706 lines
15 KiB
C
706 lines
15 KiB
C
/*
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* Copyright (c) 1996 Poul-Henning Kamp
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* Copyright (c) 1994 Ugen J.S.Antsilevich
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* Idea and grammar partially left from:
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* Copyright (c) 1993 Daniel Boulet
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*
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* Redistribution and use in source forms, with and without modification,
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* are permitted provided that this entire comment appears intact.
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*
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* Redistribution in binary form may occur without any restrictions.
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* Obviously, it would be nice if you gave credit where credit is due
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* but requiring it would be too onerous.
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*
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* This software is provided ``AS IS'' without any warranties of any kind.
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*
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* NEW command line interface for IP firewall facility
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*
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* $Id: ipfw.c,v 1.20 1996/02/24 00:20:56 phk Exp $
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*
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*/
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#include <stdio.h>
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#include <ctype.h>
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#include <err.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <netdb.h>
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#include <limits.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/ip_fw.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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int lineno = -1;
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char progname[BUFSIZ]; /* Program name for errors */
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int s; /* main RAW socket */
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int do_resolv=0; /* Would try to resolv all */
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int do_acct=0; /* Show packet/byte count */
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int
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mask_bits(m_ad)
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struct in_addr m_ad;
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{
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int h_fnd=0,h_num=0,i;
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u_long mask;
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mask=ntohl(m_ad.s_addr);
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for (i=0;i<sizeof(u_long)*CHAR_BIT;i++) {
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if (mask & 1L) {
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h_fnd=1;
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h_num++;
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} else {
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if (h_fnd)
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return -1;
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}
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mask=mask>>1;
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}
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return h_num;
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}
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void
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show_ipfw(chain)
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struct ip_fw *chain;
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{
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char *comma;
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u_long adrt;
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struct hostent *he;
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int i,mb;
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printf("%05u ", chain->fw_number);
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if (do_acct)
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printf("%10lu %10lu ",chain->fw_pcnt,chain->fw_bcnt);
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if (chain->fw_flg & IP_FW_F_ACCEPT)
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printf("accept");
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else if (chain->fw_flg & IP_FW_F_ICMPRPL)
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printf("reject");
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else if (chain->fw_flg & IP_FW_F_COUNT)
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printf("count");
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else
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printf("deny");
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if (chain->fw_flg & IP_FW_F_PRN)
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printf(" log");
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switch (chain->fw_flg & IP_FW_F_KIND) {
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case IP_FW_F_ICMP:
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printf(" icmp ");
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break;
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case IP_FW_F_TCP:
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printf(" tcp ");
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break;
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case IP_FW_F_UDP:
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printf(" udp ");
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break;
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case IP_FW_F_ALL:
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printf(" all ");
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break;
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default:
