saslauthz.c 50.3 KB
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
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 * Copyright 1998-2020 The OpenLDAP Foundation.
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 * Portions Copyright 2000 Mark Adamson, Carnegie Mellon.
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 * 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>.
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 */
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#include "portable.h"

#include <stdio.h>
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#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
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#include <ac/stdlib.h>
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#include <ac/string.h>
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#include <ac/ctype.h>
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#include "slap.h"

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#include "lutil.h"
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#define SASLREGEX_REPLACE 10

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#define LDAP_X_SCOPE_EXACT	((ber_int_t) 0x0010)
#define LDAP_X_SCOPE_REGEX	((ber_int_t) 0x0020)
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#define LDAP_X_SCOPE_CHILDREN	((ber_int_t) 0x0030)
#define LDAP_X_SCOPE_SUBTREE	((ber_int_t) 0x0040)
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#define LDAP_X_SCOPE_ONELEVEL	((ber_int_t) 0x0050)
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#define LDAP_X_SCOPE_GROUP	((ber_int_t) 0x0060)
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#define LDAP_X_SCOPE_USERS	((ber_int_t) 0x0070)
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/*
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 * IDs in DNauthzid form can now have a type specifier, that
 * influences how they are used in related operations.
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 *
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 * syntax: dn[.{exact|regex}]:<val>
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 *
 * dn.exact:	the value must pass normalization and is used 
 *		in exact DN match.
 * dn.regex:	the value is treated as a regular expression 
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 *		in matching DN values in authz{To|From}
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 *		attributes.
 * dn:		for backwards compatibility reasons, the value 
 *		is treated as a regular expression, and thus 
 *		it is not normalized nor validated; it is used
 *		in exact or regex comparisons based on the 
 *		context.
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 *
 * IDs in DNauthzid form can now have a type specifier, that
 * influences how they are used in related operations.
 *
 * syntax: u[.mech[/realm]]:<val>
 * 
 * where mech is a SIMPLE, AUTHZ, or a SASL mechanism name
 * and realm is mechanism specific realm (separate to those
 * which are representable as part of the principal).
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 */

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typedef struct sasl_regexp {
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  char *sr_match;						/* regexp match pattern */
  char *sr_replace; 					/* regexp replace pattern */
  regex_t sr_workspace;					/* workspace for regexp engine */
  int sr_offset[SASLREGEX_REPLACE+2];	/* offsets of $1,$2... in *replace */
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} SaslRegexp_t;

static int nSaslRegexp = 0;
static SaslRegexp_t *SaslRegexp = NULL;

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#ifdef SLAP_AUTH_REWRITE
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#include "rewrite.h"
struct rewrite_info	*sasl_rwinfo = NULL;
#define AUTHID_CONTEXT	"authid"
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#endif /* SLAP_AUTH_REWRITE */
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/* What SASL proxy authorization policies are allowed? */
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#define	SASL_AUTHZ_NONE	0x00
#define	SASL_AUTHZ_FROM	0x01
#define	SASL_AUTHZ_TO	0x02
#define SASL_AUTHZ_AND	0x10
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static const char *policy_txt[] = {
	"none", "from", "to", "any"
};

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static int authz_policy = SASL_AUTHZ_NONE;

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static int
slap_sasl_match( Operation *opx, struct berval *rule,
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	struct berval *assertDN, struct berval *authc );

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int slap_sasl_setpolicy( const char *arg )
{
	int rc = LDAP_SUCCESS;

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	if ( strcasecmp( arg, "none" ) == 0 ) {
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		authz_policy = SASL_AUTHZ_NONE;
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	} else if ( strcasecmp( arg, "from" ) == 0 ) {
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		authz_policy = SASL_AUTHZ_FROM;
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	} else if ( strcasecmp( arg, "to" ) == 0 ) {
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		authz_policy = SASL_AUTHZ_TO;
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	} else if ( strcasecmp( arg, "both" ) == 0 || strcasecmp( arg, "any" ) == 0 ) {
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		authz_policy = SASL_AUTHZ_FROM | SASL_AUTHZ_TO;
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	} else if ( strcasecmp( arg, "all" ) == 0 ) {
		authz_policy = SASL_AUTHZ_FROM | SASL_AUTHZ_TO | SASL_AUTHZ_AND;
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	} else {
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		rc = LDAP_OTHER;
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	}
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	return rc;
}

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const char * slap_sasl_getpolicy()
{
	if ( authz_policy == (SASL_AUTHZ_FROM | SASL_AUTHZ_TO | SASL_AUTHZ_AND) )
		return "all";
	else
		return policy_txt[authz_policy];
}

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int slap_parse_user( struct berval *id, struct berval *user,
		struct berval *realm, struct berval *mech )
{
	char	u;
	
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	assert( id != NULL );
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	assert( !BER_BVISNULL( id ) );
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	assert( user != NULL );
	assert( realm != NULL );
	assert( mech != NULL );
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	u = id->bv_val[ 0 ];
	
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	if ( u != 'u' && u != 'U' ) {
		/* called with something other than u: */
		return LDAP_PROTOCOL_ERROR;
	}
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	/* uauthzid form:
	 *		u[.mech[/realm]]:user
	 */
	
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	user->bv_val = ber_bvchr( id, ':' );
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	if ( BER_BVISNULL( user ) ) {
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		return LDAP_PROTOCOL_ERROR;
	}
	user->bv_val[ 0 ] = '\0';
	user->bv_val++;
	user->bv_len = id->bv_len - ( user->bv_val - id->bv_val );

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	mech->bv_val = ber_bvchr( id, '.' );
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	if ( !BER_BVISNULL( mech ) ) {
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		mech->bv_val[ 0 ] = '\0';
		mech->bv_val++;
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		mech->bv_len = user->bv_val - mech->bv_val - 1;
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		realm->bv_val = ber_bvchr( mech, '/' );
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		if ( !BER_BVISNULL( realm ) ) {
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			realm->bv_val[ 0 ] = '\0';
			realm->bv_val++;
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			mech->bv_len = realm->bv_val - mech->bv_val - 1;
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			realm->bv_len = user->bv_val - realm->bv_val - 1;
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		}
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	} else {
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		BER_BVZERO( realm );
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	}

	if ( id->bv_val[ 1 ] != '\0' ) {
		return LDAP_PROTOCOL_ERROR;
	}

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	if ( !BER_BVISNULL( mech ) ) {
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		if ( mech->bv_val != id->bv_val + 2 )
			return LDAP_PROTOCOL_ERROR;
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		AC_MEMCPY( mech->bv_val - 2, mech->bv_val, mech->bv_len + 1 );
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		mech->bv_val -= 2;
	}

