src/main/auth.c

   1 /*
   2  * auth.c       User authentication.
   3  *
   4  * Version:     $Id$
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * Copyright 2000,2006  The FreeRADIUS server project
  21  * Copyright 2000  Miquel van Smoorenburg <miquels@cistron.nl>
  22  * Copyright 2000  Jeff Carneal <jeff@apex.net>
  23  */
  24
  25 #include <freeradius-devel/ident.h>
  26 RCSID("$Id$")
  27
  28 #include <freeradius-devel/radiusd.h>
  29 #include <freeradius-devel/modules.h>
  30 #include <freeradius-devel/rad_assert.h>
  31
  32 #include <ctype.h>
  33
  34 /*
  35  *      Return a short string showing the terminal server, port
  36  *      and calling station ID.
  37  */
  38 char *auth_name(char *buf, size_t buflen, REQUEST *request, int do_cli)
  39 {
  40         VALUE_PAIR      *cli;
  41         VALUE_PAIR      *pair;
  42         int             port = 0;
  43
  44         if ((cli = pairfind(request->packet->vps, PW_CALLING_STATION_ID)) == NULL)
  45                 do_cli = 0;
  46         if ((pair = pairfind(request->packet->vps, PW_NAS_PORT)) != NULL)
  47                 port = pair->vp_integer;
  48
  49         snprintf(buf, buflen, "from client %.128s port %u%s%.128s%s",
  50                         request->client->shortname, port,
  51                  (do_cli ? " cli " : ""), (do_cli ? (char *)cli->vp_strvalue : ""),
  52                  (request->packet->dst_port == 0) ? " via TLS tunnel" : "");
  53
  54         return buf;
  55 }
  56
  57
  58
  59 /*
  60  * Make sure user/pass are clean
  61  * and then log them
  62  */
  63 static int rad_authlog(const char *msg, REQUEST *request, int goodpass) {
  64
  65         char clean_password[1024];
  66         char clean_username[1024];
  67         char buf[1024];
  68         VALUE_PAIR *username = NULL;
  69
  70         if (!request->root->log_auth) {
  71                 return 0;
  72         }
  73
  74         /*
  75          * Get the correct username based on the configured value
  76          */
  77         if (log_stripped_names == 0) {
  78                 username = pairfind(request->packet->vps, PW_USER_NAME);
  79         } else {
  80                 username = request->username;
  81         }
  82
  83         /*
  84          *      Clean up the username
  85          */
  86         if (username == NULL) {
  87                 strcpy(clean_username, "<no User-Name attribute>");
  88         } else {
  89                 librad_safeprint((char *)username->vp_strvalue,
  90                                 username->length,
  91                                 clean_username, sizeof(clean_username));
  92         }
  93
  94         /*
  95          *      Clean up the password
  96          */
  97         if (request->root->log_auth_badpass || request->root->log_auth_goodpass) {
  98                 if (!request->password) {
  99                         VALUE_PAIR *auth_type;
 100
 101                         auth_type = pairfind(request->config_items,
 102                                              PW_AUTH_TYPE);
 103                         if (auth_type && (auth_type->vp_strvalue[0] != '\0')) {
 104                                 snprintf(clean_password, sizeof(clean_password),
 105                                          "<via Auth-Type = %s>",
 106                                          auth_type->vp_strvalue);
 107                         } else {
 108                                 strcpy(clean_password, "<no User-Password attribute>");
 109                         }
 110                 } else if (pairfind(request->packet->vps, PW_CHAP_PASSWORD)) {
 111                         strcpy(clean_password, "<CHAP-Password>");
 112                 } else {
 113                         librad_safeprint((char *)request->password->vp_strvalue,
 114                                          request->password->length,
 115                                          clean_password, sizeof(clean_password));
 116                 }
 117         }
 118
 119         if (goodpass) {
 120                 radlog(L_AUTH, "%s: [%s%s%s] (%s)",
 121                                 msg,
 122                                 clean_username,
 123                                 request->root->log_auth_goodpass ? "/" : "",
 124                                 request->root->log_auth_goodpass ? clean_password : "",
 125                                 auth_name(buf, sizeof(buf), request, 1));
 126         } else {
 127                 radlog(L_AUTH, "%s: [%s%s%s] (%s)",
 128                                 msg,
 129                                 clean_username,
 130                                 request->root->log_auth_badpass ? "/" : "",
 131                                 request->root->log_auth_badpass ? clean_password : "",
 132                                 auth_name(buf, sizeof(buf), request, 1));
 133         }
 134
 135         return 0;
 136 }
 137
 138 /*
 139  *      Check password.
