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                         goto authenticate;
 479
 480                 /*
 481                  *      Challenges are punted back to the NAS without any
 482                  *      further processing.
 483                  */
 484                 case PW_ACCESS_CHALLENGE:
 485                         request->reply->code = PW_ACCESS_CHALLENGE;
 486                         return RLM_MODULE_OK;
 487                 /*
 488                  *      ALL other replies mean reject. (this is fail-safe)
 489                  *
 490                  *      Do NOT do any authorization or authentication. They
 491                  *      are being rejected, so we minimize the amount of work
 492                  *      done by the server, by rejecting them here.
 493                  */
 494                 case PW_AUTHENTICATION_REJECT:
 495                 default:
 496                         rad_authlog("Login incorrect (Home Server says so)",
 497                                     request, 0);
 498                         request->reply->code = PW_AUTHENTICATION_REJECT;
 499                         return RLM_MODULE_REJECT;
 500                 }
 501         }
 502
 503         /*
 504          *      Get the username from the request.
 505          *
 506          *      Note that namepair MAY be NULL, in which case there
 507          *      is no User-Name attribute in the request.
 508          */
 509         namepair = request->username;
 510
 511         /*
 512          *      Look for, and cache, passwords.
 513          */
 514         if (!request->password) {
 515                 request->password = pairfind(request->packet->vps,
 516                                              PW_USER_PASSWORD);
 517         }
 518
 519         /*
 520          *      Discover which password we want to use.
 521          */
 522         auth_item = request->password;
 523         if (auth_item) {
 524                 password = (const char *)auth_item->vp_strvalue;
 525
 526         } else {
 527                 /*
 528                  *      Maybe there's a CHAP-Password?
 529                  */
 530                 if ((auth_item = pairfind(request->packet->vps,
 531                                           PW_CHAP_PASSWORD)) != NULL) {
 532                         password = "<CHAP-PASSWORD>";
 533
 534                 } else {
 535                         /*
 536                          *      No password we recognize.
 537                          */
 538                         password = "<NO-PASSWORD>";
 539                 }
 540         }
 541         request->password = auth_item;
 542
 543         /*
 544          *      Get the user's authorization information from the database
 545          */
 546 autz_redo:
 547         result = module_authorize(autz_type, request);
 548         switch (result) {
 549                 case RLM_MODULE_NOOP:
 550                 case RLM_MODULE_NOTFOUND:
 551                 case RLM_MODULE_OK:
 552                 case RLM_MODULE_UPDATED:
 553                         break;
 554                 case RLM_MODULE_HANDLED:
 555                         return result;
 556                 case RLM_MODULE_FAIL:
 557                 case RLM_MODULE_INVALID:
 558                 case RLM_MODULE_REJECT:
 559                 case RLM_MODULE_USERLOCK:
 560                 default:
 561                         if ((module_msg = pairfind(request->packet->vps,
 562                                         PW_MODULE_FAILURE_MESSAGE)) != NULL) {
 563                                 char msg[MAX_STRING_LEN + 16];
 564                                 snprintf(msg, sizeof(msg), "Invalid user (%s)",
 565                                          module_msg->vp_strvalue);
 566                                 rad_authlog(msg,request,0);
 567                         } else {
 568                                 rad_authlog("Invalid user", request, 0);
 569                         }
 570                         request->reply->code = PW_AUTHENTICATION_REJECT;
 571                         return result;
 572         }
 573         if (!autz_retry) {
 574                 tmp = pairfind(request->config_items, PW_AUTZ_TYPE);
 575                 if (tmp) {
 576                         DEBUG2("  Found Autz-Type %s", tmp->vp_strvalue);
 577                         autz_type = tmp->vp_integer;
 578                         autz_retry = 1;
 579                         goto autz_redo;
 580                 }
 581         }
 582
 583         /*
 584          *      If we haven't already proxied the packet, then check
 585          *      to see if we should.  Maybe one of the authorize
 586          *      modules has decided that a proxy should be used. If
 587          *      so, get out of here and send the packet.