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	if ( !BER_BVISNULL( realm ) ) {
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		if ( realm->bv_val < id->bv_val + 2 )
			return LDAP_PROTOCOL_ERROR;
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		AC_MEMCPY( realm->bv_val - 2, realm->bv_val, realm->bv_len + 1 );
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		realm->bv_val -= 2;
	}

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	/* leave "u:" before user */
	user->bv_val -= 2;
	user->bv_len += 2;
	user->bv_val[ 0 ] = u;
	user->bv_val[ 1 ] = ':';
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	return LDAP_SUCCESS;
}

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int
authzValidate(
	Syntax *syntax,
	struct berval *in )
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{
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	struct berval	bv;
	int		rc = LDAP_INVALID_SYNTAX;
	LDAPURLDesc	*ludp = NULL;
	int		scope = -1;

	/*
	 * 1) <DN>
	 * 2) dn[.{exact|children|subtree|onelevel}]:{*|<DN>}
	 * 3) dn.regex:<pattern>
	 * 4) u[.mech[/realm]]:<ID>
	 * 5) group[/<groupClass>[/<memberAttr>]]:<DN>
	 * 6) <URL>
	 */

	assert( in != NULL );
	assert( !BER_BVISNULL( in ) );

	Debug( LDAP_DEBUG_TRACE,
		"authzValidate: parsing %s\n", in->bv_val, 0, 0 );

	/*
	 * 2) dn[.{exact|children|subtree|onelevel}]:{*|<DN>}
	 * 3) dn.regex:<pattern>
	 *
	 * <DN> must pass DN normalization
	 */
	if ( !strncasecmp( in->bv_val, "dn", STRLENOF( "dn" ) ) ) {
		bv.bv_val = in->bv_val + STRLENOF( "dn" );

		if ( bv.bv_val[ 0 ] == '.' ) {
			bv.bv_val++;

			if ( !strncasecmp( bv.bv_val, "exact:", STRLENOF( "exact:" ) ) ) {
				bv.bv_val += STRLENOF( "exact:" );
				scope = LDAP_X_SCOPE_EXACT;

			} else if ( !strncasecmp( bv.bv_val, "regex:", STRLENOF( "regex:" ) ) ) {
				bv.bv_val += STRLENOF( "regex:" );
				scope = LDAP_X_SCOPE_REGEX;

			} else if ( !strncasecmp( bv.bv_val, "children:", STRLENOF( "children:" ) ) ) {
				bv.bv_val += STRLENOF( "children:" );
				scope = LDAP_X_SCOPE_CHILDREN;

			} else if ( !strncasecmp( bv.bv_val, "subtree:", STRLENOF( "subtree:" ) ) ) {
				bv.bv_val += STRLENOF( "subtree:" );
				scope = LDAP_X_SCOPE_SUBTREE;

			} else if ( !strncasecmp( bv.bv_val, "onelevel:", STRLENOF( "onelevel:" ) ) ) {
				bv.bv_val += STRLENOF( "onelevel:" );
				scope = LDAP_X_SCOPE_ONELEVEL;

			} else {
				return LDAP_INVALID_SYNTAX;
			}

		} else {
			if ( bv.bv_val[ 0 ] != ':' ) {
				return LDAP_INVALID_SYNTAX;
			}
			scope = LDAP_X_SCOPE_EXACT;
			bv.bv_val++;
		}

		bv.bv_val += strspn( bv.bv_val, " " );
		/* jump here in case no type specification was present
		 * and uri was not an URI... HEADS-UP: assuming EXACT */
is_dn:		bv.bv_len = in->bv_len - ( bv.bv_val - in->bv_val );

		/* a single '*' means any DN without using regexes */
		if ( ber_bvccmp( &bv, '*' ) ) {
			/* LDAP_X_SCOPE_USERS */
			return LDAP_SUCCESS;
		}

		switch ( scope ) {
		case LDAP_X_SCOPE_EXACT:
		case LDAP_X_SCOPE_CHILDREN:
		case LDAP_X_SCOPE_SUBTREE:
		case LDAP_X_SCOPE_ONELEVEL:
			return dnValidate( NULL, &bv );

		case LDAP_X_SCOPE_REGEX:
			return LDAP_SUCCESS;
		}

		return rc;

	/*
	 * 4) u[.mech[/realm]]:<ID>
	 */
	} else if ( ( in->bv_val[ 0 ] == 'u' || in->bv_val[ 0 ] == 'U' )
			&& ( in->bv_val[ 1 ] == ':' 
				|| in->bv_val[ 1 ] == '/' 
				|| in->bv_val[ 1 ] == '.' ) )
	{
		char		buf[ SLAP_LDAPDN_MAXLEN ];
		struct berval	id,
				user = BER_BVNULL,
				realm = BER_BVNULL,
				mech = BER_BVNULL;

		if ( sizeof( buf ) <= in->bv_len ) {
			return LDAP_INVALID_SYNTAX;
		}

		id.bv_len = in->bv_len;
		id.bv_val = buf;
		strncpy( buf, in->bv_val, sizeof( buf ) );

		rc = slap_parse_user( &id, &user, &realm, &mech );
		if ( rc != LDAP_SUCCESS ) {
			return LDAP_INVALID_SYNTAX;
		}

		return rc;

	/*
	 * 5) group[/groupClass[/memberAttr]]:<DN>
	 *
	 * <groupClass> defaults to "groupOfNames"
	 * <memberAttr> defaults to "member"
	 * 
	 * <DN> must pass DN normalization
	 */
	} else if ( strncasecmp( in->bv_val, "group", STRLENOF( "group" ) ) == 0 )
	{
		struct berval	group_dn = BER_BVNULL,
				group_oc = BER_BVNULL,
				member_at = BER_BVNULL;

		bv.bv_val = in->bv_val + STRLENOF( "group" );
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		bv.bv_len = in->bv_len - STRLENOF( "group" );
		group_dn.bv_val = ber_bvchr( &bv, ':' );
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		if ( group_dn.bv_val == NULL ) {
			/* last chance: assume it's a(n exact) DN ... */
			bv.bv_val = in->bv_val;
			scope = LDAP_X_SCOPE_EXACT;
			goto is_dn;
		}
		
