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1 | /* |
2 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
3 | * | |
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. | |
7 | * | |
8 | * Author: | |
9 | * Casey Schaufler <casey@schaufler-ca.com> | |
10 | * | |
11 | */ | |
12 | ||
13 | #ifndef _SECURITY_SMACK_H | |
14 | #define _SECURITY_SMACK_H | |
15 | ||
16 | #include <linux/capability.h> | |
17 | #include <linux/spinlock.h> | |
18 | #include <net/netlabel.h> | |
19 | ||
20 | /* | |
21 | * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is | |
22 | * bigger than can be used, and 24 is the next lower multiple | |
23 | * of 8, and there are too many issues if there isn't space set | |
24 | * aside for the terminating null byte. | |
25 | */ | |
26 | #define SMK_MAXLEN 23 | |
27 | #define SMK_LABELLEN (SMK_MAXLEN+1) | |
28 | ||
e114e473 CS |
29 | struct superblock_smack { |
30 | char *smk_root; | |
31 | char *smk_floor; | |
32 | char *smk_hat; | |
33 | char *smk_default; | |
34 | int smk_initialized; | |
35 | spinlock_t smk_sblock; /* for initialization */ | |
36 | }; | |
37 | ||
38 | struct socket_smack { | |
39 | char *smk_out; /* outbound label */ | |
40 | char *smk_in; /* inbound label */ | |
41 | char smk_packet[SMK_LABELLEN]; /* TCP peer label */ | |
42 | }; | |
43 | ||
44 | /* | |
45 | * Inode smack data | |
46 | */ | |
47 | struct inode_smack { | |
48 | char *smk_inode; /* label of the fso */ | |
49 | struct mutex smk_lock; /* initialization lock */ | |
50 | int smk_flags; /* smack inode flags */ | |
51 | }; | |
52 | ||
53 | #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */ | |
54 | ||
55 | /* | |
56 | * A label access rule. | |
57 | */ | |
58 | struct smack_rule { | |
59 | char *smk_subject; | |
60 | char *smk_object; | |
61 | int smk_access; | |
62 | }; | |
63 | ||
64 | /* | |
65 | * An entry in the table of permitted label accesses. | |
66 | */ | |
67 | struct smk_list_entry { | |
68 | struct smk_list_entry *smk_next; | |
69 | struct smack_rule smk_rule; | |
70 | }; | |
71 | ||
72 | /* | |
73 | * An entry in the table mapping smack values to | |
74 | * CIPSO level/category-set values. | |
75 | */ | |
76 | struct smack_cipso { | |
77 | int smk_level; | |
78 | char smk_catset[SMK_LABELLEN]; | |
79 | }; | |
80 | ||
81 | /* | |
82 | * This is the repository for labels seen so that it is | |
83 | * not necessary to keep allocating tiny chuncks of memory | |
84 | * and so that they can be shared. | |
85 | * | |
86 | * Labels are never modified in place. Anytime a label | |
87 | * is imported (e.g. xattrset on a file) the list is checked | |
88 | * for it and it is added if it doesn't exist. The address | |
89 | * is passed out in either case. Entries are added, but | |
90 | * never deleted. | |
91 | * | |
92 | * Since labels are hanging around anyway it doesn't | |
93 | * hurt to maintain a secid for those awkward situations | |
94 | * where kernel components that ought to use LSM independent | |
95 | * interfaces don't. The secid should go away when all of | |
96 | * these components have been repaired. | |
97 | * | |
98 | * If there is a cipso value associated with the label it | |
99 | * gets stored here, too. This will most likely be rare as | |
100 | * the cipso direct mapping in used internally. | |
101 | */ | |
102 | struct smack_known { | |
103 | struct smack_known *smk_next; | |
104 | char smk_known[SMK_LABELLEN]; | |
105 | u32 smk_secid; | |
106 | struct smack_cipso *smk_cipso; | |
107 | spinlock_t smk_cipsolock; /* for changing cipso map */ | |
108 | }; | |
109 | ||
110 | /* | |
111 | * Mount options | |
112 | */ | |
113 | #define SMK_FSDEFAULT "smackfsdef=" | |
