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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  * Copyright 2000  The FreeRADIUS server project
  21  * Copyright 2000  Miquel van Smoorenburg <miquels@cistron.nl>
  22  * Copyright 2000  Jeff Carneal <jeff@apex.net>
  23  */
  24
  25 static const char rcsid[] = "$Id$";
  26
  27 #include "autoconf.h"
  28 #include "libradius.h"
  29
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <ctype.h>
  33
  34 #ifdef HAVE_NETINET_IN_H
  35 #       include <netinet/in.h>
  36 #endif
  37
  38 #include "radiusd.h"
  39 #include "modules.h"
  40
  41 /*
  42  *      Return a short string showing the terminal server, port
  43  *      and calling station ID.
  44  */
  45 char *auth_name(char *buf, size_t buflen, REQUEST *request, int do_cli) {
  46         VALUE_PAIR      *cli;
  47         VALUE_PAIR      *pair;
  48         int             port = 0;
  49
  50         if ((cli = pairfind(request->packet->vps, PW_CALLING_STATION_ID)) == NULL)
  51                 do_cli = 0;
  52         if ((pair = pairfind(request->packet->vps, PW_NAS_PORT)) != NULL)
  53                 port = pair->lvalue;
  54
  55         snprintf(buf, buflen, "from client %.128s port %u%s%.128s",
  56                         client_name(request->packet->src_ipaddr), port,
  57                         (do_cli ? " cli " : ""), (do_cli ? (char *)cli->strvalue : ""));
  58
  59         return buf;
  60 }
  61
  62
  63 /*
  64  *      Check if account has expired, and if user may login now.
  65  */
  66 static int check_expiration(REQUEST *request)
  67 {
  68         int result;
  69         VALUE_PAIR *check_item = request->config_items;
  70
  71         result = 0;
  72         while (result == 0 && check_item != NULL) {
  73
  74                 /*
  75                  *      Check expiration date if we are doing password aging.
  76                  */
  77                 if (check_item->attribute == PW_EXPIRATION) {
  78                         /*
  79                          *      Has this user's password expired?
  80                          *
  81                          *      If so, remove ALL reply attributes,
  82                          *      and add our own Reply-Message, saying
  83                          *      why they're being rejected.
  84                          */
  85                         if (check_item->lvalue < (unsigned) time(NULL)) {
  86                                 VALUE_PAIR *vp;
  87
  88                                 result = -1;
  89                                 vp = pairmake("Reply-Message",
  90                                                 "Password Has Expired\r\n",
  91                                                 T_OP_ADD);
  92                                 pairfree(&request->reply->vps);
  93                                 request->reply->vps = vp;
  94                                 break;
  95                         }
  96                 }
  97                 check_item = check_item->next;
  98         }
  99         return result;
 100 }
 101
 102
 103 /*
 104  * Make sure user/pass are clean
 105  * and then log them
 106  */
 107 static int rad_authlog(const char *msg, REQUEST *request, int goodpass) {
 108
 109         char clean_password[1024];
 110         char clean_username[1024];
 111         char buf[1024];
 112         VALUE_PAIR *username = NULL;
 113
 114         if (!mainconfig.log_auth) {
 115                 return 0;
 116         }
 117
 118         /*
 119          * Get the correct username based on the configured value
 120          */
 121         if (log_stripped_names == 0) {
 122                 username = pairfind(request->packet->vps, PW_USER_NAME);
 123         } else {
 124                 username = request->username;
 125         }
 126
 127         /*
 128          *      Clean up the username
 129          */
 130         if (username == NULL) {
 131                 strcpy(clean_username, "<no User-Name attribute>");
 132         } else {
 133                 librad_safeprint((char *)username->strvalue,
 134                                 username->length,
 135                                 clean_username, sizeof(clean_username));
 136         }
 137
 138         /*
 139          *      Clean up the password
 140          */
 141         if (mainconfig.log_auth_badpass || mainconfig.log_auth_goodpass) {
 142                 if (!request->password) {
 143                         strcpy(clean_password, "<no User-Password attribute>");
 144                 } else if (request->password->attribute == PW_CHAP_PASSWORD) {
 145                         strcpy(clean_password, "<CHAP-Password>");
 146                 } else {
 147                         librad_safeprint((char *)request->password->strvalue,
 148                                          request->password->length,
 149                                          clean_password, sizeof(clean_password));
 150                 }
 151         }
 152
 153         if (goodpass) {
 154                 radlog(L_AUTH, "%s: [%s%s%s] (%s)",
 155                                 msg,
 156                                 clean_username,
 157                                 mainconfig.log_auth_goodpass ? "/" : "",
 158                                 mainconfig.log_auth_goodpass ? clean_password : "",
 159                                 auth_name(buf, sizeof(buf), request, 1));
 160         } else {
 161                 radlog(L_AUTH, "%s: [%s%s%s] (%s)",
 162                                 msg,
 163                                 clean_username,
 164                                 mainconfig.log_auth_badpass ? "/" : "",
 165                                 mainconfig.log_auth_badpass ? clean_password : "",
 166                                 auth_name(buf, sizeof(buf), request, 1));
 167         }
 168
 169         return 0;
 170 }
 171
 172 /*
 173  *      Check password.
