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764 lines
20 KiB
764 lines
20 KiB
//+-----------------------------------------------------------------------
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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: transit.cxx
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//
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// Contents: Code for compressing transitive realm list
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//
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//
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// History:
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//
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//------------------------------------------------------------------------
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#include "kdcsvr.hxx"
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#include <alloca.h>
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//+-----------------------------------------------------------------------
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//
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// Function: KerbAppendString
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//
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// Synopsis: Appends to unicode strings together and allocates the output
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//
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// Effects:
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//
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// Parameters: Output - Output appended String
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// InputTail - Trailing portion of input
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// InputHead - Head potion of input
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//
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//
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// Return:
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//
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// Notes:
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//
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//------------------------------------------------------------------------
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NTSTATUS
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KerbAppendString(
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OUT PUNICODE_STRING Output,
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IN PUNICODE_STRING InputTail,
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IN PUNICODE_STRING InputHead
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)
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{
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Output->Buffer = NULL;
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Output->Length = InputHead->Length + InputTail->Length;
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if ((InputHead->Buffer == NULL) && (InputTail->Buffer == NULL))
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{
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Output->MaximumLength = 0;
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return(STATUS_SUCCESS);
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}
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else
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{
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Output->MaximumLength = Output->Length + sizeof(WCHAR);
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}
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Output->Buffer = (LPWSTR) MIDL_user_allocate(Output->MaximumLength);
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if (Output->Buffer == NULL)
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{
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return(STATUS_INSUFFICIENT_RESOURCES);
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}
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RtlCopyMemory(
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Output->Buffer,
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InputHead->Buffer,
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InputHead->Length
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);
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RtlCopyMemory(
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Output->Buffer + InputHead->Length / sizeof(WCHAR),
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InputTail->Buffer,
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InputTail->Length
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);
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Output->Buffer[Output->Length/sizeof(WCHAR)] = L'\0';
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return(STATUS_SUCCESS);
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}
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typedef enum _KERB_DOMAIN_COMPARISON {
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Above,
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Below,
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Equal,
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NotEqual
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} KERB_DOMAIN_COMPARISON, *PKERB_DOMAIN_COMPARISON;
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//+-----------------------------------------------------------------------
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//
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// Function: KerbCompareDomains
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//
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// Synopsis: Compares two domain names and returns whether one is a
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// prefix of the other, and the offset of the prefix.
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//
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// Effects:
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//
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// Parameters:
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//
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// Return: Above - domain1 is a postfix of domain2
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// Below - domain2 is a postfix of domain1
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// Equal - the domains are equal
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// NotEqual - the domains are not equal and not above or below
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//
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// Notes: This does not work for x-500 realm names (/foo/bar)
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//
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//------------------------------------------------------------------------
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KERB_DOMAIN_COMPARISON
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KerbCompareDomains(
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IN PUNICODE_STRING Domain1,
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IN PUNICODE_STRING Domain2,
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OUT PULONG PostfixOffset
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)
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{
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UNICODE_STRING TempString;
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if (Domain1->Length > Domain2->Length)
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{
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TempString.Length = TempString.MaximumLength = Domain2->Length;
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TempString.Buffer = Domain1->Buffer + (Domain1->Length - Domain2->Length) / sizeof(WCHAR);
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if (RtlEqualUnicodeString(
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&TempString,
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Domain2,
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TRUE) && TempString.Buffer[-1] == '.')
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{
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*PostfixOffset = (Domain1->Length - Domain2->Length) / sizeof(WCHAR);
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return(Below);
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}
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else
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{
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return(NotEqual);
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}
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}
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else if (Domain1->Length < Domain2->Length)
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{
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TempString.Length = TempString.MaximumLength = Domain1->Length;
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TempString.Buffer = Domain2->Buffer + (Domain2->Length - Domain1->Length) / sizeof(WCHAR);
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if (RtlEqualUnicodeString(
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&TempString,
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Domain1,
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TRUE) && TempString.Buffer[-1] == '.')
