701 lines
15 KiB
Plaintext
701 lines
15 KiB
Plaintext
/* $NetBSD: ipmon_y.y,v 1.1.1.3 2007/04/14 20:17:34 martin Exp $ */
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/*
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* Copyright (C) 2001-2004 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*/
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%{
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#include "ipf.h"
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#include <syslog.h>
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#undef OPT_NAT
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#undef OPT_VERBOSE
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#include "ipmon_l.h"
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#include "ipmon.h"
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#define YYDEBUG 1
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extern void yyerror __P((char *));
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extern int yyparse __P((void));
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extern int yylex __P((void));
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extern int yydebug;
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extern FILE *yyin;
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extern int yylineNum;
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typedef struct opt {
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struct opt *o_next;
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int o_line;
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int o_type;
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int o_num;
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char *o_str;
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struct in_addr o_ip;
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} opt_t;
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static void build_action __P((struct opt *));
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static opt_t *new_opt __P((int));
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static void free_action __P((ipmon_action_t *));
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static ipmon_action_t *alist = NULL;
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%}
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%union {
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char *str;
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u_32_t num;
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struct in_addr addr;
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struct opt *opt;
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union i6addr ip6;
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}
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%token <num> YY_NUMBER YY_HEX
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%token <str> YY_STR
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%token <ip6> YY_IPV6
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%token YY_COMMENT
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%token YY_CMP_EQ YY_CMP_NE YY_CMP_LE YY_CMP_GE YY_CMP_LT YY_CMP_GT
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%token YY_RANGE_OUT YY_RANGE_IN
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%token IPM_MATCH IPM_BODY IPM_COMMENT IPM_DIRECTION IPM_DSTIP IPM_DSTPORT
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%token IPM_EVERY IPM_EXECUTE IPM_GROUP IPM_INTERFACE IPM_IN IPM_NO IPM_OUT
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%token IPM_PACKET IPM_PACKETS IPM_POOL IPM_PROTOCOL IPM_RESULT IPM_RULE
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%token IPM_SECOND IPM_SECONDS IPM_SRCIP IPM_SRCPORT IPM_LOGTAG IPM_WITH
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%token IPM_DO IPM_SAVE IPM_SYSLOG IPM_NOTHING IPM_RAW IPM_TYPE IPM_NAT
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%token IPM_STATE IPM_NATTAG IPM_IPF
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%type <addr> ipv4
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%type <opt> direction dstip dstport every execute group interface
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%type <opt> protocol result rule srcip srcport logtag matching
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%type <opt> matchopt nattag type doopt doing save syslog nothing
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%type <num> saveopts saveopt typeopt
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%%
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file: line
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| assign
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| file line
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| file assign
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;
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line: IPM_MATCH '{' matching '}' IPM_DO '{' doing '}' ';'
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{ build_action($3); resetlexer(); }
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| IPM_COMMENT
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| YY_COMMENT
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;
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assign: YY_STR assigning YY_STR ';' { set_variable($1, $3);
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resetlexer();
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free($1);
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free($3);
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yyvarnext = 0;
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}
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;
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assigning:
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'=' { yyvarnext = 1; }
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;
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matching:
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matchopt { $$ = $1; }
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| matchopt ',' matching { $1->o_next = $3; $$ = $1; }
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;
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matchopt:
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direction { $$ = $1; }
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| dstip { $$ = $1; }
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| dstport { $$ = $1; }
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| every { $$ = $1; }
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| group { $$ = $1; }
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| interface { $$ = $1; }
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| protocol { $$ = $1; }
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| result { $$ = $1; }
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| rule { $$ = $1; }
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| srcip { $$ = $1; }
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| srcport { $$ = $1; }
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| logtag { $$ = $1; }
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| nattag { $$ = $1; }
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| type { $$ = $1; }
