tdecryptographiccarddevice.cpp

/* This file is part of the TDE libraries
   Copyright (C) 2015 Timothy Pearson <kb9vqf@pearsoncomputing.net>
 
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License version 2 as published by the Free Software Foundation.
 
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.
 
   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/
 
#ifdef WITH_PKCS
    #define _TDECRYPTOGRAPHICCARDDEVICE_INTERNAL 1
#endif
 
#include "tdecryptographiccarddevice_private.h"
#include "tdecryptographiccarddevice.h"
 
#include <tqpixmap.h>
#include <tqtimer.h>
#include <tqthread.h>
#include <tqeventloop.h>
#include <tqapplication.h>
 
#include "tdeglobal.h"
#include "tdelocale.h"
#include "tdeapplication.h"
 
#include "tdehardwaredevices.h"
 
#include "config.h"
 
// 1 second
#define PCSC_POLL_TIMEOUT_S 1000
 
#define CARD_MAX_LOGIN_RETRY_COUNT 3
 
/* FIXME
 * This is incomplete
 */
#ifdef WITH_PCSC
static TQString pcsc_error_code_to_string(long errcode) {
    if (errcode == SCARD_W_UNPOWERED_CARD) {
        return i18n("card not powered on");
    }
    else if (errcode == SCARD_E_PROTO_MISMATCH) {
        return i18n("protocol mismatch");
    }
    else {
        return TQString::null;
    }
}
#endif
 
CryptoCardDeviceWatcher::CryptoCardDeviceWatcher() {
#ifdef WITH_PCSC
    m_readerStates = NULL;
#endif
    m_cardPINPromptDone = true;
    m_pinCallbacksEnabled = false;
    m_cardReusePIN = false;
}
 
CryptoCardDeviceWatcher::~CryptoCardDeviceWatcher() {
#ifdef WITH_PCSC
    free(m_readerStates);
#endif
}
 
void CryptoCardDeviceWatcher::run() {
#ifdef WITH_PCSC
    bool first_loop;
    unsigned int i;
    long ret;
 
    DWORD dword_readers;
    LPSTR lpstring_readers = NULL;
 
    TQStringList readers;
 
    first_loop = true;
    m_terminationRequested = false;
 
    TQEventLoop* eventLoop = TQApplication::eventLoop();
    if (!eventLoop) return;
 
    ret = SCardEstablishContext(SCARD_SCOPE_SYSTEM, NULL, NULL, &m_cardContext);
    if (ret != SCARD_S_SUCCESS) {
        printf("TDECryptographicCardDevice: PCSC SCardEstablishContext cannot connect to resource manager (%lX)", ret);
        eventLoop->exit(0);
        return;
    }
 
    ret = SCardListReaders(m_cardContext, NULL, NULL, &dword_readers);
    if (ret == SCARD_S_SUCCESS) {
        lpstring_readers = (LPSTR)malloc(sizeof(char)*dword_readers);
        if (lpstring_readers == NULL) {
            printf("TDECryptographicCardDevice: insufficient memory, aborting");
            eventLoop->exit(0);
            return;
        }
 
        ret = SCardListReaders(m_cardContext, NULL, lpstring_readers, &dword_readers);
        if (ret == SCARD_S_SUCCESS) {
            /* Extract reader names from the null separated string */
            char *ptr = lpstring_readers;
            while (*ptr != '\0') {
                readers.append(ptr);
                ptr += strlen(ptr)+1;
            }
 
            free(lpstring_readers);
 
            m_readerStates = (SCARD_READERSTATE*)calloc(readers.count(), sizeof(*m_readerStates));
            if (m_readerStates == NULL) {
                printf("TDECryptographicCardDevice: insufficient memory, aborting");
                free(lpstring_readers);
                eventLoop->exit(0);
                return;
            }
 
            for (i=0; i<readers.count(); i++) {
                m_readerStates[i].szReader = strdup(readers[i].ascii());
                m_readerStates[i].dwCurrentState = SCARD_STATE_UNAWARE;
            }
 
            ret = SCardGetStatusChange(m_cardContext, PCSC_POLL_TIMEOUT_S, m_readerStates, readers.count());
            while ((ret == SCARD_S_SUCCESS) || (ret == SCARD_E_TIMEOUT)) {
                if (m_terminationRequested) {
                    for (i=0; i<readers.count(); i++) {
                        free((char*)m_readerStates[i].szReader);
                        m_readerStates[i].szReader = NULL;
                    }
                    eventLoop->exit(0);
                    return;
                }
 