		/*
		 * FIXME: we assume that "member" and "groupOfNames"
		 * are present in schema...
		 */
		if ( bv.bv_val[ 0 ] == '/' ) {
			group_oc.bv_val = &bv.bv_val[ 1 ];
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			group_oc.bv_len = group_dn.bv_val - group_oc.bv_val;
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			member_at.bv_val = ber_bvchr( &group_oc, '/' );
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			if ( member_at.bv_val ) {
				AttributeDescription	*ad = NULL;
				const char		*text = NULL;

				group_oc.bv_len = member_at.bv_val - group_oc.bv_val;
				member_at.bv_val++;
				member_at.bv_len = group_dn.bv_val - member_at.bv_val;
				rc = slap_bv2ad( &member_at, &ad, &text );
				if ( rc != LDAP_SUCCESS ) {
					return rc;
				}
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			}
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			if ( oc_bvfind( &group_oc ) == NULL ) {
				return LDAP_INVALID_SYNTAX;
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			}
		}

		group_dn.bv_val++;
		group_dn.bv_len = in->bv_len - ( group_dn.bv_val - in->bv_val );

		rc = dnValidate( NULL, &group_dn );
		if ( rc != LDAP_SUCCESS ) {
			return rc;
		}

		return rc;
	}

	/*
	 * ldap:///<base>??<scope>?<filter>
	 * <scope> ::= {base|one|subtree}
	 *
	 * <scope> defaults to "base"
	 * <base> must pass DN normalization
	 * <filter> must pass str2filter()
	 */
	rc = ldap_url_parse( in->bv_val, &ludp );
	switch ( rc ) {
	case LDAP_URL_SUCCESS:
		/* FIXME: the check is pedantic, but I think it's necessary,
		 * because people tend to use things like ldaps:// which
		 * gives the idea SSL is being used.  Maybe we could
		 * accept ldapi:// as well, but the point is that we use
		 * an URL as an easy means to define bits of a search with
		 * little parsing.
		 */
		if ( strcasecmp( ludp->lud_scheme, "ldap" ) != 0 ) {
			/*
			 * must be ldap:///
			 */
			rc = LDAP_INVALID_SYNTAX;
			goto done;
		}
		break;

	case LDAP_URL_ERR_BADSCHEME:
		/*
		 * last chance: assume it's a(n exact) DN ...
		 *
		 * NOTE: must pass DN normalization
		 */
		ldap_free_urldesc( ludp );
		bv.bv_val = in->bv_val;
		scope = LDAP_X_SCOPE_EXACT;
		goto is_dn;

	default:
		rc = LDAP_INVALID_SYNTAX;
		goto done;
	}

	if ( ( ludp->lud_host && *ludp->lud_host )
		|| ludp->lud_attrs || ludp->lud_exts )
	{
		/* host part must be empty */
		/* attrs and extensions parts must be empty */
		rc = LDAP_INVALID_SYNTAX;
		goto done;
	}

	/* Grab the filter */
	if ( ludp->lud_filter ) {
		Filter	*f = str2filter( ludp->lud_filter );
		if ( f == NULL ) {
			rc = LDAP_INVALID_SYNTAX;
			goto done;
		}
		filter_free( f );
	}

	/* Grab the searchbase */
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	if ( ludp->lud_dn != NULL ) {
		ber_str2bv( ludp->lud_dn, 0, 0, &bv );
		rc = dnValidate( NULL, &bv );
	} else {
		rc = LDAP_INVALID_SYNTAX;
	}
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done:
	ldap_free_urldesc( ludp );
	return( rc );
}

static int
authzPrettyNormal(
	struct berval	*val,
	struct berval	*normalized,
	void		*ctx,
	int		normalize )
{
	struct berval	bv;
	int		rc = LDAP_INVALID_SYNTAX;
	LDAPURLDesc	*ludp = NULL;
	char		*lud_dn = NULL,
			*lud_filter = NULL;
	int		scope = -1;

	/*
	 * 1) <DN>
	 * 2) dn[.{exact|children|subtree|onelevel}]:{*|<DN>}
	 * 3) dn.regex:<pattern>
	 * 4) u[.mech[/realm]]:<ID>
	 * 5) group[/<groupClass>[/<memberAttr>]]:<DN>
	 * 6) <URL>
	 */

	assert( val != NULL );
	assert( !BER_BVISNULL( val ) );
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	BER_BVZERO( normalized );
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	/*
	 * 2) dn[.{exact|children|subtree|onelevel}]:{*|<DN>}
	 * 3) dn.regex:<pattern>
	 *
	 * <DN> must pass DN normalization
	 */
	if ( !strncasecmp( val->bv_val, "dn", STRLENOF( "dn" ) ) ) {
		struct berval	out = BER_BVNULL,
				prefix = BER_BVNULL;
		char		*ptr;

		bv.bv_val = val->bv_val + STRLENOF( "dn" );

		if ( bv.bv_val[ 0 ] == '.' ) {
			bv.bv_val++;

			if ( !strncasecmp( bv.bv_val, "exact:", STRLENOF( "exact:" ) ) ) {
				bv.bv_val += STRLENOF( "exact:" );
				scope = LDAP_X_SCOPE_EXACT;

			} else if ( !strncasecmp( bv.bv_val, "regex:", STRLENOF( "regex:" ) ) ) {
				bv.bv_val += STRLENOF( "regex:" );
				scope = LDAP_X_SCOPE_REGEX;

			} else if ( !strncasecmp( bv.bv_val, "children:", STRLENOF( "children:" ) ) ) {
				bv.bv_val += STRLENOF( "children:" );
				scope = LDAP_X_SCOPE_CHILDREN;

			} else if ( !strncasecmp( bv.bv_val, "subtree:", STRLENOF( "subtree:" ) ) ) {
				bv.bv_val += STRLENOF( "subtree:" );
				scope = LDAP_X_SCOPE_SUBTREE;

			} else if ( !strncasecmp( bv.bv_val, "onelevel:", STRLENOF( "onelevel:" ) ) ) {
				bv.bv_val += STRLENOF( "onelevel:" );
				scope = LDAP_X_SCOPE_ONELEVEL;

			} else {
				return LDAP_INVALID_SYNTAX;
			}

		} else {
			if ( bv.bv_val[ 0 ] != ':' ) {
				return LDAP_INVALID_SYNTAX;
			}
			scope = LDAP_X_SCOPE_EXACT;
			bv.bv_val++;
		}

		bv.bv_val += strspn( bv.bv_val, " " );
		/* jump here in case no type specification was present
		 * and uri was not an URI... HEADS-UP: assuming EXACT */
is_dn:		bv.bv_len = val->bv_len - ( bv.bv_val - val->bv_val );

