1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * NetLabel NETLINK Interface
4  *
5  * This file defines the NETLINK interface for the NetLabel system.  The
6  * NetLabel system manages static and dynamic label mappings for network
7  * protocols such as CIPSO and RIPSO.
8  *
9  * Author: Paul Moore <paul@paul-moore.com>
10  */
11 
12 /*
13  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
14  */
15 
16 #include <linux/init.h>
17 #include <linux/types.h>
18 #include <linux/list.h>
19 #include <linux/socket.h>
20 #include <linux/audit.h>
21 #include <linux/tty.h>
22 #include <linux/security.h>
23 #include <linux/gfp.h>
24 #include <net/sock.h>
25 #include <net/netlink.h>
26 #include <net/genetlink.h>
27 #include <net/netlabel.h>
28 #include <asm/bug.h>
29 
30 #include "netlabel_mgmt.h"
31 #include "netlabel_unlabeled.h"
32 #include "netlabel_cipso_v4.h"
33 #include "netlabel_calipso.h"
34 #include "netlabel_user.h"
35 
36 /*
37  * NetLabel NETLINK Setup Functions
38  */
39 
40 /**
41  * netlbl_netlink_init - Initialize the NETLINK communication channel
42  *
43  * Description:
44  * Call out to the NetLabel components so they can register their families and
45  * commands with the Generic NETLINK mechanism.  Returns zero on success and
46  * non-zero on failure.
47  *
48  */
netlbl_netlink_init(void)49 int __init netlbl_netlink_init(void)
50 {
51 	int ret_val;
52 
53 	ret_val = netlbl_mgmt_genl_init();
54 	if (ret_val != 0)
55 		return ret_val;
56 
57 	ret_val = netlbl_cipsov4_genl_init();
58 	if (ret_val != 0)
59 		return ret_val;
60 
61 	ret_val = netlbl_calipso_genl_init();
62 	if (ret_val != 0)
63 		return ret_val;
64 
65 	return netlbl_unlabel_genl_init();
66 }
67 
68 /*
69  * NetLabel Audit Functions
70  */
71 
72 /**
73  * netlbl_audit_start_common - Start an audit message
74  * @type: audit message type
75  * @audit_info: NetLabel audit information
76  *
77  * Description:
78  * Start an audit message using the type specified in @type and fill the audit
79  * message with some fields common to all NetLabel audit messages.  Returns
80  * a pointer to the audit buffer on success, NULL on failure.
81  *
82  */
netlbl_audit_start_common(int type,struct netlbl_audit * audit_info)83 struct audit_buffer *netlbl_audit_start_common(int type,
84 					       struct netlbl_audit *audit_info)
85 {
86 	struct audit_buffer *audit_buf;
87 	char *secctx;
88 	u32 secctx_len;
89 
90 	if (audit_enabled == AUDIT_OFF)
91 		return NULL;
92 
93 	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, type);
94 	if (audit_buf == NULL)
95 		return NULL;
96 
97 	audit_log_format(audit_buf, "netlabel: auid=%u ses=%u",
98 			 from_kuid(&init_user_ns, audit_info->loginuid),
99 			 audit_info->sessionid);
100 
101 	if (audit_info->secid != 0 &&
102 	    security_secid_to_secctx(audit_info->secid,
103 				     &secctx,
104 				     &secctx_len) == 0) {
105 		audit_log_format(audit_buf, " subj=%s", secctx);
106 		security_release_secctx(secctx, secctx_len);
107 	}
108 
109 	return audit_buf;
110 }
111