Commit | Line | Data |
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e114e473 CS |
1 | /* |
2 | * Simplified MAC Kernel (smack) security module | |
3 | * | |
4 | * This file contains the smack hook function implementations. | |
5 | * | |
5c6d1125 | 6 | * Authors: |
e114e473 | 7 | * Casey Schaufler <casey@schaufler-ca.com> |
84088ba2 | 8 | * Jarkko Sakkinen <jarkko.sakkinen@intel.com> |
e114e473 CS |
9 | * |
10 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f | 11 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
82c21bfa | 12 | * Paul Moore <paul@paul-moore.com> |
5c6d1125 | 13 | * Copyright (C) 2010 Nokia Corporation |
84088ba2 | 14 | * Copyright (C) 2011 Intel Corporation. |
e114e473 CS |
15 | * |
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> | |
e114e473 CS |
25 | #include <linux/kd.h> |
26 | #include <asm/ioctls.h> | |
07feee8f | 27 | #include <linux/ip.h> |
e114e473 CS |
28 | #include <linux/tcp.h> |
29 | #include <linux/udp.h> | |
c6739443 | 30 | #include <linux/dccp.h> |
d66a8acb | 31 | #include <linux/icmpv6.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
e114e473 CS |
33 | #include <linux/mutex.h> |
34 | #include <linux/pipe_fs_i.h> | |
e114e473 | 35 | #include <net/cipso_ipv4.h> |
c6739443 CS |
36 | #include <net/ip.h> |
37 | #include <net/ipv6.h> | |
d20bdda6 | 38 | #include <linux/audit.h> |
1fd7317d | 39 | #include <linux/magic.h> |
2a7dba39 | 40 | #include <linux/dcache.h> |
16014d87 | 41 | #include <linux/personality.h> |
40401530 AV |
42 | #include <linux/msg.h> |
43 | #include <linux/shm.h> | |
44 | #include <linux/binfmts.h> | |
3bf2789c | 45 | #include <linux/parser.h> |
e114e473 CS |
46 | #include "smack.h" |
47 | ||
5c6d1125 JS |
48 | #define TRANS_TRUE "TRUE" |
49 | #define TRANS_TRUE_SIZE 4 | |
50 | ||
c6739443 CS |
51 | #define SMK_CONNECTING 0 |
52 | #define SMK_RECEIVING 1 | |
53 | #define SMK_SENDING 2 | |
54 | ||
21abb1ec | 55 | #ifdef SMACK_IPV6_PORT_LABELING |
3c7ce342 | 56 | DEFINE_MUTEX(smack_ipv6_lock); |
8b549ef4 | 57 | static LIST_HEAD(smk_ipv6_port_list); |
21abb1ec | 58 | #endif |
1a5b472b | 59 | static struct kmem_cache *smack_inode_cache; |
69f287ae | 60 | int smack_enabled; |
c6739443 | 61 | |
3d04c924 | 62 | static const match_table_t smk_mount_tokens = { |
3bf2789c VT |
63 | {Opt_fsdefault, SMK_FSDEFAULT "%s"}, |
64 | {Opt_fsfloor, SMK_FSFLOOR "%s"}, | |
65 | {Opt_fshat, SMK_FSHAT "%s"}, | |
66 | {Opt_fsroot, SMK_FSROOT "%s"}, | |
67 | {Opt_fstransmute, SMK_FSTRANS "%s"}, | |
68 | {Opt_error, NULL}, | |
69 | }; | |
70 | ||
3d04c924 CS |
71 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
72 | static char *smk_bu_mess[] = { | |
73 | "Bringup Error", /* Unused */ | |
74 | "Bringup", /* SMACK_BRINGUP_ALLOW */ | |
75 | "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */ | |
76 | "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */ | |
77 | }; | |
78 | ||
d166c802 CS |
79 | static void smk_bu_mode(int mode, char *s) |
80 | { | |
81 | int i = 0; | |
82 | ||
83 | if (mode & MAY_READ) | |
84 | s[i++] = 'r'; | |
85 | if (mode & MAY_WRITE) | |
86 | s[i++] = 'w'; | |
87 | if (mode & MAY_EXEC) | |
88 | s[i++] = 'x'; | |
89 | if (mode & MAY_APPEND) | |
90 | s[i++] = 'a'; | |
91 | if (mode & MAY_TRANSMUTE) | |
92 | s[i++] = 't'; | |
93 | if (mode & MAY_LOCK) | |
94 | s[i++] = 'l'; | |
95 | if (i == 0) | |
96 | s[i++] = '-'; | |
97 | s[i] = '\0'; | |
98 | } | |
99 | #endif | |
100 | ||
101 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
102 | static int smk_bu_note(char *note, struct smack_known *sskp, |
103 | struct smack_known *oskp, int mode, int rc) | |
d166c802 CS |
104 | { |
105 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
106 | ||
107 | if (rc <= 0) | |
108 | return rc; | |
bf4b2fee CS |
109 | if (rc > SMACK_UNCONFINED_OBJECT) |
110 | rc = 0; | |
d166c802 CS |
111 | |
112 | smk_bu_mode(mode, acc); | |
bf4b2fee | 113 | pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc], |
21c7eae2 | 114 | sskp->smk_known, oskp->smk_known, acc, note); |
d166c802 CS |
115 | return 0; |
116 | } | |
117 | #else | |
21c7eae2 | 118 | #define smk_bu_note(note, sskp, oskp, mode, RC) (RC) |
d166c802 CS |
119 | #endif |
120 | ||
121 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
122 | static int smk_bu_current(char *note, struct smack_known *oskp, |
123 | int mode, int rc) | |
d166c802 CS |
124 | { |
125 | struct task_smack *tsp = current_security(); | |
126 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
127 | ||
128 | if (rc <= 0) | |
129 | return rc; | |
bf4b2fee CS |
130 | if (rc > SMACK_UNCONFINED_OBJECT) |
131 | rc = 0; | |
d166c802 CS |
132 | |
133 | smk_bu_mode(mode, acc); | |
bf4b2fee | 134 | pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc], |
21c7eae2 LP |
135 | tsp->smk_task->smk_known, oskp->smk_known, |
136 | acc, current->comm, note); | |
d166c802 CS |
137 | return 0; |
138 | } | |
139 | #else | |
21c7eae2 | 140 | #define smk_bu_current(note, oskp, mode, RC) (RC) |
d166c802 CS |
141 | #endif |
142 | ||
143 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
144 | static int smk_bu_task(struct task_struct *otp, int mode, int rc) | |
145 | { | |
146 | struct task_smack *tsp = current_security(); | |
6d1cff2a | 147 | struct smack_known *smk_task = smk_of_task_struct(otp); |
d166c802 CS |
148 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
149 | ||
150 | if (rc <= 0) | |
151 | return rc; | |
bf4b2fee CS |
152 | if (rc > SMACK_UNCONFINED_OBJECT) |
153 | rc = 0; | |
d166c802 CS |
154 | |
155 | smk_bu_mode(mode, acc); | |
bf4b2fee | 156 | pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc], |
6d1cff2a | 157 | tsp->smk_task->smk_known, smk_task->smk_known, acc, |
d166c802 CS |
158 | current->comm, otp->comm); |
159 | return 0; | |
160 | } | |
161 | #else | |
162 | #define smk_bu_task(otp, mode, RC) (RC) | |
163 | #endif | |
164 | ||
165 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
166 | static int smk_bu_inode(struct inode *inode, int mode, int rc) | |
167 | { | |
168 | struct task_smack *tsp = current_security(); | |
bf4b2fee | 169 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
170 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
171 | ||
bf4b2fee CS |
172 | if (isp->smk_flags & SMK_INODE_IMPURE) |
173 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
174 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
175 | ||
d166c802 CS |
176 | if (rc <= 0) |
177 | return rc; | |
bf4b2fee CS |
178 | if (rc > SMACK_UNCONFINED_OBJECT) |
179 | rc = 0; | |
180 | if (rc == SMACK_UNCONFINED_SUBJECT && | |
181 | (mode & (MAY_WRITE | MAY_APPEND))) | |
182 | isp->smk_flags |= SMK_INODE_IMPURE; | |
d166c802 CS |
183 | |
184 | smk_bu_mode(mode, acc); | |
bf4b2fee CS |
185 | |
186 | pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc], | |
187 | tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc, | |
d166c802 CS |
188 | inode->i_sb->s_id, inode->i_ino, current->comm); |
189 | return 0; | |
190 | } | |
191 | #else | |
192 | #define smk_bu_inode(inode, mode, RC) (RC) | |
193 | #endif | |
194 | ||
195 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
196 | static int smk_bu_file(struct file *file, int mode, int rc) | |
197 | { | |
198 | struct task_smack *tsp = current_security(); | |
199 | struct smack_known *sskp = tsp->smk_task; | |
5e7270a6 | 200 | struct inode *inode = file_inode(file); |
bf4b2fee | 201 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
202 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
203 | ||
bf4b2fee CS |
204 | if (isp->smk_flags & SMK_INODE_IMPURE) |
205 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
206 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
207 | ||
d166c802 CS |
208 | if (rc <= 0) |
209 | return rc; | |
bf4b2fee CS |
210 | if (rc > SMACK_UNCONFINED_OBJECT) |
211 | rc = 0; | |
d166c802 CS |
212 | |
213 | smk_bu_mode(mode, acc); | |
bf4b2fee | 214 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
5e7270a6 | 215 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 216 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
217 | current->comm); |
218 | return 0; | |
219 | } | |
220 | #else | |
221 | #define smk_bu_file(file, mode, RC) (RC) | |
222 | #endif | |
223 | ||
224 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
225 | static int smk_bu_credfile(const struct cred *cred, struct file *file, | |
226 | int mode, int rc) | |
227 | { | |
228 | struct task_smack *tsp = cred->security; | |
229 | struct smack_known *sskp = tsp->smk_task; | |
45063097 | 230 | struct inode *inode = file_inode(file); |
bf4b2fee | 231 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
232 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
233 | ||
bf4b2fee CS |
234 | if (isp->smk_flags & SMK_INODE_IMPURE) |
235 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
236 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
237 | ||
d166c802 CS |
238 | if (rc <= 0) |
239 | return rc; | |
bf4b2fee CS |
240 | if (rc > SMACK_UNCONFINED_OBJECT) |
241 | rc = 0; | |
d166c802 CS |
242 | |
243 | smk_bu_mode(mode, acc); | |
bf4b2fee | 244 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
21c7eae2 | 245 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 246 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
247 | current->comm); |
248 | return 0; | |
249 | } | |
250 | #else | |
251 | #define smk_bu_credfile(cred, file, mode, RC) (RC) | |
252 | #endif | |
253 | ||
e114e473 CS |
254 | /** |
255 | * smk_fetch - Fetch the smack label from a file. | |
1a28979b | 256 | * @name: type of the label (attribute) |
e114e473 CS |
257 | * @ip: a pointer to the inode |
258 | * @dp: a pointer to the dentry | |
259 | * | |
e774ad68 LP |
260 | * Returns a pointer to the master list entry for the Smack label, |
261 | * NULL if there was no label to fetch, or an error code. | |
e114e473 | 262 | */ |
2f823ff8 CS |
263 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
264 | struct dentry *dp) | |
e114e473 CS |
265 | { |
266 | int rc; | |
f7112e6c | 267 | char *buffer; |
2f823ff8 | 268 | struct smack_known *skp = NULL; |
e114e473 | 269 | |
5d6c3191 | 270 | if (!(ip->i_opflags & IOP_XATTR)) |
e774ad68 | 271 | return ERR_PTR(-EOPNOTSUPP); |
e114e473 | 272 | |
f7112e6c CS |
273 | buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); |
274 | if (buffer == NULL) | |
e774ad68 | 275 | return ERR_PTR(-ENOMEM); |
e114e473 | 276 | |
5d6c3191 | 277 | rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL); |
e774ad68 LP |
278 | if (rc < 0) |
279 | skp = ERR_PTR(rc); | |
280 | else if (rc == 0) | |
281 | skp = NULL; | |
282 | else | |
2f823ff8 | 283 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
284 | |
285 | kfree(buffer); | |
286 | ||
2f823ff8 | 287 | return skp; |
e114e473 CS |
288 | } |
289 | ||
290 | /** | |
291 | * new_inode_smack - allocate an inode security blob | |
21c7eae2 | 292 | * @skp: a pointer to the Smack label entry to use in the blob |
e114e473 CS |
293 | * |
294 | * Returns the new blob or NULL if there's no memory available | |
295 | */ | |
1eddfe8e | 296 | static struct inode_smack *new_inode_smack(struct smack_known *skp) |
e114e473 CS |
297 | { |
298 | struct inode_smack *isp; | |
299 | ||
1a5b472b | 300 | isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS); |
e114e473 CS |
301 | if (isp == NULL) |
302 | return NULL; | |
303 | ||
21c7eae2 | 304 | isp->smk_inode = skp; |
e114e473 CS |
305 | isp->smk_flags = 0; |
306 | mutex_init(&isp->smk_lock); | |
307 | ||
308 | return isp; | |
309 | } | |
310 | ||
7898e1f8 CS |
311 | /** |
312 | * new_task_smack - allocate a task security blob | |
1a28979b LP |
313 | * @task: a pointer to the Smack label for the running task |
314 | * @forked: a pointer to the Smack label for the forked task | |
315 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
316 | * |
317 | * Returns the new blob or NULL if there's no memory available | |
318 | */ | |
2f823ff8 CS |
319 | static struct task_smack *new_task_smack(struct smack_known *task, |
320 | struct smack_known *forked, gfp_t gfp) | |
7898e1f8 CS |
321 | { |
322 | struct task_smack *tsp; | |
323 | ||
324 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
325 | if (tsp == NULL) | |
326 | return NULL; | |
327 | ||
328 | tsp->smk_task = task; | |
329 | tsp->smk_forked = forked; | |
330 | INIT_LIST_HEAD(&tsp->smk_rules); | |
38416e53 | 331 | INIT_LIST_HEAD(&tsp->smk_relabel); |
7898e1f8 CS |
332 | mutex_init(&tsp->smk_rules_lock); |
333 | ||
334 | return tsp; | |
335 | } | |
336 | ||
337 | /** | |
338 | * smk_copy_rules - copy a rule set | |
1a28979b LP |
339 | * @nhead: new rules header pointer |
340 | * @ohead: old rules header pointer | |
341 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
342 | * |
343 | * Returns 0 on success, -ENOMEM on error | |
344 | */ | |
345 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
346 | gfp_t gfp) | |
347 | { | |
348 | struct smack_rule *nrp; | |
349 | struct smack_rule *orp; | |
350 | int rc = 0; | |
351 | ||
7898e1f8 CS |
352 | list_for_each_entry_rcu(orp, ohead, list) { |
353 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
354 | if (nrp == NULL) { | |
355 | rc = -ENOMEM; | |
356 | break; | |
357 | } | |
358 | *nrp = *orp; | |
359 | list_add_rcu(&nrp->list, nhead); | |
360 | } | |
361 | return rc; | |
362 | } | |
363 | ||
38416e53 ZJ |
364 | /** |
365 | * smk_copy_relabel - copy smk_relabel labels list | |
366 | * @nhead: new rules header pointer | |
367 | * @ohead: old rules header pointer | |
368 | * @gfp: type of the memory for the allocation | |
369 | * | |
370 | * Returns 0 on success, -ENOMEM on error | |
371 | */ | |
372 | static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead, | |
373 | gfp_t gfp) | |
374 | { | |
375 | struct smack_known_list_elem *nklep; | |
376 | struct smack_known_list_elem *oklep; | |
377 | ||
38416e53 ZJ |
378 | list_for_each_entry(oklep, ohead, list) { |
379 | nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp); | |
380 | if (nklep == NULL) { | |
381 | smk_destroy_label_list(nhead); | |
382 | return -ENOMEM; | |
383 | } | |
384 | nklep->smk_label = oklep->smk_label; | |
385 | list_add(&nklep->list, nhead); | |
386 | } | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
5663884c LP |
391 | /** |
392 | * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_* | |
393 | * @mode - input mode in form of PTRACE_MODE_* | |
394 | * | |
395 | * Returns a converted MAY_* mode usable by smack rules | |
396 | */ | |
397 | static inline unsigned int smk_ptrace_mode(unsigned int mode) | |
398 | { | |
3dfb7d8c | 399 | if (mode & PTRACE_MODE_ATTACH) |
5663884c | 400 | return MAY_READWRITE; |
3dfb7d8c JH |
401 | if (mode & PTRACE_MODE_READ) |
402 | return MAY_READ; | |
5663884c LP |
403 | |
404 | return 0; | |
405 | } | |
406 | ||
407 | /** | |
408 | * smk_ptrace_rule_check - helper for ptrace access | |
409 | * @tracer: tracer process | |
21c7eae2 | 410 | * @tracee_known: label entry of the process that's about to be traced |
5663884c LP |
411 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
412 | * @func: name of the function that called us, used for audit | |
413 | * | |
414 | * Returns 0 on access granted, -error on error | |
415 | */ | |
21c7eae2 LP |
416 | static int smk_ptrace_rule_check(struct task_struct *tracer, |
417 | struct smack_known *tracee_known, | |
5663884c LP |
418 | unsigned int mode, const char *func) |
419 | { | |
420 | int rc; | |
421 | struct smk_audit_info ad, *saip = NULL; | |
422 | struct task_smack *tsp; | |
21c7eae2 | 423 | struct smack_known *tracer_known; |
dcb569cf | 424 | const struct cred *tracercred; |
5663884c LP |
425 | |
426 | if ((mode & PTRACE_MODE_NOAUDIT) == 0) { | |
427 | smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK); | |
428 | smk_ad_setfield_u_tsk(&ad, tracer); | |
429 | saip = &ad; | |
430 | } | |
431 | ||
6d1cff2a | 432 | rcu_read_lock(); |
dcb569cf CS |
433 | tracercred = __task_cred(tracer); |
434 | tsp = tracercred->security; | |
21c7eae2 | 435 | tracer_known = smk_of_task(tsp); |
5663884c | 436 | |
66867818 LP |
437 | if ((mode & PTRACE_MODE_ATTACH) && |
438 | (smack_ptrace_rule == SMACK_PTRACE_EXACT || | |
439 | smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) { | |
21c7eae2 | 440 | if (tracer_known->smk_known == tracee_known->smk_known) |
66867818 LP |
441 | rc = 0; |
442 | else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN) | |
443 | rc = -EACCES; | |
dcb569cf | 444 | else if (smack_privileged_cred(CAP_SYS_PTRACE, tracercred)) |
66867818 LP |
445 | rc = 0; |
446 | else | |
447 | rc = -EACCES; | |
448 | ||
449 | if (saip) | |
21c7eae2 LP |
450 | smack_log(tracer_known->smk_known, |
451 | tracee_known->smk_known, | |
452 | 0, rc, saip); | |
66867818 | 453 | |
6d1cff2a | 454 | rcu_read_unlock(); |
66867818 LP |
455 | return rc; |
456 | } | |
457 | ||
458 | /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */ | |
21c7eae2 | 459 | rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip); |
6d1cff2a AR |
460 | |
461 | rcu_read_unlock(); | |
5663884c LP |
462 | return rc; |
463 | } | |
464 | ||
e114e473 CS |
465 | /* |
466 | * LSM hooks. | |
467 | * We he, that is fun! | |
468 | */ | |
469 | ||
470 | /** | |
9e48858f | 471 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 472 | * @ctp: child task pointer |
5663884c | 473 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
e114e473 CS |
474 | * |
475 | * Returns 0 if access is OK, an error code otherwise | |
476 | * | |
5663884c | 477 | * Do the capability checks. |
e114e473 | 478 | */ |
9e48858f | 479 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 | 480 | { |
2f823ff8 | 481 | struct smack_known *skp; |
e114e473 | 482 | |
6d1cff2a | 483 | skp = smk_of_task_struct(ctp); |
ecfcc53f | 484 | |
b1d9e6b0 | 485 | return smk_ptrace_rule_check(current, skp, mode, __func__); |
5cd9c58f DH |
486 | } |
487 | ||
488 | /** | |
489 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
490 | * @ptp: parent task pointer | |
491 | * | |
492 | * Returns 0 if access is OK, an error code otherwise | |
493 | * | |
5663884c | 494 | * Do the capability checks, and require PTRACE_MODE_ATTACH. |
5cd9c58f DH |
495 | */ |
496 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
497 | { | |
498 | int rc; | |
2f823ff8 | 499 | struct smack_known *skp; |
5cd9c58f | 500 | |
959e6c7f | 501 | skp = smk_of_task(current_security()); |
ecfcc53f | 502 | |
21c7eae2 | 503 | rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__); |
e114e473 CS |
504 | return rc; |
505 | } | |
506 | ||
507 | /** | |
508 | * smack_syslog - Smack approval on syslog | |
509 | * @type: message type | |
510 | * | |
e114e473 CS |
511 | * Returns 0 on success, error code otherwise. |
512 | */ | |
12b3052c | 513 | static int smack_syslog(int typefrom_file) |
e114e473 | 514 | { |
12b3052c | 515 | int rc = 0; |
2f823ff8 | 516 | struct smack_known *skp = smk_of_current(); |
e114e473 | 517 | |
1880eff7 | 518 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
e114e473 CS |
519 | return 0; |
520 | ||
24ea1b6e | 521 | if (smack_syslog_label != NULL && smack_syslog_label != skp) |
e114e473 CS |
522 | rc = -EACCES; |
523 | ||
524 | return rc; | |
525 | } | |
526 | ||
527 | ||
528 | /* | |
529 | * Superblock Hooks. | |
530 | */ | |
531 | ||
532 | /** | |
533 | * smack_sb_alloc_security - allocate a superblock blob | |
534 | * @sb: the superblock getting the blob | |
535 | * | |
536 | * Returns 0 on success or -ENOMEM on error. | |
537 | */ | |
538 | static int smack_sb_alloc_security(struct super_block *sb) | |
539 | { | |
540 | struct superblock_smack *sbsp; | |
541 | ||
542 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
543 | ||
544 | if (sbsp == NULL) | |
545 | return -ENOMEM; | |
546 | ||
21c7eae2 LP |
547 | sbsp->smk_root = &smack_known_floor; |
548 | sbsp->smk_default = &smack_known_floor; | |
549 | sbsp->smk_floor = &smack_known_floor; | |
550 | sbsp->smk_hat = &smack_known_hat; | |
e830b394 | 551 | /* |
9f50eda2 | 552 | * SMK_SB_INITIALIZED will be zero from kzalloc. |
e830b394 | 553 | */ |
e114e473 CS |
554 | sb->s_security = sbsp; |
555 | ||
556 | return 0; | |
557 | } | |
558 | ||
559 | /** | |
560 | * smack_sb_free_security - free a superblock blob | |
561 | * @sb: the superblock getting the blob | |
562 | * | |
563 | */ | |
564 | static void smack_sb_free_security(struct super_block *sb) | |
565 | { | |
566 | kfree(sb->s_security); | |
567 | sb->s_security = NULL; | |
568 | } | |
569 | ||
570 | /** | |
571 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 572 | * @orig: where to start |
251a2a95 | 573 | * @smackopts: mount options string |
e114e473 CS |
574 | * |
575 | * Returns 0 on success or -ENOMEM on error. | |
576 | * | |
577 | * Copy the Smack specific mount options out of the mount | |
578 | * options list. | |
579 | */ | |
e0007529 | 580 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
581 | { |
582 | char *cp, *commap, *otheropts, *dp; | |
583 | ||
e114e473 CS |
584 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
585 | if (otheropts == NULL) | |
586 | return -ENOMEM; | |
587 | ||
588 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
589 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
590 | dp = smackopts; | |
591 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
592 | dp = smackopts; | |
593 | else if (strstr(cp, SMK_FSHAT) == cp) | |
594 | dp = smackopts; | |
595 | else if (strstr(cp, SMK_FSROOT) == cp) | |
596 | dp = smackopts; | |
e830b394 CS |
597 | else if (strstr(cp, SMK_FSTRANS) == cp) |
598 | dp = smackopts; | |
e114e473 CS |
599 | else |
600 | dp = otheropts; | |
601 | ||
602 | commap = strchr(cp, ','); | |
603 | if (commap != NULL) | |
604 | *commap = '\0'; | |
605 | ||
606 | if (*dp != '\0') | |
607 | strcat(dp, ","); | |
608 | strcat(dp, cp); | |
609 | } | |
610 | ||
611 | strcpy(orig, otheropts); | |
612 | free_page((unsigned long)otheropts); | |
613 | ||
614 | return 0; | |
615 | } | |
616 | ||
617 | /** | |
3bf2789c VT |
618 | * smack_parse_opts_str - parse Smack specific mount options |
619 | * @options: mount options string | |
620 | * @opts: where to store converted mount opts | |
621 | * | |
622 | * Returns 0 on success or -ENOMEM on error. | |
623 | * | |
624 | * converts Smack specific mount options to generic security option format | |
625 | */ | |
626 | static int smack_parse_opts_str(char *options, | |
627 | struct security_mnt_opts *opts) | |
628 | { | |
629 | char *p; | |
3d04c924 CS |
630 | char *fsdefault = NULL; |
631 | char *fsfloor = NULL; | |