                for (i=0; i<readers.count(); i++) {
                    /* FIXME
                     * Find a better / more reliable way to match the card low level device to the PCSC name
                     */
                    SCARDHANDLE hCard = 0;
                    DWORD dwActiveProtocol = 0;
                    DWORD cByte = 0;
                    TQString reader_vendor_name;
                    TQString reader_interface_type;
                    
                    ret = SCardConnect(m_cardContext, readers[i].ascii(), SCARD_SHARE_DIRECT, SCARD_PROTOCOL_T0 | SCARD_PROTOCOL_T1, &hCard, &dwActiveProtocol);
                    if (ret == SCARD_S_SUCCESS) {
                        ret = SCardGetAttrib(hCard, SCARD_ATTR_VENDOR_NAME, NULL, &cByte);
                        if (ret == SCARD_S_SUCCESS) {
                            char* data = new char[cByte];
                            ret = SCardGetAttrib(hCard, SCARD_ATTR_VENDOR_NAME, (LPBYTE)data, &cByte);
                            reader_vendor_name = data;
                            delete [] data;
                        }
                        ret = SCardGetAttrib(hCard, SCARD_ATTR_VENDOR_IFD_TYPE, NULL, &cByte);
                        if (ret == SCARD_S_SUCCESS) {
                            char* data = new char[cByte];
                            ret = SCardGetAttrib(hCard, SCARD_ATTR_VENDOR_IFD_TYPE, (LPBYTE)data, &cByte);
                            reader_interface_type = data;
                            delete [] data;
                        }
                        SCardDisconnect(hCard, SCARD_LEAVE_CARD);
                    }
 
                    /* FIXME
                     * If only one reader was detected by PCSC, assume it corresponds to the current device node.
                     * This is fragile, but avoids corner cases with common systems failing to work due to
                     * mismatched udev / PCSC card reader vendor names...
                     */
                    if (readers.count() > 1) {
                        if (!readers[i].contains(cardDevice->friendlyName())) {
                            if (!cardDevice->friendlyName().contains(reader_vendor_name) ||
                                ((reader_interface_type != "") && !cardDevice->friendlyName().contains(reader_vendor_name))) {
                                continue;
                            }
                        }
                    }
 
                    if (first_loop) {
                        if (m_readerStates[i].dwEventState & SCARD_STATE_PRESENT) {
                            // sleep(1);    // Allow the card to settle
                            TQString atr = getCardATR(readers[i]);
                            retrieveCardCertificates(readers[i]);
                            statusChanged("PRESENT", atr);
                        }
                        else {
                            deleteAllCertificatesFromCache();
                        }
                        first_loop = false;
                    }
                    if (m_readerStates[i].dwEventState & SCARD_STATE_CHANGED) {
                        if ((m_readerStates[i].dwCurrentState & SCARD_STATE_PRESENT)
                            && (m_readerStates[i].dwEventState & SCARD_STATE_EMPTY)) {
                            deleteAllCertificatesFromCache();
                            statusChanged("REMOVED", TQString::null);
                        }
                        else if ((m_readerStates[i].dwCurrentState & SCARD_STATE_EMPTY)
                            && (m_readerStates[i].dwEventState & SCARD_STATE_PRESENT)) {
                            // sleep(1);    // Allow the card to settle
                            TQString atr = getCardATR(readers[i]);
                            retrieveCardCertificates(readers[i]);
                            statusChanged("INSERTED", atr);
                        }
                        m_readerStates[i].dwCurrentState = m_readerStates[i].dwEventState;
                    }
                    else {
                        continue;
                    }
                }
                ret = SCardGetStatusChange(m_cardContext, PCSC_POLL_TIMEOUT_S, m_readerStates, readers.count());
            }
        }
    }
 
    eventLoop->exit(0);
#endif
}
 
void CryptoCardDeviceWatcher::requestTermination() {
    m_terminationRequested = true;
}
 
void CryptoCardDeviceWatcher::setProvidedPin(TQString pin) {
    m_cardPIN = pin;
    m_cardPINPromptDone = true;
}
 
void CryptoCardDeviceWatcher::retrySamePin(bool enable) {
    m_cardReusePIN = enable;
    if (!enable) {
        m_cardPIN = "SHREDDINGTHEPINISMOSTSECURE";
        m_cardPIN = TQString::null;
    }
}
 
