1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
6 * Casey Schaufler <casey@schaufler-ca.com>
9 #ifndef _SECURITY_SMACK_H
10 #define _SECURITY_SMACK_H
12 #include <linux/capability.h>
13 #include <linux/spinlock.h>
14 #include <linux/lsm_hooks.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>
26 * Use IPv6 port labeling if IPv6 is enabled and secmarks
29 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
30 #define SMACK_IPV6_PORT_LABELING 1
33 #if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER)
34 #define SMACK_IPV6_SECMARK_LABELING 1
38 * Smack labels were limited to 23 characters for a long time.
40 #define SMK_LABELLEN 24
41 #define SMK_LONGLABEL 256
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.
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
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.
60 * The cipso value associated with the label gets stored here, too.
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
67 struct list_head list
;
68 struct hlist_node smk_hashed
;
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 */
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.
83 #define SMK_CIPSOLEN 24
85 struct 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
;
96 #define SMK_SB_INITIALIZED 0x01
97 #define SMK_SB_UNTRUSTED 0x02
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 int smk_state
; /* netlabel socket states */
105 #define SMK_NETLBL_UNSET 0
106 #define SMK_NETLBL_UNLABELED 1
107 #define SMK_NETLBL_LABELED 2
108 #define SMK_NETLBL_REQSKB 3
114 struct smack_known
*smk_inode
; /* label of the fso */
115 struct smack_known
*smk_task
; /* label of the task */
116 struct smack_known
*smk_mmap
; /* label of the mmap domain */
117 int smk_flags
; /* smack inode flags */
121 struct smack_known
*smk_task
; /* label for access control */
122 struct smack_known
*smk_forked
; /* label when forked */
123 struct list_head smk_rules
; /* per task access rules */
124 struct mutex smk_rules_lock
; /* lock for the rules */
125 struct list_head smk_relabel
; /* transit allowed labels */
128 #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
129 #define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
130 #define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
131 #define SMK_INODE_IMPURE 0x08 /* involved in an impure transaction */
134 * A label access rule.
137 struct list_head list
;
138 struct smack_known
*smk_subject
;
139 struct smack_known
*smk_object
;
144 * An entry in the table identifying IPv4 hosts.
146 struct smk_net4addr
{
147 struct list_head list
;
148 struct in_addr smk_host
; /* network address */
149 struct in_addr smk_mask
; /* network mask */
150 int smk_masks
; /* mask size */
151 struct smack_known
*smk_label
; /* label */
155 * An entry in the table identifying IPv6 hosts.
157 struct smk_net6addr
{
158 struct list_head list
;
159 struct in6_addr smk_host
; /* network address */
160 struct in6_addr smk_mask
; /* network mask */
161 int smk_masks
; /* mask size */
162 struct smack_known
*smk_label
; /* label */
166 * An entry in the table identifying ports.
168 struct 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 */
178 struct smack_known_list_elem
{
179 struct list_head list
;
180 struct smack_known
*smk_label
;
183 /* Super block security struct flags for mount options */
184 #define FSDEFAULT_MNT 0x01
185 #define FSFLOOR_MNT 0x02
186 #define FSHAT_MNT 0x04
187 #define FSROOT_MNT 0x08
188 #define FSTRANS_MNT 0x10
190 #define NUM_SMK_MNT_OPTS 5
201 #define SMACK_DELETE_OPTION "-DELETE"
202 #define SMACK_CIPSO_OPTION "-CIPSO"
207 #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
208 #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
209 #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
210 #define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
211 #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
213 * CIPSO 2.2 standard is 239, but Smack wants to use the
214 * categories in a structured way that limits the value to
215 * the bits in 23 bytes, hence the unusual number.
217 #define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */
222 #define SMACK_PTRACE_DEFAULT 0
223 #define SMACK_PTRACE_EXACT 1
224 #define SMACK_PTRACE_DRACONIAN 2
225 #define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN
228 * Flags for untraditional access modes.
