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/radiusd.h>
  28 #include <freeradius-devel/modules.h>
  29
  30 #include <ctype.h>
  31
  32 #include "../../include/md5.h"
  33 #include "../../include/sha1.h"
  34
  35 #define PAP_ENC_INVALID -1
  36 #define PAP_ENC_CLEAR           0
  37 #define PAP_ENC_CRYPT           1
  38 #define PAP_ENC_MD5             2
  39 #define PAP_ENC_SHA1            3
  40 #define PAP_ENC_NT              4
  41 #define PAP_ENC_LM              5
  42 #define PAP_ENC_SMD5            6
  43 #define PAP_ENC_SSHA            7
  44 #define PAP_ENC_NS_MTA_MD5      8
  45 #define PAP_ENC_AUTO            9
  46 #define PAP_MAX_ENC             9
  47
  48
  49 /*
  50  *      Define a structure for our module configuration.
  51  *
  52  *      These variables do not need to be in a structure, but it's
  53  *      a lot cleaner to do so, and a pointer to the structure can
  54  *      be used as the instance handle.
  55  */
  56 typedef struct rlm_pap_t {
  57         const char *name;       /* CONF_SECTION->name, not strdup'd */
  58         char *scheme;  /* password encryption scheme */
  59         int sch;
  60         char norm_passwd;
  61         int auto_header;
  62         int auth_type;
  63 } rlm_pap_t;
  64
  65 /*
  66  *      A mapping of configuration file names to internal variables.
  67  *
  68  *      Note that the string is dynamically allocated, so it MUST
  69  *      be freed.  When the configuration file parse re-reads the string,
  70  *      it free's the old one, and strdup's the new one, placing the pointer
  71  *      to the strdup'd string into 'config.string'.  This gets around
  72  *      buffer over-flows.
  73  */
  74 static const CONF_PARSER module_config[] = {
  75         { "encryption_scheme", PW_TYPE_STRING_PTR, offsetof(rlm_pap_t,scheme), NULL, "auto" },
  76         { "auto_header", PW_TYPE_BOOLEAN, offsetof(rlm_pap_t,auto_header), NULL, "no" },
  77         { NULL, -1, 0, NULL, NULL }
  78 };
  79
  80 static const FR_NAME_NUMBER schemes[] = {
  81         { "clear", PAP_ENC_CLEAR },
  82         { "crypt", PAP_ENC_CRYPT },
  83         { "md5", PAP_ENC_MD5 },
  84         { "sha1", PAP_ENC_SHA1 },
  85         { "nt", PAP_ENC_NT },
  86         { "lm", PAP_ENC_LM },
  87         { "smd5", PAP_ENC_SMD5 },
  88         { "ssha", PAP_ENC_SSHA },
  89         { "auto", PAP_ENC_AUTO },
  90         { NULL, PAP_ENC_INVALID }
  91 };
  92
  93
  94 /*
  95  *      For auto-header discovery.
  96  */
  97 static const FR_NAME_NUMBER header_names[] = {
  98         { "{clear}",    PW_CLEARTEXT_PASSWORD },
  99         { "{cleartext}", PW_CLEARTEXT_PASSWORD },
 100         { "{md5}",      PW_MD5_PASSWORD },
 101         { "{smd5}",     PW_SMD5_PASSWORD },
 102         { "{crypt}",    PW_CRYPT_PASSWORD },
 103         { "{sha}",      PW_SHA_PASSWORD },
 104         { "{ssha}",     PW_SSHA_PASSWORD },
 105         { "{nt}",       PW_NT_PASSWORD },
 106         { "{x-nthash}", PW_NT_PASSWORD },
 107         { "{ns-mta-md5}", PW_NS_MTA_MD5_PASSWORD },
 108         { "{x- orcllmv}", PW_LM_PASSWORD },
 109         { "{X- ORCLNTV}", PW_NT_PASSWORD },
 110         { NULL, 0 }
 111 };
 112
 113
 114 static int pap_detach(void *instance)
 115 {
 116         rlm_pap_t *inst = (rlm_pap_t *) instance;
 117
 118         free(inst);
 119
 120         return 0;
 121 }
 122
 123
 124 static int pap_instantiate(CONF_SECTION *conf, void **instance)
 125 {
 126         rlm_pap_t *inst;
 127         DICT_VALUE *dval;
 128
 129         /*
 130          *      Set up a storage area for instance data
 131          */
 132         inst = rad_malloc(sizeof(*inst));
 133         if (!inst) {
 134                 return -1;
 135         }
 136         memset(inst, 0, sizeof(*inst));
 137
 138         /*
 139          *      If the configuration parameters can't be parsed, then
 140          *      fail.
