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I am reading the ngnix client certificate and storing it in a local variable.

local client_cert = openssl_x509.new(ngx.var.ssl_client_raw_cert)
local subject = client_cert:getSubject()

I need to get the common name from the subject, how can I get it?

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  • Which module are you using for openssl_x509.new? What's the functionality of getSubject()? Commented Apr 29, 2019 at 13:35
  • I am using local openssl_x509 = require "openssl.x509" and local openssl_store = require "openssl.x509.store". getSubject() is giving some certificate details : CN=blr2preman1, client: 10.120.10.151, server: kong, request: "GET /example HTTP/1.1", host: "10.120.9.149:8443" Commented Apr 29, 2019 at 13:46
  • Which type has subject after client_cert:getSubject()? I can't figure it out, only by reading the doc. If you get a table object, you can simply use subject.CN. In case of string (for instance after subject:text()), following lua pattern should work string.match(urvar, 'CN=(.*),'). Commented Apr 29, 2019 at 15:06
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