thr3ads.net - samba - [Samba] Fwd: ntlm_auth and freeradius [Apr 2023]

If this information is useful, please help other people find it:
Share via:

Alexander Harm || ApfelQ

2023-Apr-06 07:56 UTC

[Samba] Fwd: ntlm_auth and freeradius

I can share my notes, we authenticate UniFi clients via Freeradius against Samba
AD. We also check group membership which you might or might not need:

## 4 FreeRADIUS

### 4.1 Basics

```bash
apt install freeradius freeradius-ldap freeradius-utils

# create new DH-params
openssl dhparam -out /etc/freeradius/3.0/certs/dh 2048
```

### 4.2 Configure Authentication

- modify mschap to use winbind, uncomment the following lines

```
# /etc/freeradius/3.0/mods-available/mschap
require_encryption = yes
require_strong = yes
winbind_username = "%{mschap:User-Name}"
winbind_domain = "%{%{mschap:NT-Domain}:-NTDOMAINNAME}"
winbind_retry_with_normalised_username = yes
```

- add to global section in samba conf

```
# /etc/samba/smb.conf
ntlm auth = mschapv2-and-ntlmv2-only
```

- fix perms and restart

```bash
usermod -a -G winbindd_priv freerad
service freeradius restart
service samba-ad-dc restart
```

### 4.3 Configure LDAP (group information)

- enable ldap

```bash
cd /etc/freeradius/3.0/mods-enabled
ln -s ../mods-available/ldap ldap
chown -h freerad:freerad ldap
```

- modify module ldap to retrieve group information

```
# /etc/freeradius/3.0/mods-available/ldap
server = '10.0.1.250'
server = '10.0.1.251'
identity = 'cn=dc01,cn=users,dc=ds,dc=example,dc=com'
password = ***
base_dn = 'cn=users,dc=ds,dc=example,dc=com'
user: filter =
"(|(samaccountname=%{%{Stripped-User-Name}:-%{User-Name}})(userprincipalname=%{User-Name}))"
group: filter = "(objectClasse=group)"
group: membership_filter =
"(member:1.2.840.113556.1.4.1941:=%{control:Ldap-UserDn})"
start_tls = yes
ca_file = /etc/ssl/certs/ca-certificates.crt
```

### 4.4 Configure EAP

- add root.ca and services.ca to certificate store

```bash
cp /home/dcadmin/root.ca.crt /usr/local/share/ca-certificates/
cp /home/dcadmin/service.ca.crt /usr/local/share/ca-certificates/
update-ca-certificates
```

- add radius cert and key

```bash
cp /home/dcadmin/service.radius.key /etc/freeradius/3.0/certs/service.radius.key
cp /home/dcadmin/service.radius.crt /etc/freeradius/3.0/certs/service.radius.crt

chmod 640 /etc/freeradius/3.0/certs/service.radius.*
chown freerad:freerad /etc/freeradius/3.0/certs/service.radius.*
```

- configure eap module to use peap per default

```
# /etc/freeradius/3.0/mods-available/eap
default_eap_type = peap

#private_key_password = whatever
private_key_file = ${certdir}/service.radius.key
certificate_file = ${certdir}/service.radius.crt

tls_min_version = "1.2"

cache: enable = yes
cache: name = ?<somename>.radius"
cache: persist_dir = "${logdir}/tlscache"

peap: copy_request_to_tunnel = yes
```

### 4.5 Configure Clients

- add client for UniFi

```
# /etc/freeradius/3.0/clients.conf
client unifi {
ipaddr = 10.0.1.0/24
secret = ***
}
```

### 4.6 Configure Authorization

- devices/user via EAP

```
# /etc/freeradius/3.0/sites-enabled/inner-tunnel
post-auth {
if (!(Ldap-Group == ?SOMEGROUP")) {
reject
}
```