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break;
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}
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printf("from ");
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adrt=ntohl(chain->fw_smsk.s_addr);
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if (adrt==ULONG_MAX && do_resolv) {
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adrt=(chain->fw_src.s_addr);
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he=gethostbyaddr((char *)&adrt,sizeof(u_long),AF_INET);
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if (he==NULL) {
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printf(inet_ntoa(chain->fw_src));
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} else
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printf("%s",he->h_name);
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} else {
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if (adrt!=ULONG_MAX) {
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mb=mask_bits(chain->fw_smsk);
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if (mb == 0) {
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printf("any");
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} else {
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if (mb > 0) {
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printf(inet_ntoa(chain->fw_src));
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printf("/%d",mb);
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} else {
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printf(inet_ntoa(chain->fw_src));
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printf(":");
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printf(inet_ntoa(chain->fw_smsk));
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}
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}
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} else
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printf(inet_ntoa(chain->fw_src));
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}
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comma = " ";
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for (i=0;i<chain->fw_nsp; i++ ) {
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printf("%s%d",comma,chain->fw_pts[i]);
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if (i==0 && (chain->fw_flg & IP_FW_F_SRNG))
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comma = "-";
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else
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comma = ",";
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}
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printf(" to ");
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adrt=ntohl(chain->fw_dmsk.s_addr);
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if (adrt==ULONG_MAX && do_resolv) {
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adrt=(chain->fw_dst.s_addr);
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he=gethostbyaddr((char *)&adrt,sizeof(u_long),AF_INET);
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if (he==NULL) {
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printf(inet_ntoa(chain->fw_dst));
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} else
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printf("%s",he->h_name);
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} else {
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if (adrt!=ULONG_MAX) {
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mb=mask_bits(chain->fw_dmsk);
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if (mb == 0) {
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printf("any");
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} else {
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if (mb > 0) {
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printf(inet_ntoa(chain->fw_dst));
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printf("/%d",mb);
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} else {
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printf(inet_ntoa(chain->fw_dst));
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printf(":");
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printf(inet_ntoa(chain->fw_dmsk));
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}
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}
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} else
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printf(inet_ntoa(chain->fw_dst));
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}
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comma = " ";
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for (i=0;i<chain->fw_ndp;i++) {
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printf("%s%d",comma,chain->fw_pts[chain->fw_nsp+i]);
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if (i==chain->fw_nsp && (chain->fw_flg & IP_FW_F_DRNG))
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comma = "-";
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else
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comma = ",";
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}
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if ((chain->fw_flg & IP_FW_F_IN) && (chain->fw_flg & IP_FW_F_OUT))
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;
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else if (chain->fw_flg & IP_FW_F_IN)
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printf(" in ");
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else if (chain->fw_flg & IP_FW_F_OUT)
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printf(" out ");
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if (chain->fw_flg&IP_FW_F_IFNAME && chain->fw_via_name[0]) {
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char ifnb[FW_IFNLEN+1];
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printf(" via ");
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strncpy(ifnb,chain->fw_via_name,FW_IFNLEN);
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ifnb[FW_IFNLEN]='\0';
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printf("%s%d",ifnb,chain->fw_via_unit);
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} else if (chain->fw_via_ip.s_addr) {
