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 #endif
 118
 119         if ( sasl_client_init( NULL ) == SASL_OK ) {
 120                 sasl_initialized = 1;
 121                 return 0;
 122         }
 123
 124 #if SASL_VERSION_MAJOR < 2
 125         /* A no-op to make sure we link with Cyrus 1.5 */
 126         sasl_client_auth( NULL, NULL, NULL, 0, NULL, NULL );
 127 #endif
 128         return -1;
 129 }
 130
 131 /*
 132  * SASL encryption support for LBER Sockbufs
 133  */
 134
 135 struct sb_sasl_data {
 136         sasl_conn_t             *sasl_context;
 137         unsigned                *sasl_maxbuf;
 138         Sockbuf_Buf             sec_buf_in;
 139         Sockbuf_Buf             buf_in;
 140         Sockbuf_Buf             buf_out;
 141 };
 142
 143 static int
 144 sb_sasl_setup( Sockbuf_IO_Desc *sbiod, void *arg )
 145 {
 146         struct sb_sasl_data     *p;
 147
 148         assert( sbiod != NULL );
 149
 150         p = LBER_MALLOC( sizeof( *p ) );
 151         if ( p == NULL )
 152                 return -1;
 153         p->sasl_context = (sasl_conn_t *)arg;
 154         ber_pvt_sb_buf_init( &p->sec_buf_in );
 155         ber_pvt_sb_buf_init( &p->buf_in );
 156         ber_pvt_sb_buf_init( &p->buf_out );
 157         if ( ber_pvt_sb_grow_buffer( &p->sec_buf_in, SASL_MIN_BUFF_SIZE ) < 0 ) {
 158                 LBER_FREE( p );
 159                 errno = ENOMEM;
 160                 return -1;
 161         }
 162         sasl_getprop( p->sasl_context, SASL_MAXOUTBUF,
 163                 (SASL_CONST void **) &p->sasl_maxbuf );
 164
 165         sbiod->sbiod_pvt = p;
 166
 167         return 0;
 168 }
 169
 170 static int
 171 sb_sasl_remove( Sockbuf_IO_Desc *sbiod )
 172 {
 173         struct sb_sasl_data     *p;
 174
 175         assert( sbiod != NULL );
 176
 177         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 178 #if SASL_VERSION_MAJOR >= 2
 179         /*
 180          * SASLv2 encode/decode buffers are managed by
 181          * libsasl2. Ensure they are not freed by liblber.
 182          */
 183         p->buf_in.buf_base = NULL;
 184         p->buf_out.buf_base = NULL;
 185 #endif
 186         ber_pvt_sb_buf_destroy( &p->sec_buf_in );
 187         ber_pvt_sb_buf_destroy( &p->buf_in );
 188         ber_pvt_sb_buf_destroy( &p->buf_out );
 189         LBER_FREE( p );
 190         sbiod->sbiod_pvt = NULL;
 191         return 0;
 192 }
 193
 194 static ber_len_t
 195 sb_sasl_pkt_length( const unsigned char *buf, int debuglevel )
 196 {
 197         ber_len_t               size;
 198
 199         assert( buf != NULL );
 200
 201         size = buf[0] << 24
 202                 | buf[1] << 16
 203                 | buf[2] << 8
 204                 | buf[3];
 205
 206         if ( size > SASL_MAX_BUFF_SIZE ) {
 207                 /* somebody is trying to mess me up. */
 208                 ber_log_printf( LDAP_DEBUG_ANY, debuglevel,
 209                         "sb_sasl_pkt_length: received illegal packet length "
 210                         "of %lu bytes\n", (unsigned long)size );
 211                 size = 16; /* this should lead to an error. */
 212         }
 213
 214         return size + 4; /* include the size !!! */
 215 }
 216
 217 /* Drop a processed packet from the input buffer */
 218 static void
 219 sb_sasl_drop_packet ( Sockbuf_Buf *sec_buf_in, int debuglevel )
 220 {
 221         ber_slen_t                      len;
 222
 223         len = sec_buf_in->buf_ptr - sec_buf_in->buf_end;
 224         if ( len > 0 )
 225                 AC_MEMCPY( sec_buf_in->buf_base, sec_buf_in->buf_base +
 226                         sec_buf_in->buf_end, len );
 227
 228         if ( len >= 4 ) {
 229                 sec_buf_in->buf_end = sb_sasl_pkt_length(
 230                         (unsigned char *) sec_buf_in->buf_base, debuglevel);
 231         }
 232         else {
 233                 sec_buf_in->buf_end = 0;
 234         }
 235         sec_buf_in->buf_ptr = len;
 236 }
 237
 238 static ber_slen_t
 239 sb_sasl_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
 240 {
 241         struct sb_sasl_data     *p;
 242         ber_slen_t              ret, bufptr;
 243
 244         assert( sbiod != NULL );
 245         assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
 246
 247         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 248
 249         /* Are there anything left in the buffer? */
 250         ret = ber_pvt_sb_copy_out( &p->buf_in, buf, len );
 251         bufptr = ret;
 252         len -= ret;
 253
 254         if ( len == 0 )
 255                 return bufptr;
 256
 257 #if SASL_VERSION_MAJOR >= 2
 258         ber_pvt_sb_buf_init( &p->buf_in );
 259 #else
 260         ber_pvt_sb_buf_destroy( &p->buf_in );
 261 #endif
 262
 263         /* Read the length of the packet */
 264         while ( p->sec_buf_in.buf_ptr < 4 ) {
 265                 ret = LBER_SBIOD_READ_NEXT( sbiod, p->sec_buf_in.buf_base +
 266                         p->sec_buf_in.buf_ptr,
 267                         4 - p->sec_buf_in.buf_ptr );
 268 #ifdef EINTR
 269                 if ( ( ret < 0 ) && ( errno == EINTR ) )