 140  *
 141  *      Returns:        0  OK
 142  *                      -1 Password fail
 143  *                      -2 Rejected (Auth-Type = Reject, send Port-Message back)
 144  *                      1  End check & return, don't reply
 145  *
 146  *      NOTE: NOT the same as the RLM_ values !
 147  */
 148 static int rad_check_password(REQUEST *request)
 149 {
 150         VALUE_PAIR *auth_type_pair;
 151         VALUE_PAIR *cur_config_item;
 152         VALUE_PAIR *password_pair;
 153         VALUE_PAIR *auth_item;
 154         uint8_t my_chap[MAX_STRING_LEN];
 155         int auth_type = -1;
 156         int result;
 157         int auth_type_count = 0;
 158         result = 0;
 159
 160         /*
 161          *      Look for matching check items. We skip the whole lot
 162          *      if the authentication type is PW_AUTHTYPE_ACCEPT or
 163          *      PW_AUTHTYPE_REJECT.
 164          */
 165         cur_config_item = request->config_items;
 166         while(((auth_type_pair = pairfind(cur_config_item, PW_AUTH_TYPE))) != NULL) {
 167                 auth_type = auth_type_pair->vp_integer;
 168                 auth_type_count++;
 169
 170                 DEBUG2("  rad_check_password:  Found Auth-Type %s",
 171                                 auth_type_pair->vp_strvalue);
 172                 cur_config_item = auth_type_pair->next;
 173
 174                 if (auth_type == PW_AUTHTYPE_REJECT) {
 175                         DEBUG2("  rad_check_password: Auth-Type = Reject, rejecting user");
 176                         return -2;
 177                 }
 178         }
 179
 180         if (( auth_type_count > 1) && (debug_flag)) {
 181                 radlog(L_ERR, "Warning:  Found %d auth-types on request for user '%s'",
 182                         auth_type_count, request->username->vp_strvalue);
 183         }
 184
 185         /*
 186          *      This means we have a proxy reply or an accept
 187          *  and it wasn't rejected in the above loop.  So
 188          *  that means it is accepted and we do no further
 189          *  authentication
 190          */
 191         if ((auth_type == PW_AUTHTYPE_ACCEPT) || (request->proxy)) {
 192                 DEBUG2("  rad_check_password: Auth-Type = Accept, accepting the user");
 193                 return 0;
 194         }
 195
 196         password_pair =  pairfind(request->config_items, PW_USER_PASSWORD);
 197         if (password_pair &&
 198             pairfind(request->config_items, PW_CLEARTEXT_PASSWORD)) {
 199                 pairdelete(&request->config_items, PW_USER_PASSWORD);
 200                 password_pair = NULL;
 201         }
 202
 203         if (password_pair) {
 204                 DICT_ATTR *da;
 205
 206                 DEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 207                 DEBUG("!!!    Replacing User-Password in config items with Cleartext-Password.     !!!");
 208                 DEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 209                 DEBUG("!!! Please update your configuration so that the \"known good\"               !!!");
 210                 DEBUG("!!! clear text password is in Cleartext-Password, and not in User-Password. !!!");
 211                 DEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 212                 password_pair->attribute = PW_CLEARTEXT_PASSWORD;
 213                 da = dict_attrbyvalue(PW_CLEARTEXT_PASSWORD);
 214                 if (!da) {
 215                         radlog(L_ERR, "FATAL: You broke the dictionaries.  Please use the default dictionaries!");
 216                         _exit(1);
 217                 }
 218
 219                 password_pair->name = da->name;
 220         }
 221
 222         /*
 223          *      Find the "known good" password.
 224          *
 225          *      FIXME: We should get rid of these hacks, and replace
 226          *      them with a module.
 227          */
 228         if ((password_pair = pairfind(request->config_items, PW_CRYPT_PASSWORD)) != NULL) {
 229                 /*
 230                  *      Re-write Auth-Type, but ONLY if it isn't already
 231                  *      set.