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printf(" via ");
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printf(inet_ntoa(chain->fw_via_ip));
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}
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if (chain->fw_flg & IP_FW_F_FRAG)
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printf("frag ");
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if (chain->fw_ipopt || chain->fw_ipnopt) {
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int _opt_printed = 0;
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#define PRINTOPT(x) {if (_opt_printed) printf(",");\
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printf(x); _opt_printed = 1;}
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printf(" ipopt ");
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if (chain->fw_ipopt & IP_FW_IPOPT_SSRR) PRINTOPT("ssrr");
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if (chain->fw_ipnopt & IP_FW_IPOPT_SSRR) PRINTOPT("!ssrr");
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if (chain->fw_ipopt & IP_FW_IPOPT_LSRR) PRINTOPT("lsrr");
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if (chain->fw_ipnopt & IP_FW_IPOPT_LSRR) PRINTOPT("!lsrr");
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if (chain->fw_ipopt & IP_FW_IPOPT_RR) PRINTOPT("rr");
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if (chain->fw_ipnopt & IP_FW_IPOPT_RR) PRINTOPT("!rr");
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if (chain->fw_ipopt & IP_FW_IPOPT_TS) PRINTOPT("ts");
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if (chain->fw_ipnopt & IP_FW_IPOPT_TS) PRINTOPT("!ts");
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}
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if (chain->fw_tcpf == IP_FW_TCPF_SYN &&
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chain->fw_tcpnf == IP_FW_TCPF_ACK)
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printf(" setup");
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else if (chain->fw_tcpnf == IP_FW_TCPF_SYN && !chain->fw_tcpf)
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printf(" established");
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else if (chain->fw_tcpf || chain->fw_tcpnf) {
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int _flg_printed = 0;
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#define PRINTFLG(x) {if (_flg_printed) printf(",");\
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printf(x); _flg_printed = 1;}
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printf(" tcpflg ");
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if (chain->fw_tcpf & IP_FW_TCPF_FIN) PRINTFLG("fin");
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if (chain->fw_tcpnf & IP_FW_TCPF_FIN) PRINTFLG("!fin");
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if (chain->fw_tcpf & IP_FW_TCPF_SYN) PRINTFLG("syn");
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if (chain->fw_tcpnf & IP_FW_TCPF_SYN) PRINTFLG("!syn");
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if (chain->fw_tcpf & IP_FW_TCPF_RST) PRINTFLG("rst");
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if (chain->fw_tcpnf & IP_FW_TCPF_RST) PRINTFLG("!rst");
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if (chain->fw_tcpf & IP_FW_TCPF_PSH) PRINTFLG("psh");
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if (chain->fw_tcpnf & IP_FW_TCPF_PSH) PRINTFLG("!psh");
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if (chain->fw_tcpf & IP_FW_TCPF_ACK) PRINTFLG("ack");
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if (chain->fw_tcpnf & IP_FW_TCPF_ACK) PRINTFLG("!ack");
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if (chain->fw_tcpf & IP_FW_TCPF_URG) PRINTFLG("urg");
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if (chain->fw_tcpnf & IP_FW_TCPF_URG) PRINTFLG("!urg");
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}
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printf("\n");
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}
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void
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list(ac, av)
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int ac;
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char **av;
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{
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struct ip_fw *r;
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struct ip_fw rules[1024];
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int l,i;
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memset(rules,0,sizeof rules);
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l = sizeof rules;
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i = getsockopt(s, IPPROTO_IP, IP_FW_GET, rules, &l);
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if (i < 0)
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err(2,"getsockopt(IP_FW_GET)");
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printf("FireWall chain entries: %d %d\n",l,i);
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for (r=rules; l >= sizeof rules[0]; r++, l-=sizeof rules[0])
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show_ipfw(r);
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}
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void
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show_usage(str)
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char *str;
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{
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if (str)
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fprintf(stderr,"%s: ERROR - %s\n",progname,str);
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else
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fprintf(stderr,"%s: ERROR - bad arguments\n",progname);
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fprintf(stderr,
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"Usage:\n"
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"\t%s [options]\n"
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"\t\tflush\n"
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"\t\tadd [number] rule\n"
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"\t\tdelete number\n"
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"\t\tlist [number]\n"
