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39 RCSID("$Id: mkey.c 21745 2007-07-31 16:11:25Z 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 krb5_kt_end_seq_get(context, id, &cursor);
138 ret = krb5_crypto_init(context, &p->keytab.keyblock, 0, &p->crypto);
142 krb5_kt_end_seq_get(context, id, &cursor);
144 krb5_kt_close(context, id);
148 /* read a MIT master keyfile */
149 static krb5_error_code
150 read_master_mit(krb5_context context, const char *filename,
151 hdb_master_key *mkey)
159 fd = open(filename, O_RDONLY | O_BINARY);
161 int save_errno = errno;
162 krb5_set_error_string(context, "failed to open %s: %s", filename,
163 strerror(save_errno));
166 sp = krb5_storage_from_fd(fd);
171 krb5_storage_set_flags(sp, KRB5_STORAGE_HOST_BYTEORDER);
173 /* could possibly use ret_keyblock here, but do it with more
175 ret = krb5_ret_keyblock(sp, &key);
177 ret = krb5_ret_int16(sp, &enctype);
178 if((htons(enctype) & 0xff00) == 0x3000) {
179 krb5_set_error_string(context, "unknown keytype in %s: %#x, expected %#x",
180 filename, htons(enctype), 0x3000);
181 ret = HEIM_ERR_BAD_MKEY;
184 key.keytype = enctype;
185 ret = krb5_ret_data(sp, &key.keyvalue);
189 ret = hdb_process_master_key(context, 0, &key, 0, mkey);
190 krb5_free_keyblock_contents(context, &key);
192 krb5_storage_free(sp);
197 /* read an old master key file */
198 static krb5_error_code
199 read_master_encryptionkey(krb5_context context, const char *filename,
200 hdb_master_key *mkey)
205 unsigned char buf[256];
209 fd = open(filename, O_RDONLY | O_BINARY);
211 int save_errno = errno;
212 krb5_set_error_string(context, "failed to open %s: %s",
213 filename, strerror(save_errno));
217 len = read(fd, buf, sizeof(buf));
220 int save_errno = errno;
221 krb5_set_error_string(context, "error reading %s: %s",
222 filename, strerror(save_errno));
226 ret = decode_EncryptionKey(buf, len, &key, &ret_len);
227 memset(buf, 0, sizeof(buf));
231 /* Originally, the keytype was just that, and later it got changed
232 to des-cbc-md5, but we always used des in cfb64 mode. This
233 should cover all cases, but will break if someone has hacked
234 this code to really use des-cbc-md5 -- but then that's not my
236 if(key.keytype == KEYTYPE_DES || key.keytype == ETYPE_DES_CBC_MD5)
237 key.keytype = ETYPE_DES_CFB64_NONE;
239 ret = hdb_process_master_key(context, 0, &key, 0, mkey);
240 krb5_free_keyblock_contents(context, &key);
244 /* read a krb4 /.k style file */
245 static krb5_error_code
246 read_master_krb4(krb5_context context, const char *filename,
247 hdb_master_key *mkey)
252 unsigned char buf[256];
255 fd = open(filename, O_RDONLY | O_BINARY);
257 int save_errno = errno;
258 krb5_set_error_string(context, "failed to open %s: %s",
259 filename, strerror(save_errno));
263 len = read(fd, buf, sizeof(buf));
266 int save_errno = errno;
267 krb5_set_error_string(context, "error reading %s: %s",
268 filename, strerror(save_errno));
272 krb5_set_error_string(context, "bad contents of %s", filename);
273 return HEIM_ERR_EOF; /* XXX file might be too large */
276 memset(&key, 0, sizeof(key));
277 key.keytype = ETYPE_DES_PCBC_NONE;
278 ret = krb5_data_copy(&key.keyvalue, buf, len);
279 memset(buf, 0, sizeof(buf));
283 ret = hdb_process_master_key(context, 0, &key, 0, mkey);
284 krb5_free_keyblock_contents(context, &key);
289 hdb_read_master_key(krb5_context context, const char *filename,
290 hdb_master_key *mkey)
293 unsigned char buf[16];
301 filename = HDB_DB_DIR "/m-key";
303 f = fopen(filename, "r");
305 int save_errno = errno;
306 krb5_set_error_string(context, "failed to open %s: %s",
307 filename, strerror(save_errno));
311 if(fread(buf, 1, 2, f) != 2) {
312 krb5_set_error_string(context, "end of file reading %s", filename);
317 fseek(f, 0, SEEK_END);
327 ret = read_master_krb4(context, filename, mkey);
328 } else if(buf[0] == 0x30 && len <= 127 && buf[1] == len - 2) {
329 ret = read_master_encryptionkey(context, filename, mkey);
330 } else if(buf[0] == 5 && buf[1] >= 1 && buf[1] <= 2) {
331 ret = read_master_keytab(context, filename, mkey);
