ksmimecrypto.cc
/* This file is part of the KDE project
*
* Copyright (C) 2003 Stefan Rompf <sux@loplof.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* 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.
*/
#include <qptrlist.h>
#include <qcstring.h>
#include <qstring.h>
#include <kdebug.h>
#include "kopenssl.h"
#include "ksslcertificate.h"
#include "ksslpkcs12.h"
#include "ksmimecrypto.h"
// this hack provided by Malte Starostik to avoid glibc/openssl bug
// on some systems
#ifdef KSSL_HAVE_SSL
#define crypt _openssl_crypt
#include <openssl/err.h>
#undef crypt
#endif
// forward included macros to KOpenSSLProxy
#define sk_new kossl->sk_new
#define sk_free kossl->sk_free
#define sk_push kossl->sk_push
#define sk_value kossl->sk_value
#define sk_num kossl->sk_num
#define BIO_ctrl kossl->BIO_ctrl
#ifdef KSSL_HAVE_SSL
static const char eot = 0;
class KSMIMECryptoPrivate {
KOpenSSLProxy *kossl;
public:
KSMIMECryptoPrivate(KOpenSSLProxy *kossl);
STACK_OF(X509) *certsToX509(QPtrList<KSSLCertificate> &certs);
KSMIMECrypto::rc signMessage(BIO *clearText,
BIO *cipherText,
KSSLPKCS12 &privKey, QPtrList<KSSLCertificate> &certs,
bool detached);
KSMIMECrypto::rc encryptMessage(BIO *clearText,
BIO *cipherText, KSMIMECrypto::algo algorithm,
QPtrList<KSSLCertificate> &recip);
KSMIMECrypto::rc checkSignature(BIO *clearText,
BIO *signature, bool detached,
QPtrList<KSSLCertificate> &recip);
KSMIMECrypto::rc decryptMessage(BIO *cipherText,
BIO *clearText,
KSSLPKCS12 &privKey);
void MemBIOToQByteArray(BIO *src, QByteArray &dest);
KSMIMECrypto::rc sslErrToRc(void);
};
KSMIMECryptoPrivate::KSMIMECryptoPrivate(KOpenSSLProxy *kossl): kossl(kossl) {
}
STACK_OF(X509) *KSMIMECryptoPrivate::certsToX509(QPtrList<KSSLCertificate> &certs) {
STACK_OF(X509) *x509 = sk_new(NULL);
KSSLCertificate *cert = certs.first();
while(cert) {
sk_X509_push(x509, cert->getCert());
cert = certs.next();
}
return x509;
}
KSMIMECrypto::rc KSMIMECryptoPrivate::signMessage(BIO *clearText,
BIO *cipherText,
KSSLPKCS12 &privKey, QPtrList<KSSLCertificate> &certs,
bool detached) {
STACK_OF(X509) *other = NULL;
KSMIMECrypto::rc rc;
int flags = detached?PKCS7_DETACHED:0;
if (certs.count()) other = certsToX509(certs);
PKCS7 *p7 = kossl->PKCS7_sign(privKey.getCertificate()->getCert(), privKey.getPrivateKey(),
other, clearText, flags);
if (other) sk_X509_free(other);
if (!p7) return sslErrToRc();
if (kossl->i2d_PKCS7_bio(cipherText, p7)) {
rc = KSMIMECrypto::KSC_R_OK;
} else {
rc = sslErrToRc();
}
kossl->PKCS7_free(p7);
return rc;
}
KSMIMECrypto::rc KSMIMECryptoPrivate::encryptMessage(BIO *clearText,
BIO *cipherText, KSMIMECrypto::algo algorithm,
QPtrList<KSSLCertificate> &recip) {
EVP_CIPHER *cipher = NULL;
KSMIMECrypto::rc rc;
switch(algorithm) {
case KSMIMECrypto::KSC_C_DES3_CBC:
cipher = kossl->EVP_des_ede3_cbc();
break;
