git.sur5r.net Git - openldap/blob - servers/slapd/back-ldap/bind.c

   1 /* bind.c - ldap backend bind function */
   2 /* $OpenLDAP$ */
   3 /*
   4  * Copyright 1998-2003 The OpenLDAP Foundation, All Rights Reserved.
   5  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   6  */
   7 /* This is an altered version */
   8 /*
   9  * Copyright 1999, Howard Chu, All rights reserved. <hyc@highlandsun.com>
  10  *
  11  * Permission is granted to anyone to use this software for any purpose
  12  * on any computer system, and to alter it and redistribute it, subject
  13  * to the following restrictions:
  14  *
  15  * 1. The author is not responsible for the consequences of use of this
  16  *    software, no matter how awful, even if they arise from flaws in it.
  17  *
  18  * 2. The origin of this software must not be misrepresented, either by
  19  *    explicit claim or by omission.  Since few users ever read sources,
  20  *    credits should appear in the documentation.
  21  *
  22  * 3. Altered versions must be plainly marked as such, and must not be
  23  *    misrepresented as being the original software.  Since few users
  24  *    ever read sources, credits should appear in the documentation.
  25  *
  26  * 4. This notice may not be removed or altered.
  27  *
  28  *
  29  *
  30  * Copyright 2000, Pierangelo Masarati, All rights reserved. <ando@sys-net.it>
  31  *
  32  * This software is being modified by Pierangelo Masarati.
  33  * The previously reported conditions apply to the modified code as well.
  34  * Changes in the original code are highlighted where required.
  35  * Credits for the original code go to the author, Howard Chu.
  36  */
  37
  38 #include "portable.h"
  39
  40 #include <stdio.h>
  41
  42 #include <ac/socket.h>
  43 #include <ac/string.h>
  44
  45
  46 #define AVL_INTERNAL
  47 #include "slap.h"
  48 #include "back-ldap.h"
  49
  50 #define PRINT_CONNTREE 0
  51
  52 static LDAP_REBIND_PROC ldap_back_rebind;
  53
  54 int
  55 ldap_back_bind(
  56     Operation           *op,
  57     SlapReply           *rs )
  58 {
  59         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
  60         struct ldapconn *lc;
  61
  62         struct berval mdn = { 0, NULL };
  63         int rc = 0;
  64         ber_int_t msgid;
  65
  66         lc = ldap_back_getconn(op, rs);
  67         if ( !lc ) {
  68                 return( -1 );
  69         }
  70
  71         /*
  72          * Rewrite the bind dn if needed
  73          */
  74 #ifdef ENABLE_REWRITE
  75         switch ( rewrite_session( li->rwinfo, "bindDn",
  76                                 op->o_req_dn.bv_val,
  77                                 op->o_conn, &mdn.bv_val ) ) {
  78         case REWRITE_REGEXEC_OK:
  79                 if ( mdn.bv_val == NULL ) {
  80                         mdn = op->o_req_dn;
  81                 } else {
  82                         mdn.bv_len = strlen( mdn.bv_val );
  83                 }
  84
  85 #ifdef NEW_LOGGING
  86                 LDAP_LOG( BACK_LDAP, DETAIL1,
  87                                 "[rw] bindDn: \"%s\" -> \"%s\"\n",
  88                                 op->o_req_dn.bv_val, mdn.bv_val, 0 );
  89 #else /* !NEW_LOGGING */
  90                 Debug( LDAP_DEBUG_ARGS, "rw> bindDn: \"%s\" -> \"%s\"\n",
  91                                 op->o_req_dn.bv_val, mdn.bv_val, 0 );
  92 #endif /* !NEW_LOGGING */
  93                 break;
  94
  95         case REWRITE_REGEXEC_UNWILLING:
  96                 send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
  97                                 "Operation not allowed" );
  98                 return( -1 );
  99
 100         case REWRITE_REGEXEC_ERR:
 101                 send_ldap_error( op, rs, LDAP_OTHER,
 102                                 "Rewrite error" );
 103                 return( -1 );
 104         }
 105 #else /* !ENABLE_REWRITE */
 106         ldap_back_dn_massage( li, &op->o_req_dn, &mdn, 0, 1 );
 107 #endif /* !ENABLE_REWRITE */
 108
 109         if ( lc->bound_dn.bv_val ) {
 110                 ch_free( lc->bound_dn.bv_val );
 111                 lc->bound_dn.bv_len = 0;
 112                 lc->bound_dn.bv_val = NULL;
 113         }
 114         lc->bound = 0;
 115         /* method is always LDAP_AUTH_SIMPLE if we got here */
 116         rs->sr_err = ldap_sasl_bind(lc->ld, mdn.bv_val, LDAP_SASL_SIMPLE,
 117                 &op->oq_bind.rb_cred, op->o_ctrls, NULL, &msgid);
 118         rc = ldap_back_op_result( lc, op, rs, msgid, 1 );
 119         if (rc == LDAP_SUCCESS) {
 120                 lc->bound = 1;
 121                 if ( mdn.bv_val != op->o_req_dn.bv_val ) {
 122                         lc->bound_dn = mdn;
 123                 } else {
 124                         ber_dupbv( &lc->bound_dn, &op->o_req_dn );
 125                 }
 126                 mdn.bv_val = NULL;
 127
 128                 if ( li->savecred ) {
 129                         if ( lc->cred.bv_val )
 130                                 ch_free( lc->cred.bv_val );
 131                         ber_dupbv( &lc->cred, &op->oq_bind.rb_cred );
 132                         ldap_set_rebind_proc( lc->ld, ldap_back_rebind, lc );
 133                 }
 134         }
 135
 136         /* must re-insert if local DN changed as result of bind */
 137         if ( lc->bound && !bvmatch(&op->o_req_ndn, &lc->local_dn ) ) {
 138                 int lerr;
 139
 140                 ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 141                 lc = avl_delete( &li->conntree, (caddr_t)lc,
 142                                 ldap_back_conn_cmp );
 143                 if ( lc->local_dn.bv_val )
 144                         ch_free( lc->local_dn.bv_val );
 145                 ber_dupbv( &lc->local_dn, &op->o_req_ndn );
 146                 lerr = avl_insert( &li->conntree, (caddr_t)lc,
 147                         ldap_back_conn_cmp, ldap_back_conn_dup );
 148                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 149                 if ( lerr == -1 ) {
 150                         ldap_back_conn_free( lc );
 151                 }
 152         }
 153
 154         if ( mdn.bv_val && mdn.bv_val != op->o_req_dn.bv_val ) {
 155                 free( mdn.bv_val );
 156         }
 157
 158         return( rc );
 159 }
 160
 161 /*
 162  * ldap_back_conn_cmp
 163  *
 164  * compares two struct ldapconn based on the value of the conn pointer;
 165  * used by avl stuff
 166  */
 167 int
 168 ldap_back_conn_cmp(
 169         const void *c1,
 170         const void *c2
 171         )
 172 {
 173         const struct ldapconn *lc1 = (const struct ldapconn *)c1;
 174         const struct ldapconn *lc2 = (const struct ldapconn *)c2;
 175         int rc;
 176
 177         /* If local DNs don't match, it is definitely not a match */
 178         if ( ( rc = ber_bvcmp( &lc1->local_dn, &lc2->local_dn )) )
 179                 return rc;
 180
 181         /* For shared sessions, conn is NULL. Only explicitly
 182          * bound sessions will have non-NULL conn.
