Logo Search packages:      
Sourcecode: openldap version File versions

cyrus.c

/* $OpenLDAP: pkg/ldap/libraries/libldap/cyrus.c,v 1.133.2.8 2008/02/11 23:26:41 kurt Exp $ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1998-2008 The OpenLDAP Foundation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */

#include "portable.h"

#include <stdio.h>

#include <ac/socket.h>
#include <ac/stdlib.h>
#include <ac/string.h>
#include <ac/time.h>
#include <ac/errno.h>
#include <ac/ctype.h>
#include <ac/unistd.h>

#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif

#include "ldap-int.h"

#ifdef HAVE_CYRUS_SASL

#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif

#ifndef INT_MAX
#define     INT_MAX     2147483647  /* 32 bit signed max */
#endif

#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_t ldap_int_sasl_mutex;
#endif

#ifdef HAVE_SASL_SASL_H
#include <sasl/sasl.h>
#else
#include <sasl.h>
#endif

#if SASL_VERSION_MAJOR >= 2
#define SASL_CONST const
#else
#define SASL_CONST
#endif

/*
* Various Cyrus SASL related stuff.
*/

static const sasl_callback_t client_callbacks[] = {
#ifdef SASL_CB_GETREALM
      { SASL_CB_GETREALM, NULL, NULL },
#endif
      { SASL_CB_USER, NULL, NULL },
      { SASL_CB_AUTHNAME, NULL, NULL },
      { SASL_CB_PASS, NULL, NULL },
      { SASL_CB_ECHOPROMPT, NULL, NULL },
      { SASL_CB_NOECHOPROMPT, NULL, NULL },
      { SASL_CB_LIST_END, NULL, NULL }
};

int ldap_int_sasl_init( void )
{
      /* XXX not threadsafe */
      static int sasl_initialized = 0;

#ifdef HAVE_SASL_VERSION
      /* stringify the version number, sasl.h doesn't do it for us */
#define VSTR0(maj, min, pat)  #maj "." #min "." #pat
#define VSTR(maj, min, pat)   VSTR0(maj, min, pat)
#define SASL_VERSION_STRING   VSTR(SASL_VERSION_MAJOR, SASL_VERSION_MINOR, \
                        SASL_VERSION_STEP)
      { int rc;
      sasl_version( NULL, &rc );
      if ( ((rc >> 16) != ((SASL_VERSION_MAJOR << 8)|SASL_VERSION_MINOR)) ||
            (rc & 0xffff) < SASL_VERSION_STEP) {
            char version[sizeof("xxx.xxx.xxxxx")];
            sprintf( version, "%u.%d.%d", (unsigned)rc >> 24, (rc >> 16) & 0xff,
                  rc & 0xffff );

            Debug( LDAP_DEBUG_ANY,
            "ldap_int_sasl_init: SASL library version mismatch:"
            " expected " SASL_VERSION_STRING ","
            " got %s\n", version, 0, 0 );
            return -1;
      }
      }
#endif
      if ( sasl_initialized ) {
            return 0;
      }

/* SASL 2 takes care of its own memory completely internally */
#if SASL_VERSION_MAJOR < 2 && !defined(CSRIMALLOC)
      sasl_set_alloc(
            ber_memalloc,
            ber_memcalloc,
            ber_memrealloc,
            ber_memfree );
#endif /* CSRIMALLOC */

#ifdef LDAP_R_COMPILE
      sasl_set_mutex(
            ldap_pvt_sasl_mutex_new,
            ldap_pvt_sasl_mutex_lock,
            ldap_pvt_sasl_mutex_unlock,    
            ldap_pvt_sasl_mutex_dispose );    
#endif

      if ( sasl_client_init( NULL ) == SASL_OK ) {
            sasl_initialized = 1;
            return 0;
      }

#if SASL_VERSION_MAJOR < 2
      /* A no-op to make sure we link with Cyrus 1.5 */
      sasl_client_auth( NULL, NULL, NULL, 0, NULL, NULL );
#endif
      return -1;
}

/*
 * SASL encryption support for LBER Sockbufs
 */

struct sb_sasl_data {
      sasl_conn_t       *sasl_context;
      unsigned          *sasl_maxbuf;
      Sockbuf_Buf       sec_buf_in;
      Sockbuf_Buf       buf_in;
      Sockbuf_Buf       buf_out;
};

static int
sb_sasl_setup( Sockbuf_IO_Desc *sbiod, void *arg )
{
      struct sb_sasl_data     *p;

      assert( sbiod != NULL );

      p = LBER_MALLOC( sizeof( *p ) );
      if ( p == NULL )
            return -1;
      p->sasl_context = (sasl_conn_t *)arg;
      ber_pvt_sb_buf_init( &p->sec_buf_in );
      ber_pvt_sb_buf_init( &p->buf_in );
      ber_pvt_sb_buf_init( &p->buf_out );
      if ( ber_pvt_sb_grow_buffer( &p->sec_buf_in, SASL_MIN_BUFF_SIZE ) < 0 ) {
            LBER_FREE( p );
            sock_errset(ENOMEM);
            return -1;
      }
      sasl_getprop( p->sasl_context, SASL_MAXOUTBUF,
            (SASL_CONST void **)(char *) &p->sasl_maxbuf );
          
      sbiod->sbiod_pvt = p;

      return 0;
}

static int
sb_sasl_remove( Sockbuf_IO_Desc *sbiod )
{
      struct sb_sasl_data     *p;

      assert( sbiod != NULL );
      
