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1 | /* | |
2 | * libratbox: a library used by ircd-ratbox and other things | |
3 | * openssl.c: openssl related code | |
4 | * | |
5 | * Copyright (C) 2007-2008 ircd-ratbox development team | |
6 | * Copyright (C) 2007-2008 Aaron Sethman <androsyn@ratbox.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 | |
21 | * USA | |
22 | * | |
23 | * $Id: commio.c 24808 2008-01-02 08:17:05Z androsyn $ | |
24 | */ | |
25 | ||
26 | #include <libratbox_config.h> | |
27 | #include <ratbox_lib.h> | |
28 | ||
29 | #ifdef HAVE_OPENSSL | |
30 | ||
31 | #include <commio-int.h> | |
32 | #include <commio-ssl.h> | |
33 | #include <openssl/ssl.h> | |
34 | #include <openssl/dh.h> | |
35 | #include <openssl/err.h> | |
36 | #include <openssl/rand.h> | |
37 | ||
38 | static SSL_CTX *ssl_server_ctx; | |
39 | static SSL_CTX *ssl_client_ctx; | |
40 | static int libratbox_index = -1; | |
41 | ||
42 | static unsigned long get_last_err(void) | |
43 | { | |
44 | unsigned long t_err, err = 0; | |
45 | err = ERR_get_error(); | |
46 | if(err == 0) | |
47 | return 0; | |
48 | ||
49 | while((t_err = ERR_get_error()) > 0) | |
50 | err = t_err; | |
51 | ||
52 | return err; | |
53 | } | |
54 | ||
55 | void | |
56 | rb_ssl_shutdown(rb_fde_t * F) | |
57 | { | |
58 | int i; | |
59 | if(F == NULL || F->ssl == NULL) | |
60 | return; | |
61 | SSL_set_shutdown((SSL *) F->ssl, SSL_RECEIVED_SHUTDOWN); | |
62 | ||
63 | for (i = 0; i < 4; i++) | |
64 | { | |
65 | if(SSL_shutdown((SSL *) F->ssl)) | |
66 | break; | |
67 | } | |
68 | get_last_err(); | |
69 | SSL_free((SSL *) F->ssl); | |
70 | } | |
71 | ||
72 | unsigned int | |
73 | rb_ssl_handshake_count(rb_fde_t *F) | |
74 | { | |
75 | return F->handshake_count; | |
76 | } | |
77 | ||
78 | void | |
79 | rb_ssl_clear_handshake_count(rb_fde_t *F) | |
80 | { | |
81 | F->handshake_count = 0; | |
82 | } | |
83 | ||
84 | static void | |
85 | rb_ssl_timeout(rb_fde_t * F, void *notused) | |
86 | { | |
87 | lrb_assert(F->accept != NULL); | |
88 | F->accept->callback(F, RB_ERR_TIMEOUT, NULL, 0, F->accept->data); | |
89 | } | |
90 | ||
91 | ||
92 | static void rb_ssl_info_callback(SSL *ssl, int where, int ret) | |
93 | { | |
94 | if(where & SSL_CB_HANDSHAKE_START) | |
95 | { | |
96 | rb_fde_t *F = SSL_get_ex_data(ssl, libratbox_index); | |
97 | if(F == NULL) | |
98 | return; | |
99 | F->handshake_count++; | |
100 | } | |
101 | } | |
102 | ||
103 | static void | |
104 | rb_setup_ssl_cb(rb_fde_t *F) | |
105 | { | |
106 | SSL_set_ex_data(F->ssl, libratbox_index, (char *)F); | |
107 | SSL_set_info_callback((SSL *)F->ssl, (void *)rb_ssl_info_callback); | |
108 | } | |
109 | ||
110 | static void | |
111 | rb_ssl_tryaccept(rb_fde_t * F, void *data) | |
112 | { | |
113 | int ssl_err; | |
114 | lrb_assert(F->accept != NULL); | |
115 | int flags; | |
116 | struct acceptdata *ad; | |
117 | ||
118 | if(!SSL_is_init_finished((SSL *) F->ssl)) | |
