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-rw-r--r--servers/slapd/back-ldap/chain.c2358
1 files changed, 2358 insertions, 0 deletions
diff --git a/servers/slapd/back-ldap/chain.c b/servers/slapd/back-ldap/chain.c
new file mode 100644
index 0000000..f1b3af6
--- /dev/null
+++ b/servers/slapd/back-ldap/chain.c
@@ -0,0 +1,2358 @@
+/* chain.c - chain LDAP operations */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2003-2021 The OpenLDAP Foundation.
+ * Portions Copyright 2003 Howard Chu.
+ * 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 the Howard Chu for inclusion
+ * in OpenLDAP Software.
+ * This work was subsequently modified by Pierangelo Masarati.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/string.h>
+#include <ac/socket.h>
+
+#include "lutil.h"
+#include "slap.h"
+#include "back-ldap.h"
+#include "config.h"
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+#define SLAP_CHAINING_DEFAULT LDAP_CHAINING_PREFERRED
+#define SLAP_CH_RESOLVE_SHIFT SLAP_CONTROL_SHIFT
+#define SLAP_CH_RESOLVE_MASK (0x3 << SLAP_CH_RESOLVE_SHIFT)
+#define SLAP_CH_RESOLVE_CHAINING_PREFERRED (LDAP_CHAINING_PREFERRED << SLAP_CH_RESOLVE_SHIFT)
+#define SLAP_CH_RESOLVE_CHAINING_REQUIRED (LDAP_CHAINING_REQUIRED << SLAP_CH_RESOLVE_SHIFT)
+#define SLAP_CH_RESOLVE_REFERRALS_PREFERRED (LDAP_REFERRALS_PREFERRED << SLAP_CH_RESOLVE_SHIFT)
+#define SLAP_CH_RESOLVE_REFERRALS_REQUIRED (LDAP_REFERRALS_REQUIRED << SLAP_CH_RESOLVE_SHIFT)
+#define SLAP_CH_RESOLVE_DEFAULT (SLAP_CHAINING_DEFAULT << SLAP_CH_RESOLVE_SHIFT)
+#define SLAP_CH_CONTINUATION_SHIFT (SLAP_CH_RESOLVE_SHIFT + 2)
+#define SLAP_CH_CONTINUATION_MASK (0x3 << SLAP_CH_CONTINUATION_SHIFT)
+#define SLAP_CH_CONTINUATION_CHAINING_PREFERRED (LDAP_CHAINING_PREFERRED << SLAP_CH_CONTINUATION_SHIFT)
+#define SLAP_CH_CONTINUATION_CHAINING_REQUIRED (LDAP_CHAINING_REQUIRED << SLAP_CH_CONTINUATION_SHIFT)
+#define SLAP_CH_CONTINUATION_REFERRALS_PREFERRED (LDAP_REFERRALS_PREFERRED << SLAP_CH_CONTINUATION_SHIFT)
+#define SLAP_CH_CONTINUATION_REFERRALS_REQUIRED (LDAP_REFERRALS_REQUIRED << SLAP_CH_CONTINUATION_SHIFT)
+#define SLAP_CH_CONTINUATION_DEFAULT (SLAP_CHAINING_DEFAULT << SLAP_CH_CONTINUATION_SHIFT)
+
+#define o_chaining o_ctrlflag[sc_chainingBehavior]
+#define get_chaining(op) ((op)->o_chaining & SLAP_CONTROL_MASK)
+#define get_chainingBehavior(op) ((op)->o_chaining & (SLAP_CH_RESOLVE_MASK|SLAP_CH_CONTINUATION_MASK))
+#define get_resolveBehavior(op) ((op)->o_chaining & SLAP_CH_RESOLVE_MASK)
+#define get_continuationBehavior(op) ((op)->o_chaining & SLAP_CH_CONTINUATION_MASK)
+
+static int sc_chainingBehavior;
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+
+typedef enum {
+ LDAP_CH_NONE = 0,
+ LDAP_CH_RES,
+ LDAP_CH_ERR
+} ldap_chain_status_t;
+
+static BackendInfo *lback;
+
+typedef struct ldap_chain_t {
+ /*
+ * A "template" ldapinfo_t gets all common configuration items;
+ * then, for each configured URI, an entry is created in the tree;
+ * all the specific configuration items get in the current URI
+ * structure.
+ *
+ * Then, for each referral, extract the URI and lookup the
+ * related structure. If configured to do so, allow URIs
+ * not found in the structure to create a temporary one
+ * that chains anonymously; maybe it can also be added to
+ * the tree? Should be all configurable.
+ */
+
+ /* "common" configuration info (anything occurring before an "uri") */
+ ldapinfo_t *lc_common_li;
+
+ /* current configuration info */
+ ldapinfo_t *lc_cfg_li;
+
+ /* tree of configured[/generated?] "uri" info */
+ ldap_avl_info_t lc_lai;
+
+ /* max depth in nested referrals chaining */
+ int lc_max_depth;
+
+ unsigned lc_flags;
+#define LDAP_CHAIN_F_NONE (0x00U)
+#define LDAP_CHAIN_F_CHAINING (0x01U)
+#define LDAP_CHAIN_F_CACHE_URI (0x02U)
+#define LDAP_CHAIN_F_RETURN_ERR (0x04U)
+
+#define LDAP_CHAIN_ISSET(lc, f) ( ( (lc)->lc_flags & (f) ) == (f) )
+#define LDAP_CHAIN_CHAINING( lc ) LDAP_CHAIN_ISSET( (lc), LDAP_CHAIN_F_CHAINING )
+#define LDAP_CHAIN_CACHE_URI( lc ) LDAP_CHAIN_ISSET( (lc), LDAP_CHAIN_F_CACHE_URI )
+#define LDAP_CHAIN_RETURN_ERR( lc ) LDAP_CHAIN_ISSET( (lc), LDAP_CHAIN_F_RETURN_ERR )
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ LDAPControl lc_chaining_ctrl;
+ char lc_chaining_ctrlflag;
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+} ldap_chain_t;
+
+static int ldap_chain_db_init_common( BackendDB *be );
+static int ldap_chain_db_init_one( BackendDB *be );
+static int ldap_chain_db_open_one( BackendDB *be );
+#define ldap_chain_db_close_one(be) (0)
+#define ldap_chain_db_destroy_one(be, rs) (lback)->bi_db_destroy( (be), (rs) )
+
+typedef struct ldap_chain_cb_t {
+ ldap_chain_status_t lb_status;
+ ldap_chain_t *lb_lc;
+ BI_op_func *lb_op_f;
+ int lb_depth;
+} ldap_chain_cb_t;
+
+static int
+ldap_chain_op(
+ Operation *op,
+ SlapReply *rs,
+ BI_op_func *op_f,
+ BerVarray ref,
+ int depth );
+
+static int
+ldap_chain_search(
+ Operation *op,
+ SlapReply *rs,
+ BerVarray ref,
+ int depth );
+
+static slap_overinst ldapchain;
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+static int
+chaining_control_add(
+ ldap_chain_t *lc,
+ Operation *op,
+ LDAPControl ***oldctrlsp )
+{
+ LDAPControl **ctrls = NULL;
+ int c = 0;
+
+ *oldctrlsp = op->o_ctrls;
+
+ /* default chaining control not defined */
+ if ( !LDAP_CHAIN_CHAINING( lc ) ) {
+ return 0;
+ }
+
+ /* already present */
+ if ( get_chaining( op ) > SLAP_CONTROL_IGNORED ) {
+ return 0;
+ }
+
+ /* FIXME: check other incompatibilities */
+
+ /* add to other controls */
+ if ( op->o_ctrls ) {
+ for ( c = 0; op->o_ctrls[ c ]; c++ )
+ /* count them */ ;
+ }
+
+ ctrls = ch_calloc( sizeof( LDAPControl *), c + 2 );
+ ctrls[ 0 ] = &lc->lc_chaining_ctrl;
+ if ( op->o_ctrls ) {
+ for ( c = 0; op->o_ctrls[ c ]; c++ ) {
+ ctrls[ c + 1 ] = op->o_ctrls[ c ];
+ }
+ }
+ ctrls[ c + 1 ] = NULL;
+
+ op->o_ctrls = ctrls;
+
+ op->o_chaining = lc->lc_chaining_ctrlflag;
+
+ return 0;
+}
+
+static int
+chaining_control_remove(
+ Operation *op,
+ LDAPControl ***oldctrlsp )
+{
+ LDAPControl **oldctrls = *oldctrlsp;
+
+ /* we assume that the first control is the chaining control
+ * added by the chain overlay, so it's the only one we explicitly
+ * free */
+ if ( op->o_ctrls != oldctrls ) {
+ if ( op->o_ctrls != NULL ) {
+ assert( op->o_ctrls[ 0 ] != NULL );
+
+ free( op->o_ctrls );
+
+ op->o_chaining = 0;
+ }
+ op->o_ctrls = oldctrls;
+ }
+
+ *oldctrlsp = NULL;
+
+ return 0;
+}
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+
+static int
+ldap_chain_uri_cmp( const void *c1, const void *c2 )
+{
+ const ldapinfo_t *li1 = (const ldapinfo_t *)c1;
+ const ldapinfo_t *li2 = (const ldapinfo_t *)c2;
+
+ assert( li1->li_bvuri != NULL );
+ assert( !BER_BVISNULL( &li1->li_bvuri[ 0 ] ) );
+ assert( BER_BVISNULL( &li1->li_bvuri[ 1 ] ) );
+
+ assert( li2->li_bvuri != NULL );
+ assert( !BER_BVISNULL( &li2->li_bvuri[ 0 ] ) );
+ assert( BER_BVISNULL( &li2->li_bvuri[ 1 ] ) );
+
+ return ber_bvcmp( &li1->li_bvuri[ 0 ], &li2->li_bvuri[ 0 ] );
+}
+
+static int
+ldap_chain_uri_dup( void *c1, void *c2 )
+{
+ ldapinfo_t *li1 = (ldapinfo_t *)c1;
+ ldapinfo_t *li2 = (ldapinfo_t *)c2;
+
+ assert( li1->li_bvuri != NULL );
+ assert( !BER_BVISNULL( &li1->li_bvuri[ 0 ] ) );
+ assert( BER_BVISNULL( &li1->li_bvuri[ 1 ] ) );
+
+ assert( li2->li_bvuri != NULL );
+ assert( !BER_BVISNULL( &li2->li_bvuri[ 0 ] ) );
+ assert( BER_BVISNULL( &li2->li_bvuri[ 1 ] ) );
+
+ if ( ber_bvcmp( &li1->li_bvuri[ 0 ], &li2->li_bvuri[ 0 ] ) == 0 ) {
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * Search specific response that strips entryDN from entries
+ */
+static int
+ldap_chain_cb_search_response( Operation *op, SlapReply *rs )
+{
+ ldap_chain_cb_t *lb = (ldap_chain_cb_t *)op->o_callback->sc_private;
+
+ assert( op->o_tag == LDAP_REQ_SEARCH );
+
+ /* if in error, don't proceed any further */
+ if ( lb->lb_status == LDAP_CH_ERR ) {
+ return 0;
+ }
+
+ if ( rs->sr_type == REP_SEARCH ) {
+ Attribute **ap = &rs->sr_entry->e_attrs;
+
+ for ( ; *ap != NULL; ap = &(*ap)->a_next ) {
+ /* will be generated later by frontend
+ * (a cleaner solution would be that
+ * the frontend checks if it already exists */
+ if ( ad_cmp( (*ap)->a_desc, slap_schema.si_ad_entryDN ) == 0 )
+ {
+ Attribute *a = *ap;
+
+ *ap = (*ap)->a_next;
+ attr_free( a );
+
+ /* there SHOULD be one only! */
+ break;
+ }
+ }
+
+ /* tell the frontend not to add generated
+ * operational attributes */
+ rs->sr_flags |= REP_NO_OPERATIONALS;
+
+ return SLAP_CB_CONTINUE;
+
+ } else if ( rs->sr_type == REP_SEARCHREF ) {
+ /* if we get it here, it means the library was unable
+ * to chase the referral... */
+ if ( lb->lb_depth < lb->lb_lc->lc_max_depth && rs->sr_ref != NULL ) {
+ rs->sr_err = ldap_chain_search( op, rs, rs->sr_ref, lb->lb_depth );
+ }
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ if ( rs->sr_err == LDAP_REFERRAL && get_chaining( op ) > SLAP_CONTROL_IGNORED ) {
+ switch ( get_continuationBehavior( op ) ) {
+ case SLAP_CH_RESOLVE_CHAINING_REQUIRED:
+ lb->lb_status = LDAP_CH_ERR;
+ return rs->sr_err = LDAP_X_CANNOT_CHAIN;
+
+ default:
+ break;
+ }
+ }
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+ return SLAP_CB_CONTINUE;
+
+ } else if ( rs->sr_type == REP_RESULT ) {
+ if ( rs->sr_err == LDAP_REFERRAL
+ && lb->lb_depth < lb->lb_lc->lc_max_depth
+ && rs->sr_ref != NULL )
+ {
+ rs->sr_err = ldap_chain_op( op, rs, lb->lb_op_f, rs->sr_ref, lb->lb_depth );
+ }
+
+ /* back-ldap tried to send result */
+ lb->lb_status = LDAP_CH_RES;
+ /* don't let other callbacks run, this isn't
+ * the real result for this op.