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;
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doing:
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doopt { $$ = $1; }
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| doopt ',' doing { $1->o_next = $3; $$ = $1; }
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;
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doopt:
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execute { $$ = $1; }
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| save { $$ = $1; }
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| syslog { $$ = $1; }
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| nothing { $$ = $1; }
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;
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direction:
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IPM_DIRECTION '=' IPM_IN { $$ = new_opt(IPM_DIRECTION);
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$$->o_num = IPM_IN; }
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| IPM_DIRECTION '=' IPM_OUT { $$ = new_opt(IPM_DIRECTION);
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$$->o_num = IPM_OUT; }
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;
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dstip: IPM_DSTIP '=' ipv4 '/' YY_NUMBER { $$ = new_opt(IPM_DSTIP);
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$$->o_ip = $3;
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$$->o_num = $5; }
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;
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dstport:
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IPM_DSTPORT '=' YY_NUMBER { $$ = new_opt(IPM_DSTPORT);
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$$->o_num = $3; }
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| IPM_DSTPORT '=' YY_STR { $$ = new_opt(IPM_DSTPORT);
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$$->o_str = $3; }
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;
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every: IPM_EVERY IPM_SECOND { $$ = new_opt(IPM_SECOND);
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$$->o_num = 1; }
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| IPM_EVERY YY_NUMBER IPM_SECONDS { $$ = new_opt(IPM_SECOND);
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$$->o_num = $2; }
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| IPM_EVERY IPM_PACKET { $$ = new_opt(IPM_PACKET);
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$$->o_num = 1; }
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| IPM_EVERY YY_NUMBER IPM_PACKETS { $$ = new_opt(IPM_PACKET);
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$$->o_num = $2; }
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;
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group: IPM_GROUP '=' YY_NUMBER { $$ = new_opt(IPM_GROUP);
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$$->o_num = $3; }
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| IPM_GROUP '=' YY_STR { $$ = new_opt(IPM_GROUP);
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$$->o_str = $3; }
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;
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interface:
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IPM_INTERFACE '=' YY_STR { $$ = new_opt(IPM_INTERFACE);
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$$->o_str = $3; }
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;
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logtag: IPM_LOGTAG '=' YY_NUMBER { $$ = new_opt(IPM_LOGTAG);
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$$->o_num = $3; }
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;
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nattag: IPM_NATTAG '=' YY_STR { $$ = new_opt(IPM_NATTAG);
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$$->o_str = $3; }
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;
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protocol:
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IPM_PROTOCOL '=' YY_NUMBER { $$ = new_opt(IPM_PROTOCOL);
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$$->o_num = $3; }
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| IPM_PROTOCOL '=' YY_STR { $$ = new_opt(IPM_PROTOCOL);
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$$->o_num = getproto($3);
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free($3);
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}
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;
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result: IPM_RESULT '=' YY_STR { $$ = new_opt(IPM_RESULT);
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$$->o_str = $3; }
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;
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rule: IPM_RULE '=' YY_NUMBER { $$ = new_opt(IPM_RULE);
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$$->o_num = YY_NUMBER; }
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;
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srcip: IPM_SRCIP '=' ipv4 '/' YY_NUMBER { $$ = new_opt(IPM_SRCIP);
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$$->o_ip = $3;
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$$->o_num = $5; }
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;
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srcport:
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IPM_SRCPORT '=' YY_NUMBER { $$ = new_opt(IPM_SRCPORT);
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$$->o_num = $3; }
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| IPM_SRCPORT '=' YY_STR { $$ = new_opt(IPM_SRCPORT);
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$$->o_str = $3; }
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;
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type: IPM_TYPE '=' typeopt { $$ = new_opt(IPM_TYPE);
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$$->o_num = $3; }
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;
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typeopt:
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IPM_IPF { $$ = IPL_MAGIC; }
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| IPM_NAT { $$ = IPL_MAGIC_NAT; }
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| IPM_STATE { $$ = IPL_MAGIC_STATE; }
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;
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execute:
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IPM_EXECUTE YY_STR { $$ = new_opt(IPM_EXECUTE);
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$$->o_str = $2; }
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;
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save: IPM_SAVE saveopts YY_STR { $$ = new_opt(IPM_SAVE);
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$$->o_num = $2;
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$$->o_str = $3; }
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;
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saveopts: { $$ = 0; }
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| saveopt { $$ = $1; }
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| saveopt ',' saveopts { $$ = $1 | $3; }
