schema_init.c 69.4 KB
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/* schema_init.c - init builtin schema */
/* $OpenLDAP$ */
/*
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 * Copyright 1998-2003 The OpenLDAP Foundation, All Rights Reserved.
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 * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
 */

#include "portable.h"

#include <stdio.h>
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#include <limits.h>
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#include <ac/ctype.h>
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#include <ac/errno.h>
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#include <ac/string.h>
#include <ac/socket.h>

#include "slap.h"
#include "ldap_pvt.h"
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#include "lber_pvt.h"
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#include "ldap_utf8.h"

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#include "lutil_hash.h"
#define HASH_BYTES				LUTIL_HASH_BYTES
#define HASH_CONTEXT			lutil_HASH_CTX
#define HASH_Init(c)			lutil_HASHInit(c)
#define HASH_Update(c,buf,len)	lutil_HASHUpdate(c,buf,len)
#define HASH_Final(d,c)			lutil_HASHFinal(d,c)
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#define	OpenLDAPaciMatch			NULL

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/* approx matching rules */
#define directoryStringApproxMatchOID	"1.3.6.1.4.1.4203.666.4.4"
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#define directoryStringApproxMatch		approxMatch
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#define directoryStringApproxIndexer	approxIndexer
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#define directoryStringApproxFilter		approxFilter
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#define IA5StringApproxMatchOID			"1.3.6.1.4.1.4203.666.4.5"
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#define IA5StringApproxMatch			approxMatch
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#define IA5StringApproxIndexer			approxIndexer
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#define IA5StringApproxFilter			approxFilter
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static int
inValidate(
	Syntax *syntax,
	struct berval *in )
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{
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	/* no value allowed */
	return LDAP_INVALID_SYNTAX;
}
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static int
blobValidate(
	Syntax *syntax,
	struct berval *in )
{
	/* any value allowed */
	return LDAP_SUCCESS;
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}
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#define berValidate blobValidate

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static int
octetStringMatch(
	int *matchp,
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	slap_mask_t flags,
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	Syntax *syntax,
	MatchingRule *mr,
	struct berval *value,
	void *assertedValue )
{
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	struct berval *asserted = (struct berval *) assertedValue;
	int match = value->bv_len - asserted->bv_len;
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	if( match == 0 ) {
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		match = memcmp( value->bv_val, asserted->bv_val, value->bv_len );
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	}

	*matchp = match;
	return LDAP_SUCCESS;
}

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static int
octetStringOrderingMatch(
	int *matchp,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *value,
	void *assertedValue )
{
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	struct berval *asserted = (struct berval *) assertedValue;
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	ber_len_t v_len  = value->bv_len;
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	ber_len_t av_len = asserted->bv_len;
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	int match = memcmp( value->bv_val, asserted->bv_val,
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		(v_len < av_len ? v_len : av_len) );
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	if( match == 0 ) match = v_len - av_len;

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	*matchp = match;
	return LDAP_SUCCESS;
}

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/* Index generation function */
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int octetStringIndexer(
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	slap_mask_t use,
	slap_mask_t flags,
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	Syntax *syntax,
	MatchingRule *mr,
	struct berval *prefix,
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	BerVarray values,
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	BerVarray *keysp,
	void *ctx )
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{
	int i;
	size_t slen, mlen;
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	BerVarray keys;
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	HASH_CONTEXT HASHcontext;
	unsigned char HASHdigest[HASH_BYTES];
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	struct berval digest;
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	digest.bv_val = HASHdigest;
	digest.bv_len = sizeof(HASHdigest);
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	for( i=0; values[i].bv_val != NULL; i++ ) {
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		/* just count them */
	}

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	/* we should have at least one value at this point */
	assert( i > 0 );

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	keys = sl_malloc( sizeof( struct berval ) * (i+1), ctx );
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	slen = syntax->ssyn_oidlen;
	mlen = mr->smr_oidlen;
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	for( i=0; values[i].bv_val != NULL; i++ ) {
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		HASH_Init( &HASHcontext );
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		if( prefix != NULL && prefix->bv_len > 0 ) {
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			HASH_Update( &HASHcontext,
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				prefix->bv_val, prefix->bv_len );
		}
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		HASH_Update( &HASHcontext,
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			syntax->ssyn_oid, slen );
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		HASH_Update( &HASHcontext,
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			mr->smr_oid, mlen );
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		HASH_Update( &HASHcontext,
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			values[i].bv_val, values[i].bv_len );
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		HASH_Final( HASHdigest, &HASHcontext );
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		ber_dupbv_x( &keys[i], &digest, ctx );
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	}

