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Diffstat (limited to 'secure/lib/libcrypto/man/BIO_f_ssl.3')
| -rw-r--r-- | secure/lib/libcrypto/man/BIO_f_ssl.3 | 449 |
1 files changed, 449 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/BIO_f_ssl.3 b/secure/lib/libcrypto/man/BIO_f_ssl.3 new file mode 100644 index 0000000..a61959e --- /dev/null +++ b/secure/lib/libcrypto/man/BIO_f_ssl.3 @@ -0,0 +1,449 @@ +.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.23) +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. \*(C+ will +.\" give a nicer C++. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +BIO_f_ssl, BIO_set_ssl, BIO_get_ssl, BIO_set_ssl_mode, BIO_set_ssl_renegotiate_bytes, +BIO_get_num_renegotiates, BIO_set_ssl_renegotiate_timeout, BIO_new_ssl, +BIO_new_ssl_connect, BIO_new_buffer_ssl_connect, BIO_ssl_copy_session_id, +BIO_ssl_shutdown \- SSL BIO +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 2 +\& #include <openssl/bio.h> +\& #include <openssl/ssl.h> +\& +\& BIO_METHOD *BIO_f_ssl(void); +\& +\& #define BIO_set_ssl(b,ssl,c) BIO_ctrl(b,BIO_C_SET_SSL,c,(char *)ssl) +\& #define BIO_get_ssl(b,sslp) BIO_ctrl(b,BIO_C_GET_SSL,0,(char *)sslp) +\& #define BIO_set_ssl_mode(b,client) BIO_ctrl(b,BIO_C_SSL_MODE,client,NULL) +\& #define BIO_set_ssl_renegotiate_bytes(b,num) \e +\& BIO_ctrl(b,BIO_C_SET_SSL_RENEGOTIATE_BYTES,num,NULL); +\& #define BIO_set_ssl_renegotiate_timeout(b,seconds) \e +\& BIO_ctrl(b,BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT,seconds,NULL); +\& #define BIO_get_num_renegotiates(b) \e +\& BIO_ctrl(b,BIO_C_SET_SSL_NUM_RENEGOTIATES,0,NULL); +\& +\& BIO *BIO_new_ssl(SSL_CTX *ctx,int client); +\& BIO *BIO_new_ssl_connect(SSL_CTX *ctx); +\& BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx); +\& int BIO_ssl_copy_session_id(BIO *to,BIO *from); +\& void BIO_ssl_shutdown(BIO *bio); +\& +\& #define BIO_do_handshake(b) BIO_ctrl(b,BIO_C_DO_STATE_MACHINE,0,NULL) +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +\&\fIBIO_f_ssl()\fR returns the \s-1SSL\s0 \s-1BIO\s0 method. This is a filter \s-1BIO\s0 which +is a wrapper round the OpenSSL \s-1SSL\s0 routines adding a \s-1BIO\s0 \*(L"flavour\*(R" to +\&\s-1SSL\s0 I/O. +.PP +I/O performed on an \s-1SSL\s0 \s-1BIO\s0 communicates using the \s-1SSL\s0 protocol with +the SSLs read and write BIOs. If an \s-1SSL\s0 connection is not established +then an attempt is made to establish one on the first I/O call. +.PP +If a \s-1BIO\s0 is appended to an \s-1SSL\s0 \s-1BIO\s0 using \fIBIO_push()\fR it is automatically +used as the \s-1SSL\s0 BIOs read and write BIOs. +.PP +Calling \fIBIO_reset()\fR on an \s-1SSL\s0 \s-1BIO\s0 closes down any current \s-1SSL\s0 connection +by calling \fISSL_shutdown()\fR. \fIBIO_reset()\fR is then sent to the next \s-1BIO\s0 in +the chain: this will typically disconnect the underlying transport. +The \s-1SSL\s0 \s-1BIO\s0 is then reset to the initial accept or connect state. +.PP +If the close flag is set when an \s-1SSL\s0 \s-1BIO\s0 is freed then the internal +\&\s-1SSL\s0 structure is also freed