 232                  */
 233                 if (auth_type == -1) auth_type = PW_AUTHTYPE_CRYPT;
 234         } else {
 235                 password_pair = pairfind(request->config_items, PW_CLEARTEXT_PASSWORD);
 236         }
 237
 238         if (auth_type < 0) {
 239                 if (password_pair) {
 240                         auth_type = PW_AUTHTYPE_LOCAL;
 241                 } else {
 242                         /*
 243                         *       The admin hasn't told us how to
 244                         *       authenticate the user, so we reject them!
 245                         *
 246                         *       This is fail-safe.
 247                         */
 248                         DEBUG2("auth: No authenticate method (Auth-Type) configuration found for the request: Rejecting the user");
 249                         return -2;
 250                 }
 251         }
 252
 253         switch(auth_type) {
 254                 DICT_VALUE *dval;
 255
 256                 case PW_AUTHTYPE_CRYPT:
 257                         /*
 258                          *      Find the password sent by the user. It
 259                          *      SHOULD be there, if it's not
 260                          *      authentication fails.
 261                          */
 262                         auth_item = request->password;
 263                         if (auth_item == NULL) {
 264                                 DEBUG2("auth: No User-Password or CHAP-Password attribute in the request");
 265                                 return -1;
 266                         }
 267
 268                         DEBUG2("auth: type Crypt");
 269                         if (password_pair == NULL) {
 270                                 DEBUG2("No Crypt-Password configured for the user");
 271                                 rad_authlog("Login incorrect "
 272                                         "(No Crypt-Password configured for the user)", request, 0);
 273                                 return -1;
 274                         }
 275
 276                         switch (fr_crypt_check((char *)auth_item->vp_strvalue,
 277                                                                          (char *)password_pair->vp_strvalue)) {
 278                         case -1:
 279                           rad_authlog("Login incorrect "
 280                                                   "(system failed to supply an encrypted password for comparison)", request, 0);
 281                         case 1:
 282                           return -1;
 283                         }
 284                         break;
 285                 case PW_AUTHTYPE_LOCAL:
 286                         DEBUG2("auth: type Local");
 287
 288                         /*
 289                          *      Find the password sent by the user. It
 290                          *      SHOULD be there, if it's not
 291                          *      authentication fails.
 292                          */
 293                         auth_item = request->password;
 294                         if (!auth_item)
 295                                 auth_item = pairfind(request->packet->vps,
 296                                                      PW_CHAP_PASSWORD);
 297                         if (!auth_item) {
 298                                 DEBUG2("auth: No User-Password or CHAP-Password attribute in the request");
 299                                 return -1;
 300                         }
 301
 302                         /*
 303                          *      Plain text password.
 304                          */
 305                         if (password_pair == NULL) {
 306                                 DEBUG2("auth: No password configured for the user");
 307                                 rad_authlog("Login incorrect "
 308                                         "(No password configured for the user)", request, 0);
 309                                 return -1;
 310                         }
 311
 312                         /*
 313                          *      Local password is just plain text.
 314                          */
 315                         if (auth_item->attribute == PW_USER_PASSWORD) {
 316                                 if (strcmp((char *)password_pair->vp_strvalue,
 317                                            (char *)auth_item->vp_strvalue) != 0) {
 318                                         DEBUG2("auth: user supplied User-Password does NOT match local User-Password");
 319                                         return -1;
 320                                 }
 321                                 DEBUG2("auth: user supplied User-Password matches local User-Password");
 322                                 break;
 323
 324                         } else if (auth_item->attribute != PW_CHAP_PASSWORD) {
 325                                 DEBUG2("The user did not supply a User-Password or a CHAP-Password attribute");
 326                                 rad_authlog("Login incorrect "
 327                                         "(no User-Password or CHAP-Password attribute)", request, 0);
 328                                 return -1;
 329                         }
 330
 331                         rad_chap_encode(request->packet, my_chap,
 332                                         auth_item->vp_octets[0], password_pair);
 333
 334                         /*
 335                          *      Compare them
 336                          */
 337                         if (memcmp(my_chap + 1, auth_item->vp_strvalue + 1,
 338                                    CHAP_VALUE_LENGTH) != 0) {
 339                                 DEBUG2("auth: user supplied CHAP-Password does NOT match local User-Password");
 340                                 return -1;
 341                         }
 342                         DEBUG2("auth: user supplied CHAP-Password matches local User-Password");
 343                         break;
 344                 default:
 345                         dval = dict_valbyattr(PW_AUTH_TYPE, auth_type);
 346                         if (dval) {
 347                                 DEBUG2("auth: type \"%s\"", dval->name);
 348                         } else {
 349                                 DEBUG2("auth: type UNKNOWN-%d", auth_type);
 350                         }
 351
 352                         /*
 353                          *      See if there is a module that handles
 354                          *      this type, and turn the RLM_ return
 355                          *      status into the values as defined at
 356                          *      the top of this function.
