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e114e473 CS |
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> | |
076c54c5 | 18 | #include <linux/security.h> |
6d3dc07c | 19 | #include <linux/in.h> |
e114e473 | 20 | #include <net/netlabel.h> |
7198e2ee EB |
21 | #include <linux/list.h> |
22 | #include <linux/rculist.h> | |
e114e473 CS |
23 | |
24 | /* | |
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. | |
29 | */ | |
30 | #define SMK_MAXLEN 23 | |
31 | #define SMK_LABELLEN (SMK_MAXLEN+1) | |
32 | ||
e114e473 CS |
33 | struct superblock_smack { |
34 | char *smk_root; | |
35 | char *smk_floor; | |
36 | char *smk_hat; | |
37 | char *smk_default; | |
38 | int smk_initialized; | |
39 | spinlock_t smk_sblock; /* for initialization */ | |
40 | }; | |
41 | ||
42 | struct socket_smack { | |
43 | char *smk_out; /* outbound label */ | |
44 | char *smk_in; /* inbound label */ | |
45 | char smk_packet[SMK_LABELLEN]; /* TCP peer label */ | |
46 | }; | |
47 | ||
48 | /* | |
49 | * Inode smack data | |
50 | */ | |
51 | struct inode_smack { | |
52 | char *smk_inode; /* label of the fso */ | |
53 | struct mutex smk_lock; /* initialization lock */ | |
54 | int smk_flags; /* smack inode flags */ | |
55 | }; | |
56 | ||
57 | #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */ | |
58 | ||
59 | /* | |
60 | * A label access rule. | |
61 | */ | |
62 | struct smack_rule { | |
7198e2ee EB |
63 | struct list_head list; |
64 | char *smk_subject; | |
65 | char *smk_object; | |
66 | int smk_access; | |
e114e473 CS |
67 | }; |
68 | ||
69 | /* | |
70 | * An entry in the table mapping smack values to | |
71 | * CIPSO level/category-set values. | |
72 | */ | |
73 | struct smack_cipso { | |
74 | int smk_level; | |
75 | char smk_catset[SMK_LABELLEN]; | |
76 | }; | |
77 | ||
6d3dc07c CS |
78 | /* |
79 | * An entry in the table identifying hosts. | |
80 | */ | |
81 | struct smk_netlbladdr { | |
7198e2ee | 82 | struct list_head list; |
6d3dc07c CS |
83 | struct sockaddr_in smk_host; /* network address */ |
84 | struct in_addr smk_mask; /* network mask */ | |
85 | char *smk_label; /* label */ | |
86 | }; | |
87 | ||
e114e473 CS |
88 | /* |
89 | * This is the repository for labels seen so that it is | |
90 | * not necessary to keep allocating tiny chuncks of memory | |
91 | * and so that they can be shared. | |
92 | * | |
93 | * Labels are never modified in place. Anytime a label | |
94 | * is imported (e.g. xattrset on a file) the list is checked | |
95 | * for it and it is added if it doesn't exist. The address | |
96 | * is passed out in either case. Entries are added, but | |
97 | * never deleted. | |
98 | * | |
99 | * Since labels are hanging around anyway it doesn't | |
100 | * hurt to maintain a secid for those awkward situations | |
101 | * where kernel components that ought to use LSM independent | |
102 | * interfaces don't. The secid should go away when all of | |
103 | * these components have been repaired. | |
104 | * | |
105 | * If there is a cipso value associated with the label it | |
106 | * gets stored here, too. This will most likely be rare as | |
107 | * the cipso direct mapping in used internally. | |
108 | */ | |
109 | struct smack_known { | |
7198e2ee | 110 | struct list_head list; |
e114e473 CS |
111 | char smk_known[SMK_LABELLEN]; |
112 | u32 smk_secid; | |
113 | struct smack_cipso *smk_cipso; | |
114 | spinlock_t smk_cipsolock; /* for changing cipso map */ | |
115 | }; | |
116 | ||
117 | /* | |
118 | * Mount options | |
119 | */ | |
120 | #define SMK_FSDEFAULT "smackfsdef=" | |
121 | #define SMK_FSFLOOR "smackfsfloor=" | |
122 | #define SMK_FSHAT "smackfshat=" | |
123 | #define SMK_FSROOT "smackfsroot=" | |
124 | ||
125 | /* | |
126 | * xattr names | |
127 | */ | |
128 | #define XATTR_SMACK_SUFFIX "SMACK64" | |
129 | #define XATTR_SMACK_IPIN "SMACK64IPIN" | |
130 | #define XATTR_SMACK_IPOUT "SMACK64IPOUT" | |
131 | #define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX | |
132 | #define XATTR_NAME_SMACKIPIN XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN | |
133 | #define XATTR_NAME_SMACKIPOUT XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT | |
134 | ||
4303154e EB |
135 | #define SMACK_CIPSO_OPTION "-CIPSO" |
136 | ||
e114e473 | 137 | /* |
6d3dc07c CS |
138 | * How communications on this socket are treated. |
139 | * Usually it's determined by the underlying netlabel code | |
140 | * but there are certain cases, including single label hosts | |
141 | * and potentially single label interfaces for which the | |
142 | * treatment can not be known in advance. | |
143 | * | |
144 | * The possibility of additional labeling schemes being | |
145 | * introduced in the future exists as well. | |
146 | */ | |
147 | #define SMACK_UNLABELED_SOCKET 0 | |
148 | #define SMACK_CIPSO_SOCKET 1 | |
149 | ||
150 | /* | |
151 | * smackfs magic number | |
e114e473 CS |
152 | * smackfs macic number |
153 | */ | |
154 | #define SMACK_MAGIC 0x43415d53 /* "SMAC" */ | |
155 | ||
156 | /* | |
157 | * A limit on the number of entries in the lists | |
158 | * makes some of the list administration easier. | |
159 | */ | |
160 | #define SMACK_LIST_MAX 10000 | |
161 | ||
162 | /* | |
163 | * CIPSO defaults. | |
164 | */ | |
165 | #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */ | |
6d3dc07c | 166 | #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */ |
e114e473 CS |
167 | #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */ |
168 | #define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */ | |
169 | #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */ | |
170 | #define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */ | |
171 | ||
172 | /* | |
173 | * Just to make the common cases easier to deal with | |
174 | */ | |
175 | #define MAY_ANY (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC) | |
176 | #define MAY_ANYREAD (MAY_READ | MAY_EXEC) | |
177 | #define MAY_ANYWRITE (MAY_WRITE | MAY_APPEND) | |
178 | #define MAY_READWRITE (MAY_READ | MAY_WRITE) | |
179 | #define MAY_NOT 0 | |
180 | ||
181 | /* | |
182 | * These functions are in smack_lsm.c | |
183 | */ | |
184 | struct inode_smack *new_inode_smack(char *); | |
185 | ||
186 | /* | |
187 | * These functions are in smack_access.c | |
188 | */ | |
189 | int smk_access(char *, char *, int); | |
190 | int smk_curacc(char *, u32); | |
191 | int smack_to_cipso(const char *, struct smack_cipso *); | |
192 | void smack_from_cipso(u32, char *, char *); | |
193 | char *smack_from_secid(const u32); | |
194 | char *smk_import(const char *, int); | |
195 | struct smack_known *smk_import_entry(const char *, int); | |
196 | u32 smack_to_secid(const char *); | |
197 | ||
198 | /* | |
199 | * Shared data. | |
200 | */ | |
201 | extern int smack_cipso_direct; | |
e114e473 | 202 | extern char *smack_net_ambient; |
15446235 | 203 | extern char *smack_onlycap; |
4303154e | 204 | extern const char *smack_cipso_option; |
e114e473 | 205 | |
e114e473 CS |
206 | extern struct smack_known smack_known_floor; |
207 | extern struct smack_known smack_known_hat; | |
208 | extern struct smack_known smack_known_huh; | |
209 | extern struct smack_known smack_known_invalid; | |
210 | extern struct smack_known smack_known_star; | |
6d3dc07c | 211 | extern struct smack_known smack_known_web; |
e114e473 | 212 | |
7198e2ee EB |
213 | extern struct list_head smack_known_list; |
214 | extern struct list_head smack_rule_list; | |
215 | extern struct list_head smk_netlbladdr_list; | |
216 | ||
076c54c5 | 217 | extern struct security_operations smack_ops; |
e114e473 CS |
218 | |
219 | /* | |
220 | * Stricly for CIPSO level manipulation. | |
221 | * Set the category bit number in a smack label sized buffer. | |
222 | */ | |
223 | static inline void smack_catset_bit(int cat, char *catsetp) | |
224 | { | |
225 | if (cat > SMK_LABELLEN * 8) | |
226 | return; | |
227 | ||
228 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); | |
229 | } | |
230 | ||
231 | /* | |
232 | * Present a pointer to the smack label in an inode blob. | |
233 | */ | |
234 | static inline char *smk_of_inode(const struct inode *isp) | |
235 | { | |
236 | struct inode_smack *sip = isp->i_security; | |
237 | return sip->smk_inode; | |
238 | } | |
239 | ||
240 | #endif /* _SECURITY_SMACK_H */ |