 174  *
 175  *      Returns:        0  OK
 176  *                      -1 Password fail
 177  *                      -2 Rejected (Auth-Type = Reject, send Port-Message back)
 178  *                      1  End check & return, don't reply
 179  *
 180  *      NOTE: NOT the same as the RLM_ values !
 181  */
 182 int rad_check_password(REQUEST *request)
 183 {
 184         VALUE_PAIR *auth_type_pair;
 185         VALUE_PAIR *cur_config_item;
 186         VALUE_PAIR *password_pair;
 187         VALUE_PAIR *auth_item;
 188         char string[MAX_STRING_LEN];
 189         int auth_type = -1;
 190         int result;
 191         int auth_type_count = 0;
 192         result = 0;
 193
 194         /*
 195          *      Look for matching check items. We skip the whole lot
 196          *      if the authentication type is PW_AUTHTYPE_ACCEPT or
 197          *      PW_AUTHTYPE_REJECT.
 198          */
 199         cur_config_item = request->config_items;
 200         while(((auth_type_pair = pairfind(cur_config_item, PW_AUTH_TYPE))) != NULL) {
 201                 auth_type = auth_type_pair->lvalue;
 202                 auth_type_count++;
 203
 204                 DEBUG2("  rad_check_password:  Found Auth-Type %s",
 205                                 auth_type_pair->strvalue);
 206                 cur_config_item = auth_type_pair->next;
 207
 208                 if (auth_type == PW_AUTHTYPE_REJECT) {
 209                         DEBUG2("  rad_check_password: Auth-Type = Reject, rejecting user");
 210                         return -2;
 211                 }
 212         }
 213
 214         if (( auth_type_count > 1) && (debug_flag)) {
 215                 radlog(L_ERR, "Warning:  Found %d auth-types on request for user '%s'",
 216                         auth_type_count, request->username->strvalue);
 217         }
 218
 219         /*
 220          *      This means we have a proxy reply or an accept
 221          *  and it wasn't rejected in the above loop.  So
 222          *  that means it is accepted and we do no further
 223          *  authentication
 224          */
 225         if ((auth_type == PW_AUTHTYPE_ACCEPT) || (request->proxy)) {
 226                 DEBUG2("  rad_check_password: Auth-Type = Accept, accepting the user");
 227                 return 0;
 228         }
 229
 230         /*
 231          *      Find the password from the users file.
 232          */
 233         if ((password_pair = pairfind(request->config_items, PW_CRYPT_PASSWORD)) != NULL) {
 234                 /*
 235                  *      Re-write Auth-Type, but ONLY if it isn't already
 236                  *      set.
 237                  */
 238                 if (auth_type == -1) auth_type = PW_AUTHTYPE_CRYPT;
 239         } else {
 240                 password_pair = pairfind(request->config_items, PW_PASSWORD);
 241         }
 242
 243         if (auth_type < 0) {
 244                 if (password_pair) {
 245                         auth_type = PW_AUTHTYPE_LOCAL;
 246                 } else {
 247                         /*
 248                         *       The admin hasn't told us how to
 249                         *       authenticate the user, so we reject them!
 250                         *
 251                         *       This is fail-safe.
 252                         */
 253                         DEBUG2("auth: No authenticate method (Auth-Type) configuration found for the request: Rejecting the user");
 254                         return -2;
 255                 }
 256         }
 257
 258         switch(auth_type) {
 259                 case PW_AUTHTYPE_CRYPT:
 260                         /*
 261                          *      Find the password sent by the user. It
 262                          *      SHOULD be there, if it's not
 263                          *      authentication fails.
