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

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1998-2004 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15
  16 #include "portable.h"
  17
  18 #include <stdio.h>
  19
  20 #include <ac/socket.h>
  21 #include <ac/stdlib.h>
  22 #include <ac/string.h>
  23 #include <ac/time.h>
  24 #include <ac/errno.h>
  25 #include <ac/ctype.h>
  26 #include <ac/unistd.h>
  27
  28 #include "ldap-int.h"
  29
  30 #ifdef HAVE_CYRUS_SASL
  31
  32 #ifdef LDAP_R_COMPILE
  33 ldap_pvt_thread_mutex_t ldap_int_sasl_mutex;
  34 #endif
  35
  36 #ifdef HAVE_SASL_SASL_H
  37 #include <sasl/sasl.h>
  38 #else
  39 #include <sasl.h>
  40 #endif
  41
  42 #if SASL_VERSION_MAJOR >= 2
  43 #define SASL_CONST const
  44 #else
  45 #define SASL_CONST
  46 #endif
  47
  48 /*
  49 * Various Cyrus SASL related stuff.
  50 */
  51
  52 static const sasl_callback_t client_callbacks[] = {
  53 #ifdef SASL_CB_GETREALM
  54         { SASL_CB_GETREALM, NULL, NULL },
  55 #endif
  56         { SASL_CB_USER, NULL, NULL },
  57         { SASL_CB_AUTHNAME, NULL, NULL },
  58         { SASL_CB_PASS, NULL, NULL },
  59         { SASL_CB_ECHOPROMPT, NULL, NULL },
  60         { SASL_CB_NOECHOPROMPT, NULL, NULL },
  61         { SASL_CB_LIST_END, NULL, NULL }
  62 };
  63
  64 int ldap_int_sasl_init( void )
  65 {
  66         /* XXX not threadsafe */
  67         static int sasl_initialized = 0;
  68
  69 #ifdef HAVE_SASL_VERSION
  70         /* stringify the version number, sasl.h doesn't do it for us */
  71 #define VSTR0(maj, min, pat)    #maj "." #min "." #pat
  72 #define VSTR(maj, min, pat)     VSTR0(maj, min, pat)
  73 #define SASL_VERSION_STRING     VSTR(SASL_VERSION_MAJOR, SASL_VERSION_MINOR, \
  74                                 SASL_VERSION_STEP)
  75         { int rc;
  76         sasl_version( NULL, &rc );
  77         if ( ((rc >> 16) != ((SASL_VERSION_MAJOR << 8)|SASL_VERSION_MINOR)) ||
  78                 (rc & 0xffff) < SASL_VERSION_STEP) {
  79                 char version[sizeof("xxx.xxx.xxxxx")];
  80                 sprintf( version, "%u.%d.%d", (unsigned)rc >> 24, (rc >> 16) & 0xff,
  81                         rc & 0xffff );
  82
  83 #ifdef NEW_LOGGING
  84                 LDAP_LOG( TRANSPORT, INFO,
  85                 "ldap_int_sasl_init: SASL library version mismatch:"
  86                 " expected " SASL_VERSION_STRING ","
  87                 " got %s\n", version, 0, 0 );
  88 #else
  89                 Debug( LDAP_DEBUG_ANY,
  90                 "ldap_int_sasl_init: SASL library version mismatch:"
  91                 " expected " SASL_VERSION_STRING ","
  92                 " got %s\n", version, 0, 0 );
  93 #endif
  94                 return -1;
  95         }
  96         }
  97 #endif
  98         if ( sasl_initialized ) {
  99                 return 0;
 100         }
 101
 102 /* SASL 2 takes care of its own memory completely internally */
 103 #if SASL_VERSION_MAJOR < 2 && !defined(CSRIMALLOC)
 104         sasl_set_alloc(
 105                 ber_memalloc,
 106                 ber_memcalloc,
 107                 ber_memrealloc,
 108                 ber_memfree );
 109 #endif /* CSRIMALLOC */
 110
 111 #ifdef LDAP_R_COMPILE
 112         sasl_set_mutex(
 113                 ldap_pvt_sasl_mutex_new,
 114                 ldap_pvt_sasl_mutex_lock,
 115                 ldap_pvt_sasl_mutex_unlock,
 116                 ldap_pvt_sasl_mutex_dispose );
 117
 118         ldap_pvt_thread_mutex_init( &ldap_int_sasl_mutex );
 119 #endif
 120
 121         if ( sasl_client_init( NULL ) == SASL_OK ) {
 122                 sasl_initialized = 1;
 123                 return 0;
 124         }
 125
 126 #if SASL_VERSION_MAJOR < 2
 127         /* A no-op to make sure we link with Cyrus 1.5 */
 128         sasl_client_auth( NULL, NULL, NULL, 0, NULL, NULL );
 129 #endif
 130         return -1;
 131 }
 132
 133 /*
 134  * SASL encryption support for LBER Sockbufs
 135  */
 136
 137 struct sb_sasl_data {
 138         sasl_conn_t             *sasl_context;
 139         unsigned                *sasl_maxbuf;
 140         Sockbuf_Buf             sec_buf_in;
 141         Sockbuf_Buf             buf_in;
 142         Sockbuf_Buf             buf_out;
 143 };
 144
 145 static int
 146 sb_sasl_setup( Sockbuf_IO_Desc *sbiod, void *arg )
 147 {
 148         struct sb_sasl_data     *p;
 149
 150         assert( sbiod != NULL );
 151
 152         p = LBER_MALLOC( sizeof( *p ) );
 153         if ( p == NULL )
 154                 return -1;
 155         p->sasl_context = (sasl_conn_t *)arg;
 156         ber_pvt_sb_buf_init( &p->sec_buf_in );
 157         ber_pvt_sb_buf_init( &p->buf_in );
 158         ber_pvt_sb_buf_init( &p->buf_out );
 159         if ( ber_pvt_sb_grow_buffer( &p->sec_buf_in, SASL_MIN_BUFF_SIZE ) < 0 ) {
 160                 LBER_FREE( p );
 161                 errno = ENOMEM;
 162                 return -1;
 163         }
 164         sasl_getprop( p->sasl_context, SASL_MAXOUTBUF,
 165                 (SASL_CONST void **) &p->sasl_maxbuf );
 166
 167         sbiod->sbiod_pvt = p;
 168
 169         return 0;
 170 }
 171
 172 static int
 173 sb_sasl_remove( Sockbuf_IO_Desc *sbiod )
 174 {
 175         struct sb_sasl_data     *p;
 176
 177         assert( sbiod != NULL );
 178
 179         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 180 #if SASL_VERSION_MAJOR >= 2
 181         /*
 182          * SASLv2 encode/decode buffers are managed by
 183          * libsasl2. Ensure they are not freed by liblber.
