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/*
* Copyright (C) 2010 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kAccessControl
#include "mongo/platform/basic.h"
#include "mongo/db/auth/security_key.h"
#include <sys/stat.h>
#include <string>
#include <vector>
#include "mongo/bson/mutable/document.h"
#include "mongo/bson/mutable/element.h"
#include "mongo/client/sasl_client_authenticate.h"
#include "mongo/crypto/mechanism_scram.h"
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/auth/user.h"
#include "mongo/db/server_options.h"
#include "mongo/util/log.h"
#include "mongo/util/password_digest.h"
namespace mongo {
namespace mmb = mongo::mutablebson;
// not guarded by the authParams mutex never changed in
// multi-threaded operation
static bool authParamsSet = false;
// Store default authentication parameters for internal authentication to cluster members,
// guarded by the authParams mutex
static BSONObj authParams;
// Store MONGODB-CR authentication parameters to use as fallback for mixed 2.6/28 clusters
static BSONObj authParamsCR;
static boost::mutex authParamMutex;
bool isInternalAuthSet() {
return authParamsSet;
}
void setInternalUserAuthParams(const BSONObj& authParamsIn) {
if (!isInternalAuthSet()) {
authParamsSet = true;
}
boost::mutex::scoped_lock lk(authParamMutex);
authParams = authParamsIn.copy();
// Create authParams for legacy MONGODB-CR authentication if applicable.
if (authParams["mechanism"].String() == "SCRAM-SHA-1") {
mmb::Document doc(authParams);
doc.root().findFirstChildNamed("mechanism").setValueString("MONGODB-CR");
authParamsCR = doc.getObject().copy();
}
}
bool authenticateInternalUser(DBClientWithCommands* conn){
if (!isInternalAuthSet()) {
log() << "ERROR: No authentication parameters set for internal user" << endl;
return false;
}
BSONObj authParamsCopy;
BSONObj authParamsCRCopy;
{
boost::mutex::scoped_lock lk(authParamMutex);
authParamsCopy = authParams.copy();
authParamsCRCopy = authParamsCR.copy();
}
try {
conn->auth(authParamsCopy);
return true;
} catch(const UserException& ex) {
if (ex.getCode() != ErrorCodes::BadValue &&
ex.getCode() != ErrorCodes::CommandNotFound) {
log() << "can't authenticate to " << conn->toString() <<
" as internal user, error: "<< ex.what() << endl;
return false;
}
}
// BadValue indicates unsupported auth mechanism so fall back to
// MONGODB-CR for 2.6 compatibility.
try {
conn->auth(authParamsCRCopy);
return true;
} catch(const UserException& ex) {
log() << "can't authenticate to " << conn->toString() << " as internal user, error: "
<< ex.what() << endl;
return false;
}
}
bool setUpSecurityKey(const string& filename) {
struct stat stats;
// check obvious file errors
if (stat(filename.c_str(), &stats) == -1) {
log() << "error getting file " << filename << ": " << strerror(errno) << endl;
return false;
}
#if !defined(_WIN32)
// check permissions: must be X00, where X is >= 4
if ((stats.st_mode & (S_IRWXG|S_IRWXO)) != 0) {
log() << "permissions on " << filename << " are too open" << endl;
return false;
}
#endif
FILE* file = fopen( filename.c_str(), "rb" );
if (!file) {
log() << "error opening file: " << filename << ": " << strerror(errno) << endl;
return false;
}
string str = "";
// strip key file
const unsigned long long fileLength = stats.st_size;
unsigned long long read = 0;
while (read < fileLength) {
char buf;
int readLength = fread(&buf, 1, 1, file);
if (readLength < 1) {
log() << "error reading file " << filename << endl;
fclose( file );
return false;
}
read++;
// check for whitespace
if ((buf >= '\x09' && buf <= '\x0D') || buf == ' ') {
continue;
}
// check valid base64
if ((buf < 'A' || buf > 'Z') && (buf < 'a' || buf > 'z') && (buf < '0' || buf > '9') && buf != '+' && buf != '/') {
log() << "invalid char in key file " << filename << ": " << buf << endl;
fclose( file );
return false;
}
str += buf;
}
fclose( file );
const unsigned long long keyLength = str.size();
if (keyLength < 6 || keyLength > 1024) {
log() << " security key in " << filename << " has length " << keyLength
<< ", must be between 6 and 1024 chars" << endl;
return false;
}
// Generate MONGODB-CR and SCRAM credentials for the internal user based on the keyfile.
User::CredentialData credentials;
credentials.password = mongo::createPasswordDigest(
internalSecurity.user->getName().getUser().toString(), str);
BSONObj creds = scram::generateCredentials(credentials.password);
credentials.scram.iterationCount = creds[scram::iterationCountFieldName].Int();
credentials.scram.salt = creds[scram::saltFieldName].String();
credentials.scram.storedKey = creds[scram::storedKeyFieldName].String();
credentials.scram.serverKey = creds[scram::serverKeyFieldName].String();
internalSecurity.user->setCredentials(credentials);
int clusterAuthMode = serverGlobalParams.clusterAuthMode.load();
if (clusterAuthMode == ServerGlobalParams::ClusterAuthMode_keyFile ||
clusterAuthMode == ServerGlobalParams::ClusterAuthMode_sendKeyFile) {
setInternalUserAuthParams(
BSON(saslCommandMechanismFieldName << "SCRAM-SHA-1" <<
saslCommandUserDBFieldName <<
internalSecurity.user->getName().getDB() <<
saslCommandUserFieldName << internalSecurity.user->getName().getUser() <<
saslCommandPasswordFieldName << credentials.password <<
saslCommandDigestPasswordFieldName << false));
}
return true;
}
} // namespace mongo
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