src/main/valuepair.c

   1 /*
   2  * valuepair.c  Valuepair functions that are radiusd-specific
   3  *              and as such do not belong in the library.
   4  *
   5  * Version:     $Id$
   6  *
   7  *   This program is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License as published by
   9  *   the Free Software Foundation; either version 2 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This program is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with this program; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * Copyright 2000  The FreeRADIUS server project
  22  * Copyright 2000  Alan DeKok <aland@ox.org>
  23  */
  24
  25 static const char rcsid[] = "$Id$";
  26
  27 #include "autoconf.h"
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32
  33 #ifdef HAVE_NETINET_IN_H
  34 #       include <netinet/in.h>
  35 #endif
  36
  37 #ifdef HAVE_REGEX_H
  38 #       include <regex.h>
  39
  40 /*
  41  *  For POSIX Regular expressions.
  42  *  (0) Means no extended regular expressions.
  43  *  REG_EXTENDED means use extended regular expressions.
  44  */
  45 #ifndef REG_EXTENDED
  46 #define REG_EXTENDED (0)
  47 #endif
  48
  49 #ifndef REG_NOSUB
  50 #define REG_NOSUB (0)
  51 #endif
  52 #endif
  53
  54 #include "radiusd.h"
  55
  56 struct cmp {
  57         int attribute;
  58         int otherattr;
  59         void *instance; /* module instance */
  60         RAD_COMPARE_FUNC compare;
  61         struct cmp *next;
  62 };
  63 static struct cmp *cmp;
  64
  65
  66 /*
  67  *      Compare 2 attributes. May call the attribute compare function.
  68  */
  69 static int compare_pair(REQUEST *req, VALUE_PAIR *request, VALUE_PAIR *check,
  70                        VALUE_PAIR *check_pairs, VALUE_PAIR **reply_pairs)
  71 {
  72         int ret = -2;
  73         struct cmp *c;
  74
  75         /*
  76          *      Check for =* and !* and return appropriately
  77          */
  78         if( check->operator == T_OP_CMP_TRUE )
  79                  return 0;  /* always return 0/EQUAL */
  80         if( check->operator == T_OP_CMP_FALSE )
  81                  return 1;  /* always return 1/NOT EQUAL */
  82
  83         /*
  84          *      See if there is a special compare function.
  85          *
  86          *      FIXME: use new RB-Tree code.
  87          */
  88         for (c = cmp; c; c = c->next)
  89                 if (c->attribute == check->attribute)
  90                         return (c->compare)(c->instance, req, request, check,
  91                                 check_pairs, reply_pairs);
  92
  93         if (!request) return -1; /* doesn't exist, don't compare it */
  94
  95         switch(check->type) {
  96 #ifdef ASCEND_BINARY
  97                 /*
  98                  *      Ascend binary attributes can be treated
  99                  *      as opaque objects, I guess...
 100                  */
 101                 case PW_TYPE_ABINARY:
 102 #endif
 103                 case PW_TYPE_OCTETS:
 104                         if (request->length != check->length) {
 105                                 ret = 1; /* NOT equal */
 106                                 break;
 107                         }
 108                         ret = memcmp(request->vp_strvalue, check->vp_strvalue,
 109                                         request->length);
 110                         break;
 111                 case PW_TYPE_STRING:
 112                         if (check->flags.caseless) {
 113                                 ret = strcasecmp((char *)request->vp_strvalue,
 114                                                  (char *)check->vp_strvalue);
 115                         } else {
 116                                 ret = strcmp((char *)request->vp_strvalue,
 117                                              (char *)check->vp_strvalue);
 118                         }
 119                         break;
 120                 case PW_TYPE_INTEGER:
 121                 case PW_TYPE_DATE:
 122                         ret = request->lvalue - check->lvalue;
 123                         break;
 124                 case PW_TYPE_IPADDR:
 125                         ret = ntohl(request->lvalue) - ntohl(check->lvalue);
 126                         break;
 127                 default:
 128                         break;
 129         }
 130
 131         return ret;
 132 }
 133
 134
 135 /*
 136  *      See what attribute we want to compare with.
