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 2001-2012  The FreeRADIUS server project
  21  * Copyright 2012       Matthew Newton <matthew@newtoncomputing.co.uk>
  22  * Copyright 2001       Kostas Kalevras <kkalev@noc.ntua.gr>
  23  */
  24
  25 #include <freeradius-devel/ident.h>
  26 RCSID("$Id$")
  27
  28 #include <freeradius-devel/radiusd.h>
  29 #include <freeradius-devel/modules.h>
  30
  31 #include <ctype.h>
  32
  33 #include "../../include/md5.h"
  34 #include "../../include/sha1.h"
  35
  36 #include "rlm_pap.h"
  37
  38 /*
  39  *      Define a structure for our module configuration.
  40  *
  41  *      These variables do not need to be in a structure, but it's
  42  *      a lot cleaner to do so, and a pointer to the structure can
  43  *      be used as the instance handle.
  44  */
  45 typedef struct rlm_pap_t {
  46         const char *name;       /* CONF_SECTION->name, not strdup'd */
  47         int auto_header;
  48         int auth_type;
  49 } rlm_pap_t;
  50
  51 /*
  52  *      A mapping of configuration file names to internal variables.
  53  *
  54  *      Note that the string is dynamically allocated, so it MUST
  55  *      be freed.  When the configuration file parse re-reads the string,
  56  *      it free's the old one, and strdup's the new one, placing the pointer
  57  *      to the strdup'd string into 'config.string'.  This gets around
  58  *      buffer over-flows.
  59  */
  60 static const CONF_PARSER module_config[] = {
  61         { "auto_header", PW_TYPE_BOOLEAN, offsetof(rlm_pap_t,auto_header), NULL, "no" },
  62         { NULL, -1, 0, NULL, NULL }
  63 };
  64
  65
  66 /*
  67  *      For auto-header discovery.
  68  */
  69 static const FR_NAME_NUMBER header_names[] = {
  70         { "{clear}",            PW_CLEARTEXT_PASSWORD },
  71         { "{cleartext}",        PW_CLEARTEXT_PASSWORD },
  72         { "{md5}",              PW_MD5_PASSWORD },
  73         { "{BASE64_MD5}",       PW_MD5_PASSWORD },
  74         { "{smd5}",             PW_SMD5_PASSWORD },
  75         { "{crypt}",            PW_CRYPT_PASSWORD },
  76         { "{sha}",              PW_SHA_PASSWORD },
  77         { "{ssha}",             PW_SSHA_PASSWORD },
  78         { "{nt}",               PW_NT_PASSWORD },
  79         { "{nthash}",           PW_NT_PASSWORD },
  80         { "{x-nthash}",         PW_NT_PASSWORD },
  81         { "{ns-mta-md5}",       PW_NS_MTA_MD5_PASSWORD },
  82         { "{x- orcllmv}",       PW_LM_PASSWORD },
  83         { "{X- ORCLNTV}",       PW_NT_PASSWORD },
  84         { NULL, 0 }
  85 };
  86
  87
  88 static int pap_detach(void *instance)
  89 {
  90         rlm_pap_t *inst = (rlm_pap_t *) instance;
  91
  92         free(inst);
  93
  94         return 0;
  95 }
  96
  97
  98 static int pap_instantiate(CONF_SECTION *conf, void **instance)
  99 {
 100         rlm_pap_t *inst;
 101         DICT_VALUE *dval;
 102
 103         /*
 104          *      Set up a storage area for instance data
 105          */
 106         inst = rad_malloc(sizeof(*inst));
 107         if (!inst) {
 108                 return -1;
 109         }
 110         memset(inst, 0, sizeof(*inst));
 111
 112         /*
 113          *      If the configuration parameters can't be parsed, then
 114          *      fail.