 184          */
 185         p->buf_in.buf_base = NULL;
 186         p->buf_out.buf_base = NULL;
 187 #endif
 188         ber_pvt_sb_buf_destroy( &p->sec_buf_in );
 189         ber_pvt_sb_buf_destroy( &p->buf_in );
 190         ber_pvt_sb_buf_destroy( &p->buf_out );
 191         LBER_FREE( p );
 192         sbiod->sbiod_pvt = NULL;
 193         return 0;
 194 }
 195
 196 static ber_len_t
 197 sb_sasl_pkt_length( const unsigned char *buf, int debuglevel )
 198 {
 199         ber_len_t               size;
 200
 201         assert( buf != NULL );
 202
 203         size = buf[0] << 24
 204                 | buf[1] << 16
 205                 | buf[2] << 8
 206                 | buf[3];
 207
 208         if ( size > SASL_MAX_BUFF_SIZE ) {
 209                 /* somebody is trying to mess me up. */
 210                 ber_log_printf( LDAP_DEBUG_ANY, debuglevel,
 211                         "sb_sasl_pkt_length: received illegal packet length "
 212                         "of %lu bytes\n", (unsigned long)size );
 213                 size = 16; /* this should lead to an error. */
 214         }
 215
 216         return size + 4; /* include the size !!! */
 217 }
 218
 219 /* Drop a processed packet from the input buffer */
 220 static void
 221 sb_sasl_drop_packet ( Sockbuf_Buf *sec_buf_in, int debuglevel )
 222 {
 223         ber_slen_t                      len;
 224
 225         len = sec_buf_in->buf_ptr - sec_buf_in->buf_end;
 226         if ( len > 0 )
 227                 AC_MEMCPY( sec_buf_in->buf_base, sec_buf_in->buf_base +
 228                         sec_buf_in->buf_end, len );
 229
 230         if ( len >= 4 ) {
 231                 sec_buf_in->buf_end = sb_sasl_pkt_length(
 232                         (unsigned char *) sec_buf_in->buf_base, debuglevel);
 233         }
 234         else {
 235                 sec_buf_in->buf_end = 0;
 236         }
 237         sec_buf_in->buf_ptr = len;
 238 }
 239
 240 static ber_slen_t
 241 sb_sasl_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
 242 {
 243         struct sb_sasl_data     *p;
 244         ber_slen_t              ret, bufptr;
 245
 246         assert( sbiod != NULL );
 247         assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
 248
 249         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 250
 251         /* Are there anything left in the buffer? */
 252         ret = ber_pvt_sb_copy_out( &p->buf_in, buf, len );
 253         bufptr = ret;
 254         len -= ret;
 255
 256         if ( len == 0 )
 257                 return bufptr;
 258
 259 #if SASL_VERSION_MAJOR >= 2
 260         ber_pvt_sb_buf_init( &p->buf_in );
 261 #else
 262         ber_pvt_sb_buf_destroy( &p->buf_in );
 263 #endif
 264
 265         /* Read the length of the packet */
 266         while ( p->sec_buf_in.buf_ptr < 4 ) {
 267                 ret = LBER_SBIOD_READ_NEXT( sbiod, p->sec_buf_in.buf_base,
 268                         4 - p->sec_buf_in.buf_ptr );
 269 #ifdef EINTR
 270                 if ( ( ret < 0 ) && ( errno == EINTR ) )
 271                         continue;
 272 #endif
 273                 if ( ret <= 0 )
 274                         return bufptr ? bufptr : ret;
 275
 276                 p->sec_buf_in.buf_ptr += ret;
 277         }
 278
 279         /* The new packet always starts at p->sec_buf_in.buf_base */
 280         ret = sb_sasl_pkt_length( (unsigned char *) p->sec_buf_in.buf_base,
 281                 sbiod->sbiod_sb->sb_debug );
 282
 283         /* Grow the packet buffer if neccessary */
 284         if ( ( p->sec_buf_in.buf_size < (ber_len_t) ret ) &&
 285                 ber_pvt_sb_grow_buffer( &p->sec_buf_in, ret ) < 0 )
 286         {
 287                 errno = ENOMEM;
 288                 return -1;
 289         }
 290         p->sec_buf_in.buf_end = ret;
 291
 292         /* Did we read the whole encrypted packet? */
 293         while ( p->sec_buf_in.buf_ptr < p->sec_buf_in.buf_end ) {
 294                 /* No, we have got only a part of it */
 295                 ret = p->sec_buf_in.buf_end - p->sec_buf_in.buf_ptr;
 296
 297                 ret = LBER_SBIOD_READ_NEXT( sbiod, p->sec_buf_in.buf_base +
 298                         p->sec_buf_in.buf_ptr, ret );
 299 #ifdef EINTR
 300                 if ( ( ret < 0 ) && ( errno == EINTR ) )
 301                         continue;
 302 #endif
 303                 if ( ret <= 0 )
 304                         return bufptr ? bufptr : ret;
 305
 306                 p->sec_buf_in.buf_ptr += ret;
 307         }
 308
 309         /* Decode the packet */
 310         ret = sasl_decode( p->sasl_context, p->sec_buf_in.buf_base,
 311                 p->sec_buf_in.buf_end,
 312                 (SASL_CONST char **)&p->buf_in.buf_base,
 313                 (unsigned *)&p->buf_in.buf_end );
 314
 315         /* Drop the packet from the input buffer */
 316         sb_sasl_drop_packet( &p->sec_buf_in, sbiod->sbiod_sb->sb_debug );
 317
 318         if ( ret != SASL_OK ) {
 319                 ber_log_printf( LDAP_DEBUG_ANY, sbiod->sbiod_sb->sb_debug,
 320                         "sb_sasl_read: failed to decode packet: %s\n",
 321                         sasl_errstring( ret, NULL, NULL ) );
 322                 errno = EIO;
 323                 return -1;
 324         }
 325
 326         p->buf_in.buf_size = p->buf_in.buf_end;
 327
 328         bufptr += ber_pvt_sb_copy_out( &p->buf_in, (char*) buf + bufptr, len );
 329
 330         return bufptr;
 331 }
 332
 333 static ber_slen_t
