git.sur5r.net Git - openldap/blob - libraries/libldap/sasl.c

   1 /* $OpenLDAP$ */
   2 /*
   3  * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
   4  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   5  */
   6
   7 /*
   8  *      BindRequest ::= SEQUENCE {
   9  *              version         INTEGER,
  10  *              name            DistinguishedName,       -- who
  11  *              authentication  CHOICE {
  12  *                      simple          [0] OCTET STRING -- passwd
  13 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
  14  *                      krbv42ldap      [1] OCTET STRING
  15  *                      krbv42dsa       [2] OCTET STRING
  16 #endif
  17  *                      sasl            [3] SaslCredentials     -- LDAPv3
  18  *              }
  19  *      }
  20  *
  21  *      BindResponse ::= SEQUENCE {
  22  *              COMPONENTS OF LDAPResult,
  23  *              serverSaslCreds         OCTET STRING OPTIONAL -- LDAPv3
  24  *      }
  25  *
  26  */
  27
  28 #include "portable.h"
  29
  30 #include <stdio.h>
  31
  32 #include <ac/socket.h>
  33 #include <ac/string.h>
  34 #include <ac/time.h>
  35
  36 #include "ldap-int.h"
  37
  38
  39 /*
  40  * ldap_sasl_bind - bind to the ldap server (and X.500).
  41  * The dn (usually NULL), mechanism, and credentials are provided.
  42  * The message id of the request initiated is provided upon successful
  43  * (LDAP_SUCCESS) return.
  44  *
  45  * Example:
  46  *      ldap_sasl_bind( ld, NULL, "mechanism",
  47  *              cred, NULL, NULL, &msgid )
  48  */
  49
  50 int
  51 ldap_sasl_bind(
  52         LDAP                    *ld,
  53         LDAP_CONST char *dn,
  54         LDAP_CONST char *mechanism,
  55         struct berval   *cred,
  56         LDAPControl             **sctrls,
  57         LDAPControl             **cctrls,
  58         int                             *msgidp )
  59 {
  60         BerElement      *ber;
  61         int rc;
  62
  63         Debug( LDAP_DEBUG_TRACE, "ldap_sasl_bind\n", 0, 0, 0 );
  64
  65         assert( ld != NULL );
  66         assert( LDAP_VALID( ld ) );
  67         assert( msgidp != NULL );
  68
  69         if( msgidp == NULL ) {
  70                 ld->ld_errno = LDAP_PARAM_ERROR;
  71                 return ld->ld_errno;
  72         }
  73
  74         if( mechanism == LDAP_SASL_SIMPLE ) {
  75                 if( dn == NULL && cred != NULL ) {
  76                         /* use default binddn */
  77                         dn = ld->ld_defbinddn;
  78                 }
  79
  80         } else if( ld->ld_version < LDAP_VERSION3 ) {
  81                 ld->ld_errno = LDAP_NOT_SUPPORTED;
  82                 return ld->ld_errno;
  83         }
  84
  85         if ( dn == NULL ) {
  86                 dn = "";
  87         }
  88
  89         /* create a message to send */
  90         if ( (ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
  91                 ld->ld_errno = LDAP_NO_MEMORY;
  92                 return ld->ld_errno;
  93         }
  94
  95         assert( BER_VALID( ber ) );
  96
  97         if( mechanism == LDAP_SASL_SIMPLE ) {
  98                 /* simple bind */
  99                 rc = ber_printf( ber, "{it{istO}" /*}*/,
 100                         ++ld->ld_msgid, LDAP_REQ_BIND,
 101                         ld->ld_version, dn, LDAP_AUTH_SIMPLE,
 102                         cred );
 103
 104         } else if ( cred == NULL ) {
 105                 /* SASL bind w/o creditials */
 106                 rc = ber_printf( ber, "{it{ist{s}}" /*}*/,
 107                         ++ld->ld_msgid, LDAP_REQ_BIND,
 108                         ld->ld_version, dn, LDAP_AUTH_SASL,
 109                         mechanism );
 110
 111         } else {
 112                 /* SASL bind w/ creditials */