+ */
+ op->o_callback->sc_next = NULL;
+ }
+
+ return 0;
+}
+
+/*
+ * Dummy response that simply traces if back-ldap tried to send
+ * anything to the client
+ */
+static int
+ldap_chain_cb_response( Operation *op, SlapReply *rs )
+{
+ ldap_chain_cb_t *lb = (ldap_chain_cb_t *)op->o_callback->sc_private;
+
+ /* if in error, don't proceed any further */
+ if ( lb->lb_status == LDAP_CH_ERR ) {
+ return 0;
+ }
+
+ if ( rs->sr_type == REP_RESULT ) {
+retry:;
+ switch ( rs->sr_err ) {
+ case LDAP_COMPARE_TRUE:
+ case LDAP_COMPARE_FALSE:
+ if ( op->o_tag != LDAP_REQ_COMPARE ) {
+ return rs->sr_err;
+ }
+ /* fallthru */
+
+ case LDAP_SUCCESS:
+ lb->lb_status = LDAP_CH_RES;
+ break;
+
+ case LDAP_REFERRAL:
+ if ( lb->lb_depth < lb->lb_lc->lc_max_depth && rs->sr_ref != NULL ) {
+ rs->sr_err = ldap_chain_op( op, rs, lb->lb_op_f, rs->sr_ref, lb->lb_depth );
+ goto retry;
+ }
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ if ( get_chaining( op ) > SLAP_CONTROL_IGNORED ) {
+ switch ( get_continuationBehavior( op ) ) {
+ case SLAP_CH_RESOLVE_CHAINING_REQUIRED:
+ lb->lb_status = LDAP_CH_ERR;
+ return rs->sr_err = LDAP_X_CANNOT_CHAIN;
+
+ default:
+ break;
+ }
+ }
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+ break;
+
+ default:
+ return rs->sr_err;
+ }
+
+ } else if ( op->o_tag == LDAP_REQ_SEARCH && rs->sr_type == REP_SEARCH )
+ {
+ /* strip the entryDN attribute, but keep returning results */
+ (void)ldap_chain_cb_search_response( op, rs );
+ }
+
+ return SLAP_CB_CONTINUE;
+}
+
+static int
+ldap_chain_op(
+ Operation *op,
+ SlapReply *rs,
+ BI_op_func *op_f,
+ BerVarray ref,
+ int depth )
+{
+ slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
+ ldap_chain_cb_t *lb = (ldap_chain_cb_t *)op->o_callback->sc_private;
+ ldap_chain_t *lc = (ldap_chain_t *)on->on_bi.bi_private;
+ struct berval odn = op->o_req_dn,
+ ondn = op->o_req_ndn;
+ ldapinfo_t li = { 0 }, *lip = NULL;
+ struct berval bvuri[ 2 ] = { { 0 } };
+
+ /* NOTE: returned if ref is empty... */
+ int rc = LDAP_OTHER,
+ first_rc;
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ LDAPControl **ctrls = NULL;
+
+ (void)chaining_control_add( lc, op, &ctrls );
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+
+ li.li_bvuri = bvuri;
+ first_rc = -1;
+ for ( ; !BER_BVISNULL( ref ); ref++ ) {
+ SlapReply rs2 = { 0 };
+ LDAPURLDesc *srv = NULL;
+ req_search_s save_oq_search = op->oq_search,
+ tmp_oq_search = { 0 };
+ struct berval dn = BER_BVNULL,
+ pdn = odn,
+ ndn = ondn;
+ char *filter = NULL;
+ int temporary = 0;
+ int free_dn = 0;
+
+ /* We're setting the URI of the first referral;
+ * what if there are more?
+
+Document: RFC 4511
+
+4.1.10. Referral
+ ...
+ If the client wishes to progress the operation, it MUST follow the
+ referral by contacting one of the supported services. If multiple
+ URIs are present, the client assumes that any supported URI may be
+ used to progress the operation.
+
+ * so we actually need to follow exactly one,
+ * and we can assume any is fine.
+ */
+
+ /* parse reference and use
+ * proto://[host][:port]/ only */
+ rc = ldap_url_parse_ext( ref->bv_val, &srv, LDAP_PVT_URL_PARSE_NONE );
+ if ( rc != LDAP_URL_SUCCESS ) {
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_op: unable to parse ref=\"%s\"\n",
+ op->o_log_prefix, ref->bv_val, 0 );
+
+ /* try next */
+ rc = LDAP_OTHER;
+ continue;
+ }
+
+ if ( op->o_tag == LDAP_REQ_SEARCH ) {
+ if ( srv->lud_scope != LDAP_SCOPE_DEFAULT ) {
+ /* RFC 4511: if scope is present, use it */
+ tmp_oq_search.rs_scope = srv->lud_scope;
+
+ } else {
+ /* RFC 4511: if scope is absent, use original */
+ tmp_oq_search.rs_scope = op->ors_scope;
+ }
+ }
+
+ rc = LDAP_SUCCESS;
+ srv->lud_scope = LDAP_SCOPE_DEFAULT;
+ dn.bv_val = srv->lud_dn;
+ filter = srv->lud_filter;
+
+ /* normalize DN */
+ if ( srv->lud_dn == NULL || srv->lud_dn[0] == '\0' ) {
+ if ( srv->lud_dn == NULL ) {
+ srv->lud_dn = "";
+ }
+
+ } else {
+ ber_str2bv( srv->lud_dn, 0, 0, &dn );
+ rc = dnPrettyNormal( NULL, &dn, &pdn, &ndn, op->o_tmpmemctx );
+ if ( rc == LDAP_SUCCESS ) {
+ /* remove DN essentially because later on
+ * ldap_initialize() will parse the URL
+ * as a comma-separated URL list */
+ srv->lud_dn = "";
+ free_dn = 1;
+ }
+ }
+
+ /* prepare filter */
+ if ( rc == LDAP_SUCCESS && op->o_tag == LDAP_REQ_SEARCH ) {
+ /* filter */
+ if ( srv->lud_filter != NULL
+ && srv->lud_filter[0] != '\0'
+ && strcasecmp( srv->lud_filter, "(objectClass=*)" ) != 0 )
+ {
+ /* RFC 4511: if filter is present, use it;
+ * otherwise, use original */
+ tmp_oq_search.rs_filter = str2filter_x( op, srv->lud_filter );
+ if ( tmp_oq_search.rs_filter != NULL ) {
+ filter2bv_x( op, tmp_oq_search.rs_filter, &tmp_oq_search.rs_filterstr );
+
+ } else {
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_op: ref=\"%s\": unable to parse filter=\"%s\"\n",
+ op->o_log_prefix, ref->bv_val, srv->lud_filter );
+ rc = LDAP_OTHER;
+ }
+ }
+ }
+ srv->lud_filter = NULL;
+
+ if ( rc == LDAP_SUCCESS ) {
+ li.li_uri = ldap_url_desc2str( srv );
+ }
+
+ srv->lud_dn = dn.bv_val;
+ srv->lud_filter = filter;
+ ldap_free_urldesc( srv );
+
+ if ( rc != LDAP_SUCCESS ) {
+ /* try next */
+ rc = LDAP_OTHER;
+ continue;
+ }
+
+ if ( li.li_uri == NULL ) {
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_op: ref=\"%s\" unable to reconstruct URI\n",
+ op->o_log_prefix, ref->bv_val, 0 );
+
+ /* try next */
+ rc = LDAP_OTHER;
+ goto further_cleanup;
+ }
+
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_op: ref=\"%s\" -> \"%s\"\n",
+ op->o_log_prefix, ref->bv_val, li.li_uri );
+
+ op->o_req_dn = pdn;
+ op->o_req_ndn = ndn;
+
+ if ( op->o_tag == LDAP_REQ_SEARCH ) {
+ op->ors_scope = tmp_oq_search.rs_scope;
+ if ( tmp_oq_search.rs_filter != NULL ) {
+ op->ors_filter = tmp_oq_search.rs_filter;
+ op->ors_filterstr = tmp_oq_search.rs_filterstr;
+ }
+ }
+
+ ber_str2bv( li.li_uri, 0, 0, &li.li_bvuri[ 0 ] );
+
+ /* Searches for a ldapinfo in the avl tree */
+ ldap_pvt_thread_mutex_lock( &lc->lc_lai.lai_mutex );
+ lip = (ldapinfo_t *)avl_find( lc->lc_lai.lai_tree,
+ (caddr_t)&li, ldap_chain_uri_cmp );
+ ldap_pvt_thread_mutex_unlock( &lc->lc_lai.lai_mutex );
+
+ if ( lip != NULL ) {
+ op->o_bd->be_private = (void *)lip;
+
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_op: ref=\"%s\": URI=\"%s\" found in cache\n",
+ op->o_log_prefix, ref->bv_val, li.li_uri );
+
+ } else {
+ rc = ldap_chain_db_init_one( op->o_bd );
+ if ( rc != 0 ) {
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_op: ref=\"%s\" unable to init back-ldap for URI=\"%s\"\n",
+ op->o_log_prefix, ref->bv_val, li.li_uri );
+ goto cleanup;
+ }
+ lip = (ldapinfo_t *)op->o_bd->be_private;
+ lip->li_uri = li.li_uri;
+ lip->li_bvuri = bvuri;
+ rc = ldap_chain_db_open_one( op->o_bd );
+ if ( rc != 0 ) {
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_op: ref=\"%s\" unable to open back-ldap for URI=\"%s\"\n",
+ op->o_log_prefix, ref->bv_val, li.li_uri );
+ lip->li_uri = NULL;
+ lip->li_bvuri = NULL;
+ (void)ldap_chain_db_destroy_one( op->o_bd, NULL);
+ goto cleanup;
+ }
+
+ if ( LDAP_CHAIN_CACHE_URI( lc ) ) {
+ ldap_pvt_thread_mutex_lock( &lc->lc_lai.lai_mutex );
+ if ( avl_insert( &lc->lc_lai.lai_tree,
+ (caddr_t)lip, ldap_chain_uri_cmp, ldap_chain_uri_dup ) )
+ {
+ /* someone just inserted another;
+ * don't bother, use this and then
+ * just free it */
+ temporary = 1;
+ }
+ ldap_pvt_thread_mutex_unlock( &lc->lc_lai.lai_mutex );
+
+ } else {
+ temporary = 1;
+ }
+
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_op: ref=\"%s\" %s\n",
+ op->o_log_prefix, ref->bv_val, temporary ? "temporary" : "caching" );
+ }
+
+ lb->lb_op_f = op_f;
