1242 lines
27 KiB
C
1242 lines
27 KiB
C
/*
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* Copyright (C) 1993-2000 by Darren Reed.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and due credit is given
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* to the original author and the contributors.
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*/
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#include <sys/types.h>
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#if !defined(__SVR4) && !defined(__svr4__)
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#include <strings.h>
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#else
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#include <sys/byteorder.h>
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.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/tcp.h>
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#include <net/if.h>
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#if __FreeBSD_version >= 300000
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# include <net/if_var.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stddef.h>
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#include <netdb.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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#include <resolv.h>
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#include <ctype.h>
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#include <syslog.h>
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#include "ip_compat.h"
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#include "ip_fil.h"
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#include "ipf.h"
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#include "facpri.h"
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#if !defined(lint)
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static const char sccsid[] = "@(#)parse.c 1.44 6/5/96 (C) 1993-2000 Darren Reed";
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static const char rcsid[] = "@(#)$IPFilter: parse.c,v 2.8 1999/12/28 10:49:46 darrenr Exp $";
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#endif
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extern struct ipopt_names ionames[], secclass[];
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extern int opts;
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#ifdef USE_INET6
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extern int use_inet6;
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#endif
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int addicmp __P((char ***, struct frentry *, int));
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int extras __P((char ***, struct frentry *, int));
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int icmpcode __P((char *)), addkeep __P((char ***, struct frentry *, int));
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int to_interface __P((frdest_t *, char *, int));
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void print_toif __P((char *, frdest_t *));
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void optprint __P((u_short *, u_long, u_long));
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int loglevel __P((char **, u_int *, int));
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void printlog __P((frentry_t *));
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extern char *proto;
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extern char flagset[];
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extern u_char flags[];
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/* parse()
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*
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* parse a line read from the input filter rule file
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*/
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struct frentry *parse(line, linenum)
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char *line;
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int linenum;
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{
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static struct frentry fil;
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struct protoent *p = NULL;
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char *cps[31], **cpp, *endptr;
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int i, cnt = 1, j, ch;
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u_int k;
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while (*line && isspace(*line))
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line++;
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if (!*line)
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return NULL;
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bzero((char *)&fil, sizeof(fil));
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fil.fr_mip.fi_v = 0xf;
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#ifdef USE_INET6
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fil.fr_ip.fi_v = use_inet6 ? 6 : 4;
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#else
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fil.fr_ip.fi_v = 4;
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#endif
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fil.fr_loglevel = 0xffff;
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/*
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* break line up into max of 20 segments
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*/
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if (opts & OPT_DEBUG)
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fprintf(stderr, "parse [%s]\n", line);
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for (i = 0, *cps = strtok(line, " \b\t\r\n"); cps[i] && i < 30; cnt++)
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cps[++i] = strtok(NULL, " \b\t\r\n");
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cps[i] = NULL;
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if (cnt < 3) {
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fprintf(stderr, "%d: not enough segments in line\n", linenum);
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return NULL;
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}
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cpp = cps;
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if (**cpp == '@')
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fil.fr_hits = (U_QUAD_T)atoi(*cpp++ + 1) + 1;
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if (!strcasecmp("block", *cpp)) {
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fil.fr_flags |= FR_BLOCK;
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if (!strncasecmp(*(cpp+1), "return-icmp-as-dest", 19) &&
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(i = 19))
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fil.fr_flags |= FR_FAKEICMP;
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else if (!strncasecmp(*(cpp+1), "return-icmp", 11) && (i = 11))
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fil.fr_flags |= FR_RETICMP;
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if (fil.fr_flags & FR_RETICMP) {
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cpp++;
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if (strlen(*cpp) == i) {
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if (*(cpp + 1) && **(cpp +1) == '(') {
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cpp++;
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i = 0;
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} else
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i = -1;
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}
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/*
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* The ICMP code is not required to follow in ()'s
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*/
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if ((i >= 0) && (*(*cpp + i) == '(')) {
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i++;
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j = icmpcode(*cpp + i);
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if (j == -1) {
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fprintf(stderr,
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"%d: unrecognised icmp code %s\n",
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linenum, *cpp + 20);
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return NULL;
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}
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fil.fr_icode = j;
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}
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} else if (!strncasecmp(*(cpp+1), "return-rst", 10)) {
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fil.fr_flags |= FR_RETRST;
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cpp++;
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}
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} else if (!strcasecmp("count", *cpp)) {
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fil.fr_flags |= FR_ACCOUNT;
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} else if (!strcasecmp("pass", *cpp)) {
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fil.fr_flags |= FR_PASS;
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} else if (!strcasecmp("auth", *cpp)) {
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fil.fr_flags |= FR_AUTH;
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} else if (!strcasecmp("preauth", *cpp)) {
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fil.fr_flags |= FR_PREAUTH;
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} else if (!strcasecmp("skip", *cpp)) {
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cpp++;
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if (ratoui(*cpp, &k, 0, UINT_MAX))
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fil.fr_skip = k;
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else {
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fprintf(stderr, "%d: integer must follow skip\n",
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linenum);
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return NULL;
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}
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} else if (!strcasecmp("log", *cpp)) {
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fil.fr_flags |= FR_LOG;
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if (!strcasecmp(*(cpp+1), "body")) {
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fil.fr_flags |= FR_LOGBODY;
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cpp++;
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}
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if (!strcasecmp(*(cpp+1), "first")) {
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fil.fr_flags |= FR_LOGFIRST;
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cpp++;
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}
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if (*cpp && !strcasecmp(*(cpp+1), "or-block")) {