TQString CryptoCardDeviceWatcher::getCardATR(TQString readerName) {
#ifdef WITH_PCSC
    unsigned int i;
    long ret;
    TQString atr_formatted;
    SCARDHANDLE hCard = 0;
    DWORD dwActiveProtocol = 0;
    DWORD cByte = 0;
 
    ret = SCardConnect(m_cardContext, readerName.ascii(), SCARD_SHARE_SHARED, SCARD_PROTOCOL_T0 | SCARD_PROTOCOL_T1, &hCard, &dwActiveProtocol);
    if (ret == SCARD_S_SUCCESS) {
        ret = SCardGetAttrib(hCard, SCARD_ATTR_ATR_STRING, NULL, &cByte);
        if (ret == SCARD_S_SUCCESS) {
            char* data = new char[cByte];
            ret = SCardGetAttrib(hCard, SCARD_ATTR_ATR_STRING, (LPBYTE)data, &cByte);
            atr_formatted = TQString::null;
            for (i=0; i<cByte; i++) {
                TQString formatted;
                formatted.sprintf("%02x ", ((uint8_t)(*(data+i))));
                atr_formatted.append(formatted.upper());
            }
            atr_formatted = atr_formatted.stripWhiteSpace();
            delete [] data;
            SCardDisconnect(hCard, SCARD_LEAVE_CARD);
        }
    }
    else {
        TQString errstring = pcsc_error_code_to_string(ret);
        if (errstring != "") {
            atr_formatted = i18n("Unknown (%1)").arg(errstring);
        }
        else {
            atr_formatted = TQString("CARD_CONNECT_FAIL (%1)").arg(ret, 0, 16);
        }
    }
 
    return atr_formatted;
#else
    return TQString::null;
#endif
}
 
void CryptoCardDeviceWatcher::enablePINEntryCallbacks(bool enable) {
    m_pinCallbacksEnabled = enable;
}
 
TQString CryptoCardDeviceWatcher::doPinRequest(TQString prompt) {
    if (!m_pinCallbacksEnabled) {
        return TQString::null;
    }
 
    if (m_cardReusePIN) {
        return m_cardPIN;
    }
 
    m_cardPINPromptDone = false;
    emit(pinRequested(prompt));
    while (!m_cardPINPromptDone) {
        usleep(100);
    }
 
    if (m_cardPIN.length() > 0) {
        return m_cardPIN;
    }
    else {
        return TQString::null;
    }
}
 
#ifdef WITH_PKCS
static void pkcs_log_hook(IN void * const global_data, IN unsigned flags, IN const char * const format, IN va_list args) {
    vprintf(format, args);
    printf("\n");
}
 
static PKCS11H_BOOL pkcs_pin_hook(IN void * const global_data, IN void * const user_data, IN const pkcs11h_token_id_t token, IN const unsigned retry, OUT char * const pin, IN const size_t pin_max) {
    CryptoCardDeviceWatcher* watcher = (CryptoCardDeviceWatcher*)global_data;
 
    TQString providedPin = watcher->doPinRequest(i18n("Please enter the PIN for '%1'").arg(token->display));
    if (providedPin.length() > 0) {
        snprintf(pin, pin_max, "%s", providedPin.ascii());
 
        // Success
        return 1;
    }
    else {
        // Abort
        return 0;
    }
}
#endif
 
int CryptoCardDeviceWatcher::initializePkcs() {
#if defined(WITH_PKCS)
    CK_RV rv;
    printf("Initializing pkcs11-helper\n");
    if ((rv = pkcs11h_initialize()) != CKR_OK) {
        printf("pkcs11h_initialize failed: %s\n", pkcs11h_getMessage(rv));
        return -1;
    }
 
    printf("Registering pkcs11-helper hooks\n");
    if ((rv = pkcs11h_setLogHook(pkcs_log_hook, this)) != CKR_OK) {
        printf("pkcs11h_setLogHook failed: %s\n", pkcs11h_getMessage(rv));
        return -1;
    }
    pkcs11h_setLogLevel(PKCS11H_LOG_WARN);
    // pkcs11h_setLogLevel(PKCS11H_LOG_DEBUG2);
 