+ lb->lb_depth = depth + 1;
+
+ rc = op_f( op, &rs2 );
+
+ /* note the first error */
+ if ( first_rc == -1 ) {
+ first_rc = rc;
+ }
+
+cleanup:;
+ ldap_memfree( li.li_uri );
+ li.li_uri = NULL;
+
+ if ( temporary ) {
+ lip->li_uri = NULL;
+ lip->li_bvuri = NULL;
+ (void)ldap_chain_db_close_one( op->o_bd );
+ (void)ldap_chain_db_destroy_one( op->o_bd, NULL );
+ }
+
+further_cleanup:;
+ if ( op->o_req_dn.bv_val == pdn.bv_val ) {
+ op->o_req_dn = odn;
+ op->o_req_ndn = ondn;
+ }
+
+ if ( free_dn ) {
+ op->o_tmpfree( pdn.bv_val, op->o_tmpmemctx );
+ op->o_tmpfree( ndn.bv_val, op->o_tmpmemctx );
+ }
+
+ if ( op->o_tag == LDAP_REQ_SEARCH ) {
+ if ( tmp_oq_search.rs_filter != NULL ) {
+ filter_free_x( op, tmp_oq_search.rs_filter, 1 );
+ }
+
+ if ( !BER_BVISNULL( &tmp_oq_search.rs_filterstr ) ) {
+ slap_sl_free( tmp_oq_search.rs_filterstr.bv_val, op->o_tmpmemctx );
+ }
+
+ op->oq_search = save_oq_search;
+ }
+
+ if ( rc == LDAP_SUCCESS && rs2.sr_err == LDAP_SUCCESS ) {
+ *rs = rs2;
+ break;
+ }
+
+ rc = rs2.sr_err;
+ }
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ (void)chaining_control_remove( op, &ctrls );
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+
+ if ( rc != LDAP_SUCCESS && first_rc > 0 ) {
+ rc = first_rc;
+ }
+
+ return rc;
+}
+
+static int
+ldap_chain_search(
+ Operation *op,
+ SlapReply *rs,
+ BerVarray ref,
+ int depth )
+
+{
+ slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
+ ldap_chain_cb_t *lb = (ldap_chain_cb_t *)op->o_callback->sc_private;
+ ldap_chain_t *lc = (ldap_chain_t *)on->on_bi.bi_private;
+ ldapinfo_t li = { 0 }, *lip = NULL;
+ struct berval bvuri[ 2 ] = { { 0 } };
+
+ struct berval odn = op->o_req_dn,
+ ondn = op->o_req_ndn;
+ Entry *save_entry = rs->sr_entry;
+ slap_mask_t save_flags = rs->sr_flags;
+
+ int rc = LDAP_OTHER,
+ first_rc = -1;
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ LDAPControl **ctrls = NULL;
+
+ (void)chaining_control_add( lc, op, &ctrls );
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+
+ assert( rs->sr_type == REP_SEARCHREF );
+
+ rs->sr_type = REP_SEARCH;
+
+ /* if we parse the URI then by no means
+ * we can cache stuff or reuse connections,
+ * because in back-ldap there's no caching
+ * based on the URI value, which is supposed
+ * to be set once for all (correct?) */
+ li.li_bvuri = bvuri;
+ for ( ; !BER_BVISNULL( &ref[0] ); ref++ ) {
+ SlapReply rs2 = { REP_RESULT };
+ LDAPURLDesc *srv;
+ req_search_s save_oq_search = op->oq_search,
+ tmp_oq_search = { 0 };
+ struct berval dn,
+ pdn = op->o_req_dn,
+ ndn = op->o_req_ndn;
+ char *filter = NULL;
+ int temporary = 0;
+ int free_dn = 0;
+
+ /* parse reference and use
+ * proto://[host][:port]/ only */
+ rc = ldap_url_parse_ext( ref[0].bv_val, &srv, LDAP_PVT_URL_PARSE_NONE );
+ if ( rc != LDAP_URL_SUCCESS ) {
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_search: unable to parse ref=\"%s\"\n",
+ op->o_log_prefix, ref->bv_val, 0 );
+
+ /* try next */
+ rs->sr_err = LDAP_OTHER;
+ continue;
+ }
+
+ if ( srv->lud_scope != LDAP_SCOPE_DEFAULT ) {
+ /* RFC 4511: if scope is present, use it */
+ tmp_oq_search.rs_scope = srv->lud_scope;
+
+ } else {
+ /* RFC 4511: if scope is absent, use original */
+ /* Section 4.5.3: if scope is onelevel, use base */
+ if ( op->ors_scope == LDAP_SCOPE_ONELEVEL )
+ tmp_oq_search.rs_scope = LDAP_SCOPE_BASE;
+ else
+ tmp_oq_search.rs_scope = op->ors_scope;
+ }
+
+ rc = LDAP_SUCCESS;
+ srv->lud_scope = LDAP_SCOPE_DEFAULT;
+ dn.bv_val = srv->lud_dn;
+ filter = srv->lud_filter;
+
+ /* normalize DN */
+ if ( srv->lud_dn == NULL || srv->lud_dn[0] == '\0' ) {
+ if ( srv->lud_dn == NULL ) {
+ srv->lud_dn = "";
+ }
+
+ if ( save_entry != NULL ) {
+ /* use the "right" DN, if available */
+ pdn = save_entry->e_name;
+ ndn = save_entry->e_nname;
+ } /* else leave the original req DN in place, if any RFC 4511 */
+
+ } else {
+ /* RFC 4511: if DN is present, use it */
+ ber_str2bv( srv->lud_dn, 0, 0, &dn );
+ rc = dnPrettyNormal( NULL, &dn, &pdn, &ndn, op->o_tmpmemctx );
+ if ( rc == LDAP_SUCCESS ) {
+ /* remove DN essentially because later on
+ * ldap_initialize() will parse the URL
+ * as a comma-separated URL list */
+ srv->lud_dn = "";
+ free_dn = 1;
+ }
+ }
+
+ /* prepare filter */
+ if ( rc == LDAP_SUCCESS ) {
+ /* filter */
+ if ( srv->lud_filter != NULL
+ && srv->lud_filter[0] != '\0'
+ && strcasecmp( srv->lud_filter, "(objectClass=*)" ) != 0 )
+ {
+ /* RFC 4511: if filter is present, use it;
+ * otherwise, use original */
+ tmp_oq_search.rs_filter = str2filter_x( op, srv->lud_filter );
+ if ( tmp_oq_search.rs_filter != NULL ) {
+ filter2bv_x( op, tmp_oq_search.rs_filter, &tmp_oq_search.rs_filterstr );
+
+ } else {
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_search: ref=\"%s\": unable to parse filter=\"%s\"\n",
+ op->o_log_prefix, ref->bv_val, srv->lud_filter );
+ rc = LDAP_OTHER;
+ }
+ }
+ }
+ srv->lud_filter = NULL;
+
+ if ( rc == LDAP_SUCCESS ) {
+ li.li_uri = ldap_url_desc2str( srv );
+ }
+
+ srv->lud_dn = dn.bv_val;
+ srv->lud_filter = filter;
+ ldap_free_urldesc( srv );
+
+ if ( rc != LDAP_SUCCESS || li.li_uri == NULL ) {
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_search: ref=\"%s\" unable to reconstruct URI\n",
+ op->o_log_prefix, ref->bv_val, 0 );
+
+ /* try next */
+ rc = LDAP_OTHER;
+ goto further_cleanup;
+ }
+
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_search: ref=\"%s\" -> \"%s\"\n",
+ op->o_log_prefix, ref->bv_val, li.li_uri );
+
+ op->o_req_dn = pdn;
+ op->o_req_ndn = ndn;
+ op->ors_scope = tmp_oq_search.rs_scope;
+ if ( tmp_oq_search.rs_filter != NULL ) {
+ op->ors_filter = tmp_oq_search.rs_filter;
+ op->ors_filterstr = tmp_oq_search.rs_filterstr;
+ }
+
+ ber_str2bv( li.li_uri, 0, 0, &li.li_bvuri[ 0 ] );
+
+ /* Searches for a ldapinfo in the avl tree */
+ ldap_pvt_thread_mutex_lock( &lc->lc_lai.lai_mutex );
+ lip = (ldapinfo_t *)avl_find( lc->lc_lai.lai_tree,
+ (caddr_t)&li, ldap_chain_uri_cmp );
+ ldap_pvt_thread_mutex_unlock( &lc->lc_lai.lai_mutex );
+
+ if ( lip != NULL ) {
+ op->o_bd->be_private = (void *)lip;
+
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_search: ref=\"%s\": URI=\"%s\" found in cache\n",
+ op->o_log_prefix, ref->bv_val, li.li_uri );
+
+ } else {
+ /* if none is found, create a temporary... */
+ rc = ldap_chain_db_init_one( op->o_bd );
+ if ( rc != 0 ) {
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_search: ref=\"%s\" unable to init back-ldap for URI=\"%s\"\n",
+ op->o_log_prefix, ref->bv_val, li.li_uri );
+ goto cleanup;
+ }
+ lip = (ldapinfo_t *)op->o_bd->be_private;
+ lip->li_uri = li.li_uri;
+ lip->li_bvuri = bvuri;
+ rc = ldap_chain_db_open_one( op->o_bd );
+ if ( rc != 0 ) {
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_search: ref=\"%s\" unable to open back-ldap for URI=\"%s\"\n",
+ op->o_log_prefix, ref->bv_val, li.li_uri );
+ lip->li_uri = NULL;
+ lip->li_bvuri = NULL;
+ (void)ldap_chain_db_destroy_one( op->o_bd, NULL );
+ goto cleanup;
+ }
+
+ if ( LDAP_CHAIN_CACHE_URI( lc ) ) {
+ ldap_pvt_thread_mutex_lock( &lc->lc_lai.lai_mutex );
+ if ( avl_insert( &lc->lc_lai.lai_tree,
+ (caddr_t)lip, ldap_chain_uri_cmp, ldap_chain_uri_dup ) )
+ {
+ /* someone just inserted another;
+ * don't bother, use this and then
+ * just free it */
+ temporary = 1;
+ }
+ ldap_pvt_thread_mutex_unlock( &lc->lc_lai.lai_mutex );
+
+ } else {
+ temporary = 1;
+ }
+
+ Debug( LDAP_DEBUG_TRACE, "%s ldap_chain_search: ref=\"%s\" %s\n",
+ op->o_log_prefix, ref->bv_val, temporary ? "temporary" : "caching" );
+ }
+
+ lb->lb_op_f = lback->bi_op_search;
+ lb->lb_depth = depth + 1;
+
+ /* FIXME: should we also copy filter and scope?
