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 1998-2005 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 -1;
 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
 388         /* return number of bytes encoded, not written, to ensure
 389          * no byte is encoded twice (even if only sent once).
 390          */
 391         return len;
 392 }
 393
 394 static int
 395 sb_sasl_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
 396 {
 397         struct sb_sasl_data     *p;
 398
 399         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 400
 401         if ( opt == LBER_SB_OPT_DATA_READY ) {
 402                 if ( p->buf_in.buf_ptr != p->buf_in.buf_end ) return 1;
 403         }
 404
 405         return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
 406 }
 407
 408 Sockbuf_IO ldap_pvt_sockbuf_io_sasl = {
 409         sb_sasl_setup,          /* sbi_setup */
 410         sb_sasl_remove,         /* sbi_remove */
 411         sb_sasl_ctrl,           /* sbi_ctrl */
 412         sb_sasl_read,           /* sbi_read */
 413         sb_sasl_write,          /* sbi_write */
 414         NULL                    /* sbi_close */
 415 };
 416
 417 int ldap_pvt_sasl_install( Sockbuf *sb, void *ctx_arg )
 418 {
 419 #ifdef NEW_LOGGING
 420         LDAP_LOG ( TRANSPORT, ENTRY, "ldap_pvt_sasl_install\n", 0, 0, 0 );
 421 #else
 422         Debug( LDAP_DEBUG_TRACE, "ldap_pvt_sasl_install\n",
 423                 0, 0, 0 );
 424 #endif
 425
 426         /* don't install the stuff unless security has been negotiated */
 427
 428         if ( !ber_sockbuf_ctrl( sb, LBER_SB_OPT_HAS_IO,
 429                         &ldap_pvt_sockbuf_io_sasl ) )
 430         {
 431 #ifdef LDAP_DEBUG
 432                 ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
 433                         LBER_SBIOD_LEVEL_APPLICATION, (void *)"sasl_" );
 434 #endif
 435                 ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_sasl,
 436                         LBER_SBIOD_LEVEL_APPLICATION, ctx_arg );
 437         }
 438
 439         return LDAP_SUCCESS;
 440 }
 441
 442 void ldap_pvt_sasl_remove( Sockbuf *sb )
 443 {
 444         ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_sasl,
 445                 LBER_SBIOD_LEVEL_APPLICATION );
 446 #ifdef LDAP_DEBUG
 447         ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
 448                 LBER_SBIOD_LEVEL_APPLICATION );
 449 #endif
 450 }
 451
 452 static int
 453 sasl_err2ldap( int saslerr )
 454 {
 455         int rc;
 456
 457         switch (saslerr) {
 458                 case SASL_CONTINUE:
 459                         rc = LDAP_MORE_RESULTS_TO_RETURN;
 460                         break;
 461                 case SASL_INTERACT:
 462                         rc = LDAP_LOCAL_ERROR;
 463                         break;
 464                 case SASL_OK:
 465                         rc = LDAP_SUCCESS;
 466                         break;
 467                 case SASL_FAIL:
 468                         rc = LDAP_LOCAL_ERROR;
 469                         break;
 470                 case SASL_NOMEM:
 471                         rc = LDAP_NO_MEMORY;
 472                         break;
 473                 case SASL_NOMECH:
 474                         rc = LDAP_AUTH_UNKNOWN;
 475                         break;
 476                 case SASL_BADAUTH:
 477                         rc = LDAP_AUTH_UNKNOWN;
 478                         break;
 479                 case SASL_NOAUTHZ:
 480                         rc = LDAP_PARAM_ERROR;
 481                         break;
 482                 case SASL_TOOWEAK:
 483                 case SASL_ENCRYPT:
 484                         rc = LDAP_AUTH_UNKNOWN;
 485                         break;
 486                 default:
 487                         rc = LDAP_LOCAL_ERROR;
 488                         break;
 489         }
 490
 491         assert( rc == LDAP_SUCCESS || LDAP_API_ERROR( rc ) );
