220 lines
7.9 KiB
C
220 lines
7.9 KiB
C
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/*
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* Netlink message type permission tables, for user generated messages.
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*
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* Author: James Morris <jmorris@redhat.com>
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*
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* Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2,
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* as published by the Free Software Foundation.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/if.h>
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#include <linux/inet_diag.h>
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#include <linux/xfrm.h>
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#include <linux/audit.h>
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#include <linux/sock_diag.h>
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#include "flask.h"
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#include "av_permissions.h"
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#include "security.h"
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struct nlmsg_perm {
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u16 nlmsg_type;
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u32 perm;
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};
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static struct nlmsg_perm nlmsg_route_perms[] =
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{
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{ RTM_NEWLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_DELLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_GETLINK, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_SETLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_NEWADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_DELADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_GETADDR, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_NEWROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_DELROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_GETROUTE, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_NEWNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_DELNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_GETNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_NEWRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_DELRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_GETRULE, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_NEWQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_DELQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_GETQDISC, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_NEWTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_DELTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_GETTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_NEWTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_DELTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_GETTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_NEWACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_DELACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_GETACTION, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_NEWPREFIX, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_GETMULTICAST, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_GETANYCAST, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_GETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_SETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_NEWADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_DELADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_GETADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_GETDCB, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_SETDCB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_NEWNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_GETNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_NEWMDB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_DELMDB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_GETMDB, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_NEWNSID, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
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{ RTM_DELNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_GETNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_NEWSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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{ RTM_GETSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ },
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};
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static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
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{
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{ TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
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{ DCCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
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{ SOCK_DIAG_BY_FAMILY, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
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{ SOCK_DESTROY, NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE },
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};
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static struct nlmsg_perm nlmsg_xfrm_perms[] =
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{
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{ XFRM_MSG_NEWSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_DELSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_GETSA, NETLINK_XFRM_SOCKET__NLMSG_READ },
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{ XFRM_MSG_NEWPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_DELPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_GETPOLICY, NETLINK_XFRM_SOCKET__NLMSG_READ },
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{ XFRM_MSG_ALLOCSPI, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_ACQUIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_EXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_UPDPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_UPDSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_POLEXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_FLUSHSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_NEWAE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_GETAE, NETLINK_XFRM_SOCKET__NLMSG_READ },
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{ XFRM_MSG_REPORT, NETLINK_XFRM_SOCKET__NLMSG_READ },
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{ XFRM_MSG_MIGRATE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_NEWSADINFO, NETLINK_XFRM_SOCKET__NLMSG_READ },
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{ XFRM_MSG_GETSADINFO, NETLINK_XFRM_SOCKET__NLMSG_READ },
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{ XFRM_MSG_NEWSPDINFO, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
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{ XFRM_MSG_GETSPDINFO, NETLINK_XFRM_SOCKET__NLMSG_READ },
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{ XFRM_MSG_MAPPING, NETLINK_XFRM_SOCKET__NLMSG_READ },
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};
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static struct nlmsg_perm nlmsg_audit_perms[] =
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{
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{ AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },
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{ AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
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{ AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
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{ AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
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{ AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
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{ AUDIT_LIST_RULES, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
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{ AUDIT_ADD_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
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{ AUDIT_DEL_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
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{ AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_RELAY },
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{ AUDIT_SIGNAL_INFO, NETLINK_AUDIT_SOCKET__NLMSG_READ },
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{ AUDIT_TRIM, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
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{ AUDIT_MAKE_EQUIV, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
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{ AUDIT_TTY_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },
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{ AUDIT_TTY_SET, NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT },
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{ AUDIT_GET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_READ },
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{ AUDIT_SET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
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};
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static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize)
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{
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int i, err = -EINVAL;
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for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
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if (nlmsg_type == tab[i].nlmsg_type) {
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*perm = tab[i].perm;
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err = 0;
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break;
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}
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return err;
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}
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int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
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{
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int err = 0;
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switch (sclass) {
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case SECCLASS_NETLINK_ROUTE_SOCKET:
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/* RTM_MAX always point to RTM_SETxxxx, ie RTM_NEWxxx + 3 */
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BUILD_BUG_ON(RTM_MAX != (RTM_NEWSTATS + 3));
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err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
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sizeof(nlmsg_route_perms));
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break;
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case SECCLASS_NETLINK_TCPDIAG_SOCKET:
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err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
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sizeof(nlmsg_tcpdiag_perms));
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break;
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case SECCLASS_NETLINK_XFRM_SOCKET:
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BUILD_BUG_ON(XFRM_MSG_MAX != XFRM_MSG_MAPPING);
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err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
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sizeof(nlmsg_xfrm_perms));
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break;
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case SECCLASS_NETLINK_AUDIT_SOCKET:
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if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
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nlmsg_type <= AUDIT_LAST_USER_MSG) ||
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(nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
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nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
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*perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
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} else {
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err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
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sizeof(nlmsg_audit_perms));
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}
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break;
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/* No messaging from userspace, or class unknown/unhandled */
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default:
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err = -ENOENT;
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break;
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}
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return err;
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}
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static void nlmsg_set_getlink_perm(u32 perm)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(nlmsg_route_perms); i++) {
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if (nlmsg_route_perms[i].nlmsg_type == RTM_GETLINK) {
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nlmsg_route_perms[i].perm = perm;
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break;
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}
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}
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}
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/**
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* Use nlmsg_readpriv as the permission for RTM_GETLINK messages if the
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* netlink_route_getlink policy capability is set. Otherwise use nlmsg_read.
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*/
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void selinux_nlmsg_init(void)
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{
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if (selinux_android_netlink_route)
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nlmsg_set_getlink_perm(NETLINK_ROUTE_SOCKET__NLMSG_READPRIV);
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else
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nlmsg_set_getlink_perm(NETLINK_ROUTE_SOCKET__NLMSG_READ);
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}
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