Service Broker Dialog And Transport Security
May 25, 2006
what is the difference between the Dialog security and the transport security?
If I disable the dialog security can the messages be sent to the a different SQL server instance. As the transport security will encrypt the messages.
If I don't create a certificate to be used by the transport security can the messages be sent to another SQL server instance?
Can a message be sent to another SQL Server instance without creating a REMOTE Service Binding?
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Feb 20, 2007
If all my SQL Server instances are mutually trusted, am planning to implement transport layer security with Windows authentication. My query is that if I'm using Windows authentication do I need certificates to be created? Though I am using Transport security, I can achieve encryption by ENCRYPTION - ON in the Begin Dialogue conversation. I assume Message integrity using MD5 signatures are by default provided by Service broker irrespective of whichever service options we choose?
Can I have some article references on how these security mechanisms will impact the performace of Service broker communications?
Thanks a lot,
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Jul 23, 2007
when ever I send my message thru Service Broker I am getting an error message like this "
"Dialog security is not available for this conversation because there is no remote service binding for the target service. Create a remote service binding, or specify ENCRYPTION = OFF in the BEGIN DIALOG statement."
This I found in sys.transmission_queue
Please reply with your comments
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Aug 3, 2006
In an environment where there are many initaitors speaking to a central target with frowarders in between, from what i can understand this best policy is to disable encryption on the endpoints, since dialog encryption will be enforced this is all that is really required, is this correct.
If the endpoints used encryption the message would need to be encrypted and decrypted at each forwarder resulting in slower perfromance, where as dialog encryption would only encrypt at the sender and decrypt at the target, so is this the best way to go?
Secondly is it best practice to open a dialog initally and send messages over this dialog for years never ending the conversation? This way the services only have to authenticate eachother once, if there are no reboots etc that is of course.
I would think performance wise sending each message and ending the conversation each time is a much greater overhead ? So would it be best practice to keep dialogs open and keep sending messages ?
Initally when i was learning service broker i thought that one must send a message and end the dialog until the next message, but i think the other way is the best option ?
Is this correct ?
Thanx
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Mar 30, 2007
I am trying to send a message between to SQL Server 2005 instances on two different machines. I have checked all my routes and all my objects appear to be setup correctly. However, when running Profiler on the target machine, I receive the "This message has been dropped because the TO service could not be found. Service name: "[tcp://mydomain.com/TARGET/MyService]". Message origin: "Transport". This is my activated stored procedure that is sending the message to the target service. I am using certificate security. Any help appreciated....
CREATE PROCEDURE [usp_ProcessMessage]
AS
BEGIN
SET NOCOUNT ON;
DECLARE @conversation_handle uniqueidentifier
DECLARE @message_body AS VARBINARY(MAX)
WHILE (1=1)
BEGIN
BEGIN TRANSACTION;
WAITFOR(RECEIVE TOP (1)
@conversation_handle = conversation_handle,
@message_body = message_body
FROM [tcp://mydomain.com/INITIATE/MyQueue]
), TIMEOUT 1000;
IF (@@ROWCOUNT = 0)
BEGIN
COMMIT;
BREAK;
END
END CONVERSATION @conversation_handle
IF @message_body IS NOT NULL
BEGIN
BEGIN DIALOG CONVERSATION @conversation_handle
FROM SERVICE [tcp://mydomain.com/INITIATE/MyService]
TO SERVICE '[tcp://mydomain.com/TARGET/MyService]'
ON CONTRACT [tcp://mydomain.com/INITIATE/MyMessage/v1.0]
WITH ENCRYPTION = ON, LIFETIME = 600;
SEND ON CONVERSATION @conversation_handle
MESSAGE TYPE [tcp://mydomain.com/TARGET/VisitMessage]
(@message_body);
END
COMMIT;
END
END
GO
My endpoints are created like so:
CREATE ENDPOINT MyEndpoint
STATE = STARTED
AS TCP
(
LISTENER_PORT = 4022
)
FOR SERVICE_BROKER (AUTHENTICATION = CERTIFICATE MasterCertificate)
GO
GRANT CONNECT TO CertOwner
GRANT CONNECT ON ENDPOINT::MyEndpoint TO CertOwner
GO
And my routes like so:
GRANT SEND ON SERVICE::[tcp://mydomain.com/INITIATE/MyService] TO CertOwner
GO
CREATE REMOTE SERVICE BINDING [MyCertificateBinding]
TO SERVICE '[tcp://mydomain.com/TARGET/MyService]'
WITH USER = CertOwner,
ANONYMOUS=OFF
CREATE ROUTE [tcp://mydomain.com/INITIATE/MyRoute]
WITH SERVICE_NAME = '[tcp://mydomain.com/TARGET/MyService]',
BROKER_INSTANCE = N'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx',
ADDRESS = N'TCP://xxx.xx.xx.xx:4022'
GO
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Mar 7, 2006
I saw a posting or read a blog somewhere that mentioned custom WCF transport channels where created for interacting with ServiceBroker. Has anyone read or heard something similar? If so, where can I get them?
