704 lines
16 KiB
C
704 lines
16 KiB
C
/*
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* Copyright (c) 1993 Daniel Boulet
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* Copyright (c) 1994 Ugen J.S.Antsilevich
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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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/*
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* Implement IP packet firewall
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <net/if.h>
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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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#include <netinet/in_pcb.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/ip_fw.h>
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struct ip_fw *ip_fw_fwd_chain;
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struct ip_fw *ip_fw_blk_chain;
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int ip_fw_policy=1;
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inline
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void
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print_ip(xaddr)
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struct in_addr xaddr;
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{
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u_long addr = ntohl(xaddr.s_addr);
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printf("%d.%d.%d.%d",(addr>>24) & 0xff,
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(addr>>16)&0xff,
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(addr>>8)&0xff,
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addr&0xFF);
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}
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/*
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* Returns 1 if the port is matched by the vector, 0 otherwise
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*/
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inline
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int port_match(portptr,nports,port,range_flag)
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u_short *portptr;
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int nports;
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u_short port;
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int range_flag;
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{
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if ( range_flag ) {
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if ( portptr[0] <= port && port <= portptr[1] ) {
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return( 1 );
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}
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nports -= 2;
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portptr += 2;
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}
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while ( nports-- > 0 ) {
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if ( *portptr++ == port ) {
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return( 1 );
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}
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}
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return(0);
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}
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/*
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* Returns 0 if packet should be dropped, 1 or more if it should be accepted
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*/
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int ip_fw_chk(ip,chain)
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struct ip *ip;
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struct ip_fw *chain;
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{
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struct in_addr src, dst;
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char got_proto = 0;
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int frwl_proto, proto = 0;
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register struct ip_fw *fptr;
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u_short src_port = 0, dst_port = 0;
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#ifdef IPFIREWALL_VERBOSE
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u_short *portptr = (u_short *)&(((u_int *)ip)[ip->ip_hl]);
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#endif
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if ( chain == NULL ) { /* Is there a frwl chain? */
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return(1);
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}
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src = ip->ip_src;
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dst = ip->ip_dst;
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#ifdef DEBUG_IPFIREWALL
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{
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u_short *portptr = (u_short *)&(((u_int *)ip)[ip->ip_hl]);
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printf("packet ");
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switch(ip->ip_p) {
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case IPPROTO_TCP: printf("TCP "); break;
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case IPPROTO_UDP: printf("UDP "); break;
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case IPPROTO_ICMP: printf("ICMP:%d ",((char *)portptr)[0]&0xff); break;
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default: printf("p=%d ",ip->ip_p); break;
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}
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print_ip(ip->ip_src);
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if ( ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP ) {
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printf(":%d ",ntohs(portptr[0]));
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}
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print_ip(ip->ip_dst);
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if ( ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP ) {
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printf(":%d ",ntohs(portptr[1]));
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}
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printf("\n");
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}
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#endif
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for ( fptr = chain; fptr != NULL; fptr = fptr->next ) {
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if ( (src.s_addr & fptr->src_mask.s_addr) == fptr->src.s_addr
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&& (dst.s_addr & fptr->dst_mask.s_addr) == fptr->dst.s_addr ) {
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if ( (frwl_proto = fptr->flags & IP_FW_F_KIND)
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== IP_FW_F_ALL ) {
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/* Universal frwl - we've got a match! */
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#ifdef DEBUG_IPFIREWALL
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printf("universal frwl match\n");
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#endif
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#ifdef IPFIREWALL_VERBOSE
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/*
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* VERY ugly piece of code which actually
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* makes kernel printf for denyed packets...
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* This thingy will be added in more places...
