Yes, you can decrypt on the ALB to perform any URI-based policy or insert the XFF. You can choose to keep the traffic decrypted behind the ALB and the firewall will see the clear text traffic or reencrypt on the ALB and use inbound SSL decryption. Typically you would use the same cert for the ALB, backend, and firewall. At the time of this posting, the ALB does not care about mismatched certs so you could actually use a self-signed cert on the firewall.
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