static void
update_lastlog (const char *fname, const char *pty, const char *host)
{
# if defined(HAVE_STRUCT_LASTLOGX) && defined(HAVE_UPDLASTLOGX)
struct lastlogx llx;
# endif
# ifdef HAVE_STRUCT_LASTLOG
int fd;
struct lastlog ll;
char lastlogfile[256];
struct passwd *pwent;
struct stat st;
# endif
# if defined(HAVE_STRUCT_LASTLOGX) && defined(HAVE_UPDLASTLOGX)
memset (&llx, 0, sizeof (llx));
llx.ll_tv.tv_sec = time (NULL);
llx.ll_tv.tv_usec = 0;
strncpy (llx.ll_line, pty, sizeof (llx.ll_line));
strncpy (llx.ll_host, host, sizeof (llx.ll_host));
updlastlogx (LASTLOGX_FILE, getuid (), &llx);
# endif
# ifdef HAVE_STRUCT_LASTLOG
pwent = getpwuid (getuid ());
if (!pwent)
{
ptytty_warn ("no entry in password file, not updating lastlog.\n", 0);
return;
}
memset (&ll, 0, sizeof (ll));
ll.ll_time = time (NULL);
strncpy (ll.ll_line, pty, sizeof (ll.ll_line));
strncpy (ll.ll_host, host, sizeof (ll.ll_host));
if (stat (fname, &st) != 0)
return;
if (S_ISDIR (st.st_mode))
{
snprintf (lastlogfile, sizeof (lastlogfile), "%s/%s", fname,
(!pwent->pw_name || pwent->pw_name[0] == '\0') ? "unknown"
: pwent->pw_name);
if ((fd = open (lastlogfile, O_WRONLY | O_CREAT, 0644)) >= 0)
{
write (fd, &ll, sizeof (ll));
close (fd);
}
}
else if (S_ISREG (st.st_mode))
if ((fd = open (fname, O_RDWR)) != -1)
{
if (lseek (fd, (off_t) ((long)pwent->pw_uid * sizeof (ll)),
SEEK_SET) != -1)
write (fd, &ll, sizeof (ll));
close (fd);
}
# endif /* HAVE_STRUCT_LASTLOG */
}
void
ptytty::init ()
{
sanitise_stdfd ();
uid_t uid = getuid ();
gid_t gid = getgid ();
// before doing anything else, check for setuid/setgid operation,
// start the helper process and drop privileges
if (uid != geteuid ()
|| gid != getegid ())
{
#if PTYTTY_HELPER
use_helper ();
#else
ptytty_warn ("running setuid/setgid without pty helper compiled in, continuing unprivileged.\n", 0);
#endif
drop_privileges ();
}
}
/*
* make and write utmp and wtmp entries
*/
void
ptytty_unix::login (int cmd_pid, bool login_shell, const char *hostname)
{
const char *pty = name;
if (!pty || !*pty)
return;
this->cmd_pid = cmd_pid;
this->login_shell = login_shell;
#ifdef HAVE_STRUCT_UTMP
struct utmp *ut = &this->ut;
#endif
#ifdef HAVE_STRUCT_UTMPX
struct utmpx *utx = &this->utx;
#endif
int i;
struct passwd *pwent = getpwuid (getuid ());
const char *name = (pwent && pwent->pw_name) ? pwent->pw_name : "?";
if (!strncmp (pty, "/dev/", 5))
pty += 5; /* skip /dev/ prefix */
#if defined(HAVE_UTMP_PID) || defined(HAVE_STRUCT_UTMPX)
if (!strncmp (pty, "pty", 3) || !strncmp (pty, "tty", 3))
strncpy (ut_id, pty + 3, sizeof (ut_id));
else if (sscanf (pty, "pts/%d", &i) == 1)
sprintf (ut_id, "vt%02x", (i & 0xff)); /* sysv naming */
else
{
ptytty_warn ("can't parse tty name \"%s\", not adding utmp entry.\n", pty);
return;
}
#endif
#ifdef HAVE_STRUCT_UTMP
memset (ut, 0, sizeof (struct utmp));
# ifdef HAVE_UTMP_PID
setutent ();
strncpy (ut->ut_id, ut_id, sizeof (ut->ut_id));
ut->ut_type = DEAD_PROCESS;
getutid (ut); /* position to entry in utmp file */
# endif
#endif
#ifdef HAVE_STRUCT_UTMPX
memset (utx, 0, sizeof (struct utmpx));
setutxent ();
strncpy (utx->ut_id, ut_id, sizeof (utx->ut_id));
utx->ut_type = DEAD_PROCESS;
getutxid (utx); /* position to entry in utmp file */
#endif
#ifdef HAVE_STRUCT_UTMP
strncpy (ut->ut_line, pty, sizeof (ut->ut_line));
# ifdef HAVE_UTMP_HOST
strncpy (ut->ut_host, hostname, sizeof (ut->ut_host));
# endif
ut->ut_time = time (NULL);
# ifdef HAVE_UTMP_PID
strncpy (ut->ut_user, name, sizeof (ut->ut_user));
strncpy (ut->ut_id, ut_id, sizeof (ut->ut_id));
ut->ut_pid = cmd_pid;
ut->ut_type = USER_PROCESS;
pututline (ut);
endutent (); /* close the file */
utmp_pos = 0;
# else
strncpy (ut->ut_name, name, sizeof (ut->ut_name));
# endif
#endif
#ifdef HAVE_STRUCT_UTMPX
strncpy (utx->ut_line, pty, sizeof (utx->ut_line));
strncpy (utx->ut_user, name, sizeof (utx->ut_user));
strncpy (utx->ut_id, ut_id, sizeof (utx->ut_id));
# if HAVE_UTMPX_SESSION
utx->ut_session = getsid (0);
# endif
utx->ut_tv.tv_sec = time (NULL);
utx->ut_tv.tv_usec = 0;
utx->ut_pid = cmd_pid;
# ifdef HAVE_UTMPX_HOST
strncpy (utx->ut_host, hostname, sizeof (utx->ut_host));
# if 0
{
char *colon;
if ((colon = strrchr (ut->ut_host, ':')) != NULL)
*colon = '\0';
}
# endif
# endif
utx->ut_type = USER_PROCESS;
pututxline (utx);
endutxent (); /* close the file */
utmp_pos = 0;
#endif
#if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID)
{
# if 1
int fdstdin = dup (STDIN_FILENO);
dup2 (tty, STDIN_FILENO);
i = ttyslot ();
if (write_bsd_utmp (i, ut))
utmp_pos = i;
dup2 (fdstdin, STDIN_FILENO);
close (fdstdin);
# endif
}
#endif
#ifdef WTMP_SUPPORT
#ifdef LOG_ONLY_ON_LOGIN
if (login_shell)
#endif
{
# ifdef HAVE_STRUCT_UTMP
# ifdef HAVE_UPDWTMP
updwtmp (WTMP_FILE, ut);
# else
update_wtmp (WTMP_FILE, ut);
# endif
# endif
# if defined(HAVE_STRUCT_UTMPX) && defined(HAVE_UPDWTMPX)
updwtmpx (WTMPX_FILE, utx);
# endif
}
#endif
#if defined(LASTLOG_SUPPORT) && defined(LASTLOG_FILE)
#ifdef LOG_ONLY_ON_LOGIN
if (login_shell)
#endif
update_lastlog (LASTLOG_FILE, pty, hostname);
#endif
}