Thanks.
Phil
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May 31, 2007
Hi Remus,
I am experiencing the same problem, and I can't get the easy fix to work. I drop and create the DB's in between tests, so it is not related to having an old certificate in the DB, as in the case of Tilfried.
The situation is as follows:
DB1 owned by login1, has a user for login2; this DB is for the initiator
DB2 owned by login2, has a user for login1; this DB hosts the target
Both DB's have TRUSTWORTHY flag set to ON
Error in sys.transmission_queue: 'Error 916, State 3: The server principal "Login1" is not able to access the database "DB2" under the current security context.
Going on a limp, I decide to add a remote service binding in DB1, binding the user for Login2 to the target service, even though BOL explicitly states that this is only required for cross-server communications. This does change the situation - I still get an error, but a new message is sys.transmission_queue: "Dialog security is unavailable for this covnersation because there is no certificate bound to the database principal (Id: 5). Either create a certificate for the principal, or specify ENCRYPTION = OFF when beginning the conversation." I already know that the first option works, but I wanted to get the simple solution running. As for the second option, I doublechecked and the initiating procedure DOES already specify ENCRYPTION = OFF in the BEGIN DIALOG CONVERSATION command. My theory is that the remote service binding somehow forces SB to use encryption, but (a) that is not stated in the error message, and (b) if so, then how to get the messages sent over to the target service without using the binding?
==> EDIT: Just saw that you confirmed this theory in your last reply to Tlifried. So I am indeed back to having to find out how to get this to work without remote service binding - it should be possible, but how???
BTW, SELECT @@VERSION shows that I'm on build 3054, in case it matters.
Between all the errors in BOL and less than helpfull error messages produced by SB, I feel like I'm slowly losing my sanity. Please help!
Best regards,
Hugo Kornelis
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Jul 13, 2007
Hi,
I received an alert 'The SQL Server Service Broker or Database Mirroring transport is disabled or not configured'
How can I check the status of the two? and if they are disabled how do I enable them?
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Dec 29, 2006
Hi,
I would appreciate any thoughts/ideas on the following use case for the distributed service broker application we plan to migrate from our existing proprietary tcp based message protocol using database tables for reliability.
There are two ssb services running in separate sql server instances, each on a different server machine. For simplicity, let us assume the ssb endpoint names are SSBA, SSBB. SSBB is the Initiator of the Dialog while SSBA is the Target. Now the requirement is that if the underlying network communication between the two ssb endpoints(SSBA and SSBB) is broken or if the critical service SSBB is down, then processing of any incoming message into SSBA's queue from a third service broker service (say SSBEXPR) running within a SqlExpress instance should be delayed until SSBB is alive and network communication between SSBA and SSBB is established. In our existing implementation (wherein SSBA, SSBB and SSBEXPR are windows services) we use a combination of TCP socket disconnects and Heartbeat messages between SSBA and SSBB to determine the health of network connection and that of the SSBB service.