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	keys[i].bv_val = NULL;
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	keys[i].bv_len = 0;
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	*keysp = keys;

	return LDAP_SUCCESS;
}

/* Index generation function */
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int octetStringFilter(
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	slap_mask_t use,
	slap_mask_t flags,
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	Syntax *syntax,
	MatchingRule *mr,
	struct berval *prefix,
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	void * assertedValue,
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	BerVarray *keysp,
	void *ctx )
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{
	size_t slen, mlen;
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	BerVarray keys;
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	HASH_CONTEXT HASHcontext;
	unsigned char HASHdigest[HASH_BYTES];
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	struct berval *value = (struct berval *) assertedValue;
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	struct berval digest;
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	digest.bv_val = HASHdigest;
	digest.bv_len = sizeof(HASHdigest);
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	slen = syntax->ssyn_oidlen;
	mlen = mr->smr_oidlen;
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	keys = sl_malloc( sizeof( struct berval ) * 2, ctx );
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	HASH_Init( &HASHcontext );
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	if( prefix != NULL && prefix->bv_len > 0 ) {
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		HASH_Update( &HASHcontext,
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			prefix->bv_val, prefix->bv_len );
	}
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	HASH_Update( &HASHcontext,
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		syntax->ssyn_oid, slen );
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	HASH_Update( &HASHcontext,
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		mr->smr_oid, mlen );
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	HASH_Update( &HASHcontext,
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		value->bv_val, value->bv_len );
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	HASH_Final( HASHdigest, &HASHcontext );
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	ber_dupbv_x( keys, &digest, ctx );
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	keys[1].bv_val = NULL;
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	keys[1].bv_len = 0;
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	*keysp = keys;

	return LDAP_SUCCESS;
}
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static int
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octetStringSubstringsMatch(
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	int *matchp,
	slap_mask_t flags,
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	Syntax *syntax,
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	MatchingRule *mr,
	struct berval *value,
	void *assertedValue )
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{
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	int match = 0;
	SubstringsAssertion *sub = assertedValue;
	struct berval left = *value;
	int i;
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	ber_len_t inlen = 0;
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	/* Add up asserted input length */
	if( sub->sa_initial.bv_val ) {
		inlen += sub->sa_initial.bv_len;
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	}
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	if( sub->sa_any ) {
		for(i=0; sub->sa_any[i].bv_val != NULL; i++) {
			inlen += sub->sa_any[i].bv_len;
		}
	}
	if( sub->sa_final.bv_val ) {
		inlen += sub->sa_final.bv_len;
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	}

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	if( sub->sa_initial.bv_val ) {
		if( inlen > left.bv_len ) {
			match = 1;
			goto done;
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		}

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		match = memcmp( sub->sa_initial.bv_val, left.bv_val,
			sub->sa_initial.bv_len );
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		if( match != 0 ) {
			goto done;
		}
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		left.bv_val += sub->sa_initial.bv_len;
		left.bv_len -= sub->sa_initial.bv_len;
		inlen -= sub->sa_initial.bv_len;
	}
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	if( sub->sa_final.bv_val ) {
		if( inlen > left.bv_len ) {
			match = 1;
			goto done;
		}
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		match = memcmp( sub->sa_final.bv_val,
			&left.bv_val[left.bv_len - sub->sa_final.bv_len],
			sub->sa_final.bv_len );
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		if( match != 0 ) {
			goto done;
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		}

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		left.bv_len -= sub->sa_final.bv_len;
		inlen -= sub->sa_final.bv_len;
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	}

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	if( sub->sa_any ) {
		for(i=0; sub->sa_any[i].bv_val; i++) {
			ber_len_t idx;
			char *p;
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retry:
			if( inlen > left.bv_len ) {
				/* not enough length */
				match = 1;
				goto done;
			}
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			if( sub->sa_any[i].bv_len == 0 ) {
				continue;
			}
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			p = memchr( left.bv_val, *sub->sa_any[i].bv_val, left.bv_len );
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			if( p == NULL ) {
				match = 1;
				goto done;
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			}

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			idx = p - left.bv_val;
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			if( idx >= left.bv_len ) {
				/* this shouldn't happen */
				return LDAP_OTHER;
			}
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			left.bv_val = p;
			left.bv_len -= idx;
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			if( sub->sa_any[i].bv_len > left.bv_len ) {
				/* not enough left */
				match = 1;
				goto done;
			}
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			match = memcmp( left.bv_val,
				sub->sa_any[i].bv_val,
				sub->sa_any[i].bv_len );
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			if( match != 0 ) {
				left.bv_val++;
				left.bv_len--;
				goto retry;
			}
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			left.bv_val += sub->sa_any[i].bv_len;
			left.bv_len -= sub->sa_any[i].bv_len;
			inlen -= sub->sa_any[i].bv_len;
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		}
	}

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done:
	*matchp = match;
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	return LDAP_SUCCESS;
}

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/* Substrings Index generation function */
static int
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octetStringSubstringsIndexer(
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	slap_mask_t use,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *prefix,
	BerVarray values,
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	BerVarray *keysp,
	void *ctx )
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{
	ber_len_t i, j, nkeys;
	size_t slen, mlen;
	BerVarray keys;