#if 0
    if ((rv = pkcs11h_setTokenPromptHook(_pkcs11h_hooks_token_prompt, NULL)) != CKR_OK) {
        printf("pkcs11h_setTokenPromptHook failed: %s\n", pkcs11h_getMessage(rv));
        return -1;
    }
#endif
 
    if ((rv = pkcs11h_setMaxLoginRetries(CARD_MAX_LOGIN_RETRY_COUNT)) != CKR_OK) {
        printf("pkcs11h_setMaxLoginRetries failed: %s\n", pkcs11h_getMessage(rv));
        return -1;
    }
 
    if ((rv = pkcs11h_setPINPromptHook(pkcs_pin_hook, this)) != CKR_OK) {
        printf("pkcs11h_setPINPromptHook failed: %s\n", pkcs11h_getMessage(rv));
        return -1;
    }
 
    printf("Adding provider '%s'\n", OPENSC_PKCS11_PROVIDER_LIBRARY);
        if ((rv = pkcs11h_addProvider(OPENSC_PKCS11_PROVIDER_LIBRARY, OPENSC_PKCS11_PROVIDER_LIBRARY, false, PKCS11H_PRIVATEMODE_MASK_AUTO, PKCS11H_SLOTEVENT_METHOD_AUTO, 0, false)) != CKR_OK) {
        printf("pkcs11h_addProvider failed: %s\n", pkcs11h_getMessage(rv));
        return -1;
    }
 
    return 0;
#else
    return -1;
#endif
}
 
int CryptoCardDeviceWatcher::retrieveCardCertificates(TQString readerName) {
#if defined(WITH_PKCS)
    int ret = -1;
 
    CK_RV rv;
    pkcs11h_certificate_id_list_t issuers;
    pkcs11h_certificate_id_list_t certs;
 
    if (initializePkcs() < 0) {
        printf("Unable to initialize PKCS\n");
        return -1;
    }
 
    rv = pkcs11h_certificate_enumCertificateIds(PKCS11H_ENUM_METHOD_CACHE, NULL, PKCS11H_PROMPT_MASK_ALLOW_PIN_PROMPT, &issuers, &certs);
    if ((rv != CKR_OK) || (certs == NULL)) {
        printf("Cannot enumerate certificates: %s\n", pkcs11h_getMessage(rv));
        return -1;
    }
    printf("Successfully enumerated certificates\n");
 
    int i = 0;
    for (pkcs11h_certificate_id_list_t cert = certs; cert != NULL; cert = cert->next) {
        TQString label = cert->certificate_id->displayName;
        printf("Certificate %d name: '%s'\n", i, label.ascii());
 
        pkcs11h_certificate_t certificate;
        rv = pkcs11h_certificate_create(certs->certificate_id, NULL, PKCS11H_PROMPT_MASK_ALLOW_PIN_PROMPT, PKCS11H_PIN_CACHE_INFINITE, &certificate);
        if (rv != CKR_OK) {
            printf("Cannot read certificate: %s\n", pkcs11h_getMessage(rv));
            pkcs11h_certificate_freeCertificateId(certs->certificate_id);
            ret = -1;
            break;
        }
 
        pkcs11h_certificate_freeCertificateId(certs->certificate_id);
 
        pkcs11h_openssl_session_t openssl_session = NULL;
        if ((openssl_session = pkcs11h_openssl_createSession(certificate)) == NULL) {
            printf("Cannot initialize openssl session to retrieve cryptographic objects\n");
            pkcs11h_certificate_freeCertificate(certificate);
            ret = -1;
            break;
        }
        certificate = NULL; // the certificate object is managed by openssl_session
 
        X509* x509_local;
        x509_local = pkcs11h_openssl_session_getX509(openssl_session);
        if (x509_local) {
            printf("Successfully retrieved X509 certificate\n");
        }
        else {
            printf("Cannot get X509 object\n");
            ret = -1;
        }
#if 0
        RSA* rsa_local;
        rsa_local = pkcs11h_openssl_session_getRSA(openssl_session);
        if (rsa_local) {
            printf("Successfully retrieved RSA public key\n");
        }
        else {
            printf("Cannot get RSA object\n");
            ret = -1;
        }
#endif
 
        X509* x509_copy = X509_dup(x509_local);
        if (x509_copy) {
            cardDevice->m_cardCertificates.append(x509_copy);
        }
        else {
            printf("Unable to copy X509 certificate\n");
        }
 
        pkcs11h_openssl_freeSession(openssl_session);
        i++;
    }
 
    pkcs11h_certificate_freeCertificateIdList(issuers);
 
    return ret;
#else
    return -1;
#endif
}
 
void CryptoCardDeviceWatcher::deleteAllCertificatesFromCache() {
#ifdef WITH_PKCS
    X509 *x509_cert;
 
