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FreeRDP/libfreerdp/core/connection.c
akallabeth 2e42d8ac2b [core,connection] add more logging 
log peer->ClientCapabilities execution failures
2024-01-10 08:27:14 +01:00

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/*
* FreeRDP: A Remote Desktop Protocol Implementation
* Connection Sequence
*
* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
* Copyright 2015 Thincast Technologies GmbH
* Copyright 2015 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
* Copyright 2023 Armin Novak <anovak@thincast.com>
* Copyright 2023 Thincast Technologies GmbH
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <freerdp/config.h>
#include "settings.h"
#include "info.h"
#include "input.h"
#include "rdp.h"
#include "peer.h"
#include "connection.h"
#include "transport.h"
#include <winpr/crt.h>
#include <winpr/crypto.h>
#include <winpr/ssl.h>
#include <freerdp/log.h>
#include <freerdp/error.h>
#include <freerdp/listener.h>
#include "../cache/pointer.h"
#include "../crypto/crypto.h"
#include "../crypto/privatekey.h"
#include "../crypto/certificate.h"
#include "gateway/arm.h"
#include "utils.h"
#define TAG FREERDP_TAG("core.connection")
/**
* Connection Sequence
* client server
* | |
* |-----------------------X.224 Connection Request PDU--------------------->|
* |<----------------------X.224 Connection Confirm PDU----------------------|
* |-------MCS Connect-Initial PDU with GCC Conference Create Request------->|
* |<-----MCS Connect-Response PDU with GCC Conference Create Response-------|
* |------------------------MCS Erect Domain Request PDU-------------------->|
* |------------------------MCS Attach User Request PDU--------------------->|
* |<-----------------------MCS Attach User Confirm PDU----------------------|
* |------------------------MCS Channel Join Request PDU-------------------->|
* |<-----------------------MCS Channel Join Confirm PDU---------------------|
* |----------------------------Security Exchange PDU----------------------->|
* |-------------------------------Client Info PDU-------------------------->|
* |<---------------------License Error PDU - Valid Client-------------------|
* |<-----------------------------Demand Active PDU--------------------------|
* |------------------------------Confirm Active PDU------------------------>|
* |-------------------------------Synchronize PDU-------------------------->|
* |---------------------------Control PDU - Cooperate---------------------->|
* |------------------------Control PDU - Request Control------------------->|
* |--------------------------Persistent Key List PDU(s)-------------------->|
* |--------------------------------Font List PDU--------------------------->|
* |<------------------------------Synchronize PDU---------------------------|
* |<--------------------------Control PDU - Cooperate-----------------------|
* |<-----------------------Control PDU - Granted Control--------------------|
* |<-------------------------------Font Map PDU-----------------------------|
*
*/
/**
*
* Connection Sequence
*
* 1. Connection Initiation: The client initiates the connection by sending the server a
* Class 0 X.224 Connection Request PDU (section 2.2.1.1). The server responds with a
* Class 0 X.224 Connection Confirm PDU (section 2.2.1.2). From this point, all subsequent
* data sent between client and server is wrapped in an X.224 Data Protocol Data Unit (PDU).
*
* 2. Basic Settings Exchange: Basic settings are exchanged between the client and server by
* using the MCS Connect Initial PDU (section 2.2.1.3) and MCS Connect Response PDU
*(section 2.2.1.4). The Connect Initial PDU contains a Generic Conference Control (GCC) Conference
*Create Request, while the Connect Response PDU contains a GCC Conference Create Response. These
*two GCC packets contain concatenated blocks of settings data (such as core data, security data,
*and network data) which are read by client and server.
*
* 3. Channel Connection: The client sends an MCS Erect Domain Request PDU (section 2.2.1.5),
* followed by an MCS Attach User Request PDU (section 2.2.1.6) to attach the primary user identity
* to the MCS domain. The server responds with an MCS Attach User Confirm PDU (section 2.2.1.7)
* containing the User Channel ID. The client then proceeds to join the user channel, the
* input/output (I/O) channel, and all of the static virtual channels (the I/O and static virtual
* channel IDs are obtained from the data embedded in the GCC packets) by using multiple MCS
*Channel Join Request PDUs (section 2.2.1.8). The server confirms each channel with an MCS Channel
*Join Confirm PDU (section 2.2.1.9). (The client only sends a Channel Join Request after it has
*received the Channel Join Confirm for the previously sent request.)
*
* From this point, all subsequent data sent from the client to the server is wrapped in an MCS
*Send Data Request PDU, while data sent from the server to the client is wrapped in an MCS Send
*Data Indication PDU. This is in addition to the data being wrapped by an X.224 Data PDU.
*
* 4. RDP Security Commencement: If Standard RDP Security mechanisms (section 5.3) are being
*employed and encryption is in force (this is determined by examining the data embedded in the GCC
*Conference Create Response packet) then the client sends a Security Exchange PDU
*(section 2.2.1.10) containing an encrypted 32-byte random number to the server. This random number
*is encrypted with the public key of the server as described in section 5.3.4.1 (the server's
*public key, as well as a 32-byte server-generated random number, are both obtained from the data
*embedded in the GCC Conference Create Response packet). The client and server then utilize the two
*32-byte random numbers to generate session keys which are used to encrypt and validate the
*integrity of subsequent RDP traffic.
*
* From this point, all subsequent RDP traffic can be encrypted and a security header is included
*with the data if encryption is in force. (The Client Info PDU (section 2.2.1.11) and licensing
*PDUs ([MS-RDPELE] section 2.2.2) are an exception in that they always have a security header). The
*Security Header follows the X.224 and MCS Headers and indicates whether the attached data is
*encrypted. Even if encryption is in force, server-to-client traffic may not always be encrypted,
*while client-to-server traffic must always be encrypted (encryption of licensing PDUs is optional,
*however).
*
* 5. Secure Settings Exchange: Secure client data (such as the username, password, and
*auto-reconnect cookie) is sent to the server by using the Client Info PDU (section 2.2.1.11).
*
* 6. Optional Connect-Time Auto-Detection: During the optional connect-time auto-detect phase the
*goal is to determine characteristics of the network, such as the round-trip latency time and the
*bandwidth of the link between the server and client. This is accomplished by exchanging a
*collection of PDUs (specified in section 2.2.1.4) over a predetermined period of time with enough
*data to ensure that the results are statistically relevant.
*
* 7. Licensing: The goal of the licensing exchange is to transfer a license from the server to
*the client. The client stores this license and on subsequent connections sends the license to the
*server for validation. However, in some situations the client may not be issued a license to
*store. In effect, the packets exchanged during this phase of the protocol depend on the licensing
*mechanisms employed by the server. Within the context of this document, it is assumed that the
*client will not be issued a license to store. For details regarding more advanced licensing
*scenarios that take place during the Licensing Phase, see [MS-RDPELE] section 1.3.
*
* 8. Optional Multitransport Bootstrapping: After the connection has been secured and the
*Licensing Phase has run to completion, the server can choose to initiate multitransport
*connections ([MS-RDPEMT] section 1.3). The Initiate Multitransport Request PDU (section 2.2.15.1)
*is sent by the server to the client and results in the out-of-band creation of a multitransport
*connection using messages from the RDP-UDP, TLS, DTLS, and multitransport protocols ([MS-RDPEMT]
*section 1.3.1).
*
* 9. Capabilities Exchange: The server sends the set of capabilities it supports to the client in
*a Demand Active PDU (section 2.2.1.13.1). The client responds with its capabilities by sending a
*Confirm Active PDU (section 2.2.1.13.2).
*
* 10. Connection Finalization: The client and server exchange PDUs to finalize the connection
*details. The client-to-server PDUs sent during this phase have no dependencies on any of the
*server-to-client PDUs; they may be sent as a single batch, provided that sequencing is maintained.
*
* - The Client Synchronize PDU (section 2.2.1.14) is sent after transmitting the Confirm Active
*PDU.
* - The Client Control (Cooperate) PDU (section 2.2.1.15) is sent after transmitting the Client
*Synchronize PDU.
* - The Client Control (Request Control) PDU (section 2.2.1.16) is sent after transmitting the
*Client Control (Cooperate) PDU.
* - The optional Persistent Key List PDUs (section 2.2.1.17) are sent after transmitting the
*Client Control (Request Control) PDU.
* - The Font List PDU (section 2.2.1.18) is sent after transmitting the Persistent Key List PDUs
*or, if the Persistent Key List PDUs were not sent, it is sent after transmitting the Client
*Control (Request Control) PDU (section 2.2.1.16).
*
* The server-to-client PDUs sent during the Connection Finalization Phase have dependencies on the
*client-to-server PDUs.
*
* - The optional Monitor Layout PDU (section 2.2.12.1) has no dependency on any client-to-server
*PDUs and is sent after the Demand Active PDU.
* - The Server Synchronize PDU (section 2.2.1.19) is sent in response to the Confirm Active PDU.
* - The Server Control (Cooperate) PDU (section 2.2.1.20) is sent after transmitting the Server
*Synchronize PDU.