 137  */
 138 static int otherattr(int attr)
 139 {
 140         struct cmp      *c;
 141
 142         for (c = cmp; c; c = c->next) {
 143                 if (c->attribute == attr)
 144                         return c->otherattr;
 145         }
 146
 147         return attr;
 148 }
 149
 150 /*
 151  *      Register a function as compare function.
 152  *      compare_attr is the attribute in the request we want to
 153  *      compare with. Normally this is the same as "attr".
 154  *      You can set this to:
 155  *
 156  *      -1   the same as "attr"
 157  *      0    always call compare function, not tied to request attribute
 158  *      >0   Attribute to compare with.
 159  *
 160  *      For example, PW_GROUP in a check item needs to be compared
 161  *      with PW_USER_NAME in the incoming request.
 162  */
 163 int paircompare_register(int attr, int compare_attr, RAD_COMPARE_FUNC fun, void *instance)
 164 {
 165         struct cmp      *c;
 166
 167         paircompare_unregister(attr, fun);
 168
 169         c = rad_malloc(sizeof(struct cmp));
 170
 171         if (compare_attr < 0)
 172                 compare_attr = attr;
 173         c->compare = fun;
 174         c->attribute = attr;
 175         c->otherattr = compare_attr;
 176         c->instance = instance;
 177         c->next = cmp;
 178         cmp = c;
 179
 180         return 0;
 181 }
 182
 183 /*
 184  *      Unregister a function.
 185  */
 186 void paircompare_unregister(int attr, RAD_COMPARE_FUNC fun)
 187 {
 188         struct cmp      *c, *last;
 189
 190         last = NULL;
 191         for (c = cmp; c; c = c->next) {
 192                 if (c->attribute == attr && c->compare == fun)
 193                         break;
 194                 last = c;
 195         }
 196
 197         if (c == NULL) return;
 198
 199         if (last != NULL)
 200                 last->next = c->next;
 201         else
 202                 cmp = c->next;
 203
 204         free(c);
 205 }
 206
 207 /*
 208  *      Compare two pair lists except for the password information.
 209  *      For every element in "check" at least one matching copy must
 210  *      be present in "reply".
 211  *
 212  *      Return 0 on match.
 213  */
 214 int paircompare(REQUEST *req, VALUE_PAIR *request, VALUE_PAIR *check, VALUE_PAIR **reply)
 215 {
 216         VALUE_PAIR *check_item;
 217         VALUE_PAIR *auth_item;
 218         int result = 0;
 219         int compare;
 220         int other;
 221 #ifdef HAVE_REGEX_H
 222         regex_t reg;
 223 #endif
 224
 225         for (check_item = check; check_item != NULL; check_item = check_item->next) {
 226                 /*
 227                  *      If the user is setting a configuration value,
 228                  *      then don't bother comparing it to any attributes
 229                  *      sent to us by the user.  It ALWAYS matches.
 230                  */
 231                 if ((check_item->operator == T_OP_SET) ||
 232                     (check_item->operator == T_OP_ADD)) {
 233                         continue;
 234                 }
 235
 236                 switch (check_item->attribute) {
 237                         /*
 238                          *      Attributes we skip during comparison.
 239                          *      These are "server" check items.
 240                          */
 241                         case PW_CRYPT_PASSWORD:
 242                         case PW_AUTH_TYPE:
 243                         case PW_AUTZ_TYPE:
 244                         case PW_ACCT_TYPE:
 245                         case PW_SESSION_TYPE:
 246                         case PW_STRIP_USER_NAME:
 247                                 continue;
 248                                 break;
 249
 250                         /*
 251                          *      IF the password attribute exists, THEN
 252                          *      we can do comparisons against it.  If not,
 253                          *      then the request did NOT contain a
 254                          *      User-Password attribute, so we CANNOT do
 255                          *      comparisons against it.
