private Boolean UpdateChallenges(TSIP_Response response, Boolean acceptNewVector)
{
Boolean ret = true;
TSIP_HeaderWWWAuthenticate WWW_Authenticate;
// TSIP_HeaderProxyAuthenticate Proxy_Authenticate;
/* RFC 2617 - HTTP Digest Session
*
* (A) The client response to a WWW-Authenticate challenge for a protection
* space starts an authentication session with that protection space.
* The authentication session lasts until the client receives another
* WWW-Authenticate challenge from any server in the protection space.
*
* (B) The server may return a 401 response with a new nonce value, causing the client
* to retry the request; by specifying stale=TRUE with this response,
* the server tells the client to retry with the new nonce, but without
* prompting for a new username and password.
*/
/* RFC 2617 - 1.2 Access Authentication Framework
* The realm directive (case-insensitive) is required for all authentication schemes that issue a challenge.
*/
/* FIXME: As we perform the same task ==> Use only one loop.
*/
for (int i = 0; (WWW_Authenticate = (TSIP_HeaderWWWAuthenticate)response.GetHeaderAtIndex(TSIP_Header.tsip_header_type_t.WWW_Authenticate, i)) != null; i++)
{
Boolean isnew = true;
foreach (TSIP_Challenge challenge in mChallenges)
{
//if(challenge.IProxy)
//{
// continue;
//}
if (String.Equals(challenge.Realm, WWW_Authenticate.Realm, StringComparison.InvariantCultureIgnoreCase) && (WWW_Authenticate.Stale || acceptNewVector))
{
/*== (B) ==*/
if (!(ret = challenge.Update(WWW_Authenticate.Scheme,
WWW_Authenticate.Realm,
WWW_Authenticate.Nonce,
WWW_Authenticate.Opaque,
WWW_Authenticate.Algorithm,
WWW_Authenticate.Qop)))
{
return(ret);
}
else
{
isnew = false;
continue;
}
}
else
{
TSK_Debug.Error("Failed to handle new challenge");
return(false);
}
}
if (isnew)
{
TSIP_Challenge challenge;
if ((challenge = new TSIP_Challenge(this.Stack,
false,
WWW_Authenticate.Scheme,
WWW_Authenticate.Realm,
WWW_Authenticate.Nonce,
WWW_Authenticate.Opaque,
WWW_Authenticate.Algorithm,
WWW_Authenticate.Qop)) != null)
{
mChallenges.Add(challenge);
}
else
{
TSK_Debug.Error("Failed to handle new challenge");
return(false);
}
}
}
return(ret);
}
protected Int64 GetNewDelay(TSIP_Response response)
{
Int64 expires = mExpires;
Int64 newdelay = expires; /* default value */
TSIP_Header hdr;
int i;
/*== NOTIFY with subscription-state header with expires parameter */
if (response.CSeq.RequestType == TSIP_Message.tsip_request_type_t.NOTIFY)
{
TSIP_HeaderSubscriptionState hdr_state = response.GetHeader(TSIP_Header.tsip_header_type_t.Subscription_State) as TSIP_HeaderSubscriptionState;
if (hdr_state != null && hdr_state.Expires > 0)
{
expires = TSK_Time.Seconds2Milliseconds(hdr_state.Expires);
goto compute;
}
}
/*== Expires header */
if ((hdr = response.GetHeader(TSIP_Header.tsip_header_type_t.Expires)) != null)
{
expires = TSK_Time.Seconds2Milliseconds((hdr as TSIP_HeaderExpires).DeltaSeconds);
goto compute;
}
/*== Contact header */
for (i = 0; (hdr = response.GetHeaderAtIndex(TSIP_Header.tsip_header_type_t.Contact, i)) != null; i++)
{
TSIP_HeaderContact contact = hdr as TSIP_HeaderContact;
if (contact != null && contact.Uri != null)
{
String transport = TSK_Param.GetValueByName(contact.Uri.Params, "transport");
TSIP_Uri contactUri = this.Stack.GetContactUri(String.IsNullOrEmpty(transport) ? "udp" : transport);
if (contactUri != null)
{
if (String.Equals(contact.Uri.UserName, contactUri.UserName) &&
String.Equals(contact.Uri.Host, contactUri.Host) &&
contact.Uri.Port == contactUri.Port)
{
if (contact.Expires >= 0) /* No expires parameter ==> -1*/
{
expires = TSK_Time.Seconds2Milliseconds(contact.Expires);
goto compute;
}
}
}
}
}
/*
* 3GPP TS 24.229 -
*
* The UE shall reregister the public user identity either 600 seconds before the expiration time if the initial
* registration was for greater than 1200 seconds, or when half of the time has expired if the initial registration
* was for 1200 seconds or less.
