640 lines
14 KiB
C
640 lines
14 KiB
C
/* $NetBSD: ip_auth.c,v 1.30 2002/09/19 08:12:45 martti Exp $ */
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/*
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* Copyright (C) 1998-2001 by Darren Reed & Guido van Rooij.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*/
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#ifdef __sgi
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# include <sys/ptimers.h>
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#endif
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#include <sys/errno.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/file.h>
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#if !defined(_KERNEL) && !defined(KERNEL)
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# include <stdio.h>
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# include <stdlib.h>
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# include <string.h>
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#endif
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#if (defined(KERNEL) || defined(_KERNEL)) && (__FreeBSD_version >= 220000)
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# include <sys/filio.h>
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# include <sys/fcntl.h>
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#else
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# include <sys/ioctl.h>
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#endif
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#ifndef linux
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# include <sys/protosw.h>
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#endif
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#include <sys/socket.h>
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#if (defined(_KERNEL) || defined(KERNEL)) && !defined(linux)
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# include <sys/systm.h>
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#endif
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#if !defined(__SVR4) && !defined(__svr4__)
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# ifndef linux
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# include <sys/mbuf.h>
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# endif
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#else
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# include <sys/filio.h>
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# include <sys/byteorder.h>
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# ifdef _KERNEL
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# include <sys/dditypes.h>
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# endif
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# include <sys/stream.h>
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# include <sys/kmem.h>
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#endif
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#if (_BSDI_VERSION >= 199802) || (__FreeBSD_version >= 400000)
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# include <sys/queue.h>
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#endif
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#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(bsdi)
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# include <machine/cpu.h>
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#endif
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#include <net/if.h>
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#ifdef sun
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# include <net/af.h>
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#endif
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#ifndef KERNEL
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# define KERNEL
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# define NOT_KERNEL
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#endif
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#ifndef linux
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# include <netinet/ip_var.h>
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#endif
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#ifdef NOT_KERNEL
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# undef KERNEL
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#endif
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#ifdef __sgi
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# ifdef IFF_DRVRLOCK /* IRIX6 */
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# include <sys/hashing.h>
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# endif
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#endif
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#include <netinet/tcp.h>
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#if defined(__sgi) && !defined(IFF_DRVRLOCK) /* IRIX < 6 */
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extern struct ifqueue ipintrq; /* ip packet input queue */
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#else
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# ifndef linux
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# if __FreeBSD_version >= 300000
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# include <net/if_var.h>
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# endif
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# include <netinet/in_var.h>
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# include <netinet/tcp_fsm.h>
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# endif
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#endif
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#include <netinet/udp.h>
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#include <netinet/ip_icmp.h>
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#include "netinet/ip_compat.h"
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#include <netinet/tcpip.h>
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#include "netinet/ip_fil.h"
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#include "netinet/ip_auth.h"
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#if !SOLARIS && !defined(linux)
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# include <net/netisr.h>
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# ifdef __FreeBSD__
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# include <machine/cpufunc.h>
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# endif
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#endif
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#if (__FreeBSD_version >= 300000)
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# include <sys/malloc.h>
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# if (defined(_KERNEL) || defined(KERNEL)) && !defined(IPFILTER_LKM)
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# include <sys/libkern.h>
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# include <sys/systm.h>
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# endif
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#endif
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#if !defined(lint)
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#if defined(__NetBSD__)
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ip_auth.c,v 1.30 2002/09/19 08:12:45 martti Exp $");
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#else
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static const char rcsid[] = "@(#)Id: ip_auth.c,v 2.11.2.20 2002/06/04 14:40:42 darrenr Exp";
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#endif
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#endif
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#if (SOLARIS || defined(__sgi)) && defined(_KERNEL)
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extern KRWLOCK_T ipf_auth, ipf_mutex;
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extern kmutex_t ipf_authmx;
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# if SOLARIS
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extern kcondvar_t ipfauthwait;
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# endif
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#endif
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#ifdef linux
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static struct wait_queue *ipfauthwait = NULL;
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#endif
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int fr_authsize = FR_NUMAUTH;
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int fr_authused = 0;
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int fr_defaultauthage = 600;
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int fr_auth_lock = 0;
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fr_authstat_t fr_authstats;
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static frauth_t fr_auth[FR_NUMAUTH];
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mb_t *fr_authpkts[FR_NUMAUTH];
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static int fr_authstart = 0, fr_authend = 0, fr_authnext = 0;
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static frauthent_t *fae_list = NULL;
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frentry_t *ipauth = NULL,
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*fr_authlist = NULL;
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/*
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* Check if a packet has authorization. If the packet is found to match an
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* authorization result and that would result in a feedback loop (i.e. it
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* will end up returning FR_AUTH) then return FR_BLOCK instead.