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fil.fr_flags |= FR_LOGORBLOCK;
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cpp++;
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}
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if (!strcasecmp(*(cpp+1), "level")) {
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cpp++;
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if (loglevel(cpp, &fil.fr_loglevel, linenum) == -1)
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return NULL;
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cpp++;
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}
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} else {
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/*
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* Doesn't start with one of the action words
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*/
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fprintf(stderr, "%d: unknown keyword (%s)\n", linenum, *cpp);
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return NULL;
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}
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if (!*++cpp) {
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fprintf(stderr, "%d: missing 'in'/'out' keyword\n", linenum);
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return NULL;
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}
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if (!strcasecmp("in", *cpp))
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fil.fr_flags |= FR_INQUE;
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else if (!strcasecmp("out", *cpp)) {
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fil.fr_flags |= FR_OUTQUE;
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if (fil.fr_flags & FR_RETICMP) {
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fprintf(stderr,
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"%d: Can only use return-icmp with 'in'\n",
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linenum);
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return NULL;
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} else if (fil.fr_flags & FR_RETRST) {
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fprintf(stderr,
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"%d: Can only use return-rst with 'in'\n",
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linenum);
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return NULL;
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}
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}
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if (!*++cpp) {
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fprintf(stderr, "%d: missing source specification\n", linenum);
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return NULL;
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}
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if (!strcasecmp("log", *cpp)) {
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if (!*++cpp) {
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fprintf(stderr, "%d: missing source specification\n",
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linenum);
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return NULL;
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}
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if (fil.fr_flags & FR_PASS)
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fil.fr_flags |= FR_LOGP;
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else if (fil.fr_flags & FR_BLOCK)
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fil.fr_flags |= FR_LOGB;
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if (*cpp && !strcasecmp(*cpp, "body")) {
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fil.fr_flags |= FR_LOGBODY;
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cpp++;
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}
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if (*cpp && !strcasecmp(*cpp, "first")) {
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fil.fr_flags |= FR_LOGFIRST;
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cpp++;
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}
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if (*cpp && !strcasecmp(*cpp, "or-block")) {
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if (!(fil.fr_flags & FR_PASS)) {
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fprintf(stderr,
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"%d: or-block must be used with pass\n",
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linenum);
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return NULL;
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}
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fil.fr_flags |= FR_LOGORBLOCK;
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cpp++;
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}
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if (*cpp && !strcasecmp(*cpp, "level")) {
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if (loglevel(cpp, &fil.fr_loglevel, linenum) == -1)
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return NULL;
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cpp++;
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cpp++;
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}
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}
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if (*cpp && !strcasecmp("quick", *cpp)) {
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cpp++;
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fil.fr_flags |= FR_QUICK;
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}
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*fil.fr_ifname = '\0';
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if (*cpp && !strcasecmp(*cpp, "on")) {
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if (!*++cpp) {
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fprintf(stderr, "%d: interface name missing\n",
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linenum);
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return NULL;
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}
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(void)strncpy(fil.fr_ifname, *cpp, IFNAMSIZ-1);
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fil.fr_ifname[IFNAMSIZ-1] = '\0';
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cpp++;
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if (!*cpp) {
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if ((fil.fr_flags & FR_RETMASK) == FR_RETRST) {
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fprintf(stderr,
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"%d: %s can only be used with TCP\n",
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linenum, "return-rst");
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return NULL;
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}
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return &fil;
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}
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if (*cpp) {
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if (!strcasecmp(*cpp, "dup-to") && *(cpp + 1)) {
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cpp++;
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if (to_interface(&fil.fr_dif, *cpp, linenum))
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return NULL;
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cpp++;
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}
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if (*cpp && !strcasecmp(*cpp, "to") && *(cpp + 1)) {
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cpp++;
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if (to_interface(&fil.fr_tif, *cpp, linenum))
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return NULL;
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cpp++;
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} else if (*cpp && !strcasecmp(*cpp, "fastroute")) {
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if (!(fil.fr_flags & FR_INQUE)) {
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fprintf(stderr,
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"can only use %s with 'in'\n",
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"fastroute");
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return NULL;
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}
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fil.fr_flags |= FR_FASTROUTE;
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cpp++;
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}
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}
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}
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if (*cpp && !strcasecmp(*cpp, "tos")) {
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if (!*++cpp) {
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fprintf(stderr, "%d: tos missing value\n", linenum);
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return NULL;
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}
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fil.fr_tos = strtol(*cpp, NULL, 0);
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fil.fr_mip.fi_tos = 0xff;
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cpp++;
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}
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if (*cpp && !strcasecmp(*cpp, "ttl")) {
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if (!*++cpp) {
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fprintf(stderr, "%d: ttl missing hopcount value\n",
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linenum);
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return NULL;
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}
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if (ratoi(*cpp, &i, 0, 255))
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fil.fr_ttl = i;
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else {
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fprintf(stderr, "%d: invalid ttl (%s)\n",
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linenum, *cpp);
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return NULL;
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}
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fil.fr_mip.fi_ttl = 0xff;
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cpp++;
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}
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/*
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* check for "proto <protoname>" only decode udp/tcp/icmp as protoname
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*/
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proto = NULL;
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if (*cpp && !strcasecmp(*cpp, "proto")) {
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if (!*++cpp) {
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fprintf(stderr, "%d: protocol name missing\n", linenum);
