office-gobmx/comphelper/source/misc/docpasswordhelper.cxx
Dr. David Alan Gilbert b480552d9c replace find_if by none_of
A set of cases where find_if is used just to test if there are no
matches; use none_of  as per

tdf#153109

Change-Id: I6c705ab7a8289914743199722a444ee40d11d746
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/152200
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
2023-05-26 12:49:14 +02:00

739 lines
26 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* 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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <config_gpgme.h>
#include <algorithm>
#include <string_view>
#include <comphelper/docpasswordhelper.hxx>
#include <comphelper/propertyvalue.hxx>
#include <comphelper/storagehelper.hxx>
#include <comphelper/hash.hxx>
#include <comphelper/base64.hxx>
#include <comphelper/sequence.hxx>
#include <com/sun/star/beans/NamedValue.hpp>
#include <com/sun/star/beans/PropertyValue.hpp>
#include <com/sun/star/task/XInteractionHandler.hpp>
#include <osl/diagnose.h>
#include <sal/log.hxx>
#include <rtl/digest.h>
#include <rtl/random.h>
#include <string.h>
#if HAVE_FEATURE_GPGME
# include <context.h>
# include <data.h>
# include <decryptionresult.h>
#endif
using ::com::sun::star::uno::Sequence;
using ::com::sun::star::uno::Exception;
using ::com::sun::star::uno::Reference;
using ::com::sun::star::task::PasswordRequestMode;
using ::com::sun::star::task::PasswordRequestMode_PASSWORD_ENTER;
using ::com::sun::star::task::PasswordRequestMode_PASSWORD_REENTER;
using ::com::sun::star::task::XInteractionHandler;
using namespace ::com::sun::star;
namespace comphelper {
static uno::Sequence< sal_Int8 > GeneratePBKDF2Hash( std::u16string_view aPassword, const uno::Sequence< sal_Int8 >& aSalt, sal_Int32 nCount, sal_Int32 nHashLength )
{
uno::Sequence< sal_Int8 > aResult;
if ( !aPassword.empty() && aSalt.hasElements() && nCount && nHashLength )
{
OString aBytePass = OUStringToOString( aPassword, RTL_TEXTENCODING_UTF8 );
// FIXME this is subject to the SHA1-bug tdf#114939 - see also
// RequestPassword() in filedlghelper.cxx
aResult.realloc( 16 );
rtl_digest_PBKDF2( reinterpret_cast < sal_uInt8 * > ( aResult.getArray() ),
aResult.getLength(),
reinterpret_cast < const sal_uInt8 * > ( aBytePass.getStr() ),
aBytePass.getLength(),
reinterpret_cast < const sal_uInt8 * > ( aSalt.getConstArray() ),
aSalt.getLength(),
nCount );
}
return aResult;
}
IDocPasswordVerifier::~IDocPasswordVerifier()
{
}
uno::Sequence< beans::PropertyValue > DocPasswordHelper::GenerateNewModifyPasswordInfo( std::u16string_view aPassword )
{
uno::Sequence< beans::PropertyValue > aResult;
uno::Sequence< sal_Int8 > aSalt = GenerateRandomByteSequence( 16 );
sal_Int32 const nPBKDF2IterationCount = 100000;
uno::Sequence< sal_Int8 > aNewHash = GeneratePBKDF2Hash(aPassword, aSalt, nPBKDF2IterationCount, 16);
