openldap-technical

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9991 discussions

LDAP at the UKUUG Spring 2009 Conference
by Andrew Findlay 11 Feb '09

11 Feb '09

The UKUUG Spring 2009 Conference (24-26 March 2009 in London) has a strong LDAP flavour. OpenLDAP and other LDAP technologies are covered by several papers: * OpenLDAP Replication Strategies Gavin Henry (Suretec Systems & OpenLDAP project) * OpenLDAP and MySQL: Bridging the Data Model Divide Howard Chu (Symas Corp. & OpenLDAP project) * Writing Access Control Policies for LDAP Andrew Findlay (Skills 1st) * Securing Access to UNIX, Linux and Mac with Active Directory Barry Scott (Centrify) There is also a Kerberos tutorial and several papers on systems monitoring. The programme is here: http://www.ukuug.org/events/spring2009/programme/ Andrew -- ----------------------------------------------------------------------- | From Andrew Findlay, Skills 1st Ltd | | Consultant in large-scale systems, networks, and directory services | | http://www.skills-1st.co.uk/ +44 1628 782565 | -----------------------------------------------------------------------

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Openldap RWM/AD Bind
by Chris Natter 11 Feb '09

11 Feb '09

Hi, I'm hoping someone can help me out on this. At the moment I have this setup: database ldap suffix "ou=foo.com,o=mail" uri "ldap://4.4.4.4:389/" rootdn "cn=Overlord,dc=foo,dc=com" idassert-bind bindmethod=simple binddn="cn=BAR LDAP Proxy Account,cn=Users,dc=bar,dc=local" credentials="w00tz0r" mode=none flags=override,prescriptive rebind-as-user yes overlay rwm rwm-suffixmassage "dc=bar,dc=local" rwm-map attribute proxyAddresses * rwm-map attribute sAMAccountName * rwm-map attribute cn * rwm-map attribute givenName * rwm-map attribute mail * rwm-map attribute sn * rwm-map attribute * 4.4.4.4 is an Active Directory server. This seems to work fine for simple searches and the like again ou=foo.com,o=mail, however I need to setup an application against it. The way the application works for authentication is it uses an openldap service account, finds the user's email address in the directory via proxy, then tries to rebind as that user to the directory via proxy. I'm imagining this setup doesn't work because of the service account handling the bind for the actual directory search transparently, you can't just bind as a user through it. (specifically, I get inappropriateAuthentication/error code 48) Is there a way to implement what I need? Thanks for any help in advance. -Chris

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ssh certificate ldap
by Peter Gordon 11 Feb '09

11 Feb '09

Hi. I have the following setup: pam.d/ssh #%PAM0.0 auth required /lib/security/pam_nologin.so auth sufficient /lib/security/pam_ldap.so auth required /lib/security/pam_unix_auth.so try_first_pass account [success=ok perm_denied=die default=ignore] /lib/security/pam_ldap.so account required /lib/security/pam_unix_acct.so password sufficient /lib/security/pam_ldap.so session required /lib/security/pam_unix_session.so User logins are filtered by the line pam_filter in /etc/ldap.conf. All the conf files are soft links to this file. The configuration works for a user without a certificate. Which is to say, users belonging to the correct group as defined in the filter can login, others cannot. If the user has an ssh certificate pair, and the public key appears on the target, and there is no password needed, the pam_filter is not used. Is there any way to ensure that even users with certificates have to pass the pam_filter? Thanks, Peter

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Block IP address after failure Bind
by jakjr 11 Feb '09

11 Feb '09

Hello, Is there a way to block a specific ip address when this ip attempt to bind many times if failure result ?? This could be useful to prevent a brute-force attack. I know that ppolicy can lockout the user after some failed attempts. But I would like to block new connections from the IP, after this IP try to make a number of fail binds. Best regards, Jakjr

