blob: fd53c7ae29770c3fcab015af34d88d72f6cc61a0 [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>
Paul Moore96cb8e32006-08-03 16:48:59 -070032#include <linux/list.h>
33#include <linux/spinlock.h>
34#include <linux/socket.h>
35#include <linux/string.h>
36#include <linux/skbuff.h>
Paul Moorede646882006-11-17 17:38:55 -050037#include <linux/audit.h>
Paul Moore96cb8e32006-08-03 16:48:59 -070038#include <net/sock.h>
39#include <net/netlink.h>
40#include <net/genetlink.h>
41
42#include <net/netlabel.h>
43#include <asm/bug.h>
44
45#include "netlabel_user.h"
46#include "netlabel_domainhash.h"
47#include "netlabel_unlabeled.h"
48
49/* Accept unlabeled packets flag */
Paul Moorecd287862006-11-17 17:38:44 -050050static u8 netlabel_unlabel_acceptflg = 0;
Paul Moore96cb8e32006-08-03 16:48:59 -070051
52/* NetLabel Generic NETLINK CIPSOv4 family */
53static struct genl_family netlbl_unlabel_gnl_family = {
54 .id = GENL_ID_GENERATE,
55 .hdrsize = 0,
56 .name = NETLBL_NLTYPE_UNLABELED_NAME,
57 .version = NETLBL_PROTO_VERSION,
Paul Moorefd385852006-09-25 15:56:37 -070058 .maxattr = NLBL_UNLABEL_A_MAX,
Paul Moore96cb8e32006-08-03 16:48:59 -070059};
60
Paul Moorefd385852006-09-25 15:56:37 -070061/* NetLabel Netlink attribute policy */
Patrick McHardyef7c79e2007-06-05 12:38:30 -070062static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
Paul Moorefd385852006-09-25 15:56:37 -070063 [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
64};
Paul Moore96cb8e32006-08-03 16:48:59 -070065
66/*
Paul Moore32f50cd2006-09-28 14:51:47 -070067 * Helper Functions
68 */
69
70/**
71 * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
72 * @value: desired value
Paul Moore95d4e6b2006-09-29 17:05:05 -070073 * @audit_info: NetLabel audit information
Paul Moore32f50cd2006-09-28 14:51:47 -070074 *
75 * Description:
76 * Set the value of the unlabeled accept flag to @value.
77 *
78 */
Paul Moore95d4e6b2006-09-29 17:05:05 -070079static void netlbl_unlabel_acceptflg_set(u8 value,
80 struct netlbl_audit *audit_info)
Paul Moore32f50cd2006-09-28 14:51:47 -070081{
Paul Moore95d4e6b2006-09-29 17:05:05 -070082 struct audit_buffer *audit_buf;
83 u8 old_val;
84
Paul Moore4be27002007-10-26 04:29:08 -070085 old_val = netlabel_unlabel_acceptflg;
Paul Moorecd287862006-11-17 17:38:44 -050086 netlabel_unlabel_acceptflg = value;
Paul Moore95d4e6b2006-09-29 17:05:05 -070087 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
88 audit_info);
Paul Moorede646882006-11-17 17:38:55 -050089 if (audit_buf != NULL) {
90 audit_log_format(audit_buf,
91 " unlbl_accept=%u old=%u", value, old_val);
92 audit_log_end(audit_buf);
93 }
Paul Moore32f50cd2006-09-28 14:51:47 -070094}
95
96/*
Paul Moore96cb8e32006-08-03 16:48:59 -070097 * NetLabel Command Handlers
98 */
99
100/**
101 * netlbl_unlabel_accept - Handle an ACCEPT message
102 * @skb: the NETLINK buffer
103 * @info: the Generic NETLINK info block
104 *
105 * Description:
106 * Process a user generated ACCEPT message and set the accept flag accordingly.
107 * Returns zero on success, negative values on failure.
108 *
109 */
110static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
111{
Paul Moorefd385852006-09-25 15:56:37 -0700112 u8 value;
Paul Moore95d4e6b2006-09-29 17:05:05 -0700113 struct netlbl_audit audit_info;
Paul Moore96cb8e32006-08-03 16:48:59 -0700114
Paul Moorefd385852006-09-25 15:56:37 -0700115 if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
116 value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
Paul Moore96cb8e32006-08-03 16:48:59 -0700117 if (value == 1 || value == 0) {
Paul Moore95d4e6b2006-09-29 17:05:05 -0700118 netlbl_netlink_auditinfo(skb, &audit_info);
119 netlbl_unlabel_acceptflg_set(value, &audit_info);
Paul Moore32f50cd2006-09-28 14:51:47 -0700120 return 0;
Paul Moore96cb8e32006-08-03 16:48:59 -0700121 }
122 }
123
Paul Moore32f50cd2006-09-28 14:51:47 -0700124 return -EINVAL;
Paul Moore96cb8e32006-08-03 16:48:59 -0700125}
126
127/**
128 * netlbl_unlabel_list - Handle a LIST message
129 * @skb: the NETLINK buffer
130 * @info: the Generic NETLINK info block
131 *
132 * Description:
133 * Process a user generated LIST message and respond with the current status.
134 * Returns zero on success, negative values on failure.
