1451 lines
32 KiB
C
1451 lines
32 KiB
C
/* $NetBSD: ip_ftp_pxy.c,v 1.15 2009/08/19 08:36:10 darrenr Exp $ */
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/*
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* Copyright (C) 1997-2003 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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* Simple FTP transparent proxy for in-kernel use. For use with the NAT
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* code.
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*
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* Id: ip_ftp_pxy.c,v 2.88.2.28 2009/01/01 01:20:54 darrenr Exp
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(1, "$NetBSD: ip_ftp_pxy.c,v 1.15 2009/08/19 08:36:10 darrenr Exp $");
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#define IPF_FTP_PROXY
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#define IPF_MINPORTLEN 18
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#define IPF_MAXPORTLEN 30
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#define IPF_MIN227LEN 39
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#define IPF_MAX227LEN 51
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#define IPF_MIN229LEN 47
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#define IPF_MAX229LEN 51
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#define FTPXY_GO 0
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#define FTPXY_INIT 1
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#define FTPXY_USER_1 2
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#define FTPXY_USOK_1 3
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#define FTPXY_PASS_1 4
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#define FTPXY_PAOK_1 5
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#define FTPXY_AUTH_1 6
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#define FTPXY_AUOK_1 7
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#define FTPXY_ADAT_1 8
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#define FTPXY_ADOK_1 9
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#define FTPXY_ACCT_1 10
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#define FTPXY_ACOK_1 11
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#define FTPXY_USER_2 12
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#define FTPXY_USOK_2 13
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#define FTPXY_PASS_2 14
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#define FTPXY_PAOK_2 15
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#define FTPXY_JUNK_OK 0
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#define FTPXY_JUNK_BAD 1 /* Ignore all commands for this connection */
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#define FTPXY_JUNK_EOL 2 /* consume the rest of this line only */
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#define FTPXY_JUNK_CONT 3 /* Saerching for next numeric */
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/*
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* Values for FTP commands. Numerics cover 0-999
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*/
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#define FTPXY_C_PASV 1000
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int ippr_ftp_client __P((fr_info_t *, ip_t *, nat_t *, ftpinfo_t *, int));
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int ippr_ftp_complete __P((char *, size_t));
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int ippr_ftp_in __P((fr_info_t *, ap_session_t *, nat_t *));
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int ippr_ftp_init __P((void));
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void ippr_ftp_fini __P((void));
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int ippr_ftp_new __P((fr_info_t *, ap_session_t *, nat_t *));
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int ippr_ftp_out __P((fr_info_t *, ap_session_t *, nat_t *));
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int ippr_ftp_pasv __P((fr_info_t *, ip_t *, nat_t *, ftpinfo_t *, int));
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int ippr_ftp_epsv __P((fr_info_t *, ip_t *, nat_t *, ftpside_t *, int));
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int ippr_ftp_port __P((fr_info_t *, ip_t *, nat_t *, ftpside_t *, int));
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int ippr_ftp_process __P((fr_info_t *, nat_t *, ftpinfo_t *, int));
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int ippr_ftp_server __P((fr_info_t *, ip_t *, nat_t *, ftpinfo_t *, int));
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int ippr_ftp_valid __P((ftpinfo_t *, int, char *, size_t));
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int ippr_ftp_server_valid __P((ftpside_t *, char *, size_t));
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int ippr_ftp_client_valid __P((ftpside_t *, char *, size_t));
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u_short ippr_ftp_atoi __P((char **));
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int ippr_ftp_pasvreply __P((fr_info_t *, ip_t *, nat_t *, ftpside_t *,
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u_int, char *, char *, u_int));
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int ftp_proxy_init = 0;
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int ippr_ftp_pasvonly = 0;
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int ippr_ftp_insecure = 0; /* Do not require logins before transfers */
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int ippr_ftp_pasvrdr = 0;
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int ippr_ftp_forcepasv = 0; /* PASV must be last command prior to 227 */
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#if defined(_KERNEL)
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int ippr_ftp_debug = 0;
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#else
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int ippr_ftp_debug = 2;
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#endif
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/*
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* 1 - security
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* 2 - errors
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* 3 - error debugging
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* 4 - parsing errors
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* 5 - parsing info
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* 6 - parsing debug
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*/
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static frentry_t ftppxyfr;
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static ipftuneable_t ftptune = {
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{ &ippr_ftp_debug },
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"ippr_ftp_debug",
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0,
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10,
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sizeof(ippr_ftp_debug),
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0,
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NULL
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};
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/*
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* Initialize local structures.
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*/
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int ippr_ftp_init()
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{
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bzero((char *)&ftppxyfr, sizeof(ftppxyfr));
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ftppxyfr.fr_ref = 1;
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ftppxyfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
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MUTEX_INIT(&ftppxyfr.fr_lock, "FTP Proxy Mutex");
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ftp_proxy_init = 1;
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(void) fr_addipftune(&ftptune);
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return 0;
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}
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void ippr_ftp_fini()
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{
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(void) fr_delipftune(&ftptune);
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if (ftp_proxy_init == 1) {
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MUTEX_DESTROY(&ftppxyfr.fr_lock);
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ftp_proxy_init = 0;
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}
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}
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int ippr_ftp_new(fin, aps, nat)
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fr_info_t *fin;
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ap_session_t *aps;
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nat_t *nat;
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{
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ftpinfo_t *ftp;
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ftpside_t *f;
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KMALLOC(ftp, ftpinfo_t *);
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if (ftp == NULL)
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return -1;
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fin = fin; /* LINT */
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nat = nat; /* LINT */
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aps->aps_data = ftp;
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aps->aps_psiz = sizeof(ftpinfo_t);
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bzero((char *)ftp, sizeof(*ftp));
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f = &ftp->ftp_side[0];
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f->ftps_rptr = f->ftps_buf;
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f->ftps_wptr = f->ftps_buf;
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f = &ftp->ftp_side[1];
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f->ftps_rptr = f->ftps_buf;
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f->ftps_wptr = f->ftps_buf;
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ftp->ftp_passok = FTPXY_INIT;
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ftp->ftp_incok = 0;
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return 0;
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}
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int ippr_ftp_port(fin, ip, nat, f, dlen)
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fr_info_t *fin;
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ip_t *ip;
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nat_t *nat;
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ftpside_t *f;
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int dlen;
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{
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tcphdr_t *tcp, tcph, *tcp2 = &tcph;
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char newbuf[IPF_FTPBUFSZ], *s;
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struct in_addr swip, swip2;
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u_int a1, a2, a3, a4;
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int inc, off, flags;
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u_short a5, a6, sp;
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size_t nlen, olen;
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fr_info_t fi;
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nat_t *nat2;
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mb_t *m;
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m = fin->fin_m;
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tcp = (tcphdr_t *)fin->fin_dp;
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off = (char *)tcp - (char *)ip + (TCP_OFF(tcp) << 2) + fin->fin_ipoff;
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/*
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* Check for client sending out PORT message.
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*/
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if (dlen < IPF_MINPORTLEN) {
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if (ippr_ftp_debug > 1)
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printf("ippr_ftp_port:dlen(%d) < IPF_MINPORTLEN\n",
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dlen);
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return 0;
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}
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/*
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* Skip the PORT command + space
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*/
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s = f->ftps_rptr + 5;
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/*
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* Pick out the address components, two at a time.
