mirror of https://github.com/neutrinolabs/xrdp
645 lines
21 KiB
C
645 lines
21 KiB
C
/**
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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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* Note: [ITU-T X.224] and [ISO/IEC 8073] are essentially two specifications
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* of the same protocol (see [ITU-T X.224] Appendix I – Differences between
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* ITU-T Rec. X.224 (1993) and ISO/IEC 8073:1992). The RDP protocol
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* specification [MS-RDPBCGR] makes reference to the [ITU-T X.224] specificaiton.
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*/
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#if defined(HAVE_CONFIG_H)
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#include <config_ac.h>
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#endif
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#include "libxrdp.h"
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#include "ms-rdpbcgr.h"
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#include "string_calls.h"
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#include "log.h"
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/*****************************************************************************/
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/**
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* Converts a protocol mask ([MS-RDPBCGR] 2.2.1.1.1 to a string)
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*
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* @param protocol Protocol mask
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* @param buff Output buffer
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* @param bufflen total length of buff
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* @return As for snprintf()
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*
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* The string "RDP" is always added to the output, even if other bits
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* are set
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*/
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static int
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protocol_mask_to_str(int protocol, char *buff, int bufflen)
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{
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char delim = '|';
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static const struct bitmask_string bits[] =
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{
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{ PROTOCOL_SSL, "SSL" },
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{ PROTOCOL_HYBRID, "HYBRID" },
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{ PROTOCOL_RDSTLS, "RDSTLS" },
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{ PROTOCOL_HYBRID_EX, "HYBRID_EX"},
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BITMASK_STRING_END_OF_LIST
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};
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int rlen = g_bitmask_to_str(protocol, bits, delim, buff, bufflen);
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/* Append "RDP" */
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if (rlen == 0)
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{
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/* String is empty */
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rlen = g_snprintf(buff, bufflen, "RDP");
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}
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else if (rlen < bufflen)
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{
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rlen += g_snprintf(buff + rlen, bufflen - rlen, "%cRDP", delim);
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}
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return rlen;
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}
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/*****************************************************************************/
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struct xrdp_iso *
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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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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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return self;
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}
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/*****************************************************************************/
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void
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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
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xrdp_iso_negotiate_security(struct xrdp_iso *self)
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{
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char requested_str[64];
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const char *selected_str = "";
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const char *configured_str = "";
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int rv = 0;
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struct xrdp_client_info *client_info = &(self->mcs_layer->sec_layer->rdp_layer->client_info);
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/* Can we do TLS/SSL? (basic check) */
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int ssl_capable = g_file_readable(client_info->certificate) &&
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g_file_readable(client_info->key_file);
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/* Work out what's actually configured in xrdp.ini. The
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* selection happens later, but we can do some error checking here */
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switch (client_info->security_layer)
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{
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case PROTOCOL_RDP:
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configured_str = "RDP";
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break;
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case PROTOCOL_SSL:
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/* We *must* use TLS. Check we can offer it, and it's requested */
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if (ssl_capable)
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{
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configured_str = "SSL";
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if ((self->requestedProtocol & PROTOCOL_SSL) == 0)
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{
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LOG(LOG_LEVEL_ERROR, "Server requires TLS for security, "
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"but the client did not request TLS.");
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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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}
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else
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{
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configured_str = "";
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LOG(LOG_LEVEL_ERROR, "Cannot accept TLS connections because "
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"certificate or private key file is not readable. "
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"certificate file: [%s], private key file: [%s]",
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client_info->certificate, client_info->key_file);
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self->failureCode = SSL_CERT_NOT_ON_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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/* We don't yet support CredSSP */
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if (ssl_capable)
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{
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configured_str = "SSL|RDP";
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}
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else
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{
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/*
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* Tell the user we can't offer TLS, but this isn't fatal */
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configured_str = "RDP";
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LOG(LOG_LEVEL_WARNING, "Cannot accept TLS connections because "
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"certificate or private key file is not readable. "
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"certificate file: [%s], private key file: [%s]",
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client_info->certificate, client_info->key_file);
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}
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break;
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}
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/* Currently the choice comes down to RDP or SSL */
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if (rv != 0)
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{
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self->selectedProtocol = PROTOCOL_RDP;
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selected_str = "";
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}
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else if (ssl_capable && (self->requestedProtocol &
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client_info->security_layer &
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PROTOCOL_SSL) != 0)
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{
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self->selectedProtocol = PROTOCOL_SSL;
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selected_str = "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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selected_str = "RDP";
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}
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protocol_mask_to_str(self->requestedProtocol,
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requested_str, sizeof(requested_str));
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LOG(LOG_LEVEL_INFO, "Security protocol: configured [%s], requested [%s],"
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" selected [%s]",
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configured_str, requested_str, selected_str);
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return rv;
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}
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/*****************************************************************************/
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/* Process a [MS-RDPBCGR] RDP_NEG_REQ message.
