Merge branch 'vendor/OPENSSL'
[dragonfly.git] / secure / lib / libcrypto / man / BIO_f_ssl.3
CommitLineData
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132.\" ========================================================================
133.\"
134.IX Title "BIO_f_ssl 3"
fc468453 135.TH BIO_f_ssl 3 "2010-02-27" "0.9.8m" "OpenSSL"
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136.\" For nroff, turn off justification. Always turn off hyphenation; it makes
137.\" way too many mistakes in technical documents.
138.if n .ad l
139.nh
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140.SH "NAME"
141BIO_f_ssl, BIO_set_ssl, BIO_get_ssl, BIO_set_ssl_mode, BIO_set_ssl_renegotiate_bytes,
142BIO_get_num_renegotiates, BIO_set_ssl_renegotiate_timeout, BIO_new_ssl,
143BIO_new_ssl_connect, BIO_new_buffer_ssl_connect, BIO_ssl_copy_session_id,
74dab6c2 144BIO_ssl_shutdown \- SSL BIO
984263bc 145.SH "SYNOPSIS"
8b0cefbb 146.IX Header "SYNOPSIS"
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147.Vb 2
148\& #include <openssl/bio.h>
149\& #include <openssl/ssl.h>
e257b235 150\&
984263bc 151\& BIO_METHOD *BIO_f_ssl(void);
e257b235 152\&
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153\& #define BIO_set_ssl(b,ssl,c) BIO_ctrl(b,BIO_C_SET_SSL,c,(char *)ssl)
154\& #define BIO_get_ssl(b,sslp) BIO_ctrl(b,BIO_C_GET_SSL,0,(char *)sslp)
155\& #define BIO_set_ssl_mode(b,client) BIO_ctrl(b,BIO_C_SSL_MODE,client,NULL)
156\& #define BIO_set_ssl_renegotiate_bytes(b,num) \e
157\& BIO_ctrl(b,BIO_C_SET_SSL_RENEGOTIATE_BYTES,num,NULL);
158\& #define BIO_set_ssl_renegotiate_timeout(b,seconds) \e
159\& BIO_ctrl(b,BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT,seconds,NULL);
160\& #define BIO_get_num_renegotiates(b) \e
161\& BIO_ctrl(b,BIO_C_SET_SSL_NUM_RENEGOTIATES,0,NULL);
e257b235 162\&
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163\& BIO *BIO_new_ssl(SSL_CTX *ctx,int client);
164\& BIO *BIO_new_ssl_connect(SSL_CTX *ctx);
165\& BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx);
166\& int BIO_ssl_copy_session_id(BIO *to,BIO *from);
167\& void BIO_ssl_shutdown(BIO *bio);
e257b235 168\&
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169\& #define BIO_do_handshake(b) BIO_ctrl(b,BIO_C_DO_STATE_MACHINE,0,NULL)
170.Ve
171.SH "DESCRIPTION"
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172.IX Header "DESCRIPTION"
173\&\fIBIO_f_ssl()\fR returns the \s-1SSL\s0 \s-1BIO\s0 method. This is a filter \s-1BIO\s0 which
174is a wrapper round the OpenSSL \s-1SSL\s0 routines adding a \s-1BIO\s0 \*(L"flavour\*(R" to
e257b235 175\&\s-1SSL\s0 I/O.
984263bc 176.PP
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177I/O performed on an \s-1SSL\s0 \s-1BIO\s0 communicates using the \s-1SSL\s0 protocol with
178the SSLs read and write BIOs. If an \s-1SSL\s0 connection is not established
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179then an attempt is made to establish one on the first I/O call.
180.PP
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181If a \s-1BIO\s0 is appended to an \s-1SSL\s0 \s-1BIO\s0 using \fIBIO_push()\fR it is automatically
182used as the \s-1SSL\s0 BIOs read and write BIOs.
984263bc 183.PP
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184Calling \fIBIO_reset()\fR on an \s-1SSL\s0 \s-1BIO\s0 closes down any current \s-1SSL\s0 connection
185by calling \fISSL_shutdown()\fR. \fIBIO_reset()\fR is then sent to the next \s-1BIO\s0 in
984263bc 186the chain: this will typically disconnect the underlying transport.
8b0cefbb 187The \s-1SSL\s0 \s-1BIO\s0 is then reset to the initial accept or connect state.