119 | { | |
120 | if((ssl_err = SSL_accept((SSL *) F->ssl)) <= 0) | |
121 | { | |
122 | switch (ssl_err = SSL_get_error((SSL *) F->ssl, ssl_err)) | |
123 | { | |
124 | case SSL_ERROR_WANT_READ: | |
125 | case SSL_ERROR_WANT_WRITE: | |
126 | if(ssl_err == SSL_ERROR_WANT_WRITE) | |
127 | flags = RB_SELECT_WRITE; | |
128 | else | |
129 | flags = RB_SELECT_READ; | |
130 | F->ssl_errno = get_last_err(); | |
131 | rb_setselect(F, flags, rb_ssl_tryaccept, NULL); | |
132 | break; | |
133 | case SSL_ERROR_SYSCALL: | |
134 | F->accept->callback(F, RB_ERROR, NULL, 0, F->accept->data); | |
135 | break; | |
136 | default: | |
137 | F->ssl_errno = get_last_err(); | |
138 | F->accept->callback(F, RB_ERROR_SSL, NULL, 0, F->accept->data); | |
139 | break; | |
140 | } | |
141 | return; | |
142 | } | |
143 | } | |
144 | rb_settimeout(F, 0, NULL, NULL); | |
145 | rb_setselect(F, RB_SELECT_READ | RB_SELECT_WRITE, NULL, NULL); | |
146 | ||
147 | ad = F->accept; | |
148 | F->accept = NULL; | |
149 | ad->callback(F, RB_OK, (struct sockaddr *) &ad->S, ad->addrlen, | |
150 | ad->data); | |
151 | rb_free(ad); | |
152 | ||
153 | } | |
154 | ||
155 | ||
156 | static void | |
157 | rb_ssl_accept_common(rb_fde_t *new_F) | |
158 | { | |
159 | int ssl_err; | |
160 | if((ssl_err = SSL_accept((SSL *) new_F->ssl)) <= 0) | |
161 | { | |
162 | switch (ssl_err = SSL_get_error((SSL *) new_F->ssl, ssl_err)) | |
163 | { | |
164 | case SSL_ERROR_SYSCALL: | |
165 | if(rb_ignore_errno(errno)) | |
166 | case SSL_ERROR_WANT_READ: | |
167 | case SSL_ERROR_WANT_WRITE: | |
168 | { | |
169 | new_F->ssl_errno = get_last_err(); | |
170 | rb_setselect(new_F, RB_SELECT_READ | RB_SELECT_WRITE, | |
171 | rb_ssl_tryaccept, NULL); | |
172 | return; | |
173 | } | |
174 | default: | |
175 | new_F->ssl_errno = get_last_err(); | |
176 | new_F->accept->callback(new_F, RB_ERROR_SSL, NULL, 0, new_F->accept->data); | |
177 | return; | |
178 | } | |
179 | } | |
180 | else | |
181 | { | |
182 | rb_ssl_tryaccept(new_F, NULL); | |
183 | } | |
184 | } | |
185 | ||
186 | void | |
187 | rb_ssl_start_accepted(rb_fde_t * new_F, ACCB * cb, void *data, int timeout) | |
188 | { | |
189 | new_F->type |= RB_FD_SSL; | |
190 | new_F->ssl = SSL_new(ssl_server_ctx); | |
191 | new_F->accept = rb_malloc(sizeof(struct acceptdata)); | |
192 | ||
193 | new_F->accept->callback = cb; | |
194 | new_F->accept->data = data; | |
195 | rb_settimeout(new_F, timeout, rb_ssl_timeout, NULL); | |
196 | ||
197 | new_F->accept->addrlen = 0; | |
198 | SSL_set_fd((SSL *) new_F->ssl, rb_get_fd(new_F)); | |
199 | rb_setup_ssl_cb(new_F); | |
200 | rb_ssl_accept_common(new_F); | |
201 | } | |
202 | ||
203 | ||
204 | ||
205 | ||
206 | void | |
207 | rb_ssl_accept_setup(rb_fde_t * F, rb_fde_t *new_F, struct sockaddr *st, int addrlen) | |
208 | { | |
209 | new_F->type |= RB_FD_SSL; | |
210 | new_F->ssl = SSL_new(ssl_server_ctx); | |
