windows-nt/Source/XPSP1/NT/ds/win32/ntcrypto/rsaaes/protstor.cpp

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2020-09-26 03:20:57 -05:00
/////////////////////////////////////////////////////////////////////////////
// FILE : protstor.c //
// DESCRIPTION : Code for storing keys in the protected store: //
// AUTHOR : //
// HISTORY : //
// Dec 4 1996 jeffspel Created //
// Apr 21 1997 jeffspel Changes for NT 5 tree //
// Jul 28 1997 jeffspel Added ability to delete a persisted key //
// May 5 2000 dbarlow Modify error return handling //
// //
// Copyright (C) 1996 - 2000, Microsoft Corporation //
// All Rights Reserved //
/////////////////////////////////////////////////////////////////////////////
#include "precomp.h"
#include "wincrypt.h"
#include "pstore.h"
#include "protstor.h"
#include "ntagum.h"
#define CRYPTO_KEY_TYPE_STRING L"Cryptographic Keys"
static GUID l_DefTypeGuid
= { 0x4d1fa410, 0x6fd9, 0x11d0,
{ 0x8C, 0x58, 0x00, 0xC0, 0x4F, 0xD9, 0x12, 0x6B } };
#define CRYPTO_SIG_SUBTYPE_STRING L"RSA Signature Keys"
static GUID l_DefSigGuid
= { 0x4d1fa411, 0x6fd9, 0x11D0,
{ 0x8C, 0x58, 0x00, 0xC0, 0x4F, 0xD9, 0x12, 0x6B } };
#define CRYPTO_EXCH_SUBTYPE_STRING L"RSA Exchange Keys"
static GUID l_DefExchGuid
= { 0x4d1fa412, 0x6fd9, 0x11D0,
{ 0x8C, 0x58, 0x00, 0xC0, 0x4F, 0xD9, 0x12, 0x6B } };
static GUID l_SysProv = MS_BASE_PSTPROVIDER_ID;
void
FreePSInfo(
PSTORE_INFO *pPStore)
{
IPStore *pIPS;
if (NULL != pPStore)
{
pIPS = (IPStore*)pPStore->pProv;
if (NULL != pIPS)
pIPS->Release();
if (NULL != pPStore->hInst)
FreeLibrary(pPStore->hInst);
if (NULL != pPStore->szPrompt)
_nt_free(pPStore->szPrompt, pPStore->cbPrompt);
_nt_free(pPStore, sizeof(PSTORE_INFO));
}
}
BOOL
CheckPStoreAvailability(
PSTORE_INFO *pPStore)
{
BOOL fRet = FALSE;
if (S_OK != PStoreCreateInstance((IPStore**)(&pPStore->pProv),
&l_SysProv, NULL, 0))
goto ErrorExit;
memcpy(&pPStore->SigType, &l_DefTypeGuid, sizeof(GUID));
memcpy(&pPStore->SigSubtype, &l_DefSigGuid, sizeof(GUID));
memcpy(&pPStore->ExchType, &l_DefTypeGuid, sizeof(GUID));
memcpy(&pPStore->ExchSubtype, &l_DefExchGuid, sizeof(GUID));
fRet = TRUE;
ErrorExit:
return fRet;
}
DWORD
CreateNewPSKeyset(
PSTORE_INFO *pPStore,
DWORD dwFlags)
{
DWORD dwReturn = ERROR_INTERNAL_ERROR;
PST_ACCESSRULE rgRules[2];
PST_ACCESSRULESET Rules;
PST_TYPEINFO Info;
PST_PROMPTINFO PromptInfo = {NULL, NULL};
HRESULT hr;
IPStore *pIPS = (IPStore*)pPStore->pProv;
DWORD dwRegLoc = PST_KEY_CURRENT_USER;
if (dwFlags & CRYPT_MACHINE_KEYSET)