+ * according to RFC3296, no */
+ rc = lback->bi_op_search( op, &rs2 );
+ if ( first_rc == -1 ) {
+ first_rc = rc;
+ }
+
+cleanup:;
+ ldap_memfree( li.li_uri );
+ li.li_uri = NULL;
+
+ if ( temporary ) {
+ lip->li_uri = NULL;
+ lip->li_bvuri = NULL;
+ (void)ldap_chain_db_close_one( op->o_bd );
+ (void)ldap_chain_db_destroy_one( op->o_bd, NULL );
+ }
+
+further_cleanup:;
+ if ( op->o_req_dn.bv_val == pdn.bv_val ) {
+ op->o_req_dn = odn;
+ op->o_req_ndn = ondn;
+ }
+
+ if ( free_dn ) {
+ op->o_tmpfree( pdn.bv_val, op->o_tmpmemctx );
+ op->o_tmpfree( ndn.bv_val, op->o_tmpmemctx );
+ }
+
+ if ( tmp_oq_search.rs_filter != NULL ) {
+ filter_free_x( op, tmp_oq_search.rs_filter, 1 );
+ }
+
+ if ( !BER_BVISNULL( &tmp_oq_search.rs_filterstr ) ) {
+ slap_sl_free( tmp_oq_search.rs_filterstr.bv_val, op->o_tmpmemctx );
+ }
+
+ op->oq_search = save_oq_search;
+
+ if ( rc == LDAP_SUCCESS && rs2.sr_err == LDAP_SUCCESS ) {
+ *rs = rs2;
+ break;
+ }
+
+ rc = rs2.sr_err;
+ }
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ (void)chaining_control_remove( op, &ctrls );
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+
+ rs->sr_type = REP_SEARCHREF;
+ rs->sr_entry = save_entry;
+ rs->sr_flags = save_flags;
+
+ if ( rc != LDAP_SUCCESS ) {
+ /* couldn't chase any of the referrals */
+ if ( first_rc != -1 ) {
+ rc = first_rc;
+
+ } else {
+ rc = SLAP_CB_CONTINUE;
+ }
+ }
+
+ return rc;
+}
+
+static int
+ldap_chain_response( Operation *op, SlapReply *rs )
+{
+ slap_overinst *on = (slap_overinst *)op->o_bd->bd_info;
+ ldap_chain_t *lc = (ldap_chain_t *)on->on_bi.bi_private;
+ BackendDB db, *bd = op->o_bd;
+ ldap_chain_cb_t lb = { 0 };
+ slap_callback *sc = op->o_callback,
+ sc2 = { 0 };
+ int rc = 0;
+ const char *text = NULL;
+ const char *matched;
+ BerVarray ref;
+ struct berval ndn = op->o_ndn;
+
+ int sr_err = rs->sr_err;
+ slap_reply_t sr_type = rs->sr_type;
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ slap_mask_t chain_mask = 0;
+ ber_len_t chain_shift = 0;
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+
+ if ( rs->sr_err != LDAP_REFERRAL && rs->sr_type != REP_SEARCHREF ) {
+ return SLAP_CB_CONTINUE;
+ }
+ if ( !rs->sr_ref ) {
+ return SLAP_CB_CONTINUE;
+ }
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ if ( rs->sr_err == LDAP_REFERRAL && get_chaining( op ) > SLAP_CONTROL_IGNORED ) {
+ switch ( get_resolveBehavior( op ) ) {
+ case SLAP_CH_RESOLVE_REFERRALS_PREFERRED:
+ case SLAP_CH_RESOLVE_REFERRALS_REQUIRED:
+ return SLAP_CB_CONTINUE;
+
+ default:
+ chain_mask = SLAP_CH_RESOLVE_MASK;
+ chain_shift = SLAP_CH_RESOLVE_SHIFT;
+ break;
+ }
+
+ } else if ( rs->sr_type == REP_SEARCHREF && get_chaining( op ) > SLAP_CONTROL_IGNORED ) {
+ switch ( get_continuationBehavior( op ) ) {
+ case SLAP_CH_CONTINUATION_REFERRALS_PREFERRED:
+ case SLAP_CH_CONTINUATION_REFERRALS_REQUIRED:
+ return SLAP_CB_CONTINUE;
+
+ default:
+ chain_mask = SLAP_CH_CONTINUATION_MASK;
+ chain_shift = SLAP_CH_CONTINUATION_SHIFT;
+ break;
+ }
+ }
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+
+ /*
+ * TODO: add checks on who/when chain operations; e.g.:
+ * a) what identities are authorized
+ * b) what request DN (e.g. only chain requests rooted at <DN>)
+ * c) what referral URIs
+ * d) what protocol scheme (e.g. only ldaps://)
+ * e) what ssf
+ */
+
+ db = *op->o_bd;
+ SLAP_DBFLAGS( &db ) &= ~SLAP_DBFLAG_MONITORING;
+ op->o_bd = &db;
+
+ text = rs->sr_text;
+ rs->sr_text = NULL;
+ matched = rs->sr_matched;
+ rs->sr_matched = NULL;
+ ref = rs->sr_ref;
+ rs->sr_ref = NULL;
+
+ /* we need this to know if back-ldap returned any result */
+ lb.lb_lc = lc;
+ sc2.sc_next = sc->sc_next;
+ sc2.sc_private = &lb;
+ sc2.sc_response = ldap_chain_cb_response;
+ op->o_callback = &sc2;
+
+ /* Chaining can be performed by a privileged user on behalf
+ * of normal users, using the ProxyAuthz control, by exploiting
+ * the identity assertion feature of back-ldap; see idassert-*
+ * directives in slapd-ldap(5).
+ *
+ * FIXME: the idassert-authcDN is one, will it be fine regardless
+ * of the URI we obtain from the referral?
+ */
+
+ switch ( op->o_tag ) {
+ case LDAP_REQ_BIND: {
+ struct berval rndn = op->o_req_ndn;
+ Connection *conn = op->o_conn;
+
+ /* FIXME: can we really get a referral for binds? */
+ op->o_req_ndn = slap_empty_bv;
+ op->o_conn = NULL;
+ rc = ldap_chain_op( op, rs, lback->bi_op_bind, ref, 0 );
+ op->o_req_ndn = rndn;
+ op->o_conn = conn;
+ }
+ break;
+
+ case LDAP_REQ_ADD:
+ rc = ldap_chain_op( op, rs, lback->bi_op_add, ref, 0 );
+ break;
+
+ case LDAP_REQ_DELETE:
+ rc = ldap_chain_op( op, rs, lback->bi_op_delete, ref, 0 );
+ break;
+
+ case LDAP_REQ_MODRDN:
+ rc = ldap_chain_op( op, rs, lback->bi_op_modrdn, ref, 0 );
+ break;
+
+ case LDAP_REQ_MODIFY:
+ rc = ldap_chain_op( op, rs, lback->bi_op_modify, ref, 0 );
+ break;
+
+ case LDAP_REQ_COMPARE:
+ rc = ldap_chain_op( op, rs, lback->bi_op_compare, ref, 0 );
+ if ( rs->sr_err == LDAP_COMPARE_TRUE || rs->sr_err == LDAP_COMPARE_FALSE ) {
+ rc = LDAP_SUCCESS;
+ }
+ break;
+
+ case LDAP_REQ_SEARCH:
+ if ( rs->sr_type == REP_SEARCHREF ) {
+ sc2.sc_response = ldap_chain_cb_search_response;
+ rc = ldap_chain_search( op, rs, ref, 0 );
+
+ } else {
+ /* we might get here before any database actually
+ * performed a search; in those cases, we need
+ * to check limits, to make sure safe defaults
+ * are in place */
+ if ( op->ors_limit != NULL || limits_check( op, rs ) == 0 ) {
+ rc = ldap_chain_op( op, rs, lback->bi_op_search, ref, 0 );
+
+ } else {
+ rc = SLAP_CB_CONTINUE;
+ }
+ }
+ break;
+
+ case LDAP_REQ_EXTENDED:
+ rc = ldap_chain_op( op, rs, lback->bi_extended, ref, 0 );
+ /* FIXME: ldap_back_extended() by design
+ * doesn't send result; frontend is expected
+ * to send it... */
+ /* FIXME: what about chaining? */
+ if ( rc != SLAPD_ABANDON ) {
+ rs->sr_err = rc;
+ send_ldap_extended( op, rs );
+ rc = LDAP_SUCCESS;
+ }
+ lb.lb_status = LDAP_CH_RES;
+ break;
+
+ default:
+ rc = SLAP_CB_CONTINUE;
+ break;
+ }
+
+ switch ( rc ) {
+ case SLAPD_ABANDON:
+ goto dont_chain;
+
+ case LDAP_SUCCESS:
+ case LDAP_REFERRAL:
+ sr_err = rs->sr_err;
+ /* slapd-ldap sent response */
+ if ( !op->o_abandon && lb.lb_status != LDAP_CH_RES ) {
+ /* FIXME: should we send response? */
+ Debug( LDAP_DEBUG_ANY,
+ "%s: ldap_chain_response: "
+ "overlay should have sent result.\n",
+ op->o_log_prefix, 0, 0 );
+ }
+ break;
+
+ default:
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ if ( lb.lb_status == LDAP_CH_ERR && rs->sr_err == LDAP_X_CANNOT_CHAIN ) {
+ goto cannot_chain;
+ }
+
+ switch ( ( get_chainingBehavior( op ) & chain_mask ) >> chain_shift ) {
+ case LDAP_CHAINING_REQUIRED:
+cannot_chain:;
+ op->o_callback = NULL;
+ send_ldap_error( op, rs, LDAP_X_CANNOT_CHAIN,
+ "operation cannot be completed without chaining" );
+ goto dont_chain;
+
+ default:
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+ if ( LDAP_CHAIN_RETURN_ERR( lc ) ) {
+ sr_err = rs->sr_err = rc;
+ rs->sr_type = sr_type;
+
+ } else {
+ rc = SLAP_CB_CONTINUE;
+ rs->sr_err = sr_err;
+ rs->sr_type = sr_type;
+ rs->sr_text = text;
+ rs->sr_matched = matched;
+ rs->sr_ref = ref;
+ }
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ break;
+ }
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+ }
+
+ if ( lb.lb_status == LDAP_CH_NONE && rc != SLAPD_ABANDON ) {
+ /* give the remaining callbacks a chance */
+ op->o_callback = sc->sc_next;
+ rc = rs->sr_err = slap_map_api2result( rs );
+ send_ldap_result( op, rs );
+ }
+
+dont_chain:;
+ rs->sr_err = sr_err;
+ rs->sr_type = sr_type;
+ rs->sr_text = text;
+ rs->sr_matched = matched;
+ rs->sr_ref = ref;
+ op->o_bd = bd;
+ op->o_callback = sc;
+ op->o_ndn = ndn;
+
+ return rc;
+}
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+static int
+ldap_chain_parse_ctrl(
+ Operation *op,
+ SlapReply *rs,
+ LDAPControl *ctrl );
+
+static int
+str2chain( const char *s )
+{
+ if ( strcasecmp( s, "chainingPreferred" ) == 0 ) {
+ return LDAP_CHAINING_PREFERRED;
+
+ } else if ( strcasecmp( s, "chainingRequired" ) == 0 ) {
+ return LDAP_CHAINING_REQUIRED;
+
+ } else if ( strcasecmp( s, "referralsPreferred" ) == 0 ) {
+ return LDAP_REFERRALS_PREFERRED;
+
+ } else if ( strcasecmp( s, "referralsRequired" ) == 0 ) {
+ return LDAP_REFERRALS_REQUIRED;
+ }
+
+ return -1;
+}
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+
+/*
+ * configuration...