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;
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saveopt:
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IPM_RAW { $$ = IPMDO_SAVERAW; }
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;
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syslog: IPM_SYSLOG { $$ = new_opt(IPM_SYSLOG); }
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;
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nothing:
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IPM_NOTHING { $$ = 0; }
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;
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ipv4: YY_NUMBER '.' YY_NUMBER '.' YY_NUMBER '.' YY_NUMBER
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{ if ($1 > 255 || $3 > 255 || $5 > 255 || $7 > 255) {
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yyerror("Invalid octet string for IP address");
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return 0;
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}
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$$.s_addr = ($1 << 24) | ($3 << 16) | ($5 << 8) | $7;
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$$.s_addr = htonl($$.s_addr);
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}
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%%
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static struct wordtab yywords[] = {
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{ "body", IPM_BODY },
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{ "direction", IPM_DIRECTION },
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{ "do", IPM_DO },
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{ "dstip", IPM_DSTIP },
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{ "dstport", IPM_DSTPORT },
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{ "every", IPM_EVERY },
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{ "execute", IPM_EXECUTE },
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{ "group", IPM_GROUP },
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{ "in", IPM_IN },
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{ "interface", IPM_INTERFACE },
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{ "ipf", IPM_IPF },
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{ "logtag", IPM_LOGTAG },
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{ "match", IPM_MATCH },
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{ "nat", IPM_NAT },
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{ "nattag", IPM_NATTAG },
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{ "no", IPM_NO },
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{ "nothing", IPM_NOTHING },
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{ "out", IPM_OUT },
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{ "packet", IPM_PACKET },
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{ "packets", IPM_PACKETS },
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{ "protocol", IPM_PROTOCOL },
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{ "result", IPM_RESULT },
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{ "rule", IPM_RULE },
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{ "save", IPM_SAVE },
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{ "second", IPM_SECOND },
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{ "seconds", IPM_SECONDS },
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{ "srcip", IPM_SRCIP },
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{ "srcport", IPM_SRCPORT },
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{ "state", IPM_STATE },
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{ "syslog", IPM_SYSLOG },
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{ "with", IPM_WITH },
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{ NULL, 0 }
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};
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static int macflags[17][2] = {
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{ IPM_DIRECTION, IPMAC_DIRECTION },
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{ IPM_DSTIP, IPMAC_DSTIP },
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{ IPM_DSTPORT, IPMAC_DSTPORT },
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{ IPM_GROUP, IPMAC_GROUP },
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{ IPM_INTERFACE, IPMAC_INTERFACE },
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{ IPM_LOGTAG, IPMAC_LOGTAG },
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{ IPM_NATTAG, IPMAC_NATTAG },
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{ IPM_PACKET, IPMAC_EVERY },
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{ IPM_PROTOCOL, IPMAC_PROTOCOL },
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{ IPM_RESULT, IPMAC_RESULT },
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{ IPM_RULE, IPMAC_RULE },
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{ IPM_SECOND, IPMAC_EVERY },
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{ IPM_SRCIP, IPMAC_SRCIP },
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{ IPM_SRCPORT, IPMAC_SRCPORT },
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{ IPM_TYPE, IPMAC_TYPE },
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{ IPM_WITH, IPMAC_WITH },
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{ 0, 0 }
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};
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static opt_t *new_opt(type)
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int type;
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{
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opt_t *o;
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o = (opt_t *)malloc(sizeof(*o));
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o->o_type = type;
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o->o_line = yylineNum;
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o->o_num = 0;
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o->o_str = (char *)0;
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o->o_next = NULL;
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return o;
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}
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static void build_action(olist)
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opt_t *olist;
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{
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ipmon_action_t *a;
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opt_t *o;
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char c;
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int i;
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a = (ipmon_action_t *)calloc(1, sizeof(*a));
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if (a == NULL)
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return;
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while ((o = olist) != NULL) {
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/*
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* Check to see if the same comparator is being used more than
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* once per matching statement.
