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129 .\" ========================================================================
130 .\"
131 .IX Title "BIO_f_ssl 3"
132 .TH BIO_f_ssl 3 "2009-07-23" "0.9.8k" "OpenSSL"
133 .SH "NAME"
134 BIO_f_ssl, BIO_set_ssl, BIO_get_ssl, BIO_set_ssl_mode, BIO_set_ssl_renegotiate_bytes,
135 BIO_get_num_renegotiates, BIO_set_ssl_renegotiate_timeout, BIO_new_ssl,
136 BIO_new_ssl_connect, BIO_new_buffer_ssl_connect, BIO_ssl_copy_session_id,
137 BIO_ssl_shutdown \- SSL BIO
138 .SH "SYNOPSIS"
139 .IX Header "SYNOPSIS"
140 .Vb 2
141 \& #include <openssl/bio.h>
142 \& #include <openssl/ssl.h>
143 .Ve
144 .PP
145 .Vb 1
146 \& BIO_METHOD *BIO_f_ssl(void);
147 .Ve
148 .PP
149 .Vb 9
150 \& #define BIO_set_ssl(b,ssl,c) BIO_ctrl(b,BIO_C_SET_SSL,c,(char *)ssl)
151 \& #define BIO_get_ssl(b,sslp) BIO_ctrl(b,BIO_C_GET_SSL,0,(char *)sslp)
152 \& #define BIO_set_ssl_mode(b,client) BIO_ctrl(b,BIO_C_SSL_MODE,client,NULL)
153 \& #define BIO_set_ssl_renegotiate_bytes(b,num) \e
154 \& BIO_ctrl(b,BIO_C_SET_SSL_RENEGOTIATE_BYTES,num,NULL);
155 \& #define BIO_set_ssl_renegotiate_timeout(b,seconds) \e
156 \& BIO_ctrl(b,BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT,seconds,NULL);
157 \& #define BIO_get_num_renegotiates(b) \e
158 \& BIO_ctrl(b,BIO_C_SET_SSL_NUM_RENEGOTIATES,0,NULL);
159 .Ve
160 .PP
161 .Vb 5
162 \& BIO *BIO_new_ssl(SSL_CTX *ctx,int client);
163 \& BIO *BIO_new_ssl_connect(SSL_CTX *ctx);
164 \& BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx);
165 \& int BIO_ssl_copy_session_id(BIO *to,BIO *from);
166 \& void BIO_ssl_shutdown(BIO *bio);
167 .Ve
168 .PP
169 .Vb 1
170 \& #define BIO_do_handshake(b) BIO_ctrl(b,BIO_C_DO_STATE_MACHINE,0,NULL)
171 .Ve
172 .SH "DESCRIPTION"
173 .IX Header "DESCRIPTION"
174 \&\fIBIO_f_ssl()\fR returns the \s-1SSL\s0 \s-1BIO\s0 method. This is a filter \s-1BIO\s0 which
175 is a wrapper round the OpenSSL \s-1SSL\s0 routines adding a \s-1BIO\s0 \*(L"flavour\*(R" to
176 \&\s-1SSL\s0 I/O.
177 .PP
178 I/O performed on an \s-1SSL\s0 \s-1BIO\s0 communicates using the \s-1SSL\s0 protocol with
179 the SSLs read and write BIOs. If an \s-1SSL\s0 connection is not established
180 then an attempt is made to establish one on the first I/O call.
181 .PP
182 If a \s-1BIO\s0 is appended to an \s-1SSL\s0 \s-1BIO\s0 using \fIBIO_push()\fR it is automatically
183 used as the \s-1SSL\s0 BIOs read and write BIOs.
184 .PP
185 Calling \fIBIO_reset()\fR on an \s-1SSL\s0 \s-1BIO\s0 closes down any current \s-1SSL\s0 connection
186 by calling \fISSL_shutdown()\fR. \fIBIO_reset()\fR is then sent to the next \s-1BIO\s0 in
187 the chain: this will typically disconnect the underlying transport.
188 The \s-1SSL\s0 \s-1BIO\s0 is then reset to the initial accept or connect state.
189 .PP
190 If the close flag is set when an \s-1SSL\s0 \s-1BIO\s0 is freed then the internal
191 \&\s-1SSL\s0 structure is also freed using \fISSL_free()\fR.
192 .PP
193 \&\fIBIO_set_ssl()\fR sets the internal \s-1SSL\s0 pointer of \s-1BIO\s0 \fBb\fR to \fBssl\fR using
194 the close flag \fBc\fR.
