stash.c revision 178825 
1/*
2 * Copyright (c) 2004 Kungliga Tekniska H�gskolan
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 "kadmin_locl.h"
35#include "kadmin-commands.h"
36
37RCSID("$Id: stash.c 22251 2007-12-09 05:58:43Z lha $");
38
39extern int local_flag;
40
41int
42stash(struct stash_options *opt, int argc, char **argv)
43{
44    char buf[1024];
45    krb5_error_code ret;
46    krb5_enctype enctype;
47    hdb_master_key mkey;
48
49    if(!local_flag) {
50	krb5_warnx(context, "stash is only available in local (-l) mode");
51	return 0;
52    }
53
54    ret = krb5_string_to_enctype(context, opt->enctype_string, &enctype);
55    if(ret) {
56	krb5_warn(context, ret, "%s", opt->enctype_string);
57	return 0;
58    }
59
60    if(opt->key_file_string == NULL) {
61	asprintf(&opt->key_file_string, "%s/m-key", hdb_db_dir(context));
62	if (opt->key_file_string == NULL)
63	    errx(1, "out of memory");
64    }
65
66    ret = hdb_read_master_key(context, opt->key_file_string, &mkey);
67    if(ret && ret != ENOENT) {
68	krb5_warn(context, ret, "reading master key from %s",
69		  opt->key_file_string);
70	return 0;
71    }
72
73    if (opt->convert_file_flag) {
74	if (ret)
75	    krb5_warn(context, ret, "reading master key from %s",
76		      opt->key_file_string);
77	return 0;
78    } else {
79	krb5_keyblock key;
80	krb5_salt salt;
81	salt.salttype = KRB5_PW_SALT;
82	/* XXX better value? */
83	salt.saltvalue.data = NULL;
84	salt.saltvalue.length = 0;
85	if(opt->master_key_fd_integer != -1) {
86	    ssize_t n;
87	    n = read(opt->master_key_fd_integer, buf, sizeof(buf));
88	    if(n == 0)
89		krb5_warnx(context, "end of file reading passphrase");
90	    else if(n < 0)
91		krb5_warn(context, errno, "reading passphrase");
92	    buf[n] = '\0';
93	    buf[strcspn(buf, "\r\n")] = '\0';
94	} else {
95	    if(UI_UTIL_read_pw_string(buf, sizeof(buf), "Master key: ", 1)) {
96		hdb_free_master_key(context, mkey);
97		return 0;
98	    }
99	}
100	ret = krb5_string_to_key_salt(context, enctype, buf, salt, &key);
101	ret = hdb_add_master_key(context, &key, &mkey);
102	krb5_free_keyblock_contents(context, &key);
103    }
104
105    {
106	char *new, *old;
107	asprintf(&old, "%s.old", opt->key_file_string);
108	asprintf(&new, "%s.new", opt->key_file_string);
109	if(old == NULL || new == NULL) {
110	    ret = ENOMEM;
111	    goto out;
112	}
113
114	if(unlink(new) < 0 && errno != ENOENT) {
115	    ret = errno;
116	    goto out;
117	}
118	krb5_warnx(context, "writing key to \"%s\"", opt->key_file_string);
119	ret = hdb_write_master_key(context, new, mkey);
120	if(ret)
121	    unlink(new);
122	else {
123	    unlink(old);
124	    if(link(opt->key_file_string, old) < 0 && errno != ENOENT) {
125		ret = errno;
126		unlink(new);
127	    } else if(rename(new, opt->key_file_string) < 0) {
128		ret = errno;
129	    }
130	}
131    out:
132	free(old);
133	free(new);
134	if(ret)
135	    krb5_warn(context, errno, "writing master key file");
136    }
137
138    hdb_free_master_key(context, mkey);
139    return 0;
140}
141