APM SAML IdP - SP Issuer Extraction
Problem this snippet solves: APM doesn't expose any detail about the SAML SP Issuer when authentication requests hitting APM as an IdP during an SP initiated SAMLRequest. This iRule when applied to a SAML IdP enabled virtual server will extract the assertion request, decode it and present the SAML SP Issuer ID as the session variable %{session.saml.request.issuer} within APM. How to use this snippet: This comes in real handy when performing authorisation of the resource and could help avoid having APM perform a TCP connection reset when a SAML resource isn't authorised. Code : when CLIENT_ACCEPTED { ACCESS::restrict_irule_events disable } when HTTP_REQUEST { if { [HTTP::path] equals "/saml/idp/profile/redirectorpost/sso" } { if { [HTTP::method] equals "POST" } { # Colelct POST data set content_length [HTTP::header value Content-Length] HTTP::collect $content_length } elseif { [HTTP::method] equals "GET" } { #TODO } } } when HTTP_REQUEST_DATA { set payload_data [URI::decode [HTTP::payload]] log local0. "payload=[URI::query "?$payload_data" "SAMLRequest"]" if { $payload_data contains "SAMLRequest" } { # Extract SAML request data set SAMLdata [b64decode [URI::query "?$payload_data" "SAMLRequest"]] set SAML_Issuer_loc [string first "saml:issuer" [string tolower $SAMLdata]] set SAML_Issuer_start [expr {[string first ">" $SAMLdata $SAML_Issuer_loc] + 1}] set SAML_Issuer_end [expr {[string first "<" $SAMLdata $SAML_Issuer_start] - 1}] set SAML_Issuer [string range $SAMLdata $SAML_Issuer_start $SAML_Issuer_end] if { !([ACCESS::session sid] equals "" ) } { ACCESS::session data set session.saml.request.issuer $SAML_Issuer } } } when ACCESS_SESSION_STARTED { if { [info exists SAML_Issuer] } { ACCESS::session data set session.saml.request.issuer $SAML_Issuer } } Tested this on version: 11.6