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[2017-09-29 19:10 UTC] james at jamesreno dot com
Description:
------------
When enabling ssl on a socket with php 7.0.24 the handshake blocks the socket. I expect the enable_crypto to immediately return "0" if the socket is in non-blocking mode and there is not enough data available to perform the handshake.
Test script:
---------------
<?php
$ssl_stream_ctx = stream_context_create(array(
'ssl' => array(
'local_cert' => 'cert.pem',
'verify_peer' => FALSE,
),
));
$listener = @stream_socket_server("tcp://127.0.0.1:1234",$errno,$errstr,STREAM_SERVER_BIND | STREAM_SERVER_LISTEN, $ssl_stream_ctx);
stream_set_blocking($listener, FALSE);
$peerName = FALSE;
$sock = @stream_socket_accept($fd, 0.01, $peerName);
stream_set_blocking($sock, FALSE);
$data = stream_socket_recvfrom($sock,1,STREAM_PEEK);
if ($data[0] == "\x16") {
$sslInitStartTime = microtime(TRUE);
$ret = stream_socket_enable_crypto($sock, TRUE, STREAM_CRYPTO_METHOD_SSLv23_SERVER);
$sslInitEndTime = microtime(TRUE);
$sslInitTime = $sslInitEndTime - $sslInitStartTime;
if ($sslInitTime >= 0.1) {
echo "ERROR SSL INIT TOOK TOO LONG." . PHP_EOL;
}
}
Expected result:
----------------
Expect to return immediately and not hange > 0.1sec
Actual result:
--------------
Script hangs sometimes up to several seconds with "far away high-latency" clients.
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Last updated: Sat Oct 25 02:00:01 2025 UTC |
in ext/openssl/xp_ssl.c there is a line: has_timeout = !sslsock->s.is_blocked && (timeout->tv_sec || timeout->tv_usec); From what I can gather this means that if a socket timeout is specified in the php.ini/config and then non-blocking is enabled the socket will WAIT upto a maximum of the default time and will hang a non-blocking socket due to the if (has_timeout) {} checking. if (has_timeout) { left_time = subtract_timeval( *timeout, elapsed_time ); } php_pollfd_for(sslsock->s.socket, (err == SSL_ERROR_WANT_READ) ? (POLLIN|POLLPRI) : POLLOUT, has_timeout ? &left_time : NULL); This is passed through to php_pollfd_for() instead of NULL which causes the non-blocking socket to "block". I believe if blocking is set, this part should ALWAYS be passed NULL so the line that reads: php_pollfd_for(sslsock->s.socket, (err == SSL_ERROR_WANT_READ) ? (POLLIN|POLLPRI) : POLLOUT, has_timeout ? &left_time : NULL); Should be changed to: php_pollfd_for(sslsock->s.socket, (err == SSL_ERROR_WANT_READ) ? (POLLIN|POLLPRI) : POLLOUT, !blocked && has_timeout ? &left_time : NULL);