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*/
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u_32_t fr_checkauth(ip, fin)
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ip_t *ip;
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fr_info_t *fin;
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{
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u_short id = ip->ip_id;
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frentry_t *fr;
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frauth_t *fra;
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u_32_t pass;
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int i;
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if (fr_auth_lock || !fr_authused)
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return 0;
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READ_ENTER(&ipf_auth);
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for (i = fr_authstart; i != fr_authend; ) {
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/*
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* index becomes -2 only after an SIOCAUTHW. Check this in
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* case the same packet gets sent again and it hasn't yet been
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* auth'd.
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*/
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fra = fr_auth + i;
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if ((fra->fra_index == -2) && (id == fra->fra_info.fin_id) &&
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!bcmp((char *)fin, (char *)&fra->fra_info, FI_CSIZE)) {
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/*
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* Avoid feedback loop.
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*/
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if (!(pass = fra->fra_pass) || (pass & FR_AUTH))
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pass = FR_BLOCK;
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/*
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* Create a dummy rule for the stateful checking to
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* use and return. Zero out any values we don't
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* trust from userland!
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*/
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if ((pass & FR_KEEPSTATE) || ((pass & FR_KEEPFRAG) &&
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(fin->fin_fi.fi_fl & FI_FRAG))) {
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KMALLOC(fr, frentry_t *);
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if (fr) {
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bcopy((char *)fra->fra_info.fin_fr,
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fr, sizeof(*fr));
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fr->fr_grp = NULL;
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fr->fr_ifa = fin->fin_ifp;
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fr->fr_func = NULL;
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fr->fr_ref = 1;
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fr->fr_flags = pass;
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#if BSD >= 199306
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fr->fr_oifa = NULL;
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#endif
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}
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} else
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fr = fra->fra_info.fin_fr;
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fin->fin_fr = fr;
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RWLOCK_EXIT(&ipf_auth);
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WRITE_ENTER(&ipf_auth);
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if (fr && fr != fra->fra_info.fin_fr) {
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fr->fr_next = fr_authlist;
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fr_authlist = fr;
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}
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fr_authstats.fas_hits++;
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fra->fra_index = -1;
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fr_authused--;
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if (i == fr_authstart) {
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while (fra->fra_index == -1) {
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i++;
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fra++;
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if (i == FR_NUMAUTH) {
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i = 0;
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fra = fr_auth;
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}
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fr_authstart = i;
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if (i == fr_authend)
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break;
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}
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if (fr_authstart == fr_authend) {
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fr_authnext = 0;
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fr_authstart = fr_authend = 0;
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}
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}
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RWLOCK_EXIT(&ipf_auth);
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return pass;
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}
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i++;
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if (i == FR_NUMAUTH)
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i = 0;
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}
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fr_authstats.fas_miss++;
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RWLOCK_EXIT(&ipf_auth);
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return 0;
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}
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/*
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* Check if we have room in the auth array to hold details for another packet.
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* If we do, store it and wake up any user programs which are waiting to
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* hear about these events.
