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-rw-r--r--src/http_ana.c5277
1 files changed, 5277 insertions, 0 deletions
diff --git a/src/http_ana.c b/src/http_ana.c
new file mode 100644
index 0000000..273fe16
--- /dev/null
+++ b/src/http_ana.c
@@ -0,0 +1,5277 @@
+/*
+ * HTTP protocol analyzer
+ *
+ * Copyright (C) 2018 HAProxy Technologies, Christopher Faulet <cfaulet@haproxy.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <haproxy/acl.h>
+#include <haproxy/action-t.h>
+#include <haproxy/api.h>
+#include <haproxy/applet.h>
+#include <haproxy/backend.h>
+#include <haproxy/base64.h>
+#include <haproxy/capture-t.h>
+#include <haproxy/cfgparse.h>
+#include <haproxy/channel.h>
+#include <haproxy/check.h>
+#include <haproxy/connection.h>
+#include <haproxy/errors.h>
+#include <haproxy/filters.h>
+#include <haproxy/http.h>
+#include <haproxy/http_ana.h>
+#include <haproxy/http_htx.h>
+#include <haproxy/htx.h>
+#include <haproxy/log.h>
+#include <haproxy/net_helper.h>
+#include <haproxy/proxy.h>
+#include <haproxy/regex.h>
+#include <haproxy/sc_strm.h>
+#include <haproxy/server-t.h>
+#include <haproxy/stats.h>
+#include <haproxy/stconn.h>
+#include <haproxy/stream.h>
+#include <haproxy/trace.h>
+#include <haproxy/uri_auth-t.h>
+#include <haproxy/vars.h>
+
+
+#define TRACE_SOURCE &trace_strm
+
+extern const char *stat_status_codes[];
+
+struct pool_head *pool_head_requri __read_mostly = NULL;
+struct pool_head *pool_head_capture __read_mostly = NULL;
+
+
+static void http_end_request(struct stream *s);
+static void http_end_response(struct stream *s);
+
+static void http_capture_headers(struct htx *htx, char **cap, struct cap_hdr *cap_hdr);
+static int http_del_hdr_value(char *start, char *end, char **from, char *next);
+static size_t http_fmt_req_line(const struct htx_sl *sl, char *str, size_t len);
+static void http_debug_stline(const char *dir, struct stream *s, const struct htx_sl *sl);
+static void http_debug_hdr(const char *dir, struct stream *s, const struct ist n, const struct ist v);
+
+static enum rule_result http_req_get_intercept_rule(struct proxy *px, struct list *def_rules, struct list *rules, struct stream *s);
+static enum rule_result http_res_get_intercept_rule(struct proxy *px, struct list *def_rules, struct list *rules, struct stream *s);
+static enum rule_result http_req_restrict_header_names(struct stream *s, struct htx *htx, struct proxy *px);
+
+static void http_manage_client_side_cookies(struct stream *s, struct channel *req);
+static void http_manage_server_side_cookies(struct stream *s, struct channel *res);
+
+static int http_stats_check_uri(struct stream *s, struct http_txn *txn, struct proxy *backend);
+static int http_handle_stats(struct stream *s, struct channel *req);
+
+static int http_handle_expect_hdr(struct stream *s, struct htx *htx, struct http_msg *msg);
+static int http_reply_100_continue(struct stream *s);
+
+/* This stream analyser waits for a complete HTTP request. It returns 1 if the
+ * processing can continue on next analysers, or zero if it either needs more
+ * data or wants to immediately abort the request (eg: timeout, error, ...). It
+ * is tied to AN_REQ_WAIT_HTTP and may may remove itself from s->req.analysers
+ * when it has nothing left to do, and may remove any analyser when it wants to
+ * abort.
+ */
+int http_wait_for_request(struct stream *s, struct channel *req, int an_bit)
+{
+
+ /*
+ * We will analyze a complete HTTP request to check the its syntax.
+ *
+ * Once the start line and all headers are received, we may perform a
+ * capture of the error (if any), and we will set a few fields. We also
+ * check for monitor-uri, logging and finally headers capture.
+ */
+ struct session *sess = s->sess;
+ struct http_txn *txn = s->txn;
+ struct http_msg *msg = &txn->req;
+ struct htx *htx;
+ struct htx_sl *sl;
+
+ DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, msg);
+
+ if (unlikely(!IS_HTX_STRM(s))) {
+ /* It is only possible when a TCP stream is upgrade to HTTP.
+ * There is a transition period during which there is no
+ * data. The stream is still in raw mode and SF_IGNORE flag is
+ * still set. When this happens, the new mux is responsible to
+ * handle all errors. Thus we may leave immediately.
+ */
+ BUG_ON(!(s->flags & SF_IGNORE) || !c_empty(&s->req));
+
+ /* Don't connect for now */
+ channel_dont_connect(req);
+
+ /* A SHUTR at this stage means we are performing a "destructive"
+ * HTTP upgrade (TCP>H2). In this case, we can leave.
+ */
+ if (req->flags & CF_SHUTR) {
+ s->logs.logwait = 0;
+ s->logs.level = 0;
+ channel_abort(&s->req);
+ channel_abort(&s->res);
+ req->analysers &= AN_REQ_FLT_END;
+ req->analyse_exp = TICK_ETERNITY;
+ DBG_TRACE_LEAVE(STRM_EV_STRM_ANA, s);
+ return 1;
+ }
+ DBG_TRACE_LEAVE(STRM_EV_STRM_ANA, s);
+ return 0;
+ }
+
+ htx = htxbuf(&req->buf);
+
+ /* Parsing errors are caught here */
+ if (htx->flags & (HTX_FL_PARSING_ERROR|HTX_FL_PROCESSING_ERROR)) {
+ stream_inc_http_req_ctr(s);
+ proxy_inc_fe_req_ctr(sess->listener, sess->fe);
+ if (htx->flags & HTX_FL_PARSING_ERROR) {
+ stream_inc_http_err_ctr(s);
+ goto return_bad_req;
+ }
+ else
+ goto return_int_err;
+ }
+
+ /* we're speaking HTTP here, so let's speak HTTP to the client */
+ s->srv_error = http_return_srv_error;
+
+ msg->msg_state = HTTP_MSG_BODY;
+ stream_inc_http_req_ctr(s);
+ proxy_inc_fe_req_ctr(sess->listener, sess->fe); /* one more valid request for this FE */
+
+ /* kill the pending keep-alive timeout */
+ req->analyse_exp = TICK_ETERNITY;
+
+ BUG_ON(htx_get_first_type(htx) != HTX_BLK_REQ_SL);
+ sl = http_get_stline(htx);
+
+ /* 0: we might have to print this header in debug mode */
+ if (unlikely((global.mode & MODE_DEBUG) &&
+ (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)))) {
+ int32_t pos;
+
+ http_debug_stline("clireq", s, sl);
+
+ for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
+ struct htx_blk *blk = htx_get_blk(htx, pos);
+ enum htx_blk_type type = htx_get_blk_type(blk);
+
+ if (type == HTX_BLK_EOH)
+ break;
+ if (type != HTX_BLK_HDR)
+ continue;
+
+ http_debug_hdr("clihdr", s,
+ htx_get_blk_name(htx, blk),
+ htx_get_blk_value(htx, blk));
+ }
+ }
+
+ /*
+ * 1: identify the method and the version. Also set HTTP flags
+ */
+ txn->meth = sl->info.req.meth;
+ if (sl->flags & HTX_SL_F_VER_11)
+ msg->flags |= HTTP_MSGF_VER_11;
+ msg->flags |= HTTP_MSGF_XFER_LEN;
+ if (sl->flags & HTX_SL_F_CLEN)
+ msg->flags |= HTTP_MSGF_CNT_LEN;
+ else if (sl->flags & HTX_SL_F_CHNK)
+ msg->flags |= HTTP_MSGF_TE_CHNK;
+ if (sl->flags & HTX_SL_F_BODYLESS)
+ msg->flags |= HTTP_MSGF_BODYLESS;
+ if (sl->flags & HTX_SL_F_CONN_UPG)
+ msg->flags |= HTTP_MSGF_CONN_UPG;
+
+ /* we can make use of server redirect on GET and HEAD */
+ if (txn->meth == HTTP_METH_GET || txn->meth == HTTP_METH_HEAD)
+ s->flags |= SF_REDIRECTABLE;
+ else if (txn->meth == HTTP_METH_OTHER && isteqi(htx_sl_req_meth(sl), ist("PRI"))) {
+ /* PRI is reserved for the HTTP/2 preface */
+ goto return_bad_req;
+ }
+
+ /*
+ * 2: check if the URI matches the monitor_uri. We have to do this for
+ * every request which gets in, because the monitor-uri is defined by
+ * the frontend. If the monitor-uri starts with a '/', the matching is
+ * done against the request's path. Otherwise, the request's uri is
+ * used. It is a workaround to let HTTP/2 health-checks work as
+ * expected.
+ */
+ if (unlikely(isttest(sess->fe->monitor_uri))) {
+ const struct ist monitor_uri = sess->fe->monitor_uri;
+ struct http_uri_parser parser = http_uri_parser_init(htx_sl_req_uri(sl));
+
+ if ((istptr(monitor_uri)[0] == '/' &&
+ isteq(http_parse_path(&parser), monitor_uri)) ||
+ isteq(htx_sl_req_uri(sl), monitor_uri)) {
+ /*
+ * We have found the monitor URI
+ */
+ struct acl_cond *cond;
+
+ s->flags |= SF_MONITOR;
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.intercepted_req);
+
+ /* Check if we want to fail this monitor request or not */
+ list_for_each_entry(cond, &sess->fe->mon_fail_cond, list) {
+ int ret = acl_exec_cond(cond, sess->fe, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);
+
+ ret = acl_pass(ret);
+ if (cond->pol == ACL_COND_UNLESS)
+ ret = !ret;
+
+ if (ret) {
+ /* we fail this request, let's return 503 service unavail */
+ txn->status = 503;
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_LOCAL; /* we don't want a real error here */
+ goto return_prx_cond;
+ }
+ }
+
+ /* nothing to fail, let's reply normally */
+ txn->status = 200;
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_LOCAL; /* we don't want a real error here */
+ goto return_prx_cond;
+ }
+ }
+
+ /*
+ * 3: Maybe we have to copy the original REQURI for the logs ?
+ * Note: we cannot log anymore if the request has been
+ * classified as invalid.
+ */
+ if (unlikely(s->logs.logwait & LW_REQ)) {
+ /* we have a complete HTTP request that we must log */
+ if ((txn->uri = pool_alloc(pool_head_requri)) != NULL) {
+ size_t len;
+
+ len = http_fmt_req_line(sl, txn->uri, global.tune.requri_len - 1);
+ txn->uri[len] = 0;
+
+ if (!(s->logs.logwait &= ~(LW_REQ|LW_INIT)))
+ s->do_log(s);
+ } else {
+ ha_alert("HTTP logging : out of memory.\n");
+ }
+ }
+
+ /* if the frontend has "option http-use-proxy-header", we'll check if
+ * we have what looks like a proxied connection instead of a connection,
+ * and in this case set the TX_USE_PX_CONN flag to use Proxy-connection.
+ * Note that this is *not* RFC-compliant, however browsers and proxies
+ * happen to do that despite being non-standard :-(
+ * We consider that a request not beginning with either '/' or '*' is
+ * a proxied connection, which covers both "scheme://location" and
+ * CONNECT ip:port.
+ */
+ if ((sess->fe->options2 & PR_O2_USE_PXHDR) &&
+ *HTX_SL_REQ_UPTR(sl) != '/' && *HTX_SL_REQ_UPTR(sl) != '*')
+ txn->flags |= TX_USE_PX_CONN;
+
+ /* 5: we may need to capture headers */
+ if (unlikely((s->logs.logwait & LW_REQHDR) && s->req_cap))
+ http_capture_headers(htx, s->req_cap, sess->fe->req_cap);
+
+ /* we may have to wait for the request's body */
+ if (s->be->options & PR_O_WREQ_BODY)
+ req->analysers |= AN_REQ_HTTP_BODY;
+
+ /*
+ * RFC7234#4:
+ * A cache MUST write through requests with methods
+ * that are unsafe (Section 4.2.1 of [RFC7231]) to
+ * the origin server; i.e., a cache is not allowed
+ * to generate a reply to such a request before
+ * having forwarded the request and having received
+ * a corresponding response.
+ *
+ * RFC7231#4.2.1:
+ * Of the request methods defined by this
+ * specification, the GET, HEAD, OPTIONS, and TRACE
+ * methods are defined to be safe.
+ */
+ if (likely(txn->meth == HTTP_METH_GET ||
+ txn->meth == HTTP_METH_HEAD ||
+ txn->meth == HTTP_METH_OPTIONS ||
+ txn->meth == HTTP_METH_TRACE))
+ txn->flags |= TX_CACHEABLE | TX_CACHE_COOK;
+
+ /* end of job, return OK */
+ req->analysers &= ~an_bit;
+ req->analyse_exp = TICK_ETERNITY;
+
+ DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 1;
+
+ return_int_err:
+ txn->status = 500;
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_INTERNAL;
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.internal_errors);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->internal_errors);
+ goto return_prx_cond;
+
+ return_bad_req:
+ txn->status = 400;
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.failed_req);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->failed_req);
+ /* fall through */
+
+ return_prx_cond:
+ http_reply_and_close(s, txn->status, http_error_message(s));
+
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_PRXCOND;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_R;
+
+ DBG_TRACE_DEVEL("leaving on error",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 0;
+}
+
+
+/* This stream analyser runs all HTTP request processing which is common to
+ * frontends and backends, which means blocking ACLs, filters, connection-close,
+ * reqadd, stats and redirects. This is performed for the designated proxy.
+ * It returns 1 if the processing can continue on next analysers, or zero if it
+ * either needs more data or wants to immediately abort the request (eg: deny,
+ * error, ...).
+ */
+int http_process_req_common(struct stream *s, struct channel *req, int an_bit, struct proxy *px)
+{
+ struct list *def_rules, *rules;
+ struct session *sess = s->sess;
+ struct http_txn *txn = s->txn;
+ struct http_msg *msg = &txn->req;
+ struct htx *htx;
+ struct redirect_rule *rule;
+ enum rule_result verdict;
+ struct connection *conn = objt_conn(sess->origin);
+
+ DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, msg);
+
+ htx = htxbuf(&req->buf);
+
+ /* just in case we have some per-backend tracking. Only called the first
+ * execution of the analyser. */
+ if (!s->current_rule && !s->current_rule_list)
+ stream_inc_be_http_req_ctr(s);
+
+ def_rules = ((px->defpx && (an_bit == AN_REQ_HTTP_PROCESS_FE || px != sess->fe)) ? &px->defpx->http_req_rules : NULL);
+ rules = &px->http_req_rules;
+
+ /* evaluate http-request rules */
+ if ((def_rules && !LIST_ISEMPTY(def_rules)) || !LIST_ISEMPTY(rules)) {
+ verdict = http_req_get_intercept_rule(px, def_rules, rules, s);
+
+ switch (verdict) {
+ case HTTP_RULE_RES_YIELD: /* some data miss, call the function later. */
+ goto return_prx_yield;
+
+ case HTTP_RULE_RES_CONT:
+ case HTTP_RULE_RES_STOP: /* nothing to do */
+ break;
+
+ case HTTP_RULE_RES_DENY: /* deny or tarpit */
+ if (txn->flags & TX_CLTARPIT)
+ goto tarpit;
+ goto deny;
+
+ case HTTP_RULE_RES_ABRT: /* abort request, response already sent. Eg: auth */
+ goto return_prx_cond;
+
+ case HTTP_RULE_RES_DONE: /* OK, but terminate request processing (eg: redirect) */
+ goto done;
+
+ case HTTP_RULE_RES_BADREQ: /* failed with a bad request */
+ goto return_bad_req;
+
+ case HTTP_RULE_RES_ERROR: /* failed with a bad request */
+ goto return_int_err;
+ }
+ }
+
+ if (px->options2 & (PR_O2_RSTRICT_REQ_HDR_NAMES_BLK|PR_O2_RSTRICT_REQ_HDR_NAMES_DEL)) {
+ verdict = http_req_restrict_header_names(s, htx, px);
+ if (verdict == HTTP_RULE_RES_DENY)
+ goto deny;
+ }
+
+ if (conn && (conn->flags & CO_FL_EARLY_DATA) &&
+ (conn->flags & (CO_FL_EARLY_SSL_HS | CO_FL_SSL_WAIT_HS))) {
+ struct http_hdr_ctx ctx;
+
+ ctx.blk = NULL;
+ if (!http_find_header(htx, ist("Early-Data"), &ctx, 0)) {
+ if (unlikely(!http_add_header(htx, ist("Early-Data"), ist("1"))))
+ goto return_fail_rewrite;
+ }
+ }
+
+ /* OK at this stage, we know that the request was accepted according to
+ * the http-request rules, we can check for the stats. Note that the
+ * URI is detected *before* the req* rules in order not to be affected
+ * by a possible reqrep, while they are processed *after* so that a
+ * reqdeny can still block them. This clearly needs to change in 1.6!
+ */
+ if (!s->target && http_stats_check_uri(s, txn, px)) {
+ s->target = &http_stats_applet.obj_type;
+ if (unlikely(!sc_applet_create(s->scb, objt_applet(s->target)))) {
+ s->logs.tv_request = now;
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_RESOURCE;
+ goto return_int_err;
+ }
+
+ /* parse the whole stats request and extract the relevant information */
+ http_handle_stats(s, req);
+ verdict = http_req_get_intercept_rule(px, NULL, &px->uri_auth->http_req_rules, s);
+ /* not all actions implemented: deny, allow, auth */
+
+ if (verdict == HTTP_RULE_RES_DENY) /* stats http-request deny */
+ goto deny;
+
+ if (verdict == HTTP_RULE_RES_ABRT) /* stats auth / stats http-request auth */
+ goto return_prx_cond;
+
+ if (verdict == HTTP_RULE_RES_BADREQ) /* failed with a bad request */
+ goto return_bad_req;
+
+ if (verdict == HTTP_RULE_RES_ERROR) /* failed with a bad request */
+ goto return_int_err;
+ }
+
+ /* Proceed with the applets now. */
+ if (unlikely(objt_applet(s->target))) {
+ if (sess->fe == s->be) /* report it if the request was intercepted by the frontend */
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.intercepted_req);
+
+ if (http_handle_expect_hdr(s, htx, msg) == -1)
+ goto return_int_err;
+
+ if (!(s->flags & SF_ERR_MASK)) // this is not really an error but it is
+ s->flags |= SF_ERR_LOCAL; // to mark that it comes from the proxy
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_R;
+
+ if (HAS_FILTERS(s))
+ req->analysers |= AN_REQ_FLT_HTTP_HDRS;
+
+ /* enable the minimally required analyzers to handle keep-alive and compression on the HTTP response */
+ req->analysers &= (AN_REQ_HTTP_BODY | AN_REQ_FLT_HTTP_HDRS | AN_REQ_FLT_END);
+ req->analysers &= ~AN_REQ_FLT_XFER_DATA;
+ req->analysers |= AN_REQ_HTTP_XFER_BODY;
+
+ req->flags |= CF_SEND_DONTWAIT;
+ s->flags |= SF_ASSIGNED;
+ goto done;
+ }
+
+ /* check whether we have some ACLs set to redirect this request */
+ list_for_each_entry(rule, &px->redirect_rules, list) {
+ if (rule->cond) {
+ int ret;
+
+ ret = acl_exec_cond(rule->cond, px, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);
+ ret = acl_pass(ret);
+ if (rule->cond->pol == ACL_COND_UNLESS)
+ ret = !ret;
+ if (!ret)
+ continue;
+ }
+ if (!http_apply_redirect_rule(rule, s, txn))
+ goto return_int_err;
+ goto done;
+ }
+
+ /* POST requests may be accompanied with an "Expect: 100-Continue" header.
+ * If this happens, then the data will not come immediately, so we must
+ * send all what we have without waiting. Note that due to the small gain
+ * in waiting for the body of the request, it's easier to simply put the
+ * CF_SEND_DONTWAIT flag any time. It's a one-shot flag so it will remove
+ * itself once used.
+ */
+ req->flags |= CF_SEND_DONTWAIT;
+
+ done: /* done with this analyser, continue with next ones that the calling
+ * points will have set, if any.
+ */
+ req->analyse_exp = TICK_ETERNITY;
+ done_without_exp: /* done with this analyser, but don't reset the analyse_exp. */
+ req->analysers &= ~an_bit;
+ s->current_rule = s->current_rule_list = NULL;
+ DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 1;
+
+ tarpit:
+ /* Allow cookie logging
+ */
+ if (s->be->cookie_name || sess->fe->capture_name)
+ http_manage_client_side_cookies(s, req);
+
+ /* When a connection is tarpitted, we use the tarpit timeout,
+ * which may be the same as the connect timeout if unspecified.
+ * If unset, then set it to zero because we really want it to
+ * eventually expire. We build the tarpit as an analyser.
+ */
+ channel_htx_erase(&s->req, htx);
+
+ /* wipe the request out so that we can drop the connection early
+ * if the client closes first.
+ */
+ channel_dont_connect(req);
+
+ req->analysers &= AN_REQ_FLT_END; /* remove switching rules etc... */
+ req->analysers |= AN_REQ_HTTP_TARPIT;
+ req->analyse_exp = tick_add_ifset(now_ms, s->be->timeout.tarpit);
+ if (!req->analyse_exp)
+ req->analyse_exp = tick_add(now_ms, 0);
+ stream_inc_http_err_ctr(s);
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.denied_req);
+ if (s->flags & SF_BE_ASSIGNED)
+ _HA_ATOMIC_INC(&s->be->be_counters.denied_req);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->denied_req);
+ goto done_without_exp;
+
+ deny: /* this request was blocked (denied) */
+
+ /* Allow cookie logging
+ */
+ if (s->be->cookie_name || sess->fe->capture_name)
+ http_manage_client_side_cookies(s, req);
+
+ s->logs.tv_request = now;
+ stream_inc_http_err_ctr(s);
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.denied_req);
+ if (s->flags & SF_BE_ASSIGNED)
+ _HA_ATOMIC_INC(&s->be->be_counters.denied_req);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->denied_req);
+ goto return_prx_err;
+
+ return_fail_rewrite:
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_PRXCOND;
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.failed_rewrites);
+ if (s->flags & SF_BE_ASSIGNED)
+ _HA_ATOMIC_INC(&s->be->be_counters.failed_rewrites);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->failed_rewrites);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_rewrites);
+ /* fall through */
+
+ return_int_err:
+ txn->status = 500;
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_INTERNAL;
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.internal_errors);
+ if (s->flags & SF_BE_ASSIGNED)
+ _HA_ATOMIC_INC(&s->be->be_counters.internal_errors);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->internal_errors);
+ goto return_prx_err;
+
+ return_bad_req:
+ txn->status = 400;
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.failed_req);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->failed_req);
+ /* fall through */
+
+ return_prx_err:
+ http_reply_and_close(s, txn->status, http_error_message(s));
+ /* fall through */
+
+ return_prx_cond:
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_PRXCOND;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_R;
+
+ req->analysers &= AN_REQ_FLT_END;
+ req->analyse_exp = TICK_ETERNITY;
+ s->current_rule = s->current_rule_list = NULL;
+ DBG_TRACE_DEVEL("leaving on error",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 0;
+
+ return_prx_yield:
+ channel_dont_connect(req);
+ DBG_TRACE_DEVEL("waiting for more data",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+}
+
+/* This function performs all the processing enabled for the current request.
+ * It returns 1 if the processing can continue on next analysers, or zero if it
+ * needs more data, encounters an error, or wants to immediately abort the
+ * request. It relies on buffers flags, and updates s->req.analysers.
+ */
+int http_process_request(struct stream *s, struct channel *req, int an_bit)
+{
+ struct session *sess = s->sess;
+ struct http_txn *txn = s->txn;
+ struct htx *htx;
+ struct connection *cli_conn = objt_conn(strm_sess(s)->origin);
+
+ DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+
+ /*
+ * Right now, we know that we have processed the entire headers
+ * and that unwanted requests have been filtered out. We can do
+ * whatever we want with the remaining request. Also, now we
+ * may have separate values for ->fe, ->be.