 115          */
 116         if (cf_section_parse(conf, inst, module_config) < 0) {
 117                 pap_detach(inst);
 118                 return -1;
 119         }
 120
 121         inst->name = cf_section_name2(conf);
 122         if (!inst->name) {
 123                 inst->name = cf_section_name1(conf);
 124         }
 125
 126         dval = dict_valbyname(PW_AUTH_TYPE, 0, inst->name);
 127         if (dval) {
 128                 inst->auth_type = dval->value;
 129         } else {
 130                 inst->auth_type = 0;
 131         }
 132
 133         *instance = inst;
 134
 135         return 0;
 136 }
 137
 138
 139 /*
 140  *      Decode one base64 chunk
 141  */
 142 static int decode_it(const char *src, uint8_t *dst)
 143 {
 144         int i;
 145         unsigned int x = 0;
 146
 147         for(i = 0; i < 4; i++) {
 148                 if (src[i] >= 'A' && src[i] <= 'Z')
 149                         x = (x << 6) + (unsigned int)(src[i] - 'A' + 0);
 150                 else if (src[i] >= 'a' && src[i] <= 'z')
 151                          x = (x << 6) + (unsigned int)(src[i] - 'a' + 26);
 152                 else if(src[i] >= '0' && src[i] <= '9')
 153                          x = (x << 6) + (unsigned int)(src[i] - '0' + 52);
 154                 else if(src[i] == '+')
 155                         x = (x << 6) + 62;
 156                 else if (src[i] == '/')
 157                         x = (x << 6) + 63;
 158                 else if (src[i] == '=')
 159                         x = (x << 6);
 160                 else return 0;
 161         }
 162
 163         dst[2] = (unsigned char)(x & 255); x >>= 8;
 164         dst[1] = (unsigned char)(x & 255); x >>= 8;
 165         dst[0] = (unsigned char)(x & 255);
 166
 167         return 1;
 168 }
 169
 170
 171 /*
 172  *      Base64 decoding.
 173  */
 174 static int base64_decode (const char *src, uint8_t *dst)
 175 {
 176         int length, equals;
 177         int i, num;
 178         uint8_t last[3];
 179
 180         length = equals = 0;
 181         while (src[length] && src[length] != '=') length++;
 182
 183         while (src[length + equals] == '=') equals++;
 184
 185         num = (length + equals) / 4;
 186
 187         for (i = 0; i < num - 1; i++) {
 188                 if (!decode_it(src, dst)) return 0;
 189                 src += 4;
 190                 dst += 3;
 191         }
 192
 193         decode_it(src, last);
 194         for (i = 0; i < (3 - equals); i++) {
 195                 dst[i] = last[i];
 196         }
 197
 198         return (num * 3) - equals;
 199 }
 200
 201
 202 /*
 203  *      Hex or base64 or bin auto-discovery.
 204  */
 205 static void normify(REQUEST *request, VALUE_PAIR *vp, size_t min_length)
 206 {
 207         size_t decoded;
 208         uint8_t buffer[64];
 209
 210         if (min_length >= sizeof(buffer)) return; /* paranoia */
 211
 212         /*
 213          *      Hex encoding.
 214          */
 215         if (vp->length >= (2 * min_length)) {
 216                 decoded = fr_hex2bin(vp->vp_strvalue, buffer, vp->length >> 1);
 217                 if (decoded == (vp->length >> 1)) {
 218                         RDEBUG2("Normalizing %s from hex encoding", vp->name);
 219                         memcpy(vp->vp_octets, buffer, decoded);
 220                         vp->length = decoded;
 221                         return;
 222                 }
 223         }
 224
 225         /*
 226          *      Base 64 encoding.  It's at least 4/3 the original size,
 227          *      and we want to avoid division...
 228          */
 229         if ((vp->length * 3) >= ((min_length * 4))) {
 230                 decoded = base64_decode(vp->vp_strvalue, buffer);
 231                 if (decoded >= min_length) {
 232                         RDEBUG2("Normalizing %s from base64 encoding", vp->name);
 233                         memcpy(vp->vp_octets, buffer, decoded);
 234                         vp->length = decoded;
 235                         return;
 236                 }
 237         }
 238
 239         /*
 240          *      Else unknown encoding, or already binary.  Leave it.
