Root/
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/netlink.h> |
15 | #include <linux/rtnetlink.h> |
16 | #include <linux/if.h> |
17 | #include <linux/netfilter_ipv4/ip_queue.h> |
18 | #include <linux/inet_diag.h> |
19 | #include <linux/xfrm.h> |
20 | #include <linux/audit.h> |
21 | |
22 | #include "flask.h" |
23 | #include "av_permissions.h" |
24 | |
25 | struct nlmsg_perm { |
26 | u16 nlmsg_type; |
27 | u32 perm; |
28 | }; |
29 | |
30 | static struct nlmsg_perm nlmsg_route_perms[] = |
31 | { |
32 | { RTM_NEWLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
33 | { RTM_DELLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
34 | { RTM_GETLINK, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
35 | { RTM_SETLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
36 | { RTM_NEWADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
37 | { RTM_DELADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
38 | { RTM_GETADDR, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
39 | { RTM_NEWROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
40 | { RTM_DELROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
41 | { RTM_GETROUTE, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
42 | { RTM_NEWNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
43 | { RTM_DELNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
44 | { RTM_GETNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
45 | { RTM_NEWRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
46 | { RTM_DELRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
47 | { RTM_GETRULE, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
48 | { RTM_NEWQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
49 | { RTM_DELQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
50 | { RTM_GETQDISC, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
51 | { RTM_NEWTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
52 | { RTM_DELTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
53 | { RTM_GETTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
54 | { RTM_NEWTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
55 | { RTM_DELTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
56 | { RTM_GETTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
57 | { RTM_NEWACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
58 | { RTM_DELACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
59 | { RTM_GETACTION, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
60 | { RTM_NEWPREFIX, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
61 | { RTM_GETMULTICAST, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
62 | { RTM_GETANYCAST, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
63 | { RTM_GETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
64 | { RTM_SETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
65 | { RTM_NEWADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
66 | { RTM_DELADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
67 | { RTM_GETADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
68 | }; |
69 | |
70 | static struct nlmsg_perm nlmsg_firewall_perms[] = |
71 | { |
72 | { IPQM_MODE, NETLINK_FIREWALL_SOCKET__NLMSG_WRITE }, |
73 | { IPQM_VERDICT, NETLINK_FIREWALL_SOCKET__NLMSG_WRITE }, |
74 | }; |
75 | |
76 | static struct nlmsg_perm nlmsg_tcpdiag_perms[] = |
77 | { |
78 | { TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, |
79 | { DCCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, |
80 | }; |
81 | |
82 | static struct nlmsg_perm nlmsg_xfrm_perms[] = |
83 | { |
84 | { XFRM_MSG_NEWSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
85 | { XFRM_MSG_DELSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
86 | { XFRM_MSG_GETSA, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
87 | { XFRM_MSG_NEWPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
88 | { XFRM_MSG_DELPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
89 | { XFRM_MSG_GETPOLICY, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
90 | { XFRM_MSG_ALLOCSPI, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
91 | { XFRM_MSG_ACQUIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
92 | { XFRM_MSG_EXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
93 | { XFRM_MSG_UPDPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
94 | { XFRM_MSG_UPDSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
95 | { XFRM_MSG_POLEXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
96 | { XFRM_MSG_FLUSHSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
97 | { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
98 | { XFRM_MSG_NEWAE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
99 | { XFRM_MSG_GETAE, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
100 | }; |
101 | |
102 | static struct nlmsg_perm nlmsg_audit_perms[] = |
103 | { |
104 | { AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ }, |
105 | { AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
106 | { AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV }, |
107 | { AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
108 | { AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
109 | { AUDIT_LIST_RULES, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV }, |
110 | { AUDIT_ADD_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
111 | { AUDIT_DEL_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
112 | { AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_RELAY }, |
113 | { AUDIT_SIGNAL_INFO, NETLINK_AUDIT_SOCKET__NLMSG_READ }, |
114 | { AUDIT_TRIM, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
115 | { AUDIT_MAKE_EQUIV, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
116 | { AUDIT_TTY_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ }, |
117 | { AUDIT_TTY_SET, NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT }, |
118 | }; |
119 | |
120 | |
121 | static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize) |
122 | { |
123 | int i, err = -EINVAL; |
124 | |
125 | for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++) |
126 | if (nlmsg_type == tab[i].nlmsg_type) { |
127 | *perm = tab[i].perm; |
128 | err = 0; |
129 | break; |
130 | } |
131 | |
132 | return err; |
133 | } |
134 | |
135 | int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm) |
136 | { |
137 | int err = 0; |
138 | |
139 | switch (sclass) { |
140 | case SECCLASS_NETLINK_ROUTE_SOCKET: |
141 | err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms, |
142 | sizeof(nlmsg_route_perms)); |
143 | break; |
144 | |
145 | case SECCLASS_NETLINK_FIREWALL_SOCKET: |
146 | case SECCLASS_NETLINK_IP6FW_SOCKET: |
147 | err = nlmsg_perm(nlmsg_type, perm, nlmsg_firewall_perms, |
148 | sizeof(nlmsg_firewall_perms)); |
149 | break; |
150 | |
151 | case SECCLASS_NETLINK_TCPDIAG_SOCKET: |
152 | err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms, |
153 | sizeof(nlmsg_tcpdiag_perms)); |
154 | break; |
155 | |
156 | case SECCLASS_NETLINK_XFRM_SOCKET: |
157 | err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms, |
158 | sizeof(nlmsg_xfrm_perms)); |
159 | break; |
160 | |
161 | case SECCLASS_NETLINK_AUDIT_SOCKET: |
162 | if ((nlmsg_type >= AUDIT_FIRST_USER_MSG && |
163 | nlmsg_type <= AUDIT_LAST_USER_MSG) || |
164 | (nlmsg_type >= AUDIT_FIRST_USER_MSG2 && |
165 | nlmsg_type <= AUDIT_LAST_USER_MSG2)) { |
166 | *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY; |
167 | } else { |
168 | err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms, |
169 | sizeof(nlmsg_audit_perms)); |
170 | } |
171 | break; |
172 | |
173 | /* No messaging from userspace, or class unknown/unhandled */ |
174 | default: |
175 | err = -ENOENT; |
176 | break; |
177 | } |
178 | |
179 | return err; |
180 | } |
181 |
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