2 * Copyright (c) 2000 - 2002 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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.
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.
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
39 RCSID("$Id: mkey.c,v 1.15 2003/03/28 02:01:33 lha Exp $");
41 struct hdb_master_key_data {
42 krb5_keytab_entry keytab;
44 struct hdb_master_key_data *next;
48 hdb_free_master_key(krb5_context context, hdb_master_key mkey)
50 struct hdb_master_key_data *ptr;
52 krb5_kt_free_entry(context, &mkey->keytab);
54 krb5_crypto_destroy(context, mkey->crypto);
62 hdb_process_master_key(krb5_context context,
63 int kvno, krb5_keyblock *key, krb5_enctype etype,
68 *mkey = calloc(1, sizeof(**mkey));
70 krb5_set_error_string(context, "malloc: out of memory");
73 (*mkey)->keytab.vno = kvno;
74 ret = krb5_parse_name(context, "K/M", &(*mkey)->keytab.principal);
77 ret = krb5_copy_keyblock_contents(context, key, &(*mkey)->keytab.keyblock);
81 (*mkey)->keytab.keyblock.keytype = etype;
82 (*mkey)->keytab.timestamp = time(NULL);
83 ret = krb5_crypto_init(context, key, etype, &(*mkey)->crypto);
88 hdb_free_master_key(context, *mkey);
94 hdb_add_master_key(krb5_context context, krb5_keyblock *key,
95 hdb_master_key *inout)
101 for(p = *inout; p; p = p->next)
102 vno = max(vno, p->keytab.vno);
104 ret = hdb_process_master_key(context, vno, key, 0, &p);
112 static krb5_error_code
113 read_master_keytab(krb5_context context, const char *filename,
114 hdb_master_key *mkey)
118 krb5_kt_cursor cursor;
119 krb5_keytab_entry entry;
122 ret = krb5_kt_resolve(context, filename, &id);
126 ret = krb5_kt_start_seq_get(context, id, &cursor);
130 while(krb5_kt_next_entry(context, id, &entry, &cursor) == 0) {
131 p = calloc(1, sizeof(*p));
133 ret = krb5_crypto_init(context, &p->keytab.keyblock, 0, &p->crypto);
137 krb5_kt_end_seq_get(context, id, &cursor);
139 krb5_kt_close(context, id);
143 /* read a MIT master keyfile */
144 static krb5_error_code
145 read_master_mit(krb5_context context, const char *filename,
146 hdb_master_key *mkey)
154 fd = open(filename, O_RDONLY | O_BINARY);
156 int save_errno = errno;
157 krb5_set_error_string(context, "failed to open %s: %s", filename,
158 strerror(save_errno));
161 sp = krb5_storage_from_fd(fd);
166 krb5_storage_set_flags(sp, KRB5_STORAGE_HOST_BYTEORDER);
168 /* could possibly use ret_keyblock here, but do it with more
170 ret = krb5_ret_keyblock(sp, &key);
172 ret = krb5_ret_int16(sp, &enctype);
173 if((htons(enctype) & 0xff00) == 0x3000) {
174 krb5_set_error_string(context, "unknown keytype in %s: %#x, expected %#x",
175 filename, htons(enctype), 0x3000);
176 ret = HEIM_ERR_BAD_MKEY;
179 key.keytype = enctype;
180 ret = krb5_ret_data(sp, &key.keyvalue);
184 ret = hdb_process_master_key(context, 0, &key, 0, mkey);
185 krb5_free_keyblock_contents(context, &key);
187 krb5_storage_free(sp);
192 /* read an old master key file */
193 static krb5_error_code
194 read_master_encryptionkey(krb5_context context, const char *filename,
195 hdb_master_key *mkey)
200 unsigned char buf[256];
204 fd = open(filename, O_RDONLY | O_BINARY);
206 int save_errno = errno;
207 krb5_set_error_string(context, "failed to open %s: %s",
208 filename, strerror(save_errno));
212 len = read(fd, buf, sizeof(buf));
215 int save_errno = errno;
216 krb5_set_error_string(context, "error reading %s: %s",
217 filename, strerror(save_errno));
221 ret = decode_EncryptionKey(buf, len, &key, &ret_len);
222 memset(buf, 0, sizeof(buf));
226 /* Originally, the keytype was just that, and later it got changed
227 to des-cbc-md5, but we always used des in cfb64 mode. This
228 should cover all cases, but will break if someone has hacked
229 this code to really use des-cbc-md5 -- but then that's not my
231 if(key.keytype == KEYTYPE_DES || key.keytype == ETYPE_DES_CBC_MD5)
232 key.keytype = ETYPE_DES_CFB64_NONE;
234 ret = hdb_process_master_key(context, 0, &key, 0, mkey);
235 krb5_free_keyblock_contents(context, &key);
239 /* read a krb4 /.k style file */
240 static krb5_error_code
241 read_master_krb4(krb5_context context, const char *filename,
242 hdb_master_key *mkey)
247 unsigned char buf[256];
250 fd = open(filename, O_RDONLY | O_BINARY);
252 int save_errno = errno;
