365 lines
8.7 KiB
C
365 lines
8.7 KiB
C
/* $NetBSD: krb5_passwd.c,v 1.20 2012/04/22 23:43:51 christos Exp $ */
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/*
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* Copyright (c) 2000, 2005 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Johan Danielsson; and by Jason R. Thorpe.
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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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*
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* uses the `Kerberos Change Password Protocol' */
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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 <err.h>
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#include <errno.h>
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#include <pwd.h>
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#include <unistd.h>
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#include <openssl/ui.h>
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#include <krb5.h>
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#include "extern.h"
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static void
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pwkrb5_warn(const char *msg, krb5_context context, krb5_error_code ret)
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{
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const char *errtxt = krb5_get_error_message(context, ret);
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if (errtxt != NULL) {
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warnx("%s: %s", msg, errtxt);
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krb5_free_error_message(context, errtxt);
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} else
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warnx("%s: %d", msg, ret);
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}
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#ifdef USE_PAM
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void
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pwkrb5_usage(const char *prefix)
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{
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(void) fprintf(stderr, "%s %s [-d krb5 | -k] [principal]\n",
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prefix, getprogname());
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}
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void
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pwkrb5_argv0_usage(const char *prefix)
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{
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(void) fprintf(stderr, "%s %s [principal]\n",
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prefix, getprogname());
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}
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void
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pwkrb5_process(const char *username, int argc, char **argv)
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{
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krb5_context context;
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krb5_error_code ret;
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krb5_get_init_creds_opt *opt;
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krb5_principal principal;
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krb5_creds cred;
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int result_code;
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krb5_data result_code_string, result_string;
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char pwbuf[BUFSIZ];
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int ch;
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while ((ch = getopt(argc, argv, "5ku:")) != -1) {
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switch (ch) {
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case '5':
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/*
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* Compatibility option that historically
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* specified to use Kerberos 5. Silently
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* ignore it.
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*/
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break;
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case 'k':
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/*
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* Absorb the -k that may have gotten us here.
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*/
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break;
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case 'u':
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/*
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* Historical option to specify principal.
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*/
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username = optarg;
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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}
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argc -= optind;
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argv += optind;
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switch (argc) {
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case 0:
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/* username already provided */
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break;
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case 1:
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/* overrides -u <principal> */
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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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/* NOTREACHED */
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}
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ret = krb5_init_context(&context);
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if (ret != 0) {
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if (ret == ENXIO)
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errx(1, "Kerberos 5 not in use.");
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errx(1, "Unable to initialize Kerberos 5: %s", strerror(ret));
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}
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ret = krb5_get_init_creds_opt_alloc(context, &opt);
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if (ret) {
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pwkrb5_warn("failed to allocate opts", context, ret);
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goto bad;
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}
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krb5_get_init_creds_opt_set_tkt_life(opt, 300L);
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krb5_get_init_creds_opt_set_forwardable(opt, FALSE);
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krb5_get_init_creds_opt_set_proxiable(opt, FALSE);
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ret = krb5_parse_name(context, username, &principal);
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if (ret) {
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krb5_get_init_creds_opt_free(context, opt);
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pwkrb5_warn("failed to parse principal", context, ret);
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goto bad;
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}
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ret = krb5_get_init_creds_password(context,
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&cred,
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principal,
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NULL,
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krb5_prompter_posix,
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NULL,
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0L,
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"kadmin/changepw",
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opt);
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krb5_get_init_creds_opt_free(context, opt);
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switch (ret) {
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case 0:
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break;
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case KRB5_LIBOS_PWDINTR :
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/* XXX */
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goto bad;
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case KRB5KRB_AP_ERR_BAD_INTEGRITY :
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case KRB5KRB_AP_ERR_MODIFIED :
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fprintf(stderr, "Password incorrect\n");
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goto bad;
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default:
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pwkrb5_warn("failed to get credentials", context, ret);
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goto bad;
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}
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krb5_data_zero(&result_code_string);
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krb5_data_zero(&result_string);
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/* XXX use getpass? It has a broken interface. */
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if (UI_UTIL_read_pw_string(pwbuf, sizeof(pwbuf),
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"New password: ", 1) != 0)
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goto bad;
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ret = krb5_set_password(context, &cred, pwbuf, NULL,
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&result_code,
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&result_code_string,
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&result_string);
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if (ret) {
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pwkrb5_warn("unable to set password", context, ret);
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goto bad;