+ */
+ htx = htxbuf(&req->buf);
+
+ /*
+ * 7: Now we can work with the cookies.
+ * Note that doing so might move headers in the request, but
+ * the fields will stay coherent and the URI will not move.
+ * This should only be performed in the backend.
+ */
+ if (s->be->cookie_name || sess->fe->capture_name)
+ http_manage_client_side_cookies(s, req);
+
+ /* 8: Generate unique ID if a "unique-id-format" is defined.
+ *
+ * A unique ID is generated even when it is not sent to ensure that the ID can make use of
+ * fetches only available in the HTTP request processing stage.
+ */
+ if (!LIST_ISEMPTY(&sess->fe->format_unique_id)) {
+ struct ist unique_id = stream_generate_unique_id(s, &sess->fe->format_unique_id);
+
+ if (!isttest(unique_id)) {
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_RESOURCE;
+ goto return_int_err;
+ }
+
+ /* send unique ID if a "unique-id-header" is defined */
+ if (isttest(sess->fe->header_unique_id) &&
+ unlikely(!http_add_header(htx, sess->fe->header_unique_id, unique_id)))
+ goto return_fail_rewrite;
+ }
+
+ /*
+ * 9: add X-Forwarded-For if either the frontend or the backend
+ * asks for it.
+ */
+ if ((sess->fe->options | s->be->options) & PR_O_FWDFOR) {
+ const struct sockaddr_storage *src = sc_src(s->scf);
+ struct http_hdr_ctx ctx = { .blk = NULL };
+ struct ist hdr = isttest(s->be->fwdfor_hdr_name) ? s->be->fwdfor_hdr_name : sess->fe->fwdfor_hdr_name;
+
+ if (!((sess->fe->options | s->be->options) & PR_O_FF_ALWAYS) &&
+ http_find_header(htx, hdr, &ctx, 0)) {
+ /* The header is set to be added only if none is present
+ * and we found it, so don't do anything.
+ */
+ }
+ else if (src && src->ss_family == AF_INET) {
+ /* Add an X-Forwarded-For header unless the source IP is
+ * in the 'except' network range.
+ */
+ if (ipcmp2net(src, &sess->fe->except_xff_net) &&
+ ipcmp2net(src, &s->be->except_xff_net)) {
+ unsigned char *pn = (unsigned char *)&((struct sockaddr_in *)src)->sin_addr;
+
+ /* Note: we rely on the backend to get the header name to be used for
+ * x-forwarded-for, because the header is really meant for the backends.
+ * However, if the backend did not specify any option, we have to rely
+ * on the frontend's header name.
+ */
+ chunk_printf(&trash, "%d.%d.%d.%d", pn[0], pn[1], pn[2], pn[3]);
+ if (unlikely(!http_add_header(htx, hdr, ist2(trash.area, trash.data))))
+ goto return_fail_rewrite;
+ }
+ }
+ else if (src && src->ss_family == AF_INET6) {
+ /* Add an X-Forwarded-For header unless the source IP is
+ * in the 'except' network range.
+ */
+ if (ipcmp2net(src, &sess->fe->except_xff_net) &&
+ ipcmp2net(src, &s->be->except_xff_net)) {
+ char pn[INET6_ADDRSTRLEN];
+
+ inet_ntop(AF_INET6,
+ (const void *)&((struct sockaddr_in6 *)(src))->sin6_addr,
+ pn, sizeof(pn));
+
+ /* Note: we rely on the backend to get the header name to be used for
+ * x-forwarded-for, because the header is really meant for the backends.
+ * However, if the backend did not specify any option, we have to rely
+ * on the frontend's header name.
+ */
+ chunk_printf(&trash, "%s", pn);
+ if (unlikely(!http_add_header(htx, hdr, ist2(trash.area, trash.data))))
+ goto return_fail_rewrite;
+ }
+ }
+ }
+
+ /*
+ * 10: add X-Original-To if either the frontend or the backend
+ * asks for it.
+ */
+ if ((sess->fe->options | s->be->options) & PR_O_ORGTO) {
+ const struct sockaddr_storage *dst = sc_dst(s->scf);
+ struct ist hdr = isttest(s->be->orgto_hdr_name) ? s->be->orgto_hdr_name : sess->fe->orgto_hdr_name;
+
+ if (dst && dst->ss_family == AF_INET) {
+ /* Add an X-Original-To header unless the destination IP is
+ * in the 'except' network range.
+ */
+ if (ipcmp2net(dst, &sess->fe->except_xot_net) &&
+ ipcmp2net(dst, &s->be->except_xot_net)) {
+ unsigned char *pn = (unsigned char *)&((struct sockaddr_in *)dst)->sin_addr;
+
+ /* Note: we rely on the backend to get the header name to be used for
+ * x-original-to, because the header is really meant for the backends.
+ * However, if the backend did not specify any option, we have to rely
+ * on the frontend's header name.
+ */
+ chunk_printf(&trash, "%d.%d.%d.%d", pn[0], pn[1], pn[2], pn[3]);
+ if (unlikely(!http_add_header(htx, hdr, ist2(trash.area, trash.data))))
+ goto return_fail_rewrite;
+ }
+ }
+ else if (dst && dst->ss_family == AF_INET6) {
+ /* Add an X-Original-To header unless the source IP is
+ * in the 'except' network range.
+ */
+ if (ipcmp2net(dst, &sess->fe->except_xot_net) &&
+ ipcmp2net(dst, &s->be->except_xot_net)) {
+ char pn[INET6_ADDRSTRLEN];
+
+ inet_ntop(AF_INET6,
+ (const void *)&((struct sockaddr_in6 *)dst)->sin6_addr,
+ pn, sizeof(pn));
+
+ /* Note: we rely on the backend to get the header name to be used for
+ * x-forwarded-for, because the header is really meant for the backends.
+ * However, if the backend did not specify any option, we have to rely
+ * on the frontend's header name.
+ */
+ chunk_printf(&trash, "%s", pn);
+ if (unlikely(!http_add_header(htx, hdr, ist2(trash.area, trash.data))))
+ goto return_fail_rewrite;
+ }
+ }
+ }
+
+ /* Filter the request headers if there are filters attached to the
+ * stream.
+ */
+ if (HAS_FILTERS(s))
+ req->analysers |= AN_REQ_FLT_HTTP_HDRS;
+
+ /* If we have no server assigned yet and we're balancing on url_param
+ * with a POST request, we may be interested in checking the body for
+ * that parameter. This will be done in another analyser.
+ */
+ if (!(s->flags & (SF_ASSIGNED|SF_DIRECT)) &&
+ s->txn->meth == HTTP_METH_POST &&
+ (s->be->lbprm.algo & BE_LB_ALGO) == BE_LB_ALGO_PH) {
+ channel_dont_connect(req);
+ req->analysers |= AN_REQ_HTTP_BODY;
+ }
+
+ req->analysers &= ~AN_REQ_FLT_XFER_DATA;
+ req->analysers |= AN_REQ_HTTP_XFER_BODY;
+
+ /* We expect some data from the client. Unless we know for sure
+ * we already have a full request, we have to re-enable quick-ack
+ * in case we previously disabled it, otherwise we might cause
+ * the client to delay further data.
+ */
+ if ((sess->listener && (sess->listener->options & LI_O_NOQUICKACK)) && !(htx->flags & HTX_FL_EOM))
+ conn_set_quickack(cli_conn, 1);
+
+ /*************************************************************
+ * OK, that's finished for the headers. We have done what we *
+ * could. Let's switch to the DATA state. *
+ ************************************************************/
+ req->analyse_exp = TICK_ETERNITY;
+ req->analysers &= ~an_bit;
+
+ s->logs.tv_request = now;
+ /* OK let's go on with the BODY now */
+ DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 1;
+
+ return_fail_rewrite:
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_PRXCOND;
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.failed_rewrites);
+ if (s->flags & SF_BE_ASSIGNED)
+ _HA_ATOMIC_INC(&s->be->be_counters.failed_rewrites);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->failed_rewrites);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_rewrites);
+ /* fall through */
+
+ return_int_err:
+ txn->status = 500;
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_INTERNAL;
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.internal_errors);
+ if (s->flags & SF_BE_ASSIGNED)
+ _HA_ATOMIC_INC(&s->be->be_counters.internal_errors);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->internal_errors);
+
+ http_reply_and_close(s, txn->status, http_error_message(s));
+
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_PRXCOND;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_R;
+
+ DBG_TRACE_DEVEL("leaving on error",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 0;
+}
+
+/* This function is an analyser which processes the HTTP tarpit. It always
+ * returns zero, at the beginning because it prevents any other processing
+ * from occurring, and at the end because it terminates the request.
+ */
+int http_process_tarpit(struct stream *s, struct channel *req, int an_bit)
+{
+ struct http_txn *txn = s->txn;
+
+ DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, &txn->req);
+ /* This connection is being tarpitted. The CLIENT side has
+ * already set the connect expiration date to the right
+ * timeout. We just have to check that the client is still
+ * there and that the timeout has not expired.
+ */
+ channel_dont_connect(req);
+ if ((req->flags & (CF_SHUTR|CF_READ_ERROR)) == 0 &&
+ !tick_is_expired(req->analyse_exp, now_ms)) {
+ /* Be sure to drain all data from the request channel */
+ channel_htx_erase(req, htxbuf(&req->buf));
+ DBG_TRACE_DEVEL("waiting for tarpit timeout expiry",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+ }
+
+
+ /* We will set the queue timer to the time spent, just for
+ * logging purposes. We fake a 500 server error, so that the
+ * attacker will not suspect his connection has been tarpitted.
+ * It will not cause trouble to the logs because we can exclude
+ * the tarpitted connections by filtering on the 'PT' status flags.
+ */
+ s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
+
+ http_reply_and_close(s, txn->status, (!(req->flags & CF_READ_ERROR) ? http_error_message(s) : NULL));
+
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_PRXCOND;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_T;
+
+ DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+}
+
+/* This function is an analyser which waits for the HTTP request body. It waits
+ * for either the buffer to be full, or the full advertised contents to have
+ * reached the buffer. It must only be called after the standard HTTP request
+ * processing has occurred, because it expects the request to be parsed and will
+ * look for the Expect header. It may send a 100-Continue interim response. It
+ * takes in input any state starting from HTTP_MSG_BODY and leaves with one of
+ * HTTP_MSG_CHK_SIZE, HTTP_MSG_DATA or HTTP_MSG_TRAILERS. It returns zero if it
+ * needs to read more data, or 1 once it has completed its analysis.
+ */
+int http_wait_for_request_body(struct stream *s, struct channel *req, int an_bit)
+{
+ struct session *sess = s->sess;
+ struct http_txn *txn = s->txn;
+
+ DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, &s->txn->req);
+
+
+ switch (http_wait_for_msg_body(s, req, s->be->timeout.httpreq, 0)) {
+ case HTTP_RULE_RES_CONT:
+ goto http_end;
+ case HTTP_RULE_RES_YIELD:
+ goto missing_data_or_waiting;
+ case HTTP_RULE_RES_BADREQ:
+ goto return_bad_req;
+ case HTTP_RULE_RES_ERROR:
+ goto return_int_err;
+ case HTTP_RULE_RES_ABRT:
+ goto return_prx_cond;
+ default:
+ goto return_int_err;
+ }
+
+ http_end:
+ /* The situation will not evolve, so let's give up on the analysis. */
+ s->logs.tv_request = now; /* update the request timer to reflect full request */
+ req->analysers &= ~an_bit;
+ req->analyse_exp = TICK_ETERNITY;
+ DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 1;
+
+ missing_data_or_waiting:
+ channel_dont_connect(req);
+ DBG_TRACE_DEVEL("waiting for more data",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+
+ return_int_err:
+ txn->status = 500;
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_INTERNAL;
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.internal_errors);
+ if (s->flags & SF_BE_ASSIGNED)
+ _HA_ATOMIC_INC(&s->be->be_counters.internal_errors);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->internal_errors);
+ goto return_prx_err;
+
+ return_bad_req: /* let's centralize all bad requests */
+ txn->status = 400;
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.failed_req);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->failed_req);
+ /* fall through */
+
+ return_prx_err:
+ http_reply_and_close(s, txn->status, http_error_message(s));
+ /* fall through */
+
+ return_prx_cond:
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_PRXCOND;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_R;
+
+ req->analysers &= AN_REQ_FLT_END;
+ req->analyse_exp = TICK_ETERNITY;
+ DBG_TRACE_DEVEL("leaving on error",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 0;
+}
+
+/* This function is an analyser which forwards request body (including chunk
+ * sizes if any). It is called as soon as we must forward, even if we forward
+ * zero byte. The only situation where it must not be called is when we're in
+ * tunnel mode and we want to forward till the close. It's used both to forward
+ * remaining data and to resync after end of body. It expects the msg_state to
+ * be between MSG_BODY and MSG_DONE (inclusive). It returns zero if it needs to
+ * read more data, or 1 once we can go on with next request or end the stream.
+ * When in MSG_DATA or MSG_TRAILERS, it will automatically forward chunk_len
+ * bytes of pending data + the headers if not already done.
+ */
+int http_request_forward_body(struct stream *s, struct channel *req, int an_bit)
+{
+ struct session *sess = s->sess;
+ struct http_txn *txn = s->txn;
+ struct http_msg *msg = &txn->req;
+ struct htx *htx;
+ short status = 0;
+ int ret;
+
+ DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, msg);
+
+ htx = htxbuf(&req->buf);
+
+ if (htx->flags & HTX_FL_PARSING_ERROR)
+ goto return_bad_req;
+ if (htx->flags & HTX_FL_PROCESSING_ERROR)
+ goto return_int_err;
+
+ if ((req->flags & (CF_READ_ERROR|CF_READ_TIMEOUT|CF_WRITE_ERROR|CF_WRITE_TIMEOUT)) ||
+ ((req->flags & CF_SHUTW) && (req->to_forward || co_data(req)))) {
+ /* Output closed while we were sending data. We must abort and
+ * wake the other side up.
+ *
+ * If we have finished to send the request and the response is
+ * still in progress, don't catch write error on the request
+ * side if it is in fact a read error on the server side.
+ */
+ if (msg->msg_state == HTTP_MSG_DONE && (s->res.flags & CF_READ_ERROR) && s->res.analysers)
+ return 0;
+
+ /* Don't abort yet if we had L7 retries activated and it
+ * was a write error, we may recover.
+ */
+ if (!(req->flags & (CF_READ_ERROR | CF_READ_TIMEOUT)) &&
+ (txn->flags & TX_L7_RETRY)) {
+ DBG_TRACE_DEVEL("leaving on L7 retry",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 0;
+ }
+ msg->msg_state = HTTP_MSG_ERROR;
+ http_end_request(s);
+ http_end_response(s);
+ DBG_TRACE_DEVEL("leaving on error",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 1;
+ }
+
+ /* Note that we don't have to send 100-continue back because we don't
+ * need the data to complete our job, and it's up to the server to
+ * decide whether to return 100, 417 or anything else in return of
+ * an "Expect: 100-continue" header.
+ */
+ if (msg->msg_state == HTTP_MSG_BODY)
+ msg->msg_state = HTTP_MSG_DATA;
+
+ /* in most states, we should abort in case of early close */
+ channel_auto_close(req);
+
+ if (req->to_forward) {
+ if (req->to_forward == CHN_INFINITE_FORWARD) {
+ if (req->flags & CF_EOI)
+ msg->msg_state = HTTP_MSG_ENDING;
+ }
+ else {
+ /* We can't process the buffer's contents yet */
+ req->flags |= CF_WAKE_WRITE;
+ goto missing_data_or_waiting;
+ }
+ }
+
+ if (msg->msg_state >= HTTP_MSG_ENDING)
+ goto ending;
+
+ if (txn->meth == HTTP_METH_CONNECT) {
+ msg->msg_state = HTTP_MSG_ENDING;
+ goto ending;
+ }
+
+ /* Forward input data. We get it by removing all outgoing data not
+ * forwarded yet from HTX data size. If there are some data filters, we
+ * let them decide the amount of data to forward.
+ */
+ if (HAS_REQ_DATA_FILTERS(s)) {
+ ret = flt_http_payload(s, msg, htx->data);
+ if (ret < 0)
+ goto return_bad_req;
+ c_adv(req, ret);
+ }
+ else {
+ c_adv(req, htx->data - co_data(req));
+ if (msg->flags & HTTP_MSGF_XFER_LEN)
+ channel_htx_forward_forever(req, htx);
+ }
+
+ if (htx->data != co_data(req))
+ goto missing_data_or_waiting;
+
+ /* Check if the end-of-message is reached and if so, switch the message
+ * in HTTP_MSG_ENDING state. Then if all data was marked to be
+ * forwarded, set the state to HTTP_MSG_DONE.
+ */
+ if (!(htx->flags & HTX_FL_EOM))
+ goto missing_data_or_waiting;
+
+ msg->msg_state = HTTP_MSG_ENDING;
+
+ ending:
+ req->flags &= ~CF_EXPECT_MORE; /* no more data are expected */
+
+ /* other states, ENDING...TUNNEL */
+ if (msg->msg_state >= HTTP_MSG_DONE)
+ goto done;
+
+ if (HAS_REQ_DATA_FILTERS(s)) {
+ ret = flt_http_end(s, msg);
+ if (ret <= 0) {
+ if (!ret)
+ goto missing_data_or_waiting;
+ goto return_bad_req;
+ }
+ }
+
+ if (txn->meth == HTTP_METH_CONNECT)
+ msg->msg_state = HTTP_MSG_TUNNEL;
+ else {
+ msg->msg_state = HTTP_MSG_DONE;
+ req->to_forward = 0;
+ }
+
+ done:
+ /* we don't want to forward closes on DONE except in tunnel mode. */
+ if (!(txn->flags & TX_CON_WANT_TUN))
+ channel_dont_close(req);
+
+ http_end_request(s);
+ if (!(req->analysers & an_bit)) {
+ http_end_response(s);
+ if (unlikely(msg->msg_state == HTTP_MSG_ERROR)) {
+ if (req->flags & CF_SHUTW) {
+ /* request errors are most likely due to the
+ * server aborting the transfer. */
+ goto return_srv_abort;
+ }
+ goto return_bad_req;
+ }
+ DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 1;
+ }
+
+ /* If "option abortonclose" is set on the backend, we want to monitor
+ * the client's connection and forward any shutdown notification to the
+ * server, which will decide whether to close or to go on processing the
+ * request. We only do that in tunnel mode, and not in other modes since
+ * it can be abused to exhaust source ports. */
+ if (s->be->options & PR_O_ABRT_CLOSE) {
+ channel_auto_read(req);
+ if ((req->flags & (CF_SHUTR|CF_READ_NULL)) && !(txn->flags & TX_CON_WANT_TUN))
+ s->scb->flags |= SC_FL_NOLINGER;
+ channel_auto_close(req);
+ }
+ else if (s->txn->meth == HTTP_METH_POST) {
+ /* POST requests may require to read extra CRLF sent by broken
+ * browsers and which could cause an RST to be sent upon close
+ * on some systems (eg: Linux). */
+ channel_auto_read(req);
+ }
+ DBG_TRACE_DEVEL("waiting for the end of the HTTP txn",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+
+ missing_data_or_waiting:
+ /* stop waiting for data if the input is closed before the end */
+ if (msg->msg_state < HTTP_MSG_ENDING && req->flags & CF_SHUTR)
+ goto return_cli_abort;
+
+ waiting:
+ /* waiting for the last bits to leave the buffer */
+ if (req->flags & CF_SHUTW)
+ goto return_srv_abort;
+
+ /* When TE: chunked is used, we need to get there again to parse remaining
+ * chunks even if the client has closed, so we don't want to set CF_DONTCLOSE.
+ * And when content-length is used, we never want to let the possible
+ * shutdown be forwarded to the other side, as the state machine will
+ * take care of it once the client responds. It's also important to
+ * prevent TIME_WAITs from accumulating on the backend side, and for
+ * HTTP/2 where the last frame comes with a shutdown.
+ */
+ if (msg->flags & HTTP_MSGF_XFER_LEN)
+ channel_dont_close(req);
+
+ /* We know that more data are expected, but we couldn't send more that
+ * what we did. So we always set the CF_EXPECT_MORE flag so that the
+ * system knows it must not set a PUSH on this first part. Interactive
+ * modes are already handled by the stream sock layer. We must not do
+ * this in content-length mode because it could present the MSG_MORE
+ * flag with the last block of forwarded data, which would cause an
+ * additional delay to be observed by the receiver.
+ */
+ if (HAS_REQ_DATA_FILTERS(s))
+ req->flags |= CF_EXPECT_MORE;
+
+ DBG_TRACE_DEVEL("waiting for more data to forward",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+
+ return_cli_abort:
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.cli_aborts);
+ _HA_ATOMIC_INC(&s->be->be_counters.cli_aborts);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->cli_aborts);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.cli_aborts);
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_CLICL;
+ status = 400;
+ goto return_prx_cond;
+
+ return_srv_abort:
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.srv_aborts);
+ _HA_ATOMIC_INC(&s->be->be_counters.srv_aborts);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->srv_aborts);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.srv_aborts);
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_SRVCL;
+ status = 502;
+ goto return_prx_cond;
+
+ return_int_err:
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_INTERNAL;
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.internal_errors);
+ _HA_ATOMIC_INC(&s->be->be_counters.internal_errors);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->internal_errors);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.internal_errors);
+ status = 500;
+ goto return_prx_cond;
+
+ return_bad_req:
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.failed_req);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->failed_req);
+ status = 400;
+ /* fall through */
+
+ return_prx_cond:
+ if (txn->status > 0) {
+ /* Note: we don't send any error if some data were already sent */
+ http_reply_and_close(s, txn->status, NULL);
+ } else {
+ txn->status = status;
+ http_reply_and_close(s, txn->status, http_error_message(s));
+ }
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_PRXCOND;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= ((txn->rsp.msg_state < HTTP_MSG_ERROR) ? SF_FINST_H : SF_FINST_D);
+ DBG_TRACE_DEVEL("leaving on error ",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 0;
+}
+
+/* Reset the stream and the backend stream connector to a situation suitable for attemption connection */
+/* Returns 0 if we can attempt to retry, -1 otherwise */
+static __inline int do_l7_retry(struct stream *s, struct stconn *sc)
+{
+ struct channel *req, *res;
+ int co_data;
+
+ if (s->conn_retries >= s->be->conn_retries)
+ return -1;
+ s->conn_retries++;
+ if (objt_server(s->target)) {
+ if (s->flags & SF_CURR_SESS) {
+ s->flags &= ~SF_CURR_SESS;
+ _HA_ATOMIC_DEC(&__objt_server(s->target)->cur_sess);
+ }
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.retries);
+ }
+ _HA_ATOMIC_INC(&s->be->be_counters.retries);
+
+ req = &s->req;
+ res = &s->res;
+ /* Remove any write error from the request, and read error from the response */
+ req->flags &= ~(CF_WRITE_ERROR | CF_WRITE_TIMEOUT | CF_SHUTW | CF_SHUTW_NOW);
+ res->flags &= ~(CF_READ_ERROR | CF_READ_TIMEOUT | CF_SHUTR | CF_EOI | CF_READ_NULL | CF_SHUTR_NOW);
+ res->analysers &= AN_RES_FLT_END;
+ s->conn_err_type = STRM_ET_NONE;
+ s->flags &= ~(SF_CONN_EXP | SF_ERR_MASK | SF_FINST_MASK);
+ s->conn_exp = TICK_ETERNITY;
+ stream_choose_redispatch(s);
+ res->rex = TICK_ETERNITY;
+ res->to_forward = 0;
+ res->analyse_exp = TICK_ETERNITY;
+ res->total = 0;
+
+ if (sc_reset_endp(s->scb) < 0) {
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_INTERNAL;
+ return -1;
+ }
+
+ b_free(&req->buf);
+ /* Swap the L7 buffer with the channel buffer */
+ /* We know we stored the co_data as b_data, so get it there */
+ co_data = b_data(&s->txn->l7_buffer);
+ b_set_data(&s->txn->l7_buffer, b_size(&s->txn->l7_buffer));
+ b_xfer(&req->buf, &s->txn->l7_buffer, b_data(&s->txn->l7_buffer));
+ co_set_data(req, co_data);
+
+ DBG_TRACE_DEVEL("perform a L7 retry", STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, s->txn);
+
+ b_reset(&res->buf);
+ co_set_data(res, 0);
+ return 0;
+}
+
+/* This stream analyser waits for a complete HTTP response. It returns 1 if the
+ * processing can continue on next analysers, or zero if it either needs more
+ * data or wants to immediately abort the response (eg: timeout, error, ...). It
+ * is tied to AN_RES_WAIT_HTTP and may may remove itself from s->res.analysers
+ * when it has nothing left to do, and may remove any analyser when it wants to
+ * abort.
