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 * Smack labels were limited to 23 characters for a long time.
28 #define SMK_LABELLEN 24
29 #define SMK_LONGLABEL 256
32 * This is the repository for labels seen so that it is
33 * not necessary to keep allocating tiny chuncks of memory
34 * and so that they can be shared.
36 * Labels are never modified in place. Anytime a label
37 * is imported (e.g. xattrset on a file) the list is checked
38 * for it and it is added if it doesn't exist. The address
39 * is passed out in either case. Entries are added, but
42 * Since labels are hanging around anyway it doesn't
43 * hurt to maintain a secid for those awkward situations
44 * where kernel components that ought to use LSM independent
45 * interfaces don't. The secid should go away when all of
46 * these components have been repaired.
48 * The cipso value associated with the label gets stored here, too.
50 * Keep the access rules for this subject label here so that
51 * the entire set of rules does not need to be examined every
55 struct list_head list
;
58 struct netlbl_lsm_secattr smk_netlabel
; /* on wire labels */
59 struct list_head smk_rules
; /* access rules */
60 struct mutex smk_rules_lock
; /* lock for rules */
64 * Maximum number of bytes for the levels in a CIPSO IP option.
65 * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
66 * bigger than can be used, and 24 is the next lower multiple
67 * of 8, and there are too many issues if there isn't space set
68 * aside for the terminating null byte.
70 #define SMK_CIPSOLEN 24
72 struct superblock_smack
{
81 struct smack_known
*smk_out
; /* outbound label */
82 char *smk_in
; /* inbound label */
83 char *smk_packet
; /* TCP peer label */
90 char *smk_inode
; /* label of the fso */
91 struct smack_known
*smk_task
; /* label of the task */
92 struct smack_known
*smk_mmap
; /* label of the mmap domain */
93 struct mutex smk_lock
; /* initialization lock */
94 int smk_flags
; /* smack inode flags */
98 struct smack_known
*smk_task
; /* label for access control */
99 struct smack_known
*smk_forked
; /* label when forked */
100 struct list_head smk_rules
; /* per task access rules */
101 struct mutex smk_rules_lock
; /* lock for the rules */
104 #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
105 #define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
106 #define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
109 * A label access rule.
112 struct list_head list
;
113 struct smack_known
*smk_subject
;
119 * An entry in the table identifying hosts.
121 struct smk_netlbladdr
{
122 struct list_head list
;
123 struct sockaddr_in smk_host
; /* network address */
124 struct in_addr smk_mask
; /* network mask */
125 char *smk_label
; /* label */
129 * An entry in the table identifying ports.
131 struct smk_port_label
{
132 struct list_head list
;
133 struct sock
*smk_sock
; /* socket initialized on */
134 unsigned short smk_port
; /* the port number */
135 char *smk_in
; /* incoming label */
136 struct smack_known
*smk_out
; /* outgoing label */
142 #define SMK_FSDEFAULT "smackfsdef="
143 #define SMK_FSFLOOR "smackfsfloor="
144 #define SMK_FSHAT "smackfshat="
145 #define SMK_FSROOT "smackfsroot="
146 #define SMK_FSTRANS "smackfstransmute="
148 #define SMACK_CIPSO_OPTION "-CIPSO"
151 * How communications on this socket are treated.
152 * Usually it's determined by the underlying netlabel code
153 * but there are certain cases, including single label hosts
154 * and potentially single label interfaces for which the
155 * treatment can not be known in advance.
157 * The possibility of additional labeling schemes being
158 * introduced in the future exists as well.
