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         const char      *tls = "";
  44
  45         if ((cli = pairfind(request->packet->vps, PW_CALLING_STATION_ID, 0)) == NULL)
  46                 do_cli = 0;
  47         if ((pair = pairfind(request->packet->vps, PW_NAS_PORT, 0)) != NULL)
  48                 port = pair->vp_integer;
  49
  50         if (request->packet->dst_port == 0) {
  51                 if (pairfind(request->packet->vps, PW_FREERADIUS_PROXIED_TO, 0)) {
  52                         tls = " via TLS tunnel";
  53                 } else {
  54                         tls = " via proxy to virtual server";
  55                 }
  56         }
  57
  58         snprintf(buf, buflen, "from client %.128s port %u%s%.128s%s",
  59                         request->client->shortname, port,
  60                  (do_cli ? " cli " : ""), (do_cli ? (char *)cli->vp_strvalue : ""),
  61                  tls);
  62
  63         return buf;
  64 }
  65
  66
  67
  68 /*
  69  * Make sure user/pass are clean
  70  * and then log them
  71  */
  72 static int rad_authlog(const char *msg, REQUEST *request, int goodpass)
  73 {
  74         int logit;
  75         const char *extra_msg = NULL;
  76         char clean_password[1024];
  77         char clean_username[1024];
  78         char buf[1024];
  79         char extra[1024];
  80         VALUE_PAIR *username = NULL;
  81
  82         if (!request->root->log_auth) {
  83                 return 0;
  84         }
  85
  86         /*
  87          * Get the correct username based on the configured value
  88          */
  89         if (log_stripped_names == 0) {
  90                 username = pairfind(request->packet->vps, PW_USER_NAME, 0);
  91         } else {
  92                 username = request->username;
  93         }
  94
  95         /*
  96          *      Clean up the username
  97          */
  98         if (username == NULL) {
  99                 strcpy(clean_username, "<no User-Name attribute>");
 100         } else {
 101                 fr_print_string((char *)username->vp_strvalue,
 102                                 username->length,
 103                                 clean_username, sizeof(clean_username));
 104         }
 105
 106         /*
 107          *      Clean up the password
 108          */
 109         if (request->root->log_auth_badpass || request->root->log_auth_goodpass) {
 110                 if (!request->password) {
 111                         VALUE_PAIR *auth_type;
 112
 113                         auth_type = pairfind(request->config_items,
 114                                              PW_AUTH_TYPE, 0);
 115                         if (auth_type) {
 116                                 snprintf(clean_password, sizeof(clean_password),
 117                                          "<via Auth-Type = %s>",
 118                                          dict_valnamebyattr(PW_AUTH_TYPE, 0,
 119                                                             auth_type->vp_integer));
 120                         } else {
 121                                 strcpy(clean_password, "<no User-Password attribute>");
 122                         }
 123                 } else if (pairfind(request->packet->vps, PW_CHAP_PASSWORD, 0)) {
 124                         strcpy(clean_password, "<CHAP-Password>");
 125                 } else {
 126                         fr_print_string((char *)request->password->vp_strvalue,
 127                                          request->password->length,
 128                                          clean_password, sizeof(clean_password));
 129                 }
 130         }
 131
 132         if (goodpass) {
 133                 logit = request->root->log_auth_goodpass;
 134                 extra_msg = request->root->auth_goodpass_msg;
 135         } else {
 136                 logit = request->root->log_auth_badpass;
 137                 extra_msg = request->root->auth_badpass_msg;
 138         }
 139
 140         if (extra_msg) {
 141                 extra[0] = ' ';
 142                 radius_xlat(extra + 1, sizeof(extra) - 1, extra_msg, request,
 143                             NULL);
 144         } else {
 145                 *extra = '\0';
 146         }
 147
 148         radlog_request(L_AUTH, 0, request, "%s: [%s%s%s] (%s)%s",
 149                        msg,
 150                        clean_username,
 151                        logit ? "/" : "",
 152                        logit ? clean_password : "",
 153                        auth_name(buf, sizeof(buf), request, 1),
 154                        extra);
 155
 156         return 0;
 157 }
 158
 159 /*
 160  *      Check password.
 161  *
 162  *      Returns:        0  OK
 163  *                      -1 Password fail
 164  *                      -2 Rejected (Auth-Type = Reject, send Port-Message back)
 165  *                      1  End check & return, don't reply
 166  *
 167  *      NOTE: NOT the same as the RLM_ values !