+ */
+int http_wait_for_response(struct stream *s, struct channel *rep, int an_bit)
+{
+ /*
+ * We will analyze a complete HTTP response to check the its syntax.
+ *
+ * Once the start line and all headers are received, we may perform a
+ * capture of the error (if any), and we will set a few fields. We also
+ * logging and finally headers capture.
+ */
+ struct session *sess = s->sess;
+ struct http_txn *txn = s->txn;
+ struct http_msg *msg = &txn->rsp;
+ struct htx *htx;
+ struct connection *srv_conn;
+ struct htx_sl *sl;
+ int n;
+
+ DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, msg);
+
+ htx = htxbuf(&rep->buf);
+
+ /* Parsing errors are caught here */
+ if (htx->flags & HTX_FL_PARSING_ERROR)
+ goto return_bad_res;
+ if (htx->flags & HTX_FL_PROCESSING_ERROR)
+ goto return_int_err;
+
+ /*
+ * Now we quickly check if we have found a full valid response.
+ * If not so, we check the FD and buffer states before leaving.
+ * A full response is indicated by the fact that we have seen
+ * the double LF/CRLF, so the state is >= HTTP_MSG_BODY. Invalid
+ * responses are checked first.
+ *
+ * Depending on whether the client is still there or not, we
+ * may send an error response back or not. Note that normally
+ * we should only check for HTTP status there, and check I/O
+ * errors somewhere else.
+ */
+ next_one:
+ if (unlikely(htx_is_empty(htx) || htx->first == -1)) {
+ /* 1: have we encountered a read error ? */
+ if (rep->flags & CF_READ_ERROR) {
+ struct connection *conn = sc_conn(s->scb);
+
+
+ if ((txn->flags & TX_L7_RETRY) &&
+ (s->be->retry_type & PR_RE_DISCONNECTED) &&
+ (!conn || conn->err_code != CO_ER_SSL_EARLY_FAILED)) {
+ if (co_data(rep) || do_l7_retry(s, s->scb) == 0)
+ return 0;
+ }
+
+ /* Perform a L7 retry on empty response or because server refuses the early data. */
+ if ((txn->flags & TX_L7_RETRY) &&
+ (s->be->retry_type & PR_RE_EARLY_ERROR) &&
+ conn && conn->err_code == CO_ER_SSL_EARLY_FAILED &&
+ do_l7_retry(s, s->scb) == 0) {
+ DBG_TRACE_DEVEL("leaving on L7 retry",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+ }
+
+ if (txn->flags & TX_NOT_FIRST)
+ goto abort_keep_alive;
+
+ _HA_ATOMIC_INC(&s->be->be_counters.failed_resp);
+ if (objt_server(s->target)) {
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_resp);
+ health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_READ_ERROR);
+ }
+
+ /* if the server refused the early data, just send a 425 */
+ if (conn && conn->err_code == CO_ER_SSL_EARLY_FAILED)
+ txn->status = 425;
+ else {
+ txn->status = 502;
+ stream_inc_http_fail_ctr(s);
+ }
+
+ s->scb->flags |= SC_FL_NOLINGER;
+ http_reply_and_close(s, txn->status, http_error_message(s));
+
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_SRVCL;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_H;
+ DBG_TRACE_DEVEL("leaving on error",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 0;
+ }
+
+ /* 2: read timeout : return a 504 to the client. */
+ else if (rep->flags & CF_READ_TIMEOUT) {
+ if ((txn->flags & TX_L7_RETRY) &&
+ (s->be->retry_type & PR_RE_TIMEOUT)) {
+ if (co_data(rep) || do_l7_retry(s, s->scb) == 0) {
+ DBG_TRACE_DEVEL("leaving on L7 retry",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+ }
+ }
+ _HA_ATOMIC_INC(&s->be->be_counters.failed_resp);
+ if (objt_server(s->target)) {
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_resp);
+ health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_READ_TIMEOUT);
+ }
+
+ txn->status = 504;
+ stream_inc_http_fail_ctr(s);
+ s->scb->flags |= SC_FL_NOLINGER;
+ http_reply_and_close(s, txn->status, http_error_message(s));
+
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_SRVTO;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_H;
+ DBG_TRACE_DEVEL("leaving on error",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 0;
+ }
+
+ /* 3: client abort with an abortonclose */
+ else if ((rep->flags & CF_SHUTR) && ((s->req.flags & (CF_SHUTR|CF_SHUTW)) == (CF_SHUTR|CF_SHUTW))) {
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.cli_aborts);
+ _HA_ATOMIC_INC(&s->be->be_counters.cli_aborts);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->cli_aborts);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.cli_aborts);
+
+ txn->status = 400;
+ http_reply_and_close(s, txn->status, http_error_message(s));
+
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_CLICL;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_H;
+
+ /* process_stream() will take care of the error */
+ DBG_TRACE_DEVEL("leaving on error",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 0;
+ }
+
+ /* 4: close from server, capture the response if the server has started to respond */
+ else if (rep->flags & CF_SHUTR) {
+ if ((txn->flags & TX_L7_RETRY) &&
+ (s->be->retry_type & PR_RE_DISCONNECTED)) {
+ if (co_data(rep) || do_l7_retry(s, s->scb) == 0) {
+ DBG_TRACE_DEVEL("leaving on L7 retry",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+ }
+ }
+
+ if (txn->flags & TX_NOT_FIRST)
+ goto abort_keep_alive;
+
+ _HA_ATOMIC_INC(&s->be->be_counters.failed_resp);
+ if (objt_server(s->target)) {
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_resp);
+ health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_BROKEN_PIPE);
+ }
+
+ txn->status = 502;
+ stream_inc_http_fail_ctr(s);
+ s->scb->flags |= SC_FL_NOLINGER;
+ http_reply_and_close(s, txn->status, http_error_message(s));
+
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_SRVCL;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_H;
+ DBG_TRACE_DEVEL("leaving on error",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 0;
+ }
+
+ /* 5: write error to client (we don't send any message then) */
+ else if (rep->flags & CF_WRITE_ERROR) {
+ if (txn->flags & TX_NOT_FIRST)
+ goto abort_keep_alive;
+
+ _HA_ATOMIC_INC(&s->be->be_counters.failed_resp);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_resp);
+ rep->analysers &= AN_RES_FLT_END;
+
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_CLICL;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_H;
+
+ /* process_stream() will take care of the error */
+ DBG_TRACE_DEVEL("leaving on error",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 0;
+ }
+
+ channel_dont_close(rep);
+ rep->flags |= CF_READ_DONTWAIT; /* try to get back here ASAP */
+ DBG_TRACE_DEVEL("waiting for more data",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+ }
+
+ /* More interesting part now : we know that we have a complete
+ * response which at least looks like HTTP. We have an indicator
+ * of each header's length, so we can parse them quickly.
+ */
+ BUG_ON(htx_get_first_type(htx) != HTX_BLK_RES_SL);
+ sl = http_get_stline(htx);
+
+ /* Perform a L7 retry because of the status code */
+ if ((txn->flags & TX_L7_RETRY) &&
+ l7_status_match(s->be, sl->info.res.status) &&
+ do_l7_retry(s, s->scb) == 0) {
+ DBG_TRACE_DEVEL("leaving on L7 retry", STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+ }
+
+ /* Now, L7 buffer is useless, it can be released */
+ b_free(&txn->l7_buffer);
+
+ msg->msg_state = HTTP_MSG_BODY;
+
+
+ /* 0: we might have to print this header in debug mode */
+ if (unlikely((global.mode & MODE_DEBUG) &&
+ (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)))) {
+ int32_t pos;
+
+ http_debug_stline("srvrep", s, sl);
+
+ for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
+ struct htx_blk *blk = htx_get_blk(htx, pos);
+ enum htx_blk_type type = htx_get_blk_type(blk);
+
+ if (type == HTX_BLK_EOH)
+ break;
+ if (type != HTX_BLK_HDR)
+ continue;
+
+ http_debug_hdr("srvhdr", s,
+ htx_get_blk_name(htx, blk),
+ htx_get_blk_value(htx, blk));
+ }
+ }
+
+ /* 1: get the status code and the version. Also set HTTP flags */
+ txn->status = sl->info.res.status;
+ if (sl->flags & HTX_SL_F_VER_11)
+ msg->flags |= HTTP_MSGF_VER_11;
+ if (sl->flags & HTX_SL_F_XFER_LEN) {
+ msg->flags |= HTTP_MSGF_XFER_LEN;
+ if (sl->flags & HTX_SL_F_CLEN)
+ msg->flags |= HTTP_MSGF_CNT_LEN;
+ else if (sl->flags & HTX_SL_F_CHNK)
+ msg->flags |= HTTP_MSGF_TE_CHNK;
+ }
+ if (sl->flags & HTX_SL_F_BODYLESS)
+ msg->flags |= HTTP_MSGF_BODYLESS;
+ if (sl->flags & HTX_SL_F_CONN_UPG)
+ msg->flags |= HTTP_MSGF_CONN_UPG;
+
+ n = txn->status / 100;
+ if (n < 1 || n > 5)
+ n = 0;
+
+ /* when the client triggers a 4xx from the server, it's most often due
+ * to a missing object or permission. These events should be tracked
+ * because if they happen often, it may indicate a brute force or a
+ * vulnerability scan.
+ */
+ if (n == 4)
+ stream_inc_http_err_ctr(s);
+
+ if (n == 5 && txn->status != 501 && txn->status != 505)
+ stream_inc_http_fail_ctr(s);
+
+ if (objt_server(s->target)) {
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.p.http.rsp[n]);
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.p.http.cum_req);
+ }
+
+ /* Adjust server's health based on status code. Note: status codes 501
+ * and 505 are triggered on demand by client request, so we must not
+ * count them as server failures.
+ */
+ if (objt_server(s->target)) {
+ if (txn->status >= 100 && (txn->status < 500 || txn->status == 501 || txn->status == 505))
+ health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_OK);
+ else
+ health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_STS);
+ }
+
+ /*
+ * We may be facing a 100-continue response, or any other informational
+ * 1xx response which is non-final, in which case this is not the right
+ * response, and we're waiting for the next one. Let's allow this response
+ * to go to the client and wait for the next one. There's an exception for
+ * 101 which is used later in the code to switch protocols.
+ */
+ if (txn->status < 200 &&
+ (txn->status == 100 || txn->status >= 102)) {
+ FLT_STRM_CB(s, flt_http_reset(s, msg));
+ htx->first = channel_htx_fwd_headers(rep, htx);
+ msg->msg_state = HTTP_MSG_RPBEFORE;
+ msg->flags = 0;
+ txn->status = 0;
+ s->logs.t_data = -1; /* was not a response yet */
+ rep->flags |= CF_SEND_DONTWAIT; /* Send ASAP informational messages */
+ goto next_one;
+ }
+
+ /* A 101-switching-protocols must contains a Connection header with the
+ * "upgrade" option and the request too. It means both are agree to
+ * upgrade. It is not so strict because there is no test on the Upgrade
+ * header content. But it is probably stronger enough for now.
+ */
+ if (txn->status == 101 &&
+ (!(txn->req.flags & HTTP_MSGF_CONN_UPG) || !(txn->rsp.flags & HTTP_MSGF_CONN_UPG)))
+ goto return_bad_res;
+
+ /*
+ * 2: check for cacheability.
+ */
+
+ switch (txn->status) {
+ case 200:
+ case 203:
+ case 204:
+ case 206:
+ case 300:
+ case 301:
+ case 404:
+ case 405:
+ case 410:
+ case 414:
+ case 501:
+ break;
+ default:
+ /* RFC7231#6.1:
+ * Responses with status codes that are defined as
+ * cacheable by default (e.g., 200, 203, 204, 206,
+ * 300, 301, 404, 405, 410, 414, and 501 in this
+ * specification) can be reused by a cache with
+ * heuristic expiration unless otherwise indicated
+ * by the method definition or explicit cache
+ * controls [RFC7234]; all other status codes are
+ * not cacheable by default.
+ */
+ txn->flags &= ~(TX_CACHEABLE | TX_CACHE_COOK);
+ break;
+ }
+
+ /*
+ * 3: we may need to capture headers
+ */
+ s->logs.logwait &= ~LW_RESP;
+ if (unlikely((s->logs.logwait & LW_RSPHDR) && s->res_cap))
+ http_capture_headers(htx, s->res_cap, sess->fe->rsp_cap);
+
+ /* Skip parsing if no content length is possible. */
+ if (unlikely((txn->meth == HTTP_METH_CONNECT && txn->status >= 200 && txn->status < 300) ||
+ txn->status == 101)) {
+ /* Either we've established an explicit tunnel, or we're
+ * switching the protocol. In both cases, we're very unlikely
+ * to understand the next protocols. We have to switch to tunnel
+ * mode, so that we transfer the request and responses then let
+ * this protocol pass unmodified. When we later implement specific
+ * parsers for such protocols, we'll want to check the Upgrade
+ * header which contains information about that protocol for
+ * responses with status 101 (eg: see RFC2817 about TLS).
+ */
+ txn->flags |= TX_CON_WANT_TUN;
+ }
+
+ /* check for NTML authentication headers in 401 (WWW-Authenticate) and
+ * 407 (Proxy-Authenticate) responses and set the connection to private
+ */
+ srv_conn = sc_conn(s->scb);
+ if (srv_conn) {
+ struct ist hdr;
+ struct http_hdr_ctx ctx;
+
+ if (txn->status == 401)
+ hdr = ist("WWW-Authenticate");
+ else if (txn->status == 407)
+ hdr = ist("Proxy-Authenticate");
+ else
+ goto end;
+
+ ctx.blk = NULL;
+ while (http_find_header(htx, hdr, &ctx, 0)) {
+ /* If www-authenticate contains "Negotiate", "Nego2", or "NTLM",
+ * possibly followed by blanks and a base64 string, the connection
+ * is private. Since it's a mess to deal with, we only check for
+ * values starting with "NTLM" or "Nego". Note that often multiple
+ * headers are sent by the server there.
+ */
+ if ((ctx.value.len >= 4 && strncasecmp(ctx.value.ptr, "Nego", 4) == 0) ||
+ (ctx.value.len >= 4 && strncasecmp(ctx.value.ptr, "NTLM", 4) == 0)) {
+ sess->flags |= SESS_FL_PREFER_LAST;
+ conn_set_owner(srv_conn, sess, NULL);
+ conn_set_private(srv_conn);
+ /* If it fail now, the same will be done in mux->detach() callback */
+ session_add_conn(srv_conn->owner, srv_conn, srv_conn->target);
+ break;
+ }
+ }
+ }
+
+ end:
+ /* we want to have the response time before we start processing it */
+ s->logs.t_data = tv_ms_elapsed(&s->logs.tv_accept, &now);
+
+ /* end of job, return OK */
+ rep->analysers &= ~an_bit;
+ rep->analyse_exp = TICK_ETERNITY;
+ channel_auto_close(rep);
+ DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 1;
+
+ return_int_err:
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.internal_errors);
+ _HA_ATOMIC_INC(&s->be->be_counters.internal_errors);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->internal_errors);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.internal_errors);
+ txn->status = 500;
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_INTERNAL;
+ goto return_prx_cond;
+
+ return_bad_res:
+ _HA_ATOMIC_INC(&s->be->be_counters.failed_resp);
+ if (objt_server(s->target)) {
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_resp);
+ health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_HDRRSP);
+ }
+ if ((s->be->retry_type & PR_RE_JUNK_REQUEST) &&
+ (txn->flags & TX_L7_RETRY) &&
+ do_l7_retry(s, s->scb) == 0) {
+ DBG_TRACE_DEVEL("leaving on L7 retry",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+ }
+ txn->status = 502;
+ stream_inc_http_fail_ctr(s);
+ /* fall through */
+
+ return_prx_cond:
+ http_reply_and_close(s, txn->status, http_error_message(s));
+
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_PRXCOND;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_H;
+
+ s->scb->flags |= SC_FL_NOLINGER;
+ DBG_TRACE_DEVEL("leaving on error",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 0;
+
+ abort_keep_alive:
+ /* A keep-alive request to the server failed on a network error.
+ * The client is required to retry. We need to close without returning
+ * any other information so that the client retries.
+ */
+ txn->status = 0;
+ s->logs.logwait = 0;
+ s->logs.level = 0;
+ s->res.flags &= ~CF_EXPECT_MORE; /* speed up sending a previous response */
+ http_reply_and_close(s, txn->status, NULL);
+ DBG_TRACE_DEVEL("leaving by closing K/A connection",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+}
+
+/* This function performs all the processing enabled for the current response.
+ * It normally returns 1 unless it wants to break. It relies on buffers flags,
+ * and updates s->res.analysers. It might make sense to explode it into several
+ * other functions. It works like process_request (see indications above).
+ */
+int http_process_res_common(struct stream *s, struct channel *rep, int an_bit, struct proxy *px)
+{
+ struct session *sess = s->sess;
+ struct http_txn *txn = s->txn;
+ struct http_msg *msg = &txn->rsp;
+ struct htx *htx;
+ struct proxy *cur_proxy;
+ enum rule_result ret = HTTP_RULE_RES_CONT;
+
+ if (unlikely(msg->msg_state < HTTP_MSG_BODY)) /* we need more data */
+ return 0;
+
+ DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, msg);
+
+ htx = htxbuf(&rep->buf);
+
+ /* The stats applet needs to adjust the Connection header but we don't
+ * apply any filter there.
+ */
+ if (unlikely(objt_applet(s->target) == &http_stats_applet)) {
+ rep->analysers &= ~an_bit;
+ rep->analyse_exp = TICK_ETERNITY;
+ goto end;
+ }
+
+ /*
+ * We will have to evaluate the filters.
+ * As opposed to version 1.2, now they will be evaluated in the
+ * filters order and not in the header order. This means that
+ * each filter has to be validated among all headers.
+ *
+ * Filters are tried with ->be first, then with ->fe if it is
+ * different from ->be.
+ *
+ * Maybe we are in resume condiion. In this case I choose the
+ * "struct proxy" which contains the rule list matching the resume
+ * pointer. If none of these "struct proxy" match, I initialise
+ * the process with the first one.
+ *
+ * In fact, I check only correspondence between the current list
+ * pointer and the ->fe rule list. If it doesn't match, I initialize
+ * the loop with the ->be.
+ */
+ if (s->current_rule_list == &sess->fe->http_res_rules ||
+ (sess->fe->defpx && s->current_rule_list == &sess->fe->defpx->http_res_rules))
+ cur_proxy = sess->fe;
+ else
+ cur_proxy = s->be;
+
+ while (1) {
+ /* evaluate http-response rules */
+ if (ret == HTTP_RULE_RES_CONT || ret == HTTP_RULE_RES_STOP) {
+ struct list *def_rules, *rules;
+
+ def_rules = ((cur_proxy->defpx && (cur_proxy == s->be || cur_proxy->defpx != s->be->defpx)) ? &cur_proxy->defpx->http_res_rules : NULL);
+ rules = &cur_proxy->http_res_rules;
+
+ ret = http_res_get_intercept_rule(cur_proxy, def_rules, rules, s);
+
+ switch (ret) {
+ case HTTP_RULE_RES_YIELD: /* some data miss, call the function later. */
+ goto return_prx_yield;
+
+ case HTTP_RULE_RES_CONT:
+ case HTTP_RULE_RES_STOP: /* nothing to do */
+ break;
+
+ case HTTP_RULE_RES_DENY: /* deny or tarpit */
+ goto deny;
+
+ case HTTP_RULE_RES_ABRT: /* abort request, response already sent */
+ goto return_prx_cond;
+
+ case HTTP_RULE_RES_DONE: /* OK, but terminate request processing (eg: redirect) */
+ goto done;
+
+ case HTTP_RULE_RES_BADREQ: /* failed with a bad request */
+ goto return_bad_res;
+
+ case HTTP_RULE_RES_ERROR: /* failed with a bad request */
+ goto return_int_err;
+ }
+
+ }
+
+ /* check whether we're already working on the frontend */
+ if (cur_proxy == sess->fe)
+ break;
+ cur_proxy = sess->fe;
+ }
+
+ /* OK that's all we can do for 1xx responses */
+ if (unlikely(txn->status < 200 && txn->status != 101))
+ goto end;
+
+ /*
+ * Now check for a server cookie.
+ */
+ if (s->be->cookie_name || sess->fe->capture_name || (s->be->options & PR_O_CHK_CACHE))
+ http_manage_server_side_cookies(s, rep);
+
+ /*
+ * Check for cache-control or pragma headers if required.
+ */
+ if ((s->be->options & PR_O_CHK_CACHE) || (s->be->ck_opts & PR_CK_NOC))
+ http_check_response_for_cacheability(s, rep);
+
+ /*
+ * Add server cookie in the response if needed
+ */
+ if (objt_server(s->target) && (s->be->ck_opts & PR_CK_INS) &&
+ !((txn->flags & TX_SCK_FOUND) && (s->be->ck_opts & PR_CK_PSV)) &&
+ (!(s->flags & SF_DIRECT) ||
+ ((s->be->cookie_maxidle || txn->cookie_last_date) &&
+ (!txn->cookie_last_date || (txn->cookie_last_date - date.tv_sec) < 0)) ||
+ (s->be->cookie_maxlife && !txn->cookie_first_date) || // set the first_date
+ (!s->be->cookie_maxlife && txn->cookie_first_date)) && // remove the first_date
+ (!(s->be->ck_opts & PR_CK_POST) || (txn->meth == HTTP_METH_POST)) &&
+ !(s->flags & SF_IGNORE_PRST)) {
+ /* the server is known, it's not the one the client requested, or the
+ * cookie's last seen date needs to be refreshed. We have to
+ * insert a set-cookie here, except if we want to insert only on POST
+ * requests and this one isn't. Note that servers which don't have cookies
+ * (eg: some backup servers) will return a full cookie removal request.
+ */
+ if (!__objt_server(s->target)->cookie) {
+ chunk_printf(&trash,
+ "%s=; Expires=Thu, 01-Jan-1970 00:00:01 GMT; path=/",
+ s->be->cookie_name);
+ }
+ else {
+ chunk_printf(&trash, "%s=%s", s->be->cookie_name, __objt_server(s->target)->cookie);
+
+ if (s->be->cookie_maxidle || s->be->cookie_maxlife) {
+ /* emit last_date, which is mandatory */
+ trash.area[trash.data++] = COOKIE_DELIM_DATE;
+ s30tob64((date.tv_sec+3) >> 2,
+ trash.area + trash.data);
+ trash.data += 5;
+
+ if (s->be->cookie_maxlife) {
+ /* emit first_date, which is either the original one or
+ * the current date.
+ */
+ trash.area[trash.data++] = COOKIE_DELIM_DATE;
+ s30tob64(txn->cookie_first_date ?
+ txn->cookie_first_date >> 2 :
+ (date.tv_sec+3) >> 2,
+ trash.area + trash.data);
+ trash.data += 5;
+ }
+ }
+ chunk_appendf(&trash, "; path=/");
+ }
+
+ if (s->be->cookie_domain)
+ chunk_appendf(&trash, "; domain=%s", s->be->cookie_domain);
+
+ if (s->be->ck_opts & PR_CK_HTTPONLY)
+ chunk_appendf(&trash, "; HttpOnly");
+
+ if (s->be->ck_opts & PR_CK_SECURE)
+ chunk_appendf(&trash, "; Secure");
+
+ if (s->be->cookie_attrs)
+ chunk_appendf(&trash, "; %s", s->be->cookie_attrs);
+
+ if (unlikely(!http_add_header(htx, ist("Set-Cookie"), ist2(trash.area, trash.data))))
+ goto return_fail_rewrite;
+
+ txn->flags &= ~TX_SCK_MASK;
+ if (__objt_server(s->target)->cookie && (s->flags & SF_DIRECT))
+ /* the server did not change, only the date was updated */
+ txn->flags |= TX_SCK_UPDATED;
+ else
+ txn->flags |= TX_SCK_INSERTED;
+
+ /* Here, we will tell an eventual cache on the client side that we don't
+ * want it to cache this reply because HTTP/1.0 caches also cache cookies !
