blob: 318603698e2c897046787371a04545065ac8ff39 [file] [log] [blame]
/*
* HTTP rules parsing and registration
*
* 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_rules.h>
#include <haproxy/log.h>
#include <haproxy/pool.h>
#include <haproxy/proxy.h>
#include <haproxy/sample.h>
#include <haproxy/tools.h>
#include <haproxy/version.h>
/* List head of all known action keywords for "http-request" */
struct action_kw_list http_req_keywords = {
.list = LIST_HEAD_INIT(http_req_keywords.list)
};
/* List head of all known action keywords for "http-response" */
struct action_kw_list http_res_keywords = {
.list = LIST_HEAD_INIT(http_res_keywords.list)
};
/* List head of all known action keywords for "http-after-response" */
struct action_kw_list http_after_res_keywords = {
.list = LIST_HEAD_INIT(http_after_res_keywords.list)
};
/*
* Return the struct http_req_action_kw associated to a keyword.
*/
struct action_kw *action_http_req_custom(const char *kw)
{
return action_lookup(&http_req_keywords.list, kw);
}
/*
* Return the struct http_res_action_kw associated to a keyword.
*/
struct action_kw *action_http_res_custom(const char *kw)
{
return action_lookup(&http_res_keywords.list, kw);
}
/*
* Return the struct http_after_res_action_kw associated to a keyword.
*/
struct action_kw *action_http_after_res_custom(const char *kw)
{
return action_lookup(&http_after_res_keywords.list, kw);
}
/* parse an "http-request" rule */
struct act_rule *parse_http_req_cond(const char **args, const char *file, int linenum, struct proxy *proxy)
{
struct act_rule *rule;
const struct action_kw *custom = NULL;
int cur_arg;
rule = calloc(1, sizeof(*rule));
if (!rule) {
ha_alert("parsing [%s:%d]: out of memory.\n", file, linenum);
goto out_err;
}
rule->from = ACT_F_HTTP_REQ;
if (((custom = action_http_req_custom(args[0])) != NULL)) {
char *errmsg = NULL;
cur_arg = 1;
/* try in the module list */
rule->kw = custom;
if (custom->flags & KWF_EXPERIMENTAL) {
if (!experimental_directives_allowed) {
ha_alert("parsing [%s:%d] : '%s' action is experimental, must be allowed via a global 'expose-experimental-directives'\n",
file, linenum, custom->kw);
goto out_err;
}
mark_tainted(TAINTED_CONFIG_EXP_KW_DECLARED);
}
if (custom->parse(args, &cur_arg, proxy, rule, &errmsg) == ACT_RET_PRS_ERR) {
ha_alert("parsing [%s:%d] : error detected in %s '%s' while parsing 'http-request %s' rule : %s.\n",
file, linenum, proxy_type_str(proxy), proxy->id, args[0], errmsg);
free(errmsg);
goto out_err;
}
else if (errmsg) {
ha_warning("parsing [%s:%d] : %s.\n", file, linenum, errmsg);
free(errmsg);
}
}
else {
const char *best = action_suggest(args[0], &http_req_keywords.list, NULL);
action_build_list(&http_req_keywords.list, &trash);
ha_alert("parsing [%s:%d]: 'http-request' expects %s, but got '%s'%s.%s%s%s\n",
file, linenum, trash.area,
args[0], *args[0] ? "" : " (missing argument)",
best ? " Did you mean '" : "",
best ? best : "",
best ? "' maybe ?" : "");
goto out_err;
}
if (strcmp(args[cur_arg], "if") == 0 || strcmp(args[cur_arg], "unless") == 0) {
struct acl_cond *cond;
char *errmsg = NULL;
if ((cond = build_acl_cond(file, linenum, &proxy->acl, proxy, args+cur_arg, &errmsg)) == NULL) {