      p = (struct sb_sasl_data *)sbiod->sbiod_pvt;
#if SASL_VERSION_MAJOR >= 2
      /*
       * SASLv2 encode/decode buffers are managed by
       * libsasl2. Ensure they are not freed by liblber.
       */
      p->buf_in.buf_base = NULL;
      p->buf_out.buf_base = NULL;
#endif
      ber_pvt_sb_buf_destroy( &p->sec_buf_in );
      ber_pvt_sb_buf_destroy( &p->buf_in );
      ber_pvt_sb_buf_destroy( &p->buf_out );
      LBER_FREE( p );
      sbiod->sbiod_pvt = NULL;
      return 0;
}

static ber_len_t
sb_sasl_pkt_length( const unsigned char *buf, int debuglevel )
{
      ber_len_t         size;

      assert( buf != NULL );

      size = buf[0] << 24
            | buf[1] << 16
            | buf[2] << 8
            | buf[3];

      if ( size > SASL_MAX_BUFF_SIZE ) {
            /* somebody is trying to mess me up. */
            ber_log_printf( LDAP_DEBUG_ANY, debuglevel,
                  "sb_sasl_pkt_length: received illegal packet length "
                  "of %lu bytes\n", (unsigned long)size );      
            size = 16; /* this should lead to an error. */
      }

      return size + 4; /* include the size !!! */
}

/* Drop a processed packet from the input buffer */
static void
sb_sasl_drop_packet ( Sockbuf_Buf *sec_buf_in, int debuglevel )
{
      ber_slen_t              len;

      len = sec_buf_in->buf_ptr - sec_buf_in->buf_end;
      if ( len > 0 )
            AC_MEMCPY( sec_buf_in->buf_base, sec_buf_in->buf_base +
                  sec_buf_in->buf_end, len );
   
      if ( len >= 4 ) {
            sec_buf_in->buf_end = sb_sasl_pkt_length(
                  (unsigned char *) sec_buf_in->buf_base, debuglevel);
      }
      else {
            sec_buf_in->buf_end = 0;
      }
      sec_buf_in->buf_ptr = len;
}

static ber_slen_t
sb_sasl_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
{
      struct sb_sasl_data     *p;
      ber_slen_t        ret, bufptr;
   
      assert( sbiod != NULL );
      assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );

      p = (struct sb_sasl_data *)sbiod->sbiod_pvt;

      /* Are there anything left in the buffer? */
      ret = ber_pvt_sb_copy_out( &p->buf_in, buf, len );
      bufptr = ret;
      len -= ret;

      if ( len == 0 )
            return bufptr;

#if SASL_VERSION_MAJOR >= 2
      ber_pvt_sb_buf_init( &p->buf_in );
#else
      ber_pvt_sb_buf_destroy( &p->buf_in );
#endif

      /* Read the length of the packet */
      while ( p->sec_buf_in.buf_ptr < 4 ) {
            ret = LBER_SBIOD_READ_NEXT( sbiod, p->sec_buf_in.buf_base +
                  p->sec_buf_in.buf_ptr,
                  4 - p->sec_buf_in.buf_ptr );
#ifdef EINTR
            if ( ( ret < 0 ) && ( errno == EINTR ) )
                  continue;
#endif
            if ( ret <= 0 )
                  return bufptr ? bufptr : ret;

            p->sec_buf_in.buf_ptr += ret;
      }

      /* The new packet always starts at p->sec_buf_in.buf_base */
      ret = sb_sasl_pkt_length( (unsigned char *) p->sec_buf_in.buf_base,
            sbiod->sbiod_sb->sb_debug );

      /* Grow the packet buffer if neccessary */
      if ( ( p->sec_buf_in.buf_size < (ber_len_t) ret ) && 
            ber_pvt_sb_grow_buffer( &p->sec_buf_in, ret ) < 0 )
      {
            sock_errset(ENOMEM);
            return -1;
      }
      p->sec_buf_in.buf_end = ret;

      /* Did we read the whole encrypted packet? */
      while ( p->sec_buf_in.buf_ptr < p->sec_buf_in.buf_end ) {
            /* No, we have got only a part of it */
            ret = p->sec_buf_in.buf_end - p->sec_buf_in.buf_ptr;

            ret = LBER_SBIOD_READ_NEXT( sbiod, p->sec_buf_in.buf_base +
                  p->sec_buf_in.buf_ptr, ret );
#ifdef EINTR
            if ( ( ret < 0 ) && ( errno == EINTR ) )
                  continue;
#endif
            if ( ret <= 0 )
                  return bufptr ? bufptr : ret;

            p->sec_buf_in.buf_ptr += ret;
      }

      /* Decode the packet */
      {
            unsigned tmpsize = p->buf_in.buf_end;
            ret = sasl_decode( p->sasl_context, p->sec_buf_in.buf_base,
                  p->sec_buf_in.buf_end,
                  (SASL_CONST char **)&p->buf_in.buf_base,
                  (unsigned *)&tmpsize );
            p->buf_in.buf_end = tmpsize;
      }

      /* Drop the packet from the input buffer */
      sb_sasl_drop_packet( &p->sec_buf_in, sbiod->sbiod_sb->sb_debug );

      if ( ret != SASL_OK ) {
            ber_log_printf( LDAP_DEBUG_ANY, sbiod->sbiod_sb->sb_debug,
                  "sb_sasl_read: failed to decode packet: %s\n",
                  sasl_errstring( ret, NULL, NULL ) );
            sock_errset(EIO);
            return -1;
      }
      
      p->buf_in.buf_size = p->buf_in.buf_end;

      bufptr += ber_pvt_sb_copy_out( &p->buf_in, (char*) buf + bufptr, len );

      return bufptr;
}

static ber_slen_t
sb_sasl_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
{
      struct sb_sasl_data     *p;
      int               ret;

      assert( sbiod != NULL );
      assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );

      p = (struct sb_sasl_data *)sbiod->sbiod_pvt;

