xref: /openbmc/linux/security/selinux/nlmsgtab.c (revision d41ced01f21ddd2c3a01531bb9edf6c41064e9fc)
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/netfilter_ipv4/ip_queue.h>
18 #include <linux/inet_diag.h>
19 #include <linux/xfrm.h>
20 #include <linux/audit.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 };
72 
73 static struct nlmsg_perm nlmsg_firewall_perms[] =
74 {
75 	{ IPQM_MODE,		NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
76 	{ IPQM_VERDICT,		NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
77 };
78 
79 static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
80 {
81 	{ TCPDIAG_GETSOCK,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
82 	{ DCCPDIAG_GETSOCK,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
83 };
84 
85 static struct nlmsg_perm nlmsg_xfrm_perms[] =
86 {
87 	{ XFRM_MSG_NEWSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
88 	{ XFRM_MSG_DELSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
89 	{ XFRM_MSG_GETSA,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
90 	{ XFRM_MSG_NEWPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
91 	{ XFRM_MSG_DELPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
92 	{ XFRM_MSG_GETPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
93 	{ XFRM_MSG_ALLOCSPI,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
94 	{ XFRM_MSG_ACQUIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
95 	{ XFRM_MSG_EXPIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
96 	{ XFRM_MSG_UPDPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
97 	{ XFRM_MSG_UPDSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
98 	{ XFRM_MSG_POLEXPIRE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
99 	{ XFRM_MSG_FLUSHSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
100 	{ XFRM_MSG_FLUSHPOLICY,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
101 	{ XFRM_MSG_NEWAE,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
102 	{ XFRM_MSG_GETAE,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
103 };
104 
105 static struct nlmsg_perm nlmsg_audit_perms[] =
106 {
107 	{ AUDIT_GET,		NETLINK_AUDIT_SOCKET__NLMSG_READ     },
108 	{ AUDIT_SET,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
109 	{ AUDIT_LIST,		NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
110 	{ AUDIT_ADD,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
111 	{ AUDIT_DEL,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
112 	{ AUDIT_LIST_RULES,	NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
113 	{ AUDIT_ADD_RULE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
114 	{ AUDIT_DEL_RULE,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
115 	{ AUDIT_USER,		NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
116 	{ AUDIT_SIGNAL_INFO,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
117 	{ AUDIT_TRIM,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
118 	{ AUDIT_MAKE_EQUIV,	NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
119 	{ AUDIT_TTY_GET,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
120 	{ AUDIT_TTY_SET,	NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT	},
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_FIREWALL_SOCKET:
149 	case SECCLASS_NETLINK_IP6FW_SOCKET:
150 		err = nlmsg_perm(nlmsg_type, perm, nlmsg_firewall_perms,
151 				 sizeof(nlmsg_firewall_perms));
152 		break;
153 
154 	case SECCLASS_NETLINK_TCPDIAG_SOCKET:
155 		err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
156 				 sizeof(nlmsg_tcpdiag_perms));
157 		break;
158 
159 	case SECCLASS_NETLINK_XFRM_SOCKET:
160 		err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
161 				 sizeof(nlmsg_xfrm_perms));
162 		break;
163 
164 	case SECCLASS_NETLINK_AUDIT_SOCKET:
165 		if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
166 		     nlmsg_type <= AUDIT_LAST_USER_MSG) ||
167 		    (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
168 		     nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
169 			*perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
170 		} else {
171 			err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
172 					 sizeof(nlmsg_audit_perms));
173 		}
174 		break;
175 
176 	/* No messaging from userspace, or class unknown/unhandled */
177 	default:
178 		err = -ENOENT;
179 		break;
180 	}
181 
182 	return err;
183 }
184