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| 123 | .rm #[ #] #H #V #F C |
| 124 | .\" ======================================================================== |
| 125 | .\" |
| 126 | .IX Title "BIO_f_ssl 3" |
| 127 | .TH BIO_f_ssl 3 "2011-09-06" "1.0.0e" "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 |
| 132 | .SH "NAME" |
| 133 | BIO_f_ssl, BIO_set_ssl, BIO_get_ssl, BIO_set_ssl_mode, BIO_set_ssl_renegotiate_bytes, |
| 134 | BIO_get_num_renegotiates, BIO_set_ssl_renegotiate_timeout, BIO_new_ssl, |
| 135 | BIO_new_ssl_connect, BIO_new_buffer_ssl_connect, BIO_ssl_copy_session_id, |
| 136 | BIO_ssl_shutdown \- SSL BIO |
| 137 | .SH "SYNOPSIS" |
| 138 | .IX Header "SYNOPSIS" |
| 139 | .Vb 2 |
| 140 | \& #include <openssl/bio.h> |
| 141 | \& #include <openssl/ssl.h> |
| 142 | \& |
| 143 | \& BIO_METHOD *BIO_f_ssl(void); |
| 144 | \& |
| 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); |
| 154 | \& |
| 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); |
| 160 | \& |
| 161 | \& #define BIO_do_handshake(b) BIO_ctrl(b,BIO_C_DO_STATE_MACHINE,0,NULL) |
| 162 | .Ve |
| 163 | .SH "DESCRIPTION" |
| 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 |
| 166 | is a wrapper round the OpenSSL \s-1SSL\s0 routines adding a \s-1BIO\s0 \*(L"flavour\*(R" to |
| 167 | \&\s-1SSL\s0 I/O. |
| 168 | .PP |
| 169 | I/O performed on an \s-1SSL\s0 \s-1BIO\s0 communicates using the \s-1SSL\s0 protocol with |
| 170 | the SSLs read and write BIOs. If an \s-1SSL\s0 connection is not established |
| 171 | then an attempt is made to establish one on the first I/O call. |
| 172 | .PP |
| 173 | If a \s-1BIO\s0 is appended to an \s-1SSL\s0 \s-1BIO\s0 using \fIBIO_push()\fR it is automatically |
| 174 | used as the \s-1SSL\s0 BIOs read and write BIOs. |
| 175 | .PP |
| 176 | Calling \fIBIO_reset()\fR on an \s-1SSL\s0 \s-1BIO\s0 closes down any current \s-1SSL\s0 connection |
| 177 | by calling \fISSL_shutdown()\fR. \fIBIO_reset()\fR is then sent to the next \s-1BIO\s0 in |
| 178 | the chain: this will typically disconnect the underlying transport. |
| 179 | The \s-1SSL\s0 \s-1BIO\s0 is then reset to the initial accept or connect state. |
| 180 | .PP |
| 181 | If 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. |
| 183 | .PP |
| 184 | \&\fIBIO_set_ssl()\fR sets the internal \s-1SSL\s0 pointer of \s-1BIO\s0 \fBb\fR to \fBssl\fR using |
| 185 | the close flag \fBc\fR. |
| 186 | .PP |
| 187 | \&\fIBIO_get_ssl()\fR retrieves the \s-1SSL\s0 pointer of \s-1BIO\s0 \fBb\fR, it can then be |
| 188 | manipulated using the standard \s-1SSL\s0 library functions. |
| 189 | .PP |
| 190 | \&\fIBIO_set_ssl_mode()\fR sets the \s-1SSL\s0 \s-1BIO\s0 mode to \fBclient\fR. If \fBclient\fR |
| 191 | is 1 client mode is set. If \fBclient\fR is 0 server mode is set. |
| 192 | .PP |
| 193 | \&\fIBIO_set_ssl_renegotiate_bytes()\fR sets the renegotiate byte count |
| 194 | to \fBnum\fR. When set after every \fBnum\fR bytes of I/O (read and write) |
| 195 | the \s-1SSL\s0 session is automatically renegotiated. \fBnum\fR must be at |
| 196 | least 512 bytes. |
| 197 | .PP |
| 198 | \&\fIBIO_set_ssl_renegotiate_timeout()\fR sets the renegotiate timeout to |
| 199 | \&\fBseconds\fR. When the renegotiate timeout elapses the session is |
| 200 | automatically renegotiated. |
| 201 | .PP |
| 202 | \&\fIBIO_get_num_renegotiates()\fR returns the total number of session |
| 203 | renegotiations due to I/O or timeout. |
| 204 | .PP |
| 205 | \&\fIBIO_new_ssl()\fR allocates an \s-1SSL\s0 \s-1BIO\s0 using \s-1SSL_CTX\s0 \fBctx\fR and using |
| 206 | client mode if \fBclient\fR is non zero. |
| 207 | .PP |
| 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. |
| 210 | .PP |
| 211 | \&\fIBIO_new_buffer_ssl_connect()\fR creates a new \s-1BIO\s0 chain consisting |
| 212 | of a buffering \s-1BIO\s0, an \s-1SSL\s0 \s-1BIO\s0 (using \fBctx\fR) and a connect |
| 213 | \&\s-1BIO\s0. |
| 214 | .PP |
| 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 |
