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sasl.c

/* $OpenLDAP: pkg/ldap/servers/slapd/sasl.c,v 1.239.2.12 2008/02/12 00:54:34 quanah 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>
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif

#include <ac/stdlib.h>
#include <ac/string.h>

#include <lber.h>
#include <ldap_log.h>

#include "slap.h"

#ifdef ENABLE_REWRITE
#include <rewrite.h>
#endif

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

# define    SASL_CONST const

#define SASL_VERSION_FULL     ((SASL_VERSION_MAJOR << 16) |\
      (SASL_VERSION_MINOR << 8) | SASL_VERSION_STEP)

static sasl_security_properties_t sasl_secprops;
#elif defined( SLAP_BUILTIN_SASL )
/*
 * built-in SASL implementation
 *    only supports EXTERNAL
 */
typedef struct sasl_ctx {
      slap_ssf_t sc_external_ssf;
      struct berval sc_external_id;
} SASL_CTX;

#endif

#include <lutil.h>

static struct berval ext_bv = BER_BVC( "EXTERNAL" );

#ifdef HAVE_CYRUS_SASL

int
slap_sasl_log(
      void *context,
      int priority,
      const char *message) 
{
      Connection *conn = context;
      int level;
      const char * label;

      if ( message == NULL ) {
            return SASL_BADPARAM;
      }

      switch (priority) {
      case SASL_LOG_NONE:
            level = LDAP_DEBUG_NONE;
            label = "None";
            break;
      case SASL_LOG_ERR:
            level = LDAP_DEBUG_ANY;
            label = "Error";
            break;
      case SASL_LOG_FAIL:
            level = LDAP_DEBUG_ANY;
            label = "Failure";
            break;
      case SASL_LOG_WARN:
            level = LDAP_DEBUG_TRACE;
            label = "Warning";
            break;
      case SASL_LOG_NOTE:
            level = LDAP_DEBUG_TRACE;
            label = "Notice";
            break;
      case SASL_LOG_DEBUG:
            level = LDAP_DEBUG_TRACE;
            label = "Debug";
            break;
      case SASL_LOG_TRACE:
            level = LDAP_DEBUG_TRACE;
            label = "Trace";
            break;
      case SASL_LOG_PASS:
            level = LDAP_DEBUG_TRACE;
            label = "Password Trace";
            break;
      default:
            return SASL_BADPARAM;
      }

      Debug( level, "SASL [conn=%ld] %s: %s\n",
            conn ? conn->c_connid: -1,
            label, message );


      return SASL_OK;
}

static const char *slap_propnames[] = {
      "*slapConn", "*slapAuthcDNlen", "*slapAuthcDN",
      "*slapAuthzDNlen", "*slapAuthzDN", NULL };

static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
static struct berval generic_filterstr = BER_BVC("(objectclass=*)");

#define     SLAP_SASL_PROP_CONN     0
#define     SLAP_SASL_PROP_AUTHCLEN 1
#define     SLAP_SASL_PROP_AUTHC    2
#define     SLAP_SASL_PROP_AUTHZLEN 3
#define     SLAP_SASL_PROP_AUTHZ    4
#define     SLAP_SASL_PROP_COUNT    5     /* Number of properties we used */

typedef struct lookup_info {
      int flags;
      const struct propval *list;
      sasl_server_params_t *sparams;
} lookup_info;

static slap_response sasl_ap_lookup;

static struct berval sc_cleartext = BER_BVC("{CLEARTEXT}");

static int
sasl_ap_lookup( Operation *op, SlapReply *rs )
{
      BerVarray bv;
      AttributeDescription *ad;
      Attribute *a;
      const char *text;
      int rc, i;
      lookup_info *sl = (lookup_info *)op->o_callback->sc_private;

      if (rs->sr_type != REP_SEARCH) return 0;

      for( i = 0; sl->list[i].name; i++ ) {
            const char *name = sl->list[i].name;

            if ( name[0] == '*' ) {
                  if ( sl->flags & SASL_AUXPROP_AUTHZID ) continue;
                  /* Skip our private properties */
                  if ( !strcmp( name, slap_propnames[0] )) {
                        i += SLAP_SASL_PROP_COUNT - 1;
                        continue;
                  }
                  name++;
            } else if ( !(sl->flags & SASL_AUXPROP_AUTHZID ) )
                  continue;

            if ( sl->list[i].values ) {
                  if ( !(sl->flags & SASL_AUXPROP_OVERRIDE) ) continue;
            }
            ad = NULL;
            rc = slap_str2ad( name, &ad, &text );
            if ( rc != LDAP_SUCCESS ) {
                  Debug( LDAP_DEBUG_TRACE,
                        "slap_ap_lookup: str2ad(%s): %s\n", name, text, 0 );
                  continue;
            }

            /* If it's the rootdn and a rootpw was present, we already set
             * it so don't override it here.
             */
            if ( ad == slap_schema.si_ad_userPassword && sl->list[i].values && 
                  be_isroot_dn( op->o_bd, &op->o_req_ndn ))
                  continue;

            a = attr_find( rs->sr_entry->e_attrs, ad );
            if ( !a ) continue;
            if ( ! access_allowed( op, rs->sr_entry, ad, NULL, ACL_AUTH, NULL ) ) {
                  continue;
            }
            if ( sl->list[i].values && ( sl->flags & SASL_AUXPROP_OVERRIDE ) ) {
                  sl->sparams->utils->prop_erase( sl->sparams->propctx,
                  sl->list[i].name );
            }
            for ( bv = a->a_vals; bv->bv_val; bv++ ) {
                  /* ITS#3846 don't give hashed passwords to SASL */
                  if ( ad == slap_schema.si_ad_userPassword &&
                        bv->bv_val[0] == '{' /*}*/ )
                  {
                        if ( lutil_passwd_scheme( bv->bv_val ) ) {
                              /* If it's not a recognized scheme, just assume it's
                               * a cleartext password that happened to include brackets.
                               *
                               * If it's a recognized scheme, skip this value, unless the
                               * scheme is {CLEARTEXT}. In that case, skip over the
                               * scheme name and use the remainder. If there is nothing
                               * past the scheme name, skip this value.
                               */
#ifdef SLAPD_CLEARTEXT
                              if ( !strncasecmp( bv->bv_val, sc_cleartext.bv_val,
                                    sc_cleartext.bv_len )) {
                                    struct berval cbv;
                                    cbv.bv_len = bv->bv_len - sc_cleartext.bv_len;
                                    if ( cbv.bv_len > 0 ) {
                                          cbv.bv_val = bv->bv_val + sc_cleartext.bv_len;
                                          sl->sparams->utils->prop_set( sl->sparams->propctx,
                                                sl->list[i].name, cbv.bv_val, cbv.bv_len );
                                    }
                              }
#endif
                              continue;
                        }
                  }
                  sl->sparams->utils->prop_set( sl->sparams->propctx,
                        sl->list[i].name, bv->bv_val, bv->bv_len );
            }
      }
      return LDAP_SUCCESS;
}

static void
slap_auxprop_lookup(
      void *glob_context,
      sasl_server_params_t *sparams,
      unsigned flags,
      const char *user,
      unsigned ulen)
{
      Operation op = {0};
      int i, doit = 0;
      Connection *conn = NULL;
      lookup_info sl;

      sl.list = sparams->utils->prop_get( sparams->propctx );
      sl.sparams = sparams;
      sl.flags = flags;

