// Read a v5 archive, which is a proprietary binary format.
bool readV5Config( const char *configFile,
EncfsConfig &config, ConfigInfo *)
{
bool ok = false;
// use Config to parse the file and query it..
ConfigReader cfgRdr;
if(cfgRdr.load( configFile ))
{
try
{
config.set_revision(cfgRdr["subVersion"].readInt(0));
if(config.revision() > V5Latest)
{
/* config file specifies a version outside our supported
range.. */
LOG(ERROR) << "Config subversion " << config.revision()
<< " found, but this version of encfs only supports up to version "
<< V5Latest;
return false;
}
if( config.revision() < V5Latest )
{
LOG(ERROR) << "This version of EncFS doesn't support "
<< "filesystems created with EncFS releases before 2004-08-13";
return false;
}
cfgRdr["creator"] >> (*config.mutable_creator());
cfgRdr["cipher"] >> (*config.mutable_cipher());
cfgRdr["naming"] >> (*config.mutable_naming());
int blockSize;
cfgRdr["blockSize"] >> blockSize;
config.set_block_size(blockSize);
EncryptedKey *encryptedKey = config.mutable_key();
int keySize;
cfgRdr["keySize"] >> keySize;
encryptedKey->set_size(keySize / 8);
cfgRdr["keyData"] >> (*encryptedKey->mutable_ciphertext());
config.set_unique_iv( cfgRdr["uniqueIV"].readBool( false ) );
config.set_chained_iv( cfgRdr["chainedIV"].readBool( false ) );
config.set_external_iv( cfgRdr["externalIV"].readBool( false ) );
config.set_block_mac_bytes( cfgRdr["blockMACBytes"].readInt(0) );
config.set_block_mac_rand_bytes( cfgRdr["blockMACRandBytes"].readInt(0) );
ok = true;
} catch( Error &err)
{
LOG(WARNING) << "Error parsing data in config file " << configFile
<< "; " << err.what();
ok = false;
}
}
return ok;
}
/* Passing a copy to rootDir is on purpose here */
static int isValidEncFS(std::string rootDir) {
if( !checkDir( rootDir ))
return EXIT_FAILURE;
#ifdef ENCFS_SVN
EncfsConfig config;
#else
shared_ptr<EncFSConfig> config(new EncFSConfig);
#endif
ConfigType type = readConfig( rootDir, config );
#ifdef ENCFS_SVN
std::string config_creator = config.creator();
int config_revision = config.revision();
#else
std::string config_creator = config->creator;
int config_revision = config->subVersion;
#endif
std::ostringstream info;
// show information stored in config..
switch(type)
{
case Config_None:
info << "Unable to load or parse config file in " << rootDir;
LOGI(info.str().c_str());
return EXIT_FAILURE;
case Config_Prehistoric:
LOGI("A really old EncFS filesystem was found.\n"
"It is not supported in this EncFS build.");
return EXIT_FAILURE;
case Config_V3:
info << "Version 3 configuration; created by " << config_creator.c_str();
break;
case Config_V4:
info << "Version 4 configuration; created by " << config_creator.c_str();
break;
case Config_V5:
info << "Version 5 configuration; created by " << config_creator.c_str()
<< " (revision " << config_revision << ")";
break;
case Config_V6:
info << "Version 6 configuration; created by " << config_creator.c_str()
<< " (revision " << config_revision << ")";
break;
#ifdef ENCFS_SVN
case Config_V7:
info << "Version 7 configuration; created by " << config_creator.c_str()
<< " (revision " << config_revision << ")";
break;
#endif
}
LOGI(info.str().c_str());
showFSInfo( config );
return EXIT_SUCCESS;
}
static int showInfo( int argc, char **argv )
{
(void)argc;
string rootDir = argv[1];
if( !checkDir( rootDir ))
return EXIT_FAILURE;
EncfsConfig config;
ConfigType type = readConfig( rootDir, config );
// show information stored in config..