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	HASH_CONTEXT HASHcontext;
	unsigned char HASHdigest[HASH_BYTES];
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	struct berval digest;
	digest.bv_val = HASHdigest;
	digest.bv_len = sizeof(HASHdigest);

	nkeys=0;

	for( i=0; values[i].bv_val != NULL; i++ ) {
		/* count number of indices to generate */
		if( values[i].bv_len < SLAP_INDEX_SUBSTR_MINLEN ) {
			continue;
		}

		if( flags & SLAP_INDEX_SUBSTR_INITIAL ) {
			if( values[i].bv_len >= SLAP_INDEX_SUBSTR_MAXLEN ) {
				nkeys += SLAP_INDEX_SUBSTR_MAXLEN -
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					(SLAP_INDEX_SUBSTR_MINLEN - 1);
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			} else {
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				nkeys += values[i].bv_len - (SLAP_INDEX_SUBSTR_MINLEN - 1);
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			}
		}

		if( flags & SLAP_INDEX_SUBSTR_ANY ) {
			if( values[i].bv_len >= SLAP_INDEX_SUBSTR_MAXLEN ) {
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				nkeys += values[i].bv_len - (SLAP_INDEX_SUBSTR_MAXLEN - 1);
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			}
		}

		if( flags & SLAP_INDEX_SUBSTR_FINAL ) {
			if( values[i].bv_len >= SLAP_INDEX_SUBSTR_MAXLEN ) {
				nkeys += SLAP_INDEX_SUBSTR_MAXLEN -
					( SLAP_INDEX_SUBSTR_MINLEN - 1);
			} else {
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				nkeys += values[i].bv_len - (SLAP_INDEX_SUBSTR_MINLEN - 1);
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			}
		}
	}

	if( nkeys == 0 ) {
		/* no keys to generate */
		*keysp = NULL;
		return LDAP_SUCCESS;
	}

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	keys = sl_malloc( sizeof( struct berval ) * (nkeys+1), ctx );
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	slen = syntax->ssyn_oidlen;
	mlen = mr->smr_oidlen;

	nkeys=0;
	for( i=0; values[i].bv_val != NULL; i++ ) {
		ber_len_t j,max;

		if( values[i].bv_len < SLAP_INDEX_SUBSTR_MINLEN ) continue;

		if( ( flags & SLAP_INDEX_SUBSTR_ANY ) &&
			( values[i].bv_len >= SLAP_INDEX_SUBSTR_MAXLEN ) )
		{
			char pre = SLAP_INDEX_SUBSTR_PREFIX;
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			max = values[i].bv_len - (SLAP_INDEX_SUBSTR_MAXLEN - 1);
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			for( j=0; j<max; j++ ) {
				HASH_Init( &HASHcontext );
				if( prefix != NULL && prefix->bv_len > 0 ) {
					HASH_Update( &HASHcontext,
						prefix->bv_val, prefix->bv_len );
				}

				HASH_Update( &HASHcontext,
					&pre, sizeof( pre ) );
				HASH_Update( &HASHcontext,
					syntax->ssyn_oid, slen );
				HASH_Update( &HASHcontext,
					mr->smr_oid, mlen );
				HASH_Update( &HASHcontext,
					&values[i].bv_val[j],
					SLAP_INDEX_SUBSTR_MAXLEN );
				HASH_Final( HASHdigest, &HASHcontext );

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				ber_dupbv_x( &keys[nkeys++], &digest, ctx );
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			}
		}

		max = SLAP_INDEX_SUBSTR_MAXLEN < values[i].bv_len
			? SLAP_INDEX_SUBSTR_MAXLEN : values[i].bv_len;

		for( j=SLAP_INDEX_SUBSTR_MINLEN; j<=max; j++ ) {
			char pre;

			if( flags & SLAP_INDEX_SUBSTR_INITIAL ) {
				pre = SLAP_INDEX_SUBSTR_INITIAL_PREFIX;
				HASH_Init( &HASHcontext );
				if( prefix != NULL && prefix->bv_len > 0 ) {
					HASH_Update( &HASHcontext,
						prefix->bv_val, prefix->bv_len );
				}
				HASH_Update( &HASHcontext,
					&pre, sizeof( pre ) );
				HASH_Update( &HASHcontext,
					syntax->ssyn_oid, slen );
				HASH_Update( &HASHcontext,
					mr->smr_oid, mlen );
				HASH_Update( &HASHcontext,
					values[i].bv_val, j );
				HASH_Final( HASHdigest, &HASHcontext );

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				ber_dupbv_x( &keys[nkeys++], &digest, ctx );
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			}

			if( flags & SLAP_INDEX_SUBSTR_FINAL ) {
				pre = SLAP_INDEX_SUBSTR_FINAL_PREFIX;
				HASH_Init( &HASHcontext );
				if( prefix != NULL && prefix->bv_len > 0 ) {
					HASH_Update( &HASHcontext,
						prefix->bv_val, prefix->bv_len );
				}
				HASH_Update( &HASHcontext,
					&pre, sizeof( pre ) );
				HASH_Update( &HASHcontext,
					syntax->ssyn_oid, slen );
				HASH_Update( &HASHcontext,
					mr->smr_oid, mlen );
				HASH_Update( &HASHcontext,
					&values[i].bv_val[values[i].bv_len-j], j );
				HASH_Final( HASHdigest, &HASHcontext );

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				ber_dupbv_x( &keys[nkeys++], &digest, ctx );
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			}

