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http_act.c
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/*
* HTTP actions
*
* Copyright 2000-2018 Willy Tarreau <w@1wt.eu>
*
* 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 <sys/types.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <haproxy/acl.h>
#include <haproxy/action.h>
#include <haproxy/api.h>
#include <haproxy/arg.h>
#include <haproxy/capture-t.h>
#include <haproxy/cfgparse.h>
#include <haproxy/chunk.h>
#include <haproxy/global.h>
#include <haproxy/http.h>
#include <haproxy/http_ana.h>
#include <haproxy/http_htx.h>
#include <haproxy/http_rules.h>
#include <haproxy/log.h>
#include <haproxy/pattern.h>
#include <haproxy/pool.h>
#include <haproxy/regex.h>
#include <haproxy/sample.h>
#include <haproxy/sc_strm.h>
#include <haproxy/stconn.h>
#include <haproxy/tools.h>
#include <haproxy/uri_auth-t.h>
#include <haproxy/uri_normalizer.h>
#include <haproxy/version.h>
/* Release memory allocated by most of HTTP actions. Concretly, it releases
* <arg.http>.
*/
static void release_http_action(struct act_rule *rule)
{
istfree(&rule->arg.http.str);
if (rule->arg.http.re)
regex_free(rule->arg.http.re);
lf_expr_deinit(&rule->arg.http.fmt);
}
/* Release memory allocated by HTTP actions relying on an http reply. Concretly,
* it releases <.arg.http_reply>
*/
static void release_act_http_reply(struct act_rule *rule)
{
release_http_reply(rule->arg.http_reply);
rule->arg.http_reply = NULL;
}
/* Check function for HTTP actions relying on an http reply. The function
* returns 1 in success case, otherwise, it returns 0 and err is filled.
*/
static int check_act_http_reply(struct act_rule *rule, struct proxy *px, char **err)
{
struct http_reply *reply = rule->arg.http_reply;
if (!http_check_http_reply(reply, px, err)) {
release_act_http_reply(rule);
return 0;
}
return 1;
}
/* This function executes one of the set-{method,path,query,uri} actions. It
* builds a string in the trash from the specified format string. It finds
* the action to be performed in <.action>, previously filled by function
* parse_set_req_line(). The replacement action is executed by the function
* http_action_set_req_line(). On success, it returns ACT_RET_CONT. If an error
* occurs while soft rewrites are enabled, the action is canceled, but the rule
* processing continue. Otherwsize ACT_RET_ERR is returned.
*/
static enum act_return http_action_set_req_line(struct act_rule *rule, struct proxy *px,
struct session *sess, struct stream *s, int flags)
{
struct buffer *replace;
enum act_return ret = ACT_RET_CONT;
replace = alloc_trash_chunk();
if (!replace)
goto fail_alloc;
/* If we have to create a query string, prepare a '?'. */
if (rule->action == 2) // set-query
replace->area[replace->data++] = '?';
replace->data += build_logline(s, replace->area + replace->data,
replace->size - replace->data,
&rule->arg.http.fmt);
if (http_req_replace_stline(rule->action, replace->area, replace->data, px, s) == -1)
goto fail_rewrite;
leave:
free_trash_chunk(replace);
return ret;
fail_alloc:
if (!(s->flags & SF_ERR_MASK))
s->flags |= SF_ERR_RESOURCE;
ret = ACT_RET_ERR;
goto leave;
fail_rewrite:
_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);
if (!(s->txn->req.flags & HTTP_MSGF_SOFT_RW)) {
ret = ACT_RET_ERR;
if (!(s->flags & SF_ERR_MASK))
s->flags |= SF_ERR_PRXCOND;
}
goto leave;
}
/* parse an http-request action among :
* set-method
* set-path
* set-pathq
* set-query
* set-uri
*
* All of them accept a single argument of type string representing a log-format.
* The resulting rule makes use of <http.fmt> to store the log-format list head,
* and <.action> to store the action type as an int (0=method, 1=path, 2=query,
* 3=uri). It returns ACT_RET_PRS_OK on success, ACT_RET_PRS_ERR on error.
