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

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1998-2004 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15
  16 #include "portable.h"
  17
  18 #include <stdio.h>
  19
  20 #include <ac/socket.h>
  21 #include <ac/stdlib.h>
  22 #include <ac/string.h>
  23 #include <ac/time.h>
  24 #include <ac/errno.h>
  25 #include <ac/ctype.h>
  26 #include <ac/unistd.h>
  27
  28 #include "ldap-int.h"
  29
  30 #ifdef HAVE_CYRUS_SASL
  31
  32 #ifdef LDAP_R_COMPILE
  33 ldap_pvt_thread_mutex_t ldap_int_sasl_mutex;
  34 #endif
  35
  36 #ifdef HAVE_SASL_SASL_H
  37 #include <sasl/sasl.h>
  38 #else
  39 #include <sasl.h>
  40 #endif
  41
  42 #if SASL_VERSION_MAJOR >= 2
  43 #define SASL_CONST const
  44 #else
  45 #define SASL_CONST
  46 #endif
  47
  48 /*
  49 * Various Cyrus SASL related stuff.
  50 */
  51
  52 static const sasl_callback_t client_callbacks[] = {
  53 #ifdef SASL_CB_GETREALM
  54         { SASL_CB_GETREALM, NULL, NULL },
  55 #endif
  56         { SASL_CB_USER, NULL, NULL },
  57         { SASL_CB_AUTHNAME, NULL, NULL },
  58         { SASL_CB_PASS, NULL, NULL },
  59         { SASL_CB_ECHOPROMPT, NULL, NULL },
  60         { SASL_CB_NOECHOPROMPT, NULL, NULL },
  61         { SASL_CB_LIST_END, NULL, NULL }
  62 };
  63
  64 int ldap_int_sasl_init( void )
  65 {
  66         /* XXX not threadsafe */
  67         static int sasl_initialized = 0;
  68
  69 #ifdef HAVE_SASL_VERSION
  70         /* stringify the version number, sasl.h doesn't do it for us */
  71 #define VSTR0(maj, min, pat)    #maj "." #min "." #pat
  72 #define VSTR(maj, min, pat)     VSTR0(maj, min, pat)
  73 #define SASL_VERSION_STRING     VSTR(SASL_VERSION_MAJOR, SASL_VERSION_MINOR, \
  74                                 SASL_VERSION_STEP)
  75         { int rc;
  76         sasl_version( NULL, &rc );
  77         if ( ((rc >> 16) != ((SASL_VERSION_MAJOR << 8)|SASL_VERSION_MINOR)) ||
  78                 (rc & 0xffff) < SASL_VERSION_STEP) {
  79                 char version[sizeof("xxx.xxx.xxxxx")];
  80                 sprintf( version, "%u.%d.%d", (unsigned)rc >> 24, (rc >> 16) & 0xff,
  81                         rc & 0xffff );
  82
  83 #ifdef NEW_LOGGING
  84                 LDAP_LOG( TRANSPORT, INFO,
  85                 "ldap_int_sasl_init: SASL library version mismatch:"
  86                 " expected " SASL_VERSION_STRING ","
  87                 " got %s\n", version, 0, 0 );
  88 #else
  89                 Debug( LDAP_DEBUG_ANY,
  90                 "ldap_int_sasl_init: SASL library version mismatch:"
  91                 " expected " SASL_VERSION_STRING ","
  92                 " got %s\n", version, 0, 0 );
  93 #endif
  94                 return -1;
  95         }
  96         }
  97 #endif
  98         if ( sasl_initialized ) {
  99                 return 0;
 100         }
 101
 102 /* SASL 2 takes care of its own memory completely internally */
 103 #if SASL_VERSION_MAJOR < 2 && !defined(CSRIMALLOC)
 104         sasl_set_alloc(
 105                 ber_memalloc,
 106                 ber_memcalloc,
 107                 ber_memrealloc,
 108                 ber_memfree );
 109 #endif /* CSRIMALLOC */
 110
 111 #ifdef LDAP_R_COMPILE
 112         sasl_set_mutex(
 113                 ldap_pvt_sasl_mutex_new,
 114                 ldap_pvt_sasl_mutex_lock,
 115                 ldap_pvt_sasl_mutex_unlock,
 116                 ldap_pvt_sasl_mutex_dispose );
 117 #endif
 118
 119         if ( sasl_client_init( NULL ) == SASL_OK ) {
 120                 sasl_initialized = 1;
 121                 return 0;
 122         }
 123
 124 #if SASL_VERSION_MAJOR < 2
 125         /* A no-op to make sure we link with Cyrus 1.5 */
 126         sasl_client_auth( NULL, NULL, NULL, 0, NULL, NULL );
 127 #endif
 128         return -1;
 129 }
 130
 131 /*
 132  * SASL encryption support for LBER Sockbufs
 133  */
 134
 135 struct sb_sasl_data {
 136         sasl_conn_t             *sasl_context;
 137         unsigned                *sasl_maxbuf;
 138         Sockbuf_Buf             sec_buf_in;
 139         Sockbuf_Buf             buf_in;
 140         Sockbuf_Buf             buf_out;
 141 };
 142
 143 static int
 144 sb_sasl_setup( Sockbuf_IO_Desc *sbiod, void *arg )
 145 {
 146         struct sb_sasl_data     *p;
 147
 148         assert( sbiod != NULL );
 149
 150         p = LBER_MALLOC( sizeof( *p ) );
 151         if ( p == NULL )
 152                 return -1;
 153         p->sasl_context = (sasl_conn_t *)arg;
 154         ber_pvt_sb_buf_init( &p->sec_buf_in );
 155         ber_pvt_sb_buf_init( &p->buf_in );
 156         ber_pvt_sb_buf_init( &p->buf_out );
 157         if ( ber_pvt_sb_grow_buffer( &p->sec_buf_in, SASL_MIN_BUFF_SIZE ) < 0 ) {
 158                 LBER_FREE( p );
 159                 errno = ENOMEM;
 160                 return -1;
 161         }
 162         sasl_getprop( p->sasl_context, SASL_MAXOUTBUF,
 163                 (SASL_CONST void **) &p->sasl_maxbuf );
 164
 165         sbiod->sbiod_pvt = p;
 166
 167         return 0;
 168 }
 169
 170 static int
 171 sb_sasl_remove( Sockbuf_IO_Desc *sbiod )
 172 {
 173         struct sb_sasl_data     *p;
 174
 175         assert( sbiod != NULL );
 176
 177         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 178 #if SASL_VERSION_MAJOR >= 2
 179         /*
 180          * SASLv2 encode/decode buffers are managed by
 181          * libsasl2. Ensure they are not freed by liblber.
