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         ret = sasl_decode( p->sasl_context, p->sec_buf_in.buf_base,
 310                 p->sec_buf_in.buf_end,
 311                 (SASL_CONST char **)&p->buf_in.buf_base,
 312                 (unsigned *)&p->buf_in.buf_end );
 313
 314         /* Drop the packet from the input buffer */
 315         sb_sasl_drop_packet( &p->sec_buf_in, sbiod->sbiod_sb->sb_debug );
 316
 317         if ( ret != SASL_OK ) {
 318                 ber_log_printf( LDAP_DEBUG_ANY, sbiod->sbiod_sb->sb_debug,
 319                         "sb_sasl_read: failed to decode packet: %s\n",
 320                         sasl_errstring( ret, NULL, NULL ) );
 321                 errno = EIO;
 322                 return -1;
 323         }
 324
 325         p->buf_in.buf_size = p->buf_in.buf_end;
 326
 327         bufptr += ber_pvt_sb_copy_out( &p->buf_in, (char*) buf + bufptr, len );
 328
 329         return bufptr;
 330 }
 331
 332 static ber_slen_t
 333 sb_sasl_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
 334 {
 335         struct sb_sasl_data     *p;
 336         int                     ret;
 337
 338         assert( sbiod != NULL );
 339         assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
 340
 341         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 342
 343         /* Are there anything left in the buffer? */
 344         if ( p->buf_out.buf_ptr != p->buf_out.buf_end ) {
 345                 ret = ber_pvt_sb_do_write( sbiod, &p->buf_out );
 346                 if ( ret < 0 )
 347                         return ret;
 348                 /* Still have something left?? */
 349                 if ( p->buf_out.buf_ptr != p->buf_out.buf_end ) {
 350                         errno = EAGAIN;
 351                         return 0;
 352                 }
 353         }
 354
 355         /* now encode the next packet. */
 356 #if SASL_VERSION_MAJOR >= 2
 357         ber_pvt_sb_buf_init( &p->buf_out );
 358 #else
 359         ber_pvt_sb_buf_destroy( &p->buf_out );
 360 #endif
 361         if ( len > *p->sasl_maxbuf - 100 )
 362                 len = *p->sasl_maxbuf - 100;    /* For safety margin */
 363         ret = sasl_encode( p->sasl_context, buf, len,
 364                 (SASL_CONST char **)&p->buf_out.buf_base,
 365                 (unsigned *)&p->buf_out.buf_size );
 366         if ( ret != SASL_OK ) {
 367                 ber_log_printf( LDAP_DEBUG_ANY, sbiod->sbiod_sb->sb_debug,
 368                         "sb_sasl_write: failed to encode packet: %s\n",
 369                         sasl_errstring( ret, NULL, NULL ) );
 370                 return -1;
 371         }
 372         p->buf_out.buf_end = p->buf_out.buf_size;
 373
 374         ret = ber_pvt_sb_do_write( sbiod, &p->buf_out );
 375         if ( ret <= 0 ) {
 376                 /* caller will retry, so clear this buffer out */
 377                 p->buf_out.buf_ptr = p->buf_out.buf_end;
 378                 return ret;
 379         }
 380         return len;
 381 }
 382
 383 static int
 384 sb_sasl_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
 385 {
 386         struct sb_sasl_data     *p;
 387
 388         p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
 389
 390         if ( opt == LBER_SB_OPT_DATA_READY ) {
 391                 if ( p->buf_in.buf_ptr != p->buf_in.buf_end )
 392                         return 1;
 393         }
 394
 395         return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
 396 }
 397
 398 Sockbuf_IO ldap_pvt_sockbuf_io_sasl = {
 399         sb_sasl_setup,          /* sbi_setup */
 400         sb_sasl_remove,         /* sbi_remove */
 401         sb_sasl_ctrl,           /* sbi_ctrl */
 402         sb_sasl_read,           /* sbi_read */
 403         sb_sasl_write,          /* sbi_write */
 404         NULL                    /* sbi_close */
 405 };
 406
 407 int ldap_pvt_sasl_install( Sockbuf *sb, void *ctx_arg )
 408 {
 409 #ifdef NEW_LOGGING
 410         LDAP_LOG ( TRANSPORT, ENTRY, "ldap_pvt_sasl_install\n", 0, 0, 0 );
 411 #else
 412         Debug( LDAP_DEBUG_TRACE, "ldap_pvt_sasl_install\n",
 413                 0, 0, 0 );
 414 #endif
 415
 416         /* don't install the stuff unless security has been negotiated */
 417
 418         if ( !ber_sockbuf_ctrl( sb, LBER_SB_OPT_HAS_IO,
