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security_commands.cpp
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security_commands.cpp
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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/>.
*/
#include "mongo/pch.h"
#include <string>
#include <vector>
#include "mongo/base/status.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/authentication_session.h"
#include "mongo/db/auth/mongo_authentication_session.h"
#include "mongo/db/auth/principal.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/auth/privilege_set.h"
#include "mongo/db/client_basic.h"
#include "mongo/db/commands.h"
#include "mongo/db/db.h"
#include "mongo/db/dbhelpers.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/json.h"
#include "mongo/db/pdfile.h"
#include "mongo/platform/random.h"
#include "mongo/util/md5.hpp"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
static bool _areNonceAuthenticateCommandsEnabled = true;
static const char _nonceAuthenticateCommandsDisabledMessage[] =
"Challenge-response authentication using getnonce and authenticate commands is disabled.";
void CmdAuthenticate::disableCommand() { _areNonceAuthenticateCommandsEnabled = false; }
/* 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 requiresAuth() { return false; }
virtual bool logTheOp() { return false; }
virtual bool slaveOk() const {
return true;
}
void help(stringstream& h) const { h << "internal"; }
virtual LockType locktype() const { return NONE; }
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {} // No auth required
bool run(const string&, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
if (!_areNonceAuthenticateCommandsEnabled) {
errmsg = _nonceAuthenticateCommandsDisabledMessage;
return false;
}
nonce64 n = _random->nextInt64();
stringstream ss;
ss << hex << n;
result.append("nonce", ss.str() );
ClientBasic::getCurrent()->resetAuthenticationSession(
new MongoAuthenticationSession(n));
return true;
}
SecureRandom* _random;
} cmdGetNonce;
CmdLogout cmdLogout;
Status authenticateAndAuthorizePrincipal(const std::string& principalName,
const std::string& dbname,
const BSONObj& userObj) {
AuthorizationManager* authorizationManager =
ClientBasic::getCurrent()->getAuthorizationManager();
Principal* principal = new Principal(PrincipalName(principalName, dbname));
authorizationManager->addAuthorizedPrincipal(principal);
return authorizationManager->acquirePrivilegesFromPrivilegeDocument(dbname,
principal->getName(),
userObj);
}
bool CmdAuthenticate::run(const string& dbname , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
if (!_areNonceAuthenticateCommandsEnabled) {
errmsg = _nonceAuthenticateCommandsDisabledMessage;
return false;
}
log() << " authenticate db: " << dbname << " " << cmdObj << endl;
string user = cmdObj.getStringField("user");
string key = cmdObj.getStringField("key");
string received_nonce = cmdObj.getStringField("nonce");
if( user.empty() || key.empty() || received_nonce.empty() ) {
log() << "field missing/wrong type in received authenticate command "
<< dbname
<< endl;
errmsg = "auth fails";
sleepmillis(10);
return false;
}
stringstream digestBuilder;
{
bool reject = false;
ClientBasic *client = ClientBasic::getCurrent();
AuthenticationSession *session = client->getAuthenticationSession();
if (!session || session->getType() != AuthenticationSession::SESSION_TYPE_MONGO) {
reject = true;
LOG(1) << "auth: No pending nonce" << endl;
}
else {
nonce64 nonce = static_cast<MongoAuthenticationSession*>(session)->getNonce();
digestBuilder << hex << nonce;
reject = digestBuilder.str() != received_nonce;
if ( reject ) {
LOG(1) << "auth: Authentication failed for " << dbname << '$' << user << endl;
}
}
client->resetAuthenticationSession(NULL);
if ( reject ) {
log() << "auth: bad nonce received or getnonce not called. could be a driver bug or a security attack. db:" << dbname << endl;
errmsg = "auth fails";
sleepmillis(30);
return false;
}
}
BSONObj userObj;
string pwd;
Status status = ClientBasic::getCurrent()->getAuthorizationManager()->getPrivilegeDocument(
dbname, PrincipalName(user, dbname), &userObj);
if (!status.isOK()) {
log() << status.reason() << std::endl;
errmsg = status.reason();
return false;
}
pwd = userObj["pwd"].String();
md5digest d;
{
digestBuilder << user << 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 ) {
log() << "auth: key mismatch " << user << ", ns:" << dbname << endl;
errmsg = "auth fails";
return false;
}
status = authenticateAndAuthorizePrincipal(user, dbname, userObj);
uassert(16500,
mongoutils::str::stream() << "Problem acquiring privileges for principal \""
<< user << "\": " << status.reason(),
status == Status::OK());
bool readOnly = userObj["readOnly"].trueValue();
// TODO: remove this once all auth checking goes through AuthorizationManager instead of
// AuthenticationInfo
authenticate(dbname, user, readOnly );
result.append( "dbname" , dbname );
result.append( "user" , user );
result.appendBool( "readOnly" , readOnly );
return true;
}
CmdAuthenticate cmdAuthenticate;
} // namespace mongo