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radiusplugin.cpp
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radiusplugin.cpp
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/*
* radiusplugin -- An OpenVPN plugin for do radius authentication
* and accounting.
*
* Copyright (C) 2005 EWE TEL GmbH/Ralf Luebben <ralfluebben@gmx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
//The callback functions of the plugin infrastructure.
#include "radiusplugin.h"
#define NEED_LIBGCRYPT_VERSION "1.2.0"
GCRY_THREAD_OPTION_PTHREAD_IMPL;
//define extern "C", so the c++ compiler generate a shared library
//which is compatible with c programms
extern "C"
{
/** The function is needed by the OpenVpn plugin model. The function is called
* when OpenVpn starts. In this case here two background process are
* started. One for authentication and one for accounting. The communication
* between the processes is made via sockets.
* You need a background process for accounting, because the interval
* in which accounting information is sent to the radius server in undependent
* from the main OpenVpn-process, so it is done by another process which schedule
* the accounting intervals. This process holds his root rights and it can set and
* deletes routes in the system routing table.
* The authentication process is a own process, too. So there is clear separation
* and it is undependent from the openvpn process.
* @param The type of plugin, maybe client_connect, client_disconnect, user_auth_pass_verify...
* @param A list of arguments which are set in the configuration file of openvpn in plugin line.
* @param The list of environmental variables, it is created by the OpenVpn-Process.
*/
//OPENVPN_EXPORT openvpn_plugin_handle_t
//openvpn_plugin_open_v1 ( unsigned int *type_mask, const char *argv[], const char *envp[] )
OPENVPN_PLUGIN_DEF openvpn_plugin_handle_t OPENVPN_PLUGIN_FUNC(openvpn_plugin_open_v2)(unsigned int *type_mask,
const char *argv[],
const char *envp[],
struct openvpn_plugin_string_list **return_list)
{
pid_t pid; /**<process number*/
int fd_auth[2]; /**<An array for the socket pair of the authentication process.*/
int fd_acct[2]; /**<An array for the socket pair of the accounting process.*/
AccountingProcess Acct; /**<The accounting background process object.*/
AuthenticationProcess Auth; /**<The authentication background process object.*/
PluginContext *context=NULL; /**<The context for this functions.*/
//list for additional arguments
struct name_value_list name_value_list;
//There must be one param, the name of the plugin file
const int base_parms = 1;
//Create the context.
try{
context=new PluginContext;
}
catch(...){
cerr << getTime() << "RADIUS-PLUGIN: New failed for PluginContext.\n";
return NULL;
}
// Get verbosity level from the environment.
const char *verb_string = get_env ( "verb", envp );
if ( verb_string )
context->setVerbosity ( atoi ( verb_string ) );
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: Start AUTH-RADIUS-PLUGIN\n";
// Make sure we have one string argument: the .so name.
if ( string_array_len ( argv ) < base_parms )
{
cerr << getTime() << "RADIUS-PLUGIN: no .so name\n";
goto error;
}
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: Found "<< string_array_len ( argv ) << " params.\n";
// See if we have optional name/value pairs for
// the plugin, this can only be the config file.
// path (default: -c /etc/openvpn/radiusplugin.conf)
name_value_list.len = 0;
if ( string_array_len ( argv ) > base_parms )
{
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: Find params.\n";
//just a work around because argv[1] is the filename
name_value_list.data[0].name = "-c";
name_value_list.data[0].value = argv[1];
if ( strncmp ( name_value_list.data[0].name,"-c",2 ) ==0 )
{
//see in ./RadiusClass/error.h for errornumbers
//parse the radiusplugin config file
cerr << getTime() << "RADIUS-PLUGIN: Configfile name: "<< name_value_list.data[0].value << ".\n";
if ( context->radiusconf.parseConfigFile ( name_value_list.data[0].value ) !=0 or context->conf.parseConfigFile ( name_value_list.data[0].value ) !=0 )
{
cerr << getTime() << "RADIUS-PLUGIN: Bad config file or error in config.\n";
goto error;
}
}
else
{
cerr << getTime() << "RADIUS-PLUGIN: Bad argument for plugin.\n";
goto error;
}
}
else
{
//if there is no filename, use the default
//parse the radiusplugin config file
cerr << getTime() << "RADIUS-PLUGIN: Configfile name: /etc/openvpn/radiusplugin.cnf.\n";
if ( context->radiusconf.parseConfigFile ( "/etc/openvpn/radiusplugin.cnf" ) !=0 or context->conf.parseConfigFile ( "/etc/openvpn/radiusplugin.cnf" ) !=0 )
{
cerr << getTime() << "RADIUS-PLUGIN: Bad config file or error in config.\n";
goto error;
}
}
// Intercept the --auth-user-pass-verify, --client-connect and --client-disconnect callback.