 168  */
 169 static int rad_check_password(REQUEST *request)
 170 {
 171         VALUE_PAIR *auth_type_pair;
 172         VALUE_PAIR *cur_config_item;
 173         VALUE_PAIR *password_pair;
 174         VALUE_PAIR *auth_item;
 175         uint8_t my_chap[MAX_STRING_LEN];
 176         int auth_type = -1;
 177         int result;
 178         int auth_type_count = 0;
 179         result = 0;
 180
 181         /*
 182          *      Look for matching check items. We skip the whole lot
 183          *      if the authentication type is PW_AUTHTYPE_ACCEPT or
 184          *      PW_AUTHTYPE_REJECT.
 185          */
 186         cur_config_item = request->config_items;
 187         while(((auth_type_pair = pairfind(cur_config_item, PW_AUTH_TYPE, 0))) != NULL) {
 188                 auth_type = auth_type_pair->vp_integer;
 189                 auth_type_count++;
 190
 191                 RDEBUG2("Found Auth-Type = %s",
 192                         dict_valnamebyattr(PW_AUTH_TYPE, 0, auth_type));
 193                 cur_config_item = auth_type_pair->next;
 194
 195                 if (auth_type == PW_AUTHTYPE_REJECT) {
 196                         RDEBUG2("Auth-Type = Reject, rejecting user");
 197                         return -2;
 198                 }
 199         }
 200
 201         if (( auth_type_count > 1) && (debug_flag)) {
 202                 radlog_request(L_ERR, 0, request, "Warning:  Found %d auth-types on request for user '%s'",
 203                         auth_type_count, request->username->vp_strvalue);
 204         }
 205
 206         /*
 207          *      This means we have a proxy reply or an accept
 208          *  and it wasn't rejected in the above loop.  So
 209          *  that means it is accepted and we do no further
 210          *  authentication
 211          */
 212         if ((auth_type == PW_AUTHTYPE_ACCEPT)
 213 #ifdef WITH_PROXY
 214             || (request->proxy)
 215 #endif
 216             ) {
 217                 RDEBUG2("Auth-Type = Accept, accepting the user");
 218                 return 0;
 219         }
 220
 221         password_pair =  pairfind(request->config_items, PW_USER_PASSWORD, 0);
 222         if (password_pair &&
 223             pairfind(request->config_items, PW_CLEARTEXT_PASSWORD, 0)) {
 224           pairdelete(&request->config_items, PW_USER_PASSWORD, 0);
 225                 password_pair = NULL;
 226         }
 227
 228         if (password_pair) {
 229                 DICT_ATTR *da;
 230
 231                 RDEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 232                 RDEBUG("!!!    Replacing User-Password in config items with Cleartext-Password.     !!!");
 233                 RDEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 234                 RDEBUG("!!! Please update your configuration so that the \"known good\"               !!!");
 235                 RDEBUG("!!! clear text password is in Cleartext-Password, and not in User-Password. !!!");
 236                 RDEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 237                 password_pair->attribute = PW_CLEARTEXT_PASSWORD;
 238                 da = dict_attrbyvalue(PW_CLEARTEXT_PASSWORD, 0);
 239                 if (!da) {
 240                         radlog_request(L_ERR, 0, request, "FATAL: You broke the dictionaries.  Please use the default dictionaries!");
 241                         _exit(1);
 242                 }
 243
 244                 password_pair->name = da->name;
 245         }
 246
 247         /*
 248          *      Find the "known good" password.
 249          *
 250          *      FIXME: We should get rid of these hacks, and replace
 251          *      them with a module.
 252          */
 253         if ((password_pair = pairfind(request->config_items, PW_CRYPT_PASSWORD, 0)) != NULL) {
 254                 /*
 255                  *      Re-write Auth-Type, but ONLY if it isn't already
 256                  *      set.
 257                  */
 258                 if (auth_type == -1) auth_type = PW_AUTHTYPE_CRYPT;
 259         } else {
 260                 password_pair = pairfind(request->config_items, PW_CLEARTEXT_PASSWORD, 0);
 261         }
 262
 263         if (auth_type < 0) {
 264                 if (password_pair) {
 265                         auth_type = PW_AUTHTYPE_LOCAL;
 266                 } else {
 267                         /*
 268                         *       The admin hasn't told us how to
 269                         *       authenticate the user, so we reject them!