 492         return rc;
 493 }
 494
 495 int
 496 ldap_int_sasl_open(
 497         LDAP *ld,
 498         LDAPConn *lc,
 499         const char * host )
 500 {
 501         int rc;
 502         sasl_conn_t *ctx;
 503
 504         assert( lc->lconn_sasl_authctx == NULL );
 505
 506         if ( host == NULL ) {
 507                 ld->ld_errno = LDAP_LOCAL_ERROR;
 508                 return ld->ld_errno;
 509         }
 510
 511         if ( ldap_int_sasl_init() ) {
 512                 ld->ld_errno = LDAP_LOCAL_ERROR;
 513                 return ld->ld_errno;
 514         }
 515
 516 #if SASL_VERSION_MAJOR >= 2
 517         rc = sasl_client_new( "ldap", host, NULL, NULL,
 518                 client_callbacks, 0, &ctx );
 519 #else
 520         rc = sasl_client_new( "ldap", host, client_callbacks,
 521                 SASL_SECURITY_LAYER, &ctx );
 522 #endif
 523
 524         if ( rc != SASL_OK ) {
 525                 ld->ld_errno = sasl_err2ldap( rc );
 526                 return ld->ld_errno;
 527         }
 528
 529 #ifdef NEW_LOGGING
 530         LDAP_LOG ( TRANSPORT, DETAIL1, "ldap_int_sasl_open: host=%s\n",
 531                 host, 0, 0 );
 532 #else
 533         Debug( LDAP_DEBUG_TRACE, "ldap_int_sasl_open: host=%s\n",
 534                 host, 0, 0 );
 535 #endif
 536
 537         lc->lconn_sasl_authctx = ctx;
 538
 539         return LDAP_SUCCESS;
 540 }
 541
 542 int ldap_int_sasl_close( LDAP *ld, LDAPConn *lc )
 543 {
 544         sasl_conn_t *ctx = lc->lconn_sasl_authctx;
 545
 546         if( ctx != NULL ) {
 547                 sasl_dispose( &ctx );
 548                 if ( lc->lconn_sasl_sockctx &&
 549                         lc->lconn_sasl_authctx != lc->lconn_sasl_sockctx ) {
 550                         ctx = lc->lconn_sasl_sockctx;
 551                         sasl_dispose( &ctx );
 552                 }
 553                 lc->lconn_sasl_sockctx = NULL;
 554                 lc->lconn_sasl_authctx = NULL;
 555         }
 556
 557         return LDAP_SUCCESS;
 558 }
 559
 560 int
 561 ldap_int_sasl_bind(
 562         LDAP                    *ld,
 563         const char              *dn,
 564         const char              *mechs,
 565         LDAPControl             **sctrls,
 566         LDAPControl             **cctrls,
 567         unsigned                flags,
 568         LDAP_SASL_INTERACT_PROC *interact,
 569         void * defaults )
 570 {
 571         char *data;
 572         const char *mech = NULL;
 573         const char *pmech = NULL;
 574         int                     saslrc, rc;
 575         sasl_ssf_t              *ssf = NULL;
 576         sasl_conn_t     *ctx, *oldctx = NULL;
 577         sasl_interact_t *prompts = NULL;
 578         unsigned credlen;
 579         struct berval ccred;
 580         ber_socket_t            sd;
 581         void    *ssl;
 582
 583 #ifdef NEW_LOGGING
 584         LDAP_LOG ( TRANSPORT, ARGS, "ldap_int_sasl_bind: %s\n",
 585                 mechs ? mechs : "<null>", 0, 0 );
 586 #else
 587         Debug( LDAP_DEBUG_TRACE, "ldap_int_sasl_bind: %s\n",
 588                 mechs ? mechs : "<null>", 0, 0 );
 589 #endif
 590
 591         /* do a quick !LDAPv3 check... ldap_sasl_bind will do the rest. */
 592         if (ld->ld_version < LDAP_VERSION3) {
 593                 ld->ld_errno = LDAP_NOT_SUPPORTED;
 594                 return ld->ld_errno;
 595         }
 596
 597         ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, &sd );
 598
 599         if ( sd == AC_SOCKET_INVALID ) {
 600                 /* not connected yet */
 601                 int rc;
 602
 603                 rc = ldap_open_defconn( ld );
 604                 if( rc < 0 ) return ld->ld_errno;
 605
 606                 ber_sockbuf_ctrl( ld->ld_defconn->lconn_sb, LBER_SB_OPT_GET_FD, &sd );
 607
 608                 if( sd == AC_SOCKET_INVALID ) {
 609                         ld->ld_errno = LDAP_LOCAL_ERROR;
 610                         return ld->ld_errno;