		}

	}

	if( nkeys > 0 ) {
		keys[nkeys].bv_val = NULL;
		*keysp = keys;
	} else {
		ch_free( keys );
		*keysp = NULL;
	}

	return LDAP_SUCCESS;
}

static int
octetStringSubstringsFilter (
	slap_mask_t use,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *prefix,
	void * assertedValue,
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	BerVarray *keysp,
	void *ctx)
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{
	SubstringsAssertion *sa;
	char pre;
	ber_len_t nkeys = 0;
	size_t slen, mlen, klen;
	BerVarray keys;
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	HASH_CONTEXT HASHcontext;
	unsigned char HASHdigest[HASH_BYTES];
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	struct berval *value;
	struct berval digest;

	sa = (SubstringsAssertion *) assertedValue;

	if( flags & SLAP_INDEX_SUBSTR_INITIAL && sa->sa_initial.bv_val != NULL
		&& sa->sa_initial.bv_len >= SLAP_INDEX_SUBSTR_MINLEN )
	{
		nkeys++;
	}

	if( flags & SLAP_INDEX_SUBSTR_ANY && sa->sa_any != NULL ) {
		ber_len_t i;
		for( i=0; sa->sa_any[i].bv_val != NULL; i++ ) {
			if( sa->sa_any[i].bv_len >= SLAP_INDEX_SUBSTR_MAXLEN ) {
				/* don't bother accounting for stepping */
				nkeys += sa->sa_any[i].bv_len -
					( SLAP_INDEX_SUBSTR_MAXLEN - 1 );
			}
		}
	}

	if( flags & SLAP_INDEX_SUBSTR_FINAL && sa->sa_final.bv_val != NULL &&
		sa->sa_final.bv_len >= SLAP_INDEX_SUBSTR_MINLEN )
	{
		nkeys++;
	}

	if( nkeys == 0 ) {
		*keysp = NULL;
		return LDAP_SUCCESS;
	}

	digest.bv_val = HASHdigest;
	digest.bv_len = sizeof(HASHdigest);

	slen = syntax->ssyn_oidlen;
	mlen = mr->smr_oidlen;

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	keys = sl_malloc( sizeof( struct berval ) * (nkeys+1), ctx );
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	nkeys = 0;

	if( flags & SLAP_INDEX_SUBSTR_INITIAL && sa->sa_initial.bv_val != NULL &&
		sa->sa_initial.bv_len >= SLAP_INDEX_SUBSTR_MINLEN )
	{
		pre = SLAP_INDEX_SUBSTR_INITIAL_PREFIX;
		value = &sa->sa_initial;

		klen = SLAP_INDEX_SUBSTR_MAXLEN < value->bv_len
			? SLAP_INDEX_SUBSTR_MAXLEN : value->bv_len;

		HASH_Init( &HASHcontext );
		if( prefix != NULL && prefix->bv_len > 0 ) {
			HASH_Update( &HASHcontext,
				prefix->bv_val, prefix->bv_len );
		}
		HASH_Update( &HASHcontext,
			&pre, sizeof( pre ) );
		HASH_Update( &HASHcontext,
			syntax->ssyn_oid, slen );
		HASH_Update( &HASHcontext,
			mr->smr_oid, mlen );
		HASH_Update( &HASHcontext,
			value->bv_val, klen );
		HASH_Final( HASHdigest, &HASHcontext );

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		ber_dupbv_x( &keys[nkeys++], &digest, ctx );
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	}

	if( flags & SLAP_INDEX_SUBSTR_ANY && sa->sa_any != NULL ) {
		ber_len_t i, j;
		pre = SLAP_INDEX_SUBSTR_PREFIX;
		klen = SLAP_INDEX_SUBSTR_MAXLEN;

		for( i=0; sa->sa_any[i].bv_val != NULL; i++ ) {
			if( sa->sa_any[i].bv_len < SLAP_INDEX_SUBSTR_MAXLEN ) {
				continue;
			}

			value = &sa->sa_any[i];

			for(j=0;
				j <= value->bv_len - SLAP_INDEX_SUBSTR_MAXLEN;
				j += SLAP_INDEX_SUBSTR_STEP )
			{
				HASH_Init( &HASHcontext );
				if( prefix != NULL && prefix->bv_len > 0 ) {
					HASH_Update( &HASHcontext,
						prefix->bv_val, prefix->bv_len );
				}
				HASH_Update( &HASHcontext,
					&pre, sizeof( pre ) );
				HASH_Update( &HASHcontext,
					syntax->ssyn_oid, slen );
				HASH_Update( &HASHcontext,
					mr->smr_oid, mlen );
				HASH_Update( &HASHcontext,
					&value->bv_val[j], klen ); 
				HASH_Final( HASHdigest, &HASHcontext );

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				ber_dupbv_x( &keys[nkeys++], &digest, ctx );
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			}
		}
	}

	if( flags & SLAP_INDEX_SUBSTR_FINAL && sa->sa_final.bv_val != NULL &&
		sa->sa_final.bv_len >= SLAP_INDEX_SUBSTR_MINLEN )
	{
		pre = SLAP_INDEX_SUBSTR_FINAL_PREFIX;
		value = &sa->sa_final;

		klen = SLAP_INDEX_SUBSTR_MAXLEN < value->bv_len
			? SLAP_INDEX_SUBSTR_MAXLEN : value->bv_len;

		HASH_Init( &HASHcontext );
		if( prefix != NULL && prefix->bv_len > 0 ) {
			HASH_Update( &HASHcontext,
				prefix->bv_val, prefix->bv_len );
		}
		HASH_Update( &HASHcontext,
			&pre, sizeof( pre ) );
		HASH_Update( &HASHcontext,
			syntax->ssyn_oid, slen );
		HASH_Update( &HASHcontext,
			mr->smr_oid, mlen );
		HASH_Update( &HASHcontext,
			&value->bv_val[value->bv_len-klen], klen );
		HASH_Final( HASHdigest, &HASHcontext );