4 4

Problem when using OpenLDAP query to AD server
by Duong Pham Tung 10 Feb '09

10 Feb '09

Hi all, I am testing a OpenLDAP act as LDAP proxy server using meta-backend. My back-end server contain AD servers and some OpenLDAP servers. When this OpenLDAP server connects to other OpenLDAP servers to query data, everything is okie, I get any data as I desire. But, when I use this server query to AD server, the return code is always Operation Error. I debug this process and I get a error which AD server return to my OpenLDAP server "errorMessage: 00000000: LdapErr: DSID-0C090627, comment: In order to perform this operation a successful bind must be completed on the connection., data 0, vece" although I had configured a binddn and bindpw for my OpenLDAP server. But if I using ldapsearch, query directly to AD server and specify username and password, everything is okie :-(. Here is a piece of my sldapd.conf: database meta suffix "dc=abc,dc=com " uri "ldap://10.3.0.24/dc=abc,dc=com " binddn "cn=root,dc=abc,dc=com " bindpw 123 suffix "dc=xyz,dc=net" uri "ldap://10.3.0.26/dc=xyz,dc=net" binddn "cn=openldap,cn=Users,dc=xyz,dc=net" bindpw 123 map attribute uid sAMAccountName map attribute cn name map attribute mail userPrincipalName map objectClass account user map attribute * Note: 10.3.0.24 is a OpenLDAP server IP and 10.3.0.26 is AD server IP. I used openldap(a)xyz.net to query data from AD server directly and It is okie. But in this case, I got an error. Any idea for my problem? Thanks and best regards,

2 4

nss_ldap SSL/TLS problems..
by Arjun Singh 10 Feb '09

10 Feb '09

Hi, I'm trying to set up an ldap server on FreeBSD 7.1-RELEASE. I sent this to the freebsd-support list as well, but I don't think this is FreeBSD specific so I thought I'd ask here too. I installed all of the latest versions of openldap24-server, openldap24-client, nss_ldap, and pam_ldap. When I do any sort of ldapsearch or 'getent passwd' or anything, everything works perfectly. The only time I have trouble is when I'm logging in via SSH..then it gets really weird. 1.) When I log in as a user in LDAP only and give the incorrect password first and then supply the correct password, everything works fine. If the user is in wheel, I can sudo. 2.) When I log in as the same user and give only the correct password the first time, it hangs for roughly 45 seconds and then lets me in. Even though this user is in wheel, it says that the user is not in the sudoers file. Here are the log messages I get in auth.log that correspond to the events above: sshd[54031]: pam_ldap: error trying to bind as user "uid=user..(cut)..." (Invalid credentials) # This is the incorrect pw sshd[54029]: error: PAM: authentication error for user from localhost #Incorrect pw sshd[54032]: nss_ldap: could not search LDAP server - Server is unavailable # correct pw sshd[54029]: Accepted keyboard-interactive/pam for user from localhost port 32935 ssh2 #correct pw When I enter just the right password, the first time, I get this in the log: sshd[54047]: Accepted keyboard-interactive/pam for user from localhost port 51972 ssh2 sshd[54050]: nss_ldap: could not get LDAP result - Can't contact LDAP server Again, when SSL/TLS are disabled, I get normal log output and none of the weird stuff above.. I turned on debugging in nss_ldap.conf and found that each time I gave only the correct password (corresponding with the 45 second hang) I found this in the debug output: ...bunch of normal looking output... ldap_chkResponseList ld 0x801b31480 msgid 5 all 0 ldap_chkResponseList returns ld 0x801b31480 NULL ldap_int_select read1msg: ld 0x801b31480 msgid 5 all 0 ber_get_next TLS trace: SSL3 alert write:fatal:bad record mac <--- what is the cause of this? ldap_free_connection 1 0 ldap_free_connection: actually freed ldap_err2string ldap_result ld 0x801b31480 msgid 5 wait4msg ld 0x801b31480 msgid 5 (timeout 30000000 usec) wait4msg continue ld 0x801b31480 msgid 5 all 0 ** ld 0x801b31480 Connections: ** ld 0x801b31480 Outstanding Requests: Empty ld 0x801b31480 request count 0 (abandoned 0) ** ld 0x801b31480 Response Queue: Empty I get the above regardless of whether I'm using start_tls or ssl. If you have any insight, it'd be really useful. I've spent tons of time scouring lists for help and haven't found anything yet.. Thanks, -Arjun

