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418 lines
9.9 KiB
418 lines
9.9 KiB
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2013
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* Copyright (C) Idan Freiberg 2013
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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 *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_recv_rdpnegreq(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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DEBUG((" in xrdp_iso_recv_rdpnegreq"));
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in_uint8(s, flags);
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if (flags != 0x0)
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{
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DEBUG((" xrdp_iso_recv_rdpnegreq: 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) // fixed length
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{
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DEBUG((" xrdp_iso_recv_rdpnegreq: 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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//TODO: think of protocol verification logic
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// if (requestedProtocol != PROTOCOL_RDP || PROTOCOL_SSL || PROTOCOL_HYBRID || PROTOCOL_HYBRID_EX)
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// {
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// DEBUG((" xrdp_iso_recv_rdpnegreq: wrong requestedProtocol: %x",requestedProtocol));
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// return 1;
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// }
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DEBUG((" out xrdp_iso_recv_rdpnegreq"));
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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; // TPKT Version
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int plen; // TPKT PacketLength
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int do_read;
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*code = 0; // X.224 Packet Type
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*len = 0; // X.224 Length Indicator
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/* early in connection sequence, iso needs to do a force read */
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do_read = s != self->trans->in_s;
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if (do_read)
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{
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init_stream(s, 4);
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if (trans_force_read_s(self->trans, s, 4) != 0)
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{
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return 1;
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}
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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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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 (do_read)
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{
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init_stream(s, plen - 4);
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if (trans_force_read_s(self->trans, s, plen - 4) != 0)
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{
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return 1;
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}
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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_rdpnegrsp(struct xrdp_iso *self, struct stream *s, int code)
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{
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init_stream(s, 8192 * 4); /* 32 KB */
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/* TPKT HEADER - 4 bytes */
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out_uint8(s, 3); /* version */
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out_uint8(s, 0); /* RESERVED */
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if (self->selectedProtocol != -1)
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{
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out_uint16_be(s, 19); /* length */ //rdp negotiation happens.
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}
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else
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{
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out_uint16_be(s, 11); /* length */ //rdp negotiation doesn't happen.
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}
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/* ISO LAYER - X.224 - 7 bytes*/
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if (self->selectedProtocol != -1)
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{
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out_uint8(s, 14); /* length */
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}
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else
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{
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out_uint8(s, 6); /* length */
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}
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out_uint8(s, code); /* SHOULD BE 0xD for CC */
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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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if (self->selectedProtocol != -1)
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{
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/* RDP_NEG_RSP - 8 bytes*/
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out_uint8(s, RDP_NEG_RSP);
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out_uint8(s, EXTENDED_CLIENT_DATA_SUPPORTED); /* flags */
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out_uint16_le(s, 8); /* fixed length */
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out_uint32_le(s, self->selectedProtocol); /* selected protocol */
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}
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s_mark_end(s);
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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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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_rdpnegfailure(struct xrdp_iso *self, struct stream *s, int code, int failureCode)
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{
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init_stream(s, 8192 * 4); /* 32 KB */
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/* TPKT HEADER - 4 bytes */
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out_uint8(s, 3); /* version */
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out_uint8(s, 0); /* RESERVED */
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out_uint16_be(s, 19); /* length */
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/* ISO LAYER - X.224 - 7 bytes*/
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out_uint8(s, 14); /* length */
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out_uint8(s, code); /* SHOULD BE 0xD for CC */
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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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/* RDP_NEG_FAILURE - 8 bytes*/
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out_uint8(s, RDP_NEG_FAILURE);
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out_uint8(s, 0); /* no flags available */
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out_uint16_le(s, 8); /* fixed length */
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out_uint32_le(s, failureCode); /* failure code */
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s_mark_end(s);
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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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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_nego(struct xrdp_iso *self)
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{
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struct stream *s;
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make_stream(s);
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init_stream(s, 8192);
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//TODO: negotiation logic here.
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if (self->requestedProtocol != PROTOCOL_RDP)
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{
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// Send RDP_NEG_FAILURE back to client
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if (xrdp_iso_send_rdpnegfailure(self, s, ISO_PDU_CC,
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SSL_NOT_ALLOWED_BY_SERVER) != 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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}
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else
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{
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self->selectedProtocol = PROTOCOL_RDP;
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// Send RDP_NEG_RSP back to client
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if (xrdp_iso_send_rdpnegrsp(self, s, ISO_PDU_CC) != 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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}
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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 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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make_stream(s);
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init_stream(s, 8192);
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DEBUG((" in xrdp_iso_incoming"));
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if (xrdp_iso_recv_msg(self, s, &code, &len) != 0)
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{
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DEBUG((" in xrdp_iso_recv_msg error!!"));
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free_stream(s);
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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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free_stream(s);
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return 1;
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}
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self->selectedProtocol = -1;
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self->requestedProtocol = PROTOCOL_RDP;
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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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if (xrdp_iso_recv_rdpnegreq(self, 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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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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if (xrdp_iso_send_nego(self) != 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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DEBUG((" out xrdp_iso_incoming"));
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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_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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