396 lines
11 KiB
C++
396 lines
11 KiB
C++
/*
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* s3fs - FUSE-based file system backed by Amazon S3
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*
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* Copyright(C) 2007 Randy Rizun <rrizun@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <cerrno>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <pthread.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <gcrypt.h>
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#include <gnutls/gnutls.h>
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#include <gnutls/crypto.h>
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#ifdef USE_GNUTLS_NETTLE
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#include <nettle/md5.h>
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#include <nettle/sha1.h>
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#include <nettle/hmac.h>
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#endif
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#include <string>
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#include <map>
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#include "common.h"
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#include "s3fs.h"
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#include "s3fs_auth.h"
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#include "s3fs_logger.h"
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//-------------------------------------------------------------------
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// Utility Function for version
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//-------------------------------------------------------------------
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#ifdef USE_GNUTLS_NETTLE
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const char* s3fs_crypt_lib_name(void)
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{
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static constexpr char version[] = "GnuTLS(nettle)";
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return version;
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}
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#else // USE_GNUTLS_NETTLE
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const char* s3fs_crypt_lib_name()
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{
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static constexpr char version[] = "GnuTLS(gcrypt)";
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return version;
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}
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#endif // USE_GNUTLS_NETTLE
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//-------------------------------------------------------------------
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// Utility Function for global init
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//-------------------------------------------------------------------
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bool s3fs_init_global_ssl()
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{
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if(GNUTLS_E_SUCCESS != gnutls_global_init()){
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return false;
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}
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#ifndef USE_GNUTLS_NETTLE
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if(nullptr == gcry_check_version(nullptr)){
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return false;
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}
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#endif // USE_GNUTLS_NETTLE
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return true;
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}
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bool s3fs_destroy_global_ssl()
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{
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gnutls_global_deinit();
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return true;
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}
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//-------------------------------------------------------------------
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// Utility Function for crypt lock
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//-------------------------------------------------------------------
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bool s3fs_init_crypt_mutex()
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{
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return true;
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}
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bool s3fs_destroy_crypt_mutex()
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{
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return true;
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}
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//-------------------------------------------------------------------
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// Utility Function for HMAC
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//-------------------------------------------------------------------
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#ifdef USE_GNUTLS_NETTLE
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std::unique_ptr<unsigned char[]> s3fs_HMAC(const void* key, size_t keylen, const unsigned char* data, size_t datalen, unsigned int* digestlen)
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{
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if(!key || !data || !digestlen){
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return nullptr;
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}
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std::unique_ptr<unsigned char[]> digest(new unsigned char[SHA1_DIGEST_SIZE]);
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struct hmac_sha1_ctx ctx_hmac;
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hmac_sha1_set_key(&ctx_hmac, keylen, reinterpret_cast<const uint8_t*>(key));
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hmac_sha1_update(&ctx_hmac, datalen, reinterpret_cast<const uint8_t*>(data));
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hmac_sha1_digest(&ctx_hmac, SHA1_DIGEST_SIZE, reinterpret_cast<uint8_t*>(digest.get()));
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*digestlen = SHA1_DIGEST_SIZE;
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return digest;
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}
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std::unique_ptr<unsigned char[]> s3fs_HMAC256(const void* key, size_t keylen, const unsigned char* data, size_t datalen, unsigned int* digestlen)
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{
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if(!key || !data || !digestlen){
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return nullptr;
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}
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std::unique_ptr<unsigned char[]> digest(new unsigned char[SHA256_DIGEST_SIZE]);
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struct hmac_sha256_ctx ctx_hmac;
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hmac_sha256_set_key(&ctx_hmac, keylen, reinterpret_cast<const uint8_t*>(key));
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hmac_sha256_update(&ctx_hmac, datalen, reinterpret_cast<const uint8_t*>(data));
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hmac_sha256_digest(&ctx_hmac, SHA256_DIGEST_SIZE, reinterpret_cast<uint8_t*>(digest.get()));
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*digestlen = SHA256_DIGEST_SIZE;
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return digest;
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}
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#else // USE_GNUTLS_NETTLE
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std::unique_ptr<unsigned char[]> s3fs_HMAC(const void* key, size_t keylen, const unsigned char* data, size_t datalen, unsigned int* digestlen)
