GateKeeper.cpp
author Markus Schaber <markus@pep-security.net>
Tue, 04 Oct 2016 23:07:42 +0200
branchkeysync
changeset 178 9f30e2a5f72c
parent 144 18208f2ec0bf
child 198 f317fa016c94
permissions -rw-r--r--
COM-30 COM-24: Refactorings
Drop unused enum.
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#include "stdafx.h"
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#include "GateKeeper.h"
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#include "pEpCOMServerAdapter.h"
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#include "utf8_helper.h"
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using namespace std;
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// from https://msdn.microsoft.com/en-us/library/windows/desktop/dd388945(v=vs.85).aspx
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struct PUBLIC_KEY_VALUES {
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    BLOBHEADER blobheader;
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    RSAPUBKEY rsapubkey;
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    BYTE modulus[4096];
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};
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static void ReverseMemCopy(
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    _Out_ BYTE       *pbDest,
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    _In_  BYTE const *pbSource,
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    _In_  DWORD       cb
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    )
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{
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    for (DWORD i = 0; i < cb; i++) {
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        pbDest[cb - 1 - i] = pbSource[i];
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    }
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}
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static NTSTATUS ImportRsaPublicKey(
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    _In_ BCRYPT_ALG_HANDLE  hAlg,    // CNG provider
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    _In_ PUBLIC_KEY_VALUES *pKey,    // Pointer to the RSAPUBKEY blob.
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    _In_ BCRYPT_KEY_HANDLE *phKey    // Receives a handle the imported public key.
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    )
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{
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    NTSTATUS hr = 0;
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    BYTE *pbPublicKey = NULL;
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    DWORD cbKey = 0;
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    // Layout of the RSA public key blob:
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    //  +----------------------------------------------------------------+
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    //  |     BCRYPT_RSAKEY_BLOB    | BE( dwExp ) |   BE( Modulus )      |
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    //  +----------------------------------------------------------------+
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    //
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    //  sizeof(BCRYPT_RSAKEY_BLOB)       cbExp           cbModulus 
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    //  <--------------------------><------------><---------------------->
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    //
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    //   BE = Big Endian Format                                                     
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    DWORD cbModulus = (pKey->rsapubkey.bitlen + 7) / 8;
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    DWORD dwExp = pKey->rsapubkey.pubexp;
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    DWORD cbExp = (dwExp & 0xFF000000) ? 4 :
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        (dwExp & 0x00FF0000) ? 3 :
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        (dwExp & 0x0000FF00) ? 2 : 1;
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    BCRYPT_RSAKEY_BLOB *pRsaBlob;
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    PBYTE pbCurrent;
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    if (!SUCCEEDED(hr = DWordAdd(cbModulus, sizeof(BCRYPT_RSAKEY_BLOB), &cbKey))) {
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        goto cleanup;
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    }
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    cbKey += cbExp;
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    pbPublicKey = (PBYTE) CoTaskMemAlloc(cbKey);
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    if (pbPublicKey == NULL) {
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        hr = E_OUTOFMEMORY;
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        goto cleanup;
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    }
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    ZeroMemory(pbPublicKey, cbKey);
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    pRsaBlob = (BCRYPT_RSAKEY_BLOB *) (pbPublicKey);
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    //
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    // Make the Public Key Blob Header
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    //
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    pRsaBlob->Magic = BCRYPT_RSAPUBLIC_MAGIC;