 270                         *
 271                         *       This is fail-safe.
 272                         */
 273                         RDEBUG2("ERROR: No authenticate method (Auth-Type) found for the request: Rejecting the user");
 274                         return -2;
 275                 }
 276         }
 277
 278         switch(auth_type) {
 279                 case PW_AUTHTYPE_CRYPT:
 280                         RDEBUG2("WARNING: Please update your configuration, and remove 'Auth-Type = Crypt'");
 281                         RDEBUG2("WARNING: Use the PAP module instead.");
 282
 283                         /*
 284                          *      Find the password sent by the user. It
 285                          *      SHOULD be there, if it's not
 286                          *      authentication fails.
 287                          */
 288                         auth_item = request->password;
 289                         if (auth_item == NULL) {
 290                                 RDEBUG2("No User-Password or CHAP-Password attribute in the request");
 291                                 return -1;
 292                         }
 293
 294                         if (password_pair == NULL) {
 295                                 RDEBUG2("No Crypt-Password configured for the user");
 296                                 rad_authlog("Login incorrect "
 297                                         "(No Crypt-Password configured for the user)", request, 0);
 298                                 return -1;
 299                         }
 300
 301                         switch (fr_crypt_check((char *)auth_item->vp_strvalue,
 302                                                                          (char *)password_pair->vp_strvalue)) {
 303                         case -1:
 304                           rad_authlog("Login incorrect "
 305                                                   "(system failed to supply an encrypted password for comparison)", request, 0);
 306                           /* FALL-THROUGH */
 307                         case 1:
 308                           return -1;
 309                         }
 310                         break;
 311                 case PW_AUTHTYPE_LOCAL:
 312                         RDEBUG2("WARNING: Please update your configuration, and remove 'Auth-Type = Local'");
 313                         RDEBUG2("WARNING: Use the PAP or CHAP modules instead.");
 314
 315                         /*
 316                          *      Find the password sent by the user. It
 317                          *      SHOULD be there, if it's not
 318                          *      authentication fails.
 319                          */
 320                         auth_item = request->password;
 321                         if (!auth_item)
 322                                 auth_item = pairfind(request->packet->vps,
 323                                                      PW_CHAP_PASSWORD, 0);
 324                         if (!auth_item) {
 325                                 RDEBUG2("No User-Password or CHAP-Password attribute in the request.");
 326                                 RDEBUG2("Cannot perform authentication.");
 327                                 return -1;
 328                         }
 329
 330                         /*
 331                          *      Plain text password.
 332                          */
 333                         if (password_pair == NULL) {
 334                                 RDEBUG2("No \"known good\" password was configured for the user.");
 335                                 RDEBUG2("As a result, we cannot authenticate the user.");
 336                                 rad_authlog("Login incorrect "
 337                                         "(No password configured for the user)", request, 0);
 338                                 return -1;
 339                         }
 340
 341                         /*
 342                          *      Local password is just plain text.
 343                          */
 344                         if (auth_item->attribute == PW_USER_PASSWORD) {
 345                                 if (strcmp((char *)password_pair->vp_strvalue,
 346                                            (char *)auth_item->vp_strvalue) != 0) {
 347                                         RDEBUG2("User-Password in the request does NOT match \"known good\" password.");
 348                                         return -1;
 349                                 }
 350                                 RDEBUG2("User-Password in the request is correct.");
 351                                 break;
 352
 353                         } else if (auth_item->attribute != PW_CHAP_PASSWORD) {
 354                                 RDEBUG2("The user did not supply a User-Password or a CHAP-Password attribute");
 355                                 rad_authlog("Login incorrect "
 356                                         "(no User-Password or CHAP-Password attribute)", request, 0);
 357                                 return -1;
 358                         }
 359
 360                         rad_chap_encode(request->packet, my_chap,
 361                                         auth_item->vp_octets[0], password_pair);
 362
 363                         /*
 364                          *      Compare them
 365                          */
 366                         if (memcmp(my_chap + 1, auth_item->vp_strvalue + 1,
 367                                    CHAP_VALUE_LENGTH) != 0) {
 368                                 RDEBUG2("CHAP-Password is incorrect.");
 369                                 return -1;
 370                         }
 371                         RDEBUG2("CHAP-Password is correct.");
 372                         break;
 373                 default:
 374                         /*
 375                          *      See if there is a module that handles
 376                          *      this type, and turn the RLM_ return
 377                          *      status into the values as defined at
 378                          *      the top of this function.
