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/* cyglsa.c: LSA authentication module for Cygwin
Copyright 2006, 2008, 2010, 2011 Red Hat, Inc.
Written by Corinna Vinschen <corinna@vinschen.de>
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for details. */
#define WINVER 0x0600
#include <ntstatus.h>
#include <wchar.h>
#include <windows.h>
#include <wininet.h>
#include <lmcons.h>
#include <iptypes.h>
#include <ntsecapi.h>
#include "../cygwin/cyglsa.h"
#include "../cygwin/include/cygwin/version.h"
static PLSA_SECPKG_FUNCS funcs;
static BOOL must_create_logon_sid;
BOOL APIENTRY
DllMain (HINSTANCE inst, DWORD reason, LPVOID res)
{
switch (reason)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
/* Declare NTDLL functions here to avoid problems with different
header file layout in different compiler environments. */
#ifndef NT_SUCCESS
#define NT_SUCCESS(s) ((s) >= 0)
#endif
NTSTATUS NTAPI NtAllocateLocallyUniqueId (PLUID);
NTSTATUS NTAPI RtlCopySid (ULONG, PSID, PSID);
NTSTATUS NTAPI RtlGetAce (PACL, ULONG, PVOID *);
ULONG NTAPI RtlLengthSid (PSID);
PULONG NTAPI RtlSubAuthoritySid (PSID, ULONG);
PUCHAR NTAPI RtlSubAuthorityCountSid (PSID);
BOOLEAN NTAPI RtlValidSid (PSID);
#ifndef RtlInitEmptyUnicodeString
__inline VOID NTAPI
RtlInitEmptyUnicodeString(PUNICODE_STRING dest, PCWSTR buf, USHORT len)
{
dest->Length = 0;
dest->MaximumLength = len;
dest->Buffer = (PWSTR) buf;
}
#endif
static PUNICODE_STRING
uni_alloc (PWCHAR src, USHORT len)
{
PUNICODE_STRING tgt;
if (!(tgt = funcs->AllocateLsaHeap (sizeof (UNICODE_STRING))))
return NULL;
tgt->Length = len * sizeof (WCHAR);
tgt->MaximumLength = tgt->Length + sizeof (WCHAR);
if (!(tgt->Buffer = funcs->AllocateLsaHeap (tgt->MaximumLength)))
{
funcs->FreeLsaHeap (tgt);
return NULL;
}
wcscpy (tgt->Buffer, src);
return tgt;
}
/* No, I don't want to include stdio.h so I take what ntdll offers. */
extern int _vsnprintf (char *, size_t, const char *, va_list);
static HANDLE fh = INVALID_HANDLE_VALUE;
static int
cyglsa_printf (const char *format, ...)
{
char buf[256];
DWORD wr;
int ret;
va_list ap;
if (fh == INVALID_HANDLE_VALUE)
return 0;
va_start (ap, format);
ret = _vsnprintf (buf, 256, format, ap);
va_end (ap);
if (ret <= 0)
return ret;
if (ret > 256)
ret = 255;
buf[255] = '\0';
WriteFile (fh, buf, ret, &wr, NULL);
return wr;
}
static void
print_sid (const char *prefix, int idx, PISID sid)
{
DWORD i;
cyglsa_printf ("%s", prefix);
if (idx >= 0)
cyglsa_printf ("[%d] ", idx);
cyglsa_printf ("(0x%08x) ", (INT_PTR) sid);
if (!sid)
cyglsa_printf ("NULL\n");
else if (IsBadReadPtr (sid, 8))
cyglsa_printf ("INVALID POINTER\n");
else if (!RtlValidSid ((PSID) sid))
cyglsa_printf ("INVALID SID\n");
else if (IsBadReadPtr (sid, 8 + sizeof (DWORD) * sid->SubAuthorityCount))
cyglsa_printf ("INVALID POINTER SPACE\n");
else
{
cyglsa_printf ("S-%d-%d", sid->Revision, sid->IdentifierAuthority.Value[5]);