632 | char *fshat = NULL; | |
633 | char *fsroot = NULL; | |
634 | char *fstransmute = NULL; | |
635 | int rc = -ENOMEM; | |
636 | int num_mnt_opts = 0; | |
637 | int token; | |
3bf2789c VT |
638 | |
639 | opts->num_mnt_opts = 0; | |
640 | ||
641 | if (!options) | |
642 | return 0; | |
643 | ||
644 | while ((p = strsep(&options, ",")) != NULL) { | |
3bf2789c VT |
645 | substring_t args[MAX_OPT_ARGS]; |
646 | ||
647 | if (!*p) | |
648 | continue; | |
649 | ||
3d04c924 | 650 | token = match_token(p, smk_mount_tokens, args); |
3bf2789c VT |
651 | |
652 | switch (token) { | |
653 | case Opt_fsdefault: | |
654 | if (fsdefault) | |
655 | goto out_opt_err; | |
656 | fsdefault = match_strdup(&args[0]); | |
657 | if (!fsdefault) | |
658 | goto out_err; | |
659 | break; | |
660 | case Opt_fsfloor: | |
661 | if (fsfloor) | |
662 | goto out_opt_err; | |
663 | fsfloor = match_strdup(&args[0]); | |
664 | if (!fsfloor) | |
665 | goto out_err; | |
666 | break; | |
667 | case Opt_fshat: | |
668 | if (fshat) | |
669 | goto out_opt_err; | |
670 | fshat = match_strdup(&args[0]); | |
671 | if (!fshat) | |
672 | goto out_err; | |
673 | break; | |
674 | case Opt_fsroot: | |
675 | if (fsroot) | |
676 | goto out_opt_err; | |
677 | fsroot = match_strdup(&args[0]); | |
678 | if (!fsroot) | |
679 | goto out_err; | |
680 | break; | |
681 | case Opt_fstransmute: | |
682 | if (fstransmute) | |
683 | goto out_opt_err; | |
684 | fstransmute = match_strdup(&args[0]); | |
685 | if (!fstransmute) | |
686 | goto out_err; | |
687 | break; | |
688 | default: | |
689 | rc = -EINVAL; | |
690 | pr_warn("Smack: unknown mount option\n"); | |
691 | goto out_err; | |
692 | } | |
693 | } | |
694 | ||
8c15d66e | 695 | opts->mnt_opts = kcalloc(NUM_SMK_MNT_OPTS, sizeof(char *), GFP_KERNEL); |
3bf2789c VT |
696 | if (!opts->mnt_opts) |
697 | goto out_err; | |
698 | ||
699 | opts->mnt_opts_flags = kcalloc(NUM_SMK_MNT_OPTS, sizeof(int), | |
8c15d66e | 700 | GFP_KERNEL); |
c3c8dc9f | 701 | if (!opts->mnt_opts_flags) |
3bf2789c | 702 | goto out_err; |
3bf2789c VT |
703 | |
704 | if (fsdefault) { | |
705 | opts->mnt_opts[num_mnt_opts] = fsdefault; | |
706 | opts->mnt_opts_flags[num_mnt_opts++] = FSDEFAULT_MNT; | |
707 | } | |
708 | if (fsfloor) { | |
709 | opts->mnt_opts[num_mnt_opts] = fsfloor; | |
710 | opts->mnt_opts_flags[num_mnt_opts++] = FSFLOOR_MNT; | |
711 | } | |
712 | if (fshat) { | |
713 | opts->mnt_opts[num_mnt_opts] = fshat; | |
714 | opts->mnt_opts_flags[num_mnt_opts++] = FSHAT_MNT; | |
715 | } | |
716 | if (fsroot) { | |
717 | opts->mnt_opts[num_mnt_opts] = fsroot; | |
718 | opts->mnt_opts_flags[num_mnt_opts++] = FSROOT_MNT; | |
719 | } | |
720 | if (fstransmute) { | |
721 | opts->mnt_opts[num_mnt_opts] = fstransmute; | |
722 | opts->mnt_opts_flags[num_mnt_opts++] = FSTRANS_MNT; | |
723 | } | |
724 | ||
725 | opts->num_mnt_opts = num_mnt_opts; | |
726 | return 0; | |
727 | ||
728 | out_opt_err: | |
729 | rc = -EINVAL; | |
730 | pr_warn("Smack: duplicate mount options\n"); | |
731 | ||
732 | out_err: | |
733 | kfree(fsdefault); | |
734 | kfree(fsfloor); | |
735 | kfree(fshat); | |
736 | kfree(fsroot); | |
737 | kfree(fstransmute); | |
738 | return rc; | |
739 | } | |
740 | ||
741 | /** | |
742 | * smack_set_mnt_opts - set Smack specific mount options | |
e114e473 | 743 | * @sb: the file system superblock |
3bf2789c VT |
744 | * @opts: Smack mount options |
745 | * @kern_flags: mount option from kernel space or user space | |
746 | * @set_kern_flags: where to store converted mount opts | |
e114e473 CS |
747 | * |
748 | * Returns 0 on success, an error code on failure | |
3bf2789c VT |
749 | * |
750 | * Allow filesystems with binary mount data to explicitly set Smack mount | |
751 | * labels. | |
e114e473 | 752 | */ |
3bf2789c VT |
753 | static int smack_set_mnt_opts(struct super_block *sb, |
754 | struct security_mnt_opts *opts, | |
755 | unsigned long kern_flags, | |
756 | unsigned long *set_kern_flags) | |
e114e473 CS |
757 | { |
758 | struct dentry *root = sb->s_root; | |
c6f493d6 | 759 | struct inode *inode = d_backing_inode(root); |
e114e473 CS |
760 | struct superblock_smack *sp = sb->s_security; |
761 | struct inode_smack *isp; | |
24ea1b6e | 762 | struct smack_known *skp; |
3bf2789c VT |
763 | int i; |
764 | int num_opts = opts->num_mnt_opts; | |
e830b394 | 765 | int transmute = 0; |
e114e473 | 766 | |
9f50eda2 | 767 | if (sp->smk_flags & SMK_SB_INITIALIZED) |
e114e473 | 768 | return 0; |
eb982cb4 | 769 | |
2097f599 HS |
770 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
771 | /* | |
772 | * Unprivileged mounts don't get to specify Smack values. | |
773 | */ | |
774 | if (num_opts) | |
775 | return -EPERM; | |
776 | /* | |
777 | * Unprivileged mounts get root and default from the caller. | |
778 | */ | |
779 | skp = smk_of_current(); | |
780 | sp->smk_root = skp; | |
781 | sp->smk_default = skp; | |
782 | /* | |
783 | * For a handful of fs types with no user-controlled | |
784 | * backing store it's okay to trust security labels | |
785 | * in the filesystem. The rest are untrusted. | |
786 | */ | |
787 | if (sb->s_user_ns != &init_user_ns && | |
788 | sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC && | |
789 | sb->s_magic != RAMFS_MAGIC) { | |
790 | transmute = 1; | |
791 | sp->smk_flags |= SMK_SB_UNTRUSTED; | |
792 | } | |
793 | } | |
794 | ||
9f50eda2 | 795 | sp->smk_flags |= SMK_SB_INITIALIZED; |
e114e473 | 796 | |
3bf2789c VT |
797 | for (i = 0; i < num_opts; i++) { |
798 | switch (opts->mnt_opts_flags[i]) { | |
799 | case FSDEFAULT_MNT: | |
800 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
801 | if (IS_ERR(skp)) |
802 | return PTR_ERR(skp); | |
3bf2789c VT |
803 | sp->smk_default = skp; |
804 | break; | |
805 | case FSFLOOR_MNT: | |
806 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
807 | if (IS_ERR(skp)) |
808 | return PTR_ERR(skp); | |
809 | sp->smk_floor = skp; | |
3bf2789c VT |
810 | break; |
811 | case FSHAT_MNT: | |
812 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
813 | if (IS_ERR(skp)) |
814 | return PTR_ERR(skp); | |
3bf2789c VT |
815 | sp->smk_hat = skp; |
816 | break; | |
817 | case FSROOT_MNT: | |
818 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
819 | if (IS_ERR(skp)) |
820 | return PTR_ERR(skp); | |
821 | sp->smk_root = skp; | |
3bf2789c VT |
822 | break; |
823 | case FSTRANS_MNT: | |
824 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
825 | if (IS_ERR(skp)) |
826 | return PTR_ERR(skp); | |
827 | sp->smk_root = skp; | |
828 | transmute = 1; | |
3bf2789c VT |
829 | break; |
830 | default: | |
831 | break; | |
e114e473 CS |
832 | } |
833 | } | |
834 | ||
835 | /* | |
836 | * Initialize the root inode. | |
837 | */ | |
838 | isp = inode->i_security; | |
55dfc5da JB |
839 | if (isp == NULL) { |
840 | isp = new_inode_smack(sp->smk_root); | |
841 | if (isp == NULL) | |
842 | return -ENOMEM; | |
843 | inode->i_security = isp; | |
e830b394 | 844 | } else |
e114e473 CS |
845 | isp->smk_inode = sp->smk_root; |
846 | ||
e830b394 CS |
847 | if (transmute) |
848 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
849 | ||
e114e473 CS |
850 | return 0; |
851 | } | |
852 | ||
3bf2789c VT |
853 | /** |
854 | * smack_sb_kern_mount - Smack specific mount processing | |
855 | * @sb: the file system superblock | |
856 | * @flags: the mount flags | |
857 | * @data: the smack mount options | |
858 | * | |
859 | * Returns 0 on success, an error code on failure | |
860 | */ | |
861 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) | |
862 | { | |
863 | int rc = 0; | |
864 | char *options = data; | |
865 | struct security_mnt_opts opts; | |
866 | ||
867 | security_init_mnt_opts(&opts); | |
868 | ||
869 | if (!options) | |
870 | goto out; | |
871 | ||
872 | rc = smack_parse_opts_str(options, &opts); | |
873 | if (rc) | |
874 | goto out_err; | |
875 | ||
876 | out: | |
877 | rc = smack_set_mnt_opts(sb, &opts, 0, NULL); | |
878 | ||
879 | out_err: | |
880 | security_free_mnt_opts(&opts); | |
881 | return rc; | |
882 | } | |
883 | ||
e114e473 CS |
884 | /** |
885 | * smack_sb_statfs - Smack check on statfs | |
886 | * @dentry: identifies the file system in question | |
887 | * | |
888 | * Returns 0 if current can read the floor of the filesystem, | |
889 | * and error code otherwise | |
890 | */ | |
891 | static int smack_sb_statfs(struct dentry *dentry) | |
892 | { | |
893 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
894 | int rc; |
895 | struct smk_audit_info ad; | |
896 | ||
a269434d | 897 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 898 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 899 | |
ecfcc53f | 900 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
d166c802 | 901 | rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc); |
ecfcc53f | 902 | return rc; |
e114e473 CS |
903 | } |
904 | ||
676dac4b CS |
905 | /* |
906 | * BPRM hooks | |
907 | */ | |
908 | ||
ce8a4321 CS |
909 | /** |
910 | * smack_bprm_set_creds - set creds for exec | |
911 | * @bprm: the exec information | |
912 | * | |
5663884c | 913 | * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise |
ce8a4321 | 914 | */ |
676dac4b CS |
915 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
916 | { | |
496ad9aa | 917 | struct inode *inode = file_inode(bprm->file); |
84088ba2 | 918 | struct task_smack *bsp = bprm->cred->security; |
676dac4b | 919 | struct inode_smack *isp; |
809c02e0 | 920 | struct superblock_smack *sbsp; |
676dac4b CS |
921 | int rc; |
922 | ||
ddb4a144 | 923 | if (bprm->called_set_creds) |
676dac4b CS |
924 | return 0; |
925 | ||
84088ba2 JS |
926 | isp = inode->i_security; |
927 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
928 | return 0; |
929 | ||
809c02e0 SF |
930 | sbsp = inode->i_sb->s_security; |
931 | if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) && | |
932 | isp->smk_task != sbsp->smk_root) | |
933 | return 0; | |
934 | ||
9227dd2a | 935 | if (bprm->unsafe & LSM_UNSAFE_PTRACE) { |
5663884c LP |
936 | struct task_struct *tracer; |
937 | rc = 0; | |
938 | ||
939 | rcu_read_lock(); | |
940 | tracer = ptrace_parent(current); | |
941 | if (likely(tracer != NULL)) | |
942 | rc = smk_ptrace_rule_check(tracer, | |
21c7eae2 | 943 | isp->smk_task, |
5663884c LP |
944 | PTRACE_MODE_ATTACH, |
945 | __func__); | |
946 | rcu_read_unlock(); | |
947 | ||
948 | if (rc != 0) | |
949 | return rc; | |
950 | } else if (bprm->unsafe) | |
84088ba2 | 951 | return -EPERM; |
676dac4b | 952 | |
84088ba2 JS |
953 | bsp->smk_task = isp->smk_task; |
954 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 955 | |
ccbb6e10 KC |
956 | /* Decide if this is a secure exec. */ |
957 | if (bsp->smk_task != bsp->smk_forked) | |
958 | bprm->secureexec = 1; | |
959 | ||
84088ba2 JS |
960 | return 0; |
961 | } | |
676dac4b | 962 | |
e114e473 CS |
963 | /* |
964 | * Inode hooks | |
965 | */ | |
966 | ||
967 | /** | |
968 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 969 | * @inode: the inode in need of a blob |
e114e473 CS |
970 | * |
971 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
972 | */ | |
973 | static int smack_inode_alloc_security(struct inode *inode) | |
974 | { | |
2f823ff8 CS |
975 | struct smack_known *skp = smk_of_current(); |
976 | ||
21c7eae2 | 977 | inode->i_security = new_inode_smack(skp); |
e114e473 CS |
978 | if (inode->i_security == NULL) |
979 | return -ENOMEM; | |
980 | return 0; | |
981 | } | |
982 | ||
983 | /** | |
3d4f673a HS |
984 | * smack_inode_free_rcu - Free inode_smack blob from cache |
985 | * @head: the rcu_head for getting inode_smack pointer | |
986 | * | |
987 | * Call back function called from call_rcu() to free | |
988 | * the i_security blob pointer in inode | |
989 | */ | |
990 | static void smack_inode_free_rcu(struct rcu_head *head) | |
991 | { | |
992 | struct inode_smack *issp; | |
993 | ||
994 | issp = container_of(head, struct inode_smack, smk_rcu); | |
995 | kmem_cache_free(smack_inode_cache, issp); | |
996 | } | |
997 | ||
998 | /** | |
999 | * smack_inode_free_security - free an inode blob using call_rcu() | |
251a2a95 | 1000 | * @inode: the inode with a blob |
e114e473 | 1001 | * |
3d4f673a | 1002 | * Clears the blob pointer in inode using RCU |
e114e473 CS |
1003 | */ |
1004 | static void smack_inode_free_security(struct inode *inode) | |
1005 | { | |
3d4f673a HS |
1006 | struct inode_smack *issp = inode->i_security; |
1007 | ||
1008 | /* | |
1009 | * The inode may still be referenced in a path walk and | |
1010 | * a call to smack_inode_permission() can be made | |
1011 | * after smack_inode_free_security() is called. | |
1012 | * To avoid race condition free the i_security via RCU | |
1013 | * and leave the current inode->i_security pointer intact. | |
1014 | * The inode will be freed after the RCU grace period too. | |
1015 | */ | |
1016 | call_rcu(&issp->smk_rcu, smack_inode_free_rcu); | |
e114e473 CS |
1017 | } |
1018 | ||
1019 | /** | |
1020 | * smack_inode_init_security - copy out the smack from an inode | |
e95ef49b LP |
1021 | * @inode: the newly created inode |
1022 | * @dir: containing directory object | |
2a7dba39 | 1023 | * @qstr: unused |
e114e473 CS |
1024 | * @name: where to put the attribute name |
1025 | * @value: where to put the attribute value | |
1026 | * @len: where to put the length of the attribute | |
1027 | * | |
1028 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
1029 | */ | |
1030 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
9548906b | 1031 | const struct qstr *qstr, const char **name, |
2a7dba39 | 1032 | void **value, size_t *len) |
e114e473 | 1033 | { |
2267b13a | 1034 | struct inode_smack *issp = inode->i_security; |
2f823ff8 | 1035 | struct smack_known *skp = smk_of_current(); |
21c7eae2 LP |
1036 | struct smack_known *isp = smk_of_inode(inode); |
1037 | struct smack_known *dsp = smk_of_inode(dir); | |
7898e1f8 | 1038 | int may; |
e114e473 | 1039 | |
9548906b TH |
1040 | if (name) |
1041 | *name = XATTR_SMACK_SUFFIX; | |
e114e473 | 1042 | |
68390ccf | 1043 | if (value && len) { |
7898e1f8 | 1044 | rcu_read_lock(); |
21c7eae2 LP |
1045 | may = smk_access_entry(skp->smk_known, dsp->smk_known, |
1046 | &skp->smk_rules); | |
7898e1f8 | 1047 | rcu_read_unlock(); |
5c6d1125 JS |
1048 | |
1049 | /* | |
1050 | * If the access rule allows transmutation and | |
1051 | * the directory requests transmutation then | |
1052 | * by all means transmute. | |
2267b13a | 1053 | * Mark the inode as changed. |
5c6d1125 | 1054 | */ |
7898e1f8 | 1055 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
2267b13a | 1056 | smk_inode_transmutable(dir)) { |
5c6d1125 | 1057 | isp = dsp; |
2267b13a CS |
1058 | issp->smk_flags |= SMK_INODE_CHANGED; |
1059 | } | |
5c6d1125 | 1060 | |
21c7eae2 | 1061 | *value = kstrdup(isp->smk_known, GFP_NOFS); |
e114e473 CS |
1062 | if (*value == NULL) |
1063 | return -ENOMEM; | |
e114e473 | 1064 | |
21c7eae2 | 1065 | *len = strlen(isp->smk_known); |
68390ccf | 1066 | } |
e114e473 CS |
1067 | |
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | /** | |
1072 | * smack_inode_link - Smack check on link | |
1073 | * @old_dentry: the existing object | |
1074 | * @dir: unused | |
1075 | * @new_dentry: the new object | |
1076 | * | |
1077 | * Returns 0 if access is permitted, an error code otherwise | |
1078 | */ | |
1079 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
1080 | struct dentry *new_dentry) | |
1081 | { | |
21c7eae2 | 1082 | struct smack_known *isp; |
ecfcc53f EB |
1083 | struct smk_audit_info ad; |
1084 | int rc; | |
1085 | ||
a269434d | 1086 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1087 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1088 | |
c6f493d6 | 1089 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1090 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
c6f493d6 | 1091 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc); |
e114e473 | 1092 | |
8802565b | 1093 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1094 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1095 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1096 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
c6f493d6 | 1097 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc); |
e114e473 CS |
1098 | } |
1099 | ||
1100 | return rc; | |
1101 | } | |
1102 | ||
1103 | /** | |
1104 | * smack_inode_unlink - Smack check on inode deletion | |
1105 | * @dir: containing directory object | |
1106 | * @dentry: file to unlink | |
1107 | * | |
1108 | * Returns 0 if current can write the containing directory | |
1109 | * and the object, error code otherwise | |
1110 | */ | |
1111 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
1112 | { | |
c6f493d6 | 1113 | struct inode *ip = d_backing_inode(dentry); |
ecfcc53f | 1114 | struct smk_audit_info ad; |
e114e473 CS |
1115 | int rc; |
1116 | ||
a269434d | 1117 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1118 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1119 | ||
e114e473 CS |
1120 | /* |
1121 | * You need write access to the thing you're unlinking | |
1122 | */ | |
ecfcc53f | 1123 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
d166c802 | 1124 | rc = smk_bu_inode(ip, MAY_WRITE, rc); |
ecfcc53f | 1125 | if (rc == 0) { |
e114e473 CS |
1126 | /* |
1127 | * You also need write access to the containing directory | |
1128 | */ | |
cdb56b60 | 1129 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1130 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1131 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1132 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1133 | } |
e114e473 CS |
1134 | return rc; |
1135 | } | |
1136 | ||
1137 | /** | |
1138 | * smack_inode_rmdir - Smack check on directory deletion | |
1139 | * @dir: containing directory object | |
1140 | * @dentry: directory to unlink | |
1141 | * | |
1142 | * Returns 0 if current can write the containing directory | |
1143 | * and the directory, error code otherwise | |
1144 | */ | |
1145 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
1146 | { | |
ecfcc53f | 1147 | struct smk_audit_info ad; |
e114e473 CS |
1148 | int rc; |
1149 | ||
a269434d | 1150 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1151 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1152 | ||
e114e473 CS |
1153 | /* |
1154 | * You need write access to the thing you're removing | |
1155 | */ | |
c6f493d6 DH |
1156 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1157 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
ecfcc53f | 1158 | if (rc == 0) { |
e114e473 CS |
1159 | /* |
1160 | * You also need write access to the containing directory | |
1161 | */ | |
cdb56b60 | 1162 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1163 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1164 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1165 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1166 | } |
e114e473 CS |
1167 | |
1168 | return rc; | |
1169 | } | |
1170 | ||
1171 | /** | |
1172 | * smack_inode_rename - Smack check on rename | |
e95ef49b LP |
1173 | * @old_inode: unused |
1174 | * @old_dentry: the old object | |
1175 | * @new_inode: unused | |
1176 | * @new_dentry: the new object | |
e114e473 CS |
1177 | * |
1178 | * Read and write access is required on both the old and | |
1179 | * new directories. | |
1180 | * | |
1181 | * Returns 0 if access is permitted, an error code otherwise | |
1182 | */ | |
1183 | static int smack_inode_rename(struct inode *old_inode, | |
1184 | struct dentry *old_dentry, | |
1185 | struct inode *new_inode, | |
1186 | struct dentry *new_dentry) | |
1187 | { | |
1188 | int rc; | |
21c7eae2 | 1189 | struct smack_known *isp; |
ecfcc53f EB |
1190 | struct smk_audit_info ad; |
1191 | ||
a269434d | 1192 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1193 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1194 | |
c6f493d6 | 1195 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1196 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
c6f493d6 | 1197 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc); |
e114e473 | 1198 | |
8802565b | 1199 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1200 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1201 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1202 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
c6f493d6 | 1203 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc); |
e114e473 | 1204 | } |
e114e473 CS |
1205 | return rc; |
1206 | } | |
1207 | ||
1208 | /** | |
1209 | * smack_inode_permission - Smack version of permission() | |
1210 | * @inode: the inode in question | |
1211 | * @mask: the access requested | |
e114e473 CS |
1212 | * |
1213 | * This is the important Smack hook. | |
1214 | * | |
1215 | * Returns 0 if access is permitted, -EACCES otherwise | |
1216 | */ | |
e74f71eb | 1217 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 1218 | { |
9f50eda2 | 1219 | struct superblock_smack *sbsp = inode->i_sb->s_security; |
ecfcc53f | 1220 | struct smk_audit_info ad; |
e74f71eb | 1221 | int no_block = mask & MAY_NOT_BLOCK; |
d166c802 | 1222 | int rc; |
d09ca739 EP |
1223 | |
1224 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
1225 | /* |
1226 | * No permission to check. Existence test. Yup, it's there. | |
1227 | */ | |
1228 | if (mask == 0) | |
1229 | return 0; | |
8c9e80ed | 1230 | |
9f50eda2 SF |
1231 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED) { |
1232 | if (smk_of_inode(inode) != sbsp->smk_root) | |
1233 | return -EACCES; | |
1234 | } | |
1235 | ||
8c9e80ed | 1236 | /* May be droppable after audit */ |
e74f71eb | 1237 | if (no_block) |
8c9e80ed | 1238 | return -ECHILD; |
f48b7399 | 1239 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f | 1240 | smk_ad_setfield_u_fs_inode(&ad, inode); |
d166c802 CS |
1241 | rc = smk_curacc(smk_of_inode(inode), mask, &ad); |
1242 | rc = smk_bu_inode(inode, mask, rc); | |
1243 | return rc; | |
e114e473 CS |
1244 | } |
1245 | ||
1246 | /** | |
1247 | * smack_inode_setattr - Smack check for setting attributes | |
1248 | * @dentry: the object | |
1249 | * @iattr: for the force flag | |
1250 | * | |
1251 | * Returns 0 if access is permitted, an error code otherwise | |
1252 | */ | |
1253 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
1254 | { | |
ecfcc53f | 1255 | struct smk_audit_info ad; |
d166c802 CS |
1256 | int rc; |
1257 | ||
e114e473 CS |
1258 | /* |
1259 | * Need to allow for clearing the setuid bit. | |
1260 | */ | |
1261 | if (iattr->ia_valid & ATTR_FORCE) | |
1262 | return 0; | |
