projects/linux·blob master · refs

234 lines · 9.4 KiB

1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Netlink message type permission tables, for user generated messages.
4 *
5 * Author: James Morris <[email protected]>
6 *
7 * Copyright (C) 2004 Red Hat, Inc., James Morris <[email protected]>
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 { RTM_NEWLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
30 { RTM_DELLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
31 { RTM_GETLINK, NETLINK_ROUTE_SOCKET__NLMSG_READ },
32 { RTM_SETLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
33 { RTM_NEWADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
34 { RTM_DELADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
35 { RTM_GETADDR, NETLINK_ROUTE_SOCKET__NLMSG_READ },
36 { RTM_NEWROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
37 { RTM_DELROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
38 { RTM_GETROUTE, NETLINK_ROUTE_SOCKET__NLMSG_READ },
39 { RTM_NEWNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
40 { RTM_DELNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
41 { RTM_GETNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_READ },
42 { RTM_NEWRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
43 { RTM_DELRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
44 { RTM_GETRULE, NETLINK_ROUTE_SOCKET__NLMSG_READ },
45 { RTM_NEWQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
46 { RTM_DELQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
47 { RTM_GETQDISC, NETLINK_ROUTE_SOCKET__NLMSG_READ },
48 { RTM_NEWTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
49 { RTM_DELTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
50 { RTM_GETTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_READ },
51 { RTM_NEWTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
52 { RTM_DELTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
53 { RTM_GETTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_READ },
54 { RTM_NEWACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
55 { RTM_DELACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
56 { RTM_GETACTION, NETLINK_ROUTE_SOCKET__NLMSG_READ },
57 { RTM_NEWPREFIX, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
58 { RTM_GETMULTICAST, NETLINK_ROUTE_SOCKET__NLMSG_READ },
59 { RTM_GETANYCAST, NETLINK_ROUTE_SOCKET__NLMSG_READ },
60 { RTM_GETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_READ },
61 { RTM_SETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
62 { RTM_NEWADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
63 { RTM_DELADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
64 { RTM_GETADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_READ },
65 { RTM_GETDCB, NETLINK_ROUTE_SOCKET__NLMSG_READ },
66 { RTM_SETDCB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
67 { RTM_NEWNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
68 { RTM_DELNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
69 { RTM_GETNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_READ },
70 { RTM_NEWMDB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
71 { RTM_DELMDB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
72 { RTM_GETMDB, NETLINK_ROUTE_SOCKET__NLMSG_READ },
73 { RTM_NEWNSID, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
74 { RTM_DELNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ },
75 { RTM_GETNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ },
76 { RTM_NEWSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ },
77 { RTM_GETSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ },
78 { RTM_SETSTATS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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 { RTM_NEWNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
92 { RTM_DELNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
93 { RTM_GETNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_READ },
94 { RTM_NEWTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
95 { RTM_DELTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
96 { RTM_GETTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_READ },
97};
98
99static const struct nlmsg_perm nlmsg_tcpdiag_perms[] = {
100 { TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
101 { SOCK_DIAG_BY_FAMILY, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
102 { SOCK_DESTROY, NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE },
103};
104
105static const struct nlmsg_perm nlmsg_xfrm_perms[] = {
106 { XFRM_MSG_NEWSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
107 { XFRM_MSG_DELSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
108 { XFRM_MSG_GETSA, NETLINK_XFRM_SOCKET__NLMSG_READ },
109 { XFRM_MSG_NEWPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
110 { XFRM_MSG_DELPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
111 { XFRM_MSG_GETPOLICY, NETLINK_XFRM_SOCKET__NLMSG_READ },
112 { XFRM_MSG_ALLOCSPI, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
113 { XFRM_MSG_ACQUIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
