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                         p->sec_buf_in.buf_ptr,
 269                         4 - p->sec_buf_in.buf_ptr );
 270 #ifdef EINTR
 271                 if ( ( ret < 0 ) && ( errno == EINTR ) )
 272                         continue;
 273 #endif
 274                 if ( ret <= 0 )
 275                         return bufptr ? bufptr : ret;
 276
 277                 p->sec_buf_in.buf_ptr += ret;
 278         }
 279
 280         /* The new packet always starts at p->sec_buf_in.buf_base */
 281         ret = sb_sasl_pkt_length( (unsigned char *) p->sec_buf_in.buf_base,
 282                 sbiod->sbiod_sb->sb_debug );
 283
 284         /* Grow the packet buffer if neccessary */
 285         if ( ( p->sec_buf_in.buf_size < (ber_len_t) ret ) &&
 286                 ber_pvt_sb_grow_buffer( &p->sec_buf_in, ret ) < 0 )
 287         {
 288                 errno = ENOMEM;
 289                 return -1;
 290         }
 291         p->sec_buf_in.buf_end = ret;
 292
 293         /* Did we read the whole encrypted packet? */
 294         while ( p->sec_buf_in.buf_ptr < p->sec_buf_in.buf_end ) {
 295                 /* No, we have got only a part of it */
 296                 ret = p->sec_buf_in.buf_end - p->sec_buf_in.buf_ptr;
 297
 298                 ret = LBER_SBIOD_READ_NEXT( sbiod, p->sec_buf_in.buf_base +
 299                         p->sec_buf_in.buf_ptr, ret );
 300 #ifdef EINTR
 301                 if ( ( ret < 0 ) && ( errno == EINTR ) )
 302                         continue;
 303 #endif
 304                 if ( ret <= 0 )
 305                         return bufptr ? bufptr : ret;
 306
 307                 p->sec_buf_in.buf_ptr += ret;
 308         }
 309
 310         /* Decode the packet */
 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 *)&p->buf_in.buf_end );
 315
 316         /* Drop the packet from the input buffer */
 317         sb_sasl_drop_packet( &p->sec_buf_in, sbiod->sbiod_sb->sb_debug );
 318
 319         if ( ret != SASL_OK ) {
 320                 ber_log_printf( LDAP_DEBUG_ANY, sbiod->sbiod_sb->sb_debug,
 321                         "sb_sasl_read: failed to decode packet: %s\n",
 322                         sasl_errstring( ret, NULL, NULL ) );
 323                 errno = EIO;
 324                 return -1;
 325         }
 326
 327         p->buf_in.buf_size = p->buf_in.buf_end;
 328
 329         bufptr += ber_pvt_sb_copy_out( &p->buf_in, (char*) buf + bufptr, len );
 330
 331         return bufptr;
 332 }
 333
 334 static ber_slen_t
 335 sb_sasl_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
 336 {
 337         struct sb_sasl_data     *p;
 338         int                     ret;
 339
 340         assert( sbiod != NULL );
 341         assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
 342
 343         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 344
 345         /* Are there anything left in the buffer? */
 346         if ( p->buf_out.buf_ptr != p->buf_out.buf_end ) {
 347                 ret = ber_pvt_sb_do_write( sbiod, &p->buf_out );
 348                 if ( ret < 0 )
 349                         return ret;
 350                 /* Still have something left?? */
 351                 if ( p->buf_out.buf_ptr != p->buf_out.buf_end ) {
 352                         errno = EAGAIN;
 353                         return 0;
 354                 }
 355         }
 356
 357         /* now encode the next packet. */
 358 #if SASL_VERSION_MAJOR >= 2
 359         ber_pvt_sb_buf_init( &p->buf_out );
 360 #else
 361         ber_pvt_sb_buf_destroy( &p->buf_out );
 362 #endif
 363         if ( len > *p->sasl_maxbuf - 100 )
 364                 len = *p->sasl_maxbuf - 100;    /* For safety margin */
 365         ret = sasl_encode( p->sasl_context, buf, len,
 366                 (SASL_CONST char **)&p->buf_out.buf_base,
 367                 (unsigned *)&p->buf_out.buf_size );
 368         if ( ret != SASL_OK ) {
 369                 ber_log_printf( LDAP_DEBUG_ANY, sbiod->sbiod_sb->sb_debug,
 370                         "sb_sasl_write: failed to encode packet: %s\n",
 371                         sasl_errstring( ret, NULL, NULL ) );
 372                 return -1;
 373         }
 374         p->buf_out.buf_end = p->buf_out.buf_size;
 375
 376         ret = ber_pvt_sb_do_write( sbiod, &p->buf_out );
 377         if ( ret <= 0 ) {
 378                 /* caller will retry, so clear this buffer out */
 379                 p->buf_out.buf_ptr = p->buf_out.buf_end;
