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xrdp/libxrdp/xrdp_iso.c

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9.6 KiB
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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2013
* Copyright (C) Idan Freiberg 2013
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* iso layer
*/
#include "libxrdp.h"
/*****************************************************************************/
struct xrdp_iso *APP_CC
xrdp_iso_create(struct xrdp_mcs *owner, struct trans *trans)
{
struct xrdp_iso *self;
DEBUG((" in xrdp_iso_create"));
self = (struct xrdp_iso *)g_malloc(sizeof(struct xrdp_iso), 1);
self->mcs_layer = owner;
self->trans = trans;
DEBUG((" out xrdp_iso_create"));
return self;
}
/*****************************************************************************/
void APP_CC
xrdp_iso_delete(struct xrdp_iso *self)
{
if (self == 0)
{
return;
}
g_free(self);
}
/*****************************************************************************/
/* returns error */
static int APP_CC
xrdp_iso_recv_rdpnegreq(struct xrdp_iso *self, struct stream *s)
{
int flags;
int len;
DEBUG((" in xrdp_iso_recv_rdpnegreq"));
in_uint8(s, flags);
if (flags != 0x0 && flags != 0x8 && flags != 0x1)
{
DEBUG((" xrdp_iso_recv_rdpnegreq: flags: %x",flags));
return 1;
}
in_uint16_le(s, len);
if (len != 8) // fixed length
{
DEBUG((" xrdp_iso_recv_rdpnegreq: length: %x",len));
return 1;
}
in_uint32_le(s, self->requestedProtocol);
//TODO: think of protocol verification logic
// if (requestedProtocol != PROTOCOL_RDP || PROTOCOL_SSL || PROTOCOL_HYBRID || PROTOCOL_HYBRID_EX)
// {
// DEBUG((" xrdp_iso_recv_rdpnegreq: wrong requestedProtocol: %x",requestedProtocol));
// return 1;
// }
DEBUG((" out xrdp_iso_recv_rdpnegreq"));
return 0;
}
/*****************************************************************************/
/* returns error */
static int APP_CC
xrdp_iso_recv_msg(struct xrdp_iso *self, struct stream *s, int *code, int *len)
{
int ver; // TPKT Version
int plen; // TPKT PacketLength
*code = 0; // X.224 Packet Type
*len = 0; // X.224 Length Indicator
if (s != self->trans->in_s)
{
g_writeln("xrdp_iso_recv_msg error logic");
}
in_uint8(s, ver);
if (ver != 3)
{
g_writeln("xrdp_iso_recv_msg: bad ver");
g_hexdump(s->data, 4);
return 1;
}
in_uint8s(s, 1);
in_uint16_be(s, plen);
if (plen < 4)
{
return 1;
}
if (!s_check_rem(s, 2))
{
return 1;
}
in_uint8(s, *len);
in_uint8(s, *code);
if (*code == ISO_PDU_DT)
{
if (!s_check_rem(s, 1))
{
return 1;
}
in_uint8s(s, 1);
}
else
{
if (!s_check_rem(s, 5))
{
return 1;
}
in_uint8s(s, 5);
}
return 0;
}
/*****************************************************************************/
/* returns error */
int APP_CC
xrdp_iso_recv(struct xrdp_iso *self, struct stream *s)
{
int code;
int len;
DEBUG((" in xrdp_iso_recv"));
if (xrdp_iso_recv_msg(self, s, &code, &len) != 0)
{
DEBUG((" out xrdp_iso_recv xrdp_iso_recv_msg return non zero"));
return 1;
}
if (code != ISO_PDU_DT || len != 2)
{
DEBUG((" out xrdp_iso_recv code != ISO_PDU_DT or length != 2"));
return 1;
}
DEBUG((" out xrdp_iso_recv"));
return 0;
}
/*****************************************************************************/
static int APP_CC
xrdp_iso_send_rdpnegrsp(struct xrdp_iso *self, struct stream *s, int code)
{
init_stream(s, 8192 * 4); /* 32 KB */
/* TPKT HEADER - 4 bytes */
out_uint8(s, 3); /* version */
out_uint8(s, 0); /* RESERVED */
if (self->selectedProtocol != -1)
{
out_uint16_be(s, 19); /* length */ //rdp negotiation happens.
}
else
{
out_uint16_be(s, 11); /* length */ //rdp negotiation doesn't happen.
