Merge from vendor branch OPENSSL:
[dragonfly.git] / secure / lib / libcrypto / man / BIO_f_ssl.3
CommitLineData
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124.\" ========================================================================
125.\"
126.IX Title "BIO_f_ssl 3"
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127.TH BIO_f_ssl 3 "2007-10-24" "0.9.8g" "OpenSSL"
128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
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132.SH "NAME"
133BIO_f_ssl, BIO_set_ssl, BIO_get_ssl, BIO_set_ssl_mode, BIO_set_ssl_renegotiate_bytes,
134BIO_get_num_renegotiates, BIO_set_ssl_renegotiate_timeout, BIO_new_ssl,
135BIO_new_ssl_connect, BIO_new_buffer_ssl_connect, BIO_ssl_copy_session_id,
74dab6c2 136BIO_ssl_shutdown \- SSL BIO
984263bc 137.SH "SYNOPSIS"
8b0cefbb 138.IX Header "SYNOPSIS"
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139.Vb 2
140\& #include <openssl/bio.h>
141\& #include <openssl/ssl.h>
2eaa1526 142\&
984263bc 143\& BIO_METHOD *BIO_f_ssl(void);
2eaa1526 144\&
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145\& #define BIO_set_ssl(b,ssl,c) BIO_ctrl(b,BIO_C_SET_SSL,c,(char *)ssl)
146\& #define BIO_get_ssl(b,sslp) BIO_ctrl(b,BIO_C_GET_SSL,0,(char *)sslp)
147\& #define BIO_set_ssl_mode(b,client) BIO_ctrl(b,BIO_C_SSL_MODE,client,NULL)
148\& #define BIO_set_ssl_renegotiate_bytes(b,num) \e
149\& BIO_ctrl(b,BIO_C_SET_SSL_RENEGOTIATE_BYTES,num,NULL);
150\& #define BIO_set_ssl_renegotiate_timeout(b,seconds) \e
151\& BIO_ctrl(b,BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT,seconds,NULL);
152\& #define BIO_get_num_renegotiates(b) \e
153\& BIO_ctrl(b,BIO_C_SET_SSL_NUM_RENEGOTIATES,0,NULL);
2eaa1526 154\&
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155\& BIO *BIO_new_ssl(SSL_CTX *ctx,int client);
156\& BIO *BIO_new_ssl_connect(SSL_CTX *ctx);
157\& BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx);
158\& int BIO_ssl_copy_session_id(BIO *to,BIO *from);
159\& void BIO_ssl_shutdown(BIO *bio);
2eaa1526 160\&
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161\& #define BIO_do_handshake(b) BIO_ctrl(b,BIO_C_DO_STATE_MACHINE,0,NULL)
162.Ve
163.SH "DESCRIPTION"
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164.IX Header "DESCRIPTION"
165\&\fIBIO_f_ssl()\fR returns the \s-1SSL\s0 \s-1BIO\s0 method. This is a filter \s-1BIO\s0 which
166is a wrapper round the OpenSSL \s-1SSL\s0 routines adding a \s-1BIO\s0 \*(L"flavour\*(R" to
2eaa1526 167\&\s-1SSL\s0 I/O.
984263bc 168.PP
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169I/O performed on an \s-1SSL\s0 \s-1BIO\s0 communicates using the \s-1SSL\s0 protocol with
170the SSLs read and write BIOs. If an \s-1SSL\s0 connection is not established
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171then an attempt is made to establish one on the first I/O call.
172.PP
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173If a \s-1BIO\s0 is appended to an \s-1SSL\s0 \s-1BIO\s0 using \fIBIO_push()\fR it is automatically
174used as the \s-1SSL\s0 BIOs read and write BIOs.
984263bc 175.PP
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176Calling \fIBIO_reset()\fR on an \s-1SSL\s0 \s-1BIO\s0 closes down any current \s-1SSL\s0 connection
177by calling \fISSL_shutdown()\fR. \fIBIO_reset()\fR is then sent to the next \s-1BIO\s0 in
984263bc 178the chain: this will typically disconnect the underlying transport.
8b0cefbb 179The \s-1SSL\s0 \s-1BIO\s0 is then reset to the initial accept or connect state.
984263bc 180.PP
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181If the close flag is set when an \s-1SSL\s0 \s-1BIO\s0 is freed then the internal
182\&\s-1SSL\s0 structure is also freed using \fISSL_free()\fR.
