correct docs

[openssl.git] / doc / ssl / SSL_CTX_set_options.pod

diff --git a/doc/ssl/SSL_CTX_set_options.pod b/doc/ssl/SSL_CTX_set_options.pod
index 3e61a36e170f69caff9625547133156e5573c087..cc588f3a78f3a302a4b422bc2fdc9dc55728e5d9 100644 (file)
--- a/doc/ssl/SSL_CTX_set_options.pod
+++ b/doc/ssl/SSL_CTX_set_options.pod
@@ -78,18 +78,7 @@ this breaks this server so 16 bytes is the way to go.
 
 =item SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG
 
-ssl3.netscape.com:443, first a connection is established with RC4-MD5.
-If it is then resumed, we end up using DES-CBC3-SHA.  It should be
-RC4-MD5 according to 7.6.1.3, 'cipher_suite'.
-
-Netscape-Enterprise/2.01 (https://merchant.netscape.com) has this bug.
-It only really shows up when connecting via SSLv2/v3 then reconnecting
-via SSLv3. The cipher list changes....
-
-NEW INFORMATION.  Try connecting with a cipher list of just
-DES-CBC-SHA:RC4-MD5.  For some weird reason, each new connection uses
-RC4-MD5, but a re-connect tries to use DES-CBC-SHA.  So netscape, when
-doing a re-connect, always takes the first cipher in the cipher list.
+As of OpenSSL 0.9.8q and 1.0.0c, this option has no effect.
 
 =item SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG
 
@@ -224,10 +213,16 @@ 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
+
+Allow legacy insecure renegotiation between OpenSSL and unpatched clients or
+servers. See the B<SECURE RENEGOTIATION> section for more details.
 
-See the B<SECURE RENEGOTIATION> section for a discussion of the purpose of
-these options.
+=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
 
@@ -237,7 +232,7 @@ OpenSSL 0.9.8m and later always attempts to use secure renegotiation as
 described in RFC5746. This counters the prefix attack described in
 CVE-2009-3555 and elsewhere.
 
-The deprecated and highly broken SSLv2 protocol does not support secure
+The deprecated and highly broken SSLv2 protocol does not support
 renegotiation at all: its use is B<strongly> discouraged.
 
 This attack has far reaching consequences which application writers should be
@@ -275,11 +270,18 @@ was refused.
 
 =head2 Patched OpenSSL client and unpatched server.
 
-If the option B<SSL_OP_LEGACY_SERVER_CONNECT> is set then initial connections
-between patched OpenSSL clients and unpatched servers succeed. 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.
+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. If neither option is set then initial connections to unpatched
+servers will fail.
+
+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.
@@ -292,10 +294,12 @@ 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().
 
-Renegotiation between a patched OpenSSL client and unpatched server follows
-the same scheme as between an unpatched client and a patched OpenSSL server:
-i.e. it is not permitted unless the option
-B<SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION> is set.
+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