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)
 192 #ifdef WITH_PROXY
 193             || (request->proxy)
 194 #endif
 195             ) {
 196                 DEBUG2("  rad_check_password: Auth-Type = Accept, accepting the user");
 197                 return 0;
 198         }
 199
 200         password_pair =  pairfind(request->config_items, PW_USER_PASSWORD);
 201         if (password_pair &&
 202             pairfind(request->config_items, PW_CLEARTEXT_PASSWORD)) {
 203                 pairdelete(&request->config_items, PW_USER_PASSWORD);
 204                 password_pair = NULL;
 205         }
 206
 207         if (password_pair) {
 208                 DICT_ATTR *da;
 209
 210                 DEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 211                 DEBUG("!!!    Replacing User-Password in config items with Cleartext-Password.     !!!");
 212                 DEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 213                 DEBUG("!!! Please update your configuration so that the \"known good\"               !!!");
 214                 DEBUG("!!! clear text password is in Cleartext-Password, and not in User-Password. !!!");
 215                 DEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 216                 password_pair->attribute = PW_CLEARTEXT_PASSWORD;
 217                 da = dict_attrbyvalue(PW_CLEARTEXT_PASSWORD);
 218                 if (!da) {
 219                         radlog(L_ERR, "FATAL: You broke the dictionaries.  Please use the default dictionaries!");
 220                         _exit(1);
 221                 }
 222
 223                 password_pair->name = da->name;
 224         }
 225
 226         /*
 227          *      Find the "known good" password.
 228          *
 229          *      FIXME: We should get rid of these hacks, and replace
 230          *      them with a module.
 231          */
 232         if ((password_pair = pairfind(request->config_items, PW_CRYPT_PASSWORD)) != NULL) {
 233                 /*
 234                  *      Re-write Auth-Type, but ONLY if it isn't already
 235                  *      set.
 236                  */
 237                 if (auth_type == -1) auth_type = PW_AUTHTYPE_CRYPT;
 238         } else {
 239                 password_pair = pairfind(request->config_items, PW_CLEARTEXT_PASSWORD);
 240         }
 241
 242         if (auth_type < 0) {
 243                 if (password_pair) {
 244                         auth_type = PW_AUTHTYPE_LOCAL;
 245                 } else {
 246                         /*
 247                         *       The admin hasn't told us how to
 248                         *       authenticate the user, so we reject them!
 249                         *
 250                         *       This is fail-safe.
 251                         */
 252                         DEBUG2("auth: No authenticate method (Auth-Type) configuration found for the request: Rejecting the user");
 253                         return -2;
 254                 }
 255         }
 256
 257         switch(auth_type) {
 258                 DICT_VALUE *dval;
 259
 260                 case PW_AUTHTYPE_CRYPT:
 261                         /*
 262                          *      Find the password sent by the user. It
 263                          *      SHOULD be there, if it's not
 264                          *      authentication fails.
 265                          */
 266                         auth_item = request->password;
 267                         if (auth_item == NULL) {
 268                                 DEBUG2("auth: No User-Password or CHAP-Password attribute in the request");
 269                                 return -1;
 270                         }
 271
 272                         DEBUG2("auth: type Crypt");
 273                         if (password_pair == NULL) {
 274                                 DEBUG2("No Crypt-Password configured for the user");
 275                                 rad_authlog("Login incorrect "
 276                                         "(No Crypt-Password configured for the user)", request, 0);
 277                                 return -1;
 278                         }
 279
 280                         switch (fr_crypt_check((char *)auth_item->vp_strvalue,
 281                                                                          (char *)password_pair->vp_strvalue)) {
 282                         case -1:
 283                           rad_authlog("Login incorrect "
 284                                                   "(system failed to supply an encrypted password for comparison)", request, 0);
 285                         case 1:
 286                           return -1;
 287                         }
 288                         break;
 289                 case PW_AUTHTYPE_LOCAL:
 290                         DEBUG2("auth: type Local");
 291
 292                         /*
 293                          *      Find the password sent by the user. It
 294                          *      SHOULD be there, if it's not
 295                          *      authentication fails.