*/
static enum act_parse_ret parse_set_req_line(const char **args, int *orig_arg, struct proxy *px,
struct act_rule *rule, char **err)
{
int cur_arg = *orig_arg;
int cap = 0;
switch (args[0][4]) {
case 'm' :
rule->action = 0; // set-method
break;
case 'p' :
if (args[0][8] == 'q')
rule->action = 4; // set-pathq
else
rule->action = 1; // set-path
break;
case 'q' :
rule->action = 2; // set-query
break;
case 'u' :
rule->action = 3; // set-uri
break;
default:
memprintf(err, "internal error: unhandled action '%s'", args[0]);
return ACT_RET_PRS_ERR;
}
rule->action_ptr = http_action_set_req_line;
rule->release_ptr = release_http_action;
lf_expr_init(&rule->arg.http.fmt);
if (!*args[cur_arg] ||
(*args[cur_arg + 1] && strcmp(args[cur_arg + 1], "if") != 0 && strcmp(args[cur_arg + 1], "unless") != 0)) {
memprintf(err, "expects exactly 1 argument <format>");
return ACT_RET_PRS_ERR;
}
px->conf.args.ctx = ARGC_HRQ;
if (px->cap & PR_CAP_FE)
cap |= SMP_VAL_FE_HRQ_HDR;
if (px->cap & PR_CAP_BE)
cap |= SMP_VAL_BE_HRQ_HDR;
if (!parse_logformat_string(args[cur_arg], px, &rule->arg.http.fmt, LOG_OPT_HTTP, cap, err)) {
return ACT_RET_PRS_ERR;
}
(*orig_arg)++;
return ACT_RET_PRS_OK;
}
/* This function executes the http-request normalize-uri action.
* `rule->action` is expected to be a value from `enum act_normalize_uri`.
*
* On success, it returns ACT_RET_CONT. If an error
* occurs while soft rewrites are enabled, the action is canceled, but the rule
* processing continue. Otherwsize ACT_RET_ERR is returned.
*/
static enum act_return http_action_normalize_uri(struct act_rule *rule, struct proxy *px,
struct session *sess, struct stream *s, int flags)
{
enum act_return ret = ACT_RET_CONT;
struct htx *htx = htxbuf(&s->req.buf);
const struct ist uri = htx_sl_req_uri(http_get_stline(htx));
struct buffer *replace = alloc_trash_chunk();
enum uri_normalizer_err err = URI_NORMALIZER_ERR_INTERNAL_ERROR;
if (!replace)
goto fail_alloc;
switch ((enum act_normalize_uri) rule->action) {
case ACT_NORMALIZE_URI_PATH_MERGE_SLASHES: {
struct http_uri_parser parser = http_uri_parser_init(uri);
const struct ist path = http_parse_path(&parser);
struct ist newpath = ist2(replace->area, replace->size);
if (!isttest(path))
goto leave;
err = uri_normalizer_path_merge_slashes(iststop(path, '?'), &newpath);
if (err != URI_NORMALIZER_ERR_NONE)
break;
if (!http_replace_req_path(htx, newpath, 0))
goto fail_rewrite;
break;
}
case ACT_NORMALIZE_URI_PATH_STRIP_DOT: {
struct http_uri_parser parser = http_uri_parser_init(uri);
const struct ist path = http_parse_path(&parser);
struct ist newpath = ist2(replace->area, replace->size);
if (!isttest(path))
goto leave;
err = uri_normalizer_path_dot(iststop(path, '?'), &newpath);
if (err != URI_NORMALIZER_ERR_NONE)
break;
if (!http_replace_req_path(htx, newpath, 0))
goto fail_rewrite;
break;
}
case ACT_NORMALIZE_URI_PATH_STRIP_DOTDOT:
case ACT_NORMALIZE_URI_PATH_STRIP_DOTDOT_FULL: {
struct http_uri_parser parser = http_uri_parser_init(uri);
const struct ist path = http_parse_path(&parser);
struct ist newpath = ist2(replace->area, replace->size);
if (!isttest(path))
goto leave;
err = uri_normalizer_path_dotdot(iststop(path, '?'), rule->action == ACT_NORMALIZE_URI_PATH_STRIP_DOTDOT_FULL, &newpath);
if (err != URI_NORMALIZER_ERR_NONE)
break;
if (!http_replace_req_path(htx, newpath, 0))
goto fail_rewrite;
break;
}