| 218 | the internal \s-1SSL\s0 pointer. |
| 219 | .PP |
| 220 | \&\fIBIO_ssl_shutdown()\fR closes down an \s-1SSL\s0 connection on \s-1BIO\s0 |
| 221 | chain \fBbio\fR. It does this by locating the \s-1SSL\s0 \s-1BIO\s0 in the |
| 222 | chain and calling \fISSL_shutdown()\fR on its internal \s-1SSL\s0 |
| 223 | pointer. |
| 224 | .PP |
| 225 | \&\fIBIO_do_handshake()\fR attempts to complete an \s-1SSL\s0 handshake on the |
| 226 | supplied \s-1BIO\s0 and establish the \s-1SSL\s0 connection. It returns 1 |
| 227 | if the connection was established successfully. A zero or negative |
| 228 | value is returned if the connection could not be established, the |
| 229 | call \fIBIO_should_retry()\fR should be used for non blocking connect BIOs |
| 230 | to determine if the call should be retried. If an \s-1SSL\s0 connection has |
| 231 | already been established this call has no effect. |
| 232 | .SH "NOTES" |
| 233 | .IX Header "NOTES" |
| 234 | \&\s-1SSL\s0 BIOs are exceptional in that if the underlying transport |
| 235 | is non blocking they can still request a retry in exceptional |
| 236 | circumstances. Specifically this will happen if a session |
| 237 | renegotiation takes place during a \fIBIO_read()\fR operation, one |
| 238 | case where this happens is when \s-1SGC\s0 or step up occurs. |
| 239 | .PP |
| 240 | In OpenSSL 0.9.6 and later the \s-1SSL\s0 flag \s-1SSL_AUTO_RETRY\s0 can be |
| 241 | set to disable this behaviour. That is when this flag is set |
| 242 | an \s-1SSL\s0 \s-1BIO\s0 using a blocking transport will never request a |
| 243 | retry. |
| 244 | .PP |
| 245 | Since unknown \fIBIO_ctrl()\fR operations are sent through filter |
| 246 | BIOs the servers name and port can be set using \fIBIO_set_host()\fR |
| 247 | on the \s-1BIO\s0 returned by \fIBIO_new_ssl_connect()\fR without having |
| 248 | to locate the connect \s-1BIO\s0 first. |
| 249 | .PP |
| 250 | Applications do not have to call \fIBIO_do_handshake()\fR but may wish |
| 251 | to do so to separate the handshake process from other I/O |
| 252 | processing. |
| 253 | .SH "RETURN VALUES" |
| 254 | .IX Header "RETURN VALUES" |
| 255 | \&\s-1TBA\s0 |
| 256 | .SH "EXAMPLE" |
| 257 | .IX Header "EXAMPLE" |
| 258 | This \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 |
| 260 | unencrypted example in \fIBIO_s_connect\fR\|(3). |
| 261 | .PP |
| 262 | .Vb 5 |
| 263 | \& BIO *sbio, *out; |
| 264 | \& int len; |
| 265 | \& char tmpbuf[1024]; |
| 266 | \& SSL_CTX *ctx; |
| 267 | \& SSL *ssl; |
| 268 | \& |
| 269 | \& ERR_load_crypto_strings(); |
| 270 | \& ERR_load_SSL_strings(); |
| 271 | \& OpenSSL_add_all_algorithms(); |
| 272 | \& |
| 273 | \& /* We would seed the PRNG here if the platform didn\*(Aqt |
| 274 | \& * do it automatically |
| 275 | \& */ |
| 276 | \& |
| 277 | \& ctx = SSL_CTX_new(SSLv23_client_method()); |
| 278 | \& |
| 279 | \& /* We\*(Aqd 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 | \& */ |
| 283 | \& |
| 284 | \& sbio = BIO_new_ssl_connect(ctx); |
| 285 | \& |
| 286 | \& BIO_get_ssl(sbio, &ssl); |
| 287 | \& |
| 288 | \& if(!ssl) { |
| 289 | \& fprintf(stderr, "Can\*(Aqt locate SSL pointer\en"); |
| 290 | \& /* whatever ... */ |
| 291 | \& } |
| 292 | \& |
| 293 | \& /* Don\*(Aqt want any retries */ |
| 294 | \& SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY); |
| 295 | \& |
| 296 | \& /* We might want to do other things with ssl here */ |
| 297 | \& |
| 298 | \& BIO_set_conn_hostname(sbio, "localhost:https"); |
| 299 | \& |
| 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 | \& } |
| 306 | \& |
| 307 | \& if(BIO_do_handshake(sbio) <= 0) { |
| 308 | \& fprintf(stderr, "Error establishing SSL connection\en"); |
| 309 | \& ERR_print_errors_fp(stderr); |
| 310 | \& /* whatever ... */ |
| 311 | \& } |
| 312 | \& |
| 313 | \& /* Could examine ssl here to get connection info */ |
| 314 | \& |
| 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 |