a269434d | 1263 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1264 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 1265 | |
c6f493d6 DH |
1266 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1267 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1268 | return rc; |
e114e473 CS |
1269 | } |
1270 | ||
1271 | /** | |
1272 | * smack_inode_getattr - Smack check for getting attributes | |
e95ef49b | 1273 | * @mnt: vfsmount of the object |
e114e473 CS |
1274 | * @dentry: the object |
1275 | * | |
1276 | * Returns 0 if access is permitted, an error code otherwise | |
1277 | */ | |
3f7036a0 | 1278 | static int smack_inode_getattr(const struct path *path) |
e114e473 | 1279 | { |
ecfcc53f | 1280 | struct smk_audit_info ad; |
c6f493d6 | 1281 | struct inode *inode = d_backing_inode(path->dentry); |
d166c802 | 1282 | int rc; |
ecfcc53f | 1283 | |
f48b7399 | 1284 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
3f7036a0 AV |
1285 | smk_ad_setfield_u_fs_path(&ad, *path); |
1286 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); | |
1287 | rc = smk_bu_inode(inode, MAY_READ, rc); | |
d166c802 | 1288 | return rc; |
e114e473 CS |
1289 | } |
1290 | ||
1291 | /** | |
1292 | * smack_inode_setxattr - Smack check for setting xattrs | |
1293 | * @dentry: the object | |
1294 | * @name: name of the attribute | |
e95ef49b LP |
1295 | * @value: value of the attribute |
1296 | * @size: size of the value | |
e114e473 CS |
1297 | * @flags: unused |
1298 | * | |
1299 | * This protects the Smack attribute explicitly. | |
1300 | * | |
1301 | * Returns 0 if access is permitted, an error code otherwise | |
1302 | */ | |
8f0cfa52 DH |
1303 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
1304 | const void *value, size_t size, int flags) | |
e114e473 | 1305 | { |
ecfcc53f | 1306 | struct smk_audit_info ad; |
19760ad0 CS |
1307 | struct smack_known *skp; |
1308 | int check_priv = 0; | |
1309 | int check_import = 0; | |
1310 | int check_star = 0; | |
bcdca225 | 1311 | int rc = 0; |
e114e473 | 1312 | |
19760ad0 CS |
1313 | /* |
1314 | * Check label validity here so import won't fail in post_setxattr | |
1315 | */ | |
bcdca225 CS |
1316 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1317 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
1318 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
1319 | check_priv = 1; | |
1320 | check_import = 1; | |
1321 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
1322 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
1323 | check_priv = 1; | |
1324 | check_import = 1; | |
1325 | check_star = 1; | |
5c6d1125 | 1326 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 1327 | check_priv = 1; |
5c6d1125 JS |
1328 | if (size != TRANS_TRUE_SIZE || |
1329 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
1330 | rc = -EINVAL; | |
bcdca225 CS |
1331 | } else |
1332 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
1333 | ||
19760ad0 CS |
1334 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
1335 | rc = -EPERM; | |
1336 | ||
1337 | if (rc == 0 && check_import) { | |
b862e561 | 1338 | skp = size ? smk_import_entry(value, size) : NULL; |
e774ad68 LP |
1339 | if (IS_ERR(skp)) |
1340 | rc = PTR_ERR(skp); | |
1341 | else if (skp == NULL || (check_star && | |
19760ad0 CS |
1342 | (skp == &smack_known_star || skp == &smack_known_web))) |
1343 | rc = -EINVAL; | |
1344 | } | |
1345 | ||
a269434d | 1346 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1347 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1348 | ||
d166c802 | 1349 | if (rc == 0) { |
c6f493d6 DH |
1350 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1351 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1352 | } |
bcdca225 CS |
1353 | |
1354 | return rc; | |
e114e473 CS |
1355 | } |
1356 | ||
1357 | /** | |
1358 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
1359 | * @dentry: object | |
1360 | * @name: attribute name | |
1361 | * @value: attribute value | |
1362 | * @size: attribute size | |
1363 | * @flags: unused | |
1364 | * | |
1365 | * Set the pointer in the inode blob to the entry found | |
1366 | * in the master label list. | |
1367 | */ | |
8f0cfa52 DH |
1368 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
1369 | const void *value, size_t size, int flags) | |
e114e473 | 1370 | { |
2f823ff8 | 1371 | struct smack_known *skp; |
c6f493d6 | 1372 | struct inode_smack *isp = d_backing_inode(dentry)->i_security; |
676dac4b | 1373 | |
2f823ff8 CS |
1374 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
1375 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
1376 | return; | |
1377 | } | |
1378 | ||
676dac4b | 1379 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
9598f4c9 | 1380 | skp = smk_import_entry(value, size); |
e774ad68 | 1381 | if (!IS_ERR(skp)) |
21c7eae2 | 1382 | isp->smk_inode = skp; |
5c6d1125 | 1383 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
9598f4c9 | 1384 | skp = smk_import_entry(value, size); |
e774ad68 | 1385 | if (!IS_ERR(skp)) |
2f823ff8 | 1386 | isp->smk_task = skp; |
7898e1f8 | 1387 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
9598f4c9 | 1388 | skp = smk_import_entry(value, size); |
e774ad68 | 1389 | if (!IS_ERR(skp)) |
2f823ff8 | 1390 | isp->smk_mmap = skp; |
2f823ff8 | 1391 | } |
e114e473 CS |
1392 | |
1393 | return; | |
1394 | } | |
1395 | ||
ce8a4321 | 1396 | /** |
e114e473 CS |
1397 | * smack_inode_getxattr - Smack check on getxattr |
1398 | * @dentry: the object | |
1399 | * @name: unused | |
1400 | * | |
1401 | * Returns 0 if access is permitted, an error code otherwise | |
1402 | */ | |
8f0cfa52 | 1403 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 1404 | { |
ecfcc53f | 1405 | struct smk_audit_info ad; |
d166c802 | 1406 | int rc; |
ecfcc53f | 1407 | |
a269434d | 1408 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1409 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1410 | ||
c6f493d6 DH |
1411 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad); |
1412 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc); | |
d166c802 | 1413 | return rc; |
e114e473 CS |
1414 | } |
1415 | ||
ce8a4321 | 1416 | /** |
e114e473 CS |
1417 | * smack_inode_removexattr - Smack check on removexattr |
1418 | * @dentry: the object | |
1419 | * @name: name of the attribute | |
1420 | * | |
1421 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
1422 | * | |
1423 | * Returns 0 if access is permitted, an error code otherwise | |
1424 | */ | |
8f0cfa52 | 1425 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 1426 | { |
676dac4b | 1427 | struct inode_smack *isp; |
ecfcc53f | 1428 | struct smk_audit_info ad; |
bcdca225 | 1429 | int rc = 0; |
e114e473 | 1430 | |
bcdca225 CS |
1431 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1432 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 1433 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 1434 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 | 1435 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
5e9ab593 | 1436 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
1880eff7 | 1437 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
1438 | rc = -EPERM; |
1439 | } else | |
1440 | rc = cap_inode_removexattr(dentry, name); | |
1441 | ||
f59bdfba CS |
1442 | if (rc != 0) |
1443 | return rc; | |
1444 | ||
a269434d | 1445 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1446 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 1447 | |
c6f493d6 DH |
1448 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1449 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
f59bdfba CS |
1450 | if (rc != 0) |
1451 | return rc; | |
1452 | ||
c6f493d6 | 1453 | isp = d_backing_inode(dentry)->i_security; |
f59bdfba CS |
1454 | /* |
1455 | * Don't do anything special for these. | |
1456 | * XATTR_NAME_SMACKIPIN | |
1457 | * XATTR_NAME_SMACKIPOUT | |
f59bdfba | 1458 | */ |
8012495e | 1459 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
fc64005c | 1460 | struct super_block *sbp = dentry->d_sb; |
8012495e JB |
1461 | struct superblock_smack *sbsp = sbp->s_security; |
1462 | ||
1463 | isp->smk_inode = sbsp->smk_default; | |
1464 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) | |
676dac4b | 1465 | isp->smk_task = NULL; |
f59bdfba | 1466 | else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) |
7898e1f8 | 1467 | isp->smk_mmap = NULL; |
f59bdfba CS |
1468 | else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
1469 | isp->smk_flags &= ~SMK_INODE_TRANSMUTE; | |
676dac4b | 1470 | |
f59bdfba | 1471 | return 0; |
e114e473 CS |
1472 | } |
1473 | ||
1474 | /** | |
1475 | * smack_inode_getsecurity - get smack xattrs | |
1476 | * @inode: the object | |
1477 | * @name: attribute name | |
1478 | * @buffer: where to put the result | |
57e7ba04 | 1479 | * @alloc: duplicate memory |
e114e473 CS |
1480 | * |
1481 | * Returns the size of the attribute or an error code | |
1482 | */ | |
ea861dfd | 1483 | static int smack_inode_getsecurity(struct inode *inode, |
e114e473 CS |
1484 | const char *name, void **buffer, |
1485 | bool alloc) | |
1486 | { | |
1487 | struct socket_smack *ssp; | |
1488 | struct socket *sock; | |
1489 | struct super_block *sbp; | |
1490 | struct inode *ip = (struct inode *)inode; | |
21c7eae2 | 1491 | struct smack_known *isp; |
e114e473 | 1492 | |
57e7ba04 | 1493 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) |
e114e473 | 1494 | isp = smk_of_inode(inode); |
57e7ba04 CS |
1495 | else { |
1496 | /* | |
1497 | * The rest of the Smack xattrs are only on sockets. | |
1498 | */ | |
1499 | sbp = ip->i_sb; | |
1500 | if (sbp->s_magic != SOCKFS_MAGIC) | |
1501 | return -EOPNOTSUPP; | |
e114e473 | 1502 | |
57e7ba04 CS |
1503 | sock = SOCKET_I(ip); |
1504 | if (sock == NULL || sock->sk == NULL) | |
1505 | return -EOPNOTSUPP; | |
e114e473 | 1506 | |
57e7ba04 | 1507 | ssp = sock->sk->sk_security; |
e114e473 | 1508 | |
57e7ba04 CS |
1509 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) |
1510 | isp = ssp->smk_in; | |
1511 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
1512 | isp = ssp->smk_out; | |
1513 | else | |
1514 | return -EOPNOTSUPP; | |
1515 | } | |
e114e473 | 1516 | |
57e7ba04 CS |
1517 | if (alloc) { |
1518 | *buffer = kstrdup(isp->smk_known, GFP_KERNEL); | |
1519 | if (*buffer == NULL) | |
1520 | return -ENOMEM; | |
e114e473 CS |
1521 | } |
1522 | ||
57e7ba04 | 1523 | return strlen(isp->smk_known); |
e114e473 CS |
1524 | } |
1525 | ||
1526 | ||
1527 | /** | |
1528 | * smack_inode_listsecurity - list the Smack attributes | |
1529 | * @inode: the object | |
1530 | * @buffer: where they go | |
1531 | * @buffer_size: size of buffer | |
e114e473 CS |
1532 | */ |
1533 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1534 | size_t buffer_size) | |
1535 | { | |
fd5c9d23 | 1536 | int len = sizeof(XATTR_NAME_SMACK); |
e114e473 | 1537 | |
fd5c9d23 | 1538 | if (buffer != NULL && len <= buffer_size) |
e114e473 | 1539 | memcpy(buffer, XATTR_NAME_SMACK, len); |
fd5c9d23 KK |
1540 | |
1541 | return len; | |
e114e473 CS |
1542 | } |
1543 | ||
d20bdda6 AD |
1544 | /** |
1545 | * smack_inode_getsecid - Extract inode's security id | |
1546 | * @inode: inode to extract the info from | |
1547 | * @secid: where result will be saved | |
1548 | */ | |
d6335d77 | 1549 | static void smack_inode_getsecid(struct inode *inode, u32 *secid) |
d20bdda6 | 1550 | { |
0f8983cf | 1551 | struct smack_known *skp = smk_of_inode(inode); |
d20bdda6 | 1552 | |
0f8983cf | 1553 | *secid = skp->smk_secid; |
d20bdda6 AD |
1554 | } |
1555 | ||
e114e473 CS |
1556 | /* |
1557 | * File Hooks | |
1558 | */ | |
1559 | ||
491a0b08 CS |
1560 | /* |
1561 | * There is no smack_file_permission hook | |
e114e473 CS |
1562 | * |
1563 | * Should access checks be done on each read or write? | |
1564 | * UNICOS and SELinux say yes. | |
1565 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1566 | * | |
1567 | * I'll say no for now. Smack does not do the frequent | |
1568 | * label changing that SELinux does. | |
1569 | */ | |
e114e473 CS |
1570 | |
1571 | /** | |
1572 | * smack_file_alloc_security - assign a file security blob | |
1573 | * @file: the object | |
1574 | * | |
1575 | * The security blob for a file is a pointer to the master | |
1576 | * label list, so no allocation is done. | |
1577 | * | |
5e7270a6 CS |
1578 | * f_security is the owner security information. It |
1579 | * isn't used on file access checks, it's for send_sigio. | |
1580 | * | |
e114e473 CS |
1581 | * Returns 0 |
1582 | */ | |
1583 | static int smack_file_alloc_security(struct file *file) | |
1584 | { | |
2f823ff8 CS |
1585 | struct smack_known *skp = smk_of_current(); |
1586 | ||
21c7eae2 | 1587 | file->f_security = skp; |
e114e473 CS |
1588 | return 0; |
1589 | } | |
1590 | ||
1591 | /** | |
1592 | * smack_file_free_security - clear a file security blob | |
1593 | * @file: the object | |
1594 | * | |
1595 | * The security blob for a file is a pointer to the master | |
1596 | * label list, so no memory is freed. | |
1597 | */ | |
1598 | static void smack_file_free_security(struct file *file) | |
1599 | { | |
1600 | file->f_security = NULL; | |
1601 | } | |
1602 | ||
1603 | /** | |
1604 | * smack_file_ioctl - Smack check on ioctls | |
1605 | * @file: the object | |
1606 | * @cmd: what to do | |
1607 | * @arg: unused | |
1608 | * | |
1609 | * Relies heavily on the correct use of the ioctl command conventions. | |
1610 | * | |
1611 | * Returns 0 if allowed, error code otherwise | |
1612 | */ | |
1613 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1614 | unsigned long arg) | |
1615 | { | |
1616 | int rc = 0; | |
ecfcc53f | 1617 | struct smk_audit_info ad; |
5e7270a6 | 1618 | struct inode *inode = file_inode(file); |
ecfcc53f | 1619 | |
83a1e53f SWK |
1620 | if (unlikely(IS_PRIVATE(inode))) |
1621 | return 0; | |
1622 | ||
f48b7399 | 1623 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1624 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 | 1625 | |
d166c802 | 1626 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
5e7270a6 | 1627 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 CS |
1628 | rc = smk_bu_file(file, MAY_WRITE, rc); |
1629 | } | |
e114e473 | 1630 | |
d166c802 | 1631 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) { |
5e7270a6 | 1632 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); |
d166c802 CS |
1633 | rc = smk_bu_file(file, MAY_READ, rc); |
1634 | } | |
e114e473 CS |
1635 | |
1636 | return rc; | |
1637 | } | |
1638 | ||
1639 | /** | |
1640 | * smack_file_lock - Smack check on file locking | |
1641 | * @file: the object | |
251a2a95 | 1642 | * @cmd: unused |
e114e473 | 1643 | * |
c0ab6e56 | 1644 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1645 | */ |
1646 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1647 | { | |
ecfcc53f | 1648 | struct smk_audit_info ad; |
d166c802 | 1649 | int rc; |
5e7270a6 | 1650 | struct inode *inode = file_inode(file); |
ecfcc53f | 1651 | |
83a1e53f SWK |
1652 | if (unlikely(IS_PRIVATE(inode))) |
1653 | return 0; | |
1654 | ||
92f42509 EP |
1655 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1656 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1657 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 CS |
1658 | rc = smk_bu_file(file, MAY_LOCK, rc); |
1659 | return rc; | |
e114e473 CS |
1660 | } |
1661 | ||
1662 | /** | |
1663 | * smack_file_fcntl - Smack check on fcntl | |
1664 | * @file: the object | |
1665 | * @cmd: what action to check | |
1666 | * @arg: unused | |
1667 | * | |
531f1d45 CS |
1668 | * Generally these operations are harmless. |
1669 | * File locking operations present an obvious mechanism | |
1670 | * for passing information, so they require write access. | |
1671 | * | |
e114e473 CS |
1672 | * Returns 0 if current has access, error code otherwise |
1673 | */ | |
1674 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1675 | unsigned long arg) | |
1676 | { | |
ecfcc53f | 1677 | struct smk_audit_info ad; |
531f1d45 | 1678 | int rc = 0; |
5e7270a6 | 1679 | struct inode *inode = file_inode(file); |
ecfcc53f | 1680 | |
83a1e53f SWK |
1681 | if (unlikely(IS_PRIVATE(inode))) |
1682 | return 0; | |
1683 | ||
e114e473 | 1684 | switch (cmd) { |
e114e473 | 1685 | case F_GETLK: |
c0ab6e56 | 1686 | break; |
e114e473 CS |
1687 | case F_SETLK: |
1688 | case F_SETLKW: | |
c0ab6e56 CS |
1689 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1690 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1691 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 | 1692 | rc = smk_bu_file(file, MAY_LOCK, rc); |
c0ab6e56 | 1693 | break; |
e114e473 CS |
1694 | case F_SETOWN: |
1695 | case F_SETSIG: | |
531f1d45 CS |
1696 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1697 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1698 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 | 1699 | rc = smk_bu_file(file, MAY_WRITE, rc); |
e114e473 CS |
1700 | break; |
1701 | default: | |
531f1d45 | 1702 | break; |
e114e473 CS |
1703 | } |
1704 | ||
1705 | return rc; | |
1706 | } | |
1707 | ||
7898e1f8 | 1708 | /** |
e5467859 | 1709 | * smack_mmap_file : |
7898e1f8 CS |
1710 | * Check permissions for a mmap operation. The @file may be NULL, e.g. |
1711 | * if mapping anonymous memory. | |
1712 | * @file contains the file structure for file to map (may be NULL). | |
1713 | * @reqprot contains the protection requested by the application. | |
1714 | * @prot contains the protection that will be applied by the kernel. | |
1715 | * @flags contains the operational flags. | |
1716 | * Return 0 if permission is granted. | |
1717 | */ | |
e5467859 | 1718 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1719 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1720 | unsigned long flags) |
7898e1f8 | 1721 | { |
272cd7a8 | 1722 | struct smack_known *skp; |
2f823ff8 | 1723 | struct smack_known *mkp; |
7898e1f8 CS |
1724 | struct smack_rule *srp; |
1725 | struct task_smack *tsp; | |
21c7eae2 | 1726 | struct smack_known *okp; |
7898e1f8 | 1727 | struct inode_smack *isp; |
809c02e0 | 1728 | struct superblock_smack *sbsp; |
0e0a070d CS |
1729 | int may; |
1730 | int mmay; | |
1731 | int tmay; | |
7898e1f8 CS |
1732 | int rc; |
1733 | ||
496ad9aa | 1734 | if (file == NULL) |
7898e1f8 CS |
1735 | return 0; |
1736 | ||
83a1e53f SWK |
1737 | if (unlikely(IS_PRIVATE(file_inode(file)))) |
1738 | return 0; | |
1739 | ||
496ad9aa | 1740 | isp = file_inode(file)->i_security; |
7898e1f8 CS |
1741 | if (isp->smk_mmap == NULL) |
1742 | return 0; | |
809c02e0 SF |
1743 | sbsp = file_inode(file)->i_sb->s_security; |
1744 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED && | |
1745 | isp->smk_mmap != sbsp->smk_root) | |
1746 | return -EACCES; | |
2f823ff8 | 1747 | mkp = isp->smk_mmap; |
7898e1f8 CS |
1748 | |
1749 | tsp = current_security(); | |
2f823ff8 | 1750 | skp = smk_of_current(); |
7898e1f8 CS |
1751 | rc = 0; |
1752 | ||
1753 | rcu_read_lock(); | |
1754 | /* | |
1755 | * For each Smack rule associated with the subject | |
1756 | * label verify that the SMACK64MMAP also has access | |
1757 | * to that rule's object label. | |
7898e1f8 | 1758 | */ |
272cd7a8 | 1759 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
21c7eae2 | 1760 | okp = srp->smk_object; |
7898e1f8 CS |
1761 | /* |
1762 | * Matching labels always allows access. | |
1763 | */ | |
21c7eae2 | 1764 | if (mkp->smk_known == okp->smk_known) |
7898e1f8 | 1765 | continue; |
0e0a070d CS |
1766 | /* |
1767 | * If there is a matching local rule take | |
1768 | * that into account as well. | |
1769 | */ | |
21c7eae2 LP |
1770 | may = smk_access_entry(srp->smk_subject->smk_known, |
1771 | okp->smk_known, | |
1772 | &tsp->smk_rules); | |
0e0a070d CS |
1773 | if (may == -ENOENT) |
1774 | may = srp->smk_access; | |
1775 | else | |
1776 | may &= srp->smk_access; | |
1777 | /* | |
1778 | * If may is zero the SMACK64MMAP subject can't | |
1779 | * possibly have less access. | |
1780 | */ | |
1781 | if (may == 0) | |
1782 | continue; | |
1783 | ||
1784 | /* | |
1785 | * Fetch the global list entry. | |
1786 | * If there isn't one a SMACK64MMAP subject | |
1787 | * can't have as much access as current. | |
1788 | */ | |
21c7eae2 LP |
1789 | mmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1790 | &mkp->smk_rules); | |
0e0a070d CS |
1791 | if (mmay == -ENOENT) { |
1792 | rc = -EACCES; | |
1793 | break; | |
1794 | } | |
1795 | /* | |
1796 | * If there is a local entry it modifies the | |
1797 | * potential access, too. | |
1798 | */ | |
21c7eae2 LP |
1799 | tmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1800 | &tsp->smk_rules); | |
0e0a070d CS |
1801 | if (tmay != -ENOENT) |
1802 | mmay &= tmay; | |
7898e1f8 | 1803 | |
0e0a070d CS |
1804 | /* |
1805 | * If there is any access available to current that is | |
1806 | * not available to a SMACK64MMAP subject | |
1807 | * deny access. | |
1808 | */ | |
75a25637 | 1809 | if ((may | mmay) != mmay) { |
0e0a070d | 1810 | rc = -EACCES; |
7898e1f8 | 1811 | break; |
0e0a070d | 1812 | } |
7898e1f8 CS |
1813 | } |
1814 | ||
1815 | rcu_read_unlock(); | |
1816 | ||
1817 | return rc; | |
1818 | } | |
1819 | ||
e114e473 CS |
1820 | /** |
1821 | * smack_file_set_fowner - set the file security blob value | |
1822 | * @file: object in question | |
1823 | * | |
e114e473 | 1824 | */ |
e0b93edd | 1825 | static void smack_file_set_fowner(struct file *file) |
e114e473 | 1826 | { |
5e7270a6 | 1827 | file->f_security = smk_of_current(); |
e114e473 CS |
1828 | } |
1829 | ||
1830 | /** | |
1831 | * smack_file_send_sigiotask - Smack on sigio | |
1832 | * @tsk: The target task | |
1833 | * @fown: the object the signal come from | |
1834 | * @signum: unused | |
1835 | * | |
1836 | * Allow a privileged task to get signals even if it shouldn't | |
1837 | * | |
1838 | * Returns 0 if a subject with the object's smack could | |
1839 | * write to the task, an error code otherwise. | |
1840 | */ | |
1841 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1842 | struct fown_struct *fown, int signum) | |
1843 | { | |
2f823ff8 CS |
1844 | struct smack_known *skp; |
1845 | struct smack_known *tkp = smk_of_task(tsk->cred->security); | |
dcb569cf | 1846 | const struct cred *tcred; |
e114e473 CS |
1847 | struct file *file; |
1848 | int rc; | |
ecfcc53f | 1849 | struct smk_audit_info ad; |
e114e473 CS |
1850 | |
1851 | /* | |
1852 | * struct fown_struct is never outside the context of a struct file | |
1853 | */ | |
1854 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1855 | |
ecfcc53f | 1856 | /* we don't log here as rc can be overriden */ |
