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1 /*
2 * CIPSO - Commercial IP Security Option
3 *
4 * This is an implementation of the CIPSO 2.2 protocol as specified in
5 * draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in
6 * FIPS-188, copies of both documents can be found in the Documentation
7 * directory. While CIPSO never became a full IETF RFC standard many vendors
8 * have chosen to adopt the protocol and over the years it has become a
9 * de-facto standard for labeled networking.
10 *
11 * Author: Paul Moore <paul@paul-moore.com>
12 *
13 */
14
15 /*
16 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
17 *
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2 of the License, or
21 * (at your option) any later version.
22 *
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
26 * the GNU General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, see <http://www.gnu.org/licenses/>.
30 *
31 */
32
33 #ifndef _CIPSO_IPV4_H
34 #define _CIPSO_IPV4_H
35
36 #include <linux/types.h>
37 #include <linux/rcupdate.h>
38 #include <linux/list.h>
39 #include <linux/net.h>
40 #include <linux/skbuff.h>
41 #include <net/netlabel.h>
42 #include <net/request_sock.h>
43 #include <linux/atomic.h>
44 #include <asm/unaligned.h>
45
46 /* known doi values */
47 #define CIPSO_V4_DOI_UNKNOWN 0x00000000
48
49 /* standard tag types */
50 #define CIPSO_V4_TAG_INVALID 0
51 #define CIPSO_V4_TAG_RBITMAP 1
52 #define CIPSO_V4_TAG_ENUM 2
53 #define CIPSO_V4_TAG_RANGE 5
54 #define CIPSO_V4_TAG_PBITMAP 6
55 #define CIPSO_V4_TAG_FREEFORM 7
56
57 /* non-standard tag types (tags > 127) */
58 #define CIPSO_V4_TAG_LOCAL 128
59
60 /* doi mapping types */
61 #define CIPSO_V4_MAP_UNKNOWN 0
62 #define CIPSO_V4_MAP_TRANS 1
63 #define CIPSO_V4_MAP_PASS 2
64 #define CIPSO_V4_MAP_LOCAL 3
65
66 /* limits */
67 #define CIPSO_V4_MAX_REM_LVLS 255
68 #define CIPSO_V4_INV_LVL 0x80000000
69 #define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1)
70 #define CIPSO_V4_MAX_REM_CATS 65534
71 #define CIPSO_V4_INV_CAT 0x80000000
72 #define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1)
73
74 /*
75 * CIPSO DOI definitions
76 */
77
78 /* DOI definition struct */
79 #define CIPSO_V4_TAG_MAXCNT 5
80 struct cipso_v4_doi {
81 u32 doi;
82 u32 type;
83 union {
84 struct cipso_v4_std_map_tbl *std;
85 } map;
86 u8 tags[CIPSO_V4_TAG_MAXCNT];
87
88 atomic_t refcount;
89 struct list_head list;
90 struct rcu_head rcu;
91 };
92
93 /* Standard CIPSO mapping table */
94 /* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the
95 * bit is set then consider that value as unspecified, meaning the
96 * mapping for that particular level/category is invalid */
97 struct cipso_v4_std_map_tbl {
98 struct {
99 u32 *cipso;
100 u32 *local;
101 u32 cipso_size;
102 u32 local_size;
103 } lvl;
104 struct {
105 u32 *cipso;
106 u32 *local;
107 u32 cipso_size;
108 u32 local_size;
109 } cat;
110 };
111
112 /*
113 * Sysctl Variables
114 */
115
116 #ifdef CONFIG_NETLABEL
117 extern int cipso_v4_cache_enabled;
118 extern int cipso_v4_cache_bucketsize;
119 extern int cipso_v4_rbm_optfmt;
120 extern int cipso_v4_rbm_strictvalid;
121 #endif
122
123 /*
124 * DOI List Functions
125 */
126
127 #ifdef CONFIG_NETLABEL
128 int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
129 struct netlbl_audit *audit_info);
130 void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
131 int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
132 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
133 void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
134 int cipso_v4_doi_walk(u32 *skip_cnt,
135 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
136 void *cb_arg);
137 #else
138 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
139 struct netlbl_audit *audit_info)
140 {
141 return -ENOSYS;
142 }
143
144 static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
145 {
146 return;
147 }
148
149 static inline int cipso_v4_doi_remove(u32 doi,
150 struct netlbl_audit *audit_info)
151 {
152 return 0;
153 }
154
155 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
156 {
157 return NULL;
158 }
159
160 static inline int cipso_v4_doi_walk(u32 *skip_cnt,
161 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