229 * It shouldn't be necessary to avoid conflicts with definitions
230 * in fs.h, but do so anyway.
232 #define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */
233 #define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */
234 #define MAY_BRINGUP 0x00004000 /* Report use of this rule */
237 * The policy for delivering signals is configurable.
238 * It is usually "write", but can be "append".
240 #ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS
241 #define MAY_DELIVER MAY_APPEND /* Signal delivery requires append */
243 #define MAY_DELIVER MAY_WRITE /* Signal delivery requires write */
246 #define SMACK_BRINGUP_ALLOW 1 /* Allow bringup mode */
247 #define SMACK_UNCONFINED_SUBJECT 2 /* Allow unconfined label */
248 #define SMACK_UNCONFINED_OBJECT 3 /* Allow unconfined label */
251 * Just to make the common cases easier to deal with
253 #define MAY_ANYREAD (MAY_READ | MAY_EXEC)
254 #define MAY_READWRITE (MAY_READ | MAY_WRITE)
258 * Number of access types used by Smack (rwxatlb)
260 #define SMK_NUM_ACCESS_TYPE 7
263 struct smack_audit_data
{
264 const char *function
;
272 * Smack audit data; is empty if CONFIG_AUDIT not set
275 struct smk_audit_info
{
277 struct common_audit_data a
;
278 struct smack_audit_data sad
;
283 * These functions are in smack_access.c
285 int smk_access_entry(char *, char *, struct list_head
*);
286 int smk_access(struct smack_known
*, struct smack_known
*,
287 int, struct smk_audit_info
*);
288 int smk_tskacc(struct task_smack
*, struct smack_known
*,
289 u32
, struct smk_audit_info
*);
290 int smk_curacc(struct smack_known
*, u32
, struct smk_audit_info
*);
291 struct smack_known
*smack_from_secid(const u32
);
292 char *smk_parse_smack(const char *string
, int len
);
293 int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr
*, int);
294 struct smack_known
*smk_import_entry(const char *, int);
295 void smk_insert_entry(struct smack_known
*skp
);
296 struct smack_known
*smk_find_entry(const char *);
297 bool smack_privileged(int cap
);
298 bool smack_privileged_cred(int cap
, const struct cred
*cred
);
299 void smk_destroy_label_list(struct list_head
*list
);
300 int smack_populate_secattr(struct smack_known
*skp
);
305 extern int smack_enabled __initdata
;
306 extern int smack_cipso_direct
;
307 extern int smack_cipso_mapped
;
308 extern struct smack_known
*smack_net_ambient
;
309 extern struct smack_known
*smack_syslog_label
;
310 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
311 extern struct smack_known
*smack_unconfined
;
313 extern int smack_ptrace_rule
;
314 extern struct lsm_blob_sizes smack_blob_sizes
;
316 extern struct smack_known smack_known_floor
;
317 extern struct smack_known smack_known_hat
;
318 extern struct smack_known smack_known_huh
;
319 extern struct smack_known smack_known_star
;
320 extern struct smack_known smack_known_web
;
322 extern struct mutex smack_known_lock
;
323 extern struct list_head smack_known_list
;
324 extern struct list_head smk_net4addr_list
;
325 extern struct list_head smk_net6addr_list
;
327 extern struct mutex smack_onlycap_lock
;
328 extern struct list_head smack_onlycap_list
;
330 #define SMACK_HASH_SLOTS 16
331 extern struct hlist_head smack_known_hash
[SMACK_HASH_SLOTS
];
332 extern struct kmem_cache
*smack_rule_cache
;
334 static inline struct task_smack
*smack_cred(const struct cred
*cred
)
336 return cred
->security
+ smack_blob_sizes
.lbs_cred
;
339 static inline struct smack_known
**smack_file(const struct file
*file
)
341 return (struct smack_known
**)(file
->f_security
+
342 smack_blob_sizes
.lbs_file
);
345 static inline struct inode_smack
*smack_inode(const struct inode
*inode
)
347 return inode
->i_security
+ smack_blob_sizes
.lbs_inode
;
350 static inline struct smack_known
**smack_msg_msg(const struct msg_msg
*msg
)
352 return msg
->security
+ smack_blob_sizes
.lbs_msg_msg
;
355 static inline struct smack_known
**smack_ipc(const struct kern_ipc_perm
*ipc
)
357 return ipc
->security
+ smack_blob_sizes
.lbs_ipc
;
360 static inline struct superblock_smack
*smack_superblock(
361 const struct super_block
*superblock
)
363 return superblock
->s_security
+ smack_blob_sizes
.lbs_superblock
;
367 * Is the directory transmuting?
