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 | |
23 | struct nlmsg_perm { |
24 | u16 nlmsg_type; |
25 | u32 perm; |
26 | }; |
27 | |
28 | static 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 | |
99 | static const struct nlmsg_perm nlmsg_tcpdiag_perms[] = { |
100 | { TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, |
101 | { DCCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, |
102 | { SOCK_DIAG_BY_FAMILY, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, |
103 | { SOCK_DESTROY, NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE }, |
104 | }; |
105 | |
106 | static const struct nlmsg_perm nlmsg_xfrm_perms[] = { |
107 | { XFRM_MSG_NEWSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
108 | { XFRM_MSG_DELSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
109 | { XFRM_MSG_GETSA, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
110 | { XFRM_MSG_NEWPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
111 | { XFRM_MSG_DELPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
112 | { XFRM_MSG_GETPOLICY, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
113 | { XFRM_MSG_ALLOCSPI, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
114 | { XFRM_MSG_ACQUIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
115 | { XFRM_MSG_EXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
116 | { XFRM_MSG_UPDPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
117 | { XFRM_MSG_UPDSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
118 | { XFRM_MSG_POLEXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
119 | { XFRM_MSG_FLUSHSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
120 | { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
121 | { XFRM_MSG_NEWAE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
122 | { XFRM_MSG_GETAE, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
123 | { XFRM_MSG_REPORT, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
124 | { XFRM_MSG_MIGRATE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
125 | { XFRM_MSG_NEWSADINFO, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
126 | { XFRM_MSG_GETSADINFO, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
127 | { XFRM_MSG_NEWSPDINFO, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
128 | { XFRM_MSG_GETSPDINFO, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
129 | { XFRM_MSG_MAPPING, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
130 | { XFRM_MSG_SETDEFAULT, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
131 | { XFRM_MSG_GETDEFAULT, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
132 | }; |
133 | |
134 | static 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 | |
153 | |
154 | static int nlmsg_perm(u16 nlmsg_type, u32 *perm, const struct nlmsg_perm *tab, 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 | |
169 | int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm) |
170 | { |
171 | int err = 0; |
172 | |
173 | switch (sclass) { |
174 | case SECCLASS_NETLINK_ROUTE_SOCKET: |
175 | /* RTM_MAX always points to RTM_SETxxxx, ie RTM_NEWxxx + 3. |
176 | * If the BUILD_BUG_ON() below fails you must update the |
177 | * structures at the top of this file with the new mappings |
178 | * before updating the BUILD_BUG_ON() macro! |
179 | */ |
180 | BUILD_BUG_ON(RTM_MAX != (RTM_NEWTUNNEL + 3)); |
181 | err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms, |
182 | sizeof(nlmsg_route_perms)); |
183 | break; |
184 | |
185 | case SECCLASS_NETLINK_TCPDIAG_SOCKET: |
186 | err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms, |
187 | sizeof(nlmsg_tcpdiag_perms)); |
188 | break; |
189 | |
190 | case SECCLASS_NETLINK_XFRM_SOCKET: |
191 | /* If the BUILD_BUG_ON() below fails you must update the |
192 | * structures at the top of this file with the new mappings |
193 | * before updating the BUILD_BUG_ON() macro! |
194 | */ |
195 | BUILD_BUG_ON(XFRM_MSG_MAX != XFRM_MSG_GETDEFAULT); |
196 | err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms, |
197 | sizeof(nlmsg_xfrm_perms)); |
198 | break; |
199 | |
200 | case SECCLASS_NETLINK_AUDIT_SOCKET: |
201 | if ((nlmsg_type >= AUDIT_FIRST_USER_MSG && |
202 | nlmsg_type <= AUDIT_LAST_USER_MSG) || |
203 | (nlmsg_type >= AUDIT_FIRST_USER_MSG2 && |
204 | nlmsg_type <= AUDIT_LAST_USER_MSG2)) { |
205 | *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY; |
206 | } else { |
207 | err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms, |
208 | sizeof(nlmsg_audit_perms)); |
209 | } |
210 | break; |
211 | |
212 | /* No messaging from userspace, or class unknown/unhandled */ |
213 | default: |
214 | err = -ENOENT; |
215 | break; |
216 | } |
217 | |
218 | return err; |
219 | } |
220 | |