef CONFIG_AUDIT
Eric Paris48c62af2012-04-02 13:15:44 -04002902 struct lsm_network_audit net;
Kees Cook923e9a12012-04-10 13:26:44 -07002903#endif
Casey Schauflere114e472008-02-04 22:29:50 -08002904 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2905 return 0;
2906
2907 /*
2908 * Translate what netlabel gave us.
2909 */
Casey Schauflere114e472008-02-04 22:29:50 -08002910 netlbl_secattr_init(&secattr);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002911
Casey Schauflere114e472008-02-04 22:29:50 -08002912 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002913 if (rc == 0)
2914 csp = smack_from_secattr(&secattr, ssp);
2915 else
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002916 csp = smack_net_ambient;
2917
Casey Schauflere114e472008-02-04 22:29:50 -08002918 netlbl_secattr_destroy(&secattr);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002919
Etienne Bassetecfcc532009-04-08 20:40:06 +02002920#ifdef CONFIG_AUDIT
Eric Paris48c62af2012-04-02 13:15:44 -04002921 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2922 ad.a.u.net->family = sk->sk_family;
2923 ad.a.u.net->netif = skb->skb_iif;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002924 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
2925#endif
Casey Schauflere114e472008-02-04 22:29:50 -08002926 /*
2927 * Receiving a packet requires that the other end
2928 * be able to write here. Read access is not required.
2929 * This is the simplist possible security model
2930 * for networking.
2931 */
Etienne Bassetecfcc532009-04-08 20:40:06 +02002932 rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad);
Paul Moorea8134292008-10-10 10:16:31 -04002933 if (rc != 0)
2934 netlbl_skbuff_err(skb, rc, 0);
2935 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08002936}
2937
2938/**
2939 * smack_socket_getpeersec_stream - pull in packet label
2940 * @sock: the socket
2941 * @optval: user's destination
2942 * @optlen: size thereof
Randy Dunlap251a2a92009-02-18 11:42:33 -08002943 * @len: max thereof
Casey Schauflere114e472008-02-04 22:29:50 -08002944 *
2945 * returns zero on success, an error code otherwise
2946 */
2947static int smack_socket_getpeersec_stream(struct socket *sock,
2948 char __user *optval,
2949 int __user *optlen, unsigned len)
2950{
2951 struct socket_smack *ssp;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002952 char *rcp = "";
2953 int slen = 1;
Casey Schauflere114e472008-02-04 22:29:50 -08002954 int rc = 0;
2955
2956 ssp = sock->sk->sk_security;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002957 if (ssp->smk_packet != NULL) {
2958 rcp = ssp->smk_packet;
2959 slen = strlen(rcp) + 1;
2960 }
Casey Schauflere114e472008-02-04 22:29:50 -08002961
2962 if (slen > len)
2963 rc = -ERANGE;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002964 else if (copy_to_user(optval, rcp, slen) != 0)
Casey Schauflere114e472008-02-04 22:29:50 -08002965 rc = -EFAULT;
2966
2967 if (put_user(slen, optlen) != 0)
2968 rc = -EFAULT;
2969
2970 return rc;
2971}
2972
2973
2974/**
2975 * smack_socket_getpeersec_dgram - pull in packet label
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002976 * @sock: the peer socket
Casey Schauflere114e472008-02-04 22:29:50 -08002977 * @skb: packet data
2978 * @secid: pointer to where to put the secid of the packet
2979 *
2980 * Sets the netlabel socket state on sk from parent
2981 */
2982static int smack_socket_getpeersec_dgram(struct socket *sock,
2983 struct sk_buff *skb, u32 *secid)
2984
2985{
2986 struct netlbl_lsm_secattr secattr;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002987 struct socket_smack *ssp = NULL;
2988 char *sp;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002989 int family = PF_UNSPEC;
2990 u32 s = 0; /* 0 is the invalid secid */
Casey Schauflere114e472008-02-04 22:29:50 -08002991 int rc;
2992
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002993 if (skb != NULL) {
2994 if (skb->protocol == htons(ETH_P_IP))
2995 family = PF_INET;
2996 else if (skb->protocol == htons(ETH_P_IPV6))
2997 family = PF_INET6;
Casey Schauflere114e472008-02-04 22:29:50 -08002998 }
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002999 if (family == PF_UNSPEC && sock != NULL)
3000 family = sock->sk->sk_family;
Casey Schauflere114e472008-02-04 22:29:50 -08003001
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003002 if (family == PF_UNIX) {
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003003 ssp = sock->sk->sk_security;
3004 s = smack_to_secid(ssp->smk_out);
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003005 } else if (family == PF_INET || family == PF_INET6) {
3006 /*
3007 * Translate what netlabel gave us.
