317 lines
7.0 KiB
C
317 lines
7.0 KiB
C
/* $NetBSD: chpass.c,v 1.33 2008/07/21 14:19:21 lukem Exp $ */
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/*-
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* Copyright (c) 1988, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)chpass.c 8.4 (Berkeley) 4/2/94";
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#else
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__RCSID("$NetBSD: chpass.c,v 1.33 2008/07/21 14:19:21 lukem Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <util.h>
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#include <libgen.h>
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#include "chpass.h"
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#include "pathnames.h"
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static char tempname[] = "/tmp/pw.XXXXXX";
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uid_t uid;
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int use_yp;
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void (*Pw_error)(const char *, int, int);
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#ifdef YP
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extern int _yp_check(char **); /* buried deep inside libc */
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#endif
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void baduser(void);
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void cleanup(void);
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void usage(void);
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int
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main(int argc, char **argv)
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{
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enum { NEWSH, LOADENTRY, EDITENTRY } op;
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struct passwd *pw, lpw, old_pw;
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int ch, dfd, pfd, tfd;
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#ifdef YP
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int yflag = 0;
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#endif
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char *arg, *username = NULL;
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#ifdef __GNUC__
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pw = NULL; /* XXX gcc -Wuninitialized */
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arg = NULL;
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#endif
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#ifdef YP
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use_yp = _yp_check(NULL);
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#endif
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op = EDITENTRY;
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while ((ch = getopt(argc, argv, "a:s:ly")) != -1)
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switch (ch) {
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case 'a':
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op = LOADENTRY;
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arg = optarg;
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break;
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case 's':
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op = NEWSH;
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arg = optarg;
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break;
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case 'l':
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use_yp = 0;
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break;
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case 'y':
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#ifdef YP
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if (!use_yp)
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errx(1, "YP not in use.");
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yflag = 1;
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#else
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errx(1, "YP support not compiled in.");
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#endif
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break;
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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uid = getuid();
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switch (argc) {
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case 0:
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/* nothing */
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break;
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case 1:
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username = argv[0];
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break;
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default:
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usage();
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}
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#ifdef YP
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/*
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* We need to determine if we _really_ want to use YP.
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* If we defaulted to YP (i.e. were not given the -y flag),
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* and the master is not running rpc.yppasswdd, we check
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* to see if the user exists in the local passwd database.
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* If so, we use it, otherwise we error out.
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*/
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if (use_yp && yflag == 0) {
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if (check_yppasswdd()) {
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/*
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* We weren't able to contact rpc.yppasswdd.
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* Check to see if we're in the local
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* password database. If we are, use it.
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*/
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if (username != NULL)
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pw = getpwnam(username);
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else
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pw = getpwuid(uid);
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if (pw != NULL)
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use_yp = 0;
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else {
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warnx("master YP server not running yppasswd"
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" daemon.");
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errx(1, "Can't change password.");
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}
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}
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}
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#endif
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#ifdef YP
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if (use_yp)
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Pw_error = yppw_error;
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else
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#endif
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Pw_error = pw_error;
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#ifdef YP
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if (op == LOADENTRY && use_yp)
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errx(1, "cannot load entry using YP.\n"
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"\tUse the -l flag to load local.");
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#endif
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if (op == EDITENTRY || op == NEWSH) {
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if (username != NULL) {
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pw = getpwnam(username);
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if (pw == NULL)
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errx(1, "unknown user: %s", username);
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if (uid && uid != pw->pw_uid)
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baduser();
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} else {
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pw = getpwuid(uid);
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if (pw == NULL)
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errx(1, "unknown user: uid %u", uid);
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}
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/* Make a copy for later verification */
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old_pw = *pw;
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old_pw.pw_gecos = strdup(old_pw.pw_gecos);
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if (!old_pw.pw_gecos) {
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err(1, "strdup");
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/*NOTREACHED*/
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}
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}
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if (op == NEWSH) {
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/* protect p_shell -- it thinks NULL is /bin/sh */
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if (!arg[0])
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usage();
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if (p_shell(arg, pw, NULL))
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(*Pw_error)(NULL, 0, 1);
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}
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if (op == LOADENTRY) {
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if (uid)
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baduser();
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pw = &lpw;
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if (!pw_scan(arg, pw, NULL))
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exit(1);
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}
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/* Edit the user passwd information if requested. */
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if (op == EDITENTRY) {
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struct stat sb;
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dfd = mkstemp(tempname);
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if (dfd < 0 || fcntl(dfd, F_SETFD, 1) < 0)
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(*Pw_error)(tempname, 1, 1);
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if (atexit(cleanup)) {
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cleanup();
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errx(1, "couldn't register cleanup");
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}
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if (stat(dirname(tempname), &sb) == -1)
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err(1, "couldn't stat `%s'", dirname(tempname));
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if (!(sb.st_mode & S_ISTXT))
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errx(1, "temporary directory `%s' is not sticky",
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dirname(tempname));
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display(tempname, dfd, pw);
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edit(tempname, pw);
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}
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#ifdef YP
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if (use_yp) {
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if (pw_yp(pw, uid))
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yppw_error((char *)NULL, 0, 1);
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else
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exit(0);
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/* Will not exit from this if. */
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}
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#endif /* YP */
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/*
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* Get the passwd lock file and open the passwd file for
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* reading.
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*/
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pw_init();
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tfd = pw_lock(0);
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if (tfd < 0) {
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if (errno != EEXIST)
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err(1, "%s", _PATH_MASTERPASSWD_LOCK);
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warnx("The passwd file is busy, waiting...");
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tfd = pw_lock(10);
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if (tfd < 0) {
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if (errno != EEXIST)
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err(1, "%s", _PATH_MASTERPASSWD_LOCK);
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errx(1, "The passwd file is still busy, "
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"try again later.");
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}
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}
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if (fcntl(tfd, F_SETFD, 1) < 0)
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pw_error(_PATH_MASTERPASSWD_LOCK, 1, 1);
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pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
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if (pfd < 0 || fcntl(pfd, F_SETFD, 1) < 0)
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pw_error(_PATH_MASTERPASSWD, 1, 1);
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/* Copy the passwd file to the lock file, updating pw. */
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pw_copy(pfd, tfd, pw, (op == LOADENTRY) ? NULL : &old_pw);
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close(pfd);
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close(tfd);
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/* Now finish the passwd file update. */
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if (pw_mkdb(username, 0) < 0)
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pw_error(NULL, 0, 1);
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exit(0);
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}
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void
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baduser(void)
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{
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errx(1, "%s", strerror(EACCES));
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}
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void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: %s [-a list] [-s shell] [-l] [user]\n"
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" %s [-a list] [-s shell] [-y] [user]\n",
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getprogname(), getprogname());
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exit(1);
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}
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void
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cleanup(void)
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{
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(void)unlink(tempname);
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}
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