195 .PP
196 \&\fIBIO_get_ssl()\fR retrieves the \s-1SSL\s0 pointer of \s-1BIO\s0 \fBb\fR, it can then be
197 manipulated using the standard \s-1SSL\s0 library functions.
198 .PP
199 \&\fIBIO_set_ssl_mode()\fR sets the \s-1SSL\s0 \s-1BIO\s0 mode to \fBclient\fR. If \fBclient\fR
200 is 1 client mode is set. If \fBclient\fR is 0 server mode is set.
201 .PP
202 \&\fIBIO_set_ssl_renegotiate_bytes()\fR sets the renegotiate byte count
203 to \fBnum\fR. When set after every \fBnum\fR bytes of I/O (read and write)
204 the \s-1SSL\s0 session is automatically renegotiated. \fBnum\fR must be at
205 least 512 bytes.
206 .PP
207 \&\fIBIO_set_ssl_renegotiate_timeout()\fR sets the renegotiate timeout to
208 \&\fBseconds\fR. When the renegotiate timeout elapses the session is
209 automatically renegotiated.
210 .PP
211 \&\fIBIO_get_num_renegotiates()\fR returns the total number of session
212 renegotiations due to I/O or timeout.
213 .PP
214 \&\fIBIO_new_ssl()\fR allocates an \s-1SSL\s0 \s-1BIO\s0 using \s-1SSL_CTX\s0 \fBctx\fR and using
215 client mode if \fBclient\fR is non zero.
216 .PP
217 \&\fIBIO_new_ssl_connect()\fR creates a new \s-1BIO\s0 chain consisting of an
218 \&\s-1SSL\s0 \s-1BIO\s0 (using \fBctx\fR) followed by a connect \s-1BIO\s0.
219 .PP
220 \&\fIBIO_new_buffer_ssl_connect()\fR creates a new \s-1BIO\s0 chain consisting
221 of a buffering \s-1BIO\s0, an \s-1SSL\s0 \s-1BIO\s0 (using \fBctx\fR) and a connect
222 \&\s-1BIO\s0.
223 .PP
224 \&\fIBIO_ssl_copy_session_id()\fR copies an \s-1SSL\s0 session id between
225 \&\s-1BIO\s0 chains \fBfrom\fR and \fBto\fR. It does this by locating the
226 \&\s-1SSL\s0 BIOs in each chain and calling \fISSL_copy_session_id()\fR on
227 the internal \s-1SSL\s0 pointer.
228 .PP
229 \&\fIBIO_ssl_shutdown()\fR closes down an \s-1SSL\s0 connection on \s-1BIO\s0
230 chain \fBbio\fR. It does this by locating the \s-1SSL\s0 \s-1BIO\s0 in the
231 chain and calling \fISSL_shutdown()\fR on its internal \s-1SSL\s0
232 pointer.
233 .PP
234 \&\fIBIO_do_handshake()\fR attempts to complete an \s-1SSL\s0 handshake on the
235 supplied \s-1BIO\s0 and establish the \s-1SSL\s0 connection. It returns 1
236 if the connection was established successfully. A zero or negative
237 value is returned if the connection could not be established, the
238 call \fIBIO_should_retry()\fR should be used for non blocking connect BIOs
239 to determine if the call should be retried. If an \s-1SSL\s0 connection has
240 already been established this call has no effect.
241 .SH "NOTES"
242 .IX Header "NOTES"
243 \&\s-1SSL\s0 BIOs are exceptional in that if the underlying transport
244 is non blocking they can still request a retry in exceptional
245 circumstances. Specifically this will happen if a session
246 renegotiation takes place during a \fIBIO_read()\fR operation, one
247 case where this happens is when \s-1SGC\s0 or step up occurs.
248 .PP
249 In OpenSSL 0.9.6 and later the \s-1SSL\s0 flag \s-1SSL_AUTO_RETRY\s0 can be
250 set to disable this behaviour. That is when this flag is set
251 an \s-1SSL\s0 \s-1BIO\s0 using a blocking transport will never request a
252 retry.
253 .PP
254 Since unknown \fIBIO_ctrl()\fR operations are sent through filter
255 BIOs the servers name and port can be set using \fIBIO_set_host()\fR
256 on the \s-1BIO\s0 returned by \fIBIO_new_ssl_connect()\fR without having
257 to locate the connect \s-1BIO\s0 first.
258 .PP
259 Applications do not have to call \fIBIO_do_handshake()\fR but may wish
260 to do so to separate the handshake process from other I/O
261 processing.