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"\t\tzero [number]\n"
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"\trule:\taction proto src dst extras...\n"
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"\t\taction: {allow|deny|reject|count}[,log]\n"
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"\t\tproto: {ip|tcp|udp|icmp}}\n"
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"\t\tsrc: {any|ip[{/bits|:mask}]} [{port|port-port},...]\n"
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"\t\tdst: {any|ip[{/bits|:mask}]} [{port|port-port},...]\n"
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"\textras:\n"
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"\t\tfragment\n"
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"\t\t{in|out|inout}\n"
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"\t\tvia {ifname|ip}\n"
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"\t\ttcpflags [!]{syn|fin|rst|ack|psh},...\n"
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, progname
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);
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fprintf(stderr,"See man %s(8) for proper usage.\n",progname);
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exit (1);
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}
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void
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fill_ip(ipno, mask, acp, avp)
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struct in_addr *ipno, *mask;
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int *acp;
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char ***avp;
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{
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int ac = *acp;
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char **av = *avp;
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char *p = 0, md = 0;
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if (ac && !strncmp(*av,"any",strlen(*av))) {
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ipno->s_addr = mask->s_addr = 0; av++; ac--;
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} else {
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p = strchr(*av, '/');
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if (!p)
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p = strchr(*av, ':');
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if (p) {
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md = *p;
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*p++ = '\0';
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}
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if (!inet_aton(*av,ipno))
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show_usage("ip number\n");
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if (md == ':' && !inet_aton(p,mask))
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show_usage("ip number\n");
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else if (md == '/')
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mask->s_addr = htonl(0xffffffff << (32 - atoi(p)));
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else
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mask->s_addr = htonl(0xffffffff);
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av++;
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ac--;
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}
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*acp = ac;
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*avp = av;
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}
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int
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fill_port(cnt, ptr, off, av)
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u_short *cnt, *ptr, off;
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char **av;
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{
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char *s, sc = 0;
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int i = 0;
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s = strchr(*av,'-');
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if (s) {
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sc = *s;
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*s++ = '\0';
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ptr[off+*cnt] = atoi(*av);
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(*cnt)++;
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*av = s;
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s = strchr(*av,',');
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if (s) {
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sc = *s;
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*s++ = '\0';
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} else
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sc = '\0';
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ptr[off+*cnt] = atoi(*av);
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(*cnt)++;
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if (sc && sc != ',') show_usage("Expected comma\n");
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*av = s;
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sc = 0;
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i = 1;
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}
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while (1) {
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s = strchr(*av,',');
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if (s) {
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sc = *s;
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*s++ = '\0';
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} else
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sc = '\0';
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ptr[off+*cnt] = atoi(*av);
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(*cnt)++;
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if (!sc)
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break;
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if (sc != ',') show_usage("Expected comma\n");
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*av = s;
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}