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{
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if(!key || !data || !digestlen){
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return nullptr;
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}
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if(0 == (*digestlen = gnutls_hmac_get_len(GNUTLS_MAC_SHA1))){
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return nullptr;
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}
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std::unique_ptr<unsigned char[]> digest(new unsigned char[*digestlen + 1]);
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if(0 > gnutls_hmac_fast(GNUTLS_MAC_SHA1, key, keylen, data, datalen, digest.get())){
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return nullptr;
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}
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return digest;
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}
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std::unique_ptr<unsigned char[]> s3fs_HMAC256(const void* key, size_t keylen, const unsigned char* data, size_t datalen, unsigned int* digestlen)
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{
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if(!key || !data || !digestlen){
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return nullptr;
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}
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if(0 == (*digestlen = gnutls_hmac_get_len(GNUTLS_MAC_SHA256))){
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return nullptr;
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}
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std::unique_ptr<unsigned char[]> digest(new unsigned char[*digestlen + 1]);
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if(0 > gnutls_hmac_fast(GNUTLS_MAC_SHA256, key, keylen, data, datalen, digest.get())){
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return nullptr;
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}
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return digest;
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}
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#endif // USE_GNUTLS_NETTLE
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//-------------------------------------------------------------------
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// Utility Function for MD5
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//-------------------------------------------------------------------
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#ifdef USE_GNUTLS_NETTLE
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bool s3fs_md5(const unsigned char* data, size_t datalen, md5_t* result)
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{
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struct md5_ctx ctx_md5;
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md5_init(&ctx_md5);
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md5_update(&ctx_md5, datalen, data);
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md5_digest(&ctx_md5, result->size(), result->data());
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return true;
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}
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bool s3fs_md5_fd(int fd, off_t start, off_t size, md5_t* result)
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{
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struct md5_ctx ctx_md5;
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off_t bytes;
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if(-1 == size){
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struct stat st;
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if(-1 == fstat(fd, &st)){
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return false;
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}
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size = st.st_size;
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}
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md5_init(&ctx_md5);
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for(off_t total = 0; total < size; total += bytes){
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off_t len = 512;
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unsigned char buf[len];
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bytes = len < (size - total) ? len : (size - total);
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bytes = pread(fd, buf, bytes, start + total);
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if(0 == bytes){
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// end of file
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break;
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}else if(-1 == bytes){
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// error
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S3FS_PRN_ERR("file read error(%d)", errno);
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return false;
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}
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md5_update(&ctx_md5, bytes, buf);
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}
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md5_digest(&ctx_md5, result->size(), result->data());
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return true;
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}
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#else // USE_GNUTLS_NETTLE
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bool s3fs_md5(const unsigned char* data, size_t datalen, md5_t* digest)
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{
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gcry_md_hd_t ctx_md5;
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gcry_error_t err;
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if(GPG_ERR_NO_ERROR != (err = gcry_md_open(&ctx_md5, GCRY_MD_MD5, 0))){
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S3FS_PRN_ERR("MD5 context creation failure: %s/%s", gcry_strsource(err), gcry_strerror(err));
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return false;
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}
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gcry_md_write(ctx_md5, digest->data(), digest->size());
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gcry_md_close(ctx_md5);
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return true;
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}
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bool s3fs_md5_fd(int fd, off_t start, off_t size, md5_t* result)
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{
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gcry_md_hd_t ctx_md5;
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gcry_error_t err;
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off_t bytes;
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if(-1 == size){
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struct stat st;
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if(-1 == fstat(fd, &st)){
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return false;
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}
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size = st.st_size;
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}
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if(GPG_ERR_NO_ERROR != (err = gcry_md_open(&ctx_md5, GCRY_MD_MD5, 0))){
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S3FS_PRN_ERR("MD5 context creation failure: %s/%s", gcry_strsource(err), gcry_strerror(err));
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return false;
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}
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for(off_t total = 0; total < size; total += bytes){
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off_t len = 512;
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char buf[len];
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bytes = len < (size - total) ? len : (size - total);
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bytes = pread(fd, buf, bytes, start + total);
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if(0 == bytes){
