mirror of
https://github.com/warmcat/libwebsockets.git
synced 2025-03-09 00:00:04 +01:00
h2: POST: restrict block handling to end of frame
This commit is contained in:
Andy Green
parent
a663aefebd
commit
67db15a84a
1 changed files with 271 additions and 258 deletions
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@ -723,7 +723,7 @@ lws_h2_parse_frame_header(struct lws *wsi)
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if (h2n->sid)
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h2n->swsi = lws_h2_wsi_from_id(wsi, h2n->sid);
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lwsl_notice("%p (%p): fr hdr: typ 0x%x, flags 0x%x, sid 0x%x, len 0x%x\n",
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lwsl_debug("%p (%p): fr hdr: typ 0x%x, flags 0x%x, sid 0x%x, len 0x%x\n",
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wsi, h2n->swsi, h2n->type, h2n->flags, h2n->sid,
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h2n->length);
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@ -1340,299 +1340,312 @@ lws_h2_parser(struct lws *wsi, unsigned char *in, lws_filepos_t inlen,
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c = *in++;
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switch (wsi->state) {
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case LWSS_HTTP2_AWAIT_CLIENT_PREFACE:
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if (preface[h2n->count++] != c)
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goto fail;
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switch (wsi->state) {
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case LWSS_HTTP2_AWAIT_CLIENT_PREFACE:
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if (preface[h2n->count++] != c)
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goto fail;
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if (preface[h2n->count])
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if (preface[h2n->count])
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break;
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lwsl_info("http2: %p: established\n", wsi);
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wsi->state = LWSS_HTTP2_ESTABLISHED_PRE_SETTINGS;
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h2n->count = 0;
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wsi->h2.tx_cr = 65535;
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/*
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* we must send a settings frame -- empty one is OK...
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* that must be the first thing sent by server
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* and the peer must send a SETTINGS with ACK flag...
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*/
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pps = lws_h2_new_pps(LWS_H2_PPS_MY_SETTINGS);
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if (!pps)
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goto fail;
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lws_pps_schedule(wsi, pps);
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break;
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lwsl_info("http2: %p: established\n", wsi);
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wsi->state = LWSS_HTTP2_ESTABLISHED_PRE_SETTINGS;
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h2n->count = 0;
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wsi->h2.tx_cr = 65535;
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case LWSS_HTTP2_ESTABLISHED_PRE_SETTINGS:
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case LWSS_HTTP2_ESTABLISHED:
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if (h2n->frame_state != LWS_H2_FRAME_HEADER_LENGTH)
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goto try_frame_start;
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/*
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* we must send a settings frame -- empty one is OK...
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* that must be the first thing sent by server
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* and the peer must send a SETTINGS with ACK flag...
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*/
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pps = lws_h2_new_pps(LWS_H2_PPS_MY_SETTINGS);
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if (!pps)
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goto fail;
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lws_pps_schedule(wsi, pps);
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break;
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case LWSS_HTTP2_ESTABLISHED_PRE_SETTINGS:
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case LWSS_HTTP2_ESTABLISHED:
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if (h2n->frame_state != LWS_H2_FRAME_HEADER_LENGTH)
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goto try_frame_start;
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/*
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* post-header, preamble / payload / padding part
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*/
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h2n->count++;
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if (h2n->flags & LWS_H2_FLAG_PADDED && !h2n->pad_length) {
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/*
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* Get the padding count... actual padding is
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* at the end of the frame.
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* post-header, preamble / payload / padding part
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*/
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h2n->padding = c;
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h2n->pad_length = 1;
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h2n->preamble++;
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h2n->count++;
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if (h2n->padding > h2n->length - 1)
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lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
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"execssive padding");
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break; /* we consumed this */
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}
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if (h2n->flags & LWS_H2_FLAG_PADDED && !h2n->pad_length) {
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/*
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* Get the padding count... actual padding is
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* at the end of the frame.
