307 lines
9.2 KiB
C++
307 lines
9.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include <config.h>
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#include <assert.h>
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#include "Ssl.hpp"
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#include <sys/syscall.h>
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#include <Util.hpp>
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extern "C"
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{
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// Multithreading support for OpenSSL.
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// Not needed in recent (1.x?) versions.
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struct CRYPTO_dynlock_value
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{
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std::mutex Mutex;
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};
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}
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#define DEFAULT_CIPHER_SET "ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH"
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std::unique_ptr<SslContext> SslContext::Instance(nullptr);
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SslContext::SslContext(const std::string& certFilePath,
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const std::string& keyFilePath,
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const std::string& caFilePath,
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const std::string& cipherList) :
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_ctx(nullptr)
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{
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const std::vector<char> rand = Util::rng::getBytes(512);
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RAND_seed(&rand[0], rand.size());
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// Initialize multi-threading support.
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for (int x = 0; x < CRYPTO_num_locks(); ++x)
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{
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_mutexes.emplace_back(new std::mutex);
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}
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#if OPENSSL_VERSION_NUMBER >= 0x0907000L && OPENSSL_VERSION_NUMBER < 0x10100003L
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OPENSSL_config(nullptr);
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#endif
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#if OPENSSL_VERSION_NUMBER >= 0x10100003L
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OPENSSL_init_ssl(OPENSSL_INIT_LOAD_CONFIG, nullptr);
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#else
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SSL_library_init();
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SSL_load_error_strings();
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OpenSSL_add_all_algorithms();
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#endif
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CRYPTO_set_locking_callback(&SslContext::lock);
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CRYPTO_set_id_callback(&SslContext::id);
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CRYPTO_set_dynlock_create_callback(&SslContext::dynlockCreate);
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CRYPTO_set_dynlock_lock_callback(&SslContext::dynlock);
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CRYPTO_set_dynlock_destroy_callback(&SslContext::dynlockDestroy);
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// Create the Context. We only have one,
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// as we don't expect/support different servers in same process.
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#if OPENSSL_VERSION_NUMBER >= 0x10100000L
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_ctx = SSL_CTX_new(TLS_server_method());
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#else
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_ctx = SSL_CTX_new(SSLv23_server_method());
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#endif
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// SSL_CTX_set_default_passwd_cb(_ctx, &privateKeyPassphraseCallback);
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ERR_clear_error();
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SSL_CTX_set_options(_ctx, SSL_OP_ALL);
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try
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{
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int errCode = 0;
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if (!caFilePath.empty())
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{
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errCode = SSL_CTX_load_verify_locations(_ctx, caFilePath.c_str(), 0);
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if (errCode != 1)
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{
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std::string msg = getLastErrorMsg();
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throw std::runtime_error(std::string("Cannot load CA file/directory at ") + caFilePath + " (" + msg + ")");
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}
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}
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if (!keyFilePath.empty())
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{
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errCode = SSL_CTX_use_PrivateKey_file(_ctx, keyFilePath.c_str(), SSL_FILETYPE_PEM);
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if (errCode != 1)
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{
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std::string msg = getLastErrorMsg();
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throw std::runtime_error(std::string("Error loading private key from file ") + keyFilePath + " (" + msg + ")");
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}
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}
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if (!certFilePath.empty())
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{
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errCode = SSL_CTX_use_certificate_chain_file(_ctx, certFilePath.c_str());
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if (errCode != 1)
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{
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std::string msg = getLastErrorMsg();
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throw std::runtime_error(std::string("Error loading certificate from file ") + certFilePath + " (" + msg + ")");
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}
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}
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SSL_CTX_set_verify(_ctx, SSL_VERIFY_NONE, nullptr /*&verifyServerCallback*/);
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std::string ciphers(cipherList);
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if (ciphers.empty())
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ciphers = DEFAULT_CIPHER_SET;
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SSL_CTX_set_cipher_list(_ctx, ciphers.c_str());
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SSL_CTX_set_verify_depth(_ctx, 9);
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// The write buffer may re-allocate, and we don't mind partial writes.
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SSL_CTX_set_mode(_ctx, SSL_MODE_ENABLE_PARTIAL_WRITE |
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SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
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SSL_CTX_set_session_cache_mode(_ctx, SSL_SESS_CACHE_OFF);
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initDH();
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initECDH();
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}
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catch (...)
