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 * Maximum number of bytes for the levels in a CIPSO IP option.
33 * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
34 * bigger than can be used, and 24 is the next lower multiple
35 * of 8, and there are too many issues if there isn't space set
36 * aside for the terminating null byte.
38 #define SMK_CIPSOLEN 24
40 struct superblock_smack {
49 char *smk_out; /* outbound label */
50 char *smk_in; /* inbound label */
51 char *smk_packet; /* TCP peer label */
58 char *smk_inode; /* label of the fso */
59 char *smk_task; /* label of the task */
60 char *smk_mmap; /* label of the mmap domain */
61 struct mutex smk_lock; /* initialization lock */
62 int smk_flags; /* smack inode flags */
66 char *smk_task; /* label for access control */
67 char *smk_forked; /* label when forked */
68 struct list_head smk_rules; /* per task access rules */
69 struct mutex smk_rules_lock; /* lock for the rules */
72 #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
73 #define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
74 #define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
77 * A label access rule.
80 struct list_head list;
87 * An entry in the table identifying hosts.
89 struct smk_netlbladdr {
90 struct list_head list;
91 struct sockaddr_in smk_host; /* network address */
92 struct in_addr smk_mask; /* network mask */
93 char *smk_label; /* label */
97 * This is the repository for labels seen so that it is
98 * not necessary to keep allocating tiny chuncks of memory
99 * and so that they can be shared.
101 * Labels are never modified in place. Anytime a label
102 * is imported (e.g. xattrset on a file) the list is checked
103 * for it and it is added if it doesn't exist. The address
104 * is passed out in either case. Entries are added, but
107 * Since labels are hanging around anyway it doesn't
108 * hurt to maintain a secid for those awkward situations
109 * where kernel components that ought to use LSM independent
110 * interfaces don't. The secid should go away when all of
111 * these components have been repaired.
113 * The cipso value associated with the label gets stored here, too.
115 * Keep the access rules for this subject label here so that
116 * the entire set of rules does not need to be examined every
120 struct list_head list;
123 struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */
124 struct list_head smk_rules; /* access rules */
125 struct mutex smk_rules_lock; /* lock for rules */
131 #define SMK_FSDEFAULT "smackfsdef="
132 #define SMK_FSFLOOR "smackfsfloor="
133 #define SMK_FSHAT "smackfshat="
134 #define SMK_FSROOT "smackfsroot="
136 #define SMACK_CIPSO_OPTION "-CIPSO"
139 * How communications on this socket are treated.
140 * Usually it's determined by the underlying netlabel code
141 * but there are certain cases, including single label hosts
142 * and potentially single label interfaces for which the
143 * treatment can not be known in advance.
145 * The possibility of additional labeling schemes being
146 * introduced in the future exists as well.
148 #define SMACK_UNLABELED_SOCKET 0
149 #define SMACK_CIPSO_SOCKET 1
154 #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
155 #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
156 #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
157 #define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
158 #define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
159 #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
160 #define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
163 * Flag for transmute access
165 #define MAY_TRANSMUTE 64
167 * Just to make the common cases easier to deal with
169 #define MAY_ANYREAD (MAY_READ | MAY_EXEC)
170 #define MAY_READWRITE (MAY_READ | MAY_WRITE)
174 * Number of access types used by Smack (rwxat)
176 #define SMK_NUM_ACCESS_TYPE 5
179 struct smack_audit_data {
180 const char *function;
188 * Smack audit data; is empty if CONFIG_AUDIT not set
191 struct smk_audit_info {
193 struct common_audit_data a;
194 struct smack_audit_data sad;
198 * These functions are in smack_lsm.c
200 struct inode_smack *new_inode_smack(char *);
203 * These functions are in smack_access.c
205 int smk_access_entry(char *, char *, struct list_head *);
206 int smk_access(char *, char *, int, struct smk_audit_info *);
207 int smk_curacc(char *, u32, struct smk_audit_info *);
208 char *smack_from_secid(const u32);
209 char *smk_parse_smack(const char *string, int len);
210 int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
211 char *smk_import(const char *, int);
212 struct smack_known *smk_import_entry(const char *, int);
213 struct smack_known *smk_find_entry(const char *);
214 u32 smack_to_secid(const char *);
219 extern int smack_cipso_direct;
220 extern int smack_cipso_mapped;
221 extern char *smack_net_ambient;
222 extern char *smack_onlycap;
223 extern const char *smack_cipso_option;
225 extern struct smack_known smack_known_floor;
226 extern struct smack_known smack_known_hat;
227 extern struct smack_known smack_known_huh;
228 extern struct smack_known smack_known_invalid;
229 extern struct smack_known smack_known_star;
230 extern struct smack_known smack_known_web;
232 extern struct mutex smack_known_lock;
233 extern struct list_head smack_known_list;
234 extern struct list_head smk_netlbladdr_list;
236 extern struct security_operations smack_ops;
239 * Is the directory transmuting?
241 static inline int smk_inode_transmutable(const struct inode *isp)
243 struct inode_smack *sip = isp->i_security;
244 return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
248 * Present a pointer to the smack label in an inode blob.
250 static inline char *smk_of_inode(const struct inode *isp)
252 struct inode_smack *sip = isp->i_security;
253 return sip->smk_inode;
257 * Present a pointer to the smack label in an task blob.
259 static inline char *smk_of_task(const struct task_smack *tsp)
261 return tsp->smk_task;
265 * Present a pointer to the forked smack label in an task blob.
267 static inline char *smk_of_forked(const struct task_smack *tsp)
269 return tsp->smk_forked;
273 * Present a pointer to the smack label in the current task blob.
275 static inline char *smk_of_current(void)
277 return smk_of_task(current_security());
281 * Is the task privileged and allowed to be privileged
282 * by the onlycap rule.
284 static inline int smack_privileged(int cap)
288 if (smack_onlycap == NULL || smack_onlycap == smk_of_current())
296 #define SMACK_AUDIT_DENIED 0x1
297 #define SMACK_AUDIT_ACCEPT 0x2
298 extern int log_policy;
300 void smack_log(char *subject_label, char *object_label,
302 int result, struct smk_audit_info *auditdata);
307 * some inline functions to set up audit data
308 * they do nothing if CONFIG_AUDIT is not set
311 static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
314 memset(&a->sad, 0, sizeof(a->sad));
316 a->a.smack_audit_data = &a->sad;
317 a->a.smack_audit_data->function = func;
320 static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
321 char type, struct lsm_network_audit *net)
323 smk_ad_init(a, func, type);
324 memset(net, 0, sizeof(*net));
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 */