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*/
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for (i = 0; macflags[i][0]; i++)
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if (macflags[i][0] == o->o_type)
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break;
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if (macflags[i][1] & a->ac_mflag) {
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fprintf(stderr, "%s redfined on line %d\n",
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yykeytostr(o->o_type), yylineNum);
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if (o->o_str != NULL)
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free(o->o_str);
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olist = o->o_next;
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free(o);
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continue;
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}
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a->ac_mflag |= macflags[i][1];
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switch (o->o_type)
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{
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case IPM_DIRECTION :
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a->ac_direction = o->o_num;
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break;
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case IPM_DSTIP :
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a->ac_dip = o->o_ip.s_addr;
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a->ac_dmsk = htonl(0xffffffff << (32 - o->o_num));
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break;
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case IPM_DSTPORT :
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a->ac_dport = htons(o->o_num);
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break;
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case IPM_EXECUTE :
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a->ac_exec = o->o_str;
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c = *o->o_str;
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if (c== '"'|| c == '\'') {
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if (o->o_str[strlen(o->o_str) - 1] == c) {
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a->ac_run = strdup(o->o_str + 1);
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a->ac_run[strlen(a->ac_run) - 1] ='\0';
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} else
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a->ac_run = o->o_str;
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} else
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a->ac_run = o->o_str;
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o->o_str = NULL;
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break;
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case IPM_INTERFACE :
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a->ac_iface = o->o_str;
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o->o_str = NULL;
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break;
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case IPM_GROUP :
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if (o->o_str != NULL)
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strncpy(a->ac_group, o->o_str, FR_GROUPLEN);
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else
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sprintf(a->ac_group, "%d", o->o_num);
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break;
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case IPM_LOGTAG :
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a->ac_logtag = o->o_num;
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break;
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case IPM_NATTAG :
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strncpy(a->ac_nattag, o->o_str, sizeof(a->ac_nattag));
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break;
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case IPM_PACKET :
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a->ac_packet = o->o_num;
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break;
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case IPM_PROTOCOL :
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a->ac_proto = o->o_num;
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break;
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case IPM_RULE :
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a->ac_rule = o->o_num;
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break;
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case IPM_RESULT :
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if (!strcasecmp(o->o_str, "pass"))
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a->ac_result = IPMR_PASS;
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else if (!strcasecmp(o->o_str, "block"))
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a->ac_result = IPMR_BLOCK;
