| SSL_CTX_set_options.pod (76866) | SSL_CTX_set_options.pod (89837) |
|---|---|
| 1=pod 2 3=head1 NAME 4 5SSL_CTX_set_options, SSL_set_options, SSL_CTX_get_options, SSL_get_options - manipulate SSL engine options 6 7=head1 SYNOPSIS 8 9 #include <openssl/ssl.h> 10 11 long SSL_CTX_set_options(SSL_CTX *ctx, long options); 12 long SSL_set_options(SSL *ssl, long options); 13 14 long SSL_CTX_get_options(SSL_CTX *ctx); 15 long SSL_get_options(SSL *ssl); 16 17=head1 DESCRIPTION 18 19SSL_CTX_set_options() adds the options set via bitmask in B<options> to B<ctx>. | 1=pod 2 3=head1 NAME 4 5SSL_CTX_set_options, SSL_set_options, SSL_CTX_get_options, SSL_get_options - manipulate SSL engine options 6 7=head1 SYNOPSIS 8 9 #include <openssl/ssl.h> 10 11 long SSL_CTX_set_options(SSL_CTX *ctx, long options); 12 long SSL_set_options(SSL *ssl, long options); 13 14 long SSL_CTX_get_options(SSL_CTX *ctx); 15 long SSL_get_options(SSL *ssl); 16 17=head1 DESCRIPTION 18 19SSL_CTX_set_options() adds the options set via bitmask in B<options> to B<ctx>. |
| 20Options already set before are not cleared. | 20Options already set before are not cleared! |
| 21 22SSL_set_options() adds the options set via bitmask in B<options> to B<ssl>. | 21 22SSL_set_options() adds the options set via bitmask in B<options> to B<ssl>. |
| 23Options already set before are not cleared. | 23Options already set before are not cleared! |
| 24 25SSL_CTX_get_options() returns the options set for B<ctx>. 26 27SSL_get_options() returns the options set for B<ssl>. 28 29=head1 NOTES 30 31The behaviour of the SSL library can be changed by setting several options. 32The options are coded as bitmasks and can be combined by a logical B<or> 33operation (|). Options can only be added but can never be reset. 34 | 24 25SSL_CTX_get_options() returns the options set for B<ctx>. 26 27SSL_get_options() returns the options set for B<ssl>. 28 29=head1 NOTES 30 31The behaviour of the SSL library can be changed by setting several options. 32The options are coded as bitmasks and can be combined by a logical B<or> 33operation (|). Options can only be added but can never be reset. 34 |
| 35During a handshake, the option settings of the SSL object used. When | 35SSL_CTX_set_options() and SSL_set_options() affect the (external) 36protocol behaviour of the SSL library. The (internal) behaviour of 37the API can be changed by using the similar 38L<SSL_CTX_set_modes(3)|SSL_CTX_set_modes(3)> and SSL_set_modes() functions. 39 40During a handshake, the option settings of the SSL object are used. When |
| 36a new SSL object is created from a context using SSL_new(), the current 37option setting is copied. Changes to B<ctx> do not affect already created 38SSL objects. SSL_clear() does not affect the settings. 39 40The following B<bug workaround> options are available: 41 42=over 4 43 --- 73 unchanged lines hidden (view full) --- 117options. 118 119The following B<modifying> options are available: 120 121=over 4 122 123=item SSL_OP_SINGLE_DH_USE 124 | 41a new SSL object is created from a context using SSL_new(), the current 42option setting is copied. Changes to B<ctx> do not affect already created 43SSL objects. SSL_clear() does not affect the settings. 44 45The following B<bug workaround> options are available: 46 47=over 4 48 --- 73 unchanged lines hidden (view full) --- 122options. 123 124The following B<modifying> options are available: 125 126=over 4 127 128=item SSL_OP_SINGLE_DH_USE 129 |
