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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/commands/authentication_commands.h"
#include <string>
#include <vector>
#include "mongo/base/status.h"
#include "mongo/bson/mutable/algorithm.h"
#include "mongo/bson/mutable/document.h"
#include "mongo/client/sasl_client_authenticate.h"
#include "mongo/config.h"
#include "mongo/db/audit.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/authorization_manager_global.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/mongo_authentication_session.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/auth/sasl_options.h"
#include "mongo/db/auth/security_key.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/server_options.h"
#include "mongo/platform/random.h"
#include "mongo/stdx/memory.h"
#include "mongo/transport/session.h"
#include "mongo/util/concurrency/mutex.h"
#include "mongo/util/log.h"
#include "mongo/util/md5.hpp"
#include "mongo/util/net/ssl_manager.h"
#include "mongo/util/text.h"
namespace mongo {
using std::hex;
using std::string;
using std::stringstream;
static bool _isCRAuthDisabled;
static bool _isX509AuthDisabled;
static const char _nonceAuthenticationDisabledMessage[] =
"Challenge-response authentication using getnonce and authenticate commands is disabled.";
static const char _x509AuthenticationDisabledMessage[] = "x.509 authentication is disabled.";
void CmdAuthenticate::disableAuthMechanism(std::string authMechanism) {
if (authMechanism == "MONGODB-CR") {
_isCRAuthDisabled = true;
}
if (authMechanism == "MONGODB-X509") {
_isX509AuthDisabled = true;
}
}
/* authentication
system.users contains
{ user : <username>, pwd : <pwd_digest>, ... }
getnonce sends nonce to client
client then sends { authenticate:1, nonce64:<nonce_str>, user:<username>, key:<key> }
where <key> is md5(<nonce_str><username><pwd_digest_str>) as a string
*/
class CmdGetNonce : public Command {
public:
CmdGetNonce() : Command("getnonce"), _random(SecureRandom::create()) {}
virtual bool slaveOk() const {
return true;
}
void help(stringstream& h) const {
h << "internal";
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {} // No auth required
bool run(OperationContext* opCtx,
const string&,
const BSONObj& cmdObj,
string& errmsg,
BSONObjBuilder& result) {
nonce64 n = getNextNonce();
stringstream ss;
ss << hex << n;
result.append("nonce", ss.str());
AuthenticationSession::set(Client::getCurrent(),
stdx::make_unique<MongoAuthenticationSession>(n));
return true;
}
private:
nonce64 getNextNonce() {
stdx::lock_guard<SimpleMutex> lk(_randMutex);
return _random->nextInt64();
}
SimpleMutex _randMutex; // Synchronizes accesses to _random.
std::unique_ptr<SecureRandom> _random;
} cmdGetNonce;
void CmdAuthenticate::redactForLogging(mutablebson::Document* cmdObj) {
namespace mmb = mutablebson;
static const int numRedactedFields = 2;
static const char* redactedFields[numRedactedFields] = {"key", "nonce"};
for (int i = 0; i < numRedactedFields; ++i) {
for (mmb::Element element = mmb::findFirstChildNamed(cmdObj->root(), redactedFields[i]);
element.ok();
element = mmb::findElementNamed(element.rightSibling(), redactedFields[i])) {
element.setValueString("xxx");
}
}
}
bool CmdAuthenticate::run(OperationContext* opCtx,
const string& dbname,
const BSONObj& cmdObj,
string& errmsg,
BSONObjBuilder& result) {
if (!serverGlobalParams.quiet.load()) {
mutablebson::Document cmdToLog(cmdObj, mutablebson::Document::kInPlaceDisabled);
redactForLogging(&cmdToLog);
log() << " authenticate db: " << dbname << " " << cmdToLog;
}
std::string mechanism = cmdObj.getStringField("mechanism");
if (mechanism.empty()) {
mechanism = "MONGODB-CR";
}
UserName user;
auto& sslPeerInfo = SSLPeerInfo::forSession(opCtx->getClient()->session());
if (mechanism == "MONGODB-X509" && !cmdObj.hasField("user")) {
user = UserName(sslPeerInfo.subjectName, dbname);
} else {
user = UserName(cmdObj.getStringField("user"), dbname);
}
if (Command::testCommandsEnabled && user.getDB() == "admin" &&
user.getUser() == internalSecurity.user->getName().getUser()) {
// Allows authenticating as the internal user against the admin database. This is to
// support the auth passthrough test framework on mongos (since you can't use the local
// database on a mongos, so you can't auth as the internal user without this).
