Merge git://git.infradead.org/users/eparis/audit
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / security / smack / smack.h
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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>
076c54c5 18#include <linux/security.h>
6d3dc07c 19#include <linux/in.h>
e114e473 20#include <net/netlabel.h>
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21#include <linux/list.h>
22#include <linux/rculist.h>
ecfcc53f 23#include <linux/lsm_audit.h>
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24
25/*
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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.
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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 */
f7112e6c 38#define SMK_CIPSOLEN 24
e114e473 39
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40struct superblock_smack {
41 char *smk_root;
42 char *smk_floor;
43 char *smk_hat;
44 char *smk_default;
45 int smk_initialized;
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46};
47
48struct socket_smack {
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49 char *smk_out; /* outbound label */
50 char *smk_in; /* inbound label */
51 char *smk_packet; /* TCP peer label */
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52};
53
54/*
55 * Inode smack data
56 */
57struct inode_smack {
58 char *smk_inode; /* label of the fso */
676dac4b 59 char *smk_task; /* label of the task */
7898e1f8 60 char *smk_mmap; /* label of the mmap domain */
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61 struct mutex smk_lock; /* initialization lock */
62 int smk_flags; /* smack inode flags */
63};
64
676dac4b 65struct task_smack {
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66 char *smk_task; /* label for access control */
67 char *smk_forked; /* label when forked */
68 struct list_head smk_rules; /* per task access rules */
69 struct mutex smk_rules_lock; /* lock for the rules */
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70};
71
e114e473 72#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
5c6d1125 73#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
2267b13a 74#define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
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75
76/*
77 * A label access rule.
78 */
79struct smack_rule {
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80 struct list_head list;
81 char *smk_subject;
82 char *smk_object;
83 int smk_access;
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84};
85
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86/*
87 * An entry in the table identifying hosts.
88 */
89struct smk_netlbladdr {
7198e2ee 90 struct list_head list;
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91 struct sockaddr_in smk_host; /* network address */
92 struct in_addr smk_mask; /* network mask */
93 char *smk_label; /* label */
94};
95
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96/*
97 * This is the repository for labels seen so that it is
98 * not necessary to keep allocating tiny chuncks of memory
99 * and so that they can be shared.
100 *
101 * Labels are never modified in place. Anytime a label
102 * is imported (e.g. xattrset on a file) the list is checked
103 * for it and it is added if it doesn't exist. The address
104 * is passed out in either case. Entries are added, but
105 * never deleted.
106 *
107 * Since labels are hanging around anyway it doesn't
108 * hurt to maintain a secid for those awkward situations
109 * where kernel components that ought to use LSM independent
110 * interfaces don't. The secid should go away when all of
111 * these components have been repaired.
112 *
f7112e6c 113 * The cipso value associated with the label gets stored here, too.
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114 *
115 * Keep the access rules for this subject label here so that
116 * the entire set of rules does not need to be examined every
117 * time.
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118 */
119struct smack_known {
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120 struct list_head list;
121 char *smk_known;
122 u32 smk_secid;
123 struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */
124 struct list_head smk_rules; /* access rules */
125 struct mutex smk_rules_lock; /* lock for rules */
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126};
127
128/*
129 * Mount options
130 */
131#define SMK_FSDEFAULT "smackfsdef="
132#define SMK_FSFLOOR "smackfsfloor="
133#define SMK_FSHAT "smackfshat="
134#define SMK_FSROOT "smackfsroot="
135
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136#define SMACK_CIPSO_OPTION "-CIPSO"
137
e114e473 138/*
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139 * How communications on this socket are treated.
140 * Usually it's determined by the underlying netlabel code
141 * but there are certain cases, including single label hosts
142 * and potentially single label interfaces for which the
143 * treatment can not be known in advance.
144 *
145 * The possibility of additional labeling schemes being
146 * introduced in the future exists as well.
147 */
148#define SMACK_UNLABELED_SOCKET 0
149#define SMACK_CIPSO_SOCKET 1
150
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151/*
152 * CIPSO defaults.
153 */
154#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
6d3dc07c 155#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
e114e473 156#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
f7112e6c 157#define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
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158#define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
159#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
160#define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
161
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162/*
163 * Flag for transmute access
164 */
165#define MAY_TRANSMUTE 64
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166/*
167 * Just to make the common cases easier to deal with
168 */
e114e473 169#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
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170#define MAY_READWRITE (MAY_READ | MAY_WRITE)
171#define MAY_NOT 0
172
ecfcc53f 173/*
ce8a4321 174 * Number of access types used by Smack (rwxat)
ecfcc53f 175 */
ce8a4321 176#define SMK_NUM_ACCESS_TYPE 5
ecfcc53f 177
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178/* SMACK data */
179struct smack_audit_data {
180 const char *function;
181 char *subject;
182 char *object;
183 char *request;
184 int result;
185};
186
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187/*
188 * Smack audit data; is empty if CONFIG_AUDIT not set
189 * to save some stack
190 */
191struct smk_audit_info {
192#ifdef CONFIG_AUDIT
193 struct common_audit_data a;
3b3b0e4f 194 struct smack_audit_data sad;
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195#endif
196};
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197/*
198 * These functions are in smack_lsm.c
199 */
200struct inode_smack *new_inode_smack(char *);
201
202/*
203 * These functions are in smack_access.c
204 */
7898e1f8 205int smk_access_entry(char *, char *, struct list_head *);
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206int smk_access(char *, char *, int, struct smk_audit_info *);
207int smk_curacc(char *, u32, struct smk_audit_info *);
e114e473 208char *smack_from_secid(const u32);
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209char *smk_parse_smack(const char *string, int len);
210int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
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211char *smk_import(const char *, int);
212struct smack_known *smk_import_entry(const char *, int);
272cd7a8 213struct smack_known *smk_find_entry(const char *);
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214u32 smack_to_secid(const char *);
215
216/*
217 * Shared data.