3008 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003009 if (sock != NULL && sock->sk != NULL)
3010 ssp = sock->sk->sk_security;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003011 netlbl_secattr_init(&secattr);
3012 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3013 if (rc == 0) {
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003014 sp = smack_from_secattr(&secattr, ssp);
3015 s = smack_to_secid(sp);
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003016 }
3017 netlbl_secattr_destroy(&secattr);
3018 }
3019 *secid = s;
Casey Schauflere114e472008-02-04 22:29:50 -08003020 if (s == 0)
3021 return -EINVAL;
Casey Schauflere114e472008-02-04 22:29:50 -08003022 return 0;
3023}
3024
3025/**
Paul Moore07feee82009-03-27 17:10:54 -04003026 * smack_sock_graft - Initialize a newly created socket with an existing sock
3027 * @sk: child sock
3028 * @parent: parent socket
Casey Schauflere114e472008-02-04 22:29:50 -08003029 *
Paul Moore07feee82009-03-27 17:10:54 -04003030 * Set the smk_{in,out} state of an existing sock based on the process that
3031 * is creating the new socket.
Casey Schauflere114e472008-02-04 22:29:50 -08003032 */
3033static void smack_sock_graft(struct sock *sk, struct socket *parent)
3034{
3035 struct socket_smack *ssp;
Casey Schauflere114e472008-02-04 22:29:50 -08003036
Paul Moore07feee82009-03-27 17:10:54 -04003037 if (sk == NULL ||
3038 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
Casey Schauflere114e472008-02-04 22:29:50 -08003039 return;
3040
3041 ssp = sk->sk_security;
Casey Schaufler676dac42010-12-02 06:43:39 -08003042 ssp->smk_in = ssp->smk_out = smk_of_current();
Paul Moore07feee82009-03-27 17:10:54 -04003043 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
Casey Schauflere114e472008-02-04 22:29:50 -08003044}
3045
3046/**
3047 * smack_inet_conn_request - Smack access check on connect
3048 * @sk: socket involved
3049 * @skb: packet
3050 * @req: unused
3051 *
3052 * Returns 0 if a task with the packet label could write to
3053 * the socket, otherwise an error code
3054 */
3055static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3056 struct request_sock *req)
3057{
Paul Moore07feee82009-03-27 17:10:54 -04003058 u16 family = sk->sk_family;
Casey Schauflerf7112e62012-05-06 15:22:02 -07003059 struct smack_known *skp;
Casey Schauflere114e472008-02-04 22:29:50 -08003060 struct socket_smack *ssp = sk->sk_security;
Paul Moore07feee82009-03-27 17:10:54 -04003061 struct netlbl_lsm_secattr secattr;
3062 struct sockaddr_in addr;
3063 struct iphdr *hdr;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003064 char *sp;
Casey Schauflerf7112e62012-05-06 15:22:02 -07003065 char *hsp;
Casey Schauflere114e472008-02-04 22:29:50 -08003066 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003067 struct smk_audit_info ad;
Kees Cook923e9a12012-04-10 13:26:44 -07003068#ifdef CONFIG_AUDIT
Eric Paris48c62af2012-04-02 13:15:44 -04003069 struct lsm_network_audit net;
Kees Cook923e9a12012-04-10 13:26:44 -07003070#endif
Casey Schauflere114e472008-02-04 22:29:50 -08003071
Paul Moore07feee82009-03-27 17:10:54 -04003072 /* handle mapped IPv4 packets arriving via IPv6 sockets */
3073 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
3074 family = PF_INET;
Casey Schauflere114e472008-02-04 22:29:50 -08003075
Paul Moore07feee82009-03-27 17:10:54 -04003076 netlbl_secattr_init(&secattr);
3077 rc = netlbl_skbuff_getattr(skb, family, &secattr);
Casey Schauflere114e472008-02-04 22:29:50 -08003078 if (rc == 0)
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003079 sp = smack_from_secattr(&secattr, ssp);
Casey Schauflere114e472008-02-04 22:29:50 -08003080 else
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003081 sp = smack_known_huh.smk_known;
Paul Moore07feee82009-03-27 17:10:54 -04003082 netlbl_secattr_destroy(&secattr);
3083
Etienne Bassetecfcc532009-04-08 20:40:06 +02003084#ifdef CONFIG_AUDIT
Eric Paris48c62af2012-04-02 13:15:44 -04003085 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3086 ad.a.u.net->family = family;
3087 ad.a.u.net->netif = skb->skb_iif;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003088 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3089#endif
Casey Schauflere114e472008-02-04 22:29:50 -08003090 /*
Paul Moore07feee82009-03-27 17:10:54 -04003091 * Receiving a packet requires that the other end be able to write
3092 * here. Read access is not required.