 296                          */
 297                         auth_item = request->password;
 298                         if (!auth_item)
 299                                 auth_item = pairfind(request->packet->vps,
 300                                                      PW_CHAP_PASSWORD);
 301                         if (!auth_item) {
 302                                 DEBUG2("auth: No User-Password or CHAP-Password attribute in the request");
 303                                 return -1;
 304                         }
 305
 306                         /*
 307                          *      Plain text password.
 308                          */
 309                         if (password_pair == NULL) {
 310                                 DEBUG2("auth: No password configured for the user");
 311                                 rad_authlog("Login incorrect "
 312                                         "(No password configured for the user)", request, 0);
 313                                 return -1;
 314                         }
 315
 316                         /*
 317                          *      Local password is just plain text.
 318                          */
 319                         if (auth_item->attribute == PW_USER_PASSWORD) {
 320                                 if (strcmp((char *)password_pair->vp_strvalue,
 321                                            (char *)auth_item->vp_strvalue) != 0) {
 322                                         DEBUG2("auth: user supplied User-Password does NOT match local User-Password");
 323                                         return -1;
 324                                 }
 325                                 DEBUG2("auth: user supplied User-Password matches local User-Password");
 326                                 break;
 327
 328                         } else if (auth_item->attribute != PW_CHAP_PASSWORD) {
 329                                 DEBUG2("The user did not supply a User-Password or a CHAP-Password attribute");
 330                                 rad_authlog("Login incorrect "
 331                                         "(no User-Password or CHAP-Password attribute)", request, 0);
 332                                 return -1;
 333                         }
 334
 335                         rad_chap_encode(request->packet, my_chap,
 336                                         auth_item->vp_octets[0], password_pair);
 337
 338                         /*
 339                          *      Compare them
 340                          */
 341                         if (memcmp(my_chap + 1, auth_item->vp_strvalue + 1,
 342                                    CHAP_VALUE_LENGTH) != 0) {
 343                                 DEBUG2("auth: user supplied CHAP-Password does NOT match local User-Password");
 344                                 return -1;
 345                         }
 346                         DEBUG2("auth: user supplied CHAP-Password matches local User-Password");
 347                         break;
 348                 default:
 349                         dval = dict_valbyattr(PW_AUTH_TYPE, auth_type);
 350                         if (dval) {
 351                                 DEBUG2("auth: type \"%s\"", dval->name);
 352                         } else {
 353                                 DEBUG2("auth: type UNKNOWN-%d", auth_type);
 354                         }
 355
 356                         /*
 357                          *      See if there is a module that handles
 358                          *      this type, and turn the RLM_ return
 359                          *      status into the values as defined at
 360                          *      the top of this function.
 361                          */
 362                         result = module_authenticate(auth_type, request);
 363                         switch (result) {
 364                                 /*
 365                                  *      An authentication module FAIL
 366                                  *      return code, or any return code that
 367                                  *      is not expected from authentication,
 368                                  *      is the same as an explicit REJECT!
 369                                  */
 370                                 case RLM_MODULE_FAIL:
 371                                 case RLM_MODULE_INVALID:
 372                                 case RLM_MODULE_NOOP:
 373                                 case RLM_MODULE_NOTFOUND:
 374                                 case RLM_MODULE_REJECT:
 375                                 case RLM_MODULE_UPDATED:
 376                                 case RLM_MODULE_USERLOCK:
 377                                 default:
 378                                         result = -1;
 379                                         break;
 380                                 case RLM_MODULE_OK:
 381                                         result = 0;
 382                                         break;
 383                                 case RLM_MODULE_HANDLED:
 384                                         result = 1;
 385                                         break;
 386                         }
 387                         break;
 388         }
 389
 390         return result;
 391 }
 392
 393 /*
 394  *      Post-authentication step processes the response before it is
 395  *      sent to the NAS. It can receive both Access-Accept and Access-Reject
 396  *      replies.
