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