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/netlink.h>
  15 #include <linux/rtnetlink.h>
  16 #include <linux/if.h>
  17 #include <linux/inet_diag.h>
  18 #include <linux/xfrm.h>
  19 #include <linux/audit.h>
  20
  21 #include "flask.h"
  22 #include "av_permissions.h"
  23 #include "security.h"
  24
  25 struct nlmsg_perm {
  26         u16     nlmsg_type;
  27         u32     perm;
  28 };
  29
  30 static struct nlmsg_perm nlmsg_route_perms[] =
  31 {
  32         { RTM_NEWLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  33         { RTM_DELLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  34         { RTM_GETLINK,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  35         { RTM_SETLINK,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  36         { RTM_NEWADDR,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  37         { RTM_DELADDR,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  38         { RTM_GETADDR,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  39         { RTM_NEWROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  40         { RTM_DELROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  41         { RTM_GETROUTE,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  42         { RTM_NEWNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  43         { RTM_DELNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  44         { RTM_GETNEIGH,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  45         { RTM_NEWRULE,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  46         { RTM_DELRULE,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  47         { RTM_GETRULE,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  48         { RTM_NEWQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  49         { RTM_DELQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  50         { RTM_GETQDISC,         NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  51         { RTM_NEWTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  52         { RTM_DELTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  53         { RTM_GETTCLASS,        NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  54         { RTM_NEWTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  55         { RTM_DELTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  56         { RTM_GETTFILTER,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  57         { RTM_NEWACTION,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  58         { RTM_DELACTION,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  59         { RTM_GETACTION,        NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  60         { RTM_NEWPREFIX,        NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  61         { RTM_GETMULTICAST,     NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  62         { RTM_GETANYCAST,       NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  63         { RTM_GETNEIGHTBL,      NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  64         { RTM_SETNEIGHTBL,      NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  65         { RTM_NEWADDRLABEL,     NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  66         { RTM_DELADDRLABEL,     NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  67         { RTM_GETADDRLABEL,     NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  68         { RTM_GETDCB,           NETLINK_ROUTE_SOCKET__NLMSG_READ  },
  69         { RTM_SETDCB,           NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  70 };
  71
  72 static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
  73 {
  74         { TCPDIAG_GETSOCK,      NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
  75         { DCCPDIAG_GETSOCK,     NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
  76 };
  77
  78 static struct nlmsg_perm nlmsg_xfrm_perms[] =
  79 {
  80         { XFRM_MSG_NEWSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  81         { XFRM_MSG_DELSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  82         { XFRM_MSG_GETSA,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
  83         { XFRM_MSG_NEWPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  84         { XFRM_MSG_DELPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  85         { XFRM_MSG_GETPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_READ  },
  86         { XFRM_MSG_ALLOCSPI,    NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  87         { XFRM_MSG_ACQUIRE,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  88         { XFRM_MSG_EXPIRE,      NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  89         { XFRM_MSG_UPDPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  90         { XFRM_MSG_UPDSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  91         { XFRM_MSG_POLEXPIRE,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  92         { XFRM_MSG_FLUSHSA,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  93         { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  94         { XFRM_MSG_NEWAE,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  95         { XFRM_MSG_GETAE,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
  96 };
  97
  98 static struct nlmsg_perm nlmsg_audit_perms[] =
  99 {
 100         { AUDIT_GET,            NETLINK_AUDIT_SOCKET__NLMSG_READ     },
 101         { AUDIT_SET,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 102         { AUDIT_LIST,           NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
 103         { AUDIT_ADD,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 104         { AUDIT_DEL,            NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 105         { AUDIT_LIST_RULES,     NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
 106         { AUDIT_ADD_RULE,       NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 107         { AUDIT_DEL_RULE,       NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 108         { AUDIT_USER,           NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
 109         { AUDIT_SIGNAL_INFO,    NETLINK_AUDIT_SOCKET__NLMSG_READ     },
 110         { AUDIT_TRIM,           NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 111         { AUDIT_MAKE_EQUIV,     NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 112         { AUDIT_TTY_GET,        NETLINK_AUDIT_SOCKET__NLMSG_READ     },
 113         { AUDIT_TTY_SET,        NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT   },
 114 };
 115
 116
 117 static 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
 131 int 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_TCPDIAG_SOCKET:
 142                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
 143                                  sizeof(nlmsg_tcpdiag_perms));
 144                 break;
 145
 146         case SECCLASS_NETLINK_XFRM_SOCKET:
 147                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
 148                                  sizeof(nlmsg_xfrm_perms));
 149                 break;
 150
 151         case SECCLASS_NETLINK_AUDIT_SOCKET:
 152                 if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
 153                      nlmsg_type <= AUDIT_LAST_USER_MSG) ||
 154                     (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
 155                      nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
 156                         *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
 157                 } else {
 158                         err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
 159                                          sizeof(nlmsg_audit_perms));
 160                 }
 161                 break;
 162
 163         /* No messaging from userspace, or class unknown/unhandled */
 164         default:
 165                 err = -ENOENT;
 166                 break;
 167         }
 168
 169         return err;
 170 }