21c7eae2 | 1857 | skp = file->f_security; |
c60b9066 CS |
1858 | rc = smk_access(skp, tkp, MAY_DELIVER, NULL); |
1859 | rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc); | |
dcb569cf CS |
1860 | |
1861 | rcu_read_lock(); | |
1862 | tcred = __task_cred(tsk); | |
1863 | if (rc != 0 && smack_privileged_cred(CAP_MAC_OVERRIDE, tcred)) | |
ecfcc53f | 1864 | rc = 0; |
dcb569cf | 1865 | rcu_read_unlock(); |
ecfcc53f EB |
1866 | |
1867 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1868 | smk_ad_setfield_u_tsk(&ad, tsk); | |
c60b9066 | 1869 | smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad); |
e114e473 CS |
1870 | return rc; |
1871 | } | |
1872 | ||
1873 | /** | |
1874 | * smack_file_receive - Smack file receive check | |
1875 | * @file: the object | |
1876 | * | |
1877 | * Returns 0 if current has access, error code otherwise | |
1878 | */ | |
1879 | static int smack_file_receive(struct file *file) | |
1880 | { | |
d166c802 | 1881 | int rc; |
e114e473 | 1882 | int may = 0; |
ecfcc53f | 1883 | struct smk_audit_info ad; |
5e7270a6 | 1884 | struct inode *inode = file_inode(file); |
79be0935 CS |
1885 | struct socket *sock; |
1886 | struct task_smack *tsp; | |
1887 | struct socket_smack *ssp; | |
e114e473 | 1888 | |
9777582e SWK |
1889 | if (unlikely(IS_PRIVATE(inode))) |
1890 | return 0; | |
1891 | ||
4482a44f | 1892 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1893 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
79be0935 | 1894 | |
51d59af2 | 1895 | if (inode->i_sb->s_magic == SOCKFS_MAGIC) { |
79be0935 CS |
1896 | sock = SOCKET_I(inode); |
1897 | ssp = sock->sk->sk_security; | |
1898 | tsp = current_security(); | |
1899 | /* | |
1900 | * If the receiving process can't write to the | |
1901 | * passed socket or if the passed socket can't | |
1902 | * write to the receiving process don't accept | |
1903 | * the passed socket. | |
1904 | */ | |
1905 | rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad); | |
1906 | rc = smk_bu_file(file, may, rc); | |
1907 | if (rc < 0) | |
1908 | return rc; | |
1909 | rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad); | |
1910 | rc = smk_bu_file(file, may, rc); | |
1911 | return rc; | |
1912 | } | |
e114e473 CS |
1913 | /* |
1914 | * This code relies on bitmasks. | |
1915 | */ | |
1916 | if (file->f_mode & FMODE_READ) | |
1917 | may = MAY_READ; | |
1918 | if (file->f_mode & FMODE_WRITE) | |
1919 | may |= MAY_WRITE; | |
1920 | ||
5e7270a6 | 1921 | rc = smk_curacc(smk_of_inode(inode), may, &ad); |
d166c802 CS |
1922 | rc = smk_bu_file(file, may, rc); |
1923 | return rc; | |
e114e473 CS |
1924 | } |
1925 | ||
531f1d45 | 1926 | /** |
83d49856 | 1927 | * smack_file_open - Smack dentry open processing |
531f1d45 | 1928 | * @file: the object |
a6834c0b | 1929 | * @cred: task credential |
531f1d45 CS |
1930 | * |
1931 | * Set the security blob in the file structure. | |
a6834c0b CS |
1932 | * Allow the open only if the task has read access. There are |
1933 | * many read operations (e.g. fstat) that you can do with an | |
1934 | * fd even if you have the file open write-only. | |
531f1d45 CS |
1935 | * |
1936 | * Returns 0 | |
1937 | */ | |
94817692 | 1938 | static int smack_file_open(struct file *file) |
531f1d45 | 1939 | { |
94817692 | 1940 | struct task_smack *tsp = file->f_cred->security; |
5e7270a6 | 1941 | struct inode *inode = file_inode(file); |
a6834c0b CS |
1942 | struct smk_audit_info ad; |
1943 | int rc; | |
531f1d45 | 1944 | |
a6834c0b CS |
1945 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1946 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
c9d238a1 | 1947 | rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad); |
94817692 | 1948 | rc = smk_bu_credfile(file->f_cred, file, MAY_READ, rc); |
a6834c0b CS |
1949 | |
1950 | return rc; | |
531f1d45 CS |
1951 | } |
1952 | ||
e114e473 CS |
1953 | /* |
1954 | * Task hooks | |
1955 | */ | |
1956 | ||
ee18d64c DH |
1957 | /** |
1958 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1959 | * @new: the new credentials | |
1960 | * @gfp: the atomicity of any memory allocations | |
1961 | * | |
1962 | * Prepare a blank set of credentials for modification. This must allocate all | |
1963 | * the memory the LSM module might require such that cred_transfer() can | |
1964 | * complete without error. | |
1965 | */ | |
1966 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1967 | { | |
7898e1f8 CS |
1968 | struct task_smack *tsp; |
1969 | ||
1970 | tsp = new_task_smack(NULL, NULL, gfp); | |
1971 | if (tsp == NULL) | |
676dac4b | 1972 | return -ENOMEM; |
7898e1f8 CS |
1973 | |
1974 | cred->security = tsp; | |
1975 | ||
ee18d64c DH |
1976 | return 0; |
1977 | } | |
1978 | ||
1979 | ||
e114e473 | 1980 | /** |
f1752eec DH |
1981 | * smack_cred_free - "free" task-level security credentials |
1982 | * @cred: the credentials in question | |
e114e473 | 1983 | * |
e114e473 | 1984 | */ |
f1752eec | 1985 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1986 | { |
7898e1f8 CS |
1987 | struct task_smack *tsp = cred->security; |
1988 | struct smack_rule *rp; | |
1989 | struct list_head *l; | |
1990 | struct list_head *n; | |
1991 | ||
1992 | if (tsp == NULL) | |
1993 | return; | |
1994 | cred->security = NULL; | |
1995 | ||
38416e53 ZJ |
1996 | smk_destroy_label_list(&tsp->smk_relabel); |
1997 | ||
7898e1f8 CS |
1998 | list_for_each_safe(l, n, &tsp->smk_rules) { |
1999 | rp = list_entry(l, struct smack_rule, list); | |
2000 | list_del(&rp->list); | |
2001 | kfree(rp); | |
2002 | } | |
2003 | kfree(tsp); | |
e114e473 CS |
2004 | } |
2005 | ||
d84f4f99 DH |
2006 | /** |
2007 | * smack_cred_prepare - prepare new set of credentials for modification | |
2008 | * @new: the new credentials | |
2009 | * @old: the original credentials | |
2010 | * @gfp: the atomicity of any memory allocations | |
2011 | * | |
2012 | * Prepare a new set of credentials for modification. | |
2013 | */ | |
2014 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
2015 | gfp_t gfp) | |
2016 | { | |
676dac4b CS |
2017 | struct task_smack *old_tsp = old->security; |
2018 | struct task_smack *new_tsp; | |
7898e1f8 | 2019 | int rc; |
676dac4b | 2020 | |
7898e1f8 | 2021 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
2022 | if (new_tsp == NULL) |
2023 | return -ENOMEM; | |
2024 | ||
b437aba8 HS |
2025 | new->security = new_tsp; |
2026 | ||
7898e1f8 CS |
2027 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
2028 | if (rc != 0) | |
2029 | return rc; | |
2030 | ||
38416e53 ZJ |
2031 | rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel, |
2032 | gfp); | |
2033 | if (rc != 0) | |
2034 | return rc; | |
2035 | ||
d84f4f99 DH |
2036 | return 0; |
2037 | } | |
2038 | ||
ee18d64c DH |
2039 | /** |
2040 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
2041 | * @new: the new credentials | |
2042 | * @old: the original credentials | |
2043 | * | |
2044 | * Fill in a set of blank credentials from another set of credentials. | |
2045 | */ | |
2046 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
2047 | { | |
676dac4b CS |
2048 | struct task_smack *old_tsp = old->security; |
2049 | struct task_smack *new_tsp = new->security; | |
2050 | ||
2051 | new_tsp->smk_task = old_tsp->smk_task; | |
2052 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
2053 | mutex_init(&new_tsp->smk_rules_lock); |
2054 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
2055 | ||
2056 | ||
2057 | /* cbs copy rule list */ | |
ee18d64c DH |
2058 | } |
2059 | ||
3ec30113 MG |
2060 | /** |
2061 | * smack_cred_getsecid - get the secid corresponding to a creds structure | |
2062 | * @c: the object creds | |
2063 | * @secid: where to put the result | |
2064 | * | |
2065 | * Sets the secid to contain a u32 version of the smack label. | |
2066 | */ | |
2067 | static void smack_cred_getsecid(const struct cred *c, u32 *secid) | |
2068 | { | |
2069 | struct smack_known *skp; | |
2070 | ||
2071 | rcu_read_lock(); | |
2072 | skp = smk_of_task(c->security); | |
2073 | *secid = skp->smk_secid; | |
2074 | rcu_read_unlock(); | |
2075 | } | |
2076 | ||
3a3b7ce9 DH |
2077 | /** |
2078 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
2079 | * @new: points to the set of credentials to be modified. |
2080 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
2081 | * |
2082 | * Set the security data for a kernel service. | |
2083 | */ | |
2084 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
2085 | { | |
676dac4b | 2086 | struct task_smack *new_tsp = new->security; |
3a3b7ce9 | 2087 | |
152f91d4 | 2088 | new_tsp->smk_task = smack_from_secid(secid); |
3a3b7ce9 DH |
2089 | return 0; |
2090 | } | |
2091 | ||
2092 | /** | |
2093 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
2094 | * @new: points to the set of credentials to be modified |
2095 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
2096 | * |
2097 | * Set the file creation context in a set of credentials to the same | |
2098 | * as the objective context of the specified inode | |
2099 | */ | |
2100 | static int smack_kernel_create_files_as(struct cred *new, | |
2101 | struct inode *inode) | |
2102 | { | |
2103 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 2104 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 2105 | |
21c7eae2 | 2106 | tsp->smk_forked = isp->smk_inode; |
2f823ff8 | 2107 | tsp->smk_task = tsp->smk_forked; |
3a3b7ce9 DH |
2108 | return 0; |
2109 | } | |
2110 | ||
ecfcc53f EB |
2111 | /** |
2112 | * smk_curacc_on_task - helper to log task related access | |
2113 | * @p: the task object | |
531f1d45 CS |
2114 | * @access: the access requested |
2115 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
2116 | * |
2117 | * Return 0 if access is permitted | |
2118 | */ | |
531f1d45 CS |
2119 | static int smk_curacc_on_task(struct task_struct *p, int access, |
2120 | const char *caller) | |
ecfcc53f EB |
2121 | { |
2122 | struct smk_audit_info ad; | |
6d1cff2a | 2123 | struct smack_known *skp = smk_of_task_struct(p); |
d166c802 | 2124 | int rc; |
ecfcc53f | 2125 | |
531f1d45 | 2126 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 2127 | smk_ad_setfield_u_tsk(&ad, p); |
21c7eae2 | 2128 | rc = smk_curacc(skp, access, &ad); |
d166c802 CS |
2129 | rc = smk_bu_task(p, access, rc); |
2130 | return rc; | |
ecfcc53f EB |
2131 | } |
2132 | ||
e114e473 CS |
2133 | /** |
2134 | * smack_task_setpgid - Smack check on setting pgid | |
2135 | * @p: the task object | |
2136 | * @pgid: unused | |
2137 | * | |
2138 | * Return 0 if write access is permitted | |
2139 | */ | |
2140 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
2141 | { | |
531f1d45 | 2142 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2143 | } |
2144 | ||
2145 | /** | |
2146 | * smack_task_getpgid - Smack access check for getpgid | |
2147 | * @p: the object task | |
2148 | * | |
2149 | * Returns 0 if current can read the object task, error code otherwise | |
2150 | */ | |
2151 | static int smack_task_getpgid(struct task_struct *p) | |
2152 | { | |
531f1d45 | 2153 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2154 | } |
2155 | ||
2156 | /** | |
2157 | * smack_task_getsid - Smack access check for getsid | |
2158 | * @p: the object task | |
2159 | * | |
2160 | * Returns 0 if current can read the object task, error code otherwise | |
2161 | */ | |
2162 | static int smack_task_getsid(struct task_struct *p) | |
2163 | { | |
531f1d45 | 2164 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2165 | } |
2166 | ||
2167 | /** | |
2168 | * smack_task_getsecid - get the secid of the task | |
2169 | * @p: the object task | |
2170 | * @secid: where to put the result | |
2171 | * | |
2172 | * Sets the secid to contain a u32 version of the smack label. | |
2173 | */ | |
2174 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
2175 | { | |
6d1cff2a | 2176 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 CS |
2177 | |
2178 | *secid = skp->smk_secid; | |
e114e473 CS |
2179 | } |
2180 | ||
2181 | /** | |
2182 | * smack_task_setnice - Smack check on setting nice | |
2183 | * @p: the task object | |
2184 | * @nice: unused | |
2185 | * | |
2186 | * Return 0 if write access is permitted | |
2187 | */ | |
2188 | static int smack_task_setnice(struct task_struct *p, int nice) | |
2189 | { | |
b1d9e6b0 | 2190 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2191 | } |
2192 | ||
2193 | /** | |
2194 | * smack_task_setioprio - Smack check on setting ioprio | |
2195 | * @p: the task object | |
2196 | * @ioprio: unused | |
2197 | * | |
2198 | * Return 0 if write access is permitted | |
2199 | */ | |
2200 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
2201 | { | |
b1d9e6b0 | 2202 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2203 | } |
2204 | ||
2205 | /** | |
2206 | * smack_task_getioprio - Smack check on reading ioprio | |
2207 | * @p: the task object | |
2208 | * | |
2209 | * Return 0 if read access is permitted | |
2210 | */ | |
2211 | static int smack_task_getioprio(struct task_struct *p) | |
2212 | { | |
531f1d45 | 2213 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2214 | } |
2215 | ||
2216 | /** | |
2217 | * smack_task_setscheduler - Smack check on setting scheduler | |
2218 | * @p: the task object | |
2219 | * @policy: unused | |
2220 | * @lp: unused | |
2221 | * | |
2222 | * Return 0 if read access is permitted | |
2223 | */ | |
b0ae1981 | 2224 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 2225 | { |
b1d9e6b0 | 2226 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2227 | } |
2228 | ||
2229 | /** | |
2230 | * smack_task_getscheduler - Smack check on reading scheduler | |
2231 | * @p: the task object | |
2232 | * | |
2233 | * Return 0 if read access is permitted | |
2234 | */ | |
2235 | static int smack_task_getscheduler(struct task_struct *p) | |
2236 | { | |
531f1d45 | 2237 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2238 | } |
2239 | ||
2240 | /** | |
2241 | * smack_task_movememory - Smack check on moving memory | |
2242 | * @p: the task object | |
2243 | * | |
2244 | * Return 0 if write access is permitted | |
2245 | */ | |
2246 | static int smack_task_movememory(struct task_struct *p) | |
2247 | { | |
531f1d45 | 2248 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2249 | } |
2250 | ||
2251 | /** | |
2252 | * smack_task_kill - Smack check on signal delivery | |
2253 | * @p: the task object | |
2254 | * @info: unused | |
2255 | * @sig: unused | |
6b4f3d01 | 2256 | * @cred: identifies the cred to use in lieu of current's |
e114e473 CS |
2257 | * |
2258 | * Return 0 if write access is permitted | |
2259 | * | |
e114e473 | 2260 | */ |
ae7795bc | 2261 | static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info, |
6b4f3d01 | 2262 | int sig, const struct cred *cred) |
e114e473 | 2263 | { |
ecfcc53f | 2264 | struct smk_audit_info ad; |
2f823ff8 | 2265 | struct smack_known *skp; |
6d1cff2a | 2266 | struct smack_known *tkp = smk_of_task_struct(p); |
d166c802 | 2267 | int rc; |
ecfcc53f | 2268 | |
18d872f7 RK |
2269 | if (!sig) |
2270 | return 0; /* null signal; existence test */ | |
2271 | ||
ecfcc53f EB |
2272 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
2273 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
2274 | /* |
2275 | * Sending a signal requires that the sender | |
2276 | * can write the receiver. | |
2277 | */ | |
6b4f3d01 | 2278 | if (cred == NULL) { |
c60b9066 CS |
2279 | rc = smk_curacc(tkp, MAY_DELIVER, &ad); |
2280 | rc = smk_bu_task(p, MAY_DELIVER, rc); | |
d166c802 CS |
2281 | return rc; |
2282 | } | |
e114e473 | 2283 | /* |
6b4f3d01 | 2284 | * If the cred isn't NULL we're dealing with some USB IO |
e114e473 CS |
2285 | * specific behavior. This is not clean. For one thing |
2286 | * we can't take privilege into account. | |
2287 | */ | |
6b4f3d01 | 2288 | skp = smk_of_task(cred->security); |
c60b9066 CS |
2289 | rc = smk_access(skp, tkp, MAY_DELIVER, &ad); |
2290 | rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc); | |
d166c802 | 2291 | return rc; |
e114e473 CS |
2292 | } |
2293 | ||
e114e473 CS |
2294 | /** |
2295 | * smack_task_to_inode - copy task smack into the inode blob | |
2296 | * @p: task to copy from | |
251a2a95 | 2297 | * @inode: inode to copy to |
e114e473 CS |
2298 | * |
2299 | * Sets the smack pointer in the inode security blob | |
2300 | */ | |
2301 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
2302 | { | |
2303 | struct inode_smack *isp = inode->i_security; | |
6d1cff2a | 2304 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 | 2305 | |
21c7eae2 | 2306 | isp->smk_inode = skp; |
7b4e8843 | 2307 | isp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2308 | } |
2309 | ||
2310 | /* | |
2311 | * Socket hooks. | |
2312 | */ | |
2313 | ||
2314 | /** | |
2315 | * smack_sk_alloc_security - Allocate a socket blob | |
2316 | * @sk: the socket | |
2317 | * @family: unused | |
251a2a95 | 2318 | * @gfp_flags: memory allocation flags |
e114e473 CS |
2319 | * |
2320 | * Assign Smack pointers to current | |
2321 | * | |
2322 | * Returns 0 on success, -ENOMEM is there's no memory | |
2323 | */ | |
2324 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
2325 | { | |
2f823ff8 | 2326 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
2327 | struct socket_smack *ssp; |
2328 | ||
2329 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
2330 | if (ssp == NULL) | |
2331 | return -ENOMEM; | |
2332 | ||
08382c9f | 2333 | /* |
2334 | * Sockets created by kernel threads receive web label. | |
2335 | */ | |
2336 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2337 | ssp->smk_in = &smack_known_web; | |
2338 | ssp->smk_out = &smack_known_web; | |
2339 | } else { | |
2340 | ssp->smk_in = skp; | |
2341 | ssp->smk_out = skp; | |
2342 | } | |
272cd7a8 | 2343 | ssp->smk_packet = NULL; |
e114e473 CS |
2344 | |
2345 | sk->sk_security = ssp; | |
2346 | ||
2347 | return 0; | |
2348 | } | |
2349 | ||
2350 | /** | |
2351 | * smack_sk_free_security - Free a socket blob | |
2352 | * @sk: the socket | |
2353 | * | |
2354 | * Clears the blob pointer | |
2355 | */ | |
2356 | static void smack_sk_free_security(struct sock *sk) | |
2357 | { | |
0c96d1f5 VG |
2358 | #ifdef SMACK_IPV6_PORT_LABELING |
2359 | struct smk_port_label *spp; | |
2360 | ||
2361 | if (sk->sk_family == PF_INET6) { | |
2362 | rcu_read_lock(); | |
2363 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
2364 | if (spp->smk_sock != sk) | |
2365 | continue; | |
2366 | spp->smk_can_reuse = 1; | |
2367 | break; | |
2368 | } | |
2369 | rcu_read_unlock(); | |
2370 | } | |
2371 | #endif | |
e114e473 CS |
2372 | kfree(sk->sk_security); |
2373 | } | |
2374 | ||
07feee8f | 2375 | /** |
21abb1ec | 2376 | * smack_ipv4host_label - check host based restrictions |
07feee8f PM |
2377 | * @sip: the object end |
2378 | * | |
2379 | * looks for host based access restrictions | |
2380 | * | |
2381 | * This version will only be appropriate for really small sets of single label | |
2382 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2383 | * taken before calling this function. | |
2384 | * | |
2385 | * Returns the label of the far end or NULL if it's not special. | |
2386 | */ | |
21abb1ec | 2387 | static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip) |
07feee8f | 2388 | { |
21abb1ec | 2389 | struct smk_net4addr *snp; |
07feee8f PM |
2390 | struct in_addr *siap = &sip->sin_addr; |
2391 | ||
2392 | if (siap->s_addr == 0) | |
2393 | return NULL; | |
2394 | ||
21abb1ec CS |
2395 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) |
2396 | /* | |
2397 | * we break after finding the first match because | |
2398 | * the list is sorted from longest to shortest mask | |
2399 | * so we have found the most specific match | |
2400 | */ | |
2401 | if (snp->smk_host.s_addr == | |
2402 | (siap->s_addr & snp->smk_mask.s_addr)) | |
2403 | return snp->smk_label; | |
2404 | ||
2405 | return NULL; | |
2406 | } | |
2407 | ||
2408 | #if IS_ENABLED(CONFIG_IPV6) | |
2409 | /* | |
2410 | * smk_ipv6_localhost - Check for local ipv6 host address | |
2411 | * @sip: the address | |
2412 | * | |
2413 | * Returns boolean true if this is the localhost address | |
2414 | */ | |
2415 | static bool smk_ipv6_localhost(struct sockaddr_in6 *sip) | |
2416 | { | |
2417 | __be16 *be16p = (__be16 *)&sip->sin6_addr; | |
2418 | __be32 *be32p = (__be32 *)&sip->sin6_addr; | |
2419 | ||
2420 | if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 && | |
2421 | ntohs(be16p[7]) == 1) | |
2422 | return true; | |
2423 | return false; | |
2424 | } | |
2425 | ||
2426 | /** | |
2427 | * smack_ipv6host_label - check host based restrictions | |
2428 | * @sip: the object end | |
2429 | * | |
2430 | * looks for host based access restrictions | |
2431 | * | |
2432 | * This version will only be appropriate for really small sets of single label | |
2433 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2434 | * taken before calling this function. | |
2435 | * | |
2436 | * Returns the label of the far end or NULL if it's not special. | |
2437 | */ | |
2438 | static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip) | |
2439 | { | |
2440 | struct smk_net6addr *snp; | |
2441 | struct in6_addr *sap = &sip->sin6_addr; | |
2442 | int i; | |
2443 | int found = 0; | |
2444 | ||
2445 | /* | |
2446 | * It's local. Don't look for a host label. | |
2447 | */ | |
2448 | if (smk_ipv6_localhost(sip)) | |
2449 | return NULL; | |
2450 | ||
2451 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
2e4939f7 CS |
2452 | /* |
2453 | * If the label is NULL the entry has | |
2454 | * been renounced. Ignore it. | |
2455 | */ | |
2456 | if (snp->smk_label == NULL) | |
2457 | continue; | |
07feee8f PM |
2458 | /* |
2459 | * we break after finding the first match because | |
2460 | * the list is sorted from longest to shortest mask | |
2461 | * so we have found the most specific match | |
2462 | */ | |
21abb1ec | 2463 | for (found = 1, i = 0; i < 8; i++) { |
21abb1ec CS |
2464 | if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) != |
2465 | snp->smk_host.s6_addr16[i]) { | |
2466 | found = 0; | |
2467 | break; | |
2468 | } | |
4303154e | 2469 | } |
21abb1ec CS |
2470 | if (found) |
2471 | return snp->smk_label; | |
2472 | } | |
07feee8f PM |
2473 | |
2474 | return NULL; | |
2475 | } | |
21abb1ec | 2476 | #endif /* CONFIG_IPV6 */ |
07feee8f | 2477 | |
e114e473 CS |
2478 | /** |
2479 | * smack_netlabel - Set the secattr on a socket | |
2480 | * @sk: the socket | |
6d3dc07c | 2481 | * @labeled: socket label scheme |
e114e473 CS |
2482 | * |
