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/inet_diag.h>
20 #include <linux/xfrm.h>
21 #include <linux/audit.h>
22
23 #include "flask.h"
24 #include "av_permissions.h"
25
26 struct nlmsg_perm {
27 u16 nlmsg_type;
28 u32 perm;
29 };
30
31 static struct nlmsg_perm nlmsg_route_perms[] =
32 {
33 { RTM_NEWLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
34 { RTM_DELLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
35 { RTM_GETLINK, NETLINK_ROUTE_SOCKET__NLMSG_READ },
36 { RTM_SETLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
37 { RTM_NEWADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
38 { RTM_DELADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
39 { RTM_GETADDR, NETLINK_ROUTE_SOCKET__NLMSG_READ },
40 { RTM_NEWROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
41 { RTM_DELROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
42 { RTM_GETROUTE, NETLINK_ROUTE_SOCKET__NLMSG_READ },
43 { RTM_NEWNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
44 { RTM_DELNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
45 { RTM_GETNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_READ },
46 { RTM_NEWRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
47 { RTM_DELRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
48 { RTM_GETRULE, NETLINK_ROUTE_SOCKET__NLMSG_READ },
49 { RTM_NEWQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
50 { RTM_DELQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
51 { RTM_GETQDISC, NETLINK_ROUTE_SOCKET__NLMSG_READ },
52 { RTM_NEWTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
53 { RTM_DELTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
54 { RTM_GETTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_READ },
55 { RTM_NEWTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
56 { RTM_DELTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
57 { RTM_GETTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_READ },
58 { RTM_NEWACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
59 { RTM_DELACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
60 { RTM_GETACTION, NETLINK_ROUTE_SOCKET__NLMSG_READ },
61 { RTM_NEWPREFIX, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
62 { RTM_GETMULTICAST, NETLINK_ROUTE_SOCKET__NLMSG_READ },
63 { RTM_GETANYCAST, NETLINK_ROUTE_SOCKET__NLMSG_READ },
64 { RTM_GETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_READ },
65 { RTM_SETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
66 { RTM_NEWADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
67 { RTM_DELADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
68 { RTM_GETADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_READ },
69 };
70
71 static struct nlmsg_perm nlmsg_firewall_perms[] =
72 {
73 { IPQM_MODE, NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
74 { IPQM_VERDICT, NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
75 };
76
77 static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
78 {
79 { TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
80 { DCCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
81 };
82
83 static struct nlmsg_perm nlmsg_xfrm_perms[] =
84 {
85 { XFRM_MSG_NEWSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
86 { XFRM_MSG_DELSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
87 { XFRM_MSG_GETSA, NETLINK_XFRM_SOCKET__NLMSG_READ },
88 { XFRM_MSG_NEWPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
89 { XFRM_MSG_DELPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
90 { XFRM_MSG_GETPOLICY, NETLINK_XFRM_SOCKET__NLMSG_READ },
91 { XFRM_MSG_ALLOCSPI, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
92 { XFRM_MSG_ACQUIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
93 { XFRM_MSG_EXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
94 { XFRM_MSG_UPDPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
95 { XFRM_MSG_UPDSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
96 { XFRM_MSG_POLEXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
97 { XFRM_MSG_FLUSHSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
98 { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
99 { XFRM_MSG_NEWAE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
100 { XFRM_MSG_GETAE, NETLINK_XFRM_SOCKET__NLMSG_READ },
101 };
102
103 static struct nlmsg_perm nlmsg_audit_perms[] =
104 {
105 { AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },
106 { AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
107 { AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
108 { AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
109 { AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
110 { AUDIT_LIST_RULES, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
111 { AUDIT_ADD_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
112 { AUDIT_DEL_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
113 { AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_RELAY },
114 { AUDIT_SIGNAL_INFO, NETLINK_AUDIT_SOCKET__NLMSG_READ },
115 { AUDIT_TRIM, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
116 { AUDIT_MAKE_EQUIV, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
117 { AUDIT_TTY_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },
118 { AUDIT_TTY_SET, NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT },
119 };
120
121
122 static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize)
123 {
124 int i, err = -EINVAL;
125
126 for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
127 if (nlmsg_type == tab[i].nlmsg_type) {
128 *perm = tab[i].perm;
129 err = 0;
130 break;
131 }
132
133 return err;
134 }
135
136 int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
137 {
138 int err = 0;
139
140 switch (sclass) {
141 case SECCLASS_NETLINK_ROUTE_SOCKET:
142 err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
143 sizeof(nlmsg_route_perms));
144 break;
145
146 case SECCLASS_NETLINK_FIREWALL_SOCKET:
147 case SECCLASS_NETLINK_IP6FW_SOCKET:
148 err = nlmsg_perm(nlmsg_type, perm, nlmsg_firewall_perms,
149 sizeof(nlmsg_firewall_perms));
150 break;
151
152 case SECCLASS_NETLINK_TCPDIAG_SOCKET:
153 err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
154 sizeof(nlmsg_tcpdiag_perms));
155 break;
156
157 case SECCLASS_NETLINK_XFRM_SOCKET:
158 err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
159 sizeof(nlmsg_xfrm_perms));
160 break;
161
162 case SECCLASS_NETLINK_AUDIT_SOCKET:
163 if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
164 nlmsg_type <= AUDIT_LAST_USER_MSG) ||
165 (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
166 nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
167 *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
168 } else {
169 err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
170 sizeof(nlmsg_audit_perms));
171 }
172 break;
173
174 /* No messaging from userspace, or class unknown/unhandled */
175 default:
176 err = -ENOENT;
177 break;
178 }
179
180 return err;
181 }
182
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