+ */
+
+enum {
+ CH_CHAINING = 1,
+ CH_CACHE_URI,
+ CH_MAX_DEPTH,
+ CH_RETURN_ERR,
+
+ CH_LAST
+};
+
+static ConfigDriver chain_cf_gen;
+static ConfigCfAdd chain_cfadd;
+static ConfigLDAPadd chain_ldadd;
+#ifdef SLAP_CONFIG_DELETE
+static ConfigLDAPdel chain_lddel;
+#endif
+
+static ConfigTable chaincfg[] = {
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ { "chain-chaining", "args",
+ 2, 4, 0, ARG_MAGIC|ARG_BERVAL|CH_CHAINING, chain_cf_gen,
+ "( OLcfgOvAt:3.1 NAME 'olcChainingBehavior' "
+ "DESC 'Chaining behavior control parameters (draft-sermersheim-ldap-chaining)' "
+ "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+ { "chain-cache-uri", "TRUE/FALSE",
+ 2, 2, 0, ARG_MAGIC|ARG_ON_OFF|CH_CACHE_URI, chain_cf_gen,
+ "( OLcfgOvAt:3.2 NAME 'olcChainCacheURI' "
+ "DESC 'Enables caching of URIs not present in configuration' "
+ "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
+ { "chain-max-depth", "args",
+ 2, 2, 0, ARG_MAGIC|ARG_INT|CH_MAX_DEPTH, chain_cf_gen,
+ "( OLcfgOvAt:3.3 NAME 'olcChainMaxReferralDepth' "
+ "DESC 'max referral depth' "
+ "SYNTAX OMsInteger "
+ "EQUALITY integerMatch "
+ "SINGLE-VALUE )", NULL, NULL },
+ { "chain-return-error", "TRUE/FALSE",
+ 2, 2, 0, ARG_MAGIC|ARG_ON_OFF|CH_RETURN_ERR, chain_cf_gen,
+ "( OLcfgOvAt:3.4 NAME 'olcChainReturnError' "
+ "DESC 'Errors are returned instead of the original referral' "
+ "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
+ { NULL, NULL, 0, 0, 0, ARG_IGNORED }
+};
+
+static ConfigOCs chainocs[] = {
+ { "( OLcfgOvOc:3.1 "
+ "NAME 'olcChainConfig' "
+ "DESC 'Chain configuration' "
+ "SUP olcOverlayConfig "
+ "MAY ( "
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ "olcChainingBehavior $ "
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+ "olcChainCacheURI $ "
+ "olcChainMaxReferralDepth $ "
+ "olcChainReturnError "
+ ") )",
+ Cft_Overlay, chaincfg, NULL, chain_cfadd },
+ { "( OLcfgOvOc:3.2 "
+ "NAME 'olcChainDatabase' "
+ "DESC 'Chain remote server configuration' "
+ "AUXILIARY )",
+ Cft_Misc, NULL, chain_ldadd
+#ifdef SLAP_CONFIG_DELETE
+ , NULL, chain_lddel
+#endif
+ },
+ { NULL, 0, NULL }
+};
+
+static int
+chain_ldadd( CfEntryInfo *p, Entry *e, ConfigArgs *ca )
+{
+ slap_overinst *on;
+ ldap_chain_t *lc;
+
+ ldapinfo_t *li;
+
+ AttributeDescription *ad = NULL;
+ Attribute *at;
+ const char *text;
+
+ int rc;
+
+ if ( p->ce_type != Cft_Overlay
+ || !p->ce_bi
+ || p->ce_bi->bi_cf_ocs != chainocs )
+ {
+ return LDAP_CONSTRAINT_VIOLATION;
+ }
+
+ on = (slap_overinst *)p->ce_bi;
+ lc = (ldap_chain_t *)on->on_bi.bi_private;
+
+ assert( ca->be == NULL );
+ ca->be = (BackendDB *)ch_calloc( 1, sizeof( BackendDB ) );
+
+ ca->be->bd_info = (BackendInfo *)on;
+
+ rc = slap_str2ad( "olcDbURI", &ad, &text );
+ assert( rc == LDAP_SUCCESS );
+
+ at = attr_find( e->e_attrs, ad );
+#if 0
+ if ( lc->lc_common_li == NULL && at != NULL ) {
+ /* FIXME: we should generate an empty default entry
+ * if none is supplied */
+ Debug( LDAP_DEBUG_ANY, "slapd-chain: "
+ "first underlying database \"%s\" "
+ "cannot contain attribute \"%s\".\n",
+ e->e_name.bv_val, ad->ad_cname.bv_val, 0 );
+ rc = LDAP_CONSTRAINT_VIOLATION;
+ goto done;
+
+ } else
+#endif
+ if ( lc->lc_common_li != NULL && lc->lc_common_li != lc->lc_cfg_li && at == NULL ) {
+ /* FIXME: we should generate an empty default entry
+ * if none is supplied */
+ Debug( LDAP_DEBUG_ANY, "slapd-chain: "
+ "subsequent underlying database \"%s\" "
+ "must contain attribute \"%s\".\n",
+ e->e_name.bv_val, ad->ad_cname.bv_val, 0 );
+ rc = LDAP_CONSTRAINT_VIOLATION;
+ goto done;
+ }
+
+ if ( lc->lc_common_li == NULL ) {
+ rc = ldap_chain_db_init_common( ca->be );
+ if ( rc != 0 )
+ goto fail;
+ li = ca->be->be_private;
+ lc->lc_common_li = lc->lc_cfg_li = li;
+
+ }
+ rc = ldap_chain_db_init_one( ca->be );
+ lc->lc_cfg_li = NULL;
+
+ if ( rc != 0 ) {
+fail:
+ Debug( LDAP_DEBUG_ANY, "slapd-chain: "
+ "unable to init %sunderlying database \"%s\".\n",
+ lc->lc_common_li == NULL ? "common " : "", e->e_name.bv_val, 0 );
+ return LDAP_CONSTRAINT_VIOLATION;
+ }
+
+ li = ca->be->be_private;
+
+ if ( at ) {
+ char **urls;
+
+ urls = ldap_str2charray( at->a_vals[ 0 ].bv_val, ", \t" );
+ if ( !urls || !urls[0] || urls[1] ) {
+ ldap_charray_free( urls );
+ Debug( LDAP_DEBUG_ANY, "slapd-chain: "
+ "olcDbURI must contain exactly one url, got %s\n",
+ at->a_vals[ 0 ].bv_val, 0, 0 );
+ rc = LDAP_CONSTRAINT_VIOLATION;
+ goto done;
+ }
+ ldap_charray_free( urls );
+
+ li->li_uri = ch_strdup( at->a_vals[ 0 ].bv_val );
+ value_add_one( &li->li_bvuri, &at->a_vals[ 0 ] );
+ if ( avl_insert( &lc->lc_lai.lai_tree, (caddr_t)li,
+ ldap_chain_uri_cmp, ldap_chain_uri_dup ) )
+ {
+ Debug( LDAP_DEBUG_ANY, "slapd-chain: "
+ "database \"%s\" insert failed.\n",
+ e->e_name.bv_val, 0, 0 );
+ rc = LDAP_CONSTRAINT_VIOLATION;
+ goto done;
+ }
+ }
+
+ ca->ca_private = on;
+
+done:;
+ if ( rc != LDAP_SUCCESS ) {
+ (void)ldap_chain_db_destroy_one( ca->be, NULL );
+ ch_free( ca->be );
+ ca->be = NULL;
+ }
+
+ return rc;
+}
+
+typedef struct ldap_chain_cfadd_apply_t {
+ Operation *op;
+ SlapReply *rs;
+ Entry *p;
+ ConfigArgs *ca;
+ int count;
+} ldap_chain_cfadd_apply_t;
+
+static int
+ldap_chain_cfadd_apply( void *datum, void *arg )
+{
+ ldapinfo_t *li = (ldapinfo_t *)datum;
+ ldap_chain_cfadd_apply_t *lca = (ldap_chain_cfadd_apply_t *)arg;
+
+ struct berval bv;
+
+ /* FIXME: should not hardcode "olcDatabase" here */
+ bv.bv_len = snprintf( lca->ca->cr_msg, sizeof( lca->ca->cr_msg ),
+ "olcDatabase={%d}%s", lca->count, lback->bi_type );
+ bv.bv_val = lca->ca->cr_msg;
+
+ lca->ca->be->be_private = (void *)li;
+ config_build_entry( lca->op, lca->rs, lca->p->e_private, lca->ca,
+ &bv, lback->bi_cf_ocs, &chainocs[1] );
+
+ lca->count++;
+
+ return 0;
+}
+
+static int
+chain_cfadd( Operation *op, SlapReply *rs, Entry *p, ConfigArgs *ca )
+{
+ CfEntryInfo *pe = p->e_private;
+ slap_overinst *on = (slap_overinst *)pe->ce_bi;
+ ldap_chain_t *lc = (ldap_chain_t *)on->on_bi.bi_private;
+ void *priv = (void *)ca->be->be_private;
+
+ if ( lback->bi_cf_ocs ) {
+ ldap_chain_cfadd_apply_t lca = { 0 };
+
+ lca.op = op;
+ lca.rs = rs;
+ lca.p = p;
+ lca.ca = ca;
+ lca.count = 0;
+
+ (void)ldap_chain_cfadd_apply( (void *)lc->lc_common_li, (void *)&lca );
+
+ (void)avl_apply( lc->lc_lai.lai_tree, ldap_chain_cfadd_apply,
+ &lca, 1, AVL_INORDER );
+
+ ca->be->be_private = priv;
+ }
+
+ lc->lc_cfg_li = NULL;
+
+ return 0;
+}
+
+#ifdef SLAP_CONFIG_DELETE
+static int
+chain_lddel( CfEntryInfo *ce, Operation *op )
+{
+ CfEntryInfo *pe = ce->ce_parent;
+ slap_overinst *on = (slap_overinst *)pe->ce_bi;
+ ldap_chain_t *lc = (ldap_chain_t *)on->on_bi.bi_private;
+ ldapinfo_t *li = (ldapinfo_t *) ce->ce_be->be_private;
+
+ if ( li != lc->lc_common_li ) {
+ if (! avl_delete( &lc->lc_lai.lai_tree, li, ldap_chain_uri_cmp ) ) {
+ Debug( LDAP_DEBUG_ANY, "slapd-chain: avl_delete failed. "
