/// <summary>
/// Performs an identity verification process for the client's identity using the already opened connection to the server.
/// </summary>
/// <returns>true if the function succeeds, false otherwise.</returns>
public async Task <bool> VerifyIdentityAsync()
{
log.Trace("()");
bool res = false;
if (await StartConversationAsync())
{
ProxProtocolMessage requestMessage = MessageBuilder.CreateVerifyIdentityRequest(serverChallenge);
if (await SendMessageAsync(requestMessage))
{
ProxProtocolMessage responseMessage = await ReceiveMessageAsync();
if (CheckResponseMessage(requestMessage, responseMessage))
{
res = true;
}
else
{
log.Warn("Received unexpected or invalid message.");
}
}
else
{
log.Warn("Unable to send message.");
}
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Sends StartNeighborhoodInitializationRequest to the server and reads a response.
/// </summary>
/// <param name="PrimaryPort">Primary interface port of the requesting proximity server.</param>
/// <param name="NeighborPort">Neighbors interface port of the requesting proximity server.</param>
/// <returns>true if the function succeeds, false otherwise.</returns>
public async Task <bool> StartNeighborhoodInitializationAsync(uint PrimaryPort, uint NeighborPort)
{
log.Trace("()");
bool res = false;
Config config = (Config)Base.ComponentDictionary[ConfigBase.ComponentName];
ProxProtocolMessage requestMessage = MessageBuilder.CreateStartNeighborhoodInitializationRequest(PrimaryPort, NeighborPort, config.ExternalServerAddress);
if (await SendMessageAsync(requestMessage))
{
ProxProtocolMessage responseMessage = await ReceiveMessageAsync();
if (CheckResponseMessage(requestMessage, responseMessage))
{
res = true;
}
else
{
if (lastResponseStatus != Status.ErrorBusy)
{
log.Warn("Received unexpected or invalid message.");
}
}
}
else
{
log.Warn("Unable to send message.");
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Sends ListRolesRequest to the server and reads a response.
/// </summary>
/// <returns>ListRolesResponse message if the function succeeds, null otherwise.</returns>
public async Task <ListRolesResponse> SendListRolesRequest()
{
log.Trace("()");
ListRolesResponse res = null;
ProxProtocolMessage requestMessage = MessageBuilder.CreateListRolesRequest();
if (await SendMessageAsync(requestMessage))
{
ProxProtocolMessage responseMessage = await ReceiveMessageAsync();
if (CheckResponseMessage(requestMessage, responseMessage))
{
res = responseMessage.Response.SingleResponse.ListRoles;
}
else
{
log.Warn("Received unexpected or invalid message.");
}
}
else
{
log.Warn("Unable to send message.");
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Sends StopNeighborhoodUpdatesRequest to the server and reads a response.
/// </summary>
/// <param name="RequestMessage">Request message to send.</param>
/// <returns>true if the function succeeds, false otherwise.</returns>
public async Task <bool> SendStopNeighborhoodUpdatesAsync(ProxProtocolMessage RequestMessage)
{
log.Trace("()");
bool res = false;
ProxProtocolMessage requestMessage = RequestMessage;
if (await SendMessageAsync(requestMessage))
{
ProxProtocolMessage responseMessage = await ReceiveMessageAsync();
if (CheckResponseMessage(requestMessage, responseMessage))
{
res = true;
}
else
{
if (lastResponseStatus != Status.ErrorNotFound)
{
log.Warn("Received unexpected or invalid message.");
}
}
}
else
{
log.Warn("Unable to send message.");
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Reads and parses protocol message from the network stream.
/// </summary>
/// <returns>Parsed protocol message or null if the function fails.</returns>
public async Task <ProxProtocolMessage> ReceiveMessageAsync()
{
log.Trace("()");
ProxProtocolMessage res = null;
using (CancellationTokenSource readTimeoutTokenSource = new CancellationTokenSource(60000),
timeoutShutdownTokenSource = CancellationTokenSource.CreateLinkedTokenSource(readTimeoutTokenSource.Token, shutdownCancellationToken))
{
RawMessageReader messageReader = new RawMessageReader(Stream);
RawMessageResult rawMessage = await messageReader.ReceiveMessageAsync(timeoutShutdownTokenSource.Token);
if (rawMessage.Data != null)
{
res = (ProxProtocolMessage)CreateMessageFromRawData(rawMessage.Data);
if (res.MessageTypeCase == Message.MessageTypeOneofCase.Response)
{
lastResponseStatus = res.Response.Status;
lastResponseDetails = res.Response.Details;
}
}
}
ForceDisconnect = res == null;
log.Trace("(-):ForceDisconnect={0}", ForceDisconnect, res != null ? "Message" : "null");
return(res);
}
/// <summary>
/// Generates client's challenge and creates start conversation request with it.
/// </summary>
/// <returns>StartConversationRequest message that is ready to be sent to the server.</returns>
public ProxProtocolMessage CreateStartConversationRequest()
{
clientChallenge = new byte[ProxMessageBuilder.ChallengeDataSize];
Crypto.Rng.GetBytes(clientChallenge);
ProxProtocolMessage res = MessageBuilder.CreateStartConversationRequest(clientChallenge);
return(res);
}
/// <summary>
/// Verifies whether the server successfully signed the correct start conversation challenge.
/// </summary>
/// <param name="StartConversationResponse">StartConversationResponse received from the server.</param>
/// <returns>true if the signature is valid, false otherwise.</returns>
public bool VerifyServerChallengeSignature(ProxProtocolMessage StartConversationResponse)
{
log.Trace("()");
byte[] receivedChallenge = StartConversationResponse.Response.ConversationResponse.Start.ClientChallenge.ToByteArray();
bool res = ByteArrayComparer.Equals(receivedChallenge, clientChallenge) &&
MessageBuilder.VerifySignedConversationResponseBodyPart(StartConversationResponse, receivedChallenge, serverKey);
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Processes PingRequest message from client.
/// <para>Simply copies the payload to a new ping response message.</para>
/// </summary>
/// <param name="Client">Client that sent the request.</param>
/// <param name="RequestMessage">Full request message.</param>
/// <returns>Response message to be sent to the client.</returns>
public ProxProtocolMessage ProcessMessagePingRequest(IncomingClient Client, ProxProtocolMessage RequestMessage)
{
log.Trace("()");
ProxMessageBuilder messageBuilder = Client.MessageBuilder;
PingRequest pingRequest = RequestMessage.Request.SingleRequest.Ping;
ProxProtocolMessage res = messageBuilder.CreatePingResponse(RequestMessage, pingRequest.Payload.ToByteArray(), ProtocolHelper.GetUnixTimestampMs());
log.Trace("(-):*.Response.Status={0}", res.Response.Status);
return(res);
}
/// <summary>
/// Sends ERROR_PROTOCOL_VIOLATION to client with message ID set to 0x0BADC0DE.
/// </summary>
/// <param name="Client">Client to send the error to.</param>
public async Task SendProtocolViolation(ClientBase Client)
{
ProxMessageBuilder mb = new ProxMessageBuilder(0, new List <SemVer>()
{
SemVer.V100
}, null);
ProxProtocolMessage response = mb.CreateErrorProtocolViolationResponse(new ProxProtocolMessage(new Message()
{
Id = 0x0BADC0DE
}));
await Client.SendMessageAsync(response);
}
/// <summary>
/// Starts conversation with the server the client is connected to and checks whether the server response contains expected values.