      /* Find our DN and conn first */
      for( i = 0; sl.list[i].name; i++ ) {
            if ( sl.list[i].name[0] == '*' ) {
                  if ( !strcmp( sl.list[i].name, slap_propnames[SLAP_SASL_PROP_CONN] ) ) {
                        if ( sl.list[i].values && sl.list[i].values[0] )
                              AC_MEMCPY( &conn, sl.list[i].values[0], sizeof( conn ) );
                        continue;
                  }
                  if ( flags & SASL_AUXPROP_AUTHZID ) {
                        if ( !strcmp( sl.list[i].name, slap_propnames[SLAP_SASL_PROP_AUTHZLEN] )) {
                              if ( sl.list[i].values && sl.list[i].values[0] )
                                    AC_MEMCPY( &op.o_req_ndn.bv_len, sl.list[i].values[0],
                                          sizeof( op.o_req_ndn.bv_len ) );
                        } else if ( !strcmp( sl.list[i].name, slap_propnames[SLAP_SASL_PROP_AUTHZ] )) {
                              if ( sl.list[i].values )
                                    op.o_req_ndn.bv_val = (char *)sl.list[i].values[0];
                              break;
                        }
                  }

                  if ( !strcmp( sl.list[i].name, slap_propnames[SLAP_SASL_PROP_AUTHCLEN] )) {
                        if ( sl.list[i].values && sl.list[i].values[0] )
                              AC_MEMCPY( &op.o_req_ndn.bv_len, sl.list[i].values[0],
                                    sizeof( op.o_req_ndn.bv_len ) );
                  } else if ( !strcmp( sl.list[i].name, slap_propnames[SLAP_SASL_PROP_AUTHC] ) ) {
                        if ( sl.list[i].values ) {
                              op.o_req_ndn.bv_val = (char *)sl.list[i].values[0];
                              if ( !(flags & SASL_AUXPROP_AUTHZID) )
                                    break;
                        }
                  }
            }
      }

      /* Now see what else needs to be fetched */
      for( i = 0; sl.list[i].name; i++ ) {
            const char *name = sl.list[i].name;

            if ( name[0] == '*' ) {
                  if ( flags & SASL_AUXPROP_AUTHZID ) continue;
                  /* Skip our private properties */
                  if ( !strcmp( name, slap_propnames[0] )) {
                        i += SLAP_SASL_PROP_COUNT - 1;
                        continue;
                  }
                  name++;
            } else if ( !(flags & SASL_AUXPROP_AUTHZID ) )
                  continue;

            if ( sl.list[i].values ) {
                  if ( !(flags & SASL_AUXPROP_OVERRIDE) ) continue;
            }
            doit = 1;
            break;
      }

      if (doit) {
            slap_callback cb = { NULL, sasl_ap_lookup, NULL, NULL };

            cb.sc_private = &sl;

            op.o_bd = select_backend( &op.o_req_ndn, 1 );

            if ( op.o_bd ) {
                  /* For rootdn, see if we can use the rootpw */
                  if ( be_isroot_dn( op.o_bd, &op.o_req_ndn ) &&
                        !BER_BVISEMPTY( &op.o_bd->be_rootpw )) {
                        struct berval cbv = BER_BVNULL;

                        /* If there's a recognized scheme, see if it's CLEARTEXT */
                        if ( lutil_passwd_scheme( op.o_bd->be_rootpw.bv_val )) {
                              if ( !strncasecmp( op.o_bd->be_rootpw.bv_val,
                                    sc_cleartext.bv_val, sc_cleartext.bv_len )) {

                                    /* If it's CLEARTEXT, skip past scheme spec */
                                    cbv.bv_len = op.o_bd->be_rootpw.bv_len -
                                          sc_cleartext.bv_len;
                                    if ( cbv.bv_len ) {
                                          cbv.bv_val = op.o_bd->be_rootpw.bv_val +
                                                sc_cleartext.bv_len;
                                    }
                              }
                        /* No scheme, use the whole value */
                        } else {
                              cbv = op.o_bd->be_rootpw;
                        }
                        if ( !BER_BVISEMPTY( &cbv )) {
                              for( i = 0; sl.list[i].name; i++ ) {
                                    const char *name = sl.list[i].name;

                                    if ( name[0] == '*' ) {
                                          if ( flags & SASL_AUXPROP_AUTHZID ) continue;
                                                name++;
                                    } else if ( !(flags & SASL_AUXPROP_AUTHZID ) )
                                          continue;

                                    if ( !strcasecmp(name,"userPassword") ) {
                                          sl.sparams->utils->prop_set( sl.sparams->propctx,
                                                sl.list[i].name, cbv.bv_val, cbv.bv_len );
                                          break;
                                    }
                              }
                        }
                  }

                  if ( op.o_bd->be_search ) {
                        SlapReply rs = {REP_RESULT};
                        op.o_hdr = conn->c_sasl_bindop->o_hdr;
                        op.o_tag = LDAP_REQ_SEARCH;
                        op.o_dn = conn->c_ndn;
                        op.o_ndn = conn->c_ndn;
                        op.o_callback = &cb;
                        slap_op_time( &op.o_time, &op.o_tincr );
                        op.o_do_not_cache = 1;
                        op.o_is_auth_check = 1;
                        op.o_req_dn = op.o_req_ndn;
                        op.ors_scope = LDAP_SCOPE_BASE;
                        op.ors_deref = LDAP_DEREF_NEVER;
                        op.ors_tlimit = SLAP_NO_LIMIT;
                        op.ors_slimit = 1;
                        op.ors_filter = &generic_filter;
                        op.ors_filterstr = generic_filterstr;
                        /* FIXME: we want all attributes, right? */
                        op.ors_attrs = NULL;

                        op.o_bd->be_search( &op, &rs );
                  }
            }
      }
}

#if SASL_VERSION_FULL >= 0x020110
static int
slap_auxprop_store(
      void *glob_context,
      sasl_server_params_t *sparams,
      struct propctx *prctx,
      const char *user,
      unsigned ulen)
{
      Operation op = {0};
      Opheader oph;
      SlapReply rs = {REP_RESULT};
      int rc, i, j;
      Connection *conn = NULL;
      const struct propval *pr;
      Modifications *modlist = NULL, **modtail = &modlist, *mod;
      slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
      char textbuf[SLAP_TEXT_BUFLEN];
      const char *text;
      size_t textlen = sizeof(textbuf);

      /* just checking if we are enabled */
      if (!prctx) return SASL_OK;

      if (!sparams || !user) return SASL_BADPARAM;

      pr = sparams->utils->prop_get( sparams->propctx );

      /* Find our DN and conn first */
      for( i = 0; pr[i].name; i++ ) {
            if ( pr[i].name[0] == '*' ) {
                  if ( !strcmp( pr[i].name, slap_propnames[SLAP_SASL_PROP_CONN] ) ) {
                        if ( pr[i].values && pr[i].values[0] )
                              AC_MEMCPY( &conn, pr[i].values[0], sizeof( conn ) );
                        continue;
                  }
                  if ( !strcmp( pr[i].name, slap_propnames[SLAP_SASL_PROP_AUTHCLEN] )) {
                        if ( pr[i].values && pr[i].values[0] )
                              AC_MEMCPY( &op.o_req_ndn.bv_len, pr[i].values[0],
                                    sizeof( op.o_req_ndn.bv_len ) );
                  } else if ( !strcmp( pr[i].name, slap_propnames[SLAP_SASL_PROP_AUTHC] ) ) {
                        if ( pr[i].values )
                              op.o_req_ndn.bv_val = (char *)pr[i].values[0];
                  }
            }
      }
      if (!conn || !op.o_req_ndn.bv_val) return SASL_BADPARAM;

      op.o_bd = select_backend( &op.o_req_ndn, 1 );

      if ( !op.o_bd || !op.o_bd->be_modify ) return SASL_FAIL;
            
      pr = sparams->utils->prop_get( prctx );
      if (!pr) return SASL_BADPARAM;

      for (i=0; pr[i].name; i++);
      if (!i) return SASL_BADPARAM;

      for (i=0; pr[i].name; i++) {
            mod = (Modifications *)ch_malloc( sizeof(Modifications) );
            mod->sml_op = LDAP_MOD_REPLACE;
            mod->sml_flags = 0;
            ber_str2bv( pr[i].name, 0, 0, &mod->sml_type );
            mod->sml_numvals = pr[i].nvalues;
            mod->sml_values = (struct berval *)ch_malloc( (pr[i].nvalues + 1) *
                  sizeof(struct berval));
            for (j=0; j<pr[i].nvalues; j++) {
                  ber_str2bv( pr[i].values[j], 0, 1, &mod->sml_values[j]);
            }
            BER_BVZERO( &mod->sml_values[j] );
            mod->sml_nvalues = NULL;
            mod->sml_desc = NULL;
            *modtail = mod;
            modtail = &mod->sml_next;
      }
      *modtail = NULL;