dwRegLoc = PST_KEY_LOCAL_MACHINE;
// if type is not available the create it
memset(&Info, 0, sizeof(Info));
Info.cbSize = sizeof(PST_TYPEINFO);
Info.szDisplayName = CRYPTO_KEY_TYPE_STRING;
hr = pIPS->CreateType(dwRegLoc, &pPStore->SigType, &Info, 0);
if ((S_OK != hr) && (PST_E_TYPE_EXISTS != hr))
{
dwReturn = (DWORD)hr;
goto ErrorExit;
}
// make same rules for read, write access
rgRules[0].cbSize = sizeof(PST_ACCESSRULE);
rgRules[0].AccessModeFlags = PST_READ;
rgRules[0].cClauses = 0;
rgRules[0].rgClauses = NULL;
rgRules[1].cbSize = sizeof(PST_ACCESSRULE);
rgRules[1].AccessModeFlags = PST_WRITE;
rgRules[1].cClauses = 0;
rgRules[1].rgClauses = NULL;
Rules.cbSize = sizeof(PST_ACCESSRULESET);
Rules.cRules = 2;
Rules.rgRules = rgRules;
// create the signature subtype
Info.szDisplayName = CRYPTO_SIG_SUBTYPE_STRING;
PromptInfo.szPrompt = L"";
hr = pIPS->CreateSubtype(dwRegLoc, &pPStore->SigType,
&pPStore->SigSubtype, &Info, &Rules, 0);
if ((S_OK != hr) && (PST_E_TYPE_EXISTS != hr))
{
dwReturn = (DWORD)hr;
goto ErrorExit;
}
// create the exchange subtype
Info.szDisplayName = CRYPTO_EXCH_SUBTYPE_STRING;
hr = pIPS->CreateSubtype(dwRegLoc, &pPStore->SigType,
&pPStore->ExchSubtype, &Info, &Rules, 0);
if ((S_OK != hr) && (PST_E_TYPE_EXISTS != hr))
{
dwReturn = (DWORD)hr;
goto ErrorExit;
}
dwReturn = ERROR_SUCCESS;
ErrorExit:
return dwReturn;
}
DWORD
GetKeysetTypeAndSubType(
PNTAGUserList pUser)
{
DWORD dwReturn = ERROR_INTERNAL_ERROR;
BYTE *pb1 = NULL;
DWORD cb1;
BYTE *pb2 = NULL;
DWORD cb2;
DWORD dwSts;
memcpy(&pUser->pPStore->SigType, &l_DefTypeGuid, sizeof(GUID));
memcpy(&pUser->pPStore->SigSubtype, &l_DefSigGuid, sizeof(GUID));
memcpy(&pUser->pPStore->ExchType, &l_DefTypeGuid, sizeof(GUID));
memcpy(&pUser->pPStore->ExchSubtype, &l_DefExchGuid, sizeof(GUID));
// look in registry and see if the type and subtype Guids are there
dwSts = ReadRegValue(pUser->hKeys, "SigTypeSubtype", &pb1, &cb1, TRUE);
if (ERROR_SUCCESS != dwSts)
{
dwReturn = dwSts;
goto ErrorExit;
}
dwSts = ReadRegValue(pUser->hKeys, "ExchTypeSubtype", &pb2, &cb2, TRUE);
if (ERROR_SUCCESS != dwSts)
{
dwReturn = dwSts;
goto ErrorExit;
}
if (pb1)
{
memcpy(&pUser->pPStore->SigType, pb1, sizeof(GUID));
memcpy(&pUser->pPStore->SigSubtype, pb1 + sizeof(GUID), sizeof(GUID));
}
if (pb2)
{
memcpy(&pUser->pPStore->ExchType, pb2, sizeof(GUID));
memcpy(&pUser->pPStore->ExchSubtype, pb2 + sizeof(GUID), sizeof(GUID));
}
dwReturn = ERROR_SUCCESS;
ErrorExit:
if (pb1)
_nt_free(pb1, cb1);
if (pb2)
_nt_free(pb2, cb2);
