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Casey Schauflere114e472008-02-04 22:29:50 -08001/*
2 * Simplified MAC Kernel (smack) security module
3 *
4 * This file contains the smack hook function implementations.
5 *
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02006 * Authors:
Casey Schauflere114e472008-02-04 22:29:50 -08007 * Casey Schaufler <casey@schaufler-ca.com>
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +03008 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Casey Schauflere114e472008-02-04 22:29:50 -08009 *
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
Paul Moore07feee82009-03-27 17:10:54 -040011 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
Paul Moore82c21bf2011-08-01 11:10:33 +000012 * Paul Moore <paul@paul-moore.com>
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +020013 * Copyright (C) 2010 Nokia Corporation
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +030014 * Copyright (C) 2011 Intel Corporation.
Casey Schauflere114e472008-02-04 22:29:50 -080015 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
19 */
20
21#include <linux/xattr.h>
22#include <linux/pagemap.h>
23#include <linux/mount.h>
24#include <linux/stat.h>
Casey Schauflere114e472008-02-04 22:29:50 -080025#include <linux/kd.h>
26#include <asm/ioctls.h>
Paul Moore07feee82009-03-27 17:10:54 -040027#include <linux/ip.h>
Casey Schauflere114e472008-02-04 22:29:50 -080028#include <linux/tcp.h>
29#include <linux/udp.h>
Casey Schauflerc6739442013-05-22 18:42:56 -070030#include <linux/dccp.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Casey Schauflere114e472008-02-04 22:29:50 -080032#include <linux/mutex.h>
33#include <linux/pipe_fs_i.h>
Casey Schauflere114e472008-02-04 22:29:50 -080034#include <net/cipso_ipv4.h>
Casey Schauflerc6739442013-05-22 18:42:56 -070035#include <net/ip.h>
36#include <net/ipv6.h>
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +100037#include <linux/audit.h>
Nick Black1fd7317d2009-09-22 16:43:33 -070038#include <linux/magic.h>
Eric Paris2a7dba32011-02-01 11:05:39 -050039#include <linux/dcache.h>
Jarkko Sakkinen16014d82011-10-14 13:16:24 +030040#include <linux/personality.h>
Al Viro40401532012-02-13 03:58:52 +000041#include <linux/msg.h>
42#include <linux/shm.h>
43#include <linux/binfmts.h>
Casey Schauflere114e472008-02-04 22:29:50 -080044#include "smack.h"
45
David Howellsc69e8d92008-11-14 10:39:19 +110046#define task_security(task) (task_cred_xxx((task), security))
47
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +020048#define TRANS_TRUE "TRUE"
49#define TRANS_TRUE_SIZE 4
50
Casey Schauflerc6739442013-05-22 18:42:56 -070051#define SMK_CONNECTING 0
52#define SMK_RECEIVING 1
53#define SMK_SENDING 2
54
55LIST_HEAD(smk_ipv6_port_list);
56
Casey Schauflere114e472008-02-04 22:29:50 -080057/**
58 * smk_fetch - Fetch the smack label from a file.
59 * @ip: a pointer to the inode
60 * @dp: a pointer to the dentry
61 *
62 * Returns a pointer to the master list entry for the Smack label
63 * or NULL if there was no label to fetch.
64 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -070065static struct smack_known *smk_fetch(const char *name, struct inode *ip,
66 struct dentry *dp)
Casey Schauflere114e472008-02-04 22:29:50 -080067{
68 int rc;
Casey Schauflerf7112e62012-05-06 15:22:02 -070069 char *buffer;
Casey Schaufler2f823ff2013-05-22 18:43:03 -070070 struct smack_known *skp = NULL;
Casey Schauflere114e472008-02-04 22:29:50 -080071
72 if (ip->i_op->getxattr == NULL)
73 return NULL;
74
Casey Schauflerf7112e62012-05-06 15:22:02 -070075 buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
76 if (buffer == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -080077 return NULL;
78
Casey Schauflerf7112e62012-05-06 15:22:02 -070079 rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
80 if (rc > 0)
Casey Schaufler2f823ff2013-05-22 18:43:03 -070081 skp = smk_import_entry(buffer, rc);
Casey Schauflerf7112e62012-05-06 15:22:02 -070082
83 kfree(buffer);
84
Casey Schaufler2f823ff2013-05-22 18:43:03 -070085 return skp;
Casey Schauflere114e472008-02-04 22:29:50 -080086}
87
88/**
89 * new_inode_smack - allocate an inode security blob
90 * @smack: a pointer to the Smack label to use in the blob
91 *
92 * Returns the new blob or NULL if there's no memory available
93 */
94struct inode_smack *new_inode_smack(char *smack)
95{
96 struct inode_smack *isp;
97
Tetsuo Handaceffec552012-03-29 16:19:05 +090098 isp = kzalloc(sizeof(struct inode_smack), GFP_NOFS);
Casey Schauflere114e472008-02-04 22:29:50 -080099 if (isp == NULL)
100 return NULL;
101
102 isp->smk_inode = smack;
103 isp->smk_flags = 0;
104 mutex_init(&isp->smk_lock);
105
106 return isp;
107}
108
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800109/**
110 * new_task_smack - allocate a task security blob
111 * @smack: a pointer to the Smack label to use in the blob
112 *
113 * Returns the new blob or NULL if there's no memory available
114 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700115static struct task_smack *new_task_smack(struct smack_known *task,
116 struct smack_known *forked, gfp_t gfp)
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800117{
118 struct task_smack *tsp;
119
120 tsp = kzalloc(sizeof(struct task_smack), gfp);
121 if (tsp == NULL)
122 return NULL;
123
124 tsp->smk_task = task;
125 tsp->smk_forked = forked;
126 INIT_LIST_HEAD(&tsp->smk_rules);
127 mutex_init(&tsp->smk_rules_lock);
128
129 return tsp;
130}
131
132/**
133 * smk_copy_rules - copy a rule set
134 * @nhead - new rules header pointer
135 * @ohead - old rules header pointer
136 *
137 * Returns 0 on success, -ENOMEM on error
138 */
139static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
140 gfp_t gfp)
141{
142 struct smack_rule *nrp;
143 struct smack_rule *orp;
144 int rc = 0;
145
146 INIT_LIST_HEAD(nhead);
147
148 list_for_each_entry_rcu(orp, ohead, list) {
149 nrp = kzalloc(sizeof(struct smack_rule), gfp);
150 if (nrp == NULL) {
151 rc = -ENOMEM;
152 break;
153 }
154 *nrp = *orp;
155 list_add_rcu(&nrp->list, nhead);
156 }
157 return rc;
158}
159
Casey Schauflere114e472008-02-04 22:29:50 -0800160/*
161 * LSM hooks.
162 * We he, that is fun!
163 */
164
165/**
Ingo Molnar9e488582009-05-07 19:26:19 +1000166 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
Casey Schauflere114e472008-02-04 22:29:50 -0800167 * @ctp: child task pointer
Randy Dunlap251a2a92009-02-18 11:42:33 -0800168 * @mode: ptrace attachment mode
Casey Schauflere114e472008-02-04 22:29:50 -0800169 *
170 * Returns 0 if access is OK, an error code otherwise
171 *
172 * Do the capability checks, and require read and write.
173 */
Ingo Molnar9e488582009-05-07 19:26:19 +1000174static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
Casey Schauflere114e472008-02-04 22:29:50 -0800175{
176 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200177 struct smk_audit_info ad;
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700178 struct smack_known *skp;
Casey Schauflere114e472008-02-04 22:29:50 -0800179
Ingo Molnar9e488582009-05-07 19:26:19 +1000180 rc = cap_ptrace_access_check(ctp, mode);
Casey Schauflere114e472008-02-04 22:29:50 -0800181 if (rc != 0)
182 return rc;
183
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700184 skp = smk_of_task(task_security(ctp));
Etienne Bassetecfcc532009-04-08 20:40:06 +0200185 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
186 smk_ad_setfield_u_tsk(&ad, ctp);
187
Casey Schauflerb5dfd802013-10-22 11:47:45 -0700188 rc = smk_curacc(skp->smk_known, mode, &ad);
David Howells5cd9c582008-08-14 11:37:28 +0100189 return rc;
190}
Casey Schauflere114e472008-02-04 22:29:50 -0800191
David Howells5cd9c582008-08-14 11:37:28 +0100192/**
193 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
194 * @ptp: parent task pointer
195 *
196 * Returns 0 if access is OK, an error code otherwise
197 *
198 * Do the capability checks, and require read and write.
199 */
200static int smack_ptrace_traceme(struct task_struct *ptp)
201{
202 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200203 struct smk_audit_info ad;
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700204 struct smack_known *skp;
David Howells5cd9c582008-08-14 11:37:28 +0100205
206 rc = cap_ptrace_traceme(ptp);
207 if (rc != 0)
208 return rc;
209
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700210 skp = smk_of_task(task_security(ptp));
Etienne Bassetecfcc532009-04-08 20:40:06 +0200211 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
212 smk_ad_setfield_u_tsk(&ad, ptp);
213
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700214 rc = smk_curacc(skp->smk_known, MAY_READWRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800215 return rc;
216}
217
218/**
219 * smack_syslog - Smack approval on syslog
220 * @type: message type
221 *
Casey Schauflere114e472008-02-04 22:29:50 -0800222 * Returns 0 on success, error code otherwise.
223 */
Eric Paris12b30522010-11-15 18:36:29 -0500224static int smack_syslog(int typefrom_file)
Casey Schauflere114e472008-02-04 22:29:50 -0800225{
Eric Paris12b30522010-11-15 18:36:29 -0500226 int rc = 0;
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700227 struct smack_known *skp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -0800228
Casey Schaufler1880eff2012-06-05 15:28:30 -0700229 if (smack_privileged(CAP_MAC_OVERRIDE))
Casey Schauflere114e472008-02-04 22:29:50 -0800230 return 0;
231
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800232 if (smack_syslog_label != NULL && smack_syslog_label != skp)
Casey Schauflere114e472008-02-04 22:29:50 -0800233 rc = -EACCES;
234
235 return rc;
236}
237
238
239/*
240 * Superblock Hooks.
241 */
242
243/**
244 * smack_sb_alloc_security - allocate a superblock blob
245 * @sb: the superblock getting the blob
246 *
247 * Returns 0 on success or -ENOMEM on error.
248 */
249static int smack_sb_alloc_security(struct super_block *sb)
250{
251 struct superblock_smack *sbsp;
252
253 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
254
255 if (sbsp == NULL)
256 return -ENOMEM;
257
258 sbsp->smk_root = smack_known_floor.smk_known;
259 sbsp->smk_default = smack_known_floor.smk_known;
260 sbsp->smk_floor = smack_known_floor.smk_known;
261 sbsp->smk_hat = smack_known_hat.smk_known;
Casey Schauflere830b392013-05-22 18:43:07 -0700262 /*
263 * smk_initialized will be zero from kzalloc.
264 */
Casey Schauflere114e472008-02-04 22:29:50 -0800265 sb->s_security = sbsp;
266
267 return 0;
268}
269
270/**
271 * smack_sb_free_security - free a superblock blob
272 * @sb: the superblock getting the blob
273 *
274 */
275static void smack_sb_free_security(struct super_block *sb)
276{
277 kfree(sb->s_security);
278 sb->s_security = NULL;
279}
280
281/**
282 * smack_sb_copy_data - copy mount options data for processing
Casey Schauflere114e472008-02-04 22:29:50 -0800283 * @orig: where to start
Randy Dunlap251a2a92009-02-18 11:42:33 -0800284 * @smackopts: mount options string
Casey Schauflere114e472008-02-04 22:29:50 -0800285 *
286 * Returns 0 on success or -ENOMEM on error.
287 *
288 * Copy the Smack specific mount options out of the mount
289 * options list.
290 */
Eric Parise0007522008-03-05 10:31:54 -0500291static int smack_sb_copy_data(char *orig, char *smackopts)
Casey Schauflere114e472008-02-04 22:29:50 -0800292{
293 char *cp, *commap, *otheropts, *dp;
294
Casey Schauflere114e472008-02-04 22:29:50 -0800295 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
296 if (otheropts == NULL)
297 return -ENOMEM;
298
299 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
300 if (strstr(cp, SMK_FSDEFAULT) == cp)
301 dp = smackopts;
302 else if (strstr(cp, SMK_FSFLOOR) == cp)
303 dp = smackopts;
304 else if (strstr(cp, SMK_FSHAT) == cp)
305 dp = smackopts;
306 else if (strstr(cp, SMK_FSROOT) == cp)
307 dp = smackopts;
Casey Schauflere830b392013-05-22 18:43:07 -0700308 else if (strstr(cp, SMK_FSTRANS) == cp)
309 dp = smackopts;
Casey Schauflere114e472008-02-04 22:29:50 -0800310 else
311 dp = otheropts;
312
313 commap = strchr(cp, ',');
314 if (commap != NULL)
315 *commap = '\0';
316
317 if (*dp != '\0')
318 strcat(dp, ",");
319 strcat(dp, cp);
320 }
321
322 strcpy(orig, otheropts);
323 free_page((unsigned long)otheropts);
324
325 return 0;
326}
327
328/**
329 * smack_sb_kern_mount - Smack specific mount processing
330 * @sb: the file system superblock
James Morris12204e22008-12-19 10:44:42 +1100331 * @flags: the mount flags
Casey Schauflere114e472008-02-04 22:29:50 -0800332 * @data: the smack mount options
333 *
334 * Returns 0 on success, an error code on failure
335 */
James Morris12204e22008-12-19 10:44:42 +1100336static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
Casey Schauflere114e472008-02-04 22:29:50 -0800337{
338 struct dentry *root = sb->s_root;
339 struct inode *inode = root->d_inode;
340 struct superblock_smack *sp = sb->s_security;
341 struct inode_smack *isp;
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800342 struct smack_known *skp;
Casey Schauflere114e472008-02-04 22:29:50 -0800343 char *op;
344 char *commap;
345 char *nsp;
Casey Schauflere830b392013-05-22 18:43:07 -0700346 int transmute = 0;
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800347 int specified = 0;
Casey Schauflere114e472008-02-04 22:29:50 -0800348
Casey Schauflere830b392013-05-22 18:43:07 -0700349 if (sp->smk_initialized)
Casey Schauflere114e472008-02-04 22:29:50 -0800350 return 0;
Casey Schauflereb982cb2012-05-23 17:46:58 -0700351
Casey Schauflere114e472008-02-04 22:29:50 -0800352 sp->smk_initialized = 1;
Casey Schauflere114e472008-02-04 22:29:50 -0800353
354 for (op = data; op != NULL; op = commap) {
355 commap = strchr(op, ',');
356 if (commap != NULL)
357 *commap++ = '\0';
358
359 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
360 op += strlen(SMK_FSHAT);
361 nsp = smk_import(op, 0);
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800362 if (nsp != NULL) {
Casey Schauflere114e472008-02-04 22:29:50 -0800363 sp->smk_hat = nsp;
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800364 specified = 1;
365 }
Casey Schauflere114e472008-02-04 22:29:50 -0800366 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
367 op += strlen(SMK_FSFLOOR);
368 nsp = smk_import(op, 0);
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800369 if (nsp != NULL) {
Casey Schauflere114e472008-02-04 22:29:50 -0800370 sp->smk_floor = nsp;
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800371 specified = 1;
372 }
Casey Schauflere114e472008-02-04 22:29:50 -0800373 } else if (strncmp(op, SMK_FSDEFAULT,
374 strlen(SMK_FSDEFAULT)) == 0) {
375 op += strlen(SMK_FSDEFAULT);
376 nsp = smk_import(op, 0);
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800377 if (nsp != NULL) {
Casey Schauflere114e472008-02-04 22:29:50 -0800378 sp->smk_default = nsp;
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800379 specified = 1;
380 }
Casey Schauflere114e472008-02-04 22:29:50 -0800381 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
382 op += strlen(SMK_FSROOT);
383 nsp = smk_import(op, 0);
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800384 if (nsp != NULL) {
Casey Schauflere114e472008-02-04 22:29:50 -0800385 sp->smk_root = nsp;
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800386 specified = 1;
387 }
Casey Schauflere830b392013-05-22 18:43:07 -0700388 } else if (strncmp(op, SMK_FSTRANS, strlen(SMK_FSTRANS)) == 0) {
389 op += strlen(SMK_FSTRANS);
390 nsp = smk_import(op, 0);
391 if (nsp != NULL) {
392 sp->smk_root = nsp;
393 transmute = 1;
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800394 specified = 1;
Casey Schauflere830b392013-05-22 18:43:07 -0700395 }
Casey Schauflere114e472008-02-04 22:29:50 -0800396 }
397 }
398
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800399 if (!smack_privileged(CAP_MAC_ADMIN)) {
400 /*
401 * Unprivileged mounts don't get to specify Smack values.
402 */
403 if (specified)
404 return -EPERM;
405 /*
406 * Unprivileged mounts get root and default from the caller.
407 */
408 skp = smk_of_current();
409 sp->smk_root = skp->smk_known;
410 sp->smk_default = skp->smk_known;
411 }
Casey Schauflere114e472008-02-04 22:29:50 -0800412 /*
413 * Initialize the root inode.
414 */
415 isp = inode->i_security;
Casey Schauflere830b392013-05-22 18:43:07 -0700416 if (inode->i_security == NULL) {
Casey Schauflere114e472008-02-04 22:29:50 -0800417 inode->i_security = new_inode_smack(sp->smk_root);
Casey Schauflere830b392013-05-22 18:43:07 -0700418 isp = inode->i_security;
419 } else
Casey Schauflere114e472008-02-04 22:29:50 -0800420 isp->smk_inode = sp->smk_root;
421
Casey Schauflere830b392013-05-22 18:43:07 -0700422 if (transmute)
423 isp->smk_flags |= SMK_INODE_TRANSMUTE;
424
Casey Schauflere114e472008-02-04 22:29:50 -0800425 return 0;
426}
427
428/**
429 * smack_sb_statfs - Smack check on statfs
430 * @dentry: identifies the file system in question
431 *
432 * Returns 0 if current can read the floor of the filesystem,
433 * and error code otherwise
434 */
435static int smack_sb_statfs(struct dentry *dentry)
436{
437 struct superblock_smack *sbp = dentry->d_sb->s_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200438 int rc;
439 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800440
Eric Parisa2694342011-04-25 13:10:27 -0400441 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200442 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
443
444 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
445 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -0800446}
447
Casey Schauflere114e472008-02-04 22:29:50 -0800448/*
Casey Schaufler676dac42010-12-02 06:43:39 -0800449 * BPRM hooks
450 */
451
Casey Schauflerce8a4322011-09-29 18:21:01 -0700452/**
453 * smack_bprm_set_creds - set creds for exec
454 * @bprm: the exec information
455 *
456 * Returns 0 if it gets a blob, -ENOMEM otherwise
457 */
Casey Schaufler676dac42010-12-02 06:43:39 -0800458static int smack_bprm_set_creds(struct linux_binprm *bprm)
459{
Al Viro496ad9a2013-01-23 17:07:38 -0500460 struct inode *inode = file_inode(bprm->file);
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300461 struct task_smack *bsp = bprm->cred->security;
Casey Schaufler676dac42010-12-02 06:43:39 -0800462 struct inode_smack *isp;
Casey Schaufler676dac42010-12-02 06:43:39 -0800463 int rc;
464
465 rc = cap_bprm_set_creds(bprm);
466 if (rc != 0)
467 return rc;
468
469 if (bprm->cred_prepared)
470 return 0;
471
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300472 isp = inode->i_security;
473 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
Casey Schaufler676dac42010-12-02 06:43:39 -0800474 return 0;
475
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300476 if (bprm->unsafe)
477 return -EPERM;
Casey Schaufler676dac42010-12-02 06:43:39 -0800478
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300479 bsp->smk_task = isp->smk_task;
480 bprm->per_clear |= PER_CLEAR_ON_SETID;
Casey Schaufler676dac42010-12-02 06:43:39 -0800481
482 return 0;
483}
484
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300485/**
486 * smack_bprm_committing_creds - Prepare to install the new credentials
487 * from bprm.