for (i = 0; i < sid->SubAuthorityCount; ++i)
cyglsa_printf ("-%lu", sid->SubAuthority[i]);
cyglsa_printf ("\n");
}
}
static void
print_groups (PTOKEN_GROUPS grps)
{
DWORD i;
cyglsa_printf ("Groups: (0x%08x) ", (INT_PTR) grps);
if (!grps)
cyglsa_printf ("NULL\n");
else if (IsBadReadPtr (grps, sizeof (DWORD)))
cyglsa_printf ("INVALID POINTER\n");
else if (IsBadReadPtr (grps, sizeof (DWORD) + sizeof (SID_AND_ATTRIBUTES)
* grps->GroupCount))
cyglsa_printf ("INVALID POINTER SPACE\n");
else
{
cyglsa_printf ("Count: %lu\n", grps->GroupCount);
for (i = 0; i < grps->GroupCount; ++i)
{
cyglsa_printf ("(attr: 0x%lx)", grps->Groups[i].Attributes);
print_sid (" ", i, (PISID) grps->Groups[i].Sid);
}
}
}
static void
print_privs (PTOKEN_PRIVILEGES privs)
{
DWORD i;
cyglsa_printf ("Privileges: (0x%08x) ", (INT_PTR) privs);
if (!privs)
cyglsa_printf ("NULL\n");
else if (IsBadReadPtr (privs, sizeof (DWORD)))
cyglsa_printf ("INVALID POINTER\n");
else if (IsBadReadPtr (privs, sizeof (DWORD) + sizeof (LUID_AND_ATTRIBUTES)
* privs->PrivilegeCount))
cyglsa_printf ("INVALID POINTER SPACE\n");
else
{
cyglsa_printf ("Count: %lu\n", privs->PrivilegeCount);
for (i = 0; i < privs->PrivilegeCount; ++i)
cyglsa_printf ("Luid: {%ld, %lu} Attributes: 0x%lx\n",
privs->Privileges[i].Luid.HighPart,
privs->Privileges[i].Luid.LowPart,
privs->Privileges[i].Attributes);
}
}
static void
print_dacl (PACL dacl)
{
DWORD i;
cyglsa_printf ("DefaultDacl: (0x%08x) ", (INT_PTR) dacl);
if (!dacl)
cyglsa_printf ("NULL\n");
else if (IsBadReadPtr (dacl, sizeof (ACL)))
cyglsa_printf ("INVALID POINTER\n");
else if (IsBadReadPtr (dacl, dacl->AclSize))
cyglsa_printf ("INVALID POINTER SPACE\n");
else
{
cyglsa_printf ("Rev: %d, Count: %d\n", dacl->AclRevision, dacl->AceCount);
for (i = 0; i < dacl->AceCount; ++i)
{
PVOID vace;
PACCESS_ALLOWED_ACE ace;
NTSTATUS stat;
stat = RtlGetAce (dacl, i, &vace);
if (!NT_SUCCESS (stat))
cyglsa_printf ("[%lu] RtlGetAce status 0x%08lx\n", i, stat);
else
{
ace = (PACCESS_ALLOWED_ACE) vace;
cyglsa_printf ("Type: %x, Flags: %x, Access: %lx,",
ace->Header.AceType, ace->Header.AceFlags, (DWORD) ace->Mask);
print_sid (" ", i, (PISID) &ace->SidStart);
}
}
}
}
static void
print_tokinf (PLSA_TOKEN_INFORMATION_V2 ptok, size_t size,
PVOID got_start, PVOID gotinf_start, PVOID gotinf_end)
{
if (fh == INVALID_HANDLE_VALUE)
return;
cyglsa_printf ("INCOMING: start: 0x%08x infstart: 0x%08x infend: 0x%08x\n",
(INT_PTR) got_start, (INT_PTR) gotinf_start,
(INT_PTR) gotinf_end);
cyglsa_printf ("LSA_TOKEN_INFORMATION_V2: 0x%08x - 0x%08x\n",
(INT_PTR) ptok, (INT_PTR) ptok + size);
/* User SID */
cyglsa_printf ("User: (attr: 0x%lx)", ptok->User.User.Attributes);
print_sid (" ", -1, (PISID) ptok->User.User.Sid);
/* Groups */
print_groups (ptok->Groups);
/* Primary Group SID */
print_sid ("Primary Group: ", -1, (PISID)ptok->PrimaryGroup.PrimaryGroup);
