| /* 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_core.h" |
| #include "http_config.h" |
| #include "http_protocol.h" |
| #include "http_request.h" |
| #include "http_log.h" |
| #include "apr_strings.h" |
| |
| /** |
| * This module makes it easy to restrict what HTTP methods can be ran against |
| * a server. |
| * |
| * It provides one comand: |
| * AllowMethods |
| * This command takes a list of HTTP methods to allow. |
| * |
| * The most common configuration should be like this: |
| * <Directory /> |
| * AllowMethods GET HEAD OPTIONS |
| * </Directory> |
| * <Directory /special/cgi-bin> |
| * AllowMethods GET HEAD OPTIONS POST |
| * </Directory> |
| * Non-matching methods will be returned a status 405 (method not allowed) |
| * |
| * To allow all methods, and effectively turn off mod_allowmethods, use: |
| * AllowMethods reset |
| */ |
| |
| typedef struct am_conf_t { |
| int allowed_set; |
| apr_int64_t allowed; |
| } am_conf_t; |
| |
| module AP_MODULE_DECLARE_DATA allowmethods_module; |
| |
| static int am_check_access(request_rec *r) |
| { |
| int method = r->method_number; |
| am_conf_t *conf; |
| |
| conf = (am_conf_t *) ap_get_module_config(r->per_dir_config, |
| &allowmethods_module); |
| if (!conf || conf->allowed == 0) { |
| return DECLINED; |
| } |
| |
| r->allowed = conf->allowed; |
| |
| if (conf->allowed & (AP_METHOD_BIT << method)) { |
| return DECLINED; |
| } |
| |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01623) |
| "client method denied by server configuration: '%s' to %s%s", |
| r->method, |
| r->filename ? "" : "uri ", |
| r->filename ? r->filename : r->uri); |
| |
| return HTTP_METHOD_NOT_ALLOWED; |
| } |
| |
| static void *am_create_conf(apr_pool_t *p, char *dummy) |
| { |
| am_conf_t *conf = apr_pcalloc(p, sizeof(am_conf_t)); |
| |
| conf->allowed = 0; |
| conf->allowed_set = 0; |
| return conf; |
| } |
| |
| static void *am_merge_conf(apr_pool_t *pool, void *a, void *b) |
| { |
| am_conf_t *base = (am_conf_t *)a; |
| am_conf_t *add = (am_conf_t *)b; |
| am_conf_t *conf = apr_palloc(pool, sizeof(am_conf_t)); |
| |
| if (add->allowed_set) { |
| conf->allowed = add->allowed; |
| conf->allowed_set = add->allowed_set; |
| } |
| else { |
| conf->allowed = base->allowed; |
| conf->allowed_set = base->allowed_set; |
| } |
| |
| return conf; |
| } |
| |
| static const char *am_allowmethods(cmd_parms *cmd, void *d, int argc, |
| char *const argv[]) |
| { |
| int i; |
| am_conf_t *conf = (am_conf_t *)d; |
| |
| if (argc == 0) { |
| return "AllowMethods: No method or 'reset' keyword given"; |
| } |
| if (argc == 1) { |
| if (strcasecmp("reset", argv[0]) == 0) { |
| conf->allowed = 0; |
| conf->allowed_set = 1; |
| return NULL; |
| } |
| } |
| |
| for (i = 0; i < argc; i++) { |
| int m; |
| |
| m = ap_method_number_of(argv[i]); |
| if (m == M_INVALID) { |
| return apr_pstrcat(cmd->pool, "AllowMethods: Invalid Method '", |
| argv[i], "'", NULL); |
| } |
| |
| conf->allowed |= (AP_METHOD_BIT << m); |
| } |
| conf->allowed_set = 1; |
| return NULL; |
| } |
| |
| static void am_register_hooks(apr_pool_t * p) |
| { |
| ap_hook_access_checker(am_check_access, NULL, NULL, APR_HOOK_REALLY_FIRST); |
| } |
| |
| static const command_rec am_cmds[] = { |
| AP_INIT_TAKE_ARGV("AllowMethods", am_allowmethods, NULL, |
| ACCESS_CONF, |
| "only allow specific methods"), |
| {NULL} |
| }; |
| |
| AP_DECLARE_MODULE(allowmethods) = { |
| STANDARD20_MODULE_STUFF, |
| am_create_conf, |
| am_merge_conf, |
| NULL, |
| NULL, |
| am_cmds, |
| am_register_hooks, |
| }; |