2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
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.
9 * Casey Schaufler <casey@schaufler-ca.com>
13 #ifndef _SECURITY_SMACK_H
14 #define _SECURITY_SMACK_H
16 #include <linux/capability.h>
17 #include <linux/spinlock.h>
18 #include <linux/security.h>
20 #include <net/netlabel.h>
21 #include <linux/list.h>
22 #include <linux/rculist.h>
23 #include <linux/lsm_audit.h>
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.
32 #define SMK_LABELLEN (SMK_MAXLEN+1)
34 struct superblock_smack
{
40 spinlock_t smk_sblock
; /* for initialization */
44 char *smk_out
; /* outbound label */
45 char *smk_in
; /* inbound label */
46 char *smk_packet
; /* TCP peer label */
53 char *smk_inode
; /* label of the fso */
54 char *smk_task
; /* label of the task */
55 char *smk_mmap
; /* label of the mmap domain */
56 struct mutex smk_lock
; /* initialization lock */
57 int smk_flags
; /* smack inode flags */
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 */
67 #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
68 #define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
71 * A label access rule.
74 struct list_head list
;
81 * An entry in the table mapping smack values to
82 * CIPSO level/category-set values.
86 char smk_catset
[SMK_LABELLEN
];
90 * An entry in the table identifying hosts.
92 struct smk_netlbladdr
{
93 struct list_head list
;
94 struct sockaddr_in smk_host
; /* network address */
95 struct in_addr smk_mask
; /* network mask */
96 char *smk_label
; /* label */
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.
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
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.
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.
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
125 struct list_head list
;
126 char smk_known
[SMK_LABELLEN
];
128 struct smack_cipso
*smk_cipso
;
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 */
137 #define SMK_FSDEFAULT "smackfsdef="
138 #define SMK_FSFLOOR "smackfsfloor="
139 #define SMK_FSHAT "smackfshat="
140 #define SMK_FSROOT "smackfsroot="
142 #define SMACK_CIPSO_OPTION "-CIPSO"
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.
151 * The possibility of additional labeling schemes being
152 * introduced in the future exists as well.
154 #define SMACK_UNLABELED_SOCKET 0
155 #define SMACK_CIPSO_SOCKET 1
158 * smackfs magic number
160 #define SMACK_MAGIC 0x43415d53 /* "SMAC" */
165 #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
166 #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
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 */
173 * Flag for transmute access
175 #define MAY_TRANSMUTE 64
177 * Just to make the common cases easier to deal with
179 #define MAY_ANYREAD (MAY_READ | MAY_EXEC)
180 #define MAY_READWRITE (MAY_READ | MAY_WRITE)
184 * Number of access types used by Smack (rwxat)
186 #define SMK_NUM_ACCESS_TYPE 5
189 struct smack_audit_data
{
190 const char *function
;
198 * Smack audit data; is empty if CONFIG_AUDIT not set
201 struct smk_audit_info
{
203 struct common_audit_data a
;
204 struct smack_audit_data sad
;
208 * These functions are in smack_lsm.c
210 struct inode_smack
*new_inode_smack(char *);
213 * These functions are in smack_access.c
215 int smk_access_entry(char *, char *, struct list_head
*);
216 int smk_access(char *, char *, int, struct smk_audit_info
*);
217 int smk_curacc(char *, u32
, struct smk_audit_info
*);
218 int smack_to_cipso(const char *, struct smack_cipso
*);
219 char *smack_from_cipso(u32
, char *);
220 char *smack_from_secid(const u32
);
221 void smk_parse_smack(const char *string
, int len
, char *smack
);
222 char *smk_import(const char *, int);
223 struct smack_known
*smk_import_entry(const char *, int);
224 struct smack_known
*smk_find_entry(const char *);
225 u32
smack_to_secid(const char *);
230 extern int smack_cipso_direct
;
231 extern char *smack_net_ambient
;
232 extern char *smack_onlycap
;
233 extern const char *smack_cipso_option
;
235 extern struct smack_known smack_known_floor
;
236 extern struct smack_known smack_known_hat
;
237 extern struct smack_known smack_known_huh
;
238 extern struct smack_known smack_known_invalid
;
239 extern struct smack_known smack_known_star
;
240 extern struct smack_known smack_known_web
;
242 extern struct list_head smack_known_list
;
243 extern struct list_head smk_netlbladdr_list
;
245 extern struct security_operations smack_ops
;
248 * Stricly for CIPSO level manipulation.
249 * Set the category bit number in a smack label sized buffer.
251 static inline void smack_catset_bit(int cat
, char *catsetp
)
253 if (cat
> SMK_LABELLEN
* 8)
256 catsetp
[(cat
- 1) / 8] |= 0x80 >> ((cat
- 1) % 8);
260 * Is the directory transmuting?
262 static inline int smk_inode_transmutable(const struct inode
*isp
)
264 struct inode_smack
*sip
= isp
->i_security
;
265 return (sip
->smk_flags
& SMK_INODE_TRANSMUTE
) != 0;
269 * Present a pointer to the smack label in an inode blob.
271 static inline char *smk_of_inode(const struct inode
*isp
)
273 struct inode_smack
*sip
= isp
->i_security
;
274 return sip
->smk_inode
;
278 * Present a pointer to the smack label in an task blob.
280 static inline char *smk_of_task(const struct task_smack
*tsp
)
282 return tsp
->smk_task
;
286 * Present a pointer to the forked smack label in an task blob.
288 static inline char *smk_of_forked(const struct task_smack
*tsp
)
290 return tsp
->smk_forked
;
294 * Present a pointer to the smack label in the current task blob.
296 static inline char *smk_of_current(void)
298 return smk_of_task(current_security());
304 #define SMACK_AUDIT_DENIED 0x1
305 #define SMACK_AUDIT_ACCEPT 0x2
306 extern int log_policy
;
308 void smack_log(char *subject_label
, char *object_label
,
310 int result
, struct smk_audit_info
*auditdata
);
315 * some inline functions to set up audit data
316 * they do nothing if CONFIG_AUDIT is not set
319 static inline void smk_ad_init(struct smk_audit_info
*a
, const char *func
,
322 memset(a
, 0, sizeof(*a
));
324 a
->a
.smack_audit_data
= &a
->sad
;
325 a
->a
.smack_audit_data
->function
= func
;
328 static inline void smk_ad_setfield_u_tsk(struct smk_audit_info
*a
,
329 struct task_struct
*t
)
333 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info
*a
,
338 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info
*a
,
343 static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info
*a
,
348 static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info
*a
,
356 static inline void smk_ad_init(struct smk_audit_info
*a
, const char *func
,
360 static inline void smk_ad_setfield_u_tsk(struct smk_audit_info
*a
,
361 struct task_struct
*t
)
364 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info
*a
,
368 static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info
*a
,
372 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info
*a
,
376 static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info
*a
,
380 static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info
*a
,
386 #endif /* _SECURITY_SMACK_H */