 419                         &ldap_pvt_sockbuf_io_sasl ) )
 420         {
 421 #ifdef LDAP_DEBUG
 422                 ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
 423                         LBER_SBIOD_LEVEL_APPLICATION, (void *)"sasl_" );
 424 #endif
 425                 ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_sasl,
 426                         LBER_SBIOD_LEVEL_APPLICATION, ctx_arg );
 427         }
 428
 429         return LDAP_SUCCESS;
 430 }
 431
 432 void ldap_pvt_sasl_remove( Sockbuf *sb )
 433 {
 434         ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_sasl,
 435                 LBER_SBIOD_LEVEL_APPLICATION );
 436 #ifdef LDAP_DEBUG
 437         ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
 438                 LBER_SBIOD_LEVEL_APPLICATION );
 439 #endif
 440 }
 441
 442 static int
 443 sasl_err2ldap( int saslerr )
 444 {
 445         int rc;
 446
 447         switch (saslerr) {
 448                 case SASL_CONTINUE:
 449                         rc = LDAP_MORE_RESULTS_TO_RETURN;
 450                         break;
 451                 case SASL_INTERACT:
 452                         rc = LDAP_LOCAL_ERROR;
 453                         break;
 454                 case SASL_OK:
 455                         rc = LDAP_SUCCESS;
 456                         break;
 457                 case SASL_FAIL:
 458                         rc = LDAP_LOCAL_ERROR;
 459                         break;
 460                 case SASL_NOMEM:
 461                         rc = LDAP_NO_MEMORY;
 462                         break;
 463                 case SASL_NOMECH:
 464                         rc = LDAP_AUTH_UNKNOWN;
 465                         break;
 466                 case SASL_BADAUTH:
 467                         rc = LDAP_AUTH_UNKNOWN;
 468                         break;
 469                 case SASL_NOAUTHZ:
 470                         rc = LDAP_PARAM_ERROR;
 471                         break;
 472                 case SASL_TOOWEAK:
 473                 case SASL_ENCRYPT:
 474                         rc = LDAP_AUTH_UNKNOWN;
 475                         break;
 476                 default:
 477                         rc = LDAP_LOCAL_ERROR;
 478                         break;
 479         }
 480
 481         assert( rc == LDAP_SUCCESS || LDAP_API_ERROR( rc ) );
 482         return rc;
 483 }
 484
 485 int
 486 ldap_int_sasl_open(
 487         LDAP *ld,
 488         LDAPConn *lc,
 489         const char * host )
 490 {
 491         int rc;
 492         sasl_conn_t *ctx;
 493
 494         assert( lc->lconn_sasl_authctx == NULL );
 495
 496         if ( host == NULL ) {
 497                 ld->ld_errno = LDAP_LOCAL_ERROR;
 498                 return ld->ld_errno;
 499         }
 500
 501         if ( ldap_int_sasl_init() ) {
 502                 ld->ld_errno = LDAP_LOCAL_ERROR;
 503                 return ld->ld_errno;
 504         }
 505
 506 #if SASL_VERSION_MAJOR >= 2
 507         rc = sasl_client_new( "ldap", host, NULL, NULL,
 508                 client_callbacks, 0, &ctx );
 509 #else
 510         rc = sasl_client_new( "ldap", host, client_callbacks,
 511                 SASL_SECURITY_LAYER, &ctx );
 512 #endif
 513
 514         if ( rc != SASL_OK ) {
 515                 ld->ld_errno = sasl_err2ldap( rc );
 516                 return ld->ld_errno;
 517         }
 518
 519 #ifdef NEW_LOGGING
 520         LDAP_LOG ( TRANSPORT, DETAIL1, "ldap_int_sasl_open: host=%s\n",
 521                 host, 0, 0 );
 522 #else
 523         Debug( LDAP_DEBUG_TRACE, "ldap_int_sasl_open: host=%s\n",
 524                 host, 0, 0 );
 525 #endif
 526
 527         lc->lconn_sasl_authctx = ctx;
 528
 529         return LDAP_SUCCESS;
 530 }
 531
 532 int ldap_int_sasl_close( LDAP *ld, LDAPConn *lc )
 533 {
 534         sasl_conn_t *ctx = lc->lconn_sasl_authctx;
 535
 536         if( ctx != NULL ) {
 537                 sasl_dispose( &ctx );
 538                 if ( lc->lconn_sasl_sockctx &&
 539                         lc->lconn_sasl_authctx != lc->lconn_sasl_sockctx ) {
 540                         ctx = lc->lconn_sasl_sockctx;
 541                         sasl_dispose( &ctx );
 542                 }
 543                 lc->lconn_sasl_sockctx = NULL;
 544                 lc->lconn_sasl_authctx = NULL;