 113                 rc = ber_printf( ber, "{it{ist{sO}}" /*}*/,
 114                         ++ld->ld_msgid, LDAP_REQ_BIND,
 115                         ld->ld_version, dn, LDAP_AUTH_SASL,
 116                         mechanism, cred );
 117         }
 118
 119         if( rc == -1 ) {
 120                 ld->ld_errno = LDAP_ENCODING_ERROR;
 121                 ber_free( ber, 1 );
 122                 return( -1 );
 123         }
 124
 125         /* Put Server Controls */
 126         if( ldap_int_put_controls( ld, sctrls, ber ) != LDAP_SUCCESS ) {
 127                 ber_free( ber, 1 );
 128                 return ld->ld_errno;
 129         }
 130
 131         if ( ber_printf( ber, /*{*/ "}" ) == -1 ) {
 132                 ld->ld_errno = LDAP_ENCODING_ERROR;
 133                 ber_free( ber, 1 );
 134                 return ld->ld_errno;
 135         }
 136
 137 #ifndef LDAP_NOCACHE
 138         if ( ld->ld_cache != NULL ) {
 139                 ldap_flush_cache( ld );
 140         }
 141 #endif /* !LDAP_NOCACHE */
 142
 143         /* send the message */
 144         *msgidp = ldap_send_initial_request( ld, LDAP_REQ_BIND, dn, ber );
 145
 146         if(*msgidp < 0)
 147                 return ld->ld_errno;
 148
 149         return LDAP_SUCCESS;
 150 }
 151
 152
 153 int
 154 ldap_sasl_bind_s(
 155         LDAP                    *ld,
 156         LDAP_CONST char *dn,
 157         LDAP_CONST char *mechanism,
 158         struct berval   *cred,
 159         LDAPControl             **sctrls,
 160         LDAPControl             **cctrls,
 161         struct berval   **servercredp )
 162 {
 163         int     rc, msgid;
 164         LDAPMessage     *result;
 165         struct berval   *scredp = NULL;
 166
 167         Debug( LDAP_DEBUG_TRACE, "ldap_sasl_bind_s\n", 0, 0, 0 );
 168
 169         /* do a quick !LDAPv3 check... ldap_sasl_bind will do the rest. */
 170         if( servercredp != NULL ) {
 171                 if (ld->ld_version < LDAP_VERSION3) {
 172                         ld->ld_errno = LDAP_NOT_SUPPORTED;
 173                         return ld->ld_errno;
 174                 }
 175                 *servercredp = NULL;
 176         }
 177
 178         rc = ldap_sasl_bind( ld, dn, mechanism, cred, sctrls, cctrls, &msgid );
 179
 180         if ( rc != LDAP_SUCCESS ) {
 181                 return( rc );
 182         }
 183
 184         if ( ldap_result( ld, msgid, 1, NULL, &result ) == -1 ) {
 185                 return( ld->ld_errno ); /* ldap_result sets ld_errno */
 186         }
 187
 188         /* parse the results */
 189         scredp = NULL;
 190         if( servercredp != NULL ) {
 191                 rc = ldap_parse_sasl_bind_result( ld, result, &scredp, 0 );
 192         }
 193
 194         if ( rc != LDAP_SUCCESS && rc != LDAP_SASL_BIND_IN_PROGRESS ) {
 195                 ldap_msgfree( result );
 196                 return( rc );
 197         }
 198
 199         rc = ldap_result2error( ld, result, 1 );
 200
 201         if ( rc == LDAP_SUCCESS || rc == LDAP_SASL_BIND_IN_PROGRESS ) {
 202                 if( servercredp != NULL ) {
 203                         *servercredp = scredp;
 204                         scredp = NULL;
 205                 }
 206         }
 207
 208         if ( scredp != NULL ) {
 209                 ber_bvfree(scredp);
 210         }
 211
 212         return rc;
 213 }
 214
 215
 216 /*
 217 * Parse BindResponse:
 218 *
 219 *   BindResponse ::= [APPLICATION 1] SEQUENCE {
 220 *     COMPONENTS OF LDAPResult,
 221 *     serverSaslCreds  [7] OCTET STRING OPTIONAL }
 222 *
 223 *   LDAPResult ::= SEQUENCE {
 224 *     resultCode      ENUMERATED,
 225 *     matchedDN       LDAPDN,
 226 *     errorMessage    LDAPString,
 227 *     referral        [3] Referral OPTIONAL }
 228 */
 229
 230 int
 231 ldap_parse_sasl_bind_result(
 232         LDAP                    *ld,
