mirror of
https://github.com/vgough/encfs.git
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7e95ff90c8
git-svn-id: http://encfs.googlecode.com/svn/trunk@95 db9cf616-1c43-0410-9cb8-a902689de0d6
503 lines
12 KiB
C++
503 lines
12 KiB
C++
/*****************************************************************************
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* Author: Valient Gough <vgough@pobox.com>
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*
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*****************************************************************************
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* Copyright (c) 2007-2013, Valient Gough
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "cipher/openssl.h"
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#include <cstring>
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#include <ctime>
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#include <pthread.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#include <glog/logging.h>
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#include "base/config.h"
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#define NO_DES
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#include <openssl/ssl.h>
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#include <openssl/rand.h>
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#ifndef OPENSSL_NO_ENGINE
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#include <openssl/engine.h>
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#endif
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#include <openssl/blowfish.h>
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#include <openssl/err.h>
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#include <openssl/hmac.h>
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#include <openssl/rand.h>
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#include <openssl/sha.h>
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#include "base/Error.h"
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#include "base/i18n.h"
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#include "base/Mutex.h"
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#include "base/Range.h"
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#include "cipher/BlockCipher.h"
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#include "cipher/MAC.h"
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#include "cipher/MemoryPool.h"
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#include "cipher/PBKDF.h"
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#include "cipher/StreamCipher.h"
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using namespace std;
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namespace encfs {
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const int MAX_KEYLENGTH = 64; // in bytes (256 bit)
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const int MAX_IVLENGTH = 16;
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const int KEY_CHECKSUM_BYTES = 4;
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#ifndef MIN
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inline int MIN(int a, int b)
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{
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return (a < b) ? a : b;
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}
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#endif
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// Base for {Block,Stream}Cipher implementation.
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class OpenSSLCipher : public BlockCipher {
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public:
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OpenSSLCipher() {
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EVP_CIPHER_CTX_init( &enc );
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EVP_CIPHER_CTX_init( &dec );
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}
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virtual ~OpenSSLCipher() {
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EVP_CIPHER_CTX_cleanup( &enc );
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EVP_CIPHER_CTX_cleanup( &dec );
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}
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bool rekey(const EVP_CIPHER *cipher, const CipherKey &key) {
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VLOG(1) << "setting key length " << key.size();
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EVP_EncryptInit_ex( &enc, cipher, NULL, NULL, NULL);
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EVP_CIPHER_CTX_set_key_length( &enc, key.size() );
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EVP_CIPHER_CTX_set_padding( &enc, 0 );
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EVP_EncryptInit_ex( &enc, NULL, NULL, key.data(), NULL);
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EVP_DecryptInit_ex( &dec, cipher, NULL, NULL, NULL);
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EVP_CIPHER_CTX_set_key_length( &dec, key.size() );
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EVP_CIPHER_CTX_set_padding( &dec, 0 );
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EVP_DecryptInit_ex( &dec, NULL, NULL, key.data(), NULL);
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return true;
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}
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static bool randomize(CipherKey *key) {
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int result = RAND_bytes( key->data(), key->size() );
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if(result != 1)
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{
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char errStr[120]; // specs require string at least 120 bytes long..
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unsigned long errVal = 0;
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if((errVal = ERR_get_error()) != 0)
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LOG(ERROR) << "openssl error: " << ERR_error_string( errVal, errStr );
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return false;
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}
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return true;
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}
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static bool pseudoRandomize(byte *out, int length) {
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int result = RAND_pseudo_bytes( out, length );
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if(result != 1)
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{
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char errStr[120]; // specs require string at least 120 bytes long..
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unsigned long errVal = 0;
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if((errVal = ERR_get_error()) != 0)
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LOG(ERROR) << "openssl error: " << ERR_error_string( errVal, errStr );
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return false;
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}
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return true;
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}
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// Rekey with random key.
