275 lines
7.8 KiB
C
275 lines
7.8 KiB
C
/* $NetBSD: passwd.c,v 1.21 2001/02/19 23:03:50 cgd 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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\n\
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The Regents of the University of California. All rights reserved.\n");
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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[] = "from: @(#)passwd.c 8.3 (Berkeley) 4/2/94";
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#else
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__RCSID("$NetBSD: passwd.c,v 1.21 2001/02/19 23:03:50 cgd Exp $");
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#endif
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#endif /* not lint */
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#include <err.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 <pwd.h>
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#include "extern.h"
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static struct pw_module_s {
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const char *argv0;
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const char *args;
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const char *usage;
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int (*pw_init) __P((const char *));
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int (*pw_arg) __P((char, const char *));
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int (*pw_arg_end) __P((void));
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void (*pw_end) __P((void));
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int (*pw_chpw) __P((const char*));
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int invalid;
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#define INIT_INVALID 1
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#define ARG_INVALID 2
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int use_class;
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} pw_modules[] = {
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#ifdef KERBEROS5
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{ NULL, "5ku:", "[-5] [-k] [-u principal]",
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krb5_init, krb5_arg, krb5_arg_end, krb5_end, krb5_chpw, 0, 0 },
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{ "kpasswd", "5ku:", "[-5] [-k] [-u principal]",
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krb5_init, krb5_arg, krb5_arg_end, krb5_end, krb5_chpw, 0, 0 },
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#endif
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#ifdef KERBEROS
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{ NULL, "4ku:i:r:", "[-4] [-k] [-u user] [-i instance] [-r realm]",
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krb4_init, krb4_arg, krb4_arg_end, krb4_end, krb4_chpw, 0, 0 },
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{ "kpasswd", "4ku:i:r:", "[-4] [-k] [-u user] [-i instance] [-r realm]",
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krb4_init, krb4_arg, krb4_arg_end, krb4_end, krb4_chpw, 0, 0 },
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#endif
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#ifdef YP
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{ NULL, "y", "[-y]",
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yp_init, yp_arg, yp_arg_end, yp_end, yp_chpw, 0, 0 },
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{ "yppasswd", "", "[-y]",
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yp_init, yp_arg, yp_arg_end, yp_end, yp_chpw, 0, 0 },
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#endif
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/* local */
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{ NULL, "l", "[-l]",
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local_init, local_arg, local_arg_end, local_end, local_chpw, 0, 0 },
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/* terminator */
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
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};
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void usage __P((void));
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int main __P((int, char **));
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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int ch;
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char *username;
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char optstring[64]; /* if we ever get more than 64 args, shoot me. */
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const char *curopt, *optopt;
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int i, j;
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int valid;
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int use_always;
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/* allow passwd modules to do argv[0] specific processing */
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use_always = 0;
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valid = 0;
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for (i = 0; pw_modules[i].pw_init != NULL; i++) {
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pw_modules[i].invalid = 0;
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if (pw_modules[i].argv0) {
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/*
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* If we have a module that matches this progname, be
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* sure that no modules but those that match this
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* progname can be used. If we have a module that
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* matches against a particular progname, but does NOT
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* match this one, don't use that module.
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*/
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if ((strcmp(getprogname(), pw_modules[i].argv0) == 0) &&
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use_always == 0) {
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for (j = 0; j < i; j++) {
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pw_modules[j].invalid |= INIT_INVALID;
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(*pw_modules[j].pw_end)();
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}
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use_always = 1;
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} else if (use_always == 0)
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pw_modules[i].invalid |= INIT_INVALID;
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} else if (use_always)
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pw_modules[i].invalid |= INIT_INVALID;
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if (pw_modules[i].invalid)
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continue;
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pw_modules[i].invalid |= (*pw_modules[i].pw_init)(getprogname()) ?
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/* zero on success, non-zero on error */
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INIT_INVALID : 0;
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if (! pw_modules[i].invalid)
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valid = 1;
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}
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if (valid == 0)
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errx(1, "Can't change password.");
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/* Build the option string from the individual modules' option
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* strings. Note that two modules can share a single option
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* letter. */
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optstring[0] = '\0';
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j = 0;
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for (i = 0; pw_modules[i].pw_init != NULL; i++) {
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if (pw_modules[i].invalid)
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continue;
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curopt = pw_modules[i].args;
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while (*curopt != '\0') {
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if ((optopt = strchr(optstring, *curopt)) == NULL) {
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optstring[j++] = *curopt;
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if (curopt[1] == ':') {
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curopt++;
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optstring[j++] = *curopt;
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}
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optstring[j] = '\0';
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} else if ((optopt[1] == ':' && curopt[1] != ':') ||
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(optopt[1] != ':' && curopt[1] == ':')) {
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errx(1, "NetBSD ERROR! Different password "
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"modules have two different ideas about "
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"%c argument format.", curopt[0]);
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}
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curopt++;
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}
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}
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while ((ch = getopt(argc, argv, optstring)) != -1)
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{
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valid = 0;
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for (i = 0; pw_modules[i].pw_init != NULL; i++) {
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if (pw_modules[i].invalid)
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continue;
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if ((optopt = strchr(pw_modules[i].args, ch)) != NULL) {
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j = (optopt[1] == ':') ?
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! (*pw_modules[i].pw_arg)(ch, optarg) :
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! (*pw_modules[i].pw_arg)(ch, NULL);
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if (j != 0)
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pw_modules[i].invalid |= ARG_INVALID;
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if (pw_modules[i].invalid)
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(*pw_modules[i].pw_end)();
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} else {
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/* arg doesn't match this module */
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pw_modules[i].invalid |= ARG_INVALID;
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(*pw_modules[i].pw_end)();
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}
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if (! pw_modules[i].invalid)
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valid = 1;
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}
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if (! valid) {
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usage();
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exit(1);
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}
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}
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/* select which module to use to actually change the password. */
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use_always = 0;
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valid = 0;
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for (i = 0; pw_modules[i].pw_init != NULL; i++)
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if (! pw_modules[i].invalid) {
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pw_modules[i].use_class = (*pw_modules[i].pw_arg_end)();
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if (pw_modules[i].use_class != PW_DONT_USE)
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valid = 1;
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if (pw_modules[i].use_class == PW_USE_FORCE)
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use_always = 1;
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}
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if (! valid)
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/* hang the DJ */
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errx(1, "No valid password module specified.");
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argc -= optind;
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argv += optind;
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username = getlogin();
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if (username == NULL)
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errx(1, "who are you ??");
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switch(argc) {
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case 0:
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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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exit(1);
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}
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/* allow for fallback to other chpw() methods. */
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for (i = 0; pw_modules[i].pw_init != NULL; i++) {
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if (pw_modules[i].invalid)
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continue;
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if ((use_always && pw_modules[i].use_class == PW_USE_FORCE) ||
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(!use_always && pw_modules[i].use_class == PW_USE)) {
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valid = (*pw_modules[i].pw_chpw)(username);
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(*pw_modules[i].pw_end)();
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if (valid >= 0)
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exit(valid);
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/* return value < 0 indicates continuation. */
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}
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}
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exit(1);
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}
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void
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usage()
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{
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int i;
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fprintf(stderr, "usage:\n");
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for (i = 0; pw_modules[i].pw_init != NULL; i++)
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if (! (pw_modules[i].invalid & INIT_INVALID))
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fprintf(stderr, "\t%s %s [user]\n", getprogname(),
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pw_modules[i].usage);
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exit(1);
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}
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