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-rw-r--r--servers/slapd/overlays/deref.c586
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diff --git a/servers/slapd/overlays/deref.c b/servers/slapd/overlays/deref.c
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+++ b/servers/slapd/overlays/deref.c
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+/* deref.c - dereference overlay */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2022 The OpenLDAP Foundation.
+ * Portions Copyright 2008 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"
+
+#ifdef SLAPD_OVER_DEREF
+
+#include <stdio.h>
+
+#include "ac/string.h"
+#include "ac/socket.h"
+
+#include "slap.h"
+#include "slap-config.h"
+
+#include "lutil.h"
+
+/*
+ * 1. Specification
+ *
+ * 1.1. Request
+ *
+ * controlValue ::= SEQUENCE OF derefSpec DerefSpec
+ *
+ * DerefSpec ::= SEQUENCE {
+ * derefAttr attributeDescription, ; DN-valued
+ * attributes AttributeList }
+ *
+ * AttributeList ::= SEQUENCE OF attr AttributeDescription
+ *
+ * derefAttr MUST be unique within controlValue
+ *
+ *
+ * 1.2. Response
+ *
+ * controlValue ::= SEQUENCE OF DerefRes
+ *
+ * From RFC 4511:
+ * PartialAttribute ::= SEQUENCE {
+ * type AttributeDescription,
+ * vals SET OF value AttributeValue }
+ *
+ * PartialAttributeList ::= SEQUENCE OF
+ * partialAttribute PartialAttribute
+ *
+ * DerefRes ::= SEQUENCE {
+ * derefAttr AttributeDescription,
+ * derefVal LDAPDN,
+ * attrVals [0] PartialAttributeList OPTIONAL }
+ *
+ * If vals is empty, partialAttribute is omitted.
+ * If all vals in attrVals are empty, attrVals is omitted.
+ *
+ * 2. Examples
+ *
+ * 2.1. Example
+ *
+ * 2.1.1. Request
+ *
+ * { { member, { GUID, SID } }, { memberOf, { GUID, SID } } }
+ *
+ * 2.1.2. Response
+ *
+ * { { memberOf, "cn=abartlet,cn=users,dc=abartlet,dc=net",
+ * { { GUID, [ "0bc11d00-e431-40a0-8767-344a320142fa" ] },
+ * { SID, [ "S-1-2-3-2345" ] } } },
+ * { memberOf, "cn=ando,cn=users,dc=sys-net,dc=it",
+ * { { GUID, [ "0bc11d00-e431-40a0-8767-344a320142fb" ] },
+ * { SID, [ "S-1-2-3-2346" ] } } } }
+ *
+ * 2.2. Example
+ *
+ * 2.2.1. Request
+ *
+ * { { member, { cn, uid, drink } } }
+ *
+ * 2.2.2. Response
+ *
+ * { { member, "cn=ando,cn=users,dc=sys-net,dc=it",
+ * { { cn, [ "ando", "Pierangelo Masarati" ] },
+ * { uid, [ "ando" ] } } },
+ * { member, "dc=sys-net,dc=it" } }
+ *
+ *
+ * 3. Security considerations
+ *
+ * The control result must not disclose information the client's
+ * identity could not have accessed directly by performing the related
+ * search operations. The presence of a derefVal in the control
+ * response does not imply neither the existence of nor any access
+ * privilege to the corresponding entry. It is merely a consequence
+ * of the read access the client's identity has on the corresponding
+ * attribute's value.