2483 | * Convert the outbound smack value (smk_out) to a | |
2484 | * secattr and attach it to the socket. | |
2485 | * | |
2486 | * Returns 0 on success or an error code | |
2487 | */ | |
6d3dc07c | 2488 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 2489 | { |
f7112e6c | 2490 | struct smack_known *skp; |
07feee8f | 2491 | struct socket_smack *ssp = sk->sk_security; |
6d3dc07c | 2492 | int rc = 0; |
e114e473 | 2493 | |
6d3dc07c CS |
2494 | /* |
2495 | * Usually the netlabel code will handle changing the | |
2496 | * packet labeling based on the label. | |
2497 | * The case of a single label host is different, because | |
2498 | * a single label host should never get a labeled packet | |
2499 | * even though the label is usually associated with a packet | |
2500 | * label. | |
2501 | */ | |
2502 | local_bh_disable(); | |
2503 | bh_lock_sock_nested(sk); | |
2504 | ||
2505 | if (ssp->smk_out == smack_net_ambient || | |
2506 | labeled == SMACK_UNLABELED_SOCKET) | |
2507 | netlbl_sock_delattr(sk); | |
2508 | else { | |
2f823ff8 | 2509 | skp = ssp->smk_out; |
f7112e6c | 2510 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
6d3dc07c CS |
2511 | } |
2512 | ||
2513 | bh_unlock_sock(sk); | |
2514 | local_bh_enable(); | |
4bc87e62 | 2515 | |
e114e473 CS |
2516 | return rc; |
2517 | } | |
2518 | ||
07feee8f PM |
2519 | /** |
2520 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
2521 | * @sk: the socket | |
2522 | * @sap: the destination address | |
2523 | * | |
2524 | * Set the correct secattr for the given socket based on the destination | |
2525 | * address and perform any outbound access checks needed. | |
2526 | * | |
2527 | * Returns 0 on success or an error code. | |
2528 | * | |
2529 | */ | |
2530 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
2531 | { | |
2f823ff8 | 2532 | struct smack_known *skp; |
07feee8f PM |
2533 | int rc; |
2534 | int sk_lbl; | |
21c7eae2 | 2535 | struct smack_known *hkp; |
07feee8f | 2536 | struct socket_smack *ssp = sk->sk_security; |
ecfcc53f | 2537 | struct smk_audit_info ad; |
07feee8f PM |
2538 | |
2539 | rcu_read_lock(); | |
21abb1ec | 2540 | hkp = smack_ipv4host_label(sap); |
21c7eae2 | 2541 | if (hkp != NULL) { |
ecfcc53f | 2542 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
2543 | struct lsm_network_audit net; |
2544 | ||
48c62af6 EP |
2545 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
2546 | ad.a.u.net->family = sap->sin_family; | |
2547 | ad.a.u.net->dport = sap->sin_port; | |
2548 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 2549 | #endif |
923e9a13 | 2550 | sk_lbl = SMACK_UNLABELED_SOCKET; |
2f823ff8 | 2551 | skp = ssp->smk_out; |
21c7eae2 LP |
2552 | rc = smk_access(skp, hkp, MAY_WRITE, &ad); |
2553 | rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc); | |
07feee8f PM |
2554 | } else { |
2555 | sk_lbl = SMACK_CIPSO_SOCKET; | |
2556 | rc = 0; | |
2557 | } | |
2558 | rcu_read_unlock(); | |
2559 | if (rc != 0) | |
2560 | return rc; | |
2561 | ||
2562 | return smack_netlabel(sk, sk_lbl); | |
2563 | } | |
2564 | ||
21abb1ec CS |
2565 | #if IS_ENABLED(CONFIG_IPV6) |
2566 | /** | |
2567 | * smk_ipv6_check - check Smack access | |
2568 | * @subject: subject Smack label | |
2569 | * @object: object Smack label | |
2570 | * @address: address | |
2571 | * @act: the action being taken | |
2572 | * | |
2573 | * Check an IPv6 access | |
2574 | */ | |
2575 | static int smk_ipv6_check(struct smack_known *subject, | |
2576 | struct smack_known *object, | |
2577 | struct sockaddr_in6 *address, int act) | |
2578 | { | |
2579 | #ifdef CONFIG_AUDIT | |
2580 | struct lsm_network_audit net; | |
2581 | #endif | |
2582 | struct smk_audit_info ad; | |
2583 | int rc; | |
2584 | ||
2585 | #ifdef CONFIG_AUDIT | |
2586 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2587 | ad.a.u.net->family = PF_INET6; | |
2588 | ad.a.u.net->dport = ntohs(address->sin6_port); | |
2589 | if (act == SMK_RECEIVING) | |
2590 | ad.a.u.net->v6info.saddr = address->sin6_addr; | |
2591 | else | |
2592 | ad.a.u.net->v6info.daddr = address->sin6_addr; | |
2593 | #endif | |
2594 | rc = smk_access(subject, object, MAY_WRITE, &ad); | |
2595 | rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc); | |
2596 | return rc; | |
2597 | } | |
2598 | #endif /* CONFIG_IPV6 */ | |
2599 | ||
2600 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 CS |
2601 | /** |
2602 | * smk_ipv6_port_label - Smack port access table management | |
2603 | * @sock: socket | |
2604 | * @address: address | |
2605 | * | |
2606 | * Create or update the port list entry | |
2607 | */ | |
2608 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2609 | { | |
2610 | struct sock *sk = sock->sk; | |
2611 | struct sockaddr_in6 *addr6; | |
2612 | struct socket_smack *ssp = sock->sk->sk_security; | |
2613 | struct smk_port_label *spp; | |
2614 | unsigned short port = 0; | |
2615 | ||
2616 | if (address == NULL) { | |
2617 | /* | |
2618 | * This operation is changing the Smack information | |
2619 | * on the bound socket. Take the changes to the port | |
2620 | * as well. | |
2621 | */ | |
3c7ce342 VG |
2622 | rcu_read_lock(); |
2623 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
c6739443 CS |
2624 | if (sk != spp->smk_sock) |
2625 | continue; | |
2626 | spp->smk_in = ssp->smk_in; | |
2627 | spp->smk_out = ssp->smk_out; | |
3c7ce342 | 2628 | rcu_read_unlock(); |
c6739443 CS |
2629 | return; |
2630 | } | |
2631 | /* | |
2632 | * A NULL address is only used for updating existing | |
2633 | * bound entries. If there isn't one, it's OK. | |
2634 | */ | |
3c7ce342 | 2635 | rcu_read_unlock(); |
c6739443 CS |
2636 | return; |
2637 | } | |
2638 | ||
2639 | addr6 = (struct sockaddr_in6 *)address; | |
2640 | port = ntohs(addr6->sin6_port); | |
2641 | /* | |
2642 | * This is a special case that is safely ignored. | |
2643 | */ | |
2644 | if (port == 0) | |
2645 | return; | |
2646 | ||
2647 | /* | |
2648 | * Look for an existing port list entry. | |
2649 | * This is an indication that a port is getting reused. | |
2650 | */ | |
3c7ce342 VG |
2651 | rcu_read_lock(); |
2652 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2653 | if (spp->smk_port != port || spp->smk_sock_type != sock->type) |
c6739443 | 2654 | continue; |
0c96d1f5 VG |
2655 | if (spp->smk_can_reuse != 1) { |
2656 | rcu_read_unlock(); | |
2657 | return; | |
2658 | } | |
c6739443 CS |
2659 | spp->smk_port = port; |
2660 | spp->smk_sock = sk; | |
2661 | spp->smk_in = ssp->smk_in; | |
2662 | spp->smk_out = ssp->smk_out; | |
0c96d1f5 | 2663 | spp->smk_can_reuse = 0; |
3c7ce342 | 2664 | rcu_read_unlock(); |
c6739443 CS |
2665 | return; |
2666 | } | |
3c7ce342 | 2667 | rcu_read_unlock(); |
c6739443 CS |
2668 | /* |
2669 | * A new port entry is required. | |
2670 | */ | |
2671 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2672 | if (spp == NULL) | |
2673 | return; | |
2674 | ||
2675 | spp->smk_port = port; | |
2676 | spp->smk_sock = sk; | |
2677 | spp->smk_in = ssp->smk_in; | |
2678 | spp->smk_out = ssp->smk_out; | |
9d44c973 | 2679 | spp->smk_sock_type = sock->type; |
0c96d1f5 | 2680 | spp->smk_can_reuse = 0; |
c6739443 | 2681 | |
3c7ce342 VG |
2682 | mutex_lock(&smack_ipv6_lock); |
2683 | list_add_rcu(&spp->list, &smk_ipv6_port_list); | |
2684 | mutex_unlock(&smack_ipv6_lock); | |
c6739443 CS |
2685 | return; |
2686 | } | |
2687 | ||
2688 | /** | |
2689 | * smk_ipv6_port_check - check Smack port access | |
2690 | * @sock: socket | |
2691 | * @address: address | |
2692 | * | |
2693 | * Create or update the port list entry | |
2694 | */ | |
6ea06247 | 2695 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2696 | int act) |
2697 | { | |
c6739443 CS |
2698 | struct smk_port_label *spp; |
2699 | struct socket_smack *ssp = sk->sk_security; | |
21abb1ec CS |
2700 | struct smack_known *skp = NULL; |
2701 | unsigned short port; | |
21c7eae2 | 2702 | struct smack_known *object; |
c6739443 CS |
2703 | |
2704 | if (act == SMK_RECEIVING) { | |
21abb1ec | 2705 | skp = smack_ipv6host_label(address); |
21c7eae2 | 2706 | object = ssp->smk_in; |
c6739443 | 2707 | } else { |
2f823ff8 | 2708 | skp = ssp->smk_out; |
21abb1ec | 2709 | object = smack_ipv6host_label(address); |
c6739443 CS |
2710 | } |
2711 | ||
2712 | /* | |
21abb1ec | 2713 | * The other end is a single label host. |
c6739443 | 2714 | */ |
21abb1ec CS |
2715 | if (skp != NULL && object != NULL) |
2716 | return smk_ipv6_check(skp, object, address, act); | |
2717 | if (skp == NULL) | |
2718 | skp = smack_net_ambient; | |
2719 | if (object == NULL) | |
2720 | object = smack_net_ambient; | |
c6739443 CS |
2721 | |
2722 | /* | |
2723 | * It's remote, so port lookup does no good. | |
2724 | */ | |
21abb1ec CS |
2725 | if (!smk_ipv6_localhost(address)) |
2726 | return smk_ipv6_check(skp, object, address, act); | |
c6739443 CS |
2727 | |
2728 | /* | |
2729 | * It's local so the send check has to have passed. | |
2730 | */ | |
21abb1ec CS |
2731 | if (act == SMK_RECEIVING) |
2732 | return 0; | |
c6739443 | 2733 | |
21abb1ec | 2734 | port = ntohs(address->sin6_port); |
3c7ce342 VG |
2735 | rcu_read_lock(); |
2736 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2737 | if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type) |
c6739443 | 2738 | continue; |
21c7eae2 | 2739 | object = spp->smk_in; |
c6739443 | 2740 | if (act == SMK_CONNECTING) |
54e70ec5 | 2741 | ssp->smk_packet = spp->smk_out; |
c6739443 CS |
2742 | break; |
2743 | } | |
3c7ce342 | 2744 | rcu_read_unlock(); |
c6739443 | 2745 | |
21abb1ec | 2746 | return smk_ipv6_check(skp, object, address, act); |
c6739443 | 2747 | } |
21abb1ec | 2748 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2749 | |
e114e473 CS |
2750 | /** |
2751 | * smack_inode_setsecurity - set smack xattrs | |
2752 | * @inode: the object | |
2753 | * @name: attribute name | |
2754 | * @value: attribute value | |
2755 | * @size: size of the attribute | |
2756 | * @flags: unused | |
2757 | * | |
2758 | * Sets the named attribute in the appropriate blob | |
2759 | * | |
2760 | * Returns 0 on success, or an error code | |
2761 | */ | |
2762 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2763 | const void *value, size_t size, int flags) | |
2764 | { | |
2f823ff8 | 2765 | struct smack_known *skp; |
e114e473 CS |
2766 | struct inode_smack *nsp = inode->i_security; |
2767 | struct socket_smack *ssp; | |
2768 | struct socket *sock; | |
4bc87e62 | 2769 | int rc = 0; |
e114e473 | 2770 | |
f7112e6c | 2771 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2772 | return -EINVAL; |
e114e473 | 2773 | |
2f823ff8 | 2774 | skp = smk_import_entry(value, size); |
e774ad68 LP |
2775 | if (IS_ERR(skp)) |
2776 | return PTR_ERR(skp); | |
e114e473 CS |
2777 | |
2778 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
21c7eae2 | 2779 | nsp->smk_inode = skp; |
ddd29ec6 | 2780 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2781 | return 0; |
2782 | } | |
2783 | /* | |
2784 | * The rest of the Smack xattrs are only on sockets. | |
2785 | */ | |
2786 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2787 | return -EOPNOTSUPP; | |
2788 | ||
2789 | sock = SOCKET_I(inode); | |
2e1d146a | 2790 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2791 | return -EOPNOTSUPP; |
2792 | ||
2793 | ssp = sock->sk->sk_security; | |
2794 | ||
2795 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 2796 | ssp->smk_in = skp; |
e114e473 | 2797 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2798 | ssp->smk_out = skp; |
c6739443 | 2799 | if (sock->sk->sk_family == PF_INET) { |
b4e0d5f0 CS |
2800 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2801 | if (rc != 0) | |
2802 | printk(KERN_WARNING | |
2803 | "Smack: \"%s\" netlbl error %d.\n", | |
2804 | __func__, -rc); | |
2805 | } | |
e114e473 CS |
2806 | } else |
2807 | return -EOPNOTSUPP; | |
2808 | ||
21abb1ec | 2809 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2810 | if (sock->sk->sk_family == PF_INET6) |
2811 | smk_ipv6_port_label(sock, NULL); | |
21abb1ec | 2812 | #endif |
c6739443 | 2813 | |
e114e473 CS |
2814 | return 0; |
2815 | } | |
2816 | ||
2817 | /** | |
2818 | * smack_socket_post_create - finish socket setup | |
2819 | * @sock: the socket | |
2820 | * @family: protocol family | |
2821 | * @type: unused | |
2822 | * @protocol: unused | |
2823 | * @kern: unused | |
2824 | * | |
2825 | * Sets the netlabel information on the socket | |
2826 | * | |
2827 | * Returns 0 on success, and error code otherwise | |
2828 | */ | |
2829 | static int smack_socket_post_create(struct socket *sock, int family, | |
2830 | int type, int protocol, int kern) | |
2831 | { | |
7412301b ML |
2832 | struct socket_smack *ssp; |
2833 | ||
2834 | if (sock->sk == NULL) | |
2835 | return 0; | |
2836 | ||
2837 | /* | |
2838 | * Sockets created by kernel threads receive web label. | |
2839 | */ | |
2840 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2841 | ssp = sock->sk->sk_security; | |
2842 | ssp->smk_in = &smack_known_web; | |
2843 | ssp->smk_out = &smack_known_web; | |
2844 | } | |
2845 | ||
2846 | if (family != PF_INET) | |
e114e473 CS |
2847 | return 0; |
2848 | /* | |
2849 | * Set the outbound netlbl. | |
2850 | */ | |
6d3dc07c CS |
2851 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2852 | } | |
2853 | ||
5859cdf5 TG |
2854 | /** |
2855 | * smack_socket_socketpair - create socket pair | |
2856 | * @socka: one socket | |
2857 | * @sockb: another socket | |
2858 | * | |
2859 | * Cross reference the peer labels for SO_PEERSEC | |
2860 | * | |
2861 | * Returns 0 on success, and error code otherwise | |
2862 | */ | |
2863 | static int smack_socket_socketpair(struct socket *socka, | |
2864 | struct socket *sockb) | |
2865 | { | |
2866 | struct socket_smack *asp = socka->sk->sk_security; | |
2867 | struct socket_smack *bsp = sockb->sk->sk_security; | |
2868 | ||
2869 | asp->smk_packet = bsp->smk_out; | |
2870 | bsp->smk_packet = asp->smk_out; | |
2871 | ||
2872 | return 0; | |
2873 | } | |
2874 | ||
21abb1ec | 2875 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2876 | /** |
2877 | * smack_socket_bind - record port binding information. | |
2878 | * @sock: the socket | |
2879 | * @address: the port address | |
2880 | * @addrlen: size of the address | |
2881 | * | |
2882 | * Records the label bound to a port. | |
2883 | * | |
2884 | * Returns 0 | |
2885 | */ | |
2886 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2887 | int addrlen) | |
2888 | { | |
2889 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) | |
2890 | smk_ipv6_port_label(sock, address); | |
c6739443 CS |
2891 | return 0; |
2892 | } | |
21abb1ec | 2893 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2894 | |
6d3dc07c CS |
2895 | /** |
2896 | * smack_socket_connect - connect access check | |
2897 | * @sock: the socket | |
2898 | * @sap: the other end | |
2899 | * @addrlen: size of sap | |
2900 | * | |
2901 | * Verifies that a connection may be possible | |
2902 | * | |
2903 | * Returns 0 on success, and error code otherwise | |
2904 | */ | |
2905 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2906 | int addrlen) | |
2907 | { | |
c6739443 | 2908 | int rc = 0; |
21abb1ec CS |
2909 | #if IS_ENABLED(CONFIG_IPV6) |
2910 | struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap; | |
2911 | #endif | |
2912 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
2913 | struct smack_known *rsp; | |
da49b5da | 2914 | struct socket_smack *ssp; |
21abb1ec | 2915 | #endif |
c6739443 CS |
2916 | |
2917 | if (sock->sk == NULL) | |
6d3dc07c | 2918 | return 0; |
6d3dc07c | 2919 | |
da49b5da VG |
2920 | #ifdef SMACK_IPV6_SECMARK_LABELING |
2921 | ssp = sock->sk->sk_security; | |
2922 | #endif | |
2923 | ||
c6739443 CS |
2924 | switch (sock->sk->sk_family) { |
2925 | case PF_INET: | |
2926 | if (addrlen < sizeof(struct sockaddr_in)) | |
2927 | return -EINVAL; | |
2928 | rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); | |
2929 | break; | |
2930 | case PF_INET6: | |
2931 | if (addrlen < sizeof(struct sockaddr_in6)) | |
2932 | return -EINVAL; | |
21abb1ec CS |
2933 | #ifdef SMACK_IPV6_SECMARK_LABELING |
2934 | rsp = smack_ipv6host_label(sip); | |
2935 | if (rsp != NULL) | |
2936 | rc = smk_ipv6_check(ssp->smk_out, rsp, sip, | |
6ea06247 | 2937 | SMK_CONNECTING); |
21abb1ec CS |
2938 | #endif |
2939 | #ifdef SMACK_IPV6_PORT_LABELING | |
2940 | rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING); | |
2941 | #endif | |
c6739443 CS |
2942 | break; |
2943 | } | |
2944 | return rc; | |
e114e473 CS |
2945 | } |
2946 | ||
2947 | /** | |
2948 | * smack_flags_to_may - convert S_ to MAY_ values | |
2949 | * @flags: the S_ value | |
2950 | * | |
2951 | * Returns the equivalent MAY_ value | |
2952 | */ | |
2953 | static int smack_flags_to_may(int flags) | |
2954 | { | |
2955 | int may = 0; | |
2956 | ||
2957 | if (flags & S_IRUGO) | |
2958 | may |= MAY_READ; | |
2959 | if (flags & S_IWUGO) | |
2960 | may |= MAY_WRITE; | |
2961 | if (flags & S_IXUGO) | |
2962 | may |= MAY_EXEC; | |
2963 | ||
2964 | return may; | |
2965 | } | |
2966 | ||
2967 | /** | |
2968 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2969 | * @msg: the object | |
2970 | * | |
2971 | * Returns 0 | |
2972 | */ | |
2973 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2974 | { | |
2f823ff8 CS |
2975 | struct smack_known *skp = smk_of_current(); |
2976 | ||
21c7eae2 | 2977 | msg->security = skp; |
e114e473 CS |
2978 | return 0; |
2979 | } | |
2980 | ||
2981 | /** | |
2982 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2983 | * @msg: the object | |
2984 | * | |
2985 | * Clears the blob pointer | |
2986 | */ | |
2987 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2988 | { | |
2989 | msg->security = NULL; | |
2990 | } | |
2991 | ||
2992 | /** | |
0d79cbf8 EB |
2993 | * smack_of_ipc - the smack pointer for the ipc |
2994 | * @isp: the object | |
e114e473 CS |
2995 | * |
2996 | * Returns a pointer to the smack value | |
2997 | */ | |
0d79cbf8 | 2998 | static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp) |
e114e473 | 2999 | { |
0d79cbf8 | 3000 | return (struct smack_known *)isp->security; |
e114e473 CS |
3001 | } |
3002 | ||
3003 | /** | |
0d79cbf8 EB |
3004 | * smack_ipc_alloc_security - Set the security blob for ipc |
3005 | * @isp: the object | |
e114e473 CS |
3006 | * |
3007 | * Returns 0 | |
3008 | */ | |
0d79cbf8 | 3009 | static int smack_ipc_alloc_security(struct kern_ipc_perm *isp) |
e114e473 | 3010 | { |
2f823ff8 | 3011 | struct smack_known *skp = smk_of_current(); |
e114e473 | 3012 | |
21c7eae2 | 3013 | isp->security = skp; |
e114e473 CS |
3014 | return 0; |
3015 | } | |
3016 | ||
3017 | /** | |
0d79cbf8 EB |
3018 | * smack_ipc_free_security - Clear the security blob for ipc |
3019 | * @isp: the object | |
e114e473 CS |
3020 | * |
3021 | * Clears the blob pointer | |
3022 | */ | |
0d79cbf8 | 3023 | static void smack_ipc_free_security(struct kern_ipc_perm *isp) |
e114e473 | 3024 | { |
e114e473 CS |
3025 | isp->security = NULL; |
3026 | } | |
3027 | ||
ecfcc53f EB |
3028 | /** |
3029 | * smk_curacc_shm : check if current has access on shm | |
0d79cbf8 | 3030 | * @isp : the object |
ecfcc53f EB |
3031 | * @access : access requested |
3032 | * | |
3033 | * Returns 0 if current has the requested access, error code otherwise | |
3034 | */ | |
0d79cbf8 | 3035 | static int smk_curacc_shm(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3036 | { |
0d79cbf8 | 3037 | struct smack_known *ssp = smack_of_ipc(isp); |
ecfcc53f | 3038 | struct smk_audit_info ad; |
d166c802 | 3039 | int rc; |
ecfcc53f EB |
3040 | |
3041 | #ifdef CONFIG_AUDIT | |
3042 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3043 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3044 | #endif |
d166c802 CS |
3045 | rc = smk_curacc(ssp, access, &ad); |
3046 | rc = smk_bu_current("shm", ssp, access, rc); | |
3047 | return rc; | |
ecfcc53f EB |
3048 | } |
3049 | ||
e114e473 CS |
3050 | /** |
3051 | * smack_shm_associate - Smack access check for shm | |
0d79cbf8 | 3052 | * @isp: the object |
e114e473 CS |
3053 | * @shmflg: access requested |
3054 | * | |
3055 | * Returns 0 if current has the requested access, error code otherwise | |
3056 | */ | |
0d79cbf8 | 3057 | static int smack_shm_associate(struct kern_ipc_perm *isp, int shmflg) |
e114e473 | 3058 | { |
e114e473 CS |
3059 | int may; |
3060 | ||
3061 | may = smack_flags_to_may(shmflg); | |
0d79cbf8 | 3062 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3063 | } |
3064 | ||
3065 | /** | |
3066 | * smack_shm_shmctl - Smack access check for shm | |
0d79cbf8 | 3067 | * @isp: the object |
e114e473 CS |
3068 | * @cmd: what it wants to do |
3069 | * | |
3070 | * Returns 0 if current has the requested access, error code otherwise | |
3071 | */ | |
0d79cbf8 | 3072 | static int smack_shm_shmctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3073 | { |
e114e473 CS |
3074 | int may; |
3075 | ||
3076 | switch (cmd) { | |
3077 | case IPC_STAT: | |
3078 | case SHM_STAT: | |
c21a6970 | 3079 | case SHM_STAT_ANY: |
e114e473 CS |
3080 | may = MAY_READ; |
3081 | break; | |
3082 | case IPC_SET: | |
3083 | case SHM_LOCK: | |
3084 | case SHM_UNLOCK: | |
3085 | case IPC_RMID: | |
3086 | may = MAY_READWRITE; | |
3087 | break; | |
3088 | case IPC_INFO: | |
3089 | case SHM_INFO: | |
3090 | /* | |
3091 | * System level information. | |
3092 | */ | |
3093 | return 0; | |
3094 | default: | |
3095 | return -EINVAL; | |
3096 | } | |
0d79cbf8 | 3097 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3098 | } |
3099 | ||
3100 | /** | |
3101 | * smack_shm_shmat - Smack access for shmat | |
0d79cbf8 | 3102 | * @isp: the object |
e114e473 CS |
3103 | * @shmaddr: unused |
3104 | * @shmflg: access requested | |
3105 | * | |
3106 | * Returns 0 if current has the requested access, error code otherwise | |
3107 | */ | |
0d79cbf8 | 3108 | static int smack_shm_shmat(struct kern_ipc_perm *ipc, char __user *shmaddr, |
e114e473 CS |
3109 | int shmflg) |
3110 | { | |
e114e473 CS |
3111 | int may; |
3112 | ||
3113 | may = smack_flags_to_may(shmflg); | |
0d79cbf8 | 3114 | return smk_curacc_shm(ipc, may); |
e114e473 CS |
3115 | } |
3116 | ||
ecfcc53f EB |
3117 | /** |
3118 | * smk_curacc_sem : check if current has access on sem | |
0d79cbf8 | 3119 | * @isp : the object |
ecfcc53f EB |
3120 | * @access : access requested |
3121 | * | |
3122 | * Returns 0 if current has the requested access, error code otherwise | |
3123 | */ | |
0d79cbf8 | 3124 | static int smk_curacc_sem(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3125 | { |
0d79cbf8 | 3126 | struct smack_known *ssp = smack_of_ipc(isp); |
