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DEFINITIONS
This source file includes following definitions.
- get_dbm_entry_as_str
- create_authz_dbm_dir_config
- get_dbm_grp
- dbm_check_auth
- register_hooks
/* 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.
*/
#define APR_WANT_STRFUNC
#include "apr_want.h"
#include "apr_strings.h"
#include "apr_dbm.h"
#include "apr_md5.h"
#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_log.h"
#include "http_protocol.h"
#include "http_request.h" /* for ap_hook_(check_user_id | auth_checker)*/
#include "mod_auth.h"
typedef struct {
char *grpfile;
char *dbmtype;
int authoritative;
} authz_dbm_config_rec;
/* This should go into APR; perhaps with some nice
* caching/locking/flocking of the open dbm file.
*/
static char *get_dbm_entry_as_str(apr_pool_t *pool, apr_dbm_t *f, char *key)
{
apr_datum_t d, q;
q.dptr = key;
#ifndef NETSCAPE_DBM_COMPAT
q.dsize = strlen(q.dptr);
#else
q.dsize = strlen(q.dptr) + 1;
#endif
if (apr_dbm_fetch(f, q, &d) == APR_SUCCESS && d.dptr) {
return apr_pstrmemdup(pool, d.dptr, d.dsize);
}
return NULL;
}
static void *create_authz_dbm_dir_config(apr_pool_t *p, char *d)
{
authz_dbm_config_rec *conf = apr_palloc(p, sizeof(*conf));
conf->grpfile = NULL;
conf->dbmtype = "default";
conf->authoritative = 1; /* fortress is secure by default */
return conf;
}
static const command_rec authz_dbm_cmds[] =
{
AP_INIT_TAKE1("AuthDBMGroupFile", ap_set_file_slot,
(void *)APR_OFFSETOF(authz_dbm_config_rec, grpfile),
OR_AUTHCFG, "database file containing group names and member user IDs"),
AP_INIT_TAKE1("AuthzDBMType", ap_set_string_slot,
(void *)APR_OFFSETOF(authz_dbm_config_rec, dbmtype),
OR_AUTHCFG, "what type of DBM file the group file is"),
AP_INIT_FLAG("AuthzDBMAuthoritative", ap_set_flag_slot,
(void *)APR_OFFSETOF(authz_dbm_config_rec, authoritative),
OR_AUTHCFG, "Set to 'Off' to allow access control to be passed along to "
"lower modules, if the group required is not found or empty, or the user "
" is not in the required groups. (default is On.)"),
{NULL}
};
module AP_MODULE_DECLARE_DATA authz_dbm_module;
/* We do something strange with the group file. If the group file
* contains any : we assume the format is
* key=username value=":"groupname [":"anything here is ignored]
* otherwise we now (0.8.14+) assume that the format is
* key=username value=groupname
* The first allows the password and group files to be the same
* physical DBM file; key=username value=password":"groupname[":"anything]
*
* mark@telescope.org, 22Sep95
*/
static apr_status_t get_dbm_grp(request_rec *r, char *key1, char *key2,
char *dbmgrpfile, char *dbtype,
const char ** out)
{
char *grp_colon, *val;
apr_status_t retval;
apr_dbm_t *f;
retval = apr_dbm_open_ex(&f, dbtype, dbmgrpfile, APR_DBM_READONLY,
APR_OS_DEFAULT, r->pool);
if (retval != APR_SUCCESS) {
return retval;
}
/* Try key2 only if key1 failed */
if (!(val = get_dbm_entry_as_str(r->pool, f, key1))) {
val = get_dbm_entry_as_str(r->pool, f, key2);
}
apr_dbm_close(f);
if (val && (grp_colon = ap_strchr(val, ':')) != NULL) {
char *grp_colon2 = ap_strchr(++grp_colon, ':');
if (grp_colon2) {
*grp_colon2 = '\0';
}
*out = grp_colon;
}
else {
*out = val;
}
return retval;
}
/* Checking ID */
static int dbm_check_auth(request_rec *r)
{
authz_dbm_config_rec *conf = ap_get_module_config(r->per_dir_config,
&authz_dbm_module);
char *user = r->user;
int m = r->method_number;
const apr_array_header_t *reqs_arr = ap_requires(r);
require_line *reqs = reqs_arr ? (require_line *) reqs_arr->elts : NULL;
register int x;
const char *t;
char *w;
int required_group = 0;
const char *filegroup = NULL;
const char *orig_groups = NULL;
char *reason = NULL;
if (!conf->grpfile) {
return DECLINED;
}
if (!reqs_arr) {
return DECLINED;
}
for (x = 0; x < reqs_arr->nelts; x++) {
if (!(reqs[x].method_mask & (AP_METHOD_BIT << m))) {
continue;
}
t = reqs[x].requirement;
w = ap_getword_white(r->pool, &t);
if (!strcasecmp(w, "file-group")) {
filegroup = apr_table_get(r->notes, AUTHZ_GROUP_NOTE);
if (!filegroup) {
/* mod_authz_owner is not present or not
* authoritative. We are just a helper module for testing
* group membership, so we don't care and decline.
*/
continue;
}
}
if (!strcasecmp(w, "group") || filegroup) {
const char *realm = ap_auth_name(r);
const char *groups;
char *v;
/* remember that actually a group is required */
required_group = 1;
/* fetch group data from dbm file only once. */
if (!orig_groups) {
apr_status_t status;
status = get_dbm_grp(r, apr_pstrcat(r->pool, user, ":", realm,
NULL),
user,
conf->grpfile, conf->dbmtype, &groups);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r,
"could not open dbm (type %s) group access "
"file: %s", conf->dbmtype, conf->grpfile);
return HTTP_INTERNAL_SERVER_ERROR;
}
if (groups == NULL) {
/* no groups available, so exit immediately */
reason = apr_psprintf(r->pool,
"user doesn't appear in DBM group "
"file (%s).", conf->grpfile);
break;
}
orig_groups = groups;
}
if (filegroup) {
groups = orig_groups;
while (groups[0]) {
v = ap_getword(r->pool, &groups, ',');
if (!strcmp(v, filegroup)) {
return OK;
}
}
if (conf->authoritative) {
reason = apr_psprintf(r->pool,
"file group '%s' does not match.",
filegroup);
break;
}
/* now forget the filegroup, thus alternatively require'd
groups get a real chance */
filegroup = NULL;
}
else {
while (t[0]) {
w = ap_getword_white(r->pool, &t);
groups = orig_groups;
while (groups[0]) {
v = ap_getword(r->pool, &groups, ',');
if (!strcmp(v, w)) {
return OK;
}
}
}
}
}
}
/* No applicable "require group" for this method seen */
if (!required_group || !conf->authoritative) {
return DECLINED;
}
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"Authorization of user %s to access %s failed, reason: %s",
r->user, r->uri,
reason ? reason : "user is not part of the "
"'require'ed group(s).");
ap_note_auth_failure(r);
return HTTP_UNAUTHORIZED;
}
static void register_hooks(apr_pool_t *p)
{
static const char * const aszPre[]={ "mod_authz_owner.c", NULL };
ap_hook_auth_checker(dbm_check_auth, aszPre, NULL, APR_HOOK_MIDDLE);
}
module AP_MODULE_DECLARE_DATA authz_dbm_module =
{
STANDARD20_MODULE_STUFF,
create_authz_dbm_dir_config, /* dir config creater */
NULL, /* dir merger --- default is to override */
NULL, /* server config */
NULL, /* merge server config */
authz_dbm_cmds, /* command apr_table_t */
register_hooks /* register hooks */
};