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{
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*PostfixOffset = (Domain2->Length - Domain1->Length) / sizeof(WCHAR);
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return(Above);
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}
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else
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{
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return(NotEqual);
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}
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}
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else if (RtlEqualUnicodeString(Domain1,Domain2, TRUE))
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{
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*PostfixOffset = 0;
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return(Equal);
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}
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else
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{
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return(NotEqual);
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}
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}
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//+-----------------------------------------------------------------------
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//
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// Function: KdcExpandTranistedRealms
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//
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// Synopsis: Expands the transited realm field into an array of realms
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//
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// Effects: Allocates an array of realm names
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//
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// Parameters: FullRealmList - receives the full list of realms
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// CountOfRealms - receveies the number of entries in the list
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// TranistedList - The transited field to expand
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//
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// Return:
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//
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// Notes:
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//
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//------------------------------------------------------------------------
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KERBERR
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KdcExpandTransitedRealms(
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OUT PUNICODE_STRING * FullRealmList,
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OUT PULONG CountOfRealms,
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IN PUNICODE_STRING TransitedList
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)
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{
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KERBERR KerbErr = KDC_ERR_NONE;
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ULONG RealmCount;
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ULONG Index;
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ULONG RealmIndex;
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PUNICODE_STRING RealmList = NULL;
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UNICODE_STRING CurrentRealm;
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*FullRealmList = NULL;
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*CountOfRealms = 0;
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//
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// First count the number of realms in the tranisted list. We can do
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// this by counting the number of ',' in the list. Note: if the encoding
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// is compressed by using a null entry to include all domains in a path
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// up or down a hierarchy, this code will fail.
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//
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if (TransitedList->Length == 0)
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{
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return(KDC_ERR_NONE);
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}
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RealmCount = 1;
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for (Index = 0; Index < TransitedList->Length / sizeof(WCHAR) ; Index++ )
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{
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if (TransitedList->Buffer[Index] == ',')
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{
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RealmCount++;
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//
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// Check for a ',,' compression indicating that all the
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// realms between two names have been traversed.
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// BUG 453997: we don't handle this yet.
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//
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if ( (Index == 0) ||
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(Index == (TransitedList->Length / sizeof(WCHAR)) -1) ||
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(TransitedList->Buffer[Index-1] == L','))
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{
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DebugLog((DEB_ERROR,"BUG 453997:: hit overcompressed transited encoding: %wZ\n",
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TransitedList ));
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KerbErr = KRB_ERR_GENERIC;
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goto Cleanup;
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}
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}
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}
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//
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// We now have a the count of realms. Allocate an array of UNICODE_STRING
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// structures to hold the realms.
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//
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RealmList = (PUNICODE_STRING) MIDL_user_allocate(RealmCount * sizeof(UNICODE_STRING));
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if (RealmList == NULL)
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{
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KerbErr = KRB_ERR_GENERIC;
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goto Cleanup;
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}
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RtlZeroMemory(
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RealmList,
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RealmCount * sizeof(UNICODE_STRING)
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);
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//
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// Now loop through and insert the full names of all the domains into
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// the list
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//
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RealmIndex = 0;
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CurrentRealm = *TransitedList;
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for (Index = 0; Index <= TransitedList->Length / sizeof(WCHAR) ; Index++ )
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{
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//
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// If we hit the end of the string or found a ',', split off a
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// new realm.
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//
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if ((Index == TransitedList->Length / sizeof(WCHAR)) ||
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(TransitedList->Buffer[Index] == ',' ))
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{
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//
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// Check for a ',,' compression indicating that all the
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// realms between two names have been traversed.
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// BUG 453997:: we don't handle this yet.
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//
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if ( (Index == 0) ||
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(Index == (TransitedList->Length / sizeof(WCHAR)) -1) ||
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(TransitedList->Buffer[Index-1] == L','))
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{
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DebugLog((DEB_ERROR,"BUG 453997:: hit overcompressed transited encoding: %wZ\n",
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TransitedList ));
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KerbErr = KRB_ERR_GENERIC;
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goto Cleanup;
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}
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CurrentRealm.Length = CurrentRealm.MaximumLength =
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(USHORT)(&TransitedList->Buffer[Index] - CurrentRealm.Buffer) * sizeof(WCHAR);
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//
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// Check for a trailing '.' - if so, append it
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// to the parent
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//
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if (TransitedList->Buffer[Index-1] == '.')