+ * Some caches understand the correct form: 'no-cache="set-cookie"', but
+ * others don't (eg: apache <= 1.3.26). So we use 'private' instead.
+ */
+ if ((s->be->ck_opts & PR_CK_NOC) && (txn->flags & TX_CACHEABLE)) {
+
+ txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;
+
+ if (unlikely(!http_add_header(htx, ist("Cache-control"), ist("private"))))
+ goto return_fail_rewrite;
+ }
+ }
+
+ /*
+ * Check if result will be cacheable with a cookie.
+ * We'll block the response if security checks have caught
+ * nasty things such as a cacheable cookie.
+ */
+ if (((txn->flags & (TX_CACHEABLE | TX_CACHE_COOK | TX_SCK_PRESENT)) ==
+ (TX_CACHEABLE | TX_CACHE_COOK | TX_SCK_PRESENT)) &&
+ (s->be->options & PR_O_CHK_CACHE)) {
+ /* we're in presence of a cacheable response containing
+ * a set-cookie header. We'll block it as requested by
+ * the 'checkcache' option, and send an alert.
+ */
+ ha_alert("Blocking cacheable cookie in response from instance %s, server %s.\n",
+ s->be->id, objt_server(s->target) ? __objt_server(s->target)->id : "<dispatch>");
+ send_log(s->be, LOG_ALERT,
+ "Blocking cacheable cookie in response from instance %s, server %s.\n",
+ s->be->id, objt_server(s->target) ? __objt_server(s->target)->id : "<dispatch>");
+ goto deny;
+ }
+
+ end:
+ /*
+ * Evaluate after-response rules before forwarding the response. rules
+ * from the backend are evaluated first, then one from the frontend if
+ * it differs.
+ */
+ if (!http_eval_after_res_rules(s))
+ goto return_int_err;
+
+ /* Filter the response headers if there are filters attached to the
+ * stream.
+ */
+ if (HAS_FILTERS(s))
+ rep->analysers |= AN_RES_FLT_HTTP_HDRS;
+
+ /* Always enter in the body analyzer */
+ rep->analysers &= ~AN_RES_FLT_XFER_DATA;
+ rep->analysers |= AN_RES_HTTP_XFER_BODY;
+
+ /* if the user wants to log as soon as possible, without counting
+ * bytes from the server, then this is the right moment. We have
+ * to temporarily assign bytes_out to log what we currently have.
+ */
+ if (!LIST_ISEMPTY(&sess->fe->logformat) && !(s->logs.logwait & LW_BYTES)) {
+ s->logs.t_close = s->logs.t_data; /* to get a valid end date */
+ s->logs.bytes_out = htx->data;
+ s->do_log(s);
+ s->logs.bytes_out = 0;
+ }
+
+ done:
+ DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ rep->analysers &= ~an_bit;
+ rep->analyse_exp = TICK_ETERNITY;
+ s->current_rule = s->current_rule_list = NULL;
+ return 1;
+
+ deny:
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.denied_resp);
+ _HA_ATOMIC_INC(&s->be->be_counters.denied_resp);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->denied_resp);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.denied_resp);
+ goto return_prx_err;
+
+ return_fail_rewrite:
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_PRXCOND;
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.failed_rewrites);
+ _HA_ATOMIC_INC(&s->be->be_counters.failed_rewrites);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->failed_rewrites);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_rewrites);
+ /* fall through */
+
+ return_int_err:
+ txn->status = 500;
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_INTERNAL;
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.internal_errors);
+ _HA_ATOMIC_INC(&s->be->be_counters.internal_errors);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->internal_errors);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.internal_errors);
+ goto return_prx_err;
+
+ return_bad_res:
+ txn->status = 502;
+ stream_inc_http_fail_ctr(s);
+ _HA_ATOMIC_INC(&s->be->be_counters.failed_resp);
+ if (objt_server(s->target)) {
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_resp);
+ health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_RSP);
+ }
+ /* fall through */
+
+ return_prx_err:
+ http_reply_and_close(s, txn->status, http_error_message(s));
+ /* fall through */
+
+ return_prx_cond:
+ s->logs.t_data = -1; /* was not a valid response */
+ s->scb->flags |= SC_FL_NOLINGER;
+
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_PRXCOND;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_H;
+
+ rep->analysers &= AN_RES_FLT_END;
+ s->req.analysers &= AN_REQ_FLT_END;
+ rep->analyse_exp = TICK_ETERNITY;
+ s->current_rule = s->current_rule_list = NULL;
+ DBG_TRACE_DEVEL("leaving on error",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 0;
+
+ return_prx_yield:
+ channel_dont_close(rep);
+ DBG_TRACE_DEVEL("waiting for more data",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+}
+
+/* This function is an analyser which forwards response body (including chunk
+ * sizes if any). It is called as soon as we must forward, even if we forward
+ * zero byte. The only situation where it must not be called is when we're in
+ * tunnel mode and we want to forward till the close. It's used both to forward
+ * remaining data and to resync after end of body. It expects the msg_state to
+ * be between MSG_BODY and MSG_DONE (inclusive). It returns zero if it needs to
+ * read more data, or 1 once we can go on with next request or end the stream.
+ *
+ * It is capable of compressing response data both in content-length mode and
+ * in chunked mode. The state machines follows different flows depending on
+ * whether content-length and chunked modes are used, since there are no
+ * trailers in content-length :
+ *
+ * chk-mode cl-mode
+ * ,----- BODY -----.
+ * / \
+ * V size > 0 V chk-mode
+ * .--> SIZE -------------> DATA -------------> CRLF
+ * | | size == 0 | last byte |
+ * | v final crlf v inspected |
+ * | TRAILERS -----------> DONE |
+ * | |
+ * `----------------------------------------------'
+ *
+ * Compression only happens in the DATA state, and must be flushed in final
+ * states (TRAILERS/DONE) or when leaving on missing data. Normal forwarding
+ * is performed at once on final states for all bytes parsed, or when leaving
+ * on missing data.
+ */
+int http_response_forward_body(struct stream *s, struct channel *res, int an_bit)
+{
+ struct session *sess = s->sess;
+ struct http_txn *txn = s->txn;
+ struct http_msg *msg = &s->txn->rsp;
+ struct htx *htx;
+ int ret;
+
+ DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, msg);
+
+ htx = htxbuf(&res->buf);
+
+ if (htx->flags & HTX_FL_PARSING_ERROR)
+ goto return_bad_res;
+ if (htx->flags & HTX_FL_PROCESSING_ERROR)
+ goto return_int_err;
+
+ if ((res->flags & (CF_READ_ERROR|CF_READ_TIMEOUT|CF_WRITE_ERROR|CF_WRITE_TIMEOUT)) ||
+ ((res->flags & CF_SHUTW) && (res->to_forward || co_data(res)))) {
+ /* Output closed while we were sending data. We must abort and
+ * wake the other side up.
+ */
+ msg->msg_state = HTTP_MSG_ERROR;
+ http_end_response(s);
+ http_end_request(s);
+ DBG_TRACE_DEVEL("leaving on error",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 1;
+ }
+
+ if (msg->msg_state == HTTP_MSG_BODY)
+ msg->msg_state = HTTP_MSG_DATA;
+
+ /* in most states, we should abort in case of early close */
+ channel_auto_close(res);
+
+ if (res->to_forward) {
+ if (res->to_forward == CHN_INFINITE_FORWARD) {
+ if (res->flags & CF_EOI)
+ msg->msg_state = HTTP_MSG_ENDING;
+ }
+ else {
+ /* We can't process the buffer's contents yet */
+ res->flags |= CF_WAKE_WRITE;
+ goto missing_data_or_waiting;
+ }
+ }
+
+ if (msg->msg_state >= HTTP_MSG_ENDING)
+ goto ending;
+
+ if ((txn->meth == HTTP_METH_CONNECT && txn->status >= 200 && txn->status < 300) || txn->status == 101 ||
+ (!(msg->flags & HTTP_MSGF_XFER_LEN) && !HAS_RSP_DATA_FILTERS(s))) {
+ msg->msg_state = HTTP_MSG_ENDING;
+ goto ending;
+ }
+
+ /* Forward input data. We get it by removing all outgoing data not
+ * forwarded yet from HTX data size. If there are some data filters, we
+ * let them decide the amount of data to forward.
+ */
+ if (HAS_RSP_DATA_FILTERS(s)) {
+ ret = flt_http_payload(s, msg, htx->data);
+ if (ret < 0)
+ goto return_bad_res;
+ c_adv(res, ret);
+ }
+ else {
+ c_adv(res, htx->data - co_data(res));
+ if (msg->flags & HTTP_MSGF_XFER_LEN)
+ channel_htx_forward_forever(res, htx);
+ }
+
+ if (htx->data != co_data(res))
+ goto missing_data_or_waiting;
+
+ if (!(msg->flags & HTTP_MSGF_XFER_LEN) && res->flags & CF_SHUTR) {
+ msg->msg_state = HTTP_MSG_ENDING;
+ goto ending;
+ }
+
+ /* Check if the end-of-message is reached and if so, switch the message
+ * in HTTP_MSG_ENDING state. Then if all data was marked to be
+ * forwarded, set the state to HTTP_MSG_DONE.
+ */
+ if (!(htx->flags & HTX_FL_EOM))
+ goto missing_data_or_waiting;
+
+ msg->msg_state = HTTP_MSG_ENDING;
+
+ ending:
+ res->flags &= ~CF_EXPECT_MORE; /* no more data are expected */
+
+ /* other states, ENDING...TUNNEL */
+ if (msg->msg_state >= HTTP_MSG_DONE)
+ goto done;
+
+ if (HAS_RSP_DATA_FILTERS(s)) {
+ ret = flt_http_end(s, msg);
+ if (ret <= 0) {
+ if (!ret)
+ goto missing_data_or_waiting;
+ goto return_bad_res;
+ }
+ }
+
+ if ((txn->meth == HTTP_METH_CONNECT && txn->status >= 200 && txn->status < 300) || txn->status == 101 ||
+ !(msg->flags & HTTP_MSGF_XFER_LEN)) {
+ msg->msg_state = HTTP_MSG_TUNNEL;
+ goto ending;
+ }
+ else {
+ msg->msg_state = HTTP_MSG_DONE;
+ res->to_forward = 0;
+ }
+
+ done:
+
+ channel_dont_close(res);
+
+ http_end_response(s);
+ if (!(res->analysers & an_bit)) {
+ http_end_request(s);
+ if (unlikely(msg->msg_state == HTTP_MSG_ERROR)) {
+ if (res->flags & CF_SHUTW) {
+ /* response errors are most likely due to the
+ * client aborting the transfer. */
+ goto return_cli_abort;
+ }
+ goto return_bad_res;
+ }
+ DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 1;
+ }
+ DBG_TRACE_DEVEL("waiting for the end of the HTTP txn",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+
+ missing_data_or_waiting:
+ if (res->flags & CF_SHUTW)
+ goto return_cli_abort;
+
+ /* stop waiting for data if the input is closed before the end. If the
+ * client side was already closed, it means that the client has aborted,
+ * so we don't want to count this as a server abort. Otherwise it's a
+ * server abort.
+ */
+ if (msg->msg_state < HTTP_MSG_ENDING && res->flags & CF_SHUTR) {
+ if ((s->req.flags & (CF_SHUTR|CF_SHUTW)) == (CF_SHUTR|CF_SHUTW))
+ goto return_cli_abort;
+ /* If we have some pending data, we continue the processing */
+ if (htx_is_empty(htx))
+ goto return_srv_abort;
+ }
+
+ /* When TE: chunked is used, we need to get there again to parse
+ * remaining chunks even if the server has closed, so we don't want to
+ * set CF_DONTCLOSE. Similarly when there is a content-leng or if there
+ * are filters registered on the stream, we don't want to forward a
+ * close
+ */
+ if ((msg->flags & HTTP_MSGF_XFER_LEN) || HAS_RSP_DATA_FILTERS(s))
+ channel_dont_close(res);
+
+ /* We know that more data are expected, but we couldn't send more that
+ * what we did. So we always set the CF_EXPECT_MORE flag so that the
+ * system knows it must not set a PUSH on this first part. Interactive
+ * modes are already handled by the stream sock layer. We must not do
+ * this in content-length mode because it could present the MSG_MORE
+ * flag with the last block of forwarded data, which would cause an
+ * additional delay to be observed by the receiver.
+ */
+ if (HAS_RSP_DATA_FILTERS(s))
+ res->flags |= CF_EXPECT_MORE;
+
+ /* the stream handler will take care of timeouts and errors */
+ DBG_TRACE_DEVEL("waiting for more data to forward",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
+ return 0;
+
+ return_srv_abort:
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.srv_aborts);
+ _HA_ATOMIC_INC(&s->be->be_counters.srv_aborts);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->srv_aborts);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.srv_aborts);
+ stream_inc_http_fail_ctr(s);
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_SRVCL;
+ goto return_error;
+
+ return_cli_abort:
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.cli_aborts);
+ _HA_ATOMIC_INC(&s->be->be_counters.cli_aborts);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->cli_aborts);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.cli_aborts);
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_CLICL;
+ goto return_error;
+
+ return_int_err:
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.internal_errors);
+ _HA_ATOMIC_INC(&s->be->be_counters.internal_errors);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->internal_errors);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.internal_errors);
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_INTERNAL;
+ goto return_error;
+
+ return_bad_res:
+ _HA_ATOMIC_INC(&s->be->be_counters.failed_resp);
+ if (objt_server(s->target)) {
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_resp);
+ health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_RSP);
+ }
+ stream_inc_http_fail_ctr(s);
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_SRVCL;
+ /* fall through */
+
+ return_error:
+ /* don't send any error message as we're in the body */
+ http_reply_and_close(s, txn->status, NULL);
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_D;
+ DBG_TRACE_DEVEL("leaving on error",
+ STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
+ return 0;
+}
+
+/* Perform an HTTP redirect based on the information in <rule>. The function
+ * returns zero in case of an irrecoverable error such as too large a request
+ * to build a valid response, 1 in case of successful redirect (hence the rule
+ * is final), or 2 if the rule has to be silently skipped.
+ */
+int http_apply_redirect_rule(struct redirect_rule *rule, struct stream *s, struct http_txn *txn)
+{
+ struct channel *req = &s->req;
+ struct channel *res = &s->res;
+ struct htx *htx;
+ struct htx_sl *sl;
+ struct buffer *chunk;
+ struct ist status, reason, location;
+ unsigned int flags;
+ int ret = 1, close = 0; /* Try to keep the connection alive byt default */
+
+ chunk = alloc_trash_chunk();
+ if (!chunk) {
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_RESOURCE;
+ goto fail;
+ }
+
+ /*
+ * Create the location
+ */
+ htx = htxbuf(&req->buf);
+ switch(rule->type) {
+ case REDIRECT_TYPE_SCHEME: {
+ struct http_hdr_ctx ctx;
+ struct ist path, host;
+ struct http_uri_parser parser;
+
+ host = ist("");
+ ctx.blk = NULL;
+ if (http_find_header(htx, ist("Host"), &ctx, 0))
+ host = ctx.value;
+
+ sl = http_get_stline(htx);
+ parser = http_uri_parser_init(htx_sl_req_uri(sl));
+ path = http_parse_path(&parser);
+ /* build message using path */
+ if (isttest(path)) {
+ if (rule->flags & REDIRECT_FLAG_DROP_QS) {
+ int qs = 0;
+ while (qs < path.len) {
+ if (*(path.ptr + qs) == '?') {
+ path.len = qs;
+ break;
+ }
+ qs++;
+ }
+ }
+ }
+ else
+ path = ist("/");
+
+ if (rule->rdr_str) { /* this is an old "redirect" rule */
+ /* add scheme */
+ if (!chunk_memcat(chunk, rule->rdr_str, rule->rdr_len))
+ goto fail;
+ }
+ else {
+ /* add scheme with executing log format */
+ chunk->data += build_logline(s, chunk->area + chunk->data,
+ chunk->size - chunk->data,
+ &rule->rdr_fmt);
+ }
+ /* add "://" + host + path */
+ if (!chunk_memcat(chunk, "://", 3) ||
+ !chunk_memcat(chunk, host.ptr, host.len) ||
+ !chunk_memcat(chunk, path.ptr, path.len))
+ goto fail;
+
+ /* append a slash at the end of the location if needed and missing */
+ if (chunk->data && chunk->area[chunk->data - 1] != '/' &&
+ (rule->flags & REDIRECT_FLAG_APPEND_SLASH)) {
+ if (chunk->data + 1 >= chunk->size)
+ goto fail;
+ chunk->area[chunk->data++] = '/';
+ }
+ break;
+ }
+
+ case REDIRECT_TYPE_PREFIX: {
+ struct ist path;
+ struct http_uri_parser parser;
+
+ sl = http_get_stline(htx);
+ parser = http_uri_parser_init(htx_sl_req_uri(sl));
+ path = http_parse_path(&parser);
+ /* build message using path */
+ if (isttest(path)) {
+ if (rule->flags & REDIRECT_FLAG_DROP_QS) {
+ int qs = 0;
+ while (qs < path.len) {
+ if (*(path.ptr + qs) == '?') {
+ path.len = qs;
+ break;
+ }
+ qs++;
+ }
+ }
+ }
+ else
+ path = ist("/");
+
+ if (rule->rdr_str) { /* this is an old "redirect" rule */
+ /* add prefix. Note that if prefix == "/", we don't want to
+ * add anything, otherwise it makes it hard for the user to
+ * configure a self-redirection.
+ */
+ if (rule->rdr_len != 1 || *rule->rdr_str != '/') {
+ if (!chunk_memcat(chunk, rule->rdr_str, rule->rdr_len))
+ goto fail;
+ }
+ }
+ else {
+ /* add prefix with executing log format */
+ chunk->data += build_logline(s, chunk->area + chunk->data,
+ chunk->size - chunk->data,
+ &rule->rdr_fmt);
+ }
+
+ /* add path */
+ if (!chunk_memcat(chunk, path.ptr, path.len))
+ goto fail;
+
+ /* append a slash at the end of the location if needed and missing */
+ if (chunk->data && chunk->area[chunk->data - 1] != '/' &&
+ (rule->flags & REDIRECT_FLAG_APPEND_SLASH)) {
+ if (chunk->data + 1 >= chunk->size)
+ goto fail;
+ chunk->area[chunk->data++] = '/';
+ }
+ break;
+ }
+ case REDIRECT_TYPE_LOCATION:
+ default:
+ if (rule->rdr_str) { /* this is an old "redirect" rule */
+ /* add location */
+ if (!chunk_memcat(chunk, rule->rdr_str, rule->rdr_len))
+ goto fail;
+ }
+ else {
+ /* add location with executing log format */
+ int len = build_logline(s, chunk->area + chunk->data,
+ chunk->size - chunk->data,
+ &rule->rdr_fmt);
+ if (!len && rule->flags & REDIRECT_FLAG_IGNORE_EMPTY) {
+ ret = 2;
+ goto out;
+ }
+
+ chunk->data += len;
+ }
+ break;
+ }
+ location = ist2(chunk->area, chunk->data);
+
+ /*
+ * Create the 30x response
+ */
+ switch (rule->code) {
+ case 308:
+ status = ist("308");
+ reason = ist("Permanent Redirect");
+ break;
+ case 307:
+ status = ist("307");
+ reason = ist("Temporary Redirect");
+ break;
+ case 303:
+ status = ist("303");
+ reason = ist("See Other");
+ break;
+ case 301:
+ status = ist("301");
+ reason = ist("Moved Permanently");
+ break;
+ case 302:
+ default:
+ status = ist("302");
+ reason = ist("Found");
+ break;
+ }
+
+ if (!(txn->req.flags & HTTP_MSGF_BODYLESS) && txn->req.msg_state != HTTP_MSG_DONE)
+ close = 1;
+
+ htx = htx_from_buf(&res->buf);
+ /* Trim any possible response */
+ channel_htx_truncate(&s->res, htx);
+ flags = (HTX_SL_F_IS_RESP|HTX_SL_F_VER_11|HTX_SL_F_XFER_LEN|HTX_SL_F_BODYLESS);
+ sl = htx_add_stline(htx, HTX_BLK_RES_SL, flags, ist("HTTP/1.1"), status, reason);
+ if (!sl)
+ goto fail;
+ sl->info.res.status = rule->code;
+ s->txn->status = rule->code;
+
+ if (close && !htx_add_header(htx, ist("Connection"), ist("close")))
+ goto fail;
+
+ if (!htx_add_header(htx, ist("Content-length"), ist("0")) ||
+ !htx_add_header(htx, ist("Location"), location))
+ goto fail;
+
+ if (rule->code == 302 || rule->code == 303 || rule->code == 307) {
+ if (!htx_add_header(htx, ist("Cache-Control"), ist("no-cache")))
+ goto fail;
+ }
+
+ if (rule->cookie_len) {
+ if (!htx_add_header(htx, ist("Set-Cookie"), ist2(rule->cookie_str, rule->cookie_len)))
+ goto fail;
+ }
+
+ if (!htx_add_endof(htx, HTX_BLK_EOH))
+ goto fail;
+
+ htx->flags |= HTX_FL_EOM;
+ htx_to_buf(htx, &res->buf);
+ if (!http_forward_proxy_resp(s, 1))
+ goto fail;
+
+ if (rule->flags & REDIRECT_FLAG_FROM_REQ) {
+ /* let's log the request time */
+ s->logs.tv_request = now;
+ req->analysers &= AN_REQ_FLT_END;
+
+ if (s->sess->fe == s->be) /* report it if the request was intercepted by the frontend */
+ _HA_ATOMIC_INC(&s->sess->fe->fe_counters.intercepted_req);
+ }
+
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_LOCAL;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= ((rule->flags & REDIRECT_FLAG_FROM_REQ) ? SF_FINST_R : SF_FINST_H);
+
+ out:
+ free_trash_chunk(chunk);
+ return ret;
+
+ fail:
+ /* If an error occurred, remove the incomplete HTTP response from the
+ * buffer */
+ channel_htx_truncate(res, htxbuf(&res->buf));
+ ret = 0;
+ goto out;
+}
+
+/* This function filters the request header names to only allow [0-9a-zA-Z-]
+ * characters. Depending on the proxy configuration, headers with a name not
+ * matching this charset are removed or the request is rejected with a
+ * 403-Forbidden response if such name are found. It returns HTTP_RULE_RES_CONT
+ * to continue the request processing or HTTP_RULE_RES_DENY if the request is
+ * rejected.
+ */
+static enum rule_result http_req_restrict_header_names(struct stream *s, struct htx *htx, struct proxy *px)
+{
+ struct htx_blk *blk;
+ enum rule_result rule_ret = HTTP_RULE_RES_CONT;
+
+ blk = htx_get_first_blk(htx);
+ while (blk) {
+ enum htx_blk_type type = htx_get_blk_type(blk);
+
+ if (type == HTX_BLK_HDR) {
+ struct ist n = htx_get_blk_name(htx, blk);
+ int i, end = istlen(n);
+
+ for (i = 0; i < end; i++) {
+ if (!isalnum((unsigned char)n.ptr[i]) && n.ptr[i] != '-') {
+ break;
+ }
+ }
+
+ if (i < end) {
+ /* Disallowed character found - block the request or remove the header */
+ if (px->options2 & PR_O2_RSTRICT_REQ_HDR_NAMES_BLK)
+ goto block;
+ blk = htx_remove_blk(htx, blk);
+ continue;
+ }
+ }
+ if (type == HTX_BLK_EOH)
+ break;
+
+ blk = htx_get_next_blk(htx, blk);
+ }
+ out:
+ return rule_ret;
+ block:
+ /* Block the request returning a 403-Forbidden response */
+ s->txn->status = 403;
+ rule_ret = HTTP_RULE_RES_DENY;
+ goto out;
+}
+
+/* Replace all headers matching the name <name>. The header value is replaced if
+ * it matches the regex <re>. <str> is used for the replacement. If <full> is
+ * set to 1, the full-line is matched and replaced. Otherwise, comma-separated
+ * values are evaluated one by one. It returns 0 on success and -1 on error.