 334 sb_sasl_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
 335 {
 336         struct sb_sasl_data     *p;
 337         int                     ret;
 338
 339         assert( sbiod != NULL );
 340         assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
 341
 342         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 343
 344         /* Are there anything left in the buffer? */
 345         if ( p->buf_out.buf_ptr != p->buf_out.buf_end ) {
 346                 ret = ber_pvt_sb_do_write( sbiod, &p->buf_out );
 347                 if ( ret < 0 )
 348                         return ret;
 349                 /* Still have something left?? */
 350                 if ( p->buf_out.buf_ptr != p->buf_out.buf_end ) {
 351                         errno = EAGAIN;
 352                         return 0;
 353                 }
 354         }
 355
 356         /* now encode the next packet. */
 357 #if SASL_VERSION_MAJOR >= 2
 358         ber_pvt_sb_buf_init( &p->buf_out );
 359 #else
 360         ber_pvt_sb_buf_destroy( &p->buf_out );
 361 #endif
 362         if ( len > *p->sasl_maxbuf - 100 )
 363                 len = *p->sasl_maxbuf - 100;    /* For safety margin */
 364         ret = sasl_encode( p->sasl_context, buf, len,
 365                 (SASL_CONST char **)&p->buf_out.buf_base,
 366                 (unsigned *)&p->buf_out.buf_size );
 367         if ( ret != SASL_OK ) {
 368                 ber_log_printf( LDAP_DEBUG_ANY, sbiod->sbiod_sb->sb_debug,
 369                         "sb_sasl_write: failed to encode packet: %s\n",
 370                         sasl_errstring( ret, NULL, NULL ) );
 371                 return -1;
 372         }
 373         p->buf_out.buf_end = p->buf_out.buf_size;
 374
 375         ret = ber_pvt_sb_do_write( sbiod, &p->buf_out );
 376         if ( ret <= 0 )
 377                 return ret;
 378         return len;
 379 }
 380
 381 static int
 382 sb_sasl_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
 383 {
 384         struct sb_sasl_data     *p;
 385
 386         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 387
 388         if ( opt == LBER_SB_OPT_DATA_READY ) {
 389                 if ( p->buf_in.buf_ptr != p->buf_in.buf_end )
 390                         return 1;
 391         }
 392
 393         return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
 394 }
 395
 396 Sockbuf_IO ldap_pvt_sockbuf_io_sasl = {
 397         sb_sasl_setup,          /* sbi_setup */
 398         sb_sasl_remove,         /* sbi_remove */
 399         sb_sasl_ctrl,           /* sbi_ctrl */
 400         sb_sasl_read,           /* sbi_read */
 401         sb_sasl_write,          /* sbi_write */
 402         NULL                    /* sbi_close */
 403 };
 404
 405 int ldap_pvt_sasl_install( Sockbuf *sb, void *ctx_arg )
 406 {
 407 #ifdef NEW_LOGGING
 408         LDAP_LOG ( TRANSPORT, ENTRY, "ldap_pvt_sasl_install\n", 0, 0, 0 );
 409 #else
 410         Debug( LDAP_DEBUG_TRACE, "ldap_pvt_sasl_install\n",
 411                 0, 0, 0 );
 412 #endif
 413
 414         /* don't install the stuff unless security has been negotiated */
 415
 416         if ( !ber_sockbuf_ctrl( sb, LBER_SB_OPT_HAS_IO,
 417                         &ldap_pvt_sockbuf_io_sasl ) )
 418         {
 419 #ifdef LDAP_DEBUG
 420                 ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
 421                         LBER_SBIOD_LEVEL_APPLICATION, (void *)"sasl_" );
 422 #endif
 423                 ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_sasl,
 424                         LBER_SBIOD_LEVEL_APPLICATION, ctx_arg );
 425         }
 426
 427         return LDAP_SUCCESS;
 428 }
 429
 430 void ldap_pvt_sasl_remove( Sockbuf *sb )
 431 {
 432         ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_sasl,
 433                 LBER_SBIOD_LEVEL_APPLICATION );
 434 #ifdef LDAP_DEBUG
 435         ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
 436                 LBER_SBIOD_LEVEL_APPLICATION );
 437 #endif
 438 }
 439
 440 static int
 441 sasl_err2ldap( int saslerr )
 442 {
 443         int rc;
 444
 445         switch (saslerr) {
 446                 case SASL_CONTINUE:
 447                         rc = LDAP_MORE_RESULTS_TO_RETURN;
 448                         break;
 449                 case SASL_INTERACT:
 450                         rc = LDAP_LOCAL_ERROR;
 451                         break;
 452                 case SASL_OK:
 453                         rc = LDAP_SUCCESS;
 454                         break;
 455                 case SASL_FAIL:
 456                         rc = LDAP_LOCAL_ERROR;
 457                         break;
 458                 case SASL_NOMEM:
 459                         rc = LDAP_NO_MEMORY;
 460                         break;
 461                 case SASL_NOMECH:
 462                         rc = LDAP_AUTH_UNKNOWN;
 463                         break;
 464                 case SASL_BADAUTH:
 465                         rc = LDAP_AUTH_UNKNOWN;
 466                         break;
 467                 case SASL_NOAUTHZ:
 468                         rc = LDAP_PARAM_ERROR;
 469                         break;
 470                 case SASL_TOOWEAK:
 471                 case SASL_ENCRYPT:
 472                         rc = LDAP_AUTH_UNKNOWN;
 473                         break;
 474                 default:
 475                         rc = LDAP_LOCAL_ERROR;
 476                         break;
 477         }
 478
 479         assert( rc == LDAP_SUCCESS || LDAP_API_ERROR( rc ) );
 480         return rc;
 481 }
 482
 483 int
