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 von Smoorenburg <miquels@cistron.nl>
  22  * Copyright 2000  Jeff Carneal <jeff@apex.net>
  23  */
  24 static const char rcsid[] = "$Id$";
  25
  26 #include        "autoconf.h"
  27 #include        "libradius.h"
  28
  29 #include        <stdlib.h>
  30 #include        <string.h>
  31 #include        <ctype.h>
  32
  33 #if HAVE_CRYPT_H
  34 #  include <crypt.h>
  35 #endif
  36
  37 #ifdef OSFC2
  38 #  include      <sys/security.h>
  39 #  include      <prot.h>
  40 #endif
  41
  42 #if HAVE_NETINET_IN_H
  43 #  include      <netinet/in.h>
  44 #endif
  45
  46 #include        "radiusd.h"
  47 #include        "modules.h"
  48
  49 /*
  50  *      Return a short string showing the terminal server, port
  51  *      and calling station ID.
  52  */
  53 char *auth_name(char *buf, size_t buflen, REQUEST *request, int do_cli)
  54 {
  55         VALUE_PAIR      *cli;
  56         VALUE_PAIR      *pair;
  57         int             port = 0;
  58
  59         if ((cli = pairfind(request->packet->vps, PW_CALLING_STATION_ID)) == NULL)
  60                 do_cli = 0;
  61         if ((pair = pairfind(request->packet->vps, PW_NAS_PORT_ID)) != NULL)
  62                 port = pair->lvalue;
  63
  64         snprintf(buf, buflen, "from nas %.128s port %d%s%.128s",
  65                  nas_name2(request->packet), port,
  66                  (do_cli ? " cli " : ""), (do_cli ? (char *)cli->strvalue : ""));
  67
  68         return buf;
  69 }
  70
  71
  72 /*
  73  *      Check if account has expired, and if user may login now.
  74  */
  75 static int check_expiration(REQUEST *request)
  76 {
  77         int result;
  78         VALUE_PAIR *check_item = request->config_items;
  79
  80         result = 0;
  81         while (result == 0 && check_item != NULL) {
  82
  83                 /*
  84                  *      Check expiration date if we are doing password aging.
  85                  */
  86                 if (check_item->attribute == PW_EXPIRATION) {
  87                         /*
  88                          *      Has this user's password expired?
  89                          *
  90                          *      If so, remove ALL reply attributes,
  91                          *      and add our own Reply-Message, saying
  92                          *      why they're being rejected.
  93                          */
  94                         if (check_item->lvalue < (unsigned) time(NULL)) {
  95                                 VALUE_PAIR *vp;
  96
  97                                 result = -1;
  98                                 vp = pairmake("Reply-Message",
  99                                               "Password Has Expired\r\n",
 100                                               T_OP_ADD);
 101                                 pairfree(&request->reply->vps);
 102                                 request->reply->vps = vp;
 103                                 break;
 104                         }
 105                 }
 106                 check_item = check_item->next;
 107         }
 108         return result;
 109 }
 110
 111
 112 /*
 113  * Make sure user/pass are clean
 114  * and then log them
 115  */
 116 static int rad_authlog(const char *msg, REQUEST *request, int goodpass) {
 117
 118         char clean_password[1024];
 119         char clean_username[1024];
 120         char buf[1024];
 121
 122         if (!mainconfig.log_auth)
 123                 return 0;
 124
 125         /*
 126          *      Clean up the username
 127          */
 128         if (!request->username) {
 129                 DEBUG2("rad_authlog:  no username found");
 130                 return -1;
 131         }
 132
 133         if (request->username->strvalue) {
 134                 librad_safeprint((char *)request->username->strvalue,
 135                                  request->username->length,
 136                                  clean_username, sizeof(clean_username));
 137         } else {
 138                 strcpy(clean_username, "<No Username>");
 139         }
 140
 141         /*
 142          *      Clean up the password
 143          */
 144         if (mainconfig.log_auth_badpass || mainconfig.log_auth_goodpass) {