 611                 }
 612         }
 613
 614         oldctx = ld->ld_defconn->lconn_sasl_authctx;
 615
 616         /* If we already have an authentication context, clear it out */
 617         if( oldctx ) {
 618                 if ( oldctx != ld->ld_defconn->lconn_sasl_sockctx ) {
 619                         sasl_dispose( &oldctx );
 620                 }
 621                 ld->ld_defconn->lconn_sasl_authctx = NULL;
 622         }
 623
 624         { char *saslhost = ldap_host_connected_to( ld->ld_defconn->lconn_sb, "localhost" );
 625         rc = ldap_int_sasl_open( ld, ld->ld_defconn, saslhost );
 626         LDAP_FREE( saslhost );
 627         }
 628
 629         if ( rc != LDAP_SUCCESS ) return rc;
 630
 631         ctx = ld->ld_defconn->lconn_sasl_authctx;
 632
 633         /* Check for TLS */
 634         ssl = ldap_pvt_tls_sb_ctx( ld->ld_defconn->lconn_sb );
 635         if ( ssl ) {
 636                 struct berval authid = BER_BVNULL;
 637                 ber_len_t fac;
 638
 639                 fac = ldap_pvt_tls_get_strength( ssl );
 640                 /* failure is OK, we just can't use SASL EXTERNAL */
 641                 (void) ldap_pvt_tls_get_my_dn( ssl, &authid, NULL, 0 );
 642
 643                 (void) ldap_int_sasl_external( ld, ld->ld_defconn, authid.bv_val, fac );
 644                 LDAP_FREE( authid.bv_val );
 645         }
 646
 647 #if !defined(_WIN32)
 648         /* Check for local */
 649         if ( ldap_pvt_url_scheme2proto( ld->ld_defconn->lconn_server->lud_scheme ) == LDAP_PROTO_IPC ) {
 650                 char authid[sizeof("uidNumber=4294967295+gidNumber=4294967295,"
 651                         "cn=peercred,cn=external,cn=auth")];
 652                 sprintf( authid, "uidNumber=%d+gidNumber=%d,"
 653                         "cn=peercred,cn=external,cn=auth",
 654                         (int) geteuid(), (int) getegid() );
 655                 (void) ldap_int_sasl_external( ld, ld->ld_defconn, authid, LDAP_PVT_SASL_LOCAL_SSF );
 656         }
 657 #endif
 658
 659         /* (re)set security properties */
 660         sasl_setprop( ctx, SASL_SEC_PROPS,
 661                 &ld->ld_options.ldo_sasl_secprops );
 662
 663         ccred.bv_val = NULL;
 664         ccred.bv_len = 0;
 665
 666         do {
 667                 saslrc = sasl_client_start( ctx,
 668                         mechs,
 669 #if SASL_VERSION_MAJOR < 2
 670                         NULL,
 671 #endif
 672                         &prompts,
 673                         (SASL_CONST char **)&ccred.bv_val,
 674                         &credlen,
 675                         &mech );
 676
 677                 if( pmech == NULL && mech != NULL ) {
 678                         pmech = mech;
 679
 680                         if( flags != LDAP_SASL_QUIET ) {
 681                                 fprintf(stderr,
 682                                         "SASL/%s authentication started\n",
 683                                         pmech );
 684                         }
 685                 }
 686
 687                 if( saslrc == SASL_INTERACT ) {
 688                         int res;
 689                         if( !interact ) break;
 690                         res = (interact)( ld, flags, defaults, prompts );
 691
 692                         if( res != LDAP_SUCCESS ) break;
 693                 }
 694         } while ( saslrc == SASL_INTERACT );
 695
 696         ccred.bv_len = credlen;
 697
 698         if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 699                 rc = ld->ld_errno = sasl_err2ldap( saslrc );
 700 #if SASL_VERSION_MAJOR >= 2
 701                 ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 702 #endif
 703                 goto done;
 704         }
 705
 706         do {
 707                 struct berval *scred;
 708                 unsigned credlen;
 709
 710                 scred = NULL;
 711