      /* Are there anything left in the buffer? */
      if ( p->buf_out.buf_ptr != p->buf_out.buf_end ) {
            ret = ber_pvt_sb_do_write( sbiod, &p->buf_out );
            if ( ret < 0 ) return ret;

            /* Still have something left?? */
            if ( p->buf_out.buf_ptr != p->buf_out.buf_end ) {
                  sock_errset(EAGAIN);
                  return -1;
            }
      }

      /* now encode the next packet. */
#if SASL_VERSION_MAJOR >= 2
      ber_pvt_sb_buf_init( &p->buf_out );
#else
      ber_pvt_sb_buf_destroy( &p->buf_out );
#endif
      if ( len > *p->sasl_maxbuf - 100 ) {
            len = *p->sasl_maxbuf - 100;  /* For safety margin */
      }

      {
            unsigned tmpsize = p->buf_out.buf_size;
            ret = sasl_encode( p->sasl_context, buf, len,
                  (SASL_CONST char **)&p->buf_out.buf_base,
                  &tmpsize );
            p->buf_out.buf_size = tmpsize;
      }

      if ( ret != SASL_OK ) {
            ber_log_printf( LDAP_DEBUG_ANY, sbiod->sbiod_sb->sb_debug,
                  "sb_sasl_write: failed to encode packet: %s\n",
                  sasl_errstring( ret, NULL, NULL ) );
            sock_errset(EIO);
            return -1;
      }
      p->buf_out.buf_end = p->buf_out.buf_size;

      ret = ber_pvt_sb_do_write( sbiod, &p->buf_out );

      /* return number of bytes encoded, not written, to ensure
       * no byte is encoded twice (even if only sent once).
       */
      return len;
}

static int
sb_sasl_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
{
      struct sb_sasl_data     *p;

      p = (struct sb_sasl_data *)sbiod->sbiod_pvt;

      if ( opt == LBER_SB_OPT_DATA_READY ) {
            if ( p->buf_in.buf_ptr != p->buf_in.buf_end ) return 1;
      }
      
      return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
}

Sockbuf_IO ldap_pvt_sockbuf_io_sasl = {
      sb_sasl_setup,          /* sbi_setup */
      sb_sasl_remove,         /* sbi_remove */
      sb_sasl_ctrl,           /* sbi_ctrl */
      sb_sasl_read,           /* sbi_read */
      sb_sasl_write,          /* sbi_write */
      NULL              /* sbi_close */
};

int ldap_pvt_sasl_install( Sockbuf *sb, void *ctx_arg )
{
      Debug( LDAP_DEBUG_TRACE, "ldap_pvt_sasl_install\n",
            0, 0, 0 );

      /* don't install the stuff unless security has been negotiated */

      if ( !ber_sockbuf_ctrl( sb, LBER_SB_OPT_HAS_IO,
                  &ldap_pvt_sockbuf_io_sasl ) )
      {
#ifdef LDAP_DEBUG
            ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
                  LBER_SBIOD_LEVEL_APPLICATION, (void *)"sasl_" );
#endif
            ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_sasl,
                  LBER_SBIOD_LEVEL_APPLICATION, ctx_arg );
      }

      return LDAP_SUCCESS;
}

void ldap_pvt_sasl_remove( Sockbuf *sb )
{
      ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_sasl,
            LBER_SBIOD_LEVEL_APPLICATION );
#ifdef LDAP_DEBUG
      ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
            LBER_SBIOD_LEVEL_APPLICATION );
#endif
}

static int
sasl_err2ldap( int saslerr )
{
      int rc;

      /* map SASL errors to LDAP API errors returned by:
       *    sasl_client_new()
       *          SASL_OK, SASL_NOMECH, SASL_NOMEM
       *    sasl_client_start()
       *          SASL_OK, SASL_NOMECH, SASL_NOMEM, SASL_INTERACT
       *    sasl_client_step()
       *          SASL_OK, SASL_INTERACT, SASL_BADPROT, SASL_BADSERV
       */

      switch (saslerr) {
            case SASL_CONTINUE:
                  rc = LDAP_MORE_RESULTS_TO_RETURN;
                  break;
            case SASL_INTERACT:
                  rc = LDAP_LOCAL_ERROR;
                  break;
            case SASL_OK:
                  rc = LDAP_SUCCESS;
                  break;
            case SASL_NOMEM:
                  rc = LDAP_NO_MEMORY;
                  break;
            case SASL_NOMECH:
                  rc = LDAP_AUTH_UNKNOWN;
                  break;
            case SASL_BADPROT:
                  rc = LDAP_DECODING_ERROR;
                  break;
            case SASL_BADSERV:
                  rc = LDAP_AUTH_UNKNOWN;
                  break;

            /* other codes */
            case SASL_BADAUTH:
                  rc = LDAP_AUTH_UNKNOWN;
                  break;
            case SASL_NOAUTHZ:
                  rc = LDAP_PARAM_ERROR;
                  break;
            case SASL_FAIL:
                  rc = LDAP_LOCAL_ERROR;
                  break;
            case SASL_TOOWEAK:
            case SASL_ENCRYPT:
                  rc = LDAP_AUTH_UNKNOWN;
                  break;
            default:
                  rc = LDAP_LOCAL_ERROR;
                  break;
      }

      assert( rc == LDAP_SUCCESS || LDAP_API_ERROR( rc ) );
      return rc;
}

int
ldap_int_sasl_open(
      LDAP *ld, 
      LDAPConn *lc,
      const char * host )
{
      int rc;
      sasl_conn_t *ctx;

      assert( lc->lconn_sasl_authctx == NULL );

      if ( host == NULL ) {
            ld->ld_errno = LDAP_LOCAL_ERROR;
            return ld->ld_errno;
      }

      if ( ldap_int_sasl_init() ) {
            ld->ld_errno = LDAP_LOCAL_ERROR;
            return ld->ld_errno;
      }