*/
compute:
expires = TSK_Time.Milliseconds2Seconds(expires);
newdelay = (expires > 1200) ? (expires - 600) : (expires / 2);
return(TSK_Time.Seconds2Milliseconds(newdelay));
}
/// <summary>
/// Updates the dialog state:
/// - Authorizations (using challenges from the @a response message)
/// - State (early, established, disconnected, ...)
/// - Routes (and Service-Route)
/// - Target (remote)
/// - ...
/// </summary>
/// <param name="response"></param>
/// <returns></returns>
protected Boolean UpdateWithResponse(TSIP_Response response)
{
if (response == null || response.To == null || response.CSeq == null)
{
return(false);
}
String tag = response.To.Tag;
/*
* 1xx (!100) or 2xx
*/
/*
* 401 or 407 or 421 or 494
*/
if (response.StatusCode == 401 || response.StatusCode == 407 || response.StatusCode == 421 || response.StatusCode == 494)
{
Boolean acceptNewVector;
/* 3GPP IMS - Each authentication vector is used only once.
* ==> Re-registration/De-registration ==> Allow 401/407 challenge.
*/
acceptNewVector = (response.CSeq.RequestType == TSIP_Message.tsip_request_type_t.REGISTER && this.State == tsip_dialog_state_t.Established);
return(this.UpdateChallenges(response, acceptNewVector));
}
else if (100 < response.StatusCode && response.StatusCode < 300)
{
tsip_dialog_state_t state = this.State;
/* 1xx */
if (response.StatusCode <= 199)
{
if (String.IsNullOrEmpty(response.To.Tag))
{
TSK_Debug.Error("Invalid tag parameter");
return(false);
}
state = tsip_dialog_state_t.Early;
}
/* 2xx */
else
{
state = tsip_dialog_state_t.Established;
}
/* Remote target */
{
/* RFC 3261 12.2.1.2 Processing the Responses
* When a UAC receives a 2xx response to a target refresh request, it
* MUST replace the dialog's remote target URI with the URI from the
* Contact header field in that response, if present.
*
* FIXME: Because PRACK/UPDATE sent before the session is established MUST have
* the rigth target URI to be delivered to the UAS ==> Do not not check that we are connected
*/
if (response.CSeq.RequestType != TSIP_Message.tsip_request_type_t.REGISTER && response.Contact != null && response.Contact.Uri != null)
{
mUriRemoteTarget = response.Contact.Uri.Clone(true, false);
}
}
/* Route sets */
{
int index;
TSIP_HeaderRecordRoute recordRoute;
mRecordRoutes.Clear();
for (index = 0; (recordRoute = response.GetHeaderAtIndex(TSIP_Header.tsip_header_type_t.Record_Route, index) as TSIP_HeaderRecordRoute) != null; index++)
{
mRecordRoutes.Insert(0, recordRoute); /* Copy reversed. */
}
}
/* cseq + tags + ... */
if (this.State == tsip_dialog_state_t.Established && String.Equals(mTagRemote, tag, StringComparison.InvariantCultureIgnoreCase))
{
return(true);
}
else
{
if (response.CSeq.RequestType != TSIP_Message.tsip_request_type_t.REGISTER && response.CSeq.RequestType != TSIP_Message.tsip_request_type_t.PUBLISH)
{ /* REGISTER and PUBLISH don't establish dialog */
mTagRemote = tag;
}
#if NEVER_EXECUTE_00 // PRACK and BYE will have same CSeq value ==> Let CSeq value to be incremented by "tsip_dialog_request_new()"
self->cseq_value = response->CSeq ? response->CSeq->seq : self->cseq_value;
#endif
}
this.State = state;
return(true);
}
return(true);
}
