One Identity Safeguard for Privileged Sessions 7.1.1

For SSH, RDP, Telnet, and Citrix ICA connections, usermapping policies can be defined. A usermapping policy describes who can use a specific username to access the remote server: only members of the specified local or LDAP usergroups (for example, administrators) can use the specified username (for example, root) on the server.

Caution:

In SSH connections, the users must use the following as their username: gu=username@remoteusername, where username is the username used in the LDAP directory, SPS will use this username to determine their group memberships, and remoteusername is the username they will use on the remote server. For example, to access the example.com server as root, use:

gu=yourldapusername@root@example.com

For the username of SSH users, only valid UTF-8 strings are allowed.

Caution:

In Telnet connections, usermapping policy works only if Extract username from the traffic is enabled.

For more information, see Extracting username from Telnet connections.

When configuring ICA connections, also consider the following:

Caution:

If the clients are accessing a remote application or desktop that is shared for Anonymous users (that is, the Users properties of the application is set to Allow anonymous users in the Citrix Delivery Services Console), the actual remote session will be running under an Anonymous account name (for example, Anon001, Anon002, and so on), not under the username used to access the remote server. Therefore, you need to enable usermapping to the Anon* usernames.

To accomplish this, create a usermapping policy and set the Username on the server option to Anon*, and the Groups option to *, then use this usermapping policy in your ICA connections.

For more information on using usermapping policies, see Configuring usermapping policies.

NOTE: Starting from SPS version 3.2, usermapping is possible only when gateway authentication is used as well.

To configure usermapping

Navigate to Policies > Usermapping Policies.

Figure 326: Policies > Usermapping Policies — Configuring usermapping policies
Click to create a new policy, and enter a name for the policy.
Click and enter the username that can be used to access the remote server (for example root) into the Username on the server field. SPS will use this username in the server-side connection. To permit any username on the server side, enter an asterisk (*).
Select Groups, click and specify who is permitted to use the remote username set in the Username on the server field.
- If you have an LDAP Server set in the connection policy where you will use usermapping, enter the name of the local or LDAP usergroup (for example admins) whose members will be permitted to use the remote username.
  
  For more information on LDAP authentication, see Authenticating users to an LDAP server.
  
  NOTE: The LDAP server configured in the connection policy is not necessarily the same as the LDAP server used to authenticate the users accessing the SPS web interface.
- If you do not authenticate the connections to an LDAP server, enter the name of the userlist whose members will be permitted to use the remote username.
  
  For more information on using userlists, see Creating and editing user lists.
Repeat this step to add further groups if needed.
Repeat steps 3-4 to add further usernames if needed.
To permit other users, who are not explicitly listed in the Usermapping Policy access the remote servers, select the Allow other unmapped usernames option. Note that these users must use the same username on the SPS gateway and the remote server.
Click .
Navigate to the Connections page of the traffic (for example to SSH Control > Connections), and select the connection policy to modify.
Select the usermapping policy created in Step 2 from the Usermapping policy field.
Click .

NOTE: For RDP connections, usermapping is possible only when gateway authentication is used as well. When configuring usermapping for RDP connections, configure gateway authentication.

For more information, see Configuring out-of-band gateway authentication.

Configuring gateway authentication

When gateway authentication is required for a connection, the user must authenticate on One Identity Safeguard for Privileged Sessions (SPS) as well. This additional authentication can be performed:

Out-of-band, on the SPS web interface, for every protocol.
Inband, using the incoming connection, for the SSH, Telnet, and RDP protocols.

For details about the concepts of gateway authentication, see The gateway authentication process. You can use gateway authentication to authenticate the real person when the user is using a shared account to access the target server.

NOTE: For SSH, Telnet, and RDP connections, gateway authentication can be performed also inband, without having to access the SPS web interface.

For SSH and Telnet connections, inband gateway authentication must be performed when client-side authentication is configured. For details on configuring client-side authentication, see Client-side authentication settings.
For RDP connections, inband gateway authentication must be performed when SPS is acting as a Remote Desktop Gateway (or RD Gateway). In this case, the client authenticates to the Domain Controller or a local user database. For details, see Using One Identity Safeguard for Privileged Sessions (SPS) as a Remote Desktop Gateway.

In the case of RDP connections, inband gateway authentication can also be performed if an AA plugin is configured.

NOTE: Gateway authentication can be used together with other advanced authentication and authorization techniques like four-eyes authorization, client- and server-side authentication, and so on.

Caution:

If the username used within the protocol to access the remote server is different from the username used to perform gateway authentication (for example, because the user uses a shared account in the remote server, but a personal account for gateway authentication), usermapping must be configured for the connection. For details on usermapping, see Configuring usermapping policies.

NOTE: To configure a credential store for gateway authentication, see Using credential stores for server-side authentication.