488 *
489 * @bprm: binprm for exec
490 */
491static void smack_bprm_committing_creds(struct linux_binprm *bprm)
492{
493 struct task_smack *bsp = bprm->cred->security;
494
495 if (bsp->smk_task != bsp->smk_forked)
496 current->pdeath_signal = 0;
497}
498
499/**
500 * smack_bprm_secureexec - Return the decision to use secureexec.
501 * @bprm: binprm for exec
502 *
503 * Returns 0 on success.
504 */
505static int smack_bprm_secureexec(struct linux_binprm *bprm)
506{
507 struct task_smack *tsp = current_security();
508 int ret = cap_bprm_secureexec(bprm);
509
510 if (!ret && (tsp->smk_task != tsp->smk_forked))
511 ret = 1;
512
513 return ret;
514}
515
Casey Schaufler676dac42010-12-02 06:43:39 -0800516/*
Casey Schauflere114e472008-02-04 22:29:50 -0800517 * Inode hooks
518 */
519
520/**
521 * smack_inode_alloc_security - allocate an inode blob
Randy Dunlap251a2a92009-02-18 11:42:33 -0800522 * @inode: the inode in need of a blob
Casey Schauflere114e472008-02-04 22:29:50 -0800523 *
524 * Returns 0 if it gets a blob, -ENOMEM otherwise
525 */
526static int smack_inode_alloc_security(struct inode *inode)
527{
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700528 struct smack_known *skp = smk_of_current();
529
530 inode->i_security = new_inode_smack(skp->smk_known);
Casey Schauflere114e472008-02-04 22:29:50 -0800531 if (inode->i_security == NULL)
532 return -ENOMEM;
533 return 0;
534}
535
536/**
537 * smack_inode_free_security - free an inode blob
Randy Dunlap251a2a92009-02-18 11:42:33 -0800538 * @inode: the inode with a blob
Casey Schauflere114e472008-02-04 22:29:50 -0800539 *
540 * Clears the blob pointer in inode
541 */
542static void smack_inode_free_security(struct inode *inode)
543{
544 kfree(inode->i_security);
545 inode->i_security = NULL;
546}
547
548/**
549 * smack_inode_init_security - copy out the smack from an inode
550 * @inode: the inode
551 * @dir: unused
Eric Paris2a7dba32011-02-01 11:05:39 -0500552 * @qstr: unused
Casey Schauflere114e472008-02-04 22:29:50 -0800553 * @name: where to put the attribute name
554 * @value: where to put the attribute value
555 * @len: where to put the length of the attribute
556 *
557 * Returns 0 if it all works out, -ENOMEM if there's no memory
558 */
559static int smack_inode_init_security(struct inode *inode, struct inode *dir,
Tetsuo Handa95489062013-07-25 05:44:02 +0900560 const struct qstr *qstr, const char **name,
Eric Paris2a7dba32011-02-01 11:05:39 -0500561 void **value, size_t *len)
Casey Schauflere114e472008-02-04 22:29:50 -0800562{
Casey Schaufler2267b132012-03-13 19:14:19 -0700563 struct inode_smack *issp = inode->i_security;
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700564 struct smack_known *skp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -0800565 char *isp = smk_of_inode(inode);
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200566 char *dsp = smk_of_inode(dir);
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800567 int may;
Casey Schauflere114e472008-02-04 22:29:50 -0800568
Tetsuo Handa95489062013-07-25 05:44:02 +0900569 if (name)
570 *name = XATTR_SMACK_SUFFIX;
Casey Schauflere114e472008-02-04 22:29:50 -0800571
572 if (value) {
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800573 rcu_read_lock();
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700574 may = smk_access_entry(skp->smk_known, dsp, &skp->smk_rules);
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800575 rcu_read_unlock();
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200576
577 /*
578 * If the access rule allows transmutation and
579 * the directory requests transmutation then
580 * by all means transmute.
Casey Schaufler2267b132012-03-13 19:14:19 -0700581 * Mark the inode as changed.
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200582 */
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800583 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
Casey Schaufler2267b132012-03-13 19:14:19 -0700584 smk_inode_transmutable(dir)) {
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200585 isp = dsp;
Casey Schaufler2267b132012-03-13 19:14:19 -0700586 issp->smk_flags |= SMK_INODE_CHANGED;
587 }
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200588
Tetsuo Handaceffec552012-03-29 16:19:05 +0900589 *value = kstrdup(isp, GFP_NOFS);
Casey Schauflere114e472008-02-04 22:29:50 -0800590 if (*value == NULL)
591 return -ENOMEM;
592 }
593
594 if (len)
595 *len = strlen(isp) + 1;
596
597 return 0;
598}
599
600/**
601 * smack_inode_link - Smack check on link
602 * @old_dentry: the existing object
603 * @dir: unused
604 * @new_dentry: the new object
605 *
606 * Returns 0 if access is permitted, an error code otherwise
607 */
608static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
609 struct dentry *new_dentry)
610{
Casey Schauflere114e472008-02-04 22:29:50 -0800611 char *isp;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200612 struct smk_audit_info ad;
613 int rc;
614
Eric Parisa2694342011-04-25 13:10:27 -0400615 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200616 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
Casey Schauflere114e472008-02-04 22:29:50 -0800617
618 isp = smk_of_inode(old_dentry->d_inode);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200619 rc = smk_curacc(isp, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800620
621 if (rc == 0 && new_dentry->d_inode != NULL) {
622 isp = smk_of_inode(new_dentry->d_inode);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200623 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
624 rc = smk_curacc(isp, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800625 }
626
627 return rc;
628}
629
630/**
631 * smack_inode_unlink - Smack check on inode deletion
632 * @dir: containing directory object
633 * @dentry: file to unlink
634 *
635 * Returns 0 if current can write the containing directory
636 * and the object, error code otherwise
637 */
638static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
639{
640 struct inode *ip = dentry->d_inode;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200641 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800642 int rc;
643
Eric Parisa2694342011-04-25 13:10:27 -0400644 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200645 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
646
Casey Schauflere114e472008-02-04 22:29:50 -0800647 /*
648 * You need write access to the thing you're unlinking
649 */
Etienne Bassetecfcc532009-04-08 20:40:06 +0200650 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
651 if (rc == 0) {
Casey Schauflere114e472008-02-04 22:29:50 -0800652 /*
653 * You also need write access to the containing directory
654 */
Igor Zhbanovcdb56b62013-03-19 13:49:47 +0400655 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200656 smk_ad_setfield_u_fs_inode(&ad, dir);
657 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
658 }
Casey Schauflere114e472008-02-04 22:29:50 -0800659 return rc;
660}
661
662/**
663 * smack_inode_rmdir - Smack check on directory deletion
664 * @dir: containing directory object
665 * @dentry: directory to unlink
666 *
667 * Returns 0 if current can write the containing directory
668 * and the directory, error code otherwise
669 */
670static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
671{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200672 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800673 int rc;
674
Eric Parisa2694342011-04-25 13:10:27 -0400675 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200676 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
677
Casey Schauflere114e472008-02-04 22:29:50 -0800678 /*
679 * You need write access to the thing you're removing
680 */
Etienne Bassetecfcc532009-04-08 20:40:06 +0200681 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
682 if (rc == 0) {
Casey Schauflere114e472008-02-04 22:29:50 -0800683 /*
684 * You also need write access to the containing directory
685 */
Igor Zhbanovcdb56b62013-03-19 13:49:47 +0400686 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200687 smk_ad_setfield_u_fs_inode(&ad, dir);
688 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
689 }
Casey Schauflere114e472008-02-04 22:29:50 -0800690
691 return rc;
692}
693
694/**
695 * smack_inode_rename - Smack check on rename
696 * @old_inode: the old directory
697 * @old_dentry: unused
698 * @new_inode: the new directory
699 * @new_dentry: unused
700 *
701 * Read and write access is required on both the old and
702 * new directories.
703 *
704 * Returns 0 if access is permitted, an error code otherwise
705 */
706static int smack_inode_rename(struct inode *old_inode,
707 struct dentry *old_dentry,
708 struct inode *new_inode,
709 struct dentry *new_dentry)
710{
711 int rc;
712 char *isp;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200713 struct smk_audit_info ad;
714
Eric Parisa2694342011-04-25 13:10:27 -0400715 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200716 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
Casey Schauflere114e472008-02-04 22:29:50 -0800717
718 isp = smk_of_inode(old_dentry->d_inode);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200719 rc = smk_curacc(isp, MAY_READWRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800720
721 if (rc == 0 && new_dentry->d_inode != NULL) {
722 isp = smk_of_inode(new_dentry->d_inode);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200723 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
724 rc = smk_curacc(isp, MAY_READWRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800725 }
Casey Schauflere114e472008-02-04 22:29:50 -0800726 return rc;
727}
728
729/**
730 * smack_inode_permission - Smack version of permission()
731 * @inode: the inode in question
732 * @mask: the access requested
Casey Schauflere114e472008-02-04 22:29:50 -0800733 *
734 * This is the important Smack hook.
735 *
736 * Returns 0 if access is permitted, -EACCES otherwise
737 */
Al Viroe74f71e2011-06-20 19:38:15 -0400738static int smack_inode_permission(struct inode *inode, int mask)
Casey Schauflere114e472008-02-04 22:29:50 -0800739{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200740 struct smk_audit_info ad;
Al Viroe74f71e2011-06-20 19:38:15 -0400741 int no_block = mask & MAY_NOT_BLOCK;
Eric Parisd09ca732010-07-23 11:43:57 -0400742
743 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
Casey Schauflere114e472008-02-04 22:29:50 -0800744 /*
745 * No permission to check. Existence test. Yup, it's there.
746 */
747 if (mask == 0)
748 return 0;
Andi Kleen8c9e80e2011-04-21 17:23:19 -0700749
750 /* May be droppable after audit */
Al Viroe74f71e2011-06-20 19:38:15 -0400751 if (no_block)
Andi Kleen8c9e80e2011-04-21 17:23:19 -0700752 return -ECHILD;
Eric Parisf48b7392011-04-25 12:54:27 -0400753 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200754 smk_ad_setfield_u_fs_inode(&ad, inode);
755 return smk_curacc(smk_of_inode(inode), mask, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800756}
757
758/**
759 * smack_inode_setattr - Smack check for setting attributes
760 * @dentry: the object
761 * @iattr: for the force flag
762 *
763 * Returns 0 if access is permitted, an error code otherwise
764 */
765static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
766{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200767 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800768 /*
769 * Need to allow for clearing the setuid bit.
770 */
771 if (iattr->ia_valid & ATTR_FORCE)
772 return 0;
Eric Parisa2694342011-04-25 13:10:27 -0400773 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200774 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
Casey Schauflere114e472008-02-04 22:29:50 -0800775
Etienne Bassetecfcc532009-04-08 20:40:06 +0200776 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800777}
778
779/**
780 * smack_inode_getattr - Smack check for getting attributes
781 * @mnt: unused
782 * @dentry: the object
783 *
784 * Returns 0 if access is permitted, an error code otherwise
785 */
786static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
787{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200788 struct smk_audit_info ad;
Eric Parisa2694342011-04-25 13:10:27 -0400789 struct path path;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200790
Eric Parisa2694342011-04-25 13:10:27 -0400791 path.dentry = dentry;
792 path.mnt = mnt;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200793
Eric Parisf48b7392011-04-25 12:54:27 -0400794 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
Eric Parisa2694342011-04-25 13:10:27 -0400795 smk_ad_setfield_u_fs_path(&ad, path);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200796 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800797}
798
799/**
800 * smack_inode_setxattr - Smack check for setting xattrs
801 * @dentry: the object
802 * @name: name of the attribute
803 * @value: unused
804 * @size: unused
805 * @flags: unused
806 *
807 * This protects the Smack attribute explicitly.
808 *
809 * Returns 0 if access is permitted, an error code otherwise
810 */
David Howells8f0cfa52008-04-29 00:59:41 -0700811static int smack_inode_setxattr(struct dentry *dentry, const char *name,
812 const void *value, size_t size, int flags)
Casey Schauflere114e472008-02-04 22:29:50 -0800813{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200814 struct smk_audit_info ad;
Casey Schaufler19760ad2013-12-16 16:27:26 -0800815 struct smack_known *skp;
816 int check_priv = 0;
817 int check_import = 0;
818 int check_star = 0;
Casey Schauflerbcdca222008-02-23 15:24:04 -0800819 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -0800820
Casey Schaufler19760ad2013-12-16 16:27:26 -0800821 /*
822 * Check label validity here so import won't fail in post_setxattr
823 */
Casey Schauflerbcdca222008-02-23 15:24:04 -0800824 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
825 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
Casey Schaufler19760ad2013-12-16 16:27:26 -0800826 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
827 check_priv = 1;
828 check_import = 1;
829 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
830 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
831 check_priv = 1;
832 check_import = 1;
833 check_star = 1;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200834 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
Casey Schaufler19760ad2013-12-16 16:27:26 -0800835 check_priv = 1;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200836 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
Casey Schaufler19760ad2013-12-16 16:27:26 -0800842 if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
843 rc = -EPERM;
844
845 if (rc == 0 && check_import) {
846 skp = smk_import_entry(value, size);
847 if (skp == NULL || (check_star &&
848 (skp == &smack_known_star || skp == &smack_known_web)))
849 rc = -EINVAL;
850 }
851
Eric Parisa2694342011-04-25 13:10:27 -0400852 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200853 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
854
Casey Schauflerbcdca222008-02-23 15:24:04 -0800855 if (rc == 0)
Etienne Bassetecfcc532009-04-08 20:40:06 +0200856 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
Casey Schauflerbcdca222008-02-23 15:24:04 -0800857
858 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -0800859}
860
861/**
862 * smack_inode_post_setxattr - Apply the Smack update approved above
863 * @dentry: object
864 * @name: attribute name
865 * @value: attribute value
866 * @size: attribute size
867 * @flags: unused
868 *
869 * Set the pointer in the inode blob to the entry found
870 * in the master label list.
871 */
David Howells8f0cfa52008-04-29 00:59:41 -0700872static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
873 const void *value, size_t size, int flags)
Casey Schauflere114e472008-02-04 22:29:50 -0800874{
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700875 struct smack_known *skp;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200876 struct inode_smack *isp = dentry->d_inode->i_security;
Casey Schaufler676dac42010-12-02 06:43:39 -0800877
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700878 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
879 isp->smk_flags |= SMK_INODE_TRANSMUTE;
880 return;
881 }
882
883 skp = smk_import_entry(value, size);
Casey Schaufler676dac42010-12-02 06:43:39 -0800884 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700885 if (skp != NULL)
886 isp->smk_inode = skp->smk_known;
Casey Schaufler676dac42010-12-02 06:43:39 -0800887 else
888 isp->smk_inode = smack_known_invalid.smk_known;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200889 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700890 if (skp != NULL)
891 isp->smk_task = skp;
Casey Schaufler676dac42010-12-02 06:43:39 -0800892 else
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700893 isp->smk_task = &smack_known_invalid;
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800894 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700895 if (skp != NULL)
896 isp->smk_mmap = skp;
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800897 else
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700898 isp->smk_mmap = &smack_known_invalid;
899 }
Casey Schauflere114e472008-02-04 22:29:50 -0800900
901 return;
902}
903
Casey Schauflerce8a4322011-09-29 18:21:01 -0700904/**
Casey Schauflere114e472008-02-04 22:29:50 -0800905 * smack_inode_getxattr - Smack check on getxattr
906 * @dentry: the object
907 * @name: unused
908 *
909 * Returns 0 if access is permitted, an error code otherwise
910 */
David Howells8f0cfa52008-04-29 00:59:41 -0700911static int smack_inode_getxattr(struct dentry *dentry, const char *name)
Casey Schauflere114e472008-02-04 22:29:50 -0800912{
Etienne Bassetecfcc532009-04-08 20:40:06 +0200913 struct smk_audit_info ad;
914
Eric Parisa2694342011-04-25 13:10:27 -0400915 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200916 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
917
918 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -0800919}
920
Casey Schauflerce8a4322011-09-29 18:21:01 -0700921/**
Casey Schauflere114e472008-02-04 22:29:50 -0800922 * smack_inode_removexattr - Smack check on removexattr
923 * @dentry: the object
924 * @name: name of the attribute
925 *
926 * Removing the Smack attribute requires CAP_MAC_ADMIN
927 *
928 * Returns 0 if access is permitted, an error code otherwise
929 */
David Howells8f0cfa52008-04-29 00:59:41 -0700930static int smack_inode_removexattr(struct dentry *dentry, const char *name)
Casey Schauflere114e472008-02-04 22:29:50 -0800931{
Casey Schaufler676dac42010-12-02 06:43:39 -0800932 struct inode_smack *isp;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200933 struct smk_audit_info ad;
Casey Schauflerbcdca222008-02-23 15:24:04 -0800934 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -0800935
Casey Schauflerbcdca222008-02-23 15:24:04 -0800936 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
937 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
Casey Schaufler676dac42010-12-02 06:43:39 -0800938 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +0200939 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800940 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
941 strcmp(name, XATTR_NAME_SMACKMMAP)) {
Casey Schaufler1880eff2012-06-05 15:28:30 -0700942 if (!smack_privileged(CAP_MAC_ADMIN))
Casey Schauflerbcdca222008-02-23 15:24:04 -0800943 rc = -EPERM;
944 } else
945 rc = cap_inode_removexattr(dentry, name);
946
Eric Parisa2694342011-04-25 13:10:27 -0400947 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200948 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
Casey Schauflerbcdca222008-02-23 15:24:04 -0800949 if (rc == 0)
Etienne Bassetecfcc532009-04-08 20:40:06 +0200950 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
Casey Schauflerbcdca222008-02-23 15:24:04 -0800951
Casey Schaufler676dac42010-12-02 06:43:39 -0800952 if (rc == 0) {
953 isp = dentry->d_inode->i_security;
954 isp->smk_task = NULL;
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800955 isp->smk_mmap = NULL;
Casey Schaufler676dac42010-12-02 06:43:39 -0800956 }
957
Casey Schauflerbcdca222008-02-23 15:24:04 -0800958 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -0800959}
960
961/**
962 * smack_inode_getsecurity - get smack xattrs
963 * @inode: the object
964 * @name: attribute name
965 * @buffer: where to put the result
Randy Dunlap251a2a92009-02-18 11:42:33 -0800966 * @alloc: unused
Casey Schauflere114e472008-02-04 22:29:50 -0800967 *
968 * Returns the size of the attribute or an error code
969 */
970static int smack_inode_getsecurity(const struct inode *inode,
971 const char *name, void **buffer,
972 bool alloc)
973{
974 struct socket_smack *ssp;
975 struct socket *sock;
976 struct super_block *sbp;
977 struct inode *ip = (struct inode *)inode;
978 char *isp;
979 int ilen;
980 int rc = 0;
981
982 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
983 isp = smk_of_inode(inode);
984 ilen = strlen(isp) + 1;
985 *buffer = isp;
986 return ilen;
987 }
988
989 /*
990 * The rest of the Smack xattrs are only on sockets.
