1 /* $NetBSD: kpasswd.c,v 1.3 2023/06/19 21:41:42 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan
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
39 static int version_flag;
40 static int help_flag;
41 static char *admin_principal_str;
42 static char *cred_cache_str;
43
44 static 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
52 static void
usage(int ret,struct getargs * a,int num_args)53 usage (int ret, struct getargs *a, int num_args)
54 {
55 arg_printusage (a, num_args, NULL, "[principal ...]");
56 exit (ret);
57 }
58
59 static int
change_password(krb5_context context,krb5_principal principal,krb5_ccache id)60 change_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
119 int
main(int argc,char ** argv)120 main (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