135 *
136 */
137static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
138{
Paul Moorefd385852006-09-25 15:56:37 -0700139 int ret_val = -EINVAL;
Paul Moore96cb8e32006-08-03 16:48:59 -0700140 struct sk_buff *ans_skb;
Paul Moorefd385852006-09-25 15:56:37 -0700141 void *data;
Paul Moore96cb8e32006-08-03 16:48:59 -0700142
Thomas Graf339bf982006-11-10 14:10:15 -0800143 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
Paul Moore96cb8e32006-08-03 16:48:59 -0700144 if (ans_skb == NULL)
145 goto list_failure;
Thomas Graf17c157c2006-11-14 19:46:02 -0800146 data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family,
147 0, NLBL_UNLABEL_C_LIST);
Paul Moorefd385852006-09-25 15:56:37 -0700148 if (data == NULL) {
149 ret_val = -ENOMEM;
Paul Moore96cb8e32006-08-03 16:48:59 -0700150 goto list_failure;
Paul Moorefd385852006-09-25 15:56:37 -0700151 }
Paul Moore96cb8e32006-08-03 16:48:59 -0700152
Paul Moorefd385852006-09-25 15:56:37 -0700153 ret_val = nla_put_u8(ans_skb,
154 NLBL_UNLABEL_A_ACPTFLG,
Paul Moorecd287862006-11-17 17:38:44 -0500155 netlabel_unlabel_acceptflg);
Paul Moore96cb8e32006-08-03 16:48:59 -0700156 if (ret_val != 0)
157 goto list_failure;
158
Paul Moorefd385852006-09-25 15:56:37 -0700159 genlmsg_end(ans_skb, data);
160
Thomas Graf81878d22006-11-14 19:45:27 -0800161 ret_val = genlmsg_reply(ans_skb, info);
Paul Moore96cb8e32006-08-03 16:48:59 -0700162 if (ret_val != 0)
163 goto list_failure;
Paul Moore96cb8e32006-08-03 16:48:59 -0700164 return 0;
165
166list_failure:
Patrick McHardyb08d5842007-02-27 09:57:37 -0800167 kfree_skb(ans_skb);
Paul Moore96cb8e32006-08-03 16:48:59 -0700168 return ret_val;
169}
170
171
172/*
173 * NetLabel Generic NETLINK Command Definitions
174 */
175
176static struct genl_ops netlbl_unlabel_genl_c_accept = {
177 .cmd = NLBL_UNLABEL_C_ACCEPT,
Paul Moorefd385852006-09-25 15:56:37 -0700178 .flags = GENL_ADMIN_PERM,
179 .policy = netlbl_unlabel_genl_policy,
Paul Moore96cb8e32006-08-03 16:48:59 -0700180 .doit = netlbl_unlabel_accept,
181 .dumpit = NULL,
182};
183
184static struct genl_ops netlbl_unlabel_genl_c_list = {
185 .cmd = NLBL_UNLABEL_C_LIST,
186 .flags = 0,
Paul Moorefd385852006-09-25 15:56:37 -0700187 .policy = netlbl_unlabel_genl_policy,
Paul Moore96cb8e32006-08-03 16:48:59 -0700188 .doit = netlbl_unlabel_list,
189 .dumpit = NULL,
190};
191
192
193/*
194 * NetLabel Generic NETLINK Protocol Functions
195 */
196
197/**
198 * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
199 *
200 * Description:
201 * Register the unlabeled packet NetLabel component with the Generic NETLINK
202 * mechanism. Returns zero on success, negative values on failure.
203 *
204 */
205int netlbl_unlabel_genl_init(void)
206{
207 int ret_val;
208
209 ret_val = genl_register_family(&netlbl_unlabel_gnl_family);
210 if (ret_val != 0)
211 return ret_val;
212
213 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
214 &netlbl_unlabel_genl_c_accept);
215 if (ret_val != 0)
216 return ret_val;
217
218 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
219 &netlbl_unlabel_genl_c_list);
220 if (ret_val != 0)
221 return ret_val;
222
223 return 0;
224}
225
226/*
227 * NetLabel KAPI Hooks
228 */
229
230/**
231 * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
232 * @secattr: the security attributes
233 *
234 * Description:
235 * Determine the security attributes, if any, for an unlabled packet and return
236 * them in @secattr. Returns zero on success and negative values on failure.
237 *
238 */
239int netlbl_unlabel_getattr(struct netlbl_lsm_secattr *secattr)
240{
Paul Moorec783f1c2008-01-29 08:37:52 -0500241 if (netlabel_unlabel_acceptflg == 0)
242 return -ENOMSG;
243 netlbl_secattr_init(secattr);
244 return 0;
Paul Moore96cb8e32006-08-03 16:48:59 -0700245}
246
247/**
248 * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
249 *
250 * Description:
251 * Set the default NetLabel configuration to allow incoming unlabeled packets
252 * and to send unlabeled network traffic by default.
253 *
254 */
255int netlbl_unlabel_defconf(void)
256{
257 int ret_val;
258 struct netlbl_dom_map *entry;
Paul Moore95d4e6b2006-09-29 17:05:05 -0700259 struct netlbl_audit audit_info;
Paul Moore32f50cd2006-09-28 14:51:47 -0700260
Paul Moore95d4e6b2006-09-29 17:05:05 -0700261 /* Only the kernel is allowed to call this function and the only time
262 * it is called is at bootup before the audit subsystem is reporting
263 * messages so don't worry to much about these values. */
264 security_task_getsecid(current, &audit_info.secid);
265 audit_info.loginuid = 0;
Paul Moore96cb8e32006-08-03 16:48:59 -0700266
267 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
268 if (entry == NULL)
269 return -ENOMEM;
270 entry->type = NETLBL_NLTYPE_UNLABELED;
Paul Moore95d4e6b2006-09-29 17:05:05 -0700271 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
Paul Moore96cb8e32006-08-03 16:48:59 -0700272 if (ret_val != 0)
273 return ret_val;
274
Paul Moore95d4e6b2006-09-29 17:05:05 -0700275 netlbl_unlabel_acceptflg_set(1, &audit_info);
Paul Moore96cb8e32006-08-03 16:48:59 -0700276
277 return 0;
278}