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, 0)) == NULL)
  45                 do_cli = 0;
  46         if ((pair = pairfind(request->packet->vps, PW_NAS_PORT, 0)) != 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         int logit;
  66         const char *extra_msg = NULL;
  67         char clean_password[1024];
  68         char clean_username[1024];
  69         char buf[1024];
  70         char extra[1024];
  71         VALUE_PAIR *username = NULL;
  72
  73         if (!request->root->log_auth) {
  74                 return 0;
  75         }
  76
  77         /*
  78          * Get the correct username based on the configured value
  79          */
  80         if (log_stripped_names == 0) {
  81                 username = pairfind(request->packet->vps, PW_USER_NAME, 0);
  82         } else {
  83                 username = request->username;
  84         }
  85
  86         /*
  87          *      Clean up the username
  88          */
  89         if (username == NULL) {
  90                 strcpy(clean_username, "<no User-Name attribute>");
  91         } else {
  92                 fr_print_string((char *)username->vp_strvalue,
  93                                 username->length,
  94                                 clean_username, sizeof(clean_username));
  95         }
  96
  97         /*
  98          *      Clean up the password
  99          */
 100         if (request->root->log_auth_badpass || request->root->log_auth_goodpass) {
 101                 if (!request->password) {
 102                         VALUE_PAIR *auth_type;
 103
 104                         auth_type = pairfind(request->config_items,
 105                                              PW_AUTH_TYPE, 0);
 106                         if (auth_type && (auth_type->vp_strvalue[0] != '\0')) {
 107                                 snprintf(clean_password, sizeof(clean_password),
 108                                          "<via Auth-Type = %s>",
 109                                          auth_type->vp_strvalue);
 110                         } else {
 111                                 strcpy(clean_password, "<no User-Password attribute>");
 112                         }
 113                 } else if (pairfind(request->packet->vps, PW_CHAP_PASSWORD, 0)) {
 114                         strcpy(clean_password, "<CHAP-Password>");
 115                 } else {
 116                         fr_print_string((char *)request->password->vp_strvalue,
 117                                          request->password->length,
 118                                          clean_password, sizeof(clean_password));
 119                 }
 120         }
 121
 122         if (goodpass) {
 123                 logit = request->root->log_auth_goodpass;
 124                 extra_msg = request->root->auth_goodpass_msg;
 125         } else {
 126                 logit = request->root->log_auth_badpass;
 127                 extra_msg = request->root->auth_badpass_msg;
 128         }
 129
 130         if (extra_msg) {
 131                 extra[0] = ' ';
 132                 radius_xlat(extra + 1, sizeof(extra) - 1, extra_msg, request,
 133                             NULL);
 134         } else {
 135                 *extra = '\0';
 136         }
 137
 138         radlog_request(L_AUTH, 0, request, "%s: [%s%s%s] (%s)%s",
 139                        msg,
 140                        clean_username,
 141                        logit ? "/" : "",
 142                        logit ? clean_password : "",
 143                        auth_name(buf, sizeof(buf), request, 1),
 144                        extra);
 145
 146         return 0;
 147 }
 148
 149 /*
 150  *      Check password.
 151  *
 152  *      Returns:        0  OK
 153  *                      -1 Password fail
 154  *                      -2 Rejected (Auth-Type = Reject, send Port-Message back)
 155  *                      1  End check & return, don't reply
 156  *
 157  *      NOTE: NOT the same as the RLM_ values !
 158  */
 159 static int rad_check_password(REQUEST *request)
 160 {
 161         VALUE_PAIR *auth_type_pair;
 162         VALUE_PAIR *cur_config_item;
 163         VALUE_PAIR *password_pair;
 164         VALUE_PAIR *auth_item;
 165         uint8_t my_chap[MAX_STRING_LEN];
 166         int auth_type = -1;
 167         int result;
 168         int auth_type_count = 0;
 169         result = 0;
 170
 171         /*
 172          *      Look for matching check items. We skip the whole lot
 173          *      if the authentication type is PW_AUTHTYPE_ACCEPT or
 174          *      PW_AUTHTYPE_REJECT.