if (context->conf.getAccountingOnly()==false)
{
*type_mask = OPENVPN_PLUGIN_MASK ( OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY ) | OPENVPN_PLUGIN_MASK ( OPENVPN_PLUGIN_CLIENT_CONNECT ) | OPENVPN_PLUGIN_MASK ( OPENVPN_PLUGIN_CLIENT_DISCONNECT );
}
else //just do the accounting
{
*type_mask = OPENVPN_PLUGIN_MASK ( OPENVPN_PLUGIN_CLIENT_CONNECT ) | OPENVPN_PLUGIN_MASK ( OPENVPN_PLUGIN_CLIENT_DISCONNECT );
}
// Make a socket for foreground and background processes
// to communicate.
//Authentication process:
if ( socketpair ( PF_UNIX, SOCK_DGRAM, 0, fd_auth ) == -1 )
{
cerr << getTime() << "RADIUS-PLUGIN: socketpair call failed for authentication process\n";
goto error;
}
//Accounting process:
if ( socketpair ( PF_UNIX, SOCK_DGRAM, 0, fd_acct ) == -1 )
{
cerr << getTime() << "RADIUS-PLUGIN: socketpair call failed for accounting process\n";
goto error;
}
// Fork off the privileged processes. It will remain privileged
// even after the foreground process drops its privileges.
// Fork the authentication process
pid = fork ();
if ( pid )
{
// Foreground Process (Parent)
int status;
//save the process id
context->setAuthPid ( pid );
// close our copy of child's socket
close ( fd_auth[1] );
/* don't let future subprocesses inherit child socket */
if ( fcntl ( fd_auth[0], F_SETFD, FD_CLOEXEC ) < 0 )
cerr << getTime() << "RADIUS-PLUGIN: Set FD_CLOEXEC flag on socket file descriptor failed\n";
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: Start BACKGROUND Process for authentication with PID " << context->getAuthPid() << ".\n";
//save the socket number in the context
context->authsocketbackgr.setSocket ( fd_auth[0] );
//wait for background child process to initialize */
status = context->authsocketbackgr.recvInt();
if ( status != RESPONSE_INIT_SUCCEEDED )
{
//set the socket to -1 if the initialization failed
context->authsocketbackgr.setSocket ( -1 );
}
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: Start AUTH-RADIUS-PLUGIN\n";
}
else
{
//Background Process
// close all parent fds except our socket back to parent
close_fds_except ( fd_auth[1] );
// Ignore most signals (the parent will receive them)
set_signals ();
//save the socket number in the context
context->authsocketforegr.setSocket ( fd_auth[1] );
//start the backgroung event loop for accounting
Auth.Authentication ( context );
//close the socket
close ( fd_auth[1] );
//free the context of the background process
delete context;
exit ( 0 );
return 0; // NOTREACHED
}
// Fork the accounting process
pid = fork ();
if ( pid )
{
// Foreground Process (Parent)
int status; //status if the background process
//save the pid
context->setAcctPid ( pid );
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: Start BACKGROUND Process for accounting with PID " << context->getAcctPid() << ".\n";
// close our copy of child's socket */
close ( fd_acct[1] );
/* don't let future subprocesses inherit child socket */
if ( fcntl ( fd_acct[0], F_SETFD, FD_CLOEXEC ) < 0 )
cerr << getTime() << "RADIUS-PLUGIN: Set FD_CLOEXEC flag on socket file descriptor failed\n";
//save the socket number in the context
context->acctsocketbackgr.setSocket ( fd_acct[0] );
// wait for background child process to initialize */
status = context->acctsocketbackgr.recvInt();
if ( status != RESPONSE_INIT_SUCCEEDED )
{
//set the socket to -1 if the initialization failed
context->acctsocketbackgr.setSocket ( -1 );
}
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: Start AUTH-RADIUS-PLUGIN\n";
}
else
{
//Background Process
// close all parent fds except our socket back to parent
close_fds_except ( fd_acct[1] );
// Ignore most signals (the parent will receive them)
set_signals ();
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: Start BACKGROUND Process for accounting\n";