984263bc 188.PP
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189If the close flag is set when an \s-1SSL\s0 \s-1BIO\s0 is freed then the internal
190\&\s-1SSL\s0 structure is also freed using \fISSL_free()\fR.
984263bc 191.PP
8b0cefbb 192\&\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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193the close flag \fBc\fR.
194.PP
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195\&\fIBIO_get_ssl()\fR retrieves the \s-1SSL\s0 pointer of \s-1BIO\s0 \fBb\fR, it can then be
196manipulated using the standard \s-1SSL\s0 library functions.
984263bc 197.PP
8b0cefbb 198\&\fIBIO_set_ssl_mode()\fR sets the \s-1SSL\s0 \s-1BIO\s0 mode to \fBclient\fR. If \fBclient\fR
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199is 1 client mode is set. If \fBclient\fR is 0 server mode is set.
200.PP
8b0cefbb 201\&\fIBIO_set_ssl_renegotiate_bytes()\fR sets the renegotiate byte count
984263bc 202to \fBnum\fR. When set after every \fBnum\fR bytes of I/O (read and write)
8b0cefbb 203the \s-1SSL\s0 session is automatically renegotiated. \fBnum\fR must be at
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204least 512 bytes.
205.PP
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206\&\fIBIO_set_ssl_renegotiate_timeout()\fR sets the renegotiate timeout to
207\&\fBseconds\fR. When the renegotiate timeout elapses the session is
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208automatically renegotiated.
209.PP
8b0cefbb 210\&\fIBIO_get_num_renegotiates()\fR returns the total number of session
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211renegotiations due to I/O or timeout.
212.PP
8b0cefbb 213\&\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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214client mode if \fBclient\fR is non zero.
215.PP
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216\&\fIBIO_new_ssl_connect()\fR creates a new \s-1BIO\s0 chain consisting of an
217\&\s-1SSL\s0 \s-1BIO\s0 (using \fBctx\fR) followed by a connect \s-1BIO\s0.
984263bc 218.PP
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219\&\fIBIO_new_buffer_ssl_connect()\fR creates a new \s-1BIO\s0 chain consisting
220of a buffering \s-1BIO\s0, an \s-1SSL\s0 \s-1BIO\s0 (using \fBctx\fR) and a connect
221\&\s-1BIO\s0.
984263bc 222.PP
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223\&\fIBIO_ssl_copy_session_id()\fR copies an \s-1SSL\s0 session id between
224\&\s-1BIO\s0 chains \fBfrom\fR and \fBto\fR. It does this by locating the
225\&\s-1SSL\s0 BIOs in each chain and calling \fISSL_copy_session_id()\fR on
226the internal \s-1SSL\s0 pointer.
984263bc 227.PP
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228\&\fIBIO_ssl_shutdown()\fR closes down an \s-1SSL\s0 connection on \s-1BIO\s0
229chain \fBbio\fR. It does this by locating the \s-1SSL\s0 \s-1BIO\s0 in the
230chain and calling \fISSL_shutdown()\fR on its internal \s-1SSL\s0
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231pointer.
232.PP
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233\&\fIBIO_do_handshake()\fR attempts to complete an \s-1SSL\s0 handshake on the
234supplied \s-1BIO\s0 and establish the \s-1SSL\s0 connection. It returns 1
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235if the connection was established successfully. A zero or negative
236value is returned if the connection could not be established, the
237call \fIBIO_should_retry()\fR should be used for non blocking connect BIOs
8b0cefbb 238to determine if the call should be retried. If an \s-1SSL\s0 connection has
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239already been established this call has no effect.
240.SH "NOTES"
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241.IX Header "NOTES"
242\&\s-1SSL\s0 BIOs are exceptional in that if the underlying transport
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243is non blocking they can still request a retry in exceptional
244circumstances. Specifically this will happen if a session
245renegotiation takes place during a \fIBIO_read()\fR operation, one
8b0cefbb 246case where this happens is when \s-1SGC\s0 or step up occurs.
984263bc 247.PP
8b0cefbb 248In OpenSSL 0.9.6 and later the \s-1SSL\s0 flag \s-1SSL_AUTO_RETRY\s0 can be
984263bc 249set to disable this behaviour. That is when this flag is set
8b0cefbb 250an \s-1SSL\s0 \s-1BIO\s0 using a blocking transport will never request a
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251retry.