 380                 return ret;
 381         }
 382         return len;
 383 }
 384
 385 static int
 386 sb_sasl_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
 387 {
 388         struct sb_sasl_data     *p;
 389
 390         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 391
 392         if ( opt == LBER_SB_OPT_DATA_READY ) {
 393                 if ( p->buf_in.buf_ptr != p->buf_in.buf_end )
 394                         return 1;
 395         }
 396
 397         return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
 398 }
 399
 400 Sockbuf_IO ldap_pvt_sockbuf_io_sasl = {
 401         sb_sasl_setup,          /* sbi_setup */
 402         sb_sasl_remove,         /* sbi_remove */
 403         sb_sasl_ctrl,           /* sbi_ctrl */
 404         sb_sasl_read,           /* sbi_read */
 405         sb_sasl_write,          /* sbi_write */
 406         NULL                    /* sbi_close */
 407 };
 408
 409 int ldap_pvt_sasl_install( Sockbuf *sb, void *ctx_arg )
 410 {
 411 #ifdef NEW_LOGGING
 412         LDAP_LOG ( TRANSPORT, ENTRY, "ldap_pvt_sasl_install\n", 0, 0, 0 );
 413 #else
 414         Debug( LDAP_DEBUG_TRACE, "ldap_pvt_sasl_install\n",
 415                 0, 0, 0 );
 416 #endif
 417
 418         /* don't install the stuff unless security has been negotiated */
 419
 420         if ( !ber_sockbuf_ctrl( sb, LBER_SB_OPT_HAS_IO,
 421                         &ldap_pvt_sockbuf_io_sasl ) )
 422         {
 423 #ifdef LDAP_DEBUG
 424                 ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
 425                         LBER_SBIOD_LEVEL_APPLICATION, (void *)"sasl_" );
 426 #endif
 427                 ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_sasl,
 428                         LBER_SBIOD_LEVEL_APPLICATION, ctx_arg );
 429         }
 430
 431         return LDAP_SUCCESS;
 432 }
 433
 434 void ldap_pvt_sasl_remove( Sockbuf *sb )
 435 {
 436         ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_sasl,
 437                 LBER_SBIOD_LEVEL_APPLICATION );
 438 #ifdef LDAP_DEBUG
 439         ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
 440                 LBER_SBIOD_LEVEL_APPLICATION );
 441 #endif
 442 }
 443
 444 static int
 445 sasl_err2ldap( int saslerr )
 446 {
 447         int rc;
 448
 449         switch (saslerr) {
 450                 case SASL_CONTINUE:
 451                         rc = LDAP_MORE_RESULTS_TO_RETURN;
 452                         break;
 453                 case SASL_INTERACT:
 454                         rc = LDAP_LOCAL_ERROR;
 455                         break;
 456                 case SASL_OK:
 457                         rc = LDAP_SUCCESS;
 458                         break;
 459                 case SASL_FAIL:
 460                         rc = LDAP_LOCAL_ERROR;
 461                         break;
 462                 case SASL_NOMEM:
 463                         rc = LDAP_NO_MEMORY;
 464                         break;
 465                 case SASL_NOMECH:
 466                         rc = LDAP_AUTH_UNKNOWN;
 467                         break;
 468                 case SASL_BADAUTH:
 469                         rc = LDAP_AUTH_UNKNOWN;
 470                         break;
 471                 case SASL_NOAUTHZ:
 472                         rc = LDAP_PARAM_ERROR;
 473                         break;
 474                 case SASL_TOOWEAK:
 475                 case SASL_ENCRYPT:
 476                         rc = LDAP_AUTH_UNKNOWN;
 477                         break;
 478                 default:
 479                         rc = LDAP_LOCAL_ERROR;
 480                         break;
 481         }
 482
 483         assert( rc == LDAP_SUCCESS || LDAP_API_ERROR( rc ) );
 484         return rc;
 485 }
 486
 487 int
 488 ldap_int_sasl_open(
 489         LDAP *ld,
 490         LDAPConn *lc,
 491         const char * host )
 492 {
 493         int rc;
 494         sasl_conn_t *ctx;
 495
 496         assert( lc->lconn_sasl_authctx == NULL );
 497
 498         if ( host == NULL ) {
 499                 ld->ld_errno = LDAP_LOCAL_ERROR;
 500                 return ld->ld_errno;
 501         }
 502
 503         if ( ldap_int_sasl_init() ) {
 504                 ld->ld_errno = LDAP_LOCAL_ERROR;
 505                 return ld->ld_errno;
 506         }
 507
 508 #if SASL_VERSION_MAJOR >= 2
 509         rc = sasl_client_new( "ldap", host, NULL, NULL,
 510                 client_callbacks, 0, &ctx );
 511 #else