 182          */
 183         p->buf_in.buf_base = NULL;
 184         p->buf_out.buf_base = NULL;
 185 #endif
 186         ber_pvt_sb_buf_destroy( &p->sec_buf_in );
 187         ber_pvt_sb_buf_destroy( &p->buf_in );
 188         ber_pvt_sb_buf_destroy( &p->buf_out );
 189         LBER_FREE( p );
 190         sbiod->sbiod_pvt = NULL;
 191         return 0;
 192 }
 193
 194 static ber_len_t
 195 sb_sasl_pkt_length( const unsigned char *buf, int debuglevel )
 196 {
 197         ber_len_t               size;
 198
 199         assert( buf != NULL );
 200
 201         size = buf[0] << 24
 202                 | buf[1] << 16
 203                 | buf[2] << 8
 204                 | buf[3];
 205
 206         if ( size > SASL_MAX_BUFF_SIZE ) {
 207                 /* somebody is trying to mess me up. */
 208                 ber_log_printf( LDAP_DEBUG_ANY, debuglevel,
 209                         "sb_sasl_pkt_length: received illegal packet length "
 210                         "of %lu bytes\n", (unsigned long)size );
 211                 size = 16; /* this should lead to an error. */
 212         }
 213
 214         return size + 4; /* include the size !!! */
 215 }
 216
 217 /* Drop a processed packet from the input buffer */
 218 static void
 219 sb_sasl_drop_packet ( Sockbuf_Buf *sec_buf_in, int debuglevel )
 220 {
 221         ber_slen_t                      len;
 222
 223         len = sec_buf_in->buf_ptr - sec_buf_in->buf_end;
 224         if ( len > 0 )
 225                 AC_MEMCPY( sec_buf_in->buf_base, sec_buf_in->buf_base +
 226                         sec_buf_in->buf_end, len );
 227
 228         if ( len >= 4 ) {
 229                 sec_buf_in->buf_end = sb_sasl_pkt_length(
 230                         (unsigned char *) sec_buf_in->buf_base, debuglevel);
 231         }
 232         else {
 233                 sec_buf_in->buf_end = 0;
 234         }
 235         sec_buf_in->buf_ptr = len;
 236 }
 237
 238 static ber_slen_t
 239 sb_sasl_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
 240 {
 241         struct sb_sasl_data     *p;
 242         ber_slen_t              ret, bufptr;
 243
 244         assert( sbiod != NULL );
 245         assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
 246
 247         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 248
 249         /* Are there anything left in the buffer? */
 250         ret = ber_pvt_sb_copy_out( &p->buf_in, buf, len );
 251         bufptr = ret;
 252         len -= ret;
 253
 254         if ( len == 0 )
 255                 return bufptr;
 256
 257 #if SASL_VERSION_MAJOR >= 2
 258         ber_pvt_sb_buf_init( &p->buf_in );
 259 #else
 260         ber_pvt_sb_buf_destroy( &p->buf_in );
 261 #endif
 262
 263         /* Read the length of the packet */
 264         while ( p->sec_buf_in.buf_ptr < 4 ) {
 265                 ret = LBER_SBIOD_READ_NEXT( sbiod, p->sec_buf_in.buf_base +
 266                         p->sec_buf_in.buf_ptr,
 267                         4 - p->sec_buf_in.buf_ptr );
 268 #ifdef EINTR
 269                 if ( ( ret < 0 ) && ( errno == EINTR ) )
 270                         continue;
 271 #endif
 272                 if ( ret <= 0 )
 273                         return bufptr ? bufptr : ret;
 274
 275                 p->sec_buf_in.buf_ptr += ret;
 276         }
 277
 278         /* The new packet always starts at p->sec_buf_in.buf_base */
 279         ret = sb_sasl_pkt_length( (unsigned char *) p->sec_buf_in.buf_base,
 280                 sbiod->sbiod_sb->sb_debug );
 281
 282         /* Grow the packet buffer if neccessary */
 283         if ( ( p->sec_buf_in.buf_size < (ber_len_t) ret ) &&
 284                 ber_pvt_sb_grow_buffer( &p->sec_buf_in, ret ) < 0 )
 285         {
 286                 errno = ENOMEM;
 287                 return -1;
 288         }
 289         p->sec_buf_in.buf_end = ret;
 290
 291         /* Did we read the whole encrypted packet? */
 292         while ( p->sec_buf_in.buf_ptr < p->sec_buf_in.buf_end ) {
 293                 /* No, we have got only a part of it */
 294                 ret = p->sec_buf_in.buf_end - p->sec_buf_in.buf_ptr;
 295
 296                 ret = LBER_SBIOD_READ_NEXT( sbiod, p->sec_buf_in.buf_base +
 297                         p->sec_buf_in.buf_ptr, ret );
 298 #ifdef EINTR
 299                 if ( ( ret < 0 ) && ( errno == EINTR ) )
 300                         continue;
 301 #endif
 302                 if ( ret <= 0 )
 303                         return bufptr ? bufptr : ret;
 304
 305                 p->sec_buf_in.buf_ptr += ret;
 306         }
 307
 308         /* Decode the packet */
 309         {
 310                 unsigned tmpsize = p->buf_in.buf_end;
 311                 ret = sasl_decode( p->sasl_context, p->sec_buf_in.buf_base,
 312                         p->sec_buf_in.buf_end,
 313                         (SASL_CONST char **)&p->buf_in.buf_base,
 314                         (unsigned *)&tmpsize );
 315                 p->buf_in.buf_end = tmpsize;
 316         }
 317
 318         /* Drop the packet from the input buffer */
 319         sb_sasl_drop_packet( &p->sec_buf_in, sbiod->sbiod_sb->sb_debug );
 320
 321         if ( ret != SASL_OK ) {
 322                 ber_log_printf( LDAP_DEBUG_ANY, sbiod->sbiod_sb->sb_debug,
 323                         "sb_sasl_read: failed to decode packet: %s\n",
 324                         sasl_errstring( ret, NULL, NULL ) );
 325                 errno = EIO;
 326                 return -1;
 327         }
 328
 329         p->buf_in.buf_size = p->buf_in.buf_end;
 330