 397  */
 398 int rad_postauth(REQUEST *request)
 399 {
 400         int     result;
 401         int     postauth_type = 0;
 402         VALUE_PAIR *vp;
 403
 404         /*
 405          *      Do post-authentication calls. ignoring the return code.
 406          */
 407         vp = pairfind(request->config_items, PW_POST_AUTH_TYPE);
 408         if (vp) {
 409                 DEBUG2("  Found Post-Auth-Type %s", vp->vp_strvalue);
 410                 postauth_type = vp->vp_integer;
 411         }
 412         result = module_post_auth(postauth_type, request);
 413         switch (result) {
 414                 /*
 415                  *      The module failed, or said to reject the user: Do so.
 416                  */
 417                 case RLM_MODULE_FAIL:
 418                 case RLM_MODULE_INVALID:
 419                 case RLM_MODULE_REJECT:
 420                 case RLM_MODULE_USERLOCK:
 421                 default:
 422                         request->reply->code = PW_AUTHENTICATION_REJECT;
 423                         result = RLM_MODULE_REJECT;
 424                         break;
 425                 /*
 426                  *      The module handled the request, cancel the reply.
 427                  */
 428                 case RLM_MODULE_HANDLED:
 429                         /* FIXME */
 430                         break;
 431                 /*
 432                  *      The module had a number of OK return codes.
 433                  */
 434                 case RLM_MODULE_NOOP:
 435                 case RLM_MODULE_NOTFOUND:
 436                 case RLM_MODULE_OK:
 437                 case RLM_MODULE_UPDATED:
 438                         result = RLM_MODULE_OK;
 439                         break;
 440         }
 441         return result;
 442 }
 443
 444 /*
 445  *      Process and reply to an authentication request
 446  *
 447  *      The return value of this function isn't actually used right now, so
 448  *      it's not entirely clear if it is returning the right things. --Pac.
 449  */
 450 int rad_authenticate(REQUEST *request)
 451 {
 452         VALUE_PAIR      *namepair;
 453 #ifdef WITH_SESSION_MGMT
 454         VALUE_PAIR      *check_item;
 455 #endif
 456         VALUE_PAIR      *auth_item = NULL;
 457         VALUE_PAIR      *module_msg;
 458         VALUE_PAIR      *tmp = NULL;
 459         int             result;
 460         const char      *password;
 461         char            autz_retry = 0;
 462         int             autz_type = 0;
 463
 464         password = "";
 465
 466 #ifdef WITH_PROXY
 467         /*
 468          *      If this request got proxied to another server, we need
 469          *      to check whether it authenticated the request or not.
 470          */
 471         if (request->proxy_reply) {
 472                 switch (request->proxy_reply->code) {
 473                 /*
 474                  *      Reply of ACCEPT means accept, thus set Auth-Type
 475                  *      accordingly.
 476                  */
 477                 case PW_AUTHENTICATION_ACK:
 478                         tmp = radius_paircreate(request,
 479                                                 &request->config_items,
 480                                                 PW_AUTH_TYPE, PW_TYPE_INTEGER);
 481                         if (tmp) tmp->vp_integer = PW_AUTHTYPE_ACCEPT;
 482                         goto authenticate;
 483
 484                 /*
 485                  *      Challenges are punted back to the NAS without any
 486                  *      further processing.
 487                  */
 488                 case PW_ACCESS_CHALLENGE:
 489                         request->reply->code = PW_ACCESS_CHALLENGE;
 490                         return RLM_MODULE_OK;
 491                 /*
 492                  *      ALL other replies mean reject. (this is fail-safe)
 493                  *
 494                  *      Do NOT do any authorization or authentication. They
 495                  *      are being rejected, so we minimize the amount of work
 496                  *      done by the server, by rejecting them here.
