Difference between revisions of "Setting up RFC2307 in AD"

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= Introduction =
 
= Introduction =
  
[https://www.rfc-editor.org/rfc/rfc2307.txt RFC2307] defines the possibility to store user and group information in an LDAP directory. This brings several advantages in an Active Directory environment:
+
The use of [https://www.rfc-editor.org/rfc/rfc2307.txt RFC 2307] attributes allows the storage of Unix user and group information in an LDAP directory. In an Active Directory (AD) with Linux integration, this has several advantages:
* Central administration of IDs inside Active Directory
+
* Central administration of IDs in AD.
* Consistent IDs on all Domain Members that use idmap_ad
+
* Consistent IDs on all Linux domain members that use the Samba <code>idmap_ad</code> ID map back end.
* Fast setting of attributes: Groups only need a GID assigned, new users UID, NIS domain, login shell, home directory and primary group
+
* Fast configuration of attributes.
* Central management removes the necessity for local ID mappings, that may cause loosing file ownership if the local database corrupts
+
* No local ID mapping databases that can corrupt and lead to lose of file ownerships.
* Individual login shells and home directory paths for users
+
* Enable the administrator to set individual login shells and home directory paths for users.
* Login shell and home directory settings are the same on all Domain Members using idmap_ad with winbind nss info = rfc2307
+
* Login shell and home directory settings are the same on all domain members using Samba <code>idmap_ad</code> ID map back end and <code>winbind nss info = rfc2307</code> parameter.
* Easy [[Administer_Unix_Attributes_in_AD_via_ADUC|user/group management via Active Directory Users and Computers (ADUC)]], which is part of [[Installing RSAT|RSAT]]
+
* Easy management from Windows clients using the Active Directory Users and Computers (ADUC) Microsoft management console (MMC). For details, see [[Maintaining_Unix_Attributes_in_AD_using_ADUC|Maintaining Unix Attributes in AD using ADUC]].
  
'''See the [[Server_information_used_in_documentation|server information used in documentation]] page for paths used, hostnames, etc.'''
 
  
  
  
= Checks =
 
  
== RFC2307 enabled on all Domain Controllers ==
+
== RFC2307 on AD Domain Controllers ==
  
Check if on all Domain Controllers, the following parameter exists and is set to "yes" in the [global] section of your smb.conf:
+
On an AD DC there should only be the sysvol and netlogon shares, so the usage of unified RFC2307 id-mappings is not really important. If you want to enable RFC2307 ID mappings on the DC for whatever reason, you need to ensure that the <code>idmap_ldb:use rfc2307</code> parameter exists in the <code>[global]</code> section of your <code>smb.conf</code> file on the Samba DC and is set to <code>yes</code> :
  
 
   idmap_ldb:use rfc2307 = yes
 
   idmap_ldb:use rfc2307 = yes
  
 +
{{Imbox
 +
| type = note
 +
| text = It is not recommended using RFC2307 mappings on the DC's. The default idmap ldb mechanism is fine for domain controllers and less error prone.
 +
}}
  
  
== NIS Extensions installed inside the directory ==
 
  
Check if the "ypServ30" container exists in your directory. In this case, the NIS extensions are already installed in AD. The following command shows all attributes of the container, it it exists
 
  
  # ldbsearch -H /usr/local/samba/private/sam.ldb -s base -b CN=ypservers,CN=ypServ30,CN=RpcServices,CN=System,DC=samdom,DC=example,DC=com
+
 
 +
==  Verifying That the NIS Extensions Are Installed in Active Directory ==
 +
 
 +
Verify that the <code>ypServ30</code> LDAP tree exists in your Active Directory (AD):
 +
 
 +
  # ldbsearch -H /usr/local/samba/private/sam.ldb -s base -b \
 +
CN=ypservers,CN=ypServ30,CN=RpcServices,CN=System,DC=samdom,DC=example,DC=com cn
 +
 
 +
The output should be:
 +
 
 
  # record 1
 
  # record 1
 
  dn: CN=ypservers,CN=ypServ30,CN=RpcServices,CN=System,DC=samdom,DC=example,DC=com
 
  dn: CN=ypservers,CN=ypServ30,CN=RpcServices,CN=System,DC=samdom,DC=example,DC=com
objectClass: top
 
objectClass: container
 
 
  cn: ypservers
 
  cn: ypservers
instanceType: 4
 
whenCreated: 20140902205150.0Z
 
whenChanged: 20140902205150.0Z
 
uSNCreated: 3766
 
uSNChanged: 3766
 
showInAdvancedViewOnly: TRUE
 
name: ypservers
 
objectGUID: 10ad9cf7-0d89-4ea7-bc92-f06cc43cb951
 
objectCategory: CN=Container,CN=Schema,CN=Configuration,DC=samdom,DC=example,D
 
  C=com
 
distinguishedName: CN=ypservers,CN=ypServ30,CN=RpcServices,CN=System,DC=samdom
 
  ,DC=example,DC=com
 
 
   