 331         bufptr += ber_pvt_sb_copy_out( &p->buf_in, (char*) buf + bufptr, len );
 332
 333         return bufptr;
 334 }
 335
 336 static ber_slen_t
 337 sb_sasl_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
 338 {
 339         struct sb_sasl_data     *p;
 340         int                     ret;
 341
 342         assert( sbiod != NULL );
 343         assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
 344
 345         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 346
 347         /* Are there anything left in the buffer? */
 348         if ( p->buf_out.buf_ptr != p->buf_out.buf_end ) {
 349                 ret = ber_pvt_sb_do_write( sbiod, &p->buf_out );
 350                 if ( ret < 0 )
 351                         return ret;
 352                 /* Still have something left?? */
 353                 if ( p->buf_out.buf_ptr != p->buf_out.buf_end ) {
 354                         errno = EAGAIN;
 355                         return 0;
 356                 }
 357         }
 358
 359         /* now encode the next packet. */
 360 #if SASL_VERSION_MAJOR >= 2
 361         ber_pvt_sb_buf_init( &p->buf_out );
 362 #else
 363         ber_pvt_sb_buf_destroy( &p->buf_out );
 364 #endif
 365         if ( len > *p->sasl_maxbuf - 100 ) {
 366                 len = *p->sasl_maxbuf - 100;    /* For safety margin */
 367         }
 368
 369         {
 370                 unsigned tmpsize = p->buf_out.buf_size;
 371                 ret = sasl_encode( p->sasl_context, buf, len,
 372                         (SASL_CONST char **)&p->buf_out.buf_base,
 373                         &tmpsize );
 374                 p->buf_out.buf_size = tmpsize;
 375         }
 376
 377         if ( ret != SASL_OK ) {
 378                 ber_log_printf( LDAP_DEBUG_ANY, sbiod->sbiod_sb->sb_debug,
 379                         "sb_sasl_write: failed to encode packet: %s\n",
 380                         sasl_errstring( ret, NULL, NULL ) );
 381                 return -1;
 382         }
 383         p->buf_out.buf_end = p->buf_out.buf_size;
 384
 385         ret = ber_pvt_sb_do_write( sbiod, &p->buf_out );
 386         if ( ret <= 0 ) {
 387                 return ret;
 388         }
 389         return len;
 390 }
 391
 392 static int
 393 sb_sasl_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
 394 {
 395         struct sb_sasl_data     *p;
 396
 397         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 398
 399         if ( opt == LBER_SB_OPT_DATA_READY ) {
 400                 if ( p->buf_in.buf_ptr != p->buf_in.buf_end )
 401                         return 1;
 402         }
 403
 404         return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
 405 }
 406
 407 Sockbuf_IO ldap_pvt_sockbuf_io_sasl = {
 408         sb_sasl_setup,          /* sbi_setup */
 409         sb_sasl_remove,         /* sbi_remove */
 410         sb_sasl_ctrl,           /* sbi_ctrl */
 411         sb_sasl_read,           /* sbi_read */
 412         sb_sasl_write,          /* sbi_write */
 413         NULL                    /* sbi_close */
 414 };
 415
 416 int ldap_pvt_sasl_install( Sockbuf *sb, void *ctx_arg )
 417 {
 418 #ifdef NEW_LOGGING
 419         LDAP_LOG ( TRANSPORT, ENTRY, "ldap_pvt_sasl_install\n", 0, 0, 0 );
 420 #else
 421         Debug( LDAP_DEBUG_TRACE, "ldap_pvt_sasl_install\n",
 422                 0, 0, 0 );
 423 #endif
 424
 425         /* don't install the stuff unless security has been negotiated */
 426
 427         if ( !ber_sockbuf_ctrl( sb, LBER_SB_OPT_HAS_IO,
 428                         &ldap_pvt_sockbuf_io_sasl ) )
 429         {
 430 #ifdef LDAP_DEBUG
 431                 ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
 432                         LBER_SBIOD_LEVEL_APPLICATION, (void *)"sasl_" );
 433 #endif
 434                 ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_sasl,
 435                         LBER_SBIOD_LEVEL_APPLICATION, ctx_arg );
 436         }
 437
 438         return LDAP_SUCCESS;
 439 }
 440
 441 void ldap_pvt_sasl_remove( Sockbuf *sb )
 442 {
 443         ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_sasl,
 444                 LBER_SBIOD_LEVEL_APPLICATION );
 445 #ifdef LDAP_DEBUG
 446         ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
 447                 LBER_SBIOD_LEVEL_APPLICATION );
 448 #endif
 449 }
 450
 451 static int
 452 sasl_err2ldap( int saslerr )
 453 {
 454         int rc;
 455
 456         switch (saslerr) {
 457                 case SASL_CONTINUE:
 458                         rc = LDAP_MORE_RESULTS_TO_RETURN;
 459                         break;
 460                 case SASL_INTERACT:
 461                         rc = LDAP_LOCAL_ERROR;
 462                         break;
 463                 case SASL_OK:
 464                         rc = LDAP_SUCCESS;
 465                         break;
 466                 case SASL_FAIL:
 467                         rc = LDAP_LOCAL_ERROR;
 468                         break;
 469                 case SASL_NOMEM:
 470                         rc = LDAP_NO_MEMORY;
 471                         break;
 472                 case SASL_NOMECH:
 473                         rc = LDAP_AUTH_UNKNOWN;
 474                         break;
 475                 case SASL_BADAUTH:
 476                         rc = LDAP_AUTH_UNKNOWN;
 477                         break;
 478                 case SASL_NOAUTHZ:
 479                         rc = LDAP_PARAM_ERROR;
 480                         break;
 481                 case SASL_TOOWEAK:
 482                 case SASL_ENCRYPT:
 483                         rc = LDAP_AUTH_UNKNOWN;
