424 lines
11 KiB
C++
424 lines
11 KiB
C++
#include "global.h"
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//+-------------------------------------------------------------------------
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// Private Key file definitions
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//
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// The file consists of the FILE_HDR followed by cbEncryptData optional
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// bytes used to encrypt the private key and then the private key.
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// The private key is encrypted according to dwEncryptType.
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//
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// The public key is included with the private key.
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//--------------------------------------------------------------------------
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typedef struct _FILE_HDR {
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DWORD dwMagic;
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DWORD dwVersion;
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DWORD dwKeySpec;
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DWORD dwEncryptType;
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DWORD cbEncryptData;
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DWORD cbPvk;
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} FILE_HDR, *PFILE_HDR;
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// BUGBUG: enum from pvk.h?
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#ifndef ENTER_PASSWORD
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#define ENTER_PASSWORD 0
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#endif // ENTER_PASSWORD
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#define PVK_FILE_VERSION_0 0
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#define PVK_MAGIC 0xb0b5f11e
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// Private key encrypt types
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#define PVK_NO_ENCRYPT 0
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#define MAX_PVK_FILE_LEN 4096
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typedef BOOL (* PFNREAD)(HANDLE h, void * p, DWORD cb);
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extern DWORD g_dwSubjectStoreFlag;
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//+-------------------------------------------------------------------------
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// Read & Write to memory fucntion
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//--------------------------------------------------------------------------
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typedef struct _MEMINFO {
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BYTE * pb;
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DWORD cb;
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DWORD cbSeek;
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} MEMINFO, * PMEMINFO;
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static BOOL ReadFromMemory(
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IN HANDLE h,
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IN void * p,
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IN DWORD cb
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)
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{
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PMEMINFO pMemInfo = (PMEMINFO) h;
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if (pMemInfo->cbSeek + cb <= pMemInfo->cb) {
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// copy the bytes
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memcpy(p, &pMemInfo->pb[pMemInfo->cbSeek], cb);
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pMemInfo->cbSeek += cb;
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return TRUE;
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} else {
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SetLastError(ERROR_END_OF_MEDIA);
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return FALSE;
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}
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}
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//+-------------------------------------------------------------------------
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// Converts the bytes into WCHAR hex
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//
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// Needs (cb * 2 + 1) * sizeof(WCHAR) bytes of space in wsz
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//--------------------------------------------------------------------------
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static void BytesToWStr(ULONG cb, void* pv, LPWSTR wsz)
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{
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BYTE* pb = (BYTE*) pv;
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for (ULONG i = 0; i<cb; i++) {
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int b;
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b = (*pb & 0xF0) >> 4;
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*wsz++ = (b <= 9) ? b + L'0' : (b - 10) + L'A';
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b = *pb & 0x0F;
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*wsz++ = (b <= 9) ? b + L'0' : (b - 10) + L'A';
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pb++;
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}
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*wsz++ = 0;
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}
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#define UUID_WSTR_BYTES ((sizeof(GUID) * 2 + 1) * sizeof(WCHAR))
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//-------------------------------------------------------------------------
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//
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// Call GetLastError and convert the return code to HRESULT
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//--------------------------------------------------------------------------
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HRESULT WINAPI SignError ()
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{
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DWORD dw = GetLastError ();
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HRESULT hr;
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if ( dw <= (DWORD) 0xFFFF )
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hr = HRESULT_FROM_WIN32 ( dw );
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else
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hr = dw;
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if ( ! FAILED ( hr ) )
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{
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// somebody failed a call without properly setting an error condition
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hr = E_UNEXPECTED;
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}
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return hr;
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}
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static BOOL LoadKeyW(
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IN HCRYPTPROV hCryptProv,
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IN HANDLE hRead,
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IN PFNREAD pfnRead,
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IN DWORD cbKeyData,
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IN HWND hwndOwner,
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IN LPCWSTR pwszKeyName,
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IN DWORD dwFlags,
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IN OUT OPTIONAL DWORD *pdwKeySpec
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)
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{
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BOOL fResult;
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FILE_HDR Hdr;
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HCRYPTKEY hKey = 0;
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BYTE *pbPvk = NULL;
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DWORD cbPvk;
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// Read the file header and verify
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if (!pfnRead(hRead, &Hdr, sizeof(Hdr)))
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{
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ERROR_OUT(("can't read in-memory pvk file hdr"));
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goto BadPvkFile;
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}
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ASSERT( Hdr.dwMagic == PVK_MAGIC );