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return i;
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}
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void
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fill_tcpflag(set, reset, vp)
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u_char *set, *reset;
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char **vp;
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{
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char *p = *vp,*q;
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u_char *d;
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while (p && *p) {
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if (*p == '!') {
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p++;
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d = reset;
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} else {
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d = set;
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}
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q = strchr(p, ',');
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if (q)
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*q++ = '\0';
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if (!strncmp(p,"syn",strlen(p))) *d |= IP_FW_TCPF_SYN;
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if (!strncmp(p,"fin",strlen(p))) *d |= IP_FW_TCPF_FIN;
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if (!strncmp(p,"ack",strlen(p))) *d |= IP_FW_TCPF_ACK;
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if (!strncmp(p,"psh",strlen(p))) *d |= IP_FW_TCPF_PSH;
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if (!strncmp(p,"rst",strlen(p))) *d |= IP_FW_TCPF_RST;
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p = q;
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}
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}
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void
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fill_ipopt(set, reset, vp)
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u_char *set, *reset;
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char **vp;
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{
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char *p = *vp,*q;
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u_char *d;
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while (p && *p) {
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if (*p == '!') {
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p++;
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d = reset;
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} else {
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d = set;
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}
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q = strchr(p, ',');
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if (q)
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*q++ = '\0';
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if (!strncmp(p,"ssrr",strlen(p))) *d |= IP_FW_IPOPT_SSRR;
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if (!strncmp(p,"lsrr",strlen(p))) *d |= IP_FW_IPOPT_LSRR;
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if (!strncmp(p,"rr",strlen(p))) *d |= IP_FW_IPOPT_RR;
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if (!strncmp(p,"ts",strlen(p))) *d |= IP_FW_IPOPT_TS;
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p = q;
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}
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}
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void
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delete(ac,av)
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int ac;
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char **av;
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{
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struct ip_fw rule;
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int i;
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memset(&rule, 0, sizeof rule);
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av++; ac--;
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/* Rule number */
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if (ac && isdigit(**av)) {
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rule.fw_number = atoi(*av); av++; ac--;
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}
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i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, &rule, sizeof rule);
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if (i)
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err(1,"setsockopt(Add)");
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}
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void
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add(ac,av)
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int ac;
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char **av;
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{
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struct ip_fw rule;
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int i;
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memset(&rule, 0, sizeof rule);
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av++; ac--;
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/* Rule number */
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if (ac && isdigit(**av)) {
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rule.fw_number = atoi(*av); av++; ac--;
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}
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/* Action */
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if (ac && !strncmp(*av,"accept",strlen(*av))) {
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rule.fw_flg |= IP_FW_F_ACCEPT; av++; ac--;
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} else if (ac && !strncmp(*av,"pass",strlen(*av))) {
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rule.fw_flg |= IP_FW_F_ACCEPT; av++; ac--;
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} else if (ac && !strncmp(*av,"count",strlen(*av))) {
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rule.fw_flg |= IP_FW_F_COUNT; av++; ac--;
