1 /*
2 * NetLabel NETLINK Interface
3 *
4 * This file defines the NETLINK interface for the NetLabel system. The
5 * NetLabel system manages static and dynamic label mappings for network
6 * protocols such as CIPSO and RIPSO.
7 *
8 * Author: Paul Moore <paul@paul-moore.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, see <http://www.gnu.org/licenses/>.
27 *
28 */
29
30 #include <linux/init.h>
31 #include <linux/types.h>
32 #include <linux/list.h>
33 #include <linux/socket.h>
34 #include <linux/audit.h>
35 #include <linux/tty.h>
36 #include <linux/security.h>
37 #include <linux/gfp.h>
38 #include <net/sock.h>
39 #include <net/netlink.h>
40 #include <net/genetlink.h>
41 #include <net/netlabel.h>
42 #include <asm/bug.h>
43
44 #include "netlabel_mgmt.h"
45 #include "netlabel_unlabeled.h"
46 #include "netlabel_cipso_v4.h"
47 #include "netlabel_calipso.h"
48 #include "netlabel_user.h"
49
50 /*
51 * NetLabel NETLINK Setup Functions
52 */
53
54 /**
55 * netlbl_netlink_init - Initialize the NETLINK communication channel
56 *
57 * Description:
58 * Call out to the NetLabel components so they can register their families and
59 * commands with the Generic NETLINK mechanism. Returns zero on success and
60 * non-zero on failure.
61 *
62 */
63 int __init netlbl_netlink_init(void)
64 {
65 int ret_val;
66
67 ret_val = netlbl_mgmt_genl_init();
68 if (ret_val != 0)
69 return ret_val;
70
71 ret_val = netlbl_cipsov4_genl_init();
72 if (ret_val != 0)
73 return ret_val;
74
75 ret_val = netlbl_calipso_genl_init();
76 if (ret_val != 0)
77 return ret_val;
78
79 return netlbl_unlabel_genl_init();
80 }
81
82 /*
83 * NetLabel Audit Functions
84 */
85
86 /**
87 * netlbl_audit_start_common - Start an audit message
88 * @type: audit message type
89 * @audit_info: NetLabel audit information
90 *
91 * Description:
92 * Start an audit message using the type specified in @type and fill the audit
93 * message with some fields common to all NetLabel audit messages. Returns
94 * a pointer to the audit buffer on success, NULL on failure.
95 *
96 */
97 struct audit_buffer *netlbl_audit_start_common(int type,
98 struct netlbl_audit *audit_info)
99 {
100 struct audit_buffer *audit_buf;
101 char *secctx;
102 u32 secctx_len;
103
104 if (audit_enabled == 0)
105 return NULL;
106
107 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type);
108 if (audit_buf == NULL)
109 return NULL;
110
111 audit_log_format(audit_buf, "netlabel: auid=%u ses=%u",
112 from_kuid(&init_user_ns, audit_info->loginuid),
113 audit_info->sessionid);
114
115 if (audit_info->secid != 0 &&
116 security_secid_to_secctx(audit_info->secid,
117 &secctx,
118 &secctx_len) == 0) {
119 audit_log_format(audit_buf, " subj=%s", secctx);
120 security_release_secctx(secctx, secctx_len);
121 }
122
123 return audit_buf;
124 }
125
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