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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> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
e114e473 CS |
32 | #include <linux/mutex.h> |
33 | #include <linux/pipe_fs_i.h> | |
e114e473 | 34 | #include <net/cipso_ipv4.h> |
c6739443 CS |
35 | #include <net/ip.h> |
36 | #include <net/ipv6.h> | |
d20bdda6 | 37 | #include <linux/audit.h> |
1fd7317d | 38 | #include <linux/magic.h> |
2a7dba39 | 39 | #include <linux/dcache.h> |
16014d87 | 40 | #include <linux/personality.h> |
40401530 AV |
41 | #include <linux/msg.h> |
42 | #include <linux/shm.h> | |
43 | #include <linux/binfmts.h> | |
3bf2789c | 44 | #include <linux/parser.h> |
e114e473 CS |
45 | #include "smack.h" |
46 | ||
5c6d1125 JS |
47 | #define TRANS_TRUE "TRUE" |
48 | #define TRANS_TRUE_SIZE 4 | |
49 | ||
c6739443 CS |
50 | #define SMK_CONNECTING 0 |
51 | #define SMK_RECEIVING 1 | |
52 | #define SMK_SENDING 2 | |
53 | ||
21abb1ec | 54 | #ifdef SMACK_IPV6_PORT_LABELING |
8b549ef4 | 55 | static LIST_HEAD(smk_ipv6_port_list); |
21abb1ec | 56 | #endif |
1a5b472b | 57 | static struct kmem_cache *smack_inode_cache; |
69f287ae | 58 | int smack_enabled; |
c6739443 | 59 | |
3d04c924 | 60 | static const match_table_t smk_mount_tokens = { |
3bf2789c VT |
61 | {Opt_fsdefault, SMK_FSDEFAULT "%s"}, |
62 | {Opt_fsfloor, SMK_FSFLOOR "%s"}, | |
63 | {Opt_fshat, SMK_FSHAT "%s"}, | |
64 | {Opt_fsroot, SMK_FSROOT "%s"}, | |
65 | {Opt_fstransmute, SMK_FSTRANS "%s"}, | |
66 | {Opt_error, NULL}, | |
67 | }; | |
68 | ||
3d04c924 CS |
69 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
70 | static char *smk_bu_mess[] = { | |
71 | "Bringup Error", /* Unused */ | |
72 | "Bringup", /* SMACK_BRINGUP_ALLOW */ | |
73 | "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */ | |
74 | "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */ | |
75 | }; | |
76 | ||
d166c802 CS |
77 | static void smk_bu_mode(int mode, char *s) |
78 | { | |
79 | int i = 0; | |
80 | ||
81 | if (mode & MAY_READ) | |
82 | s[i++] = 'r'; | |
83 | if (mode & MAY_WRITE) | |
84 | s[i++] = 'w'; | |
85 | if (mode & MAY_EXEC) | |
86 | s[i++] = 'x'; | |
87 | if (mode & MAY_APPEND) | |
88 | s[i++] = 'a'; | |
89 | if (mode & MAY_TRANSMUTE) | |
90 | s[i++] = 't'; | |
91 | if (mode & MAY_LOCK) | |
92 | s[i++] = 'l'; | |
93 | if (i == 0) | |
94 | s[i++] = '-'; | |
95 | s[i] = '\0'; | |
96 | } | |
97 | #endif | |
98 | ||
99 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
100 | static int smk_bu_note(char *note, struct smack_known *sskp, |
101 | struct smack_known *oskp, int mode, int rc) | |
d166c802 CS |
102 | { |
103 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
104 | ||
105 | if (rc <= 0) | |
106 | return rc; | |
bf4b2fee CS |
107 | if (rc > SMACK_UNCONFINED_OBJECT) |
108 | rc = 0; | |
d166c802 CS |
109 | |
110 | smk_bu_mode(mode, acc); | |
bf4b2fee | 111 | pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc], |
21c7eae2 | 112 | sskp->smk_known, oskp->smk_known, acc, note); |
d166c802 CS |
113 | return 0; |
114 | } | |
115 | #else | |
21c7eae2 | 116 | #define smk_bu_note(note, sskp, oskp, mode, RC) (RC) |
d166c802 CS |
117 | #endif |
118 | ||
119 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
120 | static int smk_bu_current(char *note, struct smack_known *oskp, |
121 | int mode, int rc) | |
d166c802 CS |
122 | { |
123 | struct task_smack *tsp = current_security(); | |
124 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
125 | ||
126 | if (rc <= 0) | |
127 | return rc; | |
bf4b2fee CS |
128 | if (rc > SMACK_UNCONFINED_OBJECT) |
129 | rc = 0; | |
d166c802 CS |
130 | |
131 | smk_bu_mode(mode, acc); | |
bf4b2fee | 132 | pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc], |
21c7eae2 LP |
133 | tsp->smk_task->smk_known, oskp->smk_known, |
134 | acc, current->comm, note); | |
d166c802 CS |
135 | return 0; |
136 | } | |
137 | #else | |
21c7eae2 | 138 | #define smk_bu_current(note, oskp, mode, RC) (RC) |
d166c802 CS |
139 | #endif |
140 | ||
141 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
142 | static int smk_bu_task(struct task_struct *otp, int mode, int rc) | |
143 | { | |
144 | struct task_smack *tsp = current_security(); | |
6d1cff2a | 145 | struct smack_known *smk_task = smk_of_task_struct(otp); |
d166c802 CS |
146 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
147 | ||
148 | if (rc <= 0) | |
149 | return rc; | |
bf4b2fee CS |
150 | if (rc > SMACK_UNCONFINED_OBJECT) |
151 | rc = 0; | |
d166c802 CS |
152 | |
153 | smk_bu_mode(mode, acc); | |
bf4b2fee | 154 | pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc], |
6d1cff2a | 155 | tsp->smk_task->smk_known, smk_task->smk_known, acc, |
d166c802 CS |
156 | current->comm, otp->comm); |
157 | return 0; | |
158 | } | |
159 | #else | |
160 | #define smk_bu_task(otp, mode, RC) (RC) | |
161 | #endif | |
162 | ||
163 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
164 | static int smk_bu_inode(struct inode *inode, int mode, int rc) | |
165 | { | |
166 | struct task_smack *tsp = current_security(); | |
bf4b2fee | 167 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
168 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
169 | ||
bf4b2fee CS |
170 | if (isp->smk_flags & SMK_INODE_IMPURE) |
171 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
172 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
173 | ||
d166c802 CS |
174 | if (rc <= 0) |
175 | return rc; | |
bf4b2fee CS |
176 | if (rc > SMACK_UNCONFINED_OBJECT) |
177 | rc = 0; | |
178 | if (rc == SMACK_UNCONFINED_SUBJECT && | |
179 | (mode & (MAY_WRITE | MAY_APPEND))) | |
180 | isp->smk_flags |= SMK_INODE_IMPURE; | |
d166c802 CS |
181 | |
182 | smk_bu_mode(mode, acc); | |
bf4b2fee CS |
183 | |
184 | pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc], | |
185 | tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc, | |
d166c802 CS |
186 | inode->i_sb->s_id, inode->i_ino, current->comm); |
187 | return 0; | |
188 | } | |
189 | #else | |
190 | #define smk_bu_inode(inode, mode, RC) (RC) | |
191 | #endif | |
192 | ||
193 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
194 | static int smk_bu_file(struct file *file, int mode, int rc) | |
195 | { | |
196 | struct task_smack *tsp = current_security(); | |
197 | struct smack_known *sskp = tsp->smk_task; | |
5e7270a6 | 198 | struct inode *inode = file_inode(file); |
bf4b2fee | 199 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
200 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
201 | ||
bf4b2fee CS |
202 | if (isp->smk_flags & SMK_INODE_IMPURE) |
203 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
204 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
205 | ||
d166c802 CS |
206 | if (rc <= 0) |
207 | return rc; | |
bf4b2fee CS |
208 | if (rc > SMACK_UNCONFINED_OBJECT) |
209 | rc = 0; | |
d166c802 CS |
210 | |
211 | smk_bu_mode(mode, acc); | |
bf4b2fee | 212 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
5e7270a6 | 213 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 214 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
215 | current->comm); |
216 | return 0; | |
217 | } | |
218 | #else | |
219 | #define smk_bu_file(file, mode, RC) (RC) | |
220 | #endif | |
221 | ||
222 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
223 | static int smk_bu_credfile(const struct cred *cred, struct file *file, | |
224 | int mode, int rc) | |
225 | { | |
226 | struct task_smack *tsp = cred->security; | |
227 | struct smack_known *sskp = tsp->smk_task; | |
228 | struct inode *inode = file->f_inode; | |
bf4b2fee | 229 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
230 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
231 | ||
bf4b2fee CS |
232 | if (isp->smk_flags & SMK_INODE_IMPURE) |
233 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
234 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
235 | ||
d166c802 CS |
236 | if (rc <= 0) |
237 | return rc; | |
bf4b2fee CS |
238 | if (rc > SMACK_UNCONFINED_OBJECT) |
239 | rc = 0; | |
d166c802 CS |
240 | |
241 | smk_bu_mode(mode, acc); | |
bf4b2fee | 242 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
21c7eae2 | 243 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 244 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
245 | current->comm); |
246 | return 0; | |
247 | } | |
248 | #else | |
249 | #define smk_bu_credfile(cred, file, mode, RC) (RC) | |
250 | #endif | |
251 | ||
e114e473 CS |
252 | /** |
253 | * smk_fetch - Fetch the smack label from a file. | |
1a28979b | 254 | * @name: type of the label (attribute) |
e114e473 CS |
255 | * @ip: a pointer to the inode |
256 | * @dp: a pointer to the dentry | |
257 | * | |
e774ad68 LP |
258 | * Returns a pointer to the master list entry for the Smack label, |
259 | * NULL if there was no label to fetch, or an error code. | |
e114e473 | 260 | */ |
2f823ff8 CS |
261 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
262 | struct dentry *dp) | |
e114e473 CS |
263 | { |
264 | int rc; | |
f7112e6c | 265 | char *buffer; |
2f823ff8 | 266 | struct smack_known *skp = NULL; |
e114e473 CS |
267 | |
268 | if (ip->i_op->getxattr == NULL) | |
e774ad68 | 269 | return ERR_PTR(-EOPNOTSUPP); |
e114e473 | 270 | |
f7112e6c CS |
271 | buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); |
272 | if (buffer == NULL) | |
e774ad68 | 273 | return ERR_PTR(-ENOMEM); |
e114e473 | 274 | |
ce23e640 | 275 | rc = ip->i_op->getxattr(dp, ip, name, buffer, SMK_LONGLABEL); |
e774ad68 LP |
276 | if (rc < 0) |
277 | skp = ERR_PTR(rc); | |
278 | else if (rc == 0) | |
279 | skp = NULL; | |
280 | else | |
2f823ff8 | 281 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
282 | |
283 | kfree(buffer); | |
284 | ||
2f823ff8 | 285 | return skp; |
e114e473 CS |
286 | } |
287 | ||
288 | /** | |
289 | * new_inode_smack - allocate an inode security blob | |
21c7eae2 | 290 | * @skp: a pointer to the Smack label entry to use in the blob |
e114e473 CS |
291 | * |
292 | * Returns the new blob or NULL if there's no memory available | |
293 | */ | |
1eddfe8e | 294 | static struct inode_smack *new_inode_smack(struct smack_known *skp) |
e114e473 CS |
295 | { |
296 | struct inode_smack *isp; | |
297 | ||
1a5b472b | 298 | isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS); |
e114e473 CS |
299 | if (isp == NULL) |
300 | return NULL; | |
301 | ||
21c7eae2 | 302 | isp->smk_inode = skp; |
e114e473 CS |
303 | isp->smk_flags = 0; |
304 | mutex_init(&isp->smk_lock); | |
305 | ||
306 | return isp; | |
307 | } | |
308 | ||
7898e1f8 CS |
309 | /** |
310 | * new_task_smack - allocate a task security blob | |
1a28979b LP |
311 | * @task: a pointer to the Smack label for the running task |
312 | * @forked: a pointer to the Smack label for the forked task | |
313 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
314 | * |
315 | * Returns the new blob or NULL if there's no memory available | |
316 | */ | |
2f823ff8 CS |
317 | static struct task_smack *new_task_smack(struct smack_known *task, |
318 | struct smack_known *forked, gfp_t gfp) | |
7898e1f8 CS |
319 | { |
320 | struct task_smack *tsp; | |
321 | ||
322 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
323 | if (tsp == NULL) | |
324 | return NULL; | |
325 | ||
326 | tsp->smk_task = task; | |
327 | tsp->smk_forked = forked; | |
328 | INIT_LIST_HEAD(&tsp->smk_rules); | |
38416e53 | 329 | INIT_LIST_HEAD(&tsp->smk_relabel); |
7898e1f8 CS |
330 | mutex_init(&tsp->smk_rules_lock); |
331 | ||
332 | return tsp; | |
333 | } | |
334 | ||
335 | /** | |
336 | * smk_copy_rules - copy a rule set | |
1a28979b LP |
337 | * @nhead: new rules header pointer |
338 | * @ohead: old rules header pointer | |
339 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
340 | * |
341 | * Returns 0 on success, -ENOMEM on error | |
342 | */ | |
343 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
344 | gfp_t gfp) | |
345 | { | |
346 | struct smack_rule *nrp; | |
347 | struct smack_rule *orp; | |
348 | int rc = 0; | |
349 | ||
350 | INIT_LIST_HEAD(nhead); | |
351 | ||
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 | ||
378 | INIT_LIST_HEAD(nhead); | |
379 | ||
380 | list_for_each_entry(oklep, ohead, list) { | |
381 | nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp); | |
382 | if (nklep == NULL) { | |
383 | smk_destroy_label_list(nhead); | |
384 | return -ENOMEM; | |
385 | } | |
386 | nklep->smk_label = oklep->smk_label; | |
387 | list_add(&nklep->list, nhead); | |
388 | } | |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
5663884c LP |
393 | /** |
394 | * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_* | |
395 | * @mode - input mode in form of PTRACE_MODE_* | |
396 | * | |
397 | * Returns a converted MAY_* mode usable by smack rules | |
398 | */ | |
399 | static inline unsigned int smk_ptrace_mode(unsigned int mode) | |
400 | { | |
3dfb7d8c | 401 | if (mode & PTRACE_MODE_ATTACH) |
5663884c | 402 | return MAY_READWRITE; |
3dfb7d8c JH |
403 | if (mode & PTRACE_MODE_READ) |
404 | return MAY_READ; | |
5663884c LP |
405 | |
406 | return 0; | |
407 | } | |
408 | ||
409 | /** | |
410 | * smk_ptrace_rule_check - helper for ptrace access | |
411 | * @tracer: tracer process | |
21c7eae2 | 412 | * @tracee_known: label entry of the process that's about to be traced |
5663884c LP |
413 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
414 | * @func: name of the function that called us, used for audit | |
415 | * | |
416 | * Returns 0 on access granted, -error on error | |
417 | */ | |
21c7eae2 LP |
418 | static int smk_ptrace_rule_check(struct task_struct *tracer, |
419 | struct smack_known *tracee_known, | |
5663884c LP |
420 | unsigned int mode, const char *func) |
421 | { | |
422 | int rc; | |
423 | struct smk_audit_info ad, *saip = NULL; | |
424 | struct task_smack *tsp; | |
21c7eae2 | 425 | struct smack_known *tracer_known; |
5663884c LP |
426 | |
427 | if ((mode & PTRACE_MODE_NOAUDIT) == 0) { | |
428 | smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK); | |
429 | smk_ad_setfield_u_tsk(&ad, tracer); | |
430 | saip = &ad; | |
431 | } | |
432 | ||
6d1cff2a AR |
433 | rcu_read_lock(); |
434 | tsp = __task_cred(tracer)->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; | |
444 | else if (capable(CAP_SYS_PTRACE)) | |
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 | ||
695 | opts->mnt_opts = kcalloc(NUM_SMK_MNT_OPTS, sizeof(char *), GFP_ATOMIC); | |
696 | if (!opts->mnt_opts) | |
697 | goto out_err; | |
698 | ||
699 | opts->mnt_opts_flags = kcalloc(NUM_SMK_MNT_OPTS, sizeof(int), | |
700 | GFP_ATOMIC); | |
701 | if (!opts->mnt_opts_flags) { | |
702 | kfree(opts->mnt_opts); | |
703 | goto out_err; | |
704 | } | |
705 | ||
706 | if (fsdefault) { | |
707 | opts->mnt_opts[num_mnt_opts] = fsdefault; | |
708 | opts->mnt_opts_flags[num_mnt_opts++] = FSDEFAULT_MNT; | |
709 | } | |
710 | if (fsfloor) { | |
711 | opts->mnt_opts[num_mnt_opts] = fsfloor; | |
712 | opts->mnt_opts_flags[num_mnt_opts++] = FSFLOOR_MNT; | |
713 | } | |
714 | if (fshat) { | |
715 | opts->mnt_opts[num_mnt_opts] = fshat; | |
716 | opts->mnt_opts_flags[num_mnt_opts++] = FSHAT_MNT; | |
717 | } | |
718 | if (fsroot) { | |
719 | opts->mnt_opts[num_mnt_opts] = fsroot; | |
720 | opts->mnt_opts_flags[num_mnt_opts++] = FSROOT_MNT; | |
721 | } | |
722 | if (fstransmute) { | |
723 | opts->mnt_opts[num_mnt_opts] = fstransmute; | |
724 | opts->mnt_opts_flags[num_mnt_opts++] = FSTRANS_MNT; | |
725 | } | |
726 | ||
727 | opts->num_mnt_opts = num_mnt_opts; | |
728 | return 0; | |
729 | ||
730 | out_opt_err: | |
731 | rc = -EINVAL; | |
732 | pr_warn("Smack: duplicate mount options\n"); | |
733 | ||
734 | out_err: | |
735 | kfree(fsdefault); | |
736 | kfree(fsfloor); | |
737 | kfree(fshat); | |
738 | kfree(fsroot); | |
739 | kfree(fstransmute); | |
740 | return rc; | |
741 | } | |
742 | ||
743 | /** | |
744 | * smack_set_mnt_opts - set Smack specific mount options | |
e114e473 | 745 | * @sb: the file system superblock |
3bf2789c VT |
746 | * @opts: Smack mount options |
747 | * @kern_flags: mount option from kernel space or user space | |
748 | * @set_kern_flags: where to store converted mount opts | |
e114e473 CS |
749 | * |
750 | * Returns 0 on success, an error code on failure | |
3bf2789c VT |
751 | * |
752 | * Allow filesystems with binary mount data to explicitly set Smack mount | |
753 | * labels. | |
e114e473 | 754 | */ |
3bf2789c VT |
755 | static int smack_set_mnt_opts(struct super_block *sb, |
756 | struct security_mnt_opts *opts, | |
757 | unsigned long kern_flags, | |
758 | unsigned long *set_kern_flags) | |
e114e473 CS |
759 | { |
760 | struct dentry *root = sb->s_root; | |
c6f493d6 | 761 | struct inode *inode = d_backing_inode(root); |
e114e473 CS |
762 | struct superblock_smack *sp = sb->s_security; |
763 | struct inode_smack *isp; | |
24ea1b6e | 764 | struct smack_known *skp; |
3bf2789c VT |
765 | int i; |
766 | int num_opts = opts->num_mnt_opts; | |
e830b394 | 767 | int transmute = 0; |
e114e473 | 768 | |
9f50eda2 | 769 | if (sp->smk_flags & SMK_SB_INITIALIZED) |
e114e473 | 770 | return 0; |
eb982cb4 | 771 | |
9f50eda2 | 772 | sp->smk_flags |= SMK_SB_INITIALIZED; |
e114e473 | 773 | |
3bf2789c VT |
774 | for (i = 0; i < num_opts; i++) { |
775 | switch (opts->mnt_opts_flags[i]) { | |
776 | case FSDEFAULT_MNT: | |
777 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
778 | if (IS_ERR(skp)) |
779 | return PTR_ERR(skp); | |
3bf2789c VT |
780 | sp->smk_default = skp; |
781 | break; | |
782 | case FSFLOOR_MNT: | |
783 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
784 | if (IS_ERR(skp)) |
785 | return PTR_ERR(skp); | |
786 | sp->smk_floor = skp; | |
3bf2789c VT |
787 | break; |
788 | case FSHAT_MNT: | |
789 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
790 | if (IS_ERR(skp)) |
791 | return PTR_ERR(skp); | |
3bf2789c VT |
792 | sp->smk_hat = skp; |
793 | break; | |
794 | case FSROOT_MNT: | |
795 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
796 | if (IS_ERR(skp)) |
797 | return PTR_ERR(skp); | |
798 | sp->smk_root = skp; | |
3bf2789c VT |
799 | break; |
800 | case FSTRANS_MNT: | |
801 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
802 | if (IS_ERR(skp)) |
803 | return PTR_ERR(skp); | |
804 | sp->smk_root = skp; | |
805 | transmute = 1; | |
3bf2789c VT |
806 | break; |
807 | default: | |
808 | break; | |
e114e473 CS |
809 | } |
810 | } | |
811 | ||
24ea1b6e CS |
812 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
813 | /* | |
814 | * Unprivileged mounts don't get to specify Smack values. | |
815 | */ | |
3bf2789c | 816 | if (num_opts) |
24ea1b6e CS |
817 | return -EPERM; |
818 | /* | |
819 | * Unprivileged mounts get root and default from the caller. | |
820 | */ | |
821 | skp = smk_of_current(); | |
21c7eae2 LP |
822 | sp->smk_root = skp; |
823 | sp->smk_default = skp; | |
9f50eda2 SF |
824 | /* |
825 | * For a handful of fs types with no user-controlled | |
826 | * backing store it's okay to trust security labels | |
827 | * in the filesystem. The rest are untrusted. | |
828 | */ | |
829 | if (sb->s_user_ns != &init_user_ns && | |
830 | sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC && | |
831 | sb->s_magic != RAMFS_MAGIC) { | |
832 | transmute = 1; | |
833 | sp->smk_flags |= SMK_SB_UNTRUSTED; | |
834 | } | |
24ea1b6e | 835 | } |
3bf2789c | 836 | |
e114e473 CS |
837 | /* |
838 | * Initialize the root inode. | |
839 | */ | |
840 | isp = inode->i_security; | |
55dfc5da JB |
841 | if (isp == NULL) { |
842 | isp = new_inode_smack(sp->smk_root); | |
843 | if (isp == NULL) | |
844 | return -ENOMEM; | |
845 | inode->i_security = isp; | |
e830b394 | 846 | } else |
e114e473 CS |
847 | isp->smk_inode = sp->smk_root; |
848 | ||
e830b394 CS |
849 | if (transmute) |
850 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
851 | ||
e114e473 CS |
852 | return 0; |
853 | } | |
854 | ||
3bf2789c VT |
855 | /** |
856 | * smack_sb_kern_mount - Smack specific mount processing | |
857 | * @sb: the file system superblock | |
858 | * @flags: the mount flags | |
859 | * @data: the smack mount options | |
860 | * | |
861 | * Returns 0 on success, an error code on failure | |
862 | */ | |
863 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) | |
864 | { | |
865 | int rc = 0; | |
866 | char *options = data; | |
867 | struct security_mnt_opts opts; | |
868 | ||
869 | security_init_mnt_opts(&opts); | |
870 | ||
871 | if (!options) | |
872 | goto out; | |
873 | ||