user = internalSecurity.user->getName();
}
Status status = _authenticate(opCtx, mechanism, user, cmdObj);
audit::logAuthentication(Client::getCurrent(), mechanism, user, status.code());
if (!status.isOK()) {
if (!serverGlobalParams.quiet.load()) {
auto const client = opCtx->getClient();
log() << "Failed to authenticate " << user
<< (client->hasRemote() ? (" from client " + client->getRemote().toString()) : "")
<< " with mechanism " << mechanism << ": " << status;
}
if (status.code() == ErrorCodes::AuthenticationFailed) {
// Statuses with code AuthenticationFailed may contain messages we do not wish to
// reveal to the user, so we return a status with the message "auth failed".
appendCommandStatus(result, Status(ErrorCodes::AuthenticationFailed, "auth failed"));
} else {
appendCommandStatus(result, status);
}
sleepmillis(saslGlobalParams.authFailedDelay.load());
return false;
}
result.append("dbname", user.getDB());
result.append("user", user.getUser());
return true;
}
Status CmdAuthenticate::_authenticate(OperationContext* opCtx,
const std::string& mechanism,
const UserName& user,
const BSONObj& cmdObj) {
if (mechanism == "MONGODB-CR") {
return _authenticateCR(opCtx, user, cmdObj);
}
#ifdef MONGO_CONFIG_SSL
if (mechanism == "MONGODB-X509") {
return _authenticateX509(opCtx, user, cmdObj);
}
#endif
return Status(ErrorCodes::BadValue, "Unsupported mechanism: " + mechanism);
}
Status CmdAuthenticate::_authenticateCR(OperationContext* opCtx,
const UserName& user,
const BSONObj& cmdObj) {
if (user == internalSecurity.user->getName() &&
serverGlobalParams.clusterAuthMode.load() == ServerGlobalParams::ClusterAuthMode_x509) {
return Status(ErrorCodes::AuthenticationFailed,
"Mechanism x509 is required for internal cluster authentication");
}
if (_isCRAuthDisabled) {
// SERVER-8461, MONGODB-CR must be enabled for authenticating the internal user, so that
// cluster members may communicate with each other.
if (user != internalSecurity.user->getName()) {
return Status(ErrorCodes::BadValue, _nonceAuthenticationDisabledMessage);
}
}
string key = cmdObj.getStringField("key");
string received_nonce = cmdObj.getStringField("nonce");
if (user.getUser().empty() || key.empty() || received_nonce.empty()) {
sleepmillis(10);
return Status(ErrorCodes::ProtocolError,
"field missing/wrong type in received authenticate command");
}
stringstream digestBuilder;
{
Client* client = Client::getCurrent();
std::unique_ptr<AuthenticationSession> session;
AuthenticationSession::swap(client, session);
if (!session || session->getType() != AuthenticationSession::SESSION_TYPE_MONGO) {
sleepmillis(30);
return Status(ErrorCodes::ProtocolError, "No pending nonce");
} else {
nonce64 nonce = static_cast<MongoAuthenticationSession*>(session.get())->getNonce();
digestBuilder << hex << nonce;
if (digestBuilder.str() != received_nonce) {
sleepmillis(30);
return Status(ErrorCodes::AuthenticationFailed, "Received wrong nonce.");
}
}
}
User* userObj;
Status status =
getGlobalAuthorizationManager()->acquireUserForInitialAuth(opCtx, user, &userObj);
if (!status.isOK()) {
// Failure to find the privilege document indicates no-such-user, a fact that we do not
// wish to reveal to the client. So, we return AuthenticationFailed rather than passing
// through the returned status.
