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keymgmt_lib.c 19 KB

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  1. /*
  2. * Copyright 2019-2023 The OpenSSL Project Authors. All Rights Reserved.
  3. *
  4. * Licensed under the Apache License 2.0 (the "License"). You may not use
  5. * this file except in compliance with the License. You can obtain a copy
  6. * in the file LICENSE in the source distribution or at
  7. * https://www.openssl.org/source/license.html
  8. */
  9. #include <openssl/core_names.h>
  10. #include "internal/cryptlib.h"
  11. #include "internal/nelem.h"
  12. #include "crypto/evp.h"
  13. #include "internal/core.h"
  14. #include "internal/provider.h"
  15. #include "evp_local.h"
  16. /*
  17. * match_type() checks if two EVP_KEYMGMT are matching key types. This
  18. * function assumes that the caller has made all the necessary NULL checks.
  19. */
  20. static int match_type(const EVP_KEYMGMT *keymgmt1, const EVP_KEYMGMT *keymgmt2)
  21. {
  22. const char *name2 = EVP_KEYMGMT_get0_name(keymgmt2);
  23. return EVP_KEYMGMT_is_a(keymgmt1, name2);
  24. }
  25. int evp_keymgmt_util_try_import(const OSSL_PARAM params[], void *arg)
  26. {
  27. struct evp_keymgmt_util_try_import_data_st *data = arg;
  28. int delete_on_error = 0;
  29. /* Just in time creation of keydata */
  30. if (data->keydata == NULL) {
  31. if ((data->keydata = evp_keymgmt_newdata(data->keymgmt)) == NULL) {
  32. ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
  33. return 0;
  34. }
  35. delete_on_error = 1;
  36. }
  37. /*
  38. * It's fine if there was no data to transfer, we just end up with an
  39. * empty destination key.
  40. */
  41. if (params[0].key == NULL)
  42. return 1;
  43. if (evp_keymgmt_import(data->keymgmt, data->keydata, data->selection,
  44. params))
  45. return 1;
  46. if (delete_on_error) {
  47. evp_keymgmt_freedata(data->keymgmt, data->keydata);
  48. data->keydata = NULL;
  49. }
  50. return 0;
  51. }
  52. int evp_keymgmt_util_assign_pkey(EVP_PKEY *pkey, EVP_KEYMGMT *keymgmt,
  53. void *keydata)
  54. {
  55. if (pkey == NULL || keymgmt == NULL || keydata == NULL
  56. || !EVP_PKEY_set_type_by_keymgmt(pkey, keymgmt)) {
  57. ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
  58. return 0;
  59. }
  60. pkey->keydata = keydata;
  61. evp_keymgmt_util_cache_keyinfo(pkey);
  62. return 1;
  63. }
  64. EVP_PKEY *evp_keymgmt_util_make_pkey(EVP_KEYMGMT *keymgmt, void *keydata)
  65. {
  66. EVP_PKEY *pkey = NULL;
  67. if (keymgmt == NULL
  68. || keydata == NULL
  69. || (pkey = EVP_PKEY_new()) == NULL
  70. || !evp_keymgmt_util_assign_pkey(pkey, keymgmt, keydata)) {
  71. EVP_PKEY_free(pkey);
  72. return NULL;
  73. }
  74. return pkey;
  75. }
  76. int evp_keymgmt_util_export(const EVP_PKEY *pk, int selection,
  77. OSSL_CALLBACK *export_cb, void *export_cbarg)
  78. {
  79. if (pk == NULL || export_cb == NULL)
  80. return 0;
  81. return evp_keymgmt_export(pk->keymgmt, pk->keydata, selection,
  82. export_cb, export_cbarg);
  83. }
  84. void *evp_keymgmt_util_export_to_provider(EVP_PKEY *pk, EVP_KEYMGMT *keymgmt,
  85. int selection)
  86. {
  87. struct evp_keymgmt_util_try_import_data_st import_data;
  88. OP_CACHE_ELEM *op;
  89. /* Export to where? */
  90. if (keymgmt == NULL)
  91. return NULL;
  92. /* If we have an unassigned key, give up */
  93. if (pk->keydata == NULL)
  94. return NULL;
  95. /*
  96. * If |keymgmt| matches the "origin" |keymgmt|, there is no more to do.
  97. * The "origin" is determined by the |keymgmt| pointers being identical
  98. * or when the provider and the name ID match. The latter case handles the
  99. * situation where the fetch cache is flushed and a "new" key manager is
  100. * created.