991 */
992 sbp = ip->i_sb;
993 if (sbp->s_magic != SOCKFS_MAGIC)
994 return -EOPNOTSUPP;
995
996 sock = SOCKET_I(ip);
Ahmed S. Darwish2e1d1462008-02-13 15:03:34 -0800997 if (sock == NULL || sock->sk == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -0800998 return -EOPNOTSUPP;
999
1000 ssp = sock->sk->sk_security;
1001
1002 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1003 isp = ssp->smk_in;
1004 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001005 isp = ssp->smk_out->smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08001006 else
1007 return -EOPNOTSUPP;
1008
1009 ilen = strlen(isp) + 1;
1010 if (rc == 0) {
1011 *buffer = isp;
1012 rc = ilen;
1013 }
1014
1015 return rc;
1016}
1017
1018
1019/**
1020 * smack_inode_listsecurity - list the Smack attributes
1021 * @inode: the object
1022 * @buffer: where they go
1023 * @buffer_size: size of buffer
1024 *
1025 * Returns 0 on success, -EINVAL otherwise
1026 */
1027static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1028 size_t buffer_size)
1029{
1030 int len = strlen(XATTR_NAME_SMACK);
1031
1032 if (buffer != NULL && len <= buffer_size) {
1033 memcpy(buffer, XATTR_NAME_SMACK, len);
1034 return len;
1035 }
1036 return -EINVAL;
1037}
1038
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10001039/**
1040 * smack_inode_getsecid - Extract inode's security id
1041 * @inode: inode to extract the info from
1042 * @secid: where result will be saved
1043 */
1044static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
1045{
1046 struct inode_smack *isp = inode->i_security;
1047
1048 *secid = smack_to_secid(isp->smk_inode);
1049}
1050
Casey Schauflere114e472008-02-04 22:29:50 -08001051/*
1052 * File Hooks
1053 */
1054
1055/**
1056 * smack_file_permission - Smack check on file operations
1057 * @file: unused
1058 * @mask: unused
1059 *
1060 * Returns 0
1061 *
1062 * Should access checks be done on each read or write?
1063 * UNICOS and SELinux say yes.
1064 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1065 *
1066 * I'll say no for now. Smack does not do the frequent
1067 * label changing that SELinux does.
1068 */
1069static int smack_file_permission(struct file *file, int mask)
1070{
1071 return 0;
1072}
1073
1074/**
1075 * smack_file_alloc_security - assign a file security blob
1076 * @file: the object
1077 *
1078 * The security blob for a file is a pointer to the master
1079 * label list, so no allocation is done.
1080 *
1081 * Returns 0
1082 */
1083static int smack_file_alloc_security(struct file *file)
1084{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001085 struct smack_known *skp = smk_of_current();
1086
1087 file->f_security = skp->smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08001088 return 0;
1089}
1090
1091/**
1092 * smack_file_free_security - clear a file security blob
1093 * @file: the object
1094 *
1095 * The security blob for a file is a pointer to the master
1096 * label list, so no memory is freed.
1097 */
1098static void smack_file_free_security(struct file *file)
1099{
1100 file->f_security = NULL;
1101}
1102
1103/**
1104 * smack_file_ioctl - Smack check on ioctls
1105 * @file: the object
1106 * @cmd: what to do
1107 * @arg: unused
1108 *
1109 * Relies heavily on the correct use of the ioctl command conventions.
1110 *
1111 * Returns 0 if allowed, error code otherwise
1112 */
1113static int smack_file_ioctl(struct file *file, unsigned int cmd,
1114 unsigned long arg)
1115{
1116 int rc = 0;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001117 struct smk_audit_info ad;
1118
Eric Parisf48b7392011-04-25 12:54:27 -04001119 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001120 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Casey Schauflere114e472008-02-04 22:29:50 -08001121
1122 if (_IOC_DIR(cmd) & _IOC_WRITE)
Etienne Bassetecfcc532009-04-08 20:40:06 +02001123 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001124
1125 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
Etienne Bassetecfcc532009-04-08 20:40:06 +02001126 rc = smk_curacc(file->f_security, MAY_READ, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001127
1128 return rc;
1129}
1130
1131/**
1132 * smack_file_lock - Smack check on file locking
1133 * @file: the object
Randy Dunlap251a2a92009-02-18 11:42:33 -08001134 * @cmd: unused
Casey Schauflere114e472008-02-04 22:29:50 -08001135 *
Casey Schauflerc0ab6e52013-10-11 18:06:39 -07001136 * Returns 0 if current has lock access, error code otherwise
Casey Schauflere114e472008-02-04 22:29:50 -08001137 */
1138static int smack_file_lock(struct file *file, unsigned int cmd)
1139{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001140 struct smk_audit_info ad;
1141
Eric Paris92f42502011-04-25 13:15:55 -04001142 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1143 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Casey Schauflerc0ab6e52013-10-11 18:06:39 -07001144 return smk_curacc(file->f_security, MAY_LOCK, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001145}
1146
1147/**
1148 * smack_file_fcntl - Smack check on fcntl
1149 * @file: the object
1150 * @cmd: what action to check
1151 * @arg: unused
1152 *
Casey Schaufler531f1d42011-09-19 12:41:42 -07001153 * Generally these operations are harmless.
1154 * File locking operations present an obvious mechanism
1155 * for passing information, so they require write access.
1156 *
Casey Schauflere114e472008-02-04 22:29:50 -08001157 * Returns 0 if current has access, error code otherwise
1158 */
1159static int smack_file_fcntl(struct file *file, unsigned int cmd,
1160 unsigned long arg)
1161{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001162 struct smk_audit_info ad;
Casey Schaufler531f1d42011-09-19 12:41:42 -07001163 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08001164
Etienne Bassetecfcc532009-04-08 20:40:06 +02001165
Casey Schauflere114e472008-02-04 22:29:50 -08001166 switch (cmd) {
Casey Schauflere114e472008-02-04 22:29:50 -08001167 case F_GETLK:
Casey Schauflerc0ab6e52013-10-11 18:06:39 -07001168 break;
Casey Schauflere114e472008-02-04 22:29:50 -08001169 case F_SETLK:
1170 case F_SETLKW:
Casey Schauflerc0ab6e52013-10-11 18:06:39 -07001171 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1172 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1173 rc = smk_curacc(file->f_security, MAY_LOCK, &ad);
1174 break;
Casey Schauflere114e472008-02-04 22:29:50 -08001175 case F_SETOWN:
1176 case F_SETSIG:
Casey Schaufler531f1d42011-09-19 12:41:42 -07001177 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1178 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001179 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001180 break;
1181 default:
Casey Schaufler531f1d42011-09-19 12:41:42 -07001182 break;
Casey Schauflere114e472008-02-04 22:29:50 -08001183 }
1184
1185 return rc;
1186}
1187
1188/**
Al Viroe5467852012-05-30 13:30:51 -04001189 * smack_mmap_file :
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001190 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1191 * if mapping anonymous memory.
1192 * @file contains the file structure for file to map (may be NULL).
1193 * @reqprot contains the protection requested by the application.
1194 * @prot contains the protection that will be applied by the kernel.
1195 * @flags contains the operational flags.
1196 * Return 0 if permission is granted.
1197 */
Al Viroe5467852012-05-30 13:30:51 -04001198static int smack_mmap_file(struct file *file,
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001199 unsigned long reqprot, unsigned long prot,
Al Viroe5467852012-05-30 13:30:51 -04001200 unsigned long flags)
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001201{
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001202 struct smack_known *skp;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001203 struct smack_known *mkp;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001204 struct smack_rule *srp;
1205 struct task_smack *tsp;
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001206 char *osmack;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001207 struct inode_smack *isp;
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001208 int may;
1209 int mmay;
1210 int tmay;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001211 int rc;
1212
Al Viro496ad9a2013-01-23 17:07:38 -05001213 if (file == NULL)
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001214 return 0;
1215
Al Viro496ad9a2013-01-23 17:07:38 -05001216 isp = file_inode(file)->i_security;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001217 if (isp->smk_mmap == NULL)
1218 return 0;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001219 mkp = isp->smk_mmap;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001220
1221 tsp = current_security();
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001222 skp = smk_of_current();
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001223 rc = 0;
1224
1225 rcu_read_lock();
1226 /*
1227 * For each Smack rule associated with the subject
1228 * label verify that the SMACK64MMAP also has access
1229 * to that rule's object label.
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001230 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001231 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001232 osmack = srp->smk_object;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001233 /*
1234 * Matching labels always allows access.
1235 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001236 if (mkp->smk_known == osmack)
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001237 continue;
1238 /*
1239 * If there is a matching local rule take
1240 * that into account as well.
1241 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001242 may = smk_access_entry(srp->smk_subject->smk_known, osmack,
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001243 &tsp->smk_rules);
1244 if (may == -ENOENT)
1245 may = srp->smk_access;
1246 else
1247 may &= srp->smk_access;
1248 /*
1249 * If may is zero the SMACK64MMAP subject can't
1250 * possibly have less access.
1251 */
1252 if (may == 0)
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001253 continue;
1254
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001255 /*
1256 * Fetch the global list entry.
1257 * If there isn't one a SMACK64MMAP subject
1258 * can't have as much access as current.
1259 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001260 mmay = smk_access_entry(mkp->smk_known, osmack,
1261 &mkp->smk_rules);
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001262 if (mmay == -ENOENT) {
1263 rc = -EACCES;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001264 break;
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001265 }
1266 /*
1267 * If there is a local entry it modifies the
1268 * potential access, too.
1269 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001270 tmay = smk_access_entry(mkp->smk_known, osmack,
1271 &tsp->smk_rules);
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001272 if (tmay != -ENOENT)
1273 mmay &= tmay;
1274
1275 /*
1276 * If there is any access available to current that is
1277 * not available to a SMACK64MMAP subject
1278 * deny access.
1279 */
Casey Schaufler75a25632011-02-09 19:58:42 -08001280 if ((may | mmay) != mmay) {
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001281 rc = -EACCES;
1282 break;
1283 }
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001284 }
1285
1286 rcu_read_unlock();
1287
1288 return rc;
1289}
1290
1291/**
Casey Schauflere114e472008-02-04 22:29:50 -08001292 * smack_file_set_fowner - set the file security blob value
1293 * @file: object in question
1294 *
1295 * Returns 0
1296 * Further research may be required on this one.
1297 */
1298static int smack_file_set_fowner(struct file *file)
1299{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001300 struct smack_known *skp = smk_of_current();
1301
1302 file->f_security = skp->smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08001303 return 0;
1304}
1305
1306/**
1307 * smack_file_send_sigiotask - Smack on sigio
1308 * @tsk: The target task
1309 * @fown: the object the signal come from
1310 * @signum: unused
1311 *
1312 * Allow a privileged task to get signals even if it shouldn't
1313 *
1314 * Returns 0 if a subject with the object's smack could
1315 * write to the task, an error code otherwise.
1316 */
1317static int smack_file_send_sigiotask(struct task_struct *tsk,
1318 struct fown_struct *fown, int signum)
1319{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001320 struct smack_known *skp;
1321 struct smack_known *tkp = smk_of_task(tsk->cred->security);
Casey Schauflere114e472008-02-04 22:29:50 -08001322 struct file *file;
1323 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001324 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -08001325
1326 /*
1327 * struct fown_struct is never outside the context of a struct file
1328 */
1329 file = container_of(fown, struct file, f_owner);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001330
Etienne Bassetecfcc532009-04-08 20:40:06 +02001331 /* we don't log here as rc can be overriden */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001332 skp = smk_find_entry(file->f_security);
1333 rc = smk_access(skp, tkp->smk_known, MAY_WRITE, NULL);
David Howells5cd9c582008-08-14 11:37:28 +01001334 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
Etienne Bassetecfcc532009-04-08 20:40:06 +02001335 rc = 0;
1336
1337 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1338 smk_ad_setfield_u_tsk(&ad, tsk);
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001339 smack_log(file->f_security, tkp->smk_known, MAY_WRITE, rc, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001340 return rc;
1341}
1342
1343/**
1344 * smack_file_receive - Smack file receive check
1345 * @file: the object
1346 *
1347 * Returns 0 if current has access, error code otherwise
1348 */
1349static int smack_file_receive(struct file *file)
1350{
1351 int may = 0;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001352 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -08001353
Casey Schaufler4482a442013-12-30 17:37:45 -08001354 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001355 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Casey Schauflere114e472008-02-04 22:29:50 -08001356 /*
1357 * This code relies on bitmasks.
1358 */
1359 if (file->f_mode & FMODE_READ)
1360 may = MAY_READ;
1361 if (file->f_mode & FMODE_WRITE)
1362 may |= MAY_WRITE;
1363
Etienne Bassetecfcc532009-04-08 20:40:06 +02001364 return smk_curacc(file->f_security, may, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001365}
1366
Casey Schaufler531f1d42011-09-19 12:41:42 -07001367/**
Eric Paris83d49852012-04-04 13:45:40 -04001368 * smack_file_open - Smack dentry open processing
Casey Schaufler531f1d42011-09-19 12:41:42 -07001369 * @file: the object
1370 * @cred: unused
1371 *
1372 * Set the security blob in the file structure.
1373 *
1374 * Returns 0
1375 */
Eric Paris83d49852012-04-04 13:45:40 -04001376static int smack_file_open(struct file *file, const struct cred *cred)
Casey Schaufler531f1d42011-09-19 12:41:42 -07001377{
Al Viro496ad9a2013-01-23 17:07:38 -05001378 struct inode_smack *isp = file_inode(file)->i_security;
Casey Schaufler531f1d42011-09-19 12:41:42 -07001379
1380 file->f_security = isp->smk_inode;
1381
1382 return 0;
1383}
1384
Casey Schauflere114e472008-02-04 22:29:50 -08001385/*
1386 * Task hooks
1387 */
1388
1389/**
David Howellsee18d642009-09-02 09:14:21 +01001390 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1391 * @new: the new credentials
1392 * @gfp: the atomicity of any memory allocations
1393 *
1394 * Prepare a blank set of credentials for modification. This must allocate all
1395 * the memory the LSM module might require such that cred_transfer() can
1396 * complete without error.
1397 */
1398static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1399{
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001400 struct task_smack *tsp;
1401
1402 tsp = new_task_smack(NULL, NULL, gfp);
1403 if (tsp == NULL)
Casey Schaufler676dac42010-12-02 06:43:39 -08001404 return -ENOMEM;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001405
1406 cred->security = tsp;
1407
David Howellsee18d642009-09-02 09:14:21 +01001408 return 0;
1409}
1410
1411
1412/**
David Howellsf1752ee2008-11-14 10:39:17 +11001413 * smack_cred_free - "free" task-level security credentials
1414 * @cred: the credentials in question
Casey Schauflere114e472008-02-04 22:29:50 -08001415 *
Casey Schauflere114e472008-02-04 22:29:50 -08001416 */
David Howellsf1752ee2008-11-14 10:39:17 +11001417static void smack_cred_free(struct cred *cred)
Casey Schauflere114e472008-02-04 22:29:50 -08001418{
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001419 struct task_smack *tsp = cred->security;
1420 struct smack_rule *rp;
1421 struct list_head *l;
1422 struct list_head *n;
1423
1424 if (tsp == NULL)
1425 return;
1426 cred->security = NULL;
1427
1428 list_for_each_safe(l, n, &tsp->smk_rules) {
1429 rp = list_entry(l, struct smack_rule, list);
1430 list_del(&rp->list);
1431 kfree(rp);
1432 }
1433 kfree(tsp);
Casey Schauflere114e472008-02-04 22:29:50 -08001434}
1435
1436/**
David Howellsd84f4f92008-11-14 10:39:23 +11001437 * smack_cred_prepare - prepare new set of credentials for modification
1438 * @new: the new credentials
1439 * @old: the original credentials
1440 * @gfp: the atomicity of any memory allocations
1441 *
1442 * Prepare a new set of credentials for modification.
1443 */
1444static int smack_cred_prepare(struct cred *new, const struct cred *old,
1445 gfp_t gfp)
1446{
Casey Schaufler676dac42010-12-02 06:43:39 -08001447 struct task_smack *old_tsp = old->security;
1448 struct task_smack *new_tsp;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001449 int rc;
Casey Schaufler676dac42010-12-02 06:43:39 -08001450
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001451 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
Casey Schaufler676dac42010-12-02 06:43:39 -08001452 if (new_tsp == NULL)
1453 return -ENOMEM;
1454
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001455 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1456 if (rc != 0)
1457 return rc;
1458
Casey Schaufler676dac42010-12-02 06:43:39 -08001459 new->security = new_tsp;
David Howellsd84f4f92008-11-14 10:39:23 +11001460 return 0;
1461}
1462
Randy Dunlap251a2a92009-02-18 11:42:33 -08001463/**
David Howellsee18d642009-09-02 09:14:21 +01001464 * smack_cred_transfer - Transfer the old credentials to the new credentials
1465 * @new: the new credentials
1466 * @old: the original credentials
1467 *
1468 * Fill in a set of blank credentials from another set of credentials.
