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-rw-r--r--servers/slapd/back-relay/op.c333
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diff --git a/servers/slapd/back-relay/op.c b/servers/slapd/back-relay/op.c
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+/* op.c - relay backend operations */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2004-2022 The OpenLDAP Foundation.
+ * Portions Copyright 2004 Pierangelo Masarati.
+ * 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>.
+ */
+/* ACKNOWLEDGEMENTS:
+ * This work was initially developed by Pierangelo Masarati for inclusion
+ * in OpenLDAP Software.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include "slap.h"
+#include "back-relay.h"
+
+/* Results when no real database (.rf_bd) or operation handler (.rf_op) */
+static const struct relay_fail_modes_s {
+ slap_mask_t rf_bd, rf_op;
+#define RB_ERR_MASK 0x0000FFFFU /* bitmask for default return value */
+#define RB_BDERR 0x80000000U /* use .rf_bd's default return value */
+#define RB_OPERR 0x40000000U /* set rs->sr_err = .rf_op return value */
+#define RB_REF 0x20000000U /* use default_referral if available */
+#define RB_SEND 0x10000000U /* send result; RB_??ERR is also set */
+#define RB_SENDREF 0/*unused*/ /* like RB_SEND when referral found */
+#define RB_NO_BIND (RB_OPERR | LDAP_INVALID_CREDENTIALS)
+#define RB_NOT_SUPP (RB_OPERR | LDAP_UNWILLING_TO_PERFORM)
+#define RB_NO_OBJ (RB_REF | LDAP_NO_SUCH_OBJECT)
+#define RB_CHK_REF (RB_REF | RB_SENDREF | LDAP_SUCCESS)
+} relay_fail_modes[relay_op_last] = {
+ /* .rf_bd is unused when zero, otherwise both fields have RB_BDERR */
+# define RB_OP(b, o) { (b) | RB_BD2ERR(b), (o) | RB_BD2ERR(b) }
+# define RB_BD2ERR(b) ((b) ? RB_BDERR : 0)
+ /* indexed by slap_operation_t: */
+ RB_OP(RB_NO_BIND|RB_SEND, RB_NO_BIND |RB_SEND), /* Bind */
+ RB_OP(0, LDAP_SUCCESS), /* Unbind: unused */
+ RB_OP(RB_NO_OBJ |RB_SEND, RB_NOT_SUPP |RB_SEND), /* Search */
+ RB_OP(RB_NO_OBJ |RB_SEND, SLAP_CB_CONTINUE), /* Compare */
+ RB_OP(RB_NO_OBJ |RB_SEND, RB_NOT_SUPP |RB_SEND), /* Modify */
+ RB_OP(RB_NO_OBJ |RB_SEND, RB_NOT_SUPP |RB_SEND), /* Modrdn */
+ RB_OP(RB_NO_OBJ |RB_SEND, RB_NOT_SUPP |RB_SEND), /* Add */
+ RB_OP(RB_NO_OBJ |RB_SEND, RB_NOT_SUPP |RB_SEND), /* Delete */
+ RB_OP(0, LDAP_SUCCESS), /* Abandon:unused */
+ RB_OP(RB_NO_OBJ, RB_NOT_SUPP), /* Extended */
+ RB_OP(0, SLAP_CB_CONTINUE), /* Cancel: unused */
+ RB_OP(0, LDAP_SUCCESS), /* operational */
+ RB_OP(RB_CHK_REF, LDAP_SUCCESS), /* chk_referrals:unused*/
+ RB_OP(0, SLAP_CB_CONTINUE),/* chk_controls:unused */
+ /* additional relay_operation_t indexes from back-relay.h: */
+ RB_OP(0, 0/*unused*/), /* entry_get = op_last */
+ RB_OP(0, 0/*unused*/), /* entry_release */
+ RB_OP(0, 0/*unused*/), /* has_subordinates */
+};
+
+/*
+ * Callbacks: Caller changed op->o_bd from Relay to underlying
+ * BackendDB. sc_response sets it to Relay BackendDB, sc_cleanup puts
+ * back underlying BackendDB. Caller will restore Relay BackendDB.