 712                 rc = ldap_sasl_bind_s( ld, dn, mech, &ccred, sctrls, cctrls, &scred );
 713
 714                 if ( ccred.bv_val != NULL ) {
 715 #if SASL_VERSION_MAJOR < 2
 716                         LDAP_FREE( ccred.bv_val );
 717 #endif
 718                         ccred.bv_val = NULL;
 719                 }
 720
 721                 if ( rc != LDAP_SUCCESS && rc != LDAP_SASL_BIND_IN_PROGRESS ) {
 722                         if( scred && scred->bv_len ) {
 723                                 /* and server provided us with data? */
 724 #ifdef NEW_LOGGING
 725                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 726                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 727                                         rc, saslrc, scred->bv_len );
 728 #else
 729                                 Debug( LDAP_DEBUG_TRACE,
 730                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 731                                         rc, saslrc, scred->bv_len );
 732 #endif
 733                                 ber_bvfree( scred );
 734                         }
 735                         rc = ld->ld_errno;
 736                         goto done;
 737                 }
 738
 739                 if( rc == LDAP_SUCCESS && saslrc == SASL_OK ) {
 740                         /* we're done, no need to step */
 741                         if( scred && scred->bv_len ) {
 742                                 /* but server provided us with data! */
 743 #ifdef NEW_LOGGING
 744                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 745                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 746                                         rc, saslrc, scred->bv_len );
 747 #else
 748                                 Debug( LDAP_DEBUG_TRACE,
 749                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 750                                         rc, saslrc, scred->bv_len );
 751 #endif
 752                                 ber_bvfree( scred );
 753                                 rc = ld->ld_errno = LDAP_LOCAL_ERROR;
 754                                 goto done;
 755                         }
 756                         break;
 757                 }
 758
 759                 do {
 760                         saslrc = sasl_client_step( ctx,
 761                                 (scred == NULL) ? NULL : scred->bv_val,
 762                                 (scred == NULL) ? 0 : scred->bv_len,
 763                                 &prompts,
 764                                 (SASL_CONST char **)&ccred.bv_val,
 765                                 &credlen );
 766
 767 #ifdef NEW_LOGGING
 768                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 769                                         "ldap_int_sasl_bind: sasl_client_step: %d\n", saslrc,0,0 );
 770 #else
 771                         Debug( LDAP_DEBUG_TRACE, "sasl_client_step: %d\n",
 772                                 saslrc, 0, 0 );
 773 #endif
 774
 775                         if( saslrc == SASL_INTERACT ) {
 776                                 int res;
 777                                 if( !interact ) break;
 778                                 res = (interact)( ld, flags, defaults, prompts );
 779                                 if( res != LDAP_SUCCESS ) break;
 780                         }
 781                 } while ( saslrc == SASL_INTERACT );
 782
 783                 ccred.bv_len = credlen;
 784                 ber_bvfree( scred );
 785
 786                 if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 787                         ld->ld_errno = sasl_err2ldap( saslrc );
 788 #if SASL_VERSION_MAJOR >= 2
 789                         ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 790 #endif
 791                         rc = ld->ld_errno;
 792                         goto done;
 793                 }
 794         } while ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 795