/* Privileges */
print_privs (ptok->Privileges);
/* Owner */
print_sid ("Owner: ", -1, (PISID) ptok->Owner.Owner);
/* Default DACL */
print_dacl (ptok->DefaultDacl.DefaultDacl);
// CloseHandle (fh);
}
NTSTATUS NTAPI
LsaApInitializePackage (ULONG authp_id, PLSA_SECPKG_FUNCS dpt,
PLSA_STRING dummy1, PLSA_STRING dummy2,
PLSA_STRING *authp_name)
{
PLSA_STRING name = NULL;
DWORD vers, major, minor;
/* Set global pointer to lsa helper function table. */
funcs = dpt;
/* Allocate and set the name of the authentication package. This is the
name which has to be used in LsaLookupAuthenticationPackage. */
if (!(name = funcs->AllocateLsaHeap (sizeof *name)))
return STATUS_NO_MEMORY;
if (!(name->Buffer = funcs->AllocateLsaHeap (sizeof (CYG_LSA_PKGNAME))))
{
funcs->FreeLsaHeap (name);
return STATUS_NO_MEMORY;
}
name->Length = sizeof (CYG_LSA_PKGNAME) - 1;
name->MaximumLength = sizeof (CYG_LSA_PKGNAME);
strcpy (name->Buffer, CYG_LSA_PKGNAME);
(*authp_name) = name;
vers = GetVersion ();
major = LOBYTE (LOWORD (vers));
minor = HIBYTE (LOWORD (vers));
/* Check if we're running on Windows 2000 or lower. If so, we must create
the logon sid in the group list by ourselves. */
if (major < 5 || (major == 5 && minor == 0))
must_create_logon_sid = TRUE;
#ifdef DEBUGGING
fh = CreateFile ("C:\\cyglsa.dbgout", GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
cyglsa_printf ("Initialized\n");
#endif /* DEBUGGING */
return STATUS_SUCCESS;
}
NTSTATUS NTAPI
LsaApLogonUserEx (PLSA_CLIENT_REQUEST request, SECURITY_LOGON_TYPE logon_type,
PVOID auth, PVOID client_auth_base, ULONG auth_len,
PVOID *pbuf, PULONG pbuf_len, PLUID logon_id,
PNTSTATUS sub_stat, PLSA_TOKEN_INFORMATION_TYPE tok_type,
PVOID *tok, PUNICODE_STRING *account,
PUNICODE_STRING *authority, PUNICODE_STRING *machine)
{
DWORD checksum, i;
PDWORD csp, csp_end;
NTSTATUS stat;
SECPKG_CLIENT_INFO clinf;
PLSA_TOKEN_INFORMATION_V2 tokinf;
cyglsa_t *authinf = (cyglsa_t *) auth;
/* Check if the caller has the SeTcbPrivilege, otherwise refuse service. */
stat = funcs->GetClientInfo (&clinf);
if (stat != STATUS_SUCCESS)
{
cyglsa_printf ("GetClientInfo failed: 0x%08lx\n", stat);
return stat;
}
if (!clinf.HasTcbPrivilege)
{
cyglsa_printf ("Client has no TCB privilege. Access denied.\n");
return STATUS_ACCESS_DENIED;
}
/* Make a couple of validity checks. */
if (auth_len < sizeof *authinf
|| authinf->magic != CYG_LSA_MAGIC
|| !authinf->username[0]
|| !authinf->domain[0])
{
cyglsa_printf ("Invalid authentication parameter.\n");
return STATUS_INVALID_PARAMETER;
}
checksum = CYG_LSA_MAGIC;
csp = (PDWORD) &authinf->username;
csp_end = (PDWORD) ((PBYTE) authinf + auth_len);
while (csp < csp_end)
checksum += *csp++;
if (authinf->checksum != checksum)
{
cyglsa_printf ("Invalid checksum.\n");
return STATUS_INVALID_PARAMETER_3;
}
/* Set account to username and authority to domain resp. machine name.
