TLS client certificate forward plugin for traefik

Built-in traefik middleware PassTLSClientCert let you pass many certificate parameters such as common name or serial number. But all parameter passed in one header value, so you can not get just pure certificate serial number in header. This middleware solves this problem for you. It extracts just pure SN value and put in a header

Configuration

Fields meaning

• snHeaderName: name of header, in which will be put decimal SN value. Default is Forwarded-Tls-Client-Cert-Dec-Sn
• logLevel: warn, info or debug. Default is info

Static config examples

• cli as local plugin

--experimental.localplugins.tlsclientcertforward=true
--experimental.localplugins.tlsclientcertforward.modulename=github.com/v-electrolux/tlsclientcertforward

• envs as local plugin

TRAEFIK_EXPERIMENTAL_LOCALPLUGINS_tlsclientcertforward=true
TRAEFIK_EXPERIMENTAL_LOCALPLUGINS_tlsclientcertforward_MODULENAME=github.com/v-electrolux/tlsclientcertforward

• yaml as local plugin

experimental:
  localplugins:
     tlsclientcertforward:
      modulename: github.com/v-electrolux/tlsclientcertforward

• toml as local plugin

[experimental.localplugins.tlsclientcertforward]
    modulename = "github.com/v-electrolux/tlsclientcertforward"

Dynamic config examples

• docker labels

traefik.http.middlewares.snForwardMiddleware.plugin.tlsclientcertforward.snHeaderName=SSL_SN_HEADER
traefik.http.middlewares.snForwardMiddleware.plugin.tlsclientcertforward.logLevel=warn
traefik.http.routers.snForwardRouter.middlewares=snForwardMiddleware

• yaml

http:

  routers:
    snForwardRouter:
      rule: host(`demo.localhost`)
      service: backend
      entryPoints:
        - web
      middlewares:
        - snForwardMiddleware

  services:
    backend:
      loadBalancer:
        servers:
          - url: 127.0.0.1:5000

  middlewares:
     snForwardMiddleware:
      plugin:
        tlsclientcertforward:
          snHeaderName: SSL_SN_HEADER
          logLevel: warn