LSM: shrink sizeof LSM specific portion of common_audit_data
[linux-2.6-block.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/*
26 * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
27 * bigger than can be used, and 24 is the next lower multiple
28 * of 8, and there are too many issues if there isn't space set
29 * aside for the terminating null byte.
30 */
31#define SMK_MAXLEN 23
32#define SMK_LABELLEN (SMK_MAXLEN+1)
33
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34struct superblock_smack {
35 char *smk_root;
36 char *smk_floor;
37 char *smk_hat;
38 char *smk_default;
39 int smk_initialized;
40 spinlock_t smk_sblock; /* for initialization */
41};
42
43struct socket_smack {
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44 char *smk_out; /* outbound label */
45 char *smk_in; /* inbound label */
46 char *smk_packet; /* TCP peer label */
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47};
48
49/*
50 * Inode smack data
51 */
52struct inode_smack {
53 char *smk_inode; /* label of the fso */
676dac4b 54 char *smk_task; /* label of the task */
7898e1f8 55 char *smk_mmap; /* label of the mmap domain */
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56 struct mutex smk_lock; /* initialization lock */
57 int smk_flags; /* smack inode flags */
58};
59
676dac4b 60struct task_smack {
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61 char *smk_task; /* label for access control */
62 char *smk_forked; /* label when forked */
63 struct list_head smk_rules; /* per task access rules */
64 struct mutex smk_rules_lock; /* lock for the rules */
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65};
66
e114e473 67#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
5c6d1125 68#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
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69
70/*
71 * A label access rule.
72 */
73struct smack_rule {
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74 struct list_head list;
75 char *smk_subject;
76 char *smk_object;
77 int smk_access;
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78};
79
80/*
81 * An entry in the table mapping smack values to
82 * CIPSO level/category-set values.
83 */
84struct smack_cipso {
85 int smk_level;
86 char smk_catset[SMK_LABELLEN];
87};
88
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89/*
90 * An entry in the table identifying hosts.
91 */
92struct smk_netlbladdr {
7198e2ee 93 struct list_head list;
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94 struct sockaddr_in smk_host; /* network address */
95 struct in_addr smk_mask; /* network mask */
96 char *smk_label; /* label */
97};
98
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99/*
100 * This is the repository for labels seen so that it is
101 * not necessary to keep allocating tiny chuncks of memory
102 * and so that they can be shared.
103 *
104 * Labels are never modified in place. Anytime a label
105 * is imported (e.g. xattrset on a file) the list is checked
106 * for it and it is added if it doesn't exist. The address
107 * is passed out in either case. Entries are added, but
108 * never deleted.
109 *
110 * Since labels are hanging around anyway it doesn't
111 * hurt to maintain a secid for those awkward situations
112 * where kernel components that ought to use LSM independent
113 * interfaces don't. The secid should go away when all of
114 * these components have been repaired.
115 *
116 * If there is a cipso value associated with the label it
117 * gets stored here, too. This will most likely be rare as
118 * the cipso direct mapping in used internally.
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119 *
120 * Keep the access rules for this subject label here so that
121 * the entire set of rules does not need to be examined every
122 * time.
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123 */
124struct smack_known {
7198e2ee 125 struct list_head list;
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126 char smk_known[SMK_LABELLEN];
127 u32 smk_secid;
128 struct smack_cipso *smk_cipso;
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129 spinlock_t smk_cipsolock; /* for changing cipso map */
130 struct list_head smk_rules; /* access rules */
131 struct mutex smk_rules_lock; /* lock for the rules */
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132};
133
134/*
135 * Mount options
136 */
137#define SMK_FSDEFAULT "smackfsdef="
138#define SMK_FSFLOOR "smackfsfloor="
139#define SMK_FSHAT "smackfshat="
140#define SMK_FSROOT "smackfsroot="
141
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142#define SMACK_CIPSO_OPTION "-CIPSO"
143
e114e473 144/*
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145 * How communications on this socket are treated.
146 * Usually it's determined by the underlying netlabel code
147 * but there are certain cases, including single label hosts
148 * and potentially single label interfaces for which the
149 * treatment can not be known in advance.
150 *
151 * The possibility of additional labeling schemes being
152 * introduced in the future exists as well.
153 */
154#define SMACK_UNLABELED_SOCKET 0
155#define SMACK_CIPSO_SOCKET 1
156
157/*
158 * smackfs magic number
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159 */
160#define SMACK_MAGIC 0x43415d53 /* "SMAC" */
161
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162/*
163 * CIPSO defaults.
