From 137479576664767db121c512db49f4c40789fa52 Mon Sep 17 00:00:00 2001 From: "Daniel P. Berrange" Date: Wed, 20 Dec 2017 17:56:50 +0100 Subject: [PATCH 10/42] io: Ignore websocket PING and PONG frames RH-Author: Daniel P. Berrange Message-id: <20171220175702.29663-9-berrange@redhat.com> Patchwork-id: 78460 O-Subject: [RHV-7.5 qemu-kvm-rhev PATCH v2 08/20] io: Ignore websocket PING and PONG frames Bugzilla: 1518649 RH-Acked-by: John Snow RH-Acked-by: Jeffrey Cody RH-Acked-by: Miroslav Rezanina From: Brandon Carpenter Keep pings and gratuitous pongs generated by web browsers from killing websocket connections. Signed-off-by: Brandon Carpenter Signed-off-by: Daniel P. Berrange (cherry picked from commit 01af17fc002414ee1ac0800babfb0edc2bef1a7d) Signed-off-by: Miroslav Rezanina --- io/channel-websock.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/io/channel-websock.c b/io/channel-websock.c index b19b5d9..bfe4008 100644 --- a/io/channel-websock.c +++ b/io/channel-websock.c @@ -115,6 +115,7 @@ #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE 0x0f #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_HAS_MASK 0x80 #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_PAYLOAD_LEN 0x7f +#define QIO_CHANNEL_WEBSOCK_CONTROL_OPCODE_MASK 0x8 typedef struct QIOChannelWebsockHeader QIOChannelWebsockHeader; @@ -659,8 +660,11 @@ static int qio_channel_websock_decode_header(QIOChannelWebsock *ioc, return -1; } } else { - if (opcode != QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME) { - error_setg(errp, "only binary websocket frames are supported"); + if (opcode != QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME && + opcode != QIO_CHANNEL_WEBSOCK_OPCODE_PING && + opcode != QIO_CHANNEL_WEBSOCK_OPCODE_PONG) { + error_setg(errp, "unsupported opcode: %#04x; only binary, ping, " + "and pong websocket frames are supported", opcode); return -1; } } @@ -673,6 +677,9 @@ static int qio_channel_websock_decode_header(QIOChannelWebsock *ioc, ioc->payload_remain = payload_len; header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT; ioc->mask = header->u.m; + } else if (opcode & QIO_CHANNEL_WEBSOCK_CONTROL_OPCODE_MASK) { + error_setg(errp, "websocket control frame is too large"); + return -1; } else if (payload_len == QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT && ioc->encinput.offset >= QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT) { ioc->payload_remain = be16_to_cpu(header->u.s16.l16); @@ -728,9 +735,15 @@ static int qio_channel_websock_decode_payload(QIOChannelWebsock *ioc, } } + /* Drop the payload of ping/pong packets */ + if (ioc->opcode == QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME) { + if (payload_len) { + buffer_reserve(&ioc->rawinput, payload_len); + buffer_append(&ioc->rawinput, ioc->encinput.buffer, payload_len); + } + } + if (payload_len) { - buffer_reserve(&ioc->rawinput, payload_len); - buffer_append(&ioc->rawinput, ioc->encinput.buffer, payload_len); buffer_advance(&ioc->encinput, payload_len); } return 0; -- 1.8.3.1