Now my understanding of how the underlying network connection for a ssb dialog works is that if there is no activity on a dialog for a certain amount of time then the underlying network connection is closed. Is there a way to specify the amount of time to say infinite value or something and thus change this behavior? My other question is how can one query the underlying network connection (i.e. a row from sys.dm_broker_connections) associated with a particular conversation? If none of this is possible, then any other patterns/ideas/approach is welcome.
Thanks,
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Sep 20, 2005
I am in the process of evaluating the use of Service broker for messaging in a load balanced configuration, and am not having any success. My configuration is as follows. 1) Master database on Box #1 which is the initiator of all dialogs 2) Target database on Box #2 3) Target database on Box #3 One of my goals is that the databases on Box #2 and #3 are as close to identical as possible. My routing table on Box #1 looks something like the following Name remote_service_name broker_instance address TargetOne TargetService
E96DC67E-F696-4D93-8545-C2E92157E32D tcp://server1:4022/ TargetTwo TargetService
56607120-26AA-4AAA-B9E4-F14689C40E41 tcp://server2:4022/ My messaging process begins with a dialog initiated from the master database (Box #1) to each of the target services. At this time, only the first server "tcp://server1:4022/" is receiving messages. The sys.transmission_queue shows a message outbound to "tcp://server2:4022/" with a blank status. I believe that my delivery problem has something to do with the resolution of the dialog certificate need for the conversation. The MSDN documentation states that: "Service Broker uses a remote service binding to locate the certificate to use for a new conversation...The certificate for user_name must correspond to the certificate for a user in the database that hosts the remote service." I am confused as to how I would configure remote service binding if one can not create more than one binding for the same remote_service_name. The following throws an exception on the last creation of the binding.
---CODE SNIP---
CREATE CERTIFICATE UFEDlgCertTargetPublic
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May 22, 2006
If I have a stored procedure that is reading data in one database and writing it to another database (same instance) are there any extra grants that I must do. I do have a user created in both databases with the same certificate (backup and create certificate from the file system) and I've done the
GRANT AUTHENTICATE TO [SessionsServiceProcedureAudit];
GRANT EXECUTE ON <the cross database stored procedure>
Gary
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Aug 24, 2007
Just tried to deploy my service broker solution to a test environment but got the following error:
An exception occurred while enqueueing a message in the target queue. Error: 15517, State: 1. Cannot execute as the database principal because the principal "dbo" does not exist, this type of principal cannot be impersonated, or you do not have permission.
Any idea as to what this error message actually means and what I would have to do to get it to work?
Thanks
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Jan 10, 2008
I am using windows authentication to send messages from one server to another.
The user is a domain user that is sysadmin on both servers and db owner of each database.
The errors I see in porfiler are as follows
At target,
An error occurred while receiving data: '10054(error not found)'.
and the following at the initiator:
Connection handshake failed. An OS call failed: (8009030c) 0x8009030c(The logon attempt failed). State 67.
For what its worth, the script for my target endpoint is below, and access has been granted to public:
CREATE ENDPOINT [BROKER]
AUTHORIZATION [MYDOMAINmssqlssb]
STATE=STARTED
AS TCP (LISTENER_PORT = 4022, LISTENER_IP = ALL)
FOR SERVICE_BROKER (MESSAGE_FORWARDING = DISABLED
, MESSAGE_FORWARD_SIZE = 10
, AUTHENTICATION = WINDOWS NEGOTIATE
, ENCRYPTION = REQUIRED ALGORITHM RC4)
I've actually used these users/objects successfully dozens of times on a seperate server with many clients...I am just re-scripting the objects here on this new server. The new remote machine is an image of one of the original machines that was working fine (with new broker GUIDs).
Thanks for any insight.