211 | new_F->accept = rb_malloc(sizeof(struct acceptdata)); | |
212 | ||
213 | new_F->accept->callback = F->accept->callback; | |
214 | new_F->accept->data = F->accept->data; | |
215 | rb_settimeout(new_F, 10, rb_ssl_timeout, NULL); | |
216 | memcpy(&new_F->accept->S, st, addrlen); | |
217 | new_F->accept->addrlen = addrlen; | |
218 | ||
219 | SSL_set_fd((SSL *) new_F->ssl, rb_get_fd(new_F)); | |
220 | rb_setup_ssl_cb(new_F); | |
221 | rb_ssl_accept_common(new_F); | |
222 | } | |
223 | ||
224 | static ssize_t | |
225 | rb_ssl_read_or_write(int r_or_w, rb_fde_t * F, void *rbuf, const void *wbuf, size_t count) | |
226 | { | |
227 | ssize_t ret; | |
228 | unsigned long err; | |
229 | SSL *ssl = F->ssl; | |
230 | ||
231 | if(r_or_w == 0) | |
232 | ret = (ssize_t)SSL_read(ssl, rbuf, (int) count); | |
233 | else | |
234 | ret = (ssize_t)SSL_write(ssl, wbuf, (int) count); | |
235 | ||
236 | if(ret < 0) | |
237 | { | |
238 | switch (SSL_get_error(ssl, ret)) | |
239 | { | |
240 | case SSL_ERROR_WANT_READ: | |
241 | errno = EAGAIN; | |
242 | return RB_RW_SSL_NEED_READ; | |
243 | case SSL_ERROR_WANT_WRITE: | |
244 | errno = EAGAIN; | |
245 | return RB_RW_SSL_NEED_WRITE; | |
246 | case SSL_ERROR_ZERO_RETURN: | |
247 | return 0; | |
248 | case SSL_ERROR_SYSCALL: | |
249 | err = get_last_err(); | |
250 | if(err == 0) | |
251 | { | |
252 | F->ssl_errno = 0; | |
253 | return RB_RW_IO_ERROR; | |
254 | } | |
255 | break; | |
256 | default: | |
257 | err = get_last_err(); | |
258 | break; | |
259 | } | |
260 | F->ssl_errno = err; | |
261 | if(err > 0) | |
262 | { | |
263 | errno = EIO; /* not great but... */ | |
264 | return RB_RW_SSL_ERROR; | |
265 | } | |
266 | return RB_RW_IO_ERROR; | |
267 | } | |
268 | return ret; | |
269 | } | |
270 | ||
271 | ssize_t | |
272 | rb_ssl_read(rb_fde_t * F, void *buf, size_t count) | |
273 | { | |
274 | return rb_ssl_read_or_write(0, F, buf, NULL, count); | |
275 | } | |
276 | ||
277 | ssize_t | |
278 | rb_ssl_write(rb_fde_t * F, const void *buf, size_t count) | |
279 | { | |
280 | return rb_ssl_read_or_write(1, F, NULL, buf, count); | |
281 | } | |
282 | ||
283 | int | |
284 | rb_init_ssl(void) | |
285 | { | |
286 | int ret = 1; | |
287 | char libratbox_data[] = "libratbox data"; | |
288 | SSL_load_error_strings(); | |
289 | SSL_library_init(); | |
290 | libratbox_index = SSL_get_ex_new_index(0, libratbox_data, NULL, NULL, NULL); | |
291 | ssl_server_ctx = SSL_CTX_new(SSLv23_server_method()); | |
292 | if(ssl_server_ctx == NULL) | |
293 | { | |
294 | rb_lib_log("rb_init_openssl: Unable to initialize OpenSSL server context: %s", | |
295 | ERR_error_string(ERR_get_error(), NULL)); | |
296 | ret = 0; | |
297 | } | |
298 | /* Disable SSLv2, make the client use our settings */ | |
299 | SSL_CTX_set_options(ssl_server_ctx, SSL_OP_NO_SSLv2 | SSL_OP_CIPHER_SERVER_PREFERENCE); | |
300 | ||
301 | ssl_client_ctx = SSL_CTX_new(TLSv1_client_method()); | |
302 | ||
303 | if(ssl_client_ctx == NULL) | |