/// </summary>
/// <returns>true if the function succeeds, false otherwise.</returns>
public async Task <bool> StartConversationAsync()
{
log.Trace("()");
bool res = false;
ProxProtocolMessage requestMessage = CreateStartConversationRequest();
if (await SendMessageAsync(requestMessage))
{
ProxProtocolMessage responseMessage = await ReceiveMessageAsync();
if (CheckResponseMessage(requestMessage, responseMessage))
{
try
{
SemVer receivedVersion = new SemVer(responseMessage.Response.ConversationResponse.Start.Version);
bool versionOk = receivedVersion.Equals(new SemVer(MessageBuilder.Version));
bool pubKeyLenOk = responseMessage.Response.ConversationResponse.Start.PublicKey.Length == ProtocolHelper.NetworkIdentifierLength;
bool challengeOk = responseMessage.Response.ConversationResponse.Start.Challenge.Length == ProxMessageBuilder.ChallengeDataSize;
serverKey = responseMessage.Response.ConversationResponse.Start.PublicKey.ToByteArray();
serverId = Crypto.Sha256(serverKey);
serverChallenge = responseMessage.Response.ConversationResponse.Start.Challenge.ToByteArray();
bool challengeVerifyOk = VerifyServerChallengeSignature(responseMessage);
res = versionOk && pubKeyLenOk && challengeOk && challengeVerifyOk;
}
catch
{
log.Warn("Received unexpected or invalid message.");
}
}
else
{
log.Warn("Received unexpected or invalid message.");
}
}
else
{
log.Warn("Unable to send message.");
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Processes VerifyIdentityRequest message from client.
/// <para>It verifies the identity's public key against the signature of the challenge provided during the start of the conversation.
/// If everything is OK, the status of the conversation is upgraded to Verified.</para>
/// </summary>
/// <param name="Client">Client that sent the request.</param>
/// <param name="RequestMessage">Full request message.</param>
/// <returns>Response message to be sent to the client.</returns>
public ProxProtocolMessage ProcessMessageVerifyIdentityRequest(IncomingClient Client, ProxProtocolMessage RequestMessage)
{
log.Trace("()");
ProxProtocolMessage res = null;
if (!CheckSessionConditions(Client, RequestMessage, ServerRole.Client | ServerRole.Neighbor, ClientConversationStatus.ConversationStarted, out res))
{
log.Trace("(-):*.Response.Status={0}", res.Response.Status);
return(res);
}
ProxMessageBuilder messageBuilder = Client.MessageBuilder;
VerifyIdentityRequest verifyIdentityRequest = RequestMessage.Request.ConversationRequest.VerifyIdentity;
byte[] challenge = verifyIdentityRequest.Challenge.ToByteArray();
if (StructuralEqualityComparer <byte[]> .Default.Equals(challenge, Client.AuthenticationChallenge))
{
if (messageBuilder.VerifySignedConversationRequestBody(RequestMessage, verifyIdentityRequest, Client.PublicKey))
{
log.Debug("Identity '{0}' successfully verified its public key.", Client.IdentityId.ToHex());
Client.ConversationStatus = ClientConversationStatus.Verified;
res = messageBuilder.CreateVerifyIdentityResponse(RequestMessage);
}
else
{
log.Warn("Client's challenge signature is invalid.");
res = messageBuilder.CreateErrorInvalidSignatureResponse(RequestMessage);
}
}
else
{
log.Warn("Challenge provided in the request does not match the challenge created by the proximity server.");
res = messageBuilder.CreateErrorInvalidValueResponse(RequestMessage, "challenge");
}
log.Trace("(-):*.Response.Status={0}", res.Response.Status);
return(res);
}
/// <summary>
/// Processes ListRolesRequest message from client.
/// <para>Obtains a list of role servers and returns it in the response.</para>
/// </summary>
/// <param name="Client">Client that sent the request.</param>
/// <param name="RequestMessage">Full request message.</param>
/// <returns>Response message to be sent to the client.</returns>
public ProxProtocolMessage ProcessMessageListRolesRequest(IncomingClient Client, ProxProtocolMessage RequestMessage)
{
log.Trace("()");
ProxProtocolMessage res = null;
if (!CheckSessionConditions(Client, RequestMessage, ServerRole.Primary, null, out res))
{
log.Trace("(-):*.Response.Status={0}", res.Response.Status);
return(res);
}
ProxMessageBuilder messageBuilder = Client.MessageBuilder;
ListRolesRequest listRolesRequest = RequestMessage.Request.SingleRequest.ListRoles;
List <Iop.Proximityserver.ServerRole> roles = GetRolesFromServerComponent();
res = messageBuilder.CreateListRolesResponse(RequestMessage, roles);
log.Trace("(-):*.Response.Status={0}", res.Response.Status);
return(res);
}
/// <summary>
/// Checks whether the create activity request is valid.
/// <para>This function does not verify the uniqueness of the activity identifier.
/// It also does not verify whether a closer proximity server exists.</para>
/// </summary>
/// <param name="CreateActivityRequest">Create activity request part of the client's request message.</param>
/// <param name="Client">Client that sent the request.</param>
/// <param name="RequestMessage">Full request message from client.</param>
/// <param name="ErrorResponse">If the function fails, this is filled with error response message that is ready to be sent to the client.</param>
/// <returns>true if the create activity request can be applied, false otherwise.</returns>
public static bool ValidateCreateActivityRequest(CreateActivityRequest CreateActivityRequest, IncomingClient Client, ProxProtocolMessage RequestMessage, out ProxProtocolMessage ErrorResponse)
{
log.Trace("()");
bool res = false;
ErrorResponse = null;
string details = null;
if (CreateActivityRequest == null)
{
CreateActivityRequest = new CreateActivityRequest();
}
if (CreateActivityRequest.Activity == null)
{
CreateActivityRequest.Activity = new ActivityInformation();
}
if (CreateActivityRequest.Activity.ProfileServerContact == null)
{
CreateActivityRequest.Activity.ProfileServerContact = new ServerContactInfo();
}
SignedActivityInformation signedActivity = new SignedActivityInformation()
{
Activity = CreateActivityRequest.Activity,
Signature = RequestMessage.Request.ConversationRequest.Signature
};
if (ValidateSignedActivityInformation(signedActivity, Client.PublicKey, Client.MessageBuilder, RequestMessage, "", false, out ErrorResponse))
{
byte[] ownerPubKey = CreateActivityRequest.Activity.OwnerPublicKey.ToByteArray();
if (!ByteArrayComparer.Equals(Client.PublicKey, ownerPubKey))
{
log.Debug("Client's public key '{0}' does not match activity owner's public key '{1}'.", Client.PublicKey.ToHex(), ownerPubKey.ToHex());
details = "activity.ownerPublicKey";
}
if (details == null)
{
int index = 0;
foreach (ByteString serverId in CreateActivityRequest.IgnoreServerIds)
{
if (serverId.Length != ProtocolHelper.NetworkIdentifierLength)
{
log.Debug("Ignored server ID #{0} is not a valid network ID as its length is {1} bytes.", index, serverId.Length);
details = "ignoreServerIds";
break;
}
index++;
}
}
if (details == null)
{
res = true;
}
else
{
ErrorResponse = Client.MessageBuilder.CreateErrorInvalidValueResponse(RequestMessage, details);
}
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Verifies that client's request was not sent against the protocol rules - i.e. that the role server
/// that received the message is serving the role the message was designed for and that the conversation
/// status with the clients matches the required status for the particular message.