874 | rc = smack_parse_opts_str(options, &opts); | |
875 | if (rc) | |
876 | goto out_err; | |
877 | ||
878 | out: | |
879 | rc = smack_set_mnt_opts(sb, &opts, 0, NULL); | |
880 | ||
881 | out_err: | |
882 | security_free_mnt_opts(&opts); | |
883 | return rc; | |
884 | } | |
885 | ||
e114e473 CS |
886 | /** |
887 | * smack_sb_statfs - Smack check on statfs | |
888 | * @dentry: identifies the file system in question | |
889 | * | |
890 | * Returns 0 if current can read the floor of the filesystem, | |
891 | * and error code otherwise | |
892 | */ | |
893 | static int smack_sb_statfs(struct dentry *dentry) | |
894 | { | |
895 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
896 | int rc; |
897 | struct smk_audit_info ad; | |
898 | ||
a269434d | 899 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 900 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 901 | |
ecfcc53f | 902 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
d166c802 | 903 | rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc); |
ecfcc53f | 904 | return rc; |
e114e473 CS |
905 | } |
906 | ||
676dac4b CS |
907 | /* |
908 | * BPRM hooks | |
909 | */ | |
910 | ||
ce8a4321 CS |
911 | /** |
912 | * smack_bprm_set_creds - set creds for exec | |
913 | * @bprm: the exec information | |
914 | * | |
5663884c | 915 | * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise |
ce8a4321 | 916 | */ |
676dac4b CS |
917 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
918 | { | |
496ad9aa | 919 | struct inode *inode = file_inode(bprm->file); |
84088ba2 | 920 | struct task_smack *bsp = bprm->cred->security; |
676dac4b | 921 | struct inode_smack *isp; |
676dac4b CS |
922 | int rc; |
923 | ||
676dac4b CS |
924 | if (bprm->cred_prepared) |
925 | return 0; | |
926 | ||
84088ba2 JS |
927 | isp = inode->i_security; |
928 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
929 | return 0; |
930 | ||
5663884c LP |
931 | if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { |
932 | struct task_struct *tracer; | |
933 | rc = 0; | |
934 | ||
935 | rcu_read_lock(); | |
936 | tracer = ptrace_parent(current); | |
937 | if (likely(tracer != NULL)) | |
938 | rc = smk_ptrace_rule_check(tracer, | |
21c7eae2 | 939 | isp->smk_task, |
5663884c LP |
940 | PTRACE_MODE_ATTACH, |
941 | __func__); | |
942 | rcu_read_unlock(); | |
943 | ||
944 | if (rc != 0) | |
945 | return rc; | |
946 | } else if (bprm->unsafe) | |
84088ba2 | 947 | return -EPERM; |
676dac4b | 948 | |
84088ba2 JS |
949 | bsp->smk_task = isp->smk_task; |
950 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 951 | |
84088ba2 JS |
952 | return 0; |
953 | } | |
676dac4b | 954 | |
84088ba2 JS |
955 | /** |
956 | * smack_bprm_committing_creds - Prepare to install the new credentials | |
957 | * from bprm. | |
958 | * | |
959 | * @bprm: binprm for exec | |
960 | */ | |
961 | static void smack_bprm_committing_creds(struct linux_binprm *bprm) | |
962 | { | |
963 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 964 | |
84088ba2 JS |
965 | if (bsp->smk_task != bsp->smk_forked) |
966 | current->pdeath_signal = 0; | |
967 | } | |
968 | ||
969 | /** | |
970 | * smack_bprm_secureexec - Return the decision to use secureexec. | |
971 | * @bprm: binprm for exec | |
972 | * | |
973 | * Returns 0 on success. | |
974 | */ | |
975 | static int smack_bprm_secureexec(struct linux_binprm *bprm) | |
976 | { | |
977 | struct task_smack *tsp = current_security(); | |
84088ba2 | 978 | |
b1d9e6b0 CS |
979 | if (tsp->smk_task != tsp->smk_forked) |
980 | return 1; | |
84088ba2 | 981 | |
b1d9e6b0 | 982 | return 0; |
676dac4b CS |
983 | } |
984 | ||
e114e473 CS |
985 | /* |
986 | * Inode hooks | |
987 | */ | |
988 | ||
989 | /** | |
990 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 991 | * @inode: the inode in need of a blob |
e114e473 CS |
992 | * |
993 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
994 | */ | |
995 | static int smack_inode_alloc_security(struct inode *inode) | |
996 | { | |
2f823ff8 CS |
997 | struct smack_known *skp = smk_of_current(); |
998 | ||
21c7eae2 | 999 | inode->i_security = new_inode_smack(skp); |
e114e473 CS |
1000 | if (inode->i_security == NULL) |
1001 | return -ENOMEM; | |
1002 | return 0; | |
1003 | } | |
1004 | ||
1005 | /** | |
1006 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 1007 | * @inode: the inode with a blob |
e114e473 CS |
1008 | * |
1009 | * Clears the blob pointer in inode | |
1010 | */ | |
1011 | static void smack_inode_free_security(struct inode *inode) | |
1012 | { | |
1a5b472b | 1013 | kmem_cache_free(smack_inode_cache, inode->i_security); |
e114e473 CS |
1014 | inode->i_security = NULL; |
1015 | } | |
1016 | ||
1017 | /** | |
1018 | * smack_inode_init_security - copy out the smack from an inode | |
e95ef49b LP |
1019 | * @inode: the newly created inode |
1020 | * @dir: containing directory object | |
2a7dba39 | 1021 | * @qstr: unused |
e114e473 CS |
1022 | * @name: where to put the attribute name |
1023 | * @value: where to put the attribute value | |
1024 | * @len: where to put the length of the attribute | |
1025 | * | |
1026 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
1027 | */ | |
1028 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
9548906b | 1029 | const struct qstr *qstr, const char **name, |
2a7dba39 | 1030 | void **value, size_t *len) |
e114e473 | 1031 | { |
2267b13a | 1032 | struct inode_smack *issp = inode->i_security; |
2f823ff8 | 1033 | struct smack_known *skp = smk_of_current(); |
21c7eae2 LP |
1034 | struct smack_known *isp = smk_of_inode(inode); |
1035 | struct smack_known *dsp = smk_of_inode(dir); | |
7898e1f8 | 1036 | int may; |
e114e473 | 1037 | |
9548906b TH |
1038 | if (name) |
1039 | *name = XATTR_SMACK_SUFFIX; | |
e114e473 | 1040 | |
68390ccf | 1041 | if (value && len) { |
7898e1f8 | 1042 | rcu_read_lock(); |
21c7eae2 LP |
1043 | may = smk_access_entry(skp->smk_known, dsp->smk_known, |
1044 | &skp->smk_rules); | |
7898e1f8 | 1045 | rcu_read_unlock(); |
5c6d1125 JS |
1046 | |
1047 | /* | |
1048 | * If the access rule allows transmutation and | |
1049 | * the directory requests transmutation then | |
1050 | * by all means transmute. | |
2267b13a | 1051 | * Mark the inode as changed. |
5c6d1125 | 1052 | */ |
7898e1f8 | 1053 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
2267b13a | 1054 | smk_inode_transmutable(dir)) { |
5c6d1125 | 1055 | isp = dsp; |
2267b13a CS |
1056 | issp->smk_flags |= SMK_INODE_CHANGED; |
1057 | } | |
5c6d1125 | 1058 | |
21c7eae2 | 1059 | *value = kstrdup(isp->smk_known, GFP_NOFS); |
e114e473 CS |
1060 | if (*value == NULL) |
1061 | return -ENOMEM; | |
e114e473 | 1062 | |
21c7eae2 | 1063 | *len = strlen(isp->smk_known); |
68390ccf | 1064 | } |
e114e473 CS |
1065 | |
1066 | return 0; | |
1067 | } | |
1068 | ||
1069 | /** | |
1070 | * smack_inode_link - Smack check on link | |
1071 | * @old_dentry: the existing object | |
1072 | * @dir: unused | |
1073 | * @new_dentry: the new object | |
1074 | * | |
1075 | * Returns 0 if access is permitted, an error code otherwise | |
1076 | */ | |
1077 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
1078 | struct dentry *new_dentry) | |
1079 | { | |
21c7eae2 | 1080 | struct smack_known *isp; |
ecfcc53f EB |
1081 | struct smk_audit_info ad; |
1082 | int rc; | |
1083 | ||
a269434d | 1084 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1085 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1086 | |
c6f493d6 | 1087 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1088 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
c6f493d6 | 1089 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc); |
e114e473 | 1090 | |
8802565b | 1091 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1092 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1093 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1094 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
c6f493d6 | 1095 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc); |
e114e473 CS |
1096 | } |
1097 | ||
1098 | return rc; | |
1099 | } | |
1100 | ||
1101 | /** | |
1102 | * smack_inode_unlink - Smack check on inode deletion | |
1103 | * @dir: containing directory object | |
1104 | * @dentry: file to unlink | |
1105 | * | |
1106 | * Returns 0 if current can write the containing directory | |
1107 | * and the object, error code otherwise | |
1108 | */ | |
1109 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
1110 | { | |
c6f493d6 | 1111 | struct inode *ip = d_backing_inode(dentry); |
ecfcc53f | 1112 | struct smk_audit_info ad; |
e114e473 CS |
1113 | int rc; |
1114 | ||
a269434d | 1115 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1116 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1117 | ||
e114e473 CS |
1118 | /* |
1119 | * You need write access to the thing you're unlinking | |
1120 | */ | |
ecfcc53f | 1121 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
d166c802 | 1122 | rc = smk_bu_inode(ip, MAY_WRITE, rc); |
ecfcc53f | 1123 | if (rc == 0) { |
e114e473 CS |
1124 | /* |
1125 | * You also need write access to the containing directory | |
1126 | */ | |
cdb56b60 | 1127 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1128 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1129 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1130 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1131 | } |
e114e473 CS |
1132 | return rc; |
1133 | } | |
1134 | ||
1135 | /** | |
1136 | * smack_inode_rmdir - Smack check on directory deletion | |
1137 | * @dir: containing directory object | |
1138 | * @dentry: directory to unlink | |
1139 | * | |
1140 | * Returns 0 if current can write the containing directory | |
1141 | * and the directory, error code otherwise | |
1142 | */ | |
1143 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
1144 | { | |
ecfcc53f | 1145 | struct smk_audit_info ad; |
e114e473 CS |
1146 | int rc; |
1147 | ||
a269434d | 1148 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1149 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1150 | ||
e114e473 CS |
1151 | /* |
1152 | * You need write access to the thing you're removing | |
1153 | */ | |
c6f493d6 DH |
1154 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1155 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
ecfcc53f | 1156 | if (rc == 0) { |
e114e473 CS |
1157 | /* |
1158 | * You also need write access to the containing directory | |
1159 | */ | |
cdb56b60 | 1160 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1161 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1162 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1163 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1164 | } |
e114e473 CS |
1165 | |
1166 | return rc; | |
1167 | } | |
1168 | ||
1169 | /** | |
1170 | * smack_inode_rename - Smack check on rename | |
e95ef49b LP |
1171 | * @old_inode: unused |
1172 | * @old_dentry: the old object | |
1173 | * @new_inode: unused | |
1174 | * @new_dentry: the new object | |
e114e473 CS |
1175 | * |
1176 | * Read and write access is required on both the old and | |
1177 | * new directories. | |
1178 | * | |
1179 | * Returns 0 if access is permitted, an error code otherwise | |
1180 | */ | |
1181 | static int smack_inode_rename(struct inode *old_inode, | |
1182 | struct dentry *old_dentry, | |
1183 | struct inode *new_inode, | |
1184 | struct dentry *new_dentry) | |
1185 | { | |
1186 | int rc; | |
21c7eae2 | 1187 | struct smack_known *isp; |
ecfcc53f EB |
1188 | struct smk_audit_info ad; |
1189 | ||
a269434d | 1190 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1191 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1192 | |
c6f493d6 | 1193 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1194 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
c6f493d6 | 1195 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc); |
e114e473 | 1196 | |
8802565b | 1197 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1198 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1199 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1200 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
c6f493d6 | 1201 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc); |
e114e473 | 1202 | } |
e114e473 CS |
1203 | return rc; |
1204 | } | |
1205 | ||
1206 | /** | |
1207 | * smack_inode_permission - Smack version of permission() | |
1208 | * @inode: the inode in question | |
1209 | * @mask: the access requested | |
e114e473 CS |
1210 | * |
1211 | * This is the important Smack hook. | |
1212 | * | |
1213 | * Returns 0 if access is permitted, -EACCES otherwise | |
1214 | */ | |
e74f71eb | 1215 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 1216 | { |
9f50eda2 | 1217 | struct superblock_smack *sbsp = inode->i_sb->s_security; |
ecfcc53f | 1218 | struct smk_audit_info ad; |
e74f71eb | 1219 | int no_block = mask & MAY_NOT_BLOCK; |
d166c802 | 1220 | int rc; |
d09ca739 EP |
1221 | |
1222 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
1223 | /* |
1224 | * No permission to check. Existence test. Yup, it's there. | |
1225 | */ | |
1226 | if (mask == 0) | |
1227 | return 0; | |
8c9e80ed | 1228 | |
9f50eda2 SF |
1229 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED) { |
1230 | if (smk_of_inode(inode) != sbsp->smk_root) | |
1231 | return -EACCES; | |
1232 | } | |
1233 | ||
8c9e80ed | 1234 | /* May be droppable after audit */ |
e74f71eb | 1235 | if (no_block) |
8c9e80ed | 1236 | return -ECHILD; |
f48b7399 | 1237 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f | 1238 | smk_ad_setfield_u_fs_inode(&ad, inode); |
d166c802 CS |
1239 | rc = smk_curacc(smk_of_inode(inode), mask, &ad); |
1240 | rc = smk_bu_inode(inode, mask, rc); | |
1241 | return rc; | |
e114e473 CS |
1242 | } |
1243 | ||
1244 | /** | |
1245 | * smack_inode_setattr - Smack check for setting attributes | |
1246 | * @dentry: the object | |
1247 | * @iattr: for the force flag | |
1248 | * | |
1249 | * Returns 0 if access is permitted, an error code otherwise | |
1250 | */ | |
1251 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
1252 | { | |
ecfcc53f | 1253 | struct smk_audit_info ad; |
d166c802 CS |
1254 | int rc; |
1255 | ||
e114e473 CS |
1256 | /* |
1257 | * Need to allow for clearing the setuid bit. | |
1258 | */ | |
1259 | if (iattr->ia_valid & ATTR_FORCE) | |
1260 | return 0; | |
a269434d | 1261 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1262 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 1263 | |
c6f493d6 DH |
1264 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1265 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1266 | return rc; |
e114e473 CS |
1267 | } |
1268 | ||
1269 | /** | |
1270 | * smack_inode_getattr - Smack check for getting attributes | |
e95ef49b | 1271 | * @mnt: vfsmount of the object |
e114e473 CS |
1272 | * @dentry: the object |
1273 | * | |
1274 | * Returns 0 if access is permitted, an error code otherwise | |
1275 | */ | |
3f7036a0 | 1276 | static int smack_inode_getattr(const struct path *path) |
e114e473 | 1277 | { |
ecfcc53f | 1278 | struct smk_audit_info ad; |
c6f493d6 | 1279 | struct inode *inode = d_backing_inode(path->dentry); |
d166c802 | 1280 | int rc; |
ecfcc53f | 1281 | |
f48b7399 | 1282 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
3f7036a0 AV |
1283 | smk_ad_setfield_u_fs_path(&ad, *path); |
1284 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); | |
1285 | rc = smk_bu_inode(inode, MAY_READ, rc); | |
d166c802 | 1286 | return rc; |
e114e473 CS |
1287 | } |
1288 | ||
1289 | /** | |
1290 | * smack_inode_setxattr - Smack check for setting xattrs | |
1291 | * @dentry: the object | |
1292 | * @name: name of the attribute | |
e95ef49b LP |
1293 | * @value: value of the attribute |
1294 | * @size: size of the value | |
e114e473 CS |
1295 | * @flags: unused |
1296 | * | |
1297 | * This protects the Smack attribute explicitly. | |
1298 | * | |
1299 | * Returns 0 if access is permitted, an error code otherwise | |
1300 | */ | |
8f0cfa52 DH |
1301 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
1302 | const void *value, size_t size, int flags) | |
e114e473 | 1303 | { |
ecfcc53f | 1304 | struct smk_audit_info ad; |
19760ad0 CS |
1305 | struct smack_known *skp; |
1306 | int check_priv = 0; | |
1307 | int check_import = 0; | |
1308 | int check_star = 0; | |
bcdca225 | 1309 | int rc = 0; |
e114e473 | 1310 | |
19760ad0 CS |
1311 | /* |
1312 | * Check label validity here so import won't fail in post_setxattr | |
1313 | */ | |
bcdca225 CS |
1314 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1315 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
1316 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
1317 | check_priv = 1; | |
1318 | check_import = 1; | |
1319 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
1320 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
1321 | check_priv = 1; | |
1322 | check_import = 1; | |
1323 | check_star = 1; | |
5c6d1125 | 1324 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 1325 | check_priv = 1; |
5c6d1125 JS |
1326 | if (size != TRANS_TRUE_SIZE || |
1327 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
1328 | rc = -EINVAL; | |
bcdca225 CS |
1329 | } else |
1330 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
1331 | ||
19760ad0 CS |
1332 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
1333 | rc = -EPERM; | |
1334 | ||
1335 | if (rc == 0 && check_import) { | |
b862e561 | 1336 | skp = size ? smk_import_entry(value, size) : NULL; |
e774ad68 LP |
1337 | if (IS_ERR(skp)) |
1338 | rc = PTR_ERR(skp); | |
1339 | else if (skp == NULL || (check_star && | |
19760ad0 CS |
1340 | (skp == &smack_known_star || skp == &smack_known_web))) |
1341 | rc = -EINVAL; | |
1342 | } | |
1343 | ||
a269434d | 1344 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1345 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1346 | ||
d166c802 | 1347 | if (rc == 0) { |
c6f493d6 DH |
1348 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1349 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1350 | } |
bcdca225 CS |
1351 | |
1352 | return rc; | |
e114e473 CS |
1353 | } |
1354 | ||
1355 | /** | |
1356 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
1357 | * @dentry: object | |
1358 | * @name: attribute name | |
1359 | * @value: attribute value | |
1360 | * @size: attribute size | |
1361 | * @flags: unused | |
1362 | * | |
1363 | * Set the pointer in the inode blob to the entry found | |
1364 | * in the master label list. | |
1365 | */ | |
8f0cfa52 DH |
1366 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
1367 | const void *value, size_t size, int flags) | |
e114e473 | 1368 | { |
2f823ff8 | 1369 | struct smack_known *skp; |
c6f493d6 | 1370 | struct inode_smack *isp = d_backing_inode(dentry)->i_security; |
676dac4b | 1371 | |
2f823ff8 CS |
1372 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
1373 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
1374 | return; | |
1375 | } | |
1376 | ||
676dac4b | 1377 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
9598f4c9 | 1378 | skp = smk_import_entry(value, size); |
e774ad68 | 1379 | if (!IS_ERR(skp)) |
21c7eae2 | 1380 | isp->smk_inode = skp; |
676dac4b | 1381 | else |
21c7eae2 | 1382 | isp->smk_inode = &smack_known_invalid; |
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; |
676dac4b | 1387 | else |
2f823ff8 | 1388 | isp->smk_task = &smack_known_invalid; |
7898e1f8 | 1389 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
9598f4c9 | 1390 | skp = smk_import_entry(value, size); |
e774ad68 | 1391 | if (!IS_ERR(skp)) |
2f823ff8 | 1392 | isp->smk_mmap = skp; |
7898e1f8 | 1393 | else |
2f823ff8 CS |
1394 | isp->smk_mmap = &smack_known_invalid; |
1395 | } | |
e114e473 CS |
1396 | |
1397 | return; | |
1398 | } | |
1399 | ||
ce8a4321 | 1400 | /** |
e114e473 CS |
1401 | * smack_inode_getxattr - Smack check on getxattr |
1402 | * @dentry: the object | |
1403 | * @name: unused | |
1404 | * | |
1405 | * Returns 0 if access is permitted, an error code otherwise | |
1406 | */ | |
8f0cfa52 | 1407 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 1408 | { |
ecfcc53f | 1409 | struct smk_audit_info ad; |
d166c802 | 1410 | int rc; |
ecfcc53f | 1411 | |
a269434d | 1412 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1413 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1414 | ||
c6f493d6 DH |
1415 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad); |
1416 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc); | |