304 | { | |
305 | rb_lib_log("rb_init_openssl: Unable to initialize OpenSSL client context: %s", | |
306 | ERR_error_string(ERR_get_error(), NULL)); | |
307 | ret = 0; | |
308 | } | |
309 | return ret; | |
310 | } | |
311 | ||
312 | ||
313 | int | |
314 | rb_setup_ssl_server(const char *cert, const char *keyfile, const char *dhfile) | |
315 | { | |
316 | FILE *param; | |
317 | DH *dh; | |
318 | unsigned long err; | |
319 | if(cert == NULL) | |
320 | { | |
321 | rb_lib_log("rb_setup_ssl_server: No certificate file"); | |
322 | return 0; | |
323 | } | |
324 | if(!SSL_CTX_use_certificate_file(ssl_server_ctx, cert, SSL_FILETYPE_PEM)) | |
325 | { | |
326 | err = ERR_get_error(); | |
327 | rb_lib_log("rb_setup_ssl_server: Error loading certificate file [%s]: %s", cert, | |
328 | ERR_error_string(err, NULL)); | |
329 | return 0; | |
330 | } | |
331 | ||
332 | if(keyfile == NULL) | |
333 | { | |
334 | rb_lib_log("rb_setup_ssl_server: No key file"); | |
335 | return 0; | |
336 | } | |
337 | ||
338 | ||
339 | if(!SSL_CTX_use_PrivateKey_file(ssl_server_ctx, keyfile, SSL_FILETYPE_PEM)) | |
340 | { | |
341 | err = ERR_get_error(); | |
342 | rb_lib_log("rb_setup_ssl_server: Error loading keyfile [%s]: %s", keyfile, | |
343 | ERR_error_string(err, NULL)); | |
344 | return 0; | |
345 | } | |
346 | ||
347 | if(dhfile != NULL) | |
348 | { | |
349 | /* DH parameters aren't necessary, but they are nice..if they didn't pass one..that is their problem */ | |
350 | param = fopen(dhfile, "r"); | |
351 | if(param != NULL) | |
352 | { | |
353 | dh = PEM_read_DHparams(param, NULL, NULL, NULL); | |
354 | if(dh == NULL) | |
355 | { | |
356 | err = ERR_get_error(); | |
357 | rb_lib_log | |
358 | ("rb_setup_ssl_server: Error loading DH params file [%s]: %s", | |
359 | param, ERR_error_string(err, NULL)); | |
360 | fclose(param); | |
361 | return 0; | |
362 | } | |
363 | SSL_CTX_set_tmp_dh(ssl_server_ctx, dh); | |
364 | fclose(param); | |
365 | } | |
366 | } | |
367 | return 1; | |
368 | } | |
369 | ||
370 | int | |
371 | rb_ssl_listen(rb_fde_t * F, int backlog) | |
372 | { | |
373 | F->type = RB_FD_SOCKET | RB_FD_LISTEN | RB_FD_SSL; | |
374 | return listen(F->fd, backlog); | |
375 | } | |
376 | ||
377 | struct ssl_connect | |
378 | { | |
379 | CNCB *callback; | |
380 | void *data; | |
381 | int timeout; | |
382 | }; | |
383 | ||
384 | static void | |
385 | rb_ssl_connect_realcb(rb_fde_t * F, int status, struct ssl_connect *sconn) | |
386 | { | |
387 | F->connect->callback = sconn->callback; | |
388 | F->connect->data = sconn->data; | |
389 | rb_free(sconn); | |
390 | rb_connect_callback(F, status); | |
391 | } | |
392 | ||
393 | static void | |
394 | rb_ssl_tryconn_timeout_cb(rb_fde_t * F, void *data) | |
395 | { | |
396 | rb_ssl_connect_realcb(F, RB_ERR_TIMEOUT, data); | |
397 | } | |
398 | ||
399 | static void | |
400 | rb_ssl_tryconn_cb(rb_fde_t * F, void *data) | |
401 | { | |
