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  • only in /asuswrt-rt-n18u-9.0.0.4.380.2695/release/src-rt-6.x.4708/linux/linux-2.6/security/selinux/
1/*
2 * Netlink message type permission tables, for user generated messages.
3 *
4 * Author: James Morris <jmorris@redhat.com>
5 *
6 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2,
10 * as published by the Free Software Foundation.
11 */
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/netlink.h>
15#include <linux/rtnetlink.h>
16#include <linux/if.h>
17#include <linux/netfilter_ipv4/ip_queue.h>
18#include <linux/inet_diag.h>
19#include <linux/xfrm.h>
20#include <linux/audit.h>
21
22#include "flask.h"
23#include "av_permissions.h"
24
25struct nlmsg_perm {
26	u16	nlmsg_type;
27	u32	perm;
28};
29
30static struct nlmsg_perm nlmsg_route_perms[] =
31{
32	{ RTM_NEWLINK,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
33	{ RTM_DELLINK,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
34	{ RTM_GETLINK,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
35	{ RTM_SETLINK,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
36	{ RTM_NEWADDR,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
37	{ RTM_DELADDR,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
38	{ RTM_GETADDR,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
39	{ RTM_NEWROUTE,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
40	{ RTM_DELROUTE,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
41	{ RTM_GETROUTE,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
42	{ RTM_NEWNEIGH,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
43	{ RTM_DELNEIGH,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
44	{ RTM_GETNEIGH,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
45	{ RTM_NEWRULE,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
46	{ RTM_DELRULE,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
47	{ RTM_GETRULE,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
48	{ RTM_NEWQDISC,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
49	{ RTM_DELQDISC,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
50	{ RTM_GETQDISC,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
51	{ RTM_NEWTCLASS,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
52	{ RTM_DELTCLASS,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
53	{ RTM_GETTCLASS,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
54	{ RTM_NEWTFILTER,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
55	{ RTM_DELTFILTER,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
56	{ RTM_GETTFILTER,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
57	{ RTM_NEWACTION,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
58	{ RTM_DELACTION,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
59	{ RTM_GETACTION,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
60	{ RTM_NEWPREFIX,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
61	{ RTM_GETMULTICAST,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
62	{ RTM_GETANYCAST,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
63	{ RTM_GETNEIGHTBL,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
64	{ RTM_SETNEIGHTBL,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
65	{ RTM_NEWADDRLABEL,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
66	{ RTM_DELADDRLABEL,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
67	{ RTM_GETADDRLABEL,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
68	{ RTM_GETDCB,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
69	{ RTM_SETDCB,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
70};
71
72static struct nlmsg_perm nlmsg_firewall_perms[] =
73{
74	{ IPQM_MODE,		NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
75	{ IPQM_VERDICT,		NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
76};
77
78static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
79{
80	{ TCPDIAG_GETSOCK,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
81	{ DCCPDIAG_GETSOCK,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
82};
83
84static struct nlmsg_perm nlmsg_xfrm_perms[] =
85{
86	{ XFRM_MSG_NEWSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
87	{ XFRM_MSG_DELSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
88	{ XFRM_MSG_GETSA,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
89	{ XFRM_MSG_NEWPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
90	{ XFRM_MSG_DELPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
91	{ XFRM_MSG_GETPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
92	{ XFRM_MSG_ALLOCSPI,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
93	{ XFRM_MSG_ACQUIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
94	{ XFRM_MSG_EXPIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
95	{ XFRM_MSG_UPDPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
96	{ XFRM_MSG_UPDSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
97	{ XFRM_MSG_POLEXPIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
98	{ XFRM_MSG_FLUSHSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
99	{ XFRM_MSG_FLUSHPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
100	{ XFRM_MSG_NEWAE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
101	{ XFRM_MSG_GETAE,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
102};
103
104static struct nlmsg_perm nlmsg_audit_perms[] =
105{
106	{ AUDIT_GET,		NETLINK_AUDIT_SOCKET__NLMSG_READ     },
107	{ AUDIT_SET,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
108	{ AUDIT_LIST,		NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
109	{ AUDIT_ADD,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
110	{ AUDIT_DEL,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
111	{ AUDIT_LIST_RULES,	NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
112	{ AUDIT_ADD_RULE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
113	{ AUDIT_DEL_RULE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
114	{ AUDIT_USER,		NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
115	{ AUDIT_SIGNAL_INFO,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
116	{ AUDIT_TRIM,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
117	{ AUDIT_MAKE_EQUIV,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
118	{ AUDIT_TTY_GET,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
119	{ AUDIT_TTY_SET,	NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT	},
120};
121
122
123static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize)
124{
125	int i, err = -EINVAL;
126
127	for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
128		if (nlmsg_type == tab[i].nlmsg_type) {
129			*perm = tab[i].perm;
130			err = 0;
131			break;
132		}
133
134	return err;
135}
136
137int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
138{
139	int err = 0;
140
141	switch (sclass) {
142	case SECCLASS_NETLINK_ROUTE_SOCKET:
143		err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
144				 sizeof(nlmsg_route_perms));
145		break;
146
147	case SECCLASS_NETLINK_FIREWALL_SOCKET:
148	case SECCLASS_NETLINK_IP6FW_SOCKET:
149		err = nlmsg_perm(nlmsg_type, perm, nlmsg_firewall_perms,
150				 sizeof(nlmsg_firewall_perms));
151		break;
152
153	case SECCLASS_NETLINK_TCPDIAG_SOCKET:
154		err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
155				 sizeof(nlmsg_tcpdiag_perms));
156		break;
157
158	case SECCLASS_NETLINK_XFRM_SOCKET:
159		err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
160				 sizeof(nlmsg_xfrm_perms));
161		break;
162
163	case SECCLASS_NETLINK_AUDIT_SOCKET:
164		if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
165		     nlmsg_type <= AUDIT_LAST_USER_MSG) ||
166		    (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
167		     nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
168			*perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
169		} else {
170			err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
171					 sizeof(nlmsg_audit_perms));
172		}
173		break;
174
175	/* No messaging from userspace, or class unknown/unhandled */
176	default:
177		err = -ENOENT;
178		break;
179	}
180
181	return err;
182}
183