SSL: workaround for incorrect SSL_write() errors in OpenSSL 1.1.1.
OpenSSL 1.1.1 fails to return SSL_ERROR_SYSCALL if an error happens
during SSL_write() after close_notify alert from the peer, and returns
SSL_ERROR_ZERO_RETURN instead. Broken by this commit, which removes
the "i == 0" check around the SSL_RECEIVED_SHUTDOWN one:
https://git.openssl.org/?p=openssl.git;a=commitdiff;h=8051ab2
In particular, if a client closed the connection without reading
the response but with properly sent close_notify alert, this resulted in
unexpected "SSL_write() failed while ..." critical log message instead
of correct "SSL_write() failed (32: Broken pipe)" at the info level.
Since SSL_ERROR_ZERO_RETURN cannot be legitimately returned after
SSL_write(), the fix is to convert all SSL_ERROR_ZERO_RETURN errors
after SSL_write() to SSL_ERROR_SYSCALL.
diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index f387c72..62b475d 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -2573,6 +2573,18 @@
sslerr = SSL_get_error(c->ssl->connection, n);
+ if (sslerr == SSL_ERROR_ZERO_RETURN) {
+
+ /*
+ * OpenSSL 1.1.1 fails to return SSL_ERROR_SYSCALL if an error
+ * happens during SSL_write() after close_notify alert from the
+ * peer, and returns SSL_ERROR_ZERO_RETURN instead,
+ * https://git.openssl.org/?p=openssl.git;a=commitdiff;h=8051ab2
+ */
+
+ sslerr = SSL_ERROR_SYSCALL;
+ }
+
err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_get_error: %d", sslerr);
