05-08-2019
What, then, are the allowed ciphers according to sshd_config?
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LEARN ABOUT REDHAT
ssl_ctx_set_cipher_list
SSL_CTX_set_cipher_list(3) OpenSSL SSL_CTX_set_cipher_list(3)
NAME
SSL_CTX_set_cipher_list, SSL_set_cipher_list - choose list of available SSL_CIPHERs
SYNOPSIS
#include <openssl/ssl.h>
int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str);
int SSL_set_cipher_list(SSL *ssl, const char *str);
DESCRIPTION
SSL_CTX_set_cipher_list() sets the list of available ciphers for ctx using the control string str. The format of the string is described in
ciphers(1). The list of ciphers is inherited by all ssl objects created from ctx.
SSL_set_cipher_list() sets the list of ciphers only for ssl.
NOTES
The control string str should be universally usable and not depend on details of the library configuration (ciphers compiled in). Thus no
syntax checking takes place. Items that are not recognized, because the corresponding ciphers are not compiled in or because they are
mistyped, are simply ignored. Failure is only flagged if no ciphers could be collected at all.
It should be noted, that inclusion of a cipher to be used into the list is a necessary condition. On the client side, the inclusion into
the list is also sufficient. On the server side, additional restrictions apply. All ciphers have additional requirements. ADH ciphers don't
need a certificate, but DH-parameters must have been set. All other ciphers need a corresponding certificate and key.
A RSA cipher can only be chosen, when a RSA certificate is available. RSA export ciphers with a keylength of 512 bits for the RSA key
require a temporary 512 bit RSA key, as typically the supplied key has a length of 1024 bit (see SSL_CTX_set_tmp_rsa_callback(3)). RSA
ciphers using EDH need a certificate and key and additional DH-parameters (see SSL_CTX_set_tmp_dh_callback(3)).
A DSA cipher can only be chosen, when a DSA certificate is available. DSA ciphers always use DH key exchange and therefore need DH-parame-
ters (see SSL_CTX_set_tmp_dh_callback(3)).
When these conditions are not met for any cipher in the list (e.g. a client only supports export RSA ciphers with a asymmetric key length
of 512 bits and the server is not configured to use temporary RSA keys), the "no shared cipher" (SSL_R_NO_SHARED_CIPHER) error is generated
and the handshake will fail.
RETURN VALUES
SSL_CTX_set_cipher_list() and SSL_set_cipher_list() return 1 if any cipher could be selected and 0 on complete failure.
SEE ALSO
ssl(3), SSL_get_ciphers(3), SSL_CTX_use_certificate(3), SSL_CTX_set_tmp_rsa_callback(3), SSL_CTX_set_tmp_dh_callback(3), ciphers(1)
0.9.7a 2001-07-23 SSL_CTX_set_cipher_list(3)