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*/
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a1 = ippr_ftp_atoi(&s);
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if (s == NULL) {
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if (ippr_ftp_debug > 1)
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printf("ippr_ftp_port:ippr_ftp_atoi(%d) failed\n", 1);
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return 0;
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}
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a2 = ippr_ftp_atoi(&s);
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if (s == NULL) {
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if (ippr_ftp_debug > 1)
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printf("ippr_ftp_port:ippr_ftp_atoi(%d) failed\n", 2);
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return 0;
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}
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/*
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* Check that IP address in the PORT/PASV reply is the same as the
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* sender of the command - prevents using PORT for port scanning.
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*/
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a1 <<= 16;
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a1 |= a2;
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if (((nat->nat_dir == NAT_OUTBOUND) &&
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(a1 != ntohl(nat->nat_inip.s_addr))) ||
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((nat->nat_dir == NAT_INBOUND) &&
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(a1 != ntohl(nat->nat_oip.s_addr)))) {
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if (ippr_ftp_debug > 0)
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printf("ippr_ftp_port:%s != nat->nat_inip\n", "a1");
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return APR_ERR(1);
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}
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a5 = ippr_ftp_atoi(&s);
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if (s == NULL) {
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if (ippr_ftp_debug > 1)
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printf("ippr_ftp_port:ippr_ftp_atoi(%d) failed\n", 3);
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return 0;
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}
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if (*s == ')')
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s++;
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/*
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* check for CR-LF at the end.
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*/
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if (*s == '\n')
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s--;
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if ((*s == '\r') && (*(s + 1) == '\n')) {
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s += 2;
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a6 = a5 & 0xff;
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} else {
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if (ippr_ftp_debug > 1)
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printf("ippr_ftp_port:missing %s\n", "cr-lf");
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return 0;
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}
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a5 >>= 8;
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a5 &= 0xff;
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sp = a5 << 8 | a6;
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/*
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* Don't allow the PORT command to specify a port < 1024 due to
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* security crap.
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*/
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if (sp < 1024) {
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if (ippr_ftp_debug > 0)
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printf("ippr_ftp_port:sp(%d) < 1024\n", sp);
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return 0;
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}
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/*
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* Calculate new address parts for PORT command
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*/
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if (nat->nat_dir == NAT_INBOUND)
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a1 = ntohl(nat->nat_oip.s_addr);
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else
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a1 = ntohl(ip->ip_src.s_addr);
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a2 = (a1 >> 16) & 0xff;
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a3 = (a1 >> 8) & 0xff;
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a4 = a1 & 0xff;
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a1 >>= 24;
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olen = s - f->ftps_rptr;
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/* DO NOT change this to snprintf! */
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#if defined(SNPRINTF) && defined(_KERNEL)
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SNPRINTF(newbuf, sizeof(newbuf), "%s %u,%u,%u,%u,%u,%u\r\n",
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"PORT", a1, a2, a3, a4, a5, a6);
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#else
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(void) sprintf(newbuf, "%s %u,%u,%u,%u,%u,%u\r\n",
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"PORT", a1, a2, a3, a4, a5, a6);
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#endif
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nlen = strlen(newbuf);
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inc = nlen - olen;
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if ((inc + ip->ip_len) > 65535) {
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if (ippr_ftp_debug > 0)
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printf("ippr_ftp_port:inc(%d) + ip->ip_len > 65535\n",
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inc);
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return 0;
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}
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#if !defined(_KERNEL)
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bcopy(newbuf, MTOD(m, char *) + off, nlen);
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#else
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# if defined(MENTAT)
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if (inc < 0)
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(void)adjmsg(m, inc);
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# else /* defined(MENTAT) */
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/*
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* m_adj takes care of pkthdr.len, if required and treats inc<0 to
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* mean remove -len bytes from the end of the packet.
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* The mbuf chain will be extended if necessary by m_copyback().
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*/
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if (inc < 0)
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m_adj(m, inc);
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# endif /* defined(MENTAT) */
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#endif /* !defined(_KERNEL) */
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COPYBACK(m, off, nlen, newbuf);
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if (inc != 0) {
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ip->ip_len += inc;
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fin->fin_dlen += inc;
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fin->fin_plen += inc;
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}
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/*
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* The server may not make the connection back from port 20, but
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* it is the most likely so use it here to check for a conflicting
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* mapping.
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*/
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bcopy((char *)fin, (char *)&fi, sizeof(fi));
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fi.fin_flx |= FI_IGNORE;
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fi.fin_data[0] = sp;
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fi.fin_data[1] = fin->fin_data[1] - 1;
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/*
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* Add skeleton NAT entry for connection which will come back the
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* other way.
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*/
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if (nat->nat_dir == NAT_OUTBOUND)
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nat2 = nat_outlookup(&fi, NAT_SEARCH|IPN_TCP, nat->nat_p,
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nat->nat_inip, nat->nat_oip);
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else
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nat2 = nat_inlookup(&fi, NAT_SEARCH|IPN_TCP, nat->nat_p,
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nat->nat_inip, nat->nat_oip);
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if (nat2 == NULL) {
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int slen;
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slen = ip->ip_len;
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ip->ip_len = fin->fin_hlen + sizeof(*tcp2);
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bzero((char *)tcp2, sizeof(*tcp2));
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tcp2->th_win = htons(8192);
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tcp2->th_sport = htons(sp);
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TCP_OFF_A(tcp2, 5);
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tcp2->th_flags = TH_SYN;
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tcp2->th_dport = 0; /* XXX - don't specify remote port */