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		ber_dupbv_x( &keys[nkeys++], &digest, ctx );
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	}

	if( nkeys > 0 ) {
		keys[nkeys].bv_val = NULL;
		*keysp = keys;
	} else {
		ch_free( keys );
		*keysp = NULL;
	}

	return LDAP_SUCCESS;
}

static int
bitStringValidate(
	Syntax *syntax,
	struct berval *in )
{
	ber_len_t i;

	/* very unforgiving validation, requires no normalization
	 * before simplistic matching
	 */
	if( in->bv_len < 3 ) {
		return LDAP_INVALID_SYNTAX;
	}

	/*
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	 * RFC 2252 section 6.3 Bit String
	 *	bitstring = "'" *binary-digit "'B"
	 *	binary-digit = "0" / "1"
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	 * example: '0101111101'B
	 */
	
	if( in->bv_val[0] != '\'' ||
		in->bv_val[in->bv_len-2] != '\'' ||
		in->bv_val[in->bv_len-1] != 'B' )
	{
		return LDAP_INVALID_SYNTAX;
	}

	for( i=in->bv_len-3; i>0; i-- ) {
		if( in->bv_val[i] != '0' && in->bv_val[i] != '1' ) {
			return LDAP_INVALID_SYNTAX;
		}
	}

	return LDAP_SUCCESS;
}

static int
nameUIDValidate(
	Syntax *syntax,
	struct berval *in )
{
	int rc;
	struct berval dn;

	if( in->bv_len == 0 ) return LDAP_SUCCESS;

	ber_dupbv( &dn, in );
	if( !dn.bv_val ) return LDAP_OTHER;

	if( dn.bv_val[dn.bv_len-1] == 'B'
		&& dn.bv_val[dn.bv_len-2] == '\'' )
	{
		/* assume presence of optional UID */
		ber_len_t i;

		for(i=dn.bv_len-3; i>1; i--) {
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			if( dn.bv_val[i] != '0' && dn.bv_val[i] != '1' ) {
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				break;
			}
		}
		if( dn.bv_val[i] != '\'' || dn.bv_val[i-1] != '#' ) {
			ber_memfree( dn.bv_val );
			return LDAP_INVALID_SYNTAX;
		}

		/* trim the UID to allow use of dnValidate */
		dn.bv_val[i-1] = '\0';
		dn.bv_len = i-1;
	}

	rc = dnValidate( NULL, &dn );

	ber_memfree( dn.bv_val );
	return rc;
}

static int
uniqueMemberNormalize(
	slap_mask_t usage,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *val,
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	struct berval *normalized,
	void *ctx )
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{
	struct berval out;
	int rc;

	ber_dupbv( &out, val );
	if( out.bv_len != 0 ) {
		struct berval uid = { 0, NULL };

		if( out.bv_val[out.bv_len-1] == 'B'
			&& out.bv_val[out.bv_len-2] == '\'' )
		{
			/* assume presence of optional UID */
			uid.bv_val = strrchr( out.bv_val, '#' );

			if( uid.bv_val == NULL ) {
				free( out.bv_val );
				return LDAP_INVALID_SYNTAX;
			}

			uid.bv_len = out.bv_len - (uid.bv_val - out.bv_val);
			out.bv_len -= uid.bv_len--;

			/* temporarily trim the UID */
			*(uid.bv_val++) = '\0';
		}

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		rc = dnNormalize( 0, NULL, NULL, &out, normalized, ctx );
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		if( rc != LDAP_SUCCESS ) {
			free( out.bv_val );
			return LDAP_INVALID_SYNTAX;
		}

		if( uid.bv_len ) {
			normalized->bv_val = ch_realloc( normalized->bv_val,
				normalized->bv_len + uid.bv_len + sizeof("#") );

			/* insert the separator */
			normalized->bv_val[normalized->bv_len++] = '#';

			/* append the UID */
			AC_MEMCPY( &normalized->bv_val[normalized->bv_len],
				uid.bv_val, uid.bv_len );
			normalized->bv_len += uid.bv_len;

			/* terminate */
			normalized->bv_val[normalized->bv_len] = '\0';
		}

		free( out.bv_val );
	}

	return LDAP_SUCCESS;
}

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static int
uniqueMemberMatch(
	int *matchp,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *value,
	void *assertedValue )
{
	int match;
	struct berval *asserted = (struct berval *) assertedValue;
	struct berval assertedDN = { 0, NULL };
	struct berval assertedUID = { 0, NULL };
	struct berval valueDN = { 0, NULL };
	struct berval valueUID = { 0, NULL };

	if( asserted->bv_len != 0 ) {
		assertedDN = *asserted;

		if( assertedDN.bv_val[assertedDN.bv_len-1] == 'B'
			&& assertedDN.bv_val[assertedDN.bv_len-2] == '\'' )
		{
			/* assume presence of optional UID */
			assertedUID.bv_val = strrchr( assertedDN.bv_val, '#' );

			if( assertedUID.bv_val == NULL ) {
				return LDAP_INVALID_SYNTAX;
			}

			assertedUID.bv_len = assertedDN.bv_len -
				(assertedUID.bv_val - assertedDN.bv_val);
			assertedDN.bv_len -= assertedUID.bv_len--;