 145                 if (!request->password) {
 146                         DEBUG2("rad_authlog:  no password found");
 147                         return -1;
 148                 }
 149
 150                 if (request->password->attribute == PW_CHAP_PASSWORD) {
 151                         strcpy(clean_password, "<CHAP-Password>");
 152                 } else {
 153                         if (request->username->strvalue) {
 154                                 librad_safeprint((char *)request->password->strvalue,
 155                                                  request->password->length,
 156                                                  clean_password, sizeof(clean_password));
 157                         } else {
 158                                 strcpy(clean_password, "<No Password>");
 159                         }
 160                 }
 161         }
 162
 163         if (goodpass) {
 164                 radlog(L_AUTH, "%s: [%s%s%s] (%s)",
 165                        msg,
 166                        clean_username,
 167                        mainconfig.log_auth_goodpass ? "/" : "",
 168                        mainconfig.log_auth_goodpass ? clean_password : "",
 169                        auth_name(buf, sizeof(buf), request, 1));
 170         } else {
 171                 radlog(L_AUTH, "%s: [%s%s%s] (%s)",
 172                        msg,
 173                        clean_username,
 174                        mainconfig.log_auth_badpass ? "/" : "",
 175                        mainconfig.log_auth_badpass ? clean_password : "",
 176                        auth_name(buf, sizeof(buf), request, 1));
 177         }
 178
 179         return 0;
 180 }
 181
 182 /*
 183  *      Check password.
 184  *
 185  *      Returns:        0  OK
 186  *                      -1 Password fail
 187  *                      -2 Rejected (Auth-Type = Reject, send Port-Message back)
 188  *                      1  End check & return, don't reply
 189  *
 190  *      NOTE: NOT the same as the RLM_ values !
 191  */
 192 int rad_check_password(REQUEST *request)
 193 {
 194         VALUE_PAIR      *auth_type_pair;
 195         VALUE_PAIR      *cur_config_item;
 196         VALUE_PAIR      *password_pair;
 197         VALUE_PAIR      *auth_item;
 198         char            string[MAX_STRING_LEN];
 199         int             auth_type = -1;
 200         int             result;
 201         int             auth_type_count = 0;
 202         result = 0;
 203
 204         /*
 205          *      Look for matching check items. We skip the whole lot
 206          *      if the authentication type is PW_AUTHTYPE_ACCEPT or
 207          *      PW_AUTHTYPE_REJECT.
 208          */
 209         cur_config_item = request->config_items;
 210         while(((auth_type_pair = pairfind(cur_config_item, PW_AUTHTYPE))) != NULL) {
 211                 auth_type = auth_type_pair->lvalue;
 212                 auth_type_count++;
 213
 214                 DEBUG2("  rad_check_password:  Found auth-type %d", auth_type);
 215                 cur_config_item = auth_type_pair->next;
 216
 217                 if (auth_type == PW_AUTHTYPE_REJECT) {
 218                         DEBUG2("  rad_check_password: Auth-Type = Reject, rejecting user");
 219                         return -2;
 220                 }
 221         }
 222
 223         if((auth_type_count>1) && (debug_flag)) {
 224                 radlog(L_ERR, "Warning:  Found %d auth-types on request for user '%s'",
 225                         auth_type_count, request->username->strvalue);
 226         }
 227
 228         /*
 229          *      This means we have a proxy reply or an accept
 230          *  and it wasn't rejected in the above loop.  So
 231    *  that means it is accepted and we do no further
 232          *  authentication
 233    */
 234         if ((auth_type == PW_AUTHTYPE_ACCEPT) || (request->proxy)) {
 235                 DEBUG2("  rad_check_password: Auth-Type = Accept, accepting the user");
 236                 return 0;
 237         }
 238
 239         /*
 240          *      Find the password sent by the user. It SHOULD be there,
 241          *      if it's not authentication fails.
 242          *
 243          *      FIXME: add MS-CHAP support ?