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    pRsaBlob->BitLength = pKey->rsapubkey.bitlen;
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    pRsaBlob->cbPublicExp = cbExp;
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    pRsaBlob->cbModulus = cbModulus;
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    pRsaBlob->cbPrime1 = 0;
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    pRsaBlob->cbPrime2 = 0;
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    pbCurrent = (PBYTE) (pRsaBlob + 1);
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    //
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    // Copy pubExp Big Endian 
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    //
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    ReverseMemCopy(pbCurrent, (PBYTE) &dwExp, cbExp);
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    pbCurrent += cbExp;
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    //
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    // Copy Modulus Big Endian 
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    //
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    ReverseMemCopy(pbCurrent, pKey->modulus, cbModulus);
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    //
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    // Import the public key
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    //
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    hr = BCryptImportKeyPair(hAlg, NULL, BCRYPT_RSAPUBLIC_BLOB, phKey, (PUCHAR) pbPublicKey, cbKey, 0);
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cleanup:
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    CoTaskMemFree(pbPublicKey);
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    return hr;
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}
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namespace pEp {
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    const LPCTSTR GateKeeper::plugin_reg_path = _T("Software\\Microsoft\\Office\\Outlook\\Addins\\pEp");
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    const LPCTSTR GateKeeper::plugin_reg_value_name = _T("LoadBehavior");
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    const LPCTSTR GateKeeper::updater_reg_path = _T("Software\\pEp\\Updater");
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    const time_t GateKeeper::cycle = 7200;   // 7200 sec is 2 h
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    const time_t GateKeeper::fraction = 10;  // first update is at 10% of cycle
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    const DWORD GateKeeper::waiting = 10000; // 10000 ms is 10 sec
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    GateKeeper::GateKeeper(CpEpCOMServerAdapterModule * self)
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        : _self(self), now(time(NULL)), next(now + time_diff()), hkUpdater(NULL), hkPluginStart(NULL),
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            internet(NULL), hAES(NULL), hRSA(NULL)
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    {
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        LONG lResult = RegOpenCurrentUser(KEY_READ, &cu);
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        assert(lResult == ERROR_SUCCESS);
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        if (lResult == ERROR_SUCCESS)
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            cu_open = true;
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        else
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            cu_open = false;
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        if (cu_open) {
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            LONG lResult = RegOpenKeyEx(cu, updater_reg_path, 0, KEY_READ, &hkUpdater);
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            assert(lResult == ERROR_SUCCESS);
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            if (lResult != ERROR_SUCCESS)
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                return;
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            lResult = RegOpenKeyEx(cu, plugin_reg_path, 0, KEY_WRITE, &hkPluginStart);
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            assert(lResult == ERROR_SUCCESS);
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            if (lResult != ERROR_SUCCESS)
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                return;
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            RegCloseKey(hkPluginStart);
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        }
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    }
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    GateKeeper::~GateKeeper()
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    {
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        if (cu_open) {
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            if (hkUpdater)
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                RegCloseKey(hkUpdater);
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            RegCloseKey(cu);
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        }
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    }
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    time_t GateKeeper::time_diff()
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    {
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        try {
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            static random_device rd;
