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;
56 struct hlist_node smk_hashed;
59 struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */
60 struct list_head smk_rules; /* access rules */
61 struct mutex smk_rules_lock; /* lock for rules */
65 * Maximum number of bytes for the levels in a CIPSO IP option.
66 * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
67 * bigger than can be used, and 24 is the next lower multiple
68 * of 8, and there are too many issues if there isn't space set
69 * aside for the terminating null byte.
71 #define SMK_CIPSOLEN 24
73 struct superblock_smack {
82 struct smack_known *smk_out; /* outbound label */
83 char *smk_in; /* inbound label */
84 char *smk_packet; /* TCP peer label */
91 char *smk_inode; /* label of the fso */
92 struct smack_known *smk_task; /* label of the task */
93 struct smack_known *smk_mmap; /* label of the mmap domain */
94 struct mutex smk_lock; /* initialization lock */
95 int smk_flags; /* smack inode flags */
99 struct smack_known *smk_task; /* label for access control */
100 struct smack_known *smk_forked; /* label when forked */
101 struct list_head smk_rules; /* per task access rules */
102 struct mutex smk_rules_lock; /* lock for the rules */
105 #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
106 #define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
107 #define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
110 * A label access rule.
113 struct list_head list;
114 struct smack_known *smk_subject;
120 * An entry in the table identifying hosts.
122 struct smk_netlbladdr {
123 struct list_head list;
124 struct sockaddr_in smk_host; /* network address */
125 struct in_addr smk_mask; /* network mask */
126 char *smk_label; /* label */
130 * An entry in the table identifying ports.
132 struct smk_port_label {
133 struct list_head list;
134 struct sock *smk_sock; /* socket initialized on */
135 unsigned short smk_port; /* the port number */
136 char *smk_in; /* incoming label */
137 struct smack_known *smk_out; /* outgoing label */
143 #define SMK_FSDEFAULT "smackfsdef="
144 #define SMK_FSFLOOR "smackfsfloor="
145 #define SMK_FSHAT "smackfshat="
146 #define SMK_FSROOT "smackfsroot="
147 #define SMK_FSTRANS "smackfstransmute="
149 #define SMACK_CIPSO_OPTION "-CIPSO"
152 * How communications on this socket are treated.
153 * Usually it's determined by the underlying netlabel code
154 * but there are certain cases, including single label hosts
155 * and potentially single label interfaces for which the
156 * treatment can not be known in advance.
158 * The possibility of additional labeling schemes being
159 * introduced in the future exists as well.
161 #define SMACK_UNLABELED_SOCKET 0
162 #define SMACK_CIPSO_SOCKET 1
165 * smackfs magic number
167 #define SMACK_MAGIC 0x43415d53 /* "SMAC" */
172 #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
173 #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
174 #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
175 #define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
176 #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
178 * CIPSO 2.2 standard is 239, but Smack wants to use the
179 * categories in a structured way that limits the value to
180 * the bits in 23 bytes, hence the unusual number.
182 #define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */
185 * Flags for untraditional access modes.
186 * It shouldn't be necessary to avoid conflicts with definitions
187 * in fs.h, but do so anyway.
189 #define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */
190 #define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */
193 * Just to make the common cases easier to deal with
195 #define MAY_ANYREAD (MAY_READ | MAY_EXEC)
196 #define MAY_READWRITE (MAY_READ | MAY_WRITE)
200 * Number of access types used by Smack (rwxatl)
202 #define SMK_NUM_ACCESS_TYPE 6
205 * Smack audit data; is empty if CONFIG_AUDIT not set
208 struct smk_audit_info {
210 struct common_audit_data a;
214 struct smack_master_list {
215 struct list_head list;
216 struct smack_rule *smk_rule;
220 * These functions are in smack_lsm.c
222 struct inode_smack *new_inode_smack(char *);
225 * These functions are in smack_access.c
227 int smk_access_entry(char *, char *, struct list_head *);
228 int smk_access(struct smack_known *, char *, int, struct smk_audit_info *);
229 int smk_curacc(char *, u32, struct smk_audit_info *);
230 struct smack_known *smack_from_secid(const u32);
231 char *smk_parse_smack(const char *string, int len);
232 int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
233 char *smk_import(const char *, int);
234 struct smack_known *smk_import_entry(const char *, int);
235 void smk_insert_entry(struct smack_known *skp);
236 struct smack_known *smk_find_entry(const char *);
237 u32 smack_to_secid(const char *);
242 extern int smack_cipso_direct;
243 extern int smack_cipso_mapped;
244 extern struct smack_known *smack_net_ambient;
245 extern char *smack_onlycap;
246 extern const char *smack_cipso_option;
248 extern struct smack_known smack_known_floor;
249 extern struct smack_known smack_known_hat;
250 extern struct smack_known smack_known_huh;
251 extern struct smack_known smack_known_invalid;
252 extern struct smack_known smack_known_star;
253 extern struct smack_known smack_known_web;
255 extern struct mutex smack_known_lock;
256 extern struct list_head smack_known_list;
257 extern struct list_head smk_netlbladdr_list;
259 /* Cache for fast and thrifty allocations */
260 extern struct kmem_cache *smack_rule_cache;
261 extern struct kmem_cache *smack_master_list_cache;
263 extern struct security_operations smack_ops;
265 #define SMACK_HASH_SLOTS 16
266 extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
269 * Is the directory transmuting?
271 static inline int smk_inode_transmutable(const struct inode *isp)
273 struct inode_smack *sip = isp->i_security;
274 return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
278 * Present a pointer to the smack label in an inode blob.
280 static inline char *smk_of_inode(const struct inode *isp)
282 struct inode_smack *sip = isp->i_security;
283 return sip->smk_inode;
287 * Present a pointer to the smack label entry in an task blob.
289 static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
291 return tsp->smk_task;
295 * Present a pointer to the forked smack label entry in an task blob.
297 static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
299 return tsp->smk_forked;
303 * Present a pointer to the smack label in the current task blob.
305 static inline struct smack_known *smk_of_current(void)
307 return smk_of_task(current_security());
311 * Is the task privileged and allowed to be privileged
312 * by the onlycap rule.
314 static inline int smack_privileged(int cap)
316 struct smack_known *skp = smk_of_current();
320 if (smack_onlycap == NULL || smack_onlycap == skp->smk_known)
325 #ifdef CONFIG_SECURITY_SMACK_PERMISSIVE_MODE
329 #define SMACK_PERMISSIVE_DENIED 0x0
330 #define SMACK_PERMISSIVE_ALLOWED 0x1
331 extern int permissive_mode;
337 #define SMACK_AUDIT_DENIED 0x1
338 #define SMACK_AUDIT_ACCEPT 0x2
339 extern int log_policy;
341 void smack_log(char *subject_label, char *object_label,
343 int result, struct smk_audit_info *auditdata);
348 * some inline functions to set up audit data
349 * they do nothing if CONFIG_AUDIT is not set
352 static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
355 memset(a, 0, sizeof(*a));
357 a->a.smack_audit_data.function = func;
360 static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
361 struct task_struct *t)
365 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
370 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
375 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,
388 static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
392 static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
393 struct task_struct *t)
396 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
400 static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
404 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
408 static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
412 static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
418 #endif /* _SECURITY_SMACK_H */