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{
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SSL_CTX_free(_ctx);
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_ctx = nullptr;
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throw;
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}
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}
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SslContext::~SslContext()
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{
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SSL_CTX_free(_ctx);
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EVP_cleanup();
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ERR_free_strings();
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CRYPTO_set_locking_callback(0);
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CRYPTO_set_id_callback(0);
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CONF_modules_free();
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_mutexes.clear();
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}
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void SslContext::uninitialize()
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{
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assert (Instance);
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Instance.reset();
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}
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void SslContext::lock(int mode, int n, const char* /*file*/, int /*line*/)
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{
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assert(n < CRYPTO_num_locks());
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if (Instance)
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{
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if (mode & CRYPTO_LOCK)
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{
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Instance->_mutexes[n]->lock();
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}
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else
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{
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Instance->_mutexes[n]->unlock();
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}
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}
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}
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unsigned long SslContext::id()
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{
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return syscall(SYS_gettid);
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}
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CRYPTO_dynlock_value* SslContext::dynlockCreate(const char* /*file*/, int /*line*/)
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{
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return new CRYPTO_dynlock_value;
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}
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void SslContext::dynlock(int mode, struct CRYPTO_dynlock_value* lock, const char* /*file*/, int /*line*/)
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{
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if (mode & CRYPTO_LOCK)
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{
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lock->Mutex.lock();
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}
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else
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{
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lock->Mutex.unlock();
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}
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}
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void SslContext::dynlockDestroy(struct CRYPTO_dynlock_value* lock, const char* /*file*/, int /*line*/)
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{
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delete lock;
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}
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void SslContext::initDH()
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{
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#ifndef OPENSSL_NO_DH
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// 1024-bit MODP Group with 160-bit prime order subgroup (RFC5114)
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// -----BEGIN DH PARAMETERS-----
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// MIIBDAKBgQCxC4+WoIDgHd6S3l6uXVTsUsmfvPsGo8aaap3KUtI7YWBz4oZ1oj0Y
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// mDjvHi7mUsAT7LSuqQYRIySXXDzUm4O/rMvdfZDEvXCYSI6cIZpzck7/1vrlZEc4
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// +qMaT/VbzMChUa9fDci0vUW/N982XBpl5oz9p21NpwjfH7K8LkpDcQKBgQCk0cvV
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// w/00EmdlpELvuZkF+BBN0lisUH/WQGz/FCZtMSZv6h5cQVZLd35pD1UE8hMWAhe0
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// sBuIal6RVH+eJ0n01/vX07mpLuGQnQ0iY/gKdqaiTAh6CR9THb8KAWm2oorWYqTR
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// jnOvoy13nVkY0IvIhY9Nzvl8KiSFXm7rIrOy5QICAKA=
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// -----END DH PARAMETERS-----
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//
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static const unsigned char dh1024_p[] =
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{
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0xB1,0x0B,0x8F,0x96,0xA0,0x80,0xE0,0x1D,0xDE,0x92,0xDE,0x5E,
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0xAE,0x5D,0x54,0xEC,0x52,0xC9,0x9F,0xBC,0xFB,0x06,0xA3,0xC6,
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0x9A,0x6A,0x9D,0xCA,0x52,0xD2,0x3B,0x61,0x60,0x73,0xE2,0x86,
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0x75,0xA2,0x3D,0x18,0x98,0x38,0xEF,0x1E,0x2E,0xE6,0x52,0xC0,
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0x13,0xEC,0xB4,0xAE,0xA9,0x06,0x11,0x23,0x24,0x97,0x5C,0x3C,
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0xD4,0x9B,0x83,0xBF,0xAC,0xCB,0xDD,0x7D,0x90,0xC4,0xBD,0x70,
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0x98,0x48,0x8E,0x9C,0x21,0x9A,0x73,0x72,0x4E,0xFF,0xD6,0xFA,
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0xE5,0x64,0x47,0x38,0xFA,0xA3,0x1A,0x4F,0xF5,0x5B,0xCC,0xC0,
