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#include <pwd.h>
#include <grp.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#ifdef USEPAM
extern "C" {
#include <security/pam_appl.h>
}
#else
#include <crypt.h>
#include <shadow.h>
#endif
#include "loginapplication.h"
LoginApplication *lApp;
LoginApplication::LoginApplication ( int &argc, char **argv )
: QPEApplication ( argc, argv, GuiServer )
{
lApp = this;
}
const char *LoginApplication::s_username = 0;
#ifdef USEPAM
const char *LoginApplication::s_pam_password = 0;
int LoginApplication::pam_helper ( int num_msg, const struct pam_message **msg, struct pam_response **resp, void * )
{
int replies = 0;
struct pam_response *reply = 0;
int size = sizeof( struct pam_response );
for ( int i = 0; i < num_msg; i++ ) {
switch ( msg [i]-> msg_style ) {
case PAM_PROMPT_ECHO_ON: // user name given to PAM already
return PAM_CONV_ERR;
case PAM_PROMPT_ECHO_OFF: // wants password
reply = (struct pam_response *) ::realloc ( reply, size );
if ( !reply )
return PAM_CONV_ERR;
size += sizeof( struct pam_response );
reply [replies]. resp_retcode = PAM_SUCCESS;
reply [replies]. resp = ::strdup ( s_pam_password );
replies++; // PAM frees resp
break;
case PAM_TEXT_INFO:
break;
default:
/* unknown or PAM_ERROR_MSG */
if ( reply )
::free ( reply );
return PAM_CONV_ERR;
}
}
if ( reply )
*resp = reply;
return PAM_SUCCESS;
}
bool LoginApplication::checkPassword ( const char *user, const char *pass )
{
static struct pam_conv conv = { &LoginApplication::pam_helper, 0 };
int pam_error;
pam_handle_t *pamh = 0;
pam_error = ::pam_start( "xdm", user, &conv, &pamh );
if ( pam_error == PAM_SUCCESS ) {
s_pam_password = pass;
pam_error = ::pam_authenticate ( pamh, 0 );
s_pam_password = 0;
}
::pam_end ( pamh, pam_error );
return ( pam_error == PAM_SUCCESS );
}
#else
bool LoginApplication::checkPassword ( const char *user, const char *pass )
{
char *encrypted, *correct;
struct passwd *pw;
if ( !user || !pass )
return false;
pw = ::getpwnam ( user );
if ( !pw )
return false;
if (( ::strcmp ( pw-> pw_passwd, "x" ) == 0 ) || ( ::strcmp ( pw-> pw_passwd, "*" ) == 0 )) {
struct spwd *sp = ::getspnam ( pw-> pw_name );
if ( !sp )
return false;
correct = sp-> sp_pwdp;
}
else
correct = pw-> pw_passwd;
if ( correct == 0 || correct[0] == '\0' )
return true;
encrypted = ::crypt ( pass, correct );
return ( ::strcmp ( encrypted, correct ) == 0 );
}
#endif
bool LoginApplication::changeIdentity ( )
{
const char *DEFAULT_LOGIN_PATH = "/bin:/usr/bin";
const char *DEFAULT_ROOT_LOGIN_PATH = "/usr/sbin:/bin:/usr/bin:/sbin";
if ( !s_username )
return false;
struct passwd *pw = ::getpwnam ( s_username );
if ( !pw )
return false;
bool fail = false;
fail |= ( ::initgroups ( pw-> pw_name, pw-> pw_gid ));
::endgrent ( );
fail |= ( ::setgid ( pw-> pw_gid ));
fail |= ( ::setuid ( pw-> pw_uid ));
fail |= ( ::chdir ( pw-> pw_dir ) && ::chdir ( "/" ));
fail |= ( ::setenv ( "HOME", pw-> pw_dir, 1 ));
fail |= ( ::setenv ( "SHELL", pw-> pw_shell, 1 ));
fail |= ( ::setenv ( "USER", pw-> pw_name, 1 ));
fail |= ( ::setenv ( "LOGNAME", pw-> pw_name, 1 ));
fail |= ( ::setenv ( "PATH", ( pw-> pw_uid ? DEFAULT_LOGIN_PATH : DEFAULT_ROOT_LOGIN_PATH ), 1 ));
return !fail;
}
bool LoginApplication::login ( )
{
char *opie = ::getenv ( "OPIEDIR" );
char *arg = new char [::strlen ( opie ) + 8 + 1];
::strcpy ( arg, opie );
::strcat ( arg, "/bin/qpe" );
// start qpe via a login shell
::execl ( "/bin/sh", "-sh", "-c", arg, 0 );
return false;
}
const char *LoginApplication::loginAs ( )
{
return s_username;
}
void LoginApplication::setLoginAs ( const char *name )
{
s_username = name;
}
QStringList LoginApplication::allUsers ( )
{
struct passwd *pwd;
QStringList sl;
while (( pwd = ::getpwent ( ))) {
if (( pwd-> pw_uid == 0 ) || ( pwd-> pw_uid >= 500 && pwd-> pw_uid < 65534 ))
sl << QString ( pwd-> pw_name );
}
::endpwent ( );
return sl;
}
void LoginApplication::quitToConsole ( )
{
QPEApplication::quit ( );
::kill ( ::getppid ( ), SIGTERM );
}
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