Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
nlmsgtab.c
Go to the documentation of this file.
1 /*
2  * Netlink message type permission tables, for user generated messages.
3  *
4  * Author: James Morris <[email protected]>
5  *
6  * Copyright (C) 2004 Red Hat, Inc., James Morris <[email protected]>
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 };
71 
72 static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
73 {
74  { TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
75  { DCCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
76 };
77 
78 static struct nlmsg_perm nlmsg_xfrm_perms[] =
79 {
80  { XFRM_MSG_NEWSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
81  { XFRM_MSG_DELSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
82  { XFRM_MSG_GETSA, NETLINK_XFRM_SOCKET__NLMSG_READ },
83  { XFRM_MSG_NEWPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
84  { XFRM_MSG_DELPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
85  { XFRM_MSG_GETPOLICY, NETLINK_XFRM_SOCKET__NLMSG_READ },
86  { XFRM_MSG_ALLOCSPI, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
87  { XFRM_MSG_ACQUIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
88  { XFRM_MSG_EXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
89  { XFRM_MSG_UPDPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
90  { XFRM_MSG_UPDSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
91  { XFRM_MSG_POLEXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
92  { XFRM_MSG_FLUSHSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
93  { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
94  { XFRM_MSG_NEWAE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
95  { XFRM_MSG_GETAE, NETLINK_XFRM_SOCKET__NLMSG_READ },
96 };
97 
98 static struct nlmsg_perm nlmsg_audit_perms[] =
99 {
100  { AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },
101  { AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
102  { AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
103  { AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
104  { AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
105  { AUDIT_LIST_RULES, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
106  { AUDIT_ADD_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
107  { AUDIT_DEL_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
108  { AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_RELAY },
109  { AUDIT_SIGNAL_INFO, NETLINK_AUDIT_SOCKET__NLMSG_READ },
110  { AUDIT_TRIM, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
111  { AUDIT_MAKE_EQUIV, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
112  { AUDIT_TTY_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },
113  { AUDIT_TTY_SET, NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT },
114 };
115 
116 
117 static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize)
118 {
119  int i, err = -EINVAL;
120 
121  for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
122  if (nlmsg_type == tab[i].nlmsg_type) {
123  *perm = tab[i].perm;
124  err = 0;
125  break;
126  }
127 
128  return err;
129 }
130 
131 int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
132 {
133  int err = 0;
134 
135  switch (sclass) {
136  case SECCLASS_NETLINK_ROUTE_SOCKET:
137  err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
138  sizeof(nlmsg_route_perms));
139  break;
140 
141  case SECCLASS_NETLINK_TCPDIAG_SOCKET:
142  err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
143  sizeof(nlmsg_tcpdiag_perms));
144  break;
145 
146  case SECCLASS_NETLINK_XFRM_SOCKET:
147  err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
148  sizeof(nlmsg_xfrm_perms));
149  break;
150 
151  case SECCLASS_NETLINK_AUDIT_SOCKET:
152  if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
153  nlmsg_type <= AUDIT_LAST_USER_MSG) ||
154  (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
155  nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
156  *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
157  } else {
158  err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
159  sizeof(nlmsg_audit_perms));
160  }
161  break;
162 
163  /* No messaging from userspace, or class unknown/unhandled */
164  default:
165  err = -ENOENT;
166  break;
167  }
168 
169  return err;
170 }
Generated on Thu Jan 10 2013 15:03:19 for Linux Kernel by   doxygen 1.8.2