 241          */
 242 }
 243
 244
 245 /*
 246  *      Authorize the user for PAP authentication.
 247  *
 248  *      This isn't strictly necessary, but it does make the
 249  *      server simpler to configure.
 250  */
 251 static int pap_authorize(void *instance, REQUEST *request)
 252 {
 253         rlm_pap_t *inst = instance;
 254         int auth_type = FALSE;
 255         int found_pw = FALSE;
 256         VALUE_PAIR *vp, *next;
 257
 258         for (vp = request->config_items; vp != NULL; vp = next) {
 259                 next = vp->next;
 260
 261                 switch (vp->attribute) {
 262                 case PW_USER_PASSWORD: /* deprecated */
 263                         RDEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 264                         RDEBUG("!!! Please update your configuration so that the \"known !!!");
 265                         RDEBUG("!!! good\" clear text password is in Cleartext-Password, !!!");
 266                         RDEBUG("!!! and NOT in User-Password.                           !!!");
 267                         RDEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 268                         break;
 269
 270                 case PW_PASSWORD_WITH_HEADER: /* preferred */
 271                 {
 272                         int attr;
 273                         char *p, *q;
 274                         uint8_t binbuf[128];
 275                         char charbuf[128];
 276                         VALUE_PAIR *new_vp;
 277
 278                         found_pw = TRUE;
 279                 redo:
 280                         q = vp->vp_strvalue;
 281                         p = strchr(q + 1, '}');
 282                         if (!p) {
 283                                 int decoded;
 284
 285                                 /*
 286                                  *      Password already exists: use
 287                                  *      that instead of this one.
 288                                  */
 289                                 if (pairfind(request->config_items, PW_CLEARTEXT_PASSWORD, 0)) {
 290                                         RDEBUG("Config already contains \"known good\" password.  Ignoring Password-With-Header");
 291                                         break;
 292                                 }
 293
 294                                 /*
 295                                  *      If it's binary, it may be
 296                                  *      base64 encoded.  Decode it,
 297                                  *      and re-write the attribute to
 298                                  *      have the decoded value.
 299                                  */
 300                                 decoded = base64_decode(vp->vp_strvalue, binbuf);
 301                                 if ((decoded > 0) && (binbuf[0] == '{') &&
 302                                     (memchr(binbuf, '}', decoded) != NULL)) {
 303                                         memcpy(vp->vp_octets, binbuf, decoded);
 304                                         vp->length = decoded;
 305                                         goto redo;
 306                                 }
 307
 308                                 RDEBUG("Failed to decode Password-With-Header = \"%s\"", vp->vp_strvalue);
 309                                 break;
 310                         }
 311
 312                         if ((size_t) (p - q) > sizeof(charbuf)) break;
 313
 314                         memcpy(charbuf, q, p - q + 1);
 315                         charbuf[p - q + 1] = '\0';
 316
 317                         attr = fr_str2int(header_names, charbuf, 0);
 318                         if (!attr) {
 319                                 RDEBUG2("Found unknown header {%s}: Not doing anything", charbuf);
 320                                 break;
 321                         }
 322
 323                         new_vp = radius_paircreate(request,
 324                                                    &request->config_items,
 325                                                    attr, 0, PW_TYPE_STRING);
 326
 327                         /*
 328                          *      The data after the '}' may be binary,
 329                          *      so we copy it via memcpy.
 330                          */
 331                         new_vp->length = vp->length;
 332                         new_vp->length -= (p - q + 1);
 333                         memcpy(new_vp->vp_strvalue, p + 1, new_vp->length);
 334                 }
 335                         break;
 336
 337                 case PW_CLEARTEXT_PASSWORD:
 338                 case PW_CRYPT_PASSWORD:
 339                 case PW_NS_MTA_MD5_PASSWORD:
 340                         found_pw = TRUE;
 341                         break;  /* don't touch these */
 342
 343                 case PW_MD5_PASSWORD:
 344                 case PW_SMD5_PASSWORD:
 345                 case PW_NT_PASSWORD:
 346                 case PW_LM_PASSWORD:
 347                         normify(request, vp, 16); /* ensure it's in the right format */
 348                         found_pw = TRUE;
 349                         break;
 350
 351                 case PW_SHA_PASSWORD:
 352                 case PW_SSHA_PASSWORD:
 353                         normify(request, vp, 20); /* ensure it's in the right format */
 354                         found_pw = TRUE;
 355                         break;
 356
 357                         /*
 358                          *      If it's proxied somewhere, don't complain
 359                          *      about not having passwords or Auth-Type.