ecfcc53f | 3127 | struct smk_audit_info ad; |
d166c802 | 3128 | int rc; |
ecfcc53f EB |
3129 | |
3130 | #ifdef CONFIG_AUDIT | |
3131 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3132 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3133 | #endif |
d166c802 CS |
3134 | rc = smk_curacc(ssp, access, &ad); |
3135 | rc = smk_bu_current("sem", ssp, access, rc); | |
3136 | return rc; | |
ecfcc53f EB |
3137 | } |
3138 | ||
e114e473 CS |
3139 | /** |
3140 | * smack_sem_associate - Smack access check for sem | |
0d79cbf8 | 3141 | * @isp: the object |
e114e473 CS |
3142 | * @semflg: access requested |
3143 | * | |
3144 | * Returns 0 if current has the requested access, error code otherwise | |
3145 | */ | |
0d79cbf8 | 3146 | static int smack_sem_associate(struct kern_ipc_perm *isp, int semflg) |
e114e473 | 3147 | { |
e114e473 CS |
3148 | int may; |
3149 | ||
3150 | may = smack_flags_to_may(semflg); | |
0d79cbf8 | 3151 | return smk_curacc_sem(isp, may); |
e114e473 CS |
3152 | } |
3153 | ||
3154 | /** | |
3155 | * smack_sem_shmctl - Smack access check for sem | |
0d79cbf8 | 3156 | * @isp: the object |
e114e473 CS |
3157 | * @cmd: what it wants to do |
3158 | * | |
3159 | * Returns 0 if current has the requested access, error code otherwise | |
3160 | */ | |
0d79cbf8 | 3161 | static int smack_sem_semctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3162 | { |
e114e473 CS |
3163 | int may; |
3164 | ||
3165 | switch (cmd) { | |
3166 | case GETPID: | |
3167 | case GETNCNT: | |
3168 | case GETZCNT: | |
3169 | case GETVAL: | |
3170 | case GETALL: | |
3171 | case IPC_STAT: | |
3172 | case SEM_STAT: | |
a280d6dc | 3173 | case SEM_STAT_ANY: |
e114e473 CS |
3174 | may = MAY_READ; |
3175 | break; | |
3176 | case SETVAL: | |
3177 | case SETALL: | |
3178 | case IPC_RMID: | |
3179 | case IPC_SET: | |
3180 | may = MAY_READWRITE; | |
3181 | break; | |
3182 | case IPC_INFO: | |
3183 | case SEM_INFO: | |
3184 | /* | |
3185 | * System level information | |
3186 | */ | |
3187 | return 0; | |
3188 | default: | |
3189 | return -EINVAL; | |
3190 | } | |
3191 | ||
0d79cbf8 | 3192 | return smk_curacc_sem(isp, may); |
e114e473 CS |
3193 | } |
3194 | ||
3195 | /** | |
3196 | * smack_sem_semop - Smack checks of semaphore operations | |
0d79cbf8 | 3197 | * @isp: the object |
e114e473 CS |
3198 | * @sops: unused |
3199 | * @nsops: unused | |
3200 | * @alter: unused | |
3201 | * | |
3202 | * Treated as read and write in all cases. | |
3203 | * | |
3204 | * Returns 0 if access is allowed, error code otherwise | |
3205 | */ | |
0d79cbf8 | 3206 | static int smack_sem_semop(struct kern_ipc_perm *isp, struct sembuf *sops, |
e114e473 CS |
3207 | unsigned nsops, int alter) |
3208 | { | |
0d79cbf8 | 3209 | return smk_curacc_sem(isp, MAY_READWRITE); |
e114e473 CS |
3210 | } |
3211 | ||
ecfcc53f EB |
3212 | /** |
3213 | * smk_curacc_msq : helper to check if current has access on msq | |
0d79cbf8 | 3214 | * @isp : the msq |
ecfcc53f EB |
3215 | * @access : access requested |
3216 | * | |
3217 | * return 0 if current has access, error otherwise | |
3218 | */ | |
0d79cbf8 | 3219 | static int smk_curacc_msq(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3220 | { |
0d79cbf8 | 3221 | struct smack_known *msp = smack_of_ipc(isp); |
ecfcc53f | 3222 | struct smk_audit_info ad; |
d166c802 | 3223 | int rc; |
ecfcc53f EB |
3224 | |
3225 | #ifdef CONFIG_AUDIT | |
3226 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3227 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3228 | #endif |
d166c802 CS |
3229 | rc = smk_curacc(msp, access, &ad); |
3230 | rc = smk_bu_current("msq", msp, access, rc); | |
3231 | return rc; | |
ecfcc53f EB |
3232 | } |
3233 | ||
e114e473 CS |
3234 | /** |
3235 | * smack_msg_queue_associate - Smack access check for msg_queue | |
0d79cbf8 | 3236 | * @isp: the object |
e114e473 CS |
3237 | * @msqflg: access requested |
3238 | * | |
3239 | * Returns 0 if current has the requested access, error code otherwise | |
3240 | */ | |
0d79cbf8 | 3241 | static int smack_msg_queue_associate(struct kern_ipc_perm *isp, int msqflg) |
e114e473 | 3242 | { |
e114e473 CS |
3243 | int may; |
3244 | ||
3245 | may = smack_flags_to_may(msqflg); | |
0d79cbf8 | 3246 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3247 | } |
3248 | ||
3249 | /** | |
3250 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
0d79cbf8 | 3251 | * @isp: the object |
e114e473 CS |
3252 | * @cmd: what it wants to do |
3253 | * | |
3254 | * Returns 0 if current has the requested access, error code otherwise | |
3255 | */ | |
0d79cbf8 | 3256 | static int smack_msg_queue_msgctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3257 | { |
e114e473 CS |
3258 | int may; |
3259 | ||
3260 | switch (cmd) { | |
3261 | case IPC_STAT: | |
3262 | case MSG_STAT: | |
23c8cec8 | 3263 | case MSG_STAT_ANY: |
e114e473 CS |
3264 | may = MAY_READ; |
3265 | break; | |
3266 | case IPC_SET: | |
3267 | case IPC_RMID: | |
3268 | may = MAY_READWRITE; | |
3269 | break; | |
3270 | case IPC_INFO: | |
3271 | case MSG_INFO: | |
3272 | /* | |
3273 | * System level information | |
3274 | */ | |
3275 | return 0; | |
3276 | default: | |
3277 | return -EINVAL; | |
3278 | } | |
3279 | ||
0d79cbf8 | 3280 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3281 | } |
3282 | ||
3283 | /** | |
3284 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
0d79cbf8 | 3285 | * @isp: the object |
e114e473 CS |
3286 | * @msg: unused |
3287 | * @msqflg: access requested | |
3288 | * | |
3289 | * Returns 0 if current has the requested access, error code otherwise | |
3290 | */ | |
0d79cbf8 | 3291 | static int smack_msg_queue_msgsnd(struct kern_ipc_perm *isp, struct msg_msg *msg, |
e114e473 CS |
3292 | int msqflg) |
3293 | { | |
ecfcc53f | 3294 | int may; |
e114e473 | 3295 | |
ecfcc53f | 3296 | may = smack_flags_to_may(msqflg); |
0d79cbf8 | 3297 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3298 | } |
3299 | ||
3300 | /** | |
3301 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
0d79cbf8 | 3302 | * @isp: the object |
e114e473 CS |
3303 | * @msg: unused |
3304 | * @target: unused | |
3305 | * @type: unused | |
3306 | * @mode: unused | |
3307 | * | |
3308 | * Returns 0 if current has read and write access, error code otherwise | |
3309 | */ | |
0d79cbf8 | 3310 | static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, struct msg_msg *msg, |
e114e473 CS |
3311 | struct task_struct *target, long type, int mode) |
3312 | { | |
0d79cbf8 | 3313 | return smk_curacc_msq(isp, MAY_READWRITE); |
e114e473 CS |
3314 | } |
3315 | ||
3316 | /** | |
3317 | * smack_ipc_permission - Smack access for ipc_permission() | |
3318 | * @ipp: the object permissions | |
3319 | * @flag: access requested | |
3320 | * | |
3321 | * Returns 0 if current has read and write access, error code otherwise | |
3322 | */ | |
3323 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
3324 | { | |
21c7eae2 | 3325 | struct smack_known *iskp = ipp->security; |
ecfcc53f EB |
3326 | int may = smack_flags_to_may(flag); |
3327 | struct smk_audit_info ad; | |
d166c802 | 3328 | int rc; |
e114e473 | 3329 | |
ecfcc53f EB |
3330 | #ifdef CONFIG_AUDIT |
3331 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3332 | ad.a.u.ipc_id = ipp->id; | |
3333 | #endif | |
21c7eae2 LP |
3334 | rc = smk_curacc(iskp, may, &ad); |
3335 | rc = smk_bu_current("svipc", iskp, may, rc); | |
d166c802 | 3336 | return rc; |
e114e473 CS |
3337 | } |
3338 | ||
d20bdda6 AD |
3339 | /** |
3340 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 3341 | * @ipp: the object permissions |
d20bdda6 AD |
3342 | * @secid: where result will be saved |
3343 | */ | |
3344 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
3345 | { | |
21c7eae2 | 3346 | struct smack_known *iskp = ipp->security; |
d20bdda6 | 3347 | |
21c7eae2 | 3348 | *secid = iskp->smk_secid; |
d20bdda6 AD |
3349 | } |
3350 | ||
e114e473 CS |
3351 | /** |
3352 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 3353 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
3354 | * @inode: the object |
3355 | * | |
3356 | * Set the inode's security blob if it hasn't been done already. | |
3357 | */ | |
3358 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
3359 | { | |
3360 | struct super_block *sbp; | |
3361 | struct superblock_smack *sbsp; | |
3362 | struct inode_smack *isp; | |
2f823ff8 CS |
3363 | struct smack_known *skp; |
3364 | struct smack_known *ckp = smk_of_current(); | |
21c7eae2 | 3365 | struct smack_known *final; |
5c6d1125 JS |
3366 | char trattr[TRANS_TRUE_SIZE]; |
3367 | int transflag = 0; | |
2267b13a | 3368 | int rc; |
e114e473 CS |
3369 | struct dentry *dp; |
3370 | ||
3371 | if (inode == NULL) | |
3372 | return; | |
3373 | ||
3374 | isp = inode->i_security; | |
3375 | ||
3376 | mutex_lock(&isp->smk_lock); | |
3377 | /* | |
3378 | * If the inode is already instantiated | |
3379 | * take the quick way out | |
3380 | */ | |
3381 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
3382 | goto unlockandout; | |
3383 | ||
3384 | sbp = inode->i_sb; | |
3385 | sbsp = sbp->s_security; | |
3386 | /* | |
3387 | * We're going to use the superblock default label | |
3388 | * if there's no label on the file. | |
3389 | */ | |
3390 | final = sbsp->smk_default; | |
3391 | ||
e97dcb0e CS |
3392 | /* |
3393 | * If this is the root inode the superblock | |
3394 | * may be in the process of initialization. | |
3395 | * If that is the case use the root value out | |
3396 | * of the superblock. | |
3397 | */ | |
3398 | if (opt_dentry->d_parent == opt_dentry) { | |
1d8c2326 ŁS |
3399 | switch (sbp->s_magic) { |
3400 | case CGROUP_SUPER_MAGIC: | |
58c442f3 | 3401 | case CGROUP2_SUPER_MAGIC: |
36ea735b CS |
3402 | /* |
3403 | * The cgroup filesystem is never mounted, | |
3404 | * so there's no opportunity to set the mount | |
3405 | * options. | |
3406 | */ | |
21c7eae2 LP |
3407 | sbsp->smk_root = &smack_known_star; |
3408 | sbsp->smk_default = &smack_known_star; | |
1d8c2326 ŁS |
3409 | isp->smk_inode = sbsp->smk_root; |
3410 | break; | |
3411 | case TMPFS_MAGIC: | |
3412 | /* | |
3413 | * What about shmem/tmpfs anonymous files with dentry | |
3414 | * obtained from d_alloc_pseudo()? | |
3415 | */ | |
3416 | isp->smk_inode = smk_of_current(); | |
3417 | break; | |
8da4aba5 RK |
3418 | case PIPEFS_MAGIC: |
3419 | isp->smk_inode = smk_of_current(); | |
3420 | break; | |
805b65a8 RK |
3421 | case SOCKFS_MAGIC: |
3422 | /* | |
3423 | * Socket access is controlled by the socket | |
3424 | * structures associated with the task involved. | |
3425 | */ | |
3426 | isp->smk_inode = &smack_known_star; | |
3427 | break; | |
1d8c2326 ŁS |
3428 | default: |
3429 | isp->smk_inode = sbsp->smk_root; | |
3430 | break; | |
36ea735b | 3431 | } |
e97dcb0e CS |
3432 | isp->smk_flags |= SMK_INODE_INSTANT; |
3433 | goto unlockandout; | |
3434 | } | |
3435 | ||
e114e473 CS |
3436 | /* |
3437 | * This is pretty hackish. | |
3438 | * Casey says that we shouldn't have to do | |
3439 | * file system specific code, but it does help | |
3440 | * with keeping it simple. | |
3441 | */ | |
3442 | switch (sbp->s_magic) { | |
3443 | case SMACK_MAGIC: | |
36ea735b | 3444 | case CGROUP_SUPER_MAGIC: |
58c442f3 | 3445 | case CGROUP2_SUPER_MAGIC: |
e114e473 | 3446 | /* |
25985edc | 3447 | * Casey says that it's a little embarrassing |
e114e473 CS |
3448 | * that the smack file system doesn't do |
3449 | * extended attributes. | |
36ea735b | 3450 | * |
36ea735b | 3451 | * Cgroupfs is special |
e114e473 | 3452 | */ |
21c7eae2 | 3453 | final = &smack_known_star; |
e114e473 CS |
3454 | break; |
3455 | case DEVPTS_SUPER_MAGIC: | |
3456 | /* | |
3457 | * devpts seems content with the label of the task. | |
3458 | * Programs that change smack have to treat the | |
3459 | * pty with respect. | |
3460 | */ | |
21c7eae2 | 3461 | final = ckp; |
e114e473 | 3462 | break; |
e114e473 CS |
3463 | case PROC_SUPER_MAGIC: |
3464 | /* | |
3465 | * Casey says procfs appears not to care. | |
3466 | * The superblock default suffices. | |
3467 | */ | |
3468 | break; | |
3469 | case TMPFS_MAGIC: | |
3470 | /* | |
3471 | * Device labels should come from the filesystem, | |
3472 | * but watch out, because they're volitile, | |
3473 | * getting recreated on every reboot. | |
3474 | */ | |
21c7eae2 | 3475 | final = &smack_known_star; |
e114e473 | 3476 | /* |
b1fed3ed | 3477 | * Fall through. |
e114e473 CS |
3478 | * |
3479 | * If a smack value has been set we want to use it, | |
3480 | * but since tmpfs isn't giving us the opportunity | |
3481 | * to set mount options simulate setting the | |
3482 | * superblock default. | |
3483 | */ | |
3484 | default: | |
3485 | /* | |
3486 | * This isn't an understood special case. | |
3487 | * Get the value from the xattr. | |
b4e0d5f0 CS |
3488 | */ |
3489 | ||
3490 | /* | |
3491 | * UNIX domain sockets use lower level socket data. | |
3492 | */ | |
3493 | if (S_ISSOCK(inode->i_mode)) { | |
21c7eae2 | 3494 | final = &smack_known_star; |
b4e0d5f0 CS |
3495 | break; |
3496 | } | |
3497 | /* | |
e114e473 CS |
3498 | * No xattr support means, alas, no SMACK label. |
3499 | * Use the aforeapplied default. | |
3500 | * It would be curious if the label of the task | |
3501 | * does not match that assigned. | |
3502 | */ | |
5d6c3191 AG |
3503 | if (!(inode->i_opflags & IOP_XATTR)) |
3504 | break; | |
e114e473 CS |
3505 | /* |
3506 | * Get the dentry for xattr. | |
3507 | */ | |
3e62cbb8 | 3508 | dp = dget(opt_dentry); |
2f823ff8 | 3509 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
e774ad68 | 3510 | if (!IS_ERR_OR_NULL(skp)) |
21c7eae2 | 3511 | final = skp; |
2267b13a CS |
3512 | |
3513 | /* | |
3514 | * Transmuting directory | |
3515 | */ | |
3516 | if (S_ISDIR(inode->i_mode)) { | |
3517 | /* | |
3518 | * If this is a new directory and the label was | |
3519 | * transmuted when the inode was initialized | |
3520 | * set the transmute attribute on the directory | |
3521 | * and mark the inode. | |
3522 | * | |
3523 | * If there is a transmute attribute on the | |
3524 | * directory mark the inode. | |
3525 | */ | |
3526 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
3527 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
5d6c3191 | 3528 | rc = __vfs_setxattr(dp, inode, |
5c6d1125 | 3529 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
3530 | TRANS_TRUE, TRANS_TRUE_SIZE, |
3531 | 0); | |
3532 | } else { | |
5d6c3191 | 3533 | rc = __vfs_getxattr(dp, inode, |
2267b13a CS |
3534 | XATTR_NAME_SMACKTRANSMUTE, trattr, |
3535 | TRANS_TRUE_SIZE); | |
3536 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
3537 | TRANS_TRUE_SIZE) != 0) | |
3538 | rc = -EINVAL; | |
5c6d1125 | 3539 | } |
2267b13a CS |
3540 | if (rc >= 0) |
3541 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 3542 | } |
809c02e0 SF |
3543 | /* |
3544 | * Don't let the exec or mmap label be "*" or "@". | |
3545 | */ | |
3546 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
3547 | if (IS_ERR(skp) || skp == &smack_known_star || | |
3548 | skp == &smack_known_web) | |
3549 | skp = NULL; | |
3550 | isp->smk_task = skp; | |
e774ad68 | 3551 | |
19760ad0 | 3552 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
e774ad68 LP |
3553 | if (IS_ERR(skp) || skp == &smack_known_star || |
3554 | skp == &smack_known_web) | |
19760ad0 CS |
3555 | skp = NULL; |
3556 | isp->smk_mmap = skp; | |
676dac4b | 3557 | |
e114e473 CS |
3558 | dput(dp); |
3559 | break; | |
3560 | } | |
3561 | ||
3562 | if (final == NULL) | |
21c7eae2 | 3563 | isp->smk_inode = ckp; |
e114e473 CS |
3564 | else |
3565 | isp->smk_inode = final; | |
3566 | ||
5c6d1125 | 3567 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
3568 | |
3569 | unlockandout: | |
3570 | mutex_unlock(&isp->smk_lock); | |
3571 | return; | |
3572 | } | |
3573 | ||
3574 | /** | |
3575 | * smack_getprocattr - Smack process attribute access | |
3576 | * @p: the object task | |
3577 | * @name: the name of the attribute in /proc/.../attr | |
3578 | * @value: where to put the result | |
3579 | * | |
3580 | * Places a copy of the task Smack into value | |
3581 | * | |
3582 | * Returns the length of the smack label or an error code | |
3583 | */ | |
3584 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
3585 | { | |
6d1cff2a | 3586 | struct smack_known *skp = smk_of_task_struct(p); |
e114e473 CS |
3587 | char *cp; |
3588 | int slen; | |
3589 | ||
3590 | if (strcmp(name, "current") != 0) | |
3591 | return -EINVAL; | |
3592 | ||
2f823ff8 | 3593 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
3594 | if (cp == NULL) |
3595 | return -ENOMEM; | |
3596 | ||
3597 | slen = strlen(cp); | |
3598 | *value = cp; | |
3599 | return slen; | |
3600 | } | |
3601 | ||
3602 | /** | |
3603 | * smack_setprocattr - Smack process attribute setting | |
e114e473 CS |
3604 | * @name: the name of the attribute in /proc/.../attr |
3605 | * @value: the value to set | |
3606 | * @size: the size of the value | |
3607 | * | |
3608 | * Sets the Smack value of the task. Only setting self | |
3609 | * is permitted and only with privilege | |
3610 | * | |
3611 | * Returns the length of the smack label or an error code | |
3612 | */ | |
b21507e2 | 3613 | static int smack_setprocattr(const char *name, void *value, size_t size) |
e114e473 | 3614 | { |
38416e53 | 3615 | struct task_smack *tsp = current_security(); |
d84f4f99 | 3616 | struct cred *new; |
2f823ff8 | 3617 | struct smack_known *skp; |
38416e53 ZJ |
3618 | struct smack_known_list_elem *sklep; |
3619 | int rc; | |
e114e473 | 3620 | |
38416e53 | 3621 | if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel)) |
5cd9c58f DH |
3622 | return -EPERM; |
3623 | ||
f7112e6c | 3624 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3625 | return -EINVAL; |
3626 | ||
3627 | if (strcmp(name, "current") != 0) | |
3628 | return -EINVAL; | |
3629 | ||
2f823ff8 | 3630 | skp = smk_import_entry(value, size); |
e774ad68 LP |
3631 | if (IS_ERR(skp)) |
3632 | return PTR_ERR(skp); | |
e114e473 | 3633 | |
6d3dc07c | 3634 | /* |
7128ea15 HS |
3635 | * No process is ever allowed the web ("@") label |
3636 | * and the star ("*") label. | |
6d3dc07c | 3637 | */ |
7128ea15 HS |
3638 | if (skp == &smack_known_web || skp == &smack_known_star) |
3639 | return -EINVAL; | |
6d3dc07c | 3640 | |
38416e53 ZJ |
3641 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
3642 | rc = -EPERM; | |
3643 | list_for_each_entry(sklep, &tsp->smk_relabel, list) | |
3644 | if (sklep->smk_label == skp) { | |
3645 | rc = 0; | |
3646 | break; | |
3647 | } | |
3648 | if (rc) | |
3649 | return rc; | |
3650 | } | |
3651 | ||
d84f4f99 | 3652 | new = prepare_creds(); |
6d3dc07c | 3653 | if (new == NULL) |
d84f4f99 | 3654 | return -ENOMEM; |
7898e1f8 | 3655 | |
46a2f3b9 | 3656 | tsp = new->security; |
2f823ff8 | 3657 | tsp->smk_task = skp; |
38416e53 ZJ |
3658 | /* |
3659 | * process can change its label only once | |
3660 | */ | |
3661 | smk_destroy_label_list(&tsp->smk_relabel); | |
7898e1f8 | 3662 | |
d84f4f99 | 3663 | commit_creds(new); |
e114e473 CS |
3664 | return size; |
3665 | } | |
3666 | ||
3667 | /** | |
3668 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3669 | * @sock: one sock |
3670 | * @other: the other sock | |
e114e473 CS |
3671 | * @newsk: unused |
3672 | * | |
3673 | * Return 0 if a subject with the smack of sock could access | |
3674 | * an object with the smack of other, otherwise an error code | |
3675 | */ | |
3610cda5 DM |
3676 | static int smack_unix_stream_connect(struct sock *sock, |
3677 | struct sock *other, struct sock *newsk) | |
e114e473 | 3678 | { |
2f823ff8 | 3679 | struct smack_known *skp; |
54e70ec5 | 3680 | struct smack_known *okp; |
d2e7ad19 JM |
3681 | struct socket_smack *ssp = sock->sk_security; |
3682 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 3683 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 3684 | struct smk_audit_info ad; |
b4e0d5f0 | 3685 | int rc = 0; |
923e9a13 KC |
3686 | #ifdef CONFIG_AUDIT |
3687 | struct lsm_network_audit net; | |
923e9a13 | 3688 | #endif |
b4e0d5f0 | 3689 | |
2f823ff8 CS |
3690 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3691 | skp = ssp->smk_out; | |
96be7b54 | 3692 | okp = osp->smk_in; |
54e70ec5 CS |
3693 | #ifdef CONFIG_AUDIT |
3694 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3695 | smk_ad_setfield_u_net_sk(&ad, other); | |
3696 | #endif | |
21c7eae2 LP |
3697 | rc = smk_access(skp, okp, MAY_WRITE, &ad); |
3698 | rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc); | |
d166c802 | 3699 | if (rc == 0) { |
96be7b54 ZJ |
3700 | okp = osp->smk_out; |
3701 | skp = ssp->smk_in; | |
138a868f | 3702 | rc = smk_access(okp, skp, MAY_WRITE, &ad); |
21c7eae2 | 3703 | rc = smk_bu_note("UDS connect", okp, skp, |
d166c802 CS |
3704 | MAY_WRITE, rc); |
3705 | } | |
2f823ff8 | 3706 | } |
b4e0d5f0 | 3707 | |
975d5e55 CS |
3708 | /* |
3709 | * Cross reference the peer labels for SO_PEERSEC. | |
3710 | */ | |
3711 | if (rc == 0) { | |
54e70ec5 CS |
3712 | nsp->smk_packet = ssp->smk_out; |
3713 | ssp->smk_packet = osp->smk_out; | |
975d5e55 CS |
3714 | } |
3715 | ||
b4e0d5f0 | 3716 | return rc; |
e114e473 CS |
3717 | } |
3718 | ||
3719 | /** | |
3720 | * smack_unix_may_send - Smack access on UDS | |
3721 | * @sock: one socket | |
3722 | * @other: the other socket | |
3723 | * | |
3724 | * Return 0 if a subject with the smack of sock could access | |
3725 | * an object with the smack of other, otherwise an error code | |
3726 | */ | |
3727 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3728 | { | |
b4e0d5f0 CS |
3729 | struct socket_smack *ssp = sock->sk->sk_security; |
3730 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 3731 | struct smk_audit_info ad; |
d166c802 | 3732 | int rc; |
e114e473 | 3733 | |
923e9a13 KC |
3734 | #ifdef CONFIG_AUDIT |
3735 | struct lsm_network_audit net; | |
3736 | ||
48c62af6 | 3737 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3738 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3739 | #endif |
b4e0d5f0 | 3740 | |
2f823ff8 CS |
3741 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3742 | return 0; | |
b4e0d5f0 | 3743 | |
21c7eae2 LP |
3744 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); |
3745 | rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc); | |
d166c802 | 3746 | return rc; |
e114e473 CS |
3747 | } |
3748 | ||
6d3dc07c CS |
3749 | /** |
3750 | * smack_socket_sendmsg - Smack check based on destination host | |
3751 | * @sock: the socket | |
251a2a95 | 3752 | * @msg: the message |
6d3dc07c CS |
3753 | * @size: the size of the message |