+ */
+
+#define o_deref o_ctrlflag[deref_cid]
+#define o_ctrlderef o_controls[deref_cid]
+
+typedef struct DerefSpec {
+ AttributeDescription *ds_derefAttr;
+ AttributeDescription **ds_attributes;
+ int ds_nattrs;
+ struct DerefSpec *ds_next;
+} DerefSpec;
+
+typedef struct DerefVal {
+ struct berval dv_derefSpecVal;
+ BerVarray *dv_attrVals;
+} DerefVal;
+
+typedef struct DerefRes {
+ DerefSpec dr_spec;
+ DerefVal *dr_vals;
+ struct DerefRes *dr_next;
+} DerefRes;
+
+typedef struct deref_cb_t {
+ slap_overinst *dc_on;
+ DerefSpec *dc_ds;
+} deref_cb_t;
+
+static int deref_cid;
+static slap_overinst deref;
+static int ov_count;
+
+static int
+deref_parseCtrl (
+ Operation *op,
+ SlapReply *rs,
+ LDAPControl *ctrl )
+{
+ ber_tag_t tag;
+ BerElementBuffer berbuf;
+ BerElement *ber = (BerElement *)&berbuf;
+ ber_len_t len;
+ char *last;
+ DerefSpec *dshead = NULL, **dsp = &dshead;
+ BerVarray attributes = NULL;
+
+ if ( op->o_deref != SLAP_CONTROL_NONE ) {
+ rs->sr_text = "Dereference control specified multiple times";
+ return LDAP_PROTOCOL_ERROR;
+ }
+
+ if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
+ rs->sr_text = "Dereference control value is absent";
+ return LDAP_PROTOCOL_ERROR;
+ }
+
+ if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
+ rs->sr_text = "Dereference control value is empty";
+ return LDAP_PROTOCOL_ERROR;
+ }
+
+ ber_init2( ber, &ctrl->ldctl_value, 0 );
+
+ for ( tag = ber_first_element( ber, &len, &last );
+ tag != LBER_DEFAULT;
+ tag = ber_next_element( ber, &len, last ) )
+ {
+ struct berval derefAttr;
+ DerefSpec *ds, *dstmp;
+ const char *text;
+ int rc;
+ ber_len_t cnt = sizeof(struct berval);
+ ber_len_t off = 0;
+
+ if ( ber_scanf( ber, "{m{M}}", &derefAttr, &attributes, &cnt, off ) == LBER_ERROR
+ || !cnt )
+ {
+ rs->sr_text = "Dereference control: derefSpec decoding error";
+ rs->sr_err = LDAP_PROTOCOL_ERROR;
+ goto done;
+ }
+
+ ds = (DerefSpec *)op->o_tmpcalloc( 1,
+ sizeof(DerefSpec) + sizeof(AttributeDescription *)*(cnt + 1),
+ op->o_tmpmemctx );
+ ds->ds_attributes = (AttributeDescription **)&ds[ 1 ];
+ ds->ds_nattrs = cnt;
+
+ rc = slap_bv2ad( &derefAttr, &ds->ds_derefAttr, &text );
+ if ( rc != LDAP_SUCCESS ) {
+ rs->sr_text = "Dereference control: derefAttr decoding error";
+ rs->sr_err = LDAP_PROTOCOL_ERROR;
+ goto done;
+ }
+
+ for ( dstmp = dshead; dstmp && dstmp != ds; dstmp = dstmp->ds_next ) {
+ if ( dstmp->ds_derefAttr == ds->ds_derefAttr ) {
+ rs->sr_text = "Dereference control: derefAttr must be unique within control";
+ rs->sr_err = LDAP_PROTOCOL_ERROR;
+ goto done;
+ }
+ }
+
+ if ( !( ds->ds_derefAttr->ad_type->sat_syntax->ssyn_flags & SLAP_SYNTAX_DN )) {
+ if ( ctrl->ldctl_iscritical ) {
+ rs->sr_text = "Dereference control: derefAttr syntax not distinguishedName";
+ rs->sr_err = LDAP_PROTOCOL_ERROR;
+ goto done;
+ }
+
+ rs->sr_err = LDAP_SUCCESS;
+ goto justcleanup;
+ }
+
+ for ( cnt = 0; !BER_BVISNULL( &attributes[ cnt ] ); cnt++ ) {