// save the socket in the context
context->acctsocketforegr.setSocket ( fd_acct[1] );
//start the backgroung event loop for accounting
Acct.Accounting ( context );
//close the socket
close ( fd_acct[1] );
//free the context of the background process
delete context;
exit ( 0 );
return 0; // NOTREACHED
}
//return the context, this is used between the functions
//openvpn_plugin_open_v1
//openvpn_plugin_func_v1
//openvpn_plugin_close_v1
return ( openvpn_plugin_handle_t ) context;
error:
//delete the context
if ( context )
delete ( context );
return NULL;
}
/** This function is called from the OpenVpn process every time
* a event happens. The function handle the events (plugins)
* AUTH_USER_PASS_VERIFY, CLIENT_CONNECT, CLIENT_DISCONNECT.
* The function reads the information from the envriomental
* variable and sends the relevant information to the
* background processes.
* AUTH_USER_PASS_VERIFY: The user is authenticated by a radius server,
* if it succeeded the background sends back the framed ip, the routes and the acct_interim_interval
* for the user. Than the user is added to the context.
* CLIENT_CONNECT: The user is added to the accounting by
* sending the information to the background process.
* CLIENT_DISCONNECT: The user is deleted from the
* accounting by sending the information to the backgrund process.
* @param The handle which was allocated in the open function.
* @param The type of plugin, maybe client_connect, client_disconnect, auth_user_pass_verify
* @param A list of arguments which are set in the openvpn configuration file.
* @param The list of environmental variables, it is created by the OpenVpn-Process.
* @return An integer with the status of the function (OPENVPN_PLUGIN_FUNC_SUCCESS or OPENVPN_PLUGIN_FUNC_ERROR).
*/
//OPENVPN_EXPORT int
//openvpn_plugin_func_v1 ( openvpn_plugin_handle_t handle, const int type, const char *argv[], const char *envp[] )
OPENVPN_PLUGIN_DEF int OPENVPN_PLUGIN_FUNC(openvpn_plugin_func_v2)
(openvpn_plugin_handle_t handle,
const int type,
const char *argv[],
const char *envp[],
void *per_client_context,
struct openvpn_plugin_string_list **return_list)
{
//restore the context which was created at the function openvpn_plugin_open_v1
PluginContext *context = ( struct PluginContext * ) handle;
if (context->getStartThread())
{
pthread_cond_init (context->getCondSend(), NULL);
pthread_mutex_init (context->getMutexSend(), NULL);
pthread_cond_init (context->getCondRecv(), NULL);
pthread_mutex_init (context->getMutexRecv(), NULL);
pthread_cond_init (context->getAcctCondSend(), NULL);
pthread_mutex_init (context->getAcctMutexSend(), NULL);
pthread_cond_init (context->getAcctCondRecv(), NULL);
pthread_mutex_init (context->getAcctMutexRecv(), NULL);
if (pthread_create(context->getAcctThread(), NULL, &client_connect, (void *) context) != 0)
{
cerr << getTime() << "RADIUS-PLUGIN: client_connect thread creation failed.\n";
return OPENVPN_PLUGIN_FUNC_ERROR;
//goto error;
}
if (context->conf.getAccountingOnly()==false && pthread_create(context->getThread(), NULL, &auth_user_pass_verify, (void *) context) != 0)
{
cerr << getTime() << "RADIUS-PLUGIN: auth_user_pass_verify thread creation failed.\n";
return OPENVPN_PLUGIN_FUNC_ERROR;
//goto error;
}
pthread_mutex_lock(context->getMutexRecv());
context->setStartThread(false);
pthread_mutex_unlock(context->getMutexRecv());
}
UserPlugin *newuser=NULL; /**< A context for an new user.*/
UserPlugin *tmpuser=NULL; /**< A context for an temporary user.*/
string common_name; /**<A string for the common_name from the environment.*/
string untrusted_ip; /** untrusted_ip for ipv6 support **/
///////////// OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY
if ( type == OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY && ( context->authsocketbackgr.getSocket() ) >= 0 )