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else if (!strcasecmp(o->o_str, "nomatch"))
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a->ac_result = IPMR_NOMATCH;
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else if (!strcasecmp(o->o_str, "log"))
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a->ac_result = IPMR_LOG;
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break;
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case IPM_SECOND :
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a->ac_second = o->o_num;
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break;
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case IPM_SRCIP :
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a->ac_sip = o->o_ip.s_addr;
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a->ac_smsk = htonl(0xffffffff << (32 - o->o_num));
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break;
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case IPM_SRCPORT :
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a->ac_sport = htons(o->o_num);
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break;
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case IPM_SAVE :
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if (a->ac_savefile != NULL) {
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fprintf(stderr, "%s redfined on line %d\n",
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yykeytostr(o->o_type), yylineNum);
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break;
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}
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a->ac_savefile = strdup(o->o_str);
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a->ac_savefp = fopen(o->o_str, "a");
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a->ac_dflag |= o->o_num & IPMDO_SAVERAW;
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break;
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case IPM_SYSLOG :
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if (a->ac_syslog != 0) {
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fprintf(stderr, "%s redfined on line %d\n",
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yykeytostr(o->o_type), yylineNum);
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break;
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}
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a->ac_syslog = 1;
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break;
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case IPM_TYPE :
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a->ac_type = o->o_num;
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break;
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case IPM_WITH :
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break;
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default :
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break;
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}
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olist = o->o_next;
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if (o->o_str != NULL)
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free(o->o_str);
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free(o);
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}
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a->ac_next = alist;
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alist = a;
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}
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int check_action(buf, log, opts, lvl)
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char *buf, *log;
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int opts, lvl;
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{
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ipmon_action_t *a;
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struct timeval tv;
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ipflog_t *ipf;
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tcphdr_t *tcp;
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iplog_t *ipl;
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int matched;
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u_long t1;
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ip_t *ip;
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matched = 0;
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ipl = (iplog_t *)buf;
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ipf = (ipflog_t *)(ipl +1);
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ip = (ip_t *)(ipf + 1);
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tcp = (tcphdr_t *)((char *)ip + (IP_HL(ip) << 2));
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for (a = alist; a != NULL; a = a->ac_next) {
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if ((a->ac_mflag & IPMAC_DIRECTION) != 0) {
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if (a->ac_direction == IPM_IN) {