 175          */
 176         cur_config_item = request->config_items;
 177         while(((auth_type_pair = pairfind(cur_config_item, PW_AUTH_TYPE, 0))) != NULL) {
 178                 auth_type = auth_type_pair->vp_integer;
 179                 auth_type_count++;
 180                 DICT_VALUE *dv = dict_valbyattr(auth_type_pair->attribute,
 181                                                 auth_type_pair->vp_integer, 0);
 182
 183                 RDEBUG2("Found Auth-Type = %s",
 184                         (dv != NULL) ? dv->name : "?");
 185                 cur_config_item = auth_type_pair->next;
 186
 187                 if (auth_type == PW_AUTHTYPE_REJECT) {
 188                         RDEBUG2("Auth-Type = Reject, rejecting user");
 189                         return -2;
 190                 }
 191         }
 192
 193         if (( auth_type_count > 1) && (debug_flag)) {
 194                 radlog_request(L_ERR, 0, request, "Warning:  Found %d auth-types on request for user '%s'",
 195                         auth_type_count, request->username->vp_strvalue);
 196         }
 197
 198         /*
 199          *      This means we have a proxy reply or an accept
 200          *  and it wasn't rejected in the above loop.  So
 201          *  that means it is accepted and we do no further
 202          *  authentication
 203          */
 204         if ((auth_type == PW_AUTHTYPE_ACCEPT)
 205 #ifdef WITH_PROXY
 206             || (request->proxy)
 207 #endif
 208             ) {
 209                 RDEBUG2("Auth-Type = Accept, accepting the user");
 210                 return 0;
 211         }
 212
 213         password_pair =  pairfind(request->config_items, PW_USER_PASSWORD, 0);
 214         if (password_pair &&
 215             pairfind(request->config_items, PW_CLEARTEXT_PASSWORD, 0)) {
 216           pairdelete(&request->config_items, PW_USER_PASSWORD, 0);
 217                 password_pair = NULL;
 218         }
 219
 220         if (password_pair) {
 221                 DICT_ATTR *da;
 222
 223                 RDEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 224                 RDEBUG("!!!    Replacing User-Password in config items with Cleartext-Password.     !!!");
 225                 RDEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 226                 RDEBUG("!!! Please update your configuration so that the \"known good\"               !!!");
 227                 RDEBUG("!!! clear text password is in Cleartext-Password, and not in User-Password. !!!");
 228                 RDEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 229                 password_pair->attribute = PW_CLEARTEXT_PASSWORD;
 230                 da = dict_attrbyvalue(PW_CLEARTEXT_PASSWORD, 0);
 231                 if (!da) {
 232                         radlog_request(L_ERR, 0, request, "FATAL: You broke the dictionaries.  Please use the default dictionaries!");
 233                         _exit(1);
 234                 }
 235
 236                 password_pair->name = da->name;
 237         }
 238
 239         /*
 240          *      Find the "known good" password.
 241          *
 242          *      FIXME: We should get rid of these hacks, and replace
 243          *      them with a module.
 244          */
 245         if ((password_pair = pairfind(request->config_items, PW_CRYPT_PASSWORD, 0)) != NULL) {
 246                 /*
 247                  *      Re-write Auth-Type, but ONLY if it isn't already
 248                  *      set.
 249                  */
 250                 if (auth_type == -1) auth_type = PW_AUTHTYPE_CRYPT;
 251         } else {
 252                 password_pair = pairfind(request->config_items, PW_CLEARTEXT_PASSWORD, 0);
 253         }
 254
 255         if (auth_type < 0) {
 256                 if (password_pair) {
 257                         auth_type = PW_AUTHTYPE_LOCAL;
 258                 } else {
 259                         /*
 260                         *       The admin hasn't told us how to
 261                         *       authenticate the user, so we reject them!
 262                         *
 263                         *       This is fail-safe.
 264                         */
 265                         RDEBUG2("ERROR: No authenticate method (Auth-Type) found for the request: Rejecting the user");
 266                         return -2;
 267                 }
 268         }
 269
 270         switch(auth_type) {
 271                 case PW_AUTHTYPE_CRYPT:
 272                         RDEBUG2("WARNING: Please update your configuration, and remove 'Auth-Type = Crypt'");
 273                         RDEBUG2("WARNING: Use the PAP module instead.");
 274
 275                         /*
 276                          *      Find the password sent by the user. It
 277                          *      SHOULD be there, if it's not
 278                          *      authentication fails.