{
if ( DEBUG ( context->getVerbosity() ) )
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND: OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY is called."<< endl;
}
try
{
newuser=new UserPlugin();
get_user_env(context,type,envp, newuser);
if (newuser->getAuthControlFile().length() > 0 && context->conf.getUseAuthControlFile())
{
pthread_mutex_lock(context->getMutexSend());
context->addNewUser(newuser);
pthread_cond_signal( context->getCondSend( ));
pthread_mutex_unlock (context->getMutexSend());
return OPENVPN_PLUGIN_FUNC_DEFERRED;
}
else
{
pthread_mutex_lock(context->getMutexRecv());
pthread_mutex_lock(context->getMutexSend());
context->addNewUser(newuser);
pthread_cond_signal( context->getCondSend( ));
pthread_mutex_unlock (context->getMutexSend());
pthread_cond_wait( context->getCondRecv(), context->getMutexRecv());
pthread_mutex_unlock (context->getMutexRecv());
return context->getResult();
}
}
catch ( Exception &e )
{
cerr << getTime() << e;
}
catch (std::bad_alloc)
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND: New failed on UserPlugin in OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY" << endl;
}
catch ( ... )
{
cerr << getTime() << "Unknown Exception!";
}
return OPENVPN_PLUGIN_FUNC_ERROR;
/////////////////////////// CLIENT_CONNECT
}
if ( type == OPENVPN_PLUGIN_CLIENT_CONNECT && context->acctsocketbackgr.getSocket() >= 0 )
{
if ( DEBUG ( context->getVerbosity() ) )
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND: OPENVPN_PLUGIN_CLIENT_CONNECT is called.\n";
}
try
{
tmpuser=new UserPlugin();
get_user_env(context,type,envp, tmpuser);
if (tmpuser->getClientConnectDeferFile().length() > 0 && context->conf.getUseClientConnectDeferFile())
{
pthread_mutex_lock(context->getAcctMutexSend());
context->addNewAcctUser(tmpuser);
pthread_cond_signal( context->getAcctCondSend( ));
pthread_mutex_unlock (context->getAcctMutexSend());
return OPENVPN_PLUGIN_FUNC_DEFERRED;
}
else
{
pthread_mutex_lock(context->getAcctMutexRecv());
pthread_mutex_lock(context->getAcctMutexSend());
context->addNewAcctUser(tmpuser);
pthread_cond_signal( context->getAcctCondSend( ));
pthread_mutex_unlock (context->getAcctMutexSend());
pthread_cond_wait( context->getAcctCondRecv(), context->getAcctMutexRecv());
pthread_mutex_unlock (context->getAcctMutexRecv());
return context->getResult();
}
}
catch ( Exception &e )
{
cerr << getTime() << e;
}
catch (std::bad_alloc)
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND: New failed on UserPlugin in OPENVPN_PLUGIN_CLIENT_CONNECT" << endl;
}
catch ( ... )
{
cerr << getTime() << "Unknown Exception!";
}
return OPENVPN_PLUGIN_FUNC_ERROR;
}
///////////////////////// OPENVPN_PLUGIN_CLIENT_DISCONNECT
if ( type == OPENVPN_PLUGIN_CLIENT_DISCONNECT && context->acctsocketbackgr.getSocket() >= 0 )
{
if ( DEBUG ( context->getVerbosity() ) )
{
cerr << getTime() << "\n\nRADIUS-PLUGIN: FOREGROUND: OPENVPN_PLUGIN_CLIENT_DISCONNECT is called.\n";
}
try
{
tmpuser=new UserPlugin();
get_user_env(context,type,envp, tmpuser);
//find the user in the context, he was added at the OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY
//string key=common_name + string ( "," ) +untrusted_ip+string ( ":" ) + string ( get_env ( "untrusted_port", envp ) );
newuser=context->findUser(tmpuser->getKey());
delete(tmpuser);
if ( newuser!=NULL )
{
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND: Delete user from accounting: commonname: " << newuser->getKey() << "\n";
//send the information to the background process
context->acctsocketbackgr.send ( DEL_USER );
context->acctsocketbackgr.send ( newuser->getKey() );
if ( get_env ( "bytes_sent", envp ) !=NULL ){
context->acctsocketbackgr.send(get_env("bytes_sent", envp));
}else{
context->acctsocketbackgr.send("0");
}