return dwReturn;
}
DWORD
SetUIPrompt(
PNTAGUserList pUser,
LPWSTR szPrompt)
{
DWORD dwReturn = ERROR_INTERNAL_ERROR;
DWORD cb = 0;
LPWSTR sz = NULL;
// check if sig or exch keys are loaded and if so error
if (NULL == pUser->pPStore)
{
dwReturn = (DWORD)NTE_BAD_KEYSET;
goto ErrorExit;
}
if (NULL != szPrompt)
{
cb = (lstrlenW(szPrompt) + 1) * sizeof(WCHAR);
sz = (LPWSTR)_nt_malloc(cb);
if (NULL == sz)
{
dwReturn = ERROR_NOT_ENOUGH_MEMORY;
goto ErrorExit;
}
lstrcpyW(sz, szPrompt);
}
if (pUser->pPStore->szPrompt)
_nt_free(pUser->pPStore->szPrompt, pUser->pPStore->cbPrompt);
pUser->pPStore->cbPrompt = cb;
pUser->pPStore->szPrompt = sz;
dwReturn = ERROR_SUCCESS;
ErrorExit:
return dwReturn;
}
/*static*/ DWORD
PickleKey(
BOOL fExportable,
size_t cbPriv,
PBYTE pbPriv,
PBYTE *ppbData,
PDWORD pcbData)
{
DWORD dwReturn = ERROR_INTERNAL_ERROR;
if (NULL != pbPriv)
{
// alloc the appropriate amount of space
*pcbData = cbPriv + sizeof(DWORD) + sizeof(BOOL);
*ppbData = (PBYTE)_nt_malloc(*pcbData);
if (NULL == *ppbData)
{
dwReturn = ERROR_NOT_ENOUGH_MEMORY;
goto ErrorExit;
}
// copy exportable info into buffer
memcpy(*ppbData, &fExportable, sizeof(BOOL));
// copy length of keying material into buffer
memcpy(*ppbData + sizeof(BOOL), &cbPriv, sizeof(DWORD));
// copy keying material into buffer
memcpy(*ppbData + sizeof(DWORD) + sizeof(BOOL), pbPriv, cbPriv);
}
dwReturn = ERROR_SUCCESS;
ErrorExit:
return dwReturn;
}
/*static*/ DWORD
UnpickleKey(
PBYTE pbData,
BOOL *pfExportable,
DWORD *pcbPriv,
PBYTE *ppbPriv)
{
DWORD dwReturn = ERROR_INTERNAL_ERROR;
if (NULL != pbData)
{
// pull out the exportable info
memcpy(pfExportable, pbData, sizeof(BOOL));
// pull out the length of the key material
memcpy(pcbPriv, pbData + sizeof(BOOL), sizeof(DWORD));
// free the current key material memory
if (NULL != *ppbPriv)
_nt_free(*ppbPriv, *pcbPriv);
// alloc new memory for the key material
*ppbPriv = (PBYTE)_nt_malloc(*pcbPriv);
if (NULL == *ppbPriv)
{
dwReturn = ERROR_NOT_ENOUGH_MEMORY;
goto ErrorExit;
}
// copy key material
memcpy(*ppbPriv, pbData + sizeof(DWORD) + sizeof(BOOL), *pcbPriv);
}
dwReturn = ERROR_SUCCESS;
ErrorExit:
return dwReturn;
}
/*static*/ DWORD
RestoreKeyFromProtectedStorage(
PNTAGUserList pUser,
LPWSTR szKeyName,
BYTE **ppbKey,
DWORD *pcbKey,
LPWSTR szPrompt,
BOOL fSigKey,
BOOL fMachineKeySet,
BOOL *pfUIOnKey)
{
DWORD dwReturn = ERROR_INTERNAL_ERROR;
HRESULT hr;
DWORD cb;
BYTE *pb = NULL;
GUID *pType;
GUID *pSubtype;
BOOL *pf;
PST_PROMPTINFO PromptInfo;