252.PP
253Since unknown \fIBIO_ctrl()\fR operations are sent through filter
254BIOs the servers name and port can be set using \fIBIO_set_host()\fR
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255on the \s-1BIO\s0 returned by \fIBIO_new_ssl_connect()\fR without having
256to locate the connect \s-1BIO\s0 first.
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257.PP
258Applications do not have to call \fIBIO_do_handshake()\fR but may wish
259to do so to separate the handshake process from other I/O
260processing.
261.SH "RETURN VALUES"
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262.IX Header "RETURN VALUES"
263\&\s-1TBA\s0
984263bc 264.SH "EXAMPLE"
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265.IX Header "EXAMPLE"
266This \s-1SSL/TLS\s0 client example, attempts to retrieve a page from an
267\&\s-1SSL/TLS\s0 web server. The I/O routines are identical to those of the
268unencrypted example in \fIBIO_s_connect\fR\|(3).
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269.PP
270.Vb 5
271\& BIO *sbio, *out;
272\& int len;
273\& char tmpbuf[1024];
274\& SSL_CTX *ctx;
275\& SSL *ssl;
e257b235 276\&
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277\& ERR_load_crypto_strings();
278\& ERR_load_SSL_strings();
279\& OpenSSL_add_all_algorithms();
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280\&
281\& /* We would seed the PRNG here if the platform didn\*(Aqt
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282\& * do it automatically
283\& */
e257b235 284\&
984263bc 285\& ctx = SSL_CTX_new(SSLv23_client_method());
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286\&
287\& /* We\*(Aqd normally set some stuff like the verify paths and
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288\& * mode here because as things stand this will connect to
289\& * any server whose certificate is signed by any CA.
290\& */
e257b235 291\&
984263bc 292\& sbio = BIO_new_ssl_connect(ctx);
e257b235 293\&
984263bc 294\& BIO_get_ssl(sbio, &ssl);
e257b235 295\&
984263bc 296\& if(!ssl) {
e257b235 297\& fprintf(stderr, "Can\*(Aqt locate SSL pointer\en");
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298\& /* whatever ... */
299\& }
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300\&
301\& /* Don\*(Aqt want any retries */
984263bc 302\& SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
e257b235 303\&
984263bc 304\& /* We might want to do other things with ssl here */
e257b235 305\&
984263bc 306\& BIO_set_conn_hostname(sbio, "localhost:https");
e257b235 307\&
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308\& out = BIO_new_fp(stdout, BIO_NOCLOSE);
309\& if(BIO_do_connect(sbio) <= 0) {
310\& fprintf(stderr, "Error connecting to server\en");
311\& ERR_print_errors_fp(stderr);
312\& /* whatever ... */
313\& }
e257b235 314\&
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315\& if(BIO_do_handshake(sbio) <= 0) {
316\& fprintf(stderr, "Error establishing SSL connection\en");
317\& ERR_print_errors_fp(stderr);
318\& /* whatever ... */
319\& }
e257b235 320\&
984263bc 321\& /* Could examine ssl here to get connection info */
e257b235 322\&
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323\& BIO_puts(sbio, "GET / HTTP/1.0\en\en");
324\& for(;;) {
325\& len = BIO_read(sbio, tmpbuf, 1024);
326\& if(len <= 0) break;
327\& BIO_write(out, tmpbuf, len);
328\& }
329\& BIO_free_all(sbio);
330\& BIO_free(out);
331.Ve
8b0cefbb 332.PP
984263bc 333Here is a simple server example. It makes use of a buffering
8b0cefbb 334\&\s-1BIO\s0 to allow lines to be read from the \s-1SSL\s0 \s-1BIO\s0 using BIO_gets.
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335It creates a pseudo web page containing the actual request from
336a client and also echoes the request to standard output.
