2 * NetLabel Unlabeled Support
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.
8 * Author: Paul Moore <paul.moore@hp.com>
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
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.
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.
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
31 #include <linux/types.h>
32 #include <linux/list.h>
33 #include <linux/spinlock.h>
34 #include <linux/socket.h>
35 #include <linux/string.h>
36 #include <linux/skbuff.h>
37 #include <linux/audit.h>
39 #include <net/netlink.h>
40 #include <net/genetlink.h>
42 #include <net/netlabel.h>
45 #include "netlabel_user.h"
46 #include "netlabel_domainhash.h"
47 #include "netlabel_unlabeled.h"
49 /* Accept unlabeled packets flag */
50 static u8 netlabel_unlabel_acceptflg = 0;
52 /* NetLabel Generic NETLINK CIPSOv4 family */
53 static struct genl_family netlbl_unlabel_gnl_family = {
54 .id = GENL_ID_GENERATE,
56 .name = NETLBL_NLTYPE_UNLABELED_NAME,
57 .version = NETLBL_PROTO_VERSION,
58 .maxattr = NLBL_UNLABEL_A_MAX,
61 /* NetLabel Netlink attribute policy */
62 static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
63 [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
71 * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
72 * @value: desired value
73 * @audit_info: NetLabel audit information
76 * Set the value of the unlabeled accept flag to @value.
79 static void netlbl_unlabel_acceptflg_set(u8 value,
80 struct netlbl_audit *audit_info)
82 struct audit_buffer *audit_buf;
85 old_val = netlabel_unlabel_acceptflg;
86 netlabel_unlabel_acceptflg = value;
87 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
89 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);
97 * NetLabel Command Handlers
101 * netlbl_unlabel_accept - Handle an ACCEPT message
102 * @skb: the NETLINK buffer
103 * @info: the Generic NETLINK info block
106 * Process a user generated ACCEPT message and set the accept flag accordingly.
107 * Returns zero on success, negative values on failure.
110 static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
113 struct netlbl_audit audit_info;
115 if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
116 value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
117 if (value == 1 || value == 0) {
118 netlbl_netlink_auditinfo(skb, &audit_info);
119 netlbl_unlabel_acceptflg_set(value, &audit_info);
128 * netlbl_unlabel_list - Handle a LIST message
129 * @skb: the NETLINK buffer
130 * @info: the Generic NETLINK info block
133 * Process a user generated LIST message and respond with the current status.
134 * Returns zero on success, negative values on failure.
137 static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
139 int ret_val = -EINVAL;
140 struct sk_buff *ans_skb;
143 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
146 data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family,
147 0, NLBL_UNLABEL_C_LIST);
153 ret_val = nla_put_u8(ans_skb,
154 NLBL_UNLABEL_A_ACPTFLG,
155 netlabel_unlabel_acceptflg);
159 genlmsg_end(ans_skb, data);
161 ret_val = genlmsg_reply(ans_skb, info);
173 * NetLabel Generic NETLINK Command Definitions
176 static struct genl_ops netlbl_unlabel_genl_c_accept = {
177 .cmd = NLBL_UNLABEL_C_ACCEPT,
178 .flags = GENL_ADMIN_PERM,
179 .policy = netlbl_unlabel_genl_policy,
180 .doit = netlbl_unlabel_accept,
184 static struct genl_ops netlbl_unlabel_genl_c_list = {
185 .cmd = NLBL_UNLABEL_C_LIST,
187 .policy = netlbl_unlabel_genl_policy,
188 .doit = netlbl_unlabel_list,
194 * NetLabel Generic NETLINK Protocol Functions
198 * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
201 * Register the unlabeled packet NetLabel component with the Generic NETLINK
202 * mechanism. Returns zero on success, negative values on failure.
205 int netlbl_unlabel_genl_init(void)
209 ret_val = genl_register_family(&netlbl_unlabel_gnl_family);
213 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
214 &netlbl_unlabel_genl_c_accept);
218 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
219 &netlbl_unlabel_genl_c_list);
227 * NetLabel KAPI Hooks
231 * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
232 * @secattr: the security attributes
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.
239 int netlbl_unlabel_getattr(struct netlbl_lsm_secattr *secattr)
241 if (netlabel_unlabel_acceptflg == 0)
243 netlbl_secattr_init(secattr);
248 * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
251 * Set the default NetLabel configuration to allow incoming unlabeled packets
252 * and to send unlabeled network traffic by default.
255 int netlbl_unlabel_defconf(void)
258 struct netlbl_dom_map *entry;
259 struct netlbl_audit audit_info;
261 /* 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;
267 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
270 entry->type = NETLBL_NLTYPE_UNLABELED;
271 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
275 netlbl_unlabel_acceptflg_set(1, &audit_info);