 545         }
 546
 547         return LDAP_SUCCESS;
 548 }
 549
 550 int
 551 ldap_int_sasl_bind(
 552         LDAP                    *ld,
 553         const char              *dn,
 554         const char              *mechs,
 555         LDAPControl             **sctrls,
 556         LDAPControl             **cctrls,
 557         unsigned                flags,
 558         LDAP_SASL_INTERACT_PROC *interact,
 559         void * defaults )
 560 {
 561         char *data;
 562         const char *mech = NULL;
 563         const char *pmech = NULL;
 564         int                     saslrc, rc;
 565         sasl_ssf_t              *ssf = NULL;
 566         sasl_conn_t     *ctx, *oldctx = NULL;
 567         sasl_interact_t *prompts = NULL;
 568         unsigned credlen;
 569         struct berval ccred;
 570         ber_socket_t            sd;
 571         void    *ssl;
 572
 573 #ifdef NEW_LOGGING
 574         LDAP_LOG ( TRANSPORT, ARGS, "ldap_int_sasl_bind: %s\n",
 575                 mechs ? mechs : "<null>", 0, 0 );
 576 #else
 577         Debug( LDAP_DEBUG_TRACE, "ldap_int_sasl_bind: %s\n",
 578                 mechs ? mechs : "<null>", 0, 0 );
 579 #endif
 580
 581         /* do a quick !LDAPv3 check... ldap_sasl_bind will do the rest. */
 582         if (ld->ld_version < LDAP_VERSION3) {
 583                 ld->ld_errno = LDAP_NOT_SUPPORTED;
 584                 return ld->ld_errno;
 585         }
 586
 587         ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, &sd );
 588
 589         if ( sd == AC_SOCKET_INVALID ) {
 590                 /* not connected yet */
 591                 int rc;
 592
 593                 rc = ldap_open_defconn( ld );
 594                 if( rc < 0 ) return ld->ld_errno;
 595
 596                 ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, &sd );
 597
 598                 if( sd == AC_SOCKET_INVALID ) {
 599                         ld->ld_errno = LDAP_LOCAL_ERROR;
 600                         return ld->ld_errno;
 601                 }
 602         }
 603
 604         oldctx = ld->ld_defconn->lconn_sasl_authctx;
 605
 606         /* If we already have an authentication context, clear it out */
 607         if( oldctx ) {
 608                 if ( oldctx != ld->ld_defconn->lconn_sasl_sockctx ) {
 609                         sasl_dispose( &oldctx );
 610                 }
 611                 ld->ld_defconn->lconn_sasl_authctx = NULL;
 612         }
 613
 614         { char *saslhost = ldap_host_connected_to( ld->ld_sb, "localhost" );
 615         rc = ldap_int_sasl_open( ld, ld->ld_defconn, saslhost );
 616         LDAP_FREE( saslhost );
 617         }
 618
 619         if ( rc != LDAP_SUCCESS ) return rc;
 620
 621         ctx = ld->ld_defconn->lconn_sasl_authctx;
 622
 623         /* Check for TLS */
 624         ssl = ldap_pvt_tls_sb_ctx( ld->ld_sb );
 625         if ( ssl ) {
 626                 struct berval authid = BER_BVNULL;
 627                 ber_len_t fac;
 628
 629                 fac = ldap_pvt_tls_get_strength( ssl );
 630                 /* failure is OK, we just can't use SASL EXTERNAL */
 631                 (void) ldap_pvt_tls_get_my_dn( ssl, &authid, NULL, 0 );
 632
 633                 (void) ldap_int_sasl_external( ld, ld->ld_defconn, authid.bv_val, fac );
 634                 LDAP_FREE( authid.bv_val );
 635         }
 636
 637 #if !defined(_WIN32)
 638         /* Check for local */
 639         if ( ldap_pvt_url_scheme2proto( ld->ld_defconn->lconn_server->lud_scheme ) == LDAP_PROTO_IPC ) {
 640                 char authid[sizeof("uidNumber=4294967295+gidNumber=4294967295,"
 641                         "cn=peercred,cn=external,cn=auth")];
 642                 sprintf( authid, "uidNumber=%d+gidNumber=%d,"
 643                         "cn=peercred,cn=external,cn=auth",
 644                         (int) geteuid(), (int) getegid() );
 645                 (void) ldap_int_sasl_external( ld, ld->ld_defconn, authid, LDAP_PVT_SASL_LOCAL_SSF );
 646         }
 647 #endif
 648
 649         /* (re)set security properties */
 650         sasl_setprop( ctx, SASL_SEC_PROPS,
 651                 &ld->ld_options.ldo_sasl_secprops );
 652
 653         ccred.bv_val = NULL;
 654         ccred.bv_len = 0;
 655
 656         do {