  101. */
  102. if (pk->keymgmt == keymgmt
  103. || (pk->keymgmt->name_id == keymgmt->name_id
  104. && pk->keymgmt->prov == keymgmt->prov))
  105. return pk->keydata;
  106. if (!CRYPTO_THREAD_read_lock(pk->lock))
  107. return NULL;
  108. /*
  109. * If the provider native "origin" hasn't changed since last time, we
  110. * try to find our keymgmt in the operation cache. If it has changed
  111. * and our keymgmt isn't found, we will clear the cache further down.
  112. */
  113. if (pk->dirty_cnt == pk->dirty_cnt_copy) {
  114. /* If this key is already exported to |keymgmt|, no more to do */
  115. op = evp_keymgmt_util_find_operation_cache(pk, keymgmt, selection);
  116. if (op != NULL && op->keymgmt != NULL) {
  117. void *ret = op->keydata;
  118. CRYPTO_THREAD_unlock(pk->lock);
  119. return ret;
  120. }
  121. }
  122. CRYPTO_THREAD_unlock(pk->lock);
  123. /* If the "origin" |keymgmt| doesn't support exporting, give up */
  124. if (pk->keymgmt->export == NULL)
  125. return NULL;
  126. /*
  127. * Make sure that the type of the keymgmt to export to matches the type
  128. * of the "origin"
  129. */
  130. if (!ossl_assert(match_type(pk->keymgmt, keymgmt)))
  131. return NULL;
  132. /*
  133. * We look at the already cached provider keys, and import from the
  134. * first that supports it (i.e. use its export function), and export
  135. * the imported data to the new provider.
  136. */
  137. /* Setup for the export callback */
  138. import_data.keydata = NULL; /* evp_keymgmt_util_try_import will create it */
  139. import_data.keymgmt = keymgmt;
  140. import_data.selection = selection;
  141. /*
  142. * The export function calls the callback (evp_keymgmt_util_try_import),
  143. * which does the import for us. If successful, we're done.
  144. */
  145. if (!evp_keymgmt_util_export(pk, selection,
  146. &evp_keymgmt_util_try_import, &import_data))
  147. /* If there was an error, bail out */
  148. return NULL;
  149. if (!CRYPTO_THREAD_write_lock(pk->lock)) {
  150. evp_keymgmt_freedata(keymgmt, import_data.keydata);
  151. return NULL;
  152. }
  153. /* Check to make sure some other thread didn't get there first */
  154. op = evp_keymgmt_util_find_operation_cache(pk, keymgmt, selection);
  155. if (op != NULL && op->keydata != NULL) {
  156. void *ret = op->keydata;
  157. CRYPTO_THREAD_unlock(pk->lock);
  158. /*
  159. * Another thread seemms to have already exported this so we abandon
  160. * all the work we just did.
  161. */
  162. evp_keymgmt_freedata(keymgmt, import_data.keydata);
  163. return ret;
  164. }
  165. /*
  166. * If the dirty counter changed since last time, then clear the
  167. * operation cache. In that case, we know that |i| is zero.
  168. */
  169. if (pk->dirty_cnt != pk->dirty_cnt_copy)
  170. evp_keymgmt_util_clear_operation_cache(pk);
  171. /* Add the new export to the operation cache */
  172. if (!evp_keymgmt_util_cache_keydata(pk, keymgmt, import_data.keydata,
  173. selection)) {
  174. CRYPTO_THREAD_unlock(pk->lock);
  175. evp_keymgmt_freedata(keymgmt, import_data.keydata);
  176. return NULL;
  177. }
  178. /* Synchronize the dirty count */
  179. pk->dirty_cnt_copy = pk->dirty_cnt;
  180. CRYPTO_THREAD_unlock(pk->lock);
  181. return import_data.keydata;
  182. }
  183. static void op_cache_free(OP_CACHE_ELEM *e)
  184. {
  185. evp_keymgmt_freedata(e->keymgmt, e->keydata);
  186. EVP_KEYMGMT_free(e->keymgmt);
  187. OPENSSL_free(e);
  188. }
  189. int evp_keymgmt_util_clear_operation_cache(EVP_PKEY *pk)
  190. {
  191. if (pk != NULL) {
  192. sk_OP_CACHE_ELEM_pop_free(pk->operation_cache, op_cache_free);
  193. pk->operation_cache = NULL;
  194. }
  195. return 1;
  196. }
  197. OP_CACHE_ELEM *evp_keymgmt_util_find_operation_cache(EVP_PKEY *pk,
  198. EVP_KEYMGMT *keymgmt,
  199. int selection)
  200. {
  201. int i, end = sk_OP_CACHE_ELEM_num(pk->operation_cache);
  202. OP_CACHE_ELEM *p;
  203. /*
  204. * A comparison and sk_P_CACHE_ELEM_find() are avoided to not cause
  205. * problems when we've only a read lock.