 379                          */
 380                         result = module_authenticate(auth_type, request);
 381                         switch (result) {
 382                                 /*
 383                                  *      An authentication module FAIL
 384                                  *      return code, or any return code that
 385                                  *      is not expected from authentication,
 386                                  *      is the same as an explicit REJECT!
 387                                  */
 388                                 case RLM_MODULE_FAIL:
 389                                 case RLM_MODULE_INVALID:
 390                                 case RLM_MODULE_NOOP:
 391                                 case RLM_MODULE_NOTFOUND:
 392                                 case RLM_MODULE_REJECT:
 393                                 case RLM_MODULE_UPDATED:
 394                                 case RLM_MODULE_USERLOCK:
 395                                 default:
 396                                         result = -1;
 397                                         break;
 398                                 case RLM_MODULE_OK:
 399                                         result = 0;
 400                                         break;
 401                                 case RLM_MODULE_HANDLED:
 402                                         result = 1;
 403                                         break;
 404                         }
 405                         break;
 406         }
 407
 408         return result;
 409 }
 410
 411 /*
 412  *      Post-authentication step processes the response before it is
 413  *      sent to the NAS. It can receive both Access-Accept and Access-Reject
 414  *      replies.
 415  */
 416 int rad_postauth(REQUEST *request)
 417 {
 418         int     result;
 419         int     postauth_type = 0;
 420         VALUE_PAIR *vp;
 421
 422         /*
 423          *      Do post-authentication calls. ignoring the return code.
 424          */
 425         vp = pairfind(request->config_items, PW_POST_AUTH_TYPE, 0);
 426         if (vp) {
 427                 postauth_type = vp->vp_integer;
 428                 RDEBUG2("Using Post-Auth-Type %s",
 429                         dict_valnamebyattr(PW_POST_AUTH_TYPE, 0, postauth_type));
 430         }
 431         result = module_post_auth(postauth_type, request);
 432         switch (result) {
 433                 /*
 434                  *      The module failed, or said to reject the user: Do so.
 435                  */
 436                 case RLM_MODULE_FAIL:
 437                 case RLM_MODULE_INVALID:
 438                 case RLM_MODULE_REJECT:
 439                 case RLM_MODULE_USERLOCK:
 440                 default:
 441                         request->reply->code = PW_AUTHENTICATION_REJECT;
 442                         result = RLM_MODULE_REJECT;
 443                         break;
 444                 /*
 445                  *      The module handled the request, cancel the reply.
 446                  */
 447                 case RLM_MODULE_HANDLED:
 448                         /* FIXME */
 449                         break;
 450                 /*
 451                  *      The module had a number of OK return codes.
 452                  */
 453                 case RLM_MODULE_NOOP:
 454                 case RLM_MODULE_NOTFOUND:
 455                 case RLM_MODULE_OK:
 456                 case RLM_MODULE_UPDATED:
 457                         result = RLM_MODULE_OK;
 458                         break;
 459         }
 460         return result;
 461 }
 462
 463 /*
 464  *      Process and reply to an authentication request
 465  *
 466  *      The return value of this function isn't actually used right now, so
 467  *      it's not entirely clear if it is returning the right things. --Pac.
 468  */
 469 int rad_authenticate(REQUEST *request)
 470 {
 471         VALUE_PAIR      *namepair;
 472 #ifdef WITH_SESSION_MGMT
 473         VALUE_PAIR      *check_item;
 474 #endif
 475         VALUE_PAIR      *auth_item = NULL;
 476         VALUE_PAIR      *module_msg;
 477         VALUE_PAIR      *tmp = NULL;
 478         int             result;
 479         const char      *password;
 480         char            autz_retry = 0;
 481         int             autz_type = 0;
 482
 483         password = "";
 484
 485 #ifdef WITH_PROXY
 486         /*
 487          *      If this request got proxied to another server, we need
 488          *      to check whether it authenticated the request or not.
 489          */
 490         if (request->proxy_reply) {
 491                 switch (request->proxy_reply->code) {
 492                 /*
 493                  *      Reply of ACCEPT means accept, thus set Auth-Type
 494                  *      accordingly.