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return NULL;
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}
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proto = *cpp++;
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if (!strcasecmp(proto, "tcp/udp")) {
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fil.fr_ip.fi_fl |= FI_TCPUDP;
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fil.fr_mip.fi_fl |= FI_TCPUDP;
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} else {
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if (!(p = getprotobyname(proto)) && !isdigit(*proto)) {
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fprintf(stderr,
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"%d: unknown protocol (%s)\n",
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linenum, proto);
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return NULL;
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}
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if (p)
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fil.fr_proto = p->p_proto;
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else if (isdigit(*proto)) {
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i = (int)strtol(proto, &endptr, 0);
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if (*endptr != '\0' || i < 0 || i > 255) {
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fprintf(stderr,
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"%d: unknown protocol (%s)\n",
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linenum, proto);
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return NULL;
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}
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fil.fr_proto = i;
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}
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fil.fr_mip.fi_p = 0xff;
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}
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}
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if ((fil.fr_proto != IPPROTO_TCP) &&
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((fil.fr_flags & FR_RETMASK) == FR_RETRST)) {
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fprintf(stderr, "%d: %s can only be used with TCP\n",
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linenum, "return-rst");
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return NULL;
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}
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/*
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* get the from host and bit mask to use against packets
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*/
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if (!*cpp) {
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fprintf(stderr, "%d: missing source specification\n", linenum);
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return NULL;
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}
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if (!strcasecmp(*cpp, "all")) {
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cpp++;
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if (!*cpp)
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return &fil;
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} else {
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if (strcasecmp(*cpp, "from")) {
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fprintf(stderr, "%d: unexpected keyword (%s) - from\n",
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linenum, *cpp);
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return NULL;
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}
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if (!*++cpp) {
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fprintf(stderr, "%d: missing host after from\n",
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linenum);
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return NULL;
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}
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if (**cpp == '!') {
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fil.fr_flags |= FR_NOTSRCIP;
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(*cpp)++;
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}
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ch = 0;
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if (hostmask(&cpp, (u_32_t *)&fil.fr_src,
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(u_32_t *)&fil.fr_smsk, &fil.fr_sport, &ch,
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&fil.fr_stop, linenum)) {
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return NULL;
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}
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fil.fr_scmp = ch;
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if (!*cpp) {
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fprintf(stderr, "%d: missing to fields\n", linenum);
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return NULL;
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}
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/*
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* do the same for the to field (destination host)
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*/
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if (strcasecmp(*cpp, "to")) {
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fprintf(stderr, "%d: unexpected keyword (%s) - to\n",
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linenum, *cpp);
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return NULL;
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}
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if (!*++cpp) {
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fprintf(stderr, "%d: missing host after to\n", linenum);
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return NULL;
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}
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ch = 0;
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if (**cpp == '!') {
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fil.fr_flags |= FR_NOTDSTIP;
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(*cpp)++;
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}
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if (hostmask(&cpp, (u_32_t *)&fil.fr_dst,
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(u_32_t *)&fil.fr_dmsk, &fil.fr_dport, &ch,
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&fil.fr_dtop, linenum)) {
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return NULL;
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}
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fil.fr_dcmp = ch;
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}
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/*
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* check some sanity, make sure we don't have icmp checks with tcp
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* or udp or visa versa.
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*/
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if (fil.fr_proto && (fil.fr_dcmp || fil.fr_scmp) &&
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fil.fr_proto != IPPROTO_TCP && fil.fr_proto != IPPROTO_UDP) {
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fprintf(stderr, "%d: port operation on non tcp/udp\n", linenum);
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return NULL;
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}
|
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if (fil.fr_icmp && fil.fr_proto != IPPROTO_ICMP) {
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fprintf(stderr, "%d: icmp comparisons on wrong protocol\n",
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linenum);
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return NULL;
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}
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if (!*cpp)
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return &fil;
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|
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if (*cpp && !strcasecmp(*cpp, "flags")) {
|
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if (!*++cpp) {
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fprintf(stderr, "%d: no flags present\n", linenum);
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return NULL;
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}
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fil.fr_tcpf = tcp_flags(*cpp, &fil.fr_tcpfm, linenum);
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cpp++;
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}
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|
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/*
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* extras...
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*/
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if ((fil.fr_v == 4) && *cpp && (!strcasecmp(*cpp, "with") ||
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!strcasecmp(*cpp, "and")))
|
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if (extras(&cpp, &fil, linenum))
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return NULL;
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|
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/*
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* icmp types for use with the icmp protocol
|
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*/
|
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if (*cpp && !strcasecmp(*cpp, "icmp-type")) {
|
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if (fil.fr_proto != IPPROTO_ICMP) {
|
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fprintf(stderr,
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"%d: icmp with wrong protocol (%d)\n",
|
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linenum, fil.fr_proto);
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return NULL;
|
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}
|
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if (addicmp(&cpp, &fil, linenum))
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return NULL;
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fil.fr_icmp = htons(fil.fr_icmp);
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fil.fr_icmpm = htons(fil.fr_icmpm);
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}
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|
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/*
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* Keep something...
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*/
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while (*cpp && !strcasecmp(*cpp, "keep"))
|
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if (addkeep(&cpp, &fil, linenum))
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return NULL;
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|
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/*
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* head of a new group ?