218 */
219extern int smack_cipso_direct;
f7112e6c 220extern int smack_cipso_mapped;
e114e473 221extern char *smack_net_ambient;
15446235 222extern char *smack_onlycap;
4303154e 223extern const char *smack_cipso_option;
e114e473 224
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225extern struct smack_known smack_known_floor;
226extern struct smack_known smack_known_hat;
227extern struct smack_known smack_known_huh;
228extern struct smack_known smack_known_invalid;
229extern struct smack_known smack_known_star;
6d3dc07c 230extern struct smack_known smack_known_web;
e114e473 231
f7112e6c 232extern struct mutex smack_known_lock;
7198e2ee 233extern struct list_head smack_known_list;
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234extern struct list_head smk_netlbladdr_list;
235
076c54c5 236extern struct security_operations smack_ops;
e114e473 237
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238/*
239 * Is the directory transmuting?
240 */
241static inline int smk_inode_transmutable(const struct inode *isp)
242{
243 struct inode_smack *sip = isp->i_security;
244 return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
245}
246
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247/*
248 * Present a pointer to the smack label in an inode blob.
249 */
250static inline char *smk_of_inode(const struct inode *isp)
251{
252 struct inode_smack *sip = isp->i_security;
253 return sip->smk_inode;
254}
255
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256/*
257 * Present a pointer to the smack label in an task blob.
258 */
259static inline char *smk_of_task(const struct task_smack *tsp)
260{
261 return tsp->smk_task;
262}
263
264/*
265 * Present a pointer to the forked smack label in an task blob.
266 */
267static inline char *smk_of_forked(const struct task_smack *tsp)
268{
269 return tsp->smk_forked;
270}
271
272/*
5c6d1125 273 * Present a pointer to the smack label in the current task blob.
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274 */
275static inline char *smk_of_current(void)
276{
277 return smk_of_task(current_security());
278}
279
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280/*
281 * Is the task privileged and allowed to be privileged
282 * by the onlycap rule.
283 */
284static inline int smack_privileged(int cap)
285{
286 if (!capable(cap))
287 return 0;
288 if (smack_onlycap == NULL || smack_onlycap == smk_of_current())
289 return 1;
290 return 0;
291}
292
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293/*
294 * logging functions
295 */
296#define SMACK_AUDIT_DENIED 0x1
297#define SMACK_AUDIT_ACCEPT 0x2
298extern int log_policy;
299
300void smack_log(char *subject_label, char *object_label,
301 int request,
302 int result, struct smk_audit_info *auditdata);
303
304#ifdef CONFIG_AUDIT
305
306/*
307 * some inline functions to set up audit data
308 * they do nothing if CONFIG_AUDIT is not set
309 *
310 */
311static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
312 char type)
313{
50c205f5 314 memset(&a->sad, 0, sizeof(a->sad));
ecfcc53f 315 a->a.type = type;
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316 a->a.smack_audit_data = &a->sad;
317 a->a.smack_audit_data->function = func;
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318}
319
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320static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
321 char type, struct lsm_network_audit *net)
322{
323 smk_ad_init(a, func, type);
324 memset(net, 0, sizeof(*net));
325 a->a.u.net = net;
326}
327
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328static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
329 struct task_struct *t)
330{
331 a->a.u.tsk = t;
332}
333static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
334 struct dentry *d)
335{
a269434d 336 a->a.u.dentry = d;
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337}
338static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
339 struct inode *i)
340{
f48b7399 341 a->a.u.inode = i;
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342}
343static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
344 struct path p)
345{
f48b7399 346 a->a.u.path = p;
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347}
348static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
349 struct sock *sk)
350{
48c62af6 351 a->a.u.net->sk = sk;
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352}
353
354#else /* no AUDIT */
355
356static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
357 char type)
358{
359}
360static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
361 struct task_struct *t)
362{
363}
364static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
365 struct dentry *d)
366{
367}
368static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
369 struct vfsmount *m)
370{
371}
372static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
373 struct inode *i)
374{
375}
376static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
377 struct path p)
378{
379}
380static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
381 struct sock *sk)
382{
383}
384#endif
385
e114e473 386#endif /* _SECURITY_SMACK_H */