Loading doc/ssl/SSL_CTX_set_options.pod +25 −13 Original line number Diff line number Diff line Loading @@ -224,10 +224,16 @@ of RFC4507bis tickets for stateless session resumption. If this option is set this functionality is disabled and tickets will not be used by clients or servers. =item SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, SSL_OP_LEGACY_SERVER_CONNECT =item SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION See the B<SECURE RENEGOTIATION> section for a discussion of the purpose of these options. Allow legacy insecure renegotiation between OpenSSL and unpatched clients or servers. See the B<SECURE RENEGOTIATION> section for more details. =item SSL_OP_LEGACY_SERVER_CONNECT Allow legacy insecure renegotiation between OpenSSL and unpatched servers B<only>: this option is currently set by default. See the B<SECURE RENEGOTIATION> section for more details. =back Loading Loading @@ -275,15 +281,18 @@ was refused. =head2 Patched OpenSSL client and unpatched server. If the option B<SSL_OP_LEGACY_SERVER_CONNECT> is set then initial connections If the option B<SSL_OP_LEGACY_SERVER_CONNECT> or B<SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION> is set then initial connections and renegotiation between patched OpenSSL clients and unpatched servers succeeds. succeeds. If neither option is set then initial connections to unpatched servers will fail. This option is currently set by default even though it has security implications: otherwise it would be impossible to connect to unpatched servers (i.e. all of them initially) and this is clearly not acceptable. Renegotiation is permitted because this does not add any additional security issues: during an attack clients do not see any renegotiations anyway. The option B<SSL_OP_LEGACY_SERVER_CONNECT> is currently set by default even though it has security implications: otherwise it would be impossible to connect to unpatched servers (i.e. all of them initially) and this is clearly not acceptable. Renegotiation is permitted because this does not add any additional security issues: during an attack clients do not see any renegotiations anyway. As more servers become patched the option B<SSL_OP_LEGACY_SERVER_CONNECT> will B<not> be set by default in a future version of OpenSSL. Loading @@ -296,9 +305,12 @@ unpatched servers (and thus avoid any security issues) should always B<clear> B<SSL_OP_LEGACY_SERVER_CONNECT> using SSL_CTX_clear_options() or SSL_clear_options(). As in the previous case if the option B<SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION> is set then renegotiation B<always> succeeds. The difference between the B<SSL_OP_LEGACY_SERVER_CONNECT> and B<SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION> options is that B<SSL_OP_LEGACY_SERVER_CONNECT> enables initial connections and secure renegotiation between OpenSSL clients and unpatched servers B<only>, while B<SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION> allows initial connections and renegotiation between OpenSSL and unpatched clients or servers. =head1 RETURN VALUES Loading Loading
doc/ssl/SSL_CTX_set_options.pod +25 −13 Original line number Diff line number Diff line Loading @@ -224,10 +224,16 @@ of RFC4507bis tickets for stateless session resumption. If this option is set this functionality is disabled and tickets will not be used by clients or servers. =item SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, SSL_OP_LEGACY_SERVER_CONNECT =item SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION See the B<SECURE RENEGOTIATION> section for a discussion of the purpose of these options. Allow legacy insecure renegotiation between OpenSSL and unpatched clients or servers. See the B<SECURE RENEGOTIATION> section for more details. =item SSL_OP_LEGACY_SERVER_CONNECT Allow legacy insecure renegotiation between OpenSSL and unpatched servers B<only>: this option is currently set by default. See the B<SECURE RENEGOTIATION> section for more details. =back Loading Loading @@ -275,15 +281,18 @@ was refused. =head2 Patched OpenSSL client and unpatched server. If the option B<SSL_OP_LEGACY_SERVER_CONNECT> is set then initial connections If the option B<SSL_OP_LEGACY_SERVER_CONNECT> or B<SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION> is set then initial connections and renegotiation between patched OpenSSL clients and unpatched servers succeeds. succeeds. If neither option is set then initial connections to unpatched servers will fail. This option is currently set by default even though it has security implications: otherwise it would be impossible to connect to unpatched servers (i.e. all of them initially) and this is clearly not acceptable. Renegotiation is permitted because this does not add any additional security issues: during an attack clients do not see any renegotiations anyway. The option B<SSL_OP_LEGACY_SERVER_CONNECT> is currently set by default even though it has security implications: otherwise it would be impossible to connect to unpatched servers (i.e. all of them initially) and this is clearly not acceptable. Renegotiation is permitted because this does not add any additional security issues: during an attack clients do not see any renegotiations anyway. As more servers become patched the option B<SSL_OP_LEGACY_SERVER_CONNECT> will B<not> be set by default in a future version of OpenSSL. Loading @@ -296,9 +305,12 @@ unpatched servers (and thus avoid any security issues) should always B<clear> B<SSL_OP_LEGACY_SERVER_CONNECT> using SSL_CTX_clear_options() or SSL_clear_options(). As in the previous case if the option B<SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION> is set then renegotiation B<always> succeeds. The difference between the B<SSL_OP_LEGACY_SERVER_CONNECT> and B<SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION> options is that B<SSL_OP_LEGACY_SERVER_CONNECT> enables initial connections and secure renegotiation between OpenSSL clients and unpatched servers B<only>, while B<SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION> allows initial connections and renegotiation between OpenSSL and unpatched clients or servers. =head1 RETURN VALUES Loading