Casey Schauflere114e472008-02-04 22:29:50 -08003093 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003094 rc = smk_access(sp, ssp->smk_in, MAY_WRITE, &ad);
Paul Moore07feee82009-03-27 17:10:54 -04003095 if (rc != 0)
3096 return rc;
3097
3098 /*
3099 * Save the peer's label in the request_sock so we can later setup
3100 * smk_packet in the child socket so that SO_PEERCRED can report it.
3101 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003102 req->peer_secid = smack_to_secid(sp);
Paul Moore07feee82009-03-27 17:10:54 -04003103
3104 /*
3105 * We need to decide if we want to label the incoming connection here
3106 * if we do we only need to label the request_sock and the stack will
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003107 * propagate the wire-label to the sock when it is created.
Paul Moore07feee82009-03-27 17:10:54 -04003108 */
3109 hdr = ip_hdr(skb);
3110 addr.sin_addr.s_addr = hdr->saddr;
3111 rcu_read_lock();
Casey Schauflerf7112e62012-05-06 15:22:02 -07003112 hsp = smack_host_label(&addr);
3113 rcu_read_unlock();
3114
3115 if (hsp == NULL) {
3116 skp = smk_find_entry(sp);
3117 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
3118 } else
Paul Moore07feee82009-03-27 17:10:54 -04003119 netlbl_req_delattr(req);
Casey Schauflere114e472008-02-04 22:29:50 -08003120
3121 return rc;
3122}
3123
Paul Moore07feee82009-03-27 17:10:54 -04003124/**
3125 * smack_inet_csk_clone - Copy the connection information to the new socket
3126 * @sk: the new socket
3127 * @req: the connection's request_sock
3128 *
3129 * Transfer the connection's peer label to the newly created socket.
3130 */
3131static void smack_inet_csk_clone(struct sock *sk,
3132 const struct request_sock *req)
3133{
3134 struct socket_smack *ssp = sk->sk_security;
Paul Moore07feee82009-03-27 17:10:54 -04003135
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003136 if (req->peer_secid != 0)
3137 ssp->smk_packet = smack_from_secid(req->peer_secid);
3138 else
3139 ssp->smk_packet = NULL;
Paul Moore07feee82009-03-27 17:10:54 -04003140}
3141
Casey Schauflere114e472008-02-04 22:29:50 -08003142/*
3143 * Key management security hooks
3144 *
3145 * Casey has not tested key support very heavily.
3146 * The permission check is most likely too restrictive.
3147 * If you care about keys please have a look.