		/* a single '*' means any DN without using regexes */
		if ( ber_bvccmp( &bv, '*' ) ) {
			ber_str2bv_x( "dn:*", STRLENOF( "dn:*" ), 1, normalized, ctx );
			return LDAP_SUCCESS;
		}

		switch ( scope ) {
		case LDAP_X_SCOPE_EXACT:
		case LDAP_X_SCOPE_CHILDREN:
		case LDAP_X_SCOPE_SUBTREE:
		case LDAP_X_SCOPE_ONELEVEL:
			if ( normalize ) {
				rc = dnNormalize( 0, NULL, NULL, &bv, &out, ctx );
			} else {
				rc = dnPretty( NULL, &bv, &out, ctx );
			}
			if( rc != LDAP_SUCCESS ) {
				return LDAP_INVALID_SYNTAX;
			}
			break;

		case LDAP_X_SCOPE_REGEX:
			normalized->bv_len = STRLENOF( "dn.regex:" ) + bv.bv_len;
			normalized->bv_val = ber_memalloc_x( normalized->bv_len + 1, ctx );
			ptr = lutil_strcopy( normalized->bv_val, "dn.regex:" );
			ptr = lutil_strncopy( ptr, bv.bv_val, bv.bv_len );
			ptr[ 0 ] = '\0';
			return LDAP_SUCCESS;

		default:
			return LDAP_INVALID_SYNTAX;
		}

		/* prepare prefix */
		switch ( scope ) {
		case LDAP_X_SCOPE_EXACT:
			BER_BVSTR( &prefix, "dn:" );
			break;

		case LDAP_X_SCOPE_CHILDREN:
			BER_BVSTR( &prefix, "dn.children:" );
			break;

		case LDAP_X_SCOPE_SUBTREE:
			BER_BVSTR( &prefix, "dn.subtree:" );
			break;

		case LDAP_X_SCOPE_ONELEVEL:
			BER_BVSTR( &prefix, "dn.onelevel:" );
			break;

		default:
			assert( 0 );
			break;
		}

		normalized->bv_len = prefix.bv_len + out.bv_len;
		normalized->bv_val = ber_memalloc_x( normalized->bv_len + 1, ctx );
		
		ptr = lutil_strcopy( normalized->bv_val, prefix.bv_val );
		ptr = lutil_strncopy( ptr, out.bv_val, out.bv_len );
		ptr[ 0 ] = '\0';
		ber_memfree_x( out.bv_val, ctx );

		return LDAP_SUCCESS;

	/*
	 * 4) u[.mech[/realm]]:<ID>
	 */
	} else if ( ( val->bv_val[ 0 ] == 'u' || val->bv_val[ 0 ] == 'U' )
			&& ( val->bv_val[ 1 ] == ':' 
				|| val->bv_val[ 1 ] == '/' 
				|| val->bv_val[ 1 ] == '.' ) )
	{
		char		buf[ SLAP_LDAPDN_MAXLEN ];
		struct berval	id,
				user = BER_BVNULL,
				realm = BER_BVNULL,
				mech = BER_BVNULL;

		if ( sizeof( buf ) <= val->bv_len ) {
			return LDAP_INVALID_SYNTAX;
		}

		id.bv_len = val->bv_len;
		id.bv_val = buf;
		strncpy( buf, val->bv_val, sizeof( buf ) );

		rc = slap_parse_user( &id, &user, &realm, &mech );
		if ( rc != LDAP_SUCCESS ) {
			return LDAP_INVALID_SYNTAX;
		}

		ber_dupbv_x( normalized, val, ctx );

		return rc;

	/*
	 * 5) group[/groupClass[/memberAttr]]:<DN>
	 *
	 * <groupClass> defaults to "groupOfNames"
	 * <memberAttr> defaults to "member"
	 * 
	 * <DN> must pass DN normalization
	 */
	} else if ( strncasecmp( val->bv_val, "group", STRLENOF( "group" ) ) == 0 )
	{
		struct berval	group_dn = BER_BVNULL,
				group_oc = BER_BVNULL,
				member_at = BER_BVNULL,
				out = BER_BVNULL;
		char		*ptr;

		bv.bv_val = val->bv_val + STRLENOF( "group" );
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		bv.bv_len = val->bv_len - STRLENOF( "group" );
		group_dn.bv_val = ber_bvchr( &bv, ':' );
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		if ( group_dn.bv_val == NULL ) {
			/* last chance: assume it's a(n exact) DN ... */
			bv.bv_val = val->bv_val;
			scope = LDAP_X_SCOPE_EXACT;
			goto is_dn;
		}

		/*
		 * FIXME: we assume that "member" and "groupOfNames"
		 * are present in schema...
		 */
		if ( bv.bv_val[ 0 ] == '/' ) {
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			ObjectClass		*oc = NULL;

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			group_oc.bv_val = &bv.bv_val[ 1 ];
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			group_oc.bv_len = group_dn.bv_val - group_oc.bv_val;
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			member_at.bv_val = ber_bvchr( &group_oc, '/' );
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			if ( member_at.bv_val ) {
				AttributeDescription	*ad = NULL;
				const char		*text = NULL;

				group_oc.bv_len = member_at.bv_val - group_oc.bv_val;
				member_at.bv_val++;
				member_at.bv_len = group_dn.bv_val - member_at.bv_val;
				rc = slap_bv2ad( &member_at, &ad, &text );
				if ( rc != LDAP_SUCCESS ) {
					return rc;
				}

				member_at = ad->ad_cname;

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			}
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			oc = oc_bvfind( &group_oc );
			if ( oc == NULL ) {
				return LDAP_INVALID_SYNTAX;
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			}
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			group_oc = oc->soc_cname;
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		}

		group_dn.bv_val++;
		group_dn.bv_len = val->bv_len - ( group_dn.bv_val - val->bv_val );

		if ( normalize ) {
			rc = dnNormalize( 0, NULL, NULL, &group_dn, &out, ctx );
		} else {
			rc = dnPretty( NULL, &group_dn, &out, ctx );
		}
		if ( rc != LDAP_SUCCESS ) {
			return rc;
		}

		normalized->bv_len = STRLENOF( "group" ":" ) + out.bv_len;
		if ( !BER_BVISNULL( &group_oc ) ) {
			normalized->bv_len += STRLENOF( "/" ) + group_oc.bv_len;
			if ( !BER_BVISNULL( &member_at ) ) {
				normalized->bv_len += STRLENOF( "/" ) + member_at.bv_len;
			}
		}