 233         LDAPMessage             *res,
 234         struct berval   **servercredp,
 235         int                             freeit )
 236 {
 237         ber_int_t errcode;
 238         struct berval* scred;
 239
 240         ber_tag_t tag;
 241         BerElement      *ber;
 242
 243         Debug( LDAP_DEBUG_TRACE, "ldap_parse_sasl_bind_result\n", 0, 0, 0 );
 244
 245         assert( ld != NULL );
 246         assert( LDAP_VALID( ld ) );
 247         assert( res != NULL );
 248
 249         if ( ld == NULL || res == NULL ) {
 250                 return LDAP_PARAM_ERROR;
 251         }
 252
 253         if( servercredp != NULL ) {
 254                 if( ld->ld_version < LDAP_VERSION2 ) {
 255                         return LDAP_NOT_SUPPORTED;
 256                 }
 257                 *servercredp = NULL;
 258         }
 259
 260         if( res->lm_msgtype != LDAP_RES_BIND ) {
 261                 ld->ld_errno = LDAP_PARAM_ERROR;
 262                 return ld->ld_errno;
 263         }
 264
 265         scred = NULL;
 266
 267         if ( ld->ld_error ) {
 268                 LDAP_FREE( ld->ld_error );
 269                 ld->ld_error = NULL;
 270         }
 271         if ( ld->ld_matched ) {
 272                 LDAP_FREE( ld->ld_matched );
 273                 ld->ld_matched = NULL;
 274         }
 275
 276         /* parse results */
 277
 278         ber = ber_dup( res->lm_ber );
 279
 280         if( ber == NULL ) {
 281                 ld->ld_errno = LDAP_NO_MEMORY;
 282                 return ld->ld_errno;
 283         }
 284
 285         if ( ld->ld_version < LDAP_VERSION2 ) {
 286                 tag = ber_scanf( ber, "{ia}",
 287                         &errcode, &ld->ld_error );
 288
 289                 if( tag == LBER_ERROR ) {
 290                         ber_free( ber, 0 );
 291                         ld->ld_errno = LDAP_DECODING_ERROR;
 292                         return ld->ld_errno;
 293                 }
 294
 295         } else {
 296                 ber_len_t len;
 297
 298                 tag = ber_scanf( ber, "{iaa" /*}*/,
 299                         &errcode, &ld->ld_matched, &ld->ld_error );
 300
 301                 if( tag == LBER_ERROR ) {
 302                         ber_free( ber, 0 );
 303                         ld->ld_errno = LDAP_DECODING_ERROR;
 304                         return ld->ld_errno;
 305                 }
 306
 307                 tag = ber_peek_tag(ber, &len);
 308
 309                 if( tag == LDAP_TAG_REFERRAL ) {
 310                         /* skip 'em */
 311                         if( ber_scanf( ber, "x" ) == LBER_ERROR ) {
 312                                 ber_free( ber, 0 );
 313                                 ld->ld_errno = LDAP_DECODING_ERROR;
 314                                 return ld->ld_errno;
 315                         }
 316
 317                         tag = ber_peek_tag(ber, &len);
 318                 }
 319
 320                 if( tag == LDAP_TAG_SASL_RES_CREDS ) {
 321                         if( ber_scanf( ber, "O", &scred ) == LBER_ERROR ) {
 322                                 ber_free( ber, 0 );
 323                                 ld->ld_errno = LDAP_DECODING_ERROR;
 324                                 return ld->ld_errno;
 325                         }
 326                 }
 327         }
 328
 329         ber_free( ber, 0 );
 330
 331         if ( servercredp != NULL ) {
 332                 *servercredp = scred;
 333
 334         } else if ( scred != NULL ) {
 335                 ber_bvfree( scred );
 336         }
 337
 338         ld->ld_errno = errcode;
 339
 340         if ( freeit ) {
 341                 ldap_msgfree( res );
 342         }
 343
 344         return( ld->ld_errno );
 345 }
 346
 347 #ifdef HAVE_CYRUS_SASL
 348 /*
 349 * Various Cyrus SASL related stuff.