 141          */
 142         if (cf_section_parse(conf, inst, module_config) < 0) {
 143                 pap_detach(inst);
 144                 return -1;
 145         }
 146         if (inst->scheme == NULL || strlen(inst->scheme) == 0){
 147                 radlog(L_ERR, "rlm_pap: No scheme defined");
 148                 pap_detach(inst);
 149                 return -1;
 150         }
 151
 152         inst->sch = fr_str2int(schemes, inst->scheme, PAP_ENC_INVALID);
 153         if (inst->sch == PAP_ENC_INVALID) {
 154                 radlog(L_ERR, "rlm_pap: Unknown scheme \"%s\"", inst->scheme);
 155                 pap_detach(inst);
 156                 return -1;
 157         }
 158
 159         inst->name = cf_section_name2(conf);
 160         if (!inst->name) {
 161                 inst->name = cf_section_name1(conf);
 162         }
 163
 164         dval = dict_valbyname(PW_AUTH_TYPE, 0, inst->name);
 165         if (dval) {
 166                 inst->auth_type = dval->value;
 167         } else {
 168                 inst->auth_type = 0;
 169         }
 170
 171         *instance = inst;
 172
 173         return 0;
 174 }
 175
 176
 177 /*
 178  *      Decode one base64 chunk
 179  */
 180 static int decode_it(const char *src, uint8_t *dst)
 181 {
 182         int i;
 183         unsigned int x = 0;
 184
 185         for(i = 0; i < 4; i++) {
 186                 if (src[i] >= 'A' && src[i] <= 'Z')
 187                         x = (x << 6) + (unsigned int)(src[i] - 'A' + 0);
 188                 else if (src[i] >= 'a' && src[i] <= 'z')
 189                          x = (x << 6) + (unsigned int)(src[i] - 'a' + 26);
 190                 else if(src[i] >= '0' && src[i] <= '9')
 191                          x = (x << 6) + (unsigned int)(src[i] - '0' + 52);
 192                 else if(src[i] == '+')
 193                         x = (x << 6) + 62;
 194                 else if (src[i] == '/')
 195                         x = (x << 6) + 63;
 196                 else if (src[i] == '=')
 197                         x = (x << 6);
 198                 else return 0;
 199         }
 200
 201         dst[2] = (unsigned char)(x & 255); x >>= 8;
 202         dst[1] = (unsigned char)(x & 255); x >>= 8;
 203         dst[0] = (unsigned char)(x & 255);
 204
 205         return 1;
 206 }
 207
 208
 209 /*
 210  *      Base64 decoding.
 211  */
 212 static int base64_decode (const char *src, uint8_t *dst)
 213 {
 214         int length, equals;
 215         int i, num;
 216         uint8_t last[3];
 217
 218         length = equals = 0;
 219         while (src[length] && src[length] != '=') length++;
 220
 221         while (src[length + equals] == '=') equals++;
 222
 223         num = (length + equals) / 4;
 224
 225         for (i = 0; i < num - 1; i++) {
 226                 if (!decode_it(src, dst)) return 0;
 227                 src += 4;
 228                 dst += 3;
 229         }
 230
 231         decode_it(src, last);
 232         for (i = 0; i < (3 - equals); i++) {
 233                 dst[i] = last[i];
 234         }
 235
 236         return (num * 3) - equals;
 237 }
 238
 239
 240 /*
 241  *      Hex or base64 or bin auto-discovery.
