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, 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         Debug( LDAP_DEBUG_TRACE, "ldap_pvt_sasl_getmech\n", 0, 0, 0 );
 552
 553         rc = ldap_search_s( ld, NULL, LDAP_SCOPE_BASE,
 554                 NULL, attrs, 0, &res );
 555
 556         if ( rc != LDAP_SUCCESS ) {
 557                 return ld->ld_errno;
 558         }
 559
 560         e = ldap_first_entry( ld, res );
 561         if ( e == NULL ) {
 562                 if ( ld->ld_errno == LDAP_SUCCESS ) {
 563                         ld->ld_errno = LDAP_UNAVAILABLE;
 564                 }
 565                 return ld->ld_errno;
 566         }
 567
 568         values = ldap_get_values( ld, e, "supportedSASLMechanisms" );
 569         if ( values == NULL ) {
 570                 ld->ld_errno = LDAP_NO_SUCH_ATTRIBUTE;
 571                 ldap_msgfree( res );
 572                 return ld->ld_errno;
 573         }
 574
 575         mechlist = array2str( values );
 576         if ( mechlist == NULL ) {
 577                 ld->ld_errno = LDAP_NO_MEMORY;
 578                 ldap_value_free( values );
 579                 ldap_msgfree( res );
 580                 return ld->ld_errno;
 581         }
 582
 583         ldap_value_free( values );
 584         ldap_msgfree( res );
 585
 586         *pmechlist = mechlist;
 587
 588         return LDAP_SUCCESS;
 589 }
 590
 591 int
 592 ldap_pvt_sasl_bind(
 593         LDAP                    *ld,
 594         LDAP_CONST char         *dn,
 595         LDAP_CONST char         *mechs,
 596         LDAP_CONST sasl_callback_t      *callbacks,
 597         LDAPControl             **sctrls,
 598         LDAPControl             **cctrls )
 599 {
 600         const char *mech;
 601         int     saslrc, rc, msgid, ssf = 0;
 602         struct berval ccred, *scred;
 603         char *host;
 604         sasl_interact_t *client_interact = NULL;
 605
 606         Debug( LDAP_DEBUG_TRACE, "ldap_pvt_sasl_bind\n", 0, 0, 0 );
 607
 608         /* do a quick !LDAPv3 check... ldap_sasl_bind will do the rest. */
 609         if (ld->ld_version < LDAP_VERSION3) {
 610                 ld->ld_errno = LDAP_NOT_SUPPORTED;
 611                 return ld->ld_errno;
 612         }
 613
 614         if( ! ber_pvt_sb_in_use( &ld->ld_sb ) ) {
 615                 /* not connected yet */
 616                 int rc = ldap_open_defconn( ld );
 617
 618                 if( rc < 0 ) return ld->ld_errno;
 619         }
 620
 621         /* XXX this doesn't work with PF_LOCAL hosts */
 622         host = ldap_host_connected_to( &ld->ld_sb );
 623
 624         if ( host == NULL ) {
 625                 ld->ld_errno = LDAP_UNAVAILABLE;
 626                 return ld->ld_errno;
 627         }
 628
 629         if ( ld->ld_sasl_context != NULL ) {
 630                 sasl_dispose( &ld->ld_sasl_context );
 631         }
 632
 633         saslrc = sasl_client_new( "ldap", host, callbacks, 0, &ld->ld_sasl_context );
 634
 635         LDAP_FREE( host );
 636
 637         if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 638                 ld->ld_errno = sasl_err2ldap( rc );
 639                 sasl_dispose( &ld->ld_sasl_context );
 640                 return ld->ld_errno;
 641         }
 642
 643         ccred.bv_val = NULL;
 644         ccred.bv_len = 0;
 645
 646         saslrc = sasl_client_start( ld->ld_sasl_context,
 647                 mechs,
 648                 NULL,
 649                 &client_interact,
 650                 &ccred.bv_val,
 651                 (unsigned int *)&ccred.bv_len,
 652                 &mech );
 653
 654         if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 655                 ld->ld_errno = sasl_err2ldap( saslrc );
 656                 sasl_dispose( &ld->ld_sasl_context );
 657                 return ld->ld_errno;
 658         }
 659
 660         scred = NULL;
 661
 662         do {
 663                 sasl_interact_t *client_interact = NULL;
 664
 665                 rc = ldap_sasl_bind_s( ld, dn, mech, &ccred, sctrls, cctrls, &scred );
 666                 if ( rc == LDAP_SUCCESS ) {
 667                         break;
 668                 } else if ( rc != LDAP_SASL_BIND_IN_PROGRESS ) {
 669                         if ( ccred.bv_val != NULL ) {
 670                                 LDAP_FREE( ccred.bv_val );
 671                         }
 672                         sasl_dispose( &ld->ld_sasl_context );
 673                         return ld->ld_errno;
 674                 }
 675
 676                 if ( ccred.bv_val != NULL ) {
 677                         LDAP_FREE( ccred.bv_val );
 678                         ccred.bv_val = NULL;
 679                 }
 680
 681                 saslrc = sasl_client_step( ld->ld_sasl_context,
 682                         (scred == NULL) ? NULL : scred->bv_val,