IPStore *pIPS = (IPStore*)(pUser->pPStore->pProv);
DWORD dwRegLoc = PST_KEY_CURRENT_USER;
DWORD dwSts;
*pfUIOnKey = FALSE;
if (fMachineKeySet)
dwRegLoc = PST_KEY_LOCAL_MACHINE;
memset(&PromptInfo, 0, sizeof(PromptInfo));
PromptInfo.cbSize = sizeof(PST_PROMPTINFO);
if (fSigKey)
{
if (0 == pUser->ContInfo.ContLens.cbSigPub)
{
dwReturn = ERROR_SUCCESS;
goto ErrorExit;
}
pType = &pUser->pPStore->SigType;
pSubtype = &pUser->pPStore->SigSubtype;
pf = &pUser->ContInfo.fSigExportable;
}
else
{
if (0 == pUser->ContInfo.ContLens.cbExchPub)
{
dwReturn = ERROR_SUCCESS;
goto ErrorExit;
}
pType = &pUser->pPStore->ExchType;
pSubtype = &pUser->pPStore->ExchSubtype;
pf = &pUser->ContInfo.fExchExportable;
}
// read the item from secure storage
PromptInfo.hwndApp = NULL;
if (NULL == pUser->pPStore->szPrompt)
PromptInfo.szPrompt = szPrompt;
else
PromptInfo.szPrompt = pUser->pPStore->szPrompt;
hr = pIPS->ReadItem(dwRegLoc, pType, pSubtype, szKeyName, &cb,
&pb, &PromptInfo,
PST_PROMPT_QUERY | PST_NO_UI_MIGRATION);
if (S_OK != hr)
{
// this function returns PST_E_ITEM_EXISTS if there is UI on the item
if (PST_E_ITEM_EXISTS == hr)
*pfUIOnKey = TRUE;
else
{
dwReturn = (DWORD)hr;
goto ErrorExit;
}
}
dwSts = UnpickleKey(pb, pf, pcbKey, ppbKey);
if (ERROR_SUCCESS != dwSts)
{
dwReturn = dwSts;
goto ErrorExit;
}
dwReturn = ERROR_SUCCESS;
ErrorExit:
if (pb)
CoTaskMemFree(pb);
return dwReturn;
}
/*static*/ DWORD
MakeUnicodeKeysetName(
BYTE *pszName,
LPWSTR *ppszWName)
{
// ?BUGBUG? -- We don't really do this, do we?
DWORD dwReturn = ERROR_INTERNAL_ERROR;
long i;
DWORD cb;
cb = (DWORD)lstrlenA((LPSTR)pszName);
*ppszWName = (LPWSTR)_nt_malloc((cb + 1) * sizeof(WCHAR));
if (NULL == *ppszWName)
{
dwReturn = ERROR_NOT_ENOUGH_MEMORY;
goto ErrorExit;
}
for (i=0;i<(long)cb;i++)
(*ppszWName)[i] = (WCHAR)(pszName[i]);
dwReturn = ERROR_SUCCESS;
ErrorExit:
return dwReturn;
}
DWORD
RestoreKeysetFromProtectedStorage(
PNTAGUserList pUser,
LPWSTR szPrompt,
BYTE **ppbKey,
DWORD *pcbKey,
BOOL fSigKey,
BOOL fMachineKeySet,
BOOL *pfUIOnKey)
{
DWORD dwReturn = ERROR_INTERNAL_ERROR;
LPWSTR pszWName = NULL;
DWORD dwSts;
// convert the keyset name to unicode
dwSts = MakeUnicodeKeysetName((BYTE*)pUser->ContInfo.pszUserName,
&pszWName);
if (ERROR_SUCCESS != dwSts)
{
dwReturn = dwSts;
goto ErrorExit;
}
// restore the signature key
dwSts = RestoreKeyFromProtectedStorage(pUser, pszWName, ppbKey, pcbKey,
szPrompt, fSigKey, fMachineKeySet,
pfUIOnKey);
if (ERROR_SUCCESS != dwSts)
{
dwReturn = dwSts;
goto ErrorExit;