 350 */
 351
 352 static int sasl_setup( Sockbuf *sb, void *arg );
 353 static int sasl_remove( Sockbuf *sb );
 354 static ber_slen_t sasl_read( Sockbuf *sb, void *buf, ber_len_t len );
 355 static ber_slen_t sasl_write( Sockbuf *sb, void *buf, ber_len_t len );
 356 static int sasl_close( Sockbuf *sb );
 357
 358 static Sockbuf_IO sasl_io=
 359 {
 360 sasl_setup,
 361 sasl_remove,
 362 sasl_read,
 363 sasl_write,
 364 sasl_close
 365 };
 366
 367 #define HAS_SASL( sb ) ((sb)->sb_io==&sasl_io)
 368
 369 static char *
 370 array2str( char **a )
 371 {
 372         char *s, **v, *p;
 373         int len = 0;
 374
 375         for ( v = a; *v != NULL; v++ ) {
 376                 len += strlen( *v ) + 1; /* for a space */
 377         }
 378
 379         if ( len == 0 ) {
 380                 return NULL;
 381         }
 382
 383         s = LDAP_MALLOC ( len ); /* last space holds \0 */
 384
 385         if ( s == NULL ) {
 386                 return NULL;
 387         }
 388
 389         p = s;
 390         for ( v = a; *v != NULL; v++ ) {
 391                 int len;
 392
 393                 if ( v != a ) {
 394                         strncpy( p, " ", 1 );
 395                         ++p;
 396                 }
 397                 len = strlen( *v );
 398                 strncpy( p, *v, len );
 399                 p += len;
 400         }
 401
 402         *p = '\0';
 403
 404         return s;
 405 }
 406
 407 int ldap_pvt_sasl_init( void )
 408 {
 409         /* XXX not threadsafe */
 410         static int sasl_initialized = 0;
 411
 412         if ( sasl_initialized ) {
 413                 return 0;
 414         }
 415 #ifndef CSRIMALLOC
 416         sasl_set_alloc( ber_memalloc, ber_memcalloc, ber_memrealloc, ber_memfree );
 417 #endif /* CSRIMALLOC */
 418
 419         if ( sasl_client_init( NULL ) == SASL_OK ) {
 420                 sasl_initialized = 1;
 421                 return 0;
 422         }
 423
 424         return -1;
 425 }
 426
 427 int ldap_pvt_sasl_install( Sockbuf *sb, void *ctx_arg )
 428 {
 429         /* don't install the stuff unless security has been negotiated */
 430
 431         if ( !HAS_SASL( sb ) ) {
 432                 ber_pvt_sb_clear_io( sb );
 433                 ber_pvt_sb_set_io( sb, &sasl_io, ctx_arg );
 434         }
 435
 436         return 0;
 437 }
 438
 439 static int sasl_setup( Sockbuf *sb, void *arg )
 440 {
 441         sb->sb_iodata = arg;
 442         return 0;
 443 }
 444
 445 static int sasl_remove( Sockbuf *sb )
 446 {
 447         return 0;
 448 }
 449
 450 static ber_slen_t sasl_read( Sockbuf *sb, void *buf, ber_len_t buflen )
 451 {
 452         char *recv_tok;
 453         unsigned recv_tok_len;
 454         sasl_conn_t *conn = (sasl_conn_t *)sb->sb_iodata;
 455
 456         if ((ber_pvt_sb_io_tcp.sbi_read)( sb, buf, buflen ) != buflen ) {
 457                 return -1;
 458         }
 459
 460         if ( sasl_decode( conn, buf, buflen, &recv_tok, &recv_tok_len ) != SASL_OK ) {
 461                 return -1;
 462         }
 463
 464         if ( recv_tok_len > buflen ) {
 465                 LDAP_FREE( recv_tok );
 466                 return -1;
 467         }
 468
 469         memcpy( buf, recv_tok, recv_tok_len );
 470
 471         LDAP_FREE( recv_tok );
 472
 473         return recv_tok_len;
 474 }
 475
 476 static ber_slen_t sasl_write( Sockbuf *sb, void *buf, ber_len_t len )
 477 {
 478         char *wrapped_tok;
 479         unsigned wrapped_tok_len;
 480         sasl_conn_t *conn = (sasl_conn_t *)sb->sb_iodata;
 481
 482         if ( sasl_encode( conn, (const char *)buf, len,
 483                 &wrapped_tok, &wrapped_tok_len ) != SASL_OK ) {
 484                 return -1;
 485         }
 486
 487         if ((ber_pvt_sb_io_tcp.sbi_write)( sb, wrapped_tok, wrapped_tok_len ) != wrapped_tok_len ) {
 488                 LDAP_FREE( wrapped_tok );
 489                 return -1;
 490         }
 491
 492         LDAP_FREE( wrapped_tok );
 493
 494         return len;
 495 }
 496
 497 static int sasl_close( Sockbuf *sb )
 498 {
 499         (ber_pvt_sb_io_tcp.sbi_close)( sb );