 279                          */
 280                         auth_item = request->password;
 281                         if (auth_item == NULL) {
 282                                 RDEBUG2("No User-Password or CHAP-Password attribute in the request");
 283                                 return -1;
 284                         }
 285
 286                         if (password_pair == NULL) {
 287                                 RDEBUG2("No Crypt-Password configured for the user");
 288                                 rad_authlog("Login incorrect "
 289                                         "(No Crypt-Password configured for the user)", request, 0);
 290                                 return -1;
 291                         }
 292
 293                         switch (fr_crypt_check((char *)auth_item->vp_strvalue,
 294                                                                          (char *)password_pair->vp_strvalue)) {
 295                         case -1:
 296                           rad_authlog("Login incorrect "
 297                                                   "(system failed to supply an encrypted password for comparison)", request, 0);
 298                         case 1:
 299                           return -1;
 300                         }
 301                         break;
 302                 case PW_AUTHTYPE_LOCAL:
 303                         RDEBUG2("WARNING: Please update your configuration, and remove 'Auth-Type = Local'");
 304                         RDEBUG2("WARNING: Use the PAP or CHAP modules instead.");
 305
 306                         /*
 307                          *      Find the password sent by the user. It
 308                          *      SHOULD be there, if it's not
 309                          *      authentication fails.
 310                          */
 311                         auth_item = request->password;
 312                         if (!auth_item)
 313                                 auth_item = pairfind(request->packet->vps,
 314                                                      PW_CHAP_PASSWORD, 0);
 315                         if (!auth_item) {
 316                                 RDEBUG2("No User-Password or CHAP-Password attribute in the request.");
 317                                 RDEBUG2("Cannot perform authentication.");
 318                                 return -1;
 319                         }
 320
 321                         /*
 322                          *      Plain text password.
 323                          */
 324                         if (password_pair == NULL) {
 325                                 RDEBUG2("No \"known good\" password was configured for the user.");
 326                                 RDEBUG2("As a result, we cannot authenticate the user.");
 327                                 rad_authlog("Login incorrect "
 328                                         "(No password configured for the user)", request, 0);
 329                                 return -1;
 330                         }
 331
 332                         /*
 333                          *      Local password is just plain text.
 334                          */
 335                         if (auth_item->attribute == PW_USER_PASSWORD) {
 336                                 if (strcmp((char *)password_pair->vp_strvalue,
 337                                            (char *)auth_item->vp_strvalue) != 0) {
 338                                         RDEBUG2("User-Password in the request does NOT match \"known good\" password.");
 339                                         return -1;
 340                                 }
 341                                 RDEBUG2("User-Password in the request is correct.");
 342                                 break;
 343
 344                         } else if (auth_item->attribute != PW_CHAP_PASSWORD) {
 345                                 RDEBUG2("The user did not supply a User-Password or a CHAP-Password attribute");
 346                                 rad_authlog("Login incorrect "
 347                                         "(no User-Password or CHAP-Password attribute)", request, 0);
 348                                 return -1;
 349                         }
 350
 351                         rad_chap_encode(request->packet, my_chap,
 352                                         auth_item->vp_octets[0], password_pair);
 353
 354                         /*
 355                          *      Compare them
 356                          */
 357                         if (memcmp(my_chap + 1, auth_item->vp_strvalue + 1,
 358                                    CHAP_VALUE_LENGTH) != 0) {
 359                                 RDEBUG2("CHAP-Password is incorrect.");
 360                                 return -1;
 361                         }
 362                         RDEBUG2("CHAP-Password is correct.");
 363                         break;
 364                 default:
 365                         /*
 366                          *      See if there is a module that handles
 367                          *      this type, and turn the RLM_ return
 368                          *      status into the values as defined at
 369                          *      the top of this function.
 370                          */
 371                         result = module_authenticate(auth_type, request);
 372                         switch (result) {
 373                                 /*
 374                                  *      An authentication module FAIL
 375                                  *      return code, or any return code that
 376                                  *      is not expected from authentication,
 377                                  *      is the same as an explicit REJECT!