}
dwReturn = ERROR_SUCCESS;
ErrorExit:
if (pszWName)
_nt_free(pszWName, (wcslen(pszWName) + 1) * sizeof(WCHAR));
return dwReturn;
}
void
RemoveKeysetFromMemory(
PNTAGUserList pUser)
{
pUser->ContInfo.fSigExportable = FALSE;
if (pUser->pSigPrivKey)
{
_nt_free(pUser->pSigPrivKey, pUser->SigPrivLen);
pUser->SigPrivLen = 0;
pUser->pSigPrivKey = NULL;
}
pUser->ContInfo.fExchExportable = FALSE;
if (pUser->pExchPrivKey)
{
_nt_free(pUser->pExchPrivKey, pUser->ExchPrivLen);
pUser->ExchPrivLen = 0;
pUser->pExchPrivKey = NULL;
}
}
DWORD
SaveKeyToProtectedStorage(
PNTAGUserList pUser,
DWORD dwFlags,
LPWSTR szPrompt,
BOOL fSigKey,
BOOL fMachineKeySet)
{
DWORD dwReturn = ERROR_INTERNAL_ERROR;
HRESULT hr;
PBYTE pb = NULL;
DWORD cb;
GUID *pType;
GUID *pSubtype;
BOOL f;
BYTE *pbKey = NULL;
size_t cbKey;
LPWSTR pszWName = NULL;
LPSTR szKeyName;
PST_PROMPTINFO PromptInfo;
IPStore *pIPS = (IPStore*)(pUser->pPStore->pProv);
DWORD dwRegLoc = PST_KEY_CURRENT_USER;
DWORD dwConfirm = PST_CF_NONE;
DWORD dwSts;
if (fMachineKeySet)
dwRegLoc = PST_KEY_LOCAL_MACHINE;
memset(&PromptInfo, 0, sizeof(PromptInfo));
PromptInfo.cbSize = sizeof(PST_PROMPTINFO);
if (fSigKey)
{
pType = &pUser->pPStore->SigType;
pSubtype = &pUser->pPStore->SigSubtype;
f = pUser->ContInfo.fSigExportable;
cbKey = pUser->SigPrivLen;
pbKey = pUser->pSigPrivKey;
szKeyName = "SPbK";
if (dwFlags & CRYPT_USER_PROTECTED)
dwConfirm = PST_CF_DEFAULT;
}
else
{
pType = &pUser->pPStore->ExchType;
pSubtype = &pUser->pPStore->ExchSubtype;
f = pUser->ContInfo.fExchExportable;
cbKey = pUser->ExchPrivLen;
pbKey = pUser->pExchPrivKey;
szKeyName = "EPbK";
if (dwFlags & CRYPT_USER_PROTECTED)
dwConfirm = PST_CF_DEFAULT;
}
// format the signature key and exportable info
dwSts = PickleKey(f, cbKey, pbKey, &pb, &cb);
if (ERROR_SUCCESS != dwSts)
{
dwReturn = dwSts;
goto ErrorExit;
}
if (pb)
{
// make a unicode version of the keyset name
dwSts = MakeUnicodeKeysetName((BYTE*)pUser->ContInfo.pszUserName,
&pszWName);
if (ERROR_SUCCESS != dwSts)
{
dwReturn = dwSts;
goto ErrorExit;
}
PromptInfo.hwndApp = NULL;
if (NULL == pUser->pPStore->szPrompt)
PromptInfo.szPrompt = szPrompt;
else
PromptInfo.szPrompt = pUser->pPStore->szPrompt;
hr = pIPS->WriteItem(dwRegLoc, pType, pSubtype, pszWName,
cb, pb, &PromptInfo, dwConfirm, 0);
if (S_OK != hr)
{
dwReturn = (DWORD)hr;
goto ErrorExit;
}
}
dwReturn = ERROR_SUCCESS;
ErrorExit:
if (pb)
_nt_free(pb, cb);
if (pszWName)
_nt_free(pszWName, (wcslen(pszWName) + 1) * sizeof(WCHAR));
return dwReturn;
}
