git.sur5r.net Git - openldap/blob - servers/slapd/overlays/constraint.c

   1 /* $OpenLDAP$ */
   2 /* constraint.c - Overlay to constrain attributes to certain values */
   3 /*
   4  * Copyright 2003-2004 Hewlett-Packard Company
   5  * Copyright 2007 Emmanuel Dreyfus
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /*
  17  * Authors: Neil Dunbar <neil.dunbar@hp.com>
  18  *                      Emmannuel Dreyfus <manu@netbsd.org>
  19  */
  20 #include "portable.h"
  21
  22 #ifdef SLAPD_OVER_CONSTRAINT
  23
  24 #include <stdio.h>
  25
  26 #include <ac/string.h>
  27 #include <ac/socket.h>
  28 #include <ac/regex.h>
  29
  30 #include "lutil.h"
  31 #include "slap.h"
  32 #include "config.h"
  33
  34 /*
  35  * This overlay limits the values which can be placed into an
  36  * attribute, over and above the limits placed by the schema.
  37  *
  38  * It traps only LDAP adds and modify commands (and only seeks to
  39  * control the add and modify value mods of a modify)
  40  */
  41
  42 #define REGEX_STR "regex"
  43 #define URI_STR "uri"
  44 #define SIZE_STR "size"
  45 #define COUNT_STR "count"
  46
  47 /*
  48  * Linked list of attribute constraints which we should enforce.
  49  * This is probably a sub optimal structure - some form of sorted
  50  * array would be better if the number of attributes contrained is
  51  * likely to be much bigger than 4 or 5. We stick with a list for
  52  * the moment.
  53  */
  54
  55 typedef struct constraint {
  56         struct constraint *ap_next;
  57         AttributeDescription *ap;
  58         regex_t *re;
  59         LDAPURLDesc *lud;
  60         size_t size;
  61         size_t count;
  62         AttributeDescription **attrs;
  63         struct berval val; /* constraint value */
  64         struct berval dn;
  65         struct berval filter;
  66 } constraint;
  67
  68 enum {
  69         CONSTRAINT_ATTRIBUTE = 1
  70 };
  71
  72 static ConfigDriver constraint_cf_gen;
  73
  74 static ConfigTable constraintcfg[] = {
  75         { "constraint_attribute", "attribute> (regex|uri) <value",
  76           4, 4, 0, ARG_MAGIC | CONSTRAINT_ATTRIBUTE, constraint_cf_gen,
  77           "( OLcfgOvAt:13.1 NAME 'olcConstraintAttribute' "
  78           "DESC 'regular expression constraint for attribute' "
  79           "EQUALITY caseIgnoreMatch "
  80           "SYNTAX OMsDirectoryString )", NULL, NULL },
  81         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
  82 };
  83
  84 static ConfigOCs constraintocs[] = {
  85         { "( OLcfgOvOc:13.1 "
  86           "NAME 'olcConstraintConfig' "
  87           "DESC 'Constraint overlay configuration' "
  88           "SUP olcOverlayConfig "
  89           "MAY ( olcConstraintAttribute ) )",
  90           Cft_Overlay, constraintcfg },
  91         { NULL, 0, NULL }
  92 };
  93
  94 static void
  95 constraint_free( constraint *cp )
  96 {
  97         if (cp->re) {
  98                 regfree(cp->re);
  99                 ch_free(cp->re);
 100         }
 101         if (!BER_BVISNULL(&cp->val))
 102                 ch_free(cp->val.bv_val);
 103         if (cp->lud)
 104                 ldap_free_urldesc(cp->lud);
 105         if (cp->attrs)
 106                 ch_free(cp->attrs);
 107         ch_free(cp);
 108 }
 109
 110 static int
 111 constraint_cf_gen( ConfigArgs *c )
 112 {
 113         slap_overinst *on = (slap_overinst *)(c->bi);
 114         constraint *cn = on->on_bi.bi_private, *cp;
 115         struct berval bv;
 116         int i, rc = 0;
 117         constraint ap = { NULL, NULL, NULL      }, *a2 = NULL;
 118         const char *text = NULL;
 119
 120         switch ( c->op ) {
 121         case SLAP_CONFIG_EMIT:
 122                 switch (c->type) {
 123                 case CONSTRAINT_ATTRIBUTE:
 124                         for (cp=cn; cp; cp=cp->ap_next) {
 125                                 int len;
 126                                 char *s;
 127                                 char *tstr = NULL;
 128
 129                                 len = cp->ap->ad_cname.bv_len + 3;
 130                                 if (cp->re) {
 131                                         len += STRLENOF(REGEX_STR);
