Hello folks,
I would like something like "Require XXX foo.dynamic-dns.somewhere" (where XXX could be "name", "hostname", "dynamic", ...) which would query the NS when the HTTP request is received and check that the corresponding ip is the client IP.I'm planing to develop a small module for that, and as it is somehow quite a basic service it could be a candidate for being added to "modules/aaa/mod_authz_host.c".
Attached is a working version with the syntax "Requite name foo.somewhere".
Note sure whether "name" is the best... name for the authorization provider, though.
I could append this to mod_authz_host.c & update the documentation if I'm given a go.
-- Fabien
/* 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. */ /* * Security options etc. * * Module derived from code originally written by Rob McCool * */ #include "apr_strings.h" #include "apr_network_io.h" #include "apr_md5.h" #include "apr_hash.h" #define APR_WANT_STRFUNC #define APR_WANT_BYTEFUNC #include "apr_want.h" #include "ap_config.h" #include "ap_provider.h" #include "httpd.h" #include "http_core.h" #include "http_config.h" #include "http_log.h" #include "http_protocol.h" #include "http_request.h" #include "mod_auth.h" #if APR_HAVE_NETINET_IN_H #include <netinet/in.h> #endif static authz_status name_check_authorization(request_rec *r, const char *require_line, const void *parsed_require_line) { const char *err = NULL; const ap_expr_info_t *expr = parsed_require_line; const char *require, *t; char *w; /* the require line is an expression, which is evaluated now. */ require = ap_expr_str_exec(r, expr, &err); if (err) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, // APLOGNO(FIXME) "name_check_authorization: " "Can't evaluate require expression: %s", err); return AUTHZ_DENIED; } /* tokenize expected list of names */ t = require; while ((w = ap_getword_conf(r->pool, &t)) && w[0]) { apr_sockaddr_t *sa; apr_status_t rv; char *hash_ptr; /* stop on apache configuration file comments */ if ((hash_ptr = ap_strchr(w, '#'))) { if (hash_ptr == w) { break; } *hash_ptr = '\0'; } /* does the client ip match one of the name? */ rv = apr_sockaddr_info_get(&sa, w, APR_UNSPEC, 0, 0, r->pool); if (rv == APR_SUCCESS) { while (sa) { int match = apr_sockaddr_equal(sa, r->useragent_addr); ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, // APLOGNO(FIXME) "name_check_authorization: %s for %s: %s", w, r->useragent_ip, match? "yes": "no"); if (match) { return AUTHZ_GRANTED; } sa = sa->next; } } else { ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, // APLOGNO(FIXME) "name_check_authorization: no sockaddr info for \"%s\"", w); } /* stop processing, we are in a comment */ if (hash_ptr) { break; } } return AUTHZ_DENIED; } /* copy of host_parse_config */ static const char *name_parse_config(cmd_parms *cmd, const char *require_line, const void **parsed_require_line) { const char *expr_err = NULL; ap_expr_info_t *expr; expr = ap_expr_parse_cmd(cmd, require_line, AP_EXPR_FLAG_STRING_RESULT, &expr_err, NULL); if (expr_err) return apr_pstrcat(cmd->temp_pool, "Cannot parse expression in require line: ", expr_err, NULL); *parsed_require_line = expr; return NULL; } static const authz_provider authz_name_provider = { &name_check_authorization, &name_parse_config, }; static void register_hooks(apr_pool_t *p) { ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "name", AUTHZ_PROVIDER_VERSION, &authz_name_provider, AP_AUTH_INTERNAL_PER_CONF); } AP_DECLARE_MODULE(authz_name) = { STANDARD20_MODULE_STUFF, NULL, /* dir config creater */ NULL, /* dir merger --- default is to override */ NULL, /* server config */ NULL, /* merge server config */ NULL, register_hooks /* register hooks */ };