John
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May 22, 2007
hi all,
i m trying to send message between different server instance using service broker.
and for security purpose i am trying to create certificate. for that i have used makecert.exe and get a certificate and a private key. but when i am creating certificate using that file it is showing error
the code is --
CREATE CERTIFICATE ctfSourceServerMaster
FROM FILE = 'C:SourceServer.cer'
WITH PRIVATE KEY ( FILE = 'C:SourceServer.pvk', DECRYPTION BY PASSWORD = 'PrivateKeyPassword' )
ACTIVE FOR BEGIN_DIALOG = ON
GO
i have created the file SourceServer.cer' and SourceServer.pvk' by using makecert.exe tool.
the idea behind creating the certificate ctfSourceServerMaster is to give transport security.
I am running the particular script in the master database.
but still i am getting error
ERROR:----
The certificate, asymmetric key, or private key file does not exist or has invalid format.
If any body has any idea please help!!!!!!!!!!!
Thanks a lot in advance
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Sep 10, 2007
How to prevent the hang on the initator service broker if the target service broker is not started?
Our case has two service brokers (two databases), sometime, the target is need to turn off. But the sitation is the initator service broker (in fact, the message is sent from triggers) become hang, I want to prevent this case and continue to operation, and the messages should queue and will continue to send to target service broker when it startup. How should I do?
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Feb 16, 2008
Hello, I receive this error "The SQL Server Service Broker for the current database is not enabled, and as a result query notifications are not supported. Please enable the Service Broker for this database if you wish to use notifications." I attach the database in Management Studio to query and enable the broker using the scrip below but to no avail. ALTER DATABASE DataName SET ENABLE_BROKER ‘''<<------successfulandSELECT is_broker_enabled FROM sys.databases WHERE name = 'Database name' ‘'''<<-------value is 1 Global.asax ... Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs) System.Data.SqlClient.SqlDependency.Start(ConfigurationManager.ConnectionStrings("dataConnectionString1").ConnectionString) End Sub...Web.config ... <connectionStrings> <add name="dataConnectionString1" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|jbp_data.mdf;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient" /> <add name="ASPNETDBConnectionString" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|ASPNETDB.MDF;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient" /> </connectionStrings>... Hope you could help. cheers,imperialx
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Feb 19, 2007
Hi
I'm designing a distributed application where I will have SQL Server 2005 distributed databases replicating data to my central hub which is again a SQL Server 2005 database using SQL Service Broker. Data will be sent from the central hub to the distributed sites and vice versa. I need to authenticate the communication and also secure the communication by encrypting the messages. Which security shall I use? Where do I configure the type of security being used? What is the difference between transport security Vs dialogue security - Full security model?
Thanks
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Apr 5, 2007
Hi,
I am struggling with the position SSB could take in an SOA. If I would want a broker in the general sense, meaning an intermediary sitting between applications which exchange information through messaging, would SSB be a good candidate? I know Biztalk is probably the primary candidate, but in my scenario I would end up with Biztalk apps with empty orchestrations. Also, I think Biztalk is more expensive to manage. So I am looking for a lightweight broker for a simple SOA targeted at application interoperability, no fancy business processes in sight.
I look forward to some responses.
Kind regards,
Neeva
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Aug 10, 2006
Hi Remus
Thank you for the email reply.
However i am still not 100% clear, dialog security with certificates when there are hundreds of remote services seems a bit complicated.
I have a few more questions.
1. you said "When sending the first message (any direction), we look up the 'best' certificate for each user"
My inititor sevice is owned by dbo, i have created certificates only for named users not dbo, how would this work?
2. I am going to try settin gup this again, but at the central service i will create a seprate user for each remote service, authorize the remote certificate for this user and use this user in the remote service binding for that remote service, is this correct or am i still doing somehting wrong?
3. How does all of this relate to the endpoint security, i ahve the same scenario, 1 pricipal id with all remote certificates authorized for it for the endpoint? I have no idea how i would have to setup different user for each remote servcie as far as the endpoint goes as there is no remote service binding to dictate which user to use ?
