mod_authn_dbm.c

/* 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.

 */



/*

 * http_auth: authentication

 *

 * Rob McCool & Brian Behlendorf.

 *

 * Adapted to Apache by rst.

 *

 */



#define APR_WANT_STRFUNC

#include "apr_want.h"

#include "apr_strings.h"

#include "apr_dbm.h"

#include "apr_md5.h"        /* for apr_password_validate */



#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"   /* for ap_hook_(check_user_id | auth_checker)*/



#include "mod_auth.h"



typedef struct {

    char *pwfile;

    char *dbmtype;

} authn_dbm_config_rec;



static void *create_authn_dbm_dir_config(apr_pool_t *p, char *d)

{

    authn_dbm_config_rec *conf = apr_palloc(p, sizeof(*conf));



    conf->pwfile = NULL;

    conf->dbmtype = "default";



    return conf;

}



static const char *set_dbm_type(cmd_parms *cmd,

                                void *dir_config,

                                const char *arg)

{

    authn_dbm_config_rec *conf = dir_config;



    conf->dbmtype = apr_pstrdup(cmd->pool, arg);

    return NULL;

}



static const command_rec authn_dbm_cmds[] =

{

    AP_INIT_TAKE1("AuthDBMUserFile", ap_set_file_slot,

     (void *)APR_OFFSETOF(authn_dbm_config_rec, pwfile),

     OR_AUTHCFG, "dbm database file containing user IDs and passwords"),

    AP_INIT_TAKE1("AuthDBMType", set_dbm_type,

     NULL,

     OR_AUTHCFG, "what type of DBM file the user file is"),

    {NULL}

};



module AP_MODULE_DECLARE_DATA authn_dbm_module;



static apr_status_t fetch_dbm_value(const char *dbmtype, const char *dbmfile,

                                    const char *user, char **value,

                                    apr_pool_t *pool)

{

    apr_dbm_t *f;

    apr_datum_t key, val;

    apr_status_t rv;



    rv = apr_dbm_open_ex(&f, dbmtype, dbmfile, APR_DBM_READONLY,

                         APR_OS_DEFAULT, pool);



    if (rv != APR_SUCCESS) {

        return rv;

    }



    key.dptr = (char*)user;

#ifndef NETSCAPE_DBM_COMPAT

    key.dsize = strlen(key.dptr);

#else

    key.dsize = strlen(key.dptr) + 1;

#endif



    *value = NULL;



    if (apr_dbm_fetch(f, key, &val) == APR_SUCCESS && val.dptr) {

        *value = apr_pstrmemdup(pool, val.dptr, val.dsize);

    }



    apr_dbm_close(f);



    return rv;

}



static authn_status check_dbm_pw(request_rec *r, const char *user,

                                 const char *password)

{

    authn_dbm_config_rec *conf = ap_get_module_config(r->per_dir_config,

                                                      &authn_dbm_module);

    apr_status_t rv;

    char *dbm_password;

    char *colon_pw;



    rv = fetch_dbm_value(conf->dbmtype, conf->pwfile, user, &dbm_password,

                         r->pool);



    if (rv != APR_SUCCESS) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,

                      "could not open dbm (type %s) auth file: %s",

                      conf->dbmtype, conf->pwfile);

        return AUTH_GENERAL_ERROR;

    }



    if (!dbm_password) {

        return AUTH_USER_NOT_FOUND;

    }



    colon_pw = ap_strchr(dbm_password, ':');

    if (colon_pw) {

        *colon_pw = '\0';

    }



    rv = apr_password_validate(password, dbm_password);



    if (rv != APR_SUCCESS) {

        return AUTH_DENIED;

    }



    return AUTH_GRANTED;

}



static authn_status get_dbm_realm_hash(request_rec *r, const char *user,

                                       const char *realm, char **rethash)

{

    authn_dbm_config_rec *conf = ap_get_module_config(r->per_dir_config,

                                                      &authn_dbm_module);

    apr_status_t rv;

    char *dbm_hash;

    char *colon_hash;



    rv = fetch_dbm_value(conf->dbmtype, conf->pwfile,

                         apr_pstrcat(r->pool, user, ":", realm, NULL),

                         &dbm_hash, r->pool);



    if (rv != APR_SUCCESS) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,

                      "Could not open dbm (type %s) hash file: %s",

                      conf->dbmtype, conf->pwfile);

        return AUTH_GENERAL_ERROR;

    }



    if (!dbm_hash) {

        return AUTH_USER_NOT_FOUND;

    }



    colon_hash = ap_strchr(dbm_hash, ':');

    if (colon_hash) {

        *colon_hash = '\0';

    }



    *rethash = dbm_hash;



    return AUTH_USER_FOUND;

}



static const authn_provider authn_dbm_provider =

{

    &check_dbm_pw,

    &get_dbm_realm_hash

};



static void register_hooks(apr_pool_t *p)

{

    ap_register_provider(p, AUTHN_PROVIDER_GROUP, "dbm", "0",

                         &authn_dbm_provider);

}



module AP_MODULE_DECLARE_DATA authn_dbm_module =

{

    STANDARD20_MODULE_STUFF,

    create_authn_dbm_dir_config, /* dir config creater */

    NULL,                        /* dir merger --- default is to override */

    NULL,                        /* server config */

    NULL,                        /* merge server config */

    authn_dbm_cmds,              /* command apr_table_t */

    register_hooks               /* register hooks */

};

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