openldap-technical March 2024

openldap-technical@openldap.org

24 participants
17 discussions

LMDB fix sized key and data question
by anton＠pcloud.com 07 Mar '24

07 Mar '24

Hello, I'm designing an application that will use LMDB. All (or almost all) of my databases will have a fixed size integer key (64bit) and fixed size data. Data is larger than a single integer but generally in 16-32 bytes range (range is for different databases, each database has a fixed data format). I'll not have duplicate key records. I'll mostly insert and retrieve single records. The question is would I benefit and should I use MDB_DUPSORT|MDB_DUPFIXED? Also the documentation says that MDB_DUPFIXED may only be used with MDB_DUPSORT. However I see code that specifically checks for MDB_DUPFIXED without MDB_DUPSORT and only then sets a flag for DUPFIXED records. However I did not get too deep in the code. https://github.com/LMDB/lmdb/blob/mdb.master/libraries/liblmdb/mdb.c#L7743 My point is that with fixed sized keys and values the btree may chose not to store record sizes, may not use pointers for the binary search but to search values instead and so on. Is that the optimization that is being done for MDB_DUPFIXED or is it something that only concerns duplicate values? Best, Anton

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Counter concurrency access
by Pascal Jakobi 06 Mar '24

06 Mar '24

Hi there I am creating a program that needs to increment a counter. Typically a serial number has to be incremented every time I create a certificate. The problem is to handle concurrent access. Fundamentally I need to 1/ read the counter 2/ increment it. Therefore no one must be provided access to the counter during these two operations. Therefore I need to set a lock before the read operation and release it after the update. Is there a way to do this with OL ? I am conscious of the ldapmodify features thanks to Clement, however, this will not lock the read. Thks in adv. P

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slapo-translucent bug?
by Marco Esposito M. 05 Mar '24

05 Mar '24

Dear openldap-technical, I have encountered an issue with slapo-translucent and I am trying to determine whether it is a problem with my configuration or a bug. By mistake, I opened a ticket on OpenLDAP ITS, and rightfully, I have been redirected here. https://bugs.openldap.org/show_bug.cgi?id=10184 The problem is as follows: the results from a translucent OpenLDAP server do not return any entry when a single attribute is present in the query filter. This attribute has been previously modified and is present in the local database of the translucent OpenLDAP server. To better explain the issue, I have set up an environment with containers. The repository is as follows: https://github.com/voidloop/openldap-bug To bring up the environment, two commands are needed: % make submodules % make docker-run Three containers will be running: upstream: a simple LDAP server with a couple of users, listening on port 51389/tcp. buggy: the translucent server from upstream with the problematic behavior, listening on port 52389/tcp. compiled: the translucent server from upstream recompiled with the modified code where I suspect there might be an issue, listening on port 53389/tcp. The containers are simple Fedora instances with OpenLDAP. Once the following ldapmodify command is executed: % ldapmodify -x -D cn=buggy,dc=example,dc=com -w password -H ldap://:52389 <<EOF dn: uid=ciccio,ou=people,dc=example,dc=com changetype: modify replace: uidNumber uidNumber: 99 EOF The following occurs: 1) Querying servers without filters: ------------------------------------------------------------------------------- Server "upstream" ------------------------------------------------------------------------------- % ldapsearch -x -H ldap://:51389 -b ou=people,dc=example,dc=com uid=ciccio # extended LDIF # # LDAPv3 # base <ou=people,dc=example,dc=com> with scope subtree # filter: uid=ciccio # requesting: ALL # # ciccio, people, example.com dn: uid=ciccio,ou=people,dc=example,dc=com objectClass: top objectClass: person objectClass: organizationalPerson objectClass: inetOrgPerson objectClass: posixAccount uid: ciccio cn: Ciccio Bello sn: Bello uidNumber: 1000 gidNumber: 1000 homeDirectory: /home/ciccio # search result search: 2 result: 0 Success # numResponses: 2 # numEntries: 1 ------------------------------------------------------------------------------- Translucent server "buggy" ------------------------------------------------------------------------------- % ldapsearch -x -H ldap://:52389 -b ou=people,dc=example,dc=com uid=ciccio # extended LDIF # # LDAPv3 # base <ou=people,dc=example,dc=com> with scope subtree # filter: uid=ciccio # requesting: ALL # # ciccio, people, example.com dn: uid=ciccio,ou=people,dc=example,dc=com objectClass: top objectClass: person objectClass: organizationalPerson objectClass: inetOrgPerson objectClass: posixAccount uid: ciccio cn: Ciccio Bello sn: Bello uidNumber: 99 gidNumber: 1000 homeDirectory: /home/ciccio # search result search: 2 result: 0 Success # numResponses: 2 # numEntries: 1 ------------------------------------------------------------------------------- Translucent server "compiled" ------------------------------------------------------------------------------- % ldapsearch -x -H ldap://:53389 -b ou=people,dc=example,dc=com uid=ciccio # extended LDIF # # LDAPv3 # base <ou=people,dc=example,dc=com> with scope subtree # filter: uid=ciccio # requesting: ALL # # ciccio, people, example.com dn: uid=ciccio,ou=people,dc=example,dc=com objectClass: top objectClass: person objectClass: organizationalPerson objectClass: inetOrgPerson objectClass: posixAccount uid: ciccio cn: Ciccio Bello sn: Bello uidNumber: 99 gidNumber: 1000 homeDirectory: /home/ciccio # search result search: 2 result: 0 Success # numResponses: 2 So far, everything is okay, no anomalous behavior. The issue arises when a filter is introduced. 2) Querying servers with a filter ------------------------------------------------------------------------------- Server "upstream" ------------------------------------------------------------------------------- % ldapsearch -x -H ldap://:51389 -b ou=people,dc=example,dc=com uid=ciccio uidNumber # extended LDIF # # LDAPv3 # base <ou=people,dc=example,dc=com> with scope subtree # filter: uid=ciccio # requesting: uidNumber # # ciccio, people, example.com dn: uid=ciccio,ou=people,dc=example,dc=com uidNumber: 1000 # search result search: 2 result: 0 Success # numResponses: 2 # numEntries: 1 ------------------------------------------------------------------------------- Translucent server "buggy" (!!) ------------------------------------------------------------------------------- % ldapsearch -x -H ldap://:52389 -b ou=people,dc=example,dc=com uid=ciccio uidNumber # extended LDIF # # LDAPv3 # base <ou=people,dc=example,dc=com> with scope subtree # filter: uid=ciccio # requesting: uidNumber # # search result search: 2 result: 0 Success # numResponses: 1 ------------------------------------------------------------------------------- Translucent server "compiled" ------------------------------------------------------------------------------- % ldapsearch -x -H ldap://:53389 -b ou=people,dc=example,dc=com uid=ciccio uidNumber # extended LDIF # # LDAPv3 # base <ou=people,dc=example,dc=com> with scope subtree # filter: uid=ciccio # requesting: uidNumber # # ciccio, people, example.com dn: uid=ciccio,ou=people,dc=example,dc=com uidNumber: 99 # search result search: 2 result: 0 Success # numResponses: 2 # numEntries: 1 Why does this behavior occur? I expect the "buggy" server to return the uidNumber attribute. The version of OpenLDAP in the container is the one installed with the Fedora package manager. Server configurations are available in the Git repository, but for convenience, I am listing them here: upstream: https://github.com/voidloop/openldap-bug/blob/main/upstream/slapd.ldif https://github.com/voidloop/openldap-bug/blob/main/upstream/entries.ldif buggy: https://github.com/voidloop/openldap-bug/blob/main/buggy/slapd.ldif compiled: https://github.com/voidloop/openldap-bug/blob/main/compiled/slapd.ldif The source code modification is as follows: % diff openldap/servers/slapd/overlays/translucent.c translucent.c -u --- openldap/servers/slapd/overlays/translucent.c 2024-02-29 11:30:52.620837844 +0100 +++ translucent.c 2024-02-29 11:14:11.274843929 +0100 @@ -928,16 +928,7 @@ /* send it now */ rs->sr_entry = re; rs->sr_flags |= REP_ENTRY_MUSTBEFREED; - if ( test_f ) { - rc = test_filter( op, rs->sr_entry, tc->orig ); - if ( rc == LDAP_COMPARE_TRUE ) { - rc = SLAP_CB_CONTINUE; - } else { - rc = 0; - } - } else { - rc = SLAP_CB_CONTINUE; - } + rc = SLAP_CB_CONTINUE; } } else if ( le ) { /* Only a local entry: remote was deleted I have also found posts from individuals who have identified the same issue, but either received no response or the response was unsatisfactory: https://openldap.org/lists/openldap-technical/201304/msg00069.html https://www.openldap.org/lists/openldap-bugs/200905/msg00159.html https://www.openldap.org/lists/openldap-technical/201106/msg00036.html Thank you for your attention, and I apologize for the lengthy message. Marco

