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96cb8e33 PM |
1 | /* |
2 | * NetLabel Unlabeled Support | |
3 | * | |
4 | * This file defines functions for dealing with unlabeled packets for the | |
5 | * NetLabel system. The NetLabel system manages static and dynamic label | |
6 | * mappings for network protocols such as CIPSO and RIPSO. | |
7 | * | |
8 | * Author: Paul Moore <paul.moore@hp.com> | |
9 | * | |
10 | */ | |
11 | ||
12 | /* | |
13 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or | |
18 | * (at your option) any later version. | |
19 | * | |
20 | * This program is distributed in the hope that it will be useful, | |
21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
23 | * the GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
26 | * along with this program; if not, write to the Free Software | |
27 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
28 | * | |
29 | */ | |
30 | ||
31 | #include <linux/types.h> | |
32 | #include <linux/rcupdate.h> | |
33 | #include <linux/list.h> | |
34 | #include <linux/spinlock.h> | |
35 | #include <linux/socket.h> | |
36 | #include <linux/string.h> | |
37 | #include <linux/skbuff.h> | |
de64688f | 38 | #include <linux/audit.h> |
96cb8e33 PM |
39 | #include <net/sock.h> |
40 | #include <net/netlink.h> | |
41 | #include <net/genetlink.h> | |
42 | ||
43 | #include <net/netlabel.h> | |
44 | #include <asm/bug.h> | |
45 | ||
46 | #include "netlabel_user.h" | |
47 | #include "netlabel_domainhash.h" | |
48 | #include "netlabel_unlabeled.h" | |
49 | ||
50 | /* Accept unlabeled packets flag */ | |
cd28786d PM |
51 | static DEFINE_SPINLOCK(netlabel_unlabel_acceptflg_lock); |
52 | static u8 netlabel_unlabel_acceptflg = 0; | |
96cb8e33 PM |
53 | |
54 | /* NetLabel Generic NETLINK CIPSOv4 family */ | |
55 | static struct genl_family netlbl_unlabel_gnl_family = { | |
56 | .id = GENL_ID_GENERATE, | |
57 | .hdrsize = 0, | |
58 | .name = NETLBL_NLTYPE_UNLABELED_NAME, | |
59 | .version = NETLBL_PROTO_VERSION, | |
fd385855 | 60 | .maxattr = NLBL_UNLABEL_A_MAX, |
96cb8e33 PM |
61 | }; |
62 | ||
fd385855 | 63 | /* NetLabel Netlink attribute policy */ |
ef7c79ed | 64 | static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = { |
fd385855 PM |
65 | [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 }, |
66 | }; | |
96cb8e33 | 67 | |
32f50cde PM |
68 | /* |
69 | * Helper Functions | |
70 | */ | |
71 | ||
72 | /** | |
73 | * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag | |
74 | * @value: desired value | |
95d4e6be | 75 | * @audit_info: NetLabel audit information |
32f50cde PM |
76 | * |
77 | * Description: | |
78 | * Set the value of the unlabeled accept flag to @value. | |
79 | * | |
80 | */ | |
95d4e6be PM |
81 | static void netlbl_unlabel_acceptflg_set(u8 value, |
82 | struct netlbl_audit *audit_info) | |
32f50cde | 83 | { |
95d4e6be PM |
84 | struct audit_buffer *audit_buf; |
85 | u8 old_val; | |
86 | ||
cd28786d | 87 | spin_lock(&netlabel_unlabel_acceptflg_lock); |
4be2700f | 88 | old_val = netlabel_unlabel_acceptflg; |
cd28786d PM |
89 | netlabel_unlabel_acceptflg = value; |
90 | spin_unlock(&netlabel_unlabel_acceptflg_lock); | |
95d4e6be PM |
91 | |
92 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW, | |
93 | audit_info); | |
de64688f PM |
94 | if (audit_buf != NULL) { |
95 | audit_log_format(audit_buf, | |