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* returns error
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*/
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static int
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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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if (!s_check_rem_and_log(s, 7, "Parsing [MS-RDPBCGR] RDP_NEG_REQ"))
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{
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return 1;
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}
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/* The type field has already been read to determine that this function
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should be called */
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in_uint8(s, flags); /* flags */
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if (flags != 0x0 && flags != 0x8 && flags != 0x1)
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{
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LOG(LOG_LEVEL_ERROR,
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"Unsupported [MS-RDPBCGR] RDP_NEG_REQ flags: 0x%2.2x", flags);
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return 1;
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}
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in_uint16_le(s, len); /* length */
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if (len != 8)
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{
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LOG(LOG_LEVEL_ERROR,
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"Protocol error: [MS-RDPBCGR] RDP_NEG_REQ length must be 8, "
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"received %d", len);
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return 1;
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}
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in_uint32_le(s, self->requestedProtocol); /* requestedProtocols */
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/* TODO: why is requestedProtocols flag value bigger than 0xb invalid? */
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if (self->requestedProtocol > 0xb)
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{
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LOG(LOG_LEVEL_ERROR,
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"Unknown requested protocol flag [MS-RDPBCGR] RDP_NEG_REQ, "
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"requestedProtocol 0x%8.8x", self->requestedProtocol);
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return 1;
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}
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LOG_DEVEL(LOG_LEVEL_TRACE, "Received struct [MS-RDPBCGR] RDP_NEG_REQ "
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"flags 0x%2.2x, length 8, requestedProtocol 0x%8.8x",
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flags, self->requestedProtocol);
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return 0;
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}
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/*****************************************************************************
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* Reads an X.224 PDU (X.224 section 13) preceded by a T.123 TPKT
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* header (T.123 section 8)
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*
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* On entry, the TPKT header length field will have been inspected and used to
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* set up the input stream.
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*
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* On exit, the TPKT header and the fixed part of the PDU header will have been
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* removed from the stream.
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*
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* @param self
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* @param s [in]
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* @param code [out]
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* @param len [out]
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* Returns error
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*****************************************************************************/
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static int
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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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*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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LOG(LOG_LEVEL_WARNING,
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"Bug: the input stream is not the same stream as the "
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"transport input stream");
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}
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/* [ITU-T T.123] TPKT header is 4 bytes, then first 2 bytes of the X.224 CR-TPDU */
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if (!s_check_rem_and_log(s, 6,
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"Parsing [ITU-T T.123] TPKT header and [ITU-T X.224] TPDU header"))
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{
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return 1;
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}
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/* [ITU-T T.123] TPKT header */
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in_uint8(s, ver); /* version */
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in_uint8s(s, 3); /* Skip reserved field (1 byte), plus length (2 bytes) */
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LOG_DEVEL(LOG_LEVEL_TRACE, "Received header [ITU-T T.123] TPKT "
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"version %d, length (ignored)", ver);
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/* [ITU-T X.224] TPDU header */
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in_uint8(s, *len); /* LI (length indicator) */
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in_uint8(s, *code); /* TPDU code */
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LOG_DEVEL(LOG_LEVEL_TRACE, "Received header [ITU-T X.224] TPDU "
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"length indicator %d, TDPU code 0x%2.2x", *len, *code);
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if (ver != 3)
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{
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LOG(LOG_LEVEL_ERROR,
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"Unsupported [ITU-T T.123] TPKT header version: %d", ver);
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LOG_DEVEL_HEXDUMP(LOG_LEVEL_ERROR, "[ITU-T T.123] TPKT header", s->data, 4);
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return 1;
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}
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if (*len == 255)
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{
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/* X.224 13.2.1 - reserved value */
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LOG(LOG_LEVEL_ERROR,
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"[ITU-T X.224] TPDU header: unsupported use of reserved length value");
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LOG_DEVEL_HEXDUMP(LOG_LEVEL_ERROR, "[ITU-T X.224] TPDU header", s->data + 4, 4);
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return 1;
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}
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if (*code == ISO_PDU_DT)
