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CryptoManager.cpp
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CryptoManager.cpp
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/*
* Copyright (C) 2001-2012 Jacek Sieka, arnetheduck on gmail point com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "stdinc.h"
#include "CryptoManager.h"
#include <boost/scoped_array.hpp>
#include "File.h"
#include "LogManager.h"
#include "ClientManager.h"
#include "version.h"
#include <openssl/bn.h>
#include <bzlib.h>
namespace dcpp {
CryptoManager::CryptoManager()
:
certsLoaded(false),
lock("EXTENDEDPROTOCOLABCABCABCABCABCABC"),
pk("DCPLUSPLUS" VERSIONSTRING)
{
SSL_library_init();
clientContext.reset(SSL_CTX_new(TLSv1_client_method()));
clientVerContext.reset(SSL_CTX_new(TLSv1_client_method()));
serverContext.reset(SSL_CTX_new(TLSv1_server_method()));
serverVerContext.reset(SSL_CTX_new(TLSv1_server_method()));
if(clientContext && clientVerContext && serverContext && serverVerContext) {
dh.reset(DH_new());
static unsigned char dh4096_p[]={
0xCA,0x35,0xA8,0xBB,0x65,0x33,0x28,0xC6,0x3F,0xD7,0x21,0x55,
0x95,0xDF,0xC0,0xDC,0x11,0x10,0x23,0x2D,0x1E,0xD6,0x52,0x23,
0xA1,0x52,0xB8,0xDD,0x4A,0x25,0xEE,0xF4,0x78,0xB6,0x89,0x9E,
0xB6,0x33,0xEB,0x01,0xA6,0x46,0x31,0xD8,0x3D,0x12,0xB4,0x7B,
0x1F,0x64,0x0C,0x84,0x10,0x80,0xFB,0x4F,0x74,0x21,0xA3,0x9B,
0xF5,0x97,0xD1,0x05,0x97,0x9D,0x52,0x4F,0x91,0x3C,0xE1,0xA8,
0x97,0xE0,0x33,0x9D,0xCB,0x9D,0x9D,0x2A,0xB5,0x3E,0xF5,0x8D,
0x7F,0xEE,0x91,0xEE,0x4E,0xC5,0xA6,0xAB,0x54,0xD9,0xC2,0xA5,
0x0D,0x2E,0xEA,0x1A,0x39,0xFD,0x30,0x4A,0x1C,0xB7,0x34,0x2B,
0x7D,0x51,0xF6,0xB1,0xD1,0x8D,0xCE,0x28,0xDC,0xF9,0xDE,0x34,
0xAF,0x1E,0xD1,0x7C,0xC2,0xD3,0x38,0x8E,0xBD,0x35,0x01,0x53,
0xDD,0x2E,0xB5,0x83,0xC8,0xEF,0x08,0x15,0x59,0x6E,0xA3,0xC4,
0x71,0x57,0x8C,0x4D,0xFD,0xA7,0x19,0x40,0x88,0x68,0x4E,0xD6,
0x8F,0x5C,0xE5,0xEC,0xCF,0x5F,0xEB,0x9A,0xA4,0x66,0x40,0x8B,
0x02,0x87,0xA7,0x3A,0x58,0x81,0xF1,0x6A,0x14,0x16,0x75,0x7D,
0x33,0x01,0xEB,0x3F,0xA8,0x02,0xDC,0x09,0x32,0x12,0x00,0x20,
0x47,0xFF,0x01,0x14,0xFE,0x9E,0x3A,0x44,0x4D,0xED,0x85,0xD5,
0xDA,0x2F,0xE3,0x99,0xCE,0xDA,0x84,0x64,0xCB,0x0C,0x8C,0x00,
0x90,0x19,0x70,0x1C,0x00,0x1D,0x63,0x3C,0x77,0x16,0x8D,0x3D,
0x86,0x97,0x22,0x23,0x2F,0x7B,0xAB,0xB8,0xEB,0x94,0xA4,0x01,
0xAA,0x34,0xBA,0xEA,0x7D,0x7A,0x37,0xB7,0x0C,0x75,0xEB,0x00,
