955 lines
21 KiB
C++
955 lines
21 KiB
C++
//+-----------------------------------------------------------------------
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//
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// Microsoft Windows
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//
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// Copyright (c) Microsoft Corporation 1992 - 1997
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//
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// File: sidcache.cxx
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//
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// Contents: routines to cache username->sid translations to speed up
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// logon performance
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//
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//
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// History: 27-May-1998 MikeSw Created
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//
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//------------------------------------------------------------------------
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#include <kerb.hxx>
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#include <kerbp.h>
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#define KERB_LOGON_SID_CACHE_KEY L"SidCache"
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#define KERB_LOGON_SID_CACHE_ENTRIES L"CacheEntries"
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#define KERB_LOGON_SID_CACHE_ENTRY_NAME L"Entry%d"
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#define KERB_MACHINE_SID_CACHE_NAME L"MachineSid"
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#define KERB_LOGON_SID_CACHE_MAX_ENTRIES 1000
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#define KERB_LOGON_SID_CACHE_DEFAULT_ENTRIES 10
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#define KERB_LOGON_SID_CACHE_ENTRY_NAME_SIZE (sizeof(L"Entry") * 4*sizeof(WCHAR))
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#define KERB_LOGON_SID_CACHE_VERSION 0
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KERBEROS_LIST KerbSidCache;
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HKEY KerbSidCacheKey;
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ULONG KerbSidCacheMaxEntries = KERB_LOGON_SID_CACHE_DEFAULT_ENTRIES;
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ULONG KerbSidCacheEntries;
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#define VALIDATE_POINTER(Ptr,Size,Base,Bound,NewBase,Type) \
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if (((PUCHAR)(Ptr) < (PUCHAR)(Base)) || (((PUCHAR)(Ptr) + (Size)) > (PUCHAR)(Bound))) \
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{ \
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Status = STATUS_INVALID_PARAMETER; \
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goto Cleanup; \
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} \
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else \
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{ \
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(Ptr) = (Type) ((PUCHAR) (Ptr) - (ULONG_PTR) Base + (ULONG_PTR) NewBase); \
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} \
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//+-------------------------------------------------------------------------
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//
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// Function: KerbVerifyUnpackAndLinkSidCacheEntry
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//
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// Synopsis: Unmarshalls the entry & verifies that the pointers all
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// match up within the buffer. If this is the case, it
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// inserts the entry into the list & zeroes out the pointer
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// so the caller won't free it.
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//
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// Effects:
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//
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// Arguments:
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//
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// Requires:
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//
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// Returns:
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//
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// Notes:
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//
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//
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//--------------------------------------------------------------------------
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NTSTATUS
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KerbVerifyUnpackAndLinkSidCacheEntry(
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IN PKERB_SID_CACHE_ENTRY * SidCacheEntry,
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IN ULONG CacheEntrySize
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)
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{
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NTSTATUS Status = STATUS_SUCCESS;
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PKERB_SID_CACHE_ENTRY CacheEntry = *SidCacheEntry;
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PUCHAR Bound;
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//
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// First check the base structure size
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//
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if (CacheEntrySize < sizeof(KERB_SID_CACHE_ENTRY))
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{
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Status = STATUS_INVALID_PARAMETER;
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goto Cleanup;
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}
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//
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// Now check the version
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//
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if (CacheEntry->Version != KERB_LOGON_SID_CACHE_VERSION)
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{
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Status = STATUS_INVALID_PARAMETER;
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goto Cleanup;
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}
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if (CacheEntry->Size != CacheEntrySize)
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{
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Status = STATUS_INVALID_PARAMETER;
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goto Cleanup;
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}
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//
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// Now check all the pointers
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//
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Bound = (PUCHAR) CacheEntry->Base + CacheEntrySize;
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VALIDATE_POINTER(
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CacheEntry->Sid,
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RtlLengthRequiredSid(5), // space for 5 sub authorities
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CacheEntry->Base,
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Bound,
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CacheEntry,
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PSID
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);
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VALIDATE_POINTER(
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CacheEntry->LogonUserName.Buffer,
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CacheEntry->LogonUserName.MaximumLength,
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CacheEntry->Base,
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Bound,
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CacheEntry,
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PWSTR
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);
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VALIDATE_POINTER(
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CacheEntry->LogonDomainName.Buffer,
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CacheEntry->LogonDomainName.MaximumLength,
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CacheEntry->Base,
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Bound,
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CacheEntry,
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PWSTR
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);
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VALIDATE_POINTER(
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CacheEntry->LogonRealm.Buffer,
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CacheEntry->LogonRealm.MaximumLength,
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CacheEntry->Base,
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Bound,
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CacheEntry,
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PWSTR
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);
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KerbInitializeListEntry(
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&CacheEntry->Next