 512         rc = sasl_client_new( "ldap", host, client_callbacks,
 513                 SASL_SECURITY_LAYER, &ctx );
 514 #endif
 515
 516         if ( rc != SASL_OK ) {
 517                 ld->ld_errno = sasl_err2ldap( rc );
 518                 return ld->ld_errno;
 519         }
 520
 521 #ifdef NEW_LOGGING
 522         LDAP_LOG ( TRANSPORT, DETAIL1, "ldap_int_sasl_open: host=%s\n",
 523                 host, 0, 0 );
 524 #else
 525         Debug( LDAP_DEBUG_TRACE, "ldap_int_sasl_open: host=%s\n",
 526                 host, 0, 0 );
 527 #endif
 528
 529         lc->lconn_sasl_authctx = ctx;
 530
 531         return LDAP_SUCCESS;
 532 }
 533
 534 int ldap_int_sasl_close( LDAP *ld, LDAPConn *lc )
 535 {
 536         sasl_conn_t *ctx = lc->lconn_sasl_authctx;
 537
 538         if( ctx != NULL ) {
 539                 sasl_dispose( &ctx );
 540                 if ( lc->lconn_sasl_sockctx &&
 541                         lc->lconn_sasl_authctx != lc->lconn_sasl_sockctx ) {
 542                         ctx = lc->lconn_sasl_sockctx;
 543                         sasl_dispose( &ctx );
 544                 }
 545                 lc->lconn_sasl_sockctx = NULL;
 546                 lc->lconn_sasl_authctx = NULL;
 547         }
 548
 549         return LDAP_SUCCESS;
 550 }
 551
 552 int
 553 ldap_int_sasl_bind(
 554         LDAP                    *ld,
 555         const char              *dn,
 556         const char              *mechs,
 557         LDAPControl             **sctrls,
 558         LDAPControl             **cctrls,
 559         unsigned                flags,
 560         LDAP_SASL_INTERACT_PROC *interact,
 561         void * defaults )
 562 {
 563         char *data;
 564         const char *mech = NULL;
 565         const char *pmech = NULL;
 566         int                     saslrc, rc;
 567         sasl_ssf_t              *ssf = NULL;
 568         sasl_conn_t     *ctx, *oldctx = NULL;
 569         sasl_interact_t *prompts = NULL;
 570         unsigned credlen;
 571         struct berval ccred;
 572         ber_socket_t            sd;
 573         void    *ssl;
 574
 575 #ifdef NEW_LOGGING
 576         LDAP_LOG ( TRANSPORT, ARGS, "ldap_int_sasl_bind: %s\n",
 577                 mechs ? mechs : "<null>", 0, 0 );
 578 #else
 579         Debug( LDAP_DEBUG_TRACE, "ldap_int_sasl_bind: %s\n",
 580                 mechs ? mechs : "<null>", 0, 0 );
 581 #endif
 582
 583         /* do a quick !LDAPv3 check... ldap_sasl_bind will do the rest. */
 584         if (ld->ld_version < LDAP_VERSION3) {
 585                 ld->ld_errno = LDAP_NOT_SUPPORTED;
 586                 return ld->ld_errno;
 587         }
 588
 589         ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, &sd );
 590
 591         if ( sd == AC_SOCKET_INVALID ) {
 592                 /* not connected yet */
 593                 int rc;
 594
 595                 rc = ldap_open_defconn( ld );
 596                 if( rc < 0 ) return ld->ld_errno;
 597
 598                 ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, &sd );
 599
 600                 if( sd == AC_SOCKET_INVALID ) {
 601                         ld->ld_errno = LDAP_LOCAL_ERROR;
 602                         return ld->ld_errno;
 603                 }
 604         }
 605
 606         oldctx = ld->ld_defconn->lconn_sasl_authctx;
 607
 608         /* If we already have an authentication context, clear it out */
 609         if( oldctx ) {
 610                 if ( oldctx != ld->ld_defconn->lconn_sasl_sockctx ) {
 611                         sasl_dispose( &oldctx );
 612                 }
 613                 ld->ld_defconn->lconn_sasl_authctx = NULL;
 614         }
 615
 616         { char *saslhost = ldap_host_connected_to( ld->ld_sb, "localhost" );
 617         rc = ldap_int_sasl_open( ld, ld->ld_defconn, saslhost );
 618         LDAP_FREE( saslhost );
 619         }
 620
 621         if ( rc != LDAP_SUCCESS ) return rc;
 622
 623         ctx = ld->ld_defconn->lconn_sasl_authctx;
 624
 625         /* Check for TLS */
 626         ssl = ldap_pvt_tls_sb_ctx( ld->ld_sb );
 627         if ( ssl ) {
 628                 struct berval authid = BER_BVNULL;
 629                 ber_len_t fac;
 630
 631                 fac = ldap_pvt_tls_get_strength( ssl );
 632                 /* failure is OK, we just can't use SASL EXTERNAL */
 633                 (void) ldap_pvt_tls_get_my_dn( ssl, &authid, NULL, 0 );
 634
 635                 (void) ldap_int_sasl_external( ld, ld->ld_defconn, authid.bv_val, fac );
