Public bug reported:
lsb_release -rd
No LSB modules are available.
Description: Ubuntu 24.04.2 LTS
Release: 24.04
apt-cache policy adsys
adsys:
Installé : 0.16.3~24.04.1
Candidat : 0.16.3~24.04.1
Table de version :
*** 0.16.3~24.04.1 500
500 http://fr.archive.ubuntu.com/ubuntu noble-updates/main amd64
Packages
100 /var/lib/dpkg/status
0.14.3~24.04ubuntu0.1 500
500 http://security.ubuntu.com/ubuntu noble-security/main amd64 Packages
0.14.1build1 500
500 http://fr.archive.ubuntu.com/ubuntu noble/main amd64 Packages
On Ubuntu 24.04 LTS, with a workstation joined to an Active Directory
domain using `realm` and `sssd`, the `adsysd` service attempts to
contact the domain controller via `ldap://`, even when `ad_use_ldaps =
True` is set in the SSSD configuration.
In environments where unencrypted LDAP is disabled for security reasons,
this results in failure to retrieve GPOs:
Failed to connect to 'ldap://dc.domain.local' with backend 'ldap':
NT_STATUS_INVALID_PARAMETER
It appears that `adsys` does not honor the LDAPS configuration from
SSSD, and there is no option in `/etc/adsys.yaml` to explicitly force
`ldaps://`.
=== Expected Behavior ===
- `adsys` should respect the LDAPS configuration from SSSD, or
- Provide a configuration option in `adsys.yaml` to explicitly use `ldaps://`
instead of `ldap://`.
=== Security Justification ===
1. LDAP transmits credentials in cleartext unless TLS is used.
2. LDAPS encrypts all traffic from the start, unlike STARTTLS.
3. STARTTLS is more vulnerable to downgrade attacks.
4. Microsoft recommends disabling unsigned LDAP and enabling LDAP signing and
channel binding.
5. LDAPS is easier to enforce and audit.
References:
-
https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-adts/8e73932f-70cf-46d6-88b1-8d9f86235e81
-
https://learn.microsoft.com/en-us/answers/questions/1613606/disable-ldap-389-and-enforce-ldaps-636-in-ad
-
https://learn.microsoft.com/en-us/troubleshoot/windows-server/active-directory/enable-ldap-over-ssl-3rd-certification-authority
** Affects: adsys (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2117244
Title:
adsys attempts insecure LDAP connection despite LDAPS-only environment
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