mod_authz_host.c revision 5b2433f52bc66c1b06effbca93fe032a4bb881c8
/* 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 "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
typedef struct {
int dummy; /* just here to stop compiler warnings for now. */
} authz_host_dir_conf;
module AP_MODULE_DECLARE_DATA authz_host_module;
static void *create_authz_host_dir_config(apr_pool_t *p, char *dummy)
{
authz_host_dir_conf *conf =
(authz_host_dir_conf *)apr_pcalloc(p, sizeof(authz_host_dir_conf));
return (void *)conf;
}
static const command_rec authz_host_cmds[] =
{
{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 authz_status env_check_authorization(request_rec *r,
const char *require_line,
const void *parsed_require_line)
{
const char *t, *w;
/* The 'env' provider will allow the configuration to specify a list of
env variables to check rather than a single variable. This is different
from the previous host based syntax. */
t = require_line;
while ((w = ap_getword_conf(r->pool, &t)) && w[0]) {
if (apr_table_get(r->subprocess_env, w)) {
return AUTHZ_GRANTED;
}
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"access to %s failed, reason: env variable list does not meet "
"'require'ments for user '%s' to be allowed access",
r->uri, r->user);
return AUTHZ_DENIED;
}
static authz_status ip_check_authorization(request_rec *r,
const char *require_line,
const void *parsed_require_line)
{
const char *t, *w;
/* 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(r->pool, &t)) && w[0]) {
char *where = apr_pstrdup(r->pool, w);
char *s;
char msgbuf[120];
apr_ipsubnet_t *ip;
apr_status_t rv;
int got_ip = 0;
if ((s = ap_strchr(where, '/'))) {
*s++ = '\0';
rv = apr_ipsubnet_create(&ip, where, s, r->pool);
if(APR_STATUS_IS_EINVAL(rv)) {
/* looked nothing like an IP address */
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"an ip address 'require' list appears to be invalid ");
}
else if (rv != APR_SUCCESS) {
apr_strerror(rv, msgbuf, sizeof msgbuf);
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"an ip address 'require' list appears to be invalid; %s ",
msgbuf);
}
else
got_ip = 1;
}
else if (!APR_STATUS_IS_EINVAL(rv = apr_ipsubnet_create(&ip, where,
NULL, r->pool))) {
if (rv != APR_SUCCESS) {
apr_strerror(rv, msgbuf, sizeof msgbuf);
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"an ip address 'require' list appears to be invalid; %s ",
msgbuf);
}
else
got_ip = 1;
}
if (got_ip && apr_ipsubnet_test(ip, r->connection->remote_addr)) {
return AUTHZ_GRANTED;
}
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"access to %s failed, reason: ip address list does not meet "
"'require'ments for user '%s' to be allowed access",
r->uri, r->user);
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_remote_host(r->connection,
r->per_dir_config,
REMOTE_DOUBLE_REV,
&remotehost_is_ip);
if ((remotehost == NULL) || remotehost_is_ip) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"access to %s failed, reason: unable to get the "
"remote host name", r->uri);
}
else {
/* 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_line;
while ((w = ap_getword_conf(r->pool, &t)) && w[0]) {
if (in_domain(w, remotehost)) {
return AUTHZ_GRANTED;
}
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"access to %s failed, reason: host name list does not meet "
"'require'ments for user '%s' to be allowed access",
r->uri, r->user);
}
return AUTHZ_DENIED;
}
static authz_status all_check_authorization(request_rec *r,
const char *require_line,
const void *parsed_require_line)
{
if (parsed_require_line) {
return AUTHZ_GRANTED;
}
return AUTHZ_DENIED;
}
static const char *all_parse_config(cmd_parms *cmd, const char *require_line,
const void **parsed_require_line)
{
/*
* If the argument to the 'all' provider is 'granted' then just let
* everybody in. This would be equivalent to the previous syntax of
* 'allow from all'. If the argument is 'denied' we reject everbody,
* which is equivalent to 'deny from all'.
*/
if (strcasecmp(require_line, "granted") == 0) {
*parsed_require_line = (void *)1;
return NULL;
}
else if (strcasecmp(require_line, "denied") == 0) {
/* *parsed_require_line is already NULL */
return NULL;
}
else {
return "Argument for 'Require all' must be 'granted' or 'denied'";
}
}
static authz_status method_check_authorization(request_rec *r,
const char *require_line,
const void *parsed_require_line)
{
const apr_int64_t *allowed = parsed_require_line;
if (*allowed & (AP_METHOD_BIT << r->method_number))
return AUTHZ_GRANTED;
else
return AUTHZ_DENIED;
}
static const char *method_parse_config(cmd_parms *cmd, const char *require_line,
const void **parsed_require_line)
{
const char *w, *t;
apr_int64_t *allowed = apr_pcalloc(cmd->pool, sizeof(apr_int64_t));
t = require_line;
while ((w = ap_getword_conf(cmd->temp_pool, &t)) && w[0]) {
int m = ap_method_number_of(w);
if (m == M_INVALID) {
return apr_pstrcat(cmd->pool, "Invalid Method '", w, "'", NULL);
}
*allowed |= (AP_METHOD_BIT << m);
}
*parsed_require_line = allowed;
return NULL;
}
static const authz_provider authz_env_provider =
{
&env_check_authorization,
NULL,
};
static const authz_provider authz_ip_provider =
{
&ip_check_authorization,
NULL,
};
static const authz_provider authz_host_provider =
{
&host_check_authorization,
NULL,
};
static const authz_provider authz_all_provider =
{
&all_check_authorization,
&all_parse_config,
};
static const authz_provider authz_method_provider =
{
&method_check_authorization,
&method_parse_config,
};
static void register_hooks(apr_pool_t *p)
{
ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "env",
AUTHZ_PROVIDER_VERSION,
&authz_env_provider, AP_AUTH_INTERNAL_PER_CONF);
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, "all",
AUTHZ_PROVIDER_VERSION,
&authz_all_provider, AP_AUTH_INTERNAL_PER_CONF);
ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "method",
AUTHZ_PROVIDER_VERSION,
&authz_method_provider, AP_AUTH_INTERNAL_PER_CONF);
}
AP_DECLARE_MODULE(authz_host) =
{
STANDARD20_MODULE_STUFF,
create_authz_host_dir_config, /* dir config creater */
NULL, /* dir merger --- default is to override */
NULL, /* server config */
NULL, /* merge server config */
authz_host_cmds,
register_hooks /* register hooks */
};