 244          */
 245         auth_item = request->password;
 246         if (auth_item == NULL) {
 247                 DEBUG2("  auth: No password in the request");
 248                 return -1;
 249         }
 250
 251         /*
 252          *      Find the password from the users file.
 253          */
 254         if ((password_pair = pairfind(request->config_items, PW_CRYPT_PASSWORD)) != NULL)
 255                 auth_type = PW_AUTHTYPE_CRYPT;
 256         else
 257                 password_pair = pairfind(request->config_items, PW_PASSWORD);
 258
 259         /*
 260          *      For backward compatibility, we check the
 261          *      password to see if it is the magic value
 262          *      UNIX if auth_type was not set.
 263          */
 264         if (auth_type < 0) {
 265                 if (password_pair &&
 266                     !strcmp((char *)password_pair->strvalue, "UNIX"))
 267                         auth_type = PW_AUTHTYPE_SYSTEM;
 268                 else if(password_pair &&
 269                         !strcmp((char *)password_pair->strvalue,"PAM"))
 270                         auth_type = PW_AUTHTYPE_PAM;
 271                 else
 272                         auth_type = PW_AUTHTYPE_LOCAL;
 273         }
 274
 275         switch(auth_type) {
 276                 case PW_AUTHTYPE_CRYPT:
 277                         DEBUG2("  auth: Crypt");
 278                         if (password_pair == NULL) {
 279                                 result = auth_item->strvalue ? -1 : 0;
 280                                 break;
 281                         }
 282                         if (strcmp((char *)password_pair->strvalue,
 283                             crypt((char *)auth_item->strvalue,
 284                                   (char *)password_pair->strvalue)) != 0)
 285                                         result = -1;
 286                         break;
 287                 case PW_AUTHTYPE_LOCAL:
 288                         DEBUG2("  auth: Local");
 289                         /*
 290                          *      Local password is just plain text.
 291                          */
 292                         if (auth_item->attribute != PW_CHAP_PASSWORD) {
 293
 294                                 /*
 295                                  *      Plain text password.
 296                                  */
 297                                 if (password_pair == NULL ||
 298                                     strcmp((char *)password_pair->strvalue,
 299                                            (char *)auth_item->strvalue)!=0)
 300                                         result = -1;
 301                                 break;
 302                         }
 303
 304                         /*
 305                          *      CHAP - calculate MD5 sum over CHAP-ID,
 306                          *      plain-text password and the Chap-Challenge.
 307                          *      Compare to Chap-Response (strvalue + 1).
 308                          */
 309                         if (password_pair == NULL) {
 310                                 result= -1;
 311                                 break;
 312                         }
 313                         rad_chap_encode(request->packet, string,
 314                                         auth_item->strvalue[0], password_pair);
 315
 316                         /*
 317                          *      Compare them
 318                          */
 319                         if (memcmp(string + 1, auth_item->strvalue + 1,
 320                                         CHAP_VALUE_LENGTH) != 0)
 321                                 result = -1;
 322                         break;
 323                 default:
 324                         DEBUG2("  auth: %s",
 325                                dict_valbyattr(PW_AUTHTYPE, auth_type)->name);
 326                         /*
 327                          *      See if there is a module that handles
 328                          *      this type, and turn the RLM_ return
 329                          *      status into the values as defined at
 330                          *      the top of this function.
 331                          */
 332                         result = module_authenticate(auth_type, request);
 333                         switch (result) {
 334                                 /*
 335                                  *      An authentication module FAIL
 336                                  *      return code, or any return code that
 337                                  *      is not expected from authentication,
 338                                  *      is the same as an explicit REJECT!