+ */
+
+typedef struct relay_callback {
+ slap_callback rcb_sc;
+ BackendDB *rcb_bd;
+} relay_callback;
+
+static int
+relay_back_cleanup_cb( Operation *op, SlapReply *rs )
+{
+ op->o_bd = ((relay_callback *) op->o_callback)->rcb_bd;
+ return SLAP_CB_CONTINUE;
+}
+
+static int
+relay_back_response_cb( Operation *op, SlapReply *rs )
+{
+ relay_callback *rcb = (relay_callback *) op->o_callback;
+
+ rcb->rcb_sc.sc_cleanup = relay_back_cleanup_cb;
+ rcb->rcb_bd = op->o_bd;
+ op->o_bd = op->o_callback->sc_private;
+ return SLAP_CB_CONTINUE;
+}
+
+#define relay_back_add_cb( rcb, op ) { \
+ (rcb)->rcb_sc.sc_next = (op)->o_callback; \
+ (rcb)->rcb_sc.sc_response = relay_back_response_cb; \
+ (rcb)->rcb_sc.sc_cleanup = 0; \
+ (rcb)->rcb_sc.sc_writewait = 0; \
+ (rcb)->rcb_sc.sc_private = (op)->o_bd; \
+ (op)->o_callback = (slap_callback *) (rcb); \
+}
+
+#define relay_back_remove_cb( rcb, op ) { \
+ slap_callback **sc = &(op)->o_callback; \
+ for ( ;; sc = &(*sc)->sc_next ) \
+ if ( *sc == (slap_callback *) (rcb) ) { \
+ *sc = (*sc)->sc_next; break; \
+ } else if ( *sc == NULL ) break; \
+}
+
+/*
+ * Select the backend database with the operation's DN. On failure,
+ * set/send results depending on operation type <which>'s fail_modes.
+ */
+static BackendDB *
+relay_back_select_backend( Operation *op, SlapReply *rs, int which )
+{
+ OpExtra *oex;
+ char *key = (char *) op->o_bd->be_private;
+ BackendDB *bd = ((relay_back_info *) key)->ri_bd;
+ slap_mask_t fail_mode = relay_fail_modes[which].rf_bd;
+ int useDN = 0, rc = ( fail_mode & RB_ERR_MASK );
+
+ if ( bd == NULL && !BER_BVISNULL( &op->o_req_ndn ) ) {
+ useDN = 1;
+ bd = select_backend( &op->o_req_ndn, 1 );
+ }
+
+ if ( bd != NULL ) {
+ key += which; /* <relay, op type> key from RELAY_WRAP_OP() */
+ LDAP_SLIST_FOREACH( oex, &op->o_extra, oe_next ) {
+ if ( oex->oe_key == key )
+ break;
+ }
+ if ( oex == NULL ) {
+ return bd;
+ }
+
+ Debug( LDAP_DEBUG_ANY,
+ "%s: back-relay for DN=\"%s\" would call self.\n",
+ op->o_log_prefix, op->o_req_dn.bv_val );
+
+ } else if ( useDN && ( fail_mode & RB_REF ) && default_referral ) {
+ rc = LDAP_REFERRAL;
+
+ /* if we set sr_err to LDAP_REFERRAL, we must provide one */
+ rs->sr_ref = referral_rewrite(
+ default_referral, NULL, &op->o_req_dn,
+ op->o_tag == LDAP_REQ_SEARCH ?
+ op->ors_scope : LDAP_SCOPE_DEFAULT );
+ if ( rs->sr_ref != NULL ) {
+ rs->sr_flags |= REP_REF_MUSTBEFREED;
+ } else {
+ rs->sr_ref = default_referral;
+ }
+
+ if ( fail_mode & RB_SENDREF )
+ fail_mode = (RB_BDERR | RB_SEND);
+ }
+
+ if ( fail_mode & RB_BDERR ) {
+ rs->sr_err = rc;
+ if ( fail_mode & RB_SEND ) {
+ send_ldap_result( op, rs );
+ }
+ }
+
+ return NULL;
+}
+
+/*
+ * Forward <act> on <op> to database <bd>, with <relay, op type>-specific
+ * key in op->o_extra so relay_back_select_backend() can catch recursion.
+ */
+#define RELAY_WRAP_OP( op, bd, which, act ) { \
+ OpExtraDB wrap_oex; \
+ BackendDB *const wrap_bd = (op)->o_bd; \
+ wrap_oex.oe_db = wrap_bd; \
+ wrap_oex.oe.oe_key = (char *) wrap_bd->be_private + (which); \
+ LDAP_SLIST_INSERT_HEAD( &(op)->o_extra, &wrap_oex.oe, oe_next ); \
+ (op)->o_bd = (bd); \
+ act; \
+ (op)->o_bd = wrap_bd; \
+ LDAP_SLIST_REMOVE( &(op)->o_extra, &wrap_oex.oe, OpExtra, oe_next ); \
+}
+
+/*
+ * Forward backend function #<which> on <op> to operation DN's database
+ * like RELAY_WRAP_OP, after setting up callbacks. If no database or no
+ * backend function, set/send results depending on <which>'s fail_modes.