		normalized->bv_val = ber_memalloc_x( normalized->bv_len + 1, ctx );
		ptr = lutil_strcopy( normalized->bv_val, "group" );
		if ( !BER_BVISNULL( &group_oc ) ) {
			ptr[ 0 ] = '/';
			ptr++;
			ptr = lutil_strncopy( ptr, group_oc.bv_val, group_oc.bv_len );
			if ( !BER_BVISNULL( &member_at ) ) {
				ptr[ 0 ] = '/';
				ptr++;
				ptr = lutil_strncopy( ptr, member_at.bv_val, member_at.bv_len );
			}
		}
		ptr[ 0 ] = ':';
		ptr++;
		ptr = lutil_strncopy( ptr, out.bv_val, out.bv_len );
		ptr[ 0 ] = '\0';
		ber_memfree_x( out.bv_val, ctx );

		return rc;
	}

	/*
	 * ldap:///<base>??<scope>?<filter>
	 * <scope> ::= {base|one|subtree}
	 *
	 * <scope> defaults to "base"
	 * <base> must pass DN normalization
	 * <filter> must pass str2filter()
	 */
	rc = ldap_url_parse( val->bv_val, &ludp );
	switch ( rc ) {
	case LDAP_URL_SUCCESS:
		/* FIXME: the check is pedantic, but I think it's necessary,
		 * because people tend to use things like ldaps:// which
		 * gives the idea SSL is being used.  Maybe we could
		 * accept ldapi:// as well, but the point is that we use
		 * an URL as an easy means to define bits of a search with
		 * little parsing.
		 */
		if ( strcasecmp( ludp->lud_scheme, "ldap" ) != 0 ) {
			/*
			 * must be ldap:///
			 */
			rc = LDAP_INVALID_SYNTAX;
			goto done;
		}

		AC_MEMCPY( ludp->lud_scheme, "ldap", STRLENOF( "ldap" ) );
		break;

	case LDAP_URL_ERR_BADSCHEME:
		/*
		 * last chance: assume it's a(n exact) DN ...
		 *
		 * NOTE: must pass DN normalization
		 */
		ldap_free_urldesc( ludp );
		bv.bv_val = val->bv_val;
		scope = LDAP_X_SCOPE_EXACT;
		goto is_dn;

	default:
		rc = LDAP_INVALID_SYNTAX;
		goto done;
	}

	if ( ( ludp->lud_host && *ludp->lud_host )
		|| ludp->lud_attrs || ludp->lud_exts )
	{
		/* host part must be empty */
		/* attrs and extensions parts must be empty */
		rc = LDAP_INVALID_SYNTAX;
		goto done;
	}

	/* Grab the filter */
	if ( ludp->lud_filter ) {
		struct berval	filterstr;
		Filter		*f;

		lud_filter = ludp->lud_filter;

		f = str2filter( lud_filter );
		if ( f == NULL ) {
			rc = LDAP_INVALID_SYNTAX;
			goto done;
		}
		filter2bv( f, &filterstr );
		filter_free( f );
		if ( BER_BVISNULL( &filterstr ) ) {
			rc = LDAP_INVALID_SYNTAX;
			goto done;
		}

		ludp->lud_filter = filterstr.bv_val;
	}

	/* Grab the searchbase */
	if ( ludp->lud_dn ) {
		struct berval	out = BER_BVNULL;

		lud_dn = ludp->lud_dn;

		ber_str2bv( lud_dn, 0, 0, &bv );
		if ( normalize ) {
			rc = dnNormalize( 0, NULL, NULL, &bv, &out, ctx );
		} else {
			rc = dnPretty( NULL, &bv, &out, ctx );
		}

		if ( rc != LDAP_SUCCESS ) {
			goto done;
		}

		ludp->lud_dn = out.bv_val;
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	} else {
		rc = LDAP_INVALID_SYNTAX;
		goto done;
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	}

	ludp->lud_port = 0;
	normalized->bv_val = ldap_url_desc2str( ludp );
	if ( normalized->bv_val ) {
		normalized->bv_len = strlen( normalized->bv_val );

	} else {
		rc = LDAP_INVALID_SYNTAX;
	}

done:
	if ( lud_filter ) {
		if ( ludp->lud_filter != lud_filter ) {
			ber_memfree( ludp->lud_filter );
		}
		ludp->lud_filter = lud_filter;
	}

	if ( lud_dn ) {
		if ( ludp->lud_dn != lud_dn ) {
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			ch_free( ludp->lud_dn );
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		}
		ludp->lud_dn = lud_dn;
	}

	ldap_free_urldesc( ludp );

	return( rc );
}

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

	Debug( LDAP_DEBUG_TRACE, ">>> authzNormalize: <%s>\n",
		val->bv_val, 0, 0 );

	rc = authzPrettyNormal( val, normalized, ctx, 1 );

	Debug( LDAP_DEBUG_TRACE, "<<< authzNormalize: <%s> (%d)\n",
		normalized->bv_val, rc, 0 );

	return rc;
}

int
authzPretty(
	Syntax *syntax,
	struct berval *val,
	struct berval *out,
	void *ctx)
{
	int		rc;

	Debug( LDAP_DEBUG_TRACE, ">>> authzPretty: <%s>\n",
		val->bv_val, 0, 0 );

	rc = authzPrettyNormal( val, out, ctx, 0 );

	Debug( LDAP_DEBUG_TRACE, "<<< authzPretty: <%s> (%d)\n",
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		out->bv_val ? out->bv_val : "(null)" , rc, 0 );
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	return rc;
}


static int
slap_parseURI(
	Operation	*op,
	struct berval	*uri,
	struct berval	*base,
	struct berval	*nbase,
	int		*scope,
	Filter		**filter,
	struct berval	*fstr,
	int		normalize )
{
	struct berval	bv;
	int		rc;
	LDAPURLDesc	*ludp;

	struct berval	idx;
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	assert( uri != NULL && !BER_BVISNULL( uri ) );
	BER_BVZERO( base );
	BER_BVZERO( nbase );
	BER_BVZERO( fstr );
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	*scope = -1;
	*filter = NULL;

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	Debug( LDAP_DEBUG_TRACE,
		"slap_parseURI: parsing %s\n", uri->bv_val, 0, 0 );
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	rc = LDAP_PROTOCOL_ERROR;
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	idx = *uri;
	if ( idx.bv_val[ 0 ] == '{' ) {
		char	*ptr;