162 void *cb_arg)
163 {
164 return 0;
165 }
166
167 static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
168 const char *domain)
169 {
170 return -ENOSYS;
171 }
172
173 static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
174 const char *domain)
175 {
176 return 0;
177 }
178 #endif /* CONFIG_NETLABEL */
179
180 /*
181 * Label Mapping Cache Functions
182 */
183
184 #ifdef CONFIG_NETLABEL
185 void cipso_v4_cache_invalidate(void);
186 int cipso_v4_cache_add(const unsigned char *cipso_ptr,
187 const struct netlbl_lsm_secattr *secattr);
188 #else
189 static inline void cipso_v4_cache_invalidate(void)
190 {
191 return;
192 }
193
194 static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr,
195 const struct netlbl_lsm_secattr *secattr)
196 {
197 return 0;
198 }
199 #endif /* CONFIG_NETLABEL */
200
201 /*
202 * Protocol Handling Functions
203 */
204
205 #ifdef CONFIG_NETLABEL
206 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
207 int cipso_v4_getattr(const unsigned char *cipso,
208 struct netlbl_lsm_secattr *secattr);
209 int cipso_v4_sock_setattr(struct sock *sk,
210 const struct cipso_v4_doi *doi_def,
211 const struct netlbl_lsm_secattr *secattr);
212 void cipso_v4_sock_delattr(struct sock *sk);
213 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
214 int cipso_v4_req_setattr(struct request_sock *req,
215 const struct cipso_v4_doi *doi_def,
216 const struct netlbl_lsm_secattr *secattr);
217 void cipso_v4_req_delattr(struct request_sock *req);
218 int cipso_v4_skbuff_setattr(struct sk_buff *skb,
219 const struct cipso_v4_doi *doi_def,
220 const struct netlbl_lsm_secattr *secattr);
221 int cipso_v4_skbuff_delattr(struct sk_buff *skb);
222 int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
223 struct netlbl_lsm_secattr *secattr);
224 unsigned char *cipso_v4_optptr(const struct sk_buff *skb);
225 int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
226 #else
227 static inline void cipso_v4_error(struct sk_buff *skb,
228 int error,
229 u32 gateway)
230 {
231 return;
232 }
233
234 static inline int cipso_v4_getattr(const unsigned char *cipso,
235 struct netlbl_lsm_secattr *secattr)
236 {
237 return -ENOSYS;
238 }
239
240 static inline int cipso_v4_sock_setattr(struct sock *sk,
241 const struct cipso_v4_doi *doi_def,
242 const struct netlbl_lsm_secattr *secattr)
243 {
244 return -ENOSYS;
245 }
246
247 static inline void cipso_v4_sock_delattr(struct sock *sk)
248 {
249 }
250
251 static inline int cipso_v4_sock_getattr(struct sock *sk,
252 struct netlbl_lsm_secattr *secattr)
253 {
254 return -ENOSYS;
255 }
256
257 static inline int cipso_v4_req_setattr(struct request_sock *req,
258 const struct cipso_v4_doi *doi_def,
259 const struct netlbl_lsm_secattr *secattr)
260 {
261 return -ENOSYS;
262 }
263
264 static inline void cipso_v4_req_delattr(struct request_sock *req)
265 {
266 return;
267 }
268
269 static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
270 const struct cipso_v4_doi *doi_def,
271 const struct netlbl_lsm_secattr *secattr)
272 {
273 return -ENOSYS;
274 }
275
276 static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
277 {
278 return -ENOSYS;
279 }
280
281 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
282 struct netlbl_lsm_secattr *secattr)
283 {
284 return -ENOSYS;
285 }
286
287 static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb)
288 {
289 return NULL;
290 }
291
292 static inline int cipso_v4_validate(const struct sk_buff *skb,
293 unsigned char **option)
294 {
295 unsigned char *opt = *option;
296 unsigned char err_offset = 0;
297 u8 opt_len = opt[1];
298 u8 opt_iter;
299 u8 tag_len;
300
301 if (opt_len < 8) {
302 err_offset = 1;
303 goto out;
304 }
305
306 if (get_unaligned_be32(&opt[2]) == 0) {
307 err_offset = 2;
308 goto out;
309 }
310
311 for (opt_iter = 6; opt_iter < opt_len;) {
312 if (opt_iter + 1 == opt_len) {
313 err_offset = opt_iter;
314 goto out;
315 }
316 tag_len = opt[opt_iter + 1];
317 if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) {
318 err_offset = opt_iter + 1;
319 goto out;
320 }
321 opt_iter += tag_len;
322 }
323
324 out:
325 *option = opt + err_offset;
326 return err_offset;
327
328 }
329 #endif /* CONFIG_NETLABEL */
330
331 #endif /* _CIPSO_IPV4_H */