| /* 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 */ |
| }; |