3754 | * | |
c6739443 CS |
3755 | * Return 0 if the current subject can write to the destination host. |
3756 | * For IPv4 this is only a question if the destination is a single label host. | |
3757 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3758 | */ |
3759 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3760 | int size) | |
3761 | { | |
3762 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
21abb1ec | 3763 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3764 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
21abb1ec CS |
3765 | #endif |
3766 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
3767 | struct socket_smack *ssp = sock->sk->sk_security; | |
3768 | struct smack_known *rsp; | |
3769 | #endif | |
c6739443 | 3770 | int rc = 0; |
6d3dc07c CS |
3771 | |
3772 | /* | |
3773 | * Perfectly reasonable for this to be NULL | |
3774 | */ | |
c6739443 | 3775 | if (sip == NULL) |
6d3dc07c CS |
3776 | return 0; |
3777 | ||
81bd0d56 | 3778 | switch (sock->sk->sk_family) { |
c6739443 CS |
3779 | case AF_INET: |
3780 | rc = smack_netlabel_send(sock->sk, sip); | |
3781 | break; | |
3782 | case AF_INET6: | |
21abb1ec CS |
3783 | #ifdef SMACK_IPV6_SECMARK_LABELING |
3784 | rsp = smack_ipv6host_label(sap); | |
3785 | if (rsp != NULL) | |
3786 | rc = smk_ipv6_check(ssp->smk_out, rsp, sap, | |
3787 | SMK_CONNECTING); | |
3788 | #endif | |
3789 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 | 3790 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); |
21abb1ec | 3791 | #endif |
c6739443 CS |
3792 | break; |
3793 | } | |
3794 | return rc; | |
6d3dc07c CS |
3795 | } |
3796 | ||
e114e473 | 3797 | /** |
251a2a95 | 3798 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3799 | * @sap: netlabel secattr |
272cd7a8 | 3800 | * @ssp: socket security information |
e114e473 | 3801 | * |
2f823ff8 | 3802 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3803 | */ |
2f823ff8 CS |
3804 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3805 | struct socket_smack *ssp) | |
e114e473 | 3806 | { |
2f823ff8 | 3807 | struct smack_known *skp; |
f7112e6c | 3808 | int found = 0; |
677264e8 CS |
3809 | int acat; |
3810 | int kcat; | |
e114e473 | 3811 | |
6d3dc07c | 3812 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3813 | /* |
6d3dc07c | 3814 | * Looks like a CIPSO packet. |
e114e473 CS |
3815 | * If there are flags but no level netlabel isn't |
3816 | * behaving the way we expect it to. | |
3817 | * | |
f7112e6c | 3818 | * Look it up in the label table |
e114e473 CS |
3819 | * Without guidance regarding the smack value |
3820 | * for the packet fall back on the network | |
3821 | * ambient value. | |
3822 | */ | |
f7112e6c | 3823 | rcu_read_lock(); |
348dc288 | 3824 | list_for_each_entry_rcu(skp, &smack_known_list, list) { |
2f823ff8 | 3825 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) |
f7112e6c | 3826 | continue; |
677264e8 CS |
3827 | /* |
3828 | * Compare the catsets. Use the netlbl APIs. | |
3829 | */ | |
3830 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3831 | if ((skp->smk_netlabel.flags & | |
3832 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3833 | found = 1; | |
3834 | break; | |
3835 | } | |
3836 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
4fbe63d1 PM |
3837 | acat = netlbl_catmap_walk(sap->attr.mls.cat, |
3838 | acat + 1); | |
3839 | kcat = netlbl_catmap_walk( | |
677264e8 CS |
3840 | skp->smk_netlabel.attr.mls.cat, |
3841 | kcat + 1); | |
3842 | if (acat < 0 || kcat < 0) | |
3843 | break; | |
3844 | } | |
3845 | if (acat == kcat) { | |
3846 | found = 1; | |
3847 | break; | |
3848 | } | |
6d3dc07c | 3849 | } |
f7112e6c CS |
3850 | rcu_read_unlock(); |
3851 | ||
3852 | if (found) | |
2f823ff8 | 3853 | return skp; |
f7112e6c | 3854 | |
54e70ec5 | 3855 | if (ssp != NULL && ssp->smk_in == &smack_known_star) |
2f823ff8 CS |
3856 | return &smack_known_web; |
3857 | return &smack_known_star; | |
e114e473 | 3858 | } |
152f91d4 | 3859 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) |
6d3dc07c CS |
3860 | /* |
3861 | * Looks like a fallback, which gives us a secid. | |
3862 | */ | |
152f91d4 | 3863 | return smack_from_secid(sap->attr.secid); |
e114e473 | 3864 | /* |
6d3dc07c CS |
3865 | * Without guidance regarding the smack value |
3866 | * for the packet fall back on the network | |
3867 | * ambient value. | |
e114e473 | 3868 | */ |
272cd7a8 | 3869 | return smack_net_ambient; |
e114e473 CS |
3870 | } |
3871 | ||
69f287ae | 3872 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3873 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3874 | { |
c6739443 CS |
3875 | u8 nexthdr; |
3876 | int offset; | |
3877 | int proto = -EINVAL; | |
3878 | struct ipv6hdr _ipv6h; | |
3879 | struct ipv6hdr *ip6; | |
3880 | __be16 frag_off; | |
3881 | struct tcphdr _tcph, *th; | |
3882 | struct udphdr _udph, *uh; | |
3883 | struct dccp_hdr _dccph, *dh; | |
3884 | ||
3885 | sip->sin6_port = 0; | |
3886 | ||
3887 | offset = skb_network_offset(skb); | |
3888 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3889 | if (ip6 == NULL) | |
3890 | return -EINVAL; | |
3891 | sip->sin6_addr = ip6->saddr; | |
3892 | ||
3893 | nexthdr = ip6->nexthdr; | |
3894 | offset += sizeof(_ipv6h); | |
3895 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3896 | if (offset < 0) | |
3897 | return -EINVAL; | |
3898 | ||
3899 | proto = nexthdr; | |
3900 | switch (proto) { | |
3901 | case IPPROTO_TCP: | |
3902 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3903 | if (th != NULL) | |
3904 | sip->sin6_port = th->source; | |
3905 | break; | |
3906 | case IPPROTO_UDP: | |
a07ef951 | 3907 | case IPPROTO_UDPLITE: |
c6739443 CS |
3908 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
3909 | if (uh != NULL) | |
3910 | sip->sin6_port = uh->source; | |
3911 | break; | |
3912 | case IPPROTO_DCCP: | |
3913 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3914 | if (dh != NULL) | |
3915 | sip->sin6_port = dh->dccph_sport; | |
3916 | break; | |
3917 | } | |
3918 | return proto; | |
3919 | } | |
69f287ae | 3920 | #endif /* CONFIG_IPV6 */ |
c6739443 | 3921 | |
e114e473 CS |
3922 | /** |
3923 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3924 | * @sk: socket | |
3925 | * @skb: packet | |
3926 | * | |
3927 | * Returns 0 if the packet should be delivered, an error code otherwise | |
3928 | */ | |
3929 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
3930 | { | |
3931 | struct netlbl_lsm_secattr secattr; | |
3932 | struct socket_smack *ssp = sk->sk_security; | |
69f287ae | 3933 | struct smack_known *skp = NULL; |
c6739443 | 3934 | int rc = 0; |
ecfcc53f | 3935 | struct smk_audit_info ad; |
129a9989 | 3936 | u16 family = sk->sk_family; |
923e9a13 | 3937 | #ifdef CONFIG_AUDIT |
48c62af6 | 3938 | struct lsm_network_audit net; |
923e9a13 | 3939 | #endif |
69f287ae CS |
3940 | #if IS_ENABLED(CONFIG_IPV6) |
3941 | struct sockaddr_in6 sadd; | |
3942 | int proto; | |
129a9989 PS |
3943 | |
3944 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
3945 | family = PF_INET; | |
69f287ae CS |
3946 | #endif /* CONFIG_IPV6 */ |
3947 | ||
129a9989 | 3948 | switch (family) { |
c6739443 | 3949 | case PF_INET: |
69f287ae CS |
3950 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3951 | /* | |
3952 | * If there is a secmark use it rather than the CIPSO label. | |
3953 | * If there is no secmark fall back to CIPSO. | |
3954 | * The secmark is assumed to reflect policy better. | |
3955 | */ | |
3956 | if (skb && skb->secmark != 0) { | |
3957 | skp = smack_from_secid(skb->secmark); | |
3958 | goto access_check; | |
3959 | } | |
3960 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
c6739443 CS |
3961 | /* |
3962 | * Translate what netlabel gave us. | |
3963 | */ | |
3964 | netlbl_secattr_init(&secattr); | |
6d3dc07c | 3965 | |
129a9989 | 3966 | rc = netlbl_skbuff_getattr(skb, family, &secattr); |
c6739443 | 3967 | if (rc == 0) |
2f823ff8 | 3968 | skp = smack_from_secattr(&secattr, ssp); |
c6739443 | 3969 | else |
2f823ff8 | 3970 | skp = smack_net_ambient; |
6d3dc07c | 3971 | |
c6739443 | 3972 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3973 | |
69f287ae CS |
3974 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3975 | access_check: | |
3976 | #endif | |
ecfcc53f | 3977 | #ifdef CONFIG_AUDIT |
c6739443 | 3978 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
129a9989 | 3979 | ad.a.u.net->family = family; |
c6739443 CS |
3980 | ad.a.u.net->netif = skb->skb_iif; |
3981 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 3982 | #endif |
c6739443 CS |
3983 | /* |
3984 | * Receiving a packet requires that the other end | |
3985 | * be able to write here. Read access is not required. | |
3986 | * This is the simplist possible security model | |
3987 | * for networking. | |
3988 | */ | |
21c7eae2 LP |
3989 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
3990 | rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in, | |
d166c802 | 3991 | MAY_WRITE, rc); |
c6739443 | 3992 | if (rc != 0) |
129a9989 | 3993 | netlbl_skbuff_err(skb, family, rc, 0); |
c6739443 | 3994 | break; |
69f287ae | 3995 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 | 3996 | case PF_INET6: |
69f287ae | 3997 | proto = smk_skb_to_addr_ipv6(skb, &sadd); |
a07ef951 PS |
3998 | if (proto != IPPROTO_UDP && proto != IPPROTO_UDPLITE && |
3999 | proto != IPPROTO_TCP && proto != IPPROTO_DCCP) | |
69f287ae | 4000 | break; |
21abb1ec | 4001 | #ifdef SMACK_IPV6_SECMARK_LABELING |
69f287ae CS |
4002 | if (skb && skb->secmark != 0) |
4003 | skp = smack_from_secid(skb->secmark); | |
c6739443 | 4004 | else |
21abb1ec CS |
4005 | skp = smack_ipv6host_label(&sadd); |
4006 | if (skp == NULL) | |
69f287ae CS |
4007 | skp = smack_net_ambient; |
4008 | #ifdef CONFIG_AUDIT | |
4009 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
129a9989 | 4010 | ad.a.u.net->family = family; |
69f287ae CS |
4011 | ad.a.u.net->netif = skb->skb_iif; |
4012 | ipv6_skb_to_auditdata(skb, &ad.a, NULL); | |
4013 | #endif /* CONFIG_AUDIT */ | |
4014 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); | |
4015 | rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in, | |
4016 | MAY_WRITE, rc); | |
21abb1ec CS |
4017 | #endif /* SMACK_IPV6_SECMARK_LABELING */ |
4018 | #ifdef SMACK_IPV6_PORT_LABELING | |
69f287ae | 4019 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); |
21abb1ec | 4020 | #endif /* SMACK_IPV6_PORT_LABELING */ |
d66a8acb PS |
4021 | if (rc != 0) |
4022 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
4023 | ICMPV6_ADM_PROHIBITED, 0); | |
c6739443 | 4024 | break; |
69f287ae | 4025 | #endif /* CONFIG_IPV6 */ |
c6739443 | 4026 | } |
69f287ae | 4027 | |
a8134296 | 4028 | return rc; |
e114e473 CS |
4029 | } |
4030 | ||
4031 | /** | |
4032 | * smack_socket_getpeersec_stream - pull in packet label | |
4033 | * @sock: the socket | |
4034 | * @optval: user's destination | |
4035 | * @optlen: size thereof | |
251a2a95 | 4036 | * @len: max thereof |
e114e473 CS |
4037 | * |
4038 | * returns zero on success, an error code otherwise | |
4039 | */ | |
4040 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
4041 | char __user *optval, | |
4042 | int __user *optlen, unsigned len) | |
4043 | { | |
4044 | struct socket_smack *ssp; | |
272cd7a8 CS |
4045 | char *rcp = ""; |
4046 | int slen = 1; | |
e114e473 CS |
4047 | int rc = 0; |
4048 | ||
4049 | ssp = sock->sk->sk_security; | |
272cd7a8 | 4050 | if (ssp->smk_packet != NULL) { |
54e70ec5 | 4051 | rcp = ssp->smk_packet->smk_known; |
272cd7a8 CS |
4052 | slen = strlen(rcp) + 1; |
4053 | } | |
e114e473 CS |
4054 | |
4055 | if (slen > len) | |
4056 | rc = -ERANGE; | |
272cd7a8 | 4057 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
4058 | rc = -EFAULT; |
4059 | ||
4060 | if (put_user(slen, optlen) != 0) | |
4061 | rc = -EFAULT; | |
4062 | ||
4063 | return rc; | |
4064 | } | |
4065 | ||
4066 | ||
4067 | /** | |
4068 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 4069 | * @sock: the peer socket |
e114e473 CS |
4070 | * @skb: packet data |
4071 | * @secid: pointer to where to put the secid of the packet | |
4072 | * | |
4073 | * Sets the netlabel socket state on sk from parent | |
4074 | */ | |
4075 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
4076 | struct sk_buff *skb, u32 *secid) | |
4077 | ||
4078 | { | |
4079 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 | 4080 | struct socket_smack *ssp = NULL; |
2f823ff8 | 4081 | struct smack_known *skp; |
b4e0d5f0 CS |
4082 | int family = PF_UNSPEC; |
4083 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
4084 | int rc; |
4085 | ||
b4e0d5f0 CS |
4086 | if (skb != NULL) { |
4087 | if (skb->protocol == htons(ETH_P_IP)) | |
4088 | family = PF_INET; | |
69f287ae | 4089 | #if IS_ENABLED(CONFIG_IPV6) |
b4e0d5f0 CS |
4090 | else if (skb->protocol == htons(ETH_P_IPV6)) |
4091 | family = PF_INET6; | |
69f287ae | 4092 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4093 | } |
b4e0d5f0 CS |
4094 | if (family == PF_UNSPEC && sock != NULL) |
4095 | family = sock->sk->sk_family; | |
e114e473 | 4096 | |
69f287ae CS |
4097 | switch (family) { |
4098 | case PF_UNIX: | |
272cd7a8 | 4099 | ssp = sock->sk->sk_security; |
2f823ff8 | 4100 | s = ssp->smk_out->smk_secid; |
69f287ae CS |
4101 | break; |
4102 | case PF_INET: | |
4103 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4104 | s = skb->secmark; | |
4105 | if (s != 0) | |
4106 | break; | |
4107 | #endif | |
b4e0d5f0 CS |
4108 | /* |
4109 | * Translate what netlabel gave us. | |
4110 | */ | |
272cd7a8 CS |
4111 | if (sock != NULL && sock->sk != NULL) |
4112 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
4113 | netlbl_secattr_init(&secattr); |
4114 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
4115 | if (rc == 0) { | |
2f823ff8 CS |
4116 | skp = smack_from_secattr(&secattr, ssp); |
4117 | s = skp->smk_secid; | |
b4e0d5f0 CS |
4118 | } |
4119 | netlbl_secattr_destroy(&secattr); | |
69f287ae | 4120 | break; |
69f287ae | 4121 | case PF_INET6: |
21abb1ec | 4122 | #ifdef SMACK_IPV6_SECMARK_LABELING |
69f287ae | 4123 | s = skb->secmark; |
21abb1ec | 4124 | #endif |
69f287ae | 4125 | break; |
b4e0d5f0 CS |
4126 | } |
4127 | *secid = s; | |
e114e473 CS |
4128 | if (s == 0) |
4129 | return -EINVAL; | |
e114e473 CS |
4130 | return 0; |
4131 | } | |
4132 | ||
4133 | /** | |
07feee8f PM |
4134 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
4135 | * @sk: child sock | |
4136 | * @parent: parent socket | |
e114e473 | 4137 | * |
07feee8f PM |
4138 | * Set the smk_{in,out} state of an existing sock based on the process that |
4139 | * is creating the new socket. | |
e114e473 CS |
4140 | */ |
4141 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
4142 | { | |
4143 | struct socket_smack *ssp; | |
2f823ff8 | 4144 | struct smack_known *skp = smk_of_current(); |
e114e473 | 4145 | |
07feee8f PM |
4146 | if (sk == NULL || |
4147 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
4148 | return; |
4149 | ||
4150 | ssp = sk->sk_security; | |
54e70ec5 | 4151 | ssp->smk_in = skp; |
2f823ff8 | 4152 | ssp->smk_out = skp; |
07feee8f | 4153 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
4154 | } |
4155 | ||
4156 | /** | |
4157 | * smack_inet_conn_request - Smack access check on connect | |
4158 | * @sk: socket involved | |
4159 | * @skb: packet | |
4160 | * @req: unused | |
4161 | * | |
4162 | * Returns 0 if a task with the packet label could write to | |
4163 | * the socket, otherwise an error code | |
4164 | */ | |
4165 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
4166 | struct request_sock *req) | |
4167 | { | |
07feee8f | 4168 | u16 family = sk->sk_family; |
f7112e6c | 4169 | struct smack_known *skp; |
e114e473 | 4170 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
4171 | struct netlbl_lsm_secattr secattr; |
4172 | struct sockaddr_in addr; | |
4173 | struct iphdr *hdr; | |
21c7eae2 | 4174 | struct smack_known *hskp; |
e114e473 | 4175 | int rc; |
ecfcc53f | 4176 | struct smk_audit_info ad; |
923e9a13 | 4177 | #ifdef CONFIG_AUDIT |
48c62af6 | 4178 | struct lsm_network_audit net; |
923e9a13 | 4179 | #endif |
e114e473 | 4180 | |
69f287ae | 4181 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 CS |
4182 | if (family == PF_INET6) { |
4183 | /* | |
4184 | * Handle mapped IPv4 packets arriving | |
4185 | * via IPv6 sockets. Don't set up netlabel | |
4186 | * processing on IPv6. | |
4187 | */ | |
4188 | if (skb->protocol == htons(ETH_P_IP)) | |
4189 | family = PF_INET; | |
4190 | else | |
4191 | return 0; | |
4192 | } | |
69f287ae | 4193 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4194 | |
7f368ad3 CS |
4195 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4196 | /* | |
4197 | * If there is a secmark use it rather than the CIPSO label. | |
4198 | * If there is no secmark fall back to CIPSO. | |
4199 | * The secmark is assumed to reflect policy better. | |
4200 | */ | |
4201 | if (skb && skb->secmark != 0) { | |
4202 | skp = smack_from_secid(skb->secmark); | |
4203 | goto access_check; | |
4204 | } | |
4205 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
4206 | ||
07feee8f PM |
4207 | netlbl_secattr_init(&secattr); |
4208 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 4209 | if (rc == 0) |
2f823ff8 | 4210 | skp = smack_from_secattr(&secattr, ssp); |
e114e473 | 4211 | else |
2f823ff8 | 4212 | skp = &smack_known_huh; |
07feee8f PM |
4213 | netlbl_secattr_destroy(&secattr); |
4214 | ||
7f368ad3 CS |
4215 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4216 | access_check: | |
4217 | #endif | |
4218 | ||
ecfcc53f | 4219 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
4220 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
4221 | ad.a.u.net->family = family; | |
4222 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
4223 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
4224 | #endif | |
e114e473 | 4225 | /* |
07feee8f PM |
4226 | * Receiving a packet requires that the other end be able to write |
4227 | * here. Read access is not required. | |
e114e473 | 4228 | */ |
21c7eae2 LP |
4229 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
4230 | rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc); | |
07feee8f PM |
4231 | if (rc != 0) |
4232 | return rc; | |
4233 | ||
4234 | /* | |
4235 | * Save the peer's label in the request_sock so we can later setup | |
4236 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
4237 | */ | |
2f823ff8 | 4238 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
4239 | |
4240 | /* | |
4241 | * We need to decide if we want to label the incoming connection here | |
4242 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 4243 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
4244 | */ |
4245 | hdr = ip_hdr(skb); | |
4246 | addr.sin_addr.s_addr = hdr->saddr; | |
4247 | rcu_read_lock(); | |
21abb1ec | 4248 | hskp = smack_ipv4host_label(&addr); |
f7112e6c CS |
4249 | rcu_read_unlock(); |
4250 | ||
21c7eae2 | 4251 | if (hskp == NULL) |
f7112e6c | 4252 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 4253 | else |
07feee8f | 4254 | netlbl_req_delattr(req); |
e114e473 CS |
4255 | |
4256 | return rc; | |
4257 | } | |
4258 | ||
07feee8f PM |
4259 | /** |
4260 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
4261 | * @sk: the new socket | |
4262 | * @req: the connection's request_sock | |
4263 | * | |
4264 | * Transfer the connection's peer label to the newly created socket. | |
4265 | */ | |
4266 | static void smack_inet_csk_clone(struct sock *sk, | |
4267 | const struct request_sock *req) | |
4268 | { | |
4269 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 4270 | struct smack_known *skp; |
07feee8f | 4271 | |
2f823ff8 CS |
4272 | if (req->peer_secid != 0) { |
4273 | skp = smack_from_secid(req->peer_secid); | |
54e70ec5 | 4274 | ssp->smk_packet = skp; |
2f823ff8 | 4275 | } else |
272cd7a8 | 4276 | ssp->smk_packet = NULL; |
07feee8f PM |
4277 | } |
4278 | ||
e114e473 CS |
4279 | /* |
4280 | * Key management security hooks | |
4281 | * | |
4282 | * Casey has not tested key support very heavily. | |
4283 | * The permission check is most likely too restrictive. | |
4284 | * If you care about keys please have a look. | |
4285 | */ | |
4286 | #ifdef CONFIG_KEYS | |
4287 | ||
4288 | /** | |
4289 | * smack_key_alloc - Set the key security blob | |
4290 | * @key: object | |
d84f4f99 | 4291 | * @cred: the credentials to use |
e114e473 CS |
4292 | * @flags: unused |
4293 | * | |
4294 | * No allocation required | |
4295 | * | |
4296 | * Returns 0 | |
4297 | */ | |
d84f4f99 | 4298 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
4299 | unsigned long flags) |
4300 | { | |
2f823ff8 CS |
4301 | struct smack_known *skp = smk_of_task(cred->security); |
4302 | ||
21c7eae2 | 4303 | key->security = skp; |
e114e473 CS |
4304 | return 0; |
4305 | } | |
4306 | ||
4307 | /** | |
4308 | * smack_key_free - Clear the key security blob | |
4309 | * @key: the object | |
4310 | * | |
4311 | * Clear the blob pointer | |
4312 | */ | |
4313 | static void smack_key_free(struct key *key) | |
4314 | { | |
4315 | key->security = NULL; | |
4316 | } | |
4317 | ||
1a28979b | 4318 | /** |
e114e473 CS |
4319 | * smack_key_permission - Smack access on a key |
4320 | * @key_ref: gets to the object | |
d84f4f99 | 4321 | * @cred: the credentials to use |
1a28979b | 4322 | * @perm: requested key permissions |
e114e473 CS |
4323 | * |
4324 | * Return 0 if the task has read and write to the object, | |
4325 | * an error code otherwise | |
4326 | */ | |
4327 | static int smack_key_permission(key_ref_t key_ref, | |
f5895943 | 4328 | const struct cred *cred, unsigned perm) |
e114e473 CS |
4329 | { |
4330 | struct key *keyp; | |
ecfcc53f | 4331 | struct smk_audit_info ad; |
2f823ff8 | 4332 | struct smack_known *tkp = smk_of_task(cred->security); |
fffea214 | 4333 | int request = 0; |
d166c802 | 4334 | int rc; |
e114e473 CS |
4335 | |
4336 | keyp = key_ref_to_ptr(key_ref); | |
4337 | if (keyp == NULL) | |
4338 | return -EINVAL; | |
4339 | /* | |
4340 | * If the key hasn't been initialized give it access so that | |
4341 | * it may do so. | |
4342 | */ | |
4343 | if (keyp->security == NULL) | |
4344 | return 0; | |
4345 | /* | |
4346 | * This should not occur | |
4347 | */ | |
2f823ff8 | 4348 | if (tkp == NULL) |
e114e473 | 4349 | return -EACCES; |
d19dfe58 CS |
4350 | |
4351 | if (smack_privileged_cred(CAP_MAC_OVERRIDE, cred)) | |
4352 | return 0; | |
4353 | ||
ecfcc53f EB |
4354 | #ifdef CONFIG_AUDIT |
4355 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