96 | " unlbl_accept=%u old=%u", value, old_val); | |
97 | audit_log_end(audit_buf); | |
98 | } | |
32f50cde PM |
99 | } |
100 | ||
96cb8e33 PM |
101 | /* |
102 | * NetLabel Command Handlers | |
103 | */ | |
104 | ||
105 | /** | |
106 | * netlbl_unlabel_accept - Handle an ACCEPT message | |
107 | * @skb: the NETLINK buffer | |
108 | * @info: the Generic NETLINK info block | |
109 | * | |
110 | * Description: | |
111 | * Process a user generated ACCEPT message and set the accept flag accordingly. | |
112 | * Returns zero on success, negative values on failure. | |
113 | * | |
114 | */ | |
115 | static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info) | |
116 | { | |
fd385855 | 117 | u8 value; |
95d4e6be | 118 | struct netlbl_audit audit_info; |
96cb8e33 | 119 | |
fd385855 PM |
120 | if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) { |
121 | value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]); | |
96cb8e33 | 122 | if (value == 1 || value == 0) { |
95d4e6be PM |
123 | netlbl_netlink_auditinfo(skb, &audit_info); |
124 | netlbl_unlabel_acceptflg_set(value, &audit_info); | |
32f50cde | 125 | return 0; |
96cb8e33 PM |
126 | } |
127 | } | |
128 | ||
32f50cde | 129 | return -EINVAL; |
96cb8e33 PM |
130 | } |
131 | ||
132 | /** | |
133 | * netlbl_unlabel_list - Handle a LIST message | |
134 | * @skb: the NETLINK buffer | |
135 | * @info: the Generic NETLINK info block | |
136 | * | |
137 | * Description: | |
138 | * Process a user generated LIST message and respond with the current status. | |
139 | * Returns zero on success, negative values on failure. | |
140 | * | |
141 | */ | |
142 | static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info) | |
143 | { | |
fd385855 | 144 | int ret_val = -EINVAL; |
96cb8e33 | 145 | struct sk_buff *ans_skb; |
fd385855 | 146 | void *data; |
96cb8e33 | 147 | |
339bf98f | 148 | ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
96cb8e33 PM |
149 | if (ans_skb == NULL) |
150 | goto list_failure; | |
17c157c8 TG |
151 | data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family, |
152 | 0, NLBL_UNLABEL_C_LIST); | |
fd385855 PM |
153 | if (data == NULL) { |
154 | ret_val = -ENOMEM; | |
96cb8e33 | 155 | goto list_failure; |
fd385855 | 156 | } |
96cb8e33 | 157 | |
cd28786d | 158 | rcu_read_lock(); |
fd385855 PM |
159 | ret_val = nla_put_u8(ans_skb, |
160 | NLBL_UNLABEL_A_ACPTFLG, | |
cd28786d PM |
161 | netlabel_unlabel_acceptflg); |
162 | rcu_read_unlock(); | |
96cb8e33 PM |
163 | if (ret_val != 0) |
164 | goto list_failure; | |
165 | ||
fd385855 PM |
166 | genlmsg_end(ans_skb, data); |
167 | ||
81878d27 | 168 | ret_val = genlmsg_reply(ans_skb, info); |
96cb8e33 PM |
169 | if (ret_val != 0) |
170 | goto list_failure; | |
96cb8e33 PM |
171 | return 0; |
172 | ||
173 | list_failure: | |
b08d5840 | 174 | kfree_skb(ans_skb); |
96cb8e33 PM |
175 | return ret_val; |
176 | } | |
177 | ||
178 | ||
179 | /* | |
180 | * NetLabel Generic NETLINK Command Definitions | |
181 | */ | |
182 | ||
183 | static struct genl_ops netlbl_unlabel_genl_c_accept = { | |
184 | .cmd = NLBL_UNLABEL_C_ACCEPT, | |
fd385855 PM |
185 | .flags = GENL_ADMIN_PERM, |
186 | .policy = netlbl_unlabel_genl_policy, | |
96cb8e33 PM |
187 | .doit = netlbl_unlabel_accept, |
188 | .dumpit = NULL, | |
189 | }; | |
190 | ||
191 | static struct genl_ops netlbl_unlabel_genl_c_list = { | |
