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         rc = 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( li, lc, op, rs, msgid, rc, 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                 if ( li->savecred ) {
 127                         if ( lc->cred.bv_val )
 128                                 ch_free( lc->cred.bv_val );
 129                         ber_dupbv( &lc->cred, &op->oq_bind.rb_cred );
 130                         ldap_set_rebind_proc( lc->ld, ldap_back_rebind, lc );
 131                 }
 132         }
 133
 134         /* must re-insert if local DN changed as result of bind */
 135         if ( lc->bound && !bvmatch(&op->o_req_ndn, &lc->local_dn ) ) {
 136                 int lerr;
 137
 138                 ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 139                 lc = avl_delete( &li->conntree, (caddr_t)lc,
 140                                 ldap_back_conn_cmp );
 141                 if ( lc->local_dn.bv_val )
 142                         ch_free( lc->local_dn.bv_val );
 143                 ber_dupbv( &lc->local_dn, &op->o_req_ndn );
 144                 lerr = avl_insert( &li->conntree, (caddr_t)lc,
 145                         ldap_back_conn_cmp, ldap_back_conn_dup );
 146                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 147                 if ( lerr == -1 ) {
 148                         ldap_back_conn_free( lc );
 149                 }
 150         }
 151
 152         return( rc );
 153 }
 154
 155 /*
 156  * ldap_back_conn_cmp
 157  *
 158  * compares two struct ldapconn based on the value of the conn pointer;
 159  * used by avl stuff
 160  */
 161 int
 162 ldap_back_conn_cmp(
 163         const void *c1,
 164         const void *c2
 165         )
 166 {
 167         const struct ldapconn *lc1 = (const struct ldapconn *)c1;
 168         const struct ldapconn *lc2 = (const struct ldapconn *)c2;
 169         int rc;
 170
 171         /* If local DNs don't match, it is definitely not a match */
 172         if ( ( rc = ber_bvcmp( &lc1->local_dn, &lc2->local_dn )) )
 173                 return rc;
 174
 175         /* For shared sessions, conn is NULL. Only explicitly
 176          * bound sessions will have non-NULL conn.
 177          */
 178         return lc1->conn - lc2->conn;
 179 }
 180
 181 /*
 182  * ldap_back_conn_dup
 183  *
 184  * returns -1 in case a duplicate struct ldapconn has been inserted;
 185  * used by avl stuff
 186  */
 187 int
 188 ldap_back_conn_dup(
 189         void *c1,
 190         void *c2
 191         )
 192 {
 193         struct ldapconn *lc1 = (struct ldapconn *)c1;
 194         struct ldapconn *lc2 = (struct ldapconn *)c2;
 195
 196         /* Cannot have more than one shared session with same DN */
 197         if ( dn_match( &lc1->local_dn, &lc2->local_dn ) &&
 198                  lc1->conn == lc2->conn ) return -1;
 199
 200         return 0;
 201 }
 202
 203 #if PRINT_CONNTREE > 0
 204 static void ravl_print( Avlnode *root, int depth )
 205 {
 206         int     i;
 207         struct ldapconn *lc;
 208
 209         if ( root == 0 )
 210                 return;
 211
 212         ravl_print( root->avl_right, depth+1 );
 213
 214         for ( i = 0; i < depth; i++ )
 215                 printf( "   " );
 216
 217         lc = root->avl_data;
 218         printf( "lc(%lx) local(%s) conn(%lx) %d\n",
 219                         lc, lc->local_dn.bv_val, lc->conn, root->avl_bf );
 220
 221         ravl_print( root->avl_left, depth+1 );
 222 }
 223
 224 static void myprint( Avlnode *root )
 225 {
 226         printf( "********\n" );
 227
 228         if ( root == 0 )
 229                 printf( "\tNULL\n" );
 230
 231         else
 232                 ravl_print( root, 0 );
 233
 234         printf( "********\n" );
 235 }
 236 #endif /* PRINT_CONNTREE */
 237
 238 struct ldapconn *
 239 ldap_back_getconn(Operation *op, SlapReply *rs)
 240 {
 241         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 242         struct ldapconn *lc, lc_curr;
 243         LDAP *ld;
 244         int is_priv = 0;
 245
 246         /* Searches for a ldapconn in the avl tree */
 247
 248         /* Explicit binds must not be shared */
 249         if ( op->o_tag == LDAP_REQ_BIND
 250                 || (op->o_conn
 251                   && (op->o_bd == op->o_conn->c_authz_backend ))) {
 252                 lc_curr.conn = op->o_conn;
 253         } else {
 254                 lc_curr.conn = NULL;
 255         }
 256
 257         /* Internal searches are privileged and shared. So is root. */
 258         if ( op->o_do_not_cache || be_isroot( li->be, &op->o_ndn ) ) {
 259                 lc_curr.local_dn = li->be->be_rootndn;
 260                 lc_curr.conn = NULL;
 261                 is_priv = 1;
 262         } else {
 263                 lc_curr.local_dn = op->o_ndn;
 264         }
 265         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 266         lc = (struct ldapconn *)avl_find( li->conntree,
 267                 (caddr_t)&lc_curr, ldap_back_conn_cmp );
 268         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 269
 270         /* Looks like we didn't get a bind. Open a new session... */
 271         if (!lc) {
 272                 int vers = op->o_conn->c_protocol;
 273                 rs->sr_err = ldap_initialize(&ld, li->url);
 274
 275                 if (rs->sr_err != LDAP_SUCCESS) {
 276                         rs->sr_err = ldap_back_map_result(rs->sr_err);
 277                         rs->sr_text = "ldap_initialize() failed";
 278                         send_ldap_result( op, rs );
 279                         return( NULL );
 280                 }
 281                 /* Set LDAP version. This will always succeed: If the client
 282                  * bound with a particular version, then so can we.
