Difference between revisions of "Generic LDAP Integration"
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Revision as of 14:57, 22 April 2021
In addition to adding users manually as described in chapter User Management, MailStore Server can synchronize its internal user database with the LDAP server of your organization.
During synchronization, user information, such as user names and email addresses, is copied from the LDAP server into MailStore Server's user database. That way, users can use their LDAP server credentials to also log on to MailStore Server and emails can be assigned to their corresponding user archives automatically, for example. No changes are made to the LDAP server itself by MailStore Server. The scope of the synchronization can be limited through filters.
Accessing Directory Service Integration
- Log on to MailStore Client as a MailStore Server administrator.
- Click on Administrative Tools > Users and Archives > Directory Services.
- In the Integration section, change the directory service type to LDAP server.
Connection to the LDAP Directory Service
For synchronization MailStore Server requires information on how to connect to the LDAP directory service and how to obtain the required data from it.
LDAP Connection
| Name | Description |
|---|---|
| Server Name | DNS name or IP address of your LDAP server |
| Protocol | Configure whether the connection to the LDAP server is to be unencrypted on port 389, LDAP-TLS on port 389, or LDAP-SSL on port 636 |
| Accept all certificates (only when using LDAP-TLS or LDAP-SSL) | If the certificate provided by the remote host cannot be verified (e.g. self-signed or signed by an unknown certificate authority), enable the option Accept all certificates to allow MailStore to establish a connection. As this option leads to an insecure configuration, warnings may appear in the summary and/or the dashboard. |
| Administrative DN | Distinguished Name (DN) or user name of a user with appropriate privileges on the LDAP server |
| Password | Password of the user specified in Administrative DN |
| Base DN | LDAP base DN, if needed |
User Filter and Attributes
| Name | Description |
|---|---|
| Filter (optional) | Filter LDAP objects to return only user objects with email addresses |
| User Name | The LDAP attribute containing the username that you wish MailStore to use |
| Local Part Only (E-mail Addresses / UPN) | If unchecked, MailStore will use the full username including domain portion, e.g. [email protected]. If checked, MailStore will only use the local part of the User Name specified, e.g. the username |
| Full Name (optional) | The full name of the user, for display purposes within MailStore |
| E-mail Addresses (opt.) | The LDAP attribute containing the user's email address. This can contain multiple, comma separated, e-mail addresses |
Group Filter and Attributes
| Name | Description |
|---|---|
| Filter | LDAP filter to return only group objects |
| Name | The LDAP attribute that contains the common name of a group |
| Description (optional) | The LDAP attribute that contains a human readable description for each group |
| Members | The LDAP attribute that contains the common name of group members |
| Search Filter for Members | LDAP filter to resolve group members when members are not specified as a DN string as part of the group results. MailStore will fill in the {member} variable with values from the Members attribute |
| Group | The actual group(s) containing users that MailStore Server will synchronize |
Authentication
- Method
Here you can choose how users that have been synchronized from LDAP server will be authenticated.- LDAP
With this option, users can log on directly to MailStore Server with their LDAP server credentials. The provided credentials are relayed by MailStore Server to LDAP server for verification. - AD FS (OpenID Connect)
If your company employs Active Directory Federation Services (AD FS), users can also log on to MailStore Server using OpenID Connect through AD FS. For this, you have to configure your AD FS according to our setup guide and enter the following parameters in MailStore Server afterwards.- Discovery URI
The URI by which the AD FS are reachable. Typically, this is the fully qualified domain name of the AD FS server followed by the path /adfs, e.g. https://adfs.example.com/adfs. The certificate used by the AD FS must be trusted. - Client ID
The Client Identifier of the Application Group that has been created for MailStore Server in AD FS. - Redirect-URI
The Redirect-URI that has been configured in the Application Group. - Always require credentials for login
If this option is enabled, users must authenticate against AD FS everytime they log on to MailStore Server.
- Discovery URI
- Please note: When using OpenID Connect to authenticate users, accessing the archive via IMAP is not possible for technical reasons.
- LDAP
Options
- Automatically delete users in MailStore Server
Here you can choose whether users that have been deleted in the the LDAP server will also be deleted in the MailStore Server user database by the synchronization. Users will also be deleted if they fall out of scope of the configured settings.
Only MailStore Server users that have their authentication method set to Directory Services will be deleted.
If the archive folder of such a user already contains archived emails, only the user entry but not its archive folder will be deleted in MailStore Server.
Assigning Default Privileges
By default, users that have been synchronized to MailStore Server from a directory service have the privilege to log on to MailStore Server as well as read access to their own user archive.
You can configure those default privileges before synchronization, for example, to assign the privilege Archive E-mail to all new users. To do this, click on Default Privileges...
More information on managing user privileges and their effects is available in the chapter Users, Folders and Settings which also has details on editing existing privileges.
Configuration Samples
Active Directory
It is possible to connect LDAP Generic to Active Directory, allowing for more flexibility and control than MailStore's built-in Active Directory support. For example, LDAP Generic will allow you to accept invalid or self-signed certificates when using LDAP-SSL or LDAP-TLS, use custom filters or change which attributes are used by MailStore.
It is assumed that the Active Directory LDAP service is reachable by the MailStore instance on TCP port 389 or 636, including opening ports in the firewall, where applicable.
As most Active Directory configurations are quite similar, it will be possible to copy/paste most of the examples below, making only minor modifications based on your environment.
