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-
- /* ====================================================================
- * Copyright (c) 1995 The Apache Group. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the Apache Group
- * for use in the Apache HTTP server project (http://www.apache.org/)."
- *
- * 4. The names "Apache Server" and "Apache Group" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission.
- *
- * 5. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the Apache Group
- * for use in the Apache HTTP server project (http://www.apache.org/)."
- *
- * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE APACHE GROUP OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Group and was originally based
- * on public domain software written at the National Center for
- * Supercomputing Applications, University of Illinois, Urbana-Champaign.
- * For more information on the Apache Group and the Apache HTTP server
- * project, please see <http://www.apache.org/>.
- *
- */
-
-
- /*
- * Security options etc.
- *
- * Module derived from code originally written by Rob McCool
- *
- */
-
- #include "httpd.h"
- #include "http_core.h"
- #include "http_config.h"
- #include "http_log.h"
-
- typedef struct {
- char *from;
- int limited;
- } 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];
- array_header *allows;
- array_header *denys;
- } access_dir_conf;
-
- module access_module;
-
- void *create_access_dir_config (pool *p, char *dummy)
- {
- access_dir_conf *conf =
- (access_dir_conf *)pcalloc(p, sizeof(access_dir_conf));
- int i;
-
- for (i = 0; i < METHODS; ++i) conf->order[i] = DENY_THEN_ALLOW;
- conf->allows = make_array (p, 1, sizeof (allowdeny));
- conf->denys = make_array (p, 1, sizeof (allowdeny));
-
- return (void *)conf;
- }
-
- char *order (cmd_parms *cmd, void *dv, char *arg)
- {
- access_dir_conf *d = (access_dir_conf *)dv;
- int i, order;
-
- if (!strcasecmp (arg, "allow,deny")) order = ALLOW_THEN_DENY;
- else if (!strcasecmp (arg, "deny,allow")) order = DENY_THEN_ALLOW;
- else if (!strcasecmp (arg, "mutual-failure")) order = MUTUAL_FAILURE;
- else return "unknown order";
-
- for (i = 0; i < METHODS; ++i)
- if (cmd->limited & (1 << i))
- d->order[i] = order;
-
- return NULL;
- }
-
- char *allow_cmd (cmd_parms *cmd, void *dv, char *from, char *where)
- {
- access_dir_conf *d = (access_dir_conf *)dv;
- allowdeny *a;
-
- if (strcasecmp (from, "from"))
- return "allow and deny must be followed by 'from'";
-
- a = (allowdeny *)push_array (cmd->info ? d->allows : d->denys);
- a->from = pstrdup (cmd->pool, where);
- a->limited = cmd->limited;
- return NULL;
- }
-
- static char its_an_allow;
-
- command_rec access_cmds[] = {
- { "order", order, NULL, OR_LIMIT, TAKE1,
- "'allow,deny', 'deny,allow', or 'mutual-failure'" },
- { "allow", allow_cmd, &its_an_allow, OR_LIMIT, ITERATE2,
- "'from' followed by hostnames or IP-address wildcards" },
- { "deny", allow_cmd, NULL, OR_LIMIT, ITERATE2,
- "'from' followed by hostnames or IP-address wildcards" },
- {NULL}
- };
-
- int in_domain(const char *domain, const char *what) {
- int dl=strlen(domain);
- int wl=strlen(what);
-
- if((wl-dl) >= 0) {
- if (strcmp(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;
- }
-
- int in_ip(char *domain, char *what) {
-
- /* Check a similar screw case to the one checked above ---
- * "allow from 204.26.2" shouldn't let in people from 204.26.23
- */
-
- int l = strlen(domain);
- if (strncmp(domain,what,l) != 0) return 0;
- if (domain[l - 1] == '.') return 1;
- return (what[l] == '\0' || what[l] == '.');
- }
-
- int find_allowdeny (request_rec *r, array_header *a, int method)
- {
- allowdeny *ap = (allowdeny *)a->elts;
- int mmask = (1 << method);
- int i, gothost=0;
- const char *remotehost=NULL;
-
- for (i = 0; i < a->nelts; ++i) {
- if (!(mmask & ap[i].limited))
- continue;
- if (!strcmp (ap[i].from, "all"))
- return 1;
- if (!gothost)
- {
- remotehost = get_remote_host(r->connection, r->per_dir_config,
- REMOTE_HOST);
- gothost = 1;
- }
- if (remotehost != NULL && isalpha(remotehost[0]))
- if (in_domain(ap[i].from, remotehost))
- return 1;
- if (in_ip (ap[i].from, r->connection->remote_ip))
- return 1;
- }
-
- return 0;
- }
-
- int check_dir_access (request_rec *r)
- {
- int method = r->method_number;
- access_dir_conf *a =
- (access_dir_conf *)
- get_module_config (r->per_dir_config, &access_module);
- int ret = OK;
-
- if (a->order[method] == ALLOW_THEN_DENY) {
- ret = FORBIDDEN;
- if (find_allowdeny (r, a->allows, method))
- ret = OK;
- if (find_allowdeny (r, a->denys, method))
- ret = FORBIDDEN;
- } else if (a->order[method] == DENY_THEN_ALLOW) {
- if (find_allowdeny (r, a->denys, method))
- ret = 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 = FORBIDDEN;
- }
-
- if (ret == FORBIDDEN)
- log_reason ("Client denied by server configuration", r->filename, r);
-
- return ret;
- }
-
-
-
- module access_module = {
- STANDARD_MODULE_STUFF,
- NULL, /* initializer */
- create_access_dir_config, /* dir config creater */
- NULL, /* dir merger --- default is to override */
- NULL, /* server config */
- NULL, /* merge server config */
- access_cmds,
- NULL, /* handlers */
- NULL, /* filename translation */
- NULL, /* check_user_id */
- NULL, /* check auth */
- check_dir_access, /* check access */
- NULL, /* type_checker */
- NULL, /* fixups */
- NULL /* logger */
- };
-