+ "\"%s\" not found.\n", li->li_uri, 0, 0 );
+ return -1;
+ }
+ } else if ( lc->lc_lai.lai_tree ) {
+ Debug( LDAP_DEBUG_ANY, "slapd-chain: cannot delete first underlying "
+ "LDAP database when other databases are still present.\n", 0, 0, 0 );
+ return -1;
+ } else {
+ lc->lc_common_li = NULL;
+ }
+
+ ce->ce_be->bd_info = lback;
+
+ if ( ce->ce_be->bd_info->bi_db_close ) {
+ ce->ce_be->bd_info->bi_db_close( ce->ce_be, NULL );
+ }
+ if ( ce->ce_be->bd_info->bi_db_destroy ) {
+ ce->ce_be->bd_info->bi_db_destroy( ce->ce_be, NULL );
+ }
+
+ ch_free(ce->ce_be);
+ ce->ce_be = NULL;
+
+ return LDAP_SUCCESS;
+}
+#endif /* SLAP_CONFIG_DELETE */
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+static slap_verbmasks chaining_mode[] = {
+ { BER_BVC("referralsRequired"), LDAP_REFERRALS_REQUIRED },
+ { BER_BVC("referralsPreferred"), LDAP_REFERRALS_PREFERRED },
+ { BER_BVC("chainingRequired"), LDAP_CHAINING_REQUIRED },
+ { BER_BVC("chainingPreferred"), LDAP_CHAINING_PREFERRED },
+ { BER_BVNULL, 0 }
+};
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+
+static int
+chain_cf_gen( ConfigArgs *c )
+{
+ slap_overinst *on = (slap_overinst *)c->bi;
+ ldap_chain_t *lc = (ldap_chain_t *)on->on_bi.bi_private;
+
+ int rc = 0;
+
+ if ( c->op == SLAP_CONFIG_EMIT ) {
+ switch( c->type ) {
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ case CH_CHAINING: {
+ struct berval resolve = BER_BVNULL,
+ continuation = BER_BVNULL;
+
+ if ( !LDAP_CHAIN_CHAINING( lc ) ) {
+ return 1;
+ }
+
+ enum_to_verb( chaining_mode, ( ( lc->lc_chaining_ctrlflag & SLAP_CH_RESOLVE_MASK ) >> SLAP_CH_RESOLVE_SHIFT ), &resolve );
+ enum_to_verb( chaining_mode, ( ( lc->lc_chaining_ctrlflag & SLAP_CH_CONTINUATION_MASK ) >> SLAP_CH_CONTINUATION_SHIFT ), &continuation );
+
+ c->value_bv.bv_len = STRLENOF( "resolve=" ) + resolve.bv_len
+ + STRLENOF( " " )
+ + STRLENOF( "continuation=" ) + continuation.bv_len;
+ c->value_bv.bv_val = ch_malloc( c->value_bv.bv_len + 1 );
+ snprintf( c->value_bv.bv_val, c->value_bv.bv_len + 1,
+ "resolve=%s continuation=%s",
+ resolve.bv_val, continuation.bv_val );
+
+ if ( lc->lc_chaining_ctrl.ldctl_iscritical ) {
+ c->value_bv.bv_val = ch_realloc( c->value_bv.bv_val,
+ c->value_bv.bv_len + STRLENOF( " critical" ) + 1 );
+ AC_MEMCPY( &c->value_bv.bv_val[ c->value_bv.bv_len ],
+ " critical", STRLENOF( " critical" ) + 1 );
+ c->value_bv.bv_len += STRLENOF( " critical" );
+ }
+
+ break;
+ }
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+
+ case CH_CACHE_URI:
+ c->value_int = LDAP_CHAIN_CACHE_URI( lc );
+ break;
+
+ case CH_MAX_DEPTH:
+ c->value_int = lc->lc_max_depth;
+ break;
+
+ case CH_RETURN_ERR:
+ c->value_int = LDAP_CHAIN_RETURN_ERR( lc );
+ break;
+
+ default:
+ assert( 0 );
+ rc = 1;
+ }
+ return rc;
+
+ } else if ( c->op == LDAP_MOD_DELETE ) {
+ switch( c->type ) {
+ case CH_CHAINING:
+ return 1;
+
+ case CH_CACHE_URI:
+ lc->lc_flags &= ~LDAP_CHAIN_F_CACHE_URI;
+ break;
+
+ case CH_MAX_DEPTH:
+ c->value_int = 0;
+ break;
+
+ case CH_RETURN_ERR:
+ lc->lc_flags &= ~LDAP_CHAIN_F_RETURN_ERR;
+ break;
+
+ default:
+ return 1;
+ }
+ return rc;
+ }
+
+ switch( c->type ) {
+ case CH_CHAINING: {
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ char **argv = c->argv;
+ int argc = c->argc;
+ BerElementBuffer berbuf;
+ BerElement *ber = (BerElement *)&berbuf;
+ int resolve = -1,
+ continuation = -1,
+ iscritical = 0;
+ Operation op = { 0 };
+ SlapReply rs = { 0 };
+
+ lc->lc_chaining_ctrlflag = 0;
+
+ for ( argc--, argv++; argc > 0; argc--, argv++ ) {
+ if ( strncasecmp( argv[ 0 ], "resolve=", STRLENOF( "resolve=" ) ) == 0 ) {
+ resolve = str2chain( argv[ 0 ] + STRLENOF( "resolve=" ) );
+ if ( resolve == -1 ) {
+ Debug( LDAP_DEBUG_ANY, "%s: "
+ "illegal <resolve> value %s "
+ "in \"chain-chaining>\".\n",
+ c->log, argv[ 0 ], 0 );
+ return 1;
+ }
+
+ } else if ( strncasecmp( argv[ 0 ], "continuation=", STRLENOF( "continuation=" ) ) == 0 ) {
+ continuation = str2chain( argv[ 0 ] + STRLENOF( "continuation=" ) );
+ if ( continuation == -1 ) {
+ Debug( LDAP_DEBUG_ANY, "%s: "
+ "illegal <continuation> value %s "
+ "in \"chain-chaining\".\n",
+ c->log, argv[ 0 ], 0 );
+ return 1;
+ }
+
+ } else if ( strcasecmp( argv[ 0 ], "critical" ) == 0 ) {
+ iscritical = 1;
+
+ } else {
+ Debug( LDAP_DEBUG_ANY, "%s: "
+ "unknown option in \"chain-chaining\".\n",
+ c->log, 0, 0 );
+ return 1;
+ }
+ }
+
+ if ( resolve != -1 || continuation != -1 ) {
+ int err;
+
+ if ( resolve == -1 ) {
+ /* default */
+ resolve = SLAP_CHAINING_DEFAULT;
+ }
+
+ ber_init2( ber, NULL, LBER_USE_DER );
+
+ err = ber_printf( ber, "{e" /* } */, resolve );
+ if ( err == -1 ) {
+ ber_free( ber, 1 );
+ Debug( LDAP_DEBUG_ANY, "%s: "
+ "chaining behavior control encoding error!\n",
+ c->log, 0, 0 );
+ return 1;
+ }
+
+ if ( continuation > -1 ) {
+ err = ber_printf( ber, "e", continuation );
+ if ( err == -1 ) {
+ ber_free( ber, 1 );
+ Debug( LDAP_DEBUG_ANY, "%s: "
+ "chaining behavior control encoding error!\n",
+ c->log, 0, 0 );
+ return 1;
+ }
+ }
+
+ err = ber_printf( ber, /* { */ "N}" );
+ if ( err == -1 ) {
+ ber_free( ber, 1 );
+ Debug( LDAP_DEBUG_ANY, "%s: "
+ "chaining behavior control encoding error!\n",
+ c->log, 0, 0 );
+ return 1;
+ }
+
+ if ( ber_flatten2( ber, &lc->lc_chaining_ctrl.ldctl_value, 0 ) == -1 ) {
+ exit( EXIT_FAILURE );
+ }
+
+ } else {
+ BER_BVZERO( &lc->lc_chaining_ctrl.ldctl_value );
+ }
+
+ lc->lc_chaining_ctrl.ldctl_oid = LDAP_CONTROL_X_CHAINING_BEHAVIOR;
+ lc->lc_chaining_ctrl.ldctl_iscritical = iscritical;
+
+ if ( ldap_chain_parse_ctrl( &op, &rs, &lc->lc_chaining_ctrl ) != LDAP_SUCCESS )
+ {
+ Debug( LDAP_DEBUG_ANY, "%s: "
+ "unable to parse chaining control%s%s.\n",
+ c->log, rs.sr_text ? ": " : "",
+ rs.sr_text ? rs.sr_text : "" );
+ return 1;
+ }
+
+ lc->lc_chaining_ctrlflag = op.o_chaining;
+
+ lc->lc_flags |= LDAP_CHAIN_F_CHAINING;
+
+ rc = 0;
+#else /* ! LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+ Debug( LDAP_DEBUG_ANY, "%s: "
+ "\"chaining\" control unsupported (ignored).\n",
+ c->log, 0, 0 );
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+ } break;
+
+ case CH_CACHE_URI:
+ if ( c->value_int ) {
+ lc->lc_flags |= LDAP_CHAIN_F_CACHE_URI;
+ } else {
+ lc->lc_flags &= ~LDAP_CHAIN_F_CACHE_URI;
+ }
+ break;
+
+ case CH_MAX_DEPTH:
+ if ( c->value_int < 0 ) {
+ snprintf( c->cr_msg, sizeof( c->cr_msg ),
+ "<%s> invalid max referral depth %d",
+ c->argv[0], c->value_int );
+ Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
+ c->log, c->cr_msg, 0 );
+ rc = 1;
+ break;
+ }
+ lc->lc_max_depth = c->value_int;
+
+ case CH_RETURN_ERR:
+ if ( c->value_int ) {
+ lc->lc_flags |= LDAP_CHAIN_F_RETURN_ERR;
+ } else {
+ lc->lc_flags &= ~LDAP_CHAIN_F_RETURN_ERR;
+ }
+ break;
+
+ default:
+ assert( 0 );
+ return 1;
+ }
+ return rc;
+}
+
+static int
+ldap_chain_db_init(
+ BackendDB *be,
+ ConfigReply *cr )
+{