 796         if ( rc != LDAP_SUCCESS ) goto done;
 797
 798         if ( saslrc != SASL_OK ) {
 799 #if SASL_VERSION_MAJOR >= 2
 800                 ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 801 #endif
 802                 rc = ld->ld_errno = sasl_err2ldap( saslrc );
 803                 goto done;
 804         }
 805
 806         if( flags != LDAP_SASL_QUIET ) {
 807                 saslrc = sasl_getprop( ctx, SASL_USERNAME, (SASL_CONST void **) &data );
 808                 if( saslrc == SASL_OK && data && *data ) {
 809                         fprintf( stderr, "SASL username: %s\n", data );
 810                 }
 811
 812 #if SASL_VERSION_MAJOR < 2
 813                 saslrc = sasl_getprop( ctx, SASL_REALM, (SASL_CONST void **) &data );
 814                 if( saslrc == SASL_OK && data && *data ) {
 815                         fprintf( stderr, "SASL realm: %s\n", data );
 816                 }
 817 #endif
 818         }
 819
 820         saslrc = sasl_getprop( ctx, SASL_SSF, (SASL_CONST void **) &ssf );
 821         if( saslrc == SASL_OK ) {
 822                 if( flags != LDAP_SASL_QUIET ) {
 823                         fprintf( stderr, "SASL SSF: %lu\n",
 824                                 (unsigned long) *ssf );
 825                 }
 826
 827                 if( ssf && *ssf ) {
 828                         if( flags != LDAP_SASL_QUIET ) {
 829                                 fprintf( stderr, "SASL installing layers\n" );
 830                         }
 831                         if ( ld->ld_defconn->lconn_sasl_sockctx ) {
 832                                 oldctx = ld->ld_defconn->lconn_sasl_sockctx;
 833                                 sasl_dispose( &oldctx );
 834                                 ldap_pvt_sasl_remove( ld->ld_defconn->lconn_sb );
 835                         }
 836                         ldap_pvt_sasl_install( ld->ld_defconn->lconn_sb, ctx );
 837                         ld->ld_defconn->lconn_sasl_sockctx = ctx;
 838                 }
 839         }
 840         ld->ld_defconn->lconn_sasl_authctx = ctx;
 841
 842 done:
 843         return rc;
 844 }
 845
 846 int
 847 ldap_int_sasl_external(
 848         LDAP *ld,
 849         LDAPConn *conn,
 850         const char * authid,
 851         ber_len_t ssf )
 852 {
 853         int sc;
 854         sasl_conn_t *ctx;
 855 #if SASL_VERSION_MAJOR < 2
 856         sasl_external_properties_t extprops;
 857 #endif
 858
 859         ctx = conn->lconn_sasl_authctx;
 860
 861         if ( ctx == NULL ) {
 862                 return LDAP_LOCAL_ERROR;
 863         }
 864
 865 #if SASL_VERSION_MAJOR >= 2
 866         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, &ssf );
 867         if ( sc == SASL_OK )
 868                 sc = sasl_setprop( ctx, SASL_AUTH_EXTERNAL, authid );
 869 #else
 870         memset( &extprops, '\0', sizeof(extprops) );
 871         extprops.ssf = ssf;
 872         extprops.auth_id = (char *) authid;
 873
 874         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
 875                 (void *) &extprops );
 876 #endif
 877
 878         if ( sc != SASL_OK ) {
 879                 return LDAP_LOCAL_ERROR;
 880         }
 881
 882         return LDAP_SUCCESS;
 883 }
 884
 885
 886 int ldap_pvt_sasl_secprops(
 887         const char *in,
 888         sasl_security_properties_t *secprops )
 889 {
 890         int i;
 891         char **props = ldap_str2charray( in, "," );
 892         unsigned sflags = 0;
 893         int got_sflags = 0;
 894         sasl_ssf_t max_ssf = 0;
 895         int got_max_ssf = 0;
 896         sasl_ssf_t min_ssf = 0;
 897         int got_min_ssf = 0;
 898         unsigned maxbufsize = 0;
 899         int got_maxbufsize = 0;
 900
 901         if( props == NULL || secprops == NULL ) {
 902                 return LDAP_PARAM_ERROR;
 903         }
 904
 905         for( i=0; props[i]; i++ ) {
 906                 if( !strcasecmp(props[i], "none") ) {
