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//+======================================================================
// $Source$
//
// Project: Tango
//
// Description: Cpp source code for the AccessProxy class definition .
//
// $Author: taurel $
//
// Copyright (C) : 2004,2005,2006,2007,2008,2009,2010,2011,2012,2013
// European Synchrotron Radiation Facility
// BP 220, Grenoble 38043
// FRANCE
//
// This file is part of Tango.
//
// Tango is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Tango 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Tango. If not, see <http://www.gnu.org/licenses/>.
//
// $Revision: 22213 $
//
//-======================================================================
#if HAVE_CONFIG_H
#include <ac_config.h>
#endif
#include <tango.h>
#include <accessproxy.h>
#include <sys/types.h>
#ifndef _TG_WINDOWS_
#include <pwd.h>
#endif
namespace Tango
{
/**
* This class is extends TangoApi.DeviceProxy
* to manage Tango access device.
* - Check if control access is requested.
* - Check who is the user and the host.
* - Check access for this user, this host and the specified device.
*
* @author verdier
* @Revision
*/
//===============================================================
/**
* Constructor for Access device proxy
*
* @param devname access device name
*/
//===============================================================
AccessProxy::AccessProxy(string &devname) : DeviceProxy(devname,false),
forced(false)
{
real_ctor();
}
AccessProxy::AccessProxy(const char *devname) : DeviceProxy(devname,false),
forced(false)
{
real_ctor();
}
void AccessProxy::real_ctor()
{
//
// Check if forced mode
//
string super_tango;
int ret = get_env_var("SUPER_TANGO",super_tango);
if (ret == 0)
{
transform(super_tango.begin(),super_tango.end(),super_tango.begin(),::tolower);
if (super_tango == "true")
forced = true;
}
//
// Build device proxy and check if present.
//
if (forced == false)
ping();
set_access_control(ACCESS_WRITE);
}
//===============================================================
/**
* Check access for specified device
*
* @param devname device name to check access
*/
//===============================================================
AccessControlType AccessProxy::check_access_control(string &devname)
{
if (forced)
return ACCESS_WRITE;
bool multi_ip = true;
bool two_tries = false;
omni_mutex_lock oml(only_one);
while (two_tries == false)
{
try
{
//
// If not already done, get user name.
// I am using the effective UID in order to allow applications using the seteuid(0) system call
// to change the effective user id and therefore to take someone else rights
//
if (user.empty() == true)
{
#ifndef _TG_WINDOWS_
uid_t user_id = geteuid();
struct passwd pw;
struct passwd *pw_ptr;
char buffer[__AC_BUFFER_SIZE];
if (getpwuid_r(user_id,&pw,buffer,sizeof(buffer),&pw_ptr) != 0)
{
cerr << "AccessProxy::check_access_control: Can't get the user UID !" << endl;
cerr << "Access right set to ACCESS_READ" << endl;
return ACCESS_READ;
}
if (pw_ptr == NULL)
{
cerr << "AccessProxy::check_access_control: Can't get the user UID !" << endl;
cerr << "Access right set to ACCESS_READ" << endl;
return ACCESS_READ;
}
user = pw.pw_name;
transform(user.begin(),user.end(),user.begin(),::tolower);
#else
BOOL ret;
TCHAR buffer[128];
DWORD nb = 128;
ret = GetUserName(buffer,&nb);
if (ret == 0)
{
cerr << "AccessProxy::check_access_control: Can't get the user name !" << endl;
cerr << "Access right set to ACCESS_READ" << endl;
return ACCESS_READ;
}
user = buffer;
transform(user.begin(),user.end(),user.begin(),::tolower);
#endif
}
//
// If not already done, get host address
//
if (host_ips.empty() == true)
{
ApiUtil *au = ApiUtil::instance();
vector<string> adrs;
string at_least_one;
try
{
au->get_ip_from_if(adrs);
//
// Filter out local address and IP v6
//
for (unsigned int nb_adrs = 0;nb_adrs < adrs.size();nb_adrs++)
{
string &tmp_host = adrs[nb_adrs];
if (nb_adrs == 0)
at_least_one = tmp_host;
if (tmp_host.find("127.") == 0) {}
else if (tmp_host.find(":") != string::npos) {}
else
host_ips.push_back(tmp_host);
}
if (host_ips.empty() == true)
{
host_ips.push_back(at_least_one);
}
}
catch (DevFailed)
{
cerr << "AccessProxy::check_access_control: Can't get my IP address !" << endl;
cerr << "Access right set to ACCESS_READ" << endl;
return ACCESS_READ;
}
}
//
// Check for user and host rights on specified device
//
DeviceData din,dout;
DevVarStringArray dvsa;
if (multi_ip == true)
{
dvsa.length(2 + host_ips.size());
dvsa[0] = CORBA::string_dup(user.c_str());
dvsa[1] = CORBA::string_dup(devname.c_str());
for (unsigned int i = 0;i < host_ips.size();i++)
dvsa[2 + i] = CORBA::string_dup(host_ips[i].c_str());
din << dvsa;
dout = command_inout("GetAccessForMultiIp",din);
}
else
{
two_tries = true;
dvsa.length(3);
dvsa[0] = CORBA::string_dup(user.c_str());
dvsa[1] = CORBA::string_dup(host_ips[0].c_str());
dvsa[2] = CORBA::string_dup(devname.c_str());
din << dvsa;
dout = command_inout("GetAccess",din);
}
string right;
dout >> right;
if (right == "write")
return ACCESS_WRITE;
else
return ACCESS_READ;
}
catch (Tango::DevFailed &e)
{
if (::strcmp(e.errors[0].reason.in(),API_CommandNotFound) == 0)
{
multi_ip = false;
}
else if (::strcmp(e.errors[0].reason.in(),"API_DeviceNotExported") == 0)
{
Except::re_throw_exception(e,(const char *)API_CannotCheckAccessControl,
(const char *)"Cannot import Access Control device !",
(const char *)"AccessProxy::check_access_control()");
}
else
throw;
}
}
return ACCESS_READ;
}
//===============================================================
/**
* Check for specified device, the specified command is allowed.
*
* @param classname Specified device class name.
* @param cmd Specified command name.
*/
//===============================================================
bool AccessProxy::is_command_allowed(string &classname,string &cmd)
{
bool ret = false;
//
// Try to find allowed commands for device class in map
//
map<string,vector<string> >::iterator pos;
pos = allowed_cmd_table.find(classname);
//
// If allowed commands for this class not already in map, get them
//
vector<string> allowed;
if (pos == allowed_cmd_table.end())
get_allowed_commands(classname,allowed);
else
allowed = pos->second;
//
// If no cmd allowed returns false
//
if (allowed.empty() == true)
ret = false;
//
// Else, check is the one passed as argument is allowed
//
else
{
for (unsigned int i = 0;i < allowed.size();++i)
{
if (TG_strcasecmp(allowed[i].c_str(),cmd.c_str()) == 0)
{
ret = true;
break;
}
}
}
return ret;
}
//===============================================================
/**
* query access device to know allowed commands for the class
*/
//===============================================================
void AccessProxy::get_allowed_commands(string &classname,vector<string> &allowed)
{
try
{
DeviceData din,dout;
din << classname;
dout = command_inout("GetAllowedCommands", din);
dout >> allowed;
}
catch (Tango::DevFailed &)
{
allowed.clear();
}
allowed_cmd_table.insert(map<string,vector<string> >::value_type(classname, allowed));
}
} // End of Tango namespace
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