1 files changed, 363 insertions, 0 deletions
diff --git a/servers/slapd/referral.c b/servers/slapd/referral.c
new file mode 100644
index 0000000..50da23a
--- /dev/null
+++ b/servers/slapd/referral.c
@@ -0,0 +1,363 @@
+/* referral.c - muck with referrals */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2021 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/socket.h>
+#include <ac/errno.h>
+#include <ac/string.h>
+#include <ac/ctype.h>
+#include <ac/time.h>
+#include <ac/unistd.h>
+
+#include "slap.h"
+
+/*
+ * This routine generates the DN appropriate to return in
+ * an LDAP referral.
+ */
+static char * referral_dn_muck(
+	const char * refDN,
+	struct berval * baseDN,
+	struct berval * targetDN )
+{
+	int rc;
+	struct berval bvin;
+	struct berval nrefDN = BER_BVNULL;
+	struct berval nbaseDN = BER_BVNULL;
+	struct berval ntargetDN = BER_BVNULL;
+
+	if( !baseDN ) {
+		/* no base, return target */
+		return targetDN ? ch_strdup( targetDN->bv_val ) : NULL;
+	}
+
+	if( refDN ) {
+		bvin.bv_val = (char *)refDN;
+		bvin.bv_len = strlen( refDN );
+
+		rc = dnPretty( NULL, &bvin, &nrefDN, NULL );
+		if( rc != LDAP_SUCCESS ) {
+			/* Invalid refDN */
+			return NULL;
+		}
+	}
+
+	if( !targetDN ) {
+		/* continuation reference
+		 *	if refDN present return refDN
+		 *  else return baseDN
+		 */
+		return nrefDN.bv_len ? nrefDN.bv_val : ch_strdup( baseDN->bv_val );
+	}
+
+	rc = dnPretty( NULL, targetDN, &ntargetDN, NULL );
+	if( rc != LDAP_SUCCESS ) {
+		/* Invalid targetDN */
+		ch_free( nrefDN.bv_val );
+		return NULL;
+	}
+
+	if( nrefDN.bv_len ) {
+		rc = dnPretty( NULL, baseDN, &nbaseDN, NULL );
+		if( rc != LDAP_SUCCESS ) {
+			/* Invalid baseDN */
+			ch_free( nrefDN.bv_val );
+			ch_free( ntargetDN.bv_val );
+			return NULL;
+		}
+
+		if( dn_match( &nbaseDN, &nrefDN ) ) {
+			ch_free( nrefDN.bv_val );
+			ch_free( nbaseDN.bv_val );
+			return ntargetDN.bv_val;
+		}
+
+		{
+			struct berval muck;
+
+			if( ntargetDN.bv_len < nbaseDN.bv_len ) {
+				ch_free( nrefDN.bv_val );
+				ch_free( nbaseDN.bv_val );
+				return ntargetDN.bv_val;
+			}
+
+			rc = strcasecmp(
+				&ntargetDN.bv_val[ntargetDN.bv_len-nbaseDN.bv_len],
+				nbaseDN.bv_val );
+			if( rc ) {
+				/* target not subordinate to base */
+				ch_free( nrefDN.bv_val );
+				ch_free( nbaseDN.bv_val );
+				return ntargetDN.bv_val;
+			}
+
+			muck.bv_len = ntargetDN.bv_len + nrefDN.bv_len - nbaseDN.bv_len;
+			muck.bv_val = ch_malloc( muck.bv_len + 1 );
+
+			strncpy( muck.bv_val, ntargetDN.bv_val,
+				ntargetDN.bv_len-nbaseDN.bv_len );
+			strcpy( &muck.bv_val[ntargetDN.bv_len-nbaseDN.bv_len],
+				nrefDN.bv_val );
+
+			ch_free( nrefDN.bv_val );
+			ch_free( nbaseDN.bv_val );
+			ch_free( ntargetDN.bv_val );
+
+			return muck.bv_val;
+		}
+	}
+
+	ch_free( nrefDN.bv_val );
+	return ntargetDN.bv_val;
+}
+
+
+/* validate URL for global referral use
+ *   LDAP URLs must not have:
+ *     DN, attrs, scope, nor filter
+ *   Any non-LDAP URL is okay
+ *
+ *   XXYYZ: should return an error string
+ */
+int validate_global_referral( const char *url )
+{
+	int rc;
+	LDAPURLDesc *lurl;
+
+	rc = ldap_url_parse_ext( url, &lurl, LDAP_PVT_URL_PARSE_NONE );
+
+	switch( rc ) {
+	case LDAP_URL_SUCCESS:
+		break;
+
+	case LDAP_URL_ERR_BADSCHEME:
+		/* not LDAP hence valid */
+		Debug( LDAP_DEBUG_CONFIG, "referral \"%s\": not LDAP.\n", url, 0, 0 );
+		return 0;
+
+	default:
+		/* other error, bail */
+		Debug( LDAP_DEBUG_ANY,
+			"referral: invalid URL (%s): %s (%d)\n",
+			url, "" /* ldap_url_error2str(rc) */, rc );
+		return 1;
+	}
+
+	rc = 0;
+
+	if( lurl->lud_dn && *lurl->lud_dn ) {
+		Debug( LDAP_DEBUG_ANY,
+			"referral: URL (%s): contains DN\n",
+			url, 0, 0 );