 132                                         tstr = REGEX_STR;
 133                                 } else if (cp->lud) {
 134                                         len += STRLENOF(URI_STR);
 135                                         tstr = URI_STR;
 136                                 } else if (cp->size) {
 137                                         len += STRLENOF(SIZE_STR);
 138                                         tstr = SIZE_STR;
 139                                 } else if (cp->count) {
 140                                         len += STRLENOF(COUNT_STR);
 141                                         tstr = COUNT_STR;
 142                                 }
 143                                 len += cp->val.bv_len;
 144
 145                                 s = ch_malloc(len);
 146
 147                                 bv.bv_len = snprintf(s, len, "%s %s %s", cp->ap->ad_cname.bv_val,
 148                                                  tstr, cp->val.bv_val);
 149                                 bv.bv_val = s;
 150                                 rc = value_add_one( &c->rvalue_vals, &bv );
 151                                 if (rc) return rc;
 152                                 rc = value_add_one( &c->rvalue_nvals, &bv );
 153                                 if (rc) return rc;
 154                                 ch_free(s);
 155                         }
 156                         break;
 157                 default:
 158                         abort();
 159                         break;
 160                 }
 161                 break;
 162         case LDAP_MOD_DELETE:
 163                 switch (c->type) {
 164                 case CONSTRAINT_ATTRIBUTE:
 165                         if (!cn) break; /* nothing to do */
 166
 167                         if (c->valx < 0) {
 168                                 /* zap all constraints */
 169                                 while (cn) {
 170                                         cp = cn->ap_next;
 171                                         constraint_free( cn );
 172                                         cn = cp;
 173                                 }
 174
 175                                 on->on_bi.bi_private = NULL;
 176                         } else {
 177                                 constraint **cpp;
 178
 179                                 /* zap constraint numbered 'valx' */
 180                                 for(i=0, cp = cn, cpp = &cn;
 181                                         (cp) && (i<c->valx);
 182                                         i++, cpp = &cp->ap_next, cp = *cpp);
 183
 184                                 if (cp) {
 185                                         /* zap cp, and join cpp to cp->ap_next */
 186                                         *cpp = cp->ap_next;
 187                                         constraint_free( cp );
 188                                 }
 189                                 on->on_bi.bi_private = cn;
 190                         }
 191                         break;
 192
 193                 default:
 194                         abort();
 195                         break;
 196                 }
 197                 break;
 198         case SLAP_CONFIG_ADD:
 199         case LDAP_MOD_ADD:
 200                 switch (c->type) {
 201                 case CONSTRAINT_ATTRIBUTE:
 202                         if ( slap_str2ad( c->argv[1], &ap.ap, &text ) ) {
 203                                 snprintf( c->cr_msg, sizeof( c->cr_msg ),
 204                                         "%s <%s>: %s\n", c->argv[0], c->argv[1], text );
 205                                 Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
 206                                            "%s: %s\n", c->log, c->cr_msg, 0 );
 207                                 return( ARG_BAD_CONF );
 208                         }
 209
 210                         if ( strcasecmp( c->argv[2], REGEX_STR ) == 0) {
 211                                 int err;
 212
 213                                 ap.re = ch_malloc( sizeof(regex_t) );
 214                                 if ((err = regcomp( ap.re,
 215                                         c->argv[3], REG_EXTENDED )) != 0) {
