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 { RTM_NEWLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 30 { RTM_DELLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 31 { RTM_GETLINK, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 32 { RTM_SETLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 33 { RTM_NEWADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 34 { RTM_DELADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 35 { RTM_GETADDR, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 36 { RTM_NEWROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 37 { RTM_DELROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 38 { RTM_GETROUTE, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 39 { RTM_NEWNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 40 { RTM_DELNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 41 { RTM_GETNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 42 { RTM_NEWRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 43 { RTM_DELRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 44 { RTM_GETRULE, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 45 { RTM_NEWQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 46 { RTM_DELQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 47 { RTM_GETQDISC, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 48 { RTM_NEWTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 49 { RTM_DELTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 50 { RTM_GETTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 51 { RTM_NEWTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 52 { RTM_DELTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 53 { RTM_GETTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 54 { RTM_NEWACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 55 { RTM_DELACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 56 { RTM_GETACTION, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 57 { RTM_NEWPREFIX, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 58 { RTM_GETMULTICAST, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 59 { RTM_GETANYCAST, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 60 { RTM_GETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 61 { RTM_SETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 62 { RTM_NEWADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 63 { RTM_DELADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 64 { RTM_GETADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 65 { RTM_GETDCB, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 66 { RTM_SETDCB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 67 { RTM_NEWNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 68 { RTM_DELNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 69 { RTM_GETNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 70 { RTM_NEWMDB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 71 { RTM_DELMDB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 72 { RTM_GETMDB, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 73 { RTM_NEWNSID, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 74 { RTM_DELNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 75 { RTM_GETNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 76 { RTM_NEWSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 77 { RTM_GETSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 78 { RTM_SETSTATS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 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 { RTM_NEWTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 95 { RTM_DELTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, 96 { RTM_GETTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_READ }, 97 }; 98 99 static const struct nlmsg_perm nlmsg_tcpdiag_perms[] = { 100 { TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, 101 { SOCK_DIAG_BY_FAMILY, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, 102 { SOCK_DESTROY, NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE }, 103 }; 104 105 static const struct nlmsg_perm nlmsg_xfrm_perms[] = { 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 { XFRM_MSG_SETDEFAULT, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, 130 { XFRM_MSG_GETDEFAULT, NETLINK_XFRM_SOCKET__NLMSG_READ }, 131 }; 132 133 static const struct nlmsg_perm nlmsg_audit_perms[] = { 134 { AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ }, 135 { AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 136 { AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV }, 137 { AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 138 { AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 139 { AUDIT_LIST_RULES, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV }, 140 { AUDIT_ADD_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 141 { AUDIT_DEL_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 142 { AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_RELAY }, 143 { AUDIT_SIGNAL_INFO, NETLINK_AUDIT_SOCKET__NLMSG_READ }, 144 { AUDIT_TRIM, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 145 { AUDIT_MAKE_EQUIV, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 146 { AUDIT_TTY_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ }, 147 { AUDIT_TTY_SET, NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT }, 148 { AUDIT_GET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_READ }, 149 { AUDIT_SET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, 150 }; 151 152 static int nlmsg_perm(u16 nlmsg_type, u32 *perm, const struct nlmsg_perm *tab, 153 size_t tabsize) 154 { 155 unsigned int i; 156 int err = -EINVAL; 157 158 for (i = 0; i < tabsize / sizeof(struct nlmsg_perm); i++) 159 if (nlmsg_type == tab[i].nlmsg_type) { 160 *perm = tab[i].perm; 161 err = 0; 162 break; 163 } 164 165 return err; 166 } 167 168 int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm) 169 { 170 /* While it is possible to add a similar permission to other netlink 171 * classes, note that the extended permission value is matched against 172 * the nlmsg_type field. Notably, SECCLASS_NETLINK_GENERIC_SOCKET uses 173 * dynamic values for this field, which means that it cannot be added 174 * as-is. 175 */ 176 177 switch (sclass) { 178 case SECCLASS_NETLINK_ROUTE_SOCKET: 179 /* RTM_MAX always points to RTM_SETxxxx, ie RTM_NEWxxx + 3. 180 * If the BUILD_BUG_ON() below fails you must update the 181 * structures at the top of this file with the new mappings 182 * before updating the BUILD_BUG_ON() macro! 183 */ 184 BUILD_BUG_ON(RTM_MAX != (RTM_NEWTUNNEL + 3)); 185 186 if (selinux_policycap_netlink_xperm()) { 187 *perm = NETLINK_ROUTE_SOCKET__NLMSG; 188 return 0; 189 } 190 return nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms, 191 sizeof(nlmsg_route_perms)); 192 break; 193 case SECCLASS_NETLINK_TCPDIAG_SOCKET: 194 if (selinux_policycap_netlink_xperm()) { 195 *perm = NETLINK_TCPDIAG_SOCKET__NLMSG; 196 return 0; 197 } 198 return nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms, 199 sizeof(nlmsg_tcpdiag_perms)); 200 break; 201 case SECCLASS_NETLINK_XFRM_SOCKET: 202 /* If the BUILD_BUG_ON() below fails you must update the 203 * structures at the top of this file with the new mappings 204 * before updating the BUILD_BUG_ON() macro! 205 */ 206 BUILD_BUG_ON(XFRM_MSG_MAX != XFRM_MSG_GETDEFAULT); 207 208 if (selinux_policycap_netlink_xperm()) { 209 *perm = NETLINK_XFRM_SOCKET__NLMSG; 210 return 0; 211 } 212 return nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms, 213 sizeof(nlmsg_xfrm_perms)); 214 break; 215 case SECCLASS_NETLINK_AUDIT_SOCKET: 216 if (selinux_policycap_netlink_xperm()) { 217 *perm = NETLINK_AUDIT_SOCKET__NLMSG; 218 return 0; 219 } else if ((nlmsg_type >= AUDIT_FIRST_USER_MSG && 220 nlmsg_type <= AUDIT_LAST_USER_MSG) || 221 (nlmsg_type >= AUDIT_FIRST_USER_MSG2 && 222 nlmsg_type <= AUDIT_LAST_USER_MSG2)) { 223 *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY; 224 return 0; 225 } 226 return nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms, 227 sizeof(nlmsg_audit_perms)); 228 break; 229 } 230 231 /* No messaging from userspace, or class unknown/unhandled */ 232 return -ENOENT; 233 } 234