The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix
607 lines
16 KiB
C
607 lines
16 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
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* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
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* Internet Initiative Japan, Inc (IIJ)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <stdarg.h>
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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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#include <termios.h>
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#include "layer.h"
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#include "defs.h"
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#include "command.h"
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#include "mbuf.h"
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#include "log.h"
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#include "iplist.h"
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#include "timer.h"
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#include "throughput.h"
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#include "lqr.h"
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#include "hdlc.h"
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#include "fsm.h"
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#include "lcp.h"
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#include "ccp.h"
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#include "link.h"
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#include "slcompress.h"
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#include "ncpaddr.h"
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#include "ipcp.h"
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#include "filter.h"
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#include "descriptor.h"
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#include "prompt.h"
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#include "mp.h"
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#ifndef NORADIUS
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#include "radius.h"
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#endif
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#include "ipv6cp.h"
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#include "ncp.h"
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#include "bundle.h"
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static unsigned filter_Nam2Op(const char *);
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static int
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ParsePort(const char *service, const char *proto)
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{
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struct servent *servent;
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char *cp;
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int port;
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servent = getservbyname(service, proto);
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if (servent != NULL)
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return ntohs(servent->s_port);
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port = strtol(service, &cp, 0);
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if (cp == service) {
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log_Printf(LogWARN, "ParsePort: %s is not a port name or number.\n",
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service);
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return 0;
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}
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return port;
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}
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/*
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* ICMP Syntax: src eq icmp_message_type
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*/
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static int
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ParseIcmp(int argc, char const *const *argv, struct filterent *tgt)
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{
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int type;
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char *cp;
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switch (argc) {
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case 0:
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/* permit/deny all ICMP types */
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tgt->f_srcop = tgt->f_dstop = OP_NONE;
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break;
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case 3:
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if (!strcmp(*argv, "src") && !strcmp(argv[1], "eq")) {
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type = strtol(argv[2], &cp, 0);
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if (cp == argv[2]) {
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log_Printf(LogWARN, "ParseIcmp: type is expected.\n");
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return 0;
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}
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tgt->f_srcop = OP_EQ;
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tgt->f_srcport = type;
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tgt->f_dstop = OP_NONE;
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}
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break;
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default:
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log_Printf(LogWARN, "ParseIcmp: bad icmp syntax.\n");
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return 0;
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}
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return 1;
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}
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/*
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* UDP Syntax: [src op port] [dst op port]
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*/
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static int
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ParseUdpOrTcp(int argc, char const *const *argv, const struct protoent *pe,
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struct filterent *tgt)
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{
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tgt->f_srcop = tgt->f_dstop = OP_NONE;
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tgt->f_estab = tgt->f_syn = tgt->f_finrst = 0;
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if (argc >= 3 && !strcmp(*argv, "src")) {
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tgt->f_srcop = filter_Nam2Op(argv[1]);
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if (tgt->f_srcop == OP_NONE) {
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log_Printf(LogWARN, "ParseUdpOrTcp: bad operator\n");
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return 0;
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}
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if (pe == NULL)
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return 0;
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tgt->f_srcport = ParsePort(argv[2], pe->p_name);
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if (tgt->f_srcport == 0)
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return 0;
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argc -= 3;
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argv += 3;
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}
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if (argc >= 3 && !strcmp(argv[0], "dst")) {
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tgt->f_dstop = filter_Nam2Op(argv[1]);
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if (tgt->f_dstop == OP_NONE) {
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log_Printf(LogWARN, "ParseUdpOrTcp: bad operator\n");
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return 0;
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}
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if (pe == NULL)
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return 0;
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tgt->f_dstport = ParsePort(argv[2], pe->p_name);
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if (tgt->f_dstport == 0)
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return 0;
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argc -= 3;
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argv += 3;
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}
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if (pe && pe->p_proto == IPPROTO_TCP) {
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for (; argc > 0; argc--, argv++)
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if (!strcmp(*argv, "estab"))
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tgt->f_estab = 1;
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else if (!strcmp(*argv, "syn"))
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tgt->f_syn = 1;
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else if (!strcmp(*argv, "finrst"))
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tgt->f_finrst = 1;
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else
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break;
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}
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if (argc > 0) {
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log_Printf(LogWARN, "ParseUdpOrTcp: bad src/dst port syntax: %s\n", *argv);
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return 0;
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}
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return 1;
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}
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static int
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ParseGeneric(int argc, struct filterent *tgt)
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{
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/*
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* Filter currently is a catch-all. Requests are either permitted or
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* dropped.