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{
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/* Data PDU : X.224 13.7 class 0 */
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if (!s_check_rem_and_log(s, 1, "Parsing [ITU-T X.224] DT-TPDU (Data) header"))
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{
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return 1;
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}
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in_uint8s(s, 1); /* EOT (End of TSDU Mark) (upper 1 bit) and
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TPDU-NR (Data TPDU Number) (lower 7 bits) */
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}
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else
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{
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/* Other supported X.224 class 0 PDUs all have 5 bytes remaining
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in the fixed header :
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CR Connection request (13.3)
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CC Connection confirm (13.4)
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DR Disconnect request (13.5) */
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if (!s_check_rem_and_log(s, 5, "Parsing [ITU-T X.224] Other PDU header"))
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{
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return 1;
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}
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in_uint8s(s, 5); /* DST-REF (2 bytes)
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SRC-REF (2 bytes)
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[CR, CC] CLASS OPTION (1 byte) or [DR] REASON (1 byte) */
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}
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return 0;
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}
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/*****************************************************************************/
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/* Process the header of a [ITU-T X.224] DT-TPDU (Data) message.
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*
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* returns error
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*/
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int
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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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if (xrdp_iso_recv_msg(self, s, &code, &len) != 0)
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{
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LOG(LOG_LEVEL_ERROR, "xrdp_iso_recv: xrdp_iso_recv_msg failed");
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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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LOG(LOG_LEVEL_ERROR, "xrdp_iso_recv only supports processing "
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"[ITU-T X.224] DT-TPDU (Data) headers. Received TPDU header: "
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"length indicator %d, TDPU code 0x%2.2x", len, code);
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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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/*
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* Send a [ITU-T X.224] CC-TPDU (Connection Confirm) message with
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* [ITU-T T.123] TPKT header.
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*
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* returns error
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*/
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static int
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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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/* [ITU-T T.123] TPKT header */
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out_uint8(s, 3); /* version */
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out_uint8(s, 0); /* reserved (padding) */
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len_ptr = s->p;
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out_uint16_be(s, 0); /* length, set later */
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/* [ITU-T X.224] CC-TPDU */
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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); /* DST-REF */
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out_uint16_be(s, 0x1234); /* SRC-REF */
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out_uint8(s, 0); /* CLASS OPTION */
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/* [MS-RDPBCGR] 2.2.1.2 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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/* [MS-RDPBCGR] RDP_NEG_FAILURE */
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out_uint8(s, RDP_NEG_FAILURE); /* type*/
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out_uint8(s, 0); /* flags (none) */
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out_uint16_le(s, 8); /* length (must be 8) */
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out_uint32_le(s, self->failureCode); /* failureCode */
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LOG_DEVEL(LOG_LEVEL_TRACE, "Adding structure [MS-RDPBCGR] RDP_NEG_FAILURE "
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"flags 0, length 8, failureCode 0x%8.8x", self->failureCode);
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}
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else
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{
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/* [MS-RDPBCGR] RDP_NEG_RSP */
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out_uint8(s, RDP_NEG_RSP); /* type*/
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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); /* length (must be 8) */
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out_uint32_le(s, self->selectedProtocol); /* selectedProtocol */
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LOG_DEVEL(LOG_LEVEL_TRACE, "Adding structure [MS-RDPBCGR] RDP_NEG_RSP "
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"flags 0x%02x, length 8, selectedProtocol 0x%8.8x",
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EXTENDED_CLIENT_DATA_SUPPORTED,
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self->selectedProtocol);
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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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LOG_DEVEL(LOG_LEVEL_TRACE, "Adding header [ITU-T T.123] TPKT "
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"version 3, length %d", len);
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LOG_DEVEL(LOG_LEVEL_TRACE, "Sending [ITU-T X.224] CC-TPDU (Connection Confirm) "
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"length indicator %d, DST-REF 0, SRC-REF 0, CLASS OPTION 0",
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len_indicator);
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if (trans_write_copy_s(self->trans, s) != 0)
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{
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LOG(LOG_LEVEL_ERROR, "Sending [ITU-T X.224] CC-TPDU (Connection Confirm) failed");
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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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* Process an X.224 connection request PDU
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*
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* See MS-RDPBCGR v20190923 sections 2.2.1.1 and 3.3.5.3.1.
