security/selinux/nlmsgtab.c

   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
  23 struct nlmsg_perm {
  24         u16     nlmsg_type;
  25         u32     perm;
  26 };
  27
  28 static 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
  96 static 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
 104 static 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
 131 static 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
 152 static 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
 166 int 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 }