case ACT_NORMALIZE_URI_QUERY_SORT_BY_NAME: {
struct http_uri_parser parser = http_uri_parser_init(uri);
const struct ist path = http_parse_path(&parser);
struct ist newquery = ist2(replace->area, replace->size);
if (!isttest(path))
goto leave;
err = uri_normalizer_query_sort(istfind(path, '?'), '&', &newquery);
if (err != URI_NORMALIZER_ERR_NONE)
break;
if (!http_replace_req_query(htx, newquery))
goto fail_rewrite;
break;
}
case ACT_NORMALIZE_URI_PERCENT_TO_UPPERCASE:
case ACT_NORMALIZE_URI_PERCENT_TO_UPPERCASE_STRICT: {
struct http_uri_parser parser = http_uri_parser_init(uri);
const struct ist path = http_parse_path(&parser);
struct ist newpath = ist2(replace->area, replace->size);
if (!isttest(path))
goto leave;
err = uri_normalizer_percent_upper(path, rule->action == ACT_NORMALIZE_URI_PERCENT_TO_UPPERCASE_STRICT, &newpath);
if (err != URI_NORMALIZER_ERR_NONE)
break;
if (!http_replace_req_path(htx, newpath, 1))
goto fail_rewrite;
break;
}
case ACT_NORMALIZE_URI_PERCENT_DECODE_UNRESERVED:
case ACT_NORMALIZE_URI_PERCENT_DECODE_UNRESERVED_STRICT: {
struct http_uri_parser parser = http_uri_parser_init(uri);
const struct ist path = http_parse_path(&parser);
struct ist newpath = ist2(replace->area, replace->size);
if (!isttest(path))
goto leave;
err = uri_normalizer_percent_decode_unreserved(path, rule->action == ACT_NORMALIZE_URI_PERCENT_DECODE_UNRESERVED_STRICT, &newpath);
if (err != URI_NORMALIZER_ERR_NONE)
break;
if (!http_replace_req_path(htx, newpath, 1))
goto fail_rewrite;
break;
}
case ACT_NORMALIZE_URI_FRAGMENT_STRIP: {
struct http_uri_parser parser = http_uri_parser_init(uri);
const struct ist path = http_parse_path(&parser);
struct ist newpath = ist2(replace->area, replace->size);
if (!isttest(path))
goto leave;
err = uri_normalizer_fragment_strip(path, &newpath);
if (err != URI_NORMALIZER_ERR_NONE)
break;
if (!http_replace_req_path(htx, newpath, 1))
goto fail_rewrite;
break;
}
case ACT_NORMALIZE_URI_FRAGMENT_ENCODE: {
struct http_uri_parser parser = http_uri_parser_init(uri);
const struct ist path = http_parse_path(&parser);
struct ist newpath = ist2(replace->area, replace->size);
if (!isttest(path))
goto leave;
err = uri_normalizer_fragment_encode(path, &newpath);
if (err != URI_NORMALIZER_ERR_NONE)
break;
if (!http_replace_req_path(htx, newpath, 1))
goto fail_rewrite;
break;
}
}
switch (err) {
case URI_NORMALIZER_ERR_NONE:
break;
case URI_NORMALIZER_ERR_INTERNAL_ERROR:
ret = ACT_RET_ERR;
break;
case URI_NORMALIZER_ERR_INVALID_INPUT:
ret = ACT_RET_INV;
break;
case URI_NORMALIZER_ERR_ALLOC:
goto fail_alloc;
}
leave:
free_trash_chunk(replace);
return ret;
fail_alloc:
if (!(s->flags & SF_ERR_MASK))
s->flags |= SF_ERR_RESOURCE;
ret = ACT_RET_ERR;
goto leave;
fail_rewrite:
_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_rewrites, 1);
if (s->flags & SF_BE_ASSIGNED)
_HA_ATOMIC_ADD(&s->be->be_counters.failed_rewrites, 1);
if (sess->listener && sess->listener->counters)
_HA_ATOMIC_ADD(&sess->listener->counters->failed_rewrites, 1);
if (objt_server(s->target))
_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.failed_rewrites, 1);
if (!(s->txn->req.flags & HTTP_MSGF_SOFT_RW)) {
ret = ACT_RET_ERR;
if (!(s->flags & SF_ERR_MASK))
s->flags |= SF_ERR_PRXCOND;
}
goto leave;
}
/* Parses the http-request normalize-uri action. It expects a single <normalizer>
* argument, corresponding too a value in `enum act_normalize_uri`.