 357                          */
 358                         result = module_authenticate(auth_type, request);
 359                         switch (result) {
 360                                 /*
 361                                  *      An authentication module FAIL
 362                                  *      return code, or any return code that
 363                                  *      is not expected from authentication,
 364                                  *      is the same as an explicit REJECT!
 365                                  */
 366                                 case RLM_MODULE_FAIL:
 367                                 case RLM_MODULE_INVALID:
 368                                 case RLM_MODULE_NOOP:
 369                                 case RLM_MODULE_NOTFOUND:
 370                                 case RLM_MODULE_REJECT:
 371                                 case RLM_MODULE_UPDATED:
 372                                 case RLM_MODULE_USERLOCK:
 373                                 default:
 374                                         result = -1;
 375                                         break;
 376                                 case RLM_MODULE_OK:
 377                                         result = 0;
 378                                         break;
 379                                 case RLM_MODULE_HANDLED:
 380                                         result = 1;
 381                                         break;
 382                         }
 383                         break;
 384         }
 385
 386         return result;
 387 }
 388
 389 /*
 390  *      Post-authentication step processes the response before it is
 391  *      sent to the NAS. It can receive both Access-Accept and Access-Reject
 392  *      replies.
 393  */
 394 int rad_postauth(REQUEST *request)
 395 {
 396         int     result;
 397         int     postauth_type = 0;
 398         VALUE_PAIR *vp;
 399
 400         /*
 401          *      Do post-authentication calls. ignoring the return code.
 402          */
 403         vp = pairfind(request->config_items, PW_POST_AUTH_TYPE);
 404         if (vp) {
 405                 DEBUG2("  Found Post-Auth-Type %s", vp->vp_strvalue);
 406                 postauth_type = vp->vp_integer;
 407         }
 408         result = module_post_auth(postauth_type, request);
 409         switch (result) {
 410                 /*
 411                  *      The module failed, or said to reject the user: Do so.
 412                  */
 413                 case RLM_MODULE_FAIL:
 414                 case RLM_MODULE_INVALID:
 415                 case RLM_MODULE_REJECT:
 416                 case RLM_MODULE_USERLOCK:
 417                 default:
 418                         request->reply->code = PW_AUTHENTICATION_REJECT;
 419                         result = RLM_MODULE_REJECT;
 420                         break;
 421                 /*
 422                  *      The module handled the request, cancel the reply.
 423                  */
 424                 case RLM_MODULE_HANDLED:
 425                         /* FIXME */
 426                         break;
 427                 /*
 428                  *      The module had a number of OK return codes.
 429                  */
 430                 case RLM_MODULE_NOOP:
 431                 case RLM_MODULE_NOTFOUND:
 432                 case RLM_MODULE_OK:
 433                 case RLM_MODULE_UPDATED:
 434                         result = RLM_MODULE_OK;
 435                         break;
 436         }
 437         return result;
 438 }
 439
 440 /*
 441  *      Process and reply to an authentication request
 442  *
 443  *      The return value of this function isn't actually used right now, so
 444  *      it's not entirely clear if it is returning the right things. --Pac.
 445  */
 446 int rad_authenticate(REQUEST *request)
 447 {
 448         VALUE_PAIR      *namepair;
 449         VALUE_PAIR      *check_item;
 450         VALUE_PAIR      *auth_item;
 451         VALUE_PAIR      *module_msg;
 452         VALUE_PAIR      *tmp = NULL;
 453         int             result;
 454         char            umsg[MAX_STRING_LEN + 1];
 455         const char      *user_msg = NULL;
 456         const char      *password;
 457         char            logstr[1024];
 458         char            autz_retry = 0;
 459         int             autz_type = 0;
 460
 461         password = "";
 462
 463         /*
 464          *      If this request got proxied to another server, we need
 465          *      to check whether it authenticated the request or not.