#if SASL_VERSION_MAJOR >= 2
      rc = sasl_client_new( "ldap", host, NULL, NULL,
            client_callbacks, 0, &ctx );
#else
      rc = sasl_client_new( "ldap", host, client_callbacks,
            SASL_SECURITY_LAYER, &ctx );
#endif

      if ( rc != SASL_OK ) {
            ld->ld_errno = sasl_err2ldap( rc );
            return ld->ld_errno;
      }

      Debug( LDAP_DEBUG_TRACE, "ldap_int_sasl_open: host=%s\n",
            host, 0, 0 );

      lc->lconn_sasl_authctx = ctx;

      return LDAP_SUCCESS;
}

int ldap_int_sasl_close( LDAP *ld, LDAPConn *lc )
{
      sasl_conn_t *ctx = lc->lconn_sasl_authctx;

      if( ctx != NULL ) {
            sasl_dispose( &ctx );
            if ( lc->lconn_sasl_sockctx &&
                  lc->lconn_sasl_authctx != lc->lconn_sasl_sockctx ) {
                  ctx = lc->lconn_sasl_sockctx;
                  sasl_dispose( &ctx );
            }
            lc->lconn_sasl_sockctx = NULL;
            lc->lconn_sasl_authctx = NULL;
      }

      return LDAP_SUCCESS;
}

int
ldap_int_sasl_bind(
      LDAP              *ld,
      const char        *dn,
      const char        *mechs,
      LDAPControl       **sctrls,
      LDAPControl       **cctrls,
      unsigned          flags,
      LDAP_SASL_INTERACT_PROC *interact,
      void * defaults )
{
      char *data;
      const char *mech = NULL;
      const char *pmech = NULL;
      int               saslrc, rc;
      sasl_ssf_t        *ssf = NULL;
      sasl_conn_t *ctx, *oldctx = NULL;
      sasl_interact_t *prompts = NULL;
      unsigned credlen;
      struct berval ccred;
      ber_socket_t            sd;
      void  *ssl;

      Debug( LDAP_DEBUG_TRACE, "ldap_int_sasl_bind: %s\n",
            mechs ? mechs : "<null>", 0, 0 );

      /* do a quick !LDAPv3 check... ldap_sasl_bind will do the rest. */
      if (ld->ld_version < LDAP_VERSION3) {
            ld->ld_errno = LDAP_NOT_SUPPORTED;
            return ld->ld_errno;
      }

      rc = 0;
#ifdef LDAP_R_COMPILE
      ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
#endif
      ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, &sd );

      if ( sd == AC_SOCKET_INVALID ) {
            /* not connected yet */

            rc = ldap_open_defconn( ld );

            if ( rc == 0 ) {
                  ber_sockbuf_ctrl( ld->ld_defconn->lconn_sb,
                        LBER_SB_OPT_GET_FD, &sd );

                  if( sd == AC_SOCKET_INVALID ) {
                        ld->ld_errno = LDAP_LOCAL_ERROR;
                        rc = ld->ld_errno;
                  }
            }
      }   
#ifdef LDAP_R_COMPILE
      ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
#endif
      if( rc != 0 ) return ld->ld_errno;

      oldctx = ld->ld_defconn->lconn_sasl_authctx;

      /* If we already have an authentication context, clear it out */
      if( oldctx ) {
            if ( oldctx != ld->ld_defconn->lconn_sasl_sockctx ) {
                  sasl_dispose( &oldctx );
            }
            ld->ld_defconn->lconn_sasl_authctx = NULL;
      }

      {
            char *saslhost = ldap_host_connected_to( ld->ld_defconn->lconn_sb,
                  "localhost" );
            rc = ldap_int_sasl_open( ld, ld->ld_defconn, saslhost );
            LDAP_FREE( saslhost );
      }

      if ( rc != LDAP_SUCCESS ) return rc;

      ctx = ld->ld_defconn->lconn_sasl_authctx;

      /* Check for TLS */
      ssl = ldap_pvt_tls_sb_ctx( ld->ld_defconn->lconn_sb );
      if ( ssl ) {
            struct berval authid = BER_BVNULL;
            ber_len_t fac;

            fac = ldap_pvt_tls_get_strength( ssl );
            /* failure is OK, we just can't use SASL EXTERNAL */
            (void) ldap_pvt_tls_get_my_dn( ssl, &authid, NULL, 0 );

            (void) ldap_int_sasl_external( ld, ld->ld_defconn, authid.bv_val, fac );
            LDAP_FREE( authid.bv_val );
      }

#if !defined(_WIN32)
      /* Check for local */
      if ( ldap_pvt_url_scheme2proto(
            ld->ld_defconn->lconn_server->lud_scheme ) == LDAP_PROTO_IPC )
      {
            char authid[sizeof("gidNumber=4294967295+uidNumber=4294967295,"
                  "cn=peercred,cn=external,cn=auth")];
            sprintf( authid, "gidNumber=%u+uidNumber=%u,"
                  "cn=peercred,cn=external,cn=auth",
                  getegid(), geteuid() );
            (void) ldap_int_sasl_external( ld, ld->ld_defconn, authid,
                  LDAP_PVT_SASL_LOCAL_SSF );
      }
#endif