*
* It returns ACT_RET_PRS_OK on success, ACT_RET_PRS_ERR on error.
*/
static enum act_parse_ret parse_http_normalize_uri(const char **args, int *orig_arg, struct proxy *px,
struct act_rule *rule, char **err)
{
int cur_arg = *orig_arg;
rule->action_ptr = http_action_normalize_uri;
rule->release_ptr = NULL;
if (!*args[cur_arg]) {
memprintf(err, "missing argument <normalizer>");
return ACT_RET_PRS_ERR;
}
if (strcmp(args[cur_arg], "path-merge-slashes") == 0) {
cur_arg++;
rule->action = ACT_NORMALIZE_URI_PATH_MERGE_SLASHES;
}
else if (strcmp(args[cur_arg], "path-strip-dot") == 0) {
cur_arg++;
rule->action = ACT_NORMALIZE_URI_PATH_STRIP_DOT;
}
else if (strcmp(args[cur_arg], "path-strip-dotdot") == 0) {
cur_arg++;
if (strcmp(args[cur_arg], "full") == 0) {
cur_arg++;
rule->action = ACT_NORMALIZE_URI_PATH_STRIP_DOTDOT_FULL;
}
else if (!*args[cur_arg]) {
rule->action = ACT_NORMALIZE_URI_PATH_STRIP_DOTDOT;
}
else if (strcmp(args[cur_arg], "if") != 0 && strcmp(args[cur_arg], "unless") != 0) {
memprintf(err, "unknown argument '%s' for 'path-strip-dotdot' normalizer", args[cur_arg]);
return ACT_RET_PRS_ERR;
}
}
else if (strcmp(args[cur_arg], "query-sort-by-name") == 0) {
cur_arg++;
rule->action = ACT_NORMALIZE_URI_QUERY_SORT_BY_NAME;
}
else if (strcmp(args[cur_arg], "percent-to-uppercase") == 0) {
cur_arg++;
if (strcmp(args[cur_arg], "strict") == 0) {
cur_arg++;
rule->action = ACT_NORMALIZE_URI_PERCENT_TO_UPPERCASE_STRICT;
}
else if (!*args[cur_arg]) {
rule->action = ACT_NORMALIZE_URI_PERCENT_TO_UPPERCASE;
}
else if (strcmp(args[cur_arg], "if") != 0 && strcmp(args[cur_arg], "unless") != 0) {
memprintf(err, "unknown argument '%s' for 'percent-to-uppercase' normalizer", args[cur_arg]);
return ACT_RET_PRS_ERR;
}
}
else if (strcmp(args[cur_arg], "percent-decode-unreserved") == 0) {
cur_arg++;
if (strcmp(args[cur_arg], "strict") == 0) {
cur_arg++;
rule->action = ACT_NORMALIZE_URI_PERCENT_DECODE_UNRESERVED_STRICT;
}
else if (!*args[cur_arg]) {
rule->action = ACT_NORMALIZE_URI_PERCENT_DECODE_UNRESERVED;
}
else if (strcmp(args[cur_arg], "if") != 0 && strcmp(args[cur_arg], "unless") != 0) {
memprintf(err, "unknown argument '%s' for 'percent-decode-unreserved' normalizer", args[cur_arg]);
return ACT_RET_PRS_ERR;
}
}
else if (strcmp(args[cur_arg], "fragment-strip") == 0) {
cur_arg++;
rule->action = ACT_NORMALIZE_URI_FRAGMENT_STRIP;
}
else if (strcmp(args[cur_arg], "fragment-encode") == 0) {
cur_arg++;
rule->action = ACT_NORMALIZE_URI_FRAGMENT_ENCODE;
}
else {
memprintf(err, "unknown normalizer '%s'", args[cur_arg]);
return ACT_RET_PRS_ERR;
}
*orig_arg = cur_arg;
return ACT_RET_PRS_OK;
}
/* This function executes a replace-uri action. It finds its arguments in
* <rule>.arg.http. It builds a string in the trash from the format string
* previously filled by function parse_replace_uri() and will execute the regex
* in <http.re> to replace the URI. It uses the format string present in
* <http.fmt>. The component to act on (path/uri) is taken from <.action> which
* contains 1 for the path or 3 for the URI (values used by
* http_req_replace_stline()). On success, it returns ACT_RET_CONT. If an error
* occurs while soft rewrites are enabled, the action is canceled, but the rule
* processing continue. Otherwsize ACT_RET_ERR is returned.