if ( get_env ( "bytes_received", envp ) !=NULL ){
context->acctsocketbackgr.send(get_env("bytes_received", envp));
}else{
context->acctsocketbackgr.send("0");
}
//get the response
const int status = context->acctsocketbackgr.recvInt();
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND: Accounting for user with key" << newuser->getKey() << " stopped!\n";
//free the nasport
context->delNasPort ( newuser->getPortnumber() );
//delete user from context
context->delUser ( newuser->getKey() );
return OPENVPN_PLUGIN_FUNC_SUCCESS;
}
else
{
throw Exception ( "No user with this common_name!\n" );
}
}
catch ( Exception &e )
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND:" << e;
}
catch (std::bad_alloc)
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND: New failed on UserPlugin in OPENVPN_PLUGIN_CLIENT_DISCONNECT" << endl;
}
catch ( ... )
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND:" << "Unknown Exception!\n";
}
}
return OPENVPN_PLUGIN_FUNC_ERROR;
}
/** The function is called when the OpenVpn process exits.
* A exit command is send to the background processes and
* the context is freed which was allocted in the open function.
* @param The handle which was allocated in the open function.
*/
OPENVPN_PLUGIN_DEF void OPENVPN_PLUGIN_FUNC(openvpn_plugin_close_v1)(openvpn_plugin_handle_t handle)
{
//restore the context
PluginContext *context = ( PluginContext * ) handle;
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND: close\n";
if ( context->authsocketbackgr.getSocket() >= 0 )
{
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND: close auth background process\n";
//tell background process to exit
try
{
context->authsocketbackgr.send ( COMMAND_EXIT );
}
catch ( Exception &e )
{
cerr << getTime() << e;
}
catch ( ... )
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND:" << "Unknown Exception!\n";
}
// wait for background process to exit
if ( context->getAuthPid() > 0 )
waitpid ( context->getAuthPid(), NULL, 0 );
}
if ( context->acctsocketbackgr.getSocket() >= 0 )
{
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND: close acct background process.\n";
//tell background process to exit
try
{
context->acctsocketbackgr.send ( COMMAND_EXIT );
}
catch ( Exception &e )
{
cerr << getTime() << e;
}
catch ( ... )
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND:" << "Unknown Exception!\n";
}
// wait for background process to exit
if ( context->getAcctPid() > 0 )
waitpid ( context->getAcctPid(), NULL, 0 );
}
if (context->getStartThread()==false) //means the thread is running
{
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND: Stop auth thread .\n";
//stop the threads
pthread_mutex_lock(context->getMutexSend());
context->setStopThread(true);
pthread_cond_signal( context->getCondSend( ));
pthread_mutex_unlock(context->getMutexSend());
pthread_mutex_lock(context->getAcctMutexSend());
pthread_cond_signal( context->getAcctCondSend( ));
pthread_mutex_unlock(context->getAcctMutexSend());
//wait for the thread to exit
if (context->conf.getAccountingOnly()==false)
pthread_join(*context->getThread(),NULL);
pthread_join(*context->getAcctThread(),NULL);
pthread_cond_destroy(context->getCondSend( ));
pthread_cond_destroy(context->getCondRecv( ));
pthread_mutex_destroy(context->getMutexSend());
pthread_mutex_destroy(context->getMutexRecv());
pthread_cond_destroy(context->getAcctCondSend( ));
pthread_cond_destroy(context->getAcctCondRecv( ));
pthread_mutex_destroy(context->getAcctMutexSend());
pthread_mutex_destroy(context->getAcctMutexRecv());
}
else
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND: Auth and Acct threads were not started so far.\n";
}
delete context;
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND: DONE.\n";
}
}
/** Original function from the openvpn auth-pam plugin.