 183          */
 184         return lc1->conn - lc2->conn;
 185 }
 186
 187 /*
 188  * ldap_back_conn_dup
 189  *
 190  * returns -1 in case a duplicate struct ldapconn has been inserted;
 191  * used by avl stuff
 192  */
 193 int
 194 ldap_back_conn_dup(
 195         void *c1,
 196         void *c2
 197         )
 198 {
 199         struct ldapconn *lc1 = (struct ldapconn *)c1;
 200         struct ldapconn *lc2 = (struct ldapconn *)c2;
 201
 202         /* Cannot have more than one shared session with same DN */
 203         if ( dn_match( &lc1->local_dn, &lc2->local_dn ) &&
 204                  lc1->conn == lc2->conn ) return -1;
 205
 206         return 0;
 207 }
 208
 209 #if PRINT_CONNTREE > 0
 210 static void ravl_print( Avlnode *root, int depth )
 211 {
 212         int     i;
 213         struct ldapconn *lc;
 214
 215         if ( root == 0 )
 216                 return;
 217
 218         ravl_print( root->avl_right, depth+1 );
 219
 220         for ( i = 0; i < depth; i++ )
 221                 printf( "   " );
 222
 223         lc = root->avl_data;
 224         printf( "lc(%lx) local(%s) conn(%lx) %d\n",
 225                         lc, lc->local_dn.bv_val, lc->conn, root->avl_bf );
 226
 227         ravl_print( root->avl_left, depth+1 );
 228 }
 229
 230 static void myprint( Avlnode *root )
 231 {
 232         printf( "********\n" );
 233
 234         if ( root == 0 )
 235                 printf( "\tNULL\n" );
 236
 237         else
 238                 ravl_print( root, 0 );
 239
 240         printf( "********\n" );
 241 }
 242 #endif /* PRINT_CONNTREE */
 243
 244 struct ldapconn *
 245 ldap_back_getconn(Operation *op, SlapReply *rs)
 246 {
 247         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 248         struct ldapconn *lc, lc_curr;
 249         LDAP *ld;
 250         int is_priv = 0;
 251
 252         /* Searches for a ldapconn in the avl tree */
 253
 254         /* Explicit binds must not be shared */
 255         if ( op->o_tag == LDAP_REQ_BIND
 256                 || (op->o_conn
 257                   && (op->o_bd == op->o_conn->c_authz_backend ))) {
 258                 lc_curr.conn = op->o_conn;
 259         } else {
 260                 lc_curr.conn = NULL;
 261         }
 262
 263         /* Internal searches are privileged and shared. So is root. */
 264         if ( op->o_do_not_cache || be_isroot( li->be, &op->o_ndn ) ) {
 265                 lc_curr.local_dn = li->be->be_rootndn;
 266                 lc_curr.conn = NULL;
 267                 is_priv = 1;
 268         } else {
 269                 lc_curr.local_dn = op->o_ndn;
 270         }
 271
 272         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 273         lc = (struct ldapconn *)avl_find( li->conntree,
 274                 (caddr_t)&lc_curr, ldap_back_conn_cmp );
 275         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 276
 277         /* Looks like we didn't get a bind. Open a new session... */
 278         if (!lc) {
 279                 int vers = op->o_conn->c_protocol;
 280                 rs->sr_err = ldap_initialize(&ld, li->url);
 281
 282                 if (rs->sr_err != LDAP_SUCCESS) {
 283                         rs->sr_err = ldap_back_map_result(rs);
 284                         if (rs->sr_text == NULL) {
 285                                 rs->sr_text = "ldap_initialize() failed";
 286                         }
 287                         send_ldap_result( op, rs );
 288                         rs->sr_text = NULL;
 289                         return( NULL );
 290                 }
 291                 /* Set LDAP version. This will always succeed: If the client
 292                  * bound with a particular version, then so can we.