 264                          */
 265                         auth_item = request->password;
 266                         if (auth_item == NULL) {
 267                                 DEBUG2("auth: No User-Password or CHAP-Password attribute in the request");
 268                                 return -1;
 269                         }
 270
 271                         DEBUG2("auth: type Crypt");
 272                         if (password_pair == NULL) {
 273                                 DEBUG2("No Crypt-Password configured for the user");
 274                                 rad_authlog("Login incorrect "
 275                                         "(No Crypt-Password configured for the user)", request, 0);
 276                                 return -1;
 277                         }
 278
 279                         switch (lrad_crypt_check((char *)auth_item->strvalue,
 280                                                                          (char *)password_pair->strvalue)) {
 281                         case -1:
 282                           rad_authlog("Login incorrect "
 283                                                   "(system failed to supply an encrypted password for comparison)", request, 0);
 284                         case 1:
 285                           return -1;
 286                         }
 287                         break;
 288                 case PW_AUTHTYPE_LOCAL:
 289                         DEBUG2("auth: type Local");
 290
 291                         /*
 292                          *      Find the password sent by the user. It
 293                          *      SHOULD be there, if it's not
 294                          *      authentication fails.
 295                          */
 296                         auth_item = request->password;
 297                         if (auth_item == NULL) {
 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_PASSWORD) {
 316                                 if (strcmp((char *)password_pair->strvalue,
 317                                            (char *)auth_item->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, string,
 332                                         auth_item->strvalue[0], password_pair);
 333
 334                         /*
 335                          *      Compare them
 336                          */
 337                         if (memcmp(string + 1, auth_item->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                         DEBUG2("auth: type \"%s\"",
 346                                         dict_valbyattr(PW_AUTH_TYPE, auth_type)->name);
 347                         /*
 348                          *      See if there is a module that handles
 349                          *      this type, and turn the RLM_ return
 350                          *      status into the values as defined at
 351                          *      the top of this function.
 352                          */
 353                         result = module_authenticate(auth_type, request);
 354                         switch (result) {
 355                                 /*
 356                                  *      An authentication module FAIL
 357                                  *      return code, or any return code that
 358                                  *      is not expected from authentication,
 359                                  *      is the same as an explicit REJECT!
 360                                  */
 361                                 case RLM_MODULE_FAIL:
 362                                 case RLM_MODULE_REJECT:
 363                                 case RLM_MODULE_USERLOCK:
 364                                 case RLM_MODULE_INVALID:
 365                                 case RLM_MODULE_NOTFOUND:
 366                                 case RLM_MODULE_NOOP:
 367                                 case RLM_MODULE_UPDATED:
 368                                         result = -1;
 369                                         break;
 370                                 case RLM_MODULE_OK:
 371                                         result = 0;
 372                                         break;
 373                                 case RLM_MODULE_HANDLED:
 374                                         result = 1;
 375                                         break;
 376                         }
 377                         break;
 378         }
 379
 380         return result;
 381 }
 382
 383 /*
 384  *      Post-authentication step processes the response before it is
 385  *      sent to the NAS. It can receive both Access-Accept and Access-Reject
 386  *      replies.
 387  */
 388 static int rad_postauth(REQUEST *request)
 389 {
 390         int     result;
 391         int     postauth_type = 0;
 392         VALUE_PAIR      *postauth_type_item = NULL;
 393
 394         /*
 395          *      Do post-authentication calls. ignoring the return code.
 396          */
 397         postauth_type_item = pairfind(request->config_items, PW_POST_AUTH_TYPE);
 398         if (postauth_type_item)
 399                 postauth_type = postauth_type_item->lvalue;
 400         result = module_post_auth(postauth_type, request);
 401         switch (result) {
 402         default:
 403           break;
 404
 405           /*
 406            *    The module failed, or said to reject the user: Do so.
 407            */
 408         case RLM_MODULE_FAIL:
 409         case RLM_MODULE_REJECT:
 410         case RLM_MODULE_USERLOCK:
 411         case RLM_MODULE_INVALID:
 412           request->reply->code = PW_AUTHENTICATION_REJECT;
 413           result = RLM_MODULE_REJECT;
 414           break;
 415
 416           /*
 417            *    The module had a number of OK return codes.
 418            */
 419         case RLM_MODULE_NOTFOUND:
 420         case RLM_MODULE_NOOP:
 421         case RLM_MODULE_UPDATED:
 422         case RLM_MODULE_OK:
 423         case RLM_MODULE_HANDLED:
 424           result = RLM_MODULE_OK;
 425           break;
 426         }
 427         return result;
 428 }
 429
 430 /*
 431  *      Process and reply to an authentication request
 432  *
 433  *      The return value of this function isn't actually used right now, so
 434  *      it's not entirely clear if it is returning the right things. --Pac.