  206. */
  207. for (i = 0; i < end; i++) {
  208. p = sk_OP_CACHE_ELEM_value(pk->operation_cache, i);
  209. if (keymgmt == p->keymgmt && (p->selection & selection) == selection)
  210. return p;
  211. }
  212. return NULL;
  213. }
  214. int evp_keymgmt_util_cache_keydata(EVP_PKEY *pk, EVP_KEYMGMT *keymgmt,
  215. void *keydata, int selection)
  216. {
  217. OP_CACHE_ELEM *p = NULL;
  218. if (keydata != NULL) {
  219. if (pk->operation_cache == NULL) {
  220. pk->operation_cache = sk_OP_CACHE_ELEM_new_null();
  221. if (pk->operation_cache == NULL)
  222. return 0;
  223. }
  224. p = OPENSSL_malloc(sizeof(*p));
  225. if (p == NULL)
  226. return 0;
  227. p->keydata = keydata;
  228. p->keymgmt = keymgmt;
  229. p->selection = selection;
  230. if (!EVP_KEYMGMT_up_ref(keymgmt)) {
  231. OPENSSL_free(p);
  232. return 0;
  233. }
  234. if (!sk_OP_CACHE_ELEM_push(pk->operation_cache, p)) {
  235. EVP_KEYMGMT_free(keymgmt);
  236. OPENSSL_free(p);
  237. return 0;
  238. }
  239. }
  240. return 1;
  241. }
  242. void evp_keymgmt_util_cache_keyinfo(EVP_PKEY *pk)
  243. {
  244. /*
  245. * Cache information about the provider "origin" key.
  246. *
  247. * This services functions like EVP_PKEY_get_size, EVP_PKEY_get_bits, etc
  248. */
  249. if (pk->keydata != NULL) {
  250. int bits = 0;
  251. int security_bits = 0;
  252. int size = 0;
  253. OSSL_PARAM params[4];
  254. params[0] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_BITS, &bits);
  255. params[1] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_SECURITY_BITS,
  256. &security_bits);
  257. params[2] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_MAX_SIZE, &size);
  258. params[3] = OSSL_PARAM_construct_end();
  259. if (evp_keymgmt_get_params(pk->keymgmt, pk->keydata, params)) {
  260. pk->cache.size = size;
  261. pk->cache.bits = bits;
  262. pk->cache.security_bits = security_bits;
  263. }
  264. }
  265. }
  266. void *evp_keymgmt_util_fromdata(EVP_PKEY *target, EVP_KEYMGMT *keymgmt,
  267. int selection, const OSSL_PARAM params[])
  268. {
  269. void *keydata = NULL;
  270. if ((keydata = evp_keymgmt_newdata(keymgmt)) == NULL
  271. || !evp_keymgmt_import(keymgmt, keydata, selection, params)
  272. || !evp_keymgmt_util_assign_pkey(target, keymgmt, keydata)) {
  273. evp_keymgmt_freedata(keymgmt, keydata);
  274. keydata = NULL;
  275. }
  276. return keydata;
  277. }
  278. int evp_keymgmt_util_has(EVP_PKEY *pk, int selection)
  279. {
  280. /* Check if key is even assigned */
  281. if (pk->keymgmt == NULL)
  282. return 0;
  283. return evp_keymgmt_has(pk->keymgmt, pk->keydata, selection);
  284. }
  285. /*
  286. * evp_keymgmt_util_match() doesn't just look at the provider side "origin",
  287. * but also in the operation cache to see if there's any common keymgmt that
  288. * supplies OP_keymgmt_match.
  289. *
  290. * evp_keymgmt_util_match() adheres to the return values that EVP_PKEY_eq()
  291. * and EVP_PKEY_parameters_eq() return, i.e.:
  292. *
  293. * 1 same key
  294. * 0 not same key
  295. * -1 not same key type
  296. * -2 unsupported operation
  297. */
  298. int evp_keymgmt_util_match(EVP_PKEY *pk1, EVP_PKEY *pk2, int selection)
  299. {
  300. EVP_KEYMGMT *keymgmt1 = NULL, *keymgmt2 = NULL;
  301. void *keydata1 = NULL, *keydata2 = NULL;
  302. if (pk1 == NULL || pk2 == NULL) {
  303. if (pk1 == NULL && pk2 == NULL)
  304. return 1;
  305. return 0;
  306. }
  307. keymgmt1 = pk1->keymgmt;
  308. keydata1 = pk1->keydata;
  309. keymgmt2 = pk2->keymgmt;
  310. keydata2 = pk2->keydata;
  311. if (keymgmt1 != keymgmt2) {
  312. /*
  313. * The condition for a successful cross export is that the
  314. * keydata to be exported is NULL (typed, but otherwise empty
  315. * EVP_PKEY), or that it was possible to export it with
  316. * evp_keymgmt_util_export_to_provider().