 293                  */
 294                 ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION,
 295                                 (const void *)&vers);
 296                 /* FIXME: configurable? */
 297                 ldap_set_option(ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON);
 298
 299                 lc = (struct ldapconn *)ch_malloc(sizeof(struct ldapconn));
 300                 lc->conn = lc_curr.conn;
 301                 lc->ld = ld;
 302                 ber_dupbv( &lc->local_dn, &lc_curr.local_dn );
 303
 304 #ifdef ENABLE_REWRITE
 305                 /*
 306                  * Sets a cookie for the rewrite session
 307                  *
 308                  * FIXME: the o_conn might be no longer valid,
 309                  * since we may have different entries
 310                  * for the same connection
 311                  */
 312                 ( void )rewrite_session_init( li->rwinfo, op->o_conn );
 313 #endif /* ENABLE_REWRITE */
 314
 315                 ldap_pvt_thread_mutex_init( &lc->lc_mutex );
 316
 317                 if ( is_priv ) {
 318                         ber_dupbv( &lc->cred, &li->bindpw );
 319                         ber_dupbv( &lc->bound_dn, &li->binddn );
 320                 } else {
 321                         lc->cred.bv_len = 0;
 322                         lc->cred.bv_val = NULL;
 323                         if ( op->o_conn->c_dn.bv_len != 0
 324                                         && ( op->o_bd == op->o_conn->c_authz_backend ) ) {
 325
 326                                 /*
 327                                  * Rewrite the bind dn if needed
 328                                  */
 329 #ifdef ENABLE_REWRITE
 330                                 lc->bound_dn.bv_val = NULL;
 331                                 lc->bound_dn.bv_len = 0;
 332                                 switch ( rewrite_session( li->rwinfo, "bindDn",
 333                                                         op->o_conn->c_dn.bv_val,
 334                                                         op->o_conn,
 335                                                         &lc->bound_dn.bv_val ) ) {
 336                                 case REWRITE_REGEXEC_OK:
 337                                         if ( lc->bound_dn.bv_val == NULL ) {
 338                                                 ber_dupbv( &lc->bound_dn,
 339                                                                 &op->o_conn->c_dn );
 340                                         } else {
 341                                                 lc->bound_dn.bv_len = strlen( lc->bound_dn.bv_val );
 342                                         }
 343 #ifdef NEW_LOGGING
 344                                         LDAP_LOG( BACK_LDAP, DETAIL1,
 345                                                         "[rw] bindDn: \"%s\" ->"
 346                                                         " \"%s\"\n",
 347                                                         op->o_conn->c_dn.bv_val,
 348                                                         lc->bound_dn.bv_val, 0 );
 349 #else /* !NEW_LOGGING */
 350                                         Debug( LDAP_DEBUG_ARGS,
 351                                                         "rw> bindDn: \"%s\" ->"
 352                                                         " \"%s\"\n",
 353                                                         op->o_conn->c_dn.bv_val,
 354                                                         lc->bound_dn.bv_val, 0 );
 355 #endif /* !NEW_LOGGING */
 356                                         break;
 357
 358                                 case REWRITE_REGEXEC_UNWILLING:
 359                                         send_ldap_error( op, rs,
 360                                                         LDAP_UNWILLING_TO_PERFORM,
 361                                                         "Operation not allowed" );
 362                                         return( NULL );
 363
 364                                 case REWRITE_REGEXEC_ERR:
 365                                         send_ldap_error( op, rs,
 366                                                         LDAP_OTHER,
 367                                                         "Rewrite error" );
 368                                         return( NULL );
