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 { RTM_NEWNSID, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 77 { RTM_DELNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 78 { RTM_GETNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 79 }; 80 81 static struct nlmsg_perm nlmsg_tcpdiag_perms[] = 82 { 83 { TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, 84 { DCCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, 85 { SOCK_DIAG_BY_FAMILY, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, 86 { SOCK_DESTROY, NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE }, 87 }; 88 89 static struct nlmsg_perm nlmsg_xfrm_perms[] = 90 { 91 { XFRM_MSG_NEWSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 92 { XFRM_MSG_DELSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 93 { XFRM_MSG_GETSA, NETLINK_XFRM_SOCKET__NLMSG_READ }, 94 { XFRM_MSG_NEWPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 95 { XFRM_MSG_DELPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 96 { XFRM_MSG_GETPOLICY, NETLINK_XFRM_SOCKET__NLMSG_READ }, 97 { XFRM_MSG_ALLOCSPI, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 98 { XFRM_MSG_ACQUIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 99 { XFRM_MSG_EXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 100 { XFRM_MSG_UPDPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 101 { XFRM_MSG_UPDSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 102 { XFRM_MSG_POLEXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 103 { XFRM_MSG_FLUSHSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 104 { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 105 { XFRM_MSG_NEWAE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 106 { XFRM_MSG_GETAE, NETLINK_XFRM_SOCKET__NLMSG_READ }, 107 { XFRM_MSG_REPORT, NETLINK_XFRM_SOCKET__NLMSG_READ }, 108 { XFRM_MSG_MIGRATE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 109 { XFRM_MSG_NEWSADINFO, NETLINK_XFRM_SOCKET__NLMSG_READ }, 110 { XFRM_MSG_GETSADINFO, NETLINK_XFRM_SOCKET__NLMSG_READ }, 111 { XFRM_MSG_NEWSPDINFO, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 112 { XFRM_MSG_GETSPDINFO, NETLINK_XFRM_SOCKET__NLMSG_READ }, 113 { XFRM_MSG_MAPPING, NETLINK_XFRM_SOCKET__NLMSG_READ }, 114 }; 115 116 static struct nlmsg_perm nlmsg_audit_perms[] = 117 { 118 { AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ }, 119 { AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 120 { AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV }, 121 { AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 122 { AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 123 { AUDIT_LIST_RULES, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV }, 124 { AUDIT_ADD_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 125 { AUDIT_DEL_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 126 { AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_RELAY }, 127 { AUDIT_SIGNAL_INFO, NETLINK_AUDIT_SOCKET__NLMSG_READ }, 128 { AUDIT_TRIM, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 129 { AUDIT_MAKE_EQUIV, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 130 { AUDIT_TTY_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ }, 131 { AUDIT_TTY_SET, NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT }, 132 { AUDIT_GET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_READ }, 133 { AUDIT_SET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 134 }; 135 136 137 static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize) 138 { 139 int i, err = -EINVAL; 140 141 for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++) 142 if (nlmsg_type == tab[i].nlmsg_type) { 143 *perm = tab[i].perm; 144 err = 0; 145 break; 146 } 147 148 return err; 149 } 150 151 int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm) 152 { 153 int err = 0; 154 155 switch (sclass) { 156 case SECCLASS_NETLINK_ROUTE_SOCKET: 157 /* RTM_MAX always point to RTM_SETxxxx, ie RTM_NEWxxx + 3 */ 158 BUILD_BUG_ON(RTM_MAX != (RTM_NEWNSID + 3)); 159 err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms, 160 sizeof(nlmsg_route_perms)); 161 break; 162 163 case SECCLASS_NETLINK_TCPDIAG_SOCKET: 164 err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms, 165 sizeof(nlmsg_tcpdiag_perms)); 166 break; 167 168 case SECCLASS_NETLINK_XFRM_SOCKET: 169 BUILD_BUG_ON(XFRM_MSG_MAX != XFRM_MSG_MAPPING); 170 err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms, 171 sizeof(nlmsg_xfrm_perms)); 172 break; 173 174 case SECCLASS_NETLINK_AUDIT_SOCKET: 175 if ((nlmsg_type >= AUDIT_FIRST_USER_MSG && 176 nlmsg_type <= AUDIT_LAST_USER_MSG) || 177 (nlmsg_type >= AUDIT_FIRST_USER_MSG2 && 178 nlmsg_type <= AUDIT_LAST_USER_MSG2)) { 179 *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY; 180 } else { 181 err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms, 182 sizeof(nlmsg_audit_perms)); 183 } 184 break; 185 186 /* No messaging from userspace, or class unknown/unhandled */ 187 default: 188 err = -ENOENT; 189 break; 190 } 191 192 return err; 193 } 194