2 * Copyright (c) 2000 - 2004 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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39 struct hdb_master_key_data {
40 krb5_keytab_entry keytab;
42 struct hdb_master_key_data *next;
46 hdb_free_master_key(krb5_context context, hdb_master_key mkey)
48 struct hdb_master_key_data *ptr;
50 krb5_kt_free_entry(context, &mkey->keytab);
52 krb5_crypto_destroy(context, mkey->crypto);
60 hdb_process_master_key(krb5_context context,
61 int kvno, krb5_keyblock *key, krb5_enctype etype,
66 *mkey = calloc(1, sizeof(**mkey));
68 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
71 (*mkey)->keytab.vno = kvno;
72 ret = krb5_parse_name(context, "K/M", &(*mkey)->keytab.principal);
75 ret = krb5_copy_keyblock_contents(context, key, &(*mkey)->keytab.keyblock);
79 (*mkey)->keytab.keyblock.keytype = etype;
80 (*mkey)->keytab.timestamp = time(NULL);
81 ret = krb5_crypto_init(context, key, etype, &(*mkey)->crypto);
86 hdb_free_master_key(context, *mkey);
92 hdb_add_master_key(krb5_context context, krb5_keyblock *key,
93 hdb_master_key *inout)
99 for(p = *inout; p; p = p->next)
100 vno = max(vno, p->keytab.vno);
102 ret = hdb_process_master_key(context, vno, key, 0, &p);
110 static krb5_error_code
111 read_master_keytab(krb5_context context, const char *filename,
112 hdb_master_key *mkey)
116 krb5_kt_cursor cursor;
117 krb5_keytab_entry entry;
120 ret = krb5_kt_resolve(context, filename, &id);
124 ret = krb5_kt_start_seq_get(context, id, &cursor);
128 while(krb5_kt_next_entry(context, id, &entry, &cursor) == 0) {
129 p = calloc(1, sizeof(*p));
131 krb5_kt_end_seq_get(context, id, &cursor);
136 ret = krb5_crypto_init(context, &p->keytab.keyblock, 0, &p->crypto);
140 krb5_kt_end_seq_get(context, id, &cursor);
142 krb5_kt_close(context, id);
146 /* read a MIT master keyfile */
147 static krb5_error_code
148 read_master_mit(krb5_context context, const char *filename,
149 int byteorder, hdb_master_key *mkey)
157 fd = open(filename, O_RDONLY | O_BINARY);
159 int save_errno = errno;
160 krb5_set_error_message(context, save_errno, "failed to open %s: %s",
161 filename, strerror(save_errno));
164 sp = krb5_storage_from_fd(fd);
169 krb5_storage_set_flags(sp, byteorder);
170 /* could possibly use ret_keyblock here, but do it with more
173 ret = krb5_ret_int16(sp, &enctype);
176 ret = krb5_enctype_valid(context, enctype);
179 key.keytype = enctype;
180 ret = krb5_ret_data(sp, &key.keyvalue);
184 ret = hdb_process_master_key(context, 1, &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_message(context, save_errno, "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_message(context, save_errno, "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 == ETYPE_DES_CBC_CRC || 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_message(context, save_errno, "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_message(context, save_errno, "error reading %s: %s",
263 filename, strerror(save_errno));
267 krb5_set_error_message(context, HEIM_ERR_EOF,
268 "bad contents of %s", filename);
269 return HEIM_ERR_EOF; /* XXX file might be too large */
272 memset(&key, 0, sizeof(key));
273 key.keytype = ETYPE_DES_PCBC_NONE;
274 ret = krb5_data_copy(&key.keyvalue, buf, len);
275 memset(buf, 0, sizeof(buf));
279 ret = hdb_process_master_key(context, 0, &key, 0, mkey);
280 krb5_free_keyblock_contents(context, &key);
285 hdb_read_master_key(krb5_context context, const char *filename,
286 hdb_master_key *mkey)
289 unsigned char buf[16];
297 filename = HDB_DB_DIR "/m-key";
299 f = fopen(filename, "r");
301 int save_errno = errno;
302 krb5_set_error_message(context, save_errno, "failed to open %s: %s",
303 filename, strerror(save_errno));
307 if(fread(buf, 1, 2, f) != 2) {
309 krb5_set_error_message(context, HEIM_ERR_EOF, "end of file reading %s", filename);
313 fseek(f, 0, SEEK_END);
323 ret = read_master_krb4(context, filename, mkey);
324 } else if(buf[0] == 0x30 && len <= 127 && buf[1] == len - 2) {
325 ret = read_master_encryptionkey(context, filename, mkey);
326 } else if(buf[0] == 5 && buf[1] >= 1 && buf[1] <= 2) {
327 ret = read_master_keytab(context, filename, mkey);
330 * Check both LittleEndian and BigEndian since they key file
331 * might be moved from a machine with diffrent byte order, or
332 * its running on MacOS X that always uses BE master keys.