 435  */
 436 int rad_authenticate(REQUEST *request)
 437 {
 438         VALUE_PAIR      *namepair;
 439         VALUE_PAIR      *check_item;
 440         VALUE_PAIR      *reply_item;
 441         VALUE_PAIR      *auth_item;
 442         VALUE_PAIR      *module_msg;
 443         VALUE_PAIR      *tmp = NULL;
 444         int             result, r;
 445         char            umsg[MAX_STRING_LEN + 1];
 446         const char      *user_msg = NULL;
 447         const char      *password;
 448         char            *exec_program;
 449         int             exec_wait;
 450         int             seen_callback_id;
 451         char            buf[1024], logstr[1024];
 452         char            autz_retry = 0;
 453         int             autz_type = 0;
 454
 455         password = "";
 456
 457         /*
 458          *      If this request got proxied to another server,
 459          *      AND it was an authentication request, then we need
 460          *      to add an initial Auth-Type: Auth-Accept for success,
 461          *      Auth-Reject for fail. We also need to add the reply
 462          *      pairs from the server to the initial reply.
 463          */
 464         if ((request->proxy_reply) &&
 465             (request->packet->code == PW_AUTHENTICATION_REQUEST)) {
 466                 tmp = paircreate(PW_AUTH_TYPE, PW_TYPE_INTEGER);
 467                 if (tmp == NULL) {
 468                         radlog(L_ERR|L_CONS, "no memory");
 469                         exit(1);
 470                 }
 471
 472                 /*
 473                  *      Challenges are punted back to the NAS
 474                  *      without any further processing.
 475                  */
 476                 if (request->proxy_reply->code == PW_ACCESS_CHALLENGE) {
 477                         request->reply->code = PW_ACCESS_CHALLENGE;
 478                         return RLM_MODULE_HANDLED;
 479                 }
 480
 481                 /*
 482                  *      Reply of ACCEPT means accept, ALL other
 483                  *      replies mean reject.  This is fail-safe.
 484                  */
 485                 if (request->proxy_reply->code == PW_AUTHENTICATION_ACK)
 486                         tmp->lvalue = PW_AUTHTYPE_ACCEPT;
 487                 else
 488                         tmp->lvalue = PW_AUTHTYPE_REJECT;
 489                 pairadd(&request->config_items, tmp);
 490
 491                 /*
 492                  *      If it's an Access-Reject, then do NOT do any
 493                  *      authorization or authentication.  They're being
 494                  *      rejected, so we minimize the amount of work
 495                  *      done by the server, by rejecting them here.
 496                  */
 497                 if ((request->proxy_reply->code != PW_AUTHENTICATION_ACK) &&
 498                     (request->proxy_reply->code != PW_ACCESS_CHALLENGE)) {
 499                         rad_authlog("Login incorrect (Home Server says so)", request, 0);
 500                         request->reply->code = PW_AUTHENTICATION_REJECT;
 501                         return RLM_MODULE_REJECT;
 502                 }
 503         }
 504
 505         /*
 506          *      Get the username from the request.
 507          *
 508          *      Note that namepair MAY be NULL, in which case there
 509          *      is no User-Name attribute in the request.
 510          */
 511         namepair = request->username;
 512
 513         /*
 514          *      Look for, and cache, passwords.
 515          */
 516         if (!request->password) {
 517                 request->password = pairfind(request->packet->vps,
 518                                              PW_PASSWORD);
 519         }
 520
 521         /*
 522          *      Discover which password we want to use.
 523          */
 524         auth_item = request->password;
 525         if (auth_item) {
 526                 password = (const char *)auth_item->strvalue;
 527
 528         } else {
 529                 /*
 530                  *      Maybe there's a CHAP-Password?
 531                  */
 532                 if ((auth_item = pairfind(request->packet->vps,
 533                                 PW_CHAP_PASSWORD)) != NULL) {
 534                         password = "<CHAP-PASSWORD>";
 535
 536                 } else {
 537                         /*
 538                          *      No password we recognize.