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*/
|
|
if (*cpp && !strcasecmp(*cpp, "head")) {
|
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if (!*++cpp) {
|
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fprintf(stderr, "%d: head without group #\n", linenum);
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return NULL;
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}
|
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if (ratoui(*cpp, &k, 0, UINT_MAX))
|
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fil.fr_grhead = (u_32_t)k;
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else {
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fprintf(stderr, "%d: invalid group (%s)\n",
|
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linenum, *cpp);
|
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return NULL;
|
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}
|
|
cpp++;
|
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}
|
|
|
|
/*
|
|
* head of a new group ?
|
|
*/
|
|
if (*cpp && !strcasecmp(*cpp, "group")) {
|
|
if (!*++cpp) {
|
|
fprintf(stderr, "%d: group without group #\n",
|
|
linenum);
|
|
return NULL;
|
|
}
|
|
if (ratoui(*cpp, &k, 0, UINT_MAX))
|
|
fil.fr_group = k;
|
|
else {
|
|
fprintf(stderr, "%d: invalid group (%s)\n",
|
|
linenum, *cpp);
|
|
return NULL;
|
|
}
|
|
cpp++;
|
|
}
|
|
|
|
/*
|
|
* leftovers...yuck
|
|
*/
|
|
if (*cpp && **cpp) {
|
|
fprintf(stderr, "%d: unknown words at end: [", linenum);
|
|
for (; *cpp; cpp++)
|
|
fprintf(stderr, "%s ", *cpp);
|
|
fprintf(stderr, "]\n");
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* lazy users...
|
|
*/
|
|
if ((fil.fr_tcpf || fil.fr_tcpfm) && fil.fr_proto != IPPROTO_TCP) {
|
|
fprintf(stderr, "%d: TCP protocol not specified\n", linenum);
|
|
return NULL;
|
|
}
|
|
if (!(fil.fr_ip.fi_fl & FI_TCPUDP) && (fil.fr_proto != IPPROTO_TCP) &&
|
|
(fil.fr_proto != IPPROTO_UDP) && (fil.fr_dcmp || fil.fr_scmp)) {
|
|
if (!fil.fr_proto) {
|
|
fil.fr_ip.fi_fl |= FI_TCPUDP;
|
|
fil.fr_mip.fi_fl |= FI_TCPUDP;
|
|
} else {
|
|
fprintf(stderr,
|
|
"%d: port comparisons for non-TCP/UDP\n",
|
|
linenum);
|
|
return NULL;
|
|
}
|
|
}
|
|
/*
|
|
if ((fil.fr_flags & FR_KEEPFRAG) &&
|
|
(!(fil.fr_ip.fi_fl & FI_FRAG) || !(fil.fr_ip.fi_fl & FI_FRAG))) {
|
|
fprintf(stderr,
|
|
"%d: must use 'with frags' with 'keep frags'\n",
|
|
linenum);
|
|
return NULL;
|
|
}
|
|
*/
|
|
return &fil;
|
|
}
|
|
|
|
|
|
int loglevel(cpp, facpri, linenum)
|
|
char **cpp;
|
|
u_int *facpri;
|
|
int linenum;
|
|
{
|
|
int fac, pri;
|
|
char *s;
|
|
|
|
fac = 0;
|
|
pri = 0;
|
|
if (!*++cpp) {
|
|
fprintf(stderr, "%d: %s\n", linenum,
|
|
"missing identifier after level");
|
|
return -1;
|
|
}
|
|
|
|
s = index(*cpp, '.');
|
|
if (s) {
|
|
*s++ = '\0';
|
|
fac = fac_findname(*cpp);
|
|
if (fac == -1) {
|
|
fprintf(stderr, "%d: %s %s\n", linenum,
|
|
"Unknown facility", *cpp);
|
|
return -1;
|
|
}
|
|
pri = pri_findname(s);
|
|
if (pri == -1) {
|
|
fprintf(stderr, "%d: %s %s\n", linenum,
|
|
"Unknown priority", s);
|
|
return -1;
|
|
}
|
|
} else {
|
|
pri = pri_findname(*cpp);
|
|
if (pri == -1) {
|
|
fprintf(stderr, "%d: %s %s\n", linenum,
|
|
"Unknown priority", *cpp);
|
|
return -1;
|
|
}
|
|
}
|
|
*facpri = fac|pri;
|
|
return 0;
|
|
}
|
|
|
|
|
|
int to_interface(fdp, to, linenum)
|
|
frdest_t *fdp;
|
|
char *to;
|
|
int linenum;
|
|
{
|
|
char *s;
|
|
|
|
s = index(to, ':');
|
|
fdp->fd_ifp = NULL;
|
|
if (s) {
|
|
*s++ = '\0';
|
|
if (hostnum((u_32_t *)&fdp->fd_ip, s, linenum) == -1)
|
|
return -1;
|
|
}
|
|
(void) strncpy(fdp->fd_ifname, to, sizeof(fdp->fd_ifname) - 1);
|
|
fdp->fd_ifname[sizeof(fdp->fd_ifname) - 1] = '\0';
|
|
return 0;
|
|
}
|
|