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            static mt19937 gen(rd());
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            uniform_int_distribution<time_t> dist(0, cycle/fraction);
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            return dist(gen);
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        }
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        catch (exception&) {
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            assert(0);
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            return 0;
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        }
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    }
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    void GateKeeper::keep()
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    {
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        if (!cu_open)
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            return;
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        while (1) {
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            keep_plugin();
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            now = time(NULL);
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            assert(now != -1);
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            if (now > next) {
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                next = now + GateKeeper::cycle;
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                keep_updated();
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            }
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            Sleep(waiting);
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        }
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    }
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    void GateKeeper::keep_plugin()
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    {
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        if (!hkPluginStart)
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            return;
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        LONG lResult = RegOpenKeyEx(cu, plugin_reg_path, 0, KEY_WRITE, &hkPluginStart);
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        assert(lResult == ERROR_SUCCESS);
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        if (lResult != ERROR_SUCCESS)
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            return;
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        DWORD v = 3;
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        lResult = RegSetValueEx(hkPluginStart, plugin_reg_value_name, 0, REG_DWORD, (const BYTE *) &v, sizeof(DWORD));
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        assert(lResult == ERROR_SUCCESS);
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        RegCloseKey(hkPluginStart);
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    }
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    string GateKeeper::update_key()
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    {
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        static string key;
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        if (key.length() == 0) {
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            HRSRC res = FindResource(_self->hModule(), MAKEINTRESOURCE(IRD_UPDATEKEY), RT_RCDATA);
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            assert(res);
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            if (!res)
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                throw runtime_error("FindResource: IRD_UPDATEKEY");
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            HGLOBAL hRes = LoadResource(_self->hModule(), res);
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            assert(hRes);
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            if (!hRes)
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                throw runtime_error("LoadResource: IRD_UPDATEKEY");
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            key = string((char *)LockResource(hRes), SizeofResource(_self->hModule(), res));
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            UnlockResource(hRes);
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        }
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        return key;
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    }
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    BCRYPT_KEY_HANDLE GateKeeper::delivery_key()
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    {
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        aeskey_t key;
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        static random_device rd;
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        static mt19937 gen(rd());
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        uniform_int_distribution<int64_t> dist(0, UINT32_MAX);
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        for (int i = 0; i < 8; i++)
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            key.dw_key[i] = (uint32_t) dist(gen);
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        BCRYPT_KEY_HANDLE hKey;
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        NTSTATUS status = BCryptGenerateSymmetricKey(hAES, &hKey, NULL, 0, (PUCHAR) &key, (ULONG) sizeof(aeskey_t), 0);