* - The Server Control (Granted Control) PDU (section 2.2.1.21) is sent in response to the Client
*Control (Request Control) PDU.
* - The Font Map PDU (section 2.2.1.22) is sent in response to the Font List PDU.
*
* Once the client has sent the Confirm Active PDU, it can start sending mouse and keyboard input
*to the server, and upon receipt of the Font List PDU the server can start sending graphics output
*to the client.
*
* Besides input and graphics data, other data that can be exchanged between client and server
*after the connection has been finalized includes connection management information and virtual
*channel messages (exchanged between client-side plug-ins and server-side applications).
*/
static BOOL rdp_set_state(rdpRdp* rdp, CONNECTION_STATE state);
static BOOL rdp_client_reset_codecs(rdpContext* context)
{
rdpSettings* settings;
if (!context || !context->settings)
return FALSE;
settings = context->settings;
if (!freerdp_settings_get_bool(settings, FreeRDP_DeactivateClientDecoding))
{
codecs_free(context->codecs);
context->codecs = codecs_new(context);
if (!context->codecs)
return FALSE;
if (!freerdp_client_codecs_prepare(context->codecs,
freerdp_settings_get_codecs_flags(settings),
settings->DesktopWidth, settings->DesktopHeight))
return FALSE;
/* Runtime H264 detection. (only available if dynamic backend loading is defined)
* If no backend is available disable it before the channel is loaded.
*/
#if defined(WITH_GFX_H264) && defined(WITH_OPENH264_LOADING)
if (!context->codecs->h264)
{
settings->GfxH264 = FALSE;
settings->GfxAVC444 = FALSE;
settings->GfxAVC444v2 = FALSE;
}
#endif
}
return TRUE;
}
static BOOL rdp_client_wait_for_activation(rdpRdp* rdp)
{
BOOL timedout = FALSE;
WINPR_ASSERT(rdp);
const rdpSettings* settings = rdp->settings;
WINPR_ASSERT(settings);
UINT64 now = GetTickCount64();
UINT64 dueDate = now + freerdp_settings_get_uint32(settings, FreeRDP_TcpAckTimeout);
for (; (now < dueDate) && !timedout; now = GetTickCount64())
{
HANDLE events[MAXIMUM_WAIT_OBJECTS] = { 0 };
DWORD wstatus = 0;
DWORD nevents = freerdp_get_event_handles(rdp->context, events, ARRAYSIZE(events));
if (!nevents)
{
WLog_ERR(TAG, "error retrieving connection events");
return FALSE;
}
wstatus = WaitForMultipleObjectsEx(nevents, events, FALSE, (dueDate - now), TRUE);
switch (wstatus)
{
case WAIT_TIMEOUT:
/* will make us quit with a timeout */
timedout = TRUE;
break;
case WAIT_ABANDONED:
case WAIT_FAILED:
return FALSE;
case WAIT_IO_COMPLETION:
break;
case WAIT_OBJECT_0:
default:
/* handles all WAIT_OBJECT_0 + [0 .. MAXIMUM_WAIT_OBJECTS-1] cases */
if (rdp_check_fds(rdp) < 0)
{
freerdp_set_last_error_if_not(rdp->context,
FREERDP_ERROR_CONNECT_TRANSPORT_FAILED);
return FALSE;
}
break;
}
if (rdp_is_active_state(rdp))
return TRUE;
}
WLog_ERR(TAG, "Timeout waiting for activation");
freerdp_set_last_error_if_not(rdp->context, FREERDP_ERROR_CONNECT_ACTIVATION_TIMEOUT);
return FALSE;
}
/**
* Establish RDP Connection based on the settings given in the 'rdp' parameter.
* msdn{cc240452}
* @param rdp RDP module
* @return true if the connection succeeded. FALSE otherwise.
*/
BOOL rdp_client_connect(rdpRdp* rdp)
{
UINT32 SelectedProtocol;
BOOL status;
rdpSettings* settings;
/* make sure SSL is initialize for earlier enough for crypto, by taking advantage of winpr SSL
* FIPS flag for openssl initialization */
DWORD flags = WINPR_SSL_INIT_DEFAULT;
WINPR_ASSERT(rdp);
settings = rdp->settings;
WINPR_ASSERT(settings);
if (!rdp_client_reset_codecs(rdp->context))
return FALSE;
if (settings->FIPSMode)
flags |= WINPR_SSL_INIT_ENABLE_FIPS;
winpr_InitializeSSL(flags);
/* FIPS Mode forces the following and overrides the following(by happening later */
/* in the command line processing): */
/* 1. Disables NLA Security since NLA in freerdp uses NTLM(no Kerberos support yet) which uses
* algorithms */
/* not allowed in FIPS for sensitive data. So, we disallow NLA when FIPS is required. */
/* 2. Forces the only supported RDP encryption method to be FIPS. */
if (settings->FIPSMode || winpr_FIPSMode())
{
settings->NlaSecurity = FALSE;
settings->EncryptionMethods = ENCRYPTION_METHOD_FIPS;
}
UINT32 TcpConnectTimeout = freerdp_settings_get_uint32(settings, FreeRDP_TcpConnectTimeout);
if (settings->GatewayArmTransport)
{
if (!arm_resolve_endpoint(rdp->context, TcpConnectTimeout))
{
WLog_ERR(TAG, "error retrieving ARM configuration");
return FALSE;
}
}
const char* hostname = settings->ServerHostname;
if (!hostname)
{
WLog_ERR(TAG, "Missing hostname, can not connect to NULL target");
return FALSE;
}
nego_init(rdp->nego);
nego_set_target(rdp->nego, hostname, settings->ServerPort);
if (settings->GatewayEnabled)
{
char* user = NULL;
char* domain = NULL;
char* cookie = NULL;
size_t user_length = 0;
size_t domain_length = 0;
size_t cookie_length = 0;
if (settings->Username)
{
user = settings->Username;
user_length = strlen(settings->Username);
}
if (settings->Domain)
domain = settings->Domain;
else
domain = settings->ComputerName;
domain_length = strlen(domain);
cookie_length = domain_length + 1 + user_length;
cookie = (char*)malloc(cookie_length + 1);
if (!cookie)
return FALSE;
CopyMemory(cookie, domain, domain_length);
CharUpperBuffA(cookie, domain_length);
cookie[domain_length] = '\\';
if (settings->Username)
CopyMemory(&cookie[domain_length + 1], user, user_length);
cookie[cookie_length] = '\0';
status = nego_set_cookie(rdp->nego, cookie);
free(cookie);
}
else
{
status = nego_set_cookie(rdp->nego, settings->Username);
}
if (!status)
return FALSE;
nego_set_childsession_enabled(rdp->nego, settings->ConnectChildSession);
nego_set_send_preconnection_pdu(rdp->nego, settings->SendPreconnectionPdu);
nego_set_preconnection_id(rdp->nego, settings->PreconnectionId);
nego_set_preconnection_blob(rdp->nego, settings->PreconnectionBlob);
nego_set_negotiation_enabled(rdp->nego, settings->NegotiateSecurityLayer);
nego_set_restricted_admin_mode_required(rdp->nego, settings->RestrictedAdminModeRequired);
nego_set_gateway_enabled(rdp->nego, settings->GatewayEnabled);
nego_set_gateway_bypass_local(rdp->nego, settings->GatewayBypassLocal);
nego_enable_rdp(rdp->nego, settings->RdpSecurity);
nego_enable_tls(rdp->nego, settings->TlsSecurity);
nego_enable_nla(rdp->nego, settings->NlaSecurity);
nego_enable_ext(rdp->nego, settings->ExtSecurity);
nego_enable_rdstls(rdp->nego, settings->RdstlsSecurity);
nego_enable_aad(rdp->nego, settings->AadSecurity);
if (settings->MstscCookieMode)
settings->CookieMaxLength = MSTSC_COOKIE_MAX_LENGTH;
nego_set_cookie_max_length(rdp->nego, settings->CookieMaxLength);
if (settings->LoadBalanceInfo && (settings->LoadBalanceInfoLength > 0))
{
if (!nego_set_routing_token(rdp->nego, settings->LoadBalanceInfo,
settings->LoadBalanceInfoLength))
return FALSE;
}
if (!freerdp_settings_get_bool(settings, FreeRDP_TransportDumpReplay))