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if ((ipf->fl_flags & FR_INQUE) == 0)
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continue;
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} else if (a->ac_direction == IPM_OUT) {
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if ((ipf->fl_flags & FR_OUTQUE) == 0)
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continue;
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}
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}
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if ((a->ac_type != 0) && (a->ac_type != ipl->ipl_magic))
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continue;
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if ((a->ac_mflag & IPMAC_EVERY) != 0) {
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gettimeofday(&tv, NULL);
|
|
t1 = tv.tv_sec - a->ac_lastsec;
|
|
if (tv.tv_usec <= a->ac_lastusec)
|
|
t1--;
|
|
if (a->ac_second != 0) {
|
|
if (t1 < a->ac_second)
|
|
continue;
|
|
a->ac_lastsec = tv.tv_sec;
|
|
a->ac_lastusec = tv.tv_usec;
|
|
}
|
|
|
|
if (a->ac_packet != 0) {
|
|
if (a->ac_pktcnt == 0)
|
|
a->ac_pktcnt++;
|
|
else if (a->ac_pktcnt == a->ac_packet) {
|
|
a->ac_pktcnt = 0;
|
|
continue;
|
|
} else {
|
|
a->ac_pktcnt++;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ((a->ac_mflag & IPMAC_DSTIP) != 0) {
|
|
if ((ip->ip_dst.s_addr & a->ac_dmsk) != a->ac_dip)
|
|
continue;
|
|
}
|
|
|
|
if ((a->ac_mflag & IPMAC_DSTPORT) != 0) {
|
|
if (ip->ip_p != IPPROTO_UDP && ip->ip_p != IPPROTO_TCP)
|
|
continue;
|
|
if (tcp->th_dport != a->ac_dport)
|
|
continue;
|
|
}
|
|
|
|
if ((a->ac_mflag & IPMAC_GROUP) != 0) {
|
|
if (strncmp(a->ac_group, ipf->fl_group,
|
|
FR_GROUPLEN) != 0)
|
|
continue;
|
|
}
|
|
|
|
if ((a->ac_mflag & IPMAC_INTERFACE) != 0) {
|
|
if (strcmp(a->ac_iface, ipf->fl_ifname))
|
|
continue;
|
|
}
|
|
|
|
if ((a->ac_mflag & IPMAC_PROTOCOL) != 0) {
|
|
if (a->ac_proto != ip->ip_p)
|
|
continue;
|
|
}
|
|
|
|
if ((a->ac_mflag & IPMAC_RESULT) != 0) {
|
|
if ((ipf->fl_flags & FF_LOGNOMATCH) != 0) {
|
|
if (a->ac_result != IPMR_NOMATCH)
|
|
continue;
|
|
} else if (FR_ISPASS(ipf->fl_flags)) {
|
|
if (a->ac_result != IPMR_PASS)
|
|
continue;
|
|
} else if (FR_ISBLOCK(ipf->fl_flags)) {
|
|
if (a->ac_result != IPMR_BLOCK)
|
|
continue;
|
|
} else { /* Log only */
|
|
if (a->ac_result != IPMR_LOG)
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if ((a->ac_mflag & IPMAC_RULE) != 0) {
|
|
if (a->ac_rule != ipf->fl_rule)
|
|
continue;
|
|
}
|
|
|
|
if ((a->ac_mflag & IPMAC_SRCIP) != 0) {
|
|
if ((ip->ip_src.s_addr & a->ac_smsk) != a->ac_sip)
|
|
continue;
|
|
}
|
|
|
|
if ((a->ac_mflag & IPMAC_SRCPORT) != 0) {
|
|
if (ip->ip_p != IPPROTO_UDP && ip->ip_p != IPPROTO_TCP)
|
|
continue;
|
|
if (tcp->th_sport != a->ac_sport)
|
|
continue;
|
|
}
|
|
|
|
if ((a->ac_mflag & IPMAC_LOGTAG) != 0) {
|
|
if (a->ac_logtag != ipf->fl_logtag)
|
|
continue;
|
|
}
|
|
|
|
if ((a->ac_mflag & IPMAC_NATTAG) != 0) {
|
|
if (strncmp(a->ac_nattag, ipf->fl_nattag.ipt_tag,
|
|
IPFTAG_LEN) != 0)
|
|
continue;
|
|
}
|
|
|
|
matched = 1;
|
|
|
|
/*
|
|
* It matched so now execute the command
|
|
*/
|
|
if (a->ac_syslog != 0) {
|
|
syslog(lvl, "%s", log);
|
|
}
|
|
|
|
if (a->ac_savefp != NULL) {
|
|
if (a->ac_dflag & IPMDO_SAVERAW)
|
|
fwrite(ipl, 1, ipl->ipl_dsize, a->ac_savefp);
|
|
else
|
|
fputs(log, a->ac_savefp);
|
|
}
|
|
|
|
if (a->ac_exec != NULL) {
|
|
switch (fork())
|
|
{
|
|
case 0 :
|
|
{
|
|
FILE *pi;
|
|
|
|
pi = popen(a->ac_run, "w");
|
|
if (pi != NULL) {
|
|
fprintf(pi, "%s\n", log);
|
|
if ((opts & OPT_HEXHDR) != 0) {
|
|
dumphex(pi, 0, buf,
|
|
sizeof(*ipl) +
|
|
sizeof(*ipf));
|
|
}
|
|
if ((opts & OPT_HEXBODY) != 0) {
|
|
dumphex(pi, 0, (char *)ip,
|
|
ipf->fl_hlen +
|
|
ipf->fl_plen);
|
|
}
|
|
pclose(pi);
|
|
}
|
|
exit(1);
|
|
}
|
|
case -1 :
|
|
break;
|
|
default :
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return matched;
|
|
}
|
|
|
|
|
|
static void free_action(a)
|
|
ipmon_action_t *a;
|
|
{
|
|
if (a->ac_savefile != NULL) {
|
|
free(a->ac_savefile);
|
|
a->ac_savefile = NULL;
|
|
}
|
|
if (a->ac_savefp != NULL) {
|
|
fclose(a->ac_savefp);
|
|
a->ac_savefp = NULL;
|
|
}
|
|
if (a->ac_exec != NULL) {
|
|
free(a->ac_exec);
|
|
if (a->ac_run == a->ac_exec)
|
|
a->ac_run = NULL;
|
|
a->ac_exec = NULL;
|
|
}
|
|
if (a->ac_run != NULL) {
|
|
free(a->ac_run);
|
|
a->ac_run = NULL;
|
|
}
|
|
if (a->ac_iface != NULL) {
|
|
free(a->ac_iface);
|
|
a->ac_iface = NULL;
|
|
}
|
|
a->ac_next = NULL;
|
|
free(a);
|
|
}
|
|
|
|
|
|
int load_config(file)
|
|
char *file;
|
|
{
|
|
ipmon_action_t *a;
|
|
FILE *fp;
|
|
char *s;
|
|
|
|
s = getenv("YYDEBUG");
|
|
if (s != NULL)
|
|
yydebug = atoi(s);
|
|
else
|
|
yydebug = 0;
|
|
|
|
while ((a = alist) != NULL) {
|
|
alist = a->ac_next;
|
|
free_action(a);
|
|
}
|
|
|
|
yylineNum = 1;
|
|
|
|
(void) yysettab(yywords);
|
|
|
|
fp = fopen(file, "r");
|
|
if (!fp) {
|
|
perror("load_config:fopen:");
|
|
return -1;
|
|
}
|
|
yyin = fp;
|
|
while (!feof(fp))
|
|
yyparse();
|
|
fclose(fp);
|
|
return 0;
|
|
}
|