 242  */
 243 static void normify(REQUEST *request, VALUE_PAIR *vp, size_t min_length)
 244 {
 245         size_t decoded;
 246         uint8_t buffer[64];
 247
 248         if (min_length >= sizeof(buffer)) return; /* paranoia */
 249
 250         /*
 251          *      Hex encoding.
 252          */
 253         if (vp->length >= (2 * min_length)) {
 254                 decoded = fr_hex2bin(vp->vp_strvalue, buffer, vp->length >> 1);
 255                 if (decoded == (vp->length >> 1)) {
 256                         RDEBUG2("Normalizing %s from hex encoding", vp->name);
 257                         memcpy(vp->vp_octets, buffer, decoded);
 258                         vp->length = decoded;
 259                         return;
 260                 }
 261         }
 262
 263         /*
 264          *      Base 64 encoding.  It's at least 4/3 the original size,
 265          *      and we want to avoid division...
 266          */
 267         if ((vp->length * 3) >= ((min_length * 4))) {
 268                 decoded = base64_decode(vp->vp_strvalue, buffer);
 269                 if (decoded >= min_length) {
 270                         RDEBUG2("Normalizing %s from base64 encoding", vp->name);
 271                         memcpy(vp->vp_octets, buffer, decoded);
 272                         vp->length = decoded;
 273                         return;
 274                 }
 275         }
 276
 277         /*
 278          *      Else unknown encoding, or already binary.  Leave it.
 279          */
 280 }
 281
 282
 283 /*
 284  *      Authorize the user for PAP authentication.
 285  *
 286  *      This isn't strictly necessary, but it does make the
 287  *      server simpler to configure.
 288  */
 289 static int pap_authorize(void *instance, REQUEST *request)
 290 {
 291         rlm_pap_t *inst = instance;
 292         int auth_type = FALSE;
 293         int found_pw = FALSE;
 294         VALUE_PAIR *vp, *next;
 295
 296         for (vp = request->config_items; vp != NULL; vp = next) {
 297                 next = vp->next;
 298
 299                 switch (vp->attribute) {
 300                 case PW_USER_PASSWORD: /* deprecated */
 301                         found_pw = TRUE;
 302
 303                         /*
 304                          *      Look for '{foo}', and use them
 305                          */
 306                         if (!inst->auto_header ||
 307                             (vp->vp_strvalue[0] != '{')) {
 308                                 break;
 309                         }
 310                         /* FALL-THROUGH */
 311
 312                 case PW_PASSWORD_WITH_HEADER: /* preferred */
 313                 {
 314                         int attr;
 315                         char *p, *q;
 316                         char buffer[128];
 317                         VALUE_PAIR *new_vp;
 318
 319                         found_pw = TRUE;
 320                 redo:
 321                         q = vp->vp_strvalue;
 322                         p = strchr(q + 1, '}');
 323                         if (!p) {
 324                                 int decoded;
 325
 326                                 /*
 327                                  *      Password already exists: use
 328                                  *      that instead of this one.
 329                                  */
 330                                 if (pairfind(request->config_items, PW_USER_PASSWORD) ||
 331                                     pairfind(request->config_items, PW_CLEARTEXT_PASSWORD)) {
 332                                         RDEBUG("Config already contains \"known good\" password.  Ignoring Password-With-Header");
 333                                         break;
 334                                 }
 335
 336                                 /*
 337                                  *      If it's binary, it may be
 338                                  *      base64 encoded.  Decode it,
 339                                  *      and re-write the attribute to
 340                                  *      have the decoded value.