 495                  */
 496                 case PW_AUTHENTICATION_ACK:
 497                         tmp = radius_paircreate(request,
 498                                                 &request->config_items,
 499                                                 PW_AUTH_TYPE, 0, PW_TYPE_INTEGER);
 500                         if (tmp) tmp->vp_integer = PW_AUTHTYPE_ACCEPT;
 501                         goto authenticate;
 502
 503                 /*
 504                  *      Challenges are punted back to the NAS without any
 505                  *      further processing.
 506                  */
 507                 case PW_ACCESS_CHALLENGE:
 508                         request->reply->code = PW_ACCESS_CHALLENGE;
 509                         return RLM_MODULE_OK;
 510                 /*
 511                  *      ALL other replies mean reject. (this is fail-safe)
 512                  *
 513                  *      Do NOT do any authorization or authentication. They
 514                  *      are being rejected, so we minimize the amount of work
 515                  *      done by the server, by rejecting them here.
 516                  */
 517                 case PW_AUTHENTICATION_REJECT:
 518                         rad_authlog("Login incorrect (Home Server says so)",
 519                                     request, 0);
 520                         request->reply->code = PW_AUTHENTICATION_REJECT;
 521                         return RLM_MODULE_REJECT;
 522
 523                 default:
 524                         rad_authlog("Login incorrect (Home Server failed to respond)",
 525                                     request, 0);
 526                         return RLM_MODULE_REJECT;
 527                 }
 528         }
 529 #endif
 530
 531         /*
 532          *      Get the username from the request.
 533          *
 534          *      Note that namepair MAY be NULL, in which case there
 535          *      is no User-Name attribute in the request.
 536          */
 537         namepair = request->username;
 538
 539         /*
 540          *      Look for, and cache, passwords.
 541          */
 542         if (!request->password) {
 543                 request->password = pairfind(request->packet->vps,
 544                                              PW_USER_PASSWORD, 0);
 545         }
 546
 547         /*
 548          *      Discover which password we want to use.
 549          */
 550         auth_item = request->password;
 551         if (auth_item) {
 552                 password = (const char *)auth_item->vp_strvalue;
 553
 554         } else {
 555                 /*
 556                  *      Maybe there's a CHAP-Password?
 557                  */
 558                 if ((auth_item = pairfind(request->packet->vps,
 559                                           PW_CHAP_PASSWORD, 0)) != NULL) {
 560                         password = "<CHAP-PASSWORD>";
 561
 562                 } else {
 563                         /*
 564                          *      No password we recognize.
 565                          */
 566                         password = "<NO-PASSWORD>";
 567                 }
 568         }
 569         request->password = auth_item;
 570
 571         /*
 572          *      Get the user's authorization information from the database
 573          */
 574 autz_redo:
 575         result = module_authorize(autz_type, request);
 576         switch (result) {
 577                 case RLM_MODULE_NOOP:
 578                 case RLM_MODULE_NOTFOUND:
 579                 case RLM_MODULE_OK:
 580                 case RLM_MODULE_UPDATED:
 581                         break;
 582                 case RLM_MODULE_HANDLED:
 583                         return result;
 584                 case RLM_MODULE_FAIL:
 585                 case RLM_MODULE_INVALID:
 586                 case RLM_MODULE_REJECT:
 587                 case RLM_MODULE_USERLOCK:
 588                 default:
 589                         if ((module_msg = pairfind(request->packet->vps,
 590                                                    PW_MODULE_FAILURE_MESSAGE, 0)) != NULL) {
 591                                 char msg[MAX_STRING_LEN + 16];
 592                                 snprintf(msg, sizeof(msg), "Invalid user (%s)",
 593                                          module_msg->vp_strvalue);
 594                                 rad_authlog(msg,request,0);
 595                         } else {
 596                                 rad_authlog("Invalid user", request, 0);
 597                         }
 598                         request->reply->code = PW_AUTHENTICATION_REJECT;
 599                         return result;
 600         }
 601         if (!autz_retry) {
 602                 tmp = pairfind(request->config_items, PW_AUTZ_TYPE, 0);
 603                 if (tmp) {
 604                         autz_type = tmp->vp_integer;
 605                         RDEBUG2("Using Autz-Type %s",
 606                                 dict_valnamebyattr(PW_AUTZ_TYPE, 0, autz_type));
 607                         autz_retry = 1;
 608                         goto autz_redo;
 609                 }
 610         }
 611
 612         /*
 613          *      If we haven't already proxied the packet, then check
 614          *      to see if we should.  Maybe one of the authorize
 615          *      modules has decided that a proxy should be used. If
 616          *      so, get out of here and send the packet.