d166c802 | 1417 | return rc; |
e114e473 CS |
1418 | } |
1419 | ||
ce8a4321 | 1420 | /** |
e114e473 CS |
1421 | * smack_inode_removexattr - Smack check on removexattr |
1422 | * @dentry: the object | |
1423 | * @name: name of the attribute | |
1424 | * | |
1425 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
1426 | * | |
1427 | * Returns 0 if access is permitted, an error code otherwise | |
1428 | */ | |
8f0cfa52 | 1429 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 1430 | { |
676dac4b | 1431 | struct inode_smack *isp; |
ecfcc53f | 1432 | struct smk_audit_info ad; |
bcdca225 | 1433 | int rc = 0; |
e114e473 | 1434 | |
bcdca225 CS |
1435 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1436 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 1437 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 1438 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 | 1439 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
5e9ab593 | 1440 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
1880eff7 | 1441 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
1442 | rc = -EPERM; |
1443 | } else | |
1444 | rc = cap_inode_removexattr(dentry, name); | |
1445 | ||
f59bdfba CS |
1446 | if (rc != 0) |
1447 | return rc; | |
1448 | ||
a269434d | 1449 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1450 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 1451 | |
c6f493d6 DH |
1452 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1453 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
f59bdfba CS |
1454 | if (rc != 0) |
1455 | return rc; | |
1456 | ||
c6f493d6 | 1457 | isp = d_backing_inode(dentry)->i_security; |
f59bdfba CS |
1458 | /* |
1459 | * Don't do anything special for these. | |
1460 | * XATTR_NAME_SMACKIPIN | |
1461 | * XATTR_NAME_SMACKIPOUT | |
f59bdfba | 1462 | */ |
8012495e | 1463 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
fc64005c | 1464 | struct super_block *sbp = dentry->d_sb; |
8012495e JB |
1465 | struct superblock_smack *sbsp = sbp->s_security; |
1466 | ||
1467 | isp->smk_inode = sbsp->smk_default; | |
1468 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) | |
676dac4b | 1469 | isp->smk_task = NULL; |
f59bdfba | 1470 | else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) |
7898e1f8 | 1471 | isp->smk_mmap = NULL; |
f59bdfba CS |
1472 | else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
1473 | isp->smk_flags &= ~SMK_INODE_TRANSMUTE; | |
676dac4b | 1474 | |
f59bdfba | 1475 | return 0; |
e114e473 CS |
1476 | } |
1477 | ||
1478 | /** | |
1479 | * smack_inode_getsecurity - get smack xattrs | |
1480 | * @inode: the object | |
1481 | * @name: attribute name | |
1482 | * @buffer: where to put the result | |
251a2a95 | 1483 | * @alloc: unused |
e114e473 CS |
1484 | * |
1485 | * Returns the size of the attribute or an error code | |
1486 | */ | |
ea861dfd | 1487 | static int smack_inode_getsecurity(struct inode *inode, |
e114e473 CS |
1488 | const char *name, void **buffer, |
1489 | bool alloc) | |
1490 | { | |
1491 | struct socket_smack *ssp; | |
1492 | struct socket *sock; | |
1493 | struct super_block *sbp; | |
1494 | struct inode *ip = (struct inode *)inode; | |
21c7eae2 | 1495 | struct smack_known *isp; |
e114e473 CS |
1496 | int ilen; |
1497 | int rc = 0; | |
1498 | ||
1499 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1500 | isp = smk_of_inode(inode); | |
21c7eae2 LP |
1501 | ilen = strlen(isp->smk_known); |
1502 | *buffer = isp->smk_known; | |
e114e473 CS |
1503 | return ilen; |
1504 | } | |
1505 | ||
1506 | /* | |
1507 | * The rest of the Smack xattrs are only on sockets. | |
1508 | */ | |
1509 | sbp = ip->i_sb; | |
1510 | if (sbp->s_magic != SOCKFS_MAGIC) | |
1511 | return -EOPNOTSUPP; | |
1512 | ||
1513 | sock = SOCKET_I(ip); | |
2e1d146a | 1514 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1515 | return -EOPNOTSUPP; |
1516 | ||
1517 | ssp = sock->sk->sk_security; | |
1518 | ||
1519 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
21c7eae2 | 1520 | isp = ssp->smk_in; |
e114e473 | 1521 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) |
21c7eae2 | 1522 | isp = ssp->smk_out; |
e114e473 CS |
1523 | else |
1524 | return -EOPNOTSUPP; | |
1525 | ||
21c7eae2 | 1526 | ilen = strlen(isp->smk_known); |
e114e473 | 1527 | if (rc == 0) { |
21c7eae2 | 1528 | *buffer = isp->smk_known; |
e114e473 CS |
1529 | rc = ilen; |
1530 | } | |
1531 | ||
1532 | return rc; | |
1533 | } | |
1534 | ||
1535 | ||
1536 | /** | |
1537 | * smack_inode_listsecurity - list the Smack attributes | |
1538 | * @inode: the object | |
1539 | * @buffer: where they go | |
1540 | * @buffer_size: size of buffer | |
e114e473 CS |
1541 | */ |
1542 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1543 | size_t buffer_size) | |
1544 | { | |
fd5c9d23 | 1545 | int len = sizeof(XATTR_NAME_SMACK); |
e114e473 | 1546 | |
fd5c9d23 | 1547 | if (buffer != NULL && len <= buffer_size) |
e114e473 | 1548 | memcpy(buffer, XATTR_NAME_SMACK, len); |
fd5c9d23 KK |
1549 | |
1550 | return len; | |
e114e473 CS |
1551 | } |
1552 | ||
d20bdda6 AD |
1553 | /** |
1554 | * smack_inode_getsecid - Extract inode's security id | |
1555 | * @inode: inode to extract the info from | |
1556 | * @secid: where result will be saved | |
1557 | */ | |
d6335d77 | 1558 | static void smack_inode_getsecid(struct inode *inode, u32 *secid) |
d20bdda6 AD |
1559 | { |
1560 | struct inode_smack *isp = inode->i_security; | |
1561 | ||
21c7eae2 | 1562 | *secid = isp->smk_inode->smk_secid; |
d20bdda6 AD |
1563 | } |
1564 | ||
e114e473 CS |
1565 | /* |
1566 | * File Hooks | |
1567 | */ | |
1568 | ||
491a0b08 CS |
1569 | /* |
1570 | * There is no smack_file_permission hook | |
e114e473 CS |
1571 | * |
1572 | * Should access checks be done on each read or write? | |
1573 | * UNICOS and SELinux say yes. | |
1574 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1575 | * | |
1576 | * I'll say no for now. Smack does not do the frequent | |
1577 | * label changing that SELinux does. | |
1578 | */ | |
e114e473 CS |
1579 | |
1580 | /** | |
1581 | * smack_file_alloc_security - assign a file security blob | |
1582 | * @file: the object | |
1583 | * | |
1584 | * The security blob for a file is a pointer to the master | |
1585 | * label list, so no allocation is done. | |
1586 | * | |
5e7270a6 CS |
1587 | * f_security is the owner security information. It |
1588 | * isn't used on file access checks, it's for send_sigio. | |
1589 | * | |
e114e473 CS |
1590 | * Returns 0 |
1591 | */ | |
1592 | static int smack_file_alloc_security(struct file *file) | |
1593 | { | |
2f823ff8 CS |
1594 | struct smack_known *skp = smk_of_current(); |
1595 | ||
21c7eae2 | 1596 | file->f_security = skp; |
e114e473 CS |
1597 | return 0; |
1598 | } | |
1599 | ||
1600 | /** | |
1601 | * smack_file_free_security - clear a file security blob | |
1602 | * @file: the object | |
1603 | * | |
1604 | * The security blob for a file is a pointer to the master | |
1605 | * label list, so no memory is freed. | |
1606 | */ | |
1607 | static void smack_file_free_security(struct file *file) | |
1608 | { | |
1609 | file->f_security = NULL; | |
1610 | } | |
1611 | ||
1612 | /** | |
1613 | * smack_file_ioctl - Smack check on ioctls | |
1614 | * @file: the object | |
1615 | * @cmd: what to do | |
1616 | * @arg: unused | |
1617 | * | |
1618 | * Relies heavily on the correct use of the ioctl command conventions. | |
1619 | * | |
1620 | * Returns 0 if allowed, error code otherwise | |
1621 | */ | |
1622 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1623 | unsigned long arg) | |
1624 | { | |
1625 | int rc = 0; | |
ecfcc53f | 1626 | struct smk_audit_info ad; |
5e7270a6 | 1627 | struct inode *inode = file_inode(file); |
ecfcc53f | 1628 | |
f48b7399 | 1629 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1630 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 | 1631 | |
d166c802 | 1632 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
5e7270a6 | 1633 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 CS |
1634 | rc = smk_bu_file(file, MAY_WRITE, rc); |
1635 | } | |
e114e473 | 1636 | |
d166c802 | 1637 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) { |
5e7270a6 | 1638 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); |
d166c802 CS |
1639 | rc = smk_bu_file(file, MAY_READ, rc); |
1640 | } | |
e114e473 CS |
1641 | |
1642 | return rc; | |
1643 | } | |
1644 | ||
1645 | /** | |
1646 | * smack_file_lock - Smack check on file locking | |
1647 | * @file: the object | |
251a2a95 | 1648 | * @cmd: unused |
e114e473 | 1649 | * |
c0ab6e56 | 1650 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1651 | */ |
1652 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1653 | { | |
ecfcc53f | 1654 | struct smk_audit_info ad; |
d166c802 | 1655 | int rc; |
5e7270a6 | 1656 | struct inode *inode = file_inode(file); |
ecfcc53f | 1657 | |
92f42509 EP |
1658 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1659 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1660 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 CS |
1661 | rc = smk_bu_file(file, MAY_LOCK, rc); |
1662 | return rc; | |
e114e473 CS |
1663 | } |
1664 | ||
1665 | /** | |
1666 | * smack_file_fcntl - Smack check on fcntl | |
1667 | * @file: the object | |
1668 | * @cmd: what action to check | |
1669 | * @arg: unused | |
1670 | * | |
531f1d45 CS |
1671 | * Generally these operations are harmless. |
1672 | * File locking operations present an obvious mechanism | |
1673 | * for passing information, so they require write access. | |
1674 | * | |
e114e473 CS |
1675 | * Returns 0 if current has access, error code otherwise |
1676 | */ | |
1677 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1678 | unsigned long arg) | |
1679 | { | |
ecfcc53f | 1680 | struct smk_audit_info ad; |
531f1d45 | 1681 | int rc = 0; |
5e7270a6 | 1682 | struct inode *inode = file_inode(file); |
ecfcc53f | 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; |
0e0a070d CS |
1728 | int may; |
1729 | int mmay; | |
1730 | int tmay; | |
7898e1f8 CS |
1731 | int rc; |
1732 | ||
496ad9aa | 1733 | if (file == NULL) |
7898e1f8 CS |
1734 | return 0; |
1735 | ||
496ad9aa | 1736 | isp = file_inode(file)->i_security; |
7898e1f8 CS |
1737 | if (isp->smk_mmap == NULL) |
1738 | return 0; | |
2f823ff8 | 1739 | mkp = isp->smk_mmap; |
7898e1f8 CS |
1740 | |
1741 | tsp = current_security(); | |
2f823ff8 | 1742 | skp = smk_of_current(); |
7898e1f8 CS |
1743 | rc = 0; |
1744 | ||
1745 | rcu_read_lock(); | |
1746 | /* | |
1747 | * For each Smack rule associated with the subject | |
1748 | * label verify that the SMACK64MMAP also has access | |
1749 | * to that rule's object label. | |
7898e1f8 | 1750 | */ |
272cd7a8 | 1751 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
21c7eae2 | 1752 | okp = srp->smk_object; |
7898e1f8 CS |
1753 | /* |
1754 | * Matching labels always allows access. | |
1755 | */ | |
21c7eae2 | 1756 | if (mkp->smk_known == okp->smk_known) |
7898e1f8 | 1757 | continue; |
0e0a070d CS |
1758 | /* |
1759 | * If there is a matching local rule take | |
1760 | * that into account as well. | |
1761 | */ | |
21c7eae2 LP |
1762 | may = smk_access_entry(srp->smk_subject->smk_known, |
1763 | okp->smk_known, | |
1764 | &tsp->smk_rules); | |
0e0a070d CS |
1765 | if (may == -ENOENT) |
1766 | may = srp->smk_access; | |
1767 | else | |
1768 | may &= srp->smk_access; | |
1769 | /* | |
1770 | * If may is zero the SMACK64MMAP subject can't | |
1771 | * possibly have less access. | |
1772 | */ | |
1773 | if (may == 0) | |
1774 | continue; | |
1775 | ||
1776 | /* | |
1777 | * Fetch the global list entry. | |
1778 | * If there isn't one a SMACK64MMAP subject | |
1779 | * can't have as much access as current. | |
1780 | */ | |
21c7eae2 LP |
1781 | mmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1782 | &mkp->smk_rules); | |
0e0a070d CS |
1783 | if (mmay == -ENOENT) { |
1784 | rc = -EACCES; | |
1785 | break; | |
1786 | } | |
1787 | /* | |
1788 | * If there is a local entry it modifies the | |
1789 | * potential access, too. | |
1790 | */ | |
21c7eae2 LP |
1791 | tmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1792 | &tsp->smk_rules); | |
0e0a070d CS |
1793 | if (tmay != -ENOENT) |
1794 | mmay &= tmay; | |
7898e1f8 | 1795 | |
0e0a070d CS |
1796 | /* |
1797 | * If there is any access available to current that is | |
1798 | * not available to a SMACK64MMAP subject | |
1799 | * deny access. | |
1800 | */ | |
75a25637 | 1801 | if ((may | mmay) != mmay) { |
0e0a070d | 1802 | rc = -EACCES; |
7898e1f8 | 1803 | break; |
0e0a070d | 1804 | } |
7898e1f8 CS |
1805 | } |
1806 | ||
1807 | rcu_read_unlock(); | |
1808 | ||
1809 | return rc; | |
1810 | } | |
1811 | ||
e114e473 CS |
1812 | /** |
1813 | * smack_file_set_fowner - set the file security blob value | |
1814 | * @file: object in question | |
1815 | * | |
e114e473 | 1816 | */ |
e0b93edd | 1817 | static void smack_file_set_fowner(struct file *file) |
e114e473 | 1818 | { |
5e7270a6 | 1819 | file->f_security = smk_of_current(); |
e114e473 CS |
1820 | } |
1821 | ||
1822 | /** | |
1823 | * smack_file_send_sigiotask - Smack on sigio | |
1824 | * @tsk: The target task | |
1825 | * @fown: the object the signal come from | |
1826 | * @signum: unused | |
1827 | * | |
1828 | * Allow a privileged task to get signals even if it shouldn't | |
1829 | * | |
1830 | * Returns 0 if a subject with the object's smack could | |
1831 | * write to the task, an error code otherwise. | |
1832 | */ | |
1833 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1834 | struct fown_struct *fown, int signum) | |
1835 | { | |
2f823ff8 CS |
1836 | struct smack_known *skp; |
1837 | struct smack_known *tkp = smk_of_task(tsk->cred->security); | |
e114e473 CS |
1838 | struct file *file; |
1839 | int rc; | |
ecfcc53f | 1840 | struct smk_audit_info ad; |
e114e473 CS |
1841 | |
1842 | /* | |
1843 | * struct fown_struct is never outside the context of a struct file | |
1844 | */ | |
1845 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1846 | |
ecfcc53f | 1847 | /* we don't log here as rc can be overriden */ |
21c7eae2 LP |
1848 | skp = file->f_security; |
1849 | rc = smk_access(skp, tkp, MAY_WRITE, NULL); | |
1850 | rc = smk_bu_note("sigiotask", skp, tkp, MAY_WRITE, rc); | |
5cd9c58f | 1851 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1852 | rc = 0; |
1853 | ||
1854 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1855 | smk_ad_setfield_u_tsk(&ad, tsk); | |
21c7eae2 | 1856 | smack_log(skp->smk_known, tkp->smk_known, MAY_WRITE, rc, &ad); |
e114e473 CS |
1857 | return rc; |
1858 | } | |
1859 | ||
1860 | /** | |
1861 | * smack_file_receive - Smack file receive check | |
1862 | * @file: the object | |
1863 | * | |
1864 | * Returns 0 if current has access, error code otherwise | |
1865 | */ | |
1866 | static int smack_file_receive(struct file *file) | |
1867 | { | |
d166c802 | 1868 | int rc; |
e114e473 | 1869 | int may = 0; |
ecfcc53f | 1870 | struct smk_audit_info ad; |
5e7270a6 | 1871 | struct inode *inode = file_inode(file); |
79be0935 CS |
1872 | struct socket *sock; |
1873 | struct task_smack *tsp; | |
1874 | struct socket_smack *ssp; | |
e114e473 | 1875 | |
9777582e SWK |
1876 | if (unlikely(IS_PRIVATE(inode))) |
1877 | return 0; | |
1878 | ||
4482a44f | 1879 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1880 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
79be0935 CS |
1881 | |
1882 | if (S_ISSOCK(inode->i_mode)) { | |
1883 | sock = SOCKET_I(inode); | |
1884 | ssp = sock->sk->sk_security; | |
1885 | tsp = current_security(); | |
1886 | /* | |
1887 | * If the receiving process can't write to the | |
1888 | * passed socket or if the passed socket can't | |
1889 | * write to the receiving process don't accept | |
1890 | * the passed socket. | |
1891 | */ | |
1892 | rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad); | |
1893 | rc = smk_bu_file(file, may, rc); | |
1894 | if (rc < 0) | |
1895 | return rc; | |
1896 | rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad); | |
1897 | rc = smk_bu_file(file, may, rc); | |
1898 | return rc; | |
1899 | } | |
e114e473 CS |
1900 | /* |
1901 | * This code relies on bitmasks. | |
1902 | */ | |
1903 | if (file->f_mode & FMODE_READ) | |
1904 | may = MAY_READ; | |
1905 | if (file->f_mode & FMODE_WRITE) | |
1906 | may |= MAY_WRITE; | |
1907 | ||
5e7270a6 | 1908 | rc = smk_curacc(smk_of_inode(inode), may, &ad); |
d166c802 CS |
1909 | rc = smk_bu_file(file, may, rc); |
1910 | return rc; | |
e114e473 CS |
1911 | } |
1912 | ||
531f1d45 | 1913 | /** |
83d49856 | 1914 | * smack_file_open - Smack dentry open processing |
531f1d45 | 1915 | * @file: the object |
a6834c0b | 1916 | * @cred: task credential |
531f1d45 CS |
1917 | * |
1918 | * Set the security blob in the file structure. | |
a6834c0b CS |
1919 | * Allow the open only if the task has read access. There are |
1920 | * many read operations (e.g. fstat) that you can do with an | |
1921 | * fd even if you have the file open write-only. | |
531f1d45 CS |
1922 | * |
1923 | * Returns 0 | |
1924 | */ | |
83d49856 | 1925 | static int smack_file_open(struct file *file, const struct cred *cred) |
531f1d45 | 1926 | { |
a6834c0b | 1927 | struct task_smack *tsp = cred->security; |
5e7270a6 | 1928 | struct inode *inode = file_inode(file); |
a6834c0b CS |
1929 | struct smk_audit_info ad; |
1930 | int rc; | |
531f1d45 | 1931 | |
5e7270a6 | 1932 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
a6834c0b | 1933 | return 0; |
531f1d45 | 1934 | |
a6834c0b CS |
1935 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1936 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1937 | rc = smk_access(tsp->smk_task, smk_of_inode(inode), MAY_READ, &ad); |
d166c802 | 1938 | rc = smk_bu_credfile(cred, file, MAY_READ, rc); |
a6834c0b CS |
1939 | |
1940 | return rc; | |
531f1d45 CS |
1941 | } |
1942 | ||
e114e473 CS |
1943 | /* |
1944 | * Task hooks | |
1945 | */ | |
1946 | ||
ee18d64c DH |
1947 | /** |
1948 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1949 | * @new: the new credentials | |
1950 | * @gfp: the atomicity of any memory allocations | |
1951 | * | |
1952 | * Prepare a blank set of credentials for modification. This must allocate all | |
1953 | * the memory the LSM module might require such that cred_transfer() can | |
1954 | * complete without error. | |
1955 | */ | |
1956 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1957 | { | |
7898e1f8 CS |
1958 | struct task_smack *tsp; |
1959 | ||
1960 | tsp = new_task_smack(NULL, NULL, gfp); | |
1961 | if (tsp == NULL) | |
676dac4b | 1962 | return -ENOMEM; |
7898e1f8 CS |
1963 | |
1964 | cred->security = tsp; | |
1965 | ||
ee18d64c DH |
1966 | return 0; |
1967 | } | |
1968 | ||
1969 | ||
e114e473 | 1970 | /** |
f1752eec DH |
1971 | * smack_cred_free - "free" task-level security credentials |
1972 | * @cred: the credentials in question | |
e114e473 | 1973 | * |
e114e473 | 1974 | */ |
f1752eec | 1975 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1976 | { |
7898e1f8 CS |
1977 | struct task_smack *tsp = cred->security; |
1978 | struct smack_rule *rp; | |
1979 | struct list_head *l; | |
1980 | struct list_head *n; | |
1981 | ||
1982 | if (tsp == NULL) | |
1983 | return; | |
1984 | cred->security = NULL; | |
1985 | ||
38416e53 ZJ |
1986 | smk_destroy_label_list(&tsp->smk_relabel); |
1987 | ||
7898e1f8 CS |
1988 | list_for_each_safe(l, n, &tsp->smk_rules) { |
1989 | rp = list_entry(l, struct smack_rule, list); | |
1990 | list_del(&rp->list); | |
1991 | kfree(rp); | |
1992 | } | |
1993 | kfree(tsp); | |
e114e473 CS |
1994 | } |
1995 | ||
d84f4f99 DH |
1996 | /** |
1997 | * smack_cred_prepare - prepare new set of credentials for modification | |
1998 | * @new: the new credentials | |
1999 | * @old: the original credentials | |
2000 | * @gfp: the atomicity of any memory allocations | |
2001 | * | |
2002 | * Prepare a new set of credentials for modification. | |
2003 | */ | |
2004 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
2005 | gfp_t gfp) | |
2006 | { | |
676dac4b CS |
2007 | struct task_smack *old_tsp = old->security; |
2008 | struct task_smack *new_tsp; | |
7898e1f8 | 2009 | int rc; |
676dac4b | 2010 | |
7898e1f8 | 2011 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
2012 | if (new_tsp == NULL) |
2013 | return -ENOMEM; | |
2014 | ||
7898e1f8 CS |
2015 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
2016 | if (rc != 0) | |