      rc = slap_mods_check( &op, modlist, &text, textbuf, textlen, NULL );

      if ( rc == LDAP_SUCCESS ) {
            rc = slap_mods_no_user_mod_check( &op, modlist,
                  &text, textbuf, textlen );

            if ( rc == LDAP_SUCCESS ) {
                  if ( conn->c_sasl_bindop ) {
                        op.o_hdr = conn->c_sasl_bindop->o_hdr;
                  } else {
                        op.o_hdr = &oph;
                        memset( &oph, 0, sizeof(oph) );
                        operation_fake_init( conn, &op, ldap_pvt_thread_pool_context(), 0 );
                  }
                  op.o_tag = LDAP_REQ_MODIFY;
                  op.o_ndn = op.o_req_ndn;
                  op.o_callback = &cb;
                  slap_op_time( &op.o_time, &op.o_tincr );
                  op.o_do_not_cache = 1;
                  op.o_is_auth_check = 1;
                  op.o_req_dn = op.o_req_ndn;
                  op.orm_modlist = modlist;

                  rc = op.o_bd->be_modify( &op, &rs );
            }
      }
      slap_mods_free( modlist, 1 );
      return rc != LDAP_SUCCESS ? SASL_FAIL : SASL_OK;
}
#endif /* SASL_VERSION_FULL >= 2.1.16 */

static sasl_auxprop_plug_t slap_auxprop_plugin = {
      0,    /* Features */
      0,    /* spare */
      NULL, /* glob_context */
      NULL, /* auxprop_free */
      slap_auxprop_lookup,
      "slapd",    /* name */
#if SASL_VERSION_FULL >= 0x020110
      slap_auxprop_store      /* the declaration of this member changed
                         * in cyrus SASL from 2.1.15 to 2.1.16 */
#else
      NULL
#endif
};

static int
slap_auxprop_init(
      const sasl_utils_t *utils,
      int max_version,
      int *out_version,
      sasl_auxprop_plug_t **plug,
      const char *plugname)
{
      if ( !out_version || !plug ) return SASL_BADPARAM;

      if ( max_version < SASL_AUXPROP_PLUG_VERSION ) return SASL_BADVERS;

      *out_version = SASL_AUXPROP_PLUG_VERSION;
      *plug = &slap_auxprop_plugin;
      return SASL_OK;
}

/* Convert a SASL authcid or authzid into a DN. Store the DN in an
 * auxiliary property, so that we can refer to it in sasl_authorize
 * without interfering with anything else. Also, the SASL username
 * buffer is constrained to 256 characters, and our DNs could be
 * much longer (SLAP_LDAPDN_MAXLEN, currently set to 8192)
 */
static int
slap_sasl_canonicalize(
      sasl_conn_t *sconn,
      void *context,
      const char *in,
      unsigned inlen,
      unsigned flags,
      const char *user_realm,
      char *out,
      unsigned out_max,
      unsigned *out_len)
{
      Connection *conn = (Connection *)context;
      struct propctx *props = sasl_auxprop_getctx( sconn );
      struct propval auxvals[ SLAP_SASL_PROP_COUNT ] = { { 0 } };
      struct berval dn;
      int rc, which;
      const char *names[2];
      struct berval     bvin;

      *out_len = 0;

      Debug( LDAP_DEBUG_ARGS, "SASL Canonicalize [conn=%ld]: %s=\"%s\"\n",
            conn ? conn->c_connid : -1,
            (flags & SASL_CU_AUTHID) ? "authcid" : "authzid",
            in ? in : "<empty>");

      /* If name is too big, just truncate. We don't care, we're
       * using DNs, not the usernames.
       */
      if ( inlen > out_max )
            inlen = out_max-1;

      /* This is a Simple Bind using SPASSWD. That means the in-directory
       * userPassword of the Binding user already points at SASL, so it
       * cannot be used to actually satisfy a password comparison. Just
       * ignore it, some other mech will process it.
       */
      if ( !conn->c_sasl_bindop ||
            conn->c_sasl_bindop->orb_method != LDAP_AUTH_SASL ) goto done;

      /* See if we need to add request, can only do it once */
      prop_getnames( props, slap_propnames, auxvals );
      if ( !auxvals[0].name )
            prop_request( props, slap_propnames );

      if ( flags & SASL_CU_AUTHID )
            which = SLAP_SASL_PROP_AUTHCLEN;
      else
            which = SLAP_SASL_PROP_AUTHZLEN;

      /* Need to store the Connection for auxprop_lookup */
      if ( !auxvals[SLAP_SASL_PROP_CONN].values ) {
            names[0] = slap_propnames[SLAP_SASL_PROP_CONN];
            names[1] = NULL;
            prop_set( props, names[0], (char *)&conn, sizeof( conn ) );
      }
            
      /* Already been here? */
      if ( auxvals[which].values )
            goto done;

      /* Normally we require an authzID to have a u: or dn: prefix.
       * However, SASL frequently gives us an authzID that is just
       * an exact copy of the authcID, without a prefix. We need to
       * detect and allow this condition. If SASL calls canonicalize
       * with SASL_CU_AUTHID|SASL_CU_AUTHZID this is a no-brainer.
       * But if it's broken into two calls, we need to remember the
       * authcID so that we can compare the authzID later. We store
       * the authcID temporarily in conn->c_sasl_dn. We necessarily
       * finish Canonicalizing before Authorizing, so there is no
       * conflict with slap_sasl_authorize's use of this temp var.
       *
       * The SASL EXTERNAL mech is backwards from all the other mechs,
       * it does authzID before the authcID. If we see that authzID
       * has already been done, don't do anything special with authcID.
       */
      if ( flags == SASL_CU_AUTHID && !auxvals[SLAP_SASL_PROP_AUTHZ].values ) {
            conn->c_sasl_dn.bv_val = (char *) in;
            conn->c_sasl_dn.bv_len = 0;
      } else if ( flags == SASL_CU_AUTHZID && conn->c_sasl_dn.bv_val ) {
            rc = strcmp( in, conn->c_sasl_dn.bv_val );
            conn->c_sasl_dn.bv_val = NULL;
            /* They were equal, no work needed */
            if ( !rc ) goto done;
      }

      bvin.bv_val = (char *)in;
      bvin.bv_len = inlen;
      rc = slap_sasl_getdn( conn, NULL, &bvin, (char *)user_realm, &dn,
            (flags & SASL_CU_AUTHID) ? SLAP_GETDN_AUTHCID : SLAP_GETDN_AUTHZID );
      if ( rc != LDAP_SUCCESS ) {
            sasl_seterror( sconn, 0, ldap_err2string( rc ) );
            return SASL_NOAUTHZ;
      }

      names[0] = slap_propnames[which];
      names[1] = NULL;
      prop_set( props, names[0], (char *)&dn.bv_len, sizeof( dn.bv_len ) );

      which++;
      names[0] = slap_propnames[which];
      prop_set( props, names[0], dn.bv_val, dn.bv_len );

      Debug( LDAP_DEBUG_ARGS, "SASL Canonicalize [conn=%ld]: %s=\"%s\"\n",
            conn ? conn->c_connid : -1, names[0]+1,
            dn.bv_val ? dn.bv_val : "<EMPTY>" );

      /* Not needed any more, SASL has copied it */
      if ( conn && conn->c_sasl_bindop )
            conn->c_sasl_bindop->o_tmpfree( dn.bv_val, conn->c_sasl_bindop->o_tmpmemctx );

done:
      AC_MEMCPY( out, in, inlen );
      out[inlen] = '\0';

      *out_len = inlen;

      return SASL_OK;
}

static int
slap_sasl_authorize(
      sasl_conn_t *sconn,
      void *context,
      char *requested_user,
      unsigned rlen,
      char *auth_identity,
      unsigned alen,
      const char *def_realm,
      unsigned urlen,
      struct propctx *props)
{
      Connection *conn = (Connection *)context;
      /* actually:
       *    (SLAP_SASL_PROP_COUNT - 1)    because we skip "conn",
       *    + 1                     for NULL termination?
       */
      struct propval auxvals[ SLAP_SASL_PROP_COUNT ] = { { 0 } };
      struct berval authcDN, authzDN = BER_BVNULL;
      int rc;