 378                                  */
 379                                 case RLM_MODULE_FAIL:
 380                                 case RLM_MODULE_INVALID:
 381                                 case RLM_MODULE_NOOP:
 382                                 case RLM_MODULE_NOTFOUND:
 383                                 case RLM_MODULE_REJECT:
 384                                 case RLM_MODULE_UPDATED:
 385                                 case RLM_MODULE_USERLOCK:
 386                                 default:
 387                                         result = -1;
 388                                         break;
 389                                 case RLM_MODULE_OK:
 390                                         result = 0;
 391                                         break;
 392                                 case RLM_MODULE_HANDLED:
 393                                         result = 1;
 394                                         break;
 395                         }
 396                         break;
 397         }
 398
 399         return result;
 400 }
 401
 402 /*
 403  *      Post-authentication step processes the response before it is
 404  *      sent to the NAS. It can receive both Access-Accept and Access-Reject
 405  *      replies.
 406  */
 407 int rad_postauth(REQUEST *request)
 408 {
 409         int     result;
 410         int     postauth_type = 0;
 411         VALUE_PAIR *vp;
 412
 413         /*
 414          *      Do post-authentication calls. ignoring the return code.
 415          */
 416         vp = pairfind(request->config_items, PW_POST_AUTH_TYPE, 0);
 417         if (vp) {
 418                 RDEBUG2("Using Post-Auth-Type %s", vp->vp_strvalue);
 419                 postauth_type = vp->vp_integer;
 420         }
 421         result = module_post_auth(postauth_type, request);
 422         switch (result) {
 423                 /*
 424                  *      The module failed, or said to reject the user: Do so.
 425                  */
 426                 case RLM_MODULE_FAIL:
 427                 case RLM_MODULE_INVALID:
 428                 case RLM_MODULE_REJECT:
 429                 case RLM_MODULE_USERLOCK:
 430                 default:
 431                         request->reply->code = PW_AUTHENTICATION_REJECT;
 432                         result = RLM_MODULE_REJECT;
 433                         break;
 434                 /*
 435                  *      The module handled the request, cancel the reply.
 436                  */
 437                 case RLM_MODULE_HANDLED:
 438                         /* FIXME */
 439                         break;
 440                 /*
 441                  *      The module had a number of OK return codes.
 442                  */
 443                 case RLM_MODULE_NOOP:
 444                 case RLM_MODULE_NOTFOUND:
 445                 case RLM_MODULE_OK:
 446                 case RLM_MODULE_UPDATED:
 447                         result = RLM_MODULE_OK;
 448                         break;
 449         }
 450         return result;
 451 }
 452
 453 /*
 454  *      Process and reply to an authentication request
 455  *
 456  *      The return value of this function isn't actually used right now, so
 457  *      it's not entirely clear if it is returning the right things. --Pac.
 458  */
 459 int rad_authenticate(REQUEST *request)
 460 {
 461         VALUE_PAIR      *namepair;
 462 #ifdef WITH_SESSION_MGMT
 463         VALUE_PAIR      *check_item;
 464 #endif
 465         VALUE_PAIR      *auth_item = NULL;
 466         VALUE_PAIR      *module_msg;
 467         VALUE_PAIR      *tmp = NULL;
 468         int             result;
 469         const char      *password;
 470         char            autz_retry = 0;
 471         int             autz_type = 0;
 472
 473         password = "";
 474
 475 #ifdef WITH_PROXY
 476         /*
 477          *      If this request got proxied to another server, we need
 478          *      to check whether it authenticated the request or not.
 479          */
 480         if (request->proxy_reply) {
 481                 switch (request->proxy_reply->code) {
 482                 /*
 483                  *      Reply of ACCEPT means accept, thus set Auth-Type
 484                  *      accordingly.
 485                  */
 486                 case PW_AUTHENTICATION_ACK:
 487                         tmp = radius_paircreate(request,
 488                                                 &request->config_items,
 489                                                 PW_AUTH_TYPE, 0, PW_TYPE_INTEGER);
 490                         if (tmp) tmp->vp_integer = PW_AUTHTYPE_ACCEPT;
 491                         goto authenticate;
 492
 493                 /*
 494                  *      Challenges are punted back to the NAS without any
 495                  *      further processing.