 360                          */
 361                 case PW_PROXY_TO_REALM:
 362                 {
 363                         REALM *realm = realm_find(vp->vp_strvalue);
 364                         if (realm && realm->auth_pool) {
 365                                 return RLM_MODULE_NOOP;
 366                         }
 367                         break;
 368                 }
 369
 370                 case PW_AUTH_TYPE:
 371                         auth_type = TRUE;
 372
 373                         /*
 374                          *      Auth-Type := Accept
 375                          *      Auth-Type := Reject
 376                          */
 377                         if ((vp->vp_integer == 254) ||
 378                             (vp->vp_integer == 4)) {
 379                             found_pw = 1;
 380                         }
 381                         break;
 382
 383                 default:
 384                         break;  /* ignore it */
 385
 386                 }
 387         }
 388
 389         /*
 390          *      Print helpful warnings if there was no password.
 391          */
 392         if (!found_pw) {
 393                 /*
 394                  *      Likely going to be proxied.  Avoid printing
 395                  *      warning message.
 396                  */
 397                 if (pairfind(request->config_items, PW_REALM, 0) ||
 398                     (pairfind(request->config_items, PW_PROXY_TO_REALM, 0))) {
 399                         return RLM_MODULE_NOOP;
 400                 }
 401
 402                 /*
 403                  *      The TLS types don't need passwords.
 404                  */
 405                 vp = pairfind(request->packet->vps, PW_EAP_TYPE, 0);
 406                 if (vp &&
 407                     ((vp->vp_integer == 13) || /* EAP-TLS */
 408                      (vp->vp_integer == 21) || /* EAP-TTLS */
 409                      (vp->vp_integer == 25))) { /* PEAP */
 410                         return RLM_MODULE_NOOP;
 411                 }
 412
 413                 RDEBUG("WARNING! No \"known good\" password found for the user.  Authentication may fail because of this.");
 414                 return RLM_MODULE_NOOP;
 415         }
 416
 417         /*
 418          *      Don't touch existing Auth-Types.
 419          */
 420         if (auth_type) {
 421                 RDEBUG2("WARNING: Auth-Type already set.  Not setting to PAP");
 422                 return RLM_MODULE_NOOP;
 423         }
 424
 425         /*
 426          *      Can't do PAP if there's no password.
 427          */
 428         if (!request->password ||
 429             (request->password->attribute != PW_USER_PASSWORD)) {
 430                 /*
 431                  *      Don't print out debugging messages if we know
 432                  *      they're useless.
 433                  */
 434                 if (request->packet->code == PW_ACCESS_CHALLENGE) {
 435                         return RLM_MODULE_NOOP;
 436                 }
 437
 438                 RDEBUG2("No clear-text password in the request.  Not performing PAP.");
 439                 return RLM_MODULE_NOOP;
 440         }
 441
 442         if (inst->auth_type) {
 443                 vp = radius_paircreate(request, &request->config_items,
 444                                        PW_AUTH_TYPE, 0, PW_TYPE_INTEGER);
 445                 vp->vp_integer = inst->auth_type;
 446         }
 447
 448         return RLM_MODULE_UPDATED;
 449 }
 450
 451
 452 /*
 453  *      Authenticate the user via one of any well-known password.
