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Full Discussion: implicit ssl vs explicit ssl
Top Forums UNIX for Advanced & Expert Users implicit ssl vs explicit ssl Post 80146 by Perderabo on Wednesday 3rd of August 2005 03:01:30 PM
Old 08-03-2005
With explicit ssl you connect to the standard ftp port (23). Then the client sends an AUTH TLS or AUTH TLS-C command to switch the session into ssl mode. If the client does not send that command, you get an ordinary ftp session. This switches the control connection into ssl mode. And a PROT P command is used to to run ssl on the data connection. This client is in complete control.

With implicit ssl, you connect to port 990. Any ftp server on that port will automatically be in ssl mode. This is like https running on a different port.

There is also a half-and-half. Connect on port 23 and use AUTH SSL to explicitly switch the control connection into ssl mode. The data connection will implicitly be in ssl mode with no explicit command required.

rfc 2228
 

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LEARN ABOUT PHP

ssl_set_bio

SSL_set_bio(3SSL)                                                     OpenSSL                                                    SSL_set_bio(3SSL)

NAME

       SSL_set_bio - connect the SSL object with a BIO

SYNOPSIS

        #include <openssl/ssl.h>

        void SSL_set_bio(SSL *ssl, BIO *rbio, BIO *wbio);

DESCRIPTION

       SSL_set_bio() connects the BIOs rbio and wbio for the read and write operations of the TLS/SSL (encrypted) side of ssl.

       The SSL engine inherits the behaviour of rbio and wbio, respectively.  If a BIO is non-blocking, the ssl will also have non-blocking
       behaviour.

       If there was already a BIO connected to ssl, BIO_free() will be called (for both the reading and writing side, if different).

RETURN VALUES

       SSL_set_bio() cannot fail.

SEE ALSO

       SSL_get_rbio(3), SSL_connect(3), SSL_accept(3), SSL_shutdown(3), ssl(3), bio(3)

1.0.1e                                                              2013-02-11                                                   SSL_set_bio(3SSL)
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