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User to administrate a OU
by Leandro Repolho 10 Feb '09

10 Feb '09

Hello, i don't know if is it possible to do it but i would like to create a User inside an OU of my OpenLDAP server and when this user connects to a ldap manager like phpLdapAdmin he needs to see all objects inside his OU and manage them. Is it possible to do it? Thank you very much, -- Leandro Cascino Repolho

2 1

help in ldap and webmin
by Sufyan Aqtam 10 Feb '09

10 Feb '09

Hi all I have a problem in openldap server. I configured an ldap server with bdb that contains about 25000 user. It works perfect to answer the authentication requests and modifying existing users. I am using the webmin "LDAP Users and Groups" module to create new users. When I fill the information for a new user and click on create button it takes a very long time to create the user. I check the log file of ldap server and I find that it starts access all users in the database. The messages in the log file as below and it is repeated for all users: conn=19 op=1 ENTRY dn="uid=testuser,ou=users,dc=example,dc=com" Feb 7 10:38:42 testserver slapd[25075]: <= send_search_entry: conn 19 exit. Feb 7 10:38:42 testserver slapd[25075]: entry_decode: "uid=testuser,ou=Users,dc=example,dc=com" Feb 7 10:38:42 testserver slapd[25075]: <= entry_decode(uid=testuser,ou=Users,dc=example,dc=com) Feb 7 10:38:42 testserver slapd[25075]: => bdb_dn2id("uid=testuser,ou=users,dc=example,dc=com") Feb 7 10:38:42 testserver slapd[25075]: <= bdb_dn2id: got id=0x24 Feb 7 10:38:42 testserver slapd[25075]: => test_filter Feb 7 10:38:42 testserver slapd[25075]: EQUALITY Feb 7 10:38:42 testserver slapd[25075]: => access_allowed: search access to "uid=testuser,ou=Users,dc=example,dc=com" "objectClass" requested Feb 7 10:38:42 testserver slapd[25075]: <= root access granted Feb 7 10:38:42 testserver slapd[25075]: <= test_filter 6 Feb 7 10:38:42 testserver slapd[25075]: => send_search_entry: conn 19 dn="uid=testuser,ou=Users,dc=example,dc=com" Feb 7 10:38:42 testserver slapd[25075]: => access_allowed: read access to "uid=testuser,ou=Users,dc=example,dc=com" "entry" requested Feb 7 10:38:42 testserver slapd[25075]: <= root access granted Feb 7 10:38:42 testserver slapd[25075]: => access_allowed: read access to "uid=testuser,ou=Users,dc=example,dc=com" "uid" requested Feb 7 10:38:42 testserver slapd[25075]: <= root access granted Feb 7 10:38:42 testserver slapd[25075]: => access_allowed: read access to "uid=testuser,ou=Users,dc=example,dc=com" "cn" requested Feb 7 10:38:42 testserver slapd[25075]: <= root access granted Feb 7 10:38:42 testserver slapd[25075]: => access_allowed: read access to "uid=testuser,ou=Users,dc=example,dc=com" "objectClass" requested Feb 7 10:38:42 testserver slapd[25075]: <= root access granted Feb 7 10:38:42 testserver slapd[25075]: => access_allowed: read access to "uid=testuser,ou=Users,dc=example,dc=com" "userPassword" requested Feb 7 10:38:42 testserver slapd[25075]: <= root access granted Feb 7 10:38:42 testserver slapd[25075]: => access_allowed: read access to "uid=testuser,ou=Users,dc=example,dc=com" "shadowLastChange" requested Feb 7 10:38:42 testserver slapd[25075]: <= root access granted Feb 7 10:38:42 testserver slapd[25075]: => access_allowed: read access to "uid=testuser,ou=Users,dc=example,dc=com" "shadowMax" requested Feb 7 10:38:42 testserver slapd[25075]: <= root access granted Feb 7 10:38:42 testserver slapd[25075]: => access_allowed: read access to "uid=testuser,ou=Users,dc=example,dc=com" "shadowWarning" requested Feb 7 10:38:42 testserver slapd[25075]: <= root access granted Feb 7 10:38:42 testserver slapd[25075]: => access_allowed: read access to "uid=testuser,ou=Users,dc=example,dc=com" "loginShell" requested Feb 7 10:38:42 testserver slapd[25075]: <= root access granted Feb 7 10:38:42 testserver slapd[25075]: => access_allowed: read access to "uid=testuser,ou=Users,dc=example,dc=com" "uidNumber" requested Feb 7 10:38:42 testserver slapd[25075]: <= root access granted Feb 7 10:38:42 testserver slapd[25075]: => access_allowed: read access to "uid=testuser,ou=Users,dc=example,dc=com" "gidNumber" requested Feb 7 10:38:42 testserver slapd[25075]: <= root access granted Feb 7 10:38:42 testserver slapd[25075]: => access_allowed: read access to "uid=testuser,ou=Users,dc=example,dc=com" "homeDirectory" requested Feb 7 10:38:43 testserver slapd[25075]: <= root access granted I hope to help me with many thanks to your efforts. Regards