    X509CertificatePtrListIterator it;
    for (it = cardDevice->m_cardCertificates.begin(); it != cardDevice->m_cardCertificates.end(); ++it) {
        x509_cert = *it;
        X509_free(x509_cert);
    }
 
    cardDevice->m_cardCertificates.clear();
#endif
}
 
TDECryptographicCardDevice::TDECryptographicCardDevice(TDEGenericDeviceType::TDEGenericDeviceType dt, TQString dn) : TDEGenericDevice(dt, dn),
    m_watcherThread(NULL),
    m_watcherObject(NULL),
    m_cardPresent(false) {
}
 
TDECryptographicCardDevice::~TDECryptographicCardDevice() {
    enableCardMonitoring(false);
}
 
void TDECryptographicCardDevice::enableCardMonitoring(bool enable) {
#ifdef WITH_PCSC
    if (enable) {
        if (m_watcherObject && m_watcherThread) {
            // Monitoring thread already active
            if ((cardPresent() == 1) && (cardX509Certificates().count() > 0)) {
                // Card was already inserted and initialized
                emit(certificateListAvailable(this));
            }
 
            // Abort!
            return;
        }
 
        m_watcherThread = new TQEventLoopThread();
        m_watcherObject = new CryptoCardDeviceWatcher();
 
        m_watcherObject->cardDevice = this;
        m_watcherObject->moveToThread(m_watcherThread);
        TQObject::connect(m_watcherObject, TQ_SIGNAL(statusChanged(TQString,TQString)), this, TQ_SLOT(cardStatusChanged(TQString,TQString)));
        TQObject::connect(m_watcherObject, TQ_SIGNAL(pinRequested(TQString)), this, TQ_SLOT(workerRequestedPin(TQString)));
        TQTimer::singleShot(0, m_watcherObject, TQ_SLOT(run()));
 
        m_watcherThread->start();
    }
    else {
        if (m_watcherObject) {
            m_watcherObject->requestTermination();
        }
        if (m_watcherThread) {
            m_watcherThread->wait();
            delete m_watcherThread;
            m_watcherThread = NULL;
        }
        if (m_watcherObject) {
            delete m_watcherObject;
            m_watcherObject = NULL;
        }
    }
#endif
}
 
void TDECryptographicCardDevice::enablePINEntryCallbacks(bool enable) {
    if (m_watcherObject) {
        m_watcherObject->enablePINEntryCallbacks(enable);
    }
}
 
int TDECryptographicCardDevice::cardPresent() {
    if (m_watcherObject && m_watcherThread) {
        if (m_cardPresent)
            return 1;
        else
            return 0;
    }
    else {
        return -1;
    }
}
 
TQString TDECryptographicCardDevice::cardATR() {
    if (m_watcherObject && m_watcherThread) {
        if (m_cardPresent)
            return m_cardATR;
        else
            return TQString::null;
    }
    else {
        return TQString::null;
    }
}
 
X509CertificatePtrList TDECryptographicCardDevice::cardX509Certificates() {
    if (m_watcherObject && m_watcherThread) {
        if (m_cardPresent) {
            return m_cardCertificates;
        }
        else {
            return X509CertificatePtrList();
        }
    }
    else {
        return X509CertificatePtrList();
    }
}
 
void TDECryptographicCardDevice::cardStatusChanged(TQString status, TQString atr) {
    if (status == "INSERTED") {
        m_cardPresent = true;
        m_cardATR = atr;
        emit(cardInserted(this));
        if (m_cardCertificates.count() > 0) {
            emit(certificateListAvailable(this));
        }
    }
    else if (status == "REMOVED") {
        m_cardPresent = false;
        m_cardATR = atr;
        emit(cardRemoved(this));
    }
    else if (status == "PRESENT") {
        m_cardATR = atr;
        m_cardPresent = true;
        if (m_cardCertificates.count() > 0) {
            emit(certificateListAvailable(this));
        }
    }
}
 
void TDECryptographicCardDevice::setProvidedPin(TQString pin) {
    if (m_watcherObject) {
        m_watcherObject->setProvidedPin(pin);
    }
}
 
TQString TDECryptographicCardDevice::autoPIN() {
#if defined(WITH_PKCS)
    TQString retString = TQString::null;
 
    // Use subjAltName field in card certificate to provide the card's PIN,
    // in order to support optional pin-less operation.
    // Parse the TDE autologin extension
    // Structure:
    // OID 1.3.6.1.4.1.40364.1.2.1
    //  SEQUENCE
    //      ASN1_CONSTRUCTED [index: 0] (field name: pin)
    //          GeneralString
 
