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 #include <linux/sock_diag.h> 21 22 #include "flask.h" 23 #include "av_permissions.h" 24 #include "security.h" 25 26 struct nlmsg_perm { 27 u16 nlmsg_type; 28 u32 perm; 29 }; 30 31 static 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 { RTM_NEWADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 67 { RTM_DELADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 68 { RTM_GETADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 69 { RTM_GETDCB, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 70 { RTM_SETDCB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 71 { RTM_NEWNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 72 { RTM_GETNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 73 { RTM_NEWMDB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 74 { RTM_DELMDB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 75 { RTM_GETMDB, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 76 }; 77 78 static struct nlmsg_perm nlmsg_tcpdiag_perms[] = 79 { 80 { TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, 81 { DCCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, 82 { SOCK_DIAG_BY_FAMILY, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, 83 }; 84 85 static struct nlmsg_perm nlmsg_xfrm_perms[] = 86 { 87 { XFRM_MSG_NEWSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 88 { XFRM_MSG_DELSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 89 { XFRM_MSG_GETSA, NETLINK_XFRM_SOCKET__NLMSG_READ }, 90 { XFRM_MSG_NEWPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 91 { XFRM_MSG_DELPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 92 { XFRM_MSG_GETPOLICY, NETLINK_XFRM_SOCKET__NLMSG_READ }, 93 { XFRM_MSG_ALLOCSPI, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 94 { XFRM_MSG_ACQUIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 95 { XFRM_MSG_EXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 96 { XFRM_MSG_UPDPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 97 { XFRM_MSG_UPDSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 98 { XFRM_MSG_POLEXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 99 { XFRM_MSG_FLUSHSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 100 { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 101 { XFRM_MSG_NEWAE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 102 { XFRM_MSG_GETAE, NETLINK_XFRM_SOCKET__NLMSG_READ }, 103 }; 104 105 static struct nlmsg_perm nlmsg_audit_perms[] = 106 { 107 { AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ }, 108 { AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 109 { AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV }, 110 { AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 111 { AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 112 { AUDIT_LIST_RULES, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV }, 113 { AUDIT_ADD_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 114 { AUDIT_DEL_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 115 { AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_RELAY }, 116 { AUDIT_SIGNAL_INFO, NETLINK_AUDIT_SOCKET__NLMSG_READ }, 117 { AUDIT_TRIM, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 118 { AUDIT_MAKE_EQUIV, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 119 { AUDIT_TTY_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ }, 120 { AUDIT_TTY_SET, NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT }, 121 { AUDIT_GET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_READ }, 122 { AUDIT_SET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 123 }; 124 125 126 static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize) 127 { 128 int i, err = -EINVAL; 129 130 for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++) 131 if (nlmsg_type == tab[i].nlmsg_type) { 132 *perm = tab[i].perm; 133 err = 0; 134 break; 135 } 136 137 return err; 138 } 139 140 int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm) 141 { 142 int err = 0; 143 144 switch (sclass) { 145 case SECCLASS_NETLINK_ROUTE_SOCKET: 146 err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms, 147 sizeof(nlmsg_route_perms)); 148 break; 149 150 case SECCLASS_NETLINK_TCPDIAG_SOCKET: 151 err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms, 152 sizeof(nlmsg_tcpdiag_perms)); 153 break; 154 155 case SECCLASS_NETLINK_XFRM_SOCKET: 156 err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms, 157 sizeof(nlmsg_xfrm_perms)); 158 break; 159 160 case SECCLASS_NETLINK_AUDIT_SOCKET: 161 if ((nlmsg_type >= AUDIT_FIRST_USER_MSG && 162 nlmsg_type <= AUDIT_LAST_USER_MSG) || 163 (nlmsg_type >= AUDIT_FIRST_USER_MSG2 && 164 nlmsg_type <= AUDIT_LAST_USER_MSG2)) { 165 *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY; 166 } else { 167 err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms, 168 sizeof(nlmsg_audit_perms)); 169 } 170 break; 171 172 /* No messaging from userspace, or class unknown/unhandled */ 173 default: 174 err = -ENOENT; 175 break; 176 } 177 178 return err; 179 } 180