 539                          */
 540                         password = "<NO-PASSWORD>";
 541                 }
 542         }
 543         request->password = auth_item;
 544
 545         /*
 546          *      Get the user's authorization information from the database
 547          */
 548 autz_redo:
 549         r = module_authorize(autz_type, request);
 550         if (r != RLM_MODULE_NOTFOUND &&
 551             r != RLM_MODULE_NOOP &&
 552             r != RLM_MODULE_OK &&
 553             r != RLM_MODULE_UPDATED) {
 554                 if (r != RLM_MODULE_FAIL && r != RLM_MODULE_HANDLED) {
 555                         if ((module_msg = pairfind(request->packet->vps,
 556                                         PW_MODULE_FAILURE_MESSAGE)) != NULL){
 557                                 char msg[MAX_STRING_LEN+16];
 558                                 snprintf(msg, sizeof(msg), "Invalid user (%s)",
 559                                          module_msg->strvalue);
 560                                 rad_authlog(msg,request,0);
 561                         } else {
 562                                 rad_authlog("Invalid user", request, 0);
 563                         }
 564                         request->reply->code = PW_AUTHENTICATION_REJECT;
 565                 }
 566                 return r;
 567         }
 568         if (!autz_retry){
 569                 VALUE_PAIR      *autz_type_item = NULL;
 570                 autz_type_item = pairfind(request->config_items, PW_AUTZ_TYPE);
 571                 if (autz_type_item){
 572                         autz_type = autz_type_item->lvalue;
 573                         autz_retry = 1;
 574                         goto autz_redo;
 575                 }
 576         }
 577
 578         /*
 579          *      If we haven't already proxied the packet, then check
 580          *      to see if we should.  Maybe one of the authorize
 581          *      modules has decided that a proxy should be used. If
 582          *      so, get out of here and send the packet.
 583          */
 584         if ((request->proxy == NULL) &&
 585             ((tmp = pairfind(request->config_items, PW_PROXY_TO_REALM)) != NULL)) {
 586                 REALM *realm;
 587
 588                 /*
 589                  *      Catch users who set Proxy-To-Realm to a LOCAL
 590                  *      realm (sigh).
 591                  */
 592                 realm = realm_find(tmp->strvalue, 0);
 593                 if (realm && (realm->ipaddr == htonl(INADDR_NONE))) {
 594                         DEBUG2("  WARNING: You set Proxy-To-Realm = %s, but it is a LOCAL realm!  Cancelling invalid proxy request.", realm->realm);
 595                 } else {
 596                         /*
 597                          *      Don't authenticate, as the request is
 598                          *      proxied.
 599                          */
 600                         return RLM_MODULE_OK;
 601                 }
 602         }
 603
 604         /*
 605          *      Perhaps there is a Stripped-User-Name now.
 606          */
 607         namepair = request->username;
 608
 609         /*
 610          *      Validate the user
 611          */
 612         do {
 613                 if ((result = check_expiration(request)) < 0)
 614                                 break;
 615                 result = rad_check_password(request);
 616                 if (result > 0) {
 617                         /* don't reply! */
 618                         return RLM_MODULE_HANDLED;
 619                 }
 620         } while(0);
 621
 622         /*
 623          *      Failed to validate the user.
 624          *
 625          *      We PRESUME that the code which failed will clean up
 626          *      request->reply->vps, to be ONLY the reply items it
 627          *      wants to send back.
 628          */
 629         if (result < 0) {
 630                 DEBUG2("auth: Failed to validate the user.");
 631                 request->reply->code = PW_AUTHENTICATION_REJECT;
 632
 633                 if ((module_msg = pairfind(request->packet->vps,PW_MODULE_FAILURE_MESSAGE)) != NULL){
 634                         char msg[MAX_STRING_LEN+19];
 635
 636                         snprintf(msg, sizeof(msg), "Login incorrect (%s)",
 637                                  module_msg->strvalue);
 638                         rad_authlog(msg, request, 0);
 639                 } else {
 640                         rad_authlog("Login incorrect", request, 0);
 641                 }
 642
 643                 /* double check: maybe the secret is wrong? */
 644                 if ((debug_flag > 1) && (auth_item != NULL) &&
 645                                 (auth_item->attribute == PW_PASSWORD)) {
 646                         u_char *p;
 647
 648                         p = auth_item->strvalue;
 649                         while (*p != '\0') {
 650                                 if (!isprint((int) *p)) {
 651                                         log_debug("  WARNING: Unprintable characters in the password.\n\t  Double-check the shared secret on the server and the NAS!");
 652                                         break;
 653                                 }
 654                                 p++;
 655                         }
 656                 }
 657         }
 658
 659         if (result >= 0 &&
 660             (check_item = pairfind(request->config_items, PW_SIMULTANEOUS_USE)) != NULL) {
 661                 VALUE_PAIR      *session_type;
 662                 int             sess_type = 0;
 663
 664                 session_type = pairfind(request->config_items, PW_SESSION_TYPE);
 665                 if (session_type)
 666                         sess_type = session_type->lvalue;
 667
 668                 /*
 669                  *      User authenticated O.K. Now we have to check
 670                  *      for the Simultaneous-Use parameter.