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{
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//
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// This is a compressed name, so append it to the previous
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// name
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//
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if (RealmIndex == 0)
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{
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DebugLog((DEB_ERROR,"First element in transited encoding has a trailing '.': %wZ\n",
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TransitedList ));
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KerbErr = KRB_ERR_GENERIC;
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goto Cleanup;
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}
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if (!NT_SUCCESS(KerbAppendString(
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&RealmList[RealmIndex],
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&RealmList[RealmIndex-1],
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&CurrentRealm)))
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{
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KerbErr = KRB_ERR_GENERIC;
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goto Cleanup;
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}
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}
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else if ((RealmIndex != 0) && (CurrentRealm.Buffer[0] == '/'))
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{
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if (!NT_SUCCESS(KerbAppendString(
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&RealmList[RealmIndex],
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&CurrentRealm,
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&RealmList[RealmIndex-1]
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)))
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{
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KerbErr = KRB_ERR_GENERIC;
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goto Cleanup;
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}
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}
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else if (!NT_SUCCESS(KerbDuplicateString(
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&RealmList[RealmIndex],
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&CurrentRealm)))
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{
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KerbErr = KRB_ERR_GENERIC;
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goto Cleanup;
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}
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CurrentRealm.Buffer =CurrentRealm.Buffer + 1 + CurrentRealm.Length/sizeof(WCHAR);
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RealmIndex++;
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}
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}
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DsysAssert(RealmIndex == RealmCount);
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*FullRealmList = RealmList;
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*CountOfRealms = RealmCount;
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Cleanup:
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if (!KERB_SUCCESS(KerbErr))
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{
|
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if (RealmList != NULL)
|
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{
|
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for (RealmIndex = 0; RealmIndex < RealmCount ; RealmIndex++ )
|
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{
|
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KerbFreeString(&RealmList[RealmIndex]);
|
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}
|
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MIDL_user_free(RealmList);
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}
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}
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return(KerbErr);
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}
|
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|
|
|
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//+-----------------------------------------------------------------------
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//
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// Function: KdcCompressTransitedRealms
|
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//
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// Synopsis: Compresses an ordered list of realms by removing
|
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// redundant information.
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//
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|
// Effects: Allocates an output string
|
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//
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// Parameters: CompressedRealms - receives the compressed list of realms
|
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// RealmList - List of domains to compress
|
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// RealmCount - number of entries in realm list
|
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// NewRealm - new realm to add to the lsit
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// NewRealmIndex - Location before which to insert the new
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// realm
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//
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// Return:
|
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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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KERBERR
|
|
KdcCompressTransitedRealms(
|
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OUT PUNICODE_STRING CompressedRealms,
|
|
IN PUNICODE_STRING RealmList,
|
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IN ULONG RealmCount,
|
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IN PUNICODE_STRING NewRealm,
|
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IN ULONG NewRealmIndex
|
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)
|
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{
|
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UNICODE_STRING OutputRealms = {0};
|
|
ULONG OutputRealmLength = 0;
|
|
KERBERR KerbErr = KDC_ERR_NONE;
|
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ULONG Index;
|
|
ULONG InsertionIndex;
|
|
PWCHAR Where;
|
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PUNICODE_STRING PreviousName = NULL;
|
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PUNICODE_STRING CurrentName;
|
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ULONG PostfixOffset;
|
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UNICODE_STRING NameToAdd;
|
|
|
|
RtlInitUnicodeString(
|
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CompressedRealms,
|
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NULL
|
|
);
|
|
|
|
//
|
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// Initialize all variables
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//
|
|
|
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Index = 0;
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CurrentName = NULL;
|
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InsertionIndex = NewRealmIndex;
|
|
|
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//
|
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// First, compute the length of compressed output realms
|
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//
|
|
|
|
while (Index <= RealmCount)
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{
|
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PreviousName = CurrentName;
|
|
|
|
//
|
|
// If this is the index to insert, add the new realm
|
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//
|
|
|
|
if (InsertionIndex == Index)
|
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{
|
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CurrentName = NewRealm;
|
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}
|
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else if (Index == RealmCount)
|
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{
|
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//
|
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// If we already added all the original realms, get out now
|
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//
|
|
|
|
break;
|
|
}
|
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else
|
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{
|
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CurrentName = &RealmList[Index];
|
|
}
|
|
|
|
NameToAdd = *CurrentName;
|
|
|
|
//
|
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// If the previous name is above this one, lop off the postfix from
|
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// this name
|
|
//
|
|
|
|
if ((PreviousName != NULL) &&
|
|
KerbCompareDomains(
|
|
PreviousName,
|
|
CurrentName,
|
|
&PostfixOffset
|
|
) == Above)
|
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{
|
|
NameToAdd.Length = (USHORT) PostfixOffset * sizeof(WCHAR);
|
|
}
|
|
|
|
if ( OutputRealmLength != 0 )
|
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{
|
|
OutputRealmLength += sizeof( WCHAR );
|
|
}
|
|
|
|
OutputRealmLength += NameToAdd.Length;
|
|
|
|
//
|
|
// If we inserted the transited realm here, run through the loop
|
|
// again with the same index.