      /* (re)set security properties */
      sasl_setprop( ctx, SASL_SEC_PROPS,
            &ld->ld_options.ldo_sasl_secprops );

      ccred.bv_val = NULL;
      ccred.bv_len = 0;

      do {
            saslrc = sasl_client_start( ctx,
                  mechs,
#if SASL_VERSION_MAJOR < 2
                  NULL,
#endif
                  &prompts,
                  (SASL_CONST char **)&ccred.bv_val,
                  &credlen,
                  &mech );

            if( pmech == NULL && mech != NULL ) {
                  pmech = mech;

                  if( flags != LDAP_SASL_QUIET ) {
                        fprintf(stderr,
                              "SASL/%s authentication started\n",
                              pmech );
                  }
            }

            if( saslrc == SASL_INTERACT ) {
                  int res;
                  if( !interact ) break;
                  res = (interact)( ld, flags, defaults, prompts );

                  if( res != LDAP_SUCCESS ) break;
            }
      } while ( saslrc == SASL_INTERACT );

      ccred.bv_len = credlen;

      if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
            rc = ld->ld_errno = sasl_err2ldap( saslrc );
#if SASL_VERSION_MAJOR >= 2
            if ( ld->ld_error ) {
                  LDAP_FREE( ld->ld_error );
            }
            ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
#endif
            goto done;
      }

      do {
            struct berval *scred;
            unsigned credlen;

            scred = NULL;

            rc = ldap_sasl_bind_s( ld, dn, mech, &ccred, sctrls, cctrls,
                  &scred );

            if ( ccred.bv_val != NULL ) {
#if SASL_VERSION_MAJOR < 2
                  LDAP_FREE( ccred.bv_val );
#endif
                  ccred.bv_val = NULL;
            }

            if ( rc != LDAP_SUCCESS && rc != LDAP_SASL_BIND_IN_PROGRESS ) {
                  if( scred ) {
                        /* and server provided us with data? */
                        Debug( LDAP_DEBUG_TRACE,
                              "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
                              rc, saslrc, scred ? scred->bv_len : -1 );
                        ber_bvfree( scred );
                        scred = NULL;
                  }
                  rc = ld->ld_errno;
                  goto done;
            }

            if( rc == LDAP_SUCCESS && saslrc == SASL_OK ) {
                  /* we're done, no need to step */
                  if( scred ) {
                        /* but we got additional data? */
#define KLUDGE_FOR_MSAD
#ifdef      KLUDGE_FOR_MSAD
                        /*
                         * MSAD provides empty additional data in violation of LDAP
                         * technical specifications.  As no existing SASL mechanism
                         * allows empty data with an outcome message, just ignore it
                         * for now.  Hopefully MS will fix their bug before someone
                         * defines a mechanism with possibly empty additional data.
                         */
                        if( scred->bv_len == 0 ) {
                              Debug( LDAP_DEBUG_ANY,
                                    "ldap_int_sasl_bind: ignoring "
                                          " bogus empty data provided with SASL outcome message.\n",
                                    rc, saslrc, scred->bv_len );
                              ber_bvfree( scred );
                        } else
#endif
                        {
                              Debug( LDAP_DEBUG_TRACE,
                                    "ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
                                    rc, saslrc, scred->bv_len );
                              rc = ld->ld_errno = LDAP_LOCAL_ERROR;
                              ber_bvfree( scred );
                              goto done;
                        }
                  }
                  break;
            }

            do {
                  if( ! scred ) {
                        /* no data! */
                        Debug( LDAP_DEBUG_TRACE,
                              "ldap_int_sasl_bind: no data in step!\n",
                              0, 0, 0 );
                  }

                  saslrc = sasl_client_step( ctx,
                        (scred == NULL) ? NULL : scred->bv_val,
                        (scred == NULL) ? 0 : scred->bv_len,
                        &prompts,
                        (SASL_CONST char **)&ccred.bv_val,
                        &credlen );

                  Debug( LDAP_DEBUG_TRACE, "sasl_client_step: %d\n",
                        saslrc, 0, 0 );

                  if( saslrc == SASL_INTERACT ) {
                        int res;
                        if( !interact ) break;
                        res = (interact)( ld, flags, defaults, prompts );
                        if( res != LDAP_SUCCESS ) break;
                  }
            } while ( saslrc == SASL_INTERACT );

            ccred.bv_len = credlen;
            ber_bvfree( scred );

            if ( (saslrc != SASL_OK) && (saslrc != SASL_CONTINUE) ) {
                  ld->ld_errno = sasl_err2ldap( saslrc );
#if SASL_VERSION_MAJOR >= 2
                  if ( ld->ld_error ) {
                        LDAP_FREE( ld->ld_error );
                  }
                  ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
#endif
                  rc = ld->ld_errno;
                  goto done;
            }
      } while ( rc == LDAP_SASL_BIND_IN_PROGRESS );

      if ( rc != LDAP_SUCCESS ) goto done;

      if ( saslrc != SASL_OK ) {
#if SASL_VERSION_MAJOR >= 2
            if ( ld->ld_error ) {
                  LDAP_FREE( ld->ld_error );
            }
            ld->ld_error = LDAP_STRDUP( sasl_errdetail( ctx ) );
#endif
            rc = ld->ld_errno = sasl_err2ldap( saslrc );
            goto done;
      }

      if( flags != LDAP_SASL_QUIET ) {
            saslrc = sasl_getprop( ctx, SASL_USERNAME,
                  (SASL_CONST void **)(char *) &data );
            if( saslrc == SASL_OK && data && *data ) {
                  fprintf( stderr, "SASL username: %s\n", data );
            }