*/
static enum act_return http_action_replace_uri(struct act_rule *rule, struct proxy *px,
struct session *sess, struct stream *s, int flags)
{
enum act_return ret = ACT_RET_CONT;
struct buffer *replace, *output;
struct ist uri;
int len;
replace = alloc_trash_chunk();
output = alloc_trash_chunk();
if (!replace || !output)
goto fail_alloc;
uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
if (rule->action == 1) { // replace-path
struct http_uri_parser parser = http_uri_parser_init(uri);
uri = iststop(http_parse_path(&parser), '?');
}
else if (rule->action == 4) { // replace-pathq
struct http_uri_parser parser = http_uri_parser_init(uri);
uri = http_parse_path(&parser);
}
if (!istlen(uri))
goto leave;
if (!regex_exec_match2(rule->arg.http.re, uri.ptr, uri.len, MAX_MATCH, pmatch, 0))
goto leave;
replace->data = build_logline(s, replace->area, replace->size, &rule->arg.http.fmt);
/* note: uri.ptr doesn't need to be zero-terminated because it will
* only be used to pick pmatch references.
*/
len = exp_replace(output->area, output->size, uri.ptr, replace->area, pmatch);
if (len == -1)
goto fail_rewrite;
if (http_req_replace_stline(rule->action, output->area, len, px, s) == -1)
goto fail_rewrite;
leave:
free_trash_chunk(output);
free_trash_chunk(replace);
return ret;
fail_alloc:
if (!(s->flags & SF_ERR_MASK))
s->flags |= SF_ERR_RESOURCE;
ret = ACT_RET_ERR;
goto leave;
fail_rewrite:
_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);
if (!(s->txn->req.flags & HTTP_MSGF_SOFT_RW)) {
ret = ACT_RET_ERR;
if (!(s->flags & SF_ERR_MASK))
s->flags |= SF_ERR_PRXCOND;
}
goto leave;
}
/* parse a "replace-uri", "replace-path" or "replace-pathq"
* http-request action.
* This action takes 2 arguments (a regex and a replacement format string).
* The resulting rule makes use of <.action> to store the action (1/3 for now),
* <http.re> to store the compiled regex, and <http.fmt> to store the log-format
* list head. It returns ACT_RET_PRS_OK on success, ACT_RET_PRS_ERR on error.
*/
static enum act_parse_ret parse_replace_uri(const char **args, int *orig_arg, struct proxy *px,
struct act_rule *rule, char **err)
{
int cur_arg = *orig_arg;
int cap = 0;
char *error = NULL;
switch (args[0][8]) {
case 'p':
if (args[0][12] == 'q')
rule->action = 4; // replace-pathq, same as set-pathq
else
rule->action = 1; // replace-path, same as set-path
break;
case 'u':
rule->action = 3; // replace-uri, same as set-uri
break;
default:
memprintf(err, "internal error: unhandled action '%s'", args[0]);
return ACT_RET_PRS_ERR;
}
rule->action_ptr = http_action_replace_uri;
rule->release_ptr = release_http_action;
lf_expr_init(&rule->arg.http.fmt);
if (!*args[cur_arg] || !*args[cur_arg+1] ||
(*args[cur_arg+2] && strcmp(args[cur_arg+2], "if") != 0 && strcmp(args[cur_arg+2], "unless") != 0)) {
memprintf(err, "expects exactly 2 arguments <match-regex> and <replace-format>");
return ACT_RET_PRS_ERR;
}
if (!(rule->arg.http.re = regex_comp(args[cur_arg], 1, 1, &error))) {
memprintf(err, "failed to parse the regex : %s", error);
free(error);
return ACT_RET_PRS_ERR;
}
px->conf.args.ctx = ARGC_HRQ;
if (px->cap & PR_CAP_FE)
cap |= SMP_VAL_FE_HRQ_HDR;
if (px->cap & PR_CAP_BE)
cap |= SMP_VAL_BE_HRQ_HDR;
if (!parse_logformat_string(args[cur_arg + 1], px, &rule->arg.http.fmt, LOG_OPT_HTTP, cap, err)) {
regex_free(rule->arg.http.re);
return ACT_RET_PRS_ERR;
}
(*orig_arg) += 2;
return ACT_RET_PRS_OK;
}
/* This function is just a compliant action wrapper for "set-status". */
static enum act_return action_http_set_status(struct act_rule *rule, struct proxy *px,
struct session *sess, struct stream *s, int flags)
{
if (http_res_set_status(rule->arg.http.i, rule->arg.http.str, s) == -1) {
_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);
if (!(s->txn->req.flags & HTTP_MSGF_SOFT_RW)) {
if (!(s->flags & SF_ERR_MASK))
s->flags |= SF_ERR_PRXCOND;
return ACT_RET_ERR;
}
}
return ACT_RET_CONT;
}
/* parse set-status action:
* This action accepts a single argument of type int representing
* an http status code. It returns ACT_RET_PRS_OK on success,
* ACT_RET_PRS_ERR on error.