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);
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//
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// This inserts at the head, not the tail
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//
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KerbInsertListEntryTail(
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&CacheEntry->Next,
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&KerbSidCache
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);
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*SidCacheEntry = NULL;
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Cleanup:
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return(Status);
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}
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//+-------------------------------------------------------------------------
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//
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// Function: KerbInitializeLogonSidCache
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//
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// Synopsis: Initializes the list of cached logon sids
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//
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// Effects: Reads data from the registry
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//
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// Arguments:
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//
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// Requires:
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//
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// Returns:
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//
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// Notes:
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//
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//
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//--------------------------------------------------------------------------
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NTSTATUS
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KerbInitializeLogonSidCache(
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VOID
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)
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{
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NTSTATUS Status = STATUS_SUCCESS;
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DWORD RegErr = ERROR_SUCCESS;
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DWORD Disposition = 0;
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PKERB_SID_CACHE_ENTRY NextEntry = NULL;
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ULONG NextEntrySize = 0;
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ULONG ValueType;
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ULONG Index;
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HKEY KerbParamKey = NULL;
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WCHAR EntryName[KERB_LOGON_SID_CACHE_ENTRY_NAME_SIZE];
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//
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// Initialize the list
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//
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Status = KerbInitializeList(&KerbSidCache);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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//
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// Create the sid cache key
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//
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RegErr = RegCreateKeyEx(
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HKEY_LOCAL_MACHINE,
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KERB_PARAMETER_PATH,
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0,
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NULL,
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0,
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KEY_ALL_ACCESS,
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0,
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&KerbParamKey,
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&Disposition
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);
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if (RegErr != ERROR_SUCCESS)
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{
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DebugLog((DEB_ERROR,"Failed to create %ws key: %d\n",KERB_PARAMETER_PATH, RegErr));
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Status = STATUS_UNSUCCESSFUL;
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goto Cleanup;
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}
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RegErr = RegCreateKeyEx(
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KerbParamKey,
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KERB_LOGON_SID_CACHE_KEY,
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0, // reserved
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NULL, // no class
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0, // no options
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KEY_ALL_ACCESS,
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NULL, // no security attributes
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&KerbSidCacheKey,
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&Disposition
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);
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if (RegErr != ERROR_SUCCESS)
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{
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DebugLog((DEB_ERROR,"Failed to create key %ws: %d\n",KERB_LOGON_SID_CACHE_KEY, RegErr));
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Status = STATUS_UNSUCCESSFUL;
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goto Cleanup;
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}
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//
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// Read out the size of the cache
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//
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NextEntrySize = sizeof(ULONG);
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RegErr = RegQueryValueEx(
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KerbSidCacheKey,
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KERB_LOGON_SID_CACHE_ENTRIES,
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NULL, // reserved,
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&ValueType,
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(PUCHAR) &KerbSidCacheMaxEntries,
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&NextEntrySize
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);
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if (RegErr == ERROR_SUCCESS)
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{
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//
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// Make sure the value is within the range & is of the correc type
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//
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if ( (ValueType != REG_DWORD) ||
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(KerbSidCacheMaxEntries > KERB_LOGON_SID_CACHE_MAX_ENTRIES) ||
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(KerbSidCacheMaxEntries == 0) )
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{
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KerbSidCacheMaxEntries = KERB_LOGON_SID_CACHE_DEFAULT_ENTRIES;
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}
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}
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//
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// Now read in all the entries. Loop through up to the max number of
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// entries, reading the entry, and inserting at the tail of the list.
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//
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for (Index = 0; Index < KerbSidCacheMaxEntries ; Index++ )
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{
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swprintf(EntryName,KERB_LOGON_SID_CACHE_ENTRY_NAME, Index);
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//
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// Query the size of the entry
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//
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NextEntrySize = NULL;
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RegErr = RegQueryValueEx(
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KerbSidCacheKey,
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EntryName,
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NULL,
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&ValueType,
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(PUCHAR) NextEntry,
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&NextEntrySize
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);
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if ((RegErr == ERROR_SUCCESS) && (ValueType == REG_BINARY))
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{
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//
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// Allocate space for the entry and re-query to get the real
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// value.
