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icinga2/lib/base/tlsutility.cpp

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/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012-2016 Icinga Development Team (https://www.icinga.org/) *
* *
* 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 St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
#include "base/tlsutility.hpp"
#include "base/convert.hpp"
#include "base/logger.hpp"
#include "base/context.hpp"
#include "base/utility.hpp"
#include "base/application.hpp"
#include "base/exception.hpp"
#include <fstream>
namespace icinga
{
static bool l_SSLInitialized = false;
static boost::mutex *l_Mutexes;
#ifdef CRYPTO_LOCK
static void OpenSSLLockingCallback(int mode, int type, const char *, int)
{
if (mode & CRYPTO_LOCK)
l_Mutexes[type].lock();
else
l_Mutexes[type].unlock();
}
static unsigned long OpenSSLIDCallback(void)
{
#ifdef _WIN32
return (unsigned long)GetCurrentThreadId();
#else /* _WIN32 */
return (unsigned long)pthread_self();
#endif /* _WIN32 */
}
#endif /* CRYPTO_LOCK */
/**
* Initializes the OpenSSL library.
*/
void InitializeOpenSSL(void)
{
if (l_SSLInitialized)
return;
SSL_library_init();
SSL_load_error_strings();
SSL_COMP_get_compression_methods();
#ifdef CRYPTO_LOCK
l_Mutexes = new boost::mutex[CRYPTO_num_locks()];
CRYPTO_set_locking_callback(&OpenSSLLockingCallback);
CRYPTO_set_id_callback(&OpenSSLIDCallback);
#endif /* CRYPTO_LOCK */
l_SSLInitialized = true;
}
/**
* Initializes an SSL context using the specified certificates.
*
* @param pubkey The public key.
* @param privkey The matching private key.
* @param cakey CA certificate chain file.
* @returns An SSL context.
*/
boost::shared_ptr<SSL_CTX> MakeSSLContext(const String& pubkey, const String& privkey, const String& cakey)
{
char errbuf[120];
InitializeOpenSSL();
boost::shared_ptr<SSL_CTX> sslContext = boost::shared_ptr<SSL_CTX>(SSL_CTX_new(SSLv23_method()), SSL_CTX_free);
long flags = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | SSL_OP_CIPHER_SERVER_PREFERENCE;
#ifdef SSL_OP_NO_COMPRESSION
flags |= SSL_OP_NO_COMPRESSION;
#endif /* SSL_OP_NO_COMPRESSION */
SSL_CTX_set_options(sslContext.get(), flags);
SSL_CTX_set_mode(sslContext.get(), SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
SSL_CTX_set_session_id_context(sslContext.get(), (const unsigned char *)"Icinga 2", 8);
if (!pubkey.IsEmpty()) {
if (!SSL_CTX_use_certificate_chain_file(sslContext.get(), pubkey.CStr())) {
Log(LogCritical, "SSL")
<< "Error with public key file '" << pubkey << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("SSL_CTX_use_certificate_chain_file")
<< errinfo_openssl_error(ERR_peek_error())
<< boost::errinfo_file_name(pubkey));
}
}
if (!privkey.IsEmpty()) {
if (!SSL_CTX_use_PrivateKey_file(sslContext.get(), privkey.CStr(), SSL_FILETYPE_PEM)) {
Log(LogCritical, "SSL")
<< "Error with private key file '" << privkey << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("SSL_CTX_use_PrivateKey_file")
<< errinfo_openssl_error(ERR_peek_error())
<< boost::errinfo_file_name(privkey));
}
if (!SSL_CTX_check_private_key(sslContext.get())) {
Log(LogCritical, "SSL")
<< "Error checking private key '" << privkey << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("SSL_CTX_check_private_key")
<< errinfo_openssl_error(ERR_peek_error()));
}
}
if (!cakey.IsEmpty()) {
if (!SSL_CTX_load_verify_locations(sslContext.get(), cakey.CStr(), NULL)) {
Log(LogCritical, "SSL")
<< "Error loading and verifying locations in ca key file '" << cakey << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("SSL_CTX_load_verify_locations")
<< errinfo_openssl_error(ERR_peek_error())
<< boost::errinfo_file_name(cakey));
}
STACK_OF(X509_NAME) *cert_names;
cert_names = SSL_load_client_CA_file(cakey.CStr());
if (cert_names == NULL) {
Log(LogCritical, "SSL")
<< "Error loading client ca key file '" << cakey << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("SSL_load_client_CA_file")
<< errinfo_openssl_error(ERR_peek_error())
<< boost::errinfo_file_name(cakey));
}
SSL_CTX_set_client_CA_list(sslContext.get(), cert_names);
}
return sslContext;
}
/**
* Set the cipher list to the specified SSL context.