if ( aNewHash.hasElements() )
{
aResult = { comphelper::makePropertyValue("algorithm-name", OUString( "PBKDF2" )),
comphelper::makePropertyValue("salt", aSalt),
comphelper::makePropertyValue("iteration-count", nPBKDF2IterationCount),
comphelper::makePropertyValue("hash", aNewHash) };
}
return aResult;
}
uno::Sequence<beans::PropertyValue>
DocPasswordHelper::GenerateNewModifyPasswordInfoOOXML(std::u16string_view aPassword)
{
uno::Sequence<beans::PropertyValue> aResult;
if (!aPassword.empty())
{
uno::Sequence<sal_Int8> aSalt = GenerateRandomByteSequence(16);
OUStringBuffer aBuffer(22);
comphelper::Base64::encode(aBuffer, aSalt);
OUString sSalt = aBuffer.makeStringAndClear();
sal_Int32 const nIterationCount = 100000;
OUString sAlgorithm("SHA-512");
const OUString sHash(GetOoxHashAsBase64(OUString(aPassword), sSalt, nIterationCount,
comphelper::Hash::IterCount::APPEND, sAlgorithm));
if (!sHash.isEmpty())
{
aResult = { comphelper::makePropertyValue("algorithm-name", sAlgorithm),
comphelper::makePropertyValue("salt", sSalt),
comphelper::makePropertyValue("iteration-count", nIterationCount),
comphelper::makePropertyValue("hash", sHash) };
}
}
return aResult;
}
uno::Sequence< beans::PropertyValue > DocPasswordHelper::ConvertPasswordInfo( const uno::Sequence< beans::PropertyValue >& aInfo )
{
uno::Sequence< beans::PropertyValue > aResult;
OUString sAlgorithm, sHash, sSalt, sCount;
sal_Int32 nAlgorithm = 0;
for ( const auto & prop : aInfo )
{
if ( prop.Name == "cryptAlgorithmSid" )
{
prop.Value >>= sAlgorithm;
nAlgorithm = sAlgorithm.toInt32();
}
else if ( prop.Name == "salt" )
prop.Value >>= sSalt;
else if ( prop.Name == "cryptSpinCount" )
prop.Value >>= sCount;
else if ( prop.Name == "hash" )
prop.Value >>= sHash;
}
if (nAlgorithm == 1)
sAlgorithm = "MD2";
else if (nAlgorithm == 2)
sAlgorithm = "MD4";
else if (nAlgorithm == 3)
sAlgorithm = "MD5";
else if (nAlgorithm == 4)
sAlgorithm = "SHA-1";
else if (nAlgorithm == 5)
sAlgorithm = "MAC";
else if (nAlgorithm == 6)
sAlgorithm = "RIPEMD";
else if (nAlgorithm == 7)
sAlgorithm = "RIPEMD-160";
else if (nAlgorithm == 9)
sAlgorithm = "HMAC";
else if (nAlgorithm == 12)
sAlgorithm = "SHA-256";
else if (nAlgorithm == 13)
sAlgorithm = "SHA-384";
else if (nAlgorithm == 14)
sAlgorithm = "SHA-512";
if ( !sCount.isEmpty() )
{
sal_Int32 nCount = sCount.toInt32();
aResult = { comphelper::makePropertyValue("algorithm-name", sAlgorithm),
comphelper::makePropertyValue("salt", sSalt),
comphelper::makePropertyValue("iteration-count", nCount),
comphelper::makePropertyValue("hash", sHash) };
}
return aResult;
}
bool DocPasswordHelper::IsModifyPasswordCorrect( std::u16string_view aPassword, const uno::Sequence< beans::PropertyValue >& aInfo )
{
bool bResult = false;
if ( !aPassword.empty() && aInfo.hasElements() )
{
OUString sAlgorithm;