|
|
//
|
|
|
|
if (InsertionIndex == Index)
|
|
{
|
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InsertionIndex = 0xffffffff;
|
|
}
|
|
else
|
|
{
|
|
Index++;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Account for the trailing NULL
|
|
//
|
|
|
|
OutputRealmLength += sizeof( WCHAR );
|
|
|
|
//
|
|
// Output must fit inside a UNICODE_STRING
|
|
//
|
|
|
|
if ( OutputRealmLength > MAXUSHORT )
|
|
{
|
|
KerbErr = KRB_ERR_GENERIC;
|
|
goto Cleanup;
|
|
}
|
|
|
|
//
|
|
// Re-initialize all variables
|
|
//
|
|
|
|
Index = 0;
|
|
CurrentName = NULL;
|
|
InsertionIndex = NewRealmIndex;
|
|
|
|
SafeAllocaAllocate( OutputRealms.Buffer, OutputRealmLength );
|
|
|
|
if ( OutputRealms.Buffer == NULL ) {
|
|
|
|
KerbErr = KRB_ERR_GENERIC;
|
|
goto Cleanup;
|
|
}
|
|
|
|
OutputRealms.MaximumLength = (USHORT)OutputRealmLength;
|
|
OutputRealms.Length = 0;
|
|
Where = OutputRealms.Buffer;
|
|
|
|
//
|
|
// Now, on to actual copying
|
|
//
|
|
|
|
while (Index <= RealmCount)
|
|
{
|
|
PreviousName = CurrentName;
|
|
|
|
//
|
|
// If this is the index to insert, add the new realm
|
|
//
|
|
|
|
if (InsertionIndex == Index)
|
|
{
|
|
CurrentName = NewRealm;
|
|
}
|
|
else if (Index == RealmCount)
|
|
{
|
|
//
|
|
// If we already added all the original realms, get out now
|
|
//
|
|
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
CurrentName = &RealmList[Index];
|
|
}
|
|
|
|
NameToAdd = *CurrentName;
|
|
|
|
//
|
|
// If the previous name is above this one, lop off the postfix from
|
|
// this name
|
|
//
|
|
|
|
if ((PreviousName != NULL) &&
|
|
KerbCompareDomains(
|
|
PreviousName,
|
|
CurrentName,
|
|
&PostfixOffset
|
|
) == Above)
|
|
{
|
|
NameToAdd.Length = (USHORT) PostfixOffset * sizeof(WCHAR);
|
|
}
|
|
|
|
if (OutputRealms.Length != 0)
|
|
{
|
|
*Where++ = L',';
|
|
OutputRealms.Length += sizeof(WCHAR);
|
|
}
|
|
|
|
DsysAssert(OutputRealms.Length + NameToAdd.Length < OutputRealms.MaximumLength);
|
|
|
|
RtlCopyMemory(
|
|
Where,
|
|
NameToAdd.Buffer,
|
|
NameToAdd.Length
|
|
);
|
|
|
|
Where += NameToAdd.Length/sizeof(WCHAR);
|
|
OutputRealms.Length = OutputRealms.Length + NameToAdd.Length;
|
|
|
|
//
|
|
// If we inserted the transited realm here, run through the loop
|
|
// again with the same index.
|
|
//
|
|
|
|
if (InsertionIndex == Index)
|
|
{
|
|
InsertionIndex = 0xffffffff;
|
|
}
|
|
else
|
|
{
|
|
Index++;
|
|
}
|
|
}
|
|
|
|
*Where++ = L'\0';
|
|
|
|
if (!NT_SUCCESS(KerbDuplicateString(
|
|
CompressedRealms,
|
|
&OutputRealms)))
|
|
{
|
|
KerbErr = KRB_ERR_GENERIC;
|
|
goto Cleanup;
|
|
}
|
|
|
|
Cleanup:
|
|
|
|
SafeAllocaFree( OutputRealms.Buffer );
|
|
|
|
return(KerbErr);
|
|
}
|
|
|
|
|
|
//+-----------------------------------------------------------------------
|
|
//
|
|
// Function: KdcInsertTransitedRealm
|
|
//
|
|
// Synopsis: Inserts the referree's realm into the tranisted encoding
|
|
// in a ticket. This uses domain-x500-compress which
|
|
// eliminates redundant information when one domain is the
|
|
// prefix or suffix of another.
|
|
//
|
|
// Effects: Allocates output buffer
|
|
//
|
|
// Parameters: NewTransitedField - receives the new tranisted field, to
|
|
// be freed with KerbFreeString
|
|
// OldTransitedField - the existing transited frield.