 500 }
 501
 502 static int
 503 sasl_err2ldap( int saslerr )
 504 {
 505         int rc;
 506
 507         switch (saslerr) {
 508                 case SASL_CONTINUE:
 509                         rc = LDAP_MORE_RESULTS_TO_RETURN;
 510                         break;
 511                 case SASL_OK:
 512                         rc = LDAP_SUCCESS;
 513                         break;
 514                 case SASL_FAIL:
 515                         rc = LDAP_LOCAL_ERROR;
 516                         break;
 517                 case SASL_NOMEM:
 518                         rc = LDAP_NO_MEMORY;
 519                         break;
 520                 case SASL_NOMECH:
 521                         rc = LDAP_AUTH_UNKNOWN;
 522                         break;
 523                 case SASL_BADAUTH:
 524                         rc = LDAP_AUTH_UNKNOWN;
 525                         break;
 526                 case SASL_NOAUTHZ:
 527                         rc = LDAP_PARAM_ERROR;
 528                         break;
 529                 case SASL_TOOWEAK:
 530                 case SASL_ENCRYPT:
 531                         rc = LDAP_AUTH_UNKNOWN;
 532                         break;
 533                 default:
 534                         rc = LDAP_LOCAL_ERROR;
 535                         break;
 536         }
 537
 538         assert( rc == LDAP_SUCCESS || LDAP_API_ERROR( rc ) );
 539         return rc;
 540 }
 541
 542 int
 543 ldap_pvt_sasl_getmechs ( LDAP *ld, LDAP_CONST char *desired, char **pmechlist )
 544 {
 545         /* we need to query the server for supported mechs anyway */
 546         LDAPMessage *res, *e;
 547         char *attrs[] = { "supportedSASLMechanisms", NULL };
 548         char **values, *mechlist, **p;
 549         int rc;
 550
 551         rc = ldap_search_s( ld, NULL, LDAP_SCOPE_BASE,
 552                 NULL, attrs, 0, &res );
 553
 554         if ( rc != LDAP_SUCCESS ) {
 555                 return ld->ld_errno;
 556         }
 557
 558         e = ldap_first_entry( ld, res );
 559         if ( e == NULL ) {
 560                 if ( ld->ld_errno == LDAP_SUCCESS ) {
 561                         ld->ld_errno = LDAP_UNAVAILABLE;
 562                 }
 563                 return ld->ld_errno;
 564         }
 565
 566         values = ldap_get_values( ld, e, "supportedSASLMechanisms" );
 567         if ( values == NULL ) {
 568                 ld->ld_errno = LDAP_NO_SUCH_ATTRIBUTE;
 569                 ldap_msgfree( res );
 570                 return ld->ld_errno;
 571         }
 572
 573         if ( desired != NULL ) {
 574                 rc = LDAP_INAPPROPRIATE_AUTH;
 575
 576                 for ( p = values; *p != NULL; p++ ) {
 577                         if ( strcmp( *p, desired ) == 0 ) {
 578                                 rc = LDAP_SUCCESS;
 579                                 break;
 580                         }
 581                 }
 582
 583                 if ( rc == LDAP_SUCCESS ) {
 584                         /* just return this */
 585                         *pmechlist = LDAP_STRDUP( desired );
 586                         return LDAP_SUCCESS;
 587                 } else {
 588                         /* couldn't find it */
 589                         ld->ld_errno = LDAP_INAPPROPRIATE_AUTH;
 590                         return ld->ld_errno;
 591                 }
 592         }
 593
 594         mechlist = array2str( values );
 595         if ( mechlist == NULL ) {
 596                 ld->ld_errno = LDAP_NO_MEMORY;
 597                 ldap_value_free( values );
 598                 ldap_msgfree( res );
 599                 return ld->ld_errno;
 600         }
 601
 602         ldap_value_free( values );
 603         ldap_msgfree( res );
 604
 605         *pmechlist = mechlist;
 606
 607         return LDAP_SUCCESS;
 608 }
 609
 610 int
 611 ldap_pvt_sasl_bind(
 612         LDAP                    *ld,
 613         LDAP_CONST char         *dn,
 614         LDAP_CONST char         *mechanism,
 615         LDAP_CONST sasl_callback_t      *callbacks,
 616         LDAPControl             **sctrls,