+ */
+int http_replace_hdrs(struct stream* s, struct htx *htx, struct ist name,
+ const char *str, struct my_regex *re, int full)
+{
+ struct http_hdr_ctx ctx;
+ struct buffer *output = get_trash_chunk();
+
+ ctx.blk = NULL;
+ while (http_find_header(htx, name, &ctx, full)) {
+ if (!regex_exec_match2(re, ctx.value.ptr, ctx.value.len, MAX_MATCH, pmatch, 0))
+ continue;
+
+ output->data = exp_replace(output->area, output->size, ctx.value.ptr, str, pmatch);
+ if (output->data == -1)
+ return -1;
+ if (!http_replace_header_value(htx, &ctx, ist2(output->area, output->data)))
+ return -1;
+ }
+ return 0;
+}
+
+/* This function executes one of the set-{method,path,query,uri} actions. It
+ * takes the string from the variable 'replace' with length 'len', then modifies
+ * the relevant part of the request line accordingly. Then it updates various
+ * pointers to the next elements which were moved, and the total buffer length.
+ * It finds the action to be performed in p[2], previously filled by function
+ * parse_set_req_line(). It returns 0 in case of success, -1 in case of internal
+ * error, though this can be revisited when this code is finally exploited.
+ *
+ * 'action' can be '0' to replace method, '1' to replace path, '2' to replace
+ * query string, 3 to replace uri or 4 to replace the path+query.
+ *
+ * In query string case, the mark question '?' must be set at the start of the
+ * string by the caller, event if the replacement query string is empty.
+ */
+int http_req_replace_stline(int action, const char *replace, int len,
+ struct proxy *px, struct stream *s)
+{
+ struct htx *htx = htxbuf(&s->req.buf);
+
+ switch (action) {
+ case 0: // method
+ if (!http_replace_req_meth(htx, ist2(replace, len)))
+ return -1;
+ break;
+
+ case 1: // path
+ if (!http_replace_req_path(htx, ist2(replace, len), 0))
+ return -1;
+ break;
+
+ case 2: // query
+ if (!http_replace_req_query(htx, ist2(replace, len)))
+ return -1;
+ break;
+
+ case 3: // uri
+ if (!http_replace_req_uri(htx, ist2(replace, len)))
+ return -1;
+ break;
+
+ case 4: // path + query
+ if (!http_replace_req_path(htx, ist2(replace, len), 1))
+ return -1;
+ break;
+
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+/* This function replace the HTTP status code and the associated message. The
+ * variable <status> contains the new status code. This function never fails. It
+ * returns 0 in case of success, -1 in case of internal error.
+ */
+int http_res_set_status(unsigned int status, struct ist reason, struct stream *s)
+{
+ struct htx *htx = htxbuf(&s->res.buf);
+ char *res;
+
+ chunk_reset(&trash);
+ res = ultoa_o(status, trash.area, trash.size);
+ trash.data = res - trash.area;
+
+ /* Do we have a custom reason format string? */
+ if (!isttest(reason)) {
+ const char *str = http_get_reason(status);
+ reason = ist(str);
+ }
+
+ if (!http_replace_res_status(htx, ist2(trash.area, trash.data), reason))
+ return -1;
+ s->txn->status = status;
+ return 0;
+}
+
+/* Executes the http-request rules <rules> for stream <s>, proxy <px> and
+ * transaction <txn>. Returns the verdict of the first rule that prevents
+ * further processing of the request (auth, deny, ...), and defaults to
+ * HTTP_RULE_RES_STOP if it executed all rules or stopped on an allow, or
+ * HTTP_RULE_RES_CONT if the last rule was reached. It may set the TX_CLTARPIT
+ * on txn->flags if it encounters a tarpit rule. If <deny_status> is not NULL
+ * and a deny/tarpit rule is matched, it will be filled with this rule's deny
+ * status.
+ */
+static enum rule_result http_req_get_intercept_rule(struct proxy *px, struct list *def_rules,
+ struct list *rules, struct stream *s)
+{
+ struct session *sess = strm_sess(s);
+ struct http_txn *txn = s->txn;
+ struct act_rule *rule;
+ enum rule_result rule_ret = HTTP_RULE_RES_CONT;
+ int act_opts = 0;
+
+ /* If "the current_rule_list" match the executed rule list, we are in
+ * resume condition. If a resume is needed it is always in the action
+ * and never in the ACL or converters. In this case, we initialise the
+ * current rule, and go to the action execution point.
+ */
+ if (s->current_rule) {
+ rule = s->current_rule;
+ s->current_rule = NULL;
+ if (s->current_rule_list == rules || (def_rules && s->current_rule_list == def_rules))
+ goto resume_execution;
+ }
+ s->current_rule_list = ((!def_rules || s->current_rule_list == def_rules) ? rules : def_rules);
+
+ restart:
+ /* start the ruleset evaluation in strict mode */
+ txn->req.flags &= ~HTTP_MSGF_SOFT_RW;
+
+ list_for_each_entry(rule, s->current_rule_list, list) {
+ /* check optional condition */
+ if (rule->cond) {
+ int ret;
+
+ ret = acl_exec_cond(rule->cond, px, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);
+ ret = acl_pass(ret);
+
+ if (rule->cond->pol == ACL_COND_UNLESS)
+ ret = !ret;
+
+ if (!ret) /* condition not matched */
+ continue;
+ }
+
+ act_opts |= ACT_OPT_FIRST;
+ resume_execution:
+ if (rule->kw->flags & KWF_EXPERIMENTAL)
+ mark_tainted(TAINTED_ACTION_EXP_EXECUTED);
+
+ /* Always call the action function if defined */
+ if (rule->action_ptr) {
+ if ((s->req.flags & CF_READ_ERROR) ||
+ ((s->req.flags & (CF_SHUTR|CF_READ_NULL)) &&
+ (px->options & PR_O_ABRT_CLOSE)))
+ act_opts |= ACT_OPT_FINAL;
+
+ switch (rule->action_ptr(rule, px, sess, s, act_opts)) {
+ case ACT_RET_CONT:
+ break;
+ case ACT_RET_STOP:
+ rule_ret = HTTP_RULE_RES_STOP;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+ case ACT_RET_YIELD:
+ s->current_rule = rule;
+ rule_ret = HTTP_RULE_RES_YIELD;
+ goto end;
+ case ACT_RET_ERR:
+ rule_ret = HTTP_RULE_RES_ERROR;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+ case ACT_RET_DONE:
+ rule_ret = HTTP_RULE_RES_DONE;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+ case ACT_RET_DENY:
+ if (txn->status == -1)
+ txn->status = 403;
+ rule_ret = HTTP_RULE_RES_DENY;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+ case ACT_RET_ABRT:
+ rule_ret = HTTP_RULE_RES_ABRT;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+ case ACT_RET_INV:
+ rule_ret = HTTP_RULE_RES_BADREQ;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+ }
+ continue; /* eval the next rule */
+ }
+
+ /* If not action function defined, check for known actions */
+ switch (rule->action) {
+ case ACT_ACTION_ALLOW:
+ rule_ret = HTTP_RULE_RES_STOP;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+
+ case ACT_ACTION_DENY:
+ txn->status = rule->arg.http_reply->status;
+ txn->http_reply = rule->arg.http_reply;
+ rule_ret = HTTP_RULE_RES_DENY;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+
+ case ACT_HTTP_REQ_TARPIT:
+ txn->flags |= TX_CLTARPIT;
+ txn->status = rule->arg.http_reply->status;
+ txn->http_reply = rule->arg.http_reply;
+ rule_ret = HTTP_RULE_RES_DENY;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+
+ case ACT_HTTP_REDIR: {
+ int ret = http_apply_redirect_rule(rule->arg.redir, s, txn);
+
+ if (ret == 2) // 2 == skip
+ break;
+
+ rule_ret = ret ? HTTP_RULE_RES_ABRT : HTTP_RULE_RES_ERROR;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+ }
+
+ /* other flags exists, but normally, they never be matched. */
+ default:
+ break;
+ }
+ }
+
+ if (def_rules && s->current_rule_list == def_rules) {
+ s->current_rule_list = rules;
+ goto restart;
+ }
+
+ end:
+ /* if the ruleset evaluation is finished reset the strict mode */
+ if (rule_ret != HTTP_RULE_RES_YIELD)
+ txn->req.flags &= ~HTTP_MSGF_SOFT_RW;
+
+ /* we reached the end of the rules, nothing to report */
+ return rule_ret;
+}
+
+/* Executes the http-response rules <rules> for stream <s> and proxy <px>. It
+ * returns one of 5 possible statuses: HTTP_RULE_RES_CONT, HTTP_RULE_RES_STOP,
+ * HTTP_RULE_RES_DONE, HTTP_RULE_RES_YIELD, or HTTP_RULE_RES_BADREQ. If *CONT
+ * is returned, the process can continue the evaluation of next rule list. If
+ * *STOP or *DONE is returned, the process must stop the evaluation. If *BADREQ
+ * is returned, it means the operation could not be processed and a server error
+ * must be returned. If *YIELD is returned, the caller must call again the
+ * function with the same context.
+ */
+static enum rule_result http_res_get_intercept_rule(struct proxy *px, struct list *def_rules,
+ struct list *rules, struct stream *s)
+{
+ struct session *sess = strm_sess(s);
+ struct http_txn *txn = s->txn;
+ struct act_rule *rule;
+ enum rule_result rule_ret = HTTP_RULE_RES_CONT;
+ int act_opts = 0;
+
+ /* If "the current_rule_list" match the executed rule list, we are in
+ * resume condition. If a resume is needed it is always in the action
+ * and never in the ACL or converters. In this case, we initialise the
+ * current rule, and go to the action execution point.
+ */
+ if (s->current_rule) {
+ rule = s->current_rule;
+ s->current_rule = NULL;
+ if (s->current_rule_list == rules || (def_rules && s->current_rule_list == def_rules))
+ goto resume_execution;
+ }
+ s->current_rule_list = ((!def_rules || s->current_rule_list == def_rules) ? rules : def_rules);
+
+ restart:
+
+ /* start the ruleset evaluation in strict mode */
+ txn->rsp.flags &= ~HTTP_MSGF_SOFT_RW;
+
+ list_for_each_entry(rule, s->current_rule_list, list) {
+ /* check optional condition */
+ if (rule->cond) {
+ int ret;
+
+ ret = acl_exec_cond(rule->cond, px, sess, s, SMP_OPT_DIR_RES|SMP_OPT_FINAL);
+ ret = acl_pass(ret);
+
+ if (rule->cond->pol == ACL_COND_UNLESS)
+ ret = !ret;
+
+ if (!ret) /* condition not matched */
+ continue;
+ }
+
+ act_opts |= ACT_OPT_FIRST;
+resume_execution:
+ if (rule->kw->flags & KWF_EXPERIMENTAL)
+ mark_tainted(TAINTED_ACTION_EXP_EXECUTED);
+
+ /* Always call the action function if defined */
+ if (rule->action_ptr) {
+ if ((s->req.flags & CF_READ_ERROR) ||
+ ((s->req.flags & (CF_SHUTR|CF_READ_NULL)) &&
+ (px->options & PR_O_ABRT_CLOSE)))
+ act_opts |= ACT_OPT_FINAL;
+
+ switch (rule->action_ptr(rule, px, sess, s, act_opts)) {
+ case ACT_RET_CONT:
+ break;
+ case ACT_RET_STOP:
+ rule_ret = HTTP_RULE_RES_STOP;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+ case ACT_RET_YIELD:
+ s->current_rule = rule;
+ rule_ret = HTTP_RULE_RES_YIELD;
+ goto end;
+ case ACT_RET_ERR:
+ rule_ret = HTTP_RULE_RES_ERROR;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+ case ACT_RET_DONE:
+ rule_ret = HTTP_RULE_RES_DONE;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+ case ACT_RET_DENY:
+ if (txn->status == -1)
+ txn->status = 502;
+ rule_ret = HTTP_RULE_RES_DENY;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+ case ACT_RET_ABRT:
+ rule_ret = HTTP_RULE_RES_ABRT;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+ case ACT_RET_INV:
+ rule_ret = HTTP_RULE_RES_BADREQ;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+ }
+ continue; /* eval the next rule */
+ }
+
+ /* If not action function defined, check for known actions */
+ switch (rule->action) {
+ case ACT_ACTION_ALLOW:
+ rule_ret = HTTP_RULE_RES_STOP; /* "allow" rules are OK */
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+
+ case ACT_ACTION_DENY:
+ txn->status = rule->arg.http_reply->status;
+ txn->http_reply = rule->arg.http_reply;
+ rule_ret = HTTP_RULE_RES_DENY;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+
+ case ACT_HTTP_REDIR: {
+ int ret = http_apply_redirect_rule(rule->arg.redir, s, txn);
+
+ if (ret == 2) // 2 == skip
+ break;
+
+ rule_ret = ret ? HTTP_RULE_RES_ABRT : HTTP_RULE_RES_ERROR;
+ s->last_rule_file = rule->conf.file;
+ s->last_rule_line = rule->conf.line;
+ goto end;
+ }
+ /* other flags exists, but normally, they never be matched. */
+ default:
+ break;
+ }
+ }
+
+ if (def_rules && s->current_rule_list == def_rules) {
+ s->current_rule_list = rules;
+ goto restart;
+ }
+
+ end:
+ /* if the ruleset evaluation is finished reset the strict mode */
+ if (rule_ret != HTTP_RULE_RES_YIELD)
+ txn->rsp.flags &= ~HTTP_MSGF_SOFT_RW;
+
+ /* we reached the end of the rules, nothing to report */
+ return rule_ret;
+}
+
+/* Executes backend and frontend http-after-response rules for the stream <s>,
+ * in that order. it return 1 on success and 0 on error. It is the caller
+ * responsibility to catch error or ignore it. If it catches it, this function
+ * may be called a second time, for the internal error.
+ */
+int http_eval_after_res_rules(struct stream *s)
+{
+ struct list *def_rules, *rules;
+ struct session *sess = s->sess;
+ enum rule_result ret = HTTP_RULE_RES_CONT;
+
+ /* Eval after-response ruleset only if the reply is not const */
+ if (s->txn->flags & TX_CONST_REPLY)
+ goto end;
+
+ /* prune the request variables if not already done and swap to the response variables. */
+ if (s->vars_reqres.scope != SCOPE_RES) {
+ if (!LIST_ISEMPTY(&s->vars_reqres.head))
+ vars_prune(&s->vars_reqres, s->sess, s);
+ vars_init_head(&s->vars_reqres, SCOPE_RES);
+ }
+
+ def_rules = (s->be->defpx ? &s->be->defpx->http_after_res_rules : NULL);
+ rules = &s->be->http_after_res_rules;
+
+ ret = http_res_get_intercept_rule(s->be, def_rules, rules, s);
+ if ((ret == HTTP_RULE_RES_CONT || ret == HTTP_RULE_RES_STOP) && sess->fe != s->be) {
+ def_rules = ((sess->fe->defpx && sess->fe->defpx != s->be->defpx) ? &sess->fe->defpx->http_after_res_rules : NULL);
+ rules = &sess->fe->http_after_res_rules;
+ ret = http_res_get_intercept_rule(sess->fe, def_rules, rules, s);
+ }
+
+ end:
+ /* All other codes than CONTINUE, STOP or DONE are forbidden */
+ return (ret == HTTP_RULE_RES_CONT || ret == HTTP_RULE_RES_STOP || ret == HTTP_RULE_RES_DONE);
+}
+
+/*
+ * Manage client-side cookie. It can impact performance by about 2% so it is
+ * desirable to call it only when needed. This code is quite complex because
+ * of the multiple very crappy and ambiguous syntaxes we have to support. it
+ * highly recommended not to touch this part without a good reason !
+ */
+static void http_manage_client_side_cookies(struct stream *s, struct channel *req)
+{
+ struct session *sess = s->sess;
+ struct http_txn *txn = s->txn;
+ struct htx *htx;
+ struct http_hdr_ctx ctx;
+ char *hdr_beg, *hdr_end, *del_from;
+ char *prev, *att_beg, *att_end, *equal, *val_beg, *val_end, *next;
+ int preserve_hdr;
+
+ htx = htxbuf(&req->buf);
+ ctx.blk = NULL;
+ while (http_find_header(htx, ist("Cookie"), &ctx, 1)) {
+ int is_first = 1;
+ del_from = NULL; /* nothing to be deleted */
+ preserve_hdr = 0; /* assume we may kill the whole header */
+
+ /* Now look for cookies. Conforming to RFC2109, we have to support
+ * attributes whose name begin with a '$', and associate them with
+ * the right cookie, if we want to delete this cookie.
+ * So there are 3 cases for each cookie read :
+ * 1) it's a special attribute, beginning with a '$' : ignore it.
+ * 2) it's a server id cookie that we *MAY* want to delete : save
+ * some pointers on it (last semi-colon, beginning of cookie...)
+ * 3) it's an application cookie : we *MAY* have to delete a previous
+ * "special" cookie.
+ * At the end of loop, if a "special" cookie remains, we may have to
+ * remove it. If no application cookie persists in the header, we
+ * *MUST* delete it.
+ *
+ * Note: RFC2965 is unclear about the processing of spaces around
+ * the equal sign in the ATTR=VALUE form. A careful inspection of
+ * the RFC explicitly allows spaces before it, and not within the
+ * tokens (attrs or values). An inspection of RFC2109 allows that
+ * too but section 10.1.3 lets one think that spaces may be allowed
+ * after the equal sign too, resulting in some (rare) buggy
+ * implementations trying to do that. So let's do what servers do.
+ * Latest ietf draft forbids spaces all around. Also, earlier RFCs
+ * allowed quoted strings in values, with any possible character
+ * after a backslash, including control chars and delimiters, which
+ * causes parsing to become ambiguous. Browsers also allow spaces
+ * within values even without quotes.
+ *
+ * We have to keep multiple pointers in order to support cookie
+ * removal at the beginning, middle or end of header without
+ * corrupting the header. All of these headers are valid :
+ *
+ * hdr_beg hdr_end
+ * | |
+ * v |
+ * NAME1=VALUE1;NAME2=VALUE2;NAME3=VALUE3 |
+ * NAME1=VALUE1;NAME2_ONLY ;NAME3=VALUE3 v
+ * NAME1 = VALUE 1 ; NAME2 = VALUE2 ; NAME3 = VALUE3
+ * | | | | | | |
+ * | | | | | | |
+ * | | | | | | +--> next
+ * | | | | | +----> val_end
+ * | | | | +-----------> val_beg
+ * | | | +--------------> equal
+ * | | +----------------> att_end
+ * | +---------------------> att_beg
+ * +--------------------------> prev
+ *
+ */
+ hdr_beg = ctx.value.ptr;
+ hdr_end = hdr_beg + ctx.value.len;
+ for (prev = hdr_beg; prev < hdr_end; prev = next) {
+ /* Iterate through all cookies on this line */
+
+ /* find att_beg */
+ att_beg = prev;
+ if (!is_first)
+ att_beg++;
+ is_first = 0;
+
+ while (att_beg < hdr_end && HTTP_IS_SPHT(*att_beg))
+ att_beg++;
+
+ /* find att_end : this is the first character after the last non
+ * space before the equal. It may be equal to hdr_end.
+ */
+ equal = att_end = att_beg;
+ while (equal < hdr_end) {
+ if (*equal == '=' || *equal == ',' || *equal == ';')
+ break;
+ if (HTTP_IS_SPHT(*equal++))
+ continue;
+ att_end = equal;
+ }
+
+ /* here, <equal> points to '=', a delimiter or the end. <att_end>
+ * is between <att_beg> and <equal>, both may be identical.
+ */
+ /* look for end of cookie if there is an equal sign */
+ if (equal < hdr_end && *equal == '=') {
+ /* look for the beginning of the value */
+ val_beg = equal + 1;
+ while (val_beg < hdr_end && HTTP_IS_SPHT(*val_beg))
+ val_beg++;
+
+ /* find the end of the value, respecting quotes */
+ next = http_find_cookie_value_end(val_beg, hdr_end);
+
+ /* make val_end point to the first white space or delimiter after the value */
+ val_end = next;
+ while (val_end > val_beg && HTTP_IS_SPHT(*(val_end - 1)))
+ val_end--;
+ }
+ else
+ val_beg = val_end = next = equal;
+
+ /* We have nothing to do with attributes beginning with
+ * '$'. However, they will automatically be removed if a
+ * header before them is removed, since they're supposed
+ * to be linked together.
+ */
+ if (*att_beg == '$')
+ continue;
+
+ /* Ignore cookies with no equal sign */
+ if (equal == next) {
+ /* This is not our cookie, so we must preserve it. But if we already
+ * scheduled another cookie for removal, we cannot remove the
+ * complete header, but we can remove the previous block itself.
+ */
+ preserve_hdr = 1;
+ if (del_from != NULL) {
+ int delta = http_del_hdr_value(hdr_beg, hdr_end, &del_from, prev);
+ val_end += delta;
+ next += delta;
+ hdr_end += delta;
+ prev = del_from;
+ del_from = NULL;
+ }
+ continue;
+ }
+
+ /* if there are spaces around the equal sign, we need to
+ * strip them otherwise we'll get trouble for cookie captures,
+ * or even for rewrites. Since this happens extremely rarely,
+ * it does not hurt performance.
+ */
+ if (unlikely(att_end != equal || val_beg > equal + 1)) {
+ int stripped_before = 0;
+ int stripped_after = 0;
+
+ if (att_end != equal) {
+ memmove(att_end, equal, hdr_end - equal);
+ stripped_before = (att_end - equal);
+ equal += stripped_before;
+ val_beg += stripped_before;
+ }
+
+ if (val_beg > equal + 1) {
+ memmove(equal + 1, val_beg, hdr_end + stripped_before - val_beg);
+ stripped_after = (equal + 1) - val_beg;
+ val_beg += stripped_after;
+ stripped_before += stripped_after;
+ }
+
+ val_end += stripped_before;
+ next += stripped_before;
+ hdr_end += stripped_before;
+ }
+ /* now everything is as on the diagram above */
+
+ /* First, let's see if we want to capture this cookie. We check
+ * that we don't already have a client side cookie, because we
+ * can only capture one. Also as an optimisation, we ignore
+ * cookies shorter than the declared name.
+ */
+ if (sess->fe->capture_name != NULL && txn->cli_cookie == NULL &&
+ (val_end - att_beg >= sess->fe->capture_namelen) &&
+ memcmp(att_beg, sess->fe->capture_name, sess->fe->capture_namelen) == 0) {
+ int log_len = val_end - att_beg;
+
+ if ((txn->cli_cookie = pool_alloc(pool_head_capture)) == NULL) {
+ ha_alert("HTTP logging : out of memory.\n");
+ } else {
+ if (log_len > sess->fe->capture_len)
+ log_len = sess->fe->capture_len;
+ memcpy(txn->cli_cookie, att_beg, log_len);
+ txn->cli_cookie[log_len] = 0;
+ }
+ }
+
+ /* Persistence cookies in passive, rewrite or insert mode have the
+ * following form :
+ *
+ * Cookie: NAME=SRV[|<lastseen>[|<firstseen>]]
+ *
+ * For cookies in prefix mode, the form is :
+ *
+ * Cookie: NAME=SRV~VALUE
+ */
+ if ((att_end - att_beg == s->be->cookie_len) && (s->be->cookie_name != NULL) &&
+ (memcmp(att_beg, s->be->cookie_name, att_end - att_beg) == 0)) {
+ struct server *srv = s->be->srv;
+ char *delim;
+
+ /* if we're in cookie prefix mode, we'll search the delimiter so that we
+ * have the server ID between val_beg and delim, and the original cookie between
+ * delim+1 and val_end. Otherwise, delim==val_end :
+ *
+ * hdr_beg
+ * |
+ * v
+ * NAME=SRV; # in all but prefix modes
+ * NAME=SRV~OPAQUE ; # in prefix mode
+ * || || | |+-> next
+ * || || | +--> val_end
+ * || || +---------> delim
+ * || |+------------> val_beg
+ * || +-------------> att_end = equal
+ * |+-----------------> att_beg
+ * +------------------> prev
+ *
+ */
+ if (s->be->ck_opts & PR_CK_PFX) {
+ for (delim = val_beg; delim < val_end; delim++)
+ if (*delim == COOKIE_DELIM)
+ break;
+ }
+ else {
+ char *vbar1;
+ delim = val_end;
+ /* Now check if the cookie contains a date field, which would
+ * appear after a vertical bar ('|') just after the server name
+ * and before the delimiter.