 369                                 }
 370
 371 #else /* !ENABLE_REWRITE */
 372                                 struct berval bv;
 373                                 ldap_back_dn_massage( li, &op->o_conn->c_dn, &bv, 0, 1 );
 374                                 if ( bv.bv_val == op->o_conn->c_dn.bv_val ) {
 375                                         ber_dupbv( &lc->bound_dn, &bv );
 376                                 } else {
 377                                         lc->bound_dn = bv;
 378                                 }
 379 #endif /* !ENABLE_REWRITE */
 380
 381                         } else {
 382                                 lc->bound_dn.bv_val = NULL;
 383                                 lc->bound_dn.bv_len = 0;
 384                         }
 385                 }
 386
 387                 lc->bound = 0;
 388
 389                 /* Inserts the newly created ldapconn in the avl tree */
 390                 ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 391                 rs->sr_err = avl_insert( &li->conntree, (caddr_t)lc,
 392                         ldap_back_conn_cmp, ldap_back_conn_dup );
 393
 394 #if PRINT_CONNTREE > 0
 395                 myprint( li->conntree );
 396 #endif /* PRINT_CONNTREE */
 397
 398                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 399
 400 #ifdef NEW_LOGGING
 401                 LDAP_LOG( BACK_LDAP, INFO,
 402                         "ldap_back_getconn: conn %lx inserted\n", lc, 0, 0);
 403 #else /* !NEW_LOGGING */
 404                 Debug( LDAP_DEBUG_TRACE,
 405                         "=>ldap_back_getconn: conn %lx inserted\n", lc, 0, 0 );
 406 #endif /* !NEW_LOGGING */
 407
 408                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 409                 if ( rs->sr_err != 0 ) {
 410                         ldap_back_conn_free( lc );
 411                         send_ldap_error( op, rs, LDAP_OTHER,
 412                         "internal server error" );
 413                         return( NULL );
 414                 }
 415         } else {
 416 #ifdef NEW_LOGGING
 417                 LDAP_LOG( BACK_LDAP, INFO,
 418                         "ldap_back_getconn: conn %lx fetched\n",
 419                         lc, 0, 0 );
 420 #else /* !NEW_LOGGING */
 421                 Debug( LDAP_DEBUG_TRACE,
 422                         "=>ldap_back_getconn: conn %lx fetched\n", lc, 0, 0 );
 423 #endif /* !NEW_LOGGING */
 424         }
 425
 426         return( lc );
 427 }
 428
 429 /*
 430  * ldap_back_dobind
 431  *
 432  * Note: as the check for the value of lc->bound was already here, I removed
 433  * it from all the callers, and I made the function return the flag, so
 434  * it can be used to simplify the check.
 435  */
 436 int
 437 ldap_back_dobind( struct ldapconn *lc, Operation *op, SlapReply *rs )
 438 {
 439         int rc;
 440         ber_int_t msgid;
 441
 442         ldap_pvt_thread_mutex_lock( &lc->lc_mutex );
 443         if ( !lc->bound ) {
 444                 rs->sr_err = ldap_sasl_bind(lc->ld, lc->bound_dn.bv_val,
 445                         LDAP_SASL_SIMPLE, &lc->cred, NULL, NULL, &msgid);
 446                 rc = ldap_back_op_result( lc, op, rs, msgid, 0 );
 447                 if (rc == LDAP_SUCCESS) {
 448                         lc->bound = 1;
 449                 }
 450         }
 451         rc = lc->bound;
 452         ldap_pvt_thread_mutex_unlock( &lc->lc_mutex );
 453         return rc;
 454 }
 455
 456 /*
 457  * ldap_back_rebind
 458  *
 459  * This is a callback used for chasing referrals using the same
 460  * credentials as the original user on this session.
 461  */
 462 static int
 463 ldap_back_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 464         ber_int_t msgid, void *params )
 465 {
 466         struct ldapconn *lc = params;
 467
 468         return ldap_bind_s( ld, lc->bound_dn.bv_val, lc->cred.bv_val, LDAP_AUTH_SIMPLE );
 469 }
 470
 471 /* Map API errors to protocol errors... */
 472
 473 int
 474 ldap_back_map_result(SlapReply *rs)
 475 {
 476         switch(rs->sr_err)
 477         {
 478         case LDAP_SERVER_DOWN:
 479                 return LDAP_UNAVAILABLE;
 480         case LDAP_LOCAL_ERROR:
 481                 return LDAP_OTHER;
 482         case LDAP_ENCODING_ERROR:
 483         case LDAP_DECODING_ERROR:
 484                 return LDAP_PROTOCOL_ERROR;
 485         case LDAP_TIMEOUT:
 486                 return LDAP_UNAVAILABLE;
 487         case LDAP_AUTH_UNKNOWN:
 488                 return LDAP_AUTH_METHOD_NOT_SUPPORTED;
 489         case LDAP_FILTER_ERROR:
 490                 rs->sr_text = "Filter error";
 491                 return LDAP_OTHER;
 492         case LDAP_USER_CANCELLED:
 493                 rs->sr_text = "User cancelled";
 494                 return LDAP_OTHER;
 495         case LDAP_PARAM_ERROR:
 496                 return LDAP_PROTOCOL_ERROR;
 497         case LDAP_NO_MEMORY:
 498                 return LDAP_OTHER;
 499         case LDAP_CONNECT_ERROR:
 500                 return LDAP_UNAVAILABLE;
 501         case LDAP_NOT_SUPPORTED:
 502                 return LDAP_UNWILLING_TO_PERFORM;
 503         case LDAP_CONTROL_NOT_FOUND:
 504                 return LDAP_PROTOCOL_ERROR;
 505         case LDAP_NO_RESULTS_RETURNED:
 506                 return LDAP_NO_SUCH_OBJECT;
 507         case LDAP_MORE_RESULTS_TO_RETURN:
 508                 rs->sr_text = "More results to return";
 509                 return LDAP_OTHER;
 510         case LDAP_CLIENT_LOOP:
 511         case LDAP_REFERRAL_LIMIT_EXCEEDED:
 512                 return LDAP_LOOP_DETECT;
 513         default:
 514                 if LDAP_API_ERROR(rs->sr_err)
 515                         return LDAP_OTHER;
 516                 else
 517                         return rs->sr_err;
 518         }
 519 }
 520
 521 int
 522 ldap_back_op_result(struct ldapconn *lc, Operation *op, SlapReply *rs,
 523         ber_int_t msgid, int sendok)
 524 {
 525         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 526         char *match = NULL;
 527         LDAPMessage *res;
 528         char *text = NULL;
 529
 530         rs->sr_text = NULL;
 531         rs->sr_matched = NULL;
 532
 533         if (rs->sr_err == LDAP_SUCCESS) {
 534                 if (ldap_result(lc->ld, msgid, 1, NULL, &res) == -1) {
 535                         ldap_get_option(lc->ld, LDAP_OPT_ERROR_NUMBER,
 536                                         &rs->sr_err);
 537                 } else {
 538                         int rc = ldap_parse_result(lc->ld, res, &rs->sr_err,
 539                                         &match, &text, NULL, NULL, 1);
 540                         rs->sr_text = text;
 541                         if (rc != LDAP_SUCCESS) rs->sr_err = rc;
 542                 }
 543         }
 544
 545         if (rs->sr_err != LDAP_SUCCESS) {
 546                 rs->sr_err = ldap_back_map_result(rs);
 547
 548                 /* internal ops must not reply to client */
 549                 if ( op->o_conn && !op->o_do_not_cache ) {
 550 #ifdef ENABLE_REWRITE
 551                         if (match) {
 552
 553                                 switch(rewrite_session(li->rwinfo, "matchedDn", match, op->o_conn,
 554                                         (char **)&rs->sr_matched)) {
 555                                 case REWRITE_REGEXEC_OK:
 556                                         if (!rs->sr_matched) rs->sr_matched = match; break;
 557                                 case REWRITE_REGEXEC_UNWILLING:
 558                                 case REWRITE_REGEXEC_ERR:
 559                                         break;
 560                                 }
 561                         }
 562 #else
 563                         struct berval dn, mdn;
 564                         if (match) {
 565                                 ber_str2bv(match, 0, 0, &dn);
 566                                 ldap_back_dn_massage(li, &dn, &mdn, 0, 0);
 567                                 rs->sr_matched = mdn.bv_val;
 568                         }
 569 #endif
 570                 }
 571         }
 572         if (op->o_conn && (sendok || rs->sr_err != LDAP_SUCCESS)) {
 573                 send_ldap_result( op, rs );
 574         }
 575         if ( match ) {
 576                 if ( rs->sr_matched != match ) {
 577                         free( (char *)rs->sr_matched );
 578                 }
 579                 rs->sr_matched = NULL;
 580                 ldap_memfree( match );
 581         }
 582         if ( text ) {
 583                 ldap_memfree( text );
 584         }
 585         rs->sr_text = NULL;
 586         return( (rs->sr_err == LDAP_SUCCESS) ? 0 : -1 );
 587 }
 588