Linux 5.9-rc6
[sfrench/cifs-2.6.git] / security / selinux / nlmsgtab.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Netlink message type permission tables, for user generated messages.
4  *
5  * Author: James Morris <jmorris@redhat.com>
6  *
7  * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
8  */
9 #include <linux/types.h>
10 #include <linux/kernel.h>
11 #include <linux/netlink.h>
12 #include <linux/rtnetlink.h>
13 #include <linux/if.h>
14 #include <linux/inet_diag.h>
15 #include <linux/xfrm.h>
16 #include <linux/audit.h>
17 #include <linux/sock_diag.h>
18
19 #include "flask.h"
20 #include "av_permissions.h"
21 #include "security.h"
22
23 struct nlmsg_perm {
24         u16     nlmsg_type;
25         u32     perm;
26 };
27
28 static const struct nlmsg_perm nlmsg_route_perms[] =
29 {
30         { RTM_NEWLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
31         { RTM_DELLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
32         { RTM_GETLINK,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
33         { RTM_SETLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
34         { RTM_NEWADDR,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
35         { RTM_DELADDR,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
36         { RTM_GETADDR,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
37         { RTM_NEWROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
38         { RTM_DELROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
39         { RTM_GETROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
40         { RTM_NEWNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
41         { RTM_DELNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
42         { RTM_GETNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
43         { RTM_NEWRULE,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
44         { RTM_DELRULE,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
45         { RTM_GETRULE,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
46         { RTM_NEWQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
47         { RTM_DELQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
48         { RTM_GETQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
49         { RTM_NEWTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
50         { RTM_DELTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
51         { RTM_GETTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_READ  },
52         { RTM_NEWTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
53         { RTM_DELTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
54         { RTM_GETTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
55         { RTM_NEWACTION,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
56         { RTM_DELACTION,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
57         { RTM_GETACTION,        NETLINK_ROUTE_SOCKET__NLMSG_READ  },
58         { RTM_NEWPREFIX,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
59         { RTM_GETMULTICAST,     NETLINK_ROUTE_SOCKET__NLMSG_READ  },
60         { RTM_GETANYCAST,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
61         { RTM_GETNEIGHTBL,      NETLINK_ROUTE_SOCKET__NLMSG_READ  },
62         { RTM_SETNEIGHTBL,      NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
63         { RTM_NEWADDRLABEL,     NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
64         { RTM_DELADDRLABEL,     NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
65         { RTM_GETADDRLABEL,     NETLINK_ROUTE_SOCKET__NLMSG_READ  },
66         { RTM_GETDCB,           NETLINK_ROUTE_SOCKET__NLMSG_READ  },
67         { RTM_SETDCB,           NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
68         { RTM_NEWNETCONF,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
69         { RTM_DELNETCONF,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
70         { RTM_GETNETCONF,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
71         { RTM_NEWMDB,           NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
72         { RTM_DELMDB,           NETLINK_ROUTE_SOCKET__NLMSG_WRITE  },
73         { RTM_GETMDB,           NETLINK_ROUTE_SOCKET__NLMSG_READ  },
74         { RTM_NEWNSID,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
75         { RTM_DELNSID,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
76         { RTM_GETNSID,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
77         { RTM_NEWSTATS,         NETLINK_ROUTE_SOCKET__NLMSG_READ },
78         { RTM_GETSTATS,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
79         { RTM_NEWCACHEREPORT,   NETLINK_ROUTE_SOCKET__NLMSG_READ },
80         { RTM_NEWCHAIN,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
81         { RTM_DELCHAIN,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
82         { RTM_GETCHAIN,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
83         { RTM_NEWNEXTHOP,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
84         { RTM_DELNEXTHOP,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
85         { RTM_GETNEXTHOP,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
86         { RTM_NEWLINKPROP,      NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
87         { RTM_DELLINKPROP,      NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
88         { RTM_NEWVLAN,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
89         { RTM_DELVLAN,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
90         { RTM_GETVLAN,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
91 };
92
93 static const struct nlmsg_perm nlmsg_tcpdiag_perms[] =
94 {
95         { TCPDIAG_GETSOCK,      NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
96         { DCCPDIAG_GETSOCK,     NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
97         { SOCK_DIAG_BY_FAMILY,  NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
98         { SOCK_DESTROY,         NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE },
99 };
100
101 static const struct nlmsg_perm nlmsg_xfrm_perms[] =