 683                         (scred == NULL) ? 0 : scred->bv_len,
 684                         &client_interact,
 685                         &ccred.bv_val,
 686                         (unsigned int *)&ccred.bv_len );
 687
 688                 ber_bvfree( scred );
 689
 690                 if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 691                         ld->ld_errno = sasl_err2ldap( saslrc );
 692                         sasl_dispose( &ld->ld_sasl_context );
 693                         return ld->ld_errno;
 694                 }
 695         } while ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 696
 697         assert ( rc == LDAP_SUCCESS );
 698
 699         if ( sasl_getprop( ld->ld_sasl_context, SASL_SSF, (void **)&ssf )
 700                 == SASL_OK && ssf ) {
 701                 ldap_pvt_sasl_install( &ld->ld_sb, ld->ld_sasl_context );
 702         }
 703
 704         return rc;
 705 }
 706
 707 /* based on sample/sample-client.c */
 708 static int
 709 ldap_pvt_sasl_getsecret(sasl_conn_t *conn,
 710         void *context, int id, sasl_secret_t **psecret)
 711 {
 712         struct berval *passphrase = (struct berval *)context;
 713         size_t len;
 714
 715         if ( conn == NULL || psecret == NULL || id != SASL_CB_PASS ) {
 716                 return SASL_BADPARAM;
 717         }
 718
 719         len = (passphrase != NULL) ? (size_t)passphrase->bv_len: 0;
 720
 721         *psecret = (sasl_secret_t *) LDAP_MALLOC( sizeof( sasl_secret_t ) + len );
 722         if ( *psecret == NULL ) {
 723                 return SASL_NOMEM;
 724         }
 725
 726         (*psecret)->len = passphrase->bv_len;
 727
 728         if ( passphrase != NULL ) {
 729                 memcpy((*psecret)->data, passphrase->bv_val, len);
 730         }
 731
 732         return SASL_OK;
 733 }
 734
 735 static int
 736 ldap_pvt_sasl_getsimple(void *context, int id, const char **result, int *len)
 737 {
 738         const char *value = (const char *)context;
 739
 740         if ( result == NULL ) {
 741                 return SASL_BADPARAM;
 742         }
 743
 744         switch ( id ) {
 745                 case SASL_CB_USER:
 746                 case SASL_CB_AUTHNAME:
 747                         *result = value;
 748                         if ( len )
 749                                 *len = value ? strlen( value ) : 0;
 750                         break;
 751                 case SASL_CB_LANGUAGE:
 752                         *result = NULL;
 753                         if ( len )
 754                                 *len = 0;
 755                         break;
 756                 default:
 757                         return SASL_BADPARAM;
 758         }
 759
 760         return SASL_OK;
 761 }
 762
 763 int
 764 ldap_pvt_sasl_get_option( LDAP *ld, int option, void *arg )
 765 {
 766         sasl_ssf_t      *ssf;
 767
 768         if ( ld == NULL )
 769                 return -1;
 770
 771         switch ( option ) {
 772                 case LDAP_OPT_X_SASL_MINSSF:
 773                         *(int *)arg = ld->ld_options.ldo_sasl_minssf;
 774                         break;
 775                 case LDAP_OPT_X_SASL_MAXSSF:
 776                         *(int *)arg = ld->ld_options.ldo_sasl_maxssf;
 777                         break;
 778                 case LDAP_OPT_X_SASL_ACTSSF:
 779                         if ( ld->ld_sasl_context == NULL ) {
 780                                 *(int *)arg = -1;
 781                                 break;
 782                         }
 783                         if ( sasl_getprop( ld->ld_sasl_context, SASL_SSF,
 784                                 (void **) &ssf ) != SASL_OK )
 785                         {
 786                                 return -1;
 787                         }
 788                         *(int *)arg = *ssf;
 789                         break;
 790                 default:
 791                         return -1;
 792         }
 793         return 0;
 794 }
 795
 796 int
 797 ldap_pvt_sasl_set_option( LDAP *ld, int option, void *arg )
 798 {
 799         if ( ld == NULL )
 800                 return -1;
 801
 802         switch ( option ) {
 803                 case LDAP_OPT_X_SASL_MINSSF:
 804                         ld->ld_options.ldo_sasl_minssf = *(int *)arg;
 805                         break;
 806                 case LDAP_OPT_X_SASL_MAXSSF:
 807                         ld->ld_options.ldo_sasl_maxssf = *(int *)arg;
 808                         break;
 809                 case LDAP_OPT_X_SASL_ACTSSF:
 810                         /* This option is read-only */
 811                 default:
 812                         return -1;
 813         }
 814         return 0;
 815 }
 816
 817 /*
 818  * ldap_negotiated_sasl_bind_s - bind to the ldap server (and X.500)
 819  * using SASL authentication.
