nlmsgtab.c revision b207a290ea7dc83dba02e40b81cc8a29415a9c60 
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/tcp_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_GETPREFIX,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
64	{ RTM_GETMULTICAST,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
65	{ RTM_GETANYCAST,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
66};
67
68static struct nlmsg_perm nlmsg_firewall_perms[] =
69{
70	{ IPQM_MODE,		NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
71	{ IPQM_VERDICT,		NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
72};
73
74static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
75{
76	{ TCPDIAG_GETSOCK,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
77};
78
79static struct nlmsg_perm nlmsg_xfrm_perms[] =
80{
81	{ XFRM_MSG_NEWSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
82	{ XFRM_MSG_DELSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
83	{ XFRM_MSG_GETSA,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
84	{ XFRM_MSG_NEWPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
85	{ XFRM_MSG_DELPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
86	{ XFRM_MSG_GETPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
87	{ XFRM_MSG_ALLOCSPI,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
88	{ XFRM_MSG_UPDPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
89	{ XFRM_MSG_UPDSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
90};
91
92static struct nlmsg_perm nlmsg_audit_perms[] =
93{
94	{ AUDIT_GET,		NETLINK_AUDIT_SOCKET__NLMSG_READ     },
95	{ AUDIT_SET,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
96	{ AUDIT_LIST,		NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
97	{ AUDIT_ADD,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
98	{ AUDIT_DEL,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
99	{ AUDIT_USER,		NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
100};
101
102
103static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize)
104{
105	int i, err = -EINVAL;
106
107	for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
108		if (nlmsg_type == tab[i].nlmsg_type) {
109			*perm = tab[i].perm;
110			err = 0;
111			break;
112		}
113
114	return err;
115}
116
117int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
118{
119	int err = 0;
120
121	switch (sclass) {
122	case SECCLASS_NETLINK_ROUTE_SOCKET:
123		err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
124				 sizeof(nlmsg_route_perms));
125		break;
126
127	case SECCLASS_NETLINK_FIREWALL_SOCKET:
128	case SECCLASS_NETLINK_IP6FW_SOCKET:
129		err = nlmsg_perm(nlmsg_type, perm, nlmsg_firewall_perms,
130				 sizeof(nlmsg_firewall_perms));
131		break;
132
133	case SECCLASS_NETLINK_TCPDIAG_SOCKET:
134		err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
135				 sizeof(nlmsg_tcpdiag_perms));
136		break;
137
138	case SECCLASS_NETLINK_XFRM_SOCKET:
139		err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
140				 sizeof(nlmsg_xfrm_perms));
141		break;
142
143	case SECCLASS_NETLINK_AUDIT_SOCKET:
144		err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
145				 sizeof(nlmsg_audit_perms));
146		break;
147
148	/* No messaging from userspace, or class unknown/unhandled */
149	default:
150		err = -ENOENT;
151		break;
152	}
153
154	return err;
155}
156