|
|
// ClientRealm - Realm of client (from ticket)
|
|
// TransitedRealm - Realm of referring domain
|
|
// OurRealm - Our realm name
|
|
//
|
|
// Return:
|
|
//
|
|
// Notes:
|
|
//
|
|
//------------------------------------------------------------------------
|
|
|
|
KERBERR
|
|
KdcInsertTransitedRealm(
|
|
OUT PUNICODE_STRING NewTransitedField,
|
|
IN PUNICODE_STRING OldTransitedField,
|
|
IN PUNICODE_STRING ClientRealm,
|
|
IN PUNICODE_STRING TransitedRealm,
|
|
IN PUNICODE_STRING OurRealm
|
|
)
|
|
{
|
|
KERBERR KerbErr = KDC_ERR_NONE;
|
|
PUNICODE_STRING FullDomainList = NULL;
|
|
ULONG CountOfDomains;
|
|
ULONG NewEntryIndex = 0xffffffff;
|
|
ULONG PostfixOffset;
|
|
ULONG Index;
|
|
KERB_DOMAIN_COMPARISON Comparison = NotEqual;
|
|
KERB_DOMAIN_COMPARISON LastComparison;
|
|
|
|
//
|
|
// The first thing to do is to expand the existing transited field. This
|
|
// is because the compression scheme does not allow new domains to simply
|
|
// append or insert information - the encoding of existing realms
|
|
// can change. For example, going from a domain to its parent means
|
|
// that the original domain can be encoded as a prefix of the parent
|
|
// whereas originally it was a name unto itself.
|
|
//
|
|
|
|
D_DebugLog((DEB_T_TRANSIT, "Inserted realm %wZ into list %wZ for client fomr %wZ\n",
|
|
TransitedRealm, OldTransitedField, ClientRealm ));
|
|
|
|
KerbErr = KdcExpandTransitedRealms(
|
|
&FullDomainList,
|
|
&CountOfDomains,
|
|
OldTransitedField
|
|
);
|
|
if (!KERB_SUCCESS(KerbErr))
|
|
{
|
|
goto Cleanup;
|
|
}
|
|
|
|
//
|
|
// Now loop through the domains. Based on the compression, we know that
|
|
// higher up domains come first.
|
|
//
|
|
|
|
for (Index = 0; Index < CountOfDomains ; Index++ )
|
|
{
|
|
LastComparison = Comparison;
|
|
|
|
Comparison = KerbCompareDomains(
|
|
TransitedRealm,
|
|
&FullDomainList[Index],
|
|
&PostfixOffset
|
|
);
|
|
if (Comparison == Above)
|
|
{
|
|
//
|
|
// If the new domain is above an existing domain, it gets inserted
|
|
// before the existing domain because all the existing domains
|
|
// are ordered from top to bottom
|
|
//
|
|
NewEntryIndex = Index;
|
|
break;
|
|
}
|
|
else if (Comparison == Below)
|
|
{
|
|
//
|
|
// There may be other domains below which are closer, so
|
|
// store the result and continue.
|
|
//
|
|
LastComparison = Comparison;
|
|
}
|
|
else if (Comparison == NotEqual)
|
|
{
|
|
//
|
|
// The domains aren't above or below each other. If the last
|
|
// comparison was below, stick the domain underneath it.
|
|
//
|
|
if (LastComparison == Below)
|
|
{
|
|
NewEntryIndex = Index;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// If we didn't find a place for it, stick it in at the end.
|
|
//
|
|
|
|
if (NewEntryIndex == 0xffffffff)
|
|
{
|
|
NewEntryIndex = Index;
|
|
}
|
|
|
|
//
|
|
// Now build the new encoding
|
|
//
|
|
|
|
KerbErr = KdcCompressTransitedRealms(
|
|
NewTransitedField,
|
|
FullDomainList,
|
|
CountOfDomains,
|
|
TransitedRealm,
|
|
NewEntryIndex
|
|
);
|
|
if (!KERB_SUCCESS(KerbErr))
|
|
{
|
|
goto Cleanup;
|
|
}
|
|
|
|
Cleanup:
|
|
if (FullDomainList != NULL)
|
|
{
|
|
for (Index = 0; Index < CountOfDomains ; Index++ )
|
|
{
|
|
KerbFreeString(&FullDomainList[Index]);
|
|
}
|
|
MIDL_user_free(FullDomainList);
|
|
}
|
|
|
|
return(KerbErr);
|
|
}
|