 497                  */
 498                 case PW_AUTHENTICATION_REJECT:
 499                 default:
 500                         rad_authlog("Login incorrect (Home Server says so)",
 501                                     request, 0);
 502                         request->reply->code = PW_AUTHENTICATION_REJECT;
 503                         return RLM_MODULE_REJECT;
 504                 }
 505         }
 506 #endif
 507
 508         /*
 509          *      Get the username from the request.
 510          *
 511          *      Note that namepair MAY be NULL, in which case there
 512          *      is no User-Name attribute in the request.
 513          */
 514         namepair = request->username;
 515
 516         /*
 517          *      Look for, and cache, passwords.
 518          */
 519         if (!request->password) {
 520                 request->password = pairfind(request->packet->vps,
 521                                              PW_USER_PASSWORD);
 522         }
 523
 524         /*
 525          *      Discover which password we want to use.
 526          */
 527         auth_item = request->password;
 528         if (auth_item) {
 529                 password = (const char *)auth_item->vp_strvalue;
 530
 531         } else {
 532                 /*
 533                  *      Maybe there's a CHAP-Password?
 534                  */
 535                 if ((auth_item = pairfind(request->packet->vps,
 536                                           PW_CHAP_PASSWORD)) != NULL) {
 537                         password = "<CHAP-PASSWORD>";
 538
 539                 } else {
 540                         /*
 541                          *      No password we recognize.
 542                          */
 543                         password = "<NO-PASSWORD>";
 544                 }
 545         }
 546         request->password = auth_item;
 547
 548         /*
 549          *      Get the user's authorization information from the database
 550          */
 551 autz_redo:
 552         result = module_authorize(autz_type, request);
 553         switch (result) {
 554                 case RLM_MODULE_NOOP:
 555                 case RLM_MODULE_NOTFOUND:
 556                 case RLM_MODULE_OK:
 557                 case RLM_MODULE_UPDATED:
 558                         break;
 559                 case RLM_MODULE_HANDLED:
 560                         return result;
 561                 case RLM_MODULE_FAIL:
 562                 case RLM_MODULE_INVALID:
 563                 case RLM_MODULE_REJECT:
 564                 case RLM_MODULE_USERLOCK:
 565                 default:
 566                         if ((module_msg = pairfind(request->packet->vps,
 567                                         PW_MODULE_FAILURE_MESSAGE)) != NULL) {
 568                                 char msg[MAX_STRING_LEN + 16];
 569                                 snprintf(msg, sizeof(msg), "Invalid user (%s)",
 570                                          module_msg->vp_strvalue);
 571                                 rad_authlog(msg,request,0);
 572                         } else {
 573                                 rad_authlog("Invalid user", request, 0);
 574                         }
 575                         request->reply->code = PW_AUTHENTICATION_REJECT;
 576                         return result;
 577         }
 578         if (!autz_retry) {
 579                 tmp = pairfind(request->config_items, PW_AUTZ_TYPE);
 580                 if (tmp) {
 581                         DEBUG2("  Found Autz-Type %s", tmp->vp_strvalue);
 582                         autz_type = tmp->vp_integer;
 583                         autz_retry = 1;
 584                         goto autz_redo;
 585                 }
 586         }
 587
 588         /*
 589          *      If we haven't already proxied the packet, then check
 590          *      to see if we should.  Maybe one of the authorize
 591          *      modules has decided that a proxy should be used. If
 592          *      so, get out of here and send the packet.
 593          */
 594         if (
 595 #ifdef WITH_PROXY
 596             (request->proxy == NULL) &&
 597 #endif
 598             ((tmp = pairfind(request->config_items, PW_PROXY_TO_REALM)) != NULL)) {
 599                 REALM *realm;
 600
 601                 realm = realm_find2(tmp->vp_strvalue);
 602
 603                 /*
 604                  *      Don't authenticate, as the request is going to
 605                  *      be proxied.