 216                                         char errmsg[1024];
 217
 218                                         regerror( err, ap.re, errmsg, sizeof(errmsg) );
 219                                         ch_free(ap.re);
 220                                         snprintf( c->cr_msg, sizeof( c->cr_msg ),
 221                                            "%s %s: Illegal regular expression \"%s\": Error %s",
 222                                            c->argv[0], c->argv[1], c->argv[3], errmsg);
 223                                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
 224                                                 "%s: %s\n", c->log, c->cr_msg, 0 );
 225                                         ap.re = NULL;
 226                                         return( ARG_BAD_CONF );
 227                                 }
 228                                 ber_str2bv( c->argv[3], 0, 1, &ap.val );
 229                         } else if ( strcasecmp( c->argv[2], SIZE_STR ) == 0 ) {
 230                                 size_t size;
 231
 232                                 if ( ( size = atoi(c->argv[3]) ) != 0 )
 233                                         ap.size = size;
 234                         } else if ( strcasecmp( c->argv[2], COUNT_STR ) == 0 ) {
 235                                 size_t count;
 236
 237                                 if ( ( count = atoi(c->argv[3]) ) != 0 )
 238                                         ap.count = count;
 239                         } else if ( strcasecmp( c->argv[2], URI_STR ) == 0 ) {
 240                                 int err;
 241
 242                                 err = ldap_url_parse(c->argv[3], &ap.lud);
 243                                 if ( err != LDAP_URL_SUCCESS ) {
 244                                         snprintf( c->cr_msg, sizeof( c->cr_msg ),
 245                                                 "%s %s: Invalid URI \"%s\"",
 246                                                 c->argv[0], c->argv[1], c->argv[3]);
 247                                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
 248                                                 "%s: %s\n", c->log, c->cr_msg, 0 );
 249                                         return( ARG_BAD_CONF );
 250                                 }
 251
 252                                 if (ap.lud->lud_host != NULL) {
 253                                         snprintf( c->cr_msg, sizeof( c->cr_msg ),
 254                                                 "%s %s: unsupported hostname in URI \"%s\"",
 255                                                 c->argv[0], c->argv[1], c->argv[3]);
 256                                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
 257                                                 "%s: %s\n", c->log, c->cr_msg, 0 );
 258
 259                                         ldap_free_urldesc(ap.lud);
 260
 261                                         return( ARG_BAD_CONF );
 262                                 }
 263
 264                                 for ( i=0; ap.lud->lud_attrs[i]; i++);
 265                                 /* FIXME: This is worthless without at least one attr */
 266                                 if ( i ) {
 267                                         ap.attrs = ch_malloc( (i+1)*sizeof(AttributeDescription *));
 268                                         for ( i=0; ap.lud->lud_attrs[i]; i++) {
 269                                                 ap.attrs[i] = NULL;
 270                                                 if ( slap_str2ad( ap.lud->lud_attrs[i], &ap.attrs[i], &text ) ) {
 271                                                         ch_free( ap.attrs );
 272                                                         snprintf( c->cr_msg, sizeof( c->cr_msg ),
 273                                                                 "%s <%s>: %s\n", c->argv[0], ap.lud->lud_attrs[i], text );
 274                                                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
 275                                                                    "%s: %s\n", c->log, c->cr_msg, 0 );
 276                                                         return( ARG_BAD_CONF );
