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/tcp_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 {
  28         u16     nlmsg_type;
  29         u32     perm;
  30 };
  31
  32 static struct nlmsg_perm nlmsg_route_perms[] =
  33 {
  34         { RTM_NEWLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  35         { RTM_DELLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  36         { RTM_GETLINK,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  37         { RTM_SETLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  38         { RTM_NEWADDR,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  39         { RTM_DELADDR,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  40         { RTM_GETADDR,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  41         { RTM_NEWROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  42         { RTM_DELROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  43         { RTM_GETROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  44         { RTM_NEWNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  45         { RTM_DELNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  46         { RTM_GETNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  47         { RTM_NEWRULE,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  48         { RTM_DELRULE,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  49         { RTM_GETRULE,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  50         { RTM_NEWQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  51         { RTM_DELQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  52         { RTM_GETQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  53         { RTM_NEWTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  54         { RTM_DELTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  55         { RTM_GETTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  56         { RTM_NEWTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  57         { RTM_DELTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  58         { RTM_GETTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  59         { RTM_NEWACTION,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  60         { RTM_DELACTION,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  61         { RTM_GETACTION,        NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  62         { RTM_NEWPREFIX,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  63         { RTM_GETPREFIX,        NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  64         { RTM_GETMULTICAST,     NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  65         { RTM_GETANYCAST,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  66 };
  67
  68 static struct nlmsg_perm nlmsg_firewall_perms[] =
  69 {
  70         { IPQM_MODE,            NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
  71         { IPQM_VERDICT,         NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
  72 };
  73
  74 static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
  75 {
  76         { TCPDIAG_GETSOCK,      NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
  77 };
  78
  79 static struct nlmsg_perm nlmsg_xfrm_perms[] =
  80 {
  81         { XFRM_MSG_NEWSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  82         { XFRM_MSG_DELSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  83         { XFRM_MSG_GETSA,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
  84         { XFRM_MSG_NEWPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  85         { XFRM_MSG_DELPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  86         { XFRM_MSG_GETPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_READ  },
  87         { XFRM_MSG_ALLOCSPI,    NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  88         { XFRM_MSG_UPDPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  89         { XFRM_MSG_UPDSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  90 };
  91
  92 static struct nlmsg_perm nlmsg_audit_perms[] =
  93 {
  94         { AUDIT_GET,            NETLINK_AUDIT_SOCKET__NLMSG_READ  },
  95         { AUDIT_SET,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
  96         { AUDIT_LIST,           NETLINK_AUDIT_SOCKET__NLMSG_READ  },
  97         { AUDIT_ADD,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
  98         { AUDIT_DEL,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
  99         { AUDIT_USER,           NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
 100         { AUDIT_LOGIN,          NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
 101 };
 102
 103
 104 static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize)
 105 {
 106         int i, err = -EINVAL;
 107
 108         for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
 109                 if (nlmsg_type == tab[i].nlmsg_type) {
 110                         *perm = tab[i].perm;
 111                         err = 0;
 112                         break;
 113                 }
 114
 115         return err;
 116 }
 117
 118 int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
 119 {
 120         int err = 0;
 121
 122         switch (sclass) {
 123         case SECCLASS_NETLINK_ROUTE_SOCKET:
 124                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
 125                                  sizeof(nlmsg_route_perms));
 126                 break;
 127
 128         case SECCLASS_NETLINK_FIREWALL_SOCKET:
 129         case NETLINK_IP6_FW:
 130                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_firewall_perms,
 131                                  sizeof(nlmsg_firewall_perms));
 132                 break;
 133
 134         case SECCLASS_NETLINK_TCPDIAG_SOCKET:
 135                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
 136                                  sizeof(nlmsg_tcpdiag_perms));
 137                 break;
 138
 139         case SECCLASS_NETLINK_XFRM_SOCKET:
 140                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
 141                                  sizeof(nlmsg_xfrm_perms));
 142                 break;
 143
 144         case SECCLASS_NETLINK_AUDIT_SOCKET:
 145                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
 146                                  sizeof(nlmsg_audit_perms));
 147                 break;
 148
 149         /* No messaging from userspace, or class unknown/unhandled */
 150         default:
 151                 err = -ENOENT;
 152                 break;
 153         }
 154
 155         return err;
 156 }