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/* Copyright © 2005-2013 Roger Leigh <rleigh@debian.org>
*
* schroot 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 3 of the License, or
* (at your option) any later version.
*
* schroot 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, see
* <http://www.gnu.org/licenses/>.
*
*********************************************************************/
#include <config.h>
#include <sbuild/auth/deny.h>
#include <cassert>
#include <cerrno>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <sstream>
#include <syslog.h>
#include <boost/format.hpp>
using std::cerr;
using std::endl;
using boost::format;
namespace sbuild
{
namespace auth
{
deny::deny (const std::string& service_name):
auth(service_name),
initialised(false)
{
}
deny::~deny ()
{
// Shutdown PAM.
try
{
stop();
}
catch (const error& e)
{
log_exception_error(e);
}
}
auth::ptr
deny::create (const std::string& service_name)
{
return ptr(new deny(service_name));
}
environment
deny::get_auth_environment () const
{
return get_minimal_environment();
}
void
deny::start ()
{
assert(!this->user.empty());
if (this->initialised)
{
log_debug(DEBUG_CRITICAL)
<< "pam_start FAIL (already initialised)" << endl;
throw error("Init PAM", PAM_DOUBLE_INIT);
}
this->initialised = true;
}
void
deny::stop ()
{
this->initialised = false;
}
void
deny::authenticate (status auth_status)
{
assert(this->initialised); // PAM must be initialised
switch (auth_status)
{
case STATUS_NONE:
break;
case STATUS_USER:
// We don't support user authentication, so throw an error if
// the user is not root. i.e. Only root->root is permitted.
// All other authentication attempts fail. Note that this could
// be used to escape pam_rootok restrictions on systems with PAM
// also available and pam_rootok not enabled.
if (this->ruid != 0)
throw error(AUTHENTICATION, strerror(ENOTSUP));
break;
case STATUS_FAIL:
{
log_debug(DEBUG_INFO) << "PAM auth premature FAIL" << endl;
syslog(LOG_AUTH|LOG_WARNING,
"%s->%s Unauthorised",
this->ruser.c_str(), this->user.c_str());
error e(AUTHORISATION);
// TRANSLATORS: %1% = program name (PAM service name)
std::string reason(_("You do not have permission to access the %1% service."));
reason += '\n';
reason += _("This failure will be reported.");
format fmt(reason);
fmt % this->service;
e.set_reason(fmt.str());
throw e;
}
default:
break;
}
}
bool
deny::is_initialised () const
{
return this->initialised;
}
}
}
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