xref: /linux/security/selinux/nlmsgtab.c (revision c4ee0af3fa0dc65f690fc908f02b8355f9576ea0)
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 
21 #include "flask.h"
22 #include "av_permissions.h"
23 #include "security.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 	{ RTM_GETDCB,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
69 	{ RTM_SETDCB,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
70 	{ RTM_NEWNETCONF,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
71 	{ RTM_GETNETCONF,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
72 	{ RTM_NEWMDB,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
73 	{ RTM_DELMDB,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE  },
74 	{ RTM_GETMDB,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
75 };
76 
77 static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
78 {
79 	{ TCPDIAG_GETSOCK,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
80 	{ DCCPDIAG_GETSOCK,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
81 };
82 
83 static struct nlmsg_perm nlmsg_xfrm_perms[] =
84 {
85 	{ XFRM_MSG_NEWSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
86 	{ XFRM_MSG_DELSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
87 	{ XFRM_MSG_GETSA,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
88 	{ XFRM_MSG_NEWPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
89 	{ XFRM_MSG_DELPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
90 	{ XFRM_MSG_GETPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
91 	{ XFRM_MSG_ALLOCSPI,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
92 	{ XFRM_MSG_ACQUIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
93 	{ XFRM_MSG_EXPIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
94 	{ XFRM_MSG_UPDPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
95 	{ XFRM_MSG_UPDSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
96 	{ XFRM_MSG_POLEXPIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
97 	{ XFRM_MSG_FLUSHSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
98 	{ XFRM_MSG_FLUSHPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
99 	{ XFRM_MSG_NEWAE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
100 	{ XFRM_MSG_GETAE,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
101 };
102 
103 static struct nlmsg_perm nlmsg_audit_perms[] =
104 {
105 	{ AUDIT_GET,		NETLINK_AUDIT_SOCKET__NLMSG_READ     },
106 	{ AUDIT_SET,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
107 	{ AUDIT_LIST,		NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
108 	{ AUDIT_ADD,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
109 	{ AUDIT_DEL,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
110 	{ AUDIT_LIST_RULES,	NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
111 	{ AUDIT_ADD_RULE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
112 	{ AUDIT_DEL_RULE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
113 	{ AUDIT_USER,		NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
114 	{ AUDIT_SIGNAL_INFO,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
115 	{ AUDIT_TRIM,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
116 	{ AUDIT_MAKE_EQUIV,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
117 	{ AUDIT_TTY_GET,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
118 	{ AUDIT_TTY_SET,	NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT	},
119 	{ AUDIT_GET_FEATURE,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
120 	{ AUDIT_SET_FEATURE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
121 };
122 
123 
124 static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize)
125 {
126 	int i, err = -EINVAL;
127 
128 	for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
129 		if (nlmsg_type == tab[i].nlmsg_type) {
130 			*perm = tab[i].perm;
131 			err = 0;
132 			break;
133 		}
134 
135 	return err;
136 }
137 
138 int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
139 {
140 	int err = 0;
141 
142 	switch (sclass) {
143 	case SECCLASS_NETLINK_ROUTE_SOCKET:
144 		err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
145 				 sizeof(nlmsg_route_perms));
146 		break;
147 
148 	case SECCLASS_NETLINK_TCPDIAG_SOCKET:
149 		err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
150 				 sizeof(nlmsg_tcpdiag_perms));
151 		break;
152 
153 	case SECCLASS_NETLINK_XFRM_SOCKET:
154 		err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
155 				 sizeof(nlmsg_xfrm_perms));
156 		break;
157 
158 	case SECCLASS_NETLINK_AUDIT_SOCKET:
159 		if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
160 		     nlmsg_type <= AUDIT_LAST_USER_MSG) ||
161 		    (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
162 		     nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
163 			*perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
164 		} else {
165 			err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
166 					 sizeof(nlmsg_audit_perms));
167 		}
168 		break;
169 
170 	/* No messaging from userspace, or class unknown/unhandled */
171 	default:
172 		err = -ENOENT;
173 		break;
174 	}
175 
176 	return err;
177 }
178