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>
25 * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
26 * bigger than can be used, and 24 is the next lower multiple
27 * of 8, and there are too many issues if there isn't space set
28 * aside for the terminating null byte.
31 #define SMK_LABELLEN (SMK_MAXLEN+1)
33 struct superblock_smack {
39 spinlock_t smk_sblock; /* for initialization */
43 char *smk_out; /* outbound label */
44 char *smk_in; /* inbound label */
45 int smk_labeled; /* label scheme */
46 char smk_packet[SMK_LABELLEN]; /* TCP peer label */
53 char *smk_inode; /* label of the fso */
54 struct mutex smk_lock; /* initialization lock */
55 int smk_flags; /* smack inode flags */
58 #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
61 * A label access rule.
64 struct list_head list;
71 * An entry in the table mapping smack values to
72 * CIPSO level/category-set values.
76 char smk_catset[SMK_LABELLEN];
80 * An entry in the table identifying hosts.
82 struct smk_netlbladdr {
83 struct list_head list;
84 struct sockaddr_in smk_host; /* network address */
85 struct in_addr smk_mask; /* network mask */
86 char *smk_label; /* label */
90 * This is the repository for labels seen so that it is
91 * not necessary to keep allocating tiny chuncks of memory
92 * and so that they can be shared.
94 * Labels are never modified in place. Anytime a label
95 * is imported (e.g. xattrset on a file) the list is checked
96 * for it and it is added if it doesn't exist. The address
97 * is passed out in either case. Entries are added, but
100 * Since labels are hanging around anyway it doesn't
101 * hurt to maintain a secid for those awkward situations
102 * where kernel components that ought to use LSM independent
103 * interfaces don't. The secid should go away when all of
104 * these components have been repaired.
106 * If there is a cipso value associated with the label it
107 * gets stored here, too. This will most likely be rare as
108 * the cipso direct mapping in used internally.
111 struct list_head list;
112 char smk_known[SMK_LABELLEN];
114 struct smack_cipso *smk_cipso;
115 spinlock_t smk_cipsolock; /* for changing cipso map */
121 #define SMK_FSDEFAULT "smackfsdef="
122 #define SMK_FSFLOOR "smackfsfloor="
123 #define SMK_FSHAT "smackfshat="
124 #define SMK_FSROOT "smackfsroot="
129 #define XATTR_SMACK_SUFFIX "SMACK64"
130 #define XATTR_SMACK_IPIN "SMACK64IPIN"
131 #define XATTR_SMACK_IPOUT "SMACK64IPOUT"
132 #define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX
133 #define XATTR_NAME_SMACKIPIN XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN
134 #define XATTR_NAME_SMACKIPOUT XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT
137 * How communications on this socket are treated.
138 * Usually it's determined by the underlying netlabel code
139 * but there are certain cases, including single label hosts
140 * and potentially single label interfaces for which the
141 * treatment can not be known in advance.
143 * The possibility of additional labeling schemes being
144 * introduced in the future exists as well.
146 #define SMACK_UNLABELED_SOCKET 0
147 #define SMACK_CIPSO_SOCKET 1
150 * smackfs magic number
151 * smackfs macic number
153 #define SMACK_MAGIC 0x43415d53 /* "SMAC" */
156 * A limit on the number of entries in the lists
157 * makes some of the list administration easier.
159 #define SMACK_LIST_MAX 10000
164 #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
165 #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
166 #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
167 #define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
168 #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
169 #define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
172 * Just to make the common cases easier to deal with
174 #define MAY_ANY (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
175 #define MAY_ANYREAD (MAY_READ | MAY_EXEC)
176 #define MAY_ANYWRITE (MAY_WRITE | MAY_APPEND)
177 #define MAY_READWRITE (MAY_READ | MAY_WRITE)
181 * These functions are in smack_lsm.c
183 struct inode_smack *new_inode_smack(char *);
186 * These functions are in smack_access.c
188 int smk_access(char *, char *, int);
189 int smk_curacc(char *, u32);
190 int smack_to_cipso(const char *, struct smack_cipso *);
191 void smack_from_cipso(u32, char *, char *);
192 char *smack_from_secid(const u32);
193 char *smk_import(const char *, int);
194 struct smack_known *smk_import_entry(const char *, int);
195 u32 smack_to_secid(const char *);
200 extern int smack_cipso_direct;
201 extern char *smack_net_ambient;
202 extern char *smack_onlycap;
204 extern struct smack_known smack_known_floor;
205 extern struct smack_known smack_known_hat;
206 extern struct smack_known smack_known_huh;
207 extern struct smack_known smack_known_invalid;
208 extern struct smack_known smack_known_star;
209 extern struct smack_known smack_known_web;
211 extern struct list_head smack_known_list;
212 extern struct list_head smack_rule_list;
213 extern struct list_head smk_netlbladdr_list;
215 extern struct security_operations smack_ops;
218 * Stricly for CIPSO level manipulation.
219 * Set the category bit number in a smack label sized buffer.
221 static inline void smack_catset_bit(int cat, char *catsetp)
223 if (cat > SMK_LABELLEN * 8)
226 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
230 * Present a pointer to the smack label in an inode blob.
232 static inline char *smk_of_inode(const struct inode *isp)
234 struct inode_smack *sip = isp->i_security;
235 return sip->smk_inode;
238 #endif /* _SECURITY_SMACK_H */