+ rc = slap_bv2ad( &attributes[ cnt ], &ds->ds_attributes[ cnt ], &text );
+ if ( rc != LDAP_SUCCESS ) {
+ rs->sr_text = "Dereference control: attribute decoding error";
+ rs->sr_err = LDAP_PROTOCOL_ERROR;
+ goto done;
+ }
+ }
+
+ ber_memfree_x( attributes, op->o_tmpmemctx );
+ attributes = NULL;
+
+ *dsp = ds;
+ dsp = &ds->ds_next;
+ }
+
+ op->o_ctrlderef = (void *)dshead;
+
+ op->o_deref = ctrl->ldctl_iscritical
+ ? SLAP_CONTROL_CRITICAL
+ : SLAP_CONTROL_NONCRITICAL;
+
+ rs->sr_err = LDAP_SUCCESS;
+
+done:;
+ if ( rs->sr_err != LDAP_SUCCESS ) {
+justcleanup:;
+ for ( ; dshead; ) {
+ DerefSpec *dsnext = dshead->ds_next;
+ op->o_tmpfree( dshead, op->o_tmpmemctx );
+ dshead = dsnext;
+ }
+ }
+
+ if ( attributes != NULL ) {
+ ber_memfree_x( attributes, op->o_tmpmemctx );
+ }
+
+ return rs->sr_err;
+}
+
+static int
+deref_cleanup( Operation *op, SlapReply *rs )
+{
+ if ( rs->sr_type == REP_RESULT || rs->sr_err == SLAPD_ABANDON ) {
+ op->o_tmpfree( op->o_callback, op->o_tmpmemctx );
+ op->o_callback = NULL;
+
+ op->o_tmpfree( op->o_ctrlderef, op->o_tmpmemctx );
+ op->o_ctrlderef = NULL;
+ }
+
+ return SLAP_CB_CONTINUE;
+}
+
+static int
+deref_response( Operation *op, SlapReply *rs )
+{
+ int rc = SLAP_CB_CONTINUE;
+
+ if ( rs->sr_type == REP_SEARCH ) {
+ BerElementBuffer berbuf;
+ BerElement *ber = (BerElement *) &berbuf;
+ deref_cb_t *dc = (deref_cb_t *)op->o_callback->sc_private;
+ DerefSpec *ds;
+ DerefRes *dr, *drhead = NULL, **drp = &drhead;
+ struct berval bv = BER_BVNULL;
+ int nDerefRes = 0, nDerefVals = 0, nAttrs = 0, nVals = 0;
+ struct berval ctrlval;
+ LDAPControl *ctrl, *ctrlsp[2];
+ AccessControlState acl_state = ACL_STATE_INIT;
+ static char dummy = '\0';
+ Entry *ebase;
+ int i;
+
+ rc = overlay_entry_get_ov( op, &rs->sr_entry->e_nname, NULL, NULL, 0, &ebase, dc->dc_on );
+ if ( rc != LDAP_SUCCESS || ebase == NULL ) {
+ return SLAP_CB_CONTINUE;
+ }
+
+ for ( ds = dc->dc_ds; ds; ds = ds->ds_next ) {
+ Attribute *a = attr_find( ebase->e_attrs, ds->ds_derefAttr );
+
+ if ( a != NULL ) {
+ DerefVal *dv;
+ BerVarray *bva;
+
+ if ( !access_allowed( op, rs->sr_entry, a->a_desc,
+ NULL, ACL_READ, &acl_state ) )
+ {
+ continue;
+ }
+
+ dr = op->o_tmpcalloc( 1,
+ sizeof( DerefRes ) + ( sizeof( DerefVal ) + sizeof( BerVarray * ) * ds->ds_nattrs ) * ( a->a_numvals + 1 ),
+ op->o_tmpmemctx );
+ dr->dr_spec = *ds;
+ dv = dr->dr_vals = (DerefVal *)&dr[ 1 ];
+ bva = (BerVarray *)&dv[ a->a_numvals + 1 ];
+
+ bv.bv_len += ds->ds_derefAttr->ad_cname.bv_len;
+ nAttrs++;
+ nDerefRes++;
+
+ for ( i = 0; !BER_BVISNULL( &a->a_nvals[ i ] ); i++ ) {
+ Entry *e = NULL;
+
+ dv[ i ].dv_attrVals = bva;
+ bva += ds->ds_nattrs;
+
+
+ if ( !access_allowed( op, rs->sr_entry, a->a_desc,
+ &a->a_nvals[ i ], ACL_READ, &acl_state ) )
+ {
+ dv[ i ].dv_derefSpecVal.bv_val = &dummy;
+ continue;
+ }
+
+ ber_dupbv_x( &dv[ i ].dv_derefSpecVal, &a->a_vals[ i ], op->o_tmpmemctx );