 339                                  */
 340                                 case RLM_MODULE_FAIL:
 341                                 case RLM_MODULE_REJECT:
 342                                 case RLM_MODULE_USERLOCK:
 343                                 case RLM_MODULE_INVALID:
 344                                 case RLM_MODULE_NOTFOUND:
 345                                 case RLM_MODULE_NOOP:
 346                                 case RLM_MODULE_UPDATED:
 347                                         result = -1;
 348                                         break;
 349                                 case RLM_MODULE_OK:
 350                                         result = 0;
 351                                         break;
 352                                 case RLM_MODULE_HANDLED:
 353                                         result = 1;
 354                                         break;
 355                         }
 356                         break;
 357         }
 358
 359         return result;
 360 }
 361
 362 /*
 363  *      Process and reply to an authentication request
 364  *
 365  *      The return value of this function isn't actually used right now, so
 366  *      it's not entirely clear if it is returning the right things. --Pac.
 367  */
 368 int rad_authenticate(REQUEST *request)
 369 {
 370         VALUE_PAIR      *namepair;
 371         VALUE_PAIR      *check_item;
 372         VALUE_PAIR      *reply_item;
 373         VALUE_PAIR      *auth_item;
 374         VALUE_PAIR      *tmp;
 375         int             result, r;
 376         char            umsg[MAX_STRING_LEN + 1];
 377         const char      *user_msg = NULL;
 378         const char      *password;
 379         char            *exec_program;
 380         int             exec_wait;
 381         int             seen_callback_id;
 382         int             nas_port = 0;
 383         char            buf[1024], logstr[1024];
 384
 385         password = "";
 386
 387         /*
 388          *      Free any pre-existing configuration items.
 389          *
 390          *      This should ONLY be happening for proxy replies.
 391          */
 392         if ((request->proxy_reply) && (request->config_items)) {
 393                 pairfree(&request->config_items);
 394         }
 395
 396         /*
 397          *      If this request got proxied to another server,
 398          *      AND it was an authentication request, then we need
 399          *      to add an initial Auth-Type: Auth-Accept for success,
 400          *      Auth-Reject for fail. We also need to add the reply
 401          *      pairs from the server to the initial reply.
 402          */
 403         if ((request->proxy_reply) &&
 404             (request->packet->code == PW_AUTHENTICATION_REQUEST)) {
 405                 tmp = paircreate(PW_AUTHTYPE, PW_TYPE_INTEGER);
 406                 if (tmp == NULL) {
 407                         radlog(L_ERR|L_CONS, "no memory");
 408                         exit(1);
 409                 }
 410
 411                 /*
 412                  *      Reply of ACCEPT means accept, ALL other
 413                  *      replies mean reject.  This is fail-safe.
 414                  */
 415                 if (request->proxy_reply->code == PW_AUTHENTICATION_ACK)
 416                         tmp->lvalue = PW_AUTHTYPE_ACCEPT;
 417                 else
 418                         tmp->lvalue = PW_AUTHTYPE_REJECT;
 419                 pairadd(&request->config_items, tmp);
 420
 421                 /*
 422                  *      Initialize our reply to the user, by taking
 423                  *      the reply attributes from the proxy.
 424                  */
 425                 if (request->proxy_reply->vps) {
 426                         request->reply->vps = request->proxy_reply->vps;
 427                         request->proxy_reply->vps = NULL;
 428                 }
 429
 430                 /*
 431                  *      If it's an Access-Reject, then do NOT do any
 432                  *      authorization or authentication.  They're being
 433                  *      rejected, so we minimize the amount of work
 434                  *      done by the server, by rejecting them here.
 435                  */
 436                 if (request->proxy_reply->code != PW_AUTHENTICATION_ACK) {
 437                         request->reply->code = PW_AUTHENTICATION_REJECT;
 438                         return RLM_MODULE_REJECT;
 439                 }
 440         }
 441
 442         /*
 443          *      Get the username from the request.
 444          *
 445          *      Note that namepair MAY be NULL, in which case there
 446          *      is no User-Name attribute in the request.
 447          */
 448         namepair = request->username;
 449
 450         /*
 451          *      Discover which password we want to use.
 452          */
 453         if ((auth_item = rad_getpass(request)) != NULL) {
 454                 password = (const char *)auth_item->strvalue;
 455         }
 456
 457         /*
 458          *      Maybe there's a CHAP-Password?
