406 lines
10 KiB
C
406 lines
10 KiB
C
/* $NetBSD: passwd.c,v 1.30 2009/04/17 20:25:08 dyoung 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[] = "from: @(#)passwd.c 8.3 (Berkeley) 4/2/94";
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#else
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__RCSID("$NetBSD: passwd.c,v 1.30 2009/04/17 20:25:08 dyoung Exp $");
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#endif
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#endif /* not lint */
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#include <assert.h>
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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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#ifdef USE_PAM
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static void global_usage(const char *);
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static const struct pw_module_s {
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const char *argv0;
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const char *dbname;
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char compat_opt;
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void (*pw_usage)(const char *);
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void (*pw_process)(const char *, int, char **);
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} pw_modules[] = {
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/* "files" -- local password database */
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{ NULL, "files", 'l', pwlocal_usage, pwlocal_process },
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#ifdef YP
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/* "nis" -- YP/NIS password database */
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{ NULL, "nis", 'y', pwyp_usage, pwyp_process },
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{ "yppasswd", NULL, 0, pwyp_argv0_usage, pwyp_process },
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#endif
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#ifdef KERBEROS5
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/* "krb5" -- Kerberos 5 password database */
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{ NULL, "krb5", 'k', pwkrb5_usage, pwkrb5_process },
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{ "kpasswd", NULL, 0, pwkrb5_argv0_usage, pwkrb5_process },
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#endif
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/* default -- use whatever PAM decides */
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{ NULL, NULL, 0, NULL, pwpam_process },
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{ NULL, NULL, 0, NULL, NULL }
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};
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static const struct pw_module_s *personality;
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static void
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global_usage(const char *prefix)
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{
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const struct pw_module_s *pwm;
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(void) fprintf(stderr, "%s %s [user]\n", prefix, getprogname());
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for (pwm = pw_modules; pwm->pw_process != NULL; pwm++) {
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if (pwm->argv0 == NULL && pwm->pw_usage != NULL)
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(*pwm->pw_usage)(" ");
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}
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}
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void
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usage(void)
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{
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if (personality != NULL && personality->pw_usage != NULL)
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(*personality->pw_usage)("usage:");
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else
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global_usage("usage:");
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exit(1);
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}
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int
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main(int argc, char **argv)
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{
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const struct pw_module_s *pwm;
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const char *username;
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int ch, i;
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char opts[16];
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/* Build opts string from module compat_opts */
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i = 0;
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opts[i++] = 'd';
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opts[i++] = ':';
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for (pwm = pw_modules; pwm->pw_process != NULL; pwm++) {
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if (pwm->compat_opt != 0)
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opts[i++] = pwm->compat_opt;
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}
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opts[i++] = '\0';
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/* First, look for personality based on argv[0]. */
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for (pwm = pw_modules; pwm->pw_process != NULL; pwm++) {
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if (pwm->argv0 != NULL &&
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strcmp(pwm->argv0, getprogname()) == 0)
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goto got_personality;
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}
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/* Try based on compat_opt or -d. */
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for (ch = 0, pwm = pw_modules; pwm->pw_process != NULL; pwm++) {
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if (pwm->argv0 == NULL && pwm->dbname == NULL &&
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pwm->compat_opt == 0) {
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/*
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* We have reached the default personality case.
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* Make sure the user didn't provide a bogus
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* personality name.
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*/
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if (ch == 'd')
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usage();
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break;
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}
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ch = getopt(argc, argv, opts);
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if (ch == '?')
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usage();
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if (ch == 'd' && pwm->dbname != NULL &&
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strcmp(pwm->dbname, optarg) == 0) {
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/*
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* "passwd -d dbname" matches; this is our
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* chosen personality.
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*/
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break;
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}
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if (pwm->compat_opt != 0 && ch == pwm->compat_opt) {
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/*
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* Legacy "passwd -l" or similar matches; this
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* is our chosen personality.
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*/
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break;
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}
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/* Reset getopt() and go around again. */
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optind = 1;
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optreset = 1;
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}
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got_personality:
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personality = pwm;
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/*
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* At this point, optind should be either 1 ("passwd"),
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* 2 ("passwd -l"), or 3 ("passwd -d files"). Consume
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* these arguments and reset getopt() for the modules to use.
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*/
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assert(optind >= 1 && optind <= 3);
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argc -= optind;
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argv += optind;
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optind = 0;
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optreset = 1;
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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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(*personality->pw_process)(username, argc, argv);
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return 0;
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}
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#else /* ! USE_PAM */
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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 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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static void
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usage(void)
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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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int
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main(int argc, 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, *oopt;
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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 |=
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(*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 ((oopt = 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 ((oopt[1] == ':' && curopt[1] != ':') ||
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(oopt[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 ((oopt = strchr(pw_modules[i].args, ch)) != NULL) {
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j = (oopt[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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#endif /* USE_PAM */
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