      /* Simple Binds don't support proxy authorization, ignore it */
      if ( !conn->c_sasl_bindop ||
            conn->c_sasl_bindop->orb_method != LDAP_AUTH_SASL ) return SASL_OK;

      Debug( LDAP_DEBUG_ARGS, "SASL proxy authorize [conn=%ld]: "
            "authcid=\"%s\" authzid=\"%s\"\n",
            conn ? conn->c_connid : -1, auth_identity, requested_user );
      if ( conn->c_sasl_dn.bv_val ) {
            BER_BVZERO( &conn->c_sasl_dn );
      }

      /* Skip SLAP_SASL_PROP_CONN */
      prop_getnames( props, slap_propnames+1, auxvals );
      
      /* Should not happen */
      if ( !auxvals[0].values ) {
            sasl_seterror( sconn, 0, "invalid authcid" );
            return SASL_NOAUTHZ;
      }

      AC_MEMCPY( &authcDN.bv_len, auxvals[0].values[0], sizeof(authcDN.bv_len) );
      authcDN.bv_val = auxvals[1].values ? (char *)auxvals[1].values[0] : NULL;
      conn->c_sasl_dn = authcDN;

      /* Nothing to do if no authzID was given */
      if ( !auxvals[2].name || !auxvals[2].values ) {
            goto ok;
      }
      
      AC_MEMCPY( &authzDN.bv_len, auxvals[2].values[0], sizeof(authzDN.bv_len) );
      authzDN.bv_val = auxvals[3].values ? (char *)auxvals[3].values[0] : NULL;

      rc = slap_sasl_authorized( conn->c_sasl_bindop, &authcDN, &authzDN );
      if ( rc != LDAP_SUCCESS ) {
            Debug( LDAP_DEBUG_TRACE, "SASL Proxy Authorize [conn=%ld]: "
                  "proxy authorization disallowed (%d)\n",
                  (long) (conn ? conn->c_connid : -1), rc, 0 );

            sasl_seterror( sconn, 0, "not authorized" );
            return SASL_NOAUTHZ;
      }

      /* FIXME: we need yet another dup because slap_sasl_getdn()
       * is using the bind operation slab */
      ber_dupbv( &conn->c_sasl_authz_dn, &authzDN );

ok:
      if (conn->c_sasl_bindop) {
            Statslog( LDAP_DEBUG_STATS,
                  "%s BIND authcid=\"%s\" authzid=\"%s\"\n",
                  conn->c_sasl_bindop->o_log_prefix, 
                  auth_identity, requested_user, 0, 0 );
      }

      Debug( LDAP_DEBUG_TRACE, "SASL Authorize [conn=%ld]: "
            " proxy authorization allowed authzDN=\"%s\"\n",
            (long) (conn ? conn->c_connid : -1), 
            authzDN.bv_val ? authzDN.bv_val : "", 0 );
      return SASL_OK;
} 

static int
slap_sasl_err2ldap( int saslerr )
{
      int rc;

      /* map SASL errors to LDAP resultCode returned by:
       *    sasl_server_new()
       *          SASL_OK, SASL_NOMEM
       *    sasl_server_step()
       *          SASL_OK, SASL_CONTINUE, SASL_TRANS, SASL_BADPARAM, SASL_BADPROT,
       *      ...
       *    sasl_server_start()
       *      + SASL_NOMECH
       *    sasl_setprop()
       *          SASL_OK, SASL_BADPARAM
       */

      switch (saslerr) {
            case SASL_OK:
                  rc = LDAP_SUCCESS;
                  break;
            case SASL_CONTINUE:
                  rc = LDAP_SASL_BIND_IN_PROGRESS;
                  break;
            case SASL_FAIL:
            case SASL_NOMEM:
                  rc = LDAP_OTHER;
                  break;
            case SASL_NOMECH:
                  rc = LDAP_AUTH_METHOD_NOT_SUPPORTED;
                  break;
            case SASL_BADAUTH:
            case SASL_NOUSER:
            case SASL_TRANS:
            case SASL_EXPIRED:
                  rc = LDAP_INVALID_CREDENTIALS;
                  break;
            case SASL_NOAUTHZ:
                  rc = LDAP_INSUFFICIENT_ACCESS;
                  break;
            case SASL_TOOWEAK:
            case SASL_ENCRYPT:
                  rc = LDAP_INAPPROPRIATE_AUTH;
                  break;
            case SASL_UNAVAIL:
            case SASL_TRYAGAIN:
                  rc = LDAP_UNAVAILABLE;
                  break;
            case SASL_DISABLED:
                  rc = LDAP_UNWILLING_TO_PERFORM;
                  break;
            default:
                  rc = LDAP_OTHER;
                  break;
      }

      return rc;
}

#ifdef SLAPD_SPASSWD

static struct berval sasl_pwscheme = BER_BVC("{SASL}");

static int chk_sasl(
      const struct berval *sc,
      const struct berval * passwd,
      const struct berval * cred,
      const char **text )
{
      unsigned int i;
      int rtn;
      void *ctx, *sconn = NULL;

      for( i=0; i<cred->bv_len; i++) {
            if(cred->bv_val[i] == '\0') {
                  return LUTIL_PASSWD_ERR;      /* NUL character in password */
            }
      }

      if( cred->bv_val[i] != '\0' ) {
            return LUTIL_PASSWD_ERR;      /* cred must behave like a string */
      }

      for( i=0; i<passwd->bv_len; i++) {
            if(passwd->bv_val[i] == '\0') {
                  return LUTIL_PASSWD_ERR;      /* NUL character in password */
            }
      }

      if( passwd->bv_val[i] != '\0' ) {
            return LUTIL_PASSWD_ERR;      /* passwd must behave like a string */
      }

      rtn = LUTIL_PASSWD_ERR;

      ctx = ldap_pvt_thread_pool_context();
      ldap_pvt_thread_pool_getkey( ctx, (void *)slap_sasl_bind, &sconn, NULL );

      if( sconn != NULL ) {
            int sc;
            sc = sasl_checkpass( sconn,
                  passwd->bv_val, passwd->bv_len,
                  cred->bv_val, cred->bv_len );
            rtn = ( sc != SASL_OK ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
      }

      return rtn;
}
#endif /* SLAPD_SPASSWD */

#endif /* HAVE_CYRUS_SASL */

#ifdef ENABLE_REWRITE

typedef struct slapd_map_data {
      struct berval base;
      struct berval filter;
      AttributeName attrs[2];
      int scope;
} slapd_map_data;

static void *
slapd_rw_config( const char *fname, int lineno, int argc, char **argv )
{
      slapd_map_data *ret = NULL;
      LDAPURLDesc *lud = NULL;
      char *uri;
      AttributeDescription *ad = NULL;
      int rc, flen = 0;
      struct berval dn, ndn;

      if ( argc != 1 ) {
            Debug( LDAP_DEBUG_ANY,
                  "[%s:%d] slapd map needs URI\n",
                  fname, lineno, 0 );
        return NULL;
      }

      uri = argv[0];
      if ( strncasecmp( uri, "uri=", STRLENOF( "uri=" ) ) == 0 ) {
            uri += STRLENOF( "uri=" );
      }

      if ( ldap_url_parse( uri, &lud ) != LDAP_URL_SUCCESS ) {
            Debug( LDAP_DEBUG_ANY,
                  "[%s:%d] illegal URI '%s'\n",
                  fname, lineno, uri );
        return NULL;
      }

      if ( strcasecmp( lud->lud_scheme, "ldap" )) {
            Debug( LDAP_DEBUG_ANY,
                  "[%s:%d] illegal URI scheme '%s'\n",
                  fname, lineno, lud->lud_scheme );
            goto done;
      }

      if (( lud->lud_host && lud->lud_host[0] ) || lud->lud_exts
            || !lud->lud_dn ) {
            Debug( LDAP_DEBUG_ANY,
                  "[%s:%d] illegal URI '%s'\n",
                  fname, lineno, uri );
            goto done;
      }