| 324 | .PP |
| 325 | Here is a simple server example. It makes use of a buffering |
| 326 | \&\s-1BIO\s0 to allow lines to be read from the \s-1SSL\s0 \s-1BIO\s0 using BIO_gets. |
| 327 | It creates a pseudo web page containing the actual request from |
| 328 | a 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; |
| 336 | \& |
| 337 | \& ERR_load_crypto_strings(); |
| 338 | \& ERR_load_SSL_strings(); |
| 339 | \& OpenSSL_add_all_algorithms(); |
| 340 | \& |
| 341 | \& /* Might seed PRNG here */ |
| 342 | \& |
| 343 | \& ctx = SSL_CTX_new(SSLv23_server_method()); |
| 344 | \& |
| 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)) { |
| 348 | \& |
| 349 | \& fprintf(stderr, "Error setting up SSL_CTX\en"); |
| 350 | \& ERR_print_errors_fp(stderr); |
| 351 | \& return 0; |
| 352 | \& } |
| 353 | \& |
| 354 | \& /* Might do other things here like setting verify locations and |
| 355 | \& * DH and/or RSA temporary key callbacks |
| 356 | \& */ |
| 357 | \& |
| 358 | \& /* New SSL BIO setup as server */ |
| 359 | \& sbio=BIO_new_ssl(ctx,0); |
| 360 | \& |
| 361 | \& BIO_get_ssl(sbio, &ssl); |
| 362 | \& |
| 363 | \& if(!ssl) { |
| 364 | \& fprintf(stderr, "Can\*(Aqt locate SSL pointer\en"); |
| 365 | \& /* whatever ... */ |
| 366 | \& } |
| 367 | \& |
| 368 | \& /* Don\*(Aqt want any retries */ |
| 369 | \& SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY); |
| 370 | \& |
| 371 | \& /* Create the buffering BIO */ |
| 372 | \& |
| 373 | \& bbio = BIO_new(BIO_f_buffer()); |
| 374 | \& |
| 375 | \& /* Add to chain */ |
| 376 | \& sbio = BIO_push(bbio, sbio); |
| 377 | \& |
| 378 | \& acpt=BIO_new_accept("4433"); |
| 379 | \& |
| 380 | \& /* By doing this when a new connection is established |
| 381 | \& * we automatically have sbio inserted into it. The |
| 382 | \& * BIO chain is now \*(Aqswallowed\*(Aq by the accept BIO and |
| 383 | \& * will be freed when the accept BIO is freed. |
| 384 | \& */ |
| 385 | \& |
| 386 | \& BIO_set_accept_bios(acpt,sbio); |
| 387 | \& |
| 388 | \& out = BIO_new_fp(stdout, BIO_NOCLOSE); |
| 389 | \& |
| 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 | \& } |
| 396 | \& |
| 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 | \& } |
| 403 | \& |
| 404 | \& /* We only want one connection so remove and free |
| 405 | \& * accept BIO |
| 406 | \& */ |
| 407 | \& |
| 408 | \& sbio = BIO_pop(acpt); |
| 409 | \& |
| 410 | \& BIO_free_all(acpt); |
| 411 | \& |
| 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 | \& } |
| 417 | \& |
| 418 | \& BIO_puts(sbio, "HTTP/1.0 200 OK\er\enContent\-type: text/plain\er\en\er\en"); |
| 419 | \& BIO_puts(sbio, "\er\enConnection Established\er\enRequest headers:\er\en"); |
| 420 | \& BIO_puts(sbio, "\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\er\en"); |
| 421 | \& |
| 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] == \*(Aq\er\*(Aq) || (tmpbuf[0] == \*(Aq\en\*(Aq)) break; |
| 429 | \& } |
| 430 | \& |
| 431 | \& BIO_puts(sbio, "\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\er\en"); |
| 432 | \& BIO_puts(sbio, "\er\en"); |
| 433 | \& |
| 434 | \& /* Since there is a buffering BIO present we had better flush it */ |
| 435 | \& BIO_flush(sbio); |
| 436 | \& |
| 437 | \& BIO_free_all(sbio); |
| 438 | .Ve |
| 439 | .SH "BUGS" |
| 440 | .IX Header "BUGS" |
| 441 | In OpenSSL versions before 1.0.0 the \fIBIO_pop()\fR call was handled incorrectly, |
| 442 | the I/O \s-1BIO\s0 reference count was incorrectly incremented (instead of |
| 443 | decremented) and dissociated with the \s-1SSL\s0 \s-1BIO\s0 even if the \s-1SSL\s0 \s-1BIO\s0 was not |
| 444 | explicitly being popped (e.g. a pop higher up the chain). Applications which |
| 445 | included workarounds for this bug (e.g. freeing BIOs more than once) should |
| 446 | be modified to handle this fix or they may free up an already freed \s-1BIO\s0. |
| 447 | .SH "SEE ALSO" |
| 448 | .IX Header "SEE ALSO" |
| 449 | \&\s-1TBA\s0 |