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IRONMAN's avatar
IRONMAN
Icon for Cirrostratus rankCirrostratus
Sep 14, 2019

Client SSL Authentication info need to send back server, in HTTP header?

Any one guide me here, I am having requirement to send the below headers to back-end servers with HTTP header, ! Client profile i am creating for Client Authentication with Request: method.! Ser...
application delivery
iRules
LTM
security
Enes_Afsin_Al's avatar
Enes_Afsin_Al
Icon for MVP rankMVP
Sep 16, 2019

Hi IRONMAN,

when CLIENTSSL_CLIENTCERT priority 100 {
    if {[SSL::cert count] > 0} {
        set clientCert [X509::whole [SSL::cert 0]]
        set clientCertSubject [X509::subject [SSL::cert 0]]
        set clientCertHash [X509::hash [SSL::cert 0]]
        foreach field [ split $clientCertSubject ","] {
            if {$field starts_with "CN="} {
                set clientCommonName [getfield $field "=" 2]
            }
        }
    }
}
 
when HTTP_REQUEST {
    if {([info exists clientCert]) && ($clientCert ne "")} {
        HTTP::header insert X-SSL-Client-Cert $clientCert
    }
 
    if {([info exists clientCommonName]) && ($clientCommonName ne "")} {
        HTTP::header insert X-SSL-Client-CN $clientCommonName
    }
 
    if {([info exists clientCertHash]) && ($clientCertHash ne "")} {
        HTTP::header insert X-SSL-Client-SHA1 $clientCertHash
    }
}
  • IRONMAN's avatar
    IRONMAN
    Icon for Cirrostratus rankCirrostratus
    Sep 16, 2019

    Please let me know, should i add below for set the $clientCertHash value from SSL?

     

     

    if {$field starts_with "CN="} {

            set clientCommonName [getfield $field "=" 2]

          }

    • Enes_Afsin_Al's avatar
      Enes_Afsin_Al
      Icon for MVP rankMVP
      Sep 16, 2019

      You should use it for clientCommonName (X-SSL-Client-CN)

      # for X-SSL-Client-CN

      set clientCertSubject [X509::subject [SSL::cert 0]]
foreach field [ split $clientCertSubject ","] {
    if {$field starts_with "CN="} {
        set clientCommonName [getfield $field "=" 2]
    }
}

      # for X-SSL-Client-SHA1

      set clientCertHash [X509::hash [SSL::cert 0]]
    • IRONMAN's avatar
      IRONMAN
      Icon for Cirrostratus rankCirrostratus
      Sep 16, 2019

      Thanks Eaa,

       

      So i get thumbprint value inserted as a header with below action.

       

      1. set clientCertHash [X509::hash [SSL::cert 0]]