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*/
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h2n->padding = c;
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h2n->pad_length = 1;
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h2n->preamble++;
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if (h2n->flags & LWS_H2_FLAG_PRIORITY &&
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!h2n->collected_priority) {
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/* going to be 5 preamble bytes */
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lwsl_debug("PRIORITY FLAG: 0x%x\n", c);
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if (h2n->preamble++ - h2n->pad_length < 4) {
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h2n->dep = ((h2n->dep) << 8) | c;
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if (h2n->padding > h2n->length - 1)
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lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
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"execssive padding");
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break; /* we consumed this */
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}
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h2n->weight_temp = c;
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h2n->collected_priority = 1;
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lwsl_debug("PRI FL: dep 0x%x, weight 0x%02X\n",
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h2n->dep, h2n->weight_temp);
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break; /* we consumed this */
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}
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if (h2n->padding && h2n->count > (h2n->length - h2n->padding)) {
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if (c) {
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lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
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"nonzero padding");
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break;
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if (h2n->flags & LWS_H2_FLAG_PRIORITY &&
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!h2n->collected_priority) {
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/* going to be 5 preamble bytes */
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lwsl_debug("PRIORITY FLAG: 0x%x\n", c);
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if (h2n->preamble++ - h2n->pad_length < 4) {
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h2n->dep = ((h2n->dep) << 8) | c;
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break; /* we consumed this */
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}
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h2n->weight_temp = c;
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h2n->collected_priority = 1;
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lwsl_debug("PRI FL: dep 0x%x, weight 0x%02X\n",
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h2n->dep, h2n->weight_temp);
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break; /* we consumed this */
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}
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goto frame_end;
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}
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/* applies to wsi->h2.swsi which may be wsi */
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switch(h2n->type) {
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case LWS_H2_FRAME_TYPE_SETTINGS:
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n = (h2n->count - 1 - h2n->preamble) %
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LWS_H2_SETTINGS_LEN;
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h2n->one_setting[n] = c;
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if (n != LWS_H2_SETTINGS_LEN - 1)
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break;
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lws_h2_settings(wsi, &h2n->set, h2n->one_setting,
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LWS_H2_SETTINGS_LEN);
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break;
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case LWS_H2_FRAME_TYPE_CONTINUATION:
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case LWS_H2_FRAME_TYPE_HEADERS:
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if (!h2n->swsi)
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break;
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if (lws_hpack_interpret(h2n->swsi, c)) {
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lwsl_info("%s: hpack failed\n", __func__);
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goto fail;
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if (h2n->padding && h2n->count > (h2n->length - h2n->padding)) {
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if (c) {
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lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
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"nonzero padding");
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break;
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}
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goto frame_end;
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}
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break;
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case LWS_H2_FRAME_TYPE_GOAWAY:
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switch (h2n->inside++) {
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case 0:
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case 1:
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case 2:
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case 3:
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h2n->goaway_last_sid <<= 8;
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h2n->goaway_last_sid |= c;
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h2n->goaway_str[0] = '\0';
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/* applies to wsi->h2.swsi which may be wsi */
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switch(h2n->type) {
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case LWS_H2_FRAME_TYPE_SETTINGS:
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n = (h2n->count - 1 - h2n->preamble) %
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LWS_H2_SETTINGS_LEN;
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h2n->one_setting[n] = c;
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if (n != LWS_H2_SETTINGS_LEN - 1)
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break;
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lws_h2_settings(wsi, &h2n->set, h2n->one_setting,
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LWS_H2_SETTINGS_LEN);
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break;
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case 4:
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case 5:
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case 6:
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case 7:
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h2n->goaway_err <<= 8;
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h2n->goaway_err |= c;
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case LWS_H2_FRAME_TYPE_CONTINUATION:
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case LWS_H2_FRAME_TYPE_HEADERS:
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if (!h2n->swsi)
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break;
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if (lws_hpack_interpret(h2n->swsi, c)) {
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lwsl_info("%s: hpack failed\n", __func__);
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goto fail;
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}
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break;
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case LWS_H2_FRAME_TYPE_GOAWAY:
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switch (h2n->inside++) {
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case 0:
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case 1:
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case 2:
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case 3:
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h2n->goaway_last_sid <<= 8;
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h2n->goaway_last_sid |= c;
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h2n->goaway_str[0] = '\0';
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break;
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case 4:
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case 5:
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case 6:
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case 7:
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h2n->goaway_err <<= 8;
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h2n->goaway_err |= c;
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break;
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default:
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if (h2n->inside - 9 <
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sizeof(h2n->goaway_str) - 1)
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h2n->goaway_str[h2n->inside - 9] = c;
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h2n->goaway_str[sizeof(h2n->goaway_str) - 1] = '\0';
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break;
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}
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break;
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case LWS_H2_FRAME_TYPE_DATA:
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/* let the network wsi live a bit longer if subs are active...