2017 | return rc; | |
2018 | ||
38416e53 ZJ |
2019 | rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel, |
2020 | gfp); | |
2021 | if (rc != 0) | |
2022 | return rc; | |
2023 | ||
676dac4b | 2024 | new->security = new_tsp; |
d84f4f99 DH |
2025 | return 0; |
2026 | } | |
2027 | ||
ee18d64c DH |
2028 | /** |
2029 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
2030 | * @new: the new credentials | |
2031 | * @old: the original credentials | |
2032 | * | |
2033 | * Fill in a set of blank credentials from another set of credentials. | |
2034 | */ | |
2035 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
2036 | { | |
676dac4b CS |
2037 | struct task_smack *old_tsp = old->security; |
2038 | struct task_smack *new_tsp = new->security; | |
2039 | ||
2040 | new_tsp->smk_task = old_tsp->smk_task; | |
2041 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
2042 | mutex_init(&new_tsp->smk_rules_lock); |
2043 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
2044 | ||
2045 | ||
2046 | /* cbs copy rule list */ | |
ee18d64c DH |
2047 | } |
2048 | ||
3a3b7ce9 DH |
2049 | /** |
2050 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
2051 | * @new: points to the set of credentials to be modified. |
2052 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
2053 | * |
2054 | * Set the security data for a kernel service. | |
2055 | */ | |
2056 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
2057 | { | |
676dac4b | 2058 | struct task_smack *new_tsp = new->security; |
2f823ff8 | 2059 | struct smack_known *skp = smack_from_secid(secid); |
3a3b7ce9 | 2060 | |
2f823ff8 | 2061 | if (skp == NULL) |
3a3b7ce9 DH |
2062 | return -EINVAL; |
2063 | ||
2f823ff8 | 2064 | new_tsp->smk_task = skp; |
3a3b7ce9 DH |
2065 | return 0; |
2066 | } | |
2067 | ||
2068 | /** | |
2069 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
2070 | * @new: points to the set of credentials to be modified |
2071 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
2072 | * |
2073 | * Set the file creation context in a set of credentials to the same | |
2074 | * as the objective context of the specified inode | |
2075 | */ | |
2076 | static int smack_kernel_create_files_as(struct cred *new, | |
2077 | struct inode *inode) | |
2078 | { | |
2079 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 2080 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 2081 | |
21c7eae2 | 2082 | tsp->smk_forked = isp->smk_inode; |
2f823ff8 | 2083 | tsp->smk_task = tsp->smk_forked; |
3a3b7ce9 DH |
2084 | return 0; |
2085 | } | |
2086 | ||
ecfcc53f EB |
2087 | /** |
2088 | * smk_curacc_on_task - helper to log task related access | |
2089 | * @p: the task object | |
531f1d45 CS |
2090 | * @access: the access requested |
2091 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
2092 | * |
2093 | * Return 0 if access is permitted | |
2094 | */ | |
531f1d45 CS |
2095 | static int smk_curacc_on_task(struct task_struct *p, int access, |
2096 | const char *caller) | |
ecfcc53f EB |
2097 | { |
2098 | struct smk_audit_info ad; | |
6d1cff2a | 2099 | struct smack_known *skp = smk_of_task_struct(p); |
d166c802 | 2100 | int rc; |
ecfcc53f | 2101 | |
531f1d45 | 2102 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 2103 | smk_ad_setfield_u_tsk(&ad, p); |
21c7eae2 | 2104 | rc = smk_curacc(skp, access, &ad); |
d166c802 CS |
2105 | rc = smk_bu_task(p, access, rc); |
2106 | return rc; | |
ecfcc53f EB |
2107 | } |
2108 | ||
e114e473 CS |
2109 | /** |
2110 | * smack_task_setpgid - Smack check on setting pgid | |
2111 | * @p: the task object | |
2112 | * @pgid: unused | |
2113 | * | |
2114 | * Return 0 if write access is permitted | |
2115 | */ | |
2116 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
2117 | { | |
531f1d45 | 2118 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2119 | } |
2120 | ||
2121 | /** | |
2122 | * smack_task_getpgid - Smack access check for getpgid | |
2123 | * @p: the object task | |
2124 | * | |
2125 | * Returns 0 if current can read the object task, error code otherwise | |
2126 | */ | |
2127 | static int smack_task_getpgid(struct task_struct *p) | |
2128 | { | |
531f1d45 | 2129 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2130 | } |
2131 | ||
2132 | /** | |
2133 | * smack_task_getsid - Smack access check for getsid | |
2134 | * @p: the object task | |
2135 | * | |
2136 | * Returns 0 if current can read the object task, error code otherwise | |
2137 | */ | |
2138 | static int smack_task_getsid(struct task_struct *p) | |
2139 | { | |
531f1d45 | 2140 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2141 | } |
2142 | ||
2143 | /** | |
2144 | * smack_task_getsecid - get the secid of the task | |
2145 | * @p: the object task | |
2146 | * @secid: where to put the result | |
2147 | * | |
2148 | * Sets the secid to contain a u32 version of the smack label. | |
2149 | */ | |
2150 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
2151 | { | |
6d1cff2a | 2152 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 CS |
2153 | |
2154 | *secid = skp->smk_secid; | |
e114e473 CS |
2155 | } |
2156 | ||
2157 | /** | |
2158 | * smack_task_setnice - Smack check on setting nice | |
2159 | * @p: the task object | |
2160 | * @nice: unused | |
2161 | * | |
2162 | * Return 0 if write access is permitted | |
2163 | */ | |
2164 | static int smack_task_setnice(struct task_struct *p, int nice) | |
2165 | { | |
b1d9e6b0 | 2166 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2167 | } |
2168 | ||
2169 | /** | |
2170 | * smack_task_setioprio - Smack check on setting ioprio | |
2171 | * @p: the task object | |
2172 | * @ioprio: unused | |
2173 | * | |
2174 | * Return 0 if write access is permitted | |
2175 | */ | |
2176 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
2177 | { | |
b1d9e6b0 | 2178 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2179 | } |
2180 | ||
2181 | /** | |
2182 | * smack_task_getioprio - Smack check on reading ioprio | |
2183 | * @p: the task object | |
2184 | * | |
2185 | * Return 0 if read access is permitted | |
2186 | */ | |
2187 | static int smack_task_getioprio(struct task_struct *p) | |
2188 | { | |
531f1d45 | 2189 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2190 | } |
2191 | ||
2192 | /** | |
2193 | * smack_task_setscheduler - Smack check on setting scheduler | |
2194 | * @p: the task object | |
2195 | * @policy: unused | |
2196 | * @lp: unused | |
2197 | * | |
2198 | * Return 0 if read access is permitted | |
2199 | */ | |
b0ae1981 | 2200 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 2201 | { |
b1d9e6b0 | 2202 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2203 | } |
2204 | ||
2205 | /** | |
2206 | * smack_task_getscheduler - Smack check on reading scheduler | |
2207 | * @p: the task object | |
2208 | * | |
2209 | * Return 0 if read access is permitted | |
2210 | */ | |
2211 | static int smack_task_getscheduler(struct task_struct *p) | |
2212 | { | |
531f1d45 | 2213 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2214 | } |
2215 | ||
2216 | /** | |
2217 | * smack_task_movememory - Smack check on moving memory | |
2218 | * @p: the task object | |
2219 | * | |
2220 | * Return 0 if write access is permitted | |
2221 | */ | |
2222 | static int smack_task_movememory(struct task_struct *p) | |
2223 | { | |
531f1d45 | 2224 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2225 | } |
2226 | ||
2227 | /** | |
2228 | * smack_task_kill - Smack check on signal delivery | |
2229 | * @p: the task object | |
2230 | * @info: unused | |
2231 | * @sig: unused | |
2232 | * @secid: identifies the smack to use in lieu of current's | |
2233 | * | |
2234 | * Return 0 if write access is permitted | |
2235 | * | |
2236 | * The secid behavior is an artifact of an SELinux hack | |
2237 | * in the USB code. Someday it may go away. | |
2238 | */ | |
2239 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
2240 | int sig, u32 secid) | |
2241 | { | |
ecfcc53f | 2242 | struct smk_audit_info ad; |
2f823ff8 | 2243 | struct smack_known *skp; |
6d1cff2a | 2244 | struct smack_known *tkp = smk_of_task_struct(p); |
d166c802 | 2245 | int rc; |
ecfcc53f EB |
2246 | |
2247 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
2248 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
2249 | /* |
2250 | * Sending a signal requires that the sender | |
2251 | * can write the receiver. | |
2252 | */ | |
d166c802 | 2253 | if (secid == 0) { |
21c7eae2 | 2254 | rc = smk_curacc(tkp, MAY_WRITE, &ad); |
d166c802 CS |
2255 | rc = smk_bu_task(p, MAY_WRITE, rc); |
2256 | return rc; | |
2257 | } | |
e114e473 CS |
2258 | /* |
2259 | * If the secid isn't 0 we're dealing with some USB IO | |
2260 | * specific behavior. This is not clean. For one thing | |
2261 | * we can't take privilege into account. | |
2262 | */ | |
2f823ff8 | 2263 | skp = smack_from_secid(secid); |
21c7eae2 LP |
2264 | rc = smk_access(skp, tkp, MAY_WRITE, &ad); |
2265 | rc = smk_bu_note("USB signal", skp, tkp, MAY_WRITE, rc); | |
d166c802 | 2266 | return rc; |
e114e473 CS |
2267 | } |
2268 | ||
2269 | /** | |
2270 | * smack_task_wait - Smack access check for waiting | |
2271 | * @p: task to wait for | |
2272 | * | |
c00bedb3 | 2273 | * Returns 0 |
e114e473 CS |
2274 | */ |
2275 | static int smack_task_wait(struct task_struct *p) | |
2276 | { | |
e114e473 | 2277 | /* |
c00bedb3 CS |
2278 | * Allow the operation to succeed. |
2279 | * Zombies are bad. | |
2280 | * In userless environments (e.g. phones) programs | |
2281 | * get marked with SMACK64EXEC and even if the parent | |
2282 | * and child shouldn't be talking the parent still | |
2283 | * may expect to know when the child exits. | |
e114e473 | 2284 | */ |
c00bedb3 | 2285 | return 0; |
e114e473 CS |
2286 | } |
2287 | ||
2288 | /** | |
2289 | * smack_task_to_inode - copy task smack into the inode blob | |
2290 | * @p: task to copy from | |
251a2a95 | 2291 | * @inode: inode to copy to |
e114e473 CS |
2292 | * |
2293 | * Sets the smack pointer in the inode security blob | |
2294 | */ | |
2295 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
2296 | { | |
2297 | struct inode_smack *isp = inode->i_security; | |
6d1cff2a | 2298 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 | 2299 | |
21c7eae2 | 2300 | isp->smk_inode = skp; |
e114e473 CS |
2301 | } |
2302 | ||
2303 | /* | |
2304 | * Socket hooks. | |
2305 | */ | |
2306 | ||
2307 | /** | |
2308 | * smack_sk_alloc_security - Allocate a socket blob | |
2309 | * @sk: the socket | |
2310 | * @family: unused | |
251a2a95 | 2311 | * @gfp_flags: memory allocation flags |
e114e473 CS |
2312 | * |
2313 | * Assign Smack pointers to current | |
2314 | * | |
2315 | * Returns 0 on success, -ENOMEM is there's no memory | |
2316 | */ | |
2317 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
2318 | { | |
2f823ff8 | 2319 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
2320 | struct socket_smack *ssp; |
2321 | ||
2322 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
2323 | if (ssp == NULL) | |
2324 | return -ENOMEM; | |
2325 | ||
54e70ec5 | 2326 | ssp->smk_in = skp; |
2f823ff8 | 2327 | ssp->smk_out = skp; |
272cd7a8 | 2328 | ssp->smk_packet = NULL; |
e114e473 CS |
2329 | |
2330 | sk->sk_security = ssp; | |
2331 | ||
2332 | return 0; | |
2333 | } | |
2334 | ||
2335 | /** | |
2336 | * smack_sk_free_security - Free a socket blob | |
2337 | * @sk: the socket | |
2338 | * | |
2339 | * Clears the blob pointer | |
2340 | */ | |
2341 | static void smack_sk_free_security(struct sock *sk) | |
2342 | { | |
2343 | kfree(sk->sk_security); | |
2344 | } | |
2345 | ||
07feee8f | 2346 | /** |
21abb1ec | 2347 | * smack_ipv4host_label - check host based restrictions |
07feee8f PM |
2348 | * @sip: the object end |
2349 | * | |
2350 | * looks for host based access restrictions | |
2351 | * | |
2352 | * This version will only be appropriate for really small sets of single label | |
2353 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2354 | * taken before calling this function. | |
2355 | * | |
2356 | * Returns the label of the far end or NULL if it's not special. | |
2357 | */ | |
21abb1ec | 2358 | static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip) |
07feee8f | 2359 | { |
21abb1ec | 2360 | struct smk_net4addr *snp; |
07feee8f PM |
2361 | struct in_addr *siap = &sip->sin_addr; |
2362 | ||
2363 | if (siap->s_addr == 0) | |
2364 | return NULL; | |
2365 | ||
21abb1ec CS |
2366 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) |
2367 | /* | |
2368 | * we break after finding the first match because | |
2369 | * the list is sorted from longest to shortest mask | |
2370 | * so we have found the most specific match | |
2371 | */ | |
2372 | if (snp->smk_host.s_addr == | |
2373 | (siap->s_addr & snp->smk_mask.s_addr)) | |
2374 | return snp->smk_label; | |
2375 | ||
2376 | return NULL; | |
2377 | } | |
2378 | ||
2379 | #if IS_ENABLED(CONFIG_IPV6) | |
2380 | /* | |
2381 | * smk_ipv6_localhost - Check for local ipv6 host address | |
2382 | * @sip: the address | |
2383 | * | |
2384 | * Returns boolean true if this is the localhost address | |
2385 | */ | |
2386 | static bool smk_ipv6_localhost(struct sockaddr_in6 *sip) | |
2387 | { | |
2388 | __be16 *be16p = (__be16 *)&sip->sin6_addr; | |
2389 | __be32 *be32p = (__be32 *)&sip->sin6_addr; | |
2390 | ||
2391 | if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 && | |
2392 | ntohs(be16p[7]) == 1) | |
2393 | return true; | |
2394 | return false; | |
2395 | } | |
2396 | ||
2397 | /** | |
2398 | * smack_ipv6host_label - check host based restrictions | |
2399 | * @sip: the object end | |
2400 | * | |
2401 | * looks for host based access restrictions | |
2402 | * | |
2403 | * This version will only be appropriate for really small sets of single label | |
2404 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2405 | * taken before calling this function. | |
2406 | * | |
2407 | * Returns the label of the far end or NULL if it's not special. | |
2408 | */ | |
2409 | static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip) | |
2410 | { | |
2411 | struct smk_net6addr *snp; | |
2412 | struct in6_addr *sap = &sip->sin6_addr; | |
2413 | int i; | |
2414 | int found = 0; | |
2415 | ||
2416 | /* | |
2417 | * It's local. Don't look for a host label. | |
2418 | */ | |
2419 | if (smk_ipv6_localhost(sip)) | |
2420 | return NULL; | |
2421 | ||
2422 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
07feee8f PM |
2423 | /* |
2424 | * we break after finding the first match because | |
2425 | * the list is sorted from longest to shortest mask | |
2426 | * so we have found the most specific match | |
2427 | */ | |
21abb1ec CS |
2428 | for (found = 1, i = 0; i < 8; i++) { |
2429 | /* | |
2430 | * If the label is NULL the entry has | |
2431 | * been renounced. Ignore it. | |
2432 | */ | |
2433 | if (snp->smk_label == NULL) | |
2434 | continue; | |
2435 | if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) != | |
2436 | snp->smk_host.s6_addr16[i]) { | |
2437 | found = 0; | |
2438 | break; | |
2439 | } | |
4303154e | 2440 | } |
21abb1ec CS |
2441 | if (found) |
2442 | return snp->smk_label; | |
2443 | } | |
07feee8f PM |
2444 | |
2445 | return NULL; | |
2446 | } | |
21abb1ec | 2447 | #endif /* CONFIG_IPV6 */ |
07feee8f | 2448 | |
e114e473 CS |
2449 | /** |
2450 | * smack_netlabel - Set the secattr on a socket | |
2451 | * @sk: the socket | |
6d3dc07c | 2452 | * @labeled: socket label scheme |
e114e473 CS |
2453 | * |
2454 | * Convert the outbound smack value (smk_out) to a | |
2455 | * secattr and attach it to the socket. | |
2456 | * | |
2457 | * Returns 0 on success or an error code | |
2458 | */ | |
6d3dc07c | 2459 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 2460 | { |
f7112e6c | 2461 | struct smack_known *skp; |
07feee8f | 2462 | struct socket_smack *ssp = sk->sk_security; |
6d3dc07c | 2463 | int rc = 0; |
e114e473 | 2464 | |
6d3dc07c CS |
2465 | /* |
2466 | * Usually the netlabel code will handle changing the | |
2467 | * packet labeling based on the label. | |
2468 | * The case of a single label host is different, because | |
2469 | * a single label host should never get a labeled packet | |
2470 | * even though the label is usually associated with a packet | |
2471 | * label. | |
2472 | */ | |
2473 | local_bh_disable(); | |
2474 | bh_lock_sock_nested(sk); | |
2475 | ||
2476 | if (ssp->smk_out == smack_net_ambient || | |
2477 | labeled == SMACK_UNLABELED_SOCKET) | |
2478 | netlbl_sock_delattr(sk); | |
2479 | else { | |
2f823ff8 | 2480 | skp = ssp->smk_out; |
f7112e6c | 2481 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
6d3dc07c CS |
2482 | } |
2483 | ||
2484 | bh_unlock_sock(sk); | |
2485 | local_bh_enable(); | |
4bc87e62 | 2486 | |
e114e473 CS |
2487 | return rc; |
2488 | } | |
2489 | ||
07feee8f PM |
2490 | /** |
2491 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
2492 | * @sk: the socket | |
2493 | * @sap: the destination address | |
2494 | * | |
2495 | * Set the correct secattr for the given socket based on the destination | |
2496 | * address and perform any outbound access checks needed. | |
2497 | * | |
2498 | * Returns 0 on success or an error code. | |
2499 | * | |
2500 | */ | |
2501 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
2502 | { | |
2f823ff8 | 2503 | struct smack_known *skp; |
07feee8f PM |
2504 | int rc; |
2505 | int sk_lbl; | |
21c7eae2 | 2506 | struct smack_known *hkp; |
07feee8f | 2507 | struct socket_smack *ssp = sk->sk_security; |
ecfcc53f | 2508 | struct smk_audit_info ad; |
07feee8f PM |
2509 | |
2510 | rcu_read_lock(); | |
21abb1ec | 2511 | hkp = smack_ipv4host_label(sap); |
21c7eae2 | 2512 | if (hkp != NULL) { |
ecfcc53f | 2513 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
2514 | struct lsm_network_audit net; |
2515 | ||
48c62af6 EP |
2516 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
2517 | ad.a.u.net->family = sap->sin_family; | |
2518 | ad.a.u.net->dport = sap->sin_port; | |
2519 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 2520 | #endif |
923e9a13 | 2521 | sk_lbl = SMACK_UNLABELED_SOCKET; |
2f823ff8 | 2522 | skp = ssp->smk_out; |
21c7eae2 LP |
2523 | rc = smk_access(skp, hkp, MAY_WRITE, &ad); |
2524 | rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc); | |
07feee8f PM |
2525 | } else { |
2526 | sk_lbl = SMACK_CIPSO_SOCKET; | |
2527 | rc = 0; | |
2528 | } | |
2529 | rcu_read_unlock(); | |
2530 | if (rc != 0) | |
2531 | return rc; | |
2532 | ||
2533 | return smack_netlabel(sk, sk_lbl); | |
2534 | } | |
2535 | ||
21abb1ec CS |
2536 | #if IS_ENABLED(CONFIG_IPV6) |
2537 | /** | |
2538 | * smk_ipv6_check - check Smack access | |
2539 | * @subject: subject Smack label | |
2540 | * @object: object Smack label | |
2541 | * @address: address | |
2542 | * @act: the action being taken | |
2543 | * | |
2544 | * Check an IPv6 access | |
2545 | */ | |
2546 | static int smk_ipv6_check(struct smack_known *subject, | |
2547 | struct smack_known *object, | |
2548 | struct sockaddr_in6 *address, int act) | |
2549 | { | |
2550 | #ifdef CONFIG_AUDIT | |
2551 | struct lsm_network_audit net; | |
2552 | #endif | |
2553 | struct smk_audit_info ad; | |
2554 | int rc; | |
2555 | ||
2556 | #ifdef CONFIG_AUDIT | |
2557 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2558 | ad.a.u.net->family = PF_INET6; | |
2559 | ad.a.u.net->dport = ntohs(address->sin6_port); | |
2560 | if (act == SMK_RECEIVING) | |
2561 | ad.a.u.net->v6info.saddr = address->sin6_addr; | |
2562 | else | |
2563 | ad.a.u.net->v6info.daddr = address->sin6_addr; | |
2564 | #endif | |
2565 | rc = smk_access(subject, object, MAY_WRITE, &ad); | |
2566 | rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc); | |
2567 | return rc; | |
2568 | } | |
2569 | #endif /* CONFIG_IPV6 */ | |
2570 | ||
2571 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 CS |
2572 | /** |
2573 | * smk_ipv6_port_label - Smack port access table management | |
2574 | * @sock: socket | |
2575 | * @address: address | |
2576 | * | |
2577 | * Create or update the port list entry | |
2578 | */ | |
2579 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2580 | { | |
2581 | struct sock *sk = sock->sk; | |
2582 | struct sockaddr_in6 *addr6; | |
2583 | struct socket_smack *ssp = sock->sk->sk_security; | |
2584 | struct smk_port_label *spp; | |
2585 | unsigned short port = 0; | |
2586 | ||
2587 | if (address == NULL) { | |
2588 | /* | |
2589 | * This operation is changing the Smack information | |
