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Not all objects accessible at any given time in the kernel memory have a security descriptor that can be accessed using the method described in Listing 710 Persistent kernel objects, such as files or registry keys, keep the security descriptor in a secondary store and manage the security access through their proprietary mechanism If we are looking at a registry key object, we can see that it has the security descriptor NULL, which does not allow us to statically examine the security descriptor To demonstrate this case, we used option 4 in the sample, which opens a few registry keys
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kd> k4 ChildEBP RetAddr 0006ff00 01001f33 07sample!Sample4Get+0x45 0006ff18 01001e48 07sample!AppInfo::Loop+0xb3 0006ff7c 01002aa6 07sample!wmain+0xa8 0006ffc0 7c816fd7 07sample!__wmainCRTStartup+0x102 kd> dv *key softwareKey = 0x000007f4 bookKey = 0x77c2ed0e kd> !handle 7f4 processor number 0, process ffbbc818 PROCESS ffbbc818 SessionId: 0 Cid: 01c4 Peb: 7ffde000 DirBase: 0232e000 ObjectTable: e1112e10 HandleCount: Image: 07sampleexe
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Handle table at e122f000 with 9 Entries in use 07f4: Object: e18cce60 GrantedAccess: 00020019 Entry: e122ffe8 Object: e18cce60 Type: (812e4e70) Key ObjectHeader: e18cce48 HandleCount: 1 PointerCount: 1 Directory Object: 00000000 Name: \REGISTRY\MACHINE\SOFTWARE kd> dt _OBJECT_HEADER e18cce48 +0x000 PointerCount : 1 +0x004 HandleCount : 1 +0x004 NextToFree : 0x00000001 +0x008 Type : 0x812e4e70 _OBJECT_TYPE +0x00c NameInfoOffset : 0 +0x00d HandleInfoOffset : 0 +0x00e QuotaInfoOffset : 0 +0x00f Flags : 0 +0x010 ObjectCreateInfo : 0x812ca8e8 _OBJECT_CREATE_INFORMATION +0x010 QuotaBlockCharged : 0x812ca8e8 +0x014 SecurityDescriptor : (null) +0x018 Body : _QUAD
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When the security descriptor is not easily available for inspection, its value can be validated at the moment the object broker performs the access check All other user mode components exposing objects not managed by the kernel (such as Service Control Manager) also use their own mechanism to manage their security descriptors
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To ensure consistent access rules across Windows components, the kernel implements a set of security APIs with the signature published in the ntddkh header file The central function is the kernel function SeAccessCheck used by the user mode components through the advapi32!AccessCheck API SeAccessCheck takes as parameters the security descriptor, the access token (in the SubjectSecurityContext parameter), and the requested access
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BOOLEAN SeAccessCheck ( IN PSECURITY_DESCRIPTOR SecurityDescriptor, IN PSECURITY_SUBJECT_CONTEXT SubjectSecurityContext, IN BOOLEAN SubjectContextLocked, IN ACCESS_MASK DesiredAccess, IN ACCESS_MASK PreviouslyGrantedAccess, OUT PPRIVILEGE_SET *Privileges OPTIONAL, IN PGENERIC_MAPPING GenericMapping, IN KPROCESSOR_MODE AccessMode, OUT PACCESS_MASK GrantedAccess, OUT PNTSTATUS AccessStatus);
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The access granted by user mode code can be easily identified in the debugger by inspecting the return value and the output parameters filled by the advapi32!AccessCheck API The access granted by kernel mode code can be identified by inspecting the return from the SeAccessCheck kernel API To identify access problems caused by improper security settings on various files and registry keys, we can also use tracing tools such as Process Monitor, tools provided free of charge by Microsoft
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Most applications use the primary access token for all operations Client-server applications often use the impersonation model, in which the server executes most, if not all, of the client requests in the context of an impersonation access token obtained from that client The impersonation access token is propagated by specific functionality exposed by the interprocess communication infrastructure used to support the client-server conversation Impersonation functions such as ntdll!NtImpersonateClientOfPort, exposed by the LPC communication mechanism; rpcrt4!RpcImpersonateClient, implemented by
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the RPC infrastructure; and advapi32!ImpersonateNamedPipeClient, implemented by the file system redirector impersonate the caller thread with the client access token used to invoke the server using the respective facilities In some cases, user credentials are available on the server side, especially in the case of Web-based applications, and the server creates an access token by invoking advapi32!LogonUser(Ex)W directly Each protocol uses its proprietary mechanism to propagate the identity of the client When the client and the server reside on different systems, the Security Server Provider Interface (SSPI) can be used to propagate the security information for client-server applications rpcrt4!RpcImpersonateClient is a special proxy function that delegates the impersonation request to the underlying communication mechanism used by RPC for that connection When RPC is used to communicate between two processes residing in the same system, the call uses LPC functions to achieve the result When the client runs on a different system from the server, RPC uses either the file system redirector functionality, in the case of remote calls using transport security, or SSPI functionality in the vast majority of the cases
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