 484 ldap_int_sasl_open(
 485         LDAP *ld,
 486         LDAPConn *lc,
 487         const char * host )
 488 {
 489         int rc;
 490         sasl_conn_t *ctx;
 491
 492         assert( lc->lconn_sasl_authctx == NULL );
 493
 494         if ( host == NULL ) {
 495                 ld->ld_errno = LDAP_LOCAL_ERROR;
 496                 return ld->ld_errno;
 497         }
 498
 499         if ( ldap_int_sasl_init() ) {
 500                 ld->ld_errno = LDAP_LOCAL_ERROR;
 501                 return ld->ld_errno;
 502         }
 503
 504 #if SASL_VERSION_MAJOR >= 2
 505         rc = sasl_client_new( "ldap", host, NULL, NULL,
 506                 client_callbacks, 0, &ctx );
 507 #else
 508         rc = sasl_client_new( "ldap", host, client_callbacks,
 509                 SASL_SECURITY_LAYER, &ctx );
 510 #endif
 511
 512         if ( rc != SASL_OK ) {
 513                 ld->ld_errno = sasl_err2ldap( rc );
 514                 return ld->ld_errno;
 515         }
 516
 517 #ifdef NEW_LOGGING
 518         LDAP_LOG ( TRANSPORT, DETAIL1, "ldap_int_sasl_open: host=%s\n",
 519                 host, 0, 0 );
 520 #else
 521         Debug( LDAP_DEBUG_TRACE, "ldap_int_sasl_open: host=%s\n",
 522                 host, 0, 0 );
 523 #endif
 524
 525         lc->lconn_sasl_authctx = ctx;
 526
 527         return LDAP_SUCCESS;
 528 }
 529
 530 int ldap_int_sasl_close( LDAP *ld, LDAPConn *lc )
 531 {
 532         sasl_conn_t *ctx = lc->lconn_sasl_authctx;
 533
 534         if( ctx != NULL ) {
 535                 sasl_dispose( &ctx );
 536                 if ( lc->lconn_sasl_sockctx &&
 537                         lc->lconn_sasl_authctx != lc->lconn_sasl_sockctx ) {
 538                         ctx = lc->lconn_sasl_sockctx;
 539                         sasl_dispose( &ctx );
 540                 }
 541                 lc->lconn_sasl_sockctx = NULL;
 542                 lc->lconn_sasl_authctx = NULL;
 543         }
 544
 545         return LDAP_SUCCESS;
 546 }
 547
 548 int
 549 ldap_int_sasl_bind(
 550         LDAP                    *ld,
 551         const char              *dn,
 552         const char              *mechs,
 553         LDAPControl             **sctrls,
 554         LDAPControl             **cctrls,
 555         unsigned                flags,
 556         LDAP_SASL_INTERACT_PROC *interact,
 557         void * defaults )
 558 {
 559         char *data;
 560         const char *mech = NULL;
 561         const char *pmech = NULL;
 562         int                     saslrc, rc;
 563         sasl_ssf_t              *ssf = NULL;
 564         sasl_conn_t     *ctx, *oldctx = NULL;
 565         sasl_interact_t *prompts = NULL;
 566         unsigned credlen;
 567         struct berval ccred;
 568         ber_socket_t            sd;
 569         void    *ssl;
 570
 571 #ifdef NEW_LOGGING
 572         LDAP_LOG ( TRANSPORT, ARGS, "ldap_int_sasl_bind: %s\n",
 573                 mechs ? mechs : "<null>", 0, 0 );
 574 #else
 575         Debug( LDAP_DEBUG_TRACE, "ldap_int_sasl_bind: %s\n",
 576                 mechs ? mechs : "<null>", 0, 0 );
 577 #endif
 578
 579         /* do a quick !LDAPv3 check... ldap_sasl_bind will do the rest. */
 580         if (ld->ld_version < LDAP_VERSION3) {
 581                 ld->ld_errno = LDAP_NOT_SUPPORTED;
 582                 return ld->ld_errno;
 583         }
 584
 585         ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, &sd );
 586
 587         if ( sd == AC_SOCKET_INVALID ) {
 588                 /* not connected yet */
 589                 int rc;
 590
 591                 rc = ldap_open_defconn( ld );
 592                 if( rc < 0 ) return ld->ld_errno;
 593
 594                 ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, &sd );
 595
 596                 if( sd == AC_SOCKET_INVALID ) {
 597                         ld->ld_errno = LDAP_LOCAL_ERROR;
 598                         return ld->ld_errno;
 599                 }
 600         }
 601
 602         oldctx = ld->ld_defconn->lconn_sasl_authctx;
 603
 604         /* If we already have an authentication context, clear it out */
 605         if( oldctx ) {
 606                 if ( oldctx != ld->ld_defconn->lconn_sasl_sockctx ) {
 607                         sasl_dispose( &oldctx );
 608                 }
 609                 ld->ld_defconn->lconn_sasl_authctx = NULL;
 610         }
 611
 612         { char *saslhost = ldap_host_connected_to( ld->ld_sb, "localhost" );
 613         rc = ldap_int_sasl_open( ld, ld->ld_defconn, saslhost );
 614         LDAP_FREE( saslhost );
 615         }
 616
 617         if ( rc != LDAP_SUCCESS ) return rc;
 618
 619         ctx = ld->ld_defconn->lconn_sasl_authctx;
 620
 621         /* Check for TLS */
 622         ssl = ldap_pvt_tls_sb_ctx( ld->ld_sb );
 623         if ( ssl ) {
 624                 struct berval authid = BER_BVNULL;
 625                 ber_len_t fac;
 626
 627                 fac = ldap_pvt_tls_get_strength( ssl );
 628                 /* failure is OK, we just can't use SASL EXTERNAL */
 629                 (void) ldap_pvt_tls_get_my_dn( ssl, &authid, NULL, 0 );
 630
 631                 (void) ldap_int_sasl_external( ld, ld->ld_defconn, authid.bv_val, fac );
 632                 LDAP_FREE( authid.bv_val );
 633         }
 634
 635 #if !defined(_WIN32)
 636         /* Check for local */
 637         if ( ldap_pvt_url_scheme2proto( ld->ld_defconn->lconn_server->lud_scheme ) == LDAP_PROTO_IPC ) {
 638                 char authid[sizeof("uidNumber=4294967295+gidNumber=4294967295,"