 454  */
 455 static int pap_authenticate(void *instance, REQUEST *request)
 456 {
 457         VALUE_PAIR *vp;
 458         VALUE_PAIR *module_fmsg_vp;
 459         char module_fmsg[MAX_STRING_LEN];
 460         int rc = RLM_MODULE_INVALID;
 461         int (*auth_func)(REQUEST *, VALUE_PAIR *, char *) = NULL;
 462
 463         /* Shut the compiler up */
 464         instance = instance;
 465
 466         if (!request->password ||
 467             (request->password->attribute != PW_USER_PASSWORD)) {
 468                 RDEBUG("ERROR: You set 'Auth-Type = PAP' for a request that does not contain a User-Password attribute!");
 469                 return RLM_MODULE_INVALID;
 470         }
 471
 472         /*
 473          *      The user MUST supply a non-zero-length password.
 474          */
 475         if (request->password->length == 0) {
 476                 snprintf(module_fmsg,sizeof(module_fmsg),"rlm_pap: empty password supplied");
 477                 module_fmsg_vp = pairmake("Module-Failure-Message", module_fmsg, T_OP_EQ);
 478                 pairadd(&request->packet->vps, module_fmsg_vp);
 479                 return RLM_MODULE_INVALID;
 480         }
 481
 482         RDEBUG("login attempt with password \"%s\"", request->password->vp_strvalue);
 483
 484         /*
 485          *      Auto-detect passwords, by attribute in the
 486          *      config items, to find out which authentication
 487          *      function to call.
 488          */
 489         for (vp = request->config_items; vp != NULL; vp = vp->next) {
 490                 switch (vp->attribute) {
 491                 case PW_CLEARTEXT_PASSWORD:
 492                         auth_func = &pap_auth_clear;
 493                         break;
 494
 495                 case PW_CRYPT_PASSWORD:
 496                         auth_func = &pap_auth_crypt;
 497                         break;
 498
 499                 case PW_MD5_PASSWORD:
 500                         auth_func = &pap_auth_md5;
 501                         break;
 502
 503                 case PW_SMD5_PASSWORD:
 504                         auth_func = &pap_auth_smd5;
 505                         break;
 506
 507                 case PW_SHA_PASSWORD:
 508                         auth_func = &pap_auth_sha;
 509                         break;
 510
 511                 case PW_SSHA_PASSWORD:
 512                         auth_func = &pap_auth_ssha;
 513                         break;
 514
 515                 case PW_NT_PASSWORD:
 516                         auth_func = &pap_auth_nt;
 517                         break;
 518
 519                 case PW_LM_PASSWORD:
 520                         auth_func = &pap_auth_lm;
 521                         break;
 522
 523                 case PW_NS_MTA_MD5_PASSWORD:
 524                         auth_func = &pap_auth_ns_mta_md5;
 525                         break;
 526
 527                 default:
 528                         break;
 529                 }
 530
 531                 if (auth_func != NULL) break;
 532         }
 533
 534         /*
 535          *      No attribute was found that looked like a password to match.
 536          */
 537         if (auth_func == NULL) {
 538                 RDEBUG("No password configured for the user.  Cannot do authentication");
 539                 return RLM_MODULE_FAIL;
 540         }
 541
 542         /*
 543          *      Authenticate, and return.