 671                  */
 672                 if (namepair &&
 673                     (r = module_checksimul(sess_type,request, check_item->lvalue)) != 0) {
 674                         char mpp_ok = 0;
 675
 676                         if (r == 2){
 677                                 /* Multilink attempt. Check if port-limit > simultaneous-use */
 678                                 VALUE_PAIR *port_limit;
 679
 680                                 if ((port_limit = pairfind(request->reply->vps, PW_PORT_LIMIT)) != NULL &&
 681                                         port_limit->lvalue > check_item->lvalue){
 682                                         DEBUG2("main auth: MPP is OK");
 683                                         mpp_ok = 1;
 684                                 }
 685                         }
 686                         if (!mpp_ok){
 687                                 if (check_item->lvalue > 1) {
 688                                 snprintf(umsg, sizeof(umsg),
 689                                                         "\r\nYou are already logged in %d times  - access denied\r\n\n",
 690                                                         (int)check_item->lvalue);
 691                                         user_msg = umsg;
 692                                 } else {
 693                                         user_msg = "\r\nYou are already logged in - access denied\r\n\n";
 694                                 }
 695
 696                                 request->reply->code = PW_AUTHENTICATION_REJECT;
 697
 698                                 /*
 699                                  *      They're trying to log in too many times.
 700                                  *      Remove ALL reply attributes.
 701                                  */
 702                                 pairfree(&request->reply->vps);
 703                                 tmp = pairmake("Reply-Message", user_msg, T_OP_SET);
 704                                 request->reply->vps = tmp;
 705
 706                                 snprintf(logstr, sizeof(logstr), "Multiple logins (max %d) %s",
 707                                         check_item->lvalue,
 708                                         r == 2 ? "[MPP attempt]" : "");
 709                                 rad_authlog(logstr, request, 1);
 710
 711                                 result = -1;
 712                         }
 713                 }
 714         }
 715
 716         if (result >= 0 &&
 717             (check_item = pairfind(request->config_items, PW_LOGIN_TIME)) != NULL) {
 718
 719                 /*
 720                  *      Authentication is OK. Now see if this
 721                  *      user may login at this time of the day.
 722                  */
 723                 r = timestr_match((char *)check_item->strvalue,
 724                                   request->timestamp);
 725
 726                 if (r == 0) {   /* unlimited */
 727                         /*
 728                          *      Do nothing: login-time is OK.
 729                          */
 730
 731                         /*
 732                          *      Session-Timeout needs to be at least
 733                          *      60 seconds, some terminal servers
 734                          *      ignore smaller values.
 735                          */
 736                 } else if (r < 60) {
 737                         /*
 738                          *      User called outside allowed time interval.
 739                          */
 740                         result = -1;
 741                         user_msg = "You are calling outside your allowed timespan\r\n";
 742
 743                         request->reply->code = PW_AUTHENTICATION_REJECT;
 744                         pairfree(&request->reply->vps);
 745
 746                         tmp = pairmake("Reply-Message", user_msg, T_OP_SET);
 747                         request->reply->vps = tmp;
 748
 749                         snprintf(logstr, sizeof(logstr), "Outside allowed timespan (time allowed %s)",
 750                                  check_item->strvalue);
 751                         rad_authlog(logstr, request, 1);
 752
 753                 } else if (r > 0) {
 754
 755                         /*
 756                          *      User is allowed, but set Session-Timeout.
 757                          */
 758                         if ((reply_item = pairfind(request->reply->vps,
 759                                         PW_SESSION_TIMEOUT)) != NULL) {
 760                                 if (reply_item->lvalue > (unsigned) r)
 761                                         reply_item->lvalue = r;
 762                         } else {
 763                                 if ((reply_item = paircreate(
 764                                                 PW_SESSION_TIMEOUT,
 765                                                 PW_TYPE_INTEGER)) == NULL) {
 766                                         radlog(L_ERR|L_CONS, "no memory");
 767                                         exit(1);
 768                                 }
 769                                 reply_item->lvalue = r;
 770                                 pairadd(&request->reply->vps, reply_item);
 771                         }
 772                 }
 773         }
 774
 775         /*
 776          *      Result should be >= 0 here - if not, it means the user
 777          *      is rejected, so we overwrite the Post-Auth-Type with
 778          *      the value REJECT and cal the post-authentication
 779          *      step.