1469 */
1470static void smack_cred_transfer(struct cred *new, const struct cred *old)
1471{
Casey Schaufler676dac42010-12-02 06:43:39 -08001472 struct task_smack *old_tsp = old->security;
1473 struct task_smack *new_tsp = new->security;
1474
1475 new_tsp->smk_task = old_tsp->smk_task;
1476 new_tsp->smk_forked = old_tsp->smk_task;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001477 mutex_init(&new_tsp->smk_rules_lock);
1478 INIT_LIST_HEAD(&new_tsp->smk_rules);
1479
1480
1481 /* cbs copy rule list */
David Howellsee18d642009-09-02 09:14:21 +01001482}
1483
1484/**
David Howells3a3b7ce2008-11-14 10:39:28 +11001485 * smack_kernel_act_as - Set the subjective context in a set of credentials
Randy Dunlap251a2a92009-02-18 11:42:33 -08001486 * @new: points to the set of credentials to be modified.
1487 * @secid: specifies the security ID to be set
David Howells3a3b7ce2008-11-14 10:39:28 +11001488 *
1489 * Set the security data for a kernel service.
1490 */
1491static int smack_kernel_act_as(struct cred *new, u32 secid)
1492{
Casey Schaufler676dac42010-12-02 06:43:39 -08001493 struct task_smack *new_tsp = new->security;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001494 struct smack_known *skp = smack_from_secid(secid);
David Howells3a3b7ce2008-11-14 10:39:28 +11001495
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001496 if (skp == NULL)
David Howells3a3b7ce2008-11-14 10:39:28 +11001497 return -EINVAL;
1498
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001499 new_tsp->smk_task = skp;
David Howells3a3b7ce2008-11-14 10:39:28 +11001500 return 0;
1501}
1502
1503/**
1504 * smack_kernel_create_files_as - Set the file creation label in a set of creds
Randy Dunlap251a2a92009-02-18 11:42:33 -08001505 * @new: points to the set of credentials to be modified
1506 * @inode: points to the inode to use as a reference
David Howells3a3b7ce2008-11-14 10:39:28 +11001507 *
1508 * Set the file creation context in a set of credentials to the same
1509 * as the objective context of the specified inode
1510 */
1511static int smack_kernel_create_files_as(struct cred *new,
1512 struct inode *inode)
1513{
1514 struct inode_smack *isp = inode->i_security;
Casey Schaufler676dac42010-12-02 06:43:39 -08001515 struct task_smack *tsp = new->security;
David Howells3a3b7ce2008-11-14 10:39:28 +11001516
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001517 tsp->smk_forked = smk_find_entry(isp->smk_inode);
1518 tsp->smk_task = tsp->smk_forked;
David Howells3a3b7ce2008-11-14 10:39:28 +11001519 return 0;
1520}
1521
1522/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02001523 * smk_curacc_on_task - helper to log task related access
1524 * @p: the task object
Casey Schaufler531f1d42011-09-19 12:41:42 -07001525 * @access: the access requested
1526 * @caller: name of the calling function for audit
Etienne Bassetecfcc532009-04-08 20:40:06 +02001527 *
1528 * Return 0 if access is permitted
1529 */
Casey Schaufler531f1d42011-09-19 12:41:42 -07001530static int smk_curacc_on_task(struct task_struct *p, int access,
1531 const char *caller)
Etienne Bassetecfcc532009-04-08 20:40:06 +02001532{
1533 struct smk_audit_info ad;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001534 struct smack_known *skp = smk_of_task(task_security(p));
Etienne Bassetecfcc532009-04-08 20:40:06 +02001535
Casey Schaufler531f1d42011-09-19 12:41:42 -07001536 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001537 smk_ad_setfield_u_tsk(&ad, p);
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001538 return smk_curacc(skp->smk_known, access, &ad);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001539}
1540
1541/**
Casey Schauflere114e472008-02-04 22:29:50 -08001542 * smack_task_setpgid - Smack check on setting pgid
1543 * @p: the task object
1544 * @pgid: unused
1545 *
1546 * Return 0 if write access is permitted
1547 */
1548static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1549{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001550 return smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001551}
1552
1553/**
1554 * smack_task_getpgid - Smack access check for getpgid
1555 * @p: the object task
1556 *
1557 * Returns 0 if current can read the object task, error code otherwise
1558 */
1559static int smack_task_getpgid(struct task_struct *p)
1560{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001561 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001562}
1563
1564/**
1565 * smack_task_getsid - Smack access check for getsid
1566 * @p: the object task
1567 *
1568 * Returns 0 if current can read the object task, error code otherwise
1569 */
1570static int smack_task_getsid(struct task_struct *p)
1571{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001572 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001573}
1574
1575/**
1576 * smack_task_getsecid - get the secid of the task
1577 * @p: the object task
1578 * @secid: where to put the result
1579 *
1580 * Sets the secid to contain a u32 version of the smack label.
1581 */
1582static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1583{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001584 struct smack_known *skp = smk_of_task(task_security(p));
1585
1586 *secid = skp->smk_secid;
Casey Schauflere114e472008-02-04 22:29:50 -08001587}
1588
1589/**
1590 * smack_task_setnice - Smack check on setting nice
1591 * @p: the task object
1592 * @nice: unused
1593 *
1594 * Return 0 if write access is permitted
1595 */
1596static int smack_task_setnice(struct task_struct *p, int nice)
1597{
Casey Schauflerbcdca222008-02-23 15:24:04 -08001598 int rc;
1599
1600 rc = cap_task_setnice(p, nice);
1601 if (rc == 0)
Casey Schaufler531f1d42011-09-19 12:41:42 -07001602 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflerbcdca222008-02-23 15:24:04 -08001603 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001604}
1605
1606/**
1607 * smack_task_setioprio - Smack check on setting ioprio
1608 * @p: the task object
1609 * @ioprio: unused
1610 *
1611 * Return 0 if write access is permitted
1612 */
1613static int smack_task_setioprio(struct task_struct *p, int ioprio)
1614{
Casey Schauflerbcdca222008-02-23 15:24:04 -08001615 int rc;
1616
1617 rc = cap_task_setioprio(p, ioprio);
1618 if (rc == 0)
Casey Schaufler531f1d42011-09-19 12:41:42 -07001619 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflerbcdca222008-02-23 15:24:04 -08001620 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001621}
1622
1623/**
1624 * smack_task_getioprio - Smack check on reading ioprio
1625 * @p: the task object
1626 *
1627 * Return 0 if read access is permitted
1628 */
1629static int smack_task_getioprio(struct task_struct *p)
1630{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001631 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001632}
1633
1634/**
1635 * smack_task_setscheduler - Smack check on setting scheduler
1636 * @p: the task object
1637 * @policy: unused
1638 * @lp: unused
1639 *
1640 * Return 0 if read access is permitted
1641 */
KOSAKI Motohirob0ae1982010-10-15 04:21:18 +09001642static int smack_task_setscheduler(struct task_struct *p)
Casey Schauflere114e472008-02-04 22:29:50 -08001643{
Casey Schauflerbcdca222008-02-23 15:24:04 -08001644 int rc;
1645
KOSAKI Motohirob0ae1982010-10-15 04:21:18 +09001646 rc = cap_task_setscheduler(p);
Casey Schauflerbcdca222008-02-23 15:24:04 -08001647 if (rc == 0)
Casey Schaufler531f1d42011-09-19 12:41:42 -07001648 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflerbcdca222008-02-23 15:24:04 -08001649 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001650}
1651
1652/**
1653 * smack_task_getscheduler - Smack check on reading scheduler
1654 * @p: the task object
1655 *
1656 * Return 0 if read access is permitted
1657 */
1658static int smack_task_getscheduler(struct task_struct *p)
1659{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001660 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001661}
1662
1663/**
1664 * smack_task_movememory - Smack check on moving memory
1665 * @p: the task object
1666 *
1667 * Return 0 if write access is permitted
1668 */
1669static int smack_task_movememory(struct task_struct *p)
1670{
Casey Schaufler531f1d42011-09-19 12:41:42 -07001671 return smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08001672}
1673
1674/**
1675 * smack_task_kill - Smack check on signal delivery
1676 * @p: the task object
1677 * @info: unused
1678 * @sig: unused
1679 * @secid: identifies the smack to use in lieu of current's
1680 *
1681 * Return 0 if write access is permitted
1682 *
1683 * The secid behavior is an artifact of an SELinux hack
1684 * in the USB code. Someday it may go away.
1685 */
1686static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1687 int sig, u32 secid)
1688{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001689 struct smk_audit_info ad;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001690 struct smack_known *skp;
1691 struct smack_known *tkp = smk_of_task(task_security(p));
Etienne Bassetecfcc532009-04-08 20:40:06 +02001692
1693 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1694 smk_ad_setfield_u_tsk(&ad, p);
Casey Schauflere114e472008-02-04 22:29:50 -08001695 /*
Casey Schauflere114e472008-02-04 22:29:50 -08001696 * Sending a signal requires that the sender
1697 * can write the receiver.
1698 */
1699 if (secid == 0)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001700 return smk_curacc(tkp->smk_known, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001701 /*
1702 * If the secid isn't 0 we're dealing with some USB IO
1703 * specific behavior. This is not clean. For one thing
1704 * we can't take privilege into account.
1705 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001706 skp = smack_from_secid(secid);
1707 return smk_access(skp, tkp->smk_known, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001708}
1709
1710/**
1711 * smack_task_wait - Smack access check for waiting
1712 * @p: task to wait for
1713 *
Casey Schauflerc00bedb2012-08-09 17:46:38 -07001714 * Returns 0
Casey Schauflere114e472008-02-04 22:29:50 -08001715 */
1716static int smack_task_wait(struct task_struct *p)
1717{
Casey Schauflere114e472008-02-04 22:29:50 -08001718 /*
Casey Schauflerc00bedb2012-08-09 17:46:38 -07001719 * Allow the operation to succeed.
1720 * Zombies are bad.
1721 * In userless environments (e.g. phones) programs
1722 * get marked with SMACK64EXEC and even if the parent
1723 * and child shouldn't be talking the parent still
1724 * may expect to know when the child exits.
Casey Schauflere114e472008-02-04 22:29:50 -08001725 */
Casey Schauflerc00bedb2012-08-09 17:46:38 -07001726 return 0;
Casey Schauflere114e472008-02-04 22:29:50 -08001727}
1728
1729/**
1730 * smack_task_to_inode - copy task smack into the inode blob
1731 * @p: task to copy from
Randy Dunlap251a2a92009-02-18 11:42:33 -08001732 * @inode: inode to copy to
Casey Schauflere114e472008-02-04 22:29:50 -08001733 *
1734 * Sets the smack pointer in the inode security blob
1735 */
1736static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1737{
1738 struct inode_smack *isp = inode->i_security;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001739 struct smack_known *skp = smk_of_task(task_security(p));
1740
1741 isp->smk_inode = skp->smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08001742}
1743
1744/*
1745 * Socket hooks.
1746 */
1747
1748/**
1749 * smack_sk_alloc_security - Allocate a socket blob
1750 * @sk: the socket
1751 * @family: unused
Randy Dunlap251a2a92009-02-18 11:42:33 -08001752 * @gfp_flags: memory allocation flags
Casey Schauflere114e472008-02-04 22:29:50 -08001753 *
1754 * Assign Smack pointers to current
1755 *
1756 * Returns 0 on success, -ENOMEM is there's no memory
1757 */
1758static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1759{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001760 struct smack_known *skp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08001761 struct socket_smack *ssp;
1762
1763 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1764 if (ssp == NULL)
1765 return -ENOMEM;
1766
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001767 ssp->smk_in = skp->smk_known;
1768 ssp->smk_out = skp;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001769 ssp->smk_packet = NULL;
Casey Schauflere114e472008-02-04 22:29:50 -08001770
1771 sk->sk_security = ssp;
1772
1773 return 0;
1774}
1775
1776/**
1777 * smack_sk_free_security - Free a socket blob
1778 * @sk: the socket
1779 *
1780 * Clears the blob pointer
1781 */
1782static void smack_sk_free_security(struct sock *sk)
1783{
1784 kfree(sk->sk_security);
1785}
1786
1787/**
Paul Moore07feee82009-03-27 17:10:54 -04001788* smack_host_label - check host based restrictions
1789* @sip: the object end
1790*
1791* looks for host based access restrictions
1792*
1793* This version will only be appropriate for really small sets of single label
1794* hosts. The caller is responsible for ensuring that the RCU read lock is
1795* taken before calling this function.
1796*
1797* Returns the label of the far end or NULL if it's not special.
1798*/
1799static char *smack_host_label(struct sockaddr_in *sip)
1800{
1801 struct smk_netlbladdr *snp;
1802 struct in_addr *siap = &sip->sin_addr;
1803
1804 if (siap->s_addr == 0)
1805 return NULL;
1806
1807 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1808 /*
1809 * we break after finding the first match because
1810 * the list is sorted from longest to shortest mask
1811 * so we have found the most specific match
1812 */
1813 if ((&snp->smk_host.sin_addr)->s_addr ==
Etienne Basset43031542009-03-27 17:11:01 -04001814 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1815 /* we have found the special CIPSO option */
1816 if (snp->smk_label == smack_cipso_option)
1817 return NULL;
Paul Moore07feee82009-03-27 17:10:54 -04001818 return snp->smk_label;
Etienne Basset43031542009-03-27 17:11:01 -04001819 }
Paul Moore07feee82009-03-27 17:10:54 -04001820
1821 return NULL;
1822}
1823
1824/**
Casey Schauflere114e472008-02-04 22:29:50 -08001825 * smack_netlabel - Set the secattr on a socket
1826 * @sk: the socket
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001827 * @labeled: socket label scheme
Casey Schauflere114e472008-02-04 22:29:50 -08001828 *
1829 * Convert the outbound smack value (smk_out) to a
1830 * secattr and attach it to the socket.
1831 *
1832 * Returns 0 on success or an error code
1833 */
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001834static int smack_netlabel(struct sock *sk, int labeled)
Casey Schauflere114e472008-02-04 22:29:50 -08001835{
Casey Schauflerf7112e62012-05-06 15:22:02 -07001836 struct smack_known *skp;
Paul Moore07feee82009-03-27 17:10:54 -04001837 struct socket_smack *ssp = sk->sk_security;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001838 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08001839
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001840 /*
1841 * Usually the netlabel code will handle changing the
1842 * packet labeling based on the label.
1843 * The case of a single label host is different, because
1844 * a single label host should never get a labeled packet
1845 * even though the label is usually associated with a packet
1846 * label.
1847 */
1848 local_bh_disable();
1849 bh_lock_sock_nested(sk);
1850
1851 if (ssp->smk_out == smack_net_ambient ||
1852 labeled == SMACK_UNLABELED_SOCKET)
1853 netlbl_sock_delattr(sk);
1854 else {
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001855 skp = ssp->smk_out;
Casey Schauflerf7112e62012-05-06 15:22:02 -07001856 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05001857 }
1858
1859 bh_unlock_sock(sk);
1860 local_bh_enable();
Casey Schaufler4bc87e62008-02-15 15:24:25 -08001861
Casey Schauflere114e472008-02-04 22:29:50 -08001862 return rc;
1863}
1864
1865/**
Paul Moore07feee82009-03-27 17:10:54 -04001866 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1867 * @sk: the socket
1868 * @sap: the destination address
1869 *
1870 * Set the correct secattr for the given socket based on the destination
1871 * address and perform any outbound access checks needed.
1872 *
1873 * Returns 0 on success or an error code.
1874 *
1875 */
1876static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1877{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001878 struct smack_known *skp;
Paul Moore07feee82009-03-27 17:10:54 -04001879 int rc;
1880 int sk_lbl;
1881 char *hostsp;
1882 struct socket_smack *ssp = sk->sk_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001883 struct smk_audit_info ad;
Paul Moore07feee82009-03-27 17:10:54 -04001884
1885 rcu_read_lock();
1886 hostsp = smack_host_label(sap);
1887 if (hostsp != NULL) {
Etienne Bassetecfcc532009-04-08 20:40:06 +02001888#ifdef CONFIG_AUDIT
Kees Cook923e9a12012-04-10 13:26:44 -07001889 struct lsm_network_audit net;
1890
Eric Paris48c62af2012-04-02 13:15:44 -04001891 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
1892 ad.a.u.net->family = sap->sin_family;
1893 ad.a.u.net->dport = sap->sin_port;
1894 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001895#endif
Kees Cook923e9a12012-04-10 13:26:44 -07001896 sk_lbl = SMACK_UNLABELED_SOCKET;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001897 skp = ssp->smk_out;
1898 rc = smk_access(skp, hostsp, MAY_WRITE, &ad);
Paul Moore07feee82009-03-27 17:10:54 -04001899 } else {
1900 sk_lbl = SMACK_CIPSO_SOCKET;
1901 rc = 0;
1902 }
1903 rcu_read_unlock();
1904 if (rc != 0)
1905 return rc;
1906
1907 return smack_netlabel(sk, sk_lbl);
1908}
1909
1910/**
Casey Schauflerc6739442013-05-22 18:42:56 -07001911 * smk_ipv6_port_label - Smack port access table management
1912 * @sock: socket
1913 * @address: address
1914 *
1915 * Create or update the port list entry
1916 */
1917static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
1918{
1919 struct sock *sk = sock->sk;
1920 struct sockaddr_in6 *addr6;
1921 struct socket_smack *ssp = sock->sk->sk_security;
1922 struct smk_port_label *spp;
1923 unsigned short port = 0;
1924
1925 if (address == NULL) {
1926 /*
1927 * This operation is changing the Smack information
1928 * on the bound socket. Take the changes to the port
1929 * as well.
1930 */
1931 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
1932 if (sk != spp->smk_sock)
1933 continue;
1934 spp->smk_in = ssp->smk_in;
1935 spp->smk_out = ssp->smk_out;
1936 return;
1937 }
1938 /*
1939 * A NULL address is only used for updating existing
1940 * bound entries. If there isn't one, it's OK.
1941 */
1942 return;
1943 }
1944
1945 addr6 = (struct sockaddr_in6 *)address;
1946 port = ntohs(addr6->sin6_port);
1947 /*
1948 * This is a special case that is safely ignored.
1949 */
1950 if (port == 0)
1951 return;
1952
1953 /*
1954 * Look for an existing port list entry.
1955 * This is an indication that a port is getting reused.
1956 */
1957 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
1958 if (spp->smk_port != port)
1959 continue;
1960 spp->smk_port = port;
1961 spp->smk_sock = sk;
1962 spp->smk_in = ssp->smk_in;
1963 spp->smk_out = ssp->smk_out;
1964 return;
1965 }
1966
1967 /*
1968 * A new port entry is required.