 544          */
 545         rc = auth_func(request, vp, module_fmsg);
 546
 547         if (rc == RLM_MODULE_REJECT) {
 548                 RDEBUG("Passwords don't match");
 549                 module_fmsg_vp = pairmake("Module-Failure-Message",
 550                                           module_fmsg, T_OP_EQ);
 551                 pairadd(&request->packet->vps, module_fmsg_vp);
 552         }
 553
 554         if (rc == RLM_MODULE_OK) {
 555                 RDEBUG("User authenticated successfully");
 556         }
 557
 558         return rc;
 559 }
 560
 561
 562 /*
 563  *      PAP authentication functions
 564  */
 565
 566 static int pap_auth_clear(REQUEST *request, VALUE_PAIR *vp, char *fmsg)
 567 {
 568         RDEBUG("Using clear text password \"%s\"", vp->vp_strvalue);
 569
 570         if ((vp->length != request->password->length) ||
 571             (rad_digest_cmp(vp->vp_octets,
 572                             request->password->vp_octets,
 573                             vp->length) != 0)) {
 574                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 575                         "rlm_pap: CLEAR TEXT password check failed");
 576                 return RLM_MODULE_REJECT;
 577         }
 578         return RLM_MODULE_OK;
 579 }
 580
 581 static int pap_auth_crypt(REQUEST *request, VALUE_PAIR *vp, char *fmsg)
 582 {
 583         RDEBUG("Using CRYPT password \"%s\"", vp->vp_strvalue);
 584
 585         if (fr_crypt_check(request->password->vp_strvalue,
 586                            vp->vp_strvalue) != 0) {
 587                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 588                         "rlm_pap: CRYPT password check failed");
 589                 return RLM_MODULE_REJECT;
 590         }
 591         return RLM_MODULE_OK;
 592 }
 593
 594 static int pap_auth_md5(REQUEST *request, VALUE_PAIR *vp, char *fmsg)
 595 {
 596         FR_MD5_CTX md5_context;
 597         uint8_t binbuf[128];
 598
 599         RDEBUG("Using MD5 encryption.");
 600
 601         normify(request, vp, 16);
 602         if (vp->length != 16) {
 603                 RDEBUG("Configured MD5 password has incorrect length");
 604                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 605                         "rlm_pap: Configured MD5 password has incorrect length");
 606                 return RLM_MODULE_REJECT;
 607         }
 608
 609         fr_MD5Init(&md5_context);
 610         fr_MD5Update(&md5_context, request->password->vp_octets,
 611                      request->password->length);
 612         fr_MD5Final(binbuf, &md5_context);
 613
 614         if (rad_digest_cmp(binbuf, vp->vp_octets, vp->length) != 0) {
 615                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 616                         "rlm_pap: MD5 password check failed");
 617                 return RLM_MODULE_REJECT;
 618         }
 619
 620         return RLM_MODULE_OK;
 621 }
 622
 623
 624 static int pap_auth_smd5(REQUEST *request, VALUE_PAIR *vp, char *fmsg)
 625 {
 626         FR_MD5_CTX md5_context;
 627         uint8_t binbuf[128];
 628
 629         RDEBUG("Using SMD5 encryption.");
 630
 631         normify(request, vp, 16);
 632         if (vp->length <= 16) {
 633                 RDEBUG("Configured SMD5 password has incorrect length");
 634                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 635                         "rlm_pap: Configured SMD5 password has incorrect length");
 636                 return RLM_MODULE_REJECT;
 637         }
 638
 639         fr_MD5Init(&md5_context);
 640         fr_MD5Update(&md5_context, request->password->vp_octets,
 641                      request->password->length);
 642         fr_MD5Update(&md5_context, &vp->vp_octets[16], vp->length - 16);
 643         fr_MD5Final(binbuf, &md5_context);
 644
 645         /*
 646          *      Compare only the MD5 hash results, not the salt.