3148 */
3149#ifdef CONFIG_KEYS
3150
3151/**
3152 * smack_key_alloc - Set the key security blob
3153 * @key: object
David Howellsd84f4f92008-11-14 10:39:23 +11003154 * @cred: the credentials to use
Casey Schauflere114e472008-02-04 22:29:50 -08003155 * @flags: unused
3156 *
3157 * No allocation required
3158 *
3159 * Returns 0
3160 */
David Howellsd84f4f92008-11-14 10:39:23 +11003161static int smack_key_alloc(struct key *key, const struct cred *cred,
Casey Schauflere114e472008-02-04 22:29:50 -08003162 unsigned long flags)
3163{
Casey Schaufler676dac42010-12-02 06:43:39 -08003164 key->security = smk_of_task(cred->security);
Casey Schauflere114e472008-02-04 22:29:50 -08003165 return 0;
3166}
3167
3168/**
3169 * smack_key_free - Clear the key security blob
3170 * @key: the object
3171 *
3172 * Clear the blob pointer
3173 */
3174static void smack_key_free(struct key *key)
3175{
3176 key->security = NULL;
3177}
3178
3179/*
3180 * smack_key_permission - Smack access on a key
3181 * @key_ref: gets to the object
David Howellsd84f4f92008-11-14 10:39:23 +11003182 * @cred: the credentials to use
Casey Schauflere114e472008-02-04 22:29:50 -08003183 * @perm: unused
3184 *
3185 * Return 0 if the task has read and write to the object,
3186 * an error code otherwise
3187 */
3188static int smack_key_permission(key_ref_t key_ref,
David Howellsd84f4f92008-11-14 10:39:23 +11003189 const struct cred *cred, key_perm_t perm)
Casey Schauflere114e472008-02-04 22:29:50 -08003190{
3191 struct key *keyp;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003192 struct smk_audit_info ad;
Casey Schaufler676dac42010-12-02 06:43:39 -08003193 char *tsp = smk_of_task(cred->security);
Casey Schauflere114e472008-02-04 22:29:50 -08003194
3195 keyp = key_ref_to_ptr(key_ref);
3196 if (keyp == NULL)
3197 return -EINVAL;
3198 /*
3199 * If the key hasn't been initialized give it access so that
3200 * it may do so.
3201 */
3202 if (keyp->security == NULL)
3203 return 0;
3204 /*
3205 * This should not occur
3206 */
Casey Schaufler676dac42010-12-02 06:43:39 -08003207 if (tsp == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08003208 return -EACCES;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003209#ifdef CONFIG_AUDIT
3210 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3211 ad.a.u.key_struct.key = keyp->serial;
3212 ad.a.u.key_struct.key_desc = keyp->description;
3213#endif
Casey Schaufler676dac42010-12-02 06:43:39 -08003214 return smk_access(tsp, keyp->security,
Etienne Bassetecfcc532009-04-08 20:40:06 +02003215 MAY_READWRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08003216}
3217#endif /* CONFIG_KEYS */
3218
3219/*
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003220 * Smack Audit hooks
3221 *
3222 * Audit requires a unique representation of each Smack specific
3223 * rule. This unique representation is used to distinguish the
3224 * object to be audited from remaining kernel objects and also
3225 * works as a glue between the audit hooks.
3226 *
3227 * Since repository entries are added but never deleted, we'll use
3228 * the smack_known label address related to the given audit rule as
3229 * the needed unique representation. This also better fits the smack
3230 * model where nearly everything is a label.
3231 */
3232#ifdef CONFIG_AUDIT
3233
3234/**
3235 * smack_audit_rule_init - Initialize a smack audit rule
3236 * @field: audit rule fields given from user-space (audit.h)
3237 * @op: required testing operator (=, !=, >, <, ...)
3238 * @rulestr: smack label to be audited
3239 * @vrule: pointer to save our own audit rule representation
3240 *
3241 * Prepare to audit cases where (@field @op @rulestr) is true.
3242 * The label to be audited is created if necessay.
3243 */
3244static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3245{
3246 char **rule = (char **)vrule;
3247 *rule = NULL;
3248
3249 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3250 return -EINVAL;
3251
Al Viro5af75d82008-12-16 05:59:26 -05003252 if (op != Audit_equal && op != Audit_not_equal)
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003253 return -EINVAL;
3254
3255 *rule = smk_import(rulestr, 0);
3256
3257 return 0;
3258}
3259
3260/**
3261 * smack_audit_rule_known - Distinguish Smack audit rules
3262 * @krule: rule of interest, in Audit kernel representation format
3263 *
3264 * This is used to filter Smack rules from remaining Audit ones.