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        assert(status == 0);
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        if (status)
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            throw runtime_error("BCryptGenerateSymmetricKey");
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#ifndef NDEBUG
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        DWORD keylength = 0;
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        ULONG copied = 0;
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        status = BCryptGetProperty(hKey, BCRYPT_KEY_LENGTH, (PUCHAR) &keylength, sizeof(DWORD), &copied, 0);
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        assert(keylength == 256);
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#endif
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        return hKey;
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    }
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    string GateKeeper::wrapped_delivery_key(BCRYPT_KEY_HANDLE hDeliveryKey)
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    {
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        string result;
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        BCRYPT_KEY_HANDLE hUpdateKey;
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        string _update_key = update_key();
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        PCERT_PUBLIC_KEY_INFO uk;
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        DWORD uk_size;
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        BOOL bResult = CryptDecodeObjectEx(X509_ASN_ENCODING, X509_PUBLIC_KEY_INFO,
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                (const BYTE *) _update_key.data(), _update_key.size(), CRYPT_DECODE_ALLOC_FLAG, NULL, &uk, &uk_size);
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        if (!bResult)
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            throw runtime_error("CryptDecodeObjectEx: X509_PUBLIC_KEY_INFO");
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        PUBLIC_KEY_VALUES *_uk;
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        DWORD _uk_size;
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        bResult = CryptDecodeObjectEx(X509_ASN_ENCODING, RSA_CSP_PUBLICKEYBLOB,
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            uk->PublicKey.pbData, uk->PublicKey.cbData, CRYPT_DECODE_ALLOC_FLAG, NULL, &_uk, &_uk_size);
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        LocalFree(uk);
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        if (!bResult)
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            throw runtime_error("CryptDecodeObjectEx: X509_PUBLIC_KEY_INFO");
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        HRESULT hResult = ImportRsaPublicKey(hRSA, _uk, &hUpdateKey);
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        LocalFree(_uk);
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        if (hResult)
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            throw runtime_error("ImportRsaPublicKey");
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        ULONG psize;
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        NTSTATUS status = BCryptGetProperty(hUpdateKey, BCRYPT_ALGORITHM_NAME, NULL, 0, &psize, 0);
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        char *prop = new char[psize];
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        TCHAR *_prop = (TCHAR *) prop;
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        BCryptGetProperty(hUpdateKey, BCRYPT_ALGORITHM_NAME, (PUCHAR) prop, psize, &psize, 0);
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        ULONG export_size;
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        status = BCryptExportKey(hDeliveryKey, NULL, BCRYPT_KEY_DATA_BLOB, NULL, NULL,
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            &export_size, 0);
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        if (status)
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            throw runtime_error("BCryptExportKey: measuring export size");
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        PUCHAR _delivery_key = new UCHAR[export_size];
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        ULONG copied;
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        status = BCryptExportKey(hDeliveryKey, NULL, BCRYPT_KEY_DATA_BLOB, _delivery_key, export_size,
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                &copied, 0);
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        if (status) {
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            delete[] _delivery_key;
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            throw runtime_error("BCryptExportKey: delivery_key");
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   307
        }
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   308
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        BCRYPT_OAEP_PADDING_INFO pi;
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        memset(&pi, 0, sizeof(BCRYPT_OAEP_PADDING_INFO));
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        pi.pszAlgId = BCRYPT_SHA256_ALGORITHM;
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        ULONG result_size;
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   314
        PUCHAR _result = NULL;