 270                         continue;
 271 #endif
 272                 if ( ret <= 0 )
 273                         return bufptr ? bufptr : ret;
 274
 275                 p->sec_buf_in.buf_ptr += ret;
 276         }
 277
 278         /* The new packet always starts at p->sec_buf_in.buf_base */
 279         ret = sb_sasl_pkt_length( (unsigned char *) p->sec_buf_in.buf_base,
 280                 sbiod->sbiod_sb->sb_debug );
 281
 282         /* Grow the packet buffer if neccessary */
 283         if ( ( p->sec_buf_in.buf_size < (ber_len_t) ret ) &&
 284                 ber_pvt_sb_grow_buffer( &p->sec_buf_in, ret ) < 0 )
 285         {
 286                 errno = ENOMEM;
 287                 return -1;
 288         }
 289         p->sec_buf_in.buf_end = ret;
 290
 291         /* Did we read the whole encrypted packet? */
 292         while ( p->sec_buf_in.buf_ptr < p->sec_buf_in.buf_end ) {
 293                 /* No, we have got only a part of it */
 294                 ret = p->sec_buf_in.buf_end - p->sec_buf_in.buf_ptr;
 295
 296                 ret = LBER_SBIOD_READ_NEXT( sbiod, p->sec_buf_in.buf_base +
 297                         p->sec_buf_in.buf_ptr, ret );
 298 #ifdef EINTR
 299                 if ( ( ret < 0 ) && ( errno == EINTR ) )
 300                         continue;
 301 #endif
 302                 if ( ret <= 0 )
 303                         return bufptr ? bufptr : ret;
 304
 305                 p->sec_buf_in.buf_ptr += ret;
 306         }
 307
 308         /* Decode the packet */
 309         {
 310                 unsigned tmpsize = p->buf_in.buf_end;
 311                 ret = sasl_decode( p->sasl_context, p->sec_buf_in.buf_base,
 312                         p->sec_buf_in.buf_end,
 313                         (SASL_CONST char **)&p->buf_in.buf_base,
 314                         (unsigned *)&tmpsize );
 315                 p->buf_in.buf_end = tmpsize;
 316         }
 317
 318         /* Drop the packet from the input buffer */
 319         sb_sasl_drop_packet( &p->sec_buf_in, sbiod->sbiod_sb->sb_debug );
 320
 321         if ( ret != SASL_OK ) {
 322                 ber_log_printf( LDAP_DEBUG_ANY, sbiod->sbiod_sb->sb_debug,
 323                         "sb_sasl_read: failed to decode packet: %s\n",
 324                         sasl_errstring( ret, NULL, NULL ) );
 325                 errno = EIO;
 326                 return -1;
 327         }
 328
 329         p->buf_in.buf_size = p->buf_in.buf_end;
 330
 331         bufptr += ber_pvt_sb_copy_out( &p->buf_in, (char*) buf + bufptr, len );
 332
 333         return bufptr;
 334 }
 335
 336 static ber_slen_t
 337 sb_sasl_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
 338 {
 339         struct sb_sasl_data     *p;
 340         int                     ret;
 341
 342         assert( sbiod != NULL );
 343         assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
 344
 345         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 346
 347         /* Are there anything left in the buffer? */
 348         if ( p->buf_out.buf_ptr != p->buf_out.buf_end ) {
 349                 ret = ber_pvt_sb_do_write( sbiod, &p->buf_out );
 350                 if ( ret < 0 ) return ret;
 351
 352                 /* Still have something left?? */
 353                 if ( p->buf_out.buf_ptr != p->buf_out.buf_end ) {
 354                         errno = EAGAIN;
 355                         return 0;
 356                 }
 357         }
 358
 359         /* now encode the next packet. */
 360 #if SASL_VERSION_MAJOR >= 2
 361         ber_pvt_sb_buf_init( &p->buf_out );
 362 #else
 363         ber_pvt_sb_buf_destroy( &p->buf_out );
 364 #endif
 365         if ( len > *p->sasl_maxbuf - 100 ) {
 366                 len = *p->sasl_maxbuf - 100;    /* For safety margin */
 367         }
 368
 369         {
 370                 unsigned tmpsize = p->buf_out.buf_size;
 371                 ret = sasl_encode( p->sasl_context, buf, len,
 372                         (SASL_CONST char **)&p->buf_out.buf_base,
 373                         &tmpsize );
 374                 p->buf_out.buf_size = tmpsize;
 375         }
 376
 377         if ( ret != SASL_OK ) {
 378                 ber_log_printf( LDAP_DEBUG_ANY, sbiod->sbiod_sb->sb_debug,
 379                         "sb_sasl_write: failed to encode packet: %s\n",
 380                         sasl_errstring( ret, NULL, NULL ) );
 381                 errno = EIO;
 382                 return -1;
 383         }
 384         p->buf_out.buf_end = p->buf_out.buf_size;
 385
 386         ret = ber_pvt_sb_do_write( sbiod, &p->buf_out );
 387 #if 0 /* retry => re-sasl_encode, that would be bad */
 388         if ( ret <= 0 ) {
 389                 return ret;
 390         }
 391 #endif
 392         return len;
 393 }
 394
 395 static int
 396 sb_sasl_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
 397 {
 398         struct sb_sasl_data     *p;
 399
 400         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 401
 402         if ( opt == LBER_SB_OPT_DATA_READY ) {
 403                 if ( p->buf_in.buf_ptr != p->buf_in.buf_end ) return 1;