The name of the logon account name as returned by LookupAccountSid
is created from here as "authority\account". */
authinf->username[UNLEN] = '\0';
authinf->domain[MAX_DOMAIN_NAME_LEN] = '\0';
if (account && !(*account = uni_alloc (authinf->username,
wcslen (authinf->username))))
{
cyglsa_printf ("No memory trying to create account.\n");
return STATUS_NO_MEMORY;
}
if (authority && !(*authority = uni_alloc (authinf->domain,
wcslen (authinf->domain))))
{
cyglsa_printf ("No memory trying to create authority.\n");
return STATUS_NO_MEMORY;
}
if (machine)
{
WCHAR mach[MAX_COMPUTERNAME_LENGTH + 1];
DWORD msize = MAX_COMPUTERNAME_LENGTH + 1;
if (!GetComputerNameW (mach, &msize))
wcscpy (mach, L"UNKNOWN");
if (!(*machine = uni_alloc (mach, wcslen (mach))))
{
cyglsa_printf ("No memory trying to create machine.\n");
return STATUS_NO_MEMORY;
}
}
/* Create a fake buffer in pbuf which is free'd again in the client.
Windows 2000 tends to crash when setting this pointer to NULL. */
if (pbuf)
{
#ifdef JUST_ANOTHER_NONWORKING_SOLUTION
cygprf_t prf;
WCHAR sam_username[MAX_DOMAIN_NAME_LEN + UNLEN + 2];
SECURITY_STRING sam_user, prefix;
PUCHAR user_auth;
ULONG user_auth_size;
WCHAR flatname[UNLEN + 1];
UNICODE_STRING flatnm;
TOKEN_SOURCE ts;
HANDLE token;
#endif /* JUST_ANOTHER_NONWORKING_SOLUTION */
stat = funcs->AllocateClientBuffer (request, 64UL, pbuf);
if (!LSA_SUCCESS (stat))
{
cyglsa_printf ("AllocateClientBuffer failed: 0x%08lx\n", stat);
return stat;
}
#ifdef JUST_ANOTHER_NONWORKING_SOLUTION
prf.magic_pre = MAGIC_PRE;
prf.token = NULL;
prf.magic_post = MAGIC_POST;
#if 0
/* That's how it was supposed to work according to MSDN... */
wcscpy (sam_username, authinf->domain);
wcscat (sam_username, L"\\");
wcscat (sam_username, authinf->username);
#else
/* That's the only solution which worked, and then it only worked
for machine local accounts. No domain authentication possible.
STATUS_NO_SUCH_USER galore! */
wcscpy (sam_username, authinf->username);
#endif
RtlInitUnicodeString (&sam_user, sam_username);
RtlInitUnicodeString (&prefix, L"");
RtlInitEmptyUnicodeString (&flatnm, flatname,
(UNLEN + 1) * sizeof (WCHAR));
stat = funcs->GetAuthDataForUser (&sam_user, SecNameSamCompatible,
NULL, &user_auth,
&user_auth_size, &flatnm);
if (!NT_SUCCESS (stat))
{
char sam_u[MAX_DOMAIN_NAME_LEN + UNLEN + 2];
wcstombs (sam_u, sam_user.Buffer, sizeof (sam_u));
cyglsa_printf ("GetAuthDataForUser (%u,%u,%s) failed: 0x%08lx\n",
sam_user.Length, sam_user.MaximumLength, sam_u, stat);
return stat;
}
memcpy (ts.SourceName, "Cygwin.1", 8);
ts.SourceIdentifier.HighPart = 0;
ts.SourceIdentifier.LowPart = 0x0104;
RtlInitEmptyUnicodeString (&flatnm, flatname,
(UNLEN + 1) * sizeof (WCHAR));
stat = funcs->ConvertAuthDataToToken (user_auth, user_auth_size,
SecurityDelegation, &ts,
Interactive, *authority,
&token, logon_id, &flatnm,
sub_stat);
if (!NT_SUCCESS (stat))
{
cyglsa_printf ("ConvertAuthDataToToken failed: 0x%08lx\n", stat);
return stat;
}