 606                  */
 607                 if (realm && realm->auth_pool) {
 608                         return RLM_MODULE_OK;
 609                 }
 610
 611                 /*
 612                  *      Catch users who set Proxy-To-Realm to a LOCAL
 613                  *      realm (sigh).  But don't complain if it is
 614                  *      *the* LOCAL realm.
 615                  */
 616                 if (realm &&(strcmp(realm->name, "LOCAL") != 0)) {
 617                         DEBUG2("  WARNING: You set Proxy-To-Realm = %s, but it is a LOCAL realm!  Cancelling invalid proxy request.", realm->name);
 618                 }
 619
 620                 if (!realm) {
 621                         DEBUG2("  WARNING: You set Proxy-To-Realm = %s, but the realm does not exist!  Cancelling invalid proxy request.", tmp->vp_strvalue);
 622                 }
 623         }
 624
 625 #ifdef WITH_PROXY
 626  authenticate:
 627 #endif
 628
 629         /*
 630          *      Perhaps there is a Stripped-User-Name now.
 631          */
 632         namepair = request->username;
 633
 634         /*
 635          *      Validate the user
 636          */
 637         do {
 638                 result = rad_check_password(request);
 639                 if (result > 0) {
 640                         /* don't reply! */
 641                         return RLM_MODULE_HANDLED;
 642                 }
 643         } while(0);
 644
 645         /*
 646          *      Failed to validate the user.
 647          *
 648          *      We PRESUME that the code which failed will clean up
 649          *      request->reply->vps, to be ONLY the reply items it
 650          *      wants to send back.
 651          */
 652         if (result < 0) {
 653                 DEBUG2("auth: Failed to validate the user.");
 654                 request->reply->code = PW_AUTHENTICATION_REJECT;
 655
 656                 if ((module_msg = pairfind(request->packet->vps,PW_MODULE_FAILURE_MESSAGE)) != NULL){
 657                         char msg[MAX_STRING_LEN+19];
 658
 659                         snprintf(msg, sizeof(msg), "Login incorrect (%s)",
 660                                  module_msg->vp_strvalue);
 661                         rad_authlog(msg, request, 0);
 662                 } else {
 663                         rad_authlog("Login incorrect", request, 0);
 664                 }
 665
 666                 /* double check: maybe the secret is wrong? */
 667                 if ((debug_flag > 1) && (auth_item != NULL) &&
 668                                 (auth_item->attribute == PW_USER_PASSWORD)) {
 669                         char *p;
 670
 671                         p = auth_item->vp_strvalue;
 672                         while (*p != '\0') {
 673                                 if (!isprint((int) *p)) {
 674                                         log_debug("  WARNING: Unprintable characters in the password.\n\t  Double-check the shared secret on the server and the NAS!");
 675                                         break;
 676                                 }
 677                                 p++;
 678                         }
 679                 }
 680         }
 681
 682 #ifdef WITH_SESSION_MGMT
 683         if (result >= 0 &&
 684             (check_item = pairfind(request->config_items, PW_SIMULTANEOUS_USE)) != NULL) {
 685                 int r, session_type = 0;
 686                 char            logstr[1024];
 687                 char            umsg[MAX_STRING_LEN + 1];
 688                 const char      *user_msg = NULL;
 689
 690                 tmp = pairfind(request->config_items, PW_SESSION_TYPE);
 691                 if (tmp) {
 692                         DEBUG2("  Found Session-Type %s", tmp->vp_strvalue);
 693                         session_type = tmp->vp_integer;
 694                 }
 695
 696                 /*
 697                  *      User authenticated O.K. Now we have to check
 698                  *      for the Simultaneous-Use parameter.
