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Listing 731
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lkd> * Finding the token used by the process executing wmiprvseexe lkd> !process 0 1 wmiprvseexe PROCESS 81a71da0 SessionId: 0 Cid: 03f4 Peb: 7ffd8000 ParentCid: 0320 DirBase: 0a848000 ObjectTable: e21f59c8 HandleCount: 159 Image: wmiprvseexe VadRoot 8203e5b0 Vads 109 Clone 0 Private 377 Modified 89 Locked 0 DeviceMap e1881148 e18b2a68 Token lkd> * Displaying the token information lkd> !token e18b2a68 -n _TOKEN e18b2a68 TS Session ID: 0 User: S-1-5-20 (Well Known Group: NT AUTHORITY\NETWORK SERVICE) Groups: 00 S-1-5-20 (Well Known Group: NT AUTHORITY\NETWORK SERVICE) Attributes - Mandatory Default Enabled Impersonation Level: Impersonation TokenType: Primary Source: Advapi TokenFlags: 0x81 ( Token in use ) Token ID: 34e00f ParentToken ID: 0 Modified ID: (0, 34de7a) RestrictedSidCount: 0 RestrictedSids: 00000000
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Because the debugger always has full access to the debugger target process, the only reason for the access failure when opening the primary token can be the primary token security descriptor Listing 732 shows the security descriptor protecting the token obtained from the previous listing Listing 732
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lkd> !sd poi(e18b2a68-4) & FFFFFFF8 ->Revision: 0x1 ->Sbz1 : 0x0 ->Control : 0x8004 SE_DACL_PRESENT SE_SELF_RELATIVE ->Owner : S-1-5-20 ->Group : S-1-5-20 ->Dacl : ->Dacl : ->AclRevision: 0x2
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->Dacl ->Dacl ->Dacl ->Dacl ->Dacl ->Dacl ->Dacl ->Dacl ->Dacl ->Dacl ->Dacl ->Dacl ->Dacl ->Dacl ->Sacl
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->Sbz1 : 0x0 ->AclSize : 0x30 ->AceCount : 0x2 ->Sbz2 : 0x0 ->Ace[0]: ->AceType: ACCESS_ALLOWED_ACE_TYPE ->Ace[0]: ->AceFlags: 0x0 ->Ace[0]: ->AceSize: 0x14 ->Ace[0]: ->Mask : 0x000f01ff ->Ace[0]: ->SID: S-1-5-18 ->Ace[1]: ->Ace[1]: ->Ace[1]: ->Ace[1]: ->Ace[1]: is NULL ->AceType: ACCESS_ALLOWED_ACE_TYPE ->AceFlags: 0x0 ->AceSize: 0x14 ->Mask : 0x000f01ff ->SID: S-1-5-20
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7 SECURITY
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The primary token s security descriptor does not allow system administrators to get a handle to it Because the debugger runs under an administrator principal, different from LocalSystem or NetworkService, the primary token is not accessible to the !token extension command The failure of opening the impersonating token is caused by a similar incompatibility between the thread object and the administrator account running the debugger
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The last debugging example is performed on a previously healthy system running Windows XP SP2 that behaves strangely after the reboot requested by an application installation The system fails to activate any DCOM server, affecting most administration MMC snap-ins Even after turning on all DCOM tracing settings, described previously in the DCOM Call Access Checks section, no clear message can point to the problem root cause We begin debugging by using the model discussed previously of stopping each process that is part of the activation path in the debugger, while retrying the client activation The first process from the bottom of the call path for which the client hangs is the process hosting the DcomLaunch service Although this service is stopped in the debugger, no processes that are part of the activation path namely the client making the activation call, the process hosting the RPCSS service, and the process hosting DcomLaunch changes and can be investigated
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We expect the client process to have at least one thread with the ole32!CocreateInstanceEx API call on the stack at this time Therefore, we attach a user mode debugger to the client process and list the stack for all threads The client activation stack available in Listing 733 shows the thread that waits for a reply to a local RPC call, as indicated by the presence of the rpcrt4!LRPC_CALL on the stack The wait and the visible client hang are caused by the debugger breaks in the process hosting the DcomLaunch service Listing 733
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0:001> ~0 k ChildEBP RetAddr 0013de30 7c90e3ed 0013de34 77e7c968 0013de80 77e7a716 0013e4f0 77545fc8 0013e73c 7752f4f5 0013e77c 7752f33a 0013ef2c 77526000 0013ef54 77525fcf 0013ef78 74ef18c1
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ntdll!KiFastSystemCallRet ntdll!NtRequestWaitReplyPort+0xc RPCRT4!LRPC_CCALL::SendReceive+0x228 ole32!CRpcResolver::CreateInstance+0x13d ole32!CClientContextActivator::CreateInstance+0xfa ole32!ActivationPropertiesIn::DelegateCreateInstance+0xf7 ole32!ICoCreateInstanceEx+0x3c9 ole32!CComActivator::DoCreateInstance+0x28 ole32!CoCreateInstanceEx+0x1e
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Because the error returned to the client has always been an access denied error, the next logical step is identifying the principal that the caller threads run under As before, we use the !token extension command to obtain the current thread impersonating an access token Because the extension command acts over the current thread, the first step sets the thread zero as the active thread Listing 734
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0:001> ~0s 0:000> !token -n Thread is not impersonating Using process token TS Session ID: 0 User: S-1-5-21-1060284298-2111687655-1957994488-1003 (User: XP-SP2-BACK\TestAdmin) Groups: 00 S-1-5-21-1060284298-2111687655-1957994488-513 (Group: XP-SP2-BACK\None) Attributes - Mandatory Default Enabled 01 S-1-1-0 (Well Known Group: localhost\Everyone) Attributes - Mandatory Default Enabled