REMOTE_USER is not available at the time of external function call in httpd RewriteMap (Apache Users)

REMOTE_USER is not available at the time of external function call in httpd RewriteMap

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To: users@xxxxxxxxxxxxxxxx

Subject: REMOTE_USER is not available at the time of external function call in httpd RewriteMap

From: Chudamani Padhan <pchudamani006@xxxxxxxxx>

Date: Thu, 20 Sep 2018 17:11:26 +0530

Reply-to: users@xxxxxxxxxxxxxxxx

Hi,

I am trying to set HTTP basic auth header for an user which is already authenticated by external application. For doing that, we have to set base64 encoded of "username:dummy" where password is any dummy value. In ssl config, REMOTE_USER is getting captured properly in RequestHeader(Line 5) but not in RewriteRule (Line 3). In line 3, I tried with REMOTE_USER, LA-U:REMOTE_USER, HTTP:REMOTE_USER. But all these variables are null. Am I missing any config here?

ssl.conf

Line 1- RewriteEngine on

Line 2- RewriteMap base64map "prg:/opt/scripts/base64.pl"

Line 3- RewriteRule .* - [E=AUTHN:${base64map:%{LA-U:REMOTE_USER}:%{LA-U:REMOTE_USER}},NE]

Line 4- RequestHeader set Authorization "Basic %{AUTHN}e"

Line 5- RequestHeader set X-Remote-User2 %{REMOTE_USER}s

Thanks,

Chudamani