user_in.c

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/*
 * $Id: user_in.c 5340 2008-12-13 13:07:21Z klaus_darilion $
 *
 * Digest Authentication - Diameter support
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio 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
 * 
 * Kamailio 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * History:
 * -------
 *  
 *  
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h> 
#include <string.h>

/* memory management */
#include "../../mem/mem.h"
#include "../../mem/shm_mem.h"

/* printing messages, dealing with strings and other utils */
#include "../../dprint.h"
#include "../../str.h"
#include "../../ut.h"

/* digest parser headers */
#include "../../parser/digest/digest.h"
#include "../../parser/parse_uri.h"
#include "../../parser/parse_from.h"
#include "../../parser/parse_to.h"


/* headers defined by this module */
#include "diameter_msg.h"
#include "auth_diameter.h"
#include "defs.h"
#include "tcp_comm.h"


/* Get To header field URI */
static inline int get_to_uri(struct sip_msg* m, str* u)
{
     // check that the header field is there and is parsed
   if (!m->to && ((parse_headers(m, HDR_TO_F, 0) == -1)|| (!m->to))) 
   {
      LM_ERR("can't get To header field\n");
      return -1;
   }
   
   u->s   = ((struct to_body*)m->to->parsed)->uri.s;
   u->len = ((struct to_body*)m->to->parsed)->uri.len;
   
   return 0;
}


/* Get From header field URI */
static inline int get_from_uri(struct sip_msg* m, str* u)
{
     // check that the header field is there and is parsed
   if (parse_from_header(m) < 0) {
      LM_ERR("failed to parse From body\n");
      return -1;
   }
   
   u->s   = ((struct to_body*)m->from->parsed)->uri.s;
   u->len = ((struct to_body*)m->from->parsed)->uri.len;

   return 0;
}

/* it checks if a user is member of a group */
int diameter_is_user_in(struct sip_msg* _m, char* _hf, char* _group)
{
   str *grp, user_name, user, domain, uri;
   dig_cred_t* cred = 0;
   int hf_type;
   struct hdr_field* h;
   struct sip_uri puri;
   AAAMessage *req;
   AAA_AVP *avp; 
   int ret;
   unsigned int tmp;

   grp = (str*)_group; /* via fixup */

   hf_type = (int)(long)_hf;

   uri.s = 0;
   uri.len = 0;

   /* extract the uri according with the _hf parameter */
   switch(hf_type) 
   {
      case 1: /* Request-URI */
         uri = *(GET_RURI(_m));
      break;

      case 2: /* To */
         if (get_to_uri(_m, &uri) < 0) 
         {
            LM_ERR("failed to extract To\n");
            return -2;
         }
         break;

      case 3: /* From */
         if (get_from_uri(_m, &uri) < 0) 
         {
            LM_ERR("failed to extract From URI\n");
            return -3;
         }
         break;

      case 4: /* Credentials */
         get_authorized_cred(_m->authorization, &h);
         if (!h)  
         {
            get_authorized_cred(_m->proxy_auth, &h);
            if (!h) 
            {
               LM_ERR("no authorized credentials found "
                     "(error in scripts)\n");
               return -4;
            }
         }
         cred = &((auth_body_t*)(h->parsed))->digest;
         break;
   }

   if (hf_type != 4) 
   {
      if (parse_uri(uri.s, uri.len, &puri) < 0) 
      {
         LM_ERR("failed to parse URI\n");
         return -5;
      }
      user = puri.user;
      domain = puri.host;
   } 
   else
   {
      user = cred->username.user;
      domain = cred->realm;
   }
   
   /* user@domain mode */
   if (use_domain)
   {
      user_name.s = 0;
      user_name.len = user.len + domain.len;
      if(user_name.len>0)
      {
         user_name.len++;
         user_name.s = (char*)pkg_malloc(user_name.len);
         if (!user_name.s) 
         {
            LM_ERR("no pkg memory left\n");
            return -6;
         }
      
         memcpy(user_name.s, user.s, user.len);
         if(user.len>0)
         {
            user_name.s[user.len] = '@';
            memcpy(user_name.s + user.len + 1, domain.s, domain.len);
         }
         else
            memcpy(user_name.s, domain.s, domain.len);
      }
   } 
   else 
      user_name = user;
   
   
   if ( (req=AAAInMessage(AA_REQUEST, AAA_APP_NASREQ))==NULL)
   {
      LM_ERR("can't create new AAA message!\n");
      return -1;
   }
   
