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Update documentation regarding no_renegotiation handling 

Clarify what happens in the event that a no_renegotiation alert is
received.

Reviewed-by: Frederik Wedel-Heinen <fwh.openssl@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27591)

(cherry picked from commit 0db6a59ea7)
This commit is contained in:
Matt Caswell 2025-06-02 15:39:45 +01:00 committed by Tomas Mraz
parent 1e8f89baaf
commit 4b6f6604d8
3 changed files with 5 additions and 3 deletions
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2
doc/man3/SSL_CONF_cmd.pod
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@ -71,7 +71,7 @@ B<SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION>.
=item B<-no_renegotiation> =item B<-no_renegotiation>
Disables all attempts at renegotiation in TLSv1.2 and earlier, same as setting Disables all attempts at renegotiation in (D)TLSv1.2 and earlier, same as setting
B<SSL_OP_NO_RENEGOTIATION>. B<SSL_OP_NO_RENEGOTIATION>.
=item B<-no_resumption_on_reneg> =item B<-no_resumption_on_reneg>

2
doc/man3/SSL_CTX_set_options.pod
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@ -241,7 +241,7 @@ Do not query the MTU. Only affects DTLS connections.
=item SSL_OP_NO_RENEGOTIATION =item SSL_OP_NO_RENEGOTIATION
Disable all renegotiation in TLSv1.2 and earlier. Do not send HelloRequest Disable all renegotiation in (D)TLSv1.2 and earlier. Do not send HelloRequest
messages, and ignore renegotiation requests via ClientHello. messages, and ignore renegotiation requests via ClientHello.
=item SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION =item SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION

4
doc/man3/SSL_key_update.pod
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@ -53,7 +53,9 @@ such as SSL_read_ex() or SSL_write_ex() takes place on the connection a check
will be performed to confirm that it is a suitable time to start a will be performed to confirm that it is a suitable time to start a
renegotiation. If so, then it will be initiated immediately. OpenSSL will not renegotiation. If so, then it will be initiated immediately. OpenSSL will not
attempt to resume any session associated with the connection in the new attempt to resume any session associated with the connection in the new
handshake. handshake. Note that some servers will respond to reneogitation attempts with
a "no_renegotiation" alert. An OpenSSL will immediately fail the connection in
this case.
When called from the client side, SSL_renegotiate_abbreviated() works in the When called from the client side, SSL_renegotiate_abbreviated() works in the
same was as SSL_renegotiate() except that OpenSSL will attempt to resume the same was as SSL_renegotiate() except that OpenSSL will attempt to resume the