linux/security/selinux/nlmsgtab.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Netlink message type permission tables, for user generated messages.
   4 *
   5 * Author: James Morris <jmorris@redhat.com>
   6 *
   7 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
   8 */
   9#include <linux/types.h>
  10#include <linux/kernel.h>
  11#include <linux/netlink.h>
  12#include <linux/rtnetlink.h>
  13#include <linux/if.h>
  14#include <linux/inet_diag.h>
  15#include <linux/xfrm.h>
  16#include <linux/audit.h>
  17#include <linux/sock_diag.h>
  18
  19#include "flask.h"
  20#include "av_permissions.h"
  21#include "security.h"
  22
  23struct nlmsg_perm {
  24        u16     nlmsg_type;
  25        u32     perm;
  26};
  27
  28static const struct nlmsg_perm nlmsg_route_perms[] =
  29{
  30        { RTM_NEWLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  31        { RTM_DELLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  32        { RTM_GETLINK,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  33        { RTM_SETLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  34        { RTM_NEWADDR,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  35        { RTM_DELADDR,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  36        { RTM_GETADDR,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  37        { RTM_NEWROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  38        { RTM_DELROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  39        { RTM_GETROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  40        { RTM_NEWNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  41        { RTM_DELNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  42        { RTM_GETNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  43        { RTM_NEWRULE,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  44        { RTM_DELRULE,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  45        { RTM_GETRULE,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  46        { RTM_NEWQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  47        { RTM_DELQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  48        { RTM_GETQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  49        { RTM_NEWTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  50        { RTM_DELTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  51        { RTM_GETTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  52        { RTM_NEWTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  53        { RTM_DELTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  54        { RTM_GETTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  55        { RTM_NEWACTION,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  56        { RTM_DELACTION,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  57        { RTM_GETACTION,        NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  58        { RTM_NEWPREFIX,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  59        { RTM_GETMULTICAST,     NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  60        { RTM_GETANYCAST,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  61        { RTM_GETNEIGHTBL,      NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  62        { RTM_SETNEIGHTBL,      NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  63        { RTM_NEWADDRLABEL,     NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  64        { RTM_DELADDRLABEL,     NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  65        { RTM_GETADDRLABEL,     NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  66        { RTM_GETDCB,           NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  67        { RTM_SETDCB,           NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  68        { RTM_NEWNETCONF,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  69        { RTM_DELNETCONF,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  70        { RTM_GETNETCONF,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  71        { RTM_NEWMDB,           NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  72        { RTM_DELMDB,           NETLINK_ROUTE_SOCKET__NLMSG_WRITE  },
  73        { RTM_GETMDB,           NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  74        { RTM_NEWNSID,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  75        { RTM_DELNSID,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  76        { RTM_GETNSID,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  77        { RTM_NEWSTATS,         NETLINK_ROUTE_SOCKET__NLMSG_READ },
  78        { RTM_GETSTATS,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  79        { RTM_NEWCACHEREPORT,   NETLINK_ROUTE_SOCKET__NLMSG_READ },
  80        { RTM_NEWCHAIN,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  81        { RTM_DELCHAIN,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  82        { RTM_GETCHAIN,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  83        { RTM_NEWNEXTHOP,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  84        { RTM_DELNEXTHOP,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  85        { RTM_GETNEXTHOP,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  86        { RTM_NEWLINKPROP,      NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  87        { RTM_DELLINKPROP,      NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  88        { RTM_NEWVLAN,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  89        { RTM_DELVLAN,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  90        { RTM_GETVLAN,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  91        { RTM_NEWNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  92        { RTM_DELNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  93        { RTM_GETNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  94};
  95
  96static const struct nlmsg_perm nlmsg_tcpdiag_perms[] =
  97{
  98        { TCPDIAG_GETSOCK,      NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
  99        { DCCPDIAG_GETSOCK,     NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
 100        { SOCK_DIAG_BY_FAMILY,  NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