ha_alert("parsing [%s:%d] : error detected while parsing an 'http-request %s' condition : %s.\n",
file, linenum, args[0], errmsg);
free(errmsg);
goto out_err;
}
rule->cond = cond;
}
else if (*args[cur_arg]) {
ha_alert("parsing [%s:%d]: 'http-request %s' expects"
" either 'if' or 'unless' followed by a condition but found '%s'.\n",
file, linenum, args[0], args[cur_arg]);
goto out_err;
}
return rule;
out_err:
free(rule);
return NULL;
}
/* parse an "http-respose" rule */
struct act_rule *parse_http_res_cond(const char **args, const char *file, int linenum, struct proxy *proxy)
{
struct act_rule *rule;
const struct action_kw *custom = NULL;
int cur_arg;
rule = calloc(1, sizeof(*rule));
if (!rule) {
ha_alert("parsing [%s:%d]: out of memory.\n", file, linenum);
goto out_err;
}
rule->from = ACT_F_HTTP_RES;
if (((custom = action_http_res_custom(args[0])) != NULL)) {
char *errmsg = NULL;
cur_arg = 1;
/* try in the module list */
rule->kw = custom;
if (custom->flags & KWF_EXPERIMENTAL) {
if (!experimental_directives_allowed) {
ha_alert("parsing [%s:%d] : '%s' action is experimental, must be allowed via a global 'expose-experimental-directives'\n",
file, linenum, custom->kw);
goto out_err;
}
mark_tainted(TAINTED_CONFIG_EXP_KW_DECLARED);
}
if (custom->parse(args, &cur_arg, proxy, rule, &errmsg) == ACT_RET_PRS_ERR) {
ha_alert("parsing [%s:%d] : error detected in %s '%s' while parsing 'http-response %s' rule : %s.\n",
file, linenum, proxy_type_str(proxy), proxy->id, args[0], errmsg);
free(errmsg);
goto out_err;
}
else if (errmsg) {
ha_warning("parsing [%s:%d] : %s.\n", file, linenum, errmsg);
free(errmsg);
}
}
else {
const char *best = action_suggest(args[0], &http_res_keywords.list, NULL);
action_build_list(&http_res_keywords.list, &trash);
ha_alert("parsing [%s:%d]: 'http-response' expects %s, but got '%s'%s.%s%s%s\n",
file, linenum, trash.area,
args[0], *args[0] ? "" : " (missing argument)",
best ? " Did you mean '" : "",
best ? best : "",
best ? "' maybe ?" : "");
goto out_err;
}
if (strcmp(args[cur_arg], "if") == 0 || strcmp(args[cur_arg], "unless") == 0) {
struct acl_cond *cond;
char *errmsg = NULL;
if ((cond = build_acl_cond(file, linenum, &proxy->acl, proxy, args+cur_arg, &errmsg)) == NULL) {
ha_alert("parsing [%s:%d] : error detected while parsing an 'http-response %s' condition : %s.\n",
file, linenum, args[0], errmsg);
free(errmsg);
goto out_err;
}
rule->cond = cond;
}
else if (*args[cur_arg]) {
ha_alert("parsing [%s:%d]: 'http-response %s' expects"
" either 'if' or 'unless' followed by a condition but found '%s'.\n",
file, linenum, args[0], args[cur_arg]);
goto out_err;
}
return rule;
out_err:
free(rule);
return NULL;
}
/* parse an "http-after-response" rule */
struct act_rule *parse_http_after_res_cond(const char **args, const char *file, int linenum, struct proxy *proxy)
{
struct act_rule *rule;
const struct action_kw *custom = NULL;
int cur_arg;
rule = calloc(1, sizeof(*rule));
if (!rule) {
ha_alert("parsing [%s:%d]: out of memory.\n", file, linenum);
goto out_err;
}
rule->from = ACT_F_HTTP_RES;
if (((custom = action_http_after_res_custom(args[0])) != NULL)) {