 459          */
 460         if (auth_item == NULL) {
 461                 if ((auth_item = pairfind(request->packet->vps,
 462                                           PW_CHAP_PASSWORD)) != NULL) {
 463                         password = "<CHAP-PASSWORD>";
 464
 465                 } else {
 466                         /*
 467                          *      No password we recognize.
 468                          */
 469                         password = "<NO-PASSWORD>";
 470                 }
 471         }
 472         request->password = auth_item;
 473
 474         /*
 475          *      Get the user's authorization information from the database
 476          */
 477         r = module_authorize(request);
 478         if (r != RLM_MODULE_NOTFOUND &&
 479             r != RLM_MODULE_NOOP &&
 480             r != RLM_MODULE_OK &&
 481             r != RLM_MODULE_UPDATED) {
 482                 if (r != RLM_MODULE_FAIL && r != RLM_MODULE_HANDLED) {
 483                         rad_authlog("Invalid user", request, 0);
 484                         request->reply->code = PW_AUTHENTICATION_REJECT;
 485                 }
 486                 pairfree(&request->reply->vps);
 487                 request->reply->vps = NULL;
 488                 return r;
 489         }
 490
 491         /*
 492          *      If we haven't already proxied the packet, then check
 493          *      to see if we should.  Maybe one of the authorize
 494          *      modules has decided that a proxy should be used. If
 495          *      so, get out of here and send the packet.
 496          */
 497         if ((request->proxy == NULL) &&
 498             (pairfind(request->config_items, PW_PROXY_TO_REALM) != NULL)) {
 499                 return RLM_MODULE_OK;
 500         }
 501
 502         /*
 503          *      Perhaps there is a Stripped-User-Name now.
 504          */
 505         namepair = request->username;
 506
 507         /*
 508          *      Validate the user
 509          */
 510         do {
 511                 if ((result = check_expiration(request)) < 0)
 512                                 break;
 513                 result = rad_check_password(request);
 514                 if (result > 0) {
 515                         /* don't reply! */
 516                         return RLM_MODULE_HANDLED;
 517                 }
 518         } while(0);
 519
 520         /*
 521          *      Failed to validate the user.
 522          *
 523          *      We PRESUME that the code which failed will clean up
 524          *      request->reply->vps, to be ONLY the reply items it
 525          *      wants to send back.
 526          */
 527         if (result < 0) {
 528
 529                 DEBUG2("  auth: Failed to validate the user.");
 530                 request->reply->code = PW_AUTHENTICATION_REJECT;
 531
 532                 rad_authlog("Login incorrect", request, 0);
 533
 534                 /* double check: maybe the secret is wrong? */
 535                 if (debug_flag > 1) {
 536                         u_char *p;
 537
 538                   p = auth_item->strvalue;
 539                   while (*p) {
 540                     if (!isprint(*p)) {
 541                       log_debug("  WARNING: Unprintable characters in the password.\n           Double-check the shared secret on the server and the NAS!");
 542                       break;
 543                     }
 544                     p++;
 545                   }
 546                 }
 547         }
 548
 549         if (result >= 0 &&
 550            (check_item = pairfind(request->config_items, PW_SIMULTANEOUS_USE)) != NULL) {
 551                 /*
 552                  *      User authenticated O.K. Now we have to check
 553                  *      for the Simultaneous-Use parameter.
 554                  */
 555                 if (namepair &&
 556                     (r = radutmp_checksimul((char *)namepair->strvalue,
 557                     request->packet->vps, check_item->lvalue)) != 0) {
 558
 559                         if (check_item->lvalue > 1) {
 560                                 sprintf(umsg,
 561                 "\r\nYou are already logged in %d times  - access denied\r\n\n",
 562                                         (int)check_item->lvalue);
 563                                 user_msg = umsg;
 564                         } else {
 565                                 user_msg =
 566                 "\r\nYou are already logged in - access denied\r\n\n";
 567                         }
 568
 569                         request->reply->code = PW_AUTHENTICATION_REJECT;
 570
 571                         /*
 572                          *      They're trying to log in too many times.