 699                  */
 700                 if (namepair &&
 701                     (r = module_checksimul(session_type, request, check_item->vp_integer)) != 0) {
 702                         char mpp_ok = 0;
 703
 704                         if (r == 2){
 705                                 /* Multilink attempt. Check if port-limit > simultaneous-use */
 706                                 VALUE_PAIR *port_limit;
 707
 708                                 if ((port_limit = pairfind(request->reply->vps, PW_PORT_LIMIT)) != NULL &&
 709                                         port_limit->vp_integer > check_item->vp_integer){
 710                                         DEBUG2("main auth: MPP is OK");
 711                                         mpp_ok = 1;
 712                                 }
 713                         }
 714                         if (!mpp_ok){
 715                                 if (check_item->vp_integer > 1) {
 716                                 snprintf(umsg, sizeof(umsg),
 717                                                         "\r\nYou are already logged in %d times  - access denied\r\n\n",
 718                                                         (int)check_item->vp_integer);
 719                                         user_msg = umsg;
 720                                 } else {
 721                                         user_msg = "\r\nYou are already logged in - access denied\r\n\n";
 722                                 }
 723
 724                                 request->reply->code = PW_AUTHENTICATION_REJECT;
 725
 726                                 /*
 727                                  *      They're trying to log in too many times.
 728                                  *      Remove ALL reply attributes.
 729                                  */
 730                                 pairfree(&request->reply->vps);
 731                                 radius_pairmake(request, &request->reply->vps,
 732                                                 "Reply-Message",
 733                                                 user_msg, T_OP_SET);
 734
 735                                 snprintf(logstr, sizeof(logstr), "Multiple logins (max %d) %s",
 736                                         check_item->vp_integer,
 737                                         r == 2 ? "[MPP attempt]" : "");
 738                                 rad_authlog(logstr, request, 1);
 739
 740                                 result = -1;
 741                         }
 742                 }
 743         }
 744 #endif
 745
 746         /*
 747          *      Result should be >= 0 here - if not, it means the user
 748          *      is rejected, so we just process post-auth and return.
 749          */
 750         if (result < 0) {
 751                 return RLM_MODULE_REJECT;
 752         }
 753
 754         /*
 755          *      Add the port number to the Framed-IP-Address if
 756          *      vp->addport is set.
 757          */
 758         if (((tmp = pairfind(request->reply->vps,
 759                              PW_FRAMED_IP_ADDRESS)) != NULL) &&
 760             (tmp->flags.addport != 0)) {
 761                 VALUE_PAIR *vpPortId;
 762
 763                 /*
 764                  *  Find the NAS port ID.
 765                  */
 766                 if ((vpPortId = pairfind(request->packet->vps,
 767                                          PW_NAS_PORT)) != NULL) {
 768                   unsigned long tvalue = ntohl(tmp->vp_integer);
 769                   tmp->vp_integer = htonl(tvalue + vpPortId->vp_integer);
 770                   tmp->flags.addport = 0;
 771                   ip_ntoa(tmp->vp_strvalue, tmp->vp_integer);
 772                 } else {
 773                         DEBUG2("WARNING: No NAS-Port attribute in request.  CANNOT return a Framed-IP-Address + NAS-Port.\n");
 774                         pairdelete(&request->reply->vps, PW_FRAMED_IP_ADDRESS);
 775                 }
 776         }
 777
 778         /*
 779          *      Set the reply to Access-Accept, if it hasn't already
 780          *      been set to something.  (i.e. Access-Challenge)
 781          */
 782         if (request->reply->code == 0)
 783           request->reply->code = PW_AUTHENTICATION_ACK;
 784
 785         if ((module_msg = pairfind(request->packet->vps,PW_MODULE_SUCCESS_MESSAGE)) != NULL){
 786                 char msg[MAX_STRING_LEN+12];
 787
 788                 snprintf(msg, sizeof(msg), "Login OK (%s)",
 789                          module_msg->vp_strvalue);
 790                 rad_authlog(msg, request, 1);
 791         } else {
 792                 rad_authlog("Login OK", request, 1);
 793         }
 794
 795         /*
 796          *      Run the modules in the 'post-auth' section.
 797          */
 798         result = rad_postauth(request);
 799
 800         return result;
 801 }