{
if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_NEGO))
return FALSE;
if (!nego_connect(rdp->nego))
{
if (!freerdp_get_last_error(rdp->context))
{
freerdp_set_last_error_log(rdp->context,
FREERDP_ERROR_SECURITY_NEGO_CONNECT_FAILED);
WLog_ERR(TAG, "Error: protocol security negotiation or connection failure");
}
return FALSE;
}
SelectedProtocol = nego_get_selected_protocol(rdp->nego);
if ((SelectedProtocol & PROTOCOL_SSL) || (SelectedProtocol == PROTOCOL_RDP) ||
(SelectedProtocol == PROTOCOL_RDSTLS))
{
wStream s = { 0 };
if ((settings->Username != NULL) &&
((freerdp_settings_get_string(settings, FreeRDP_Password) != NULL) ||
(settings->RedirectionPassword != NULL &&
settings->RedirectionPasswordLength > 0)))
settings->AutoLogonEnabled = TRUE;
if (rdp_recv_callback(rdp->transport, &s, rdp) < 0)
return FALSE;
}
transport_set_blocking_mode(rdp->transport, FALSE);
}
else
{
if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_MCS_CREATE_REQUEST))
return FALSE;
}
/* everything beyond this point is event-driven and non blocking */
if (!transport_set_recv_callbacks(rdp->transport, rdp_recv_callback, rdp))
return FALSE;
return rdp_client_wait_for_activation(rdp);
}
BOOL rdp_client_disconnect(rdpRdp* rdp)
{
rdpContext* context;
if (!rdp || !rdp->settings || !rdp->context)
return FALSE;
context = rdp->context;
if (rdp->nego)
{
if (!nego_disconnect(rdp->nego))
return FALSE;
}
if (!rdp_reset(rdp))
return FALSE;
if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_INITIAL))
return FALSE;
if (freerdp_channels_disconnect(context->channels, context->instance) != CHANNEL_RC_OK)
return FALSE;
codecs_free(context->codecs);
context->codecs = NULL;
return TRUE;
}
BOOL rdp_client_disconnect_and_clear(rdpRdp* rdp)
{
rdpContext* context;
if (!rdp_client_disconnect(rdp))
return FALSE;
WINPR_ASSERT(rdp);
context = rdp->context;
WINPR_ASSERT(context);
if (freerdp_get_last_error(context) == FREERDP_ERROR_CONNECT_CANCELLED)
return FALSE;
context->LastError = FREERDP_ERROR_SUCCESS;
clearChannelError(context);
return utils_reset_abort(rdp);
}
static BOOL rdp_client_reconnect_channels(rdpRdp* rdp, BOOL redirect)
{
BOOL status = FALSE;
rdpContext* context;
if (!rdp || !rdp->context || !rdp->context->channels)
return FALSE;
context = rdp->context;
if (context->instance->ConnectionCallbackState == CLIENT_STATE_INITIAL)
return FALSE;
if (context->instance->ConnectionCallbackState == CLIENT_STATE_PRECONNECT_PASSED)
{
if (redirect)
return TRUE;
pointer_cache_register_callbacks(context->update);
if (!IFCALLRESULT(FALSE, context->instance->PostConnect, context->instance))
return FALSE;
context->instance->ConnectionCallbackState = CLIENT_STATE_POSTCONNECT_PASSED;
}
if (context->instance->ConnectionCallbackState == CLIENT_STATE_POSTCONNECT_PASSED)
status =
(freerdp_channels_post_connect(context->channels, context->instance) == CHANNEL_RC_OK);
return status;
}
static BOOL rdp_client_redirect_resolvable(const char* host)
{
struct addrinfo* result = freerdp_tcp_resolve_host(host, -1, 0);
if (!result)
return FALSE;
freeaddrinfo(result);
return TRUE;
}
static BOOL rdp_client_redirect_try_fqdn(rdpSettings* settings)
{
if (settings->RedirectionFlags & LB_TARGET_FQDN)
{
if (settings->GatewayEnabled ||
rdp_client_redirect_resolvable(settings->RedirectionTargetFQDN))
{
if (!freerdp_settings_set_string(settings, FreeRDP_ServerHostname,
settings->RedirectionTargetFQDN))
return FALSE;
return TRUE;
}
}
return FALSE;
}
static BOOL rdp_client_redirect_try_ip(rdpSettings* settings)
{
if (settings->RedirectionFlags & LB_TARGET_NET_ADDRESS)
{
if (!freerdp_settings_set_string(settings, FreeRDP_ServerHostname,
settings->TargetNetAddress))
return FALSE;
return TRUE;
}
return FALSE;
}
static BOOL rdp_client_redirect_try_netbios(rdpSettings* settings)
{
if (settings->RedirectionFlags & LB_TARGET_NETBIOS_NAME)
{
if (settings->GatewayEnabled ||
rdp_client_redirect_resolvable(settings->RedirectionTargetNetBiosName))
{
if (!freerdp_settings_set_string(settings, FreeRDP_ServerHostname,
settings->RedirectionTargetNetBiosName))
return FALSE;
return TRUE;
}
}
return FALSE;
}
BOOL rdp_client_redirect(rdpRdp* rdp)
{
BOOL status;
rdpSettings* settings;
if (!rdp_client_disconnect_and_clear(rdp))
return FALSE;
freerdp_channels_disconnect(rdp->context->channels, rdp->context->instance);
freerdp_channels_close(rdp->context->channels, rdp->context->instance);
freerdp_channels_free(rdp->context->channels);
rdp->context->channels = freerdp_channels_new(rdp->context->instance);
WINPR_ASSERT(rdp->context->channels);
if (rdp_redirection_apply_settings(rdp) != 0)
return FALSE;
WINPR_ASSERT(rdp);
settings = rdp->settings;
WINPR_ASSERT(settings);
if ((settings->RedirectionFlags & LB_LOAD_BALANCE_INFO) == 0)
{
BOOL haveRedirectAddress = FALSE;
UINT32 redirectionMask = settings->RedirectionPreferType;
do
{
const BOOL tryFQDN = (redirectionMask & 0x01) == 0;
const BOOL tryNetAddress = (redirectionMask & 0x02) == 0;
const BOOL tryNetbios = (redirectionMask & 0x04) == 0;
if (tryFQDN && !haveRedirectAddress)
haveRedirectAddress = rdp_client_redirect_try_fqdn(settings);
if (tryNetAddress && !haveRedirectAddress)
haveRedirectAddress = rdp_client_redirect_try_ip(settings);
if (tryNetbios && !haveRedirectAddress)
haveRedirectAddress = rdp_client_redirect_try_netbios(settings);
redirectionMask >>= 3;
} while (!haveRedirectAddress && (redirectionMask != 0));
}
if (settings->RedirectionFlags & LB_USERNAME)
{
if (!freerdp_settings_set_string(
settings, FreeRDP_Username,
freerdp_settings_get_string(settings, FreeRDP_RedirectionUsername)))
return FALSE;
}
if (settings->RedirectionFlags & LB_DOMAIN)
{
if (!freerdp_settings_set_string(
settings, FreeRDP_Domain,
freerdp_settings_get_string(settings, FreeRDP_RedirectionDomain)))
return FALSE;
}
settings->RdstlsSecurity =
(settings->RedirectionFlags & LB_PASSWORD_IS_PK_ENCRYPTED) != 0 ? TRUE : FALSE;
WINPR_ASSERT(rdp->context);
WINPR_ASSERT(rdp->context->instance);
if (!IFCALLRESULT(TRUE, rdp->context->instance->Redirect, rdp->context->instance))
return FALSE;
BOOL ok = IFCALLRESULT(TRUE, rdp->context->instance->LoadChannels, rdp->context->instance);
if (!ok)
return FALSE;
if (CHANNEL_RC_OK !=
freerdp_channels_pre_connect(rdp->context->channels, rdp->context->instance))
return FALSE;
status = rdp_client_connect(rdp);
if (status)
status = rdp_client_reconnect_channels(rdp, TRUE);
return status;
}
BOOL rdp_client_reconnect(rdpRdp* rdp)
{
BOOL status;
if (!rdp_client_disconnect_and_clear(rdp))
return FALSE;
status = rdp_client_connect(rdp);
if (status)
status = rdp_client_reconnect_channels(rdp, FALSE);
return status;
}
static const BYTE fips_ivec[8] = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
static BOOL rdp_client_establish_keys(rdpRdp* rdp)
{
wStream* s = NULL;
int status = 0;
BOOL ret = FALSE;
WINPR_ASSERT(rdp);
