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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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SSL_set_session(3SSL)						      OpenSSL						     SSL_set_session(3SSL)

NAME
SSL_set_session - set a TLS/SSL session to be used during TLS/SSL connect SYNOPSIS
#include <openssl/ssl.h> int SSL_set_session(SSL *ssl, SSL_SESSION *session); DESCRIPTION
SSL_set_session() sets session to be used when the TLS/SSL connection is to be established. SSL_set_session() is only useful for TLS/SSL clients. When the session is set, the reference count of session is incremented by 1. If the session is not reused, the reference count is decremented again during SSL_connect(). Whether the session was reused can be queried with the SSL_session_reused(3) call. If there is already a session set inside ssl (because it was set with SSL_set_session() before or because the same ssl was already used for a connection), SSL_SESSION_free() will be called for that session. NOTES
SSL_SESSION objects keep internal link information about the session cache list, when being inserted into one SSL_CTX object's session cache. One SSL_SESSION object, regardless of its reference count, must therefore only be used with one SSL_CTX object (and the SSL objects created from this SSL_CTX object). RETURN VALUES
The following return values can occur: 0 The operation failed; check the error stack to find out the reason. 1 The operation succeeded. SEE ALSO
ssl(3), SSL_SESSION_free(3), SSL_get_session(3), SSL_session_reused(3), SSL_CTX_set_session_cache_mode(3) 1.0.1e 2013-02-11 SSL_set_session(3SSL)
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