uno::Any aSalt, aHash;
sal_Int32 nCount = 0;
for ( const auto & prop : aInfo )
{
if ( prop.Name == "algorithm-name" )
prop.Value >>= sAlgorithm;
else if ( prop.Name == "salt" )
aSalt = prop.Value;
else if ( prop.Name == "iteration-count" )
prop.Value >>= nCount;
else if ( prop.Name == "hash" )
aHash = prop.Value;
}
if ( sAlgorithm == "PBKDF2" )
{
uno::Sequence<sal_Int8> aIntSalt, aIntHash;
aSalt >>= aIntSalt;
aHash >>= aIntHash;
if (aIntSalt.hasElements() && nCount > 0 && aIntHash.hasElements())
{
uno::Sequence<sal_Int8> aNewHash
= GeneratePBKDF2Hash(aPassword, aIntSalt, nCount, aIntHash.getLength());
for (sal_Int32 nInd = 0; nInd < aNewHash.getLength() && nInd < aIntHash.getLength()
&& aNewHash[nInd] == aIntHash[nInd];
nInd++)
{
if (nInd == aNewHash.getLength() - 1 && nInd == aIntHash.getLength() - 1)
bResult = true;
}
}
}
else if (nCount > 0)
{
OUString sSalt, sHash;
aSalt >>= sSalt;
aHash >>= sHash;
if (!sSalt.isEmpty() && !sHash.isEmpty())
{
const OUString aNewHash(GetOoxHashAsBase64(OUString(aPassword), sSalt, nCount,
comphelper::Hash::IterCount::APPEND,
sAlgorithm));
if (!aNewHash.isEmpty())
bResult = aNewHash == sHash;
}
}
}
return bResult;
}
sal_uInt32 DocPasswordHelper::GetWordHashAsUINT32(
std::u16string_view aUString )
{
static const sal_uInt16 pInitialCode[] = {
0xE1F0, // 1
0x1D0F, // 2
0xCC9C, // 3
0x84C0, // 4
0x110C, // 5
0x0E10, // 6
0xF1CE, // 7
0x313E, // 8
0x1872, // 9
0xE139, // 10
0xD40F, // 11
0x84F9, // 12
0x280C, // 13
0xA96A, // 14
0x4EC3 // 15
};
static const sal_uInt16 pEncryptionMatrix[15][7] = {
{ 0xAEFC, 0x4DD9, 0x9BB2, 0x2745, 0x4E8A, 0x9D14, 0x2A09}, // last-14
{ 0x7B61, 0xF6C2, 0xFDA5, 0xEB6B, 0xC6F7, 0x9DCF, 0x2BBF}, // last-13
{ 0x4563, 0x8AC6, 0x05AD, 0x0B5A, 0x16B4, 0x2D68, 0x5AD0}, // last-12
{ 0x0375, 0x06EA, 0x0DD4, 0x1BA8, 0x3750, 0x6EA0, 0xDD40}, // last-11
{ 0xD849, 0xA0B3, 0x5147, 0xA28E, 0x553D, 0xAA7A, 0x44D5}, // last-10
{ 0x6F45, 0xDE8A, 0xAD35, 0x4A4B, 0x9496, 0x390D, 0x721A}, // last-9
{ 0xEB23, 0xC667, 0x9CEF, 0x29FF, 0x53FE, 0xA7FC, 0x5FD9}, // last-8
{ 0x47D3, 0x8FA6, 0x8FA6, 0x1EDA, 0x3DB4, 0x7B68, 0xF6D0}, // last-7
{ 0xB861, 0x60E3, 0xC1C6, 0x93AD, 0x377B, 0x6EF6, 0xDDEC}, // last-6
{ 0x45A0, 0x8B40, 0x06A1, 0x0D42, 0x1A84, 0x3508, 0x6A10}, // last-5
{ 0xAA51, 0x4483, 0x8906, 0x022D, 0x045A, 0x08B4, 0x1168}, // last-4
{ 0x76B4, 0xED68, 0xCAF1, 0x85C3, 0x1BA7, 0x374E, 0x6E9C}, // last-3
{ 0x3730, 0x6E60, 0xDCC0, 0xA9A1, 0x4363, 0x86C6, 0x1DAD}, // last-2
{ 0x3331, 0x6662, 0xCCC4, 0x89A9, 0x0373, 0x06E6, 0x0DCC}, // last-1
{ 0x1021, 0x2042, 0x4084, 0x8108, 0x1231, 0x2462, 0x48C4} // last
};
sal_uInt32 nResult = 0;
size_t nLen = aUString.size();
if ( nLen )
{
if ( nLen > 15 )
nLen = 15;
sal_uInt16 nHighResult = pInitialCode[nLen - 1];
sal_uInt16 nLowResult = 0;
for ( size_t nInd = 0; nInd < nLen; nInd++ )
{
// NO Encoding during conversion!