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		ptr = ber_bvchr( &idx, '}' ) + 1;
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		assert( ptr != (void *)1 );

		idx.bv_len -= ptr - idx.bv_val;
		idx.bv_val = ptr;
		uri = &idx;
	}

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	/*
	 * dn[.<dnstyle>]:<dnpattern>
	 * <dnstyle> ::= {exact|regex|children|subtree|onelevel}
	 *
	 * <dnstyle> defaults to "exact"
	 * if <dnstyle> is not "regex", <dnpattern> must pass DN normalization
	 */
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	if ( !strncasecmp( uri->bv_val, "dn", STRLENOF( "dn" ) ) ) {
		bv.bv_val = uri->bv_val + STRLENOF( "dn" );
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		if ( bv.bv_val[ 0 ] == '.' ) {
			bv.bv_val++;
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			if ( !strncasecmp( bv.bv_val, "exact:", STRLENOF( "exact:" ) ) ) {
				bv.bv_val += STRLENOF( "exact:" );
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				*scope = LDAP_X_SCOPE_EXACT;
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			} else if ( !strncasecmp( bv.bv_val, "regex:", STRLENOF( "regex:" ) ) ) {
				bv.bv_val += STRLENOF( "regex:" );
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				*scope = LDAP_X_SCOPE_REGEX;
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			} else if ( !strncasecmp( bv.bv_val, "children:", STRLENOF( "children:" ) ) ) {
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				bv.bv_val += STRLENOF( "children:" );
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				*scope = LDAP_X_SCOPE_CHILDREN;
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			} else if ( !strncasecmp( bv.bv_val, "subtree:", STRLENOF( "subtree:" ) ) ) {
				bv.bv_val += STRLENOF( "subtree:" );
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				*scope = LDAP_X_SCOPE_SUBTREE;
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			} else if ( !strncasecmp( bv.bv_val, "onelevel:", STRLENOF( "onelevel:" ) ) ) {
				bv.bv_val += STRLENOF( "onelevel:" );
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				*scope = LDAP_X_SCOPE_ONELEVEL;

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			} else {
				return LDAP_PROTOCOL_ERROR;
			}
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		} else {
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			if ( bv.bv_val[ 0 ] != ':' ) {
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				return LDAP_PROTOCOL_ERROR;
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			}
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			*scope = LDAP_X_SCOPE_EXACT;
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			bv.bv_val++;
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		}
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		bv.bv_val += strspn( bv.bv_val, " " );
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		/* jump here in case no type specification was present
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		 * and uri was not an URI... HEADS-UP: assuming EXACT */
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is_dn:		bv.bv_len = uri->bv_len - (bv.bv_val - uri->bv_val);
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		/* a single '*' means any DN without using regexes */
		if ( ber_bvccmp( &bv, '*' ) ) {
			*scope = LDAP_X_SCOPE_USERS;
		}

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		switch ( *scope ) {
		case LDAP_X_SCOPE_EXACT:
		case LDAP_X_SCOPE_CHILDREN:
		case LDAP_X_SCOPE_SUBTREE:
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		case LDAP_X_SCOPE_ONELEVEL:
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			if ( normalize ) {
				rc = dnNormalize( 0, NULL, NULL, &bv, nbase, op->o_tmpmemctx );
				if( rc != LDAP_SUCCESS ) {
					*scope = -1;
				}
			} else {
				ber_dupbv_x( nbase, &bv, op->o_tmpmemctx );
				rc = LDAP_SUCCESS;
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			}
			break;
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		case LDAP_X_SCOPE_REGEX:
			ber_dupbv_x( nbase, &bv, op->o_tmpmemctx );
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		case LDAP_X_SCOPE_USERS:
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			rc = LDAP_SUCCESS;
			break;

		default:
			*scope = -1;
			break;
		}

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		return rc;
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	/*
	 * u:<uid>
	 */
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	} else if ( ( uri->bv_val[ 0 ] == 'u' || uri->bv_val[ 0 ] == 'U' )
			&& ( uri->bv_val[ 1 ] == ':' 
				|| uri->bv_val[ 1 ] == '/' 
				|| uri->bv_val[ 1 ] == '.' ) )
	{
		Connection	c = *op->o_conn;
		char		buf[ SLAP_LDAPDN_MAXLEN ];
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		struct berval	id,
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				user = BER_BVNULL,
				realm = BER_BVNULL,
				mech = BER_BVNULL;
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		if ( sizeof( buf ) <= uri->bv_len ) {
			return LDAP_INVALID_SYNTAX;
		}

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		id.bv_len = uri->bv_len;
		id.bv_val = buf;
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		strncpy( buf, uri->bv_val, sizeof( buf ) );

		rc = slap_parse_user( &id, &user, &realm, &mech );
		if ( rc != LDAP_SUCCESS ) {
			return rc;
		}

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		if ( !BER_BVISNULL( &mech ) ) {
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			c.c_sasl_bind_mech = mech;
		} else {
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			BER_BVSTR( &c.c_sasl_bind_mech, "AUTHZ" );
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		}
		
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		rc = slap_sasl_getdn( &c, op, &user,
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				realm.bv_val, nbase, SLAP_GETDN_AUTHZID );

		if ( rc == LDAP_SUCCESS ) {
			*scope = LDAP_X_SCOPE_EXACT;
		}

		return rc;
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	/*
	 * group[/<groupoc>[/<groupat>]]:<groupdn>
	 *
	 * groupoc defaults to "groupOfNames"
	 * groupat defaults to "member"
	 * 
	 * <groupdn> must pass DN normalization
	 */
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	} else if ( strncasecmp( uri->bv_val, "group", STRLENOF( "group" ) ) == 0 )
	{
		struct berval	group_dn = BER_BVNULL,
				group_oc = BER_BVNULL,
				member_at = BER_BVNULL;
		char		*tmp;

		bv.bv_val = uri->bv_val + STRLENOF( "group" );
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		bv.bv_len = uri->bv_len - STRLENOF( "group" );
		group_dn.bv_val = ber_bvchr( &bv, ':' );
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		if ( group_dn.bv_val == NULL ) {
			/* last chance: assume it's a(n exact) DN ... */
			bv.bv_val = uri->bv_val;
			*scope = LDAP_X_SCOPE_EXACT;
			goto is_dn;
		}
		
		if ( bv.bv_val[ 0 ] == '/' ) {
			group_oc.bv_val = &bv.bv_val[ 1 ];
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			group_oc.bv_len = group_dn.bv_val - group_oc.bv_val;
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			member_at.bv_val = ber_bvchr( &group_oc, '/' );
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			if ( member_at.bv_val ) {
				group_oc.bv_len = member_at.bv_val - group_oc.bv_val;
				member_at.bv_val++;
				member_at.bv_len = group_dn.bv_val - member_at.bv_val;

			} else {
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				BER_BVSTR( &member_at, SLAPD_GROUP_ATTR );
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			}

