MirOS Manual: SSL_CTX_new(3)


SSL_CTX_NEW(3)               OpenSSL               SSL_CTX_NEW(3)

NAME

     SSL_CTX_new - create a new SSL_CTX object as framework for
     TLS/SSL enabled functions

SYNOPSIS

      #include <openssl/ssl.h>

      SSL_CTX *SSL_CTX_new(SSL_METHOD *method);

DESCRIPTION

     SSL_CTX_new() creates a new SSL_CTX object as framework to
     establish TLS/SSL enabled connections.

NOTES

     The SSL_CTX object uses method as connection method. The
     methods exist in a generic type (for client and server use),
     a server only type, and a client only type. method can be of
     the following types:

     SSLv2_method(void), SSLv2_server_method(void),
      SSLv2_client_method(void)
         A TLS/SSL connection established with these methods will
         only understand the SSLv2 protocol. A client will send
         out SSLv2 client hello messages and will also indicate
         that it only understand SSLv2. A server will only under-
         stand SSLv2 client hello messages.

     SSLv3_method(void), SSLv3_server_method(void),
      SSLv3_client_method(void)
         A TLS/SSL connection established with these methods will
         only understand the SSLv3 protocol. A client will send
         out SSLv3 client hello messages and will indicate that
         it only understands SSLv3. A server will only understand
         SSLv3 client hello messages. This especially means, that
         it will not understand SSLv2 client hello messages which
         are widely used for compatibility reasons, see
         SSLv23_*_method().

     TLSv1_method(void), TLSv1_server_method(void),
      TLSv1_client_method(void)
         A TLS/SSL connection established with these methods will
         only understand the TLSv1 protocol. A client will send
         out TLSv1 client hello messages and will indicate that
         it only understands TLSv1. A server will only understand
         TLSv1 client hello messages. This especially means, that
         it will not understand SSLv2 client hello messages which
         are widely used for compatibility reasons, see
         SSLv23_*_method(). It will also not understand SSLv3
         client hello messages.

     SSLv23_method(void), SSLv23_server_method(void),
      SSLv23_client_method(void)

MirOS BSD #10-current      2005-02-05                           1

SSL_CTX_NEW(3)               OpenSSL               SSL_CTX_NEW(3)

         A TLS/SSL connection established with these methods will
         understand the SSLv2, SSLv3, and TLSv1 protocol. A
         client will send out SSLv2 client hello messages and
         will indicate that it also understands SSLv3 and TLSv1.
         A server will understand SSLv2, SSLv3, and TLSv1 client
         hello messages. This is the best choice when compatibil-
         ity is a concern.

     The list of protocols available can later be limited using
     the SSL_OP_NO_SSLv2, SSL_OP_NO_SSLv3, SSL_OP_NO_TLSv1
     options of the SSL_CTX_set_options() or SSL_set_options()
     functions. Using these options it is possible to choose e.g.
     SSLv23_server_method() and be able to negotiate with all
     possible clients, but to only allow newer protocols like
     SSLv3 or TLSv1.

     SSL_CTX_new() initializes the list of ciphers, the session
     cache setting, the callbacks, the keys and certificates, and
     the options to its default values.

RETURN VALUES

     The following return values can occur:

     NULL
         The creation of a new SSL_CTX object failed. Check the
         error stack to find out the reason.

     Pointer to an SSL_CTX object
         The return value points to an allocated SSL_CTX object.

SEE ALSO

     SSL_CTX_free(3), SSL_accept(3), ssl(3),
     SSL_set_connect_state(3)

MirOS BSD #10-current      2005-02-05                           2

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