 907                         got_sflags++;
 908
 909                 } else if( !strcasecmp(props[i], "noplain") ) {
 910                         got_sflags++;
 911                         sflags |= SASL_SEC_NOPLAINTEXT;
 912
 913                 } else if( !strcasecmp(props[i], "noactive") ) {
 914                         got_sflags++;
 915                         sflags |= SASL_SEC_NOACTIVE;
 916
 917                 } else if( !strcasecmp(props[i], "nodict") ) {
 918                         got_sflags++;
 919                         sflags |= SASL_SEC_NODICTIONARY;
 920
 921                 } else if( !strcasecmp(props[i], "forwardsec") ) {
 922                         got_sflags++;
 923                         sflags |= SASL_SEC_FORWARD_SECRECY;
 924
 925                 } else if( !strcasecmp(props[i], "noanonymous")) {
 926                         got_sflags++;
 927                         sflags |= SASL_SEC_NOANONYMOUS;
 928
 929                 } else if( !strcasecmp(props[i], "passcred") ) {
 930                         got_sflags++;
 931                         sflags |= SASL_SEC_PASS_CREDENTIALS;
 932
 933                 } else if( !strncasecmp(props[i],
 934                         "minssf=", sizeof("minssf")) )
 935                 {
 936                         if( isdigit( (unsigned char) props[i][sizeof("minssf")] ) ) {
 937                                 got_min_ssf++;
 938                                 min_ssf = atoi( &props[i][sizeof("minssf")] );
 939                         } else {
 940                                 return LDAP_NOT_SUPPORTED;
 941                         }
 942
 943                 } else if( !strncasecmp(props[i],
 944                         "maxssf=", sizeof("maxssf")) )
 945                 {
 946                         if( isdigit( (unsigned char) props[i][sizeof("maxssf")] ) ) {
 947                                 got_max_ssf++;
 948                                 max_ssf = atoi( &props[i][sizeof("maxssf")] );
 949                         } else {
 950                                 return LDAP_NOT_SUPPORTED;
 951                         }
 952
 953                 } else if( !strncasecmp(props[i],
 954                         "maxbufsize=", sizeof("maxbufsize")) )
 955                 {
 956                         if( isdigit( (unsigned char) props[i][sizeof("maxbufsize")] ) ) {
 957                                 got_maxbufsize++;
 958                                 maxbufsize = atoi( &props[i][sizeof("maxbufsize")] );
 959                         } else {
 960                                 return LDAP_NOT_SUPPORTED;
 961                         }
 962
 963                         if( maxbufsize && (( maxbufsize < SASL_MIN_BUFF_SIZE )
 964                                 || (maxbufsize > SASL_MAX_BUFF_SIZE )))
 965                         {
 966                                 /* bad maxbufsize */
 967                                 return LDAP_PARAM_ERROR;
 968                         }
 969
 970                 } else {
 971                         return LDAP_NOT_SUPPORTED;
 972                 }
 973         }
 974
 975         if(got_sflags) {
 976                 secprops->security_flags = sflags;
 977         }
 978         if(got_min_ssf) {
 979                 secprops->min_ssf = min_ssf;
 980         }
 981         if(got_max_ssf) {
 982                 secprops->max_ssf = max_ssf;
 983         }
 984         if(got_maxbufsize) {
 985                 secprops->maxbufsize = maxbufsize;
 986         }
 987
 988         ldap_charray_free( props );
 989         return LDAP_SUCCESS;
 990 }
 991
 992 int
 993 ldap_int_sasl_config( struct ldapoptions *lo, int option, const char *arg )
 994 {
 995         int rc;
 996
 997         switch( option ) {
 998         case LDAP_OPT_X_SASL_SECPROPS:
 999                 rc = ldap_pvt_sasl_secprops( arg, &lo->ldo_sasl_secprops );
1000                 if( rc == LDAP_SUCCESS ) return 0;
1001         }