DWORD
DeleteKeyFromProtectedStorage(
NTAGUserList *pUser,
PCSP_STRINGS pStrings,
DWORD dwKeySpec,
BOOL fMachineKeySet,
BOOL fMigration)
{
DWORD dwReturn = ERROR_INTERNAL_ERROR;
LPWSTR szWUserName = NULL;
PST_PROMPTINFO PromptInfo;
IPStore *pIPS;
DWORD dwRegLoc = PST_KEY_CURRENT_USER;
DWORD dwSts;
memset(&PromptInfo, 0, sizeof(PromptInfo));
PromptInfo.cbSize = sizeof(PST_PROMPTINFO);
PromptInfo.hwndApp = NULL;
if (fMachineKeySet)
dwRegLoc = PST_KEY_LOCAL_MACHINE;
// make a unicode name
dwSts = MakeUnicodeKeysetName((BYTE*)pUser->ContInfo.pszUserName,
&szWUserName);
if (ERROR_SUCCESS != dwSts)
{
dwReturn = dwSts;
goto ErrorExit;
}
pIPS = (IPStore*)(pUser->pPStore->pProv);
if (AT_SIGNATURE == dwKeySpec)
{
if (fMigration)
PromptInfo.szPrompt = pStrings->pwszDeleteMigrSig;
else
PromptInfo.szPrompt = pStrings->pwszDeleteSig;
pIPS->DeleteItem(dwRegLoc,
&pUser->pPStore->SigType,
&pUser->pPStore->SigSubtype,
szWUserName,
&PromptInfo,
PST_NO_UI_MIGRATION);
}
else
{
if (fMigration)
PromptInfo.szPrompt = pStrings->pwszDeleteMigrExch;
else
PromptInfo.szPrompt = pStrings->pwszDeleteExch;
pIPS->DeleteItem(dwRegLoc,
&pUser->pPStore->ExchType,
&pUser->pPStore->ExchSubtype,
szWUserName,
&PromptInfo,
PST_NO_UI_MIGRATION);
}
dwReturn = ERROR_SUCCESS;
ErrorExit:
if (szWUserName)
_nt_free(szWUserName, (wcslen(szWUserName) + 1) * sizeof(WCHAR));
return dwReturn;
}
DWORD
DeleteFromProtectedStorage(
CONST char *pszUserID,
PCSP_STRINGS pStrings,
HKEY hRegKey,
BOOL fMachineKeySet)
{
DWORD dwReturn = ERROR_INTERNAL_ERROR;
NTAGUserList User;
DWORD dwSts;
// set up the User List structure
memset(&User, 0, sizeof(User));
User.ContInfo.pszUserName = (LPSTR)pszUserID;
User.hKeys = hRegKey;
User.pPStore = (PSTORE_INFO*)_nt_malloc(sizeof(PSTORE_INFO));
if (NULL == User.pPStore)
{
dwReturn = ERROR_NOT_ENOUGH_MEMORY;
goto ErrorExit;
}
if (!CheckPStoreAvailability(User.pPStore))
{
dwReturn = (DWORD)NTE_FAIL;
goto ErrorExit;
}
// get type and subtypes
dwSts = GetKeysetTypeAndSubType(&User);
if (ERROR_SUCCESS != dwSts)
{
dwReturn = dwSts;
goto ErrorExit;
}
// delete each key
dwSts = DeleteKeyFromProtectedStorage(&User, pStrings, AT_SIGNATURE,
fMachineKeySet, FALSE);
if (ERROR_SUCCESS != dwSts)
{
dwReturn = dwSts;
goto ErrorExit;
}
dwSts = DeleteKeyFromProtectedStorage(&User, pStrings, AT_KEYEXCHANGE,
fMachineKeySet, FALSE);
if (ERROR_SUCCESS != dwSts)
{
dwReturn = dwSts;
goto ErrorExit;
}
dwReturn = ERROR_SUCCESS;
ErrorExit:
if (User.pPStore)
FreePSInfo(User.pPStore);
return dwReturn;
}