    // Register custom OID type for TDE autopin data
    ASN1_OBJECT* tde_autopin_data_object = OBJ_txt2obj("1.3.6.1.4.1.40364.1.2.1", 0);
 
    int i;
    X509CertificatePtrListIterator it;
    for (it = m_cardCertificates.begin(); it != m_cardCertificates.end(); ++it) {
        X509* x509_cert = *it;
        GENERAL_NAMES* subjectAltNames = (GENERAL_NAMES*)X509_get_ext_d2i(x509_cert, NID_subject_alt_name, NULL, NULL);
        int altNameCount = sk_GENERAL_NAME_num(subjectAltNames);
        for (i=0; i < altNameCount; i++) {
            GENERAL_NAME* generalName = sk_GENERAL_NAME_value(subjectAltNames, i);
            if (generalName->type == GEN_OTHERNAME) {
                OTHERNAME* otherName = generalName->d.otherName;
                if (!OBJ_cmp(otherName->type_id, tde_autopin_data_object)) {
                    ASN1_TYPE* asnValue = otherName->value;
                    if (asnValue) {
                        // Found autopin structure
                        ASN1_TYPE* asnSeqValue = NULL;
                        ASN1_GENERALSTRING* asnGeneralString = NULL;
                        STACK_OF(ASN1_TYPE) *asnSeqValueStack = NULL;
                        long asn1SeqValueObjectLength;
                        int asn1SeqValueObjectTag;
                        int asn1SeqValueObjectClass;
                        int returnCode;
                        int index = 0;  // Search for the PIN field
 
                        const uint8_t* asnSeqValueString = ASN1_STRING_get0_data(asnValue->value.sequence);
                        asnSeqValueStack = d2i_ASN1_SEQUENCE_ANY(NULL, &asnSeqValueString, ASN1_STRING_length(asnValue->value.sequence));
                        asnSeqValue = sk_ASN1_TYPE_value(asnSeqValueStack, index);
                        if (asnSeqValue) {
                            if (ASN1_STRING_get0_data(asnSeqValue->value.octet_string)[0] == ((V_ASN1_CONSTRUCTED | V_ASN1_CONTEXT_SPECIFIC) + index)) {
                                const unsigned char* asn1SeqValueObjectData = ASN1_STRING_get0_data(asnSeqValue->value.sequence);
                                returnCode = ASN1_get_object(&asn1SeqValueObjectData, &asn1SeqValueObjectLength, &asn1SeqValueObjectTag, &asn1SeqValueObjectClass, ASN1_STRING_length(asnSeqValue->value.sequence));
                                if (!(returnCode & 0x80)) {
                                    if (returnCode == (V_ASN1_CONSTRUCTED + index)) {
                                        if (d2i_ASN1_GENERALSTRING(&asnGeneralString, &asn1SeqValueObjectData, asn1SeqValueObjectLength) != NULL) {
                                            retString = TQString((const char *)ASN1_STRING_get0_data(asnGeneralString));
                                        }
                                    }
                                }
                            }
                        }
                        sk_ASN1_TYPE_pop_free(asnSeqValueStack, ASN1_TYPE_free);
                    }
                }
            }
        }
    }
 
    // Clean up
    OBJ_cleanup();
 
    return retString;
#else
    return TQString::null;
#endif
}
 
void TDECryptographicCardDevice::workerRequestedPin(TQString prompt) {
    emit(pinRequested(prompt, this));
}
 
int TDECryptographicCardDevice::decryptDataEncryptedWithCertPublicKey(TQByteArray &ciphertext, TQByteArray &plaintext, TQString *errstr) {
    TQValueList<TQByteArray> cipherTextList;
    TQValueList<TQByteArray> plainTextList;
    TQValueList<int> retCodeList;
 
    cipherTextList.append(ciphertext);
 
    this->decryptDataEncryptedWithCertPublicKey(cipherTextList, plainTextList, retCodeList, errstr);
 
    plaintext = plainTextList[0];
    return retCodeList[0];
}
 
int TDECryptographicCardDevice::decryptDataEncryptedWithCertPublicKey(TQValueList<TQByteArray> &cipherTextList, TQValueList<TQByteArray> &plainTextList, TQValueList<int> &retcodes, TQString *errstr) {
#if defined(WITH_PKCS)
    int ret = -1;
 
    if (!m_watcherObject) {
        if (errstr) *errstr = i18n("Card watcher object not available");
        return -1;
    }
 