stat = funcs->DuplicateHandle (token, &prf.token);
if (!NT_SUCCESS (stat))
{
cyglsa_printf ("DuplicateHandle failed: 0x%08lx\n", stat);
return stat;
}
stat = funcs->CopyToClientBuffer (request, sizeof prf, *pbuf, &prf);
if (!NT_SUCCESS (stat))
{
cyglsa_printf ("CopyToClientBuffer failed: 0x%08lx\n", stat);
return stat;
}
funcs->FreeLsaHeap (user_auth);
#endif /* JUST_ANOTHER_NONWORKING_SOLUTION */
}
if (pbuf_len)
*pbuf_len = 64UL;
/* A PLSA_TOKEN_INFORMATION_V2 is allocated in one piece, so... */
#if defined (__x86_64__) || defined (_M_AMD64)
{
/* ...on 64 bit systems we have to convert the incoming 32 bit offsets
into 64 bit pointers. That requires to re-evaluate the size of the
outgoing tokinf structure and a somewhat awkward procedure to copy
the information over. */
LONG_PTR base;
PBYTE tptr;
DWORD size, newsize;
PSID src_sid;
PCYG_TOKEN_GROUPS src_grps;
PTOKEN_GROUPS grps;
PTOKEN_PRIVILEGES src_privs;
PACL src_acl;
base = (LONG_PTR) &authinf->inf;
newsize = authinf->inf_size;
newsize += sizeof (TOKEN_USER) - sizeof (CYG_TOKEN_USER); /* User SID */
newsize += sizeof (PTOKEN_GROUPS) - sizeof (OFFSET); /* Groups */
src_grps = (PCYG_TOKEN_GROUPS) (base + authinf->inf.Groups);
newsize += src_grps->GroupCount /* Group SIDs */
* (sizeof (SID_AND_ATTRIBUTES)
- sizeof (CYG_SID_AND_ATTRIBUTES));
newsize += sizeof (PSID) - sizeof (OFFSET); /* Primary Group SID */
newsize += sizeof (PTOKEN_PRIVILEGES) - sizeof (OFFSET); /* Privileges */
newsize += 0; /* Owner SID */
newsize += sizeof (PACL) - sizeof (OFFSET); /* Default DACL */
if (!(tokinf = funcs->AllocateLsaHeap (newsize)))
return STATUS_NO_MEMORY;
tptr = (PBYTE)(tokinf + 1);
tokinf->ExpirationTime = authinf->inf.ExpirationTime;
/* User SID */
src_sid = (PSID) (base + authinf->inf.User.User.Sid);
size = RtlLengthSid (src_sid);
RtlCopySid (size, (PSID) tptr, src_sid);
tokinf->User.User.Sid = (PSID) tptr;
tptr += size;
tokinf->User.User.Attributes = authinf->inf.User.User.Attributes;
/* Groups */
grps = (PTOKEN_GROUPS) tptr;
tokinf->Groups = grps;
grps->GroupCount = src_grps->GroupCount;
tptr += sizeof grps->GroupCount
+ grps->GroupCount * sizeof (SID_AND_ATTRIBUTES);
/* Group SIDs */
for (i = 0; i < src_grps->GroupCount; ++i)
{
src_sid = (PSID) (base + src_grps->Groups[i].Sid);
size = RtlLengthSid (src_sid);
RtlCopySid (size, (PSID) tptr, src_sid);
tokinf->Groups->Groups[i].Sid = (PSID) tptr;
tptr += size;
tokinf->Groups->Groups[i].Attributes = src_grps->Groups[i].Attributes;
}
/* Primary Group SID */
src_sid = (PSID) (base + authinf->inf.PrimaryGroup.PrimaryGroup);
size = RtlLengthSid (src_sid);
RtlCopySid (size, (PSID) tptr, src_sid);
tokinf->PrimaryGroup.PrimaryGroup = (PSID) tptr;
tptr += size;
/* Privileges */
src_privs = (PTOKEN_PRIVILEGES) (base + authinf->inf.Privileges);
size = sizeof src_privs->PrivilegeCount
+ src_privs->PrivilegeCount * sizeof (LUID_AND_ATTRIBUTES);
memcpy (tptr, src_privs, size);
tokinf->Privileges = (PTOKEN_PRIVILEGES) tptr;
tptr += size;