 657                 saslrc = sasl_client_start( ctx,
 658                         mechs,
 659 #if SASL_VERSION_MAJOR < 2
 660                         NULL,
 661 #endif
 662                         &prompts,
 663                         (SASL_CONST char **)&ccred.bv_val,
 664                         &credlen,
 665                         &mech );
 666
 667                 if( pmech == NULL && mech != NULL ) {
 668                         pmech = mech;
 669
 670                         if( flags != LDAP_SASL_QUIET ) {
 671                                 fprintf(stderr,
 672                                         "SASL/%s authentication started\n",
 673                                         pmech );
 674                         }
 675                 }
 676
 677                 if( saslrc == SASL_INTERACT ) {
 678                         int res;
 679                         if( !interact ) break;
 680                         res = (interact)( ld, flags, defaults, prompts );
 681
 682                         if( res != LDAP_SUCCESS ) break;
 683                 }
 684         } while ( saslrc == SASL_INTERACT );
 685
 686         ccred.bv_len = credlen;
 687
 688         if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 689                 rc = ld->ld_errno = sasl_err2ldap( saslrc );
 690 #if SASL_VERSION_MAJOR >= 2
 691                 ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 692 #endif
 693                 goto done;
 694         }
 695
 696         do {
 697                 struct berval *scred;
 698                 unsigned credlen;
 699
 700                 scred = NULL;
 701
 702                 rc = ldap_sasl_bind_s( ld, dn, mech, &ccred, sctrls, cctrls, &scred );
 703
 704                 if ( ccred.bv_val != NULL ) {
 705 #if SASL_VERSION_MAJOR < 2
 706                         LDAP_FREE( ccred.bv_val );
 707 #endif
 708                         ccred.bv_val = NULL;
 709                 }
 710
 711                 if ( rc != LDAP_SUCCESS && rc != LDAP_SASL_BIND_IN_PROGRESS ) {
 712                         if( scred && scred->bv_len ) {
 713                                 /* and server provided us with data? */
 714 #ifdef NEW_LOGGING
 715                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 716                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 717                                         rc, saslrc, scred->bv_len );
 718 #else
 719                                 Debug( LDAP_DEBUG_TRACE,
 720                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 721                                         rc, saslrc, scred->bv_len );
 722 #endif
 723                                 ber_bvfree( scred );
 724                         }
 725                         rc = ld->ld_errno;
 726                         goto done;
 727                 }
 728
 729                 if( rc == LDAP_SUCCESS && saslrc == SASL_OK ) {
 730                         /* we're done, no need to step */
 731                         if( scred && scred->bv_len ) {
 732                                 /* but server provided us with data! */
 733 #ifdef NEW_LOGGING
 734                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 735                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 736                                         rc, saslrc, scred->bv_len );
 737 #else
 738                                 Debug( LDAP_DEBUG_TRACE,
 739                                         "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
 740                                         rc, saslrc, scred->bv_len );
 741 #endif
 742                                 ber_bvfree( scred );
 743                                 rc = ld->ld_errno = LDAP_LOCAL_ERROR;
 744                                 goto done;
 745                         }
 746                         break;
 747                 }
 748
 749                 do {
 750                         saslrc = sasl_client_step( ctx,
 751                                 (scred == NULL) ? NULL : scred->bv_val,
 752                                 (scred == NULL) ? 0 : scred->bv_len,
 753                                 &prompts,
 754                                 (SASL_CONST char **)&ccred.bv_val,
 755                                 &credlen );
 756