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* our frame may take a long time to chew through */
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lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE, 31);
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if (!h2n->swsi)
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break;
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if (h2n->swsi->state == LWSS_HTTP2_ESTABLISHED) {
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h2n->swsi->state = LWSS_HTTP_BODY;
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lwsl_notice("%s: setting swsi %p to LWSS_HTTP_BODY\n", __func__, h2n->swsi);
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}
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if (lws_hdr_total_length(h2n->swsi,
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WSI_TOKEN_HTTP_CONTENT_LENGTH) &&
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h2n->swsi->http.rx_content_length &&
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h2n->swsi->http.rx_content_remain < inlen + 1 && /* last */
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h2n->inside < h2n->length) { /* unread data in frame */
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lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
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"More rx than content_length told");
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break;
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}
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h2n->swsi->outer_will_close = 1;
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/*
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* choose the length for this go so that we end at
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* the frame boundary, in the case there is already
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* more waiting leave it for next time around
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*/
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n = inlen + 1;
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if (n > (int)(h2n->length - h2n->count + 1)) {
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n = h2n->length - h2n->count + 1;
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lwsl_debug("---- restricting len to %d vs %ld\n", n, (long)inlen + 1);
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}
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n = lws_read(h2n->swsi, in - 1, n);
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h2n->swsi->outer_will_close = 0;
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/*
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* can return 0 in POST body with content len
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* exhausted somehow.
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*/
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if (n <= 0)
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goto fail;
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inlen -= n - 1;
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in += n - 1;
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h2n->inside += n;
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h2n->count += n - 1;
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/* account for both network and stream wsi windows */
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wsi->h2.peer_tx_cr_est -= n;
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h2n->swsi->h2.peer_tx_cr_est -= n;
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// lwsl_notice(" peer_tx_cr_est %d, parent %d\n",
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// h2n->swsi->h2.peer_tx_cr_est, wsi->h2.peer_tx_cr_est);
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if (h2n->swsi->h2.peer_tx_cr_est < (int)(2 * h2n->length) + 65536) {
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pps = lws_h2_new_pps(LWS_H2_PPS_UPDATE_WINDOW);
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if (!pps)
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return 1;
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pps->u.update_window.sid = h2n->sid;
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pps->u.update_window.credit = (2 * h2n->length + 65536);
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h2n->swsi->h2.peer_tx_cr_est += pps->u.update_window.credit;
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lws_pps_schedule(wsi, pps);
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}
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if (wsi->h2.peer_tx_cr_est < (int)(2 * h2n->length) + 65536) {
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pps = lws_h2_new_pps(LWS_H2_PPS_UPDATE_WINDOW);
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if (!pps)
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return 1;
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pps->u.update_window.sid = 0;
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pps->u.update_window.credit = (2 * h2n->length + 65536);
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wsi->h2.peer_tx_cr_est += pps->u.update_window.credit;
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lws_pps_schedule(wsi, pps);
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}
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// lwsl_notice("%s: count %d len %d\n", __func__, (int)h2n->count, (int)h2n->length);
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break;
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case LWS_H2_FRAME_TYPE_PRIORITY:
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if (h2n->count <= 4) {
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h2n->dep <<= 8;
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h2n->dep |= c;
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} else {
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h2n->weight_temp = c;
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lwsl_info("PRIORITY: dep 0x%x, weight 0x%02X\n",
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h2n->dep, h2n->weight_temp);
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if ((h2n->dep & ~(1 << 31)) == h2n->sid) {
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lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
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"cant depend on own sid");
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break;
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}
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}
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break;
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case LWS_H2_FRAME_TYPE_RST_STREAM:
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break;
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case LWS_H2_FRAME_TYPE_PUSH_PROMISE:
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break;
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case LWS_H2_FRAME_TYPE_PING:
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if (h2n->flags & LWS_H2_FLAG_SETTINGS_ACK) { // ack
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} else { /* they're sending us a ping request */
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if (h2n->count > 8)
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return 1;
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h2n->ping_payload[h2n->count - 1] = c;
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}
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break;
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case LWS_H2_FRAME_TYPE_WINDOW_UPDATE:
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h2n->hpack_e_dep <<= 8;
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h2n->hpack_e_dep |= c;
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break;
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case LWS_H2_FRAME_TYPE_COUNT: /* IGNORING FRAME */
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break;
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default:
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if (h2n->inside - 9 <
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sizeof(h2n->goaway_str) - 1)
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h2n->goaway_str[h2n->inside - 9] = c;
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h2n->goaway_str[sizeof(h2n->goaway_str) - 1] = '\0';
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break;
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}
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break;
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lwsl_notice("%s: unhandled frame type %d\n",
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__func__, h2n->type);
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case LWS_H2_FRAME_TYPE_DATA:
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// lwsl_notice("incoming LWS_H2_FRAME_TYPE_DATA content\n");
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/* let the network wsi live a bit longer if subs are active...