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fi.fin_data[1] = 0;
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fi.fin_dlen = sizeof(*tcp2);
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fi.fin_plen = fi.fin_hlen + sizeof(*tcp2);
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fi.fin_dp = (char *)tcp2;
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fi.fin_fr = &ftppxyfr;
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fi.fin_out = nat->nat_dir;
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fi.fin_flx &= FI_LOWTTL|FI_FRAG|FI_TCPUDP|FI_OPTIONS|FI_IGNORE;
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swip = ip->ip_src;
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swip2 = ip->ip_dst;
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if (nat->nat_dir == NAT_OUTBOUND) {
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fi.fin_fi.fi_saddr = nat->nat_inip.s_addr;
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ip->ip_src = nat->nat_inip;
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} else if (nat->nat_dir == NAT_INBOUND) {
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fi.fin_fi.fi_saddr = nat->nat_oip.s_addr;
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ip->ip_src = nat->nat_oip;
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}
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flags = NAT_SLAVE|IPN_TCP|SI_W_DPORT;
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if (nat->nat_dir == NAT_INBOUND)
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flags |= NAT_NOTRULEPORT;
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MUTEX_ENTER(&ipf_nat_new);
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nat2 = nat_new(&fi, nat->nat_ptr, NULL, flags, nat->nat_dir);
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MUTEX_EXIT(&ipf_nat_new);
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if (nat2 != NULL) {
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(void) nat_proto(&fi, nat2, IPN_TCP);
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MUTEX_ENTER(&nat2->nat_lock);
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nat_update(&fi, nat2);
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MUTEX_EXIT(&nat2->nat_lock);
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fi.fin_ifp = NULL;
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if (nat->nat_dir == NAT_INBOUND) {
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fi.fin_fi.fi_daddr = nat->nat_inip.s_addr;
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ip->ip_dst = nat->nat_inip;
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}
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(void) fr_addstate(&fi, NULL, SI_W_DPORT);
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}
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ip->ip_len = slen;
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ip->ip_src = swip;
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ip->ip_dst = swip2;
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}
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return APR_INC(inc);
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}
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int ippr_ftp_client(fin, ip, nat, ftp, dlen)
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fr_info_t *fin;
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nat_t *nat;
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ftpinfo_t *ftp;
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ip_t *ip;
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int dlen;
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{
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char *rptr, *wptr, cmd[6], c;
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ftpside_t *f;
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int inc, i;
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inc = 0;
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f = &ftp->ftp_side[0];
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rptr = f->ftps_rptr;
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wptr = f->ftps_wptr;
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for (i = 0; (i < 5) && (i < dlen); i++) {
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c = rptr[i];
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if (ISALPHA(c)) {
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cmd[i] = TOUPPER(c);
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} else {
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cmd[i] = c;
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}
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}
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cmd[i] = '\0';
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ftp->ftp_incok = 0;
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if (!strncmp(cmd, "USER ", 5) || !strncmp(cmd, "XAUT ", 5)) {
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if (ftp->ftp_passok == FTPXY_ADOK_1 ||
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ftp->ftp_passok == FTPXY_AUOK_1) {
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ftp->ftp_passok = FTPXY_USER_2;
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ftp->ftp_incok = 1;
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} else {
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ftp->ftp_passok = FTPXY_USER_1;
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ftp->ftp_incok = 1;
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}
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} else if (!strncmp(cmd, "AUTH ", 5)) {
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ftp->ftp_passok = FTPXY_AUTH_1;
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ftp->ftp_incok = 1;
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} else if (!strncmp(cmd, "PASS ", 5)) {
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if (ftp->ftp_passok == FTPXY_USOK_1) {
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ftp->ftp_passok = FTPXY_PASS_1;
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ftp->ftp_incok = 1;
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} else if (ftp->ftp_passok == FTPXY_USOK_2) {
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ftp->ftp_passok = FTPXY_PASS_2;
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ftp->ftp_incok = 1;
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}
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} else if ((ftp->ftp_passok == FTPXY_AUOK_1) &&
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!strncmp(cmd, "ADAT ", 5)) {
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ftp->ftp_passok = FTPXY_ADAT_1;
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ftp->ftp_incok = 1;
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} else if ((ftp->ftp_passok == FTPXY_PAOK_1 ||
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ftp->ftp_passok == FTPXY_PAOK_2) &&
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!strncmp(cmd, "ACCT ", 5)) {
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ftp->ftp_passok = FTPXY_ACCT_1;
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ftp->ftp_incok = 1;
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} else if ((ftp->ftp_passok == FTPXY_GO) && !ippr_ftp_pasvonly &&
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!strncmp(cmd, "PORT ", 5)) {
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inc = ippr_ftp_port(fin, ip, nat, f, dlen);
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} else if (ippr_ftp_insecure && !ippr_ftp_pasvonly &&
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!strncmp(cmd, "PORT ", 5)) {
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inc = ippr_ftp_port(fin, ip, nat, f, dlen);
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}
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while ((*rptr++ != '\n') && (rptr < wptr))
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;
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f->ftps_rptr = rptr;
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return inc;
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}
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int ippr_ftp_pasv(fin, ip, nat, ftp, dlen)
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fr_info_t *fin;
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|
ip_t *ip;
|
|
nat_t *nat;
|
|
ftpinfo_t *ftp;
|
|
int dlen;
|
|
{
|
|
u_int a1, a2, a3, a4, data_ip;
|
|
char newbuf[IPF_FTPBUFSZ];
|
|
const char *brackets[2];
|
|
u_short a5, a6;
|
|
ftpside_t *f;
|
|
char *s;
|
|
|
|
if (ippr_ftp_forcepasv != 0 &&
|
|
ftp->ftp_side[0].ftps_cmds != FTPXY_C_PASV) {
|
|
if (ippr_ftp_debug > 0)
|
|
printf("ippr_ftp_pasv:ftps_cmds(%d) != FTPXY_C_PASV\n",
|
|
ftp->ftp_side[0].ftps_cmds);
|
|
return 0;
|
|
}
|
|
|
|
f = &ftp->ftp_side[1];
|
|
|
|
#define PASV_REPLEN 24
|
|
/*
|
|
* Check for PASV reply message.
|
|
*/
|
|
if (dlen < IPF_MIN227LEN) {
|
|
if (ippr_ftp_debug > 1)
|
|
printf("ippr_ftp_pasv:dlen(%d) < IPF_MIN227LEN\n",
|
|
dlen);
|
|
return 0;
|
|
} else if (strncmp(f->ftps_rptr,
|
|
"227 Entering Passive Mod", PASV_REPLEN)) {
|
|
if (ippr_ftp_debug > 0)
|
|
printf("ippr_ftp_pasv:%d reply wrong\n", 227);
|
|
return 0;
|
|
}
|
|
|
|
brackets[0] = "";
|
|
brackets[1] = "";
|
|
/*
|
|
* Skip the PASV reply + space
|
|
*/
|
|
s = f->ftps_rptr + PASV_REPLEN;
|
|
while (*s && !ISDIGIT(*s)) {
|
|
if (*s == '(') {
|
|
brackets[0] = "(";
|
|
brackets[1] = ")";
|
|
}
|
|
s++;
|
|
}
|
|
|
|
/*
|
|
* Pick out the address components, two at a time.
|
|
*/
|
|
a1 = ippr_ftp_atoi(&s);
|
|
if (s == NULL) {
|
|
if (ippr_ftp_debug > 1)
|
|
printf("ippr_ftp_pasv:ippr_ftp_atoi(%d) failed\n", 1);
|
|
return 0;
|
|
}
|
|
a2 = ippr_ftp_atoi(&s);
|
|
if (s == NULL) {
|
|
if (ippr_ftp_debug > 1)
|
|
printf("ippr_ftp_pasv:ippr_ftp_atoi(%d) failed\n", 2);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* check that IP address in the PASV reply is the same as the
|
|
* sender of the command - prevents using PASV for port scanning.
|
|
*/
|
|
a1 <<= 16;
|
|
a1 |= a2;
|
|
|
|
if (((nat->nat_dir == NAT_INBOUND) &&
|
|
(a1 != ntohl(nat->nat_inip.s_addr))) ||
|
|
((nat->nat_dir == NAT_OUTBOUND) &&
|
|
(a1 != ntohl(nat->nat_oip.s_addr)))) {
|
|
if (ippr_ftp_debug > 0)
|
|
printf("ippr_ftp_pasv:%s != nat->nat_oip\n", "a1");
|
|
return 0;
|
|
}
|
|
|
|
a5 = ippr_ftp_atoi(&s);
|
|
if (s == NULL) {
|
|
if (ippr_ftp_debug > 1)
|
|
printf("ippr_ftp_pasv:ippr_ftp_atoi(%d) failed\n", 3);
|
|
return 0;
|
|
}
|
|
|
|
if (*s == ')')
|
|
s++;
|
|
if (*s == '.')
|
|
s++;
|
|
if (*s == '\n')
|
|
s--;
|
|
/*
|
|
* check for CR-LF at the end.