 404         }
 405
 406         return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
 407 }
 408
 409 Sockbuf_IO ldap_pvt_sockbuf_io_sasl = {
 410         sb_sasl_setup,          /* sbi_setup */
 411         sb_sasl_remove,         /* sbi_remove */
 412         sb_sasl_ctrl,           /* sbi_ctrl */
 413         sb_sasl_read,           /* sbi_read */
 414         sb_sasl_write,          /* sbi_write */
 415         NULL                    /* sbi_close */
 416 };
 417
 418 int ldap_pvt_sasl_install( Sockbuf *sb, void *ctx_arg )
 419 {
 420 #ifdef NEW_LOGGING
 421         LDAP_LOG ( TRANSPORT, ENTRY, "ldap_pvt_sasl_install\n", 0, 0, 0 );
 422 #else
 423         Debug( LDAP_DEBUG_TRACE, "ldap_pvt_sasl_install\n",
 424                 0, 0, 0 );
 425 #endif
 426
 427         /* don't install the stuff unless security has been negotiated */
 428
 429         if ( !ber_sockbuf_ctrl( sb, LBER_SB_OPT_HAS_IO,
 430                         &ldap_pvt_sockbuf_io_sasl ) )
 431         {
 432 #ifdef LDAP_DEBUG
 433                 ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
 434                         LBER_SBIOD_LEVEL_APPLICATION, (void *)"sasl_" );
 435 #endif
 436                 ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_sasl,
 437                         LBER_SBIOD_LEVEL_APPLICATION, ctx_arg );
 438         }
 439
 440         return LDAP_SUCCESS;
 441 }
 442
 443 void ldap_pvt_sasl_remove( Sockbuf *sb )
 444 {
 445         ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_sasl,
 446                 LBER_SBIOD_LEVEL_APPLICATION );
 447 #ifdef LDAP_DEBUG
 448         ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
 449                 LBER_SBIOD_LEVEL_APPLICATION );
 450 #endif
 451 }
 452
 453 static int
 454 sasl_err2ldap( int saslerr )
 455 {
 456         int rc;
 457
 458         switch (saslerr) {
 459                 case SASL_CONTINUE:
 460                         rc = LDAP_MORE_RESULTS_TO_RETURN;
 461                         break;
 462                 case SASL_INTERACT:
 463                         rc = LDAP_LOCAL_ERROR;
 464                         break;
 465                 case SASL_OK:
 466                         rc = LDAP_SUCCESS;
 467                         break;
 468                 case SASL_FAIL:
 469                         rc = LDAP_LOCAL_ERROR;
 470                         break;
 471                 case SASL_NOMEM:
 472                         rc = LDAP_NO_MEMORY;
 473                         break;
 474                 case SASL_NOMECH:
 475                         rc = LDAP_AUTH_UNKNOWN;
 476                         break;
 477                 case SASL_BADAUTH:
 478                         rc = LDAP_AUTH_UNKNOWN;
 479                         break;
 480                 case SASL_NOAUTHZ:
 481                         rc = LDAP_PARAM_ERROR;
 482                         break;
 483                 case SASL_TOOWEAK:
 484                 case SASL_ENCRYPT:
 485                         rc = LDAP_AUTH_UNKNOWN;
 486                         break;
 487                 default:
 488                         rc = LDAP_LOCAL_ERROR;
 489                         break;
 490         }
 491
 492         assert( rc == LDAP_SUCCESS || LDAP_API_ERROR( rc ) );
 493         return rc;
 494 }
 495
 496 int
 497 ldap_int_sasl_open(
 498         LDAP *ld,
 499         LDAPConn *lc,
 500         const char * host )
 501 {
 502         int rc;
 503         sasl_conn_t *ctx;
 504
 505         assert( lc->lconn_sasl_authctx == NULL );
 506
 507         if ( host == NULL ) {
 508                 ld->ld_errno = LDAP_LOCAL_ERROR;
 509                 return ld->ld_errno;
 510         }
 511
 512         if ( ldap_int_sasl_init() ) {
 513                 ld->ld_errno = LDAP_LOCAL_ERROR;
 514                 return ld->ld_errno;
 515         }
 516
 517 #if SASL_VERSION_MAJOR >= 2
 518         rc = sasl_client_new( "ldap", host, NULL, NULL,
 519                 client_callbacks, 0, &ctx );
 520 #else
 521         rc = sasl_client_new( "ldap", host, client_callbacks,
 522                 SASL_SECURITY_LAYER, &ctx );
 523 #endif
 524
 525         if ( rc != SASL_OK ) {
 526                 ld->ld_errno = sasl_err2ldap( rc );
 527                 return ld->ld_errno;
 528         }
 529
 530 #ifdef NEW_LOGGING
 531         LDAP_LOG ( TRANSPORT, DETAIL1, "ldap_int_sasl_open: host=%s\n",
 532                 host, 0, 0 );
 533 #else
 534         Debug( LDAP_DEBUG_TRACE, "ldap_int_sasl_open: host=%s\n",
 535                 host, 0, 0 );
 536 #endif
 537
 538         lc->lconn_sasl_authctx = ctx;
 539
 540         return LDAP_SUCCESS;
 541 }
 542
 543 int ldap_int_sasl_close( LDAP *ld, LDAPConn *lc )
 544 {
 545         sasl_conn_t *ctx = lc->lconn_sasl_authctx;
 546
 547         if( ctx != NULL ) {
 548                 sasl_dispose( &ctx );
 549                 if ( lc->lconn_sasl_sockctx &&
 550                         lc->lconn_sasl_authctx != lc->lconn_sasl_sockctx ) {
 551                         ctx = lc->lconn_sasl_sockctx;
 552                         sasl_dispose( &ctx );