switch(type)
{
case Config_None:
// xgroup(diag)
cout << _("Unable to load or parse config file\n");
return EXIT_FAILURE;
case Config_Prehistoric:
// xgroup(diag)
cout << _("A really old EncFS filesystem was found. \n"
"It is not supported in this EncFS build.\n");
return EXIT_FAILURE;
case Config_V3:
// xgroup(diag)
cout << "\n" << autosprintf(_("Version 3 configuration; "
"created by %s\n"), config.creator().c_str());
break;
case Config_V4:
// xgroup(diag)
cout << "\n" << autosprintf(_("Version 4 configuration; "
"created by %s\n"), config.creator().c_str());
break;
case Config_V5:
case Config_V6:
case Config_V7:
// xgroup(diag)
cout << "\n" << autosprintf(_("Version %i configuration; "
"created by %s (revision %i)\n"),
type,
config.creator().c_str(),
config.revision());
break;
}
showFSInfo( config );
return EXIT_SUCCESS;
}
// Read a boost::serialization config file using an Xml reader..
bool readV6Config( const char *configFile,
EncfsConfig &cfg, ConfigInfo *info)
{
(void)info;
XmlReader rdr;
if (!rdr.load(configFile))
{
LOG(ERROR) << "Failed to load config file " << configFile;
return false;
}
XmlValuePtr serialization = rdr["boost_serialization"];
XmlValuePtr config = (*serialization)["cfg"];
if (!config) {
config = (*serialization)["config"];
}
if (!config) {
LOG(ERROR) << "Unable to find XML configuration in file " << configFile;
return false;
}
int version;
if (!config->read("version", &version) &&
!config->read("@version", &version)) {
LOG(ERROR) << "Unable to find version in config file";
return false;
}
// version numbering was complicated by boost::archive
if (version == 20 || version >= 20100713)
{
VLOG(1) << "found new serialization format";
cfg.set_revision(version);
} else if (version == 26800)
{
VLOG(1) << "found 20080816 version";
cfg.set_revision(20080816);
} else if (version == 26797)
{
VLOG(1) << "found 20080813";
cfg.set_revision(20080813);
} else if (version < V5Latest)
{
LOG(ERROR) << "Invalid version " << version
<< " - please fix config file";
} else
{
LOG(INFO) << "Boost <= 1.41 compatibility mode";
cfg.set_revision(version);
}
VLOG(1) << "subVersion = " << cfg.revision();
config->read("creator", cfg.mutable_creator());
config->read("cipherAlg", cfg.mutable_cipher());
config->read("nameAlg", cfg.mutable_naming());
//(*config)["keySize"] >> cfg.keySize;
int blockSize, blockMacBytes, blockMacRandBytes;
bool uniqueIv, chainedNameIv, externalIv, allowHoles;
config->read("blockSize", &blockSize);
config->read("uniqueIV", &uniqueIv);
config->read("chainedNameIV", &chainedNameIv);
config->read("externalIVChaining", &externalIv);
config->read("blockMACBytes", &blockMacBytes);
config->read("blockMACRandBytes", &blockMacRandBytes);
config->read("allowHoles", &allowHoles);
cfg.set_block_size(blockSize);
cfg.set_unique_iv(uniqueIv);
cfg.set_chained_iv(chainedNameIv);
cfg.set_external_iv(externalIv);
cfg.set_block_mac_bytes(blockMacBytes);
cfg.set_block_mac_rand_bytes(blockMacRandBytes);
cfg.set_allow_holes(allowHoles);
EncryptedKey *encryptedKey = cfg.mutable_key();
int encodedSize;
config->read("encodedKeySize", &encodedSize);
unsigned char *key = new unsigned char[encodedSize];
config->readB64("encodedKeyData", key, encodedSize);
encryptedKey->set_ciphertext(key, encodedSize);
delete[] key;
int keySize;
config->read("keySize", &keySize);
encryptedKey->set_size(keySize / 8); // save as size in bytes
if(cfg.revision() >= 20080816)
{
int saltLen;
config->read("saltLen", &saltLen);
unsigned char *salt = new unsigned char[saltLen];
config->readB64("saltData", salt, saltLen);
encryptedKey->set_salt(salt, saltLen);
delete[] salt;
int kdfIterations, desiredKDFDuration;
config->read("kdfIterations", &kdfIterations);
config->read("desiredKDFDuration", &desiredKDFDuration);
encryptedKey->set_kdf_iterations(kdfIterations);
encryptedKey->set_kdf_duration(desiredKDFDuration);
} else
{
encryptedKey->clear_salt();
encryptedKey->set_kdf_iterations(16);
encryptedKey->clear_kdf_duration();
}
return true;
}
void showFSInfo( const EncfsConfig &config )
{
shared_ptr<CipherV1> cipher = CipherV1::New( config.cipher(),
config.key().size() );
{
cout << autosprintf(
// xgroup(diag)
_("Filesystem cipher: \"%s\", version %i:%i:%i"),
config.cipher().name().c_str(), config.cipher().major(),
config.cipher().minor(), config.cipher().age());
// check if we support this interface..