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bool rekey(const EVP_CIPHER *cipher, int keyLength) {
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CipherKey key(keyLength);
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if (!randomize(&key))
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return false;
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return rekey(cipher, key);
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}
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virtual int blockSize() const {
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return EVP_CIPHER_CTX_block_size(&enc);
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}
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virtual bool encrypt(const byte *ivec, const byte *in,
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byte *out, int size) {
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int dstLen = 0, tmpLen = 0;
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EVP_EncryptInit_ex( &enc, NULL, NULL, NULL, ivec);
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EVP_EncryptUpdate( &enc, out, &dstLen, in, size);
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EVP_EncryptFinal_ex( &enc, out+dstLen, &tmpLen );
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dstLen += tmpLen;
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if (dstLen != size) {
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LOG(ERROR) << "encoding " << size
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<< " bytes, got back " << dstLen << " (" << tmpLen << " in final_ex)";
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return false;
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}
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return true;
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}
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virtual bool decrypt(const byte *ivec, const byte *in,
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byte *out, int size) {
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int dstLen = 0, tmpLen = 0;
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EVP_DecryptInit_ex( &dec, NULL, NULL, NULL, ivec);
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EVP_DecryptUpdate( &dec, out, &dstLen, in, size );
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EVP_DecryptFinal_ex( &dec, out+dstLen, &tmpLen );
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dstLen += tmpLen;
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if (dstLen != size) {
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LOG(ERROR) << "decoding " << size
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<< " bytes, got back " << dstLen << " (" << tmpLen << " in final_ex)";
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return false;
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}
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return true;
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}
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private:
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EVP_CIPHER_CTX enc;
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EVP_CIPHER_CTX dec;
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};
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#if defined(HAVE_EVP_BF)
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static Range BfKeyRange(128,256,32);
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class BfCbcBlockCipher : public OpenSSLCipher {
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public:
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BfCbcBlockCipher() {}
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virtual ~BfCbcBlockCipher() {}
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virtual bool setKey(const CipherKey &key) {
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if (BfKeyRange.allowed(key.size() * 8))
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return rekey(EVP_bf_cbc(), key);
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else
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return false;
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}
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static Properties GetProperties() {
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Properties props;
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props.keySize = BfKeyRange;
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props.cipher = "Blowfish";
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props.mode = "CBC";
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props.library = "OpenSSL";
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return props;
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}
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};
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REGISTER_CLASS(BfCbcBlockCipher, BlockCipher);
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class BfCfbStreamCipher : public OpenSSLCipher {
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public:
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BfCfbStreamCipher() {}
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virtual ~BfCfbStreamCipher() {}
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virtual bool setKey(const CipherKey &key) {
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return BfKeyRange.allowed(key.size() * 8) && rekey(EVP_bf_cfb(), key);
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}
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static Properties GetProperties() {
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Properties props;
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props.keySize = BfKeyRange;
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props.cipher = "Blowfish";
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props.mode = "CFB";
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props.library = "OpenSSL";
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return props;
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}
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};
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REGISTER_CLASS(BfCfbStreamCipher, StreamCipher);
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#endif
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#if defined(HAVE_EVP_AES)
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static Range AesKeyRange(128,256,64);
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class AesCbcBlockCipher : public OpenSSLCipher {
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public:
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AesCbcBlockCipher() {}
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virtual ~AesCbcBlockCipher() {}
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virtual bool setKey(const CipherKey& key) {
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const EVP_CIPHER *cipher = getCipher(key.size());
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return (cipher != NULL) && rekey(cipher, key);
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}
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static const EVP_CIPHER *getCipher(int keyLength) {
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switch(keyLength * 8)
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{
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case 128: return EVP_aes_128_cbc();
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case 192: return EVP_aes_192_cbc();
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case 256: return EVP_aes_256_cbc();
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default:
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LOG(INFO) << "Unsupported key length: " << keyLength;
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return NULL;
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}
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}
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static Properties GetProperties() {
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Properties props;
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props.keySize = AesKeyRange;
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props.cipher = "AES";
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props.mode = "CBC";
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props.library = "OpenSSL";
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return props;
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}
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};
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REGISTER_CLASS(AesCbcBlockCipher, BlockCipher);
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class AesCfbStreamCipher : public OpenSSLCipher {
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public:
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AesCfbStreamCipher() {}
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virtual ~AesCfbStreamCipher() {}
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virtual bool setKey(const CipherKey& key) {
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const EVP_CIPHER *cipher = getCipher(key.size());
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return (cipher != NULL) && rekey(cipher, key);
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}
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static const EVP_CIPHER *getCipher(int keyLength) {
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switch(keyLength * 8)
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{
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case 128: return EVP_aes_128_cfb();
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case 192: return EVP_aes_192_cfb();
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case 256: return EVP_aes_256_cfb();
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default:
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LOG(INFO) << "Unsupported key length: " << keyLength;
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return NULL;
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}
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}
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static Properties GetProperties() {
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Properties props;
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props.keySize = AesKeyRange;
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props.cipher = "AES";
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props.mode = "CFB";
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props.library = "OpenSSL";
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return props;
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}
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};
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REGISTER_CLASS(AesCfbStreamCipher, StreamCipher);
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#endif
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#if defined(HAVE_EVP_AES_XTS)
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static Range AesXtsKeyRange(128,256,128);
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class AesXtsBlockCipher : public OpenSSLCipher {
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public:
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AesXtsBlockCipher() {}
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virtual ~AesXtsBlockCipher() {}
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virtual bool setKey(const CipherKey &key) {
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const EVP_CIPHER *cipher = getCipher(key.size());
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return (cipher != NULL) && rekey(cipher, key);
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}
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static const EVP_CIPHER *getCipher(int keyLength) {
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switch(keyLength * 8)
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{
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case 128: return EVP_aes_128_xts();
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case 256: return EVP_aes_256_xts();
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default: return NULL;
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}
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}
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static Properties GetProperties() {
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Properties props;
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props.keySize = AesXtsKeyRange;
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props.cipher = "AES";
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props.mode = "XTS";
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props.library = "OpenSSL";
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return props;
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}
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};
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REGISTER_CLASS(AesXtsBlockCipher, BlockCipher);
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#endif
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class Sha1HMac : public MAC {
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public:
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Sha1HMac() {
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HMAC_CTX_init(&ctx);
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}
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virtual ~Sha1HMac() {
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HMAC_CTX_cleanup(&ctx);
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}
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virtual int outputSize() const {
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return 20; // 160 bit.