| 125Always create a new key when using temporary DH parameters. | 130Always create a new key when using temporary/ephemeral DH parameters 131(see L<SSL_CTX_set_tmp_dh_callback(3)|SSL_CTX_set_tmp_dh_callback(3)>). 132This option must be used to prevent small subgroup attacks, when 133the DH parameters were not generated using "strong" primes 134(e.g. when using DSA-parameters, see L<dhparam(1)|dhparam(1)>). 135If "strong" primes were used, it is not strictly necessary to generate 136a new DH key during each handshake but it is also recommended. 137SSL_OP_SINGLE_DH_USE should therefore be enabled whenever 138temporary/ephemeral DH parameters are used. |
| 126 127=item SSL_OP_EPHEMERAL_RSA 128 | 139 140=item SSL_OP_EPHEMERAL_RSA 141 |
| 129Also use the temporary RSA key when doing RSA operations. | 142Always use ephemeral (temporary) RSA key when doing RSA operations 143(see L<SSL_CTX_set_tmp_rsa_callback(3)|SSL_CTX_set_tmp_rsa_callback(3)>). 144According to the specifications this is only done, when a RSA key 145can only be used for signature operations (namely under export ciphers 146with restricted RSA keylength). By setting this option, ephemeral 147RSA keys are always used. This option breaks compatibility with the 148SSL/TLS specifications and may lead to interoperability problems with 149clients and should therefore never be used. Ciphers with EDH (ephemeral 150Diffie-Hellman) key exchange should be used instead. |
| 130 131=item SSL_OP_PKCS1_CHECK_1 132 133... 134 135=item SSL_OP_PKCS1_CHECK_2 136 137... 138 139=item SSL_OP_NETSCAPE_CA_DN_BUG 140 141If we accept a netscape connection, demand a client cert, have a 142non-self-sighed CA which does not have it's CA in netscape, and the 143browser has a cert, it will crash/hang. Works for 3.x and 4.xbeta 144 | 151 152=item SSL_OP_PKCS1_CHECK_1 153 154... 155 156=item SSL_OP_PKCS1_CHECK_2 157 158... 159 160=item SSL_OP_NETSCAPE_CA_DN_BUG 161 162If we accept a netscape connection, demand a client cert, have a 163non-self-sighed CA which does not have it's CA in netscape, and the 164browser has a cert, it will crash/hang. Works for 3.x and 4.xbeta 165 |
| 145=item SSL_OP_NON_EXPORT_FIRST 146 147On servers try to use non-export (stronger) ciphers first. This option does 148not work under all circumstances (in the code it is declared "broken"). 149 | |
| 150=item SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG 151 152... 153 154=item SSL_OP_NO_SSLv2 155 156Do not use the SSLv2 protocol. 157 --- 11 unchanged lines hidden (view full) --- 169 170SSL_CTX_set_options() and SSL_set_options() return the new options bitmask 171after adding B<options>. 172 173SSL_CTX_get_options() and SSL_get_options() return the current bitmask. 174 175=head1 SEE ALSO 176 | 166=item SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG 167 168... 169 170=item SSL_OP_NO_SSLv2 171 172Do not use the SSLv2 protocol. 173 --- 11 unchanged lines hidden (view full) --- 185 186SSL_CTX_set_options() and SSL_set_options() return the new options bitmask 187after adding B<options>. 188 189SSL_CTX_get_options() and SSL_get_options() return the current bitmask. 190 191=head1 SEE ALSO 192 |
| 177L | 193L<ssl(3)|ssl(3)>, L<SSL_new(3)|SSL_new(3)>, L<SSL_clear(3)|SSL_clear(3)>, 194L<SSL_CTX_set_tmp_dh_callback(3)|SSL_CTX_set_tmp_dh_callback(3)>, 195L<SSL_CTX_set_tmp_rsa_callback(3)|SSL_CTX_set_tmp_rsa_callback(3)>, 196L<dhparam(1)|dhparam(1)> |
| 178 179=head1 HISTORY 180 181SSL_OP_TLS_ROLLBACK_BUG has been added in OpenSSL 0.9.6. 182 183=cut | 197 198=head1 HISTORY 199 200SSL_OP_TLS_ROLLBACK_BUG has been added in OpenSSL 0.9.6. 201 202=cut |