// SPDX-License-Identifier: GPL-2.0-only/* * Netlink message type permission tables, for user generated messages. * * Author: James Morris <jmorris@redhat.com> * * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> */#include <linux/types.h>#include <linux/kernel.h>#include <linux/netlink.h>#include <linux/rtnetlink.h>#include <linux/if.h>#include <linux/inet_diag.h>#include <linux/xfrm.h>#include <linux/audit.h>#include <linux/sock_diag.h> #include "flask.h"#include "av_permissions.h"#include "security.h" struct nlmsg_perm {	u16 nlmsg_type;	u32 perm;}; static const struct nlmsg_perm nlmsg_route_perms[] = {	{ RTM_NEWLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETLINK, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_SETLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_NEWADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETADDR, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETROUTE, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETRULE, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETQDISC, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETACTION, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWPREFIX, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETMULTICAST, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_GETANYCAST, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_GETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_SETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_NEWADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_GETDCB, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_SETDCB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_NEWNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWMDB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELMDB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETMDB, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWNSID, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_GETNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_GETSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_SETSTATS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_NEWCACHEREPORT, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWCHAIN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELCHAIN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETCHAIN, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWNEXTHOP, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELNEXTHOP, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETNEXTHOP, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWLINKPROP, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELLINKPROP, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_NEWVLAN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELVLAN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETVLAN, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_READ },	{ RTM_NEWTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_DELTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },	{ RTM_GETTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_READ },}; static const struct nlmsg_perm nlmsg_tcpdiag_perms[] = {	{ TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },	{ SOCK_DIAG_BY_FAMILY, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },	{ SOCK_DESTROY, NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE },}; static const struct nlmsg_perm nlmsg_xfrm_perms[] = {	{ XFRM_MSG_NEWSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_DELSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_GETSA, NETLINK_XFRM_SOCKET__NLMSG_READ },	{ XFRM_MSG_NEWPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_DELPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_GETPOLICY, NETLINK_XFRM_SOCKET__NLMSG_READ },	{ XFRM_MSG_ALLOCSPI, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_ACQUIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_EXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_UPDPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_UPDSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_POLEXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_FLUSHSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_NEWAE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_GETAE, NETLINK_XFRM_SOCKET__NLMSG_READ },	{ XFRM_MSG_REPORT, NETLINK_XFRM_SOCKET__NLMSG_READ },	{ XFRM_MSG_MIGRATE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_NEWSADINFO, NETLINK_XFRM_SOCKET__NLMSG_READ },	{ XFRM_MSG_GETSADINFO, NETLINK_XFRM_SOCKET__NLMSG_READ },	{ XFRM_MSG_NEWSPDINFO, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_GETSPDINFO, NETLINK_XFRM_SOCKET__NLMSG_READ },	{ XFRM_MSG_MAPPING, NETLINK_XFRM_SOCKET__NLMSG_READ },	{ XFRM_MSG_SETDEFAULT, NETLINK_XFRM_SOCKET__NLMSG_WRITE },	{ XFRM_MSG_GETDEFAULT, NETLINK_XFRM_SOCKET__NLMSG_READ },	{ XFRM_MSG_MIGRATE_STATE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },}; static const struct nlmsg_perm nlmsg_audit_perms[] = {	{ AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },	{ AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },	{ AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },	{ AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },	{ AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },	{ AUDIT_LIST_RULES, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },	{ AUDIT_ADD_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },	{ AUDIT_DEL_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },	{ AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_RELAY },	{ AUDIT_SIGNAL_INFO, NETLINK_AUDIT_SOCKET__NLMSG_READ },	{ AUDIT_TRIM, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },	{ AUDIT_MAKE_EQUIV, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },	{ AUDIT_TTY_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },	{ AUDIT_TTY_SET, NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT },	{ AUDIT_GET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_READ },	{ AUDIT_SET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },}; static int nlmsg_perm(u16 nlmsg_type, u32 *perm, const struct nlmsg_perm *tab,		      size_t tabsize){	unsigned int i;	int err = -EINVAL; 	for (i = 0; i < tabsize / sizeof(struct nlmsg_perm); i++)		if (nlmsg_type == tab[i].nlmsg_type) {			*perm = tab[i].perm;			err = 0;			break;		} 	return err;} int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm){	/* While it is possible to add a similar permission to other netlink	 * classes, note that the extended permission value is matched against	 * the nlmsg_type field. Notably, SECCLASS_NETLINK_GENERIC_SOCKET uses	 * dynamic values for this field, which means that it cannot be added	 * as-is.	 */ 	switch (sclass) {	case SECCLASS_NETLINK_ROUTE_SOCKET:		/* RTM_MAX always points to RTM_SETxxxx, ie RTM_NEWxxx + 3.		 * If the BUILD_BUG_ON() below fails you must update the		 * structures at the top of this file with the new mappings		 * before updating the BUILD_BUG_ON() macro!		 */		BUILD_BUG_ON(RTM_MAX != (RTM_NEWTUNNEL + 3)); 		if (selinux_policycap_netlink_xperm()) {			*perm = NETLINK_ROUTE_SOCKET__NLMSG;			return 0;		}		return nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,				  sizeof(nlmsg_route_perms));		break;	case SECCLASS_NETLINK_TCPDIAG_SOCKET:		if (selinux_policycap_netlink_xperm()) {			*perm = NETLINK_TCPDIAG_SOCKET__NLMSG;			return 0;		}		return nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,				  sizeof(nlmsg_tcpdiag_perms));		break;	case SECCLASS_NETLINK_XFRM_SOCKET:		/* If the BUILD_BUG_ON() below fails you must update the		 * structures at the top of this file with the new mappings		 * before updating the BUILD_BUG_ON() macro!		 */		BUILD_BUG_ON(XFRM_MSG_MAX != XFRM_MSG_MIGRATE_STATE); 		if (selinux_policycap_netlink_xperm()) {			*perm = NETLINK_XFRM_SOCKET__NLMSG;			return 0;		}		return nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,				  sizeof(nlmsg_xfrm_perms));		break;	case SECCLASS_NETLINK_AUDIT_SOCKET:		if (selinux_policycap_netlink_xperm()) {			*perm = NETLINK_AUDIT_SOCKET__NLMSG;			return 0;		} else if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&			    nlmsg_type <= AUDIT_LAST_USER_MSG) ||			   (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&			    nlmsg_type <= AUDIT_LAST_USER_MSG2)) {			*perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;			return 0;		}		return nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,				  sizeof(nlmsg_audit_perms));		break;	} 	/* No messaging from userspace, or class unknown/unhandled */	return -ENOENT;}