1969 */
1970 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
1971 if (spp == NULL)
1972 return;
1973
1974 spp->smk_port = port;
1975 spp->smk_sock = sk;
1976 spp->smk_in = ssp->smk_in;
1977 spp->smk_out = ssp->smk_out;
1978
1979 list_add(&spp->list, &smk_ipv6_port_list);
1980 return;
1981}
1982
1983/**
1984 * smk_ipv6_port_check - check Smack port access
1985 * @sock: socket
1986 * @address: address
1987 *
1988 * Create or update the port list entry
1989 */
Casey Schaufler6ea06242013-08-05 13:21:22 -07001990static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
Casey Schauflerc6739442013-05-22 18:42:56 -07001991 int act)
1992{
1993 __be16 *bep;
1994 __be32 *be32p;
Casey Schauflerc6739442013-05-22 18:42:56 -07001995 struct smk_port_label *spp;
1996 struct socket_smack *ssp = sk->sk_security;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001997 struct smack_known *skp;
Casey Schauflerc6739442013-05-22 18:42:56 -07001998 unsigned short port = 0;
Casey Schauflerc6739442013-05-22 18:42:56 -07001999 char *object;
2000 struct smk_audit_info ad;
2001#ifdef CONFIG_AUDIT
2002 struct lsm_network_audit net;
2003#endif
2004
2005 if (act == SMK_RECEIVING) {
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002006 skp = smack_net_ambient;
Casey Schauflerc6739442013-05-22 18:42:56 -07002007 object = ssp->smk_in;
2008 } else {
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002009 skp = ssp->smk_out;
2010 object = smack_net_ambient->smk_known;
Casey Schauflerc6739442013-05-22 18:42:56 -07002011 }
2012
2013 /*
2014 * Get the IP address and port from the address.
2015 */
Casey Schaufler6ea06242013-08-05 13:21:22 -07002016 port = ntohs(address->sin6_port);
2017 bep = (__be16 *)(&address->sin6_addr);
2018 be32p = (__be32 *)(&address->sin6_addr);
Casey Schauflerc6739442013-05-22 18:42:56 -07002019
2020 /*
2021 * It's remote, so port lookup does no good.
2022 */
2023 if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1)
2024 goto auditout;
2025
2026 /*
2027 * It's local so the send check has to have passed.
2028 */
2029 if (act == SMK_RECEIVING) {
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002030 skp = &smack_known_web;
Casey Schauflerc6739442013-05-22 18:42:56 -07002031 goto auditout;
2032 }
2033
2034 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2035 if (spp->smk_port != port)
2036 continue;
2037 object = spp->smk_in;
2038 if (act == SMK_CONNECTING)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002039 ssp->smk_packet = spp->smk_out->smk_known;
Casey Schauflerc6739442013-05-22 18:42:56 -07002040 break;
2041 }
2042
2043auditout:
2044
2045#ifdef CONFIG_AUDIT
2046 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2047 ad.a.u.net->family = sk->sk_family;
2048 ad.a.u.net->dport = port;
2049 if (act == SMK_RECEIVING)
Casey Schaufler6ea06242013-08-05 13:21:22 -07002050 ad.a.u.net->v6info.saddr = address->sin6_addr;
Casey Schauflerc6739442013-05-22 18:42:56 -07002051 else
Casey Schaufler6ea06242013-08-05 13:21:22 -07002052 ad.a.u.net->v6info.daddr = address->sin6_addr;
Casey Schauflerc6739442013-05-22 18:42:56 -07002053#endif
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002054 return smk_access(skp, object, MAY_WRITE, &ad);
Casey Schauflerc6739442013-05-22 18:42:56 -07002055}
2056
2057/**
Casey Schauflere114e472008-02-04 22:29:50 -08002058 * smack_inode_setsecurity - set smack xattrs
2059 * @inode: the object
2060 * @name: attribute name
2061 * @value: attribute value
2062 * @size: size of the attribute
2063 * @flags: unused
2064 *
2065 * Sets the named attribute in the appropriate blob
2066 *
2067 * Returns 0 on success, or an error code
2068 */
2069static int smack_inode_setsecurity(struct inode *inode, const char *name,
2070 const void *value, size_t size, int flags)
2071{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002072 struct smack_known *skp;
Casey Schauflere114e472008-02-04 22:29:50 -08002073 struct inode_smack *nsp = inode->i_security;
2074 struct socket_smack *ssp;
2075 struct socket *sock;
Casey Schaufler4bc87e62008-02-15 15:24:25 -08002076 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08002077
Casey Schauflerf7112e62012-05-06 15:22:02 -07002078 if (value == NULL || size > SMK_LONGLABEL || size == 0)
Casey Schauflere114e472008-02-04 22:29:50 -08002079 return -EACCES;
2080
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002081 skp = smk_import_entry(value, size);
2082 if (skp == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08002083 return -EINVAL;
2084
2085 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002086 nsp->smk_inode = skp->smk_known;
David P. Quigleyddd29ec2009-09-09 14:25:37 -04002087 nsp->smk_flags |= SMK_INODE_INSTANT;
Casey Schauflere114e472008-02-04 22:29:50 -08002088 return 0;
2089 }
2090 /*
2091 * The rest of the Smack xattrs are only on sockets.
2092 */
2093 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2094 return -EOPNOTSUPP;
2095
2096 sock = SOCKET_I(inode);
Ahmed S. Darwish2e1d1462008-02-13 15:03:34 -08002097 if (sock == NULL || sock->sk == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08002098 return -EOPNOTSUPP;
2099
2100 ssp = sock->sk->sk_security;
2101
2102 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002103 ssp->smk_in = skp->smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08002104 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002105 ssp->smk_out = skp;
Casey Schauflerc6739442013-05-22 18:42:56 -07002106 if (sock->sk->sk_family == PF_INET) {
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002107 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2108 if (rc != 0)
2109 printk(KERN_WARNING
2110 "Smack: \"%s\" netlbl error %d.\n",
2111 __func__, -rc);
2112 }
Casey Schauflere114e472008-02-04 22:29:50 -08002113 } else
2114 return -EOPNOTSUPP;
2115
Casey Schauflerc6739442013-05-22 18:42:56 -07002116 if (sock->sk->sk_family == PF_INET6)
2117 smk_ipv6_port_label(sock, NULL);
2118
Casey Schauflere114e472008-02-04 22:29:50 -08002119 return 0;
2120}
2121
2122/**
2123 * smack_socket_post_create - finish socket setup
2124 * @sock: the socket
2125 * @family: protocol family
2126 * @type: unused
2127 * @protocol: unused
2128 * @kern: unused
2129 *
2130 * Sets the netlabel information on the socket
2131 *
2132 * Returns 0 on success, and error code otherwise
2133 */
2134static int smack_socket_post_create(struct socket *sock, int family,
2135 int type, int protocol, int kern)
2136{
Ahmed S. Darwish2e1d1462008-02-13 15:03:34 -08002137 if (family != PF_INET || sock->sk == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08002138 return 0;
2139 /*
2140 * Set the outbound netlbl.
2141 */
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002142 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2143}
2144
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002145/**
Casey Schauflerc6739442013-05-22 18:42:56 -07002146 * smack_socket_bind - record port binding information.
2147 * @sock: the socket
2148 * @address: the port address
2149 * @addrlen: size of the address
2150 *
2151 * Records the label bound to a port.
2152 *
2153 * Returns 0
2154 */
2155static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2156 int addrlen)
2157{
2158 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2159 smk_ipv6_port_label(sock, address);
2160
2161 return 0;
2162}
2163
2164/**
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002165 * smack_socket_connect - connect access check
2166 * @sock: the socket
2167 * @sap: the other end
2168 * @addrlen: size of sap
2169 *
2170 * Verifies that a connection may be possible
2171 *
2172 * Returns 0 on success, and error code otherwise
2173 */
2174static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2175 int addrlen)
2176{
Casey Schauflerc6739442013-05-22 18:42:56 -07002177 int rc = 0;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002178
Casey Schauflerc6739442013-05-22 18:42:56 -07002179 if (sock->sk == NULL)
2180 return 0;
2181
2182 switch (sock->sk->sk_family) {
2183 case PF_INET:
2184 if (addrlen < sizeof(struct sockaddr_in))
2185 return -EINVAL;
2186 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2187 break;
2188 case PF_INET6:
2189 if (addrlen < sizeof(struct sockaddr_in6))
2190 return -EINVAL;
Casey Schaufler6ea06242013-08-05 13:21:22 -07002191 rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap,
2192 SMK_CONNECTING);
Casey Schauflerc6739442013-05-22 18:42:56 -07002193 break;
2194 }
2195 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08002196}
2197
2198/**
2199 * smack_flags_to_may - convert S_ to MAY_ values
2200 * @flags: the S_ value
2201 *
2202 * Returns the equivalent MAY_ value
2203 */
2204static int smack_flags_to_may(int flags)
2205{
2206 int may = 0;
2207
2208 if (flags & S_IRUGO)
2209 may |= MAY_READ;
2210 if (flags & S_IWUGO)
2211 may |= MAY_WRITE;
2212 if (flags & S_IXUGO)
2213 may |= MAY_EXEC;
2214
2215 return may;
2216}
2217
2218/**
2219 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2220 * @msg: the object
2221 *
2222 * Returns 0
2223 */
2224static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2225{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002226 struct smack_known *skp = smk_of_current();
2227
2228 msg->security = skp->smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08002229 return 0;
2230}
2231
2232/**
2233 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2234 * @msg: the object
2235 *
2236 * Clears the blob pointer
2237 */
2238static void smack_msg_msg_free_security(struct msg_msg *msg)
2239{
2240 msg->security = NULL;
2241}
2242
2243/**
2244 * smack_of_shm - the smack pointer for the shm
2245 * @shp: the object
2246 *
2247 * Returns a pointer to the smack value
2248 */
2249static char *smack_of_shm(struct shmid_kernel *shp)
2250{
2251 return (char *)shp->shm_perm.security;
2252}
2253
2254/**
2255 * smack_shm_alloc_security - Set the security blob for shm
2256 * @shp: the object
2257 *
2258 * Returns 0
2259 */
2260static int smack_shm_alloc_security(struct shmid_kernel *shp)
2261{
2262 struct kern_ipc_perm *isp = &shp->shm_perm;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002263 struct smack_known *skp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002264
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002265 isp->security = skp->smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08002266 return 0;
2267}
2268
2269/**
2270 * smack_shm_free_security - Clear the security blob for shm
2271 * @shp: the object
2272 *
2273 * Clears the blob pointer
2274 */
2275static void smack_shm_free_security(struct shmid_kernel *shp)
2276{
2277 struct kern_ipc_perm *isp = &shp->shm_perm;
2278
2279 isp->security = NULL;
2280}
2281
2282/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02002283 * smk_curacc_shm : check if current has access on shm
2284 * @shp : the object
2285 * @access : access requested
2286 *
2287 * Returns 0 if current has the requested access, error code otherwise
2288 */
2289static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2290{
2291 char *ssp = smack_of_shm(shp);
2292 struct smk_audit_info ad;
2293
2294#ifdef CONFIG_AUDIT
2295 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2296 ad.a.u.ipc_id = shp->shm_perm.id;
2297#endif
2298 return smk_curacc(ssp, access, &ad);
2299}
2300
2301/**
Casey Schauflere114e472008-02-04 22:29:50 -08002302 * smack_shm_associate - Smack access check for shm
2303 * @shp: the object
2304 * @shmflg: access requested
2305 *
2306 * Returns 0 if current has the requested access, error code otherwise
2307 */
2308static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2309{
Casey Schauflere114e472008-02-04 22:29:50 -08002310 int may;
2311
2312 may = smack_flags_to_may(shmflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002313 return smk_curacc_shm(shp, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002314}
2315
2316/**
2317 * smack_shm_shmctl - Smack access check for shm
2318 * @shp: the object
2319 * @cmd: what it wants to do
2320 *
2321 * Returns 0 if current has the requested access, error code otherwise
2322 */
2323static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2324{
Casey Schauflere114e472008-02-04 22:29:50 -08002325 int may;
2326
2327 switch (cmd) {
2328 case IPC_STAT:
2329 case SHM_STAT:
2330 may = MAY_READ;
2331 break;
2332 case IPC_SET:
2333 case SHM_LOCK:
2334 case SHM_UNLOCK:
2335 case IPC_RMID:
2336 may = MAY_READWRITE;
2337 break;
2338 case IPC_INFO:
2339 case SHM_INFO:
2340 /*
2341 * System level information.
2342 */
2343 return 0;
2344 default:
2345 return -EINVAL;
2346 }
Etienne Bassetecfcc532009-04-08 20:40:06 +02002347 return smk_curacc_shm(shp, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002348}
2349
2350/**
2351 * smack_shm_shmat - Smack access for shmat
2352 * @shp: the object
2353 * @shmaddr: unused
2354 * @shmflg: access requested
2355 *
2356 * Returns 0 if current has the requested access, error code otherwise
2357 */
2358static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2359 int shmflg)
2360{
Casey Schauflere114e472008-02-04 22:29:50 -08002361 int may;
2362
2363 may = smack_flags_to_may(shmflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002364 return smk_curacc_shm(shp, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002365}
2366
2367/**
2368 * smack_of_sem - the smack pointer for the sem
2369 * @sma: the object
2370 *
2371 * Returns a pointer to the smack value
2372 */
2373static char *smack_of_sem(struct sem_array *sma)
2374{
2375 return (char *)sma->sem_perm.security;
2376}
2377
2378/**
2379 * smack_sem_alloc_security - Set the security blob for sem
2380 * @sma: the object
2381 *
2382 * Returns 0
2383 */
2384static int smack_sem_alloc_security(struct sem_array *sma)
2385{
2386 struct kern_ipc_perm *isp = &sma->sem_perm;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002387 struct smack_known *skp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002388
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002389 isp->security = skp->smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08002390 return 0;
2391}
2392
2393/**
2394 * smack_sem_free_security - Clear the security blob for sem
2395 * @sma: the object
2396 *
2397 * Clears the blob pointer
2398 */
2399static void smack_sem_free_security(struct sem_array *sma)
2400{
2401 struct kern_ipc_perm *isp = &sma->sem_perm;
2402
2403 isp->security = NULL;
2404}
2405
2406/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02002407 * smk_curacc_sem : check if current has access on sem
2408 * @sma : the object
2409 * @access : access requested
2410 *
2411 * Returns 0 if current has the requested access, error code otherwise
2412 */
2413static int smk_curacc_sem(struct sem_array *sma, int access)
2414{
2415 char *ssp = smack_of_sem(sma);
2416 struct smk_audit_info ad;
2417
2418#ifdef CONFIG_AUDIT
2419 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2420 ad.a.u.ipc_id = sma->sem_perm.id;
2421#endif
2422 return smk_curacc(ssp, access, &ad);
2423}
2424
2425/**
Casey Schauflere114e472008-02-04 22:29:50 -08002426 * smack_sem_associate - Smack access check for sem
2427 * @sma: the object
2428 * @semflg: access requested
2429 *
2430 * Returns 0 if current has the requested access, error code otherwise
2431 */
2432static int smack_sem_associate(struct sem_array *sma, int semflg)
2433{
Casey Schauflere114e472008-02-04 22:29:50 -08002434 int may;
2435
2436 may = smack_flags_to_may(semflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002437 return smk_curacc_sem(sma, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002438}
2439
2440/**
2441 * smack_sem_shmctl - Smack access check for sem
2442 * @sma: the object
2443 * @cmd: what it wants to do
2444 *
2445 * Returns 0 if current has the requested access, error code otherwise
2446 */
2447static int smack_sem_semctl(struct sem_array *sma, int cmd)
2448{
Casey Schauflere114e472008-02-04 22:29:50 -08002449 int may;
2450
2451 switch (cmd) {
2452 case GETPID:
2453 case GETNCNT:
2454 case GETZCNT:
2455 case GETVAL:
2456 case GETALL:
2457 case IPC_STAT:
2458 case SEM_STAT:
2459 may = MAY_READ;
2460 break;
2461 case SETVAL:
2462 case SETALL:
2463 case IPC_RMID:
2464 case IPC_SET:
2465 may = MAY_READWRITE;
2466 break;
2467 case IPC_INFO:
2468 case SEM_INFO:
2469 /*
2470 * System level information
2471 */
2472 return 0;
2473 default:
2474 return -EINVAL;
2475 }
2476
Etienne Bassetecfcc532009-04-08 20:40:06 +02002477 return smk_curacc_sem(sma, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002478}
2479
2480/**
2481 * smack_sem_semop - Smack checks of semaphore operations
2482 * @sma: the object
2483 * @sops: unused
2484 * @nsops: unused
2485 * @alter: unused
2486 *
2487 * Treated as read and write in all cases.