using \fISSL_free()\fR. +.PP +\&\fIBIO_set_ssl()\fR sets the internal \s-1SSL\s0 pointer of \s-1BIO\s0 \fBb\fR to \fBssl\fR using +the close flag \fBc\fR. +.PP +\&\fIBIO_get_ssl()\fR retrieves the \s-1SSL\s0 pointer of \s-1BIO\s0 \fBb\fR, it can then be +manipulated using the standard \s-1SSL\s0 library functions. +.PP +\&\fIBIO_set_ssl_mode()\fR sets the \s-1SSL\s0 \s-1BIO\s0 mode to \fBclient\fR. If \fBclient\fR +is 1 client mode is set. If \fBclient\fR is 0 server mode is set. +.PP +\&\fIBIO_set_ssl_renegotiate_bytes()\fR sets the renegotiate byte count +to \fBnum\fR. When set after every \fBnum\fR bytes of I/O (read and write) +the \s-1SSL\s0 session is automatically renegotiated. \fBnum\fR must be at +least 512 bytes. +.PP +\&\fIBIO_set_ssl_renegotiate_timeout()\fR sets the renegotiate timeout to +\&\fBseconds\fR. When the renegotiate timeout elapses the session is +automatically renegotiated. +.PP +\&\fIBIO_get_num_renegotiates()\fR returns the total number of session +renegotiations due to I/O or timeout. +.PP +\&\fIBIO_new_ssl()\fR allocates an \s-1SSL\s0 \s-1BIO\s0 using \s-1SSL_CTX\s0 \fBctx\fR and using +client mode if \fBclient\fR is non zero. +.PP +\&\fIBIO_new_ssl_connect()\fR creates a new \s-1BIO\s0 chain consisting of an +\&\s-1SSL\s0 \s-1BIO\s0 (using \fBctx\fR) followed by a connect \s-1BIO\s0. +.PP +\&\fIBIO_new_buffer_ssl_connect()\fR creates a new \s-1BIO\s0 chain consisting +of a buffering \s-1BIO\s0, an \s-1SSL\s0 \s-1BIO\s0 (using \fBctx\fR) and a connect +\&\s-1BIO\s0. +.PP +\&\fIBIO_ssl_copy_session_id()\fR copies an \s-1SSL\s0 session id between +\&\s-1BIO\s0 chains \fBfrom\fR and \fBto\fR. It does this by locating the +\&\s-1SSL\s0 BIOs in each chain and calling \fISSL_copy_session_id()\fR on +the internal \s-1SSL\s0 pointer. +.PP +\&\fIBIO_ssl_shutdown()\fR closes down an \s-1SSL\s0 connection on \s-1BIO\s0 +chain \fBbio\fR. It does this by locating the \s-1SSL\s0 \s-1BIO\s0 in the +chain and calling \fISSL_shutdown()\fR on its internal \s-1SSL\s0 +pointer. +.PP +\&\fIBIO_do_handshake()\fR attempts to complete an \s-1SSL\s0 handshake on the +supplied \s-1BIO\s0 and establish the \s-1SSL\s0 connection. It returns 1 +if the connection was established successfully. A zero or negative +value is returned if the connection could not be established, the +call \fIBIO_should_retry()\fR should be used for non blocking connect BIOs +to determine if the call should be retried. If an \s-1SSL\s0 connection has +already been established this call has no effect. +.SH "NOTES" +.IX Header "NOTES" +\&\s-1SSL\s0 BIOs are exceptional in that if the underlying transport +is non blocking they can still request a retry in exceptional +circumstances. Specifically this will happen if a session +renegotiation takes place during a \fIBIO_read()\fR operation, one +case where this happens is when \s-1SGC\s0 or step up occurs. +.PP +In OpenSSL 0.9.6 and later the \s-1SSL\s0 flag \s-1SSL_AUTO_RETRY\s0 can be +set to disable this behaviour. That is when this flag is set +an \s-1SSL\s0 \s-1BIO\s0 using a blocking transport will never request a +retry. +.PP +Since unknown \fIBIO_ctrl()\fR operations are sent through filter +BIOs the servers name and port can be set using \fIBIO_set_host()\fR +on the \s-1BIO\s0 returned by \fIBIO_new_ssl_connect()\fR without having +to locate the connect \s-1BIO\s0 first. +.PP +Applications do not have to call \fIBIO_do_handshake()\fR but may wish +to do so to separate the handshake process from other I/O +processing. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\s-1TBA\s0 +.SH "EXAMPLE" +.IX Header "EXAMPLE" +This \s-1SSL/TLS\s0 client example, attempts to retrieve a page from an +\&\s-1SSL/TLS\s0 web server. The I/O routines are identical to those of the +unencrypted example in \fIBIO_s_connect\fR\|(3). +.PP +.Vb 5 +\& BIO *sbio, *out; +\& int len; +\& char tmpbuf[1024]; +\& SSL_CTX *ctx; +\& SSL *ssl; +\& +\& ERR_load_crypto_strings(); +\& ERR_load_SSL_strings(); +\& OpenSSL_add_all_algorithms(); +\& +\& /* We would seed the PRNG here if the platform didn\*(Aqt +\& * do it automatically +\& */ +\& +\& ctx = SSL_CTX_new(SSLv23_client_method()); +\& +\& /* We\*(Aqd normally set some stuff like the verify paths and +\& * mode here because as things stand this will connect to +\& * any server whose certificate is signed by any CA. +\& */ +\& +\& sbio = BIO_new_ssl_connect(ctx); +\& +\& BIO_get_ssl(sbio, &ssl); +\& +\& if(!ssl) { +\& fprintf(stderr, "Can\*(Aqt locate SSL pointer\en"); +\& /* whatever ... */ +\& } +\& +\& /* Don\*(Aqt want any retries */ +\& SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY); +\& +\& /* We might want to do other things with ssl here */ +\& +\& BIO_set_conn_hostname(sbio, "localhost:https"); +\& +\& out = BIO_new_fp(stdout, BIO_NOCLOSE); +\& if(BIO_do_connect(sbio) <= 0) { +\& fprintf(stderr, "Error connecting to server\en"); +\& ERR_print_errors_fp(stderr); +\& /* whatever ... */ +\& } +\& +\& if(BIO_do_handshake(sbio) <= 0) { +\& fprintf(stderr, "Error establishing SSL connection\en"); +\& ERR_print_errors_fp(stderr); +\& /* whatever ... */ +\& } +\& +\& /* Could examine ssl here to get connection info */ +\& +\& BIO_puts(sbio, "GET / HTTP/1.0\en\en"); +\& for(;;) { +\& len = BIO_read(sbio, tmpbuf, 1024); +\& if(len <= 0) break; +\& BIO_write(out, tmpbuf, len); +\& } +\& BIO_free_all(sbio); +\& BIO_free(out); +.Ve +.PP +Here is a simple server example. It makes use of a buffering +\&\s-1BIO\s0 to allow lines to be read from the \s-1SSL\s0 \s-1BIO\s0 using BIO_gets. +It creates a pseudo web page containing the actual request from +a client and also echoes the request to standard output. +.PP +.Vb 5 +\& BIO *sbio, *bbio, *acpt, *out; +\& int len; +\& char tmpbuf[1024]; +\& SSL_CTX *ctx; +\& SSL *ssl; +\& +\& ERR_load_crypto_strings(); +\& ERR_load_SSL_strings(); +\& OpenSSL_add_all_algorithms(); +\& +\& /* Might seed PRNG here */ +\& +\& ctx = SSL_CTX_new(SSLv23_server_method()); +\& +\& if (!SSL_CTX_use_certificate_file(ctx,"server.pem",SSL_FILETYPE_PEM) +\& || !SSL_CTX_use_PrivateKey_file(ctx,"server.pem",SSL_FILETYPE_PEM) +\& || !SSL_CTX_check_private_key(ctx)) { +\& +\& fprintf(stderr, "Error