 496                  */
 497                 case PW_ACCESS_CHALLENGE:
 498                         request->reply->code = PW_ACCESS_CHALLENGE;
 499                         return RLM_MODULE_OK;
 500                 /*
 501                  *      ALL other replies mean reject. (this is fail-safe)
 502                  *
 503                  *      Do NOT do any authorization or authentication. They
 504                  *      are being rejected, so we minimize the amount of work
 505                  *      done by the server, by rejecting them here.
 506                  */
 507                 case PW_AUTHENTICATION_REJECT:
 508                         rad_authlog("Login incorrect (Home Server says so)",
 509                                     request, 0);
 510                         request->reply->code = PW_AUTHENTICATION_REJECT;
 511                         return RLM_MODULE_REJECT;
 512
 513                 default:
 514                         rad_authlog("Login incorrect (Home Server failed to respond)",
 515                                     request, 0);
 516                         return RLM_MODULE_REJECT;
 517                 }
 518         }
 519 #endif
 520
 521         /*
 522          *      Get the username from the request.
 523          *
 524          *      Note that namepair MAY be NULL, in which case there
 525          *      is no User-Name attribute in the request.
 526          */
 527         namepair = request->username;
 528
 529         /*
 530          *      Look for, and cache, passwords.
 531          */
 532         if (!request->password) {
 533                 request->password = pairfind(request->packet->vps,
 534                                              PW_USER_PASSWORD, 0);
 535         }
 536
 537         /*
 538          *      Discover which password we want to use.
 539          */
 540         auth_item = request->password;
 541         if (auth_item) {
 542                 password = (const char *)auth_item->vp_strvalue;
 543
 544         } else {
 545                 /*
 546                  *      Maybe there's a CHAP-Password?
 547                  */
 548                 if ((auth_item = pairfind(request->packet->vps,
 549                                           PW_CHAP_PASSWORD, 0)) != NULL) {
 550                         password = "<CHAP-PASSWORD>";
 551
 552                 } else {
 553                         /*
 554                          *      No password we recognize.
 555                          */
 556                         password = "<NO-PASSWORD>";
 557                 }
 558         }
 559         request->password = auth_item;
 560
 561         /*
 562          *      Get the user's authorization information from the database
 563          */
 564 autz_redo:
 565         result = module_authorize(autz_type, request);
 566         switch (result) {
 567                 case RLM_MODULE_NOOP:
 568                 case RLM_MODULE_NOTFOUND:
 569                 case RLM_MODULE_OK:
 570                 case RLM_MODULE_UPDATED:
 571                         break;
 572                 case RLM_MODULE_HANDLED:
 573                         return result;
 574                 case RLM_MODULE_FAIL:
 575                 case RLM_MODULE_INVALID:
 576                 case RLM_MODULE_REJECT:
 577                 case RLM_MODULE_USERLOCK:
 578                 default:
 579                         if ((module_msg = pairfind(request->packet->vps,
 580                                                    PW_MODULE_FAILURE_MESSAGE, 0)) != NULL) {
 581                                 char msg[MAX_STRING_LEN + 16];
 582                                 snprintf(msg, sizeof(msg), "Invalid user (%s)",
 583                                          module_msg->vp_strvalue);
 584                                 rad_authlog(msg,request,0);
 585                         } else {
 586                                 rad_authlog("Invalid user", request, 0);
 587                         }
 588                         request->reply->code = PW_AUTHENTICATION_REJECT;
 589                         return result;
 590         }
 591         if (!autz_retry) {
 592                 tmp = pairfind(request->config_items, PW_AUTZ_TYPE, 0);
 593                 if (tmp) {
 594                         RDEBUG2("Using Autz-Type %s", tmp->vp_strvalue);
 595                         autz_type = tmp->vp_integer;
 596                         autz_retry = 1;
 597                         goto autz_redo;
 598                 }
 599         }
 600
 601         /*
 602          *      If we haven't already proxied the packet, then check
 603          *      to see if we should.  Maybe one of the authorize
 604          *      modules has decided that a proxy should be used. If
 605          *      so, get out of here and send the packet.