 757 #ifdef NEW_LOGGING
 758                                 LDAP_LOG ( TRANSPORT, DETAIL1,
 759                                         "ldap_int_sasl_bind: sasl_client_step: %d\n", saslrc,0,0 );
 760 #else
 761                         Debug( LDAP_DEBUG_TRACE, "sasl_client_step: %d\n",
 762                                 saslrc, 0, 0 );
 763 #endif
 764
 765                         if( saslrc == SASL_INTERACT ) {
 766                                 int res;
 767                                 if( !interact ) break;
 768                                 res = (interact)( ld, flags, defaults, prompts );
 769                                 if( res != LDAP_SUCCESS ) break;
 770                         }
 771                 } while ( saslrc == SASL_INTERACT );
 772
 773                 ccred.bv_len = credlen;
 774                 ber_bvfree( scred );
 775
 776                 if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
 777                         ld->ld_errno = sasl_err2ldap( saslrc );
 778 #if SASL_VERSION_MAJOR >= 2
 779                         ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 780 #endif
 781                         rc = ld->ld_errno;
 782                         goto done;
 783                 }
 784         } while ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 785
 786         if ( rc != LDAP_SUCCESS ) goto done;
 787
 788         if ( saslrc != SASL_OK ) {
 789 #if SASL_VERSION_MAJOR >= 2
 790                 ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
 791 #endif
 792                 rc = ld->ld_errno = sasl_err2ldap( saslrc );
 793                 goto done;
 794         }
 795
 796         if( flags != LDAP_SASL_QUIET ) {
 797                 saslrc = sasl_getprop( ctx, SASL_USERNAME, (SASL_CONST void **) &data );
 798                 if( saslrc == SASL_OK && data && *data ) {
 799                         fprintf( stderr, "SASL username: %s\n", data );
 800                 }
 801
 802 #if SASL_VERSION_MAJOR < 2
 803                 saslrc = sasl_getprop( ctx, SASL_REALM, (SASL_CONST void **) &data );
 804                 if( saslrc == SASL_OK && data && *data ) {
 805                         fprintf( stderr, "SASL realm: %s\n", data );
 806                 }
 807 #endif
 808         }
 809
 810         saslrc = sasl_getprop( ctx, SASL_SSF, (SASL_CONST void **) &ssf );
 811         if( saslrc == SASL_OK ) {
 812                 if( flags != LDAP_SASL_QUIET ) {
 813                         fprintf( stderr, "SASL SSF: %lu\n",
 814                                 (unsigned long) *ssf );
 815                 }
 816
 817                 if( ssf && *ssf ) {
 818                         if( flags != LDAP_SASL_QUIET ) {
 819                                 fprintf( stderr, "SASL installing layers\n" );
 820                         }
 821                         if ( ld->ld_defconn->lconn_sasl_sockctx ) {
 822                                 oldctx = ld->ld_defconn->lconn_sasl_sockctx;
 823                                 sasl_dispose( &oldctx );
 824                                 ldap_pvt_sasl_remove( ld->ld_sb );
 825                         }
 826                         ldap_pvt_sasl_install( ld->ld_conns->lconn_sb, ctx );
 827                         ld->ld_defconn->lconn_sasl_sockctx = ctx;
 828                 }
 829         }
 830         ld->ld_defconn->lconn_sasl_authctx = ctx;
 831
 832 done:
 833         return rc;
 834 }
 835
 836 int
 837 ldap_int_sasl_external(
 838         LDAP *ld,
 839         LDAPConn *conn,
 840         const char * authid,
 841         ber_len_t ssf )
 842 {
 843         int sc;
 844         sasl_conn_t *ctx;
 845 #if SASL_VERSION_MAJOR < 2
 846         sasl_external_properties_t extprops;
 847 #endif
 848
 849         ctx = conn->lconn_sasl_authctx;
 850
 851         if ( ctx == NULL ) {
 852                 return LDAP_LOCAL_ERROR;
 853         }
 854
 855 #if SASL_VERSION_MAJOR >= 2
 856         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, &ssf );
 857         if ( sc == SASL_OK )
 858                 sc = sasl_setprop( ctx, SASL_AUTH_EXTERNAL, authid );
 859 #else
 860         memset( &extprops, '\0', sizeof(extprops) );
 861         extprops.ssf = ssf;
 862         extprops.auth_id = (char *) authid;
 863
