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400 lines
9.7 KiB
400 lines
9.7 KiB
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2014
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* Copyright (C) Idan Freiberg 2013-2014
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* iso layer
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*/
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#include "libxrdp.h"
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/*****************************************************************************/
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struct xrdp_iso *
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APP_CC
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xrdp_iso_create(struct xrdp_mcs *owner, struct trans *trans)
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{
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struct xrdp_iso *self;
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DEBUG((" in xrdp_iso_create"));
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self = (struct xrdp_iso *) g_malloc(sizeof(struct xrdp_iso), 1);
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self->mcs_layer = owner;
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self->trans = trans;
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DEBUG((" out xrdp_iso_create"));
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return self;
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}
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/*****************************************************************************/
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void APP_CC
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xrdp_iso_delete(struct xrdp_iso *self)
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{
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if (self == 0)
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{
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return;
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}
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g_free(self);
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_iso_negotiate_security(struct xrdp_iso *self)
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{
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int rv = 0;
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int server_security_layer = self->mcs_layer->sec_layer->rdp_layer->client_info.security_layer;
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self->selectedProtocol = server_security_layer;
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switch (server_security_layer)
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{
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case PROTOCOL_RDP:
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self->rdpNegData = 0; /* no need to send rdp_neg_data back to client */
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break;
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case PROTOCOL_SSL:
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if (self->requestedProtocol & PROTOCOL_SSL)
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{
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self->selectedProtocol = PROTOCOL_SSL;
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}
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else
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{
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self->failureCode = SSL_REQUIRED_BY_SERVER;
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rv = 1; /* error */
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}
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break;
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case PROTOCOL_HYBRID:
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case PROTOCOL_HYBRID_EX:
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default:
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if (self->requestedProtocol & PROTOCOL_SSL)
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{
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/* thats a patch since we don't support CredSSP for now */
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self->selectedProtocol = PROTOCOL_SSL;
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}
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else
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{
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self->selectedProtocol = PROTOCOL_RDP;
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}
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break;
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}
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DEBUG(("xrdp_iso_negotiate_security: server security layer %d , client security layer %d",
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self->selectedProtocol, self->requestedProtocol));
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return rv;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_iso_process_rdp_neg_req(struct xrdp_iso *self, struct stream *s)
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{
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int flags;
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int len;
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in_uint8(s, flags);
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if (flags != 0x0 && flags != 0x8 && flags != 0x1)
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{
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DEBUG(("xrdp_iso_process_rdpNegReq: error, flags: %x",flags));
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return 1;
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}
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in_uint16_le(s, len);
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if (len != 8)
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{
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DEBUG(("xrdp_iso_process_rdpNegReq: error, length: %x",len));
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return 1;
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}
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in_uint32_le(s, self->requestedProtocol);
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if (self->requestedProtocol > 0xb)
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{
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DEBUG(("xrdp_iso_process_rdpNegReq: error, requestedProtocol: %x",
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self->requestedProtocol));
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return 1;
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}
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_iso_recv_msg(struct xrdp_iso *self, struct stream *s, int *code, int *len)
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{
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int ver;
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int plen;
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*code = 0;
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*len = 0;
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if (s != self->trans->in_s)
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{
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g_writeln("xrdp_iso_recv_msg error logic");
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}
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in_uint8(s, ver);
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if (ver != 3)
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{
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g_writeln("xrdp_iso_recv_msg: bad ver");
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g_hexdump(s->data, 4);
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return 1;
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}
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in_uint8s(s, 1);
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in_uint16_be(s, plen);
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if (plen < 4)
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{
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return 1;
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}
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if (!s_check_rem(s, 2))
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{
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return 1;
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}
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in_uint8(s, *len);
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in_uint8(s, *code);
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if (*code == ISO_PDU_DT)
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{
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if (!s_check_rem(s, 1))
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{
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return 1;
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}
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in_uint8s(s, 1);
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}
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else
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{
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if (!s_check_rem(s, 5))
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{
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return 1;
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}
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in_uint8s(s, 5);
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}
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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int APP_CC
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xrdp_iso_recv(struct xrdp_iso *self, struct stream *s)
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{
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int code;
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int len;
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DEBUG((" in xrdp_iso_recv"));
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if (xrdp_iso_recv_msg(self, s, &code, &len) != 0)
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{
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DEBUG((" out xrdp_iso_recv xrdp_iso_recv_msg return non zero"));
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return 1;
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}
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if (code != ISO_PDU_DT || len != 2)
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{
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DEBUG((" out xrdp_iso_recv code != ISO_PDU_DT or length != 2"));
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return 1;
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}
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DEBUG((" out xrdp_iso_recv"));
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return 0;
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}
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/*****************************************************************************/
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static int APP_CC