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*/
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if ( !(fptr->flags & IP_FW_F_ACCEPT) &&
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(fptr->flags & IP_FW_F_PRN)) {
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printf("ip_fw_chk says no to ");
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switch(ip->ip_p) {
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case IPPROTO_TCP: printf("TCP "); break;
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case IPPROTO_UDP: printf("UDP "); break;
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case IPPROTO_ICMP: printf("ICMP:%d ",((char *)portptr)[0]&0xff); break;
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default: printf("p=%d ",ip->ip_p); break;
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}
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print_ip(ip->ip_src);
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if ( ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP ) {
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printf(":%d ",ntohs(portptr[0]));
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} else {
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printf("\n");
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}
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print_ip(ip->ip_dst);
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if ( ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP ) {
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printf(":%d ",ntohs(portptr[1]));
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}
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printf("\n");
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return(0);
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}
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#endif
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return( fptr->flags & IP_FW_F_ACCEPT );
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} else {
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/* Specific frwl - packet's protocol must match frwl's */
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if ( !got_proto ) {
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u_short *portptr = (u_short *)&(((u_int *)ip)[ip->ip_hl]);
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switch( ip->ip_p ) {
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case IPPROTO_TCP:
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proto = IP_FW_F_TCP;
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src_port = ntohs(portptr[0]); /* first two shorts in TCP */
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dst_port = ntohs(portptr[1]); /* are src and dst ports */
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break;
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case IPPROTO_UDP:
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proto = IP_FW_F_UDP;
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src_port = ntohs(portptr[0]); /* first two shorts in UDP */
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dst_port = ntohs(portptr[1]); /* are src and dst ports */
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break;
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case IPPROTO_ICMP:
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proto = IP_FW_F_ICMP;
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break;
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default: proto = IP_FW_F_ALL;
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#ifdef DEBUG_IPFIREWALL
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printf("non TCP/UDP packet\n");
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#endif
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}
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got_proto = 1;
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}
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if ( proto == frwl_proto ) {
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if (
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proto == IP_FW_F_ICMP
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||
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(
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(
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fptr->n_src_p == 0
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||
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port_match( &fptr->ports[0],
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fptr->n_src_p,
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src_port,
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fptr->flags & IP_FW_F_SRNG
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)
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)
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&&
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(
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fptr->n_dst_p == 0
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||
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port_match( &fptr->ports[fptr->n_src_p],
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fptr->n_dst_p,
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dst_port,
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fptr->flags & IP_FW_F_DRNG
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)
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)
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)
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) {
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#ifdef IPFIREWALL_VERBOSE
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/*
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* VERY ugly piece of code which actually
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* makes kernel printf for denyed packets...
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* This thingy will be added in more places...
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*/
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if ( !(fptr->flags & IP_FW_F_ACCEPT) &&
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(fptr->flags & IP_FW_F_PRN)) {
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printf("ip_fw_chk says no to ");
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switch(ip->ip_p) {
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case IPPROTO_TCP: printf("TCP "); break;
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case IPPROTO_UDP: printf("UDP "); break;
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case IPPROTO_ICMP: printf("ICMP:%d ",((char *)portptr)[0]&0xff); break;
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default: printf("p=%d ",ip->ip_p); break;
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}
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print_ip(ip->ip_src);
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if ( ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP ) {
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printf(":%d ",ntohs(portptr[0]));
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} else {
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printf("\n");
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}
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print_ip(ip->ip_dst);
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if ( ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP ) {
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printf(":%d ",ntohs(portptr[1]));
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}
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printf("\n");
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return(0);
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}
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#endif
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return( fptr->flags & IP_FW_F_ACCEPT);
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}
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}
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}
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}
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}
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/*
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* If we get here then none of the frwls matched.
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* So now we relay on policy defined by user-unmatched packet can
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* be ever accepted or rejected...
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*/
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#ifdef IPFIREWALL_VERBOSE
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/*
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* VERY ugly piece of code which actually
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* makes kernel printf for denyed packets...
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* This thingy will be added in more places...
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*/
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if ( !(ip_fw_policy) &&
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(fptr->flags & IP_FW_F_PRN)) {
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printf("ip_fw_chk says no to ");
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switch(ip->ip_p) {
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case IPPROTO_TCP: printf("TCP "); break;
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case IPPROTO_UDP: printf("UDP "); break;
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case IPPROTO_ICMP: printf("ICMP:%d ",((char *)portptr)[0]&0xff); break;
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default: printf("p=%d ",ip->ip_p); break;
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}
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print_ip(ip->ip_src);
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if ( ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP ) {
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printf(":%d ",ntohs(portptr[0]));
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} else {
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printf("\n");
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}
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print_ip(ip->ip_dst);