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//
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NextEntry = (PKERB_SID_CACHE_ENTRY) KerbAllocate(NextEntrySize);
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if (NextEntry == NULL)
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{
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Status = STATUS_INSUFFICIENT_RESOURCES;
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goto Cleanup;
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}
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RegErr = RegQueryValueEx(
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KerbSidCacheKey,
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EntryName,
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NULL,
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&ValueType,
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(PUCHAR) NextEntry,
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&NextEntrySize
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);
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if (RegErr != ERROR_SUCCESS)
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{
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DebugLog((DEB_ERROR,"Failed to query for sid cache value: %d\n",
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RegErr ));
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Status = STATUS_UNSUCCESSFUL;
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goto Cleanup;
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}
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//
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// Call a helper routine to unpack,verify, and insert
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Status = KerbVerifyUnpackAndLinkSidCacheEntry(
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&NextEntry,
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NextEntrySize
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);
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//
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// If the entry was invalid, remove it now
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//
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if (!NT_SUCCESS(Status))
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{
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(VOID) RegDeleteValue(
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KerbSidCacheKey,
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EntryName
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);
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Status = STATUS_SUCCESS;
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}
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if (NextEntry != NULL)
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{
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KerbFree(NextEntry);
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NextEntry = NULL;
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}
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NextEntrySize = 0;
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}
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}
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Cleanup:
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if (KerbParamKey != NULL)
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{
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RegCloseKey(KerbParamKey);
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}
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if (NextEntry != NULL)
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{
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KerbFree(NextEntry);
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}
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if (!NT_SUCCESS(Status))
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{
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if (KerbSidCacheKey != NULL)
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{
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RegCloseKey(KerbSidCacheKey);
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KerbSidCacheKey = NULL;
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}
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}
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return(Status);
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}
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//+-------------------------------------------------------------------------
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//
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// Function: KerbScavengeSidCache
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//
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// Synopsis: removes any stale entries from the sid cache to make it fit
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// within bounds
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//
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// Effects:
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//
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// Arguments:
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//
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// Requires:
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//
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// Returns:
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//
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// Notes:
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//
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//
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//--------------------------------------------------------------------------
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VOID
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KerbScavengeSidCache(
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VOID
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)
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{
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PKERB_SID_CACHE_ENTRY CacheEntry;
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while (KerbSidCacheEntries > KerbSidCacheMaxEntries)
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{
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//
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// Pickup the last entry and remove it
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//
