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sys: security: turns out that the AccessToken is not needed

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This commit is contained in:
Bill Zissimopoulos
2016-12-10 17:45:36 -08:00
parent 418c454a4a
commit 4b024ebe74
10 changed files with 5 additions and 103 deletions
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1
src/sys/driver.c
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@ -120,7 +120,6 @@ NTSTATUS DriverEntry(
FspIopCompleteFunction[IRP_MJ_LOCK_CONTROL] = FspFsvolLockControlComplete;
FspIopCompleteFunction[IRP_MJ_CLEANUP] = FspFsvolCleanupComplete;
FspIopCompleteFunction[IRP_MJ_QUERY_SECURITY] = FspFsvolQuerySecurityComplete;
FspIopPrepareFunction[IRP_MJ_SET_SECURITY] = FspFsvolSetSecurityPrepare;
FspIopCompleteFunction[IRP_MJ_SET_SECURITY] = FspFsvolSetSecurityComplete;
/* setup fast I/O and resource acquisition */

1
src/sys/driver.h
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@ -321,7 +321,6 @@ FSP_IOCMPL_DISPATCH FspFsvolReadComplete;
FSP_IOCMPL_DISPATCH FspFsvolSetEaComplete;
FSP_IOPREP_DISPATCH FspFsvolSetInformationPrepare;
FSP_IOCMPL_DISPATCH FspFsvolSetInformationComplete;
FSP_IOPREP_DISPATCH FspFsvolSetSecurityPrepare;
FSP_IOCMPL_DISPATCH FspFsvolSetSecurityComplete;
FSP_IOCMPL_DISPATCH FspFsvolSetVolumeInformationComplete;
FSP_IOCMPL_DISPATCH FspFsvolShutdownComplete;

77
src/sys/security.c
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@ -23,7 +23,6 @@ FSP_IOCMPL_DISPATCH FspFsvolQuerySecurityComplete;
static FSP_IOP_REQUEST_FINI FspFsvolQuerySecurityRequestFini;
static NTSTATUS FspFsvolSetSecurity(
PDEVICE_OBJECT DeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp);
FSP_IOPREP_DISPATCH FspFsvolSetSecurityPrepare;
FSP_IOCMPL_DISPATCH FspFsvolSetSecurityComplete;
static FSP_IOP_REQUEST_FINI FspFsvolSetSecurityRequestFini;
FSP_DRIVER_DISPATCH FspQuerySecurity;
@ -34,7 +33,6 @@ FSP_DRIVER_DISPATCH FspSetSecurity;
#pragma alloc_text(PAGE, FspFsvolQuerySecurityComplete)
#pragma alloc_text(PAGE, FspFsvolQuerySecurityRequestFini)
#pragma alloc_text(PAGE, FspFsvolSetSecurity)
#pragma alloc_text(PAGE, FspFsvolSetSecurityPrepare)
#pragma alloc_text(PAGE, FspFsvolSetSecurityComplete)
#pragma alloc_text(PAGE, FspFsvolSetSecurityRequestFini)
#pragma alloc_text(PAGE, FspQuerySecurity)
@ -49,8 +47,6 @@ enum
/* SetSecurity */
//RequestFileNode = 0,
RequestAccessToken = 2,
RequestProcess = 3,
};
static NTSTATUS FspFsvolQuerySecurity(
@ -244,53 +240,6 @@ static NTSTATUS FspFsvolSetSecurity(
return FSP_STATUS_IOQ_POST;
}
NTSTATUS FspFsvolSetSecurityPrepare(
PIRP Irp, FSP_FSCTL_TRANSACT_REQ *Request)
{
PAGED_CODE();
NTSTATUS Result;
SECURITY_SUBJECT_CONTEXT SecuritySubjectContext;
SECURITY_QUALITY_OF_SERVICE SecurityQualityOfService;
SECURITY_CLIENT_CONTEXT SecurityClientContext;
HANDLE UserModeAccessToken;
PEPROCESS Process;
/* duplicate the subject context access token into an impersonation token */
SecurityQualityOfService.Length = sizeof SecurityQualityOfService;
SecurityQualityOfService.ImpersonationLevel = SecurityIdentification;
SecurityQualityOfService.ContextTrackingMode = SECURITY_STATIC_TRACKING;
SecurityQualityOfService.EffectiveOnly = FALSE;
SeCaptureSubjectContext(&SecuritySubjectContext);
SeLockSubjectContext(&SecuritySubjectContext);
Result = SeCreateClientSecurityFromSubjectContext(&SecuritySubjectContext,
&SecurityQualityOfService, FALSE, &SecurityClientContext);
SeUnlockSubjectContext(&SecuritySubjectContext);
SeReleaseSubjectContext(&SecuritySubjectContext);
if (!NT_SUCCESS(Result))
return Result;
ASSERT(TokenImpersonation == SeTokenType(SecurityClientContext.ClientToken));
/* get a user-mode handle to the impersonation token */
Result = ObOpenObjectByPointer(SecurityClientContext.ClientToken,
0, 0, TOKEN_QUERY, *SeTokenObjectType, UserMode, &UserModeAccessToken);
SeDeleteClientSecurity(&SecurityClientContext);
if (!NT_SUCCESS(Result))
return Result;
/* get a pointer to the current process so that we can close the impersonation token later */
Process = PsGetCurrentProcess();
ObReferenceObject(Process);
/* send the user-mode handle to the user-mode file system */
FspIopRequestContext(Request, RequestAccessToken) = UserModeAccessToken;
FspIopRequestContext(Request, RequestProcess) = Process;
Request->Req.SetSecurity.AccessToken = (UINT_PTR)UserModeAccessToken;
return STATUS_SUCCESS;
}
NTSTATUS FspFsvolSetSecurityComplete(
PIRP Irp, const FSP_FSCTL_TRANSACT_RSP *Response)
{
@ -339,35 +288,9 @@ static VOID FspFsvolSetSecurityRequestFini(FSP_FSCTL_TRANSACT_REQ *Request, PVOI
PAGED_CODE();
FSP_FILE_NODE *FileNode = Context[RequestFileNode];
HANDLE AccessToken = Context[RequestAccessToken];
PEPROCESS Process = Context[RequestProcess];
if (0 != FileNode)
FspFileNodeReleaseOwner(FileNode, Full, Request);
if (0 != AccessToken)
{
KAPC_STATE ApcState;
BOOLEAN Attach;
ASSERT(0 != Process);
Attach = Process != PsGetCurrentProcess();
if (Attach)
KeStackAttachProcess(Process, &ApcState);
#if DBG
NTSTATUS Result0;
Result0 = ObCloseHandle(AccessToken, UserMode);
if (!NT_SUCCESS(Result0))
DEBUGLOG("ObCloseHandle() = %s", NtStatusSym(Result0));
#else
ObCloseHandle(AccessToken, UserMode);
#endif
if (Attach)
KeUnstackDetachProcess(&ApcState);
ObDereferenceObject(Process);
}
}
NTSTATUS FspQuerySecurity(