   /* Username AVP */
   if( (avp=AAACreateAVP(AVP_User_Name, 0, 0, user_name.s,
            user_name.len, AVP_DUPLICATE_DATA)) == 0)
   {
      LM_ERR("no more pkg memory!\n");
      goto error;
   }
   if( AAAAddAVPToMessage(req, avp, 0)!= AAA_ERR_SUCCESS)
   {
      LM_ERR("avp not added \n");
      goto error1;
   }

   /* Usergroup AVP */
   if( (avp=AAACreateAVP(AVP_User_Group, 0, 0, grp->s,
            grp->len, AVP_DUPLICATE_DATA)) == 0)
   {
      LM_ERR("no more pkg memory!\n");
      goto error;
   }
   if( AAAAddAVPToMessage(req, avp, 0)!= AAA_ERR_SUCCESS)
   {
      LM_ERR("avp not added \n");
      goto error1;
   }

   /* SIP_MSGID AVP */
   LM_DBG("******* m_id=%d\n", _m->id);
   tmp = _m->id;
   if( (avp=AAACreateAVP(AVP_SIP_MSGID, 0, 0, (char*)(&tmp), 
            sizeof(tmp), AVP_DUPLICATE_DATA)) == 0)
   {
      LM_ERR("no more pkg memory!\n");
      goto error;
   }
   if( AAAAddAVPToMessage(req, avp, 0)!= AAA_ERR_SUCCESS)
   {
      LM_ERR("avp not added \n");
      goto error1;
   }

   
   /* ServiceType AVP */
   if( (avp=AAACreateAVP(AVP_Service_Type, 0, 0, SIP_GROUP_CHECK, 
            SERVICE_LEN, AVP_DUPLICATE_DATA)) == 0)
   {
      LM_ERR("no more pkg memory!\n");
      goto error;
   }
   if( AAAAddAVPToMessage(req, avp, 0)!= AAA_ERR_SUCCESS)
   {
      LM_ERR("avp not added \n");
      goto error1;
   }
   

   /* Destination-Realm AVP */
   uri = *(GET_RURI(_m));
   parse_uri(uri.s, uri.len, &puri);
   if( (avp=AAACreateAVP(AVP_Destination_Realm, 0, 0, puri.host.s,
                  puri.host.len, AVP_DUPLICATE_DATA)) == 0)
   {
      LM_ERR("no more pkg memory!\n");
      goto error;
   }
   
   if( AAAAddAVPToMessage(req, avp, 0)!= AAA_ERR_SUCCESS)
   {
      LM_ERR("avp not added \n");
      goto error1;
   }
   
#ifdef DEBUG
   AAAPrintMessage(req);
#endif

   /* build a AAA message buffer */
   if(AAABuildMsgBuffer(req) != AAA_ERR_SUCCESS)
   {
      LM_ERR("message buffer not created\n");
      goto error;
   }

   if(sockfd==AAA_NO_CONNECTION)
   {
      sockfd = init_mytcp(diameter_client_host, diameter_client_port);
      if(sockfd==AAA_NO_CONNECTION)
      {
         LM_ERR("failed to reconnect to Diameter client\n");
         goto error;
      }
   }

   ret =tcp_send_recv(sockfd, req->buf.s, req->buf.len, rb, _m->id);

   if(ret == AAA_CONN_CLOSED)
   {
      LM_NOTICE("connection to Diameter client closed."
            "It will be reopened by the next request\n");
      close(sockfd);
      sockfd = AAA_NO_CONNECTION;
      goto error;
   }
   if(ret != AAA_USER_IN_GROUP)
   {
      LM_ERR("message sending to the DIAMETER backend authorization server"
            "failed or user is not in group\n");
      goto error;
   }
   
   AAAFreeMessage(&req);
   return 1;

error1:
   AAAFreeAVP(&avp);
error:
   AAAFreeMessage(&req);
   return -1;

}