 283                  */
 284                 ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION,
 285                                 (const void *)&vers);
 286                 /* FIXME: configurable? */
 287                 ldap_set_option(ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON);
 288
 289                 lc = (struct ldapconn *)ch_malloc(sizeof(struct ldapconn));
 290                 lc->conn = lc_curr.conn;
 291                 lc->ld = ld;
 292                 ber_dupbv( &lc->local_dn, &lc_curr.local_dn );
 293
 294 #ifdef ENABLE_REWRITE
 295                 /*
 296                  * Sets a cookie for the rewrite session
 297                  *
 298                  * FIXME: the o_conn might be no longer valid,
 299                  * since we may have different entries
 300                  * for the same connection
 301                  */
 302                 ( void )rewrite_session_init( li->rwinfo, op->o_conn );
 303 #endif /* ENABLE_REWRITE */
 304
 305                 ldap_pvt_thread_mutex_init( &lc->lc_mutex );
 306
 307                 if ( is_priv ) {
 308                         ber_dupbv( &lc->cred, &li->bindpw );
 309                         ber_dupbv( &lc->bound_dn, &li->binddn );
 310                 } else {
 311                         lc->cred.bv_len = 0;
 312                         lc->cred.bv_val = NULL;
 313                         if ( op->o_conn->c_dn.bv_len != 0 ) {
 314
 315                                 /*
 316                                  * Rewrite the bind dn if needed
 317                                  */
 318 #ifdef ENABLE_REWRITE
 319                                 lc->bound_dn.bv_val = NULL;
 320                                 lc->bound_dn.bv_len = 0;
 321                                 switch ( rewrite_session( li->rwinfo, "bindDn",
 322                                                         op->o_conn->c_dn.bv_val,
 323                                                         op->o_conn,
 324                                                         &lc->bound_dn.bv_val ) ) {
 325                                 case REWRITE_REGEXEC_OK:
 326                                         if ( lc->bound_dn.bv_val == NULL ) {
 327                                                 ber_dupbv( &lc->bound_dn,
 328                                                                 &op->o_conn->c_dn );
 329                                         } else {
 330                                                 lc->bound_dn.bv_len = strlen( lc->bound_dn.bv_val );
 331                                         }
 332 #ifdef NEW_LOGGING
 333                                         LDAP_LOG( BACK_LDAP, DETAIL1,
 334                                                         "[rw] bindDn: \"%s\" ->"
 335                                                         " \"%s\"\n",
 336                                                         op->o_conn->c_dn.bv_val,
 337                                                         lc->bound_dn.bv_val, 0 );
 338 #else /* !NEW_LOGGING */
 339                                         Debug( LDAP_DEBUG_ARGS,
 340                                                         "rw> bindDn: \"%s\" ->"
 341                                                         " \"%s\"\n",
 342                                                         op->o_conn->c_dn.bv_val,
 343                                                         lc->bound_dn.bv_val, 0 );
 344 #endif /* !NEW_LOGGING */
 345                                         break;
 346
 347                                 case REWRITE_REGEXEC_UNWILLING:
 348                                         send_ldap_error( op, rs,
 349                                                         LDAP_UNWILLING_TO_PERFORM,
 350                                                         "Operation not allowed" );
 351                                         return( NULL );
 352
 353                                 case REWRITE_REGEXEC_ERR:
 354                                         send_ldap_error( op, rs,
 355                                                         LDAP_OTHER,
 356                                                         "Rewrite error" );
 357                                         return( NULL );
 358                                 }
 359
 360 #else /* !ENABLE_REWRITE */
 361                                 struct berval bv;
 362                                 ldap_back_dn_massage( li, &op->o_conn->c_dn, &bv, 0, 1 );
 363                                 if ( bv.bv_val == op->o_conn->c_dn.bv_val ) {
 364                                         ber_dupbv( &lc->bound_dn, &bv );
 365                                 } else {
 366                                         lc->bound_dn = bv;
 367                                 }
 368 #endif /* !ENABLE_REWRITE */
 369
 370                         } else {
 371                                 lc->bound_dn.bv_val = NULL;
 372                                 lc->bound_dn.bv_len = 0;
 373                         }
 374                 }
 375
 376                 lc->bound = 0;
 377
 378                 /* Inserts the newly created ldapconn in the avl tree */
 379                 ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 380                 rs->sr_err = avl_insert( &li->conntree, (caddr_t)lc,
 381                         ldap_back_conn_cmp, ldap_back_conn_dup );
 382
 383 #if PRINT_CONNTREE > 0
 384                 myprint( li->conntree );
 385 #endif /* PRINT_CONNTREE */
 386
 387                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 388
 389 #ifdef NEW_LOGGING
 390                 LDAP_LOG( BACK_LDAP, INFO,
 391                         "ldap_back_getconn: conn %lx inserted\n", lc, 0, 0);
 392 #else /* !NEW_LOGGING */
 393                 Debug( LDAP_DEBUG_TRACE,
 394                         "=>ldap_back_getconn: conn %lx inserted\n", lc, 0, 0 );
 395 #endif /* !NEW_LOGGING */
 396
 397                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 398                 if ( rs->sr_err != 0 ) {
 399                         ldap_back_conn_free( lc );
 400                         send_ldap_error( op, rs, LDAP_OTHER,
 401                         "internal server error" );
 402                         return( NULL );
 403                 }
 404         } else {
 405 #ifdef NEW_LOGGING
 406                 LDAP_LOG( BACK_LDAP, INFO,
 407                         "ldap_back_getconn: conn %lx fetched\n",
 408                         lc, 0, 0 );
 409 #else /* !NEW_LOGGING */
 410                 Debug( LDAP_DEBUG_TRACE,
 411                         "=>ldap_back_getconn: conn %lx fetched\n", lc, 0, 0 );
 412 #endif /* !NEW_LOGGING */
 413         }
 414
 415         return( lc );
 416 }
 417
 418 /*
 419  * ldap_back_dobind
 420  *
 421  * Note: as the check for the value of lc->bound was already here, I removed
 422  * it from all the callers, and I made the function return the flag, so
 423  * it can be used to simplify the check.
 424  */
 425 int
 426 ldap_back_dobind( struct ldapconn *lc, Operation *op, SlapReply *rs )
 427 {
 428         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 429         int rc;
 430         ber_int_t msgid;
 431
 432         ldap_pvt_thread_mutex_lock( &lc->lc_mutex );
 433         if ( !lc->bound ) {
 434                 rc = ldap_sasl_bind(lc->ld, lc->bound_dn.bv_val,
 435                         LDAP_SASL_SIMPLE, &lc->cred, NULL, NULL, &msgid);
 436                 rc = ldap_back_op_result( li, lc, op, rs, msgid, rc, 0 );
 437                 if (rc == LDAP_SUCCESS) {
 438                         lc->bound = 1;
 439                 }
 440         }
 441         rc = lc->bound;
 442         ldap_pvt_thread_mutex_unlock( &lc->lc_mutex );
 443         return rc;
 444 }
 445
 446 /*
 447  * ldap_back_rebind
 448  *
 449  * This is a callback used for chasing referrals using the same
 450  * credentials as the original user on this session.