			/* trim the separator */
			assertedUID.bv_val++;
		}
	}

	if( value->bv_len != 0 ) {
		valueDN = *value;

		if( valueDN.bv_val[valueDN.bv_len-1] == 'B'
			&& valueDN.bv_val[valueDN.bv_len-2] == '\'' )
		{
			/* assume presence of optional UID */
			valueUID.bv_val = strrchr( valueDN.bv_val, '#' );

			if( valueUID.bv_val == NULL ) {
				return LDAP_INVALID_SYNTAX;
			}

			valueUID.bv_len = valueDN.bv_len -
				(assertedUID.bv_val - assertedDN.bv_val);
			valueDN.bv_len -= valueUID.bv_len--;

			/* trim the separator */
			valueUID.bv_val++;
		}
	}

	if( valueUID.bv_len && assertedUID.bv_len ) {
		match = memcmp( valueUID.bv_val, assertedUID.bv_val, valueUID.bv_len );
		if( match ) {
			*matchp = match;
			return LDAP_SUCCESS;
		}
	}

	return dnMatch( matchp, flags, syntax, mr, &valueDN, &assertedDN );
}

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/*
 * Handling boolean syntax and matching is quite rigid.
 * A more flexible approach would be to allow a variety
 * of strings to be normalized and prettied into TRUE
 * and FALSE.
 */
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static int
booleanValidate(
	Syntax *syntax,
	struct berval *in )
{
	/* very unforgiving validation, requires no normalization
	 * before simplistic matching
	 */

	if( in->bv_len == 4 ) {
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		if( bvmatch( in, &slap_true_bv ) ) {
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			return LDAP_SUCCESS;
		}
	} else if( in->bv_len == 5 ) {
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		if( bvmatch( in, &slap_false_bv ) ) {
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			return LDAP_SUCCESS;
		}
	}

	return LDAP_INVALID_SYNTAX;
}

static int
booleanMatch(
	int *matchp,
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	Syntax *syntax,
	MatchingRule *mr,
	struct berval *value,
	void *assertedValue )
{
	/* simplistic matching allowed by rigid validation */
	struct berval *asserted = (struct berval *) assertedValue;
	*matchp = value->bv_len != asserted->bv_len;
	return LDAP_SUCCESS;
}

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/*-------------------------------------------------------------------
LDAP/X.500 string syntax / matching rules have a few oddities.  This
comment attempts to detail how slapd(8) treats them.

Summary:
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  StringSyntax		X.500	LDAP	Matching/Comments
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  DirectoryString	CHOICE	UTF8	i/e + ignore insignificant spaces
  PrintableString	subset	subset	i/e + ignore insignificant spaces
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  PrintableString	subset	subset	i/e + ignore insignificant spaces
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  NumericString		subset	subset	ignore all spaces
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  IA5String			ASCII	ASCII	i/e + ignore insignificant spaces
  TeletexString		T.61	T.61	i/e + ignore insignificant spaces

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  TelephoneNumber	subset	subset	i + ignore all spaces and "-"
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  See draft-ietf-ldapbis-strpro for details (once published).


Directory String -
  In X.500(93), a directory string can be either a PrintableString,
  a bmpString, or a UniversalString (e.g., UCS (a subset of Unicode)).
  In later versions, more CHOICEs were added.  In all cases the string
  must be non-empty.

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  In LDAPv3, a directory string is a UTF-8 encoded UCS string.
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  A directory string cannot be zero length.
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  For matching, there are both case ignore and exact rules.  Both
  also require that "insignificant" spaces be ignored.
	spaces before the first non-space are ignored;
	spaces after the last non-space are ignored;
	spaces after a space are ignored.
  Note: by these rules (and as clarified in X.520), a string of only
  spaces is to be treated as if held one space, not empty (which
  would be a syntax error).

NumericString
  In ASN.1, numeric string is just a string of digits and spaces
  and could be empty.  However, in X.500, all attribute values of
  numeric string carry a non-empty constraint.  For example:

	internationalISDNNumber ATTRIBUTE ::= {
		WITH SYNTAX InternationalISDNNumber
		EQUALITY MATCHING RULE numericStringMatch
		SUBSTRINGS MATCHING RULE numericStringSubstringsMatch
		ID id-at-internationalISDNNumber }
	InternationalISDNNumber ::=
	    NumericString (SIZE(1..ub-international-isdn-number))

  Unforunately, some assertion values are don't carry the same
  constraint (but its unclear how such an assertion could ever
  be true). In LDAP, there is one syntax (numericString) not two
  (numericString with constraint, numericString without constraint).
  This should be treated as numericString with non-empty constraint.
  Note that while someone may have no ISDN number, there are no ISDN
  numbers which are zero length.

  In matching, spaces are ignored.

PrintableString
  In ASN.1, Printable string is just a string of printable characters
  and can be empty.  In X.500, semantics much like NumericString (see
  serialNumber for a like example) excepting uses insignificant space
  handling instead of ignore all spaces.  

IA5String
  Basically same as PrintableString.  There are no examples in X.500,
  but same logic applies.  So we require them to be non-empty as
  well.