|
|
*/
|
|
if ((*s == '\r') && (*(s + 1) == '\n')) {
|
|
s += 2;
|
|
} else {
|
|
if (ippr_ftp_debug > 1)
|
|
printf("ippr_ftp_pasv:missing %s", "cr-lf\n");
|
|
return 0;
|
|
}
|
|
|
|
a6 = a5 & 0xff;
|
|
a5 >>= 8;
|
|
/*
|
|
* Calculate new address parts for 227 reply
|
|
*/
|
|
if (nat->nat_dir == NAT_INBOUND) {
|
|
data_ip = nat->nat_outip.s_addr;
|
|
a1 = ntohl(data_ip);
|
|
} else
|
|
data_ip = htonl(a1);
|
|
|
|
a2 = (a1 >> 16) & 0xff;
|
|
a3 = (a1 >> 8) & 0xff;
|
|
a4 = a1 & 0xff;
|
|
a1 >>= 24;
|
|
|
|
#if defined(SNPRINTF) && defined(_KERNEL)
|
|
SNPRINTF(newbuf, sizeof(newbuf), "%s %s%u,%u,%u,%u,%u,%u%s\r\n",
|
|
"227 Entering Passive Mode", brackets[0], a1, a2, a3, a4,
|
|
a5, a6, brackets[1]);
|
|
#else
|
|
(void) sprintf(newbuf, "%s %s%u,%u,%u,%u,%u,%u%s\r\n",
|
|
"227 Entering Passive Mode", brackets[0], a1, a2, a3, a4,
|
|
a5, a6, brackets[1]);
|
|
#endif
|
|
return ippr_ftp_pasvreply(fin, ip, nat, f, (a5 << 8 | a6),
|
|
newbuf, s, data_ip);
|
|
}
|
|
|
|
int ippr_ftp_pasvreply(fin, ip, nat, f, port, newmsg, s, data_ip)
|
|
fr_info_t *fin;
|
|
ip_t *ip;
|
|
nat_t *nat;
|
|
ftpside_t *f;
|
|
u_int port;
|
|
char *newmsg;
|
|
char *s;
|
|
u_int data_ip;
|
|
{
|
|
int inc, off, nflags, sflags;
|
|
tcphdr_t *tcp, tcph, *tcp2;
|
|
struct in_addr swip, swip2;
|
|
struct in_addr data_addr;
|
|
size_t nlen, olen;
|
|
fr_info_t fi;
|
|
nat_t *nat2;
|
|
mb_t *m;
|
|
|
|
m = fin->fin_m;
|
|
tcp = (tcphdr_t *)fin->fin_dp;
|
|
off = (char *)tcp - (char *)ip + (TCP_OFF(tcp) << 2) + fin->fin_ipoff;
|
|
|
|
data_addr.s_addr = data_ip;
|
|
tcp2 = &tcph;
|
|
inc = 0;
|
|
|
|
|
|
olen = s - f->ftps_rptr;
|
|
nlen = strlen(newmsg);
|
|
inc = nlen - olen;
|
|
if ((inc + ip->ip_len) > 65535) {
|
|
if (ippr_ftp_debug > 0)
|
|
printf("ippr_ftp_pasv:inc(%d) + ip->ip_len > 65535\n",
|
|
inc);
|
|
return 0;
|
|
}
|
|
|
|
#if !defined(_KERNEL)
|
|
bcopy(newmsg, MTOD(m, char *) + off, nlen);
|
|
#else
|
|
# if defined(MENTAT)
|
|
if (inc < 0)
|
|
(void)adjmsg(m, inc);
|
|
# else /* defined(MENTAT) */
|
|
/*
|
|
* m_adj takes care of pkthdr.len, if required and treats inc<0 to
|
|
* mean remove -len bytes from the end of the packet.
|
|
* The mbuf chain will be extended if necessary by m_copyback().
|
|
*/
|
|
if (inc < 0)
|
|
m_adj(m, inc);
|
|
# endif /* defined(MENTAT) */
|
|
#endif /* !defined(_KERNEL) */
|
|
COPYBACK(m, off, nlen, newmsg);
|
|
|
|
if (inc != 0) {
|
|
ip->ip_len += inc;
|
|
fin->fin_dlen += inc;
|
|
fin->fin_plen += inc;
|
|
}
|
|
|
|
/*
|
|
* Add skeleton NAT entry for connection which will come back the
|
|
* other way.
|
|
*/
|
|
bcopy((char *)fin, (char *)&fi, sizeof(fi));
|
|
fi.fin_flx |= FI_IGNORE;
|
|
fi.fin_data[0] = 0;
|
|
fi.fin_data[1] = port;
|
|
nflags = IPN_TCP|SI_W_SPORT;
|
|
if (ippr_ftp_pasvrdr && f->ftps_ifp)
|
|
nflags |= SI_W_DPORT;
|
|
if (nat->nat_dir == NAT_OUTBOUND)
|
|
nat2 = nat_outlookup(&fi, nflags|NAT_SEARCH,
|
|
nat->nat_p, nat->nat_inip, nat->nat_oip);
|
|
else
|
|
nat2 = nat_inlookup(&fi, nflags|NAT_SEARCH,
|
|
nat->nat_p, nat->nat_inip, nat->nat_oip);
|
|
if (nat2 == NULL) {
|
|
int slen;
|
|
|
|
slen = ip->ip_len;
|
|
ip->ip_len = fin->fin_hlen + sizeof(*tcp2);
|
|
bzero((char *)tcp2, sizeof(*tcp2));
|
|
tcp2->th_win = htons(8192);
|
|
tcp2->th_sport = 0; /* XXX - fake it for nat_new */
|
|
TCP_OFF_A(tcp2, 5);
|
|
tcp2->th_flags = TH_SYN;
|
|
fi.fin_data[1] = port;
|
|
fi.fin_dlen = sizeof(*tcp2);
|
|
tcp2->th_dport = htons(port);
|
|
fi.fin_data[0] = 0;
|
|
fi.fin_dp = (char *)tcp2;
|
|
fi.fin_plen = fi.fin_hlen + sizeof(*tcp);
|
|
fi.fin_fr = &ftppxyfr;
|
|
fi.fin_out = nat->nat_dir;
|
|
fi.fin_flx &= FI_LOWTTL|FI_FRAG|FI_TCPUDP|FI_OPTIONS|FI_IGNORE;
|
|
swip = ip->ip_src;
|
|
swip2 = ip->ip_dst;
|
|
if (nat->nat_dir == NAT_OUTBOUND) {
|
|
fi.fin_fi.fi_daddr = data_addr.s_addr;
|
|
fi.fin_fi.fi_saddr = nat->nat_inip.s_addr;
|
|
ip->ip_dst = data_addr;
|
|
ip->ip_src = nat->nat_inip;
|
|
} else if (nat->nat_dir == NAT_INBOUND) {
|
|
fi.fin_fi.fi_saddr = nat->nat_oip.s_addr;
|
|
fi.fin_fi.fi_daddr = nat->nat_outip.s_addr;
|
|
ip->ip_src = nat->nat_oip;
|
|
ip->ip_dst = nat->nat_outip;
|
|
}
|
|
|
|
sflags = nflags;
|
|
nflags |= NAT_SLAVE;
|
|
if (nat->nat_dir == NAT_INBOUND)
|
|
nflags |= NAT_NOTRULEPORT;
|
|
MUTEX_ENTER(&ipf_nat_new);
|
|
nat2 = nat_new(&fi, nat->nat_ptr, NULL, nflags, nat->nat_dir);
|
|
MUTEX_EXIT(&ipf_nat_new);
|
|
