mod_ssl SSL_OP_IGNORE_UNEXPECTED_EOF: "unexpected eof while reading"

[Rainer Jung]

Hi there,

OpenSSL 3 flags some abortive shutdowns as an error different to what 
1.1.1 did. This results in info log output in httpd:

[Tue Aug 29 12:33:06.787210 2023] [ssl:info] [pid 1994673:tid 1994737] 
SSL Library Error: error:0A000126:SSL routines::unexpected eof while reading
[Tue Aug 29 12:33:06.787374 2023] [ssl:info] [pid 1994673:tid 1994737] 
[client 1.2.3.4:54790] AH01998: Connection closed to child 215 with 
abortive shutdown (server myserver:443)

Some background is given in

  https://github.com/openssl/openssl/issues/18866

They introduced a new context option "SSL_OP_IGNORE_UNEXPECTED_EOF" to 
suppress this. Some other software now sets it with SSL_CTX_set_options():

- nginx

https://github.com/nginx/nginx/commit/5155845ce4453a07d60e2ce43946c9181bc311fa

- PHP

https://github.com/php/php-src/pull/8558/commits/55be0f489e390d28892a07c32d45a404c62fc9f2

I suggest to adopt it, ie. set it if the option is available.

WDYT?

Best regards,

Rainer