 647          */
 648         if (rad_digest_cmp(binbuf, vp->vp_octets, 16) != 0) {
 649                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 650                         "rlm_pap: SMD5 password check failed");
 651                 return RLM_MODULE_REJECT;
 652         }
 653
 654         return RLM_MODULE_OK;
 655 }
 656
 657 static int pap_auth_sha(REQUEST *request, VALUE_PAIR *vp, char *fmsg)
 658 {
 659         fr_SHA1_CTX sha1_context;
 660         uint8_t binbuf[128];
 661
 662         RDEBUG("Using SHA1 encryption.");
 663
 664         normify(request, vp, 20);
 665         if (vp->length != 20) {
 666                 RDEBUG("Configured SHA1 password has incorrect length");
 667                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 668                         "rlm_pap: Configured SHA1 password has incorrect length");
 669                 return RLM_MODULE_REJECT;
 670         }
 671
 672         fr_SHA1Init(&sha1_context);
 673         fr_SHA1Update(&sha1_context, request->password->vp_octets,
 674                       request->password->length);
 675         fr_SHA1Final(binbuf,&sha1_context);
 676
 677         if (rad_digest_cmp(binbuf, vp->vp_octets, vp->length) != 0) {
 678                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 679                         "rlm_pap: SHA1 password check failed");
 680                 return RLM_MODULE_REJECT;
 681         }
 682
 683         return RLM_MODULE_OK;
 684 }
 685
 686 static int pap_auth_ssha(REQUEST *request, VALUE_PAIR *vp, char *fmsg)
 687 {
 688         fr_SHA1_CTX sha1_context;
 689         uint8_t binbuf[128];
 690
 691         RDEBUG("Using SSHA encryption.");
 692
 693         normify(request, vp, 20);
 694         if (vp->length <= 20) {
 695                 RDEBUG("Configured SSHA password has incorrect length");
 696                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 697                         "rlm_pap: Configured SHA password has incorrect length");
 698                 return RLM_MODULE_REJECT;
 699         }
 700
 701         fr_SHA1Init(&sha1_context);
 702         fr_SHA1Update(&sha1_context, request->password->vp_octets,
 703                       request->password->length);
 704         fr_SHA1Update(&sha1_context, &vp->vp_octets[20], vp->length - 20);
 705         fr_SHA1Final(binbuf,&sha1_context);
 706
 707         if (rad_digest_cmp(binbuf, vp->vp_octets, 20) != 0) {
 708                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 709                         "rlm_pap: SSHA password check failed");
 710                 return RLM_MODULE_REJECT;
 711         }
 712
 713         return RLM_MODULE_OK;
 714 }
 715
 716 static int pap_auth_nt(REQUEST *request, VALUE_PAIR *vp, char *fmsg)
 717 {
 718         uint8_t binbuf[128];
 719         char charbuf[128];
 720         char buff2[MAX_STRING_LEN + 50];
 721
 722         RDEBUG("Using NT encryption.");
 723
 724         normify(request, vp, 16);
 725         if (vp->length != 16) {
 726                 RDEBUG("Configured NT-Password has incorrect length");
 727                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 728                         "rlm_pap: Configured NT-Password has incorrect length");
 729                 return RLM_MODULE_REJECT;
 730         }
 731
 732         strlcpy(buff2, "%{mschap:NT-Hash %{User-Password}}", sizeof(buff2));
 733         if (!radius_xlat(charbuf, sizeof(charbuf),buff2,request,NULL)){
 734                 RDEBUG("mschap xlat failed");
 735                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 736                         "rlm_pap: mschap xlat failed");
 737                 return RLM_MODULE_REJECT;
 738         }
 739
 740         if ((fr_hex2bin(charbuf, binbuf, 16) != vp->length) ||
 741             (rad_digest_cmp(binbuf, vp->vp_octets, vp->length) != 0)) {
 742                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 743                         "rlm_pap: NT password check failed");
 744                 return RLM_MODULE_REJECT;
 745         }
 746
 747         return RLM_MODULE_OK;
 748 }
 749
 750
 751 static int pap_auth_lm(REQUEST *request, VALUE_PAIR *vp, char *fmsg)
 752 {
 753         uint8_t binbuf[128];
 754         char charbuf[128];
 755         char buff2[MAX_STRING_LEN + 50];
 756
 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(fmsg, sizeof(char[MAX_STRING_LEN]),
 763                         "rlm_pap: Configured LM-Password has incorrect length");
 764                 return RLM_MODULE_REJECT;
 765         }
 766
 767         strlcpy(buff2, "%{mschap:LM-Hash %{User-Password}}", sizeof(buff2));