if (nat2 != NULL) {
|
|
(void) nat_proto(&fi, nat2, IPN_TCP);
|
|
MUTEX_ENTER(&nat2->nat_lock);
|
|
nat_update(&fi, nat2);
|
|
MUTEX_EXIT(&nat2->nat_lock);
|
|
fi.fin_ifp = NULL;
|
|
if (nat->nat_dir == NAT_INBOUND) {
|
|
fi.fin_fi.fi_daddr = nat->nat_inip.s_addr;
|
|
ip->ip_dst = nat->nat_inip;
|
|
}
|
|
(void) fr_addstate(&fi, NULL, sflags);
|
|
}
|
|
|
|
ip->ip_len = slen;
|
|
ip->ip_src = swip;
|
|
ip->ip_dst = swip2;
|
|
}
|
|
return inc;
|
|
}
|
|
|
|
|
|
int ippr_ftp_server(fin, ip, nat, ftp, dlen)
|
|
fr_info_t *fin;
|
|
ip_t *ip;
|
|
nat_t *nat;
|
|
ftpinfo_t *ftp;
|
|
int dlen;
|
|
{
|
|
char *rptr, *wptr;
|
|
ftpside_t *f;
|
|
int inc;
|
|
|
|
inc = 0;
|
|
f = &ftp->ftp_side[1];
|
|
rptr = f->ftps_rptr;
|
|
wptr = f->ftps_wptr;
|
|
|
|
if (*rptr == ' ')
|
|
goto server_cmd_ok;
|
|
if (!ISDIGIT(*rptr) || !ISDIGIT(*(rptr + 1)) || !ISDIGIT(*(rptr + 2)))
|
|
return 0;
|
|
if (ftp->ftp_passok == FTPXY_GO) {
|
|
if (!strncmp(rptr, "227 ", 4))
|
|
inc = ippr_ftp_pasv(fin, ip, nat, ftp, dlen);
|
|
else if (!strncmp(rptr, "229 ", 4))
|
|
inc = ippr_ftp_epsv(fin, ip, nat, f, dlen);
|
|
} else if (ippr_ftp_insecure && !strncmp(rptr, "227 ", 4)) {
|
|
inc = ippr_ftp_pasv(fin, ip, nat, ftp, dlen);
|
|
} else if (ippr_ftp_insecure && !strncmp(rptr, "229 ", 4)) {
|
|
inc = ippr_ftp_epsv(fin, ip, nat, f, dlen);
|
|
} else if (*rptr == '5' || *rptr == '4')
|
|
ftp->ftp_passok = FTPXY_INIT;
|
|
else if (ftp->ftp_incok) {
|
|
if (*rptr == '3') {
|
|
if (ftp->ftp_passok == FTPXY_ACCT_1)
|
|
ftp->ftp_passok = FTPXY_GO;
|
|
else
|
|
ftp->ftp_passok++;
|
|
} else if (*rptr == '2') {
|
|
switch (ftp->ftp_passok)
|
|
{
|
|
case FTPXY_USER_1 :
|
|
case FTPXY_USER_2 :
|
|
case FTPXY_PASS_1 :
|
|
case FTPXY_PASS_2 :
|
|
case FTPXY_ACCT_1 :
|
|
ftp->ftp_passok = FTPXY_GO;
|
|
break;
|
|
default :
|
|
ftp->ftp_passok += 3;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
server_cmd_ok:
|
|
ftp->ftp_incok = 0;
|
|
|
|
while ((*rptr++ != '\n') && (rptr < wptr))
|
|
;
|
|
f->ftps_rptr = rptr;
|
|
return inc;
|
|
}
|
|
|
|
|
|
/*
|
|
* Look to see if the buffer starts with something which we recognise as
|
|
* being the correct syntax for the FTP protocol.
|
|
*/
|
|
int ippr_ftp_client_valid(ftps, buf, len)
|
|
ftpside_t *ftps;
|
|
char *buf;
|
|
size_t len;
|
|
{
|
|
register char *s, c, pc;
|
|
register size_t i = len;
|
|
char cmd[5];
|
|
|
|
s = buf;
|
|
|
|
if (ftps->ftps_junk == FTPXY_JUNK_BAD)
|
|
return FTPXY_JUNK_BAD;
|
|
|
|
if (i < 5) {
|
|
if (ippr_ftp_debug > 3)
|
|
printf("ippr_ftp_client_valid:i(%d) < 5\n", (int)i);
|
|
return 2;
|
|
}
|
|
|
|
i--;
|
|
c = *s++;
|
|
|
|
if (ISALPHA(c)) {
|
|
cmd[0] = TOUPPER(c);
|
|
c = *s++;
|
|
i--;
|
|
if (ISALPHA(c)) {
|
|
cmd[1] = TOUPPER(c);
|
|
c = *s++;
|
|
i--;
|
|
if (ISALPHA(c)) {
|
|
cmd[2] = TOUPPER(c);
|
|
c = *s++;
|
|
i--;
|
|
if (ISALPHA(c)) {
|
|
cmd[3] = TOUPPER(c);
|
|
c = *s++;
|
|
i--;
|
|
if ((c != ' ') && (c != '\r'))
|
|
goto bad_client_command;
|
|
} else if ((c != ' ') && (c != '\r'))
|
|
goto bad_client_command;
|
|
} else
|
|
goto bad_client_command;
|
|
} else
|
|
goto bad_client_command;
|
|
} else {
|
|
bad_client_command:
|
|
if (ippr_ftp_debug > 3)
|
|
printf("%s:bad:junk %d len %d/%d c 0x%x buf [%*.*s]\n",
|
|
"ippr_ftp_client_valid",
|
|
ftps->ftps_junk, (int)len, (int)i, c,
|
|
(int)len, (int)len, buf);
|
|
return FTPXY_JUNK_BAD;
|
|
}
|
|
|
|
for (; i; i--) {
|
|
pc = c;
|
|
c = *s++;
|
|
if ((pc == '\r') && (c == '\n')) {
|
|
cmd[4] = '\0';
|
|
if (!strcmp(cmd, "PASV"))
|
|
ftps->ftps_cmds = FTPXY_C_PASV;
|
|
else
|
|
ftps->ftps_cmds = 0;
|
|
return 0;
|
|
}
|
|
}
|
|
#if !defined(_KERNEL)
|
|
printf("ippr_ftp_client_valid:junk after cmd[%*.*s]\n",
|
|
(int)len, (int)len, buf);
|
|
#endif
|
|
return FTPXY_JUNK_EOL;
|
|
}
|
|
|
|
|
|
int ippr_ftp_server_valid(ftps, buf, len)
|
|
ftpside_t *ftps;
|
|
char *buf;
|
|
size_t len;
|
|
{
|
|
register char *s, c, pc;
|
|
register size_t i = len;
|
|
int cmd;
|
|
|
|
s = buf;
|
|
cmd = 0;
|
|
|
|
if (ftps->ftps_junk == FTPXY_JUNK_BAD)
|
|
return FTPXY_JUNK_BAD;
|
|
|
|
if (i < 5) {
|
|
if (ippr_ftp_debug > 3)
|
|
printf("ippr_ftp_servert_valid:i(%d) < 5\n", (int)i);
|
|
return 2;
|
|
}
|
|
|
|
c = *s++;
|
|
i--;
|
|
if (c == ' ') {
|
|
cmd = -1;
|
|
goto search_eol;
|
|
}
|
|
|
|
if (ISDIGIT(c)) {
|
|
cmd = (c - '0') * 100;
|
|
c = *s++;
|
|
i--;
|
|
if (ISDIGIT(c)) {