402 | struct ssl_connect *sconn = data; | |
403 | int ssl_err; | |
404 | if(!SSL_is_init_finished((SSL *) F->ssl)) | |
405 | { | |
406 | if((ssl_err = SSL_connect((SSL *) F->ssl)) <= 0) | |
407 | { | |
408 | switch (ssl_err = SSL_get_error((SSL *) F->ssl, ssl_err)) | |
409 | { | |
410 | case SSL_ERROR_SYSCALL: | |
411 | if(rb_ignore_errno(errno)) | |
412 | case SSL_ERROR_WANT_READ: | |
413 | case SSL_ERROR_WANT_WRITE: | |
414 | { | |
415 | F->ssl_errno = get_last_err(); | |
416 | rb_setselect(F, RB_SELECT_READ | RB_SELECT_WRITE, | |
417 | rb_ssl_tryconn_cb, sconn); | |
418 | return; | |
419 | } | |
420 | default: | |
421 | F->ssl_errno = get_last_err(); | |
422 | rb_ssl_connect_realcb(F, RB_ERROR_SSL, sconn); | |
423 | return; | |
424 | } | |
425 | } | |
426 | else | |
427 | { | |
428 | rb_ssl_connect_realcb(F, RB_OK, sconn); | |
429 | } | |
430 | } | |
431 | } | |
432 | ||
433 | static void | |
434 | rb_ssl_tryconn(rb_fde_t * F, int status, void *data) | |
435 | { | |
436 | struct ssl_connect *sconn = data; | |
437 | int ssl_err; | |
438 | if(status != RB_OK) | |
439 | { | |
440 | rb_ssl_connect_realcb(F, status, sconn); | |
441 | return; | |
442 | } | |
443 | ||
444 | F->type |= RB_FD_SSL; | |
445 | F->ssl = SSL_new(ssl_client_ctx); | |
446 | SSL_set_fd((SSL *) F->ssl, F->fd); | |
447 | rb_setup_ssl_cb(F); | |
448 | rb_settimeout(F, sconn->timeout, rb_ssl_tryconn_timeout_cb, sconn); | |
449 | if((ssl_err = SSL_connect((SSL *) F->ssl)) <= 0) | |
450 | { | |
451 | switch (ssl_err = SSL_get_error((SSL *) F->ssl, ssl_err)) | |
452 | { | |
453 | case SSL_ERROR_SYSCALL: | |
454 | if(rb_ignore_errno(errno)) | |
455 | case SSL_ERROR_WANT_READ: | |
456 | case SSL_ERROR_WANT_WRITE: | |
457 | { | |
458 | F->ssl_errno = get_last_err(); | |
459 | rb_setselect(F, RB_SELECT_READ | RB_SELECT_WRITE, | |
460 | rb_ssl_tryconn_cb, sconn); | |
461 | return; | |
462 | } | |
463 | default: | |
464 | F->ssl_errno = get_last_err(); | |
465 | rb_ssl_connect_realcb(F, RB_ERROR_SSL, sconn); | |
466 | return; | |
467 | } | |
468 | } | |
469 | else | |
470 | { | |
471 | rb_ssl_connect_realcb(F, RB_OK, sconn); | |
472 | } | |
473 | } | |
474 | ||
475 | void | |
476 | rb_connect_tcp_ssl(rb_fde_t * F, struct sockaddr *dest, | |
477 | struct sockaddr *clocal, int socklen, CNCB * callback, void *data, int timeout) | |
478 | { | |
479 | struct ssl_connect *sconn; | |
480 | if(F == NULL) | |
481 | return; | |
482 | ||
483 | sconn = rb_malloc(sizeof(struct ssl_connect)); | |
484 | sconn->data = data; | |
485 | sconn->callback = callback; | |
486 | sconn->timeout = timeout; | |
487 | rb_connect_tcp(F, dest, clocal, socklen, rb_ssl_tryconn, sconn, timeout); | |
488 | ||
489 | } | |
490 | ||
491 | void | |
492 | rb_ssl_start_connected(rb_fde_t * F, CNCB * callback, void *data, int timeout) | |
493 | { | |
494 | struct ssl_connect *sconn; | |
495 | int ssl_err; | |
496 | if(F == NULL) | |
497 | return; | |