 768         if (!radius_xlat(charbuf,sizeof(charbuf),buff2,request,NULL)){
 769                 RDEBUG("mschap xlat failed");
 770                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 771                         "rlm_pap: mschap xlat failed");
 772                 return RLM_MODULE_REJECT;
 773         }
 774
 775         if ((fr_hex2bin(charbuf, binbuf, 16) != vp->length) ||
 776             (rad_digest_cmp(binbuf, vp->vp_octets, vp->length) != 0)) {
 777                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 778                         "rlm_pap: LM password check failed");
 779                 return RLM_MODULE_REJECT;
 780         }
 781
 782         return RLM_MODULE_OK;
 783 }
 784
 785 static int pap_auth_ns_mta_md5(REQUEST *request, VALUE_PAIR *vp, char *fmsg)
 786 {
 787         FR_MD5_CTX md5_context;
 788         uint8_t binbuf[128];
 789         uint8_t buff[MAX_STRING_LEN];
 790         char buff2[MAX_STRING_LEN + 50];
 791
 792         RDEBUG("Using NT-MTA-MD5 password");
 793
 794         if (vp->length != 64) {
 795                 RDEBUG("Configured NS-MTA-MD5-Password has incorrect length");
 796                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 797                         "rlm_pap: Configured NS-MTA-MD5-Password has incorrect length");
 798                 return RLM_MODULE_REJECT;
 799         }
 800
 801         /*
 802          *      Sanity check the value of NS-MTA-MD5-Password
 803          */
 804         if (fr_hex2bin(vp->vp_strvalue, binbuf, 32) != 16) {
 805                 RDEBUG("Configured NS-MTA-MD5-Password has invalid value");
 806                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 807                         "rlm_pap: Configured NS-MTA-MD5-Password has invalid value");
 808                 return RLM_MODULE_REJECT;
 809         }
 810
 811         /*
 812          *      Ensure we don't have buffer overflows.
 813          *
 814          *      This really: sizeof(buff) - 2 - 2*32 - strlen(passwd)
 815          */
 816         if (strlen(request->password->vp_strvalue) >= (sizeof(buff) - 2 - 2 * 32)) {
 817                 RDEBUG("Configured password is too long");
 818                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 819                         "rlm_pap: password is too long");
 820                 return RLM_MODULE_REJECT;
 821         }
 822
 823         /*
 824          *      Set up the algorithm.
 825          */
 826         {
 827                 char *p = buff2;
 828
 829                 memcpy(p, &vp->vp_octets[32], 32);
 830                 p += 32;
 831                 *(p++) = 89;
 832                 strcpy(p, request->password->vp_strvalue);
 833                 p += strlen(p);
 834                 *(p++) = 247;
 835                 memcpy(p, &vp->vp_octets[32], 32);
 836                 p += 32;
 837
 838                 fr_MD5Init(&md5_context);
 839                 fr_MD5Update(&md5_context, (uint8_t *) buff2, p - buff2);
 840                 fr_MD5Final(buff, &md5_context);
 841         }
 842
 843         if (rad_digest_cmp(binbuf, buff, 16) != 0) {
 844                 snprintf(fmsg, sizeof(char[MAX_STRING_LEN]),
 845                         "rlm_pap: NS-MTA-MD5 password check failed");
 846                 return RLM_MODULE_REJECT;
 847         }
 848
 849         return RLM_MODULE_OK;
 850 }
 851
 852 /*
 853  *      The module name should be the only globally exported symbol.
 854  *      That is, everything else should be 'static'.
 855  *
 856  *      If the module needs to temporarily modify it's instantiation
 857  *      data, the type should be changed to RLM_TYPE_THREAD_UNSAFE.
 858  *      The server will then take care of ensuring that the module
 859  *      is single-threaded.
 860  */
 861 module_t rlm_pap = {
 862         RLM_MODULE_INIT,
 863         "PAP",
 864         RLM_TYPE_CHECK_CONFIG_SAFE | RLM_TYPE_HUP_SAFE,         /* type */
 865         pap_instantiate,                /* instantiation */
 866         pap_detach,                     /* detach */
 867         {
 868                 pap_authenticate,       /* authentication */
 869                 pap_authorize,          /* authorization */
 870                 NULL,                   /* preaccounting */
 871                 NULL,                   /* accounting */
 872                 NULL,                   /* checksimul */
 873                 NULL,                   /* pre-proxy */
 874                 NULL,                   /* post-proxy */
 875                 NULL                    /* post-auth */
 876         },
 877 };