    CK_RV rv;
    pkcs11h_certificate_id_list_t issuers;
    pkcs11h_certificate_id_list_t certs;
 
    if (m_watcherObject->initializePkcs() < 0) {
        if (errstr) *errstr = i18n("Unable to initialize PKCS");
        return -1;
    }
 
    rv = pkcs11h_certificate_enumCertificateIds(PKCS11H_ENUM_METHOD_CACHE, NULL, PKCS11H_PROMPT_MASK_ALLOW_PIN_PROMPT, &issuers, &certs);
    if ((rv != CKR_OK) || (certs == NULL)) {
        if (errstr) *errstr = i18n("Cannot enumerate certificates: %1").arg(pkcs11h_getMessage(rv));
        return -1;
    }
 
    int i = 0;
    for (pkcs11h_certificate_id_list_t cert = certs; cert != NULL; cert = cert->next) {
        TQString label = cert->certificate_id->displayName;
 
        pkcs11h_certificate_t certificate;
        rv = pkcs11h_certificate_create(certs->certificate_id, NULL, PKCS11H_PROMPT_MASK_ALLOW_PIN_PROMPT, PKCS11H_PIN_CACHE_INFINITE, &certificate);
        if (rv != CKR_OK) {
            if (errstr) *errstr = i18n("Cannot read certificate: %1").arg(pkcs11h_getMessage(rv));
            pkcs11h_certificate_freeCertificateId(certs->certificate_id);
            ret = -1;
            break;
        }
 
        pkcs11h_certificate_freeCertificateId(certs->certificate_id);
 
        pkcs11h_openssl_session_t openssl_session = NULL;
        if ((openssl_session = pkcs11h_openssl_createSession(certificate)) == NULL) {
            if (errstr) *errstr = i18n("Cannot initialize openssl session to retrieve cryptographic objects");
            pkcs11h_certificate_freeCertificate(certificate);
            ret = -1;
            break;
        }
 
        // Get certificate data
        X509* x509_local;
        x509_local = pkcs11h_openssl_session_getX509(openssl_session);
        if (!x509_local) {
            if (errstr) *errstr = i18n("Cannot get X509 object");
            ret = -1;
        }
 
        // Extract public key from X509 certificate
        EVP_PKEY* x509_pubkey = NULL;
        RSA* rsa_pubkey = NULL;
        x509_pubkey = X509_get_pubkey(x509_local);
        if (x509_pubkey) {
            rsa_pubkey = EVP_PKEY_get1_RSA(x509_pubkey);
        }
 
        // Check PIN
        rv = pkcs11h_certificate_ensureKeyAccess(certificate);
        if (rv != CKR_OK) {
            if (rv == CKR_CANCEL) {
                ret = -3;
                break;
            }
            else if ((rv == CKR_PIN_INCORRECT) || (rv == CKR_USER_NOT_LOGGED_IN)) {
                ret = -2;
                break;
            }
            else {
                ret = -2;
                break;
            }
        }
 
        // We know the cached PIN is correct; disable any further login prompts
        m_watcherObject->retrySamePin(true);
 
        TQValueList<TQByteArray>::iterator it;
        TQValueList<TQByteArray>::iterator it2;
        TQValueList<int>::iterator it3;
        plainTextList.clear();
        retcodes.clear();
        for (it = cipherTextList.begin(); it != cipherTextList.end(); ++it) {
            plainTextList.append(TQByteArray());
            retcodes.append(-1);
        }
        for (it = cipherTextList.begin(), it2 = plainTextList.begin(), it3 = retcodes.begin(); it != cipherTextList.end(); ++it, ++it2, ++it3) {
            TQByteArray& ciphertext = *it;
            TQByteArray& plaintext = *it2;
            int& retcode = *it3;
 
            // Verify minimum size
            if (ciphertext.size() < 16) {
                if (errstr) *errstr = i18n("Cannot decrypt: %1").arg(i18n("Ciphertext too small"));
                ret = -2;
                retcode = -2;
                continue;
            }
 
