NetBSD-5.0.2/usr.bin/passwd/krb5_passwd.c
/* $NetBSD: krb5_passwd.c,v 1.17 2008/04/28 20:24:14 martin Exp $ */
/*
* Copyright (c) 2000, 2005 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Johan Danielsson; and by Jason R. Thorpe.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/* uses the `Kerberos Change Password Protocol' */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <errno.h>
#include <pwd.h>
#include <unistd.h>
#include <openssl/ui.h>
#include <krb5.h>
#include "extern.h"
#ifdef USE_PAM
void
pwkrb5_usage(const char *prefix)
{
(void) fprintf(stderr, "%s %s [-d krb5 | -k] [principal]\n",
prefix, getprogname());
}
void
pwkrb5_argv0_usage(const char *prefix)
{
(void) fprintf(stderr, "%s %s [principal]\n",
prefix, getprogname());
}
void
pwkrb5_process(const char *username, int argc, char **argv)
{
krb5_context context;
krb5_error_code ret;
krb5_get_init_creds_opt opt;
krb5_principal principal;
krb5_creds cred;
int result_code;
krb5_data result_code_string, result_string;
char pwbuf[BUFSIZ];
int ch;
while ((ch = getopt(argc, argv, "5ku:")) != -1) {
switch (ch) {
case '5':
/*
* Compatibility option that historically
* specified to use Kerberos 5. Silently
* ignore it.
*/
break;
case 'k':
/*
* Absorb the -k that may have gotten us here.
*/
break;
case 'u':
/*
* Historical option to specify principal.
*/
username = optarg;
break;
default:
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
switch (argc) {
case 0:
/* username already provided */
break;
case 1:
/* overrides -u <principal> */
username = argv[0];
break;
default:
usage();
/* NOTREACHED */
}
ret = krb5_init_context(&context);
if (ret != 0) {
if (ret == ENXIO)
errx(1, "Kerberos 5 not in use.");
warnx("Unable to initialize Kerberos 5: %s",
krb5_get_err_text(context, ret));
goto bad;
}
krb5_get_init_creds_opt_init(&opt);
krb5_get_init_creds_opt_set_tkt_life(&opt, 300L);
krb5_get_init_creds_opt_set_forwardable(&opt, FALSE);
krb5_get_init_creds_opt_set_proxiable(&opt, FALSE);
ret = krb5_parse_name(context, username, &principal);
if (ret) {
warnx("failed to parse principal: %s",
krb5_get_err_text(context, ret));
goto bad;
}
ret = krb5_get_init_creds_password(context,
&cred,
principal,
NULL,
krb5_prompter_posix,
NULL,
0L,
"kadmin/changepw",
&opt);
switch (ret) {
case 0:
break;
case KRB5_LIBOS_PWDINTR :
/* XXX */
goto bad;
case KRB5KRB_AP_ERR_BAD_INTEGRITY :
case KRB5KRB_AP_ERR_MODIFIED :
fprintf(stderr, "Password incorrect\n");
goto bad;
default:
warnx("failed to get credentials: %s",
krb5_get_err_text(context, ret));
goto bad;
}
krb5_data_zero(&result_code_string);
krb5_data_zero(&result_string);
/* XXX use getpass? It has a broken interface. */
if (UI_UTIL_read_pw_string(pwbuf, sizeof(pwbuf),
"New password: ", 1) != 0)
goto bad;
ret = krb5_set_password(context, &cred, pwbuf, NULL,
&result_code,
&result_code_string,
&result_string);
if (ret) {
warnx("unable to set password: %s",
krb5_get_err_text(context, ret));
goto bad;
}
printf("%s%s%.*s\n",
krb5_passwd_result_to_string(context, result_code),
result_string.length > 0 ? " : " : "",
(int)result_string.length,
result_string.length > 0 ? (char *)result_string.data : "");
krb5_data_free(&result_code_string);
krb5_data_free(&result_string);
krb5_free_cred_contents(context, &cred);
krb5_free_context(context);
if (result_code)
exit(1);
return;
bad:
krb5_free_context(context);
exit(1);
}
#else /* ! USE_PAM */
static krb5_context context;
static krb5_principal defprinc;
static int kusage = PW_USE;
int
krb5_init(const char *progname)
{
return krb5_init_context(&context);
}
int
krb5_arg (char ch, const char *optarg)
{
krb5_error_code ret;
switch(ch) {
case '5':
case 'k':
kusage = PW_USE_FORCE;
return 1;
case 'u':
ret = krb5_parse_name(context, optarg, &defprinc);
if(ret) {
krb5_warn(context, ret, "%s", optarg);
return 0;
}
return 1;
}
return 0;
}
int
krb5_arg_end(void)
{
return kusage;
}
void
krb5_end(void)
{
if (context == NULL)
return;
if(defprinc)
krb5_free_principal(context, defprinc);
krb5_free_context(context);
}
int
krb5_chpw(const char *username)
{
krb5_error_code ret;
krb5_context context;
krb5_principal principal;
krb5_get_init_creds_opt opt;
krb5_creds cred;
int result_code;
krb5_data result_code_string, result_string;
char pwbuf[BUFSIZ];
ret = krb5_init_context (&context);
if (ret) {
warnx("failed kerberos initialisation: %s",
krb5_get_err_text(context, ret));
return 1;
}
krb5_get_init_creds_opt_init (&opt);
krb5_get_init_creds_opt_set_tkt_life (&opt, 300);
krb5_get_init_creds_opt_set_forwardable (&opt, FALSE);
krb5_get_init_creds_opt_set_proxiable (&opt, FALSE);
if(username != NULL) {
ret = krb5_parse_name (context, username, &principal);
if (ret) {
warnx("failed to parse principal: %s",
krb5_get_err_text(context, ret));
return 1;
}
} else
principal = defprinc;
ret = krb5_get_init_creds_password (context,
&cred,
principal,
NULL,
krb5_prompter_posix,
NULL,
0,
"kadmin/changepw",
&opt);
switch (ret) {
case 0:
break;
case KRB5_LIBOS_PWDINTR :
/* XXX */
return 1;
case KRB5KRB_AP_ERR_BAD_INTEGRITY :
case KRB5KRB_AP_ERR_MODIFIED :
fprintf(stderr, "Password incorrect\n");
return 1;
break;
default:
warnx("failed to get credentials: %s",
krb5_get_err_text(context, ret));
return 1;
}
krb5_data_zero (&result_code_string);
krb5_data_zero (&result_string);
/* XXX use getpass? It has a broken interface. */
if(UI_UTIL_read_pw_string(pwbuf, sizeof(pwbuf), "New password: ", 1) != 0)
return 1;
ret = krb5_set_password (context, &cred, pwbuf, NULL,
&result_code,
&result_code_string,
&result_string);
if (ret)
krb5_err (context, 1, ret, "krb5_set_password");
printf ("%s%s%.*s\n", krb5_passwd_result_to_string(context, result_code),
result_string.length > 0 ? " : " : "",
(int)result_string.length,
result_string.length > 0 ? (char *)result_string.data : "");
krb5_data_free (&result_code_string);
krb5_data_free (&result_string);
krb5_free_cred_contents (context, &cred);
krb5_free_context (context);
return result_code;
}
#endif /* USE_PAM */