 341                                  */
 342                                 decoded = base64_decode(vp->vp_strvalue, buffer);
 343                                 if ((decoded > 0) && (buffer[0] == '{') &&
 344                                     (strchr(buffer, '}') != NULL)) {
 345                                         memcpy(vp->vp_octets, buffer, decoded);
 346                                         vp->length = decoded;
 347                                         goto redo;
 348                                 }
 349
 350                                 RDEBUG("Failed to decode Password-With-Header = \"%s\"", vp->vp_strvalue);
 351                                 break;
 352                         }
 353
 354                         if ((size_t) (p - q) > sizeof(buffer)) break;
 355
 356                         memcpy(buffer, q, p - q + 1);
 357                         buffer[p - q + 1] = '\0';
 358
 359                         attr = fr_str2int(header_names, buffer, 0);
 360                         if (!attr) {
 361                                 RDEBUG2("Found unknown header {%s}: Not doing anything", buffer);
 362                                 break;
 363                         }
 364
 365                         new_vp = radius_paircreate(request,
 366                                                    &request->config_items,
 367                                                    attr, 0, PW_TYPE_STRING);
 368
 369                         /*
 370                          *      The data after the '}' may be binary,
 371                          *      so we copy it via memcpy.
 372                          */
 373                         new_vp->length = vp->length;
 374                         new_vp->length -= (p - q + 1);
 375                         memcpy(new_vp->vp_strvalue, p + 1, new_vp->length);
 376
 377                         /*
 378                          *      May be old-style User-Password with header.
 379                          *      We've found the header & created the proper
 380                          *      attribute, so we should delete the old
 381                          *      User-Password here.
 382                          */
 383                         pairdelete(&request->config_items, PW_USER_PASSWORD, 0);
 384                 }
 385                         break;
 386
 387                 case PW_CLEARTEXT_PASSWORD:
 388                 case PW_CRYPT_PASSWORD:
 389                 case PW_NS_MTA_MD5_PASSWORD:
 390                         found_pw = TRUE;
 391                         break;  /* don't touch these */
 392
 393                 case PW_MD5_PASSWORD:
 394                 case PW_SMD5_PASSWORD:
 395                 case PW_NT_PASSWORD:
 396                 case PW_LM_PASSWORD:
 397                         normify(request, vp, 16); /* ensure it's in the right format */
 398                         found_pw = TRUE;
 399                         break;
 400
 401                 case PW_SHA_PASSWORD:
 402                 case PW_SSHA_PASSWORD:
 403                         normify(request, vp, 20); /* ensure it's in the right format */
 404                         found_pw = TRUE;
 405                         break;
 406
 407                         /*
 408                          *      If it's proxied somewhere, don't complain
 409                          *      about not having passwords or Auth-Type.
 410                          */
 411                 case PW_PROXY_TO_REALM:
 412                 {
 413                         REALM *realm = realm_find(vp->vp_strvalue);
 414                         if (realm && realm->auth_pool) {
 415                                 return RLM_MODULE_NOOP;
 416                         }
 417                         break;
 418                 }
 419
 420                 case PW_AUTH_TYPE:
 421                         auth_type = TRUE;
 422
 423                         /*
 424                          *      Auth-Type := Accept
 425                          *      Auth-Type := Reject
 426                          */
 427                         if ((vp->vp_integer == 254) ||
 428                             (vp->vp_integer == 4)) {
 429                             found_pw = 1;
 430                         }
 431                         break;
 432
 433                 default:
 434                         break;  /* ignore it */
 435
 436                 }
 437         }
 438
 439         /*
 440          *      Print helpful warnings if there was no password.
 441          */
 442         if (!found_pw) {
 443                 /*
 444                  *      Likely going to be proxied.  Avoid printing
 445                  *      warning message.
 446                  */
 447                 if (pairfind(request->config_items, PW_REALM, 0) ||
 448                     (pairfind(request->config_items, PW_PROXY_TO_REALM, 0))) {
 449                         return RLM_MODULE_NOOP;
 450                 }
 451
 452                 /*
 453                  *      The TLS types don't need passwords.
