1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Netlink message type permission tables, for user generated messages.
4 *
5 * Author: James Morris <jmorris@redhat.com>
6 *
7 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
8 */
9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <linux/netlink.h>
12#include <linux/rtnetlink.h>
13#include <linux/if.h>
14#include <linux/inet_diag.h>
15#include <linux/xfrm.h>
16#include <linux/audit.h>
17#include <linux/sock_diag.h>
18
19#include "flask.h"
20#include "av_permissions.h"
21#include "security.h"
22
23struct nlmsg_perm {
24	u16	nlmsg_type;
25	u32	perm;
26};
27
28static const struct nlmsg_perm nlmsg_route_perms[] =
29{
30	{ RTM_NEWLINK,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
31	{ RTM_DELLINK,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
32	{ RTM_GETLINK,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
33	{ RTM_SETLINK,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
34	{ RTM_NEWADDR,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
35	{ RTM_DELADDR,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
36	{ RTM_GETADDR,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
37	{ RTM_NEWROUTE,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
38	{ RTM_DELROUTE,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
39	{ RTM_GETROUTE,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
40	{ RTM_NEWNEIGH,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
41	{ RTM_DELNEIGH,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
42	{ RTM_GETNEIGH,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
43	{ RTM_NEWRULE,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
44	{ RTM_DELRULE,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
45	{ RTM_GETRULE,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
46	{ RTM_NEWQDISC,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
47	{ RTM_DELQDISC,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
48	{ RTM_GETQDISC,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
49	{ RTM_NEWTCLASS,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
50	{ RTM_DELTCLASS,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
51	{ RTM_GETTCLASS,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
52	{ RTM_NEWTFILTER,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
53	{ RTM_DELTFILTER,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
54	{ RTM_GETTFILTER,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
55	{ RTM_NEWACTION,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
56	{ RTM_DELACTION,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
57	{ RTM_GETACTION,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
58	{ RTM_NEWPREFIX,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
59	{ RTM_GETMULTICAST,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
60	{ RTM_GETANYCAST,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
61	{ RTM_GETNEIGHTBL,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
62	{ RTM_SETNEIGHTBL,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
63	{ RTM_NEWADDRLABEL,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
64	{ RTM_DELADDRLABEL,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
65	{ RTM_GETADDRLABEL,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
66	{ RTM_GETDCB,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
67	{ RTM_SETDCB,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
68	{ RTM_NEWNETCONF,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
69	{ RTM_DELNETCONF,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
70	{ RTM_GETNETCONF,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
71	{ RTM_NEWMDB,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
72	{ RTM_DELMDB,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE  },
73	{ RTM_GETMDB,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
74	{ RTM_NEWNSID,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
75	{ RTM_DELNSID,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
76	{ RTM_GETNSID,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
77	{ RTM_NEWSTATS,		NETLINK_ROUTE_SOCKET__NLMSG_READ },
78	{ RTM_GETSTATS,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
79	{ RTM_NEWCACHEREPORT,	NETLINK_ROUTE_SOCKET__NLMSG_READ },
80	{ RTM_NEWCHAIN,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
81	{ RTM_DELCHAIN,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
82	{ RTM_GETCHAIN,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
83	{ RTM_NEWNEXTHOP,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
84	{ RTM_DELNEXTHOP,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
85	{ RTM_GETNEXTHOP,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
86	{ RTM_NEWLINKPROP,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
87	{ RTM_DELLINKPROP,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
88	{ RTM_NEWVLAN,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
89	{ RTM_DELVLAN,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
90	{ RTM_GETVLAN,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
91};
92
93static const struct nlmsg_perm nlmsg_tcpdiag_perms[] =
94{
95	{ TCPDIAG_GETSOCK,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
96	{ DCCPDIAG_GETSOCK,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
97	{ SOCK_DIAG_BY_FAMILY,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