 256                          *
 257                          *      This hack makes CHAP-Password work..
 258                          */
 259                         case PW_PASSWORD:
 260                                 if (pairfind(request, PW_PASSWORD) == NULL) {
 261                                         continue;
 262                                 }
 263                                 break;
 264                 }
 265
 266                 /*
 267                  *      See if this item is present in the request.
 268                  */
 269                 other = otherattr(check_item->attribute);
 270
 271                 auth_item = request;
 272         try_again:
 273                 for (; auth_item != NULL; auth_item = auth_item->next) {
 274                         if (auth_item->attribute == other || other == 0)
 275                                 break;
 276                 }
 277
 278                 /*
 279                  *      Not found, it's not a match.
 280                  */
 281                 if (auth_item == NULL) {
 282                         /*
 283                          *      Didn't find it.  If we were *trying*
 284                          *      to not find it, then we succeeded.
 285                          */
 286                         if (check_item->operator == T_OP_CMP_FALSE)
 287                                 return 0;
 288                         else
 289                                 return -1;
 290                 }
 291
 292                 /*
 293                  *      Else we found it, but we were trying to not
 294                  *      find it, so we failed.
 295                  */
 296                 if (check_item->operator == T_OP_CMP_FALSE)
 297                         return -1;
 298
 299
 300                 /*
 301                  *      We've got to xlat the string before doing
 302                  *      the comparison.
 303                  */
 304                 if (check_item->flags.do_xlat) {
 305                         int rcode;
 306                         char buffer[sizeof(check_item->vp_strvalue)];
 307
 308                         check_item->flags.do_xlat = 0;
 309                         rcode = radius_xlat(buffer, sizeof(buffer),
 310                                             check_item->vp_strvalue,
 311                                             req, NULL);
 312
 313                         /*
 314                          *      Parse the string into a new value.
 315                          */
 316                         pairparsevalue(check_item, buffer);
 317                 }
 318
 319                 /*
 320                  *      OK it is present now compare them.
 321                  */
 322                 compare = compare_pair(req, auth_item, check_item, check, reply);
 323
 324                 switch (check_item->operator) {
 325                         case T_OP_EQ:
 326                         default:
 327                                 radlog(L_INFO,  "Invalid operator for item %s: "
 328                                                 "reverting to '=='", check_item->name);
 329                                 /*FALLTHRU*/
 330                         case T_OP_CMP_TRUE:    /* compare always == 0 */
 331                         case T_OP_CMP_FALSE:   /* compare always == 1 */
 332                         case T_OP_CMP_EQ:
 333                                 if (compare != 0) result = -1;
 334                                 break;
 335
 336                         case T_OP_NE:
 337                                 if (compare == 0) result = -1;
 338                                 break;
 339
 340                         case T_OP_LT:
 341                                 if (compare >= 0) result = -1;
 342                                 break;
 343
 344                         case T_OP_GT:
 345                                 if (compare <= 0) result = -1;
 346                                 break;
 347
 348                         case T_OP_LE:
 349                                 if (compare > 0) result = -1;
 350                                 break;
 351
 352                         case T_OP_GE:
 353                                 if (compare < 0) result = -1;
 354                                 break;
 355
 356 #ifdef HAVE_REGEX_H
 357                         case T_OP_REG_EQ:
 358                         {
 359                                 int i;
 360                                 regmatch_t rxmatch[REQUEST_MAX_REGEX + 1];
 361
 362                                 if ((auth_item->type == PW_TYPE_IPADDR) &&
 363                                     (auth_item->vp_strvalue[0] == '\0')) {
 364                                   inet_ntop(AF_INET, &(auth_item->lvalue),
 365                                             auth_item->vp_strvalue,
 366                                             sizeof(auth_item->vp_strvalue));
 367                                 }
 368
 369                                 /*
 370                                  *      Include substring matches.