* @param context The ssl context.
* @param cipherList The ciper list.
**/
void SetCipherListToSSLContext(const boost::shared_ptr<SSL_CTX>& context, const String& cipherList)
{
char errbuf[256];
if (SSL_CTX_set_cipher_list(context.get(), cipherList.CStr()) == 0) {
Log(LogCritical, "SSL")
<< "Error with cipher list '"
<< cipherList
<< "' results in no availabe ciphers: "
<< ERR_peek_error() << ", \""
<< ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("SSL_CTX_set_cipher_list")
<< errinfo_openssl_error(ERR_peek_error()));
}
}
/**
* Loads a CRL and appends its certificates to the specified SSL context.
*
* @param context The SSL context.
* @param crlPath The path to the CRL file.
*/
void AddCRLToSSLContext(const boost::shared_ptr<SSL_CTX>& context, const String& crlPath)
{
char errbuf[120];
X509_STORE *x509_store = SSL_CTX_get_cert_store(context.get());
X509_LOOKUP *lookup;
lookup = X509_STORE_add_lookup(x509_store, X509_LOOKUP_file());
if (!lookup) {
Log(LogCritical, "SSL")
<< "Error adding X509 store lookup: " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("X509_STORE_add_lookup")
<< errinfo_openssl_error(ERR_peek_error()));
}
if (X509_LOOKUP_load_file(lookup, crlPath.CStr(), X509_FILETYPE_PEM) != 0) {
Log(LogCritical, "SSL")
<< "Error loading crl file '" << crlPath << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("X509_LOOKUP_load_file")
<< errinfo_openssl_error(ERR_peek_error())
<< boost::errinfo_file_name(crlPath));
}
X509_VERIFY_PARAM *param = X509_VERIFY_PARAM_new();
X509_VERIFY_PARAM_set_flags(param, X509_V_FLAG_CRL_CHECK);
X509_STORE_set1_param(x509_store, param);
X509_VERIFY_PARAM_free(param);
}
static String GetX509NameCN(X509_NAME *name)
{
char errbuf[120];
char buffer[256];
int rc = X509_NAME_get_text_by_NID(name, NID_commonName, buffer, sizeof(buffer));
if (rc == -1) {
Log(LogCritical, "SSL")
<< "Error with x509 NAME getting text by NID: " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("X509_NAME_get_text_by_NID")
<< errinfo_openssl_error(ERR_peek_error()));
}
return buffer;
}
/**
* Retrieves the common name for an X509 certificate.
*
* @param certificate The X509 certificate.
* @returns The common name.
*/
String GetCertificateCN(const boost::shared_ptr<X509>& certificate)
{
return GetX509NameCN(X509_get_subject_name(certificate.get()));
}
/**
* Retrieves an X509 certificate from the specified file.
*
* @param pemfile The filename.
* @returns An X509 certificate.
*/
boost::shared_ptr<X509> GetX509Certificate(const String& pemfile)
{
char errbuf[120];
X509 *cert;
BIO *fpcert = BIO_new(BIO_s_file());
if (fpcert == NULL) {
Log(LogCritical, "SSL")
<< "Error creating new BIO: " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("BIO_new")
<< errinfo_openssl_error(ERR_peek_error()));
}
if (BIO_read_filename(fpcert, pemfile.CStr()) < 0) {
Log(LogCritical, "SSL")
<< "Error reading pem file '" << pemfile << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("BIO_read_filename")
<< errinfo_openssl_error(ERR_peek_error())
<< boost::errinfo_file_name(pemfile));
}
cert = PEM_read_bio_X509_AUX(fpcert, NULL, NULL, NULL);
if (cert == NULL) {
Log(LogCritical, "SSL")
<< "Error on bio X509 AUX reading pem file '" << pemfile << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("PEM_read_bio_X509_AUX")
<< errinfo_openssl_error(ERR_peek_error())
<< boost::errinfo_file_name(pemfile));
}
BIO_free(fpcert);
return boost::shared_ptr<X509>(cert, X509_free);
}
int MakeX509CSR(const String& cn, const String& keyfile, const String& csrfile, const String& certfile, const String& serialfile, bool ca)
{
char errbuf[120];
InitializeOpenSSL();
RSA *rsa = RSA_generate_key(4096, RSA_F4, NULL, NULL);
Log(LogInformation, "base")
<< "Writing private key to '" << keyfile << "'.";
BIO *bio = BIO_new_file(const_cast<char *>(keyfile.CStr()), "w");
if (!bio) {
Log(LogCritical, "SSL")