 466          */
 467         if (request->proxy_reply) {
 468                 switch (request->proxy_reply->code) {
 469                 /*
 470                  *      Reply of ACCEPT means accept, thus set Auth-Type
 471                  *      accordingly.
 472                  */
 473                 case PW_AUTHENTICATION_ACK:
 474                         tmp = radius_paircreate(request,
 475                                                 &request->config_items,
 476                                                 PW_AUTH_TYPE, PW_TYPE_INTEGER);
 477                         if (tmp) tmp->vp_integer = PW_AUTHTYPE_ACCEPT;
 478                         break;
 479                 /*
 480                  *      Challenges are punted back to the NAS without any
 481                  *      further processing.
 482                  */
 483                 case PW_ACCESS_CHALLENGE:
 484                         request->reply->code = PW_ACCESS_CHALLENGE;
 485                         return RLM_MODULE_OK;
 486                 /*
 487                  *      ALL other replies mean reject. (this is fail-safe)
 488                  *
 489                  *      Do NOT do any authorization or authentication. They
 490                  *      are being rejected, so we minimize the amount of work
 491                  *      done by the server, by rejecting them here.
 492                  */
 493                 case PW_AUTHENTICATION_REJECT:
 494                 default:
 495                         rad_authlog("Login incorrect (Home Server says so)",
 496                                     request, 0);
 497                         request->reply->code = PW_AUTHENTICATION_REJECT;
 498                         return RLM_MODULE_REJECT;
 499                 }
 500         }
 501
 502         /*
 503          *      Get the username from the request.
 504          *
 505          *      Note that namepair MAY be NULL, in which case there
 506          *      is no User-Name attribute in the request.
 507          */
 508         namepair = request->username;
 509
 510         /*
 511          *      Look for, and cache, passwords.
 512          */
 513         if (!request->password) {
 514                 request->password = pairfind(request->packet->vps,
 515                                              PW_USER_PASSWORD);
 516         }
 517
 518         /*
 519          *      Discover which password we want to use.
 520          */
 521         auth_item = request->password;
 522         if (auth_item) {
 523                 password = (const char *)auth_item->vp_strvalue;
 524
 525         } else {
 526                 /*
 527                  *      Maybe there's a CHAP-Password?
 528                  */
 529                 if ((auth_item = pairfind(request->packet->vps,
 530                                           PW_CHAP_PASSWORD)) != NULL) {
 531                         password = "<CHAP-PASSWORD>";
 532
 533                 } else {
 534                         /*
 535                          *      No password we recognize.
 536                          */
 537                         password = "<NO-PASSWORD>";
 538                 }
 539         }
 540         request->password = auth_item;
 541
 542         /*
 543          *      Get the user's authorization information from the database
 544          */
 545 autz_redo:
 546         result = module_authorize(autz_type, request);
 547         switch (result) {
 548                 case RLM_MODULE_NOOP:
 549                 case RLM_MODULE_NOTFOUND:
 550                 case RLM_MODULE_OK:
 551                 case RLM_MODULE_UPDATED:
 552                         break;
 553                 case RLM_MODULE_HANDLED:
 554                         return result;
 555                 case RLM_MODULE_FAIL:
 556                 case RLM_MODULE_INVALID:
 557                 case RLM_MODULE_REJECT:
 558                 case RLM_MODULE_USERLOCK:
 559                 default:
 560                         if ((module_msg = pairfind(request->packet->vps,
 561                                         PW_MODULE_FAILURE_MESSAGE)) != NULL) {
 562                                 char msg[MAX_STRING_LEN + 16];
 563                                 snprintf(msg, sizeof(msg), "Invalid user (%s)",
 564                                          module_msg->vp_strvalue);
 565                                 rad_authlog(msg,request,0);
 566                         } else {
 567                                 rad_authlog("Invalid user", request, 0);
 568                         }
 569                         request->reply->code = PW_AUTHENTICATION_REJECT;
 570                         return result;
 571         }
 572         if (!autz_retry) {
 573                 tmp = pairfind(request->config_items, PW_AUTZ_TYPE);
 574                 if (tmp) {
 575                         DEBUG2("  Found Autz-Type %s", tmp->vp_strvalue);
 576                         autz_type = tmp->vp_integer;
 577                         autz_retry = 1;
 578                         goto autz_redo;
 579                 }
 580         }
 581
 582         /*
 583          *      If we haven't already proxied the packet, then check
 584          *      to see if we should.  Maybe one of the authorize
 585          *      modules has decided that a proxy should be used. If
 586          *      so, get out of here and send the packet.