498 | ||
499 | sconn = rb_malloc(sizeof(struct ssl_connect)); | |
500 | sconn->data = data; | |
501 | sconn->callback = callback; | |
502 | sconn->timeout = timeout; | |
503 | F->connect = rb_malloc(sizeof(struct conndata)); | |
504 | F->connect->callback = callback; | |
505 | F->connect->data = data; | |
506 | F->type |= RB_FD_SSL; | |
507 | F->ssl = SSL_new(ssl_client_ctx); | |
508 | ||
509 | SSL_set_fd((SSL *) F->ssl, F->fd); | |
510 | rb_setup_ssl_cb(F); | |
511 | rb_settimeout(F, sconn->timeout, rb_ssl_tryconn_timeout_cb, sconn); | |
512 | if((ssl_err = SSL_connect((SSL *) F->ssl)) <= 0) | |
513 | { | |
514 | switch (ssl_err = SSL_get_error((SSL *) F->ssl, ssl_err)) | |
515 | { | |
516 | case SSL_ERROR_SYSCALL: | |
517 | if(rb_ignore_errno(errno)) | |
518 | case SSL_ERROR_WANT_READ: | |
519 | case SSL_ERROR_WANT_WRITE: | |
520 | { | |
521 | F->ssl_errno = get_last_err(); | |
522 | rb_setselect(F, RB_SELECT_READ | RB_SELECT_WRITE, | |
523 | rb_ssl_tryconn_cb, sconn); | |
524 | return; | |
525 | } | |
526 | default: | |
527 | F->ssl_errno = get_last_err(); | |
528 | rb_ssl_connect_realcb(F, RB_ERROR_SSL, sconn); | |
529 | return; | |
530 | } | |
531 | } | |
532 | else | |
533 | { | |
534 | rb_ssl_connect_realcb(F, RB_OK, sconn); | |
535 | } | |
536 | } | |
537 | ||
538 | int | |
539 | rb_init_prng(const char *path, prng_seed_t seed_type) | |
540 | { | |
541 | if(seed_type == RB_PRNG_DEFAULT) | |
542 | { | |
543 | #ifdef WIN32 | |
544 | RAND_screen(); | |
545 | #endif | |
546 | return RAND_status(); | |
547 | } | |
548 | if(path == NULL) | |
549 | return RAND_status(); | |
550 | ||
551 | switch (seed_type) | |
552 | { | |
553 | case RB_PRNG_EGD: | |
554 | if(RAND_egd(path) == -1) | |
555 | return -1; | |
556 | break; | |
557 | case RB_PRNG_FILE: | |
558 | if(RAND_load_file(path, -1) == -1) | |
559 | return -1; | |
560 | break; | |
561 | #ifdef WIN32 | |
562 | case RB_PRNGWIN32: | |
563 | RAND_screen(); | |
564 | break; | |
565 | #endif | |
566 | default: | |
567 | return -1; | |
568 | } | |
569 | ||
570 | return RAND_status(); | |
571 | } | |
572 | ||
573 | int | |
574 | rb_get_random(void *buf, size_t length) | |
575 | { | |
576 | int ret; | |
577 | ||
578 | if((ret = RAND_bytes(buf, length)) == 0) | |
579 | { | |
580 | /* remove the error from the queue */ | |
581 | ERR_get_error(); | |
582 | } | |
583 | return ret; | |
584 | } | |
585 | ||
586 | int | |
587 | rb_get_pseudo_random(void *buf, size_t length) | |
588 | { | |
589 | int ret; | |
590 | ret = RAND_pseudo_bytes(buf, length); | |
591 | if(ret < 0) | |
592 | return 0; | |
593 | return 1; | |
594 | } | |
595 | ||
596 | const char * | |
597 | rb_get_ssl_strerror(rb_fde_t * F) | |
598 | { | |
599 | return ERR_error_string(F->ssl_errno, NULL); | |
600 | } | |
601 | ||
602 | int | |
603 | rb_supports_ssl(void) | |
604 | { | |
605 | return 1; | |
606 | } | |
607 | ||
608 | #endif /* HAVE_OPESSL */ |