|
|
|
|
void print_toif(tag, fdp)
|
|
char *tag;
|
|
frdest_t *fdp;
|
|
{
|
|
printf("%s %s%s", tag, fdp->fd_ifname,
|
|
(fdp->fd_ifp || (long)fdp->fd_ifp == -1) ? "" : "(!)");
|
|
if (fdp->fd_ip.s_addr)
|
|
printf(":%s", inet_ntoa(fdp->fd_ip));
|
|
putchar(' ');
|
|
}
|
|
|
|
|
|
/*
|
|
* deal with extra bits on end of the line
|
|
*/
|
|
int extras(cp, fr, linenum)
|
|
char ***cp;
|
|
struct frentry *fr;
|
|
int linenum;
|
|
{
|
|
u_short secmsk;
|
|
u_long opts;
|
|
int notopt;
|
|
char oflags;
|
|
|
|
opts = 0;
|
|
secmsk = 0;
|
|
notopt = 0;
|
|
(*cp)++;
|
|
if (!**cp)
|
|
return -1;
|
|
|
|
while (**cp && (!strncasecmp(**cp, "ipopt", 5) ||
|
|
!strncasecmp(**cp, "not", 3) || !strncasecmp(**cp, "opt", 3) ||
|
|
!strncasecmp(**cp, "frag", 4) || !strncasecmp(**cp, "no", 2) ||
|
|
!strncasecmp(**cp, "short", 5))) {
|
|
if (***cp == 'n' || ***cp == 'N') {
|
|
notopt = 1;
|
|
(*cp)++;
|
|
continue;
|
|
} else if (***cp == 'i' || ***cp == 'I') {
|
|
if (!notopt)
|
|
fr->fr_ip.fi_fl |= FI_OPTIONS;
|
|
fr->fr_mip.fi_fl |= FI_OPTIONS;
|
|
goto nextopt;
|
|
} else if (***cp == 'f' || ***cp == 'F') {
|
|
if (!notopt)
|
|
fr->fr_ip.fi_fl |= FI_FRAG;
|
|
fr->fr_mip.fi_fl |= FI_FRAG;
|
|
goto nextopt;
|
|
} else if (***cp == 'o' || ***cp == 'O') {
|
|
if (!*(*cp + 1)) {
|
|
fprintf(stderr,
|
|
"%d: opt missing arguements\n",
|
|
linenum);
|
|
return -1;
|
|
}
|
|
(*cp)++;
|
|
if (!(opts = optname(cp, &secmsk, linenum)))
|
|
return -1;
|
|
oflags = FI_OPTIONS;
|
|
} else if (***cp == 's' || ***cp == 'S') {
|
|
if (fr->fr_tcpf) {
|
|
fprintf(stderr,
|
|
"%d: short cannot be used with TCP flags\n",
|
|
linenum);
|
|
return -1;
|
|
}
|
|
|
|
if (!notopt)
|
|
fr->fr_ip.fi_fl |= FI_SHORT;
|
|
fr->fr_mip.fi_fl |= FI_SHORT;
|
|
goto nextopt;
|
|
} else
|
|
return -1;
|
|
|
|
if (!notopt || !opts)
|
|
fr->fr_mip.fi_fl |= oflags;
|
|
if (notopt) {
|
|
if (!secmsk) {
|
|
fr->fr_mip.fi_optmsk |= opts;
|
|
} else {
|
|
fr->fr_mip.fi_optmsk |= (opts & ~0x0100);
|
|
}
|
|
} else {
|
|
fr->fr_mip.fi_optmsk |= opts;
|
|
}
|
|
fr->fr_mip.fi_secmsk |= secmsk;
|
|
|
|
if (notopt) {
|
|
fr->fr_ip.fi_fl &= (~oflags & 0xf);
|
|
fr->fr_ip.fi_optmsk &= ~opts;
|
|
fr->fr_ip.fi_secmsk &= ~secmsk;
|
|
} else {
|
|
fr->fr_ip.fi_fl |= oflags;
|
|
fr->fr_ip.fi_optmsk |= opts;
|
|
fr->fr_ip.fi_secmsk |= secmsk;
|
|
}
|
|
nextopt:
|
|
notopt = 0;
|
|
opts = 0;
|
|
oflags = 0;
|
|
secmsk = 0;
|
|
(*cp)++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
u_32_t optname(cp, sp, linenum)
|
|
char ***cp;
|
|
u_short *sp;
|
|
int linenum;
|
|
{
|
|
struct ipopt_names *io, *so;
|
|
u_long msk = 0;
|
|
u_short smsk = 0;
|
|
char *s;
|
|
int sec = 0;
|
|
|
|
for (s = strtok(**cp, ","); s; s = strtok(NULL, ",")) {
|
|
for (io = ionames; io->on_name; io++)
|
|
if (!strcasecmp(s, io->on_name)) {
|
|
msk |= io->on_bit;
|
|
break;
|
|
}
|
|
if (!io->on_name) {
|
|
fprintf(stderr, "%d: unknown IP option name %s\n",
|
|
linenum, s);
|
|
return 0;
|
|
}
|
|
if (!strcasecmp(s, "sec-class"))
|
|
sec = 1;
|
|
}
|
|
|
|
if (sec && !*(*cp + 1)) {
|
|
fprintf(stderr, "%d: missing security level after sec-class\n",
|
|
linenum);
|
|
return 0;
|
|
}
|
|
|
|
if (sec) {
|
|
(*cp)++;
|
|
for (s = strtok(**cp, ","); s; s = strtok(NULL, ",")) {
|
|
for (so = secclass; so->on_name; so++)
|
|
if (!strcasecmp(s, so->on_name)) {
|
|
smsk |= so->on_bit;
|
|
break;
|
|
}
|
|
if (!so->on_name) {
|
|
fprintf(stderr,
|
|
"%d: no such security level: %s\n",
|
|
linenum, s);
|
|
return 0;
|
|
}
|
|
}
|
|
if (smsk)
|
|
*sp = smsk;
|
|
}
|
|
return msk;
|
|
}
|
|
|
|
|
|
#ifdef __STDC__
|
|
void optprint(u_short *sec, u_long optmsk, u_long optbits)
|
|
#else
|
|
void optprint(sec, optmsk, optbits)
|
|
u_short *sec;
|
|
