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6.10. Enabling legacy ciphers and algorithms in Libreswan

Enable legacy ciphers and algorithms in Libreswan for backward compatibility with other IPsec peers. This overrides the RHEL system-wide cryptographic policies which, by default, enforce strong encryption ciphers and algorithms for IPsec and Internet Key Exchange (IKE).

The RHEL system-wide cryptographic policies create a special connection called %default. This connection sets the default values for the keyexchange, esp, and ike parameters.

Prerequisites

  • Libreswan is installed.

Procedure

  1. To override the defaults set by the RHEL system-wide cryptographic policies, add the keyexchange, esp, and ike parameters to your connection configuration and set them to the values you require. For example: 

    conn <connection_name>
    keyexchange=ikev1
    ike=aes-sha2,aes-sha1;modp2048
    esp=aes-sha2,aes-sha1
    ...

  2. Restart the ipsec service: 

    # systemctl restart ipsec
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