3265 * If it's proved that this rule belongs to us, the
3266 * audit_rule_match hook will be called to do the final judgement.
3267 */
3268static int smack_audit_rule_known(struct audit_krule *krule)
3269{
3270 struct audit_field *f;
3271 int i;
3272
3273 for (i = 0; i < krule->field_count; i++) {
3274 f = &krule->fields[i];
3275
3276 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3277 return 1;
3278 }
3279
3280 return 0;
3281}
3282
3283/**
3284 * smack_audit_rule_match - Audit given object ?
3285 * @secid: security id for identifying the object to test
3286 * @field: audit rule flags given from user-space
3287 * @op: required testing operator
3288 * @vrule: smack internal rule presentation
3289 * @actx: audit context associated with the check
3290 *
3291 * The core Audit hook. It's used to take the decision of
3292 * whether to audit or not to audit a given object.
3293 */
3294static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3295 struct audit_context *actx)
3296{
3297 char *smack;
3298 char *rule = vrule;
3299
3300 if (!rule) {
Tetsuo Handaceffec552012-03-29 16:19:05 +09003301 audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003302 "Smack: missing rule\n");
3303 return -ENOENT;
3304 }
3305
3306 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3307 return 0;
3308
3309 smack = smack_from_secid(secid);
3310
3311 /*
3312 * No need to do string comparisons. If a match occurs,
3313 * both pointers will point to the same smack_known
3314 * label.
3315 */
Al Viro5af75d82008-12-16 05:59:26 -05003316 if (op == Audit_equal)
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003317 return (rule == smack);
Al Viro5af75d82008-12-16 05:59:26 -05003318 if (op == Audit_not_equal)
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003319 return (rule != smack);
3320
3321 return 0;
3322}
3323
3324/**
3325 * smack_audit_rule_free - free smack rule representation
3326 * @vrule: rule to be freed.
3327 *
3328 * No memory was allocated.
3329 */
3330static void smack_audit_rule_free(void *vrule)
3331{
3332 /* No-op */
3333}
3334
3335#endif /* CONFIG_AUDIT */
3336
Randy Dunlap251a2a92009-02-18 11:42:33 -08003337/**
Casey Schauflere114e472008-02-04 22:29:50 -08003338 * smack_secid_to_secctx - return the smack label for a secid
3339 * @secid: incoming integer
3340 * @secdata: destination
3341 * @seclen: how long it is
3342 *
3343 * Exists for networking code.
3344 */
3345static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3346{
3347 char *sp = smack_from_secid(secid);
3348
Eric Parisd5630b92010-10-13 16:24:48 -04003349 if (secdata)
3350 *secdata = sp;
Casey Schauflere114e472008-02-04 22:29:50 -08003351 *seclen = strlen(sp);
3352 return 0;
3353}
3354
Randy Dunlap251a2a92009-02-18 11:42:33 -08003355/**
Casey Schaufler4bc87e62008-02-15 15:24:25 -08003356 * smack_secctx_to_secid - return the secid for a smack label
3357 * @secdata: smack label
3358 * @seclen: how long result is
3359 * @secid: outgoing integer
3360 *
3361 * Exists for audit and networking code.
3362 */
David Howellse52c17642008-04-29 20:52:51 +01003363static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
Casey Schaufler4bc87e62008-02-15 15:24:25 -08003364{
3365 *secid = smack_to_secid(secdata);
3366 return 0;
3367}
3368
Randy Dunlap251a2a92009-02-18 11:42:33 -08003369/**
Casey Schauflere114e472008-02-04 22:29:50 -08003370 * smack_release_secctx - don't do anything.
