Successful DCOM Activation Trace in Software

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Successful DCOM Activation Trace
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This section analyzes the packets exchanged between two systems configured in a workgroup while the client invokes a DCOM method implemented by the server, using the chapter sample code Figure 85 shows Ethereal traffic captured in this case, after removing the additional traffic on the network hosting the systems As in the previous section, the server has the 1921680104 address, and the client uses the 1921680105 address The network traffic illustrating this has been captured in the 08capture1cap file
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Figure 85 Packets exchanged during a DCOM activation followed by a long-running call So what are all the packets exchanged in this very simple application The packets roles are interpreted as follows:
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Frame 1: The client sends a Bind message to bind the ISystemActivator interface, identified by the decoder using the {000001A0-0000-0000-C000000000000046} GUID This packet also contains the security negotiation message This message is sent over an existing TPC/IP connection to the DCOM SCM port established before starting the capture operation Frame 2: The server acknowledges the Bind with a Bind_ack packet This packet also contains the NTLM challenge message because this is the only common authentication mechanism accepted by both the server and the client Frame 3: The client answers to the challenge with an Alter_context message, using information derived from the user TestAdmin credentials Frame 4: The server verifies the caller identity and confirms it with an Alter_context_resp message The interface is ready to be used
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Frame 5: The client invokes RemoteCreateInstance, passing the server CLSID as a parameter (the current decoder does not parse this information), in this case {31810948-8D81-4E55-BD16-0C27F5629392} Frame 8: The server returns an interface pointer of the requested object, along with the data required to connect to that object instance (information known as the object exporter identifier, or OXID) The OXID returned contains the RPC binding string for the object exporter Frames 9, 10, 11: The client connects to the object exporter managing the interface returned by the activation process Frames 12, 13, 14: The client binds to the ICalculator interface and authenticates the user, similar to the process described in frames 2 4 Frame 15: The client invokes IClaculator::SlowSum, identifiable by the interface IID and the method number or opnum Frames 41-46: Every two minutes, there is an IOXIDResolver::ComlexPing call from the client to the server used to inform the server that the client is still up and running Frame 233: The server returns the results from the operation initiated in frame 15 Frames 234-235: The client obtains an IRemUnknown2 interface using the current connection to the server object Frames 234-235: The client executes the IRemUnknown2::RemRelease on the interface obtained in frame 235
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Failing DCOM Activation Trace
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Because we use network monitor tools mostly to troubleshoot problems, it is important to know how effective this method is for discovering problems in network communication What kind of problems can be discovered in this way This section uses a file capturing a remote DCOM activation failure, which is a fairly common error The traffic captured in the failure case shows the deviation from the communication flow characteristic to the successful activation The differences can lead toward the most likely problem in no time Figure 86 shows the content of the 08capture02cap file that contains the whole activity leading to the failure
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Figure 86 Packets captured during a failed DCOM activation The first few packets play similar roles as in the previous section, whereas the last activation packet is completely different The packet s interpretation is as follows:
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Frame 1: The client sends a bind request to theISystemActivator interface and also contains the security negotiation message as described Frame 2: The server acknowledges the bind with a Bind_ack packet Frame 3: The client answers to the challenge with an Alter_context message, using information associated with the username TestAdmin, such as the password Frame 4: The server verifies the caller identity with an Alter_context_resp message The interface is ready to be used Frame 5: The client invokes RemoteCreateInstance Frame 6: The server fails the activation, and the result is sent to the client as a fault frame that contains the access denied error code 0x00000005 nicely extracted by the tool from the error frame
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