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libfreerdp-core: fix server-side protocol security negotiation for TLS + NLA

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This commit is contained in:
Marc-André Moreau 2012-06-19 20:10:49 -04:00
parent 23027a5b97
commit baa740d612
2 changed files with 50 additions and 39 deletions
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47
libfreerdp-core/connection.c
View File

@ -524,6 +524,7 @@ boolean rdp_client_connect_finalize(rdpRdp* rdp)
boolean rdp_server_accept_nego(rdpRdp* rdp, STREAM* s)
{
boolean status;
rdpSettings* settings = rdp->settings;
transport_set_blocking_mode(rdp->transport, true);
@ -532,41 +533,35 @@ boolean rdp_server_accept_nego(rdpRdp* rdp, STREAM* s)
rdp->nego->selected_protocol = 0;
printf("Requested protocols:");
printf("Client Security: NLA:%d TLS:%d RDP:%d\n",
(rdp->nego->requested_protocols & PROTOCOL_NLA) ? 1 : 0,
(rdp->nego->requested_protocols & PROTOCOL_TLS) ? 1 : 0,
(rdp->nego->requested_protocols == PROTOCOL_RDP) ? 1: 0);
if ((rdp->nego->requested_protocols & PROTOCOL_TLS))
printf("Server Security: NLA:%d TLS:%d RDP:%d\n",
settings->nla_security, settings->tls_security, settings->rdp_security);
if ((settings->nla_security) && (rdp->nego->requested_protocols & PROTOCOL_NLA))
{
printf(" TLS");
if (rdp->settings->tls_security)
{
printf("(Y)");
rdp->nego->selected_protocol |= PROTOCOL_TLS;
}
else
printf("(n)");
rdp->nego->selected_protocol = PROTOCOL_NLA;
}
if ((rdp->nego->requested_protocols & PROTOCOL_NLA))
else if ((settings->tls_security) && (rdp->nego->requested_protocols & PROTOCOL_TLS))
{
printf(" NLA");
if (rdp->settings->nla_security)
{
printf("(Y)");
rdp->nego->selected_protocol |= PROTOCOL_NLA;
}
else
printf("(n)");
rdp->nego->selected_protocol = PROTOCOL_TLS;
}
printf(" RDP");
if (rdp->settings->rdp_security && rdp->nego->selected_protocol == 0)
else if ((settings->rdp_security) && (rdp->nego->selected_protocol == PROTOCOL_RDP))
{
printf("(Y)");
rdp->nego->selected_protocol = PROTOCOL_RDP;
}
else
printf("(n)");
printf("\n");
{
printf("Protocol security negotiation failure\n");
}
printf("Negotiated Security: NLA:%d TLS:%d RDP:%d\n",
(rdp->nego->selected_protocol & PROTOCOL_NLA) ? 1 : 0,
(rdp->nego->selected_protocol & PROTOCOL_TLS) ? 1 : 0,
(rdp->nego->selected_protocol == PROTOCOL_RDP) ? 1: 0);
if (!nego_send_negotiation_response(rdp->nego))
return false;

42
libfreerdp-core/nego.c
View File

@ -297,15 +297,24 @@ boolean nego_recv(rdpTransport* transport, STREAM* s, void* extra)
DEBUG_NEGO("selected_protocol: %d", nego->selected_protocol);
/* enhanced security selected ? */
if (nego->selected_protocol) {
if (nego->selected_protocol == PROTOCOL_NLA &&
!nego->enabled_protocols[PROTOCOL_NLA])
if (nego->selected_protocol)
{
if ((nego->selected_protocol == PROTOCOL_NLA) &&
(!nego->enabled_protocols[PROTOCOL_NLA]))
{
nego->state = NEGO_STATE_FAIL;
if (nego->selected_protocol == PROTOCOL_TLS &&
!nego->enabled_protocols[PROTOCOL_TLS])
}
if ((nego->selected_protocol == PROTOCOL_TLS) &&
(!nego->enabled_protocols[PROTOCOL_TLS]))
{
nego->state = NEGO_STATE_FAIL;
} else if (!nego->enabled_protocols[PROTOCOL_RDP])
}
}
else if (!nego->enabled_protocols[PROTOCOL_RDP])
{
nego->state = NEGO_STATE_FAIL;
}
break;
case TYPE_RDP_NEG_FAILURE:
@ -316,6 +325,7 @@ boolean nego_recv(rdpTransport* transport, STREAM* s, void* extra)
else
{
DEBUG_NEGO("no rdpNegData");
if (!nego->enabled_protocols[PROTOCOL_RDP])
nego->state = NEGO_STATE_FAIL;
else
@ -368,6 +378,7 @@ boolean nego_read_request(rdpNego* nego, STREAM* s)
/* rdpNegData (optional) */
stream_read_uint8(s, type); /* Type */
if (type != TYPE_RDP_NEG_REQ)
{
printf("Incorrect negotiation request type %d\n", type);
@ -470,6 +481,8 @@ void nego_process_negotiation_request(rdpNego* nego, STREAM* s)
stream_read_uint16(s, length);
stream_read_uint32(s, nego->requested_protocols);
DEBUG_NEGO("requested_protocols: %d", nego->requested_protocols);
nego->state = NEGO_STATE_FINAL;
}
@ -543,12 +556,13 @@ void nego_process_negotiation_failure(rdpNego* nego, STREAM* s)
boolean nego_send_negotiation_response(rdpNego* nego)
{
STREAM* s;
rdpSettings* settings;
uint8* bm;
uint8* em;
int length;
uint8 *bm, *em;
boolean ret;
boolean status;
rdpSettings* settings;
ret = true;
status = true;
settings = nego->transport->settings;
s = transport_send_stream_init(nego->transport, 256);
@ -577,7 +591,7 @@ boolean nego_send_negotiation_response(rdpNego* nego)
printf("nego_send_negotiation_response: client supports only Standard RDP Security\n");
stream_write_uint32(s, SSL_REQUIRED_BY_SERVER);
length += 8;
ret = false;
status = false;
}
stream_get_mark(s, em);
@ -589,7 +603,7 @@ boolean nego_send_negotiation_response(rdpNego* nego)
if (transport_write(nego->transport, s) < 0)
return false;
if (ret)
if (status)
{
/* update settings with negotiated protocol security */
settings->requested_protocols = nego->requested_protocols;
@ -600,12 +614,14 @@ boolean nego_send_negotiation_response(rdpNego* nego)
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;
}
@ -629,7 +645,7 @@ boolean nego_send_negotiation_response(rdpNego* nego)
}
}
return ret;
return status;
}
/**