 780          */
 781         if (result < 0) {
 782                 DICT_VALUE *dval;
 783
 784                 dval = dict_valbyname(PW_POST_AUTH_TYPE, "REJECT");
 785                 if (dval) {
 786                         pairdelete(&request->config_items, PW_POST_AUTH_TYPE);
 787                         tmp = paircreate(PW_POST_AUTH_TYPE, PW_TYPE_INTEGER);
 788                         tmp->lvalue = dval->value;
 789                         pairadd(&request->config_items, tmp);
 790                         rad_postauth(request);
 791                 }
 792                 return RLM_MODULE_OK;
 793         }
 794
 795         /*
 796          *      We might need this later.  The 'password' string
 797          *      is NOT used anywhere below here, except for logging,
 798          *      so it should be safe...
 799          */
 800         if ((auth_item != NULL) && (auth_item->attribute == PW_CHAP_PASSWORD)) {
 801                 password = "CHAP-Password";
 802         }
 803
 804         /*
 805          *      Add the port number to the Framed-IP-Address if
 806          *      vp->addport is set.
 807          */
 808         if (((tmp = pairfind(request->reply->vps,
 809                              PW_FRAMED_IP_ADDRESS)) != NULL) &&
 810             (tmp->flags.addport != 0)) {
 811                 VALUE_PAIR *vpPortId;
 812
 813                 /*
 814                  *  Find the NAS port ID.
 815                  */
 816                 if ((vpPortId = pairfind(request->packet->vps,
 817                                          PW_NAS_PORT)) != NULL) {
 818                   unsigned long tvalue = ntohl(tmp->lvalue);
 819                   tmp->lvalue = htonl(tvalue + vpPortId->lvalue);
 820                   tmp->flags.addport = 0;
 821                   ip_ntoa(tmp->strvalue, tmp->lvalue);
 822                 } else {
 823                         DEBUG2("WARNING: No NAS-Port attribute in request.  CANNOT return a Framed-IP-Address + NAS-Port.\n");
 824                         pairdelete(&request->reply->vps, PW_FRAMED_IP_ADDRESS);
 825                 }
 826         }
 827
 828         /*
 829          *      See if we need to execute a program.
 830          *      FIXME: somehow cache this info, and only execute the
 831          *      program when we receive an Accounting-START packet.
 832          *      Only at that time we know dynamic IP etc.
 833          */
 834         exec_program = NULL;
 835         exec_wait = 0;
 836         if ((auth_item = pairfind(request->reply->vps, PW_EXEC_PROGRAM)) != NULL) {
 837                 exec_wait = 0;
 838                 exec_program = strdup((char *)auth_item->strvalue);
 839                 pairdelete(&request->reply->vps, PW_EXEC_PROGRAM);
 840         }
 841         if ((auth_item = pairfind(request->reply->vps, PW_EXEC_PROGRAM_WAIT)) != NULL) {
 842                 exec_wait = 1;
 843                 exec_program = strdup((char *)auth_item->strvalue);
 844                 pairdelete(&request->reply->vps, PW_EXEC_PROGRAM_WAIT);
 845         }
 846
 847         /*
 848          *      Hack - allow % expansion in certain value strings.
 849          *      This is nice for certain Exec-Program programs.
 850          */
 851         seen_callback_id = 0;
 852         if ((auth_item = pairfind(request->reply->vps, PW_CALLBACK_ID)) != NULL) {
 853                 seen_callback_id = 1;
 854                 radius_xlat(buf, sizeof(auth_item->strvalue),
 855                             (char *)auth_item->strvalue, request, NULL);
 856                 strNcpy((char *)auth_item->strvalue, buf,
 857                         sizeof(auth_item->strvalue));
 858                 auth_item->length = strlen((char *)auth_item->strvalue);
 859         }
 860
 861
 862         /*
 863          *      If we want to exec a program, but wait for it,
 864          *      do it first before sending the reply.