/* Owner */
tokinf->Owner.Owner = NULL;
/* Default DACL */
src_acl = (PACL) (base + authinf->inf.DefaultDacl.DefaultDacl);
size = src_acl->AclSize;
memcpy (tptr, src_acl, size);
tokinf->DefaultDacl.DefaultDacl = (PACL) tptr;
}
#else
{
/* ...on 32 bit systems we just allocate tokinf with the same size as
we get, copy the whole structure and convert offsets into pointers. */
/* Allocate LUID for usage in the logon SID on Windows 2000. This is
not done in the 64 bit code above for hopefully obvious reasons... */
LUID logon_sid_id;
if (must_create_logon_sid
&& !NT_SUCCESS (NtAllocateLocallyUniqueId (&logon_sid_id)))
return STATUS_INSUFFICIENT_RESOURCES;
if (!(tokinf = funcs->AllocateLsaHeap (authinf->inf_size)))
return STATUS_NO_MEMORY;
memcpy (tokinf, &authinf->inf, authinf->inf_size);
/* User SID */
tokinf->User.User.Sid = (PSID)
((PBYTE) tokinf + (LONG_PTR) tokinf->User.User.Sid);
/* Groups */
tokinf->Groups = (PTOKEN_GROUPS)
((PBYTE) tokinf + (LONG_PTR) tokinf->Groups);
/* Group SIDs */
for (i = 0; i < tokinf->Groups->GroupCount; ++i)
{
tokinf->Groups->Groups[i].Sid = (PSID)
((PBYTE) tokinf + (LONG_PTR) tokinf->Groups->Groups[i].Sid);
if (must_create_logon_sid
&& tokinf->Groups->Groups[i].Attributes & SE_GROUP_LOGON_ID
&& *RtlSubAuthorityCountSid (tokinf->Groups->Groups[i].Sid) == 3
&& *RtlSubAuthoritySid (tokinf->Groups->Groups[i].Sid, 0)
== SECURITY_LOGON_IDS_RID)
{
*RtlSubAuthoritySid (tokinf->Groups->Groups[i].Sid, 1)
= logon_sid_id.HighPart;
*RtlSubAuthoritySid (tokinf->Groups->Groups[i].Sid, 2)
= logon_sid_id.LowPart;
}
}
/* Primary Group SID */
tokinf->PrimaryGroup.PrimaryGroup = (PSID)
((PBYTE) tokinf + (LONG_PTR) tokinf->PrimaryGroup.PrimaryGroup);
/* Privileges */
tokinf->Privileges = (PTOKEN_PRIVILEGES)
((PBYTE) tokinf + (LONG_PTR) tokinf->Privileges);
/* Owner SID */
tokinf->Owner.Owner = NULL;
/* Default DACL */
tokinf->DefaultDacl.DefaultDacl = (PACL)
((PBYTE) tokinf + (LONG_PTR) tokinf->DefaultDacl.DefaultDacl);
}
#endif
*tok = (PVOID) tokinf;
*tok_type = LsaTokenInformationV2;
print_tokinf (tokinf, authinf->inf_size, authinf, &authinf->inf,
(PVOID)((LONG_PTR) &authinf->inf + authinf->inf_size));
/* Create logon session. */
stat = NtAllocateLocallyUniqueId (logon_id);
if (!NT_SUCCESS (stat))
{
funcs->FreeLsaHeap (*tok);
*tok = NULL;
cyglsa_printf ("NtAllocateLocallyUniqueId status 0x%08lx\n", stat);
return STATUS_INSUFFICIENT_RESOURCES;
}
stat = funcs->CreateLogonSession (logon_id);
if (stat != STATUS_SUCCESS)
{
funcs->FreeLsaHeap (*tok);
*tok = NULL;
cyglsa_printf ("CreateLogonSession failed: 0x%08lx\n", stat);
return stat;
}
cyglsa_printf ("BINGO!!!\n", stat);
return STATUS_SUCCESS;
}
VOID NTAPI
LsaApLogonTerminated(PLUID LogonId)
{
}
NTSTATUS NTAPI
LsaApCallPackage (PLSA_CLIENT_REQUEST request, PVOID authinf,
PVOID client_auth_base, ULONG auth_len, PVOID *ret_buf,
PULONG ret_buf_len, PNTSTATUS ret_stat)
{
return STATUS_NOT_IMPLEMENTED;
}
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