253 krb5_set_error_string(context, "failed to open %s: %s",
254 filename, strerror(save_errno));
258 len = read(fd, buf, sizeof(buf));
261 int save_errno = errno;
262 krb5_set_error_string(context, "error reading %s: %s",
263 filename, strerror(save_errno));
267 krb5_set_error_string(context, "bad contents of %s", filename);
268 return HEIM_ERR_EOF; /* XXX file might be too large */
271 memset(&key, 0, sizeof(key));
272 key.keytype = ETYPE_DES_PCBC_NONE;
273 ret = krb5_data_copy(&key.keyvalue, buf, len);
274 memset(buf, 0, sizeof(buf));
278 ret = hdb_process_master_key(context, 0, &key, 0, mkey);
279 krb5_free_keyblock_contents(context, &key);
284 hdb_read_master_key(krb5_context context, const char *filename,
285 hdb_master_key *mkey)
288 unsigned char buf[16];
296 filename = HDB_DB_DIR "/m-key";
298 f = fopen(filename, "r");
300 int save_errno = errno;
301 krb5_set_error_string(context, "failed to open %s: %s",
302 filename, strerror(save_errno));
306 if(fread(buf, 1, 2, f) != 2) {
307 krb5_set_error_string(context, "end of file reading %s", filename);
312 fseek(f, 0, SEEK_END);
322 ret = read_master_krb4(context, filename, mkey);
323 } else if(buf[0] == 0x30 && len <= 127 && buf[1] == len - 2) {
324 ret = read_master_encryptionkey(context, filename, mkey);
325 } else if(buf[0] == 5 && buf[1] >= 1 && buf[1] <= 2) {
326 ret = read_master_keytab(context, filename, mkey);
328 ret = read_master_mit(context, filename, mkey);
334 hdb_write_master_key(krb5_context context, const char *filename,
342 filename = HDB_DB_DIR "/m-key";
344 ret = krb5_kt_resolve(context, filename, &kt);
348 for(p = mkey; p; p = p->next) {
349 ret = krb5_kt_add_entry(context, kt, &p->keytab);
352 krb5_kt_close(context, kt);
357 static hdb_master_key
358 find_master_key(Key *key, hdb_master_key mkey)
360 hdb_master_key ret = NULL;
362 if(ret == NULL && mkey->keytab.vno == 0)
364 if(key->mkvno == NULL) {
365 if(ret == NULL || mkey->keytab.vno > ret->keytab.vno)
367 } else if(mkey->keytab.vno == *key->mkvno)
375 hdb_unseal_keys_mkey(krb5_context context, hdb_entry *ent, hdb_master_key mkey)
383 for(i = 0; i < ent->keys.len; i++){
386 k = &ent->keys.val[i];
390 key = find_master_key(&ent->keys.val[i], mkey);
393 return HDB_ERR_NO_MKEY;
395 ret = krb5_decrypt(context, key->crypto, HDB_KU_MKEY,
396 k->key.keyvalue.data,
397 k->key.keyvalue.length,
402 /* fixup keylength if the key got padded when encrypting it */
403 ret = krb5_enctype_keysize(context, k->key.keytype, &keysize);
405 krb5_data_free(&res);
408 if (keysize > res.length) {
409 krb5_data_free(&res);
410 return KRB5_BAD_KEYSIZE;
413 memset(k->key.keyvalue.data, 0, k->key.keyvalue.length);
414 free(k->key.keyvalue.data);
415 k->key.keyvalue = res;
416 k->key.keyvalue.length = keysize;
424 hdb_unseal_keys(krb5_context context, HDB *db, hdb_entry *ent)
426 if (db->master_key_set == 0)
428 return hdb_unseal_keys_mkey(context, ent, db->master_key);
432 hdb_seal_keys_mkey(krb5_context context, hdb_entry *ent, hdb_master_key mkey)
437 for(i = 0; i < ent->keys.len; i++){
438 Key *k = &ent->keys.val[i];
444 key = find_master_key(k, mkey);
447 return HDB_ERR_NO_MKEY;
449 ret = krb5_encrypt(context, key->crypto, HDB_KU_MKEY,
450 k->key.keyvalue.data,
451 k->key.keyvalue.length,
456 memset(k->key.keyvalue.data, 0, k->key.keyvalue.length);
457 free(k->key.keyvalue.data);
458 k->key.keyvalue = res;
460 k->mkvno = malloc(sizeof(*k->mkvno));
461 if (k->mkvno == NULL)
463 *k->mkvno = key->keytab.vno;
469 hdb_seal_keys(krb5_context context, HDB *db, hdb_entry *ent)
471 if (db->master_key_set == 0)
474 return hdb_seal_keys_mkey(context, ent, db->master_key);
478 hdb_set_master_key (krb5_context context,
485 ret = hdb_process_master_key(context, 0, key, 0, &mkey);
488 db->master_key = mkey;
489 #if 0 /* XXX - why? */
490 des_set_random_generator_seed(key.keyvalue.data);
492 db->master_key_set = 1;
497 hdb_set_master_keyfile (krb5_context context,
504 ret = hdb_read_master_key(context, keyfile, &key);
508 krb5_clear_error_string(context);
511 db->master_key = key;
512 db->master_key_set = 1;
517 hdb_clear_master_key (krb5_context context,
520 if (db->master_key_set) {
521 hdb_free_master_key(context, db->master_key);
522 db->master_key_set = 0;