0x8D,0x52,0x7A,0xE2,0xDF,0x78,0x7C,0x4F,0x54,0x9E,0xA4,0xDD,
0xC9,0xFC,0x08,0x7C,0x45,0x70,0x43,0x0F,0x39,0xE3,0x7E,0x48,
0xB8,0xDC,0x9D,0xEC,0xB9,0x51,0x29,0x86,0x29,0x60,0xF6,0x4F,
0xF7,0xCA,0xDD,0x3B,0x7F,0xAE,0xE2,0x54,0x4C,0x53,0x42,0x55,
0xC0,0x39,0x24,0xE1,0x1A,0xAD,0x9E,0xCC,0x75,0x5E,0xF1,0xE2,
0xD6,0xAE,0xCD,0x9A,0x91,0xC3,0x7B,0xE5,0x29,0xAD,0xCA,0xC2,
0x00,0xC1,0xF9,0xF4,0x6D,0xD2,0x4B,0xD4,0x5A,0x56,0x39,0xCD,
0xAC,0xCA,0xE7,0xD1,0x8C,0x15,0x4D,0x2B,0x59,0x67,0x29,0x72,
0xE7,0x40,0x14,0x81,0x9E,0x26,0x48,0xF8,0x6C,0x51,0xF5,0xBE,
0x64,0xD1,0xF4,0x4D,0x98,0xE7,0xFD,0x5E,0x23,0x1E,0xDF,0xBA,
0xBD,0x2E,0xB1,0x81,0x26,0x98,0x9C,0x2F,0xE8,0xD5,0x32,0x6B,
0x94,0x91,0x8C,0x2E,0xB8,0xD9,0xC9,0x2F,0x22,0x9D,0xA6,0x52,
0x02,0xDF,0x99,0x63,0x64,0x7E,0xB8,0x68,0xAB,0x17,0x54,0x7E,
0xED,0x9E,0xD1,0x45,0x64,0x36,0x65,0xE8,0x09,0x50,0xAB,0xB0,
0xD4,0x8C,0x79,0x9F,0x4C,0xB8,0x26,0x45,0xBE,0x0F,0xDE,0x14,
0x6F,0xEC,0x70,0x21,0x1A,0xA0,0x1D,0xD0,0x7D,0xA2,0x0F,0x85,
0xA5,0x7C,0xC1,0x0A,0x74,0xB1,0x7B,0x5A,0xD2,0xC4,0x0F,0xD5,
0x90,0x24,0x3E,0xEC,0x89,0x7E,0xB8,0xED,0x6E,0x19,0x85,0xB9,
0x58,0x36,0xA1,0x33,0x7D,0x14,0xFE,0x4F,0x55,0xA9,0xB6,0x42,
0x7E,0x97,0x2A,0x96,0x50,0x14,0x0D,0xEA,0x02,0xB1,0xD2,0x22,
0xEB,0xE7,0xF4,0xAC,0xB6,0x37,0xCA,0xAB,0x4A,0x1E,0x4D,0x4E,
0xCF,0xFE,0x5D,0xEF,0x23,0x78,0xC6,0xBB,
};
static unsigned char dh4096_g[]={
0x02,
};
if(dh) {
dh->p = BN_bin2bn(dh4096_p, sizeof(dh4096_p), 0);
dh->g = BN_bin2bn(dh4096_g, sizeof(dh4096_g), 0);
if (!dh->p || !dh->g) {
dh.reset();
} else {
SSL_CTX_set_options(serverContext, SSL_OP_SINGLE_DH_USE);
SSL_CTX_set_options(serverVerContext, SSL_OP_SINGLE_DH_USE);
SSL_CTX_set_tmp_dh(serverContext, (DH*)dh);
SSL_CTX_set_tmp_dh(serverVerContext, (DH*)dh);
}
}
SSL_CTX_set_verify(serverContext, SSL_VERIFY_NONE, 0);
SSL_CTX_set_verify(clientContext, SSL_VERIFY_NONE, 0);
SSL_CTX_set_verify(clientVerContext, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, 0);
SSL_CTX_set_verify(serverVerContext, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, 0);
}
}
CryptoManager::~CryptoManager() {
}
bool CryptoManager::TLSOk() const noexcept {
return BOOLSETTING(USE_TLS) && certsLoaded && !keyprint.empty();
}
void CryptoManager::generateCertificate() {
// Generate certificate using OpenSSL
if(SETTING(TLS_PRIVATE_KEY_FILE).empty()) {
throw CryptoException(_("No private key file chosen"));
