blob: 5bc37181662e5e0a51281093c08d590c199cac2e [file] [log] [blame]
Paul Moore96cb8e32006-08-03 16:48:59 -07001/*
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>
Paul Moorede646882006-11-17 17:38:55 -050038#include <linux/audit.h>
Paul Moore96cb8e32006-08-03 16:48:59 -070039#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 */
Paul Moorecd287862006-11-17 17:38:44 -050051static DEFINE_SPINLOCK(netlabel_unlabel_acceptflg_lock);
52static u8 netlabel_unlabel_acceptflg = 0;
Paul Moore96cb8e32006-08-03 16:48:59 -070053
54/* NetLabel Generic NETLINK CIPSOv4 family */
55static 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,
Paul Moorefd385852006-09-25 15:56:37 -070060 .maxattr = NLBL_UNLABEL_A_MAX,
Paul Moore96cb8e32006-08-03 16:48:59 -070061};
62
Paul Moorefd385852006-09-25 15:56:37 -070063/* NetLabel Netlink attribute policy */
64static struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
65 [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
66};
Paul Moore96cb8e32006-08-03 16:48:59 -070067
68/*
Paul Moore32f50cd2006-09-28 14:51:47 -070069 * Helper Functions
70 */
71
72/**
73 * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
74 * @value: desired value
Paul Moore95d4e6b2006-09-29 17:05:05 -070075 * @audit_info: NetLabel audit information
Paul Moore32f50cd2006-09-28 14:51:47 -070076 *
77 * Description:
78 * Set the value of the unlabeled accept flag to @value.
79 *
80 */
Paul Moore95d4e6b2006-09-29 17:05:05 -070081static void netlbl_unlabel_acceptflg_set(u8 value,
82 struct netlbl_audit *audit_info)
Paul Moore32f50cd2006-09-28 14:51:47 -070083{
Paul Moore95d4e6b2006-09-29 17:05:05 -070084 struct audit_buffer *audit_buf;
85 u8 old_val;
86
Paul Moorecd287862006-11-17 17:38:44 -050087 rcu_read_lock();
88 old_val = netlabel_unlabel_acceptflg;
89 spin_lock(&netlabel_unlabel_acceptflg_lock);
90 netlabel_unlabel_acceptflg = value;
91 spin_unlock(&netlabel_unlabel_acceptflg_lock);
92 rcu_read_unlock();
Paul Moore95d4e6b2006-09-29 17:05:05 -070093
94 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
95 audit_info);
Paul Moorede646882006-11-17 17:38:55 -050096 if (audit_buf != NULL) {
97 audit_log_format(audit_buf,
98 " unlbl_accept=%u old=%u", value, old_val);
99 audit_log_end(audit_buf);
100 }
Paul Moore32f50cd2006-09-28 14:51:47 -0700101}
102
103/*
Paul Moore96cb8e32006-08-03 16:48:59 -0700104 * NetLabel Command Handlers
105 */
106
107/**
108 * netlbl_unlabel_accept - Handle an ACCEPT message
109 * @skb: the NETLINK buffer
110 * @info: the Generic NETLINK info block
111 *
112 * Description:
113 * Process a user generated ACCEPT message and set the accept flag accordingly.
114 * Returns zero on success, negative values on failure.
115 *
116 */
117static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
118{
Paul Moorefd385852006-09-25 15:56:37 -0700119 u8 value;
Paul Moore95d4e6b2006-09-29 17:05:05 -0700120 struct netlbl_audit audit_info;
Paul Moore96cb8e32006-08-03 16:48:59 -0700121
Paul Moorefd385852006-09-25 15:56:37 -0700122 if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
123 value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
Paul Moore96cb8e32006-08-03 16:48:59 -0700124 if (value == 1 || value == 0) {
Paul Moore95d4e6b2006-09-29 17:05:05 -0700125 netlbl_netlink_auditinfo(skb, &audit_info);
126 netlbl_unlabel_acceptflg_set(value, &audit_info);
Paul Moore32f50cd2006-09-28 14:51:47 -0700127 return 0;
Paul Moore96cb8e32006-08-03 16:48:59 -0700128 }
129 }
130
Paul Moore32f50cd2006-09-28 14:51:47 -0700131 return -EINVAL;
Paul Moore96cb8e32006-08-03 16:48:59 -0700132}
133
134/**
135 * netlbl_unlabel_list - Handle a LIST message
136 * @skb: the NETLINK buffer
137 * @info: the Generic NETLINK info block
138 *
139 * Description:
140 * Process a user generated LIST message and respond with the current status.
141 * Returns zero on success, negative values on failure.