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}
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printf("%s%s%.*s\n",
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krb5_passwd_result_to_string(context, result_code),
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result_string.length > 0 ? " : " : "",
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(int)result_string.length,
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result_string.length > 0 ? (char *)result_string.data : "");
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krb5_data_free(&result_code_string);
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krb5_data_free(&result_string);
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krb5_free_cred_contents(context, &cred);
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krb5_free_context(context);
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if (result_code)
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exit(1);
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return;
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bad:
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krb5_free_context(context);
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exit(1);
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}
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#else /* ! USE_PAM */
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static krb5_context defcontext;
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static krb5_principal defprinc;
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static int kusage = PW_USE;
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int
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krb5_init(const char *progname)
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{
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return krb5_init_context(&defcontext);
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}
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int
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krb5_arg (char ch, const char *opt)
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{
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krb5_error_code ret;
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switch(ch) {
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case '5':
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case 'k':
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kusage = PW_USE_FORCE;
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return 1;
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case 'u':
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ret = krb5_parse_name(defcontext, opt, &defprinc);
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if(ret) {
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krb5_warn(defcontext, ret, "%s", opt);
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return 0;
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}
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return 1;
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}
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return 0;
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}
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int
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krb5_arg_end(void)
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{
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return kusage;
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}
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void
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krb5_end(void)
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{
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if (defcontext == NULL)
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return;
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if(defprinc)
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krb5_free_principal(defcontext, defprinc);
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krb5_free_context(defcontext);
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}
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int
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krb5_chpw(const char *username)
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{
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krb5_error_code ret;
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krb5_context context;
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krb5_principal principal;
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krb5_get_init_creds_opt *opt;
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krb5_creds cred;
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int result_code;
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krb5_data result_code_string, result_string;
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char pwbuf[BUFSIZ];
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ret = krb5_init_context (&context);
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if (ret) {
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pwkrb5_warn("failed kerberos initialisation", context, ret);
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return 1;
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}
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ret = krb5_get_init_creds_opt_alloc (context, &opt);
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if (ret) {
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pwkrb5_warn("failed to allocate credential opt", context, ret);
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return 1;
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}
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krb5_get_init_creds_opt_set_tkt_life (opt, 300);
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krb5_get_init_creds_opt_set_forwardable (opt, FALSE);
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krb5_get_init_creds_opt_set_proxiable (opt, FALSE);
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if(username != NULL) {
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ret = krb5_parse_name (context, username, &principal);
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if (ret) {
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krb5_get_init_creds_opt_free (context, opt);
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pwkrb5_warn("failed to parse principal", context, ret);
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return 1;
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}
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} else
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principal = defprinc;
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ret = krb5_get_init_creds_password (context,
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&cred,
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principal,
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NULL,
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krb5_prompter_posix,
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NULL,
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0,
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"kadmin/changepw",
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opt);
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krb5_get_init_creds_opt_free (context, opt);
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switch (ret) {
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case 0:
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break;
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case KRB5_LIBOS_PWDINTR :
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/* XXX */
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return 1;
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case KRB5KRB_AP_ERR_BAD_INTEGRITY :
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case KRB5KRB_AP_ERR_MODIFIED :
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fprintf(stderr, "Password incorrect\n");
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return 1;
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break;
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default:
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pwkrb5_warn("failed to get credentials", context, ret);
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return 1;
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}
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krb5_data_zero (&result_code_string);
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krb5_data_zero (&result_string);
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/* XXX use getpass? It has a broken interface. */
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if(UI_UTIL_read_pw_string(pwbuf, sizeof(pwbuf), "New password: ", 1) != 0)
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return 1;
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ret = krb5_set_password (context, &cred, pwbuf, NULL,
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&result_code,
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&result_code_string,
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&result_string);
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if (ret)
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krb5_err (context, 1, ret, "krb5_set_password");
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printf ("%s%s%.*s\n", krb5_passwd_result_to_string(context, result_code),
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result_string.length > 0 ? " : " : "",
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(int)result_string.length,
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result_string.length > 0 ? (char *)result_string.data : "");
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krb5_data_free (&result_code_string);
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krb5_data_free (&result_string);
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krb5_free_cred_contents (context, &cred);
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krb5_free_context (context);
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return result_code;
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}
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#endif /* USE_PAM */
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