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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

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]]