}
if(SETTING(TLS_CERTIFICATE_FILE).empty()) {
throw CryptoException(_("No certificate file chosen"));
}
ssl::BIGNUM bn(BN_new());
ssl::RSA rsa(RSA_new());
ssl::EVP_PKEY pkey(EVP_PKEY_new());
ssl::X509_NAME nm(X509_NAME_new());
const EVP_MD *digest = EVP_sha1();
ssl::X509 x509ss(X509_new());
ssl::ASN1_INTEGER serial(ASN1_INTEGER_new());
if(!bn || !rsa || !pkey || !nm || !x509ss || !serial) {
throw CryptoException(_("Error generating certificate"));
}
int days = 10;
int keylength = 2048;
#define CHECK(n) if(!(n)) { throw CryptoException(#n); }
// Generate key pair
CHECK((BN_set_word(bn, RSA_F4)))
CHECK((RSA_generate_key_ex(rsa, keylength, bn, NULL)))
CHECK((EVP_PKEY_set1_RSA(pkey, rsa)))
// Set CID
CHECK((X509_NAME_add_entry_by_txt(nm, "CN", MBSTRING_ASC,
(const unsigned char*)ClientManager::getInstance()->getMyCID().toBase32().c_str(), -1, -1, 0)))
// Prepare self-signed cert
ASN1_INTEGER_set(serial, (long)Util::rand());
CHECK((X509_set_serialNumber(x509ss, serial)))
CHECK((X509_set_issuer_name(x509ss, nm)))
CHECK((X509_set_subject_name(x509ss, nm)))
CHECK((X509_gmtime_adj(X509_get_notBefore(x509ss), 0)))
CHECK((X509_gmtime_adj(X509_get_notAfter(x509ss), (long)60*60*24*days)))
CHECK((X509_set_pubkey(x509ss, pkey)))
// Sign using own private key
CHECK((X509_sign(x509ss, pkey, digest)))
#undef CHECK
// Write the key and cert
{
File::ensureDirectory(SETTING(TLS_PRIVATE_KEY_FILE));
FILE* f = fopen(SETTING(TLS_PRIVATE_KEY_FILE).c_str(), "w");
if(!f) {
return;
}
PEM_write_RSAPrivateKey(f, rsa, NULL, NULL, 0, NULL, NULL);
fclose(f);
}
{
File::ensureDirectory(SETTING(TLS_CERTIFICATE_FILE));
FILE* f = fopen(SETTING(TLS_CERTIFICATE_FILE).c_str(), "w");
if(!f) {
File::deleteFile(SETTING(TLS_PRIVATE_KEY_FILE));
return;
}
PEM_write_X509(f, x509ss);
fclose(f);
}
}
void CryptoManager::loadCertificates() noexcept {
if(!BOOLSETTING(USE_TLS) || !clientContext || !clientVerContext || !serverContext || !serverVerContext)
return;
keyprint.clear();
certsLoaded = false;
const string& cert = SETTING(TLS_CERTIFICATE_FILE);
const string& key = SETTING(TLS_PRIVATE_KEY_FILE);
if(cert.empty() || key.empty()) {
LogManager::getInstance()->message(_("TLS disabled, no certificate file set"));
return;
}
if(File::getSize(cert) == -1 || File::getSize(key) == -1 || !checkCertificate()) {
// Try to generate them...