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*
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* From the latter, in particular:-
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* - The length embedded in the TPKT header MUST be examined for
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* consistency with the received data. If there is a discrepancy, the
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* connection SHOULD be dropped
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* - If the optional routingToken field exists it MUST be ignored.
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* - If the optional cookie field is present it MUST be ignored.
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* - If both the routingToken and cookie fields are present, the server
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* SHOULD continue with the connection.
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*****************************************************************************/
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/* returns error */
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int
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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 cc_type;
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struct stream *s;
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int expected_pdu_len;
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LOG_DEVEL(LOG_LEVEL_DEBUG, "[ITU-T X.224] Connection Sequence: receive connection request");
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s = libxrdp_force_read(self->trans);
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if (s == NULL)
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{
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LOG(LOG_LEVEL_ERROR, "[ITU-T X.224] Connection Sequence: CR-TPDU (Connection Request) failed");
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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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LOG(LOG_LEVEL_ERROR, "[ITU-T X.224] Connection Sequence: CR-TPDU (Connection Request) failed");
|
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return 1;
|
||
}
|
||
|
||
if (code != ISO_PDU_CR)
|
||
{
|
||
LOG(LOG_LEVEL_ERROR, "xrdp_iso_incoming only supports processing "
|
||
"[ITU-T X.224] CR-TPDU (Connection Request) headers. "
|
||
"Received TPDU header: length indicator %d, TDPU code 0x%2.2x",
|
||
len, code);
|
||
return 1;
|
||
}
|
||
|
||
/*
|
||
* Make sure the length indicator field extracted from the X.224
|
||
* connection request TPDU corresponds to the length in the TPKT header.
|
||
*
|
||
* We do this by seeing how the indicator field minus the counted
|
||
* octets in the TPDU header (6) compares with the space left in
|
||
* the stream.
|
||
*/
|
||
expected_pdu_len = (s->end - s->p) + 6;
|
||
if (len != expected_pdu_len)
|
||
{
|
||
LOG(LOG_LEVEL_ERROR,
|
||
"Invalid length indicator in [ITU-T X.224] CR-TPDU (Connection Request). "
|
||
"expected %d, received %d",
|
||
expected_pdu_len, len);
|
||
return 1;
|
||
}
|
||
|
||
/* process connection request [MS-RDPBCGR] 2.2.1.1 */
|
||
while (s_check_rem(s, 1))
|
||
{
|
||
in_uint8(s, cc_type); /* type or 'C' */
|
||
switch (cc_type)
|
||
{
|
||
default:
|
||
LOG_DEVEL(LOG_LEVEL_WARNING,
|
||