 553                 }
 554                 lc->lconn_sasl_sockctx = NULL;
 555                 lc->lconn_sasl_authctx = NULL;
 556         }
 557
 558         return LDAP_SUCCESS;
 559 }
 560
 561 int
 562 ldap_int_sasl_bind(
 563         LDAP                    *ld,
 564         const char              *dn,
 565         const char              *mechs,
 566         LDAPControl             **sctrls,
 567         LDAPControl             **cctrls,
 568         unsigned                flags,
 569         LDAP_SASL_INTERACT_PROC *interact,
 570         void * defaults )
 571 {
 572         char *data;
 573         const char *mech = NULL;
 574         const char *pmech = NULL;
 575         int                     saslrc, rc;
 576         sasl_ssf_t              *ssf = NULL;
 577         sasl_conn_t     *ctx, *oldctx = NULL;
 578         sasl_interact_t *prompts = NULL;
 579         unsigned credlen;
 580         struct berval ccred;
 581         ber_socket_t            sd;
 582         void    *ssl;
 583
 584 #ifdef NEW_LOGGING
 585         LDAP_LOG ( TRANSPORT, ARGS, "ldap_int_sasl_bind: %s\n",
 586                 mechs ? mechs : "<null>", 0, 0 );
 587 #else
 588         Debug( LDAP_DEBUG_TRACE, "ldap_int_sasl_bind: %s\n",
 589                 mechs ? mechs : "<null>", 0, 0 );
 590 #endif
 591
 592         /* do a quick !LDAPv3 check... ldap_sasl_bind will do the rest. */
 593         if (ld->ld_version < LDAP_VERSION3) {
 594                 ld->ld_errno = LDAP_NOT_SUPPORTED;
 595                 return ld->ld_errno;
 596         }
 597
 598         ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, &sd );
 599
 600         if ( sd == AC_SOCKET_INVALID ) {
 601                 /* not connected yet */
 602                 int rc;
 603
 604                 rc = ldap_open_defconn( ld );
 605                 if( rc < 0 ) return ld->ld_errno;
 606
 607                 ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, &sd );
 608
 609                 if( sd == AC_SOCKET_INVALID ) {
 610                         ld->ld_errno = LDAP_LOCAL_ERROR;
 611                         return ld->ld_errno;
 612                 }
 613         }
 614
 615         oldctx = ld->ld_defconn->lconn_sasl_authctx;
 616
 617         /* If we already have an authentication context, clear it out */
 618         if( oldctx ) {
 619                 if ( oldctx != ld->ld_defconn->lconn_sasl_sockctx ) {
 620                         sasl_dispose( &oldctx );
 621                 }
 622                 ld->ld_defconn->lconn_sasl_authctx = NULL;
 623         }
 624
 625         { char *saslhost = ldap_host_connected_to( ld->ld_sb, "localhost" );
 626         rc = ldap_int_sasl_open( ld, ld->ld_defconn, saslhost );
 627         LDAP_FREE( saslhost );
 628         }
 629
 630         if ( rc != LDAP_SUCCESS ) return rc;
 631
 632         ctx = ld->ld_defconn->lconn_sasl_authctx;
 633
 634         /* Check for TLS */
 635         ssl = ldap_pvt_tls_sb_ctx( ld->ld_sb );
 636         if ( ssl ) {
 637                 struct berval authid = BER_BVNULL;
 638                 ber_len_t fac;
 639
 640                 fac = ldap_pvt_tls_get_strength( ssl );
 641                 /* failure is OK, we just can't use SASL EXTERNAL */
 642                 (void) ldap_pvt_tls_get_my_dn( ssl, &authid, NULL, 0 );
 643
 644                 (void) ldap_int_sasl_external( ld, ld->ld_defconn, authid.bv_val, fac );
 645                 LDAP_FREE( authid.bv_val );
 646         }
 647
 648 #if !defined(_WIN32)
 649         /* Check for local */
 650         if ( ldap_pvt_url_scheme2proto( ld->ld_defconn->lconn_server->lud_scheme ) == LDAP_PROTO_IPC ) {
 651                 char authid[sizeof("uidNumber=4294967295+gidNumber=4294967295,"
 652                         "cn=peercred,cn=external,cn=auth")];
 653                 sprintf( authid, "uidNumber=%d+gidNumber=%d,"
 654                         "cn=peercred,cn=external,cn=auth",
 655                         (int) geteuid(), (int) getegid() );
 656                 (void) ldap_int_sasl_external( ld, ld->ld_defconn, authid, LDAP_PVT_SASL_LOCAL_SSF );
 657         }
 658 #endif
 659
 660         /* (re)set security properties */
 661         sasl_setprop( ctx, SASL_SEC_PROPS,
 662                 &ld->ld_options.ldo_sasl_secprops );
 663
 664         ccred.bv_val = NULL;
 665         ccred.bv_len = 0;
 666
 667         do {
 668                 saslrc = sasl_client_start( ctx,
 669                         mechs,
 670 #if SASL_VERSION_MAJOR < 2
 671                         NULL,
 672 #endif
 673                         &prompts,
 674                         (SASL_CONST char **)&ccred.bv_val,
 675                         &credlen,
 676                         &mech );
 677
 678                 if( pmech == NULL && mech != NULL ) {
 679                         pmech = mech;
 680
 681                         if( flags != LDAP_SASL_QUIET ) {
 682                                 fprintf(stderr,
 683                                         "SASL/%s authentication started\n",
 684                                         pmech );
 685                         }