 451  */
 452 static int
 453 ldap_back_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 454         ber_int_t msgid, void *params )
 455 {
 456         struct ldapconn *lc = params;
 457
 458         return ldap_bind_s( ld, lc->bound_dn.bv_val, lc->cred.bv_val, LDAP_AUTH_SIMPLE );
 459 }
 460
 461 /* Map API errors to protocol errors... */
 462
 463 int
 464 ldap_back_map_result(int err)
 465 {
 466         switch(err)
 467         {
 468         case LDAP_SERVER_DOWN:
 469                 return LDAP_UNAVAILABLE;
 470         case LDAP_LOCAL_ERROR:
 471                 return LDAP_OTHER;
 472         case LDAP_ENCODING_ERROR:
 473         case LDAP_DECODING_ERROR:
 474                 return LDAP_PROTOCOL_ERROR;
 475         case LDAP_TIMEOUT:
 476                 return LDAP_UNAVAILABLE;
 477         case LDAP_AUTH_UNKNOWN:
 478                 return LDAP_AUTH_METHOD_NOT_SUPPORTED;
 479         case LDAP_FILTER_ERROR:
 480                 return LDAP_OTHER;
 481         case LDAP_USER_CANCELLED:
 482                 return LDAP_OTHER;
 483         case LDAP_PARAM_ERROR:
 484                 return LDAP_PROTOCOL_ERROR;
 485         case LDAP_NO_MEMORY:
 486                 return LDAP_OTHER;
 487         case LDAP_CONNECT_ERROR:
 488                 return LDAP_UNAVAILABLE;
 489         case LDAP_NOT_SUPPORTED:
 490                 return LDAP_UNWILLING_TO_PERFORM;
 491         case LDAP_CONTROL_NOT_FOUND:
 492                 return LDAP_PROTOCOL_ERROR;
 493         case LDAP_NO_RESULTS_RETURNED:
 494                 return LDAP_NO_SUCH_OBJECT;
 495         case LDAP_MORE_RESULTS_TO_RETURN:
 496                 return LDAP_OTHER;
 497         case LDAP_CLIENT_LOOP:
 498         case LDAP_REFERRAL_LIMIT_EXCEEDED:
 499                 return LDAP_LOOP_DETECT;
 500         default:
 501                 if LDAP_API_ERROR(err)
 502                         return LDAP_OTHER;
 503                 else
 504                         return err;
 505         }
 506 }
 507
 508 int
 509 ldap_back_op_result(struct ldapinfo *li, struct ldapconn *lc,
 510         Operation *op, SlapReply *rs, ber_int_t msgid, int err, int sendok)
 511 {
 512         char *match = NULL;
 513         LDAPMessage *res;
 514         int rc;
 515
 516         rs->sr_text = NULL;
 517         rs->sr_matched = NULL;
 518
 519         if (err == LDAP_SUCCESS) {
 520                 if (ldap_result(lc->ld, msgid, 1, NULL, &res) == -1) {
 521                         ldap_get_option(lc->ld, LDAP_OPT_ERROR_NUMBER, &err);
 522                 } else {
 523                         rc = ldap_parse_result(lc->ld, res, &err, &match,
 524                                 (char **)&rs->sr_text, NULL, NULL, 1);
 525                         if (rc != LDAP_SUCCESS) err = rc;
 526                 }
 527         }
 528         if (err != LDAP_SUCCESS) {
 529                 err = ldap_back_map_result(err);
 530
 531                 /* internal ops must not reply to client */
 532                 if ( op->o_conn && !op->o_do_not_cache ) {
 533 #ifdef ENABLE_REWRITE
 534                         if (match) {
 535
 536                                 switch(rewrite_session(li->rwinfo, "matchedDn", match, op->o_conn,
 537                                         (char **)&rs->sr_matched)) {
 538                                 case REWRITE_REGEXEC_OK:
 539                                         if (!rs->sr_matched) rs->sr_matched = match; break;
 540                                 case REWRITE_REGEXEC_UNWILLING:
 541                                 case REWRITE_REGEXEC_ERR:
 542                                         break;
 543                                 }
 544                         }
 545 #else
 546                         struct berval dn, mdn;
 547                         if (match) {
 548                                 ber_str2bv(match, 0, 0, &dn);
 549                                 ldap_back_dn_massage(li, &dn, &mdn, 0, 0);
 550                                 rs->sr_matched = mdn.bv_val;
 551                         }
 552 #endif
 553                 }
 554         }
 555         if (op->o_conn && (sendok || err != LDAP_SUCCESS)) {
 556                 rs->sr_err = err;
 557                 send_ldap_result( op, rs );
 558         }
 559         if (rs->sr_matched != match) free((char *)rs->sr_matched);
 560         rs->sr_matched = NULL;
 561         if ( match ) ldap_memfree( match );
 562         if ( rs->sr_text ) {
 563                 ldap_memfree( (char *)rs->sr_text );
 564                 rs->sr_text = NULL;
 565         }
 566         return( (err==LDAP_SUCCESS) ? 0 : -1 );
 567 }
 568