 277                                                 }
 278                                         }
 279                                         ap.attrs[i] = NULL;
 280                                 }
 281
 282                                 if (ap.lud->lud_dn == NULL)
 283                                         ap.lud->lud_dn = ch_strdup("");
 284
 285                                 if (ap.lud->lud_filter == NULL)
 286                                         ap.lud->lud_filter = ch_strdup("objectClass=*");
 287
 288                                 ber_str2bv( c->argv[3], 0, 1, &ap.val );
 289                         } else {
 290                                 snprintf( c->cr_msg, sizeof( c->cr_msg ),
 291                                    "%s %s: Unknown constraint type: %s",
 292                                    c->argv[0], c->argv[1], c->argv[2] );
 293                                 Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
 294                                    "%s: %s\n", c->log, c->cr_msg, 0 );
 295                                 return ( ARG_BAD_CONF );
 296                         }
 297
 298                         a2 = ch_calloc( sizeof(constraint), 1 );
 299                         a2->ap_next = on->on_bi.bi_private;
 300                         a2->ap = ap.ap;
 301                         a2->re = ap.re;
 302                         a2->val = ap.val;
 303                         a2->lud = ap.lud;
 304                         a2->size = ap.size;
 305                         a2->count = ap.count;
 306                         if ( a2->lud ) {
 307                                 ber_str2bv(a2->lud->lud_dn, 0, 0, &a2->dn);
 308                                 ber_str2bv(a2->lud->lud_filter, 0, 0, &a2->filter);
 309                         }
 310                         a2->attrs = ap.attrs;
 311                         on->on_bi.bi_private = a2;
 312                         break;
 313                 default:
 314                         abort();
 315                         break;
 316                 }
 317                 break;
 318         default:
 319                 abort();
 320         }
 321
 322         return rc;
 323 }
 324
 325 static int
 326 constraint_uri_cb( Operation *op, SlapReply *rs )
 327 {
 328         if(rs->sr_type == REP_SEARCH) {
 329                 int *foundp = op->o_callback->sc_private;
 330
 331                 *foundp = 1;
 332
 333                 Debug(LDAP_DEBUG_TRACE, "==> constraint_uri_cb <%s>\n",
 334                         rs->sr_entry ? rs->sr_entry->e_name.bv_val : "UNKNOWN_DN", 0, 0);
 335         }
 336         return 0;
 337 }
 338
 339 static int
 340 constraint_violation( constraint *c, struct berval *bv, Operation *op, SlapReply *rs)
 341 {
 342         if ((!c) || (!bv)) return 0;
 343
 344         if ((c->re) &&
 345                 (regexec(c->re, bv->bv_val, 0, NULL, 0) == REG_NOMATCH))
 346                 return 1; /* regular expression violation */
 347
 348         if ((c->size) && (bv->bv_len > c->size))
 349                 return 1; /* size violation */
 350
 351         if (c->lud) {
 352                 Operation nop = *op;
 353                 slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 354                 slap_callback cb;
 355                 SlapReply nrs = { REP_RESULT };
 356                 int i;
 357                 int found;
 358                 int rc;
 359                 size_t len;
 360                 struct berval filterstr;
 361                 char *ptr;
 362
 363                 found = 0;
 364
 365                 nrs.sr_entry = NULL;
 366                 nrs.sr_nentries = 0;
 367
 368                 cb.sc_next = NULL;
 369                 cb.sc_response = constraint_uri_cb;
 370                 cb.sc_cleanup = NULL;
 371                 cb.sc_private = &found;
 372
 373                 nop.o_protocol = LDAP_VERSION3;
 374                 nop.o_tag = LDAP_REQ_SEARCH;
 375                 nop.o_time = slap_get_time();
 376                 if (c->lud->lud_dn) {
 377                         struct berval dn;
 378
 379                         ber_str2bv(c->lud->lud_dn, 0, 0, &dn);