 820  *
 821  * This routine attempts to authenticate the user referred by the
 822  * authentication id using the provided password.  An optional
 823  * authorization identity may be provided.  An DN is generally not
 824  * provided [see AuthMethod].
 825  *
 826  * If the mechanism negotiated does not require a password, the
 827  * passwd field is ignored.  [A callback mechanism should really
 828  * be used].
 829  *
 830  * LDAP_SUCCESS is returned upon success, the ldap error code
 831  * otherwise.
 832  *
 833  * Examples:
 834  *      ldap_negotiated_sasl_bind_s( ld, NULL,
 835  *          NULL, NULL, NULL,
 836  *              NULL, NULL, NULL, NULL );
 837  *
 838  *      ldap_negotiated_sasl_bind_s( ld, NULL,
 839  *          "user@OPENLDAP.ORG", NULL, NULL,
 840  *              "GSSAPI", NULL, NULL, NULL );
 841  *
 842  *      ldap_negotiated_sasl_bind_s( ld, NULL,
 843  *          "manager", "dn:cn=user,dc=openldap,dc=org", NULL,
 844  *              "DIGEST-MD5", NULL, NULL, NULL );
 845  *
 846  *      ldap_negotiated_sasl_bind_s( ld, NULL,
 847  *          "root@OPENLDAP.ORG", "u:user@OPENLDAP.ORG", NULL,
 848  *              "GSSAPI", NULL, NULL, NULL );
 849  *
 850  *      ldap_negotiated_sasl_bind_s( ld, NULL,
 851  *          "manager", "dn:cn=user,dc=openldap,dc=org", NULL,
 852  *              "DIGEST-MD5", NULL, NULL, NULL );
 853  */
 854 int
 855 ldap_negotiated_sasl_bind_s(
 856         LDAP *ld,
 857         LDAP_CONST char *dn, /* usually NULL */
 858         LDAP_CONST char *authenticationId,
 859         LDAP_CONST char *authorizationId, /* commonly NULL */
 860         LDAP_CONST char *saslMechanism,
 861         struct berval *passPhrase,
 862         LDAPControl **serverControls,
 863         LDAPControl **clientControls)
 864 {
 865         int n;
 866         sasl_callback_t callbacks[4];
 867         int rc;
 868
 869         Debug( LDAP_DEBUG_TRACE, "ldap_negotiated_sasl_bind_s\n", 0, 0, 0 );
 870
 871         if( saslMechanism == NULL || *saslMechanism == '\0' ) {
 872                 char *mechs;
 873                 rc = ldap_pvt_sasl_getmechs( ld, &mechs );
 874
 875                 if( rc != LDAP_SUCCESS ) {
 876                         return rc;
 877                 }
 878
 879                 saslMechanism = mechs;
 880         }
 881
 882         /* SASL Authentication Identity */
 883         callbacks[n=0].id = SASL_CB_AUTHNAME;
 884         callbacks[n].proc = ldap_pvt_sasl_getsimple;
 885         callbacks[n].context = (void *)authenticationId;
 886
 887         /* SASL Authorization Identity (userid) */
 888         if( authorizationId != NULL ) {
 889                 callbacks[++n].id = SASL_CB_USER;
 890                 callbacks[n].proc = ldap_pvt_sasl_getsimple;
 891                 callbacks[n].context = (void *)authorizationId;
 892         }
 893
 894         callbacks[++n].id = SASL_CB_PASS;
 895         callbacks[n].proc = ldap_pvt_sasl_getsecret;
 896         callbacks[n].context = (void *)passPhrase;
 897
 898         callbacks[++n].id = SASL_CB_LIST_END;
 899         callbacks[n].proc = NULL;
 900         callbacks[n].context = NULL;
 901
 902         rc = ldap_pvt_sasl_bind(ld, dn, saslMechanism, callbacks,
 903                 serverControls, clientControls);
 904
 905         return rc;
 906 }
 907 #endif /* HAVE_CYRUS_SASL */