char *errmsg = NULL;
cur_arg = 1;
/* try in the module list */
rule->kw = custom;
if (custom->parse(args, &cur_arg, proxy, rule, &errmsg) == ACT_RET_PRS_ERR) {
ha_alert("parsing [%s:%d] : error detected in %s '%s' while parsing 'http-after-response %s' rule : %s.\n",
file, linenum, proxy_type_str(proxy), proxy->id, args[0], errmsg);
free(errmsg);
goto out_err;
}
else if (errmsg) {
ha_warning("parsing [%s:%d] : %s.\n", file, linenum, errmsg);
free(errmsg);
}
}
else {
const char *best = action_suggest(args[0], &http_after_res_keywords.list, NULL);
action_build_list(&http_after_res_keywords.list, &trash);
ha_alert("parsing [%s:%d]: 'http-after-response' expects %s, but got '%s'%s.%s%s%s\n",
file, linenum, trash.area,
args[0], *args[0] ? "" : " (missing argument)",
best ? " Did you mean '" : "",
best ? best : "",
best ? "' maybe ?" : "");
goto out_err;
}
if (strcmp(args[cur_arg], "if") == 0 || strcmp(args[cur_arg], "unless") == 0) {
struct acl_cond *cond;
char *errmsg = NULL;
if ((cond = build_acl_cond(file, linenum, &proxy->acl, proxy, args+cur_arg, &errmsg)) == NULL) {
ha_alert("parsing [%s:%d] : error detected while parsing an 'http-after-response %s' condition : %s.\n",
file, linenum, args[0], errmsg);
free(errmsg);
goto out_err;
}
rule->cond = cond;
}
else if (*args[cur_arg]) {
ha_alert("parsing [%s:%d]: 'http-after-response %s' expects"
" either 'if' or 'unless' followed by a condition but found '%s'.\n",
file, linenum, args[0], args[cur_arg]);
goto out_err;
}
return rule;
out_err:
free(rule);
return NULL;
}
/* Parses a redirect rule. Returns the redirect rule on success or NULL on error,
* with <err> filled with the error message. If <use_fmt> is not null, builds a
* dynamic log-format rule instead of a static string. Parameter <dir> indicates
* the direction of the rule, and equals 0 for request, non-zero for responses.
*/
struct redirect_rule *http_parse_redirect_rule(const char *file, int linenum, struct proxy *curproxy,
const char **args, char **errmsg, int use_fmt, int dir)
{
struct redirect_rule *rule;
int cur_arg;
int type = REDIRECT_TYPE_NONE;
int code = 302;
const char *destination = NULL;
const char *cookie = NULL;
int cookie_set = 0;
unsigned int flags = (!dir ? REDIRECT_FLAG_FROM_REQ : REDIRECT_FLAG_NONE);
struct acl_cond *cond = NULL;
cur_arg = 0;
while (*(args[cur_arg])) {
if (strcmp(args[cur_arg], "location") == 0) {
if (!*args[cur_arg + 1])
goto missing_arg;
type = REDIRECT_TYPE_LOCATION;
cur_arg++;
destination = args[cur_arg];
}
else if (strcmp(args[cur_arg], "prefix") == 0) {
if (!*args[cur_arg + 1])
goto missing_arg;
type = REDIRECT_TYPE_PREFIX;
cur_arg++;
destination = args[cur_arg];
}
else if (strcmp(args[cur_arg], "scheme") == 0) {
if (!*args[cur_arg + 1])
goto missing_arg;
type = REDIRECT_TYPE_SCHEME;
cur_arg++;
destination = args[cur_arg];
}
else if (strcmp(args[cur_arg], "set-cookie") == 0) {
if (!*args[cur_arg + 1])
goto missing_arg;
cur_arg++;
cookie = args[cur_arg];
cookie_set = 1;
}
else if (strcmp(args[cur_arg], "clear-cookie") == 0) {
if (!*args[cur_arg + 1])
goto missing_arg;
cur_arg++;
cookie = args[cur_arg];
cookie_set = 0;
}
