[Samba] samba log level: ldap log file remains empty

Hoefle, Marco (Avnet Silica) Marco.Hoefle at avnet.eu
Mon Nov 25 16:06:04 UTC 2024


>>Op 25-11-2024 om 11:57 schreef Rowland Penny via samba:
>>> On Mon, 25 Nov 2024 11:44:28 +0100
>>> Kees van Vloten via samba <samba at lists.samba.org> wrote:
>>>
>>>> Op 25-11-2024 om 11:35 schreef Rowland Penny via samba:
>>>>> On Mon, 25 Nov 2024 09:48:19 +0000
>>>>> "Hoefle, Marco \(Avnet Silica\) via samba" <samba at lists.samba.org>
>>>>> wrote:
>>>>>
>>>>>> Hello,
>>>>>> I have different services using ldap for user/passwd queries. I am
>>>>>> using the LDAP server integrated in the samba domain controller.
>>>>>> For debugging and login attempts I wanted to have all requests in a
>>>>>> separate log file. I am using the 2:4.19.5+dfsg-4ubuntu9 (standard
>>>>>> ubuntu 24.04 package) samba package.
>>>>>>
>>>>>>
>>>>>> This is the relevant samba dc config:
>>>>>>
>>>>>>     server role = active directory domain controller
>>>>>>     server services = s3fs, rpc, nbt, wrepl, ldap, cldap, kdc,
>>>>>> drepl, winbindd, ntp_signd, kcc, dnsupdate workgroup = TRAUTES
>>>>>>     idmap_ldb:use rfc2307 = yes
>>>>>>     allow dns updates = nonsecure and secure
>>>>>>     log level = 2
>>>>>> auth_json_audit:3@/var/log/samba/domain_join.log
>>>>>> ldap:10@/var/log/samba/ldap.log auth:5 passdb:5 rpc_srv:5
>>>>>> rpc_parse:5 dnsupdate:10@/var/log/samba/dnsupdate.log log file =
>>>>>> /var/log/samba/log.%m
>>>>>>
>>>>>> The domain join log file ( /var/log/samba/domain_join.log) is
>>>>>> created and works (I see each domain join approach). The LDAP
>>>>>> queries are not in the file. /var/log/samba/ldap.log is created
>>>>>> but remains empty even after a successful LDAP query.
>>>>>>
>>>>>> Generally, I cannot see any ldap requests in the other log files
>>>>>> either.
>>>>> Sorry, but this is because there is no 'ldap' debug class. If you
>>>>> read 'man smb.conf' under 'log level', you will find a full list of
>>>>> available debug classes. There is 'ldb' if you can use the ldb-tools
>>>>> instead (note: this may work with ldapsearch etc, but I haven't
>>>>> tried it.).
>>>> In 4.21 there is "ldapsrv" to log ldap queries.
>>>>
>>> Well, yes there is, but the OP may not be able to update or is not
>>> allowed to use external repos, but if they can, I would always
>>> recommend using the latest Samba version possible.
>>Indeed upgrading is the easiest way to solve it. I still have an
>>"ldapsrv" patch that works for 4.17 (I can make it available if needed),
>>however it stopped working in 4.18 and someone updated the patch for
>>4.21, where it got merged. That does not help much for 4.19.5 :-(
>>>
>>> However, the OP seems to be using Samba AD for authentication via ldap,
>>> they may be able to use kerberos instead, but this would entail joining
>>> the domain.

>>There are many more services and applications (e.g. web-applications)
>>that support authentication through LDAP than there are that support
>>Kerberos. That's why I (have to) use LDAP authentication (and
>>authorization) in many places.

>>Even a webserver like Apache can do Kerberos for authentication only, if
>>you want authorization in Apache you still need LDAP as it does not
>>support looking at the groups in the PAC. Another solution is to use an
>>intermediate like Keycloak to provide authn+authz through OIDC.

>>- Kees.

Thanks Kees,
I tried to upgrade by using debian testing (in a docker container) but I get other issues then. I saw that ldapsrv is supported in the debian testing samba version.
With the current settings I can see the ldap requests in the main log:

samba      | {"timestamp": "2024-11-25T16:06:44.021365+0100", "type": "Authentication", "Authentication": {"version": {"major": 1, "minor": 3}, "eventId": 4624, "logonId": "0", "logonType": 8, "status": "NT_STATUS_OK", "localAddress": "ipv4:10.3.0.5:389", "remoteAddress": "ipv4:10.3.0.6:35370", "serviceDescription": "LDAP", "authDescription": "simple bind", "clientDomain": "xxx", "clientAccount": "CN=binddn,CN=Users,DC=xxx,DC=xxx", "workstation": "DC", "becameAccount": "binddn", "becameDomain": "xxx", "becameSid": "S-1-5-21-3518546476-3047455531-1007412457-1104", "mappedAccount": "binddn", "mappedDomain": "xxx", "netlogonComputer": null, "netlogonTrustAccount": null, "netlogonNegotiateFlags": "0x00000000", "netlogonSecureChannelType": 0, "netlogonTrustAccountSid": null, "passwordType": "Plaintext", "clientPolicyAccessCheck": null, "serverPolicyAccessCheck": null, "duration": 1995}}
samba      | Calling samba_kcc script

/Marco




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