 636                 LDAP_FREE( authid.bv_val );
 637         }
 638
 639 #if !defined(_WIN32)
 640         /* Check for local */
 641         if ( ldap_pvt_url_scheme2proto( ld->ld_defconn->lconn_server->lud_scheme ) == LDAP_PROTO_IPC ) {
 642                 char authid[sizeof("uidNumber=4294967295+gidNumber=4294967295,"
 643                         "cn=peercred,cn=external,cn=auth")];
 644                 sprintf( authid, "uidNumber=%d+gidNumber=%d,"
 645                         "cn=peercred,cn=external,cn=auth",
 646                         (int) geteuid(), (int) getegid() );
 647                 (void) ldap_int_sasl_external( ld, ld->ld_defconn, authid, LDAP_PVT_SASL_LOCAL_SSF );
 648         }
 649 #endif
 650
 651         /* (re)set security properties */
 652         sasl_setprop( ctx, SASL_SEC_PROPS,
 653                 &ld->ld_options.ldo_sasl_secprops );
 654
 655         ccred.bv_val = NULL;
 656         ccred.bv_len = 0;
 657
 658         do {
 659                 saslrc = sasl_client_start( ctx,
 660                         mechs,
 661 #if SASL_VERSION_MAJOR < 2
 662                         NULL,
 663 #endif
 664                         &prompts,
 665                         (SASL_CONST char **)&ccred.bv_val,
 666                         &credlen,
 667                         &mech );
 668
 669                 if( pmech == NULL && mech != NULL ) {
 670                         pmech = mech;
 671
 672                         if( flags != LDAP_SASL_QUIET ) {
 673                                 fprintf(stderr,
 674                                         "SASL/%s authentication started\n",
 675                                         pmech );
 676                         }
 677                 }
 678
 679                 if( saslrc == SASL_INTERACT ) {
 680                         int res;
 681                         if( !interact ) break;
 682                         res = (interact)( ld, flags, defaults, prompts );
 683
 684                         if( res != LDAP_SUCCESS ) break;
 685                 }
 686         } while ( saslrc == SASL_INTERACT );
 687
 688         ccred.bv_len = credlen;
 689
 690         if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 691                 rc = ld->ld_errno = sasl_err2ldap( saslrc );
 692 #if SASL_VERSION_MAJOR >= 2
 693                 ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 694 #endif
 695                 goto done;
 696         }
 697
 698         do {
 699                 struct berval *scred;
 700                 unsigned credlen;
 701
 702                 scred = NULL;
 703
 704                 rc = ldap_sasl_bind_s( ld, dn, mech, &ccred, sctrls, cctrls, &scred );
 705
 706                 if ( ccred.bv_val != NULL ) {
 707 #if SASL_VERSION_MAJOR < 2
 708                         LDAP_FREE( ccred.bv_val );
 709 #endif
 710                         ccred.bv_val = NULL;
 711                 }
 712
 713                 if ( rc != LDAP_SUCCESS && rc != LDAP_SASL_BIND_IN_PROGRESS ) {
 714                         if( scred && scred->bv_len ) {
 715                                 /* and server provided us with data? */
 716 #ifdef NEW_LOGGING
 717                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 718                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 719                                         rc, saslrc, scred->bv_len );
 720 #else
 721                                 Debug( LDAP_DEBUG_TRACE,
 722                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 723                                         rc, saslrc, scred->bv_len );
 724 #endif
 725                                 ber_bvfree( scred );
 726                         }
 727                         rc = ld->ld_errno;
 728                         goto done;
 729                 }
 730
 731                 if( rc == LDAP_SUCCESS && saslrc == SASL_OK ) {
 732                         /* we're done, no need to step */
 733                         if( scred && scred->bv_len ) {
 734                                 /* but server provided us with data! */
 735 #ifdef NEW_LOGGING
 736                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 737                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 738                                         rc, saslrc, scred->bv_len );
 739 #else
 740                                 Debug( LDAP_DEBUG_TRACE,