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*/
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int fr_newauth(m, fin, ip)
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mb_t *m;
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fr_info_t *fin;
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ip_t *ip;
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{
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#if defined(_KERNEL) && SOLARIS
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qif_t *qif = fin->fin_qif;
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#endif
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frauth_t *fra;
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int i;
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if (fr_auth_lock)
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return 0;
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WRITE_ENTER(&ipf_auth);
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if (fr_authstart > fr_authend) {
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fr_authstats.fas_nospace++;
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RWLOCK_EXIT(&ipf_auth);
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return 0;
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} else {
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if (fr_authused == FR_NUMAUTH) {
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fr_authstats.fas_nospace++;
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RWLOCK_EXIT(&ipf_auth);
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return 0;
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}
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}
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fr_authstats.fas_added++;
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fr_authused++;
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i = fr_authend++;
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if (fr_authend == FR_NUMAUTH)
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fr_authend = 0;
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RWLOCK_EXIT(&ipf_auth);
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fra = fr_auth + i;
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fra->fra_index = i;
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fra->fra_pass = 0;
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fra->fra_age = fr_defaultauthage;
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bcopy((char *)fin, (char *)&fra->fra_info, sizeof(*fin));
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#if SOLARIS && defined(_KERNEL)
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# if !defined(sparc)
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/*
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* No need to copyback here as we want to undo the changes, not keep
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* them.
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*/
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if ((ip == (ip_t *)m->b_rptr) && (ip->ip_v == 4))
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{
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register u_short bo;
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bo = ip->ip_len;
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ip->ip_len = htons(bo);
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bo = ip->ip_off;
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ip->ip_off = htons(bo);
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}
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# endif
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m->b_rptr -= qif->qf_off;
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fr_authpkts[i] = *(mblk_t **)fin->fin_mp;
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fra->fra_q = qif->qf_q;
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cv_signal(&ipfauthwait);
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#else
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# if defined(BSD) && !defined(sparc) && (BSD >= 199306)
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if (!fin->fin_out) {
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HTONS(ip->ip_len);
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HTONS(ip->ip_off);
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}
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# endif
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fr_authpkts[i] = m;
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WAKEUP(&fr_authnext);
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#endif
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return 1;
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}
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int fr_auth_ioctl(data, mode, cmd, fr, frptr)
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caddr_t data;
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int mode;
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#if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
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u_long cmd;
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#else
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int cmd;
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#endif
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frentry_t *fr, **frptr;
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{
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mb_t *m;
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#if defined(_KERNEL) && !SOLARIS
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struct ifqueue *ifq;
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int s;
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#endif
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frauth_t auth, *au = &auth, *fra;
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frauthent_t *fae, **faep;
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int i, error = 0;
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switch (cmd)
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{
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case SIOCSTLCK :
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error = fr_lock(data, &fr_auth_lock);
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break;
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case SIOCINIFR :
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case SIOCRMIFR :
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case SIOCADIFR :
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error = EINVAL;
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break;
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case SIOCINAFR :
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error = EINVAL;
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break;
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case SIOCRMAFR :
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case SIOCADAFR :
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for (faep = &fae_list; (fae = *faep); )
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if (&fae->fae_fr == fr)
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break;
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else
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faep = &fae->fae_next;
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if (cmd == SIOCRMAFR) {
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if (!fr || !frptr)
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error = EINVAL;
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else if (!fae)
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error = ESRCH;
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else {
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WRITE_ENTER(&ipf_auth);
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SPL_NET(s);
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*faep = fae->fae_next;
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*frptr = fr->fr_next;
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SPL_X(s);
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RWLOCK_EXIT(&ipf_auth);
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KFREE(fae);
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}
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} else if (fr && frptr) {
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KMALLOC(fae, frauthent_t *);
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if (fae != NULL) {
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bcopy((char *)fr, (char *)&fae->fae_fr,
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sizeof(*fr));
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WRITE_ENTER(&ipf_auth);
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SPL_NET(s);
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fae->fae_age = fr_defaultauthage;
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fae->fae_fr.fr_hits = 0;
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fae->fae_fr.fr_next = *frptr;
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*frptr = &fae->fae_fr;