192 | .cmd = NLBL_UNLABEL_C_LIST, | |
193 | .flags = 0, | |
fd385855 | 194 | .policy = netlbl_unlabel_genl_policy, |
96cb8e33 PM |
195 | .doit = netlbl_unlabel_list, |
196 | .dumpit = NULL, | |
197 | }; | |
198 | ||
199 | ||
200 | /* | |
201 | * NetLabel Generic NETLINK Protocol Functions | |
202 | */ | |
203 | ||
204 | /** | |
205 | * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component | |
206 | * | |
207 | * Description: | |
208 | * Register the unlabeled packet NetLabel component with the Generic NETLINK | |
209 | * mechanism. Returns zero on success, negative values on failure. | |
210 | * | |
211 | */ | |
212 | int netlbl_unlabel_genl_init(void) | |
213 | { | |
214 | int ret_val; | |
215 | ||
216 | ret_val = genl_register_family(&netlbl_unlabel_gnl_family); | |
217 | if (ret_val != 0) | |
218 | return ret_val; | |
219 | ||
220 | ret_val = genl_register_ops(&netlbl_unlabel_gnl_family, | |
221 | &netlbl_unlabel_genl_c_accept); | |
222 | if (ret_val != 0) | |
223 | return ret_val; | |
224 | ||
225 | ret_val = genl_register_ops(&netlbl_unlabel_gnl_family, | |
226 | &netlbl_unlabel_genl_c_list); | |
227 | if (ret_val != 0) | |
228 | return ret_val; | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | /* | |
234 | * NetLabel KAPI Hooks | |
235 | */ | |
236 | ||
237 | /** | |
238 | * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet | |
239 | * @secattr: the security attributes | |
240 | * | |
241 | * Description: | |
242 | * Determine the security attributes, if any, for an unlabled packet and return | |
243 | * them in @secattr. Returns zero on success and negative values on failure. | |
244 | * | |
245 | */ | |
246 | int netlbl_unlabel_getattr(struct netlbl_lsm_secattr *secattr) | |
247 | { | |
cd28786d PM |
248 | int ret_val; |
249 | ||
250 | rcu_read_lock(); | |
251 | if (netlabel_unlabel_acceptflg == 1) { | |
252 | netlbl_secattr_init(secattr); | |
253 | ret_val = 0; | |
254 | } else | |
255 | ret_val = -ENOMSG; | |
256 | rcu_read_unlock(); | |
96cb8e33 | 257 | |
cd28786d | 258 | return ret_val; |
96cb8e33 PM |
259 | } |
260 | ||
261 | /** | |
262 | * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets | |
263 | * | |
264 | * Description: | |
265 | * Set the default NetLabel configuration to allow incoming unlabeled packets | |
266 | * and to send unlabeled network traffic by default. | |
267 | * | |
268 | */ | |
269 | int netlbl_unlabel_defconf(void) | |
270 | { | |
271 | int ret_val; | |
272 | struct netlbl_dom_map *entry; | |
95d4e6be | 273 | struct netlbl_audit audit_info; |
32f50cde | 274 | |
95d4e6be PM |
275 | /* Only the kernel is allowed to call this function and the only time |
276 | * it is called is at bootup before the audit subsystem is reporting | |
277 | * messages so don't worry to much about these values. */ | |
278 | security_task_getsecid(current, &audit_info.secid); | |
279 | audit_info.loginuid = 0; | |
96cb8e33 PM |
280 | |
281 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
282 | if (entry == NULL) | |
283 | return -ENOMEM; | |
284 | entry->type = NETLBL_NLTYPE_UNLABELED; | |
95d4e6be | 285 | ret_val = netlbl_domhsh_add_default(entry, &audit_info); |
96cb8e33 PM |
286 | if (ret_val != 0) |
287 | return ret_val; | |
288 | ||
95d4e6be | 289 | netlbl_unlabel_acceptflg_set(1, &audit_info); |
96cb8e33 PM |
290 | |
291 | return 0; | |
292 | } |