src/modules/rlm_pap/rlm_pap.c

   1 /*
   2  * rlm_pap.c
   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 2001,2006  The FreeRADIUS server project
  21  * Copyright 2001  Kostas Kalevras <kkalev@noc.ntua.gr>
  22  */
  23
  24 #include <freeradius-devel/ident.h>
  25 RCSID("$Id$")
  26
  27 #include <freeradius-devel/autoconf.h>
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33 #include <ctype.h>
  34
  35 #include <freeradius-devel/radiusd.h>
  36 #include <freeradius-devel/modules.h>
  37 #include "../../include/md5.h"
  38 #include "../../include/sha1.h"
  39
  40 #define PAP_ENC_INVALID -1
  41 #define PAP_ENC_CLEAR           0
  42 #define PAP_ENC_CRYPT           1
  43 #define PAP_ENC_MD5             2
  44 #define PAP_ENC_SHA1            3
  45 #define PAP_ENC_NT              4
  46 #define PAP_ENC_LM              5
  47 #define PAP_ENC_SMD5            6
  48 #define PAP_ENC_SSHA            7
  49 #define PAP_ENC_NS_MTA_MD5      8
  50 #define PAP_ENC_AUTO            9
  51 #define PAP_MAX_ENC             9
  52
  53
  54 /*
  55  *      Define a structure for our module configuration.
  56  *
  57  *      These variables do not need to be in a structure, but it's
  58  *      a lot cleaner to do so, and a pointer to the structure can
  59  *      be used as the instance handle.
  60  */
  61 typedef struct rlm_pap_t {
  62         const char *name;       /* CONF_SECTION->name, not strdup'd */
  63         char *scheme;  /* password encryption scheme */
  64         int sch;
  65         char norm_passwd;
  66         int auto_header;
  67 } rlm_pap_t;
  68
  69 /*
  70  *      A mapping of configuration file names to internal variables.
  71  *
  72  *      Note that the string is dynamically allocated, so it MUST
  73  *      be freed.  When the configuration file parse re-reads the string,
  74  *      it free's the old one, and strdup's the new one, placing the pointer
  75  *      to the strdup'd string into 'config.string'.  This gets around
  76  *      buffer over-flows.
  77  */
  78 static const CONF_PARSER module_config[] = {
  79         { "encryption_scheme", PW_TYPE_STRING_PTR, offsetof(rlm_pap_t,scheme), NULL, "auto" },
  80         { "auto_header", PW_TYPE_BOOLEAN, offsetof(rlm_pap_t,auto_header), NULL, "no" },
  81         { NULL, -1, 0, NULL, NULL }
  82 };
  83
  84 static const LRAD_NAME_NUMBER schemes[] = {
  85         { "clear", PAP_ENC_CLEAR },
  86         { "crypt", PAP_ENC_CRYPT },
  87         { "md5", PAP_ENC_MD5 },
  88         { "sha1", PAP_ENC_SHA1 },
  89         { "nt", PAP_ENC_NT },
  90         { "lm", PAP_ENC_LM },
  91         { "smd5", PAP_ENC_SMD5 },
  92         { "ssha", PAP_ENC_SSHA },
  93         { "auto", PAP_ENC_AUTO },
  94         { NULL, PAP_ENC_INVALID }
  95 };
  96
  97
  98 /*
  99  *      For auto-header discovery.
 100  */
 101 static const LRAD_NAME_NUMBER header_names[] = {
 102         { "{clear}",    PW_CLEARTEXT_PASSWORD },
 103         { "{cleartext}", PW_CLEARTEXT_PASSWORD },
 104         { "{md5}",      PW_MD5_PASSWORD },
 105         { "{smd5}",     PW_SMD5_PASSWORD },
 106         { "{crypt}",    PW_CRYPT_PASSWORD },
 107         { "{sha}",      PW_SHA_PASSWORD },
 108         { "{ssha}",     PW_SSHA_PASSWORD },
 109         { "{nt}",       PW_NT_PASSWORD },
 110         { "{x-nthash}", PW_NT_PASSWORD },
 111         { "{ns-mta-md5}", PW_NS_MTA_MD5_PASSWORD },
 112         { NULL, 0 }
 113 };
 114
 115
 116 static int pap_detach(void *instance)
 117 {
 118         rlm_pap_t *inst = (rlm_pap_t *) instance;
 119
 120         free((char *)inst->scheme);
 121         free(inst);
 122
 123         return 0;
 124 }
 125
 126
 127 static int pap_instantiate(CONF_SECTION *conf, void **instance)
 128 {
 129         rlm_pap_t *inst;
 130
 131         /*
 132          *      Set up a storage area for instance data
 133          */
 134         inst = rad_malloc(sizeof(*inst));
 135         if (!inst) {
 136                 return -1;
 137         }
 138         memset(inst, 0, sizeof(*inst));
 139
 140         /*
 141          *      If the configuration parameters can't be parsed, then
 142          *      fail.