 573                          *      Remove ALL reply attributes.
 574                          */
 575                         pairfree(&request->reply->vps);
 576                         tmp = pairmake("Reply-Message", user_msg, T_OP_SET);
 577                         request->reply->vps = tmp;
 578
 579                         strcpy(logstr, "Multiple logins");
 580                         sprintf(logstr, "%s (max %d) %s", logstr, check_item->lvalue,
 581                                                                 r == 2 ? "[MPP attempt]" : "");
 582                         rad_authlog(logstr, request, 1);
 583
 584                         result = -1;
 585                 }
 586         }
 587
 588         if (result >= 0 &&
 589            (check_item = pairfind(request->config_items, PW_LOGIN_TIME)) != NULL) {
 590
 591                 /*
 592                  *      Authentication is OK. Now see if this
 593                  *      user may login at this time of the day.
 594                  */
 595                 r = timestr_match((char *)check_item->strvalue,
 596                                   request->timestamp);
 597                 /*
 598                  *      Session-Timeout needs to be at least
 599                  *      60 seconds, some terminal servers
 600                  *      ignore smaller values.
 601                  */
 602                 if (r < 60) {
 603                         /*
 604                          *      User called outside allowed time interval.
 605                          */
 606                         result = -1;
 607                         user_msg =
 608                         "You are calling outside your allowed timespan\r\n";
 609
 610                         request->reply->code = PW_AUTHENTICATION_REJECT;
 611                         pairfree(&request->reply->vps);
 612
 613                         tmp = pairmake("Reply-Message", user_msg, T_OP_SET);
 614                         request->reply->vps = tmp;
 615
 616                         strcpy(logstr, "Outside allowed timespan");
 617                         sprintf(logstr, "%s (time allowed %s)", logstr,
 618                                                                                         check_item->strvalue);
 619                         rad_authlog(logstr, request, 1);
 620
 621                 } else if (r > 0) {
 622
 623                         /*
 624                          *      User is allowed, but set Session-Timeout.
 625                          */
 626                         if ((reply_item = pairfind(request->reply->vps,
 627                             PW_SESSION_TIMEOUT)) != NULL) {
 628                                 if (reply_item->lvalue > (unsigned) r)
 629                                         reply_item->lvalue = r;
 630                         } else {
 631                                 if ((reply_item = paircreate(
 632                                     PW_SESSION_TIMEOUT,
 633                                     PW_TYPE_INTEGER)) == NULL) {
 634                                         radlog(L_ERR|L_CONS, "no memory");
 635                                         exit(1);
 636                                 }
 637                                 reply_item->lvalue = r;
 638                                 pairadd(&request->reply->vps, reply_item);
 639                         }
 640                 }
 641         }
 642
 643         /*
 644          *      Result should be >= 0 here - if not, we return.
 645          */
 646         if (result < 0) {
 647                 return RLM_MODULE_OK;
 648         }
 649
 650         /*
 651          *      We might need this later.  The 'password' string
 652          *      is NOT used anywhere below here, except for logging,
 653          *      so it should be safe...
 654          */
 655         if (auth_item->attribute == PW_CHAP_PASSWORD) {
 656                 password = "CHAP-Password";
 657         }
 658
 659         /*
 660          *      Add the port number to the Framed-IP-Address if
 661          *      vp->addport is set, or if the Add-Port-To-IP-Address
 662          *      pair is present.
 663          *
 664          *      FIXME:  This doesn't work because PW_ADD_PORT_TO_IP_ADDRESS
 665          *      is never added to the request pairs!
 666          */
 667         if ((tmp = pairfind(request->reply->vps,
 668                         PW_FRAMED_IP_ADDRESS)) != NULL) {
 669                 VALUE_PAIR *tmp2;
 670
 671                 /*
 672                  *  Find the NAS port ID.