I will keep try and experimenting maybe i will get it right sooner or later.
Thank You
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Aug 3, 2006
Hi There
I have done the following.
2 Servers across the net work Server A and Server B.
I have created private keys at each and copied to public keys across.
I create an endpoint at each with validation by the certificates. I then create appropriate users and logins at each and import the public certificates with authorization to the users who have send permission on the endpoints.
That is transport security sorted and it works.
Now from what i have learnt from examples, to setup dialog security i do the following.
create a private key in each DB :
create certificate Store001DialogPri
with subject = 'Store001DialogPri',
start_date = '07/20/2006'
active for begin_dialog = on;
go
I then copy the public key to each server, create a user only in each DB and import the public keys with authorization on the user. And grant send to the appropriate servcies to the user.
I then create appropriate remote service bindings with this user.
Now this works for me. Everythign seems A OK.
However i am going thorugh the Service Broker "bible", and there are a ton of steps i am not doing but my setup works ???
Steps i am not doing for example is when i create the private keys in the DB i should authorize them to a user i create who is then gratnted CONTROL permission on the SERVICES.
Now i do not do this but everything seems to be working. I thought i finally understood dialogs security but now i am totally confused ?
Is what i am doing correct ? If so why are these all these additinal steps mentioned ? WHat am i missing ?
Thanx
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Apr 25, 2006
I understand that Dialog Security + certificates can be used to encryption individual dialogs. I have several demos working now that do just this.However, I don't fully understand exactly when the messages are encrypted, and if they are ever written to a queue on the initiating service prior to being encrypted. I want to make sure that admins can't simply query the transmission queues to get clear text messages, because I have strict requirements that I encrypt all personal data that is stored anywhere in a database.
BOL is a little unclear on this topic. The relevant doc reads:For a dialog that uses security, Service Broker encrypts all
messages sent outside a SQL Server instance. Messages that remain within a SQL
Server instance are never encrypted. In dialog security, only the database that
hosts the initiating service and the database that hosts the target service need
to have access to the certificates used for security. That is, an instance that
performs message forwarding is not required to have the capability to decrypt
the messages that the instance forwards.Does this imply that message destined for an external service aren't encrypted until they leave the instance? Or does Service Broker figure out that the message is destined for a remote service and therefore applies encryption to the message_body prior to the message hitting the transmission queue on the initiating service?Many thanks, Kevin
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Apr 8, 2006
www.codeplex.com/slm
Setting up Service Broker routes, endpoints and security is just too hard. One has to run pages and pages of Transact-SQL code just to get the €˜Hello, world€™ example work between two separate SQL Instances and the chances of making a mistake are overwhelming.
Well, not anymore! I€™ve just uploaded into the Service Broker team code gallery a new GUI tool for doing just that: easily configure two services to be able to have conversations. The tool uses the €˜Service Listing€™ concept. A Service Listing is like an identity card for a service. It is an XML document that contains all the necessary information needed to establish a conversation with that service. When two parties need to establish a conversation, they can exchange the Service Listings of the two services and the tool will create the entire infrastructure needed to establish the conversation. Optionally it can also create the message types and contracts supported by a target service in the initiator service database....
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Feb 7, 2007
Hi Remus,
I just started looking into SB about a week ago, so my question is likely to be pretty lame. However, that's not going to stop me from asking it :-)
We're trying to do something similar to what you're describing here. How do you "reset" a dialog timer? Why would you need to deal with resetting timers (or with timers at all for that matter) in the event of a success? Couldn't you rewrite the logic to be as follows?
begin transaction
receive message
if message is web request
save state of request (http address, caller etc)
else if message is retry timer message
load state of request
endif
commit
do the web request (no transaction open)
if success
begin transaction
send back response
end conversation
commit
else
set a retry timer on the dialog (say 1 minute) using BEGIN DIALOG TIMER
endif
Also, when you set the retry timer you have to associate it with the saved request state, right? Otherwise, how will the service know which request to load on receipt of the timer message?