*/
static enum act_parse_ret parse_http_set_status(const char **args, int *orig_arg, struct proxy *px,
struct act_rule *rule, char **err)
{
char *error;
rule->action = ACT_CUSTOM;
rule->action_ptr = action_http_set_status;
rule->release_ptr = release_http_action;
lf_expr_init(&rule->arg.http.fmt);
/* Check if an argument is available */
if (!*args[*orig_arg]) {
memprintf(err, "expects 1 argument: <status>; or 3 arguments: <status> reason <fmt>");
return ACT_RET_PRS_ERR;
}
/* convert status code as integer */
rule->arg.http.i = strtol(args[*orig_arg], &error, 10);
if (*error != '\0' || rule->arg.http.i < 100 || rule->arg.http.i > 999) {
memprintf(err, "expects an integer status code between 100 and 999");
return ACT_RET_PRS_ERR;
}
(*orig_arg)++;
/* set custom reason string */
rule->arg.http.str = ist(NULL); // If null, we use the default reason for the status code.
if (*args[*orig_arg] && strcmp(args[*orig_arg], "reason") == 0 &&
(*args[*orig_arg + 1] && strcmp(args[*orig_arg + 1], "if") != 0 && strcmp(args[*orig_arg + 1], "unless") != 0)) {
(*orig_arg)++;
rule->arg.http.str = ist(strdup(args[*orig_arg]));
(*orig_arg)++;
}
return ACT_RET_PRS_OK;
}
/* This function executes the "reject" HTTP action. It clears the request and
* response buffer without sending any response. It can be useful as an HTTP
* alternative to the silent-drop action to defend against DoS attacks, and may
* also be used with HTTP/2 to close a connection instead of just a stream.
* The txn status is unchanged, indicating no response was sent. The termination
* flags will indicate "PR". It always returns ACT_RET_ABRT.
*/
static enum act_return http_action_reject(struct act_rule *rule, struct proxy *px,
struct session *sess, struct stream *s, int flags)
{
sc_must_kill_conn(s->scf);
stream_abort(s);
s->req.analysers &= AN_REQ_FLT_END;
s->res.analysers &= AN_RES_FLT_END;
_HA_ATOMIC_INC(&s->be->be_counters.denied_req);
_HA_ATOMIC_INC(&sess->fe->fe_counters.denied_req);
if (sess->listener && sess->listener->counters)
_HA_ATOMIC_INC(&sess->listener->counters->denied_req);
if (!(s->flags & SF_ERR_MASK))
s->flags |= SF_ERR_PRXCOND;
if (!(s->flags & SF_FINST_MASK))
s->flags |= SF_FINST_R;
return ACT_RET_ABRT;
}
/* parse the "reject" action:
* This action takes no argument and returns ACT_RET_PRS_OK on success,
* ACT_RET_PRS_ERR on error.
*/
static enum act_parse_ret parse_http_action_reject(const char **args, int *orig_arg, struct proxy *px,
struct act_rule *rule, char **err)
{
rule->action = ACT_CUSTOM;
rule->action_ptr = http_action_reject;
return ACT_RET_PRS_OK;
}
/* This function executes the "disable-l7-retry" HTTP action.
