[PATCH] SELinux: fix bug in Netlink message type detection
[linux-3.10.git] / security / selinux / nlmsgtab.c
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/tcp_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 {
28         u16     nlmsg_type;
29         u32     perm;
30 };
31
32 static struct nlmsg_perm nlmsg_route_perms[] =
33 {
34         { RTM_NEWLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
35         { RTM_DELLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
36         { RTM_GETLINK,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
37         { RTM_SETLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
38         { RTM_NEWADDR,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
39         { RTM_DELADDR,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
40         { RTM_GETADDR,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
41         { RTM_NEWROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
42         { RTM_DELROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
43         { RTM_GETROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
44         { RTM_NEWNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
45         { RTM_DELNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
46         { RTM_GETNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
47         { RTM_NEWRULE,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
48         { RTM_DELRULE,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
49         { RTM_GETRULE,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
50         { RTM_NEWQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
51         { RTM_DELQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
52         { RTM_GETQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
53         { RTM_NEWTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
54         { RTM_DELTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
55         { RTM_GETTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_READ  },
56         { RTM_NEWTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
57         { RTM_DELTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
58         { RTM_GETTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
59         { RTM_NEWACTION,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
60         { RTM_DELACTION,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
61         { RTM_GETACTION,        NETLINK_ROUTE_SOCKET__NLMSG_READ  },
62         { RTM_NEWPREFIX,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
63         { RTM_GETPREFIX,        NETLINK_ROUTE_SOCKET__NLMSG_READ  },
64         { RTM_GETMULTICAST,     NETLINK_ROUTE_SOCKET__NLMSG_READ  },
65         { RTM_GETANYCAST,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
66 };
67
68 static struct nlmsg_perm nlmsg_firewall_perms[] =
69 {
70         { IPQM_MODE,            NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
71         { IPQM_VERDICT,         NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
72 };
73
74 static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
75 {
76         { TCPDIAG_GETSOCK,      NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
77 };
78
79 static struct nlmsg_perm nlmsg_xfrm_perms[] =
80 {
81         { XFRM_MSG_NEWSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
82         { XFRM_MSG_DELSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
83         { XFRM_MSG_GETSA,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
84         { XFRM_MSG_NEWPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
85         { XFRM_MSG_DELPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
86         { XFRM_MSG_GETPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_READ  },
87         { XFRM_MSG_ALLOCSPI,    NETLINK_XFRM_SOCKET__NLMSG_WRITE },
88         { XFRM_MSG_UPDPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
89         { XFRM_MSG_UPDSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
90 };
91
92 static struct nlmsg_perm nlmsg_audit_perms[] =
93 {
94         { AUDIT_GET,            NETLINK_AUDIT_SOCKET__NLMSG_READ  },
95         { AUDIT_SET,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
96         { AUDIT_LIST,           NETLINK_AUDIT_SOCKET__NLMSG_READ  },
97         { AUDIT_ADD,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
98         { AUDIT_DEL,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
99         { AUDIT_USER,           NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
100         { AUDIT_LOGIN,          NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
101 };
102
103
104 static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize)
105 {
106         int i, err = -EINVAL;
107
108         for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
109                 if (nlmsg_type == tab[i].nlmsg_type) {
110                         *perm = tab[i].perm;
111                         err = 0;
112                         break;
113                 }
114
115         return err;
116 }
117
118 int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
119 {
120         int err = 0;
121
122         switch (sclass) {
123         case SECCLASS_NETLINK_ROUTE_SOCKET:
124                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
125                                  sizeof(nlmsg_route_perms));
126                 break;
127
128         case SECCLASS_NETLINK_FIREWALL_SOCKET:
129         case SECCLASS_NETLINK_IP6FW_SOCKET:
130                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_firewall_perms,
131                                  sizeof(nlmsg_firewall_perms));
132                 break;
133
134         case SECCLASS_NETLINK_TCPDIAG_SOCKET:
135                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
136                                  sizeof(nlmsg_tcpdiag_perms));
137                 break;
138
139         case SECCLASS_NETLINK_XFRM_SOCKET:
140                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
141                                  sizeof(nlmsg_xfrm_perms));
142                 break;
143
144         case SECCLASS_NETLINK_AUDIT_SOCKET:
145                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
146                                  sizeof(nlmsg_audit_perms));
147                 break;
148
149         /* No messaging from userspace, or class unknown/unhandled */
150         default:
151                 err = -ENOENT;
152                 break;
153         }
154
155         return err;
156 }