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} else if (ac && !strncmp(*av,"deny",strlen(*av))) {
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av++; ac--;
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} else if (ac && !strncmp(*av,"reject",strlen(*av))) {
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rule.fw_flg |= IP_FW_F_ICMPRPL; av++; ac--;
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} else {
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show_usage("missing action\n");
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}
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/* [log] */
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if (ac && !strncmp(*av,"log",strlen(*av))) {
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rule.fw_flg |= IP_FW_F_PRN; av++; ac--;
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}
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/* protocol */
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if (ac && !strncmp(*av,"ip",strlen(*av))) {
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rule.fw_flg |= IP_FW_F_ALL; av++; ac--;
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} else if (ac && !strncmp(*av,"all",strlen(*av))) {
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rule.fw_flg |= IP_FW_F_ALL; av++; ac--;
|
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} else if (ac && !strncmp(*av,"tcp",strlen(*av))) {
|
|
rule.fw_flg |= IP_FW_F_TCP; av++; ac--;
|
|
} else if (ac && !strncmp(*av,"udp",strlen(*av))) {
|
|
rule.fw_flg |= IP_FW_F_UDP; av++; ac--;
|
|
} else if (ac && !strncmp(*av,"icmp",strlen(*av))) {
|
|
rule.fw_flg |= IP_FW_F_ICMP; av++; ac--;
|
|
} else {
|
|
show_usage("missing protocol\n");
|
|
}
|
|
|
|
/* from */
|
|
if (ac && !strncmp(*av,"from",strlen(*av))) { av++; ac--; }
|
|
else show_usage("missing ``from''\n");
|
|
|
|
fill_ip(&rule.fw_src, &rule.fw_smsk, &ac, &av);
|
|
|
|
if (ac && isdigit(**av)) {
|
|
if (fill_port(&rule.fw_nsp, &rule.fw_pts, 0, av))
|
|
rule.fw_flg |= IP_FW_F_SRNG;
|
|
av++; ac--;
|
|
}
|
|
|
|
/* to */
|
|
if (ac && !strncmp(*av,"to",strlen(*av))) { av++; ac--; }
|
|
else show_usage("missing ``to''\n");
|
|
|
|
if (!ac) show_usage("Missing arguments\n");
|
|
|
|
fill_ip(&rule.fw_dst, &rule.fw_dmsk, &ac, &av);
|
|
|
|
if (ac && isdigit(**av)) {
|
|
if (fill_port(&rule.fw_ndp, &rule.fw_pts, rule.fw_nsp, av))
|
|
rule.fw_flg |= IP_FW_F_DRNG;
|
|
av++; ac--;
|
|
}
|
|
|
|
if (ac && !strncmp(*av,"via",strlen(*av))) {
|
|
av++; ac--;
|
|
if (!isdigit(**av)) {
|
|
char *q;
|
|
|
|
strcpy(rule.fw_via_name, *av);
|
|
for (q = rule.fw_via_name; *q && !isdigit(*q); q++)
|
|
continue;
|
|
rule.fw_via_unit = atoi(q);
|
|
*q = '\0';
|
|
rule.fw_flg |= IP_FW_F_IFNAME;
|
|
} else if (inet_aton(*av,&rule.fw_via_ip) == INADDR_NONE) {
|
|
show_usage("bad IP# after via\n");
|
|
}
|
|
av++; ac--;
|
|
}
|
|
|
|
while (ac) {
|
|
if (!strncmp(*av,"frag",strlen(*av))) {
|
|
rule.fw_flg |= IP_FW_F_FRAG; av++; ac--; continue;
|
|
}
|
|
if (!strncmp(*av,"in",strlen(*av))) {
|
|
rule.fw_flg |= IP_FW_F_IN; av++; ac--; continue;
|
|
}
|
|
if (!strncmp(*av,"out",strlen(*av))) {
|
|
rule.fw_flg |= IP_FW_F_OUT; av++; ac--; continue;
|
|
}
|
|
if (ac > 1 && !strncmp(*av,"ipoptions",strlen(*av))) {
|
|
av++; ac--;
|
|
fill_ipopt(&rule.fw_ipopt, &rule.fw_ipnopt, av);
|
|
av++; ac--; continue;
|
|
}
|
|
if ((rule.fw_flg & IP_FW_F_KIND) == IP_FW_F_TCP) {
|
|
if (!strncmp(*av,"established",strlen(*av))) {
|
|
rule.fw_tcpnf |= IP_FW_TCPF_SYN;
|
|
av++; ac--; continue;
|
|
}
|
|
if (!strncmp(*av,"setup",strlen(*av))) {
|
|
rule.fw_tcpf |= IP_FW_TCPF_SYN;
|
|
rule.fw_tcpnf |= IP_FW_TCPF_ACK;
|
|
av++; ac--; continue;
|
|
}
|
|
if (ac > 1 && !strncmp(*av,"tcpflags",strlen(*av))) {
|
|
av++; ac--;
|
|
fill_tcpflag(&rule.fw_tcpf, &rule.fw_tcpnf, av);
|
|
av++; ac--; continue;
|
|
}
|
|
}
|
|
printf("%d %s\n",ac,*av);
|
|
show_usage("Unknown argument\n");
|
|
}
|
|
|
|
show_ipfw(&rule);
|
|
i = setsockopt(s, IPPROTO_IP, IP_FW_ADD, &rule, sizeof rule);
|
|
if (i)
|
|
err(1,"setsockopt(Delete)");
|
|
}
|
|
|
|
int
|
|
ipfw_main(ac,av)
|
|
int ac;
|
|
char **av;
|
|
{
|
|
|
|
char ch;
|
|
extern int optind;
|
|
|
|
|
|
if ( ac == 1 ) {
|
|
show_usage(NULL);
|
|
}
|
|
|
|
while ((ch = getopt(ac, av ,"aN")) != EOF)
|
|
switch(ch) {
|
|
case 'a':
|
|
do_acct=1;
|
|
break;
|
|
case 'N':
|
|
do_resolv=1;
|
|
break;
|
|
case '?':
|
|
default:
|
|
show_usage(NULL);
|
|
}
|
|
|
|
ac -= optind;
|
|
if (*(av+=optind)==NULL) {
|
|
show_usage(NULL);
|
|
}
|
|
|
|
if (!strncmp(*av, "add", strlen(*av))) {
|
|
add(ac,av);
|
|
} else if (!strncmp(*av, "delete", strlen(*av))) {
|
|
delete(ac,av);
|
|
} else if (!strncmp(*av, "flush", strlen(*av))) {
|
|
if (setsockopt(s,IPPROTO_IP,IP_FW_FLUSH,NULL,0)<0) {
|
|
fprintf(stderr,"%s: setsockopt failed.\n",progname);
|
|
exit(1);
|
|
}
|
|
printf("Flushed all rules.\n");
|
|
} else if (!strncmp(*av, "zero", strlen(*av))) {
|
|
if (setsockopt(s,IPPROTO_IP,IP_FW_ZERO,NULL,0)<0) {
|
|
fprintf(stderr,"%s: setsockopt failed.\n",progname);
|
|
exit(1);
|
|
}
|
|
printf("Accounting cleared.\n");
|
|
} else if (!strncmp(*av, "print", strlen(*av))) {
|
|
list(--ac,++av);
|
|
} else if (!strncmp(*av, "list", strlen(*av))) {
|
|
list(--ac,++av);
|
|
} else {
|
|
show_usage(NULL);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
main(ac, av)
|
|
int ac;
|
|
char **av;
|
|
{
|
|
#define MAX_ARGS 32
|
|
char buf[BUFSIZ];
|
|
char *args[MAX_ARGS];
|
|
char linename[10];
|
|
int i;
|
|
FILE *f;
|
|
|
|
s = socket( AF_INET, SOCK_RAW, IPPROTO_RAW );
|
|
if ( s < 0 ) {
|
|
fprintf(stderr,"%s: Can't open raw socket.\n"
|
|
"Must be root to use this programm. \n",progname);
|
|
exit(1);
|
|
}
|
|
|
|
setbuf(stdout,0);
|
|
|
|
strcpy(progname,*av);
|
|
|
|
if (av[1] && !access(av[1], R_OK)) {
|
|
lineno = 0;
|
|
f = fopen(av[1], "r");
|
|
while (fgets(buf, BUFSIZ, f)) {
|
|
if (buf[strlen(buf)-1]=='\n')
|
|
buf[strlen(buf)-1] = 0;
|
|
|
|
lineno++;
|
|
sprintf(linename, "Line %d", lineno);
|
|
args[0] = linename;
|
|
|
|
args[1] = buf;
|
|
while(*args[1] == ' ')
|
|
args[1]++;
|
|
i = 2;
|
|
while((args[i] = strchr(args[i-1],' '))) {
|
|
*(args[i]++) = 0;
|
|
while(*args[i] == ' ')
|
|
args[i]++;
|
|
i++;
|
|
}
|
|
if (*args[i-1] == 0)
|
|
i--;
|
|
args[i] = NULL;
|
|
|
|
ipfw_main(i, args);
|
|
}
|
|
fclose(f);
|
|
} else
|
|
ipfw_main(ac,av);
|
|
return 0;
|
|
}
|