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fae->fae_next = *faep;
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*faep = fae;
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ipauth = &fae_list->fae_fr;
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SPL_X(s);
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RWLOCK_EXIT(&ipf_auth);
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} else
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error = ENOMEM;
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} else
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error = EINVAL;
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break;
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case SIOCATHST:
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fr_authstats.fas_faelist = fae_list;
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error = IWCOPYPTR((char *)&fr_authstats, data,
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sizeof(fr_authstats));
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break;
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case SIOCAUTHW:
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if (!(mode & FWRITE)) {
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error = EPERM;
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break;
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}
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fr_authioctlloop:
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READ_ENTER(&ipf_auth);
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if ((fr_authnext != fr_authend) && fr_authpkts[fr_authnext]) {
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error = IWCOPYPTR((char *)&fr_auth[fr_authnext], data,
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sizeof(frauth_t));
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RWLOCK_EXIT(&ipf_auth);
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if (error)
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break;
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WRITE_ENTER(&ipf_auth);
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SPL_NET(s);
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fr_authnext++;
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if (fr_authnext == FR_NUMAUTH)
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fr_authnext = 0;
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SPL_X(s);
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RWLOCK_EXIT(&ipf_auth);
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return 0;
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}
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RWLOCK_EXIT(&ipf_auth);
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#ifdef _KERNEL
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# if SOLARIS
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mutex_enter(&ipf_authmx);
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if (!cv_wait_sig(&ipfauthwait, &ipf_authmx)) {
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mutex_exit(&ipf_authmx);
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return EINTR;
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}
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mutex_exit(&ipf_authmx);
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# else
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error = SLEEP(&fr_authnext, "fr_authnext");
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# endif
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#endif
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if (!error)
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goto fr_authioctlloop;
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break;
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case SIOCAUTHR:
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if (!(mode & FWRITE)) {
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error = EPERM;
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break;
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}
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error = IRCOPYPTR(data, (caddr_t)&auth, sizeof(auth));
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if (error)
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return error;
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WRITE_ENTER(&ipf_auth);
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SPL_NET(s);
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i = au->fra_index;
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fra = fr_auth + i;
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if ((i < 0) || (i > FR_NUMAUTH) ||
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(fra->fra_info.fin_id != au->fra_info.fin_id)) {
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SPL_X(s);
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RWLOCK_EXIT(&ipf_auth);
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return EINVAL;
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}
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m = fr_authpkts[i];
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fra->fra_index = -2;
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fra->fra_pass = au->fra_pass;
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fr_authpkts[i] = NULL;
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RWLOCK_EXIT(&ipf_auth);
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#ifdef _KERNEL
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if (m && au->fra_info.fin_out) {
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# if SOLARIS
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error = (fr_qout(fra->fra_q, m) == 0) ? EINVAL : 0;
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# else /* SOLARIS */
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struct route ro;
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bzero((char *)&ro, sizeof(ro));
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# if ((_BSDI_VERSION >= 199802) && (_BSDI_VERSION < 200005)) || \
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defined(__OpenBSD__) || (defined(IRIX) && (IRIX >= 605))
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error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL,
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NULL);
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# else
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error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL);
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# endif
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if (ro.ro_rt) {
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RTFREE(ro.ro_rt);
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}
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# endif /* SOLARIS */
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if (error)
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fr_authstats.fas_sendfail++;
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else
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fr_authstats.fas_sendok++;
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} else if (m) {
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# if SOLARIS
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error = (fr_qin(fra->fra_q, m) == 0) ? EINVAL : 0;
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# else /* SOLARIS */
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ifq = &ipintrq;
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if (IF_QFULL(ifq)) {
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IF_DROP(ifq);
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m_freem(m);
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error = ENOBUFS;
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} else {
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IF_ENQUEUE(ifq, m);
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# if IRIX < 605
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schednetisr(NETISR_IP);
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# endif
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}
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# endif /* SOLARIS */
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if (error)
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fr_authstats.fas_quefail++;
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else
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fr_authstats.fas_queok++;
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} else
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error = EINVAL;
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# if SOLARIS
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if (error)
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error = EINVAL;
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# else
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/*
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* If we experience an error which will result in the packet
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* not being processed, make sure we advance to the next one.