+ */
+ vbar1 = memchr(val_beg, COOKIE_DELIM_DATE, val_end - val_beg);
+ if (vbar1) {
+ /* OK, so left of the bar is the server's cookie and
+ * right is the last seen date. It is a base64 encoded
+ * 30-bit value representing the UNIX date since the
+ * epoch in 4-second quantities.
+ */
+ int val;
+ delim = vbar1++;
+ if (val_end - vbar1 >= 5) {
+ val = b64tos30(vbar1);
+ if (val > 0)
+ txn->cookie_last_date = val << 2;
+ }
+ /* look for a second vertical bar */
+ vbar1 = memchr(vbar1, COOKIE_DELIM_DATE, val_end - vbar1);
+ if (vbar1 && (val_end - vbar1 > 5)) {
+ val = b64tos30(vbar1 + 1);
+ if (val > 0)
+ txn->cookie_first_date = val << 2;
+ }
+ }
+ }
+
+ /* if the cookie has an expiration date and the proxy wants to check
+ * it, then we do that now. We first check if the cookie is too old,
+ * then only if it has expired. We detect strict overflow because the
+ * time resolution here is not great (4 seconds). Cookies with dates
+ * in the future are ignored if their offset is beyond one day. This
+ * allows an admin to fix timezone issues without expiring everyone
+ * and at the same time avoids keeping unwanted side effects for too
+ * long.
+ */
+ if (txn->cookie_first_date && s->be->cookie_maxlife &&
+ (((signed)(date.tv_sec - txn->cookie_first_date) > (signed)s->be->cookie_maxlife) ||
+ ((signed)(txn->cookie_first_date - date.tv_sec) > 86400))) {
+ txn->flags &= ~TX_CK_MASK;
+ txn->flags |= TX_CK_OLD;
+ delim = val_beg; // let's pretend we have not found the cookie
+ txn->cookie_first_date = 0;
+ txn->cookie_last_date = 0;
+ }
+ else if (txn->cookie_last_date && s->be->cookie_maxidle &&
+ (((signed)(date.tv_sec - txn->cookie_last_date) > (signed)s->be->cookie_maxidle) ||
+ ((signed)(txn->cookie_last_date - date.tv_sec) > 86400))) {
+ txn->flags &= ~TX_CK_MASK;
+ txn->flags |= TX_CK_EXPIRED;
+ delim = val_beg; // let's pretend we have not found the cookie
+ txn->cookie_first_date = 0;
+ txn->cookie_last_date = 0;
+ }
+
+ /* Here, we'll look for the first running server which supports the cookie.
+ * This allows to share a same cookie between several servers, for example
+ * to dedicate backup servers to specific servers only.
+ * However, to prevent clients from sticking to cookie-less backup server
+ * when they have incidentely learned an empty cookie, we simply ignore
+ * empty cookies and mark them as invalid.
+ * The same behaviour is applied when persistence must be ignored.
+ */
+ if ((delim == val_beg) || (s->flags & (SF_IGNORE_PRST | SF_ASSIGNED)))
+ srv = NULL;
+
+ while (srv) {
+ if (srv->cookie && (srv->cklen == delim - val_beg) &&
+ !memcmp(val_beg, srv->cookie, delim - val_beg)) {
+ if ((srv->cur_state != SRV_ST_STOPPED) ||
+ (s->be->options & PR_O_PERSIST) ||
+ (s->flags & SF_FORCE_PRST)) {
+ /* we found the server and we can use it */
+ txn->flags &= ~TX_CK_MASK;
+ txn->flags |= (srv->cur_state != SRV_ST_STOPPED) ? TX_CK_VALID : TX_CK_DOWN;
+ s->flags |= SF_DIRECT | SF_ASSIGNED;
+ s->target = &srv->obj_type;
+ break;
+ } else {
+ /* we found a server, but it's down,
+ * mark it as such and go on in case
+ * another one is available.
+ */
+ txn->flags &= ~TX_CK_MASK;
+ txn->flags |= TX_CK_DOWN;
+ }
+ }
+ srv = srv->next;
+ }
+
+ if (!srv && !(txn->flags & (TX_CK_DOWN|TX_CK_EXPIRED|TX_CK_OLD))) {
+ /* no server matched this cookie or we deliberately skipped it */
+ txn->flags &= ~TX_CK_MASK;
+ if ((s->flags & (SF_IGNORE_PRST | SF_ASSIGNED)))
+ txn->flags |= TX_CK_UNUSED;
+ else
+ txn->flags |= TX_CK_INVALID;
+ }
+
+ /* depending on the cookie mode, we may have to either :
+ * - delete the complete cookie if we're in insert+indirect mode, so that
+ * the server never sees it ;
+ * - remove the server id from the cookie value, and tag the cookie as an
+ * application cookie so that it does not get accidentally removed later,
+ * if we're in cookie prefix mode
+ */
+ if ((s->be->ck_opts & PR_CK_PFX) && (delim != val_end)) {
+ int delta; /* negative */
+
+ memmove(val_beg, delim + 1, hdr_end - (delim + 1));
+ delta = val_beg - (delim + 1);
+ val_end += delta;
+ next += delta;
+ hdr_end += delta;
+ del_from = NULL;
+ preserve_hdr = 1; /* we want to keep this cookie */
+ }
+ else if (del_from == NULL &&
+ (s->be->ck_opts & (PR_CK_INS | PR_CK_IND)) == (PR_CK_INS | PR_CK_IND)) {
+ del_from = prev;
+ }
+ }
+ else {
+ /* This is not our cookie, so we must preserve it. But if we already
+ * scheduled another cookie for removal, we cannot remove the
+ * complete header, but we can remove the previous block itself.
+ */
+ preserve_hdr = 1;
+
+ if (del_from != NULL) {
+ int delta = http_del_hdr_value(hdr_beg, hdr_end, &del_from, prev);
+ if (att_beg >= del_from)
+ att_beg += delta;
+ if (att_end >= del_from)
+ att_end += delta;
+ val_beg += delta;
+ val_end += delta;
+ next += delta;
+ hdr_end += delta;
+ prev = del_from;
+ del_from = NULL;
+ }
+ }
+
+ } /* for each cookie */
+
+
+ /* There are no more cookies on this line.
+ * We may still have one (or several) marked for deletion at the
+ * end of the line. We must do this now in two ways :
+ * - if some cookies must be preserved, we only delete from the
+ * mark to the end of line ;
+ * - if nothing needs to be preserved, simply delete the whole header
+ */
+ if (del_from) {
+ hdr_end = (preserve_hdr ? del_from : hdr_beg);
+ }
+ if ((hdr_end - hdr_beg) != ctx.value.len) {
+ if (hdr_beg != hdr_end)
+ htx_change_blk_value_len(htx, ctx.blk, hdr_end - hdr_beg);
+ else
+ http_remove_header(htx, &ctx);
+ }
+ } /* for each "Cookie header */
+}
+
+/*
+ * Manage server-side cookies. It can impact performance by about 2% so it is
+ * desirable to call it only when needed. This function is also used when we
+ * just need to know if there is a cookie (eg: for check-cache).
+ */
+static void http_manage_server_side_cookies(struct stream *s, struct channel *res)
+{
+ struct session *sess = s->sess;
+ struct http_txn *txn = s->txn;
+ struct htx *htx;
+ struct http_hdr_ctx ctx;
+ struct server *srv;
+ char *hdr_beg, *hdr_end;
+ char *prev, *att_beg, *att_end, *equal, *val_beg, *val_end, *next;
+ int is_cookie2 = 0;
+
+ htx = htxbuf(&res->buf);
+
+ ctx.blk = NULL;
+ while (1) {
+ int is_first = 1;
+
+ if (is_cookie2 || !http_find_header(htx, ist("Set-Cookie"), &ctx, 1)) {
+ if (!http_find_header(htx, ist("Set-Cookie2"), &ctx, 1))
+ break;
+ is_cookie2 = 1;
+ }
+
+ /* OK, right now we know we have a Set-Cookie* at hdr_beg, and
+ * <prev> points to the colon.
+ */
+ txn->flags |= TX_SCK_PRESENT;
+
+ /* Maybe we only wanted to see if there was a Set-Cookie (eg:
+ * check-cache is enabled) and we are not interested in checking
+ * them. Warning, the cookie capture is declared in the frontend.
+ */
+ if (s->be->cookie_name == NULL && sess->fe->capture_name == NULL)
+ break;
+
+ /* OK so now we know we have to process this response cookie.
+ * The format of the Set-Cookie header is slightly different
+ * from the format of the Cookie header in that it does not
+ * support the comma as a cookie delimiter (thus the header
+ * cannot be folded) because the Expires attribute described in
+ * the original Netscape's spec may contain an unquoted date
+ * with a comma inside. We have to live with this because
+ * many browsers don't support Max-Age and some browsers don't
+ * support quoted strings. However the Set-Cookie2 header is
+ * clean.
+ *
+ * We have to keep multiple pointers in order to support cookie
+ * removal at the beginning, middle or end of header without
+ * corrupting the header (in case of set-cookie2). A special
+ * pointer, <scav> points to the beginning of the set-cookie-av
+ * fields after the first semi-colon. The <next> pointer points
+ * either to the end of line (set-cookie) or next unquoted comma
+ * (set-cookie2). All of these headers are valid :
+ *
+ * hdr_beg hdr_end
+ * | |
+ * v |
+ * NAME1 = VALUE 1 ; Secure; Path="/" |
+ * NAME=VALUE; Secure; Expires=Thu, 01-Jan-1970 00:00:01 GMT v
+ * NAME = VALUE ; Secure; Expires=Thu, 01-Jan-1970 00:00:01 GMT
+ * NAME1 = VALUE 1 ; Max-Age=0, NAME2=VALUE2; Discard
+ * | | | | | | | |
+ * | | | | | | | +-> next
+ * | | | | | | +------------> scav
+ * | | | | | +--------------> val_end
+ * | | | | +--------------------> val_beg
+ * | | | +----------------------> equal
+ * | | +------------------------> att_end
+ * | +----------------------------> att_beg
+ * +------------------------------> prev
+ * -------------------------------> hdr_beg
+ */
+ hdr_beg = ctx.value.ptr;
+ hdr_end = hdr_beg + ctx.value.len;
+ for (prev = hdr_beg; prev < hdr_end; prev = next) {
+
+ /* Iterate through all cookies on this line */
+
+ /* find att_beg */
+ att_beg = prev;
+ if (!is_first)
+ att_beg++;
+ is_first = 0;
+
+ while (att_beg < hdr_end && HTTP_IS_SPHT(*att_beg))
+ att_beg++;
+
+ /* find att_end : this is the first character after the last non
+ * space before the equal. It may be equal to hdr_end.
+ */
+ equal = att_end = att_beg;
+
+ while (equal < hdr_end) {
+ if (*equal == '=' || *equal == ';' || (is_cookie2 && *equal == ','))
+ break;
+ if (HTTP_IS_SPHT(*equal++))
+ continue;
+ att_end = equal;
+ }
+
+ /* here, <equal> points to '=', a delimiter or the end. <att_end>
+ * is between <att_beg> and <equal>, both may be identical.
+ */
+
+ /* look for end of cookie if there is an equal sign */
+ if (equal < hdr_end && *equal == '=') {
+ /* look for the beginning of the value */
+ val_beg = equal + 1;
+ while (val_beg < hdr_end && HTTP_IS_SPHT(*val_beg))
+ val_beg++;
+
+ /* find the end of the value, respecting quotes */
+ next = http_find_cookie_value_end(val_beg, hdr_end);
+
+ /* make val_end point to the first white space or delimiter after the value */
+ val_end = next;
+ while (val_end > val_beg && HTTP_IS_SPHT(*(val_end - 1)))
+ val_end--;
+ }
+ else {
+ /* <equal> points to next comma, semi-colon or EOL */
+ val_beg = val_end = next = equal;
+ }
+
+ if (next < hdr_end) {
+ /* Set-Cookie2 supports multiple cookies, and <next> points to
+ * a colon or semi-colon before the end. So skip all attr-value
+ * pairs and look for the next comma. For Set-Cookie, since
+ * commas are permitted in values, skip to the end.
+ */
+ if (is_cookie2)
+ next = http_find_hdr_value_end(next, hdr_end);
+ else
+ next = hdr_end;
+ }
+
+ /* Now everything is as on the diagram above */
+
+ /* Ignore cookies with no equal sign */
+ if (equal == val_end)
+ continue;
+
+ /* If there are spaces around the equal sign, we need to
+ * strip them otherwise we'll get trouble for cookie captures,
+ * or even for rewrites. Since this happens extremely rarely,
+ * it does not hurt performance.
+ */
+ if (unlikely(att_end != equal || val_beg > equal + 1)) {
+ int stripped_before = 0;
+ int stripped_after = 0;
+
+ if (att_end != equal) {
+ memmove(att_end, equal, hdr_end - equal);
+ stripped_before = (att_end - equal);
+ equal += stripped_before;
+ val_beg += stripped_before;
+ }
+
+ if (val_beg > equal + 1) {
+ memmove(equal + 1, val_beg, hdr_end + stripped_before - val_beg);
+ stripped_after = (equal + 1) - val_beg;
+ val_beg += stripped_after;
+ stripped_before += stripped_after;
+ }
+
+ val_end += stripped_before;
+ next += stripped_before;
+ hdr_end += stripped_before;
+
+ htx_change_blk_value_len(htx, ctx.blk, hdr_end - hdr_beg);
+ ctx.value.len = hdr_end - hdr_beg;
+ }
+
+ /* First, let's see if we want to capture this cookie. We check
+ * that we don't already have a server side cookie, because we
+ * can only capture one. Also as an optimisation, we ignore
+ * cookies shorter than the declared name.
+ */
+ if (sess->fe->capture_name != NULL &&
+ txn->srv_cookie == NULL &&
+ (val_end - att_beg >= sess->fe->capture_namelen) &&
+ memcmp(att_beg, sess->fe->capture_name, sess->fe->capture_namelen) == 0) {
+ int log_len = val_end - att_beg;
+ if ((txn->srv_cookie = pool_alloc(pool_head_capture)) == NULL) {
+ ha_alert("HTTP logging : out of memory.\n");
+ }
+ else {
+ if (log_len > sess->fe->capture_len)
+ log_len = sess->fe->capture_len;
+ memcpy(txn->srv_cookie, att_beg, log_len);
+ txn->srv_cookie[log_len] = 0;
+ }
+ }
+
+ srv = objt_server(s->target);
+ /* now check if we need to process it for persistence */
+ if (!(s->flags & SF_IGNORE_PRST) &&
+ (att_end - att_beg == s->be->cookie_len) && (s->be->cookie_name != NULL) &&
+ (memcmp(att_beg, s->be->cookie_name, att_end - att_beg) == 0)) {
+ /* assume passive cookie by default */
+ txn->flags &= ~TX_SCK_MASK;
+ txn->flags |= TX_SCK_FOUND;
+
+ /* If the cookie is in insert mode on a known server, we'll delete
+ * this occurrence because we'll insert another one later.
+ * We'll delete it too if the "indirect" option is set and we're in
+ * a direct access.
+ */
+ if (s->be->ck_opts & PR_CK_PSV) {
+ /* The "preserve" flag was set, we don't want to touch the
+ * server's cookie.
+ */
+ }
+ else if ((srv && (s->be->ck_opts & PR_CK_INS)) ||
+ ((s->flags & SF_DIRECT) && (s->be->ck_opts & PR_CK_IND))) {
+ /* this cookie must be deleted */
+ if (prev == hdr_beg && next == hdr_end) {
+ /* whole header */
+ http_remove_header(htx, &ctx);
+ /* note: while both invalid now, <next> and <hdr_end>
+ * are still equal, so the for() will stop as expected.
+ */
+ } else {
+ /* just remove the value */
+ int delta = http_del_hdr_value(hdr_beg, hdr_end, &prev, next);
+ next = prev;
+ hdr_end += delta;
+ }
+ txn->flags &= ~TX_SCK_MASK;
+ txn->flags |= TX_SCK_DELETED;
+ /* and go on with next cookie */
+ }
+ else if (srv && srv->cookie && (s->be->ck_opts & PR_CK_RW)) {
+ /* replace bytes val_beg->val_end with the cookie name associated
+ * with this server since we know it.
+ */
+ int sliding, delta;
+
+ ctx.value = ist2(val_beg, val_end - val_beg);
+ ctx.lws_before = ctx.lws_after = 0;
+ http_replace_header_value(htx, &ctx, ist2(srv->cookie, srv->cklen));
+ delta = srv->cklen - (val_end - val_beg);
+ sliding = (ctx.value.ptr - val_beg);
+ hdr_beg += sliding;
+ val_beg += sliding;
+ next += sliding + delta;
+ hdr_end += sliding + delta;
+
+ txn->flags &= ~TX_SCK_MASK;
+ txn->flags |= TX_SCK_REPLACED;
+ }
+ else if (srv && srv->cookie && (s->be->ck_opts & PR_CK_PFX)) {
+ /* insert the cookie name associated with this server
+ * before existing cookie, and insert a delimiter between them..
+ */
+ int sliding, delta;
+ ctx.value = ist2(val_beg, 0);
+ ctx.lws_before = ctx.lws_after = 0;
+ http_replace_header_value(htx, &ctx, ist2(srv->cookie, srv->cklen + 1));
+ delta = srv->cklen + 1;
+ sliding = (ctx.value.ptr - val_beg);
+ hdr_beg += sliding;
+ val_beg += sliding;
+ next += sliding + delta;
+ hdr_end += sliding + delta;
+
+ val_beg[srv->cklen] = COOKIE_DELIM;
+ txn->flags &= ~TX_SCK_MASK;
+ txn->flags |= TX_SCK_REPLACED;
+ }
+ }
+ /* that's done for this cookie, check the next one on the same
+ * line when next != hdr_end (only if is_cookie2).
+ */
+ }
+ }
+}
+
+/*
+ * Parses the Cache-Control and Pragma request header fields to determine if
+ * the request may be served from the cache and/or if it is cacheable. Updates
+ * s->txn->flags.
+ */
+void http_check_request_for_cacheability(struct stream *s, struct channel *req)
+{
+ struct http_txn *txn = s->txn;
+ struct htx *htx;
+ struct http_hdr_ctx ctx = { .blk = NULL };
+ int pragma_found, cc_found;
+
+ if ((txn->flags & (TX_CACHEABLE|TX_CACHE_IGNORE)) == TX_CACHE_IGNORE)
+ return; /* nothing more to do here */
+
+ htx = htxbuf(&req->buf);
+ pragma_found = cc_found = 0;
+
+ /* Check "pragma" header for HTTP/1.0 compatibility. */
+ if (http_find_header(htx, ist("pragma"), &ctx, 1)) {
+ if (isteqi(ctx.value, ist("no-cache"))) {
+ pragma_found = 1;
+ }
+ }
+
+ ctx.blk = NULL;
+ /* Don't use the cache and don't try to store if we found the
+ * Authorization header */
+ if (http_find_header(htx, ist("authorization"), &ctx, 1)) {
+ txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;
+ txn->flags |= TX_CACHE_IGNORE;
+ }
+
+
+ /* Look for "cache-control" header and iterate over all the values
+ * until we find one that specifies that caching is possible or not. */
+ ctx.blk = NULL;
+ while (http_find_header(htx, ist("cache-control"), &ctx, 0)) {
+ cc_found = 1;
+ /* We don't check the values after max-age, max-stale nor min-fresh,
+ * we simply don't use the cache when they're specified. */
+ if (istmatchi(ctx.value, ist("max-age")) ||
+ istmatchi(ctx.value, ist("no-cache")) ||
+ istmatchi(ctx.value, ist("max-stale")) ||
+ istmatchi(ctx.value, ist("min-fresh"))) {
+ txn->flags |= TX_CACHE_IGNORE;
+ continue;
+ }
+ if (istmatchi(ctx.value, ist("no-store"))) {
+ txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;
+ continue;
+ }
+ }
+
+ /* RFC7234#5.4:
+ * When the Cache-Control header field is also present and
+ * understood in a request, Pragma is ignored.
+ * When the Cache-Control header field is not present in a
+ * request, caches MUST consider the no-cache request
+ * pragma-directive as having the same effect as if
+ * "Cache-Control: no-cache" were present.
+ */
+ if (!cc_found && pragma_found)
+ txn->flags |= TX_CACHE_IGNORE;
+}
+
+/*
+ * Check if response is cacheable or not. Updates s->txn->flags.
+ */
+void http_check_response_for_cacheability(struct stream *s, struct channel *res)
+{
+ struct http_txn *txn = s->txn;
+ struct http_hdr_ctx ctx = { .blk = NULL };
+ struct htx *htx;
+ int has_freshness_info = 0;
+ int has_validator = 0;
+
+ if (txn->status < 200) {
+ /* do not try to cache interim responses! */
+ txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;
+ return;
+ }
+
+ htx = htxbuf(&res->buf);
+ /* Check "pragma" header for HTTP/1.0 compatibility. */
+ if (http_find_header(htx, ist("pragma"), &ctx, 1)) {
+ if (isteqi(ctx.value, ist("no-cache"))) {
+ txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;
+ return;
+ }
+ }
+
+ /* Look for "cache-control" header and iterate over all the values
+ * until we find one that specifies that caching is possible or not. */
+ ctx.blk = NULL;
+ while (http_find_header(htx, ist("cache-control"), &ctx, 0)) {
+ if (isteqi(ctx.value, ist("public"))) {
+ txn->flags |= TX_CACHEABLE | TX_CACHE_COOK;
+ continue;
+ }
+ if (isteqi(ctx.value, ist("private")) ||
+ isteqi(ctx.value, ist("no-cache")) ||
+ isteqi(ctx.value, ist("no-store")) ||
+ isteqi(ctx.value, ist("max-age=0")) ||
+ isteqi(ctx.value, ist("s-maxage=0"))) {
+ txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;
+ continue;
+ }
+ /* We might have a no-cache="set-cookie" form. */
+ if (istmatchi(ctx.value, ist("no-cache=\"set-cookie"))) {
+ txn->flags &= ~TX_CACHE_COOK;
+ continue;
+ }
+
+ if (istmatchi(ctx.value, ist("s-maxage")) ||
+ istmatchi(ctx.value, ist("max-age"))) {
+ has_freshness_info = 1;
+ continue;
+ }
+ }
+
+ /* If no freshness information could be found in Cache-Control values,
+ * look for an Expires header. */
+ if (!has_freshness_info) {
+ ctx.blk = NULL;
+ has_freshness_info = http_find_header(htx, ist("expires"), &ctx, 0);
+ }
+
+ /* If no freshness information could be found in Cache-Control or Expires
+ * values, look for an explicit validator. */
+ if (!has_freshness_info) {
+ ctx.blk = NULL;
+ has_validator = 1;
+ if (!http_find_header(htx, ist("etag"), &ctx, 0)) {
+ ctx.blk = NULL;
+ if (!http_find_header(htx, ist("last-modified"), &ctx, 0))
+ has_validator = 0;
+ }
+ }
+
+ /* We won't store an entry that has neither a cache validator nor an
+ * explicit expiration time, as suggested in RFC 7234#3. */
+ if (!has_freshness_info && !has_validator)
+ txn->flags &= ~TX_CACHEABLE;
+}
+
+/*
+ * In a GET, HEAD or POST request, check if the requested URI matches the stats uri
+ * for the current backend.
+ *
+ * It is assumed that the request is either a HEAD, GET, or POST and that the
+ * uri_auth field is valid.
+ *
+ * Returns 1 if stats should be provided, otherwise 0.