<< "Error while opening private RSA key file '" << keyfile << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("BIO_new_file")
<< errinfo_openssl_error(ERR_peek_error())
<< boost::errinfo_file_name(keyfile));
}
if (!PEM_write_bio_RSAPrivateKey(bio, rsa, NULL, NULL, 0, NULL, NULL)) {
Log(LogCritical, "SSL")
<< "Error while writing private RSA key to file '" << keyfile << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("PEM_write_bio_RSAPrivateKey")
<< errinfo_openssl_error(ERR_peek_error())
<< boost::errinfo_file_name(keyfile));
}
BIO_free(bio);
#ifndef _WIN32
chmod(keyfile.CStr(), 0600);
#endif /* _WIN32 */
EVP_PKEY *key = EVP_PKEY_new();
EVP_PKEY_assign_RSA(key, rsa);
if (!certfile.IsEmpty()) {
X509_NAME *subject = X509_NAME_new();
X509_NAME_add_entry_by_txt(subject, "CN", MBSTRING_ASC, (unsigned char *)cn.CStr(), -1, -1, 0);
boost::shared_ptr<X509> cert = CreateCert(key, subject, subject, key, ca, serialfile);
X509_NAME_free(subject);
Log(LogInformation, "base")
<< "Writing X509 certificate to '" << certfile << "'.";
bio = BIO_new_file(const_cast<char *>(certfile.CStr()), "w");
if (!bio) {
Log(LogCritical, "SSL")
<< "Error while opening certificate file '" << certfile << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("BIO_new_file")
<< errinfo_openssl_error(ERR_peek_error())
<< boost::errinfo_file_name(certfile));
}
if (!PEM_write_bio_X509(bio, cert.get())) {
Log(LogCritical, "SSL")
<< "Error while writing certificate to file '" << certfile << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("PEM_write_bio_X509")
<< errinfo_openssl_error(ERR_peek_error())
<< boost::errinfo_file_name(certfile));
}
BIO_free(bio);
}
if (!csrfile.IsEmpty()) {
X509_REQ *req = X509_REQ_new();
if (!req)
return 0;
X509_REQ_set_version(req, 0);
X509_REQ_set_pubkey(req, key);
X509_NAME *name = X509_REQ_get_subject_name(req);
X509_NAME_add_entry_by_txt(name, "CN", MBSTRING_ASC, (unsigned char *)cn.CStr(), -1, -1, 0);
X509_REQ_sign(req, key, EVP_sha256());
Log(LogInformation, "base")
<< "Writing certificate signing request to '" << csrfile << "'.";
bio = BIO_new_file(const_cast<char *>(csrfile.CStr()), "w");
if (!bio) {
Log(LogCritical, "SSL")
<< "Error while opening CSR file '" << csrfile << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("BIO_new_file")
<< errinfo_openssl_error(ERR_peek_error())
<< boost::errinfo_file_name(csrfile));
}
if (!PEM_write_bio_X509_REQ(bio, req)) {
Log(LogCritical, "SSL")
<< "Error while writing CSR to file '" << csrfile << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("PEM_write_bio_X509")
<< errinfo_openssl_error(ERR_peek_error())
<< boost::errinfo_file_name(csrfile));
}
BIO_free(bio);
X509_REQ_free(req);
}
EVP_PKEY_free(key);
return 1;
}
boost::shared_ptr<X509> CreateCert(EVP_PKEY *pubkey, X509_NAME *subject, X509_NAME *issuer, EVP_PKEY *cakey, bool ca, const String& serialfile)
{
X509 *cert = X509_new();
X509_set_version(cert, 2);
X509_gmtime_adj(X509_get_notBefore(cert), 0);
X509_gmtime_adj(X509_get_notAfter(cert), 365 * 24 * 60 * 60 * 15);
X509_set_pubkey(cert, pubkey);
X509_set_subject_name(cert, subject);
X509_set_issuer_name(cert, issuer);
int serial = 1;
if (!serialfile.IsEmpty()) {
if (Utility::PathExists(serialfile)) {
std::ifstream ifp;
ifp.open(serialfile.CStr());
ifp >> std::hex >> serial;
ifp.close();
if (ifp.fail())
BOOST_THROW_EXCEPTION(std::runtime_error("Could not read serial file."));
}
std::ofstream ofp;
ofp.open(serialfile.CStr());
ofp << std::hex << std::setw(2) << std::setfill('0') << serial + 1;
ofp.close();
if (ofp.fail())
BOOST_THROW_EXCEPTION(std::runtime_error("Could not update serial file."));
}
ASN1_INTEGER_set(X509_get_serialNumber(cert), serial);
X509V3_CTX ctx;
X509V3_set_ctx_nodb(&ctx);
X509V3_set_ctx(&ctx, cert, cert, NULL, NULL, 0);
const char *attr;
if (ca)
attr = "critical,CA:TRUE";
else
attr = "critical,CA:FALSE";