2 4

Unable to logon to any server as a locally defined user if the OpenLDAP server is unavailable.
by Sean Leinart 10 Feb '09

10 Feb '09

Greetings OpenLDAP Technical Mailing List, I would generally consider myself at the newb status when it comes to LDAP in the Linux environment. I have acquired a network from a previous admin and my issue is that if the LDAP server is offline I can not authenticate locally on any of my servers, which is obviously a huge problem. The version of Open LDAP is: [user@server:/usr/sbin]slapd -VV @(#) $OpenLDAP: slapd 2.2.13 (Jul 11 2008 09:16:05) $ mockbuild@builder16.centos.org:/builddir/build/BUILD/openldap-2.2.13/openldap-2.2.13/build-servers/servers/slapd The Linux Version is: [user@server:/]uname -a Linux server.host.local 2.6.9-42.0.10.ELsmp #1 SMP Tue Feb 27 10:11:19 EST 2007 i686 i686 i386 GNU/Linux I have read several items regarding the fact that this can be a common issue when using LDAP authentication. I have read to check the settings in the nsswitch.conf file on the systems in question to verify that "Files" are being looked at first etc. and all of these settings appear to be correct. I am looking for guidance on what would be the best thing to do in this case, and why is it broken when the ldap server is not available. What happens is, if the LDAP server is not available, and you attempt to logon to a server locally, you enter the userid and password and you will have no activity for a minute or so then the prompt goes directly back to the login prompt. The userid and password that is being used is locally defined on the server. Also PAM LDAP is being utilized. Any help or ideas on what to look for would be greatly appreciated. Is there a way to just turn off the LDAP authentication on the servers. I feel that the answer to this is probably no. That would simply be too easy. Thanks in advance for any responses. sean sleinart(a)fscarolina.com No virus found in this outgoing message. Checked by AVG. Version: 7.5.552 / Virus Database: 270.10.19/1941 - Release Date: 2/9/2009 6:50 AM

2 1

Re: How to set BDB "read-only" before slapcat command ?
by Andrew Hall 09 Feb '09

09 Feb '09

Thanks all for your comments / answers / criticisms on this issue. It's been helpful and informative and is much appreciated. Andy.

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