 380                         nop.o_req_dn = dn;
 381                         nop.o_req_ndn = dn;
 382                         nop.o_bd = select_backend(&nop.o_req_ndn, 1 );
 383                         if (!nop.o_bd || !nop.o_bd->be_search) {
 384                                 return 1; /* unexpected error */
 385                         }
 386                 } else {
 387                         nop.o_req_dn = nop.o_bd->be_nsuffix[0];
 388                         nop.o_req_ndn = nop.o_bd->be_nsuffix[0];
 389                         nop.o_bd = on->on_info->oi_origdb;
 390                 }
 391                 nop.o_do_not_cache = 1;
 392                 nop.o_callback = &cb;
 393
 394                 nop.ors_scope = c->lud->lud_scope;
 395                 nop.ors_deref = LDAP_DEREF_NEVER;
 396                 nop.ors_slimit = SLAP_NO_LIMIT;
 397                 nop.ors_tlimit = SLAP_NO_LIMIT;
 398                 nop.ors_limit = NULL;
 399
 400                 nop.ors_attrsonly = 0;
 401                 nop.ors_attrs = slap_anlist_no_attrs;
 402
 403                 len = STRLENOF("(&(") +
 404                           c->filter.bv_len +
 405                           STRLENOF(")(|");
 406
 407                 for (i = 0; c->attrs[i]; i++) {
 408                         len += STRLENOF("(") +
 409                                    c->attrs[i]->ad_cname.bv_len +
 410                                    STRLENOF("=") +
 411                                    bv->bv_len +
 412                                    STRLENOF(")");
 413                 }
 414
 415                 len += STRLENOF("))");
 416                 filterstr.bv_len = len;
 417                 filterstr.bv_val = op->o_tmpalloc(len + 1, op->o_tmpmemctx);
 418
 419                 ptr = filterstr.bv_val +
 420                         snprintf(filterstr.bv_val, len, "(&(%s)(|", c->lud->lud_filter);
 421                 for (i = 0; c->attrs[i]; i++) {
 422                         *ptr++ = '(';
 423                         ptr = lutil_strcopy( ptr, c->attrs[i]->ad_cname.bv_val );
 424                         *ptr++ = '=';
 425                         ptr = lutil_strcopy( ptr, bv->bv_val );
 426                         *ptr++ = ')';
 427                 }
 428                 *ptr++ = ')';
 429                 *ptr++ = ')';
 430
 431                 Debug(LDAP_DEBUG_TRACE,
 432                         "==> constraint_violation uri filter = %s\n",
 433                         filterstr.bv_val, 0, 0);
 434
 435                 nop.ors_filterstr = filterstr;
 436                 nop.ors_filter = str2filter_x(&nop, filterstr.bv_val);
 437
 438                 rc = nop.o_bd->be_search( &nop, &nrs );
 439
 440                 op->o_tmpfree(filterstr.bv_val, op->o_tmpmemctx);
 441                 Debug(LDAP_DEBUG_TRACE,
 442                         "==> constraint_violation uri rc = %d, found = %d\n",
 443                         rc, found, 0);
 444
 445                 if((rc != LDAP_SUCCESS) && (rc != LDAP_NO_SUCH_OBJECT)) {
 446                         send_ldap_error(op, rs, rc,
 447                                 "constraint_violation uri search failed");
 448                         return 1; /* unexpected error */
 449                 }
 450
 451                 if (!found)
 452                         return 1; /* constraint violation */
 453
 454         }
 455
 456         return 0;
 457 }
 458
 459 static char *
 460 print_message( struct berval *errtext, AttributeDescription *a )
 461 {
 462         char *ret;
 463         int sz;
 464
 465         sz = errtext->bv_len + sizeof(" on ") + a->ad_cname.bv_len;
 466         ret = ch_malloc(sz);
 467         snprintf( ret, sz, "%s on %s", errtext->bv_val, a->ad_cname.bv_val );
 468         return ret;
 469 }
 470
 471 static unsigned
 472 constraint_count_attr(Entry *e, AttributeDescription *ad)
 473 {
 474         struct Attribute *a;
 475
 476         if ((a = attr_find(e->e_attrs, ad)) != NULL)
 477                 return a->a_numvals;
 478         return 0;
 479 }
 480
 481 static int
 482 constraint_add( Operation *op, SlapReply *rs )
 483 {
 484         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 485         Backend *be = op->o_bd;
 486         Attribute *a;
