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-rw-r--r--modules/aaa/mod_authz_host.c410
1 files changed, 410 insertions, 0 deletions
diff --git a/modules/aaa/mod_authz_host.c b/modules/aaa/mod_authz_host.c
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+++ b/modules/aaa/mod_authz_host.c
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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.
+ */
+
+/*
+ * 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 */
+};