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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "httpd.h"
#include "http_config.h"
#include "http_request.h"
#include "http_log.h"
module AP_MODULE_DECLARE_DATA allowhandlers_module;
typedef enum {
AH_ALLOW = 0,
AH_DENY = 1,
} ah_op_e;
typedef struct {
apr_table_t *handlers;
ah_op_e op;
} ah_conf_t;
static const char * const forbidden_handler = "forbidden";
static const char * const no_handler = "none";
static int ah_fixups(request_rec *r)
{
ah_conf_t *conf = ap_get_module_config(r->per_dir_config,
&allowhandlers_module);
int match = 0;
const char *handler_name;
if (!r->handler || r->handler[0] == '\0') {
handler_name = no_handler;
}
else if (strcasecmp(r->handler, forbidden_handler) == 0) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
APLOGNO(02398) "Handler 'forbidden' denied by "
"server configuration: URI %s (file %s)",
r->uri, r->filename);
return HTTP_FORBIDDEN;
}
else {
handler_name = r->handler;
}
if (!conf)
return DECLINED;
if (conf->handlers && apr_table_get(conf->handlers, handler_name))
match = 1;
if ((match && conf->op == AH_ALLOW) || (!match && conf->op == AH_DENY)) {
return DECLINED;
}
else {
if (handler_name != no_handler) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
APLOGNO(02399) "Handler '%s' denied by "
"server configuration: URI %s (file %s)",
r->handler, r->uri, r->filename);
}
else {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
APLOGNO(02400) "Handler denied by server "
"configuration: No handler set for URI %s (file %s)",
r->uri, r->filename);
}
return HTTP_FORBIDDEN;
}
}
static void *ah_create_conf(apr_pool_t * p, char *dummy)
{
ah_conf_t *conf = apr_pcalloc(p, sizeof(ah_conf_t));
conf->op = AH_DENY;
return conf;
}
static const char *set_allowed_handlers(cmd_parms *cmd, void *d, int argc, char *const argv[])
{
int i;
ah_conf_t* conf = (ah_conf_t*) d;
const char *err = ap_check_cmd_context(cmd, NOT_IN_HTACCESS);
if (err)
return err;
if (argc == 0)
return "AllowHandlers: No handler name given";
conf->op = AH_ALLOW;
if (conf->handlers)
apr_table_clear(conf->handlers);
for (i = 0; i < argc; i++) {
if (strcasecmp(argv[i], forbidden_handler) == 0 && conf->op != AH_DENY)
return "Handler name 'forbidden' cannot be changed.";
if (strcasecmp(argv[i], "all") == 0) {
if (argc != 1)
return "'all' not possible with specific handler names";
conf->op = AH_DENY;
return NULL;
}
else if (strcasecmp(argv[i], "not") == 0) {
if (i != 0 || argc == 1)
return "'not' must come before specific handler names";
conf->op = AH_DENY;
}
else {
if (!conf->handlers)
conf->handlers = apr_table_make(cmd->pool, 4);
apr_table_setn(conf->handlers, argv[i], "1");
}
}
return NULL;
}
static void ah_register_hooks(apr_pool_t * p)
{
ap_hook_fixups(ah_fixups, NULL, NULL, APR_HOOK_REALLY_LAST);
}
static const command_rec ah_cmds[] = {
AP_INIT_TAKE_ARGV("AllowHandlers", set_allowed_handlers, NULL, ACCESS_CONF,
"only allow specific handlers (use 'not' to negate)"),
{NULL}
};
AP_DECLARE_MODULE(allowhandlers) = {
STANDARD20_MODULE_STUFF,
ah_create_conf,
NULL,
NULL,
NULL,
ah_cmds,
ah_register_hooks,
};
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