 686                 }
 687
 688                 if( saslrc == SASL_INTERACT ) {
 689                         int res;
 690                         if( !interact ) break;
 691                         res = (interact)( ld, flags, defaults, prompts );
 692
 693                         if( res != LDAP_SUCCESS ) break;
 694                 }
 695         } while ( saslrc == SASL_INTERACT );
 696
 697         ccred.bv_len = credlen;
 698
 699         if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 700                 rc = ld->ld_errno = sasl_err2ldap( saslrc );
 701 #if SASL_VERSION_MAJOR >= 2
 702                 ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 703 #endif
 704                 goto done;
 705         }
 706
 707         do {
 708                 struct berval *scred;
 709                 unsigned credlen;
 710
 711                 scred = NULL;
 712
 713                 rc = ldap_sasl_bind_s( ld, dn, mech, &ccred, sctrls, cctrls, &scred );
 714
 715                 if ( ccred.bv_val != NULL ) {
 716 #if SASL_VERSION_MAJOR < 2
 717                         LDAP_FREE( ccred.bv_val );
 718 #endif
 719                         ccred.bv_val = NULL;
 720                 }
 721
 722                 if ( rc != LDAP_SUCCESS && rc != LDAP_SASL_BIND_IN_PROGRESS ) {
 723                         if( scred && scred->bv_len ) {
 724                                 /* and server provided us with data? */
 725 #ifdef NEW_LOGGING
 726                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 727                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 728                                         rc, saslrc, scred->bv_len );
 729 #else
 730                                 Debug( LDAP_DEBUG_TRACE,
 731                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 732                                         rc, saslrc, scred->bv_len );
 733 #endif
 734                                 ber_bvfree( scred );
 735                         }
 736                         rc = ld->ld_errno;
 737                         goto done;
 738                 }
 739
 740                 if( rc == LDAP_SUCCESS && saslrc == SASL_OK ) {
 741                         /* we're done, no need to step */
 742                         if( scred && scred->bv_len ) {
 743                                 /* but server provided us with data! */
 744 #ifdef NEW_LOGGING
 745                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 746                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 747                                         rc, saslrc, scred->bv_len );
 748 #else
 749                                 Debug( LDAP_DEBUG_TRACE,
 750                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 751                                         rc, saslrc, scred->bv_len );
 752 #endif
 753                                 ber_bvfree( scred );
 754                                 rc = ld->ld_errno = LDAP_LOCAL_ERROR;
 755                                 goto done;
 756                         }
 757                         break;
 758                 }
 759
 760                 do {
 761                         saslrc = sasl_client_step( ctx,
 762                                 (scred == NULL) ? NULL : scred->bv_val,
 763                                 (scred == NULL) ? 0 : scred->bv_len,
 764                                 &prompts,
 765                                 (SASL_CONST char **)&ccred.bv_val,
 766                                 &credlen );
 767
 768 #ifdef NEW_LOGGING
 769                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 770                                         "ldap_int_sasl_bind: sasl_client_step: %d\n", saslrc,0,0 );
 771 #else
 772                         Debug( LDAP_DEBUG_TRACE, "sasl_client_step: %d\n",
 773                                 saslrc, 0, 0 );
 774 #endif
 775
 776                         if( saslrc == SASL_INTERACT ) {
 777                                 int res;
 778                                 if( !interact ) break;
 779                                 res = (interact)( ld, flags, defaults, prompts );
 780                                 if( res != LDAP_SUCCESS ) break;
 781                         }
 782                 } while ( saslrc == SASL_INTERACT );
 783
 784                 ccred.bv_len = credlen;
 785                 ber_bvfree( scred );
 786
 787                 if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 788                         ld->ld_errno = sasl_err2ldap( saslrc );
 789 #if SASL_VERSION_MAJOR >= 2
 790                         ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 791 #endif
 792                         rc = ld->ld_errno;
 793                         goto done;
 794                 }
 795         } while ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 796
 797         if ( rc != LDAP_SUCCESS ) goto done;
 798
 799         if ( saslrc != SASL_OK ) {
 800 #if SASL_VERSION_MAJOR >= 2
 801                 ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 802 #endif
