| /* 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 | |
| /* | |
| * To save memory if the same subnets are used in hundres of vhosts, we store | |
| * each subnet only once and use this temporary hash to find it again. | |
| */ | |
| static apr_hash_t *parsed_subnets; | |
| static apr_ipsubnet_t *localhost_v4; | |
| #if APR_HAVE_IPV6 | |
| static apr_ipsubnet_t *localhost_v6; | |
| #endif | |
| static int in_domain(const char *domain, const char *what) | |
| { | |
| int dl = strlen(domain); | |
| int wl = strlen(what); | |
| if ((wl - dl) >= 0) { | |
| if (strcasecmp(domain, &what[wl - dl]) != 0) { | |
| return 0; | |
| } | |
| /* Make sure we matched an *entire* subdomain --- if the user | |
| * said 'allow from good.com', we don't want people from nogood.com | |
| * to be able to get in. | |
| */ | |
| if (wl == dl) { | |
| return 1; /* matched whole thing */ | |
| } | |
| else { | |
| return (domain[0] == '.' || what[wl - dl - 1] == '.'); | |
| } | |
| } | |
| else { | |
| return 0; | |
| } | |
| } | |
| static const char *ip_parse_config(cmd_parms *cmd, | |
| const char *require_line, | |
| const void **parsed_require_line) | |
| { | |
| const char *t, *w; | |
| int count = 0; | |
| apr_ipsubnet_t **ip; | |
| apr_pool_t *ptemp = cmd->temp_pool; | |
| apr_pool_t *p = cmd->pool; | |
| /* The 'ip' provider will allow the configuration to specify a list of | |
| ip addresses to check rather than a single address. This is different | |
| from the previous host based syntax. */ | |
| t = require_line; | |
| while ((w = ap_getword_conf(ptemp, &t)) && w[0]) | |
| count++; | |
| if (count == 0) | |
| return "'require ip' requires an argument"; | |
| ip = apr_pcalloc(p, sizeof(apr_ipsubnet_t *) * (count + 1)); | |
| *parsed_require_line = ip; | |
| t = require_line; | |
| while ((w = ap_getword_conf(ptemp, &t)) && w[0]) { | |
| char *addr = apr_pstrdup(ptemp, w); | |
| char *mask; | |
| apr_status_t rv; | |
| if (parsed_subnets && | |
| (*ip = apr_hash_get(parsed_subnets, w, APR_HASH_KEY_STRING)) != NULL) | |
| { | |
| /* we already have parsed this subnet */ | |
| ip++; | |
| continue; | |
| } | |
| if ((mask = ap_strchr(addr, '/'))) | |
| *mask++ = '\0'; | |
| rv = apr_ipsubnet_create(ip, addr, mask, p); | |
| if(APR_STATUS_IS_EINVAL(rv)) { | |
| /* looked nothing like an IP address */ | |
| return apr_psprintf(p, "ip address '%s' appears to be invalid", w); | |
| } | |
| else if (rv != APR_SUCCESS) { | |
| return apr_psprintf(p, "ip address '%s' appears to be invalid: %pm", | |
| w, &rv); | |
| } | |
| if (parsed_subnets) | |
| apr_hash_set(parsed_subnets, w, APR_HASH_KEY_STRING, *ip); | |
| ip++; | |
| } | |
| return NULL; | |
| } | |
| static authz_status ip_check_authorization(request_rec *r, | |
| const char *require_line, | |
| const void *parsed_require_line) | |
| { | |
| /* apr_ipsubnet_test should accept const but doesn't */ | |
| apr_ipsubnet_t **ip = (apr_ipsubnet_t **)parsed_require_line; | |
| while (*ip) { | |
| if (apr_ipsubnet_test(*ip, r->useragent_addr)) | |
| return AUTHZ_GRANTED; | |
| ip++; | |
| } | |
| /* authz_core will log the require line and the result at DEBUG */ | |
| return AUTHZ_DENIED; | |
| } | |
| static authz_status host_check_authorization(request_rec *r, | |
| const char *require_line, | |
| const void *parsed_require_line) | |
| { | |
| const char *t, *w; | |
| const char *remotehost = NULL; | |
| int remotehost_is_ip; | |
| remotehost = ap_get_useragent_host(r, REMOTE_DOUBLE_REV, &remotehost_is_ip); | |
| if ((remotehost == NULL) || remotehost_is_ip) { | |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01753) | |
| "access check of '%s' to %s failed, reason: unable to get the " | |
| "remote host name", require_line, r->uri); | |
| } | |
| else { | |
| const char *err = NULL; | |
| const ap_expr_info_t *expr = parsed_require_line; | |
| const char *require; | |
| require = ap_expr_str_exec(r, expr, &err); | |
| if (err) { | |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02593) | |
| "authz_host authorize: require host: Can't " | |
| "evaluate require expression: %s", err); | |
| return AUTHZ_DENIED; | |
| } | |
| /* The 'host' provider will allow the configuration to specify a list of | |
| host names to check rather than a single name. This is different | |
| from the previous host based syntax. */ | |
| t = require; | |
| /* '#' is not a valid hostname character and admin could | |