 587          */
 588         if ((request->proxy == NULL) &&
 589             ((tmp = pairfind(request->config_items, PW_PROXY_TO_REALM)) != NULL)) {
 590                 REALM *realm;
 591
 592                 realm = realm_find(tmp->vp_strvalue);
 593
 594                 /*
 595                  *      Don't authenticate, as the request is going to
 596                  *      be proxied.
 597                  */
 598                 if (realm && realm->auth_pool) {
 599                         return RLM_MODULE_OK;
 600                 }
 601
 602                 /*
 603                  *      Catch users who set Proxy-To-Realm to a LOCAL
 604                  *      realm (sigh).  But don't complain if it is
 605                  *      *the* LOCAL realm.
 606                  */
 607                 if (realm &&(strcmp(realm->name, "LOCAL") != 0)) {
 608                         DEBUG2("  WARNING: You set Proxy-To-Realm = %s, but it is a LOCAL realm!  Cancelling invalid proxy request.", realm->name);
 609                 }
 610
 611                 if (!realm) {
 612                         DEBUG2("  WARNING: You set Proxy-To-Realm = %s, but the realm does not exist!  Cancelling invalid proxy request.", tmp->vp_strvalue);
 613                 }
 614         }
 615
 616         /*
 617          *      Perhaps there is a Stripped-User-Name now.
 618          */
 619         namepair = request->username;
 620
 621         /*
 622          *      Validate the user
 623          */
 624         do {
 625                 result = rad_check_password(request);
 626                 if (result > 0) {
 627                         /* don't reply! */
 628                         return RLM_MODULE_HANDLED;
 629                 }
 630         } while(0);
 631
 632         /*
 633          *      Failed to validate the user.
 634          *
 635          *      We PRESUME that the code which failed will clean up
 636          *      request->reply->vps, to be ONLY the reply items it
 637          *      wants to send back.
 638          */
 639         if (result < 0) {
 640                 DEBUG2("auth: Failed to validate the user.");
 641                 request->reply->code = PW_AUTHENTICATION_REJECT;
 642
 643                 if ((module_msg = pairfind(request->packet->vps,PW_MODULE_FAILURE_MESSAGE)) != NULL){
 644                         char msg[MAX_STRING_LEN+19];
 645
 646                         snprintf(msg, sizeof(msg), "Login incorrect (%s)",
 647                                  module_msg->vp_strvalue);
 648                         rad_authlog(msg, request, 0);
 649                 } else {
 650                         rad_authlog("Login incorrect", request, 0);
 651                 }
 652
 653                 /* double check: maybe the secret is wrong? */
 654                 if ((debug_flag > 1) && (auth_item != NULL) &&
 655                                 (auth_item->attribute == PW_USER_PASSWORD)) {
 656                         char *p;
 657
 658                         p = auth_item->vp_strvalue;
 659                         while (*p != '\0') {
 660                                 if (!isprint((int) *p)) {
 661                                         log_debug("  WARNING: Unprintable characters in the password.\n\t  Double-check the shared secret on the server and the NAS!");
 662                                         break;
 663                                 }
 664                                 p++;
 665                         }
 666                 }
 667         }
 668
 669         if (result >= 0 &&
 670             (check_item = pairfind(request->config_items, PW_SIMULTANEOUS_USE)) != NULL) {
 671                 int r, session_type = 0;
 672
 673                 tmp = pairfind(request->config_items, PW_SESSION_TYPE);
 674                 if (tmp) {
 675                         DEBUG2("  Found Session-Type %s", tmp->vp_strvalue);
 676                         session_type = tmp->vp_integer;
 677                 }
 678
 679                 /*
 680                  *      User authenticated O.K. Now we have to check
 681                  *      for the Simultaneous-Use parameter.