114 { XFRM_MSG_EXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
115 { XFRM_MSG_UPDPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
116 { XFRM_MSG_UPDSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
117 { XFRM_MSG_POLEXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
118 { XFRM_MSG_FLUSHSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
119 { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
120 { XFRM_MSG_NEWAE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
121 { XFRM_MSG_GETAE, NETLINK_XFRM_SOCKET__NLMSG_READ },
122 { XFRM_MSG_REPORT, NETLINK_XFRM_SOCKET__NLMSG_READ },
123 { XFRM_MSG_MIGRATE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
124 { XFRM_MSG_NEWSADINFO, NETLINK_XFRM_SOCKET__NLMSG_READ },
125 { XFRM_MSG_GETSADINFO, NETLINK_XFRM_SOCKET__NLMSG_READ },
126 { XFRM_MSG_NEWSPDINFO, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
127 { XFRM_MSG_GETSPDINFO, NETLINK_XFRM_SOCKET__NLMSG_READ },
128 { XFRM_MSG_MAPPING, NETLINK_XFRM_SOCKET__NLMSG_READ },
129 { XFRM_MSG_SETDEFAULT, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
130 { XFRM_MSG_GETDEFAULT, NETLINK_XFRM_SOCKET__NLMSG_READ },
131 { XFRM_MSG_MIGRATE_STATE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
132};
133
134static const struct nlmsg_perm nlmsg_audit_perms[] = {
135 { AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },
136 { AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
137 { AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
138 { AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
139 { AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
140 { AUDIT_LIST_RULES, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
141 { AUDIT_ADD_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
142 { AUDIT_DEL_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
143 { AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_RELAY },
144 { AUDIT_SIGNAL_INFO, NETLINK_AUDIT_SOCKET__NLMSG_READ },
145 { AUDIT_TRIM, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
146 { AUDIT_MAKE_EQUIV, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
147 { AUDIT_TTY_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },
148 { AUDIT_TTY_SET, NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT },
149 { AUDIT_GET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_READ },
150 { AUDIT_SET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
151};
152
153static int nlmsg_perm(u16 nlmsg_type, u32 *perm, const struct nlmsg_perm *tab,
154 size_t tabsize)
155{
156 unsigned int i;
157 int err = -EINVAL;
158
159 for (i = 0; i < tabsize / sizeof(struct nlmsg_perm); i++)
160 if (nlmsg_type == tab[i].nlmsg_type) {
161 *perm = tab[i].perm;
162 err = 0;
163 break;
164 }
165
166 return err;
167}
168
169int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
170{
171 /* While it is possible to add a similar permission to other netlink
172 * classes, note that the extended permission value is matched against
173 * the nlmsg_type field. Notably, SECCLASS_NETLINK_GENERIC_SOCKET uses
174 * dynamic values for this field, which means that it cannot be added
175 * as-is.
176 */
177
178 switch (sclass) {
179 case SECCLASS_NETLINK_ROUTE_SOCKET:
180 /* RTM_MAX always points to RTM_SETxxxx, ie RTM_NEWxxx + 3.
181 * If the BUILD_BUG_ON() below fails you must update the
182 * structures at the top of this file with the new mappings
183 * before updating the BUILD_BUG_ON() macro!
184 */
185 BUILD_BUG_ON(RTM_MAX != (RTM_NEWTUNNEL + 3));
186
187 if (selinux_policycap_netlink_xperm()) {
188 *perm = NETLINK_ROUTE_SOCKET__NLMSG;
189 return 0;
190 }
191 return nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
192 sizeof(nlmsg_route_perms));
193 break;
194 case SECCLASS_NETLINK_TCPDIAG_SOCKET:
195 if (selinux_policycap_netlink_xperm()) {
196 *perm = NETLINK_TCPDIAG_SOCKET__NLMSG;
197 return 0;
198 }
199 return nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
200 sizeof(nlmsg_tcpdiag_perms));
201 break;
202 case SECCLASS_NETLINK_XFRM_SOCKET:
203 /* If the BUILD_BUG_ON() below fails you must update the
204 * structures at the top of this file with the new mappings
205 * before updating the BUILD_BUG_ON() macro!
206 */
207 BUILD_BUG_ON(XFRM_MSG_MAX != XFRM_MSG_MIGRATE_STATE);
208
209 if (selinux_policycap_netlink_xperm()) {
210 *perm = NETLINK_XFRM_SOCKET__NLMSG;
211 return 0;
212 }
213 return nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
214 sizeof(nlmsg_xfrm_perms));
215 break;
216 case SECCLASS_NETLINK_AUDIT_SOCKET:
217 if (selinux_policycap_netlink_xperm()) {
218 *perm = NETLINK_AUDIT_SOCKET__NLMSG;
219 return 0;
220 } else if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
221 nlmsg_type <= AUDIT_LAST_USER_MSG) ||
222 (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
223 nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
224 *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
225 return 0;
226 }
227 return nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
228 sizeof(nlmsg_audit_perms));
229 break;
230 }
231
232 /* No messaging from userspace, or class unknown/unhandled */
233 return -ENOENT;
234}