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CacheEntry = CONTAINING_RECORD(KerbSidCache.List.Blink, KERB_SID_CACHE_ENTRY, Next.Next);
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KerbReferenceListEntry(
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&KerbSidCache,
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&CacheEntry->Next,
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TRUE
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);
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KerbDereferenceSidCacheEntry(
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CacheEntry
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);
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KerbSidCacheEntries--;
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}
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}
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//+-------------------------------------------------------------------------
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//
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// Function: KerbWriteSidCache
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//
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// Synopsis: Writes the sid cache back to the registry
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//
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// Effects:
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//
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// Arguments:
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//
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// Requires:
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//
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// Returns:
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//
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// Notes:
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//
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//
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//--------------------------------------------------------------------------
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NTSTATUS
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KerbWriteSidCache(
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VOID
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)
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{
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ULONG Index = 0;
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WCHAR EntryName[KERB_LOGON_SID_CACHE_ENTRY_NAME_SIZE];
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PLIST_ENTRY ListEntry;
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PKERB_SID_CACHE_ENTRY CacheEntry;
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for (ListEntry = KerbSidCache.List.Flink ;
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ListEntry != &KerbSidCache.List ;
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ListEntry = ListEntry->Flink )
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{
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CacheEntry = CONTAINING_RECORD(ListEntry, KERB_SID_CACHE_ENTRY, Next.Next);
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swprintf(EntryName,KERB_LOGON_SID_CACHE_ENTRY_NAME, Index++);
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(VOID) RegSetValueEx(
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KerbSidCacheKey,
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EntryName,
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0, // reserved
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REG_BINARY,
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(PUCHAR) CacheEntry,
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CacheEntry->Size
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);
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}
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return(STATUS_SUCCESS);
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}
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//+-------------------------------------------------------------------------
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//
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// Function: KerbPromoteSidCacheEntry
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//
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// Synopsis: Moves a cache entry to the front of the list
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//
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// Effects:
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//
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// Arguments:
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//
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// Requires:
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//
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// Returns:
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//
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// Notes:
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//
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//
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//--------------------------------------------------------------------------
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VOID
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KerbPromoteSidCacheEntry(
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IN PKERB_SID_CACHE_ENTRY CacheEntry
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)
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{
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KerbLockList(&KerbSidCache);
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RemoveEntryList(&CacheEntry->Next.Next);
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InsertHeadList(&KerbSidCache.List, &CacheEntry->Next.Next);
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KerbUnlockList(&KerbSidCache);
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}
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//+-------------------------------------------------------------------------
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//
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// Function: KerbLocateLogonSidCacheEntry
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//
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// Synopsis: Locates a logon sid cache entry by user name and domain name
