linux/security/selinux/nlmsgtab.c
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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/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
  26struct nlmsg_perm {
  27        u16     nlmsg_type;
  28        u32     perm;
  29};
  30
  31static 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};
  67
  68static 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
  74static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
  75{
  76        { TCPDIAG_GETSOCK,      NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
  77        { DCCPDIAG_GETSOCK,     NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
  78};
  79
  80static struct nlmsg_perm nlmsg_xfrm_perms[] =
  81{
  82        { XFRM_MSG_NEWSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  83        { XFRM_MSG_DELSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  84        { XFRM_MSG_GETSA,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
  85        { XFRM_MSG_NEWPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  86        { XFRM_MSG_DELPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  87        { XFRM_MSG_GETPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_READ  },
  88        { XFRM_MSG_ALLOCSPI,    NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  89        { XFRM_MSG_ACQUIRE,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  90        { XFRM_MSG_EXPIRE,      NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  91        { XFRM_MSG_UPDPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  92        { XFRM_MSG_UPDSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  93        { XFRM_MSG_POLEXPIRE,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  94        { XFRM_MSG_FLUSHSA,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  95        { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  96        { XFRM_MSG_NEWAE,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  97        { XFRM_MSG_GETAE,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
  98};
  99
 100static struct nlmsg_perm nlmsg_audit_perms[] =
 101{
 102        { AUDIT_GET,            NETLINK_AUDIT_SOCKET__NLMSG_READ     },
 103        { AUDIT_SET,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 104        { AUDIT_LIST,           NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
 105        { AUDIT_ADD,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 106        { AUDIT_DEL,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 107        { AUDIT_LIST_RULES,     NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
 108        { AUDIT_ADD_RULE,       NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 109        { AUDIT_DEL_RULE,       NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 110        { AUDIT_USER,           NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
 111        { AUDIT_SIGNAL_INFO,    NETLINK_AUDIT_SOCKET__NLMSG_READ     },
 112        { AUDIT_TTY_GET,        NETLINK_AUDIT_SOCKET__NLMSG_READ     },
 113        { AUDIT_TTY_SET,        NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 114};
 115
 116
 117static 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
 131int 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_FIREWALL_SOCKET:
 142        case SECCLASS_NETLINK_IP6FW_SOCKET:
 143                err = nlmsg_perm(nlmsg_type, perm, nlmsg_firewall_perms,
 144                                 sizeof(nlmsg_firewall_perms));
 145                break;
 146
 147        case SECCLASS_NETLINK_TCPDIAG_SOCKET:
 148                err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
 149                                 sizeof(nlmsg_tcpdiag_perms));
 150                break;
 151
 152        case SECCLASS_NETLINK_XFRM_SOCKET:
 153                err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
 154                                 sizeof(nlmsg_xfrm_perms));
 155                break;
 156
 157        case SECCLASS_NETLINK_AUDIT_SOCKET:
 158                if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
 159                     nlmsg_type <= AUDIT_LAST_USER_MSG) ||
 160                    (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
 161                     nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
 162                        *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
 163                } else {
 164                        err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
 165                                         sizeof(nlmsg_audit_perms));
 166                }
 167                break;
 168
 169        /* No messaging from userspace, or class unknown/unhandled */
 170        default:
 171                err = -ENOENT;
 172                break;
 173        }
 174
 175        return err;
 176}
 177