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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.
*/
/* This module is triggered by an
*
* AuthGroupFile standard /path/to/file
*
* and the presense of a
*
* require group <list-of-groups>
*
* In an applicable limit/directory block for that method.
*
* If there are no AuthGroupFile directives valid for
* the request; we DECLINED.
*
* If the AuthGroupFile is defined; but somehow not
* accessible: we SERVER_ERROR (was DECLINED).
*
* If there are no 'require ' directives defined for
* this request then we DECLINED (was OK).
*
* If there are no 'require ' directives valid for
* this request method then we DECLINED. (was OK)
*
* If there are any 'require group' blocks and we
* are not in any group - we HTTP_UNAUTHORIZE
*
*/
#include "apr_strings.h"
#include "apr_lib.h" /* apr_isspace */
#include "ap_config.h"
#include "ap_provider.h"
#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_log.h"
#include "http_protocol.h"
#include "http_request.h"
#include "util_varbuf.h"
#include "mod_auth.h"
#include "mod_authz_owner.h"
typedef struct {
char *groupfile;
} authz_groupfile_config_rec;
static void *create_authz_groupfile_dir_config(apr_pool_t *p, char *d)
{
authz_groupfile_config_rec *conf = apr_palloc(p, sizeof(*conf));
conf->groupfile = NULL;
return conf;
}
static const command_rec authz_groupfile_cmds[] =
{
AP_INIT_TAKE1("AuthGroupFile", ap_set_file_slot,
(void *)APR_OFFSETOF(authz_groupfile_config_rec, groupfile),
OR_AUTHCFG,
"text file containing group names and member user IDs"),
{NULL}
};
module AP_MODULE_DECLARE_DATA authz_groupfile_module;
#define VARBUF_INIT_LEN 512
#define VARBUF_MAX_LEN (16*1024*1024)
static apr_status_t groups_for_user(apr_pool_t *p, char *user, char *grpfile,
apr_table_t ** out)
{
ap_configfile_t *f;
apr_table_t *grps = apr_table_make(p, 15);
apr_pool_t *sp;
struct ap_varbuf vb;
const char *group_name, *ll, *w;
apr_status_t status;
apr_size_t group_len;
if ((status = ap_pcfg_openfile(&f, p, grpfile)) != APR_SUCCESS) {
return status ;
}
apr_pool_create(&sp, p);
ap_varbuf_init(p, &vb, VARBUF_INIT_LEN);
while (!(ap_varbuf_cfg_getline(&vb, f, VARBUF_MAX_LEN))) {
if ((vb.buf[0] == '#') || (!vb.buf[0])) {
continue;
}
ll = vb.buf;
apr_pool_clear(sp);
group_name = ap_getword(sp, &ll, ':');
group_len = strlen(group_name);
while (group_len && apr_isspace(*(group_name + group_len - 1))) {
--group_len;
}
while (ll[0]) {
w = ap_getword_conf(sp, &ll);
if (!strcmp(w, user)) {
apr_table_setn(grps, apr_pstrmemdup(p, group_name, group_len),
"in");
break;
}
}
}
ap_cfg_closefile(f);
apr_pool_destroy(sp);
ap_varbuf_free(&vb);
*out = grps;
return APR_SUCCESS;
}
static authz_status group_check_authorization(request_rec *r,
const char *require_args,
const void *parsed_require_args)
{
authz_groupfile_config_rec *conf = ap_get_module_config(r->per_dir_config,
&authz_groupfile_module);
char *user = r->user;
const char *err = NULL;
const ap_expr_info_t *expr = parsed_require_args;
const char *require;
const char *t, *w;
apr_table_t *grpstatus = NULL;
apr_status_t status;
if (!user) {
return AUTHZ_DENIED_NO_USER;
}
/* If there is no group file - then we are not
* configured. So decline.
