documentation: convert the Documentation directory to UTF-8
[sfrench/cifs-2.6.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/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 {
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_GETMULTICAST,     NETLINK_ROUTE_SOCKET__NLMSG_READ  },
64         { RTM_GETANYCAST,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
65         { RTM_GETNEIGHTBL,      NETLINK_ROUTE_SOCKET__NLMSG_READ  },
66         { RTM_SETNEIGHTBL,      NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
67 };
68
69 static struct nlmsg_perm nlmsg_firewall_perms[] =
70 {
71         { IPQM_MODE,            NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
72         { IPQM_VERDICT,         NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
73 };
74
75 static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
76 {
77         { TCPDIAG_GETSOCK,      NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
78         { DCCPDIAG_GETSOCK,     NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
79 };
80
81 static struct nlmsg_perm nlmsg_xfrm_perms[] =
82 {
83         { XFRM_MSG_NEWSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
84         { XFRM_MSG_DELSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
85         { XFRM_MSG_GETSA,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
86         { XFRM_MSG_NEWPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
87         { XFRM_MSG_DELPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
88         { XFRM_MSG_GETPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_READ  },
89         { XFRM_MSG_ALLOCSPI,    NETLINK_XFRM_SOCKET__NLMSG_WRITE },
90         { XFRM_MSG_ACQUIRE,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
91         { XFRM_MSG_EXPIRE,      NETLINK_XFRM_SOCKET__NLMSG_WRITE },
92         { XFRM_MSG_UPDPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
93         { XFRM_MSG_UPDSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
94         { XFRM_MSG_POLEXPIRE,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
95         { XFRM_MSG_FLUSHSA,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
96         { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
97         { XFRM_MSG_NEWAE,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
98         { XFRM_MSG_GETAE,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
99 };
100
101 static struct nlmsg_perm nlmsg_audit_perms[] =
102 {
103         { AUDIT_GET,            NETLINK_AUDIT_SOCKET__NLMSG_READ     },
104         { AUDIT_SET,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
105         { AUDIT_LIST,           NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
106         { AUDIT_ADD,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
107         { AUDIT_DEL,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
108         { AUDIT_LIST_RULES,     NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
109         { AUDIT_ADD_RULE,       NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
110         { AUDIT_DEL_RULE,       NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
111         { AUDIT_USER,           NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
112         { AUDIT_SIGNAL_INFO,    NETLINK_AUDIT_SOCKET__NLMSG_READ     },
113 };
114
115
116 static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize)
117 {
118         int i, err = -EINVAL;
119
120         for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
121                 if (nlmsg_type == tab[i].nlmsg_type) {
122                         *perm = tab[i].perm;
123                         err = 0;
124                         break;
125                 }
126
127         return err;
128 }
129
130 int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
131 {
132         int err = 0;
133
134         switch (sclass) {
135         case SECCLASS_NETLINK_ROUTE_SOCKET:
136                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
137                                  sizeof(nlmsg_route_perms));
138                 break;
139
140         case SECCLASS_NETLINK_FIREWALL_SOCKET:
141         case SECCLASS_NETLINK_IP6FW_SOCKET:
142                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_firewall_perms,
143                                  sizeof(nlmsg_firewall_perms));
144                 break;
145
146         case SECCLASS_NETLINK_TCPDIAG_SOCKET:
147                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
148                                  sizeof(nlmsg_tcpdiag_perms));
149                 break;
150
151         case SECCLASS_NETLINK_XFRM_SOCKET:
152                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
153                                  sizeof(nlmsg_xfrm_perms));
154                 break;
155
156         case SECCLASS_NETLINK_AUDIT_SOCKET:
157                 if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
158                      nlmsg_type <= AUDIT_LAST_USER_MSG) ||
159                     (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
160                      nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
161                         *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
162                 } else {
163                         err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
164                                          sizeof(nlmsg_audit_perms));
165                 }
166                 break;
167
168         /* No messaging from userspace, or class unknown/unhandled */
169         default:
170                 err = -ENOENT;
171                 break;
172         }
173
174         return err;
175 }