+ bv.bv_len += dv[ i ].dv_derefSpecVal.bv_len;
+ nVals++;
+ nDerefVals++;
+
+ rc = overlay_entry_get_ov( op, &a->a_nvals[ i ], NULL, NULL, 0, &e, dc->dc_on );
+ if ( rc == LDAP_SUCCESS && e != NULL ) {
+ int j;
+
+ if ( access_allowed( op, e, slap_schema.si_ad_entry,
+ NULL, ACL_READ, NULL ) )
+ {
+ for ( j = 0; j < ds->ds_nattrs; j++ ) {
+ Attribute *aa;
+
+ if ( !access_allowed( op, e, ds->ds_attributes[ j ], NULL,
+ ACL_READ, &acl_state ) )
+ {
+ continue;
+ }
+
+ aa = attr_find( e->e_attrs, ds->ds_attributes[ j ] );
+ if ( aa != NULL ) {
+ unsigned k, h, last = aa->a_numvals;
+
+ ber_bvarray_dup_x( &dv[ i ].dv_attrVals[ j ],
+ aa->a_vals, op->o_tmpmemctx );
+
+ bv.bv_len += ds->ds_attributes[ j ]->ad_cname.bv_len;
+
+ for ( k = 0, h = 0; k < aa->a_numvals; k++ ) {
+ if ( !access_allowed( op, e,
+ aa->a_desc,
+ &aa->a_nvals[ k ],
+ ACL_READ, &acl_state ) )
+ {
+ op->o_tmpfree( dv[ i ].dv_attrVals[ j ][ h ].bv_val,
+ op->o_tmpmemctx );
+ dv[ i ].dv_attrVals[ j ][ h ] = dv[ i ].dv_attrVals[ j ][ --last ];
+ BER_BVZERO( &dv[ i ].dv_attrVals[ j ][ last ] );
+ continue;
+ }
+ bv.bv_len += dv[ i ].dv_attrVals[ j ][ h ].bv_len;
+ nVals++;
+ h++;
+ }
+ nAttrs++;
+ }
+ }
+ }
+
+ overlay_entry_release_ov( op, e, 0, dc->dc_on );
+ }
+ }
+
+ *drp = dr;
+ drp = &dr->dr_next;
+ }
+ }
+ overlay_entry_release_ov( op, ebase, 0, dc->dc_on );
+
+ if ( drhead == NULL ) {
+ return SLAP_CB_CONTINUE;
+ }
+
+ /* cook the control value */
+ bv.bv_len += nVals * sizeof(struct berval)
+ + nAttrs * sizeof(struct berval)
+ + nDerefVals * sizeof(DerefVal)
+ + nDerefRes * sizeof(DerefRes);
+ bv.bv_val = op->o_tmpalloc( bv.bv_len, op->o_tmpmemctx );
+
+ ber_init2( ber, &bv, LBER_USE_DER );
+ ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
+
+ rc = ber_printf( ber, "{" /*}*/ );
+ for ( dr = drhead; dr != NULL; dr = dr->dr_next ) {
+ for ( i = 0; !BER_BVISNULL( &dr->dr_vals[ i ].dv_derefSpecVal ); i++ ) {
+ int j, first = 1;
+
+ if ( dr->dr_vals[ i ].dv_derefSpecVal.bv_val == &dummy ) {
+ continue;
+ }
+
+ rc = ber_printf( ber, "{OO" /*}*/,
+ &dr->dr_spec.ds_derefAttr->ad_cname,
+ &dr->dr_vals[ i ].dv_derefSpecVal );
+ op->o_tmpfree( dr->dr_vals[ i ].dv_derefSpecVal.bv_val, op->o_tmpmemctx );
+ for ( j = 0; j < dr->dr_spec.ds_nattrs; j++ ) {
+ if ( dr->dr_vals[ i ].dv_attrVals[ j ] != NULL ) {
+ if ( first ) {
+ rc = ber_printf( ber, "t{" /*}*/,
+ (LBER_CONSTRUCTED|LBER_CLASS_CONTEXT) );
+ first = 0;
+ }
+ rc = ber_printf( ber, "{O[W]}",
+ &dr->dr_spec.ds_attributes[ j ]->ad_cname,
+ dr->dr_vals[ i ].dv_attrVals[ j ] );
+ op->o_tmpfree( dr->dr_vals[ i ].dv_attrVals[ j ],
+ op->o_tmpmemctx );
+ }
+ }
+ if ( !first ) {
+ rc = ber_printf( ber, /*{{*/ "}N}" );
+ } else {
+ rc = ber_printf( ber, /*{*/ "}" );
+ }
+ }
+ }
+ rc = ber_printf( ber, /*{*/ "}" );
+ if ( ber_flatten2( ber, &ctrlval, 0 ) == -1 ) {
+ if ( op->o_deref == SLAP_CONTROL_CRITICAL ) {
+ rc = LDAP_CONSTRAINT_VIOLATION;
+
+ } else {