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* our frame may take a long time to chew through */
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lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE, 31);
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if (!h2n->swsi)
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break;
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if (h2n->swsi->state == LWSS_HTTP2_ESTABLISHED) {
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h2n->swsi->state = LWSS_HTTP_BODY;
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lwsl_notice("%s: setting swsi %p to LWSS_HTTP_BODY\n", __func__, h2n->swsi);
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goto fail;
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}
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if (lws_hdr_total_length(h2n->swsi,
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WSI_TOKEN_HTTP_CONTENT_LENGTH) &&
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h2n->swsi->http.rx_content_length &&
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h2n->swsi->http.rx_content_remain < inlen + 1 && /* last */
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h2n->inside < h2n->length) { /* unread data in frame */
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lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
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"More rx than content_length told");
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frame_end:
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if (h2n->count > h2n->length)
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lwsl_notice("%d %d\n", h2n->count, h2n->length);
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if (h2n->count != h2n->length)
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break;
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}
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h2n->swsi->outer_will_close = 1;
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n = lws_read(h2n->swsi, in - 1, inlen + 1);
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h2n->swsi->outer_will_close = 0;
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/*
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* can return 0 in POST body with content len
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* exhausted somehow.
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* end of frame just happened
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*/
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if (n <= 0)
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if (lws_h2_parse_end_of_frame(wsi))
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goto fail;
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inlen -= n - 1;
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in += n - 1;
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h2n->inside += n;
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h2n->count += n - 1;
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/* account for both network and stream wsi windows */
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wsi->h2.peer_tx_cr_est -= n;
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h2n->swsi->h2.peer_tx_cr_est -= n;
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// lwsl_notice(" peer_tx_cr_est %d, parent %d\n",
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// h2n->swsi->h2.peer_tx_cr_est, wsi->h2.peer_tx_cr_est);
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if (h2n->swsi->h2.peer_tx_cr_est < (int)(2 * h2n->length) + 65536) {
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pps = lws_h2_new_pps(LWS_H2_PPS_UPDATE_WINDOW);
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if (!pps)