 617         LDAPControl             **cctrls )
 618 {
 619         int     saslrc, rc, msgid, ssf = 0;
 620         struct berval ccred, *scred;
 621         char *mechlist = NULL;
 622         char *host;
 623         sasl_interact_t *client_interact = NULL;
 624
 625         Debug( LDAP_DEBUG_TRACE, "ldap_pvt_sasl_bind\n", 0, 0, 0 );
 626
 627         /* do a quick !LDAPv3 check... ldap_sasl_bind will do the rest. */
 628         if (ld->ld_version < LDAP_VERSION3) {
 629                 ld->ld_errno = LDAP_NOT_SUPPORTED;
 630                 return ld->ld_errno;
 631         }
 632
 633         /*
 634          * This connects to the host, side effect being that
 635          * ldap_host_connected_to() works.
 636          */
 637         rc = ldap_pvt_sasl_getmechs( ld, mechanism, &mechlist );
 638         if ( rc != LDAP_SUCCESS ) {
 639                 return ld->ld_errno;
 640         }
 641
 642         /* XXX this doesn't work with PF_LOCAL hosts */
 643         host = ldap_host_connected_to( &ld->ld_sb );
 644
 645         if ( host == NULL ) {
 646                 LDAP_FREE( mechlist );
 647                 ld->ld_errno = LDAP_UNAVAILABLE;
 648                 return ld->ld_errno;
 649         }
 650
 651         if ( ld->ld_sasl_context != NULL ) {
 652                 LDAP_FREE( mechlist );
 653                 sasl_dispose( &ld->ld_sasl_context );
 654         }
 655
 656         saslrc = sasl_client_new( "ldap", host, callbacks, 0, &ld->ld_sasl_context );
 657
 658         LDAP_FREE( host );
 659
 660         if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 661                 LDAP_FREE( mechlist );
 662                 ld->ld_errno = sasl_err2ldap( rc );
 663                 sasl_dispose( &ld->ld_sasl_context );
 664                 return ld->ld_errno;
 665         }
 666
 667         ccred.bv_val = NULL;
 668         ccred.bv_len = 0;
 669
 670         saslrc = sasl_client_start( ld->ld_sasl_context,
 671                 mechlist,
 672                 NULL,
 673                 &client_interact,
 674                 &ccred.bv_val,
 675                 (unsigned int *)&ccred.bv_len,
 676                 &mechanism );
 677
 678         LDAP_FREE( mechlist );
 679
 680         if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 681                 ld->ld_errno = sasl_err2ldap( saslrc );
 682                 sasl_dispose( &ld->ld_sasl_context );
 683                 return ld->ld_errno;
 684         }
 685
 686         scred = NULL;
 687
 688         do {
 689                 sasl_interact_t *client_interact = NULL;
 690
 691                 rc = ldap_sasl_bind_s( ld, dn, mechanism, &ccred, sctrls, cctrls, &scred );
 692                 if ( rc == LDAP_SUCCESS ) {
 693                         break;
 694                 } else if ( rc != LDAP_SASL_BIND_IN_PROGRESS ) {
 695                         if ( ccred.bv_val != NULL ) {
 696                                 LDAP_FREE( ccred.bv_val );
 697                         }
 698                         sasl_dispose( &ld->ld_sasl_context );
 699                         return ld->ld_errno;
 700                 }
 701
 702                 if ( ccred.bv_val != NULL ) {
 703                         LDAP_FREE( ccred.bv_val );
 704                         ccred.bv_val = NULL;
 705                 }
 706
 707                 saslrc = sasl_client_step( ld->ld_sasl_context,
 708                         (scred == NULL) ? NULL : scred->bv_val,
 709                         (scred == NULL) ? 0 : scred->bv_len,
 710                         &client_interact,
 711                         &ccred.bv_val,
 712                         (unsigned int *)&ccred.bv_len );
 713
 714                 ber_bvfree( scred );
 715
 716                 if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 717                         ld->ld_errno = sasl_err2ldap( saslrc );
 718                         sasl_dispose( &ld->ld_sasl_context );
 719                         return ld->ld_errno;
 720                 }
 721         } while ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 722
 723         assert ( rc == LDAP_SUCCESS );
