1/* delete.cpp - ndb backend delete routine */
2/* $OpenLDAP$ */
3/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4 *
5 * Copyright 2008-2021 The OpenLDAP Foundation.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted only as authorized by the OpenLDAP
10 * Public License.
11 *
12 * A copy of this license is available in the file LICENSE in the
13 * top-level directory of the distribution or, alternatively, at
14 * <http://www.OpenLDAP.org/license.html>.
15 */
16/* ACKNOWLEDGEMENTS:
17 * This work was initially developed by Howard Chu for inclusion
18 * in OpenLDAP Software. This work was sponsored by MySQL.
19 */
20
21#include "portable.h"
22
23#include <stdio.h>
24#include <ac/string.h>
25
26#include "lutil.h"
27#include "back-ndb.h"
28
29static struct berval glue_bv = BER_BVC("glue");
30
31int
32ndb_back_delete( Operation *op, SlapReply *rs )
33{
34	struct ndb_info *ni = (struct ndb_info *) op->o_bd->be_private;
35	Entry	e = {0};
36	Entry	p = {0};
37	int		manageDSAit = get_manageDSAit( op );
38	AttributeDescription *children = slap_schema.si_ad_children;
39	AttributeDescription *entry = slap_schema.si_ad_entry;
40
41	NdbArgs NA;
42	NdbRdns rdns;
43	struct berval matched;
44
45	int	num_retries = 0;
46
47	int     rc;
48
49	LDAPControl **preread_ctrl = NULL;
50	LDAPControl *ctrls[SLAP_MAX_RESPONSE_CONTROLS];
51	int num_ctrls = 0;
52
53	Debug( LDAP_DEBUG_ARGS, "==> " LDAP_XSTRING(ndb_back_delete) ": %s\n",
54		op->o_req_dn.bv_val, 0, 0 );
55
56	ctrls[num_ctrls] = 0;
57
58	/* allocate CSN */
59	if ( BER_BVISNULL( &op->o_csn ) ) {
60		struct berval csn;
61		char csnbuf[LDAP_PVT_CSNSTR_BUFSIZE];
62
63		csn.bv_val = csnbuf;
64		csn.bv_len = sizeof(csnbuf);
65		slap_get_csn( op, &csn, 1 );
66	}
67
68	if ( !be_issuffix( op->o_bd, &op->o_req_ndn ) ) {
69		dnParent( &op->o_req_dn, &p.e_name );
70		dnParent( &op->o_req_ndn, &p.e_nname );
71	}
72
73	/* Get our NDB handle */
74	rs->sr_err = ndb_thread_handle( op, &NA.ndb );
75	rdns.nr_num = 0;
76	NA.rdns = &rdns;
77	NA.ocs = NULL;
78	NA.e = &e;
79	e.e_name = op->o_req_dn;
80	e.e_nname = op->o_req_ndn;
81
82	if( 0 ) {
83retry:	/* transaction retry */
84		NA.txn->close();
85		NA.txn = NULL;
86		Debug( LDAP_DEBUG_TRACE,
87			"==> " LDAP_XSTRING(ndb_back_delete) ": retrying...\n",
88			0, 0, 0 );
89		if ( op->o_abandon ) {
90			rs->sr_err = SLAPD_ABANDON;
91			goto return_results;
92		}
93		if ( NA.ocs ) {
94			ber_bvarray_free( NA.ocs );
95			NA.ocs = NULL;
96		}
97		ndb_trans_backoff( ++num_retries );
98	}
99
100	/* begin transaction */
101	NA.txn = NA.ndb->startTransaction();
102	rs->sr_text = NULL;
103	if( !NA.txn ) {
104		Debug( LDAP_DEBUG_TRACE,
105			LDAP_XSTRING(ndb_back_delete) ": startTransaction failed: %s (%d)\n",
106			NA.ndb->getNdbError().message, NA.ndb->getNdbError().code, 0 );
107		rs->sr_err = LDAP_OTHER;
108		rs->sr_text = "internal error";
109		goto return_results;
110	}
111
112	/* get entry */
113	rs->sr_err = ndb_entry_get_info( op, &NA, 1, &matched );
114	switch( rs->sr_err ) {
115	case 0:
116	case LDAP_NO_SUCH_OBJECT:
117		break;
118#if 0