98	{ SOCK_DESTROY,		NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE },
99};
100
101static const struct nlmsg_perm nlmsg_xfrm_perms[] =
102{
103	{ XFRM_MSG_NEWSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
104	{ XFRM_MSG_DELSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
105	{ XFRM_MSG_GETSA,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
106	{ XFRM_MSG_NEWPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
107	{ XFRM_MSG_DELPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
108	{ XFRM_MSG_GETPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
109	{ XFRM_MSG_ALLOCSPI,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
110	{ XFRM_MSG_ACQUIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
111	{ XFRM_MSG_EXPIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
112	{ XFRM_MSG_UPDPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
113	{ XFRM_MSG_UPDSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
114	{ XFRM_MSG_POLEXPIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
115	{ XFRM_MSG_FLUSHSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
116	{ XFRM_MSG_FLUSHPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
117	{ XFRM_MSG_NEWAE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
118	{ XFRM_MSG_GETAE,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
119	{ XFRM_MSG_REPORT,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
120	{ XFRM_MSG_MIGRATE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
121	{ XFRM_MSG_NEWSADINFO,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
122	{ XFRM_MSG_GETSADINFO,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
123	{ XFRM_MSG_NEWSPDINFO,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
124	{ XFRM_MSG_GETSPDINFO,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
125	{ XFRM_MSG_MAPPING,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
126	{ XFRM_MSG_SETDEFAULT,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
127	{ XFRM_MSG_GETDEFAULT,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
128};
129
130static const struct nlmsg_perm nlmsg_audit_perms[] =
131{
132	{ AUDIT_GET,		NETLINK_AUDIT_SOCKET__NLMSG_READ     },
133	{ AUDIT_SET,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
134	{ AUDIT_LIST,		NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
135	{ AUDIT_ADD,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
136	{ AUDIT_DEL,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
137	{ AUDIT_LIST_RULES,	NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
138	{ AUDIT_ADD_RULE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
139	{ AUDIT_DEL_RULE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
140	{ AUDIT_USER,		NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
141	{ AUDIT_SIGNAL_INFO,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
142	{ AUDIT_TRIM,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
143	{ AUDIT_MAKE_EQUIV,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
144	{ AUDIT_TTY_GET,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
145	{ AUDIT_TTY_SET,	NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT	},
146	{ AUDIT_GET_FEATURE,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
147	{ AUDIT_SET_FEATURE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
148};
149
150
151static int nlmsg_perm(u16 nlmsg_type, u32 *perm, const struct nlmsg_perm *tab, size_t tabsize)
152{
153	int i, err = -EINVAL;
154
155	for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
156		if (nlmsg_type == tab[i].nlmsg_type) {
157			*perm = tab[i].perm;
158			err = 0;
159			break;
160		}
161
162	return err;
163}
164
165int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
166{
167	int err = 0;
168
169	switch (sclass) {
170	case SECCLASS_NETLINK_ROUTE_SOCKET:
171		/* RTM_MAX always points to RTM_SETxxxx, ie RTM_NEWxxx + 3.
172		 * If the BUILD_BUG_ON() below fails you must update the
173		 * structures at the top of this file with the new mappings
174		 * before updating the BUILD_BUG_ON() macro!
175		 */
176		BUILD_BUG_ON(RTM_MAX != (RTM_NEWVLAN + 3));
177		err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
178				 sizeof(nlmsg_route_perms));
179		break;
180
181	case SECCLASS_NETLINK_TCPDIAG_SOCKET:
182		err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
183				 sizeof(nlmsg_tcpdiag_perms));
184		break;
185
186	case SECCLASS_NETLINK_XFRM_SOCKET:
187		/* If the BUILD_BUG_ON() below fails you must update the
188		 * structures at the top of this file with the new mappings
189		 * before updating the BUILD_BUG_ON() macro!
190		 */
191		BUILD_BUG_ON(XFRM_MSG_MAX != XFRM_MSG_GETDEFAULT);
192		err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
193				 sizeof(nlmsg_xfrm_perms));
194		break;
195
196	case SECCLASS_NETLINK_AUDIT_SOCKET:
197		if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
198		     nlmsg_type <= AUDIT_LAST_USER_MSG) ||
199		    (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
200		     nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
201			*perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
202		} else {
203			err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
204					 sizeof(nlmsg_audit_perms));
205		}
206		break;
207
208	/* No messaging from userspace, or class unknown/unhandled */
209	default:
210		err = -ENOENT;
211		break;
212	}
213
214	return err;
215}
216