// The specification says that the low byte should be used in case it is not NULL
char nHighChar = static_cast<char>( aUString[nInd] >> 8 );
char nLowChar = static_cast<char>( aUString[nInd] & 0xFF );
char nChar = nLowChar ? nLowChar : nHighChar;
for ( int nMatrixInd = 0; nMatrixInd < 7; ++nMatrixInd )
{
if ( ( nChar & ( 1 << nMatrixInd ) ) != 0 )
nHighResult = nHighResult ^ pEncryptionMatrix[15 - nLen + nInd][nMatrixInd];
}
nLowResult = ( ( ( nLowResult >> 14 ) & 0x0001 ) | ( ( nLowResult << 1 ) & 0x7FFF ) ) ^ nChar;
}
nLowResult = static_cast<sal_uInt16>( ( ( ( nLowResult >> 14 ) & 0x001 ) | ( ( nLowResult << 1 ) & 0x7FF ) ) ^ nLen ^ 0xCE4B );
nResult = ( nHighResult << 16 ) | nLowResult;
}
return nResult;
}
sal_uInt16 DocPasswordHelper::GetXLHashAsUINT16(
std::u16string_view aUString,
rtl_TextEncoding nEnc )
{
sal_uInt16 nResult = 0;
OString aString = OUStringToOString( aUString, nEnc );
if ( !aString.isEmpty() && aString.getLength() <= SAL_MAX_UINT16 )
{
for ( sal_Int32 nInd = aString.getLength() - 1; nInd >= 0; nInd-- )
{
nResult = ( ( nResult >> 14 ) & 0x01 ) | ( ( nResult << 1 ) & 0x7FFF );
nResult ^= aString[nInd];
}
nResult = ( ( nResult >> 14 ) & 0x01 ) | ( ( nResult << 1 ) & 0x7FFF );
nResult ^= ( 0x8000 | ( 'N' << 8 ) | 'K' );
nResult ^= aString.getLength();
}
return nResult;
}
Sequence< sal_Int8 > DocPasswordHelper::GetXLHashAsSequence(
std::u16string_view aUString )
{
sal_uInt16 nHash = GetXLHashAsUINT16( aUString );
return {sal_Int8(nHash >> 8), sal_Int8(nHash & 0xFF)};
}
std::vector<unsigned char> DocPasswordHelper::GetOoxHashAsVector(
const OUString& rPassword,
const std::vector<unsigned char>& rSaltValue,
sal_uInt32 nSpinCount,
comphelper::Hash::IterCount eIterCount,
std::u16string_view rAlgorithmName)
{
comphelper::HashType eType;
if (rAlgorithmName == u"SHA-512" || rAlgorithmName == u"SHA512")
eType = comphelper::HashType::SHA512;
else if (rAlgorithmName == u"SHA-256" || rAlgorithmName == u"SHA256")
eType = comphelper::HashType::SHA256;
else if (rAlgorithmName == u"SHA-1" || rAlgorithmName == u"SHA1") // "SHA1" might be in the wild
eType = comphelper::HashType::SHA1;
else if (rAlgorithmName == u"MD5")
eType = comphelper::HashType::MD5;
else
return std::vector<unsigned char>();
return comphelper::Hash::calculateHash( rPassword, rSaltValue, nSpinCount, eIterCount, eType);
}
css::uno::Sequence<sal_Int8> DocPasswordHelper::GetOoxHashAsSequence(
const OUString& rPassword,
std::u16string_view rSaltValue,
sal_uInt32 nSpinCount,
comphelper::Hash::IterCount eIterCount,
std::u16string_view rAlgorithmName)
{
std::vector<unsigned char> aSaltVec;
if (!rSaltValue.empty())
{
css::uno::Sequence<sal_Int8> aSaltSeq;
comphelper::Base64::decode( aSaltSeq, rSaltValue);
aSaltVec = comphelper::sequenceToContainer<std::vector<unsigned char>>( aSaltSeq);
}
std::vector<unsigned char> hash( GetOoxHashAsVector( rPassword, aSaltVec, nSpinCount, eIterCount, rAlgorithmName));
return comphelper::containerToSequence<sal_Int8>( hash);
}
OUString DocPasswordHelper::GetOoxHashAsBase64(