+ */
+static int http_stats_check_uri(struct stream *s, struct http_txn *txn, struct proxy *backend)
+{
+ struct uri_auth *uri_auth = backend->uri_auth;
+ struct htx *htx;
+ struct htx_sl *sl;
+ struct ist uri;
+
+ if (!uri_auth)
+ return 0;
+
+ if (txn->meth != HTTP_METH_GET && txn->meth != HTTP_METH_HEAD && txn->meth != HTTP_METH_POST)
+ return 0;
+
+ htx = htxbuf(&s->req.buf);
+ sl = http_get_stline(htx);
+ uri = htx_sl_req_uri(sl);
+ if (*uri_auth->uri_prefix == '/') {
+ struct http_uri_parser parser = http_uri_parser_init(uri);
+ uri = http_parse_path(&parser);
+ }
+
+ /* check URI size */
+ if (uri_auth->uri_len > uri.len)
+ return 0;
+
+ if (memcmp(uri.ptr, uri_auth->uri_prefix, uri_auth->uri_len) != 0)
+ return 0;
+
+ return 1;
+}
+
+/* This function prepares an applet to handle the stats. It can deal with the
+ * "100-continue" expectation, check that admin rules are met for POST requests,
+ * and program a response message if something was unexpected. It cannot fail
+ * and always relies on the stats applet to complete the job. It does not touch
+ * analysers nor counters, which are left to the caller. It does not touch
+ * s->target which is supposed to already point to the stats applet. The caller
+ * is expected to have already assigned an appctx to the stream.
+ */
+static int http_handle_stats(struct stream *s, struct channel *req)
+{
+ struct stats_admin_rule *stats_admin_rule;
+ struct session *sess = s->sess;
+ struct http_txn *txn = s->txn;
+ struct http_msg *msg = &txn->req;
+ struct uri_auth *uri_auth = s->be->uri_auth;
+ const char *h, *lookup, *end;
+ struct appctx *appctx = __sc_appctx(s->scb);
+ struct show_stat_ctx *ctx = applet_reserve_svcctx(appctx, sizeof(*ctx));
+ struct htx *htx;
+ struct htx_sl *sl;
+
+ appctx->st1 = 0;
+ ctx->state = STAT_STATE_INIT;
+ ctx->st_code = STAT_STATUS_INIT;
+ ctx->flags |= uri_auth->flags;
+ ctx->flags |= STAT_FMT_HTML; /* assume HTML mode by default */
+ if ((msg->flags & HTTP_MSGF_VER_11) && (txn->meth != HTTP_METH_HEAD))
+ ctx->flags |= STAT_CHUNKED;
+
+ htx = htxbuf(&req->buf);
+ sl = http_get_stline(htx);
+ lookup = HTX_SL_REQ_UPTR(sl) + uri_auth->uri_len;
+ end = HTX_SL_REQ_UPTR(sl) + HTX_SL_REQ_ULEN(sl);
+
+ for (h = lookup; h <= end - 3; h++) {
+ if (memcmp(h, ";up", 3) == 0) {
+ ctx->flags |= STAT_HIDE_DOWN;
+ break;
+ }
+ }
+
+ for (h = lookup; h <= end - 9; h++) {
+ if (memcmp(h, ";no-maint", 9) == 0) {
+ ctx->flags |= STAT_HIDE_MAINT;
+ break;
+ }
+ }
+
+ if (uri_auth->refresh) {
+ for (h = lookup; h <= end - 10; h++) {
+ if (memcmp(h, ";norefresh", 10) == 0) {
+ ctx->flags |= STAT_NO_REFRESH;
+ break;
+ }
+ }
+ }
+
+ for (h = lookup; h <= end - 4; h++) {
+ if (memcmp(h, ";csv", 4) == 0) {
+ ctx->flags &= ~(STAT_FMT_MASK|STAT_JSON_SCHM);
+ break;
+ }
+ }
+
+ for (h = lookup; h <= end - 6; h++) {
+ if (memcmp(h, ";typed", 6) == 0) {
+ ctx->flags &= ~(STAT_FMT_MASK|STAT_JSON_SCHM);
+ ctx->flags |= STAT_FMT_TYPED;
+ break;
+ }
+ }
+
+ for (h = lookup; h <= end - 5; h++) {
+ if (memcmp(h, ";json", 5) == 0) {
+ ctx->flags &= ~(STAT_FMT_MASK|STAT_JSON_SCHM);
+ ctx->flags |= STAT_FMT_JSON;
+ break;
+ }
+ }
+
+ for (h = lookup; h <= end - 12; h++) {
+ if (memcmp(h, ";json-schema", 12) == 0) {
+ ctx->flags &= ~STAT_FMT_MASK;
+ ctx->flags |= STAT_JSON_SCHM;
+ break;
+ }
+ }
+
+ for (h = lookup; h <= end - 8; h++) {
+ if (memcmp(h, ";st=", 4) == 0) {
+ int i;
+ h += 4;
+ ctx->st_code = STAT_STATUS_UNKN;
+ for (i = STAT_STATUS_INIT + 1; i < STAT_STATUS_SIZE; i++) {
+ if (strncmp(stat_status_codes[i], h, 4) == 0) {
+ ctx->st_code = i;
+ break;
+ }
+ }
+ break;
+ }
+ }
+
+ ctx->scope_str = 0;
+ ctx->scope_len = 0;
+ for (h = lookup; h <= end - 8; h++) {
+ if (memcmp(h, STAT_SCOPE_INPUT_NAME "=", strlen(STAT_SCOPE_INPUT_NAME) + 1) == 0) {
+ int itx = 0;
+ const char *h2;
+ char scope_txt[STAT_SCOPE_TXT_MAXLEN + 1];
+ const char *err;
+
+ h += strlen(STAT_SCOPE_INPUT_NAME) + 1;
+ h2 = h;
+ ctx->scope_str = h2 - HTX_SL_REQ_UPTR(sl);
+ while (h < end) {
+ if (*h == ';' || *h == '&' || *h == ' ')
+ break;
+ itx++;
+ h++;
+ }
+
+ if (itx > STAT_SCOPE_TXT_MAXLEN)
+ itx = STAT_SCOPE_TXT_MAXLEN;
+ ctx->scope_len = itx;
+
+ /* scope_txt = search query, ctx->scope_len is always <= STAT_SCOPE_TXT_MAXLEN */
+ memcpy(scope_txt, h2, itx);
+ scope_txt[itx] = '\0';
+ err = invalid_char(scope_txt);
+ if (err) {
+ /* bad char in search text => clear scope */
+ ctx->scope_str = 0;
+ ctx->scope_len = 0;
+ }
+ break;
+ }
+ }
+
+ /* now check whether we have some admin rules for this request */
+ list_for_each_entry(stats_admin_rule, &uri_auth->admin_rules, list) {
+ int ret = 1;
+
+ if (stats_admin_rule->cond) {
+ ret = acl_exec_cond(stats_admin_rule->cond, s->be, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);
+ ret = acl_pass(ret);
+ if (stats_admin_rule->cond->pol == ACL_COND_UNLESS)
+ ret = !ret;
+ }
+
+ if (ret) {
+ /* no rule, or the rule matches */
+ ctx->flags |= STAT_ADMIN;
+ break;
+ }
+ }
+
+ if (txn->meth == HTTP_METH_GET || txn->meth == HTTP_METH_HEAD)
+ appctx->st0 = STAT_HTTP_HEAD;
+ else if (txn->meth == HTTP_METH_POST) {
+ if (ctx->flags & STAT_ADMIN) {
+ appctx->st0 = STAT_HTTP_POST;
+ if (msg->msg_state < HTTP_MSG_DATA)
+ req->analysers |= AN_REQ_HTTP_BODY;
+ }
+ else {
+ /* POST without admin level */
+ ctx->flags &= ~STAT_CHUNKED;
+ ctx->st_code = STAT_STATUS_DENY;
+ appctx->st0 = STAT_HTTP_LAST;
+ }
+ }
+ else {
+ /* Unsupported method */
+ ctx->flags &= ~STAT_CHUNKED;
+ ctx->st_code = STAT_STATUS_IVAL;
+ appctx->st0 = STAT_HTTP_LAST;
+ }
+
+ s->task->nice = -32; /* small boost for HTTP statistics */
+ return 1;
+}
+
+/* This function waits for the message payload at most <time> milliseconds (may
+ * be set to TICK_ETERNITY). It stops to wait if at least <bytes> bytes of the
+ * payload are received (0 means no limit). It returns HTTP_RULE_* depending on
+ * the result:
+ *
+ * - HTTP_RULE_RES_CONT when conditions are met to stop waiting
+ * - HTTP_RULE_RES_YIELD to wait for more data
+ * - HTTP_RULE_RES_ABRT when a timeout occurred.
+ * - HTTP_RULE_RES_BADREQ if a parsing error is raised by lower level
+ * - HTTP_RULE_RES_ERROR if an internal error occurred
+ *
+ * If a timeout occurred, this function is responsible to emit the right response
+ * to the client, depending on the channel (408 on request side, 504 on response
+ * side). All other errors must be handled by the caller.
+ */
+enum rule_result http_wait_for_msg_body(struct stream *s, struct channel *chn,
+ unsigned int time, unsigned int bytes)
+{
+ struct session *sess = s->sess;
+ struct http_txn *txn = s->txn;
+ struct http_msg *msg = ((chn->flags & CF_ISRESP) ? &txn->rsp : &txn->req);
+ struct htx *htx;
+ enum rule_result ret = HTTP_RULE_RES_CONT;
+
+ htx = htxbuf(&chn->buf);
+
+ if (htx->flags & HTX_FL_PARSING_ERROR) {
+ ret = HTTP_RULE_RES_BADREQ;
+ goto end;
+ }
+ if (htx->flags & HTX_FL_PROCESSING_ERROR) {
+ ret = HTTP_RULE_RES_ERROR;
+ goto end;
+ }
+
+ /* Do nothing for bodyless and CONNECT requests */
+ if (txn->meth == HTTP_METH_CONNECT || (msg->flags & HTTP_MSGF_BODYLESS))
+ goto end;
+
+ if (!(chn->flags & CF_ISRESP) && msg->msg_state < HTTP_MSG_DATA) {
+ if (http_handle_expect_hdr(s, htx, msg) == -1) {
+ ret = HTTP_RULE_RES_ERROR;
+ goto end;
+ }
+ }
+
+ msg->msg_state = HTTP_MSG_DATA;
+
+ /* Now we're in HTTP_MSG_DATA. We just need to know if all data have
+ * been received or if the buffer is full.
+ */
+ if ((htx->flags & HTX_FL_EOM) ||
+ htx_get_tail_type(htx) > HTX_BLK_DATA ||
+ channel_htx_full(chn, htx, global.tune.maxrewrite) ||
+ sc_waiting_room(chn_prod(chn)))
+ goto end;
+
+ if (bytes) {
+ struct htx_blk *blk;
+ unsigned int len = 0;
+
+ for (blk = htx_get_first_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
+ if (htx_get_blk_type(blk) != HTX_BLK_DATA)
+ continue;
+ len += htx_get_blksz(blk);
+ if (len >= bytes)
+ goto end;
+ }
+ }
+
+ if ((chn->flags & CF_READ_TIMEOUT) || tick_is_expired(chn->analyse_exp, now_ms)) {
+ if (!(chn->flags & CF_ISRESP))
+ goto abort_req;
+ goto abort_res;
+ }
+
+ /* we get here if we need to wait for more data */
+ if (!(chn->flags & (CF_SHUTR | CF_READ_ERROR))) {
+ if (!tick_isset(chn->analyse_exp))
+ chn->analyse_exp = tick_add_ifset(now_ms, time);
+ ret = HTTP_RULE_RES_YIELD;
+ }
+
+ end:
+ return ret;
+
+ abort_req:
+ txn->status = 408;
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_CLITO;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_R;
+ _HA_ATOMIC_INC(&sess->fe->fe_counters.failed_req);
+ if (sess->listener && sess->listener->counters)
+ _HA_ATOMIC_INC(&sess->listener->counters->failed_req);
+ http_reply_and_close(s, txn->status, http_error_message(s));
+ ret = HTTP_RULE_RES_ABRT;
+ goto end;
+
+ abort_res:
+ txn->status = 504;
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_SRVTO;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_R;
+ stream_inc_http_fail_ctr(s);
+ http_reply_and_close(s, txn->status, http_error_message(s));
+ ret = HTTP_RULE_RES_ABRT;
+ goto end;
+}
+
+void http_perform_server_redirect(struct stream *s, struct stconn *sc)
+{
+ struct channel *req = &s->req;
+ struct channel *res = &s->res;
+ struct server *srv;
+ struct htx *htx;
+ struct htx_sl *sl;
+ struct ist path, location;
+ unsigned int flags;
+ struct http_uri_parser parser;
+
+ /*
+ * Create the location
+ */
+ chunk_reset(&trash);
+
+ /* 1: add the server's prefix */
+ /* special prefix "/" means don't change URL */
+ srv = __objt_server(s->target);
+ if (srv->rdr_len != 1 || *srv->rdr_pfx != '/') {
+ if (!chunk_memcat(&trash, srv->rdr_pfx, srv->rdr_len))
+ return;
+ }
+
+ /* 2: add the request Path */
+ htx = htxbuf(&req->buf);
+ sl = http_get_stline(htx);
+ parser = http_uri_parser_init(htx_sl_req_uri(sl));
+ path = http_parse_path(&parser);
+ if (!isttest(path))
+ return;
+
+ if (!chunk_memcat(&trash, path.ptr, path.len))
+ return;
+ location = ist2(trash.area, trash.data);
+
+ /*
+ * Create the 302 respone
+ */
+ htx = htx_from_buf(&res->buf);
+ flags = (HTX_SL_F_IS_RESP|HTX_SL_F_VER_11|HTX_SL_F_XFER_LEN|HTX_SL_F_BODYLESS);
+ sl = htx_add_stline(htx, HTX_BLK_RES_SL, flags,
+ ist("HTTP/1.1"), ist("302"), ist("Found"));
+ if (!sl)
+ goto fail;
+ sl->info.res.status = 302;
+ s->txn->status = 302;
+
+ if (!htx_add_header(htx, ist("Cache-Control"), ist("no-cache")) ||
+ !htx_add_header(htx, ist("Connection"), ist("close")) ||
+ !htx_add_header(htx, ist("Content-length"), ist("0")) ||
+ !htx_add_header(htx, ist("Location"), location))
+ goto fail;
+
+ if (!htx_add_endof(htx, HTX_BLK_EOH))
+ goto fail;
+
+ htx->flags |= HTX_FL_EOM;
+ htx_to_buf(htx, &res->buf);
+ if (!http_forward_proxy_resp(s, 1))
+ goto fail;
+
+ /* return without error. */
+ sc_shutr(sc);
+ sc_shutw(sc);
+ s->conn_err_type = STRM_ET_NONE;
+ sc->state = SC_ST_CLO;
+
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_LOCAL;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= SF_FINST_C;
+
+ /* FIXME: we should increase a counter of redirects per server and per backend. */
+ srv_inc_sess_ctr(srv);
+ srv_set_sess_last(srv);
+ return;
+
+ fail:
+ /* If an error occurred, remove the incomplete HTTP response from the
+ * buffer */
+ channel_htx_truncate(res, htx);
+}
+
+/* This function terminates the request because it was completely analyzed or
+ * because an error was triggered during the body forwarding.
+ */
+static void http_end_request(struct stream *s)
+{
+ struct channel *chn = &s->req;
+ struct http_txn *txn = s->txn;
+
+ DBG_TRACE_ENTER(STRM_EV_HTTP_ANA, s, txn);
+
+ if (unlikely(txn->req.msg_state == HTTP_MSG_ERROR ||
+ txn->rsp.msg_state == HTTP_MSG_ERROR)) {
+ channel_abort(chn);
+ channel_htx_truncate(chn, htxbuf(&chn->buf));
+ goto end;
+ }
+
+ if (unlikely(txn->req.msg_state < HTTP_MSG_DONE)) {
+ DBG_TRACE_DEVEL("waiting end of the request", STRM_EV_HTTP_ANA, s, txn);
+ return;
+ }
+
+ if (txn->req.msg_state == HTTP_MSG_DONE) {
+ /* No need to read anymore, the request was completely parsed.
+ * We can shut the read side unless we want to abort_on_close,
+ * or we have a POST request. The issue with POST requests is
+ * that some browsers still send a CRLF after the request, and
+ * this CRLF must be read so that it does not remain in the kernel
+ * buffers, otherwise a close could cause an RST on some systems
+ * (eg: Linux).
+ */
+ if (!(s->be->options & PR_O_ABRT_CLOSE) && txn->meth != HTTP_METH_POST)
+ channel_dont_read(chn);
+
+ /* if the server closes the connection, we want to immediately react
+ * and close the socket to save packets and syscalls.
+ */
+ s->scb->flags |= SC_FL_NOHALF;
+
+ /* In any case we've finished parsing the request so we must
+ * disable Nagle when sending data because 1) we're not going
+ * to shut this side, and 2) the server is waiting for us to
+ * send pending data.
+ */
+ chn->flags |= CF_NEVER_WAIT;
+
+ if (txn->rsp.msg_state < HTTP_MSG_DONE) {
+ /* The server has not finished to respond, so we
+ * don't want to move in order not to upset it.
+ */
+ DBG_TRACE_DEVEL("waiting end of the response", STRM_EV_HTTP_ANA, s, txn);
+ return;
+ }
+
+ /* When we get here, it means that both the request and the
+ * response have finished receiving. Depending on the connection
+ * mode, we'll have to wait for the last bytes to leave in either
+ * direction, and sometimes for a close to be effective.
+ */
+ if (txn->flags & TX_CON_WANT_TUN) {
+ /* Tunnel mode will not have any analyser so it needs to
+ * poll for reads.
+ */
+ channel_auto_read(chn);
+ txn->req.msg_state = HTTP_MSG_TUNNEL;
+ }
+ else {
+ /* we're not expecting any new data to come for this
+ * transaction, so we can close it.
+ *
+ * However, there is an exception if the response
+ * length is undefined. In this case, we need to wait
+ * the close from the server. The response will be
+ * switched in TUNNEL mode until the end.
+ */
+ if (!(txn->rsp.flags & HTTP_MSGF_XFER_LEN) &&
+ txn->rsp.msg_state != HTTP_MSG_CLOSED)
+ goto check_channel_flags;
+
+ if (!(chn->flags & (CF_SHUTW|CF_SHUTW_NOW))) {
+ channel_shutr_now(chn);
+ channel_shutw_now(chn);
+ }
+ }
+ goto check_channel_flags;
+ }
+
+ if (txn->req.msg_state == HTTP_MSG_CLOSING) {
+ http_msg_closing:
+ /* nothing else to forward, just waiting for the output buffer
+ * to be empty and for the shutw_now to take effect.
+ */
+ if (channel_is_empty(chn)) {
+ txn->req.msg_state = HTTP_MSG_CLOSED;
+ goto http_msg_closed;
+ }
+ else if (chn->flags & CF_SHUTW) {
+ txn->req.msg_state = HTTP_MSG_ERROR;
+ goto end;
+ }
+ DBG_TRACE_LEAVE(STRM_EV_HTTP_ANA, s, txn);
+ return;
+ }
+
+ if (txn->req.msg_state == HTTP_MSG_CLOSED) {
+ http_msg_closed:
+ /* if we don't know whether the server will close, we need to hard close */
+ if (txn->rsp.flags & HTTP_MSGF_XFER_LEN)
+ s->scb->flags |= SC_FL_NOLINGER; /* we want to close ASAP */
+ /* see above in MSG_DONE why we only do this in these states */
+ if (!(s->be->options & PR_O_ABRT_CLOSE))
+ channel_dont_read(chn);
+ goto end;
+ }
+
+ check_channel_flags:
+ /* Here, we are in HTTP_MSG_DONE or HTTP_MSG_TUNNEL */
+ if (chn->flags & (CF_SHUTW|CF_SHUTW_NOW)) {
+ /* if we've just closed an output, let's switch */
+ txn->req.msg_state = HTTP_MSG_CLOSING;
+ goto http_msg_closing;
+ }
+
+ end:
+ chn->analysers &= AN_REQ_FLT_END;
+ if (txn->req.msg_state == HTTP_MSG_TUNNEL) {
+ chn->flags |= CF_NEVER_WAIT;
+ if (HAS_REQ_DATA_FILTERS(s))
+ chn->analysers |= AN_REQ_FLT_XFER_DATA;
+ }
+ channel_auto_close(chn);
+ channel_auto_read(chn);
+ DBG_TRACE_LEAVE(STRM_EV_HTTP_ANA, s, txn);
+}
+
+
+/* This function terminates the response because it was completely analyzed or
+ * because an error was triggered during the body forwarding.
+ */
+static void http_end_response(struct stream *s)
+{
+ struct channel *chn = &s->res;
+ struct http_txn *txn = s->txn;
+
+ DBG_TRACE_ENTER(STRM_EV_HTTP_ANA, s, txn);
+
+ if (unlikely(txn->req.msg_state == HTTP_MSG_ERROR ||
+ txn->rsp.msg_state == HTTP_MSG_ERROR)) {
+ channel_htx_truncate(&s->req, htxbuf(&s->req.buf));
+ channel_abort(&s->req);
+ goto end;
+ }
+
+ if (unlikely(txn->rsp.msg_state < HTTP_MSG_DONE)) {
+ DBG_TRACE_DEVEL("waiting end of the response", STRM_EV_HTTP_ANA, s, txn);
+ return;
+ }
+
+ if (txn->rsp.msg_state == HTTP_MSG_DONE) {
+ /* In theory, we don't need to read anymore, but we must
+ * still monitor the server connection for a possible close
+ * while the request is being uploaded, so we don't disable
+ * reading.
+ */
+ /* channel_dont_read(chn); */
+
+ if (txn->req.msg_state < HTTP_MSG_DONE) {
+ /* The client seems to still be sending data, probably
+ * because we got an error response during an upload.
+ * We have the choice of either breaking the connection
+ * or letting it pass through. Let's do the later.
+ */
+ DBG_TRACE_DEVEL("waiting end of the request", STRM_EV_HTTP_ANA, s, txn);
+ return;
+ }
+
+ /* When we get here, it means that both the request and the
+ * response have finished receiving. Depending on the connection
+ * mode, we'll have to wait for the last bytes to leave in either
+ * direction, and sometimes for a close to be effective.
+ */
+ if (txn->flags & TX_CON_WANT_TUN) {
+ channel_auto_read(chn);
+ txn->rsp.msg_state = HTTP_MSG_TUNNEL;
+ }
+ else {
+ /* we're not expecting any new data to come for this
+ * transaction, so we can close it.
+ */
+ if (!(chn->flags & (CF_SHUTW|CF_SHUTW_NOW))) {
+ channel_shutr_now(chn);
+ channel_shutw_now(chn);
+ }
+ }
+ goto check_channel_flags;
+ }
+
+ if (txn->rsp.msg_state == HTTP_MSG_CLOSING) {
+ http_msg_closing:
+ /* nothing else to forward, just waiting for the output buffer
+ * to be empty and for the shutw_now to take effect.
+ */
+ if (channel_is_empty(chn)) {
+ txn->rsp.msg_state = HTTP_MSG_CLOSED;
+ goto http_msg_closed;
+ }
+ else if (chn->flags & CF_SHUTW) {
+ txn->rsp.msg_state = HTTP_MSG_ERROR;
+ _HA_ATOMIC_INC(&strm_sess(s)->fe->fe_counters.cli_aborts);
+ _HA_ATOMIC_INC(&s->be->be_counters.cli_aborts);
+ if (strm_sess(s)->listener && strm_sess(s)->listener->counters)
+ _HA_ATOMIC_INC(&strm_sess(s)->listener->counters->cli_aborts);
+ if (objt_server(s->target))
+ _HA_ATOMIC_INC(&__objt_server(s->target)->counters.cli_aborts);
+ goto end;
+ }
+ DBG_TRACE_LEAVE(STRM_EV_HTTP_ANA, s, txn);
+ return;
+ }
+
+ if (txn->rsp.msg_state == HTTP_MSG_CLOSED) {
+ http_msg_closed:
+ /* drop any pending data */
+ channel_htx_truncate(&s->req, htxbuf(&s->req.buf));
+ channel_abort(&s->req);
+ goto end;
+ }
+
+ check_channel_flags:
+ /* Here, we are in HTTP_MSG_DONE or HTTP_MSG_TUNNEL */
+ if (chn->flags & (CF_SHUTW|CF_SHUTW_NOW)) {
+ /* if we've just closed an output, let's switch */
+ txn->rsp.msg_state = HTTP_MSG_CLOSING;
+ goto http_msg_closing;
+ }
+
+ end:
+ chn->analysers &= AN_RES_FLT_END;
+ if (txn->rsp.msg_state == HTTP_MSG_TUNNEL) {
+ chn->flags |= CF_NEVER_WAIT;
+ if (HAS_RSP_DATA_FILTERS(s))
+ chn->analysers |= AN_RES_FLT_XFER_DATA;
+ }
+ channel_auto_close(chn);
+ channel_auto_read(chn);
+ DBG_TRACE_LEAVE(STRM_EV_HTTP_ANA, s, txn);
+}
+
+/* Forward a response generated by HAProxy (error/redirect/return). This
+ * function forwards all pending incoming data. If <final> is set to 0, nothing
+ * more is performed. It is used for 1xx informational messages. Otherwise, the
+ * transaction is terminated and the request is emptied. On success 1 is
+ * returned. If an error occurred, 0 is returned. If it fails, this function
+ * only exits. It is the caller responsibility to do the cleanup.