142 *
143 */
144static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
145{
Paul Moorefd385852006-09-25 15:56:37 -0700146 int ret_val = -EINVAL;
Paul Moore96cb8e32006-08-03 16:48:59 -0700147 struct sk_buff *ans_skb;
Paul Moorefd385852006-09-25 15:56:37 -0700148 void *data;
Paul Moore96cb8e32006-08-03 16:48:59 -0700149
Thomas Graf339bf982006-11-10 14:10:15 -0800150 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
Paul Moore96cb8e32006-08-03 16:48:59 -0700151 if (ans_skb == NULL)
152 goto list_failure;
Thomas Graf17c157c2006-11-14 19:46:02 -0800153 data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family,
154 0, NLBL_UNLABEL_C_LIST);
Paul Moorefd385852006-09-25 15:56:37 -0700155 if (data == NULL) {
156 ret_val = -ENOMEM;
Paul Moore96cb8e32006-08-03 16:48:59 -0700157 goto list_failure;
Paul Moorefd385852006-09-25 15:56:37 -0700158 }
Paul Moore96cb8e32006-08-03 16:48:59 -0700159
Paul Moorecd287862006-11-17 17:38:44 -0500160 rcu_read_lock();
Paul Moorefd385852006-09-25 15:56:37 -0700161 ret_val = nla_put_u8(ans_skb,
162 NLBL_UNLABEL_A_ACPTFLG,
Paul Moorecd287862006-11-17 17:38:44 -0500163 netlabel_unlabel_acceptflg);
164 rcu_read_unlock();
Paul Moore96cb8e32006-08-03 16:48:59 -0700165 if (ret_val != 0)
166 goto list_failure;
167
Paul Moorefd385852006-09-25 15:56:37 -0700168 genlmsg_end(ans_skb, data);
169
Thomas Graf81878d22006-11-14 19:45:27 -0800170 ret_val = genlmsg_reply(ans_skb, info);
Paul Moore96cb8e32006-08-03 16:48:59 -0700171 if (ret_val != 0)
172 goto list_failure;
Paul Moore96cb8e32006-08-03 16:48:59 -0700173 return 0;
174
175list_failure:
Paul Moorefd385852006-09-25 15:56:37 -0700176 kfree(ans_skb);
Paul Moore96cb8e32006-08-03 16:48:59 -0700177 return ret_val;
178}
179
180
181/*
182 * NetLabel Generic NETLINK Command Definitions
183 */
184
185static struct genl_ops netlbl_unlabel_genl_c_accept = {
186 .cmd = NLBL_UNLABEL_C_ACCEPT,
Paul Moorefd385852006-09-25 15:56:37 -0700187 .flags = GENL_ADMIN_PERM,
188 .policy = netlbl_unlabel_genl_policy,
Paul Moore96cb8e32006-08-03 16:48:59 -0700189 .doit = netlbl_unlabel_accept,
190 .dumpit = NULL,
191};
192
193static struct genl_ops netlbl_unlabel_genl_c_list = {
194 .cmd = NLBL_UNLABEL_C_LIST,
195 .flags = 0,
Paul Moorefd385852006-09-25 15:56:37 -0700196 .policy = netlbl_unlabel_genl_policy,
Paul Moore96cb8e32006-08-03 16:48:59 -0700197 .doit = netlbl_unlabel_list,
198 .dumpit = NULL,
199};
200
201
202/*
203 * NetLabel Generic NETLINK Protocol Functions
204 */
205
206/**
207 * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
208 *
209 * Description:
210 * Register the unlabeled packet NetLabel component with the Generic NETLINK
211 * mechanism. Returns zero on success, negative values on failure.
212 *
213 */
214int netlbl_unlabel_genl_init(void)
215{
216 int ret_val;
217
218 ret_val = genl_register_family(&netlbl_unlabel_gnl_family);
219 if (ret_val != 0)
220 return ret_val;
221
222 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
223 &netlbl_unlabel_genl_c_accept);
224 if (ret_val != 0)
225 return ret_val;
226
227 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
228 &netlbl_unlabel_genl_c_list);
229 if (ret_val != 0)
230 return ret_val;
231
232 return 0;
233}
234
235/*
236 * NetLabel KAPI Hooks
237 */
238
239/**
240 * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
241 * @secattr: the security attributes
242 *
243 * Description:
244 * Determine the security attributes, if any, for an unlabled packet and return
245 * them in @secattr. Returns zero on success and negative values on failure.
246 *
247 */
248int netlbl_unlabel_getattr(struct netlbl_lsm_secattr *secattr)
249{
Paul Moorecd287862006-11-17 17:38:44 -0500250 int ret_val;
Paul Moore96cb8e32006-08-03 16:48:59 -0700251
Paul Moorecd287862006-11-17 17:38:44 -0500252 rcu_read_lock();
253 if (netlabel_unlabel_acceptflg == 1) {
254 netlbl_secattr_init(secattr);
255 ret_val = 0;
256 } else
257 ret_val = -ENOMSG;
258 rcu_read_unlock();
259
260 return ret_val;
Paul Moore96cb8e32006-08-03 16:48:59 -0700261}
262
263/**
264 * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
265 *
266 * Description:
267 * Set the default NetLabel configuration to allow incoming unlabeled packets
268 * and to send unlabeled network traffic by default.
269 *
270 */
271int netlbl_unlabel_defconf(void)
272{
273 int ret_val;
274 struct netlbl_dom_map *entry;
Paul Moore95d4e6b2006-09-29 17:05:05 -0700275 struct netlbl_audit audit_info;
Paul Moore32f50cd2006-09-28 14:51:47 -0700276
Paul Moore95d4e6b2006-09-29 17:05:05 -0700277 /* Only the kernel is allowed to call this function and the only time
278 * it is called is at bootup before the audit subsystem is reporting
279 * messages so don't worry to much about these values. */
280 security_task_getsecid(current, &audit_info.secid);
281 audit_info.loginuid = 0;
Paul Moore96cb8e32006-08-03 16:48:59 -0700282
283 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
284 if (entry == NULL)
285 return -ENOMEM;
286 entry->type = NETLBL_NLTYPE_UNLABELED;
Paul Moore95d4e6b2006-09-29 17:05:05 -0700287 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
Paul Moore96cb8e32006-08-03 16:48:59 -0700288 if (ret_val != 0)
289 return ret_val;
290
Paul Moore95d4e6b2006-09-29 17:05:05 -0700291 netlbl_unlabel_acceptflg_set(1, &audit_info);
Paul Moore96cb8e32006-08-03 16:48:59 -0700292
293 return 0;
294}