try {
generateCertificate();
LogManager::getInstance()->message(_("Generated new TLS certificate"));
} catch(const CryptoException& e) {
LogManager::getInstance()->message(str(F_("TLS disabled, failed to generate certificate: %1%") % e.getError()));
}
}
if(SSL_CTX_use_certificate_file(serverContext, cert.c_str(), SSL_FILETYPE_PEM) != SSL_SUCCESS) {
LogManager::getInstance()->message(_("Failed to load certificate file"));
return;
}
if(SSL_CTX_use_certificate_file(clientContext, cert.c_str(), SSL_FILETYPE_PEM) != SSL_SUCCESS) {
LogManager::getInstance()->message(_("Failed to load certificate file"));
return;
}
if(SSL_CTX_use_certificate_file(serverVerContext, cert.c_str(), SSL_FILETYPE_PEM) != SSL_SUCCESS) {
LogManager::getInstance()->message(_("Failed to load certificate file"));
return;
}
if(SSL_CTX_use_certificate_file(clientVerContext, cert.c_str(), SSL_FILETYPE_PEM) != SSL_SUCCESS) {
LogManager::getInstance()->message(_("Failed to load certificate file"));
return;
}
if(SSL_CTX_use_PrivateKey_file(serverContext, key.c_str(), SSL_FILETYPE_PEM) != SSL_SUCCESS) {
LogManager::getInstance()->message(_("Failed to load private key"));
return;
}
if(SSL_CTX_use_PrivateKey_file(clientContext, key.c_str(), SSL_FILETYPE_PEM) != SSL_SUCCESS) {
LogManager::getInstance()->message(_("Failed to load private key"));
return;
}
if(SSL_CTX_use_PrivateKey_file(serverVerContext, key.c_str(), SSL_FILETYPE_PEM) != SSL_SUCCESS) {
LogManager::getInstance()->message(_("Failed to load private key"));
return;
}
if(SSL_CTX_use_PrivateKey_file(clientVerContext, key.c_str(), SSL_FILETYPE_PEM) != SSL_SUCCESS) {
LogManager::getInstance()->message(_("Failed to load private key"));
return;
}
StringList certs = File::findFiles(SETTING(TLS_TRUSTED_CERTIFICATES_PATH), "*.pem");
StringList certs2 = File::findFiles(SETTING(TLS_TRUSTED_CERTIFICATES_PATH), "*.crt");
certs.insert(certs.end(), certs2.begin(), certs2.end());
for(auto i = certs.begin(); i != certs.end(); ++i) {
if(
SSL_CTX_load_verify_locations(clientContext, i->c_str(), NULL) != SSL_SUCCESS ||
SSL_CTX_load_verify_locations(clientVerContext, i->c_str(), NULL) != SSL_SUCCESS ||
SSL_CTX_load_verify_locations(serverContext, i->c_str(), NULL) != SSL_SUCCESS ||
SSL_CTX_load_verify_locations(serverVerContext, i->c_str(), NULL) != SSL_SUCCESS
) {
LogManager::getInstance()->message("Failed to load trusted certificate from " + *i);
}
}
loadKeyprint(cert);
certsLoaded = true;
}
bool CryptoManager::checkCertificate() noexcept {
FILE* f = fopen(SETTING(TLS_CERTIFICATE_FILE).c_str(), "r");
if(!f) {
return false;
}
X509* tmpx509 = NULL;
PEM_read_X509(f, &tmpx509, NULL, NULL);
fclose(f);
if(!tmpx509) {
return false;
}
ssl::X509 x509(tmpx509);
ASN1_INTEGER* sn = X509_get_serialNumber(x509);
if(!sn || !ASN1_INTEGER_get(sn)) {
return false;
}
X509_NAME* name = X509_get_subject_name(x509);
if(!name) {
return false;
}
int i = X509_NAME_get_index_by_NID(name, NID_commonName, -1);
if(i == -1) {
return false;
}
X509_NAME_ENTRY* entry = X509_NAME_get_entry(name, i);
ASN1_STRING* str = X509_NAME_ENTRY_get_data(entry);
if(!str) {
return false;
}
unsigned char* buf = 0;
i = ASN1_STRING_to_UTF8(&buf, str);
if(i < 0) {
return false;
}
std::string cn((char*)buf, i);
OPENSSL_free(buf);
if(cn != ClientManager::getInstance()->getMyCID().toBase32()) {
return false;
}
ASN1_TIME* t = X509_get_notAfter(x509);
if(t) {
if(X509_cmp_current_time(t) < 0) {
return false;
}
}
return true;
}
const vector<uint8_t>& CryptoManager::getKeyprint() const noexcept {
return keyprint;
}
void CryptoManager::loadKeyprint(const string& file) noexcept {
FILE* f = fopen(SETTING(TLS_CERTIFICATE_FILE).c_str(), "r");
if(!f) {
return;
}
X509* tmpx509 = NULL;
PEM_read_X509(f, &tmpx509, NULL, NULL);
fclose(f);
if(!tmpx509) {
return;
}
ssl::X509 x509(tmpx509);
keyprint = ssl::X509_digest(x509, EVP_sha256());
}
SSLSocket* CryptoManager::getClientSocket(bool allowUntrusted) {
return new SSLSocket(allowUntrusted ? clientContext : clientVerContext);
}
SSLSocket* CryptoManager::getServerSocket(bool allowUntrusted) {
return new SSLSocket(allowUntrusted ? serverContext : serverVerContext);
}
void CryptoManager::decodeBZ2(const uint8_t* is, size_t sz, string& os) {
bz_stream bs = { 0 };
if(BZ2_bzDecompressInit(&bs, 0, 0) != BZ_OK)
throw CryptoException(_("Error during decompression"));
// We assume that the files aren't compressed more than 2:1...if they are it'll work anyway,
// but we'll have to do multiple passes...