|
|
cmd += (c - '0') * 10;
|
|
c = *s++;
|
|
i--;
|
|
if (ISDIGIT(c)) {
|
|
cmd += (c - '0');
|
|
c = *s++;
|
|
i--;
|
|
if ((c != '-') && (c != ' '))
|
|
goto bad_server_command;
|
|
if (c == '-')
|
|
return FTPXY_JUNK_CONT;
|
|
} else
|
|
goto bad_server_command;
|
|
} else
|
|
goto bad_server_command;
|
|
} else {
|
|
bad_server_command:
|
|
if (ippr_ftp_debug > 3)
|
|
printf("%s:bad:junk %d len %d/%d c 0x%x buf [%*.*s]\n",
|
|
"ippr_ftp_server_valid",
|
|
ftps->ftps_junk, (int)len, (int)i,
|
|
c, (int)len, (int)len, buf);
|
|
if (ftps->ftps_junk == FTPXY_JUNK_CONT)
|
|
return FTPXY_JUNK_CONT;
|
|
return FTPXY_JUNK_BAD;
|
|
}
|
|
search_eol:
|
|
for (; i; i--) {
|
|
pc = c;
|
|
c = *s++;
|
|
if ((pc == '\r') && (c == '\n')) {
|
|
if (cmd == -1) {
|
|
if (ftps->ftps_junk == FTPXY_JUNK_CONT)
|
|
return FTPXY_JUNK_CONT;
|
|
} else {
|
|
ftps->ftps_cmds = cmd;
|
|
}
|
|
return FTPXY_JUNK_OK;
|
|
}
|
|
}
|
|
if (ippr_ftp_debug > 3)
|
|
printf("ippr_ftp_server_valid:junk after cmd[%*.*s]\n",
|
|
(int)len, (int)len, buf);
|
|
return FTPXY_JUNK_EOL;
|
|
}
|
|
|
|
|
|
int ippr_ftp_valid(ftp, side, buf, len)
|
|
ftpinfo_t *ftp;
|
|
int side;
|
|
char *buf;
|
|
size_t len;
|
|
{
|
|
ftpside_t *ftps;
|
|
int ret;
|
|
|
|
ftps = &ftp->ftp_side[side];
|
|
|
|
if (side == 0)
|
|
ret = ippr_ftp_client_valid(ftps, buf, len);
|
|
else
|
|
ret = ippr_ftp_server_valid(ftps, buf, len);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* For map rules, the following applies:
|
|
* rv == 0 for outbound processing,
|
|
* rv == 1 for inbound processing.
|
|
* For rdr rules, the following applies:
|
|
* rv == 0 for inbound processing,
|
|
* rv == 1 for outbound processing.
|
|
*/
|
|
int ippr_ftp_process(fin, nat, ftp, rv)
|
|
fr_info_t *fin;
|
|
nat_t *nat;
|
|
ftpinfo_t *ftp;
|
|
int rv;
|
|
{
|
|
int mlen, len, off, inc, i, sel, sel2, ok, ackoff, seqoff, retry;
|
|
char *rptr, *wptr, *s;
|
|
u_32_t thseq, thack;
|
|
ap_session_t *aps;
|
|
ftpside_t *f, *t;
|
|
tcphdr_t *tcp;
|
|
ip_t *ip;
|
|
mb_t *m;
|
|
|
|
m = fin->fin_m;
|
|
ip = fin->fin_ip;
|
|
tcp = (tcphdr_t *)fin->fin_dp;
|
|
off = (char *)tcp - (char *)ip + (TCP_OFF(tcp) << 2) + fin->fin_ipoff;
|
|
|
|
f = &ftp->ftp_side[rv];
|
|
t = &ftp->ftp_side[1 - rv];
|
|
thseq = ntohl(tcp->th_seq);
|
|
thack = ntohl(tcp->th_ack);
|
|
|
|
#ifdef __sgi
|
|
mlen = fin->fin_plen - off;
|
|
#else
|
|
mlen = MSGDSIZE(m) - off;
|
|
#endif
|
|
if (ippr_ftp_debug > 4)
|
|
printf("ippr_ftp_process: mlen %d\n", mlen);
|
|
|
|
if ((mlen == 0) && ((tcp->th_flags & TH_OPENING) == TH_OPENING)) {
|
|
f->ftps_seq[0] = thseq + 1;
|
|
t->ftps_seq[0] = thack;
|
|
return 0;
|
|
} else if (mlen < 0) {
|
|
return 0;
|
|
}
|
|
|
|
aps = nat->nat_aps;
|
|
|
|
sel = aps->aps_sel[1 - rv];
|
|
sel2 = aps->aps_sel[rv];
|
|
if (rv == 0) {
|
|
seqoff = aps->aps_seqoff[sel];
|
|
if (aps->aps_seqmin[sel] > seqoff + thseq)
|
|
seqoff = aps->aps_seqoff[!sel];
|
|
ackoff = aps->aps_ackoff[sel2];
|
|
if (aps->aps_ackmin[sel2] > ackoff + thack)
|
|
ackoff = aps->aps_ackoff[!sel2];
|
|
} else {
|
|
seqoff = aps->aps_ackoff[sel];
|
|
if (ippr_ftp_debug > 2)
|
|
printf("seqoff %d thseq %x ackmin %x\n", seqoff, thseq,
|
|
aps->aps_ackmin[sel]);
|
|
if (aps->aps_ackmin[sel] > seqoff + thseq)
|
|
seqoff = aps->aps_ackoff[!sel];
|
|
|
|
ackoff = aps->aps_seqoff[sel2];
|
|
if (ippr_ftp_debug > 2)
|
|
printf("ackoff %d thack %x seqmin %x\n", ackoff, thack,
|
|
aps->aps_seqmin[sel2]);
|
|
if (ackoff > 0) {
|
|
if (aps->aps_seqmin[sel2] > ackoff + thack)
|
|
ackoff = aps->aps_seqoff[!sel2];
|
|
} else {
|
|
if (aps->aps_seqmin[sel2] > thack)
|
|
ackoff = aps->aps_seqoff[!sel2];
|
|
}
|
|
}
|
|
if (ippr_ftp_debug > 2) {
|
|
printf("%s: %x seq %x/%d ack %x/%d len %d/%d off %d\n",
|
|
rv ? "IN" : "OUT", tcp->th_flags, thseq, seqoff,
|
|
thack, ackoff, mlen, fin->fin_plen, off);
|
|
printf("sel %d seqmin %x/%x offset %d/%d\n", sel,
|
|
aps->aps_seqmin[sel], aps->aps_seqmin[sel2],
|
|
aps->aps_seqoff[sel], aps->aps_seqoff[sel2]);
|
|
printf("sel %d ackmin %x/%x offset %d/%d\n", sel2,
|
|
aps->aps_ackmin[sel], aps->aps_ackmin[sel2],
|
|
aps->aps_ackoff[sel], aps->aps_ackoff[sel2]);
|
|
}
|
|
|
|
/*
|
|
* XXX - Ideally, this packet should get dropped because we now know
|
|
* that it is out of order (and there is no real danger in doing so
|
|
* apart from causing packets to go through here ordered).