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//
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// Effects:
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//
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// Arguments:
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//
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// Requires:
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//
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// Returns: returns a referenced cache entry, if available
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//
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// Notes:
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//
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//
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//--------------------------------------------------------------------------
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PKERB_SID_CACHE_ENTRY
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KerbLocateLogonSidCacheEntry(
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IN PUNICODE_STRING LogonUserName,
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IN PUNICODE_STRING LogonDomainName
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)
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{
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PKERB_SID_CACHE_ENTRY CacheEntry = NULL;
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PLIST_ENTRY ListEntry;
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if (!KerbGlobalUseSidCache)
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{
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return(NULL);
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}
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KerbLockList(&KerbSidCache);
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for (ListEntry = KerbSidCache.List.Flink ;
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ListEntry != &KerbSidCache.List ;
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ListEntry = ListEntry->Flink )
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{
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CacheEntry = CONTAINING_RECORD(ListEntry, KERB_SID_CACHE_ENTRY, Next.Next);
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if (RtlEqualUnicodeString(
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&CacheEntry->LogonUserName,
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LogonUserName,
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TRUE
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) &&
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RtlEqualUnicodeString(
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&CacheEntry->LogonDomainName,
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LogonDomainName,
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TRUE
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) )
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{
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//
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// We found it
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//
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KerbReferenceListEntry(
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&KerbSidCache,
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&CacheEntry->Next,
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FALSE // don't remove
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);
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break;
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}
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CacheEntry = NULL;
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}
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KerbUnlockList(&KerbSidCache);
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return(CacheEntry);
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}
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|
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|
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//+-------------------------------------------------------------------------
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//
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// Function: KerbDereferenceSidCacheEntry
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//
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// Synopsis: Dereferences the entry, possibly freeing it
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//
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// Effects:
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//
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// Arguments:
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//
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// Requires:
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//
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// Returns:
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//
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// Notes:
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//
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//
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//--------------------------------------------------------------------------
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VOID
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KerbDereferenceSidCacheEntry(
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IN PKERB_SID_CACHE_ENTRY CacheEntry
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)
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{
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KerbLockList(&KerbSidCache);
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if (KerbDereferenceListEntry(
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&CacheEntry->Next,
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&KerbSidCache
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))
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{
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KerbFree(CacheEntry);
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}
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KerbUnlockList(&KerbSidCache);
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}
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|
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//+-------------------------------------------------------------------------
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//
