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Test Your Knowledge in Computers #214
Difficulty: Easy
Cisco Internetwork Operating System (IOS) is a family of network operating systems used on many Cisco Systems routers and current Cisco network switches originally designed by Sun Microsystems.
True or False?
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ssl_get_version(3ssl) [bsd man page]

SSL_get_version(3SSL)						      OpenSSL						     SSL_get_version(3SSL)

NAME
SSL_get_version - get the protocol version of a connection. SYNOPSIS
#include <openssl/ssl.h> const char *SSL_get_version(const SSL *ssl); DESCRIPTION
SSL_get_cipher_version() returns the name of the protocol used for the connection ssl. RETURN VALUES
The following strings can occur: SSLv2 The connection uses the SSLv2 protocol. SSLv3 The connection uses the SSLv3 protocol. TLSv1 The connection uses the TLSv1 protocol. unknown This indicates that no version has been set (no connection established). SEE ALSO
ssl(3) 1.0.1e 2013-02-11 SSL_get_version(3SSL)

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SSL_CTX_new(3SSL)						      OpenSSL							 SSL_CTX_new(3SSL)

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(const 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 understand 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) 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 compatibility 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) 1.0.1e 2013-02-11 SSL_CTX_new(3SSL)

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