#if SASL_VERSION_MAJOR < 2
            saslrc = sasl_getprop( ctx, SASL_REALM,
                  (SASL_CONST void **) &data );
            if( saslrc == SASL_OK && data && *data ) {
                  fprintf( stderr, "SASL realm: %s\n", data );
            }
#endif
      }

      saslrc = sasl_getprop( ctx, SASL_SSF, (SASL_CONST void **)(char *) &ssf );
      if( saslrc == SASL_OK ) {
            if( flags != LDAP_SASL_QUIET ) {
                  fprintf( stderr, "SASL SSF: %lu\n",
                        (unsigned long) *ssf );
            }

            if( ssf && *ssf ) {
                  if ( ld->ld_defconn->lconn_sasl_sockctx ) {
                        oldctx = ld->ld_defconn->lconn_sasl_sockctx;
                        sasl_dispose( &oldctx );
                        ldap_pvt_sasl_remove( ld->ld_defconn->lconn_sb );
                  }
                  ldap_pvt_sasl_install( ld->ld_defconn->lconn_sb, ctx );
                  ld->ld_defconn->lconn_sasl_sockctx = ctx;

                  if( flags != LDAP_SASL_QUIET ) {
                        fprintf( stderr, "SASL data security layer installed.\n" );
                  }
            }
      }
      ld->ld_defconn->lconn_sasl_authctx = ctx;

done:
      return rc;
}

int
ldap_int_sasl_external(
      LDAP *ld,
      LDAPConn *conn,
      const char * authid,
      ber_len_t ssf )
{
      int sc;
      sasl_conn_t *ctx;
#if SASL_VERSION_MAJOR < 2
      sasl_external_properties_t extprops;
#else
      sasl_ssf_t sasl_ssf = ssf;
#endif

      ctx = conn->lconn_sasl_authctx;

      if ( ctx == NULL ) {
            return LDAP_LOCAL_ERROR;
      }
   
#if SASL_VERSION_MAJOR >= 2
      sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, &sasl_ssf );
      if ( sc == SASL_OK )
            sc = sasl_setprop( ctx, SASL_AUTH_EXTERNAL, authid );
#else
      memset( &extprops, '\0', sizeof(extprops) );
      extprops.ssf = ssf;
      extprops.auth_id = (char *) authid;

      sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
            (void *) &extprops );
#endif

      if ( sc != SASL_OK ) {
            return LDAP_LOCAL_ERROR;
      }

      return LDAP_SUCCESS;
}


#define GOT_MINSSF      1
#define     GOT_MAXSSF  2
#define     GOT_MAXBUF  4

static struct {
      struct berval key;
      int sflag;
      int ival;
      int idef;
} sprops[] = {
      { BER_BVC("none"), 0, 0, 0 },
      { BER_BVC("nodict"), SASL_SEC_NODICTIONARY, 0, 0 },
      { BER_BVC("noplain"), SASL_SEC_NOPLAINTEXT, 0, 0 },
      { BER_BVC("noactive"), SASL_SEC_NOACTIVE, 0, 0 },
      { BER_BVC("passcred"), SASL_SEC_PASS_CREDENTIALS, 0, 0 },
      { BER_BVC("forwardsec"), SASL_SEC_FORWARD_SECRECY, 0, 0 },
      { BER_BVC("noanonymous"), SASL_SEC_NOANONYMOUS, 0, 0 },
      { BER_BVC("minssf="), 0, GOT_MINSSF, 0 },
      { BER_BVC("maxssf="), 0, GOT_MAXSSF, INT_MAX },
      { BER_BVC("maxbufsize="), 0, GOT_MAXBUF, 65536 },
      { BER_BVNULL, 0, 0, 0 }
};

void ldap_pvt_sasl_secprops_unparse(
      sasl_security_properties_t *secprops,
      struct berval *out )
{
      int i, l = 0;
      int comma;
      char *ptr;

      if ( secprops == NULL || out == NULL ) {
            return;
      }

      comma = 0;
      for ( i=0; !BER_BVISNULL( &sprops[i].key ); i++ ) {
            if ( sprops[i].ival ) {
                  int v = 0;

                  switch( sprops[i].ival ) {
                  case GOT_MINSSF: v = secprops->min_ssf; break;
                  case GOT_MAXSSF: v = secprops->max_ssf; break;
                  case GOT_MAXBUF: v = secprops->maxbufsize; break;
                  }
                  /* It is the default, ignore it */
                  if ( v == sprops[i].idef ) continue;

                  l += sprops[i].key.bv_len + 24;
            } else if ( sprops[i].sflag ) {
                  if ( sprops[i].sflag & secprops->security_flags ) {
                        l += sprops[i].key.bv_len;
                  }
            } else if ( secprops->security_flags == 0 ) {
                  l += sprops[i].key.bv_len;
            }
            if ( comma ) l++;
            comma = 1;
      }
      l++;

      out->bv_val = LDAP_MALLOC( l );
      if ( out->bv_val == NULL ) {
            out->bv_len = 0;
            return;
      }

      ptr = out->bv_val;
      comma = 0;
      for ( i=0; !BER_BVISNULL( &sprops[i].key ); i++ ) {
            if ( sprops[i].ival ) {
                  int v = 0;

                  switch( sprops[i].ival ) {
                  case GOT_MINSSF: v = secprops->min_ssf; break;
                  case GOT_MAXSSF: v = secprops->max_ssf; break;
                  case GOT_MAXBUF: v = secprops->maxbufsize; break;
                  }
                  /* It is the default, ignore it */
                  if ( v == sprops[i].idef ) continue;

