SELinux: define audit permissions for audit tree netlink messages
[linux-3.10.git] / security / selinux / nlmsgtab.c
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/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/rtnetlink.h>
17 #include <linux/if.h>
18 #include <linux/netfilter_ipv4/ip_queue.h>
19 #include <linux/inet_diag.h>
20 #include <linux/xfrm.h>
21 #include <linux/audit.h>
22
23 #include "flask.h"
24 #include "av_permissions.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 };
70
71 static struct nlmsg_perm nlmsg_firewall_perms[] =
72 {
73         { IPQM_MODE,            NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
74         { IPQM_VERDICT,         NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
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 };
120
121
122 static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize)
123 {
124         int i, err = -EINVAL;
125
126         for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
127                 if (nlmsg_type == tab[i].nlmsg_type) {
128                         *perm = tab[i].perm;
129                         err = 0;
130                         break;
131                 }
132
133         return err;
134 }
135
136 int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
137 {
138         int err = 0;
139
140         switch (sclass) {
141         case SECCLASS_NETLINK_ROUTE_SOCKET:
142                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
143                                  sizeof(nlmsg_route_perms));
144                 break;
145
146         case SECCLASS_NETLINK_FIREWALL_SOCKET:
147         case SECCLASS_NETLINK_IP6FW_SOCKET:
148                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_firewall_perms,
149                                  sizeof(nlmsg_firewall_perms));
150                 break;
151
152         case SECCLASS_NETLINK_TCPDIAG_SOCKET:
153                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
154                                  sizeof(nlmsg_tcpdiag_perms));
155                 break;
156
157         case SECCLASS_NETLINK_XFRM_SOCKET:
158                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
159                                  sizeof(nlmsg_xfrm_perms));
160                 break;
161
162         case SECCLASS_NETLINK_AUDIT_SOCKET:
163                 if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
164                      nlmsg_type <= AUDIT_LAST_USER_MSG) ||
165                     (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
166                      nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
167                         *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
168                 } else {
169                         err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
170                                          sizeof(nlmsg_audit_perms));
171                 }
172                 break;
173
174         /* No messaging from userspace, or class unknown/unhandled */
175         default:
176                 err = -ENOENT;
177                 break;
178         }
179
180         return err;
181 }