 487         constraint *c = on->on_bi.bi_private, *cp;
 488         BerVarray b = NULL;
 489         int i;
 490         struct berval rsv = BER_BVC("add breaks constraint");
 491         char *msg;
 492
 493         if ((a = op->ora_e->e_attrs) == NULL) {
 494                 op->o_bd->bd_info = (BackendInfo *)(on->on_info);
 495                 send_ldap_error(op, rs, LDAP_INVALID_SYNTAX,
 496                         "constraint_add() got null op.ora_e.e_attrs");
 497                 return(rs->sr_err);
 498         }
 499
 500         for(; a; a = a->a_next ) {
 501                 /* we don't constrain operational attributes */
 502                 if (is_at_operational(a->a_desc->ad_type)) continue;
 503
 504                 for(cp = c; cp; cp = cp->ap_next) {
 505                         if (cp->ap != a->a_desc) continue;
 506                         if ((b = a->a_vals) == NULL) continue;
 507
 508                         Debug(LDAP_DEBUG_TRACE,
 509                                 "==> constraint_add, "
 510                                 "a->a_numvals = %d, cp->count = %d\n",
 511                                 a->a_numvals, cp->count, 0);
 512
 513                         if ((cp->count != 0) && (a->a_numvals > cp->count))
 514                                 goto add_violation;
 515
 516                         for(i=0; b[i].bv_val; i++)
 517                                 if (constraint_violation( cp, &b[i], op, rs))
 518                                         goto add_violation;
 519                 }
 520         }
 521         /* Default is to just fall through to the normal processing */
 522         return SLAP_CB_CONTINUE;
 523
 524 add_violation:
 525         op->o_bd->bd_info = (BackendInfo *)(on->on_info);
 526         msg = print_message( &rsv, a->a_desc );
 527         send_ldap_error(op, rs, LDAP_CONSTRAINT_VIOLATION, msg );
 528         ch_free(msg);
 529         return (rs->sr_err);
 530 }
 531
 532
 533 static int
 534 constraint_modify( Operation *op, SlapReply *rs )
 535 {
 536         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 537         Backend *be = op->o_bd;
 538         constraint *c = on->on_bi.bi_private, *cp;
 539         Entry *target_entry = NULL;
 540         Modifications *m;
 541         BerVarray b = NULL;
 542         int i;
 543         struct berval rsv = BER_BVC("modify breaks constraint");
 544         char *msg;
 545
 546         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE, "constraint_modify()", 0,0,0);
 547         if ((m = op->orm_modlist) == NULL) {
 548                 op->o_bd->bd_info = (BackendInfo *)(on->on_info);
 549                 send_ldap_error(op, rs, LDAP_INVALID_SYNTAX,
 550                                                 "constraint_modify() got null orm_modlist");
 551                 return(rs->sr_err);
 552         }
 553
 554         /* Do we need to count attributes? */
 555         for(cp = c; cp; cp = cp->ap_next) {
 556                 if (cp->count != 0) {
 557                         int rc;
 558
 559                         op->o_bd = on->on_info->oi_origdb;
 560                         rc = be_entry_get_rw( op, &op->o_req_ndn, NULL, NULL, 0, &target_entry );
 561                         op->o_bd = be;
 562
 563                         if (rc != 0 || target_entry == NULL) {
 564                                 Debug(LDAP_DEBUG_TRACE,
 565                                         "==> constraint_modify rc = %d\n",
 566                                         rc, 0, 0);
 567                                 goto mod_violation;
 568                         }
 569                         break;
 570                 }
 571         }
 572
 573         for(;m; m = m->sml_next) {
 574                 int ce = 0;
 575
 576                 /* Get this attribute count, if needed */
 577                 if (target_entry)
 578                         ce = constraint_count_attr(target_entry, m->sml_desc);
 579
 580                 if (is_at_operational( m->sml_desc->ad_type )) continue;
 581                 if ((( m->sml_op & LDAP_MOD_OP ) != LDAP_MOD_ADD) &&
 582                         (( m->sml_op & LDAP_MOD_OP ) != LDAP_MOD_REPLACE) &&
