NGINX configuration for SSL Inbound Inspection

[grenzi]

Hello everybody,

  I'm trying to enable SSL Inbound Inspection to decrypt traffic to an internal webserver that runs on NGINX. I have already added the server certificate and key, and set up the corresponding decryption policy. The problem is that the firewall is not able to decrypt the traffic due to unsupported cipher, so I'm trying to force the NGINX web server to use only the PAN-OS 10 supported cipher suites.

By default, the NGINX server si configured as follows:

ssl_protocols TLSv1.2 TLSv1.3;

ssl_ciphers "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384";

PAN-OS 10 supports the following cipher suites: https://docs.paloaltonetworks.com/compatibility-matrix/supported-cipher-suites/cipher-suites-support...

anyway I'm not able to select the right combination to make the webserver and the decryption work.

Does anybody have any working NGINX configuration example?

[reaper]

ECDHE-RSA-AES128-GCM-SHA256 or DHE-RSA-AES128-GCM-SHA256 should work. try removing all the other cyphers as too many could cause conflicts that have one side give up before they can reach a desirable pair

[grenzi]

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@reaper wrote:

ECDHE-RSA-AES128-GCM-SHA256 or DHE-RSA-AES128-GCM-SHA256 should work. try removing all the other cyphers as too many could cause conflicts that have one side give up before they can reach a desirable pair

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Unfortunately I get always the same error:

Unsupported cipher. Supported client cipher bitmask: 0x00000000. Supported decrypt profile cipher bitmask: 0x04740614.

I don't know what that "bitmask: 0x00000000" means.