rdpSettings* settings = rdp->settings;
BYTE* crypt_client_random = NULL;
WINPR_ASSERT(settings);
if (!settings->UseRdpSecurityLayer)
{
/* no RDP encryption */
return TRUE;
}
if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_RDP_SECURITY_COMMENCEMENT))
return FALSE;
/* encrypt client random */
if (!freerdp_settings_set_pointer_len(settings, FreeRDP_ClientRandom, NULL,
CLIENT_RANDOM_LENGTH))
return FALSE;
winpr_RAND(settings->ClientRandom, settings->ClientRandomLength);
const rdpCertInfo* info = freerdp_certificate_get_info(settings->RdpServerCertificate);
if (!info)
{
WLog_ERR(TAG, "Failed to get rdpCertInfo from RdpServerCertificate");
return FALSE;
}
/*
* client random must be (bitlen / 8) + 8 - see [MS-RDPBCGR] 5.3.4.1
* for details
*/
crypt_client_random = calloc(info->ModulusLength, 1);
if (!crypt_client_random)
return FALSE;
crypto_rsa_public_encrypt(settings->ClientRandom, settings->ClientRandomLength, info,
crypt_client_random, info->ModulusLength);
/* send crypt client random to server */
const size_t length =
RDP_PACKET_HEADER_MAX_LENGTH + RDP_SECURITY_HEADER_LENGTH + 4 + info->ModulusLength + 8;
s = Stream_New(NULL, length);
if (!s)
{
WLog_ERR(TAG, "Stream_New failed!");
goto end;
}
if (!rdp_write_header(rdp, s, length, MCS_GLOBAL_CHANNEL_ID))
goto end;
if (!rdp_write_security_header(rdp, s, SEC_EXCHANGE_PKT | SEC_LICENSE_ENCRYPT_SC))
goto end;
Stream_Write_UINT32(s, info->ModulusLength + 8);
Stream_Write(s, crypt_client_random, info->ModulusLength);
Stream_Zero(s, 8);
Stream_SealLength(s);
status = transport_write(rdp->mcs->transport, s);
Stream_Free(s, TRUE);
if (status < 0)
goto end;
rdp->do_crypt_license = TRUE;
/* now calculate encrypt / decrypt and update keys */
if (!security_establish_keys(rdp))
goto end;
rdp->do_crypt = TRUE;
if (settings->SaltedChecksum)
rdp->do_secure_checksum = TRUE;
if (settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS)
{
rdp->fips_encrypt = winpr_Cipher_New(WINPR_CIPHER_DES_EDE3_CBC, WINPR_ENCRYPT,
rdp->fips_encrypt_key, fips_ivec);
if (!rdp->fips_encrypt)
{
WLog_ERR(TAG, "unable to allocate des3 encrypt key");
goto end;
}
rdp->fips_decrypt = winpr_Cipher_New(WINPR_CIPHER_DES_EDE3_CBC, WINPR_DECRYPT,
rdp->fips_decrypt_key, fips_ivec);
if (!rdp->fips_decrypt)
{
WLog_ERR(TAG, "unable to allocate des3 decrypt key");
goto end;
}
ret = TRUE;
goto end;
}
if (!rdp_reset_rc4_encrypt_keys(rdp))
goto end;
if (!rdp_reset_rc4_decrypt_keys(rdp))
goto end;
ret = TRUE;
end:
free(crypt_client_random);
if (!ret)
{
winpr_Cipher_Free(rdp->fips_decrypt);
winpr_Cipher_Free(rdp->fips_encrypt);
rdp->fips_decrypt = NULL;
rdp->fips_encrypt = NULL;
rdp_free_rc4_decrypt_keys(rdp);
rdp_free_rc4_encrypt_keys(rdp);
}
return ret;
}
static BOOL rdp_update_client_random(rdpSettings* settings, const BYTE* crypt_random,
size_t crypt_random_len)
{
const size_t length = 32;
WINPR_ASSERT(settings);
const rdpPrivateKey* rsa = freerdp_settings_get_pointer(settings, FreeRDP_RdpServerRsaKey);
WINPR_ASSERT(rsa);
const rdpCertInfo* cinfo = freerdp_key_get_info(rsa);
WINPR_ASSERT(cinfo);
if (crypt_random_len != cinfo->ModulusLength + 8)
{
WLog_ERR(TAG, "invalid encrypted client random length");
return FALSE;
}
if (!freerdp_settings_set_pointer_len(settings, FreeRDP_ClientRandom, NULL, length))
return FALSE;
BYTE* client_random = freerdp_settings_get_pointer_writable(settings, FreeRDP_ClientRandom);
WINPR_ASSERT(client_random);
return crypto_rsa_private_decrypt(crypt_random, crypt_random_len - 8, rsa, client_random,
length) > 0;
}
BOOL rdp_server_establish_keys(rdpRdp* rdp, wStream* s)
{
UINT32 rand_len = 0;
UINT16 channel_id = 0;
UINT16 length = 0;
UINT16 sec_flags = 0;
BOOL ret = FALSE;
WINPR_ASSERT(rdp);
if (!rdp->settings->UseRdpSecurityLayer)
{
/* No RDP Security. */
return TRUE;
}
if (!rdp_read_header(rdp, s, &length, &channel_id))
return FALSE;
if (!rdp_read_security_header(rdp, s, &sec_flags, NULL))
{
WLog_ERR(TAG, "invalid security header");
return FALSE;
}
if ((sec_flags & SEC_EXCHANGE_PKT) == 0)
{
WLog_ERR(TAG, "missing SEC_EXCHANGE_PKT in security header");
return FALSE;
}
rdp->do_crypt_license = (sec_flags & SEC_LICENSE_ENCRYPT_SC) != 0 ? TRUE : FALSE;
if (!Stream_CheckAndLogRequiredLength(TAG, s, 4))
return FALSE;
Stream_Read_UINT32(s, rand_len);
/* rand_len already includes 8 bytes of padding */
if (!Stream_CheckAndLogRequiredLength(TAG, s, rand_len))
return FALSE;
const BYTE* crypt_random = Stream_ConstPointer(s);
if (!Stream_SafeSeek(s, rand_len))
goto end;
if (!rdp_update_client_random(rdp->settings, crypt_random, rand_len))
goto end;
/* now calculate encrypt / decrypt and update keys */
if (!security_establish_keys(rdp))
goto end;
rdp->do_crypt = TRUE;
if (rdp->settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS)
{
rdp->fips_encrypt = winpr_Cipher_New(WINPR_CIPHER_DES_EDE3_CBC, WINPR_ENCRYPT,
rdp->fips_encrypt_key, fips_ivec);
if (!rdp->fips_encrypt)
{
WLog_ERR(TAG, "unable to allocate des3 encrypt key");
goto end;
}
rdp->fips_decrypt = winpr_Cipher_New(WINPR_CIPHER_DES_EDE3_CBC, WINPR_DECRYPT,
rdp->fips_decrypt_key, fips_ivec);
if (!rdp->fips_decrypt)
{
WLog_ERR(TAG, "unable to allocate des3 decrypt key");
goto end;
}
ret = TRUE;
goto end;
}
if (!rdp_reset_rc4_encrypt_keys(rdp))
goto end;
if (!rdp_reset_rc4_decrypt_keys(rdp))
goto end;
ret = tpkt_ensure_stream_consumed(s, length);
end:
if (!ret)
{
winpr_Cipher_Free(rdp->fips_encrypt);
winpr_Cipher_Free(rdp->fips_decrypt);
rdp->fips_encrypt = NULL;
rdp->fips_decrypt = NULL;
rdp_free_rc4_encrypt_keys(rdp);
rdp_free_rc4_decrypt_keys(rdp);
}
return ret;
}
static BOOL rdp_client_send_client_info_and_change_state(rdpRdp* rdp)
{
WINPR_ASSERT(rdp);
if (!rdp_client_establish_keys(rdp))
return FALSE;
if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_SECURE_SETTINGS_EXCHANGE))
return FALSE;
if (!rdp_send_client_info(rdp))
return FALSE;
if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_CONNECT_TIME_AUTO_DETECT_REQUEST))
return FALSE;
return TRUE;
}
BOOL rdp_client_skip_mcs_channel_join(rdpRdp* rdp)
{
WINPR_ASSERT(rdp);
rdpMcs* mcs = rdp->mcs;
WINPR_ASSERT(mcs);
mcs->userChannelJoined = TRUE;
mcs->globalChannelJoined = TRUE;
mcs->messageChannelJoined = TRUE;
for (UINT32 i = 0; i < mcs->channelCount; i++)
{
rdpMcsChannel* cur = &mcs->channels[i];
WLog_DBG(TAG, " %s [%" PRIu16 "]", cur->Name, cur->ChannelId);
cur->joined = TRUE;
}
return rdp_client_send_client_info_and_change_state(rdp);
}
static BOOL rdp_client_join_channel(rdpRdp* rdp, UINT16 ChannelId)
{
WINPR_ASSERT(rdp);
rdpMcs* mcs = rdp->mcs;
if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_MCS_CHANNEL_JOIN_REQUEST))
return FALSE;
if (!mcs_send_channel_join_request(mcs, ChannelId))
return FALSE;
if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_MCS_CHANNEL_JOIN_RESPONSE))
return FALSE;
return TRUE;
}
BOOL rdp_client_connect_mcs_channel_join_confirm(rdpRdp* rdp, wStream* s)
