source: heimdal/trunk/kdc/kstash.c@ 4

/*
 * 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;

    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)
        asprintf(&keyfile, "%s/m-key", hdb_db_dir(context));

    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, *old;
        asprintf(&old, "%s.old", keyfile);
        asprintf(&new, "%s.new", keyfile);
        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);
}