114 | #define SMK_FSFLOOR "smackfsfloor=" | |
115 | #define SMK_FSHAT "smackfshat=" | |
116 | #define SMK_FSROOT "smackfsroot=" | |
117 | ||
118 | /* | |
119 | * xattr names | |
120 | */ | |
121 | #define XATTR_SMACK_SUFFIX "SMACK64" | |
122 | #define XATTR_SMACK_IPIN "SMACK64IPIN" | |
123 | #define XATTR_SMACK_IPOUT "SMACK64IPOUT" | |
124 | #define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX | |
125 | #define XATTR_NAME_SMACKIPIN XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN | |
126 | #define XATTR_NAME_SMACKIPOUT XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT | |
127 | ||
128 | /* | |
129 | * smackfs macic number | |
130 | */ | |
131 | #define SMACK_MAGIC 0x43415d53 /* "SMAC" */ | |
132 | ||
133 | /* | |
134 | * A limit on the number of entries in the lists | |
135 | * makes some of the list administration easier. | |
136 | */ | |
137 | #define SMACK_LIST_MAX 10000 | |
138 | ||
139 | /* | |
140 | * CIPSO defaults. | |
141 | */ | |
142 | #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */ | |
143 | #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */ | |
144 | #define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */ | |
145 | #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */ | |
146 | #define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */ | |
147 | ||
148 | /* | |
149 | * Just to make the common cases easier to deal with | |
150 | */ | |
151 | #define MAY_ANY (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC) | |
152 | #define MAY_ANYREAD (MAY_READ | MAY_EXEC) | |
153 | #define MAY_ANYWRITE (MAY_WRITE | MAY_APPEND) | |
154 | #define MAY_READWRITE (MAY_READ | MAY_WRITE) | |
155 | #define MAY_NOT 0 | |
156 | ||
157 | /* | |
158 | * These functions are in smack_lsm.c | |
159 | */ | |
160 | struct inode_smack *new_inode_smack(char *); | |
161 | ||
162 | /* | |
163 | * These functions are in smack_access.c | |
164 | */ | |
165 | int smk_access(char *, char *, int); | |
166 | int smk_curacc(char *, u32); | |
167 | int smack_to_cipso(const char *, struct smack_cipso *); | |
168 | void smack_from_cipso(u32, char *, char *); | |
169 | char *smack_from_secid(const u32); | |
170 | char *smk_import(const char *, int); | |
171 | struct smack_known *smk_import_entry(const char *, int); | |
172 | u32 smack_to_secid(const char *); | |
173 | ||
174 | /* | |
175 | * Shared data. | |
176 | */ | |
177 | extern int smack_cipso_direct; | |
178 | extern int smack_net_nltype; | |
179 | extern char *smack_net_ambient; | |
180 | ||
181 | extern struct smack_known *smack_known; | |
182 | extern struct smack_known smack_known_floor; | |
183 | extern struct smack_known smack_known_hat; | |
184 | extern struct smack_known smack_known_huh; | |
185 | extern struct smack_known smack_known_invalid; | |
186 | extern struct smack_known smack_known_star; | |
187 | extern struct smack_known smack_known_unset; | |
188 | ||
189 | extern struct smk_list_entry *smack_list; | |
190 | ||
191 | /* | |
192 | * Stricly for CIPSO level manipulation. | |
193 | * Set the category bit number in a smack label sized buffer. | |
194 | */ | |
195 | static inline void smack_catset_bit(int cat, char *catsetp) | |
196 | { | |
197 | if (cat > SMK_LABELLEN * 8) | |
198 | return; | |
199 | ||
200 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); | |
201 | } | |
202 | ||
203 | /* | |
204 | * Present a pointer to the smack label in an inode blob. | |
205 | */ | |
206 | static inline char *smk_of_inode(const struct inode *isp) | |
207 | { | |
208 | struct inode_smack *sip = isp->i_security; | |
209 | return sip->smk_inode; | |
210 | } | |
211 | ||
212 | #endif /* _SECURITY_SMACK_H */ |