      if ( lud->lud_attrs ) {
            if ( lud->lud_attrs[1] ) {
                  Debug( LDAP_DEBUG_ANY,
                        "[%s:%d] only one attribute allowed in URI\n",
                        fname, lineno, 0 );
                  goto done;
            }
            if ( strcasecmp( lud->lud_attrs[0], "dn" ) &&
                  strcasecmp( lud->lud_attrs[0], "entryDN" )) {
                  const char *text;
                  rc = slap_str2ad( lud->lud_attrs[0], &ad, &text );
                  if ( rc )
                        goto done;
            }
      }
      ber_str2bv( lud->lud_dn, 0, 0, &dn );
      if ( dnNormalize( 0, NULL, NULL, &dn, &ndn, NULL ))
            goto done;

      if ( lud->lud_filter ) {
            flen = strlen( lud->lud_filter ) + 1;
      }
      ret = ch_malloc( sizeof( slapd_map_data ) + flen );
      ret->base = ndn;
      if ( flen ) {
            ret->filter.bv_val = (char *)(ret+1);
            ret->filter.bv_len = flen - 1;
            strcpy( ret->filter.bv_val, lud->lud_filter );
      } else {
            BER_BVZERO( &ret->filter );
      }
      ret->scope = lud->lud_scope;
      if ( ad ) {
            ret->attrs[0].an_name = ad->ad_cname;
      } else {
            BER_BVZERO( &ret->attrs[0].an_name );
      }
      ret->attrs[0].an_desc = ad;
      BER_BVZERO( &ret->attrs[1].an_name );
done:
      ldap_free_urldesc( lud );
      return ret;
}

struct slapd_rw_info {
      slapd_map_data *si_data;
      struct berval si_val;
};

static int
slapd_rw_cb( Operation *op, SlapReply *rs )
{
      if ( rs->sr_type == REP_SEARCH ) {
            struct slapd_rw_info *si = op->o_callback->sc_private;

            if ( si->si_data->attrs[0].an_desc ) {
                  Attribute *a;

                  a = attr_find( rs->sr_entry->e_attrs,
                        si->si_data->attrs[0].an_desc );
                  if ( a ) {
                        ber_dupbv( &si->si_val, a->a_vals );
                  }
            } else {
                  ber_dupbv( &si->si_val, &rs->sr_entry->e_name );
            }
      }
      return LDAP_SUCCESS;
}

static int
slapd_rw_apply( void *private, const char *filter, struct berval *val )
{
      slapd_map_data *sl = private;
      slap_callback cb = { NULL };
      Connection conn = {0};
      OperationBuffer opbuf;
      Operation *op;
      void *thrctx;
      SlapReply rs = {REP_RESULT};
      struct slapd_rw_info si;
      char *ptr;
      int rc;

      thrctx = ldap_pvt_thread_pool_context();
      connection_fake_init2( &conn, &opbuf, thrctx, 0 );
      op = &opbuf.ob_op;

      op->o_tag = LDAP_REQ_SEARCH;
      op->o_req_dn = op->o_req_ndn = sl->base;
      op->o_bd = select_backend( &op->o_req_ndn, 1 );
      if ( !op->o_bd ) {
            return REWRITE_ERR;
      }
      si.si_data = sl;
      BER_BVZERO( &si.si_val );
      op->ors_scope = sl->scope;
      op->ors_deref = LDAP_DEREF_NEVER;
      op->ors_slimit = 1;
      op->ors_tlimit = SLAP_NO_LIMIT;
      if ( sl->attrs[0].an_desc ) {
            op->ors_attrs = sl->attrs;
      } else {
            op->ors_attrs = slap_anlist_no_attrs;
      }
      if ( filter ) {
            rc = strlen( filter );
      } else {
            rc = 0;
      }
      rc += sl->filter.bv_len;
      ptr = op->ors_filterstr.bv_val = op->o_tmpalloc( rc + 1, op->o_tmpmemctx );
      if ( sl->filter.bv_len ) {
            ptr = lutil_strcopy( ptr, sl->filter.bv_val );
      } else {
            *ptr = '\0';
      }
      if ( filter ) {
            strcpy( ptr, filter );
      }
      op->ors_filter = str2filter_x( op, op->ors_filterstr.bv_val );
      if ( !op->ors_filter ) {
            op->o_tmpfree( op->ors_filterstr.bv_val, op->o_tmpmemctx );
            return REWRITE_ERR;
      }

      op->ors_attrsonly = 0;
      op->o_dn = op->o_bd->be_rootdn;
      op->o_ndn = op->o_bd->be_rootndn;
      op->o_do_not_cache = 1;

      cb.sc_response = slapd_rw_cb;
      cb.sc_private = &si;
      op->o_callback = &cb;

      rc = op->o_bd->be_search( op, &rs );
      if ( rc == LDAP_SUCCESS && !BER_BVISNULL( &si.si_val )) {
            *val = si.si_val;
            rc = REWRITE_SUCCESS;
      } else {
            if ( !BER_BVISNULL( &si.si_val )) {
                  ch_free( si.si_val.bv_val );
            }
            rc = REWRITE_ERR;
      }
      filter_free_x( op, op->ors_filter );
      op->o_tmpfree( op->ors_filterstr.bv_val, op->o_tmpmemctx );
      return rc;
}

static int
slapd_rw_destroy( void *private )
{
      slapd_map_data *md = private;

      assert( private != NULL );

      ch_free( md->base.bv_val );
      ch_free( md->filter.bv_val );
      ch_free( md );

      return 0;
}

static const rewrite_mapper slapd_mapper = {
      "slapd",
      slapd_rw_config,
      slapd_rw_apply,
      slapd_rw_destroy
};
#endif

int slap_sasl_init( void )
{
#ifdef HAVE_CYRUS_SASL
      int rc;
      static sasl_callback_t server_callbacks[] = {
            { SASL_CB_LOG, &slap_sasl_log, NULL },
            { SASL_CB_LIST_END, NULL, NULL }
      };
#endif

#ifdef ENABLE_REWRITE
      rewrite_mapper_register( &slapd_mapper );
#endif

#ifdef HAVE_CYRUS_SASL
#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)

      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, "slap_sasl_init: SASL library version mismatch:"
                  " expected %s, got %s\n",
                  SASL_VERSION_STRING, version, 0 );
            return -1;
      }
#endif

      sasl_set_mutex(
            ldap_pvt_sasl_mutex_new,
            ldap_pvt_sasl_mutex_lock,
            ldap_pvt_sasl_mutex_unlock,
            ldap_pvt_sasl_mutex_dispose );

      generic_filter.f_desc = slap_schema.si_ad_objectClass;

      rc = sasl_auxprop_add_plugin( "slapd", slap_auxprop_init );
      if( rc != SASL_OK ) {
            Debug( LDAP_DEBUG_ANY, "slap_sasl_init: auxprop add plugin failed\n",
                  0, 0, 0 );
            return -1;
      }

      /* should provide callbacks for logging */
      /* server name should be configurable */
      rc = sasl_server_init( server_callbacks, "slapd" );

      if( rc != SASL_OK ) {
            Debug( LDAP_DEBUG_ANY, "slap_sasl_init: server init failed\n",
                  0, 0, 0 );

            return -1;
      }

#ifdef SLAPD_SPASSWD
      lutil_passwd_add( &sasl_pwscheme, chk_sasl, NULL );
#endif

      Debug( LDAP_DEBUG_TRACE, "slap_sasl_init: initialized!\n",
            0, 0, 0 );

      /* default security properties */
      memset( &sasl_secprops, '\0', sizeof(sasl_secprops) );
      sasl_secprops.max_ssf = INT_MAX;
      sasl_secprops.maxbufsize = 65536;
      sasl_secprops.security_flags = SASL_SEC_NOPLAINTEXT|SASL_SEC_NOANONYMOUS;
#endif

      return 0;
}

int slap_sasl_destroy( void )
{
#ifdef HAVE_CYRUS_SASL
      sasl_done();
#endif
      free( sasl_host );
      sasl_host = NULL;

      return 0;
}

static char *
slap_sasl_peer2ipport( struct berval *peer )
{
      int         isv6 = 0;
      char        *ipport, *p,
                  *addr = &peer->bv_val[ STRLENOF( "IP=" ) ];
      ber_len_t   plen = peer->bv_len - STRLENOF( "IP=" );