Topics:

Configuring out-of-band gateway authentication

Performing out-of-band gateway authentication on One Identity Safeguard for Privileged Sessions (SPS)

Performing inband gateway authentication in SSH and Telnet connections

Performing inband gateway authentication in RDP connections

Troubleshooting gateway authentication

Configuring out-of-band gateway authentication

Caution:

The admin user is a special One Identity Safeguard for Privileged Sessions (SPS) user and not a member of any user groups, nor can it belong to any group. Since usermapping policies are based on user groups, performing gateway authentication with the admin user is likely to result in usermapping errors.
When using SSL-encrypted RDP connections, or connections that use the Credential Security Service Provider (CredSSP) authentication method, some Microsoft RDP clients restart the connection during the authentication process. This would require the user to perform gateway authentication on the SPS web interface twice. To avoid this situation, SPS temporarily caches the successful gateway authentication results if the client terminates the connection at a certain step while establishing the connection. The cache is used to automatically authenticate the restarted connection without user interaction.

In this case, the restarted connection coming from the same source IP and targeting the same destination IP:port pair will be authenticated from the cache. The cache is deleted after three minutes, or when a connection is authenticated from the cache.

However, caching the authentication results has the following side-effect: if a different connection targets the same destination IP:port pair from seemingly the same source IP address within the brief period when SPS expects the original connection to be re-established, the new connection can access the target server without having to authenticate on the SPS gateway. Normally, this can occur only if the clients are behind a NAT.
If the clients are behind a device that performs network address translation (NAT), it will seem to SPS as if every connection was initiated from the same IP address. Therefore, in such cases using out-of-band gateway authentication is not recommended for security reasons, especially for RDP connections. If possible, use inband gateway authentication instead.

To configure gateway authentication

Navigate to the Connections page of the traffic (for example to SSH Control > Connections), and select the connection policy to modify.
Select the Require Gateway Authentication on the SPS Web Interface option. This is the option to configure gateway authentication via the web interface of SPS.

Figure 327: <Protocol name> Connections > Require Gateway Authentication on the SPS Web Interface — Configuring gateway authentication
To accept the gateway authentication only from the host that initiated the connection, select Require same IP.

NOTE: This option has no effect if the clients are behind a device that performs network address translation (NAT). In such cases, use inband gateway authentication instead.
By default, any user can perform gateway authentication for the connections. To allow only members of a specific group authenticate the connections of this connection policy, select Groups, click and enter the name of the group whose members can authenticate the connections. This group must exist on the Users & Access Control > Local User Groups page. For details on creating and managing usergroups, see Managing user rights and usergroups. Repeat this step to add further groups if needed.
For SSH, RDP, Telnet and Citrix ICA connections, you may want to set a usermapping policy in the Usermapping policy field. For details on usermapping policies, see Configuring usermapping policies.
Click . After that, users accessing these connections must perform gateway authentication as described in Performing out-of-band gateway authentication on One Identity Safeguard for Privileged Sessions (SPS).
(Optional) To restrict the availability of selected channels of the connection based on the username used for gateway authentication, edit the channel policy used in the connection.
1. Navigate to the channel policy used in the connection (for example, SSH Control > Channel Policies).
2. Select Gateway Group, click and enter the name of the user group allowed to use this type of the channel. The user group must correspond to the username used for the gateway authentication. Repeat this step until all permitted groups are listed.
  
  You may list local user lists as defined in Creating and editing user lists, or LDAP groups (for details on accessing LDAP servers from SPS, see Authenticating users to an LDAP server). Note the following behavior of SPS:
  - If you list multiple groups, members of any of the groups can access the channel.
    
    NOTE: When listing both a whitelist and blacklist in the Gateway Group section and a username appears on both lists, the user will be able to access the channel.
  - If a local user list and an LDAP group has the same name and the LDAP server is configured in the connection that uses this channel policy, both the members of the LDAP group and the members of the local user list can access the channel.
3. Click .

(Optional) If you want to provide a limited SPS web interface to your users that can be used only for gateway authentication and 4-eyes authorization, set up a dedicated user-only web login address. For details, see Configuring user and administrator login addresses.

(Optional) You can configure a message for users accessing SPS for out-of-band authentication. The message is displayed when they log in to SPS.
1. Navigate to Basic Settings > Management > Web gateway authentication.
2. Select Enable web gateway authentication banner.
  
  Figure 328: Basic Settings > Management > Web gateway authentication — Configuring a banner
3. Enter the message in the Banner field. You can use the following text formatting options:
```
== Title ==
=== Subtitle ===

This is plain text.
[http://address.to/ Link text]

# First numbered list item.
# Second numbered list item.

* First bulleted list item.
* Second bulleted list item.
```
4. Click .
(Optional) If your users have sessions to several remote server, or access a server several times a day, performing the gateway authentication for every session can be a nuisance. To permit your users to authenticate on the SPS web interface once, and open sessions without repeating the gateway authentication, select Enable auto-assign and click . Note that the user must leave the browser window (or tab) of SPS open.

One Identity Safeguard for Privileged Sessions 7.1.1 - Administration Guide

Advanced authentication and authorization techniques

Configuring usermapping policies

Configuring gateway authentication

Topics:

Configuring out-of-band gateway authentication

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One Identity Safeguard for Privileged Sessions 7.1.1 - Administration Guide

Advanced authentication and authorization techniques

Configuring usermapping policies

Configuring gateway authentication

Topics:

Configuring out-of-band gateway authentication