{
UINT32 i;
UINT16 channelId;
BOOL allJoined = TRUE;
WINPR_ASSERT(rdp);
rdpMcs* mcs = rdp->mcs;
if (!mcs_recv_channel_join_confirm(mcs, s, &channelId))
return FALSE;
if (!mcs->userChannelJoined)
{
if (channelId != mcs->userId)
{
WLog_ERR(TAG, "expected user channel id %" PRIu16 ", but received %" PRIu16,
mcs->userId, channelId);
return FALSE;
}
mcs->userChannelJoined = TRUE;
if (!rdp_client_join_channel(rdp, MCS_GLOBAL_CHANNEL_ID))
return FALSE;
}
else if (!mcs->globalChannelJoined)
{
if (channelId != MCS_GLOBAL_CHANNEL_ID)
{
WLog_ERR(TAG, "expected uglobalser channel id %" PRIu16 ", but received %" PRIu16,
MCS_GLOBAL_CHANNEL_ID, channelId);
return FALSE;
}
mcs->globalChannelJoined = TRUE;
if (mcs->messageChannelId != 0)
{
if (!rdp_client_join_channel(rdp, mcs->messageChannelId))
return FALSE;
allJoined = FALSE;
}
else
{
if (mcs->channelCount > 0)
{
const rdpMcsChannel* cur = &mcs->channels[0];
if (!rdp_client_join_channel(rdp, cur->ChannelId))
return FALSE;
allJoined = FALSE;
}
}
}
else if ((mcs->messageChannelId != 0) && !mcs->messageChannelJoined)
{
if (channelId != mcs->messageChannelId)
{
WLog_ERR(TAG, "expected messageChannelId=%" PRIu16 ", got %" PRIu16,
mcs->messageChannelId, channelId);
return FALSE;
}
mcs->messageChannelJoined = TRUE;
if (mcs->channelCount > 0)
{
const rdpMcsChannel* cur = &mcs->channels[0];
if (!rdp_client_join_channel(rdp, cur->ChannelId))
return FALSE;
allJoined = FALSE;
}
}
else
{
for (i = 0; i < mcs->channelCount; i++)
{
rdpMcsChannel* cur = &mcs->channels[i];
if (cur->joined)
continue;
if (cur->ChannelId != channelId)
{
WLog_ERR(TAG, "expected channel id %" PRIu16 ", but received %" PRIu16,
MCS_GLOBAL_CHANNEL_ID, channelId);
return FALSE;
}
cur->joined = TRUE;
break;
}
if (i + 1 < mcs->channelCount)
{
const rdpMcsChannel* cur = &mcs->channels[i + 1];
if (!rdp_client_join_channel(rdp, cur->ChannelId))
return FALSE;
allJoined = FALSE;
}
}
if (mcs->userChannelJoined && mcs->globalChannelJoined && allJoined)
{
if (!rdp_client_send_client_info_and_change_state(rdp))
return FALSE;
}
return TRUE;
}
BOOL rdp_client_connect_auto_detect(rdpRdp* rdp, wStream* s)
{
WINPR_ASSERT(rdp);
WINPR_ASSERT(rdp->mcs);
const UINT16 messageChannelId = rdp->mcs->messageChannelId;
/* If the MCS message channel has been joined... */
if (messageChannelId != 0)
{
/* Process any MCS message channel PDUs. */
const size_t pos = Stream_GetPosition(s);
UINT16 length = 0;
UINT16 channelId = 0;
if (rdp_read_header(rdp, s, &length, &channelId))
{
if (channelId == messageChannelId)
{
UINT16 securityFlags = 0;
if (!rdp_read_security_header(rdp, s, &securityFlags, &length))
return FALSE;
if (securityFlags & SEC_ENCRYPT)
{
if (!rdp_decrypt(rdp, s, &length, securityFlags))
return FALSE;
}
if (rdp_recv_message_channel_pdu(rdp, s, securityFlags) == STATE_RUN_SUCCESS)
return tpkt_ensure_stream_consumed(s, length);
}
}
else
WLog_WARN(TAG, "expected messageChannelId=%" PRIu16 ", got %" PRIu16, messageChannelId,
channelId);
Stream_SetPosition(s, pos);
}
else
WLog_WARN(TAG, "messageChannelId == 0");
return FALSE;
}
state_run_t rdp_client_connect_license(rdpRdp* rdp, wStream* s)
{
state_run_t status = STATE_RUN_FAILED;
LICENSE_STATE state;
UINT16 length, channelId, securityFlags;
WINPR_ASSERT(rdp);
if (!rdp_read_header(rdp, s, &length, &channelId))
return STATE_RUN_FAILED;
if (!rdp_read_security_header(rdp, s, &securityFlags, &length))
return STATE_RUN_FAILED;
if (securityFlags & SEC_ENCRYPT)
{
if (!rdp_decrypt(rdp, s, &length, securityFlags))
return STATE_RUN_FAILED;
}
/* there might be autodetect messages mixed in between licensing messages.
* that has been observed with 2k12 R2 and 2k19
*/
const UINT16 messageChannelId = rdp->mcs->messageChannelId;
if ((channelId == messageChannelId) || (securityFlags & SEC_AUTODETECT_REQ))
{
return rdp_recv_message_channel_pdu(rdp, s, securityFlags);
}
if (channelId != MCS_GLOBAL_CHANNEL_ID)
WLog_WARN(TAG, "unexpected message for channel %u, expected %u", channelId,
MCS_GLOBAL_CHANNEL_ID);
if ((securityFlags & SEC_LICENSE_PKT) == 0)
{
char buffer[512] = { 0 };
char lbuffer[32] = { 0 };
WLog_ERR(TAG, "securityFlags=%s, missing required flag %s",
rdp_security_flag_string(securityFlags, buffer, sizeof(buffer)),
rdp_security_flag_string(SEC_LICENSE_PKT, lbuffer, sizeof(lbuffer)));
return STATE_RUN_FAILED;
}
status = license_recv(rdp->license, s);
if (state_run_failed(status))
return status;
state = license_get_state(rdp->license);
switch (state)
{
case LICENSE_STATE_ABORTED:
WLog_ERR(TAG, "license connection sequence aborted.");
return STATE_RUN_FAILED;
case LICENSE_STATE_COMPLETED:
if (rdp->settings->MultitransportFlags)
{
if (!rdp_client_transition_to_state(
rdp, CONNECTION_STATE_MULTITRANSPORT_BOOTSTRAPPING_REQUEST))
return STATE_RUN_FAILED;
}
else
{
if (!rdp_client_transition_to_state(
rdp, CONNECTION_STATE_CAPABILITIES_EXCHANGE_DEMAND_ACTIVE))
return STATE_RUN_FAILED;
}
return STATE_RUN_SUCCESS;
default:
return STATE_RUN_SUCCESS;
}
}
state_run_t rdp_client_connect_demand_active(rdpRdp* rdp, wStream* s)
{
UINT16 length = 0;
UINT16 channelId = 0;
UINT16 pduType = 0;
UINT16 pduSource = 0;
WINPR_ASSERT(rdp);
WINPR_ASSERT(s);
WINPR_ASSERT(rdp->settings);
if (!rdp_recv_get_active_header(rdp, s, &channelId, &length))
return STATE_RUN_FAILED;
if (freerdp_shall_disconnect_context(rdp->context))
return STATE_RUN_QUIT_SESSION;
if (!rdp_read_share_control_header(rdp, s, NULL, NULL, &pduType, &pduSource))
return STATE_RUN_FAILED;
switch (pduType)
{
case PDU_TYPE_DEMAND_ACTIVE:
if (!rdp_recv_demand_active(rdp, s, pduSource, length))
return STATE_RUN_FAILED;
return STATE_RUN_ACTIVE;
default:
return rdp_recv_out_of_sequence_pdu(rdp, s, pduType, length);
}
}
state_run_t rdp_client_connect_finalize(rdpRdp* rdp)
{
WINPR_ASSERT(rdp);
/**
* [MS-RDPBCGR] 1.3.1.1 - 8.
* The client-to-server PDUs sent during this phase have no dependencies on any of the
* server-to- client PDUs; they may be sent as a single batch, provided that sequencing is
* maintained.
*/
if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_FINALIZATION_SYNC))
return STATE_RUN_FAILED;
if (!rdp_send_client_synchronize_pdu(rdp))
return STATE_RUN_FAILED;
if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_FINALIZATION_COOPERATE))
return STATE_RUN_FAILED;
if (!rdp_send_client_control_pdu(rdp, CTRLACTION_COOPERATE))
return STATE_RUN_FAILED;
if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_FINALIZATION_REQUEST_CONTROL))
return STATE_RUN_FAILED;
if (!rdp_send_client_control_pdu(rdp, CTRLACTION_REQUEST_CONTROL))
return STATE_RUN_FAILED;
/**
* [MS-RDPBCGR] 2.2.1.17
* Client persistent key list must be sent if a bitmap is
* stored in persistent bitmap cache or the server has advertised support for bitmap
* host cache and a deactivation reactivation sequence is *not* in progress.