2590 | * on the bound socket. Take the changes to the port | |
2591 | * as well. | |
2592 | */ | |
2593 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2594 | if (sk != spp->smk_sock) | |
2595 | continue; | |
2596 | spp->smk_in = ssp->smk_in; | |
2597 | spp->smk_out = ssp->smk_out; | |
2598 | return; | |
2599 | } | |
2600 | /* | |
2601 | * A NULL address is only used for updating existing | |
2602 | * bound entries. If there isn't one, it's OK. | |
2603 | */ | |
2604 | return; | |
2605 | } | |
2606 | ||
2607 | addr6 = (struct sockaddr_in6 *)address; | |
2608 | port = ntohs(addr6->sin6_port); | |
2609 | /* | |
2610 | * This is a special case that is safely ignored. | |
2611 | */ | |
2612 | if (port == 0) | |
2613 | return; | |
2614 | ||
2615 | /* | |
2616 | * Look for an existing port list entry. | |
2617 | * This is an indication that a port is getting reused. | |
2618 | */ | |
2619 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2620 | if (spp->smk_port != port) | |
2621 | continue; | |
2622 | spp->smk_port = port; | |
2623 | spp->smk_sock = sk; | |
2624 | spp->smk_in = ssp->smk_in; | |
2625 | spp->smk_out = ssp->smk_out; | |
2626 | return; | |
2627 | } | |
2628 | ||
2629 | /* | |
2630 | * A new port entry is required. | |
2631 | */ | |
2632 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2633 | if (spp == NULL) | |
2634 | return; | |
2635 | ||
2636 | spp->smk_port = port; | |
2637 | spp->smk_sock = sk; | |
2638 | spp->smk_in = ssp->smk_in; | |
2639 | spp->smk_out = ssp->smk_out; | |
2640 | ||
2641 | list_add(&spp->list, &smk_ipv6_port_list); | |
2642 | return; | |
2643 | } | |
2644 | ||
2645 | /** | |
2646 | * smk_ipv6_port_check - check Smack port access | |
2647 | * @sock: socket | |
2648 | * @address: address | |
2649 | * | |
2650 | * Create or update the port list entry | |
2651 | */ | |
6ea06247 | 2652 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2653 | int act) |
2654 | { | |
c6739443 CS |
2655 | struct smk_port_label *spp; |
2656 | struct socket_smack *ssp = sk->sk_security; | |
21abb1ec CS |
2657 | struct smack_known *skp = NULL; |
2658 | unsigned short port; | |
21c7eae2 | 2659 | struct smack_known *object; |
c6739443 CS |
2660 | |
2661 | if (act == SMK_RECEIVING) { | |
21abb1ec | 2662 | skp = smack_ipv6host_label(address); |
21c7eae2 | 2663 | object = ssp->smk_in; |
c6739443 | 2664 | } else { |
2f823ff8 | 2665 | skp = ssp->smk_out; |
21abb1ec | 2666 | object = smack_ipv6host_label(address); |
c6739443 CS |
2667 | } |
2668 | ||
2669 | /* | |
21abb1ec | 2670 | * The other end is a single label host. |
c6739443 | 2671 | */ |
21abb1ec CS |
2672 | if (skp != NULL && object != NULL) |
2673 | return smk_ipv6_check(skp, object, address, act); | |
2674 | if (skp == NULL) | |
2675 | skp = smack_net_ambient; | |
2676 | if (object == NULL) | |
2677 | object = smack_net_ambient; | |
c6739443 CS |
2678 | |
2679 | /* | |
2680 | * It's remote, so port lookup does no good. | |
2681 | */ | |
21abb1ec CS |
2682 | if (!smk_ipv6_localhost(address)) |
2683 | return smk_ipv6_check(skp, object, address, act); | |
c6739443 CS |
2684 | |
2685 | /* | |
2686 | * It's local so the send check has to have passed. | |
2687 | */ | |
21abb1ec CS |
2688 | if (act == SMK_RECEIVING) |
2689 | return 0; | |
c6739443 | 2690 | |
21abb1ec | 2691 | port = ntohs(address->sin6_port); |
c6739443 CS |
2692 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { |
2693 | if (spp->smk_port != port) | |
2694 | continue; | |
21c7eae2 | 2695 | object = spp->smk_in; |
c6739443 | 2696 | if (act == SMK_CONNECTING) |
54e70ec5 | 2697 | ssp->smk_packet = spp->smk_out; |
c6739443 CS |
2698 | break; |
2699 | } | |
2700 | ||
21abb1ec | 2701 | return smk_ipv6_check(skp, object, address, act); |
c6739443 | 2702 | } |
21abb1ec | 2703 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2704 | |
e114e473 CS |
2705 | /** |
2706 | * smack_inode_setsecurity - set smack xattrs | |
2707 | * @inode: the object | |
2708 | * @name: attribute name | |
2709 | * @value: attribute value | |
2710 | * @size: size of the attribute | |
2711 | * @flags: unused | |
2712 | * | |
2713 | * Sets the named attribute in the appropriate blob | |
2714 | * | |
2715 | * Returns 0 on success, or an error code | |
2716 | */ | |
2717 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2718 | const void *value, size_t size, int flags) | |
2719 | { | |
2f823ff8 | 2720 | struct smack_known *skp; |
e114e473 CS |
2721 | struct inode_smack *nsp = inode->i_security; |
2722 | struct socket_smack *ssp; | |
2723 | struct socket *sock; | |
4bc87e62 | 2724 | int rc = 0; |
e114e473 | 2725 | |
f7112e6c | 2726 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2727 | return -EINVAL; |
e114e473 | 2728 | |
2f823ff8 | 2729 | skp = smk_import_entry(value, size); |
e774ad68 LP |
2730 | if (IS_ERR(skp)) |
2731 | return PTR_ERR(skp); | |
e114e473 CS |
2732 | |
2733 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
21c7eae2 | 2734 | nsp->smk_inode = skp; |
ddd29ec6 | 2735 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2736 | return 0; |
2737 | } | |
2738 | /* | |
2739 | * The rest of the Smack xattrs are only on sockets. | |
2740 | */ | |
2741 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2742 | return -EOPNOTSUPP; | |
2743 | ||
2744 | sock = SOCKET_I(inode); | |
2e1d146a | 2745 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2746 | return -EOPNOTSUPP; |
2747 | ||
2748 | ssp = sock->sk->sk_security; | |
2749 | ||
2750 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 2751 | ssp->smk_in = skp; |
e114e473 | 2752 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2753 | ssp->smk_out = skp; |
c6739443 | 2754 | if (sock->sk->sk_family == PF_INET) { |
b4e0d5f0 CS |
2755 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2756 | if (rc != 0) | |
2757 | printk(KERN_WARNING | |
2758 | "Smack: \"%s\" netlbl error %d.\n", | |
2759 | __func__, -rc); | |
2760 | } | |
e114e473 CS |
2761 | } else |
2762 | return -EOPNOTSUPP; | |
2763 | ||
21abb1ec | 2764 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2765 | if (sock->sk->sk_family == PF_INET6) |
2766 | smk_ipv6_port_label(sock, NULL); | |
21abb1ec | 2767 | #endif |
c6739443 | 2768 | |
e114e473 CS |
2769 | return 0; |
2770 | } | |
2771 | ||
2772 | /** | |
2773 | * smack_socket_post_create - finish socket setup | |
2774 | * @sock: the socket | |
2775 | * @family: protocol family | |
2776 | * @type: unused | |
2777 | * @protocol: unused | |
2778 | * @kern: unused | |
2779 | * | |
2780 | * Sets the netlabel information on the socket | |
2781 | * | |
2782 | * Returns 0 on success, and error code otherwise | |
2783 | */ | |
2784 | static int smack_socket_post_create(struct socket *sock, int family, | |
2785 | int type, int protocol, int kern) | |
2786 | { | |
7412301b ML |
2787 | struct socket_smack *ssp; |
2788 | ||
2789 | if (sock->sk == NULL) | |
2790 | return 0; | |
2791 | ||
2792 | /* | |
2793 | * Sockets created by kernel threads receive web label. | |
2794 | */ | |
2795 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2796 | ssp = sock->sk->sk_security; | |
2797 | ssp->smk_in = &smack_known_web; | |
2798 | ssp->smk_out = &smack_known_web; | |
2799 | } | |
2800 | ||
2801 | if (family != PF_INET) | |
e114e473 CS |
2802 | return 0; |
2803 | /* | |
2804 | * Set the outbound netlbl. | |
2805 | */ | |
6d3dc07c CS |
2806 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2807 | } | |
2808 | ||
21abb1ec | 2809 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2810 | /** |
2811 | * smack_socket_bind - record port binding information. | |
2812 | * @sock: the socket | |
2813 | * @address: the port address | |
2814 | * @addrlen: size of the address | |
2815 | * | |
2816 | * Records the label bound to a port. | |
2817 | * | |
2818 | * Returns 0 | |
2819 | */ | |
2820 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2821 | int addrlen) | |
2822 | { | |
2823 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) | |
2824 | smk_ipv6_port_label(sock, address); | |
c6739443 CS |
2825 | return 0; |
2826 | } | |
21abb1ec | 2827 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2828 | |
6d3dc07c CS |
2829 | /** |
2830 | * smack_socket_connect - connect access check | |
2831 | * @sock: the socket | |
2832 | * @sap: the other end | |
2833 | * @addrlen: size of sap | |
2834 | * | |
2835 | * Verifies that a connection may be possible | |
2836 | * | |
2837 | * Returns 0 on success, and error code otherwise | |
2838 | */ | |
2839 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2840 | int addrlen) | |
2841 | { | |
c6739443 | 2842 | int rc = 0; |
21abb1ec CS |
2843 | #if IS_ENABLED(CONFIG_IPV6) |
2844 | struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap; | |
2845 | #endif | |
2846 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
2847 | struct smack_known *rsp; | |
2848 | struct socket_smack *ssp = sock->sk->sk_security; | |
2849 | #endif | |
c6739443 CS |
2850 | |
2851 | if (sock->sk == NULL) | |
6d3dc07c | 2852 | return 0; |
6d3dc07c | 2853 | |
c6739443 CS |
2854 | switch (sock->sk->sk_family) { |
2855 | case PF_INET: | |
2856 | if (addrlen < sizeof(struct sockaddr_in)) | |
2857 | return -EINVAL; | |
2858 | rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); | |
2859 | break; | |
2860 | case PF_INET6: | |
2861 | if (addrlen < sizeof(struct sockaddr_in6)) | |
2862 | return -EINVAL; | |
21abb1ec CS |
2863 | #ifdef SMACK_IPV6_SECMARK_LABELING |
2864 | rsp = smack_ipv6host_label(sip); | |
2865 | if (rsp != NULL) | |
2866 | rc = smk_ipv6_check(ssp->smk_out, rsp, sip, | |
6ea06247 | 2867 | SMK_CONNECTING); |
21abb1ec CS |
2868 | #endif |
2869 | #ifdef SMACK_IPV6_PORT_LABELING | |
2870 | rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING); | |
2871 | #endif | |
c6739443 CS |
2872 | break; |
2873 | } | |
2874 | return rc; | |
e114e473 CS |
2875 | } |
2876 | ||
2877 | /** | |
2878 | * smack_flags_to_may - convert S_ to MAY_ values | |
2879 | * @flags: the S_ value | |
2880 | * | |
2881 | * Returns the equivalent MAY_ value | |
2882 | */ | |
2883 | static int smack_flags_to_may(int flags) | |
2884 | { | |
2885 | int may = 0; | |
2886 | ||
2887 | if (flags & S_IRUGO) | |
2888 | may |= MAY_READ; | |
2889 | if (flags & S_IWUGO) | |
2890 | may |= MAY_WRITE; | |
2891 | if (flags & S_IXUGO) | |
2892 | may |= MAY_EXEC; | |
2893 | ||
2894 | return may; | |
2895 | } | |
2896 | ||
2897 | /** | |
2898 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2899 | * @msg: the object | |
2900 | * | |
2901 | * Returns 0 | |
2902 | */ | |
2903 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2904 | { | |
2f823ff8 CS |
2905 | struct smack_known *skp = smk_of_current(); |
2906 | ||
21c7eae2 | 2907 | msg->security = skp; |
e114e473 CS |
2908 | return 0; |
2909 | } | |
2910 | ||
2911 | /** | |
2912 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2913 | * @msg: the object | |
2914 | * | |
2915 | * Clears the blob pointer | |
2916 | */ | |
2917 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2918 | { | |
2919 | msg->security = NULL; | |
2920 | } | |
2921 | ||
2922 | /** | |
2923 | * smack_of_shm - the smack pointer for the shm | |
2924 | * @shp: the object | |
2925 | * | |
2926 | * Returns a pointer to the smack value | |
2927 | */ | |
21c7eae2 | 2928 | static struct smack_known *smack_of_shm(struct shmid_kernel *shp) |
e114e473 | 2929 | { |
21c7eae2 | 2930 | return (struct smack_known *)shp->shm_perm.security; |
e114e473 CS |
2931 | } |
2932 | ||
2933 | /** | |
2934 | * smack_shm_alloc_security - Set the security blob for shm | |
2935 | * @shp: the object | |
2936 | * | |
2937 | * Returns 0 | |
2938 | */ | |
2939 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2940 | { | |
2941 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2f823ff8 | 2942 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2943 | |
21c7eae2 | 2944 | isp->security = skp; |
e114e473 CS |
2945 | return 0; |
2946 | } | |
2947 | ||
2948 | /** | |
2949 | * smack_shm_free_security - Clear the security blob for shm | |
2950 | * @shp: the object | |
2951 | * | |
2952 | * Clears the blob pointer | |
2953 | */ | |
2954 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2955 | { | |
2956 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2957 | ||
2958 | isp->security = NULL; | |
2959 | } | |
2960 | ||
ecfcc53f EB |
2961 | /** |
2962 | * smk_curacc_shm : check if current has access on shm | |
2963 | * @shp : the object | |
2964 | * @access : access requested | |
2965 | * | |
2966 | * Returns 0 if current has the requested access, error code otherwise | |
2967 | */ | |
2968 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2969 | { | |
21c7eae2 | 2970 | struct smack_known *ssp = smack_of_shm(shp); |
ecfcc53f | 2971 | struct smk_audit_info ad; |
d166c802 | 2972 | int rc; |
ecfcc53f EB |
2973 | |
2974 | #ifdef CONFIG_AUDIT | |
2975 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2976 | ad.a.u.ipc_id = shp->shm_perm.id; | |
2977 | #endif | |
d166c802 CS |
2978 | rc = smk_curacc(ssp, access, &ad); |
2979 | rc = smk_bu_current("shm", ssp, access, rc); | |
2980 | return rc; | |
ecfcc53f EB |
2981 | } |
2982 | ||
e114e473 CS |
2983 | /** |
2984 | * smack_shm_associate - Smack access check for shm | |
2985 | * @shp: the object | |
2986 | * @shmflg: access requested | |
2987 | * | |
2988 | * Returns 0 if current has the requested access, error code otherwise | |
2989 | */ | |
2990 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
2991 | { | |
e114e473 CS |
2992 | int may; |
2993 | ||
2994 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2995 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2996 | } |
2997 | ||
2998 | /** | |
2999 | * smack_shm_shmctl - Smack access check for shm | |
3000 | * @shp: the object | |
3001 | * @cmd: what it wants to do | |
3002 | * | |
3003 | * Returns 0 if current has the requested access, error code otherwise | |
3004 | */ | |
3005 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
3006 | { | |
e114e473 CS |
3007 | int may; |
3008 | ||
3009 | switch (cmd) { | |
3010 | case IPC_STAT: | |
3011 | case SHM_STAT: | |
3012 | may = MAY_READ; | |
3013 | break; | |
3014 | case IPC_SET: | |
3015 | case SHM_LOCK: | |
3016 | case SHM_UNLOCK: | |
3017 | case IPC_RMID: | |
3018 | may = MAY_READWRITE; | |
3019 | break; | |
3020 | case IPC_INFO: | |
3021 | case SHM_INFO: | |
3022 | /* | |
3023 | * System level information. | |
3024 | */ | |
3025 | return 0; | |
3026 | default: | |
3027 | return -EINVAL; | |
3028 | } | |
ecfcc53f | 3029 | return smk_curacc_shm(shp, may); |
e114e473 CS |
3030 | } |
3031 | ||
3032 | /** | |
3033 | * smack_shm_shmat - Smack access for shmat | |
3034 | * @shp: the object | |
3035 | * @shmaddr: unused | |
3036 | * @shmflg: access requested | |
3037 | * | |
3038 | * Returns 0 if current has the requested access, error code otherwise | |
3039 | */ | |
3040 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
3041 | int shmflg) | |
3042 | { | |
e114e473 CS |
3043 | int may; |
3044 | ||
3045 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 3046 | return smk_curacc_shm(shp, may); |
e114e473 CS |
3047 | } |
3048 | ||
3049 | /** | |
3050 | * smack_of_sem - the smack pointer for the sem | |
3051 | * @sma: the object | |
3052 | * | |
3053 | * Returns a pointer to the smack value | |
3054 | */ | |
21c7eae2 | 3055 | static struct smack_known *smack_of_sem(struct sem_array *sma) |
e114e473 | 3056 | { |
21c7eae2 | 3057 | return (struct smack_known *)sma->sem_perm.security; |
e114e473 CS |
3058 | } |
3059 | ||
3060 | /** | |
3061 | * smack_sem_alloc_security - Set the security blob for sem | |
3062 | * @sma: the object | |
3063 | * | |
3064 | * Returns 0 | |
3065 | */ | |
3066 | static int smack_sem_alloc_security(struct sem_array *sma) | |
3067 | { | |
3068 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2f823ff8 | 3069 | struct smack_known *skp = smk_of_current(); |
e114e473 | 3070 | |
21c7eae2 | 3071 | isp->security = skp; |
e114e473 CS |
3072 | return 0; |
3073 | } | |
3074 | ||
3075 | /** | |
3076 | * smack_sem_free_security - Clear the security blob for sem | |
3077 | * @sma: the object | |
3078 | * | |
3079 | * Clears the blob pointer | |
3080 | */ | |
3081 | static void smack_sem_free_security(struct sem_array *sma) | |
3082 | { | |
3083 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
3084 | ||
3085 | isp->security = NULL; | |
3086 | } | |
3087 | ||
ecfcc53f EB |
3088 | /** |
3089 | * smk_curacc_sem : check if current has access on sem | |
3090 | * @sma : the object | |
3091 | * @access : access requested | |
3092 | * | |
3093 | * Returns 0 if current has the requested access, error code otherwise | |
3094 | */ | |
3095 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
3096 | { | |
21c7eae2 | 3097 | struct smack_known *ssp = smack_of_sem(sma); |
ecfcc53f | 3098 | struct smk_audit_info ad; |
d166c802 | 3099 | int rc; |
ecfcc53f EB |
3100 | |
3101 | #ifdef CONFIG_AUDIT | |
3102 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3103 | ad.a.u.ipc_id = sma->sem_perm.id; | |
3104 | #endif | |
d166c802 CS |
3105 | rc = smk_curacc(ssp, access, &ad); |
3106 | rc = smk_bu_current("sem", ssp, access, rc); | |
3107 | return rc; | |
ecfcc53f EB |
3108 | } |
3109 | ||
e114e473 CS |
3110 | /** |
3111 | * smack_sem_associate - Smack access check for sem | |
3112 | * @sma: the object | |
3113 | * @semflg: access requested | |
3114 | * | |
3115 | * Returns 0 if current has the requested access, error code otherwise | |
3116 | */ | |
3117 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
3118 | { | |
e114e473 CS |
3119 | int may; |
3120 | ||
3121 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 3122 | return smk_curacc_sem(sma, may); |
e114e473 CS |
3123 | } |
3124 | ||
3125 | /** | |
3126 | * smack_sem_shmctl - Smack access check for sem | |
3127 | * @sma: the object | |
3128 | * @cmd: what it wants to do | |
3129 | * | |
3130 | * Returns 0 if current has the requested access, error code otherwise | |
3131 | */ | |
3132 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
3133 | { | |
e114e473 CS |
3134 | int may; |
3135 | ||
3136 | switch (cmd) { | |
3137 | case GETPID: | |
3138 | case GETNCNT: | |
3139 | case GETZCNT: | |
3140 | case GETVAL: | |
3141 | case GETALL: | |
3142 | case IPC_STAT: | |
3143 | case SEM_STAT: | |
3144 | may = MAY_READ; | |
3145 | break; | |
3146 | case SETVAL: | |
3147 | case SETALL: | |
3148 | case IPC_RMID: | |
3149 | case IPC_SET: | |
3150 | may = MAY_READWRITE; | |
3151 | break; | |
3152 | case IPC_INFO: | |
3153 | case SEM_INFO: | |
3154 | /* | |
3155 | * System level information | |
3156 | */ | |
3157 | return 0; | |
3158 | default: | |
3159 | return -EINVAL; | |
3160 | } | |
3161 | ||
ecfcc53f | 3162 | return smk_curacc_sem(sma, may); |
e114e473 CS |
3163 | } |
3164 | ||
3165 | /** | |
3166 | * smack_sem_semop - Smack checks of semaphore operations | |
3167 | * @sma: the object | |
3168 | * @sops: unused | |
3169 | * @nsops: unused | |
3170 | * @alter: unused | |
3171 | * | |
3172 | * Treated as read and write in all cases. | |
3173 | * | |
3174 | * Returns 0 if access is allowed, error code otherwise | |
3175 | */ | |
3176 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
3177 | unsigned nsops, int alter) | |
3178 | { | |
ecfcc53f | 3179 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
3180 | } |
3181 | ||
3182 | /** | |
3183 | * smack_msg_alloc_security - Set the security blob for msg | |
3184 | * @msq: the object | |
3185 | * | |
3186 | * Returns 0 | |
3187 | */ | |
3188 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
3189 | { | |
3190 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2f823ff8 | 3191 | struct smack_known *skp = smk_of_current(); |
e114e473 | 3192 | |
21c7eae2 | 3193 | kisp->security = skp; |
e114e473 CS |
3194 | return 0; |
3195 | } | |
3196 | ||
3197 | /** | |
3198 | * smack_msg_free_security - Clear the security blob for msg | |
3199 | * @msq: the object | |
3200 | * | |
3201 | * Clears the blob pointer | |
3202 | */ | |
3203 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
3204 | { | |
3205 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
3206 | ||
3207 | kisp->security = NULL; | |
3208 | } | |
3209 | ||
3210 | /** | |
3211 | * smack_of_msq - the smack pointer for the msq | |
3212 | * @msq: the object | |
3213 | * | |
21c7eae2 | 3214 | * Returns a pointer to the smack label entry |
e114e473 | 3215 | */ |
21c7eae2 | 3216 | static struct smack_known *smack_of_msq(struct msg_queue *msq) |
e114e473 | 3217 | { |
21c7eae2 | 3218 | return (struct smack_known *)msq->q_perm.security; |
e114e473 CS |
3219 | } |
3220 | ||
ecfcc53f EB |
3221 | /** |
3222 | * smk_curacc_msq : helper to check if current has access on msq | |
3223 | * @msq : the msq | |
3224 | * @access : access requested | |
3225 | * | |
3226 | * return 0 if current has access, error otherwise | |
3227 | */ | |
3228 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
3229 | { | |
21c7eae2 | 3230 | struct smack_known *msp = smack_of_msq(msq); |
ecfcc53f | 3231 | struct smk_audit_info ad; |
d166c802 | 3232 | int rc; |
ecfcc53f EB |
3233 | |
3234 | #ifdef CONFIG_AUDIT | |
3235 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3236 | ad.a.u.ipc_id = msq->q_perm.id; | |
3237 | #endif | |
d166c802 CS |
3238 | rc = smk_curacc(msp, access, &ad); |
3239 | rc = smk_bu_current("msq", msp, access, rc); | |
3240 | return rc; | |
ecfcc53f EB |
3241 | } |
3242 | ||
e114e473 CS |
3243 | /** |
3244 | * smack_msg_queue_associate - Smack access check for msg_queue | |
3245 | * @msq: the object | |
3246 | * @msqflg: access requested | |
3247 | * | |
3248 | * Returns 0 if current has the requested access, error code otherwise | |
3249 | */ | |
3250 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
3251 | { | |
e114e473 CS |
3252 | int may; |
3253 | ||
3254 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 3255 | return smk_curacc_msq(msq, may); |
e114e473 CS |
3256 | } |
3257 | ||
3258 | /** | |
3259 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
3260 | * @msq: the object | |
3261 | * @cmd: what it wants to do | |
3262 | * | |
3263 | * Returns 0 if current has the requested access, error code otherwise | |
3264 | */ | |
3265 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
3266 | { | |
e114e473 CS |
3267 | int may; |
3268 | ||
3269 | switch (cmd) { | |
3270 | case IPC_STAT: | |
3271 | case MSG_STAT: | |
3272 | may = MAY_READ; | |
3273 | break; | |
3274 | case IPC_SET: | |
3275 | case IPC_RMID: | |
3276 | may = MAY_READWRITE; | |
3277 | break; | |
3278 | case IPC_INFO: | |
3279 | case MSG_INFO: | |
3280 | /* | |
3281 | * System level information | |
3282 | */ | |
3283 | return 0; | |
3284 | default: | |
3285 | return -EINVAL; | |
3286 | } | |
3287 | ||
ecfcc53f | 3288 | return smk_curacc_msq(msq, may); |
e114e473 CS |
3289 | } |
3290 | ||
3291 | /** | |
3292 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
3293 | * @msq: the object | |
3294 | * @msg: unused | |
3295 | * @msqflg: access requested | |
3296 | * | |
3297 | * Returns 0 if current has the requested access, error code otherwise | |
3298 | */ | |
3299 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
3300 | int msqflg) | |
3301 | { | |
ecfcc53f | 3302 | int may; |
e114e473 | 3303 | |
ecfcc53f EB |
3304 | may = smack_flags_to_may(msqflg); |
3305 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
3306 | } |
3307 | ||
3308 | /** | |
3309 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
3310 | * @msq: the object | |
3311 | * @msg: unused | |
3312 | * @target: unused | |
3313 | * @type: unused | |
3314 | * @mode: unused | |
3315 | * | |
3316 | * Returns 0 if current has read and write access, error code otherwise | |
3317 | */ | |
3318 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
3319 | struct task_struct *target, long type, int mode) | |
3320 | { | |
ecfcc53f | 3321 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
3322 | } |
3323 | ||
3324 | /** | |
3325 | * smack_ipc_permission - Smack access for ipc_permission() | |
3326 | * @ipp: the object permissions | |
3327 | * @flag: access requested | |
3328 | * | |
3329 | * Returns 0 if current has read and write access, error code otherwise | |
3330 | */ | |
3331 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
3332 | { | |
21c7eae2 | 3333 | struct smack_known *iskp = ipp->security; |
ecfcc53f EB |
3334 | int may = smack_flags_to_may(flag); |
3335 | struct smk_audit_info ad; | |
d166c802 | 3336 | int rc; |
e114e473 | 3337 | |
ecfcc53f EB |
3338 | #ifdef CONFIG_AUDIT |
3339 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3340 | ad.a.u.ipc_id = ipp->id; | |
3341 | #endif | |
21c7eae2 LP |
3342 | rc = smk_curacc(iskp, may, &ad); |
3343 | rc = smk_bu_current("svipc", iskp, may, rc); | |
d166c802 | 3344 | return rc; |
e114e473 CS |
3345 | } |
3346 | ||
d20bdda6 AD |
3347 | /** |
3348 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 3349 | * @ipp: the object permissions |
d20bdda6 AD |
3350 | * @secid: where result will be saved |
3351 | */ | |
3352 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
3353 | { | |
21c7eae2 | 3354 | struct smack_known *iskp = ipp->security; |
d20bdda6 | 3355 | |
21c7eae2 | 3356 | *secid = iskp->smk_secid; |
d20bdda6 AD |
3357 | } |
3358 | ||
e114e473 CS |
3359 | /** |
3360 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 3361 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
3362 | * @inode: the object |
3363 | * | |
3364 | * Set the inode's security blob if it hasn't been done already. | |
3365 | */ | |
3366 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
3367 | { | |
3368 | struct super_block *sbp; | |
3369 | struct superblock_smack *sbsp; | |
3370 | struct inode_smack *isp; | |
2f823ff8 CS |
3371 | struct smack_known *skp; |
3372 | struct smack_known *ckp = smk_of_current(); | |
21c7eae2 | 3373 | struct smack_known *final; |
5c6d1125 JS |
3374 | char trattr[TRANS_TRUE_SIZE]; |
3375 | int transflag = 0; | |
2267b13a | 3376 | int rc; |
e114e473 CS |
3377 | struct dentry *dp; |
3378 | ||
3379 | if (inode == NULL) | |
3380 | return; | |
3381 | ||
3382 | isp = inode->i_security; | |
3383 | ||
3384 | mutex_lock(&isp->smk_lock); | |
3385 | /* | |
3386 | * If the inode is already instantiated | |
3387 | * take the quick way out | |
3388 | */ | |
3389 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
3390 | goto unlockandout; | |
3391 | ||
3392 | sbp = inode->i_sb; | |
3393 | sbsp = sbp->s_security; | |
3394 | /* | |
3395 | * We're going to use the superblock default label | |
3396 | * if there's no label on the file. | |
3397 | */ | |
3398 | final = sbsp->smk_default; | |
3399 | ||
e97dcb0e CS |
3400 | /* |
3401 | * If this is the root inode the superblock | |
3402 | * may be in the process of initialization. | |
3403 | * If that is the case use the root value out | |
3404 | * of the superblock. | |
3405 | */ | |
3406 | if (opt_dentry->d_parent == opt_dentry) { | |
1d8c2326 ŁS |
3407 | switch (sbp->s_magic) { |
3408 | case CGROUP_SUPER_MAGIC: | |
36ea735b CS |
3409 | /* |
3410 | * The cgroup filesystem is never mounted, | |
3411 | * so there's no opportunity to set the mount | |
3412 | * options. | |
3413 | */ | |
21c7eae2 LP |
3414 | sbsp->smk_root = &smack_known_star; |
3415 | sbsp->smk_default = &smack_known_star; | |
1d8c2326 ŁS |
3416 | isp->smk_inode = sbsp->smk_root; |
3417 | break; | |
3418 | case TMPFS_MAGIC: | |
3419 | /* | |
3420 | * What about shmem/tmpfs anonymous files with dentry | |
3421 | * obtained from d_alloc_pseudo()? | |
3422 | */ | |
3423 | isp->smk_inode = smk_of_current(); | |
3424 | break; | |
8da4aba5 RK |
3425 | case PIPEFS_MAGIC: |
3426 | isp->smk_inode = smk_of_current(); | |
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 CS |
3444 | case PIPEFS_MAGIC: |
3445 | case SOCKFS_MAGIC: | |
3446 | case CGROUP_SUPER_MAGIC: | |
e114e473 | 3447 | /* |
25985edc | 3448 | * Casey says that it's a little embarrassing |
e114e473 CS |
3449 | * that the smack file system doesn't do |
3450 | * extended attributes. | |
36ea735b | 3451 | * |
e114e473 | 3452 | * Casey says pipes are easy (?) |
36ea735b CS |
3453 | * |
3454 | * Socket access is controlled by the socket | |
3455 | * structures associated with the task involved. | |
3456 | * | |
3457 | * Cgroupfs is special | |
e114e473 | 3458 | */ |
21c7eae2 | 3459 | final = &smack_known_star; |
e114e473 CS |
3460 | break; |
3461 | case DEVPTS_SUPER_MAGIC: | |
3462 | /* | |
3463 | * devpts seems content with the label of the task. | |
3464 | * Programs that change smack have to treat the | |
3465 | * pty with respect. | |
3466 | */ | |
21c7eae2 | 3467 | final = ckp; |
e114e473 | 3468 | break; |
e114e473 CS |
3469 | case PROC_SUPER_MAGIC: |
3470 | /* | |
3471 | * Casey says procfs appears not to care. | |
3472 | * The superblock default suffices. | |
3473 | */ | |
3474 | break; | |
3475 | case TMPFS_MAGIC: | |
3476 | /* | |
3477 | * Device labels should come from the filesystem, | |
3478 | * but watch out, because they're volitile, | |
3479 | * getting recreated on every reboot. | |
3480 | */ | |
21c7eae2 | 3481 | final = &smack_known_star; |
e114e473 CS |
3482 | /* |
3483 | * No break. | |
3484 | * | |
3485 | * If a smack value has been set we want to use it, | |
3486 | * but since tmpfs isn't giving us the opportunity | |
3487 | * to set mount options simulate setting the | |
3488 | * superblock default. | |
3489 | */ | |
3490 | default: | |
3491 | /* | |
3492 | * This isn't an understood special case. | |
3493 | * Get the value from the xattr. | |
b4e0d5f0 CS |
3494 | */ |
3495 | ||
3496 | /* | |
3497 | * UNIX domain sockets use lower level socket data. | |
3498 | */ | |
3499 | if (S_ISSOCK(inode->i_mode)) { | |
21c7eae2 | 3500 | final = &smack_known_star; |
b4e0d5f0 CS |
3501 | break; |
3502 | } | |
3503 | /* | |
e114e473 CS |
3504 | * No xattr support means, alas, no SMACK label. |
3505 | * Use the aforeapplied default. | |
3506 | * It would be curious if the label of the task | |
3507 | * does not match that assigned. | |
3508 | */ | |
3509 | if (inode->i_op->getxattr == NULL) | |
3510 | break; | |
3511 | /* | |
3512 | * Get the dentry for xattr. | |
3513 | */ | |
3e62cbb8 | 3514 | dp = dget(opt_dentry); |
2f823ff8 | 3515 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
e774ad68 | 3516 | if (!IS_ERR_OR_NULL(skp)) |
21c7eae2 | 3517 | final = skp; |
2267b13a CS |
3518 | |
3519 | /* | |
3520 | * Transmuting directory | |
3521 | */ | |
3522 | if (S_ISDIR(inode->i_mode)) { | |
3523 | /* | |
3524 | * If this is a new directory and the label was | |
3525 | * transmuted when the inode was initialized | |
3526 | * set the transmute attribute on the directory | |
3527 | * and mark the inode. | |
3528 | * | |
3529 | * If there is a transmute attribute on the | |
3530 | * directory mark the inode. | |
3531 | */ | |
3532 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
3533 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
3767e255 | 3534 | rc = inode->i_op->setxattr(dp, inode, |
5c6d1125 | 3535 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
3536 | TRANS_TRUE, TRANS_TRUE_SIZE, |
3537 | 0); | |
3538 | } else { | |
ce23e640 | 3539 | rc = inode->i_op->getxattr(dp, inode, |
2267b13a CS |
3540 | XATTR_NAME_SMACKTRANSMUTE, trattr, |
3541 | TRANS_TRUE_SIZE); | |
3542 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
3543 | TRANS_TRUE_SIZE) != 0) | |
3544 | rc = -EINVAL; | |
5c6d1125 | 3545 | } |
2267b13a CS |
3546 | if (rc >= 0) |
3547 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 3548 | } |
9f50eda2 SF |
3549 | if (!(sbsp->smk_flags & SMK_SB_UNTRUSTED)) { |
3550 | /* | |
3551 | * Don't let the exec or mmap label be "*" or "@". | |
3552 | */ | |
3553 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
3554 | if (IS_ERR(skp) || skp == &smack_known_star || | |
3555 | skp == &smack_known_web) | |
3556 | skp = NULL; | |
3557 | isp->smk_task = skp; | |
3558 | } | |
e774ad68 | 3559 | |
19760ad0 | 3560 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
e774ad68 LP |
3561 | if (IS_ERR(skp) || skp == &smack_known_star || |
3562 | skp == &smack_known_web) | |
19760ad0 CS |
3563 | skp = NULL; |
3564 | isp->smk_mmap = skp; | |
676dac4b | 3565 | |
e114e473 CS |
3566 | dput(dp); |
3567 | break; | |
3568 | } | |
3569 | ||
3570 | if (final == NULL) | |
21c7eae2 | 3571 | isp->smk_inode = ckp; |
e114e473 CS |
3572 | else |
3573 | isp->smk_inode = final; | |
3574 | ||
5c6d1125 | 3575 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
3576 | |
3577 | unlockandout: | |
3578 | mutex_unlock(&isp->smk_lock); | |
3579 | return; | |
3580 | } | |
3581 | ||
3582 | /** | |
3583 | * smack_getprocattr - Smack process attribute access | |
3584 | * @p: the object task | |
3585 | * @name: the name of the attribute in /proc/.../attr | |
3586 | * @value: where to put the result | |
3587 | * | |
3588 | * Places a copy of the task Smack into value | |
3589 | * | |
3590 | * Returns the length of the smack label or an error code | |
3591 | */ | |
3592 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
3593 | { | |
6d1cff2a | 3594 | struct smack_known *skp = smk_of_task_struct(p); |
e114e473 CS |
3595 | char *cp; |
3596 | int slen; | |
3597 | ||
3598 | if (strcmp(name, "current") != 0) | |
3599 | return -EINVAL; | |
3600 | ||
2f823ff8 | 3601 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
3602 | if (cp == NULL) |
3603 | return -ENOMEM; | |
3604 | ||
3605 | slen = strlen(cp); | |
3606 | *value = cp; | |
3607 | return slen; | |
3608 | } | |
3609 | ||
3610 | /** | |
3611 | * smack_setprocattr - Smack process attribute setting | |
3612 | * @p: the object task | |
3613 | * @name: the name of the attribute in /proc/.../attr | |
3614 | * @value: the value to set | |
3615 | * @size: the size of the value | |
3616 | * | |
3617 | * Sets the Smack value of the task. Only setting self | |
3618 | * is permitted and only with privilege | |
3619 | * | |
3620 | * Returns the length of the smack label or an error code | |
3621 | */ | |
3622 | static int smack_setprocattr(struct task_struct *p, char *name, | |
3623 | void *value, size_t size) | |
3624 | { | |
38416e53 | 3625 | struct task_smack *tsp = current_security(); |
d84f4f99 | 3626 | struct cred *new; |
2f823ff8 | 3627 | struct smack_known *skp; |
38416e53 ZJ |
3628 | struct smack_known_list_elem *sklep; |
3629 | int rc; | |
e114e473 | 3630 | |
e114e473 CS |
3631 | /* |
3632 | * Changing another process' Smack value is too dangerous | |
3633 | * and supports no sane use case. | |
3634 | */ | |
3635 | if (p != current) | |
3636 | return -EPERM; | |
3637 | ||
38416e53 | 3638 | if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel)) |
5cd9c58f DH |
3639 | return -EPERM; |
3640 | ||
f7112e6c | 3641 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3642 | return -EINVAL; |
3643 | ||
3644 | if (strcmp(name, "current") != 0) | |
3645 | return -EINVAL; | |
3646 | ||
2f823ff8 | 3647 | skp = smk_import_entry(value, size); |
e774ad68 LP |
3648 | if (IS_ERR(skp)) |
3649 | return PTR_ERR(skp); | |
e114e473 | 3650 | |
6d3dc07c CS |
3651 | /* |
3652 | * No process is ever allowed the web ("@") label. | |
3653 | */ | |
2f823ff8 | 3654 | if (skp == &smack_known_web) |
6d3dc07c CS |
3655 | return -EPERM; |
3656 | ||
38416e53 ZJ |
3657 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
3658 | rc = -EPERM; | |
3659 | list_for_each_entry(sklep, &tsp->smk_relabel, list) | |
3660 | if (sklep->smk_label == skp) { | |
3661 | rc = 0; | |
3662 | break; | |
3663 | } | |
3664 | if (rc) | |
3665 | return rc; | |
3666 | } | |
3667 | ||
d84f4f99 | 3668 | new = prepare_creds(); |
6d3dc07c | 3669 | if (new == NULL) |
d84f4f99 | 3670 | return -ENOMEM; |
7898e1f8 | 3671 | |
46a2f3b9 | 3672 | tsp = new->security; |
2f823ff8 | 3673 | tsp->smk_task = skp; |
38416e53 ZJ |
3674 | /* |
3675 | * process can change its label only once | |
3676 | */ | |
3677 | smk_destroy_label_list(&tsp->smk_relabel); | |
7898e1f8 | 3678 | |
d84f4f99 | 3679 | commit_creds(new); |
e114e473 CS |
3680 | return size; |
3681 | } | |
3682 | ||
3683 | /** | |
3684 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3685 | * @sock: one sock |
3686 | * @other: the other sock | |
e114e473 CS |
3687 | * @newsk: unused |
3688 | * | |
3689 | * Return 0 if a subject with the smack of sock could access | |
3690 | * an object with the smack of other, otherwise an error code | |
3691 | */ | |
3610cda5 DM |
3692 | static int smack_unix_stream_connect(struct sock *sock, |
3693 | struct sock *other, struct sock *newsk) | |
e114e473 | 3694 | { |
2f823ff8 | 3695 | struct smack_known *skp; |
54e70ec5 | 3696 | struct smack_known *okp; |
d2e7ad19 JM |
3697 | struct socket_smack *ssp = sock->sk_security; |
3698 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 3699 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 3700 | struct smk_audit_info ad; |
b4e0d5f0 | 3701 | int rc = 0; |
923e9a13 KC |
3702 | #ifdef CONFIG_AUDIT |
3703 | struct lsm_network_audit net; | |
923e9a13 | 3704 | #endif |
b4e0d5f0 | 3705 | |
2f823ff8 CS |
3706 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3707 | skp = ssp->smk_out; | |
96be7b54 | 3708 | okp = osp->smk_in; |
54e70ec5 CS |
3709 | #ifdef CONFIG_AUDIT |
3710 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3711 | smk_ad_setfield_u_net_sk(&ad, other); | |
3712 | #endif | |
21c7eae2 LP |
3713 | rc = smk_access(skp, okp, MAY_WRITE, &ad); |
3714 | rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc); | |
d166c802 | 3715 | if (rc == 0) { |
96be7b54 ZJ |
3716 | okp = osp->smk_out; |
3717 | skp = ssp->smk_in; | |
138a868f | 3718 | rc = smk_access(okp, skp, MAY_WRITE, &ad); |
21c7eae2 | 3719 | rc = smk_bu_note("UDS connect", okp, skp, |
d166c802 CS |
3720 | MAY_WRITE, rc); |
3721 | } | |
2f823ff8 | 3722 | } |
b4e0d5f0 | 3723 | |
975d5e55 CS |
3724 | /* |
3725 | * Cross reference the peer labels for SO_PEERSEC. | |
3726 | */ | |
3727 | if (rc == 0) { | |
54e70ec5 CS |
3728 | nsp->smk_packet = ssp->smk_out; |
3729 | ssp->smk_packet = osp->smk_out; | |
975d5e55 CS |
3730 | } |
3731 | ||
b4e0d5f0 | 3732 | return rc; |
e114e473 CS |
3733 | } |
3734 | ||
3735 | /** | |
3736 | * smack_unix_may_send - Smack access on UDS | |
3737 | * @sock: one socket | |
3738 | * @other: the other socket | |
3739 | * | |
3740 | * Return 0 if a subject with the smack of sock could access | |
3741 | * an object with the smack of other, otherwise an error code | |
3742 | */ | |
3743 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3744 | { | |
b4e0d5f0 CS |
3745 | struct socket_smack *ssp = sock->sk->sk_security; |
3746 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 3747 | struct smk_audit_info ad; |
d166c802 | 3748 | int rc; |
e114e473 | 3749 | |
923e9a13 KC |
3750 | #ifdef CONFIG_AUDIT |
3751 | struct lsm_network_audit net; | |
3752 | ||
48c62af6 | 3753 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3754 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3755 | #endif |
b4e0d5f0 | 3756 | |
2f823ff8 CS |
3757 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3758 | return 0; | |
b4e0d5f0 | 3759 | |
21c7eae2 LP |
3760 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); |
3761 | rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc); | |
d166c802 | 3762 | return rc; |
e114e473 CS |
3763 | } |
3764 | ||
6d3dc07c CS |
3765 | /** |
3766 | * smack_socket_sendmsg - Smack check based on destination host | |
3767 | * @sock: the socket | |
251a2a95 | 3768 | * @msg: the message |
6d3dc07c CS |
3769 | * @size: the size of the message |
3770 | * | |
c6739443 CS |
3771 | * Return 0 if the current subject can write to the destination host. |
3772 | * For IPv4 this is only a question if the destination is a single label host. | |
3773 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3774 | */ |
3775 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3776 | int size) | |
3777 | { | |
3778 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
21abb1ec | 3779 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3780 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
21abb1ec CS |
3781 | #endif |
3782 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
3783 | struct socket_smack *ssp = sock->sk->sk_security; | |
3784 | struct smack_known *rsp; | |
3785 | #endif | |
c6739443 | 3786 | int rc = 0; |
6d3dc07c CS |
3787 | |
3788 | /* | |
3789 | * Perfectly reasonable for this to be NULL | |
3790 | */ | |
c6739443 | 3791 | if (sip == NULL) |
6d3dc07c CS |
3792 | return 0; |
3793 | ||
81bd0d56 | 3794 | switch (sock->sk->sk_family) { |
c6739443 CS |
3795 | case AF_INET: |
3796 | rc = smack_netlabel_send(sock->sk, sip); | |
3797 | break; | |
3798 | case AF_INET6: | |
21abb1ec CS |
3799 | #ifdef SMACK_IPV6_SECMARK_LABELING |
3800 | rsp = smack_ipv6host_label(sap); | |
3801 | if (rsp != NULL) | |
3802 | rc = smk_ipv6_check(ssp->smk_out, rsp, sap, | |
3803 | SMK_CONNECTING); | |
3804 | #endif | |
3805 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 | 3806 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); |
21abb1ec | 3807 | #endif |
c6739443 CS |
3808 | break; |
3809 | } | |
3810 | return rc; | |
6d3dc07c CS |
3811 | } |
3812 | ||
e114e473 | 3813 | /** |
251a2a95 | 3814 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3815 | * @sap: netlabel secattr |
272cd7a8 | 3816 | * @ssp: socket security information |
e114e473 | 3817 | * |
2f823ff8 | 3818 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3819 | */ |
2f823ff8 CS |
3820 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3821 | struct socket_smack *ssp) | |
e114e473 | 3822 | { |
2f823ff8 | 3823 | struct smack_known *skp; |
f7112e6c | 3824 | int found = 0; |
677264e8 CS |
3825 | int acat; |
3826 | int kcat; | |
e114e473 | 3827 | |
6d3dc07c | 3828 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3829 | /* |
6d3dc07c | 3830 | * Looks like a CIPSO packet. |
e114e473 CS |
3831 | * If there are flags but no level netlabel isn't |
3832 | * behaving the way we expect it to. | |
3833 | * | |
f7112e6c | 3834 | * Look it up in the label table |
e114e473 CS |
3835 | * Without guidance regarding the smack value |
3836 | * for the packet fall back on the network | |
3837 | * ambient value. | |
3838 | */ | |
f7112e6c | 3839 | rcu_read_lock(); |
2f823ff8 CS |
3840 | list_for_each_entry(skp, &smack_known_list, list) { |
3841 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) | |
f7112e6c | 3842 | continue; |
677264e8 CS |
3843 | /* |
3844 | * Compare the catsets. Use the netlbl APIs. | |
3845 | */ | |
3846 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3847 | if ((skp->smk_netlabel.flags & | |
3848 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3849 | found = 1; | |
3850 | break; | |
3851 | } | |
3852 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
4fbe63d1 PM |
3853 | acat = netlbl_catmap_walk(sap->attr.mls.cat, |
3854 | acat + 1); | |
3855 | kcat = netlbl_catmap_walk( | |
677264e8 CS |
3856 | skp->smk_netlabel.attr.mls.cat, |
3857 | kcat + 1); | |
3858 | if (acat < 0 || kcat < 0) | |
3859 | break; | |
3860 | } | |
3861 | if (acat == kcat) { | |
3862 | found = 1; | |
3863 | break; | |
3864 | } | |
6d3dc07c | 3865 | } |
f7112e6c CS |
3866 | rcu_read_unlock(); |
3867 | ||
3868 | if (found) | |
2f823ff8 | 3869 | return skp; |
f7112e6c | 3870 | |
54e70ec5 | 3871 | if (ssp != NULL && ssp->smk_in == &smack_known_star) |
2f823ff8 CS |
3872 | return &smack_known_web; |
3873 | return &smack_known_star; | |
e114e473 | 3874 | } |
6d3dc07c CS |
3875 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
3876 | /* | |
3877 | * Looks like a fallback, which gives us a secid. | |
3878 | */ | |
2f823ff8 | 3879 | skp = smack_from_secid(sap->attr.secid); |
6d3dc07c CS |
3880 | /* |
3881 | * This has got to be a bug because it is | |
3882 | * impossible to specify a fallback without | |
3883 | * specifying the label, which will ensure | |
3884 | * it has a secid, and the only way to get a | |
3885 | * secid is from a fallback. | |
3886 | */ | |
2f823ff8 CS |
3887 | BUG_ON(skp == NULL); |
3888 | return skp; | |
e114e473 CS |
3889 | } |
3890 | /* | |
6d3dc07c CS |
3891 | * Without guidance regarding the smack value |
3892 | * for the packet fall back on the network | |
3893 | * ambient value. | |
e114e473 | 3894 | */ |
272cd7a8 | 3895 | return smack_net_ambient; |
e114e473 CS |
3896 | } |
3897 | ||
69f287ae | 3898 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3899 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3900 | { |
c6739443 CS |
3901 | u8 nexthdr; |
3902 | int offset; | |
3903 | int proto = -EINVAL; | |
3904 | struct ipv6hdr _ipv6h; | |
3905 | struct ipv6hdr *ip6; | |
3906 | __be16 frag_off; | |
3907 | struct tcphdr _tcph, *th; | |
3908 | struct udphdr _udph, *uh; | |
3909 | struct dccp_hdr _dccph, *dh; | |
3910 | ||
3911 | sip->sin6_port = 0; | |
3912 | ||
3913 | offset = skb_network_offset(skb); | |
3914 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3915 | if (ip6 == NULL) | |
3916 | return -EINVAL; | |
3917 | sip->sin6_addr = ip6->saddr; | |
3918 | ||
3919 | nexthdr = ip6->nexthdr; | |
3920 | offset += sizeof(_ipv6h); | |
3921 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3922 | if (offset < 0) | |
3923 | return -EINVAL; | |
3924 | ||
3925 | proto = nexthdr; | |
3926 | switch (proto) { | |
3927 | case IPPROTO_TCP: | |
3928 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3929 | if (th != NULL) | |
3930 | sip->sin6_port = th->source; | |
3931 | break; | |
3932 | case IPPROTO_UDP: | |
3933 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); | |
3934 | if (uh != NULL) | |
3935 | sip->sin6_port = uh->source; | |
3936 | break; | |
3937 | case IPPROTO_DCCP: | |
3938 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3939 | if (dh != NULL) | |
3940 | sip->sin6_port = dh->dccph_sport; | |
3941 | break; | |
3942 | } | |
3943 | return proto; | |
3944 | } | |
69f287ae | 3945 | #endif /* CONFIG_IPV6 */ |
c6739443 | 3946 | |
e114e473 CS |
3947 | /** |
3948 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3949 | * @sk: socket | |
3950 | * @skb: packet | |
3951 | * | |
3952 | * Returns 0 if the packet should be delivered, an error code otherwise | |
3953 | */ | |
3954 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
3955 | { | |
3956 | struct netlbl_lsm_secattr secattr; | |
3957 | struct socket_smack *ssp = sk->sk_security; | |
69f287ae | 3958 | struct smack_known *skp = NULL; |
c6739443 | 3959 | int rc = 0; |
ecfcc53f | 3960 | struct smk_audit_info ad; |
923e9a13 | 3961 | #ifdef CONFIG_AUDIT |
48c62af6 | 3962 | struct lsm_network_audit net; |
923e9a13 | 3963 | #endif |
69f287ae CS |
3964 | #if IS_ENABLED(CONFIG_IPV6) |
3965 | struct sockaddr_in6 sadd; | |
3966 | int proto; | |
3967 | #endif /* CONFIG_IPV6 */ | |
3968 | ||
c6739443 CS |
3969 | switch (sk->sk_family) { |
3970 | case PF_INET: | |
69f287ae CS |
3971 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3972 | /* | |
3973 | * If there is a secmark use it rather than the CIPSO label. | |
3974 | * If there is no secmark fall back to CIPSO. | |
3975 | * The secmark is assumed to reflect policy better. | |
3976 | */ | |
3977 | if (skb && skb->secmark != 0) { | |
3978 | skp = smack_from_secid(skb->secmark); | |
3979 | goto access_check; | |
3980 | } | |
3981 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
c6739443 CS |
3982 | /* |
3983 | * Translate what netlabel gave us. | |
3984 | */ | |
3985 | netlbl_secattr_init(&secattr); | |
6d3dc07c | 3986 | |
c6739443 CS |
3987 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
3988 | if (rc == 0) | |
2f823ff8 | 3989 | skp = smack_from_secattr(&secattr, ssp); |
c6739443 | 3990 | else |
2f823ff8 | 3991 | skp = smack_net_ambient; |
6d3dc07c | 3992 | |
c6739443 | 3993 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3994 | |
69f287ae CS |
3995 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3996 | access_check: | |
3997 | #endif | |
ecfcc53f | 3998 | #ifdef CONFIG_AUDIT |
c6739443 CS |
3999 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
4000 | ad.a.u.net->family = sk->sk_family; | |
4001 | ad.a.u.net->netif = skb->skb_iif; | |
4002 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 4003 | #endif |
c6739443 CS |
4004 | /* |
4005 | * Receiving a packet requires that the other end | |
4006 | * be able to write here. Read access is not required. | |
4007 | * This is the simplist possible security model | |
4008 | * for networking. | |
4009 | */ | |
21c7eae2 LP |
4010 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
4011 | rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in, | |
d166c802 | 4012 | MAY_WRITE, rc); |
c6739443 CS |
4013 | if (rc != 0) |
4014 | netlbl_skbuff_err(skb, rc, 0); | |
4015 | break; | |
69f287ae | 4016 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 | 4017 | case PF_INET6: |
69f287ae CS |
4018 | proto = smk_skb_to_addr_ipv6(skb, &sadd); |
4019 | if (proto != IPPROTO_UDP && proto != IPPROTO_TCP) | |
4020 | break; | |
21abb1ec | 4021 | #ifdef SMACK_IPV6_SECMARK_LABELING |
69f287ae CS |
4022 | if (skb && skb->secmark != 0) |
4023 | skp = smack_from_secid(skb->secmark); | |
c6739443 | 4024 | else |
21abb1ec CS |
4025 | skp = smack_ipv6host_label(&sadd); |
4026 | if (skp == NULL) | |
69f287ae CS |
4027 | skp = smack_net_ambient; |
4028 | #ifdef CONFIG_AUDIT | |
4029 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
4030 | ad.a.u.net->family = sk->sk_family; | |
4031 | ad.a.u.net->netif = skb->skb_iif; | |
4032 | ipv6_skb_to_auditdata(skb, &ad.a, NULL); | |
4033 | #endif /* CONFIG_AUDIT */ | |
4034 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); | |
4035 | rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in, | |
4036 | MAY_WRITE, rc); | |
21abb1ec CS |
4037 | #endif /* SMACK_IPV6_SECMARK_LABELING */ |
4038 | #ifdef SMACK_IPV6_PORT_LABELING | |
69f287ae | 4039 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); |
21abb1ec | 4040 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 4041 | break; |
69f287ae | 4042 | #endif /* CONFIG_IPV6 */ |
c6739443 | 4043 | } |
69f287ae | 4044 | |
a8134296 | 4045 | return rc; |
e114e473 CS |
4046 | } |
4047 | ||
4048 | /** | |
4049 | * smack_socket_getpeersec_stream - pull in packet label | |
4050 | * @sock: the socket | |
4051 | * @optval: user's destination | |
4052 | * @optlen: size thereof | |
251a2a95 | 4053 | * @len: max thereof |
e114e473 CS |
4054 | * |
4055 | * returns zero on success, an error code otherwise | |
4056 | */ | |
4057 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
4058 | char __user *optval, | |
4059 | int __user *optlen, unsigned len) | |
4060 | { | |
4061 | struct socket_smack *ssp; | |
272cd7a8 CS |
4062 | char *rcp = ""; |
4063 | int slen = 1; | |
e114e473 CS |
4064 | int rc = 0; |
4065 | ||
4066 | ssp = sock->sk->sk_security; | |
272cd7a8 | 4067 | if (ssp->smk_packet != NULL) { |
54e70ec5 | 4068 | rcp = ssp->smk_packet->smk_known; |
272cd7a8 CS |
4069 | slen = strlen(rcp) + 1; |
4070 | } | |
e114e473 CS |
4071 | |
4072 | if (slen > len) | |
4073 | rc = -ERANGE; | |
272cd7a8 | 4074 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
4075 | rc = -EFAULT; |
4076 | ||
4077 | if (put_user(slen, optlen) != 0) | |
4078 | rc = -EFAULT; | |
4079 | ||
4080 | return rc; | |
4081 | } | |
4082 | ||
4083 | ||
4084 | /** | |
4085 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 4086 | * @sock: the peer socket |
e114e473 CS |
4087 | * @skb: packet data |
4088 | * @secid: pointer to where to put the secid of the packet | |
4089 | * | |
4090 | * Sets the netlabel socket state on sk from parent | |
4091 | */ | |
4092 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
4093 | struct sk_buff *skb, u32 *secid) | |
4094 | ||
4095 | { | |
4096 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 | 4097 | struct socket_smack *ssp = NULL; |
2f823ff8 | 4098 | struct smack_known *skp; |
b4e0d5f0 CS |
4099 | int family = PF_UNSPEC; |
4100 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
4101 | int rc; |
4102 | ||
b4e0d5f0 CS |
4103 | if (skb != NULL) { |
4104 | if (skb->protocol == htons(ETH_P_IP)) | |
4105 | family = PF_INET; | |
69f287ae | 4106 | #if IS_ENABLED(CONFIG_IPV6) |
b4e0d5f0 CS |
4107 | else if (skb->protocol == htons(ETH_P_IPV6)) |
4108 | family = PF_INET6; | |
69f287ae | 4109 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4110 | } |
b4e0d5f0 CS |
4111 | if (family == PF_UNSPEC && sock != NULL) |
4112 | family = sock->sk->sk_family; | |
e114e473 | 4113 | |
69f287ae CS |
4114 | switch (family) { |
4115 | case PF_UNIX: | |
272cd7a8 | 4116 | ssp = sock->sk->sk_security; |
2f823ff8 | 4117 | s = ssp->smk_out->smk_secid; |
69f287ae CS |
4118 | break; |
4119 | case PF_INET: | |
4120 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4121 | s = skb->secmark; | |
4122 | if (s != 0) | |
4123 | break; | |
4124 | #endif | |
b4e0d5f0 CS |
4125 | /* |
4126 | * Translate what netlabel gave us. | |
4127 | */ | |
272cd7a8 CS |
4128 | if (sock != NULL && sock->sk != NULL) |
4129 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
4130 | netlbl_secattr_init(&secattr); |
4131 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
4132 | if (rc == 0) { | |
2f823ff8 CS |
4133 | skp = smack_from_secattr(&secattr, ssp); |
4134 | s = skp->smk_secid; | |
b4e0d5f0 CS |
4135 | } |
4136 | netlbl_secattr_destroy(&secattr); | |
69f287ae | 4137 | break; |
69f287ae | 4138 | case PF_INET6: |
21abb1ec | 4139 | #ifdef SMACK_IPV6_SECMARK_LABELING |
69f287ae | 4140 | s = skb->secmark; |
21abb1ec | 4141 | #endif |
69f287ae | 4142 | break; |
b4e0d5f0 CS |
4143 | } |
4144 | *secid = s; | |
e114e473 CS |
4145 | if (s == 0) |
4146 | return -EINVAL; | |
e114e473 CS |
4147 | return 0; |
4148 | } | |
4149 | ||
4150 | /** | |
07feee8f PM |
4151 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
4152 | * @sk: child sock | |
4153 | * @parent: parent socket | |
e114e473 | 4154 | * |
07feee8f PM |
4155 | * Set the smk_{in,out} state of an existing sock based on the process that |
4156 | * is creating the new socket. | |
e114e473 CS |
4157 | */ |
4158 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
4159 | { | |
4160 | struct socket_smack *ssp; | |
2f823ff8 | 4161 | struct smack_known *skp = smk_of_current(); |
e114e473 | 4162 | |
07feee8f PM |
4163 | if (sk == NULL || |
4164 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
4165 | return; |
4166 | ||
4167 | ssp = sk->sk_security; | |
54e70ec5 | 4168 | ssp->smk_in = skp; |
2f823ff8 | 4169 | ssp->smk_out = skp; |
07feee8f | 4170 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
4171 | } |
4172 | ||
4173 | /** | |
4174 | * smack_inet_conn_request - Smack access check on connect | |
4175 | * @sk: socket involved | |
4176 | * @skb: packet | |
4177 | * @req: unused | |
4178 | * | |
4179 | * Returns 0 if a task with the packet label could write to | |
4180 | * the socket, otherwise an error code | |
4181 | */ | |
4182 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
4183 | struct request_sock *req) | |
4184 | { | |
07feee8f | 4185 | u16 family = sk->sk_family; |
f7112e6c | 4186 | struct smack_known *skp; |
e114e473 | 4187 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
4188 | struct netlbl_lsm_secattr secattr; |
4189 | struct sockaddr_in addr; | |
4190 | struct iphdr *hdr; | |
21c7eae2 | 4191 | struct smack_known *hskp; |
e114e473 | 4192 | int rc; |
ecfcc53f | 4193 | struct smk_audit_info ad; |
923e9a13 | 4194 | #ifdef CONFIG_AUDIT |
48c62af6 | 4195 | struct lsm_network_audit net; |
923e9a13 | 4196 | #endif |
e114e473 | 4197 | |
69f287ae | 4198 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 CS |
4199 | if (family == PF_INET6) { |
4200 | /* | |
4201 | * Handle mapped IPv4 packets arriving | |
4202 | * via IPv6 sockets. Don't set up netlabel | |
4203 | * processing on IPv6. | |
4204 | */ | |
4205 | if (skb->protocol == htons(ETH_P_IP)) | |
4206 | family = PF_INET; | |
4207 | else | |
4208 | return 0; | |
4209 | } | |
69f287ae | 4210 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4211 | |
7f368ad3 CS |
4212 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4213 | /* | |
4214 | * If there is a secmark use it rather than the CIPSO label. | |
4215 | * If there is no secmark fall back to CIPSO. | |
4216 | * The secmark is assumed to reflect policy better. | |
4217 | */ | |
4218 | if (skb && skb->secmark != 0) { | |
4219 | skp = smack_from_secid(skb->secmark); | |
4220 | goto access_check; | |
4221 | } | |
4222 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
4223 | ||
07feee8f PM |
4224 | netlbl_secattr_init(&secattr); |
4225 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 4226 | if (rc == 0) |
2f823ff8 | 4227 | skp = smack_from_secattr(&secattr, ssp); |
e114e473 | 4228 | else |
2f823ff8 | 4229 | skp = &smack_known_huh; |
07feee8f PM |
4230 | netlbl_secattr_destroy(&secattr); |
4231 | ||
7f368ad3 CS |
4232 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4233 | access_check: | |
4234 | #endif | |
4235 | ||
ecfcc53f | 4236 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
4237 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
4238 | ad.a.u.net->family = family; | |
4239 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
4240 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
4241 | #endif | |
e114e473 | 4242 | /* |
07feee8f PM |
4243 | * Receiving a packet requires that the other end be able to write |
4244 | * here. Read access is not required. | |
e114e473 | 4245 | */ |
21c7eae2 LP |
4246 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
4247 | rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc); | |
07feee8f PM |
4248 | if (rc != 0) |
4249 | return rc; | |
4250 | ||
4251 | /* | |
4252 | * Save the peer's label in the request_sock so we can later setup | |
4253 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
4254 | */ | |
2f823ff8 | 4255 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
4256 | |
4257 | /* | |
4258 | * We need to decide if we want to label the incoming connection here | |
4259 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 4260 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
4261 | */ |
4262 | hdr = ip_hdr(skb); | |
4263 | addr.sin_addr.s_addr = hdr->saddr; | |
4264 | rcu_read_lock(); | |
21abb1ec | 4265 | hskp = smack_ipv4host_label(&addr); |
f7112e6c CS |
4266 | rcu_read_unlock(); |
4267 | ||
21c7eae2 | 4268 | if (hskp == NULL) |
f7112e6c | 4269 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 4270 | else |
07feee8f | 4271 | netlbl_req_delattr(req); |
e114e473 CS |
4272 | |
4273 | return rc; | |
4274 | } | |
4275 | ||
07feee8f PM |
4276 | /** |
4277 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
4278 | * @sk: the new socket | |
4279 | * @req: the connection's request_sock | |
4280 | * | |
4281 | * Transfer the connection's peer label to the newly created socket. | |
4282 | */ | |
4283 | static void smack_inet_csk_clone(struct sock *sk, | |
4284 | const struct request_sock *req) | |
4285 | { | |
4286 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 4287 | struct smack_known *skp; |
07feee8f | 4288 | |
2f823ff8 CS |
4289 | if (req->peer_secid != 0) { |
4290 | skp = smack_from_secid(req->peer_secid); | |
54e70ec5 | 4291 | ssp->smk_packet = skp; |
2f823ff8 | 4292 | } else |
272cd7a8 | 4293 | ssp->smk_packet = NULL; |
07feee8f PM |
4294 | } |
4295 | ||
e114e473 CS |
4296 | /* |
4297 | * Key management security hooks | |
4298 | * | |
4299 | * Casey has not tested key support very heavily. | |
4300 | * The permission check is most likely too restrictive. | |
4301 | * If you care about keys please have a look. | |
4302 | */ | |
4303 | #ifdef CONFIG_KEYS | |
4304 | ||
4305 | /** | |
4306 | * smack_key_alloc - Set the key security blob | |
4307 | * @key: object | |
d84f4f99 | 4308 | * @cred: the credentials to use |
e114e473 CS |
4309 | * @flags: unused |
4310 | * | |
4311 | * No allocation required | |
4312 | * | |
4313 | * Returns 0 | |
4314 | */ | |
d84f4f99 | 4315 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
4316 | unsigned long flags) |
4317 | { | |
2f823ff8 CS |
4318 | struct smack_known *skp = smk_of_task(cred->security); |
4319 | ||
21c7eae2 | 4320 | key->security = skp; |
e114e473 CS |
4321 | return 0; |
4322 | } | |
4323 | ||
4324 | /** | |
4325 | * smack_key_free - Clear the key security blob | |
4326 | * @key: the object | |
4327 | * | |
4328 | * Clear the blob pointer | |
4329 | */ | |
4330 | static void smack_key_free(struct key *key) | |
4331 | { | |
4332 | key->security = NULL; | |
4333 | } | |
4334 | ||
1a28979b | 4335 | /** |
e114e473 CS |
4336 | * smack_key_permission - Smack access on a key |
4337 | * @key_ref: gets to the object | |
d84f4f99 | 4338 | * @cred: the credentials to use |
1a28979b | 4339 | * @perm: requested key permissions |
e114e473 CS |
4340 | * |
4341 | * Return 0 if the task has read and write to the object, | |
4342 | * an error code otherwise | |
4343 | */ | |
4344 | static int smack_key_permission(key_ref_t key_ref, | |
f5895943 | 4345 | const struct cred *cred, unsigned perm) |
e114e473 CS |
4346 | { |
4347 | struct key *keyp; | |
ecfcc53f | 4348 | struct smk_audit_info ad; |
2f823ff8 | 4349 | struct smack_known *tkp = smk_of_task(cred->security); |
fffea214 | 4350 | int request = 0; |
d166c802 | 4351 | int rc; |