2488 *
2489 * Returns 0 if access is allowed, error code otherwise
2490 */
2491static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2492 unsigned nsops, int alter)
2493{
Etienne Bassetecfcc532009-04-08 20:40:06 +02002494 return smk_curacc_sem(sma, MAY_READWRITE);
Casey Schauflere114e472008-02-04 22:29:50 -08002495}
2496
2497/**
2498 * smack_msg_alloc_security - Set the security blob for msg
2499 * @msq: the object
2500 *
2501 * Returns 0
2502 */
2503static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2504{
2505 struct kern_ipc_perm *kisp = &msq->q_perm;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002506 struct smack_known *skp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002507
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002508 kisp->security = skp->smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08002509 return 0;
2510}
2511
2512/**
2513 * smack_msg_free_security - Clear the security blob for msg
2514 * @msq: the object
2515 *
2516 * Clears the blob pointer
2517 */
2518static void smack_msg_queue_free_security(struct msg_queue *msq)
2519{
2520 struct kern_ipc_perm *kisp = &msq->q_perm;
2521
2522 kisp->security = NULL;
2523}
2524
2525/**
2526 * smack_of_msq - the smack pointer for the msq
2527 * @msq: the object
2528 *
2529 * Returns a pointer to the smack value
2530 */
2531static char *smack_of_msq(struct msg_queue *msq)
2532{
2533 return (char *)msq->q_perm.security;
2534}
2535
2536/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02002537 * smk_curacc_msq : helper to check if current has access on msq
2538 * @msq : the msq
2539 * @access : access requested
2540 *
2541 * return 0 if current has access, error otherwise
2542 */
2543static int smk_curacc_msq(struct msg_queue *msq, int access)
2544{
2545 char *msp = smack_of_msq(msq);
2546 struct smk_audit_info ad;
2547
2548#ifdef CONFIG_AUDIT
2549 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2550 ad.a.u.ipc_id = msq->q_perm.id;
2551#endif
2552 return smk_curacc(msp, access, &ad);
2553}
2554
2555/**
Casey Schauflere114e472008-02-04 22:29:50 -08002556 * smack_msg_queue_associate - Smack access check for msg_queue
2557 * @msq: the object
2558 * @msqflg: access requested
2559 *
2560 * Returns 0 if current has the requested access, error code otherwise
2561 */
2562static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2563{
Casey Schauflere114e472008-02-04 22:29:50 -08002564 int may;
2565
2566 may = smack_flags_to_may(msqflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002567 return smk_curacc_msq(msq, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002568}
2569
2570/**
2571 * smack_msg_queue_msgctl - Smack access check for msg_queue
2572 * @msq: the object
2573 * @cmd: what it wants to do
2574 *
2575 * Returns 0 if current has the requested access, error code otherwise
2576 */
2577static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2578{
Casey Schauflere114e472008-02-04 22:29:50 -08002579 int may;
2580
2581 switch (cmd) {
2582 case IPC_STAT:
2583 case MSG_STAT:
2584 may = MAY_READ;
2585 break;
2586 case IPC_SET:
2587 case IPC_RMID:
2588 may = MAY_READWRITE;
2589 break;
2590 case IPC_INFO:
2591 case MSG_INFO:
2592 /*
2593 * System level information
2594 */
2595 return 0;
2596 default:
2597 return -EINVAL;
2598 }
2599
Etienne Bassetecfcc532009-04-08 20:40:06 +02002600 return smk_curacc_msq(msq, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002601}
2602
2603/**
2604 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2605 * @msq: the object
2606 * @msg: unused
2607 * @msqflg: access requested
2608 *
2609 * Returns 0 if current has the requested access, error code otherwise
2610 */
2611static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2612 int msqflg)
2613{
Etienne Bassetecfcc532009-04-08 20:40:06 +02002614 int may;
Casey Schauflere114e472008-02-04 22:29:50 -08002615
Etienne Bassetecfcc532009-04-08 20:40:06 +02002616 may = smack_flags_to_may(msqflg);
2617 return smk_curacc_msq(msq, may);
Casey Schauflere114e472008-02-04 22:29:50 -08002618}
2619
2620/**
2621 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2622 * @msq: the object
2623 * @msg: unused
2624 * @target: unused
2625 * @type: unused
2626 * @mode: unused
2627 *
2628 * Returns 0 if current has read and write access, error code otherwise
2629 */
2630static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2631 struct task_struct *target, long type, int mode)
2632{
Etienne Bassetecfcc532009-04-08 20:40:06 +02002633 return smk_curacc_msq(msq, MAY_READWRITE);
Casey Schauflere114e472008-02-04 22:29:50 -08002634}
2635
2636/**
2637 * smack_ipc_permission - Smack access for ipc_permission()
2638 * @ipp: the object permissions
2639 * @flag: access requested
2640 *
2641 * Returns 0 if current has read and write access, error code otherwise
2642 */
2643static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2644{
2645 char *isp = ipp->security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002646 int may = smack_flags_to_may(flag);
2647 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -08002648
Etienne Bassetecfcc532009-04-08 20:40:06 +02002649#ifdef CONFIG_AUDIT
2650 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2651 ad.a.u.ipc_id = ipp->id;
2652#endif
2653 return smk_curacc(isp, may, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08002654}
2655
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10002656/**
2657 * smack_ipc_getsecid - Extract smack security id
Randy Dunlap251a2a92009-02-18 11:42:33 -08002658 * @ipp: the object permissions
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10002659 * @secid: where result will be saved
2660 */
2661static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2662{
2663 char *smack = ipp->security;
2664
2665 *secid = smack_to_secid(smack);
2666}
2667
Casey Schauflere114e472008-02-04 22:29:50 -08002668/**
2669 * smack_d_instantiate - Make sure the blob is correct on an inode
Dan Carpenter3e62cbb2010-06-01 09:14:04 +02002670 * @opt_dentry: dentry where inode will be attached
Casey Schauflere114e472008-02-04 22:29:50 -08002671 * @inode: the object
2672 *
2673 * Set the inode's security blob if it hasn't been done already.
2674 */
2675static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2676{
2677 struct super_block *sbp;
2678 struct superblock_smack *sbsp;
2679 struct inode_smack *isp;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002680 struct smack_known *skp;
2681 struct smack_known *ckp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002682 char *final;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002683 char trattr[TRANS_TRUE_SIZE];
2684 int transflag = 0;
Casey Schaufler2267b132012-03-13 19:14:19 -07002685 int rc;
Casey Schauflere114e472008-02-04 22:29:50 -08002686 struct dentry *dp;
2687
2688 if (inode == NULL)
2689 return;
2690
2691 isp = inode->i_security;
2692
2693 mutex_lock(&isp->smk_lock);
2694 /*
2695 * If the inode is already instantiated
2696 * take the quick way out
2697 */
2698 if (isp->smk_flags & SMK_INODE_INSTANT)
2699 goto unlockandout;
2700
2701 sbp = inode->i_sb;
2702 sbsp = sbp->s_security;
2703 /*
2704 * We're going to use the superblock default label
2705 * if there's no label on the file.
2706 */
2707 final = sbsp->smk_default;
2708
2709 /*
Casey Schauflere97dcb02008-06-02 10:04:32 -07002710 * If this is the root inode the superblock
2711 * may be in the process of initialization.
2712 * If that is the case use the root value out
2713 * of the superblock.
2714 */
2715 if (opt_dentry->d_parent == opt_dentry) {
2716 isp->smk_inode = sbsp->smk_root;
2717 isp->smk_flags |= SMK_INODE_INSTANT;
2718 goto unlockandout;
2719 }
2720
2721 /*
Casey Schauflere114e472008-02-04 22:29:50 -08002722 * This is pretty hackish.
2723 * Casey says that we shouldn't have to do
2724 * file system specific code, but it does help
2725 * with keeping it simple.
2726 */
2727 switch (sbp->s_magic) {
2728 case SMACK_MAGIC:
2729 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002730 * Casey says that it's a little embarrassing
Casey Schauflere114e472008-02-04 22:29:50 -08002731 * that the smack file system doesn't do
2732 * extended attributes.
2733 */
2734 final = smack_known_star.smk_known;
2735 break;
2736 case PIPEFS_MAGIC:
2737 /*
2738 * Casey says pipes are easy (?)
2739 */
2740 final = smack_known_star.smk_known;
2741 break;
2742 case DEVPTS_SUPER_MAGIC:
2743 /*
2744 * devpts seems content with the label of the task.
2745 * Programs that change smack have to treat the
2746 * pty with respect.
2747 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002748 final = ckp->smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08002749 break;
2750 case SOCKFS_MAGIC:
2751 /*
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002752 * Socket access is controlled by the socket
2753 * structures associated with the task involved.
Casey Schauflere114e472008-02-04 22:29:50 -08002754 */
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002755 final = smack_known_star.smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08002756 break;
2757 case PROC_SUPER_MAGIC:
2758 /*
2759 * Casey says procfs appears not to care.
2760 * The superblock default suffices.
2761 */
2762 break;
2763 case TMPFS_MAGIC:
2764 /*
2765 * Device labels should come from the filesystem,
2766 * but watch out, because they're volitile,
2767 * getting recreated on every reboot.
2768 */
2769 final = smack_known_star.smk_known;
2770 /*
2771 * No break.
2772 *
2773 * If a smack value has been set we want to use it,
2774 * but since tmpfs isn't giving us the opportunity
2775 * to set mount options simulate setting the
2776 * superblock default.
2777 */
2778 default:
2779 /*
2780 * This isn't an understood special case.
2781 * Get the value from the xattr.
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002782 */
2783
2784 /*
2785 * UNIX domain sockets use lower level socket data.
2786 */
2787 if (S_ISSOCK(inode->i_mode)) {
2788 final = smack_known_star.smk_known;
2789 break;
2790 }
2791 /*
Casey Schauflere114e472008-02-04 22:29:50 -08002792 * No xattr support means, alas, no SMACK label.
2793 * Use the aforeapplied default.
2794 * It would be curious if the label of the task
2795 * does not match that assigned.
2796 */
2797 if (inode->i_op->getxattr == NULL)
2798 break;
2799 /*
2800 * Get the dentry for xattr.
2801 */
Dan Carpenter3e62cbb2010-06-01 09:14:04 +02002802 dp = dget(opt_dentry);
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002803 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
2804 if (skp != NULL)
2805 final = skp->smk_known;
Casey Schaufler2267b132012-03-13 19:14:19 -07002806
2807 /*
2808 * Transmuting directory
2809 */
2810 if (S_ISDIR(inode->i_mode)) {
2811 /*
2812 * If this is a new directory and the label was
2813 * transmuted when the inode was initialized
2814 * set the transmute attribute on the directory
2815 * and mark the inode.
2816 *
2817 * If there is a transmute attribute on the
2818 * directory mark the inode.
2819 */
2820 if (isp->smk_flags & SMK_INODE_CHANGED) {
2821 isp->smk_flags &= ~SMK_INODE_CHANGED;
2822 rc = inode->i_op->setxattr(dp,
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002823 XATTR_NAME_SMACKTRANSMUTE,
Casey Schaufler2267b132012-03-13 19:14:19 -07002824 TRANS_TRUE, TRANS_TRUE_SIZE,
2825 0);
2826 } else {
2827 rc = inode->i_op->getxattr(dp,
2828 XATTR_NAME_SMACKTRANSMUTE, trattr,
2829 TRANS_TRUE_SIZE);
2830 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
2831 TRANS_TRUE_SIZE) != 0)
2832 rc = -EINVAL;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002833 }
Casey Schaufler2267b132012-03-13 19:14:19 -07002834 if (rc >= 0)
2835 transflag = SMK_INODE_TRANSMUTE;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002836 }
Casey Schaufler19760ad2013-12-16 16:27:26 -08002837 /*
2838 * Don't let the exec or mmap label be "*" or "@".
2839 */
2840 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
2841 if (skp == &smack_known_star || skp == &smack_known_web)
2842 skp = NULL;
2843 isp->smk_task = skp;
2844 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
2845 if (skp == &smack_known_star || skp == &smack_known_web)
2846 skp = NULL;
2847 isp->smk_mmap = skp;
Casey Schaufler676dac42010-12-02 06:43:39 -08002848
Casey Schauflere114e472008-02-04 22:29:50 -08002849 dput(dp);
2850 break;
2851 }
2852
2853 if (final == NULL)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002854 isp->smk_inode = ckp->smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08002855 else
2856 isp->smk_inode = final;
2857
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02002858 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
Casey Schauflere114e472008-02-04 22:29:50 -08002859
2860unlockandout:
2861 mutex_unlock(&isp->smk_lock);
2862 return;
2863}
2864
2865/**
2866 * smack_getprocattr - Smack process attribute access
2867 * @p: the object task
2868 * @name: the name of the attribute in /proc/.../attr
2869 * @value: where to put the result
2870 *
2871 * Places a copy of the task Smack into value
2872 *
2873 * Returns the length of the smack label or an error code
2874 */
2875static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2876{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002877 struct smack_known *skp = smk_of_task(task_security(p));
Casey Schauflere114e472008-02-04 22:29:50 -08002878 char *cp;
2879 int slen;
2880
2881 if (strcmp(name, "current") != 0)
2882 return -EINVAL;
2883
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002884 cp = kstrdup(skp->smk_known, GFP_KERNEL);
Casey Schauflere114e472008-02-04 22:29:50 -08002885 if (cp == NULL)
2886 return -ENOMEM;
2887
2888 slen = strlen(cp);
2889 *value = cp;
2890 return slen;
2891}
2892
2893/**
2894 * smack_setprocattr - Smack process attribute setting
2895 * @p: the object task
2896 * @name: the name of the attribute in /proc/.../attr
2897 * @value: the value to set
2898 * @size: the size of the value
2899 *
2900 * Sets the Smack value of the task. Only setting self
2901 * is permitted and only with privilege
2902 *
2903 * Returns the length of the smack label or an error code
2904 */
2905static int smack_setprocattr(struct task_struct *p, char *name,
2906 void *value, size_t size)
2907{
Casey Schaufler676dac42010-12-02 06:43:39 -08002908 struct task_smack *tsp;
David Howellsd84f4f92008-11-14 10:39:23 +11002909 struct cred *new;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002910 struct smack_known *skp;
Casey Schauflere114e472008-02-04 22:29:50 -08002911
Casey Schauflere114e472008-02-04 22:29:50 -08002912 /*
2913 * Changing another process' Smack value is too dangerous
2914 * and supports no sane use case.
2915 */
2916 if (p != current)
2917 return -EPERM;
2918
Casey Schaufler1880eff2012-06-05 15:28:30 -07002919 if (!smack_privileged(CAP_MAC_ADMIN))
David Howells5cd9c582008-08-14 11:37:28 +01002920 return -EPERM;
2921
Casey Schauflerf7112e62012-05-06 15:22:02 -07002922 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
Casey Schauflere114e472008-02-04 22:29:50 -08002923 return -EINVAL;
2924
2925 if (strcmp(name, "current") != 0)
2926 return -EINVAL;
2927
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002928 skp = smk_import_entry(value, size);
2929 if (skp == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08002930 return -EINVAL;
2931
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002932 /*
2933 * No process is ever allowed the web ("@") label.
2934 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002935 if (skp == &smack_known_web)
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002936 return -EPERM;
2937
David Howellsd84f4f92008-11-14 10:39:23 +11002938 new = prepare_creds();
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002939 if (new == NULL)
David Howellsd84f4f92008-11-14 10:39:23 +11002940 return -ENOMEM;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002941
Casey Schaufler46a2f3b2012-08-22 11:44:03 -07002942 tsp = new->security;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002943 tsp->smk_task = skp;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002944
David Howellsd84f4f92008-11-14 10:39:23 +11002945 commit_creds(new);
Casey Schauflere114e472008-02-04 22:29:50 -08002946 return size;
2947}
2948
2949/**
2950 * smack_unix_stream_connect - Smack access on UDS
David S. Miller3610cda2011-01-05 15:38:53 -08002951 * @sock: one sock
2952 * @other: the other sock
Casey Schauflere114e472008-02-04 22:29:50 -08002953 * @newsk: unused
2954 *
2955 * Return 0 if a subject with the smack of sock could access
2956 * an object with the smack of other, otherwise an error code
2957 */
David S. Miller3610cda2011-01-05 15:38:53 -08002958static int smack_unix_stream_connect(struct sock *sock,
2959 struct sock *other, struct sock *newsk)
Casey Schauflere114e472008-02-04 22:29:50 -08002960{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002961 struct smack_known *skp;
James Morrisd2e7ad12011-01-10 09:46:24 +11002962 struct socket_smack *ssp = sock->sk_security;
2963 struct socket_smack *osp = other->sk_security;
Casey Schaufler975d5e52011-09-26 14:43:39 -07002964 struct socket_smack *nsp = newsk->sk_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002965 struct smk_audit_info ad;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002966 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08002967
Kees Cook923e9a12012-04-10 13:26:44 -07002968#ifdef CONFIG_AUDIT
2969 struct lsm_network_audit net;
2970
Eric Paris48c62af2012-04-02 13:15:44 -04002971 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
David S. Miller3610cda2011-01-05 15:38:53 -08002972 smk_ad_setfield_u_net_sk(&ad, other);
Kees Cook923e9a12012-04-10 13:26:44 -07002973#endif
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002974
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002975 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
2976 skp = ssp->smk_out;
2977 rc = smk_access(skp, osp->smk_in, MAY_WRITE, &ad);
2978 }
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002979
Casey Schaufler975d5e52011-09-26 14:43:39 -07002980 /*
2981 * Cross reference the peer labels for SO_PEERSEC.
2982 */
2983 if (rc == 0) {
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002984 nsp->smk_packet = ssp->smk_out->smk_known;
2985 ssp->smk_packet = osp->smk_out->smk_known;
Casey Schaufler975d5e52011-09-26 14:43:39 -07002986 }
2987
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002988 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08002989}
2990
2991/**
2992 * smack_unix_may_send - Smack access on UDS
2993 * @sock: one socket
2994 * @other: the other socket
2995 *
2996 * Return 0 if a subject with the smack of sock could access
2997 * an object with the smack of other, otherwise an error code
2998 */
2999static int smack_unix_may_send(struct socket *sock, struct socket *other)
3000{
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003001 struct socket_smack *ssp = sock->sk->sk_security;
3002 struct socket_smack *osp = other->sk->sk_security;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003003 struct smack_known *skp;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003004 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -08003005
Kees Cook923e9a12012-04-10 13:26:44 -07003006#ifdef CONFIG_AUDIT
3007 struct lsm_network_audit net;
3008
Eric Paris48c62af2012-04-02 13:15:44 -04003009 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
Etienne Bassetecfcc532009-04-08 20:40:06 +02003010 smk_ad_setfield_u_net_sk(&ad, other->sk);
Kees Cook923e9a12012-04-10 13:26:44 -07003011#endif
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003012
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003013 if (smack_privileged(CAP_MAC_OVERRIDE))
3014 return 0;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003015
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003016 skp = ssp->smk_out;
3017 return smk_access(skp, osp->smk_in, MAY_WRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08003018}
3019
3020/**
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003021 * smack_socket_sendmsg - Smack check based on destination host
3022 * @sock: the socket
Randy Dunlap251a2a92009-02-18 11:42:33 -08003023 * @msg: the message
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003024 * @size: the size of the message
3025 *
Casey Schauflerc6739442013-05-22 18:42:56 -07003026 * Return 0 if the current subject can write to the destination host.
3027 * For IPv4 this is only a question if the destination is a single label host.
3028 * For IPv6 this is a check against the label of the port.
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003029 */
3030static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3031 int size)
3032{
3033 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
Casey Schaufler6ea06242013-08-05 13:21:22 -07003034 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
Casey Schauflerc6739442013-05-22 18:42:56 -07003035 int rc = 0;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003036
3037 /*
3038 * Perfectly reasonable for this to be NULL
3039 */
Casey Schauflerc6739442013-05-22 18:42:56 -07003040 if (sip == NULL)
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003041 return 0;
3042
Casey Schauflerc6739442013-05-22 18:42:56 -07003043 switch (sip->sin_family) {
3044 case AF_INET:
3045 rc = smack_netlabel_send(sock->sk, sip);
3046 break;
3047 case AF_INET6:
3048 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3049 break;
3050 }
3051 return rc;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003052}
3053
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003054/**
Randy Dunlap251a2a92009-02-18 11:42:33 -08003055 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
Casey Schauflere114e472008-02-04 22:29:50 -08003056 * @sap: netlabel secattr
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003057 * @ssp: socket security information
Casey Schauflere114e472008-02-04 22:29:50 -08003058 *
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003059 * Returns a pointer to a Smack label entry found on the label list.
Casey Schauflere114e472008-02-04 22:29:50 -08003060 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003061static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3062 struct socket_smack *ssp)
Casey Schauflere114e472008-02-04 22:29:50 -08003063{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003064 struct smack_known *skp;
Casey Schauflerf7112e62012-05-06 15:22:02 -07003065 int found = 0;
Casey Schaufler677264e2013-06-28 13:47:07 -07003066 int acat;
3067 int kcat;
Casey Schauflere114e472008-02-04 22:29:50 -08003068
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003069 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
Casey Schauflere114e472008-02-04 22:29:50 -08003070 /*
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003071 * Looks like a CIPSO packet.
Casey Schauflere114e472008-02-04 22:29:50 -08003072 * If there are flags but no level netlabel isn't
3073 * behaving the way we expect it to.