334 ret = read_master_mit(context, filename, KRB5_STORAGE_BYTEORDER_LE, mkey);
336 ret = read_master_mit(context, filename, KRB5_STORAGE_BYTEORDER_BE, mkey);
342 hdb_write_master_key(krb5_context context, const char *filename,
350 filename = HDB_DB_DIR "/m-key";
352 ret = krb5_kt_resolve(context, filename, &kt);
356 for(p = mkey; p; p = p->next) {
357 ret = krb5_kt_add_entry(context, kt, &p->keytab);
360 krb5_kt_close(context, kt);
366 _hdb_find_master_key(uint32_t *mkvno, hdb_master_key mkey)
368 hdb_master_key ret = NULL;
370 if(ret == NULL && mkey->keytab.vno == 0)
373 if(ret == NULL || mkey->keytab.vno > ret->keytab.vno)
375 } else if((uint32_t)mkey->keytab.vno == *mkvno)
383 _hdb_mkey_version(hdb_master_key mkey)
385 return mkey->keytab.vno;
389 _hdb_mkey_decrypt(krb5_context context, hdb_master_key key,
390 krb5_key_usage usage,
391 void *ptr, size_t size, krb5_data *res)
393 return krb5_decrypt(context, key->crypto, usage,
398 _hdb_mkey_encrypt(krb5_context context, hdb_master_key key,
399 krb5_key_usage usage,
400 const void *ptr, size_t size, krb5_data *res)
402 return krb5_encrypt(context, key->crypto, usage,
407 hdb_unseal_key_mkey(krb5_context context, Key *k, hdb_master_key mkey)
419 key = _hdb_find_master_key(k->mkvno, mkey);
422 return HDB_ERR_NO_MKEY;
424 ret = _hdb_mkey_decrypt(context, key, HDB_KU_MKEY,
425 k->key.keyvalue.data,
426 k->key.keyvalue.length,
428 if(ret == KRB5KRB_AP_ERR_BAD_INTEGRITY) {
429 /* try to decrypt with MIT key usage */
430 ret = _hdb_mkey_decrypt(context, key, 0,
431 k->key.keyvalue.data,
432 k->key.keyvalue.length,
438 /* fixup keylength if the key got padded when encrypting it */
439 ret = krb5_enctype_keysize(context, k->key.keytype, &keysize);
441 krb5_data_free(&res);
444 if (keysize > res.length) {
445 krb5_data_free(&res);
446 return KRB5_BAD_KEYSIZE;
449 memset(k->key.keyvalue.data, 0, k->key.keyvalue.length);
450 free(k->key.keyvalue.data);
451 k->key.keyvalue = res;
452 k->key.keyvalue.length = keysize;
460 hdb_unseal_keys_mkey(krb5_context context, hdb_entry *ent, hdb_master_key mkey)
464 for(i = 0; i < ent->keys.len; i++){
467 ret = hdb_unseal_key_mkey(context, &ent->keys.val[i], mkey);
475 hdb_unseal_keys(krb5_context context, HDB *db, hdb_entry *ent)
477 if (db->hdb_master_key_set == 0)
479 return hdb_unseal_keys_mkey(context, ent, db->hdb_master_key);
483 hdb_unseal_key(krb5_context context, HDB *db, Key *k)
485 if (db->hdb_master_key_set == 0)
487 return hdb_unseal_key_mkey(context, k, db->hdb_master_key);
491 hdb_seal_key_mkey(krb5_context context, Key *k, hdb_master_key mkey)
500 key = _hdb_find_master_key(k->mkvno, mkey);
503 return HDB_ERR_NO_MKEY;
505 ret = _hdb_mkey_encrypt(context, key, HDB_KU_MKEY,
506 k->key.keyvalue.data,
507 k->key.keyvalue.length,
512 memset(k->key.keyvalue.data, 0, k->key.keyvalue.length);
513 free(k->key.keyvalue.data);
514 k->key.keyvalue = res;
516 if (k->mkvno == NULL) {
517 k->mkvno = malloc(sizeof(*k->mkvno));
518 if (k->mkvno == NULL)
521 *k->mkvno = key->keytab.vno;
527 hdb_seal_keys_mkey(krb5_context context, hdb_entry *ent, hdb_master_key mkey)
530 for(i = 0; i < ent->keys.len; i++){
533 ret = hdb_seal_key_mkey(context, &ent->keys.val[i], mkey);
541 hdb_seal_keys(krb5_context context, HDB *db, hdb_entry *ent)
543 if (db->hdb_master_key_set == 0)
546 return hdb_seal_keys_mkey(context, ent, db->hdb_master_key);
550 hdb_seal_key(krb5_context context, HDB *db, Key *k)
552 if (db->hdb_master_key_set == 0)
555 return hdb_seal_key_mkey(context, k, db->hdb_master_key);
559 hdb_set_master_key (krb5_context context,
566 ret = hdb_process_master_key(context, 0, key, 0, &mkey);
569 db->hdb_master_key = mkey;
570 #if 0 /* XXX - why? */
571 des_set_random_generator_seed(key.keyvalue.data);
573 db->hdb_master_key_set = 1;
578 hdb_set_master_keyfile (krb5_context context,
585 ret = hdb_read_master_key(context, keyfile, &key);
589 krb5_clear_error_message(context);
592 db->hdb_master_key = key;
593 db->hdb_master_key_set = 1;
598 hdb_clear_master_key (krb5_context context,
601 if (db->hdb_master_key_set) {
602 hdb_free_master_key(context, db->hdb_master_key);
603 db->hdb_master_key_set = 0;