 484                         break;
 485                 default:
 486                         rc = LDAP_LOCAL_ERROR;
 487                         break;
 488         }
 489
 490         assert( rc == LDAP_SUCCESS || LDAP_API_ERROR( rc ) );
 491         return rc;
 492 }
 493
 494 int
 495 ldap_int_sasl_open(
 496         LDAP *ld,
 497         LDAPConn *lc,
 498         const char * host )
 499 {
 500         int rc;
 501         sasl_conn_t *ctx;
 502
 503         assert( lc->lconn_sasl_authctx == NULL );
 504
 505         if ( host == NULL ) {
 506                 ld->ld_errno = LDAP_LOCAL_ERROR;
 507                 return ld->ld_errno;
 508         }
 509
 510         if ( ldap_int_sasl_init() ) {
 511                 ld->ld_errno = LDAP_LOCAL_ERROR;
 512                 return ld->ld_errno;
 513         }
 514
 515 #if SASL_VERSION_MAJOR >= 2
 516         rc = sasl_client_new( "ldap", host, NULL, NULL,
 517                 client_callbacks, 0, &ctx );
 518 #else
 519         rc = sasl_client_new( "ldap", host, client_callbacks,
 520                 SASL_SECURITY_LAYER, &ctx );
 521 #endif
 522
 523         if ( rc != SASL_OK ) {
 524                 ld->ld_errno = sasl_err2ldap( rc );
 525                 return ld->ld_errno;
 526         }
 527
 528 #ifdef NEW_LOGGING
 529         LDAP_LOG ( TRANSPORT, DETAIL1, "ldap_int_sasl_open: host=%s\n",
 530                 host, 0, 0 );
 531 #else
 532         Debug( LDAP_DEBUG_TRACE, "ldap_int_sasl_open: host=%s\n",
 533                 host, 0, 0 );
 534 #endif
 535
 536         lc->lconn_sasl_authctx = ctx;
 537
 538         return LDAP_SUCCESS;
 539 }
 540
 541 int ldap_int_sasl_close( LDAP *ld, LDAPConn *lc )
 542 {
 543         sasl_conn_t *ctx = lc->lconn_sasl_authctx;
 544
 545         if( ctx != NULL ) {
 546                 sasl_dispose( &ctx );
 547                 if ( lc->lconn_sasl_sockctx &&
 548                         lc->lconn_sasl_authctx != lc->lconn_sasl_sockctx ) {
 549                         ctx = lc->lconn_sasl_sockctx;
 550                         sasl_dispose( &ctx );
 551                 }
 552                 lc->lconn_sasl_sockctx = NULL;
 553                 lc->lconn_sasl_authctx = NULL;
 554         }
 555
 556         return LDAP_SUCCESS;
 557 }
 558
 559 int
 560 ldap_int_sasl_bind(
 561         LDAP                    *ld,
 562         const char              *dn,
 563         const char              *mechs,
 564         LDAPControl             **sctrls,
 565         LDAPControl             **cctrls,
 566         unsigned                flags,
 567         LDAP_SASL_INTERACT_PROC *interact,
 568         void * defaults )
 569 {
 570         char *data;
 571         const char *mech = NULL;
 572         const char *pmech = NULL;
 573         int                     saslrc, rc;
 574         sasl_ssf_t              *ssf = NULL;
 575         sasl_conn_t     *ctx, *oldctx = NULL;
 576         sasl_interact_t *prompts = NULL;
 577         unsigned credlen;
 578         struct berval ccred;
 579         ber_socket_t            sd;
 580         void    *ssl;
 581
 582 #ifdef NEW_LOGGING
 583         LDAP_LOG ( TRANSPORT, ARGS, "ldap_int_sasl_bind: %s\n",
 584                 mechs ? mechs : "<null>", 0, 0 );
 585 #else
 586         Debug( LDAP_DEBUG_TRACE, "ldap_int_sasl_bind: %s\n",
 587                 mechs ? mechs : "<null>", 0, 0 );
 588 #endif
 589
 590         /* do a quick !LDAPv3 check... ldap_sasl_bind will do the rest. */
 591         if (ld->ld_version < LDAP_VERSION3) {
 592                 ld->ld_errno = LDAP_NOT_SUPPORTED;
 593                 return ld->ld_errno;
 594         }
 595
 596         ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, &sd );
 597
 598         if ( sd == AC_SOCKET_INVALID ) {
 599                 /* not connected yet */
 600                 int rc;
 601
 602                 rc = ldap_open_defconn( ld );
 603                 if( rc < 0 ) return ld->ld_errno;
 604
 605                 ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, &sd );
 606
 607                 if( sd == AC_SOCKET_INVALID ) {
 608                         ld->ld_errno = LDAP_LOCAL_ERROR;
 609                         return ld->ld_errno;
 610                 }
 611         }
 612
 613         oldctx = ld->ld_defconn->lconn_sasl_authctx;
 614
 615         /* If we already have an authentication context, clear it out */
 616         if( oldctx ) {
 617                 if ( oldctx != ld->ld_defconn->lconn_sasl_sockctx ) {
 618                         sasl_dispose( &oldctx );
 619                 }
 620                 ld->ld_defconn->lconn_sasl_authctx = NULL;
 621         }
 622
 623         { char *saslhost = ldap_host_connected_to( ld->ld_sb, "localhost" );
 624         rc = ldap_int_sasl_open( ld, ld->ld_defconn, saslhost );
 625         LDAP_FREE( saslhost );
 626         }
 627
 628         if ( rc != LDAP_SUCCESS ) return rc;
 629
 630         ctx = ld->ld_defconn->lconn_sasl_authctx;
 631
 632         /* Check for TLS */
 633         ssl = ldap_pvt_tls_sb_ctx( ld->ld_sb );
 634         if ( ssl ) {
 635                 struct berval authid = BER_BVNULL;
 636                 ber_len_t fac;
 637
 638                 fac = ldap_pvt_tls_get_strength( ssl );
 639                 /* failure is OK, we just can't use SASL EXTERNAL */
 640                 (void) ldap_pvt_tls_get_my_dn( ssl, &authid, NULL, 0 );
 641
 642                 (void) ldap_int_sasl_external( ld, ld->ld_defconn, authid.bv_val, fac );
 643                 LDAP_FREE( authid.bv_val );
 644         }
 645
 646 #if !defined(_WIN32)