 741                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 742                                         rc, saslrc, scred->bv_len );
 743 #endif
 744                                 ber_bvfree( scred );
 745                                 rc = ld->ld_errno = LDAP_LOCAL_ERROR;
 746                                 goto done;
 747                         }
 748                         break;
 749                 }
 750
 751                 do {
 752                         saslrc = sasl_client_step( ctx,
 753                                 (scred == NULL) ? NULL : scred->bv_val,
 754                                 (scred == NULL) ? 0 : scred->bv_len,
 755                                 &prompts,
 756                                 (SASL_CONST char **)&ccred.bv_val,
 757                                 &credlen );
 758
 759 #ifdef NEW_LOGGING
 760                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 761                                         "ldap_int_sasl_bind: sasl_client_step: %d\n", saslrc,0,0 );
 762 #else
 763                         Debug( LDAP_DEBUG_TRACE, "sasl_client_step: %d\n",
 764                                 saslrc, 0, 0 );
 765 #endif
 766
 767                         if( saslrc == SASL_INTERACT ) {
 768                                 int res;
 769                                 if( !interact ) break;
 770                                 res = (interact)( ld, flags, defaults, prompts );
 771                                 if( res != LDAP_SUCCESS ) break;
 772                         }
 773                 } while ( saslrc == SASL_INTERACT );
 774
 775                 ccred.bv_len = credlen;
 776                 ber_bvfree( scred );
 777
 778                 if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 779                         ld->ld_errno = sasl_err2ldap( saslrc );
 780 #if SASL_VERSION_MAJOR >= 2
 781                         ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 782 #endif
 783                         rc = ld->ld_errno;
 784                         goto done;
 785                 }
 786         } while ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 787
 788         if ( rc != LDAP_SUCCESS ) goto done;
 789
 790         if ( saslrc != SASL_OK ) {
 791 #if SASL_VERSION_MAJOR >= 2
 792                 ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 793 #endif
 794                 rc = ld->ld_errno = sasl_err2ldap( saslrc );
 795                 goto done;
 796         }
 797
 798         if( flags != LDAP_SASL_QUIET ) {
 799                 saslrc = sasl_getprop( ctx, SASL_USERNAME, (SASL_CONST void **) &data );
 800                 if( saslrc == SASL_OK && data && *data ) {
 801                         fprintf( stderr, "SASL username: %s\n", data );
 802                 }
 803
 804 #if SASL_VERSION_MAJOR < 2
 805                 saslrc = sasl_getprop( ctx, SASL_REALM, (SASL_CONST void **) &data );
 806                 if( saslrc == SASL_OK && data && *data ) {
 807                         fprintf( stderr, "SASL realm: %s\n", data );
 808                 }
 809 #endif
 810         }
 811
 812         saslrc = sasl_getprop( ctx, SASL_SSF, (SASL_CONST void **) &ssf );
 813         if( saslrc == SASL_OK ) {
 814                 if( flags != LDAP_SASL_QUIET ) {
 815                         fprintf( stderr, "SASL SSF: %lu\n",
 816                                 (unsigned long) *ssf );
 817                 }
 818
 819                 if( ssf && *ssf ) {
 820                         if( flags != LDAP_SASL_QUIET ) {
 821                                 fprintf( stderr, "SASL installing layers\n" );
 822                         }
 823                         if ( ld->ld_defconn->lconn_sasl_sockctx ) {
 824                                 oldctx = ld->ld_defconn->lconn_sasl_sockctx;
 825                                 sasl_dispose( &oldctx );
 826                                 ldap_pvt_sasl_remove( ld->ld_sb );
 827                         }
 828                         ldap_pvt_sasl_install( ld->ld_conns->lconn_sb, ctx );
 829                         ld->ld_defconn->lconn_sasl_sockctx = ctx;
 830                 }
 831         }
 832         ld->ld_defconn->lconn_sasl_authctx = ctx;
 833
 834 done:
 835         return rc;
 836 }
 837
 838 int
 839 ldap_int_sasl_external(
 840         LDAP *ld,
 841         LDAPConn *conn,
 842         const char * authid,
 843         ber_len_t ssf )
 844 {
 845         int sc;
 846         sasl_conn_t *ctx;
 847 #if SASL_VERSION_MAJOR < 2