+ */
+static int
+relay_back_op( Operation *op, SlapReply *rs, int which )
+{
+ BackendDB *bd;
+ BackendInfo *bi;
+ slap_mask_t fail_mode = relay_fail_modes[which].rf_op;
+ int rc = ( fail_mode & RB_ERR_MASK );
+
+ bd = relay_back_select_backend( op, rs, which );
+ if ( bd == NULL ) {
+ if ( fail_mode & RB_BDERR )
+ return rs->sr_err; /* sr_err was set above */
+
+ } else if ( (&( bi = bd->bd_info )->bi_op_bind)[which] ) {
+ relay_callback rcb;
+
+ relay_back_add_cb( &rcb, op );
+ RELAY_WRAP_OP( op, bd, which, {
+ rc = (&bi->bi_op_bind)[which]( op, rs );
+ });
+ relay_back_remove_cb( &rcb, op );
+ if ( which == op_bind && rc == LDAP_SUCCESS )
+ op->o_bd = bd;
+
+ } else if ( fail_mode & RB_OPERR ) {
+ rs->sr_err = rc;
+ if ( rc == LDAP_UNWILLING_TO_PERFORM ) {
+ rs->sr_text = "operation not supported within naming context";
+ }
+
+ if ( fail_mode & RB_SEND ) {
+ send_ldap_result( op, rs );
+ }
+ }
+
+ return rc;
+}
+
+
+int
+relay_back_op_bind( Operation *op, SlapReply *rs )
+{
+ /* allow rootdn as a means to auth without the need to actually
+ * contact the proxied DSA */
+ switch ( be_rootdn_bind( op, rs ) ) {
+ case SLAP_CB_CONTINUE:
+ break;
+
+ default:
+ return rs->sr_err;
+ }
+
+ return relay_back_op( op, rs, op_bind );
+}
+
+#define RELAY_DEFOP(func, which) \
+ int func( Operation *op, SlapReply *rs ) \
+ { return relay_back_op( op, rs, which ); }
+
+RELAY_DEFOP( relay_back_op_search, op_search )
+RELAY_DEFOP( relay_back_op_compare, op_compare )
+RELAY_DEFOP( relay_back_op_modify, op_modify )
+RELAY_DEFOP( relay_back_op_modrdn, op_modrdn )
+RELAY_DEFOP( relay_back_op_add, op_add )
+RELAY_DEFOP( relay_back_op_delete, op_delete )
+RELAY_DEFOP( relay_back_op_extended, op_extended )
+RELAY_DEFOP( relay_back_operational, op_aux_operational )
+
+/* Abandon, Cancel, Unbind and some DN-less calls like be_connection_init
+ * need no extra handling: slapd already calls them for all databases.
+ */
+
+
+int
+relay_back_entry_release_rw( Operation *op, Entry *e, int rw )
+{
+ BackendDB *bd;
+ int rc = LDAP_UNWILLING_TO_PERFORM;
+
+ bd = relay_back_select_backend( op, NULL, relay_op_entry_release );
+ if ( bd && bd->be_release ) {
+ RELAY_WRAP_OP( op, bd, relay_op_entry_release, {
+ rc = bd->be_release( op, e, rw );
+ });
+ } else if ( e->e_private == NULL ) {
+ entry_free( e );
+ rc = LDAP_SUCCESS;
+ }
+
+ return rc;
+}
+
+int
+relay_back_entry_get_rw( Operation *op, struct berval *ndn,
+ ObjectClass *oc, AttributeDescription *at, int rw, Entry **e )
+{
+ BackendDB *bd;
+ int rc = LDAP_NO_SUCH_OBJECT;
+
+ bd = relay_back_select_backend( op, NULL, relay_op_entry_get );
+ if ( bd && bd->be_fetch ) {
+ RELAY_WRAP_OP( op, bd, relay_op_entry_get, {
+ rc = bd->be_fetch( op, ndn, oc, at, rw, e );
+ });
+ }
+
+ return rc;
+}
+
+#if 0 /* Give the RB_SENDREF flag a nonzero value if implementing this */
+/*
+ * NOTE: even the existence of this function is questionable: we cannot
+ * pass the bi_chk_referrals() call thru the rwm overlay because there
+ * is no way to rewrite the req_dn back; but then relay_back_chk_referrals()
+ * is passing the target database a DN that likely does not belong to its
+ * naming context... mmmh.
+ */
+RELAY_DEFOP( relay_back_chk_referrals, op_aux_chk_referrals )
+#endif /*0*/
+
+int
+relay_back_has_subordinates( Operation *op, Entry *e, int *hasSubs )
+{
+ BackendDB *bd;
+ int rc = LDAP_OTHER;
+
+ bd = relay_back_select_backend( op, NULL, relay_op_has_subordinates );
+ if ( bd && bd->be_has_subordinates ) {
+ RELAY_WRAP_OP( op, bd, relay_op_has_subordinates, {
+ rc = bd->be_has_subordinates( op, e, hasSubs );
+ });
+ }
+
+ return rc;
+}
+
+
+/*
+ * FIXME: must implement tools as well
+ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-08 11:11:22 +0000