u_long optmsk, optbits;
|
|
#endif
|
|
{
|
|
u_short secmsk = sec[0], secbits = sec[1];
|
|
struct ipopt_names *io, *so;
|
|
char *s;
|
|
int secflag = 0;
|
|
|
|
s = " opt ";
|
|
for (io = ionames; io->on_name; io++)
|
|
if ((io->on_bit & optmsk) &&
|
|
((io->on_bit & optmsk) == (io->on_bit & optbits))) {
|
|
if ((io->on_value != IPOPT_SECURITY) ||
|
|
(!secmsk && !secbits)) {
|
|
printf("%s%s", s, io->on_name);
|
|
if (io->on_value == IPOPT_SECURITY)
|
|
io++;
|
|
s = ",";
|
|
} else
|
|
secflag = 1;
|
|
}
|
|
|
|
|
|
if (secmsk & secbits) {
|
|
printf("%ssec-class", s);
|
|
s = " ";
|
|
for (so = secclass; so->on_name; so++)
|
|
if ((secmsk & so->on_bit) &&
|
|
((so->on_bit & secmsk) == (so->on_bit & secbits))) {
|
|
printf("%s%s", s, so->on_name);
|
|
s = ",";
|
|
}
|
|
}
|
|
|
|
if ((optmsk && (optmsk != optbits)) ||
|
|
(secmsk && (secmsk != secbits))) {
|
|
s = " ";
|
|
printf(" not opt");
|
|
if (optmsk != optbits) {
|
|
for (io = ionames; io->on_name; io++)
|
|
if ((io->on_bit & optmsk) &&
|
|
((io->on_bit & optmsk) !=
|
|
(io->on_bit & optbits))) {
|
|
if ((io->on_value != IPOPT_SECURITY) ||
|
|
(!secmsk && !secbits)) {
|
|
printf("%s%s", s, io->on_name);
|
|
s = ",";
|
|
if (io->on_value ==
|
|
IPOPT_SECURITY)
|
|
io++;
|
|
} else
|
|
io++;
|
|
}
|
|
}
|
|
|
|
if (secmsk != secbits) {
|
|
printf("%ssec-class", s);
|
|
s = " ";
|
|
for (so = secclass; so->on_name; so++)
|
|
if ((so->on_bit & secmsk) &&
|
|
((so->on_bit & secmsk) !=
|
|
(so->on_bit & secbits))) {
|
|
printf("%s%s", s, so->on_name);
|
|
s = ",";
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
char *icmptypes[] = {
|
|
"echorep", (char *)NULL, (char *)NULL, "unreach", "squench",
|
|
"redir", (char *)NULL, (char *)NULL, "echo", "routerad",
|
|
"routersol", "timex", "paramprob", "timest", "timestrep",
|
|
"inforeq", "inforep", "maskreq", "maskrep", "END"
|
|
};
|
|
|
|
/*
|
|
* set the icmp field to the correct type if "icmp" word is found
|
|
*/
|
|
int addicmp(cp, fp, linenum)
|
|
char ***cp;
|
|
struct frentry *fp;
|
|
int linenum;
|
|
{
|
|
char **t;
|
|
int i;
|
|
|
|
(*cp)++;
|
|
if (!**cp)
|
|
return -1;
|
|
if (!fp->fr_proto) /* to catch lusers */
|
|
fp->fr_proto = IPPROTO_ICMP;
|
|
if (isdigit(***cp)) {
|
|
if (!ratoi(**cp, &i, 0, 255)) {
|
|
fprintf(stderr,
|
|
"%d: Invalid icmp-type (%s) specified\n",
|
|
linenum, **cp);
|
|
return -1;
|
|
}
|
|
} else {
|
|
for (t = icmptypes, i = 0; ; t++, i++) {
|
|
if (!*t)
|
|
continue;
|
|
if (!strcasecmp("END", *t)) {
|
|
i = -1;
|
|
break;
|
|
}
|
|
if (!strcasecmp(*t, **cp))
|
|
break;
|
|
}
|
|
if (i == -1) {
|
|
fprintf(stderr,
|
|
"%d: Invalid icmp-type (%s) specified\n",
|
|
linenum, **cp);
|
|
return -1;
|
|
}
|
|
}
|
|
fp->fr_icmp = (u_short)(i << 8);
|
|
fp->fr_icmpm = (u_short)0xff00;
|
|
(*cp)++;
|
|
if (!**cp)
|
|
return 0;
|
|
|
|
if (**cp && strcasecmp("code", **cp))
|
|
return 0;
|
|
(*cp)++;
|
|
if (isdigit(***cp)) {
|
|
if (!ratoi(**cp, &i, 0, 255)) {
|
|
fprintf(stderr,
|
|
"%d: Invalid icmp code (%s) specified\n",
|
|
linenum, **cp);
|
|
return -1;
|
|
}
|
|
} else {
|
|
i = icmpcode(**cp);
|
|
if (i == -1) {
|
|
fprintf(stderr,
|
|
"%d: Invalid icmp code (%s) specified\n",
|
|
linenum, **cp);
|
|
return -1;
|
|
}
|
|
}
|
|
i &= 0xff;
|
|
fp->fr_icmp |= (u_short)i;
|
|
fp->fr_icmpm = (u_short)0xffff;
|
|
(*cp)++;
|
|
return 0;
|
|
}
|
|
|
|
|
|
#define MAX_ICMPCODE 15
|
|
|
|
char *icmpcodes[] = {
|
|
"net-unr", "host-unr", "proto-unr", "port-unr", "needfrag", "srcfail",
|
|
"net-unk", "host-unk", "isolate", "net-prohib", "host-prohib",
|
|
"net-tos", "host-tos", "filter-prohib", "host-preced", "preced-cutoff",
|
|
NULL };
|
|
/*
|
|
* Return the number for the associated ICMP unreachable code.