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OpenLDAP SQL
by kimkihoon 05 Mar '24

05 Mar '24

I'm trying to use mysql external db server for openLDAP db. I just read this README file from openldap github(https://github.com/openldap/openldap/blob/master/servers/slapd/back-… But it seems only localhost server can be used. Can anyone tell me how? Thx for the help

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Fwd: New Ldap 2.6.6 in Kubernetes
by Jignesh Patel 01 Mar '24

01 Mar '24

We have set up a new docker OpenLDAP Version 2.6.6 on Kubernetes. We could migrate all the data except the following two attributes *authTimestamp* and *lastLoginTime* not working in personalized schema. How to configure them?

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Disable uniqueness for mail Attribute
by CALDEIRA JAVIEL Sandro 01 Mar '24

01 Mar '24

Hi, I have a legacy ldap instance (openlda-2.4) which has in the same redundant user info containing mail attribute among others (objectclass: inetOrgPerson) in 2 different ous (objectclass: organizationalUnit). I know it is a bad design for ldap users structure but I am not allowed to change it in a short time. When I tried to migrate this ldap database to openldap 2.6 I realize this is not possible anymore. I identified it is just related to mail attribute because if I omit mail attribute or use a different value for mail, then all data is imported properly. Error from phpldapadmin: Attribute value would not be unique This update has been or will be cancelled, it would result in an attribute value not being unique. You might like to search the LDAP server for the offending entry. (Search) warn LDIF text import Could not add object cn=*****,ou=Users,ou=TRG01,dc=***,dc=*****,dc=** LDAP said: Success Error number: 0x00 (LDAP_SUCCESS) Description: The operation completed successfully.

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memberOf with groupOfNames
by Stefan Kania 01 Mar '24

01 Mar '24

Hi to all, up to now I only used: olcDlAttrSet: groupOfURLs memberURL member+memberOf@groupOfNames to dynamically add the Attribute memberOf to all members of a groupOfURLs. Is it possible to do the same with members for groupOfNames and groupOfUniqueNames? I yes, can someone please post the syntax? Stefan

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openldap-technical March 2024