 617          */
 618         if (
 619 #ifdef WITH_PROXY
 620             (request->proxy == NULL) &&
 621 #endif
 622             ((tmp = pairfind(request->config_items, PW_PROXY_TO_REALM, 0)) != NULL)) {
 623                 REALM *realm;
 624
 625                 realm = realm_find2(tmp->vp_strvalue);
 626
 627                 /*
 628                  *      Don't authenticate, as the request is going to
 629                  *      be proxied.
 630                  */
 631                 if (realm && realm->auth_pool) {
 632                         return RLM_MODULE_OK;
 633                 }
 634
 635                 /*
 636                  *      Catch users who set Proxy-To-Realm to a LOCAL
 637                  *      realm (sigh).  But don't complain if it is
 638                  *      *the* LOCAL realm.
 639                  */
 640                 if (realm &&(strcmp(realm->name, "LOCAL") != 0)) {
 641                         RDEBUG2("WARNING: You set Proxy-To-Realm = %s, but it is a LOCAL realm!  Cancelling proxy request.", realm->name);
 642                 }
 643
 644                 if (!realm) {
 645                         RDEBUG2("WARNING: You set Proxy-To-Realm = %s, but the realm does not exist!  Cancelling invalid proxy request.", tmp->vp_strvalue);
 646                 }
 647         }
 648
 649 #ifdef WITH_PROXY
 650  authenticate:
 651 #endif
 652
 653         /*
 654          *      Perhaps there is a Stripped-User-Name now.
 655          */
 656         namepair = request->username;
 657
 658         /*
 659          *      Validate the user
 660          */
 661         do {
 662                 result = rad_check_password(request);
 663                 if (result > 0) {
 664                         /* don't reply! */
 665                         return RLM_MODULE_HANDLED;
 666                 }
 667         } while(0);
 668
 669         /*
 670          *      Failed to validate the user.
 671          *
 672          *      We PRESUME that the code which failed will clean up
 673          *      request->reply->vps, to be ONLY the reply items it
 674          *      wants to send back.
 675          */
 676         if (result < 0) {
 677                 RDEBUG2("Failed to authenticate the user.");
 678                 request->reply->code = PW_AUTHENTICATION_REJECT;
 679
 680                 if ((module_msg = pairfind(request->packet->vps,PW_MODULE_FAILURE_MESSAGE, 0)) != NULL){
 681                         char msg[MAX_STRING_LEN+19];
 682
 683                         snprintf(msg, sizeof(msg), "Login incorrect (%s)",
 684                                  module_msg->vp_strvalue);
 685                         rad_authlog(msg, request, 0);
 686                 } else {
 687                         rad_authlog("Login incorrect", request, 0);
 688                 }
 689
 690                 /* double check: maybe the secret is wrong? */
 691                 if ((debug_flag > 1) && (auth_item != NULL) &&
 692                                 (auth_item->attribute == PW_USER_PASSWORD)) {
 693                         uint8_t *p;
 694
 695                         p = (uint8_t *) auth_item->vp_strvalue;
 696                         while (*p) {
 697                                 int size;
 698
 699                                 size = fr_utf8_char(p);
 700                                 if (!size) {
 701                                         log_debug("  WARNING: Unprintable characters in the password.  Double-check the shared secret on the server and the NAS!");
 702                                         break;
 703                                 }
 704                                 p += size;
 705                         }
 706                 }
 707         }
 708
 709 #ifdef WITH_SESSION_MGMT
 710         if (result >= 0 &&
 711             (check_item = pairfind(request->config_items, PW_SIMULTANEOUS_USE, 0)) != NULL) {
 712                 int r, session_type = 0;
 713                 char            logstr[1024];
 714                 char            umsg[MAX_STRING_LEN + 1];
 715                 const char      *user_msg = NULL;
 716
 717                 tmp = pairfind(request->config_items, PW_SESSION_TYPE, 0);
 718                 if (tmp) {
 719                         session_type = tmp->vp_integer;
 720                         RDEBUG2("Using Session-Type %s",
 721                                 dict_valnamebyattr(PW_SESSION_TYPE, 0, session_type));
 722                 }
 723
 724                 /*
 725                  *      User authenticated O.K. Now we have to check
 726                  *      for the Simultaneous-Use parameter.