+ slap_overinst *on = (slap_overinst *)be->bd_info;
+ ldap_chain_t *lc = NULL;
+
+ if ( lback == NULL ) {
+ lback = backend_info( "ldap" );
+
+ if ( lback == NULL ) {
+ return 1;
+ }
+ }
+
+ lc = ch_malloc( sizeof( ldap_chain_t ) );
+ if ( lc == NULL ) {
+ return 1;
+ }
+ memset( lc, 0, sizeof( ldap_chain_t ) );
+ lc->lc_max_depth = 1;
+ ldap_pvt_thread_mutex_init( &lc->lc_lai.lai_mutex );
+
+ on->on_bi.bi_private = (void *)lc;
+
+ return 0;
+}
+
+static int
+ldap_chain_db_config(
+ BackendDB *be,
+ const char *fname,
+ int lineno,
+ int argc,
+ char **argv )
+{
+ slap_overinst *on = (slap_overinst *)be->bd_info;
+ ldap_chain_t *lc = (ldap_chain_t *)on->on_bi.bi_private;
+
+ int rc = SLAP_CONF_UNKNOWN;
+
+ if ( lc->lc_common_li == NULL ) {
+ BackendDB db = *be;
+ ldap_chain_db_init_common( &db );
+ lc->lc_common_li = lc->lc_cfg_li = (ldapinfo_t *)db.be_private;
+ }
+
+ /* Something for the chain database? */
+ if ( strncasecmp( argv[ 0 ], "chain-", STRLENOF( "chain-" ) ) == 0 ) {
+ char *save_argv0 = argv[ 0 ];
+ BackendDB db = *be;
+ static char *allowed_argv[] = {
+ /* special: put URI here, so in the meanwhile
+ * it detects whether a new URI is being provided */
+ "uri",
+ "nretries",
+ "timeout",
+ /* flags */
+ "tls",
+ /* FIXME: maybe rebind-as-user should be allowed
+ * only within known URIs... */
+ "rebind-as-user",
+ "chase-referrals",
+ "t-f-support",
+ "proxy-whoami",
+ NULL
+ };
+ int which_argv = -1;
+
+ argv[ 0 ] += STRLENOF( "chain-" );
+
+ for ( which_argv = 0; allowed_argv[ which_argv ]; which_argv++ ) {
+ if ( strcasecmp( argv[ 0 ], allowed_argv[ which_argv ] ) == 0 ) {
+ break;
+ }
+ }
+
+ if ( allowed_argv[ which_argv ] == NULL ) {
+ which_argv = -1;
+
+ if ( lc->lc_cfg_li == lc->lc_common_li ) {
+ Debug( LDAP_DEBUG_ANY, "%s: line %d: "
+ "\"%s\" only allowed within a URI directive.\n.",
+ fname, lineno, argv[ 0 ] );
+ return 1;
+ }
+ }
+
+ if ( which_argv == 0 ) {
+ rc = ldap_chain_db_init_one( &db );
+ if ( rc != 0 ) {
+ Debug( LDAP_DEBUG_ANY, "%s: line %d: "
+ "underlying slapd-ldap initialization failed.\n.",
+ fname, lineno, 0 );
+ return 1;
+ }
+ lc->lc_cfg_li = db.be_private;
+ }
+
+ /* TODO: add checks on what other slapd-ldap(5) args
+ * should be put in the template; this is not quite
+ * harmful, because attributes that shouldn't don't
+ * get actually used, but the user should at least
+ * be warned.
+ */
+
+ db.bd_info = lback;
+ db.be_private = (void *)lc->lc_cfg_li;
+ db.be_cf_ocs = lback->bi_cf_ocs;
+
+ rc = config_generic_wrapper( &db, fname, lineno, argc, argv );
+
+ argv[ 0 ] = save_argv0;
+
+ if ( which_argv == 0 ) {
+private_destroy:;
+ if ( rc != 0 ) {
+ db.bd_info = lback;
+ db.be_private = (void *)lc->lc_cfg_li;
+ ldap_chain_db_destroy_one( &db, NULL );
+ lc->lc_cfg_li = NULL;
+ } else {
+ if ( lc->lc_cfg_li->li_bvuri == NULL
+ || BER_BVISNULL( &lc->lc_cfg_li->li_bvuri[ 0 ] )
+ || !BER_BVISNULL( &lc->lc_cfg_li->li_bvuri[ 1 ] ) )
+ {
+ Debug( LDAP_DEBUG_ANY, "%s: line %d: "
+ "no URI list allowed in slapo-chain.\n",
+ fname, lineno, 0 );
+ rc = 1;
+ goto private_destroy;
+ }
+
+ if ( avl_insert( &lc->lc_lai.lai_tree,
+ (caddr_t)lc->lc_cfg_li,
+ ldap_chain_uri_cmp, ldap_chain_uri_dup ) )
+ {
+ Debug( LDAP_DEBUG_ANY, "%s: line %d: "
+ "duplicate URI in slapo-chain.\n",
+ fname, lineno, 0 );
+ rc = 1;
+ goto private_destroy;
+ }
+ }
+ }
+ }
+
+ return rc;
+}
+
+enum db_which {
+ db_open = 0,
+ db_close,
+ db_destroy,
+
+ db_last
+};
+
+typedef struct ldap_chain_db_apply_t {
+ BackendDB *be;
+ BI_db_func *func;
+} ldap_chain_db_apply_t;
+
+static int
+ldap_chain_db_apply( void *datum, void *arg )
+{
+ ldapinfo_t *li = (ldapinfo_t *)datum;
+ ldap_chain_db_apply_t *lca = (ldap_chain_db_apply_t *)arg;
+
+ lca->be->be_private = (void *)li;
+
+ return lca->func( lca->be, NULL );
+}
+
+static int
+ldap_chain_db_func(
+ BackendDB *be,
+ enum db_which which
+)
+{
+ slap_overinst *on = (slap_overinst *)be->bd_info;
+ ldap_chain_t *lc = (ldap_chain_t *)on->on_bi.bi_private;
+
+ int rc = 0;
+
+ if ( lc ) {
+ BI_db_func *func = (&lback->bi_db_open)[ which ];
+
+ if ( func != NULL && lc->lc_common_li != NULL ) {
+ BackendDB db = *be;
+
+ db.bd_info = lback;
+ db.be_private = lc->lc_common_li;
+
+ rc = func( &db, NULL );
+
+ if ( rc != 0 ) {
+ return rc;
+ }
+
+ if ( lc->lc_lai.lai_tree != NULL ) {
+ ldap_chain_db_apply_t lca;
+
+ lca.be = &db;
+ lca.func = func;
+
+ rc = avl_apply( lc->lc_lai.lai_tree,
+ ldap_chain_db_apply, (void *)&lca,
+ 1, AVL_INORDER ) != AVL_NOMORE;
+ }
+ }
+ }
+
+ return rc;
+}
+
+static int
+ldap_chain_db_open(
+ BackendDB *be,
+ ConfigReply *cr )
+{
+ slap_overinst *on = (slap_overinst *) be->bd_info;
+ ldap_chain_t *lc = (ldap_chain_t *)on->on_bi.bi_private;
+ slap_mask_t monitoring;
+ int rc = 0;
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ rc = overlay_register_control( be, LDAP_CONTROL_X_CHAINING_BEHAVIOR );
+ if ( rc != 0 ) {
+ return rc;
+ }
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+
+ if ( lc->lc_common_li == NULL ) {
+ void *be_private = be->be_private;
+ ldap_chain_db_init_common( be );
+ lc->lc_common_li = lc->lc_cfg_li = (ldapinfo_t *)be->be_private;
+ be->be_private = be_private;
+ }
+
+ /* filter out and restore monitoring */
+ monitoring = ( SLAP_DBFLAGS( be ) & SLAP_DBFLAG_MONITORING );
+ SLAP_DBFLAGS( be ) &= ~SLAP_DBFLAG_MONITORING;
+ rc = ldap_chain_db_func( be, db_open );
+ SLAP_DBFLAGS( be ) |= monitoring;
+
+ return rc;
+}
+
+static int
+ldap_chain_db_close(
+ BackendDB *be,
+ ConfigReply *cr )
+{
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+#ifdef SLAP_CONFIG_DELETE
+ overlay_unregister_control( be, LDAP_CONTROL_X_CHAINING_BEHAVIOR );
+#endif /* SLAP_CONFIG_DELETE */
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+ return ldap_chain_db_func( be, db_close );
+}
+
+static int
+ldap_chain_db_destroy(
+ BackendDB *be,
+ ConfigReply *cr )
+{
+ slap_overinst *on = (slap_overinst *) be->bd_info;
+ ldap_chain_t *lc = (ldap_chain_t *)on->on_bi.bi_private;
+
+ int rc;
+
+ rc = ldap_chain_db_func( be, db_destroy );
+
+ if ( lc ) {
+ avl_free( lc->lc_lai.lai_tree, NULL );
+ ldap_pvt_thread_mutex_destroy( &lc->lc_lai.lai_mutex );
+ ch_free( lc );
+ }
+
+ return rc;
+}
+
+/*
+ * inits one instance of the slapd-ldap backend, and stores
+ * the private info in be_private of the arg
+ */
+static int
+ldap_chain_db_init_common(
+ BackendDB *be )
+{
+ BackendInfo *bi = be->bd_info;
+ ldapinfo_t *li;
+ int rc;
+
+ be->bd_info = lback;
+ be->be_private = NULL;
+ rc = lback->bi_db_init( be, NULL );
+ if ( rc != 0 ) {
+ return rc;
+ }
+ li = (ldapinfo_t *)be->be_private;
+ li->li_urllist_f = NULL;
+ li->li_urllist_p = NULL;
+
+ be->bd_info = bi;
+
+ return 0;
+}
+
+/*
+ * inits one instance of the slapd-ldap backend, stores
+ * the private info in be_private of the arg and fills
+ * selected fields with data from the template.
