One Identity Safeguard for Privileged Sessions 6.0 LTS - Administration Guide

Extracting username from Telnet connections

For specific devices, it is now possible to extract the username from Telnet connections with the help of patterns (including TN3270 and TN5250 systems).

To select patterns or request a custom pattern

1. Navigate to Telnet Control > Authentication Policies and enable Extract username from the traffic.

2. Click Select target devices to display the list of available target devices. Select the respective device(s) in the Available devices column and click Add.

   NOTE: You can only add one TN3270 specific device to the authentication policy.

   To remove a device from the Target devices column, select it and click Remove.

3. Click OK. The target devices are listed after Selected devices.

4. If you cannot find your device in the list of available target devices, request a custom Pattern Set. To do this, contact our Support Team.

5. To upload the custom pattern set you received, navigate to Telnet Control > Pattern Sets, browse for the file and click Upload.

6. To delete a custom Pattern Set from One Identity Safeguard for Privileged Sessions (SPS), click in the respective row. Generic Pattern Sets cannot be deleted.

Creating and editing protocol-level Telnet settings

Procedure

Telnet settings determine the parameters of the connection on the protocol level, including timeout value, and so on. Complete the following procedure to create a new Telnet settings profile or edit an existing one:

To create and edit protocol-level Telnet settings

1. Navigate to the Settings tab of the Telnet Control menu item and click to create a Telnet setting profile. Enter a name for the profile (for example telnet_special).

2. Click to display the parameters of the connection.

3. Modify the parameters as needed. The following parameters are available:

   • Idle timeout: Timeout value for the connection in milliseconds. To avoid early timeout, set it to a larger value, for example a week (604800000 milliseconds).

     Caution: Determining if a connection is idle is based on the network traffic generated by the connection, not the activity of the user. For example, if an application or the taskbar of a graphical desktop displays the time which is updated every minute, it generates network traffic every minute, negating the effects of timeout values greater than one minute and preventing One Identity Safeguard for Privileged Sessions (SPS) from closing the connection.

   • Enable pre channel check: Select this option to evaluate the connection and channel policies before establishing the server-side connection. That way if the connection is not permitted at all, SPS does not establish the server-side connection.

   • To configure TLS security settings on both the Client side and the Server side, proceed to TLS security settings.

     Figure 197: <Protocol> Control > Settings > TLS security settings - configuring TLS security settings

     

     • Cipher strength specifies the cipher string OpenSSL will use. The following settings options are possible:

       • Recommended: this setting only uses ciphers with adequate security level.

       • Custom: this setting allows you to specify the list of ciphers you want to permit SPS to use in the connection. This setting is only recommended in order to ensure compatibility with older systems. For more details on customizing this list, check the 'openssl-ciphers' manual page on your SPS appliance.

     • Minimum TLS version specifies the minimal TLS version SPS will offer during negotiation. The following settings options are possible:

       • TLS 1.2: this setting will only offer TLS version 1.2 during negotiation. This is the recommended setting.

       • TLS 1.1: this setting will offer TLS version 1.1 and later versions during negotiation.

       • TLS 1.0: this setting will offer TLS version 1.0 and later versions during negotiation.

     NOTE: Note that SPS only permits TLS-encrypted connections. SSLv3 is not supported.

4. Click .

5. To display a banner message to the clients before authentication, enter the message into the Banner field. For example, this banner can inform the users that the connection is audited.

6. Select this settings profile in the TELNET settings field of your connections.

Inband destination selection in Telnet connections

When using inband destination selection in Telnet connections, the user can provide the server address and the username using the following methods:

• By setting the TELNET ENVIRON option using the SERVER environment variable in the server:port format.

• By setting the TELNET ENVIRON option using the USER environment variable in the user@server:port format.

• If neither the SERVER nor the USER environment variable, One Identity Safeguard for Privileged Sessions (SPS) displays a terminal prompt where the user can enter the username and the server address.

Limitations of using TN5250 protocol with IBM iSeries Access for Windows

Using the TN5250 protocol with IBM iSeries Access for Windows is not supported in non-transparent mode if the client tries to set up all its connections using One Identity Safeguard for Privileged Sessions's (SPS's) IP addresses (for example, when both the client and SPS are within the same zone and the firewall is behind SPS). This is problematic in the case of an IBM iSeries Access for Windows client, which initiates administrative communication with components other than the Telnet server itself. Bypassing non-audited traffic goes against the purpose of non-transparent mode.

Possible workarounds:

• Use a local service file instead of active client-server communication.

• Use transparent mode.

• Use single-interface transparent mode and policy-based routing.