* Given an environmental variable name, search
* the envp array for its value, returning it
* if found or NULL otherwise.
* A field in the envp-array looks like: name=user1
* @param The name of the variable.
* @param The array with the environmental variables.
* @return A poniter to the variable value or NULL, if the varaible was not found.
*/
const char * get_env ( const char *name, const char *envp[] )
{
if ( envp )
{
int i;
const int namelen = strlen ( name );
for ( i = 0; envp[i]; ++i )
{
//compare the environmental names
if ( !strncmp ( envp[i], name, namelen ) )
{
//if the varibale is found
const char *cp = envp[i] + namelen;
//return the value behind the =
if ( *cp == '=' )
return cp + 1;
}
}
}
return NULL;
}
/** Original function from the openvpn auth-pam plugin.
* Return the length of a string array.
* @param Array
* @return The length of the arry.
*/
int string_array_len ( const char *array[] )
{
int i = 0;
if ( array )
{
while ( array[i] )
++i;
}
return i;
}
/** Original function from the openvpn auth-pam plugin.
* Close most of parent's fds.
* Keep stdin/stdout/stderr, plus one
* other fd which is presumed to be
* our pipe back to parent.
* Admittedly, a bit of a kludge,
* but posix doesn't give us a kind
* of FD_CLOEXEC which will stop
* fds from crossing a fork().
* @param The socket number which should not be closed.
*/
void close_fds_except ( int keep )
{
int i;
closelog ();
for ( i = 3; i <= 100; ++i )
{
if ( i != keep )
close ( i );
}
}
/** Original function from the openvpn auth-pam plugin.
* Usually we ignore signals, because our parent will
* deal with them.
*/
void set_signals ( void )
{
signal ( SIGTERM, SIG_DFL );
signal ( SIGINT, SIG_IGN );
signal ( SIGHUP, SIG_IGN );
signal ( SIGUSR1, SIG_IGN );
signal ( SIGUSR2, SIG_IGN );
signal ( SIGPIPE, SIG_IGN );
}
/** The function creates a md5 hash string as session ID over
* - user->commonname
* - user->callingstationid
* - user->untrustedport
* - time string from ctime(...)
* @param A pointer to the user for which the session ID is created.
* @return A string with the hash.
*/
string createSessionId ( UserPlugin * user )
{
unsigned char digest[16];
char text[33]; //The digest.