| * specify 'Require host localhost# Add example.com later'. We | |
| * should not grant access to 'example.com' in that case. */ | |
| w = ap_strchr_c(t, '#'); | |
| if (w) { | |
| if (w == t) { | |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10120) | |
| "authz_host authorize: dubious empty " | |
| "'Require host %s' with only comment", t); | |
| return AUTHZ_DENIED; | |
| } | |
| ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(10121) | |
| "authz_host authorize: ignoring comment in " | |
| "'Require host %s'", t); | |
| /* Truncate the string at the #. */ | |
| t = apr_pstrmemdup(r->pool, t, w - t); | |
| } | |
| while ((w = ap_getword_conf(r->pool, &t)) && w[0]) { | |
| if (in_domain(w, remotehost)) { | |
| return AUTHZ_GRANTED; | |
| } | |
| } | |
| } | |
| /* authz_core will log the require line and the result at DEBUG */ | |
| return AUTHZ_DENIED; | |
| } | |
| static authz_status | |
| forward_dns_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(03354) | |
| "authz_host authorize: require forward-dns: " | |
| "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 names? */ | |
| 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(03355) | |
| "access check for %s as '%s': %s", | |
| r->useragent_ip, w, match? "yes": "no"); | |
| if (match) { | |
| return AUTHZ_GRANTED; | |
| } | |
| sa = sa->next; | |
| } | |
| } | |
| else { | |
| ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(03356) | |
| "No sockaddr info for \"%s\"", w); | |
| } | |
| /* stop processing, we are in a comment */ | |
| if (hash_ptr) { | |
| break; | |
| } | |
| } | |
| return AUTHZ_DENIED; | |
| } | |
| static authz_status local_check_authorization(request_rec *r, | |
| const char *require_line, | |
| const void *parsed_require_line) | |
| { | |
| if ( apr_sockaddr_equal(r->connection->local_addr, | |
| r->useragent_addr) | |
| || apr_ipsubnet_test(localhost_v4, r->useragent_addr) | |
| #if APR_HAVE_IPV6 | |
| || apr_ipsubnet_test(localhost_v6, r->useragent_addr) | |
| #endif | |
| ) | |
| { | |
| return AUTHZ_GRANTED; | |
| } | |
| return AUTHZ_DENIED; | |
| } | |
| static const char *host_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_ip_provider = | |
| { | |
| &ip_check_authorization, | |
| &ip_parse_config, | |
| }; | |
| static const authz_provider authz_host_provider = | |
| { | |
| &host_check_authorization, | |
| &host_parse_config, | |
| }; | |
| static const authz_provider authz_forward_dns_provider = | |
| { | |
| &forward_dns_check_authorization, | |
| &host_parse_config, | |
| }; | |
| static const authz_provider authz_local_provider = | |
| { | |
| &local_check_authorization, | |
| NULL, | |
| }; | |
| static int authz_host_pre_config(apr_pool_t *p, apr_pool_t *plog, | |
| apr_pool_t *ptemp) | |
| { | |
| /* we only use this hash in the parse config phase, ptemp is enough */ | |
| parsed_subnets = apr_hash_make(ptemp); | |
| apr_ipsubnet_create(&localhost_v4, "127.0.0.0", "8", p); | |
| apr_hash_set(parsed_subnets, "127.0.0.0/8", APR_HASH_KEY_STRING, localhost_v4); | |
| #if APR_HAVE_IPV6 | |
| apr_ipsubnet_create(&localhost_v6, "::1", NULL, p); | |
| apr_hash_set(parsed_subnets, "::1", APR_HASH_KEY_STRING, localhost_v6); | |
| #endif | |
| return OK; | |
| } | |
| static int authz_host_post_config(apr_pool_t *p, apr_pool_t *plog, | |
| apr_pool_t *ptemp, server_rec *s) | |
| { | |
| /* make sure we don't use this during .htaccess parsing */ | |
| parsed_subnets = NULL; | |
| return OK; | |
| } | |
| static void register_hooks(apr_pool_t *p) | |
| { | |
| ap_hook_pre_config(authz_host_pre_config, NULL, NULL, APR_HOOK_MIDDLE); | |
| ap_hook_post_config(authz_host_post_config, NULL, NULL, APR_HOOK_MIDDLE); | |
| ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "ip", | |
| AUTHZ_PROVIDER_VERSION, | |
| &authz_ip_provider, AP_AUTH_INTERNAL_PER_CONF); | |
| ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "host", | |
| AUTHZ_PROVIDER_VERSION, | |
| &authz_host_provider, AP_AUTH_INTERNAL_PER_CONF); | |
| ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "forward-dns", | |
| AUTHZ_PROVIDER_VERSION, | |
| &authz_forward_dns_provider, | |
| AP_AUTH_INTERNAL_PER_CONF); | |
| ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "local", | |
| AUTHZ_PROVIDER_VERSION, | |
| &authz_local_provider, AP_AUTH_INTERNAL_PER_CONF); | |
| } | |
| AP_DECLARE_MODULE(authz_host) = | |
| { | |
| 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 */ | |
| }; |