case KSMIMECrypto::KSC_C_RC2_CBC_128:
cipher = kossl->EVP_rc2_cbc();
break;
case KSMIMECrypto::KSC_C_RC2_CBC_64:
cipher = kossl->EVP_rc2_64_cbc();
break;
case KSMIMECrypto::KSC_C_DES_CBC:
cipher = kossl->EVP_des_cbc();
break;
case KSMIMECrypto::KSC_C_RC2_CBC_40:
cipher = kossl->EVP_rc2_40_cbc();
break;
}
if (!cipher) return KSMIMECrypto::KSC_R_NOCIPHER;
STACK_OF(X509) *certs = certsToX509(recip);
PKCS7 *p7 = kossl->PKCS7_encrypt(certs, clearText, cipher, 0);
sk_X509_free(certs);
if (!p7) return sslErrToRc();
if (kossl->i2d_PKCS7_bio(cipherText, p7)) {
rc = KSMIMECrypto::KSC_R_OK;
} else {
rc = sslErrToRc();
}
kossl->PKCS7_free(p7);
return rc;
}
KSMIMECrypto::rc KSMIMECryptoPrivate::checkSignature(BIO *clearText,
BIO *signature, bool detached,
QPtrList<KSSLCertificate> &recip) {
PKCS7 *p7 = kossl->d2i_PKCS7_bio(signature, NULL);
KSMIMECrypto::rc rc = KSMIMECrypto::KSC_R_OTHER;
if (!p7) return sslErrToRc();
BIO *in;
BIO *out;
if (detached) {
in = clearText;
out = NULL;
} else {
in = NULL;
out = clearText;
}
X509_STORE *dummystore = kossl->X509_STORE_new();
if (kossl->PKCS7_verify(p7, NULL, dummystore, in, out, PKCS7_NOVERIFY)) {
STACK_OF(X509) *signers = kossl->PKCS7_get0_signers(p7, 0, PKCS7_NOVERIFY);
int num = sk_X509_num(signers);
for(int n=0; n<num; n++) {
KSSLCertificate *signer = KSSLCertificate::fromX509(sk_X509_value(signers, n));
recip.append(signer);
}
sk_X509_free(signers);
rc = KSMIMECrypto::KSC_R_OK;
} else {
rc = sslErrToRc();
}
kossl->X509_STORE_free(dummystore);
kossl->PKCS7_free(p7);
return rc;
}
KSMIMECrypto::rc KSMIMECryptoPrivate::decryptMessage(BIO *cipherText,
BIO *clearText,
KSSLPKCS12 &privKey) {
PKCS7 *p7 = kossl->d2i_PKCS7_bio(cipherText, NULL);
KSMIMECrypto::rc rc;
if (!p7) return sslErrToRc();
if (kossl->PKCS7_decrypt(p7, privKey.getPrivateKey(), privKey.getCertificate()->getCert(),
clearText, 0)) {
rc = KSMIMECrypto::KSC_R_OK;
} else {
rc = sslErrToRc();
}
kossl->PKCS7_free(p7);
return rc;
}
void KSMIMECryptoPrivate::MemBIOToQByteArray(BIO *src, QByteArray &dest) {
char *buf;
long len = BIO_get_mem_data(src, &buf);
dest.assign(buf, len);
/* Now this goes quite a bit into openssl internals.
We assume that openssl uses malloc() (it does in
default config) and rip out the buffer.
*/
reinterpret_cast<BUF_MEM *>(src->ptr)->data = NULL;
}
KSMIMECrypto::rc KSMIMECryptoPrivate::sslErrToRc(void) {
unsigned long cerr = kossl->ERR_get_error();
// To be completed and possibly fixed
switch(ERR_GET_REASON(cerr)) {
case ERR_R_MALLOC_FAILURE:
return KSMIMECrypto::KSC_R_NOMEM;
}
switch(ERR_GET_LIB(cerr)) {
case ERR_LIB_PKCS7:
switch(ERR_GET_REASON(cerr)) {
case PKCS7_R_WRONG_CONTENT_TYPE:
case PKCS7_R_NO_CONTENT:
case PKCS7_R_NO_SIGNATURES_ON_DATA:
return KSMIMECrypto::KSC_R_FORMAT;
break;
case PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE:
case PKCS7_R_DECRYPT_ERROR: // Hmm?