 647         /* Check for local */
 648         if ( ldap_pvt_url_scheme2proto( ld->ld_defconn->lconn_server->lud_scheme ) == LDAP_PROTO_IPC ) {
 649                 char authid[sizeof("uidNumber=4294967295+gidNumber=4294967295,"
 650                         "cn=peercred,cn=external,cn=auth")];
 651                 sprintf( authid, "uidNumber=%d+gidNumber=%d,"
 652                         "cn=peercred,cn=external,cn=auth",
 653                         (int) geteuid(), (int) getegid() );
 654                 (void) ldap_int_sasl_external( ld, ld->ld_defconn, authid, LDAP_PVT_SASL_LOCAL_SSF );
 655         }
 656 #endif
 657
 658         /* (re)set security properties */
 659         sasl_setprop( ctx, SASL_SEC_PROPS,
 660                 &ld->ld_options.ldo_sasl_secprops );
 661
 662         ccred.bv_val = NULL;
 663         ccred.bv_len = 0;
 664
 665         do {
 666                 saslrc = sasl_client_start( ctx,
 667                         mechs,
 668 #if SASL_VERSION_MAJOR < 2
 669                         NULL,
 670 #endif
 671                         &prompts,
 672                         (SASL_CONST char **)&ccred.bv_val,
 673                         &credlen,
 674                         &mech );
 675
 676                 if( pmech == NULL && mech != NULL ) {
 677                         pmech = mech;
 678
 679                         if( flags != LDAP_SASL_QUIET ) {
 680                                 fprintf(stderr,
 681                                         "SASL/%s authentication started\n",
 682                                         pmech );
 683                         }
 684                 }
 685
 686                 if( saslrc == SASL_INTERACT ) {
 687                         int res;
 688                         if( !interact ) break;
 689                         res = (interact)( ld, flags, defaults, prompts );
 690
 691                         if( res != LDAP_SUCCESS ) break;
 692                 }
 693         } while ( saslrc == SASL_INTERACT );
 694
 695         ccred.bv_len = credlen;
 696
 697         if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 698                 rc = ld->ld_errno = sasl_err2ldap( saslrc );
 699 #if SASL_VERSION_MAJOR >= 2
 700                 ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 701 #endif
 702                 goto done;
 703         }
 704
 705         do {
 706                 struct berval *scred;
 707                 unsigned credlen;
 708
 709                 scred = NULL;
 710
 711                 rc = ldap_sasl_bind_s( ld, dn, mech, &ccred, sctrls, cctrls, &scred );
 712
 713                 if ( ccred.bv_val != NULL ) {
 714 #if SASL_VERSION_MAJOR < 2
 715                         LDAP_FREE( ccred.bv_val );
 716 #endif
 717                         ccred.bv_val = NULL;
 718                 }
 719
 720                 if ( rc != LDAP_SUCCESS && rc != LDAP_SASL_BIND_IN_PROGRESS ) {
 721                         if( scred && scred->bv_len ) {
 722                                 /* and server provided us with data? */
 723 #ifdef NEW_LOGGING
 724                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 725                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 726                                         rc, saslrc, scred->bv_len );
 727 #else
 728                                 Debug( LDAP_DEBUG_TRACE,
 729                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 730                                         rc, saslrc, scred->bv_len );
 731 #endif
 732                                 ber_bvfree( scred );
 733                         }
 734                         rc = ld->ld_errno;
 735                         goto done;
 736                 }
 737
 738                 if( rc == LDAP_SUCCESS && saslrc == SASL_OK ) {
 739                         /* we're done, no need to step */
 740                         if( scred && scred->bv_len ) {
 741                                 /* but server provided us with data! */
 742 #ifdef NEW_LOGGING
 743                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 744                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 745                                         rc, saslrc, scred->bv_len );
 746 #else
 747                                 Debug( LDAP_DEBUG_TRACE,
 748                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 749                                         rc, saslrc, scred->bv_len );
 750 #endif
 751                                 ber_bvfree( scred );
 752                                 rc = ld->ld_errno = LDAP_LOCAL_ERROR;
 753                                 goto done;
 754                         }
 755                         break;
 756                 }
 757
 758                 do {
 759                         saslrc = sasl_client_step( ctx,
 760                                 (scred == NULL) ? NULL : scred->bv_val,
 761                                 (scred == NULL) ? 0 : scred->bv_len,
 762                                 &prompts,
 763                                 (SASL_CONST char **)&ccred.bv_val,
 764                                 &credlen );
 765
 766 #ifdef NEW_LOGGING
 767                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 768                                         "ldap_int_sasl_bind: sasl_client_step: %d\n", saslrc,0,0 );
 769 #else
 770                         Debug( LDAP_DEBUG_TRACE, "sasl_client_step: %d\n",
 771                                 saslrc, 0, 0 );
 772 #endif
 773
 774                         if( saslrc == SASL_INTERACT ) {
