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/skbuff.h>
15#include <linux/netlink.h>
16#include <linux/rtnetlink.h>
17#include <linux/if.h>
18#include <linux/netfilter_ipv4/ip_queue.h>
19#include <linux/inet_diag.h>
20#include <linux/xfrm.h>
21#include <linux/audit.h>
22
23#include "flask.h"
24#include "av_permissions.h"
25
26struct nlmsg_perm
27{
28	u16	nlmsg_type;
29	u32	perm;
30};
31
32static struct nlmsg_perm nlmsg_route_perms[] =
33{
34	{ RTM_NEWLINK,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
35	{ RTM_DELLINK,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
36	{ RTM_GETLINK,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
37	{ RTM_SETLINK,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
38	{ RTM_NEWADDR,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
39	{ RTM_DELADDR,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
40	{ RTM_GETADDR,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
41	{ RTM_NEWROUTE,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
42	{ RTM_DELROUTE,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
43	{ RTM_GETROUTE,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
44	{ RTM_NEWNEIGH,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
45	{ RTM_DELNEIGH,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
46	{ RTM_GETNEIGH,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
47	{ RTM_NEWRULE,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
48	{ RTM_DELRULE,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
49	{ RTM_GETRULE,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
50	{ RTM_NEWQDISC,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
51	{ RTM_DELQDISC,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
52	{ RTM_GETQDISC,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
53	{ RTM_NEWTCLASS,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
54	{ RTM_DELTCLASS,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
55	{ RTM_GETTCLASS,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
56	{ RTM_NEWTFILTER,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
57	{ RTM_DELTFILTER,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
58	{ RTM_GETTFILTER,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
59	{ RTM_NEWACTION,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
60	{ RTM_DELACTION,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
61	{ RTM_GETACTION,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
62	{ RTM_NEWPREFIX,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
63	{ RTM_GETMULTICAST,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
64	{ RTM_GETANYCAST,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
65	{ RTM_GETNEIGHTBL,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
66	{ RTM_SETNEIGHTBL,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
67};
68
69static struct nlmsg_perm nlmsg_firewall_perms[] =
70{
71	{ IPQM_MODE,		NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
72	{ IPQM_VERDICT,		NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
73};
74
75static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
76{
77	{ TCPDIAG_GETSOCK,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
78	{ DCCPDIAG_GETSOCK,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
79};
80
81static struct nlmsg_perm nlmsg_xfrm_perms[] =
82{
83	{ XFRM_MSG_NEWSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
84	{ XFRM_MSG_DELSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
85	{ XFRM_MSG_GETSA,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
86	{ XFRM_MSG_NEWPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
87	{ XFRM_MSG_DELPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
88	{ XFRM_MSG_GETPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
89	{ XFRM_MSG_ALLOCSPI,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
90	{ XFRM_MSG_ACQUIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
91	{ XFRM_MSG_EXPIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
92	{ XFRM_MSG_UPDPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
93	{ XFRM_MSG_UPDSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
94	{ XFRM_MSG_POLEXPIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
95	{ XFRM_MSG_FLUSHSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
96	{ XFRM_MSG_FLUSHPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
97	{ XFRM_MSG_NEWAE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
98	{ XFRM_MSG_GETAE,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
99};
100
101static struct nlmsg_perm nlmsg_audit_perms[] =
102{
103	{ AUDIT_GET,		NETLINK_AUDIT_SOCKET__NLMSG_READ     },
104	{ AUDIT_SET,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
105	{ AUDIT_LIST,		NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
106	{ AUDIT_ADD,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
107	{ AUDIT_DEL,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
108	{ AUDIT_LIST_RULES,	NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
109	{ AUDIT_ADD_RULE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
110	{ AUDIT_DEL_RULE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
111	{ AUDIT_USER,		NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
112	{ AUDIT_SIGNAL_INFO,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
113};
114
115
116static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize)
117{
118	int i, err = -EINVAL;
119
120	for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
121		if (nlmsg_type == tab[i].nlmsg_type) {
122			*perm = tab[i].perm;
123			err = 0;
124			break;
125		}
126
127	return err;
128}
129
130int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
131{
132	int err = 0;
133
134	switch (sclass) {
135	case SECCLASS_NETLINK_ROUTE_SOCKET:
136		err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
137				 sizeof(nlmsg_route_perms));
138		break;
139
140	case SECCLASS_NETLINK_FIREWALL_SOCKET:
141	case SECCLASS_NETLINK_IP6FW_SOCKET:
142		err = nlmsg_perm(nlmsg_type, perm, nlmsg_firewall_perms,
143				 sizeof(nlmsg_firewall_perms));
144		break;
145
146	case SECCLASS_NETLINK_TCPDIAG_SOCKET:
147		err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
148				 sizeof(nlmsg_tcpdiag_perms));
149		break;
150
151	case SECCLASS_NETLINK_XFRM_SOCKET:
152		err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
153				 sizeof(nlmsg_xfrm_perms));
154		break;
155
156	case SECCLASS_NETLINK_AUDIT_SOCKET:
157		if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
158		     nlmsg_type <= AUDIT_LAST_USER_MSG) ||
159		    (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
160                     nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
161			*perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
162		} else {
163			err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
164					 sizeof(nlmsg_audit_perms));
165		}
166		break;
167
168	/* No messaging from userspace, or class unknown/unhandled */
169	default:
170		err = -ENOENT;
171		break;
172	}
173
174	return err;
175}
176