-------------------------------------------------------------------*/

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static int
UTF8StringValidate(
	Syntax *syntax,
	struct berval *in )
{
	ber_len_t count;
	int len;
	unsigned char *u = in->bv_val;

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	if( in->bv_len == 0 && syntax == slap_schema.si_syn_directoryString ) {
		/* directory strings cannot be empty */
		return LDAP_INVALID_SYNTAX;
	}
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	for( count = in->bv_len; count > 0; count-=len, u+=len ) {
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		/* get the length indicated by the first byte */
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		len = LDAP_UTF8_CHARLEN2( u, len );
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		/* very basic checks */
		switch( len ) {
			case 6:
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					return LDAP_INVALID_SYNTAX;
				}
			case 5:
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				if( (u[4] & 0xC0) != 0x80 ) {
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					return LDAP_INVALID_SYNTAX;
				}
			case 4:
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					return LDAP_INVALID_SYNTAX;
				}
			case 3:
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				if( (u[2] & 0xC0 )!= 0x80 ) {
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					return LDAP_INVALID_SYNTAX;
				}
			case 2:
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				if( (u[1] & 0xC0) != 0x80 ) {
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					return LDAP_INVALID_SYNTAX;
				}
			case 1:
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				/* CHARLEN already validated it */
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				break;
			default:
				return LDAP_INVALID_SYNTAX;
		}
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		/* make sure len corresponds with the offset
			to the next character */
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	}

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	if( count != 0 ) {
		return LDAP_INVALID_SYNTAX;
	}
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	return LDAP_SUCCESS;
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}

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static int
UTF8StringNormalize(
	slap_mask_t use,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *val,
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	struct berval *normalized,
	void *ctx )
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{
	struct berval tmp, nvalue;
	int flags;
	int i, wasspace;

	if( val->bv_val == NULL ) {
		/* assume we're dealing with a syntax (e.g., UTF8String)
		 * which allows empty strings
		 */
		normalized->bv_len = 0;
		normalized->bv_val = NULL;
		return LDAP_SUCCESS;
	}

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	flags = SLAP_MR_ASSOCIATED( mr, slap_schema.si_mr_caseExactMatch )
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		? LDAP_UTF8_NOCASEFOLD : LDAP_UTF8_CASEFOLD;
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	flags |= ( ( use & SLAP_MR_EQUALITY_APPROX ) == SLAP_MR_EQUALITY_APPROX )
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		? LDAP_UTF8_APPROX : 0;

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	val = UTF8bvnormalize( val, &tmp, flags, ctx );
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	if( val == NULL ) {
		return LDAP_OTHER;
	}
	
	/* collapse spaces (in place) */
	nvalue.bv_len = 0;
	nvalue.bv_val = tmp.bv_val;

	wasspace=1; /* trim leading spaces */
	for( i=0; i<tmp.bv_len; i++) {
		if ( ASCII_SPACE( tmp.bv_val[i] )) {
			if( wasspace++ == 0 ) {
				/* trim repeated spaces */
				nvalue.bv_val[nvalue.bv_len++] = tmp.bv_val[i];
			}
		} else {
			wasspace = 0;
			nvalue.bv_val[nvalue.bv_len++] = tmp.bv_val[i];
		}
	}

	if( nvalue.bv_len ) {
		if( wasspace ) {
			/* last character was a space, trim it */
			--nvalue.bv_len;
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		}
		nvalue.bv_val[nvalue.bv_len] = '\0';
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	} else {
		/* string of all spaces is treated as one space */
		nvalue.bv_val[0] = ' ';
		nvalue.bv_val[1] = '\0';
		nvalue.bv_len = 1;
	}
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	*normalized = nvalue;
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	return LDAP_SUCCESS;
}

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#if defined(SLAPD_APPROX_INITIALS)
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#	define SLAPD_APPROX_DELIMITER "._ "
#	define SLAPD_APPROX_WORDLEN 2
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#else
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#	define SLAPD_APPROX_DELIMITER " "
#	define SLAPD_APPROX_WORDLEN 1
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#endif
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static int
approxMatch(
	int *matchp,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *value,
	void *assertedValue )
{
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	struct berval *nval, *assertv;
	char *val, **values, **words, *c;
	int i, count, len, nextchunk=0, nextavail=0;
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	/* Yes, this is necessary */
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	nval = UTF8bvnormalize( value, NULL, LDAP_UTF8_APPROX, NULL );
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	if( nval == NULL ) {
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		*matchp = 1;
		return LDAP_SUCCESS;
	}

	/* Yes, this is necessary */
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	assertv = UTF8bvnormalize( ((struct berval *)assertedValue),
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		NULL, LDAP_UTF8_APPROX, NULL );
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	if( assertv == NULL ) {
		ber_bvfree( nval );
		*matchp = 1;
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		return LDAP_SUCCESS;
	}

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	/* Isolate how many words there are */
	for ( c = nval->bv_val, count = 1; *c; c++ ) {
		c = strpbrk( c, SLAPD_APPROX_DELIMITER );
		if ( c == NULL ) break;
		*c = '\0';
		count++;
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	}