* It disables L7 retries (all retry except for a connection failure). This
* can be useful for example to avoid retrying on POST requests.
* It just removes the L7 retry flag on the HTTP transaction, and always
* return ACT_RET_CONT;
*/
static enum act_return http_req_disable_l7_retry(struct act_rule *rule, struct proxy *px,
struct session *sess, struct stream *s, int flags)
{
/* In theory, the TX_L7_RETRY flags isn't set at this point, but
* let's be future-proof and remove it anyway.
*/
s->txn->flags &= ~TX_L7_RETRY;
s->txn->flags |= TX_D_L7_RETRY;
return ACT_RET_CONT;
}
/* parse the "disable-l7-retry" action:
* This action takes no argument and returns ACT_RET_PRS_OK on success,
* ACT_RET_PRS_ERR on error.
*/
static enum act_parse_ret parse_http_req_disable_l7_retry(const char **args,
int *orig_args, struct proxy *px,
struct act_rule *rule, char **err)
{
rule->action = ACT_CUSTOM;
rule->action_ptr = http_req_disable_l7_retry;
return ACT_RET_PRS_OK;
}
/* This function executes the "capture" action. It executes a fetch expression,
* turns the result into a string and puts it in a capture slot. It always
* returns 1. If an error occurs the action is cancelled, but the rule
* processing continues.
*/
static enum act_return http_action_req_capture(struct act_rule *rule, struct proxy *px,
struct session *sess, struct stream *s, int flags)
{
struct sample *key;
struct cap_hdr *h = rule->arg.cap.hdr;
char **cap = s->req_cap;
int len;
key = sample_fetch_as_type(s->be, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL, rule->arg.cap.expr, SMP_T_STR);
if (!key)
return ACT_RET_CONT;
if (cap[h->index] == NULL)
cap[h->index] = pool_alloc(h->pool);
if (cap[h->index] == NULL) /* no more capture memory */
return ACT_RET_CONT;
len = key->data.u.str.data;
if (len > h->len)
len = h->len;
memcpy(cap[h->index], key->data.u.str.area, len);
cap[h->index][len] = 0;
return ACT_RET_CONT;
}
/* This function executes the "capture" action and store the result in a
* capture slot if exists. It executes a fetch expression, turns the result
* into a string and puts it in a capture slot. It always returns 1. If an
* error occurs the action is cancelled, but the rule processing continues.
*/
static enum act_return http_action_req_capture_by_id(struct act_rule *rule, struct proxy *px,
struct session *sess, struct stream *s, int flags)
{
struct sample *key;
struct cap_hdr *h;
char **cap = s->req_cap;
struct proxy *fe = strm_fe(s);
int len;
int i;
/* Look for the original configuration. */
for (h = fe->req_cap, i = fe->nb_req_cap - 1;
h != NULL && i != rule->arg.capid.idx ;
i--, h = h->next);
if (!h)
return ACT_RET_CONT;
key = sample_fetch_as_type(s->be, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL, rule->arg.capid.expr, SMP_T_STR);
if (!key)
return ACT_RET_CONT;
if (cap[h->index] == NULL)
cap[h->index] = pool_alloc(h->pool);
if (cap[h->index] == NULL) /* no more capture memory */
return ACT_RET_CONT;
len = key->data.u.str.data;
if (len > h->len)
len = h->len;
memcpy(cap[h->index], key->data.u.str.area, len);
cap[h->index][len] = 0;
return ACT_RET_CONT;
}
/* Check an "http-request capture" action.
*
* The function returns 1 in success case, otherwise, it returns 0 and err is
* filled.
*/
static int check_http_req_capture(struct act_rule *rule, struct proxy *px, char **err)
{
if (rule->action_ptr != http_action_req_capture_by_id)
return 1;
/* capture slots can only be declared in frontends, so we can't check their
* existence in backends at configuration parsing step
*/
if (px->cap & PR_CAP_FE && rule->arg.capid.idx >= px->nb_req_cap) {
memprintf(err, "unable to find capture id '%d' referenced by http-request capture rule",
rule->arg.capid.idx);
return 0;
}
return 1;
}
/* Release memory allocate by an http capture action */
static void release_http_capture(struct act_rule *rule)
{
if (rule->action_ptr == http_action_req_capture)
release_sample_expr(rule->arg.cap.expr);
else
release_sample_expr(rule->arg.capid.expr);
}
/* parse an "http-request capture" action. It takes a single argument which is
* a sample fetch expression. It stores the expression into arg->act.p[0] and
* the allocated hdr_cap struct or the preallocated "id" into arg->act.p[1].
