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According to Figure 72, the activation involves the client process, the RPCSS service and the DcomLaunch service on the server side, and the server process In the case of local activation, the communication from the client-side RPCSS and serverside RPCSS is a shortcut We start by identifying the processes involved in the activation path and create a mental diagram of the relationship between them The tlistexe tool, installed with the Debugging Tools for Windows, is excellent for this In Listing 724, we use tlistexe to find the process identifiers of DcomLaunch and RpcSs services on the server side Listing 724
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c:\>tlist s 0 System Process 4 System 300 smssexe 432 csrssexe 464 winlogonexe 548 servicesexe 560 lsassexe 716 svchostexe 768 svchostexe
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Title: Svcs: Svcs: Svcs: Svcs: Eventlog,PlugPlay PolicyAgent,ProtectedStorage,SamSs DcomLaunch,TermService RpcSs
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After identifying the process used by the execution path, the quickest way to debug is to assume that the activation call reaches the last process in the call chain, attach a user mode debugger to the latest process in the path and stop the process execution, then execute again the failing client call If the client does not hang, the call path does not reach the process currently stopped in the debugger, and we can detach the debugger by entering the qd command We repeat the process higher in the call path until the client hangs in the activation call At that point, we can use this process to identify what credentials the client uses, what other DCOM settings are at call time, and so on The better we understand the client environment at call time, the easier it is to create a possible scenario for each failure, demonstrate its validity, and move forward This section describes all the places in the activation path useful to evaluate the activation progress and explains how to interpret the information available on those points The activation path can be exercised using option zero of the 08cliexe sample Remote clients are facing the first security gate when the system authenticates to the remote system The progress can be monitored by examining the SSPI return codes, as described in the Remote Authentication and Security Support Provider Interface section The SSPI authentication request is handled by the RPCSS service code
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After the remote authentication succeeds (local clients are already authenticated by the operating system), the activation code uses the impersonation token representing the client to perform various checks, using the advapi32!AccessCheck in RPCSS service running on the server As part of the activation, the RPCSS service performs multiple checks, each having its role Listing 725 shows the first check that validates if the caller has the right to access the server using the DCOM protocol We attach a debugger to RPCSS service and set a breakpoint on the ADVAPI32!AccessCheck, as in the following listing: Listing 725
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0:007> bp ADVAPI32!AccessCheck;g Breakpoint 0 hit eax=007dfce4 ebx=00000000 ecx=007dfcf8 edx=007dfd08 esi=00000001 edi=00000000 eip=77dd7c11 esp=007dfcb8 ebp=007dfd10 iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000206 ADVAPI32!AccessCheck: 77dd7c11 8bff mov edi,edi 0:007> k ChildEBP RetAddr 007dfcb4 76a822a6 ADVAPI32!AccessCheck 007dfd10 76a824f6 rpcss!CheckForAccess+0x81 007dfd5c 77e7a2c1 rpcss!LocalInterfaceOnlySecCallback+0xb9 007dfdb4 77e7c767 RPCRT4!RPC_INTERFACE::CheckSecurityIfNecessary+0x6f 007dfdcc 77e7bcc9 RPCRT4!LRPC_SBINDING::CheckSecurity+0x4f 007dfdfc 77e7bb6a RPCRT4!LRPC_SCALL::DealWithRequestMessage+0x194 007dfe20 77e76784 RPCRT4!LRPC_ADDRESS::DealWithLRPCRequest+0x16d 007dff80 77e76c22 RPCRT4!LRPC_ADDRESS::ReceiveLotsaCalls+0x28f 007dff88 77e76a3b RPCRT4!RecvLotsaCallsWrapper+0xd 007dffa8 77e76c0a RPCRT4!BaseCachedThreadRoutine+0x79 007dffb4 7c80b50b RPCRT4!ThreadStartRoutine+0x1a 007dffec 00000000 kernel32!BaseThreadStart+0x37 0:007> * !sd extension fails; we grab the ACL directly from the SD 0:007>!acl poi(@esp+4)+poi(poi(@esp+4)+10) ACL is: ACL is: ->AclRevision: 0x2 ACL is: ->Sbz1 : 0x0 ACL is: ->AclSize : 0x30 ACL is: ->AceCount : 0x2 ACL is: ->Sbz2 : 0x0 ACL is: ->Ace[0]: ->AceType: ACCESS_ALLOWED_ACE_TYPE ACL is: ->Ace[0]: ->AceFlags: 0x0 ACL is: ->Ace[0]: ->AceSize: 0x14
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