 639                         "cn=peercred,cn=external,cn=auth")];
 640                 sprintf( authid, "uidNumber=%d+gidNumber=%d,"
 641                         "cn=peercred,cn=external,cn=auth",
 642                         (int) geteuid(), (int) getegid() );
 643                 (void) ldap_int_sasl_external( ld, ld->ld_defconn, authid, LDAP_PVT_SASL_LOCAL_SSF );
 644         }
 645 #endif
 646
 647         /* (re)set security properties */
 648         sasl_setprop( ctx, SASL_SEC_PROPS,
 649                 &ld->ld_options.ldo_sasl_secprops );
 650
 651         ccred.bv_val = NULL;
 652         ccred.bv_len = 0;
 653
 654         do {
 655                 saslrc = sasl_client_start( ctx,
 656                         mechs,
 657 #if SASL_VERSION_MAJOR < 2
 658                         NULL,
 659 #endif
 660                         &prompts,
 661                         (SASL_CONST char **)&ccred.bv_val,
 662                         &credlen,
 663                         &mech );
 664
 665                 if( pmech == NULL && mech != NULL ) {
 666                         pmech = mech;
 667
 668                         if( flags != LDAP_SASL_QUIET ) {
 669                                 fprintf(stderr,
 670                                         "SASL/%s authentication started\n",
 671                                         pmech );
 672                         }
 673                 }
 674
 675                 if( saslrc == SASL_INTERACT ) {
 676                         int res;
 677                         if( !interact ) break;
 678                         res = (interact)( ld, flags, defaults, prompts );
 679
 680                         if( res != LDAP_SUCCESS ) break;
 681                 }
 682         } while ( saslrc == SASL_INTERACT );
 683
 684         ccred.bv_len = credlen;
 685
 686         if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 687                 rc = ld->ld_errno = sasl_err2ldap( saslrc );
 688 #if SASL_VERSION_MAJOR >= 2
 689                 ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 690 #endif
 691                 goto done;
 692         }
 693
 694         do {
 695                 struct berval *scred;
 696                 unsigned credlen;
 697
 698                 scred = NULL;
 699
 700                 rc = ldap_sasl_bind_s( ld, dn, mech, &ccred, sctrls, cctrls, &scred );
 701
 702                 if ( ccred.bv_val != NULL ) {
 703 #if SASL_VERSION_MAJOR < 2
 704                         LDAP_FREE( ccred.bv_val );
 705 #endif
 706                         ccred.bv_val = NULL;
 707                 }
 708
 709                 if ( rc != LDAP_SUCCESS && rc != LDAP_SASL_BIND_IN_PROGRESS ) {
 710                         if( scred && scred->bv_len ) {
 711                                 /* and server provided us with data? */
 712 #ifdef NEW_LOGGING
 713                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 714                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 715                                         rc, saslrc, scred->bv_len );
 716 #else
 717                                 Debug( LDAP_DEBUG_TRACE,
 718                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 719                                         rc, saslrc, scred->bv_len );
 720 #endif
 721                                 ber_bvfree( scred );
 722                         }
 723                         rc = ld->ld_errno;
 724                         goto done;
 725                 }
 726
 727                 if( rc == LDAP_SUCCESS && saslrc == SASL_OK ) {
 728                         /* we're done, no need to step */
 729                         if( scred && scred->bv_len ) {
 730                                 /* but server provided us with data! */
 731 #ifdef NEW_LOGGING
 732                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 733                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 734                                         rc, saslrc, scred->bv_len );
 735 #else
 736                                 Debug( LDAP_DEBUG_TRACE,
 737                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 738                                         rc, saslrc, scred->bv_len );
 739 #endif
 740                                 ber_bvfree( scred );
 741                                 rc = ld->ld_errno = LDAP_LOCAL_ERROR;
 742                                 goto done;
 743                         }
 744                         break;
 745                 }
 746
 747                 do {
 748                         saslrc = sasl_client_step( ctx,
 749                                 (scred == NULL) ? NULL : scred->bv_val,
 750                                 (scred == NULL) ? 0 : scred->bv_len,
 751                                 &prompts,
 752                                 (SASL_CONST char **)&ccred.bv_val,
 753                                 &credlen );
 754
 755 #ifdef NEW_LOGGING
 756                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 757                                         "ldap_int_sasl_bind: sasl_client_step: %d\n", saslrc,0,0 );
 758 #else
 759                         Debug( LDAP_DEBUG_TRACE, "sasl_client_step: %d\n",
 760                                 saslrc, 0, 0 );
 761 #endif
 762
 763                         if( saslrc == SASL_INTERACT ) {
 764                                 int res;
 765                                 if( !interact ) break;
 766                                 res = (interact)( ld, flags, defaults, prompts );