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	/* Get a phonetic copy of each word */
	words = (char **)ch_malloc( count * sizeof(char *) );
	values = (char **)ch_malloc( count * sizeof(char *) );
	for ( c = nval->bv_val, i = 0;  i < count; i++, c += strlen(c) + 1 ) {
		words[i] = c;
		values[i] = phonetic(c);
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	}
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	/* Work through the asserted value's words, to see if at least some
	   of the words are there, in the same order. */
	len = 0;
	while ( (ber_len_t) nextchunk < assertv->bv_len ) {
		len = strcspn( assertv->bv_val + nextchunk, SLAPD_APPROX_DELIMITER);
		if( len == 0 ) {
			nextchunk++;
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			continue;
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		}
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#if defined(SLAPD_APPROX_INITIALS)
		else if( len == 1 ) {
			/* Single letter words need to at least match one word's initial */
			for( i=nextavail; i<count; i++ )
				if( !strncasecmp( assertv->bv_val + nextchunk, words[i], 1 )) {
					nextavail=i+1;
					break;
				}
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		}
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#endif
		else {
			/* Isolate the next word in the asserted value and phonetic it */
			assertv->bv_val[nextchunk+len] = '\0';
			val = phonetic( assertv->bv_val + nextchunk );
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			/* See if this phonetic chunk is in the remaining words of *value */
			for( i=nextavail; i<count; i++ ){
				if( !strcmp( val, values[i] ) ){
					nextavail = i+1;
					break;
				}
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			}
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			ch_free( val );
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		}
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		/* This chunk in the asserted value was NOT within the *value. */
		if( i >= count ) {
			nextavail=-1;
			break;
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		}

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		/* Go on to the next word in the asserted value */
		nextchunk += len+1;
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	}
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	/* If some of the words were seen, call it a match */
	if( nextavail > 0 ) {
		*matchp = 0;
	}
	else {
		*matchp = 1;
	}
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	/* Cleanup allocs */
	ber_bvfree( assertv );
	for( i=0; i<count; i++ ) {
		ch_free( values[i] );
	}
	ch_free( values );
	ch_free( words );
	ber_bvfree( nval );
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	return LDAP_SUCCESS;
}
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static int 
approxIndexer(
	slap_mask_t use,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *prefix,
	BerVarray values,
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	BerVarray *keysp,
	void *ctx )
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{
	char *c;
	int i,j, len, wordcount, keycount=0;
	struct berval *newkeys;
	BerVarray keys=NULL;
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	for( j=0; values[j].bv_val != NULL; j++ ) {
		struct berval val = { 0, NULL };
		/* Yes, this is necessary */
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		UTF8bvnormalize( &values[j], &val, LDAP_UTF8_APPROX, NULL );
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		assert( val.bv_val != NULL );
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		/* Isolate how many words there are. There will be a key for each */
		for( wordcount = 0, c = val.bv_val; *c; c++) {
			len = strcspn(c, SLAPD_APPROX_DELIMITER);
			if( len >= SLAPD_APPROX_WORDLEN ) wordcount++;
			c+= len;
			if (*c == '\0') break;
			*c = '\0';
		}
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		/* Allocate/increase storage to account for new keys */
		newkeys = (struct berval *)ch_malloc( (keycount + wordcount + 1) 
			* sizeof(struct berval) );
		AC_MEMCPY( newkeys, keys, keycount * sizeof(struct berval) );
		if( keys ) ch_free( keys );
		keys = newkeys;
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		/* Get a phonetic copy of each word */
		for( c = val.bv_val, i = 0; i < wordcount; c += len + 1 ) {
			len = strlen( c );
			if( len < SLAPD_APPROX_WORDLEN ) continue;
			ber_str2bv( phonetic( c ), 0, 0, &keys[keycount] );
			keycount++;
			i++;
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		}
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		ber_memfree( val.bv_val );
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	}
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	keys[keycount].bv_val = NULL;
	*keysp = keys;
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	return LDAP_SUCCESS;
}
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static int 
approxFilter(
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	slap_mask_t use,
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	slap_mask_t flags,
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	Syntax *syntax,
	MatchingRule *mr,
	struct berval *prefix,
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	void * assertedValue,
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	BerVarray *keysp,
	void *ctx )
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{
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	char *c;
	int i, count, len;
	struct berval *val;
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	BerVarray keys;
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	/* Yes, this is necessary */
	val = UTF8bvnormalize( ((struct berval *)assertedValue),
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		NULL, LDAP_UTF8_APPROX, NULL );
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	if( val == NULL || val->bv_val == NULL ) {
		keys = (struct berval *)ch_malloc( sizeof(struct berval) );
		keys[0].bv_val = NULL;
		*keysp = keys;
		ber_bvfree( val );
		return LDAP_SUCCESS;
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	}
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	/* Isolate how many words there are. There will be a key for each */
	for( count = 0,c = val->bv_val; *c; c++) {
		len = strcspn(c, SLAPD_APPROX_DELIMITER);
		if( len >= SLAPD_APPROX_WORDLEN ) count++;
		c+= len;
		if (*c == '\0') break;
		*c = '\0';
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	}

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	/* Allocate storage for new keys */
	keys = (struct berval *)ch_malloc( (count + 1) * sizeof(struct berval) );
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	/* Get a phonetic copy of each word */
	for( c = val->bv_val, i = 0; i < count; c += len + 1 ) {
		len = strlen(c);
		if( len < SLAPD_APPROX_WORDLEN ) continue;
		ber_str2bv( phonetic( c ), 0, 0, &keys[i] );
		i++;
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	}