 803                 rc = ld->ld_errno = sasl_err2ldap( saslrc );
 804                 goto done;
 805         }
 806
 807         if( flags != LDAP_SASL_QUIET ) {
 808                 saslrc = sasl_getprop( ctx, SASL_USERNAME, (SASL_CONST void **) &data );
 809                 if( saslrc == SASL_OK && data && *data ) {
 810                         fprintf( stderr, "SASL username: %s\n", data );
 811                 }
 812
 813 #if SASL_VERSION_MAJOR < 2
 814                 saslrc = sasl_getprop( ctx, SASL_REALM, (SASL_CONST void **) &data );
 815                 if( saslrc == SASL_OK && data && *data ) {
 816                         fprintf( stderr, "SASL realm: %s\n", data );
 817                 }
 818 #endif
 819         }
 820
 821         saslrc = sasl_getprop( ctx, SASL_SSF, (SASL_CONST void **) &ssf );
 822         if( saslrc == SASL_OK ) {
 823                 if( flags != LDAP_SASL_QUIET ) {
 824                         fprintf( stderr, "SASL SSF: %lu\n",
 825                                 (unsigned long) *ssf );
 826                 }
 827
 828                 if( ssf && *ssf ) {
 829                         if( flags != LDAP_SASL_QUIET ) {
 830                                 fprintf( stderr, "SASL installing layers\n" );
 831                         }
 832                         if ( ld->ld_defconn->lconn_sasl_sockctx ) {
 833                                 oldctx = ld->ld_defconn->lconn_sasl_sockctx;
 834                                 sasl_dispose( &oldctx );
 835                                 ldap_pvt_sasl_remove( ld->ld_sb );
 836                         }
 837                         ldap_pvt_sasl_install( ld->ld_conns->lconn_sb, ctx );
 838                         ld->ld_defconn->lconn_sasl_sockctx = ctx;
 839                 }
 840         }
 841         ld->ld_defconn->lconn_sasl_authctx = ctx;
 842
 843 done:
 844         return rc;
 845 }
 846
 847 int
 848 ldap_int_sasl_external(
 849         LDAP *ld,
 850         LDAPConn *conn,
 851         const char * authid,
 852         ber_len_t ssf )
 853 {
 854         int sc;
 855         sasl_conn_t *ctx;
 856 #if SASL_VERSION_MAJOR < 2
 857         sasl_external_properties_t extprops;
 858 #endif
 859
 860         ctx = conn->lconn_sasl_authctx;
 861
 862         if ( ctx == NULL ) {
 863                 return LDAP_LOCAL_ERROR;
 864         }
 865
 866 #if SASL_VERSION_MAJOR >= 2
 867         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, &ssf );
 868         if ( sc == SASL_OK )
 869                 sc = sasl_setprop( ctx, SASL_AUTH_EXTERNAL, authid );
 870 #else
 871         memset( &extprops, '\0', sizeof(extprops) );
 872         extprops.ssf = ssf;
 873         extprops.auth_id = (char *) authid;
 874
 875         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
 876                 (void *) &extprops );
 877 #endif
 878
 879         if ( sc != SASL_OK ) {
 880                 return LDAP_LOCAL_ERROR;
 881         }
 882
 883         return LDAP_SUCCESS;
 884 }
 885
 886
 887 int ldap_pvt_sasl_secprops(
 888         const char *in,
 889         sasl_security_properties_t *secprops )
 890 {
 891         int i;
 892         char **props = ldap_str2charray( in, "," );
 893         unsigned sflags = 0;
 894         int got_sflags = 0;
 895         sasl_ssf_t max_ssf = 0;
 896         int got_max_ssf = 0;
 897         sasl_ssf_t min_ssf = 0;
 898         int got_min_ssf = 0;
 899         unsigned maxbufsize = 0;
 900         int got_maxbufsize = 0;
 901
 902         if( props == NULL || secprops == NULL ) {
 903                 return LDAP_PARAM_ERROR;
 904         }
 905
 906         for( i=0; props[i]; i++ ) {
 907                 if( !strcasecmp(props[i], "none") ) {
 908                         got_sflags++;
 909
 910                 } else if( !strcasecmp(props[i], "noplain") ) {
 911                         got_sflags++;
 912                         sflags |= SASL_SEC_NOPLAINTEXT;
 913
 914                 } else if( !strcasecmp(props[i], "noactive") ) {
 915                         got_sflags++;
 916                         sflags |= SASL_SEC_NOACTIVE;
 917
 918                 } else if( !strcasecmp(props[i], "nodict") ) {
 919                         got_sflags++;
 920                         sflags |= SASL_SEC_NODICTIONARY;
 921
 922                 } else if( !strcasecmp(props[i], "forwardsec") ) {
 923                         got_sflags++;
 924                         sflags |= SASL_SEC_FORWARD_SECRECY;
 925
 926                 } else if( !strcasecmp(props[i], "noanonymous")) {
 927                         got_sflags++;
 928                         sflags |= SASL_SEC_NOANONYMOUS;
 929
 930                 } else if( !strcasecmp(props[i], "passcred") ) {
 931                         got_sflags++;
 932                         sflags |= SASL_SEC_PASS_CREDENTIALS;
 933
 934                 } else if( !strncasecmp(props[i],
 935                         "minssf=", sizeof("minssf")) )
 936                 {
 937                         if( isdigit( (unsigned char) props[i][sizeof("minssf")] ) ) {
 938                                 got_min_ssf++;