Randy Dunlap251a2a92009-02-18 11:42:33 -08003371 * @secdata: unused
3372 * @seclen: unused
Casey Schauflere114e472008-02-04 22:29:50 -08003373 *
3374 * Exists to make sure nothing gets done, and properly
3375 */
3376static void smack_release_secctx(char *secdata, u32 seclen)
3377{
3378}
3379
David P. Quigley1ee65e32009-09-03 14:25:57 -04003380static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3381{
3382 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3383}
3384
3385static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3386{
3387 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3388}
3389
3390static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3391{
3392 int len = 0;
3393 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3394
3395 if (len < 0)
3396 return len;
3397 *ctxlen = len;
3398 return 0;
3399}
3400
Ahmed S. Darwish076c54c2008-03-06 18:09:10 +02003401struct security_operations smack_ops = {
3402 .name = "smack",
3403
Ingo Molnar9e488582009-05-07 19:26:19 +10003404 .ptrace_access_check = smack_ptrace_access_check,
David Howells5cd9c582008-08-14 11:37:28 +01003405 .ptrace_traceme = smack_ptrace_traceme,
Casey Schauflere114e472008-02-04 22:29:50 -08003406 .syslog = smack_syslog,
Casey Schauflere114e472008-02-04 22:29:50 -08003407
3408 .sb_alloc_security = smack_sb_alloc_security,
3409 .sb_free_security = smack_sb_free_security,
3410 .sb_copy_data = smack_sb_copy_data,
3411 .sb_kern_mount = smack_sb_kern_mount,
3412 .sb_statfs = smack_sb_statfs,
3413 .sb_mount = smack_sb_mount,
3414 .sb_umount = smack_sb_umount,
3415
Casey Schaufler676dac42010-12-02 06:43:39 -08003416 .bprm_set_creds = smack_bprm_set_creds,
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +03003417 .bprm_committing_creds = smack_bprm_committing_creds,
3418 .bprm_secureexec = smack_bprm_secureexec,
Casey Schaufler676dac42010-12-02 06:43:39 -08003419
Casey Schauflere114e472008-02-04 22:29:50 -08003420 .inode_alloc_security = smack_inode_alloc_security,
3421 .inode_free_security = smack_inode_free_security,
3422 .inode_init_security = smack_inode_init_security,
3423 .inode_link = smack_inode_link,
3424 .inode_unlink = smack_inode_unlink,
3425 .inode_rmdir = smack_inode_rmdir,
3426 .inode_rename = smack_inode_rename,
3427 .inode_permission = smack_inode_permission,
3428 .inode_setattr = smack_inode_setattr,
3429 .inode_getattr = smack_inode_getattr,
3430 .inode_setxattr = smack_inode_setxattr,
3431 .inode_post_setxattr = smack_inode_post_setxattr,
3432 .inode_getxattr = smack_inode_getxattr,
3433 .inode_removexattr = smack_inode_removexattr,
3434 .inode_getsecurity = smack_inode_getsecurity,
3435 .inode_setsecurity = smack_inode_setsecurity,
3436 .inode_listsecurity = smack_inode_listsecurity,
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003437 .inode_getsecid = smack_inode_getsecid,
Casey Schauflere114e472008-02-04 22:29:50 -08003438
3439 .file_permission = smack_file_permission,
3440 .file_alloc_security = smack_file_alloc_security,
3441 .file_free_security = smack_file_free_security,
3442 .file_ioctl = smack_file_ioctl,
3443 .file_lock = smack_file_lock,
3444 .file_fcntl = smack_file_fcntl,
Al Viroe5467852012-05-30 13:30:51 -04003445 .mmap_file = smack_mmap_file,
3446 .mmap_addr = cap_mmap_addr,
Casey Schauflere114e472008-02-04 22:29:50 -08003447 .file_set_fowner = smack_file_set_fowner,
3448 .file_send_sigiotask = smack_file_send_sigiotask,
3449 .file_receive = smack_file_receive,
3450
Eric Paris83d49852012-04-04 13:45:40 -04003451 .file_open = smack_file_open,
Casey Schaufler531f1d42011-09-19 12:41:42 -07003452
David Howellsee18d642009-09-02 09:14:21 +01003453 .cred_alloc_blank = smack_cred_alloc_blank,
