[Seagull-users] SIP REGISTER with MD5 - How to set response parameter?

[Michael H. <Mic...@we...>]

Hello,

I started with Seagull recently and I currently prepare some default SIP scenarios.
No problems occured with basic call handling scenarios, but now I have a problem , when
performing a REGISTER scenario with MD5 authentication.

I have enhanced the dictionary by the following:
- an external method "authentication", acc. to the documentation

  <external-method>
    <defmethod name="authentication"
        param="lib=lib_crypto.so;function=crypto_method">
    </defmethod>
  </external-method>

- a header field WWW-Authenticate (returned from server in 401 Unaithorized) with its
  parameters realm and nonce
 
  <fielddef name="www-authenticate">
     <regexp name="www-auth"
             expr="[Ww][Ww][Ww]-[Aa][Uu][Tt][Hh][Ee][Nn][Tt][Ii][Cc][Aa][Tt][Ee][     ]*:[     ]*(.*)$"
             nbexpr="2"
             subexpr="1">
     </regexp>
   </fielddef>

   <fielddef name="www-auth-realm">
     <regexp name="www-auth-realm"
             expr="[Ww][Ww][Ww]-[Aa][Uu][Tt][Hh][Ee][Nn][Tt][Ii][Cc][Aa][Tt][Ee][     ]*:[     ]*Digest realm=\"([A-Za-z0-9.:_\-]*)\", nonce=\"([A-Za-z0-9]*)\", algorithm=MD5"
             nbexpr="3"
             subexpr="1">
     </regexp>
   </fielddef>

   <fielddef name="www-auth-nonce">
     <regexp name="www-auth-nonce"
             expr="[Ww][Ww][Ww]-[Aa][Uu][Tt][Hh][Ee][Nn][Tt][Ii][Cc][Aa][Tt][Ee][     ]*:[     ]*Digest realm=\"([A-Za-z0-9.:_\-]*)\", nonce=\"([A-Za-z0-9]*)\", algorithm=MD5"
             nbexpr="3"
             subexpr="2">
     </regexp>
   </fielddef>

- a header field Authorization (to be sent to the server in the second REGISTER as response to 401)

   <fielddef name="authorization">
      <regexp name="authorization"
                expr="[Aa][Uu][Tt][Hh][Oo][Rr][Ii][Zz][Aa][Tt][Ii][Oo][Nn][     ]*:[     ]*(.*)$"
                nbexpr="2"
                subexpr="1">
      </regexp>
   </fielddef>

- may be, I need to add a field authorization-response as well, e.g.

  <fielddef name="auth-resp">
      <regexp name="auth-resp"
            expr="[Aa][Uu][Tt][Hh][Oo][Rr][Ii][Zz][Aa][Tt][Ii][Oo][Nn][     ]*:[     ]*Digest username=\"([!-}]*@[A-Za-z0-9.:_-]*)\",realm=\"([A-Za-z0-9.:_-]*)\",nonce=\"([A-Za-z0-9]*)\",uri=\"sip:([A-Za-z0-9.:_-]*)\",response=\"([A-Za-z0-9]*)\",algorithm=MD5"
            nbexpr="6"
          subexpr="5">
      </regexp>
  </fielddef>

I want to generate the Authorization header with several parameters (userid,
realm, nonce, response, algorithm) using the set-value method.

The only tricky (and this is where I got stuck) is the response parameter:

I need to take nonce from WWW-Autenticate header (has been stored as
WWW_AUTH_NONCE) and the user's password (from an external file) and
apply the MD5 algorithm with help from the authentcation method.
I do not have an idea, how to do that.

Can someone please provide me some hints, how to overcome this issue?

Thanks in advance and kind regards,

Michael
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