164 */
165#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
6d3dc07c 166#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
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167#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
168#define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
169#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
170#define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
171
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172/*
173 * Flag for transmute access
174 */
175#define MAY_TRANSMUTE 64
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176/*
177 * Just to make the common cases easier to deal with
178 */
e114e473 179#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
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180#define MAY_READWRITE (MAY_READ | MAY_WRITE)
181#define MAY_NOT 0
182
ecfcc53f 183/*
ce8a4321 184 * Number of access types used by Smack (rwxat)
ecfcc53f 185 */
ce8a4321 186#define SMK_NUM_ACCESS_TYPE 5
ecfcc53f 187
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188/* SMACK data */
189struct smack_audit_data {
190 const char *function;
191 char *subject;
192 char *object;
193 char *request;
194 int result;
195};
196
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197/*
198 * Smack audit data; is empty if CONFIG_AUDIT not set
199 * to save some stack
200 */
201struct smk_audit_info {
202#ifdef CONFIG_AUDIT
203 struct common_audit_data a;
3b3b0e4f 204 struct smack_audit_data sad;
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205#endif
206};
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207/*
208 * These functions are in smack_lsm.c
209 */
210struct inode_smack *new_inode_smack(char *);
211
212/*
213 * These functions are in smack_access.c
214 */
7898e1f8 215int smk_access_entry(char *, char *, struct list_head *);
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216int smk_access(char *, char *, int, struct smk_audit_info *);
217int smk_curacc(char *, u32, struct smk_audit_info *);
e114e473 218int smack_to_cipso(const char *, struct smack_cipso *);
272cd7a8 219char *smack_from_cipso(u32, char *);
e114e473 220char *smack_from_secid(const u32);
0e94ae17 221void smk_parse_smack(const char *string, int len, char *smack);
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222char *smk_import(const char *, int);
223struct smack_known *smk_import_entry(const char *, int);
272cd7a8 224struct smack_known *smk_find_entry(const char *);
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225u32 smack_to_secid(const char *);
226
227/*
228 * Shared data.
229 */
230extern int smack_cipso_direct;
e114e473 231extern char *smack_net_ambient;
15446235 232extern char *smack_onlycap;
4303154e 233extern const char *smack_cipso_option;
e114e473 234
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235extern struct smack_known smack_known_floor;
236extern struct smack_known smack_known_hat;
237extern struct smack_known smack_known_huh;
238extern struct smack_known smack_known_invalid;
239extern struct smack_known smack_known_star;
6d3dc07c 240extern struct smack_known smack_known_web;
e114e473 241
7198e2ee 242extern struct list_head smack_known_list;
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243extern struct list_head smk_netlbladdr_list;
244
076c54c5 245extern struct security_operations smack_ops;
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246
247/*
248 * Stricly for CIPSO level manipulation.
249 * Set the category bit number in a smack label sized buffer.
250 */
251static inline void smack_catset_bit(int cat, char *catsetp)
252{
253 if (cat > SMK_LABELLEN * 8)
254 return;
255
256 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
257}
258
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259/*
260 * Is the directory transmuting?
261 */
262static inline int smk_inode_transmutable(const struct inode *isp)
263{
264 struct inode_smack *sip = isp->i_security;
265 return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
266}
267
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268/*
269 * Present a pointer to the smack label in an inode blob.
270 */
271static inline char *smk_of_inode(const struct inode *isp)
272{
273 struct inode_smack *sip = isp->i_security;
274 return sip->smk_inode;
275}
276
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277/*
278 * Present a pointer to the smack label in an task blob.
279 */
280static inline char *smk_of_task(const struct task_smack *tsp)
281{
282 return tsp->smk_task;
283}
284
285/*
286 * Present a pointer to the forked smack label in an task blob.
287 */
288static inline char *smk_of_forked(const struct task_smack *tsp)
289{
290 return tsp->smk_forked;
291}
292
293/*
5c6d1125 294 * Present a pointer to the smack label in the current task blob.
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295 */
296static inline char *smk_of_current(void)
297{
298 return smk_of_task(current_security());
299}
300
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301/*
302 * logging functions
303 */
304#define SMACK_AUDIT_DENIED 0x1
305#define SMACK_AUDIT_ACCEPT 0x2
306extern int log_policy;
307
308void smack_log(char *subject_label, char *object_label,
309 int request,
310 int result, struct smk_audit_info *auditdata);
311
312#ifdef CONFIG_AUDIT
313
314/*
315 * some inline functions to set up audit data
316 * they do nothing if CONFIG_AUDIT is not set
317 *
318 */
319static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
320 char type)
321{
322 memset(a, 0, sizeof(*a));
323 a->a.type = type;
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324 a->a.smack_audit_data = &a->sad;
325 a->a.smack_audit_data->function = func;
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326}
327
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{
351 a->a.u.net.sk = sk;
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 */