*/
if (!rdp_finalize_is_flag_set(rdp, FINALIZE_DEACTIVATE_REACTIVATE) &&
freerdp_settings_get_bool(rdp->settings, FreeRDP_BitmapCachePersistEnabled))
{
if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_FINALIZATION_PERSISTENT_KEY_LIST))
return STATE_RUN_FAILED;
if (!rdp_send_client_persistent_key_list_pdu(rdp))
return STATE_RUN_FAILED;
}
if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_FINALIZATION_FONT_LIST))
return STATE_RUN_FAILED;
if (!rdp_send_client_font_list_pdu(rdp, FONTLIST_FIRST | FONTLIST_LAST))
return STATE_RUN_FAILED;
if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_FINALIZATION_CLIENT_SYNC))
return STATE_RUN_FAILED;
return STATE_RUN_SUCCESS;
}
BOOL rdp_client_transition_to_state(rdpRdp* rdp, CONNECTION_STATE state)
{
const char* name = rdp_state_string(state);
WINPR_ASSERT(rdp);
WLog_Print(rdp->log, WLOG_DEBUG, "%s --> %s", rdp_get_state_string(rdp), name);
if (!rdp_set_state(rdp, state))
return FALSE;
switch (state)
{
case CONNECTION_STATE_FINALIZATION_SYNC:
case CONNECTION_STATE_FINALIZATION_COOPERATE:
case CONNECTION_STATE_FINALIZATION_REQUEST_CONTROL:
case CONNECTION_STATE_FINALIZATION_PERSISTENT_KEY_LIST:
case CONNECTION_STATE_FINALIZATION_FONT_LIST:
update_reset_state(rdp->update);
break;
case CONNECTION_STATE_CAPABILITIES_EXCHANGE_CONFIRM_ACTIVE:
{
ActivatedEventArgs activatedEvent = { 0 };
rdpContext* context = rdp->context;
EventArgsInit(&activatedEvent, "libfreerdp");
activatedEvent.firstActivation =
!rdp_finalize_is_flag_set(rdp, FINALIZE_DEACTIVATE_REACTIVATE);
PubSub_OnActivated(rdp->pubSub, context, &activatedEvent);
}
break;
default:
break;
}
{
ConnectionStateChangeEventArgs stateEvent = { 0 };
rdpContext* context = rdp->context;
EventArgsInit(&stateEvent, "libfreerdp");
stateEvent.state = rdp_get_state(rdp);
stateEvent.active = rdp_is_active_state(rdp);
PubSub_OnConnectionStateChange(rdp->pubSub, context, &stateEvent);
}
return TRUE;
}
BOOL rdp_server_accept_nego(rdpRdp* rdp, wStream* s)
{
UINT32 SelectedProtocol = 0;
UINT32 RequestedProtocols;
BOOL status;
rdpSettings* settings;
rdpNego* nego;
WINPR_ASSERT(rdp);
WINPR_ASSERT(s);
settings = rdp->settings;
WINPR_ASSERT(settings);
nego = rdp->nego;
WINPR_ASSERT(nego);
transport_set_blocking_mode(rdp->transport, TRUE);
if (!nego_read_request(nego, s))
return FALSE;
RequestedProtocols = nego_get_requested_protocols(nego);
WLog_DBG(TAG, "Client Security: RDSTLS:%d NLA:%d TLS:%d RDP:%d",
(RequestedProtocols & PROTOCOL_RDSTLS) ? 1 : 0,
(RequestedProtocols & PROTOCOL_HYBRID) ? 1 : 0,
(RequestedProtocols & PROTOCOL_SSL) ? 1 : 0,
(RequestedProtocols == PROTOCOL_RDP) ? 1 : 0);
WLog_DBG(TAG,
"Server Security: RDSTLS:%" PRId32 " NLA:%" PRId32 " TLS:%" PRId32 " RDP:%" PRId32 "",
settings->RdstlsSecurity, settings->NlaSecurity, settings->TlsSecurity,
settings->RdpSecurity);
if ((settings->RdstlsSecurity) && (RequestedProtocols & PROTOCOL_RDSTLS))
{
SelectedProtocol = PROTOCOL_RDSTLS;
}
else if ((settings->NlaSecurity) && (RequestedProtocols & PROTOCOL_HYBRID))
{
SelectedProtocol = PROTOCOL_HYBRID;
}
else if ((settings->TlsSecurity) && (RequestedProtocols & PROTOCOL_SSL))
{
SelectedProtocol = PROTOCOL_SSL;
}
else if ((settings->RdpSecurity) && (RequestedProtocols == PROTOCOL_RDP))
{
SelectedProtocol = PROTOCOL_RDP;
}
else
{
/*
* when here client and server aren't compatible, we select the right
* error message to return to the client in the nego failure packet
*/
SelectedProtocol = PROTOCOL_FAILED_NEGO;
if (settings->RdpSecurity)
{
WLog_ERR(TAG, "server supports only Standard RDP Security");
SelectedProtocol |= SSL_NOT_ALLOWED_BY_SERVER;
}
else
{
if (settings->NlaSecurity && !settings->TlsSecurity)
{
WLog_WARN(TAG, "server supports only NLA Security");
SelectedProtocol |= HYBRID_REQUIRED_BY_SERVER;
}
else
{
WLog_WARN(TAG, "server supports only a SSL based Security (TLS or NLA)");
SelectedProtocol |= SSL_REQUIRED_BY_SERVER;
}
}
WLog_ERR(TAG, "Protocol security negotiation failure");
}
if (!(SelectedProtocol & PROTOCOL_FAILED_NEGO))
{
WLog_DBG(TAG, "Negotiated Security: RDSTLS:%d NLA:%d TLS:%d RDP:%d",
(SelectedProtocol & PROTOCOL_RDSTLS) ? 1 : 0,
(SelectedProtocol & PROTOCOL_HYBRID) ? 1 : 0,
(SelectedProtocol & PROTOCOL_SSL) ? 1 : 0,
(SelectedProtocol == PROTOCOL_RDP) ? 1 : 0);
}
if (!nego_set_selected_protocol(nego, SelectedProtocol))
return FALSE;
if (!nego_send_negotiation_response(nego))
return FALSE;
SelectedProtocol = nego_get_selected_protocol(nego);
status = FALSE;
if (SelectedProtocol & PROTOCOL_RDSTLS)
status = transport_accept_rdstls(rdp->transport);
else if (SelectedProtocol & PROTOCOL_HYBRID)
status = transport_accept_nla(rdp->transport);
else if (SelectedProtocol & PROTOCOL_SSL)
status = transport_accept_tls(rdp->transport);
else if (SelectedProtocol == PROTOCOL_RDP) /* 0 */
status = transport_accept_rdp(rdp->transport);
if (!status)
return FALSE;
transport_set_blocking_mode(rdp->transport, FALSE);
return TRUE;
}
BOOL rdp_server_accept_mcs_connect_initial(rdpRdp* rdp, wStream* s)
{
WINPR_ASSERT(rdp);
WINPR_ASSERT(s);
rdpMcs* mcs = rdp->mcs;
WINPR_ASSERT(mcs);
WINPR_ASSERT(rdp_get_state(rdp) == CONNECTION_STATE_MCS_CREATE_REQUEST);
if (!mcs_recv_connect_initial(mcs, s))
return FALSE;
WINPR_ASSERT(rdp->settings);
if (!mcs_server_apply_to_settings(mcs, rdp->settings))
return FALSE;
WLog_DBG(TAG, "Accepted client: %s", rdp->settings->ClientHostname);
WLog_DBG(TAG, "Accepted channels:");
WINPR_ASSERT(mcs->channels || (mcs->channelCount == 0));
for (UINT32 i = 0; i < mcs->channelCount; i++)
{
ADDIN_ARGV* arg;
rdpMcsChannel* cur = &mcs->channels[i];
const char* params[1] = { cur->Name };
WLog_DBG(TAG, " %s [%" PRIu16 "]", cur->Name, cur->ChannelId);
arg = freerdp_addin_argv_new(ARRAYSIZE(params), params);
if (!arg)
return FALSE;
if (!freerdp_static_channel_collection_add(rdp->settings, arg))
{
freerdp_addin_argv_free(arg);
return FALSE;
}
}
if (!rdp_server_transition_to_state(rdp, CONNECTION_STATE_MCS_CREATE_RESPONSE))
return FALSE;
if (!mcs_send_connect_response(mcs))
return FALSE;
if (!rdp_server_transition_to_state(rdp, CONNECTION_STATE_MCS_ERECT_DOMAIN))
return FALSE;
return TRUE;
}
BOOL rdp_server_accept_mcs_erect_domain_request(rdpRdp* rdp, wStream* s)
{
WINPR_ASSERT(rdp);
WINPR_ASSERT(s);
WINPR_ASSERT(rdp_get_state(rdp) == CONNECTION_STATE_MCS_ERECT_DOMAIN);
if (!mcs_recv_erect_domain_request(rdp->mcs, s))
return FALSE;