 939                                 min_ssf = atoi( &props[i][sizeof("minssf")] );
 940                         } else {
 941                                 return LDAP_NOT_SUPPORTED;
 942                         }
 943
 944                 } else if( !strncasecmp(props[i],
 945                         "maxssf=", sizeof("maxssf")) )
 946                 {
 947                         if( isdigit( (unsigned char) props[i][sizeof("maxssf")] ) ) {
 948                                 got_max_ssf++;
 949                                 max_ssf = atoi( &props[i][sizeof("maxssf")] );
 950                         } else {
 951                                 return LDAP_NOT_SUPPORTED;
 952                         }
 953
 954                 } else if( !strncasecmp(props[i],
 955                         "maxbufsize=", sizeof("maxbufsize")) )
 956                 {
 957                         if( isdigit( (unsigned char) props[i][sizeof("maxbufsize")] ) ) {
 958                                 got_maxbufsize++;
 959                                 maxbufsize = atoi( &props[i][sizeof("maxbufsize")] );
 960                         } else {
 961                                 return LDAP_NOT_SUPPORTED;
 962                         }
 963
 964                         if( maxbufsize && (( maxbufsize < SASL_MIN_BUFF_SIZE )
 965                                 || (maxbufsize > SASL_MAX_BUFF_SIZE )))
 966                         {
 967                                 /* bad maxbufsize */
 968                                 return LDAP_PARAM_ERROR;
 969                         }
 970
 971                 } else {
 972                         return LDAP_NOT_SUPPORTED;
 973                 }
 974         }
 975
 976         if(got_sflags) {
 977                 secprops->security_flags = sflags;
 978         }
 979         if(got_min_ssf) {
 980                 secprops->min_ssf = min_ssf;
 981         }
 982         if(got_max_ssf) {
 983                 secprops->max_ssf = max_ssf;
 984         }
 985         if(got_maxbufsize) {
 986                 secprops->maxbufsize = maxbufsize;
 987         }
 988
 989         ldap_charray_free( props );
 990         return LDAP_SUCCESS;
 991 }
 992
 993 int
 994 ldap_int_sasl_config( struct ldapoptions *lo, int option, const char *arg )
 995 {
 996         int rc;
 997
 998         switch( option ) {
 999         case LDAP_OPT_X_SASL_SECPROPS:
1000                 rc = ldap_pvt_sasl_secprops( arg, &lo->ldo_sasl_secprops );
1001                 if( rc == LDAP_SUCCESS ) return 0;
1002         }
1003
1004         return -1;
1005 }
1006
1007 int
1008 ldap_int_sasl_get_option( LDAP *ld, int option, void *arg )
1009 {
1010         if ( ld == NULL )
1011                 return -1;
1012
1013         switch ( option ) {
1014                 case LDAP_OPT_X_SASL_MECH: {
1015                         *(char **)arg = ld->ld_options.ldo_def_sasl_mech
1016                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_mech ) : NULL;
1017                 } break;
1018                 case LDAP_OPT_X_SASL_REALM: {
1019                         *(char **)arg = ld->ld_options.ldo_def_sasl_realm
1020                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_realm ) : NULL;
1021                 } break;
1022                 case LDAP_OPT_X_SASL_AUTHCID: {
1023                         *(char **)arg = ld->ld_options.ldo_def_sasl_authcid
1024                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_authcid ) : NULL;
1025                 } break;
1026                 case LDAP_OPT_X_SASL_AUTHZID: {
1027                         *(char **)arg = ld->ld_options.ldo_def_sasl_authzid
1028                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_authzid ) : NULL;
1029                 } break;
1030
1031                 case LDAP_OPT_X_SASL_SSF: {
1032                         int sc;
1033                         sasl_ssf_t      *ssf;
1034                         sasl_conn_t *ctx;
1035
1036                         if( ld->ld_defconn == NULL ) {
1037                                 return -1;
1038                         }
1039
1040                         ctx = ld->ld_defconn->lconn_sasl_sockctx;
1041
1042                         if ( ctx == NULL ) {
1043                                 return -1;
1044                         }
1045
1046                         sc = sasl_getprop( ctx, SASL_SSF,
1047                                 (SASL_CONST void **) &ssf );
1048
1049                         if ( sc != SASL_OK ) {
1050                                 return -1;
1051                         }
1052
1053                         *(ber_len_t *)arg = *ssf;
1054                 } break;
1055
1056                 case LDAP_OPT_X_SASL_SSF_EXTERNAL:
1057                         /* this option is write only */
1058                         return -1;
1059
1060                 case LDAP_OPT_X_SASL_SSF_MIN:
1061                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.min_ssf;
1062                         break;
1063                 case LDAP_OPT_X_SASL_SSF_MAX:
1064                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.max_ssf;