984263bc 183.PP
8b0cefbb 184\&\fIBIO_set_ssl()\fR sets the internal \s-1SSL\s0 pointer of \s-1BIO\s0 \fBb\fR to \fBssl\fR using
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185the close flag \fBc\fR.
186.PP
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187\&\fIBIO_get_ssl()\fR retrieves the \s-1SSL\s0 pointer of \s-1BIO\s0 \fBb\fR, it can then be
188manipulated using the standard \s-1SSL\s0 library functions.
984263bc 189.PP
8b0cefbb 190\&\fIBIO_set_ssl_mode()\fR sets the \s-1SSL\s0 \s-1BIO\s0 mode to \fBclient\fR. If \fBclient\fR
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191is 1 client mode is set. If \fBclient\fR is 0 server mode is set.
192.PP
8b0cefbb 193\&\fIBIO_set_ssl_renegotiate_bytes()\fR sets the renegotiate byte count
984263bc 194to \fBnum\fR. When set after every \fBnum\fR bytes of I/O (read and write)
8b0cefbb 195the \s-1SSL\s0 session is automatically renegotiated. \fBnum\fR must be at
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196least 512 bytes.
197.PP
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198\&\fIBIO_set_ssl_renegotiate_timeout()\fR sets the renegotiate timeout to
199\&\fBseconds\fR. When the renegotiate timeout elapses the session is
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200automatically renegotiated.
201.PP
8b0cefbb 202\&\fIBIO_get_num_renegotiates()\fR returns the total number of session
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203renegotiations due to I/O or timeout.
204.PP
8b0cefbb 205\&\fIBIO_new_ssl()\fR allocates an \s-1SSL\s0 \s-1BIO\s0 using \s-1SSL_CTX\s0 \fBctx\fR and using
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206client mode if \fBclient\fR is non zero.
207.PP
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208\&\fIBIO_new_ssl_connect()\fR creates a new \s-1BIO\s0 chain consisting of an
209\&\s-1SSL\s0 \s-1BIO\s0 (using \fBctx\fR) followed by a connect \s-1BIO\s0.
984263bc 210.PP
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211\&\fIBIO_new_buffer_ssl_connect()\fR creates a new \s-1BIO\s0 chain consisting
212of a buffering \s-1BIO\s0, an \s-1SSL\s0 \s-1BIO\s0 (using \fBctx\fR) and a connect
213\&\s-1BIO\s0.
984263bc 214.PP
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215\&\fIBIO_ssl_copy_session_id()\fR copies an \s-1SSL\s0 session id between
216\&\s-1BIO\s0 chains \fBfrom\fR and \fBto\fR. It does this by locating the
217\&\s-1SSL\s0 BIOs in each chain and calling \fISSL_copy_session_id()\fR on
218the internal \s-1SSL\s0 pointer.
984263bc 219.PP
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220\&\fIBIO_ssl_shutdown()\fR closes down an \s-1SSL\s0 connection on \s-1BIO\s0
221chain \fBbio\fR. It does this by locating the \s-1SSL\s0 \s-1BIO\s0 in the
222chain and calling \fISSL_shutdown()\fR on its internal \s-1SSL\s0
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223pointer.
224.PP
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225\&\fIBIO_do_handshake()\fR attempts to complete an \s-1SSL\s0 handshake on the
226supplied \s-1BIO\s0 and establish the \s-1SSL\s0 connection. It returns 1
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227if the connection was established successfully. A zero or negative
228value is returned if the connection could not be established, the
229call \fIBIO_should_retry()\fR should be used for non blocking connect BIOs
8b0cefbb 230to determine if the call should be retried. If an \s-1SSL\s0 connection has
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231already been established this call has no effect.
232.SH "NOTES"
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233.IX Header "NOTES"
234\&\s-1SSL\s0 BIOs are exceptional in that if the underlying transport
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235is non blocking they can still request a retry in exceptional
236circumstances. Specifically this will happen if a session
237renegotiation takes place during a \fIBIO_read()\fR operation, one
8b0cefbb 238case where this happens is when \s-1SGC\s0 or step up occurs.
984263bc 239.PP
8b0cefbb 240In OpenSSL 0.9.6 and later the \s-1SSL\s0 flag \s-1SSL_AUTO_RETRY\s0 can be
984263bc 241set to disable this behaviour. That is when this flag is set
8b0cefbb 242an \s-1SSL\s0 \s-1BIO\s0 using a blocking transport will never request a
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243retry.