  317. *
  318. * We use |ok| to determine if it's ok to cross export one way,
  319. * but also to determine if we should attempt a cross export
  320. * the other way. There's no point doing it both ways.
  321. */
  322. int ok = 0;
  323. /* Complex case, where the keymgmt differ */
  324. if (keymgmt1 != NULL
  325. && keymgmt2 != NULL
  326. && !match_type(keymgmt1, keymgmt2)) {
  327. ERR_raise(ERR_LIB_EVP, EVP_R_DIFFERENT_KEY_TYPES);
  328. return -1; /* Not the same type */
  329. }
  330. /*
  331. * The key types are determined to match, so we try cross export,
  332. * but only to keymgmt's that supply a matching function.
  333. */
  334. if (keymgmt2 != NULL
  335. && keymgmt2->match != NULL) {
  336. void *tmp_keydata = NULL;
  337. ok = 1;
  338. if (keydata1 != NULL) {
  339. tmp_keydata =
  340. evp_keymgmt_util_export_to_provider(pk1, keymgmt2,
  341. selection);
  342. ok = (tmp_keydata != NULL);
  343. }
  344. if (ok) {
  345. keymgmt1 = keymgmt2;
  346. keydata1 = tmp_keydata;
  347. }
  348. }
  349. /*
  350. * If we've successfully cross exported one way, there's no point
  351. * doing it the other way, hence the |!ok| check.
  352. */
  353. if (!ok
  354. && keymgmt1 != NULL
  355. && keymgmt1->match != NULL) {
  356. void *tmp_keydata = NULL;
  357. ok = 1;
  358. if (keydata2 != NULL) {
  359. tmp_keydata =
  360. evp_keymgmt_util_export_to_provider(pk2, keymgmt1,
  361. selection);
  362. ok = (tmp_keydata != NULL);
  363. }
  364. if (ok) {
  365. keymgmt2 = keymgmt1;
  366. keydata2 = tmp_keydata;
  367. }
  368. }
  369. }
  370. /* If we still don't have matching keymgmt implementations, we give up */
  371. if (keymgmt1 != keymgmt2)
  372. return -2;
  373. /* If both keydata are NULL, then they're the same key */
  374. if (keydata1 == NULL && keydata2 == NULL)
  375. return 1;
  376. /* If only one of the keydata is NULL, then they're different keys */
  377. if (keydata1 == NULL || keydata2 == NULL)
  378. return 0;
  379. /* If both keydata are non-NULL, we let the backend decide */
  380. return evp_keymgmt_match(keymgmt1, keydata1, keydata2, selection);
  381. }
  382. int evp_keymgmt_util_copy(EVP_PKEY *to, EVP_PKEY *from, int selection)
  383. {
  384. /* Save copies of pointers we want to play with without affecting |to| */
  385. EVP_KEYMGMT *to_keymgmt = to->keymgmt;
  386. void *to_keydata = to->keydata, *alloc_keydata = NULL;
  387. /* An unassigned key can't be copied */
  388. if (from == NULL || from->keydata == NULL)
  389. return 0;
  390. /*
  391. * If |to| is unassigned, ensure it gets the same KEYMGMT as |from|,
  392. * Note that the final setting of KEYMGMT is done further down, with
  393. * EVP_PKEY_set_type_by_keymgmt(); we don't want to do that prematurely.
  394. */
  395. if (to_keymgmt == NULL)
  396. to_keymgmt = from->keymgmt;
  397. if (to_keymgmt == from->keymgmt && to_keymgmt->dup != NULL
  398. && to_keydata == NULL) {
  399. to_keydata = alloc_keydata = evp_keymgmt_dup(to_keymgmt,
  400. from->keydata,
  401. selection);
  402. if (to_keydata == NULL)
  403. return 0;
  404. } else if (match_type(to_keymgmt, from->keymgmt)) {
  405. struct evp_keymgmt_util_try_import_data_st import_data;
  406. import_data.keymgmt = to_keymgmt;
  407. import_data.keydata = to_keydata;
  408. import_data.selection = selection;
  409. if (!evp_keymgmt_util_export(from, selection,
  410. &evp_keymgmt_util_try_import,
  411. &import_data))
  412. return 0;
  413. /*
  414. * In case to_keydata was previously unallocated,
  415. * evp_keymgmt_util_try_import() may have created it for us.
