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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"
#define APR_WANT_STRFUNC
#define APR_WANT_BYTEFUNC
#include "apr_want.h"
#include "ap_config.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
enum allowdeny_type {
T_ENV,
T_NENV,
T_ALL,
T_IP,
T_HOST,
T_FAIL
};
typedef struct {
apr_int64_t limited;
union {
char *from;
apr_ipsubnet_t *ip;
} x;
enum allowdeny_type type;
} allowdeny;
/* things in the 'order' array */
#define DENY_THEN_ALLOW 0
#define ALLOW_THEN_DENY 1
#define MUTUAL_FAILURE 2
typedef struct {
int order[METHODS];
apr_array_header_t *allows;
apr_array_header_t *denys;
int *satisfy; /* for every method one */
} access_compat_dir_conf;
module AP_MODULE_DECLARE_DATA access_compat_module;
static void *create_access_compat_dir_config(apr_pool_t *p, char *dummy)
{
int i;
access_compat_dir_conf *conf =
(access_compat_dir_conf *)apr_pcalloc(p, sizeof(access_compat_dir_conf));
for (i = 0; i < METHODS; ++i) {
conf->order[i] = DENY_THEN_ALLOW;
}
conf->allows = apr_array_make(p, 1, sizeof(allowdeny));
conf->denys = apr_array_make(p, 1, sizeof(allowdeny));
conf->satisfy = apr_palloc(p, sizeof(*conf->satisfy) * METHODS);
for (i = 0; i < METHODS; ++i) {
conf->satisfy[i] = SATISFY_NOSPEC;
}
return (void *)conf;
}
static const char *order(cmd_parms *cmd, void *dv, const char *arg)
{
access_compat_dir_conf *d = (access_compat_dir_conf *) dv;
int i, o;
if (!strcasecmp(arg, "allow,deny"))
o = ALLOW_THEN_DENY;
else if (!strcasecmp(arg, "deny,allow"))
o = DENY_THEN_ALLOW;
else if (!strcasecmp(arg, "mutual-failure"))
o = MUTUAL_FAILURE;
else
return "unknown order";
for (i = 0; i < METHODS; ++i)
if (cmd->limited & (AP_METHOD_BIT << i))
d->order[i] = o;
return NULL;
}
static const char *satisfy(cmd_parms *cmd, void *dv, const char *arg)
{
access_compat_dir_conf *d = (access_compat_dir_conf *) dv;
int satisfy = SATISFY_NOSPEC;
int i;
if (!strcasecmp(arg, "all")) {
satisfy = SATISFY_ALL;
}
else if (!strcasecmp(arg, "any")) {
satisfy = SATISFY_ANY;
}
else {
return "Satisfy either 'any' or 'all'.";
}
for (i = 0; i < METHODS; ++i) {
if (cmd->limited & (AP_METHOD_BIT << i)) {
d->satisfy[i] = satisfy;
}
}
return NULL;
}
static const char *allow_cmd(cmd_parms *cmd, void *dv, const char *from,
const char *where_c)
{
access_compat_dir_conf *d = (access_compat_dir_conf *) dv;
allowdeny *a;
char *where = apr_pstrdup(cmd->pool, where_c);
char *s;
apr_status_t rv;
if (strcasecmp(from, "from"))
return "allow and deny must be followed by 'from'";
a = (allowdeny *) apr_array_push(cmd->info ? d->allows : d->denys);
a->x.from = where;
a->limited = cmd->limited;
if (!strncasecmp(where, "env=!", 5)) {
a->type = T_NENV;
a->x.from += 5;
}
else if (!strncasecmp(where, "env=", 4)) {
a->type = T_ENV;
a->x.from += 4;
}
else if (!strcasecmp(where, "all")) {
a->type = T_ALL;
}
else if ((s = ap_strchr(where, '/'))) {
*s++ = '\0';
rv = apr_ipsubnet_create(&a->x.ip, where, s, cmd->pool);
if(APR_STATUS_IS_EINVAL(rv)) {
/* looked nothing like an IP address */
return "An IP address was expected";
}
else if (rv != APR_SUCCESS) {
return apr_psprintf(cmd->pool, "%pm", &rv);
}
a->type = T_IP;
}
else if (!APR_STATUS_IS_EINVAL(rv = apr_ipsubnet_create(&a->x.ip, where,
NULL, cmd->pool))) {
if (rv != APR_SUCCESS)
return apr_psprintf(cmd->pool, "%pm", &rv);
a->type = T_IP;
}
else if (ap_strchr(where, '#')) {
return "No comments are allowed here";