262 .SH "RETURN VALUES"
263 .IX Header "RETURN VALUES"
264 \&\s-1TBA\s0
265 .SH "EXAMPLE"
266 .IX Header "EXAMPLE"
267 This \s-1SSL/TLS\s0 client example, attempts to retrieve a page from an
268 \&\s-1SSL/TLS\s0 web server. The I/O routines are identical to those of the
269 unencrypted example in \fIBIO_s_connect\fR\|(3).
270 .PP
271 .Vb 5
272 \& BIO *sbio, *out;
273 \& int len;
274 \& char tmpbuf[1024];
275 \& SSL_CTX *ctx;
276 \& SSL *ssl;
277 .Ve
278 .PP
279 .Vb 3
280 \& ERR_load_crypto_strings();
281 \& ERR_load_SSL_strings();
282 \& OpenSSL_add_all_algorithms();
283 .Ve
284 .PP
285 .Vb 3
286 \& /* We would seed the PRNG here if the platform didn't
287 \& * do it automatically
288 \& */
289 .Ve
290 .PP
291 .Vb 1
292 \& ctx = SSL_CTX_new(SSLv23_client_method());
293 .Ve
294 .PP
295 .Vb 4
296 \& /* We'd normally set some stuff like the verify paths and
297 \& * mode here because as things stand this will connect to
298 \& * any server whose certificate is signed by any CA.
299 \& */
300 .Ve
301 .PP
302 .Vb 1
303 \& sbio = BIO_new_ssl_connect(ctx);
304 .Ve
305 .PP
306 .Vb 1
307 \& BIO_get_ssl(sbio, &ssl);
308 .Ve
309 .PP
310 .Vb 4
311 \& if(!ssl) {
312 \& fprintf(stderr, "Can't locate SSL pointer\en");
313 \& /* whatever ... */
314 \& }
315 .Ve
316 .PP
317 .Vb 2
318 \& /* Don't want any retries */
319 \& SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
320 .Ve
321 .PP
322 .Vb 1
323 \& /* We might want to do other things with ssl here */
324 .Ve
325 .PP
326 .Vb 1
327 \& BIO_set_conn_hostname(sbio, "localhost:https");
328 .Ve
329 .PP
330 .Vb 6
331 \& out = BIO_new_fp(stdout, BIO_NOCLOSE);
332 \& if(BIO_do_connect(sbio) <= 0) {
333 \& fprintf(stderr, "Error connecting to server\en");
334 \& ERR_print_errors_fp(stderr);
335 \& /* whatever ... */
336 \& }
337 .Ve
338 .PP
339 .Vb 5
340 \& if(BIO_do_handshake(sbio) <= 0) {
341 \& fprintf(stderr, "Error establishing SSL connection\en");
342 \& ERR_print_errors_fp(stderr);
343 \& /* whatever ... */
344 \& }
345 .Ve
346 .PP
347 .Vb 1
348 \& /* Could examine ssl here to get connection info */
349 .Ve
350 .PP
351 .Vb 8
352 \& BIO_puts(sbio, "GET / HTTP/1.0\en\en");
353 \& for(;;) {
354 \& len = BIO_read(sbio, tmpbuf, 1024);
355 \& if(len <= 0) break;
356 \& BIO_write(out, tmpbuf, len);
357 \& }
358 \& BIO_free_all(sbio);
359 \& BIO_free(out);
360 .Ve
361 .PP
362 Here is a simple server example. It makes use of a buffering
363 \&\s-1BIO\s0 to allow lines to be read from the \s-1SSL\s0 \s-1BIO\s0 using BIO_gets.
364 It creates a pseudo web page containing the actual request from
365 a client and also echoes the request to standard output.