*/
if (!(conf->groupfile)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01664)
"No group file was specified in the configuration");
return AUTHZ_DENIED;
}
status = groups_for_user(r->pool, user, conf->groupfile,
&grpstatus);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01665)
"Could not open group file: %s",
conf->groupfile);
return AUTHZ_DENIED;
}
if (apr_is_empty_table(grpstatus)) {
/* no groups available, so exit immediately */
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01666)
"Authorization of user %s to access %s failed, reason: "
"user doesn't appear in group file (%s).",
r->user, r->uri, conf->groupfile);
return AUTHZ_DENIED;
}
require = ap_expr_str_exec(r, expr, &err);
if (err) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02592)
"authz_groupfile authorize: require group: Can't "
"evaluate require expression: %s", err);
return AUTHZ_DENIED;
}
t = require;
while ((w = ap_getword_conf(r->pool, &t)) && w[0]) {
if (apr_table_get(grpstatus, w)) {
return AUTHZ_GRANTED;
}
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01667)
"Authorization of user %s to access %s failed, reason: "
"user is not part of the 'require'ed group(s).",
r->user, r->uri);
return AUTHZ_DENIED;
}
static APR_OPTIONAL_FN_TYPE(authz_owner_get_file_group) *authz_owner_get_file_group;
static authz_status filegroup_check_authorization(request_rec *r,
const char *require_args,
const void *parsed_require_args)
{
authz_groupfile_config_rec *conf = ap_get_module_config(r->per_dir_config,
&authz_groupfile_module);
char *user = r->user;
apr_table_t *grpstatus = NULL;
apr_status_t status;
const char *filegroup = NULL;
if (!user) {
return AUTHZ_DENIED_NO_USER;
}
/* If there is no group file - then we are not
* configured. So decline.
*/
if (!(conf->groupfile)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01668)
"No group file was specified in the configuration");
return AUTHZ_DENIED;
}
status = groups_for_user(r->pool, user, conf->groupfile,
&grpstatus);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01669)
"Could not open group file: %s",
conf->groupfile);
return AUTHZ_DENIED;
}
if (apr_is_empty_table(grpstatus)) {
/* no groups available, so exit immediately */
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01670)
"Authorization of user %s to access %s failed, reason: "
"user doesn't appear in group file (%s).",
r->user, r->uri, conf->groupfile);
return AUTHZ_DENIED;
}
filegroup = authz_owner_get_file_group(r);
if (filegroup) {
if (apr_table_get(grpstatus, filegroup)) {
return AUTHZ_GRANTED;
}
}
else {
/* No need to emit a error log entry because the call
to authz_owner_get_file_group already did it
for us.
*/
return AUTHZ_DENIED;
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01671)
"Authorization of user %s to access %s failed, reason: "
"user is not part of the 'require'ed file group.",
r->user, r->uri);
return AUTHZ_DENIED;
}
static const char *groupfile_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_group_provider =
{
&group_check_authorization,
&groupfile_parse_config,
};
static const authz_provider authz_filegroup_provider =
{
&filegroup_check_authorization,
NULL,
};
static void authz_groupfile_getfns(void)
{
authz_owner_get_file_group = APR_RETRIEVE_OPTIONAL_FN(authz_owner_get_file_group);
}
static void register_hooks(apr_pool_t *p)
{
ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "group",
AUTHZ_PROVIDER_VERSION,
&authz_group_provider,
AP_AUTH_INTERNAL_PER_CONF);
ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "file-group",
AUTHZ_PROVIDER_VERSION,
&authz_filegroup_provider,
AP_AUTH_INTERNAL_PER_CONF);
ap_hook_optional_fn_retrieve(authz_groupfile_getfns, NULL, NULL, APR_HOOK_MIDDLE);
}
AP_DECLARE_MODULE(authz_groupfile) =
{
STANDARD20_MODULE_STUFF,
create_authz_groupfile_dir_config,/* dir config creater */
NULL, /* dir merger -- default is to override */
NULL, /* server config */
NULL, /* merge server config */
authz_groupfile_cmds, /* command apr_table_t */
register_hooks /* register hooks */
};
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