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return 1;
|
||||
pps->u.update_window.sid = h2n->sid;
|
||||
pps->u.update_window.credit = (2 * h2n->length + 65536);
|
||||
h2n->swsi->h2.peer_tx_cr_est += pps->u.update_window.credit;
|
||||
lws_pps_schedule(wsi, pps);
|
||||
}
|
||||
if (wsi->h2.peer_tx_cr_est < (int)(2 * h2n->length) + 65536) {
|
||||
pps = lws_h2_new_pps(LWS_H2_PPS_UPDATE_WINDOW);
|
||||
if (!pps)
|
||||
return 1;
|
||||
pps->u.update_window.sid = 0;
|
||||
pps->u.update_window.credit = (2 * h2n->length + 65536);
|
||||
wsi->h2.peer_tx_cr_est += pps->u.update_window.credit;
|
||||
lws_pps_schedule(wsi, pps);
|
||||
}
|
||||
|
||||
// lwsl_notice("%s: count %d len %d\n", __func__, (int)h2n->count, (int)h2n->length);
|
||||
|
||||
break;
|
||||
|
||||
case LWS_H2_FRAME_TYPE_PRIORITY:
|
||||
if (h2n->count <= 4) {
|
||||
h2n->dep <<= 8;
|
||||
h2n->dep |= c;
|
||||
} else {
|
||||
h2n->weight_temp = c;
|
||||
lwsl_info("PRIORITY: dep 0x%x, weight 0x%02X\n",
|
||||
h2n->dep, h2n->weight_temp);
|
||||
try_frame_start:
|
||||
if (h2n->frame_state <= 8) {
|
||||
|
||||
if ((h2n->dep & ~(1 << 31)) == h2n->sid) {
|
||||
lws_h2_goaway(wsi, H2_ERR_PROTOCOL_ERROR,
|
||||
"cant depend on own sid");
|
||||
switch (h2n->frame_state++) {
|
||||
case 0:
|
||||
h2n->pad_length = 0;
|
||||
h2n->collected_priority = 0;
|
||||
h2n->padding = 0;
|
||||
h2n->preamble = 0;
|
||||
h2n->length = c;
|
||||
h2n->inside = 0;
|
||||
break;
|
||||
case 1:
|
||||
case 2:
|
||||
h2n->length <<= 8;
|
||||
h2n->length |= c;
|
||||
break;
|
||||
case 3:
|
||||
h2n->type = c;
|
||||
break;
|
||||
case 4:
|
||||
h2n->flags = c;
|
||||
break;
|
||||
|
||||
case 5:
|
||||
case 6:
|
||||
case 7:
|
||||
case 8:
|
||||
h2n->sid <<= 8;
|
||||
h2n->sid |= c;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (h2n->frame_state == LWS_H2_FRAME_HEADER_LENGTH)
|
||||
if (lws_h2_parse_frame_header(wsi))
|
||||
goto fail;
|
||||
break;
|
||||
|
||||
case LWS_H2_FRAME_TYPE_RST_STREAM:
|
||||
break;
|
||||
|
||||
case LWS_H2_FRAME_TYPE_PUSH_PROMISE:
|
||||
break;
|
||||
|
||||
case LWS_H2_FRAME_TYPE_PING:
|
||||
if (h2n->flags & LWS_H2_FLAG_SETTINGS_ACK) { // ack
|
||||
} else { /* they're sending us a ping request */
|
||||
if (h2n->count > 8)
|
||||
return 1;
|
||||
h2n->ping_payload[h2n->count - 1] = c;
|
||||
}
|
||||
break;
|
||||
|
||||
case LWS_H2_FRAME_TYPE_WINDOW_UPDATE:
|
||||
h2n->hpack_e_dep <<= 8;
|
||||
h2n->hpack_e_dep |= c;
|
||||
break;
|
||||
|
||||
case LWS_H2_FRAME_TYPE_COUNT: /* IGNORING FRAME */
|
||||
break;
|
||||
|
||||
default:
|
||||
lwsl_notice("%s: unhandled frame type %d\n",
|
||||
__func__, h2n->type);
|
||||
|
||||
goto fail;
|
||||
}
|
||||
|
||||
frame_end:
|
||||
if (h2n->count != h2n->length)
|
||||
break;
|
||||
|
||||
/*
|
||||
* end of frame just happened
|
||||
*/
|
||||
if (lws_h2_parse_end_of_frame(wsi))
|
||||
goto fail;
|
||||
break;
|
||||
|
||||
try_frame_start:
|
||||
if (h2n->frame_state <= 8) {
|
||||
|
||||
switch (h2n->frame_state++) {
|
||||
case 0:
|
||||
h2n->pad_length = 0;
|
||||
h2n->collected_priority = 0;
|
||||
h2n->padding = 0;
|
||||
h2n->preamble = 0;
|
||||
h2n->length = c;
|
||||
h2n->inside = 0;
|
||||
break;
|
||||
case 1:
|
||||
case 2:
|
||||
h2n->length <<= 8;
|
||||
h2n->length |= c;
|
||||
break;
|
||||
case 3:
|
||||
h2n->type = c;
|
||||
break;
|
||||
case 4:
|
||||
h2n->flags = c;
|
||||
break;
|
||||
|
||||
case 5:
|
||||
case 6:
|
||||
case 7:
|
||||
case 8:
|
||||
h2n->sid <<= 8;
|
||||
h2n->sid |= c;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (h2n->frame_state == LWS_H2_FRAME_HEADER_LENGTH)
|
||||
if (lws_h2_parse_frame_header(wsi))
|
||||
goto fail;
|
||||
break;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
*inused = in - oldin;
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue