Loading...
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
4 *
5 * Author:
6 * Casey Schaufler <casey@schaufler-ca.com>
7 */
8
9#ifndef _SECURITY_SMACK_H
10#define _SECURITY_SMACK_H
11
12#include <linux/capability.h>
13#include <linux/spinlock.h>
14#include <linux/lsm_hooks.h>
15#include <linux/in.h>
16#if IS_ENABLED(CONFIG_IPV6)
17#include <linux/in6.h>
18#endif /* CONFIG_IPV6 */
19#include <net/netlabel.h>
20#include <linux/list.h>
21#include <linux/rculist.h>
22#include <linux/lsm_audit.h>
23#include <linux/msg.h>
24
25/*
26 * Use IPv6 port labeling if IPv6 is enabled and secmarks
27 * are not being used.
28 */
29#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
30#define SMACK_IPV6_PORT_LABELING 1
31#endif
32
33#if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER)
34#define SMACK_IPV6_SECMARK_LABELING 1
35#endif
36
37/*
38 * Smack labels were limited to 23 characters for a long time.
39 */
40#define SMK_LABELLEN 24
41#define SMK_LONGLABEL 256
42
43/*
44 * This is the repository for labels seen so that it is
45 * not necessary to keep allocating tiny chuncks of memory
46 * and so that they can be shared.
47 *
48 * Labels are never modified in place. Anytime a label
49 * is imported (e.g. xattrset on a file) the list is checked
50 * for it and it is added if it doesn't exist. The address
51 * is passed out in either case. Entries are added, but
52 * never deleted.
53 *
54 * Since labels are hanging around anyway it doesn't
55 * hurt to maintain a secid for those awkward situations
56 * where kernel components that ought to use LSM independent
57 * interfaces don't. The secid should go away when all of
58 * these components have been repaired.
59 *
60 * The cipso value associated with the label gets stored here, too.
61 *
62 * Keep the access rules for this subject label here so that
63 * the entire set of rules does not need to be examined every
64 * time.
65 */
66struct smack_known {
67 struct list_head list;
68 struct hlist_node smk_hashed;
69 char *smk_known;
70 u32 smk_secid;
71 struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */
72 struct list_head smk_rules; /* access rules */
73 struct mutex smk_rules_lock; /* lock for rules */
74};
75
76/*
77 * Maximum number of bytes for the levels in a CIPSO IP option.
78 * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
79 * bigger than can be used, and 24 is the next lower multiple
80 * of 8, and there are too many issues if there isn't space set
81 * aside for the terminating null byte.
82 */
83#define SMK_CIPSOLEN 24
84
85struct superblock_smack {
86 struct smack_known *smk_root;
87 struct smack_known *smk_floor;
88 struct smack_known *smk_hat;
89 struct smack_known *smk_default;
90 int smk_flags;
91};
92
93/*
94 * Superblock flags
95 */
96#define SMK_SB_INITIALIZED 0x01
97#define SMK_SB_UNTRUSTED 0x02
98
99struct socket_smack {
100 struct smack_known *smk_out; /* outbound label */
101 struct smack_known *smk_in; /* inbound label */
102 struct smack_known *smk_packet; /* TCP peer label */
103};
104
105/*
106 * Inode smack data
107 */
108struct inode_smack {
109 struct smack_known *smk_inode; /* label of the fso */
110 struct smack_known *smk_task; /* label of the task */
111 struct smack_known *smk_mmap; /* label of the mmap domain */
112 struct mutex smk_lock; /* initialization lock */
113 int smk_flags; /* smack inode flags */
114 struct rcu_head smk_rcu; /* for freeing inode_smack */
115};
116
117struct task_smack {
118 struct smack_known *smk_task; /* label for access control */
119 struct smack_known *smk_forked; /* label when forked */
120 struct list_head smk_rules; /* per task access rules */
121 struct mutex smk_rules_lock; /* lock for the rules */
122 struct list_head smk_relabel; /* transit allowed labels */
123};
124
125#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
126#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
127#define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
128#define SMK_INODE_IMPURE 0x08 /* involved in an impure transaction */
129
130/*
131 * A label access rule.
132 */
133struct smack_rule {
134 struct list_head list;
135 struct smack_known *smk_subject;
136 struct smack_known *smk_object;
137 int smk_access;
138};
139
140/*
141 * An entry in the table identifying IPv4 hosts.
142 */
143struct smk_net4addr {
144 struct list_head list;
145 struct in_addr smk_host; /* network address */
146 struct in_addr smk_mask; /* network mask */
147 int smk_masks; /* mask size */
148 struct smack_known *smk_label; /* label */
149};
150
151#if IS_ENABLED(CONFIG_IPV6)
152/*
153 * An entry in the table identifying IPv6 hosts.
154 */
155struct smk_net6addr {
156 struct list_head list;
157 struct in6_addr smk_host; /* network address */
158 struct in6_addr smk_mask; /* network mask */
159 int smk_masks; /* mask size */
160 struct smack_known *smk_label; /* label */
161};
162#endif /* CONFIG_IPV6 */
163
164#ifdef SMACK_IPV6_PORT_LABELING
165/*
166 * An entry in the table identifying ports.
167 */
168struct smk_port_label {
169 struct list_head list;
170 struct sock *smk_sock; /* socket initialized on */
171 unsigned short smk_port; /* the port number */
172 struct smack_known *smk_in; /* inbound label */
173 struct smack_known *smk_out; /* outgoing label */
174 short smk_sock_type; /* Socket type */
175 short smk_can_reuse;
176};
177#endif /* SMACK_IPV6_PORT_LABELING */
178
179struct smack_known_list_elem {
180 struct list_head list;
181 struct smack_known *smk_label;
182};
183
184/* Super block security struct flags for mount options */
185#define FSDEFAULT_MNT 0x01
186#define FSFLOOR_MNT 0x02
187#define FSHAT_MNT 0x04
188#define FSROOT_MNT 0x08
189#define FSTRANS_MNT 0x10
190
191#define NUM_SMK_MNT_OPTS 5
192
193enum {
194 Opt_error = -1,
195 Opt_fsdefault = 0,
196 Opt_fsfloor = 1,
197 Opt_fshat = 2,
198 Opt_fsroot = 3,
199 Opt_fstransmute = 4,
200};
201
202#define SMACK_DELETE_OPTION "-DELETE"
203#define SMACK_CIPSO_OPTION "-CIPSO"
204
205/*
206 * How communications on this socket are treated.
207 * Usually it's determined by the underlying netlabel code
208 * but there are certain cases, including single label hosts
209 * and potentially single label interfaces for which the
210 * treatment can not be known in advance.
211 *
212 * The possibility of additional labeling schemes being
213 * introduced in the future exists as well.
214 */
215#define SMACK_UNLABELED_SOCKET 0
216#define SMACK_CIPSO_SOCKET 1
217
218/*
219 * CIPSO defaults.
220 */
221#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
222#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
223#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
224#define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
225#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
226/*
227 * CIPSO 2.2 standard is 239, but Smack wants to use the
228 * categories in a structured way that limits the value to
229 * the bits in 23 bytes, hence the unusual number.
230 */
231#define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */
232
233/*
234 * Ptrace rules
235 */
236#define SMACK_PTRACE_DEFAULT 0
237#define SMACK_PTRACE_EXACT 1
238#define SMACK_PTRACE_DRACONIAN 2
239#define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN
240
241/*
242 * Flags for untraditional access modes.
243 * It shouldn't be necessary to avoid conflicts with definitions
244 * in fs.h, but do so anyway.
245 */
246#define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */
247#define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */
248#define MAY_BRINGUP 0x00004000 /* Report use of this rule */
249
250/*
251 * The policy for delivering signals is configurable.
252 * It is usually "write", but can be "append".
253 */
254#ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS
255#define MAY_DELIVER MAY_APPEND /* Signal delivery requires append */
256#else
257#define MAY_DELIVER MAY_WRITE /* Signal delivery requires write */
258#endif
259
260#define SMACK_BRINGUP_ALLOW 1 /* Allow bringup mode */
261#define SMACK_UNCONFINED_SUBJECT 2 /* Allow unconfined label */
262#define SMACK_UNCONFINED_OBJECT 3 /* Allow unconfined label */
263
264/*
265 * Just to make the common cases easier to deal with
266 */
267#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
268#define MAY_READWRITE (MAY_READ | MAY_WRITE)
269#define MAY_NOT 0
270
271/*
272 * Number of access types used by Smack (rwxatlb)
273 */
274#define SMK_NUM_ACCESS_TYPE 7
275
276/* SMACK data */
277struct smack_audit_data {
278 const char *function;
279 char *subject;
280 char *object;
281 char *request;
282 int result;
283};
284
285/*
286 * Smack audit data; is empty if CONFIG_AUDIT not set
287 * to save some stack
288 */
289struct smk_audit_info {
290#ifdef CONFIG_AUDIT
291 struct common_audit_data a;
292 struct smack_audit_data sad;
293#endif
294};
295
296/*
297 * These functions are in smack_access.c
298 */
299int smk_access_entry(char *, char *, struct list_head *);
300int smk_access(struct smack_known *, struct smack_known *,
301 int, struct smk_audit_info *);
302int smk_tskacc(struct task_smack *, struct smack_known *,
303 u32, struct smk_audit_info *);
304int smk_curacc(struct smack_known *, u32, struct smk_audit_info *);
305struct smack_known *smack_from_secid(const u32);
306char *smk_parse_smack(const char *string, int len);
307int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
308struct smack_known *smk_import_entry(const char *, int);
309void smk_insert_entry(struct smack_known *skp);
310struct smack_known *smk_find_entry(const char *);
311bool smack_privileged(int cap);
312bool smack_privileged_cred(int cap, const struct cred *cred);
313void smk_destroy_label_list(struct list_head *list);
314
315/*
316 * Shared data.
317 */
318extern int smack_enabled;
319extern int smack_cipso_direct;
320extern int smack_cipso_mapped;
321extern struct smack_known *smack_net_ambient;
322extern struct smack_known *smack_syslog_label;
323#ifdef CONFIG_SECURITY_SMACK_BRINGUP
324extern struct smack_known *smack_unconfined;
325#endif
326extern int smack_ptrace_rule;
327extern struct lsm_blob_sizes smack_blob_sizes;
328
329extern struct smack_known smack_known_floor;
330extern struct smack_known smack_known_hat;
331extern struct smack_known smack_known_huh;
332extern struct smack_known smack_known_star;
333extern struct smack_known smack_known_web;
334
335extern struct mutex smack_known_lock;
336extern struct list_head smack_known_list;
337extern struct list_head smk_net4addr_list;
338#if IS_ENABLED(CONFIG_IPV6)
339extern struct list_head smk_net6addr_list;
340#endif /* CONFIG_IPV6 */
341
342extern struct mutex smack_onlycap_lock;
343extern struct list_head smack_onlycap_list;
344
345#define SMACK_HASH_SLOTS 16
346extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
347extern struct kmem_cache *smack_rule_cache;
348
349static inline struct task_smack *smack_cred(const struct cred *cred)
350{
351 return cred->security + smack_blob_sizes.lbs_cred;
352}
353
354static inline struct smack_known **smack_file(const struct file *file)
355{
356 return (struct smack_known **)(file->f_security +
357 smack_blob_sizes.lbs_file);
358}
359
360static inline struct inode_smack *smack_inode(const struct inode *inode)
361{
362 return inode->i_security + smack_blob_sizes.lbs_inode;
363}
364
365static inline struct smack_known **smack_msg_msg(const struct msg_msg *msg)
366{
367 return msg->security + smack_blob_sizes.lbs_msg_msg;
368}
369
370static inline struct smack_known **smack_ipc(const struct kern_ipc_perm *ipc)
371{
372 return ipc->security + smack_blob_sizes.lbs_ipc;
373}
374
375/*
376 * Is the directory transmuting?
377 */
378static inline int smk_inode_transmutable(const struct inode *isp)
379{
380 struct inode_smack *sip = smack_inode(isp);
381 return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
382}
383
384/*
385 * Present a pointer to the smack label entry in an inode blob.
386 */
387static inline struct smack_known *smk_of_inode(const struct inode *isp)
388{
389 struct inode_smack *sip = smack_inode(isp);
390 return sip->smk_inode;
391}
392
393/*
394 * Present a pointer to the smack label entry in an task blob.
395 */
396static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
397{
398 return tsp->smk_task;
399}
400
401static inline struct smack_known *smk_of_task_struct(
402 const struct task_struct *t)
403{
404 struct smack_known *skp;
405 const struct cred *cred;
406
407 rcu_read_lock();
408
409 cred = __task_cred(t);
410 skp = smk_of_task(smack_cred(cred));
411
412 rcu_read_unlock();
413
414 return skp;
415}
416
417/*
418 * Present a pointer to the forked smack label entry in an task blob.
419 */
420static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
421{
422 return tsp->smk_forked;
423}
424
425/*
426 * Present a pointer to the smack label in the current task blob.
427 */
428static inline struct smack_known *smk_of_current(void)
429{
430 return smk_of_task(smack_cred(current_cred()));
431}
432
433/*
434 * logging functions
435 */
436#define SMACK_AUDIT_DENIED 0x1
437#define SMACK_AUDIT_ACCEPT 0x2
438extern int log_policy;
439
440void smack_log(char *subject_label, char *object_label,
441 int request,
442 int result, struct smk_audit_info *auditdata);
443
444#ifdef CONFIG_AUDIT
445
446/*
447 * some inline functions to set up audit data
448 * they do nothing if CONFIG_AUDIT is not set
449 *
450 */
451static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
452 char type)
453{
454 memset(&a->sad, 0, sizeof(a->sad));
455 a->a.type = type;
456 a->a.smack_audit_data = &a->sad;
457 a->a.smack_audit_data->function = func;
458}
459
460static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
461 char type, struct lsm_network_audit *net)
462{
463 smk_ad_init(a, func, type);
464 memset(net, 0, sizeof(*net));
465 a->a.u.net = net;
466}
467
468static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
469 struct task_struct *t)
470{
471 a->a.u.tsk = t;
472}
473static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
474 struct dentry *d)
475{
476 a->a.u.dentry = d;
477}
478static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
479 struct inode *i)
480{
481 a->a.u.inode = i;
482}
483static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
484 struct path p)
485{
486 a->a.u.path = p;
487}
488static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
489 struct sock *sk)
490{
491 a->a.u.net->sk = sk;
492}
493
494#else /* no AUDIT */
495
496static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
497 char type)
498{
499}
500static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
501 struct task_struct *t)
502{
503}
504static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
505 struct dentry *d)
506{
507}
508static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
509 struct vfsmount *m)
510{
511}
512static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
513 struct inode *i)
514{
515}
516static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
517 struct path p)
518{
519}
520static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
521 struct sock *sk)
522{
523}
524#endif
525
526#endif /* _SECURITY_SMACK_H */
1/*
2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, version 2.
7 *
8 * Author:
9 * Casey Schaufler <casey@schaufler-ca.com>
10 *
11 */
12
13#ifndef _SECURITY_SMACK_H
14#define _SECURITY_SMACK_H
15
16#include <linux/capability.h>
17#include <linux/spinlock.h>
18#include <linux/security.h>
19#include <linux/in.h>
20#include <net/netlabel.h>
21#include <linux/list.h>
22#include <linux/rculist.h>
23#include <linux/lsm_audit.h>
24
25/*
26 * Smack labels were limited to 23 characters for a long time.
27 */
28#define SMK_LABELLEN 24
29#define SMK_LONGLABEL 256
30
31/*
32 * Maximum number of bytes for the levels in a CIPSO IP option.
33 * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
34 * bigger than can be used, and 24 is the next lower multiple
35 * of 8, and there are too many issues if there isn't space set
36 * aside for the terminating null byte.
37 */
38#define SMK_CIPSOLEN 24
39
40struct superblock_smack {
41 char *smk_root;
42 char *smk_floor;
43 char *smk_hat;
44 char *smk_default;
45 int smk_initialized;
46 spinlock_t smk_sblock; /* for initialization */
47};
48
49struct socket_smack {
50 char *smk_out; /* outbound label */
51 char *smk_in; /* inbound label */
52 char *smk_packet; /* TCP peer label */
53};
54
55/*
56 * Inode smack data
57 */
58struct inode_smack {
59 char *smk_inode; /* label of the fso */
60 char *smk_task; /* label of the task */
61 char *smk_mmap; /* label of the mmap domain */
62 struct mutex smk_lock; /* initialization lock */
63 int smk_flags; /* smack inode flags */
64};
65
66struct task_smack {
67 char *smk_task; /* label for access control */
68 char *smk_forked; /* label when forked */
69 struct list_head smk_rules; /* per task access rules */
70 struct mutex smk_rules_lock; /* lock for the rules */
71};
72
73#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
74#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
75#define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
76
77/*
78 * A label access rule.
79 */
80struct smack_rule {
81 struct list_head list;
82 char *smk_subject;
83 char *smk_object;
84 int smk_access;
85};
86
87/*
88 * An entry in the table identifying hosts.
89 */
90struct smk_netlbladdr {
91 struct list_head list;
92 struct sockaddr_in smk_host; /* network address */
93 struct in_addr smk_mask; /* network mask */
94 char *smk_label; /* label */
95};
96
97/*
98 * This is the repository for labels seen so that it is
99 * not necessary to keep allocating tiny chuncks of memory
100 * and so that they can be shared.
101 *
102 * Labels are never modified in place. Anytime a label
103 * is imported (e.g. xattrset on a file) the list is checked
104 * for it and it is added if it doesn't exist. The address
105 * is passed out in either case. Entries are added, but
106 * never deleted.
107 *
108 * Since labels are hanging around anyway it doesn't
109 * hurt to maintain a secid for those awkward situations
110 * where kernel components that ought to use LSM independent
111 * interfaces don't. The secid should go away when all of
112 * these components have been repaired.
113 *
114 * The cipso value associated with the label gets stored here, too.
115 *
116 * Keep the access rules for this subject label here so that
117 * the entire set of rules does not need to be examined every
118 * time.
119 */
120struct smack_known {
121 struct list_head list;
122 char *smk_known;
123 u32 smk_secid;
124 struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */
125 struct list_head smk_rules; /* access rules */
126 struct mutex smk_rules_lock; /* lock for rules */
127};
128
129/*
130 * Mount options
131 */
132#define SMK_FSDEFAULT "smackfsdef="
133#define SMK_FSFLOOR "smackfsfloor="
134#define SMK_FSHAT "smackfshat="
135#define SMK_FSROOT "smackfsroot="
136
137#define SMACK_CIPSO_OPTION "-CIPSO"
138
139/*
140 * How communications on this socket are treated.
141 * Usually it's determined by the underlying netlabel code
142 * but there are certain cases, including single label hosts
143 * and potentially single label interfaces for which the
144 * treatment can not be known in advance.
145 *
146 * The possibility of additional labeling schemes being
147 * introduced in the future exists as well.
148 */
149#define SMACK_UNLABELED_SOCKET 0
150#define SMACK_CIPSO_SOCKET 1
151
152/*
153 * smackfs magic number
154 */
155#define SMACK_MAGIC 0x43415d53 /* "SMAC" */
156
157/*
158 * CIPSO defaults.
159 */
160#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
161#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
162#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
163#define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
164#define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
165#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
166#define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
167
168/*
169 * Flag for transmute access
170 */
171#define MAY_TRANSMUTE 64
172/*
173 * Just to make the common cases easier to deal with
174 */
175#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
176#define MAY_READWRITE (MAY_READ | MAY_WRITE)
177#define MAY_NOT 0
178
179/*
180 * Number of access types used by Smack (rwxat)
181 */
182#define SMK_NUM_ACCESS_TYPE 5
183
184/* SMACK data */
185struct smack_audit_data {
186 const char *function;
187 char *subject;
188 char *object;
189 char *request;
190 int result;
191};
192
193/*
194 * Smack audit data; is empty if CONFIG_AUDIT not set
195 * to save some stack
196 */
197struct smk_audit_info {
198#ifdef CONFIG_AUDIT
199 struct common_audit_data a;
200 struct smack_audit_data sad;
201#endif
202};
203/*
204 * These functions are in smack_lsm.c
205 */
206struct inode_smack *new_inode_smack(char *);
207
208/*
209 * These functions are in smack_access.c
210 */
211int smk_access_entry(char *, char *, struct list_head *);
212int smk_access(char *, char *, int, struct smk_audit_info *);
213int smk_curacc(char *, u32, struct smk_audit_info *);
214char *smack_from_secid(const u32);
215char *smk_parse_smack(const char *string, int len);
216int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
217char *smk_import(const char *, int);
218struct smack_known *smk_import_entry(const char *, int);
219struct smack_known *smk_find_entry(const char *);
220u32 smack_to_secid(const char *);
221
222/*
223 * Shared data.
224 */
225extern int smack_cipso_direct;
226extern int smack_cipso_mapped;
227extern char *smack_net_ambient;
228extern char *smack_onlycap;
229extern const char *smack_cipso_option;
230
231extern struct smack_known smack_known_floor;
232extern struct smack_known smack_known_hat;
233extern struct smack_known smack_known_huh;
234extern struct smack_known smack_known_invalid;
235extern struct smack_known smack_known_star;
236extern struct smack_known smack_known_web;
237
238extern struct mutex smack_known_lock;
239extern struct list_head smack_known_list;
240extern struct list_head smk_netlbladdr_list;
241
242extern struct security_operations smack_ops;
243
244/*
245 * Is the directory transmuting?
246 */
247static inline int smk_inode_transmutable(const struct inode *isp)
248{
249 struct inode_smack *sip = isp->i_security;
250 return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
251}
252
253/*
254 * Present a pointer to the smack label in an inode blob.
255 */
256static inline char *smk_of_inode(const struct inode *isp)
257{
258 struct inode_smack *sip = isp->i_security;
259 return sip->smk_inode;
260}
261
262/*
263 * Present a pointer to the smack label in an task blob.
264 */
265static inline char *smk_of_task(const struct task_smack *tsp)
266{
267 return tsp->smk_task;
268}
269
270/*
271 * Present a pointer to the forked smack label in an task blob.
272 */
273static inline char *smk_of_forked(const struct task_smack *tsp)
274{
275 return tsp->smk_forked;
276}
277
278/*
279 * Present a pointer to the smack label in the current task blob.
280 */
281static inline char *smk_of_current(void)
282{
283 return smk_of_task(current_security());
284}
285
286/*
287 * logging functions
288 */
289#define SMACK_AUDIT_DENIED 0x1
290#define SMACK_AUDIT_ACCEPT 0x2
291extern int log_policy;
292
293void smack_log(char *subject_label, char *object_label,
294 int request,
295 int result, struct smk_audit_info *auditdata);
296
297#ifdef CONFIG_AUDIT
298
299/*
300 * some inline functions to set up audit data
301 * they do nothing if CONFIG_AUDIT is not set
302 *
303 */
304static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
305 char type)
306{
307 memset(&a->sad, 0, sizeof(a->sad));
308 a->a.type = type;
309 a->a.smack_audit_data = &a->sad;
310 a->a.smack_audit_data->function = func;
311}
312
313static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
314 char type, struct lsm_network_audit *net)
315{
316 smk_ad_init(a, func, type);
317 memset(net, 0, sizeof(*net));
318 a->a.u.net = net;
319}
320
321static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
322 struct task_struct *t)
323{
324 a->a.u.tsk = t;
325}
326static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
327 struct dentry *d)
328{
329 a->a.u.dentry = d;
330}
331static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
332 struct inode *i)
333{
334 a->a.u.inode = i;
335}
336static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
337 struct path p)
338{
339 a->a.u.path = p;
340}
341static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
342 struct sock *sk)
343{
344 a->a.u.net->sk = sk;
345}
346
347#else /* no AUDIT */
348
349static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
350 char type)
351{
352}
353static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
354 struct task_struct *t)
355{
356}
357static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
358 struct dentry *d)
359{
360}
361static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
362 struct vfsmount *m)
363{
364}
365static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
366 struct inode *i)
367{
368}
369static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
370 struct path p)
371{
372}
373static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
374 struct sock *sk)
375{
376}
377#endif
378
379#endif /* _SECURITY_SMACK_H */