232 lines
6.7 KiB
C
232 lines
6.7 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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/*
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* http_auth: authentication
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*
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* Rob McCool & Brian Behlendorf.
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*
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* Adapted to Apache by rst.
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*
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*/
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#define APR_WANT_STRFUNC
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#include "apr_want.h"
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#include "apr_strings.h"
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#include "apr_dbm.h"
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#include "apr_md5.h" /* for apr_password_validate */
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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" /* for ap_hook_(check_user_id | auth_checker)*/
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#include "mod_auth.h"
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#include "apr_version.h"
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#if !APR_VERSION_AT_LEAST(2,0,0)
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#include "apu_version.h"
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#endif
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static APR_OPTIONAL_FN_TYPE(ap_authn_cache_store) *authn_cache_store = NULL;
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#define AUTHN_CACHE_STORE(r,user,realm,data) \
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if (authn_cache_store != NULL) \
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authn_cache_store((r), "dbm", (user), (realm), (data))
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typedef struct {
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const char *pwfile;
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const char *dbmtype;
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} authn_dbm_config_rec;
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static void *create_authn_dbm_dir_config(apr_pool_t *p, char *d)
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{
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authn_dbm_config_rec *conf = apr_palloc(p, sizeof(*conf));
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conf->pwfile = NULL;
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conf->dbmtype = "default";
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return conf;
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}
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static const command_rec authn_dbm_cmds[] =
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{
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AP_INIT_TAKE1("AuthDBMUserFile", ap_set_file_slot,
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(void *)APR_OFFSETOF(authn_dbm_config_rec, pwfile),
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OR_AUTHCFG, "dbm database file containing user IDs and passwords"),
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AP_INIT_TAKE1("AuthDBMType", ap_set_string_slot,
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(void *)APR_OFFSETOF(authn_dbm_config_rec, dbmtype),
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OR_AUTHCFG, "what type of DBM file the user file is"),
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{NULL}
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};
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module AP_MODULE_DECLARE_DATA authn_dbm_module;
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static apr_status_t fetch_dbm_value(request_rec *r, const char *dbmtype,
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const char *dbmfile,
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const char *user, char **value)
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{
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#if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 7)
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const apr_dbm_driver_t *driver;
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const apu_err_t *err;
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#endif
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apr_dbm_t *f;
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apr_datum_t key, val;
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apr_status_t rv;
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#if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 7)
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rv = apr_dbm_get_driver(&driver, dbmtype, &err, r->pool);
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if (rv != APR_SUCCESS) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(10284)
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"could not load '%s' dbm library: %s",
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err->reason, err->msg);
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return rv;
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}
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rv = apr_dbm_open2(&f, driver, dbmfile, APR_DBM_READONLY,
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APR_OS_DEFAULT, r->pool);
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#else
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rv = apr_dbm_open_ex(&f, dbmtype, dbmfile, APR_DBM_READONLY,
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APR_OS_DEFAULT, r->pool);
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#endif
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if (rv != APR_SUCCESS) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(10285)
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"could not open dbm (type %s) file: %s",
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dbmtype, dbmfile);
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return rv;
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}
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key.dptr = (char*)user;
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#ifndef NETSCAPE_DBM_COMPAT
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key.dsize = strlen(key.dptr);
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#else
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key.dsize = strlen(key.dptr) + 1;
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#endif
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*value = NULL;
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if (apr_dbm_fetch(f, key, &val) == APR_SUCCESS && val.dptr) {
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*value = apr_pstrmemdup(r->pool, val.dptr, val.dsize);
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}
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apr_dbm_close(f);
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/* NOT FOUND is not an error case; this is indicated by a NULL result.
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* Treat all NULL lookup/error results as success for the simple case
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* of auth credential lookup, these are DECLINED in both cases.
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*/
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return APR_SUCCESS;
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}
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static authn_status check_dbm_pw(request_rec *r, const char *user,
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const char *password)
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{
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authn_dbm_config_rec *conf = ap_get_module_config(r->per_dir_config,
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&authn_dbm_module);
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apr_status_t rv;
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char *dbm_password;
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char *colon_pw;
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rv = fetch_dbm_value(r, conf->dbmtype, conf->pwfile, user, &dbm_password);
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if (rv != APR_SUCCESS) {
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return AUTH_GENERAL_ERROR;
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}
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if (!dbm_password) {
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return AUTH_USER_NOT_FOUND;
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}
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colon_pw = ap_strchr(dbm_password, ':');
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if (colon_pw) {
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*colon_pw = '\0';
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}
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AUTHN_CACHE_STORE(r, user, NULL, dbm_password);
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rv = apr_password_validate(password, dbm_password);
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if (rv != APR_SUCCESS) {
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return AUTH_DENIED;
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}
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return AUTH_GRANTED;
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}
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static authn_status get_dbm_realm_hash(request_rec *r, const char *user,
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const char *realm, char **rethash)
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{
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authn_dbm_config_rec *conf = ap_get_module_config(r->per_dir_config,
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&authn_dbm_module);
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apr_status_t rv;
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char *dbm_hash;
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char *colon_hash;
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rv = fetch_dbm_value(r, conf->dbmtype, conf->pwfile,
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apr_pstrcat(r->pool, user, ":", realm, NULL),
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&dbm_hash);
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if (rv != APR_SUCCESS) {
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return AUTH_GENERAL_ERROR;
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}
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if (!dbm_hash) {
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return AUTH_USER_NOT_FOUND;
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}
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colon_hash = ap_strchr(dbm_hash, ':');
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if (colon_hash) {
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*colon_hash = '\0';
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}
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*rethash = dbm_hash;
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AUTHN_CACHE_STORE(r, user, realm, dbm_hash);
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return AUTH_USER_FOUND;
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}
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static const authn_provider authn_dbm_provider =
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{
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&check_dbm_pw,
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&get_dbm_realm_hash,
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};
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static void opt_retr(void)
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{
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authn_cache_store = APR_RETRIEVE_OPTIONAL_FN(ap_authn_cache_store);
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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, AUTHN_PROVIDER_GROUP, "dbm",
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AUTHN_PROVIDER_VERSION,
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&authn_dbm_provider, AP_AUTH_INTERNAL_PER_CONF);
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ap_hook_optional_fn_retrieve(opt_retr, NULL, NULL, APR_HOOK_MIDDLE);
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}
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AP_DECLARE_MODULE(authn_dbm) =
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{
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STANDARD20_MODULE_STUFF,
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create_authn_dbm_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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authn_dbm_cmds, /* command apr_table_t */
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register_hooks /* register hooks */
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};
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