 864         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
 865                 (void *) &extprops );
 866 #endif
 867
 868         if ( sc != SASL_OK ) {
 869                 return LDAP_LOCAL_ERROR;
 870         }
 871
 872         return LDAP_SUCCESS;
 873 }
 874
 875
 876 int ldap_pvt_sasl_secprops(
 877         const char *in,
 878         sasl_security_properties_t *secprops )
 879 {
 880         int i;
 881         char **props = ldap_str2charray( in, "," );
 882         unsigned sflags = 0;
 883         int got_sflags = 0;
 884         sasl_ssf_t max_ssf = 0;
 885         int got_max_ssf = 0;
 886         sasl_ssf_t min_ssf = 0;
 887         int got_min_ssf = 0;
 888         unsigned maxbufsize = 0;
 889         int got_maxbufsize = 0;
 890
 891         if( props == NULL || secprops == NULL ) {
 892                 return LDAP_PARAM_ERROR;
 893         }
 894
 895         for( i=0; props[i]; i++ ) {
 896                 if( !strcasecmp(props[i], "none") ) {
 897                         got_sflags++;
 898
 899                 } else if( !strcasecmp(props[i], "noplain") ) {
 900                         got_sflags++;
 901                         sflags |= SASL_SEC_NOPLAINTEXT;
 902
 903                 } else if( !strcasecmp(props[i], "noactive") ) {
 904                         got_sflags++;
 905                         sflags |= SASL_SEC_NOACTIVE;
 906
 907                 } else if( !strcasecmp(props[i], "nodict") ) {
 908                         got_sflags++;
 909                         sflags |= SASL_SEC_NODICTIONARY;
 910
 911                 } else if( !strcasecmp(props[i], "forwardsec") ) {
 912                         got_sflags++;
 913                         sflags |= SASL_SEC_FORWARD_SECRECY;
 914
 915                 } else if( !strcasecmp(props[i], "noanonymous")) {
 916                         got_sflags++;
 917                         sflags |= SASL_SEC_NOANONYMOUS;
 918
 919                 } else if( !strcasecmp(props[i], "passcred") ) {
 920                         got_sflags++;
 921                         sflags |= SASL_SEC_PASS_CREDENTIALS;
 922
 923                 } else if( !strncasecmp(props[i],
 924                         "minssf=", sizeof("minssf")) )
 925                 {
 926                         if( isdigit( (unsigned char) props[i][sizeof("minssf")] ) ) {
 927                                 got_min_ssf++;
 928                                 min_ssf = atoi( &props[i][sizeof("minssf")] );
 929                         } else {
 930                                 return LDAP_NOT_SUPPORTED;
 931                         }
 932
 933                 } else if( !strncasecmp(props[i],
 934                         "maxssf=", sizeof("maxssf")) )
 935                 {
 936                         if( isdigit( (unsigned char) props[i][sizeof("maxssf")] ) ) {
 937                                 got_max_ssf++;
 938                                 max_ssf = atoi( &props[i][sizeof("maxssf")] );
 939                         } else {
 940                                 return LDAP_NOT_SUPPORTED;
 941                         }
 942
 943                 } else if( !strncasecmp(props[i],
 944                         "maxbufsize=", sizeof("maxbufsize")) )
 945                 {
 946                         if( isdigit( (unsigned char) props[i][sizeof("maxbufsize")] ) ) {
 947                                 got_maxbufsize++;
 948                                 maxbufsize = atoi( &props[i][sizeof("maxbufsize")] );
 949                         } else {
 950                                 return LDAP_NOT_SUPPORTED;
 951                         }
 952
 953                         if( maxbufsize && (( maxbufsize < SASL_MIN_BUFF_SIZE )
 954                                 || (maxbufsize > SASL_MAX_BUFF_SIZE )))
 955                         {
 956                                 /* bad maxbufsize */
 957                                 return LDAP_PARAM_ERROR;
 958                         }
 959
 960                 } else {
 961                         return LDAP_NOT_SUPPORTED;
 962                 }
 963         }
 964
 965         if(got_sflags) {
 966                 secprops->security_flags = sflags;
 967         }
 968         if(got_min_ssf) {
 969                 secprops->min_ssf = min_ssf;
 970         }
