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/**
* Copyright (C) 2008 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/base/status.h"
#include "mongo/client/sasl_client_authenticate.h"
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/resource_pattern.h"
#include "mongo/db/catalog/document_validation.h"
#include "mongo/db/cloner.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/copydb.h"
#include "mongo/db/commands/copydb_start_commands.h"
#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/namespace_string.h"
namespace {
using namespace mongo;
using std::string;
using std::stringstream;
/* Usage:
* admindb.$cmd.findOne( { copydb: 1, fromhost: <connection string>, fromdb: <db>,
* todb: <db>[, username: <username>, nonce: <nonce>, key: <key>] } );
*
* The "copydb" command is used to copy a database. Note that this is a very broad definition.
* This means that the "copydb" command can be used in the following ways:
*
* 1. To copy a database within a single node
* 2. To copy a database within a sharded cluster, possibly to another shard
* 3. To copy a database from one cluster to another
*
* Note that in all cases both the target and source database must be unsharded.
*
* The "copydb" command gets sent by the client or the mongos to the destination of the copy
* operation. The node, cluster, or shard that recieves the "copydb" command must then query
* the source of the database to be copied for all the contents and metadata of the database.
*
*
*
* When used with auth, there are two different considerations.
*
* The first is authentication with the target. The only entity that needs to authenticate with
* the target node is the client, so authentication works there the same as it would with any
* other command.
*
* The second is the authentication of the target with the source, which is needed because the
* target must query the source directly for the contents of the database. To do this, the
* client must use the "copydbgetnonce" command, in which the target will get a nonce from the
* source and send it back to the client. The client can then hash its password with the nonce,
* send it to the target when it runs the "copydb" command, which can then use that information
* to authenticate with the source.
*
* NOTE: mongos doesn't know how to call or handle the "copydbgetnonce" command. See
* SERVER-6427.
*
* NOTE: Since internal cluster auth works differently, "copydb" currently doesn't work between
* shards in a cluster when auth is enabled. See SERVER-13080.
*/
class CmdCopyDb : public ErrmsgCommandDeprecated {
public:
CmdCopyDb() : ErrmsgCommandDeprecated("copydb") {}
virtual bool adminOnly() const {
return true;
}
AllowedOnSecondary secondaryAllowed() const override {
return AllowedOnSecondary::kNever;
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return true;
}
virtual Status checkAuthForCommand(Client* client,
const std::string& dbname,
const BSONObj& cmdObj) {
return copydb::checkAuthForCopydbCommand(client, dbname, cmdObj);
}
std::string help() const override {
return "copy a database from another host to this host\n"
"usage: {copydb: 1, fromhost: <connection string>, fromdb: <db>, todb: <db>"
"[, slaveOk: <bool>, username: <username>, nonce: <nonce>, key: <key>]}";
}
virtual bool errmsgRun(OperationContext* opCtx,
const string& dbname,
const BSONObj& cmdObj,
string& errmsg,
BSONObjBuilder& result) {
boost::optional<DisableDocumentValidation> maybeDisableValidation;
if (shouldBypassDocumentValidationForCommand(cmdObj))
maybeDisableValidation.emplace(opCtx);
string fromhost = cmdObj.getStringField("fromhost");
bool fromSelf = fromhost.empty();
if (fromSelf) {
/* copy from self */
stringstream ss;
ss << "localhost:" << serverGlobalParams.port;
fromhost = ss.str();
}
CloneOptions cloneOptions;
const auto fromdbElt = cmdObj["fromdb"];
uassert(ErrorCodes::TypeMismatch,
"'fromdb' must be of type String",
fromdbElt.type() == BSONType::String);
cloneOptions.fromDB = fromdbElt.str();
cloneOptions.slaveOk = cmdObj["slaveOk"].trueValue();
cloneOptions.useReplAuth = false;
cloneOptions.snapshot = true;
const auto todbElt = cmdObj["todb"];
uassert(ErrorCodes::TypeMismatch,
"'todb' must be of type String",
todbElt.type() == BSONType::String);
const std::string todb = todbElt.str();
uassert(ErrorCodes::InvalidNamespace,
str::stream() << "Invalid 'todb' name: " << todb,
NamespaceString::validDBName(todb, NamespaceString::DollarInDbNameBehavior::Allow));
uassert(ErrorCodes::InvalidNamespace,
str::stream() << "Invalid 'fromdb' name: " << cloneOptions.fromDB,
NamespaceString::validDBName(cloneOptions.fromDB,
NamespaceString::DollarInDbNameBehavior::Allow));
if (fromhost.empty()) {
errmsg =
"params missing - {copydb: 1, fromhost: <connection string>, "
"fromdb: <db>, todb: <db>}";
return false;
}
Cloner cloner;
auto& authConn = CopyDbAuthConnection::forClient(opCtx->getClient());
if (cmdObj.hasField(saslCommandConversationIdFieldName) &&
cmdObj.hasField(saslCommandPayloadFieldName)) {
uassert(25487, "must call copydbsaslstart first", authConn.get());
BSONObj ret;
if (!authConn->runCommand(
cloneOptions.fromDB,
BSON("saslContinue" << 1 << cmdObj[saslCommandConversationIdFieldName]
<< cmdObj[saslCommandPayloadFieldName]),
ret)) {
errmsg = "unable to login " + ret.toString();
authConn.reset();
return false;
}
if (!ret["done"].Bool()) {
CommandHelpers::filterCommandReplyForPassthrough(ret, &result);
return true;
}
result.append("done", true);
cloner.setConnection(std::move(authConn));
} else if (!fromSelf) {
// If fromSelf leave the cloner's conn empty, it will use a DBDirectClient instead.
const ConnectionString cs(uassertStatusOK(ConnectionString::parse(fromhost)));
auto conn = cs.connect(StringData(), errmsg);
if (!conn) {
return false;
}
cloner.setConnection(std::move(conn));
}
// Either we didn't need the authConn (if we even had one), or we already moved it
// into the cloner so just make sure we don't keep it around if we don't need it.
authConn.reset();
if (fromSelf) {
// SERVER-4328 todo lock just the two db's not everything for the fromself case
Lock::GlobalWrite lk(opCtx);
uassertStatusOK(cloner.copyDb(opCtx, todb, fromhost, cloneOptions, NULL));
} else {
Lock::DBLock lk(opCtx, todb, MODE_X);
uassertStatusOK(cloner.copyDb(opCtx, todb, fromhost, cloneOptions, NULL));
}
return true;
}
} cmdCopyDB;
} // namespace
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