+		rc = 1;
+
+	} else if( lurl->lud_attrs ) {
+		Debug( LDAP_DEBUG_ANY,
+			"referral: URL (%s): requests attributes\n",
+			url, 0, 0 );
+		rc = 1;
+
+	} else if( lurl->lud_scope != LDAP_SCOPE_DEFAULT ) {
+		Debug( LDAP_DEBUG_ANY,
+			"referral: URL (%s): contains explicit scope\n",
+			url, 0, 0 );
+		rc = 1;
+
+	} else if( lurl->lud_filter ) {
+		Debug( LDAP_DEBUG_ANY,
+			"referral: URL (%s): contains explicit filter\n",
+			url, 0, 0 );
+		rc = 1;
+	}
+
+	ldap_free_urldesc( lurl );
+	return rc;
+}
+
+BerVarray referral_rewrite(
+	BerVarray in,
+	struct berval *base,
+	struct berval *target,
+	int scope )
+{
+	int		i;
+	BerVarray	refs;
+	struct berval	*iv, *jv;
+
+	if ( in == NULL ) {
+		return NULL;
+	}
+
+	for ( i = 0; !BER_BVISNULL( &in[i] ); i++ ) {
+		/* just count them */
+	}
+
+	if ( i < 1 ) {
+		return NULL;
+	}
+
+	refs = ch_malloc( ( i + 1 ) * sizeof( struct berval ) );
+
+	for ( iv = in, jv = refs; !BER_BVISNULL( iv ); iv++ ) {
+		LDAPURLDesc	*url;
+		char		*dn;
+		int		rc;
+		
+		rc = ldap_url_parse_ext( iv->bv_val, &url, LDAP_PVT_URL_PARSE_NONE );
+		if ( rc == LDAP_URL_ERR_BADSCHEME ) {
+			ber_dupbv( jv++, iv );
+			continue;
+
+		} else if ( rc != LDAP_URL_SUCCESS ) {
+			continue;
+		}
+
+		dn = url->lud_dn;
+		url->lud_dn = referral_dn_muck( ( dn && *dn ) ? dn : NULL,
+				base, target );
+		ldap_memfree( dn );
+
+		if ( url->lud_scope == LDAP_SCOPE_DEFAULT ) {
+			url->lud_scope = scope;
+		}
+
+		jv->bv_val = ldap_url_desc2str( url );
+		if ( jv->bv_val != NULL ) {
+			jv->bv_len = strlen( jv->bv_val );
+
+		} else {
+			ber_dupbv( jv, iv );
+		}
+		jv++;
+
+		ldap_free_urldesc( url );
+	}
+
+	if ( jv == refs ) {
+		ch_free( refs );
+		refs = NULL;
+
+	} else {
+		BER_BVZERO( jv );
+	}
+
+	return refs;
+}
+
+
+BerVarray get_entry_referrals(
+	Operation *op,
+	Entry *e )
+{
+	Attribute *attr;
+	BerVarray refs;
+	unsigned i;
+	struct berval *iv, *jv;
+
+	AttributeDescription *ad_ref = slap_schema.si_ad_ref;
+
+	attr = attr_find( e->e_attrs, ad_ref );
+
+	if( attr == NULL ) return NULL;
+
+	for( i=0; attr->a_vals[i].bv_val != NULL; i++ ) {
+		/* count references */
+	}
+
+	if( i < 1 ) return NULL;
+
+	refs = ch_malloc( (i + 1) * sizeof(struct berval));
+
+	for( iv=attr->a_vals, jv=refs; iv->bv_val != NULL; iv++ ) {
+		unsigned k;
+		ber_dupbv( jv, iv );
+
+		/* trim the label */
+		for( k=0; k<jv->bv_len; k++ ) {
+			if( isspace( (unsigned char) jv->bv_val[k] ) ) {
+				jv->bv_val[k] = '\0';
+				jv->bv_len = k;
+				break;
+			}
+		}
+
+		if(	jv->bv_len > 0 ) {
+			jv++;
+		} else {
+			free( jv->bv_val );
+		}
+	}
+
+	if( jv == refs ) {
+		free( refs );
+		refs = NULL;
+
+	} else {
+		jv->bv_val = NULL;
+	}
+
+	/* we should check that a referral value exists... */
+	return refs;
+}
+
+
+int get_alias_dn(
+	Entry *e,
+	struct berval *ndn,
+	int *err,
+	const char **text )
+{	
+	Attribute *a;
+	AttributeDescription *aliasedObjectName
+		= slap_schema.si_ad_aliasedObjectName;
+
+	a = attr_find( e->e_attrs, aliasedObjectName );
+
+	if( a == NULL ) {
+		/*
+		 * there was an aliasedobjectname defined but no data.
+		 */
+		*err = LDAP_ALIAS_PROBLEM;
+		*text = "alias missing aliasedObjectName attribute";
+		return -1;
+	}
+
+	/* 
+	 * aliasedObjectName should be SINGLE-VALUED with a single value. 
+	 */			
+	if ( a->a_vals[0].bv_val == NULL ) {
+		/*
+		 * there was an aliasedobjectname defined but no data.
+		 */
+		*err = LDAP_ALIAS_PROBLEM;
+		*text = "alias missing aliasedObjectName value";
+		return -1;
+	}
+
+	if( a->a_nvals[1].bv_val != NULL ) {
+		*err = LDAP_ALIAS_PROBLEM;
+		*text = "alias has multivalued aliasedObjectName";
+		return -1;
+	}
+
+	*ndn = a->a_nvals[0];
+
+	return 0;
+}
+