333 ret = read_master_mit(context, filename, mkey);
339 hdb_write_master_key(krb5_context context, const char *filename,
347 filename = HDB_DB_DIR "/m-key";
349 ret = krb5_kt_resolve(context, filename, &kt);
353 for(p = mkey; p; p = p->next) {
354 ret = krb5_kt_add_entry(context, kt, &p->keytab);
357 krb5_kt_close(context, kt);
363 _hdb_find_master_key(uint32_t *mkvno, hdb_master_key mkey)
365 hdb_master_key ret = NULL;
367 if(ret == NULL && mkey->keytab.vno == 0)
370 if(ret == NULL || mkey->keytab.vno > ret->keytab.vno)
372 } else if(mkey->keytab.vno == *mkvno)
380 _hdb_mkey_version(hdb_master_key mkey)
382 return mkey->keytab.vno;
386 _hdb_mkey_decrypt(krb5_context context, hdb_master_key key,
387 krb5_key_usage usage,
388 void *ptr, size_t size, krb5_data *res)
390 return krb5_decrypt(context, key->crypto, usage,
395 _hdb_mkey_encrypt(krb5_context context, hdb_master_key key,
396 krb5_key_usage usage,
397 const void *ptr, size_t size, krb5_data *res)
399 return krb5_encrypt(context, key->crypto, usage,
404 hdb_unseal_key_mkey(krb5_context context, Key *k, hdb_master_key mkey)
416 key = _hdb_find_master_key(k->mkvno, mkey);
419 return HDB_ERR_NO_MKEY;
421 ret = _hdb_mkey_decrypt(context, key, HDB_KU_MKEY,
422 k->key.keyvalue.data,
423 k->key.keyvalue.length,
425 if(ret == KRB5KRB_AP_ERR_BAD_INTEGRITY) {
426 /* try to decrypt with MIT key usage */
427 ret = _hdb_mkey_decrypt(context, key, 0,
428 k->key.keyvalue.data,
429 k->key.keyvalue.length,
435 /* fixup keylength if the key got padded when encrypting it */
436 ret = krb5_enctype_keysize(context, k->key.keytype, &keysize);
438 krb5_data_free(&res);
441 if (keysize > res.length) {
442 krb5_data_free(&res);
443 return KRB5_BAD_KEYSIZE;
446 memset(k->key.keyvalue.data, 0, k->key.keyvalue.length);
447 free(k->key.keyvalue.data);
448 k->key.keyvalue = res;
449 k->key.keyvalue.length = keysize;
457 hdb_unseal_keys_mkey(krb5_context context, hdb_entry *ent, hdb_master_key mkey)
461 for(i = 0; i < ent->keys.len; i++){
464 ret = hdb_unseal_key_mkey(context, &ent->keys.val[i], mkey);
472 hdb_unseal_keys(krb5_context context, HDB *db, hdb_entry *ent)
474 if (db->hdb_master_key_set == 0)
476 return hdb_unseal_keys_mkey(context, ent, db->hdb_master_key);
480 hdb_unseal_key(krb5_context context, HDB *db, Key *k)
482 if (db->hdb_master_key_set == 0)
484 return hdb_unseal_key_mkey(context, k, db->hdb_master_key);
488 hdb_seal_key_mkey(krb5_context context, Key *k, hdb_master_key mkey)
497 key = _hdb_find_master_key(k->mkvno, mkey);
500 return HDB_ERR_NO_MKEY;
502 ret = _hdb_mkey_encrypt(context, key, HDB_KU_MKEY,
503 k->key.keyvalue.data,
504 k->key.keyvalue.length,
509 memset(k->key.keyvalue.data, 0, k->key.keyvalue.length);
510 free(k->key.keyvalue.data);
511 k->key.keyvalue = res;
513 if (k->mkvno == NULL) {
514 k->mkvno = malloc(sizeof(*k->mkvno));
515 if (k->mkvno == NULL)
518 *k->mkvno = key->keytab.vno;
524 hdb_seal_keys_mkey(krb5_context context, hdb_entry *ent, hdb_master_key mkey)
527 for(i = 0; i < ent->keys.len; i++){
530 ret = hdb_seal_key_mkey(context, &ent->keys.val[i], mkey);
538 hdb_seal_keys(krb5_context context, HDB *db, hdb_entry *ent)
540 if (db->hdb_master_key_set == 0)
543 return hdb_seal_keys_mkey(context, ent, db->hdb_master_key);
547 hdb_seal_key(krb5_context context, HDB *db, Key *k)
549 if (db->hdb_master_key_set == 0)
552 return hdb_seal_key_mkey(context, k, db->hdb_master_key);
556 hdb_set_master_key (krb5_context context,
563 ret = hdb_process_master_key(context, 0, key, 0, &mkey);
566 db->hdb_master_key = mkey;
567 #if 0 /* XXX - why? */
568 des_set_random_generator_seed(key.keyvalue.data);
570 db->hdb_master_key_set = 1;
575 hdb_set_master_keyfile (krb5_context context,
582 ret = hdb_read_master_key(context, keyfile, &key);
586 krb5_clear_error_string(context);
589 db->hdb_master_key = key;
590 db->hdb_master_key_set = 1;
595 hdb_clear_master_key (krb5_context context,
598 if (db->hdb_master_key_set) {
599 hdb_free_master_key(context, db->hdb_master_key);
600 db->hdb_master_key_set = 0;