ipfilter: MSN RPC proxy is not complete

The MSN RPC proxy is incomplete and does not do any address
translation. Remove it.

MFC after:	1 week
This commit is contained in:
Cy Schubert 2021-12-15 16:08:11 -08:00
parent 5c154c6b6b
commit c610426c4d

View File

@ -1,328 +0,0 @@
/* $FreeBSD$ */
/*
* Copyright (C) 2000-2003 by Darren Reed
*
* See the IPFILTER.LICENCE file for details on licencing.
*
* Simple DCE transparent proxy for MSN RPC.
*
* ******* NOTE: THIS PROXY DOES NOT DO ADDRESS TRANSLATION ********
*
* Id: ip_msnrpc_pxy.c,v 2.17.2.1 2005/02/04 10:22:55 darrenr Exp
*/
#define IPF_MSNRPC_PROXY
#define IPF_MINMSNRPCLEN 24
#define IPF_MSNRPCSKIP (2 + 19 + 2 + 2 + 2 + 19 + 2 + 2)
typedef struct msnrpchdr {
u_char mrh_major; /* major # == 5 */
u_char mrh_minor; /* minor # == 0 */
u_char mrh_type;
u_char mrh_flags;
u_32_t mrh_endian;
u_short mrh_dlen; /* data size */
u_short mrh_alen; /* authentication length */
u_32_t mrh_cid; /* call identifier */
u_32_t mrh_hint; /* allocation hint */
u_short mrh_ctxt; /* presentation context hint */
u_char mrh_ccnt; /* cancel count */
u_char mrh_ans;
} msnrpchdr_t;
int ippr_msnrpc_init(void);
void ippr_msnrpc_fini(void);
int ippr_msnrpc_new(fr_info_t *, ap_session_t *, nat_t *);
int ippr_msnrpc_out(fr_info_t *, ap_session_t *, nat_t *);
int ippr_msnrpc_in(fr_info_t *, ap_session_t *, nat_t *);
int ippr_msnrpc_check(ip_t *, msnrpchdr_t *);
static frentry_t msnfr;
int msn_proxy_init = 0;
/*
* Initialize local structures.
*/
int ippr_msnrpc_init()
{
bzero((char *)&msnfr, sizeof(msnfr));
msnfr.fr_ref = 1;
msnfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
MUTEX_INIT(&msnfr.fr_lock, "MSN RPC proxy rule lock");
msn_proxy_init = 1;
return 0;
}
void ippr_msnrpc_fini()
{
if (msn_proxy_init == 1) {
MUTEX_DESTROY(&msnfr.fr_lock);
msn_proxy_init = 0;
}
}
int ippr_msnrpc_new(fin, aps, nat)
fr_info_t *fin;
ap_session_t *aps;
nat_t *nat;
{
msnrpcinfo_t *mri;
KMALLOC(mri, msnrpcinfo_t *);
if (mri == NULL)
return -1;
aps->aps_data = mri;
aps->aps_psiz = sizeof(msnrpcinfo_t);
bzero((char *)mri, sizeof(*mri));
mri->mri_cmd[0] = 0xff;
mri->mri_cmd[1] = 0xff;
return 0;
}
int ippr_msnrpc_check(ip, mrh)
ip_t *ip;
msnrpchdr_t *mrh;
{
if (mrh->mrh_major != 5)
return -1;
if (mrh->mrh_minor != 0)
return -1;
if (mrh->mrh_alen != 0)
return -1;
if (mrh->mrh_endian == 0x10) {
/* Both gateway and packet match endian */
if (mrh->mrh_dlen > ip->ip_len)
return -1;
if (mrh->mrh_type == 0 || mrh->mrh_type == 2)
if (mrh->mrh_hint > ip->ip_len)
return -1;
} else if (mrh->mrh_endian == 0x10000000) {
/* XXX - Endian mismatch - should be swapping! */
return -1;
} else {
return -1;
}
return 0;
}
int ippr_msnrpc_out(fin, ip, aps, nat)
fr_info_t *fin;
ip_t *ip;
ap_session_t *aps;
nat_t *nat;
{
msnrpcinfo_t *mri;
msnrpchdr_t *mrh;
tcphdr_t *tcp;
int dlen;
mri = aps->aps_data;
if (mri == NULL)
return 0;
tcp = (tcphdr_t *)fin->fin_dp;
dlen = fin->fin_dlen - (TCP_OFF(tcp) << 2);
if (dlen < IPF_MINMSNRPCLEN)
return 0;
mrh = (msnrpchdr_t *)((char *)tcp + (TCP_OFF(tcp) << 2));
if (ippr_msnrpc_check(ip, mrh))
return 0;
mri->mri_valid++;
switch (mrh->mrh_type)