119	case DB_LOCK_DEADLOCK:
120	case DB_LOCK_NOTGRANTED:
121		goto retry;
122#endif
123	case LDAP_BUSY:
124		rs->sr_text = "ldap server busy";
125		goto return_results;
126	default:
127		rs->sr_err = LDAP_OTHER;
128		rs->sr_text = "internal error";
129		goto return_results;
130	}
131
132	if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ||
133		( !manageDSAit && bvmatch( NA.ocs, &glue_bv ))) {
134		Debug( LDAP_DEBUG_ARGS,
135			"<=- " LDAP_XSTRING(ndb_back_delete) ": no such object %s\n",
136			op->o_req_dn.bv_val, 0, 0);
137
138		if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
139			rs->sr_matched = matched.bv_val;
140			if ( NA.ocs )
141				ndb_check_referral( op, rs, &NA );
142		} else {
143			rs->sr_matched = p.e_name.bv_val;
144			rs->sr_err = LDAP_NO_SUCH_OBJECT;
145		}
146		goto return_results;
147	}
148
149	/* check parent for "children" acl */
150	rs->sr_err = access_allowed( op, &p,
151		children, NULL, ACL_WDEL, NULL );
152
153	if ( !rs->sr_err  ) {
154		Debug( LDAP_DEBUG_TRACE,
155			"<=- " LDAP_XSTRING(ndb_back_delete) ": no write "
156			"access to parent\n", 0, 0, 0 );
157		rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
158		rs->sr_text = "no write access to parent";
159		goto return_results;
160	}
161
162	rs->sr_err = ndb_entry_get_data( op, &NA, 1 );
163
164	rs->sr_err = access_allowed( op, &e,
165		entry, NULL, ACL_WDEL, NULL );
166
167	if ( !rs->sr_err  ) {
168		Debug( LDAP_DEBUG_TRACE,
169			"<=- " LDAP_XSTRING(ndb_back_delete) ": no write access "
170			"to entry\n", 0, 0, 0 );
171		rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
172		rs->sr_text = "no write access to entry";
173		goto return_results;
174	}
175
176	if ( !manageDSAit && is_entry_referral( &e ) ) {
177		/* entry is a referral, don't allow delete */
178		rs->sr_ref = get_entry_referrals( op, &e );
179
180		Debug( LDAP_DEBUG_TRACE,
181			LDAP_XSTRING(ndb_back_delete) ": entry is referral\n",
182			0, 0, 0 );
183
184		rs->sr_err = LDAP_REFERRAL;
185		rs->sr_matched = e.e_name.bv_val;
186		rs->sr_flags = REP_REF_MUSTBEFREED;
187		goto return_results;
188	}
189
190	if ( get_assert( op ) &&
191		( test_filter( op, &e, (Filter *)get_assertion( op )) != LDAP_COMPARE_TRUE ))
192	{
193		rs->sr_err = LDAP_ASSERTION_FAILED;
194		goto return_results;
195	}
196
197	/* pre-read */
198	if( op->o_preread ) {
199		if( preread_ctrl == NULL ) {
200			preread_ctrl = &ctrls[num_ctrls++];
201			ctrls[num_ctrls] = NULL;
202		}
203		if( slap_read_controls( op, rs, &e,
204			&slap_pre_read_bv, preread_ctrl ) )
205		{
206			Debug( LDAP_DEBUG_TRACE,
207				"<=- " LDAP_XSTRING(ndb_back_delete) ": pre-read "
208				"failed!\n", 0, 0, 0 );
209			if ( op->o_preread & SLAP_CONTROL_CRITICAL ) {
210				/* FIXME: is it correct to abort
211				 * operation if control fails? */
212				goto return_results;
213			}
214		}
215	}
216
217	/* Can't do it if we have kids */
218	rs->sr_err = ndb_has_children( &NA, &rc );
219	if ( rs->sr_err ) {
220		Debug(LDAP_DEBUG_ARGS,
221			"<=- " LDAP_XSTRING(ndb_back_delete)
222			": has_children failed: %s (%d)\n",
