334 lines
10 KiB
C
334 lines
10 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* This module is triggered by an
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*
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* AuthGroupFile standard /path/to/file
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*
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* and the presence of a
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*
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* require group <list-of-groups>
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*
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* In an applicable limit/directory block for that method.
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*
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* If there are no AuthGroupFile directives valid for
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* the request; we DECLINED.
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*
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* If the AuthGroupFile is defined; but somehow not
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* accessible: we SERVER_ERROR (was DECLINED).
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*
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* If there are no 'require ' directives defined for
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* this request then we DECLINED (was OK).
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*
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* If there are no 'require ' directives valid for
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* this request method then we DECLINED. (was OK)
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*
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* If there are any 'require group' blocks and we
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* are not in any group - we HTTP_UNAUTHORIZE
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*
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*/
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#include "apr_strings.h"
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#include "apr_lib.h" /* apr_isspace */
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#include "ap_config.h"
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#include "ap_provider.h"
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#include "httpd.h"
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#include "http_config.h"
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#include "http_core.h"
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#include "http_log.h"
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#include "http_protocol.h"
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#include "http_request.h"
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#include "util_varbuf.h"
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#include "mod_auth.h"
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#include "mod_authz_owner.h"
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typedef struct {
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char *groupfile;
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} authz_groupfile_config_rec;
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static void *create_authz_groupfile_dir_config(apr_pool_t *p, char *d)
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{
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authz_groupfile_config_rec *conf = apr_palloc(p, sizeof(*conf));
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conf->groupfile = NULL;
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return conf;
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}
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static const command_rec authz_groupfile_cmds[] =
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{
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AP_INIT_TAKE1("AuthGroupFile", ap_set_file_slot,
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(void *)APR_OFFSETOF(authz_groupfile_config_rec, groupfile),
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OR_AUTHCFG,
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"text file containing group names and member user IDs"),
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{NULL}
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};
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module AP_MODULE_DECLARE_DATA authz_groupfile_module;
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#define VARBUF_INIT_LEN 512
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#define VARBUF_MAX_LEN (16*1024*1024)
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static apr_status_t groups_for_user(apr_pool_t *p, char *user, char *grpfile,
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apr_table_t ** out)
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{
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ap_configfile_t *f;
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apr_table_t *grps = apr_table_make(p, 15);
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apr_pool_t *sp;
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struct ap_varbuf vb;
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const char *group_name, *ll, *w;
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apr_status_t status;
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apr_size_t group_len;
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if ((status = ap_pcfg_openfile(&f, p, grpfile)) != APR_SUCCESS) {
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return status ;
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}
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apr_pool_create(&sp, p);
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apr_pool_tag(sp, "authz_groupfile (groups_for_user)");
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ap_varbuf_init(p, &vb, VARBUF_INIT_LEN);
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while (!(ap_varbuf_cfg_getline(&vb, f, VARBUF_MAX_LEN))) {
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if ((vb.buf[0] == '#') || (!vb.buf[0])) {
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continue;
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}
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ll = vb.buf;
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apr_pool_clear(sp);
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group_name = ap_getword(sp, &ll, ':');
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group_len = strlen(group_name);
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while (group_len && apr_isspace(*(group_name + group_len - 1))) {
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--group_len;
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}
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while (ll[0]) {
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w = ap_getword_conf(sp, &ll);
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if (!strcmp(w, user)) {
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apr_table_setn(grps, apr_pstrmemdup(p, group_name, group_len),
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"in");
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break;
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}
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}
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}
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ap_cfg_closefile(f);
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apr_pool_destroy(sp);
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ap_varbuf_free(&vb);
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*out = grps;
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return APR_SUCCESS;
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}
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static authz_status group_check_authorization(request_rec *r,
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const char *require_args,
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const void *parsed_require_args)
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{
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authz_groupfile_config_rec *conf = ap_get_module_config(r->per_dir_config,
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&authz_groupfile_module);
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char *user = r->user;
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const char *err = NULL;
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const ap_expr_info_t *expr = parsed_require_args;
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const char *require;
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const char *t, *w;
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apr_table_t *grpstatus = NULL;
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apr_status_t status;
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if (!user) {
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return AUTHZ_DENIED_NO_USER;
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}
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/* If there is no group file - then we are not
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* configured. So decline.
