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39 RCSID("$Id: mkey.c 17445 2006-05-05 10:37:46Z lha $");
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);
358 _hdb_find_master_key(uint32_t *mkvno, hdb_master_key mkey)
360 hdb_master_key ret = NULL;
362 if(ret == NULL && mkey->keytab.vno == 0)
365 if(ret == NULL || mkey->keytab.vno > ret->keytab.vno)
367 } else if(mkey->keytab.vno == *mkvno)
375 _hdb_mkey_version(hdb_master_key mkey)
377 return mkey->keytab.vno;
381 _hdb_mkey_decrypt(krb5_context context, hdb_master_key key,
382 krb5_key_usage usage,
383 void *ptr, size_t size, krb5_data *res)
385 return krb5_decrypt(context, key->crypto, usage,
390 _hdb_mkey_encrypt(krb5_context context, hdb_master_key key,
391 krb5_key_usage usage,
392 const void *ptr, size_t size, krb5_data *res)
394 return krb5_encrypt(context, key->crypto, usage,
399 hdb_unseal_key_mkey(krb5_context context, Key *k, hdb_master_key mkey)
411 key = _hdb_find_master_key(k->mkvno, mkey);
414 return HDB_ERR_NO_MKEY;
416 ret = _hdb_mkey_decrypt(context, key, HDB_KU_MKEY,
417 k->key.keyvalue.data,
418 k->key.keyvalue.length,
420 if(ret == KRB5KRB_AP_ERR_BAD_INTEGRITY) {
421 /* try to decrypt with MIT key usage */
422 ret = _hdb_mkey_decrypt(context, key, 0,
423 k->key.keyvalue.data,
424 k->key.keyvalue.length,
430 /* fixup keylength if the key got padded when encrypting it */
431 ret = krb5_enctype_keysize(context, k->key.keytype, &keysize);
433 krb5_data_free(&res);
436 if (keysize > res.length) {
437 krb5_data_free(&res);
438 return KRB5_BAD_KEYSIZE;
441 memset(k->key.keyvalue.data, 0, k->key.keyvalue.length);
442 free(k->key.keyvalue.data);
443 k->key.keyvalue = res;
444 k->key.keyvalue.length = keysize;
452 hdb_unseal_keys_mkey(krb5_context context, hdb_entry *ent, hdb_master_key mkey)
456 for(i = 0; i < ent->keys.len; i++){
459 ret = hdb_unseal_key_mkey(context, &ent->keys.val[i], mkey);
467 hdb_unseal_keys(krb5_context context, HDB *db, hdb_entry *ent)
469 if (db->hdb_master_key_set == 0)
471 return hdb_unseal_keys_mkey(context, ent, db->hdb_master_key);
475 hdb_unseal_key(krb5_context context, HDB *db, Key *k)
477 if (db->hdb_master_key_set == 0)
479 return hdb_unseal_key_mkey(context, k, db->hdb_master_key);
483 hdb_seal_key_mkey(krb5_context context, Key *k, hdb_master_key mkey)
492 key = _hdb_find_master_key(k->mkvno, mkey);
495 return HDB_ERR_NO_MKEY;
497 ret = _hdb_mkey_encrypt(context, key, HDB_KU_MKEY,
498 k->key.keyvalue.data,
499 k->key.keyvalue.length,
504 memset(k->key.keyvalue.data, 0, k->key.keyvalue.length);
505 free(k->key.keyvalue.data);
506 k->key.keyvalue = res;
508 if (k->mkvno == NULL) {
509 k->mkvno = malloc(sizeof(*k->mkvno));
510 if (k->mkvno == NULL)
513 *k->mkvno = key->keytab.vno;
519 hdb_seal_keys_mkey(krb5_context context, hdb_entry *ent, hdb_master_key mkey)
522 for(i = 0; i < ent->keys.len; i++){
525 ret = hdb_seal_key_mkey(context, &ent->keys.val[i], mkey);
533 hdb_seal_keys(krb5_context context, HDB *db, hdb_entry *ent)
535 if (db->hdb_master_key_set == 0)
538 return hdb_seal_keys_mkey(context, ent, db->hdb_master_key);
542 hdb_seal_key(krb5_context context, HDB *db, Key *k)
544 if (db->hdb_master_key_set == 0)
547 return hdb_seal_key_mkey(context, k, db->hdb_master_key);
551 hdb_set_master_key (krb5_context context,
558 ret = hdb_process_master_key(context, 0, key, 0, &mkey);
561 db->hdb_master_key = mkey;
562 #if 0 /* XXX - why? */
563 des_set_random_generator_seed(key.keyvalue.data);
565 db->hdb_master_key_set = 1;
570 hdb_set_master_keyfile (krb5_context context,
577 ret = hdb_read_master_key(context, keyfile, &key);
581 krb5_clear_error_string(context);
584 db->hdb_master_key = key;
585 db->hdb_master_key_set = 1;
590 hdb_clear_master_key (krb5_context context,
593 if (db->hdb_master_key_set) {
594 hdb_free_master_key(context, db->hdb_master_key);
595 db->hdb_master_key_set = 0;