boolean nego_send_negotiation_response(rdpNego* nego)
{
STREAM* s;
int length;
uint8 *bm, *em;
s = transport_send_stream_init(nego->transport, 256);
length = TPDU_CONNECTION_CONFIRM_LENGTH;
stream_get_mark(s, bm);
stream_seek(s, length);
if (nego->selected_protocol > PROTOCOL_RDP)
{
/* RDP_NEG_DATA must be present for TLS and NLA */
stream_write_uint8(s, TYPE_RDP_NEG_RSP);
stream_write_uint8(s, EXTENDED_CLIENT_DATA_SUPPORTED); /* flags */
stream_write_uint16(s, 8); /* RDP_NEG_DATA length (8) */
stream_write_uint32(s, nego->selected_protocol); /* selectedProtocol */
length += 8;
}
stream_get_mark(s, em);
stream_set_mark(s, bm);
tpkt_write_header(s, length);
tpdu_write_connection_confirm(s, length - 5);
stream_set_mark(s, em);
if (transport_write(nego->transport, s) < 0)
return false;
/* update settings with negotiated protocol security */
nego->transport->settings->requested_protocols = nego->requested_protocols;
nego->transport->settings->selected_protocol = nego->selected_protocol;
return true;
}
BOOL nego_send_negotiation_response(rdpNego* nego)
{
int length;
int bm, em;
BOOL status;
wStream* s;
BYTE flags;
rdpSettings* settings;
status = TRUE;
settings = nego->transport->settings;
s = Stream_New(NULL, 512);
if (!s)
return FALSE;
length = TPDU_CONNECTION_CONFIRM_LENGTH;
bm = Stream_GetPosition(s);
Stream_Seek(s, length);
if (nego->SelectedProtocol & PROTOCOL_FAILED_NEGO)
{
UINT32 errorCode = (nego->SelectedProtocol & ~PROTOCOL_FAILED_NEGO);
flags = 0;
Stream_Write_UINT8(s, TYPE_RDP_NEG_FAILURE);
Stream_Write_UINT8(s, flags); /* flags */
Stream_Write_UINT16(s, 8); /* RDP_NEG_DATA length (8) */
Stream_Write_UINT32(s, errorCode);
length += 8;
status = FALSE;
}
else
{
flags = EXTENDED_CLIENT_DATA_SUPPORTED;
if (settings->SupportGraphicsPipeline)
flags |= DYNVC_GFX_PROTOCOL_SUPPORTED;
/* RDP_NEG_DATA must be present for TLS, NLA, and RDP */
Stream_Write_UINT8(s, TYPE_RDP_NEG_RSP);
Stream_Write_UINT8(s, flags); /* flags */
Stream_Write_UINT16(s, 8); /* RDP_NEG_DATA length (8) */
Stream_Write_UINT32(s, nego->SelectedProtocol); /* selectedProtocol */
length += 8;
}
em = Stream_GetPosition(s);
Stream_SetPosition(s, bm);
tpkt_write_header(s, length);
tpdu_write_connection_confirm(s, length - 5);
Stream_SetPosition(s, em);
Stream_SealLength(s);
if (transport_write(nego->transport, s) < 0)
{
Stream_Free(s, TRUE);
return FALSE;
}
Stream_Free(s, TRUE);
if (status)
{
/* update settings with negotiated protocol security */
settings->RequestedProtocols = nego->RequestedProtocols;
settings->SelectedProtocol = nego->SelectedProtocol;
if (settings->SelectedProtocol == PROTOCOL_RDP)
{
settings->TlsSecurity = FALSE;
settings->NlaSecurity = FALSE;
settings->RdpSecurity = TRUE;
settings->UseRdpSecurityLayer = TRUE;
if (settings->EncryptionLevel == ENCRYPTION_LEVEL_NONE)
{
/**
* If the server implementation did not explicitely set a
* encryption level we default to client compatible
*/
settings->EncryptionLevel = ENCRYPTION_LEVEL_CLIENT_COMPATIBLE;
}
if (settings->LocalConnection)
{
/**
* Note: This hack was firstly introduced in commit 95f5e115 to
* disable the unnecessary encryption with peers connecting to
* 127.0.0.1 or local unix sockets.