 971         if(got_max_ssf) {
 972                 secprops->max_ssf = max_ssf;
 973         }
 974         if(got_maxbufsize) {
 975                 secprops->maxbufsize = maxbufsize;
 976         }
 977
 978         ldap_charray_free( props );
 979         return LDAP_SUCCESS;
 980 }
 981
 982 int
 983 ldap_int_sasl_config( struct ldapoptions *lo, int option, const char *arg )
 984 {
 985         int rc;
 986
 987         switch( option ) {
 988         case LDAP_OPT_X_SASL_SECPROPS:
 989                 rc = ldap_pvt_sasl_secprops( arg, &lo->ldo_sasl_secprops );
 990                 if( rc == LDAP_SUCCESS ) return 0;
 991         }
 992
 993         return -1;
 994 }
 995
 996 int
 997 ldap_int_sasl_get_option( LDAP *ld, int option, void *arg )
 998 {
 999         if ( ld == NULL )
1000                 return -1;
1001
1002         switch ( option ) {
1003                 case LDAP_OPT_X_SASL_MECH: {
1004                         *(char **)arg = ld->ld_options.ldo_def_sasl_mech
1005                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_mech ) : NULL;
1006                 } break;
1007                 case LDAP_OPT_X_SASL_REALM: {
1008                         *(char **)arg = ld->ld_options.ldo_def_sasl_realm
1009                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_realm ) : NULL;
1010                 } break;
1011                 case LDAP_OPT_X_SASL_AUTHCID: {
1012                         *(char **)arg = ld->ld_options.ldo_def_sasl_authcid
1013                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_authcid ) : NULL;
1014                 } break;
1015                 case LDAP_OPT_X_SASL_AUTHZID: {
1016                         *(char **)arg = ld->ld_options.ldo_def_sasl_authzid
1017                                 ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_authzid ) : NULL;
1018                 } break;
1019
1020                 case LDAP_OPT_X_SASL_SSF: {
1021                         int sc;
1022                         sasl_ssf_t      *ssf;
1023                         sasl_conn_t *ctx;
1024
1025                         if( ld->ld_defconn == NULL ) {
1026                                 return -1;
1027                         }
1028
1029                         ctx = ld->ld_defconn->lconn_sasl_sockctx;
1030
1031                         if ( ctx == NULL ) {
1032                                 return -1;
1033                         }
1034
1035                         sc = sasl_getprop( ctx, SASL_SSF,
1036                                 (SASL_CONST void **) &ssf );
1037
1038                         if ( sc != SASL_OK ) {
1039                                 return -1;
1040                         }
1041
1042                         *(ber_len_t *)arg = *ssf;
1043                 } break;
1044
1045                 case LDAP_OPT_X_SASL_SSF_EXTERNAL:
1046                         /* this option is write only */
1047                         return -1;
1048
1049                 case LDAP_OPT_X_SASL_SSF_MIN:
1050                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.min_ssf;
1051                         break;
1052                 case LDAP_OPT_X_SASL_SSF_MAX:
1053                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.max_ssf;
1054                         break;
1055                 case LDAP_OPT_X_SASL_MAXBUFSIZE:
1056                         *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.maxbufsize;
1057                         break;
1058
1059                 case LDAP_OPT_X_SASL_SECPROPS:
1060                         /* this option is write only */
1061                         return -1;
1062
1063                 default:
1064                         return -1;
1065         }
1066         return 0;
1067 }
1068
1069 int
1070 ldap_int_sasl_set_option( LDAP *ld, int option, void *arg )
1071 {
1072         if ( ld == NULL )
1073                 return -1;
1074
1075         switch ( option ) {
1076         case LDAP_OPT_X_SASL_SSF:
1077                 /* This option is read-only */
1078                 return -1;
1079
1080         case LDAP_OPT_X_SASL_SSF_EXTERNAL: {
1081                 int sc;
1082 #if SASL_VERSION_MAJOR < 2
1083                 sasl_external_properties_t extprops;
1084 #endif
1085                 sasl_conn_t *ctx;