 371                                  */
 372                                 regcomp(&reg, (char *)check_item->vp_strvalue,
 373                                         REG_EXTENDED);
 374                                 compare = regexec(&reg,
 375                                                   (char *)auth_item->vp_strvalue,
 376                                                   REQUEST_MAX_REGEX + 1,
 377                                                   rxmatch, 0);
 378                                 regfree(&reg);
 379
 380                                 /*
 381                                  *      Add %{0}, %{1}, etc.
 382                                  */
 383                                 for (i = 0; i <= REQUEST_MAX_REGEX; i++) {
 384                                         char *p;
 385                                         char buffer[sizeof(check_item->vp_strvalue)];
 386
 387                                         /*
 388                                          *      Didn't match: delete old
 389                                          *      match, if it existed.
 390                                          */
 391                                         if ((compare != 0) ||
 392                                             (rxmatch[i].rm_so == -1)) {
 393                                                 p = request_data_get(req, req,
 394                                                                      REQUEST_DATA_REGEX | i);
 395                                                 if (p) {
 396                                                         free(p);
 397                                                         continue;
 398                                                 }
 399
 400                                                 /*
 401                                                  *      No previous match
 402                                                  *      to delete, stop.
 403                                                  */
 404                                                 break;
 405                                         }
 406
 407                                         /*
 408                                          *      Copy substring into buffer.
 409                                          */
 410                                         memcpy(buffer,
 411                                                auth_item->vp_strvalue + rxmatch[i].rm_so,
 412                                                rxmatch[i].rm_eo - rxmatch[i].rm_so);
 413                                         buffer[rxmatch[i].rm_eo - rxmatch[i].rm_so] = '\0';
 414
 415                                         /*
 416                                          *      Copy substring, and add it to
 417                                          *      the request.
 418                                          *
 419                                          *      Note that we don't check
 420                                          *      for out of memory, which is
 421                                          *      the only error we can get...
 422                                          */
 423                                         p = strdup(buffer);
 424                                         request_data_add(req,
 425                                                          req,
 426                                                          REQUEST_DATA_REGEX | i,
 427                                                          p, free);
 428                                 }
 429                         }
 430                                 if (compare != 0) result = -1;
 431                                 break;
 432
 433                         case T_OP_REG_NE:
 434                                 if ((auth_item->type == PW_TYPE_IPADDR) &&
 435                                     (auth_item->vp_strvalue[0] == '\0')) {
 436                                   inet_ntop(AF_INET, &(auth_item->lvalue),
 437                                             auth_item->vp_strvalue,
 438                                             sizeof(auth_item->vp_strvalue));
 439                                 }
 440
 441                                 regcomp(&reg, (char *)check_item->vp_strvalue, REG_EXTENDED|REG_NOSUB);
 442                                 compare = regexec(&reg, (char *)auth_item->vp_strvalue,
 443                                                 0, NULL, 0);
 444                                 regfree(&reg);
 445                                 if (compare == 0) result = -1;
 446                                 break;
 447 #endif
 448
 449                 } /* switch over the operator of the check item */
 450
 451                 /*
 452                  *      This attribute didn't match, but maybe there's
 453                  *      another of the same attribute, which DOES match.
 454                  */
 455                 if (result != 0) {
 456                         auth_item = auth_item->next;
 457                         result = 0;
 458                         goto try_again;
 459                 }
 460
 461         } /* for every entry in the check item list */
 462
 463         return 0;               /* it matched */
 464 }
 465
 466 /*
 467  *      Compare two attributes simply.  Calls compare_pair.
 468  */
 469
 470 int simplepaircmp(REQUEST *req, VALUE_PAIR *first, VALUE_PAIR *second)
 471 {
 472         return compare_pair( req, first, second, NULL, NULL );
 473 }
 474
 475
 476 /*
 477  *      Move pairs, replacing/over-writing them, and doing xlat.
 478  */
 479 /*
 480  *      Move attributes from one list to the other
 481  *      if not already present.