### 4.7 Finish

```bash
service freeradius restart
```
> On Thursday, Apr 06, 2023 at 9:46 AM, Matthias K?hne | Ellerhold
Aktiengesellschaft via samba <samba at lists.samba.org (mailto:samba at
lists.samba.org)> wrote:
> Hello Tim, Hello samba-people,
>
> is there an uptodate guide for authenticating via freeradius somewhere?
>
> I have some Ubiquiti APs plus a Cloud Key and I want to authenticate
> WLAN clients via WPA2-Enterprise instead of a (shared) PSK.
>
> It seems like
>
https://wiki.samba.org/index.php/Authenticating_Freeradius_against_Active_Directory
> is missing some steps (basic setup of freeradius).
>
> Can you write up some of your findings please?
>
> Thanks and happy holidays,
> Matthias.
>
> Am 04.04.23 um 10:38 schrieb Tim ODriscoll via samba:
> > Dear All,
> >
> > Well, this is very embarrassing....
> >
> > It seems that running 'smbcontrol all reload-config' isn't
sufficient for reloading the ntlm config parameters.
> >
> > I tried restarting the whole samba service on the DC my FR box was
authenticating against (systemctl restart sernet-samba-ad) and my test laptop is
now connected to the network on the correct VLAN.
> >
> > I apologise for wasting everyone's time - now I'll get back to
cleaning up all the config files and making sure BYOD still works etc.
> >
> > Thank you,
> >
> > Tim
>
> --
> Senior Webentwickler
> Datenschutzbeauftragter
>
> Ellerhold Aktiengesellschaft
> Friedrich-List-Str. 4
> 01445 Radebeul
>
> Telefon: +49 (0) 351 83933-61
> Web: www.ellerhold.de
> Facebook: www.facebook.com/ellerhold.gruppe
> Instagram: www.instagram.com/ellerhold.gruppe
> Twitter: https://twitter.com/EllerholdGruppe
>
> Amtsgericht Dresden / HRB 23769
> Vorstand: Stephan Ellerhold, Maximilian Ellerhold
> Vorsitzender des Aufsichtsrates: Frank Ellerhold
>
>
>
> ---Diese E-Mail und Ihre Anlagen enthalten vertrauliche Mitteilungen.
Sollten Sie nicht der beabsichtigte Adressat sein, so bitten wir Sie um
Mitteilung und um sofortiges l?schen dieser E-Mail und der Anlagen.
>
> Unsere Hinweise zum Datenschutz finden Sie hier:
http://www.ellerhold.de/datenschutz/
>
> This e-mail and its attachments are privileged and confidential. If you are
not the intended recipient, please notify us and immediately delete this e-mail
and its attachments.
>
> You can find our privacy policy here: http://www.ellerhold.de/datenschutz/
>
>
> --
> To unsubscribe from this list go to the following URL and read the
> instructions: https://lists.samba.org/mailman/options/samba

Matthias Kühne | Ellerhold Aktiengesellschaft

2023-Apr-12 10:20 UTC

head link

[Samba] Fwd: ntlm_auth and freeradius

Hello Alexander,

thanks Alexander for these configuration snippets.

Which version of Samba are you using? Is this on debian bullseye? Is the 
FreeRADIUS server installed on a DC or on a Domain Member? (I just 
tested the latter).

is "ntlm auth = yes" OK for the DCs and the domain member or does it 
have to be "mschapv2-and-ntlmv2-only" for all servers (DCs + Member)?
It
looks like "yes" is broader and it should work? Sadly we need
"yes" for
other applications...

Im sad to say that I cant get it to work. Neither "radtest" nor my 
Ubiquity APs...

I always get

(3) mschap: ERROR: When trying to update a password, this return status 
indicates that the value provided as the current password is not 
correct. [0xC000006A]
(3) mschap: ERROR: MS-CHAP2-Response is incorrect

Similar error while using "ntlm_auth" instead of the direct winbind 
connections.

Using ntlm_auth with --username and --password works. Using ntlm_auth 
with --challenge results in the same error message above.

Any help would be much appreciated, otherwise we're going to switch to 
SQL or file based auth (with cleartext password *shudder*).

Thanks and have a nice day, Matthias.

