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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 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_GETNETCONF,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
73 	{ RTM_NEWMDB,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
74 	{ RTM_DELMDB,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE  },
75 	{ RTM_GETMDB,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
76 	{ RTM_NEWNSID,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
77 	{ RTM_GETNSID,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
78 };
79 
80 static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
81 {
82 	{ TCPDIAG_GETSOCK,		NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
83 	{ DCCPDIAG_GETSOCK,		NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
84 	{ SOCK_DIAG_BY_FAMILY,		NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
85 	{ SOCK_DESTROY_BACKPORT,	NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE },
86 };
87 
88 static struct nlmsg_perm nlmsg_xfrm_perms[] =
89 {
90 	{ XFRM_MSG_NEWSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
91 	{ XFRM_MSG_DELSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
92 	{ XFRM_MSG_GETSA,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
93 	{ XFRM_MSG_NEWPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
94 	{ XFRM_MSG_DELPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
95 	{ XFRM_MSG_GETPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
96 	{ XFRM_MSG_ALLOCSPI,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
97 	{ XFRM_MSG_ACQUIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
98 	{ XFRM_MSG_EXPIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
99 	{ XFRM_MSG_UPDPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
100 	{ XFRM_MSG_UPDSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
101 	{ XFRM_MSG_POLEXPIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
102 	{ XFRM_MSG_FLUSHSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
103 	{ XFRM_MSG_FLUSHPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
104 	{ XFRM_MSG_NEWAE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
105 	{ XFRM_MSG_GETAE,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
106 	{ XFRM_MSG_REPORT,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
107 	{ XFRM_MSG_MIGRATE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
108 	{ XFRM_MSG_NEWSADINFO,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
109 	{ XFRM_MSG_GETSADINFO,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
110 	{ XFRM_MSG_NEWSPDINFO,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
111 	{ XFRM_MSG_GETSPDINFO,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
112 	{ XFRM_MSG_MAPPING,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
113 };
114 
115 static struct nlmsg_perm nlmsg_audit_perms[] =
116 {
117 	{ AUDIT_GET,		NETLINK_AUDIT_SOCKET__NLMSG_READ     },
118 	{ AUDIT_SET,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
119 	{ AUDIT_LIST,		NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
120 	{ AUDIT_ADD,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
121 	{ AUDIT_DEL,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
122 	{ AUDIT_LIST_RULES,	NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
123 	{ AUDIT_ADD_RULE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
124 	{ AUDIT_DEL_RULE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
125 	{ AUDIT_USER,		NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
126 	{ AUDIT_SIGNAL_INFO,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
127 	{ AUDIT_TRIM,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
128 	{ AUDIT_MAKE_EQUIV,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
129 	{ AUDIT_TTY_GET,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
130 	{ AUDIT_TTY_SET,	NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT	},
131 	{ AUDIT_GET_FEATURE,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
132 	{ AUDIT_SET_FEATURE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
133 };
134 
135 
nlmsg_perm(u16 nlmsg_type,u32 * perm,struct nlmsg_perm * tab,size_t tabsize)136 static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize)
137 {
138 	int i, err = -EINVAL;
139 
140 	for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
141 		if (nlmsg_type == tab[i].nlmsg_type) {
142 			*perm = tab[i].perm;
143 			err = 0;
144 			break;
145 		}
146 
147 	return err;
148 }
149 
selinux_nlmsg_lookup(u16 sclass,u16 nlmsg_type,u32 * perm)150 int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
151 {
152 	int err = 0;
153 
154 	switch (sclass) {
155 	case SECCLASS_NETLINK_ROUTE_SOCKET:
156 		err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
157 				 sizeof(nlmsg_route_perms));
158 		break;
159 
160 	case SECCLASS_NETLINK_TCPDIAG_SOCKET:
161 		err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
162 				 sizeof(nlmsg_tcpdiag_perms));
163 		break;
164 
165 	case SECCLASS_NETLINK_XFRM_SOCKET:
166 		err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
167 				 sizeof(nlmsg_xfrm_perms));
168 		break;
169 
170 	case SECCLASS_NETLINK_AUDIT_SOCKET:
171 		if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
172 		     nlmsg_type <= AUDIT_LAST_USER_MSG) ||
173 		    (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
174 		     nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
175 			*perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
176 		} else {
177 			err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
178 					 sizeof(nlmsg_audit_perms));
179 		}
180 		break;
181 
182 	/* No messaging from userspace, or class unknown/unhandled */
183 	default:
184 		err = -ENOENT;
185 		break;
186 	}
187 
188 	return err;
189 }
190