 767                                 if( res != LDAP_SUCCESS ) break;
 768                         }
 769                 } while ( saslrc == SASL_INTERACT );
 770
 771                 ccred.bv_len = credlen;
 772                 ber_bvfree( scred );
 773
 774                 if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 775                         ld->ld_errno = sasl_err2ldap( saslrc );
 776 #if SASL_VERSION_MAJOR >= 2
 777                         ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 778 #endif
 779                         rc = ld->ld_errno;
 780                         goto done;
 781                 }
 782         } while ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 783
 784         if ( rc != LDAP_SUCCESS ) goto done;
 785
 786         if ( saslrc != SASL_OK ) {
 787 #if SASL_VERSION_MAJOR >= 2
 788                 ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 789 #endif
 790                 rc = ld->ld_errno = sasl_err2ldap( saslrc );
 791                 goto done;
 792         }
 793
 794         if( flags != LDAP_SASL_QUIET ) {
 795                 saslrc = sasl_getprop( ctx, SASL_USERNAME, (SASL_CONST void **) &data );
 796                 if( saslrc == SASL_OK && data && *data ) {
 797                         fprintf( stderr, "SASL username: %s\n", data );
 798                 }
 799
 800 #if SASL_VERSION_MAJOR < 2
 801                 saslrc = sasl_getprop( ctx, SASL_REALM, (SASL_CONST void **) &data );
 802                 if( saslrc == SASL_OK && data && *data ) {
 803                         fprintf( stderr, "SASL realm: %s\n", data );
 804                 }
 805 #endif
 806         }
 807
 808         saslrc = sasl_getprop( ctx, SASL_SSF, (SASL_CONST void **) &ssf );
 809         if( saslrc == SASL_OK ) {
 810                 if( flags != LDAP_SASL_QUIET ) {
 811                         fprintf( stderr, "SASL SSF: %lu\n",
 812                                 (unsigned long) *ssf );
 813                 }
 814
 815                 if( ssf && *ssf ) {
 816                         if( flags != LDAP_SASL_QUIET ) {
 817                                 fprintf( stderr, "SASL installing layers\n" );
 818                         }
 819                         if ( ld->ld_defconn->lconn_sasl_sockctx ) {
 820                                 oldctx = ld->ld_defconn->lconn_sasl_sockctx;
 821                                 sasl_dispose( &oldctx );
 822                                 ldap_pvt_sasl_remove( ld->ld_sb );
 823                         }
 824                         ldap_pvt_sasl_install( ld->ld_conns->lconn_sb, ctx );
 825                         ld->ld_defconn->lconn_sasl_sockctx = ctx;
 826                 }
 827         }
 828         ld->ld_defconn->lconn_sasl_authctx = ctx;
 829
 830 done:
 831         return rc;
 832 }
 833
 834 int
 835 ldap_int_sasl_external(
 836         LDAP *ld,
 837         LDAPConn *conn,
 838         const char * authid,
 839         ber_len_t ssf )
 840 {
 841         int sc;
 842         sasl_conn_t *ctx;
 843 #if SASL_VERSION_MAJOR < 2
 844         sasl_external_properties_t extprops;
 845 #endif
 846
 847         ctx = conn->lconn_sasl_authctx;
 848
 849         if ( ctx == NULL ) {
 850                 return LDAP_LOCAL_ERROR;
 851         }
 852
 853 #if SASL_VERSION_MAJOR >= 2
 854         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, &ssf );
 855         if ( sc == SASL_OK )
 856                 sc = sasl_setprop( ctx, SASL_AUTH_EXTERNAL, authid );
 857 #else
 858         memset( &extprops, '\0', sizeof(extprops) );
 859         extprops.ssf = ssf;
 860         extprops.auth_id = (char *) authid;
 861
 862         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
 863                 (void *) &extprops );
 864 #endif
 865
 866         if ( sc != SASL_OK ) {
 867                 return LDAP_LOCAL_ERROR;
 868         }
 869
 870         return LDAP_SUCCESS;
 871 }
 872
 873
 874 int ldap_pvt_sasl_secprops(
 875         const char *in,
 876         sasl_security_properties_t *secprops )
 877 {
 878         int i;
 879         char **props = ldap_str2charray( in, "," );
 880         unsigned sflags = 0;
 881         int got_sflags = 0;
 882         sasl_ssf_t max_ssf = 0;
 883         int got_max_ssf = 0;
 884         sasl_ssf_t min_ssf = 0;
 885         int got_min_ssf = 0;
 886         unsigned maxbufsize = 0;
 887         int got_maxbufsize = 0;
 888
 889         if( props == NULL || secprops == NULL ) {
 890                 return LDAP_PARAM_ERROR;
 891         }
 892
 893         for( i=0; props[i]; i++ ) {
 894                 if( !strcasecmp(props[i], "none") ) {
 895                         got_sflags++;
 896
 897                 } else if( !strcasecmp(props[i], "noplain") ) {
 898                         got_sflags++;
 899                         sflags |= SASL_SEC_NOPLAINTEXT;
 900
 901                 } else if( !strcasecmp(props[i], "noactive") ) {
 902                         got_sflags++;
 903                         sflags |= SASL_SEC_NOACTIVE;
 904
 905                 } else if( !strcasecmp(props[i], "nodict") ) {
 906                         got_sflags++;
 907                         sflags |= SASL_SEC_NODICTIONARY;
 908
 909                 } else if( !strcasecmp(props[i], "forwardsec") ) {
 910                         got_sflags++;
 911                         sflags |= SASL_SEC_FORWARD_SECRECY;
 912
 913                 } else if( !strcasecmp(props[i], "noanonymous")) {