 682                  */
 683                 if (namepair &&
 684                     (r = module_checksimul(session_type, request, check_item->vp_integer)) != 0) {
 685                         char mpp_ok = 0;
 686
 687                         if (r == 2){
 688                                 /* Multilink attempt. Check if port-limit > simultaneous-use */
 689                                 VALUE_PAIR *port_limit;
 690
 691                                 if ((port_limit = pairfind(request->reply->vps, PW_PORT_LIMIT)) != NULL &&
 692                                         port_limit->vp_integer > check_item->vp_integer){
 693                                         DEBUG2("main auth: MPP is OK");
 694                                         mpp_ok = 1;
 695                                 }
 696                         }
 697                         if (!mpp_ok){
 698                                 if (check_item->vp_integer > 1) {
 699                                 snprintf(umsg, sizeof(umsg),
 700                                                         "\r\nYou are already logged in %d times  - access denied\r\n\n",
 701                                                         (int)check_item->vp_integer);
 702                                         user_msg = umsg;
 703                                 } else {
 704                                         user_msg = "\r\nYou are already logged in - access denied\r\n\n";
 705                                 }
 706
 707                                 request->reply->code = PW_AUTHENTICATION_REJECT;
 708
 709                                 /*
 710                                  *      They're trying to log in too many times.
 711                                  *      Remove ALL reply attributes.
 712                                  */
 713                                 pairfree(&request->reply->vps);
 714                                 radius_pairmake(request, &request->reply->vps,
 715                                                 "Reply-Message",
 716                                                 user_msg, T_OP_SET);
 717
 718                                 snprintf(logstr, sizeof(logstr), "Multiple logins (max %d) %s",
 719                                         check_item->vp_integer,
 720                                         r == 2 ? "[MPP attempt]" : "");
 721                                 rad_authlog(logstr, request, 1);
 722
 723                                 result = -1;
 724                         }
 725                 }
 726         }
 727
 728         /*
 729          *      Result should be >= 0 here - if not, it means the user
 730          *      is rejected, so we just process post-auth and return.
 731          */
 732         if (result < 0) {
 733                 return RLM_MODULE_REJECT;
 734         }
 735
 736         /*
 737          *      We might need this later.  The 'password' string
 738          *      is NOT used anywhere below here, except for logging,
 739          *      so it should be safe...
 740          */
 741         if ((auth_item != NULL) && (auth_item->attribute == PW_CHAP_PASSWORD)) {
 742                 password = "CHAP-Password";
 743         }
 744
 745         /*
 746          *      Add the port number to the Framed-IP-Address if
 747          *      vp->addport is set.
 748          */
 749         if (((tmp = pairfind(request->reply->vps,
 750                              PW_FRAMED_IP_ADDRESS)) != NULL) &&
 751             (tmp->flags.addport != 0)) {
 752                 VALUE_PAIR *vpPortId;
 753
 754                 /*
 755                  *  Find the NAS port ID.
 756                  */
 757                 if ((vpPortId = pairfind(request->packet->vps,
 758                                          PW_NAS_PORT)) != NULL) {
 759                   unsigned long tvalue = ntohl(tmp->vp_integer);
 760                   tmp->vp_integer = htonl(tvalue + vpPortId->vp_integer);
 761                   tmp->flags.addport = 0;
 762                   ip_ntoa(tmp->vp_strvalue, tmp->vp_integer);
 763                 } else {
 764                         DEBUG2("WARNING: No NAS-Port attribute in request.  CANNOT return a Framed-IP-Address + NAS-Port.\n");
 765                         pairdelete(&request->reply->vps, PW_FRAMED_IP_ADDRESS);
 766                 }
 767         }
 768
 769         /*
 770          *      Set the reply to Access-Accept, if it hasn't already
 771          *      been set to something.  (i.e. Access-Challenge)
 772          */
 773         if (request->reply->code == 0)
 774           request->reply->code = PW_AUTHENTICATION_ACK;
 775
 776         if ((module_msg = pairfind(request->packet->vps,PW_MODULE_SUCCESS_MESSAGE)) != NULL){
 777                 char msg[MAX_STRING_LEN+12];
 778
 779                 snprintf(msg, sizeof(msg), "Login OK (%s)",
 780                          module_msg->vp_strvalue);
 781                 rad_authlog(msg, request, 1);
 782         } else {
 783                 rad_authlog("Login OK", request, 1);
 784         }
 785
 786         /*
 787          *      Run the modules in the 'post-auth' section.
 788          */
 789         result = rad_postauth(request);
 790
 791         return result;
 792 }