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 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 { RTM_GETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 67 { RTM_SETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 68 }; 69 70 static struct nlmsg_perm nlmsg_firewall_perms[] = 71 { 72 { IPQM_MODE, NETLINK_FIREWALL_SOCKET__NLMSG_WRITE }, 73 { IPQM_VERDICT, NETLINK_FIREWALL_SOCKET__NLMSG_WRITE }, 74 }; 75 76 static struct nlmsg_perm nlmsg_tcpdiag_perms[] = 77 { 78 { TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, 79 { DCCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, 80 }; 81 82 static struct nlmsg_perm nlmsg_xfrm_perms[] = 83 { 84 { XFRM_MSG_NEWSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 85 { XFRM_MSG_DELSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 86 { XFRM_MSG_GETSA, NETLINK_XFRM_SOCKET__NLMSG_READ }, 87 { XFRM_MSG_NEWPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 88 { XFRM_MSG_DELPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 89 { XFRM_MSG_GETPOLICY, NETLINK_XFRM_SOCKET__NLMSG_READ }, 90 { XFRM_MSG_ALLOCSPI, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 91 { XFRM_MSG_UPDPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 92 { XFRM_MSG_UPDSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 93 }; 94 95 static struct nlmsg_perm nlmsg_audit_perms[] = 96 { 97 { AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ }, 98 { AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 99 { AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV }, 100 { AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 101 { AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 102 { AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_RELAY }, 103 { AUDIT_SIGNAL_INFO, NETLINK_AUDIT_SOCKET__NLMSG_READ }, 104 }; 105 106 107 static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize) 108 { 109 int i, err = -EINVAL; 110 111 for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++) 112 if (nlmsg_type == tab[i].nlmsg_type) { 113 *perm = tab[i].perm; 114 err = 0; 115 break; 116 } 117 118 return err; 119 } 120 121 int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm) 122 { 123 int err = 0; 124 125 switch (sclass) { 126 case SECCLASS_NETLINK_ROUTE_SOCKET: 127 err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms, 128 sizeof(nlmsg_route_perms)); 129 break; 130 131 case SECCLASS_NETLINK_FIREWALL_SOCKET: 132 case SECCLASS_NETLINK_IP6FW_SOCKET: 133 err = nlmsg_perm(nlmsg_type, perm, nlmsg_firewall_perms, 134 sizeof(nlmsg_firewall_perms)); 135 break; 136 137 case SECCLASS_NETLINK_TCPDIAG_SOCKET: 138 err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms, 139 sizeof(nlmsg_tcpdiag_perms)); 140 break; 141 142 case SECCLASS_NETLINK_XFRM_SOCKET: 143 err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms, 144 sizeof(nlmsg_xfrm_perms)); 145 break; 146 147 case SECCLASS_NETLINK_AUDIT_SOCKET: 148 if (nlmsg_type >= AUDIT_FIRST_USER_MSG && 149 nlmsg_type <= AUDIT_LAST_USER_MSG) { 150 *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY; 151 } else { 152 err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms, 153 sizeof(nlmsg_audit_perms)); 154 } 155 break; 156 157 /* No messaging from userspace, or class unknown/unhandled */ 158 default: 159 err = -ENOENT; 160 break; 161 } 162 163 return err; 164 } 165