NetBSD-5.0.2/usr.bin/passwd/passwd.c
/* $NetBSD: passwd.c,v 1.28 2008/07/21 14:19:24 lukem Exp $ */
/*
* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "from: @(#)passwd.c 8.3 (Berkeley) 4/2/94";
#else
__RCSID("$NetBSD: passwd.c,v 1.28 2008/07/21 14:19:24 lukem Exp $");
#endif
#endif /* not lint */
#include <assert.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include "extern.h"
#ifdef USE_PAM
static void global_usage(const char *);
static const struct pw_module_s {
const char *argv0;
const char *dbname;
char compat_opt;
void (*pw_usage)(const char *);
void (*pw_process)(const char *, int, char **);
} pw_modules[] = {
/* "files" -- local password database */
{ NULL, "files", 'l', pwlocal_usage, pwlocal_process },
#ifdef YP
/* "nis" -- YP/NIS password database */
{ NULL, "nis", 'y', pwyp_usage, pwyp_process },
{ "yppasswd", NULL, 0, pwyp_argv0_usage, pwyp_process },
#endif
#ifdef KERBEROS5
/* "krb5" -- Kerberos 5 password database */
{ NULL, "krb5", 'k', pwkrb5_usage, pwkrb5_process },
{ "kpasswd", NULL, 0, pwkrb5_argv0_usage, pwkrb5_process },
#endif
/* default -- use whatever PAM decides */
{ NULL, NULL, 0, NULL, pwpam_process },
{ 0 }
};
static const struct pw_module_s *personality;
static void
global_usage(const char *prefix)
{
const struct pw_module_s *pwm;
(void) fprintf(stderr, "%s %s [user]\n", prefix, getprogname());
for (pwm = pw_modules; pwm->pw_process != NULL; pwm++) {
if (pwm->argv0 == NULL && pwm->pw_usage != NULL)
(*pwm->pw_usage)(" ");
}
}
void
usage(void)
{
if (personality != NULL && personality->pw_usage != NULL)
(*personality->pw_usage)("usage:");
else
global_usage("usage:");
exit(1);
}
int
main(int argc, char **argv)
{
const struct pw_module_s *pwm;
const char *username;
int ch, i;
char opts[16];
/* Build opts string from module compat_opts */
i = 0;
opts[i++] = 'd';
opts[i++] = ':';
for (pwm = pw_modules; pwm->pw_process != NULL; pwm++) {
if (pwm->compat_opt != 0)
opts[i++] = pwm->compat_opt;
}
opts[i++] = '\0';
/* First, look for personality based on argv[0]. */
for (pwm = pw_modules; pwm->pw_process != NULL; pwm++) {
if (pwm->argv0 != NULL &&
strcmp(pwm->argv0, getprogname()) == 0)
goto got_personality;
}
/* Try based on compat_opt or -d. */
for (ch = 0, pwm = pw_modules; pwm->pw_process != NULL; pwm++) {
if (pwm->argv0 == NULL && pwm->dbname == NULL &&
pwm->compat_opt == 0) {
/*
* We have reached the default personality case.
* Make sure the user didn't provide a bogus
* personality name.
*/
if (ch == 'd')
usage();
break;
}
ch = getopt(argc, argv, opts);
if (ch == '?')
usage();
if (ch == 'd' && pwm->dbname != NULL &&
strcmp(pwm->dbname, optarg) == 0) {
/*
* "passwd -d dbname" matches; this is our
* chosen personality.
*/
break;
}
if (pwm->compat_opt != 0 && ch == pwm->compat_opt) {
/*
* Legacy "passwd -l" or similar matches; this
* is our chosen personality.
*/
break;
}
/* Reset getopt() and go around again. */
optind = 1;
optreset = 1;
}
got_personality:
personality = pwm;
/*
* At this point, optind should be either 1 ("passwd"),
* 2 ("passwd -l"), or 3 ("passwd -d files"). Consume
* these arguments and reset getopt() for the modules to use.