/// </summary>
/// <param name="Client">Client that sent the request.</param>
/// <param name="RequestMessage">Full request message.</param>
/// <param name="RequiredRole">Server role required for the message, or null if all roles servers can handle this message.</param>
/// <param name="RequiredConversationStatus">Required conversation status for the message, or null for single messages.</param>
/// <param name="ResponseMessage">If the verification fails, this is filled with error response to be sent to the client.</param>
/// <returns>true if the function succeeds (i.e. required conditions are met and the message can be processed), false otherwise.</returns>
public bool CheckSessionConditions(IncomingClient Client, ProxProtocolMessage RequestMessage, ServerRole?RequiredRole, ClientConversationStatus?RequiredConversationStatus, out ProxProtocolMessage ResponseMessage)
{
log.Trace("(RequiredRole:{0},RequiredConversationStatus:{1})", RequiredRole != null ? RequiredRole.ToString() : "null", RequiredConversationStatus != null ? RequiredConversationStatus.Value.ToString() : "null");
bool res = false;
ResponseMessage = null;
string requestName = RequestMessage.Request.ConversationTypeCase == Request.ConversationTypeOneofCase.SingleRequest ? "single request " + RequestMessage.Request.SingleRequest.RequestTypeCase.ToString() : "conversation request " + RequestMessage.Request.ConversationRequest.RequestTypeCase.ToString();
// RequiredRole contains one or more roles and the current server has to have at least one of them.
if ((RequiredRole == null) || ((roleServer.Roles & (uint)RequiredRole.Value) != 0))
{
if (RequiredConversationStatus == null)
{
res = true;
}
else
{
switch (RequiredConversationStatus.Value)
{
case ClientConversationStatus.NoConversation:
case ClientConversationStatus.ConversationStarted:
res = Client.ConversationStatus == RequiredConversationStatus.Value;
if (!res)
{
log.Warn("Client sent {0} but the conversation status is {1}.", requestName, Client.ConversationStatus);
ResponseMessage = Client.MessageBuilder.CreateErrorBadConversationStatusResponse(RequestMessage);
}
break;
case ClientConversationStatus.Verified:
res = Client.ConversationStatus == RequiredConversationStatus.Value;
if (!res)
{
log.Warn("Client sent {0} but the conversation status is {1}.", requestName, Client.ConversationStatus);
ResponseMessage = Client.MessageBuilder.CreateErrorUnauthorizedResponse(RequestMessage);
}
break;
case ClientConversationStatus.ConversationAny:
res = (Client.ConversationStatus == ClientConversationStatus.ConversationStarted) ||
(Client.ConversationStatus == ClientConversationStatus.Verified);
if (!res)
{
log.Warn("Client sent {0} but the conversation status is {1}.", requestName, Client.ConversationStatus);
ResponseMessage = Client.MessageBuilder.CreateErrorBadConversationStatusResponse(RequestMessage);
}
break;
default:
log.Error("Unknown conversation status '{0}'.", Client.ConversationStatus);
ResponseMessage = Client.MessageBuilder.CreateErrorInternalResponse(RequestMessage);
break;
}
}
}
else
{
log.Warn("Received {0} on server without {1} role(s) (server roles are {2}).", requestName, RequiredRole.Value, roleServer.Roles);
ResponseMessage = Client.MessageBuilder.CreateErrorBadRoleResponse(RequestMessage);
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Validates incoming update item during the neighborhood initialization process with in-memory database of activities from the neighbor.
/// </summary>
/// <param name="AddItem">Update item to validate.</param>
/// <param name="Index">Index of the update item in the message.</param>
/// <param name="ActivityDatabase">In-memory temporary database of activities from the neighbor server that were already received and processed.</param>
/// <param name="MessageBuilder">Client's network message builder.</param>
/// <param name="RequestMessage">Full request message received by the client.</param>
/// <param name="ErrorResponse">If the validation fails, this is filled with response message to be sent to the neighbor.</param>
/// <returns>true if the validation is successful, false otherwise.</returns>
public static bool ValidateInMemorySharedActivityActivityInformation(SharedActivityAddItem AddItem, int Index, Dictionary <string, NeighborActivity> ActivityDatabase, ProxMessageBuilder MessageBuilder, ProxProtocolMessage RequestMessage, out ProxProtocolMessage ErrorResponse)
{
log.Trace("(Index:{0})", Index);
bool res = false;
ErrorResponse = null;
if (AddItem == null)
{
AddItem = new SharedActivityAddItem();
}
if (AddItem.SignedActivity == null)
{
AddItem.SignedActivity = new SignedActivityInformation();
}
if (AddItem.SignedActivity.Activity == null)
{
AddItem.SignedActivity.Activity = new ActivityInformation();
}
byte[] ownerIdentityPubKey = AddItem.SignedActivity.Activity.OwnerPublicKey.ToByteArray();
if (ValidateSignedActivityInformation(AddItem.SignedActivity, ownerIdentityPubKey, MessageBuilder, RequestMessage, Index.ToString() + ".add.signedActivity.", true, out ErrorResponse))
{
string details = null;
if (ActivityDatabase.Count >= ActivityBase.MaxPrimaryActivities)
{
log.Debug("Target server already sent too many activities.");
details = "add";
}
if (details == null)
{
byte[] identityId = Crypto.Sha256(ownerIdentityPubKey);
NeighborActivity na = new NeighborActivity()
{
ActivityId = AddItem.SignedActivity.Activity.Id,
OwnerIdentityId = identityId
};
string activityFullId = na.GetFullId();
if (ActivityDatabase.ContainsKey(activityFullId))
{
log.Debug("Activity full ID '{0}' (public key '{1}') already exists.", activityFullId, ownerIdentityPubKey.ToHex());
details = "add.signedActivity.activity.id";
}
}
if (details == null)
{
res = true;
}
else
{
ErrorResponse = MessageBuilder.CreateErrorInvalidValueResponse(RequestMessage, Index.ToString() + "." + details);
}
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Validates incoming SharedActivityDeleteItem update item.
/// </summary>
/// <para>This function does not verify whether the activity exists.</para>
/// <param name="DeleteItem">Delete item to validate.</param>
/// <param name="Index">Item index in the update message.</param>
/// <param name="UsedFullActivityIdsInBatch">List of activity full IDs of already validated items of this batch.</param>
/// <param name="MessageBuilder">Client's network message builder.</param>
/// <param name="RequestMessage">Full request message received by the client.</param>
/// <param name="ErrorResponse">If the validation fails, this is filled with response message to be sent to the neighbor.</param>
/// <returns>true if the validation is successful, false otherwise.</returns>
public static bool ValidateSharedActivityDeleteItem(SharedActivityDeleteItem DeleteItem, int Index, HashSet <string> UsedFullActivityIdsInBatch, ProxMessageBuilder MessageBuilder, ProxProtocolMessage RequestMessage, out ProxProtocolMessage ErrorResponse)
{
log.Trace("(Index:{0})", Index);
bool res = false;
ErrorResponse = null;
if (DeleteItem == null)
{
DeleteItem = new SharedActivityDeleteItem();
}
string details = null;
uint activityId = DeleteItem.Id;
// 0 is not a valid activity identifier.
if (activityId == 0)
{
log.Debug("Invalid activity ID '{0}'.", activityId);
details = "delete.id";
}
if (details == null)
{
byte[] identityId = DeleteItem.OwnerNetworkId.ToByteArray();
bool identityIdValid = identityId.Length == ProtocolHelper.NetworkIdentifierLength;
if (identityIdValid)
{
NeighborActivity na = new NeighborActivity()
{
ActivityId = DeleteItem.Id,
OwnerIdentityId = identityId
};
string activityFullId = na.GetFullId();
if (!UsedFullActivityIdsInBatch.Contains(activityFullId))
{
UsedFullActivityIdsInBatch.Add(activityFullId);
}
else
{
log.Debug("Activity full ID '{0}' already processed in this request.", activityFullId);
details = "delete.id";
}
}
else
{
log.Debug("Invalid owner network ID length '{0}'.", identityId.Length);
details = "delete.ownerNetworkId";
}
}
if (details == null)
{
res = true;
}
else
{
ErrorResponse = MessageBuilder.CreateErrorInvalidValueResponse(RequestMessage, Index.ToString() + "." + details);
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Validates incoming SharedActivityChangeItem update item.
