6a8d21cab9
Before this patch, RDP security was (wrongly) the fallback when negociating a security protocol between the client and the server. For example when a client was claiming TLS-only when connecting to a FreeRDP based-server with RDP security only, the result of the negociation was that the server started to do RDP security. The expected behaviour is to send a nego failure packet with error code SSL_NOT_ALLOWED_BY_SERVER. This patch fixes this. We also try to handle all cases of failed negociation and return the corresponding error code.
164 lines
5.0 KiB
C
164 lines
5.0 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* RDP Protocol Security Negotiation
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*
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* Copyright 2011-2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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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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#ifndef FREERDP_CORE_NEGO_H
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#define FREERDP_CORE_NEGO_H
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#include "transport.h"
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#include <freerdp/types.h>
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#include <freerdp/settings.h>
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#include <freerdp/log.h>
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#include <winpr/stream.h>
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/* Protocol Security Negotiation Protocols */
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enum RDP_NEG_PROTOCOLS
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{
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PROTOCOL_RDP = 0x00000000,
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PROTOCOL_TLS = 0x00000001,
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PROTOCOL_NLA = 0x00000002,
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PROTOCOL_EXT = 0x00000008,
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PROTOCOL_FAILED_NEGO = 0x80000000 /* only used internally, not on the wire */
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};
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/* Protocol Security Negotiation Failure Codes */
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enum RDP_NEG_FAILURE_FAILURECODES
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{
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SSL_REQUIRED_BY_SERVER = 0x00000001,
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SSL_NOT_ALLOWED_BY_SERVER = 0x00000002,
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SSL_CERT_NOT_ON_SERVER = 0x00000003,
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INCONSISTENT_FLAGS = 0x00000004,
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HYBRID_REQUIRED_BY_SERVER = 0x00000005
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};
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/* Authorization Result */
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#define AUTHZ_SUCCESS 0x00000000
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#define AUTHZ_ACCESS_DENIED 0x0000052E
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enum _NEGO_STATE
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{
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NEGO_STATE_INITIAL,
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NEGO_STATE_EXT, /* Extended NLA (NLA + TLS implicit) */
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NEGO_STATE_NLA, /* Network Level Authentication (TLS implicit) */
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NEGO_STATE_TLS, /* TLS Encryption without NLA */
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NEGO_STATE_RDP, /* Standard Legacy RDP Encryption */
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NEGO_STATE_FAIL, /* Negotiation failure */
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NEGO_STATE_FINAL
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};
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typedef enum _NEGO_STATE NEGO_STATE;
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/* RDP Negotiation Messages */
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enum RDP_NEG_MSG
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{
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/* X224_TPDU_CONNECTION_REQUEST */
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TYPE_RDP_NEG_REQ = 0x1,
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/* X224_TPDU_CONNECTION_CONFIRM */
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TYPE_RDP_NEG_RSP = 0x2,
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TYPE_RDP_NEG_FAILURE = 0x3
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};
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#define EXTENDED_CLIENT_DATA_SUPPORTED 0x01
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#define DYNVC_GFX_PROTOCOL_SUPPORTED 0x02
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#define RDP_NEGRSP_RESERVED 0x04
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#define RESTRICTED_ADMIN_MODE_SUPPORTED 0x08
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#define PRECONNECTION_PDU_V1_SIZE 16
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#define PRECONNECTION_PDU_V2_MIN_SIZE (PRECONNECTION_PDU_V1_SIZE + 2)
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#define PRECONNECTION_PDU_V1 1
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#define PRECONNECTION_PDU_V2 2
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#define RESTRICTED_ADMIN_MODE_REQUIRED 0x01
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#define CORRELATION_INFO_PRESENT 0x08
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struct rdp_nego
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{
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int port;
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UINT32 flags;
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char* hostname;
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char* cookie;
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BYTE* RoutingToken;
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DWORD RoutingTokenLength;
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BOOL SendPreconnectionPdu;
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UINT32 PreconnectionId;
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char* PreconnectionBlob;
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NEGO_STATE state;
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BOOL TcpConnected;
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BOOL SecurityConnected;
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UINT32 CookieMaxLength;
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BOOL sendNegoData;
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UINT32 SelectedProtocol;
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UINT32 RequestedProtocols;
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BOOL NegotiateSecurityLayer;
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BYTE EnabledProtocols[16];
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BOOL RestrictedAdminModeRequired;
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BOOL GatewayEnabled;
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BOOL GatewayBypassLocal;
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rdpTransport* transport;
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};
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typedef struct rdp_nego rdpNego;
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BOOL nego_connect(rdpNego* nego);
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BOOL nego_disconnect(rdpNego* nego);
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BOOL nego_send_preconnection_pdu(rdpNego* nego);
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void nego_attempt_ext(rdpNego* nego);
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void nego_attempt_nla(rdpNego* nego);
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void nego_attempt_tls(rdpNego* nego);
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void nego_attempt_rdp(rdpNego* nego);
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void nego_send(rdpNego* nego);
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int nego_recv(rdpTransport* transport, wStream* s, void* extra);
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BOOL nego_recv_response(rdpNego* nego);
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BOOL nego_read_request(rdpNego* nego, wStream* s);
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BOOL nego_send_negotiation_request(rdpNego* nego);
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void nego_process_negotiation_request(rdpNego* nego, wStream* s);
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void nego_process_negotiation_response(rdpNego* nego, wStream* s);
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void nego_process_negotiation_failure(rdpNego* nego, wStream* s);
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BOOL nego_send_negotiation_response(rdpNego* nego);
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rdpNego* nego_new(rdpTransport* transport);
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void nego_free(rdpNego* nego);
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void nego_init(rdpNego* nego);
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void nego_set_target(rdpNego* nego, char* hostname, int port);
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void nego_set_negotiation_enabled(rdpNego* nego, BOOL NegotiateSecurityLayer);
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void nego_set_restricted_admin_mode_required(rdpNego* nego, BOOL RestrictedAdminModeRequired);
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void nego_set_gateway_enabled(rdpNego* nego, BOOL GatewayEnabled);
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void nego_set_gateway_bypass_local(rdpNego* nego, BOOL GatewayBypassLocal);
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void nego_enable_rdp(rdpNego* nego, BOOL enable_rdp);
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void nego_enable_tls(rdpNego* nego, BOOL enable_tls);
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void nego_enable_nla(rdpNego* nego, BOOL enable_nla);
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void nego_enable_ext(rdpNego* nego, BOOL enable_ext);
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BOOL nego_set_routing_token(rdpNego* nego, BYTE* RoutingToken, DWORD RoutingTokenLength);
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BOOL nego_set_cookie(rdpNego* nego, char* cookie);
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void nego_set_cookie_max_length(rdpNego* nego, UINT32 CookieMaxLength);
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void nego_set_send_preconnection_pdu(rdpNego* nego, BOOL SendPreconnectionPdu);
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void nego_set_preconnection_id(rdpNego* nego, UINT32 PreconnectionId);
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void nego_set_preconnection_blob(rdpNego* nego, char* PreconnectionBlob);
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#endif /* __NEGO_H */
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