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*/
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if (argc != 0) {
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log_Printf(LogWARN, "ParseGeneric: Too many parameters\n");
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return 0;
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} else
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tgt->f_srcop = tgt->f_dstop = OP_NONE;
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return 1;
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}
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static unsigned
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addrtype(const char *addr)
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{
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if (!strncasecmp(addr, "MYADDR", 6) && (addr[6] == '\0' || addr[6] == '/'))
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return T_MYADDR;
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if (!strncasecmp(addr, "MYADDR6", 7) && (addr[7] == '\0' || addr[7] == '/'))
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return T_MYADDR6;
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if (!strncasecmp(addr, "HISADDR", 7) && (addr[7] == '\0' || addr[7] == '/'))
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return T_HISADDR;
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if (!strncasecmp(addr, "HISADDR6", 8) && (addr[8] == '\0' || addr[8] == '/'))
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return T_HISADDR6;
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if (!strncasecmp(addr, "DNS0", 4) && (addr[4] == '\0' || addr[4] == '/'))
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return T_DNS0;
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if (!strncasecmp(addr, "DNS1", 4) && (addr[4] == '\0' || addr[4] == '/'))
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return T_DNS1;
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return T_ADDR;
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}
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static const char *
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addrstr(struct ncprange *addr, unsigned type)
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{
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switch (type) {
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case T_MYADDR:
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return "MYADDR";
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case T_HISADDR:
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return "HISADDR";
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case T_DNS0:
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return "DNS0";
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case T_DNS1:
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return "DNS1";
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}
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return ncprange_ntoa(addr);
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}
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static int
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filter_Parse(struct ncp *ncp, int argc, char const *const *argv,
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struct filterent *ofp)
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{
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struct filterent fe;
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struct protoent *pe;
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char *wp;
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int action, family, ruleno, val, width;
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ruleno = strtol(*argv, &wp, 0);
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if (*argv == wp || ruleno >= MAXFILTERS) {
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log_Printf(LogWARN, "Parse: invalid filter number.\n");
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return 0;
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}
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if (ruleno < 0) {
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for (ruleno = 0; ruleno < MAXFILTERS; ruleno++) {
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ofp->f_action = A_NONE;
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ofp++;
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}
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log_Printf(LogWARN, "Parse: filter cleared.\n");
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return 1;
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}
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ofp += ruleno;
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if (--argc == 0) {
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log_Printf(LogWARN, "Parse: missing action.\n");
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return 0;
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}
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argv++;
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memset(&fe, '\0', sizeof fe);
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val = strtol(*argv, &wp, 0);
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if (!*wp && val >= 0 && val < MAXFILTERS) {
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if (val <= ruleno) {
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log_Printf(LogWARN, "Parse: Can only jump forward from rule %d\n",
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ruleno);
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return 0;
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}
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action = val;
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} else if (!strcmp(*argv, "permit")) {
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action = A_PERMIT;
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} else if (!strcmp(*argv, "deny")) {