setting up SSL_CTX\en"); +\& ERR_print_errors_fp(stderr); +\& return 0; +\& } +\& +\& /* Might do other things here like setting verify locations and +\& * DH and/or RSA temporary key callbacks +\& */ +\& +\& /* New SSL BIO setup as server */ +\& sbio=BIO_new_ssl(ctx,0); +\& +\& BIO_get_ssl(sbio, &ssl); +\& +\& if(!ssl) { +\& fprintf(stderr, "Can\*(Aqt locate SSL pointer\en"); +\& /* whatever ... */ +\& } +\& +\& /* Don\*(Aqt want any retries */ +\& SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY); +\& +\& /* Create the buffering BIO */ +\& +\& bbio = BIO_new(BIO_f_buffer()); +\& +\& /* Add to chain */ +\& sbio = BIO_push(bbio, sbio); +\& +\& acpt=BIO_new_accept("4433"); +\& +\& /* By doing this when a new connection is established +\& * we automatically have sbio inserted into it. The +\& * BIO chain is now \*(Aqswallowed\*(Aq by the accept BIO and +\& * will be freed when the accept BIO is freed. +\& */ +\& +\& BIO_set_accept_bios(acpt,sbio); +\& +\& out = BIO_new_fp(stdout, BIO_NOCLOSE); +\& +\& /* Setup accept BIO */ +\& if(BIO_do_accept(acpt) <= 0) { +\& fprintf(stderr, "Error setting up accept BIO\en"); +\& ERR_print_errors_fp(stderr); +\& return 0; +\& } +\& +\& /* Now wait for incoming connection */ +\& if(BIO_do_accept(acpt) <= 0) { +\& fprintf(stderr, "Error in connection\en"); +\& ERR_print_errors_fp(stderr); +\& return 0; +\& } +\& +\& /* We only want one connection so remove and free +\& * accept BIO +\& */ +\& +\& sbio = BIO_pop(acpt); +\& +\& BIO_free_all(acpt); +\& +\& if(BIO_do_handshake(sbio) <= 0) { +\& fprintf(stderr, "Error in SSL handshake\en"); +\& ERR_print_errors_fp(stderr); +\& return 0; +\& } +\& +\& BIO_puts(sbio, "HTTP/1.0 200 OK\er\enContent\-type: text/plain\er\en\er\en"); +\& BIO_puts(sbio, "\er\enConnection Established\er\enRequest headers:\er\en"); +\& BIO_puts(sbio, "\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\er\en"); +\& +\& for(;;) { +\& len = BIO_gets(sbio, tmpbuf, 1024); +\& if(len <= 0) break; +\& BIO_write(sbio, tmpbuf, len); +\& BIO_write(out, tmpbuf, len); +\& /* Look for blank line signifying end of headers*/ +\& if((tmpbuf[0] == \*(Aq\er\*(Aq) || (tmpbuf[0] == \*(Aq\en\*(Aq)) break; +\& } +\& +\& BIO_puts(sbio, "\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\er\en"); +\& BIO_puts(sbio, "\er\en"); +\& +\& /* Since there is a buffering BIO present we had better flush it */ +\& BIO_flush(sbio); +\& +\& BIO_free_all(sbio); +.Ve +.SH "BUGS" +.IX Header "BUGS" +In OpenSSL versions before 1.0.0 the \fIBIO_pop()\fR call was handled incorrectly, +the I/O \s-1BIO\s0 reference count was incorrectly incremented (instead of +decremented) and dissociated with the \s-1SSL\s0 \s-1BIO\s0 even if the \s-1SSL\s0 \s-1BIO\s0 was not +explicitly being popped (e.g. a pop higher up the chain). Applications which +included workarounds for this bug (e.g. freeing BIOs more than once) should +be modified to handle this fix or they may free up an already freed \s-1BIO\s0. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\s-1TBA\s0 |