/// <para>This function does not verify whether the activity exists.
/// It also does not verify whether the new activity start time and expiration time are correct if they are not both changed.</para>
/// </summary>
/// <param name="ChangeItem">Change item to validate.</param>
/// <param name="Index">Item index in the update message.</param>
/// <param name="UsedFullActivityIdsInBatch">List of activity full IDs of already validated items of this batch.</param>
/// <param name="MessageBuilder">Client's network message builder.</param>
/// <param name="RequestMessage">Full request message received by the client.</param>
/// <param name="ErrorResponse">If the validation fails, this is filled with response message to be sent to the neighbor.</param>
/// <returns>true if the validation is successful, false otherwise.</returns>
public static bool ValidateSharedActivityChangeItem(SharedActivityChangeItem ChangeItem, int Index, HashSet <string> UsedFullActivityIdsInBatch, ProxMessageBuilder MessageBuilder, ProxProtocolMessage RequestMessage, out ProxProtocolMessage ErrorResponse)
{
log.Trace("(Index:{0})", Index);
bool res = false;
ErrorResponse = null;
if (ChangeItem == null)
{
ChangeItem = new SharedActivityChangeItem();
}
if (ChangeItem.SignedActivity == null)
{
ChangeItem.SignedActivity = new SignedActivityInformation();
}
if (ChangeItem.SignedActivity.Activity == null)
{
ChangeItem.SignedActivity.Activity = new ActivityInformation();
}
byte[] ownerIdentityPubKey = ChangeItem.SignedActivity.Activity.OwnerPublicKey.ToByteArray();
if (ValidateSignedActivityInformation(ChangeItem.SignedActivity, ownerIdentityPubKey, MessageBuilder, RequestMessage, Index.ToString() + ".change.signedActivity.", true, out ErrorResponse))
{
string details = null;
byte[] identityId = Crypto.Sha256(ownerIdentityPubKey);
NeighborActivity na = new NeighborActivity()
{
ActivityId = ChangeItem.SignedActivity.Activity.Id,
OwnerIdentityId = identityId
};
string activityFullId = na.GetFullId();
if (!UsedFullActivityIdsInBatch.Contains(activityFullId))
{
UsedFullActivityIdsInBatch.Add(activityFullId);
}
else
{
log.Debug("Activity full ID '{0}' already processed in this request.", activityFullId);
details = "change.signedActivity.activity.id";
}
if (details == null)
{
res = true;
}
else
{
ErrorResponse = MessageBuilder.CreateErrorInvalidValueResponse(RequestMessage, Index.ToString() + "." + details);
}
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Validates incoming SharedActivityUpdateItem update item.
/// </summary>
/// <param name="UpdateItem">Update item to validate.</param>
/// <param name="Index">Item index in the update message.</param>
/// <param name="SharedActivitiesCount">Number of activities the neighbor already shares with the activity server.</param>
/// <param name="UsedFullActivityIdsInBatch">List of activity full IDs of already validated items of this batch.</param>
/// <param name="MessageBuilder">Client's network message builder.</param>
/// <param name="RequestMessage">Full request message received by the client.</param>
/// <param name="ErrorResponse">If the validation fails, this is filled with response message to be sent to the neighbor.</param>
/// <returns>true if the validation is successful, false otherwise.</returns>
public static bool ValidateSharedActivityUpdateItem(SharedActivityUpdateItem UpdateItem, int Index, int SharedActivitiesCount, HashSet <string> UsedFullActivityIdsInBatch, ProxMessageBuilder MessageBuilder, ProxProtocolMessage RequestMessage, out ProxProtocolMessage ErrorResponse)
{
log.Trace("(Index:{0},SharedActivitiesCount:{1})", Index, SharedActivitiesCount);
bool res = false;
ErrorResponse = null;
switch (UpdateItem.ActionTypeCase)
{
case SharedActivityUpdateItem.ActionTypeOneofCase.Add:
res = ValidateSharedActivityAddItem(UpdateItem.Add, Index, SharedActivitiesCount, UsedFullActivityIdsInBatch, MessageBuilder, RequestMessage, out ErrorResponse);
break;
case SharedActivityUpdateItem.ActionTypeOneofCase.Change:
res = ValidateSharedActivityChangeItem(UpdateItem.Change, Index, UsedFullActivityIdsInBatch, MessageBuilder, RequestMessage, out ErrorResponse);
break;
case SharedActivityUpdateItem.ActionTypeOneofCase.Delete:
res = ValidateSharedActivityDeleteItem(UpdateItem.Delete, Index, UsedFullActivityIdsInBatch, MessageBuilder, RequestMessage, out ErrorResponse);
break;
case SharedActivityUpdateItem.ActionTypeOneofCase.Refresh:
res = true;
break;
default:
ErrorResponse = MessageBuilder.CreateErrorProtocolViolationResponse(RequestMessage);
res = false;
break;
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Checks whether the activity search request is valid.
