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radius.c

/*
 * $Id: radius.c,v 1.2 1997/12/25 23:28:55 lf Exp $
 *
 * Copyright (C) 1996 Lars Fenneberg
 *
 * See the file COPYRIGHT for the respective terms and conditions. 
 * If the file is missing contact me at lf@elemental.net 
 * and I'll send you a copy.
 *
 */

#include <config.h>
#include <includes.h>
#include <radiusclient.h>
#include <messages.h>
#include <radlogin.h>

extern ENV *env;

LFUNC auth_radius(UINT4 client_port, char *username, char *passwd)
{

      VALUE_PAIR  *send, *received, *vp, *service_vp;
      UINT4       service, ftype, ctype;
      char        msg[4096], *p, username_realm[256];
      char            name[2048], value[2048]; /* more than enough */
      int         result;
      char        *default_realm, *service_str, *ftype_str;
      DICT_VALUE  *dval;

      send = received = NULL;

      /*
       * Determine and fill in Service-Type
       */

#ifdef SCP
      /* determine based on the username what kind of service is requested.
         this allows you to use one password for all accounts, but the
         Merit radiusd supplies you just with the right information you
         need for the specified service type    -lf, 03/15/96 */

      switch (*username)
      {
            case 'S':
                        service = PW_FRAMED;
                        ftype = PW_SLIP;
                        ctype = 0;
                        username++;
                        break;
            case 'C':
                        service = PW_FRAMED;
                        ftype = PW_SLIP;
                        ctype = PW_VAN_JACOBSON_TCP_IP;
                        username++;
                        break;
            case 'P':
                        service = PW_FRAMED;
                        ftype = PW_PPP;
                        ctype = 0;
                        username++;
                        break;
            default:
                        service = PW_LOGIN;
                        ftype = 0;
                        ctype = 0;
                        break;
      }
#else
      service = PW_LOGIN;     
      ftype = 0;
      ctype = 0;
#endif

      if (rc_avpair_add(&send, PW_SERVICE_TYPE, &service, 0) == NULL)
            return (LFUNC) NULL;

      /* Fill in Framed-Protocol, if neccessary */
      
      if (ftype != 0)
      {
            if (rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &ftype, 0) == NULL)
                  return (LFUNC) NULL;    
      } 

      /* Fill in Framed-Compression, if neccessary */

      if (ctype != 0)
      {
            if (rc_avpair_add(&send, PW_FRAMED_COMPRESSION, &ctype, 0) == NULL)
                  return (LFUNC) NULL;
      } 
       
      /*
       * Fill in User-Name
       */

       strncpy(username_realm, username, sizeof(username_realm));

       /* Append default realm */
       default_realm = rc_conf_str("default_realm");

       if ((strchr(username_realm, '@') == NULL) && default_realm &&
           ((*default_realm) != '\0'))
       {
            strncat(username_realm, "@", sizeof(username_realm));
            strncat(username_realm, default_realm, sizeof(username_realm));
       } 

      if (rc_avpair_add(&send, PW_USER_NAME, username_realm, 0) == NULL)
            return (LFUNC) NULL;
      
      /*
       * Fill in User-Password
       */
       
      if (rc_avpair_add(&send, PW_USER_PASSWORD, passwd, 0) == NULL)      
            return (LFUNC) NULL;
      
      result = rc_auth(client_port, send, &received, msg);

      if (result == OK_RC)
      {
            /* Set up a running count of attributes saved. */
            int acount[256], attr;
            
            memset(acount, 0, sizeof(acount));

            rc_add_env(env, "RADIUS_USER_NAME", username);
            
            vp = received;

            /* map-- keep track of the attributes so that we know
               when to add the delimiters. Note that we can only
               handle attributes < 256, which is the standard anyway. */
            
            while (vp)
            {
                  strcpy(name, "RADIUS_");
                  if (rc_avpair_tostr(vp, name+7, sizeof(name)-7, value, sizeof(value)) < 0) {
                        rc_avpair_free(send);
                        rc_avpair_free(received);
                        return (LFUNC) NULL;                
                  }
                  
                  /* Translate "-" => "_" and uppercase*/
                  for(p = name; *p; p++) {
                        *p = toupper(*p);
                        if (*p == '-') *p = '_';
                  }
            
                  /* Add to the attribute count and append the var
                     if necessary. */
                  if ((attr = vp->attribute) < 256)
                  {
                        int count;
                        if ((count = acount[attr]++) > 0) {
                              char buf[10];
                              sprintf(buf, "_%d", count);
                              strcat(name,buf);
                        }
                  }
                  
                  if (rc_add_env(env, name, value) < 0)
                  {
                        rc_avpair_free(send);
                        rc_avpair_free(received);
                        return (LFUNC) NULL;                
                  }
                              
                  vp = vp->next;
            }
            
            service_str = "(unknown)";
            ftype_str = NULL;

            if ((service_vp = rc_avpair_get(received, PW_SERVICE_TYPE)) != NULL)
                        if ((dval = rc_dict_getval(service_vp->lvalue, service_vp->name)) != NULL) {
                              service_str = dval->name;
                        }

            if (service_vp && (service_vp->lvalue == PW_FRAMED) &&
                  ((vp = rc_avpair_get(received, PW_FRAMED_PROTOCOL)) != NULL))
                        if ((dval = rc_dict_getval(vp->lvalue, vp->name)) != NULL) {
                              ftype_str = dval->name;
                        }

            rc_log(LOG_NOTICE, "authentication OK, username %s, service %s%s%s",
                        username, service_str,(ftype_str)?"/":"", (ftype_str)?ftype_str:"");

            if (msg && (*msg != '\0'))
                  printf(SC_SERVER_REPLY, msg);
            else
                  printf(SC_RADIUS_OK);
            
            rc_avpair_free(send);
            rc_avpair_free(received);

            return radius_login;
      }
      else
      {
            rc_log(LOG_NOTICE, "authentication FAILED, type RADIUS, username %s", 
                     username_realm);  
            if (msg && (*msg != '\0'))
                  printf(SC_SERVER_REPLY, msg);
            else
                  printf(SC_RADIUS_FAILED);
      }
      
      rc_avpair_free(send);
      if (received)
            rc_avpair_free(received);
      
      return (LFUNC) NULL;
}

void
radius_login(char *username)
{
      char *login_radius = rc_conf_str("login_radius");

      execle(login_radius, login_radius, NULL, env->env);

      rc_log(LOG_ERR, "couldn't execute %s: %s", login_radius, strerror(errno));
      fprintf(stderr, "couldn't execute %s: %s", login_radius, strerror(errno));

      sleep(1);   /* give the user time to read */
      exit(ERROR_RC);
}

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