size_t bufsize = 2*sz;
boost::scoped_array<char> buf(new char[bufsize]);
bs.avail_in = sz;
bs.avail_out = bufsize;
bs.next_in = reinterpret_cast<char*>(const_cast<uint8_t*>(is));
bs.next_out = &buf[0];
int err;
os.clear();
while((err = BZ2_bzDecompress(&bs)) == BZ_OK) {
if (bs.avail_in == 0 && bs.avail_out > 0) { // error: BZ_UNEXPECTED_EOF
BZ2_bzDecompressEnd(&bs);
throw CryptoException(_("Error during decompression"));
}
os.append(&buf[0], bufsize-bs.avail_out);
bs.avail_out = bufsize;
bs.next_out = &buf[0];
}
if(err == BZ_STREAM_END)
os.append(&buf[0], bufsize-bs.avail_out);
BZ2_bzDecompressEnd(&bs);
if(err < 0) {
// This was a real error
throw CryptoException(_("Error during decompression"));
}
}
string CryptoManager::keySubst(const uint8_t* aKey, size_t len, size_t n) {
boost::scoped_array<uint8_t> temp(new uint8_t[len + n * 10]);
size_t j=0;
for(size_t i = 0; i<len; i++) {
if(isExtra(aKey[i])) {
temp[j++] = '/'; temp[j++] = '%'; temp[j++] = 'D';
temp[j++] = 'C'; temp[j++] = 'N';
switch(aKey[i]) {
case 0: temp[j++] = '0'; temp[j++] = '0'; temp[j++] = '0'; break;
case 5: temp[j++] = '0'; temp[j++] = '0'; temp[j++] = '5'; break;
case 36: temp[j++] = '0'; temp[j++] = '3'; temp[j++] = '6'; break;
case 96: temp[j++] = '0'; temp[j++] = '9'; temp[j++] = '6'; break;
case 124: temp[j++] = '1'; temp[j++] = '2'; temp[j++] = '4'; break;
case 126: temp[j++] = '1'; temp[j++] = '2'; temp[j++] = '6'; break;
}
temp[j++] = '%'; temp[j++] = '/';
} else {
temp[j++] = aKey[i];
}
}
return string((const char*)&temp[0], j);
}
string CryptoManager::makeKey(const string& aLock) {
if(aLock.size() < 3)
return Util::emptyString;
boost::scoped_array<uint8_t> temp(new uint8_t[aLock.length()]);
uint8_t v1;
size_t extra=0;
v1 = (uint8_t)(aLock[0]^5);
v1 = (uint8_t)(((v1 >> 4) | (v1 << 4)) & 0xff);
temp[0] = v1;
string::size_type i;
for(i = 1; i<aLock.length(); i++) {
v1 = (uint8_t)(aLock[i]^aLock[i-1]);
v1 = (uint8_t)(((v1 >> 4) | (v1 << 4))&0xff);
temp[i] = v1;
if(isExtra(temp[i]))
extra++;
}
temp[0] = (uint8_t)(temp[0] ^ temp[aLock.length()-1]);
if(isExtra(temp[0])) {
extra++;
}
return keySubst(&temp[0], aLock.length(), extra);
}
} // namespace dcpp