File lighttpd-1.4.x_ssl_dos.patch of Package lighttpd

Index: src/connections.c
===================================================================
--- src/connections.c.orig	2007-09-06 13:24:20.000000000 +0200
+++ src/connections.c	2008-04-03 18:50:50.722726656 +0200
@@ -199,6 +199,7 @@ static int connection_handle_read_ssl(se
 
 	/* don't resize the buffer if we were in SSL_ERROR_WANT_* */
 
+	ERR_clear_error();
 	do {
 		if (!con->ssl_error_want_reuse_buffer) {
 			b = buffer_init();
@@ -1663,21 +1664,51 @@ int connection_state_machine(server *srv
 			}
 #ifdef USE_OPENSSL
 			if (srv_sock->is_ssl) {
-				int ret;
+				int ret, ssl_r;
+				unsigned long err;
+				ERR_clear_error();
 				switch ((ret = SSL_shutdown(con->ssl))) {
 				case 1:
 					/* ok */
 					break;
 				case 0:
-					SSL_shutdown(con->ssl);
-					break;
+					ERR_clear_error();
+					if (-1 != (ret = SSL_shutdown(con->ssl))) break;
+
+					/* fall through */
 				default:
-					log_error_write(srv, __FILE__, __LINE__, "sds", "SSL:",
-							SSL_get_error(con->ssl, ret),
-							ERR_error_string(ERR_get_error(), NULL));
-					return -1;
+
+					switch ((ssl_r = SSL_get_error(con->ssl, ret))) {
+					case SSL_ERROR_WANT_WRITE:
+					case SSL_ERROR_WANT_READ:
+						break;
+					case SSL_ERROR_SYSCALL:
+						/* perhaps we have error waiting in our error-queue */
+						if (0 != (err = ERR_get_error())) {
+							do {
+								log_error_write(srv, __FILE__, __LINE__, "sdds", "SSL:",
+										ssl_r, ret,
+										ERR_error_string(err, NULL));
+							} while((err = ERR_get_error()));
+						} else {
+							log_error_write(srv, __FILE__, __LINE__, "sddds", "SSL (error):",
+									ssl_r, ret, errno,
+									strerror(errno));
+						}
+	
+						break;
+					default:
+						while((err = ERR_get_error())) {
+							log_error_write(srv, __FILE__, __LINE__, "sdds", "SSL:",
+									ssl_r, ret,
+									ERR_error_string(err, NULL));
+						}
+	
+						break;
+					}
 				}
 			}
+			ERR_clear_error();
 #endif
 
 			switch(con->mode) {
Index: src/network_openssl.c
===================================================================
--- src/network_openssl.c.orig	2006-10-04 15:26:23.000000000 +0200
+++ src/network_openssl.c	2008-04-03 17:11:46.808931592 +0200
@@ -110,6 +110,7 @@ int network_write_chunkqueue_openssl(ser
 			 *
 			 */
 
+			ERR_clear_error();
 			if ((r = SSL_write(ssl, offset, toSend)) <= 0) {
 				unsigned long err;
 
@@ -211,6 +212,7 @@ int network_write_chunkqueue_openssl(ser
 
 				close(ifd);
 
+				ERR_clear_error();
 				if ((r = SSL_write(ssl, s, toSend)) <= 0) {
 					unsigned long err;