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// Function: KerbCacheLogonSid
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//
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// Synopsis: Caches a username/domainname & Sid combination for logon
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//
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// Effects: caches the user name/domainname/sid in the registry
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//
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// Arguments: LogonUserName - user name supplied to LogonUser
|
|
// LogonDomainName - domain name supplied to LogonUser
|
|
// LogonRealm - Realm actually containing the account
|
|
// UserSid - Sid of user who just logged on
|
|
//
|
|
// Requires:
|
|
//
|
|
// Returns: none - this is just a cache
|
|
//
|
|
// Notes:
|
|
//
|
|
//
|
|
//--------------------------------------------------------------------------
|
|
|
|
VOID
|
|
KerbCacheLogonSid(
|
|
IN PUNICODE_STRING LogonUserName,
|
|
IN PUNICODE_STRING LogonDomainName,
|
|
IN PUNICODE_STRING LogonRealm,
|
|
IN PSID UserSid
|
|
)
|
|
{
|
|
NTSTATUS Status = STATUS_SUCCESS;
|
|
PKERB_SID_CACHE_ENTRY CacheEntry;
|
|
ULONG CacheEntrySize = 0;
|
|
PUCHAR Where;
|
|
|
|
if (!KerbGlobalUseSidCache)
|
|
{
|
|
return;
|
|
}
|
|
|
|
CacheEntry = KerbLocateLogonSidCacheEntry(
|
|
LogonUserName,
|
|
LogonDomainName
|
|
);
|
|
|
|
//
|
|
// If we found the entry & it is the same as this one, move it up in
|
|
// the list
|
|
//
|
|
|
|
|
|
if (CacheEntry != NULL)
|
|
{
|
|
if (RtlEqualUnicodeString(
|
|
&CacheEntry->LogonRealm,
|
|
LogonRealm,
|
|
TRUE
|
|
) &&
|
|
RtlEqualSid(
|
|
CacheEntry->Sid,
|
|
UserSid
|
|
) )
|
|
|
|
{
|
|
KerbPromoteSidCacheEntry(
|
|
CacheEntry
|
|
);
|
|
goto Cleanup;
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// Remove it from the list
|
|
//
|
|
|
|
KerbLockList(&KerbSidCache);
|
|
KerbReferenceListEntry(
|
|
&KerbSidCache,
|
|
&CacheEntry->Next,
|
|
TRUE // remove
|
|
);
|
|
|
|
KerbDereferenceSidCacheEntry(
|
|
CacheEntry
|
|
);
|
|
KerbDereferenceSidCacheEntry(
|
|
CacheEntry
|
|
);
|
|
KerbUnlockList(&KerbSidCache);
|
|
CacheEntry = NULL;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Now build a new entry
|
|
//
|
|
|
|
CacheEntrySize = sizeof(KERB_SID_CACHE_ENTRY) +
|
|
RtlLengthSid(UserSid) +
|
|
LogonUserName->Length + sizeof(WCHAR) +
|
|
LogonDomainName->Length + sizeof(WCHAR) +
|
|
LogonRealm->Length + sizeof(WCHAR);
|
|
|
|
CacheEntry = (PKERB_SID_CACHE_ENTRY) KerbAllocate(CacheEntrySize);
|
|
if (CacheEntry == NULL)
|
|
{
|
|
Status = STATUS_INSUFFICIENT_RESOURCES;
|
|
goto Cleanup;
|
|
}
|
|
|
|
//
|
|
// Fill in all the fixed fields.
|
|
//
|
|
|
|
KerbInitializeListEntry(
|
|
&CacheEntry->Next
|
|
);
|
|
CacheEntry->Base = (ULONG_PTR) CacheEntry;
|
|
CacheEntry->Version = KERB_LOGON_SID_CACHE_VERSION;
|
|
CacheEntry->Size = CacheEntrySize;
|
|
Where = (PUCHAR) (CacheEntry + 1);
|
|
|
|
//
|
|
// Copy in the sid
|
|
//
|
|
CacheEntry->Sid = (PSID) Where;
|
|
Where += RtlLengthSid( UserSid );
|
|
|
|
RtlCopyMemory(
|
|
CacheEntry->Sid,
|
|
UserSid,
|
|
Where - (PUCHAR) CacheEntry->Sid
|
|
);
|
|
|
|
//
|
|
// Put the various strings
|
|
//
|
|
|
|
KerbPutString(
|
|
LogonUserName,
|
|
&CacheEntry->LogonUserName,
|
|
0, // no offset
|
|
&Where
|
|
);
|
|
|
|
KerbPutString(
|
|
LogonDomainName,
|
|
&CacheEntry->LogonDomainName,
|
|
0, // no offset
|
|
&Where
|
|
);
|
|
|
|
KerbPutString(
|
|
LogonRealm,
|
|
&CacheEntry->LogonRealm,
|
|
0, // no offset
|
|
&Where
|
|
);
|
|
|
|
//
|
|
// Insert it into the list
|
|
//
|
|
|
|
KerbLockList( &KerbSidCache );
|
|
KerbInsertListEntry(
|
|
&CacheEntry->Next,
|
|
&KerbSidCache
|
|
);
|
|
//
|
|
// Dereference it because we aren't returning the cache entry
|
|
//
|
|
|
|
KerbDereferenceListEntry(
|
|
&CacheEntry->Next,
|
|
&KerbSidCache
|
|
);
|
|
|
|
KerbSidCacheEntries++;
|
|
|
|
//
|
|
// Remove any extra entries
|
|
//
|
|
|
|
KerbScavengeSidCache();
|
|
|
|
KerbUnlockList ( &KerbSidCache );
|
|
|
|
Cleanup:
|
|
if (NT_SUCCESS(Status))
|
|
{
|
|
KerbWriteSidCache();
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
//+-------------------------------------------------------------------------
|
|
//
|
|
// Function: KerbWriteMachineSid
|
|
//
|
|
// Synopsis: Writes the machine account sid to the registry
|
|
//
|
|
// Effects:
|
|
//
|
|
// Arguments: MachineSid - If present, is stored. If not present,
|
|
// is deleted from registry
|
|
//
|
|
// Requires:
|
|
//
|
|
// Returns:
|
|
//
|
|
// Notes:
|
|
//
|
|
//
|
|
//--------------------------------------------------------------------------
|
|
|
|
VOID
|
|
KerbWriteMachineSid(
|
|
IN OPTIONAL PSID MachineSid
|
|
)
|
|
{
|
|
if (ARGUMENT_PRESENT(MachineSid))
|
|
{
|
|
(VOID) RegSetValueEx(
|
|
KerbSidCacheKey,
|
|
KERB_MACHINE_SID_CACHE_NAME,
|
|
0, // reserved
|
|
REG_BINARY,
|
|
(PUCHAR) MachineSid,
|
|
RtlLengthSid(MachineSid)
|
|
);
|
|
}
|
|
else
|
|
{
|
|
(VOID) RegDeleteValue(
|
|
KerbSidCacheKey,
|
|
KERB_MACHINE_SID_CACHE_NAME
|
|
);
|
|
}
|
|
}
|
|
|
|
|
|
//+-------------------------------------------------------------------------
|
|
//
|
|
// Function: Reads the machine sid from the registry
|
|
//
|
|
// Synopsis:
|
|
//
|
|
// Effects:
|
|
//
|
|
// Arguments:
|
|
//
|
|
// Requires:
|
|
//
|
|
// Returns:
|
|
//
|
|
// Notes:
|
|
//
|
|
//
|
|
//--------------------------------------------------------------------------
|
|
|
|
|
|
NTSTATUS
|
|
KerbGetMachineSid(
|
|
OUT PSID * MachineSid
|
|
)
|
|
{
|
|
BYTE Buffer[sizeof(SID) + SID_MAX_SUB_AUTHORITIES * sizeof(ULONG)];
|
|
ULONG BufferSize = sizeof(Buffer);
|
|
PSID Sid = (PSID) Buffer;
|
|
DWORD RegErr;
|
|
NTSTATUS Status = STATUS_SUCCESS;
|
|
ULONG ValueType;
|
|
|
|
*MachineSid = NULL;
|
|
RegErr = RegQueryValueEx(
|
|
KerbSidCacheKey,
|
|
KERB_MACHINE_SID_CACHE_NAME,
|
|
NULL,
|
|
&ValueType,
|
|
Buffer,
|
|
&BufferSize
|
|
);
|
|
if (RegErr != ERROR_SUCCESS)
|
|
{
|
|
DebugLog((DEB_ERROR,"Failed to query for machine sid value: %d\n",
|
|
RegErr ));
|
|
Status = STATUS_OBJECT_NAME_NOT_FOUND;
|
|
goto Cleanup;
|
|
}
|
|
|
|
//
|
|
// If it isn't valid, delete it now
|
|
//
|
|
|
|
if (!RtlValidSid(Sid))
|
|
{
|
|
(VOID) RegDeleteValue(
|
|
KerbSidCacheKey,
|
|
KERB_MACHINE_SID_CACHE_NAME
|
|
);
|
|
}
|
|
|
|
*MachineSid = (PSID) KerbAllocate(RtlLengthSid(Buffer));
|
|
|
|
if (*MachineSid == NULL)
|
|
{
|
|
Status = STATUS_INSUFFICIENT_RESOURCES;
|
|
goto Cleanup;
|
|
}
|
|
RtlCopyMemory(
|
|
*MachineSid,
|
|
Sid,
|
|
RtlLengthSid(Sid)
|
|
);
|
|
|
|
Cleanup:
|
|
return(Status);
|
|
|
|
}
|