 606          */
 607         if (
 608 #ifdef WITH_PROXY
 609             (request->proxy == NULL) &&
 610 #endif
 611             ((tmp = pairfind(request->config_items, PW_PROXY_TO_REALM, 0)) != NULL)) {
 612                 REALM *realm;
 613
 614                 realm = realm_find2(tmp->vp_strvalue);
 615
 616                 /*
 617                  *      Don't authenticate, as the request is going to
 618                  *      be proxied.
 619                  */
 620                 if (realm && realm->auth_pool) {
 621                         return RLM_MODULE_OK;
 622                 }
 623
 624                 /*
 625                  *      Catch users who set Proxy-To-Realm to a LOCAL
 626                  *      realm (sigh).  But don't complain if it is
 627                  *      *the* LOCAL realm.
 628                  */
 629                 if (realm &&(strcmp(realm->name, "LOCAL") != 0)) {
 630                         RDEBUG2("WARNING: You set Proxy-To-Realm = %s, but it is a LOCAL realm!  Cancelling proxy request.", realm->name);
 631                 }
 632
 633                 if (!realm) {
 634                         RDEBUG2("WARNING: You set Proxy-To-Realm = %s, but the realm does not exist!  Cancelling invalid proxy request.", tmp->vp_strvalue);
 635                 }
 636         }
 637
 638 #ifdef WITH_PROXY
 639  authenticate:
 640 #endif
 641
 642         /*
 643          *      Perhaps there is a Stripped-User-Name now.
 644          */
 645         namepair = request->username;
 646
 647         /*
 648          *      Validate the user
 649          */
 650         do {
 651                 result = rad_check_password(request);
 652                 if (result > 0) {
 653                         /* don't reply! */
 654                         return RLM_MODULE_HANDLED;
 655                 }
 656         } while(0);
 657
 658         /*
 659          *      Failed to validate the user.
 660          *
 661          *      We PRESUME that the code which failed will clean up
 662          *      request->reply->vps, to be ONLY the reply items it
 663          *      wants to send back.
 664          */
 665         if (result < 0) {
 666                 RDEBUG2("Failed to authenticate the user.");
 667                 request->reply->code = PW_AUTHENTICATION_REJECT;
 668
 669                 if ((module_msg = pairfind(request->packet->vps,PW_MODULE_FAILURE_MESSAGE, 0)) != NULL){
 670                         char msg[MAX_STRING_LEN+19];
 671
 672                         snprintf(msg, sizeof(msg), "Login incorrect (%s)",
 673                                  module_msg->vp_strvalue);
 674                         rad_authlog(msg, request, 0);
 675                 } else {
 676                         rad_authlog("Login incorrect", request, 0);
 677                 }
 678
 679                 /* double check: maybe the secret is wrong? */
 680                 if ((debug_flag > 1) && (auth_item != NULL) &&
 681                                 (auth_item->attribute == PW_USER_PASSWORD)) {
 682                         char *p;
 683
 684                         p = auth_item->vp_strvalue;
 685                         while (*p != '\0') {
 686                                 if (!isprint((int) *p)) {
 687                                         log_debug("  WARNING: Unprintable characters in the password.\n\t  Double-check the shared secret on the server and the NAS!");
 688                                         break;
 689                                 }
 690                                 p++;
 691                         }
 692                 }
 693         }
 694
 695 #ifdef WITH_SESSION_MGMT
 696         if (result >= 0 &&
 697             (check_item = pairfind(request->config_items, PW_SIMULTANEOUS_USE, 0)) != NULL) {
 698                 int r, session_type = 0;
 699                 char            logstr[1024];
 700                 char            umsg[MAX_STRING_LEN + 1];
 701                 const char      *user_msg = NULL;
 702
 703                 tmp = pairfind(request->config_items, PW_SESSION_TYPE, 0);
 704                 if (tmp) {
 705                         RDEBUG2("Using Session-Type %s", tmp->vp_strvalue);
 706                         session_type = tmp->vp_integer;
 707                 }
 708
 709                 /*
 710                  *      User authenticated O.K. Now we have to check
 711                  *      for the Simultaneous-Use parameter.