 454                  */
 455                 vp = pairfind(request->packet->vps, PW_EAP_TYPE, 0);
 456                 if (vp &&
 457                     ((vp->vp_integer == 13) || /* EAP-TLS */
 458                      (vp->vp_integer == 21) || /* EAP-TTLS */
 459                      (vp->vp_integer == 25))) { /* PEAP */
 460                         return RLM_MODULE_NOOP;
 461                 }
 462
 463                 RDEBUG("WARNING! No \"known good\" password found for the user.  Authentication may fail because of this.");
 464                 return RLM_MODULE_NOOP;
 465         }
 466
 467         /*
 468          *      Don't touch existing Auth-Types.
 469          */
 470         if (auth_type) {
 471                 RDEBUG2("Found existing Auth-Type, not changing it.");
 472                 return RLM_MODULE_NOOP;
 473         }
 474
 475         /*
 476          *      Can't do PAP if there's no password.
 477          */
 478         if (!request->password ||
 479             (request->password->attribute != PW_USER_PASSWORD)) {
 480                 /*
 481                  *      Don't print out debugging messages if we know
 482                  *      they're useless.
 483                  */
 484                 if (request->packet->code == PW_ACCESS_CHALLENGE) {
 485                         return RLM_MODULE_NOOP;
 486                 }
 487
 488                 RDEBUG2("No clear-text password in the request.  Not performing PAP.");
 489                 return RLM_MODULE_NOOP;
 490         }
 491
 492         if (inst->auth_type) {
 493                 vp = radius_paircreate(request, &request->config_items,
 494                                        PW_AUTH_TYPE, 0, PW_TYPE_INTEGER);
 495                 vp->vp_integer = inst->auth_type;
 496         }
 497
 498         return RLM_MODULE_UPDATED;
 499 }
 500
 501
 502 /*
 503  *      Authenticate the user via one of any well-known password.
 504  */
 505 static int pap_authenticate(void *instance, REQUEST *request)
 506 {
 507         rlm_pap_t *inst = instance;
 508         VALUE_PAIR *vp;
 509         VALUE_PAIR *module_fmsg_vp;
 510         char module_fmsg[MAX_STRING_LEN];
 511         FR_MD5_CTX md5_context;
 512         fr_SHA1_CTX sha1_context;
 513         uint8_t digest[40];
 514         char buff[MAX_STRING_LEN];
 515         char buff2[MAX_STRING_LEN + 50];
 516         int scheme = PAP_ENC_INVALID;
 517
 518         if (!request->password){
 519                 radlog_request(L_AUTH, 0, request, "Attribute \"Password\" is required for authentication.");
 520                 return RLM_MODULE_INVALID;
 521         }
 522
 523         /*
 524          *      Clear-text passwords are the only ones we support.
 525          */
 526         if (request->password->attribute != PW_USER_PASSWORD) {
 527                 radlog_request(L_AUTH, 0, request, "Attribute \"User-Password\" is required for authentication. Cannot use \"%s\".", request->password->name);
 528                 return RLM_MODULE_INVALID;
 529         }
 530
 531         /*
 532          *      The user MUST supply a non-zero-length password.
 533          */
 534         if (request->password->length == 0) {
 535                 snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: empty password supplied");
 536                 module_fmsg_vp = pairmake("Module-Failure-Message", module_fmsg, T_OP_EQ);
 537                 pairadd(&request->packet->vps, module_fmsg_vp);
 538                 return RLM_MODULE_INVALID;
 539         }
 540
 541         RDEBUG("login attempt with password \"%s\"",
 542               request->password->vp_strvalue);
 543
 544         /*
 545          *      First, auto-detect passwords, by attribute in the
 546          *      config items.
