windows - How does NetTcpBinding(read WindowsStreamSecurityBindingElement) encrypt/sign messages? -

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i wanted understand mechanism of message encryption , signing used nettcpbinding when 'windows' credentials being used transport security. if ad uses ntlm instead of kerberos? messages still signed , encrypted?if so, how?

thanks in advance,

akshat

the short answer that, yes, ntlm authentication messages still signed , encrypted if have set transport security protectionlevel encryptandsign (the default).

here's outline of how works:

  • selecting transport security configures windowsstreamsecuritybindingelement in channel stack. inserts stream upgrade provider (see below)
  • in nettcpbinding, message exchange between client , service happens within .net message framing protocol, provides both message framing , mechanism client , service negotiate stream upgrades, principal use of establish transport security. if there stream upgrade provider configured in channel stack, invoked during preamble stage of framing protocol when client opens channel.
  • the upgrade provider windowsstreamsecuritybindingelement invokes sspi handshake between client , server using spnego security package: in nettcpbinding result in kerberos being selected underlying security provider if available, choose ntlm if not.
  • if ntlm resulting authentication provider, sspi handshake involve three-leg ntlm challenge-response exchange of tokens described in the ntlm specification. protocol includes mechanism exchanging keys message signing , encryption. once sspi handshake has generated appropriate security context, thereafter messages exchanged signed , encrypted in sending channel stack's stream upgrade provider, , decrypted , verified in receiving channel stack's stream upgrade provider, in each case using calls ntlm security provider via abstracted sspi message support functions.

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