const OUString& rPassword,
std::u16string_view rSaltValue,
sal_uInt32 nSpinCount,
comphelper::Hash::IterCount eIterCount,
std::u16string_view rAlgorithmName)
{
css::uno::Sequence<sal_Int8> aSeq( GetOoxHashAsSequence( rPassword, rSaltValue, nSpinCount,
eIterCount, rAlgorithmName));
OUStringBuffer aBuf((aSeq.getLength()+2)/3*4);
comphelper::Base64::encode( aBuf, aSeq);
return aBuf.makeStringAndClear();
}
/*static*/ uno::Sequence< sal_Int8 > DocPasswordHelper::GenerateRandomByteSequence( sal_Int32 nLength )
{
uno::Sequence< sal_Int8 > aResult( nLength );
rtlRandomPool aRandomPool = rtl_random_createPool ();
rtl_random_getBytes ( aRandomPool, aResult.getArray(), nLength );
rtl_random_destroyPool ( aRandomPool );
return aResult;
}
/*static*/ uno::Sequence< sal_Int8 > DocPasswordHelper::GenerateStd97Key( std::u16string_view aPassword, const uno::Sequence< sal_Int8 >& aDocId )
{
uno::Sequence< sal_Int8 > aResultKey;
if ( !aPassword.empty() && aDocId.getLength() == 16 )
{
sal_uInt16 pPassData[16] = {};
sal_Int32 nPassLen = std::min< sal_Int32 >( aPassword.size(), 15 );
memcpy( pPassData, aPassword.data(), nPassLen * sizeof(pPassData[0]) );
aResultKey = GenerateStd97Key( pPassData, aDocId );
}
return aResultKey;
}
/*static*/ uno::Sequence< sal_Int8 > DocPasswordHelper::GenerateStd97Key( const sal_uInt16 pPassData[16], const uno::Sequence< sal_Int8 >& aDocId )
{
uno::Sequence< sal_Int8 > aResultKey;
if ( aDocId.getLength() == 16 )
aResultKey = GenerateStd97Key(pPassData, reinterpret_cast<const sal_uInt8*>(aDocId.getConstArray()));
return aResultKey;
}
/*static*/ uno::Sequence< sal_Int8 > DocPasswordHelper::GenerateStd97Key( const sal_uInt16 pPassData[16], const sal_uInt8 pDocId[16] )
{
uno::Sequence< sal_Int8 > aResultKey;
if ( pPassData[0] )
{
sal_uInt8 pKeyData[64] = {};
sal_Int32 nInd = 0;
// Fill PassData into KeyData.
for ( nInd = 0; nInd < 16 && pPassData[nInd]; nInd++)
{
pKeyData[2*nInd] = sal::static_int_cast< sal_uInt8 >( (pPassData[nInd] >> 0) & 0xff );
pKeyData[2*nInd + 1] = sal::static_int_cast< sal_uInt8 >( (pPassData[nInd] >> 8) & 0xff );
}
pKeyData[2*nInd] = 0x80;
pKeyData[56] = sal::static_int_cast< sal_uInt8 >( nInd << 4 );
// Fill raw digest of KeyData into KeyData.
rtlDigest hDigest = rtl_digest_create ( rtl_Digest_AlgorithmMD5 );
(void)rtl_digest_updateMD5 (
hDigest, pKeyData, sizeof(pKeyData));
(void)rtl_digest_rawMD5 (
hDigest, pKeyData, RTL_DIGEST_LENGTH_MD5);
// Update digest with KeyData and Unique.
for ( nInd = 0; nInd < 16; nInd++ )
{
rtl_digest_updateMD5( hDigest, pKeyData, 5 );
rtl_digest_updateMD5( hDigest, pDocId, 16 );
}
// Update digest with padding.
pKeyData[16] = 0x80;
memset( pKeyData + 17, 0, sizeof(pKeyData) - 17 );
pKeyData[56] = 0x80;
pKeyData[57] = 0x0a;
rtl_digest_updateMD5( hDigest, &(pKeyData[16]), sizeof(pKeyData) - 16 );
// Fill raw digest of above updates
aResultKey.realloc( RTL_DIGEST_LENGTH_MD5 );
rtl_digest_rawMD5 ( hDigest, reinterpret_cast<sal_uInt8*>(aResultKey.getArray()), aResultKey.getLength() );
// Erase KeyData array and leave.
