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/*
* Copyright (c) 1997-2004 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "headers.h"
krb5_context context;
static char *keyfile;
static int convert_flag;
static int help_flag;
static int version_flag;
static int master_key_fd = -1;
static int random_key_flag;
static const char *enctype_str = "des3-cbc-sha1";
static struct getargs args[] = {
{ "enctype", 'e', arg_string, rk_UNCONST(&enctype_str), "encryption type",
NULL },
{ "key-file", 'k', arg_string, &keyfile, "master key file", "file" },
{ "convert-file", 0, arg_flag, &convert_flag,
"just convert keyfile to new format", NULL },
{ "master-key-fd", 0, arg_integer, &master_key_fd,
"filedescriptor to read passphrase from", "fd" },
{ "random-key", 0, arg_flag, &random_key_flag,
"generate a random master key", NULL },
{ "help", 'h', arg_flag, &help_flag, NULL, NULL },
{ "version", 0, arg_flag, &version_flag, NULL, NULL }
};
int num_args = sizeof(args) / sizeof(args[0]);
int
main(int argc, char **argv)
{
char buf[1024];
krb5_error_code ret;
int aret;
krb5_enctype enctype;
hdb_master_key mkey;
krb5_program_setup(&context, argc, argv, args, num_args, NULL);
if(help_flag)
krb5_std_usage(0, args, num_args);
if(version_flag){
print_version(NULL);
exit(0);
}
if (master_key_fd != -1 && random_key_flag)
krb5_errx(context, 1, "random-key and master-key-fd "
"is mutual exclusive");
if (keyfile == NULL) {
aret = asprintf(&keyfile, "%s/m-key", hdb_db_dir(context));
if (aret == -1)
krb5_errx(context, 1, "out of memory");
}
ret = krb5_string_to_enctype(context, enctype_str, &enctype);
if(ret)
krb5_err(context, 1, ret, "krb5_string_to_enctype");
ret = hdb_read_master_key(context, keyfile, &mkey);
if(ret && ret != ENOENT)
krb5_err(context, 1, ret, "reading master key from %s", keyfile);
if (convert_flag) {
if (ret)
krb5_err(context, 1, ret, "reading master key from %s", keyfile);
} else {
krb5_keyblock key;
krb5_salt salt;
salt.salttype = KRB5_PW_SALT;
/* XXX better value? */
salt.saltvalue.data = NULL;
salt.saltvalue.length = 0;
if (random_key_flag) {
ret = krb5_generate_random_keyblock(context, enctype, &key);
if (ret)
krb5_err(context, 1, ret, "krb5_generate_random_keyblock");
} else {
if(master_key_fd != -1) {
ssize_t n;
n = read(master_key_fd, buf, sizeof(buf));
if(n <= 0)
krb5_err(context, 1, errno, "failed to read passphrase");
buf[n] = '\0';
buf[strcspn(buf, "\r\n")] = '\0';
} else {
if(UI_UTIL_read_pw_string(buf, sizeof(buf), "Master key: ", 1))
exit(1);
}
krb5_string_to_key_salt(context, enctype, buf, salt, &key);
}
ret = hdb_add_master_key(context, &key, &mkey);
krb5_free_keyblock_contents(context, &key);
}
{
char *new = NULL, *old = NULL;
aret = asprintf(&old, "%s.old", keyfile);
if (aret == -1) {
old = NULL;
ret = ENOMEM;
goto out;
}
aret = asprintf(&new, "%s.new", keyfile);
if (aret == -1) {
new = NULL;
ret = ENOMEM;
goto out;
}
if(unlink(new) < 0 && errno != ENOENT) {
ret = errno;
goto out;
}
krb5_warnx(context, "writing key to `%s'", keyfile);
ret = hdb_write_master_key(context, new, mkey);
if(ret)
unlink(new);
else {
#ifndef NO_POSIX_LINKS
unlink(old);
if(link(keyfile, old) < 0 && errno != ENOENT) {
ret = errno;
unlink(new);
} else {
#endif
if(rename(new, keyfile) < 0) {
ret = errno;
}
#ifndef NO_POSIX_LINKS
}
#endif
}
out:
free(old);
free(new);
if(ret)
krb5_warn(context, errno, "writing master key file");
}
hdb_free_master_key(context, mkey);
exit(ret != 0);
}
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