return Status(ErrorCodes::AuthenticationFailed, status.toString());
}
string pwd = userObj->getCredentials().password;
getGlobalAuthorizationManager()->releaseUser(userObj);
if (pwd.empty()) {
return Status(ErrorCodes::AuthenticationFailed,
"MONGODB-CR credentials missing in the user document");
}
md5digest d;
{
digestBuilder << user.getUser() << pwd;
string done = digestBuilder.str();
md5_state_t st;
md5_init(&st);
md5_append(&st, (const md5_byte_t*)done.c_str(), done.size());
md5_finish(&st, d);
}
string computed = digestToString(d);
if (key != computed) {
return Status(ErrorCodes::AuthenticationFailed, "key mismatch");
}
AuthorizationSession* authorizationSession = AuthorizationSession::get(Client::getCurrent());
status = authorizationSession->addAndAuthorizeUser(opCtx, user);
if (!status.isOK()) {
return status;
}
return Status::OK();
}
#ifdef MONGO_CONFIG_SSL
Status CmdAuthenticate::_authenticateX509(OperationContext* opCtx,
const UserName& user,
const BSONObj& cmdObj) {
if (!getSSLManager()) {
return Status(ErrorCodes::ProtocolError,
"SSL support is required for the MONGODB-X509 mechanism.");
}
if (user.getDB() != "$external") {
return Status(ErrorCodes::ProtocolError,
"X.509 authentication must always use the $external database.");
}
Client* client = Client::getCurrent();
AuthorizationSession* authorizationSession = AuthorizationSession::get(client);
auto clientName = SSLPeerInfo::forSession(client->session()).subjectName;
if (!getSSLManager()->getSSLConfiguration().hasCA) {
return Status(ErrorCodes::AuthenticationFailed,
"Unable to verify x.509 certificate, as no CA has been provided.");
} else if (user.getUser() != clientName) {
return Status(ErrorCodes::AuthenticationFailed,
"There is no x.509 client certificate matching the user.");
} else {
// Handle internal cluster member auth, only applies to server-server connections
if (getSSLManager()->getSSLConfiguration().isClusterMember(clientName)) {
int clusterAuthMode = serverGlobalParams.clusterAuthMode.load();
if (clusterAuthMode == ServerGlobalParams::ClusterAuthMode_undefined ||
clusterAuthMode == ServerGlobalParams::ClusterAuthMode_keyFile) {
return Status(ErrorCodes::AuthenticationFailed,
"The provided certificate "
"can only be used for cluster authentication, not client "
"authentication. The current configuration does not allow "
"x.509 cluster authentication, check the --clusterAuthMode flag");
}
authorizationSession->grantInternalAuthorization();
}
// Handle normal client authentication, only applies to client-server connections
else {
if (_isX509AuthDisabled) {
return Status(ErrorCodes::BadValue, _x509AuthenticationDisabledMessage);
}
Status status = authorizationSession->addAndAuthorizeUser(opCtx, user);
if (!status.isOK()) {
return status;
}
}
return Status::OK();
}
}
#endif
CmdAuthenticate cmdAuthenticate;
class CmdLogout : public Command {
public:
virtual bool slaveOk() const {
return true;
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {} // No auth required
void help(stringstream& h) const {
h << "de-authenticate";
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
CmdLogout() : Command("logout") {}
bool run(OperationContext* opCtx,
const string& dbname,
const BSONObj& cmdObj,
string& errmsg,
BSONObjBuilder& result) {
AuthorizationSession* authSession = AuthorizationSession::get(Client::getCurrent());
authSession->logoutDatabase(dbname);
if (Command::testCommandsEnabled && dbname == "admin") {
// Allows logging out as the internal user against the admin database, however
// this actually logs out of the local database as well. This is to
// support the auth passthrough test framework on mongos (since you can't use the
// local database on a mongos, so you can't logout as the internal user
// without this).
authSession->logoutDatabase("local");
}
return true;
}
} cmdLogout;
}
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