1/*
2 * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "headers.h"
35
36krb5_context context;
37
38static char *keyfile;
39static int convert_flag;
40static int help_flag;
41static int version_flag;
42
43static int master_key_fd = -1;
44static int random_key_flag;
45
46static const char *enctype_str = "des3-cbc-sha1";
47
48static struct getargs args[] = {
49    { "enctype", 'e', arg_string, rk_UNCONST(&enctype_str), "encryption type",
50	NULL },
51    { "key-file", 'k', arg_string, &keyfile, "master key file", "file" },
52    { "convert-file", 0, arg_flag, &convert_flag,
53      "just convert keyfile to new format", NULL },
54    { "master-key-fd", 0, arg_integer, &master_key_fd,
55      "filedescriptor to read passphrase from", "fd" },
56    { "random-key", 0, arg_flag, &random_key_flag,
57	"generate a random master key", NULL },
58    { "help", 'h', arg_flag, &help_flag, NULL, NULL },
59    { "version", 0, arg_flag, &version_flag, NULL, NULL }
60};
61
62int num_args = sizeof(args) / sizeof(args[0]);
63
64int
65main(int argc, char **argv)
66{
67    char buf[1024];
68    krb5_error_code ret;
69
70    krb5_enctype enctype;
71
72    hdb_master_key mkey;
73
74    krb5_program_setup(&context, argc, argv, args, num_args, NULL);
75
76    if(help_flag)
77	krb5_std_usage(0, args, num_args);
78    if(version_flag){
79	print_version(NULL);
80	exit(0);
81    }
82
83    if (master_key_fd != -1 && random_key_flag)
84	krb5_errx(context, 1, "random-key and master-key-fd "
85		  "is mutual exclusive");
86
87    if (keyfile == NULL)
88	asprintf(&keyfile, "%s/m-key", hdb_db_dir(context));
89
90    ret = krb5_string_to_enctype(context, enctype_str, &enctype);
91    if(ret)
92	krb5_err(context, 1, ret, "krb5_string_to_enctype");
93
94    ret = hdb_read_master_key(context, keyfile, &mkey);
95    if(ret && ret != ENOENT)
96	krb5_err(context, 1, ret, "reading master key from %s", keyfile);
97
98    if (convert_flag) {
99	if (ret)
100	    krb5_err(context, 1, ret, "reading master key from %s", keyfile);
101    } else {
102	krb5_keyblock key;
103	krb5_salt salt;
104	salt.salttype = KRB5_PW_SALT;
105	/* XXX better value? */
106	salt.saltvalue.data = NULL;
107	salt.saltvalue.length = 0;
108	if (random_key_flag) {
109	    ret = krb5_generate_random_keyblock(context, enctype, &key);
110	    if (ret)
111		krb5_err(context, 1, ret, "krb5_generate_random_keyblock");
112
113	} else {
114	    if(master_key_fd != -1) {
115		ssize_t n;
116		n = read(master_key_fd, buf, sizeof(buf));
117		if(n <= 0)
118		    krb5_err(context, 1, errno, "failed to read passphrase");
119		buf[n] = '\0';
120		buf[strcspn(buf, "\r\n")] = '\0';
121
122	    } else {
123		if(UI_UTIL_read_pw_string(buf, sizeof(buf), "Master key: ", 1))
124		    exit(1);
125	    }
126	    krb5_string_to_key_salt(context, enctype, buf, salt, &key);
127	}
128	ret = hdb_add_master_key(context, &key, &mkey);
129
130	krb5_free_keyblock_contents(context, &key);
131
132    }
133
134    {
135	char *new, *old;
136	asprintf(&old, "%s.old", keyfile);
137	asprintf(&new, "%s.new", keyfile);
138	if(unlink(new) < 0 && errno != ENOENT) {
139	    ret = errno;
140	    goto out;
141	}
142	krb5_warnx(context, "writing key to `%s'", keyfile);
143	ret = hdb_write_master_key(context, new, mkey);
144	if(ret)
145	    unlink(new);
146	else {
147#ifndef NO_POSIX_LINKS
148	    unlink(old);
149	    if(link(keyfile, old) < 0 && errno != ENOENT) {
150		ret = errno;
151		unlink(new);
152	    } else {
153#endif
154		if(rename(new, keyfile) < 0) {
155		    ret = errno;
156		}
157#ifndef NO_POSIX_LINKS
158	    }
159#endif
160	}
161    out:
162	free(old);
163	free(new);
164	if(ret)
165	    krb5_warn(context, errno, "writing master key file");
166    }
167
168    hdb_free_master_key(context, mkey);
169
170    exit(ret != 0);
171}
172