 724
 725         if ( sasl_getprop( ld->ld_sasl_context, SASL_SSF, (void **)&ssf )
 726                 == SASL_OK && ssf ) {
 727                 ldap_pvt_sasl_install( &ld->ld_sb, ld->ld_sasl_context );
 728         }
 729
 730         return rc;
 731 }
 732
 733 /* based on sample/sample-client.c */
 734 static int
 735 ldap_pvt_sasl_getsecret(sasl_conn_t *conn, void *context, int id, sasl_secret_t **psecret)
 736 {
 737         struct berval *passphrase = (struct berval *)context;
 738         size_t len;
 739
 740         if ( conn == NULL || psecret == NULL || id != SASL_CB_PASS ) {
 741                 return SASL_BADPARAM;
 742         }
 743
 744         len = (passphrase != NULL) ? (size_t)passphrase->bv_len: 0;
 745
 746         *psecret = (sasl_secret_t *) LDAP_MALLOC( sizeof( sasl_secret_t ) + len );
 747         if ( *psecret == NULL ) {
 748                 return SASL_NOMEM;
 749         }
 750
 751         (*psecret)->len = passphrase->bv_len;
 752
 753         if ( passphrase != NULL ) {
 754                 memcpy((*psecret)->data, passphrase->bv_val, len);
 755         }
 756
 757         return SASL_OK;
 758 }
 759
 760 static int
 761 ldap_pvt_sasl_getsimple(void *context, int id, const char **result, int *len)
 762 {
 763         const char *value = (const char *)context;
 764
 765         if ( result == NULL ) {
 766                 return SASL_BADPARAM;
 767         }
 768
 769         switch ( id ) {
 770                 case SASL_CB_USER:
 771                 case SASL_CB_AUTHNAME:
 772                         *result = value;
 773                         if ( len )
 774                                 *len = value ? strlen( value ) : 0;
 775                         break;
 776                 case SASL_CB_LANGUAGE:
 777                         *result = NULL;
 778                         if ( len )
 779                                 *len = 0;
 780                         break;
 781                 default:
 782                         return SASL_BADPARAM;
 783         }
 784
 785         return SASL_OK;
 786 }
 787
 788 int
 789 ldap_pvt_sasl_get_option( LDAP *ld, int option, void *arg )
 790 {
 791         sasl_ssf_t      *ssf;
 792
 793         if ( ld == NULL )
 794                 return -1;
 795
 796         switch ( option ) {
 797                 case LDAP_OPT_X_SASL_MINSSF:
 798                         *(int *)arg = ld->ld_options.ldo_sasl_minssf;
 799                         break;
 800                 case LDAP_OPT_X_SASL_MAXSSF:
 801                         *(int *)arg = ld->ld_options.ldo_sasl_maxssf;
 802                         break;
 803                 case LDAP_OPT_X_SASL_ACTSSF:
 804                         if ( ld->ld_sasl_context == NULL ) {
 805                                 *(int *)arg = -1;
 806                                 break;
 807                         }
 808                         if ( sasl_getprop( ld->ld_sasl_context, SASL_SSF, &ssf )
 809                                         != SASL_OK )
 810                                 return -1;
 811                         *(int *)arg = *ssf;
 812                         break;
 813                 default:
 814                         return -1;
 815         }
 816         return 0;
 817 }
 818
 819 int
 820 ldap_pvt_sasl_set_option( LDAP *ld, int option, void *arg )
 821 {
 822         if ( ld == NULL )
 823                 return -1;
 824
 825         switch ( option ) {
 826                 case LDAP_OPT_X_SASL_MINSSF:
 827                         ld->ld_options.ldo_sasl_minssf = *(int *)arg;
 828                         break;
 829                 case LDAP_OPT_X_SASL_MAXSSF:
 830                         ld->ld_options.ldo_sasl_maxssf = *(int *)arg;
 831                         break;
 832                 case LDAP_OPT_X_SASL_ACTSSF:
 833                         /* This option is read-only */
 834                 default:
 835                         return -1;
 836         }
 837         return 0;
 838 }
 839
 840 /*
 841  * ldap_negotiated_sasl_bind_s - bind to the ldap server (and X.500)
 842  * using SASL authentication.
