stash.c revision 233294 
1/*
2 * Copyright (c) 2004 Kungliga Tekniska H��gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include "kadmin_locl.h"
37#include "kadmin-commands.h"
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		n = 0;
93	    }
94	    buf[n] = '\0';
95	    buf[strcspn(buf, "\r\n")] = '\0';
96	} else if (opt->random_password_flag) {
97	    random_password (buf, sizeof(buf));
98	    printf("Using random master stash password: %s\n", buf);
99	} else {
100	    if(UI_UTIL_read_pw_string(buf, sizeof(buf), "Master key: ", 1)) {
101		hdb_free_master_key(context, mkey);
102		return 0;
103	    }
104	}
105	ret = krb5_string_to_key_salt(context, enctype, buf, salt, &key);
106	ret = hdb_add_master_key(context, &key, &mkey);
107	krb5_free_keyblock_contents(context, &key);
108    }
109
110    {
111	char *new, *old;
112	asprintf(&old, "%s.old", opt->key_file_string);
113	asprintf(&new, "%s.new", opt->key_file_string);
114	if(old == NULL || new == NULL) {
115	    ret = ENOMEM;
116	    goto out;
117	}
118
119	if(unlink(new) < 0 && errno != ENOENT) {
120	    ret = errno;
121	    goto out;
122	}
123	krb5_warnx(context, "writing key to \"%s\"", opt->key_file_string);
124	ret = hdb_write_master_key(context, new, mkey);
125	if(ret)
126	    unlink(new);
127	else {
128	    unlink(old);
129#ifndef NO_POSIX_LINKS
130	    if(link(opt->key_file_string, old) < 0 && errno != ENOENT) {
131		ret = errno;
132		unlink(new);
133	    } else {
134#endif
135		if(rename(new, opt->key_file_string) < 0) {
136		    ret = errno;
137		}
138#ifndef NO_POSIX_LINKS
139	    }
140#endif
141	}
142    out:
143	free(old);
144	free(new);
145	if(ret)
146	    krb5_warn(context, errno, "writing master key file");
147    }
148
149    hdb_free_master_key(context, mkey);
150    return 0;
151}
152