160 #define SMACK_UNLABELED_SOCKET 0
161 #define SMACK_CIPSO_SOCKET 1
166 #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
167 #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
168 #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
169 #define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
170 #define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
171 #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
172 #define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
175 * Flag for transmute access
177 #define MAY_TRANSMUTE 64
179 * Just to make the common cases easier to deal with
181 #define MAY_ANYREAD (MAY_READ | MAY_EXEC)
182 #define MAY_READWRITE (MAY_READ | MAY_WRITE)
186 * Number of access types used by Smack (rwxat)
188 #define SMK_NUM_ACCESS_TYPE 5
191 struct smack_audit_data
{
192 const char *function
;
200 * Smack audit data; is empty if CONFIG_AUDIT not set
203 struct smk_audit_info
{
205 struct common_audit_data a
;
206 struct smack_audit_data sad
;
210 * These functions are in smack_lsm.c
212 struct inode_smack
*new_inode_smack(char *);
215 * These functions are in smack_access.c
217 int smk_access_entry(char *, char *, struct list_head
*);
218 int smk_access(struct smack_known
*, char *, int, struct smk_audit_info
*);
219 int smk_curacc(char *, u32
, struct smk_audit_info
*);
220 struct smack_known
*smack_from_secid(const u32
);
221 char *smk_parse_smack(const char *string
, int len
);
222 int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr
*, int);
223 char *smk_import(const char *, int);
224 struct smack_known
*smk_import_entry(const char *, int);
225 struct smack_known
*smk_find_entry(const char *);
226 u32
smack_to_secid(const char *);
231 extern int smack_cipso_direct
;
232 extern int smack_cipso_mapped
;
233 extern struct smack_known
*smack_net_ambient
;
234 extern char *smack_onlycap
;
235 extern const char *smack_cipso_option
;
237 extern struct smack_known smack_known_floor
;
238 extern struct smack_known smack_known_hat
;
239 extern struct smack_known smack_known_huh
;
240 extern struct smack_known smack_known_invalid
;
241 extern struct smack_known smack_known_star
;
242 extern struct smack_known smack_known_web
;
244 extern struct mutex smack_known_lock
;
245 extern struct list_head smack_known_list
;
246 extern struct list_head smk_netlbladdr_list
;
248 extern struct security_operations smack_ops
;
251 * Is the directory transmuting?
253 static inline int smk_inode_transmutable(const struct inode
*isp
)
255 struct inode_smack
*sip
= isp
->i_security
;
256 return (sip
->smk_flags
& SMK_INODE_TRANSMUTE
) != 0;
260 * Present a pointer to the smack label in an inode blob.
262 static inline char *smk_of_inode(const struct inode
*isp
)
264 struct inode_smack
*sip
= isp
->i_security
;
265 return sip
->smk_inode
;
269 * Present a pointer to the smack label entry in an task blob.
271 static inline struct smack_known
*smk_of_task(const struct task_smack
*tsp
)
273 return tsp
->smk_task
;
277 * Present a pointer to the forked smack label entry in an task blob.
279 static inline struct smack_known
*smk_of_forked(const struct task_smack
*tsp
)
281 return tsp
->smk_forked
;
285 * Present a pointer to the smack label in the current task blob.
287 static inline struct smack_known
*smk_of_current(void)
289 return smk_of_task(current_security());
293 * Is the task privileged and allowed to be privileged
294 * by the onlycap rule.
296 static inline int smack_privileged(int cap
)
298 struct smack_known
*skp
= smk_of_current();
302 if (smack_onlycap
== NULL
|| smack_onlycap
== skp
->smk_known
)
310 #define SMACK_AUDIT_DENIED 0x1
311 #define SMACK_AUDIT_ACCEPT 0x2
312 extern int log_policy
;
314 void smack_log(char *subject_label
, char *object_label
,
316 int result
, struct smk_audit_info
*auditdata
);
321 * some inline functions to set up audit data
322 * they do nothing if CONFIG_AUDIT is not set
325 static inline void smk_ad_init(struct smk_audit_info
*a
, const char *func
,
328 memset(&a
->sad
, 0, sizeof(a
->sad
));
330 a
->a
.smack_audit_data
= &a
->sad
;
331 a
->a
.smack_audit_data
->function
= func
;
334 static inline void smk_ad_init_net(struct smk_audit_info
*a
, const char *func
,
335 char type
, struct lsm_network_audit
*net
)
337 smk_ad_init(a
, func
, type
);
338 memset(net
, 0, sizeof(*net
));
342 static inline void smk_ad_setfield_u_tsk(struct smk_audit_info
*a
,
343 struct task_struct
*t
)
347 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info
*a
,
352 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info
*a
,
357 static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info
*a
,
362 static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info
*a
,
370 static inline void smk_ad_init(struct smk_audit_info
*a
, const char *func
,
374 static inline void smk_ad_setfield_u_tsk(struct smk_audit_info
*a
,
375 struct task_struct
*t
)
378 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info
*a
,
382 static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info
*a
,
386 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info
*a
,
390 static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info
*a
,
394 static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info
*a
,
400 #endif /* _SECURITY_SMACK_H */