		} else {
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			BER_BVSTR( &group_oc, SLAPD_GROUP_CLASS );
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			BER_BVSTR( &member_at, SLAPD_GROUP_ATTR );
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		}
		group_dn.bv_val++;
		group_dn.bv_len = uri->bv_len - ( group_dn.bv_val - uri->bv_val );

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		if ( normalize ) {
			rc = dnNormalize( 0, NULL, NULL, &group_dn, nbase, op->o_tmpmemctx );
			if ( rc != LDAP_SUCCESS ) {
				*scope = -1;
				return rc;
			}
		} else {
			ber_dupbv_x( nbase, &group_dn, op->o_tmpmemctx );
			rc = LDAP_SUCCESS;
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		}
		*scope = LDAP_X_SCOPE_GROUP;

		/* FIXME: caller needs to add value of member attribute
		 * and close brackets twice */
		fstr->bv_len = STRLENOF( "(&(objectClass=)(=" /* )) */ )
			+ group_oc.bv_len + member_at.bv_len;
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		fstr->bv_val = ch_malloc( fstr->bv_len + 1 );

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		tmp = lutil_strncopy( fstr->bv_val, "(&(objectClass=" /* )) */ ,
				STRLENOF( "(&(objectClass=" /* )) */ ) );
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		tmp = lutil_strncopy( tmp, group_oc.bv_val, group_oc.bv_len );
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		tmp = lutil_strncopy( tmp, /* ( */ ")(" /* ) */ ,
				STRLENOF( /* ( */ ")(" /* ) */ ) );
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		tmp = lutil_strncopy( tmp, member_at.bv_val, member_at.bv_len );
		tmp = lutil_strncopy( tmp, "=", STRLENOF( "=" ) );

		return rc;
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	}
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	/*
	 * ldap:///<base>??<scope>?<filter>
	 * <scope> ::= {base|one|subtree}
	 *
	 * <scope> defaults to "base"
	 * <base> must pass DN normalization
	 * <filter> must pass str2filter()
	 */
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	rc = ldap_url_parse( uri->bv_val, &ludp );
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	switch ( rc ) {
	case LDAP_URL_SUCCESS:
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		/* FIXME: the check is pedantic, but I think it's necessary,
		 * because people tend to use things like ldaps:// which
		 * gives the idea SSL is being used.  Maybe we could
		 * accept ldapi:// as well, but the point is that we use
		 * an URL as an easy means to define bits of a search with
		 * little parsing.
		 */
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		if ( strcasecmp( ludp->lud_scheme, "ldap" ) != 0 ) {
			/*
			 * must be ldap:///
			 */
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			rc = LDAP_PROTOCOL_ERROR;
			goto done;
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		}
		break;

	case LDAP_URL_ERR_BADSCHEME:
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		/*
		 * last chance: assume it's a(n exact) DN ...
		 *
		 * NOTE: must pass DN normalization
		 */
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		ldap_free_urldesc( ludp );
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		bv.bv_val = uri->bv_val;
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		*scope = LDAP_X_SCOPE_EXACT;
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		goto is_dn;
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	default:
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		rc = LDAP_PROTOCOL_ERROR;
		goto done;
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	}
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	if ( ( ludp->lud_host && *ludp->lud_host )
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		|| ludp->lud_attrs || ludp->lud_exts )
	{
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		/* host part must be empty */
		/* attrs and extensions parts must be empty */
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		rc = LDAP_PROTOCOL_ERROR;
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		goto done;
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	}
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	/* Grab the scope */
	*scope = ludp->lud_scope;
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	/* Grab the filter */
	if ( ludp->lud_filter ) {
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		*filter = str2filter_x( op, ludp->lud_filter );
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		if ( *filter == NULL ) {
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			rc = LDAP_PROTOCOL_ERROR;
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			goto done;
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		}
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		ber_str2bv( ludp->lud_filter, 0, 0, fstr );
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	}

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	/* Grab the searchbase */
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	ber_str2bv( ludp->lud_dn, 0, 0, base );
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	if ( normalize ) {
		rc = dnNormalize( 0, NULL, NULL, base, nbase, op->o_tmpmemctx );
	} else {
		ber_dupbv_x( nbase, base, op->o_tmpmemctx );
		rc = LDAP_SUCCESS;
	}
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done:
	if( rc != LDAP_SUCCESS ) {
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		if( *filter ) {
			filter_free_x( op, *filter, 1 );
			*filter = NULL;
		}
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		BER_BVZERO( base );
		BER_BVZERO( fstr );
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	} else {
		/* Don't free these, return them to caller */
		ludp->lud_filter = NULL;
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		ludp->lud_dn = NULL;
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	}
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	ldap_free_urldesc( ludp );
	return( rc );
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}

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#ifndef SLAP_AUTH_REWRITE
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static int slap_sasl_rx_off(char *rep, int *off)
{
	const char *c;
	int n;

	/* Precompile replace pattern. Find the $<n> placeholders */
	off[0] = -2;
	n = 1;
	for ( c = rep;	 *c;  c++ ) {
		if ( *c == '\\' && c[1] ) {
			c++;
			continue;
		}
		if ( *c == '$' ) {
			if ( n == SASLREGEX_REPLACE ) {
				Debug( LDAP_DEBUG_ANY,
					"SASL replace pattern %s has too many $n "
						"placeholders (max %d)\n",
					rep, SASLREGEX_REPLACE, 0 );

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				return( LDAP_OTHER );
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			}
			off[n] = c - rep;
			n++;
		}
	}

	/* Final placeholder, after the last $n */
	off[n] = c - rep;
	n++;
	off[n] = -1;
	return( LDAP_SUCCESS );
}
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#endif /* ! SLAP_AUTH_REWRITE */
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#ifdef SLAP_AUTH_REWRITE
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int slap_sasl_rewrite_config( 
		const char	*fname,
		int		lineno,
		int		argc,
		char		**argv
)
{
	int	rc;
	char	*savearg0;

	/* init at first call */
	if ( sasl_rwinfo == NULL ) {
 		sasl_rwinfo = rewrite_info_init( REWRITE_MODE_USE_DEFAULT );
	}