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action = A_DENY;
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} else if (!strcmp(*argv, "clear")) {
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ofp->f_action = A_NONE;
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return 1;
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} else {
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log_Printf(LogWARN, "Parse: %s: bad action\n", *argv);
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return 0;
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}
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fe.f_action = action;
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argc--;
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argv++;
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if (argc && argv[0][0] == '!' && !argv[0][1]) {
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fe.f_invert = 1;
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argc--;
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argv++;
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}
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ncprange_init(&fe.f_src);
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ncprange_init(&fe.f_dst);
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if (argc == 0)
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pe = NULL;
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else if ((pe = getprotobyname(*argv)) == NULL && strcmp(*argv, "all") != 0) {
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if (argc < 2) {
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log_Printf(LogWARN, "Parse: Protocol or address pair expected\n");
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return 0;
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} else if (strcasecmp(*argv, "any") == 0 ||
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ncprange_aton(&fe.f_src, ncp, *argv)) {
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family = ncprange_family(&fe.f_src);
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if (!ncprange_getwidth(&fe.f_src, &width))
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width = 0;
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if (width == 0)
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ncprange_init(&fe.f_src);
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fe.f_srctype = addrtype(*argv);
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argc--;
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argv++;
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if (strcasecmp(*argv, "any") == 0 ||
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ncprange_aton(&fe.f_dst, ncp, *argv)) {
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if (ncprange_family(&fe.f_dst) != AF_UNSPEC &&
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ncprange_family(&fe.f_src) != AF_UNSPEC &&
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family != ncprange_family(&fe.f_dst)) {
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log_Printf(LogWARN, "Parse: src and dst address families differ\n");
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return 0;
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}
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if (!ncprange_getwidth(&fe.f_dst, &width))
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width = 0;
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if (width == 0)
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ncprange_init(&fe.f_dst);
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fe.f_dsttype = addrtype(*argv);
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argc--;
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argv++;
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} else {
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log_Printf(LogWARN, "Parse: Protocol or address pair expected\n");
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return 0;
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}
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if (argc) {
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if ((pe = getprotobyname(*argv)) == NULL && strcmp(*argv, "all") != 0) {
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log_Printf(LogWARN, "Parse: %s: Protocol expected\n", *argv);
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return 0;
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} else {
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argc--;
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argv++;
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}
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}
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} else {
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log_Printf(LogWARN, "Parse: Protocol or address pair expected\n");
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return 0;
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}
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} else {
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argc--;
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argv++;
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}
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if (argc >= 2 && strcmp(*argv, "timeout") == 0) {
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fe.timeout = strtoul(argv[1], NULL, 10);
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argc -= 2;
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argv += 2;
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}
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val = 1;
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fe.f_proto = (pe == NULL) ? 0 : pe->p_proto;
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switch (fe.f_proto) {
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case IPPROTO_TCP:
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case IPPROTO_UDP:
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case IPPROTO_IPIP:
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#ifndef NOINET6
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case IPPROTO_IPV6:
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#endif
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val = ParseUdpOrTcp(argc, argv, pe, &fe);
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break;
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case IPPROTO_ICMP:
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#ifndef NOINET6
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case IPPROTO_ICMPV6:
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#endif
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val = ParseIcmp(argc, argv, &fe);
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break;
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default:
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val = ParseGeneric(argc, &fe);
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break;
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}
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log_Printf(LogDEBUG, "Parse: Src: %s\n", ncprange_ntoa(&fe.f_src));
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log_Printf(LogDEBUG, "Parse: Dst: %s\n", ncprange_ntoa(&fe.f_dst));
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log_Printf(LogDEBUG, "Parse: Proto: %d\n", fe.f_proto);
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log_Printf(LogDEBUG, "Parse: src: %s (%d)\n",
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filter_Op2Nam(fe.f_srcop), fe.f_srcport);
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log_Printf(LogDEBUG, "Parse: dst: %s (%d)\n",
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filter_Op2Nam(fe.f_dstop), fe.f_dstport);
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log_Printf(LogDEBUG, "Parse: estab: %u\n", fe.f_estab);
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log_Printf(LogDEBUG, "Parse: syn: %u\n", fe.f_syn);
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log_Printf(LogDEBUG, "Parse: finrst: %u\n", fe.f_finrst);
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if (val)
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*ofp = fe;
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return val;
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}
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int
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filter_Set(struct cmdargs const *arg)
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{
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struct filter *filter;
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if (arg->argc < arg->argn+2)
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return -1;
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if (!strcmp(arg->argv[arg->argn], "in"))
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filter = &arg->bundle->filter.in;
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else if (!strcmp(arg->argv[arg->argn], "out"))
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filter = &arg->bundle->filter.out;
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else if (!strcmp(arg->argv[arg->argn], "dial"))
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filter = &arg->bundle->filter.dial;
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else if (!strcmp(arg->argv[arg->argn], "alive"))
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filter = &arg->bundle->filter.alive;
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else {
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log_Printf(LogWARN, "filter_Set: %s: Invalid filter name.\n",
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arg->argv[arg->argn]);
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return -1;
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}
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filter_Parse(&arg->bundle->ncp, arg->argc - arg->argn - 1,
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arg->argv + arg->argn + 1, filter->rule);
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return 0;
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}
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const char *
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filter_Action2Nam(unsigned act)
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{
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static const char * const actname[] = { " none ", "permit ", " deny " };
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static char buf[8];
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if (act < MAXFILTERS) {
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snprintf(buf, sizeof buf, "%6d ", act);
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return buf;
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} else if (act >= A_NONE && act < A_NONE + sizeof(actname)/sizeof(char *))
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return actname[act - A_NONE];
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else
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return "?????? ";
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}
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static void
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doShowFilter(struct filterent *fp, struct prompt *prompt)
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{
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struct protoent *pe;
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int n;
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for (n = 0; n < MAXFILTERS; n++, fp++) {
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if (fp->f_action != A_NONE) {
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prompt_Printf(prompt, " %2d %s", n, filter_Action2Nam(fp->f_action));
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prompt_Printf(prompt, "%c ", fp->f_invert ? '!' : ' ');