|
|
*/
|
|
int icmpcode(str)
|
|
char *str;
|
|
{
|
|
char *s;
|
|
int i, len;
|
|
|
|
if ((s = strrchr(str, ')')))
|
|
*s = '\0';
|
|
if (isdigit(*str)) {
|
|
if (!ratoi(str, &i, 0, 255))
|
|
return -1;
|
|
else
|
|
return i;
|
|
}
|
|
len = strlen(str);
|
|
for (i = 0; icmpcodes[i]; i++)
|
|
if (!strncasecmp(str, icmpcodes[i], MIN(len,
|
|
strlen(icmpcodes[i])) ))
|
|
return i;
|
|
return -1;
|
|
}
|
|
|
|
|
|
/*
|
|
* set the icmp field to the correct type if "icmp" word is found
|
|
*/
|
|
int addkeep(cp, fp, linenum)
|
|
char ***cp;
|
|
struct frentry *fp;
|
|
int linenum;
|
|
{
|
|
if (fp->fr_proto != IPPROTO_TCP && fp->fr_proto != IPPROTO_UDP &&
|
|
#ifdef USE_INET6
|
|
fp->fr_proto != IPPROTO_ICMPV6 &&
|
|
#endif
|
|
fp->fr_proto != IPPROTO_ICMP && !(fp->fr_ip.fi_fl & FI_TCPUDP)) {
|
|
fprintf(stderr, "%d: Can only use keep with UDP/ICMP/TCP\n",
|
|
linenum);
|
|
return -1;
|
|
}
|
|
|
|
(*cp)++;
|
|
if (!**cp) {
|
|
fprintf(stderr, "%d: Missing state/frag after keep\n",
|
|
linenum);
|
|
return -1;
|
|
}
|
|
if (strcasecmp(**cp, "state") && strcasecmp(**cp, "frags")) {
|
|
fprintf(stderr, "%d: Unrecognised state keyword \"%s\"\n",
|
|
linenum, **cp);
|
|
return -1;
|
|
}
|
|
|
|
if (***cp == 's' || ***cp == 'S')
|
|
fp->fr_flags |= FR_KEEPSTATE;
|
|
else if (***cp == 'f' || ***cp == 'F')
|
|
fp->fr_flags |= FR_KEEPFRAG;
|
|
(*cp)++;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* print the filter structure in a useful way
|
|
*/
|
|
void printfr(fp)
|
|
struct frentry *fp;
|
|
{
|
|
struct protoent *p;
|
|
u_short sec[2];
|
|
char *s;
|
|
u_char *t;
|
|
int pr;
|
|
|
|
if (fp->fr_flags & FR_PASS)
|
|
printf("pass");
|
|
else if (fp->fr_flags & FR_BLOCK) {
|
|
printf("block");
|
|
if (fp->fr_flags & FR_RETICMP) {
|
|
if ((fp->fr_flags & FR_RETMASK) == FR_FAKEICMP)
|
|
printf(" return-icmp-as-dest");
|
|
else if ((fp->fr_flags & FR_RETMASK) == FR_RETICMP)
|
|
printf(" return-icmp");
|
|
if (fp->fr_icode) {
|
|
if (fp->fr_icode <= MAX_ICMPCODE)
|
|
printf("(%s)",
|
|
icmpcodes[(int)fp->fr_icode]);
|
|
else
|
|
printf("(%d)", fp->fr_icode);
|
|
}
|
|
} else if ((fp->fr_flags & FR_RETMASK) == FR_RETRST)
|
|
printf(" return-rst");
|
|
} else if ((fp->fr_flags & FR_LOGMASK) == FR_LOG) {
|
|
printlog(fp);
|
|
} else if (fp->fr_flags & FR_ACCOUNT)
|
|
printf("count");
|
|
else if (fp->fr_flags & FR_AUTH)
|
|
printf("auth");
|
|
else if (fp->fr_flags & FR_PREAUTH)
|
|
printf("preauth");
|
|
else if (fp->fr_skip)
|
|
printf("skip %hu", fp->fr_skip);
|
|
|
|
if (fp->fr_flags & FR_OUTQUE)
|
|
printf(" out ");
|
|
else
|
|
printf(" in ");
|
|
|
|
if (((fp->fr_flags & FR_LOGB) == FR_LOGB) ||
|
|
((fp->fr_flags & FR_LOGP) == FR_LOGP)) {
|
|
printlog(fp);
|
|
putchar(' ');
|
|
}
|
|
|
|
if (fp->fr_flags & FR_QUICK)
|
|
printf("quick ");
|
|
|
|
if (*fp->fr_ifname) {
|
|
printf("on %s%s ", fp->fr_ifname,
|
|
(fp->fr_ifa || (long)fp->fr_ifa == -1) ? "" : "(!)");
|
|
if (*fp->fr_dif.fd_ifname)
|
|
print_toif("dup-to", &fp->fr_dif);
|
|
if (*fp->fr_tif.fd_ifname)
|
|
print_toif("to", &fp->fr_tif);
|
|
if (fp->fr_flags & FR_FASTROUTE)
|
|
printf("fastroute ");
|
|
|
|
}
|
|
if (fp->fr_mip.fi_tos)
|
|
printf("tos %#x ", fp->fr_tos);
|
|
if (fp->fr_mip.fi_ttl)
|
|
printf("ttl %d ", fp->fr_ttl);
|
|
if (fp->fr_ip.fi_fl & FI_TCPUDP) {
|
|
printf("proto tcp/udp ");
|
|
pr = -1;
|
|
} else if ((pr = fp->fr_mip.fi_p)) {
|
|
if ((p = getprotobynumber(fp->fr_proto)))
|
|
printf("proto %s ", p->p_name);