 848         sasl_external_properties_t extprops;
 849 #endif
 850
 851         ctx = conn->lconn_sasl_authctx;
 852
 853         if ( ctx == NULL ) {
 854                 return LDAP_LOCAL_ERROR;
 855         }
 856
 857 #if SASL_VERSION_MAJOR >= 2
 858         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, &ssf );
 859         if ( sc == SASL_OK )
 860                 sc = sasl_setprop( ctx, SASL_AUTH_EXTERNAL, authid );
 861 #else
 862         memset( &extprops, '\0', sizeof(extprops) );
 863         extprops.ssf = ssf;
 864         extprops.auth_id = (char *) authid;
 865
 866         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
 867                 (void *) &extprops );
 868 #endif
 869
 870         if ( sc != SASL_OK ) {
 871                 return LDAP_LOCAL_ERROR;
 872         }
 873
 874         return LDAP_SUCCESS;
 875 }
 876
 877
 878 int ldap_pvt_sasl_secprops(
 879         const char *in,
 880         sasl_security_properties_t *secprops )
 881 {
 882         int i;
 883         char **props = ldap_str2charray( in, "," );
 884         unsigned sflags = 0;
 885         int got_sflags = 0;
 886         sasl_ssf_t max_ssf = 0;
 887         int got_max_ssf = 0;
 888         sasl_ssf_t min_ssf = 0;
 889         int got_min_ssf = 0;
 890         unsigned maxbufsize = 0;
 891         int got_maxbufsize = 0;
 892
 893         if( props == NULL || secprops == NULL ) {
 894                 return LDAP_PARAM_ERROR;
 895         }
 896
 897         for( i=0; props[i]; i++ ) {
 898                 if( !strcasecmp(props[i], "none") ) {
 899                         got_sflags++;
 900
 901                 } else if( !strcasecmp(props[i], "noplain") ) {
 902                         got_sflags++;
 903                         sflags |= SASL_SEC_NOPLAINTEXT;
 904
 905                 } else if( !strcasecmp(props[i], "noactive") ) {
 906                         got_sflags++;
 907                         sflags |= SASL_SEC_NOACTIVE;
 908
 909                 } else if( !strcasecmp(props[i], "nodict") ) {
 910                         got_sflags++;
 911                         sflags |= SASL_SEC_NODICTIONARY;
 912
 913                 } else if( !strcasecmp(props[i], "forwardsec") ) {
 914                         got_sflags++;
 915                         sflags |= SASL_SEC_FORWARD_SECRECY;
 916
 917                 } else if( !strcasecmp(props[i], "noanonymous")) {
 918                         got_sflags++;
 919                         sflags |= SASL_SEC_NOANONYMOUS;
 920
 921                 } else if( !strcasecmp(props[i], "passcred") ) {
 922                         got_sflags++;
 923                         sflags |= SASL_SEC_PASS_CREDENTIALS;
 924
 925                 } else if( !strncasecmp(props[i],
 926                         "minssf=", sizeof("minssf")) )
 927                 {
 928                         if( isdigit( (unsigned char) props[i][sizeof("minssf")] ) ) {
 929                                 got_min_ssf++;
 930                                 min_ssf = atoi( &props[i][sizeof("minssf")] );
 931                         } else {
 932                                 return LDAP_NOT_SUPPORTED;
 933                         }
 934
 935                 } else if( !strncasecmp(props[i],
 936                         "maxssf=", sizeof("maxssf")) )
 937                 {
 938                         if( isdigit( (unsigned char) props[i][sizeof("maxssf")] ) ) {
 939                                 got_max_ssf++;
 940                                 max_ssf = atoi( &props[i][sizeof("maxssf")] );
 941                         } else {
 942                                 return LDAP_NOT_SUPPORTED;
 943                         }
 944
 945                 } else if( !strncasecmp(props[i],
 946                         "maxbufsize=", sizeof("maxbufsize")) )
 947                 {
 948                         if( isdigit( (unsigned char) props[i][sizeof("maxbufsize")] ) ) {
 949                                 got_maxbufsize++;
 950                                 maxbufsize = atoi( &props[i][sizeof("maxbufsize")] );
 951                         } else {
 952                                 return LDAP_NOT_SUPPORTED;
 953                         }
 954
 955                         if( maxbufsize && (( maxbufsize < SASL_MIN_BUFF_SIZE )
 956                                 || (maxbufsize > SASL_MAX_BUFF_SIZE )))
 957                         {
 958                                 /* bad maxbufsize */