Am 06.04.23 um 09:56 schrieb Alexander Harm || ApfelQ via
samba:> I can share my notes, we authenticate UniFi clients via Freeradius against
Samba AD. We also check group membership which you might or might not need:
>
> ## 4 FreeRADIUS
>
> ### 4.1 Basics
>
> ```bash
> apt install freeradius freeradius-ldap freeradius-utils
>
> # create new DH-params
> openssl dhparam -out /etc/freeradius/3.0/certs/dh 2048
> ```
>
> ### 4.2 Configure Authentication
>
> - modify mschap to use winbind, uncomment the following lines
>
> ```
> # /etc/freeradius/3.0/mods-available/mschap
> require_encryption = yes
> require_strong = yes
> winbind_username = "%{mschap:User-Name}"
> winbind_domain = "%{%{mschap:NT-Domain}:-NTDOMAINNAME}"
> winbind_retry_with_normalised_username = yes
> ```
>
> - add to global section in samba conf
>
> ```
> # /etc/samba/smb.conf
> ntlm auth = mschapv2-and-ntlmv2-only
> ```
>
> - fix perms and restart
>
> ```bash
> usermod -a -G winbindd_priv freerad
> service freeradius restart
> service samba-ad-dc restart
> ```
>
> ### 4.3 Configure LDAP (group information)
>
> - enable ldap
>
> ```bash
> cd /etc/freeradius/3.0/mods-enabled
> ln -s ../mods-available/ldap ldap
> chown -h freerad:freerad ldap
> ```
>
> - modify module ldap to retrieve group information
>
> ```
> # /etc/freeradius/3.0/mods-available/ldap
> server = '10.0.1.250'
> server = '10.0.1.251'
> identity = 'cn=dc01,cn=users,dc=ds,dc=example,dc=com'
> password = ***
> base_dn = 'cn=users,dc=ds,dc=example,dc=com'
> user: filter =
"(|(samaccountname=%{%{Stripped-User-Name}:-%{User-Name}})(userprincipalname=%{User-Name}))"
> group: filter = "(objectClasse=group)"
> group: membership_filter =
"(member:1.2.840.113556.1.4.1941:=%{control:Ldap-UserDn})"
> start_tls = yes
> ca_file = /etc/ssl/certs/ca-certificates.crt
> ```
>
> ### 4.4 Configure EAP
>
> - add root.ca and services.ca to certificate store
>
> ```bash
> cp /home/dcadmin/root.ca.crt /usr/local/share/ca-certificates/
> cp /home/dcadmin/service.ca.crt /usr/local/share/ca-certificates/
> update-ca-certificates
> ```
>
> - add radius cert and key
>
> ```bash
> cp /home/dcadmin/service.radius.key
/etc/freeradius/3.0/certs/service.radius.key
> cp /home/dcadmin/service.radius.crt
/etc/freeradius/3.0/certs/service.radius.crt
>
> chmod 640 /etc/freeradius/3.0/certs/service.radius.*
> chown freerad:freerad /etc/freeradius/3.0/certs/service.radius.*
> ```
>
> - configure eap module to use peap per default
>
> ```
> # /etc/freeradius/3.0/mods-available/eap
> default_eap_type = peap
>
> #private_key_password = whatever
> private_key_file = ${certdir}/service.radius.key
> certificate_file = ${certdir}/service.radius.crt
>
> tls_min_version = "1.2"
>
> cache: enable = yes
> cache: name = ?<somename>.radius"
> cache: persist_dir = "${logdir}/tlscache"
>
> peap: copy_request_to_tunnel = yes
> ```
>
> ### 4.5 Configure Clients
>
> - add client for UniFi
>
> ```
> # /etc/freeradius/3.0/clients.conf
> client unifi {
> ipaddr = 10.0.1.0/24
> secret = ***
> }
> ```
>
> ### 4.6 Configure Authorization
>
> - devices/user via EAP
>
> ```
> # /etc/freeradius/3.0/sites-enabled/inner-tunnel
> post-auth {
> if (!(Ldap-Group == ?SOMEGROUP")) {
> reject
> }
> ```
>
> ### 4.7 Finish
>
> ```bash
> service freeradius restart
> ```
>
>> On Thursday, Apr 06, 2023 at 9:46 AM, Matthias K?hne | Ellerhold
Aktiengesellschaft via samba <samba at lists.samba.org (mailto:samba at
lists.samba.org)> wrote:
>> Hello Tim, Hello samba-people,
>>
>> is there an uptodate guide for authenticating via freeradius somewhere?
>>
>> I have some Ubiquiti APs plus a Cloud Key and I want to authenticate
>> WLAN clients via WPA2-Enterprise instead of a (shared) PSK.
>>
>> It seems like
>>
https://wiki.samba.org/index.php/Authenticating_Freeradius_against_Active_Directory
>> is missing some steps (basic setup of freeradius).
>>
>> Can you write up some of your findings please?
>>
>> Thanks and happy holidays,
>> Matthias.
>>
>> Am 04.04.23 um 10:38 schrieb Tim ODriscoll via samba:
>>> Dear All,
>>>
>>> Well, this is very embarrassing....
>>>
>>> It seems that running 'smbcontrol all reload-config'
isn't sufficient for reloading the ntlm config parameters.
>>>
>>> I tried restarting the whole samba service on the DC my FR box was
authenticating against (systemctl restart sernet-samba-ad) and my test laptop is
now connected to the network on the correct VLAN.
>>>
>>> I apologise for wasting everyone's time - now I'll get back
to cleaning up all the config files and making sure BYOD still works etc.
>>>
>>> Thank you,
>>>
>>> Tim
>> --
>> Senior Webentwickler
>> Datenschutzbeauftragter
>>
>> Ellerhold Aktiengesellschaft
>> Friedrich-List-Str. 4
>> 01445 Radebeul
>>
>> Telefon: +49 (0) 351 83933-61
>> Web: www.ellerhold.de
>> Facebook: www.facebook.com/ellerhold.gruppe
>> Instagram: www.instagram.com/ellerhold.gruppe
>> Twitter: https://twitter.com/EllerholdGruppe
>>
>> Amtsgericht Dresden / HRB 23769
>> Vorstand: Stephan Ellerhold, Maximilian Ellerhold
>> Vorsitzender des Aufsichtsrates: Frank Ellerhold
>>
>>
>>
>> ---Diese E-Mail und Ihre Anlagen enthalten vertrauliche Mitteilungen.
Sollten Sie nicht der beabsichtigte Adressat sein, so bitten wir Sie um
Mitteilung und um sofortiges l?schen dieser E-Mail und der Anlagen.
>>
>> Unsere Hinweise zum Datenschutz finden Sie hier:
http://www.ellerhold.de/datenschutz/
>>
>> This e-mail and its attachments are privileged and confidential. If you
are not the intended recipient, please notify us and immediately delete this
e-mail and its attachments.
>>
>> You can find our privacy policy here:
http://www.ellerhold.de/datenschutz/
>>
>>
>> --
>> To unsubscribe from this list go to the following URL and read the
>> instructions: https://lists.samba.org/mailman/options/samba
-- 
Senior Webentwickler
Datenschutzbeauftragter