      /* IPv6? */
      if ( addr[0] == '[' ) {
            isv6 = 1;
            plen--;
      }
      ipport = ch_strdup( &addr[isv6] );

      /* Convert IPv6/IPv4 addresses to address;port syntax. */
      p = strrchr( ipport, ':' );
      if ( p != NULL ) {
            *p = ';';
            if ( isv6 ) {
                  assert( p[-1] == ']' );
                  AC_MEMCPY( &p[-1], p, plen - ( p - ipport ) + 1 );
            }

      } else if ( isv6 ) {
            /* trim ']' */
            plen--;
            assert( addr[plen] == ']' );
            addr[plen] = '\0';
      }

      return ipport;
}

int slap_sasl_open( Connection *conn, int reopen )
{
      int sc = LDAP_SUCCESS;
#ifdef HAVE_CYRUS_SASL
      int cb;

      sasl_conn_t *ctx = NULL;
      sasl_callback_t *session_callbacks;
      char *ipremoteport = NULL, *iplocalport = NULL;

      assert( conn->c_sasl_authctx == NULL );

      if ( !reopen ) {
            assert( conn->c_sasl_extra == NULL );

            session_callbacks =
                  SLAP_CALLOC( 5, sizeof(sasl_callback_t));
            if( session_callbacks == NULL ) {
                  Debug( LDAP_DEBUG_ANY, 
                        "slap_sasl_open: SLAP_MALLOC failed", 0, 0, 0 );
                  return -1;
            }
            conn->c_sasl_extra = session_callbacks;

            session_callbacks[cb=0].id = SASL_CB_LOG;
            session_callbacks[cb].proc = &slap_sasl_log;
            session_callbacks[cb++].context = conn;

            session_callbacks[cb].id = SASL_CB_PROXY_POLICY;
            session_callbacks[cb].proc = &slap_sasl_authorize;
            session_callbacks[cb++].context = conn;

            session_callbacks[cb].id = SASL_CB_CANON_USER;
            session_callbacks[cb].proc = &slap_sasl_canonicalize;
            session_callbacks[cb++].context = conn;

            session_callbacks[cb].id = SASL_CB_LIST_END;
            session_callbacks[cb].proc = NULL;
            session_callbacks[cb++].context = NULL;
      } else {
            session_callbacks = conn->c_sasl_extra;
      }

      conn->c_sasl_layers = 0;

      /* create new SASL context */
      if ( conn->c_sock_name.bv_len != 0 &&
            strncmp( conn->c_sock_name.bv_val, "IP=", STRLENOF( "IP=" ) ) == 0 )
      {
            iplocalport = slap_sasl_peer2ipport( &conn->c_sock_name );
      }

      if ( conn->c_peer_name.bv_len != 0 &&
            strncmp( conn->c_peer_name.bv_val, "IP=", STRLENOF( "IP=" ) ) == 0 )
      {
            ipremoteport = slap_sasl_peer2ipport( &conn->c_peer_name );
      }

      sc = sasl_server_new( "ldap", sasl_host, global_realm,
            iplocalport, ipremoteport, session_callbacks, SASL_SUCCESS_DATA, &ctx );
      if ( iplocalport != NULL ) {
            ch_free( iplocalport );
      }
      if ( ipremoteport != NULL ) {
            ch_free( ipremoteport );
      }

      if( sc != SASL_OK ) {
            Debug( LDAP_DEBUG_ANY, "sasl_server_new failed: %d\n",
                  sc, 0, 0 );

            return -1;
      }

      conn->c_sasl_authctx = ctx;

      if( sc == SASL_OK ) {
            sc = sasl_setprop( ctx,
                  SASL_SEC_PROPS, &sasl_secprops );

            if( sc != SASL_OK ) {
                  Debug( LDAP_DEBUG_ANY, "sasl_setprop failed: %d\n",
                        sc, 0, 0 );

                  slap_sasl_close( conn );
                  return -1;
            }
      }

      sc = slap_sasl_err2ldap( sc );

#elif defined(SLAP_BUILTIN_SASL)
      /* built-in SASL implementation */
      SASL_CTX *ctx = (SASL_CTX *) SLAP_MALLOC(sizeof(SASL_CTX));
      if( ctx == NULL ) return -1;

      ctx->sc_external_ssf = 0;
      BER_BVZERO( &ctx->sc_external_id );

      conn->c_sasl_authctx = ctx;
#endif

      return sc;
}

int slap_sasl_external(
      Connection *conn,
      slap_ssf_t ssf,
      struct berval *auth_id )
{
#ifdef HAVE_CYRUS_SASL
      int sc;
      sasl_conn_t *ctx = conn->c_sasl_authctx;
      sasl_ssf_t sasl_ssf = ssf;

      if ( ctx == NULL ) {
            return LDAP_UNAVAILABLE;
      }

      sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, &sasl_ssf );

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

      sc = sasl_setprop( ctx, SASL_AUTH_EXTERNAL,
            auth_id ? auth_id->bv_val : NULL );

      if ( sc != SASL_OK ) {
            return LDAP_OTHER;
      }
#elif defined(SLAP_BUILTIN_SASL)
      /* built-in SASL implementation */
      SASL_CTX *ctx = conn->c_sasl_authctx;
      if ( ctx == NULL ) return LDAP_UNAVAILABLE;

      ctx->sc_external_ssf = ssf;
      if( auth_id ) {
            ctx->sc_external_id = *auth_id;
            BER_BVZERO( auth_id );
      } else {
            BER_BVZERO( &ctx->sc_external_id );
      }
#endif

      return LDAP_SUCCESS;
}

int slap_sasl_reset( Connection *conn )
{
      return LDAP_SUCCESS;
}

char ** slap_sasl_mechs( Connection *conn )
{
      char **mechs = NULL;

#ifdef HAVE_CYRUS_SASL
      sasl_conn_t *ctx = conn->c_sasl_authctx;

      if( ctx == NULL ) ctx = conn->c_sasl_sockctx;

      if( ctx != NULL ) {
            int sc;
            SASL_CONST char *mechstr;

            sc = sasl_listmech( ctx,
                  NULL, NULL, ",", NULL,
                  &mechstr, NULL, NULL );

            if( sc != SASL_OK ) {
                  Debug( LDAP_DEBUG_ANY, "slap_sasl_listmech failed: %d\n",
                        sc, 0, 0 );

                  return NULL;
            }

            mechs = ldap_str2charray( mechstr, "," );
      }
#elif defined(SLAP_BUILTIN_SASL)
      /* builtin SASL implementation */
      SASL_CTX *ctx = conn->c_sasl_authctx;
      if ( ctx != NULL && ctx->sc_external_id.bv_val ) {
            /* should check ssf */
            mechs = ldap_str2charray( "EXTERNAL", "," );
      }
#endif

      return mechs;
}

int slap_sasl_close( Connection *conn )
{
#ifdef HAVE_CYRUS_SASL
      sasl_conn_t *ctx = conn->c_sasl_authctx;

      if( ctx != NULL ) {
            sasl_dispose( &ctx );
      }
      if ( conn->c_sasl_sockctx &&
            conn->c_sasl_authctx != conn->c_sasl_sockctx )
      {
            ctx = conn->c_sasl_sockctx;
            sasl_dispose( &ctx );
      }

      conn->c_sasl_authctx = NULL;
      conn->c_sasl_sockctx = NULL;
      conn->c_sasl_done = 0;

      free( conn->c_sasl_extra );
      conn->c_sasl_extra = NULL;

#elif defined(SLAP_BUILTIN_SASL)
      SASL_CTX *ctx = conn->c_sasl_authctx;
      if( ctx ) {
            if( ctx->sc_external_id.bv_val ) {
                  free( ctx->sc_external_id.bv_val );
                  BER_BVZERO( &ctx->sc_external_id );
            }
            free( ctx );
            conn->c_sasl_authctx = NULL;
      }
#endif

      return LDAP_SUCCESS;
}

int slap_sasl_bind( Operation *op, SlapReply *rs )
{
#ifdef HAVE_CYRUS_SASL
      sasl_conn_t *ctx = op->o_conn->c_sasl_authctx;
      struct berval response;
      unsigned reslen = 0;
      int sc;