            // Try to get RSA parameters and verify maximum size
            if (rsa_pubkey) {
                unsigned int rsa_length = RSA_size(rsa_pubkey);
                if (ciphertext.size() > rsa_length) {
                    if (errstr) *errstr = i18n("Cannot decrypt: %1").arg(i18n("Ciphertext too large"));
                    ret = -2;
                    retcode = -2;
                    continue;
                }
            }
 
            size_t size = 0;
            // Determine output buffer size
            rv = pkcs11h_certificate_decryptAny(certificate, CKM_RSA_PKCS, (unsigned char*)ciphertext.data(), ciphertext.size(), NULL, &size);
            if (rv != CKR_OK) {
                if (errstr) *errstr = i18n("Cannot determine decrypted message length: %1 (%2)").arg(pkcs11h_getMessage(rv)).arg(rv);
                if (rv == CKR_CANCEL) {
                    ret = -3;
                    retcode = -3;
                    break;
                }
                else if ((rv == CKR_PIN_INCORRECT) || (rv == CKR_USER_NOT_LOGGED_IN)) {
                    ret = -2;
                    retcode = -2;
                    break;
                }
                else {
                    ret = -2;
                    retcode = -2;
                }
            }
            else {
                // Decrypt data
                plaintext.resize(size);
                rv = pkcs11h_certificate_decryptAny(certificate, CKM_RSA_PKCS, (unsigned char*)ciphertext.data(), ciphertext.size(), (unsigned char*)plaintext.data(), &size);
                if (rv != CKR_OK) {
                    if (errstr) *errstr = i18n("Cannot decrypt: %1 (%2)").arg(pkcs11h_getMessage(rv)).arg(rv);
                    if (rv == CKR_CANCEL) {
                        ret = -3;
                        retcode = -3;
                        break;
                    }
                    else if ((rv == CKR_PIN_INCORRECT) || (rv == CKR_USER_NOT_LOGGED_IN)) {
                        ret = -2;
                        retcode = -2;
                        break;
                    }
                    else {
                        ret = -2;
                        retcode = -2;
                    }
                }
                else {
                    if (errstr) *errstr = TQString::null;
                    ret = 0;
                    retcode = 0;
                }
            }
        }
 
        pkcs11h_openssl_freeSession(openssl_session);
 
        // Only interested in first certificate for now
        // FIXME
        // If cards with multiple certificates are used this should be modified to try decryption
        // using each certificate in turn...
        break;
 
        i++;
    }
    pkcs11h_certificate_freeCertificateIdList(issuers);
 
    // Restore normal login attempt method
    m_watcherObject->retrySamePin(false);
 
    return ret;
#else
    return -1;
#endif
}
 
int TDECryptographicCardDevice::createNewSecretRSAKeyFromCertificate(TQByteArray &plaintext, TQByteArray &ciphertext, X509* certificate) {
#if defined(WITH_PKCS)
    unsigned int i;
    int retcode = -1;
 
    // Extract public key from X509 certificate
    EVP_PKEY* x509_pubkey = NULL;
    RSA* rsa_pubkey = NULL;
    x509_pubkey = X509_get_pubkey(certificate);
    if (x509_pubkey) {
        rsa_pubkey = EVP_PKEY_get1_RSA(x509_pubkey);
    }
 
    if (rsa_pubkey) {
        // Determine encryption parameters
        // NOTE
        // RSA_PKCS1_OAEP_PADDING is preferred but cannot be decoded from
        // the command line via openssl at this time of this writing.
        int rsa_padding_style = RSA_PKCS1_PADDING;
        unsigned int rsa_length = RSA_size(rsa_pubkey);
        unsigned int max_key_length = rsa_length - 41;
 
        // Create a new random key as the plaintext
        plaintext.resize(max_key_length);
        for (i=0; i < max_key_length; i++) {
            plaintext[i] = TDEApplication::random();
        }
 
        // Encrypt data
        ciphertext.resize(rsa_length);
        if (RSA_public_encrypt(plaintext.size(), (unsigned char *)plaintext.data(), (unsigned char *)ciphertext.data(), rsa_pubkey, rsa_padding_style) < 0) {
            retcode = -2;
        }
 
        // Success!
        retcode = 0;
    }
 
    // Clean up
    if (rsa_pubkey) {
        RSA_free(rsa_pubkey);
    }
    if (x509_pubkey) {
        EVP_PKEY_free(x509_pubkey);
    }
 
    return retcode;
#else
    return -1;
#endif
}
 
TQString TDECryptographicCardDevice::pkcsProviderLibrary() {
#if defined(WITH_PKCS)
    return OPENSC_PKCS11_PROVIDER_LIBRARY;
#else
    return TQString::null;
#endif
}
 
#include "tdecryptographiccarddevice.moc"
#include "tdecryptographiccarddevice_private.moc"