 914                         got_sflags++;
 915                         sflags |= SASL_SEC_NOANONYMOUS;
 916
 917                 } else if( !strcasecmp(props[i], "passcred") ) {
 918                         got_sflags++;
 919                         sflags |= SASL_SEC_PASS_CREDENTIALS;
 920
 921                 } else if( !strncasecmp(props[i],
 922                         "minssf=", sizeof("minssf")) )
 923                 {
 924                         if( isdigit( (unsigned char) props[i][sizeof("minssf")] ) ) {
 925                                 got_min_ssf++;
 926                                 min_ssf = atoi( &props[i][sizeof("minssf")] );
 927                         } else {
 928                                 return LDAP_NOT_SUPPORTED;
 929                         }
 930
 931                 } else if( !strncasecmp(props[i],
 932                         "maxssf=", sizeof("maxssf")) )
 933                 {
 934                         if( isdigit( (unsigned char) props[i][sizeof("maxssf")] ) ) {
 935                                 got_max_ssf++;
 936                                 max_ssf = atoi( &props[i][sizeof("maxssf")] );
 937                         } else {
 938                                 return LDAP_NOT_SUPPORTED;
 939                         }
 940
 941                 } else if( !strncasecmp(props[i],
 942                         "maxbufsize=", sizeof("maxbufsize")) )
 943                 {
 944                         if( isdigit( (unsigned char) props[i][sizeof("maxbufsize")] ) ) {
 945                                 got_maxbufsize++;
 946                                 maxbufsize = atoi( &props[i][sizeof("maxbufsize")] );
 947                         } else {
 948                                 return LDAP_NOT_SUPPORTED;
 949                         }
 950
 951                         if( maxbufsize && (( maxbufsize < SASL_MIN_BUFF_SIZE )
 952                                 || (maxbufsize > SASL_MAX_BUFF_SIZE )))
 953                         {
 954                                 /* bad maxbufsize */
 955                                 return LDAP_PARAM_ERROR;
 956                         }
 957
 958                 } else {
 959                         return LDAP_NOT_SUPPORTED;
 960                 }
 961         }
 962
 963         if(got_sflags) {
 964                 secprops->security_flags = sflags;
 965         }
 966         if(got_min_ssf) {
 967                 secprops->min_ssf = min_ssf;
 968         }
 969         if(got_max_ssf) {
 970                 secprops->max_ssf = max_ssf;
 971         }
 972         if(got_maxbufsize) {
 973                 secprops->maxbufsize = maxbufsize;
 974         }
 975
 976         ldap_charray_free( props );
 977         return LDAP_SUCCESS;
 978 }
 979
 980 int
 981 ldap_int_sasl_config( struct ldapoptions *lo, int option, const char *arg )
 982 {
 983         int rc;
 984
 985         switch( option ) {
 986         case LDAP_OPT_X_SASL_SECPROPS:
 987                 rc = ldap_pvt_sasl_secprops( arg, &lo->ldo_sasl_secprops );
 988                 if( rc == LDAP_SUCCESS ) return 0;
 989         }
 990
 991         return -1;
 992 }
 993
 994 int
 995 ldap_int_sasl_get_option( LDAP *ld, int option, void *arg )
 996 {
 997         if ( ld == NULL )
 998                 return -1;
 999
1000         switch ( option ) {
1001                 case LDAP_OPT_X_SASL_MECH: {
1002                         *(char **)arg = ld->ld_options.ldo_def_sasl_mech
1003                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_mech ) : NULL;
1004                 } break;
1005                 case LDAP_OPT_X_SASL_REALM: {
1006                         *(char **)arg = ld->ld_options.ldo_def_sasl_realm
1007                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_realm ) : NULL;
1008                 } break;
1009                 case LDAP_OPT_X_SASL_AUTHCID: {
1010                         *(char **)arg = ld->ld_options.ldo_def_sasl_authcid
1011                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_authcid ) : NULL;
1012                 } break;
1013                 case LDAP_OPT_X_SASL_AUTHZID: {
1014                         *(char **)arg = ld->ld_options.ldo_def_sasl_authzid
1015                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_authzid ) : NULL;
1016                 } break;
1017
1018                 case LDAP_OPT_X_SASL_SSF: {
1019                         int sc;
1020                         sasl_ssf_t      *ssf;
1021                         sasl_conn_t *ctx;
1022
1023                         if( ld->ld_defconn == NULL ) {
1024                                 return -1;
1025                         }
1026
1027                         ctx = ld->ld_defconn->lconn_sasl_sockctx;
1028
1029                         if ( ctx == NULL ) {
1030                                 return -1;
1031                         }
1032
1033                         sc = sasl_getprop( ctx, SASL_SSF,
1034                                 (SASL_CONST void **) &ssf );
1035
1036                         if ( sc != SASL_OK ) {
1037                                 return -1;
1038                         }
1039
1040                         *(ber_len_t *)arg = *ssf;
1041                 } break;
1042
1043                 case LDAP_OPT_X_SASL_SSF_EXTERNAL:
1044                         /* this option is write only */
1045                         return -1;
1046
1047                 case LDAP_OPT_X_SASL_SSF_MIN:
1048                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.min_ssf;