102 {
103         { XFRM_MSG_NEWSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
104         { XFRM_MSG_DELSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
105         { XFRM_MSG_GETSA,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
106         { XFRM_MSG_NEWPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
107         { XFRM_MSG_DELPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
108         { XFRM_MSG_GETPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_READ  },
109         { XFRM_MSG_ALLOCSPI,    NETLINK_XFRM_SOCKET__NLMSG_WRITE },
110         { XFRM_MSG_ACQUIRE,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
111         { XFRM_MSG_EXPIRE,      NETLINK_XFRM_SOCKET__NLMSG_WRITE },
112         { XFRM_MSG_UPDPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
113         { XFRM_MSG_UPDSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
114         { XFRM_MSG_POLEXPIRE,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
115         { XFRM_MSG_FLUSHSA,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
116         { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
117         { XFRM_MSG_NEWAE,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
118         { XFRM_MSG_GETAE,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
119         { XFRM_MSG_REPORT,      NETLINK_XFRM_SOCKET__NLMSG_READ  },
120         { XFRM_MSG_MIGRATE,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
121         { XFRM_MSG_NEWSADINFO,  NETLINK_XFRM_SOCKET__NLMSG_READ  },
122         { XFRM_MSG_GETSADINFO,  NETLINK_XFRM_SOCKET__NLMSG_READ  },
123         { XFRM_MSG_NEWSPDINFO,  NETLINK_XFRM_SOCKET__NLMSG_WRITE },
124         { XFRM_MSG_GETSPDINFO,  NETLINK_XFRM_SOCKET__NLMSG_READ  },
125         { XFRM_MSG_MAPPING,     NETLINK_XFRM_SOCKET__NLMSG_READ  },
126 };
127
128 static const struct nlmsg_perm nlmsg_audit_perms[] =
129 {
130         { AUDIT_GET,            NETLINK_AUDIT_SOCKET__NLMSG_READ     },
131         { AUDIT_SET,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
132         { AUDIT_LIST,           NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
133         { AUDIT_ADD,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
134         { AUDIT_DEL,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
135         { AUDIT_LIST_RULES,     NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
136         { AUDIT_ADD_RULE,       NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
137         { AUDIT_DEL_RULE,       NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
138         { AUDIT_USER,           NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
139         { AUDIT_SIGNAL_INFO,    NETLINK_AUDIT_SOCKET__NLMSG_READ     },
140         { AUDIT_TRIM,           NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
141         { AUDIT_MAKE_EQUIV,     NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
142         { AUDIT_TTY_GET,        NETLINK_AUDIT_SOCKET__NLMSG_READ     },
143         { AUDIT_TTY_SET,        NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT   },
144         { AUDIT_GET_FEATURE,    NETLINK_AUDIT_SOCKET__NLMSG_READ     },
145         { AUDIT_SET_FEATURE,    NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
146 };
147
148
149 static int nlmsg_perm(u16 nlmsg_type, u32 *perm, const struct nlmsg_perm *tab, size_t tabsize)
150 {
151         int i, err = -EINVAL;
152
153         for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
154                 if (nlmsg_type == tab[i].nlmsg_type) {
155                         *perm = tab[i].perm;
156                         err = 0;
157                         break;
158                 }
159
160         return err;
161 }
162
163 int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
164 {
165         int err = 0;
166
167         switch (sclass) {
168         case SECCLASS_NETLINK_ROUTE_SOCKET:
169                 /* RTM_MAX always points to RTM_SETxxxx, ie RTM_NEWxxx + 3.
170                  * If the BUILD_BUG_ON() below fails you must update the
171                  * structures at the top of this file with the new mappings
172                  * before updating the BUILD_BUG_ON() macro!
173                  */
174                 BUILD_BUG_ON(RTM_MAX != (RTM_NEWVLAN + 3));
175                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
176                                  sizeof(nlmsg_route_perms));
177                 break;
178
179         case SECCLASS_NETLINK_TCPDIAG_SOCKET:
180                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
181                                  sizeof(nlmsg_tcpdiag_perms));
182                 break;
183
184         case SECCLASS_NETLINK_XFRM_SOCKET:
185                 /* If the BUILD_BUG_ON() below fails you must update the
186                  * structures at the top of this file with the new mappings
187                  * before updating the BUILD_BUG_ON() macro!
188                  */
189                 BUILD_BUG_ON(XFRM_MSG_MAX != XFRM_MSG_MAPPING);
190                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
191                                  sizeof(nlmsg_xfrm_perms));
192                 break;
193
194         case SECCLASS_NETLINK_AUDIT_SOCKET:
195                 if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
196                      nlmsg_type <= AUDIT_LAST_USER_MSG) ||
197                     (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
198                      nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
199                         *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
200                 } else {
201                         err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
202                                          sizeof(nlmsg_audit_perms));
203                 }
204                 break;
205
206         /* No messaging from userspace, or class unknown/unhandled */
207         default:
208                 err = -ENOENT;
209                 break;
210         }
211
212         return err;
213 }