}
/* ISO LAYER - X.224 - 7 bytes*/
if (self->selectedProtocol != -1)
{
out_uint8(s, 14); /* length */
}
else
{
out_uint8(s, 6); /* length */
}
out_uint8(s, code); /* SHOULD BE 0xD for CC */
out_uint16_be(s, 0);
out_uint16_be(s, 0x1234);
out_uint8(s, 0);
if (self->selectedProtocol != -1)
{
/* RDP_NEG_RSP - 8 bytes*/
out_uint8(s, RDP_NEG_RSP);
out_uint8(s, EXTENDED_CLIENT_DATA_SUPPORTED); /* flags */
out_uint16_le(s, 8); /* fixed length */
out_uint32_le(s, self->selectedProtocol); /* selected protocol */
}
s_mark_end(s);
if (trans_force_write_s(self->trans, s) != 0)
{
return 1;
}
return 0;
}
/*****************************************************************************/
static int APP_CC
xrdp_iso_send_rdpnegfailure(struct xrdp_iso *self, struct stream *s, int code, int failureCode)
{
init_stream(s, 8192 * 4); /* 32 KB */
/* TPKT HEADER - 4 bytes */
out_uint8(s, 3); /* version */
out_uint8(s, 0); /* RESERVED */
out_uint16_be(s, 19); /* length */
/* ISO LAYER - X.224 - 7 bytes*/
out_uint8(s, 14); /* length */
out_uint8(s, code); /* SHOULD BE 0xD for CC */
out_uint16_be(s, 0);
out_uint16_be(s, 0x1234);
out_uint8(s, 0);
/* RDP_NEG_FAILURE - 8 bytes*/
out_uint8(s, RDP_NEG_FAILURE);
out_uint8(s, 0); /* no flags available */
out_uint16_le(s, 8); /* fixed length */
out_uint32_le(s, failureCode); /* failure code */
s_mark_end(s);
if (trans_force_write_s(self->trans, s) != 0)
{
return 1;
}
return 0;
}
/*****************************************************************************/
static int APP_CC
xrdp_iso_send_nego(struct xrdp_iso *self)
{
struct stream *s;
make_stream(s);
init_stream(s, 8192);
//TODO: negotiation logic here.
if (self->requestedProtocol != PROTOCOL_RDP)
{
// Send RDP_NEG_FAILURE back to client
if (xrdp_iso_send_rdpnegfailure(self, s, ISO_PDU_CC,
SSL_NOT_ALLOWED_BY_SERVER) != 0)
{
free_stream(s);
return 1;
}
}
else
{
self->selectedProtocol = PROTOCOL_RDP;
// Send RDP_NEG_RSP back to client
if (xrdp_iso_send_rdpnegrsp(self, s, ISO_PDU_CC) != 0)
{
free_stream(s);
return 1;
}
}
free_stream(s);
return 0;
}
/*****************************************************************************/
/* returns error */
int APP_CC
xrdp_iso_incoming(struct xrdp_iso *self)
{
int code;
int len;
int cookie_index;
int cc_type;
char text[256];
char *pend;
struct stream *s;
DEBUG((" in xrdp_iso_incoming"));
s = libxrdp_force_read(self->trans);
if (s == 0)
{
return 1;
}
if (xrdp_iso_recv_msg(self, s, &code, &len) != 0)
{
DEBUG((" in xrdp_iso_recv_msg error!!"));
return 1;
}
if ((code != ISO_PDU_CR) || (len < 6))
{
return 1;
}
self->selectedProtocol = -1;
self->requestedProtocol = PROTOCOL_RDP;
pend = s->p + (len - 6);
cookie_index = 0;
while (s->p < pend)
{
in_uint8(s, cc_type);
switch (cc_type)
{
default:
break;
case RDP_NEG_REQ: /* rdpNegReq 1 */
if (xrdp_iso_recv_rdpnegreq(self, s) != 0)
{
return 1;
}
break;
case RDP_CORRELATION_INFO: /* rdpCorrelationInfo 6 */
// TODO
in_uint8s(s, 1 + 2 + 16 + 16);
break;
case 'C': /* Cookie routingToken */
while (s->p < pend)
{
text[cookie_index] = cc_type;
cookie_index++;
if ((s->p[0] == 0x0D) && (s->p[1] == 0x0A))
{
in_uint8s(s, 2);
text[cookie_index] = 0;
cookie_index = 0;
break;
}
in_uint8(s, cc_type);
}
break;
}
}
if (xrdp_iso_send_nego(self) != 0)
{
return 1;
}
DEBUG((" out xrdp_iso_incoming"));
return 0;
}
/*****************************************************************************/
/* returns error */
int APP_CC
xrdp_iso_init(struct xrdp_iso *self, struct stream *s)
{
init_stream(s, 8192 * 4); /* 32 KB */
s_push_layer(s, iso_hdr, 7);
return 0;
}
/*****************************************************************************/
/* returns error */
int APP_CC
xrdp_iso_send(struct xrdp_iso *self, struct stream *s)
{
int len;
DEBUG((" in xrdp_iso_send"));
s_pop_layer(s, iso_hdr);
len = (int)(s->end - s->p);
out_uint8(s, 3);
out_uint8(s, 0);
out_uint16_be(s, len);
out_uint8(s, 2);
out_uint8(s, ISO_PDU_DT);
out_uint8(s, 0x80);
if (trans_force_write_s(self->trans, s) != 0)
{
return 1;
}
DEBUG((" out xrdp_iso_send"));
return 0;
}
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