/// </summary>
/// <param name="ActivitySearchRequest">Activity search request part of the client's request message.</param>
/// <param name="MessageBuilder">Client's network message builder.</param>
/// <param name="RequestMessage">Full request message from client.</param>
/// <param name="ErrorResponse">If the function fails, this is filled with error response message that is ready to be sent to the client.</param>
/// <returns>true if the search request is valid, false otherwise.</returns>
public static bool ValidateActivitySearchRequest(ActivitySearchRequest ActivitySearchRequest, ProxMessageBuilder MessageBuilder, ProxProtocolMessage RequestMessage, out ProxProtocolMessage ErrorResponse)
{
log.Trace("()");
bool res = false;
ErrorResponse = null;
string details = null;
int responseResultLimit = ProxMessageProcessor.ActivitySearchMaxResponseRecords;
int totalResultLimit = ProxMessageProcessor.ActivitySearchMaxTotalRecords;
bool maxResponseRecordCountValid = (1 <= ActivitySearchRequest.MaxResponseRecordCount) &&
(ActivitySearchRequest.MaxResponseRecordCount <= responseResultLimit);
if (!maxResponseRecordCountValid)
{
log.Debug("Invalid maxResponseRecordCount value '{0}'.", ActivitySearchRequest.MaxResponseRecordCount);
details = "maxResponseRecordCount";
}
if (details == null)
{
bool maxTotalRecordCountValid = (1 <= ActivitySearchRequest.MaxTotalRecordCount) &&
(ActivitySearchRequest.MaxTotalRecordCount <= totalResultLimit) &&
(ActivitySearchRequest.MaxResponseRecordCount <= ActivitySearchRequest.MaxTotalRecordCount);
if (!maxTotalRecordCountValid)
{
log.Debug("Invalid maxTotalRecordCount value '{0}'.", ActivitySearchRequest.MaxTotalRecordCount);
details = "maxTotalRecordCount";
}
}
if ((details == null) && (ActivitySearchRequest.OwnerNetworkId.Length > 0))
{
bool ownerNetworkIdValid = ActivitySearchRequest.OwnerNetworkId.Length == ProtocolHelper.NetworkIdentifierLength;
if (!ownerNetworkIdValid)
{
log.Debug("Invalid owner network ID length '{0}'.", ActivitySearchRequest.OwnerNetworkId.Length);
details = "ownerNetworkId";
}
}
if ((details == null) && (ActivitySearchRequest.Type != null))
{
bool typeValid = Encoding.UTF8.GetByteCount(ActivitySearchRequest.Type) <= ProxMessageBuilder.MaxActivitySearchTypeLengthBytes;
if (!typeValid)
{
log.Debug("Invalid type value length '{0}'.", ActivitySearchRequest.Type.Length);
details = "type";
}
}
if ((details == null) && ((ActivitySearchRequest.StartNotAfter != 0) || (ActivitySearchRequest.ExpirationNotBefore != 0)))
{
DateTime?startNotAfter = null;
DateTime?expirationNotBefore = null;
if (ActivitySearchRequest.StartNotAfter != 0)
{
startNotAfter = ProtocolHelper.UnixTimestampMsToDateTime(ActivitySearchRequest.StartNotAfter);
bool startNotAfterValid = startNotAfter != null;
if (!startNotAfterValid)
{
log.Debug("Start not after {0} is not a valid timestamp value.", ActivitySearchRequest.StartNotAfter);
details = "startNotAfter";
}
}
if ((details == null) && (ActivitySearchRequest.ExpirationNotBefore != 0))
{
expirationNotBefore = ProtocolHelper.UnixTimestampMsToDateTime(ActivitySearchRequest.ExpirationNotBefore);
bool expirationNotBeforeValid = expirationNotBefore != null;
if (!expirationNotBeforeValid)
{
log.Debug("Expiration not before {0} is not a valid timestamp value.", ActivitySearchRequest.ExpirationNotBefore);
details = "expirationNotBefore";
}
else if (ActivitySearchRequest.StartNotAfter != 0)
{
expirationNotBeforeValid = ActivitySearchRequest.StartNotAfter <= ActivitySearchRequest.ExpirationNotBefore;
if (!expirationNotBeforeValid)
{
log.Debug("Expiration not before {0} is smaller than start not after {1}.", ActivitySearchRequest.StartNotAfter, ActivitySearchRequest.ExpirationNotBefore);
details = "expirationNotBefore";
}
}
}
}
if ((details == null) && (ActivitySearchRequest.Latitude != GpsLocation.NoLocationLocationType))
{
GpsLocation locLat = new GpsLocation(ActivitySearchRequest.Latitude, 0);
GpsLocation locLong = new GpsLocation(0, ActivitySearchRequest.Longitude);
if (!locLat.IsValid())
{
log.Debug("Latitude '{0}' is not a valid GPS latitude value.", ActivitySearchRequest.Latitude);
details = "latitude";
}
else if (!locLong.IsValid())
{
log.Debug("Longitude '{0}' is not a valid GPS longitude value.", ActivitySearchRequest.Longitude);
details = "longitude";
}
}
if ((details == null) && (ActivitySearchRequest.Latitude != GpsLocation.NoLocationLocationType))
{
bool radiusValid = ActivitySearchRequest.Radius > 0;
if (!radiusValid)
{
log.Debug("Invalid radius value '{0}'.", ActivitySearchRequest.Radius);
details = "radius";
}
}
if ((details == null) && (ActivitySearchRequest.ExtraData != null))
{
bool validLength = (Encoding.UTF8.GetByteCount(ActivitySearchRequest.ExtraData) <= ProxMessageBuilder.MaxActivitySearchExtraDataLengthBytes);
bool extraDataValid = RegexTypeValidator.ValidateRegex(ActivitySearchRequest.ExtraData);
if (!validLength || !extraDataValid)
{
log.Debug("Invalid extraData regular expression filter.");
details = "extraData";
}
}
if (details == null)
{
res = true;
}
else
{
ErrorResponse = MessageBuilder.CreateErrorInvalidValueResponse(RequestMessage, details);
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Checks whether the incoming response is a reponse to a specific request and if the reported status is OK.
/// <para>This function sets the last error.</para>
/// </summary>
/// <param name="RequestMessage">Request message for which the response was received.</param>
/// <param name="ResponseMessage">Response message received.</param>
/// <returns>true if the response is valid and its status is OK.</returns>
public bool CheckResponseMessage(ProxProtocolMessage RequestMessage, ProxProtocolMessage ResponseMessage)
{
log.Trace("()");
bool res = false;
if (ResponseMessage != null)
{
if (ResponseMessage.Id == RequestMessage.Id)
{
if (ResponseMessage.MessageTypeCase == Message.MessageTypeOneofCase.Response)
{
Response response = ResponseMessage.Response;
if (response.Status == Status.Ok)
{
switch (response.ConversationTypeCase)
{
case Response.ConversationTypeOneofCase.SingleResponse:
if (RequestMessage.Request.ConversationTypeCase == Request.ConversationTypeOneofCase.SingleRequest)
{
SingleRequest.RequestTypeOneofCase requestType = RequestMessage.Request.SingleRequest.RequestTypeCase;
if (response.SingleResponse.ResponseTypeCase.ToString() == requestType.ToString())
{
res = true;
}
else
{
log.Debug("Single response type {0} does not match single request type {1}.", response.SingleResponse.ResponseTypeCase, requestType);
}
}
else
{
log.Debug("Response message conversation type {0} does not match request message conversation type {1}.", response.ConversationTypeCase, RequestMessage.Request.ConversationTypeCase);
}
break;
case Response.ConversationTypeOneofCase.ConversationResponse:
if (RequestMessage.Request.ConversationTypeCase == Request.ConversationTypeOneofCase.ConversationRequest)
{
ConversationRequest.RequestTypeOneofCase requestType = RequestMessage.Request.ConversationRequest.RequestTypeCase;
if (response.ConversationResponse.ResponseTypeCase.ToString() == requestType.ToString())
{
res = true;
}
else
{
log.Debug("Conversation response type {0} does not match conversation request type {1}.", response.ConversationResponse.ResponseTypeCase, requestType);
}
}
else
{
log.Debug("Response message conversation type {0} does not match request message conversation type {1}.", response.ConversationTypeCase, RequestMessage.Request.ConversationTypeCase);
}
break;
default:
log.Error("Invalid response conversation type {0}.", ResponseMessage.Response.ConversationTypeCase);
break;
}
}
else
{
log.Debug("Response message status is {0}.", ResponseMessage.Response.Status);
}
}
else
{
log.Debug("Received message is not response, its message type is {0}.", ResponseMessage.MessageTypeCase);
}
}
else
{
log.Debug("Response message ID {0} does not match request message ID {1}.", ResponseMessage.Id, RequestMessage.Id);
}
}
else
{
log.Debug("Response message is null.");
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Checks whether a signed activity information is valid.