return KSMIMECrypto::KSC_R_WRONGKEY;
break;
case PKCS7_R_DIGEST_FAILURE:
return KSMIMECrypto::KSC_R_VERIFY;
default:
break;
}
break;
default:
break;
}
kdDebug(7029) <<"KSMIMECrypto: uncaught error " <<ERR_GET_LIB(cerr)
<<" " <<ERR_GET_REASON(cerr) <<endl;
return KSMIMECrypto::KSC_R_OTHER;
}
#endif
KSMIMECrypto::KSMIMECrypto() {
#ifdef KSSL_HAVE_SSL
kossl = KOpenSSLProxy::self();
priv = new KSMIMECryptoPrivate(kossl);
if (!kossl->hasLibCrypto()) kossl = 0L;
#else
kossl = 0L;
#endif
}
KSMIMECrypto::~KSMIMECrypto() {
#ifdef KSSL_HAVE_SSL
delete priv;
#endif
}
KSMIMECrypto::rc KSMIMECrypto::signMessage(const QCString &clearText,
QByteArray &cipherText,
const KSSLPKCS12 &privKey,
const QPtrList<KSSLCertificate> &certs,
bool detached) {
#ifdef KSSL_HAVE_SSL
if (!kossl) return KSC_R_NO_SSL;
BIO *in = kossl->BIO_new_mem_buf((char *)clearText.data(), clearText.size());
BIO *out = kossl->BIO_new(kossl->BIO_s_mem());
rc rc = priv->signMessage(in, out,
const_cast<KSSLPKCS12 &>(privKey),
const_cast<QPtrList<KSSLCertificate> &>(certs),
detached);
if (!rc) priv->MemBIOToQByteArray(out, cipherText);
kossl->BIO_free(out);
kossl->BIO_free(in);
return rc;
#else
return KSC_R_NO_SSL;
#endif
}
KSMIMECrypto::rc KSMIMECrypto::checkDetachedSignature(const QCString &clearText,
const QByteArray &signature,
QPtrList<KSSLCertificate> &foundCerts) {
#ifdef KSSL_HAVE_SSL
if (!kossl) return KSC_R_NO_SSL;
BIO *txt = kossl->BIO_new_mem_buf((char *)clearText.data(), clearText.length());
BIO *sig = kossl->BIO_new_mem_buf((char *)signature.data(), signature.size());
rc rc = priv->checkSignature(txt, sig, true, foundCerts);
kossl->BIO_free(sig);
kossl->BIO_free(txt);
return rc;
#else
return KSC_R_NO_SSL;
#endif
}
KSMIMECrypto::rc KSMIMECrypto::checkOpaqueSignature(const QByteArray &signedText,
QCString &clearText,
QPtrList<KSSLCertificate> &foundCerts) {
#ifdef KSSL_HAVE_SSL
if (!kossl) return KSC_R_NO_SSL;
BIO *in = kossl->BIO_new_mem_buf((char *)signedText.data(), signedText.size());
BIO *out = kossl->BIO_new(kossl->BIO_s_mem());
rc rc = priv->checkSignature(out, in, false, foundCerts);
kossl->BIO_write(out, &eot, 1);
priv->MemBIOToQByteArray(out, clearText);
kossl->BIO_free(out);
kossl->BIO_free(in);
return rc;
#else
return KSC_R_NO_SSL;
#endif
}
KSMIMECrypto::rc KSMIMECrypto::encryptMessage(const QCString &clearText,
QByteArray &cipherText,
algo algorithm,
const QPtrList<KSSLCertificate> &recip) {
#ifdef KSSL_HAVE_SSL
if (!kossl) return KSC_R_NO_SSL;
BIO *in = kossl->BIO_new_mem_buf((char *)clearText.data(), clearText.size());
BIO *out = kossl->BIO_new(kossl->BIO_s_mem());
rc rc = priv->encryptMessage(in,out,algorithm,
const_cast< QPtrList<KSSLCertificate> &>(recip));
if (!rc) priv->MemBIOToQByteArray(out, cipherText);
kossl->BIO_free(out);
kossl->BIO_free(in);
return rc;
#else
return KSC_R_NO_SSL;
#endif
}
KSMIMECrypto::rc KSMIMECrypto::decryptMessage(const QByteArray &cipherText,
QCString &clearText,
const KSSLPKCS12 &privKey) {
#ifdef KSSL_HAVE_SSL
if (!kossl) return KSC_R_NO_SSL;
BIO *in = kossl->BIO_new_mem_buf((char *)cipherText.data(), cipherText.size());
BIO *out = kossl->BIO_new(kossl->BIO_s_mem());
rc rc = priv->decryptMessage(in,out,
const_cast<KSSLPKCS12 &>(privKey));
kossl->BIO_write(out, &eot, 1);
priv->MemBIOToQByteArray(out, clearText);
kossl->BIO_free(out);
kossl->BIO_free(in);
return rc;
#else
return KSC_R_NO_SSL;
#endif
}
KSSLCertificate
KDE X.509 Certificate.
Definition: ksslcertificate.h:75
KOpenSSLProxy
Dynamically load and wrap OpenSSL.
Definition: kopenssl.h:63
KSSLPKCS12
KDE PKCS#12 Certificate.
Definition: ksslpkcs12.h:61
KSSLCertificate::fromX509
static KSSLCertificate * fromX509(X509 *x5)
Create an X.509 certificate from the internal representation.
Definition: ksslcertificate.cc:132
KSSLPKCS12::getPrivateKey
EVP_PKEY * getPrivateKey()
Get the private key.
Definition: ksslpkcs12.cc:186
KSSLPKCS12::getCertificate
KSSLCertificate * getCertificate()
Get the X.509 certificate.
Definition: ksslpkcs12.cc:191
KOpenSSLProxy::self
static KOpenSSLProxy * self()
Return an instance of class KOpenSSLProxy * You cannot delete this object.
Definition: kopenssl.cc:631

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