 588          */
 589         if ((request->proxy == NULL) &&
 590             ((tmp = pairfind(request->config_items, PW_PROXY_TO_REALM)) != NULL)) {
 591                 REALM *realm;
 592
 593                 realm = realm_find2(tmp->vp_strvalue);
 594
 595                 /*
 596                  *      Don't authenticate, as the request is going to
 597                  *      be proxied.
 598                  */
 599                 if (realm && realm->auth_pool) {
 600                         return RLM_MODULE_OK;
 601                 }
 602
 603                 /*
 604                  *      Catch users who set Proxy-To-Realm to a LOCAL
 605                  *      realm (sigh).  But don't complain if it is
 606                  *      *the* LOCAL realm.
 607                  */
 608                 if (realm &&(strcmp(realm->name, "LOCAL") != 0)) {
 609                         DEBUG2("  WARNING: You set Proxy-To-Realm = %s, but it is a LOCAL realm!  Cancelling invalid proxy request.", realm->name);
 610                 }
 611
 612                 if (!realm) {
 613                         DEBUG2("  WARNING: You set Proxy-To-Realm = %s, but the realm does not exist!  Cancelling invalid proxy request.", tmp->vp_strvalue);
 614                 }
 615         }
 616
 617  authenticate:
 618         /*
 619          *      Perhaps there is a Stripped-User-Name now.
 620          */
 621         namepair = request->username;
 622
 623         /*
 624          *      Validate the user
 625          */
 626         do {
 627                 result = rad_check_password(request);
 628                 if (result > 0) {
 629                         /* don't reply! */
 630                         return RLM_MODULE_HANDLED;
 631                 }
 632         } while(0);
 633
 634         /*
 635          *      Failed to validate the user.
 636          *
 637          *      We PRESUME that the code which failed will clean up
 638          *      request->reply->vps, to be ONLY the reply items it
 639          *      wants to send back.
 640          */
 641         if (result < 0) {
 642                 DEBUG2("auth: Failed to validate the user.");
 643                 request->reply->code = PW_AUTHENTICATION_REJECT;
 644
 645                 if ((module_msg = pairfind(request->packet->vps,PW_MODULE_FAILURE_MESSAGE)) != NULL){
 646                         char msg[MAX_STRING_LEN+19];
 647
 648                         snprintf(msg, sizeof(msg), "Login incorrect (%s)",
 649                                  module_msg->vp_strvalue);
 650                         rad_authlog(msg, request, 0);
 651                 } else {
 652                         rad_authlog("Login incorrect", request, 0);
 653                 }
 654
 655                 /* double check: maybe the secret is wrong? */
 656                 if ((debug_flag > 1) && (auth_item != NULL) &&
 657                                 (auth_item->attribute == PW_USER_PASSWORD)) {
 658                         char *p;
 659
 660                         p = auth_item->vp_strvalue;
 661                         while (*p != '\0') {
 662                                 if (!isprint((int) *p)) {
 663                                         log_debug("  WARNING: Unprintable characters in the password.\n\t  Double-check the shared secret on the server and the NAS!");
 664                                         break;
 665                                 }
 666                                 p++;
 667                         }
 668                 }
 669         }
 670
 671         if (result >= 0 &&
 672             (check_item = pairfind(request->config_items, PW_SIMULTANEOUS_USE)) != NULL) {
 673                 int r, session_type = 0;
 674
 675                 tmp = pairfind(request->config_items, PW_SESSION_TYPE);
 676                 if (tmp) {
 677                         DEBUG2("  Found Session-Type %s", tmp->vp_strvalue);
 678                         session_type = tmp->vp_integer;
 679                 }
 680
 681                 /*
 682                  *      User authenticated O.K. Now we have to check
 683                  *      for the Simultaneous-Use parameter.