 101        { SOCK_DESTROY,         NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE },
 102};
 103
 104static const struct nlmsg_perm nlmsg_xfrm_perms[] =
 105{
 106        { XFRM_MSG_NEWSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 107        { XFRM_MSG_DELSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 108        { XFRM_MSG_GETSA,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
 109        { XFRM_MSG_NEWPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 110        { XFRM_MSG_DELPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 111        { XFRM_MSG_GETPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_READ  },
 112        { XFRM_MSG_ALLOCSPI,    NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 113        { XFRM_MSG_ACQUIRE,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 114        { XFRM_MSG_EXPIRE,      NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 115        { XFRM_MSG_UPDPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 116        { XFRM_MSG_UPDSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 117        { XFRM_MSG_POLEXPIRE,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 118        { XFRM_MSG_FLUSHSA,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 119        { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 120        { XFRM_MSG_NEWAE,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 121        { XFRM_MSG_GETAE,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
 122        { XFRM_MSG_REPORT,      NETLINK_XFRM_SOCKET__NLMSG_READ  },
 123        { XFRM_MSG_MIGRATE,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 124        { XFRM_MSG_NEWSADINFO,  NETLINK_XFRM_SOCKET__NLMSG_READ  },
 125        { XFRM_MSG_GETSADINFO,  NETLINK_XFRM_SOCKET__NLMSG_READ  },
 126        { XFRM_MSG_NEWSPDINFO,  NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 127        { XFRM_MSG_GETSPDINFO,  NETLINK_XFRM_SOCKET__NLMSG_READ  },
 128        { XFRM_MSG_MAPPING,     NETLINK_XFRM_SOCKET__NLMSG_READ  },
 129};
 130
 131static const struct nlmsg_perm nlmsg_audit_perms[] =
 132{
 133        { AUDIT_GET,            NETLINK_AUDIT_SOCKET__NLMSG_READ     },
 134        { AUDIT_SET,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 135        { AUDIT_LIST,           NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
 136        { AUDIT_ADD,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 137        { AUDIT_DEL,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 138        { AUDIT_LIST_RULES,     NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
 139        { AUDIT_ADD_RULE,       NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 140        { AUDIT_DEL_RULE,       NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 141        { AUDIT_USER,           NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
 142        { AUDIT_SIGNAL_INFO,    NETLINK_AUDIT_SOCKET__NLMSG_READ     },
 143        { AUDIT_TRIM,           NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 144        { AUDIT_MAKE_EQUIV,     NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 145        { AUDIT_TTY_GET,        NETLINK_AUDIT_SOCKET__NLMSG_READ     },
 146        { AUDIT_TTY_SET,        NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT   },
 147        { AUDIT_GET_FEATURE,    NETLINK_AUDIT_SOCKET__NLMSG_READ     },
 148        { AUDIT_SET_FEATURE,    NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 149};
 150
 151
 152static int nlmsg_perm(u16 nlmsg_type, u32 *perm, const struct nlmsg_perm *tab, size_t tabsize)
 153{
 154        int i, err = -EINVAL;
 155
 156        for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
 157                if (nlmsg_type == tab[i].nlmsg_type) {
 158                        *perm = tab[i].perm;
 159                        err = 0;
 160                        break;
 161                }
 162
 163        return err;
 164}
 165
 166int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
 167{
 168        int err = 0;
 169
 170        switch (sclass) {
 171        case SECCLASS_NETLINK_ROUTE_SOCKET:
 172                /* RTM_MAX always points to RTM_SETxxxx, ie RTM_NEWxxx + 3.
 173                 * If the BUILD_BUG_ON() below fails you must update the
 174                 * structures at the top of this file with the new mappings
 175                 * before updating the BUILD_BUG_ON() macro!
 176                 */
 177                BUILD_BUG_ON(RTM_MAX != (RTM_NEWNEXTHOPBUCKET + 3));
 178                err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
 179                                 sizeof(nlmsg_route_perms));
 180                break;
 181
 182        case SECCLASS_NETLINK_TCPDIAG_SOCKET:
 183                err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
 184                                 sizeof(nlmsg_tcpdiag_perms));
 185                break;
 186
 187        case SECCLASS_NETLINK_XFRM_SOCKET:
 188                /* If the BUILD_BUG_ON() below fails you must update the
 189                 * structures at the top of this file with the new mappings
 190                 * before updating the BUILD_BUG_ON() macro!
 191                 */
 192                BUILD_BUG_ON(XFRM_MSG_MAX != XFRM_MSG_MAPPING);
 193                err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
 194                                 sizeof(nlmsg_xfrm_perms));
 195                break;
 196
 197        case SECCLASS_NETLINK_AUDIT_SOCKET:
 198                if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
 199                     nlmsg_type <= AUDIT_LAST_USER_MSG) ||
 200                    (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
 201                     nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
 202                        *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
 203                } else {
 204                        err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
 205                                         sizeof(nlmsg_audit_perms));
 206                }
 207                break;
 208
 209        /* No messaging from userspace, or class unknown/unhandled */
 210        default:
 211                err = -ENOENT;
 212                break;
 213        }
 214
 215        return err;
 216}
 217