4356 | ad.a.u.key_struct.key = keyp->serial; | |
4357 | ad.a.u.key_struct.key_desc = keyp->description; | |
4358 | #endif | |
fffea214 DK |
4359 | if (perm & KEY_NEED_READ) |
4360 | request = MAY_READ; | |
4361 | if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR)) | |
4362 | request = MAY_WRITE; | |
d166c802 CS |
4363 | rc = smk_access(tkp, keyp->security, request, &ad); |
4364 | rc = smk_bu_note("key access", tkp, keyp->security, request, rc); | |
4365 | return rc; | |
e114e473 | 4366 | } |
7fc5f36e JB |
4367 | |
4368 | /* | |
4369 | * smack_key_getsecurity - Smack label tagging the key | |
4370 | * @key points to the key to be queried | |
4371 | * @_buffer points to a pointer that should be set to point to the | |
4372 | * resulting string (if no label or an error occurs). | |
4373 | * Return the length of the string (including terminating NUL) or -ve if | |
4374 | * an error. | |
4375 | * May also return 0 (and a NULL buffer pointer) if there is no label. | |
4376 | */ | |
4377 | static int smack_key_getsecurity(struct key *key, char **_buffer) | |
4378 | { | |
4379 | struct smack_known *skp = key->security; | |
4380 | size_t length; | |
4381 | char *copy; | |
4382 | ||
4383 | if (key->security == NULL) { | |
4384 | *_buffer = NULL; | |
4385 | return 0; | |
4386 | } | |
4387 | ||
4388 | copy = kstrdup(skp->smk_known, GFP_KERNEL); | |
4389 | if (copy == NULL) | |
4390 | return -ENOMEM; | |
4391 | length = strlen(copy) + 1; | |
4392 | ||
4393 | *_buffer = copy; | |
4394 | return length; | |
4395 | } | |
4396 | ||
e114e473 CS |
4397 | #endif /* CONFIG_KEYS */ |
4398 | ||
d20bdda6 AD |
4399 | /* |
4400 | * Smack Audit hooks | |
4401 | * | |
4402 | * Audit requires a unique representation of each Smack specific | |
4403 | * rule. This unique representation is used to distinguish the | |
4404 | * object to be audited from remaining kernel objects and also | |
4405 | * works as a glue between the audit hooks. | |
4406 | * | |
4407 | * Since repository entries are added but never deleted, we'll use | |
4408 | * the smack_known label address related to the given audit rule as | |
4409 | * the needed unique representation. This also better fits the smack | |
4410 | * model where nearly everything is a label. | |
4411 | */ | |
4412 | #ifdef CONFIG_AUDIT | |
4413 | ||
4414 | /** | |
4415 | * smack_audit_rule_init - Initialize a smack audit rule | |
4416 | * @field: audit rule fields given from user-space (audit.h) | |
4417 | * @op: required testing operator (=, !=, >, <, ...) | |
4418 | * @rulestr: smack label to be audited | |
4419 | * @vrule: pointer to save our own audit rule representation | |
4420 | * | |
4421 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
4422 | * The label to be audited is created if necessay. | |
4423 | */ | |
4424 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
4425 | { | |
21c7eae2 | 4426 | struct smack_known *skp; |
d20bdda6 AD |
4427 | char **rule = (char **)vrule; |
4428 | *rule = NULL; | |
4429 | ||
4430 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4431 | return -EINVAL; | |
4432 | ||
5af75d8d | 4433 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
4434 | return -EINVAL; |
4435 | ||
21c7eae2 | 4436 | skp = smk_import_entry(rulestr, 0); |
e774ad68 LP |
4437 | if (IS_ERR(skp)) |
4438 | return PTR_ERR(skp); | |
4439 | ||
4440 | *rule = skp->smk_known; | |
d20bdda6 AD |
4441 | |
4442 | return 0; | |
4443 | } | |
4444 | ||
4445 | /** | |
4446 | * smack_audit_rule_known - Distinguish Smack audit rules | |
4447 | * @krule: rule of interest, in Audit kernel representation format | |
4448 | * | |
4449 | * This is used to filter Smack rules from remaining Audit ones. | |
4450 | * If it's proved that this rule belongs to us, the | |
4451 | * audit_rule_match hook will be called to do the final judgement. | |
4452 | */ | |
4453 | static int smack_audit_rule_known(struct audit_krule *krule) | |
4454 | { | |
4455 | struct audit_field *f; | |
4456 | int i; | |
4457 | ||
4458 | for (i = 0; i < krule->field_count; i++) { | |
4459 | f = &krule->fields[i]; | |
4460 | ||
4461 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
4462 | return 1; | |
4463 | } | |
4464 | ||
4465 | return 0; | |
4466 | } | |
4467 | ||
4468 | /** | |
4469 | * smack_audit_rule_match - Audit given object ? | |
4470 | * @secid: security id for identifying the object to test | |
4471 | * @field: audit rule flags given from user-space | |
4472 | * @op: required testing operator | |
4473 | * @vrule: smack internal rule presentation | |
4474 | * @actx: audit context associated with the check | |
4475 | * | |
4476 | * The core Audit hook. It's used to take the decision of | |
4477 | * whether to audit or not to audit a given object. | |
4478 | */ | |
4479 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
4480 | struct audit_context *actx) | |
4481 | { | |
2f823ff8 | 4482 | struct smack_known *skp; |
d20bdda6 AD |
4483 | char *rule = vrule; |
4484 | ||
4eb0f4ab RGB |
4485 | if (unlikely(!rule)) { |
4486 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
4487 | return -ENOENT; |
4488 | } | |
4489 | ||
4490 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4491 | return 0; | |
4492 | ||
2f823ff8 | 4493 | skp = smack_from_secid(secid); |
d20bdda6 AD |
4494 | |
4495 | /* | |
4496 | * No need to do string comparisons. If a match occurs, | |
4497 | * both pointers will point to the same smack_known | |
4498 | * label. | |
4499 | */ | |
5af75d8d | 4500 | if (op == Audit_equal) |
2f823ff8 | 4501 | return (rule == skp->smk_known); |
5af75d8d | 4502 | if (op == Audit_not_equal) |
2f823ff8 | 4503 | return (rule != skp->smk_known); |
d20bdda6 AD |
4504 | |
4505 | return 0; | |
4506 | } | |
4507 | ||
491a0b08 CS |
4508 | /* |
4509 | * There is no need for a smack_audit_rule_free hook. | |
d20bdda6 AD |
4510 | * No memory was allocated. |
4511 | */ | |
d20bdda6 AD |
4512 | |
4513 | #endif /* CONFIG_AUDIT */ | |
4514 | ||
746df9b5 DQ |
4515 | /** |
4516 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
4517 | * @name: Full xattr name to check. | |
4518 | */ | |
4519 | static int smack_ismaclabel(const char *name) | |
4520 | { | |
4521 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
4522 | } | |
4523 | ||
4524 | ||
251a2a95 | 4525 | /** |
e114e473 CS |
4526 | * smack_secid_to_secctx - return the smack label for a secid |
4527 | * @secid: incoming integer | |
4528 | * @secdata: destination | |
4529 | * @seclen: how long it is | |
4530 | * | |
4531 | * Exists for networking code. | |
4532 | */ | |
4533 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
4534 | { | |
2f823ff8 | 4535 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 4536 | |
d5630b9d | 4537 | if (secdata) |
2f823ff8 CS |
4538 | *secdata = skp->smk_known; |
4539 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
4540 | return 0; |
4541 | } | |
4542 | ||
251a2a95 | 4543 | /** |
4bc87e62 CS |
4544 | * smack_secctx_to_secid - return the secid for a smack label |
4545 | * @secdata: smack label | |
4546 | * @seclen: how long result is | |
4547 | * @secid: outgoing integer | |
4548 | * | |
4549 | * Exists for audit and networking code. | |
4550 | */ | |
e52c1764 | 4551 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 | 4552 | { |
21c7eae2 LP |
4553 | struct smack_known *skp = smk_find_entry(secdata); |
4554 | ||
4555 | if (skp) | |
4556 | *secid = skp->smk_secid; | |
4557 | else | |
4558 | *secid = 0; | |
4bc87e62 CS |
4559 | return 0; |
4560 | } | |
4561 | ||
491a0b08 CS |
4562 | /* |
4563 | * There used to be a smack_release_secctx hook | |
4564 | * that did nothing back when hooks were in a vector. | |
4565 | * Now that there's a list such a hook adds cost. | |
e114e473 | 4566 | */ |
e114e473 | 4567 | |
1ee65e37 DQ |
4568 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
4569 | { | |
4570 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
4571 | } | |
4572 | ||
4573 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
4574 | { | |
4575 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
4576 | } | |
4577 | ||
4578 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
4579 | { | |
0f8983cf | 4580 | struct smack_known *skp = smk_of_inode(inode); |
1ee65e37 | 4581 | |
0f8983cf CS |
4582 | *ctx = skp->smk_known; |
4583 | *ctxlen = strlen(skp->smk_known); | |
1ee65e37 DQ |
4584 | return 0; |
4585 | } | |
4586 | ||
d6d80cb5 CS |
4587 | static int smack_inode_copy_up(struct dentry *dentry, struct cred **new) |
4588 | { | |
4589 | ||
4590 | struct task_smack *tsp; | |
4591 | struct smack_known *skp; | |
4592 | struct inode_smack *isp; | |
4593 | struct cred *new_creds = *new; | |
4594 | ||
4595 | if (new_creds == NULL) { | |
4596 | new_creds = prepare_creds(); | |
4597 | if (new_creds == NULL) | |
4598 | return -ENOMEM; | |
4599 | } | |
4600 | ||
4601 | tsp = new_creds->security; | |
4602 | ||
4603 | /* | |
4604 | * Get label from overlay inode and set it in create_sid | |
4605 | */ | |
4606 | isp = d_inode(dentry->d_parent)->i_security; | |
4607 | skp = isp->smk_inode; | |
4608 | tsp->smk_task = skp; | |
4609 | *new = new_creds; | |
4610 | return 0; | |
4611 | } | |
4612 | ||
4613 | static int smack_inode_copy_up_xattr(const char *name) | |
4614 | { | |
4615 | /* | |
4616 | * Return 1 if this is the smack access Smack attribute. | |
4617 | */ | |
4618 | if (strcmp(name, XATTR_NAME_SMACK) == 0) | |
4619 | return 1; | |
4620 | ||
4621 | return -EOPNOTSUPP; | |
4622 | } | |
4623 | ||
4624 | static int smack_dentry_create_files_as(struct dentry *dentry, int mode, | |
4625 | struct qstr *name, | |
4626 | const struct cred *old, | |
4627 | struct cred *new) | |
4628 | { | |
4629 | struct task_smack *otsp = old->security; | |
4630 | struct task_smack *ntsp = new->security; | |
4631 | struct inode_smack *isp; | |
4632 | int may; | |
4633 | ||
4634 | /* | |
4635 | * Use the process credential unless all of | |
4636 | * the transmuting criteria are met | |
4637 | */ | |
4638 | ntsp->smk_task = otsp->smk_task; | |
4639 | ||
4640 | /* | |
4641 | * the attribute of the containing directory | |
4642 | */ | |
4643 | isp = d_inode(dentry->d_parent)->i_security; | |
4644 | ||
4645 | if (isp->smk_flags & SMK_INODE_TRANSMUTE) { | |
4646 | rcu_read_lock(); | |
4647 | may = smk_access_entry(otsp->smk_task->smk_known, | |
4648 | isp->smk_inode->smk_known, | |
4649 | &otsp->smk_task->smk_rules); | |
4650 | rcu_read_unlock(); | |
4651 | ||
4652 | /* | |
4653 | * If the directory is transmuting and the rule | |
4654 | * providing access is transmuting use the containing | |
4655 | * directory label instead of the process label. | |
4656 | */ | |
4657 | if (may > 0 && (may & MAY_TRANSMUTE)) | |
4658 | ntsp->smk_task = isp->smk_inode; | |
4659 | } | |
4660 | return 0; | |
4661 | } | |
4662 | ||
ca97d939 | 4663 | static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
4664 | LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check), |
4665 | LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme), | |
4666 | LSM_HOOK_INIT(syslog, smack_syslog), | |
4667 | ||
4668 | LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security), | |
4669 | LSM_HOOK_INIT(sb_free_security, smack_sb_free_security), | |
4670 | LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data), | |
4671 | LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount), | |
4672 | LSM_HOOK_INIT(sb_statfs, smack_sb_statfs), | |
3bf2789c VT |
4673 | LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts), |
4674 | LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str), | |
e20b043a CS |
4675 | |
4676 | LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds), | |
e20b043a CS |
4677 | |
4678 | LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security), | |
4679 | LSM_HOOK_INIT(inode_free_security, smack_inode_free_security), | |
4680 | LSM_HOOK_INIT(inode_init_security, smack_inode_init_security), | |
4681 | LSM_HOOK_INIT(inode_link, smack_inode_link), | |
4682 | LSM_HOOK_INIT(inode_unlink, smack_inode_unlink), | |
4683 | LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir), | |
4684 | LSM_HOOK_INIT(inode_rename, smack_inode_rename), | |
4685 | LSM_HOOK_INIT(inode_permission, smack_inode_permission), | |
4686 | LSM_HOOK_INIT(inode_setattr, smack_inode_setattr), | |
4687 | LSM_HOOK_INIT(inode_getattr, smack_inode_getattr), | |
4688 | LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr), | |
4689 | LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr), | |
4690 | LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr), | |
4691 | LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr), | |
4692 | LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity), | |
4693 | LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity), | |
4694 | LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity), | |
4695 | LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid), | |
4696 | ||
e20b043a CS |
4697 | LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security), |
4698 | LSM_HOOK_INIT(file_free_security, smack_file_free_security), | |
4699 | LSM_HOOK_INIT(file_ioctl, smack_file_ioctl), | |
4700 | LSM_HOOK_INIT(file_lock, smack_file_lock), | |
4701 | LSM_HOOK_INIT(file_fcntl, smack_file_fcntl), | |
4702 | LSM_HOOK_INIT(mmap_file, smack_mmap_file), | |
4703 | LSM_HOOK_INIT(mmap_addr, cap_mmap_addr), | |
4704 | LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner), | |
4705 | LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask), | |
4706 | LSM_HOOK_INIT(file_receive, smack_file_receive), | |
4707 | ||
4708 | LSM_HOOK_INIT(file_open, smack_file_open), | |
4709 | ||
4710 | LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank), | |
4711 | LSM_HOOK_INIT(cred_free, smack_cred_free), | |
4712 | LSM_HOOK_INIT(cred_prepare, smack_cred_prepare), | |
4713 | LSM_HOOK_INIT(cred_transfer, smack_cred_transfer), | |
3ec30113 | 4714 | LSM_HOOK_INIT(cred_getsecid, smack_cred_getsecid), |
e20b043a CS |
4715 | LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as), |
4716 | LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as), | |
4717 | LSM_HOOK_INIT(task_setpgid, smack_task_setpgid), | |
4718 | LSM_HOOK_INIT(task_getpgid, smack_task_getpgid), | |
4719 | LSM_HOOK_INIT(task_getsid, smack_task_getsid), | |
4720 | LSM_HOOK_INIT(task_getsecid, smack_task_getsecid), | |
4721 | LSM_HOOK_INIT(task_setnice, smack_task_setnice), | |
4722 | LSM_HOOK_INIT(task_setioprio, smack_task_setioprio), | |
4723 | LSM_HOOK_INIT(task_getioprio, smack_task_getioprio), | |
4724 | LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler), | |
4725 | LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler), | |
4726 | LSM_HOOK_INIT(task_movememory, smack_task_movememory), | |
4727 | LSM_HOOK_INIT(task_kill, smack_task_kill), | |
e20b043a CS |
4728 | LSM_HOOK_INIT(task_to_inode, smack_task_to_inode), |
4729 | ||
4730 | LSM_HOOK_INIT(ipc_permission, smack_ipc_permission), | |
4731 | LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid), | |
4732 | ||
4733 | LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security), | |
4734 | LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security), | |
4735 | ||
0d79cbf8 EB |
4736 | LSM_HOOK_INIT(msg_queue_alloc_security, smack_ipc_alloc_security), |
4737 | LSM_HOOK_INIT(msg_queue_free_security, smack_ipc_free_security), | |
e20b043a CS |
4738 | LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate), |
4739 | LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl), | |
4740 | LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd), | |
4741 | LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv), | |
4742 | ||
0d79cbf8 EB |
4743 | LSM_HOOK_INIT(shm_alloc_security, smack_ipc_alloc_security), |
4744 | LSM_HOOK_INIT(shm_free_security, smack_ipc_free_security), | |
e20b043a CS |
4745 | LSM_HOOK_INIT(shm_associate, smack_shm_associate), |
4746 | LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl), | |
4747 | LSM_HOOK_INIT(shm_shmat, smack_shm_shmat), | |
4748 | ||
0d79cbf8 EB |
4749 | LSM_HOOK_INIT(sem_alloc_security, smack_ipc_alloc_security), |
4750 | LSM_HOOK_INIT(sem_free_security, smack_ipc_free_security), | |
e20b043a CS |
4751 | LSM_HOOK_INIT(sem_associate, smack_sem_associate), |
4752 | LSM_HOOK_INIT(sem_semctl, smack_sem_semctl), | |
4753 | LSM_HOOK_INIT(sem_semop, smack_sem_semop), | |
4754 | ||
4755 | LSM_HOOK_INIT(d_instantiate, smack_d_instantiate), | |
4756 | ||
4757 | LSM_HOOK_INIT(getprocattr, smack_getprocattr), | |
4758 | LSM_HOOK_INIT(setprocattr, smack_setprocattr), | |
4759 | ||
4760 | LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect), | |
4761 | LSM_HOOK_INIT(unix_may_send, smack_unix_may_send), | |
4762 | ||
4763 | LSM_HOOK_INIT(socket_post_create, smack_socket_post_create), | |
5859cdf5 | 4764 | LSM_HOOK_INIT(socket_socketpair, smack_socket_socketpair), |
21abb1ec | 4765 | #ifdef SMACK_IPV6_PORT_LABELING |
e20b043a | 4766 | LSM_HOOK_INIT(socket_bind, smack_socket_bind), |
21abb1ec | 4767 | #endif |
e20b043a CS |
4768 | LSM_HOOK_INIT(socket_connect, smack_socket_connect), |
4769 | LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg), | |
4770 | LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb), | |
4771 | LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream), | |
4772 | LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram), | |
4773 | LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security), | |
4774 | LSM_HOOK_INIT(sk_free_security, smack_sk_free_security), | |
4775 | LSM_HOOK_INIT(sock_graft, smack_sock_graft), | |
4776 | LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request), | |
4777 | LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone), | |
d20bdda6 | 4778 | |
e114e473 CS |
4779 | /* key management security hooks */ |
4780 | #ifdef CONFIG_KEYS | |
e20b043a CS |
4781 | LSM_HOOK_INIT(key_alloc, smack_key_alloc), |
4782 | LSM_HOOK_INIT(key_free, smack_key_free), | |
4783 | LSM_HOOK_INIT(key_permission, smack_key_permission), | |
4784 | LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity), | |
e114e473 | 4785 | #endif /* CONFIG_KEYS */ |
d20bdda6 AD |
4786 | |
4787 | /* Audit hooks */ | |
4788 | #ifdef CONFIG_AUDIT | |
e20b043a CS |
4789 | LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init), |
4790 | LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known), | |
4791 | LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match), | |
d20bdda6 AD |
4792 | #endif /* CONFIG_AUDIT */ |
4793 | ||
e20b043a CS |
4794 | LSM_HOOK_INIT(ismaclabel, smack_ismaclabel), |
4795 | LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx), | |
4796 | LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid), | |
e20b043a CS |
4797 | LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx), |
4798 | LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx), | |
4799 | LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx), | |
d6d80cb5 CS |
4800 | LSM_HOOK_INIT(inode_copy_up, smack_inode_copy_up), |
4801 | LSM_HOOK_INIT(inode_copy_up_xattr, smack_inode_copy_up_xattr), | |
4802 | LSM_HOOK_INIT(dentry_create_files_as, smack_dentry_create_files_as), | |
e114e473 CS |
4803 | }; |
4804 | ||
7198e2ee | 4805 | |
86812bb0 | 4806 | static __init void init_smack_known_list(void) |
7198e2ee | 4807 | { |
86812bb0 CS |
4808 | /* |
4809 | * Initialize rule list locks | |
4810 | */ | |
4811 | mutex_init(&smack_known_huh.smk_rules_lock); | |
4812 | mutex_init(&smack_known_hat.smk_rules_lock); | |
4813 | mutex_init(&smack_known_floor.smk_rules_lock); | |
4814 | mutex_init(&smack_known_star.smk_rules_lock); | |
86812bb0 CS |
4815 | mutex_init(&smack_known_web.smk_rules_lock); |
4816 | /* | |
4817 | * Initialize rule lists | |
4818 | */ | |
4819 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
4820 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
4821 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
4822 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
86812bb0 CS |
4823 | INIT_LIST_HEAD(&smack_known_web.smk_rules); |
4824 | /* | |
4825 | * Create the known labels list | |
4826 | */ | |
4d7cf4a1 TS |
4827 | smk_insert_entry(&smack_known_huh); |
4828 | smk_insert_entry(&smack_known_hat); | |
4829 | smk_insert_entry(&smack_known_star); | |
4830 | smk_insert_entry(&smack_known_floor); | |
4d7cf4a1 | 4831 | smk_insert_entry(&smack_known_web); |
7198e2ee EB |
4832 | } |
4833 | ||
e114e473 CS |
4834 | /** |
4835 | * smack_init - initialize the smack system | |
4836 | * | |
4837 | * Returns 0 | |
4838 | */ | |
4839 | static __init int smack_init(void) | |
4840 | { | |
d84f4f99 | 4841 | struct cred *cred; |
676dac4b | 4842 | struct task_smack *tsp; |
d84f4f99 | 4843 | |
b1d9e6b0 | 4844 | if (!security_module_enable("smack")) |
7898e1f8 CS |
4845 | return 0; |
4846 | ||
1a5b472b R |
4847 | smack_inode_cache = KMEM_CACHE(inode_smack, 0); |
4848 | if (!smack_inode_cache) | |
4849 | return -ENOMEM; | |
4850 | ||
2f823ff8 CS |
4851 | tsp = new_task_smack(&smack_known_floor, &smack_known_floor, |
4852 | GFP_KERNEL); | |
1a5b472b R |
4853 | if (tsp == NULL) { |
4854 | kmem_cache_destroy(smack_inode_cache); | |
676dac4b | 4855 | return -ENOMEM; |
1a5b472b | 4856 | } |
676dac4b | 4857 | |
d21b7b04 JB |
4858 | smack_enabled = 1; |
4859 | ||
21abb1ec CS |
4860 | pr_info("Smack: Initializing.\n"); |
4861 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4862 | pr_info("Smack: Netfilter enabled.\n"); | |
4863 | #endif | |
4864 | #ifdef SMACK_IPV6_PORT_LABELING | |
4865 | pr_info("Smack: IPv6 port labeling enabled.\n"); | |
4866 | #endif | |
4867 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
4868 | pr_info("Smack: IPv6 Netfilter enabled.\n"); | |
4869 | #endif | |
e114e473 CS |
4870 | |
4871 | /* | |
4872 | * Set the security state for the initial task. | |
4873 | */ | |
d84f4f99 | 4874 | cred = (struct cred *) current->cred; |
676dac4b | 4875 | cred->security = tsp; |
e114e473 | 4876 | |
86812bb0 CS |
4877 | /* initialize the smack_known_list */ |
4878 | init_smack_known_list(); | |
e114e473 CS |
4879 | |
4880 | /* | |
4881 | * Register with LSM | |
4882 | */ | |
d69dece5 | 4883 | security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack"); |
e114e473 CS |
4884 | |
4885 | return 0; | |
4886 | } | |
4887 | ||
4888 | /* | |
4889 | * Smack requires early initialization in order to label | |
4890 | * all processes and objects when they are created. | |
4891 | */ | |
3d6e5f6d | 4892 | DEFINE_LSM(smack) = { |
07aed2f2 | 4893 | .name = "smack", |
3d6e5f6d KC |
4894 | .init = smack_init, |
4895 | }; |