 673                  */
 674                 if ((tmp = pairfind(request->packet->vps,
 675                                     PW_NAS_PORT_ID)) != NULL)
 676                         nas_port = tmp->lvalue;
 677
 678                 if((tmp2 = pairfind(request->reply->vps,
 679                                     PW_ADD_PORT_TO_IP_ADDRESS)) != NULL) {
 680                         if (tmp->addport || (tmp2 && tmp2->lvalue)) {
 681                                 tmp->lvalue = htonl(ntohl(tmp->lvalue) + nas_port);
 682                                 tmp->addport = 0;
 683                         }
 684                         pairdelete(&request->reply->vps,
 685                                    PW_ADD_PORT_TO_IP_ADDRESS);
 686                 }
 687         }
 688
 689         /*
 690          *      See if we need to execute a program.
 691          *      FIXME: somehow cache this info, and only execute the
 692          *      program when we receive an Accounting-START packet.
 693          *      Only at that time we know dynamic IP etc.
 694          */
 695         exec_program = NULL;
 696         exec_wait = 0;
 697         if ((auth_item = pairfind(request->reply->vps, PW_EXEC_PROGRAM)) != NULL) {
 698                 exec_wait = 0;
 699                 exec_program = strdup((char *)auth_item->strvalue);
 700                 pairdelete(&request->reply->vps, PW_EXEC_PROGRAM);
 701         }
 702         if ((auth_item = pairfind(request->reply->vps, PW_EXEC_PROGRAM_WAIT)) != NULL) {
 703                 exec_wait = 1;
 704                 exec_program = strdup((char *)auth_item->strvalue);
 705                 pairdelete(&request->reply->vps, PW_EXEC_PROGRAM_WAIT);
 706         }
 707
 708         /*
 709          *      Hack - allow % expansion in certain value strings.
 710          *      This is nice for certain Exec-Program programs.
 711          */
 712         seen_callback_id = 0;
 713         if ((auth_item = pairfind(request->reply->vps, PW_CALLBACK_ID)) != NULL) {
 714                 seen_callback_id = 1;
 715                 radius_xlat2(buf, sizeof(auth_item->strvalue),
 716                              (char *)auth_item->strvalue, request);
 717                 strNcpy((char *)auth_item->strvalue, buf,
 718                         sizeof(auth_item->strvalue));
 719                 auth_item->length = strlen((char *)auth_item->strvalue);
 720         }
 721
 722
 723         /*
 724          *      If we want to exec a program, but wait for it,
 725          *      do it first before sending the reply.
 726          */
 727         if (exec_program && exec_wait) {
 728                 if (radius_exec_program(exec_program, request,
 729                     exec_wait, &user_msg) != 0) {
 730                         /*
 731                          *      Error. radius_exec_program() returns -1 on
 732                          *      fork/exec errors, or >0 if the exec'ed program
 733                          *      had a non-zero exit status.
 734                          */
 735                         if (user_msg == NULL)
 736                 user_msg = "\r\nAccess denied (external check failed).";
 737
 738                         request->reply->code = PW_AUTHENTICATION_REJECT;
 739                         pairfree(&request->reply->vps);
 740                         tmp = pairmake("Reply-Message", user_msg, T_OP_SET);
 741                         request->reply->vps = tmp;
 742
 743                         rad_authlog("Login incorrect (external check failed)",
 744                                                                         request, 0);
 745
 746                         return RLM_MODULE_OK;
 747                 }
 748         }
 749
 750         /*
 751          *      Delete "normal" A/V pairs when using callback.
 752          *
 753          *      FIXME: This is stupid. The portmaster should accept
 754          *      these settings instead of insisting on using a
 755          *      dialout location.
 756          *
 757          *      FIXME2: Move this into the above exec thingy?
 758          *      (if you knew how I use the exec_wait, you'd understand).
