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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include "CurlSession.hxx"
#include "CurlUri.hxx"
#include <comphelper/base64.hxx>
#include <comphelper/scopeguard.hxx>
#include <o3tl/char16_t2wchar_t.hxx>
#include <com/sun/star/xml/crypto/DigestID.hpp>
#include <com/sun/star/xml/crypto/NSSInitializer.hpp>
#include <com/sun/star/uno/Sequence.hxx>
#include <osl/file.hxx>
#include <sal/log.hxx>
#include <rtl/string.hxx>
#include <rtl/ustring.hxx>
#ifdef _WIN32
#include <comphelper/windowserrorstring.hxx>
#include <boost/property_tree/json_parser.hpp>
#include <sqlite3.h>
#include <pk11pub.h>
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <Shlobj.h>
#include <Knownfolders.h>
#include <dpapi.h>
#endif
using namespace ::com::sun::star;
namespace http_dav_ucp
{
#ifdef _WIN32
struct Value
{
OString value;
OString encryptedValue;
};
static int callback(void* pArg, int argc, char** argv, char** ppColNames)
{
Value* const pValue(static_cast<Value*>(pArg));
assert(argc == 3);
assert(strcmp(ppColNames[0], "value") == 0);
assert(strcmp(ppColNames[2], "encrypted_value") == 0);
pValue->value = OString(argv[0]); // base64 has no embedded 0
auto const len(OString(argv[1]).toInt32());
assert(len >= 0);
pValue->encryptedValue = OString(argv[2], len);
return 0;
}
#endif
OString TryImportCookies(uno::Reference<uno::XComponentContext> const& xContext[[maybe_unused]],
OUString const& rHost[[maybe_unused]])
{
#ifdef _WIN32
// Sharepoint authentication: try to find a cookie from Microsoft Edge
PWSTR ladPath;
if (S_OK != SHGetKnownFolderPath(FOLDERID_LocalAppData, KF_FLAG_DEFAULT, nullptr, &ladPath))
{
SAL_INFO("ucb.ucp.webdav.curl", "ShGetKnownFolderPath failed");
return OString();
}
OUString const localAppDirPath(o3tl::toU(ladPath));
CoTaskMemFree(ladPath);
OUString localAppDirUrl;
::osl::File::getFileURLFromSystemPath(localAppDirPath, localAppDirUrl);
::osl::DirectoryItem temp;
OUString dbUrlU = localAppDirUrl + "/Microsoft/Edge/User Data/Default/Network/Cookies";
if (::osl::DirectoryItem::get(dbUrlU, temp) != osl_File_E_None)
{
dbUrlU = localAppDirUrl + "/Microsoft/Edge/User Data/Default/Cookies";
if (::osl::DirectoryItem::get(dbUrlU, temp) != osl_File_E_None)
{
SAL_INFO("ucb.ucp.webdav.curl", "no Cookies file");
return OString();
}
}
OString const dbUrl(::rtl::OUStringToOString(dbUrlU, RTL_TEXTENCODING_UTF8));
sqlite3* db;
int rc = sqlite3_open_v2(dbUrl.getStr(), &db, SQLITE_OPEN_READONLY | SQLITE_OPEN_URI, nullptr);
if (rc != SQLITE_OK)
{
SAL_INFO("ucb.ucp.webdav.curl", "sqlite3_open failed: " << sqlite3_errmsg(db));
sqlite3_close(db);
}
char* err(nullptr);
Value value;
OString const statement("SELECT value, LENGTH(encrypted_value), encrypted_value FROM cookies "
"WHERE name = \"FedAuth\" AND host_key = \""
+ ::rtl::OUStringToOString(rHost, RTL_TEXTENCODING_ASCII_US) + "\";");
rc = sqlite3_exec(db, statement.getStr(), callback, &value, &err);
if (rc != SQLITE_OK)
{
SAL_WARN("ucb.ucp.webdav.curl", "sqlite3_exec failed: " << err);
sqlite3_free(err);
}
sqlite3_close(db);
if (!value.value.isEmpty())
{
return value.value;
}
if (value.encryptedValue.getLength() < 3 + 12 + 16)
{
SAL_INFO("ucb.ucp.webdav.curl", "encrypted_value too short: " << value.encryptedValue.getLength());
return OString();
}
OString const iv(value.encryptedValue.copy(3, 12));
OString const encryptedValue(
value.encryptedValue.copy(3 + 12, value.encryptedValue.getLength() - 3 - 12 - 16));
OString const tag(value.encryptedValue.copy(value.encryptedValue.getLength() - 16, 16));
OUString const stateUrl = localAppDirUrl + "/Microsoft/Edge/User Data/Local State";
OUString statePathU;
::osl::File::getSystemPathFromFileURL(stateUrl, statePathU);
OString const statePath(::rtl::OUStringToOString(statePathU, RTL_TEXTENCODING_UTF8));
::std::string sEncryptedKey;
try
{
::boost::property_tree::ptree localState;
::boost::property_tree::read_json(::std::string(statePath.getStr()), localState);
sEncryptedKey = localState.get<std::string>("os_crypt.encrypted_key");
}
catch (...)