*/
assert(optind >= 1 && optind <= 3);
argc -= optind;
argv += optind;
optind = 0;
optreset = 1;
username = getlogin();
if (username == NULL)
errx(1, "who are you ??");
(*personality->pw_process)(username, argc, argv);
return 0;
}
#else /* ! USE_PAM */
static struct pw_module_s {
const char *argv0;
const char *args;
const char *usage;
int (*pw_init) __P((const char *));
int (*pw_arg) __P((char, const char *));
int (*pw_arg_end) __P((void));
void (*pw_end) __P((void));
int (*pw_chpw) __P((const char*));
int invalid;
#define INIT_INVALID 1
#define ARG_INVALID 2
int use_class;
} pw_modules[] = {
#ifdef KERBEROS5
{ NULL, "5ku:", "[-5] [-k] [-u principal]",
krb5_init, krb5_arg, krb5_arg_end, krb5_end, krb5_chpw, 0, 0 },
{ "kpasswd", "5ku:", "[-5] [-k] [-u principal]",
krb5_init, krb5_arg, krb5_arg_end, krb5_end, krb5_chpw, 0, 0 },
#endif
#ifdef YP
{ NULL, "y", "[-y]",
yp_init, yp_arg, yp_arg_end, yp_end, yp_chpw, 0, 0 },
{ "yppasswd", "", "[-y]",
yp_init, yp_arg, yp_arg_end, yp_end, yp_chpw, 0, 0 },
#endif
/* local */
{ NULL, "l", "[-l]",
local_init, local_arg, local_arg_end, local_end, local_chpw, 0, 0 },
/* terminator */
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
};
static void
usage(void)
{
int i;
fprintf(stderr, "usage:\n");
for (i = 0; pw_modules[i].pw_init != NULL; i++)
if (! (pw_modules[i].invalid & INIT_INVALID))
fprintf(stderr, "\t%s %s [user]\n", getprogname(),
pw_modules[i].usage);
exit(1);
}
int
main(int argc, char **argv)
{
int ch;
char *username;
char optstring[64]; /* if we ever get more than 64 args, shoot me. */
const char *curopt, *optopt;
int i, j;
int valid;
int use_always;
/* allow passwd modules to do argv[0] specific processing */
use_always = 0;
valid = 0;
for (i = 0; pw_modules[i].pw_init != NULL; i++) {
pw_modules[i].invalid = 0;
if (pw_modules[i].argv0) {
/*
* If we have a module that matches this progname, be
* sure that no modules but those that match this
* progname can be used. If we have a module that
* matches against a particular progname, but does NOT
* match this one, don't use that module.
*/
if ((strcmp(getprogname(), pw_modules[i].argv0) == 0) &&
use_always == 0) {
for (j = 0; j < i; j++) {
pw_modules[j].invalid |= INIT_INVALID;
(*pw_modules[j].pw_end)();
}
use_always = 1;
} else if (use_always == 0)
pw_modules[i].invalid |= INIT_INVALID;
} else if (use_always)
pw_modules[i].invalid |= INIT_INVALID;
if (pw_modules[i].invalid)
continue;
pw_modules[i].invalid |=
(*pw_modules[i].pw_init)(getprogname()) ?
/* zero on success, non-zero on error */
INIT_INVALID : 0;
if (! pw_modules[i].invalid)
valid = 1;
}
if (valid == 0)
errx(1, "Can't change password.");
/* Build the option string from the individual modules' option
* strings. Note that two modules can share a single option
* letter. */
optstring[0] = '\0';
j = 0;
for (i = 0; pw_modules[i].pw_init != NULL; i++) {
if (pw_modules[i].invalid)
continue;
curopt = pw_modules[i].args;
while (*curopt != '\0') {
if ((optopt = strchr(optstring, *curopt)) == NULL) {
optstring[j++] = *curopt;
if (curopt[1] == ':') {
curopt++;
optstring[j++] = *curopt;
}
optstring[j] = '\0';
} else if ((optopt[1] == ':' && curopt[1] != ':') ||
(optopt[1] != ':' && curopt[1] == ':')) {
errx(1, "NetBSD ERROR! Different password "
"modules have two different ideas about "
"%c argument format.", curopt[0]);
}
curopt++;
}
}
while ((ch = getopt(argc, argv, optstring)) != -1)
{
valid = 0;
for (i = 0; pw_modules[i].pw_init != NULL; i++) {
if (pw_modules[i].invalid)
continue;
if ((optopt = strchr(pw_modules[i].args, ch)) != NULL) {
j = (optopt[1] == ':') ?
! (*pw_modules[i].pw_arg)(ch, optarg) :
! (*pw_modules[i].pw_arg)(ch, NULL);
if (j != 0)
pw_modules[i].invalid |= ARG_INVALID;
if (pw_modules[i].invalid)
(*pw_modules[i].pw_end)();
} else {
/* arg doesn't match this module */
pw_modules[i].invalid |= ARG_INVALID;
(*pw_modules[i].pw_end)();
}
if (! pw_modules[i].invalid)
valid = 1;
}
if (! valid) {
usage();
exit(1);
}
}
/* select which module to use to actually change the password. */
use_always = 0;
valid = 0;
for (i = 0; pw_modules[i].pw_init != NULL; i++)
if (! pw_modules[i].invalid) {
pw_modules[i].use_class = (*pw_modules[i].pw_arg_end)();
if (pw_modules[i].use_class != PW_DONT_USE)
valid = 1;
if (pw_modules[i].use_class == PW_USE_FORCE)
use_always = 1;
}
if (! valid)
/* hang the DJ */
errx(1, "No valid password module specified.");
argc -= optind;
argv += optind;
username = getlogin();
if (username == NULL)
errx(1, "who are you ??");
switch(argc) {
case 0:
break;
case 1:
username = argv[0];
break;
default:
usage();
exit(1);
}
/* allow for fallback to other chpw() methods. */
for (i = 0; pw_modules[i].pw_init != NULL; i++) {
if (pw_modules[i].invalid)
continue;
if ((use_always && pw_modules[i].use_class == PW_USE_FORCE) ||
(!use_always && pw_modules[i].use_class == PW_USE)) {
valid = (*pw_modules[i].pw_chpw)(username);
(*pw_modules[i].pw_end)();
if (valid >= 0)
exit(valid);
/* return value < 0 indicates continuation. */
}
}
exit(1);
}
#endif /* USE_PAM */