337.PP
338.Vb 5
339\& BIO *sbio, *bbio, *acpt, *out;
340\& int len;
341\& char tmpbuf[1024];
342\& SSL_CTX *ctx;
343\& SSL *ssl;
e257b235 344\&
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345\& ERR_load_crypto_strings();
346\& ERR_load_SSL_strings();
347\& OpenSSL_add_all_algorithms();
e257b235 348\&
984263bc 349\& /* Might seed PRNG here */
e257b235 350\&
984263bc 351\& ctx = SSL_CTX_new(SSLv23_server_method());
e257b235 352\&
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353\& if (!SSL_CTX_use_certificate_file(ctx,"server.pem",SSL_FILETYPE_PEM)
354\& || !SSL_CTX_use_PrivateKey_file(ctx,"server.pem",SSL_FILETYPE_PEM)
355\& || !SSL_CTX_check_private_key(ctx)) {
e257b235 356\&
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357\& fprintf(stderr, "Error setting up SSL_CTX\en");
358\& ERR_print_errors_fp(stderr);
359\& return 0;
360\& }
e257b235 361\&
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362\& /* Might do other things here like setting verify locations and
363\& * DH and/or RSA temporary key callbacks
364\& */
e257b235 365\&
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366\& /* New SSL BIO setup as server */
367\& sbio=BIO_new_ssl(ctx,0);
e257b235 368\&
984263bc 369\& BIO_get_ssl(sbio, &ssl);
e257b235 370\&
984263bc 371\& if(!ssl) {
e257b235 372\& fprintf(stderr, "Can\*(Aqt locate SSL pointer\en");
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373\& /* whatever ... */
374\& }
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375\&
376\& /* Don\*(Aqt want any retries */
984263bc 377\& SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
e257b235 378\&
984263bc 379\& /* Create the buffering BIO */
e257b235 380\&
984263bc 381\& bbio = BIO_new(BIO_f_buffer());
e257b235 382\&
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383\& /* Add to chain */
384\& sbio = BIO_push(bbio, sbio);
e257b235 385\&
984263bc 386\& acpt=BIO_new_accept("4433");
e257b235 387\&
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388\& /* By doing this when a new connection is established
389\& * we automatically have sbio inserted into it. The
e257b235 390\& * BIO chain is now \*(Aqswallowed\*(Aq by the accept BIO and
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391\& * will be freed when the accept BIO is freed.
392\& */
e257b235 393\&
984263bc 394\& BIO_set_accept_bios(acpt,sbio);
e257b235 395\&
984263bc 396\& out = BIO_new_fp(stdout, BIO_NOCLOSE);
e257b235 397\&
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398\& /* Setup accept BIO */
399\& if(BIO_do_accept(acpt) <= 0) {
400\& fprintf(stderr, "Error setting up accept BIO\en");
401\& ERR_print_errors_fp(stderr);
402\& return 0;
403\& }
e257b235 404\&
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405\& /* Now wait for incoming connection */
406\& if(BIO_do_accept(acpt) <= 0) {
407\& fprintf(stderr, "Error in connection\en");
408\& ERR_print_errors_fp(stderr);
409\& return 0;
410\& }
e257b235 411\&
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412\& /* We only want one connection so remove and free
413\& * accept BIO
414\& */
e257b235 415\&
984263bc 416\& sbio = BIO_pop(acpt);
e257b235 417\&
984263bc 418\& BIO_free_all(acpt);
e257b235 419\&
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420\& if(BIO_do_handshake(sbio) <= 0) {
421\& fprintf(stderr, "Error in SSL handshake\en");
422\& ERR_print_errors_fp(stderr);
423\& return 0;
424\& }
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425\&
426\& BIO_puts(sbio, "HTTP/1.0 200 OK\er\enContent\-type: text/plain\er\en\er\en");
74dab6c2 427\& BIO_puts(sbio, "\er\enConnection Established\er\enRequest headers:\er\en");
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428\& BIO_puts(sbio, "\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\er\en");
429\&
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430\& for(;;) {
431\& len = BIO_gets(sbio, tmpbuf, 1024);
432\& if(len <= 0) break;
433\& BIO_write(sbio, tmpbuf, len);
434\& BIO_write(out, tmpbuf, len);
435\& /* Look for blank line signifying end of headers*/
e257b235 436\& if((tmpbuf[0] == \*(Aq\er\*(Aq) || (tmpbuf[0] == \*(Aq\en\*(Aq)) break;
984263bc 437\& }
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438\&
439\& BIO_puts(sbio, "\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\er\en");
74dab6c2 440\& BIO_puts(sbio, "\er\en");
e257b235 441\&
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442\& /* Since there is a buffering BIO present we had better flush it */
443\& BIO_flush(sbio);
e257b235 444\&
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445\& BIO_free_all(sbio);
446.Ve
447.SH "SEE ALSO"
448.IX Header "SEE ALSO"
8b0cefbb 449\&\s-1TBA\s0