 727                  */
 728                 if (namepair &&
 729                     (r = module_checksimul(session_type, request, check_item->vp_integer)) != 0) {
 730                         char mpp_ok = 0;
 731
 732                         if (r == 2){
 733                                 /* Multilink attempt. Check if port-limit > simultaneous-use */
 734                                 VALUE_PAIR *port_limit;
 735
 736                                 if ((port_limit = pairfind(request->reply->vps, PW_PORT_LIMIT, 0)) != NULL &&
 737                                         port_limit->vp_integer > check_item->vp_integer){
 738                                         RDEBUG2("MPP is OK");
 739                                         mpp_ok = 1;
 740                                 }
 741                         }
 742                         if (!mpp_ok){
 743                                 if (check_item->vp_integer > 1) {
 744                                 snprintf(umsg, sizeof(umsg),
 745                                                         "\r\nYou are already logged in %d times  - access denied\r\n\n",
 746                                                         (int)check_item->vp_integer);
 747                                         user_msg = umsg;
 748                                 } else {
 749                                         user_msg = "\r\nYou are already logged in - access denied\r\n\n";
 750                                 }
 751
 752                                 request->reply->code = PW_AUTHENTICATION_REJECT;
 753
 754                                 /*
 755                                  *      They're trying to log in too many times.
 756                                  *      Remove ALL reply attributes.
 757                                  */
 758                                 pairfree(&request->reply->vps);
 759                                 radius_pairmake(request, &request->reply->vps,
 760                                                 "Reply-Message",
 761                                                 user_msg, T_OP_SET);
 762
 763                                 snprintf(logstr, sizeof(logstr), "Multiple logins (max %d) %s",
 764                                         check_item->vp_integer,
 765                                         r == 2 ? "[MPP attempt]" : "");
 766                                 rad_authlog(logstr, request, 1);
 767
 768                                 result = -1;
 769                         }
 770                 }
 771         }
 772 #endif
 773
 774         /*
 775          *      Result should be >= 0 here - if not, it means the user
 776          *      is rejected, so we just process post-auth and return.
 777          */
 778         if (result < 0) {
 779                 return RLM_MODULE_REJECT;
 780         }
 781
 782         /*
 783          *      Set the reply to Access-Accept, if it hasn't already
 784          *      been set to something.  (i.e. Access-Challenge)
 785          */
 786         if (request->reply->code == 0)
 787           request->reply->code = PW_AUTHENTICATION_ACK;
 788
 789         if ((module_msg = pairfind(request->packet->vps,PW_MODULE_SUCCESS_MESSAGE, 0)) != NULL){
 790                 char msg[MAX_STRING_LEN+12];
 791
 792                 snprintf(msg, sizeof(msg), "Login OK (%s)",
 793                          module_msg->vp_strvalue);
 794                 rad_authlog(msg, request, 1);
 795         } else {
 796                 rad_authlog("Login OK", request, 1);
 797         }
 798
 799         return result;
 800 }
 801
 802 /*
 803  *      Run a virtual server auth and postauth
 804  *
 805  */
 806 int rad_virtual_server(REQUEST *request)
 807 {
 808         VALUE_PAIR *vp;
 809         int result;
 810
 811         /*
 812          *      We currently only handle AUTH packets here.
 813          *      This could be expanded to handle other packets as well if required.
 814          */
 815         rad_assert(request->packet->code == PW_AUTHENTICATION_REQUEST);
 816
 817         result = rad_authenticate(request);
 818
 819         if (request->reply->code == PW_AUTHENTICATION_REJECT) {
 820                 pairdelete(&request->config_items, PW_POST_AUTH_TYPE, 0);
 821                 vp = radius_pairmake(request, &request->config_items,
 822                                      "Post-Auth-Type", "Reject",
 823                                      T_OP_SET);
 824                 if (vp) rad_postauth(request);
 825         }
 826
 827         if (request->reply->code == PW_AUTHENTICATION_ACK) {
 828                 rad_postauth(request);
 829         }
 830
 831         return result;
 832 }
 833