 712                  */
 713                 if (namepair &&
 714                     (r = module_checksimul(session_type, request, check_item->vp_integer)) != 0) {
 715                         char mpp_ok = 0;
 716
 717                         if (r == 2){
 718                                 /* Multilink attempt. Check if port-limit > simultaneous-use */
 719                                 VALUE_PAIR *port_limit;
 720
 721                                 if ((port_limit = pairfind(request->reply->vps, PW_PORT_LIMIT, 0)) != NULL &&
 722                                         port_limit->vp_integer > check_item->vp_integer){
 723                                         RDEBUG2("MPP is OK");
 724                                         mpp_ok = 1;
 725                                 }
 726                         }
 727                         if (!mpp_ok){
 728                                 if (check_item->vp_integer > 1) {
 729                                 snprintf(umsg, sizeof(umsg),
 730                                                         "\r\nYou are already logged in %d times  - access denied\r\n\n",
 731                                                         (int)check_item->vp_integer);
 732                                         user_msg = umsg;
 733                                 } else {
 734                                         user_msg = "\r\nYou are already logged in - access denied\r\n\n";
 735                                 }
 736
 737                                 request->reply->code = PW_AUTHENTICATION_REJECT;
 738
 739                                 /*
 740                                  *      They're trying to log in too many times.
 741                                  *      Remove ALL reply attributes.
 742                                  */
 743                                 pairfree(&request->reply->vps);
 744                                 radius_pairmake(request, &request->reply->vps,
 745                                                 "Reply-Message",
 746                                                 user_msg, T_OP_SET);
 747
 748                                 snprintf(logstr, sizeof(logstr), "Multiple logins (max %d) %s",
 749                                         check_item->vp_integer,
 750                                         r == 2 ? "[MPP attempt]" : "");
 751                                 rad_authlog(logstr, request, 1);
 752
 753                                 result = -1;
 754                         }
 755                 }
 756         }
 757 #endif
 758
 759         /*
 760          *      Result should be >= 0 here - if not, it means the user
 761          *      is rejected, so we just process post-auth and return.
 762          */
 763         if (result < 0) {
 764                 return RLM_MODULE_REJECT;
 765         }
 766
 767         /*
 768          *      Add the port number to the Framed-IP-Address if
 769          *      vp->addport is set.
 770          */
 771         if (((tmp = pairfind(request->reply->vps,
 772                              PW_FRAMED_IP_ADDRESS, 0)) != NULL) &&
 773             (tmp->flags.addport != 0)) {
 774                 VALUE_PAIR *vpPortId;
 775
 776                 /*
 777                  *  Find the NAS port ID.
 778                  */
 779                 if ((vpPortId = pairfind(request->packet->vps,
 780                                          PW_NAS_PORT, 0)) != NULL) {
 781                   unsigned long tvalue = ntohl(tmp->vp_integer);
 782                   tmp->vp_integer = htonl(tvalue + vpPortId->vp_integer);
 783                   tmp->flags.addport = 0;
 784                   ip_ntoa(tmp->vp_strvalue, tmp->vp_integer);
 785                 } else {
 786                         RDEBUG2("WARNING: No NAS-Port attribute in request.  CANNOT return a Framed-IP-Address + NAS-Port.\n");
 787                         pairdelete(&request->reply->vps, PW_FRAMED_IP_ADDRESS, 0);
 788                 }
 789         }
 790
 791         /*
 792          *      Set the reply to Access-Accept, if it hasn't already
 793          *      been set to something.  (i.e. Access-Challenge)
 794          */
 795         if (request->reply->code == 0)
 796           request->reply->code = PW_AUTHENTICATION_ACK;
 797
 798         if ((module_msg = pairfind(request->packet->vps,PW_MODULE_SUCCESS_MESSAGE, 0)) != NULL){
 799                 char msg[MAX_STRING_LEN+12];
 800
 801                 snprintf(msg, sizeof(msg), "Login OK (%s)",
 802                          module_msg->vp_strvalue);
 803                 rad_authlog(msg, request, 1);
 804         } else {
 805                 rad_authlog("Login OK", request, 1);
 806         }
 807
 808         /*
 809          *      Run the modules in the 'post-auth' section.
 810          */
 811         result = rad_postauth(request);
 812
 813         return result;
 814 }