/// </summary>
/// <param name="SignedActivity">Signed activity information to check.</param>
/// <param name="OwnerIdentityPublicKey">Public key of the activity's owner identity.</param>
/// <param name="MessageBuilder">Client's network message builder.</param>
/// <param name="RequestMessage">Full request message from client.</param>
/// <param name="ErrorPrefix">Prefix to add to the validation error details.</param>
/// <param name="InvalidSignatureToDetails">If set to true, invalid signature error will be reported as invalid value in signature field.</param>
/// <param name="ErrorResponse">If the function fails, this is filled with error response message that is ready to be sent to the client.</param>
/// <returns>true if the signed activity information is valid and signed correctly by the given identity, false otherwise.</returns>
public static bool ValidateSignedActivityInformation(SignedActivityInformation SignedActivity, byte[] OwnerIdentityPublicKey, ProxMessageBuilder MessageBuilder, ProxProtocolMessage RequestMessage, string ErrorPrefix, bool InvalidSignatureToDetails, out ProxProtocolMessage ErrorResponse)
{
log.Trace("()");
ErrorResponse = null;
if (SignedActivity == null)
{
SignedActivity = new SignedActivityInformation();
}
if (SignedActivity.Activity == null)
{
SignedActivity.Activity = new ActivityInformation();
}
bool res = false;
if (ValidateActivityInformation(SignedActivity.Activity, OwnerIdentityPublicKey, MessageBuilder, RequestMessage, ErrorPrefix + "activity.", out ErrorResponse))
{
// ActivityBase.InternalInvalidActivityType is a special internal type of activity that we use to prevent problems in the network.
// This is not an elegant solution.
// See NeighborhoodActionProcessor.NeighborhoodActivityUpdateAsync case NeighborhoodActionType.AddActivity for more information.
if (SignedActivity.Activity.Type != ActivityBase.InternalInvalidActivityType)
{
byte[] signature = SignedActivity.Signature.ToByteArray();
byte[] data = SignedActivity.Activity.ToByteArray();
if (Ed25519.Verify(signature, data, OwnerIdentityPublicKey))
{
res = true;
}
else
{
ErrorResponse = InvalidSignatureToDetails ? MessageBuilder.CreateErrorInvalidValueResponse(RequestMessage, ErrorPrefix + "signature") : MessageBuilder.CreateErrorInvalidSignatureResponse(RequestMessage);
}
}
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Processes StartConversationRequest message from client.
/// <para>Initiates a conversation with the client provided that there is a common version of the protocol supported by both sides.</para>
/// </summary>
/// <param name="Client">Client that sent the request.</param>
/// <param name="RequestMessage">Full request message.</param>
/// <returns>Response message to be sent to the client.</returns>
public ProxProtocolMessage ProcessMessageStartConversationRequest(IncomingClient Client, ProxProtocolMessage RequestMessage)
{
log.Trace("()");
ProxProtocolMessage res = null;
if (!CheckSessionConditions(Client, RequestMessage, null, ClientConversationStatus.NoConversation, out res))
{
log.Trace("(-):*.Response.Status={0}", res.Response.Status);
return(res);
}
ProxMessageBuilder messageBuilder = Client.MessageBuilder;
StartConversationRequest startConversationRequest = RequestMessage.Request.ConversationRequest.Start;
byte[] clientChallenge = startConversationRequest.ClientChallenge.ToByteArray();
byte[] pubKey = startConversationRequest.PublicKey.ToByteArray();
if (clientChallenge.Length == ProxMessageBuilder.ChallengeDataSize)
{
if ((0 < pubKey.Length) && (pubKey.Length <= ProtocolHelper.MaxPublicKeyLengthBytes))
{
SemVer version;
if (GetCommonSupportedVersion(startConversationRequest.SupportedVersions, out version))
{
Client.PublicKey = pubKey;
Client.IdentityId = Crypto.Sha256(Client.PublicKey);
if (clientList.AddNetworkPeerWithIdentity(Client))
{
Client.MessageBuilder.SetProtocolVersion(version);
byte[] challenge = new byte[ProxMessageBuilder.ChallengeDataSize];
Crypto.Rng.GetBytes(challenge);
Client.AuthenticationChallenge = challenge;
Client.ConversationStatus = ClientConversationStatus.ConversationStarted;
log.Debug("Client {0} conversation status updated to {1}, selected version is '{2}', client public key set to '{3}', client identity ID set to '{4}', challenge set to '{5}'.",
Client.RemoteEndPoint, Client.ConversationStatus, version, Client.PublicKey.ToHex(), Client.IdentityId.ToHex(), Client.AuthenticationChallenge.ToHex());
res = messageBuilder.CreateStartConversationResponse(RequestMessage, version, Config.Configuration.Keys.PublicKey, Client.AuthenticationChallenge, clientChallenge);
}
else
{
res = messageBuilder.CreateErrorInternalResponse(RequestMessage);
}
}
else
{
log.Warn("Client and server are incompatible in protocol versions.");
res = messageBuilder.CreateErrorUnsupportedResponse(RequestMessage);
}
}
else
{
log.Warn("Client send public key of invalid length of {0} bytes.", pubKey.Length);
res = messageBuilder.CreateErrorInvalidValueResponse(RequestMessage, "publicKey");
}
}
else
{
log.Warn("Client send clientChallenge, which is {0} bytes long, but it should be {1} bytes long.", clientChallenge.Length, ProxMessageBuilder.ChallengeDataSize);
res = messageBuilder.CreateErrorInvalidValueResponse(RequestMessage, "clientChallenge");
}
log.Trace("(-):*.Response.Status={0}", res.Response.Status);
return(res);
}
/// <summary>
/// Validates ActivityInformation structure by itself. This function does not touch database and does not validate
/// anything that depends on the context.
/// </summary>
/// <param name="Activity">Description of the activity to validate.</param>
/// <param name="OwnerIdentityPublicKey">Public key of the activity's owner identity.</param>
/// <param name="MessageBuilder">Network message builder of the client who sent this activity description.</param>
/// <param name="RequestMessage">Full request message from client.</param>
/// <param name="ErrorPrefix">Prefix to add to the validation error details.</param>
/// <param name="ErrorResponse">If the function fails, this is filled with error response message that is ready to be sent to the client.</param>
/// <returns>true if the activity information is valid, false otherwise.</returns>
public static bool ValidateActivityInformation(ActivityInformation Activity, byte[] OwnerIdentityPublicKey, ProxMessageBuilder MessageBuilder, ProxProtocolMessage RequestMessage, string ErrorPrefix, out ProxProtocolMessage ErrorResponse)
{
log.Trace("()");
bool res = false;
ErrorResponse = null;
string details = null;
if (Activity == null)
{
Activity = new ActivityInformation();
}
if (Activity.ProfileServerContact == null)
{
Activity.ProfileServerContact = new ServerContactInfo();
}
SemVer version = new SemVer(Activity.Version);
// Currently only supported version is 1.0.0.
if (!version.Equals(SemVer.V100))
{
log.Debug("Unsupported version '{0}'.", version);
details = "version";
}
if (details == null)
{
uint activityId = Activity.Id;
// 0 is not a valid activity identifier.
