nginx.git/src/event, branch release-1.13.0

SSL: compatibility with OpenSSL master branch.

2017-04-18T13:08:46+00:00

The SSL_CTRL_SET_CURVES_LIST macro is removed in the OpenSSL master branch.
SSL_CTX_set1_curves_list is preserved as compatibility with previous versions.

SSL: disabled renegotiation detection in client mode.

2017-04-18T13:08:44+00:00

CVE-2009-3555 is no longer relevant and mitigated by the renegotiation
info extension (secure renegotiation).  On the other hand, unexpected
renegotiation still introduces potential security risks, and hence we do
not allow renegotiation on the server side, as we never request renegotiation.

On the client side the situation is different though.  There are backends
which explicitly request renegotiation, and disabled renegotiation
introduces interoperability problems.  This change allows renegotiation
on the client side, and fixes interoperability problems as observed with
such backends (ticket #872).

Additionally, with TLSv1.3 the SSL_CB_HANDSHAKE_START flag is currently set
by OpenSSL when receiving a NewSessionTicket message, and was detected by
nginx as a renegotiation attempt.  This looks like a bug in OpenSSL, though
this change also allows better interoperability till the problem is fixed.

SSL: added support for TLSv1.3 in ssl_protocols directive.

2017-04-18T12:12:38+00:00

Support for the TLSv1.3 protocol will be introduced in OpenSSL 1.1.1.

Core: set nginx_shared_zone name via ngx_str_set().

2017-03-28T08:28:51+00:00

Fixed a comment.

2017-03-17T09:09:31+00:00

Cancelable timers are now preserved if there are other timers.

2017-03-07T15:51:15+00:00

There is no need to cancel timers early if there are other timers blocking
shutdown anyway.  Preserving such timers allows nginx to continue some
periodic work till the shutdown is actually possible.

With the new approach, timers with ev->cancelable are simply ignored when
checking if there are any timers left during shutdown.

Added missing "static" specifiers found by gcc -Wtraditional.

2017-03-06T08:09:47+00:00

Added missing static specifiers.

2017-03-02T13:46:00+00:00

SSL: clear error queue after OPENSSL_init_ssl().

2017-02-06T15:38:06+00:00

The function may leave error in the error queue while returning success,
e.g., when taking a DSO reference to itself as of OpenSSL 1.1.0d:
https://git.openssl.org/?p=openssl.git;a=commit;h=4af9f7f

Notably, this fixes alert seen with statically linked OpenSSL on some platforms.

While here, check OPENSSL_init_ssl() return value.

Upstream: fixed cache corruption and socket leaks with aio_write.

2017-01-20T18:14:19+00:00

The ngx_event_pipe() function wasn't called on write events with
wev->delayed set.  As a result, threaded writing results weren't
properly collected in ngx_event_pipe_write_to_downstream() when a
write event was triggered for a completed write.

Further, this wasn't detected, as p->aio was reset by a thread completion
handler, and results were later collected in ngx_event_pipe_read_upstream()
instead of scheduling a new write of additional data.  If this happened
on the last reading from an upstream, last part of the response was never
written to the cache file.

Similar problems might also happen in case of timeouts when writing to
client, as this also results in ngx_event_pipe() not being called on write
events.  In this scenario socket leaks were observed.

Fix is to check if p->writing is set in ngx_event_pipe_read_upstream(), and
therefore collect results of previous write operations in case of read events
as well, similar to how we do so in ngx_event_pipe_write_downstream().
This is enough to fix the wev->delayed case.  Additionally, we now call
ngx_event_pipe() from ngx_http_upstream_process_request() if there are
uncollected write operations (p->writing and !p->aio).  This also fixes
the wev->timedout case.