1086
1087                 if( ld->ld_defconn == NULL ) {
1088                         return -1;
1089                 }
1090
1091                 ctx = ld->ld_defconn->lconn_sasl_authctx;
1092
1093                 if ( ctx == NULL ) {
1094                         return -1;
1095                 }
1096
1097 #if SASL_VERSION_MAJOR >= 2
1098                 sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, arg);
1099 #else
1100                 memset(&extprops, 0L, sizeof(extprops));
1101
1102                 extprops.ssf = * (ber_len_t *) arg;
1103
1104                 sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
1105                         (void *) &extprops );
1106 #endif
1107
1108                 if ( sc != SASL_OK ) {
1109                         return -1;
1110                 }
1111                 } break;
1112
1113         case LDAP_OPT_X_SASL_SSF_MIN:
1114                 ld->ld_options.ldo_sasl_secprops.min_ssf = *(ber_len_t *)arg;
1115                 break;
1116         case LDAP_OPT_X_SASL_SSF_MAX:
1117                 ld->ld_options.ldo_sasl_secprops.max_ssf = *(ber_len_t *)arg;
1118                 break;
1119         case LDAP_OPT_X_SASL_MAXBUFSIZE:
1120                 ld->ld_options.ldo_sasl_secprops.maxbufsize = *(ber_len_t *)arg;
1121                 break;
1122
1123         case LDAP_OPT_X_SASL_SECPROPS: {
1124                 int sc;
1125                 sc = ldap_pvt_sasl_secprops( (char *) arg,
1126                         &ld->ld_options.ldo_sasl_secprops );
1127
1128                 return sc == LDAP_SUCCESS ? 0 : -1;
1129                 }
1130
1131         default:
1132                 return -1;
1133         }
1134         return 0;
1135 }
1136
1137 #ifdef LDAP_R_COMPILE
1138 #define LDAP_DEBUG_R_SASL
1139 void *ldap_pvt_sasl_mutex_new(void)
1140 {
1141         ldap_pvt_thread_mutex_t *mutex;
1142
1143         mutex = (ldap_pvt_thread_mutex_t *) LDAP_MALLOC(
1144                 sizeof(ldap_pvt_thread_mutex_t) );
1145
1146         if ( ldap_pvt_thread_mutex_init( mutex ) == 0 ) {
1147                 return mutex;
1148         }
1149 #ifndef LDAP_DEBUG_R_SASL
1150         assert( 0 );
1151 #endif /* !LDAP_DEBUG_R_SASL */
1152         return NULL;
1153 }
1154
1155 int ldap_pvt_sasl_mutex_lock(void *mutex)
1156 {
1157 #ifdef LDAP_DEBUG_R_SASL
1158         if ( mutex == NULL ) {
1159                 return SASL_OK;
1160         }
1161 #else /* !LDAP_DEBUG_R_SASL */
1162         assert( mutex );
1163 #endif /* !LDAP_DEBUG_R_SASL */
1164         return ldap_pvt_thread_mutex_lock( (ldap_pvt_thread_mutex_t *)mutex )
1165                 ? SASL_FAIL : SASL_OK;
1166 }
1167
1168 int ldap_pvt_sasl_mutex_unlock(void *mutex)
1169 {
1170 #ifdef LDAP_DEBUG_R_SASL
1171         if ( mutex == NULL ) {
1172                 return SASL_OK;
1173         }
1174 #else /* !LDAP_DEBUG_R_SASL */
1175         assert( mutex );
1176 #endif /* !LDAP_DEBUG_R_SASL */
1177         return ldap_pvt_thread_mutex_unlock( (ldap_pvt_thread_mutex_t *)mutex )
1178                 ? SASL_FAIL : SASL_OK;
1179 }
1180
1181 void ldap_pvt_sasl_mutex_dispose(void *mutex)
1182 {
1183 #ifdef LDAP_DEBUG_R_SASL
1184         if ( mutex == NULL ) {
1185                 return;
1186         }
1187 #else /* !LDAP_DEBUG_R_SASL */
1188         assert( mutex );
1189 #endif /* !LDAP_DEBUG_R_SASL */
1190         (void) ldap_pvt_thread_mutex_destroy( (ldap_pvt_thread_mutex_t *)mutex );
1191         LDAP_FREE( mutex );
1192 }
1193 #endif
1194
1195 #else
1196 int ldap_int_sasl_init( void )
1197 { return LDAP_SUCCESS; }
1198
1199 int ldap_int_sasl_close( LDAP *ld, LDAPConn *lc )
1200 { return LDAP_SUCCESS; }
1201
1202 int
1203 ldap_int_sasl_bind(
1204         LDAP                    *ld,
1205         const char              *dn,
1206         const char              *mechs,
1207         LDAPControl             **sctrls,
1208         LDAPControl             **cctrls,
1209         unsigned                flags,
1210         LDAP_SASL_INTERACT_PROC *interact,
1211         void * defaults )
1212 { return LDAP_NOT_SUPPORTED; }
1213
1214 int
1215 ldap_int_sasl_external(
1216         LDAP *ld,
1217         LDAPConn *conn,
1218         const char * authid,
1219         ber_len_t ssf )
1220 { return LDAP_SUCCESS; }
1221
1222 #endif /* HAVE_CYRUS_SASL */