 
   
 
  # returned 1 records
 
  # returned 1 records
Line 51: Line 46:
 
  # 0 referrals
 
  # 0 referrals
  
 +
If the <code>ldbsearch</code> command returns 1 record, the NIS Extensions are installed.
 +
 +
{{Imbox
 +
| type = note
 +
| text = The NIS Extensions are only required if you are going to use the ADUC Unix Attributes tabs to manage your users and groups.
 +
}}
  
  
  
  
= Setup RFC2307 and NIS Extensions in a Samba AD =
 
  
== During provisioning the first Domain Controller ==
+
== Provisioning a New Samba Active Directory with RFC2307 Enabled ==
  
Provision your domain with the "--use-rfc2307" parameter, to enable RFC2307 and install the NIS extensions.
+
When you provision a new Samba AD forest, pass the <code>--use-rfc2307</code> to the <code>samba-tool domain provision</code> command to auto-install the NIS extensions. For example:
  
 
  # samba-tool domain provision --use-rfc2307 ...
 
  # samba-tool domain provision --use-rfc2307 ...
  
 +
For details, see [[Setting_up_Samba_as_an_Active_Directory_Domain_Controller#Provisioning_a_Samba_Active_Directory|Provisioning a Samba Active Directory]].
  
 +
Additionally, enable the the Samba RFC2307 module. For details, see [[#Enabling_the_RFC2307_Configuration_Parameter|Enabling the RFC2307 Configuration Parameter]].
  
== On an already running AD ==
 
 
=== Enable RFC2307 ===
 
 
* Add the following to the [global] section of your smb.conf:
 
 
  idmap_ldb:use rfc2307 = yes
 
 
* Restart Samba
 
  
  
 +
=== Installing the NIS Extensions ===
  
=== Installing NIS extensions ===
+
Do not run this procedure if you provisioned your Active Directory (AD) with the <code>--use-rfc2307</code> parameter. For details, see [[#Provisioning_a_New_Samba_Active_Directory_with_RFC2307_Enabled|Provisioning a New Samba Active Directory with RFC2307 Enabled]].
  
'''This procedure [[Samba_AD_schema_extensions|extends your directory schema]]! This will effect your complete Active Directory Forest. Make sure that you have a recoverable [[Backup_and_restore_an_Samba_AD_DC|backup]] of your AD, in case anything fails or breaks your installation!'''
+
{{Imbox
 +
| type = warning
 +
| text = Updating the Schema can break your AD. Verify you have a working backup before updating the schema.
 +
}}
  
* You only need to do this if the first DC wasn't provisioned with "--use-rfc2307" and now need to use the NIS extensions. If unsure, see [[#NIS_Extensions_installed_inside_the_directory|if NIS Extensions are installed]]
+
To install the NIS extensions:
  
* If running multiple Domain Controllers in your AD forest, locate the [[Flexible_Single-Master_Operations_(FSMO)_roles#Schema_Master|Schema Master]]:
+
* Locate the domain controller (DC) with the <code>Schema Master</code> flexible single-master operations (FSMO) role:
  
 
  # samba-tool fsmo show | grep SchemaMasterRole
 
  # samba-tool fsmo show | grep SchemaMasterRole
 
  SchemaMasterRole owner: CN=NTDS Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samdom,DC=example,DC=com
 
  SchemaMasterRole owner: CN=NTDS Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samdom,DC=example,DC=com
  
:This indicates, that "DC1" is currently owing the Schema Master role in your forest. Continue with the next steps on this host.
+
: The output shows the name of the DC owning this role. Run all further steps on this DC.
  
* Shutdown Samba
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* Shut down the Samba service.
  
* Create a copy of "ypServ30.ldif":
+
* Create a copy of the <code>ypServ30.ldif</code> schema file. For example:
  
 
  # cp /usr/local/samba/share/setup/ypServ30.ldif /tmp/
 
  # cp /usr/local/samba/share/setup/ypServ30.ldif /tmp/
  
* Replace the variables in the LDIF file with the ones of your directory/domain:
+
* Replace the variables in copied LDIF file with the domain distinguished name (DN), NetBIOS name, and the NIS domain of your setup. For example:
 +
:*${DOMAINDN}: <code>DC=samdom,DC=example,DC=com</code>
 +
:*${NETBIOSNAME}: <code>DC1</code>
 +
:*${NISDOMAIN}: <code>samdom</code>
  
 
  # sed -i -e 's/${DOMAINDN}/<u>DC=samdom,DC=example,DC=com</u>/g' \
 
  # sed -i -e 's/${DOMAINDN}/<u>DC=samdom,DC=example,DC=com</u>/g' \
Line 103: Line 103:
 
           /tmp/ypServ30.ldif
 
           /tmp/ypServ30.ldif
  
* Import the schema:
+
* Import the modified LDIF file to the local <code>/usr/local/samba/private/sam.ldb</code> Samba AD database:
  