TIA.
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Sep 26, 2007
I am doing some research to see if the Service Broker technology would help my company with our Enterprise application. Here is our scenario: We have a 3 tier system. The first tier needs to contact the second tier asynchronously. Hence, using queues is a good option. However, the process that needs to happen on the second tier is mostly process intensive with little database updates. Is it still worth our time to use Service Broker?
I like the concept of Activation that Service Broker provides. But, from what I am reading most of the documentation describes activation as a way to call another stored proc. I definitely dont' want to do any process intensive work on the SQL server. So here comes my question...
How would I use a windows service to listen to the activation event from the Service Broker. I could have multiple windows services watching the same queue (scalable). Would I have to handle collisions myself? If so, I think I would rather keep it simple, and just use a simple table as my queue.
Thanks for your comments in advance...
Vijay.
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Apr 5, 2008
Hi to all, I want to study Sql server Service broker, have some questions1. What is the use of service broker ?2. Where this will use ? (With example)3. How to enable Service broker? Because i have sql server 2005 version but no folder like service broker.
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Aug 29, 2006
Im having a hard time understanding everything required to create a simple Service Broker example. Can someone please assist? Source code would be ideal, but if not "do this, do that" would even be helpful.
Thanks.
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Sep 8, 2006
I am trying to implement service broker. I send a message from my application code to the database to execute a specific stored procedure. How do i return the result set obtained by the execution of the stored procedure to the application.
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May 16, 2006
My service broker seems to be broken... The database was restored from another crashed server but i have tried the
ALTER AUTHORIZATION ON DATABASE::[SPYDERONTHEWEB] TO [SA];
The error i'm getting is
Service Broker needs to access the master key in the database 'SpyderOnTheWeb'. Error code 25. The master key has to exist and th service master key encryption is required.
Error: 28054, Severity 11, State: 1.
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Sep 26, 2006
Hi
It will be great to have an update on MS plans to solve the problem of using
Service Broker for remote users who sit behind the NAT.
Any news will be appreciated.
Leonid.
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Sep 11, 2006
Hello , I am trying to Implement distribution of the Stock Quotes over the LAN(only within the Network) and showing the live changing stock Quotes on the front end (in datagrid) installed at each clients desktop.I am receiving the Stock prices over the TCP / IP from the Stock Exchange. I am recieving atleast 10-15 messages per second over the TCP / IP from the Stock Exchange. Now i need to distribute this feed to Each connected client.
I tried doing it from TCP / IP , but in vein. Can we install the SQL 2005 Database Client Version on every client and use Service broker instaed of Live TCP / IP connections programmatically?
Ideally Can i dump the meesages from Stock Exchange in to each connected client's database locally and each front end application will keep a record of all the incomming messages.i.e Front end have a notification event , it will referesh the Datagrid in Front end accordingly...
ALL my front end application are made in dot net
Pls suggest if this above workflow will help me
Yugant
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Jan 8, 2008
Hi,
Is it possible to develop Service Broker in .Net 1.1 (VS 2003)? Currently I have a project developed in .Net 1.1 and I want to add a new method utilize the message queue concept (instead of using MSMQ, using Service Broker SQL 2005), although my DB is SQL server 2005.
Thanks,
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Jul 3, 2007
Hi all
if any one have any white paper or artical cover this issue kindly i need it
thanks , regards
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May 16, 2007
Hi,
I am looking at the Service Broker as a way to notify multiple clients that there has been data changed on a table in the shared database. These clients may or may not be online. When there is a change, the notification should fire off a query to refresh the clients local cache. Is this a situation where Service Broker would help me? Can multiple clients recieve the notification at different times ( some recieve while online, some recieve when they come back online)? Any help on this would be appreciated. It seems from what I read that the messages are pulled off the queue when a notification has taken place. Is this correct? If so, can I set it to behave differently?
Thanks,
-paul
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