+ rc = SLAP_CB_CONTINUE;
+ }
+ goto cleanup;
+ }
+
+ ctrl = op->o_tmpcalloc( 1,
+ sizeof( LDAPControl ) + ctrlval.bv_len + 1,
+ op->o_tmpmemctx );
+ ctrl->ldctl_value.bv_val = (char *)&ctrl[ 1 ];
+ ctrl->ldctl_oid = LDAP_CONTROL_X_DEREF;
+ ctrl->ldctl_iscritical = 0;
+ ctrl->ldctl_value.bv_len = ctrlval.bv_len;
+ AC_MEMCPY( ctrl->ldctl_value.bv_val, ctrlval.bv_val, ctrlval.bv_len );
+ ctrl->ldctl_value.bv_val[ ctrl->ldctl_value.bv_len ] = '\0';
+
+ ber_free_buf( ber );
+
+ ctrlsp[0] = ctrl;
+ ctrlsp[1] = NULL;
+ slap_add_ctrls( op, rs, ctrlsp );
+
+ rc = SLAP_CB_CONTINUE;
+
+cleanup:;
+ /* release all */
+ for ( ; drhead != NULL; ) {
+ DerefRes *drnext = drhead->dr_next;
+ op->o_tmpfree( drhead, op->o_tmpmemctx );
+ drhead = drnext;
+ }
+
+ } else if ( rs->sr_type == REP_RESULT ) {
+ rc = deref_cleanup( op, rs );
+ }
+
+ return rc;
+}
+
+static int
+deref_op_search( Operation *op, SlapReply *rs )
+{
+ if ( op->o_deref ) {
+ slap_callback *sc;
+ deref_cb_t *dc;
+
+ sc = op->o_tmpcalloc( 1, sizeof( slap_callback ) + sizeof( deref_cb_t ), op->o_tmpmemctx );
+
+ dc = (deref_cb_t *)&sc[ 1 ];
+ dc->dc_on = (slap_overinst *)op->o_bd->bd_info;
+ dc->dc_ds = (DerefSpec *)op->o_ctrlderef;
+
+ sc->sc_response = deref_response;
+ sc->sc_cleanup = deref_cleanup;
+ sc->sc_private = (void *)dc;
+
+ sc->sc_next = op->o_callback->sc_next;
+ op->o_callback->sc_next = sc;
+ }
+
+ return SLAP_CB_CONTINUE;
+}
+
+static int
+deref_db_init( BackendDB *be, ConfigReply *cr)
+{
+ if ( ov_count == 0 ) {
+ int rc;
+
+ rc = register_supported_control2( LDAP_CONTROL_X_DEREF,
+ SLAP_CTRL_SEARCH,
+ NULL,
+ deref_parseCtrl,
+ 1, /* replace */
+ &deref_cid );
+ if ( rc != LDAP_SUCCESS ) {
+ Debug( LDAP_DEBUG_ANY,
+ "deref_init: Failed to register control (%d)\n",
+ rc );
+ return rc;
+ }
+ }
+ ov_count++;
+ return LDAP_SUCCESS;
+}
+
+static int
+deref_db_open( BackendDB *be, ConfigReply *cr)
+{
+ return overlay_register_control( be, LDAP_CONTROL_X_DEREF );
+}
+
+#ifdef SLAP_CONFIG_DELETE
+static int
+deref_db_destroy( BackendDB *be, ConfigReply *cr)
+{
+ ov_count--;
+ overlay_unregister_control( be, LDAP_CONTROL_X_DEREF );
+ if ( ov_count == 0 ) {
+ unregister_supported_control( LDAP_CONTROL_X_DEREF );
+ }
+ return 0;
+}
+#endif /* SLAP_CONFIG_DELETE */
+
+int
+deref_initialize(void)
+{
+ deref.on_bi.bi_type = "deref";
+ deref.on_bi.bi_flags = SLAPO_BFLAG_SINGLE;
+ deref.on_bi.bi_db_init = deref_db_init;
+ deref.on_bi.bi_db_open = deref_db_open;
+#ifdef SLAP_CONFIG_DELETE
+ deref.on_bi.bi_db_destroy = deref_db_destroy;
+#endif /* SLAP_CONFIG_DELETE */
+ deref.on_bi.bi_op_search = deref_op_search;
+
+ return overlay_register( &deref );
+}
+
+#if SLAPD_OVER_DEREF == SLAPD_MOD_DYNAMIC
+int
+init_module( int argc, char *argv[] )
+{
+ return deref_initialize();
+}
+#endif /* SLAPD_OVER_DEREF == SLAPD_MOD_DYNAMIC */
+
+#endif /* SLAPD_OVER_DEREF */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 14:11:07 +0000