 
  # ldbmodify -H /usr/local/samba/private/sam.ldb /tmp/ypServ30.ldif --option="dsdb:schema update allowed"=true
 
  # ldbmodify -H /usr/local/samba/private/sam.ldb /tmp/ypServ30.ldif --option="dsdb:schema update allowed"=true
 
  Modified 55 records successfully
 
  Modified 55 records successfully
  
* Start Samba
+
* Start the Samba service.
 +
 
 +
The AD replicates the updated schema to all DCs in the forest.
 +
 
 +
 
 +
 
 +
 
  
* The directory replication pushes the new schema automatically to all Domain Controllers inside the forest
+
----
 +
[[Category:Active Directory]]

Latest revision as of 16:53, 21 December 2020

Introduction

The use of RFC 2307 attributes allows the storage of Unix user and group information in an LDAP directory. In an Active Directory (AD) with Linux integration, this has several advantages:

  • Central administration of IDs in AD.
  • Consistent IDs on all Linux domain members that use the Samba idmap_ad ID map back end.
  • Fast configuration of attributes.
  • No local ID mapping databases that can corrupt and lead to lose of file ownerships.
  • Enable the administrator to set individual login shells and home directory paths for users.
  • Login shell and home directory settings are the same on all domain members using Samba idmap_ad ID map back end and winbind nss info = rfc2307 parameter.
  • Easy management from Windows clients using the Active Directory Users and Computers (ADUC) Microsoft management console (MMC). For details, see Maintaining Unix Attributes in AD using ADUC.



RFC2307 on AD Domain Controllers

On an AD DC there should only be the sysvol and netlogon shares, so the usage of unified RFC2307 id-mappings is not really important. If you want to enable RFC2307 ID mappings on the DC for whatever reason, you need to ensure that the idmap_ldb:use rfc2307 parameter exists in the [global] section of your smb.conf file on the Samba DC and is set to yes :

 idmap_ldb:use rfc2307 = yes



Verifying That the NIS Extensions Are Installed in Active Directory

Verify that the ypServ30 LDAP tree exists in your Active Directory (AD):

# ldbsearch -H /usr/local/samba/private/sam.ldb -s base -b \
CN=ypservers,CN=ypServ30,CN=RpcServices,CN=System,DC=samdom,DC=example,DC=com cn

The output should be:

# record 1
dn: CN=ypservers,CN=ypServ30,CN=RpcServices,CN=System,DC=samdom,DC=example,DC=com
cn: ypservers

# returned 1 records
# 1 entries
# 0 referrals

If the ldbsearch command returns 1 record, the NIS Extensions are installed.



Provisioning a New Samba Active Directory with RFC2307 Enabled

When you provision a new Samba AD forest, pass the --use-rfc2307 to the samba-tool domain provision command to auto-install the NIS extensions. For example:

# samba-tool domain provision --use-rfc2307 ...

For details, see Provisioning a Samba Active Directory.

Additionally, enable the the Samba RFC2307 module. For details, see Enabling the RFC2307 Configuration Parameter.


Installing the NIS Extensions

Do not run this procedure if you provisioned your Active Directory (AD) with the --use-rfc2307 parameter. For details, see Provisioning a New Samba Active Directory with RFC2307 Enabled.

To install the NIS extensions:

  • Locate the domain controller (DC) with the Schema Master flexible single-master operations (FSMO) role:
# samba-tool fsmo show | grep SchemaMasterRole
SchemaMasterRole owner: CN=NTDS Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samdom,DC=example,DC=com
The output shows the name of the DC owning this role. Run all further steps on this DC.
  • Shut down the Samba service.
  • Create a copy of the ypServ30.ldif schema file. For example:
# cp /usr/local/samba/share/setup/ypServ30.ldif /tmp/
  • Replace the variables in copied LDIF file with the domain distinguished name (DN), NetBIOS name, and the NIS domain of your setup. For example:
  • ${DOMAINDN}: DC=samdom,DC=example,DC=com
  • ${NETBIOSNAME}: DC1
  • ${NISDOMAIN}: samdom
# sed -i -e 's/${DOMAINDN}/DC=samdom,DC=example,DC=com/g' \
         -e 's/${NETBIOSNAME}/DC1/g' \
         -e 's/${NISDOMAIN}/samdom/g' \
         /tmp/ypServ30.ldif
  • Import the modified LDIF file to the local /usr/local/samba/private/sam.ldb Samba AD database:
# ldbmodify -H /usr/local/samba/private/sam.ldb /tmp/ypServ30.ldif --option="dsdb:schema update allowed"=true
Modified 55 records successfully
  • Start the Samba service.

The AD replicates the updated schema to all DCs in the forest.