{
SAL_INFO("ucb.ucp.webdav.curl", "failed to parse Local State");
return OString();
}
OUString const encodedEncryptedKey(sEncryptedKey.data(), sEncryptedKey.size(),
RTL_TEXTENCODING_UTF8);
uno::Sequence<sal_Int8> decodedEncryptedKey;
::comphelper::Base64::decode(decodedEncryptedKey, encodedEncryptedKey);
if (decodedEncryptedKey.getLength() < 5)
{
SAL_INFO("ucb.ucp.webdav.curl", "decoded key too short: " << decodedEncryptedKey.getLength());
return OString();
}
DATA_BLOB protectedKey;
protectedKey.cbData = decodedEncryptedKey.getLength() - 5;
protectedKey.pbData
= reinterpret_cast<BYTE*>(const_cast<sal_Int8*>(decodedEncryptedKey.getConstArray())) + 5;
DATA_BLOB unprotectedKey;
if (CryptUnprotectData(&protectedKey, nullptr, nullptr, nullptr, nullptr,
CRYPTPROTECT_UI_FORBIDDEN, &unprotectedKey)
== FALSE)
{
SAL_INFO("ucb.ucp.webdav.curl", "CryptUnprotectData failed: " << WindowsErrorString(GetLastError()));
assert(false);
return OString();
}
::comphelper::ScopeGuard g([&]() {
SecureZeroMemory(unprotectedKey.pbData, unprotectedKey.cbData);
LocalFree(unprotectedKey.pbData);
});
if (unprotectedKey.cbData < 16)
{
SAL_WARN("ucb.ucp.webdav.curl", "CryptUnprotectData result too short: " << unprotectedKey.cbData);
return OString();
}
// first, init NSS - but can't do AES GCM via API so do it directly
uno::Reference<xml::crypto::XNSSInitializer> xNSS(
xml::crypto::NSSInitializer::create(xContext));
xNSS->getDigestContext(xml::crypto::DigestID::SHA256, {});
SECItem keyItem = { siBuffer, reinterpret_cast<unsigned char*>(unprotectedKey.pbData),
sal::static_int_cast<unsigned>(unprotectedKey.cbData) };
::std::unique_ptr<PK11SlotInfo, deleter_from_fn<PK11SlotInfo, PK11_FreeSlot>> pSlot(
PK11_GetBestSlot(CKM_AES_GCM, nullptr));
if (!pSlot)
{
SAL_WARN("ucb.ucp.webdav.curl", "PK11_GetBestSlot failed");
return OString();
}
::std::unique_ptr<PK11SymKey, deleter_from_fn<PK11SymKey, PK11_FreeSymKey>> pSymKey(
PK11_ImportSymKey(pSlot.get(), CKM_AES_GCM, PK11_OriginDerive, CKA_DECRYPT, &keyItem,
nullptr));
if (!pSymKey)
{
SAL_WARN("ucb.ucp.webdav.curl", "PK11_ImportSymKey failed");
return OString();
}
SECItem dummy = { siBuffer, nullptr, 0 };
struct ContextDeleter
{
void operator()(PK11Context* p) const { PK11_DestroyContext(p, PR_TRUE); }
};
::std::unique_ptr<PK11Context, ContextDeleter> pContext(PK11_CreateContextBySymKey(
CKM_AES_GCM, CKA_NSS_MESSAGE | CKA_DECRYPT, pSymKey.get(), &dummy));
if (!pContext)
{
SAL_WARN("ucb.ucp.webdav.curl", "PK11_CreateContextBySymKey failed");
return OString();
}
::std::vector<unsigned char> unencryptedValue;
unencryptedValue.resize(encryptedValue.getLength());
int outLength(0);
SECStatus rv = PK11_AEADOp(
pContext.get(), CKG_NO_GENERATE, 0, // only used for encryption
reinterpret_cast<unsigned char*>(const_cast<sal_Char*>(iv.getStr())), iv.getLength(),
nullptr, 0, // "additional data" not used
unencryptedValue.data(), &outLength, encryptedValue.getLength(),
reinterpret_cast<unsigned char*>(const_cast<sal_Char*>(tag.getStr())), tag.getLength(),
reinterpret_cast<const unsigned char*>(encryptedValue.getStr()),
encryptedValue.getLength());
if (rv != SECSuccess)
{
SAL_WARN("ucb.ucp.webdav.curl", "PK11_AEADOp failed: " << rv);
return OString();
}
if (outLength != encryptedValue.getLength())
{
SAL_WARN("ucb.ucp.webdav.curl", "PK11_AEADOp unexpected output length");
return OString();
}
return "FedAuth="
+ OString(reinterpret_cast<const char*>(unencryptedValue.data()),
unencryptedValue.size())
+ ";";
#else
return OString();
#endif
}
} // namespace http_dav_ucp
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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