                  if ( comma ) *ptr++ = ',';
                  ptr += sprintf(ptr, "%s%d", sprops[i].key.bv_val, v );
                  comma = 1;
            } else if ( sprops[i].sflag ) {
                  if ( sprops[i].sflag & secprops->security_flags ) {
                        if ( comma ) *ptr++ = ',';
                        ptr += sprintf(ptr, "%s", sprops[i].key.bv_val );
                        comma = 1;
                  }
            } else if ( secprops->security_flags == 0 ) {
                  if ( comma ) *ptr++ = ',';
                  ptr += sprintf(ptr, "%s", sprops[i].key.bv_val );
                  comma = 1;
            }
      }
      out->bv_len = ptr - out->bv_val;
}

int ldap_pvt_sasl_secprops(
      const char *in,
      sasl_security_properties_t *secprops )
{
      int i, j, l;
      char **props;
      unsigned sflags = 0;
      int got_sflags = 0;
      sasl_ssf_t max_ssf = 0;
      int got_max_ssf = 0;
      sasl_ssf_t min_ssf = 0;
      int got_min_ssf = 0;
      unsigned maxbufsize = 0;
      int got_maxbufsize = 0;

      if( secprops == NULL ) {
            return LDAP_PARAM_ERROR;
      }
      props = ldap_str2charray( in, "," );
      if( props == NULL ) {
            return LDAP_PARAM_ERROR;
      }

      for( i=0; props[i]; i++ ) {
            l = strlen( props[i] );
            for ( j=0; !BER_BVISNULL( &sprops[j].key ); j++ ) {
                  if ( l < sprops[j].key.bv_len ) continue;
                  if ( strncasecmp( props[i], sprops[j].key.bv_val,
                        sprops[j].key.bv_len )) continue;
                  if ( sprops[j].ival ) {
                        unsigned v;
                        char *next = NULL;
                        if ( !isdigit( (unsigned char)props[i][sprops[j].key.bv_len] ))
                              continue;
                        v = strtoul( &props[i][sprops[j].key.bv_len], &next, 10 );
                        if ( next == &props[i][sprops[j].key.bv_len] || next[0] != '\0' ) continue;
                        switch( sprops[j].ival ) {
                        case GOT_MINSSF:
                              min_ssf = v; got_min_ssf++; break;
                        case GOT_MAXSSF:
                              max_ssf = v; got_max_ssf++; break;
                        case GOT_MAXBUF:
                              maxbufsize = v; got_maxbufsize++; break;
                        }
                  } else {
                        if ( props[i][sprops[j].key.bv_len] ) continue;
                        if ( sprops[j].sflag )
                              sflags |= sprops[j].sflag;
                        else
                              sflags = 0;
                        got_sflags++;
                  }
                  break;
            }
            if ( BER_BVISNULL( &sprops[j].key )) {
                  ldap_charray_free( props );
                  return LDAP_NOT_SUPPORTED;
            }
      }

      if(got_sflags) {
            secprops->security_flags = sflags;
      }
      if(got_min_ssf) {
            secprops->min_ssf = min_ssf;
      }
      if(got_max_ssf) {
            secprops->max_ssf = max_ssf;
      }
      if(got_maxbufsize) {
            secprops->maxbufsize = maxbufsize;
      }

      ldap_charray_free( props );
      return LDAP_SUCCESS;
}

int
ldap_int_sasl_config( struct ldapoptions *lo, int option, const char *arg )
{
      int rc;

      switch( option ) {
      case LDAP_OPT_X_SASL_SECPROPS:
            rc = ldap_pvt_sasl_secprops( arg, &lo->ldo_sasl_secprops );
            if( rc == LDAP_SUCCESS ) return 0;
      }

      return -1;
}

int
ldap_int_sasl_get_option( LDAP *ld, int option, void *arg )
{
      if ( ld == NULL )
            return -1;

      switch ( option ) {
            case LDAP_OPT_X_SASL_MECH: {
                  *(char **)arg = ld->ld_options.ldo_def_sasl_mech
                        ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_mech ) : NULL;
            } break;
            case LDAP_OPT_X_SASL_REALM: {
                  *(char **)arg = ld->ld_options.ldo_def_sasl_realm
                        ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_realm ) : NULL;
            } break;
            case LDAP_OPT_X_SASL_AUTHCID: {
                  *(char **)arg = ld->ld_options.ldo_def_sasl_authcid
                        ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_authcid ) : NULL;
            } break;
            case LDAP_OPT_X_SASL_AUTHZID: {
                  *(char **)arg = ld->ld_options.ldo_def_sasl_authzid
                        ? LDAP_STRDUP( ld->ld_options.ldo_def_sasl_authzid ) : NULL;
            } break;

            case LDAP_OPT_X_SASL_SSF: {
                  int sc;
                  sasl_ssf_t  *ssf;
                  sasl_conn_t *ctx;

                  if( ld->ld_defconn == NULL ) {
                        return -1;
                  }

                  ctx = ld->ld_defconn->lconn_sasl_sockctx;

                  if ( ctx == NULL ) {
                        return -1;
                  }

                  sc = sasl_getprop( ctx, SASL_SSF,
                        (SASL_CONST void **)(char *) &ssf );

                  if ( sc != SASL_OK ) {
                        return -1;
                  }

                  *(ber_len_t *)arg = *ssf;
            } break;

            case LDAP_OPT_X_SASL_SSF_EXTERNAL:
                  /* this option is write only */
                  return -1;