 143          */
 144         if (cf_section_parse(conf, inst, module_config) < 0) {
 145                 pap_detach(inst);
 146                 return -1;
 147         }
 148         if (inst->scheme == NULL || strlen(inst->scheme) == 0){
 149                 radlog(L_ERR, "rlm_pap: No scheme defined");
 150                 pap_detach(inst);
 151                 return -1;
 152         }
 153
 154         inst->sch = lrad_str2int(schemes, inst->scheme, PAP_ENC_INVALID);
 155         if (inst->sch == PAP_ENC_INVALID) {
 156                 radlog(L_ERR, "rlm_pap: Unknown scheme \"%s\"", inst->scheme);
 157                 pap_detach(inst);
 158                 return -1;
 159         }
 160
 161         *instance = inst;
 162         inst->name = cf_section_name2(conf);
 163         if (!inst->name) {
 164                 inst->name = cf_section_name1(conf);
 165         }
 166
 167         return 0;
 168 }
 169
 170
 171 /*
 172  *      Decode one base64 chunk
 173  */
 174 static int decode_it(const char *src, uint8_t *dst)
 175 {
 176         int i;
 177         unsigned int x = 0;
 178
 179         for(i = 0; i < 4; i++) {
 180                 if (src[i] >= 'A' && src[i] <= 'Z')
 181                         x = (x << 6) + (unsigned int)(src[i] - 'A' + 0);
 182                 else if (src[i] >= 'a' && src[i] <= 'z')
 183                          x = (x << 6) + (unsigned int)(src[i] - 'a' + 26);
 184                 else if(src[i] >= '0' && src[i] <= '9')
 185                          x = (x << 6) + (unsigned int)(src[i] - '0' + 52);
 186                 else if(src[i] == '+')
 187                         x = (x << 6) + 62;
 188                 else if (src[i] == '/')
 189                         x = (x << 6) + 63;
 190                 else if (src[i] == '=')
 191                         x = (x << 6);
 192                 else return 0;
 193         }
 194
 195         dst[2] = (unsigned char)(x & 255); x >>= 8;
 196         dst[1] = (unsigned char)(x & 255); x >>= 8;
 197         dst[0] = (unsigned char)(x & 255); x >>= 8;
 198
 199         return 1;
 200 }
 201
 202
 203 /*
 204  *      Base64 decoding.
 205  */
 206 static int base64_decode (const char *src, uint8_t *dst)
 207 {
 208         int length, equals;
 209         int i, num;
 210         char last[3];
 211
 212         length = equals = 0;
 213         while (src[length] && src[length] != '=') length++;
 214
 215         if (src[length] != '=') return 0; /* no trailing '=' */
 216
 217         while (src[length + equals] == '=') equals++;
 218
 219         num = (length + equals) / 4;
 220
 221         for (i = 0; i < num - 1; i++) {
 222                 if (!decode_it(src, dst)) return 0;
 223                 src += 4;
 224                 dst += 3;
 225         }
 226
 227         decode_it(src, last);
 228         for (i = 0; i < (3 - equals); i++) {
 229                 dst[i] = last[i];
 230         }
 231
 232         return (num * 3) - equals;
 233 }
 234
 235
 236 /*
 237  *      Hex or base64 or bin auto-discovery.
 238  */
 239 static void normify(VALUE_PAIR *vp, int min_length)
 240 {
 241         int decoded;
 242         char buffer[64];
 243
 244         if ((size_t) min_length >= sizeof(buffer)) return; /* paranoia */
 245
 246         /*
 247          *      Hex encoding.