David Howellsf1752ee2008-11-14 10:39:17 +11003454 .cred_free = smack_cred_free,
David Howellsd84f4f92008-11-14 10:39:23 +11003455 .cred_prepare = smack_cred_prepare,
David Howellsee18d642009-09-02 09:14:21 +01003456 .cred_transfer = smack_cred_transfer,
David Howells3a3b7ce2008-11-14 10:39:28 +11003457 .kernel_act_as = smack_kernel_act_as,
3458 .kernel_create_files_as = smack_kernel_create_files_as,
Casey Schauflere114e472008-02-04 22:29:50 -08003459 .task_setpgid = smack_task_setpgid,
3460 .task_getpgid = smack_task_getpgid,
3461 .task_getsid = smack_task_getsid,
3462 .task_getsecid = smack_task_getsecid,
3463 .task_setnice = smack_task_setnice,
3464 .task_setioprio = smack_task_setioprio,
3465 .task_getioprio = smack_task_getioprio,
3466 .task_setscheduler = smack_task_setscheduler,
3467 .task_getscheduler = smack_task_getscheduler,
3468 .task_movememory = smack_task_movememory,
3469 .task_kill = smack_task_kill,
3470 .task_wait = smack_task_wait,
Casey Schauflere114e472008-02-04 22:29:50 -08003471 .task_to_inode = smack_task_to_inode,
3472
3473 .ipc_permission = smack_ipc_permission,
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003474 .ipc_getsecid = smack_ipc_getsecid,
Casey Schauflere114e472008-02-04 22:29:50 -08003475
3476 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
3477 .msg_msg_free_security = smack_msg_msg_free_security,
3478
3479 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
3480 .msg_queue_free_security = smack_msg_queue_free_security,
3481 .msg_queue_associate = smack_msg_queue_associate,
3482 .msg_queue_msgctl = smack_msg_queue_msgctl,
3483 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
3484 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
3485
3486 .shm_alloc_security = smack_shm_alloc_security,
3487 .shm_free_security = smack_shm_free_security,
3488 .shm_associate = smack_shm_associate,
3489 .shm_shmctl = smack_shm_shmctl,
3490 .shm_shmat = smack_shm_shmat,
3491
3492 .sem_alloc_security = smack_sem_alloc_security,
3493 .sem_free_security = smack_sem_free_security,
3494 .sem_associate = smack_sem_associate,
3495 .sem_semctl = smack_sem_semctl,
3496 .sem_semop = smack_sem_semop,
3497
Casey Schauflere114e472008-02-04 22:29:50 -08003498 .d_instantiate = smack_d_instantiate,
3499
3500 .getprocattr = smack_getprocattr,
3501 .setprocattr = smack_setprocattr,
3502
3503 .unix_stream_connect = smack_unix_stream_connect,
3504 .unix_may_send = smack_unix_may_send,
3505
3506 .socket_post_create = smack_socket_post_create,
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003507 .socket_connect = smack_socket_connect,
3508 .socket_sendmsg = smack_socket_sendmsg,
Casey Schauflere114e472008-02-04 22:29:50 -08003509 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
3510 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
3511 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
3512 .sk_alloc_security = smack_sk_alloc_security,
3513 .sk_free_security = smack_sk_free_security,
3514 .sock_graft = smack_sock_graft,
3515 .inet_conn_request = smack_inet_conn_request,
Paul Moore07feee82009-03-27 17:10:54 -04003516 .inet_csk_clone = smack_inet_csk_clone,
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003517
Casey Schauflere114e472008-02-04 22:29:50 -08003518 /* key management security hooks */
3519#ifdef CONFIG_KEYS
3520 .key_alloc = smack_key_alloc,
3521 .key_free = smack_key_free,
3522 .key_permission = smack_key_permission,
3523#endif /* CONFIG_KEYS */
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003524
3525 /* Audit hooks */
3526#ifdef CONFIG_AUDIT
3527 .audit_rule_init = smack_audit_rule_init,
3528 .audit_rule_known = smack_audit_rule_known,
3529 .audit_rule_match = smack_audit_rule_match,
