You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
388 lines
9.3 KiB
388 lines
9.3 KiB
/**
|
|
* 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);
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
static int APP_CC
|
|
xrdp_iso_negotiate_security(struct xrdp_iso *self) {
|
|
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;
|
|
}
|
|
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 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* 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 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 */
|
|
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 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;
|
|
}
|