1049                         break;
1050                 case LDAP_OPT_X_SASL_SSF_MAX:
1051                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.max_ssf;
1052                         break;
1053                 case LDAP_OPT_X_SASL_MAXBUFSIZE:
1054                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.maxbufsize;
1055                         break;
1056
1057                 case LDAP_OPT_X_SASL_SECPROPS:
1058                         /* this option is write only */
1059                         return -1;
1060
1061                 default:
1062                         return -1;
1063         }
1064         return 0;
1065 }
1066
1067 int
1068 ldap_int_sasl_set_option( LDAP *ld, int option, void *arg )
1069 {
1070         if ( ld == NULL )
1071                 return -1;
1072
1073         switch ( option ) {
1074         case LDAP_OPT_X_SASL_SSF:
1075                 /* This option is read-only */
1076                 return -1;
1077
1078         case LDAP_OPT_X_SASL_SSF_EXTERNAL: {
1079                 int sc;
1080 #if SASL_VERSION_MAJOR < 2
1081                 sasl_external_properties_t extprops;
1082 #endif
1083                 sasl_conn_t *ctx;
1084
1085                 if( ld->ld_defconn == NULL ) {
1086                         return -1;
1087                 }
1088
1089                 ctx = ld->ld_defconn->lconn_sasl_authctx;
1090
1091                 if ( ctx == NULL ) {
1092                         return -1;
1093                 }
1094
1095 #if SASL_VERSION_MAJOR >= 2
1096                 sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, arg);
1097 #else
1098                 memset(&extprops, 0L, sizeof(extprops));
1099
1100                 extprops.ssf = * (ber_len_t *) arg;
1101
1102                 sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
1103                         (void *) &extprops );
1104 #endif
1105
1106                 if ( sc != SASL_OK ) {
1107                         return -1;
1108                 }
1109                 } break;
1110
1111         case LDAP_OPT_X_SASL_SSF_MIN:
1112                 ld->ld_options.ldo_sasl_secprops.min_ssf = *(ber_len_t *)arg;
1113                 break;
1114         case LDAP_OPT_X_SASL_SSF_MAX:
1115                 ld->ld_options.ldo_sasl_secprops.max_ssf = *(ber_len_t *)arg;
1116                 break;
1117         case LDAP_OPT_X_SASL_MAXBUFSIZE:
1118                 ld->ld_options.ldo_sasl_secprops.maxbufsize = *(ber_len_t *)arg;
1119                 break;
1120
1121         case LDAP_OPT_X_SASL_SECPROPS: {
1122                 int sc;
1123                 sc = ldap_pvt_sasl_secprops( (char *) arg,
1124                         &ld->ld_options.ldo_sasl_secprops );
1125
1126                 return sc == LDAP_SUCCESS ? 0 : -1;
1127                 }
1128
1129         default:
1130                 return -1;
1131         }
1132         return 0;
1133 }
1134
1135 #ifdef LDAP_R_COMPILE
1136 #define LDAP_DEBUG_R_SASL
1137 void *ldap_pvt_sasl_mutex_new(void)
1138 {
1139         ldap_pvt_thread_mutex_t *mutex;
1140
1141         mutex = (ldap_pvt_thread_mutex_t *) LDAP_MALLOC(
1142                 sizeof(ldap_pvt_thread_mutex_t) );
1143
1144         if ( ldap_pvt_thread_mutex_init( mutex ) == 0 ) {
1145                 return mutex;
1146         }
1147 #ifndef LDAP_DEBUG_R_SASL
1148         assert( 0 );
1149 #endif /* !LDAP_DEBUG_R_SASL */
1150         return NULL;
1151 }
1152
1153 int ldap_pvt_sasl_mutex_lock(void *mutex)
1154 {
1155 #ifdef LDAP_DEBUG_R_SASL
1156         if ( mutex == NULL ) {
1157                 return SASL_OK;
1158         }
1159 #else /* !LDAP_DEBUG_R_SASL */
1160         assert( mutex );
1161 #endif /* !LDAP_DEBUG_R_SASL */
1162         return ldap_pvt_thread_mutex_lock( (ldap_pvt_thread_mutex_t *)mutex )
1163                 ? SASL_FAIL : SASL_OK;
1164 }
1165
1166 int ldap_pvt_sasl_mutex_unlock(void *mutex)
1167 {
1168 #ifdef LDAP_DEBUG_R_SASL
1169         if ( mutex == NULL ) {
1170                 return SASL_OK;
1171         }
1172 #else /* !LDAP_DEBUG_R_SASL */
1173         assert( mutex );
1174 #endif /* !LDAP_DEBUG_R_SASL */
1175         return ldap_pvt_thread_mutex_unlock( (ldap_pvt_thread_mutex_t *)mutex )
1176                 ? SASL_FAIL : SASL_OK;
1177 }
1178
1179 void ldap_pvt_sasl_mutex_dispose(void *mutex)
1180 {
1181 #ifdef LDAP_DEBUG_R_SASL
1182         if ( mutex == NULL ) {
1183                 return;
1184         }
1185 #else /* !LDAP_DEBUG_R_SASL */
1186         assert( mutex );
1187 #endif /* !LDAP_DEBUG_R_SASL */
1188         (void) ldap_pvt_thread_mutex_destroy( (ldap_pvt_thread_mutex_t *)mutex );
1189         LDAP_FREE( mutex );
1190 }
1191 #endif
1192
1193 #else
1194 int ldap_int_sasl_init( void )
1195 { return LDAP_SUCCESS; }
1196
1197 int ldap_int_sasl_close( LDAP *ld, LDAPConn *lc )
1198 { return LDAP_SUCCESS; }
1199
1200 int
1201 ldap_int_sasl_bind(
1202         LDAP                    *ld,
1203         const char              *dn,
1204         const char              *mechs,
1205         LDAPControl             **sctrls,
1206         LDAPControl             **cctrls,
1207         unsigned                flags,
1208         LDAP_SASL_INTERACT_PROC *interact,
1209         void * defaults )
1210 { return LDAP_NOT_SUPPORTED; }
1211
1212 int
1213 ldap_int_sasl_external(
1214         LDAP *ld,
1215         LDAPConn *conn,
1216         const char * authid,
1217         ber_len_t ssf )
1218 { return LDAP_SUCCESS; }
1219
1220 #endif /* HAVE_CYRUS_SASL */