rtl_secureZeroMemory (pKeyData, sizeof(pKeyData));
rtl_digest_destroy(hDigest);
}
return aResultKey;
}
/*static*/ css::uno::Sequence< css::beans::NamedValue > DocPasswordHelper::requestAndVerifyDocPassword(
IDocPasswordVerifier& rVerifier,
const css::uno::Sequence< css::beans::NamedValue >& rMediaEncData,
const OUString& rMediaPassword,
const Reference< XInteractionHandler >& rxInteractHandler,
const OUString& rDocumentUrl,
DocPasswordRequestType eRequestType,
const std::vector< OUString >* pDefaultPasswords,
bool* pbIsDefaultPassword )
{
css::uno::Sequence< css::beans::NamedValue > aEncData;
OUString aPassword;
DocPasswordVerifierResult eResult = DocPasswordVerifierResult::WrongPassword;
sal_Int32 nMediaEncDataCount = rMediaEncData.getLength();
// tdf#93389: if the document is being restored from autorecovery, we need to add encryption
// data also for real document type.
// TODO: get real filter name here (from CheckPasswd_Impl), to only add necessary data
bool bForSalvage = false;
if (nMediaEncDataCount)
{
for (auto& val : rMediaEncData)
{
if (val.Name == "ForSalvage")
{
--nMediaEncDataCount; // don't consider this element below
val.Value >>= bForSalvage;
break;
}
}
}
// first, try provided default passwords
if( pbIsDefaultPassword )
*pbIsDefaultPassword = false;
if( pDefaultPasswords )
{
for( const auto& rPassword : *pDefaultPasswords )
{
OSL_ENSURE( !rPassword.isEmpty(), "DocPasswordHelper::requestAndVerifyDocPassword - unexpected empty default password" );
if( !rPassword.isEmpty() )
{
eResult = rVerifier.verifyPassword( rPassword, aEncData );
if (eResult == DocPasswordVerifierResult::OK)
{
aPassword = rPassword;
if (pbIsDefaultPassword)
*pbIsDefaultPassword = true;
}
if( eResult != DocPasswordVerifierResult::WrongPassword )
break;
}
}
}
// try media encryption data (skip, if result is OK or ABORT)
if( eResult == DocPasswordVerifierResult::WrongPassword )
{
if (nMediaEncDataCount)
{
eResult = rVerifier.verifyEncryptionData( rMediaEncData );
if( eResult == DocPasswordVerifierResult::OK )
aEncData = rMediaEncData;
}
}
// try media password (skip, if result is OK or ABORT)
if( eResult == DocPasswordVerifierResult::WrongPassword )
{
if( !rMediaPassword.isEmpty() )
{
eResult = rVerifier.verifyPassword( rMediaPassword, aEncData );
if (eResult == DocPasswordVerifierResult::OK)
aPassword = rMediaPassword;
}
}
// request a password (skip, if result is OK or ABORT)
if( (eResult == DocPasswordVerifierResult::WrongPassword) && rxInteractHandler.is() ) try
{
PasswordRequestMode eRequestMode = PasswordRequestMode_PASSWORD_ENTER;
while( eResult == DocPasswordVerifierResult::WrongPassword )
{
rtl::Reference<DocPasswordRequest> pRequest = new DocPasswordRequest( eRequestType, eRequestMode, rDocumentUrl );
rxInteractHandler->handle( pRequest );
if( pRequest->isPassword() )
{
if( !pRequest->getPassword().isEmpty() )
eResult = rVerifier.verifyPassword( pRequest->getPassword(), aEncData );
if (eResult == DocPasswordVerifierResult::OK)
aPassword = pRequest->getPassword();
}
else
{
eResult = DocPasswordVerifierResult::Abort;
}
eRequestMode = PasswordRequestMode_PASSWORD_REENTER;
}
}
catch( Exception& )
{
}
if (eResult == DocPasswordVerifierResult::OK && !aPassword.isEmpty())
{
if (std::none_of(std::cbegin(aEncData), std::cend(aEncData),
[](const css::beans::NamedValue& val) {
return val.Name == PACKAGE_ENCRYPTIONDATA_SHA256UTF8;