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if ( ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP ) {
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printf(":%d ",ntohs(portptr[1]));
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}
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printf("\n");
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return(0);
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}
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#endif
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return(ip_fw_policy);
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}
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static
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void
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free_fw_chain(chainptr)
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struct ip_fw **chainptr;
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{
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int s=splnet();
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while ( *chainptr != NULL ) {
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struct ip_fw *ftmp;
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ftmp = *chainptr;
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*chainptr = ftmp->next;
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free(ftmp,M_SOOPTS);
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}
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splx(s);
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}
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static
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int
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add_to_chain(chainptr,frwl)
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struct ip_fw **chainptr;
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struct ip_fw *frwl;
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{
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struct ip_fw *ftmp;
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struct ip_fw *chtmp=NULL;
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struct ip_fw *chtmp_prev=NULL;
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int s=splnet();
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u_long m_src_mask,m_dst_mask;
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u_long n_sa,n_da,o_sa,o_da,o_sm,o_dm,n_sm,n_dm;
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u_short n_sr,n_dr,o_sr,o_dr;
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u_short oldkind,newkind;
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int addb4=0;
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int n_o,n_n;
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ftmp = malloc( sizeof(struct ip_fw), M_SOOPTS, M_DONTWAIT );
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if ( ftmp == NULL ) {
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#ifdef DEBUG_IPFIREWALL
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printf("ip_fw_ctl: malloc said no\n");
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#endif
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splx(s);
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return( ENOSPC );
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}
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bcopy( frwl, ftmp, sizeof( struct ip_fw ) );
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ftmp->next = NULL;
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if (*chainptr==NULL)
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{
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*chainptr=ftmp;
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}
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else
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{
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chtmp_prev=NULL;
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for (chtmp=*chainptr;chtmp!=NULL;chtmp=chtmp->next) {
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addb4=0;
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newkind=ftmp->flags & IP_FW_F_KIND;
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oldkind=chtmp->flags & IP_FW_F_KIND;
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if (newkind!=IP_FW_F_ALL
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&& oldkind!=IP_FW_F_ALL
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&& oldkind!=newkind)
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continue;
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/*
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* Very very *UGLY* code...
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* Sorry,but i had to do this....
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*/
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n_sa=ntohl(ftmp->src.s_addr);
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n_da=ntohl(ftmp->dst.s_addr);
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n_sm=ntohl(ftmp->src_mask.s_addr);
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n_dm=ntohl(ftmp->dst_mask.s_addr);
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o_sa=ntohl(chtmp->src.s_addr);
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o_da=ntohl(chtmp->dst.s_addr);
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o_sm=ntohl(chtmp->src_mask.s_addr);
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o_dm=ntohl(chtmp->dst_mask.s_addr);
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m_src_mask = o_sm & n_sm;
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m_dst_mask = o_dm & n_dm;
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if ((o_sa & m_src_mask) == (n_sa & m_src_mask)) {
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if (n_sm > o_sm)
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addb4++;
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if (n_sm < o_sm)
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addb4--;
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}
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if ((o_da & m_dst_mask) == (n_da & m_dst_mask)) {
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if (n_dm > o_dm)
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addb4++;
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if (n_dm < o_dm)
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addb4--;
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}
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if (((o_da & o_dm) == (n_da & n_dm))
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&&((o_sa & o_sm) == (n_sa & n_sm)))
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{
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if (newkind!=IP_FW_F_ALL &&
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oldkind==IP_FW_F_ALL)
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addb4++;
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if (newkind==oldkind && (oldkind==IP_FW_F_TCP
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|| oldkind==IP_FW_F_UDP)) {
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/*
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* Here the main ide is to check the size
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* of port range which the frwl covers
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* We actually don't check their values but
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* just the wideness of range they have
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* so that less wide ranges or single ports
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* go first and wide ranges go later. No ports
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* at all treated as a range of maximum number
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* of ports.
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*/
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if (ftmp->flags & IP_FW_F_SRNG)
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n_sr=ftmp->ports[1]-ftmp->ports[0];
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else
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n_sr=(ftmp->n_src_p)?
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ftmp->n_src_p : USHRT_MAX;
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if (chtmp->flags & IP_FW_F_SRNG)
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o_sr=chtmp->ports[1]-chtmp->ports[0];
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else
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o_sr=(chtmp->n_src_p)?
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chtmp->n_src_p : USHRT_MAX;
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if (n_sr<o_sr)
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addb4++;
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if (n_sr>o_sr)
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addb4--;
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n_n=ftmp->n_src_p;
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n_o=chtmp->n_src_p;
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/*
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* Actually this cannot happen as the frwl control
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* procedure checks for number of ports in source and
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* destination range but we will try to be more safe.
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*/
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if ((n_n>(IP_FW_MAX_PORTS-2)) ||
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(n_o>(IP_FW_MAX_PORTS-2)))
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goto skip_check;
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if (ftmp->flags & IP_FW_F_DRNG)
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n_dr=ftmp->ports[n_n+1]-ftmp->ports[n_n];
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else
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n_dr=(ftmp->n_dst_p)?
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ftmp->n_dst_p : USHRT_MAX;
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if (chtmp->flags & IP_FW_F_DRNG)
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o_dr=chtmp->ports[n_o+1]-chtmp->ports[n_o];
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else
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o_dr=(chtmp->n_dst_p)?