"Ignoring unknown structure type in [ITU-T X.224] CR-TPDU (Connection Request). "
|
||
"type 0x%2.2x", cc_type);
|
||
break;
|
||
case RDP_NEG_REQ: /* rdpNegReq 1 */
|
||
self->rdpNegData = 1;
|
||
if (xrdp_iso_process_rdp_neg_req(self, s) != 0)
|
||
{
|
||
LOG(LOG_LEVEL_ERROR,
|
||
"[ITU-T X.224] Connection Sequence: failed");
|
||
return 1;
|
||
}
|
||
break;
|
||
case RDP_CORRELATION_INFO: /* rdpCorrelationInfo 6 */
|
||
// TODO
|
||
if (!s_check_rem_and_log(s, 1 + 2 + 16 + 16,
|
||
"Parsing [MS-RDPBCGR] RDP_NEG_CORRELATION_INFO"))
|
||
{
|
||
return 1;
|
||
}
|
||
|
||
in_uint8s(s, 1 + 2 + 16 + 16);
|
||
LOG_DEVEL(LOG_LEVEL_TRACE,
|
||
"Received struct [MS-RDPBCGR] RDP_NEG_CORRELATION_INFO "
|
||
"(all fields ignored)");
|
||
break;
|
||
case 'C': /* Cookie or routingToken */
|
||
/* The routingToken and cookie fields are both ASCII
|
||
* strings starting with the word 'Cookie: ' and
|
||
* ending with CR+LF. We ignore both, so we do
|
||
* not need to distinguish them */
|
||
while (s_check_rem(s, 1))
|
||
{
|
||
in_uint8(s, cc_type);
|
||
if (cc_type == 0x0D && s_check_rem(s, 1))
|
||
{
|
||
in_uint8(s, cc_type);
|
||
if (cc_type == 0x0A)
|
||
{
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
LOG_DEVEL(LOG_LEVEL_TRACE,
|
||
"Received struct [MS-RDPBCGR] routingToken or cookie "
|
||
"(ignored)");
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* negotiate client-server security layer */
|
||
rv = xrdp_iso_negotiate_security(self);
|
||
|
||
/* send connection confirm back to client */
|
||
LOG_DEVEL(LOG_LEVEL_DEBUG, "[ITU-T X.224] Connection Sequence: send connection confirmation");
|
||
if (xrdp_iso_send_cc(self) != 0)
|
||
{
|
||
LOG(LOG_LEVEL_ERROR, "[ITU-T X.224] Connection Sequence: send connection confirmation failed");
|
||
return 1;
|
||
}
|
||
|
||
LOG_DEVEL(LOG_LEVEL_DEBUG, "[ITU-T X.224] Connection Sequence: completed");
|
||
return rv;
|
||
}
|
||
|
||
/*****************************************************************************/
|
||
/* returns error */
|
||
int
|
||
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;
|
||
}
|
||
|
||
/*****************************************************************************/
|
||
/* Sends a message with the [ITU-T T.123] TPKT header (T.123 section 8) and
|
||
* [ITU-T X.224] DT-TPDU (Data) header (X.224 section 13)
|
||
* returns error
|
||
*/
|
||
int
|
||
xrdp_iso_send(struct xrdp_iso *self, struct stream *s)
|
||
{
|
||
int len;
|
||
|
||
s_pop_layer(s, iso_hdr);
|
||
len = (int) (s->end - s->p);
|
||
/* [ITU-T T.123] TPKT header */
|
||
out_uint8(s, 3); /* version */
|
||
out_uint8(s, 0); /* reserved (padding) */
|
||
out_uint16_be(s, len); /* length */
|
||
|
||
/* [ITU-T X.224] DT-TPDU (Data) header */
|
||
out_uint8(s, 2); /* LI (length indicator) */
|
||
out_uint8(s, ISO_PDU_DT); /* TPDU code */
|
||
out_uint8(s, 0x80); /* EOT (End of TSDU Mark) (upper 1 bit) and
|
||
TPDU-NR (Data TPDU Number) (lower 7 bits) */
|
||
|
||
LOG_DEVEL(LOG_LEVEL_TRACE, "Adding header [ITU-T T.123] TPKT "
|
||
"version 3, length %d", len);
|
||
LOG_DEVEL(LOG_LEVEL_TRACE, "Adding header [ITU-T X.224] DT-TPDU (Data) "
|
||
"length indicator 2, TPDU code 0x%2.2x, EOT 1, TPDU-NR 0x00",
|
||
ISO_PDU_DT);
|
||
|
||
if (trans_write_copy_s(self->trans, s) != 0)
|
||
{
|
||
LOG(LOG_LEVEL_ERROR, "xrdp_iso_send: trans_write_copy_s failed");
|
||
return 1;
|
||
}
|
||
|
||
return 0;
|
||
}
|