 959                                 return LDAP_PARAM_ERROR;
 960                         }
 961
 962                 } else {
 963                         return LDAP_NOT_SUPPORTED;
 964                 }
 965         }
 966
 967         if(got_sflags) {
 968                 secprops->security_flags = sflags;
 969         }
 970         if(got_min_ssf) {
 971                 secprops->min_ssf = min_ssf;
 972         }
 973         if(got_max_ssf) {
 974                 secprops->max_ssf = max_ssf;
 975         }
 976         if(got_maxbufsize) {
 977                 secprops->maxbufsize = maxbufsize;
 978         }
 979
 980         ldap_charray_free( props );
 981         return LDAP_SUCCESS;
 982 }
 983
 984 int
 985 ldap_int_sasl_config( struct ldapoptions *lo, int option, const char *arg )
 986 {
 987         int rc;
 988
 989         switch( option ) {
 990         case LDAP_OPT_X_SASL_SECPROPS:
 991                 rc = ldap_pvt_sasl_secprops( arg, &lo->ldo_sasl_secprops );
 992                 if( rc == LDAP_SUCCESS ) return 0;
 993         }
 994
 995         return -1;
 996 }
 997
 998 int
 999 ldap_int_sasl_get_option( LDAP *ld, int option, void *arg )
1000 {
1001         if ( ld == NULL )
1002                 return -1;
1003
1004         switch ( option ) {
1005                 case LDAP_OPT_X_SASL_MECH: {
1006                         *(char **)arg = ld->ld_options.ldo_def_sasl_mech
1007                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_mech ) : NULL;
1008                 } break;
1009                 case LDAP_OPT_X_SASL_REALM: {
1010                         *(char **)arg = ld->ld_options.ldo_def_sasl_realm
1011                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_realm ) : NULL;
1012                 } break;
1013                 case LDAP_OPT_X_SASL_AUTHCID: {
1014                         *(char **)arg = ld->ld_options.ldo_def_sasl_authcid
1015                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_authcid ) : NULL;
1016                 } break;
1017                 case LDAP_OPT_X_SASL_AUTHZID: {
1018                         *(char **)arg = ld->ld_options.ldo_def_sasl_authzid
1019                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_authzid ) : NULL;
1020                 } break;
1021
1022                 case LDAP_OPT_X_SASL_SSF: {
1023                         int sc;
1024                         sasl_ssf_t      *ssf;
1025                         sasl_conn_t *ctx;
1026
1027                         if( ld->ld_defconn == NULL ) {
1028                                 return -1;
1029                         }
1030
1031                         ctx = ld->ld_defconn->lconn_sasl_sockctx;
1032
1033                         if ( ctx == NULL ) {
1034                                 return -1;
1035                         }
1036
1037                         sc = sasl_getprop( ctx, SASL_SSF,
1038                                 (SASL_CONST void **) &ssf );
1039
1040                         if ( sc != SASL_OK ) {
1041                                 return -1;
1042                         }
1043
1044                         *(ber_len_t *)arg = *ssf;
1045                 } break;
1046
1047                 case LDAP_OPT_X_SASL_SSF_EXTERNAL:
1048                         /* this option is write only */
1049                         return -1;
1050
1051                 case LDAP_OPT_X_SASL_SSF_MIN:
1052                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.min_ssf;
1053                         break;
1054                 case LDAP_OPT_X_SASL_SSF_MAX:
1055                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.max_ssf;
1056                         break;
1057                 case LDAP_OPT_X_SASL_MAXBUFSIZE:
1058                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.maxbufsize;
1059                         break;
1060
1061                 case LDAP_OPT_X_SASL_SECPROPS:
1062                         /* this option is write only */
1063                         return -1;
1064
1065                 default:
1066                         return -1;
1067         }
1068         return 0;
1069 }
1070
1071 int
1072 ldap_int_sasl_set_option( LDAP *ld, int option, void *arg )
1073 {
1074         if ( ld == NULL )
1075                 return -1;
1076
1077         switch ( option ) {
1078         case LDAP_OPT_X_SASL_SSF:
1079                 /* This option is read-only */
1080                 return -1;
1081
1082         case LDAP_OPT_X_SASL_SSF_EXTERNAL: {