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xrdp_iso_send_cc(struct xrdp_iso *self)
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{
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struct stream *s;
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char *holdp;
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char *len_ptr;
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char *len_indicator_ptr;
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int len;
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int len_indicator;
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make_stream(s);
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init_stream(s, 8192);
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holdp = s->p;
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/* tpkt */
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out_uint8(s, 3); /* version */
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out_uint8(s, 0); /* pad */
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len_ptr = s->p;
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out_uint16_be(s, 0); /* length, set later */
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/* iso */
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len_indicator_ptr = s->p;
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out_uint8(s, 0); /* length indicator, set later */
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out_uint8(s, ISO_PDU_CC); /* Connection Confirm PDU */
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out_uint16_be(s, 0);
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out_uint16_be(s, 0x1234);
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out_uint8(s, 0);
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/* rdpNegData */
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if (self->rdpNegData)
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{
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if (self->failureCode)
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{
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out_uint8(s, RDP_NEG_FAILURE);
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out_uint8(s, 0); /* no flags */
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out_uint16_le(s, 8); /* must be 8 */
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out_uint32_le(s, self->failureCode); /* failure code */
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}
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else
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{
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out_uint8(s, RDP_NEG_RSP);
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//TODO: hardcoded flags
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out_uint8(s, EXTENDED_CLIENT_DATA_SUPPORTED); /* flags */
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out_uint16_le(s, 8); /* must be 8 */
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out_uint32_le(s, self->selectedProtocol); /* selected protocol */
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}
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}
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s_mark_end(s);
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len = (int) (s->end - holdp);
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len_indicator = (int) (s->end - len_indicator_ptr) - 1;
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len_ptr[0] = len >> 8;
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len_ptr[1] = len;
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len_indicator_ptr[0] = len_indicator;
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if (trans_force_write_s(self->trans, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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free_stream(s);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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int APP_CC
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xrdp_iso_incoming(struct xrdp_iso *self)
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{
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int rv = 0;
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int code;
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int len;
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int cookie_index;
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int cc_type;
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char text[256];
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char *pend;
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struct stream *s;
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DEBUG((" in xrdp_iso_incoming"));
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s = libxrdp_force_read(self->trans);
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if (s == 0)
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{
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return 1;
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}
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if (xrdp_iso_recv_msg(self, s, &code, &len) != 0)
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{
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g_writeln("xrdp_iso_incoming: xrdp_iso_recv_msg returned non zero");
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return 1;
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}
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if ((code != ISO_PDU_CR) || (len < 6))
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{
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return 1;
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}
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/* process connection request */
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pend = s->p + (len - 6);
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cookie_index = 0;
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while (s->p < pend)
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{
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in_uint8(s, cc_type);
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switch (cc_type)
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{
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default:
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break;
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case RDP_NEG_REQ: /* rdpNegReq 1 */
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self->rdpNegData = 1;
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if (xrdp_iso_process_rdp_neg_req(self, s) != 0)
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{
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g_writeln("xrdp_iso_incoming: xrdp_iso_process_rdpNegReq returned non zero");
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return 1;
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}
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break;
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case RDP_CORRELATION_INFO: /* rdpCorrelationInfo 6 */
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// TODO
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in_uint8s(s, 1 + 2 + 16 + 16);
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break;
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case 'C': /* Cookie routingToken */
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while (s->p < pend)
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{
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text[cookie_index] = cc_type;
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cookie_index++;
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if ((s->p[0] == 0x0D) && (s->p[1] == 0x0A))
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{
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in_uint8s(s, 2);
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text[cookie_index] = 0;
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cookie_index = 0;
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break;
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}
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in_uint8(s, cc_type);
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}
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break;
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}
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}
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/* negotiate client-server security layer */
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rv = xrdp_iso_negotiate_security(self);
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/* send connection confirm back to client */
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if (xrdp_iso_send_cc(self) != 0)
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{
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g_writeln("xrdp_iso_incoming: xrdp_iso_send_cc returned non zero");
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return 1;
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}
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DEBUG((" out xrdp_iso_incoming"));
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return rv;
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}
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/*****************************************************************************/
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/* returns error */
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int APP_CC
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xrdp_iso_init(struct xrdp_iso *self, struct stream *s)
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{
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init_stream(s, 8192 * 4); /* 32 KB */
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s_push_layer(s, iso_hdr, 7);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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int APP_CC
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xrdp_iso_send(struct xrdp_iso *self, struct stream *s)
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{
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int len;
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DEBUG((" in xrdp_iso_send"));
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s_pop_layer(s, iso_hdr);
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len = (int) (s->end - s->p);
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out_uint8(s, 3);
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out_uint8(s, 0);
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out_uint16_be(s, len);
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out_uint8(s, 2);
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out_uint8(s, ISO_PDU_DT);
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out_uint8(s, 0x80);
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if (trans_force_write_s(self->trans, s) != 0)
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{
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return 1;
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}
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DEBUG((" out xrdp_iso_send"));
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return 0;
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}
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