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 */