xrdp/sesman/scp_v1.c

/*
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

   xrdp: A Remote Desktop Protocol server.
   Copyright (C) Jay Sorg 2005-2007
*/

/**
 *
 * @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;

/******************************************************************************/
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);
  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);
        /* one try less */ 
        if (current_try > 0)
        {
          current_try--;
        }
        break;
      case SCP_SERVER_STATE_VERSION_ERR:
        LOG_DBG("version error", 0)
      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.");
        return;
      case SCP_SERVER_STATE_NETWORK_ERR:
        log_message(LOG_LEVEL_WARNING, "libscp network error.");
        return;
      case SCP_SERVER_STATE_SEQUENCE_ERR:
        log_message(LOG_LEVEL_WARNING, "libscp sequence error.");
        return;
      case SCP_SERVER_STATE_INTERNAL_ERR:
        /* internal error occurred (eg. malloc() error, ecc.) */
        log_message(LOG_LEVEL_ERROR, "libscp internal error occurred.");
        return;
      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 scp_v1s_request_password()");
        return;
    }
  }

  if (!data)
  {
    scp_v1s_deny_connection(c, "Login failed");
    log_message(LOG_LEVEL_INFO,
      "Login failed for user %s. Connection terminated", s->username);
    free_session(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);
    free_session(s);
    return;
  }

  //check if we need password change

  /* list disconnected sessions */
  slist = session_get_byuser(s->username, &scount);

  if (scount == 0)
  {
#warning FIXME we should check for MaxSessions
    /* no disconnected sessions - start a new one */
    log_message(LOG_LEVEL_INFO, "granted TS access to user %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);
    }
    else
    {
      log_message(LOG_LEVEL_INFO, "starting Xrdp session...");
      display = session_start(s->width, s->height, s->bpp, s->username,
                              s->password, data, SESMAN_SESSION_TYPE_XRDP);
    }

    e = scp_v1s_connect_new_session(c, display);
    switch (e)
    {
      case SCP_SERVER_STATE_OK:
        /* all ok, we got new username and password */
        break;
      case SCP_SERVER_STATE_NETWORK_ERR:
        log_message(LOG_LEVEL_WARNING, "libscp network error.");
        return;
      default:
	return;
    }
  }
  else if (scount == 1)
  {
    /* there's only one session - returning that */
    sitem = session_get_bypid(slist->SID);
#warning FIXME session_get_by*() should return a malloc()ated struct
#warning FIXME or at least lock the chain
    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, slist, display);
      log_message(LOG_LEVEL_INFO,
                  "User %s reconnected to session %d on port %d",
                  s->username, sitem->pid, display);
    }
    g_free(slist);
  }
  else
  {
    /* 2 or more disconnected sessions - listing */
    //max session x packet = 100 => pkt size = 1300 (13x100)
    e = scp_v1s_list_sessions(c, scount, slist, &sid);

    //CHECK RETURN

    g_free(slist);
  }

  /* resource management */
  if ((e == SCP_SERVER_STATE_OK) && (s->rsr))
  {
    /* here goes scp resource sharing code */
  }

  /* cleanup */ 
  free_session(s);
  auth_end(data); 
}