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xrdp/libxrdp/xrdp_iso.c
Jay Sorg 69a551cdf7 libxrdp: indent, no logic change
2014-12-16 12:20:57 -08:00

400 lines
9.7 KiB
C
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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2014
* Copyright (C) Idan Freiberg 2013-2014
*
* 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_negotiate_security(struct xrdp_iso *self)
{
int rv = 0;
int server_security_layer = self->mcs_layer->sec_layer->rdp_layer->client_info.security_layer;
self->selectedProtocol = server_security_layer;
switch (server_security_layer)
{
case PROTOCOL_RDP:
self->rdpNegData = 0; /* no need to send rdp_neg_data back to client */
break;
case PROTOCOL_SSL:
if (self->requestedProtocol & PROTOCOL_SSL)
{
self->selectedProtocol = PROTOCOL_SSL;
}
else
{
self->failureCode = SSL_REQUIRED_BY_SERVER;
rv = 1; /* error */
}
break;
case PROTOCOL_HYBRID:
case PROTOCOL_HYBRID_EX:
default:
if (self->requestedProtocol & PROTOCOL_SSL)
{
/* thats a patch since we don't support CredSSP for now */
self->selectedProtocol = PROTOCOL_SSL;
}
else
{
self->selectedProtocol = PROTOCOL_RDP;
}
break;
}
DEBUG(("xrdp_iso_negotiate_security: server security layer %d , client security layer %d",
self->selectedProtocol, self->requestedProtocol));
return rv;
}
/*****************************************************************************/
/* returns error */
static int APP_CC
xrdp_iso_process_rdp_neg_req(struct xrdp_iso *self, struct stream *s)
{
int flags;
int len;
in_uint8(s, flags);
if (flags != 0x0 && flags != 0x8 && flags != 0x1)
{
DEBUG(("xrdp_iso_process_rdpNegReq: error, flags: %x",flags));
return 1;
}
in_uint16_le(s, len);
if (len != 8)
{
DEBUG(("xrdp_iso_process_rdpNegReq: error, length: %x",len));
return 1;
}
in_uint32_le(s, self->requestedProtocol);
if (self->requestedProtocol > 0xb)
{
DEBUG(("xrdp_iso_process_rdpNegReq: error, requestedProtocol: %x",
self->requestedProtocol));
return 1;
}
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;
int plen;
*code = 0;
*len = 0;
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_cc(struct xrdp_iso *self)
{
struct stream *s;
char *holdp;
char *len_ptr;
char *len_indicator_ptr;
int len;
int len_indicator;
make_stream(s);
init_stream(s, 8192);
holdp = s->p;
/* tpkt */
out_uint8(s, 3); /* version */
out_uint8(s, 0); /* pad */
len_ptr = s->p;
out_uint16_be(s, 0); /* length, set later */
/* iso */
len_indicator_ptr = s->p;
out_uint8(s, 0); /* length indicator, set later */
out_uint8(s, ISO_PDU_CC); /* Connection Confirm PDU */
out_uint16_be(s, 0);
out_uint16_be(s, 0x1234);
out_uint8(s, 0);
/* rdpNegData */
if (self->rdpNegData)
{
if (self->failureCode)
{
out_uint8(s, RDP_NEG_FAILURE);
out_uint8(s, 0); /* no flags */
out_uint16_le(s, 8); /* must be 8 */
out_uint32_le(s, self->failureCode); /* failure code */
}
else
{
out_uint8(s, RDP_NEG_RSP);
//TODO: hardcoded flags
out_uint8(s, EXTENDED_CLIENT_DATA_SUPPORTED); /* flags */
out_uint16_le(s, 8); /* must be 8 */
out_uint32_le(s, self->selectedProtocol); /* selected protocol */
}
}
s_mark_end(s);
len = (int) (s->end - holdp);
len_indicator = (int) (s->end - len_indicator_ptr) - 1;
len_ptr[0] = len >> 8;
len_ptr[1] = len;
len_indicator_ptr[0] = len_indicator;
if (trans_force_write_s(self->trans, s) != 0)
{
free_stream(s);
return 1;
}
free_stream(s);
return 0;
}
/*****************************************************************************/
/* returns error */
int APP_CC
xrdp_iso_incoming(struct xrdp_iso *self)
{
int rv = 0;
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)
{
g_writeln("xrdp_iso_incoming: xrdp_iso_recv_msg returned non zero");
return 1;
}
if ((code != ISO_PDU_CR) || (len < 6))
{
return 1;
}
/* process connection request */
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 */
self->rdpNegData = 1;
if (xrdp_iso_process_rdp_neg_req(self, s) != 0)
{
g_writeln("xrdp_iso_incoming: xrdp_iso_process_rdpNegReq returned non zero");
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;
}
}
/* negotiate client-server security layer */
rv = xrdp_iso_negotiate_security(self);
/* send connection confirm back to client */
if (xrdp_iso_send_cc(self) != 0)
{
g_writeln("xrdp_iso_incoming: xrdp_iso_send_cc returned non zero");
return 1;
}
DEBUG((" out xrdp_iso_incoming"));
return rv;
}
/*****************************************************************************/
/* 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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