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 } 171