* This also affects connections via port tunnels! (e.g. ssh -L)
*/
WLog_INFO(TAG, "Turning off encryption for local peer with standard rdp security");
settings->UseRdpSecurityLayer = FALSE;
settings->EncryptionLevel = ENCRYPTION_LEVEL_NONE;
}
if (!settings->RdpServerRsaKey && !settings->RdpKeyFile)
{
WLog_ERR(TAG, "Missing server certificate");
return FALSE;
}
}
else if (settings->SelectedProtocol == PROTOCOL_TLS)
{
settings->TlsSecurity = TRUE;
settings->NlaSecurity = FALSE;
settings->RdpSecurity = FALSE;
settings->UseRdpSecurityLayer = FALSE;
settings->EncryptionLevel = ENCRYPTION_LEVEL_NONE;
}
else if (settings->SelectedProtocol == PROTOCOL_NLA)
{
settings->TlsSecurity = TRUE;
settings->NlaSecurity = TRUE;
settings->RdpSecurity = FALSE;
settings->UseRdpSecurityLayer = FALSE;
settings->EncryptionLevel = ENCRYPTION_LEVEL_NONE;
}
}
return status;
}
BOOL nego_send_negotiation_response(rdpNego* nego)
{
STREAM* s;
BYTE* bm;
BYTE* em;
int length;
BOOL status;
rdpSettings* settings;
status = TRUE;
settings = nego->transport->settings;
s = transport_send_stream_init(nego->transport, 256);
length = TPDU_CONNECTION_CONFIRM_LENGTH;
stream_get_mark(s, bm);
stream_seek(s, length);
if (nego->selected_protocol > PROTOCOL_RDP)
{
/* RDP_NEG_DATA must be present for TLS and NLA */
stream_write_BYTE(s, TYPE_RDP_NEG_RSP);
stream_write_BYTE(s, EXTENDED_CLIENT_DATA_SUPPORTED); /* flags */
stream_write_UINT16(s, 8); /* RDP_NEG_DATA length (8) */
stream_write_UINT32(s, nego->selected_protocol); /* selectedProtocol */
length += 8;
}
else if (!settings->RdpSecurity)
{
stream_write_BYTE(s, TYPE_RDP_NEG_FAILURE);
stream_write_BYTE(s, 0); /* flags */
stream_write_UINT16(s, 8); /* RDP_NEG_DATA length (8) */
/*
* TODO: Check for other possibilities,
* like SSL_NOT_ALLOWED_BY_SERVER.
*/
printf("nego_send_negotiation_response: client supports only Standard RDP Security\n");
stream_write_UINT32(s, SSL_REQUIRED_BY_SERVER);
length += 8;
status = FALSE;
}
stream_get_mark(s, em);
stream_set_mark(s, bm);
tpkt_write_header(s, length);
tpdu_write_connection_confirm(s, length - 5);
stream_set_mark(s, em);
if (transport_write(nego->transport, s) < 0)
return FALSE;
if (status)
{
/* update settings with negotiated protocol security */
settings->RequestedProtocols = nego->requested_protocols;
settings->SelectedProtocol = nego->selected_protocol;
if (settings->SelectedProtocol == PROTOCOL_RDP)
{
settings->TlsSecurity = FALSE;
settings->NlaSecurity = FALSE;
settings->RdpSecurity = TRUE;
if (!settings->LocalConnection)
{
settings->DisableEncryption = TRUE;
settings->EncryptionMethods = ENCRYPTION_METHOD_40BIT | ENCRYPTION_METHOD_128BIT | ENCRYPTION_METHOD_FIPS;
settings->EncryptionLevel = ENCRYPTION_LEVEL_CLIENT_COMPATIBLE;
}
if (settings->DisableEncryption && settings->RdpServerRsaKey == NULL && settings->RdpKeyFile == NULL)
return FALSE;
}
else if (settings->SelectedProtocol == PROTOCOL_TLS)
{
settings->TlsSecurity = TRUE;
settings->NlaSecurity = FALSE;
settings->RdpSecurity = FALSE;
