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passwd.c revision 1.3 
      1 /*
      2  * Copyright (c) 1988 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 char copyright[] =
     36 "@(#) Copyright (c) 1988 The Regents of the University of California.\n\
     37  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 static char sccsid[] = "@(#)passwd.c	5.5 (Berkeley) 7/6/91";
     42 #endif /* not lint */
     43 
     44 #include <stdio.h>
     45 #include <unistd.h>
     46 
     47 /*
     48  * Note on configuration:
     49  *      Generally one would not use both Kerberos and YP
     50  *      to maintain passwords.
     51  *
     52  */
     53 #ifdef KERBEROS
     54 int use_kerberos = 1;
     55 #else
     56 int use_kerberos = 0;
     57 #endif
     58 #ifdef YP
     59 int force_yp = 0;
     60 int use_yp;
     61 #else
     62 int use_yp = 0;
     63 #endif
     64 
     65 main(argc, argv)
     66 	int argc;
     67 	char **argv;
     68 {
     69 	extern int optind;
     70 	register int ch;
     71 	char *uname;
     72         int status;
     73 
     74 #ifdef	YP
     75         use_yp = _yp_check(NULL);
     76 #endif
     77 
     78 	while ((ch = getopt(argc, argv, "lky")) != EOF)
     79 		switch (ch) {
     80 		case 'l':		/* change local password file */
     81 			use_kerberos = 0;
     82 			use_yp = 0;
     83 			break;
     84 		case 'k':		/* change Kerberos password */
     85 #ifdef	KERBEROS
     86 			use_kerberos = 1;
     87 			use_yp = 0;
     88 			break;
     89 #else
     90                         usage();
     91                         exit(1);
     92 #endif
     93 		case 'y':		/* change YP password */
     94 #ifdef	YP
     95                         if (!use_yp) {
     96                                 fprintf(stderr, "passwd: YP not in use.\n");
     97                                 usage();
     98                                 exit(1);
     99                         }
    100 
    101                         /* XXX Maybe just exec yppasswd ?? */
    102 			use_kerberos = 0;
    103 			use_yp = 1;
    104                         force_yp = 1;
    105 			break;
    106 #else
    107                         usage();
    108                         exit(1);
    109 #endif
    110 		default:
    111 		case '?':
    112 			usage();
    113 			exit(1);
    114 		}
    115 
    116 	argc -= optind;
    117 	argv += optind;
    118 
    119 	uname = getlogin();
    120         if (uname == NULL) {
    121                 fprintf(stderr, "passwd: who are you ??\n");
    122                 exit(1);
    123         }
    124 
    125 	switch(argc) {
    126 	case 0:
    127 		break;
    128 	case 1:
    129 #ifdef	KERBEROS
    130 		if (use_kerberos && strcmp(argv[1], uname)) {
    131 			(void)fprintf(stderr, "passwd: %s\n\t%s\n%s\n",
    132 "to change another user's Kerberos password, do",
    133 "\"kinit user; passwd; kdestroy\";",
    134 "to change a user's local passwd, use \"passwd -l user\"");
    135 			exit(1);
    136 		}
    137 #endif
    138 		uname = argv[0];
    139 		break;
    140 	default:
    141 		usage();
    142 		exit(1);
    143 	}
    144 
    145 #ifdef	KERBEROS
    146 	if (use_kerberos)
    147 		exit(krb_passwd());
    148 #endif
    149 #ifdef	YP
    150         if (force_yp || ((status = local_passwd(uname)) && use_yp))
    151 		exit(yp_passwd(uname));
    152         exit(status);
    153 #endif
    154 	exit(local_passwd(uname));
    155 }
    156 
    157 usage()
    158 {
    159 #if	defined(KERBEROS) && defined(YP)
    160 	(void)fprintf(stderr, "usage: passwd [-l] [-k] [-y] user\n");
    161 #else	/* !(KERBEROS && YP) */
    162 #if	defined(KERBEROS) || defined(YP)
    163 	(void)fprintf(stderr, "usage: passwd [-l] user\n");
    164 #else
    165 	(void)fprintf(stderr, "usage: passwd user\n");
    166 #endif
    167 #endif	/* KERBEROS && YP */
    168 }
    169