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regexhaproxy

HAProxy config with log-format. Need replace string in the log

I have a working config of HAProxy that captured the Authorization header in log file.
Captured authorization string looks like Basic dGVzdDp0ZXN0Cg==.

I need to remove Basic and convert dGVzdDp0ZXN0Cg== from base64 to original text.
I could convert whole captured string into base64 like %[capture.req.hdr(0),base64] but how convert it back to original?

Part of config file:

tcp-request content capture req.hdr(Authorization) len 128
log-format "%Tl "Client"-"%ci" "ConnectsTo"-"%fi:%fp" AuthorizationHeader:%[capture.req.hdr(0),regsub(Basic\s*,)] %hs"
Solution

  • To remove "Basic " from line beginning and decode AuthorizationHeader from base64 to original just need add %[capture.req.hdr(0),regsub(Basic\s*,),b64dec]
    Full config:

    tcp-request content capture req.hdr(Authorization) len 128
log-format "Client-%ci Server-%fi:%fp AuthorizationHeader:%[capture.req.hdr(0),regsub(Basic\s*,),b64dec]"