Hi,
Am developing a diameter server using go-diameter package that need to
perform EAP-AKA authentication.
In the DER/DEA process, the client will be sending multiple request to the
server,
that is first the client sends an identity request to the server, the
server respond with
RAND, MAC, etc to the client, the client then sends second request to the
server, in this case with
different parameters(RES, MAC, etc) to the server.
The server need to handle the second request using the same handle if am
right since in DER/DEA,
the server handle only DER. My question is how can i handle the second
request coming from the client
using the same handle(DER) at the diameter server side. That using the same
DER handle to response to
diameter client multiple request. Depending on the received message the
server unmarshal the set of AVPs to the right structure.
Is it possible, if possible any help. Currently i have at the server side
this request handle
//First server response to cleint should containg this payload
func AKA_Challenge_Request(settings sm.Settings, w io.Writer, m
*diam.Message) (n int64, err error) {
PayloadSlice := []byte(`RAND, AUTHN, MAC, RESULT_ID`)
m.NewAVP(avp.EAPPayload, avp.Mbit, 0,
datatype.OctetString(PayloadSlice))
return m.WriteTo(w)
}
//Second server response to cleint should containg this payload
func AKA_Success_Notification(settings sm.Settings, w io.Writer, m
*diam.Message) (n int64, err error) {
EAPSlice := []byte(`EAP_Success`)
MSKSlice := []byte(`EAP-Master-Session-Key`)
m.NewAVP(avp.EAPPayload, avp.Mbit, 0, datatype.OctetString(EAPSlice))
m.NewAVP(avp.EAPMasterSessionKey, avp.Mbit, 0,
datatype.OctetString(MSKSlice))
return m.WriteTo(w)
}
// Handle funtion at the server side
func HandleDER(settings sm.Settings) diam.HandlerFunc {
// If received AVP messages are of this struct format, Unmarshal message to
this structure
type HandleDERRequest struct {
SessionID datatype.UTF8String `avp:"Session-Id"`
OriginHost datatype.DiameterIdentity `avp:"Origin-Host"`
OriginRealm datatype.DiameterIdentity `avp:"Origin-Realm"`
DestinationHost datatype.DiameterIdentity `avp:"Destination-Host"`
DestinationRealm datatype.DiameterIdentity
`avp:"Destination-Realm"`
UserName datatype.UTF8String `avp:"User-Name"`
AuthSessionState datatype.Enumerated
`avp:"Auth-Session-State"`
AuthApplicationID datatype.Unsigned32
`avp:"Auth-Application-Id"`
AuthRequestType datatype.Enumerated
`avp:"Auth-Request-Type"`
EAPPayload datatype.OctetString `avp:"EAP-Payload"`
RATType datatype.Enumerated `avp:"RAT-Type"`
ANID datatype.UTF8String `avp:"ANID"`
}
// If received AVP messages are of this struct format, Unmarshal message to
this structure
type HandleDERRequest struct {
SessionID datatype.UTF8String `avp:"Session-Id"`
OriginHost datatype.DiameterIdentity `avp:"Origin-Host"`
OriginRealm datatype.DiameterIdentity `avp:"Origin-Realm"`
DestinationHost datatype.DiameterIdentity `avp:"Destination-Host"`
DestinationRealm datatype.DiameterIdentity
`avp:"Destination-Realm"`
EAPPayload datatype.OctetString `avp:"EAP-Payload"`
}
return func(c diam.Conn, m *diam.Message) {
var err error = nil
var req HandleDERRequest
var code uint32 = diam.Success
err = m.Unmarshal(&req)
if err != nil {
err = fmt.Errorf("Unmarshal failed: %s", err)
code = diam.UnableToComply
log.Printf("Invalid DER(%d): %s\n", code, err.Error())
} else {
code = diam.Success
}
fmt.Println(string(req.EAPPayload))
a := m.Answer(code)
a.NewAVP(avp.SessionID, avp.Mbit, 0, req.SessionID)
a.NewAVP(avp.OriginHost, avp.Mbit, 0, req.DestinationHost)
a.NewAVP(avp.OriginRealm, avp.Mbit, 0, req.DestinationRealm)
a.NewAVP(avp.OriginStateID, avp.Mbit, 0, settings.OriginStateID)
//Respond with first payload
_, err = AKA_Challenge_Request(settings, c, a)
if err != nil {
log.Printf("Failed to send AAA challenge request: %s",
err.Error())
}
}
}
Any help?
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