internal TSIP_Header CreateHeaderAuthorization(TSIP_Request request)
{
if (request == null)
{
TSK_Debug.Error("Invalid parameter");
return(null);
}
String response, nc = null, uristring;
if (String.IsNullOrEmpty(uristring = TSIP_Uri.ToString(request.Uri, true, false)))
{
TSK_Debug.Error("Failed to parse URI: {0}", request.Uri);
return(null);
}
/* We compute the nc here because @ref tsip_challenge_get_response function will increment it's value. */
if (mNc > 0)
{
nc = THTTP_Auth.GetNonceString(mNc).ToString();
}
/* entity_body ==> request-content */
response = GetResponse(request.Method, uristring, request.Content);
if (mProxy)
{
// FIXME
TSK_Debug.Error("Proxy-Authorization header not supported yet");
}
else
{
TSIP_HeaderAuthorization header = new TSIP_HeaderAuthorization();
header.UserName = ChallengeUserName;
header.Scheme = mScheme;
header.Realm = mRealm;
header.Nonce = mNonce;
header.Qop = mQop;
header.Algorithm = String.IsNullOrEmpty(mAlgorithm) ? "MD5" : mAlgorithm;
header.Cnonce = mNc > 0 ? mCnonce : null;
header.Uri = uristring;
header.Nc = mNc > 0 ? nc : null;
header.Response = response;
return(header);
}
return(null);
}
internal String GetResponse(String method, String uristring, byte[] entity_body)
{
String response = String.Empty;
if (IsDigest)
{
String ha1 = null, ha2;
String nc = String.Empty;
/* ===
* Calculate HA1 = MD5(A1) = M5(username:realm:secret)
* In case of AKAv1-MD5 and AKAv2-MD5 the secret must be computed as per RFC 3310 + 3GPP TS 206/7/8/9.
* The resulting AKA RES parameter is treated as a "password"/"secret" when calculating the response directive of RFC 2617.
*/
if (IsAKAv1 || IsAKAv2)
{
TSK_Debug.Error("AKAv1 and AKAv2 are not supported yet");
return(null);
}
else
{
ha1 = THTTP_Auth.GetDigestHA1(ChallengeUserName, mRealm, ChallengePassword);
}
/* ===
* HA2
*/
ha2 = THTTP_Auth.GetDigestHA2(method, uristring, entity_body, mQop);
/* RESPONSE */
if (mNc > 0)
{
nc = THTTP_Auth.GetNonceString(mNc).ToString();
}
response = THTTP_Auth.GetDigestResponse(ha1, mNonce, mNc, mCnonce, mQop, ha2);
if (!String.IsNullOrEmpty(mQop))
{
++mNc;
}
}
return(response);
}