	/* strip "authid-" prefix for parsing */
	savearg0 = argv[0];
	argv[0] += STRLENOF( "authid-" );
 	rc = rewrite_parse( sasl_rwinfo, fname, lineno, argc, argv );
	argv[0] = savearg0;

	return rc;
}

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static int
slap_sasl_rewrite_destroy( void )
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{
	if ( sasl_rwinfo ) {
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		rewrite_info_delete( &sasl_rwinfo );
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		sasl_rwinfo = NULL;
	}

	return 0;
}

int slap_sasl_regexp_rewrite_config(
		const char	*fname,
		int		lineno,
		const char	*match,
		const char	*replace,
		const char	*context )
{
	int	rc;
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	char	*argvRule[] = { "rewriteRule", NULL, NULL, ":@", NULL };
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	/* init at first call */
	if ( sasl_rwinfo == NULL ) {
		char *argvEngine[] = { "rewriteEngine", "on", NULL };
		char *argvContext[] = { "rewriteContext", NULL, NULL };

		/* initialize rewrite engine */
 		sasl_rwinfo = rewrite_info_init( REWRITE_MODE_USE_DEFAULT );

		/* switch on rewrite engine */
 		rc = rewrite_parse( sasl_rwinfo, fname, lineno, 2, argvEngine );
 		if (rc != LDAP_SUCCESS) {
			return rc;
		}

		/* create generic authid context */
		argvContext[1] = AUTHID_CONTEXT;
 		rc = rewrite_parse( sasl_rwinfo, fname, lineno, 2, argvContext );
 		if (rc != LDAP_SUCCESS) {
			return rc;
		}
	}

	argvRule[1] = (char *)match;
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	argvRule[2] = (char *)replace;
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 	rc = rewrite_parse( sasl_rwinfo, fname, lineno, 4, argvRule );

	return rc;
}
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#endif /* SLAP_AUTH_REWRITE */
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int slap_sasl_regexp_config( const char *match, const char *replace )
{
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	int rc;
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	SaslRegexp_t *reg;

	SaslRegexp = (SaslRegexp_t *) ch_realloc( (char *) SaslRegexp,
	  (nSaslRegexp + 1) * sizeof(SaslRegexp_t) );
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	reg = &SaslRegexp[nSaslRegexp];

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#ifdef SLAP_AUTH_REWRITE
	rc = slap_sasl_regexp_rewrite_config( "sasl-regexp", 0,
			match, replace, AUTHID_CONTEXT );
#else /* ! SLAP_AUTH_REWRITE */

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	/* Precompile matching pattern */
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	rc = regcomp( &reg->sr_workspace, match, REG_EXTENDED|REG_ICASE );
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	if ( rc ) {
		Debug( LDAP_DEBUG_ANY,
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			"SASL match pattern %s could not be compiled by regexp engine\n",
			match, 0, 0 );
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#ifdef ENABLE_REWRITE
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		/* Dummy block to force symbol references in librewrite */
		if ( slapMode == ( SLAP_SERVER_MODE|SLAP_TOOL_MODE )) {
			rewrite_info_init( 0 );
		}
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#endif
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		return( LDAP_OTHER );
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	}

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	rc = slap_sasl_rx_off( replace, reg->sr_offset );
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#endif /* ! SLAP_AUTH_REWRITE */
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	if ( rc == LDAP_SUCCESS ) {
		reg->sr_match = ch_strdup( match );
		reg->sr_replace = ch_strdup( replace );

		nSaslRegexp++;
	}

	return rc;
}

void
slap_sasl_regexp_destroy( void )
{
	if ( SaslRegexp ) {
		int	n;

		for ( n = 0; n < nSaslRegexp; n++ ) {
			ch_free( SaslRegexp[ n ].sr_match );
			ch_free( SaslRegexp[ n ].sr_replace );
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			regfree( &SaslRegexp[ n ].sr_workspace );
#endif /* SLAP_AUTH_REWRITE */
		}

		ch_free( SaslRegexp );
	}

#ifdef SLAP_AUTH_REWRITE
	slap_sasl_rewrite_destroy();
#endif /* SLAP_AUTH_REWRITE */
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}

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void slap_sasl_regexp_unparse( BerVarray *out )
{
	int i;
	BerVarray bva = NULL;
	char ibuf[32], *ptr;
	struct berval idx;

	if ( !nSaslRegexp ) return;

	idx.bv_val = ibuf;
	bva = ch_malloc( (nSaslRegexp+1) * sizeof(struct berval) );
	BER_BVZERO(bva+nSaslRegexp);
	for ( i=0; i<nSaslRegexp; i++ ) {
		idx.bv_len = sprintf( idx.bv_val, "{%d}", i);
		bva[i].bv_len = idx.bv_len + strlen( SaslRegexp[i].sr_match ) +
			strlen( SaslRegexp[i].sr_replace ) + 5;
		bva[i].bv_val = ch_malloc( bva[i].bv_len+1 );
		ptr = lutil_strcopy( bva[i].bv_val, ibuf );
		*ptr++ = '"';
		ptr = lutil_strcopy( ptr, SaslRegexp[i].sr_match );
		ptr = lutil_strcopy( ptr, "\" \"" );
		ptr = lutil_strcopy( ptr, SaslRegexp[i].sr_replace );
		*ptr++ = '"';
		*ptr = '\0';
	}
	*out = bva;
}

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#ifndef SLAP_AUTH_REWRITE
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/* Perform replacement on regexp matches */
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static void slap_sasl_rx_exp(
	const char *rep,
	const int *off,
	regmatch_t *str,
	const char *saslname,
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	struct berval *out,
	void *ctx )
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{
	int i, n, len, insert;

	/* Get the total length of the final URI */

	n=1;
	len = 0;
	while( off[n] >= 0 ) {
		/* Len of next section from replacement string (x,y,z above) */
		len += off[n] - off[n-1] - 2;
		if( off[n+1] < 0)
			break;

		/* Len of string from saslname that matched next $i  (b,d above) */
		i = rep[ off[n] + 1 ]	- '0';
		len += str[i].rm_eo - str[i].rm_so;
		n++;
	}
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	out->bv_val = slap_sl_malloc( len + 1, ctx );
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	out->bv_len = len;

	/* Fill in URI with replace string, replacing $i as we go */
	n=1;
	insert = 0;
	while( off[n] >= 0) {
		/* Paste in next section from replacement string (x,y,z above) */
		len = off[n] - off[n-1] - 2;
		strncpy( out->bv_val+insert, rep + off[n-1] + 2, len);
		insert += len;
		if( off[n+1] < 0)
			break;

		/* Paste in string from saslname that matched next $i  (b,d above) */
		i = rep[ off[n] + 1 ]	- '0';
		len = str[i].rm_eo - str[i].rm_so;
		strncpy( out->bv_val+insert, saslname + str[i].rm_so, len );
		insert += len;

		n++;
	}

	out->bv_val[insert] = '\0';
}