return rdp_server_transition_to_state(rdp, CONNECTION_STATE_MCS_ATTACH_USER);
}
static BOOL rdp_server_skip_mcs_channel_join(rdpRdp* rdp)
{
WINPR_ASSERT(rdp);
rdpMcs* mcs = rdp->mcs;
WINPR_ASSERT(mcs);
mcs->userChannelJoined = TRUE;
mcs->globalChannelJoined = TRUE;
mcs->messageChannelJoined = TRUE;
for (UINT32 i = 0; i < mcs->channelCount; i++)
{
rdpMcsChannel* cur = &mcs->channels[i];
WLog_DBG(TAG, " %s [%" PRIu16 "]", cur->Name, cur->ChannelId);
cur->joined = TRUE;
}
return rdp_server_transition_to_state(rdp, CONNECTION_STATE_RDP_SECURITY_COMMENCEMENT);
}
BOOL rdp_server_accept_mcs_attach_user_request(rdpRdp* rdp, wStream* s)
{
if (!mcs_recv_attach_user_request(rdp->mcs, s))
return FALSE;
if (!rdp_server_transition_to_state(rdp, CONNECTION_STATE_MCS_ATTACH_USER_CONFIRM))
return FALSE;
if (!mcs_send_attach_user_confirm(rdp->mcs))
return FALSE;
if (freerdp_settings_get_bool(rdp->settings, FreeRDP_SupportSkipChannelJoin))
return rdp_server_skip_mcs_channel_join(rdp);
return rdp_server_transition_to_state(rdp, CONNECTION_STATE_MCS_CHANNEL_JOIN_REQUEST);
}
BOOL rdp_server_accept_mcs_channel_join_request(rdpRdp* rdp, wStream* s)
{
UINT32 i;
UINT16 channelId;
BOOL allJoined = TRUE;
rdpMcs* mcs;
WINPR_ASSERT(rdp);
WINPR_ASSERT(rdp->context);
mcs = rdp->mcs;
WINPR_ASSERT(mcs);
WINPR_ASSERT(rdp_get_state(rdp) == CONNECTION_STATE_MCS_CHANNEL_JOIN_REQUEST);
if (!mcs_recv_channel_join_request(mcs, rdp->settings, s, &channelId))
return FALSE;
if (!rdp_server_transition_to_state(rdp, CONNECTION_STATE_MCS_CHANNEL_JOIN_RESPONSE))
return FALSE;
if (!mcs_send_channel_join_confirm(mcs, channelId))
return FALSE;
if (channelId == mcs->userId)
mcs->userChannelJoined = TRUE;
if (channelId == MCS_GLOBAL_CHANNEL_ID)
mcs->globalChannelJoined = TRUE;
if (channelId == mcs->messageChannelId)
mcs->messageChannelJoined = TRUE;
for (i = 0; i < mcs->channelCount; i++)
{
rdpMcsChannel* cur = &mcs->channels[i];
WLog_DBG(TAG, " %s [%" PRIu16 "]", cur->Name, cur->ChannelId);
if (cur->ChannelId == channelId)
cur->joined = TRUE;
if (!cur->joined)
allJoined = FALSE;
}
CONNECTION_STATE rc;
if ((mcs->userChannelJoined) && (mcs->globalChannelJoined) &&
(mcs->messageChannelId == 0 || mcs->messageChannelJoined) && allJoined)
rc = CONNECTION_STATE_RDP_SECURITY_COMMENCEMENT;
else
rc = CONNECTION_STATE_MCS_CHANNEL_JOIN_REQUEST;
return rdp_server_transition_to_state(rdp, rc);
}
static BOOL rdp_server_send_sync(rdpRdp* rdp)
{
WINPR_ASSERT(rdp);
if (!rdp_server_transition_to_state(rdp, CONNECTION_STATE_FINALIZATION_CLIENT_SYNC))
return FALSE;
if (!rdp_send_server_synchronize_pdu(rdp))
return FALSE;
if (!rdp_server_transition_to_state(rdp, CONNECTION_STATE_FINALIZATION_CLIENT_COOPERATE))
return FALSE;
if (!rdp_send_server_control_cooperate_pdu(rdp))
return FALSE;
if (!rdp_finalize_reset_flags(rdp, FALSE))
return FALSE;
return rdp_server_transition_to_state(rdp, CONNECTION_STATE_FINALIZATION_SYNC);
}
BOOL rdp_server_accept_confirm_active(rdpRdp* rdp, wStream* s, UINT16 pduLength)
{
WINPR_ASSERT(rdp);
WINPR_ASSERT(rdp->context);
WINPR_ASSERT(rdp->settings);
WINPR_ASSERT(s);
freerdp_peer* peer = rdp->context->peer;
WINPR_ASSERT(peer);
if (rdp_get_state(rdp) != CONNECTION_STATE_CAPABILITIES_EXCHANGE_CONFIRM_ACTIVE)
{
if (freerdp_settings_get_bool(rdp->settings, FreeRDP_TransportDumpReplay))
rdp_finalize_set_flag(rdp, FINALIZE_DEACTIVATE_REACTIVATE);
else
{
WLog_WARN(TAG, "Invalid state, got %s, expected %s", rdp_get_state_string(rdp),
rdp_state_string(CONNECTION_STATE_CAPABILITIES_EXCHANGE_CONFIRM_ACTIVE));
return FALSE;
}
}
if (!rdp_recv_confirm_active(rdp, s, pduLength))
return FALSE;
if (peer->ClientCapabilities && !peer->ClientCapabilities(peer))
{
WLog_WARN(TAG, "peer->ClientCapabilities failed");
return FALSE;
}
if (rdp->settings->SaltedChecksum)
rdp->do_secure_checksum = TRUE;
return rdp_server_send_sync(rdp);
}
BOOL rdp_server_reactivate(rdpRdp* rdp)
{
freerdp_peer* client = NULL;
if (rdp->context && rdp->context->peer)
client = rdp->context->peer;
if (client)
client->activated = FALSE;
if (!rdp_send_deactivate_all(rdp))
return FALSE;
rdp_finalize_set_flag(rdp, FINALIZE_DEACTIVATE_REACTIVATE);
if (!rdp_server_transition_to_state(rdp, CONNECTION_STATE_CAPABILITIES_EXCHANGE_DEMAND_ACTIVE))
return FALSE;
state_run_t rc = rdp_peer_handle_state_demand_active(client);
return state_run_success(rc);
}
static BOOL rdp_is_active_peer_state(CONNECTION_STATE state)
{
/* [MS-RDPBCGR] 1.3.1.1 Connection Sequence states:
* 'upon receipt of the Font List PDU the server can start sending graphics
* output to the client'
*/
switch (state)
{
case CONNECTION_STATE_FINALIZATION_CLIENT_SYNC:
case CONNECTION_STATE_FINALIZATION_CLIENT_COOPERATE:
case CONNECTION_STATE_FINALIZATION_CLIENT_GRANTED_CONTROL:
case CONNECTION_STATE_FINALIZATION_CLIENT_FONT_MAP:
case CONNECTION_STATE_ACTIVE:
return TRUE;
default:
return FALSE;
}
}
static BOOL rdp_is_active_client_state(CONNECTION_STATE state)
{
/* [MS-RDPBCGR] 1.3.1.1 Connection Sequence states:
* 'Once the client has sent the Confirm Active PDU, it can start sending
* mouse and keyboard input to the server'
*/
switch (state)
{
case CONNECTION_STATE_FINALIZATION_SYNC:
case CONNECTION_STATE_FINALIZATION_COOPERATE:
case CONNECTION_STATE_FINALIZATION_REQUEST_CONTROL:
case CONNECTION_STATE_FINALIZATION_PERSISTENT_KEY_LIST:
case CONNECTION_STATE_FINALIZATION_FONT_LIST:
case CONNECTION_STATE_FINALIZATION_CLIENT_SYNC:
case CONNECTION_STATE_FINALIZATION_CLIENT_COOPERATE:
case CONNECTION_STATE_FINALIZATION_CLIENT_GRANTED_CONTROL:
case CONNECTION_STATE_FINALIZATION_CLIENT_FONT_MAP:
case CONNECTION_STATE_ACTIVE:
return TRUE;
default:
return FALSE;
}
}
BOOL rdp_is_active_state(const rdpRdp* rdp)
{
WINPR_ASSERT(rdp);
WINPR_ASSERT(rdp->context);
const CONNECTION_STATE state = rdp_get_state(rdp);
if (freerdp_settings_get_bool(rdp->context->settings, FreeRDP_ServerMode))
return rdp_is_active_peer_state(state);
else
return rdp_is_active_client_state(state);
}
BOOL rdp_server_transition_to_state(rdpRdp* rdp, CONNECTION_STATE state)
{
BOOL status = FALSE;
freerdp_peer* client = NULL;
const CONNECTION_STATE cstate = rdp_get_state(rdp);
if (cstate >= CONNECTION_STATE_RDP_SECURITY_COMMENCEMENT)
{
WINPR_ASSERT(rdp->context);
client = rdp->context->peer;
}
if (!rdp_is_active_peer_state(cstate))
{
if (client)
client->activated = FALSE;
}
WLog_Print(rdp->log, WLOG_DEBUG, "%s --> %s", rdp_get_state_string(rdp),
rdp_state_string(state));