223			NA.txn->getNdbError().message, NA.txn->getNdbError().code, 0 );
224		rs->sr_err = LDAP_OTHER;
225		rs->sr_text = "internal error";
226		goto return_results;
227	}
228	if ( rc == LDAP_COMPARE_TRUE ) {
229		Debug(LDAP_DEBUG_ARGS,
230			"<=- " LDAP_XSTRING(ndb_back_delete)
231			": non-leaf %s\n",
232			op->o_req_dn.bv_val, 0, 0);
233		rs->sr_err = LDAP_NOT_ALLOWED_ON_NONLEAF;
234		rs->sr_text = "subordinate objects must be deleted first";
235		goto return_results;
236	}
237
238	/* delete info */
239	rs->sr_err = ndb_entry_del_info( op->o_bd, &NA );
240	if ( rs->sr_err != 0 ) {
241		Debug(LDAP_DEBUG_TRACE,
242			"<=- " LDAP_XSTRING(ndb_back_delete) ": del_info failed: %s (%d)\n",
243			NA.txn->getNdbError().message, NA.txn->getNdbError().code, 0 );
244		rs->sr_text = "DN index delete failed";
245		rs->sr_err = LDAP_OTHER;
246		goto return_results;
247	}
248
249	/* delete data */
250	rs->sr_err = ndb_entry_del_data( op->o_bd, &NA );
251	if ( rs->sr_err != 0 ) {
252		Debug( LDAP_DEBUG_TRACE,
253			"<=- " LDAP_XSTRING(ndb_back_delete) ": del_data failed: %s (%d)\n",
254			NA.txn->getNdbError().message, NA.txn->getNdbError().code, 0 );
255		rs->sr_text = "entry delete failed";
256		rs->sr_err = LDAP_OTHER;
257		goto return_results;
258	}
259
260	if( op->o_noop ) {
261		if (( rs->sr_err=NA.txn->execute( NdbTransaction::Rollback,
262			NdbOperation::AbortOnError, 1 )) != 0 ) {
263			rs->sr_text = "txn (no-op) failed";
264		} else {
265			rs->sr_err = LDAP_X_NO_OPERATION;
266		}
267	} else {
268		if (( rs->sr_err=NA.txn->execute( NdbTransaction::Commit,
269			NdbOperation::AbortOnError, 1 )) != 0 ) {
270			rs->sr_text = "txn_commit failed";
271		} else {
272			rs->sr_err = LDAP_SUCCESS;
273		}
274	}
275
276	if( rs->sr_err != LDAP_SUCCESS && rs->sr_err != LDAP_X_NO_OPERATION ) {
277		Debug( LDAP_DEBUG_TRACE,
278			LDAP_XSTRING(ndb_back_delete) ": txn_%s failed: %s (%d)\n",
279			op->o_noop ? "abort (no-op)" : "commit",
280			NA.txn->getNdbError().message, NA.txn->getNdbError().code );
281		rs->sr_err = LDAP_OTHER;
282		rs->sr_text = "commit failed";
283
284		goto return_results;
285	}
286	NA.txn->close();
287	NA.txn = NULL;
288
289	Debug( LDAP_DEBUG_TRACE,
290		LDAP_XSTRING(ndb_back_delete) ": deleted%s id=%08lx dn=\"%s\"\n",
291		op->o_noop ? " (no-op)" : "",
292		e.e_id, op->o_req_dn.bv_val );
293	rs->sr_err = LDAP_SUCCESS;
294	rs->sr_text = NULL;
295	if( num_ctrls ) rs->sr_ctrls = ctrls;
296
297return_results:
298	if ( NA.ocs ) {
299		ber_bvarray_free_x( NA.ocs, op->o_tmpmemctx );
300		NA.ocs = NULL;
301	}
302
303	/* free entry */
304	if( e.e_attrs != NULL ) {
305		attrs_free( e.e_attrs );
306		e.e_attrs = NULL;
307	}
308
309	if( NA.txn != NULL ) {
310		NA.txn->execute( Rollback );
311		NA.txn->close();
312	}
313
314	send_ldap_result( op, rs );
315	slap_graduate_commit_csn( op );
316
317	if( preread_ctrl != NULL && (*preread_ctrl) != NULL ) {
318		slap_sl_free( (*preread_ctrl)->ldctl_value.bv_val, op->o_tmpmemctx );
319		slap_sl_free( *preread_ctrl, op->o_tmpmemctx );
320	}
321	return rs->sr_err;
322}
323