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// Treat as a "normal" private key file
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cbPvk = Hdr.cbPvk;
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if (Hdr.dwVersion != PVK_FILE_VERSION_0 ||
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Hdr.cbEncryptData > MAX_PVK_FILE_LEN ||
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cbPvk == 0 || cbPvk > MAX_PVK_FILE_LEN)
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goto BadPvkFile;
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if (pdwKeySpec) {
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DWORD dwKeySpec = *pdwKeySpec;
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*pdwKeySpec = Hdr.dwKeySpec;
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if (dwKeySpec && dwKeySpec != Hdr.dwKeySpec) {
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SetLastError(PVK_HELPER_WRONG_KEY_TYPE);
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goto ErrorReturn;
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}
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}
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// Allocate and read the private key
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if (NULL == (pbPvk = new BYTE[cbPvk]))
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goto ErrorReturn;
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if (!pfnRead(hRead, pbPvk, cbPvk))
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goto BadPvkFile;
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ASSERT(Hdr.dwEncryptType == PVK_NO_ENCRYPT);
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// Decrypt and import the private key
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if (!CryptImportKey(hCryptProv, pbPvk, cbPvk, 0, dwFlags,
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&hKey))
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goto ErrorReturn;
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fResult = TRUE;
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goto CommonReturn;
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BadPvkFile:
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SetLastError(PVK_HELPER_BAD_PVK_FILE);
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if (pdwKeySpec)
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*pdwKeySpec = 0;
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ErrorReturn:
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fResult = FALSE;
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CommonReturn:
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if (pbPvk)
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delete (pbPvk);
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if (hKey)
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CryptDestroyKey(hKey);
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return fResult;
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}
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static BOOL AcquireKeyContextW(
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IN LPCWSTR pwszProvName,
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IN DWORD dwProvType,
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IN HANDLE hRead,
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IN PFNREAD pfnRead,
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IN DWORD cbKeyData,
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IN HWND hwndOwner,
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IN LPCWSTR pwszKeyName,
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IN OUT OPTIONAL DWORD *pdwKeySpec,
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OUT HCRYPTPROV *phCryptProv
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)
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{
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BOOL fResult;
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HCRYPTPROV hProv = 0;
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GUID TmpContainerUuid;
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LPWSTR pwszTmpContainer = NULL;
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// Create a temporary keyset to load the private key into
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// UuidCreate(&TmpContainerUuid);
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if (CoCreateGuid((GUID *)&TmpContainerUuid) != S_OK)
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{
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goto ErrorReturn;
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}
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if (NULL == (pwszTmpContainer = (LPWSTR) new BYTE[
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6 * sizeof(WCHAR) + UUID_WSTR_BYTES]))
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goto ErrorReturn;
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LStrCpyW(pwszTmpContainer, L"TmpKey");
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BytesToWStr(sizeof(UUID), &TmpContainerUuid, pwszTmpContainer + 6);
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if (!CryptAcquireContextU(
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&hProv,
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pwszTmpContainer,
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pwszProvName,
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dwProvType,
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CRYPT_NEWKEYSET |
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( g_dwSubjectStoreFlag == CERT_SYSTEM_STORE_LOCAL_MACHINE ?
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CRYPT_MACHINE_KEYSET : 0 )))
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goto ErrorReturn;
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if (!LoadKeyW(
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hProv,
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hRead,
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pfnRead,
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cbKeyData,
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hwndOwner,
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pwszKeyName,
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0, // dwFlags
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pdwKeySpec
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))
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goto DeleteKeySetReturn;
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fResult = TRUE;
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goto CommonReturn;
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DeleteKeySetReturn:
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CryptReleaseContext(hProv, 0);
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CryptAcquireContextU(
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&hProv,
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pwszTmpContainer,
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pwszProvName,
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dwProvType,
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CRYPT_DELETEKEYSET
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);
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hProv = 0;
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ErrorReturn:
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if (hProv) {
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CryptReleaseContext(hProv, 0);
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hProv = 0;
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}
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fResult = FALSE;
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CommonReturn:
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if (pwszTmpContainer) {
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delete (pwszTmpContainer);
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}
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*phCryptProv = hProv;
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return fResult;
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}
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//+-------------------------------------------------------------------------
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// Creates a temporary container in the provider and loads the private key
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// from memory.
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// For success, returns a handle to a cryptographic provider for the private
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// key and the name of the temporary container. PrivateKeyReleaseContext must
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// be called to release the hCryptProv and delete the temporary container.
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//
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// PrivateKeyLoadFromMemory is called to load the private key into the
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// temporary container.