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chtmp->n_dst_p : USHRT_MAX;
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if (n_dr<o_dr)
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addb4++;
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if (n_dr>o_dr)
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addb4--;
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skip_check:
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}
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}
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if (addb4>0) {
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if (chtmp_prev) {
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chtmp_prev->next=ftmp;
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ftmp->next=chtmp;
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} else {
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*chainptr=ftmp;
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ftmp->next=chtmp;
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}
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splx(s);
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return 0;
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}
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chtmp_prev=chtmp;
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}
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if (chtmp_prev)
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chtmp_prev->next=ftmp;
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else
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#define wrong
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#ifdef wrong
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*chainptr=ftmp;
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#else
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panic("Can't happen");
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#endif
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#undef wrong
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}
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splx(s);
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return(0);
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}
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static
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int
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del_from_chain(chainptr,frwl)
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struct ip_fw **chainptr;
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struct ip_fw *frwl;
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{
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struct ip_fw *ftmp,*ltmp;
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u_short tport1,tport2,tmpnum;
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char matches,was_found;
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int s=splnet();
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ftmp=*chainptr;
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if ( ftmp == NULL ) {
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#ifdef DEBUG_IPFIREWALL
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printf("ip_fw_ctl: chain is empty\n");
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#endif
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splx(s);
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return( EINVAL );
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}
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ltmp=NULL;
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was_found=0;
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while( ftmp != NULL )
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{
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matches=1;
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if ((bcmp(&ftmp->src,&frwl->src,sizeof(struct in_addr)))
|
|
|| (bcmp(&ftmp->src_mask,&frwl->src_mask,sizeof(struct in_addr)))
|
|
|| (bcmp(&ftmp->dst,&frwl->dst,sizeof(struct in_addr)))
|
|
|| (bcmp(&ftmp->dst_mask,&frwl->dst_mask,sizeof(struct in_addr)))
|
|
|| (ftmp->flags!=frwl->flags))
|
|
matches=0;
|
|
tport1=ftmp->n_src_p+ftmp->n_dst_p;
|
|
tport2=frwl->n_src_p+frwl->n_dst_p;
|
|
if (tport1!=tport2)
|
|
matches=0;
|
|
else
|
|
if (tport1!=0)
|
|
{
|
|
for (tmpnum=0;tmpnum < tport1 && tmpnum < IP_FW_MAX_PORTS;tmpnum++)
|
|
if (ftmp->ports[tmpnum]!=frwl->ports[tmpnum])
|
|
matches=0;
|
|
}
|
|
if(matches)
|
|
{
|
|
was_found=1;
|
|
if (ltmp)
|
|
{
|
|
ltmp->next=ftmp->next;
|
|
free(ftmp,M_SOOPTS);
|
|
ftmp=ltmp->next;
|
|
}
|
|
else
|
|
{
|
|
*chainptr=ftmp->next;
|
|
free(ftmp,M_SOOPTS);
|
|
ftmp=*chainptr;
|
|
}
|
|
|
|
}
|
|
else
|
|
{
|
|
ltmp = ftmp;
|
|
ftmp = ftmp->next;
|
|
}
|
|
}
|
|
splx(s);
|
|
if (was_found) return 0;
|
|
else return(EINVAL);
|
|
}
|
|
|
|
int
|
|
ip_fw_ctl(stage,m)
|
|
int stage;
|
|
struct mbuf *m;
|
|
{
|
|
int *tmp_policy_ptr;
|
|
if ( stage == IP_FW_FLUSH )
|
|
{
|
|
free_fw_chain(&ip_fw_blk_chain);
|
|
free_fw_chain(&ip_fw_fwd_chain);
|
|
return(0);
|
|
}
|
|
|
|
if ( m == 0 )
|
|
{
|
|
printf("ip_fw_ctl: NULL mbuf ptr\n");
|
|
return( EINVAL );
|
|
}
|
|
|
|
if ( stage == IP_FW_POLICY )
|
|
{
|
|
tmp_policy_ptr=mtod(m,int *);
|
|
if ((*tmp_policy_ptr)!=1 && (*tmp_policy_ptr)!=0)
|
|
return ( EINVAL );
|
|
ip_fw_policy=*tmp_policy_ptr;
|
|
return 0;
|
|
}
|
|
|
|
if ( stage == IP_FW_CHK_BLK || stage == IP_FW_CHK_FWD ) {
|
|
|
|
struct ip *ip;
|
|
if ( m->m_len < sizeof(struct ip) + 2 * sizeof(u_short) ) {
|
|
#ifdef DEBUG_IPFIREWALL
|
|
printf("ip_fw_ctl: mbuf len=%d, want at least %d\n",m->m_len,sizeof(struct ip) + 2 * sizeof(u_short));
|
|
#endif
|
|
return( EINVAL );
|
|
}
|
|
ip = mtod(m,struct ip *);
|
|
if ( ip->ip_hl != sizeof(struct ip) / sizeof(int) ) {
|
|
#ifdef DEBUG_IPFIREWALL
|
|
printf("ip_fw_ctl: ip->ip_hl=%d, want %d\n",ip->ip_hl,sizeof(struct ip)/sizeof(int));
|
|
#endif
|
|
return( EINVAL );
|
|
}
|
|
if ( ip_fw_chk(ip,
|
|
stage == IP_FW_CHK_BLK ?