gcry_md_hd_t context; //the hash context
int i;
time_t rawtime;
string strtime;
ostringstream portnumber;
memset ( digest,0,16 );
if (!gcry_control (GCRYCTL_ANY_INITIALIZATION_P))
{ /* No other library has already initialized libgcrypt. */
gcry_control(GCRYCTL_SET_THREAD_CBS,&gcry_threads_pthread);
if (!gcry_check_version (NEED_LIBGCRYPT_VERSION) )
{
cerr << "libgcrypt is too old (need " << NEED_LIBGCRYPT_VERSION << ", have " << gcry_check_version (NULL) << ")\n";
}
/* Disable secure memory. */
gcry_control (GCRYCTL_DISABLE_SECMEM, 0);
gcry_control (GCRYCTL_INITIALIZATION_FINISHED);
}
//build the hash
gcry_md_open ( &context, GCRY_MD_MD5, 0 );
gcry_md_write ( context, user->getCommonname().c_str(), user->getCommonname().length() );
gcry_md_write ( context, user->getCallingStationId().c_str(), user->getCallingStationId().length() );
gcry_md_write ( context, user->getUntrustedPort().c_str(), user->getUntrustedPort().length() );
gcry_md_write ( context, user->getUntrustedPort().c_str(), user->getUntrustedPort().length() );
portnumber << user->getPortnumber();
gcry_md_write ( context,portnumber.str().c_str(), portnumber.str().length());
time ( &rawtime );
strtime=ctime ( &rawtime );
gcry_md_write ( context, strtime.c_str(),strtime.length() );
memcpy ( digest, gcry_md_read ( context, GCRY_MD_MD5 ), 16 );
gcry_md_close ( context );
unsigned int h,l;
char *p=text;
unsigned char *c=digest;
for ( i=0; i<16; i++ )
{
h = *c / 16;
l = *c % 16;
c++;
*p++ = "01234567890ABCDEF"[h];
*p++ = "01234567890ABCDEF"[l];
}
text[32]='\0';
return string ( text );
}
/** The function implements the thread for authentication. If the auth_control_file is specified the thread writes the results in the
* auth_control_file, if the file is not specified the thread forward the OPENVPN_PLUGIN_FUNC_SUCCESS or OPENVPN_PLUGIN_FUNC_ERROR
* to the main process.
* @param _context The context pointer from OpenVPN.
*/
void * auth_user_pass_verify(void * c)
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: Auth_user_pass_verify thread started."<< endl;
PluginContext * context = (PluginContext *) c;
//pthread_mutex_lock(context->getMutexSend());
//main thread loop for authentication
//ignore signals
static sigset_t signal_mask;
sigemptyset (&signal_mask);
sigaddset (&signal_mask, SIGINT);
sigaddset (&signal_mask, SIGTERM);
sigaddset (&signal_mask, SIGHUP);
sigaddset (&signal_mask, SIGUSR1);
sigaddset (&signal_mask, SIGUSR2);
sigaddset (&signal_mask, SIGPIPE);
pthread_sigmask (SIG_BLOCK, &signal_mask, NULL);
while (!context->getStopThread())
{
pthread_mutex_lock(context->getMutexSend());
if (context->UserWaitingtoAuth()==false)
{
if ( DEBUG ( context->getVerbosity() ) ) cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: Waiting for new user." << endl;
cout.flush();
pthread_cond_wait(context->getCondSend(),context->getMutexSend());
}
pthread_mutex_unlock(context->getMutexSend());
if (context->getStopThread()==true)
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: Stop signal received." << endl;
break;
}
if ( DEBUG ( context->getVerbosity() ) ) cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: New user from OpenVPN!" << endl;
//is the user already known?
UserPlugin *olduser=NULL; /**<A context for an already known user.*/
UserPlugin *newuser=NULL; /**<A context for the new user.*/
newuser = context->getNewUser();
olduser=context->findUser ( newuser->getKey() );
if ( olduser!=NULL ) //probably key renegotiation
{
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: Renegotiation: username: "<< olduser->getUsername()
<< "\nRADIUS-PLUGIN: FOREGROUND THREAD:\t olduser ip: " << olduser->getCallingStationId()
<< "\nRADIUS-PLUGIN: FOREGROUND THREAD:\t olduser port: " << olduser->getUntrustedPort()
<< "\nRADIUS-PLUGIN: FOREGROUND THREAD:\t olduser FramedIP: " << olduser->getFramedIp()
<< "\nRADIUS-PLUGIN: FOREGROUND THREAD:\t newuser ip: " << olduser->getCallingStationId()
<< "\nRADIUS-PLUGIN: FOREGROUND THREAD:\t newuser port: " << olduser->getUntrustedPort()
<< "\n";
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: isAuthenticated()" << olduser->isAuthenticated();
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: isAcct()" << olduser->isAccounted();
// update password and username, can happen when a new connection is established from the same client with the same port before the timeout in the openvpn server occurs!
