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/* SLiM - Simple Login Manager
Copyright (C) 2007 Martin Parm
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
(at your option) any later version.
*/
#include <string>
#include <iostream>
#include "PAM.h"
namespace PAM {
Exception::Exception(pam_handle_t* _pam_handle,
const std::string& _func_name,
int _errnum):
errnum(_errnum),
errstr(pam_strerror(_pam_handle, _errnum)),
func_name(_func_name)
{}
Exception::~Exception(void){}
Auth_Exception::Auth_Exception(pam_handle_t* _pam_handle,
const std::string& _func_name,
int _errnum):
Exception(_pam_handle, _func_name, _errnum){}
Cred_Exception::Cred_Exception(pam_handle_t* _pam_handle,
const std::string& _func_name,
int _errnum):
Exception(_pam_handle, _func_name, _errnum){}
int Authenticator::_end(void){
int result=pam_end(pam_handle, last_result);
pam_handle=0;
return result;
}
Authenticator::Authenticator(conversation* conv, void* data):
pam_handle(0),
last_result(PAM_SUCCESS)
{
pam_conversation.conv=conv;
pam_conversation.appdata_ptr=data;
}
Authenticator::~Authenticator(void){
if (pam_handle) _end();
}
void Authenticator::start(const std::string& service){
switch((last_result=pam_start(service.c_str(), NULL, &pam_conversation, &pam_handle))){
default:
throw Exception(pam_handle, "pam_start()", last_result);
case PAM_SUCCESS:
break;
}
return;
}
void Authenticator::end(void){
switch((last_result=_end())){
default:
throw Exception(pam_handle, "pam_end()", last_result);
case PAM_SUCCESS:
break;
}
return;
}
void Authenticator::set_item(const Authenticator::ItemType item, const void* value){
switch((last_result=pam_set_item(pam_handle, item, value))){
default:
_end();
throw Exception(pam_handle, "pam_set_item()", last_result);
case PAM_SUCCESS:
break;
}
return;
}
const void* Authenticator::get_item(const Authenticator::ItemType item){
const void* data;
switch ((last_result=pam_get_item(pam_handle, item, &data))){
default:
case PAM_SYSTEM_ERR:
#ifdef __LIBPAM_VERSION
case PAM_BAD_ITEM:
#endif
_end();
throw Exception(pam_handle, "pam_get_item()", last_result);
case PAM_PERM_DENIED: // The value of item was NULL
case PAM_SUCCESS:
break;
}
return data;
}
#ifdef __LIBPAM_VERSION
void Authenticator::fail_delay(const unsigned int micro_sec){
switch((last_result=pam_fail_delay(pam_handle, micro_sec))){
default:
_end();
throw Exception(pam_handle, "fail_delay()", last_result);
case PAM_SUCCESS:
break;
}
return;
}
#endif
void Authenticator::authenticate(void){
switch((last_result=pam_authenticate(pam_handle, 0))){
default:
case PAM_ABORT:
case PAM_AUTHINFO_UNAVAIL:
_end();
throw Exception(pam_handle, "pam_authenticate()", last_result);
case PAM_USER_UNKNOWN:
case PAM_MAXTRIES:
case PAM_CRED_INSUFFICIENT:
case PAM_AUTH_ERR:
throw Auth_Exception(pam_handle, "pam_authentication()", last_result);
case PAM_SUCCESS:
break;
}
switch((last_result=pam_acct_mgmt(pam_handle, PAM_SILENT))){
// The documentation and implementation of Linux PAM differs:
// PAM_NEW_AUTHTOKEN_REQD is described in the documentation but
// don't exists in the actual implementation. This issue needs
// to be fixes at some point.
default:
//case PAM_NEW_AUTHTOKEN_REQD:
case PAM_ACCT_EXPIRED:
case PAM_USER_UNKNOWN:
_end();
throw Exception(pam_handle, "pam_acct_mgmt()", last_result);
case PAM_AUTH_ERR:
case PAM_PERM_DENIED:
throw Auth_Exception(pam_handle, "pam_acct_mgmt()", last_result);
case PAM_SUCCESS:
break;
};
return;
}
void Authenticator::open_session(void){
switch((last_result=pam_setcred(pam_handle, PAM_ESTABLISH_CRED))){
default:
case PAM_CRED_ERR:
case PAM_CRED_UNAVAIL:
_end();
throw Exception(pam_handle, "pam_setcred()", last_result);
case PAM_CRED_EXPIRED:
case PAM_USER_UNKNOWN:
throw Cred_Exception(pam_handle, "pam_setcred()", last_result);
case PAM_SUCCESS:
break;
}
switch((last_result=pam_open_session(pam_handle, 0))){
// The documentation and implementation of Linux PAM differs:
// PAM_SESSION_ERROR is described in the documentation but
// don't exists in the actual implementation. This issue needs
// to be fixes at some point.
default:
//case PAM_SESSION_ERROR:
pam_setcred(pam_handle, PAM_DELETE_CRED);
_end();
throw Exception(pam_handle, "pam_open_session()", last_result);
case PAM_SUCCESS:
break;
};
return;
}
void Authenticator::close_session(void){
switch((last_result=pam_close_session(pam_handle, 0))){
// The documentation and implementation of Linux PAM differs:
// PAM_SESSION_ERROR is described in the documentation but
// don't exists in the actual implementation. This issue needs
// to be fixes at some point.
default:
//case PAM_SESSION_ERROR:
pam_setcred(pam_handle, PAM_DELETE_CRED);
_end();
throw Exception(pam_handle, "pam_close_session", last_result);
case PAM_SUCCESS:
break;
};
switch((last_result=pam_setcred(pam_handle, PAM_DELETE_CRED))){
default:
case PAM_CRED_ERR:
case PAM_CRED_UNAVAIL:
case PAM_CRED_EXPIRED:
case PAM_USER_UNKNOWN:
_end();
throw Exception(pam_handle, "pam_setcred()", last_result);
case PAM_SUCCESS:
break;
}
return;
}
void Authenticator::setenv(const std::string& key, const std::string& value){
std::string name_value = key+"="+value;
switch((last_result=pam_putenv(pam_handle, name_value.c_str()))){
default:
case PAM_PERM_DENIED:
case PAM_ABORT:
case PAM_BUF_ERR:
#ifdef __LIBPAM_VERSION
case PAM_BAD_ITEM:
#endif
_end();
throw Exception(pam_handle, "pam_putenv()", last_result);
case PAM_SUCCESS:
break;
};
return;
}
void Authenticator::delenv(const std::string& key){
switch((last_result=pam_putenv(pam_handle, key.c_str()))){
default:
case PAM_PERM_DENIED:
case PAM_ABORT:
case PAM_BUF_ERR:
#ifdef __LIBPAM_VERSION
case PAM_BAD_ITEM:
#endif
_end();
throw Exception(pam_handle, "pam_putenv()", last_result);
case PAM_SUCCESS:
break;
};
return;
}
const char* Authenticator::getenv(const std::string& key){
return pam_getenv(pam_handle, key.c_str());
}
char** Authenticator::getenvlist(void){
return pam_getenvlist(pam_handle);
}
};
std::ostream& operator<<( std::ostream& os, const PAM::Exception& e){
os << e.func_name << ": " << e.errstr;
return os;
}
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