 482  */
 483 void pairxlatmove(REQUEST *req, VALUE_PAIR **to, VALUE_PAIR **from)
 484 {
 485         VALUE_PAIR **tailto, *i, *j, *next;
 486         VALUE_PAIR *tailfrom = NULL;
 487         VALUE_PAIR *found;
 488
 489         /*
 490          *      Point "tailto" to the end of the "to" list.
 491          */
 492         tailto = to;
 493         for(i = *to; i; i = i->next) {
 494                 tailto = &i->next;
 495         }
 496
 497         /*
 498          *      Loop over the "from" list.
 499          */
 500         for(i = *from; i; i = next) {
 501                 next = i->next;
 502
 503                 /*
 504                  *      Don't move 'fallthrough' over.
 505                  */
 506                 if (i->attribute == PW_FALL_THROUGH) {
 507                         continue;
 508                 }
 509
 510                 /*
 511                  *      We've got to xlat the string before moving
 512                  *      it over.
 513                  */
 514                 if (i->flags.do_xlat) {
 515                         int rcode;
 516                         char buffer[sizeof(i->vp_strvalue)];
 517
 518                         i->flags.do_xlat = 0;
 519                         rcode = radius_xlat(buffer, sizeof(buffer),
 520                                             i->vp_strvalue,
 521                                             req, NULL);
 522
 523                         /*
 524                          *      Parse the string into a new value.
 525                          */
 526                         pairparsevalue(i, buffer);
 527                 }
 528
 529                 found = pairfind(*to, i->attribute);
 530                 switch (i->operator) {
 531
 532                         /*
 533                          *  If a similar attribute is found,
 534                          *  delete it.
 535                          */
 536                 case T_OP_SUB:          /* -= */
 537                         if (found) {
 538                                 if (!i->vp_strvalue[0] ||
 539                                     (strcmp((char *)found->vp_strvalue,
 540                                             (char *)i->vp_strvalue) == 0)){
 541                                         pairdelete(to, found->attribute);
 542
 543                                         /*
 544                                          *      'tailto' may have been
 545                                          *      deleted...
 546                                          */
 547                                         tailto = to;
 548                                         for(j = *to; j; j = j->next) {
 549                                                 tailto = &j->next;
 550                                         }
 551                                 }
 552                         }
 553                         tailfrom = i;
 554                         continue;
 555                         break;
 556
 557                         /*
 558                          *  Add it, if it's not already there.
 559                          */
 560                 case T_OP_EQ:           /* = */
 561                         if (found) {
 562                                 tailfrom = i;
 563                                 continue; /* with the loop */
 564                         }
 565                         break;
 566
 567                         /*
 568                          *  If a similar attribute is found,
 569                          *  replace it with the new one.  Otherwise,
 570                          *  add the new one to the list.
 571                          */
 572                 case T_OP_SET:          /* := */
 573                         if (found) {
 574                                 VALUE_PAIR *vp;
 575
 576                                 vp = found->next;
 577                                 memcpy(found, i, sizeof(*found));
 578                                 found->next = vp;
 579                                 continue;
 580                         }
 581                         break;
 582
 583                         /*
 584                          *  FIXME: Add support for <=, >=, <, >
 585                          *
 586                          *  which will mean (for integers)
 587                          *  'make the attribute the smaller, etc'
 588                          */
 589
 590                         /*
 591                          *  Add the new element to the list, even
 592                          *  if similar ones already exist.
 593                          */
 594                 default:
 595                 case T_OP_ADD:          /* += */
 596                         break;
 597                 }
 598
 599                 if (tailfrom)
 600                         tailfrom->next = next;
 601                 else
 602                         *from = next;
 603
 604                 /*
 605                  *      If ALL of the 'to' attributes have been deleted,
 606                  *      then ensure that the 'tail' is updated to point
 607                  *      to the head.
 608                  */
 609                 if (!*to) {
 610                         tailto = to;
 611                 }
 612                 *tailto = i;
 613                 if (i) {
 614                         i->next = NULL;
 615                         tailto = &i->next;
 616                 }
 617         } /* loop over the 'from' list */
 618 }