1/*	$NetBSD: kpasswd.c,v 1.3 2023/06/19 21:41:42 christos Exp $	*/
2
3/*
4 * Copyright (c) 1997-2004 Kungliga Tekniska H��gskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include "kpasswd_locl.h"
37__RCSID("$NetBSD: kpasswd.c,v 1.3 2023/06/19 21:41:42 christos Exp $");
38
39static int version_flag;
40static int help_flag;
41static char *admin_principal_str;
42static char *cred_cache_str;
43
44static struct getargs args[] = {
45    { "admin-principal",	0,   arg_string, &admin_principal_str, NULL,
46   	 NULL },
47    { "cache",			'c', arg_string, &cred_cache_str, NULL, NULL },
48    { "version", 		0,   arg_flag, &version_flag, NULL, NULL },
49    { "help",			0,   arg_flag, &help_flag, NULL, NULL }
50};
51
52static void
53usage (int ret, struct getargs *a, int num_args)
54{
55    arg_printusage (a, num_args, NULL, "[principal ...]");
56    exit (ret);
57}
58
59static int
60change_password(krb5_context context,
61		krb5_principal principal,
62		krb5_ccache id)
63{
64    krb5_data result_code_string, result_string;
65    int result_code;
66    krb5_error_code ret;
67    char pwbuf[BUFSIZ];
68    char *msg, *name;
69    int aret;
70
71    krb5_data_zero (&result_code_string);
72    krb5_data_zero (&result_string);
73
74    name = msg = NULL;
75    if (principal == NULL)
76	aret = asprintf(&msg, "New password: ");
77    else {
78	ret = krb5_unparse_name(context, principal, &name);
79	if (ret)
80	    krb5_err(context, 1, ret, "krb5_unparse_name");
81
82	aret = asprintf(&msg, "New password for %s: ", name);
83    }
84
85    if (aret == -1 || msg == NULL)
86	krb5_errx (context, 1, "out of memory");
87
88    ret = UI_UTIL_read_pw_string (pwbuf, sizeof(pwbuf), msg,
89				  UI_UTIL_FLAG_VERIFY);
90    free(msg);
91    if (name)
92	free(name);
93    if (ret != 0) {
94	return 1;
95    }
96
97    ret = krb5_set_password_using_ccache (context, id, pwbuf,
98					  principal,
99					  &result_code,
100					  &result_code_string,
101					  &result_string);
102    if (ret) {
103	krb5_warn (context, ret, "krb5_set_password_using_ccache");
104	return 1;
105    }
106
107    printf ("%s%s%.*s\n", krb5_passwd_result_to_string(context, result_code),
108	    result_string.length > 0 ? " : " : "",
109	    (int)result_string.length,
110	    result_string.length > 0 ? (char *)result_string.data : "");
111
112    krb5_data_free (&result_code_string);
113    krb5_data_free (&result_string);
114
115    return ret != 0;
116}
117
118
119int
120main (int argc, char **argv)
121{
122    krb5_error_code ret;
123    krb5_context context;
124    krb5_principal principal;
125    krb5_get_init_creds_opt *opt;
126    krb5_ccache id = NULL;
127    int exit_value;
128    int optidx = 0;
129
130    setprogname(argv[0]);
131
132    if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
133	usage(1, args, sizeof(args) / sizeof(args[0]));
134    if (help_flag)
135	usage(0, args, sizeof(args) / sizeof(args[0]));
136    if (version_flag) {
137	print_version(NULL);
138	return 0;
139    }
140    argc -= optidx;
141    argv += optidx;
142
143    ret = krb5_init_context (&context);
144    if (ret)
145	errx (1, "krb5_init_context failed: %d", ret);
146
147    ret = krb5_get_init_creds_opt_alloc (context, &opt);
148    if (ret)
149	krb5_err(context, 1, ret, "krb5_get_init_creds_opt_alloc");
150
151    krb5_get_init_creds_opt_set_tkt_life (opt, 300);
152    krb5_get_init_creds_opt_set_forwardable (opt, FALSE);
153    krb5_get_init_creds_opt_set_proxiable (opt, FALSE);
154
155    if (cred_cache_str) {
156	ret = krb5_cc_resolve(context, cred_cache_str, &id);
157	if (ret)
158	    krb5_err (context, 1, ret, "krb5_cc_resolve");
159    } else {
160	ret = krb5_cc_new_unique(context, krb5_cc_type_memory, NULL, &id);
161	if (ret)
162	    krb5_err (context, 1, ret, "krb5_cc_new_unique");
163    }
164
165    if (cred_cache_str == NULL) {
166	krb5_principal admin_principal = NULL;
167	krb5_creds cred;
168
169	if (admin_principal_str) {
170	    ret = krb5_parse_name (context, admin_principal_str,
171				   &admin_principal);
172	    if (ret)
173		krb5_err (context, 1, ret, "krb5_parse_name");
174	} else if (argc == 1) {
175	    ret = krb5_parse_name (context, argv[0], &admin_principal);
176	    if (ret)
177		krb5_err (context, 1, ret, "krb5_parse_name");
178	} else {
179	    ret = krb5_get_default_principal (context, &admin_principal);
180	    if (ret)
181		krb5_err (context, 1, ret, "krb5_get_default_principal");
182	}
183
184	ret = krb5_get_init_creds_password (context,
185					    &cred,
186					    admin_principal,
187					    NULL,
188					    krb5_prompter_posix,
189					    NULL,
190					    0,
191					    "kadmin/changepw",
192					    opt);
193	switch (ret) {
194	case 0:
195	    break;
196	case KRB5_LIBOS_PWDINTR :
197	    return 1;
198	case KRB5KRB_AP_ERR_BAD_INTEGRITY :
199	case KRB5KRB_AP_ERR_MODIFIED :
200	    krb5_errx(context, 1, "Password incorrect");
201	    break;
202	default:
203	    krb5_err(context, 1, ret, "krb5_get_init_creds");
204	}
205
206	krb5_get_init_creds_opt_free(context, opt);
207
208	ret = krb5_cc_initialize(context, id, admin_principal);
209	krb5_free_principal(context, admin_principal);
210	if (ret)
211	    krb5_err(context, 1, ret, "krb5_cc_initialize");
212
213	ret = krb5_cc_store_cred(context, id, &cred);
214	if (ret)
215	    krb5_err(context, 1, ret, "krb5_cc_store_cred");
216
217	krb5_free_cred_contents (context, &cred);
218    }
219
220    if (argc == 0) {
221	exit_value = change_password(context, NULL, id);
222    } else {
223	exit_value = 0;
224
225	while (argc-- > 0) {
226
227	    ret = krb5_parse_name (context, argv[0], &principal);
228	    if (ret)
229		krb5_err (context, 1, ret, "krb5_parse_name");
230
231	    ret = change_password(context, principal, id);
232	    if (ret)
233		exit_value = 1;
234	    krb5_free_principal(context, principal);
235	    argv++;
236	}
237    }
238
239    if (cred_cache_str == NULL) {
240	ret = krb5_cc_destroy(context, id);
241	if (ret)
242	    krb5_err (context, 1, ret, "krb5_cc_destroy");
243    } else {
244	ret = krb5_cc_close(context, id);
245	if (ret)
246	    krb5_err (context, 1, ret, "krb5_cc_close");
247    }
248
249    krb5_free_context (context);
250    return exit_value;
251}
252