 843  *
 844  * This routine attempts to authenticate the user referred by the
 845  * authentication id using the provided password.  An optional
 846  * authorization identity may be provided.  An DN is generally not
 847  * provided [see AuthMethod].
 848  *
 849  * If the mechanism negotiated does not require a password, the
 850  * passwd field is ignored.  [A callback mechanism should really
 851  * be used].
 852  *
 853  * LDAP_SUCCESS is returned upon success, the ldap error code
 854  * otherwise.
 855  *
 856  * Examples:
 857  *      ldap_negotiated_sasl_bind_s( ld, NULL,
 858  *          "user@OPENLDAP.ORG", NULL, NULL,
 859  *              "GSSAPI", NULL, NULL, NULL );
 860  *
 861  *      ldap_negotiated_sasl_bind_s( ld, NULL,
 862  *          "manager", "cn=user,dc=openldap,dc=org", NULL,
 863  *              "DIGEST-MD5", NULL, NULL, NULL );
 864  *
 865  *      ldap_negotiated_sasl_bind_s( ld, NULL,
 866  *          "root@OPENLDAP.ORG", "u:user@OPENLDAP.ORG", NULL,
 867  *              "GSSAPI", NULL, NULL, NULL );
 868  *
 869  *      ldap_negotiated_sasl_bind_s( ld, NULL,
 870  *          "manager", "dn:cn=user,dc=openldap,dc=org", NULL,
 871  *              "DIGEST-MD5", NULL, NULL, NULL );
 872  */
 873 int
 874 ldap_negotiated_sasl_bind_s(
 875         LDAP *ld,
 876         LDAP_CONST char *dn, /* usually NULL */
 877         LDAP_CONST char *authenticationId,
 878         LDAP_CONST char *authorizationId, /* commonly NULL */
 879         LDAP_CONST char *saslMechanism,
 880         struct berval *passPhrase,
 881         LDAPControl **serverControls,
 882         LDAPControl **clientControls)
 883 {
 884         int n;
 885         sasl_callback_t callbacks[4];
 886         int rc;
 887
 888         /* SASL Authentication Identity */
 889         callbacks[n=0].id = SASL_CB_AUTHNAME;
 890         callbacks[n].proc = ldap_pvt_sasl_getsimple;
 891         callbacks[n].context = (void *)authenticationId;
 892
 893         /* SASL Authorization Identity (userid) */
 894         if( authorizationId != NULL ) {
 895                 callbacks[++n].id = SASL_CB_USER;
 896                 callbacks[n].proc = ldap_pvt_sasl_getsimple;
 897                 callbacks[n].context = (void *)authorizationId;
 898         }
 899
 900         callbacks[++n].id = SASL_CB_PASS;
 901         callbacks[n].proc = ldap_pvt_sasl_getsecret;
 902         callbacks[n].context = (void *)passPhrase;
 903
 904         callbacks[++n].id = SASL_CB_LIST_END;
 905         callbacks[n].proc = NULL;
 906         callbacks[n].context = NULL;
 907
 908         rc = ldap_pvt_sasl_bind(ld, dn, saslMechanism, callbacks,
 909                 serverControls, clientControls);
 910
 911         return rc;
 912 }
 913 #endif /* HAVE_CYRUS_SASL */