LDAP Connection
| Name | Value | Description |
|---|---|---|
| Server Name | dc001.example.com | DNS name or IP address of an Active Directory domain controller. |
| Protocol | LDAP | Do not use transport encryption |
| LDAP-TLS | Use TLS as transport encryption | |
| LDAP-SSL | Use SSL as transport encryption | |
| Accept all certificates | Enabled | Establish a TLS/SSL encrypted connection, even if the certificate validation failed. |
| Disabled | Do not establish a TLS/SSL encrypted connection, if the certificate validation failed. | |
| Administrative DN | [email protected] | Active Directory account for MailStore's use |
| Password | MySecretPassword | Password of the user specified in Administrative DN above |
| Base DN | Empty | LDAP base DN will be detected automatically in Active Directory environments |
User Filter and Attributes
| Name | Value | Description |
|---|---|---|
| Filter (optional) | (objectCategory=User) | All users |
| (&(objectCategory=User)(mail=*)) | All users with Active Directory e-mail addresses | |
| (&(objectCategory=User)(proxyAddresses=*)) | All users with Exchange e-mail addresses | |
| (&(objectCategory=User)(proxyAddresses=*)(mail=*)) | All users with Exchange e-mail addresses who are also listed in the global address book | |
| User Name | userPrincipalName | Use Active Directory user name as MailStore user name |
| sAMAccountName | Use pre-Windows 2000 user name as MailStore user name | |
| Local Part Only (E-mail Addresses / UPN) | Enabled | Only use the local part from the Active Directory user name in UPN format |
| Disabled | Use the full Active Directory user name in UPN format | |
| Full Name (optional) | displayName | The user's visible name in Active Directory |
| E-mail Addresses (opt.) | proxyAddresses | Exchange environments |
| Non-Exchange environments |
Group Filter and Attributes
| Name | Value | Description |
|---|---|---|
| Filter | (objectCategory=Group) | All objects of category Group, usually all groups |
| Name | cn | Use the value of the LDAP attribute CN as group name |
| Description (optional) | description | Use the value of the LDAP attribute description as group name |
| Members | member | Use the value LDAP attribute member to determine group members |
| Search Filter for Members | emtpy | Group members are returned as Distinguished Names |
| Group | MailStore Users | Synchronize only users from the MailStore Users group |
OpenLDAP
OpenLDAP is a commonly used LDAP server, configuration will require some knowledge of your LDAP environment.
It is assumed that the LDAP service is reachable by the MailStore instance on TCP port 389 or 636, including opening ports in the firewall, where applicable.
As OpenLDAP is very flexible, configuration options vary from server to server and you may need to make significant modifications to the examples below to fit the schema used in your environment.
LDAP Connection
| Name | Value | Description |
|---|---|---|
| Server Name | directory.example.com | DNS name or IP address of the OpenLDAP server. |
| Protocol | LDAP | Do not use transport encryption |
| LDAP-TLS | Use TLS as transport encryption | |
| LDAP-SSL | Use SSL as transport encryption | |
| Accept all certificates | Enabled | Establish a TLS/SSL encrypted connection, even if the certificate validation failed. |
| Disabled | Do not establish a TLS/SSL encrypted connection, if the certificate validation failed. | |
| Administrative DN | cn=admin,dc=example,dc=com | LDAP username that MailStore should use for accessing the OpenLDAP server |
| Password | MySecretPassword | Password of the user specified in Administrative DN above |
| Base DN | dc=example,dc=com | The Base-DN of the LDAP directory |
User Filter and Attributes
| Name | Value | Description |
|---|---|---|
| Filter (optional) | (objectClass=posixAccount) | All objects of type posixAccount, usually all users |
| (&(objectClass=posixAccount)(mail=*)) | All users with configured email address | |
| User Name | uid | Use the value of LDAP attribute UID as MailStore user name |
| cn | Use the value of LDAP attribute CN as MailStore user name | |
| Local Part Only (E-mail Addresses / UPN) | Enabled | Only use the local part from a user name in UPN format |
| Disabled | Use the full user name in UPN format | |
| Full Name (optional) | displayName | Use the value of LDAP attribute displayName as MailStore user name |
| E-mail Addresses (opt.) | Use the values of LDAP attribute mail for the email addresses of MailStore users |
Group Filter and Attributes
| Name | Value | Description |
|---|---|---|
| Filter | (objectClass=posixGroup) | All objects of category posixGroup, usually all groups |
| Name | cn | Use the value of the LDAP attribute CN as group name |
| Description (optional) | description | Use the value of the LDAP attribute description as group name |
| Members | member | Use the value LDAP attribute member to determine group members |
| Search Filter for Members | emtpy | Group members are returned as Distinguished Names |
| (|(&(objectClass=posixAccount)(uid={member}))(&(objectClass=posixGroup)(cn={member}))) | members in memberUid are only given as plain user or group names | |
| Group | MailStore Users | Synchronize only users from the MailStore Users group |
Running Directory Services Synchronization
Click on Test Settings to check synchronization configuration and the results returned by the directory service without any changes to the MailStore Server user database being actually committed.
To finally run the synchronization, click on Synchronize now. The results are shown with any changes committed to the MailStore Server user database.
You can test the authentication for a user by first selecting him from the list and then clicking on the button on the lower left. You will now be asked for that user's password. Upon clicking OK you'll receive a message whether the authentication has been successful.
Login with LDAP server Credentials
After synchronization MailStore users can log on to MailStore Server with their LDAP server username and LDAP server password.
