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I want to send the DN field from the client certificate ($ssl_client_s_dn), but I want to send it encrypted.

In the question nginx append query parameter to a react application it is explained how to add a parameter to a react application using rewrite and try_files, and how to prevent the infinite rewrite redirecting loop.

But I don't know how to encrypt this variable ($ssl_client_s_dn).

My configuration file is

server { listen 9999 ssl default_server; listen [::]:9999 ssl default_server; ssl_protocols TLSv1 TLSv1.1 TLSv1.2; ssl_certificate /keystores/mycert.crt.pem; ## ssl_certificate_key /keystores/mycert.key.pem; ## ssl_client_certificate /keystores/.npm.certs.pem; ## CA Bundle ssl_verify_client on; root /home/edu/my-react-app; index index.html; server_name _; location / { try_files $uri $uri/ /index.html =404; } location = /login { if ($arg_DN = "") { rewrite ^ /login?DN=$ssl_client_s_dn redirect; } try_files /index.html =404; } } 

Any help? Thanks

1 Answer 1

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First I have used njs module, so I had to add to the top of the file /etc/nginx/nginx.conf these 2 lines:

load_module modules/ngx_http_js_module.so; load_module modules/ngx_stream_js_module.so; 

I have created a small javascript file (/etc/nginx/conf.d/njs/ximo.js) that converts the variable to Base64

function dnencrypted(r) { var dn = r.variables.ssl_client_s_dn; //get dn return btoa(dn); // convert to Base64 } export default {dnencrypted}; 

Now I have added references to this javascript file and the variable $dnencrypted in the second configuration file (/etc/nginx/conf.d/default.conf)

# 1. References to the javascript file and the variable js_path "/etc/nginx/conf.d/njs"; js_import main from ximo.js; js_set $dnencrypted main.dnencrypted; server { listen 9999 ssl default_server; listen [::]:9999 ssl default_server; ssl_protocols TLSv1 TLSv1.1 TLSv1.2; ssl_certificate /keystores/mycert.crt.pem; ## ssl_certificate_key /keystores/mycert.key.pem; ## ssl_client_certificate /keystores/.npm.certs.pem; ## CA Bundle ssl_verify_client on; root /home/edu/my-react-app; index index.html; server_name _; location / { try_files $uri $uri/ /index.html =404; } location = /login { # 2. Add the query param obtained with the variable form the javascript file if ($arg_dncncrypted = "") { rewrite ^ /login?dnencrypted=$dnencrypted redirect; } try_files /index.html =404; } } 

The obfuscation of this variable is very weak. This answer is only a general idea. Other encryption libraries must be used in order to get powerful encryption!

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