X509_EXTENSION *basicConstraintsExt = X509V3_EXT_conf_nid(NULL, &ctx, NID_basic_constraints, const_cast<char *>(attr));
if (basicConstraintsExt) {
X509_add_ext(cert, basicConstraintsExt, -1);
X509_EXTENSION_free(basicConstraintsExt);
}
String cn = GetX509NameCN(subject);
if (!cn.Contains(" ") && cn.Contains(".")) {
String san = "DNS:" + cn;
X509_EXTENSION *subjectAltNameExt = X509V3_EXT_conf_nid(NULL, &ctx, NID_subject_alt_name, const_cast<char *>(san.CStr()));
if (subjectAltNameExt) {
X509_add_ext(cert, subjectAltNameExt, -1);
X509_EXTENSION_free(subjectAltNameExt);
}
}
X509_sign(cert, cakey, EVP_sha256());
return boost::shared_ptr<X509>(cert, X509_free);
}
String GetIcingaCADir(void)
{
return Application::GetLocalStateDir() + "/lib/icinga2/ca";
}
boost::shared_ptr<X509> CreateCertIcingaCA(EVP_PKEY *pubkey, X509_NAME *subject)
{
char errbuf[120];
String cadir = GetIcingaCADir();
String cakeyfile = cadir + "/ca.key";
RSA *rsa;
BIO *cakeybio = BIO_new_file(const_cast<char *>(cakeyfile.CStr()), "r");
if (!cakeybio) {
Log(LogCritical, "SSL")
<< "Could not open CA key file '" << cakeyfile << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
return boost::shared_ptr<X509>();
}
rsa = PEM_read_bio_RSAPrivateKey(cakeybio, NULL, NULL, NULL);
if (!rsa) {
Log(LogCritical, "SSL")
<< "Could not read RSA key from CA key file '" << cakeyfile << "': " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
return boost::shared_ptr<X509>();
}
BIO_free(cakeybio);
String cacertfile = cadir + "/ca.crt";
boost::shared_ptr<X509> cacert = GetX509Certificate(cacertfile);
EVP_PKEY *privkey = EVP_PKEY_new();
EVP_PKEY_assign_RSA(privkey, rsa);
return CreateCert(pubkey, subject, X509_get_subject_name(cacert.get()), privkey, false, cadir + "/serial.txt");
}
String CertificateToString(const boost::shared_ptr<X509>& cert)
{
BIO *mem = BIO_new(BIO_s_mem());
PEM_write_bio_X509(mem, cert.get());
char *data;
long len = BIO_get_mem_data(mem, &data);
String result = String(data, data + len);
BIO_free(mem);
return result;
}
String PBKDF2_SHA1(const String& password, const String& salt, int iterations)
{
unsigned char digest[SHA_DIGEST_LENGTH];
PKCS5_PBKDF2_HMAC_SHA1(password.CStr(), password.GetLength(), reinterpret_cast<const unsigned char *>(salt.CStr()), salt.GetLength(),
iterations, sizeof(digest), digest);
char output[SHA_DIGEST_LENGTH*2+1];
for (int i = 0; i < SHA_DIGEST_LENGTH; i++)
sprintf(output + 2 * i, "%02x", digest[i]);
return output;
}
String SHA256(const String& s)
{
char errbuf[120];
SHA256_CTX context;
unsigned char digest[SHA256_DIGEST_LENGTH];
if (!SHA256_Init(&context)) {
Log(LogCritical, "SSL")
<< "Error on SHA256 Init: " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("SHA256_Init")
<< errinfo_openssl_error(ERR_peek_error()));
}
if (!SHA256_Update(&context, (unsigned char*)s.CStr(), s.GetLength())) {
Log(LogCritical, "SSL")
<< "Error on SHA256 Update: " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("SHA256_Update")
<< errinfo_openssl_error(ERR_peek_error()));
}
if (!SHA256_Final(digest, &context)) {
Log(LogCritical, "SSL")
<< "Error on SHA256 Final: " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("SHA256_Final")
<< errinfo_openssl_error(ERR_peek_error()));
}
char output[SHA256_DIGEST_LENGTH*2+1];
for (int i = 0; i < 32; i++)
sprintf(output + 2 * i, "%02x", digest[i]);
return output;
}
String RandomString(int length)
{
unsigned char *bytes = new unsigned char[length];
if (!RAND_bytes(bytes, length)) {
delete [] bytes;
char errbuf[120];
Log(LogCritical, "SSL")
<< "Error for RAND_bytes: " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("RAND_bytes")
<< errinfo_openssl_error(ERR_peek_error()));
}
char *output = new char[length * 2 + 1];
for (int i = 0; i < length; i++)
sprintf(output + 2 * i, "%02x", bytes[i]);
String result = output;
delete [] bytes;
delete [] output;
return result;
}
}
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