369 static inline int smk_inode_transmutable(const struct inode
*isp
)
371 struct inode_smack
*sip
= smack_inode(isp
);
372 return (sip
->smk_flags
& SMK_INODE_TRANSMUTE
) != 0;
376 * Present a pointer to the smack label entry in an inode blob.
378 static inline struct smack_known
*smk_of_inode(const struct inode
*isp
)
380 struct inode_smack
*sip
= smack_inode(isp
);
381 return sip
->smk_inode
;
385 * Present a pointer to the smack label entry in an task blob.
387 static inline struct smack_known
*smk_of_task(const struct task_smack
*tsp
)
389 return tsp
->smk_task
;
392 static inline struct smack_known
*smk_of_task_struct_subj(
393 const struct task_struct
*t
)
395 struct smack_known
*skp
;
396 const struct cred
*cred
;
400 cred
= rcu_dereference(t
->cred
);
401 skp
= smk_of_task(smack_cred(cred
));
408 static inline struct smack_known
*smk_of_task_struct_obj(
409 const struct task_struct
*t
)
411 struct smack_known
*skp
;
412 const struct cred
*cred
;
416 cred
= __task_cred(t
);
417 skp
= smk_of_task(smack_cred(cred
));
425 * Present a pointer to the forked smack label entry in an task blob.
427 static inline struct smack_known
*smk_of_forked(const struct task_smack
*tsp
)
429 return tsp
->smk_forked
;
433 * Present a pointer to the smack label in the current task blob.
435 static inline struct smack_known
*smk_of_current(void)
437 return smk_of_task(smack_cred(current_cred()));
443 #define SMACK_AUDIT_DENIED 0x1
444 #define SMACK_AUDIT_ACCEPT 0x2
445 extern int log_policy
;
447 void smack_log(char *subject_label
, char *object_label
,
449 int result
, struct smk_audit_info
*auditdata
);
454 * some inline functions to set up audit data
455 * they do nothing if CONFIG_AUDIT is not set
458 static inline void smk_ad_init(struct smk_audit_info
*a
, const char *func
,
461 memset(&a
->sad
, 0, sizeof(a
->sad
));
463 a
->a
.smack_audit_data
= &a
->sad
;
464 a
->a
.smack_audit_data
->function
= func
;
467 static inline void smk_ad_init_net(struct smk_audit_info
*a
, const char *func
,
468 char type
, struct lsm_network_audit
*net
)
470 smk_ad_init(a
, func
, type
);
471 memset(net
, 0, sizeof(*net
));
475 static inline void smk_ad_setfield_u_tsk(struct smk_audit_info
*a
,
476 struct task_struct
*t
)
480 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info
*a
,
485 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info
*a
,
490 static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info
*a
,
495 static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info
*a
,
503 static inline void smk_ad_init(struct smk_audit_info
*a
, const char *func
,
507 static inline void smk_ad_setfield_u_tsk(struct smk_audit_info
*a
,
508 struct task_struct
*t
)
511 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info
*a
,
515 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info
*a
,
519 static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info
*a
,
523 static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info
*a
,
529 #endif /* _SECURITY_SMACK_H */