|
|
ip_fw_blk_chain : ip_fw_fwd_chain )
|
|
)
|
|
return(0);
|
|
else {
|
|
return(EACCES);
|
|
}
|
|
|
|
} else if ( stage == IP_FW_ADD_BLK
|
|
|| stage == IP_FW_ADD_FWD
|
|
|| stage == IP_FW_DEL_BLK
|
|
|| stage == IP_FW_DEL_FWD
|
|
) {
|
|
|
|
struct ip_fw *frwl;
|
|
|
|
if ( m->m_len != sizeof(struct ip_fw) ) {
|
|
#ifdef DEBUG_IPFIREWALL
|
|
printf("ip_fw_ctl: len=%d, want %d\n",m->m_len,sizeof(struct ip_fw));
|
|
#endif
|
|
return( EINVAL );
|
|
}
|
|
|
|
frwl = mtod(m,struct ip_fw*);
|
|
if ( (frwl->flags & ~IP_FW_F_MASK) != 0 ) {
|
|
#ifdef DEBUG_IPFIREWALL
|
|
printf("ip_fw_ctl: undefined flag bits set (flags=%x)\n",frwl->flags);
|
|
#endif
|
|
return( EINVAL );
|
|
}
|
|
|
|
if ( (frwl->flags & IP_FW_F_SRNG) && frwl->n_src_p < 2 ) {
|
|
#ifdef DEBUG_IPFIREWALL
|
|
printf("ip_fw_ctl: src range set but n_src_p=%d\n",frwl->n_src_p);
|
|
#endif
|
|
return( EINVAL );
|
|
}
|
|
|
|
if ( (frwl->flags & IP_FW_F_DRNG) && frwl->n_dst_p < 2 ) {
|
|
#ifdef DEBUG_IPFIREWALL
|
|
printf("ip_fw_ctl: dst range set but n_dst_p=%d\n",frwl->n_dst_p);
|
|
#endif
|
|
return( EINVAL );
|
|
}
|
|
|
|
if ( frwl->n_src_p + frwl->n_dst_p > IP_FW_MAX_PORTS ) {
|
|
#ifdef DEBUG_IPFIREWALL
|
|
printf("ip_fw_ctl: too many ports (%d+%d)\n",frwl->n_src_p,frwl->n_dst_p);
|
|
#endif
|
|
return( EINVAL );
|
|
}
|
|
|
|
#if 0
|
|
if ( (frwl->flags & IP_FW_F_KIND) == IP_FW_F_ICMP ) {
|
|
#ifdef DEBUG_IPFIREWALL
|
|
printf("ip_fw_ctl: request for unsupported ICMP frwling\n");
|
|
#endif
|
|
return( EINVAL );
|
|
}
|
|
|
|
#endif
|
|
if ( stage == IP_FW_ADD_BLK )
|
|
{
|
|
return( add_to_chain(&ip_fw_blk_chain,frwl));
|
|
}
|
|
if ( stage == IP_FW_ADD_FWD )
|
|
{
|
|
return( add_to_chain(&ip_fw_fwd_chain,frwl));
|
|
}
|
|
if ( stage == IP_FW_DEL_BLK )
|
|
{
|
|
return( del_from_chain(&ip_fw_blk_chain,frwl));
|
|
}
|
|
if ( stage == IP_FW_DEL_FWD )
|
|
{
|
|
return( del_from_chain(&ip_fw_fwd_chain,frwl));
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG_IPFIREWALL
|
|
printf("ip_fw_ctl: unknown request %d\n",stage);
|
|
#endif
|
|
return(EINVAL);
|
|
|
|
}
|