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if (ncprange_isset(&fp->f_src))
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prompt_Printf(prompt, "%s ", addrstr(&fp->f_src, fp->f_srctype));
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else
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prompt_Printf(prompt, "any ");
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if (ncprange_isset(&fp->f_dst))
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prompt_Printf(prompt, "%s ", addrstr(&fp->f_dst, fp->f_dsttype));
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else
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prompt_Printf(prompt, "any ");
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if (fp->f_proto) {
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if ((pe = getprotobynumber(fp->f_proto)) == NULL)
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prompt_Printf(prompt, "P:%d", fp->f_proto);
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else
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prompt_Printf(prompt, "%s", pe->p_name);
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if (fp->f_srcop)
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prompt_Printf(prompt, " src %s %d", filter_Op2Nam(fp->f_srcop),
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fp->f_srcport);
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if (fp->f_dstop)
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prompt_Printf(prompt, " dst %s %d", filter_Op2Nam(fp->f_dstop),
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fp->f_dstport);
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if (fp->f_estab)
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prompt_Printf(prompt, " estab");
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if (fp->f_syn)
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prompt_Printf(prompt, " syn");
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if (fp->f_finrst)
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prompt_Printf(prompt, " finrst");
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} else
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prompt_Printf(prompt, "all");
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if (fp->timeout != 0)
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prompt_Printf(prompt, " timeout %u", fp->timeout);
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prompt_Printf(prompt, "\n");
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}
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}
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}
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int
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filter_Show(struct cmdargs const *arg)
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{
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if (arg->argc > arg->argn+1)
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return -1;
|
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|
|
if (arg->argc == arg->argn+1) {
|
|
struct filter *filter;
|
|
|
|
if (!strcmp(arg->argv[arg->argn], "in"))
|
|
filter = &arg->bundle->filter.in;
|
|
else if (!strcmp(arg->argv[arg->argn], "out"))
|
|
filter = &arg->bundle->filter.out;
|
|
else if (!strcmp(arg->argv[arg->argn], "dial"))
|
|
filter = &arg->bundle->filter.dial;
|
|
else if (!strcmp(arg->argv[arg->argn], "alive"))
|
|
filter = &arg->bundle->filter.alive;
|
|
else
|
|
return -1;
|
|
doShowFilter(filter->rule, arg->prompt);
|
|
} else {
|
|
struct filter *filter[4];
|
|
int f;
|
|
|
|
filter[0] = &arg->bundle->filter.in;
|
|
filter[1] = &arg->bundle->filter.out;
|
|
filter[2] = &arg->bundle->filter.dial;
|
|
filter[3] = &arg->bundle->filter.alive;
|
|
for (f = 0; f < 4; f++) {
|
|
if (f)
|
|
prompt_Printf(arg->prompt, "\n");
|
|
prompt_Printf(arg->prompt, "%s:\n", filter[f]->name);
|
|
doShowFilter(filter[f]->rule, arg->prompt);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const char * const opname[] = {"none", "eq", "gt", "lt"};
|
|
|
|
const char *
|
|
filter_Op2Nam(unsigned op)
|
|
{
|
|
if (op >= sizeof opname / sizeof opname[0])
|
|
return "unknown";
|
|
return opname[op];
|
|
|
|
}
|
|
|
|
static unsigned
|
|
filter_Nam2Op(const char *cp)
|
|
{
|
|
unsigned op;
|
|
|
|
for (op = sizeof opname / sizeof opname[0] - 1; op; op--)
|
|
if (!strcasecmp(cp, opname[op]))
|
|
break;
|
|
|
|
return op;
|
|
}
|
|
|
|
void
|
|
filter_AdjustAddr(struct filter *filter, struct ncpaddr *local,
|
|
struct ncpaddr *remote, struct in_addr *dns)
|
|
{
|
|
struct filterent *fp;
|
|
int n;
|
|
|
|
for (fp = filter->rule, n = 0; n < MAXFILTERS; fp++, n++)
|
|
if (fp->f_action != A_NONE) {
|
|
if (local) {
|
|
if (fp->f_srctype == T_MYADDR && ncpaddr_family(local) == AF_INET)
|
|
ncprange_sethost(&fp->f_src, local);
|
|
if (fp->f_dsttype == T_MYADDR && ncpaddr_family(local) == AF_INET)
|
|
ncprange_sethost(&fp->f_dst, local);
|
|
#ifndef NOINET6
|
|
if (fp->f_srctype == T_MYADDR6 && ncpaddr_family(local) == AF_INET6)
|
|
ncprange_sethost(&fp->f_src, local);
|
|
if (fp->f_dsttype == T_MYADDR6 && ncpaddr_family(local) == AF_INET6)
|
|
ncprange_sethost(&fp->f_dst, local);
|
|
#endif
|
|
}
|
|
if (remote) {
|
|
if (fp->f_srctype == T_HISADDR && ncpaddr_family(remote) == AF_INET)
|
|
ncprange_sethost(&fp->f_src, remote);
|
|
if (fp->f_dsttype == T_HISADDR && ncpaddr_family(remote) == AF_INET)
|
|
ncprange_sethost(&fp->f_dst, remote);
|
|
#ifndef NOINET6
|
|
if (fp->f_srctype == T_HISADDR6 && ncpaddr_family(remote) == AF_INET6)
|
|
ncprange_sethost(&fp->f_src, remote);
|
|
if (fp->f_dsttype == T_HISADDR6 && ncpaddr_family(remote) == AF_INET6)
|
|
ncprange_sethost(&fp->f_dst, remote);
|
|
#endif
|
|
}
|
|
if (dns) {
|
|
if (fp->f_srctype == T_DNS0)
|
|
ncprange_setip4host(&fp->f_src, dns[0]);
|
|
if (fp->f_dsttype == T_DNS0)
|
|
ncprange_setip4host(&fp->f_dst, dns[0]);
|
|
if (fp->f_srctype == T_DNS1)
|
|
ncprange_setip4host(&fp->f_src, dns[1]);
|
|
if (fp->f_dsttype == T_DNS1)
|
|
ncprange_setip4host(&fp->f_dst, dns[1]);
|
|
}
|
|
}
|
|
}
|