Ellerhold Aktiengesellschaft
Friedrich-List-Str. 4
01445 Radebeul

Telefon: +49 (0) 351 83933-61
Web: www.ellerhold.de
Facebook: www.facebook.com/ellerhold.gruppe
Instagram: www.instagram.com/ellerhold.gruppe
Twitter: https://twitter.com/EllerholdGruppe

Amtsgericht Dresden / HRB 23769
Vorstand: Stephan Ellerhold, Maximilian Ellerhold
Vorsitzender des Aufsichtsrates: Frank Ellerhold



---Diese E-Mail und Ihre Anlagen enthalten vertrauliche Mitteilungen. Sollten
Sie nicht der beabsichtigte Adressat sein, so bitten wir Sie um Mitteilung und
um sofortiges l?schen dieser E-Mail und der Anlagen.

Unsere Hinweise zum Datenschutz finden Sie hier:
http://www.ellerhold.de/datenschutz/

This e-mail and its attachments are privileged and confidential. If you are not
the intended recipient, please notify us and immediately delete this e-mail and
its attachments.

You can find our privacy policy here: http://www.ellerhold.de/datenschutz/

Seemingly Similar Threads

Search for more maybe matching threads

samba - Apr 2023 - Fwd: ntlm_auth and freeradius

[Samba] Fwd: ntlm_auth and freeradius

[Samba] Fwd: ntlm_auth and freeradius

Seemingly Similar Threads