selinux: add support for RTM_NEWCHAIN, RTM_DELCHAIN, and RTM_GETCHAIN
[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/netlink.h>
15 #include <linux/rtnetlink.h>
16 #include <linux/if.h>
17 #include <linux/inet_diag.h>
18 #include <linux/xfrm.h>
19 #include <linux/audit.h>
20 #include <linux/sock_diag.h>
21
22 #include "flask.h"
23 #include "av_permissions.h"
24 #include "security.h"
25
26 struct nlmsg_perm {
27         u16     nlmsg_type;
28         u32     perm;
29 };
30
31 static const 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         { RTM_GETDCB,           NETLINK_ROUTE_SOCKET__NLMSG_READ  },
70         { RTM_SETDCB,           NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
71         { RTM_NEWNETCONF,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
72         { RTM_DELNETCONF,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
73         { RTM_GETNETCONF,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
74         { RTM_NEWMDB,           NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
75         { RTM_DELMDB,           NETLINK_ROUTE_SOCKET__NLMSG_WRITE  },
76         { RTM_GETMDB,           NETLINK_ROUTE_SOCKET__NLMSG_READ  },
77         { RTM_NEWNSID,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
78         { RTM_DELNSID,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
79         { RTM_GETNSID,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
80         { RTM_NEWSTATS,         NETLINK_ROUTE_SOCKET__NLMSG_READ },
81         { RTM_GETSTATS,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
82         { RTM_NEWCACHEREPORT,   NETLINK_ROUTE_SOCKET__NLMSG_READ },
83         { RTM_NEWCHAIN,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
84         { RTM_DELCHAIN,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
85         { RTM_GETCHAIN,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
86 };
87
88 static const struct nlmsg_perm nlmsg_tcpdiag_perms[] =
89 {
90         { TCPDIAG_GETSOCK,      NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
91         { DCCPDIAG_GETSOCK,     NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
92         { SOCK_DIAG_BY_FAMILY,  NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
93         { SOCK_DESTROY,         NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE },
94 };
95
96 static const struct nlmsg_perm nlmsg_xfrm_perms[] =
97 {
98         { XFRM_MSG_NEWSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
99         { XFRM_MSG_DELSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
100         { XFRM_MSG_GETSA,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
101         { XFRM_MSG_NEWPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
102         { XFRM_MSG_DELPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
103         { XFRM_MSG_GETPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_READ  },
104         { XFRM_MSG_ALLOCSPI,    NETLINK_XFRM_SOCKET__NLMSG_WRITE },
105         { XFRM_MSG_ACQUIRE,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
106         { XFRM_MSG_EXPIRE,      NETLINK_XFRM_SOCKET__NLMSG_WRITE },
107         { XFRM_MSG_UPDPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
108         { XFRM_MSG_UPDSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
109         { XFRM_MSG_POLEXPIRE,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
110         { XFRM_MSG_FLUSHSA,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
111         { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
112         { XFRM_MSG_NEWAE,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
113         { XFRM_MSG_GETAE,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
114         { XFRM_MSG_REPORT,      NETLINK_XFRM_SOCKET__NLMSG_READ  },
115         { XFRM_MSG_MIGRATE,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
116         { XFRM_MSG_NEWSADINFO,  NETLINK_XFRM_SOCKET__NLMSG_READ  },
117         { XFRM_MSG_GETSADINFO,  NETLINK_XFRM_SOCKET__NLMSG_READ  },
118         { XFRM_MSG_NEWSPDINFO,  NETLINK_XFRM_SOCKET__NLMSG_WRITE },
119         { XFRM_MSG_GETSPDINFO,  NETLINK_XFRM_SOCKET__NLMSG_READ  },
120         { XFRM_MSG_MAPPING,     NETLINK_XFRM_SOCKET__NLMSG_READ  },
121 };
122
123 static const struct nlmsg_perm nlmsg_audit_perms[] =
124 {
125         { AUDIT_GET,            NETLINK_AUDIT_SOCKET__NLMSG_READ     },
126         { AUDIT_SET,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
127         { AUDIT_LIST,           NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
128         { AUDIT_ADD,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
129         { AUDIT_DEL,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
130         { AUDIT_LIST_RULES,     NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
131         { AUDIT_ADD_RULE,       NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
132         { AUDIT_DEL_RULE,       NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
133         { AUDIT_USER,           NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
134         { AUDIT_SIGNAL_INFO,    NETLINK_AUDIT_SOCKET__NLMSG_READ     },
135         { AUDIT_TRIM,           NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
136         { AUDIT_MAKE_EQUIV,     NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
137         { AUDIT_TTY_GET,        NETLINK_AUDIT_SOCKET__NLMSG_READ     },
138         { AUDIT_TTY_SET,        NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT   },
139         { AUDIT_GET_FEATURE,    NETLINK_AUDIT_SOCKET__NLMSG_READ     },
140         { AUDIT_SET_FEATURE,    NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
141 };
142
143
144 static int nlmsg_perm(u16 nlmsg_type, u32 *perm, const struct nlmsg_perm *tab, size_t tabsize)
145 {
146         int i, err = -EINVAL;
147
148         for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
149                 if (nlmsg_type == tab[i].nlmsg_type) {
150                         *perm = tab[i].perm;
151                         err = 0;
152                         break;
153                 }
154
155         return err;
156 }
157
158 int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
159 {
160         int err = 0;
161
162         switch (sclass) {
163         case SECCLASS_NETLINK_ROUTE_SOCKET:
164                 /* RTM_MAX always points to RTM_SETxxxx, ie RTM_NEWxxx + 3.
165                  * If the BUILD_BUG_ON() below fails you must update the
166                  * structures at the top of this file with the new mappings
167                  * before updating the BUILD_BUG_ON() macro!
168                  */
169                 BUILD_BUG_ON(RTM_MAX != (RTM_NEWCHAIN + 3));
170                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
171                                  sizeof(nlmsg_route_perms));
172                 break;
173
174         case SECCLASS_NETLINK_TCPDIAG_SOCKET:
175                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
176                                  sizeof(nlmsg_tcpdiag_perms));
177                 break;
178
179         case SECCLASS_NETLINK_XFRM_SOCKET:
180                 /* If the BUILD_BUG_ON() below fails you must update the
181                  * structures at the top of this file with the new mappings
182                  * before updating the BUILD_BUG_ON() macro!
183                  */
184                 BUILD_BUG_ON(XFRM_MSG_MAX != XFRM_MSG_MAPPING);
185                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
186                                  sizeof(nlmsg_xfrm_perms));
187                 break;
188
189         case SECCLASS_NETLINK_AUDIT_SOCKET:
190                 if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
191                      nlmsg_type <= AUDIT_LAST_USER_MSG) ||
192                     (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
193                      nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
194                         *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
195                 } else {
196                         err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
197                                          sizeof(nlmsg_audit_perms));
198                 }
199                 break;
200
201         /* No messaging from userspace, or class unknown/unhandled */
202         default:
203                 err = -ENOENT;
204                 break;
205         }
206
207         return err;
208 }