if(!cipher)
cout << _(" (NOT supported)\n");
else
{
// if we're using a newer interface, show the version number
if( config.cipher() != cipher->interface() )
{
Interface iface = cipher->interface();
// xgroup(diag)
cout << autosprintf(_(" (using %i:%i:%i)\n"),
iface.major(), iface.minor(), iface.age());
} else
cout << "\n";
}
}
// xgroup(diag)
cout << autosprintf(_("Filename encoding: \"%s\", version %i:%i:%i"),
config.naming().name().c_str(), config.naming().major(),
config.naming().minor(), config.naming().age());
if (!cipher)
{
cout << "\n";
} else
{
// check if we support the filename encoding interface..
shared_ptr<NameIO> nameCoder = NameIO::New( config.naming(), cipher );
if(!nameCoder)
{
// xgroup(diag)
cout << _(" (NOT supported)\n");
} else
{
// if we're using a newer interface, show the version number
if( config.naming() != nameCoder->interface() )
{
Interface iface = nameCoder->interface();
cout << autosprintf(_(" (using %i:%i:%i)\n"),
iface.major(), iface.minor(), iface.age());
} else
cout << "\n";
}
}
const EncryptedKey &key = config.key();
{
cout << autosprintf(_("Key Size: %i bits"), 8 * key.size());
cipher = getCipher(config);
if(!cipher)
{
// xgroup(diag)
cout << _(" (NOT supported)\n");
} else
cout << "\n";
}
if(key.kdf_iterations() > 0 && key.salt().size() > 0)
{
cout << autosprintf(_("Using PBKDF2, with %i iterations"),
key.kdf_iterations()) << "\n";
cout << autosprintf(_("Salt Size: %i bits"),
8*(int)key.salt().size()) << "\n";
}
if(config.block_mac_bytes() || config.block_mac_rand_bytes())
{
if(config.revision() < V5Latest)
{
cout << autosprintf(
// xgroup(diag)
_("Block Size: %i bytes + %i byte MAC header"),
config.block_size(),
config.block_mac_bytes() + config.block_mac_rand_bytes()) << endl;
} else
{
// new version stores the header as part of that block size..
cout << autosprintf(
// xgroup(diag)
_("Block Size: %i bytes, including %i byte MAC header"),
config.block_size(),
config.block_mac_bytes() + config.block_mac_rand_bytes()) << endl;
}
} else
{
// xgroup(diag)
cout << autosprintf(_("Block Size: %i bytes"), config.block_size());
cout << "\n";
}
if(config.unique_iv())
{
// xgroup(diag)
cout << _("Each file contains 8 byte header with unique IV data.\n");
}
if(config.chained_iv())
{
// xgroup(diag)
cout << _("Filenames encoded using IV chaining mode.\n");
}
if(config.external_iv())
{
// xgroup(diag)
cout << _("File data IV is chained to filename IV.\n");
}
if(config.allow_holes())
{
// xgroup(diag)
cout << _("File holes passed through to ciphertext.\n");
}
cout << "\n";
}