if (activityId == 0)
{
log.Debug("Invalid activity ID '{0}'.", activityId);
details = "id";
}
}
if (details == null)
{
byte[] pubKey = Activity.OwnerPublicKey.ToByteArray();
bool pubKeyValid = (0 < pubKey.Length) && (pubKey.Length <= ProtocolHelper.MaxPublicKeyLengthBytes) && ByteArrayComparer.Equals(OwnerIdentityPublicKey, pubKey);
if (!pubKeyValid)
{
log.Debug("Invalid public key '{0}' does not match identity public key '{1}'.", pubKey.ToHex(), OwnerIdentityPublicKey.ToHex());
details = "ownerPublicKey";
}
}
if (details == null)
{
ServerContactInfo sci = Activity.ProfileServerContact;
bool networkIdValid = sci.NetworkId.Length == ProtocolHelper.NetworkIdentifierLength;
IPAddress ipAddress = IPAddressExtensions.IpFromBytes(sci.IpAddress.ToByteArray());
bool ipAddressValid = (ipAddress != null) && (Config.Configuration.TestModeEnabled || !ipAddress.IsReservedOrLocal());
bool portValid = (1 <= sci.PrimaryPort) && (sci.PrimaryPort <= 65535);
if (!networkIdValid || !ipAddressValid || !portValid)
{
log.Debug("Profile server contact's network ID is {0}, IP address is {1}, port is {2}.", networkIdValid ? "valid" : "invalid", ipAddressValid ? "valid" : "invalid", portValid ? "valid" : "invalid");
if (!networkIdValid)
{
details = "profileServerContact.networkId";
}
else if (!ipAddressValid)
{
details = "profileServerContact.ipAddress";
}
else if (!portValid)
{
details = "profileServerContact.primaryPort";
}
}
}
if (details == null)
{
string activityType = Activity.Type;
if (activityType == null)
{
activityType = "";
}
int byteLen = Encoding.UTF8.GetByteCount(activityType);
bool activityTypeValid = (0 < byteLen) && (byteLen <= ProxMessageBuilder.MaxActivityTypeLengthBytes);
if (!activityTypeValid)
{
log.Debug("Activity type too long or zero length ({0} bytes, limit is {1}).", byteLen, ProxMessageBuilder.MaxActivityTypeLengthBytes);
details = "type";
}
}
if (details == null)
{
GpsLocation locLat = new GpsLocation(Activity.Latitude, 0);
GpsLocation locLong = new GpsLocation(0, Activity.Longitude);
if (!locLat.IsValid())
{
log.Debug("Latitude '{0}' is not a valid GPS latitude value.", Activity.Latitude);
details = "latitude";
}
else if (!locLong.IsValid())
{
log.Debug("Longitude '{0}' is not a valid GPS longitude value.", Activity.Longitude);
details = "longitude";
}
}
if (details == null)
{
uint precision = Activity.Precision;
bool precisionValid = (0 <= precision) && (precision <= ProxMessageBuilder.MaxLocationPrecision);
if (!precisionValid)
{
log.Debug("Precision '{0}' is not an integer between 0 and {1}.", precision, ProxMessageBuilder.MaxLocationPrecision);
details = "precision";
}
}
if (details == null)
{
DateTime?startTime = ProtocolHelper.UnixTimestampMsToDateTime(Activity.StartTime);
DateTime?expirationTime = ProtocolHelper.UnixTimestampMsToDateTime(Activity.ExpirationTime);
if (startTime == null)
{
log.Debug("Invalid activity start time timestamp '{0}'.", Activity.StartTime);
details = "startTime";
}
else if (expirationTime == null)
{
log.Debug("Invalid activity expiration time timestamp '{0}'.", Activity.ExpirationTime);
details = "expirationTime";
}
else
{
if (startTime > expirationTime)
{
log.Debug("Activity expiration time has to be greater than or equal to its start time.");
details = "expirationTime";
}
else if (expirationTime.Value > DateTime.UtcNow.AddHours(ActivityBase.MaxActivityLifeTimeHours))
{
log.Debug("Activity expiration time {0} is more than {1} hours in the future.", expirationTime.Value.ToString("yyyy-MM-dd HH:mm:ss"), ActivityBase.MaxActivityLifeTimeHours);
details = "expirationTime";
}
}
}
if (details == null)
{
string extraData = Activity.ExtraData;
if (extraData == null)
{
extraData = "";
}
// Extra data is semicolon separated 'key=value' list, max ActivityBase.MaxActivityExtraDataLengthBytes bytes long.
int byteLen = Encoding.UTF8.GetByteCount(extraData);
if (byteLen > ProxMessageBuilder.MaxActivityExtraDataLengthBytes)
{
log.Debug("Extra data too large ({0} bytes, limit is {1}).", byteLen, ProxMessageBuilder.MaxActivityExtraDataLengthBytes);
details = "extraData";
}
}
if (details == null)
{
res = true;
}
else
{
ErrorResponse = MessageBuilder.CreateErrorInvalidValueResponse(RequestMessage, ErrorPrefix + details);
}
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Processing of a message received from a client.
/// </summary>
/// <param name="Client">TCP client who send the message.</param>
/// <param name="IncomingMessage">Full ProtoBuf message to be processed.</param>
/// <returns>true if the conversation with the client should continue, false if a protocol violation error occurred and the client should be disconnected.</returns>
public async Task <bool> ProcessMessageAsync(ClientBase Client, IProtocolMessage IncomingMessage)
{
IncomingClient client = (IncomingClient)Client;
ProxProtocolMessage incomingMessage = (ProxProtocolMessage)IncomingMessage;
ProxMessageBuilder messageBuilder = client.MessageBuilder;
bool res = false;
log.Debug("()");
try
{
// Update time until this client's connection is considered inactive.
client.NextKeepAliveTime = DateTime.UtcNow.AddMilliseconds(client.KeepAliveIntervalMs);
log.Trace("Client ID {0} NextKeepAliveTime updated to {1}.", client.Id.ToHex(), client.NextKeepAliveTime.ToString("yyyy-MM-dd HH:mm:ss"));
log.Trace("Received message type is {0}, message ID is {1}.", incomingMessage.MessageTypeCase, incomingMessage.Id);
switch (incomingMessage.MessageTypeCase)
{
case Message.MessageTypeOneofCase.Request:
{
ProxProtocolMessage responseMessage = messageBuilder.CreateErrorProtocolViolationResponse(incomingMessage);
Request request = incomingMessage.Request;
log.Trace("Request conversation type is {0}.", request.ConversationTypeCase);
switch (request.ConversationTypeCase)
{
case Request.ConversationTypeOneofCase.SingleRequest:
{
SingleRequest singleRequest = request.SingleRequest;
SemVer version = new SemVer(singleRequest.Version);
log.Trace("Single request type is {0}, version is {1}.", singleRequest.RequestTypeCase, version);
if (!version.IsValid())
{
responseMessage.Response.Details = "version";
break;
}
switch (singleRequest.RequestTypeCase)
{
case SingleRequest.RequestTypeOneofCase.Ping:
responseMessage = ProcessMessagePingRequest(client, incomingMessage);
break;
case SingleRequest.RequestTypeOneofCase.ListRoles:
responseMessage = ProcessMessageListRolesRequest(client, incomingMessage);
break;
default:
log.Warn("Invalid request type '{0}'.", singleRequest.RequestTypeCase);
break;
}
break;
}
case Request.ConversationTypeOneofCase.ConversationRequest:
{
ConversationRequest conversationRequest = request.ConversationRequest;
log.Trace("Conversation request type is {0}.", conversationRequest.RequestTypeCase);
if (conversationRequest.Signature.Length > 0)
{
log.Trace("Conversation signature is '{0}'.", conversationRequest.Signature.ToByteArray().ToHex());
}
else
{
log.Trace("No signature provided.");
}
switch (conversationRequest.RequestTypeCase)
{
case ConversationRequest.RequestTypeOneofCase.Start:
responseMessage = ProcessMessageStartConversationRequest(client, incomingMessage);
break;
case ConversationRequest.RequestTypeOneofCase.VerifyIdentity:
responseMessage = ProcessMessageVerifyIdentityRequest(client, incomingMessage);
break;
default:
log.Warn("Invalid request type '{0}'.", conversationRequest.RequestTypeCase);
// Connection will be closed in ReceiveMessageLoop.