e114e473 CS |
4352 | |
4353 | keyp = key_ref_to_ptr(key_ref); | |
4354 | if (keyp == NULL) | |
4355 | return -EINVAL; | |
4356 | /* | |
4357 | * If the key hasn't been initialized give it access so that | |
4358 | * it may do so. | |
4359 | */ | |
4360 | if (keyp->security == NULL) | |
4361 | return 0; | |
4362 | /* | |
4363 | * This should not occur | |
4364 | */ | |
2f823ff8 | 4365 | if (tkp == NULL) |
e114e473 | 4366 | return -EACCES; |
ecfcc53f EB |
4367 | #ifdef CONFIG_AUDIT |
4368 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
4369 | ad.a.u.key_struct.key = keyp->serial; | |
4370 | ad.a.u.key_struct.key_desc = keyp->description; | |
4371 | #endif | |
fffea214 DK |
4372 | if (perm & KEY_NEED_READ) |
4373 | request = MAY_READ; | |
4374 | if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR)) | |
4375 | request = MAY_WRITE; | |
d166c802 CS |
4376 | rc = smk_access(tkp, keyp->security, request, &ad); |
4377 | rc = smk_bu_note("key access", tkp, keyp->security, request, rc); | |
4378 | return rc; | |
e114e473 | 4379 | } |
7fc5f36e JB |
4380 | |
4381 | /* | |
4382 | * smack_key_getsecurity - Smack label tagging the key | |
4383 | * @key points to the key to be queried | |
4384 | * @_buffer points to a pointer that should be set to point to the | |
4385 | * resulting string (if no label or an error occurs). | |
4386 | * Return the length of the string (including terminating NUL) or -ve if | |
4387 | * an error. | |
4388 | * May also return 0 (and a NULL buffer pointer) if there is no label. | |
4389 | */ | |
4390 | static int smack_key_getsecurity(struct key *key, char **_buffer) | |
4391 | { | |
4392 | struct smack_known *skp = key->security; | |
4393 | size_t length; | |
4394 | char *copy; | |
4395 | ||
4396 | if (key->security == NULL) { | |
4397 | *_buffer = NULL; | |
4398 | return 0; | |
4399 | } | |
4400 | ||
4401 | copy = kstrdup(skp->smk_known, GFP_KERNEL); | |
4402 | if (copy == NULL) | |
4403 | return -ENOMEM; | |
4404 | length = strlen(copy) + 1; | |
4405 | ||
4406 | *_buffer = copy; | |
4407 | return length; | |
4408 | } | |
4409 | ||
e114e473 CS |
4410 | #endif /* CONFIG_KEYS */ |
4411 | ||
d20bdda6 AD |
4412 | /* |
4413 | * Smack Audit hooks | |
4414 | * | |
4415 | * Audit requires a unique representation of each Smack specific | |
4416 | * rule. This unique representation is used to distinguish the | |
4417 | * object to be audited from remaining kernel objects and also | |
4418 | * works as a glue between the audit hooks. | |
4419 | * | |
4420 | * Since repository entries are added but never deleted, we'll use | |
4421 | * the smack_known label address related to the given audit rule as | |
4422 | * the needed unique representation. This also better fits the smack | |
4423 | * model where nearly everything is a label. | |
4424 | */ | |
4425 | #ifdef CONFIG_AUDIT | |
4426 | ||
4427 | /** | |
4428 | * smack_audit_rule_init - Initialize a smack audit rule | |
4429 | * @field: audit rule fields given from user-space (audit.h) | |
4430 | * @op: required testing operator (=, !=, >, <, ...) | |
4431 | * @rulestr: smack label to be audited | |
4432 | * @vrule: pointer to save our own audit rule representation | |
4433 | * | |
4434 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
4435 | * The label to be audited is created if necessay. | |
4436 | */ | |
4437 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
4438 | { | |
21c7eae2 | 4439 | struct smack_known *skp; |
d20bdda6 AD |
4440 | char **rule = (char **)vrule; |
4441 | *rule = NULL; | |
4442 | ||
4443 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4444 | return -EINVAL; | |
4445 | ||
5af75d8d | 4446 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
4447 | return -EINVAL; |
4448 | ||
21c7eae2 | 4449 | skp = smk_import_entry(rulestr, 0); |
e774ad68 LP |
4450 | if (IS_ERR(skp)) |
4451 | return PTR_ERR(skp); | |
4452 | ||
4453 | *rule = skp->smk_known; | |
d20bdda6 AD |
4454 | |
4455 | return 0; | |
4456 | } | |
4457 | ||
4458 | /** | |
4459 | * smack_audit_rule_known - Distinguish Smack audit rules | |
4460 | * @krule: rule of interest, in Audit kernel representation format | |
4461 | * | |
4462 | * This is used to filter Smack rules from remaining Audit ones. | |
4463 | * If it's proved that this rule belongs to us, the | |
4464 | * audit_rule_match hook will be called to do the final judgement. | |
4465 | */ | |
4466 | static int smack_audit_rule_known(struct audit_krule *krule) | |
4467 | { | |
4468 | struct audit_field *f; | |
4469 | int i; | |
4470 | ||
4471 | for (i = 0; i < krule->field_count; i++) { | |
4472 | f = &krule->fields[i]; | |
4473 | ||
4474 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
4475 | return 1; | |
4476 | } | |
4477 | ||
4478 | return 0; | |
4479 | } | |
4480 | ||
4481 | /** | |
4482 | * smack_audit_rule_match - Audit given object ? | |
4483 | * @secid: security id for identifying the object to test | |
4484 | * @field: audit rule flags given from user-space | |
4485 | * @op: required testing operator | |
4486 | * @vrule: smack internal rule presentation | |
4487 | * @actx: audit context associated with the check | |
4488 | * | |
4489 | * The core Audit hook. It's used to take the decision of | |
4490 | * whether to audit or not to audit a given object. | |
4491 | */ | |
4492 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
4493 | struct audit_context *actx) | |
4494 | { | |
2f823ff8 | 4495 | struct smack_known *skp; |
d20bdda6 AD |
4496 | char *rule = vrule; |
4497 | ||
4eb0f4ab RGB |
4498 | if (unlikely(!rule)) { |
4499 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
4500 | return -ENOENT; |
4501 | } | |
4502 | ||
4503 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4504 | return 0; | |
4505 | ||
2f823ff8 | 4506 | skp = smack_from_secid(secid); |
d20bdda6 AD |
4507 | |
4508 | /* | |
4509 | * No need to do string comparisons. If a match occurs, | |
4510 | * both pointers will point to the same smack_known | |
4511 | * label. | |
4512 | */ | |
5af75d8d | 4513 | if (op == Audit_equal) |
2f823ff8 | 4514 | return (rule == skp->smk_known); |
5af75d8d | 4515 | if (op == Audit_not_equal) |
2f823ff8 | 4516 | return (rule != skp->smk_known); |
d20bdda6 AD |
4517 | |
4518 | return 0; | |
4519 | } | |
4520 | ||
491a0b08 CS |
4521 | /* |
4522 | * There is no need for a smack_audit_rule_free hook. | |
d20bdda6 AD |
4523 | * No memory was allocated. |
4524 | */ | |
d20bdda6 AD |
4525 | |
4526 | #endif /* CONFIG_AUDIT */ | |
4527 | ||
746df9b5 DQ |
4528 | /** |
4529 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
4530 | * @name: Full xattr name to check. | |
4531 | */ | |
4532 | static int smack_ismaclabel(const char *name) | |
4533 | { | |
4534 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
4535 | } | |
4536 | ||
4537 | ||
251a2a95 | 4538 | /** |
e114e473 CS |
4539 | * smack_secid_to_secctx - return the smack label for a secid |
4540 | * @secid: incoming integer | |
4541 | * @secdata: destination | |
4542 | * @seclen: how long it is | |
4543 | * | |
4544 | * Exists for networking code. | |
4545 | */ | |
4546 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
4547 | { | |
2f823ff8 | 4548 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 4549 | |
d5630b9d | 4550 | if (secdata) |
2f823ff8 CS |
4551 | *secdata = skp->smk_known; |
4552 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
4553 | return 0; |
4554 | } | |
4555 | ||
251a2a95 | 4556 | /** |
4bc87e62 CS |
4557 | * smack_secctx_to_secid - return the secid for a smack label |
4558 | * @secdata: smack label | |
4559 | * @seclen: how long result is | |
4560 | * @secid: outgoing integer | |
4561 | * | |
4562 | * Exists for audit and networking code. | |
4563 | */ | |
e52c1764 | 4564 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 | 4565 | { |
21c7eae2 LP |
4566 | struct smack_known *skp = smk_find_entry(secdata); |
4567 | ||
4568 | if (skp) | |
4569 | *secid = skp->smk_secid; | |
4570 | else | |
4571 | *secid = 0; | |
4bc87e62 CS |
4572 | return 0; |
4573 | } | |
4574 | ||
491a0b08 CS |
4575 | /* |
4576 | * There used to be a smack_release_secctx hook | |
4577 | * that did nothing back when hooks were in a vector. | |
4578 | * Now that there's a list such a hook adds cost. | |
e114e473 | 4579 | */ |
e114e473 | 4580 | |
1ee65e37 DQ |
4581 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
4582 | { | |
4583 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
4584 | } | |
4585 | ||
4586 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
4587 | { | |
4588 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
4589 | } | |
4590 | ||
4591 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
4592 | { | |
4593 | int len = 0; | |
4594 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
4595 | ||
4596 | if (len < 0) | |
4597 | return len; | |
4598 | *ctxlen = len; | |
4599 | return 0; | |
4600 | } | |
4601 | ||
1eddfe8e | 4602 | static struct security_hook_list smack_hooks[] = { |
e20b043a CS |
4603 | LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check), |
4604 | LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme), | |
4605 | LSM_HOOK_INIT(syslog, smack_syslog), | |
4606 | ||
4607 | LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security), | |
4608 | LSM_HOOK_INIT(sb_free_security, smack_sb_free_security), | |
4609 | LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data), | |
4610 | LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount), | |
4611 | LSM_HOOK_INIT(sb_statfs, smack_sb_statfs), | |
3bf2789c VT |
4612 | LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts), |
4613 | LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str), | |
e20b043a CS |
4614 | |
4615 | LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds), | |
4616 | LSM_HOOK_INIT(bprm_committing_creds, smack_bprm_committing_creds), | |
4617 | LSM_HOOK_INIT(bprm_secureexec, smack_bprm_secureexec), | |
4618 | ||
4619 | LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security), | |
4620 | LSM_HOOK_INIT(inode_free_security, smack_inode_free_security), | |
4621 | LSM_HOOK_INIT(inode_init_security, smack_inode_init_security), | |
4622 | LSM_HOOK_INIT(inode_link, smack_inode_link), | |
4623 | LSM_HOOK_INIT(inode_unlink, smack_inode_unlink), | |
4624 | LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir), | |
4625 | LSM_HOOK_INIT(inode_rename, smack_inode_rename), | |
4626 | LSM_HOOK_INIT(inode_permission, smack_inode_permission), | |
4627 | LSM_HOOK_INIT(inode_setattr, smack_inode_setattr), | |
4628 | LSM_HOOK_INIT(inode_getattr, smack_inode_getattr), | |
4629 | LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr), | |
4630 | LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr), | |
4631 | LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr), | |
4632 | LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr), | |
4633 | LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity), | |
4634 | LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity), | |
4635 | LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity), | |
4636 | LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid), | |
4637 | ||
e20b043a CS |
4638 | LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security), |
4639 | LSM_HOOK_INIT(file_free_security, smack_file_free_security), | |
4640 | LSM_HOOK_INIT(file_ioctl, smack_file_ioctl), | |
4641 | LSM_HOOK_INIT(file_lock, smack_file_lock), | |
4642 | LSM_HOOK_INIT(file_fcntl, smack_file_fcntl), | |
4643 | LSM_HOOK_INIT(mmap_file, smack_mmap_file), | |
4644 | LSM_HOOK_INIT(mmap_addr, cap_mmap_addr), | |
4645 | LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner), | |
4646 | LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask), | |
4647 | LSM_HOOK_INIT(file_receive, smack_file_receive), | |
4648 | ||
4649 | LSM_HOOK_INIT(file_open, smack_file_open), | |
4650 | ||
4651 | LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank), | |
4652 | LSM_HOOK_INIT(cred_free, smack_cred_free), | |
4653 | LSM_HOOK_INIT(cred_prepare, smack_cred_prepare), | |
4654 | LSM_HOOK_INIT(cred_transfer, smack_cred_transfer), | |
4655 | LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as), | |
4656 | LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as), | |
4657 | LSM_HOOK_INIT(task_setpgid, smack_task_setpgid), | |
4658 | LSM_HOOK_INIT(task_getpgid, smack_task_getpgid), | |
4659 | LSM_HOOK_INIT(task_getsid, smack_task_getsid), | |
4660 | LSM_HOOK_INIT(task_getsecid, smack_task_getsecid), | |
4661 | LSM_HOOK_INIT(task_setnice, smack_task_setnice), | |
4662 | LSM_HOOK_INIT(task_setioprio, smack_task_setioprio), | |
4663 | LSM_HOOK_INIT(task_getioprio, smack_task_getioprio), | |
4664 | LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler), | |
4665 | LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler), | |
4666 | LSM_HOOK_INIT(task_movememory, smack_task_movememory), | |
4667 | LSM_HOOK_INIT(task_kill, smack_task_kill), | |
4668 | LSM_HOOK_INIT(task_wait, smack_task_wait), | |
4669 | LSM_HOOK_INIT(task_to_inode, smack_task_to_inode), | |
4670 | ||
4671 | LSM_HOOK_INIT(ipc_permission, smack_ipc_permission), | |
4672 | LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid), | |
4673 | ||
4674 | LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security), | |
4675 | LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security), | |
4676 | ||
4677 | LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security), | |
4678 | LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security), | |
4679 | LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate), | |
4680 | LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl), | |
4681 | LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd), | |
4682 | LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv), | |
4683 | ||
4684 | LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security), | |
4685 | LSM_HOOK_INIT(shm_free_security, smack_shm_free_security), | |
4686 | LSM_HOOK_INIT(shm_associate, smack_shm_associate), | |
4687 | LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl), | |
4688 | LSM_HOOK_INIT(shm_shmat, smack_shm_shmat), | |
4689 | ||
4690 | LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security), | |
4691 | LSM_HOOK_INIT(sem_free_security, smack_sem_free_security), | |
4692 | LSM_HOOK_INIT(sem_associate, smack_sem_associate), | |
4693 | LSM_HOOK_INIT(sem_semctl, smack_sem_semctl), | |
4694 | LSM_HOOK_INIT(sem_semop, smack_sem_semop), | |
4695 | ||
4696 | LSM_HOOK_INIT(d_instantiate, smack_d_instantiate), | |
4697 | ||
4698 | LSM_HOOK_INIT(getprocattr, smack_getprocattr), | |
4699 | LSM_HOOK_INIT(setprocattr, smack_setprocattr), | |
4700 | ||
4701 | LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect), | |
4702 | LSM_HOOK_INIT(unix_may_send, smack_unix_may_send), | |
4703 | ||
4704 | LSM_HOOK_INIT(socket_post_create, smack_socket_post_create), | |
21abb1ec | 4705 | #ifdef SMACK_IPV6_PORT_LABELING |
e20b043a | 4706 | LSM_HOOK_INIT(socket_bind, smack_socket_bind), |
21abb1ec | 4707 | #endif |
e20b043a CS |
4708 | LSM_HOOK_INIT(socket_connect, smack_socket_connect), |
4709 | LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg), | |
4710 | LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb), | |
4711 | LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream), | |
4712 | LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram), | |
4713 | LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security), | |
4714 | LSM_HOOK_INIT(sk_free_security, smack_sk_free_security), | |
4715 | LSM_HOOK_INIT(sock_graft, smack_sock_graft), | |
4716 | LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request), | |
4717 | LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone), | |
d20bdda6 | 4718 | |
e114e473 CS |
4719 | /* key management security hooks */ |
4720 | #ifdef CONFIG_KEYS | |
e20b043a CS |
4721 | LSM_HOOK_INIT(key_alloc, smack_key_alloc), |
4722 | LSM_HOOK_INIT(key_free, smack_key_free), | |
4723 | LSM_HOOK_INIT(key_permission, smack_key_permission), | |
4724 | LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity), | |
e114e473 | 4725 | #endif /* CONFIG_KEYS */ |
d20bdda6 AD |
4726 | |
4727 | /* Audit hooks */ | |
4728 | #ifdef CONFIG_AUDIT | |
e20b043a CS |
4729 | LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init), |
4730 | LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known), | |
4731 | LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match), | |
d20bdda6 AD |
4732 | #endif /* CONFIG_AUDIT */ |
4733 | ||
e20b043a CS |
4734 | LSM_HOOK_INIT(ismaclabel, smack_ismaclabel), |
4735 | LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx), | |
4736 | LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid), | |
e20b043a CS |
4737 | LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx), |
4738 | LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx), | |
4739 | LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx), | |
e114e473 CS |
4740 | }; |
4741 | ||
7198e2ee | 4742 | |
86812bb0 | 4743 | static __init void init_smack_known_list(void) |
7198e2ee | 4744 | { |
86812bb0 CS |
4745 | /* |
4746 | * Initialize rule list locks | |
4747 | */ | |
4748 | mutex_init(&smack_known_huh.smk_rules_lock); | |
4749 | mutex_init(&smack_known_hat.smk_rules_lock); | |
4750 | mutex_init(&smack_known_floor.smk_rules_lock); | |
4751 | mutex_init(&smack_known_star.smk_rules_lock); | |
4752 | mutex_init(&smack_known_invalid.smk_rules_lock); | |
4753 | mutex_init(&smack_known_web.smk_rules_lock); | |
4754 | /* | |
4755 | * Initialize rule lists | |
4756 | */ | |
4757 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
4758 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
4759 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
4760 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
4761 | INIT_LIST_HEAD(&smack_known_invalid.smk_rules); | |
4762 | INIT_LIST_HEAD(&smack_known_web.smk_rules); | |
4763 | /* | |
4764 | * Create the known labels list | |
4765 | */ | |
4d7cf4a1 TS |
4766 | smk_insert_entry(&smack_known_huh); |
4767 | smk_insert_entry(&smack_known_hat); | |
4768 | smk_insert_entry(&smack_known_star); | |
4769 | smk_insert_entry(&smack_known_floor); | |
4770 | smk_insert_entry(&smack_known_invalid); | |
4771 | smk_insert_entry(&smack_known_web); | |
7198e2ee EB |
4772 | } |
4773 | ||
e114e473 CS |
4774 | /** |
4775 | * smack_init - initialize the smack system | |
4776 | * | |
4777 | * Returns 0 | |
4778 | */ | |
4779 | static __init int smack_init(void) | |
4780 | { | |
d84f4f99 | 4781 | struct cred *cred; |
676dac4b | 4782 | struct task_smack *tsp; |
d84f4f99 | 4783 | |
b1d9e6b0 | 4784 | if (!security_module_enable("smack")) |
7898e1f8 CS |
4785 | return 0; |
4786 | ||
1a5b472b R |
4787 | smack_inode_cache = KMEM_CACHE(inode_smack, 0); |
4788 | if (!smack_inode_cache) | |
4789 | return -ENOMEM; | |
4790 | ||
2f823ff8 CS |
4791 | tsp = new_task_smack(&smack_known_floor, &smack_known_floor, |
4792 | GFP_KERNEL); | |
1a5b472b R |
4793 | if (tsp == NULL) { |
4794 | kmem_cache_destroy(smack_inode_cache); | |
676dac4b | 4795 | return -ENOMEM; |
1a5b472b | 4796 | } |
676dac4b | 4797 | |
d21b7b04 JB |
4798 | smack_enabled = 1; |
4799 | ||
21abb1ec CS |
4800 | pr_info("Smack: Initializing.\n"); |
4801 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4802 | pr_info("Smack: Netfilter enabled.\n"); | |
4803 | #endif | |
4804 | #ifdef SMACK_IPV6_PORT_LABELING | |
4805 | pr_info("Smack: IPv6 port labeling enabled.\n"); | |
4806 | #endif | |
4807 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
4808 | pr_info("Smack: IPv6 Netfilter enabled.\n"); | |
4809 | #endif | |
e114e473 CS |
4810 | |
4811 | /* | |
4812 | * Set the security state for the initial task. | |
4813 | */ | |
d84f4f99 | 4814 | cred = (struct cred *) current->cred; |
676dac4b | 4815 | cred->security = tsp; |
e114e473 | 4816 | |
86812bb0 CS |
4817 | /* initialize the smack_known_list */ |
4818 | init_smack_known_list(); | |
e114e473 CS |
4819 | |
4820 | /* | |
4821 | * Register with LSM | |
4822 | */ | |
b1d9e6b0 | 4823 | security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks)); |
e114e473 CS |
4824 | |
4825 | return 0; | |
4826 | } | |
4827 | ||
4828 | /* | |
4829 | * Smack requires early initialization in order to label | |
4830 | * all processes and objects when they are created. | |
4831 | */ | |
4832 | security_initcall(smack_init); |