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0xA1,0x51,0xAF,0x5F,0x0D,0xC8,0xB4,0xBD,0x45,0xBF,0x37,0xDF,
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0x36,0x5C,0x1A,0x65,0xE6,0x8C,0xFD,0xA7,0x6D,0x4D,0xA7,0x08,
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0xDF,0x1F,0xB2,0xBC,0x2E,0x4A,0x43,0x71,
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};
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static const unsigned char dh1024_g[] =
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{
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0xA4,0xD1,0xCB,0xD5,0xC3,0xFD,0x34,0x12,0x67,0x65,0xA4,0x42,
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0xEF,0xB9,0x99,0x05,0xF8,0x10,0x4D,0xD2,0x58,0xAC,0x50,0x7F,
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0xD6,0x40,0x6C,0xFF,0x14,0x26,0x6D,0x31,0x26,0x6F,0xEA,0x1E,
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0x5C,0x41,0x56,0x4B,0x77,0x7E,0x69,0x0F,0x55,0x04,0xF2,0x13,
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0x16,0x02,0x17,0xB4,0xB0,0x1B,0x88,0x6A,0x5E,0x91,0x54,0x7F,
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0x9E,0x27,0x49,0xF4,0xD7,0xFB,0xD7,0xD3,0xB9,0xA9,0x2E,0xE1,
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0x90,0x9D,0x0D,0x22,0x63,0xF8,0x0A,0x76,0xA6,0xA2,0x4C,0x08,
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0x7A,0x09,0x1F,0x53,0x1D,0xBF,0x0A,0x01,0x69,0xB6,0xA2,0x8A,
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0xD6,0x62,0xA4,0xD1,0x8E,0x73,0xAF,0xA3,0x2D,0x77,0x9D,0x59,
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0x18,0xD0,0x8B,0xC8,0x85,0x8F,0x4D,0xCE,0xF9,0x7C,0x2A,0x24,
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0x85,0x5E,0x6E,0xEB,0x22,0xB3,0xB2,0xE5,
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};
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DH* dh = DH_new();
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if (!dh)
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{
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std::string msg = getLastErrorMsg();
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throw std::runtime_error("Error creating Diffie-Hellman parameters: " + msg);
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}
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#if OPENSSL_VERSION_NUMBER >= 0x10100003L
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// OpenSSL v1.1.0 has public API changes
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// p, g and length of the Diffie-Hellman param can't be set directly anymore,
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// instead DH_set0_pqg and DH_set_length are used
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BIGNUM* p = BN_bin2bn(dh1024_p, sizeof(dh1024_p), 0);
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BIGNUM* g = BN_bin2bn(dh1024_g, sizeof(dh1024_g), 0);
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if ((DH_set0_pqg(dh, p, NULL, g) == 0) || (DH_set_length(dh, 160) == 0))
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#else
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dh->p = BN_bin2bn(dh1024_p, sizeof(dh1024_p), 0);
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dh->g = BN_bin2bn(dh1024_g, sizeof(dh1024_g), 0);
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dh->length = 160;
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if ((!dh->p) || (!dh->g))
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#endif
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{
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DH_free(dh);
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throw std::runtime_error("Error creating Diffie-Hellman parameters");
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}
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SSL_CTX_set_tmp_dh(_ctx, dh);
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SSL_CTX_set_options(_ctx, SSL_OP_SINGLE_DH_USE);
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DH_free(dh);
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#endif
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}
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void SslContext::initECDH()
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{
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#if OPENSSL_VERSION_NUMBER >= 0x0090800fL
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#ifndef OPENSSL_NO_ECDH
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const int nid = OBJ_sn2nid("prime256v1");
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if (nid == 0)
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{
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throw std::runtime_error("Unknown ECDH curve name: prime256v1");
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}
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EC_KEY* ecdh = EC_KEY_new_by_curve_name(nid);
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if (!ecdh)
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{
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throw std::runtime_error("Cannot create ECDH curve");
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}
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SSL_CTX_set_tmp_ecdh(_ctx, ecdh);
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SSL_CTX_set_options(_ctx, SSL_OP_SINGLE_ECDH_USE);
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EC_KEY_free(ecdh);
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#endif
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#endif
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}
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std::string SslContext::getLastErrorMsg()
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{
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const unsigned long errCode = ERR_get_error();
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if (errCode != 0)
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{
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char buf[256];
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ERR_error_string_n(errCode, buf, sizeof(buf));
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return std::string(buf);
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}
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return "Success";
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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