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*/
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if (error == ENOBUFS) {
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fr_authused--;
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fra->fra_index = -1;
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fra->fra_pass = 0;
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if (i == fr_authstart) {
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while (fra->fra_index == -1) {
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i++;
|
|
if (i == FR_NUMAUTH)
|
|
i = 0;
|
|
fr_authstart = i;
|
|
if (i == fr_authend)
|
|
break;
|
|
}
|
|
if (fr_authstart == fr_authend) {
|
|
fr_authnext = 0;
|
|
fr_authstart = fr_authend = 0;
|
|
}
|
|
}
|
|
}
|
|
# endif
|
|
#endif /* _KERNEL */
|
|
SPL_X(s);
|
|
break;
|
|
default :
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
|
|
/*
|
|
* Free all network buffer memory used to keep saved packets.
|
|
*/
|
|
void fr_authunload()
|
|
{
|
|
register int i;
|
|
register frauthent_t *fae, **faep;
|
|
frentry_t *fr, **frp;
|
|
mb_t *m;
|
|
|
|
WRITE_ENTER(&ipf_auth);
|
|
for (i = 0; i < FR_NUMAUTH; i++) {
|
|
if ((m = fr_authpkts[i])) {
|
|
FREE_MB_T(m);
|
|
fr_authpkts[i] = NULL;
|
|
fr_auth[i].fra_index = -1;
|
|
}
|
|
}
|
|
|
|
|
|
for (faep = &fae_list; (fae = *faep); ) {
|
|
*faep = fae->fae_next;
|
|
KFREE(fae);
|
|
}
|
|
ipauth = NULL;
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
|
|
if (fr_authlist) {
|
|
/*
|
|
* We *MuST* reget ipf_auth because otherwise we won't get the
|
|
* locks in the right order and risk deadlock.
|
|
* We need ipf_mutex here to prevent a rule from using it
|
|
* inside fr_check().
|
|
*/
|
|
WRITE_ENTER(&ipf_mutex);
|
|
WRITE_ENTER(&ipf_auth);
|
|
for (frp = &fr_authlist; (fr = *frp); ) {
|
|
if (fr->fr_ref == 1) {
|
|
*frp = fr->fr_next;
|
|
KFREE(fr);
|
|
} else
|
|
frp = &fr->fr_next;
|
|
}
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
RWLOCK_EXIT(&ipf_mutex);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Slowly expire held auth records. Timeouts are set
|
|
* in expectation of this being called twice per second.
|
|
*/
|
|
void fr_authexpire()
|
|
{
|
|
register int i;
|
|
register frauth_t *fra;
|
|
register frauthent_t *fae, **faep;
|
|
register frentry_t *fr, **frp;
|
|
mb_t *m;
|
|
#if !SOLARIS && defined(_KERNEL)
|
|
int s;
|
|
#endif
|
|
|
|
if (fr_auth_lock)
|
|
return;
|
|
|
|
SPL_NET(s);
|
|
WRITE_ENTER(&ipf_auth);
|
|
for (i = 0, fra = fr_auth; i < FR_NUMAUTH; i++, fra++) {
|
|
if ((!--fra->fra_age) && (m = fr_authpkts[i])) {
|
|
FREE_MB_T(m);
|
|
fr_authpkts[i] = NULL;
|
|
fr_auth[i].fra_index = -1;
|
|
fr_authstats.fas_expire++;
|
|
fr_authused--;
|
|
}
|
|
}
|
|
|
|
for (faep = &fae_list; (fae = *faep); ) {
|
|
if (!--fae->fae_age) {
|
|
*faep = fae->fae_next;
|
|
KFREE(fae);
|
|
fr_authstats.fas_expire++;
|
|
} else
|
|
faep = &fae->fae_next;
|
|
}
|
|
if (fae_list != NULL)
|
|
ipauth = &fae_list->fae_fr;
|
|
else
|
|
ipauth = NULL;
|
|
|
|
for (frp = &fr_authlist; (fr = *frp); ) {
|
|
if (fr->fr_ref == 1) {
|
|
*frp = fr->fr_next;
|
|
KFREE(fr);
|
|
} else
|
|
frp = &fr->fr_next;
|
|
}
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
SPL_X(s);
|
|
}
|