1002
1003         return -1;
1004 }
1005
1006 int
1007 ldap_int_sasl_get_option( LDAP *ld, int option, void *arg )
1008 {
1009         if ( ld == NULL )
1010                 return -1;
1011
1012         switch ( option ) {
1013                 case LDAP_OPT_X_SASL_MECH: {
1014                         *(char **)arg = ld->ld_options.ldo_def_sasl_mech
1015                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_mech ) : NULL;
1016                 } break;
1017                 case LDAP_OPT_X_SASL_REALM: {
1018                         *(char **)arg = ld->ld_options.ldo_def_sasl_realm
1019                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_realm ) : NULL;
1020                 } break;
1021                 case LDAP_OPT_X_SASL_AUTHCID: {
1022                         *(char **)arg = ld->ld_options.ldo_def_sasl_authcid
1023                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_authcid ) : NULL;
1024                 } break;
1025                 case LDAP_OPT_X_SASL_AUTHZID: {
1026                         *(char **)arg = ld->ld_options.ldo_def_sasl_authzid
1027                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_authzid ) : NULL;
1028                 } break;
1029
1030                 case LDAP_OPT_X_SASL_SSF: {
1031                         int sc;
1032                         sasl_ssf_t      *ssf;
1033                         sasl_conn_t *ctx;
1034
1035                         if( ld->ld_defconn == NULL ) {
1036                                 return -1;
1037                         }
1038
1039                         ctx = ld->ld_defconn->lconn_sasl_sockctx;
1040
1041                         if ( ctx == NULL ) {
1042                                 return -1;
1043                         }
1044
1045                         sc = sasl_getprop( ctx, SASL_SSF,
1046                                 (SASL_CONST void **) &ssf );
1047
1048                         if ( sc != SASL_OK ) {
1049                                 return -1;
1050                         }
1051
1052                         *(ber_len_t *)arg = *ssf;
1053                 } break;
1054
1055                 case LDAP_OPT_X_SASL_SSF_EXTERNAL:
1056                         /* this option is write only */
1057                         return -1;
1058
1059                 case LDAP_OPT_X_SASL_SSF_MIN:
1060                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.min_ssf;
1061                         break;
1062                 case LDAP_OPT_X_SASL_SSF_MAX:
1063                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.max_ssf;
1064                         break;
1065                 case LDAP_OPT_X_SASL_MAXBUFSIZE:
1066                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.maxbufsize;
1067                         break;
1068
1069                 case LDAP_OPT_X_SASL_SECPROPS:
1070                         /* this option is write only */
1071                         return -1;
1072
1073                 default:
1074                         return -1;
1075         }
1076         return 0;
1077 }
1078
1079 int
1080 ldap_int_sasl_set_option( LDAP *ld, int option, void *arg )
1081 {
1082         if ( ld == NULL )
1083                 return -1;
1084
1085         switch ( option ) {
1086         case LDAP_OPT_X_SASL_SSF:
1087                 /* This option is read-only */
1088                 return -1;
1089
1090         case LDAP_OPT_X_SASL_SSF_EXTERNAL: {
1091                 int sc;
1092 #if SASL_VERSION_MAJOR < 2
1093                 sasl_external_properties_t extprops;
1094 #endif
1095                 sasl_conn_t *ctx;
1096
1097                 if( ld->ld_defconn == NULL ) {
1098                         return -1;
1099                 }
1100
1101                 ctx = ld->ld_defconn->lconn_sasl_authctx;
1102
1103                 if ( ctx == NULL ) {
1104                         return -1;
1105                 }
1106
1107 #if SASL_VERSION_MAJOR >= 2