|
|
*/
|
|
if (ippr_ftp_debug > 2) {
|
|
printf("rv %d t:seq[0] %x seq[1] %x %d/%d\n",
|
|
rv, t->ftps_seq[0], t->ftps_seq[1], seqoff, ackoff);
|
|
}
|
|
|
|
ok = 0;
|
|
if (t->ftps_seq[0] == 0) {
|
|
t->ftps_seq[0] = thack;
|
|
ok = 1;
|
|
} else {
|
|
if (ackoff == 0) {
|
|
if (t->ftps_seq[0] == thack)
|
|
ok = 1;
|
|
else if (t->ftps_seq[1] == thack) {
|
|
t->ftps_seq[0] = thack;
|
|
ok = 1;
|
|
}
|
|
} else {
|
|
if (t->ftps_seq[0] + ackoff == thack)
|
|
ok = 1;
|
|
else if (t->ftps_seq[0] == thack + ackoff)
|
|
ok = 1;
|
|
else if (t->ftps_seq[1] + ackoff == thack) {
|
|
t->ftps_seq[0] = thack - ackoff;
|
|
ok = 1;
|
|
} else if (t->ftps_seq[1] == thack + ackoff) {
|
|
t->ftps_seq[0] = thack - ackoff;
|
|
ok = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ippr_ftp_debug > 2) {
|
|
if (!ok)
|
|
printf("%s ok\n", "not");
|
|
}
|
|
|
|
if (!mlen) {
|
|
if (t->ftps_seq[0] + ackoff != thack) {
|
|
if (ippr_ftp_debug > 1) {
|
|
printf("%s:seq[0](%x) + (%x) != (%x)\n",
|
|
"ippr_ftp_process", t->ftps_seq[0],
|
|
ackoff, thack);
|
|
}
|
|
return APR_ERR(1);
|
|
}
|
|
|
|
if (ippr_ftp_debug > 2) {
|
|
printf("ippr_ftp_process:f:seq[0] %x seq[1] %x\n",
|
|
f->ftps_seq[0], f->ftps_seq[1]);
|
|
}
|
|
|
|
if (tcp->th_flags & TH_FIN) {
|
|
if (thseq == f->ftps_seq[1]) {
|
|
f->ftps_seq[0] = f->ftps_seq[1] - seqoff;
|
|
f->ftps_seq[1] = thseq + 1 - seqoff;
|
|
} else {
|
|
if (ippr_ftp_debug > 1) {
|
|
printf("FIN: thseq %x seqoff %d ftps_seq %x %x\n",
|
|
thseq, seqoff, f->ftps_seq[0], f->ftps_seq[1]);
|
|
}
|
|
return APR_ERR(1);
|
|
}
|
|
}
|
|
f->ftps_len = 0;
|
|
return 0;
|
|
}
|
|
|
|
ok = 0;
|
|
if ((thseq == f->ftps_seq[0]) || (thseq == f->ftps_seq[1])) {
|
|
ok = 1;
|
|
/*
|
|
* Retransmitted data packet.
|
|
*/
|
|
} else if ((thseq + mlen == f->ftps_seq[0]) ||
|
|
(thseq + mlen == f->ftps_seq[1])) {
|
|
ok = 1;
|
|
}
|
|
|
|
if (ok == 0) {
|
|
inc = thseq - f->ftps_seq[0];
|
|
if (ippr_ftp_debug > 1) {
|
|
printf("inc %d sel %d rv %d\n", inc, sel, rv);
|
|
printf("th_seq %x ftps_seq %x/%x\n",
|
|
thseq, f->ftps_seq[0], f->ftps_seq[1]);
|
|
printf("ackmin %x ackoff %d\n", aps->aps_ackmin[sel],
|
|
aps->aps_ackoff[sel]);
|
|
printf("seqmin %x seqoff %d\n", aps->aps_seqmin[sel],
|
|
aps->aps_seqoff[sel]);
|
|
}
|
|
|
|
return APR_ERR(1);
|
|
}
|
|
|
|
inc = 0;
|
|
rptr = f->ftps_rptr;
|
|
wptr = f->ftps_wptr;
|
|
f->ftps_seq[0] = thseq;
|
|
f->ftps_seq[1] = f->ftps_seq[0] + mlen;
|
|
f->ftps_len = mlen;
|
|
|
|
while (mlen > 0) {
|
|
len = MIN(mlen, sizeof(f->ftps_buf) - (wptr - rptr));
|
|
if (len == 0)
|
|
break;
|
|
COPYDATA(m, off, len, wptr);
|
|
mlen -= len;
|
|
off += len;
|
|
wptr += len;
|
|
|
|
whilemore:
|
|
if (ippr_ftp_debug > 3)
|
|
printf("%s:len %d/%d off %d wptr %lx junk %d [%*.*s]\n",
|
|
"ippr_ftp_process",
|
|
len, mlen, off, (u_long)wptr, f->ftps_junk,
|
|
len, len, rptr);
|
|
|
|
f->ftps_wptr = wptr;
|
|
if (f->ftps_junk != FTPXY_JUNK_OK) {
|
|
i = f->ftps_junk;
|
|
f->ftps_junk = ippr_ftp_valid(ftp, rv, rptr,
|
|
wptr - rptr);
|
|
|
|
if (ippr_ftp_debug > 5)
|
|
printf("%s:junk %d -> %d\n",
|
|
"ippr_ftp_process", i, f->ftps_junk);
|
|
|
|
if (f->ftps_junk == FTPXY_JUNK_BAD) {
|
|
if (wptr - rptr == sizeof(f->ftps_buf)) {
|
|
if (ippr_ftp_debug > 4)
|
|
printf("%s:full buffer\n",
|
|
"ippr_ftp_process");
|
|
f->ftps_rptr = f->ftps_buf;
|
|
f->ftps_wptr = f->ftps_buf;
|
|
rptr = f->ftps_rptr;
|
|
wptr = f->ftps_wptr;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
while ((f->ftps_junk == FTPXY_JUNK_OK) && (wptr > rptr)) {
|
|
len = wptr - rptr;
|
|
f->ftps_junk = ippr_ftp_valid(ftp, rv, rptr, len);
|
|
|
|
if (ippr_ftp_debug > 3) {
|
|
printf("%s=%d len %d rv %d ptr %lx/%lx ",
|
|
"ippr_ftp_valid",
|
|
f->ftps_junk, len, rv, (u_long)rptr,
|
|
(u_long)wptr);
|
|
printf("buf [%*.*s]\n", len, len, rptr);
|
|
}
|
|
|
|
if (f->ftps_junk == FTPXY_JUNK_OK) {
|
|
f->ftps_rptr = rptr;
|
|
if (rv)
|
|
inc += ippr_ftp_server(fin, ip, nat,
|
|
ftp, len);
|
|
else
|
|
inc += ippr_ftp_client(fin, ip, nat,
|
|
ftp, len);
|
|
rptr = f->ftps_rptr;
|
|
wptr = f->ftps_wptr;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Off to a bad start so lets just forget about using the
|
|
* ftp proxy for this connection.