+ *
+ * NOTE: add checks about the other fields of the template,
+ * which are ignored and SHOULD NOT be configured by the user.
+ */
+static int
+ldap_chain_db_init_one(
+ BackendDB *be )
+{
+ slap_overinst *on = (slap_overinst *)be->bd_info;
+ ldap_chain_t *lc = (ldap_chain_t *)on->on_bi.bi_private;
+
+ BackendInfo *bi = be->bd_info;
+ ldapinfo_t *li;
+
+ slap_op_t t;
+
+ be->bd_info = lback;
+ be->be_private = NULL;
+ t = lback->bi_db_init( be, NULL );
+ if ( t != 0 ) {
+ return t;
+ }
+ li = (ldapinfo_t *)be->be_private;
+ li->li_urllist_f = NULL;
+ li->li_urllist_p = NULL;
+
+ /* copy common data */
+ li->li_nretries = lc->lc_common_li->li_nretries;
+ li->li_flags = lc->lc_common_li->li_flags;
+ li->li_version = lc->lc_common_li->li_version;
+ for ( t = 0; t < SLAP_OP_LAST; t++ ) {
+ li->li_timeout[ t ] = lc->lc_common_li->li_timeout[ t ];
+ }
+ be->bd_info = bi;
+
+ return 0;
+}
+
+static int
+ldap_chain_db_open_one(
+ BackendDB *be )
+{
+ if ( SLAP_DBMONITORING( be ) ) {
+ ldapinfo_t *li = (ldapinfo_t *)be->be_private;
+
+ if ( li->li_uri == NULL ) {
+ ber_str2bv( "cn=Common Connections", 0, 1,
+ &li->li_monitor_info.lmi_conn_rdn );
+ ber_str2bv( "cn=Operations on Common Connections", 0, 1,
+ &li->li_monitor_info.lmi_conn_rdn );
+
+ } else {
+ char *ptr;
+
+ li->li_monitor_info.lmi_conn_rdn.bv_len
+ = STRLENOF( "cn=" ) + strlen( li->li_uri );
+ ptr = li->li_monitor_info.lmi_conn_rdn.bv_val
+ = ch_malloc( li->li_monitor_info.lmi_conn_rdn.bv_len + 1 );
+ ptr = lutil_strcopy( ptr, "cn=" );
+ ptr = lutil_strcopy( ptr, li->li_uri );
+ ptr[ 0 ] = '\0';
+
+ li->li_monitor_info.lmi_ops_rdn.bv_len
+ = STRLENOF( "cn=Operations on " ) + strlen( li->li_uri );
+ ptr = li->li_monitor_info.lmi_ops_rdn.bv_val
+ = ch_malloc( li->li_monitor_info.lmi_ops_rdn.bv_len + 1 );
+ ptr = lutil_strcopy( ptr, "cn=Operations on " );
+ ptr = lutil_strcopy( ptr, li->li_uri );
+ ptr[ 0 ] = '\0';
+ }
+ }
+
+ return lback->bi_db_open( be, NULL );
+}
+
+typedef struct ldap_chain_conn_apply_t {
+ BackendDB *be;
+ Connection *conn;
+} ldap_chain_conn_apply_t;
+
+static int
+ldap_chain_conn_apply( void *datum, void *arg )
+{
+ ldapinfo_t *li = (ldapinfo_t *)datum;
+ ldap_chain_conn_apply_t *lca = (ldap_chain_conn_apply_t *)arg;
+
+ lca->be->be_private = (void *)li;
+
+ return lback->bi_connection_destroy( lca->be, lca->conn );
+}
+
+static int
+ldap_chain_connection_destroy(
+ BackendDB *be,
+ Connection *conn
+)
+{
+ slap_overinst *on = (slap_overinst *) be->bd_info;
+ ldap_chain_t *lc = (ldap_chain_t *)on->on_bi.bi_private;
+ void *private = be->be_private;
+ ldap_chain_conn_apply_t lca;
+ int rc;
+
+ be->be_private = NULL;
+ lca.be = be;
+ lca.conn = conn;
+ ldap_pvt_thread_mutex_lock( &lc->lc_lai.lai_mutex );
+ rc = avl_apply( lc->lc_lai.lai_tree, ldap_chain_conn_apply,
+ (void *)&lca, 1, AVL_INORDER ) != AVL_NOMORE;
+ ldap_pvt_thread_mutex_unlock( &lc->lc_lai.lai_mutex );
+ be->be_private = private;
+
+ return rc;
+}
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+static int
+ldap_chain_parse_ctrl(
+ Operation *op,
+ SlapReply *rs,
+ LDAPControl *ctrl )
+{
+ ber_tag_t tag;
+ BerElement *ber;
+ ber_int_t mode,
+ behavior;
+
+ if ( get_chaining( op ) != SLAP_CONTROL_NONE ) {
+ rs->sr_text = "Chaining behavior control specified multiple times";
+ return LDAP_PROTOCOL_ERROR;
+ }
+
+ if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
+ rs->sr_text = "Chaining behavior control specified with pagedResults control";
+ return LDAP_PROTOCOL_ERROR;
+ }
+
+ if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
+ mode = (SLAP_CH_RESOLVE_DEFAULT|SLAP_CH_CONTINUATION_DEFAULT);
+
+ } else {
+ ber_len_t len;
+
+ /* Parse the control value
+ * ChainingBehavior ::= SEQUENCE {
+ * resolveBehavior Behavior OPTIONAL,
+ * continuationBehavior Behavior OPTIONAL }
+ *
+ * Behavior :: = ENUMERATED {
+ * chainingPreferred (0),
+ * chainingRequired (1),
+ * referralsPreferred (2),
+ * referralsRequired (3) }
+ */
+
+ ber = ber_init( &ctrl->ldctl_value );
+ if( ber == NULL ) {
+ rs->sr_text = "internal error";
+ return LDAP_OTHER;
+ }
+
+ tag = ber_scanf( ber, "{e" /* } */, &behavior );
+ /* FIXME: since the whole SEQUENCE is optional,
+ * should we accept no enumerations at all? */
+ if ( tag != LBER_ENUMERATED ) {
+ rs->sr_text = "Chaining behavior control: resolveBehavior decoding error";
+ return LDAP_PROTOCOL_ERROR;
+ }
+
+ switch ( behavior ) {
+ case LDAP_CHAINING_PREFERRED:
+ mode = SLAP_CH_RESOLVE_CHAINING_PREFERRED;
+ break;
+
+ case LDAP_CHAINING_REQUIRED:
+ mode = SLAP_CH_RESOLVE_CHAINING_REQUIRED;
+ break;
+
+ case LDAP_REFERRALS_PREFERRED:
+ mode = SLAP_CH_RESOLVE_REFERRALS_PREFERRED;
+ break;
+
+ case LDAP_REFERRALS_REQUIRED:
+ mode = SLAP_CH_RESOLVE_REFERRALS_REQUIRED;
+ break;
+
+ default:
+ rs->sr_text = "Chaining behavior control: unknown resolveBehavior";
+ return LDAP_PROTOCOL_ERROR;
+ }
+
+ tag = ber_peek_tag( ber, &len );
+ if ( tag == LBER_ENUMERATED ) {
+ tag = ber_scanf( ber, "e", &behavior );
+ if ( tag == LBER_ERROR ) {
+ rs->sr_text = "Chaining behavior control: continuationBehavior decoding error";
+ return LDAP_PROTOCOL_ERROR;
+ }
+ }
+
+ if ( tag == LBER_DEFAULT ) {
+ mode |= SLAP_CH_CONTINUATION_DEFAULT;
+
+ } else {
+ switch ( behavior ) {
+ case LDAP_CHAINING_PREFERRED:
+ mode |= SLAP_CH_CONTINUATION_CHAINING_PREFERRED;
+ break;
+
+ case LDAP_CHAINING_REQUIRED:
+ mode |= SLAP_CH_CONTINUATION_CHAINING_REQUIRED;
+ break;
+
+ case LDAP_REFERRALS_PREFERRED:
+ mode |= SLAP_CH_CONTINUATION_REFERRALS_PREFERRED;
+ break;
+
+ case LDAP_REFERRALS_REQUIRED:
+ mode |= SLAP_CH_CONTINUATION_REFERRALS_REQUIRED;
+ break;
+
+ default:
+ rs->sr_text = "Chaining behavior control: unknown continuationBehavior";
+ return LDAP_PROTOCOL_ERROR;
+ }
+ }
+
+ if ( ( ber_scanf( ber, /* { */ "}") ) == LBER_ERROR ) {
+ rs->sr_text = "Chaining behavior control: decoding error";
+ return LDAP_PROTOCOL_ERROR;
+ }
+
+ (void) ber_free( ber, 1 );
+ }
+
+ op->o_chaining = mode | ( ctrl->ldctl_iscritical
+ ? SLAP_CONTROL_CRITICAL
+ : SLAP_CONTROL_NONCRITICAL );
+
+ return LDAP_SUCCESS;
+}
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+
+int
+chain_initialize( void )
+{
+ int rc;
+
+ /* Make sure we don't exceed the bits reserved for userland */
+ config_check_userland( CH_LAST );
+
+ /* olcDatabaseDummy is defined in slapd, and Windows
+ will not let us initialize a struct element with a data pointer
+ from another library, so we have to initialize this element
+ "by hand". */
+ chainocs[1].co_table = olcDatabaseDummy;
+
+#ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
+ rc = register_supported_control( LDAP_CONTROL_X_CHAINING_BEHAVIOR,
+ /* SLAP_CTRL_GLOBAL| */ SLAP_CTRL_ACCESS|SLAP_CTRL_HIDE, NULL,
+ ldap_chain_parse_ctrl, &sc_chainingBehavior );
+ if ( rc != LDAP_SUCCESS ) {
+ Debug( LDAP_DEBUG_ANY, "slapd-chain: "
+ "unable to register chaining behavior control: %d.\n",
+ rc, 0, 0 );
+ return rc;
+ }
+#endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
+
+ ldapchain.on_bi.bi_type = "chain";
+ ldapchain.on_bi.bi_db_init = ldap_chain_db_init;
+ ldapchain.on_bi.bi_db_config = ldap_chain_db_config;
+ ldapchain.on_bi.bi_db_open = ldap_chain_db_open;
+ ldapchain.on_bi.bi_db_close = ldap_chain_db_close;
+ ldapchain.on_bi.bi_db_destroy = ldap_chain_db_destroy;
+
+ ldapchain.on_bi.bi_connection_destroy = ldap_chain_connection_destroy;
+
+ ldapchain.on_response = ldap_chain_response;
+
+ ldapchain.on_bi.bi_cf_ocs = chainocs;
+
+ rc = config_register_schema( chaincfg, chainocs );
+ if ( rc ) {
+ return rc;
+ }
+
+ return overlay_register( &ldapchain );
+}
+