366 .PP
367 .Vb 5
368 \& BIO *sbio, *bbio, *acpt, *out;
369 \& int len;
370 \& char tmpbuf[1024];
371 \& SSL_CTX *ctx;
372 \& SSL *ssl;
373 .Ve
374 .PP
375 .Vb 3
376 \& ERR_load_crypto_strings();
377 \& ERR_load_SSL_strings();
378 \& OpenSSL_add_all_algorithms();
379 .Ve
380 .PP
381 .Vb 1
382 \& /* Might seed PRNG here */
383 .Ve
384 .PP
385 .Vb 1
386 \& ctx = SSL_CTX_new(SSLv23_server_method());
387 .Ve
388 .PP
389 .Vb 3
390 \& if (!SSL_CTX_use_certificate_file(ctx,"server.pem",SSL_FILETYPE_PEM)
391 \& || !SSL_CTX_use_PrivateKey_file(ctx,"server.pem",SSL_FILETYPE_PEM)
392 \& || !SSL_CTX_check_private_key(ctx)) {
393 .Ve
394 .PP
395 .Vb 4
396 \& fprintf(stderr, "Error setting up SSL_CTX\en");
397 \& ERR_print_errors_fp(stderr);
398 \& return 0;
399 \& }
400 .Ve
401 .PP
402 .Vb 3
403 \& /* Might do other things here like setting verify locations and
404 \& * DH and/or RSA temporary key callbacks
405 \& */
406 .Ve
407 .PP
408 .Vb 2
409 \& /* New SSL BIO setup as server */
410 \& sbio=BIO_new_ssl(ctx,0);
411 .Ve
412 .PP
413 .Vb 1
414 \& BIO_get_ssl(sbio, &ssl);
415 .Ve
416 .PP
417 .Vb 4
418 \& if(!ssl) {
419 \& fprintf(stderr, "Can't locate SSL pointer\en");
420 \& /* whatever ... */
421 \& }
422 .Ve
423 .PP
424 .Vb 2
425 \& /* Don't want any retries */
426 \& SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
427 .Ve
428 .PP
429 .Vb 1
430 \& /* Create the buffering BIO */
431 .Ve
432 .PP
433 .Vb 1
434 \& bbio = BIO_new(BIO_f_buffer());
435 .Ve
436 .PP
437 .Vb 2
438 \& /* Add to chain */
439 \& sbio = BIO_push(bbio, sbio);
440 .Ve
441 .PP
442 .Vb 1
443 \& acpt=BIO_new_accept("4433");
444 .Ve
445 .PP
446 .Vb 5
447 \& /* By doing this when a new connection is established
448 \& * we automatically have sbio inserted into it. The
449 \& * BIO chain is now 'swallowed' by the accept BIO and
450 \& * will be freed when the accept BIO is freed.
451 \& */
452 .Ve
453 .PP
454 .Vb 1
455 \& BIO_set_accept_bios(acpt,sbio);
456 .Ve
457 .PP
458 .Vb 1
459 \& out = BIO_new_fp(stdout, BIO_NOCLOSE);
460 .Ve
461 .PP
462 .Vb 6
463 \& /* Setup accept BIO */
464 \& if(BIO_do_accept(acpt) <= 0) {
465 \& fprintf(stderr, "Error setting up accept BIO\en");
466 \& ERR_print_errors_fp(stderr);
467 \& return 0;
468 \& }
469 .Ve
470 .PP
471 .Vb 6
472 \& /* Now wait for incoming connection */
473 \& if(BIO_do_accept(acpt) <= 0) {
474 \& fprintf(stderr, "Error in connection\en");
475 \& ERR_print_errors_fp(stderr);
476 \& return 0;
477 \& }
478 .Ve
479 .PP
480 .Vb 3
481 \& /* We only want one connection so remove and free
482 \& * accept BIO
483 \& */
484 .Ve
485 .PP
486 .Vb 1
487 \& sbio = BIO_pop(acpt);
488 .Ve
489 .PP
490 .Vb 1
491 \& BIO_free_all(acpt);
492 .Ve
493 .PP
494 .Vb 5
495 \& if(BIO_do_handshake(sbio) <= 0) {
496 \& fprintf(stderr, "Error in SSL handshake\en");
497 \& ERR_print_errors_fp(stderr);
498 \& return 0;
499 \& }
500 .Ve
501 .PP
502 .Vb 3
503 \& BIO_puts(sbio, "HTTP/1.0 200 OK\er\enContent-type: text/plain\er\en\er\en");
504 \& BIO_puts(sbio, "\er\enConnection Established\er\enRequest headers:\er\en");
505 \& BIO_puts(sbio, "--------------------------------------------------\er\en");
506 .Ve
507 .PP
508 .Vb 8
509 \& for(;;) {
510 \& len = BIO_gets(sbio, tmpbuf, 1024);
511 \& if(len <= 0) break;
512 \& BIO_write(sbio, tmpbuf, len);
513 \& BIO_write(out, tmpbuf, len);
514 \& /* Look for blank line signifying end of headers*/
515 \& if((tmpbuf[0] == '\er') || (tmpbuf[0] == '\en')) break;
516 \& }
517 .Ve
518 .PP
519 .Vb 2
520 \& BIO_puts(sbio, "--------------------------------------------------\er\en");
521 \& BIO_puts(sbio, "\er\en");
522 .Ve
523 .PP
524 .Vb 2
525 \& /* Since there is a buffering BIO present we had better flush it */
526 \& BIO_flush(sbio);
527 .Ve
528 .PP
529 .Vb 1
530 \& BIO_free_all(sbio);
531 .Ve
532 .SH "SEE ALSO"
533 .IX Header "SEE ALSO"
534 \&\s-1TBA\s0