else if (strcmp(args[cur_arg], "code") == 0) {
if (!*args[cur_arg + 1])
goto missing_arg;
cur_arg++;
code = atol(args[cur_arg]);
if (code < 301 || code > 308 || (code > 303 && code < 307)) {
memprintf(errmsg,
"'%s': unsupported HTTP code '%s' (must be one of 301, 302, 303, 307 or 308)",
args[cur_arg - 1], args[cur_arg]);
return NULL;
}
}
else if (strcmp(args[cur_arg], "drop-query") == 0) {
flags |= REDIRECT_FLAG_DROP_QS;
}
else if (strcmp(args[cur_arg], "append-slash") == 0) {
flags |= REDIRECT_FLAG_APPEND_SLASH;
}
else if (strcmp(args[cur_arg], "if") == 0 ||
strcmp(args[cur_arg], "unless") == 0) {
cond = build_acl_cond(file, linenum, &curproxy->acl, curproxy, (const char **)args + cur_arg, errmsg);
if (!cond) {
memprintf(errmsg, "error in condition: %s", *errmsg);
return NULL;
}
break;
}
else {
memprintf(errmsg,
"expects 'code', 'prefix', 'location', 'scheme', 'set-cookie', 'clear-cookie', 'drop-query' or 'append-slash' (was '%s')",
args[cur_arg]);
return NULL;
}
cur_arg++;
}
if (type == REDIRECT_TYPE_NONE) {
memprintf(errmsg, "redirection type expected ('prefix', 'location', or 'scheme')");
return NULL;
}
if (dir && type != REDIRECT_TYPE_LOCATION) {
memprintf(errmsg, "response only supports redirect type 'location'");
return NULL;
}
rule = calloc(1, sizeof(*rule));
rule->cond = cond;
LIST_INIT(&rule->rdr_fmt);
if (!use_fmt) {
/* old-style static redirect rule */
rule->rdr_str = strdup(destination);
rule->rdr_len = strlen(destination);
}
else {
/* log-format based redirect rule */
/* Parse destination. Note that in the REDIRECT_TYPE_PREFIX case,
* if prefix == "/", we don't want to add anything, otherwise it
* makes it hard for the user to configure a self-redirection.
*/
curproxy->conf.args.ctx = ARGC_RDR;
if (!(type == REDIRECT_TYPE_PREFIX && destination[0] == '/' && destination[1] == '\0')) {
if (!parse_logformat_string(destination, curproxy, &rule->rdr_fmt, LOG_OPT_HTTP,
dir ? (curproxy->cap & PR_CAP_FE) ? SMP_VAL_FE_HRS_HDR : SMP_VAL_BE_HRS_HDR
: (curproxy->cap & PR_CAP_FE) ? SMP_VAL_FE_HRQ_HDR : SMP_VAL_BE_HRQ_HDR,
errmsg)) {
return NULL;
}
free(curproxy->conf.lfs_file);
curproxy->conf.lfs_file = strdup(curproxy->conf.args.file);
curproxy->conf.lfs_line = curproxy->conf.args.line;
}
}
if (cookie) {
/* depending on cookie_set, either we want to set the cookie, or to clear it.
* a clear consists in appending "; path=/; Max-Age=0;" at the end.
*/
rule->cookie_len = strlen(cookie);
if (cookie_set) {
rule->cookie_str = malloc(rule->cookie_len + 10);
memcpy(rule->cookie_str, cookie, rule->cookie_len);
memcpy(rule->cookie_str + rule->cookie_len, "; path=/;", 10);
rule->cookie_len += 9;
} else {
rule->cookie_str = malloc(rule->cookie_len + 21);
memcpy(rule->cookie_str, cookie, rule->cookie_len);
memcpy(rule->cookie_str + rule->cookie_len, "; path=/; Max-Age=0;", 21);
rule->cookie_len += 20;
}
}
rule->type = type;
rule->code = code;
rule->flags = flags;
LIST_INIT(&rule->list);
return rule;
missing_arg:
memprintf(errmsg, "missing argument for '%s'", args[cur_arg]);
return NULL;
}
__attribute__((constructor))
static void __http_rules_init(void)
{
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/