 865          */
 866         if (exec_program && exec_wait) {
 867                 r = radius_exec_program(exec_program, request,
 868                                         exec_wait,
 869                                         umsg, sizeof(umsg),
 870                                         request->packet->vps, &tmp);
 871                 free(exec_program);
 872                 exec_program = NULL;
 873
 874                 /*
 875                  *      Always add the value-pairs to the reply.
 876                  */
 877                 pairmove(&request->reply->vps, &tmp);
 878                 pairfree(&tmp);
 879
 880                 if (r != 0) {
 881                         /*
 882                          *      Error. radius_exec_program() returns -1 on
 883                          *      fork/exec errors, or >0 if the exec'ed program
 884                          *      had a non-zero exit status.
 885                          */
 886                         if (umsg[0] == '\0') {
 887                                 user_msg = "\r\nAccess denied (external check failed).";
 888                         } else {
 889                                 user_msg = &umsg[0];
 890                         }
 891
 892                         request->reply->code = PW_AUTHENTICATION_REJECT;
 893                         tmp = pairmake("Reply-Message", user_msg, T_OP_SET);
 894
 895                         pairadd(&request->reply->vps, tmp);
 896                         rad_authlog("Login incorrect (external check failed)",
 897                                         request, 0);
 898
 899                         return RLM_MODULE_REJECT;
 900                 }
 901         }
 902
 903         /*
 904          *      Delete "normal" A/V pairs when using callback.
 905          *
 906          *      FIXME: This is stupid. The portmaster should accept
 907          *      these settings instead of insisting on using a
 908          *      dialout location.
 909          *
 910          *      FIXME2: Move this into the above exec thingy?
 911          *      (if you knew how I use the exec_wait, you'd understand).
 912          */
 913         if (seen_callback_id) {
 914                 pairdelete(&request->reply->vps, PW_FRAMED_PROTOCOL);
 915                 pairdelete(&request->reply->vps, PW_FRAMED_IP_ADDRESS);
 916                 pairdelete(&request->reply->vps, PW_FRAMED_IP_NETMASK);
 917                 pairdelete(&request->reply->vps, PW_FRAMED_ROUTE);
 918                 pairdelete(&request->reply->vps, PW_FRAMED_MTU);
 919                 pairdelete(&request->reply->vps, PW_FRAMED_COMPRESSION);
 920                 pairdelete(&request->reply->vps, PW_FILTER_ID);
 921                 pairdelete(&request->reply->vps, PW_PORT_LIMIT);
 922                 pairdelete(&request->reply->vps, PW_CALLBACK_NUMBER);
 923         }
 924
 925         /*
 926          *      Filter (possibly multiple) Reply-Message attributes
 927          *      through radius_xlat, modifying them in place.
 928          */
 929         if (user_msg == NULL) {
 930                 reply_item = pairfind(request->reply->vps, PW_REPLY_MESSAGE);
 931                 while (reply_item) {
 932                         radius_xlat(buf, sizeof(reply_item->strvalue),
 933                                     (char *)reply_item->strvalue, request, NULL);
 934                         strNcpy((char *)reply_item->strvalue, buf,
 935                                 sizeof(reply_item->strvalue));
 936                         reply_item->length = strlen((char *)reply_item->strvalue);
 937                         user_msg = NULL;
 938                         reply_item = pairfind(reply_item->next, PW_REPLY_MESSAGE);
 939                 }
 940         }
 941
 942         /*
 943          *      Set the reply to Access-Accept, if it hasn't already
 944          *      been set to something.  (i.e. Access-Challenge)
 945          */
 946         if (request->reply->code == 0)
 947           request->reply->code = PW_AUTHENTICATION_ACK;
 948
 949         if ((module_msg = pairfind(request->packet->vps,PW_MODULE_SUCCESS_MESSAGE)) != NULL){
 950                 char msg[MAX_STRING_LEN+12];
 951
 952                 snprintf(msg, sizeof(msg), "Login OK (%s)",
 953                          module_msg->strvalue);
 954                 rad_authlog(msg, request, 1);
 955         } else {
 956                 rad_authlog("Login OK", request, 1);
 957         }
 958
 959         if (exec_program && !exec_wait) {
 960                 /*
 961                  *      No need to check the exit status here.
 962                  */
 963                 radius_exec_program(exec_program, request, exec_wait,
 964                                     NULL, 0, request->packet->vps, NULL);
 965         }
 966
 967         if (exec_program)
 968                 free(exec_program);
 969
 970         result = rad_postauth(request);
 971
 972         return result;
 973 }