 547          */
 548         if (inst->sch == PAP_ENC_AUTO) {
 549                 for (vp = request->config_items; vp != NULL; vp = vp->next) {
 550                         switch (vp->attribute) {
 551                         case PW_USER_PASSWORD: /* deprecated */
 552                         case PW_CLEARTEXT_PASSWORD: /* preferred */
 553                                 goto do_clear;
 554
 555                         case PW_CRYPT_PASSWORD:
 556                                 goto do_crypt;
 557
 558                         case PW_MD5_PASSWORD:
 559                                 goto do_md5;
 560
 561                         case PW_SHA_PASSWORD:
 562                                 goto do_sha;
 563
 564                         case PW_NT_PASSWORD:
 565                                 goto do_nt;
 566
 567                         case PW_LM_PASSWORD:
 568                                 goto do_lm;
 569
 570                         case PW_SMD5_PASSWORD:
 571                                 goto do_smd5;
 572
 573                         case PW_SSHA_PASSWORD:
 574                                 goto do_ssha;
 575
 576                         case PW_NS_MTA_MD5_PASSWORD:
 577                                 goto do_ns_mta_md5;
 578
 579                         default:
 580                                 break;  /* ignore it */
 581
 582                         }
 583                 }
 584
 585         fail:
 586                 RDEBUG("No password configured for the user.  Cannot do authentication");
 587                 return RLM_MODULE_FAIL;
 588
 589         } else {
 590                 vp = NULL;
 591
 592                 if (inst->sch == PAP_ENC_CRYPT) {
 593                         vp = pairfind(request->config_items, PW_CRYPT_PASSWORD, 0);
 594                 }
 595
 596                 /*
 597                  *      Old-style: all passwords are in User-Password.
 598                  */
 599                 if (!vp) {
 600                         vp = pairfind(request->config_items, PW_USER_PASSWORD, 0);
 601                         if (!vp) goto fail;
 602                 }
 603         }
 604
 605         /*
 606          *      Now that we've decided what to do, go do it.
 607          */
 608         switch (scheme) {
 609         case PAP_ENC_CLEAR:
 610         do_clear:
 611                 RDEBUG("Using clear text password \"%s\"",
 612                       vp->vp_strvalue);
 613                 if (strcmp((char *) vp->vp_strvalue,
 614                            (char *) request->password->vp_strvalue) != 0){
 615                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: CLEAR TEXT password check failed");
 616                         goto make_msg;
 617                 }
 618         done:
 619                 RDEBUG("User authenticated successfully");
 620                 return RLM_MODULE_OK;
 621                 break;
 622
 623         case PAP_ENC_CRYPT:
 624         do_crypt:
 625                 RDEBUG("Using CRYPT encryption.");
 626                 if (fr_crypt_check((char *) request->password->vp_strvalue,
 627                                      (char *) vp->vp_strvalue) != 0) {
 628                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: CRYPT password check failed");
 629                         goto make_msg;
 630                 }
 631                 goto done;
 632                 break;
 633
 634         case PW_MD5_PASSWORD:
 635         do_md5:
 636                 RDEBUG("Using MD5 encryption.");
 637
 638                 normify(request, vp, 16);
 639                 if (vp->length != 16) {
 640                 RDEBUG("Configured MD5 password has incorrect length");
 641                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured MD5 password has incorrect length");
 642                         goto make_msg;
 643                 }
 644
 645                 fr_MD5Init(&md5_context);
 646                 fr_MD5Update(&md5_context, request->password->vp_octets,
 647                              request->password->length);
 648                 fr_MD5Final(digest, &md5_context);
 649                 if (memcmp(digest, vp->vp_octets, vp->length) != 0) {
 650                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: MD5 password check failed");
 651                         goto make_msg;
 652                 }
 653                 goto done;
 654                 break;
 655
 656         case PW_SMD5_PASSWORD:
 657         do_smd5:
 658                 RDEBUG("Using SMD5 encryption.");
 659
 660                 normify(request, vp, 16);
 661                 if (vp->length <= 16) {
 662                         RDEBUG("Configured SMD5 password has incorrect length");
 663                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured SMD5 password has incorrect length");
 664                         goto make_msg;
 665                 }
 666
 667                 fr_MD5Init(&md5_context);
 668                 fr_MD5Update(&md5_context, request->password->vp_octets,
 669                              request->password->length);
 670                 fr_MD5Update(&md5_context, &vp->vp_octets[16], vp->length - 16);
 671                 fr_MD5Final(digest, &md5_context);
 672
 673                 /*
 674                  *      Compare only the MD5 hash results, not the salt.