 248          */
 249         if (vp->length >= (2 * min_length)) {
 250                 decoded = lrad_hex2bin(vp->vp_octets, buffer, vp->length >> 1);
 251                 if (decoded == (vp->length >> 1)) {
 252                         DEBUG2("rlm_pap: Normalizing %s from hex encoding", vp->name);
 253                         memcpy(vp->vp_octets, buffer, decoded);
 254                         vp->length = decoded;
 255                         return;
 256                 }
 257         }
 258
 259         /*
 260          *      Base 64 encoding.  It's at least 4/3 the original size,
 261          *      and we want to avoid division...
 262          */
 263         if ((vp->length * 3) >= ((min_length * 4))) {
 264                 decoded = base64_decode(vp->vp_octets, buffer);
 265                 if (decoded >= min_length) {
 266                         DEBUG2("rlm_pap: Normalizing %s from base64 encoding", vp->name);
 267                         memcpy(vp->vp_octets, buffer, decoded);
 268                         vp->length = decoded;
 269                         return;
 270                 }
 271         }
 272
 273         /*
 274          *      Else unknown encoding, or already binary.  Leave it.
 275          */
 276 }
 277
 278
 279 /*
 280  *      Authorize the user for PAP authentication.
 281  *
 282  *      This isn't strictly necessary, but it does make the
 283  *      server simpler to configure.
 284  */
 285 static int pap_authorize(void *instance, REQUEST *request)
 286 {
 287         rlm_pap_t *inst = instance;
 288         int auth_type = FALSE;
 289         int found_pw = FALSE;
 290         VALUE_PAIR *vp;
 291
 292         for (vp = request->config_items; vp != NULL; vp = vp->next) {
 293                 switch (vp->attribute) {
 294                 case PW_USER_PASSWORD: /* deprecated */
 295                         found_pw = TRUE;
 296
 297                         /*
 298                          *      Look for '{foo}', and use them
 299                          */
 300                         if (!inst->auto_header ||
 301                             (vp->vp_strvalue[0] != '{')) {
 302                                 break;
 303                         }
 304                         /* FALL-THROUGH */
 305
 306                 case PW_PASSWORD_WITH_HEADER: /* preferred */
 307                 {
 308                         int attr;
 309                         uint8_t *p, *q;
 310                         char buffer[64];
 311                         VALUE_PAIR *new_vp;
 312
 313                         found_pw = TRUE;
 314                         q = vp->vp_strvalue;
 315                         p = strchr(q + 1, '}');
 316                         if (!p) {
 317                                 /*
 318                                  *      FIXME: Turn it into a
 319                                  *      cleartext-password, unless it,
 320                                  *      or user-password already
 321                                  *      exists.
 322                                  */
 323                                 break;
 324                         }
 325
 326                         if ((size_t) (p - q) > sizeof(buffer)) break;
 327
 328                         memcpy(buffer, q, p - q + 1);
 329                         buffer[p - q + 1] = '\0';
 330
 331                         attr = lrad_str2int(header_names, buffer, 0);
 332                         if (!attr) {
 333                                 DEBUG2("rlm_pap: Found unknown header {%s}: Not doing anything", buffer);
 334                                 break;
 335                         }
 336
 337                         new_vp = paircreate(attr, PW_TYPE_STRING);
 338                         if (!new_vp) break; /* OOM */
 339
 340                         strcpy(new_vp->vp_strvalue, p + 1);/* bounds OK */
 341                         new_vp->length = strlen(new_vp->vp_strvalue);
 342                         pairadd(&request->config_items, new_vp);
 343
 344                         /*
 345                          *      May be old-style User-Password with header.
 346                          *      We've found the header & created the proper
 347                          *      attribute, so we should delete the old
 348                          *      User-Password here.
 349                          */
 350                         pairdelete(&request->config_items, PW_USER_PASSWORD);
 351                 }
 352                         break;
 353
 354                 case PW_CLEARTEXT_PASSWORD:
 355                 case PW_CRYPT_PASSWORD:
 356                 case PW_NS_MTA_MD5_PASSWORD:
 357                         found_pw = TRUE;
 358                         break;  /* don't touch these */
 359
 360                 case PW_MD5_PASSWORD:
 361                 case PW_SMD5_PASSWORD:
 362                 case PW_NT_PASSWORD:
 363                 case PW_LM_PASSWORD:
 364                         normify(vp, 16); /* ensure it's in the right format */
 365                         found_pw = TRUE;
 366                         break;
 367
 368                 case PW_SHA_PASSWORD:
 369                 case PW_SSHA_PASSWORD:
 370                         normify(vp, 20); /* ensure it's in the right format */
 371                         found_pw = TRUE;
 372                         break;
 373
 374                         /*
 375                          *      If it's proxied somewhere, don't complain
 376                          *      about not having passwords or Auth-Type.
 377                          */
 378                 case PW_PROXY_TO_REALM:
 379                 {
 380                         REALM *realm = realm_find(vp->vp_strvalue, 0);
 381                         if (realm &&
 382                             (realm->ipaddr.af == AF_INET) &&
 383                             (realm->ipaddr.ipaddr.ip4addr.s_addr != htonl(INADDR_NONE))) {
 384                                 return RLM_MODULE_NOOP;
 385                         }
 386                         break;
 387                 }
 388
 389                 case PW_AUTH_TYPE:
 390                         auth_type = TRUE;
 391
 392                         /*
 393                          *      Auth-Type := Accept
 394                          *      Auth-Type := Reject
 395                          */
 396                         if ((vp->lvalue == 254) ||
 397                             (vp->lvalue == 4)) {
 398                             found_pw = 1;
 399                         }
 400                         break;
 401
 402                 default:
 403                         break;  /* ignore it */
 404
 405                 }
 406         }
 407
 408         /*
 409          *      Print helpful warnings if there was no password.
 410          */
 411         if (!found_pw) {
 412                 DEBUG("rlm_pap: WARNING! No \"known good\" password found for the user.  Authentication may fail because of this.");
 413                 return RLM_MODULE_NOOP;
 414         }
 415
 416         /*
 417          *      Don't touch existing Auth-Types.
 418          */
 419         if (auth_type) {
 420                 DEBUG2("rlm_pap: Found existing Auth-Type, not changing it.");
 421                 return RLM_MODULE_NOOP;
 422         }
 423
 424         /*
 425          *      Can't do PAP if there's no password.
 426          */
 427         if (!request->password ||
 428             (request->password->attribute != PW_USER_PASSWORD)) {
 429                 /*
 430                  *      Don't print out debugging messages if we know
 431                  *      they're useless.
 432                  */
 433                 if (request->packet->code == PW_ACCESS_CHALLENGE) {
 434                         return RLM_MODULE_NOOP;
 435                 }
 436
 437                 DEBUG2("rlm_pap: No clear-text password in the request.  Not performing PAP.");
 438                 return RLM_MODULE_NOOP;
 439         }
 440
 441         vp = paircreate(PW_AUTH_TYPE, PW_TYPE_INTEGER);
 442         if (!vp) return RLM_MODULE_FAIL;
 443         pairparsevalue(vp, inst->name);
 444
 445         pairadd(&request->config_items, vp);
 446
 447         return RLM_MODULE_UPDATED;
 448 }
 449
 450
 451 /*
 452  *      Authenticate the user via one of any well-known password.
 453  */
 454 static int pap_authenticate(void *instance, REQUEST *request)
 455 {
 456         rlm_pap_t *inst = instance;
 457         VALUE_PAIR *vp;
 458         VALUE_PAIR *module_fmsg_vp;
 459         char module_fmsg[MAX_STRING_LEN];
 460         MD5_CTX md5_context;
 461         SHA1_CTX sha1_context;
 462         uint8_t digest[40];
 463         char buff[MAX_STRING_LEN];
 464         char buff2[MAX_STRING_LEN + 50];
 465         int scheme = PAP_ENC_INVALID;
 466
 467         if (!request->password){
 468                 radlog(L_AUTH, "rlm_pap: Attribute \"Password\" is required for authentication.");
 469                 return RLM_MODULE_INVALID;
 470         }
 471
 472         /*
 473          *      Clear-text passwords are the only ones we support.
 474          */
 475         if (request->password->attribute != PW_USER_PASSWORD) {
 476                 radlog(L_AUTH, "rlm_pap: Attribute \"User-Password\" is required for authentication. Cannot use \"%s\".", request->password->name);
 477                 return RLM_MODULE_INVALID;
 478         }
 479
 480         /*
 481          *      The user MUST supply a non-zero-length password.
 482          */
 483         if (request->password->length == 0) {
 484                 snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: empty password supplied");
 485                 module_fmsg_vp = pairmake("Module-Failure-Message", module_fmsg, T_OP_EQ);
 486                 pairadd(&request->packet->vps, module_fmsg_vp);
 487                 return RLM_MODULE_INVALID;
 488         }
 489
 490         DEBUG("rlm_pap: login attempt with password %s",
 491               request->password->vp_strvalue);
 492
 493         /*
 494          *      First, auto-detect passwords, by attribute in the
 495          *      config items.
 496          */
 497         if (inst->sch == PAP_ENC_AUTO) {
 498                 for (vp = request->config_items; vp != NULL; vp = vp->next) {
 499                         switch (vp->attribute) {
 500                         case PW_USER_PASSWORD: /* deprecated */
 501                         case PW_CLEARTEXT_PASSWORD: /* preferred */
 502                                 goto do_clear;
 503
 504                         case PW_CRYPT_PASSWORD:
 505                                 goto do_crypt;
 506
 507                         case PW_MD5_PASSWORD:
 508                                 goto do_md5;
 509
 510                         case PW_SHA_PASSWORD:
 511                                 goto do_sha;
 512
 513                         case PW_NT_PASSWORD:
 514                                 goto do_nt;
 515
 516                         case PW_LM_PASSWORD:
 517                                 goto do_lm;
 518
 519                         case PW_SMD5_PASSWORD:
 520                                 goto do_smd5;
 521
 522                         case PW_SSHA_PASSWORD:
 523                                 goto do_ssha;
 524
 525                         case PW_NS_MTA_MD5_PASSWORD:
 526                                 goto do_ns_mta_md5;
 527
 528                         default:
 529                                 break;  /* ignore it */
 530
 531                         }
 532                 }
 533
 534         fail:
 535                 DEBUG("rlm_pap: No password configured for the user.  Cannot do authentication");
 536                 return RLM_MODULE_FAIL;
 537
 538         } else {
 539                 vp = NULL;
 540
 541                 if (inst->sch == PAP_ENC_CRYPT) {
 542                         vp = pairfind(request->config_items, PW_CRYPT_PASSWORD);
 543                 }
 544
 545                 /*
 546                  *      Old-style: all passwords are in User-Password.
 547                  */
 548                 if (!vp) {
 549                         vp = pairfind(request->config_items, PW_USER_PASSWORD);
 550                         if (!vp) goto fail;
 551                 }
 552         }
 553
 554         /*
 555          *      Now that we've decided what to do, go do it.
 556          */
 557         switch (scheme) {
 558         case PAP_ENC_CLEAR:
 559         do_clear:
 560                 DEBUG("rlm_pap: Using clear text password.");
 561                 if (strcmp((char *) vp->vp_strvalue,
 562                            (char *) request->password->vp_strvalue) != 0){
 563                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: CLEAR TEXT password check failed");
 564                         goto make_msg;
 565                 }
 566         done:
 567                 DEBUG("rlm_pap: User authenticated succesfully");
 568                 return RLM_MODULE_OK;
 569                 break;
 570
 571         case PAP_ENC_CRYPT:
 572         do_crypt:
 573                 DEBUG("rlm_pap: Using CRYPT encryption.");
 574                 if (lrad_crypt_check((char *) request->password->vp_strvalue,
 575                                      (char *) vp->vp_strvalue) != 0) {
 576                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: CRYPT password check failed");
 577                         goto make_msg;
 578                 }
 579                 goto done;
 580                 break;
 581
 582         case PW_MD5_PASSWORD:
 583         do_md5:
 584                 DEBUG("rlm_pap: Using MD5 encryption.");
 585
 586                 normify(vp, 16);
 587                 if (vp->length != 16) {
 588                 DEBUG("rlm_pap: Configured MD5 password has incorrect length");
 589                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured MD5 password has incorrect length");
 590                         goto make_msg;
 591                 }
 592
 593                 MD5Init(&md5_context);
 594                 MD5Update(&md5_context, request->password->vp_strvalue,
 595                           request->password->length);
 596                 MD5Final(digest, &md5_context);
 597                 if (memcmp(digest, vp->vp_octets, vp->length) != 0) {
 598                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: MD5 password check failed");
 599                         goto make_msg;
 600                 }
 601                 goto done;
 602                 break;
 603
 604         case PW_SMD5_PASSWORD:
 605         do_smd5:
 606                 DEBUG("rlm_pap: Using SMD5 encryption.");
 607
 608                 normify(vp, 16);
 609                 if (vp->length <= 16) {
 610                         DEBUG("rlm_pap: Configured SMD5 password has incorrect length");
 611                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured SMD5 password has incorrect length");
 612                         goto make_msg;
 613                 }
 614
 615                 MD5Init(&md5_context);
 616                 MD5Update(&md5_context, request->password->vp_strvalue,
 617                           request->password->length);
 618                 MD5Update(&md5_context, &vp->vp_octets[16], vp->length - 16);
 619                 MD5Final(digest, &md5_context);
 620
 621                 /*
 622                  *      Compare only the MD5 hash results, not the salt.
 623                  */
 624                 if (memcmp(digest, vp->vp_octets, 16) != 0) {
 625                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: SMD5 password check failed");
 626                         goto make_msg;
 627                 }
 628                 goto done;
 629                 break;
 630
 631         case PW_SHA_PASSWORD:
 632         do_sha:
 633                 DEBUG("rlm_pap: Using SHA1 encryption.");
 634
 635                 normify(vp, 20);
 636                 if (vp->length != 20) {
 637                         DEBUG("rlm_pap: Configured SHA1 password has incorrect length");
 638                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured SHA1 password has incorrect length");
 639                         goto make_msg;
 640                 }
 641
 642                 SHA1Init(&sha1_context);
 643                 SHA1Update(&sha1_context, request->password->vp_strvalue,
 644                            request->password->length);
 645                 SHA1Final(digest,&sha1_context);
 646                 if (memcmp(digest, vp->vp_octets, vp->length) != 0) {
 647                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: SHA1 password check failed");
 648                         goto make_msg;
 649                 }
 650                 goto done;
 651                 break;
 652
 653         case PW_SSHA_PASSWORD:
 654         do_ssha:
 655                 DEBUG("rlm_pap: Using SSHA encryption.");
 656
 657                 normify(vp, 20);
 658                 if (vp->length <= 20) {
 659                         DEBUG("rlm_pap: Configured SSHA password has incorrect length");
 660                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured SHA password has incorrect length");
 661                         goto make_msg;
 662                 }
 663
 664
 665                 SHA1Init(&sha1_context);
 666                 SHA1Update(&sha1_context, request->password->vp_strvalue,
 667                            request->password->length);
 668                 SHA1Update(&sha1_context, &vp->vp_octets[20], vp->length - 20);
 669                 SHA1Final(digest,&sha1_context);
 670                 if (memcmp(digest, vp->vp_octets, 20) != 0) {
 671                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: SSHA password check failed");
 672                         goto make_msg;
 673                 }
 674                 goto done;
 675                 break;
 676
 677         case PW_NT_PASSWORD:
 678         do_nt:
 679                 DEBUG("rlm_pap: Using NT encryption.");
 680
 681                 normify(vp, 16);
 682                 if (vp->length != 16) {
 683                         DEBUG("rlm_pap: Configured NT-Password has incorrect length");
 684                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured NT-Password has incorrect length");
 685                         goto make_msg;
 686                 }
 687
 688                 sprintf(buff2,"%%{mschap:NT-Hash %s}",
 689                         request->password->vp_strvalue);
 690                 if (!radius_xlat(digest,sizeof(digest),buff2,request,NULL)){
 691                         DEBUG("rlm_pap: mschap xlat failed");
 692                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: mschap xlat failed");
 693                         goto make_msg;
 694                 }
 695                 if ((lrad_hex2bin(digest, digest, 16) != vp->length) ||
 696                     (memcmp(digest, vp->vp_octets, vp->length) != 0)) {
 697                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: NT password check failed");
 698                         goto make_msg;
 699                 }
 700                 goto done;
 701                 break;
 702
 703         case PW_LM_PASSWORD:
 704         do_lm:
 705                 DEBUG("rlm_pap: Using LM encryption.");
 706
 707                 normify(vp, 16);
 708                 if (vp->length != 16) {
 709                         DEBUG("rlm_pap: Configured LM-Password has incorrect length");
 710                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured LM-Password has incorrect length");
 711                         goto make_msg;
 712                 }
 713                 sprintf(buff2,"%%{mschap:LM-Hash %s}",
 714                         request->password->vp_strvalue);
 715                 if (!radius_xlat(digest,sizeof(digest),buff2,request,NULL)){
 716                         DEBUG("rlm_pap: mschap xlat failed");
 717                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: mschap xlat failed");
 718                         goto make_msg;
 719                 }
 720                 if ((lrad_hex2bin(digest, digest, 16) != vp->length) ||
 721                     (memcmp(digest, vp->vp_octets, vp->length) != 0)) {
 722                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: LM password check failed");
 723                 make_msg:
 724                         DEBUG("rlm_pap: Passwords don't match");
 725                         module_fmsg_vp = pairmake("Module-Failure-Message",
 726                                                   module_fmsg, T_OP_EQ);
 727                         pairadd(&request->packet->vps, module_fmsg_vp);
 728                         return RLM_MODULE_REJECT;
 729                 }
 730                 goto done;
 731                 break;
 732
 733         case PAP_ENC_NS_MTA_MD5:
 734         do_ns_mta_md5:
 735                 DEBUG("rlm_pap: Using NT-MTA-MD5 password");
 736
 737                 if (vp->length != 64) {
 738                         DEBUG("rlm_pap: Configured NS-MTA-MD5-Password has incorrect length");
 739                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured NS-MTA-MD5-Password has incorrect length");
 740                         goto make_msg;
 741                 }
 742
 743                 /*
 744                  *      Sanity check the value of NS-MTA-MD5-Password
 745                  */
 746                 if (lrad_hex2bin(vp->vp_octets, buff, 32) != 16) {
 747                         DEBUG("rlm_pap: Configured NS-MTA-MD5-Password has invalid value");
 748                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured NS-MTA-MD5-Password has invalid value");
 749                         goto make_msg;
 750                 }
 751
 752                 /*
 753                  *      Ensure we don't have buffer overflows.
 754                  *
 755                  *      This really: sizeof(buff) - 2 - 2*32 - strlen(passwd)
 756                  */
 757                 if (strlen(request->password->vp_strvalue) >= (sizeof(buff2) - 2 - 2 * 32)) {
 758                         DEBUG("rlm_pap: Configured password is too long");
 759                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: password is too long");
 760                         goto make_msg;
 761                 }
 762
 763                 /*
 764                  *      Set up the algorithm.
 765                  */
 766                 {
 767                         char *p = buff2;
 768
 769                         memcpy(p, &vp->vp_octets[32], 32);
 770                         p += 32;
 771                         *(p++) = 89;
 772                         strcpy(p, request->password->vp_strvalue);
 773                         p += strlen(p);
 774                         *(p++) = 247;
 775                         memcpy(p, &vp->vp_octets[32], 32);
 776                         p += 32;
 777
 778                         MD5Init(&md5_context);
 779                         MD5Update(&md5_context, buff2, p - buff2);
 780                         MD5Final(digest, &md5_context);
 781                 }
 782                 if (memcmp(digest, buff, 16) != 0) {
 783                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: NS-MTA-MD5 password check failed");
 784                         goto make_msg;
 785                 }
 786                 goto done;
 787
 788         default:
 789                 break;
 790         }
 791
 792         DEBUG("rlm_pap: No password configured for the user.  Cannot do authentication");
 793         return RLM_MODULE_FAIL;
 794 }
 795
 796
 797 /*
 798  *      The module name should be the only globally exported symbol.
 799  *      That is, everything else should be 'static'.
 800  *
 801  *      If the module needs to temporarily modify it's instantiation
 802  *      data, the type should be changed to RLM_TYPE_THREAD_UNSAFE.
 803  *      The server will then take care of ensuring that the module
 804  *      is single-threaded.
 805  */
 806 module_t rlm_pap = {
 807         RLM_MODULE_INIT,
 808         "PAP",
 809         0,                              /* type */
 810         pap_instantiate,                /* instantiation */
 811         pap_detach,                     /* detach */
 812         {
 813                 pap_authenticate,       /* authentication */
 814                 pap_authorize,          /* authorization */
 815                 NULL,                   /* preaccounting */
 816                 NULL,                   /* accounting */
 817                 NULL,                   /* checksimul */
 818                 NULL,                   /* pre-proxy */
 819                 NULL,                   /* post-proxy */
 820                 NULL                    /* post-auth */
 821         },
 822 };