1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Netlink message type permission tables, for user generated messages.
*
* Author: James Morris <jmorris@redhat.com>
*
* Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/if.h>
#include <linux/inet_diag.h>
#include <linux/xfrm.h>
#include <linux/audit.h>
#include <linux/sock_diag.h>
#include "flask.h"
#include "av_permissions.h"
#include "security.h"
struct nlmsg_perm {
u16 nlmsg_type;
u32 perm;
};
static const struct nlmsg_perm nlmsg_route_perms[] = {
{ RTM_NEWLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETLINK, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_SETLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_NEWADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETADDR, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETROUTE, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETRULE, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETQDISC, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETACTION, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWPREFIX, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETMULTICAST, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_GETANYCAST, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_GETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_SETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_NEWADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_GETDCB, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_SETDCB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_NEWNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWMDB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELMDB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETMDB, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWNSID, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_GETNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_GETSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_SETSTATS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_NEWCACHEREPORT, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWCHAIN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELCHAIN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETCHAIN, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWNEXTHOP, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELNEXTHOP, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETNEXTHOP, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWLINKPROP, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELLINKPROP, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_NEWVLAN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELVLAN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETVLAN, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_READ },
};
static const struct nlmsg_perm nlmsg_tcpdiag_perms[] = {
{ TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
{ DCCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
{ SOCK_DIAG_BY_FAMILY, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
{ SOCK_DESTROY, NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE },
};
static const struct nlmsg_perm nlmsg_xfrm_perms[] = {
{ XFRM_MSG_NEWSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_DELSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_GETSA, NETLINK_XFRM_SOCKET__NLMSG_READ },
{ XFRM_MSG_NEWPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_DELPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_GETPOLICY, NETLINK_XFRM_SOCKET__NLMSG_READ },
{ XFRM_MSG_ALLOCSPI, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_ACQUIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_EXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_UPDPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_UPDSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_POLEXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_FLUSHSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_NEWAE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_GETAE, NETLINK_XFRM_SOCKET__NLMSG_READ },
{ XFRM_MSG_REPORT, NETLINK_XFRM_SOCKET__NLMSG_READ },
{ XFRM_MSG_MIGRATE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_NEWSADINFO, NETLINK_XFRM_SOCKET__NLMSG_READ },
{ XFRM_MSG_GETSADINFO, NETLINK_XFRM_SOCKET__NLMSG_READ },
{ XFRM_MSG_NEWSPDINFO, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_GETSPDINFO, NETLINK_XFRM_SOCKET__NLMSG_READ },
{ XFRM_MSG_MAPPING, NETLINK_XFRM_SOCKET__NLMSG_READ },
{ XFRM_MSG_SETDEFAULT, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
{ XFRM_MSG_GETDEFAULT, NETLINK_XFRM_SOCKET__NLMSG_READ },
};
static const struct nlmsg_perm nlmsg_audit_perms[] = {
{ AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },
{ AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
{ AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
{ AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
{ AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
{ AUDIT_LIST_RULES, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
{ AUDIT_ADD_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
{ AUDIT_DEL_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
{ AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_RELAY },
{ AUDIT_SIGNAL_INFO, NETLINK_AUDIT_SOCKET__NLMSG_READ },
{ AUDIT_TRIM, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
{ AUDIT_MAKE_EQUIV, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
{ AUDIT_TTY_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },
{ AUDIT_TTY_SET, NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT },
{ AUDIT_GET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_READ },
{ AUDIT_SET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
};
static int nlmsg_perm(u16 nlmsg_type, u32 *perm, const struct nlmsg_perm *tab,
size_t tabsize)
{
unsigned int i;
int err = -EINVAL;
for (i = 0; i < tabsize / sizeof(struct nlmsg_perm); i++)
if (nlmsg_type == tab[i].nlmsg_type) {
*perm = tab[i].perm;
err = 0;
break;
}
return err;
}
int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
{
/* While it is possible to add a similar permission to other netlink
* classes, note that the extended permission value is matched against
* the nlmsg_type field. Notably, SECCLASS_NETLINK_GENERIC_SOCKET uses
* dynamic values for this field, which means that it cannot be added
* as-is.
*/
switch (sclass) {
case SECCLASS_NETLINK_ROUTE_SOCKET:
/* RTM_MAX always points to RTM_SETxxxx, ie RTM_NEWxxx + 3.
* If the BUILD_BUG_ON() below fails you must update the
* structures at the top of this file with the new mappings
* before updating the BUILD_BUG_ON() macro!
*/
BUILD_BUG_ON(RTM_MAX != (RTM_NEWTUNNEL + 3));
if (selinux_policycap_netlink_xperm()) {
*perm = NETLINK_ROUTE_SOCKET__NLMSG;
return 0;
}
return nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
sizeof(nlmsg_route_perms));
break;
case SECCLASS_NETLINK_TCPDIAG_SOCKET:
if (selinux_policycap_netlink_xperm()) {
*perm = NETLINK_TCPDIAG_SOCKET__NLMSG;
return 0;
}
return nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
sizeof(nlmsg_tcpdiag_perms));
break;
case SECCLASS_NETLINK_XFRM_SOCKET:
/* If the BUILD_BUG_ON() below fails you must update the
* structures at the top of this file with the new mappings
* before updating the BUILD_BUG_ON() macro!
*/
BUILD_BUG_ON(XFRM_MSG_MAX != XFRM_MSG_GETDEFAULT);
if (selinux_policycap_netlink_xperm()) {
*perm = NETLINK_XFRM_SOCKET__NLMSG;
return 0;
}
return nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
sizeof(nlmsg_xfrm_perms));
break;
case SECCLASS_NETLINK_AUDIT_SOCKET:
if (selinux_policycap_netlink_xperm()) {
*perm = NETLINK_AUDIT_SOCKET__NLMSG;
return 0;
} else if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
nlmsg_type <= AUDIT_LAST_USER_MSG) ||
(nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
*perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
return 0;
}
return nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
sizeof(nlmsg_audit_perms));
break;
}
/* No messaging from userspace, or class unknown/unhandled */
return -ENOENT;
}
|