 759          */
 760         if (seen_callback_id) {
 761                 pairdelete(&request->reply->vps, PW_FRAMED_PROTOCOL);
 762                 pairdelete(&request->reply->vps, PW_FRAMED_IP_ADDRESS);
 763                 pairdelete(&request->reply->vps, PW_FRAMED_IP_NETMASK);
 764                 pairdelete(&request->reply->vps, PW_FRAMED_ROUTE);
 765                 pairdelete(&request->reply->vps, PW_FRAMED_MTU);
 766                 pairdelete(&request->reply->vps, PW_FRAMED_COMPRESSION);
 767                 pairdelete(&request->reply->vps, PW_FILTER_ID);
 768                 pairdelete(&request->reply->vps, PW_PORT_LIMIT);
 769                 pairdelete(&request->reply->vps, PW_CALLBACK_NUMBER);
 770         }
 771
 772         /*
 773          *      Filter (possibly multiple) Reply-Message attributes
 774          *      through radius_xlat2, modifying them in place.
 775          */
 776         if (user_msg == NULL) {
 777           reply_item = pairfind(request->reply->vps, PW_REPLY_MESSAGE);
 778           while (reply_item) {
 779                 radius_xlat2(buf, sizeof(reply_item->strvalue),
 780                              (char *)reply_item->strvalue, request);
 781                 strNcpy((char *)reply_item->strvalue, buf,
 782                         sizeof(reply_item->strvalue));
 783                 reply_item->length = strlen((char *)reply_item->strvalue);
 784                 user_msg = NULL;
 785                 reply_item = pairfind(reply_item->next, PW_REPLY_MESSAGE);
 786           }
 787         }
 788
 789         request->reply->code = PW_AUTHENTICATION_ACK;
 790
 791         rad_authlog("Login OK", request, 1);
 792         if (exec_program && !exec_wait) {
 793                 /*
 794                  *      No need to check the exit status here.
 795                  */
 796                 radius_exec_program(exec_program, request, exec_wait, NULL);
 797         }
 798
 799         if (exec_program) free(exec_program);
 800         return RLM_MODULE_OK;
 801 }
 802
 803
 804 /*
 805  *      These definitions are local, and shouldn't be used by anyone else.
 806  */
 807 #define PW_ENCODED      0
 808 #define PW_DECODED      1
 809
 810 /*
 811  * Find the password pair, decode pass if
 812  * needed, and return the value pair.  If
 813  * not found, return NULL
 814  */
 815 VALUE_PAIR *rad_getpass(REQUEST *request) {
 816         VALUE_PAIR *auth_item;
 817
 818         /*
 819          *      First, look up the password in the request header.
 820          */
 821         auth_item = request->password;
 822         if (auth_item) {
 823                 /*
 824                  *      It's there, but it's not a clear-text password.
 825                  *      Give up.
 826                  */
 827                 if (auth_item->attribute != PW_PASSWORD) {
 828                         return NULL;
 829                 }
 830         } else {
 831                 /*
 832                  *      Go find the request password.
 833                  */
 834                 auth_item = pairfind(request->packet->vps, PW_PASSWORD);
 835                 if (!auth_item) {
 836                         return NULL;
 837                 }
 838
 839                 /*
 840                  *      Save the found password for later.
 841                  */
 842                 request->password = auth_item;
 843         }
 844
 845
 846         /*
 847          *      If we proxied already, it's been decoded
 848          *      Or if the decoded flag is set...just return
 849          */
 850         if ((request->proxy != NULL) ||
 851             (auth_item->lvalue == PW_DECODED)) {
 852                 return auth_item;
 853         }
 854
 855         /*
 856          *      If we get here, we have to decode the password.
 857          */
 858         rad_pwdecode((char *)auth_item->strvalue,
 859                      auth_item->length, request->secret,
 860                      (char *)request->packet->vector);
 861
 862         /*
 863          *      Set lvalue to PW_DECODED so we know not to
 864          *      decode next time we get here
 865          */
 866         auth_item->lvalue = PW_DECODED;
 867
 868         /* ignore more than one trailing '\0' */
 869         auth_item->length = strlen(auth_item->strvalue);
 870
 871         return auth_item;
 872 }
 873