|
|
else
|
|
printf("proto %d ", fp->fr_proto);
|
|
}
|
|
|
|
printf("from %s", fp->fr_flags & FR_NOTSRCIP ? "!" : "");
|
|
printhostmask(fp->fr_v, (u_32_t *)&fp->fr_src.s_addr,
|
|
(u_32_t *)&fp->fr_smsk.s_addr);
|
|
if (fp->fr_scmp)
|
|
printportcmp(pr, &fp->fr_tuc.ftu_src);
|
|
|
|
printf(" to %s", fp->fr_flags & FR_NOTDSTIP ? "!" : "");
|
|
printhostmask(fp->fr_v, (u_32_t *)&fp->fr_dst.s_addr,
|
|
(u_32_t *)&fp->fr_dmsk.s_addr);
|
|
if (fp->fr_dcmp)
|
|
printportcmp(pr, &fp->fr_tuc.ftu_dst);
|
|
|
|
if ((fp->fr_ip.fi_fl & ~FI_TCPUDP) ||
|
|
(fp->fr_mip.fi_fl & ~FI_TCPUDP) ||
|
|
fp->fr_ip.fi_optmsk || fp->fr_mip.fi_optmsk ||
|
|
fp->fr_ip.fi_secmsk || fp->fr_mip.fi_secmsk) {
|
|
printf(" with");
|
|
if (fp->fr_ip.fi_optmsk || fp->fr_mip.fi_optmsk ||
|
|
fp->fr_ip.fi_secmsk || fp->fr_mip.fi_secmsk) {
|
|
sec[0] = fp->fr_mip.fi_secmsk;
|
|
sec[1] = fp->fr_ip.fi_secmsk;
|
|
optprint(sec,
|
|
fp->fr_mip.fi_optmsk, fp->fr_ip.fi_optmsk);
|
|
} else if (fp->fr_mip.fi_fl & FI_OPTIONS) {
|
|
if (!(fp->fr_ip.fi_fl & FI_OPTIONS))
|
|
printf(" not");
|
|
printf(" ipopt");
|
|
}
|
|
if (fp->fr_mip.fi_fl & FI_SHORT) {
|
|
if (!(fp->fr_ip.fi_fl & FI_SHORT))
|
|
printf(" not");
|
|
printf(" short");
|
|
}
|
|
if (fp->fr_mip.fi_fl & FI_FRAG) {
|
|
if (!(fp->fr_ip.fi_fl & FI_FRAG))
|
|
printf(" not");
|
|
printf(" frag");
|
|
}
|
|
}
|
|
if (fp->fr_proto == IPPROTO_ICMP && fp->fr_icmpm) {
|
|
int type = fp->fr_icmp, code;
|
|
|
|
type = ntohs(fp->fr_icmp);
|
|
code = type & 0xff;
|
|
type /= 256;
|
|
if (type < (sizeof(icmptypes) / sizeof(char *) - 1) &&
|
|
icmptypes[type])
|
|
printf(" icmp-type %s", icmptypes[type]);
|
|
else
|
|
printf(" icmp-type %d", type);
|
|
if (ntohs(fp->fr_icmpm) & 0xff)
|
|
printf(" code %d", code);
|
|
}
|
|
if (fp->fr_proto == IPPROTO_TCP && (fp->fr_tcpf || fp->fr_tcpfm)) {
|
|
printf(" flags ");
|
|
if (fp->fr_tcpf & ~TCPF_ALL)
|
|
printf("0x%x", fp->fr_tcpf);
|
|
else
|
|
for (s = flagset, t = flags; *s; s++, t++)
|
|
if (fp->fr_tcpf & *t)
|
|
(void)putchar(*s);
|
|
if (fp->fr_tcpfm) {
|
|
(void)putchar('/');
|
|
if (fp->fr_tcpfm & ~TCPF_ALL)
|
|
printf("0x%x", fp->fr_tcpfm);
|
|
else
|
|
for (s = flagset, t = flags; *s; s++, t++)
|
|
if (fp->fr_tcpfm & *t)
|
|
(void)putchar(*s);
|
|
}
|
|
}
|
|
|
|
if (fp->fr_flags & FR_KEEPSTATE)
|
|
printf(" keep state");
|
|
if (fp->fr_flags & FR_KEEPFRAG)
|
|
printf(" keep frags");
|
|
if (fp->fr_grhead)
|
|
printf(" head %d", fp->fr_grhead);
|
|
if (fp->fr_group)
|
|
printf(" group %d", fp->fr_group);
|
|
(void)putchar('\n');
|
|
}
|
|
|
|
void binprint(fp)
|
|
struct frentry *fp;
|
|
{
|
|
int i = sizeof(*fp), j = 0;
|
|
u_char *s;
|
|
|
|
for (s = (u_char *)fp; i; i--, s++) {
|
|
j++;
|
|
printf("%02x ", *s);
|
|
if (j == 16) {
|
|
printf("\n");
|
|
j = 0;
|
|
}
|
|
}
|
|
putchar('\n');
|
|
(void)fflush(stdout);
|
|
}
|
|
|
|
|
|
void printlog(fp)
|
|
frentry_t *fp;
|
|
{
|
|
char *s, *u;
|
|
|
|
printf("log");
|
|
if (fp->fr_flags & FR_LOGBODY)
|
|
printf(" body");
|
|
if (fp->fr_flags & FR_LOGFIRST)
|
|
printf(" first");
|
|
if (fp->fr_flags & FR_LOGORBLOCK)
|
|
printf(" or-block");
|
|
if (fp->fr_loglevel != 0xffff) {
|
|
printf(" level ");
|
|
if (fp->fr_loglevel & LOG_FACMASK) {
|
|
s = fac_toname(fp->fr_loglevel);
|
|
if (s == NULL)
|
|
s = "!!!";
|
|
} else
|
|
s = "";
|
|
u = pri_toname(fp->fr_loglevel);
|
|
if (u == NULL)
|
|
u = "!!!";
|
|
if (*s)
|
|
printf("%s.%s", s, u);
|
|
else
|
|
printf("%s", u);
|
|
}
|
|
}
|