3074 *
Casey Schauflerf7112e62012-05-06 15:22:02 -07003075 * Look it up in the label table
Casey Schauflere114e472008-02-04 22:29:50 -08003076 * Without guidance regarding the smack value
3077 * for the packet fall back on the network
3078 * ambient value.
3079 */
Casey Schauflerf7112e62012-05-06 15:22:02 -07003080 rcu_read_lock();
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003081 list_for_each_entry(skp, &smack_known_list, list) {
3082 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
Casey Schauflerf7112e62012-05-06 15:22:02 -07003083 continue;
Casey Schaufler677264e2013-06-28 13:47:07 -07003084 /*
3085 * Compare the catsets. Use the netlbl APIs.
3086 */
3087 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3088 if ((skp->smk_netlabel.flags &
3089 NETLBL_SECATTR_MLS_CAT) == 0)
3090 found = 1;
3091 break;
3092 }
3093 for (acat = -1, kcat = -1; acat == kcat; ) {
3094 acat = netlbl_secattr_catmap_walk(
3095 sap->attr.mls.cat, acat + 1);
3096 kcat = netlbl_secattr_catmap_walk(
3097 skp->smk_netlabel.attr.mls.cat,
3098 kcat + 1);
3099 if (acat < 0 || kcat < 0)
3100 break;
3101 }
3102 if (acat == kcat) {
3103 found = 1;
3104 break;
3105 }
Casey Schauflere114e472008-02-04 22:29:50 -08003106 }
Casey Schauflerf7112e62012-05-06 15:22:02 -07003107 rcu_read_unlock();
3108
3109 if (found)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003110 return skp;
Casey Schauflerf7112e62012-05-06 15:22:02 -07003111
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003112 if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003113 return &smack_known_web;
3114 return &smack_known_star;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003115 }
3116 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
3117 /*
3118 * Looks like a fallback, which gives us a secid.
3119 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003120 skp = smack_from_secid(sap->attr.secid);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003121 /*
3122 * This has got to be a bug because it is
3123 * impossible to specify a fallback without
3124 * specifying the label, which will ensure
3125 * it has a secid, and the only way to get a
3126 * secid is from a fallback.
3127 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003128 BUG_ON(skp == NULL);
3129 return skp;
Casey Schauflere114e472008-02-04 22:29:50 -08003130 }
3131 /*
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003132 * Without guidance regarding the smack value
3133 * for the packet fall back on the network
3134 * ambient value.
Casey Schauflere114e472008-02-04 22:29:50 -08003135 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003136 return smack_net_ambient;
Casey Schauflere114e472008-02-04 22:29:50 -08003137}
3138
Casey Schaufler6ea06242013-08-05 13:21:22 -07003139static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
Casey Schauflerc6739442013-05-22 18:42:56 -07003140{
Casey Schauflerc6739442013-05-22 18:42:56 -07003141 u8 nexthdr;
3142 int offset;
3143 int proto = -EINVAL;
3144 struct ipv6hdr _ipv6h;
3145 struct ipv6hdr *ip6;
3146 __be16 frag_off;
3147 struct tcphdr _tcph, *th;
3148 struct udphdr _udph, *uh;
3149 struct dccp_hdr _dccph, *dh;
3150
3151 sip->sin6_port = 0;
3152
3153 offset = skb_network_offset(skb);
3154 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3155 if (ip6 == NULL)
3156 return -EINVAL;
3157 sip->sin6_addr = ip6->saddr;
3158
3159 nexthdr = ip6->nexthdr;
3160 offset += sizeof(_ipv6h);
3161 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3162 if (offset < 0)
3163 return -EINVAL;
3164
3165 proto = nexthdr;
3166 switch (proto) {
3167 case IPPROTO_TCP:
3168 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3169 if (th != NULL)
3170 sip->sin6_port = th->source;
3171 break;
3172 case IPPROTO_UDP:
3173 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3174 if (uh != NULL)
3175 sip->sin6_port = uh->source;
3176 break;
3177 case IPPROTO_DCCP:
3178 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3179 if (dh != NULL)
3180 sip->sin6_port = dh->dccph_sport;
3181 break;
3182 }
3183 return proto;
3184}
3185
Casey Schauflere114e472008-02-04 22:29:50 -08003186/**
3187 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3188 * @sk: socket
3189 * @skb: packet
3190 *
3191 * Returns 0 if the packet should be delivered, an error code otherwise
3192 */
3193static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3194{
3195 struct netlbl_lsm_secattr secattr;
3196 struct socket_smack *ssp = sk->sk_security;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003197 struct smack_known *skp;
Casey Schaufler6ea06242013-08-05 13:21:22 -07003198 struct sockaddr_in6 sadd;
Casey Schauflerc6739442013-05-22 18:42:56 -07003199 int rc = 0;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003200 struct smk_audit_info ad;
Kees Cook923e9a12012-04-10 13:26:44 -07003201#ifdef CONFIG_AUDIT
Eric Paris48c62af2012-04-02 13:15:44 -04003202 struct lsm_network_audit net;
Kees Cook923e9a12012-04-10 13:26:44 -07003203#endif
Casey Schauflerc6739442013-05-22 18:42:56 -07003204 switch (sk->sk_family) {
3205 case PF_INET:
3206 /*
3207 * Translate what netlabel gave us.
3208 */
3209 netlbl_secattr_init(&secattr);
Casey Schauflere114e472008-02-04 22:29:50 -08003210
Casey Schauflerc6739442013-05-22 18:42:56 -07003211 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
3212 if (rc == 0)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003213 skp = smack_from_secattr(&secattr, ssp);
Casey Schauflerc6739442013-05-22 18:42:56 -07003214 else
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003215 skp = smack_net_ambient;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003216
Casey Schauflerc6739442013-05-22 18:42:56 -07003217 netlbl_secattr_destroy(&secattr);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003218
Etienne Bassetecfcc532009-04-08 20:40:06 +02003219#ifdef CONFIG_AUDIT
Casey Schauflerc6739442013-05-22 18:42:56 -07003220 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3221 ad.a.u.net->family = sk->sk_family;
3222 ad.a.u.net->netif = skb->skb_iif;
3223 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
Etienne Bassetecfcc532009-04-08 20:40:06 +02003224#endif
Casey Schauflerc6739442013-05-22 18:42:56 -07003225 /*
3226 * Receiving a packet requires that the other end
3227 * be able to write here. Read access is not required.
3228 * This is the simplist possible security model
3229 * for networking.
3230 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003231 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
Casey Schauflerc6739442013-05-22 18:42:56 -07003232 if (rc != 0)
3233 netlbl_skbuff_err(skb, rc, 0);
3234 break;
3235 case PF_INET6:
3236 rc = smk_skb_to_addr_ipv6(skb, &sadd);
3237 if (rc == IPPROTO_UDP || rc == IPPROTO_TCP)
3238 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
3239 else
3240 rc = 0;
3241 break;
3242 }
Paul Moorea8134292008-10-10 10:16:31 -04003243 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08003244}
3245
3246/**
3247 * smack_socket_getpeersec_stream - pull in packet label
3248 * @sock: the socket
3249 * @optval: user's destination
3250 * @optlen: size thereof
Randy Dunlap251a2a92009-02-18 11:42:33 -08003251 * @len: max thereof
Casey Schauflere114e472008-02-04 22:29:50 -08003252 *
3253 * returns zero on success, an error code otherwise
3254 */
3255static int smack_socket_getpeersec_stream(struct socket *sock,
3256 char __user *optval,
3257 int __user *optlen, unsigned len)
3258{
3259 struct socket_smack *ssp;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003260 char *rcp = "";
3261 int slen = 1;
Casey Schauflere114e472008-02-04 22:29:50 -08003262 int rc = 0;
3263
3264 ssp = sock->sk->sk_security;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003265 if (ssp->smk_packet != NULL) {
3266 rcp = ssp->smk_packet;
3267 slen = strlen(rcp) + 1;
3268 }
Casey Schauflere114e472008-02-04 22:29:50 -08003269
3270 if (slen > len)
3271 rc = -ERANGE;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003272 else if (copy_to_user(optval, rcp, slen) != 0)
Casey Schauflere114e472008-02-04 22:29:50 -08003273 rc = -EFAULT;
3274
3275 if (put_user(slen, optlen) != 0)
3276 rc = -EFAULT;
3277
3278 return rc;
3279}
3280
3281
3282/**
3283 * smack_socket_getpeersec_dgram - pull in packet label
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003284 * @sock: the peer socket
Casey Schauflere114e472008-02-04 22:29:50 -08003285 * @skb: packet data
3286 * @secid: pointer to where to put the secid of the packet
3287 *
3288 * Sets the netlabel socket state on sk from parent
3289 */
3290static int smack_socket_getpeersec_dgram(struct socket *sock,
3291 struct sk_buff *skb, u32 *secid)
3292
3293{
3294 struct netlbl_lsm_secattr secattr;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003295 struct socket_smack *ssp = NULL;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003296 struct smack_known *skp;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003297 int family = PF_UNSPEC;
3298 u32 s = 0; /* 0 is the invalid secid */
Casey Schauflere114e472008-02-04 22:29:50 -08003299 int rc;
3300
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003301 if (skb != NULL) {
3302 if (skb->protocol == htons(ETH_P_IP))
3303 family = PF_INET;
3304 else if (skb->protocol == htons(ETH_P_IPV6))
3305 family = PF_INET6;
Casey Schauflere114e472008-02-04 22:29:50 -08003306 }
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003307 if (family == PF_UNSPEC && sock != NULL)
3308 family = sock->sk->sk_family;
Casey Schauflere114e472008-02-04 22:29:50 -08003309
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003310 if (family == PF_UNIX) {
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003311 ssp = sock->sk->sk_security;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003312 s = ssp->smk_out->smk_secid;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003313 } else if (family == PF_INET || family == PF_INET6) {
3314 /*
3315 * Translate what netlabel gave us.
3316 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003317 if (sock != NULL && sock->sk != NULL)
3318 ssp = sock->sk->sk_security;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003319 netlbl_secattr_init(&secattr);
3320 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3321 if (rc == 0) {
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003322 skp = smack_from_secattr(&secattr, ssp);
3323 s = skp->smk_secid;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003324 }
3325 netlbl_secattr_destroy(&secattr);
3326 }
3327 *secid = s;
Casey Schauflere114e472008-02-04 22:29:50 -08003328 if (s == 0)
3329 return -EINVAL;
Casey Schauflere114e472008-02-04 22:29:50 -08003330 return 0;
3331}
3332
3333/**
Paul Moore07feee82009-03-27 17:10:54 -04003334 * smack_sock_graft - Initialize a newly created socket with an existing sock
3335 * @sk: child sock
3336 * @parent: parent socket
Casey Schauflere114e472008-02-04 22:29:50 -08003337 *
Paul Moore07feee82009-03-27 17:10:54 -04003338 * Set the smk_{in,out} state of an existing sock based on the process that
3339 * is creating the new socket.
Casey Schauflere114e472008-02-04 22:29:50 -08003340 */
3341static void smack_sock_graft(struct sock *sk, struct socket *parent)
3342{
3343 struct socket_smack *ssp;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003344 struct smack_known *skp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08003345
Paul Moore07feee82009-03-27 17:10:54 -04003346 if (sk == NULL ||
3347 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
Casey Schauflere114e472008-02-04 22:29:50 -08003348 return;
3349
3350 ssp = sk->sk_security;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003351 ssp->smk_in = skp->smk_known;
3352 ssp->smk_out = skp;
Paul Moore07feee82009-03-27 17:10:54 -04003353 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
Casey Schauflere114e472008-02-04 22:29:50 -08003354}
3355
3356/**
3357 * smack_inet_conn_request - Smack access check on connect
3358 * @sk: socket involved
3359 * @skb: packet
3360 * @req: unused
3361 *
3362 * Returns 0 if a task with the packet label could write to
3363 * the socket, otherwise an error code
3364 */
3365static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3366 struct request_sock *req)
3367{
Paul Moore07feee82009-03-27 17:10:54 -04003368 u16 family = sk->sk_family;
Casey Schauflerf7112e62012-05-06 15:22:02 -07003369 struct smack_known *skp;
Casey Schauflere114e472008-02-04 22:29:50 -08003370 struct socket_smack *ssp = sk->sk_security;
Paul Moore07feee82009-03-27 17:10:54 -04003371 struct netlbl_lsm_secattr secattr;
3372 struct sockaddr_in addr;
3373 struct iphdr *hdr;
Casey Schauflerf7112e62012-05-06 15:22:02 -07003374 char *hsp;
Casey Schauflere114e472008-02-04 22:29:50 -08003375 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003376 struct smk_audit_info ad;
Kees Cook923e9a12012-04-10 13:26:44 -07003377#ifdef CONFIG_AUDIT
Eric Paris48c62af2012-04-02 13:15:44 -04003378 struct lsm_network_audit net;
Kees Cook923e9a12012-04-10 13:26:44 -07003379#endif
Casey Schauflere114e472008-02-04 22:29:50 -08003380
Casey Schauflerc6739442013-05-22 18:42:56 -07003381 if (family == PF_INET6) {
3382 /*
3383 * Handle mapped IPv4 packets arriving
3384 * via IPv6 sockets. Don't set up netlabel
3385 * processing on IPv6.
3386 */
3387 if (skb->protocol == htons(ETH_P_IP))
3388 family = PF_INET;
3389 else
3390 return 0;
3391 }
Casey Schauflere114e472008-02-04 22:29:50 -08003392
Paul Moore07feee82009-03-27 17:10:54 -04003393 netlbl_secattr_init(&secattr);
3394 rc = netlbl_skbuff_getattr(skb, family, &secattr);
Casey Schauflere114e472008-02-04 22:29:50 -08003395 if (rc == 0)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003396 skp = smack_from_secattr(&secattr, ssp);
Casey Schauflere114e472008-02-04 22:29:50 -08003397 else
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003398 skp = &smack_known_huh;
Paul Moore07feee82009-03-27 17:10:54 -04003399 netlbl_secattr_destroy(&secattr);
3400
Etienne Bassetecfcc532009-04-08 20:40:06 +02003401#ifdef CONFIG_AUDIT
Eric Paris48c62af2012-04-02 13:15:44 -04003402 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3403 ad.a.u.net->family = family;
3404 ad.a.u.net->netif = skb->skb_iif;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003405 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3406#endif
Casey Schauflere114e472008-02-04 22:29:50 -08003407 /*
Paul Moore07feee82009-03-27 17:10:54 -04003408 * Receiving a packet requires that the other end be able to write
3409 * here. Read access is not required.
Casey Schauflere114e472008-02-04 22:29:50 -08003410 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003411 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
Paul Moore07feee82009-03-27 17:10:54 -04003412 if (rc != 0)
3413 return rc;
3414
3415 /*
3416 * Save the peer's label in the request_sock so we can later setup
3417 * smk_packet in the child socket so that SO_PEERCRED can report it.
3418 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003419 req->peer_secid = skp->smk_secid;
Paul Moore07feee82009-03-27 17:10:54 -04003420
3421 /*
3422 * We need to decide if we want to label the incoming connection here
3423 * if we do we only need to label the request_sock and the stack will
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003424 * propagate the wire-label to the sock when it is created.
Paul Moore07feee82009-03-27 17:10:54 -04003425 */
3426 hdr = ip_hdr(skb);
3427 addr.sin_addr.s_addr = hdr->saddr;
3428 rcu_read_lock();
Casey Schauflerf7112e62012-05-06 15:22:02 -07003429 hsp = smack_host_label(&addr);
3430 rcu_read_unlock();
3431
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003432 if (hsp == NULL)
Casey Schauflerf7112e62012-05-06 15:22:02 -07003433 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003434 else
Paul Moore07feee82009-03-27 17:10:54 -04003435 netlbl_req_delattr(req);
Casey Schauflere114e472008-02-04 22:29:50 -08003436
3437 return rc;
3438}
3439
Paul Moore07feee82009-03-27 17:10:54 -04003440/**
3441 * smack_inet_csk_clone - Copy the connection information to the new socket
3442 * @sk: the new socket
3443 * @req: the connection's request_sock
3444 *
3445 * Transfer the connection's peer label to the newly created socket.
3446 */
3447static void smack_inet_csk_clone(struct sock *sk,
3448 const struct request_sock *req)
3449{
3450 struct socket_smack *ssp = sk->sk_security;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003451 struct smack_known *skp;
Paul Moore07feee82009-03-27 17:10:54 -04003452
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003453 if (req->peer_secid != 0) {
3454 skp = smack_from_secid(req->peer_secid);
3455 ssp->smk_packet = skp->smk_known;
3456 } else
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003457 ssp->smk_packet = NULL;
Paul Moore07feee82009-03-27 17:10:54 -04003458}
3459
Casey Schauflere114e472008-02-04 22:29:50 -08003460/*
3461 * Key management security hooks
3462 *
3463 * Casey has not tested key support very heavily.
3464 * The permission check is most likely too restrictive.
3465 * If you care about keys please have a look.
3466 */
3467#ifdef CONFIG_KEYS
3468
3469/**
3470 * smack_key_alloc - Set the key security blob
3471 * @key: object
David Howellsd84f4f92008-11-14 10:39:23 +11003472 * @cred: the credentials to use
Casey Schauflere114e472008-02-04 22:29:50 -08003473 * @flags: unused
3474 *
3475 * No allocation required
3476 *
3477 * Returns 0
3478 */
David Howellsd84f4f92008-11-14 10:39:23 +11003479static int smack_key_alloc(struct key *key, const struct cred *cred,
Casey Schauflere114e472008-02-04 22:29:50 -08003480 unsigned long flags)
3481{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003482 struct smack_known *skp = smk_of_task(cred->security);
3483
3484 key->security = skp->smk_known;
Casey Schauflere114e472008-02-04 22:29:50 -08003485 return 0;
3486}
3487
3488/**
3489 * smack_key_free - Clear the key security blob
3490 * @key: the object
3491 *
3492 * Clear the blob pointer
3493 */
3494static void smack_key_free(struct key *key)
3495{
3496 key->security = NULL;
3497}
3498
3499/*
3500 * smack_key_permission - Smack access on a key
3501 * @key_ref: gets to the object
David Howellsd84f4f92008-11-14 10:39:23 +11003502 * @cred: the credentials to use
Casey Schauflere114e472008-02-04 22:29:50 -08003503 * @perm: unused
3504 *
3505 * Return 0 if the task has read and write to the object,
3506 * an error code otherwise
3507 */
3508static int smack_key_permission(key_ref_t key_ref,
David Howellsd84f4f92008-11-14 10:39:23 +11003509 const struct cred *cred, key_perm_t perm)
Casey Schauflere114e472008-02-04 22:29:50 -08003510{
3511 struct key *keyp;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003512 struct smk_audit_info ad;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003513 struct smack_known *tkp = smk_of_task(cred->security);
Casey Schauflere114e472008-02-04 22:29:50 -08003514
3515 keyp = key_ref_to_ptr(key_ref);
3516 if (keyp == NULL)
3517 return -EINVAL;
3518 /*
3519 * If the key hasn't been initialized give it access so that
3520 * it may do so.