* It returns ACT_RET_PRS_OK on success, ACT_RET_PRS_ERR on error.
*/
static enum act_parse_ret parse_http_req_capture(const char **args, int *orig_arg, struct proxy *px,
struct act_rule *rule, char **err)
{
struct sample_expr *expr;
struct cap_hdr *hdr;
int cur_arg;
int len = 0;
for (cur_arg = *orig_arg; cur_arg < *orig_arg + 3 && *args[cur_arg]; cur_arg++)
if (strcmp(args[cur_arg], "if") == 0 ||
strcmp(args[cur_arg], "unless") == 0)
break;
if (cur_arg < *orig_arg + 3) {
memprintf(err, "expects <expression> [ 'len' <length> | id <idx> ]");
return ACT_RET_PRS_ERR;
}
cur_arg = *orig_arg;
expr = sample_parse_expr((char **)args, &cur_arg, px->conf.args.file, px->conf.args.line, err, &px->conf.args, NULL);
if (!expr)
return ACT_RET_PRS_ERR;
if (!(expr->fetch->val & SMP_VAL_FE_HRQ_HDR)) {
memprintf(err,
"fetch method '%s' extracts information from '%s', none of which is available here",
args[cur_arg-1], sample_src_names(expr->fetch->use));
release_sample_expr(expr);
return ACT_RET_PRS_ERR;
}
if (!args[cur_arg] || !*args[cur_arg]) {
memprintf(err, "expects 'len or 'id'");
release_sample_expr(expr);
return ACT_RET_PRS_ERR;
}
if (strcmp(args[cur_arg], "len") == 0) {
cur_arg++;
if (!(px->cap & PR_CAP_FE)) {
memprintf(err, "proxy '%s' has no frontend capability", px->id);
release_sample_expr(expr);
return ACT_RET_PRS_ERR;
}
px->conf.args.ctx = ARGC_CAP;
if (!args[cur_arg]) {
memprintf(err, "missing length value");
release_sample_expr(expr);
return ACT_RET_PRS_ERR;
}
/* we copy the table name for now, it will be resolved later */
len = atoi(args[cur_arg]);
if (len <= 0) {
memprintf(err, "length must be > 0");
release_sample_expr(expr);
return ACT_RET_PRS_ERR;
}
cur_arg++;
hdr = calloc(1, sizeof(*hdr));
if (!hdr) {
memprintf(err, "out of memory");
release_sample_expr(expr);
return ACT_RET_PRS_ERR;
}
hdr->next = px->req_cap;
hdr->name = NULL; /* not a header capture */
hdr->namelen = 0;
hdr->len = len;
hdr->pool = create_pool("caphdr", hdr->len + 1, MEM_F_SHARED);
hdr->index = px->nb_req_cap++;
px->req_cap = hdr;
px->to_log |= LW_REQHDR;
rule->action = ACT_CUSTOM;
rule->action_ptr = http_action_req_capture;
rule->release_ptr = release_http_capture;
rule->arg.cap.expr = expr;
rule->arg.cap.hdr = hdr;
}
else if (strcmp(args[cur_arg], "id") == 0) {
int id;
char *error;
cur_arg++;
if (!args[cur_arg]) {
memprintf(err, "missing id value");
release_sample_expr(expr);
return ACT_RET_PRS_ERR;
}
id = strtol(args[cur_arg], &error, 10);
if (*error != '\0') {
memprintf(err, "cannot parse id '%s'", args[cur_arg]);
release_sample_expr(expr);
return ACT_RET_PRS_ERR;
}
cur_arg++;
px->conf.args.ctx = ARGC_CAP;
rule->action = ACT_CUSTOM;
rule->action_ptr = http_action_req_capture_by_id;
rule->check_ptr = check_http_req_capture;
rule->release_ptr = release_http_capture;
rule->arg.capid.expr = expr;
rule->arg.capid.idx = id;
}
else {
memprintf(err, "expects 'len' or 'id', found '%s'", args[cur_arg]);