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}
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virtual bool setKey(const CipherKey &key) {
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HMAC_Init_ex(&ctx, key.data(), key.size(), EVP_sha1(), 0);
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return true;
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}
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virtual void reset() {
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HMAC_Init_ex(&ctx, 0, 0, 0, 0);
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}
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virtual bool update(const byte *in, int length) {
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HMAC_Update(&ctx, in, length);
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return true;
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}
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virtual bool write(byte *out) {
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#ifdef HAVE_VALGRIND_MEMCHECK_H
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if (VALGRIND_CHECK_MEM_IS_ADDRESSABLE(out, 20) != 0) {
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return false;
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}
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#endif
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unsigned int outSize = 0;
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HMAC_Final(&ctx, (unsigned char *)out, &outSize);
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CHECK_EQ(outputSize(), outSize) << "Invalid HMAC output size";
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return true;
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}
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static Properties GetProperties() {
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Properties props;
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props.blockSize = 20;
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props.hashFunction = "SHA-1";
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props.mode = "HMAC";
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props.library = "OpenSSL";
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return props;
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}
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private:
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HMAC_CTX ctx;
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};
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REGISTER_CLASS(Sha1HMac, MAC);
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class PbkdfPkcs5HmacSha1 : public PBKDF {
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public:
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PbkdfPkcs5HmacSha1() {}
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virtual ~PbkdfPkcs5HmacSha1() {}
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virtual bool makeKey(const char *password, int passwordLength,
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const byte *salt, int saltLength,
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int numIterations,
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CipherKey *outKey) {
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return PKCS5_PBKDF2_HMAC_SHA1(
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password, passwordLength,
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const_cast<byte *>(salt), saltLength,
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numIterations, outKey->size(), outKey->data()) == 1;
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}
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virtual CipherKey randomKey(int length) {
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CipherKey key(length);
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if (!OpenSSLCipher::randomize(&key))
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key.reset();
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return key;
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}
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virtual bool pseudoRandom(byte *out, int length) {
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return OpenSSLCipher::pseudoRandomize(out, length);
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}
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static Properties GetProperties() {
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Properties props;
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props.mode = NAME_PKCS5_PBKDF2_HMAC_SHA1;
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props.library = "OpenSSL";
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return props;
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}
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};
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REGISTER_CLASS(PbkdfPkcs5HmacSha1, PBKDF);
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unsigned long pthreads_thread_id()
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{
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return (unsigned long)pthread_self();
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}
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static pthread_mutex_t *crypto_locks = NULL;
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void pthreads_locking_callback( int mode, int n,
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const char *caller_file, int caller_line )
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{
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(void)caller_file;
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(void)caller_line;
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if(!crypto_locks)
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{
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VLOG(1) << "Allocating " << CRYPTO_num_locks() << " locks for OpenSSL";
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crypto_locks = new pthread_mutex_t[ CRYPTO_num_locks() ];
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for(int i=0; i<CRYPTO_num_locks(); ++i)
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pthread_mutex_init( crypto_locks+i, 0 );
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}
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if(mode & CRYPTO_LOCK)
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{
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pthread_mutex_lock( crypto_locks + n );
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} else
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{
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pthread_mutex_unlock( crypto_locks + n );
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}
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}
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void pthreads_locking_cleanup()
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{
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if(crypto_locks)
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{
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for(int i=0; i<CRYPTO_num_locks(); ++i)
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pthread_mutex_destroy( crypto_locks+i );
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delete[] crypto_locks;
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crypto_locks = NULL;
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}
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}
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void OpenSSL::init(bool threaded)
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{
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// initialize the SSL library
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SSL_load_error_strings();
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SSL_library_init();
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unsigned int randSeed = 0;
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RAND_bytes( (unsigned char*)&randSeed, sizeof(randSeed) );
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srand( randSeed );
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#ifndef OPENSSL_NO_ENGINE
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/* Load all bundled ENGINEs into memory and make them visible */
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ENGINE_load_builtin_engines();
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/* Register all of them for every algorithm they collectively implement */
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ENGINE_register_all_complete();
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#endif // NO_ENGINE
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if(threaded)
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{
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// provide locking functions to OpenSSL since we'll be running with
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// threads accessing openssl in parallel.
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CRYPTO_set_id_callback( pthreads_thread_id );
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CRYPTO_set_locking_callback( pthreads_locking_callback );
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}
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}
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void OpenSSL::shutdown(bool threaded)
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{
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#ifndef OPENSSL_NO_ENGINE
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ENGINE_cleanup();
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#endif
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if(threaded)
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pthreads_locking_cleanup();
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}
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void OpenSSL::registerCiphers()
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{
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// Nothing required.. Just need to reference this code block to get static
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// initializers.
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}
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} // namespace encfs
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