1108                 sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, arg);
1109 #else
1110                 memset(&extprops, 0L, sizeof(extprops));
1111
1112                 extprops.ssf = * (ber_len_t *) arg;
1113
1114                 sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
1115                         (void *) &extprops );
1116 #endif
1117
1118                 if ( sc != SASL_OK ) {
1119                         return -1;
1120                 }
1121                 } break;
1122
1123         case LDAP_OPT_X_SASL_SSF_MIN:
1124                 ld->ld_options.ldo_sasl_secprops.min_ssf = *(ber_len_t *)arg;
1125                 break;
1126         case LDAP_OPT_X_SASL_SSF_MAX:
1127                 ld->ld_options.ldo_sasl_secprops.max_ssf = *(ber_len_t *)arg;
1128                 break;
1129         case LDAP_OPT_X_SASL_MAXBUFSIZE:
1130                 ld->ld_options.ldo_sasl_secprops.maxbufsize = *(ber_len_t *)arg;
1131                 break;
1132
1133         case LDAP_OPT_X_SASL_SECPROPS: {
1134                 int sc;
1135                 sc = ldap_pvt_sasl_secprops( (char *) arg,
1136                         &ld->ld_options.ldo_sasl_secprops );
1137
1138                 return sc == LDAP_SUCCESS ? 0 : -1;
1139                 }
1140
1141         default:
1142                 return -1;
1143         }
1144         return 0;
1145 }
1146
1147 #ifdef LDAP_R_COMPILE
1148 #define LDAP_DEBUG_R_SASL
1149 void *ldap_pvt_sasl_mutex_new(void)
1150 {
1151         ldap_pvt_thread_mutex_t *mutex;
1152
1153         mutex = (ldap_pvt_thread_mutex_t *) LDAP_MALLOC(
1154                 sizeof(ldap_pvt_thread_mutex_t) );
1155
1156         if ( ldap_pvt_thread_mutex_init( mutex ) == 0 ) {
1157                 return mutex;
1158         }
1159 #ifndef LDAP_DEBUG_R_SASL
1160         assert( 0 );
1161 #endif /* !LDAP_DEBUG_R_SASL */
1162         return NULL;
1163 }
1164
1165 int ldap_pvt_sasl_mutex_lock(void *mutex)
1166 {
1167 #ifdef LDAP_DEBUG_R_SASL
1168         if ( mutex == NULL ) {
1169                 return SASL_OK;
1170         }
1171 #else /* !LDAP_DEBUG_R_SASL */
1172         assert( mutex );
1173 #endif /* !LDAP_DEBUG_R_SASL */
1174         return ldap_pvt_thread_mutex_lock( (ldap_pvt_thread_mutex_t *)mutex )
1175                 ? SASL_FAIL : SASL_OK;
1176 }
1177
1178 int ldap_pvt_sasl_mutex_unlock(void *mutex)
1179 {
1180 #ifdef LDAP_DEBUG_R_SASL
1181         if ( mutex == NULL ) {
1182                 return SASL_OK;
1183         }
1184 #else /* !LDAP_DEBUG_R_SASL */
1185         assert( mutex );
1186 #endif /* !LDAP_DEBUG_R_SASL */
1187         return ldap_pvt_thread_mutex_unlock( (ldap_pvt_thread_mutex_t *)mutex )
1188                 ? SASL_FAIL : SASL_OK;
1189 }
1190
1191 void ldap_pvt_sasl_mutex_dispose(void *mutex)
1192 {
1193 #ifdef LDAP_DEBUG_R_SASL
1194         if ( mutex == NULL ) {
1195                 return;
1196         }
1197 #else /* !LDAP_DEBUG_R_SASL */
1198         assert( mutex );
1199 #endif /* !LDAP_DEBUG_R_SASL */
1200         (void) ldap_pvt_thread_mutex_destroy( (ldap_pvt_thread_mutex_t *)mutex );
1201         LDAP_FREE( mutex );
1202 }
1203 #endif
1204
1205 #else
1206 int ldap_int_sasl_init( void )
1207 { return LDAP_SUCCESS; }
1208
1209 int ldap_int_sasl_close( LDAP *ld, LDAPConn *lc )
1210 { return LDAP_SUCCESS; }
1211
1212 int
1213 ldap_int_sasl_bind(
1214         LDAP                    *ld,
1215         const char              *dn,
1216         const char              *mechs,
1217         LDAPControl             **sctrls,
1218         LDAPControl             **cctrls,
1219         unsigned                flags,
1220         LDAP_SASL_INTERACT_PROC *interact,
1221         void * defaults )
1222 { return LDAP_NOT_SUPPORTED; }
1223
1224 int
1225 ldap_int_sasl_external(
1226         LDAP *ld,
1227         LDAPConn *conn,
1228         const char * authid,
1229         ber_len_t ssf )
1230 { return LDAP_SUCCESS; }
1231
1232 #endif /* HAVE_CYRUS_SASL */