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        ULONG blob_size = export_size - sizeof(BCRYPT_KEY_DATA_BLOB_HEADER);
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        PUCHAR blob = _delivery_key + sizeof(BCRYPT_KEY_DATA_BLOB_HEADER);
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        status = BCryptEncrypt(hUpdateKey, blob, blob_size, &pi, NULL, 0, NULL, 0, &result_size, BCRYPT_PAD_OAEP);
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        if (status) {
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            delete[] _delivery_key;
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            BCryptDestroyKey(hUpdateKey);
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   321
            throw runtime_error("BCryptEncrypt: calculating result size");
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   322
        }
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   323
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        _result = new UCHAR[result_size];
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        status = BCryptEncrypt(hUpdateKey, blob, blob_size, &pi, NULL, 0, _result, result_size, &copied, BCRYPT_PAD_OAEP);
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        delete[] _delivery_key;
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   327
        if (status) {
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   328
            BCryptDestroyKey(hUpdateKey);
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   329
            delete[] _result;
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   330
            throw runtime_error("BCryptEncrypt: encrypting using update_key");
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   331
        }
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   332
vb@120
   333
        BCryptDestroyKey(hUpdateKey);
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   334
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   335
        stringstream s;
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   336
        for (ULONG i = 0; i < copied; i++) {
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   337
            s << hex << setw(2) << setfill('0');
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   338
            s << (int) _result[i];
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   339
        }
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   340
        delete[] _result;
vb@117
   341
        s >> result;
vb@117
   342
vb@113
   343
        return result;
vb@112
   344
    }
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   345
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   346
    GateKeeper::product_list& GateKeeper::registered_products()
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   347
    {
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   348
        static product_list products;
vb@96
   349
vb@96
   350
        // https://msdn.microsoft.com/en-us/library/windows/desktop/ms724872(v=vs.85).aspx
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   351
        TCHAR value_name[16384];
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   352
        DWORD value_name_size;
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   353
        TCHAR value[L_MAX_URL_LENGTH + 1];
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   354
        DWORD value_size;
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   355
vb@96
   356
        products.empty();
vb@96
   357
vb@96
   358
        LONG lResult = ERROR_SUCCESS;
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   359
        for (DWORD i = 0; lResult == ERROR_SUCCESS; i++) {
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   360
            value_name_size = 16383;
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   361
            value_size = L_MAX_URL_LENGTH + 1;
vb@139
   362
            lResult = RegEnumValue(hkUpdater, i, value_name, &value_name_size, NULL, NULL, (LPBYTE) value, &value_size);
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   363
            if (lResult == ERROR_SUCCESS) {
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   364
                products.push_back({ value_name, value });
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   365
            }
vb@88
   366
        }
vb@88
   367
vb@96
   368
        return products;
vb@88
   369
    }
vb@88
   370
vb@126
   371
    void GateKeeper::install_msi(tstring filename)
vb@126
   372
    {
vb@134
   373
        ShellExecute(NULL, _T("open"), filename.c_str(), NULL, NULL, SW_SHOW);
vb@126
   374
    }
vb@126
   375
vb@97
   376
    void GateKeeper::update_product(product p, DWORD context)
vb@96
   377
    {
vb@127
   378
        BCRYPT_KEY_HANDLE dk = delivery_key();
vb@126
   379
#ifdef UNICODE
vb@127
   380
        tstring delivery = utility::utf16_string(wrapped_delivery_key(dk));
vb@126
   381
#else
vb@126
   382
        tstring delivery = wrapped_delivery_key(delivery_key());
vb@126
   383
#endif
vb@124
   384
        tstring url = p.second;
vb@124
   385
        url += _T("&challenge=");
vb@124
   386
        url += delivery;
vb@124
   387
        tstring headers;
vb@124
   388
        HINTERNET hUrl = InternetOpenUrl(internet, url.c_str(), headers.c_str(), headers.length(),
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   389
                INTERNET_FLAG_EXISTING_CONNECT | INTERNET_FLAG_NO_UI | INTERNET_FLAG_SECURE, context);
vb@97
   390
        if (hUrl == NULL)
vb@97
   391
            return;
vb@94
   392
vb@127
   393
        string crypted;
vb@127
   394
