yuuji@0: /* ========================================================================
yuuji@0:  * Copyright 1988-2006 University of Washington
yuuji@0:  *
yuuji@0:  * Licensed under the Apache License, Version 2.0 (the "License");
yuuji@0:  * you may not use this file except in compliance with the License.
yuuji@0:  * You may obtain a copy of the License at
yuuji@0:  *
yuuji@0:  *     http://www.apache.org/licenses/LICENSE-2.0
yuuji@0:  *
yuuji@0:  * 
yuuji@0:  * ========================================================================
yuuji@0:  */
yuuji@0: 
yuuji@0: /*
yuuji@0:  * Program:	Old SVR4 check password
yuuji@0:  *
yuuji@0:  * Author:	Mark Crispin
yuuji@0:  *		Networks and Distributed Computing
yuuji@0:  *		Computing & Communications
yuuji@0:  *		University of Washington
yuuji@0:  *		Administration Building, AG-44
yuuji@0:  *		Seattle, WA  98195
yuuji@0:  *		Internet: MRC@CAC.Washington.EDU
yuuji@0:  *
yuuji@0:  * Date:	1 August 1988
yuuji@0:  * Last Edited:	30 August 2006
yuuji@0:  */
yuuji@0: 
yuuji@0: /* Check password
yuuji@0:  * Accepts: login passwd struct
yuuji@0:  *	    password string
yuuji@0:  *	    argument count
yuuji@0:  *	    argument vector
yuuji@0:  * Returns: passwd struct if password validated, NIL otherwise
yuuji@0:  */
yuuji@0: 
yuuji@0: struct passwd *checkpw (struct passwd *pw,char *pass,int argc,char *argv[])
yuuji@0: {
yuuji@0:   char tmp[MAILTMPLEN];
yuuji@0:   struct spwd *sp = NIL;
yuuji@0:   time_t left;
yuuji@0:   time_t now = time (0);
yuuji@0:   struct tm *t = gmtime (&now);
yuuji@0:   int zone = t->tm_hour * 60 + t->tm_min;
yuuji@0:   int julian = t->tm_yday;
yuuji@0:   t = localtime (&now);		/* get local time now */
yuuji@0: 				/* minus UTC minutes since midnight */
yuuji@0:   zone = t->tm_hour * 60 + t->tm_min - zone;
yuuji@0:   /* julian can be one of:
yuuji@0:    *  36x  local time is December 31, UTC is January 1, offset -24 hours
yuuji@0:    *    1  local time is 1 day ahead of UTC, offset +24 hours
yuuji@0:    *    0  local time is same day as UTC, no offset
yuuji@0:    *   -1  local time is 1 day behind UTC, offset -24 hours
yuuji@0:    * -36x  local time is January 1, UTC is December 31, offset +24 hours
yuuji@0:    */
yuuji@0:   if (julian = t->tm_yday -julian)
yuuji@0:     zone += ((julian < 0) == (abs (julian) == 1)) ? -24*60 : 24*60;
yuuji@0: 				/* days since 1/1/1970 local time */
yuuji@0:   now = ((now /60) + zone) / (60*24);
yuuji@0: 				/* non-shadow authentication */
yuuji@0:   if (!pw->pw_passwd || !pw->pw_passwd[0] || !pw->pw_passwd[1] ||
yuuji@0:       strcmp (pw->pw_passwd,(char *) crypt (pass,pw->pw_passwd))) {
yuuji@0:     /* As far as I've been able to determine, here is how the expiration
yuuji@0:      * fields in the shadow authentication data work:
yuuji@0:      *  lstchg	last password change date if non-negative.  If zero, the
yuuji@0:      *		user can not log in without changing password.
yuuji@0:      *  max	number of days a password is valid if positive
yuuji@0:      * The expiration day is the *last* day that the password is valid.
yuuji@0:      */
yuuji@0: 				/* shadow authentication */
yuuji@0:     if ((sp = getspnam (pw->pw_name)) && sp->sp_lstchg &&
yuuji@0: 	((sp->sp_lstchg < 0) || (sp->sp_max <= 0) ||
yuuji@0: 	 ((sp->sp_lstchg + sp->sp_max) >= now)) &&
yuuji@0: 	sp->sp_pwdp && sp->sp_pwdp[0] && sp->sp_pwdp[1] &&
yuuji@0: 	!strcmp (sp->sp_pwdp,(char *) crypt (pass,sp->sp_pwdp))) {
yuuji@0:       if ((sp->sp_lstchg > 0) && (sp->sp_max > 0) &&
yuuji@0: 	  ((left = (sp->sp_lstchg + sp->sp_max) - now) <= 28)) {
yuuji@0: 	if (left) {
yuuji@0: 	  sprintf (tmp,"[ALERT] Password expires in %ld day(s)",(long) left);
yuuji@0: 	  mm_notify (NIL,tmp,NIL);
yuuji@0: 	}
yuuji@0: 	else mm_notify (NIL,"[ALERT] Password expires today!",WARN);
yuuji@0:       }
yuuji@0:       endspent ();		/* don't need shadow password data any more */
yuuji@0:     }
yuuji@0:     else pw = NIL;		/* password failed */
yuuji@0:   }
yuuji@0:   return pw;
yuuji@0: }