 583                         (( m->sml_op & LDAP_MOD_OP ) != LDAP_MOD_DELETE))
 584                         continue;
 585                 /* we only care about ADD and REPLACE modifications */
 586                 /* and DELETE are used to track attribute count */
 587                 if ((( b = m->sml_values ) == NULL ) || (b[0].bv_val == NULL))
 588                         continue;
 589
 590                 for(cp = c; cp; cp = cp->ap_next) {
 591                         if (cp->ap != m->sml_desc) continue;
 592
 593                         if (cp->count != 0) {
 594                                 int ca;
 595
 596                                 if (m->sml_op == LDAP_MOD_DELETE)
 597                                         ce = 0;
 598
 599                                 for (ca = 0; b[ca].bv_val; ++ca);
 600
 601                                 Debug(LDAP_DEBUG_TRACE,
 602                                         "==> constraint_modify ce = %d, "
 603                                         "ca = %d, cp->count = %d\n",
 604                                         ce, ca, cp->count);
 605
 606                                 if (m->sml_op == LDAP_MOD_ADD)
 607                                         if (ca + ce > cp->count)
 608                                                 goto mod_violation;
 609                                 if (m->sml_op == LDAP_MOD_REPLACE) {
 610                                         if (ca > cp->count)
 611                                                 goto mod_violation;
 612                                         ce = ca;
 613                                 }
 614                         }
 615
 616                         /* DELETE are to be ignored beyond this point */
 617                         if (( m->sml_op & LDAP_MOD_OP ) == LDAP_MOD_DELETE)
 618                                 continue;
 619
 620                         for(i=0; b[i].bv_val; i++)
 621                                 if (constraint_violation( cp, &b[i], op, rs))
 622                                         goto mod_violation;
 623                 }
 624         }
 625
 626         if (target_entry) {
 627                 op->o_bd = on->on_info->oi_origdb;
 628                 be_entry_release_r(op, target_entry);
 629                 op->o_bd = be;
 630         }
 631         return SLAP_CB_CONTINUE;
 632 mod_violation:
 633         /* violation */
 634         if (target_entry) {
 635                 op->o_bd = on->on_info->oi_origdb;
 636                 be_entry_release_r(op, target_entry);
 637                 op->o_bd = be;
 638         }
 639         op->o_bd->bd_info = (BackendInfo *)(on->on_info);
 640         msg = print_message( &rsv, m->sml_desc );
 641         send_ldap_error(op, rs, LDAP_CONSTRAINT_VIOLATION, msg );
 642         ch_free(msg);
 643         return (rs->sr_err);
 644 }
 645
 646 static int
 647 constraint_close(
 648         BackendDB *be,
 649         ConfigReply *cr )
 650 {
 651         slap_overinst *on = (slap_overinst *) be->bd_info;
 652         constraint *ap, *a2;
 653
 654         for ( ap = on->on_bi.bi_private; ap; ap = a2 ) {
 655                 a2 = ap->ap_next;
 656                 constraint_free( ap );
 657         }
 658
 659         return 0;
 660 }
 661
 662 static slap_overinst constraint_ovl;
 663
 664 #if SLAPD_OVER_CONSTRAINT == SLAPD_MOD_DYNAMIC
 665 static
 666 #endif
 667 int
 668 constraint_initialize( void ) {
 669         int rc;
 670
 671         constraint_ovl.on_bi.bi_type = "constraint";
 672         constraint_ovl.on_bi.bi_db_close = constraint_close;
 673         constraint_ovl.on_bi.bi_op_add = constraint_add;
 674         constraint_ovl.on_bi.bi_op_modify = constraint_modify;
 675
 676         constraint_ovl.on_bi.bi_private = NULL;
 677
 678         constraint_ovl.on_bi.bi_cf_ocs = constraintocs;
 679         rc = config_register_schema( constraintcfg, constraintocs );
 680         if (rc) return rc;
 681
 682         return overlay_register( &constraint_ovl );
 683 }
 684
 685 #if SLAPD_OVER_CONSTRAINT == SLAPD_MOD_DYNAMIC
 686 int init_module(int argc, char *argv[]) {
 687         return constraint_initialize();
 688 }
 689 #endif
 690
 691 #endif /* defined(SLAPD_OVER_CONSTRAINT) */
 692