1083                 int sc;
1084 #if SASL_VERSION_MAJOR < 2
1085                 sasl_external_properties_t extprops;
1086 #endif
1087                 sasl_conn_t *ctx;
1088
1089                 if( ld->ld_defconn == NULL ) {
1090                         return -1;
1091                 }
1092
1093                 ctx = ld->ld_defconn->lconn_sasl_authctx;
1094
1095                 if ( ctx == NULL ) {
1096                         return -1;
1097                 }
1098
1099 #if SASL_VERSION_MAJOR >= 2
1100                 sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, arg);
1101 #else
1102                 memset(&extprops, 0L, sizeof(extprops));
1103
1104                 extprops.ssf = * (ber_len_t *) arg;
1105
1106                 sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
1107                         (void *) &extprops );
1108 #endif
1109
1110                 if ( sc != SASL_OK ) {
1111                         return -1;
1112                 }
1113                 } break;
1114
1115         case LDAP_OPT_X_SASL_SSF_MIN:
1116                 ld->ld_options.ldo_sasl_secprops.min_ssf = *(ber_len_t *)arg;
1117                 break;
1118         case LDAP_OPT_X_SASL_SSF_MAX:
1119                 ld->ld_options.ldo_sasl_secprops.max_ssf = *(ber_len_t *)arg;
1120                 break;
1121         case LDAP_OPT_X_SASL_MAXBUFSIZE:
1122                 ld->ld_options.ldo_sasl_secprops.maxbufsize = *(ber_len_t *)arg;
1123                 break;
1124
1125         case LDAP_OPT_X_SASL_SECPROPS: {
1126                 int sc;
1127                 sc = ldap_pvt_sasl_secprops( (char *) arg,
1128                         &ld->ld_options.ldo_sasl_secprops );
1129
1130                 return sc == LDAP_SUCCESS ? 0 : -1;
1131                 }
1132
1133         default:
1134                 return -1;
1135         }
1136         return 0;
1137 }
1138
1139 #ifdef LDAP_R_COMPILE
1140 #define LDAP_DEBUG_R_SASL
1141 void *ldap_pvt_sasl_mutex_new(void)
1142 {
1143         ldap_pvt_thread_mutex_t *mutex;
1144
1145         mutex = (ldap_pvt_thread_mutex_t *) LDAP_MALLOC(
1146                 sizeof(ldap_pvt_thread_mutex_t) );
1147
1148         if ( ldap_pvt_thread_mutex_init( mutex ) == 0 ) {
1149                 return mutex;
1150         }
1151 #ifndef LDAP_DEBUG_R_SASL
1152         assert( 0 );
1153 #endif /* !LDAP_DEBUG_R_SASL */
1154         return NULL;
1155 }
1156
1157 int ldap_pvt_sasl_mutex_lock(void *mutex)
1158 {
1159 #ifdef LDAP_DEBUG_R_SASL
1160         if ( mutex == NULL ) {
1161                 return SASL_OK;
1162         }
1163 #else /* !LDAP_DEBUG_R_SASL */
1164         assert( mutex );
1165 #endif /* !LDAP_DEBUG_R_SASL */
1166         return ldap_pvt_thread_mutex_lock( (ldap_pvt_thread_mutex_t *)mutex )
1167                 ? SASL_FAIL : SASL_OK;
1168 }
1169
1170 int ldap_pvt_sasl_mutex_unlock(void *mutex)
1171 {
1172 #ifdef LDAP_DEBUG_R_SASL
1173         if ( mutex == NULL ) {
1174                 return SASL_OK;
1175         }
1176 #else /* !LDAP_DEBUG_R_SASL */
1177         assert( mutex );
1178 #endif /* !LDAP_DEBUG_R_SASL */
1179         return ldap_pvt_thread_mutex_unlock( (ldap_pvt_thread_mutex_t *)mutex )
1180                 ? SASL_FAIL : SASL_OK;
1181 }
1182
1183 void ldap_pvt_sasl_mutex_dispose(void *mutex)
1184 {
1185 #ifdef LDAP_DEBUG_R_SASL
1186         if ( mutex == NULL ) {
1187                 return;
1188         }
1189 #else /* !LDAP_DEBUG_R_SASL */
1190         assert( mutex );
1191 #endif /* !LDAP_DEBUG_R_SASL */
1192         (void) ldap_pvt_thread_mutex_destroy( (ldap_pvt_thread_mutex_t *)mutex );
1193         LDAP_FREE( mutex );
1194 }
1195 #endif
1196
1197 #else
1198 int ldap_int_sasl_init( void )
1199 { return LDAP_SUCCESS; }
1200
1201 int ldap_int_sasl_close( LDAP *ld, LDAPConn *lc )
1202 { return LDAP_SUCCESS; }
1203
1204 int
1205 ldap_int_sasl_bind(
1206         LDAP                    *ld,
1207         const char              *dn,
1208         const char              *mechs,
1209         LDAPControl             **sctrls,
1210         LDAPControl             **cctrls,
1211         unsigned                flags,
1212         LDAP_SASL_INTERACT_PROC *interact,
1213         void * defaults )
1214 { return LDAP_NOT_SUPPORTED; }
1215
1216 int
1217 ldap_int_sasl_external(
1218         LDAP *ld,
1219         LDAPConn *conn,
1220         const char * authid,
1221         ber_len_t ssf )
1222 { return LDAP_SUCCESS; }
1223
1224 #endif /* HAVE_CYRUS_SASL */