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//--------------------------------------------------------------------------
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BOOL
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WINAPI
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PvkPrivateKeyAcquireContextFromMemory(
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IN LPCWSTR pwszProvName,
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IN DWORD dwProvType,
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IN BYTE *pbData,
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IN DWORD cbData,
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IN HWND hwndOwner,
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IN LPCWSTR pwszKeyName,
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IN OUT OPTIONAL DWORD *pdwKeySpec,
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OUT HCRYPTPROV *phCryptProv
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)
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{
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HRESULT hr = S_OK;
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if(FAILED(hr))
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return FALSE;
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MEMINFO MemInfo;
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MemInfo.pb = pbData;
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MemInfo.cb = cbData;
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MemInfo.cbSeek = 0;
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BOOL fhr = AcquireKeyContextW(
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pwszProvName,
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dwProvType,
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(HANDLE) &MemInfo,
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ReadFromMemory,
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cbData,
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hwndOwner,
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pwszKeyName,
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pdwKeySpec,
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phCryptProv
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);
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return fhr;
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}
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//+-------------------------------------------------------------------------
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// Releases the cryptographic provider and deletes the temporary container
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// created by PrivateKeyAcquireContext or PrivateKeyAcquireContextFromMemory.
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//--------------------------------------------------------------------------
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BOOL
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WINAPI
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PvkPrivateKeyReleaseContext(
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IN HCRYPTPROV hCryptProv,
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IN LPCWSTR pwszProvName,
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IN DWORD dwProvType,
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IN LPWSTR pwszTmpContainer
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)
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{
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HRESULT hr = S_OK;
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if (hCryptProv)
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CryptReleaseContext(hCryptProv, 0);
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if (pwszTmpContainer) {
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// Delete the temporary container for the private key from
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// the provider
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//
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// Note: for CRYPT_DELETEKEYSET, the returned hCryptProv is undefined
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// and must not be released.
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CryptAcquireContextU(
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&hCryptProv,
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pwszTmpContainer,
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pwszProvName,
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dwProvType,
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CRYPT_DELETEKEYSET
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);
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delete (pwszTmpContainer);
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}
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return TRUE;
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}
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//+-------------------------------------------------------------------------
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// Get crypto provider to based on either the pvkfile or key container name
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//--------------------------------------------------------------------------
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HRESULT WINAPI PvkGetCryptProv( IN HWND hwnd,
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IN LPCWSTR pwszCaption,
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IN LPCWSTR pwszCapiProvider,
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IN DWORD dwProviderType,
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IN LPCWSTR pwszPvkFile,
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IN LPCWSTR pwszKeyContainerName,
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IN DWORD *pdwKeySpec,
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OUT LPWSTR *ppwszTmpContainer,
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OUT HCRYPTPROV *phCryptProv)
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{
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HANDLE hFile=NULL;
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HRESULT hr=E_FAIL;
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DWORD dwRequiredKeySpec=0;
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//Init
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*ppwszTmpContainer=NULL;
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*phCryptProv=NULL;
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//get the provider handle based on the key container name
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if(!CryptAcquireContextU(phCryptProv,
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pwszKeyContainerName,
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pwszCapiProvider,
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dwProviderType,
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( g_dwSubjectStoreFlag == CERT_SYSTEM_STORE_LOCAL_MACHINE ?
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CRYPT_MACHINE_KEYSET : 0 )))
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return SignError();
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dwRequiredKeySpec=*pdwKeySpec;
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//make sure *pdwKeySpec is the correct key spec
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HCRYPTKEY hPubKey;
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if (CryptGetUserKey(
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*phCryptProv,
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dwRequiredKeySpec,
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&hPubKey
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))
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{
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CryptDestroyKey(hPubKey);
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*pdwKeySpec=dwRequiredKeySpec;
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return S_OK;
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}
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else
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{
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// Doesn't have the specified public key
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hr=SignError();
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CryptReleaseContext(*phCryptProv, 0);
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*phCryptProv=NULL;
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return hr;
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}
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}
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void WINAPI PvkFreeCryptProv(IN HCRYPTPROV hProv,
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IN LPCWSTR pwszCapiProvider,
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IN DWORD dwProviderType,
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IN LPWSTR pwszTmpContainer)
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{
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if (pwszTmpContainer) {
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// Delete the temporary container for the private key from
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// the provider
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PvkPrivateKeyReleaseContext(hProv,
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pwszCapiProvider,
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dwProviderType,
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pwszTmpContainer);
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} else {
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if (hProv)
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CryptReleaseContext(hProv, 0);
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}
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}
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