}))
{
// tdf#118639: We need ODF encryption data for autorecovery, where password
// will already be unavailable, so generate and append it here
aEncData = comphelper::concatSequences(
aEncData, OStorageHelper::CreatePackageEncryptionData(aPassword));
}
if (bForSalvage)
{
// TODO: add individual methods for different target filter, and only call what's needed
// 1. Prepare binary MS formats encryption data
auto aUniqueID = GenerateRandomByteSequence(16);
auto aEnc97Key = GenerateStd97Key(aPassword, aUniqueID);
// 2. Add MS binary and OOXML encryption data to result
aEncData = comphelper::concatSequences(
aEncData, std::initializer_list<beans::NamedValue>{
{ "STD97EncryptionKey", css::uno::Any(aEnc97Key) },
{ "STD97UniqueID", css::uno::Any(aUniqueID) },
{ "OOXPassword", css::uno::Any(aPassword) },
});
}
}
return (eResult == DocPasswordVerifierResult::OK) ? aEncData : uno::Sequence< beans::NamedValue >();
}
/*static*/ uno::Sequence< css::beans::NamedValue >
DocPasswordHelper::decryptGpgSession(
const uno::Sequence< uno::Sequence< beans::NamedValue > >& rGpgProperties )
{
#if HAVE_FEATURE_GPGME
if ( !rGpgProperties.hasElements() )
return uno::Sequence< beans::NamedValue >();
uno::Sequence< beans::NamedValue > aEncryptionData;
std::unique_ptr<GpgME::Context> ctx;
GpgME::initializeLibrary();
GpgME::Error err = GpgME::checkEngine(GpgME::OpenPGP);
if (err)
throw uno::RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
ctx.reset( GpgME::Context::createForProtocol(GpgME::OpenPGP) );
if (ctx == nullptr)
throw uno::RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
ctx->setArmor(false);
const uno::Sequence < beans::NamedValue > *pSequence = rGpgProperties.getConstArray();
const sal_Int32 nLength = rGpgProperties.getLength();
for ( sal_Int32 i = 0; i < nLength ; i++, pSequence++ )
{
const beans::NamedValue *pValues = pSequence->getConstArray();
if ( pSequence->getLength() == 3 )
{
// take CipherValue and try to decrypt that - stop after
// the first successful decryption
// ctx is setup now, let's decrypt the lot!
uno::Sequence < sal_Int8 > aVector;
pValues[2].Value >>= aVector;
GpgME::Data cipher(
reinterpret_cast<const char*>(aVector.getConstArray()),
size_t(aVector.getLength()), false);
GpgME::Data plain;
GpgME::DecryptionResult crypt_res = ctx->decrypt(
cipher, plain);
// NO_SECKEY -> skip
// BAD_PASSPHRASE -> retry?
off_t result = plain.seek(0,SEEK_SET);
(void) result;
assert(result == 0);
int len=0, curr=0; char buf;
while( (curr=plain.read(&buf, 1)) )
len += curr;
if(crypt_res.error() || !len)
continue; // can't use this key, take next one
uno::Sequence < sal_Int8 > aKeyValue(len);
result = plain.seek(0,SEEK_SET);
assert(result == 0);
if( plain.read(aKeyValue.getArray(), len) != len )
throw uno::RuntimeException("The GpgME library failed to read the encrypted value.");
SAL_INFO("comphelper.crypto", "Extracted gpg session key of length: " << len);
aEncryptionData = { { PACKAGE_ENCRYPTIONDATA_SHA256UTF8, uno::Any(aKeyValue) } };
break;
}
}
if ( aEncryptionData.hasElements() )
{
uno::Sequence< beans::NamedValue > aContainer{
{ "GpgInfos", uno::Any(rGpgProperties) }, { "EncryptionKey", uno::Any(aEncryptionData) }
};
return aContainer;
}
#else
(void)rGpgProperties;
#endif
return uno::Sequence< beans::NamedValue >();
}
} // namespace comphelper
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