  416. */
  417. if (to_keydata == NULL)
  418. to_keydata = alloc_keydata = import_data.keydata;
  419. } else {
  420. ERR_raise(ERR_LIB_EVP, EVP_R_DIFFERENT_KEY_TYPES);
  421. return 0;
  422. }
  423. /*
  424. * We only need to set the |to| type when its |keymgmt| isn't set.
  425. * We can then just set its |keydata| to what we have, which might
  426. * be exactly what it had when entering this function.
  427. * This is a bit different from using evp_keymgmt_util_assign_pkey(),
  428. * which isn't as careful with |to|'s original |keymgmt|, since it's
  429. * meant to forcibly reassign an EVP_PKEY no matter what, which is
  430. * why we don't use that one here.
  431. */
  432. if (to->keymgmt == NULL
  433. && !EVP_PKEY_set_type_by_keymgmt(to, to_keymgmt)) {
  434. evp_keymgmt_freedata(to_keymgmt, alloc_keydata);
  435. return 0;
  436. }
  437. to->keydata = to_keydata;
  438. evp_keymgmt_util_cache_keyinfo(to);
  439. return 1;
  440. }
  441. void *evp_keymgmt_util_gen(EVP_PKEY *target, EVP_KEYMGMT *keymgmt,
  442. void *genctx, OSSL_CALLBACK *cb, void *cbarg)
  443. {
  444. void *keydata = NULL;
  445. if ((keydata = evp_keymgmt_gen(keymgmt, genctx, cb, cbarg)) == NULL
  446. || !evp_keymgmt_util_assign_pkey(target, keymgmt, keydata)) {
  447. evp_keymgmt_freedata(keymgmt, keydata);
  448. keydata = NULL;
  449. }
  450. return keydata;
  451. }
  452. /*
  453. * Returns the same numbers as EVP_PKEY_get_default_digest_name()
  454. * When the string from the EVP_KEYMGMT implementation is "", we use
  455. * SN_undef, since that corresponds to what EVP_PKEY_get_default_nid()
  456. * returns for no digest.
  457. */
  458. int evp_keymgmt_util_get_deflt_digest_name(EVP_KEYMGMT *keymgmt,
  459. void *keydata,
  460. char *mdname, size_t mdname_sz)
  461. {
  462. OSSL_PARAM params[3];
  463. char mddefault[100] = "";
  464. char mdmandatory[100] = "";
  465. char *result = NULL;
  466. int rv = -2;
  467. params[0] =
  468. OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST,
  469. mddefault, sizeof(mddefault));
  470. params[1] =
  471. OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_MANDATORY_DIGEST,
  472. mdmandatory,
  473. sizeof(mdmandatory));
  474. params[2] = OSSL_PARAM_construct_end();
  475. if (!evp_keymgmt_get_params(keymgmt, keydata, params))
  476. return 0;
  477. if (OSSL_PARAM_modified(params + 1)) {
  478. if (params[1].return_size <= 1) /* Only a NUL byte */
  479. result = SN_undef;
  480. else
  481. result = mdmandatory;
  482. rv = 2;
  483. } else if (OSSL_PARAM_modified(params)) {
  484. if (params[0].return_size <= 1) /* Only a NUL byte */
  485. result = SN_undef;
  486. else
  487. result = mddefault;
  488. rv = 1;
  489. }
  490. if (rv > 0)
  491. OPENSSL_strlcpy(mdname, result, mdname_sz);
  492. return rv;
  493. }
  494. /*
  495. * If |keymgmt| has the method function |query_operation_name|, use it to get
  496. * the name of a supported operation identity. Otherwise, return the keytype,
  497. * assuming that it works as a default operation name.
  498. */
  499. const char *evp_keymgmt_util_query_operation_name(EVP_KEYMGMT *keymgmt,
  500. int op_id)
  501. {
  502. const char *name = NULL;
  503. if (keymgmt != NULL) {
  504. if (keymgmt->query_operation_name != NULL)
  505. name = keymgmt->query_operation_name(op_id);
  506. if (name == NULL)
  507. name = EVP_KEYMGMT_get0_name(keymgmt);
  508. }
  509. return name;
  510. }