PowerBuilder

HTTPS Server Certificate Require Hostname Match

See more HTTP Examples

Demonstrates and explains the RequireHostnameMatch property. PowerBuilder

integer li_rc
oleobject loo_Http
string ls_Html

// 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

loo_Http = create oleobject
li_rc = loo_Http.ConnectToNewObject("Chilkat.Http")
if li_rc < 0 then
    destroy loo_Http
    MessageBox("Error","Connecting to COM object failed")
    return
end if

loo_Http.RequireHostnameMatch = 1

// This should succeed because "www.chilkatsoft.com" matches the SAN entry "*.chilkatsoft.com"
ls_Html = loo_Http.QuickGetStr("https://www.chilkatsoft.com/helloWorld.html")
Write-Debug "1) Succeeded: " + string(loo_Http.LastMethodSuccess)

// 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.
ls_Html = loo_Http.QuickGetStr("https://3.101.18.47/helloWorld.html")
Write-Debug "2) Succeeded: " + string(loo_Http.LastMethodSuccess)

// However, it will succeed if we explicitly set the SNI hostname.
loo_Http.SniHostname = "www.chilkatsoft.com"
ls_Html = loo_Http.QuickGetStr("https://3.101.18.47/helloWorld.html")
Write-Debug "3) Succeeded: " + string(loo_Http.LastMethodSuccess)

// Remove our explicit SNI hostname.
loo_Http.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.  
ls_Html = loo_Http.QuickGetStr("https://wrong.host.badssl.com/")
Write-Debug "4) Succeeded: " + string(loo_Http.LastMethodSuccess)

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


destroy loo_Http