3530 .audit_rule_free = smack_audit_rule_free,
3531#endif /* CONFIG_AUDIT */
3532
Casey Schauflere114e472008-02-04 22:29:50 -08003533 .secid_to_secctx = smack_secid_to_secctx,
Casey Schaufler4bc87e62008-02-15 15:24:25 -08003534 .secctx_to_secid = smack_secctx_to_secid,
Casey Schauflere114e472008-02-04 22:29:50 -08003535 .release_secctx = smack_release_secctx,
David P. Quigley1ee65e32009-09-03 14:25:57 -04003536 .inode_notifysecctx = smack_inode_notifysecctx,
3537 .inode_setsecctx = smack_inode_setsecctx,
3538 .inode_getsecctx = smack_inode_getsecctx,
Casey Schauflere114e472008-02-04 22:29:50 -08003539};
3540
Etienne Basset7198e2e2009-03-24 20:53:24 +01003541
Casey Schaufler86812bb2012-04-17 18:55:46 -07003542static __init void init_smack_known_list(void)
Etienne Basset7198e2e2009-03-24 20:53:24 +01003543{
Casey Schaufler86812bb2012-04-17 18:55:46 -07003544 /*
Casey Schaufler86812bb2012-04-17 18:55:46 -07003545 * Initialize rule list locks
3546 */
3547 mutex_init(&smack_known_huh.smk_rules_lock);
3548 mutex_init(&smack_known_hat.smk_rules_lock);
3549 mutex_init(&smack_known_floor.smk_rules_lock);
3550 mutex_init(&smack_known_star.smk_rules_lock);
3551 mutex_init(&smack_known_invalid.smk_rules_lock);
3552 mutex_init(&smack_known_web.smk_rules_lock);
3553 /*
3554 * Initialize rule lists
3555 */
3556 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
3557 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
3558 INIT_LIST_HEAD(&smack_known_star.smk_rules);
3559 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
3560 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
3561 INIT_LIST_HEAD(&smack_known_web.smk_rules);
3562 /*
3563 * Create the known labels list
3564 */
Etienne Basset7198e2e2009-03-24 20:53:24 +01003565 list_add(&smack_known_huh.list, &smack_known_list);
3566 list_add(&smack_known_hat.list, &smack_known_list);
3567 list_add(&smack_known_star.list, &smack_known_list);
3568 list_add(&smack_known_floor.list, &smack_known_list);
3569 list_add(&smack_known_invalid.list, &smack_known_list);
3570 list_add(&smack_known_web.list, &smack_known_list);
3571}
3572
Casey Schauflere114e472008-02-04 22:29:50 -08003573/**
3574 * smack_init - initialize the smack system
3575 *
3576 * Returns 0
3577 */
3578static __init int smack_init(void)
3579{
David Howellsd84f4f92008-11-14 10:39:23 +11003580 struct cred *cred;
Casey Schaufler676dac42010-12-02 06:43:39 -08003581 struct task_smack *tsp;
David Howellsd84f4f92008-11-14 10:39:23 +11003582
Casey Schaufler7898e1f2011-01-17 08:05:27 -08003583 if (!security_module_enable(&smack_ops))
3584 return 0;
3585
3586 tsp = new_task_smack(smack_known_floor.smk_known,
3587 smack_known_floor.smk_known, GFP_KERNEL);
Casey Schaufler676dac42010-12-02 06:43:39 -08003588 if (tsp == NULL)
3589 return -ENOMEM;
3590
Casey Schauflere114e472008-02-04 22:29:50 -08003591 printk(KERN_INFO "Smack: Initializing.\n");
3592
3593 /*
3594 * Set the security state for the initial task.
3595 */
David Howellsd84f4f92008-11-14 10:39:23 +11003596 cred = (struct cred *) current->cred;
Casey Schaufler676dac42010-12-02 06:43:39 -08003597 cred->security = tsp;
Casey Schauflere114e472008-02-04 22:29:50 -08003598
Casey Schaufler86812bb2012-04-17 18:55:46 -07003599 /* initialize the smack_known_list */
3600 init_smack_known_list();
Casey Schauflere114e472008-02-04 22:29:50 -08003601
3602 /*
3603 * Register with LSM
3604 */
3605 if (register_security(&smack_ops))
3606 panic("smack: Unable to register with kernel.\n");
3607
3608 return 0;
3609}
3610
3611/*
3612 * Smack requires early initialization in order to label
3613 * all processes and objects when they are created.
3614 */
3615security_initcall(smack_init);