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// end of file
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break;
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}else if(-1 == bytes){
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// error
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S3FS_PRN_ERR("file read error(%d)", errno);
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gcry_md_close(ctx_md5);
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return false;
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}
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gcry_md_write(ctx_md5, buf, bytes);
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}
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memcpy(result->data(), gcry_md_read(ctx_md5, 0), result->size());
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gcry_md_close(ctx_md5);
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return true;
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}
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#endif // USE_GNUTLS_NETTLE
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//-------------------------------------------------------------------
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// Utility Function for SHA256
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//-------------------------------------------------------------------
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#ifdef USE_GNUTLS_NETTLE
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bool s3fs_sha256(const unsigned char* data, size_t datalen, sha256_t* digest)
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{
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struct sha256_ctx ctx_sha256;
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sha256_init(&ctx_sha256);
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sha256_update(&ctx_sha256, datalen, data);
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sha256_digest(&ctx_sha256, digest->size(), digest->data());
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return true;
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}
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bool s3fs_sha256_fd(int fd, off_t start, off_t size, sha256_t* result)
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{
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struct sha256_ctx ctx_sha256;
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off_t bytes;
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sha256_init(&ctx_sha256);
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for(off_t total = 0; total < size; total += bytes){
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off_t len = 512;
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unsigned char buf[len];
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bytes = len < (size - total) ? len : (size - total);
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bytes = pread(fd, buf, bytes, start + total);
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if(0 == bytes){
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// end of file
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break;
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}else if(-1 == bytes){
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// error
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S3FS_PRN_ERR("file read error(%d)", errno);
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return false;
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}
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sha256_update(&ctx_sha256, bytes, buf);
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}
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sha256_digest(&ctx_sha256, result->size(), result->data());
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return true;
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}
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#else // USE_GNUTLS_NETTLE
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bool s3fs_sha256(const unsigned char* data, size_t datalen, sha256_t* digest)
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{
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gcry_md_hd_t ctx_sha256;
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gcry_error_t err;
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if(GPG_ERR_NO_ERROR != (err = gcry_md_open(&ctx_sha256, GCRY_MD_SHA256, 0))){
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S3FS_PRN_ERR("SHA256 context creation failure: %s/%s", gcry_strsource(err), gcry_strerror(err));
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return false;
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}
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gcry_md_write(ctx_sha256, data, datalen);
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memcpy(digest->data(), gcry_md_read(ctx_sha256, 0), digest->size());
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gcry_md_close(ctx_sha256);
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return true;
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}
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bool s3fs_sha256_fd(int fd, off_t start, off_t size, sha256_t* result)
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{
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gcry_md_hd_t ctx_sha256;
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gcry_error_t err;
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off_t bytes;
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if(-1 == size){
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struct stat st;
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if(-1 == fstat(fd, &st)){
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return false;
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}
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size = st.st_size;
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}
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if(GPG_ERR_NO_ERROR != (err = gcry_md_open(&ctx_sha256, GCRY_MD_SHA256, 0))){
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S3FS_PRN_ERR("SHA256 context creation failure: %s/%s", gcry_strsource(err), gcry_strerror(err));
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return false;
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}
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for(off_t total = 0; total < size; total += bytes){
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off_t len = 512;
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char buf[len];
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bytes = len < (size - total) ? len : (size - total);
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bytes = pread(fd, buf, bytes, start + total);
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if(0 == bytes){
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// end of file
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break;
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}else if(-1 == bytes){
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// error
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S3FS_PRN_ERR("file read error(%d)", errno);
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gcry_md_close(ctx_sha256);
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return false;
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}
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gcry_md_write(ctx_sha256, buf, bytes);
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}
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memcpy(result->data(), gcry_md_read(ctx_sha256, 0), result->size());
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gcry_md_close(ctx_sha256);
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return true;
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}
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#endif // USE_GNUTLS_NETTLE
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: expandtab sw=4 ts=4 fdm=marker
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* vim<600: expandtab sw=4 ts=4
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*/
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