        string unencrypted;
vb@133
   395
        UCHAR iv[12];
vb@133
   396
        UCHAR nonce[sizeof(iv)];
vb@133
   397
        UCHAR tag[16];
vb@138
   398
        tstring filename;
vb@138
   399
        HANDLE hFile = NULL;
vb@138
   400
        char *unencrypted_buffer = NULL;
vb@97
   401
vb@130
   402
        try {
vb@133
   403
            DWORD reading;
vb@133
   404
            InternetReadFile(hUrl, iv, sizeof(iv), &reading);
vb@133
   405
vb@133
   406
            if (reading) do {
vb@130
   407
                static char buffer[1024*1024];
vb@130
   408
                BOOL bResult = InternetReadFile(hUrl, buffer, 1024*1024, &reading);
vb@130
   409
                if (!bResult || !reading)
vb@130
   410
                    break;
vb@130
   411
                crypted += string(buffer, reading);
vb@130
   412
            } while (1);
vb@130
   413
        }
vb@138
   414
        catch (exception&) {
vb@138
   415
            goto closing;
vb@130
   416
        }
vb@133
   417
vb@97
   418
        InternetCloseHandle(hUrl);
vb@126
   419
        hUrl = NULL;
vb@126
   420
vb@133
   421
        memcpy(nonce, iv, sizeof(iv));
vb@133
   422
vb@130
   423
        BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO authInfo;
vb@130
   424
        BCRYPT_INIT_AUTH_MODE_INFO(authInfo);
vb@130
   425
        authInfo.pbNonce = nonce;
vb@130
   426
        authInfo.cbNonce = sizeof(nonce);
vb@133
   427
        authInfo.pbTag = tag;
vb@133
   428
        authInfo.cbTag = sizeof(tag);
vb@128
   429
vb@127
   430
        ULONG unencrypted_size;
vb@127
   431
        NTSTATUS status = BCryptDecrypt(dk, (PUCHAR) crypted.data(), crypted.size(),
vb@131
   432
                &authInfo, iv, sizeof(iv), NULL, 0, &unencrypted_size, 0);
vb@127
   433
        if (status)
vb@127
   434
            goto closing;
vb@127
   435
        
vb@127
   436
        unencrypted_buffer = new char[unencrypted_size];
vb@131
   437
        PUCHAR crypted_data = (PUCHAR) crypted.data();
vb@133
   438
        ULONG crypted_size = (ULONG) crypted.size() - sizeof(tag);
vb@133
   439
        memcpy(tag, crypted_data + crypted_size, sizeof(tag));
vb@133
   440
vb@131
   441
        status = BCryptDecrypt(dk, crypted_data, crypted_size,
vb@133
   442
            &authInfo, iv, sizeof(iv), (PUCHAR) unencrypted_buffer, unencrypted_size, &unencrypted_size, 0);
vb@129
   443
        if (status)
vb@127
   444
            goto closing;
vb@127
   445
vb@134
   446
        BCryptDestroyKey(dk);
vb@134
   447
vb@127
   448
        TCHAR temp_path[MAX_PATH + 1];
vb@127
   449
        GetTempPath(MAX_PATH, temp_path);
vb@127
   450
        filename = temp_path;
vb@127
   451
        filename += _T("\\pEp_");
vb@127
   452
        filename += delivery.substr(0, 32);
vb@127
   453
        filename += _T(".msi");
vb@127
   454
vb@127
   455
        hFile = CreateFile(filename.c_str(), GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
vb@127
   456
        if (!hFile)
vb@127
   457
            goto closing;
vb@127
   458
        DWORD writing;
vb@127
   459
        WriteFile(hFile, unencrypted_buffer, unencrypted_size, &writing, NULL);
vb@127
   460
        CloseHandle(hFile);
vb@127
   461
vb@126
   462
        install_msi(filename);
vb@127
   463
vb@126
   464
        return;
vb@126
   465
vb@126
   466
    closing:
vb@127
   467
        if (unencrypted_buffer)
vb@127
   468
            delete[] unencrypted_buffer;
vb@126
   469
        if (hFile)
vb@126
   470
            CloseHandle(hFile);
vb@126
   471
        if (hUrl)
vb@126
   472
            InternetCloseHandle(hUrl);
vb@127
   473
        BCryptDestroyKey(dk);
vb@96
   474
    }
vb@88
   475
vb@96
   476
    void GateKeeper::keep_updated()
vb@96
   477
    {
vb@116
   478
        NTSTATUS status = BCryptOpenAlgorithmProvider(&hAES, BCRYPT_AES_ALGORITHM, MS_PRIMITIVE_PROVIDER, 0);
vb@116
   479
        assert(status == 0);
vb@116
   480
        if (status)
vb@116
   481
            goto closing;
vb@130
   482
        status = BCryptSetProperty(hAES, BCRYPT_CHAINING_MODE, (PUCHAR) BCRYPT_CHAIN_MODE_GCM, sizeof(BCRYPT_CHAIN_MODE_GCM), 0);
vb@128
   483
        if (status)
vb@128
   484
            goto closing;
vb@116
   485
vb@116
   486
        status = BCryptOpenAlgorithmProvider(&hRSA, BCRYPT_RSA_ALGORITHM, MS_PRIMITIVE_PROVIDER, 0);
vb@116
   487
        assert(status == 0);
vb@116
   488
        if (status)
vb@116
   489
            goto closing;
vb@116
   490
vb@124
   491
        internet = InternetOpen(_T("pEp"), INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
vb@124
   492
        if (!internet)
vb@124
   493
            goto closing;
vb@97
   494
vb@96
   495
        product_list& products = registered_products();
vb@97
   496
        DWORD context = 0;
vb@138
   497
vb@96
   498
        for (auto i = products.begin(); i != products.end(); i++) {
vb@126
   499
            try {
vb@126
   500
                update_product(*i, context++);
vb@126
   501
            }
vb@126
   502
            catch (exception&) {
vb@126
   503
            
vb@126
   504
            }
vb@96
   505
        }
vb@97
   506
vb@116
   507
    closing:
vb@116
   508
        if (internet)
vb@116
   509
            InternetCloseHandle(internet);
vb@116
   510
        if (hAES)
vb@116
   511
            BCryptCloseAlgorithmProvider(hAES, 0);
vb@116
   512
        if (hRSA)
vb@116
   513
            BCryptCloseAlgorithmProvider(hRSA, 0);
vb@97
   514
        internet = NULL;
vb@116
   515
        hAES = NULL;
vb@116
   516
        hRSA = NULL;
vb@96
   517
    }
vb@88
   518
vb@96
   519
} // namespace pEp