3521 */
3522 if (keyp->security == NULL)
3523 return 0;
3524 /*
3525 * This should not occur
3526 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003527 if (tkp == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08003528 return -EACCES;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003529#ifdef CONFIG_AUDIT
3530 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3531 ad.a.u.key_struct.key = keyp->serial;
3532 ad.a.u.key_struct.key_desc = keyp->description;
3533#endif
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003534 return smk_access(tkp, keyp->security, MAY_READWRITE, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08003535}
3536#endif /* CONFIG_KEYS */
3537
3538/*
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003539 * Smack Audit hooks
3540 *
3541 * Audit requires a unique representation of each Smack specific
3542 * rule. This unique representation is used to distinguish the
3543 * object to be audited from remaining kernel objects and also
3544 * works as a glue between the audit hooks.
3545 *
3546 * Since repository entries are added but never deleted, we'll use
3547 * the smack_known label address related to the given audit rule as
3548 * the needed unique representation. This also better fits the smack
3549 * model where nearly everything is a label.
3550 */
3551#ifdef CONFIG_AUDIT
3552
3553/**
3554 * smack_audit_rule_init - Initialize a smack audit rule
3555 * @field: audit rule fields given from user-space (audit.h)
3556 * @op: required testing operator (=, !=, >, <, ...)
3557 * @rulestr: smack label to be audited
3558 * @vrule: pointer to save our own audit rule representation
3559 *
3560 * Prepare to audit cases where (@field @op @rulestr) is true.
3561 * The label to be audited is created if necessay.
3562 */
3563static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3564{
3565 char **rule = (char **)vrule;
3566 *rule = NULL;
3567
3568 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3569 return -EINVAL;
3570
Al Viro5af75d82008-12-16 05:59:26 -05003571 if (op != Audit_equal && op != Audit_not_equal)
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003572 return -EINVAL;
3573
3574 *rule = smk_import(rulestr, 0);
3575
3576 return 0;
3577}
3578
3579/**
3580 * smack_audit_rule_known - Distinguish Smack audit rules
3581 * @krule: rule of interest, in Audit kernel representation format
3582 *
3583 * This is used to filter Smack rules from remaining Audit ones.
3584 * If it's proved that this rule belongs to us, the
3585 * audit_rule_match hook will be called to do the final judgement.
3586 */
3587static int smack_audit_rule_known(struct audit_krule *krule)
3588{
3589 struct audit_field *f;
3590 int i;
3591
3592 for (i = 0; i < krule->field_count; i++) {
3593 f = &krule->fields[i];
3594
3595 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3596 return 1;
3597 }
3598
3599 return 0;
3600}
3601
3602/**
3603 * smack_audit_rule_match - Audit given object ?
3604 * @secid: security id for identifying the object to test
3605 * @field: audit rule flags given from user-space
3606 * @op: required testing operator
3607 * @vrule: smack internal rule presentation
3608 * @actx: audit context associated with the check
3609 *
3610 * The core Audit hook. It's used to take the decision of
3611 * whether to audit or not to audit a given object.
3612 */
3613static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3614 struct audit_context *actx)
3615{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003616 struct smack_known *skp;
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003617 char *rule = vrule;
3618
Richard Guy Briggs4eb0f4a2013-11-21 13:57:33 -05003619 if (unlikely(!rule)) {
3620 WARN_ONCE(1, "Smack: missing rule\n");
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003621 return -ENOENT;
3622 }
3623
3624 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3625 return 0;
3626
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003627 skp = smack_from_secid(secid);
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003628
3629 /*
3630 * No need to do string comparisons. If a match occurs,
3631 * both pointers will point to the same smack_known
3632 * label.
3633 */
Al Viro5af75d82008-12-16 05:59:26 -05003634 if (op == Audit_equal)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003635 return (rule == skp->smk_known);
Al Viro5af75d82008-12-16 05:59:26 -05003636 if (op == Audit_not_equal)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003637 return (rule != skp->smk_known);
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003638
3639 return 0;
3640}
3641
3642/**
3643 * smack_audit_rule_free - free smack rule representation
3644 * @vrule: rule to be freed.
3645 *
3646 * No memory was allocated.
3647 */
3648static void smack_audit_rule_free(void *vrule)
3649{
3650 /* No-op */
3651}
3652
3653#endif /* CONFIG_AUDIT */
3654
Randy Dunlap251a2a92009-02-18 11:42:33 -08003655/**
David Quigley746df9b2013-05-22 12:50:35 -04003656 * smack_ismaclabel - check if xattr @name references a smack MAC label
3657 * @name: Full xattr name to check.
3658 */
3659static int smack_ismaclabel(const char *name)
3660{
3661 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
3662}
3663
3664
3665/**
Casey Schauflere114e472008-02-04 22:29:50 -08003666 * smack_secid_to_secctx - return the smack label for a secid
3667 * @secid: incoming integer
3668 * @secdata: destination
3669 * @seclen: how long it is
3670 *
3671 * Exists for networking code.
3672 */
3673static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3674{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003675 struct smack_known *skp = smack_from_secid(secid);
Casey Schauflere114e472008-02-04 22:29:50 -08003676
Eric Parisd5630b92010-10-13 16:24:48 -04003677 if (secdata)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003678 *secdata = skp->smk_known;
3679 *seclen = strlen(skp->smk_known);
Casey Schauflere114e472008-02-04 22:29:50 -08003680 return 0;
3681}
3682
Randy Dunlap251a2a92009-02-18 11:42:33 -08003683/**
Casey Schaufler4bc87e62008-02-15 15:24:25 -08003684 * smack_secctx_to_secid - return the secid for a smack label
3685 * @secdata: smack label
3686 * @seclen: how long result is
3687 * @secid: outgoing integer
3688 *
3689 * Exists for audit and networking code.
3690 */
David Howellse52c17642008-04-29 20:52:51 +01003691static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
Casey Schaufler4bc87e62008-02-15 15:24:25 -08003692{
3693 *secid = smack_to_secid(secdata);
3694 return 0;
3695}
3696
Randy Dunlap251a2a92009-02-18 11:42:33 -08003697/**
Casey Schauflere114e472008-02-04 22:29:50 -08003698 * smack_release_secctx - don't do anything.
Randy Dunlap251a2a92009-02-18 11:42:33 -08003699 * @secdata: unused
3700 * @seclen: unused
Casey Schauflere114e472008-02-04 22:29:50 -08003701 *
3702 * Exists to make sure nothing gets done, and properly
3703 */
3704static void smack_release_secctx(char *secdata, u32 seclen)
3705{
3706}
3707
David P. Quigley1ee65e32009-09-03 14:25:57 -04003708static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3709{
3710 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3711}
3712
3713static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3714{
3715 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3716}
3717
3718static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3719{
3720 int len = 0;
3721 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3722
3723 if (len < 0)
3724 return len;
3725 *ctxlen = len;
3726 return 0;
3727}
3728
Ahmed S. Darwish076c54c2008-03-06 18:09:10 +02003729struct security_operations smack_ops = {
3730 .name = "smack",
3731
Ingo Molnar9e488582009-05-07 19:26:19 +10003732 .ptrace_access_check = smack_ptrace_access_check,
David Howells5cd9c582008-08-14 11:37:28 +01003733 .ptrace_traceme = smack_ptrace_traceme,
Casey Schauflere114e472008-02-04 22:29:50 -08003734 .syslog = smack_syslog,
Casey Schauflere114e472008-02-04 22:29:50 -08003735
3736 .sb_alloc_security = smack_sb_alloc_security,
3737 .sb_free_security = smack_sb_free_security,
3738 .sb_copy_data = smack_sb_copy_data,
3739 .sb_kern_mount = smack_sb_kern_mount,
3740 .sb_statfs = smack_sb_statfs,
Casey Schauflere114e472008-02-04 22:29:50 -08003741
Casey Schaufler676dac42010-12-02 06:43:39 -08003742 .bprm_set_creds = smack_bprm_set_creds,
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +03003743 .bprm_committing_creds = smack_bprm_committing_creds,
3744 .bprm_secureexec = smack_bprm_secureexec,
Casey Schaufler676dac42010-12-02 06:43:39 -08003745
Casey Schauflere114e472008-02-04 22:29:50 -08003746 .inode_alloc_security = smack_inode_alloc_security,
3747 .inode_free_security = smack_inode_free_security,
3748 .inode_init_security = smack_inode_init_security,
3749 .inode_link = smack_inode_link,
3750 .inode_unlink = smack_inode_unlink,
3751 .inode_rmdir = smack_inode_rmdir,
3752 .inode_rename = smack_inode_rename,
3753 .inode_permission = smack_inode_permission,
3754 .inode_setattr = smack_inode_setattr,
3755 .inode_getattr = smack_inode_getattr,
3756 .inode_setxattr = smack_inode_setxattr,
3757 .inode_post_setxattr = smack_inode_post_setxattr,
3758 .inode_getxattr = smack_inode_getxattr,
3759 .inode_removexattr = smack_inode_removexattr,
3760 .inode_getsecurity = smack_inode_getsecurity,
3761 .inode_setsecurity = smack_inode_setsecurity,
3762 .inode_listsecurity = smack_inode_listsecurity,
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003763 .inode_getsecid = smack_inode_getsecid,
Casey Schauflere114e472008-02-04 22:29:50 -08003764
3765 .file_permission = smack_file_permission,
3766 .file_alloc_security = smack_file_alloc_security,
3767 .file_free_security = smack_file_free_security,
3768 .file_ioctl = smack_file_ioctl,
3769 .file_lock = smack_file_lock,
3770 .file_fcntl = smack_file_fcntl,
Al Viroe5467852012-05-30 13:30:51 -04003771 .mmap_file = smack_mmap_file,
3772 .mmap_addr = cap_mmap_addr,
Casey Schauflere114e472008-02-04 22:29:50 -08003773 .file_set_fowner = smack_file_set_fowner,
3774 .file_send_sigiotask = smack_file_send_sigiotask,
3775 .file_receive = smack_file_receive,
3776
Eric Paris83d49852012-04-04 13:45:40 -04003777 .file_open = smack_file_open,
Casey Schaufler531f1d42011-09-19 12:41:42 -07003778
David Howellsee18d642009-09-02 09:14:21 +01003779 .cred_alloc_blank = smack_cred_alloc_blank,
David Howellsf1752ee2008-11-14 10:39:17 +11003780 .cred_free = smack_cred_free,
David Howellsd84f4f92008-11-14 10:39:23 +11003781 .cred_prepare = smack_cred_prepare,
David Howellsee18d642009-09-02 09:14:21 +01003782 .cred_transfer = smack_cred_transfer,
David Howells3a3b7ce2008-11-14 10:39:28 +11003783 .kernel_act_as = smack_kernel_act_as,
3784 .kernel_create_files_as = smack_kernel_create_files_as,
Casey Schauflere114e472008-02-04 22:29:50 -08003785 .task_setpgid = smack_task_setpgid,
3786 .task_getpgid = smack_task_getpgid,
3787 .task_getsid = smack_task_getsid,
3788 .task_getsecid = smack_task_getsecid,
3789 .task_setnice = smack_task_setnice,
3790 .task_setioprio = smack_task_setioprio,
3791 .task_getioprio = smack_task_getioprio,
3792 .task_setscheduler = smack_task_setscheduler,
3793 .task_getscheduler = smack_task_getscheduler,
3794 .task_movememory = smack_task_movememory,
3795 .task_kill = smack_task_kill,
3796 .task_wait = smack_task_wait,
Casey Schauflere114e472008-02-04 22:29:50 -08003797 .task_to_inode = smack_task_to_inode,
3798
3799 .ipc_permission = smack_ipc_permission,
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003800 .ipc_getsecid = smack_ipc_getsecid,
Casey Schauflere114e472008-02-04 22:29:50 -08003801
3802 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
3803 .msg_msg_free_security = smack_msg_msg_free_security,
3804
3805 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
3806 .msg_queue_free_security = smack_msg_queue_free_security,
3807 .msg_queue_associate = smack_msg_queue_associate,
3808 .msg_queue_msgctl = smack_msg_queue_msgctl,
3809 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
3810 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
3811
3812 .shm_alloc_security = smack_shm_alloc_security,
3813 .shm_free_security = smack_shm_free_security,
3814 .shm_associate = smack_shm_associate,
3815 .shm_shmctl = smack_shm_shmctl,
3816 .shm_shmat = smack_shm_shmat,
3817
3818 .sem_alloc_security = smack_sem_alloc_security,
3819 .sem_free_security = smack_sem_free_security,
3820 .sem_associate = smack_sem_associate,
3821 .sem_semctl = smack_sem_semctl,
3822 .sem_semop = smack_sem_semop,
3823
Casey Schauflere114e472008-02-04 22:29:50 -08003824 .d_instantiate = smack_d_instantiate,
3825
3826 .getprocattr = smack_getprocattr,
3827 .setprocattr = smack_setprocattr,
3828
3829 .unix_stream_connect = smack_unix_stream_connect,
3830 .unix_may_send = smack_unix_may_send,
3831
3832 .socket_post_create = smack_socket_post_create,
Casey Schauflerc6739442013-05-22 18:42:56 -07003833 .socket_bind = smack_socket_bind,
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003834 .socket_connect = smack_socket_connect,
3835 .socket_sendmsg = smack_socket_sendmsg,
Casey Schauflere114e472008-02-04 22:29:50 -08003836 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
3837 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
3838 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
3839 .sk_alloc_security = smack_sk_alloc_security,
3840 .sk_free_security = smack_sk_free_security,
3841 .sock_graft = smack_sock_graft,
3842 .inet_conn_request = smack_inet_conn_request,
Paul Moore07feee82009-03-27 17:10:54 -04003843 .inet_csk_clone = smack_inet_csk_clone,
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003844
Casey Schauflere114e472008-02-04 22:29:50 -08003845 /* key management security hooks */
3846#ifdef CONFIG_KEYS
3847 .key_alloc = smack_key_alloc,
3848 .key_free = smack_key_free,
3849 .key_permission = smack_key_permission,
3850#endif /* CONFIG_KEYS */
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003851
3852 /* Audit hooks */
3853#ifdef CONFIG_AUDIT
3854 .audit_rule_init = smack_audit_rule_init,
3855 .audit_rule_known = smack_audit_rule_known,
3856 .audit_rule_match = smack_audit_rule_match,
3857 .audit_rule_free = smack_audit_rule_free,
3858#endif /* CONFIG_AUDIT */
3859
David Quigley746df9b2013-05-22 12:50:35 -04003860 .ismaclabel = smack_ismaclabel,
Casey Schauflere114e472008-02-04 22:29:50 -08003861 .secid_to_secctx = smack_secid_to_secctx,
Casey Schaufler4bc87e62008-02-15 15:24:25 -08003862 .secctx_to_secid = smack_secctx_to_secid,
Casey Schauflere114e472008-02-04 22:29:50 -08003863 .release_secctx = smack_release_secctx,
David P. Quigley1ee65e32009-09-03 14:25:57 -04003864 .inode_notifysecctx = smack_inode_notifysecctx,
3865 .inode_setsecctx = smack_inode_setsecctx,
3866 .inode_getsecctx = smack_inode_getsecctx,
Casey Schauflere114e472008-02-04 22:29:50 -08003867};
3868
Etienne Basset7198e2e2009-03-24 20:53:24 +01003869
Casey Schaufler86812bb2012-04-17 18:55:46 -07003870static __init void init_smack_known_list(void)
Etienne Basset7198e2e2009-03-24 20:53:24 +01003871{
Casey Schaufler86812bb2012-04-17 18:55:46 -07003872 /*
Casey Schaufler86812bb2012-04-17 18:55:46 -07003873 * Initialize rule list locks
3874 */
3875 mutex_init(&smack_known_huh.smk_rules_lock);
3876 mutex_init(&smack_known_hat.smk_rules_lock);
3877 mutex_init(&smack_known_floor.smk_rules_lock);
3878 mutex_init(&smack_known_star.smk_rules_lock);
3879 mutex_init(&smack_known_invalid.smk_rules_lock);
3880 mutex_init(&smack_known_web.smk_rules_lock);
3881 /*
3882 * Initialize rule lists
3883 */
3884 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
3885 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
3886 INIT_LIST_HEAD(&smack_known_star.smk_rules);
3887 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
3888 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
3889 INIT_LIST_HEAD(&smack_known_web.smk_rules);
3890 /*
3891 * Create the known labels list
3892 */
Tomasz Stanislawski4d7cf4a2013-06-11 14:55:13 +02003893 smk_insert_entry(&smack_known_huh);
3894 smk_insert_entry(&smack_known_hat);
3895 smk_insert_entry(&smack_known_star);
3896 smk_insert_entry(&smack_known_floor);
3897 smk_insert_entry(&smack_known_invalid);
3898 smk_insert_entry(&smack_known_web);
Etienne Basset7198e2e2009-03-24 20:53:24 +01003899}
3900
Casey Schauflere114e472008-02-04 22:29:50 -08003901/**
3902 * smack_init - initialize the smack system
3903 *
3904 * Returns 0
3905 */
3906static __init int smack_init(void)
3907{
David Howellsd84f4f92008-11-14 10:39:23 +11003908 struct cred *cred;
Casey Schaufler676dac42010-12-02 06:43:39 -08003909 struct task_smack *tsp;
David Howellsd84f4f92008-11-14 10:39:23 +11003910
Casey Schaufler7898e1f2011-01-17 08:05:27 -08003911 if (!security_module_enable(&smack_ops))
3912 return 0;
3913
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003914 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
3915 GFP_KERNEL);
Casey Schaufler676dac42010-12-02 06:43:39 -08003916 if (tsp == NULL)
3917 return -ENOMEM;
3918
Casey Schauflere114e472008-02-04 22:29:50 -08003919 printk(KERN_INFO "Smack: Initializing.\n");
3920
3921 /*
3922 * Set the security state for the initial task.
3923 */
David Howellsd84f4f92008-11-14 10:39:23 +11003924 cred = (struct cred *) current->cred;
Casey Schaufler676dac42010-12-02 06:43:39 -08003925 cred->security = tsp;
Casey Schauflere114e472008-02-04 22:29:50 -08003926
Casey Schaufler86812bb2012-04-17 18:55:46 -07003927 /* initialize the smack_known_list */
3928 init_smack_known_list();
Casey Schauflere114e472008-02-04 22:29:50 -08003929
3930 /*
3931 * Register with LSM
3932 */
3933 if (register_security(&smack_ops))
3934 panic("smack: Unable to register with kernel.\n");
3935
3936 return 0;
3937}
3938
3939/*
3940 * Smack requires early initialization in order to label
3941 * all processes and objects when they are created.
3942 */
3943security_initcall(smack_init);