if (!rdp_set_state(rdp, state))
goto fail;
status = TRUE;
fail:
return status;
}
const char* rdp_client_connection_state_string(int state)
{
switch (state)
{
case CLIENT_STATE_INITIAL:
return "CLIENT_STATE_INITIAL";
case CLIENT_STATE_PRECONNECT_PASSED:
return "CLIENT_STATE_PRECONNECT_PASSED";
case CLIENT_STATE_POSTCONNECT_PASSED:
return "CLIENT_STATE_POSTCONNECT_PASSED";
default:
return "UNKNOWN";
}
}
const char* rdp_state_string(CONNECTION_STATE state)
{
switch (state)
{
case CONNECTION_STATE_INITIAL:
return "CONNECTION_STATE_INITIAL";
case CONNECTION_STATE_NEGO:
return "CONNECTION_STATE_NEGO";
case CONNECTION_STATE_NLA:
return "CONNECTION_STATE_NLA";
case CONNECTION_STATE_AAD:
return "CONNECTION_STATE_AAD";
case CONNECTION_STATE_MCS_CREATE_REQUEST:
return "CONNECTION_STATE_MCS_CREATE_REQUEST";
case CONNECTION_STATE_MCS_CREATE_RESPONSE:
return "CONNECTION_STATE_MCS_CREATE_RESPONSE";
case CONNECTION_STATE_MCS_ERECT_DOMAIN:
return "CONNECTION_STATE_MCS_ERECT_DOMAIN";
case CONNECTION_STATE_MCS_ATTACH_USER:
return "CONNECTION_STATE_MCS_ATTACH_USER";
case CONNECTION_STATE_MCS_ATTACH_USER_CONFIRM:
return "CONNECTION_STATE_MCS_ATTACH_USER_CONFIRM";
case CONNECTION_STATE_MCS_CHANNEL_JOIN_REQUEST:
return "CONNECTION_STATE_MCS_CHANNEL_JOIN_REQUEST";
case CONNECTION_STATE_MCS_CHANNEL_JOIN_RESPONSE:
return "CONNECTION_STATE_MCS_CHANNEL_JOIN_RESPONSE";
case CONNECTION_STATE_RDP_SECURITY_COMMENCEMENT:
return "CONNECTION_STATE_RDP_SECURITY_COMMENCEMENT";
case CONNECTION_STATE_SECURE_SETTINGS_EXCHANGE:
return "CONNECTION_STATE_SECURE_SETTINGS_EXCHANGE";
case CONNECTION_STATE_CONNECT_TIME_AUTO_DETECT_REQUEST:
return "CONNECTION_STATE_CONNECT_TIME_AUTO_DETECT_REQUEST";
case CONNECTION_STATE_CONNECT_TIME_AUTO_DETECT_RESPONSE:
return "CONNECTION_STATE_CONNECT_TIME_AUTO_DETECT_RESPONSE";
case CONNECTION_STATE_LICENSING:
return "CONNECTION_STATE_LICENSING";
case CONNECTION_STATE_MULTITRANSPORT_BOOTSTRAPPING_REQUEST:
return "CONNECTION_STATE_MULTITRANSPORT_BOOTSTRAPPING_REQUEST";
case CONNECTION_STATE_MULTITRANSPORT_BOOTSTRAPPING_RESPONSE:
return "CONNECTION_STATE_MULTITRANSPORT_BOOTSTRAPPING_RESPONSE";
case CONNECTION_STATE_CAPABILITIES_EXCHANGE_DEMAND_ACTIVE:
return "CONNECTION_STATE_CAPABILITIES_EXCHANGE_DEMAND_ACTIVE";
case CONNECTION_STATE_CAPABILITIES_EXCHANGE_MONITOR_LAYOUT:
return "CONNECTION_STATE_CAPABILITIES_EXCHANGE_MONITOR_LAYOUT";
case CONNECTION_STATE_CAPABILITIES_EXCHANGE_CONFIRM_ACTIVE:
return "CONNECTION_STATE_CAPABILITIES_EXCHANGE_CONFIRM_ACTIVE";
case CONNECTION_STATE_FINALIZATION_SYNC:
return "CONNECTION_STATE_FINALIZATION_SYNC";
case CONNECTION_STATE_FINALIZATION_COOPERATE:
return "CONNECTION_STATE_FINALIZATION_COOPERATE";
case CONNECTION_STATE_FINALIZATION_REQUEST_CONTROL:
return "CONNECTION_STATE_FINALIZATION_REQUEST_CONTROL";
case CONNECTION_STATE_FINALIZATION_PERSISTENT_KEY_LIST:
return "CONNECTION_STATE_FINALIZATION_PERSISTENT_KEY_LIST";
case CONNECTION_STATE_FINALIZATION_FONT_LIST:
return "CONNECTION_STATE_FINALIZATION_FONT_LIST";
case CONNECTION_STATE_FINALIZATION_CLIENT_SYNC:
return "CONNECTION_STATE_FINALIZATION_CLIENT_SYNC";
case CONNECTION_STATE_FINALIZATION_CLIENT_COOPERATE:
return "CONNECTION_STATE_FINALIZATION_CLIENT_COOPERATE";
case CONNECTION_STATE_FINALIZATION_CLIENT_GRANTED_CONTROL:
return "CONNECTION_STATE_FINALIZATION_CLIENT_GRANTED_CONTROL";
case CONNECTION_STATE_FINALIZATION_CLIENT_FONT_MAP:
return "CONNECTION_STATE_FINALIZATION_CLIENT_FONT_MAP";
case CONNECTION_STATE_ACTIVE:
return "CONNECTION_STATE_ACTIVE";
default:
return "UNKNOWN";
}
}
CONNECTION_STATE rdp_get_state(const rdpRdp* rdp)
{
WINPR_ASSERT(rdp);
return rdp->state;
}
BOOL rdp_set_state(rdpRdp* rdp, CONNECTION_STATE state)
{
WINPR_ASSERT(rdp);
rdp->state = state;
return TRUE;
}
const char* rdp_get_state_string(const rdpRdp* rdp)
{
CONNECTION_STATE state = rdp_get_state(rdp);
return rdp_state_string(state);
}
BOOL rdp_channels_from_mcs(rdpSettings* settings, const rdpRdp* rdp)
{
size_t x;
const rdpMcs* mcs;
WINPR_ASSERT(rdp);
mcs = rdp->mcs;
WINPR_ASSERT(mcs);
if (!freerdp_settings_set_pointer_len(settings, FreeRDP_ChannelDefArray, NULL,
CHANNEL_MAX_COUNT))
return FALSE;
for (x = 0; x < mcs->channelCount; x++)
{
const rdpMcsChannel* mchannel = &mcs->channels[x];
CHANNEL_DEF cur = { 0 };
memcpy(cur.name, mchannel->Name, sizeof(cur.name));
cur.options = mchannel->options;
if (!freerdp_settings_set_pointer_array(settings, FreeRDP_ChannelDefArray, x, &cur))
return FALSE;
}
return freerdp_settings_set_uint32(settings, FreeRDP_ChannelCount, mcs->channelCount);
}
/* Here we are in client state CONFIRM_ACTIVE.
*
* This means:
* 1. send the CONFIRM_ACTIVE PDU to the server
* 2. register callbacks, the server can now start sending stuff
*/
state_run_t rdp_client_connect_confirm_active(rdpRdp* rdp, wStream* s)
{
WINPR_ASSERT(rdp);
WINPR_ASSERT(rdp->settings);
WINPR_ASSERT(s);
const UINT32 width = rdp->settings->DesktopWidth;
const UINT32 height = rdp->settings->DesktopHeight;
if (!rdp_send_confirm_active(rdp))
return STATE_RUN_FAILED;
if (!input_register_client_callbacks(rdp->input))
{
WLog_ERR(TAG, "error registering client callbacks");
return STATE_RUN_FAILED;
}
/**
* The server may request a different desktop size during Deactivation-Reactivation sequence.
* In this case, the UI should be informed and do actual window resizing at this point.
*/
const BOOL deactivate_reactivate =
rdp->was_deactivated && ((rdp->deactivated_width != rdp->settings->DesktopWidth) ||
(rdp->deactivated_height != rdp->settings->DesktopHeight));
const BOOL resolution_change =
((width != rdp->settings->DesktopWidth) || (height != rdp->settings->DesktopHeight));
if (deactivate_reactivate || resolution_change)
{
BOOL status = TRUE;
IFCALLRET(rdp->update->DesktopResize, status, rdp->update->context);
if (!status)
{
WLog_ERR(TAG, "client desktop resize callback failed");
return STATE_RUN_FAILED;
}
}
WINPR_ASSERT(rdp->context);
if (freerdp_shall_disconnect_context(rdp->context))
return STATE_RUN_SUCCESS;
state_run_t status = STATE_RUN_SUCCESS;
if (!rdp->settings->SupportMonitorLayoutPdu)
status = rdp_client_connect_finalize(rdp);
else
{
if (!rdp_client_transition_to_state(rdp,
CONNECTION_STATE_CAPABILITIES_EXCHANGE_MONITOR_LAYOUT))
status = STATE_RUN_FAILED;
}
if (!rdp_finalize_reset_flags(rdp, FALSE))
status = STATE_RUN_FAILED;
return status;
}
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