{
case 0x0b : /* BIND */
case 0x00 : /* REQUEST */
break;
case 0x0c : /* BIND ACK */
case 0x02 : /* RESPONSE */
default:
return 0;
}
mri->mri_cmd[1] = mrh->mrh_type;
return 0;
}
int ippr_msnrpc_in(fin, ip, aps, nat)
fr_info_t *fin;
ip_t *ip;
ap_session_t *aps;
nat_t *nat;
{
tcphdr_t *tcp, tcph, *tcp2 = &tcph;
int dlen, sz, sz2, i;
msnrpcinfo_t *mri;
msnrpchdr_t *mrh;
fr_info_t fi;
u_short len;
char *s;
mri = aps->aps_data;
if (mri == NULL)
return 0;
tcp = (tcphdr_t *)fin->fin_dp;
dlen = fin->fin_dlen - (TCP_OFF(tcp) << 2);
if (dlen < IPF_MINMSNRPCLEN)
return 0;
mrh = (msnrpchdr_t *)((char *)tcp + (TCP_OFF(tcp) << 2));
if (ippr_msnrpc_check(ip, mrh))
return 0;
mri->mri_valid++;
switch (mrh->mrh_type)
{
case 0x0c : /* BIND ACK */
if (mri->mri_cmd[1] != 0x0b)
return 0;
break;
case 0x02 : /* RESPONSE */
if (mri->mri_cmd[1] != 0x00)
return 0;
break;
case 0x0b : /* BIND */
case 0x00 : /* REQUEST */
default:
return 0;
}
mri->mri_cmd[0] = mrh->mrh_type;
dlen -= sizeof(*mrh);
/*
* Only processes RESPONSE's
*/
if (mrh->mrh_type != 0x02)
return 0;
/*
* Skip over some bytes...what are these really ?
*/
if (dlen <= 44)
return 0;
s = (char *)(mrh + 1) + 20;
dlen -= 20;
bcopy(s, (char *)&len, sizeof(len));
if (len == 1) {
s += 20;
dlen -= 20;
} else if (len == 2) {
s += 24;
dlen -= 24;
} else
return 0;
if (dlen <= 10)
return 0;
dlen -= 10;
bcopy(s, (char *)&sz, sizeof(sz));
s += sizeof(sz);
bcopy(s, (char *)&sz2, sizeof(sz2));
s += sizeof(sz2);
if (sz2 != sz)
return 0;
if (sz > dlen)
return 0;
if (*s++ != 5)
return 0;
if (*s++ != 0)
return 0;
sz -= IPF_MSNRPCSKIP;
s += IPF_MSNRPCSKIP;
dlen -= IPF_MSNRPCSKIP;
do {
if (sz < 7 || dlen < 7)
break;
bcopy(s, (char *)&len, sizeof(len));
if (dlen < len)
break;
if (sz < len)
break;
if (len != 1)
break;
sz -= 3;
i = *(s + 2);
s += 3;
dlen -= 3;
bcopy(s, (char *)&len, sizeof(len));
if (dlen < len)
break;
if (sz < len)
break;
s += sizeof(len);
switch (i)
{
case 7 :
if (len == 2) {
bcopy(s, (char *)&mri->mri_rport, 2);
mri->mri_flags |= 1;
}
break;
case 9 :
if (len == 4) {
bcopy(s, (char *)&mri->mri_raddr, 4);
mri->mri_flags |= 2;
}
break;
default :
break;
}
sz -= len;
s += len;
dlen -= len;
} while (sz > 0);
if (mri->mri_flags == 3) {
int slen;
bcopy((char *)fin, (char *)&fi, sizeof(fi));
bzero((char *)tcp2, sizeof(*tcp2));
slen = ip->ip_len;
ip->ip_len = fin->fin_hlen + sizeof(*tcp2);
bcopy((char *)fin, (char *)&fi, sizeof(fi));
bzero((char *)tcp2, sizeof(*tcp2));
tcp2->th_win = htons(8192);
TCP_OFF_A(tcp2, 5);
fi.fin_data[0] = htons(mri->mri_rport);
tcp2->th_sport = mri->mri_rport;
fi.fin_data[1] = 0;
tcp2->th_dport = 0;
fi.fin_state = NULL;
fi.fin_nat = NULL;
fi.fin_dlen = sizeof(*tcp2);
fi.fin_plen = fi.fin_hlen + sizeof(*tcp2);
fi.fin_dp = (char *)tcp2;
fi.fin_fi.fi_daddr = ip->ip_dst.s_addr;
fi.fin_fi.fi_saddr = mri->mri_raddr.s_addr;
if (!fi.fin_fr)
fi.fin_fr = &msnfr;
if (fr_stlookup(&fi, NULL, NULL)) {
RWLOCK_EXIT(&ipf_state);
} else {
(void) fr_addstate(&fi, NULL, SI_W_DPORT|SI_CLONE);
if (fi.fin_state != NULL)
fr_statederef(&fi, (ipstate_t **)&fi.fin_state);
}
ip->ip_len = slen;
}
mri->mri_flags = 0;
return 0;
}