      Debug(LDAP_DEBUG_ARGS,
            "==> sasl_bind: dn=\"%s\" mech=%s datalen=%ld\n",
            op->o_req_dn.bv_len ? op->o_req_dn.bv_val : "",
            op->o_conn->c_sasl_bind_in_progress ? "<continuing>" : 
            op->o_conn->c_sasl_bind_mech.bv_val,
            op->orb_cred.bv_len );

      if( ctx == NULL ) {
            send_ldap_error( op, rs, LDAP_UNAVAILABLE,
                  "SASL unavailable on this session" );
            return rs->sr_err;
      }

#define     START( ctx, mech, cred, clen, resp, rlen, err ) \
      sasl_server_start( ctx, mech, cred, clen, resp, rlen )
#define     STEP( ctx, cred, clen, resp, rlen, err ) \
      sasl_server_step( ctx, cred, clen, resp, rlen )

      if ( !op->o_conn->c_sasl_bind_in_progress ) {
            /* If we already authenticated once, must use a new context */
            if ( op->o_conn->c_sasl_done ) {
                  sasl_ssf_t ssf = 0;
                  const char *authid = NULL;
                  sasl_getprop( ctx, SASL_SSF_EXTERNAL, (void *)&ssf );
                  sasl_getprop( ctx, SASL_AUTH_EXTERNAL, (void *)&authid );
                  if ( authid ) authid = ch_strdup( authid );
                  if ( ctx != op->o_conn->c_sasl_sockctx ) {
                        sasl_dispose( &ctx );
                  }
                  op->o_conn->c_sasl_authctx = NULL;
                        
                  slap_sasl_open( op->o_conn, 1 );
                  ctx = op->o_conn->c_sasl_authctx;
                  if ( authid ) {
                        sasl_setprop( ctx, SASL_SSF_EXTERNAL, &ssf );
                        sasl_setprop( ctx, SASL_AUTH_EXTERNAL, authid );
                        ch_free( (char *)authid );
                  }
            }
            sc = START( ctx,
                  op->o_conn->c_sasl_bind_mech.bv_val,
                  op->orb_cred.bv_val, op->orb_cred.bv_len,
                  (SASL_CONST char **)&response.bv_val, &reslen, &rs->sr_text );

      } else {
            sc = STEP( ctx,
                  op->orb_cred.bv_val, op->orb_cred.bv_len,
                  (SASL_CONST char **)&response.bv_val, &reslen, &rs->sr_text );
      }

      response.bv_len = reslen;

      if ( sc == SASL_OK ) {
            sasl_ssf_t *ssf = NULL;

            ber_dupbv_x( &op->orb_edn, &op->o_conn->c_sasl_dn, op->o_tmpmemctx );
            BER_BVZERO( &op->o_conn->c_sasl_dn );
            op->o_conn->c_sasl_done = 1;

            rs->sr_err = LDAP_SUCCESS;

            (void) sasl_getprop( ctx, SASL_SSF, (void *)&ssf );
            op->orb_ssf = ssf ? *ssf : 0;

            ctx = NULL;
            if( op->orb_ssf ) {
                  ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
                  op->o_conn->c_sasl_layers++;

                  /* If there's an old layer, set sockctx to NULL to
                   * tell connection_read() to wait for us to finish.
                   * Otherwise there is a race condition: we have to
                   * send the Bind response using the old security
                   * context and then remove it before reading any
                   * new messages.
                   */
                  if ( op->o_conn->c_sasl_sockctx ) {
                        ctx = op->o_conn->c_sasl_sockctx;
                        op->o_conn->c_sasl_sockctx = NULL;
                  } else {
                        op->o_conn->c_sasl_sockctx = op->o_conn->c_sasl_authctx;
                  }
                  ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
            }

            /* Must send response using old security layer */
            if (response.bv_len) rs->sr_sasldata = &response;
            send_ldap_sasl( op, rs );
            
            /* Now dispose of the old security layer.
             */
            if ( ctx ) {
                  ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
                  ldap_pvt_sasl_remove( op->o_conn->c_sb );
                  op->o_conn->c_sasl_sockctx = op->o_conn->c_sasl_authctx;
                  ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
                  sasl_dispose( &ctx );
            }
      } else if ( sc == SASL_CONTINUE ) {
            rs->sr_err = LDAP_SASL_BIND_IN_PROGRESS,
            rs->sr_text = sasl_errdetail( ctx );
            rs->sr_sasldata = &response;
            send_ldap_sasl( op, rs );

      } else {
            BER_BVZERO( &op->o_conn->c_sasl_dn );
            rs->sr_text = sasl_errdetail( ctx );
            rs->sr_err = slap_sasl_err2ldap( sc ),
            send_ldap_result( op, rs );
      }

      Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: rc=%d\n", rs->sr_err, 0, 0);

#elif defined(SLAP_BUILTIN_SASL)
      /* built-in SASL implementation */
      SASL_CTX *ctx = op->o_conn->c_sasl_authctx;

      if ( ctx == NULL ) {
            send_ldap_error( op, rs, LDAP_OTHER,
                  "Internal SASL Error" );

      } else if ( bvmatch( &ext_bv, &op->o_conn->c_sasl_bind_mech ) ) {
            /* EXTERNAL */

            if( op->orb_cred.bv_len ) {
                  rs->sr_text = "proxy authorization not support";
                  rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
                  send_ldap_result( op, rs );

            } else {
                  op->orb_edn = ctx->sc_external_id;
                  rs->sr_err = LDAP_SUCCESS;
                  rs->sr_sasldata = NULL;
                  send_ldap_sasl( op, rs );
            }

      } else {
            send_ldap_error( op, rs, LDAP_AUTH_METHOD_NOT_SUPPORTED,
                  "requested SASL mechanism not supported" );
      }
#else
      send_ldap_error( op, rs, LDAP_AUTH_METHOD_NOT_SUPPORTED,
            "SASL not supported" );
#endif

      return rs->sr_err;
}

char* slap_sasl_secprops( const char *in )
{
#ifdef HAVE_CYRUS_SASL
      int rc = ldap_pvt_sasl_secprops( in, &sasl_secprops );

      return rc == LDAP_SUCCESS ? NULL : "Invalid security properties";
#else
      return "SASL not supported";
#endif
}

void slap_sasl_secprops_unparse( struct berval *bv )
{
#ifdef HAVE_CYRUS_SASL
      ldap_pvt_sasl_secprops_unparse( &sasl_secprops, bv );
#endif
}

#ifdef HAVE_CYRUS_SASL
int
slap_sasl_setpass( Operation *op, SlapReply *rs )
{
      struct berval id = BER_BVNULL;      /* needs to come from connection */
      struct berval new = BER_BVNULL;
      struct berval old = BER_BVNULL;

      assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );

      rs->sr_err = sasl_getprop( op->o_conn->c_sasl_authctx, SASL_USERNAME,
            (SASL_CONST void **)(char *)&id.bv_val );

      if( rs->sr_err != SASL_OK ) {
            rs->sr_text = "unable to retrieve SASL username";
            rs->sr_err = LDAP_OTHER;
            goto done;
      }

      Debug( LDAP_DEBUG_ARGS, "==> slap_sasl_setpass: \"%s\"\n",
            id.bv_val ? id.bv_val : "", 0, 0 );

      rs->sr_err = slap_passwd_parse( op->ore_reqdata,
            NULL, &old, &new, &rs->sr_text );

      if( rs->sr_err != LDAP_SUCCESS ) {
            goto done;
      }

      if( new.bv_len == 0 ) {
            slap_passwd_generate(&new);

            if( new.bv_len == 0 ) {
                  rs->sr_text = "password generation failed.";
                  rs->sr_err = LDAP_OTHER;
                  goto done;
            }
            
            rs->sr_rspdata = slap_passwd_return( &new );
      }

      rs->sr_err = sasl_setpass( op->o_conn->c_sasl_authctx, id.bv_val,
            new.bv_val, new.bv_len, old.bv_val, old.bv_len, 0 );
      if( rs->sr_err != SASL_OK ) {
            rs->sr_text = sasl_errdetail( op->o_conn->c_sasl_authctx );
      }
      switch(rs->sr_err) {
            case SASL_OK:
                  rs->sr_err = LDAP_SUCCESS;
                  break;

            case SASL_NOCHANGE:
            case SASL_NOMECH:
            case SASL_DISABLED:
            case SASL_PWLOCK:
            case SASL_FAIL:
            case SASL_BADPARAM:
            default:
                  rs->sr_err = LDAP_OTHER;
      }

done:
      return rs->sr_err;
}
#endif /* HAVE_CYRUS_SASL */

/* Take any sort of identity string and return a DN with the "dn:" prefix. The
 * string returned in *dn is in its own allocated memory, and must be free'd 
 * by the calling process.  -Mark Adamson, Carnegie Mellon
 *
 * The "dn:" prefix is no longer used anywhere inside slapd. It is only used
 * on strings passed in directly from SASL.  -Howard Chu, Symas Corp.
 */