break;
}
break;
}
default:
log.Error("Unknown conversation type '{0}'.", request.ConversationTypeCase);
// Connection will be closed in ReceiveMessageLoop.
break;
}
if (responseMessage != null)
{
// Send response to client.
res = await client.SendMessageAsync(responseMessage);
if (res)
{
// If the message was sent successfully to the target, we close the connection in case it was a protocol violation error response.
if (responseMessage.MessageTypeCase == Message.MessageTypeOneofCase.Response)
{
res = responseMessage.Response.Status != Status.ErrorProtocolViolation;
}
}
}
else
{
// If there is no response to send immediately to the client,
// we want to keep the connection open.
res = true;
}
break;
}
case Message.MessageTypeOneofCase.Response:
{
Response response = incomingMessage.Response;
log.Trace("Response status is {0}, details are '{1}', conversation type is {2}.", response.Status, response.Details, response.ConversationTypeCase);
// Find associated request. If it does not exist, disconnect the client as it
// send a response without receiving a request. This is protocol violation,
// but as this is a reponse, we have no how to inform the client about it,
// so we just disconnect it.
UnfinishedRequest unfinishedRequest = client.GetAndRemoveUnfinishedRequest(incomingMessage.Id);
if ((unfinishedRequest != null) && (unfinishedRequest.RequestMessage != null))
{
ProxProtocolMessage requestMessage = (ProxProtocolMessage)unfinishedRequest.RequestMessage;
Request request = requestMessage.Request;
// We now check whether the response message type corresponds with the request type.
// This is only valid if the status is Ok. If the message types do not match, we disconnect
// for the protocol violation again.
bool typeMatch = false;
bool isErrorResponse = response.Status != Status.Ok;
if (!isErrorResponse)
{
if (response.ConversationTypeCase == Response.ConversationTypeOneofCase.SingleResponse)
{
typeMatch = (request.ConversationTypeCase == Request.ConversationTypeOneofCase.SingleRequest) &&
((int)response.SingleResponse.ResponseTypeCase == (int)request.SingleRequest.RequestTypeCase);
}
else
{
typeMatch = (request.ConversationTypeCase == Request.ConversationTypeOneofCase.ConversationRequest) &&
((int)response.ConversationResponse.ResponseTypeCase == (int)request.ConversationRequest.RequestTypeCase);
}
}
else
{
typeMatch = true;
}
if (typeMatch)
{
// Now we know the types match, so we can rely on request type even if response is just an error.
switch (request.ConversationTypeCase)
{
case Request.ConversationTypeOneofCase.SingleRequest:
{
SingleRequest singleRequest = request.SingleRequest;
switch (singleRequest.RequestTypeCase)
{
default:
log.Warn("Invalid conversation type '{0}' of the corresponding request.", request.ConversationTypeCase);
// Connection will be closed in ReceiveMessageLoop.
break;
}
break;
}
case Request.ConversationTypeOneofCase.ConversationRequest:
{
ConversationRequest conversationRequest = request.ConversationRequest;
switch (conversationRequest.RequestTypeCase)
{
default:
log.Warn("Invalid type '{0}' of the corresponding request.", conversationRequest.RequestTypeCase);
// Connection will be closed in ReceiveMessageLoop.
break;
}
break;
}
default:
log.Error("Unknown conversation type '{0}' of the corresponding request.", request.ConversationTypeCase);
// Connection will be closed in ReceiveMessageLoop.
break;
}
}
else
{
log.Warn("Message type of the response ID {0} does not match the message type of the request ID {1}, the connection will be closed.", incomingMessage.Id, unfinishedRequest.RequestMessage.Id);
// Connection will be closed in ReceiveMessageLoop.
}
}
else
{
log.Warn("No unfinished request found for incoming response ID {0}, the connection will be closed.", incomingMessage.Id);
// Connection will be closed in ReceiveMessageLoop.
}
break;
}
default:
log.Error("Unknown message type '{0}', connection to the client will be closed.", incomingMessage.MessageTypeCase);
await SendProtocolViolation(client);
// Connection will be closed in ReceiveMessageLoop.
break;
}
}
catch (Exception e)
{
log.Error("Exception occurred, connection to the client will be closed: {0}", e.ToString());
await SendProtocolViolation(client);
// Connection will be closed in ReceiveMessageLoop.
}
if (res && client.ForceDisconnect)
{
log.Debug("Connection to the client will be forcefully closed.");
res = false;
}
log.Debug("(-):{0}", res);
return(res);
}
/// <summary>
/// Checks whether the update activity request is valid.
/// <para>This function does not verify whether the activity exists.
/// It also does not verify whether a closer proximity server exists to which the activity should be migrated.
/// It also does not verify whether the changed activity's start time will be before expiration time.</para>
/// </summary>
/// <param name="UpdateActivityRequest">Update activity request part of the client's request message.</param>
/// <param name="Client">Client that sent the request.</param>
/// <param name="RequestMessage">Full request message from client.</param>
/// <param name="ErrorResponse">If the function fails, this is filled with error response message that is ready to be sent to the client.</param>
/// <returns>true if the update activity request can be applied, false otherwise.</returns>
public static bool ValidateUpdateActivityRequest(UpdateActivityRequest UpdateActivityRequest, IncomingClient Client, ProxProtocolMessage RequestMessage, out ProxProtocolMessage ErrorResponse)
{
log.Trace("()");
bool res = false;
ErrorResponse = null;
string details = null;
if (UpdateActivityRequest == null)
{
UpdateActivityRequest = new UpdateActivityRequest();
}
if (UpdateActivityRequest.Activity == null)
{
UpdateActivityRequest.Activity = new ActivityInformation();
}
SignedActivityInformation signedActivity = new SignedActivityInformation()
{
Activity = UpdateActivityRequest.Activity,
Signature = RequestMessage.Request.ConversationRequest.Signature
};
ProxMessageBuilder messageBuilder = Client.MessageBuilder;
if (ValidateSignedActivityInformation(signedActivity, Client.PublicKey, messageBuilder, RequestMessage, "", false, out ErrorResponse))
{
if (details == null)
{
int index = 0;
foreach (ByteString serverId in UpdateActivityRequest.IgnoreServerIds)
{
if (serverId.Length != ProtocolHelper.NetworkIdentifierLength)
{
log.Debug("Ignored server ID #{0} is not a valid network ID as its length is {1} bytes.", index, serverId.Length);
details = "ignoreServerIds";
break;
}
index++;
}
}
if (details == null)
{
res = true;
}
else
{
ErrorResponse = messageBuilder.CreateErrorInvalidValueResponse(RequestMessage, details);
}
}
log.Trace("(-):{0}", res);
return(res);
}