|
|
*/
|
|
if ((f->ftps_cmds == 0) && (f->ftps_junk == FTPXY_JUNK_BAD)) {
|
|
/* f->ftps_seq[1] += inc; */
|
|
|
|
if (ippr_ftp_debug > 1)
|
|
printf("%s:cmds == 0 junk == 1\n",
|
|
"ippr_ftp_process");
|
|
return APR_ERR(2);
|
|
}
|
|
|
|
retry = 0;
|
|
if ((f->ftps_junk != FTPXY_JUNK_OK) && (rptr < wptr)) {
|
|
for (s = rptr; s < wptr; s++) {
|
|
if ((*s == '\r') && (s + 1 < wptr) &&
|
|
(*(s + 1) == '\n')) {
|
|
rptr = s + 2;
|
|
retry = 1;
|
|
if (f->ftps_junk != FTPXY_JUNK_CONT)
|
|
f->ftps_junk = FTPXY_JUNK_OK;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (rptr == wptr) {
|
|
rptr = wptr = f->ftps_buf;
|
|
} else {
|
|
/*
|
|
* Compact the buffer back to the start. The junk
|
|
* flag should already be set and because we're not
|
|
* throwing away any data, it is preserved from its
|
|
* current state.
|
|
*/
|
|
if (rptr > f->ftps_buf) {
|
|
bcopy(rptr, f->ftps_buf, wptr - rptr);
|
|
wptr -= rptr - f->ftps_buf;
|
|
rptr = f->ftps_buf;
|
|
}
|
|
}
|
|
f->ftps_rptr = rptr;
|
|
f->ftps_wptr = wptr;
|
|
if (retry)
|
|
goto whilemore;
|
|
}
|
|
|
|
/* f->ftps_seq[1] += inc; */
|
|
if (tcp->th_flags & TH_FIN)
|
|
f->ftps_seq[1]++;
|
|
if (ippr_ftp_debug > 3) {
|
|
#ifdef __sgi
|
|
mlen = fin->fin_plen;
|
|
#else
|
|
mlen = MSGDSIZE(m);
|
|
#endif
|
|
mlen -= off;
|
|
printf("ftps_seq[1] = %x inc %d len %d\n",
|
|
f->ftps_seq[1], inc, mlen);
|
|
}
|
|
|
|
f->ftps_rptr = rptr;
|
|
f->ftps_wptr = wptr;
|
|
return APR_INC(inc);
|
|
}
|
|
|
|
|
|
int ippr_ftp_out(fin, aps, nat)
|
|
fr_info_t *fin;
|
|
ap_session_t *aps;
|
|
nat_t *nat;
|
|
{
|
|
ftpinfo_t *ftp;
|
|
int rev;
|
|
|
|
ftp = aps->aps_data;
|
|
if (ftp == NULL)
|
|
return 0;
|
|
|
|
rev = (nat->nat_dir == NAT_OUTBOUND) ? 0 : 1;
|
|
if (ftp->ftp_side[1 - rev].ftps_ifp == NULL)
|
|
ftp->ftp_side[1 - rev].ftps_ifp = fin->fin_ifp;
|
|
|
|
return ippr_ftp_process(fin, nat, ftp, rev);
|
|
}
|
|
|
|
|
|
int ippr_ftp_in(fin, aps, nat)
|
|
fr_info_t *fin;
|
|
ap_session_t *aps;
|
|
nat_t *nat;
|
|
{
|
|
ftpinfo_t *ftp;
|
|
int rev;
|
|
|
|
ftp = aps->aps_data;
|
|
if (ftp == NULL)
|
|
return 0;
|
|
|
|
rev = (nat->nat_dir == NAT_OUTBOUND) ? 0 : 1;
|
|
if (ftp->ftp_side[rev].ftps_ifp == NULL)
|
|
ftp->ftp_side[rev].ftps_ifp = fin->fin_ifp;
|
|
|
|
return ippr_ftp_process(fin, nat, ftp, 1 - rev);
|
|
}
|
|
|
|
|
|
/*
|
|
* ippr_ftp_atoi - implement a version of atoi which processes numbers in
|
|
* pairs separated by commas (which are expected to be in the range 0 - 255),
|
|
* returning a 16 bit number combining either side of the , as the MSB and
|
|
* LSB.
|
|
*/
|
|
u_short ippr_ftp_atoi(ptr)
|
|
char **ptr;
|
|
{
|
|
register char *s = *ptr, c;
|
|
register u_char i = 0, j = 0;
|
|
|
|
while (((c = *s++) != '\0') && ISDIGIT(c)) {
|
|
i *= 10;
|
|
i += c - '0';
|
|
}
|
|
if (c != ',') {
|
|
*ptr = NULL;
|
|
return 0;
|
|
}
|
|
while (((c = *s++) != '\0') && ISDIGIT(c)) {
|
|
j *= 10;
|
|
j += c - '0';
|
|
}
|
|
*ptr = s;
|
|
i &= 0xff;
|
|
j &= 0xff;
|
|
return (i << 8) | j;
|
|
}
|
|
|
|
|
|
int ippr_ftp_epsv(fin, ip, nat, f, dlen)
|
|
fr_info_t *fin;
|
|
ip_t *ip;
|
|
nat_t *nat;
|
|
ftpside_t *f;
|
|
int dlen;
|
|
{
|
|
char newbuf[IPF_FTPBUFSZ];
|
|
char *s;
|
|
u_short ap = 0;
|
|
|
|
#define EPSV_REPLEN 33
|
|
/*
|
|
* Check for EPSV reply message.
|
|
*/
|
|
if (dlen < IPF_MIN229LEN)
|
|
return (0);
|
|
else if (strncmp(f->ftps_rptr,
|
|
"229 Entering Extended Passive Mode", EPSV_REPLEN))
|
|
return (0);
|
|
|
|
/*
|
|
* Skip the EPSV command + space
|
|
*/
|
|
s = f->ftps_rptr + 33;
|
|
while (*s && !ISDIGIT(*s))
|
|
s++;
|
|
|
|
/*
|
|
* As per RFC 2428, there are no addres components in the EPSV
|
|
* response. So we'll go straight to getting the port.
|
|
*/
|
|
while (*s && ISDIGIT(*s)) {
|
|
ap *= 10;
|
|
ap += *s++ - '0';
|
|
}
|
|
|
|
if (!*s)
|
|
return 0;
|
|
|
|
if (*s == '|')
|
|
s++;
|
|
if (*s == ')')
|
|
s++;
|
|
if (*s == '\n')
|
|
s--;
|
|
/*
|
|
* check for CR-LF at the end.
|
|
*/
|
|
if ((*s == '\r') && (*(s + 1) == '\n')) {
|
|
s += 2;
|
|
} else
|
|
return 0;
|
|
|
|
#if defined(SNPRINTF) && defined(_KERNEL)
|
|
SNPRINTF(newbuf, sizeof(newbuf), "%s (|||%u|)\r\n",
|
|
"229 Entering Extended Passive Mode", ap);
|
|
#else
|
|
(void) sprintf(newbuf, "%s (|||%u|)\r\n",
|
|
"229 Entering Extended Passive Mode", ap);
|
|
#endif
|
|
|
|
return ippr_ftp_pasvreply(fin, ip, nat, f, (u_int)ap, newbuf, s,
|
|
ip->ip_src.s_addr);
|
|
}
|