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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2015
*
* 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.
*/
/**
*
* @file scp_v1.c
* @brief scp version 1 implementation
* @author Jay Sorg, Simone Fedele
*
*/
#include "sesman.h"
//#include "libscp_types.h"
#include "libscp.h"
extern struct config_sesman *g_cfg; /* in sesman.c */
static void parseCommonStates(enum SCP_SERVER_STATES_E e, const char *f);
/******************************************************************************/
void DEFAULT_CC
scp_v1_process(struct SCP_CONNECTION *c, struct SCP_SESSION *s)
{
long data;
int display;
int retries;
int current_try;
enum SCP_SERVER_STATES_E e;
struct SCP_DISCONNECTED_SESSION *slist;
struct session_item *sitem;
int scount;
SCP_SID sid;
retries = g_cfg->sec.login_retry;
current_try = retries;
data = auth_userpass(s->username, s->password,NULL);
/*LOG_DBG("user: %s\npass: %s", s->username, s->password);*/
while ((!data) && ((retries == 0) || (current_try > 0)))
{
LOG_DBG("data %d - retry %d - currenttry %d - expr %d",
data, retries, current_try,
((!data) && ((retries == 0) || (current_try > 0))));
e = scp_v1s_request_password(c, s, "Wrong username and/or password");
switch (e)
{
case SCP_SERVER_STATE_OK:
/* all ok, we got new username and password */
data = auth_userpass(s->username, s->password,NULL);
/* one try less */
if (current_try > 0)
{
current_try--;
}
break;
default:
/* we check the other errors */
parseCommonStates(e, "scp_v1s_list_sessions()");
scp_session_destroy(s);
return;
//break;
}
}
if (!data)
{
scp_v1s_deny_connection(c, "Login failed");
log_message( LOG_LEVEL_INFO,
"Login failed for user %s. Connection terminated", s->username);
scp_session_destroy(s);
return;
}
/* testing if login is allowed*/
if (0 == access_login_allowed(s->username))
{
scp_v1s_deny_connection(c, "Access to Terminal Server not allowed.");
log_message(LOG_LEVEL_INFO,
"User %s not allowed on TS. Connection terminated", s->username);
scp_session_destroy(s);
return;
}
//check if we need password change
/* list disconnected sessions */
slist = session_get_byuser(s->username, &scount, SESMAN_SESSION_STATUS_DISCONNECTED);
if (scount == 0)
{
/* no disconnected sessions - start a new one */
log_message(LOG_LEVEL_DEBUG, "No disconnected sessions for this user "
"- we create a new one");
if (0 != s->client_ip)
{
log_message(LOG_LEVEL_INFO, "++ created session (access granted): username %s, ip %s", s->username, s->client_ip);
}
else
{
log_message(LOG_LEVEL_INFO, "++ created session (access granted): username %s", s->username);
}
if (SCP_SESSION_TYPE_XVNC == s->type)
{
log_message(LOG_LEVEL_INFO, "starting Xvnc session...");
display = session_start(s->width, s->height, s->bpp, s->username,
s->password, data, SESMAN_SESSION_TYPE_XVNC,
s->domain, s->program, s->directory, s->client_ip);
}
else
{
log_message(LOG_LEVEL_INFO, "starting X11rdp session...");
display = session_start(s->width, s->height, s->bpp, s->username,
s->password, data, SESMAN_SESSION_TYPE_XRDP,
s->domain, s->program, s->directory, s->client_ip);
}
e = scp_v1s_connect_new_session(c, display);
switch (e)
{
case SCP_SERVER_STATE_OK:
/* all ok, we got new username and password */
break;
default:
/* we check the other errors */
parseCommonStates(e, "scp_v1s_connect_new_session()");
break;
}
}
else
{
/* one or more disconnected sessions - listing */
e = scp_v1s_list_sessions(c, scount, slist, &sid);
switch (e)
{
/*case SCP_SERVER_STATE_FORCE_NEW:*/
/* we should check for MaxSessions */
case SCP_SERVER_STATE_SELECTION_CANCEL:
log_message( LOG_LEVEL_INFO, "Connection cancelled after session listing");
break;
case SCP_SERVER_STATE_OK:
/* ok, reconnecting... */
sitem = session_get_bypid(sid);
if (0 == sitem)
{
e = scp_v1s_connection_error(c, "Internal error");
log_message(LOG_LEVEL_INFO, "Cannot find session item on the chain");
}
else
{
display = sitem->display;
/*e=scp_v1s_reconnect_session(c, sitem, display);*/
e = scp_v1s_reconnect_session(c, display);
if (0 != s->client_ip)
{
log_message(LOG_LEVEL_INFO, "++ reconnected session: username %s, display :%d.0, session_pid %d, ip %s", s->username, display, sitem->pid, s->client_ip);
}
else
{
log_message(LOG_LEVEL_INFO, "++ reconnected session: username %s, display :%d.0, session_pid %d", s->username, display, sitem->pid);
}
g_free(sitem);
}
break;
default:
/* we check the other errors */
parseCommonStates(e, "scp_v1s_list_sessions()");
break;
}
}
/* resource management */
if ((e == SCP_SERVER_STATE_OK) && (s->rsr))
{
/* here goes scp resource sharing code */
}
/* cleanup */
scp_session_destroy(s);
auth_end(data);
g_free(slist);
}
static void parseCommonStates(enum SCP_SERVER_STATES_E e, const char *f)
{
switch (e)
{
case SCP_SERVER_STATE_VERSION_ERR:
LOG_DBG("version error")
case SCP_SERVER_STATE_SIZE_ERR:
/* an unknown scp version was requested, so we shut down the */
/* connection (and log the fact) */
log_message(LOG_LEVEL_WARNING,
"protocol violation. connection closed.");
break;
case SCP_SERVER_STATE_NETWORK_ERR:
log_message(LOG_LEVEL_WARNING, "libscp network error.");
break;
case SCP_SERVER_STATE_SEQUENCE_ERR:
log_message(LOG_LEVEL_WARNING, "libscp sequence error.");
break;
case SCP_SERVER_STATE_INTERNAL_ERR:
/* internal error occurred (eg. malloc() error, ecc.) */
log_message(LOG_LEVEL_ERROR, "libscp internal error occurred.");
break;
default:
/* dummy: scp_v1s_request_password won't generate any other */
/* error other than the ones before */
log_message(LOG_LEVEL_ALWAYS, "unknown return from %s", f);
break;
}
}
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