Connecting to an external LDAP directory

The external LDAP is a directory to which your Stormshield Network multi-function firewall will connect.

Step 1: Selecting the directory

Select the LDAP base of your choice. This is the first step in the configuration of this directory.

Select the option Connect to an external LDAP directory and click on Next.

Step 2: Accessing the directory

Domain name Name that identifies the internal LDAP directory when several directories are defined on the firewall. In a configuration containing multiple directories, this name will be needed in addition to the user's login for authentication (login@domain_name). You are therefore strongly advised to enter a DNS domain name in this field.

EXAMPLE
company.com

Server Select an object corresponding to your LDAP server from the drop-down list. This object must be created prior to this step and must reference the IP address of your LDAP server.
Port Enter the listening port of your LDAP server. The default port is: 389.
Root domain (Base DN) Enter the root domain (DN) of your directory. The DN represents the name of an entry, in the form of a path to it, from the top to the bottom of the tree structure. The field can be entered using the name of the Root Domain (DN).

EXAMPLE
The LDAP domain is “company.com” so my Root domain (Base DN) should be “dc=company,dc=com”

Read-only access If this option is selected, you will not be able to perform any actions in write mode on the external LDAP directory.
Anonymous connection This option makes it possible to log on to the external LDAP directory without entering any username or password. The LDAP server must of course authorize anonymous connections.
If this option is selected, the fields Username and Password will become inactive (grayed out).
Identifier An administrator account allowing the firewall to connect to your LDAP server and make changes (reading and writing privileges) to certain fields.
We recommend that you create a specific account for the firewall and assign privileges to it only in the necessary fields.

EXAMPLE
cn=id

This field will be inactive when the Anonymous connection checkbox has been selected.
Password The password associated with the ID for you to connect to the LDAP server.
The key icon () allows you to view the password in plaintext to check that it is correct.
This field will be inactive when the Anonymous connection checkbox has been selected.

Click on Finish to display the external LDAP directory screen.

External LDAP directory screen

Once the configuration of the LDAP directory is complete, you will arrive at the external LDAP screen which sets out the following items:

“Configuration” tab

The page that appears presents a window that summarizes the information entered for your external LDAP and various services concerning access to your directory.

Remote directory

Enable user directory This option allows you to start the LDAP service.
If this option is not selected, the module will be inactive.
Server This field contains the name of the server that you entered in the previous page.
Port This field contains the listening port that you selected in the previous page.
Root domain (Base DN) The root domain of your directory as it was defined when it was created.

EXAMPLE
dc=company,dc=org

Identifier The login name allowing the firewall to connect to your LDAP server.
Password The password created in the firewall to connect to the LDAP server.

Secure connection (SSL)

Enable SSL access This option makes it possible to check your digital certificate generated by the firewall’s root CA.
Information is encrypted in SSL. This method uses port 636.
Public access to the LDAP is protected by the SSL protocol.

NOTE
If this option is not selected, access will not be encrypted.

Check the certificate against a certification authority During a connection to the LDAP database, the firewall will check that the certificate was issued by the certification authority specified below.
Certification authority This option allows you to select the CA that will be used to verify the server certificate issued by the LDAP server, to guarantee the authenticity of the connection to this server.
Click on the magnifying glass icon to search for the corresponding CA.

NOTE
This option will be grayed out by default if the previous option Check that the name of the server matches the FQDN in the SSL certificate was not selected.

 

Advanced properties

Backup server This field makes it possible to define a replacement server if the main server cannot be reached. You can select it from the list of objects suggested in the drop-down list.
Port Enter the listening port of your backup LDAP server,
which may be different from the listening port on the main server.
The default port is: 389 (ldap).
Use the firewall account to check user authentication on the directory When this option is selected, the firewall will use the identifier declared during the creation of the directory to verify a user's privileges with the LDAP server when the user authenticates.
Otherwise, the firewall will use the user's account to conduct this check.

Click on Apply to confirm your configuration.

“Structure” tab

Read-only access

User selection filter When using the firewall in interaction with an external database, only users that correspond to the filter will be used. By default this filter corresponds to ObjectClass = InetOrgPerson.
User group selection filter When using the firewall in interaction with an external database, only user groups that correspond to the filter will be used. By default this filter corresponds to ObjectClass = GroupOfNames.

You are accessing the directory in read-only mode. The creation of users and groups will not be allowed: If this option is selected, you will not be able to perform any actions in write mode.

Mapped attributes

Apply a model: This button offers to apply one of three LDAP servers to define your attributes:

  • OpenLDAP: LDAP server.
  • Microsoft Active Directory (AD): LDAP directory services for Windows operating systems.
  • Open Directory: directory of websites under an Open Directory license
 
External directory attributesThis column represents the value given to the attribute in the external directory.

EXAMPLES
Cn= COMPANY
telephoneNumber= +33 (0)3 61 96 30
mail = salesadmin@company.com

Advanced properties

Password hash: The password encryption method for new users.

Some authentication methods (such as LDAP) must store the user’s password in the form of a hash (result of a hash function applied to the password) which prevents the password from being stored in plaintext.

 

You must select your desired hash method from the following:

SHA“Secure Hash Algorithm”. This encryption method makes it possible to set up a 160-bit or 160-byte character string (called a “key”) which will be used as a reference for identification.
MD5“Message Digest”. This algorithm allows you to check the integrity of data entered, by generating a 128-bit MD5 key.

REMARK
As this method uses fewer bytes and as such has a lower level of security, it is less robust against attacks.

SSHA“Salt Secure Hash Algorithm”. Based on the same principle as SHA, but contains a password salting function in addition, which consists of adding a bit sequence to the data entered in order to make them less legible.

NOTE
This variant of SHA uses a random value to diversify the password’s fingerprint. Two identical passwords will therefore have two different fingerprints.


The encryption method is the most secure and strongly recommended.
SMD5“Salt Message Digest”. Based on the same principle as MD5, with the addition of the password salting function.
CRYPTThe password is protected by the CRYPT algorithm, derived from the DES algorithm which allows block encryption using 56-bit keys.
This method is not highly advised, as it has a relatively low level of security.
NoneNo password encryption, meaning it is stored in plaintext.

WARNING
This method is not recommended, as your data will not be protected.

 

User branchEnter the name of the LDAP branch for storing users.

EXAMPLE
ou=users

Group branch

Enter the name of the LDAP branch for storing user groups.

EXAMPLE
ou=groups

Certification authority branchThis field defines the location of the CA on the external LDAP base. This location is used especially when searching for the CA used in SSL.

NOTE
This field does not necessarily need to be configured but in this case, in order for the SSL authentication method to work, the CA must be specified in the list of trusted CAs in the configuration of the SSL method (see Users > Authentication module > Available methods tab: the authentication method Certificate (SSL) must be added and the CA indicated in the right column “Certification authorities (C.A)”).

Click on Apply to confirm your configuration.