settings->DisableEncryption = FALSE;
settings->EncryptionMethods = ENCRYPTION_METHOD_NONE;
settings->EncryptionLevel = ENCRYPTION_LEVEL_NONE;
}
else if (settings->SelectedProtocol == PROTOCOL_NLA)
{
settings->TlsSecurity = TRUE;
settings->NlaSecurity = TRUE;
settings->RdpSecurity = FALSE;
settings->DisableEncryption = FALSE;
settings->EncryptionMethods = ENCRYPTION_METHOD_NONE;
settings->EncryptionLevel = ENCRYPTION_LEVEL_NONE;
}
}
return status;
}
boolean nego_send_negotiation_response(rdpNego* nego)
{
STREAM* s;
uint8* bm;
uint8* em;
int length;
boolean status;
rdpSettings* settings;
status = true;
settings = nego->transport->settings;
s = transport_send_stream_init(nego->transport, 256);
length = TPDU_CONNECTION_CONFIRM_LENGTH;
stream_get_mark(s, bm);
stream_seek(s, length);
if (nego->selected_protocol > PROTOCOL_RDP)
{
/* RDP_NEG_DATA must be present for TLS and NLA */
stream_write_uint8(s, TYPE_RDP_NEG_RSP);
stream_write_uint8(s, EXTENDED_CLIENT_DATA_SUPPORTED); /* flags */
stream_write_uint16(s, 8); /* RDP_NEG_DATA length (8) */
stream_write_uint32(s, nego->selected_protocol); /* selectedProtocol */
length += 8;
}
else if (!settings->rdp_security)
{
stream_write_uint8(s, TYPE_RDP_NEG_FAILURE);
stream_write_uint8(s, 0); /* flags */
stream_write_uint16(s, 8); /* RDP_NEG_DATA length (8) */
/*
* TODO: Check for other possibilities,
* like SSL_NOT_ALLOWED_BY_SERVER.
*/
printf("nego_send_negotiation_response: client supports only Standard RDP Security\n");
stream_write_uint32(s, SSL_REQUIRED_BY_SERVER);
length += 8;
status = false;
}
stream_get_mark(s, em);
stream_set_mark(s, bm);
tpkt_write_header(s, length);
tpdu_write_connection_confirm(s, length - 5);
stream_set_mark(s, em);
if (transport_write(nego->transport, s) < 0)
return false;
if (status)
{
/* update settings with negotiated protocol security */
settings->requested_protocols = nego->requested_protocols;
settings->selected_protocol = nego->selected_protocol;
if (settings->selected_protocol == PROTOCOL_RDP)
{
settings->tls_security = false;
settings->nla_security = false;
settings->rdp_security = true;
if (!settings->local)
{
settings->encryption = true;
settings->encryption_method = ENCRYPTION_METHOD_40BIT | ENCRYPTION_METHOD_128BIT | ENCRYPTION_METHOD_FIPS;
settings->encryption_level = ENCRYPTION_LEVEL_CLIENT_COMPATIBLE;
}
if (settings->encryption && settings->server_key == NULL && settings->rdp_key_file == NULL)
return false;
}
else if (settings->selected_protocol == PROTOCOL_TLS)
{
settings->tls_security = true;
settings->nla_security = false;
settings->rdp_security = false;
settings->encryption = false;
settings->encryption_method = ENCRYPTION_METHOD_NONE;
settings->encryption_level = ENCRYPTION_LEVEL_NONE;
}
else if (settings->selected_protocol == PROTOCOL_NLA)
{
settings->tls_security = true;
settings->nla_security = true;
settings->rdp_security = false;
settings->encryption = false;
settings->encryption_method = ENCRYPTION_METHOD_NONE;
settings->encryption_level = ENCRYPTION_LEVEL_NONE;
}
}
return status;
}
