AutoIt

HTTPS Server Certificate Require Hostname Match

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Demonstrates and explains the RequireHostnameMatch property. AutoIt

; The RequireHostnameMatch property was added in Chilkat v11.0.0
; to ensure the URL's hostname matches at least one of the server certificate SAN's (Subject Alternative Names)
; 
; In actuality, it is the SNI hostname that must match.  If the SNI hostname is not explicitly set,
; then Chilkat uses the hostname from the URL as the SNI hostname.

; Here's an example using chilkatsoft.com
; The SSL server certificate for chilkatsoft.com has 2 Subject Alternative Names:
; 
; 1) DNS Name: *.chilkatsoft.com
; 2) DNS Name: chilkatsoft.com
; 
; See Explaining the SNI Hostname in TLS

$oHttp = ObjCreate("Chilkat.Http")

$oHttp.RequireHostnameMatch = True

; This should succeed because "www.chilkatsoft.com" matches the SAN entry "*.chilkatsoft.com"
Local $sHtml = $oHttp.QuickGetStr("https://www.chilkatsoft.com/helloWorld.html")
ConsoleWrite("1) Succeeded: " & $oHttp.LastMethodSuccess & @CRLF)

; At the time of writing this example, the IP address for chilkatsoft.com is 3.101.18.47
; If we send the request using the IP address, it will fail because the IP address is does 
; not match any of the SAN entries in the server certificate.
$sHtml = $oHttp.QuickGetStr("https://3.101.18.47/helloWorld.html")
ConsoleWrite("2) Succeeded: " & $oHttp.LastMethodSuccess & @CRLF)

; However, it will succeed if we explicitly set the SNI hostname.
$oHttp.SniHostname = "www.chilkatsoft.com"
$sHtml = $oHttp.QuickGetStr("https://3.101.18.47/helloWorld.html")
ConsoleWrite("3) Succeeded: " & $oHttp.LastMethodSuccess & @CRLF)

; Remove our explicit SNI hostname.
$oHttp.SniHostname = ""

; Now let's try wrong.host.badssl.com
; The SSL server certificate for badssl.com has 2 Subject Alternative Names:
; 
; 1) DNS Name: *.badssl.com
; 2) DNS Name: badssl.com

; The domain wrong.host.badssl.com will fail the RequireHostnameMatch because
; the wildcarded domain SAN entry only extends 1 level deep.  
$sHtml = $oHttp.QuickGetStr("https://wrong.host.badssl.com/")
ConsoleWrite("4) Succeeded: " & $oHttp.LastMethodSuccess & @CRLF)

; The expected output is:
; 1) Succeeded: True
; 2) Succeeded: False
; 3) Succeeded: True
; 4) Succeeded: False