#define SET_NONE  0
#define     SET_DN            1
#define     SET_U       2

int slap_sasl_getdn( Connection *conn, Operation *op, struct berval *id,
      char *user_realm, struct berval *dn, int flags )
{
      int rc, is_dn = SET_NONE, do_norm = 1;
      struct berval dn2, *mech;

      assert( conn != NULL );
      assert( id != NULL );

      Debug( LDAP_DEBUG_ARGS, "slap_sasl_getdn: conn %lu id=%s [len=%lu]\n", 
            conn->c_connid,
            BER_BVISNULL( id ) ? "NULL" : ( BER_BVISEMPTY( id ) ? "<empty>" : id->bv_val ),
            BER_BVISNULL( id ) ? 0 : ( BER_BVISEMPTY( id ) ? 0 :
                                       (unsigned long) id->bv_len ) );

      if ( !op ) {
            op = conn->c_sasl_bindop;
      }
      assert( op != NULL );

      BER_BVZERO( dn );

      if ( !BER_BVISNULL( id ) ) {
            /* Blatantly anonymous ID */
            static struct berval bv_anonymous = BER_BVC( "anonymous" );

            if ( ber_bvstrcasecmp( id, &bv_anonymous ) == 0 ) {
                  return( LDAP_SUCCESS );
            }

      } else {
            /* FIXME: if empty, should we stop? */
            BER_BVSTR( id, "" );
      }

      if ( !BER_BVISEMPTY( &conn->c_sasl_bind_mech ) ) {
            mech = &conn->c_sasl_bind_mech;
      } else {
            mech = &conn->c_authmech;
      }

      /* An authcID needs to be converted to authzID form. Set the
       * values directly into *dn; they will be normalized later. (and
       * normalizing always makes a new copy.) An ID from a TLS certificate
       * is already normalized, so copy it and skip normalization.
       */
      if( flags & SLAP_GETDN_AUTHCID ) {
            if( bvmatch( mech, &ext_bv )) {
                  /* EXTERNAL DNs are already normalized */
                  assert( !BER_BVISNULL( id ) );

                  do_norm = 0;
                  is_dn = SET_DN;
                  ber_dupbv_x( dn, id, op->o_tmpmemctx );

            } else {
                  /* convert to u:<username> form */
                  is_dn = SET_U;
                  *dn = *id;
            }
      }

      if( is_dn == SET_NONE ) {
            if( !strncasecmp( id->bv_val, "u:", STRLENOF( "u:" ) ) ) {
                  is_dn = SET_U;
                  dn->bv_val = id->bv_val + STRLENOF( "u:" );
                  dn->bv_len = id->bv_len - STRLENOF( "u:" );

            } else if ( !strncasecmp( id->bv_val, "dn:", STRLENOF( "dn:" ) ) ) {
                  is_dn = SET_DN;
                  dn->bv_val = id->bv_val + STRLENOF( "dn:" );
                  dn->bv_len = id->bv_len - STRLENOF( "dn:" );
            }
      }

      /* No other possibilities from here */
      if( is_dn == SET_NONE ) {
            BER_BVZERO( dn );
            return( LDAP_INAPPROPRIATE_AUTH );
      }

      /* Username strings */
      if( is_dn == SET_U ) {
            /* ITS#3419: values may need escape */
            LDAPRDN           DN[ 5 ];
            LDAPAVA     *RDNs[ 4 ][ 2 ];
            LDAPAVA     AVAs[ 4 ];
            int         irdn;

            irdn = 0;
            DN[ irdn ] = RDNs[ irdn ];
            RDNs[ irdn ][ 0 ] = &AVAs[ irdn ];
            AVAs[ irdn ].la_attr = slap_schema.si_ad_uid->ad_cname;
            AVAs[ irdn ].la_value = *dn;
            AVAs[ irdn ].la_flags = LDAP_AVA_NULL;
            AVAs[ irdn ].la_private = NULL;
            RDNs[ irdn ][ 1 ] = NULL;

            if ( user_realm && *user_realm ) {
                  irdn++;
                  DN[ irdn ] = RDNs[ irdn ];
                  RDNs[ irdn ][ 0 ] = &AVAs[ irdn ];
                  AVAs[ irdn ].la_attr = slap_schema.si_ad_cn->ad_cname;
                  ber_str2bv( user_realm, 0, 0, &AVAs[ irdn ].la_value );
                  AVAs[ irdn ].la_flags = LDAP_AVA_NULL;
                  AVAs[ irdn ].la_private = NULL;
                  RDNs[ irdn ][ 1 ] = NULL;
            }

            if ( !BER_BVISNULL( mech ) ) {
                  irdn++;
                  DN[ irdn ] = RDNs[ irdn ];
                  RDNs[ irdn ][ 0 ] = &AVAs[ irdn ];
                  AVAs[ irdn ].la_attr = slap_schema.si_ad_cn->ad_cname;
                  AVAs[ irdn ].la_value = *mech;
                  AVAs[ irdn ].la_flags = LDAP_AVA_NULL;
                  AVAs[ irdn ].la_private = NULL;
                  RDNs[ irdn ][ 1 ] = NULL;
            }

            irdn++;
            DN[ irdn ] = RDNs[ irdn ];
            RDNs[ irdn ][ 0 ] = &AVAs[ irdn ];
            AVAs[ irdn ].la_attr = slap_schema.si_ad_cn->ad_cname;
            BER_BVSTR( &AVAs[ irdn ].la_value, "auth" );
            AVAs[ irdn ].la_flags = LDAP_AVA_NULL;
            AVAs[ irdn ].la_private = NULL;
            RDNs[ irdn ][ 1 ] = NULL;

            irdn++;
            DN[ irdn ] = NULL;

            rc = ldap_dn2bv_x( DN, dn, LDAP_DN_FORMAT_LDAPV3,
                        op->o_tmpmemctx );
            if ( rc != LDAP_SUCCESS ) {
                  BER_BVZERO( dn );
                  return rc;
            }

            Debug( LDAP_DEBUG_TRACE,
                  "slap_sasl_getdn: u:id converted to %s\n",
                  dn->bv_val, 0, 0 );

      } else {
            
            /* Dup the DN in any case, so we don't risk 
             * leaks or dangling pointers later,
             * and the DN value is '\0' terminated */
            ber_dupbv_x( &dn2, dn, op->o_tmpmemctx );
            dn->bv_val = dn2.bv_val;
      }

      /* All strings are in DN form now. Normalize if needed. */
      if ( do_norm ) {
            rc = dnNormalize( 0, NULL, NULL, dn, &dn2, op->o_tmpmemctx );

            /* User DNs were constructed above and must be freed now */
            slap_sl_free( dn->bv_val, op->o_tmpmemctx );

            if ( rc != LDAP_SUCCESS ) {
                  BER_BVZERO( dn );
                  return rc;
            }
            *dn = dn2;
      }

      /* Run thru regexp */
      slap_sasl2dn( op, dn, &dn2, flags );
      if( !BER_BVISNULL( &dn2 ) ) {
            slap_sl_free( dn->bv_val, op->o_tmpmemctx );
            *dn = dn2;
            Debug( LDAP_DEBUG_TRACE,
                  "slap_sasl_getdn: dn:id converted to %s\n",
                  dn->bv_val, 0, 0 );
      }

      return( LDAP_SUCCESS );
}

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