 775                                 int res;
 776                                 if( !interact ) break;
 777                                 res = (interact)( ld, flags, defaults, prompts );
 778                                 if( res != LDAP_SUCCESS ) break;
 779                         }
 780                 } while ( saslrc == SASL_INTERACT );
 781
 782                 ccred.bv_len = credlen;
 783                 ber_bvfree( scred );
 784
 785                 if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 786                         ld->ld_errno = sasl_err2ldap( saslrc );
 787 #if SASL_VERSION_MAJOR >= 2
 788                         ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 789 #endif
 790                         rc = ld->ld_errno;
 791                         goto done;
 792                 }
 793         } while ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 794
 795         if ( rc != LDAP_SUCCESS ) goto done;
 796
 797         if ( saslrc != SASL_OK ) {
 798 #if SASL_VERSION_MAJOR >= 2
 799                 ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 800 #endif
 801                 rc = ld->ld_errno = sasl_err2ldap( saslrc );
 802                 goto done;
 803         }
 804
 805         if( flags != LDAP_SASL_QUIET ) {
 806                 saslrc = sasl_getprop( ctx, SASL_USERNAME, (SASL_CONST void **) &data );
 807                 if( saslrc == SASL_OK && data && *data ) {
 808                         fprintf( stderr, "SASL username: %s\n", data );
 809                 }
 810
 811 #if SASL_VERSION_MAJOR < 2
 812                 saslrc = sasl_getprop( ctx, SASL_REALM, (SASL_CONST void **) &data );
 813                 if( saslrc == SASL_OK && data && *data ) {
 814                         fprintf( stderr, "SASL realm: %s\n", data );
 815                 }
 816 #endif
 817         }
 818
 819         saslrc = sasl_getprop( ctx, SASL_SSF, (SASL_CONST void **) &ssf );
 820         if( saslrc == SASL_OK ) {
 821                 if( flags != LDAP_SASL_QUIET ) {
 822                         fprintf( stderr, "SASL SSF: %lu\n",
 823                                 (unsigned long) *ssf );
 824                 }
 825
 826                 if( ssf && *ssf ) {
 827                         if( flags != LDAP_SASL_QUIET ) {
 828                                 fprintf( stderr, "SASL installing layers\n" );
 829                         }
 830                         if ( ld->ld_defconn->lconn_sasl_sockctx ) {
 831                                 oldctx = ld->ld_defconn->lconn_sasl_sockctx;
 832                                 sasl_dispose( &oldctx );
 833                                 ldap_pvt_sasl_remove( ld->ld_sb );
 834                         }
 835                         ldap_pvt_sasl_install( ld->ld_conns->lconn_sb, ctx );
 836                         ld->ld_defconn->lconn_sasl_sockctx = ctx;
 837                 }
 838         }
 839         ld->ld_defconn->lconn_sasl_authctx = ctx;
 840
 841 done:
 842         return rc;
 843 }
 844
 845 int
 846 ldap_int_sasl_external(
 847         LDAP *ld,
 848         LDAPConn *conn,
 849         const char * authid,
 850         ber_len_t ssf )
 851 {
 852         int sc;
 853         sasl_conn_t *ctx;
 854 #if SASL_VERSION_MAJOR < 2
 855         sasl_external_properties_t extprops;
 856 #endif
 857
 858         ctx = conn->lconn_sasl_authctx;
 859
 860         if ( ctx == NULL ) {
 861                 return LDAP_LOCAL_ERROR;
 862         }
 863
 864 #if SASL_VERSION_MAJOR >= 2
 865         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, &ssf );
 866         if ( sc == SASL_OK )
 867                 sc = sasl_setprop( ctx, SASL_AUTH_EXTERNAL, authid );
 868 #else
 869         memset( &extprops, '\0', sizeof(extprops) );
 870         extprops.ssf = ssf;
 871         extprops.auth_id = (char *) authid;
 872
 873         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
 874                 (void *) &extprops );
 875 #endif
 876
 877         if ( sc != SASL_OK ) {
 878                 return LDAP_LOCAL_ERROR;
 879         }
 880
 881         return LDAP_SUCCESS;
 882 }
 883
 884
 885 int ldap_pvt_sasl_secprops(
 886         const char *in,
 887         sasl_security_properties_t *secprops )
 888 {
 889         int i;
 890         char **props = ldap_str2charray( in, "," );
 891         unsigned sflags = 0;
 892         int got_sflags = 0;
 893         sasl_ssf_t max_ssf = 0;
 894         int got_max_ssf = 0;
 895         sasl_ssf_t min_ssf = 0;
 896         int got_min_ssf = 0;
 897         unsigned maxbufsize = 0;
 898         int got_maxbufsize = 0;
 899
 900         if( props == NULL || secprops == NULL ) {
 901                 return LDAP_PARAM_ERROR;
 902         }
 903
 904         for( i=0; props[i]; i++ ) {
 905                 if( !strcasecmp(props[i], "none") ) {
 906                         got_sflags++;
 907
 908                 } else if( !strcasecmp(props[i], "noplain") ) {
 909                         got_sflags++;
 910                         sflags |= SASL_SEC_NOPLAINTEXT;
 911
 912                 } else if( !strcasecmp(props[i], "noactive") ) {
 913                         got_sflags++;
 914                         sflags |= SASL_SEC_NOACTIVE;
 915
 916                 } else if( !strcasecmp(props[i], "nodict") ) {
 917                         got_sflags++;
 918                         sflags |= SASL_SEC_NODICTIONARY;
 919
 920                 } else if( !strcasecmp(props[i], "forwardsec") ) {
 921                         got_sflags++;
 922                         sflags |= SASL_SEC_FORWARD_SECRECY;