}
else { /* no slash, didn't look like an IP address => must be a host */
a->type = T_HOST;
}
return NULL;
}
static char its_an_allow;
static const command_rec access_compat_cmds[] =
{
AP_INIT_TAKE1("order", order, NULL, OR_LIMIT,
"'allow,deny', 'deny,allow', or 'mutual-failure'"),
AP_INIT_ITERATE2("allow", allow_cmd, &its_an_allow, OR_LIMIT,
"'from' followed by hostnames or IP-address wildcards"),
AP_INIT_ITERATE2("deny", allow_cmd, NULL, OR_LIMIT,
"'from' followed by hostnames or IP-address wildcards"),
AP_INIT_TAKE1("Satisfy", satisfy, NULL, OR_AUTHCFG,
"access policy if both allow and require used ('all' or 'any')"),
{NULL}
};
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 int find_allowdeny(request_rec *r, apr_array_header_t *a, int method)
{
allowdeny *ap = (allowdeny *) a->elts;
apr_int64_t mmask = (AP_METHOD_BIT << method);
int i;
int gothost = 0;
const char *remotehost = NULL;
for (i = 0; i < a->nelts; ++i) {
if (!(mmask & ap[i].limited)) {
continue;
}
switch (ap[i].type) {
case T_ENV:
if (apr_table_get(r->subprocess_env, ap[i].x.from)) {
return 1;
}
break;
case T_NENV:
if (!apr_table_get(r->subprocess_env, ap[i].x.from)) {
return 1;
}
break;
case T_ALL:
return 1;
case T_IP:
if (apr_ipsubnet_test(ap[i].x.ip, r->useragent_addr)) {
return 1;
}
break;
case T_HOST:
if (!gothost) {
int remotehost_is_ip;
remotehost = ap_get_remote_host(r->connection,
r->per_dir_config,
REMOTE_DOUBLE_REV,
&remotehost_is_ip);
if ((remotehost == NULL) || remotehost_is_ip) {
gothost = 1;
}
else {
gothost = 2;
}
}
if ((gothost == 2) && in_domain(ap[i].x.from, remotehost)) {
return 1;
}
break;
case T_FAIL:
/* do nothing? */
break;
}
}
return 0;
}
static int access_compat_ap_satisfies(request_rec *r)
{
access_compat_dir_conf *conf = (access_compat_dir_conf *)
ap_get_module_config(r->per_dir_config, &access_compat_module);
return conf->satisfy[r->method_number];
}
static int check_dir_access(request_rec *r)
{
int method = r->method_number;
int ret = OK;
access_compat_dir_conf *a = (access_compat_dir_conf *)
ap_get_module_config(r->per_dir_config, &access_compat_module);
if (a->order[method] == ALLOW_THEN_DENY) {
ret = HTTP_FORBIDDEN;
if (find_allowdeny(r, a->allows, method)) {
ret = OK;
}
if (find_allowdeny(r, a->denys, method)) {
ret = HTTP_FORBIDDEN;
}
}
else if (a->order[method] == DENY_THEN_ALLOW) {
if (find_allowdeny(r, a->denys, method)) {
ret = HTTP_FORBIDDEN;
}
if (find_allowdeny(r, a->allows, method)) {
ret = OK;
}
}
else {
if (find_allowdeny(r, a->allows, method)
&& !find_allowdeny(r, a->denys, method)) {
ret = OK;
}
else {
ret = HTTP_FORBIDDEN;
}
}
if (ret == HTTP_FORBIDDEN) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01797)
"client denied by server configuration: %s%s",
r->filename ? "" : "uri ",
r->filename ? r->filename : r->uri);
}
return ret;
}
static void register_hooks(apr_pool_t *p)
{
APR_REGISTER_OPTIONAL_FN(access_compat_ap_satisfies);
/* This can be access checker since we don't require r->user to be set. */
ap_hook_check_access(check_dir_access, NULL, NULL, APR_HOOK_MIDDLE,
AP_AUTH_INTERNAL_PER_CONF);
}
AP_DECLARE_MODULE(access_compat) =
{
STANDARD20_MODULE_STUFF,
create_access_compat_dir_config, /* dir config creater */
NULL, /* dir merger --- default is to override */
NULL, /* server config */
NULL, /* merge server config */
access_compat_cmds,
register_hooks /* register hooks */
};
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