244.PP
245Since unknown \fIBIO_ctrl()\fR operations are sent through filter
246BIOs the servers name and port can be set using \fIBIO_set_host()\fR
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247on the \s-1BIO\s0 returned by \fIBIO_new_ssl_connect()\fR without having
248to locate the connect \s-1BIO\s0 first.
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249.PP
250Applications do not have to call \fIBIO_do_handshake()\fR but may wish
251to do so to separate the handshake process from other I/O
252processing.
253.SH "RETURN VALUES"
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254.IX Header "RETURN VALUES"
255\&\s-1TBA\s0
984263bc 256.SH "EXAMPLE"
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257.IX Header "EXAMPLE"
258This \s-1SSL/TLS\s0 client example, attempts to retrieve a page from an
259\&\s-1SSL/TLS\s0 web server. The I/O routines are identical to those of the
260unencrypted example in \fIBIO_s_connect\fR\|(3).
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261.PP
262.Vb 5
263\& BIO *sbio, *out;
264\& int len;
265\& char tmpbuf[1024];
266\& SSL_CTX *ctx;
267\& SSL *ssl;
2eaa1526 268\&
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269\& ERR_load_crypto_strings();
270\& ERR_load_SSL_strings();
271\& OpenSSL_add_all_algorithms();
2eaa1526 272\&
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273\& /* We would seed the PRNG here if the platform didn't
274\& * do it automatically
275\& */
2eaa1526 276\&
984263bc 277\& ctx = SSL_CTX_new(SSLv23_client_method());
2eaa1526 278\&
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279\& /* We'd normally set some stuff like the verify paths and
280\& * mode here because as things stand this will connect to
281\& * any server whose certificate is signed by any CA.
282\& */
2eaa1526 283\&
984263bc 284\& sbio = BIO_new_ssl_connect(ctx);
2eaa1526 285\&
984263bc 286\& BIO_get_ssl(sbio, &ssl);
2eaa1526 287\&
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288\& if(!ssl) {
289\& fprintf(stderr, "Can't locate SSL pointer\en");
290\& /* whatever ... */
291\& }
2eaa1526 292\&
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293\& /* Don't want any retries */
294\& SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
2eaa1526 295\&
984263bc 296\& /* We might want to do other things with ssl here */
2eaa1526 297\&
984263bc 298\& BIO_set_conn_hostname(sbio, "localhost:https");
2eaa1526 299\&
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300\& out = BIO_new_fp(stdout, BIO_NOCLOSE);
301\& if(BIO_do_connect(sbio) <= 0) {
302\& fprintf(stderr, "Error connecting to server\en");
303\& ERR_print_errors_fp(stderr);
304\& /* whatever ... */
305\& }
2eaa1526 306\&
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307\& if(BIO_do_handshake(sbio) <= 0) {
308\& fprintf(stderr, "Error establishing SSL connection\en");
309\& ERR_print_errors_fp(stderr);
310\& /* whatever ... */
311\& }
2eaa1526 312\&
984263bc 313\& /* Could examine ssl here to get connection info */
2eaa1526 314\&
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315\& BIO_puts(sbio, "GET / HTTP/1.0\en\en");
316\& for(;;) {
317\& len = BIO_read(sbio, tmpbuf, 1024);
318\& if(len <= 0) break;
319\& BIO_write(out, tmpbuf, len);
320\& }
321\& BIO_free_all(sbio);
322\& BIO_free(out);
323.Ve
8b0cefbb 324.PP
984263bc 325Here is a simple server example. It makes use of a buffering
8b0cefbb 326\&\s-1BIO\s0 to allow lines to be read from the \s-1SSL\s0 \s-1BIO\s0 using BIO_gets.
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327It creates a pseudo web page containing the actual request from
328a client and also echoes the request to standard output.