            case LDAP_OPT_X_SASL_SSF_MIN:
                  *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.min_ssf;
                  break;
            case LDAP_OPT_X_SASL_SSF_MAX:
                  *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.max_ssf;
                  break;
            case LDAP_OPT_X_SASL_MAXBUFSIZE:
                  *(ber_len_t *)arg = ld->ld_options.ldo_sasl_secprops.maxbufsize;
                  break;

            case LDAP_OPT_X_SASL_SECPROPS:
                  /* this option is write only */
                  return -1;

            default:
                  return -1;
      }
      return 0;
}

int
ldap_int_sasl_set_option( LDAP *ld, int option, void *arg )
{
      if ( ld == NULL || arg == NULL )
            return -1;

      switch ( option ) {
      case LDAP_OPT_X_SASL_SSF:
            /* This option is read-only */
            return -1;

      case LDAP_OPT_X_SASL_SSF_EXTERNAL: {
            int sc;
#if SASL_VERSION_MAJOR < 2
            sasl_external_properties_t extprops;
#else
            sasl_ssf_t sasl_ssf;
#endif
            sasl_conn_t *ctx;

            if( ld->ld_defconn == NULL ) {
                  return -1;
            }

            ctx = ld->ld_defconn->lconn_sasl_authctx;

            if ( ctx == NULL ) {
                  return -1;
            }

#if SASL_VERSION_MAJOR >= 2
            sasl_ssf = * (ber_len_t *)arg;
            sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, &sasl_ssf);
#else
            memset(&extprops, 0L, sizeof(extprops));

            extprops.ssf = * (ber_len_t *) arg;

            sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
                  (void *) &extprops );
#endif

            if ( sc != SASL_OK ) {
                  return -1;
            }
            } break;

      case LDAP_OPT_X_SASL_SSF_MIN:
            ld->ld_options.ldo_sasl_secprops.min_ssf = *(ber_len_t *)arg;
            break;
      case LDAP_OPT_X_SASL_SSF_MAX:
            ld->ld_options.ldo_sasl_secprops.max_ssf = *(ber_len_t *)arg;
            break;
      case LDAP_OPT_X_SASL_MAXBUFSIZE:
            ld->ld_options.ldo_sasl_secprops.maxbufsize = *(ber_len_t *)arg;
            break;

      case LDAP_OPT_X_SASL_SECPROPS: {
            int sc;
            sc = ldap_pvt_sasl_secprops( (char *) arg,
                  &ld->ld_options.ldo_sasl_secprops );

            return sc == LDAP_SUCCESS ? 0 : -1;
            }

      default:
            return -1;
      }
      return 0;
}

#ifdef LDAP_R_COMPILE
#define LDAP_DEBUG_R_SASL
void *ldap_pvt_sasl_mutex_new(void)
{
      ldap_pvt_thread_mutex_t *mutex;

      mutex = (ldap_pvt_thread_mutex_t *) LDAP_CALLOC( 1,
            sizeof(ldap_pvt_thread_mutex_t) );

      if ( ldap_pvt_thread_mutex_init( mutex ) == 0 ) {
            return mutex;
      }
#ifndef LDAP_DEBUG_R_SASL
      assert( 0 );
#endif /* !LDAP_DEBUG_R_SASL */
      return NULL;
}

int ldap_pvt_sasl_mutex_lock(void *mutex)
{
#ifdef LDAP_DEBUG_R_SASL
      if ( mutex == NULL ) {
            return SASL_OK;
      }
#else /* !LDAP_DEBUG_R_SASL */
      assert( mutex != NULL );
#endif /* !LDAP_DEBUG_R_SASL */
      return ldap_pvt_thread_mutex_lock( (ldap_pvt_thread_mutex_t *)mutex )
            ? SASL_FAIL : SASL_OK;
}

int ldap_pvt_sasl_mutex_unlock(void *mutex)
{
#ifdef LDAP_DEBUG_R_SASL
      if ( mutex == NULL ) {
            return SASL_OK;
      }
#else /* !LDAP_DEBUG_R_SASL */
      assert( mutex != NULL );
#endif /* !LDAP_DEBUG_R_SASL */
      return ldap_pvt_thread_mutex_unlock( (ldap_pvt_thread_mutex_t *)mutex )
            ? SASL_FAIL : SASL_OK;
}

void ldap_pvt_sasl_mutex_dispose(void *mutex)
{
#ifdef LDAP_DEBUG_R_SASL
      if ( mutex == NULL ) {
            return;
      }
#else /* !LDAP_DEBUG_R_SASL */
      assert( mutex != NULL );
#endif /* !LDAP_DEBUG_R_SASL */
      (void) ldap_pvt_thread_mutex_destroy( (ldap_pvt_thread_mutex_t *)mutex );
      LDAP_FREE( mutex );
}
#endif

#else
int ldap_int_sasl_init( void )
{ return LDAP_SUCCESS; }

int ldap_int_sasl_close( LDAP *ld, LDAPConn *lc )
{ return LDAP_SUCCESS; }

int
ldap_int_sasl_bind(
      LDAP              *ld,
      const char        *dn,
      const char        *mechs,
      LDAPControl       **sctrls,
      LDAPControl       **cctrls,
      unsigned          flags,
      LDAP_SASL_INTERACT_PROC *interact,
      void * defaults )
{ return LDAP_NOT_SUPPORTED; }

int
ldap_int_sasl_external(
      LDAP *ld,
      LDAPConn *conn,
      const char * authid,
      ber_len_t ssf )
{ return LDAP_SUCCESS; }

#endif /* HAVE_CYRUS_SASL */

Generated by  Doxygen 1.6.0   Back to index