1065                         break;
1066                 case LDAP_OPT_X_SASL_MAXBUFSIZE:
1067                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.maxbufsize;
1068                         break;
1069
1070                 case LDAP_OPT_X_SASL_SECPROPS:
1071                         /* this option is write only */
1072                         return -1;
1073
1074                 default:
1075                         return -1;
1076         }
1077         return 0;
1078 }
1079
1080 int
1081 ldap_int_sasl_set_option( LDAP *ld, int option, void *arg )
1082 {
1083         if ( ld == NULL )
1084                 return -1;
1085
1086         switch ( option ) {
1087         case LDAP_OPT_X_SASL_SSF:
1088                 /* This option is read-only */
1089                 return -1;
1090
1091         case LDAP_OPT_X_SASL_SSF_EXTERNAL: {
1092                 int sc;
1093 #if SASL_VERSION_MAJOR < 2
1094                 sasl_external_properties_t extprops;
1095 #endif
1096                 sasl_conn_t *ctx;
1097
1098                 if( ld->ld_defconn == NULL ) {
1099                         return -1;
1100                 }
1101
1102                 ctx = ld->ld_defconn->lconn_sasl_authctx;
1103
1104                 if ( ctx == NULL ) {
1105                         return -1;
1106                 }
1107
1108 #if SASL_VERSION_MAJOR >= 2
1109                 sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, arg);
1110 #else
1111                 memset(&extprops, 0L, sizeof(extprops));
1112
1113                 extprops.ssf = * (ber_len_t *) arg;
1114
1115                 sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
1116                         (void *) &extprops );
1117 #endif
1118
1119                 if ( sc != SASL_OK ) {
1120                         return -1;
1121                 }
1122                 } break;
1123
1124         case LDAP_OPT_X_SASL_SSF_MIN:
1125                 ld->ld_options.ldo_sasl_secprops.min_ssf = *(ber_len_t *)arg;
1126                 break;
1127         case LDAP_OPT_X_SASL_SSF_MAX:
1128                 ld->ld_options.ldo_sasl_secprops.max_ssf = *(ber_len_t *)arg;
1129                 break;
1130         case LDAP_OPT_X_SASL_MAXBUFSIZE:
1131                 ld->ld_options.ldo_sasl_secprops.maxbufsize = *(ber_len_t *)arg;
1132                 break;
1133
1134         case LDAP_OPT_X_SASL_SECPROPS: {
1135                 int sc;
1136                 sc = ldap_pvt_sasl_secprops( (char *) arg,
1137                         &ld->ld_options.ldo_sasl_secprops );
1138
1139                 return sc == LDAP_SUCCESS ? 0 : -1;
1140                 }
1141
1142         default:
1143                 return -1;
1144         }
1145         return 0;
1146 }
1147
1148 #ifdef LDAP_R_COMPILE
1149 #define LDAP_DEBUG_R_SASL
1150 void *ldap_pvt_sasl_mutex_new(void)
1151 {
1152         ldap_pvt_thread_mutex_t *mutex;
1153
1154         mutex = (ldap_pvt_thread_mutex_t *) LDAP_MALLOC(
1155                 sizeof(ldap_pvt_thread_mutex_t) );
1156
1157         if ( ldap_pvt_thread_mutex_init( mutex ) == 0 ) {
1158                 return mutex;
1159         }
1160 #ifndef LDAP_DEBUG_R_SASL
1161         assert( 0 );
1162 #endif /* !LDAP_DEBUG_R_SASL */
1163         return NULL;
1164 }
1165
1166 int ldap_pvt_sasl_mutex_lock(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_lock( (ldap_pvt_thread_mutex_t *)mutex )
1176                 ? SASL_FAIL : SASL_OK;
1177 }
1178
1179 int ldap_pvt_sasl_mutex_unlock(void *mutex)
1180 {
1181 #ifdef LDAP_DEBUG_R_SASL
1182         if ( mutex == NULL ) {
1183                 return SASL_OK;
1184         }
1185 #else /* !LDAP_DEBUG_R_SASL */
1186         assert( mutex );
1187 #endif /* !LDAP_DEBUG_R_SASL */
1188         return ldap_pvt_thread_mutex_unlock( (ldap_pvt_thread_mutex_t *)mutex )
1189                 ? SASL_FAIL : SASL_OK;
1190 }
1191
1192 void ldap_pvt_sasl_mutex_dispose(void *mutex)
1193 {
1194 #ifdef LDAP_DEBUG_R_SASL
1195         if ( mutex == NULL ) {
1196                 return;
1197         }
1198 #else /* !LDAP_DEBUG_R_SASL */
1199         assert( mutex );
1200 #endif /* !LDAP_DEBUG_R_SASL */
1201         (void) ldap_pvt_thread_mutex_destroy( (ldap_pvt_thread_mutex_t *)mutex );
1202         LDAP_FREE( mutex );
1203 }
1204 #endif
1205
1206 #else
1207 int ldap_int_sasl_init( void )
1208 { return LDAP_SUCCESS; }
1209
1210 int ldap_int_sasl_close( LDAP *ld, LDAPConn *lc )
1211 { return LDAP_SUCCESS; }
1212
1213 int
1214 ldap_int_sasl_bind(
1215         LDAP                    *ld,
1216         const char              *dn,
1217         const char              *mechs,
1218         LDAPControl             **sctrls,
1219         LDAPControl             **cctrls,
1220         unsigned                flags,
1221         LDAP_SASL_INTERACT_PROC *interact,
1222         void * defaults )
1223 { return LDAP_NOT_SUPPORTED; }
1224
1225 int
1226 ldap_int_sasl_external(
1227         LDAP *ld,
1228         LDAPConn *conn,
1229         const char * authid,
1230         ber_len_t ssf )
1231 { return LDAP_SUCCESS; }
1232
1233 #endif /* HAVE_CYRUS_SASL */