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