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*/
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if (!(conf->groupfile)) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01664)
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"No group file was specified in the configuration");
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return AUTHZ_DENIED;
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}
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status = groups_for_user(r->pool, user, conf->groupfile,
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&grpstatus);
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if (status != APR_SUCCESS) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01665)
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"Could not open group file: %s",
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conf->groupfile);
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return AUTHZ_DENIED;
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}
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if (apr_is_empty_table(grpstatus)) {
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/* no groups available, so exit immediately */
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ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(01666)
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"Authorization of user %s to access %s failed, reason: "
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"user doesn't appear in group file (%s).",
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r->user, r->uri, conf->groupfile);
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return AUTHZ_DENIED;
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}
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require = ap_expr_str_exec(r, expr, &err);
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if (err) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02592)
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"authz_groupfile authorize: require group: Can't "
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"evaluate require expression: %s", err);
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return AUTHZ_DENIED;
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}
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t = require;
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while ((w = ap_getword_conf(r->pool, &t)) && w[0]) {
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if (apr_table_get(grpstatus, w)) {
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return AUTHZ_GRANTED;
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}
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}
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ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01667)
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"Authorization of user %s to access %s failed, reason: "
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"user is not part of the 'require'ed group(s).",
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r->user, r->uri);
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return AUTHZ_DENIED;
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}
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static APR_OPTIONAL_FN_TYPE(authz_owner_get_file_group) *authz_owner_get_file_group;
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static authz_status filegroup_check_authorization(request_rec *r,
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const char *require_args,
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const void *parsed_require_args)
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{
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authz_groupfile_config_rec *conf = ap_get_module_config(r->per_dir_config,
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&authz_groupfile_module);
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char *user = r->user;
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apr_table_t *grpstatus = NULL;
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apr_status_t status;
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const char *filegroup = NULL;
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if (!user) {
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return AUTHZ_DENIED_NO_USER;
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}
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/* If there is no group file - then we are not
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* configured. So decline.
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*/
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if (!(conf->groupfile)) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01668)
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"No group file was specified in the configuration");
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return AUTHZ_DENIED;
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}
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status = groups_for_user(r->pool, user, conf->groupfile,
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&grpstatus);
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if (status != APR_SUCCESS) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01669)
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"Could not open group file: %s",
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conf->groupfile);
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return AUTHZ_DENIED;
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}
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if (apr_is_empty_table(grpstatus)) {
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/* no groups available, so exit immediately */
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01670)
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"Authorization of user %s to access %s failed, reason: "
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"user doesn't appear in group file (%s).",
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r->user, r->uri, conf->groupfile);
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return AUTHZ_DENIED;
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}
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filegroup = authz_owner_get_file_group(r);
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if (filegroup) {
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if (apr_table_get(grpstatus, filegroup)) {
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return AUTHZ_GRANTED;
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}
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}
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else {
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/* No need to emit a error log entry because the call
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to authz_owner_get_file_group already did it
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for us.
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*/
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return AUTHZ_DENIED;
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}
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ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01671)
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"Authorization of user %s to access %s failed, reason: "
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"user is not part of the 'require'ed file group.",
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r->user, r->uri);
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return AUTHZ_DENIED;
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}
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static const char *groupfile_parse_config(cmd_parms *cmd, const char *require_line,
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const void **parsed_require_line)
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{
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const char *expr_err = NULL;
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ap_expr_info_t *expr;
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expr = ap_expr_parse_cmd(cmd, require_line, AP_EXPR_FLAG_STRING_RESULT,
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&expr_err, NULL);
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if (expr_err)
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return apr_pstrcat(cmd->temp_pool,
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"Cannot parse expression in require line: ",
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expr_err, NULL);
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*parsed_require_line = expr;
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return NULL;
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}
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static const authz_provider authz_group_provider =
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{
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&group_check_authorization,
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&groupfile_parse_config,
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};
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static const authz_provider authz_filegroup_provider =
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{
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&filegroup_check_authorization,
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NULL,
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};
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static void authz_groupfile_getfns(void)
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{
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authz_owner_get_file_group = APR_RETRIEVE_OPTIONAL_FN(authz_owner_get_file_group);
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}
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static void register_hooks(apr_pool_t *p)
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{
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ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "group",
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AUTHZ_PROVIDER_VERSION,
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&authz_group_provider,
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AP_AUTH_INTERNAL_PER_CONF);
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ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "file-group",
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AUTHZ_PROVIDER_VERSION,
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&authz_filegroup_provider,
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AP_AUTH_INTERNAL_PER_CONF);
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ap_hook_optional_fn_retrieve(authz_groupfile_getfns, NULL, NULL, APR_HOOK_MIDDLE);
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}
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AP_DECLARE_MODULE(authz_groupfile) =
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{
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STANDARD20_MODULE_STUFF,
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create_authz_groupfile_dir_config,/* dir config creater */
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NULL, /* dir merger -- default is to override */
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NULL, /* server config */
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NULL, /* merge server config */
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authz_groupfile_cmds, /* command apr_table_t */
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register_hooks /* register hooks */
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};
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