 684                  */
 685                 if (namepair &&
 686                     (r = module_checksimul(session_type, request, check_item->vp_integer)) != 0) {
 687                         char mpp_ok = 0;
 688
 689                         if (r == 2){
 690                                 /* Multilink attempt. Check if port-limit > simultaneous-use */
 691                                 VALUE_PAIR *port_limit;
 692
 693                                 if ((port_limit = pairfind(request->reply->vps, PW_PORT_LIMIT)) != NULL &&
 694                                         port_limit->vp_integer > check_item->vp_integer){
 695                                         DEBUG2("main auth: MPP is OK");
 696                                         mpp_ok = 1;
 697                                 }
 698                         }
 699                         if (!mpp_ok){
 700                                 if (check_item->vp_integer > 1) {
 701                                 snprintf(umsg, sizeof(umsg),
 702                                                         "\r\nYou are already logged in %d times  - access denied\r\n\n",
 703                                                         (int)check_item->vp_integer);
 704                                         user_msg = umsg;
 705                                 } else {
 706                                         user_msg = "\r\nYou are already logged in - access denied\r\n\n";
 707                                 }
 708
 709                                 request->reply->code = PW_AUTHENTICATION_REJECT;
 710
 711                                 /*
 712                                  *      They're trying to log in too many times.
 713                                  *      Remove ALL reply attributes.
 714                                  */
 715                                 pairfree(&request->reply->vps);
 716                                 radius_pairmake(request, &request->reply->vps,
 717                                                 "Reply-Message",
 718                                                 user_msg, T_OP_SET);
 719
 720                                 snprintf(logstr, sizeof(logstr), "Multiple logins (max %d) %s",
 721                                         check_item->vp_integer,
 722                                         r == 2 ? "[MPP attempt]" : "");
 723                                 rad_authlog(logstr, request, 1);
 724
 725                                 result = -1;
 726                         }
 727                 }
 728         }
 729
 730         /*
 731          *      Result should be >= 0 here - if not, it means the user
 732          *      is rejected, so we just process post-auth and return.
 733          */
 734         if (result < 0) {
 735                 return RLM_MODULE_REJECT;
 736         }
 737
 738         /*
 739          *      We might need this later.  The 'password' string
 740          *      is NOT used anywhere below here, except for logging,
 741          *      so it should be safe...
 742          */
 743         if ((auth_item != NULL) && (auth_item->attribute == PW_CHAP_PASSWORD)) {
 744                 password = "CHAP-Password";
 745         }
 746
 747         /*
 748          *      Add the port number to the Framed-IP-Address if
 749          *      vp->addport is set.
 750          */
 751         if (((tmp = pairfind(request->reply->vps,
 752                              PW_FRAMED_IP_ADDRESS)) != NULL) &&
 753             (tmp->flags.addport != 0)) {
 754                 VALUE_PAIR *vpPortId;
 755
 756                 /*
 757                  *  Find the NAS port ID.
 758                  */
 759                 if ((vpPortId = pairfind(request->packet->vps,
 760                                          PW_NAS_PORT)) != NULL) {
 761                   unsigned long tvalue = ntohl(tmp->vp_integer);
 762                   tmp->vp_integer = htonl(tvalue + vpPortId->vp_integer);
 763                   tmp->flags.addport = 0;
 764                   ip_ntoa(tmp->vp_strvalue, tmp->vp_integer);
 765                 } else {
 766                         DEBUG2("WARNING: No NAS-Port attribute in request.  CANNOT return a Framed-IP-Address + NAS-Port.\n");
 767                         pairdelete(&request->reply->vps, PW_FRAMED_IP_ADDRESS);
 768                 }
 769         }
 770
 771         /*
 772          *      Set the reply to Access-Accept, if it hasn't already
 773          *      been set to something.  (i.e. Access-Challenge)
 774          */
 775         if (request->reply->code == 0)
 776           request->reply->code = PW_AUTHENTICATION_ACK;
 777
 778         if ((module_msg = pairfind(request->packet->vps,PW_MODULE_SUCCESS_MESSAGE)) != NULL){
 779                 char msg[MAX_STRING_LEN+12];
 780
 781                 snprintf(msg, sizeof(msg), "Login OK (%s)",
 782                          module_msg->vp_strvalue);
 783                 rad_authlog(msg, request, 1);
 784         } else {
 785                 rad_authlog("Login OK", request, 1);
 786         }
 787
 788         /*
 789          *      Run the modules in the 'post-auth' section.
 790          */
 791         result = rad_postauth(request);
 792
 793         return result;
 794 }