+ */
+int http_forward_proxy_resp(struct stream *s, int final)
+{
+ struct channel *req = &s->req;
+ struct channel *res = &s->res;
+ struct htx *htx = htxbuf(&res->buf);
+ size_t data;
+
+ if (final) {
+ htx->flags |= HTX_FL_PROXY_RESP;
+
+ if (!htx_is_empty(htx) && !http_eval_after_res_rules(s))
+ return 0;
+
+ if (s->txn->meth == HTTP_METH_HEAD)
+ htx_skip_msg_payload(htx);
+
+ channel_auto_read(req);
+ channel_abort(req);
+ channel_auto_close(req);
+ channel_htx_erase(req, htxbuf(&req->buf));
+
+ res->wex = tick_add_ifset(now_ms, res->wto);
+ channel_auto_read(res);
+ channel_auto_close(res);
+ channel_shutr_now(res);
+ res->flags |= CF_EOI; /* The response is terminated, add EOI */
+ htxbuf(&res->buf)->flags |= HTX_FL_EOM; /* no more data are expected */
+ }
+ else {
+ /* Send ASAP informational messages. Rely on CF_EOI for final
+ * response.
+ */
+ res->flags |= CF_SEND_DONTWAIT;
+ }
+
+ data = htx->data - co_data(res);
+ c_adv(res, data);
+ htx->first = -1;
+ res->total += data;
+ return 1;
+}
+
+void http_server_error(struct stream *s, struct stconn *sc, int err,
+ int finst, struct http_reply *msg)
+{
+ http_reply_and_close(s, s->txn->status, msg);
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= err;
+ if (!(s->flags & SF_FINST_MASK))
+ s->flags |= finst;
+}
+
+void http_reply_and_close(struct stream *s, short status, struct http_reply *msg)
+{
+ if (!msg) {
+ channel_htx_truncate(&s->res, htxbuf(&s->res.buf));
+ goto end;
+ }
+
+ if (http_reply_message(s, msg) == -1) {
+ /* On error, return a 500 error message, but don't rewrite it if
+ * it is already an internal error. If it was already a "const"
+ * 500 error, just fail.
+ */
+ if (s->txn->status == 500) {
+ if (s->txn->flags & TX_CONST_REPLY)
+ goto end;
+ s->txn->flags |= TX_CONST_REPLY;
+ }
+ s->txn->status = 500;
+ s->txn->http_reply = NULL;
+ return http_reply_and_close(s, s->txn->status, http_error_message(s));
+ }
+
+end:
+ s->res.wex = tick_add_ifset(now_ms, s->res.wto);
+
+ /* At this staged, HTTP analysis is finished */
+ s->req.analysers &= AN_REQ_FLT_END;
+ s->req.analyse_exp = TICK_ETERNITY;
+
+ s->res.analysers &= AN_RES_FLT_END;
+ s->res.analyse_exp = TICK_ETERNITY;
+
+ channel_auto_read(&s->req);
+ channel_abort(&s->req);
+ channel_auto_close(&s->req);
+ channel_htx_erase(&s->req, htxbuf(&s->req.buf));
+ channel_auto_read(&s->res);
+ channel_auto_close(&s->res);
+ channel_shutr_now(&s->res);
+}
+
+struct http_reply *http_error_message(struct stream *s)
+{
+ const int msgnum = http_get_status_idx(s->txn->status);
+
+ if (s->txn->http_reply)
+ return s->txn->http_reply;
+ else if (s->be->replies[msgnum])
+ return s->be->replies[msgnum];
+ else if (strm_fe(s)->replies[msgnum])
+ return strm_fe(s)->replies[msgnum];
+ else
+ return &http_err_replies[msgnum];
+}
+
+/* Produces an HTX message from an http reply. Depending on the http reply type,
+ * a, errorfile, an raw file or a log-format string is used. On success, it
+ * returns 0. If an error occurs -1 is returned. If it fails, this function only
+ * exits. It is the caller responsibility to do the cleanup.
+ */
+int http_reply_to_htx(struct stream *s, struct htx *htx, struct http_reply *reply)
+{
+ struct buffer *errmsg;
+ struct htx_sl *sl;
+ struct buffer *body = NULL;
+ const char *status, *reason, *clen, *ctype;
+ unsigned int slflags;
+ int ret = 0;
+
+ /*
+ * - HTTP_REPLY_ERRFILES unexpected here. handled as no payload if so
+ *
+ * - HTTP_REPLY_INDIRECT: switch on another reply if defined or handled
+ * as no payload if NULL. the TXN status code is set with the status
+ * of the original reply.
+ */
+
+ if (reply->type == HTTP_REPLY_INDIRECT) {
+ if (reply->body.reply)
+ reply = reply->body.reply;
+ }
+ if (reply->type == HTTP_REPLY_ERRMSG && !reply->body.errmsg) {
+ /* get default error message */
+ if (reply == s->txn->http_reply)
+ s->txn->http_reply = NULL;
+ reply = http_error_message(s);
+ if (reply->type == HTTP_REPLY_INDIRECT) {
+ if (reply->body.reply)
+ reply = reply->body.reply;
+ }
+ }
+
+ if (reply->type == HTTP_REPLY_ERRMSG) {
+ /* implicit or explicit error message*/
+ errmsg = reply->body.errmsg;
+ if (errmsg && !b_is_null(errmsg)) {
+ if (!htx_copy_msg(htx, errmsg))
+ goto fail;
+ }
+ }
+ else {
+ /* no payload, file or log-format string */
+ if (reply->type == HTTP_REPLY_RAW) {
+ /* file */
+ body = &reply->body.obj;
+ }
+ else if (reply->type == HTTP_REPLY_LOGFMT) {
+ /* log-format string */
+ body = alloc_trash_chunk();
+ if (!body)
+ goto fail_alloc;
+ body->data = build_logline(s, body->area, body->size, &reply->body.fmt);
+ }
+ /* else no payload */
+
+ status = ultoa(reply->status);
+ reason = http_get_reason(reply->status);
+ slflags = (HTX_SL_F_IS_RESP|HTX_SL_F_VER_11|HTX_SL_F_XFER_LEN|HTX_SL_F_CLEN);
+ if (!body || !b_data(body))
+ slflags |= HTX_SL_F_BODYLESS;
+ sl = htx_add_stline(htx, HTX_BLK_RES_SL, slflags, ist("HTTP/1.1"), ist(status), ist(reason));
+ if (!sl)
+ goto fail;
+ sl->info.res.status = reply->status;
+
+ clen = (body ? ultoa(b_data(body)) : "0");
+ ctype = reply->ctype;
+
+ if (!LIST_ISEMPTY(&reply->hdrs)) {
+ struct http_reply_hdr *hdr;
+ struct buffer *value = alloc_trash_chunk();
+
+ if (!value)
+ goto fail;
+
+ list_for_each_entry(hdr, &reply->hdrs, list) {
+ chunk_reset(value);
+ value->data = build_logline(s, value->area, value->size, &hdr->value);
+ if (b_data(value) && !htx_add_header(htx, hdr->name, ist2(b_head(value), b_data(value)))) {
+ free_trash_chunk(value);
+ goto fail;
+ }
+ chunk_reset(value);
+ }
+ free_trash_chunk(value);
+ }
+
+ if (!htx_add_header(htx, ist("content-length"), ist(clen)) ||
+ (body && b_data(body) && ctype && !htx_add_header(htx, ist("content-type"), ist(ctype))) ||
+ !htx_add_endof(htx, HTX_BLK_EOH) ||
+ (body && b_data(body) && !htx_add_data_atonce(htx, ist2(b_head(body), b_data(body)))))
+ goto fail;
+
+ htx->flags |= HTX_FL_EOM;
+ }
+
+ leave:
+ if (reply->type == HTTP_REPLY_LOGFMT)
+ free_trash_chunk(body);
+ return ret;
+
+ fail_alloc:
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_RESOURCE;
+ /* fall through */
+ fail:
+ ret = -1;
+ goto leave;
+}
+
+/* Send an http reply to the client. On success, it returns 0. If an error
+ * occurs -1 is returned and the response channel is truncated, removing this
+ * way the faulty reply. This function may fail when the reply is formatted
+ * (http_reply_to_htx) or when the reply is forwarded
+ * (http_forward_proxy_resp). On the last case, it is because a
+ * http-after-response rule fails.
+ */
+int http_reply_message(struct stream *s, struct http_reply *reply)
+{
+ struct channel *res = &s->res;
+ struct htx *htx = htx_from_buf(&res->buf);
+
+ if (s->txn->status == -1)
+ s->txn->status = reply->status;
+ channel_htx_truncate(res, htx);
+
+ if (http_reply_to_htx(s, htx, reply) == -1)
+ goto fail;
+
+ htx_to_buf(htx, &s->res.buf);
+ if (!http_forward_proxy_resp(s, 1))
+ goto fail;
+ return 0;
+
+ fail:
+ channel_htx_truncate(res, htx);
+ if (!(s->flags & SF_ERR_MASK))
+ s->flags |= SF_ERR_PRXCOND;
+ return -1;
+}
+
+/* Return the error message corresponding to s->conn_err_type. It is assumed
+ * that the server side is closed. Note that err_type is actually a
+ * bitmask, where almost only aborts may be cumulated with other
+ * values. We consider that aborted operations are more important
+ * than timeouts or errors due to the fact that nobody else in the
+ * logs might explain incomplete retries. All others should avoid
+ * being cumulated. It should normally not be possible to have multiple
+ * aborts at once, but just in case, the first one in sequence is reported.
+ * Note that connection errors appearing on the second request of a keep-alive
+ * connection are not reported since this allows the client to retry.
+ */
+void http_return_srv_error(struct stream *s, struct stconn *sc)
+{
+ int err_type = s->conn_err_type;
+
+ /* set s->txn->status for http_error_message(s) */
+ if (err_type & STRM_ET_QUEUE_ABRT) {
+ s->txn->status = -1;
+ http_server_error(s, sc, SF_ERR_CLICL, SF_FINST_Q, NULL);
+ }
+ else if (err_type & STRM_ET_CONN_ABRT) {
+ s->txn->status = -1;
+ http_server_error(s, sc, SF_ERR_CLICL, SF_FINST_C, NULL);
+ }
+ else if (err_type & STRM_ET_QUEUE_TO) {
+ s->txn->status = 503;
+ http_server_error(s, sc, SF_ERR_SRVTO, SF_FINST_Q,
+ http_error_message(s));
+ }
+ else if (err_type & STRM_ET_QUEUE_ERR) {
+ s->txn->status = 503;
+ http_server_error(s, sc, SF_ERR_SRVCL, SF_FINST_Q,
+ http_error_message(s));
+ }
+ else if (err_type & STRM_ET_CONN_TO) {
+ s->txn->status = 503;
+ http_server_error(s, sc, SF_ERR_SRVTO, SF_FINST_C,
+ (s->txn->flags & TX_NOT_FIRST) ? NULL :
+ http_error_message(s));
+ }
+ else if (err_type & STRM_ET_CONN_ERR) {
+ s->txn->status = 503;
+ http_server_error(s, sc, SF_ERR_SRVCL, SF_FINST_C,
+ (s->flags & SF_SRV_REUSED) ? NULL :
+ http_error_message(s));
+ }
+ else if (err_type & STRM_ET_CONN_RES) {
+ s->txn->status = 503;
+ http_server_error(s, sc, SF_ERR_RESOURCE, SF_FINST_C,
+ (s->txn->flags & TX_NOT_FIRST) ? NULL :
+ http_error_message(s));
+ }
+ else { /* STRM_ET_CONN_OTHER and others */
+ s->txn->status = 500;
+ http_server_error(s, sc, SF_ERR_INTERNAL, SF_FINST_C,
+ http_error_message(s));
+ }
+}
+
+
+/* Handle Expect: 100-continue for HTTP/1.1 messages if necessary. It returns 0
+ * on success and -1 on error.
+ */
+static int http_handle_expect_hdr(struct stream *s, struct htx *htx, struct http_msg *msg)
+{
+ /* If we have HTTP/1.1 message with a body and Expect: 100-continue,
+ * then we must send an HTTP/1.1 100 Continue intermediate response.
+ */
+ if (msg->msg_state == HTTP_MSG_BODY && (msg->flags & HTTP_MSGF_VER_11) &&
+ (msg->flags & (HTTP_MSGF_CNT_LEN|HTTP_MSGF_TE_CHNK))) {
+ struct ist hdr = { .ptr = "Expect", .len = 6 };
+ struct http_hdr_ctx ctx;
+
+ ctx.blk = NULL;
+ /* Expect is allowed in 1.1, look for it */
+ if (http_find_header(htx, hdr, &ctx, 0) &&
+ unlikely(isteqi(ctx.value, ist2("100-continue", 12)))) {
+ if (http_reply_100_continue(s) == -1)
+ return -1;
+ http_remove_header(htx, &ctx);
+ }
+ }
+ return 0;
+}
+
+/* Send a 100-Continue response to the client. It returns 0 on success and -1
+ * on error. The response channel is updated accordingly.
+ */
+static int http_reply_100_continue(struct stream *s)
+{
+ struct channel *res = &s->res;
+ struct htx *htx = htx_from_buf(&res->buf);
+ struct htx_sl *sl;
+ unsigned int flags = (HTX_SL_F_IS_RESP|HTX_SL_F_VER_11|
+ HTX_SL_F_XFER_LEN|HTX_SL_F_BODYLESS);
+
+ sl = htx_add_stline(htx, HTX_BLK_RES_SL, flags,
+ ist("HTTP/1.1"), ist("100"), ist("Continue"));
+ if (!sl)
+ goto fail;
+ sl->info.res.status = 100;
+
+ if (!htx_add_endof(htx, HTX_BLK_EOH))
+ goto fail;
+
+ if (!http_forward_proxy_resp(s, 0))
+ goto fail;
+ return 0;
+
+ fail:
+ /* If an error occurred, remove the incomplete HTTP response from the
+ * buffer */
+ channel_htx_truncate(res, htx);
+ return -1;
+}
+
+
+/*
+ * Capture headers from message <htx> according to header list <cap_hdr>, and
+ * fill the <cap> pointers appropriately.
+ */
+static void http_capture_headers(struct htx *htx, char **cap, struct cap_hdr *cap_hdr)
+{
+ struct cap_hdr *h;
+ int32_t pos;
+
+ for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
+ struct htx_blk *blk = htx_get_blk(htx, pos);
+ enum htx_blk_type type = htx_get_blk_type(blk);
+ struct ist n, v;
+
+ if (type == HTX_BLK_EOH)
+ break;
+ if (type != HTX_BLK_HDR)
+ continue;
+
+ n = htx_get_blk_name(htx, blk);
+
+ for (h = cap_hdr; h; h = h->next) {
+ if (h->namelen && (h->namelen == n.len) &&
+ (strncasecmp(n.ptr, h->name, h->namelen) == 0)) {
+ if (cap[h->index] == NULL)
+ cap[h->index] =
+ pool_alloc(h->pool);
+
+ if (cap[h->index] == NULL) {
+ ha_alert("HTTP capture : out of memory.\n");
+ break;
+ }
+
+ v = htx_get_blk_value(htx, blk);
+ v = isttrim(v, h->len);
+
+ memcpy(cap[h->index], v.ptr, v.len);
+ cap[h->index][v.len]=0;
+ }
+ }
+ }
+}
+
+/* Delete a value in a header between delimiters <from> and <next>. The header
+ * itself is delimited by <start> and <end> pointers. The number of characters
+ * displaced is returned, and the pointer to the first delimiter is updated if
+ * required. The function tries as much as possible to respect the following
+ * principles :
+ * - replace <from> delimiter by the <next> one unless <from> points to <start>,
+ * in which case <next> is simply removed
+ * - set exactly one space character after the new first delimiter, unless there
+ * are not enough characters in the block being moved to do so.
+ * - remove unneeded spaces before the previous delimiter and after the new
+ * one.
+ *
+ * It is the caller's responsibility to ensure that :
+ * - <from> points to a valid delimiter or <start> ;
+ * - <next> points to a valid delimiter or <end> ;
+ * - there are non-space chars before <from>.
+ */
+static int http_del_hdr_value(char *start, char *end, char **from, char *next)
+{
+ char *prev = *from;
+
+ if (prev == start) {
+ /* We're removing the first value. eat the semicolon, if <next>
+ * is lower than <end> */
+ if (next < end)
+ next++;
+
+ while (next < end && HTTP_IS_SPHT(*next))
+ next++;
+ }
+ else {
+ /* Remove useless spaces before the old delimiter. */
+ while (HTTP_IS_SPHT(*(prev-1)))
+ prev--;
+ *from = prev;
+
+ /* copy the delimiter and if possible a space if we're
+ * not at the end of the line.
+ */
+ if (next < end) {
+ *prev++ = *next++;
+ if (prev + 1 < next)
+ *prev++ = ' ';
+ while (next < end && HTTP_IS_SPHT(*next))
+ next++;
+ }
+ }
+ memmove(prev, next, end - next);
+ return (prev - next);
+}
+
+
+/* Formats the start line of the request (without CRLF) and puts it in <str> and
+ * return the written length. The line can be truncated if it exceeds <len>.
+ */
+static size_t http_fmt_req_line(const struct htx_sl *sl, char *str, size_t len)
+{
+ struct ist dst = ist2(str, 0);
+
+ if (istcat(&dst, htx_sl_req_meth(sl), len) == -1)
+ goto end;
+ if (dst.len + 1 > len)
+ goto end;
+ dst.ptr[dst.len++] = ' ';
+
+ if (istcat(&dst, htx_sl_req_uri(sl), len) == -1)
+ goto end;
+ if (dst.len + 1 > len)
+ goto end;
+ dst.ptr[dst.len++] = ' ';
+
+ istcat(&dst, htx_sl_req_vsn(sl), len);
+ end:
+ return dst.len;
+}
+
+/*
+ * Print a debug line with a start line.
+ */
+static void http_debug_stline(const char *dir, struct stream *s, const struct htx_sl *sl)
+{
+ struct session *sess = strm_sess(s);
+ int max;
+
+ chunk_printf(&trash, "%08x:%s.%s[%04x:%04x]: ", s->uniq_id, s->be->id,
+ dir,
+ objt_conn(sess->origin) ? (unsigned short)__objt_conn(sess->origin)->handle.fd : -1,
+ sc_conn(s->scb) ? (unsigned short)(__sc_conn(s->scb))->handle.fd : -1);
+
+ max = HTX_SL_P1_LEN(sl);
+ UBOUND(max, trash.size - trash.data - 3);
+ chunk_memcat(&trash, HTX_SL_P1_PTR(sl), max);
+ trash.area[trash.data++] = ' ';
+
+ max = HTX_SL_P2_LEN(sl);
+ UBOUND(max, trash.size - trash.data - 2);
+ chunk_memcat(&trash, HTX_SL_P2_PTR(sl), max);
+ trash.area[trash.data++] = ' ';
+
+ max = HTX_SL_P3_LEN(sl);
+ UBOUND(max, trash.size - trash.data - 1);
+ chunk_memcat(&trash, HTX_SL_P3_PTR(sl), max);
+ trash.area[trash.data++] = '\n';
+
+ DISGUISE(write(1, trash.area, trash.data));
+}
+
+/*
+ * Print a debug line with a header.
+ */
+static void http_debug_hdr(const char *dir, struct stream *s, const struct ist n, const struct ist v)
+{
+ struct session *sess = strm_sess(s);
+ int max;
+
+ chunk_printf(&trash, "%08x:%s.%s[%04x:%04x]: ", s->uniq_id, s->be->id,
+ dir,
+ objt_conn(sess->origin) ? (unsigned short)__objt_conn(sess->origin)->handle.fd : -1,
+ sc_conn(s->scb) ? (unsigned short)(__sc_conn(s->scb))->handle.fd : -1);
+
+ max = n.len;
+ UBOUND(max, trash.size - trash.data - 3);
+ chunk_memcat(&trash, n.ptr, max);
+ trash.area[trash.data++] = ':';
+ trash.area[trash.data++] = ' ';
+
+ max = v.len;
+ UBOUND(max, trash.size - trash.data - 1);
+ chunk_memcat(&trash, v.ptr, max);
+ trash.area[trash.data++] = '\n';
+
+ DISGUISE(write(1, trash.area, trash.data));
+}
+
+void http_txn_reset_req(struct http_txn *txn)
+{
+ txn->req.flags = 0;
+ txn->req.msg_state = HTTP_MSG_RQBEFORE; /* at the very beginning of the request */
+}
+
+void http_txn_reset_res(struct http_txn *txn)
+{
+ txn->rsp.flags = 0;
+ txn->rsp.msg_state = HTTP_MSG_RPBEFORE; /* at the very beginning of the response */
+}
+
+/*
+ * Create and initialize a new HTTP transaction for stream <s>. This should be
+ * used before processing any new request. It returns the transaction or NLULL
+ * on error.
+ */
+struct http_txn *http_create_txn(struct stream *s)
+{
+ struct http_txn *txn;
+ struct stconn *sc = s->scf;
+
+ txn = pool_alloc(pool_head_http_txn);
+ if (!txn)
+ return NULL;
+ s->txn = txn;
+
+ txn->meth = HTTP_METH_OTHER;
+ txn->flags = ((sc && sc_ep_test(sc, SE_FL_NOT_FIRST)) ? TX_NOT_FIRST : 0);
+ txn->status = -1;
+ txn->http_reply = NULL;
+ txn->l7_buffer = BUF_NULL;
+ write_u32(txn->cache_hash, 0);
+
+ txn->cookie_first_date = 0;
+ txn->cookie_last_date = 0;
+
+ txn->srv_cookie = NULL;
+ txn->cli_cookie = NULL;
+ txn->uri = NULL;
+
+ http_txn_reset_req(txn);
+ http_txn_reset_res(txn);
+
+ txn->req.chn = &s->req;
+ txn->rsp.chn = &s->res;
+
+ txn->auth.method = HTTP_AUTH_UNKNOWN;
+
+ /* here we don't want to re-initialize s->vars_txn and s->vars_reqres
+ * variable lists, because they were already initialized upon stream
+ * creation in stream_new(), and thus may already contain some variables
+ */
+
+ return txn;
+}
+
+/* to be used at the end of a transaction */
+void http_destroy_txn(struct stream *s)
+{
+ struct http_txn *txn = s->txn;
+
+ /* these ones will have been dynamically allocated */
+ pool_free(pool_head_requri, txn->uri);
+ pool_free(pool_head_capture, txn->cli_cookie);
+ pool_free(pool_head_capture, txn->srv_cookie);
+ pool_free(pool_head_uniqueid, s->unique_id.ptr);
+
+ s->unique_id = IST_NULL;
+ txn->uri = NULL;
+ txn->srv_cookie = NULL;
+ txn->cli_cookie = NULL;
+
+ if (!LIST_ISEMPTY(&s->vars_txn.head))
+ vars_prune(&s->vars_txn, s->sess, s);
+ if (!LIST_ISEMPTY(&s->vars_reqres.head))
+ vars_prune(&s->vars_reqres, s->sess, s);
+
+ b_free(&txn->l7_buffer);
+
+ pool_free(pool_head_http_txn, txn);
+ s->txn = NULL;
+}
+
+
+DECLARE_POOL(pool_head_http_txn, "http_txn", sizeof(struct http_txn));
+
+/*
+ * Local variables:
+ * c-indent-level: 8
+ * c-basic-offset: 8
+ * End:
+ */