 675                  */
 676                 if (memcmp(digest, vp->vp_octets, 16) != 0) {
 677                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: SMD5 password check failed");
 678                         goto make_msg;
 679                 }
 680                 goto done;
 681                 break;
 682
 683         case PW_SHA_PASSWORD:
 684         do_sha:
 685                 RDEBUG("Using SHA1 encryption.");
 686
 687                 normify(request, vp, 20);
 688                 if (vp->length != 20) {
 689                         RDEBUG("Configured SHA1 password has incorrect length");
 690                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured SHA1 password has incorrect length");
 691                         goto make_msg;
 692                 }
 693
 694                 fr_SHA1Init(&sha1_context);
 695                 fr_SHA1Update(&sha1_context, request->password->vp_octets,
 696                               request->password->length);
 697                 fr_SHA1Final(digest,&sha1_context);
 698                 if (memcmp(digest, vp->vp_octets, vp->length) != 0) {
 699                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: SHA1 password check failed");
 700                         goto make_msg;
 701                 }
 702                 goto done;
 703                 break;
 704
 705         case PW_SSHA_PASSWORD:
 706         do_ssha:
 707                 RDEBUG("Using SSHA encryption.");
 708
 709                 normify(request, vp, 20);
 710                 if (vp->length <= 20) {
 711                         RDEBUG("Configured SSHA password has incorrect length");
 712                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured SHA password has incorrect length");
 713                         goto make_msg;
 714                 }
 715
 716
 717                 fr_SHA1Init(&sha1_context);
 718                 fr_SHA1Update(&sha1_context, request->password->vp_octets,
 719                            request->password->length);
 720                 fr_SHA1Update(&sha1_context, &vp->vp_octets[20], vp->length - 20);
 721                 fr_SHA1Final(digest,&sha1_context);
 722                 if (memcmp(digest, vp->vp_octets, 20) != 0) {
 723                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: SSHA password check failed");
 724                         goto make_msg;
 725                 }
 726                 goto done;
 727                 break;
 728
 729         case PW_NT_PASSWORD:
 730         do_nt:
 731                 RDEBUG("Using NT encryption.");
 732
 733                 normify(request, vp, 16);
 734                 if (vp->length != 16) {
 735                         RDEBUG("Configured NT-Password has incorrect length");
 736                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured NT-Password has incorrect length");
 737                         goto make_msg;
 738                 }
 739
 740
 741                 strlcpy(buff2, "%{mschap:NT-Hash %{User-Password}}", sizeof(buff2));
 742                 if (!radius_xlat(digest, sizeof(digest),buff2,request,NULL)){
 743                         RDEBUG("mschap xlat failed");
 744                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: mschap xlat failed");
 745                         goto make_msg;
 746                 }
 747                 if ((fr_hex2bin(digest, digest, 16) != vp->length) ||
 748                     (memcmp(digest, vp->vp_octets, vp->length) != 0)) {
 749                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: NT password check failed");
 750                         goto make_msg;
 751                 }
 752                 goto done;
 753                 break;
 754
 755         case PW_LM_PASSWORD:
 756         do_lm:
 757                 RDEBUG("Using LM encryption.");
 758
 759                 normify(request, vp, 16);
 760                 if (vp->length != 16) {
 761                         RDEBUG("Configured LM-Password has incorrect length");
 762                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured LM-Password has incorrect length");
 763                         goto make_msg;
 764                 }
 765                 strlcpy(buff2, "%{mschap:LM-Hash %{User-Password}}", sizeof(buff2));
 766                 if (!radius_xlat(digest,sizeof(digest),buff2,request,NULL)){
 767                         RDEBUG("mschap xlat failed");
 768                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: mschap xlat failed");
 769                         goto make_msg;
 770                 }
 771                 if ((fr_hex2bin(digest, digest, 16) != vp->length) ||
 772                     (memcmp(digest, vp->vp_octets, vp->length) != 0)) {
 773                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: LM password check failed");
 774                 make_msg:
 775                         RDEBUG("Passwords don't match");
 776                         module_fmsg_vp = pairmake("Module-Failure-Message",
 777                                                   module_fmsg, T_OP_EQ);
 778                         pairadd(&request->packet->vps, module_fmsg_vp);
 779                         return RLM_MODULE_REJECT;
 780                 }
 781                 goto done;
 782                 break;
 783
 784         case PAP_ENC_NS_MTA_MD5:
 785         do_ns_mta_md5:
 786                 RDEBUG("Using NT-MTA-MD5 password");
 787
 788                 if (vp->length != 64) {
 789                         RDEBUG("Configured NS-MTA-MD5-Password has incorrect length");
 790                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured NS-MTA-MD5-Password has incorrect length");
 791                         goto make_msg;
 792                 }
 793
 794                 /*
 795                  *      Sanity check the value of NS-MTA-MD5-Password
 796                  */
 797                 if (fr_hex2bin(vp->vp_strvalue, buff, 32) != 16) {
 798                         RDEBUG("Configured NS-MTA-MD5-Password has invalid value");
 799                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: Configured NS-MTA-MD5-Password has invalid value");
 800                         goto make_msg;
 801                 }
 802
 803                 /*
 804                  *      Ensure we don't have buffer overflows.
 805                  *
 806                  *      This really: sizeof(buff) - 2 - 2*32 - strlen(passwd)
 807                  */
 808                 if (strlen(request->password->vp_strvalue) >= (sizeof(buff2) - 2 - 2 * 32)) {
 809                         RDEBUG("Configured password is too long");
 810                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: password is too long");
 811                         goto make_msg;
 812                 }
 813
 814                 /*
 815                  *      Set up the algorithm.
 816                  */
 817                 {
 818                         char *p = buff2;
 819
 820                         memcpy(p, &vp->vp_octets[32], 32);
 821                         p += 32;
 822                         *(p++) = 89;
 823                         strcpy(p, request->password->vp_strvalue);
 824                         p += strlen(p);
 825                         *(p++) = 247;
 826                         memcpy(p, &vp->vp_octets[32], 32);
 827                         p += 32;
 828
 829                         fr_MD5Init(&md5_context);
 830                         fr_MD5Update(&md5_context, (uint8_t *) buff2,
 831                                      p - buff2);
 832                         fr_MD5Final(digest, &md5_context);
 833                 }
 834                 if (memcmp(digest, buff, 16) != 0) {
 835                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: NS-MTA-MD5 password check failed");
 836                         goto make_msg;
 837                 }
 838                 goto done;
 839
 840         default:
 841                 break;
 842         }
 843
 844         RDEBUG("No password configured for the user.  Cannot do authentication");
 845         return RLM_MODULE_FAIL;
 846 }
 847
 848
 849 /*
 850  *      The module name should be the only globally exported symbol.
 851  *      That is, everything else should be 'static'.
 852  *
 853  *      If the module needs to temporarily modify it's instantiation
 854  *      data, the type should be changed to RLM_TYPE_THREAD_UNSAFE.
 855  *      The server will then take care of ensuring that the module
 856  *      is single-threaded.
 857  */
 858 module_t rlm_pap = {
 859         RLM_MODULE_INIT,
 860         "PAP",
 861         RLM_TYPE_CHECK_CONFIG_SAFE | RLM_TYPE_HUP_SAFE,         /* type */
 862         pap_instantiate,                /* instantiation */
 863         pap_detach,                     /* detach */
 864         {
 865                 pap_authenticate,       /* authentication */
 866                 pap_authorize,          /* authorization */
 867                 NULL,                   /* preaccounting */
 868                 NULL,                   /* accounting */
 869                 NULL,                   /* checksimul */
 870                 NULL,                   /* pre-proxy */
 871                 NULL,                   /* post-proxy */
 872                 NULL                    /* post-auth */
 873         },
 874 };