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
36 krb5_context context;
37
38 static char *keyfile;
39 static int convert_flag;
40 static int help_flag;
41 static int version_flag;
42
43 static int master_key_fd = -1;
44 static int random_key_flag;
45
46 static const char *enctype_str = "des3-cbc-sha1";
47
48 static 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
62 int num_args = sizeof(args) / sizeof(args[0]);
63
64 int
main(int argc,char ** argv)65 main(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 if (ret)
130 krb5_err(context, 1, ret, "hdb_add_master_key");
131
132 krb5_free_keyblock_contents(context, &key);
133
134 }
135
136 {
137 char *new, *old;
138 asprintf(&old, "%s.old", keyfile);
139 asprintf(&new, "%s.new", keyfile);
140 if(unlink(new) < 0 && errno != ENOENT) {
141 ret = errno;
142 goto out;
143 }
144 krb5_warnx(context, "writing key to `%s'", keyfile);
145 ret = hdb_write_master_key(context, new, mkey);
146 if(ret)
147 unlink(new);
148 else {
149 #ifndef NO_POSIX_LINKS
150 unlink(old);
151 if(link(keyfile, old) < 0 && errno != ENOENT) {
152 ret = errno;
153 unlink(new);
154 } else {
155 #endif
156 if(rename(new, keyfile) < 0) {
157 ret = errno;
158 }
159 #ifndef NO_POSIX_LINKS
160 }
161 #endif
162 }
163 out:
164 free(old);
165 free(new);
166 if(ret)
167 krb5_warn(context, errno, "writing master key file");
168 }
169
170 hdb_free_master_key(context, mkey);
171
172 exit(ret != 0);
173 }
174