olduser->setPassword(newuser->getPassword());
olduser->setUsername(newuser->getUsername());
olduser->setAuthControlFile(newuser->getAuthControlFile());
//delete the newuser and use the olduser
delete newuser;
newuser=olduser;
//TODO: for threading check if the user is already accounted (He must be for renegotiation)
}
else //new user for authentication, no renegotiation
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: New user." << endl;
newuser->setPortnumber ( context->addNasPort() );
newuser->setSessionId ( createSessionId ( newuser ) );
//add the user to the context
context->addUser(newuser);
}
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: New user: username: "<< newuser->getUsername() <<", password: *****"
<< ", newuser ip: " << newuser->getCallingStationId()
<< ", newuser port: " << newuser->getUntrustedPort() << " ." << endl;
//there must be a username
if ( newuser->getUsername().size() > 0 ) //&& olduser==NULL)
{
//send the informations to the background process
context->authsocketbackgr.send ( COMMAND_VERIFY );
context->authsocketbackgr.send ( newuser->getUsername() );
context->authsocketbackgr.send ( newuser->getPassword() );
context->authsocketbackgr.send ( newuser->getDev() );
context->authsocketbackgr.send ( newuser->getPortnumber() );
context->authsocketbackgr.send ( newuser->getSessionId() );
context->authsocketbackgr.send ( newuser->getCallingStationId() );
context->authsocketbackgr.send ( newuser->getCommonname() );
context->authsocketbackgr.send ( newuser->getFramedIp() );
//get the response
const int status = context->authsocketbackgr.recvInt();
if ( status == RESPONSE_SUCCEEDED )
{
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: Authentication succeeded!" << endl;
//get the routes from background process
newuser->setFramedRoutes ( context->authsocketbackgr.recvStr() );
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: Received routes for user: "<< newuser->getFramedRoutes() << "." << endl;
//get the framed ip
newuser->setFramedIp ( context->authsocketbackgr.recvStr() );
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: Received framed ip for user: "<< newuser->getFramedIp() << "." << endl;
//get the routes from background process
newuser->setFramedRoutes6 ( context->authsocketbackgr.recvStr() );
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: Received IPv6 routes for user: "<< newuser->getFramedRoutes6() << ".\n";
//get the framed IPv6
newuser->setFramedIp6 ( context->authsocketbackgr.recvStr() );
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: Received framed IPv6 for user: "<< newuser->getFramedIp6() << "." << endl;
// get the interval from the background process
newuser->setAcctInterimInterval ( context->authsocketbackgr.recvInt() );
if ( DEBUG ( context->getVerbosity() ) )
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: Receive acctinteriminterval " << newuser->getAcctInterimInterval() <<" sec from backgroundprocess." << endl;
//clear the buffer if it isn't empty
if ( newuser->getVsaBuf() !=NULL )
{
delete [] newuser->getVsaBuf();
newuser->setVsaBuf ( NULL );
}
// get the vendor specific attribute buffer from the background process
context->authsocketbackgr.recvBuf ( newuser );
//add the user to the context
// if the is already in the map, addUser will throw an exception
// only add the user if he it not known already
if ( newuser->isAuthenticated() ==false )
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: Add user to map." << endl;
//save the success
newuser->setAuthenticated ( true );
}
else if ( newuser->isAuthenticated() && olduser!=NULL )
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: Don't add the user to the map, it is a rekeying." << endl;
}
if (newuser->getAuthControlFile().length()>0 && context->conf.getUseAuthControlFile())
{
write_control_file(context, newuser->getAuthControlFile(), '1');
}
else
{
pthread_mutex_lock(context->getMutexRecv());
context->setResult(OPENVPN_PLUGIN_FUNC_SUCCESS);
pthread_cond_signal( context->getCondRecv( ));
pthread_mutex_unlock (context->getMutexRecv());
}
}
else //AUTH failed
{
/* should wait for disconnect call
if ( newuser->isAccounted() ) //user is already known, delete him from the accounting
{
cerr << getTime() << "RADIUS-PLUGIN: FOREGROUND THREAD: Error ar rekeying!" << endl;
//error on authenticate user at rekeying -> delete the user!