329.PP
330.Vb 5
331\& BIO *sbio, *bbio, *acpt, *out;
332\& int len;
333\& char tmpbuf[1024];
334\& SSL_CTX *ctx;
335\& SSL *ssl;
2eaa1526 336\&
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337\& ERR_load_crypto_strings();
338\& ERR_load_SSL_strings();
339\& OpenSSL_add_all_algorithms();
2eaa1526 340\&
984263bc 341\& /* Might seed PRNG here */
2eaa1526 342\&
984263bc 343\& ctx = SSL_CTX_new(SSLv23_server_method());
2eaa1526 344\&
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345\& if (!SSL_CTX_use_certificate_file(ctx,"server.pem",SSL_FILETYPE_PEM)
346\& || !SSL_CTX_use_PrivateKey_file(ctx,"server.pem",SSL_FILETYPE_PEM)
347\& || !SSL_CTX_check_private_key(ctx)) {
2eaa1526 348\&
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349\& fprintf(stderr, "Error setting up SSL_CTX\en");
350\& ERR_print_errors_fp(stderr);
351\& return 0;
352\& }
2eaa1526 353\&
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354\& /* Might do other things here like setting verify locations and
355\& * DH and/or RSA temporary key callbacks
356\& */
2eaa1526 357\&
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358\& /* New SSL BIO setup as server */
359\& sbio=BIO_new_ssl(ctx,0);
2eaa1526 360\&
984263bc 361\& BIO_get_ssl(sbio, &ssl);
2eaa1526 362\&
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363\& if(!ssl) {
364\& fprintf(stderr, "Can't locate SSL pointer\en");
365\& /* whatever ... */
366\& }
2eaa1526 367\&
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368\& /* Don't want any retries */
369\& SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
2eaa1526 370\&
984263bc 371\& /* Create the buffering BIO */
2eaa1526 372\&
984263bc 373\& bbio = BIO_new(BIO_f_buffer());
2eaa1526 374\&
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375\& /* Add to chain */
376\& sbio = BIO_push(bbio, sbio);
2eaa1526 377\&
984263bc 378\& acpt=BIO_new_accept("4433");
2eaa1526 379\&
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380\& /* By doing this when a new connection is established
381\& * we automatically have sbio inserted into it. The
382\& * BIO chain is now 'swallowed' by the accept BIO and
383\& * will be freed when the accept BIO is freed.
384\& */
2eaa1526 385\&
984263bc 386\& BIO_set_accept_bios(acpt,sbio);
2eaa1526 387\&
984263bc 388\& out = BIO_new_fp(stdout, BIO_NOCLOSE);
2eaa1526 389\&
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390\& /* Setup accept BIO */
391\& if(BIO_do_accept(acpt) <= 0) {
392\& fprintf(stderr, "Error setting up accept BIO\en");
393\& ERR_print_errors_fp(stderr);
394\& return 0;
395\& }
2eaa1526 396\&
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397\& /* Now wait for incoming connection */
398\& if(BIO_do_accept(acpt) <= 0) {
399\& fprintf(stderr, "Error in connection\en");
400\& ERR_print_errors_fp(stderr);
401\& return 0;
402\& }
2eaa1526 403\&
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404\& /* We only want one connection so remove and free
405\& * accept BIO
406\& */
2eaa1526 407\&
984263bc 408\& sbio = BIO_pop(acpt);
2eaa1526 409\&
984263bc 410\& BIO_free_all(acpt);
2eaa1526 411\&
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412\& if(BIO_do_handshake(sbio) <= 0) {
413\& fprintf(stderr, "Error in SSL handshake\en");
414\& ERR_print_errors_fp(stderr);
415\& return 0;
416\& }
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417\&
418\& BIO_puts(sbio, "HTTP/1.0 200 OK\er\enContent\-type: text/plain\er\en\er\en");
74dab6c2 419\& BIO_puts(sbio, "\er\enConnection Established\er\enRequest headers:\er\en");
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420\& BIO_puts(sbio, "\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\er\en");
421\&
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422\& for(;;) {
423\& len = BIO_gets(sbio, tmpbuf, 1024);
424\& if(len <= 0) break;
425\& BIO_write(sbio, tmpbuf, len);
426\& BIO_write(out, tmpbuf, len);
427\& /* Look for blank line signifying end of headers*/
428\& if((tmpbuf[0] == '\er') || (tmpbuf[0] == '\en')) break;
429\& }
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PA
430\&
431\& BIO_puts(sbio, "\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\er\en");
74dab6c2 432\& BIO_puts(sbio, "\er\en");
2eaa1526 433\&
984263bc
MD
434\& /* Since there is a buffering BIO present we had better flush it */
435\& BIO_flush(sbio);
2eaa1526 436\&
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MD
437\& BIO_free_all(sbio);
438.Ve
439.SH "SEE ALSO"
440.IX Header "SEE ALSO"
8b0cefbb 441\&\s-1TBA\s0