 923
 924                 } else if( !strcasecmp(props[i], "noanonymous")) {
 925                         got_sflags++;
 926                         sflags |= SASL_SEC_NOANONYMOUS;
 927
 928                 } else if( !strcasecmp(props[i], "passcred") ) {
 929                         got_sflags++;
 930                         sflags |= SASL_SEC_PASS_CREDENTIALS;
 931
 932                 } else if( !strncasecmp(props[i],
 933                         "minssf=", sizeof("minssf")) )
 934                 {
 935                         if( isdigit( (unsigned char) props[i][sizeof("minssf")] ) ) {
 936                                 got_min_ssf++;
 937                                 min_ssf = atoi( &props[i][sizeof("minssf")] );
 938                         } else {
 939                                 return LDAP_NOT_SUPPORTED;
 940                         }
 941
 942                 } else if( !strncasecmp(props[i],
 943                         "maxssf=", sizeof("maxssf")) )
 944                 {
 945                         if( isdigit( (unsigned char) props[i][sizeof("maxssf")] ) ) {
 946                                 got_max_ssf++;
 947                                 max_ssf = atoi( &props[i][sizeof("maxssf")] );
 948                         } else {
 949                                 return LDAP_NOT_SUPPORTED;
 950                         }
 951
 952                 } else if( !strncasecmp(props[i],
 953                         "maxbufsize=", sizeof("maxbufsize")) )
 954                 {
 955                         if( isdigit( (unsigned char) props[i][sizeof("maxbufsize")] ) ) {
 956                                 got_maxbufsize++;
 957                                 maxbufsize = atoi( &props[i][sizeof("maxbufsize")] );
 958                         } else {
 959                                 return LDAP_NOT_SUPPORTED;
 960                         }
 961
 962                         if( maxbufsize && (( maxbufsize < SASL_MIN_BUFF_SIZE )
 963                                 || (maxbufsize > SASL_MAX_BUFF_SIZE )))
 964                         {
 965                                 /* bad maxbufsize */
 966                                 return LDAP_PARAM_ERROR;
 967                         }
 968
 969                 } else {
 970                         return LDAP_NOT_SUPPORTED;
 971                 }
 972         }
 973
 974         if(got_sflags) {
 975                 secprops->security_flags = sflags;
 976         }
 977         if(got_min_ssf) {
 978                 secprops->min_ssf = min_ssf;
 979         }
 980         if(got_max_ssf) {
 981                 secprops->max_ssf = max_ssf;
 982         }
 983         if(got_maxbufsize) {
 984                 secprops->maxbufsize = maxbufsize;
 985         }
 986
 987         ldap_charray_free( props );
 988         return LDAP_SUCCESS;
 989 }
 990
 991 int
 992 ldap_int_sasl_config( struct ldapoptions *lo, int option, const char *arg )
 993 {
 994         int rc;
 995
 996         switch( option ) {
 997         case LDAP_OPT_X_SASL_SECPROPS:
 998                 rc = ldap_pvt_sasl_secprops( arg, &lo->ldo_sasl_secprops );
 999                 if( rc == LDAP_SUCCESS ) return 0;
1000         }
1001
1002         return -1;
1003 }
1004
1005 int
1006 ldap_int_sasl_get_option( LDAP *ld, int option, void *arg )
1007 {
1008         if ( ld == NULL )
1009                 return -1;
1010
1011         switch ( option ) {
1012                 case LDAP_OPT_X_SASL_MECH: {
1013                         *(char **)arg = ld->ld_options.ldo_def_sasl_mech
1014                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_mech ) : NULL;
1015                 } break;
1016                 case LDAP_OPT_X_SASL_REALM: {
1017                         *(char **)arg = ld->ld_options.ldo_def_sasl_realm
1018                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_realm ) : NULL;
1019                 } break;
1020                 case LDAP_OPT_X_SASL_AUTHCID: {
1021                         *(char **)arg = ld->ld_options.ldo_def_sasl_authcid
1022                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_authcid ) : NULL;
1023                 } break;
1024                 case LDAP_OPT_X_SASL_AUTHZID: {
1025                         *(char **)arg = ld->ld_options.ldo_def_sasl_authzid
1026                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_authzid ) : NULL;
1027                 } break;
1028
1029                 case LDAP_OPT_X_SASL_SSF: {
1030                         int sc;
1031                         sasl_ssf_t      *ssf;
1032                         sasl_conn_t *ctx;
1033
1034                         if( ld->ld_defconn == NULL ) {
1035                                 return -1;
1036                         }
1037
1038                         ctx = ld->ld_defconn->lconn_sasl_sockctx;
1039
1040                         if ( ctx == NULL ) {
1041                                 return -1;
1042                         }
1043
1044                         sc = sasl_getprop( ctx, SASL_SSF,
1045                                 (SASL_CONST void **) &ssf );
1046
1047                         if ( sc != SASL_OK ) {
1048                                 return -1;
1049                         }
1050
1051                         *(ber_len_t *)arg = *ssf;
1052                 } break;
1053
1054                 case LDAP_OPT_X_SASL_SSF_EXTERNAL:
1055                         /* this option is write only */
1056                         return -1;
1057
1058                 case LDAP_OPT_X_SASL_SSF_MIN:
1059                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.min_ssf;
1060                         break;
1061                 case LDAP_OPT_X_SASL_SSF_MAX:
1062                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.max_ssf;
1063                         break;
1064                 case LDAP_OPT_X_SASL_MAXBUFSIZE:
1065                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.maxbufsize;
1066                         break;
1067
1068                 case LDAP_OPT_X_SASL_SECPROPS:
1069                         /* this option is write only */
1070                         return -1;
1071
1072                 default:
1073                         return -1;
1074         }
1075         return 0;
1076 }
1077
1078 int
1079 ldap_int_sasl_set_option( LDAP *ld, int option, void *arg )
1080 {
1081         if ( ld == NULL )
1082                 return -1;
1083
1084         switch ( option ) {
1085         case LDAP_OPT_X_SASL_SSF:
1086                 /* This option is read-only */
1087                 return -1;
1088
1089         case LDAP_OPT_X_SASL_SSF_EXTERNAL: {
1090                 int sc;
1091 #if SASL_VERSION_MAJOR < 2
1092                 sasl_external_properties_t extprops;
1093 #endif
1094                 sasl_conn_t *ctx;
1095
1096                 if( ld->ld_defconn == NULL ) {
1097                         return -1;
1098                 }
1099
1100                 ctx = ld->ld_defconn->lconn_sasl_authctx;
1101
1102                 if ( ctx == NULL ) {
1103                         return -1;
1104                 }
1105
1106 #if SASL_VERSION_MAJOR >= 2
1107                 sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, arg);
1108 #else
1109                 memset(&extprops, 0L, sizeof(extprops));
1110
1111                 extprops.ssf = * (ber_len_t *) arg;
1112
1113                 sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
1114                         (void *) &extprops );
1115 #endif
1116
1117                 if ( sc != SASL_OK ) {
1118                         return -1;
1119                 }
1120                 } break;
1121
1122         case LDAP_OPT_X_SASL_SSF_MIN:
1123                 ld->ld_options.ldo_sasl_secprops.min_ssf = *(ber_len_t *)arg;
1124                 break;
1125         case LDAP_OPT_X_SASL_SSF_MAX:
1126                 ld->ld_options.ldo_sasl_secprops.max_ssf = *(ber_len_t *)arg;
1127                 break;
1128         case LDAP_OPT_X_SASL_MAXBUFSIZE:
1129                 ld->ld_options.ldo_sasl_secprops.maxbufsize = *(ber_len_t *)arg;
1130                 break;
1131
1132         case LDAP_OPT_X_SASL_SECPROPS: {
1133                 int sc;
1134                 sc = ldap_pvt_sasl_secprops( (char *) arg,
1135                         &ld->ld_options.ldo_sasl_secprops );
1136
1137                 return sc == LDAP_SUCCESS ? 0 : -1;
1138                 }
1139
1140         default:
1141                 return -1;
1142         }
1143         return 0;
1144 }
1145
1146 #ifdef LDAP_R_COMPILE
1147 #define LDAP_DEBUG_R_SASL
1148 void *ldap_pvt_sasl_mutex_new(void)
1149 {
1150         ldap_pvt_thread_mutex_t *mutex;
1151
1152         mutex = (ldap_pvt_thread_mutex_t *) LDAP_MALLOC(
1153                 sizeof(ldap_pvt_thread_mutex_t) );
1154
1155         if ( ldap_pvt_thread_mutex_init( mutex ) == 0 ) {
1156                 return mutex;
1157         }
1158 #ifndef LDAP_DEBUG_R_SASL
1159         assert( 0 );
1160 #endif /* !LDAP_DEBUG_R_SASL */
1161         return NULL;
1162 }
1163
1164 int ldap_pvt_sasl_mutex_lock(void *mutex)
1165 {
1166 #ifdef LDAP_DEBUG_R_SASL
1167         if ( mutex == NULL ) {
1168                 return SASL_OK;
1169         }
1170 #else /* !LDAP_DEBUG_R_SASL */
1171         assert( mutex );
1172 #endif /* !LDAP_DEBUG_R_SASL */
1173         return ldap_pvt_thread_mutex_lock( (ldap_pvt_thread_mutex_t *)mutex )
1174                 ? SASL_FAIL : SASL_OK;
1175 }
1176
1177 int ldap_pvt_sasl_mutex_unlock(void *mutex)
1178 {
1179 #ifdef LDAP_DEBUG_R_SASL
1180         if ( mutex == NULL ) {
1181                 return SASL_OK;
1182         }
1183 #else /* !LDAP_DEBUG_R_SASL */
1184         assert( mutex );
1185 #endif /* !LDAP_DEBUG_R_SASL */
1186         return ldap_pvt_thread_mutex_unlock( (ldap_pvt_thread_mutex_t *)mutex )
1187                 ? SASL_FAIL : SASL_OK;
1188 }
1189
1190 void ldap_pvt_sasl_mutex_dispose(void *mutex)
1191 {
1192 #ifdef LDAP_DEBUG_R_SASL
1193         if ( mutex == NULL ) {
1194                 return;
1195         }
1196 #else /* !LDAP_DEBUG_R_SASL */
1197         assert( mutex );
1198 #endif /* !LDAP_DEBUG_R_SASL */
1199         (void) ldap_pvt_thread_mutex_destroy( (ldap_pvt_thread_mutex_t *)mutex );
1200         LDAP_FREE( mutex );
1201 }
1202 #endif
1203
1204 #else
1205 int ldap_int_sasl_init( void )
1206 { return LDAP_SUCCESS; }
1207
1208 int ldap_int_sasl_close( LDAP *ld, LDAPConn *lc )
1209 { return LDAP_SUCCESS; }
1210
1211 int
1212 ldap_int_sasl_bind(
1213         LDAP                    *ld,
1214         const char              *dn,
1215         const char              *mechs,
1216         LDAPControl             **sctrls,
1217         LDAPControl             **cctrls,
1218         unsigned                flags,
1219         LDAP_SASL_INTERACT_PROC *interact,
1220         void * defaults )
1221 { return LDAP_NOT_SUPPORTED; }
1222
1223 int
1224 ldap_int_sasl_external(
1225         LDAP *ld,
1226         LDAPConn *conn,
1227         const char * authid,
1228         ber_len_t ssf )
1229 { return LDAP_SUCCESS; }
1230
1231 #endif /* HAVE_CYRUS_SASL */